* [NET 01/20]: Accept wildcard delimiters in in[46]_pton
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
@ 2006-12-02 14:49 ` Patrick McHardy
2006-12-02 14:49 ` [NETFILTER 02/20]: nf_conntrack: fix NF_CONNTRACK_PROC_COMPAT dependency Patrick McHardy
` (19 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:49 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NET]: Accept wildcard delimiters in in[46]_pton
Accept -1 as delimiter to abort parsing without an error at the first
unknown character. This is needed by the upcoming nf_conntrack SIP
helper, where addresses are delimited by either '\r' or '\n' characters.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit 0166e0457531e1e5260463477c30dd16b81ab606
tree f752c1e10f845935f865bb1670c64d70c2cd2acd
parent 5465ae68b5ec11b2820db3f9b4c6fd94f113da44
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:52 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:52 +0100
include/linux/inet.h | 4 ++--
net/core/utils.c | 10 ++++++----
2 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/include/linux/inet.h b/include/linux/inet.h
index b7c6da7..675a7db 100644
--- a/include/linux/inet.h
+++ b/include/linux/inet.h
@@ -46,7 +46,7 @@ #ifdef __KERNEL__
#include <linux/types.h>
extern __be32 in_aton(const char *str);
-extern int in4_pton(const char *src, int srclen, u8 *dst, char delim, const char **end);
-extern int in6_pton(const char *src, int srclen, u8 *dst, char delim, const char **end);
+extern int in4_pton(const char *src, int srclen, u8 *dst, int delim, const char **end);
+extern int in6_pton(const char *src, int srclen, u8 *dst, int delim, const char **end);
#endif
#endif /* _LINUX_INET_H */
diff --git a/net/core/utils.c b/net/core/utils.c
index d93fe64..6155606 100644
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -88,7 +88,7 @@ #define IN6PTON_DELIM 0x10000000
#define IN6PTON_NULL 0x20000000 /* first/tail */
#define IN6PTON_UNKNOWN 0x40000000
-static inline int digit2bin(char c, char delim)
+static inline int digit2bin(char c, int delim)
{
if (c == delim || c == '\0')
return IN6PTON_DELIM;
@@ -99,7 +99,7 @@ static inline int digit2bin(char c, char
return IN6PTON_UNKNOWN;
}
-static inline int xdigit2bin(char c, char delim)
+static inline int xdigit2bin(char c, int delim)
{
if (c == delim || c == '\0')
return IN6PTON_DELIM;
@@ -113,12 +113,14 @@ static inline int xdigit2bin(char c, cha
return (IN6PTON_XDIGIT | (c - 'a' + 10));
if (c >= 'A' && c <= 'F')
return (IN6PTON_XDIGIT | (c - 'A' + 10));
+ if (delim == -1)
+ return IN6PTON_DELIM;
return IN6PTON_UNKNOWN;
}
int in4_pton(const char *src, int srclen,
u8 *dst,
- char delim, const char **end)
+ int delim, const char **end)
{
const char *s;
u8 *d;
@@ -173,7 +175,7 @@ EXPORT_SYMBOL(in4_pton);
int in6_pton(const char *src, int srclen,
u8 *dst,
- char delim, const char **end)
+ int delim, const char **end)
{
const char *s, *tok = NULL;
u8 *d, *dc = NULL;
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 02/20]: nf_conntrack: fix NF_CONNTRACK_PROC_COMPAT dependency
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
2006-12-02 14:49 ` [NET 01/20]: Accept wildcard delimiters in in[46]_pton Patrick McHardy
@ 2006-12-02 14:49 ` Patrick McHardy
2006-12-02 14:49 ` [NETFILTER 03/20]: nf_conntrack: fix helper structure alignment Patrick McHardy
` (18 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:49 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack: fix NF_CONNTRACK_PROC_COMPAT dependency
NF_CONNTRACK_PROC_COMPAT depends on NF_CONNTRACK_IPV4, not NF_CONNTRACK.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit 66d2cd318d32a8b3a876714f104477ba9aa6b87a
tree c9157c066030213ea7929456f7047fb2c35def9a
parent 0166e0457531e1e5260463477c30dd16b81ab606
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:53 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:53 +0100
net/ipv4/netfilter/Kconfig | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index bc298a3..06fec80 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -21,7 +21,7 @@ config NF_CONNTRACK_IPV4
config NF_CONNTRACK_PROC_COMPAT
bool "proc/sysctl compatibility with old connection tracking"
- depends on NF_CONNTRACK
+ depends on NF_CONNTRACK_IPV4
default y
help
This option enables /proc and sysctl compatibility with the old
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 03/20]: nf_conntrack: fix helper structure alignment
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
2006-12-02 14:49 ` [NET 01/20]: Accept wildcard delimiters in in[46]_pton Patrick McHardy
2006-12-02 14:49 ` [NETFILTER 02/20]: nf_conntrack: fix NF_CONNTRACK_PROC_COMPAT dependency Patrick McHardy
@ 2006-12-02 14:49 ` Patrick McHardy
2006-12-02 14:49 ` [NETFILTER 04/20]: nf_conntrack: endian annotations Patrick McHardy
` (17 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:49 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack: fix helper structure alignment
Adding the alignment to the size doesn't make any sense, what it
should do is align the size of the conntrack structure to the
alignment requirements of the helper structure and return an
aligned pointer in nfct_help().
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit fd155ea4144ef3b1d15705284b9513b42870e363
tree 9af3909df2ab29b89de1fe66ebd20b6d134728c0
parent 66d2cd318d32a8b3a876714f104477ba9aa6b87a
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:54 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:54 +0100
include/net/netfilter/nf_conntrack.h | 1 +
net/netfilter/nf_conntrack_helper.c | 9 +++++----
2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index d0d0e64..b4beb8c 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -273,6 +273,7 @@ static inline struct nf_conn_help *nfct_
if (!(ct->features & NF_CT_F_HELP))
return NULL;
+ offset = ALIGN(offset, __alignof__(struct nf_conn_help));
return (struct nf_conn_help *) ((void *)ct + offset);
}
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 03b3ed8..2628f4b 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -97,13 +97,14 @@ static inline int unhelp(struct nf_connt
int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
{
- int ret;
+ int size, ret;
+
BUG_ON(me->timeout == 0);
+ size = ALIGN(sizeof(struct nf_conn), __alignof__(struct nf_conn_help)) +
+ sizeof(struct nf_conn_help);
ret = nf_conntrack_register_cache(NF_CT_F_HELP, "nf_conntrack:help",
- sizeof(struct nf_conn)
- + sizeof(struct nf_conn_help)
- + __alignof__(struct nf_conn_help));
+ size);
if (ret < 0) {
printk(KERN_ERR "nf_conntrack_helper_register: Unable to create slab cache for conntracks\n");
return ret;
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 04/20]: nf_conntrack: endian annotations
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (2 preceding siblings ...)
2006-12-02 14:49 ` [NETFILTER 03/20]: nf_conntrack: fix helper structure alignment Patrick McHardy
@ 2006-12-02 14:49 ` Patrick McHardy
2006-12-02 14:49 ` [NETFILTER 05/20]: nf_conntrack: automatic helper assignment for expectations Patrick McHardy
` (16 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:49 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack: endian annotations
Resync with Al Viro's ip_conntrack annotations and fix a missed
spot in ip_nat_proto_icmp.c.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit 3dc28b1e6e6e9e4f9064ab33fa57b56ccb9a7a67
tree 1230abd39b6ace1910a53c3881ba412ad4811469
parent fd155ea4144ef3b1d15705284b9513b42870e363
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:56 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:56 +0100
include/net/netfilter/nf_conntrack_tuple.h | 18 ++++++------
net/ipv4/netfilter/ip_nat_proto_icmp.c | 4 +--
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c | 8 ++---
net/ipv4/netfilter/nf_conntrack_proto_icmp.c | 2 +
net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c | 2 +
net/ipv6/netfilter/nf_conntrack_reasm.c | 26 ++++++++---------
net/netfilter/nf_conntrack_core.c | 6 +---
net/netfilter/nf_conntrack_ftp.c | 10 +++---
net/netfilter/nf_conntrack_netlink.c | 37 ++++++++++++------------
net/netfilter/nf_conntrack_proto_sctp.c | 2 +
net/netfilter/nf_conntrack_proto_tcp.c | 8 ++---
11 files changed, 58 insertions(+), 65 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack_tuple.h b/include/net/netfilter/nf_conntrack_tuple.h
index 530ef1f..be9dc9a 100644
--- a/include/net/netfilter/nf_conntrack_tuple.h
+++ b/include/net/netfilter/nf_conntrack_tuple.h
@@ -26,8 +26,8 @@ #define NF_CT_TUPLE_L3SIZE 4
network order! */
union nf_conntrack_man_l3proto {
u_int32_t all[NF_CT_TUPLE_L3SIZE];
- u_int32_t ip;
- u_int32_t ip6[4];
+ __be32 ip;
+ __be32 ip6[4];
};
/* The protocol-specific manipulable parts of the tuple: always in
@@ -38,16 +38,16 @@ union nf_conntrack_man_proto
u_int16_t all;
struct {
- u_int16_t port;
+ __be16 port;
} tcp;
struct {
- u_int16_t port;
+ __be16 port;
} udp;
struct {
- u_int16_t id;
+ __be16 id;
} icmp;
struct {
- u_int16_t port;
+ __be16 port;
} sctp;
};
@@ -77,16 +77,16 @@ struct nf_conntrack_tuple
u_int16_t all;
struct {
- u_int16_t port;
+ __be16 port;
} tcp;
struct {
- u_int16_t port;
+ __be16 port;
} udp;
struct {
u_int8_t type, code;
} icmp;
struct {
- u_int16_t port;
+ __be16 port;
} sctp;
} u;
diff --git a/net/ipv4/netfilter/ip_nat_proto_icmp.c b/net/ipv4/netfilter/ip_nat_proto_icmp.c
index 75266fe..fb716ed 100644
--- a/net/ipv4/netfilter/ip_nat_proto_icmp.c
+++ b/net/ipv4/netfilter/ip_nat_proto_icmp.c
@@ -24,8 +24,8 @@ icmp_in_range(const struct ip_conntrack_
const union ip_conntrack_manip_proto *min,
const union ip_conntrack_manip_proto *max)
{
- return (tuple->src.u.icmp.id >= min->icmp.id
- && tuple->src.u.icmp.id <= max->icmp.id);
+ return ntohs(tuple->src.u.icmp.id) >= ntohs(min->icmp.id) &&
+ ntohs(tuple->src.u.icmp.id) <= ntohs(max->icmp.id);
}
static int
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index f24e872..2b73e3e 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -41,7 +41,7 @@ #endif
static int ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff,
struct nf_conntrack_tuple *tuple)
{
- u_int32_t _addrs[2], *ap;
+ __be32 _addrs[2], *ap;
ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr),
sizeof(u_int32_t) * 2, _addrs);
if (ap == NULL)
@@ -410,10 +410,8 @@ static int ipv4_nfattr_to_tuple(struct n
if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
return -EINVAL;
- t->src.u3.ip =
- *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
- t->dst.u3.ip =
- *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
+ t->src.u3.ip = *(__be32 *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
+ t->dst.u3.ip = *(__be32 *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
return 0;
}
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index 46aa44a..d25002f 100644
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -311,7 +311,7 @@ static int icmp_nfattr_to_tuple(struct n
tuple->dst.u.icmp.code =
*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_CODE-1]);
tuple->src.u.icmp.id =
- *(u_int16_t *)NFA_DATA(tb[CTA_PROTO_ICMP_ID-1]);
+ *(__be16 *)NFA_DATA(tb[CTA_PROTO_ICMP_ID-1]);
if (tuple->dst.u.icmp.type >= sizeof(invmap)
|| !invmap[tuple->dst.u.icmp.type])
diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
index 1e8e700..3905cac 100644
--- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
@@ -287,7 +287,7 @@ static int icmpv6_nfattr_to_tuple(struct
tuple->dst.u.icmp.code =
*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMPV6_CODE-1]);
tuple->src.u.icmp.id =
- *(u_int16_t *)NFA_DATA(tb[CTA_PROTO_ICMPV6_ID-1]);
+ *(__be16 *)NFA_DATA(tb[CTA_PROTO_ICMPV6_ID-1]);
if (tuple->dst.u.icmp.type < 128
|| tuple->dst.u.icmp.type - 128 >= sizeof(invmap)
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index bf93c1e..37e5fca 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -72,7 +72,7 @@ struct nf_ct_frag6_queue
struct hlist_node list;
struct list_head lru_list; /* lru list member */
- __u32 id; /* fragment id */
+ __be32 id; /* fragment id */
struct in6_addr saddr;
struct in6_addr daddr;
@@ -115,28 +115,28 @@ static __inline__ void fq_unlink(struct
write_unlock(&nf_ct_frag6_lock);
}
-static unsigned int ip6qhashfn(u32 id, struct in6_addr *saddr,
+static unsigned int ip6qhashfn(__be32 id, struct in6_addr *saddr,
struct in6_addr *daddr)
{
u32 a, b, c;
- a = saddr->s6_addr32[0];
- b = saddr->s6_addr32[1];
- c = saddr->s6_addr32[2];
+ a = (__force u32)saddr->s6_addr32[0];
+ b = (__force u32)saddr->s6_addr32[1];
+ c = (__force u32)saddr->s6_addr32[2];
a += JHASH_GOLDEN_RATIO;
b += JHASH_GOLDEN_RATIO;
c += nf_ct_frag6_hash_rnd;
__jhash_mix(a, b, c);
- a += saddr->s6_addr32[3];
- b += daddr->s6_addr32[0];
- c += daddr->s6_addr32[1];
+ a += (__force u32)saddr->s6_addr32[3];
+ b += (__force u32)daddr->s6_addr32[0];
+ c += (__force u32)daddr->s6_addr32[1];
__jhash_mix(a, b, c);
- a += daddr->s6_addr32[2];
- b += daddr->s6_addr32[3];
- c += id;
+ a += (__force u32)daddr->s6_addr32[2];
+ b += (__force u32)daddr->s6_addr32[3];
+ c += (__force u32)id;
__jhash_mix(a, b, c);
return c & (FRAG6Q_HASHSZ - 1);
@@ -338,7 +338,7 @@ #endif
static struct nf_ct_frag6_queue *
-nf_ct_frag6_create(unsigned int hash, u32 id, struct in6_addr *src, struct in6_addr *dst)
+nf_ct_frag6_create(unsigned int hash, __be32 id, struct in6_addr *src, struct in6_addr *dst)
{
struct nf_ct_frag6_queue *fq;
@@ -366,7 +366,7 @@ oom:
}
static __inline__ struct nf_ct_frag6_queue *
-fq_find(u32 id, struct in6_addr *src, struct in6_addr *dst)
+fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst)
{
struct nf_ct_frag6_queue *fq;
struct hlist_node *n;
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index a672806..a401b1e 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -936,10 +936,8 @@ int nf_ct_port_nfattr_to_tuple(struct nf
if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
return -EINVAL;
- t->src.u.tcp.port =
- *(u_int16_t *)NFA_DATA(tb[CTA_PROTO_SRC_PORT-1]);
- t->dst.u.tcp.port =
- *(u_int16_t *)NFA_DATA(tb[CTA_PROTO_DST_PORT-1]);
+ t->src.u.tcp.port = *(__be16 *)NFA_DATA(tb[CTA_PROTO_SRC_PORT-1]);
+ t->dst.u.tcp.port = *(__be16 *)NFA_DATA(tb[CTA_PROTO_DST_PORT-1]);
return 0;
}
diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c
index 2d23501..fdac52b 100644
--- a/net/netfilter/nf_conntrack_ftp.c
+++ b/net/netfilter/nf_conntrack_ftp.c
@@ -173,7 +173,7 @@ static int try_rfc959(const char *data,
/* Grab port: number up to delimiter */
static int get_port(const char *data, int start, size_t dlen, char delim,
- u_int16_t *port)
+ __be16 *port)
{
u_int16_t tmp_port = 0;
int i;
@@ -502,12 +502,12 @@ static int help(struct sk_buff **pskb,
.u = { .tcp = { 0 }},
},
.dst = { .protonum = 0xFF,
- .u = { .tcp = { 0xFFFF }},
+ .u = { .tcp = { __constant_htons(0xFFFF) }},
},
};
if (cmd.l3num == PF_INET) {
- exp->mask.src.u3.ip = 0xFFFFFFFF;
- exp->mask.dst.u3.ip = 0xFFFFFFFF;
+ exp->mask.src.u3.ip = htonl(0xFFFFFFFF);
+ exp->mask.dst.u3.ip = htonl(0xFFFFFFFF);
} else {
memset(exp->mask.src.u3.ip6, 0xFF,
sizeof(exp->mask.src.u3.ip6));
@@ -588,7 +588,7 @@ static int __init nf_conntrack_ftp_init(
ftp[i][j].tuple.src.u.tcp.port = htons(ports[i]);
ftp[i][j].tuple.dst.protonum = IPPROTO_TCP;
ftp[i][j].mask.src.l3num = 0xFFFF;
- ftp[i][j].mask.src.u.tcp.port = 0xFFFF;
+ ftp[i][j].mask.src.u.tcp.port = htons(0xFFFF);
ftp[i][j].mask.dst.protonum = 0xFF;
ftp[i][j].max_expected = 1;
ftp[i][j].timeout = 5 * 60; /* 5 Minutes */
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index e3a7204..a693d3b 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -113,7 +113,7 @@ ctnetlink_dump_tuples(struct sk_buff *sk
static inline int
ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
{
- u_int32_t status = htonl((u_int32_t) ct->status);
+ __be32 status = htonl((u_int32_t) ct->status);
NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
return 0;
@@ -125,7 +125,7 @@ static inline int
ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
{
long timeout_l = ct->timeout.expires - jiffies;
- u_int32_t timeout;
+ __be32 timeout;
if (timeout_l < 0)
timeout = 0;
@@ -196,7 +196,7 @@ ctnetlink_dump_counters(struct sk_buff *
{
enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
struct nfattr *nest_count = NFA_NEST(skb, type);
- u_int32_t tmp;
+ __be32 tmp;
tmp = htonl(ct->counters[dir].packets);
NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
@@ -219,7 +219,7 @@ #ifdef CONFIG_NF_CONNTRACK_MARK
static inline int
ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
{
- u_int32_t mark = htonl(ct->mark);
+ __be32 mark = htonl(ct->mark);
NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
return 0;
@@ -234,7 +234,7 @@ #endif
static inline int
ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
{
- u_int32_t id = htonl(ct->id);
+ __be32 id = htonl(ct->id);
NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
return 0;
@@ -245,7 +245,7 @@ nfattr_failure:
static inline int
ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
{
- u_int32_t use = htonl(atomic_read(&ct->ct_general.use));
+ __be32 use = htonl(atomic_read(&ct->ct_general.use));
NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
return 0;
@@ -610,12 +610,12 @@ ctnetlink_parse_nat(struct nfattr *nat,
return -EINVAL;
if (tb[CTA_NAT_MINIP-1])
- range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
+ range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
if (!tb[CTA_NAT_MAXIP-1])
range->max_ip = range->min_ip;
else
- range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
+ range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
if (range->min_ip)
range->flags |= IP_NAT_RANGE_MAP_IPS;
@@ -688,7 +688,7 @@ ctnetlink_del_conntrack(struct sock *ctn
ct = nf_ct_tuplehash_to_ctrack(h);
if (cda[CTA_ID-1]) {
- u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1]));
+ u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1]));
if (ct->id != id) {
nf_ct_put(ct);
return -ENOENT;
@@ -781,7 +781,7 @@ static inline int
ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
{
unsigned long d;
- unsigned status = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1]));
+ unsigned int status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1]));
d = ct->status ^ status;
if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
@@ -880,7 +880,7 @@ ctnetlink_change_helper(struct nf_conn *
static inline int
ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[])
{
- u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
+ u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
if (!del_timer(&ct->timeout))
return -ETIME;
@@ -942,7 +942,7 @@ ctnetlink_change_conntrack(struct nf_con
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (cda[CTA_MARK-1])
- ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
+ ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
#endif
return 0;
@@ -963,7 +963,7 @@ ctnetlink_create_conntrack(struct nfattr
if (!cda[CTA_TIMEOUT-1])
goto err;
- ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
+ ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
ct->status |= IPS_CONFIRMED;
@@ -982,7 +982,7 @@ ctnetlink_create_conntrack(struct nfattr
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (cda[CTA_MARK-1])
- ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
+ ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
#endif
help = nfct_help(ct);
@@ -1117,8 +1117,8 @@ ctnetlink_exp_dump_expect(struct sk_buff
const struct nf_conntrack_expect *exp)
{
struct nf_conn *master = exp->master;
- u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
- u_int32_t id = htonl(exp->id);
+ __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
+ __be32 id = htonl(exp->id);
if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
goto nfattr_failure;
@@ -1296,7 +1296,7 @@ ctnetlink_get_expect(struct sock *ctnl,
return -ENOENT;
if (cda[CTA_EXPECT_ID-1]) {
- u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
+ __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
if (exp->id != ntohl(id)) {
nf_conntrack_expect_put(exp);
return -ENOENT;
@@ -1351,8 +1351,7 @@ ctnetlink_del_expect(struct sock *ctnl,
return -ENOENT;
if (cda[CTA_EXPECT_ID-1]) {
- u_int32_t id =
- *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
+ __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
if (exp->id != ntohl(id)) {
nf_conntrack_expect_put(exp);
return -ENOENT;
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index 7c64b9c..02b9323 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -217,7 +217,7 @@ #define for_each_sctp_chunk(skb, sch, _s
for (offset = dataoff + sizeof(sctp_sctphdr_t), count = 0; \
offset < skb->len && \
(sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch)); \
- offset += (htons(sch->length) + 3) & ~3, count++)
+ offset += (ntohs(sch->length) + 3) & ~3, count++)
/* Some validity checks to make sure the chunks are fine */
static int do_basic_checks(struct nf_conn *conntrack,
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index d99c7c4..71f492f 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -474,8 +474,8 @@ static void tcp_sack(const struct sk_buf
/* Fast path for timestamp-only option */
if (length == TCPOLEN_TSTAMP_ALIGNED*4
- && *(__u32 *)ptr ==
- __constant_ntohl((TCPOPT_NOP << 24)
+ && *(__be32 *)ptr ==
+ __constant_htonl((TCPOPT_NOP << 24)
| (TCPOPT_NOP << 16)
| (TCPOPT_TIMESTAMP << 8)
| TCPOLEN_TIMESTAMP))
@@ -506,9 +506,7 @@ static void tcp_sack(const struct sk_buf
for (i = 0;
i < (opsize - TCPOLEN_SACK_BASE);
i += TCPOLEN_SACK_PERBLOCK) {
- memcpy(&tmp, (__u32 *)(ptr + i) + 1,
- sizeof(__u32));
- tmp = ntohl(tmp);
+ tmp = ntohl(*((__be32 *)(ptr+i)+1));
if (after(tmp, *sack))
*sack = tmp;
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 05/20]: nf_conntrack: automatic helper assignment for expectations
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (3 preceding siblings ...)
2006-12-02 14:49 ` [NETFILTER 04/20]: nf_conntrack: endian annotations Patrick McHardy
@ 2006-12-02 14:49 ` Patrick McHardy
2006-12-02 14:49 ` [NETFILTER 06/20]: Kconfig: improve conntrack selection Patrick McHardy
` (15 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:49 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack: automatic helper assignment for expectations
Some helpers (namely H.323) manually assign further helpers to expected
connections. This is not possible with nf_conntrack anymore since we
need to know whether a helper is used at allocation time.
Handle the helper assignment centrally, which allows to perform the
correct allocation and as a nice side effect eliminates the need
for the H.323 helper to fiddle with nf_conntrack_lock.
Mid term the allocation scheme really needs to be redesigned since
we do both the helper and expectation lookup _twice_ for every new
connection.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit fff1e474556ff5fcae813c7b73a0a95c2b7143fc
tree 7f00d21c569f225d6990741a96a2905a0a02d788
parent 3dc28b1e6e6e9e4f9064ab33fa57b56ccb9a7a67
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:57 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:57 +0100
include/net/netfilter/nf_conntrack_expect.h | 3 +++
net/netfilter/nf_conntrack_core.c | 19 ++++++++++++++-----
net/netfilter/nf_conntrack_ftp.c | 1 +
net/netfilter/nf_conntrack_helper.c | 3 ++-
net/netfilter/nf_conntrack_netlink.c | 1 +
5 files changed, 21 insertions(+), 6 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack_expect.h b/include/net/netfilter/nf_conntrack_expect.h
index 2d335f0..5d853e8 100644
--- a/include/net/netfilter/nf_conntrack_expect.h
+++ b/include/net/netfilter/nf_conntrack_expect.h
@@ -22,6 +22,9 @@ struct nf_conntrack_expect
void (*expectfn)(struct nf_conn *new,
struct nf_conntrack_expect *this);
+ /* Helper to assign to new connection */
+ struct nf_conntrack_helper *helper;
+
/* The conntrack of the master connection */
struct nf_conn *master;
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index a401b1e..f952a7f 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -545,10 +545,10 @@ static int early_drop(struct list_head *
static struct nf_conn *
__nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
const struct nf_conntrack_tuple *repl,
- const struct nf_conntrack_l3proto *l3proto)
+ const struct nf_conntrack_l3proto *l3proto,
+ u_int32_t features)
{
struct nf_conn *conntrack = NULL;
- u_int32_t features = 0;
struct nf_conntrack_helper *helper;
if (unlikely(!nf_conntrack_hash_rnd_initted)) {
@@ -574,7 +574,7 @@ __nf_conntrack_alloc(const struct nf_con
}
/* find features needed by this conntrack. */
- features = l3proto->get_features(orig);
+ features |= l3proto->get_features(orig);
/* FIXME: protect helper list per RCU */
read_lock_bh(&nf_conntrack_lock);
@@ -624,7 +624,7 @@ struct nf_conn *nf_conntrack_alloc(const
struct nf_conntrack_l3proto *l3proto;
l3proto = __nf_ct_l3proto_find(orig->src.l3num);
- return __nf_conntrack_alloc(orig, repl, l3proto);
+ return __nf_conntrack_alloc(orig, repl, l3proto, 0);
}
void nf_conntrack_free(struct nf_conn *conntrack)
@@ -649,13 +649,20 @@ init_conntrack(const struct nf_conntrack
struct nf_conn *conntrack;
struct nf_conntrack_tuple repl_tuple;
struct nf_conntrack_expect *exp;
+ u_int32_t features = 0;
if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) {
DEBUGP("Can't invert tuple.\n");
return NULL;
}
- conntrack = __nf_conntrack_alloc(tuple, &repl_tuple, l3proto);
+ read_lock_bh(&nf_conntrack_lock);
+ exp = __nf_conntrack_expect_find(tuple);
+ if (exp && exp->helper)
+ features = NF_CT_F_HELP;
+ read_unlock_bh(&nf_conntrack_lock);
+
+ conntrack = __nf_conntrack_alloc(tuple, &repl_tuple, l3proto, features);
if (conntrack == NULL || IS_ERR(conntrack)) {
DEBUGP("Can't allocate conntrack.\n");
return (struct nf_conntrack_tuple_hash *)conntrack;
@@ -676,6 +683,8 @@ init_conntrack(const struct nf_conntrack
/* Welcome, Mr. Bond. We've been expecting you... */
__set_bit(IPS_EXPECTED_BIT, &conntrack->status);
conntrack->master = exp->master;
+ if (exp->helper)
+ nfct_help(conntrack)->helper = exp->helper;
#ifdef CONFIG_NF_CONNTRACK_MARK
conntrack->mark = exp->master->mark;
#endif
diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c
index fdac52b..e96c41d 100644
--- a/net/netfilter/nf_conntrack_ftp.c
+++ b/net/netfilter/nf_conntrack_ftp.c
@@ -516,6 +516,7 @@ static int help(struct sk_buff **pskb,
}
exp->expectfn = NULL;
+ exp->helper = NULL;
exp->flags = 0;
/* Now, NAT might want to mangle the packet, and register the
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 2628f4b..81542dc 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -129,7 +129,8 @@ void nf_conntrack_helper_unregister(stru
/* Get rid of expectations */
list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, list) {
struct nf_conn_help *help = nfct_help(exp->master);
- if (help->helper == me && del_timer(&exp->timeout)) {
+ if ((help->helper == me || exp->helper == me) &&
+ del_timer(&exp->timeout)) {
nf_ct_unlink_expect(exp);
nf_conntrack_expect_put(exp);
}
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index a693d3b..acaef40 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1447,6 +1447,7 @@ ctnetlink_create_expect(struct nfattr *c
exp->expectfn = NULL;
exp->flags = 0;
exp->master = ct;
+ exp->helper = NULL;
memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 06/20]: Kconfig: improve conntrack selection
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (4 preceding siblings ...)
2006-12-02 14:49 ` [NETFILTER 05/20]: nf_conntrack: automatic helper assignment for expectations Patrick McHardy
@ 2006-12-02 14:49 ` Patrick McHardy
2006-12-02 14:49 ` [NETFILTER 07/20]: nf_conntrack: add module aliases to IPv4 conntrack names Patrick McHardy
` (14 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:49 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: Kconfig: improve conntrack selection
Improve the connection tracking selection (well, the user experience,
not really the aesthetics) by offering one option to enable connection
tracking and a choice between the implementations.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit 03143a9731c29b2c5bd72881d76471d9d68922d0
tree e21b3fa96fd59e2688c323bc42861a1883ec40d5
parent fff1e474556ff5fcae813c7b73a0a95c2b7143fc
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:58 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:58 +0100
net/ipv4/netfilter/Kconfig | 14 ------------
net/netfilter/Kconfig | 50 +++++++++++++++++++++++++++++++++++++++-----
2 files changed, 44 insertions(+), 20 deletions(-)
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 06fec80..7148527 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -31,20 +31,6 @@ config NF_CONNTRACK_PROC_COMPAT
If unsure, say Y.
# connection tracking, helpers and protocols
-config IP_NF_CONNTRACK
- tristate "Connection tracking (required for masq/NAT)"
- ---help---
- Connection tracking keeps a record of what packets have passed
- through your machine, in order to figure out how they are related
- into connections.
-
- This is required to do Masquerading or other kinds of Network
- Address Translation (except for Fast NAT). It can also be used to
- enhance packet filtering (see `Connection state match support'
- below).
-
- To compile it as a module, choose M here. If unsure, say N.
-
config IP_NF_CT_ACCT
bool "Connection tracking flow accounting"
depends on IP_NF_CONNTRACK
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index d191dac..efe56f7 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -25,19 +25,57 @@ config NETFILTER_NETLINK_LOG
and is also scheduled to replace the old syslog-based ipt_LOG
and ip6t_LOG modules.
-config NF_CONNTRACK
- tristate "Layer 3 Independent Connection tracking (EXPERIMENTAL)"
- depends on EXPERIMENTAL && IP_NF_CONNTRACK=n
- default n
- ---help---
+config NF_CONNTRACK_ENABLED
+ tristate "Netfilter connection tracking support"
+ help
Connection tracking keeps a record of what packets have passed
through your machine, in order to figure out how they are related
into connections.
+ This is required to do Masquerading or other kinds of Network
+ Address Translation (except for Fast NAT). It can also be used to
+ enhance packet filtering (see `Connection state match support'
+ below).
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+choice
+ prompt "Netfilter connection tracking support"
+ depends on NF_CONNTRACK_ENABLED
+
+config NF_CONNTRACK_SUPPORT
+ bool "Layer 3 Independent Connection tracking (EXPERIMENTAL)"
+ depends on EXPERIMENTAL
+ help
Layer 3 independent connection tracking is experimental scheme
which generalize ip_conntrack to support other layer 3 protocols.
- To compile it as a module, choose M here. If unsure, say N.
+ This is required to do Masquerading or other kinds of Network
+ Address Translation (except for Fast NAT). It can also be used to
+ enhance packet filtering (see `Connection state match support'
+ below).
+
+config IP_NF_CONNTRACK_SUPPORT
+ bool "Layer 3 Dependent Connection tracking"
+ help
+ The old, Layer 3 dependent ip_conntrack subsystem of netfilter.
+
+ This is required to do Masquerading or other kinds of Network
+ Address Translation (except for Fast NAT). It can also be used to
+ enhance packet filtering (see `Connection state match support'
+ below).
+
+endchoice
+
+config NF_CONNTRACK
+ tristate
+ default m if NF_CONNTRACK_SUPPORT && NF_CONNTRACK_ENABLED=m
+ default y if NF_CONNTRACK_SUPPORT && NF_CONNTRACK_ENABLED=y
+
+config IP_NF_CONNTRACK
+ tristate
+ default m if IP_NF_CONNTRACK_SUPPORT && NF_CONNTRACK_ENABLED=m
+ default y if IP_NF_CONNTRACK_SUPPORT && NF_CONNTRACK_ENABLED=y
config NF_CT_ACCT
bool "Connection tracking flow accounting"
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 07/20]: nf_conntrack: add module aliases to IPv4 conntrack names
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (5 preceding siblings ...)
2006-12-02 14:49 ` [NETFILTER 06/20]: Kconfig: improve conntrack selection Patrick McHardy
@ 2006-12-02 14:49 ` Patrick McHardy
2006-12-02 14:49 ` [NETFILTER 08/20]: Add NAT support for nf_conntrack Patrick McHardy
` (13 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:49 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack: add module aliases to IPv4 conntrack names
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit 970f82888147acc34d493064dfe66d4374063e90
tree faccd8e1da38a3324f5fe1a9a8e4c29881474775
parent 03143a9731c29b2c5bd72881d76471d9d68922d0
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:59 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:33:59 +0100
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c | 1 +
net/netfilter/nf_conntrack_ftp.c | 1 +
net/netfilter/nf_conntrack_netlink.c | 1 +
net/netfilter/nf_conntrack_proto_sctp.c | 1 +
4 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index 2b73e3e..653f57b 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -446,6 +446,7 @@ #endif
};
MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET));
+MODULE_ALIAS("ip_conntrack");
MODULE_LICENSE("GPL");
static int __init nf_conntrack_l3proto_ipv4_init(void)
diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c
index e96c41d..e299d65 100644
--- a/net/netfilter/nf_conntrack_ftp.c
+++ b/net/netfilter/nf_conntrack_ftp.c
@@ -34,6 +34,7 @@ #include <linux/netfilter/nf_conntrack_f
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
MODULE_DESCRIPTION("ftp connection tracking helper");
+MODULE_ALIAS("ip_conntrack_ftp");
/* This is slow, but it's simple. --RR */
static char *ftp_buffer;
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index acaef40..f9c8ddd 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1544,6 +1544,7 @@ static struct nfnetlink_subsystem ctnl_e
.cb = ctnl_exp_cb,
};
+MODULE_ALIAS("ip_conntrack_netlink");
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index 02b9323..76e2636 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -716,3 +716,4 @@ module_exit(nf_conntrack_proto_sctp_fini
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kiran Kumar Immidi");
MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
+MODULE_ALIAS("ip_conntrack_proto_sctp");
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 08/20]: Add NAT support for nf_conntrack
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (6 preceding siblings ...)
2006-12-02 14:49 ` [NETFILTER 07/20]: nf_conntrack: add module aliases to IPv4 conntrack names Patrick McHardy
@ 2006-12-02 14:49 ` Patrick McHardy
2006-12-02 14:49 ` [NETFILTER 09/20]: nf_nat: add FTP NAT helper port Patrick McHardy
` (12 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:49 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: Add NAT support for nf_conntrack
Add NAT support for nf_conntrack. Joint work of Jozsef Kadlecsik,
Yasuyuki Kozakai, Martin Josefsson and myself.
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit 1c341bc77a3d189d65ce0455640ac03a1dc293da
tree 57109aec020a31d86ed8df9642a70d7e425d6ee2
parent 970f82888147acc34d493064dfe66d4374063e90
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:04 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:04 +0100
include/linux/netfilter.h | 2
include/net/netfilter/ipv4/nf_conntrack_ipv4.h | 20 -
include/net/netfilter/nf_conntrack.h | 29 +
include/net/netfilter/nf_conntrack_expect.h | 2
include/net/netfilter/nf_nat.h | 77 +++
include/net/netfilter/nf_nat_core.h | 27 +
include/net/netfilter/nf_nat_helper.h | 32 +
include/net/netfilter/nf_nat_protocol.h | 70 +++
include/net/netfilter/nf_nat_rule.h | 35 +
net/ipv4/netfilter/Kconfig | 30 +
net/ipv4/netfilter/Makefile | 7
net/ipv4/netfilter/ip_nat_standalone.c | 6
net/ipv4/netfilter/ipt_MASQUERADE.c | 29 +
net/ipv4/netfilter/ipt_NETMAP.c | 4
net/ipv4/netfilter/ipt_REDIRECT.c | 6
net/ipv4/netfilter/ipt_SAME.c | 12
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c | 7
net/ipv4/netfilter/nf_nat_core.c | 647 ++++++++++++++++++++++++
net/ipv4/netfilter/nf_nat_helper.c | 433 ++++++++++++++++
net/ipv4/netfilter/nf_nat_proto_icmp.c | 86 +++
net/ipv4/netfilter/nf_nat_proto_tcp.c | 148 +++++
net/ipv4/netfilter/nf_nat_proto_udp.c | 138 +++++
net/ipv4/netfilter/nf_nat_proto_unknown.c | 54 ++
net/ipv4/netfilter/nf_nat_rule.c | 343 +++++++++++++
net/ipv4/netfilter/nf_nat_standalone.c | 406 +++++++++++++++
net/netfilter/nf_conntrack_core.c | 23 +
net/netfilter/nf_conntrack_netlink.c | 46 +-
net/netfilter/nf_conntrack_proto_tcp.c | 2
net/netfilter/nf_conntrack_standalone.c | 5
29 files changed, 2667 insertions(+), 59 deletions(-)
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index f6f3fcb..d4c4c51 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -357,7 +357,7 @@ extern void (*ip_nat_decode_session)(str
static inline void
nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, int family)
{
-#ifdef CONFIG_IP_NF_NAT_NEEDED
+#if defined(CONFIG_IP_NF_NAT_NEEDED) || defined(CONFIG_NF_NAT_NEEDED)
void (*decodefn)(struct sk_buff *, struct flowi *);
if (family == AF_INET && (decodefn = ip_nat_decode_session) != NULL)
diff --git a/include/net/netfilter/ipv4/nf_conntrack_ipv4.h b/include/net/netfilter/ipv4/nf_conntrack_ipv4.h
index 34b453a..a1c57ee 100644
--- a/include/net/netfilter/ipv4/nf_conntrack_ipv4.h
+++ b/include/net/netfilter/ipv4/nf_conntrack_ipv4.h
@@ -9,29 +9,23 @@
#ifndef _NF_CONNTRACK_IPV4_H
#define _NF_CONNTRACK_IPV4_H
-#ifdef CONFIG_IP_NF_NAT_NEEDED
-#include <linux/netfilter_ipv4/ip_nat.h>
+#ifdef CONFIG_NF_NAT_NEEDED
+#include <net/netfilter/nf_nat.h>
/* per conntrack: nat application helper private data */
-union ip_conntrack_nat_help {
+union nf_conntrack_nat_help {
/* insert nat helper private data here */
};
-struct nf_conntrack_ipv4_nat {
- struct ip_nat_info info;
- union ip_conntrack_nat_help help;
+struct nf_conn_nat {
+ struct nf_nat_info info;
+ union nf_conntrack_nat_help help;
#if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
int masq_index;
#endif
};
-#endif /* CONFIG_IP_NF_NAT_NEEDED */
-
-struct nf_conntrack_ipv4 {
-#ifdef CONFIG_IP_NF_NAT_NEEDED
- struct nf_conntrack_ipv4_nat *nat;
-#endif
-};
+#endif /* CONFIG_NF_NAT_NEEDED */
/* Returns new sk_buff, or NULL */
struct sk_buff *
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index b4beb8c..9948af0 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -264,18 +264,45 @@ nf_conntrack_unregister_cache(u_int32_t
/* valid combinations:
* basic: nf_conn, nf_conn .. nf_conn_help
- * nat: nf_conn .. nf_conn_nat, nf_conn .. nf_conn_nat, nf_conn help
+ * nat: nf_conn .. nf_conn_nat, nf_conn .. nf_conn_nat .. nf_conn help
*/
+#ifdef CONFIG_NF_NAT_NEEDED
+static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
+{
+ unsigned int offset = sizeof(struct nf_conn);
+
+ if (!(ct->features & NF_CT_F_NAT))
+ return NULL;
+
+ offset = ALIGN(offset, __alignof__(struct nf_conn_nat));
+ return (struct nf_conn_nat *) ((void *)ct + offset);
+}
+
static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
{
unsigned int offset = sizeof(struct nf_conn);
if (!(ct->features & NF_CT_F_HELP))
return NULL;
+ if (ct->features & NF_CT_F_NAT) {
+ offset = ALIGN(offset, __alignof__(struct nf_conn_nat));
+ offset += sizeof(struct nf_conn_nat);
+ }
offset = ALIGN(offset, __alignof__(struct nf_conn_help));
return (struct nf_conn_help *) ((void *)ct + offset);
}
+#else /* No NAT */
+static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
+{
+ unsigned int offset = sizeof(struct nf_conn);
+
+ if (!(ct->features & NF_CT_F_HELP))
+ return NULL;
+ offset = ALIGN(offset, __alignof__(struct nf_conn_help));
+ return (struct nf_conn_help *) ((void *)ct + offset);
+}
+#endif /* CONFIG_NF_NAT_NEEDED */
#endif /* __KERNEL__ */
#endif /* _NF_CONNTRACK_H */
diff --git a/include/net/netfilter/nf_conntrack_expect.h b/include/net/netfilter/nf_conntrack_expect.h
index 5d853e8..b969c43 100644
--- a/include/net/netfilter/nf_conntrack_expect.h
+++ b/include/net/netfilter/nf_conntrack_expect.h
@@ -43,7 +43,7 @@ struct nf_conntrack_expect
#ifdef CONFIG_NF_NAT_NEEDED
/* This is the original per-proto part, used to map the
* expected connection the way the recipient expects. */
- union nf_conntrack_manip_proto saved_proto;
+ union nf_conntrack_man_proto saved_proto;
/* Direction relative to the master connection. */
enum ip_conntrack_dir dir;
#endif
diff --git a/include/net/netfilter/nf_nat.h b/include/net/netfilter/nf_nat.h
new file mode 100644
index 0000000..61c6206
--- /dev/null
+++ b/include/net/netfilter/nf_nat.h
@@ -0,0 +1,77 @@
+#ifndef _NF_NAT_H
+#define _NF_NAT_H
+#include <linux/netfilter_ipv4.h>
+#include <net/netfilter/nf_conntrack_tuple.h>
+
+#define NF_NAT_MAPPING_TYPE_MAX_NAMELEN 16
+
+enum nf_nat_manip_type
+{
+ IP_NAT_MANIP_SRC,
+ IP_NAT_MANIP_DST
+};
+
+/* SRC manip occurs POST_ROUTING or LOCAL_IN */
+#define HOOK2MANIP(hooknum) ((hooknum) != NF_IP_POST_ROUTING && (hooknum) != NF_IP_LOCAL_IN)
+
+#define IP_NAT_RANGE_MAP_IPS 1
+#define IP_NAT_RANGE_PROTO_SPECIFIED 2
+
+/* NAT sequence number modifications */
+struct nf_nat_seq {
+ /* position of the last TCP sequence number modification (if any) */
+ u_int32_t correction_pos;
+
+ /* sequence number offset before and after last modification */
+ int16_t offset_before, offset_after;
+};
+
+/* Single range specification. */
+struct nf_nat_range
+{
+ /* Set to OR of flags above. */
+ unsigned int flags;
+
+ /* Inclusive: network order. */
+ __be32 min_ip, max_ip;
+
+ /* Inclusive: network order */
+ union nf_conntrack_man_proto min, max;
+};
+
+/* For backwards compat: don't use in modern code. */
+struct nf_nat_multi_range_compat
+{
+ unsigned int rangesize; /* Must be 1. */
+
+ /* hangs off end. */
+ struct nf_nat_range range[1];
+};
+
+#ifdef __KERNEL__
+#include <linux/list.h>
+
+/* The structure embedded in the conntrack structure. */
+struct nf_nat_info
+{
+ struct list_head bysource;
+ struct nf_nat_seq seq[IP_CT_DIR_MAX];
+};
+
+struct nf_conn;
+
+/* Set up the info structure to map into this range. */
+extern unsigned int nf_nat_setup_info(struct nf_conn *ct,
+ const struct nf_nat_range *range,
+ unsigned int hooknum);
+
+/* Is this tuple already taken? (not by us)*/
+extern int nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
+ const struct nf_conn *ignored_conntrack);
+
+extern int nf_nat_module_is_loaded;
+
+#else /* !__KERNEL__: iptables wants this to compile. */
+#define nf_nat_multi_range nf_nat_multi_range_compat
+#endif /*__KERNEL__*/
+#endif
diff --git a/include/net/netfilter/nf_nat_core.h b/include/net/netfilter/nf_nat_core.h
new file mode 100644
index 0000000..9778ffa
--- /dev/null
+++ b/include/net/netfilter/nf_nat_core.h
@@ -0,0 +1,27 @@
+#ifndef _NF_NAT_CORE_H
+#define _NF_NAT_CORE_H
+#include <linux/list.h>
+#include <net/netfilter/nf_conntrack.h>
+
+/* This header used to share core functionality between the standalone
+ NAT module, and the compatibility layer's use of NAT for masquerading. */
+
+extern unsigned int nf_nat_packet(struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned int hooknum,
+ struct sk_buff **pskb);
+
+extern int nf_nat_icmp_reply_translation(struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned int hooknum,
+ struct sk_buff **pskb);
+
+static inline int nf_nat_initialized(struct nf_conn *ct,
+ enum nf_nat_manip_type manip)
+{
+ if (manip == IP_NAT_MANIP_SRC)
+ return test_bit(IPS_SRC_NAT_DONE_BIT, &ct->status);
+ else
+ return test_bit(IPS_DST_NAT_DONE_BIT, &ct->status);
+}
+#endif /* _NF_NAT_CORE_H */
diff --git a/include/net/netfilter/nf_nat_helper.h b/include/net/netfilter/nf_nat_helper.h
new file mode 100644
index 0000000..ec98ecf
--- /dev/null
+++ b/include/net/netfilter/nf_nat_helper.h
@@ -0,0 +1,32 @@
+#ifndef _NF_NAT_HELPER_H
+#define _NF_NAT_HELPER_H
+/* NAT protocol helper routines. */
+
+#include <net/netfilter/nf_conntrack.h>
+
+struct sk_buff;
+
+/* These return true or false. */
+extern int nf_nat_mangle_tcp_packet(struct sk_buff **skb,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned int match_offset,
+ unsigned int match_len,
+ const char *rep_buffer,
+ unsigned int rep_len);
+extern int nf_nat_mangle_udp_packet(struct sk_buff **skb,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned int match_offset,
+ unsigned int match_len,
+ const char *rep_buffer,
+ unsigned int rep_len);
+extern int nf_nat_seq_adjust(struct sk_buff **pskb,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo);
+
+/* Setup NAT on this expected conntrack so it follows master, but goes
+ * to port ct->master->saved_proto. */
+extern void nf_nat_follow_master(struct nf_conn *ct,
+ struct nf_conntrack_expect *this);
+#endif
diff --git a/include/net/netfilter/nf_nat_protocol.h b/include/net/netfilter/nf_nat_protocol.h
new file mode 100644
index 0000000..a9ec5ef
--- /dev/null
+++ b/include/net/netfilter/nf_nat_protocol.h
@@ -0,0 +1,70 @@
+/* Header for use in defining a given protocol. */
+#ifndef _NF_NAT_PROTOCOL_H
+#define _NF_NAT_PROTOCOL_H
+#include <net/netfilter/nf_nat.h>
+#include <linux/netfilter/nfnetlink_conntrack.h>
+
+struct nf_nat_range;
+
+struct nf_nat_protocol
+{
+ /* Protocol name */
+ const char *name;
+
+ /* Protocol number. */
+ unsigned int protonum;
+
+ struct module *me;
+
+ /* Translate a packet to the target according to manip type.
+ Return true if succeeded. */
+ int (*manip_pkt)(struct sk_buff **pskb,
+ unsigned int iphdroff,
+ const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype);
+
+ /* Is the manipable part of the tuple between min and max incl? */
+ int (*in_range)(const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype,
+ const union nf_conntrack_man_proto *min,
+ const union nf_conntrack_man_proto *max);
+
+ /* Alter the per-proto part of the tuple (depending on
+ maniptype), to give a unique tuple in the given range if
+ possible; return false if not. Per-protocol part of tuple
+ is initialized to the incoming packet. */
+ int (*unique_tuple)(struct nf_conntrack_tuple *tuple,
+ const struct nf_nat_range *range,
+ enum nf_nat_manip_type maniptype,
+ const struct nf_conn *ct);
+
+ int (*range_to_nfattr)(struct sk_buff *skb,
+ const struct nf_nat_range *range);
+
+ int (*nfattr_to_range)(struct nfattr *tb[],
+ struct nf_nat_range *range);
+};
+
+/* Protocol registration. */
+extern int nf_nat_protocol_register(struct nf_nat_protocol *proto);
+extern void nf_nat_protocol_unregister(struct nf_nat_protocol *proto);
+
+extern struct nf_nat_protocol *nf_nat_proto_find_get(u_int8_t protocol);
+extern void nf_nat_proto_put(struct nf_nat_protocol *proto);
+
+/* Built-in protocols. */
+extern struct nf_nat_protocol nf_nat_protocol_tcp;
+extern struct nf_nat_protocol nf_nat_protocol_udp;
+extern struct nf_nat_protocol nf_nat_protocol_icmp;
+extern struct nf_nat_protocol nf_nat_unknown_protocol;
+
+extern int init_protocols(void) __init;
+extern void cleanup_protocols(void);
+extern struct nf_nat_protocol *find_nat_proto(u_int16_t protonum);
+
+extern int nf_nat_port_range_to_nfattr(struct sk_buff *skb,
+ const struct nf_nat_range *range);
+extern int nf_nat_port_nfattr_to_range(struct nfattr *tb[],
+ struct nf_nat_range *range);
+
+#endif /*_NF_NAT_PROTO_H*/
diff --git a/include/net/netfilter/nf_nat_rule.h b/include/net/netfilter/nf_nat_rule.h
new file mode 100644
index 0000000..f191c67
--- /dev/null
+++ b/include/net/netfilter/nf_nat_rule.h
@@ -0,0 +1,35 @@
+#ifndef _NF_NAT_RULE_H
+#define _NF_NAT_RULE_H
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_nat.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+/* Compatibility definitions for ipt_FOO modules */
+#define ip_nat_range nf_nat_range
+#define ip_conntrack_tuple nf_conntrack_tuple
+#define ip_conntrack_get nf_ct_get
+#define ip_conntrack nf_conn
+#define ip_nat_setup_info nf_nat_setup_info
+#define ip_nat_multi_range_compat nf_nat_multi_range_compat
+#define ip_ct_iterate_cleanup nf_ct_iterate_cleanup
+#define IP_NF_ASSERT NF_CT_ASSERT
+
+extern int nf_nat_rule_init(void) __init;
+extern void nf_nat_rule_cleanup(void);
+extern int nf_nat_rule_find(struct sk_buff **pskb,
+ unsigned int hooknum,
+ const struct net_device *in,
+ const struct net_device *out,
+ struct nf_conn *ct,
+ struct nf_nat_info *info);
+
+extern unsigned int
+alloc_null_binding(struct nf_conn *ct,
+ struct nf_nat_info *info,
+ unsigned int hooknum);
+
+extern unsigned int
+alloc_null_binding_confirmed(struct nf_conn *ct,
+ struct nf_nat_info *info,
+ unsigned int hooknum);
+#endif /* _NF_NAT_RULE_H */
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 7148527..01789ae 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -6,7 +6,7 @@ menu "IP: Netfilter Configuration"
depends on INET && NETFILTER
config NF_CONNTRACK_IPV4
- tristate "IPv4 support for new connection tracking (EXPERIMENTAL)"
+ tristate "IPv4 support for new connection tracking (required for NAT) (EXPERIMENTAL)"
depends on EXPERIMENTAL && NF_CONNTRACK
---help---
Connection tracking keeps a record of what packets have passed
@@ -387,7 +387,7 @@ config IP_NF_TARGET_TCPMSS
To compile it as a module, choose M here. If unsure, say N.
-# NAT + specific targets
+# NAT + specific targets: ip_conntrack
config IP_NF_NAT
tristate "Full NAT"
depends on IP_NF_IPTABLES && IP_NF_CONNTRACK
@@ -398,14 +398,30 @@ config IP_NF_NAT
To compile it as a module, choose M here. If unsure, say N.
+# NAT + specific targets: nf_conntrack
+config NF_NAT
+ tristate "Full NAT"
+ depends on IP_NF_IPTABLES && NF_CONNTRACK
+ help
+ The Full NAT option allows masquerading, port forwarding and other
+ forms of full Network Address Port Translation. It is controlled by
+ the `nat' table in iptables: see the man page for iptables(8).
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config IP_NF_NAT_NEEDED
bool
- depends on IP_NF_NAT != n
+ depends on IP_NF_NAT
+ default y
+
+config NF_NAT_NEEDED
+ bool
+ depends on NF_NAT
default y
config IP_NF_TARGET_MASQUERADE
tristate "MASQUERADE target support"
- depends on IP_NF_NAT
+ depends on (NF_NAT || IP_NF_NAT)
help
Masquerading is a special case of NAT: all outgoing connections are
changed to seem to come from a particular interface's address, and
@@ -417,7 +433,7 @@ config IP_NF_TARGET_MASQUERADE
config IP_NF_TARGET_REDIRECT
tristate "REDIRECT target support"
- depends on IP_NF_NAT
+ depends on (NF_NAT || IP_NF_NAT)
help
REDIRECT is a special case of NAT: all incoming connections are
mapped onto the incoming interface's address, causing the packets to
@@ -428,7 +444,7 @@ config IP_NF_TARGET_REDIRECT
config IP_NF_TARGET_NETMAP
tristate "NETMAP target support"
- depends on IP_NF_NAT
+ depends on (NF_NAT || IP_NF_NAT)
help
NETMAP is an implementation of static 1:1 NAT mapping of network
addresses. It maps the network address part, while keeping the host
@@ -439,7 +455,7 @@ config IP_NF_TARGET_NETMAP
config IP_NF_TARGET_SAME
tristate "SAME target support"
- depends on IP_NF_NAT
+ depends on (NF_NAT || IP_NF_NAT)
help
This option adds a `SAME' target, which works like the standard SNAT
target, but attempts to give clients the same IP for all connections.
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 21359d8..ec31690 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -5,7 +5,12 @@ #
# objects for the standalone - connection tracking / NAT
ip_conntrack-objs := ip_conntrack_standalone.o ip_conntrack_core.o ip_conntrack_proto_generic.o ip_conntrack_proto_tcp.o ip_conntrack_proto_udp.o ip_conntrack_proto_icmp.o
ip_nat-objs := ip_nat_core.o ip_nat_helper.o ip_nat_proto_unknown.o ip_nat_proto_tcp.o ip_nat_proto_udp.o ip_nat_proto_icmp.o
+nf_nat-objs := nf_nat_core.o nf_nat_helper.o nf_nat_proto_unknown.o nf_nat_proto_tcp.o nf_nat_proto_udp.o nf_nat_proto_icmp.o
+ifneq ($(CONFIG_NF_NAT),)
+iptable_nat-objs := nf_nat_rule.o nf_nat_standalone.o
+else
iptable_nat-objs := ip_nat_rule.o ip_nat_standalone.o
+endif
ip_conntrack_pptp-objs := ip_conntrack_helper_pptp.o ip_conntrack_proto_gre.o
ip_nat_pptp-objs := ip_nat_helper_pptp.o ip_nat_proto_gre.o
@@ -16,6 +21,7 @@ ip_nat_h323-objs := ip_nat_helper_h323.o
# connection tracking
obj-$(CONFIG_IP_NF_CONNTRACK) += ip_conntrack.o
obj-$(CONFIG_IP_NF_NAT) += ip_nat.o
+obj-$(CONFIG_NF_NAT) += nf_nat.o
# conntrack netlink interface
obj-$(CONFIG_IP_NF_CONNTRACK_NETLINK) += ip_conntrack_netlink.o
@@ -50,6 +56,7 @@ # the three instances of ip_tables
obj-$(CONFIG_IP_NF_FILTER) += iptable_filter.o
obj-$(CONFIG_IP_NF_MANGLE) += iptable_mangle.o
obj-$(CONFIG_IP_NF_NAT) += iptable_nat.o
+obj-$(CONFIG_NF_NAT) += iptable_nat.o
obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
# matches
diff --git a/net/ipv4/netfilter/ip_nat_standalone.c b/net/ipv4/netfilter/ip_nat_standalone.c
index d85d2de..ad66328 100644
--- a/net/ipv4/netfilter/ip_nat_standalone.c
+++ b/net/ipv4/netfilter/ip_nat_standalone.c
@@ -44,12 +44,6 @@ #else
#define DEBUGP(format, args...)
#endif
-#define HOOKNAME(hooknum) ((hooknum) == NF_IP_POST_ROUTING ? "POST_ROUTING" \
- : ((hooknum) == NF_IP_PRE_ROUTING ? "PRE_ROUTING" \
- : ((hooknum) == NF_IP_LOCAL_OUT ? "LOCAL_OUT" \
- : ((hooknum) == NF_IP_LOCAL_IN ? "LOCAL_IN" \
- : "*ERROR*")))
-
#ifdef CONFIG_XFRM
static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
{
diff --git a/net/ipv4/netfilter/ipt_MASQUERADE.c b/net/ipv4/netfilter/ipt_MASQUERADE.c
index 3dbfcfa..28b9233 100644
--- a/net/ipv4/netfilter/ipt_MASQUERADE.c
+++ b/net/ipv4/netfilter/ipt_MASQUERADE.c
@@ -2,7 +2,7 @@
(depending on route). */
/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -20,7 +20,11 @@ #include <net/ip.h>
#include <net/checksum.h>
#include <net/route.h>
#include <linux/netfilter_ipv4.h>
+#ifdef CONFIG_NF_NAT_NEEDED
+#include <net/netfilter/nf_nat_rule.h>
+#else
#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#endif
#include <linux/netfilter_ipv4/ip_tables.h>
MODULE_LICENSE("GPL");
@@ -65,23 +69,33 @@ masquerade_target(struct sk_buff **pskb,
const struct xt_target *target,
const void *targinfo)
{
+#ifdef CONFIG_NF_NAT_NEEDED
+ struct nf_conn_nat *nat;
+#endif
struct ip_conntrack *ct;
enum ip_conntrack_info ctinfo;
- const struct ip_nat_multi_range_compat *mr;
struct ip_nat_range newrange;
+ const struct ip_nat_multi_range_compat *mr;
struct rtable *rt;
__be32 newsrc;
IP_NF_ASSERT(hooknum == NF_IP_POST_ROUTING);
ct = ip_conntrack_get(*pskb, &ctinfo);
+#ifdef CONFIG_NF_NAT_NEEDED
+ nat = nfct_nat(ct);
+#endif
IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED
|| ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY));
/* Source address is 0.0.0.0 - locally generated packet that is
* probably not supposed to be masqueraded.
*/
+#ifdef CONFIG_NF_NAT_NEEDED
+ if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip == 0)
+#else
if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip == 0)
+#endif
return NF_ACCEPT;
mr = targinfo;
@@ -93,7 +107,11 @@ masquerade_target(struct sk_buff **pskb,
}
write_lock_bh(&masq_lock);
+#ifdef CONFIG_NF_NAT_NEEDED
+ nat->masq_index = out->ifindex;
+#else
ct->nat.masq_index = out->ifindex;
+#endif
write_unlock_bh(&masq_lock);
/* Transfer from original range. */
@@ -109,10 +127,17 @@ masquerade_target(struct sk_buff **pskb,
static inline int
device_cmp(struct ip_conntrack *i, void *ifindex)
{
+#ifdef CONFIG_NF_NAT_NEEDED
+ struct nf_conn_nat *nat = nfct_nat(i);
+#endif
int ret;
read_lock_bh(&masq_lock);
+#ifdef CONFIG_NF_NAT_NEEDED
+ ret = (nat->masq_index == (int)(long)ifindex);
+#else
ret = (i->nat.masq_index == (int)(long)ifindex);
+#endif
read_unlock_bh(&masq_lock);
return ret;
diff --git a/net/ipv4/netfilter/ipt_NETMAP.c b/net/ipv4/netfilter/ipt_NETMAP.c
index 58a88f2..9390e90 100644
--- a/net/ipv4/netfilter/ipt_NETMAP.c
+++ b/net/ipv4/netfilter/ipt_NETMAP.c
@@ -15,7 +15,11 @@ #include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
+#ifdef CONFIG_NF_NAT_NEEDED
+#include <net/netfilter/nf_nat_rule.h>
+#else
#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#endif
#define MODULENAME "NETMAP"
MODULE_LICENSE("GPL");
diff --git a/net/ipv4/netfilter/ipt_REDIRECT.c b/net/ipv4/netfilter/ipt_REDIRECT.c
index c0dcfe9..462eceb 100644
--- a/net/ipv4/netfilter/ipt_REDIRECT.c
+++ b/net/ipv4/netfilter/ipt_REDIRECT.c
@@ -1,6 +1,6 @@
/* Redirect. Simple mapping which alters dst to a local IP address. */
/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -18,7 +18,11 @@ #include <linux/inetdevice.h>
#include <net/protocol.h>
#include <net/checksum.h>
#include <linux/netfilter_ipv4.h>
+#ifdef CONFIG_NF_NAT_NEEDED
+#include <net/netfilter/nf_nat_rule.h>
+#else
#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#endif
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
diff --git a/net/ipv4/netfilter/ipt_SAME.c b/net/ipv4/netfilter/ipt_SAME.c
index b38b133..3dcf294 100644
--- a/net/ipv4/netfilter/ipt_SAME.c
+++ b/net/ipv4/netfilter/ipt_SAME.c
@@ -34,7 +34,11 @@ #include <linux/inetdevice.h>
#include <net/protocol.h>
#include <net/checksum.h>
#include <linux/netfilter_ipv4.h>
+#ifdef CONFIG_NF_NAT_NEEDED
+#include <net/netfilter/nf_nat_rule.h>
+#else
#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#endif
#include <linux/netfilter_ipv4/ipt_SAME.h>
MODULE_LICENSE("GPL");
@@ -152,11 +156,17 @@ same_target(struct sk_buff **pskb,
Here we calculate the index in same->iparray which
holds the ipaddress we should use */
+#ifdef CONFIG_NF_NAT_NEEDED
+ tmpip = ntohl(t->src.u3.ip);
+
+ if (!(same->info & IPT_SAME_NODST))
+ tmpip += ntohl(t->dst.u3.ip);
+#else
tmpip = ntohl(t->src.ip);
if (!(same->info & IPT_SAME_NODST))
tmpip += ntohl(t->dst.ip);
-
+#endif
aindex = tmpip % same->ipnum;
new_ip = htonl(same->iparray[aindex]);
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index 653f57b..5655109 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -111,10 +111,10 @@ ipv4_prepare(struct sk_buff **pskb, unsi
return NF_ACCEPT;
}
-int nat_module_is_loaded = 0;
+int nf_nat_module_is_loaded = 0;
static u_int32_t ipv4_get_features(const struct nf_conntrack_tuple *tuple)
{
- if (nat_module_is_loaded)
+ if (nf_nat_module_is_loaded)
return NF_CT_F_NAT;
return NF_CT_F_BASIC;
@@ -532,3 +532,6 @@ module_init(nf_conntrack_l3proto_ipv4_in
module_exit(nf_conntrack_l3proto_ipv4_fini);
EXPORT_SYMBOL(nf_ct_ipv4_gather_frags);
+#ifdef CONFIG_NF_NAT_NEEDED
+EXPORT_SYMBOL(nf_nat_module_is_loaded);
+#endif
diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c
new file mode 100644
index 0000000..86a9227
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_core.c
@@ -0,0 +1,647 @@
+/* NAT for netfilter; shared with compatibility layer. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/skbuff.h>
+#include <linux/vmalloc.h>
+#include <net/checksum.h>
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/tcp.h> /* For tcp_prot in getorigdst */
+#include <linux/icmp.h>
+#include <linux/udp.h>
+#include <linux/jhash.h>
+
+#include <linux/netfilter_ipv4.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_helper.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_l3proto.h>
+#include <net/netfilter/nf_conntrack_l4proto.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static DEFINE_RWLOCK(nf_nat_lock);
+
+static struct nf_conntrack_l3proto *l3proto = NULL;
+
+/* Calculated at init based on memory size */
+static unsigned int nf_nat_htable_size;
+
+static struct list_head *bysource;
+
+#define MAX_IP_NAT_PROTO 256
+static struct nf_nat_protocol *nf_nat_protos[MAX_IP_NAT_PROTO];
+
+static inline struct nf_nat_protocol *
+__nf_nat_proto_find(u_int8_t protonum)
+{
+ return nf_nat_protos[protonum];
+}
+
+struct nf_nat_protocol *
+nf_nat_proto_find_get(u_int8_t protonum)
+{
+ struct nf_nat_protocol *p;
+
+ /* we need to disable preemption to make sure 'p' doesn't get
+ * removed until we've grabbed the reference */
+ preempt_disable();
+ p = __nf_nat_proto_find(protonum);
+ if (!try_module_get(p->me))
+ p = &nf_nat_unknown_protocol;
+ preempt_enable();
+
+ return p;
+}
+EXPORT_SYMBOL_GPL(nf_nat_proto_find_get);
+
+void
+nf_nat_proto_put(struct nf_nat_protocol *p)
+{
+ module_put(p->me);
+}
+EXPORT_SYMBOL_GPL(nf_nat_proto_put);
+
+/* We keep an extra hash for each conntrack, for fast searching. */
+static inline unsigned int
+hash_by_src(const struct nf_conntrack_tuple *tuple)
+{
+ /* Original src, to ensure we map it consistently if poss. */
+ return jhash_3words((__force u32)tuple->src.u3.ip, tuple->src.u.all,
+ tuple->dst.protonum, 0) % nf_nat_htable_size;
+}
+
+/* Noone using conntrack by the time this called. */
+static void nf_nat_cleanup_conntrack(struct nf_conn *conn)
+{
+ struct nf_conn_nat *nat;
+ if (!(conn->status & IPS_NAT_DONE_MASK))
+ return;
+
+ nat = nfct_nat(conn);
+ write_lock_bh(&nf_nat_lock);
+ list_del(&nat->info.bysource);
+ write_unlock_bh(&nf_nat_lock);
+}
+
+/* Is this tuple already taken? (not by us) */
+int
+nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
+ const struct nf_conn *ignored_conntrack)
+{
+ /* Conntrack tracking doesn't keep track of outgoing tuples; only
+ incoming ones. NAT means they don't have a fixed mapping,
+ so we invert the tuple and look for the incoming reply.
+
+ We could keep a separate hash if this proves too slow. */
+ struct nf_conntrack_tuple reply;
+
+ nf_ct_invert_tuplepr(&reply, tuple);
+ return nf_conntrack_tuple_taken(&reply, ignored_conntrack);
+}
+EXPORT_SYMBOL(nf_nat_used_tuple);
+
+/* If we source map this tuple so reply looks like reply_tuple, will
+ * that meet the constraints of range. */
+static int
+in_range(const struct nf_conntrack_tuple *tuple,
+ const struct nf_nat_range *range)
+{
+ struct nf_nat_protocol *proto;
+
+ proto = __nf_nat_proto_find(tuple->dst.protonum);
+ /* If we are supposed to map IPs, then we must be in the
+ range specified, otherwise let this drag us onto a new src IP. */
+ if (range->flags & IP_NAT_RANGE_MAP_IPS) {
+ if (ntohl(tuple->src.u3.ip) < ntohl(range->min_ip) ||
+ ntohl(tuple->src.u3.ip) > ntohl(range->max_ip))
+ return 0;
+ }
+
+ if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED) ||
+ proto->in_range(tuple, IP_NAT_MANIP_SRC,
+ &range->min, &range->max))
+ return 1;
+
+ return 0;
+}
+
+static inline int
+same_src(const struct nf_conn *ct,
+ const struct nf_conntrack_tuple *tuple)
+{
+ const struct nf_conntrack_tuple *t;
+
+ t = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+ return (t->dst.protonum == tuple->dst.protonum &&
+ t->src.u3.ip == tuple->src.u3.ip &&
+ t->src.u.all == tuple->src.u.all);
+}
+
+/* Only called for SRC manip */
+static int
+find_appropriate_src(const struct nf_conntrack_tuple *tuple,
+ struct nf_conntrack_tuple *result,
+ const struct nf_nat_range *range)
+{
+ unsigned int h = hash_by_src(tuple);
+ struct nf_conn_nat *nat;
+ struct nf_conn *ct;
+
+ read_lock_bh(&nf_nat_lock);
+ list_for_each_entry(nat, &bysource[h], info.bysource) {
+ ct = (struct nf_conn *)((char *)nat - offsetof(struct nf_conn, data));
+ if (same_src(ct, tuple)) {
+ /* Copy source part from reply tuple. */
+ nf_ct_invert_tuplepr(result,
+ &ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+ result->dst = tuple->dst;
+
+ if (in_range(result, range)) {
+ read_unlock_bh(&nf_nat_lock);
+ return 1;
+ }
+ }
+ }
+ read_unlock_bh(&nf_nat_lock);
+ return 0;
+}
+
+/* For [FUTURE] fragmentation handling, we want the least-used
+ src-ip/dst-ip/proto triple. Fairness doesn't come into it. Thus
+ if the range specifies 1.2.3.4 ports 10000-10005 and 1.2.3.5 ports
+ 1-65535, we don't do pro-rata allocation based on ports; we choose
+ the ip with the lowest src-ip/dst-ip/proto usage.
+*/
+static void
+find_best_ips_proto(struct nf_conntrack_tuple *tuple,
+ const struct nf_nat_range *range,
+ const struct nf_conn *ct,
+ enum nf_nat_manip_type maniptype)
+{
+ __be32 *var_ipp;
+ /* Host order */
+ u_int32_t minip, maxip, j;
+
+ /* No IP mapping? Do nothing. */
+ if (!(range->flags & IP_NAT_RANGE_MAP_IPS))
+ return;
+
+ if (maniptype == IP_NAT_MANIP_SRC)
+ var_ipp = &tuple->src.u3.ip;
+ else
+ var_ipp = &tuple->dst.u3.ip;
+
+ /* Fast path: only one choice. */
+ if (range->min_ip == range->max_ip) {
+ *var_ipp = range->min_ip;
+ return;
+ }
+
+ /* Hashing source and destination IPs gives a fairly even
+ * spread in practice (if there are a small number of IPs
+ * involved, there usually aren't that many connections
+ * anyway). The consistency means that servers see the same
+ * client coming from the same IP (some Internet Banking sites
+ * like this), even across reboots. */
+ minip = ntohl(range->min_ip);
+ maxip = ntohl(range->max_ip);
+ j = jhash_2words((__force u32)tuple->src.u3.ip,
+ (__force u32)tuple->dst.u3.ip, 0);
+ *var_ipp = htonl(minip + j % (maxip - minip + 1));
+}
+
+/* Manipulate the tuple into the range given. For NF_IP_POST_ROUTING,
+ * we change the source to map into the range. For NF_IP_PRE_ROUTING
+ * and NF_IP_LOCAL_OUT, we change the destination to map into the
+ * range. It might not be possible to get a unique tuple, but we try.
+ * At worst (or if we race), we will end up with a final duplicate in
+ * __ip_conntrack_confirm and drop the packet. */
+static void
+get_unique_tuple(struct nf_conntrack_tuple *tuple,
+ const struct nf_conntrack_tuple *orig_tuple,
+ const struct nf_nat_range *range,
+ struct nf_conn *ct,
+ enum nf_nat_manip_type maniptype)
+{
+ struct nf_nat_protocol *proto;
+
+ /* 1) If this srcip/proto/src-proto-part is currently mapped,
+ and that same mapping gives a unique tuple within the given
+ range, use that.
+
+ This is only required for source (ie. NAT/masq) mappings.
+ So far, we don't do local source mappings, so multiple
+ manips not an issue. */
+ if (maniptype == IP_NAT_MANIP_SRC) {
+ if (find_appropriate_src(orig_tuple, tuple, range)) {
+ DEBUGP("get_unique_tuple: Found current src map\n");
+ if (!nf_nat_used_tuple(tuple, ct))
+ return;
+ }
+ }
+
+ /* 2) Select the least-used IP/proto combination in the given
+ range. */
+ *tuple = *orig_tuple;
+ find_best_ips_proto(tuple, range, ct, maniptype);
+
+ /* 3) The per-protocol part of the manip is made to map into
+ the range to make a unique tuple. */
+
+ proto = nf_nat_proto_find_get(orig_tuple->dst.protonum);
+
+ /* Only bother mapping if it's not already in range and unique */
+ if ((!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED) ||
+ proto->in_range(tuple, maniptype, &range->min, &range->max)) &&
+ !nf_nat_used_tuple(tuple, ct)) {
+ nf_nat_proto_put(proto);
+ return;
+ }
+
+ /* Last change: get protocol to try to obtain unique tuple. */
+ proto->unique_tuple(tuple, range, maniptype, ct);
+
+ nf_nat_proto_put(proto);
+}
+
+unsigned int
+nf_nat_setup_info(struct nf_conn *ct,
+ const struct nf_nat_range *range,
+ unsigned int hooknum)
+{
+ struct nf_conntrack_tuple curr_tuple, new_tuple;
+ struct nf_conn_nat *nat = nfct_nat(ct);
+ struct nf_nat_info *info = &nat->info;
+ int have_to_hash = !(ct->status & IPS_NAT_DONE_MASK);
+ enum nf_nat_manip_type maniptype = HOOK2MANIP(hooknum);
+
+ NF_CT_ASSERT(hooknum == NF_IP_PRE_ROUTING ||
+ hooknum == NF_IP_POST_ROUTING ||
+ hooknum == NF_IP_LOCAL_IN ||
+ hooknum == NF_IP_LOCAL_OUT);
+ BUG_ON(nf_nat_initialized(ct, maniptype));
+
+ /* What we've got will look like inverse of reply. Normally
+ this is what is in the conntrack, except for prior
+ manipulations (future optimization: if num_manips == 0,
+ orig_tp =
+ conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple) */
+ nf_ct_invert_tuplepr(&curr_tuple,
+ &ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+
+ get_unique_tuple(&new_tuple, &curr_tuple, range, ct, maniptype);
+
+ if (!nf_ct_tuple_equal(&new_tuple, &curr_tuple)) {
+ struct nf_conntrack_tuple reply;
+
+ /* Alter conntrack table so will recognize replies. */
+ nf_ct_invert_tuplepr(&reply, &new_tuple);
+ nf_conntrack_alter_reply(ct, &reply);
+
+ /* Non-atomic: we own this at the moment. */
+ if (maniptype == IP_NAT_MANIP_SRC)
+ ct->status |= IPS_SRC_NAT;
+ else
+ ct->status |= IPS_DST_NAT;
+ }
+
+ /* Place in source hash if this is the first time. */
+ if (have_to_hash) {
+ unsigned int srchash;
+
+ srchash = hash_by_src(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+ write_lock_bh(&nf_nat_lock);
+ list_add(&info->bysource, &bysource[srchash]);
+ write_unlock_bh(&nf_nat_lock);
+ }
+
+ /* It's done. */
+ if (maniptype == IP_NAT_MANIP_DST)
+ set_bit(IPS_DST_NAT_DONE_BIT, &ct->status);
+ else
+ set_bit(IPS_SRC_NAT_DONE_BIT, &ct->status);
+
+ return NF_ACCEPT;
+}
+EXPORT_SYMBOL(nf_nat_setup_info);
+
+/* Returns true if succeeded. */
+static int
+manip_pkt(u_int16_t proto,
+ struct sk_buff **pskb,
+ unsigned int iphdroff,
+ const struct nf_conntrack_tuple *target,
+ enum nf_nat_manip_type maniptype)
+{
+ struct iphdr *iph;
+ struct nf_nat_protocol *p;
+
+ if (!skb_make_writable(pskb, iphdroff + sizeof(*iph)))
+ return 0;
+
+ iph = (void *)(*pskb)->data + iphdroff;
+
+ /* Manipulate protcol part. */
+ p = nf_nat_proto_find_get(proto);
+ if (!p->manip_pkt(pskb, iphdroff, target, maniptype)) {
+ nf_nat_proto_put(p);
+ return 0;
+ }
+ nf_nat_proto_put(p);
+
+ iph = (void *)(*pskb)->data + iphdroff;
+
+ if (maniptype == IP_NAT_MANIP_SRC) {
+ nf_csum_replace4(&iph->check, iph->saddr, target->src.u3.ip);
+ iph->saddr = target->src.u3.ip;
+ } else {
+ nf_csum_replace4(&iph->check, iph->daddr, target->dst.u3.ip);
+ iph->daddr = target->dst.u3.ip;
+ }
+ return 1;
+}
+
+/* Do packet manipulations according to nf_nat_setup_info. */
+unsigned int nf_nat_packet(struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned int hooknum,
+ struct sk_buff **pskb)
+{
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+ unsigned long statusbit;
+ enum nf_nat_manip_type mtype = HOOK2MANIP(hooknum);
+
+ if (mtype == IP_NAT_MANIP_SRC)
+ statusbit = IPS_SRC_NAT;
+ else
+ statusbit = IPS_DST_NAT;
+
+ /* Invert if this is reply dir. */
+ if (dir == IP_CT_DIR_REPLY)
+ statusbit ^= IPS_NAT_MASK;
+
+ /* Non-atomic: these bits don't change. */
+ if (ct->status & statusbit) {
+ struct nf_conntrack_tuple target;
+
+ /* We are aiming to look like inverse of other direction. */
+ nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
+
+ if (!manip_pkt(target.dst.protonum, pskb, 0, &target, mtype))
+ return NF_DROP;
+ }
+ return NF_ACCEPT;
+}
+EXPORT_SYMBOL_GPL(nf_nat_packet);
+
+/* Dir is direction ICMP is coming from (opposite to packet it contains) */
+int nf_nat_icmp_reply_translation(struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned int hooknum,
+ struct sk_buff **pskb)
+{
+ struct {
+ struct icmphdr icmp;
+ struct iphdr ip;
+ } *inside;
+ struct nf_conntrack_tuple inner, target;
+ int hdrlen = (*pskb)->nh.iph->ihl * 4;
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+ unsigned long statusbit;
+ enum nf_nat_manip_type manip = HOOK2MANIP(hooknum);
+
+ if (!skb_make_writable(pskb, hdrlen + sizeof(*inside)))
+ return 0;
+
+ inside = (void *)(*pskb)->data + (*pskb)->nh.iph->ihl*4;
+
+ /* We're actually going to mangle it beyond trivial checksum
+ adjustment, so make sure the current checksum is correct. */
+ if (nf_ip_checksum(*pskb, hooknum, hdrlen, 0))
+ return 0;
+
+ /* Must be RELATED */
+ NF_CT_ASSERT((*pskb)->nfctinfo == IP_CT_RELATED ||
+ (*pskb)->nfctinfo == IP_CT_RELATED+IP_CT_IS_REPLY);
+
+ /* Redirects on non-null nats must be dropped, else they'll
+ start talking to each other without our translation, and be
+ confused... --RR */
+ if (inside->icmp.type == ICMP_REDIRECT) {
+ /* If NAT isn't finished, assume it and drop. */
+ if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK)
+ return 0;
+
+ if (ct->status & IPS_NAT_MASK)
+ return 0;
+ }
+
+ DEBUGP("icmp_reply_translation: translating error %p manp %u dir %s\n",
+ *pskb, manip, dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY");
+
+ if (!nf_ct_get_tuple(*pskb,
+ (*pskb)->nh.iph->ihl*4 + sizeof(struct icmphdr),
+ (*pskb)->nh.iph->ihl*4 +
+ sizeof(struct icmphdr) + inside->ip.ihl*4,
+ (u_int16_t)AF_INET,
+ inside->ip.protocol,
+ &inner,
+ l3proto,
+ __nf_ct_l4proto_find((u_int16_t)PF_INET,
+ inside->ip.protocol)))
+ return 0;
+
+ /* Change inner back to look like incoming packet. We do the
+ opposite manip on this hook to normal, because it might not
+ pass all hooks (locally-generated ICMP). Consider incoming
+ packet: PREROUTING (DST manip), routing produces ICMP, goes
+ through POSTROUTING (which must correct the DST manip). */
+ if (!manip_pkt(inside->ip.protocol, pskb,
+ (*pskb)->nh.iph->ihl*4 + sizeof(inside->icmp),
+ &ct->tuplehash[!dir].tuple,
+ !manip))
+ return 0;
+
+ if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
+ /* Reloading "inside" here since manip_pkt inner. */
+ inside = (void *)(*pskb)->data + (*pskb)->nh.iph->ihl*4;
+ inside->icmp.checksum = 0;
+ inside->icmp.checksum =
+ csum_fold(skb_checksum(*pskb, hdrlen,
+ (*pskb)->len - hdrlen, 0));
+ }
+
+ /* Change outer to look the reply to an incoming packet
+ * (proto 0 means don't invert per-proto part). */
+ if (manip == IP_NAT_MANIP_SRC)
+ statusbit = IPS_SRC_NAT;
+ else
+ statusbit = IPS_DST_NAT;
+
+ /* Invert if this is reply dir. */
+ if (dir == IP_CT_DIR_REPLY)
+ statusbit ^= IPS_NAT_MASK;
+
+ if (ct->status & statusbit) {
+ nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
+ if (!manip_pkt(0, pskb, 0, &target, manip))
+ return 0;
+ }
+
+ return 1;
+}
+EXPORT_SYMBOL_GPL(nf_nat_icmp_reply_translation);
+
+/* Protocol registration. */
+int nf_nat_protocol_register(struct nf_nat_protocol *proto)
+{
+ int ret = 0;
+
+ write_lock_bh(&nf_nat_lock);
+ if (nf_nat_protos[proto->protonum] != &nf_nat_unknown_protocol) {
+ ret = -EBUSY;
+ goto out;
+ }
+ nf_nat_protos[proto->protonum] = proto;
+ out:
+ write_unlock_bh(&nf_nat_lock);
+ return ret;
+}
+EXPORT_SYMBOL(nf_nat_protocol_register);
+
+/* Noone stores the protocol anywhere; simply delete it. */
+void nf_nat_protocol_unregister(struct nf_nat_protocol *proto)
+{
+ write_lock_bh(&nf_nat_lock);
+ nf_nat_protos[proto->protonum] = &nf_nat_unknown_protocol;
+ write_unlock_bh(&nf_nat_lock);
+
+ /* Someone could be still looking at the proto in a bh. */
+ synchronize_net();
+}
+EXPORT_SYMBOL(nf_nat_protocol_unregister);
+
+#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
+ defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
+int
+nf_nat_port_range_to_nfattr(struct sk_buff *skb,
+ const struct nf_nat_range *range)
+{
+ NFA_PUT(skb, CTA_PROTONAT_PORT_MIN, sizeof(__be16),
+ &range->min.tcp.port);
+ NFA_PUT(skb, CTA_PROTONAT_PORT_MAX, sizeof(__be16),
+ &range->max.tcp.port);
+
+ return 0;
+
+nfattr_failure:
+ return -1;
+}
+EXPORT_SYMBOL_GPL(nf_nat_port_nfattr_to_range);
+
+int
+nf_nat_port_nfattr_to_range(struct nfattr *tb[], struct nf_nat_range *range)
+{
+ int ret = 0;
+
+ /* we have to return whether we actually parsed something or not */
+
+ if (tb[CTA_PROTONAT_PORT_MIN-1]) {
+ ret = 1;
+ range->min.tcp.port =
+ *(__be16 *)NFA_DATA(tb[CTA_PROTONAT_PORT_MIN-1]);
+ }
+
+ if (!tb[CTA_PROTONAT_PORT_MAX-1]) {
+ if (ret)
+ range->max.tcp.port = range->min.tcp.port;
+ } else {
+ ret = 1;
+ range->max.tcp.port =
+ *(__be16 *)NFA_DATA(tb[CTA_PROTONAT_PORT_MAX-1]);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nf_nat_port_range_to_nfattr);
+#endif
+
+static int __init nf_nat_init(void)
+{
+ size_t i;
+
+ /* Leave them the same for the moment. */
+ nf_nat_htable_size = nf_conntrack_htable_size;
+
+ /* One vmalloc for both hash tables */
+ bysource = vmalloc(sizeof(struct list_head) * nf_nat_htable_size);
+ if (!bysource)
+ return -ENOMEM;
+
+ /* Sew in builtin protocols. */
+ write_lock_bh(&nf_nat_lock);
+ for (i = 0; i < MAX_IP_NAT_PROTO; i++)
+ nf_nat_protos[i] = &nf_nat_unknown_protocol;
+ nf_nat_protos[IPPROTO_TCP] = &nf_nat_protocol_tcp;
+ nf_nat_protos[IPPROTO_UDP] = &nf_nat_protocol_udp;
+ nf_nat_protos[IPPROTO_ICMP] = &nf_nat_protocol_icmp;
+ write_unlock_bh(&nf_nat_lock);
+
+ for (i = 0; i < nf_nat_htable_size; i++) {
+ INIT_LIST_HEAD(&bysource[i]);
+ }
+
+ /* FIXME: Man, this is a hack. <SIGH> */
+ NF_CT_ASSERT(nf_conntrack_destroyed == NULL);
+ nf_conntrack_destroyed = &nf_nat_cleanup_conntrack;
+
+ /* Initialize fake conntrack so that NAT will skip it */
+ nf_conntrack_untracked.status |= IPS_NAT_DONE_MASK;
+
+ l3proto = nf_ct_l3proto_find_get((u_int16_t)AF_INET);
+ return 0;
+}
+
+/* Clear NAT section of all conntracks, in case we're loaded again. */
+static int clean_nat(struct nf_conn *i, void *data)
+{
+ struct nf_conn_nat *nat = nfct_nat(i);
+
+ if (!nat)
+ return 0;
+ memset(nat, 0, sizeof(nat));
+ i->status &= ~(IPS_NAT_MASK | IPS_NAT_DONE_MASK | IPS_SEQ_ADJUST);
+ return 0;
+}
+
+static void __exit nf_nat_cleanup(void)
+{
+ nf_ct_iterate_cleanup(&clean_nat, NULL);
+ nf_conntrack_destroyed = NULL;
+ vfree(bysource);
+ nf_ct_l3proto_put(l3proto);
+}
+
+MODULE_LICENSE("GPL");
+
+module_init(nf_nat_init);
+module_exit(nf_nat_cleanup);
diff --git a/net/ipv4/netfilter/nf_nat_helper.c b/net/ipv4/netfilter/nf_nat_helper.c
new file mode 100644
index 0000000..98fbfc8
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_helper.c
@@ -0,0 +1,433 @@
+/* ip_nat_helper.c - generic support functions for NAT helpers
+ *
+ * (C) 2000-2002 Harald Welte <laforge@netfilter.org>
+ * (C) 2003-2006 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/skbuff.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <net/checksum.h>
+#include <net/tcp.h>
+
+#include <linux/netfilter_ipv4.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_helper.h>
+
+#if 0
+#define DEBUGP printk
+#define DUMP_OFFSET(x) printk("offset_before=%d, offset_after=%d, correction_pos=%u\n", x->offset_before, x->offset_after, x->correction_pos);
+#else
+#define DEBUGP(format, args...)
+#define DUMP_OFFSET(x)
+#endif
+
+static DEFINE_SPINLOCK(nf_nat_seqofs_lock);
+
+/* Setup TCP sequence correction given this change at this sequence */
+static inline void
+adjust_tcp_sequence(u32 seq,
+ int sizediff,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ int dir;
+ struct nf_nat_seq *this_way, *other_way;
+ struct nf_conn_nat *nat = nfct_nat(ct);
+
+ DEBUGP("nf_nat_resize_packet: old_size = %u, new_size = %u\n",
+ (*skb)->len, new_size);
+
+ dir = CTINFO2DIR(ctinfo);
+
+ this_way = &nat->info.seq[dir];
+ other_way = &nat->info.seq[!dir];
+
+ DEBUGP("nf_nat_resize_packet: Seq_offset before: ");
+ DUMP_OFFSET(this_way);
+
+ spin_lock_bh(&nf_nat_seqofs_lock);
+
+ /* SYN adjust. If it's uninitialized, or this is after last
+ * correction, record it: we don't handle more than one
+ * adjustment in the window, but do deal with common case of a
+ * retransmit */
+ if (this_way->offset_before == this_way->offset_after ||
+ before(this_way->correction_pos, seq)) {
+ this_way->correction_pos = seq;
+ this_way->offset_before = this_way->offset_after;
+ this_way->offset_after += sizediff;
+ }
+ spin_unlock_bh(&nf_nat_seqofs_lock);
+
+ DEBUGP("nf_nat_resize_packet: Seq_offset after: ");
+ DUMP_OFFSET(this_way);
+}
+
+/* Frobs data inside this packet, which is linear. */
+static void mangle_contents(struct sk_buff *skb,
+ unsigned int dataoff,
+ unsigned int match_offset,
+ unsigned int match_len,
+ const char *rep_buffer,
+ unsigned int rep_len)
+{
+ unsigned char *data;
+
+ BUG_ON(skb_is_nonlinear(skb));
+ data = (unsigned char *)skb->nh.iph + dataoff;
+
+ /* move post-replacement */
+ memmove(data + match_offset + rep_len,
+ data + match_offset + match_len,
+ skb->tail - (data + match_offset + match_len));
+
+ /* insert data from buffer */
+ memcpy(data + match_offset, rep_buffer, rep_len);
+
+ /* update skb info */
+ if (rep_len > match_len) {
+ DEBUGP("nf_nat_mangle_packet: Extending packet by "
+ "%u from %u bytes\n", rep_len - match_len,
+ skb->len);
+ skb_put(skb, rep_len - match_len);
+ } else {
+ DEBUGP("nf_nat_mangle_packet: Shrinking packet from "
+ "%u from %u bytes\n", match_len - rep_len,
+ skb->len);
+ __skb_trim(skb, skb->len + rep_len - match_len);
+ }
+
+ /* fix IP hdr checksum information */
+ skb->nh.iph->tot_len = htons(skb->len);
+ ip_send_check(skb->nh.iph);
+}
+
+/* Unusual, but possible case. */
+static int enlarge_skb(struct sk_buff **pskb, unsigned int extra)
+{
+ struct sk_buff *nskb;
+
+ if ((*pskb)->len + extra > 65535)
+ return 0;
+
+ nskb = skb_copy_expand(*pskb, skb_headroom(*pskb), extra, GFP_ATOMIC);
+ if (!nskb)
+ return 0;
+
+ /* Transfer socket to new skb. */
+ if ((*pskb)->sk)
+ skb_set_owner_w(nskb, (*pskb)->sk);
+ kfree_skb(*pskb);
+ *pskb = nskb;
+ return 1;
+}
+
+/* Generic function for mangling variable-length address changes inside
+ * NATed TCP connections (like the PORT XXX,XXX,XXX,XXX,XXX,XXX
+ * command in FTP).
+ *
+ * Takes care about all the nasty sequence number changes, checksumming,
+ * skb enlargement, ...
+ *
+ * */
+int
+nf_nat_mangle_tcp_packet(struct sk_buff **pskb,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned int match_offset,
+ unsigned int match_len,
+ const char *rep_buffer,
+ unsigned int rep_len)
+{
+ struct iphdr *iph;
+ struct tcphdr *tcph;
+ int oldlen, datalen;
+
+ if (!skb_make_writable(pskb, (*pskb)->len))
+ return 0;
+
+ if (rep_len > match_len &&
+ rep_len - match_len > skb_tailroom(*pskb) &&
+ !enlarge_skb(pskb, rep_len - match_len))
+ return 0;
+
+ SKB_LINEAR_ASSERT(*pskb);
+
+ iph = (*pskb)->nh.iph;
+ tcph = (void *)iph + iph->ihl*4;
+
+ oldlen = (*pskb)->len - iph->ihl*4;
+ mangle_contents(*pskb, iph->ihl*4 + tcph->doff*4,
+ match_offset, match_len, rep_buffer, rep_len);
+
+ datalen = (*pskb)->len - iph->ihl*4;
+ if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
+ tcph->check = 0;
+ tcph->check = tcp_v4_check(tcph, datalen,
+ iph->saddr, iph->daddr,
+ csum_partial((char *)tcph,
+ datalen, 0));
+ } else
+ nf_proto_csum_replace2(&tcph->check, *pskb,
+ htons(oldlen), htons(datalen), 1);
+
+ if (rep_len != match_len) {
+ set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
+ adjust_tcp_sequence(ntohl(tcph->seq),
+ (int)rep_len - (int)match_len,
+ ct, ctinfo);
+ /* Tell TCP window tracking about seq change */
+ nf_conntrack_tcp_update(*pskb, (*pskb)->nh.iph->ihl*4,
+ ct, CTINFO2DIR(ctinfo));
+ }
+ return 1;
+}
+EXPORT_SYMBOL(nf_nat_mangle_tcp_packet);
+
+/* Generic function for mangling variable-length address changes inside
+ * NATed UDP connections (like the CONNECT DATA XXXXX MESG XXXXX INDEX XXXXX
+ * command in the Amanda protocol)
+ *
+ * Takes care about all the nasty sequence number changes, checksumming,
+ * skb enlargement, ...
+ *
+ * XXX - This function could be merged with nf_nat_mangle_tcp_packet which
+ * should be fairly easy to do.
+ */
+int
+nf_nat_mangle_udp_packet(struct sk_buff **pskb,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned int match_offset,
+ unsigned int match_len,
+ const char *rep_buffer,
+ unsigned int rep_len)
+{
+ struct iphdr *iph;
+ struct udphdr *udph;
+ int datalen, oldlen;
+
+ /* UDP helpers might accidentally mangle the wrong packet */
+ iph = (*pskb)->nh.iph;
+ if ((*pskb)->len < iph->ihl*4 + sizeof(*udph) +
+ match_offset + match_len)
+ return 0;
+
+ if (!skb_make_writable(pskb, (*pskb)->len))
+ return 0;
+
+ if (rep_len > match_len &&
+ rep_len - match_len > skb_tailroom(*pskb) &&
+ !enlarge_skb(pskb, rep_len - match_len))
+ return 0;
+
+ iph = (*pskb)->nh.iph;
+ udph = (void *)iph + iph->ihl*4;
+
+ oldlen = (*pskb)->len - iph->ihl*4;
+ mangle_contents(*pskb, iph->ihl*4 + sizeof(*udph),
+ match_offset, match_len, rep_buffer, rep_len);
+
+ /* update the length of the UDP packet */
+ datalen = (*pskb)->len - iph->ihl*4;
+ udph->len = htons(datalen);
+
+ /* fix udp checksum if udp checksum was previously calculated */
+ if (!udph->check && (*pskb)->ip_summed != CHECKSUM_PARTIAL)
+ return 1;
+
+ if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
+ udph->check = 0;
+ udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
+ datalen, IPPROTO_UDP,
+ csum_partial((char *)udph,
+ datalen, 0));
+ if (!udph->check)
+ udph->check = CSUM_MANGLED_0;
+ } else
+ nf_proto_csum_replace2(&udph->check, *pskb,
+ htons(oldlen), htons(datalen), 1);
+
+ return 1;
+}
+EXPORT_SYMBOL(nf_nat_mangle_udp_packet);
+
+/* Adjust one found SACK option including checksum correction */
+static void
+sack_adjust(struct sk_buff *skb,
+ struct tcphdr *tcph,
+ unsigned int sackoff,
+ unsigned int sackend,
+ struct nf_nat_seq *natseq)
+{
+ while (sackoff < sackend) {
+ struct tcp_sack_block_wire *sack;
+ __be32 new_start_seq, new_end_seq;
+
+ sack = (void *)skb->data + sackoff;
+ if (after(ntohl(sack->start_seq) - natseq->offset_before,
+ natseq->correction_pos))
+ new_start_seq = htonl(ntohl(sack->start_seq)
+ - natseq->offset_after);
+ else
+ new_start_seq = htonl(ntohl(sack->start_seq)
+ - natseq->offset_before);
+
+ if (after(ntohl(sack->end_seq) - natseq->offset_before,
+ natseq->correction_pos))
+ new_end_seq = htonl(ntohl(sack->end_seq)
+ - natseq->offset_after);
+ else
+ new_end_seq = htonl(ntohl(sack->end_seq)
+ - natseq->offset_before);
+
+ DEBUGP("sack_adjust: start_seq: %d->%d, end_seq: %d->%d\n",
+ ntohl(sack->start_seq), new_start_seq,
+ ntohl(sack->end_seq), new_end_seq);
+
+ nf_proto_csum_replace4(&tcph->check, skb,
+ sack->start_seq, new_start_seq, 0);
+ nf_proto_csum_replace4(&tcph->check, skb,
+ sack->end_seq, new_end_seq, 0);
+ sack->start_seq = new_start_seq;
+ sack->end_seq = new_end_seq;
+ sackoff += sizeof(*sack);
+ }
+}
+
+/* TCP SACK sequence number adjustment */
+static inline unsigned int
+nf_nat_sack_adjust(struct sk_buff **pskb,
+ struct tcphdr *tcph,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ unsigned int dir, optoff, optend;
+ struct nf_conn_nat *nat = nfct_nat(ct);
+
+ optoff = (*pskb)->nh.iph->ihl*4 + sizeof(struct tcphdr);
+ optend = (*pskb)->nh.iph->ihl*4 + tcph->doff*4;
+
+ if (!skb_make_writable(pskb, optend))
+ return 0;
+
+ dir = CTINFO2DIR(ctinfo);
+
+ while (optoff < optend) {
+ /* Usually: option, length. */
+ unsigned char *op = (*pskb)->data + optoff;
+
+ switch (op[0]) {
+ case TCPOPT_EOL:
+ return 1;
+ case TCPOPT_NOP:
+ optoff++;
+ continue;
+ default:
+ /* no partial options */
+ if (optoff + 1 == optend ||
+ optoff + op[1] > optend ||
+ op[1] < 2)
+ return 0;
+ if (op[0] == TCPOPT_SACK &&
+ op[1] >= 2+TCPOLEN_SACK_PERBLOCK &&
+ ((op[1] - 2) % TCPOLEN_SACK_PERBLOCK) == 0)
+ sack_adjust(*pskb, tcph, optoff+2,
+ optoff+op[1],
+ &nat->info.seq[!dir]);
+ optoff += op[1];
+ }
+ }
+ return 1;
+}
+
+/* TCP sequence number adjustment. Returns 1 on success, 0 on failure */
+int
+nf_nat_seq_adjust(struct sk_buff **pskb,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ struct tcphdr *tcph;
+ int dir;
+ __be32 newseq, newack;
+ struct nf_conn_nat *nat = nfct_nat(ct);
+ struct nf_nat_seq *this_way, *other_way;
+
+ dir = CTINFO2DIR(ctinfo);
+
+ this_way = &nat->info.seq[dir];
+ other_way = &nat->info.seq[!dir];
+
+ if (!skb_make_writable(pskb, (*pskb)->nh.iph->ihl*4+sizeof(*tcph)))
+ return 0;
+
+ tcph = (void *)(*pskb)->data + (*pskb)->nh.iph->ihl*4;
+ if (after(ntohl(tcph->seq), this_way->correction_pos))
+ newseq = htonl(ntohl(tcph->seq) + this_way->offset_after);
+ else
+ newseq = htonl(ntohl(tcph->seq) + this_way->offset_before);
+
+ if (after(ntohl(tcph->ack_seq) - other_way->offset_before,
+ other_way->correction_pos))
+ newack = htonl(ntohl(tcph->ack_seq) - other_way->offset_after);
+ else
+ newack = htonl(ntohl(tcph->ack_seq) - other_way->offset_before);
+
+ nf_proto_csum_replace4(&tcph->check, *pskb, tcph->seq, newseq, 0);
+ nf_proto_csum_replace4(&tcph->check, *pskb, tcph->ack_seq, newack, 0);
+
+ DEBUGP("Adjusting sequence number from %u->%u, ack from %u->%u\n",
+ ntohl(tcph->seq), ntohl(newseq), ntohl(tcph->ack_seq),
+ ntohl(newack));
+
+ tcph->seq = newseq;
+ tcph->ack_seq = newack;
+
+ if (!nf_nat_sack_adjust(pskb, tcph, ct, ctinfo))
+ return 0;
+
+ nf_conntrack_tcp_update(*pskb, (*pskb)->nh.iph->ihl*4, ct, dir);
+
+ return 1;
+}
+EXPORT_SYMBOL(nf_nat_seq_adjust);
+
+/* Setup NAT on this expected conntrack so it follows master. */
+/* If we fail to get a free NAT slot, we'll get dropped on confirm */
+void nf_nat_follow_master(struct nf_conn *ct,
+ struct nf_conntrack_expect *exp)
+{
+ struct nf_nat_range range;
+
+ /* This must be a fresh one. */
+ BUG_ON(ct->status & IPS_NAT_DONE_MASK);
+
+ /* Change src to where master sends to */
+ range.flags = IP_NAT_RANGE_MAP_IPS;
+ range.min_ip = range.max_ip
+ = ct->master->tuplehash[!exp->dir].tuple.dst.u3.ip;
+ /* hook doesn't matter, but it has to do source manip */
+ nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
+
+ /* For DST manip, map port here to where it's expected. */
+ range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED);
+ range.min = range.max = exp->saved_proto;
+ range.min_ip = range.max_ip
+ = ct->master->tuplehash[!exp->dir].tuple.src.u3.ip;
+ /* hook doesn't matter, but it has to do destination manip */
+ nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
+}
+EXPORT_SYMBOL(nf_nat_follow_master);
diff --git a/net/ipv4/netfilter/nf_nat_proto_icmp.c b/net/ipv4/netfilter/nf_nat_proto_icmp.c
new file mode 100644
index 0000000..dcfd772
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_proto_icmp.c
@@ -0,0 +1,86 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/ip.h>
+#include <linux/icmp.h>
+
+#include <linux/netfilter.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_nat_protocol.h>
+
+static int
+icmp_in_range(const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype,
+ const union nf_conntrack_man_proto *min,
+ const union nf_conntrack_man_proto *max)
+{
+ return ntohs(tuple->src.u.icmp.id) >= ntohs(min->icmp.id) &&
+ ntohs(tuple->src.u.icmp.id) <= ntohs(max->icmp.id);
+}
+
+static int
+icmp_unique_tuple(struct nf_conntrack_tuple *tuple,
+ const struct nf_nat_range *range,
+ enum nf_nat_manip_type maniptype,
+ const struct nf_conn *ct)
+{
+ static u_int16_t id;
+ unsigned int range_size;
+ unsigned int i;
+
+ range_size = ntohs(range->max.icmp.id) - ntohs(range->min.icmp.id) + 1;
+ /* If no range specified... */
+ if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED))
+ range_size = 0xFFFF;
+
+ for (i = 0; i < range_size; i++, id++) {
+ tuple->src.u.icmp.id = htons(ntohs(range->min.icmp.id) +
+ (id % range_size));
+ if (!nf_nat_used_tuple(tuple, ct))
+ return 1;
+ }
+ return 0;
+}
+
+static int
+icmp_manip_pkt(struct sk_buff **pskb,
+ unsigned int iphdroff,
+ const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype)
+{
+ struct iphdr *iph = (struct iphdr *)((*pskb)->data + iphdroff);
+ struct icmphdr *hdr;
+ unsigned int hdroff = iphdroff + iph->ihl*4;
+
+ if (!skb_make_writable(pskb, hdroff + sizeof(*hdr)))
+ return 0;
+
+ hdr = (struct icmphdr *)((*pskb)->data + hdroff);
+ nf_proto_csum_replace2(&hdr->checksum, *pskb,
+ hdr->un.echo.id, tuple->src.u.icmp.id, 0);
+ hdr->un.echo.id = tuple->src.u.icmp.id;
+ return 1;
+}
+
+struct nf_nat_protocol nf_nat_protocol_icmp = {
+ .name = "ICMP",
+ .protonum = IPPROTO_ICMP,
+ .me = THIS_MODULE,
+ .manip_pkt = icmp_manip_pkt,
+ .in_range = icmp_in_range,
+ .unique_tuple = icmp_unique_tuple,
+#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
+ defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
+ .range_to_nfattr = nf_nat_port_range_to_nfattr,
+ .nfattr_to_range = nf_nat_port_nfattr_to_range,
+#endif
+};
diff --git a/net/ipv4/netfilter/nf_nat_proto_tcp.c b/net/ipv4/netfilter/nf_nat_proto_tcp.c
new file mode 100644
index 0000000..7e26a7e
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_proto_tcp.c
@@ -0,0 +1,148 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/nfnetlink_conntrack.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_core.h>
+
+static int
+tcp_in_range(const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype,
+ const union nf_conntrack_man_proto *min,
+ const union nf_conntrack_man_proto *max)
+{
+ __be16 port;
+
+ if (maniptype == IP_NAT_MANIP_SRC)
+ port = tuple->src.u.tcp.port;
+ else
+ port = tuple->dst.u.tcp.port;
+
+ return ntohs(port) >= ntohs(min->tcp.port) &&
+ ntohs(port) <= ntohs(max->tcp.port);
+}
+
+static int
+tcp_unique_tuple(struct nf_conntrack_tuple *tuple,
+ const struct nf_nat_range *range,
+ enum nf_nat_manip_type maniptype,
+ const struct nf_conn *ct)
+{
+ static u_int16_t port;
+ __be16 *portptr;
+ unsigned int range_size, min, i;
+
+ if (maniptype == IP_NAT_MANIP_SRC)
+ portptr = &tuple->src.u.tcp.port;
+ else
+ portptr = &tuple->dst.u.tcp.port;
+
+ /* If no range specified... */
+ if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
+ /* If it's dst rewrite, can't change port */
+ if (maniptype == IP_NAT_MANIP_DST)
+ return 0;
+
+ /* Map privileged onto privileged. */
+ if (ntohs(*portptr) < 1024) {
+ /* Loose convention: >> 512 is credential passing */
+ if (ntohs(*portptr)<512) {
+ min = 1;
+ range_size = 511 - min + 1;
+ } else {
+ min = 600;
+ range_size = 1023 - min + 1;
+ }
+ } else {
+ min = 1024;
+ range_size = 65535 - 1024 + 1;
+ }
+ } else {
+ min = ntohs(range->min.tcp.port);
+ range_size = ntohs(range->max.tcp.port) - min + 1;
+ }
+
+ for (i = 0; i < range_size; i++, port++) {
+ *portptr = htons(min + port % range_size);
+ if (!nf_nat_used_tuple(tuple, ct))
+ return 1;
+ }
+ return 0;
+}
+
+static int
+tcp_manip_pkt(struct sk_buff **pskb,
+ unsigned int iphdroff,
+ const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype)
+{
+ struct iphdr *iph = (struct iphdr *)((*pskb)->data + iphdroff);
+ struct tcphdr *hdr;
+ unsigned int hdroff = iphdroff + iph->ihl*4;
+ __be32 oldip, newip;
+ __be16 *portptr, newport, oldport;
+ int hdrsize = 8; /* TCP connection tracking guarantees this much */
+
+ /* this could be a inner header returned in icmp packet; in such
+ cases we cannot update the checksum field since it is outside of
+ the 8 bytes of transport layer headers we are guaranteed */
+ if ((*pskb)->len >= hdroff + sizeof(struct tcphdr))
+ hdrsize = sizeof(struct tcphdr);
+
+ if (!skb_make_writable(pskb, hdroff + hdrsize))
+ return 0;
+
+ iph = (struct iphdr *)((*pskb)->data + iphdroff);
+ hdr = (struct tcphdr *)((*pskb)->data + hdroff);
+
+ if (maniptype == IP_NAT_MANIP_SRC) {
+ /* Get rid of src ip and src pt */
+ oldip = iph->saddr;
+ newip = tuple->src.u3.ip;
+ newport = tuple->src.u.tcp.port;
+ portptr = &hdr->source;
+ } else {
+ /* Get rid of dst ip and dst pt */
+ oldip = iph->daddr;
+ newip = tuple->dst.u3.ip;
+ newport = tuple->dst.u.tcp.port;
+ portptr = &hdr->dest;
+ }
+
+ oldport = *portptr;
+ *portptr = newport;
+
+ if (hdrsize < sizeof(*hdr))
+ return 1;
+
+ nf_proto_csum_replace4(&hdr->check, *pskb, oldip, newip, 1);
+ nf_proto_csum_replace2(&hdr->check, *pskb, oldport, newport, 0);
+ return 1;
+}
+
+struct nf_nat_protocol nf_nat_protocol_tcp = {
+ .name = "TCP",
+ .protonum = IPPROTO_TCP,
+ .me = THIS_MODULE,
+ .manip_pkt = tcp_manip_pkt,
+ .in_range = tcp_in_range,
+ .unique_tuple = tcp_unique_tuple,
+#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
+ defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
+ .range_to_nfattr = nf_nat_port_range_to_nfattr,
+ .nfattr_to_range = nf_nat_port_nfattr_to_range,
+#endif
+};
diff --git a/net/ipv4/netfilter/nf_nat_proto_udp.c b/net/ipv4/netfilter/nf_nat_proto_udp.c
new file mode 100644
index 0000000..ab0ce4c
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_proto_udp.c
@@ -0,0 +1,138 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+
+#include <linux/netfilter.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_nat_protocol.h>
+
+static int
+udp_in_range(const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype,
+ const union nf_conntrack_man_proto *min,
+ const union nf_conntrack_man_proto *max)
+{
+ __be16 port;
+
+ if (maniptype == IP_NAT_MANIP_SRC)
+ port = tuple->src.u.udp.port;
+ else
+ port = tuple->dst.u.udp.port;
+
+ return ntohs(port) >= ntohs(min->udp.port) &&
+ ntohs(port) <= ntohs(max->udp.port);
+}
+
+static int
+udp_unique_tuple(struct nf_conntrack_tuple *tuple,
+ const struct nf_nat_range *range,
+ enum nf_nat_manip_type maniptype,
+ const struct nf_conn *ct)
+{
+ static u_int16_t port;
+ __be16 *portptr;
+ unsigned int range_size, min, i;
+
+ if (maniptype == IP_NAT_MANIP_SRC)
+ portptr = &tuple->src.u.udp.port;
+ else
+ portptr = &tuple->dst.u.udp.port;
+
+ /* If no range specified... */
+ if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
+ /* If it's dst rewrite, can't change port */
+ if (maniptype == IP_NAT_MANIP_DST)
+ return 0;
+
+ if (ntohs(*portptr) < 1024) {
+ /* Loose convention: >> 512 is credential passing */
+ if (ntohs(*portptr)<512) {
+ min = 1;
+ range_size = 511 - min + 1;
+ } else {
+ min = 600;
+ range_size = 1023 - min + 1;
+ }
+ } else {
+ min = 1024;
+ range_size = 65535 - 1024 + 1;
+ }
+ } else {
+ min = ntohs(range->min.udp.port);
+ range_size = ntohs(range->max.udp.port) - min + 1;
+ }
+
+ for (i = 0; i < range_size; i++, port++) {
+ *portptr = htons(min + port % range_size);
+ if (!nf_nat_used_tuple(tuple, ct))
+ return 1;
+ }
+ return 0;
+}
+
+static int
+udp_manip_pkt(struct sk_buff **pskb,
+ unsigned int iphdroff,
+ const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype)
+{
+ struct iphdr *iph = (struct iphdr *)((*pskb)->data + iphdroff);
+ struct udphdr *hdr;
+ unsigned int hdroff = iphdroff + iph->ihl*4;
+ __be32 oldip, newip;
+ __be16 *portptr, newport;
+
+ if (!skb_make_writable(pskb, hdroff + sizeof(*hdr)))
+ return 0;
+
+ iph = (struct iphdr *)((*pskb)->data + iphdroff);
+ hdr = (struct udphdr *)((*pskb)->data + hdroff);
+
+ if (maniptype == IP_NAT_MANIP_SRC) {
+ /* Get rid of src ip and src pt */
+ oldip = iph->saddr;
+ newip = tuple->src.u3.ip;
+ newport = tuple->src.u.udp.port;
+ portptr = &hdr->source;
+ } else {
+ /* Get rid of dst ip and dst pt */
+ oldip = iph->daddr;
+ newip = tuple->dst.u3.ip;
+ newport = tuple->dst.u.udp.port;
+ portptr = &hdr->dest;
+ }
+ if (hdr->check || (*pskb)->ip_summed == CHECKSUM_PARTIAL) {
+ nf_proto_csum_replace4(&hdr->check, *pskb, oldip, newip, 1);
+ nf_proto_csum_replace2(&hdr->check, *pskb, *portptr, newport,
+ 0);
+ if (!hdr->check)
+ hdr->check = CSUM_MANGLED_0;
+ }
+ *portptr = newport;
+ return 1;
+}
+
+struct nf_nat_protocol nf_nat_protocol_udp = {
+ .name = "UDP",
+ .protonum = IPPROTO_UDP,
+ .me = THIS_MODULE,
+ .manip_pkt = udp_manip_pkt,
+ .in_range = udp_in_range,
+ .unique_tuple = udp_unique_tuple,
+#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
+ defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
+ .range_to_nfattr = nf_nat_port_range_to_nfattr,
+ .nfattr_to_range = nf_nat_port_nfattr_to_range,
+#endif
+};
diff --git a/net/ipv4/netfilter/nf_nat_proto_unknown.c b/net/ipv4/netfilter/nf_nat_proto_unknown.c
new file mode 100644
index 0000000..f50d020
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_proto_unknown.c
@@ -0,0 +1,54 @@
+/* The "unknown" protocol. This is what is used for protocols we
+ * don't understand. It's returned by ip_ct_find_proto().
+ */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+
+#include <linux/netfilter.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_nat_protocol.h>
+
+static int unknown_in_range(const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type manip_type,
+ const union nf_conntrack_man_proto *min,
+ const union nf_conntrack_man_proto *max)
+{
+ return 1;
+}
+
+static int unknown_unique_tuple(struct nf_conntrack_tuple *tuple,
+ const struct nf_nat_range *range,
+ enum nf_nat_manip_type maniptype,
+ const struct nf_conn *ct)
+{
+ /* Sorry: we can't help you; if it's not unique, we can't frob
+ anything. */
+ return 0;
+}
+
+static int
+unknown_manip_pkt(struct sk_buff **pskb,
+ unsigned int iphdroff,
+ const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype)
+{
+ return 1;
+}
+
+struct nf_nat_protocol nf_nat_unknown_protocol = {
+ .name = "unknown",
+ /* .me isn't set: getting a ref to this cannot fail. */
+ .manip_pkt = unknown_manip_pkt,
+ .in_range = unknown_in_range,
+ .unique_tuple = unknown_unique_tuple,
+};
diff --git a/net/ipv4/netfilter/nf_nat_rule.c b/net/ipv4/netfilter/nf_nat_rule.c
new file mode 100644
index 0000000..b868ee0
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_rule.c
@@ -0,0 +1,343 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* Everything about the rules for NAT. */
+#include <linux/types.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/skbuff.h>
+#include <linux/proc_fs.h>
+#include <net/checksum.h>
+#include <net/route.h>
+#include <linux/bitops.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_rule.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+#define NAT_VALID_HOOKS ((1<<NF_IP_PRE_ROUTING) | (1<<NF_IP_POST_ROUTING) | (1<<NF_IP_LOCAL_OUT))
+
+static struct
+{
+ struct ipt_replace repl;
+ struct ipt_standard entries[3];
+ struct ipt_error term;
+} nat_initial_table __initdata = {
+ .repl = {
+ .name = "nat",
+ .valid_hooks = NAT_VALID_HOOKS,
+ .num_entries = 4,
+ .size = sizeof(struct ipt_standard) * 3 + sizeof(struct ipt_error),
+ .hook_entry = {
+ [NF_IP_PRE_ROUTING] = 0,
+ [NF_IP_POST_ROUTING] = sizeof(struct ipt_standard),
+ [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
+ .underflow = {
+ [NF_IP_PRE_ROUTING] = 0,
+ [NF_IP_POST_ROUTING] = sizeof(struct ipt_standard),
+ [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
+ },
+ .entries = {
+ /* PRE_ROUTING */
+ {
+ .entry = {
+ .target_offset = sizeof(struct ipt_entry),
+ .next_offset = sizeof(struct ipt_standard),
+ },
+ .target = {
+ .target = {
+ .u = {
+ .target_size = IPT_ALIGN(sizeof(struct ipt_standard_target)),
+ },
+ },
+ .verdict = -NF_ACCEPT - 1,
+ },
+ },
+ /* POST_ROUTING */
+ {
+ .entry = {
+ .target_offset = sizeof(struct ipt_entry),
+ .next_offset = sizeof(struct ipt_standard),
+ },
+ .target = {
+ .target = {
+ .u = {
+ .target_size = IPT_ALIGN(sizeof(struct ipt_standard_target)),
+ },
+ },
+ .verdict = -NF_ACCEPT - 1,
+ },
+ },
+ /* LOCAL_OUT */
+ {
+ .entry = {
+ .target_offset = sizeof(struct ipt_entry),
+ .next_offset = sizeof(struct ipt_standard),
+ },
+ .target = {
+ .target = {
+ .u = {
+ .target_size = IPT_ALIGN(sizeof(struct ipt_standard_target)),
+ },
+ },
+ .verdict = -NF_ACCEPT - 1,
+ },
+ },
+ },
+ /* ERROR */
+ .term = {
+ .entry = {
+ .target_offset = sizeof(struct ipt_entry),
+ .next_offset = sizeof(struct ipt_error),
+ },
+ .target = {
+ .target = {
+ .u = {
+ .user = {
+ .target_size = IPT_ALIGN(sizeof(struct ipt_error_target)),
+ .name = IPT_ERROR_TARGET,
+ },
+ },
+ },
+ .errorname = "ERROR",
+ },
+ }
+};
+
+static struct ipt_table nat_table = {
+ .name = "nat",
+ .valid_hooks = NAT_VALID_HOOKS,
+ .lock = RW_LOCK_UNLOCKED,
+ .me = THIS_MODULE,
+ .af = AF_INET,
+};
+
+/* Source NAT */
+static unsigned int ipt_snat_target(struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ unsigned int hooknum,
+ const struct xt_target *target,
+ const void *targinfo)
+{
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+ const struct nf_nat_multi_range_compat *mr = targinfo;
+
+ NF_CT_ASSERT(hooknum == NF_IP_POST_ROUTING);
+
+ ct = nf_ct_get(*pskb, &ctinfo);
+
+ /* Connection must be valid and new. */
+ NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
+ ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY));
+ NF_CT_ASSERT(out);
+
+ return nf_nat_setup_info(ct, &mr->range[0], hooknum);
+}
+
+/* Before 2.6.11 we did implicit source NAT if required. Warn about change. */
+static void warn_if_extra_mangle(__be32 dstip, __be32 srcip)
+{
+ static int warned = 0;
+ struct flowi fl = { .nl_u = { .ip4_u = { .daddr = dstip } } };
+ struct rtable *rt;
+
+ if (ip_route_output_key(&rt, &fl) != 0)
+ return;
+
+ if (rt->rt_src != srcip && !warned) {
+ printk("NAT: no longer support implicit source local NAT\n");
+ printk("NAT: packet src %u.%u.%u.%u -> dst %u.%u.%u.%u\n",
+ NIPQUAD(srcip), NIPQUAD(dstip));
+ warned = 1;
+ }
+ ip_rt_put(rt);
+}
+
+static unsigned int ipt_dnat_target(struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ unsigned int hooknum,
+ const struct xt_target *target,
+ const void *targinfo)
+{
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+ const struct nf_nat_multi_range_compat *mr = targinfo;
+
+ NF_CT_ASSERT(hooknum == NF_IP_PRE_ROUTING ||
+ hooknum == NF_IP_LOCAL_OUT);
+
+ ct = nf_ct_get(*pskb, &ctinfo);
+
+ /* Connection must be valid and new. */
+ NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
+
+ if (hooknum == NF_IP_LOCAL_OUT &&
+ mr->range[0].flags & IP_NAT_RANGE_MAP_IPS)
+ warn_if_extra_mangle((*pskb)->nh.iph->daddr,
+ mr->range[0].min_ip);
+
+ return nf_nat_setup_info(ct, &mr->range[0], hooknum);
+}
+
+static int ipt_snat_checkentry(const char *tablename,
+ const void *entry,
+ const struct xt_target *target,
+ void *targinfo,
+ unsigned int hook_mask)
+{
+ struct nf_nat_multi_range_compat *mr = targinfo;
+
+ /* Must be a valid range */
+ if (mr->rangesize != 1) {
+ printk("SNAT: multiple ranges no longer supported\n");
+ return 0;
+ }
+ return 1;
+}
+
+static int ipt_dnat_checkentry(const char *tablename,
+ const void *entry,
+ const struct xt_target *target,
+ void *targinfo,
+ unsigned int hook_mask)
+{
+ struct nf_nat_multi_range_compat *mr = targinfo;
+
+ /* Must be a valid range */
+ if (mr->rangesize != 1) {
+ printk("DNAT: multiple ranges no longer supported\n");
+ return 0;
+ }
+ return 1;
+}
+
+inline unsigned int
+alloc_null_binding(struct nf_conn *ct,
+ struct nf_nat_info *info,
+ unsigned int hooknum)
+{
+ /* Force range to this IP; let proto decide mapping for
+ per-proto parts (hence not IP_NAT_RANGE_PROTO_SPECIFIED).
+ Use reply in case it's already been mangled (eg local packet).
+ */
+ __be32 ip
+ = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
+ ? ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip
+ : ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip);
+ struct nf_nat_range range
+ = { IP_NAT_RANGE_MAP_IPS, ip, ip, { 0 }, { 0 } };
+
+ DEBUGP("Allocating NULL binding for %p (%u.%u.%u.%u)\n",
+ ct, NIPQUAD(ip));
+ return nf_nat_setup_info(ct, &range, hooknum);
+}
+
+unsigned int
+alloc_null_binding_confirmed(struct nf_conn *ct,
+ struct nf_nat_info *info,
+ unsigned int hooknum)
+{
+ __be32 ip
+ = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
+ ? ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip
+ : ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip);
+ u_int16_t all
+ = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
+ ? ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u.all
+ : ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u.all);
+ struct nf_nat_range range
+ = { IP_NAT_RANGE_MAP_IPS, ip, ip, { all }, { all } };
+
+ DEBUGP("Allocating NULL binding for confirmed %p (%u.%u.%u.%u)\n",
+ ct, NIPQUAD(ip));
+ return nf_nat_setup_info(ct, &range, hooknum);
+}
+
+int nf_nat_rule_find(struct sk_buff **pskb,
+ unsigned int hooknum,
+ const struct net_device *in,
+ const struct net_device *out,
+ struct nf_conn *ct,
+ struct nf_nat_info *info)
+{
+ int ret;
+
+ ret = ipt_do_table(pskb, hooknum, in, out, &nat_table);
+
+ if (ret == NF_ACCEPT) {
+ if (!nf_nat_initialized(ct, HOOK2MANIP(hooknum)))
+ /* NUL mapping */
+ ret = alloc_null_binding(ct, info, hooknum);
+ }
+ return ret;
+}
+
+static struct ipt_target ipt_snat_reg = {
+ .name = "SNAT",
+ .target = ipt_snat_target,
+ .targetsize = sizeof(struct nf_nat_multi_range_compat),
+ .table = "nat",
+ .hooks = 1 << NF_IP_POST_ROUTING,
+ .checkentry = ipt_snat_checkentry,
+ .family = AF_INET,
+};
+
+static struct xt_target ipt_dnat_reg = {
+ .name = "DNAT",
+ .target = ipt_dnat_target,
+ .targetsize = sizeof(struct nf_nat_multi_range_compat),
+ .table = "nat",
+ .hooks = (1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_OUT),
+ .checkentry = ipt_dnat_checkentry,
+ .family = AF_INET,
+};
+
+int __init nf_nat_rule_init(void)
+{
+ int ret;
+
+ ret = ipt_register_table(&nat_table, &nat_initial_table.repl);
+ if (ret != 0)
+ return ret;
+ ret = xt_register_target(&ipt_snat_reg);
+ if (ret != 0)
+ goto unregister_table;
+
+ ret = xt_register_target(&ipt_dnat_reg);
+ if (ret != 0)
+ goto unregister_snat;
+
+ return ret;
+
+ unregister_snat:
+ xt_unregister_target(&ipt_snat_reg);
+ unregister_table:
+ ipt_unregister_table(&nat_table);
+
+ return ret;
+}
+
+void nf_nat_rule_cleanup(void)
+{
+ xt_unregister_target(&ipt_dnat_reg);
+ xt_unregister_target(&ipt_snat_reg);
+ ipt_unregister_table(&nat_table);
+}
diff --git a/net/ipv4/netfilter/nf_nat_standalone.c b/net/ipv4/netfilter/nf_nat_standalone.c
new file mode 100644
index 0000000..730a7a4
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_standalone.c
@@ -0,0 +1,406 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/types.h>
+#include <linux/icmp.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/proc_fs.h>
+#include <net/ip.h>
+#include <net/checksum.h>
+#include <linux/spinlock.h>
+
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_helper.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+#define HOOKNAME(hooknum) ((hooknum) == NF_IP_POST_ROUTING ? "POST_ROUTING" \
+ : ((hooknum) == NF_IP_PRE_ROUTING ? "PRE_ROUTING" \
+ : ((hooknum) == NF_IP_LOCAL_OUT ? "LOCAL_OUT" \
+ : ((hooknum) == NF_IP_LOCAL_IN ? "LOCAL_IN" \
+ : "*ERROR*")))
+
+#ifdef CONFIG_XFRM
+static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
+{
+ struct nf_conn *ct;
+ struct nf_conntrack_tuple *t;
+ enum ip_conntrack_info ctinfo;
+ enum ip_conntrack_dir dir;
+ unsigned long statusbit;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ if (ct == NULL)
+ return;
+ dir = CTINFO2DIR(ctinfo);
+ t = &ct->tuplehash[dir].tuple;
+
+ if (dir == IP_CT_DIR_ORIGINAL)
+ statusbit = IPS_DST_NAT;
+ else
+ statusbit = IPS_SRC_NAT;
+
+ if (ct->status & statusbit) {
+ fl->fl4_dst = t->dst.u3.ip;
+ if (t->dst.protonum == IPPROTO_TCP ||
+ t->dst.protonum == IPPROTO_UDP)
+ fl->fl_ip_dport = t->dst.u.tcp.port;
+ }
+
+ statusbit ^= IPS_NAT_MASK;
+
+ if (ct->status & statusbit) {
+ fl->fl4_src = t->src.u3.ip;
+ if (t->dst.protonum == IPPROTO_TCP ||
+ t->dst.protonum == IPPROTO_UDP)
+ fl->fl_ip_sport = t->src.u.tcp.port;
+ }
+}
+#endif
+
+static unsigned int
+nf_nat_fn(unsigned int hooknum,
+ struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn_nat *nat;
+ struct nf_nat_info *info;
+ /* maniptype == SRC for postrouting. */
+ enum nf_nat_manip_type maniptype = HOOK2MANIP(hooknum);
+
+ /* We never see fragments: conntrack defrags on pre-routing
+ and local-out, and nf_nat_out protects post-routing. */
+ NF_CT_ASSERT(!((*pskb)->nh.iph->frag_off
+ & htons(IP_MF|IP_OFFSET)));
+
+ ct = nf_ct_get(*pskb, &ctinfo);
+ /* Can't track? It's not due to stress, or conntrack would
+ have dropped it. Hence it's the user's responsibilty to
+ packet filter it out, or implement conntrack/NAT for that
+ protocol. 8) --RR */
+ if (!ct) {
+ /* Exception: ICMP redirect to new connection (not in
+ hash table yet). We must not let this through, in
+ case we're doing NAT to the same network. */
+ if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
+ struct icmphdr _hdr, *hp;
+
+ hp = skb_header_pointer(*pskb,
+ (*pskb)->nh.iph->ihl*4,
+ sizeof(_hdr), &_hdr);
+ if (hp != NULL &&
+ hp->type == ICMP_REDIRECT)
+ return NF_DROP;
+ }
+ return NF_ACCEPT;
+ }
+
+ /* Don't try to NAT if this packet is not conntracked */
+ if (ct == &nf_conntrack_untracked)
+ return NF_ACCEPT;
+
+ nat = nfct_nat(ct);
+ if (!nat)
+ return NF_DROP;
+
+ switch (ctinfo) {
+ case IP_CT_RELATED:
+ case IP_CT_RELATED+IP_CT_IS_REPLY:
+ if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
+ if (!nf_nat_icmp_reply_translation(ct, ctinfo,
+ hooknum, pskb))
+ return NF_DROP;
+ else
+ return NF_ACCEPT;
+ }
+ /* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
+ case IP_CT_NEW:
+ info = &nat->info;
+
+ /* Seen it before? This can happen for loopback, retrans,
+ or local packets.. */
+ if (!nf_nat_initialized(ct, maniptype)) {
+ unsigned int ret;
+
+ if (unlikely(nf_ct_is_confirmed(ct)))
+ /* NAT module was loaded late */
+ ret = alloc_null_binding_confirmed(ct, info,
+ hooknum);
+ else if (hooknum == NF_IP_LOCAL_IN)
+ /* LOCAL_IN hook doesn't have a chain! */
+ ret = alloc_null_binding(ct, info, hooknum);
+ else
+ ret = nf_nat_rule_find(pskb, hooknum, in, out,
+ ct, info);
+
+ if (ret != NF_ACCEPT) {
+ return ret;
+ }
+ } else
+ DEBUGP("Already setup manip %s for ct %p\n",
+ maniptype == IP_NAT_MANIP_SRC ? "SRC" : "DST",
+ ct);
+ break;
+
+ default:
+ /* ESTABLISHED */
+ NF_CT_ASSERT(ctinfo == IP_CT_ESTABLISHED ||
+ ctinfo == (IP_CT_ESTABLISHED+IP_CT_IS_REPLY));
+ info = &nat->info;
+ }
+
+ NF_CT_ASSERT(info);
+ return nf_nat_packet(ct, ctinfo, hooknum, pskb);
+}
+
+static unsigned int
+nf_nat_in(unsigned int hooknum,
+ struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ unsigned int ret;
+ __be32 daddr = (*pskb)->nh.iph->daddr;
+
+ ret = nf_nat_fn(hooknum, pskb, in, out, okfn);
+ if (ret != NF_DROP && ret != NF_STOLEN &&
+ daddr != (*pskb)->nh.iph->daddr) {
+ dst_release((*pskb)->dst);
+ (*pskb)->dst = NULL;
+ }
+ return ret;
+}
+
+static unsigned int
+nf_nat_out(unsigned int hooknum,
+ struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+#ifdef CONFIG_XFRM
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+#endif
+ unsigned int ret;
+
+ /* root is playing with raw sockets. */
+ if ((*pskb)->len < sizeof(struct iphdr) ||
+ (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
+ return NF_ACCEPT;
+
+ ret = nf_nat_fn(hooknum, pskb, in, out, okfn);
+#ifdef CONFIG_XFRM
+ if (ret != NF_DROP && ret != NF_STOLEN &&
+ (ct = nf_ct_get(*pskb, &ctinfo)) != NULL) {
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+
+ if (ct->tuplehash[dir].tuple.src.u3.ip !=
+ ct->tuplehash[!dir].tuple.dst.u3.ip
+ || ct->tuplehash[dir].tuple.src.u.all !=
+ ct->tuplehash[!dir].tuple.dst.u.all
+ )
+ return ip_xfrm_me_harder(pskb) == 0 ? ret : NF_DROP;
+ }
+#endif
+ return ret;
+}
+
+static unsigned int
+nf_nat_local_fn(unsigned int hooknum,
+ struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+ unsigned int ret;
+
+ /* root is playing with raw sockets. */
+ if ((*pskb)->len < sizeof(struct iphdr) ||
+ (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
+ return NF_ACCEPT;
+
+ ret = nf_nat_fn(hooknum, pskb, in, out, okfn);
+ if (ret != NF_DROP && ret != NF_STOLEN &&
+ (ct = nf_ct_get(*pskb, &ctinfo)) != NULL) {
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+
+ if (ct->tuplehash[dir].tuple.dst.u3.ip !=
+ ct->tuplehash[!dir].tuple.src.u3.ip
+#ifdef CONFIG_XFRM
+ || ct->tuplehash[dir].tuple.dst.u.all !=
+ ct->tuplehash[!dir].tuple.src.u.all
+#endif
+ )
+ if (ip_route_me_harder(pskb, RTN_UNSPEC))
+ ret = NF_DROP;
+ }
+ return ret;
+}
+
+static unsigned int
+nf_nat_adjust(unsigned int hooknum,
+ struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+
+ ct = nf_ct_get(*pskb, &ctinfo);
+ if (ct && test_bit(IPS_SEQ_ADJUST_BIT, &ct->status)) {
+ DEBUGP("nf_nat_standalone: adjusting sequence number\n");
+ if (!nf_nat_seq_adjust(pskb, ct, ctinfo))
+ return NF_DROP;
+ }
+ return NF_ACCEPT;
+}
+
+/* We must be after connection tracking and before packet filtering. */
+
+static struct nf_hook_ops nf_nat_ops[] = {
+ /* Before packet filtering, change destination */
+ {
+ .hook = nf_nat_in,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_IP_PRE_ROUTING,
+ .priority = NF_IP_PRI_NAT_DST,
+ },
+ /* After packet filtering, change source */
+ {
+ .hook = nf_nat_out,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_IP_POST_ROUTING,
+ .priority = NF_IP_PRI_NAT_SRC,
+ },
+ /* After conntrack, adjust sequence number */
+ {
+ .hook = nf_nat_adjust,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_IP_POST_ROUTING,
+ .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
+ },
+ /* Before packet filtering, change destination */
+ {
+ .hook = nf_nat_local_fn,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_IP_LOCAL_OUT,
+ .priority = NF_IP_PRI_NAT_DST,
+ },
+ /* After packet filtering, change source */
+ {
+ .hook = nf_nat_fn,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_IP_LOCAL_IN,
+ .priority = NF_IP_PRI_NAT_SRC,
+ },
+ /* After conntrack, adjust sequence number */
+ {
+ .hook = nf_nat_adjust,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_IP_LOCAL_IN,
+ .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
+ },
+};
+
+static int __init nf_nat_standalone_init(void)
+{
+ int size, ret = 0;
+
+ need_conntrack();
+
+ size = ALIGN(sizeof(struct nf_conn), __alignof__(struct nf_conn_nat)) +
+ sizeof(struct nf_conn_nat);
+ ret = nf_conntrack_register_cache(NF_CT_F_NAT, "nf_nat:base", size);
+ if (ret < 0) {
+ printk(KERN_ERR "nf_nat_init: Unable to create slab cache\n");
+ return ret;
+ }
+
+ size = ALIGN(size, __alignof__(struct nf_conn_help)) +
+ sizeof(struct nf_conn_help);
+ ret = nf_conntrack_register_cache(NF_CT_F_NAT|NF_CT_F_HELP,
+ "nf_nat:help", size);
+ if (ret < 0) {
+ printk(KERN_ERR "nf_nat_init: Unable to create slab cache\n");
+ goto cleanup_register_cache;
+ }
+#ifdef CONFIG_XFRM
+ BUG_ON(ip_nat_decode_session != NULL);
+ ip_nat_decode_session = nat_decode_session;
+#endif
+ ret = nf_nat_rule_init();
+ if (ret < 0) {
+ printk("nf_nat_init: can't setup rules.\n");
+ goto cleanup_decode_session;
+ }
+ ret = nf_register_hooks(nf_nat_ops, ARRAY_SIZE(nf_nat_ops));
+ if (ret < 0) {
+ printk("nf_nat_init: can't register hooks.\n");
+ goto cleanup_rule_init;
+ }
+ nf_nat_module_is_loaded = 1;
+ return ret;
+
+ cleanup_rule_init:
+ nf_nat_rule_cleanup();
+ cleanup_decode_session:
+#ifdef CONFIG_XFRM
+ ip_nat_decode_session = NULL;
+ synchronize_net();
+#endif
+ nf_conntrack_unregister_cache(NF_CT_F_NAT|NF_CT_F_HELP);
+ cleanup_register_cache:
+ nf_conntrack_unregister_cache(NF_CT_F_NAT);
+ return ret;
+}
+
+static void __exit nf_nat_standalone_fini(void)
+{
+ nf_unregister_hooks(nf_nat_ops, ARRAY_SIZE(nf_nat_ops));
+ nf_nat_rule_cleanup();
+ nf_nat_module_is_loaded = 0;
+#ifdef CONFIG_XFRM
+ ip_nat_decode_session = NULL;
+ synchronize_net();
+#endif
+ /* Conntrack caches are unregistered in nf_conntrack_cleanup */
+}
+
+module_init(nf_nat_standalone_init);
+module_exit(nf_nat_standalone_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ip_nat");
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index f952a7f..aa8beab 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -579,7 +579,8 @@ __nf_conntrack_alloc(const struct nf_con
/* FIXME: protect helper list per RCU */
read_lock_bh(&nf_conntrack_lock);
helper = __nf_ct_helper_find(repl);
- if (helper)
+ /* NAT might want to assign a helper later */
+ if (helper || features & NF_CT_F_NAT)
features |= NF_CT_F_HELP;
read_unlock_bh(&nf_conntrack_lock);
@@ -850,6 +851,26 @@ int nf_ct_invert_tuplepr(struct nf_connt
orig->dst.protonum));
}
+/* Alter reply tuple (maybe alter helper). This is for NAT, and is
+ implicitly racy: see __nf_conntrack_confirm */
+void nf_conntrack_alter_reply(struct nf_conn *ct,
+ const struct nf_conntrack_tuple *newreply)
+{
+ struct nf_conn_help *help = nfct_help(ct);
+
+ write_lock_bh(&nf_conntrack_lock);
+ /* Should be unconfirmed, so not in hash table yet */
+ NF_CT_ASSERT(!nf_ct_is_confirmed(ct));
+
+ DEBUGP("Altering reply tuple of %p to ", ct);
+ NF_CT_DUMP_TUPLE(newreply);
+
+ ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
+ if (!ct->master && help && help->expecting == 0)
+ help->helper = __nf_ct_helper_find(newreply);
+ write_unlock_bh(&nf_conntrack_lock);
+}
+
/* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */
void __nf_ct_refresh_acct(struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index f9c8ddd..bd1d2de 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -39,7 +39,11 @@ #include <net/netfilter/nf_conntrack_exp
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
-#include <linux/netfilter_ipv4/ip_nat_protocol.h>
+#include <net/netfilter/nf_conntrack_tuple.h>
+#ifdef CONFIG_NF_NAT_NEEDED
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_protocol.h>
+#endif
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
@@ -430,7 +434,7 @@ ctnetlink_dump_table(struct sk_buff *skb
restart:
list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
h = (struct nf_conntrack_tuple_hash *) i;
- if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
+ if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
continue;
ct = nf_ct_tuplehash_to_ctrack(h);
/* Dump entries of a given L3 protocol number.
@@ -556,28 +560,28 @@ ctnetlink_parse_tuple(struct nfattr *cda
return 0;
}
-#ifdef CONFIG_IP_NF_NAT_NEEDED
+#ifdef CONFIG_NF_NAT_NEEDED
static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
[CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
[CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
};
-static int ctnetlink_parse_nat_proto(struct nfattr *attr,
+static int nfnetlink_parse_nat_proto(struct nfattr *attr,
const struct nf_conn *ct,
- struct ip_nat_range *range)
+ struct nf_nat_range *range)
{
struct nfattr *tb[CTA_PROTONAT_MAX];
- struct ip_nat_protocol *npt;
+ struct nf_nat_protocol *npt;
nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
return -EINVAL;
- npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
+ npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
if (!npt->nfattr_to_range) {
- ip_nat_proto_put(npt);
+ nf_nat_proto_put(npt);
return 0;
}
@@ -585,7 +589,7 @@ static int ctnetlink_parse_nat_proto(str
if (npt->nfattr_to_range(tb, range) > 0)
range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
- ip_nat_proto_put(npt);
+ nf_nat_proto_put(npt);
return 0;
}
@@ -596,8 +600,8 @@ static const size_t cta_min_nat[CTA_NAT_
};
static inline int
-ctnetlink_parse_nat(struct nfattr *nat,
- const struct nf_conn *ct, struct ip_nat_range *range)
+nfnetlink_parse_nat(struct nfattr *nat,
+ const struct nf_conn *ct, struct nf_nat_range *range)
{
struct nfattr *tb[CTA_NAT_MAX];
int err;
@@ -623,7 +627,7 @@ ctnetlink_parse_nat(struct nfattr *nat,
if (!tb[CTA_NAT_PROTO-1])
return 0;
- err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
+ err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
if (err < 0)
return err;
@@ -798,35 +802,35 @@ ctnetlink_change_status(struct nf_conn *
return -EINVAL;
if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
-#ifndef CONFIG_IP_NF_NAT_NEEDED
+#ifndef CONFIG_NF_NAT_NEEDED
return -EINVAL;
#else
- struct ip_nat_range range;
+ struct nf_nat_range range;
if (cda[CTA_NAT_DST-1]) {
- if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
+ if (nfnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
&range) < 0)
return -EINVAL;
- if (ip_nat_initialized(ct,
+ if (nf_nat_initialized(ct,
HOOK2MANIP(NF_IP_PRE_ROUTING)))
return -EEXIST;
- ip_nat_setup_info(ct, &range, hooknum);
+ nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
}
if (cda[CTA_NAT_SRC-1]) {
- if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
+ if (nfnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
&range) < 0)
return -EINVAL;
- if (ip_nat_initialized(ct,
+ if (nf_nat_initialized(ct,
HOOK2MANIP(NF_IP_POST_ROUTING)))
return -EEXIST;
- ip_nat_setup_info(ct, &range, hooknum);
+ nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
}
#endif
}
/* Be careful here, modifying NAT bits can screw up things,
* so don't let users modify them directly if they don't pass
- * ip_nat_range. */
+ * nf_nat_range. */
ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
return 0;
}
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 71f492f..8156e42 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -730,7 +730,7 @@ static int tcp_in_window(struct ip_ct_tc
return res;
}
-#ifdef CONFIG_IP_NF_NAT_NEEDED
+#ifdef CONFIG_NF_NAT_NEEDED
/* Update sender->td_end after NAT successfully mangled the packet */
/* Caller must linearize skb at tcp header. */
void nf_conntrack_tcp_update(struct sk_buff *skb,
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index be94b63..3f56a3a 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -530,8 +530,11 @@ EXPORT_SYMBOL(nf_conntrack_lock);
EXPORT_SYMBOL(nf_conntrack_hash);
EXPORT_SYMBOL(nf_conntrack_untracked);
EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
-#ifdef CONFIG_IP_NF_NAT_NEEDED
+#ifdef CONFIG_NF_NAT_NEEDED
EXPORT_SYMBOL(nf_conntrack_tcp_update);
+EXPORT_SYMBOL(nf_conntrack_register_cache);
+EXPORT_SYMBOL(nf_conntrack_unregister_cache);
+EXPORT_SYMBOL(nf_conntrack_alter_reply);
#endif
EXPORT_SYMBOL(__nf_conntrack_confirm);
EXPORT_SYMBOL(nf_ct_get_tuple);
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 09/20]: nf_nat: add FTP NAT helper port
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (7 preceding siblings ...)
2006-12-02 14:49 ` [NETFILTER 08/20]: Add NAT support for nf_conntrack Patrick McHardy
@ 2006-12-02 14:49 ` Patrick McHardy
2006-12-02 14:49 ` [NETFILTER 10/20]: nf_conntrack: add helper function for expectation initialization Patrick McHardy
` (11 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:49 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_nat: add FTP NAT helper port
Add FTP NAT helper.
Split out from Jozsef's big nf_nat patch with a few small fixes by myself.
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit c36fe54cbb2515da933901095b4df503d9943bfd
tree bbf545c88377c653114b4fb759e3e52438690962
parent 1c341bc77a3d189d65ce0455640ac03a1dc293da
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:05 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:05 +0100
include/linux/netfilter/nf_conntrack_ftp.h | 20 +--
include/linux/netfilter_ipv4/ip_conntrack_ftp.h | 40 +++++
include/net/netfilter/nf_conntrack.h | 2
net/ipv4/netfilter/Kconfig | 25 ++-
net/ipv4/netfilter/Makefile | 5 +
net/ipv4/netfilter/nf_nat_ftp.c | 179 +++++++++++++++++++++++
net/netfilter/nf_conntrack_ftp.c | 20 +--
7 files changed, 260 insertions(+), 31 deletions(-)
diff --git a/include/linux/netfilter/nf_conntrack_ftp.h b/include/linux/netfilter/nf_conntrack_ftp.h
index ad4a41c..81453ea 100644
--- a/include/linux/netfilter/nf_conntrack_ftp.h
+++ b/include/linux/netfilter/nf_conntrack_ftp.h
@@ -3,16 +3,16 @@ #define _NF_CONNTRACK_FTP_H
/* FTP tracking. */
/* This enum is exposed to userspace */
-enum ip_ct_ftp_type
+enum nf_ct_ftp_type
{
/* PORT command from client */
- IP_CT_FTP_PORT,
+ NF_CT_FTP_PORT,
/* PASV response from server */
- IP_CT_FTP_PASV,
+ NF_CT_FTP_PASV,
/* EPRT command from client */
- IP_CT_FTP_EPRT,
+ NF_CT_FTP_EPRT,
/* EPSV response from server */
- IP_CT_FTP_EPSV,
+ NF_CT_FTP_EPSV,
};
#ifdef __KERNEL__
@@ -21,23 +21,23 @@ #define FTP_PORT 21
#define NUM_SEQ_TO_REMEMBER 2
/* This structure exists only once per master */
-struct ip_ct_ftp_master {
+struct nf_ct_ftp_master {
/* Valid seq positions for cmd matching after newline */
u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
/* 0 means seq_match_aft_nl not set */
int seq_aft_nl_num[IP_CT_DIR_MAX];
};
-struct ip_conntrack_expect;
+struct nf_conntrack_expect;
/* For NAT to hook in when we find a packet which describes what other
* connection we should expect. */
-extern unsigned int (*ip_nat_ftp_hook)(struct sk_buff **pskb,
+extern unsigned int (*nf_nat_ftp_hook)(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
- enum ip_ct_ftp_type type,
+ enum nf_ct_ftp_type type,
unsigned int matchoff,
unsigned int matchlen,
- struct ip_conntrack_expect *exp,
+ struct nf_conntrack_expect *exp,
u32 *seq);
#endif /* __KERNEL__ */
diff --git a/include/linux/netfilter_ipv4/ip_conntrack_ftp.h b/include/linux/netfilter_ipv4/ip_conntrack_ftp.h
index 6381193..2129fc3 100644
--- a/include/linux/netfilter_ipv4/ip_conntrack_ftp.h
+++ b/include/linux/netfilter_ipv4/ip_conntrack_ftp.h
@@ -1,6 +1,44 @@
#ifndef _IP_CONNTRACK_FTP_H
#define _IP_CONNTRACK_FTP_H
+/* FTP tracking. */
-#include <linux/netfilter/nf_conntrack_ftp.h>
+/* This enum is exposed to userspace */
+enum ip_ct_ftp_type
+{
+ /* PORT command from client */
+ IP_CT_FTP_PORT,
+ /* PASV response from server */
+ IP_CT_FTP_PASV,
+ /* EPRT command from client */
+ IP_CT_FTP_EPRT,
+ /* EPSV response from server */
+ IP_CT_FTP_EPSV,
+};
+
+#ifdef __KERNEL__
+
+#define FTP_PORT 21
+
+#define NUM_SEQ_TO_REMEMBER 2
+/* This structure exists only once per master */
+struct ip_ct_ftp_master {
+ /* Valid seq positions for cmd matching after newline */
+ u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
+ /* 0 means seq_match_aft_nl not set */
+ int seq_aft_nl_num[IP_CT_DIR_MAX];
+};
+
+struct ip_conntrack_expect;
+
+/* For NAT to hook in when we find a packet which describes what other
+ * connection we should expect. */
+extern unsigned int (*ip_nat_ftp_hook)(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ enum ip_ct_ftp_type type,
+ unsigned int matchoff,
+ unsigned int matchlen,
+ struct ip_conntrack_expect *exp,
+ u32 *seq);
+#endif /* __KERNEL__ */
#endif /* _IP_CONNTRACK_FTP_H */
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 9948af0..83694cf 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -45,7 +45,7 @@ #include <linux/netfilter/nf_conntrack_f
/* per conntrack: application helper private data */
union nf_conntrack_help {
/* insert conntrack helper private data (master) here */
- struct ip_ct_ftp_master ct_ftp_info;
+ struct nf_ct_ftp_master ct_ftp_info;
};
#include <linux/types.h>
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 01789ae..52f876d 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -477,20 +477,29 @@ config IP_NF_NAT_SNMP_BASIC
To compile it as a module, choose M here. If unsure, say N.
+# If they want FTP, set to $CONFIG_IP_NF_NAT (m or y),
+# or $CONFIG_IP_NF_FTP (m or y), whichever is weaker.
+# From kconfig-language.txt:
+#
+# <expr> '&&' <expr> (6)
+#
+# (6) Returns the result of min(/expr/, /expr/).
+config IP_NF_NAT_FTP
+ tristate
+ depends on IP_NF_IPTABLES && IP_NF_CONNTRACK && IP_NF_NAT
+ default IP_NF_NAT && IP_NF_FTP
+
+config NF_NAT_FTP
+ tristate
+ depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
+ default NF_NAT && NF_CONNTRACK_FTP
+
config IP_NF_NAT_IRC
tristate
depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
default IP_NF_NAT if IP_NF_IRC=y
default m if IP_NF_IRC=m
-# If they want FTP, set to $CONFIG_IP_NF_NAT (m or y),
-# or $CONFIG_IP_NF_FTP (m or y), whichever is weaker. Argh.
-config IP_NF_NAT_FTP
- tristate
- depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
- default IP_NF_NAT if IP_NF_FTP=y
- default m if IP_NF_FTP=m
-
config IP_NF_NAT_TFTP
tristate
depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index ec31690..c0c6194 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -40,7 +40,7 @@ obj-$(CONFIG_IP_NF_IRC) += ip_conntrack_
obj-$(CONFIG_IP_NF_SIP) += ip_conntrack_sip.o
obj-$(CONFIG_IP_NF_NETBIOS_NS) += ip_conntrack_netbios_ns.o
-# NAT helpers
+# NAT helpers (ip_conntrack)
obj-$(CONFIG_IP_NF_NAT_H323) += ip_nat_h323.o
obj-$(CONFIG_IP_NF_NAT_PPTP) += ip_nat_pptp.o
obj-$(CONFIG_IP_NF_NAT_AMANDA) += ip_nat_amanda.o
@@ -49,6 +49,9 @@ obj-$(CONFIG_IP_NF_NAT_FTP) += ip_nat_ft
obj-$(CONFIG_IP_NF_NAT_IRC) += ip_nat_irc.o
obj-$(CONFIG_IP_NF_NAT_SIP) += ip_nat_sip.o
+# NAT helpers (nf_conntrack)
+obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
+
# generic IP tables
obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
diff --git a/net/ipv4/netfilter/nf_nat_ftp.c b/net/ipv4/netfilter/nf_nat_ftp.c
new file mode 100644
index 0000000..751b598
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_ftp.c
@@ -0,0 +1,179 @@
+/* FTP extension for TCP NAT alteration. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/netfilter_ipv4.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_helper.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <linux/netfilter/nf_conntrack_ftp.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
+MODULE_DESCRIPTION("ftp NAT helper");
+MODULE_ALIAS("ip_nat_ftp");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+/* FIXME: Time out? --RR */
+
+static int
+mangle_rfc959_packet(struct sk_buff **pskb,
+ __be32 newip,
+ u_int16_t port,
+ unsigned int matchoff,
+ unsigned int matchlen,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ u32 *seq)
+{
+ char buffer[sizeof("nnn,nnn,nnn,nnn,nnn,nnn")];
+
+ sprintf(buffer, "%u,%u,%u,%u,%u,%u",
+ NIPQUAD(newip), port>>8, port&0xFF);
+
+ DEBUGP("calling nf_nat_mangle_tcp_packet\n");
+
+ *seq += strlen(buffer) - matchlen;
+ return nf_nat_mangle_tcp_packet(pskb, ct, ctinfo, matchoff,
+ matchlen, buffer, strlen(buffer));
+}
+
+/* |1|132.235.1.2|6275| */
+static int
+mangle_eprt_packet(struct sk_buff **pskb,
+ __be32 newip,
+ u_int16_t port,
+ unsigned int matchoff,
+ unsigned int matchlen,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ u32 *seq)
+{
+ char buffer[sizeof("|1|255.255.255.255|65535|")];
+
+ sprintf(buffer, "|1|%u.%u.%u.%u|%u|", NIPQUAD(newip), port);
+
+ DEBUGP("calling nf_nat_mangle_tcp_packet\n");
+
+ *seq += strlen(buffer) - matchlen;
+ return nf_nat_mangle_tcp_packet(pskb, ct, ctinfo, matchoff,
+ matchlen, buffer, strlen(buffer));
+}
+
+/* |1|132.235.1.2|6275| */
+static int
+mangle_epsv_packet(struct sk_buff **pskb,
+ __be32 newip,
+ u_int16_t port,
+ unsigned int matchoff,
+ unsigned int matchlen,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ u32 *seq)
+{
+ char buffer[sizeof("|||65535|")];
+
+ sprintf(buffer, "|||%u|", port);
+
+ DEBUGP("calling nf_nat_mangle_tcp_packet\n");
+
+ *seq += strlen(buffer) - matchlen;
+ return nf_nat_mangle_tcp_packet(pskb, ct, ctinfo, matchoff,
+ matchlen, buffer, strlen(buffer));
+}
+
+static int (*mangle[])(struct sk_buff **, __be32, u_int16_t,
+ unsigned int, unsigned int, struct nf_conn *,
+ enum ip_conntrack_info, u32 *seq)
+= {
+ [NF_CT_FTP_PORT] = mangle_rfc959_packet,
+ [NF_CT_FTP_PASV] = mangle_rfc959_packet,
+ [NF_CT_FTP_EPRT] = mangle_eprt_packet,
+ [NF_CT_FTP_EPSV] = mangle_epsv_packet
+};
+
+/* So, this packet has hit the connection tracking matching code.
+ Mangle it, and change the expectation to match the new version. */
+static unsigned int nf_nat_ftp(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ enum nf_ct_ftp_type type,
+ unsigned int matchoff,
+ unsigned int matchlen,
+ struct nf_conntrack_expect *exp,
+ u32 *seq)
+{
+ __be32 newip;
+ u_int16_t port;
+ int dir = CTINFO2DIR(ctinfo);
+ struct nf_conn *ct = exp->master;
+
+ DEBUGP("FTP_NAT: type %i, off %u len %u\n", type, matchoff, matchlen);
+
+ /* Connection will come from wherever this packet goes, hence !dir */
+ newip = ct->tuplehash[!dir].tuple.dst.u3.ip;
+ exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
+ exp->dir = !dir;
+
+ /* When you see the packet, we need to NAT it the same as the
+ * this one. */
+ exp->expectfn = nf_nat_follow_master;
+
+ /* Try to get same port: if not, try to change it. */
+ for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
+ exp->tuple.dst.u.tcp.port = htons(port);
+ if (nf_conntrack_expect_related(exp) == 0)
+ break;
+ }
+
+ if (port == 0)
+ return NF_DROP;
+
+ if (!mangle[type](pskb, newip, port, matchoff, matchlen, ct, ctinfo,
+ seq)) {
+ nf_conntrack_unexpect_related(exp);
+ return NF_DROP;
+ }
+ return NF_ACCEPT;
+}
+
+static void __exit nf_nat_ftp_fini(void)
+{
+ rcu_assign_pointer(nf_nat_ftp_hook, NULL);
+ synchronize_rcu();
+}
+
+static int __init nf_nat_ftp_init(void)
+{
+ BUG_ON(rcu_dereference(nf_nat_ftp_hook));
+ rcu_assign_pointer(nf_nat_ftp_hook, nf_nat_ftp);
+ return 0;
+}
+
+/* Prior to 2.6.11, we had a ports param. No longer, but don't break users. */
+static int warn_set(const char *val, struct kernel_param *kp)
+{
+ printk(KERN_INFO KBUILD_MODNAME
+ ": kernel >= 2.6.10 only uses 'ports' for conntrack modules\n");
+ return 0;
+}
+module_param_call(ports, warn_set, NULL, NULL, 0);
+
+module_init(nf_nat_ftp_init);
+module_exit(nf_nat_ftp_fini);
diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c
index e299d65..92a9471 100644
--- a/net/netfilter/nf_conntrack_ftp.c
+++ b/net/netfilter/nf_conntrack_ftp.c
@@ -51,7 +51,7 @@ module_param(loose, bool, 0600);
unsigned int (*nf_nat_ftp_hook)(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
- enum ip_ct_ftp_type type,
+ enum nf_ct_ftp_type type,
unsigned int matchoff,
unsigned int matchlen,
struct nf_conntrack_expect *exp,
@@ -74,7 +74,7 @@ static struct ftp_search {
size_t plen;
char skip;
char term;
- enum ip_ct_ftp_type ftptype;
+ enum nf_ct_ftp_type ftptype;
int (*getnum)(const char *, size_t, struct nf_conntrack_man *, char);
} search[IP_CT_DIR_MAX][2] = {
[IP_CT_DIR_ORIGINAL] = {
@@ -83,7 +83,7 @@ static struct ftp_search {
.plen = sizeof("PORT") - 1,
.skip = ' ',
.term = '\r',
- .ftptype = IP_CT_FTP_PORT,
+ .ftptype = NF_CT_FTP_PORT,
.getnum = try_rfc959,
},
{
@@ -91,7 +91,7 @@ static struct ftp_search {
.plen = sizeof("EPRT") - 1,
.skip = ' ',
.term = '\r',
- .ftptype = IP_CT_FTP_EPRT,
+ .ftptype = NF_CT_FTP_EPRT,
.getnum = try_eprt,
},
},
@@ -101,7 +101,7 @@ static struct ftp_search {
.plen = sizeof("227 ") - 1,
.skip = '(',
.term = ')',
- .ftptype = IP_CT_FTP_PASV,
+ .ftptype = NF_CT_FTP_PASV,
.getnum = try_rfc959,
},
{
@@ -109,7 +109,7 @@ static struct ftp_search {
.plen = sizeof("229 ") - 1,
.skip = '(',
.term = ')',
- .ftptype = IP_CT_FTP_EPSV,
+ .ftptype = NF_CT_FTP_EPSV,
.getnum = try_epsv_response,
},
},
@@ -320,7 +320,7 @@ #endif
}
/* Look up to see if we're just after a \n. */
-static int find_nl_seq(u32 seq, const struct ip_ct_ftp_master *info, int dir)
+static int find_nl_seq(u32 seq, const struct nf_ct_ftp_master *info, int dir)
{
unsigned int i;
@@ -331,7 +331,7 @@ static int find_nl_seq(u32 seq, const st
}
/* We don't update if it's older than what we have. */
-static void update_nl_seq(u32 nl_seq, struct ip_ct_ftp_master *info, int dir,
+static void update_nl_seq(u32 nl_seq, struct nf_ct_ftp_master *info, int dir,
struct sk_buff *skb)
{
unsigned int i, oldest = NUM_SEQ_TO_REMEMBER;
@@ -367,7 +367,7 @@ static int help(struct sk_buff **pskb,
u32 seq;
int dir = CTINFO2DIR(ctinfo);
unsigned int matchlen, matchoff;
- struct ip_ct_ftp_master *ct_ftp_info = &nfct_help(ct)->help.ct_ftp_info;
+ struct nf_ct_ftp_master *ct_ftp_info = &nfct_help(ct)->help.ct_ftp_info;
struct nf_conntrack_expect *exp;
struct nf_conntrack_man cmd = {};
unsigned int i;
@@ -523,7 +523,7 @@ static int help(struct sk_buff **pskb,
/* Now, NAT might want to mangle the packet, and register the
* (possibly changed) expectation itself. */
nf_nat_ftp = rcu_dereference(nf_nat_ftp_hook);
- if (nf_nat_ftp)
+ if (nf_nat_ftp && ct->status & IPS_NAT_MASK)
ret = nf_nat_ftp(pskb, ctinfo, search[dir][i].ftptype,
matchoff, matchlen, exp, &seq);
else {
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 10/20]: nf_conntrack: add helper function for expectation initialization
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (8 preceding siblings ...)
2006-12-02 14:49 ` [NETFILTER 09/20]: nf_nat: add FTP NAT helper port Patrick McHardy
@ 2006-12-02 14:49 ` Patrick McHardy
2006-12-02 14:49 ` [NETFILTER 11/20]: nf_conntrack/nf_nat: add amanda helper port Patrick McHardy
` (10 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:49 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack: add helper function for expectation initialization
Expectation address masks need to be differently initialized depending
on the address family, create helper function to avoid cluttering up
the code too much.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit 3aaeacdbed7ac9ef0fbf569f45c8a9ee4323ab19
tree 3288e7f3bae1c703aac53b7a2063e9adb74745ff
parent c36fe54cbb2515da933901095b4df503d9943bfd
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:07 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:07 +0100
include/net/netfilter/nf_conntrack_expect.h | 4 ++
include/net/netfilter/nf_conntrack_tuple.h | 10 +---
net/netfilter/nf_conntrack_expect.c | 68 +++++++++++++++++++++++++++
3 files changed, 75 insertions(+), 7 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack_expect.h b/include/net/netfilter/nf_conntrack_expect.h
index b969c43..54a3d03 100644
--- a/include/net/netfilter/nf_conntrack_expect.h
+++ b/include/net/netfilter/nf_conntrack_expect.h
@@ -68,6 +68,10 @@ void nf_conntrack_unexpect_related(struc
/* Allocate space for an expectation: this is mandatory before calling
nf_conntrack_expect_related. You will have to call put afterwards. */
struct nf_conntrack_expect *nf_conntrack_expect_alloc(struct nf_conn *me);
+void nf_conntrack_expect_init(struct nf_conntrack_expect *, int,
+ union nf_conntrack_address *,
+ union nf_conntrack_address *,
+ u_int8_t, __be16 *, __be16 *);
void nf_conntrack_expect_put(struct nf_conntrack_expect *exp);
int nf_conntrack_expect_related(struct nf_conntrack_expect *expect);
diff --git a/include/net/netfilter/nf_conntrack_tuple.h b/include/net/netfilter/nf_conntrack_tuple.h
index be9dc9a..c96a9c5 100644
--- a/include/net/netfilter/nf_conntrack_tuple.h
+++ b/include/net/netfilter/nf_conntrack_tuple.h
@@ -24,7 +24,7 @@ #define NF_CT_TUPLE_L3SIZE 4
/* The l3 protocol-specific manipulable parts of the tuple: always in
network order! */
-union nf_conntrack_man_l3proto {
+union nf_conntrack_address {
u_int32_t all[NF_CT_TUPLE_L3SIZE];
__be32 ip;
__be32 ip6[4];
@@ -54,7 +54,7 @@ union nf_conntrack_man_proto
/* The manipulable part of the tuple. */
struct nf_conntrack_man
{
- union nf_conntrack_man_l3proto u3;
+ union nf_conntrack_address u3;
union nf_conntrack_man_proto u;
/* Layer 3 protocol */
u_int16_t l3num;
@@ -67,11 +67,7 @@ struct nf_conntrack_tuple
/* These are the parts of the tuple which are fixed. */
struct {
- union {
- u_int32_t all[NF_CT_TUPLE_L3SIZE];
- u_int32_t ip;
- u_int32_t ip6[4];
- } u3;
+ union nf_conntrack_address u3;
union {
/* Add other protocols here. */
u_int16_t all;
diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index aa5903e..68623ae 100644
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -196,6 +196,74 @@ struct nf_conntrack_expect *nf_conntrack
return new;
}
+void nf_conntrack_expect_init(struct nf_conntrack_expect *exp, int family,
+ union nf_conntrack_address *saddr,
+ union nf_conntrack_address *daddr,
+ u_int8_t proto, __be16 *src, __be16 *dst)
+{
+ int len;
+
+ if (family == AF_INET)
+ len = 4;
+ else
+ len = 16;
+
+ exp->flags = 0;
+ exp->expectfn = NULL;
+ exp->helper = NULL;
+ exp->tuple.src.l3num = family;
+ exp->tuple.dst.protonum = proto;
+ exp->mask.src.l3num = 0xFFFF;
+ exp->mask.dst.protonum = 0xFF;
+
+ if (saddr) {
+ memcpy(&exp->tuple.src.u3, saddr, len);
+ if (sizeof(exp->tuple.src.u3) > len)
+ /* address needs to be cleared for nf_ct_tuple_equal */
+ memset((void *)&exp->tuple.src.u3 + len, 0x00,
+ sizeof(exp->tuple.src.u3) - len);
+ memset(&exp->mask.src.u3, 0xFF, len);
+ if (sizeof(exp->mask.src.u3) > len)
+ memset((void *)&exp->mask.src.u3 + len, 0x00,
+ sizeof(exp->mask.src.u3) - len);
+ } else {
+ memset(&exp->tuple.src.u3, 0x00, sizeof(exp->tuple.src.u3));
+ memset(&exp->mask.src.u3, 0x00, sizeof(exp->mask.src.u3));
+ }
+
+ if (daddr) {
+ memcpy(&exp->tuple.dst.u3, daddr, len);
+ if (sizeof(exp->tuple.dst.u3) > len)
+ /* address needs to be cleared for nf_ct_tuple_equal */
+ memset((void *)&exp->tuple.dst.u3 + len, 0x00,
+ sizeof(exp->tuple.dst.u3) - len);
+ memset(&exp->mask.dst.u3, 0xFF, len);
+ if (sizeof(exp->mask.dst.u3) > len)
+ memset((void *)&exp->mask.dst.u3 + len, 0x00,
+ sizeof(exp->mask.dst.u3) - len);
+ } else {
+ memset(&exp->tuple.dst.u3, 0x00, sizeof(exp->tuple.dst.u3));
+ memset(&exp->mask.dst.u3, 0x00, sizeof(exp->mask.dst.u3));
+ }
+
+ if (src) {
+ exp->tuple.src.u.all = (__force u16)*src;
+ exp->mask.src.u.all = 0xFFFF;
+ } else {
+ exp->tuple.src.u.all = 0;
+ exp->mask.src.u.all = 0;
+ }
+
+ if (dst) {
+ exp->tuple.dst.u.all = (__force u16)*dst;
+ exp->mask.dst.u.all = 0xFFFF;
+ } else {
+ exp->tuple.dst.u.all = 0;
+ exp->mask.dst.u.all = 0;
+ }
+}
+EXPORT_SYMBOL_GPL(nf_conntrack_expect_init);
+
void nf_conntrack_expect_put(struct nf_conntrack_expect *exp)
{
if (atomic_dec_and_test(&exp->use))
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 11/20]: nf_conntrack/nf_nat: add amanda helper port
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (9 preceding siblings ...)
2006-12-02 14:49 ` [NETFILTER 10/20]: nf_conntrack: add helper function for expectation initialization Patrick McHardy
@ 2006-12-02 14:49 ` Patrick McHardy
2006-12-02 14:49 ` [NETFILTER 13/20]: nf_conntrack/nf_nat: add IRC " Patrick McHardy
` (9 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:49 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack/nf_nat: add amanda helper port
Add IPv4 and IPv6 capable nf_conntrack port of the Amanda conntrack/NAT helper.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit ff0a8e885f158f305e07bddc42071c531930db6f
tree 7cf2ed667a7f3fa43618b2062a9096716f0c4c2f
parent 3aaeacdbed7ac9ef0fbf569f45c8a9ee4323ab19
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:08 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:08 +0100
include/linux/netfilter/nf_conntrack_amanda.h | 10 +
net/ipv4/netfilter/Kconfig | 5 +
net/ipv4/netfilter/Makefile | 1
net/ipv4/netfilter/nf_nat_amanda.c | 78 ++++++++
net/netfilter/Kconfig | 15 ++
net/netfilter/Makefile | 1
net/netfilter/nf_conntrack_amanda.c | 237 +++++++++++++++++++++++++
7 files changed, 347 insertions(+), 0 deletions(-)
diff --git a/include/linux/netfilter/nf_conntrack_amanda.h b/include/linux/netfilter/nf_conntrack_amanda.h
new file mode 100644
index 0000000..26c2235
--- /dev/null
+++ b/include/linux/netfilter/nf_conntrack_amanda.h
@@ -0,0 +1,10 @@
+#ifndef _NF_CONNTRACK_AMANDA_H
+#define _NF_CONNTRACK_AMANDA_H
+/* AMANDA tracking. */
+
+extern unsigned int (*nf_nat_amanda_hook)(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ unsigned int matchoff,
+ unsigned int matchlen,
+ struct nf_conntrack_expect *exp);
+#endif /* _NF_CONNTRACK_AMANDA_H */
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 52f876d..6993ec5 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -512,6 +512,11 @@ config IP_NF_NAT_AMANDA
default IP_NF_NAT if IP_NF_AMANDA=y
default m if IP_NF_AMANDA=m
+config NF_NAT_AMANDA
+ tristate
+ depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
+ default NF_NAT && NF_CONNTRACK_AMANDA
+
config IP_NF_NAT_PPTP
tristate
depends on IP_NF_NAT!=n && IP_NF_PPTP!=n
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index c0c6194..8893249 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_IP_NF_NAT_IRC) += ip_nat_ir
obj-$(CONFIG_IP_NF_NAT_SIP) += ip_nat_sip.o
# NAT helpers (nf_conntrack)
+obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_amanda.o
obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
# generic IP tables
diff --git a/net/ipv4/netfilter/nf_nat_amanda.c b/net/ipv4/netfilter/nf_nat_amanda.c
new file mode 100644
index 0000000..0f17098
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_amanda.c
@@ -0,0 +1,78 @@
+/* Amanda extension for TCP NAT alteration.
+ * (C) 2002 by Brian J. Murrell <netfilter@interlinx.bc.ca>
+ * based on a copy of HW's ip_nat_irc.c as well as other modules
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/udp.h>
+
+#include <net/netfilter/nf_nat_helper.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <linux/netfilter/nf_conntrack_amanda.h>
+
+MODULE_AUTHOR("Brian J. Murrell <netfilter@interlinx.bc.ca>");
+MODULE_DESCRIPTION("Amanda NAT helper");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ip_nat_amanda");
+
+static unsigned int help(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ unsigned int matchoff,
+ unsigned int matchlen,
+ struct nf_conntrack_expect *exp)
+{
+ char buffer[sizeof("65535")];
+ u_int16_t port;
+ unsigned int ret;
+
+ /* Connection comes from client. */
+ exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
+ exp->dir = IP_CT_DIR_ORIGINAL;
+
+ /* When you see the packet, we need to NAT it the same as the
+ * this one (ie. same IP: it will be TCP and master is UDP). */
+ exp->expectfn = nf_nat_follow_master;
+
+ /* Try to get same port: if not, try to change it. */
+ for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
+ exp->tuple.dst.u.tcp.port = htons(port);
+ if (nf_conntrack_expect_related(exp) == 0)
+ break;
+ }
+
+ if (port == 0)
+ return NF_DROP;
+
+ sprintf(buffer, "%u", port);
+ ret = nf_nat_mangle_udp_packet(pskb, exp->master, ctinfo,
+ matchoff, matchlen,
+ buffer, strlen(buffer));
+ if (ret != NF_ACCEPT)
+ nf_conntrack_unexpect_related(exp);
+ return ret;
+}
+
+static void __exit nf_nat_amanda_fini(void)
+{
+ rcu_assign_pointer(nf_nat_amanda_hook, NULL);
+ synchronize_rcu();
+}
+
+static int __init nf_nat_amanda_init(void)
+{
+ BUG_ON(rcu_dereference(nf_nat_amanda_hook));
+ rcu_assign_pointer(nf_nat_amanda_hook, help);
+ return 0;
+}
+
+module_init(nf_nat_amanda_init);
+module_exit(nf_nat_amanda_fini);
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index efe56f7..f85fd43 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -131,6 +131,21 @@ config NF_CT_PROTO_SCTP
If you want to compile it as a module, say M here and read
Documentation/modules.txt. If unsure, say `N'.
+config NF_CONNTRACK_AMANDA
+ tristate "Amanda backup protocol support (EXPERIMENTAL)"
+ depends on EXPERIMENTAL && NF_CONNTRACK
+ select TEXTSEARCH
+ select TEXTSEARCH_KMP
+ help
+ If you are running the Amanda backup package <http://www.amanda.org/>
+ on this machine or machines that will be MASQUERADED through this
+ machine, then you may want to enable this feature. This allows the
+ connection tracking and natting code to allow the sub-channels that
+ Amanda requires for communication of the backup data, messages and
+ index.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config NF_CONNTRACK_FTP
tristate "FTP support on new connection tracking (EXPERIMENTAL)"
depends on EXPERIMENTAL && NF_CONNTRACK
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 7f0089c..a5ee938 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -20,6 +20,7 @@ # netlink interface for nf_conntrack
obj-$(CONFIG_NF_CT_NETLINK) += nf_conntrack_netlink.o
# connection tracking helpers
+obj-$(CONFIG_NF_CONNTRACK_AMANDA) += nf_conntrack_amanda.o
obj-$(CONFIG_NF_CONNTRACK_FTP) += nf_conntrack_ftp.o
# generic X tables
diff --git a/net/netfilter/nf_conntrack_amanda.c b/net/netfilter/nf_conntrack_amanda.c
new file mode 100644
index 0000000..5c495dc
--- /dev/null
+++ b/net/netfilter/nf_conntrack_amanda.c
@@ -0,0 +1,237 @@
+/* Amanda extension for IP connection tracking
+ *
+ * (C) 2002 by Brian J. Murrell <netfilter@interlinx.bc.ca>
+ * based on HW's ip_conntrack_irc.c as well as other modules
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/textsearch.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/udp.h>
+
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <linux/netfilter/nf_conntrack_amanda.h>
+
+static unsigned int master_timeout __read_mostly = 300;
+static char *ts_algo = "kmp";
+
+MODULE_AUTHOR("Brian J. Murrell <netfilter@interlinx.bc.ca>");
+MODULE_DESCRIPTION("Amanda connection tracking module");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ip_conntrack_amanda");
+
+module_param(master_timeout, uint, 0600);
+MODULE_PARM_DESC(master_timeout, "timeout for the master connection");
+module_param(ts_algo, charp, 0400);
+MODULE_PARM_DESC(ts_algo, "textsearch algorithm to use (default kmp)");
+
+unsigned int (*nf_nat_amanda_hook)(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ unsigned int matchoff,
+ unsigned int matchlen,
+ struct nf_conntrack_expect *exp)
+ __read_mostly;
+EXPORT_SYMBOL_GPL(nf_nat_amanda_hook);
+
+enum amanda_strings {
+ SEARCH_CONNECT,
+ SEARCH_NEWLINE,
+ SEARCH_DATA,
+ SEARCH_MESG,
+ SEARCH_INDEX,
+};
+
+static struct {
+ char *string;
+ size_t len;
+ struct ts_config *ts;
+} search[] __read_mostly = {
+ [SEARCH_CONNECT] = {
+ .string = "CONNECT ",
+ .len = 8,
+ },
+ [SEARCH_NEWLINE] = {
+ .string = "\n",
+ .len = 1,
+ },
+ [SEARCH_DATA] = {
+ .string = "DATA ",
+ .len = 5,
+ },
+ [SEARCH_MESG] = {
+ .string = "MESG ",
+ .len = 5,
+ },
+ [SEARCH_INDEX] = {
+ .string = "INDEX ",
+ .len = 6,
+ },
+};
+
+static int amanda_help(struct sk_buff **pskb,
+ unsigned int protoff,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ struct ts_state ts;
+ struct nf_conntrack_expect *exp;
+ struct nf_conntrack_tuple *tuple;
+ unsigned int dataoff, start, stop, off, i;
+ char pbuf[sizeof("65535")], *tmp;
+ u_int16_t len;
+ __be16 port;
+ int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
+ int ret = NF_ACCEPT;
+ typeof(nf_nat_amanda_hook) nf_nat_amanda;
+
+ /* Only look at packets from the Amanda server */
+ if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL)
+ return NF_ACCEPT;
+
+ /* increase the UDP timeout of the master connection as replies from
+ * Amanda clients to the server can be quite delayed */
+ nf_ct_refresh(ct, *pskb, master_timeout * HZ);
+
+ /* No data? */
+ dataoff = protoff + sizeof(struct udphdr);
+ if (dataoff >= (*pskb)->len) {
+ if (net_ratelimit())
+ printk("amanda_help: skblen = %u\n", (*pskb)->len);
+ return NF_ACCEPT;
+ }
+
+ memset(&ts, 0, sizeof(ts));
+ start = skb_find_text(*pskb, dataoff, (*pskb)->len,
+ search[SEARCH_CONNECT].ts, &ts);
+ if (start == UINT_MAX)
+ goto out;
+ start += dataoff + search[SEARCH_CONNECT].len;
+
+ memset(&ts, 0, sizeof(ts));
+ stop = skb_find_text(*pskb, start, (*pskb)->len,
+ search[SEARCH_NEWLINE].ts, &ts);
+ if (stop == UINT_MAX)
+ goto out;
+ stop += start;
+
+ for (i = SEARCH_DATA; i <= SEARCH_INDEX; i++) {
+ memset(&ts, 0, sizeof(ts));
+ off = skb_find_text(*pskb, start, stop, search[i].ts, &ts);
+ if (off == UINT_MAX)
+ continue;
+ off += start + search[i].len;
+
+ len = min_t(unsigned int, sizeof(pbuf) - 1, stop - off);
+ if (skb_copy_bits(*pskb, off, pbuf, len))
+ break;
+ pbuf[len] = '\0';
+
+ port = htons(simple_strtoul(pbuf, &tmp, 10));
+ len = tmp - pbuf;
+ if (port == 0 || len > 5)
+ break;
+
+ exp = nf_conntrack_expect_alloc(ct);
+ if (exp == NULL) {
+ ret = NF_DROP;
+ goto out;
+ }
+ tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+ nf_conntrack_expect_init(exp, family,
+ &tuple->src.u3, &tuple->dst.u3,
+ IPPROTO_TCP, NULL, &port);
+
+ nf_nat_amanda = rcu_dereference(nf_nat_amanda_hook);
+ if (nf_nat_amanda && ct->status & IPS_NAT_MASK)
+ ret = nf_nat_amanda(pskb, ctinfo, off - dataoff,
+ len, exp);
+ else if (nf_conntrack_expect_related(exp) != 0)
+ ret = NF_DROP;
+ nf_conntrack_expect_put(exp);
+ }
+
+out:
+ return ret;
+}
+
+static struct nf_conntrack_helper amanda_helper[2] __read_mostly = {
+ {
+ .name = "amanda",
+ .max_expected = 3,
+ .timeout = 180,
+ .me = THIS_MODULE,
+ .help = amanda_help,
+ .tuple.src.l3num = AF_INET,
+ .tuple.src.u.udp.port = __constant_htons(10080),
+ .tuple.dst.protonum = IPPROTO_UDP,
+ .mask.src.l3num = 0xFFFF,
+ .mask.src.u.udp.port = __constant_htons(0xFFFF),
+ .mask.dst.protonum = 0xFF,
+ },
+ {
+ .name = "amanda",
+ .max_expected = 3,
+ .timeout = 180,
+ .me = THIS_MODULE,
+ .help = amanda_help,
+ .tuple.src.l3num = AF_INET6,
+ .tuple.src.u.udp.port = __constant_htons(10080),
+ .tuple.dst.protonum = IPPROTO_UDP,
+ .mask.src.l3num = 0xFFFF,
+ .mask.src.u.udp.port = __constant_htons(0xFFFF),
+ .mask.dst.protonum = 0xFF,
+ },
+};
+
+static void __exit nf_conntrack_amanda_fini(void)
+{
+ int i;
+
+ nf_conntrack_helper_unregister(&amanda_helper[0]);
+ nf_conntrack_helper_unregister(&amanda_helper[1]);
+ for (i = 0; i < ARRAY_SIZE(search); i++)
+ textsearch_destroy(search[i].ts);
+}
+
+static int __init nf_conntrack_amanda_init(void)
+{
+ int ret, i;
+
+ ret = -ENOMEM;
+ for (i = 0; i < ARRAY_SIZE(search); i++) {
+ search[i].ts = textsearch_prepare(ts_algo, search[i].string,
+ search[i].len,
+ GFP_KERNEL, TS_AUTOLOAD);
+ if (search[i].ts == NULL)
+ goto err1;
+ }
+ ret = nf_conntrack_helper_register(&amanda_helper[0]);
+ if (ret < 0)
+ goto err1;
+ ret = nf_conntrack_helper_register(&amanda_helper[1]);
+ if (ret < 0)
+ goto err2;
+ return 0;
+
+err2:
+ nf_conntrack_helper_unregister(&amanda_helper[0]);
+err1:
+ for (; i >= 0; i--) {
+ if (search[i].ts)
+ textsearch_destroy(search[i].ts);
+ }
+ return ret;
+}
+
+module_init(nf_conntrack_amanda_init);
+module_exit(nf_conntrack_amanda_fini);
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 13/20]: nf_conntrack/nf_nat: add IRC helper port
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (10 preceding siblings ...)
2006-12-02 14:49 ` [NETFILTER 11/20]: nf_conntrack/nf_nat: add amanda helper port Patrick McHardy
@ 2006-12-02 14:49 ` Patrick McHardy
2006-12-02 14:50 ` [NETFILTER 14/20]: nf_conntrack: add NetBIOS name service " Patrick McHardy
` (8 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:49 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack/nf_nat: add IRC helper port
Add nf_conntrack port of the IRC conntrack/NAT helper. Since DCC doesn't
support IPv6 yet, the helper is still IPv4 only.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit 40f6096353cbb0a314c42355ad927c54a849d092
tree 38e7783febc87a8b53c27c09ebdb28c4d5001b0f
parent b8dfee1057b0a3515ec561fd928e49204bbc4c4a
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:14 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:14 +0100
include/linux/netfilter/nf_conntrack_irc.h | 15 +
net/ipv4/netfilter/Kconfig | 5
net/ipv4/netfilter/Makefile | 1
net/ipv4/netfilter/nf_nat_irc.c | 101 ++++++++++
net/netfilter/Kconfig | 15 +
net/netfilter/Makefile | 1
net/netfilter/nf_conntrack_irc.c | 281 ++++++++++++++++++++++++++++
7 files changed, 419 insertions(+), 0 deletions(-)
diff --git a/include/linux/netfilter/nf_conntrack_irc.h b/include/linux/netfilter/nf_conntrack_irc.h
new file mode 100644
index 0000000..2ab6b82
--- /dev/null
+++ b/include/linux/netfilter/nf_conntrack_irc.h
@@ -0,0 +1,15 @@
+#ifndef _NF_CONNTRACK_IRC_H
+#define _NF_CONNTRACK_IRC_H
+
+#ifdef __KERNEL__
+
+#define IRC_PORT 6667
+
+extern unsigned int (*nf_nat_irc_hook)(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ unsigned int matchoff,
+ unsigned int matchlen,
+ struct nf_conntrack_expect *exp);
+
+#endif /* __KERNEL__ */
+#endif /* _NF_CONNTRACK_IRC_H */
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index e14156d..4555f72 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -500,6 +500,11 @@ config IP_NF_NAT_IRC
default IP_NF_NAT if IP_NF_IRC=y
default m if IP_NF_IRC=m
+config NF_NAT_IRC
+ tristate
+ depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
+ default NF_NAT && NF_CONNTRACK_IRC
+
config IP_NF_NAT_TFTP
tristate
depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index bdaba47..56733c3 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -53,6 +53,7 @@ # NAT helpers (nf_conntrack)
obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_amanda.o
obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
+obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
# generic IP tables
obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
diff --git a/net/ipv4/netfilter/nf_nat_irc.c b/net/ipv4/netfilter/nf_nat_irc.c
new file mode 100644
index 0000000..9b8c0da
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_irc.c
@@ -0,0 +1,101 @@
+/* IRC extension for TCP NAT alteration.
+ *
+ * (C) 2000-2001 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2004 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
+ * based on a copy of RR's ip_nat_ftp.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/tcp.h>
+#include <linux/kernel.h>
+
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_helper.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <linux/netfilter/nf_conntrack_irc.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
+MODULE_DESCRIPTION("IRC (DCC) NAT helper");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ip_nat_irc");
+
+static unsigned int help(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ unsigned int matchoff,
+ unsigned int matchlen,
+ struct nf_conntrack_expect *exp)
+{
+ char buffer[sizeof("4294967296 65635")];
+ u_int32_t ip;
+ u_int16_t port;
+ unsigned int ret;
+
+ DEBUGP("IRC_NAT: info (seq %u + %u) in %u\n",
+ expect->seq, exp_irc_info->len, ntohl(tcph->seq));
+
+ /* Reply comes from server. */
+ exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
+ exp->dir = IP_CT_DIR_REPLY;
+ exp->expectfn = nf_nat_follow_master;
+
+ /* Try to get same port: if not, try to change it. */
+ for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
+ exp->tuple.dst.u.tcp.port = htons(port);
+ if (nf_conntrack_expect_related(exp) == 0)
+ break;
+ }
+
+ if (port == 0)
+ return NF_DROP;
+
+ ip = ntohl(exp->master->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip);
+ sprintf(buffer, "%u %u", ip, port);
+ DEBUGP("nf_nat_irc: inserting '%s' == %u.%u.%u.%u, port %u\n",
+ buffer, NIPQUAD(ip), port);
+
+ ret = nf_nat_mangle_tcp_packet(pskb, exp->master, ctinfo,
+ matchoff, matchlen, buffer,
+ strlen(buffer));
+ if (ret != NF_ACCEPT)
+ nf_conntrack_unexpect_related(exp);
+ return ret;
+}
+
+static void __exit nf_nat_irc_fini(void)
+{
+ rcu_assign_pointer(nf_nat_irc_hook, NULL);
+ synchronize_rcu();
+}
+
+static int __init nf_nat_irc_init(void)
+{
+ BUG_ON(rcu_dereference(nf_nat_irc_hook));
+ rcu_assign_pointer(nf_nat_irc_hook, help);
+ return 0;
+}
+
+/* Prior to 2.6.11, we had a ports param. No longer, but don't break users. */
+static int warn_set(const char *val, struct kernel_param *kp)
+{
+ printk(KERN_INFO KBUILD_MODNAME
+ ": kernel >= 2.6.10 only uses 'ports' for conntrack modules\n");
+ return 0;
+}
+module_param_call(ports, warn_set, NULL, NULL, 0);
+
+module_init(nf_nat_irc_init);
+module_exit(nf_nat_irc_fini);
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index d8f3451..bd50897 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -179,6 +179,21 @@ config NF_CONNTRACK_H323
To compile it as a module, choose M here. If unsure, say N.
+config NF_CONNTRACK_IRC
+ tristate "IRC protocol support (EXPERIMENTAL)"
+ depends on EXPERIMENTAL && NF_CONNTRACK
+ help
+ There is a commonly-used extension to IRC called
+ Direct Client-to-Client Protocol (DCC). This enables users to send
+ files to each other, and also chat to each other without the need
+ of a server. DCC Sending is used anywhere you send files over IRC,
+ and DCC Chat is most commonly used by Eggdrop bots. If you are
+ using NAT, this extension will enable you to send files and initiate
+ chats. Note that you do NOT need this extension to get files or
+ have others initiate chats, or everything else in IRC.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config NF_CT_NETLINK
tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 69b5545..343fd48 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -25,6 +25,7 @@ nf_conntrack_h323-objs := nf_conntrack_h
obj-$(CONFIG_NF_CONNTRACK_AMANDA) += nf_conntrack_amanda.o
obj-$(CONFIG_NF_CONNTRACK_FTP) += nf_conntrack_ftp.o
obj-$(CONFIG_NF_CONNTRACK_H323) += nf_conntrack_h323.o
+obj-$(CONFIG_NF_CONNTRACK_IRC) += nf_conntrack_irc.o
# generic X tables
obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
diff --git a/net/netfilter/nf_conntrack_irc.c b/net/netfilter/nf_conntrack_irc.c
new file mode 100644
index 0000000..ed01db6
--- /dev/null
+++ b/net/netfilter/nf_conntrack_irc.c
@@ -0,0 +1,281 @@
+/* IRC extension for IP connection tracking, Version 1.21
+ * (C) 2000-2002 by Harald Welte <laforge@gnumonks.org>
+ * based on RR's ip_conntrack_ftp.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/tcp.h>
+#include <linux/netfilter.h>
+
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <linux/netfilter/nf_conntrack_irc.h>
+
+#define MAX_PORTS 8
+static unsigned short ports[MAX_PORTS];
+static int ports_c;
+static unsigned int max_dcc_channels = 8;
+static unsigned int dcc_timeout __read_mostly = 300;
+/* This is slow, but it's simple. --RR */
+static char *irc_buffer;
+static DEFINE_SPINLOCK(irc_buffer_lock);
+
+unsigned int (*nf_nat_irc_hook)(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ unsigned int matchoff,
+ unsigned int matchlen,
+ struct nf_conntrack_expect *exp) __read_mostly;
+EXPORT_SYMBOL_GPL(nf_nat_irc_hook);
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("IRC (DCC) connection tracking helper");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ip_conntrack_irc");
+
+module_param_array(ports, ushort, &ports_c, 0400);
+MODULE_PARM_DESC(ports, "port numbers of IRC servers");
+module_param(max_dcc_channels, uint, 0400);
+MODULE_PARM_DESC(max_dcc_channels, "max number of expected DCC channels per "
+ "IRC session");
+module_param(dcc_timeout, uint, 0400);
+MODULE_PARM_DESC(dcc_timeout, "timeout on for unestablished DCC channels");
+
+static const char *dccprotos[] = {
+ "SEND ", "CHAT ", "MOVE ", "TSEND ", "SCHAT "
+};
+
+#define MINMATCHLEN 5
+
+#if 0
+#define DEBUGP(format, args...) printk(KERN_DEBUG "%s:%s:" format, \
+ __FILE__, __FUNCTION__ , ## args)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+/* tries to get the ip_addr and port out of a dcc command
+ * return value: -1 on failure, 0 on success
+ * data pointer to first byte of DCC command data
+ * data_end pointer to last byte of dcc command data
+ * ip returns parsed ip of dcc command
+ * port returns parsed port of dcc command
+ * ad_beg_p returns pointer to first byte of addr data
+ * ad_end_p returns pointer to last byte of addr data
+ */
+static int parse_dcc(char *data, char *data_end, u_int32_t *ip,
+ u_int16_t *port, char **ad_beg_p, char **ad_end_p)
+{
+ /* at least 12: "AAAAAAAA P\1\n" */
+ while (*data++ != ' ')
+ if (data > data_end - 12)
+ return -1;
+
+ *ad_beg_p = data;
+ *ip = simple_strtoul(data, &data, 10);
+
+ /* skip blanks between ip and port */
+ while (*data == ' ') {
+ if (data >= data_end)
+ return -1;
+ data++;
+ }
+
+ *port = simple_strtoul(data, &data, 10);
+ *ad_end_p = data;
+
+ return 0;
+}
+
+static int help(struct sk_buff **pskb, unsigned int protoff,
+ struct nf_conn *ct, enum ip_conntrack_info ctinfo)
+{
+ unsigned int dataoff;
+ struct tcphdr _tcph, *th;
+ char *data, *data_limit, *ib_ptr;
+ int dir = CTINFO2DIR(ctinfo);
+ struct nf_conntrack_expect *exp;
+ struct nf_conntrack_tuple *tuple;
+ u_int32_t dcc_ip;
+ u_int16_t dcc_port;
+ __be16 port;
+ int i, ret = NF_ACCEPT;
+ char *addr_beg_p, *addr_end_p;
+ typeof(nf_nat_irc_hook) nf_nat_irc;
+
+ /* If packet is coming from IRC server */
+ if (dir == IP_CT_DIR_REPLY)
+ return NF_ACCEPT;
+
+ /* Until there's been traffic both ways, don't look in packets. */
+ if (ctinfo != IP_CT_ESTABLISHED &&
+ ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY)
+ return NF_ACCEPT;
+
+ /* Not a full tcp header? */
+ th = skb_header_pointer(*pskb, protoff, sizeof(_tcph), &_tcph);
+ if (th == NULL)
+ return NF_ACCEPT;
+
+ /* No data? */
+ dataoff = protoff + th->doff*4;
+ if (dataoff >= (*pskb)->len)
+ return NF_ACCEPT;
+
+ spin_lock_bh(&irc_buffer_lock);
+ ib_ptr = skb_header_pointer(*pskb, dataoff, (*pskb)->len - dataoff,
+ irc_buffer);
+ BUG_ON(ib_ptr == NULL);
+
+ data = ib_ptr;
+ data_limit = ib_ptr + (*pskb)->len - dataoff;
+
+ /* strlen("\1DCC SENT t AAAAAAAA P\1\n")=24
+ * 5+MINMATCHLEN+strlen("t AAAAAAAA P\1\n")=14 */
+ while (data < data_limit - (19 + MINMATCHLEN)) {
+ if (memcmp(data, "\1DCC ", 5)) {
+ data++;
+ continue;
+ }
+ data += 5;
+ /* we have at least (19+MINMATCHLEN)-5 bytes valid data left */
+
+ DEBUGP("DCC found in master %u.%u.%u.%u:%u %u.%u.%u.%u:%u...\n",
+ NIPQUAD(iph->saddr), ntohs(th->source),
+ NIPQUAD(iph->daddr), ntohs(th->dest));
+
+ for (i = 0; i < ARRAY_SIZE(dccprotos); i++) {
+ if (memcmp(data, dccprotos[i], strlen(dccprotos[i]))) {
+ /* no match */
+ continue;
+ }
+ data += strlen(dccprotos[i]);
+ DEBUGP("DCC %s detected\n", dccprotos[i]);
+
+ /* we have at least
+ * (19+MINMATCHLEN)-5-dccprotos[i].matchlen bytes valid
+ * data left (== 14/13 bytes) */
+ if (parse_dcc((char *)data, data_limit, &dcc_ip,
+ &dcc_port, &addr_beg_p, &addr_end_p)) {
+ DEBUGP("unable to parse dcc command\n");
+ continue;
+ }
+ DEBUGP("DCC bound ip/port: %u.%u.%u.%u:%u\n",
+ HIPQUAD(dcc_ip), dcc_port);
+
+ /* dcc_ip can be the internal OR external (NAT'ed) IP */
+ tuple = &ct->tuplehash[dir].tuple;
+ if (tuple->src.u3.ip != htonl(dcc_ip) &&
+ tuple->dst.u3.ip != htonl(dcc_ip)) {
+ if (net_ratelimit())
+ printk(KERN_WARNING
+ "Forged DCC command from "
+ "%u.%u.%u.%u: %u.%u.%u.%u:%u\n",
+ NIPQUAD(tuple->src.u3.ip),
+ HIPQUAD(dcc_ip), dcc_port);
+ continue;
+ }
+
+ exp = nf_conntrack_expect_alloc(ct);
+ if (exp == NULL) {
+ ret = NF_DROP;
+ goto out;
+ }
+ tuple = &ct->tuplehash[!dir].tuple;
+ port = htons(dcc_port);
+ nf_conntrack_expect_init(exp, tuple->src.l3num,
+ NULL, &tuple->dst.u3,
+ IPPROTO_TCP, NULL, &port);
+
+ nf_nat_irc = rcu_dereference(nf_nat_irc_hook);
+ if (nf_nat_irc && ct->status & IPS_NAT_MASK)
+ ret = nf_nat_irc(pskb, ctinfo,
+ addr_beg_p - ib_ptr,
+ addr_end_p - addr_beg_p,
+ exp);
+ else if (nf_conntrack_expect_related(exp) != 0)
+ ret = NF_DROP;
+ nf_conntrack_expect_put(exp);
+ goto out;
+ }
+ }
+ out:
+ spin_unlock_bh(&irc_buffer_lock);
+ return ret;
+}
+
+static struct nf_conntrack_helper irc[MAX_PORTS] __read_mostly;
+static char irc_names[MAX_PORTS][sizeof("irc-65535")] __read_mostly;
+
+static void nf_conntrack_irc_fini(void);
+
+static int __init nf_conntrack_irc_init(void)
+{
+ int i, ret;
+ char *tmpname;
+
+ if (max_dcc_channels < 1) {
+ printk("nf_ct_irc: max_dcc_channels must not be zero\n");
+ return -EINVAL;
+ }
+
+ irc_buffer = kmalloc(65536, GFP_KERNEL);
+ if (!irc_buffer)
+ return -ENOMEM;
+
+ /* If no port given, default to standard irc port */
+ if (ports_c == 0)
+ ports[ports_c++] = IRC_PORT;
+
+ for (i = 0; i < ports_c; i++) {
+ irc[i].tuple.src.l3num = AF_INET;
+ irc[i].tuple.src.u.tcp.port = htons(ports[i]);
+ irc[i].tuple.dst.protonum = IPPROTO_TCP;
+ irc[i].mask.src.l3num = 0xFFFF;
+ irc[i].mask.src.u.tcp.port = htons(0xFFFF);
+ irc[i].mask.dst.protonum = 0xFF;
+ irc[i].max_expected = max_dcc_channels;
+ irc[i].timeout = dcc_timeout;
+ irc[i].me = THIS_MODULE;
+ irc[i].help = help;
+
+ tmpname = &irc_names[i][0];
+ if (ports[i] == IRC_PORT)
+ sprintf(tmpname, "irc");
+ else
+ sprintf(tmpname, "irc-%u", i);
+ irc[i].name = tmpname;
+
+ ret = nf_conntrack_helper_register(&irc[i]);
+ if (ret) {
+ printk("nf_ct_irc: failed to register helper "
+ "for pf: %u port: %u\n",
+ irc[i].tuple.src.l3num, ports[i]);
+ nf_conntrack_irc_fini();
+ return ret;
+ }
+ }
+ return 0;
+}
+
+/* This function is intentionally _NOT_ defined as __exit, because
+ * it is needed by the init function */
+static void nf_conntrack_irc_fini(void)
+{
+ int i;
+
+ for (i = 0; i < ports_c; i++)
+ nf_conntrack_helper_unregister(&irc[i]);
+ kfree(irc_buffer);
+}
+
+module_init(nf_conntrack_irc_init);
+module_exit(nf_conntrack_irc_fini);
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 14/20]: nf_conntrack: add NetBIOS name service helper port
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (11 preceding siblings ...)
2006-12-02 14:49 ` [NETFILTER 13/20]: nf_conntrack/nf_nat: add IRC " Patrick McHardy
@ 2006-12-02 14:50 ` Patrick McHardy
2006-12-02 14:50 ` [NETFILTER 15/20]: nf_conntrack/nf_nat: add PPTP " Patrick McHardy
` (7 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:50 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack: add NetBIOS name service helper port
Add nf_conntrack port of the NetBIOS name service conntrack helper.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit ce27c390f71686cd741496297293a29a494df3d7
tree a54cffd39866457922150a4c9b9ac49eda693229
parent 40f6096353cbb0a314c42355ad927c54a849d092
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:16 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:16 +0100
net/netfilter/Kconfig | 19 +++++
net/netfilter/Makefile | 1
net/netfilter/nf_conntrack_netbios_ns.c | 125 +++++++++++++++++++++++++++++++
3 files changed, 145 insertions(+), 0 deletions(-)
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index bd50897..d1a365d 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -194,6 +194,25 @@ config NF_CONNTRACK_IRC
To compile it as a module, choose M here. If unsure, say N.
+config NF_CONNTRACK_NETBIOS_NS
+ tristate "NetBIOS name service protocol support (EXPERIMENTAL)"
+ depends on EXPERIMENTAL && NF_CONNTRACK
+ help
+ NetBIOS name service requests are sent as broadcast messages from an
+ unprivileged port and responded to with unicast messages to the
+ same port. This make them hard to firewall properly because connection
+ tracking doesn't deal with broadcasts. This helper tracks locally
+ originating NetBIOS name service requests and the corresponding
+ responses. It relies on correct IP address configuration, specifically
+ netmask and broadcast address. When properly configured, the output
+ of "ip address show" should look similar to this:
+
+ $ ip -4 address show eth0
+ 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
+ inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config NF_CT_NETLINK
tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 343fd48..67144b2 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_NF_CONNTRACK_AMANDA) += nf_
obj-$(CONFIG_NF_CONNTRACK_FTP) += nf_conntrack_ftp.o
obj-$(CONFIG_NF_CONNTRACK_H323) += nf_conntrack_h323.o
obj-$(CONFIG_NF_CONNTRACK_IRC) += nf_conntrack_irc.o
+obj-$(CONFIG_NF_CONNTRACK_NETBIOS_NS) += nf_conntrack_netbios_ns.o
# generic X tables
obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
diff --git a/net/netfilter/nf_conntrack_netbios_ns.c b/net/netfilter/nf_conntrack_netbios_ns.c
new file mode 100644
index 0000000..4fad3ad
--- /dev/null
+++ b/net/netfilter/nf_conntrack_netbios_ns.c
@@ -0,0 +1,125 @@
+/*
+ * NetBIOS name service broadcast connection tracking helper
+ *
+ * (c) 2005 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+/*
+ * This helper tracks locally originating NetBIOS name service
+ * requests by issuing permanent expectations (valid until
+ * timing out) matching all reply connections from the
+ * destination network. The only NetBIOS specific thing is
+ * actually the port number.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/if_addr.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <net/route.h>
+
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+
+#define NMBD_PORT 137
+
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_DESCRIPTION("NetBIOS name service broadcast connection tracking helper");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ip_conntrack_netbios_ns");
+
+static unsigned int timeout __read_mostly = 3;
+module_param(timeout, uint, 0400);
+MODULE_PARM_DESC(timeout, "timeout for master connection/replies in seconds");
+
+static int help(struct sk_buff **pskb, unsigned int protoff,
+ struct nf_conn *ct, enum ip_conntrack_info ctinfo)
+{
+ struct nf_conntrack_expect *exp;
+ struct iphdr *iph = (*pskb)->nh.iph;
+ struct rtable *rt = (struct rtable *)(*pskb)->dst;
+ struct in_device *in_dev;
+ __be32 mask = 0;
+
+ /* we're only interested in locally generated packets */
+ if ((*pskb)->sk == NULL)
+ goto out;
+ if (rt == NULL || !(rt->rt_flags & RTCF_BROADCAST))
+ goto out;
+ if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
+ goto out;
+
+ rcu_read_lock();
+ in_dev = __in_dev_get_rcu(rt->u.dst.dev);
+ if (in_dev != NULL) {
+ for_primary_ifa(in_dev) {
+ if (ifa->ifa_broadcast == iph->daddr) {
+ mask = ifa->ifa_mask;
+ break;
+ }
+ } endfor_ifa(in_dev);
+ }
+ rcu_read_unlock();
+
+ if (mask == 0)
+ goto out;
+
+ exp = nf_conntrack_expect_alloc(ct);
+ if (exp == NULL)
+ goto out;
+
+ exp->tuple = ct->tuplehash[IP_CT_DIR_REPLY].tuple;
+ exp->tuple.src.u.udp.port = htons(NMBD_PORT);
+
+ exp->mask.src.u3.ip = mask;
+ exp->mask.src.u.udp.port = htons(0xFFFF);
+ exp->mask.dst.u3.ip = htonl(0xFFFFFFFF);
+ exp->mask.dst.u.udp.port = htons(0xFFFF);
+ exp->mask.dst.protonum = 0xFF;
+
+ exp->expectfn = NULL;
+ exp->flags = NF_CT_EXPECT_PERMANENT;
+
+ nf_conntrack_expect_related(exp);
+ nf_conntrack_expect_put(exp);
+
+ nf_ct_refresh(ct, *pskb, timeout * HZ);
+out:
+ return NF_ACCEPT;
+}
+
+static struct nf_conntrack_helper helper __read_mostly = {
+ .name = "netbios-ns",
+ .tuple.src.l3num = AF_INET,
+ .tuple.src.u.udp.port = __constant_htons(NMBD_PORT),
+ .tuple.dst.protonum = IPPROTO_UDP,
+ .mask.src.l3num = 0xFFFF,
+ .mask.src.u.udp.port = __constant_htons(0xFFFF),
+ .mask.dst.protonum = 0xFF,
+ .max_expected = 1,
+ .me = THIS_MODULE,
+ .help = help,
+};
+
+static int __init nf_conntrack_netbios_ns_init(void)
+{
+ helper.timeout = timeout;
+ return nf_conntrack_helper_register(&helper);
+}
+
+static void __exit nf_conntrack_netbios_ns_fini(void)
+{
+ nf_conntrack_helper_unregister(&helper);
+}
+
+module_init(nf_conntrack_netbios_ns_init);
+module_exit(nf_conntrack_netbios_ns_fini);
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 15/20]: nf_conntrack/nf_nat: add PPTP helper port
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (12 preceding siblings ...)
2006-12-02 14:50 ` [NETFILTER 14/20]: nf_conntrack: add NetBIOS name service " Patrick McHardy
@ 2006-12-02 14:50 ` Patrick McHardy
2006-12-02 14:50 ` [NETFILTER 16/20]: nf_conntrack/nf_nat: add SIP " Patrick McHardy
` (6 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:50 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack/nf_nat: add PPTP helper port
Add nf_conntrack port of the PPtP conntrack/NAT helper. Since there seems
to be no IPv6-capable PPtP implementation the helper only support IPv4.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit d076bee62093db6576c9c2950be703fc1b74be64
tree d634792f8f1761c94243ff68071afc1770759c10
parent ce27c390f71686cd741496297293a29a494df3d7
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:19 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:19 +0100
include/linux/netfilter/nf_conntrack_pptp.h | 321 ++++++++++++
include/linux/netfilter/nf_conntrack_proto_gre.h | 112 ++++
include/net/netfilter/ipv4/nf_conntrack_ipv4.h | 2
include/net/netfilter/nf_conntrack.h | 4
include/net/netfilter/nf_conntrack_helper.h | 2
include/net/netfilter/nf_conntrack_tuple.h | 6
net/ipv4/netfilter/Kconfig | 10
net/ipv4/netfilter/Makefile | 4
net/ipv4/netfilter/nf_nat_pptp.c | 315 +++++++++++
net/ipv4/netfilter/nf_nat_proto_gre.c | 179 ++++++
net/netfilter/Kconfig | 23 +
net/netfilter/Makefile | 2
net/netfilter/nf_conntrack_core.c | 4
net/netfilter/nf_conntrack_pptp.c | 607 ++++++++++++++++++++++
net/netfilter/nf_conntrack_proto_gre.c | 305 +++++++++++
15 files changed, 1896 insertions(+), 0 deletions(-)
diff --git a/include/linux/netfilter/nf_conntrack_pptp.h b/include/linux/netfilter/nf_conntrack_pptp.h
new file mode 100644
index 0000000..fb049ec
--- /dev/null
+++ b/include/linux/netfilter/nf_conntrack_pptp.h
@@ -0,0 +1,321 @@
+/* PPTP constants and structs */
+#ifndef _NF_CONNTRACK_PPTP_H
+#define _NF_CONNTRACK_PPTP_H
+
+/* state of the control session */
+enum pptp_ctrlsess_state {
+ PPTP_SESSION_NONE, /* no session present */
+ PPTP_SESSION_ERROR, /* some session error */
+ PPTP_SESSION_STOPREQ, /* stop_sess request seen */
+ PPTP_SESSION_REQUESTED, /* start_sess request seen */
+ PPTP_SESSION_CONFIRMED, /* session established */
+};
+
+/* state of the call inside the control session */
+enum pptp_ctrlcall_state {
+ PPTP_CALL_NONE,
+ PPTP_CALL_ERROR,
+ PPTP_CALL_OUT_REQ,
+ PPTP_CALL_OUT_CONF,
+ PPTP_CALL_IN_REQ,
+ PPTP_CALL_IN_REP,
+ PPTP_CALL_IN_CONF,
+ PPTP_CALL_CLEAR_REQ,
+};
+
+/* conntrack private data */
+struct nf_ct_pptp_master {
+ enum pptp_ctrlsess_state sstate; /* session state */
+ enum pptp_ctrlcall_state cstate; /* call state */
+ __be16 pac_call_id; /* call id of PAC */
+ __be16 pns_call_id; /* call id of PNS */
+
+ /* in pre-2.6.11 this used to be per-expect. Now it is per-conntrack
+ * and therefore imposes a fixed limit on the number of maps */
+ struct nf_ct_gre_keymap *keymap[IP_CT_DIR_MAX];
+};
+
+struct nf_nat_pptp {
+ __be16 pns_call_id; /* NAT'ed PNS call id */
+ __be16 pac_call_id; /* NAT'ed PAC call id */
+};
+
+#ifdef __KERNEL__
+
+#define PPTP_CONTROL_PORT 1723
+
+#define PPTP_PACKET_CONTROL 1
+#define PPTP_PACKET_MGMT 2
+
+#define PPTP_MAGIC_COOKIE 0x1a2b3c4d
+
+struct pptp_pkt_hdr {
+ __u16 packetLength;
+ __be16 packetType;
+ __be32 magicCookie;
+};
+
+/* PptpControlMessageType values */
+#define PPTP_START_SESSION_REQUEST 1
+#define PPTP_START_SESSION_REPLY 2
+#define PPTP_STOP_SESSION_REQUEST 3
+#define PPTP_STOP_SESSION_REPLY 4
+#define PPTP_ECHO_REQUEST 5
+#define PPTP_ECHO_REPLY 6
+#define PPTP_OUT_CALL_REQUEST 7
+#define PPTP_OUT_CALL_REPLY 8
+#define PPTP_IN_CALL_REQUEST 9
+#define PPTP_IN_CALL_REPLY 10
+#define PPTP_IN_CALL_CONNECT 11
+#define PPTP_CALL_CLEAR_REQUEST 12
+#define PPTP_CALL_DISCONNECT_NOTIFY 13
+#define PPTP_WAN_ERROR_NOTIFY 14
+#define PPTP_SET_LINK_INFO 15
+
+#define PPTP_MSG_MAX 15
+
+/* PptpGeneralError values */
+#define PPTP_ERROR_CODE_NONE 0
+#define PPTP_NOT_CONNECTED 1
+#define PPTP_BAD_FORMAT 2
+#define PPTP_BAD_VALUE 3
+#define PPTP_NO_RESOURCE 4
+#define PPTP_BAD_CALLID 5
+#define PPTP_REMOVE_DEVICE_ERROR 6
+
+struct PptpControlHeader {
+ __be16 messageType;
+ __u16 reserved;
+};
+
+/* FramingCapability Bitmap Values */
+#define PPTP_FRAME_CAP_ASYNC 0x1
+#define PPTP_FRAME_CAP_SYNC 0x2
+
+/* BearerCapability Bitmap Values */
+#define PPTP_BEARER_CAP_ANALOG 0x1
+#define PPTP_BEARER_CAP_DIGITAL 0x2
+
+struct PptpStartSessionRequest {
+ __be16 protocolVersion;
+ __u16 reserved1;
+ __be32 framingCapability;
+ __be32 bearerCapability;
+ __be16 maxChannels;
+ __be16 firmwareRevision;
+ __u8 hostName[64];
+ __u8 vendorString[64];
+};
+
+/* PptpStartSessionResultCode Values */
+#define PPTP_START_OK 1
+#define PPTP_START_GENERAL_ERROR 2
+#define PPTP_START_ALREADY_CONNECTED 3
+#define PPTP_START_NOT_AUTHORIZED 4
+#define PPTP_START_UNKNOWN_PROTOCOL 5
+
+struct PptpStartSessionReply {
+ __be16 protocolVersion;
+ __u8 resultCode;
+ __u8 generalErrorCode;
+ __be32 framingCapability;
+ __be32 bearerCapability;
+ __be16 maxChannels;
+ __be16 firmwareRevision;
+ __u8 hostName[64];
+ __u8 vendorString[64];
+};
+
+/* PptpStopReasons */
+#define PPTP_STOP_NONE 1
+#define PPTP_STOP_PROTOCOL 2
+#define PPTP_STOP_LOCAL_SHUTDOWN 3
+
+struct PptpStopSessionRequest {
+ __u8 reason;
+ __u8 reserved1;
+ __u16 reserved2;
+};
+
+/* PptpStopSessionResultCode */
+#define PPTP_STOP_OK 1
+#define PPTP_STOP_GENERAL_ERROR 2
+
+struct PptpStopSessionReply {
+ __u8 resultCode;
+ __u8 generalErrorCode;
+ __u16 reserved1;
+};
+
+struct PptpEchoRequest {
+ __be32 identNumber;
+};
+
+/* PptpEchoReplyResultCode */
+#define PPTP_ECHO_OK 1
+#define PPTP_ECHO_GENERAL_ERROR 2
+
+struct PptpEchoReply {
+ __be32 identNumber;
+ __u8 resultCode;
+ __u8 generalErrorCode;
+ __u16 reserved;
+};
+
+/* PptpFramingType */
+#define PPTP_ASYNC_FRAMING 1
+#define PPTP_SYNC_FRAMING 2
+#define PPTP_DONT_CARE_FRAMING 3
+
+/* PptpCallBearerType */
+#define PPTP_ANALOG_TYPE 1
+#define PPTP_DIGITAL_TYPE 2
+#define PPTP_DONT_CARE_BEARER_TYPE 3
+
+struct PptpOutCallRequest {
+ __be16 callID;
+ __be16 callSerialNumber;
+ __be32 minBPS;
+ __be32 maxBPS;
+ __be32 bearerType;
+ __be32 framingType;
+ __be16 packetWindow;
+ __be16 packetProcDelay;
+ __be16 phoneNumberLength;
+ __u16 reserved1;
+ __u8 phoneNumber[64];
+ __u8 subAddress[64];
+};
+
+/* PptpCallResultCode */
+#define PPTP_OUTCALL_CONNECT 1
+#define PPTP_OUTCALL_GENERAL_ERROR 2
+#define PPTP_OUTCALL_NO_CARRIER 3
+#define PPTP_OUTCALL_BUSY 4
+#define PPTP_OUTCALL_NO_DIAL_TONE 5
+#define PPTP_OUTCALL_TIMEOUT 6
+#define PPTP_OUTCALL_DONT_ACCEPT 7
+
+struct PptpOutCallReply {
+ __be16 callID;
+ __be16 peersCallID;
+ __u8 resultCode;
+ __u8 generalErrorCode;
+ __be16 causeCode;
+ __be32 connectSpeed;
+ __be16 packetWindow;
+ __be16 packetProcDelay;
+ __be32 physChannelID;
+};
+
+struct PptpInCallRequest {
+ __be16 callID;
+ __be16 callSerialNumber;
+ __be32 callBearerType;
+ __be32 physChannelID;
+ __be16 dialedNumberLength;
+ __be16 dialingNumberLength;
+ __u8 dialedNumber[64];
+ __u8 dialingNumber[64];
+ __u8 subAddress[64];
+};
+
+/* PptpInCallResultCode */
+#define PPTP_INCALL_ACCEPT 1
+#define PPTP_INCALL_GENERAL_ERROR 2
+#define PPTP_INCALL_DONT_ACCEPT 3
+
+struct PptpInCallReply {
+ __be16 callID;
+ __be16 peersCallID;
+ __u8 resultCode;
+ __u8 generalErrorCode;
+ __be16 packetWindow;
+ __be16 packetProcDelay;
+ __u16 reserved;
+};
+
+struct PptpInCallConnected {
+ __be16 peersCallID;
+ __u16 reserved;
+ __be32 connectSpeed;
+ __be16 packetWindow;
+ __be16 packetProcDelay;
+ __be32 callFramingType;
+};
+
+struct PptpClearCallRequest {
+ __be16 callID;
+ __u16 reserved;
+};
+
+struct PptpCallDisconnectNotify {
+ __be16 callID;
+ __u8 resultCode;
+ __u8 generalErrorCode;
+ __be16 causeCode;
+ __u16 reserved;
+ __u8 callStatistics[128];
+};
+
+struct PptpWanErrorNotify {
+ __be16 peersCallID;
+ __u16 reserved;
+ __be32 crcErrors;
+ __be32 framingErrors;
+ __be32 hardwareOverRuns;
+ __be32 bufferOverRuns;
+ __be32 timeoutErrors;
+ __be32 alignmentErrors;
+};
+
+struct PptpSetLinkInfo {
+ __be16 peersCallID;
+ __u16 reserved;
+ __be32 sendAccm;
+ __be32 recvAccm;
+};
+
+union pptp_ctrl_union {
+ struct PptpStartSessionRequest sreq;
+ struct PptpStartSessionReply srep;
+ struct PptpStopSessionRequest streq;
+ struct PptpStopSessionReply strep;
+ struct PptpOutCallRequest ocreq;
+ struct PptpOutCallReply ocack;
+ struct PptpInCallRequest icreq;
+ struct PptpInCallReply icack;
+ struct PptpInCallConnected iccon;
+ struct PptpClearCallRequest clrreq;
+ struct PptpCallDisconnectNotify disc;
+ struct PptpWanErrorNotify wanerr;
+ struct PptpSetLinkInfo setlink;
+};
+
+/* crap needed for nf_conntrack_compat.h */
+struct nf_conn;
+struct nf_conntrack_expect;
+enum ip_conntrack_info;
+
+extern int
+(*nf_nat_pptp_hook_outbound)(struct sk_buff **pskb,
+ struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+ struct PptpControlHeader *ctlh,
+ union pptp_ctrl_union *pptpReq);
+
+extern int
+(*nf_nat_pptp_hook_inbound)(struct sk_buff **pskb,
+ struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+ struct PptpControlHeader *ctlh,
+ union pptp_ctrl_union *pptpReq);
+
+extern void
+(*nf_nat_pptp_hook_exp_gre)(struct nf_conntrack_expect *exp_orig,
+ struct nf_conntrack_expect *exp_reply);
+
+extern void
+(*nf_nat_pptp_hook_expectfn)(struct nf_conn *ct,
+ struct nf_conntrack_expect *exp);
+
+#endif /* __KERNEL__ */
+#endif /* _NF_CONNTRACK_PPTP_H */
diff --git a/include/linux/netfilter/nf_conntrack_proto_gre.h b/include/linux/netfilter/nf_conntrack_proto_gre.h
new file mode 100644
index 0000000..4e6bbce
--- /dev/null
+++ b/include/linux/netfilter/nf_conntrack_proto_gre.h
@@ -0,0 +1,112 @@
+#ifndef _CONNTRACK_PROTO_GRE_H
+#define _CONNTRACK_PROTO_GRE_H
+#include <asm/byteorder.h>
+
+/* GRE PROTOCOL HEADER */
+
+/* GRE Version field */
+#define GRE_VERSION_1701 0x0
+#define GRE_VERSION_PPTP 0x1
+
+/* GRE Protocol field */
+#define GRE_PROTOCOL_PPTP 0x880B
+
+/* GRE Flags */
+#define GRE_FLAG_C 0x80
+#define GRE_FLAG_R 0x40
+#define GRE_FLAG_K 0x20
+#define GRE_FLAG_S 0x10
+#define GRE_FLAG_A 0x80
+
+#define GRE_IS_C(f) ((f)&GRE_FLAG_C)
+#define GRE_IS_R(f) ((f)&GRE_FLAG_R)
+#define GRE_IS_K(f) ((f)&GRE_FLAG_K)
+#define GRE_IS_S(f) ((f)&GRE_FLAG_S)
+#define GRE_IS_A(f) ((f)&GRE_FLAG_A)
+
+/* GRE is a mess: Four different standards */
+struct gre_hdr {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ __u16 rec:3,
+ srr:1,
+ seq:1,
+ key:1,
+ routing:1,
+ csum:1,
+ version:3,
+ reserved:4,
+ ack:1;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ __u16 csum:1,
+ routing:1,
+ key:1,
+ seq:1,
+ srr:1,
+ rec:3,
+ ack:1,
+ reserved:4,
+ version:3;
+#else
+#error "Adjust your <asm/byteorder.h> defines"
+#endif
+ __be16 protocol;
+};
+
+/* modified GRE header for PPTP */
+struct gre_hdr_pptp {
+ __u8 flags; /* bitfield */
+ __u8 version; /* should be GRE_VERSION_PPTP */
+ __be16 protocol; /* should be GRE_PROTOCOL_PPTP */
+ __be16 payload_len; /* size of ppp payload, not inc. gre header */
+ __be16 call_id; /* peer's call_id for this session */
+ __be32 seq; /* sequence number. Present if S==1 */
+ __be32 ack; /* seq number of highest packet recieved by */
+ /* sender in this session */
+};
+
+struct nf_ct_gre {
+ unsigned int stream_timeout;
+ unsigned int timeout;
+};
+
+#ifdef __KERNEL__
+#include <net/netfilter/nf_conntrack_tuple.h>
+
+struct nf_conn;
+
+/* structure for original <-> reply keymap */
+struct nf_ct_gre_keymap {
+ struct list_head list;
+ struct nf_conntrack_tuple tuple;
+};
+
+/* add new tuple->key_reply pair to keymap */
+int nf_ct_gre_keymap_add(struct nf_conn *ct, enum ip_conntrack_dir dir,
+ struct nf_conntrack_tuple *t);
+
+/* delete keymap entries */
+void nf_ct_gre_keymap_destroy(struct nf_conn *ct);
+
+/* get pointer to gre key, if present */
+static inline __be32 *gre_key(struct gre_hdr *greh)
+{
+ if (!greh->key)
+ return NULL;
+ if (greh->csum || greh->routing)
+ return (__be32 *)(greh+sizeof(*greh)+4);
+ return (__be32 *)(greh+sizeof(*greh));
+}
+
+/* get pointer ot gre csum, if present */
+static inline __sum16 *gre_csum(struct gre_hdr *greh)
+{
+ if (!greh->csum)
+ return NULL;
+ return (__sum16 *)(greh+sizeof(*greh));
+}
+
+extern void nf_ct_gre_keymap_flush(void);
+extern void nf_nat_need_gre(void);
+
+#endif /* __KERNEL__ */
+#endif /* _CONNTRACK_PROTO_GRE_H */
diff --git a/include/net/netfilter/ipv4/nf_conntrack_ipv4.h b/include/net/netfilter/ipv4/nf_conntrack_ipv4.h
index a1c57ee..1401ccc 100644
--- a/include/net/netfilter/ipv4/nf_conntrack_ipv4.h
+++ b/include/net/netfilter/ipv4/nf_conntrack_ipv4.h
@@ -11,10 +11,12 @@ #define _NF_CONNTRACK_IPV4_H
#ifdef CONFIG_NF_NAT_NEEDED
#include <net/netfilter/nf_nat.h>
+#include <linux/netfilter/nf_conntrack_pptp.h>
/* per conntrack: nat application helper private data */
union nf_conntrack_nat_help {
/* insert nat helper private data here */
+ struct nf_nat_pptp nat_pptp_info;
};
struct nf_conn_nat {
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 1646076..032b36a 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -21,6 +21,7 @@ #include <asm/atomic.h>
#include <linux/netfilter/nf_conntrack_tcp.h>
#include <linux/netfilter/nf_conntrack_sctp.h>
+#include <linux/netfilter/nf_conntrack_proto_gre.h>
#include <net/netfilter/ipv4/nf_conntrack_icmp.h>
#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
@@ -33,6 +34,7 @@ union nf_conntrack_proto {
struct ip_ct_tcp tcp;
struct ip_ct_icmp icmp;
struct nf_ct_icmpv6 icmpv6;
+ struct nf_ct_gre gre;
};
union nf_conntrack_expect_proto {
@@ -41,12 +43,14 @@ union nf_conntrack_expect_proto {
/* Add protocol helper include file here */
#include <linux/netfilter/nf_conntrack_ftp.h>
+#include <linux/netfilter/nf_conntrack_pptp.h>
#include <linux/netfilter/nf_conntrack_h323.h>
/* per conntrack: application helper private data */
union nf_conntrack_help {
/* insert conntrack helper private data (master) here */
struct nf_ct_ftp_master ct_ftp_info;
+ struct nf_ct_pptp_master ct_pptp_info;
struct nf_ct_h323_master ct_h323_info;
};
diff --git a/include/net/netfilter/nf_conntrack_helper.h b/include/net/netfilter/nf_conntrack_helper.h
index fbba9e8..8c72ac9 100644
--- a/include/net/netfilter/nf_conntrack_helper.h
+++ b/include/net/netfilter/nf_conntrack_helper.h
@@ -34,6 +34,8 @@ struct nf_conntrack_helper
struct nf_conn *ct,
enum ip_conntrack_info conntrackinfo);
+ void (*destroy)(struct nf_conn *ct);
+
int (*to_nfattr)(struct sk_buff *skb, const struct nf_conn *ct);
};
diff --git a/include/net/netfilter/nf_conntrack_tuple.h b/include/net/netfilter/nf_conntrack_tuple.h
index c96a9c5..5d72b16 100644
--- a/include/net/netfilter/nf_conntrack_tuple.h
+++ b/include/net/netfilter/nf_conntrack_tuple.h
@@ -49,6 +49,9 @@ union nf_conntrack_man_proto
struct {
__be16 port;
} sctp;
+ struct {
+ __be16 key; /* GRE key is 32bit, PPtP only uses 16bit */
+ } gre;
};
/* The manipulable part of the tuple. */
@@ -84,6 +87,9 @@ struct nf_conntrack_tuple
struct {
__be16 port;
} sctp;
+ struct {
+ __be16 key;
+ } gre;
} u;
/* The protocol. */
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 4555f72..c3327ac 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -484,6 +484,10 @@ #
# <expr> '&&' <expr> (6)
#
# (6) Returns the result of min(/expr/, /expr/).
+config NF_NAT_PROTO_GRE
+ tristate
+ depends on NF_NAT && NF_CT_PROTO_GRE
+
config IP_NF_NAT_FTP
tristate
depends on IP_NF_IPTABLES && IP_NF_CONNTRACK && IP_NF_NAT
@@ -528,6 +532,12 @@ config IP_NF_NAT_PPTP
default IP_NF_NAT if IP_NF_PPTP=y
default m if IP_NF_PPTP=m
+config NF_NAT_PPTP
+ tristate
+ depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
+ default NF_NAT && NF_CONNTRACK_PPTP
+ select NF_NAT_PROTO_GRE
+
config IP_NF_NAT_H323
tristate
depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 56733c3..ef33ff2 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -54,6 +54,10 @@ obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_am
obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
+obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o
+
+# NAT protocols (nf_nat)
+obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o
# generic IP tables
obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
diff --git a/net/ipv4/netfilter/nf_nat_pptp.c b/net/ipv4/netfilter/nf_nat_pptp.c
new file mode 100644
index 0000000..0ae45b7
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_pptp.c
@@ -0,0 +1,315 @@
+/*
+ * nf_nat_pptp.c
+ *
+ * NAT support for PPTP (Point to Point Tunneling Protocol).
+ * PPTP is a a protocol for creating virtual private networks.
+ * It is a specification defined by Microsoft and some vendors
+ * working with Microsoft. PPTP is built on top of a modified
+ * version of the Internet Generic Routing Encapsulation Protocol.
+ * GRE is defined in RFC 1701 and RFC 1702. Documentation of
+ * PPTP can be found in RFC 2637
+ *
+ * (C) 2000-2005 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ *
+ * TODO: - NAT to a unique tuple, not to TCP source port
+ * (needs netfilter tuple reservation)
+ */
+
+#include <linux/module.h>
+#include <linux/tcp.h>
+
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_helper.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <linux/netfilter/nf_conntrack_proto_gre.h>
+#include <linux/netfilter/nf_conntrack_pptp.h>
+
+#define NF_NAT_PPTP_VERSION "3.0"
+
+#define REQ_CID(req, off) (*(__be16 *)((char *)(req) + (off)))
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
+MODULE_DESCRIPTION("Netfilter NAT helper module for PPTP");
+MODULE_ALIAS("ip_nat_pptp");
+
+#if 0
+extern const char *pptp_msg_name[];
+#define DEBUGP(format, args...) printk(KERN_DEBUG "%s:%s: " format, __FILE__, \
+ __FUNCTION__, ## args)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static void pptp_nat_expected(struct nf_conn *ct,
+ struct nf_conntrack_expect *exp)
+{
+ struct nf_conn *master = ct->master;
+ struct nf_conntrack_expect *other_exp;
+ struct nf_conntrack_tuple t;
+ struct nf_ct_pptp_master *ct_pptp_info;
+ struct nf_nat_pptp *nat_pptp_info;
+ struct ip_nat_range range;
+
+ ct_pptp_info = &nfct_help(master)->help.ct_pptp_info;
+ nat_pptp_info = &nfct_nat(master)->help.nat_pptp_info;
+
+ /* And here goes the grand finale of corrosion... */
+ if (exp->dir == IP_CT_DIR_ORIGINAL) {
+ DEBUGP("we are PNS->PAC\n");
+ /* therefore, build tuple for PAC->PNS */
+ t.src.l3num = AF_INET;
+ t.src.u3.ip = master->tuplehash[!exp->dir].tuple.src.u3.ip;
+ t.src.u.gre.key = ct_pptp_info->pac_call_id;
+ t.dst.u3.ip = master->tuplehash[!exp->dir].tuple.dst.u3.ip;
+ t.dst.u.gre.key = ct_pptp_info->pns_call_id;
+ t.dst.protonum = IPPROTO_GRE;
+ } else {
+ DEBUGP("we are PAC->PNS\n");
+ /* build tuple for PNS->PAC */
+ t.src.l3num = AF_INET;
+ t.src.u3.ip = master->tuplehash[exp->dir].tuple.src.u3.ip;
+ t.src.u.gre.key = nat_pptp_info->pns_call_id;
+ t.dst.u3.ip = master->tuplehash[exp->dir].tuple.dst.u3.ip;
+ t.dst.u.gre.key = nat_pptp_info->pac_call_id;
+ t.dst.protonum = IPPROTO_GRE;
+ }
+
+ DEBUGP("trying to unexpect other dir: ");
+ NF_CT_DUMP_TUPLE(&t);
+ other_exp = nf_conntrack_expect_find_get(&t);
+ if (other_exp) {
+ nf_conntrack_unexpect_related(other_exp);
+ nf_conntrack_expect_put(other_exp);
+ DEBUGP("success\n");
+ } else {
+ DEBUGP("not found!\n");
+ }
+
+ /* This must be a fresh one. */
+ BUG_ON(ct->status & IPS_NAT_DONE_MASK);
+
+ /* Change src to where master sends to */
+ range.flags = IP_NAT_RANGE_MAP_IPS;
+ range.min_ip = range.max_ip
+ = ct->master->tuplehash[!exp->dir].tuple.dst.u3.ip;
+ if (exp->dir == IP_CT_DIR_ORIGINAL) {
+ range.flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
+ range.min = range.max = exp->saved_proto;
+ }
+ /* hook doesn't matter, but it has to do source manip */
+ nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
+
+ /* For DST manip, map port here to where it's expected. */
+ range.flags = IP_NAT_RANGE_MAP_IPS;
+ range.min_ip = range.max_ip
+ = ct->master->tuplehash[!exp->dir].tuple.src.u3.ip;
+ if (exp->dir == IP_CT_DIR_REPLY) {
+ range.flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
+ range.min = range.max = exp->saved_proto;
+ }
+ /* hook doesn't matter, but it has to do destination manip */
+ nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
+}
+
+/* outbound packets == from PNS to PAC */
+static int
+pptp_outbound_pkt(struct sk_buff **pskb,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ struct PptpControlHeader *ctlh,
+ union pptp_ctrl_union *pptpReq)
+
+{
+ struct nf_ct_pptp_master *ct_pptp_info;
+ struct nf_nat_pptp *nat_pptp_info;
+ u_int16_t msg;
+ __be16 new_callid;
+ unsigned int cid_off;
+
+ ct_pptp_info = &nfct_help(ct)->help.ct_pptp_info;
+ nat_pptp_info = &nfct_nat(ct)->help.nat_pptp_info;
+
+ new_callid = ct_pptp_info->pns_call_id;
+
+ switch (msg = ntohs(ctlh->messageType)) {
+ case PPTP_OUT_CALL_REQUEST:
+ cid_off = offsetof(union pptp_ctrl_union, ocreq.callID);
+ /* FIXME: ideally we would want to reserve a call ID
+ * here. current netfilter NAT core is not able to do
+ * this :( For now we use TCP source port. This breaks
+ * multiple calls within one control session */
+
+ /* save original call ID in nat_info */
+ nat_pptp_info->pns_call_id = ct_pptp_info->pns_call_id;
+
+ /* don't use tcph->source since we are at a DSTmanip
+ * hook (e.g. PREROUTING) and pkt is not mangled yet */
+ new_callid = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u.tcp.port;
+
+ /* save new call ID in ct info */
+ ct_pptp_info->pns_call_id = new_callid;
+ break;
+ case PPTP_IN_CALL_REPLY:
+ cid_off = offsetof(union pptp_ctrl_union, icack.callID);
+ break;
+ case PPTP_CALL_CLEAR_REQUEST:
+ cid_off = offsetof(union pptp_ctrl_union, clrreq.callID);
+ break;
+ default:
+ DEBUGP("unknown outbound packet 0x%04x:%s\n", msg,
+ (msg <= PPTP_MSG_MAX)?
+ pptp_msg_name[msg]:pptp_msg_name[0]);
+ /* fall through */
+ case PPTP_SET_LINK_INFO:
+ /* only need to NAT in case PAC is behind NAT box */
+ case PPTP_START_SESSION_REQUEST:
+ case PPTP_START_SESSION_REPLY:
+ case PPTP_STOP_SESSION_REQUEST:
+ case PPTP_STOP_SESSION_REPLY:
+ case PPTP_ECHO_REQUEST:
+ case PPTP_ECHO_REPLY:
+ /* no need to alter packet */
+ return NF_ACCEPT;
+ }
+
+ /* only OUT_CALL_REQUEST, IN_CALL_REPLY, CALL_CLEAR_REQUEST pass
+ * down to here */
+ DEBUGP("altering call id from 0x%04x to 0x%04x\n",
+ ntohs(REQ_CID(pptpReq, cid_off)), ntohs(new_callid));
+
+ /* mangle packet */
+ if (nf_nat_mangle_tcp_packet(pskb, ct, ctinfo,
+ cid_off + sizeof(struct pptp_pkt_hdr) +
+ sizeof(struct PptpControlHeader),
+ sizeof(new_callid), (char *)&new_callid,
+ sizeof(new_callid)) == 0)
+ return NF_DROP;
+ return NF_ACCEPT;
+}
+
+static void
+pptp_exp_gre(struct nf_conntrack_expect *expect_orig,
+ struct nf_conntrack_expect *expect_reply)
+{
+ struct nf_conn *ct = expect_orig->master;
+ struct nf_ct_pptp_master *ct_pptp_info;
+ struct nf_nat_pptp *nat_pptp_info;
+
+ ct_pptp_info = &nfct_help(ct)->help.ct_pptp_info;
+ nat_pptp_info = &nfct_nat(ct)->help.nat_pptp_info;
+
+ /* save original PAC call ID in nat_info */
+ nat_pptp_info->pac_call_id = ct_pptp_info->pac_call_id;
+
+ /* alter expectation for PNS->PAC direction */
+ expect_orig->saved_proto.gre.key = ct_pptp_info->pns_call_id;
+ expect_orig->tuple.src.u.gre.key = nat_pptp_info->pns_call_id;
+ expect_orig->tuple.dst.u.gre.key = ct_pptp_info->pac_call_id;
+ expect_orig->dir = IP_CT_DIR_ORIGINAL;
+
+ /* alter expectation for PAC->PNS direction */
+ expect_reply->saved_proto.gre.key = nat_pptp_info->pns_call_id;
+ expect_reply->tuple.src.u.gre.key = nat_pptp_info->pac_call_id;
+ expect_reply->tuple.dst.u.gre.key = ct_pptp_info->pns_call_id;
+ expect_reply->dir = IP_CT_DIR_REPLY;
+}
+
+/* inbound packets == from PAC to PNS */
+static int
+pptp_inbound_pkt(struct sk_buff **pskb,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ struct PptpControlHeader *ctlh,
+ union pptp_ctrl_union *pptpReq)
+{
+ struct nf_nat_pptp *nat_pptp_info;
+ u_int16_t msg;
+ __be16 new_pcid;
+ unsigned int pcid_off;
+
+ nat_pptp_info = &nfct_nat(ct)->help.nat_pptp_info;
+ new_pcid = nat_pptp_info->pns_call_id;
+
+ switch (msg = ntohs(ctlh->messageType)) {
+ case PPTP_OUT_CALL_REPLY:
+ pcid_off = offsetof(union pptp_ctrl_union, ocack.peersCallID);
+ break;
+ case PPTP_IN_CALL_CONNECT:
+ pcid_off = offsetof(union pptp_ctrl_union, iccon.peersCallID);
+ break;
+ case PPTP_IN_CALL_REQUEST:
+ /* only need to nat in case PAC is behind NAT box */
+ return NF_ACCEPT;
+ case PPTP_WAN_ERROR_NOTIFY:
+ pcid_off = offsetof(union pptp_ctrl_union, wanerr.peersCallID);
+ break;
+ case PPTP_CALL_DISCONNECT_NOTIFY:
+ pcid_off = offsetof(union pptp_ctrl_union, disc.callID);
+ break;
+ case PPTP_SET_LINK_INFO:
+ pcid_off = offsetof(union pptp_ctrl_union, setlink.peersCallID);
+ break;
+ default:
+ DEBUGP("unknown inbound packet %s\n", (msg <= PPTP_MSG_MAX)?
+ pptp_msg_name[msg]:pptp_msg_name[0]);
+ /* fall through */
+ case PPTP_START_SESSION_REQUEST:
+ case PPTP_START_SESSION_REPLY:
+ case PPTP_STOP_SESSION_REQUEST:
+ case PPTP_STOP_SESSION_REPLY:
+ case PPTP_ECHO_REQUEST:
+ case PPTP_ECHO_REPLY:
+ /* no need to alter packet */
+ return NF_ACCEPT;
+ }
+
+ /* only OUT_CALL_REPLY, IN_CALL_CONNECT, IN_CALL_REQUEST,
+ * WAN_ERROR_NOTIFY, CALL_DISCONNECT_NOTIFY pass down here */
+
+ /* mangle packet */
+ DEBUGP("altering peer call id from 0x%04x to 0x%04x\n",
+ ntohs(REQ_CID(pptpReq, pcid_off)), ntohs(new_pcid));
+
+ if (nf_nat_mangle_tcp_packet(pskb, ct, ctinfo,
+ pcid_off + sizeof(struct pptp_pkt_hdr) +
+ sizeof(struct PptpControlHeader),
+ sizeof(new_pcid), (char *)&new_pcid,
+ sizeof(new_pcid)) == 0)
+ return NF_DROP;
+ return NF_ACCEPT;
+}
+
+static int __init nf_nat_helper_pptp_init(void)
+{
+ nf_nat_need_gre();
+
+ BUG_ON(rcu_dereference(nf_nat_pptp_hook_outbound));
+ rcu_assign_pointer(nf_nat_pptp_hook_outbound, pptp_outbound_pkt);
+
+ BUG_ON(rcu_dereference(nf_nat_pptp_hook_inbound));
+ rcu_assign_pointer(nf_nat_pptp_hook_inbound, pptp_inbound_pkt);
+
+ BUG_ON(rcu_dereference(nf_nat_pptp_hook_exp_gre));
+ rcu_assign_pointer(nf_nat_pptp_hook_exp_gre, pptp_exp_gre);
+
+ BUG_ON(rcu_dereference(nf_nat_pptp_hook_expectfn));
+ rcu_assign_pointer(nf_nat_pptp_hook_expectfn, pptp_nat_expected);
+ return 0;
+}
+
+static void __exit nf_nat_helper_pptp_fini(void)
+{
+ rcu_assign_pointer(nf_nat_pptp_hook_expectfn, NULL);
+ rcu_assign_pointer(nf_nat_pptp_hook_exp_gre, NULL);
+ rcu_assign_pointer(nf_nat_pptp_hook_inbound, NULL);
+ rcu_assign_pointer(nf_nat_pptp_hook_outbound, NULL);
+ synchronize_rcu();
+}
+
+module_init(nf_nat_helper_pptp_init);
+module_exit(nf_nat_helper_pptp_fini);
diff --git a/net/ipv4/netfilter/nf_nat_proto_gre.c b/net/ipv4/netfilter/nf_nat_proto_gre.c
new file mode 100644
index 0000000..d3de579
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_proto_gre.c
@@ -0,0 +1,179 @@
+/*
+ * nf_nat_proto_gre.c
+ *
+ * NAT protocol helper module for GRE.
+ *
+ * GRE is a generic encapsulation protocol, which is generally not very
+ * suited for NAT, as it has no protocol-specific part as port numbers.
+ *
+ * It has an optional key field, which may help us distinguishing two
+ * connections between the same two hosts.
+ *
+ * GRE is defined in RFC 1701 and RFC 1702, as well as RFC 2784
+ *
+ * PPTP is built on top of a modified version of GRE, and has a mandatory
+ * field called "CallID", which serves us for the same purpose as the key
+ * field in plain GRE.
+ *
+ * Documentation about PPTP can be found in RFC 2637
+ *
+ * (C) 2000-2005 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_nat_protocol.h>
+#include <linux/netfilter/nf_conntrack_proto_gre.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
+MODULE_DESCRIPTION("Netfilter NAT protocol helper module for GRE");
+
+#if 0
+#define DEBUGP(format, args...) printk(KERN_DEBUG "%s:%s: " format, __FILE__, \
+ __FUNCTION__, ## args)
+#else
+#define DEBUGP(x, args...)
+#endif
+
+/* is key in given range between min and max */
+static int
+gre_in_range(const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype,
+ const union nf_conntrack_man_proto *min,
+ const union nf_conntrack_man_proto *max)
+{
+ __be16 key;
+
+ if (maniptype == IP_NAT_MANIP_SRC)
+ key = tuple->src.u.gre.key;
+ else
+ key = tuple->dst.u.gre.key;
+
+ return ntohs(key) >= ntohs(min->gre.key) &&
+ ntohs(key) <= ntohs(max->gre.key);
+}
+
+/* generate unique tuple ... */
+static int
+gre_unique_tuple(struct nf_conntrack_tuple *tuple,
+ const struct nf_nat_range *range,
+ enum nf_nat_manip_type maniptype,
+ const struct nf_conn *conntrack)
+{
+ static u_int16_t key;
+ __be16 *keyptr;
+ unsigned int min, i, range_size;
+
+ if (maniptype == IP_NAT_MANIP_SRC)
+ keyptr = &tuple->src.u.gre.key;
+ else
+ keyptr = &tuple->dst.u.gre.key;
+
+ if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
+ DEBUGP("%p: NATing GRE PPTP\n", conntrack);
+ min = 1;
+ range_size = 0xffff;
+ } else {
+ min = ntohs(range->min.gre.key);
+ range_size = ntohs(range->max.gre.key) - min + 1;
+ }
+
+ DEBUGP("min = %u, range_size = %u\n", min, range_size);
+
+ for (i = 0; i < range_size; i++, key++) {
+ *keyptr = htons(min + key % range_size);
+ if (!nf_nat_used_tuple(tuple, conntrack))
+ return 1;
+ }
+
+ DEBUGP("%p: no NAT mapping\n", conntrack);
+ return 0;
+}
+
+/* manipulate a GRE packet according to maniptype */
+static int
+gre_manip_pkt(struct sk_buff **pskb, unsigned int iphdroff,
+ const struct nf_conntrack_tuple *tuple,
+ enum nf_nat_manip_type maniptype)
+{
+ struct gre_hdr *greh;
+ struct gre_hdr_pptp *pgreh;
+ struct iphdr *iph = (struct iphdr *)((*pskb)->data + iphdroff);
+ unsigned int hdroff = iphdroff + iph->ihl * 4;
+
+ /* pgreh includes two optional 32bit fields which are not required
+ * to be there. That's where the magic '8' comes from */
+ if (!skb_make_writable(pskb, hdroff + sizeof(*pgreh) - 8))
+ return 0;
+
+ greh = (void *)(*pskb)->data + hdroff;
+ pgreh = (struct gre_hdr_pptp *)greh;
+
+ /* we only have destination manip of a packet, since 'source key'
+ * is not present in the packet itself */
+ if (maniptype != IP_NAT_MANIP_DST)
+ return 1;
+ switch (greh->version) {
+ case 0:
+ if (!greh->key) {
+ DEBUGP("can't nat GRE w/o key\n");
+ break;
+ }
+ if (greh->csum) {
+ /* FIXME: Never tested this code... */
+ nf_proto_csum_replace4(gre_csum(greh), *pskb,
+ *(gre_key(greh)),
+ tuple->dst.u.gre.key, 0);
+ }
+ *(gre_key(greh)) = tuple->dst.u.gre.key;
+ break;
+ case GRE_VERSION_PPTP:
+ DEBUGP("call_id -> 0x%04x\n", ntohs(tuple->dst.u.gre.key));
+ pgreh->call_id = tuple->dst.u.gre.key;
+ break;
+ default:
+ DEBUGP("can't nat unknown GRE version\n");
+ return 0;
+ }
+ return 1;
+}
+
+static struct nf_nat_protocol gre __read_mostly = {
+ .name = "GRE",
+ .protonum = IPPROTO_GRE,
+ .manip_pkt = gre_manip_pkt,
+ .in_range = gre_in_range,
+ .unique_tuple = gre_unique_tuple,
+#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
+ defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
+ .range_to_nfattr = nf_nat_port_range_to_nfattr,
+ .nfattr_to_range = nf_nat_port_nfattr_to_range,
+#endif
+};
+
+int __init nf_nat_proto_gre_init(void)
+{
+ return nf_nat_protocol_register(&gre);
+}
+
+void __exit nf_nat_proto_gre_fini(void)
+{
+ nf_nat_protocol_unregister(&gre);
+}
+
+module_init(nf_nat_proto_gre_init);
+module_exit(nf_nat_proto_gre_fini);
+
+void nf_nat_need_gre(void)
+{
+ return;
+}
+EXPORT_SYMBOL_GPL(nf_nat_need_gre);
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index d1a365d..6b2eb26 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -120,6 +120,10 @@ config NF_CONNTRACK_EVENTS
If unsure, say `N'.
+config NF_CT_PROTO_GRE
+ tristate
+ depends on EXPERIMENTAL && NF_CONNTRACK
+
config NF_CT_PROTO_SCTP
tristate 'SCTP protocol on new connection tracking support (EXPERIMENTAL)'
depends on EXPERIMENTAL && NF_CONNTRACK
@@ -213,6 +217,25 @@ config NF_CONNTRACK_NETBIOS_NS
To compile it as a module, choose M here. If unsure, say N.
+config NF_CONNTRACK_PPTP
+ tristate "PPtP protocol support (EXPERIMENTAL)"
+ depends on EXPERIMENTAL && NF_CONNTRACK
+ select NF_CT_PROTO_GRE
+ help
+ This module adds support for PPTP (Point to Point Tunnelling
+ Protocol, RFC2637) connection tracking and NAT.
+
+ If you are running PPTP sessions over a stateful firewall or NAT
+ box, you may want to enable this feature.
+
+ Please note that not all PPTP modes of operation are supported yet.
+ Specifically these limitations exist:
+ - Blindy assumes that control connections are always established
+ in PNS->PAC direction. This is a violation of RFC2637.
+ - Only supports a single call within each session
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config NF_CT_NETLINK
tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 67144b2..897bed4 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -14,6 +14,7 @@ # connection tracking
obj-$(CONFIG_NF_CONNTRACK) += nf_conntrack.o
# SCTP protocol connection tracking
+obj-$(CONFIG_NF_CT_PROTO_GRE) += nf_conntrack_proto_gre.o
obj-$(CONFIG_NF_CT_PROTO_SCTP) += nf_conntrack_proto_sctp.o
# netlink interface for nf_conntrack
@@ -27,6 +28,7 @@ obj-$(CONFIG_NF_CONNTRACK_FTP) += nf_con
obj-$(CONFIG_NF_CONNTRACK_H323) += nf_conntrack_h323.o
obj-$(CONFIG_NF_CONNTRACK_IRC) += nf_conntrack_irc.o
obj-$(CONFIG_NF_CONNTRACK_NETBIOS_NS) += nf_conntrack_netbios_ns.o
+obj-$(CONFIG_NF_CONNTRACK_PPTP) += nf_conntrack_pptp.o
# generic X tables
obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index aa8beab..ed756c9 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -300,6 +300,7 @@ static void
destroy_conntrack(struct nf_conntrack *nfct)
{
struct nf_conn *ct = (struct nf_conn *)nfct;
+ struct nf_conn_help *help = nfct_help(ct);
struct nf_conntrack_l3proto *l3proto;
struct nf_conntrack_l4proto *l4proto;
@@ -310,6 +311,9 @@ destroy_conntrack(struct nf_conntrack *n
nf_conntrack_event(IPCT_DESTROY, ct);
set_bit(IPS_DYING_BIT, &ct->status);
+ if (help && help->helper && help->helper->destroy)
+ help->helper->destroy(ct);
+
/* To make sure we don't get any weird locking issues here:
* destroy_conntrack() MUST NOT be called with a write lock
* to nf_conntrack_lock!!! -HW */
diff --git a/net/netfilter/nf_conntrack_pptp.c b/net/netfilter/nf_conntrack_pptp.c
new file mode 100644
index 0000000..f0ff00e
--- /dev/null
+++ b/net/netfilter/nf_conntrack_pptp.c
@@ -0,0 +1,607 @@
+/*
+ * Connection tracking support for PPTP (Point to Point Tunneling Protocol).
+ * PPTP is a a protocol for creating virtual private networks.
+ * It is a specification defined by Microsoft and some vendors
+ * working with Microsoft. PPTP is built on top of a modified
+ * version of the Internet Generic Routing Encapsulation Protocol.
+ * GRE is defined in RFC 1701 and RFC 1702. Documentation of
+ * PPTP can be found in RFC 2637
+ *
+ * (C) 2000-2005 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ *
+ * Limitations:
+ * - We blindly assume that control connections are always
+ * established in PNS->PAC direction. This is a violation
+ * of RFFC2673
+ * - We can only support one single call within each session
+ * TODO:
+ * - testing of incoming PPTP calls
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/tcp.h>
+
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <linux/netfilter/nf_conntrack_proto_gre.h>
+#include <linux/netfilter/nf_conntrack_pptp.h>
+
+#define NF_CT_PPTP_VERSION "3.1"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
+MODULE_DESCRIPTION("Netfilter connection tracking helper module for PPTP");
+MODULE_ALIAS("ip_conntrack_pptp");
+
+static DEFINE_SPINLOCK(nf_pptp_lock);
+
+int
+(*nf_nat_pptp_hook_outbound)(struct sk_buff **pskb,
+ struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+ struct PptpControlHeader *ctlh,
+ union pptp_ctrl_union *pptpReq) __read_mostly;
+EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_outbound);
+
+int
+(*nf_nat_pptp_hook_inbound)(struct sk_buff **pskb,
+ struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+ struct PptpControlHeader *ctlh,
+ union pptp_ctrl_union *pptpReq) __read_mostly;
+EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_inbound);
+
+void
+(*nf_nat_pptp_hook_exp_gre)(struct nf_conntrack_expect *expect_orig,
+ struct nf_conntrack_expect *expect_reply)
+ __read_mostly;
+EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_exp_gre);
+
+void
+(*nf_nat_pptp_hook_expectfn)(struct nf_conn *ct,
+ struct nf_conntrack_expect *exp) __read_mostly;
+EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_expectfn);
+
+#if 0
+/* PptpControlMessageType names */
+const char *pptp_msg_name[] = {
+ "UNKNOWN_MESSAGE",
+ "START_SESSION_REQUEST",
+ "START_SESSION_REPLY",
+ "STOP_SESSION_REQUEST",
+ "STOP_SESSION_REPLY",
+ "ECHO_REQUEST",
+ "ECHO_REPLY",
+ "OUT_CALL_REQUEST",
+ "OUT_CALL_REPLY",
+ "IN_CALL_REQUEST",
+ "IN_CALL_REPLY",
+ "IN_CALL_CONNECT",
+ "CALL_CLEAR_REQUEST",
+ "CALL_DISCONNECT_NOTIFY",
+ "WAN_ERROR_NOTIFY",
+ "SET_LINK_INFO"
+};
+EXPORT_SYMBOL(pptp_msg_name);
+#define DEBUGP(format, args...) printk(KERN_DEBUG "%s:%s: " format, __FILE__, __FUNCTION__, ## args)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+#define SECS *HZ
+#define MINS * 60 SECS
+#define HOURS * 60 MINS
+
+#define PPTP_GRE_TIMEOUT (10 MINS)
+#define PPTP_GRE_STREAM_TIMEOUT (5 HOURS)
+
+static void pptp_expectfn(struct nf_conn *ct,
+ struct nf_conntrack_expect *exp)
+{
+ typeof(nf_nat_pptp_hook_expectfn) nf_nat_pptp_expectfn;
+ DEBUGP("increasing timeouts\n");
+
+ /* increase timeout of GRE data channel conntrack entry */
+ ct->proto.gre.timeout = PPTP_GRE_TIMEOUT;
+ ct->proto.gre.stream_timeout = PPTP_GRE_STREAM_TIMEOUT;
+
+ /* Can you see how rusty this code is, compared with the pre-2.6.11
+ * one? That's what happened to my shiny newnat of 2002 ;( -HW */
+
+ rcu_read_lock();
+ nf_nat_pptp_expectfn = rcu_dereference(nf_nat_pptp_hook_expectfn);
+ if (nf_nat_pptp_expectfn && ct->status & IPS_NAT_MASK)
+ nf_nat_pptp_expectfn(ct, exp);
+ else {
+ struct nf_conntrack_tuple inv_t;
+ struct nf_conntrack_expect *exp_other;
+
+ /* obviously this tuple inversion only works until you do NAT */
+ nf_ct_invert_tuplepr(&inv_t, &exp->tuple);
+ DEBUGP("trying to unexpect other dir: ");
+ NF_CT_DUMP_TUPLE(&inv_t);
+
+ exp_other = nf_conntrack_expect_find_get(&inv_t);
+ if (exp_other) {
+ /* delete other expectation. */
+ DEBUGP("found\n");
+ nf_conntrack_unexpect_related(exp_other);
+ nf_conntrack_expect_put(exp_other);
+ } else {
+ DEBUGP("not found\n");
+ }
+ }
+ rcu_read_unlock();
+}
+
+static int destroy_sibling_or_exp(const struct nf_conntrack_tuple *t)
+{
+ struct nf_conntrack_tuple_hash *h;
+ struct nf_conntrack_expect *exp;
+ struct nf_conn *sibling;
+
+ DEBUGP("trying to timeout ct or exp for tuple ");
+ NF_CT_DUMP_TUPLE(t);
+
+ h = nf_conntrack_find_get(t, NULL);
+ if (h) {
+ sibling = nf_ct_tuplehash_to_ctrack(h);
+ DEBUGP("setting timeout of conntrack %p to 0\n", sibling);
+ sibling->proto.gre.timeout = 0;
+ sibling->proto.gre.stream_timeout = 0;
+ if (del_timer(&sibling->timeout))
+ sibling->timeout.function((unsigned long)sibling);
+ nf_ct_put(sibling);
+ return 1;
+ } else {
+ exp = nf_conntrack_expect_find_get(t);
+ if (exp) {
+ DEBUGP("unexpect_related of expect %p\n", exp);
+ nf_conntrack_unexpect_related(exp);
+ nf_conntrack_expect_put(exp);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/* timeout GRE data connections */
+static void pptp_destroy_siblings(struct nf_conn *ct)
+{
+ struct nf_conn_help *help = nfct_help(ct);
+ struct nf_conntrack_tuple t;
+
+ nf_ct_gre_keymap_destroy(ct);
+
+ /* try original (pns->pac) tuple */
+ memcpy(&t, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, sizeof(t));
+ t.dst.protonum = IPPROTO_GRE;
+ t.src.u.gre.key = help->help.ct_pptp_info.pns_call_id;
+ t.dst.u.gre.key = help->help.ct_pptp_info.pac_call_id;
+ if (!destroy_sibling_or_exp(&t))
+ DEBUGP("failed to timeout original pns->pac ct/exp\n");
+
+ /* try reply (pac->pns) tuple */
+ memcpy(&t, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, sizeof(t));
+ t.dst.protonum = IPPROTO_GRE;
+ t.src.u.gre.key = help->help.ct_pptp_info.pac_call_id;
+ t.dst.u.gre.key = help->help.ct_pptp_info.pns_call_id;
+ if (!destroy_sibling_or_exp(&t))
+ DEBUGP("failed to timeout reply pac->pns ct/exp\n");
+}
+
+/* expect GRE connections (PNS->PAC and PAC->PNS direction) */
+static int exp_gre(struct nf_conn *ct, __be16 callid, __be16 peer_callid)
+{
+ struct nf_conntrack_expect *exp_orig, *exp_reply;
+ enum ip_conntrack_dir dir;
+ int ret = 1;
+ typeof(nf_nat_pptp_hook_exp_gre) nf_nat_pptp_exp_gre;
+
+ exp_orig = nf_conntrack_expect_alloc(ct);
+ if (exp_orig == NULL)
+ goto out;
+
+ exp_reply = nf_conntrack_expect_alloc(ct);
+ if (exp_reply == NULL)
+ goto out_put_orig;
+
+ /* original direction, PNS->PAC */
+ dir = IP_CT_DIR_ORIGINAL;
+ nf_conntrack_expect_init(exp_orig, ct->tuplehash[dir].tuple.src.l3num,
+ &ct->tuplehash[dir].tuple.src.u3,
+ &ct->tuplehash[dir].tuple.dst.u3,
+ IPPROTO_GRE, &peer_callid, &callid);
+ exp_orig->expectfn = pptp_expectfn;
+
+ /* reply direction, PAC->PNS */
+ dir = IP_CT_DIR_REPLY;
+ nf_conntrack_expect_init(exp_reply, ct->tuplehash[dir].tuple.src.l3num,
+ &ct->tuplehash[dir].tuple.src.u3,
+ &ct->tuplehash[dir].tuple.dst.u3,
+ IPPROTO_GRE, &callid, &peer_callid);
+ exp_reply->expectfn = pptp_expectfn;
+
+ nf_nat_pptp_exp_gre = rcu_dereference(nf_nat_pptp_hook_exp_gre);
+ if (nf_nat_pptp_exp_gre && ct->status & IPS_NAT_MASK)
+ nf_nat_pptp_exp_gre(exp_orig, exp_reply);
+ if (nf_conntrack_expect_related(exp_orig) != 0)
+ goto out_put_both;
+ if (nf_conntrack_expect_related(exp_reply) != 0)
+ goto out_unexpect_orig;
+
+ /* Add GRE keymap entries */
+ if (nf_ct_gre_keymap_add(ct, IP_CT_DIR_ORIGINAL, &exp_orig->tuple) != 0)
+ goto out_unexpect_both;
+ if (nf_ct_gre_keymap_add(ct, IP_CT_DIR_REPLY, &exp_reply->tuple) != 0) {
+ nf_ct_gre_keymap_destroy(ct);
+ goto out_unexpect_both;
+ }
+ ret = 0;
+
+out_put_both:
+ nf_conntrack_expect_put(exp_reply);
+out_put_orig:
+ nf_conntrack_expect_put(exp_orig);
+out:
+ return ret;
+
+out_unexpect_both:
+ nf_conntrack_unexpect_related(exp_reply);
+out_unexpect_orig:
+ nf_conntrack_unexpect_related(exp_orig);
+ goto out_put_both;
+}
+
+static inline int
+pptp_inbound_pkt(struct sk_buff **pskb,
+ struct PptpControlHeader *ctlh,
+ union pptp_ctrl_union *pptpReq,
+ unsigned int reqlen,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ struct nf_ct_pptp_master *info = &nfct_help(ct)->help.ct_pptp_info;
+ u_int16_t msg;
+ __be16 cid = 0, pcid = 0;
+ typeof(nf_nat_pptp_hook_inbound) nf_nat_pptp_inbound;
+
+ msg = ntohs(ctlh->messageType);
+ DEBUGP("inbound control message %s\n", pptp_msg_name[msg]);
+
+ switch (msg) {
+ case PPTP_START_SESSION_REPLY:
+ /* server confirms new control session */
+ if (info->sstate < PPTP_SESSION_REQUESTED)
+ goto invalid;
+ if (pptpReq->srep.resultCode == PPTP_START_OK)
+ info->sstate = PPTP_SESSION_CONFIRMED;
+ else
+ info->sstate = PPTP_SESSION_ERROR;
+ break;
+
+ case PPTP_STOP_SESSION_REPLY:
+ /* server confirms end of control session */
+ if (info->sstate > PPTP_SESSION_STOPREQ)
+ goto invalid;
+ if (pptpReq->strep.resultCode == PPTP_STOP_OK)
+ info->sstate = PPTP_SESSION_NONE;
+ else
+ info->sstate = PPTP_SESSION_ERROR;
+ break;
+
+ case PPTP_OUT_CALL_REPLY:
+ /* server accepted call, we now expect GRE frames */
+ if (info->sstate != PPTP_SESSION_CONFIRMED)
+ goto invalid;
+ if (info->cstate != PPTP_CALL_OUT_REQ &&
+ info->cstate != PPTP_CALL_OUT_CONF)
+ goto invalid;
+
+ cid = pptpReq->ocack.callID;
+ pcid = pptpReq->ocack.peersCallID;
+ if (info->pns_call_id != pcid)
+ goto invalid;
+ DEBUGP("%s, CID=%X, PCID=%X\n", pptp_msg_name[msg],
+ ntohs(cid), ntohs(pcid));
+
+ if (pptpReq->ocack.resultCode == PPTP_OUTCALL_CONNECT) {
+ info->cstate = PPTP_CALL_OUT_CONF;
+ info->pac_call_id = cid;
+ exp_gre(ct, cid, pcid);
+ } else
+ info->cstate = PPTP_CALL_NONE;
+ break;
+
+ case PPTP_IN_CALL_REQUEST:
+ /* server tells us about incoming call request */
+ if (info->sstate != PPTP_SESSION_CONFIRMED)
+ goto invalid;
+
+ cid = pptpReq->icreq.callID;
+ DEBUGP("%s, CID=%X\n", pptp_msg_name[msg], ntohs(cid));
+ info->cstate = PPTP_CALL_IN_REQ;
+ info->pac_call_id = cid;
+ break;
+
+ case PPTP_IN_CALL_CONNECT:
+ /* server tells us about incoming call established */
+ if (info->sstate != PPTP_SESSION_CONFIRMED)
+ goto invalid;
+ if (info->cstate != PPTP_CALL_IN_REP &&
+ info->cstate != PPTP_CALL_IN_CONF)
+ goto invalid;
+
+ pcid = pptpReq->iccon.peersCallID;
+ cid = info->pac_call_id;
+
+ if (info->pns_call_id != pcid)
+ goto invalid;
+
+ DEBUGP("%s, PCID=%X\n", pptp_msg_name[msg], ntohs(pcid));
+ info->cstate = PPTP_CALL_IN_CONF;
+
+ /* we expect a GRE connection from PAC to PNS */
+ exp_gre(ct, cid, pcid);
+ break;
+
+ case PPTP_CALL_DISCONNECT_NOTIFY:
+ /* server confirms disconnect */
+ cid = pptpReq->disc.callID;
+ DEBUGP("%s, CID=%X\n", pptp_msg_name[msg], ntohs(cid));
+ info->cstate = PPTP_CALL_NONE;
+
+ /* untrack this call id, unexpect GRE packets */
+ pptp_destroy_siblings(ct);
+ break;
+
+ case PPTP_WAN_ERROR_NOTIFY:
+ case PPTP_ECHO_REQUEST:
+ case PPTP_ECHO_REPLY:
+ /* I don't have to explain these ;) */
+ break;
+
+ default:
+ goto invalid;
+ }
+
+ nf_nat_pptp_inbound = rcu_dereference(nf_nat_pptp_hook_inbound);
+ if (nf_nat_pptp_inbound && ct->status & IPS_NAT_MASK)
+ return nf_nat_pptp_inbound(pskb, ct, ctinfo, ctlh, pptpReq);
+ return NF_ACCEPT;
+
+invalid:
+ DEBUGP("invalid %s: type=%d cid=%u pcid=%u "
+ "cstate=%d sstate=%d pns_cid=%u pac_cid=%u\n",
+ msg <= PPTP_MSG_MAX ? pptp_msg_name[msg] : pptp_msg_name[0],
+ msg, ntohs(cid), ntohs(pcid), info->cstate, info->sstate,
+ ntohs(info->pns_call_id), ntohs(info->pac_call_id));
+ return NF_ACCEPT;
+}
+
+static inline int
+pptp_outbound_pkt(struct sk_buff **pskb,
+ struct PptpControlHeader *ctlh,
+ union pptp_ctrl_union *pptpReq,
+ unsigned int reqlen,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ struct nf_ct_pptp_master *info = &nfct_help(ct)->help.ct_pptp_info;
+ u_int16_t msg;
+ __be16 cid = 0, pcid = 0;
+ typeof(nf_nat_pptp_hook_outbound) nf_nat_pptp_outbound;
+
+ msg = ntohs(ctlh->messageType);
+ DEBUGP("outbound control message %s\n", pptp_msg_name[msg]);
+
+ switch (msg) {
+ case PPTP_START_SESSION_REQUEST:
+ /* client requests for new control session */
+ if (info->sstate != PPTP_SESSION_NONE)
+ goto invalid;
+ info->sstate = PPTP_SESSION_REQUESTED;
+ break;
+
+ case PPTP_STOP_SESSION_REQUEST:
+ /* client requests end of control session */
+ info->sstate = PPTP_SESSION_STOPREQ;
+ break;
+
+ case PPTP_OUT_CALL_REQUEST:
+ /* client initiating connection to server */
+ if (info->sstate != PPTP_SESSION_CONFIRMED)
+ goto invalid;
+ info->cstate = PPTP_CALL_OUT_REQ;
+ /* track PNS call id */
+ cid = pptpReq->ocreq.callID;
+ DEBUGP("%s, CID=%X\n", pptp_msg_name[msg], ntohs(cid));
+ info->pns_call_id = cid;
+ break;
+
+ case PPTP_IN_CALL_REPLY:
+ /* client answers incoming call */
+ if (info->cstate != PPTP_CALL_IN_REQ &&
+ info->cstate != PPTP_CALL_IN_REP)
+ goto invalid;
+
+ cid = pptpReq->icack.callID;
+ pcid = pptpReq->icack.peersCallID;
+ if (info->pac_call_id != pcid)
+ goto invalid;
+ DEBUGP("%s, CID=%X PCID=%X\n", pptp_msg_name[msg],
+ ntohs(cid), ntohs(pcid));
+
+ if (pptpReq->icack.resultCode == PPTP_INCALL_ACCEPT) {
+ /* part two of the three-way handshake */
+ info->cstate = PPTP_CALL_IN_REP;
+ info->pns_call_id = cid;
+ } else
+ info->cstate = PPTP_CALL_NONE;
+ break;
+
+ case PPTP_CALL_CLEAR_REQUEST:
+ /* client requests hangup of call */
+ if (info->sstate != PPTP_SESSION_CONFIRMED)
+ goto invalid;
+ /* FUTURE: iterate over all calls and check if
+ * call ID is valid. We don't do this without newnat,
+ * because we only know about last call */
+ info->cstate = PPTP_CALL_CLEAR_REQ;
+ break;
+
+ case PPTP_SET_LINK_INFO:
+ case PPTP_ECHO_REQUEST:
+ case PPTP_ECHO_REPLY:
+ /* I don't have to explain these ;) */
+ break;
+
+ default:
+ goto invalid;
+ }
+
+ nf_nat_pptp_outbound = rcu_dereference(nf_nat_pptp_hook_outbound);
+ if (nf_nat_pptp_outbound && ct->status & IPS_NAT_MASK)
+ return nf_nat_pptp_outbound(pskb, ct, ctinfo, ctlh, pptpReq);
+ return NF_ACCEPT;
+
+invalid:
+ DEBUGP("invalid %s: type=%d cid=%u pcid=%u "
+ "cstate=%d sstate=%d pns_cid=%u pac_cid=%u\n",
+ msg <= PPTP_MSG_MAX ? pptp_msg_name[msg] : pptp_msg_name[0],
+ msg, ntohs(cid), ntohs(pcid), info->cstate, info->sstate,
+ ntohs(info->pns_call_id), ntohs(info->pac_call_id));
+ return NF_ACCEPT;
+}
+
+static const unsigned int pptp_msg_size[] = {
+ [PPTP_START_SESSION_REQUEST] = sizeof(struct PptpStartSessionRequest),
+ [PPTP_START_SESSION_REPLY] = sizeof(struct PptpStartSessionReply),
+ [PPTP_STOP_SESSION_REQUEST] = sizeof(struct PptpStopSessionRequest),
+ [PPTP_STOP_SESSION_REPLY] = sizeof(struct PptpStopSessionReply),
+ [PPTP_OUT_CALL_REQUEST] = sizeof(struct PptpOutCallRequest),
+ [PPTP_OUT_CALL_REPLY] = sizeof(struct PptpOutCallReply),
+ [PPTP_IN_CALL_REQUEST] = sizeof(struct PptpInCallRequest),
+ [PPTP_IN_CALL_REPLY] = sizeof(struct PptpInCallReply),
+ [PPTP_IN_CALL_CONNECT] = sizeof(struct PptpInCallConnected),
+ [PPTP_CALL_CLEAR_REQUEST] = sizeof(struct PptpClearCallRequest),
+ [PPTP_CALL_DISCONNECT_NOTIFY] = sizeof(struct PptpCallDisconnectNotify),
+ [PPTP_WAN_ERROR_NOTIFY] = sizeof(struct PptpWanErrorNotify),
+ [PPTP_SET_LINK_INFO] = sizeof(struct PptpSetLinkInfo),
+};
+
+/* track caller id inside control connection, call expect_related */
+static int
+conntrack_pptp_help(struct sk_buff **pskb, unsigned int protoff,
+ struct nf_conn *ct, enum ip_conntrack_info ctinfo)
+
+{
+ int dir = CTINFO2DIR(ctinfo);
+ struct nf_ct_pptp_master *info = &nfct_help(ct)->help.ct_pptp_info;
+ struct tcphdr _tcph, *tcph;
+ struct pptp_pkt_hdr _pptph, *pptph;
+ struct PptpControlHeader _ctlh, *ctlh;
+ union pptp_ctrl_union _pptpReq, *pptpReq;
+ unsigned int tcplen = (*pskb)->len - protoff;
+ unsigned int datalen, reqlen, nexthdr_off;
+ int oldsstate, oldcstate;
+ int ret;
+ u_int16_t msg;
+
+ /* don't do any tracking before tcp handshake complete */
+ if (ctinfo != IP_CT_ESTABLISHED &&
+ ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY)
+ return NF_ACCEPT;
+
+ nexthdr_off = protoff;
+ tcph = skb_header_pointer(*pskb, nexthdr_off, sizeof(_tcph), &_tcph);
+ BUG_ON(!tcph);
+ nexthdr_off += tcph->doff * 4;
+ datalen = tcplen - tcph->doff * 4;
+
+ pptph = skb_header_pointer(*pskb, nexthdr_off, sizeof(_pptph), &_pptph);
+ if (!pptph) {
+ DEBUGP("no full PPTP header, can't track\n");
+ return NF_ACCEPT;
+ }
+ nexthdr_off += sizeof(_pptph);
+ datalen -= sizeof(_pptph);
+
+ /* if it's not a control message we can't do anything with it */
+ if (ntohs(pptph->packetType) != PPTP_PACKET_CONTROL ||
+ ntohl(pptph->magicCookie) != PPTP_MAGIC_COOKIE) {
+ DEBUGP("not a control packet\n");
+ return NF_ACCEPT;
+ }
+
+ ctlh = skb_header_pointer(*pskb, nexthdr_off, sizeof(_ctlh), &_ctlh);
+ if (!ctlh)
+ return NF_ACCEPT;
+ nexthdr_off += sizeof(_ctlh);
+ datalen -= sizeof(_ctlh);
+
+ reqlen = datalen;
+ msg = ntohs(ctlh->messageType);
+ if (msg > 0 && msg <= PPTP_MSG_MAX && reqlen < pptp_msg_size[msg])
+ return NF_ACCEPT;
+ if (reqlen > sizeof(*pptpReq))
+ reqlen = sizeof(*pptpReq);
+
+ pptpReq = skb_header_pointer(*pskb, nexthdr_off, reqlen, &_pptpReq);
+ if (!pptpReq)
+ return NF_ACCEPT;
+
+ oldsstate = info->sstate;
+ oldcstate = info->cstate;
+
+ spin_lock_bh(&nf_pptp_lock);
+
+ /* FIXME: We just blindly assume that the control connection is always
+ * established from PNS->PAC. However, RFC makes no guarantee */
+ if (dir == IP_CT_DIR_ORIGINAL)
+ /* client -> server (PNS -> PAC) */
+ ret = pptp_outbound_pkt(pskb, ctlh, pptpReq, reqlen, ct,
+ ctinfo);
+ else
+ /* server -> client (PAC -> PNS) */
+ ret = pptp_inbound_pkt(pskb, ctlh, pptpReq, reqlen, ct,
+ ctinfo);
+ DEBUGP("sstate: %d->%d, cstate: %d->%d\n",
+ oldsstate, info->sstate, oldcstate, info->cstate);
+ spin_unlock_bh(&nf_pptp_lock);
+
+ return ret;
+}
+
+/* control protocol helper */
+static struct nf_conntrack_helper pptp __read_mostly = {
+ .name = "pptp",
+ .me = THIS_MODULE,
+ .max_expected = 2,
+ .timeout = 5 * 60,
+ .tuple.src.l3num = AF_INET,
+ .tuple.src.u.tcp.port = __constant_htons(PPTP_CONTROL_PORT),
+ .tuple.dst.protonum = IPPROTO_TCP,
+ .mask.src.l3num = 0xffff,
+ .mask.src.u.tcp.port = __constant_htons(0xffff),
+ .mask.dst.protonum = 0xff,
+ .help = conntrack_pptp_help,
+ .destroy = pptp_destroy_siblings,
+};
+
+static int __init nf_conntrack_pptp_init(void)
+{
+ return nf_conntrack_helper_register(&pptp);
+}
+
+static void __exit nf_conntrack_pptp_fini(void)
+{
+ nf_conntrack_helper_unregister(&pptp);
+ nf_ct_gre_keymap_flush();
+}
+
+module_init(nf_conntrack_pptp_init);
+module_exit(nf_conntrack_pptp_fini);
diff --git a/net/netfilter/nf_conntrack_proto_gre.c b/net/netfilter/nf_conntrack_proto_gre.c
new file mode 100644
index 0000000..ac193ce
--- /dev/null
+++ b/net/netfilter/nf_conntrack_proto_gre.c
@@ -0,0 +1,305 @@
+/*
+ * ip_conntrack_proto_gre.c - Version 3.0
+ *
+ * Connection tracking protocol helper module for GRE.
+ *
+ * GRE is a generic encapsulation protocol, which is generally not very
+ * suited for NAT, as it has no protocol-specific part as port numbers.
+ *
+ * It has an optional key field, which may help us distinguishing two
+ * connections between the same two hosts.
+ *
+ * GRE is defined in RFC 1701 and RFC 1702, as well as RFC 2784
+ *
+ * PPTP is built on top of a modified version of GRE, and has a mandatory
+ * field called "CallID", which serves us for the same purpose as the key
+ * field in plain GRE.
+ *
+ * Documentation about PPTP can be found in RFC 2637
+ *
+ * (C) 2000-2005 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/seq_file.h>
+#include <linux/in.h>
+#include <linux/skbuff.h>
+
+#include <net/netfilter/nf_conntrack_l4proto.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_core.h>
+#include <linux/netfilter/nf_conntrack_proto_gre.h>
+#include <linux/netfilter/nf_conntrack_pptp.h>
+
+#define GRE_TIMEOUT (30 * HZ)
+#define GRE_STREAM_TIMEOUT (180 * HZ)
+
+#if 0
+#define DEBUGP(format, args...) printk(KERN_DEBUG "%s:%s: " format, __FILE__, __FUNCTION__, ## args)
+#else
+#define DEBUGP(x, args...)
+#endif
+
+static DEFINE_RWLOCK(nf_ct_gre_lock);
+static LIST_HEAD(gre_keymap_list);
+
+void nf_ct_gre_keymap_flush(void)
+{
+ struct list_head *pos, *n;
+
+ write_lock_bh(&nf_ct_gre_lock);
+ list_for_each_safe(pos, n, &gre_keymap_list) {
+ list_del(pos);
+ kfree(pos);
+ }
+ write_unlock_bh(&nf_ct_gre_lock);
+}
+EXPORT_SYMBOL(nf_ct_gre_keymap_flush);
+
+static inline int gre_key_cmpfn(const struct nf_ct_gre_keymap *km,
+ const struct nf_conntrack_tuple *t)
+{
+ return km->tuple.src.l3num == t->src.l3num &&
+ !memcmp(&km->tuple.src.u3, &t->src.u3, sizeof(t->src.u3)) &&
+ !memcmp(&km->tuple.dst.u3, &t->dst.u3, sizeof(t->dst.u3)) &&
+ km->tuple.dst.protonum == t->dst.protonum &&
+ km->tuple.dst.u.all == t->dst.u.all;
+}
+
+/* look up the source key for a given tuple */
+static __be16 gre_keymap_lookup(struct nf_conntrack_tuple *t)
+{
+ struct nf_ct_gre_keymap *km;
+ __be16 key = 0;
+
+ read_lock_bh(&nf_ct_gre_lock);
+ list_for_each_entry(km, &gre_keymap_list, list) {
+ if (gre_key_cmpfn(km, t)) {
+ key = km->tuple.src.u.gre.key;
+ break;
+ }
+ }
+ read_unlock_bh(&nf_ct_gre_lock);
+
+ DEBUGP("lookup src key 0x%x for ", key);
+ NF_CT_DUMP_TUPLE(t);
+
+ return key;
+}
+
+/* add a single keymap entry, associate with specified master ct */
+int nf_ct_gre_keymap_add(struct nf_conn *ct, enum ip_conntrack_dir dir,
+ struct nf_conntrack_tuple *t)
+{
+ struct nf_conn_help *help = nfct_help(ct);
+ struct nf_ct_gre_keymap **kmp, *km;
+
+ BUG_ON(strcmp(help->helper->name, "pptp"));
+ kmp = &help->help.ct_pptp_info.keymap[dir];
+ if (*kmp) {
+ /* check whether it's a retransmission */
+ list_for_each_entry(km, &gre_keymap_list, list) {
+ if (gre_key_cmpfn(km, t) && km == *kmp)
+ return 0;
+ }
+ DEBUGP("trying to override keymap_%s for ct %p\n",
+ dir == IP_CT_DIR_REPLY ? "reply" : "orig", ct);
+ return -EEXIST;
+ }
+
+ km = kmalloc(sizeof(*km), GFP_ATOMIC);
+ if (!km)
+ return -ENOMEM;
+ memcpy(&km->tuple, t, sizeof(*t));
+ *kmp = km;
+
+ DEBUGP("adding new entry %p: ", km);
+ NF_CT_DUMP_TUPLE(&km->tuple);
+
+ write_lock_bh(&nf_ct_gre_lock);
+ list_add_tail(&km->list, &gre_keymap_list);
+ write_unlock_bh(&nf_ct_gre_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nf_ct_gre_keymap_add);
+
+/* destroy the keymap entries associated with specified master ct */
+void nf_ct_gre_keymap_destroy(struct nf_conn *ct)
+{
+ struct nf_conn_help *help = nfct_help(ct);
+ enum ip_conntrack_dir dir;
+
+ DEBUGP("entering for ct %p\n", ct);
+ BUG_ON(strcmp(help->helper->name, "pptp"));
+
+ write_lock_bh(&nf_ct_gre_lock);
+ for (dir = IP_CT_DIR_ORIGINAL; dir < IP_CT_DIR_MAX; dir++) {
+ if (help->help.ct_pptp_info.keymap[dir]) {
+ DEBUGP("removing %p from list\n",
+ help->help.ct_pptp_info.keymap[dir]);
+ list_del(&help->help.ct_pptp_info.keymap[dir]->list);
+ kfree(help->help.ct_pptp_info.keymap[dir]);
+ help->help.ct_pptp_info.keymap[dir] = NULL;
+ }
+ }
+ write_unlock_bh(&nf_ct_gre_lock);
+}
+EXPORT_SYMBOL_GPL(nf_ct_gre_keymap_destroy);
+
+/* PUBLIC CONNTRACK PROTO HELPER FUNCTIONS */
+
+/* invert gre part of tuple */
+static int gre_invert_tuple(struct nf_conntrack_tuple *tuple,
+ const struct nf_conntrack_tuple *orig)
+{
+ tuple->dst.u.gre.key = orig->src.u.gre.key;
+ tuple->src.u.gre.key = orig->dst.u.gre.key;
+ return 1;
+}
+
+/* gre hdr info to tuple */
+static int gre_pkt_to_tuple(const struct sk_buff *skb,
+ unsigned int dataoff,
+ struct nf_conntrack_tuple *tuple)
+{
+ struct gre_hdr_pptp _pgrehdr, *pgrehdr;
+ __be16 srckey;
+ struct gre_hdr _grehdr, *grehdr;
+
+ /* first only delinearize old RFC1701 GRE header */
+ grehdr = skb_header_pointer(skb, dataoff, sizeof(_grehdr), &_grehdr);
+ if (!grehdr || grehdr->version != GRE_VERSION_PPTP) {
+ /* try to behave like "nf_conntrack_proto_generic" */
+ tuple->src.u.all = 0;
+ tuple->dst.u.all = 0;
+ return 1;
+ }
+
+ /* PPTP header is variable length, only need up to the call_id field */
+ pgrehdr = skb_header_pointer(skb, dataoff, 8, &_pgrehdr);
+ if (!pgrehdr)
+ return 1;
+
+ if (ntohs(grehdr->protocol) != GRE_PROTOCOL_PPTP) {
+ DEBUGP("GRE_VERSION_PPTP but unknown proto\n");
+ return 0;
+ }
+
+ tuple->dst.u.gre.key = pgrehdr->call_id;
+ srckey = gre_keymap_lookup(tuple);
+ tuple->src.u.gre.key = srckey;
+
+ return 1;
+}
+
+/* print gre part of tuple */
+static int gre_print_tuple(struct seq_file *s,
+ const struct nf_conntrack_tuple *tuple)
+{
+ return seq_printf(s, "srckey=0x%x dstkey=0x%x ",
+ ntohs(tuple->src.u.gre.key),
+ ntohs(tuple->dst.u.gre.key));
+}
+
+/* print private data for conntrack */
+static int gre_print_conntrack(struct seq_file *s,
+ const struct nf_conn *ct)
+{
+ return seq_printf(s, "timeout=%u, stream_timeout=%u ",
+ (ct->proto.gre.timeout / HZ),
+ (ct->proto.gre.stream_timeout / HZ));
+}
+
+/* Returns verdict for packet, and may modify conntrack */
+static int gre_packet(struct nf_conn *ct,
+ const struct sk_buff *skb,
+ unsigned int dataoff,
+ enum ip_conntrack_info ctinfo,
+ int pf,
+ unsigned int hooknum)
+{
+ /* If we've seen traffic both ways, this is a GRE connection.
+ * Extend timeout. */
+ if (ct->status & IPS_SEEN_REPLY) {
+ nf_ct_refresh_acct(ct, ctinfo, skb,
+ ct->proto.gre.stream_timeout);
+ /* Also, more likely to be important, and not a probe. */
+ set_bit(IPS_ASSURED_BIT, &ct->status);
+ nf_conntrack_event_cache(IPCT_STATUS, skb);
+ } else
+ nf_ct_refresh_acct(ct, ctinfo, skb,
+ ct->proto.gre.timeout);
+
+ return NF_ACCEPT;
+}
+
+/* Called when a new connection for this protocol found. */
+static int gre_new(struct nf_conn *ct, const struct sk_buff *skb,
+ unsigned int dataoff)
+{
+ DEBUGP(": ");
+ NF_CT_DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+
+ /* initialize to sane value. Ideally a conntrack helper
+ * (e.g. in case of pptp) is increasing them */
+ ct->proto.gre.stream_timeout = GRE_STREAM_TIMEOUT;
+ ct->proto.gre.timeout = GRE_TIMEOUT;
+
+ return 1;
+}
+
+/* Called when a conntrack entry has already been removed from the hashes
+ * and is about to be deleted from memory */
+static void gre_destroy(struct nf_conn *ct)
+{
+ struct nf_conn *master = ct->master;
+ DEBUGP(" entering\n");
+
+ if (!master)
+ DEBUGP("no master !?!\n");
+ else
+ nf_ct_gre_keymap_destroy(master);
+}
+
+/* protocol helper struct */
+static struct nf_conntrack_l4proto nf_conntrack_l4proto_gre4 = {
+ .l3proto = AF_INET,
+ .l4proto = IPPROTO_GRE,
+ .name = "gre",
+ .pkt_to_tuple = gre_pkt_to_tuple,
+ .invert_tuple = gre_invert_tuple,
+ .print_tuple = gre_print_tuple,
+ .print_conntrack = gre_print_conntrack,
+ .packet = gre_packet,
+ .new = gre_new,
+ .destroy = gre_destroy,
+ .me = THIS_MODULE,
+#if defined(CONFIG_NF_CONNTRACK_NETLINK) || \
+ defined(CONFIG_NF_CONNTRACK_NETLINK_MODULE)
+ .tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
+ .nfattr_to_tuple = nf_ct_port_nfattr_to_tuple,
+#endif
+};
+
+static int __init nf_ct_proto_gre_init(void)
+{
+ return nf_conntrack_l4proto_register(&nf_conntrack_l4proto_gre4);
+}
+
+static void nf_ct_proto_gre_fini(void)
+{
+ nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_gre4);
+ nf_ct_gre_keymap_flush();
+}
+
+module_init(nf_ct_proto_gre_init);
+module_exit(nf_ct_proto_gre_fini);
+
+MODULE_LICENSE("GPL");
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 16/20]: nf_conntrack/nf_nat: add SIP helper port
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (13 preceding siblings ...)
2006-12-02 14:50 ` [NETFILTER 15/20]: nf_conntrack/nf_nat: add PPTP " Patrick McHardy
@ 2006-12-02 14:50 ` Patrick McHardy
2006-12-02 14:50 ` [NETFILTER 17/20]: nf_conntrack/nf_nat: add TFTP " Patrick McHardy
` (5 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:50 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack/nf_nat: add SIP helper port
Add IPv4 and IPv6 capable nf_conntrack port of the SIP conntrack/NAT helper.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit b83f09c4c816919e00f9f78ffe12dc4bf81aa2c4
tree 9aeb3063a8f20917aea3c0c1962f8eccd07a393c
parent d076bee62093db6576c9c2950be703fc1b74be64
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:21 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:21 +0100
include/linux/netfilter/nf_conntrack_sip.h | 41 ++
net/ipv4/netfilter/Kconfig | 5
net/ipv4/netfilter/Makefile | 1
net/ipv4/netfilter/nf_nat_sip.c | 283 +++++++++++++++
net/netfilter/Kconfig | 12 +
net/netfilter/Makefile | 1
net/netfilter/nf_conntrack_sip.c | 530 ++++++++++++++++++++++++++++
7 files changed, 873 insertions(+), 0 deletions(-)
diff --git a/include/linux/netfilter/nf_conntrack_sip.h b/include/linux/netfilter/nf_conntrack_sip.h
new file mode 100644
index 0000000..bb7f204
--- /dev/null
+++ b/include/linux/netfilter/nf_conntrack_sip.h
@@ -0,0 +1,41 @@
+#ifndef __NF_CONNTRACK_SIP_H__
+#define __NF_CONNTRACK_SIP_H__
+#ifdef __KERNEL__
+
+#define SIP_PORT 5060
+#define SIP_TIMEOUT 3600
+
+enum sip_header_pos {
+ POS_REG_REQ_URI,
+ POS_REQ_URI,
+ POS_FROM,
+ POS_TO,
+ POS_VIA,
+ POS_CONTACT,
+ POS_CONTENT,
+ POS_MEDIA,
+ POS_OWNER_IP4,
+ POS_CONNECTION_IP4,
+ POS_OWNER_IP6,
+ POS_CONNECTION_IP6,
+ POS_SDP_HEADER,
+};
+
+extern unsigned int (*nf_nat_sip_hook)(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ struct nf_conn *ct,
+ const char **dptr);
+extern unsigned int (*nf_nat_sdp_hook)(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ struct nf_conntrack_expect *exp,
+ const char *dptr);
+
+extern int ct_sip_get_info(struct nf_conn *ct, const char *dptr, size_t dlen,
+ unsigned int *matchoff, unsigned int *matchlen,
+ enum sip_header_pos pos);
+extern int ct_sip_lnlen(const char *line, const char *limit);
+extern const char *ct_sip_search(const char *needle, const char *haystack,
+ size_t needle_len, size_t haystack_len,
+ int case_sensitive);
+#endif /* __KERNEL__ */
+#endif /* __NF_CONNTRACK_SIP_H__ */
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index c3327ac..83e83f5 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -555,6 +555,11 @@ config IP_NF_NAT_SIP
default IP_NF_NAT if IP_NF_SIP=y
default m if IP_NF_SIP=m
+config NF_NAT_SIP
+ tristate
+ depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
+ default NF_NAT && NF_CONNTRACK_SIP
+
# mangle + specific targets
config IP_NF_MANGLE
tristate "Packet mangling"
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index ef33ff2..167b65e 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o
+obj-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
# NAT protocols (nf_nat)
obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o
diff --git a/net/ipv4/netfilter/nf_nat_sip.c b/net/ipv4/netfilter/nf_nat_sip.c
new file mode 100644
index 0000000..3d524b9
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_sip.c
@@ -0,0 +1,283 @@
+/* SIP extension for UDP NAT alteration.
+ *
+ * (C) 2005 by Christian Hentschel <chentschel@arnet.com.ar>
+ * based on RR's ip_nat_ftp.c and other modules.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_helper.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <linux/netfilter/nf_conntrack_sip.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Hentschel <chentschel@arnet.com.ar>");
+MODULE_DESCRIPTION("SIP NAT helper");
+MODULE_ALIAS("ip_nat_sip");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+struct addr_map {
+ struct {
+ char src[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
+ char dst[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
+ unsigned int srclen, srciplen;
+ unsigned int dstlen, dstiplen;
+ } addr[IP_CT_DIR_MAX];
+};
+
+static void addr_map_init(struct nf_conn *ct, struct addr_map *map)
+{
+ struct nf_conntrack_tuple *t;
+ enum ip_conntrack_dir dir;
+ unsigned int n;
+
+ for (dir = 0; dir < IP_CT_DIR_MAX; dir++) {
+ t = &ct->tuplehash[dir].tuple;
+
+ n = sprintf(map->addr[dir].src, "%u.%u.%u.%u",
+ NIPQUAD(t->src.u3.ip));
+ map->addr[dir].srciplen = n;
+ n += sprintf(map->addr[dir].src + n, ":%u",
+ ntohs(t->src.u.udp.port));
+ map->addr[dir].srclen = n;
+
+ n = sprintf(map->addr[dir].dst, "%u.%u.%u.%u",
+ NIPQUAD(t->dst.u3.ip));
+ map->addr[dir].dstiplen = n;
+ n += sprintf(map->addr[dir].dst + n, ":%u",
+ ntohs(t->dst.u.udp.port));
+ map->addr[dir].dstlen = n;
+ }
+}
+
+static int map_sip_addr(struct sk_buff **pskb, enum ip_conntrack_info ctinfo,
+ struct nf_conn *ct, const char **dptr, size_t dlen,
+ enum sip_header_pos pos, struct addr_map *map)
+{
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+ unsigned int matchlen, matchoff, addrlen;
+ char *addr;
+
+ if (ct_sip_get_info(ct, *dptr, dlen, &matchoff, &matchlen, pos) <= 0)
+ return 1;
+
+ if ((matchlen == map->addr[dir].srciplen ||
+ matchlen == map->addr[dir].srclen) &&
+ memcmp(*dptr + matchoff, map->addr[dir].src, matchlen) == 0) {
+ addr = map->addr[!dir].dst;
+ addrlen = map->addr[!dir].dstlen;
+ } else if ((matchlen == map->addr[dir].dstiplen ||
+ matchlen == map->addr[dir].dstlen) &&
+ memcmp(*dptr + matchoff, map->addr[dir].dst, matchlen) == 0) {
+ addr = map->addr[!dir].src;
+ addrlen = map->addr[!dir].srclen;
+ } else
+ return 1;
+
+ if (!nf_nat_mangle_udp_packet(pskb, ct, ctinfo,
+ matchoff, matchlen, addr, addrlen))
+ return 0;
+ *dptr = (*pskb)->data + (*pskb)->nh.iph->ihl*4 + sizeof(struct udphdr);
+ return 1;
+
+}
+
+static unsigned int ip_nat_sip(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ struct nf_conn *ct,
+ const char **dptr)
+{
+ enum sip_header_pos pos;
+ struct addr_map map;
+ int dataoff, datalen;
+
+ dataoff = (*pskb)->nh.iph->ihl*4 + sizeof(struct udphdr);
+ datalen = (*pskb)->len - dataoff;
+ if (datalen < sizeof("SIP/2.0") - 1)
+ return NF_DROP;
+
+ addr_map_init(ct, &map);
+
+ /* Basic rules: requests and responses. */
+ if (strncmp(*dptr, "SIP/2.0", sizeof("SIP/2.0") - 1) != 0) {
+ /* 10.2: Constructing the REGISTER Request:
+ *
+ * The "userinfo" and "@" components of the SIP URI MUST NOT
+ * be present.
+ */
+ if (datalen >= sizeof("REGISTER") - 1 &&
+ strncmp(*dptr, "REGISTER", sizeof("REGISTER") - 1) == 0)
+ pos = POS_REG_REQ_URI;
+ else
+ pos = POS_REQ_URI;
+
+ if (!map_sip_addr(pskb, ctinfo, ct, dptr, datalen, pos, &map))
+ return NF_DROP;
+ }
+
+ if (!map_sip_addr(pskb, ctinfo, ct, dptr, datalen, POS_FROM, &map) ||
+ !map_sip_addr(pskb, ctinfo, ct, dptr, datalen, POS_TO, &map) ||
+ !map_sip_addr(pskb, ctinfo, ct, dptr, datalen, POS_VIA, &map) ||
+ !map_sip_addr(pskb, ctinfo, ct, dptr, datalen, POS_CONTACT, &map))
+ return NF_DROP;
+ return NF_ACCEPT;
+}
+
+static unsigned int mangle_sip_packet(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ struct nf_conn *ct,
+ const char **dptr, size_t dlen,
+ char *buffer, int bufflen,
+ enum sip_header_pos pos)
+{
+ unsigned int matchlen, matchoff;
+
+ if (ct_sip_get_info(ct, *dptr, dlen, &matchoff, &matchlen, pos) <= 0)
+ return 0;
+
+ if (!nf_nat_mangle_udp_packet(pskb, ct, ctinfo,
+ matchoff, matchlen, buffer, bufflen))
+ return 0;
+
+ /* We need to reload this. Thanks Patrick. */
+ *dptr = (*pskb)->data + (*pskb)->nh.iph->ihl*4 + sizeof(struct udphdr);
+ return 1;
+}
+
+static int mangle_content_len(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ struct nf_conn *ct,
+ const char *dptr)
+{
+ unsigned int dataoff, matchoff, matchlen;
+ char buffer[sizeof("65536")];
+ int bufflen;
+
+ dataoff = (*pskb)->nh.iph->ihl*4 + sizeof(struct udphdr);
+
+ /* Get actual SDP lenght */
+ if (ct_sip_get_info(ct, dptr, (*pskb)->len - dataoff, &matchoff,
+ &matchlen, POS_SDP_HEADER) > 0) {
+
+ /* since ct_sip_get_info() give us a pointer passing 'v='
+ we need to add 2 bytes in this count. */
+ int c_len = (*pskb)->len - dataoff - matchoff + 2;
+
+ /* Now, update SDP length */
+ if (ct_sip_get_info(ct, dptr, (*pskb)->len - dataoff, &matchoff,
+ &matchlen, POS_CONTENT) > 0) {
+
+ bufflen = sprintf(buffer, "%u", c_len);
+ return nf_nat_mangle_udp_packet(pskb, ct, ctinfo,
+ matchoff, matchlen,
+ buffer, bufflen);
+ }
+ }
+ return 0;
+}
+
+static unsigned int mangle_sdp(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ struct nf_conn *ct,
+ __be32 newip, u_int16_t port,
+ const char *dptr)
+{
+ char buffer[sizeof("nnn.nnn.nnn.nnn")];
+ unsigned int dataoff, bufflen;
+
+ dataoff = (*pskb)->nh.iph->ihl*4 + sizeof(struct udphdr);
+
+ /* Mangle owner and contact info. */
+ bufflen = sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(newip));
+ if (!mangle_sip_packet(pskb, ctinfo, ct, &dptr, (*pskb)->len - dataoff,
+ buffer, bufflen, POS_OWNER_IP4))
+ return 0;
+
+ if (!mangle_sip_packet(pskb, ctinfo, ct, &dptr, (*pskb)->len - dataoff,
+ buffer, bufflen, POS_CONNECTION_IP4))
+ return 0;
+
+ /* Mangle media port. */
+ bufflen = sprintf(buffer, "%u", port);
+ if (!mangle_sip_packet(pskb, ctinfo, ct, &dptr, (*pskb)->len - dataoff,
+ buffer, bufflen, POS_MEDIA))
+ return 0;
+
+ return mangle_content_len(pskb, ctinfo, ct, dptr);
+}
+
+/* So, this packet has hit the connection tracking matching code.
+ Mangle it, and change the expectation to match the new version. */
+static unsigned int ip_nat_sdp(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ struct nf_conntrack_expect *exp,
+ const char *dptr)
+{
+ struct nf_conn *ct = exp->master;
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+ __be32 newip;
+ u_int16_t port;
+
+ DEBUGP("ip_nat_sdp():\n");
+
+ /* Connection will come from reply */
+ newip = ct->tuplehash[!dir].tuple.dst.u3.ip;
+
+ exp->tuple.dst.u3.ip = newip;
+ exp->saved_proto.udp.port = exp->tuple.dst.u.udp.port;
+ exp->dir = !dir;
+
+ /* When you see the packet, we need to NAT it the same as the
+ this one. */
+ exp->expectfn = nf_nat_follow_master;
+
+ /* Try to get same port: if not, try to change it. */
+ for (port = ntohs(exp->saved_proto.udp.port); port != 0; port++) {
+ exp->tuple.dst.u.udp.port = htons(port);
+ if (nf_conntrack_expect_related(exp) == 0)
+ break;
+ }
+
+ if (port == 0)
+ return NF_DROP;
+
+ if (!mangle_sdp(pskb, ctinfo, ct, newip, port, dptr)) {
+ nf_conntrack_unexpect_related(exp);
+ return NF_DROP;
+ }
+ return NF_ACCEPT;
+}
+
+static void __exit nf_nat_sip_fini(void)
+{
+ rcu_assign_pointer(nf_nat_sip_hook, NULL);
+ rcu_assign_pointer(nf_nat_sdp_hook, NULL);
+ synchronize_rcu();
+}
+
+static int __init nf_nat_sip_init(void)
+{
+ BUG_ON(rcu_dereference(nf_nat_sip_hook));
+ BUG_ON(rcu_dereference(nf_nat_sdp_hook));
+ rcu_assign_pointer(nf_nat_sip_hook, ip_nat_sip);
+ rcu_assign_pointer(nf_nat_sdp_hook, ip_nat_sdp);
+ return 0;
+}
+
+module_init(nf_nat_sip_init);
+module_exit(nf_nat_sip_fini);
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 6b2eb26..e738911 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -236,6 +236,18 @@ config NF_CONNTRACK_PPTP
To compile it as a module, choose M here. If unsure, say N.
+config NF_CONNTRACK_SIP
+ tristate "SIP protocol support (EXPERIMENTAL)"
+ depends on EXPERIMENTAL && NF_CONNTRACK
+ help
+ SIP is an application-layer control protocol that can establish,
+ modify, and terminate multimedia sessions (conferences) such as
+ Internet telephony calls. With the ip_conntrack_sip and
+ the nf_nat_sip modules you can support the protocol on a connection
+ tracking/NATing firewall.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config NF_CT_NETLINK
tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 897bed4..86da217 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_NF_CONNTRACK_H323) += nf_co
obj-$(CONFIG_NF_CONNTRACK_IRC) += nf_conntrack_irc.o
obj-$(CONFIG_NF_CONNTRACK_NETBIOS_NS) += nf_conntrack_netbios_ns.o
obj-$(CONFIG_NF_CONNTRACK_PPTP) += nf_conntrack_pptp.o
+obj-$(CONFIG_NF_CONNTRACK_SIP) += nf_conntrack_sip.o
# generic X tables
obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
new file mode 100644
index 0000000..e0c0679
--- /dev/null
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -0,0 +1,530 @@
+/* SIP extension for IP connection tracking.
+ *
+ * (C) 2005 by Christian Hentschel <chentschel@arnet.com.ar>
+ * based on RR's ip_conntrack_ftp.c and other modules.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/skbuff.h>
+#include <linux/inet.h>
+#include <linux/in.h>
+#include <linux/udp.h>
+
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <linux/netfilter/nf_conntrack_sip.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Hentschel <chentschel@arnet.com.ar>");
+MODULE_DESCRIPTION("SIP connection tracking helper");
+MODULE_ALIAS("ip_conntrack_sip");
+
+#define MAX_PORTS 8
+static unsigned short ports[MAX_PORTS];
+static int ports_c;
+module_param_array(ports, ushort, &ports_c, 0400);
+MODULE_PARM_DESC(ports, "port numbers of SIP servers");
+
+static unsigned int sip_timeout __read_mostly = SIP_TIMEOUT;
+module_param(sip_timeout, uint, 0600);
+MODULE_PARM_DESC(sip_timeout, "timeout for the master SIP session");
+
+unsigned int (*nf_nat_sip_hook)(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ struct nf_conn *ct,
+ const char **dptr) __read_mostly;
+EXPORT_SYMBOL_GPL(nf_nat_sip_hook);
+
+unsigned int (*nf_nat_sdp_hook)(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ struct nf_conntrack_expect *exp,
+ const char *dptr) __read_mostly;
+EXPORT_SYMBOL_GPL(nf_nat_sdp_hook);
+
+static int digits_len(struct nf_conn *, const char *, const char *, int *);
+static int epaddr_len(struct nf_conn *, const char *, const char *, int *);
+static int skp_digits_len(struct nf_conn *, const char *, const char *, int *);
+static int skp_epaddr_len(struct nf_conn *, const char *, const char *, int *);
+
+struct sip_header_nfo {
+ const char *lname;
+ const char *sname;
+ const char *ln_str;
+ size_t lnlen;
+ size_t snlen;
+ size_t ln_strlen;
+ int case_sensitive;
+ int (*match_len)(struct nf_conn *, const char *,
+ const char *, int *);
+};
+
+static const struct sip_header_nfo ct_sip_hdrs[] = {
+ [POS_REG_REQ_URI] = { /* SIP REGISTER request URI */
+ .lname = "sip:",
+ .lnlen = sizeof("sip:") - 1,
+ .ln_str = ":",
+ .ln_strlen = sizeof(":") - 1,
+ .match_len = epaddr_len,
+ },
+ [POS_REQ_URI] = { /* SIP request URI */
+ .lname = "sip:",
+ .lnlen = sizeof("sip:") - 1,
+ .ln_str = "@",
+ .ln_strlen = sizeof("@") - 1,
+ .match_len = epaddr_len,
+ },
+ [POS_FROM] = { /* SIP From header */
+ .lname = "From:",
+ .lnlen = sizeof("From:") - 1,
+ .sname = "\r\nf:",
+ .snlen = sizeof("\r\nf:") - 1,
+ .ln_str = "sip:",
+ .ln_strlen = sizeof("sip:") - 1,
+ .match_len = skp_epaddr_len,
+ },
+ [POS_TO] = { /* SIP To header */
+ .lname = "To:",
+ .lnlen = sizeof("To:") - 1,
+ .sname = "\r\nt:",
+ .snlen = sizeof("\r\nt:") - 1,
+ .ln_str = "sip:",
+ .ln_strlen = sizeof("sip:") - 1,
+ .match_len = skp_epaddr_len
+ },
+ [POS_VIA] = { /* SIP Via header */
+ .lname = "Via:",
+ .lnlen = sizeof("Via:") - 1,
+ .sname = "\r\nv:",
+ .snlen = sizeof("\r\nv:") - 1, /* rfc3261 "\r\n" */
+ .ln_str = "UDP ",
+ .ln_strlen = sizeof("UDP ") - 1,
+ .match_len = epaddr_len,
+ },
+ [POS_CONTACT] = { /* SIP Contact header */
+ .lname = "Contact:",
+ .lnlen = sizeof("Contact:") - 1,
+ .sname = "\r\nm:",
+ .snlen = sizeof("\r\nm:") - 1,
+ .ln_str = "sip:",
+ .ln_strlen = sizeof("sip:") - 1,
+ .match_len = skp_epaddr_len
+ },
+ [POS_CONTENT] = { /* SIP Content length header */
+ .lname = "Content-Length:",
+ .lnlen = sizeof("Content-Length:") - 1,
+ .sname = "\r\nl:",
+ .snlen = sizeof("\r\nl:") - 1,
+ .ln_str = ":",
+ .ln_strlen = sizeof(":") - 1,
+ .match_len = skp_digits_len
+ },
+ [POS_MEDIA] = { /* SDP media info */
+ .case_sensitive = 1,
+ .lname = "\nm=",
+ .lnlen = sizeof("\nm=") - 1,
+ .sname = "\rm=",
+ .snlen = sizeof("\rm=") - 1,
+ .ln_str = "audio ",
+ .ln_strlen = sizeof("audio ") - 1,
+ .match_len = digits_len
+ },
+ [POS_OWNER_IP4] = { /* SDP owner address*/
+ .case_sensitive = 1,
+ .lname = "\no=",
+ .lnlen = sizeof("\no=") - 1,
+ .sname = "\ro=",
+ .snlen = sizeof("\ro=") - 1,
+ .ln_str = "IN IP4 ",
+ .ln_strlen = sizeof("IN IP4 ") - 1,
+ .match_len = epaddr_len
+ },
+ [POS_CONNECTION_IP4] = {/* SDP connection info */
+ .case_sensitive = 1,
+ .lname = "\nc=",
+ .lnlen = sizeof("\nc=") - 1,
+ .sname = "\rc=",
+ .snlen = sizeof("\rc=") - 1,
+ .ln_str = "IN IP4 ",
+ .ln_strlen = sizeof("IN IP4 ") - 1,
+ .match_len = epaddr_len
+ },
+ [POS_OWNER_IP6] = { /* SDP owner address*/
+ .case_sensitive = 1,
+ .lname = "\no=",
+ .lnlen = sizeof("\no=") - 1,
+ .sname = "\ro=",
+ .snlen = sizeof("\ro=") - 1,
+ .ln_str = "IN IP6 ",
+ .ln_strlen = sizeof("IN IP6 ") - 1,
+ .match_len = epaddr_len
+ },
+ [POS_CONNECTION_IP6] = {/* SDP connection info */
+ .case_sensitive = 1,
+ .lname = "\nc=",
+ .lnlen = sizeof("\nc=") - 1,
+ .sname = "\rc=",
+ .snlen = sizeof("\rc=") - 1,
+ .ln_str = "IN IP6 ",
+ .ln_strlen = sizeof("IN IP6 ") - 1,
+ .match_len = epaddr_len
+ },
+ [POS_SDP_HEADER] = { /* SDP version header */
+ .case_sensitive = 1,
+ .lname = "\nv=",
+ .lnlen = sizeof("\nv=") - 1,
+ .sname = "\rv=",
+ .snlen = sizeof("\rv=") - 1,
+ .ln_str = "=",
+ .ln_strlen = sizeof("=") - 1,
+ .match_len = digits_len
+ }
+};
+
+/* get line lenght until first CR or LF seen. */
+int ct_sip_lnlen(const char *line, const char *limit)
+{
+ const char *k = line;
+
+ while ((line <= limit) && (*line == '\r' || *line == '\n'))
+ line++;
+
+ while (line <= limit) {
+ if (*line == '\r' || *line == '\n')
+ break;
+ line++;
+ }
+ return line - k;
+}
+EXPORT_SYMBOL_GPL(ct_sip_lnlen);
+
+/* Linear string search, case sensitive. */
+const char *ct_sip_search(const char *needle, const char *haystack,
+ size_t needle_len, size_t haystack_len,
+ int case_sensitive)
+{
+ const char *limit = haystack + (haystack_len - needle_len);
+
+ while (haystack <= limit) {
+ if (case_sensitive) {
+ if (strncmp(haystack, needle, needle_len) == 0)
+ return haystack;
+ } else {
+ if (strnicmp(haystack, needle, needle_len) == 0)
+ return haystack;
+ }
+ haystack++;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(ct_sip_search);
+
+static int digits_len(struct nf_conn *ct, const char *dptr,
+ const char *limit, int *shift)
+{
+ int len = 0;
+ while (dptr <= limit && isdigit(*dptr)) {
+ dptr++;
+ len++;
+ }
+ return len;
+}
+
+/* get digits lenght, skiping blank spaces. */
+static int skp_digits_len(struct nf_conn *ct, const char *dptr,
+ const char *limit, int *shift)
+{
+ for (; dptr <= limit && *dptr == ' '; dptr++)
+ (*shift)++;
+
+ return digits_len(ct, dptr, limit, shift);
+}
+
+static int parse_addr(struct nf_conn *ct, const char *cp, const char **endp,
+ union nf_conntrack_address *addr, const char *limit)
+{
+ const char *end;
+ int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
+ int ret = 0;
+
+ switch (family) {
+ case AF_INET:
+ ret = in4_pton(cp, limit - cp, (u8 *)&addr->ip, -1, &end);
+ break;
+ case AF_INET6:
+ ret = in6_pton(cp, limit - cp, (u8 *)&addr->ip6, -1, &end);
+ break;
+ default:
+ BUG();
+ }
+
+ if (ret == 0 || end == cp)
+ return 0;
+ if (endp)
+ *endp = end;
+ return 1;
+}
+
+/* skip ip address. returns its length. */
+static int epaddr_len(struct nf_conn *ct, const char *dptr,
+ const char *limit, int *shift)
+{
+ union nf_conntrack_address addr;
+ const char *aux = dptr;
+
+ if (!parse_addr(ct, dptr, &dptr, &addr, limit)) {
+ DEBUGP("ip: %s parse failed.!\n", dptr);
+ return 0;
+ }
+
+ /* Port number */
+ if (*dptr == ':') {
+ dptr++;
+ dptr += digits_len(ct, dptr, limit, shift);
+ }
+ return dptr - aux;
+}
+
+/* get address length, skiping user info. */
+static int skp_epaddr_len(struct nf_conn *ct, const char *dptr,
+ const char *limit, int *shift)
+{
+ int s = *shift;
+
+ for (; dptr <= limit && *dptr != '@'; dptr++)
+ (*shift)++;
+
+ if (*dptr == '@') {
+ dptr++;
+ (*shift)++;
+ } else
+ *shift = s;
+
+ return epaddr_len(ct, dptr, limit, shift);
+}
+
+/* Returns 0 if not found, -1 error parsing. */
+int ct_sip_get_info(struct nf_conn *ct,
+ const char *dptr, size_t dlen,
+ unsigned int *matchoff,
+ unsigned int *matchlen,
+ enum sip_header_pos pos)
+{
+ const struct sip_header_nfo *hnfo = &ct_sip_hdrs[pos];
+ const char *limit, *aux, *k = dptr;
+ int shift = 0;
+
+ limit = dptr + (dlen - hnfo->lnlen);
+
+ while (dptr <= limit) {
+ if ((strncmp(dptr, hnfo->lname, hnfo->lnlen) != 0) &&
+ (strncmp(dptr, hnfo->sname, hnfo->snlen) != 0)) {
+ dptr++;
+ continue;
+ }
+ aux = ct_sip_search(hnfo->ln_str, dptr, hnfo->ln_strlen,
+ ct_sip_lnlen(dptr, limit),
+ hnfo->case_sensitive);
+ if (!aux) {
+ DEBUGP("'%s' not found in '%s'.\n", hnfo->ln_str,
+ hnfo->lname);
+ return -1;
+ }
+ aux += hnfo->ln_strlen;
+
+ *matchlen = hnfo->match_len(ct, aux, limit, &shift);
+ if (!*matchlen)
+ return -1;
+
+ *matchoff = (aux - k) + shift;
+
+ DEBUGP("%s match succeeded! - len: %u\n", hnfo->lname,
+ *matchlen);
+ return 1;
+ }
+ DEBUGP("%s header not found.\n", hnfo->lname);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ct_sip_get_info);
+
+static int set_expected_rtp(struct sk_buff **pskb,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ union nf_conntrack_address *addr,
+ __be16 port,
+ const char *dptr)
+{
+ struct nf_conntrack_expect *exp;
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+ int family = ct->tuplehash[!dir].tuple.src.l3num;
+ int ret;
+ typeof(nf_nat_sdp_hook) nf_nat_sdp;
+
+ exp = nf_conntrack_expect_alloc(ct);
+ if (exp == NULL)
+ return NF_DROP;
+ nf_conntrack_expect_init(exp, family,
+ &ct->tuplehash[!dir].tuple.src.u3, addr,
+ IPPROTO_UDP, NULL, &port);
+
+ nf_nat_sdp = rcu_dereference(nf_nat_sdp_hook);
+ if (nf_nat_sdp && ct->status & IPS_NAT_MASK)
+ ret = nf_nat_sdp(pskb, ctinfo, exp, dptr);
+ else {
+ if (nf_conntrack_expect_related(exp) != 0)
+ ret = NF_DROP;
+ else
+ ret = NF_ACCEPT;
+ }
+ nf_conntrack_expect_put(exp);
+
+ return ret;
+}
+
+static int sip_help(struct sk_buff **pskb,
+ unsigned int protoff,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
+ union nf_conntrack_address addr;
+ unsigned int dataoff, datalen;
+ const char *dptr;
+ int ret = NF_ACCEPT;
+ int matchoff, matchlen;
+ u_int16_t port;
+ enum sip_header_pos pos;
+ typeof(nf_nat_sip_hook) nf_nat_sip;
+
+ /* No Data ? */
+ dataoff = protoff + sizeof(struct udphdr);
+ if (dataoff >= (*pskb)->len)
+ return NF_ACCEPT;
+
+ nf_ct_refresh(ct, *pskb, sip_timeout * HZ);
+
+ if (!skb_is_nonlinear(*pskb))
+ dptr = (*pskb)->data + dataoff;
+ else {
+ DEBUGP("Copy of skbuff not supported yet.\n");
+ goto out;
+ }
+
+ nf_nat_sip = rcu_dereference(nf_nat_sip_hook);
+ if (nf_nat_sip && ct->status & IPS_NAT_MASK) {
+ if (!nf_nat_sip(pskb, ctinfo, ct, &dptr)) {
+ ret = NF_DROP;
+ goto out;
+ }
+ }
+
+ datalen = (*pskb)->len - dataoff;
+ if (datalen < sizeof("SIP/2.0 200") - 1)
+ goto out;
+
+ /* RTP info only in some SDP pkts */
+ if (memcmp(dptr, "INVITE", sizeof("INVITE") - 1) != 0 &&
+ memcmp(dptr, "SIP/2.0 200", sizeof("SIP/2.0 200") - 1) != 0) {
+ goto out;
+ }
+ /* Get address and port from SDP packet. */
+ pos = family == AF_INET ? POS_CONNECTION_IP4 : POS_CONNECTION_IP6;
+ if (ct_sip_get_info(ct, dptr, datalen, &matchoff, &matchlen, pos) > 0) {
+
+ /* We'll drop only if there are parse problems. */
+ if (!parse_addr(ct, dptr + matchoff, NULL, &addr,
+ dptr + datalen)) {
+ ret = NF_DROP;
+ goto out;
+ }
+ if (ct_sip_get_info(ct, dptr, datalen, &matchoff, &matchlen,
+ POS_MEDIA) > 0) {
+
+ port = simple_strtoul(dptr + matchoff, NULL, 10);
+ if (port < 1024) {
+ ret = NF_DROP;
+ goto out;
+ }
+ ret = set_expected_rtp(pskb, ct, ctinfo, &addr,
+ htons(port), dptr);
+ }
+ }
+out:
+ return ret;
+}
+
+static struct nf_conntrack_helper sip[MAX_PORTS][2] __read_mostly;
+static char sip_names[MAX_PORTS][2][sizeof("sip-65535")] __read_mostly;
+
+static void nf_conntrack_sip_fini(void)
+{
+ int i, j;
+
+ for (i = 0; i < ports_c; i++) {
+ for (j = 0; j < 2; j++) {
+ if (sip[i][j].me == NULL)
+ continue;
+ nf_conntrack_helper_unregister(&sip[i][j]);
+ }
+ }
+}
+
+static int __init nf_conntrack_sip_init(void)
+{
+ int i, j, ret;
+ char *tmpname;
+
+ if (ports_c == 0)
+ ports[ports_c++] = SIP_PORT;
+
+ for (i = 0; i < ports_c; i++) {
+ memset(&sip[i], 0, sizeof(sip[i]));
+
+ sip[i][0].tuple.src.l3num = AF_INET;
+ sip[i][1].tuple.src.l3num = AF_INET6;
+ for (j = 0; j < 2; j++) {
+ sip[i][j].tuple.dst.protonum = IPPROTO_UDP;
+ sip[i][j].tuple.src.u.udp.port = htons(ports[i]);
+ sip[i][j].mask.src.l3num = 0xFFFF;
+ sip[i][j].mask.src.u.udp.port = htons(0xFFFF);
+ sip[i][j].mask.dst.protonum = 0xFF;
+ sip[i][j].max_expected = 2;
+ sip[i][j].timeout = 3 * 60; /* 3 minutes */
+ sip[i][j].me = THIS_MODULE;
+ sip[i][j].help = sip_help;
+
+ tmpname = &sip_names[i][j][0];
+ if (ports[i] == SIP_PORT)
+ sprintf(tmpname, "sip");
+ else
+ sprintf(tmpname, "sip-%u", i);
+ sip[i][j].name = tmpname;
+
+ DEBUGP("port #%u: %u\n", i, ports[i]);
+
+ ret = nf_conntrack_helper_register(&sip[i][j]);
+ if (ret) {
+ printk("nf_ct_sip: failed to register helper "
+ "for pf: %u port: %u\n",
+ sip[i][j].tuple.src.l3num, ports[i]);
+ nf_conntrack_sip_fini();
+ return ret;
+ }
+ }
+ }
+ return 0;
+}
+
+module_init(nf_conntrack_sip_init);
+module_exit(nf_conntrack_sip_fini);
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 17/20]: nf_conntrack/nf_nat: add TFTP helper port
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (14 preceding siblings ...)
2006-12-02 14:50 ` [NETFILTER 16/20]: nf_conntrack/nf_nat: add SIP " Patrick McHardy
@ 2006-12-02 14:50 ` Patrick McHardy
2006-12-02 14:50 ` [NETFILTER 18/20]: nf_nat: add SNMP NAT " Patrick McHardy
` (4 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:50 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack/nf_nat: add TFTP helper port
Add IPv4 and IPv6 capable nf_conntrack port of the TFTP conntrack/NAT helper.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit e95138a41a63f7da0d8969c6a00f6f632b912b28
tree 90fa078d527fdca0c67d40f1de0243c8016c2e4b
parent b83f09c4c816919e00f9f78ffe12dc4bf81aa2c4
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:23 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:23 +0100
include/linux/netfilter/nf_conntrack_tftp.h | 20 +++
net/ipv4/netfilter/Kconfig | 5 +
net/ipv4/netfilter/Makefile | 1
net/ipv4/netfilter/nf_nat_tftp.c | 52 +++++++++
net/netfilter/Kconfig | 11 ++
net/netfilter/Makefile | 1
net/netfilter/nf_conntrack_tftp.c | 159 +++++++++++++++++++++++++++
7 files changed, 249 insertions(+), 0 deletions(-)
diff --git a/include/linux/netfilter/nf_conntrack_tftp.h b/include/linux/netfilter/nf_conntrack_tftp.h
new file mode 100644
index 0000000..0d79b7a
--- /dev/null
+++ b/include/linux/netfilter/nf_conntrack_tftp.h
@@ -0,0 +1,20 @@
+#ifndef _NF_CONNTRACK_TFTP_H
+#define _NF_CONNTRACK_TFTP_H
+
+#define TFTP_PORT 69
+
+struct tftphdr {
+ __be16 opcode;
+};
+
+#define TFTP_OPCODE_READ 1
+#define TFTP_OPCODE_WRITE 2
+#define TFTP_OPCODE_DATA 3
+#define TFTP_OPCODE_ACK 4
+#define TFTP_OPCODE_ERROR 5
+
+extern unsigned int (*nf_nat_tftp_hook)(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ struct nf_conntrack_expect *exp);
+
+#endif /* _NF_CONNTRACK_TFTP_H */
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 83e83f5..1c0018b 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -515,6 +515,11 @@ config IP_NF_NAT_TFTP
default IP_NF_NAT if IP_NF_TFTP=y
default m if IP_NF_TFTP=m
+config NF_NAT_TFTP
+ tristate
+ depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
+ default NF_NAT && NF_CONNTRACK_TFTP
+
config IP_NF_NAT_AMANDA
tristate
depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 167b65e..3ca0af0 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323
obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o
obj-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
+obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o
# NAT protocols (nf_nat)
obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o
diff --git a/net/ipv4/netfilter/nf_nat_tftp.c b/net/ipv4/netfilter/nf_nat_tftp.c
new file mode 100644
index 0000000..2566b79
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_tftp.c
@@ -0,0 +1,52 @@
+/* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/udp.h>
+
+#include <net/netfilter/nf_nat_helper.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <linux/netfilter/nf_conntrack_tftp.h>
+
+MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
+MODULE_DESCRIPTION("TFTP NAT helper");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ip_nat_tftp");
+
+static unsigned int help(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ struct nf_conntrack_expect *exp)
+{
+ struct nf_conn *ct = exp->master;
+
+ exp->saved_proto.udp.port
+ = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port;
+ exp->dir = IP_CT_DIR_REPLY;
+ exp->expectfn = nf_nat_follow_master;
+ if (nf_conntrack_expect_related(exp) != 0)
+ return NF_DROP;
+ return NF_ACCEPT;
+}
+
+static void __exit nf_nat_tftp_fini(void)
+{
+ rcu_assign_pointer(nf_nat_tftp_hook, NULL);
+ synchronize_rcu();
+}
+
+static int __init nf_nat_tftp_init(void)
+{
+ BUG_ON(rcu_dereference(nf_nat_tftp_hook));
+ rcu_assign_pointer(nf_nat_tftp_hook, help);
+ return 0;
+}
+
+module_init(nf_nat_tftp_init);
+module_exit(nf_nat_tftp_fini);
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index e738911..e0deac1 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -248,6 +248,17 @@ config NF_CONNTRACK_SIP
To compile it as a module, choose M here. If unsure, say N.
+config NF_CONNTRACK_TFTP
+ tristate "TFTP protocol support (EXPERIMENTAL)"
+ depends on EXPERIMENTAL && NF_CONNTRACK
+ help
+ TFTP connection tracking helper, this is required depending
+ on how restrictive your ruleset is.
+ If you are using a tftp client behind -j SNAT or -j MASQUERADING
+ you will need this.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config NF_CT_NETLINK
tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 86da217..5dc5574 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_NF_CONNTRACK_IRC) += nf_con
obj-$(CONFIG_NF_CONNTRACK_NETBIOS_NS) += nf_conntrack_netbios_ns.o
obj-$(CONFIG_NF_CONNTRACK_PPTP) += nf_conntrack_pptp.o
obj-$(CONFIG_NF_CONNTRACK_SIP) += nf_conntrack_sip.o
+obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o
# generic X tables
obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
diff --git a/net/netfilter/nf_conntrack_tftp.c b/net/netfilter/nf_conntrack_tftp.c
new file mode 100644
index 0000000..d46a126
--- /dev/null
+++ b/net/netfilter/nf_conntrack_tftp.c
@@ -0,0 +1,159 @@
+/* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/in.h>
+#include <linux/udp.h>
+
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_tuple.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <linux/netfilter/nf_conntrack_tftp.h>
+
+MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
+MODULE_DESCRIPTION("TFTP connection tracking helper");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ip_conntrack_tftp");
+
+#define MAX_PORTS 8
+static unsigned short ports[MAX_PORTS];
+static int ports_c;
+module_param_array(ports, ushort, &ports_c, 0400);
+MODULE_PARM_DESC(ports, "Port numbers of TFTP servers");
+
+#if 0
+#define DEBUGP(format, args...) printk("%s:%s:" format, \
+ __FILE__, __FUNCTION__ , ## args)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+unsigned int (*nf_nat_tftp_hook)(struct sk_buff **pskb,
+ enum ip_conntrack_info ctinfo,
+ struct nf_conntrack_expect *exp) __read_mostly;
+EXPORT_SYMBOL_GPL(nf_nat_tftp_hook);
+
+static int tftp_help(struct sk_buff **pskb,
+ unsigned int protoff,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ struct tftphdr _tftph, *tfh;
+ struct nf_conntrack_expect *exp;
+ struct nf_conntrack_tuple *tuple;
+ unsigned int ret = NF_ACCEPT;
+ int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
+ typeof(nf_nat_tftp_hook) nf_nat_tftp;
+
+ tfh = skb_header_pointer(*pskb, protoff + sizeof(struct udphdr),
+ sizeof(_tftph), &_tftph);
+ if (tfh == NULL)
+ return NF_ACCEPT;
+
+ switch (ntohs(tfh->opcode)) {
+ case TFTP_OPCODE_READ:
+ case TFTP_OPCODE_WRITE:
+ /* RRQ and WRQ works the same way */
+ DEBUGP("");
+ NF_CT_DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+ NF_CT_DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+
+ exp = nf_conntrack_expect_alloc(ct);
+ if (exp == NULL)
+ return NF_DROP;
+ tuple = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;
+ nf_conntrack_expect_init(exp, family,
+ &tuple->src.u3, &tuple->dst.u3,
+ IPPROTO_UDP,
+ NULL, &tuple->dst.u.udp.port);
+
+ DEBUGP("expect: ");
+ NF_CT_DUMP_TUPLE(&exp->tuple);
+ NF_CT_DUMP_TUPLE(&exp->mask);
+
+ nf_nat_tftp = rcu_dereference(nf_nat_tftp_hook);
+ if (nf_nat_tftp && ct->status & IPS_NAT_MASK)
+ ret = nf_nat_tftp(pskb, ctinfo, exp);
+ else if (nf_conntrack_expect_related(exp) != 0)
+ ret = NF_DROP;
+ nf_conntrack_expect_put(exp);
+ break;
+ case TFTP_OPCODE_DATA:
+ case TFTP_OPCODE_ACK:
+ DEBUGP("Data/ACK opcode\n");
+ break;
+ case TFTP_OPCODE_ERROR:
+ DEBUGP("Error opcode\n");
+ break;
+ default:
+ DEBUGP("Unknown opcode\n");
+ }
+ return ret;
+}
+
+static struct nf_conntrack_helper tftp[MAX_PORTS][2] __read_mostly;
+static char tftp_names[MAX_PORTS][2][sizeof("tftp-65535")] __read_mostly;
+
+static void nf_conntrack_tftp_fini(void)
+{
+ int i, j;
+
+ for (i = 0; i < ports_c; i++) {
+ for (j = 0; j < 2; j++)
+ nf_conntrack_helper_unregister(&tftp[i][j]);
+ }
+}
+
+static int __init nf_conntrack_tftp_init(void)
+{
+ int i, j, ret;
+ char *tmpname;
+
+ if (ports_c == 0)
+ ports[ports_c++] = TFTP_PORT;
+
+ for (i = 0; i < ports_c; i++) {
+ memset(&tftp[i], 0, sizeof(tftp[i]));
+
+ tftp[i][0].tuple.src.l3num = AF_INET;
+ tftp[i][1].tuple.src.l3num = AF_INET6;
+ for (j = 0; j < 2; j++) {
+ tftp[i][j].tuple.dst.protonum = IPPROTO_UDP;
+ tftp[i][j].tuple.src.u.udp.port = htons(ports[i]);
+ tftp[i][j].mask.src.l3num = 0xFFFF;
+ tftp[i][j].mask.dst.protonum = 0xFF;
+ tftp[i][j].mask.src.u.udp.port = htons(0xFFFF);
+ tftp[i][j].max_expected = 1;
+ tftp[i][j].timeout = 5 * 60; /* 5 minutes */
+ tftp[i][j].me = THIS_MODULE;
+ tftp[i][j].help = tftp_help;
+
+ tmpname = &tftp_names[i][j][0];
+ if (ports[i] == TFTP_PORT)
+ sprintf(tmpname, "tftp");
+ else
+ sprintf(tmpname, "tftp-%u", i);
+ tftp[i][j].name = tmpname;
+
+ ret = nf_conntrack_helper_register(&tftp[i][j]);
+ if (ret) {
+ printk("nf_ct_tftp: failed to register helper "
+ "for pf: %u port: %u\n",
+ tftp[i][j].tuple.src.l3num, ports[i]);
+ nf_conntrack_tftp_fini();
+ return ret;
+ }
+ }
+ }
+ return 0;
+}
+
+module_init(nf_conntrack_tftp_init);
+module_exit(nf_conntrack_tftp_fini);
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 18/20]: nf_nat: add SNMP NAT helper port
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (15 preceding siblings ...)
2006-12-02 14:50 ` [NETFILTER 17/20]: nf_conntrack/nf_nat: add TFTP " Patrick McHardy
@ 2006-12-02 14:50 ` Patrick McHardy
2006-12-02 14:50 ` [NETFILTER 19/20]: Mark old IPv4-only connection tracking scheduled for removal Patrick McHardy
` (3 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:50 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_nat: add SNMP NAT helper port
Add nf_conntrack port of the SNMP NAT helper.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit 49bfa626948b29f57cc2dc524215abe314926966
tree fcc050507344b1742326e36ba7de25120191dedd
parent e95138a41a63f7da0d8969c6a00f6f632b912b28
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:24 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:24 +0100
net/ipv4/netfilter/Kconfig | 15
net/ipv4/netfilter/Makefile | 1
net/ipv4/netfilter/nf_nat_snmp_basic.c | 1332 ++++++++++++++++++++++++++++++++
3 files changed, 1348 insertions(+), 0 deletions(-)
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 1c0018b..16390ad 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -477,6 +477,21 @@ config IP_NF_NAT_SNMP_BASIC
To compile it as a module, choose M here. If unsure, say N.
+config NF_NAT_SNMP_BASIC
+ tristate "Basic SNMP-ALG support (EXPERIMENTAL)"
+ depends on EXPERIMENTAL && NF_NAT
+ ---help---
+
+ This module implements an Application Layer Gateway (ALG) for
+ SNMP payloads. In conjunction with NAT, it allows a network
+ management system to access multiple private networks with
+ conflicting addresses. It works by modifying IP addresses
+ inside SNMP payloads to match IP-layer NAT mapping.
+
+ This is the "basic" form of SNMP-ALG, as described in RFC 2962
+
+ To compile it as a module, choose M here. If unsure, say N.
+
# If they want FTP, set to $CONFIG_IP_NF_NAT (m or y),
# or $CONFIG_IP_NF_FTP (m or y), whichever is weaker.
# From kconfig-language.txt:
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 3ca0af0..15e741a 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323
obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o
obj-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
+obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o
obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o
# NAT protocols (nf_nat)
diff --git a/net/ipv4/netfilter/nf_nat_snmp_basic.c b/net/ipv4/netfilter/nf_nat_snmp_basic.c
new file mode 100644
index 0000000..f12528f
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_snmp_basic.c
@@ -0,0 +1,1332 @@
+/*
+ * nf_nat_snmp_basic.c
+ *
+ * Basic SNMP Application Layer Gateway
+ *
+ * This IP NAT module is intended for use with SNMP network
+ * discovery and monitoring applications where target networks use
+ * conflicting private address realms.
+ *
+ * Static NAT is used to remap the networks from the view of the network
+ * management system at the IP layer, and this module remaps some application
+ * layer addresses to match.
+ *
+ * The simplest form of ALG is performed, where only tagged IP addresses
+ * are modified. The module does not need to be MIB aware and only scans
+ * messages at the ASN.1/BER level.
+ *
+ * Currently, only SNMPv1 and SNMPv2 are supported.
+ *
+ * More information on ALG and associated issues can be found in
+ * RFC 2962
+ *
+ * The ASB.1/BER parsing code is derived from the gxsnmp package by Gregory
+ * McLean & Jochen Friedrich, stripped down for use in the kernel.
+ *
+ * Copyright (c) 2000 RP Internet (www.rpi.net.au).
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: James Morris <jmorris@intercode.com.au>
+ *
+ * Updates:
+ * 2000-08-06: Convert to new helper API (Harald Welte).
+ *
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <net/checksum.h>
+#include <net/udp.h>
+
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_nat_helper.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
+MODULE_DESCRIPTION("Basic SNMP Application Layer Gateway");
+MODULE_ALIAS("ip_nat_snmp_basic");
+
+#define SNMP_PORT 161
+#define SNMP_TRAP_PORT 162
+#define NOCT1(n) (*(u8 *)n)
+
+static int debug;
+static DEFINE_SPINLOCK(snmp_lock);
+
+/*
+ * Application layer address mapping mimics the NAT mapping, but
+ * only for the first octet in this case (a more flexible system
+ * can be implemented if needed).
+ */
+struct oct1_map
+{
+ u_int8_t from;
+ u_int8_t to;
+};
+
+
+/*****************************************************************************
+ *
+ * Basic ASN.1 decoding routines (gxsnmp author Dirk Wisse)
+ *
+ *****************************************************************************/
+
+/* Class */
+#define ASN1_UNI 0 /* Universal */
+#define ASN1_APL 1 /* Application */
+#define ASN1_CTX 2 /* Context */
+#define ASN1_PRV 3 /* Private */
+
+/* Tag */
+#define ASN1_EOC 0 /* End Of Contents */
+#define ASN1_BOL 1 /* Boolean */
+#define ASN1_INT 2 /* Integer */
+#define ASN1_BTS 3 /* Bit String */
+#define ASN1_OTS 4 /* Octet String */
+#define ASN1_NUL 5 /* Null */
+#define ASN1_OJI 6 /* Object Identifier */
+#define ASN1_OJD 7 /* Object Description */
+#define ASN1_EXT 8 /* External */
+#define ASN1_SEQ 16 /* Sequence */
+#define ASN1_SET 17 /* Set */
+#define ASN1_NUMSTR 18 /* Numerical String */
+#define ASN1_PRNSTR 19 /* Printable String */
+#define ASN1_TEXSTR 20 /* Teletext String */
+#define ASN1_VIDSTR 21 /* Video String */
+#define ASN1_IA5STR 22 /* IA5 String */
+#define ASN1_UNITIM 23 /* Universal Time */
+#define ASN1_GENTIM 24 /* General Time */
+#define ASN1_GRASTR 25 /* Graphical String */
+#define ASN1_VISSTR 26 /* Visible String */
+#define ASN1_GENSTR 27 /* General String */
+
+/* Primitive / Constructed methods*/
+#define ASN1_PRI 0 /* Primitive */
+#define ASN1_CON 1 /* Constructed */
+
+/*
+ * Error codes.
+ */
+#define ASN1_ERR_NOERROR 0
+#define ASN1_ERR_DEC_EMPTY 2
+#define ASN1_ERR_DEC_EOC_MISMATCH 3
+#define ASN1_ERR_DEC_LENGTH_MISMATCH 4
+#define ASN1_ERR_DEC_BADVALUE 5
+
+/*
+ * ASN.1 context.
+ */
+struct asn1_ctx
+{
+ int error; /* Error condition */
+ unsigned char *pointer; /* Octet just to be decoded */
+ unsigned char *begin; /* First octet */
+ unsigned char *end; /* Octet after last octet */
+};
+
+/*
+ * Octet string (not null terminated)
+ */
+struct asn1_octstr
+{
+ unsigned char *data;
+ unsigned int len;
+};
+
+static void asn1_open(struct asn1_ctx *ctx,
+ unsigned char *buf,
+ unsigned int len)
+{
+ ctx->begin = buf;
+ ctx->end = buf + len;
+ ctx->pointer = buf;
+ ctx->error = ASN1_ERR_NOERROR;
+}
+
+static unsigned char asn1_octet_decode(struct asn1_ctx *ctx, unsigned char *ch)
+{
+ if (ctx->pointer >= ctx->end) {
+ ctx->error = ASN1_ERR_DEC_EMPTY;
+ return 0;
+ }
+ *ch = *(ctx->pointer)++;
+ return 1;
+}
+
+static unsigned char asn1_tag_decode(struct asn1_ctx *ctx, unsigned int *tag)
+{
+ unsigned char ch;
+
+ *tag = 0;
+
+ do
+ {
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+ *tag <<= 7;
+ *tag |= ch & 0x7F;
+ } while ((ch & 0x80) == 0x80);
+ return 1;
+}
+
+static unsigned char asn1_id_decode(struct asn1_ctx *ctx,
+ unsigned int *cls,
+ unsigned int *con,
+ unsigned int *tag)
+{
+ unsigned char ch;
+
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+
+ *cls = (ch & 0xC0) >> 6;
+ *con = (ch & 0x20) >> 5;
+ *tag = (ch & 0x1F);
+
+ if (*tag == 0x1F) {
+ if (!asn1_tag_decode(ctx, tag))
+ return 0;
+ }
+ return 1;
+}
+
+static unsigned char asn1_length_decode(struct asn1_ctx *ctx,
+ unsigned int *def,
+ unsigned int *len)
+{
+ unsigned char ch, cnt;
+
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+
+ if (ch == 0x80)
+ *def = 0;
+ else {
+ *def = 1;
+
+ if (ch < 0x80)
+ *len = ch;
+ else {
+ cnt = (unsigned char) (ch & 0x7F);
+ *len = 0;
+
+ while (cnt > 0) {
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+ *len <<= 8;
+ *len |= ch;
+ cnt--;
+ }
+ }
+ }
+ return 1;
+}
+
+static unsigned char asn1_header_decode(struct asn1_ctx *ctx,
+ unsigned char **eoc,
+ unsigned int *cls,
+ unsigned int *con,
+ unsigned int *tag)
+{
+ unsigned int def, len;
+
+ if (!asn1_id_decode(ctx, cls, con, tag))
+ return 0;
+
+ def = len = 0;
+ if (!asn1_length_decode(ctx, &def, &len))
+ return 0;
+
+ if (def)
+ *eoc = ctx->pointer + len;
+ else
+ *eoc = NULL;
+ return 1;
+}
+
+static unsigned char asn1_eoc_decode(struct asn1_ctx *ctx, unsigned char *eoc)
+{
+ unsigned char ch;
+
+ if (eoc == 0) {
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+
+ if (ch != 0x00) {
+ ctx->error = ASN1_ERR_DEC_EOC_MISMATCH;
+ return 0;
+ }
+
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+
+ if (ch != 0x00) {
+ ctx->error = ASN1_ERR_DEC_EOC_MISMATCH;
+ return 0;
+ }
+ return 1;
+ } else {
+ if (ctx->pointer != eoc) {
+ ctx->error = ASN1_ERR_DEC_LENGTH_MISMATCH;
+ return 0;
+ }
+ return 1;
+ }
+}
+
+static unsigned char asn1_null_decode(struct asn1_ctx *ctx, unsigned char *eoc)
+{
+ ctx->pointer = eoc;
+ return 1;
+}
+
+static unsigned char asn1_long_decode(struct asn1_ctx *ctx,
+ unsigned char *eoc,
+ long *integer)
+{
+ unsigned char ch;
+ unsigned int len;
+
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+
+ *integer = (signed char) ch;
+ len = 1;
+
+ while (ctx->pointer < eoc) {
+ if (++len > sizeof (long)) {
+ ctx->error = ASN1_ERR_DEC_BADVALUE;
+ return 0;
+ }
+
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+
+ *integer <<= 8;
+ *integer |= ch;
+ }
+ return 1;
+}
+
+static unsigned char asn1_uint_decode(struct asn1_ctx *ctx,
+ unsigned char *eoc,
+ unsigned int *integer)
+{
+ unsigned char ch;
+ unsigned int len;
+
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+
+ *integer = ch;
+ if (ch == 0) len = 0;
+ else len = 1;
+
+ while (ctx->pointer < eoc) {
+ if (++len > sizeof (unsigned int)) {
+ ctx->error = ASN1_ERR_DEC_BADVALUE;
+ return 0;
+ }
+
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+
+ *integer <<= 8;
+ *integer |= ch;
+ }
+ return 1;
+}
+
+static unsigned char asn1_ulong_decode(struct asn1_ctx *ctx,
+ unsigned char *eoc,
+ unsigned long *integer)
+{
+ unsigned char ch;
+ unsigned int len;
+
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+
+ *integer = ch;
+ if (ch == 0) len = 0;
+ else len = 1;
+
+ while (ctx->pointer < eoc) {
+ if (++len > sizeof (unsigned long)) {
+ ctx->error = ASN1_ERR_DEC_BADVALUE;
+ return 0;
+ }
+
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+
+ *integer <<= 8;
+ *integer |= ch;
+ }
+ return 1;
+}
+
+static unsigned char asn1_octets_decode(struct asn1_ctx *ctx,
+ unsigned char *eoc,
+ unsigned char **octets,
+ unsigned int *len)
+{
+ unsigned char *ptr;
+
+ *len = 0;
+
+ *octets = kmalloc(eoc - ctx->pointer, GFP_ATOMIC);
+ if (*octets == NULL) {
+ if (net_ratelimit())
+ printk("OOM in bsalg (%d)\n", __LINE__);
+ return 0;
+ }
+
+ ptr = *octets;
+ while (ctx->pointer < eoc) {
+ if (!asn1_octet_decode(ctx, (unsigned char *)ptr++)) {
+ kfree(*octets);
+ *octets = NULL;
+ return 0;
+ }
+ (*len)++;
+ }
+ return 1;
+}
+
+static unsigned char asn1_subid_decode(struct asn1_ctx *ctx,
+ unsigned long *subid)
+{
+ unsigned char ch;
+
+ *subid = 0;
+
+ do {
+ if (!asn1_octet_decode(ctx, &ch))
+ return 0;
+
+ *subid <<= 7;
+ *subid |= ch & 0x7F;
+ } while ((ch & 0x80) == 0x80);
+ return 1;
+}
+
+static unsigned char asn1_oid_decode(struct asn1_ctx *ctx,
+ unsigned char *eoc,
+ unsigned long **oid,
+ unsigned int *len)
+{
+ unsigned long subid;
+ unsigned int size;
+ unsigned long *optr;
+
+ size = eoc - ctx->pointer + 1;
+ *oid = kmalloc(size * sizeof(unsigned long), GFP_ATOMIC);
+ if (*oid == NULL) {
+ if (net_ratelimit())
+ printk("OOM in bsalg (%d)\n", __LINE__);
+ return 0;
+ }
+
+ optr = *oid;
+
+ if (!asn1_subid_decode(ctx, &subid)) {
+ kfree(*oid);
+ *oid = NULL;
+ return 0;
+ }
+
+ if (subid < 40) {
+ optr [0] = 0;
+ optr [1] = subid;
+ } else if (subid < 80) {
+ optr [0] = 1;
+ optr [1] = subid - 40;
+ } else {
+ optr [0] = 2;
+ optr [1] = subid - 80;
+ }
+
+ *len = 2;
+ optr += 2;
+
+ while (ctx->pointer < eoc) {
+ if (++(*len) > size) {
+ ctx->error = ASN1_ERR_DEC_BADVALUE;
+ kfree(*oid);
+ *oid = NULL;
+ return 0;
+ }
+
+ if (!asn1_subid_decode(ctx, optr++)) {
+ kfree(*oid);
+ *oid = NULL;
+ return 0;
+ }
+ }
+ return 1;
+}
+
+/*****************************************************************************
+ *
+ * SNMP decoding routines (gxsnmp author Dirk Wisse)
+ *
+ *****************************************************************************/
+
+/* SNMP Versions */
+#define SNMP_V1 0
+#define SNMP_V2C 1
+#define SNMP_V2 2
+#define SNMP_V3 3
+
+/* Default Sizes */
+#define SNMP_SIZE_COMM 256
+#define SNMP_SIZE_OBJECTID 128
+#define SNMP_SIZE_BUFCHR 256
+#define SNMP_SIZE_BUFINT 128
+#define SNMP_SIZE_SMALLOBJECTID 16
+
+/* Requests */
+#define SNMP_PDU_GET 0
+#define SNMP_PDU_NEXT 1
+#define SNMP_PDU_RESPONSE 2
+#define SNMP_PDU_SET 3
+#define SNMP_PDU_TRAP1 4
+#define SNMP_PDU_BULK 5
+#define SNMP_PDU_INFORM 6
+#define SNMP_PDU_TRAP2 7
+
+/* Errors */
+#define SNMP_NOERROR 0
+#define SNMP_TOOBIG 1
+#define SNMP_NOSUCHNAME 2
+#define SNMP_BADVALUE 3
+#define SNMP_READONLY 4
+#define SNMP_GENERROR 5
+#define SNMP_NOACCESS 6
+#define SNMP_WRONGTYPE 7
+#define SNMP_WRONGLENGTH 8
+#define SNMP_WRONGENCODING 9
+#define SNMP_WRONGVALUE 10
+#define SNMP_NOCREATION 11
+#define SNMP_INCONSISTENTVALUE 12
+#define SNMP_RESOURCEUNAVAILABLE 13
+#define SNMP_COMMITFAILED 14
+#define SNMP_UNDOFAILED 15
+#define SNMP_AUTHORIZATIONERROR 16
+#define SNMP_NOTWRITABLE 17
+#define SNMP_INCONSISTENTNAME 18
+
+/* General SNMP V1 Traps */
+#define SNMP_TRAP_COLDSTART 0
+#define SNMP_TRAP_WARMSTART 1
+#define SNMP_TRAP_LINKDOWN 2
+#define SNMP_TRAP_LINKUP 3
+#define SNMP_TRAP_AUTFAILURE 4
+#define SNMP_TRAP_EQPNEIGHBORLOSS 5
+#define SNMP_TRAP_ENTSPECIFIC 6
+
+/* SNMPv1 Types */
+#define SNMP_NULL 0
+#define SNMP_INTEGER 1 /* l */
+#define SNMP_OCTETSTR 2 /* c */
+#define SNMP_DISPLAYSTR 2 /* c */
+#define SNMP_OBJECTID 3 /* ul */
+#define SNMP_IPADDR 4 /* uc */
+#define SNMP_COUNTER 5 /* ul */
+#define SNMP_GAUGE 6 /* ul */
+#define SNMP_TIMETICKS 7 /* ul */
+#define SNMP_OPAQUE 8 /* c */
+
+/* Additional SNMPv2 Types */
+#define SNMP_UINTEGER 5 /* ul */
+#define SNMP_BITSTR 9 /* uc */
+#define SNMP_NSAP 10 /* uc */
+#define SNMP_COUNTER64 11 /* ul */
+#define SNMP_NOSUCHOBJECT 12
+#define SNMP_NOSUCHINSTANCE 13
+#define SNMP_ENDOFMIBVIEW 14
+
+union snmp_syntax
+{
+ unsigned char uc[0]; /* 8 bit unsigned */
+ char c[0]; /* 8 bit signed */
+ unsigned long ul[0]; /* 32 bit unsigned */
+ long l[0]; /* 32 bit signed */
+};
+
+struct snmp_object
+{
+ unsigned long *id;
+ unsigned int id_len;
+ unsigned short type;
+ unsigned int syntax_len;
+ union snmp_syntax syntax;
+};
+
+struct snmp_request
+{
+ unsigned long id;
+ unsigned int error_status;
+ unsigned int error_index;
+};
+
+struct snmp_v1_trap
+{
+ unsigned long *id;
+ unsigned int id_len;
+ unsigned long ip_address; /* pointer */
+ unsigned int general;
+ unsigned int specific;
+ unsigned long time;
+};
+
+/* SNMP types */
+#define SNMP_IPA 0
+#define SNMP_CNT 1
+#define SNMP_GGE 2
+#define SNMP_TIT 3
+#define SNMP_OPQ 4
+#define SNMP_C64 6
+
+/* SNMP errors */
+#define SERR_NSO 0
+#define SERR_NSI 1
+#define SERR_EOM 2
+
+static inline void mangle_address(unsigned char *begin,
+ unsigned char *addr,
+ const struct oct1_map *map,
+ __sum16 *check);
+struct snmp_cnv
+{
+ unsigned int class;
+ unsigned int tag;
+ int syntax;
+};
+
+static struct snmp_cnv snmp_conv [] =
+{
+ {ASN1_UNI, ASN1_NUL, SNMP_NULL},
+ {ASN1_UNI, ASN1_INT, SNMP_INTEGER},
+ {ASN1_UNI, ASN1_OTS, SNMP_OCTETSTR},
+ {ASN1_UNI, ASN1_OTS, SNMP_DISPLAYSTR},
+ {ASN1_UNI, ASN1_OJI, SNMP_OBJECTID},
+ {ASN1_APL, SNMP_IPA, SNMP_IPADDR},
+ {ASN1_APL, SNMP_CNT, SNMP_COUNTER}, /* Counter32 */
+ {ASN1_APL, SNMP_GGE, SNMP_GAUGE}, /* Gauge32 == Unsigned32 */
+ {ASN1_APL, SNMP_TIT, SNMP_TIMETICKS},
+ {ASN1_APL, SNMP_OPQ, SNMP_OPAQUE},
+
+ /* SNMPv2 data types and errors */
+ {ASN1_UNI, ASN1_BTS, SNMP_BITSTR},
+ {ASN1_APL, SNMP_C64, SNMP_COUNTER64},
+ {ASN1_CTX, SERR_NSO, SNMP_NOSUCHOBJECT},
+ {ASN1_CTX, SERR_NSI, SNMP_NOSUCHINSTANCE},
+ {ASN1_CTX, SERR_EOM, SNMP_ENDOFMIBVIEW},
+ {0, 0, -1}
+};
+
+static unsigned char snmp_tag_cls2syntax(unsigned int tag,
+ unsigned int cls,
+ unsigned short *syntax)
+{
+ struct snmp_cnv *cnv;
+
+ cnv = snmp_conv;
+
+ while (cnv->syntax != -1) {
+ if (cnv->tag == tag && cnv->class == cls) {
+ *syntax = cnv->syntax;
+ return 1;
+ }
+ cnv++;
+ }
+ return 0;
+}
+
+static unsigned char snmp_object_decode(struct asn1_ctx *ctx,
+ struct snmp_object **obj)
+{
+ unsigned int cls, con, tag, len, idlen;
+ unsigned short type;
+ unsigned char *eoc, *end, *p;
+ unsigned long *lp, *id;
+ unsigned long ul;
+ long l;
+
+ *obj = NULL;
+ id = NULL;
+
+ if (!asn1_header_decode(ctx, &eoc, &cls, &con, &tag))
+ return 0;
+
+ if (cls != ASN1_UNI || con != ASN1_CON || tag != ASN1_SEQ)
+ return 0;
+
+ if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+ return 0;
+
+ if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_OJI)
+ return 0;
+
+ if (!asn1_oid_decode(ctx, end, &id, &idlen))
+ return 0;
+
+ if (!asn1_header_decode(ctx, &end, &cls, &con, &tag)) {
+ kfree(id);
+ return 0;
+ }
+
+ if (con != ASN1_PRI) {
+ kfree(id);
+ return 0;
+ }
+
+ type = 0;
+ if (!snmp_tag_cls2syntax(tag, cls, &type)) {
+ kfree(id);
+ return 0;
+ }
+
+ l = 0;
+ switch (type) {
+ case SNMP_INTEGER:
+ len = sizeof(long);
+ if (!asn1_long_decode(ctx, end, &l)) {
+ kfree(id);
+ return 0;
+ }
+ *obj = kmalloc(sizeof(struct snmp_object) + len,
+ GFP_ATOMIC);
+ if (*obj == NULL) {
+ kfree(id);
+ if (net_ratelimit())
+ printk("OOM in bsalg (%d)\n", __LINE__);
+ return 0;
+ }
+ (*obj)->syntax.l[0] = l;
+ break;
+ case SNMP_OCTETSTR:
+ case SNMP_OPAQUE:
+ if (!asn1_octets_decode(ctx, end, &p, &len)) {
+ kfree(id);
+ return 0;
+ }
+ *obj = kmalloc(sizeof(struct snmp_object) + len,
+ GFP_ATOMIC);
+ if (*obj == NULL) {
+ kfree(id);
+ if (net_ratelimit())
+ printk("OOM in bsalg (%d)\n", __LINE__);
+ return 0;
+ }
+ memcpy((*obj)->syntax.c, p, len);
+ kfree(p);
+ break;
+ case SNMP_NULL:
+ case SNMP_NOSUCHOBJECT:
+ case SNMP_NOSUCHINSTANCE:
+ case SNMP_ENDOFMIBVIEW:
+ len = 0;
+ *obj = kmalloc(sizeof(struct snmp_object), GFP_ATOMIC);
+ if (*obj == NULL) {
+ kfree(id);
+ if (net_ratelimit())
+ printk("OOM in bsalg (%d)\n", __LINE__);
+ return 0;
+ }
+ if (!asn1_null_decode(ctx, end)) {
+ kfree(id);
+ kfree(*obj);
+ *obj = NULL;
+ return 0;
+ }
+ break;
+ case SNMP_OBJECTID:
+ if (!asn1_oid_decode(ctx, end, (unsigned long **)&lp, &len)) {
+ kfree(id);
+ return 0;
+ }
+ len *= sizeof(unsigned long);
+ *obj = kmalloc(sizeof(struct snmp_object) + len, GFP_ATOMIC);
+ if (*obj == NULL) {
+ kfree(lp);
+ kfree(id);
+ if (net_ratelimit())
+ printk("OOM in bsalg (%d)\n", __LINE__);
+ return 0;
+ }
+ memcpy((*obj)->syntax.ul, lp, len);
+ kfree(lp);
+ break;
+ case SNMP_IPADDR:
+ if (!asn1_octets_decode(ctx, end, &p, &len)) {
+ kfree(id);
+ return 0;
+ }
+ if (len != 4) {
+ kfree(p);
+ kfree(id);
+ return 0;
+ }
+ *obj = kmalloc(sizeof(struct snmp_object) + len, GFP_ATOMIC);
+ if (*obj == NULL) {
+ kfree(p);
+ kfree(id);
+ if (net_ratelimit())
+ printk("OOM in bsalg (%d)\n", __LINE__);
+ return 0;
+ }
+ memcpy((*obj)->syntax.uc, p, len);
+ kfree(p);
+ break;
+ case SNMP_COUNTER:
+ case SNMP_GAUGE:
+ case SNMP_TIMETICKS:
+ len = sizeof(unsigned long);
+ if (!asn1_ulong_decode(ctx, end, &ul)) {
+ kfree(id);
+ return 0;
+ }
+ *obj = kmalloc(sizeof(struct snmp_object) + len, GFP_ATOMIC);
+ if (*obj == NULL) {
+ kfree(id);
+ if (net_ratelimit())
+ printk("OOM in bsalg (%d)\n", __LINE__);
+ return 0;
+ }
+ (*obj)->syntax.ul[0] = ul;
+ break;
+ default:
+ kfree(id);
+ return 0;
+ }
+
+ (*obj)->syntax_len = len;
+ (*obj)->type = type;
+ (*obj)->id = id;
+ (*obj)->id_len = idlen;
+
+ if (!asn1_eoc_decode(ctx, eoc)) {
+ kfree(id);
+ kfree(*obj);
+ *obj = NULL;
+ return 0;
+ }
+ return 1;
+}
+
+static unsigned char snmp_request_decode(struct asn1_ctx *ctx,
+ struct snmp_request *request)
+{
+ unsigned int cls, con, tag;
+ unsigned char *end;
+
+ if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+ return 0;
+
+ if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
+ return 0;
+
+ if (!asn1_ulong_decode(ctx, end, &request->id))
+ return 0;
+
+ if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+ return 0;
+
+ if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
+ return 0;
+
+ if (!asn1_uint_decode(ctx, end, &request->error_status))
+ return 0;
+
+ if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+ return 0;
+
+ if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
+ return 0;
+
+ if (!asn1_uint_decode(ctx, end, &request->error_index))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Fast checksum update for possibly oddly-aligned UDP byte, from the
+ * code example in the draft.
+ */
+static void fast_csum(__sum16 *csum,
+ const unsigned char *optr,
+ const unsigned char *nptr,
+ int offset)
+{
+ unsigned char s[4];
+
+ if (offset & 1) {
+ s[0] = s[2] = 0;
+ s[1] = ~*optr;
+ s[3] = *nptr;
+ } else {
+ s[1] = s[3] = 0;
+ s[0] = ~*optr;
+ s[2] = *nptr;
+ }
+
+ *csum = csum_fold(csum_partial(s, 4, ~csum_unfold(*csum)));
+}
+
+/*
+ * Mangle IP address.
+ * - begin points to the start of the snmp messgae
+ * - addr points to the start of the address
+ */
+static inline void mangle_address(unsigned char *begin,
+ unsigned char *addr,
+ const struct oct1_map *map,
+ __sum16 *check)
+{
+ if (map->from == NOCT1(addr)) {
+ u_int32_t old;
+
+ if (debug)
+ memcpy(&old, (unsigned char *)addr, sizeof(old));
+
+ *addr = map->to;
+
+ /* Update UDP checksum if being used */
+ if (*check) {
+ fast_csum(check,
+ &map->from, &map->to, addr - begin);
+
+ }
+
+ if (debug)
+ printk(KERN_DEBUG "bsalg: mapped %u.%u.%u.%u to "
+ "%u.%u.%u.%u\n", NIPQUAD(old), NIPQUAD(*addr));
+ }
+}
+
+static unsigned char snmp_trap_decode(struct asn1_ctx *ctx,
+ struct snmp_v1_trap *trap,
+ const struct oct1_map *map,
+ __sum16 *check)
+{
+ unsigned int cls, con, tag, len;
+ unsigned char *end;
+
+ if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+ return 0;
+
+ if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_OJI)
+ return 0;
+
+ if (!asn1_oid_decode(ctx, end, &trap->id, &trap->id_len))
+ return 0;
+
+ if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+ goto err_id_free;
+
+ if (!((cls == ASN1_APL && con == ASN1_PRI && tag == SNMP_IPA) ||
+ (cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_OTS)))
+ goto err_id_free;
+
+ if (!asn1_octets_decode(ctx, end, (unsigned char **)&trap->ip_address, &len))
+ goto err_id_free;
+
+ /* IPv4 only */
+ if (len != 4)
+ goto err_addr_free;
+
+ mangle_address(ctx->begin, ctx->pointer - 4, map, check);
+
+ if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+ goto err_addr_free;
+
+ if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
+ goto err_addr_free;
+
+ if (!asn1_uint_decode(ctx, end, &trap->general))
+ goto err_addr_free;
+
+ if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+ goto err_addr_free;
+
+ if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
+ goto err_addr_free;
+
+ if (!asn1_uint_decode(ctx, end, &trap->specific))
+ goto err_addr_free;
+
+ if (!asn1_header_decode(ctx, &end, &cls, &con, &tag))
+ goto err_addr_free;
+
+ if (!((cls == ASN1_APL && con == ASN1_PRI && tag == SNMP_TIT) ||
+ (cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_INT)))
+ goto err_addr_free;
+
+ if (!asn1_ulong_decode(ctx, end, &trap->time))
+ goto err_addr_free;
+
+ return 1;
+
+err_addr_free:
+ kfree((unsigned long *)trap->ip_address);
+
+err_id_free:
+ kfree(trap->id);
+
+ return 0;
+}
+
+/*****************************************************************************
+ *
+ * Misc. routines
+ *
+ *****************************************************************************/
+
+static void hex_dump(unsigned char *buf, size_t len)
+{
+ size_t i;
+
+ for (i = 0; i < len; i++) {
+ if (i && !(i % 16))
+ printk("\n");
+ printk("%02x ", *(buf + i));
+ }
+ printk("\n");
+}
+
+/*
+ * Parse and mangle SNMP message according to mapping.
+ * (And this is the fucking 'basic' method).
+ */
+static int snmp_parse_mangle(unsigned char *msg,
+ u_int16_t len,
+ const struct oct1_map *map,
+ __sum16 *check)
+{
+ unsigned char *eoc, *end;
+ unsigned int cls, con, tag, vers, pdutype;
+ struct asn1_ctx ctx;
+ struct asn1_octstr comm;
+ struct snmp_object **obj;
+
+ if (debug > 1)
+ hex_dump(msg, len);
+
+ asn1_open(&ctx, msg, len);
+
+ /*
+ * Start of SNMP message.
+ */
+ if (!asn1_header_decode(&ctx, &eoc, &cls, &con, &tag))
+ return 0;
+ if (cls != ASN1_UNI || con != ASN1_CON || tag != ASN1_SEQ)
+ return 0;
+
+ /*
+ * Version 1 or 2 handled.
+ */
+ if (!asn1_header_decode(&ctx, &end, &cls, &con, &tag))
+ return 0;
+ if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_INT)
+ return 0;
+ if (!asn1_uint_decode (&ctx, end, &vers))
+ return 0;
+ if (debug > 1)
+ printk(KERN_DEBUG "bsalg: snmp version: %u\n", vers + 1);
+ if (vers > 1)
+ return 1;
+
+ /*
+ * Community.
+ */
+ if (!asn1_header_decode (&ctx, &end, &cls, &con, &tag))
+ return 0;
+ if (cls != ASN1_UNI || con != ASN1_PRI || tag != ASN1_OTS)
+ return 0;
+ if (!asn1_octets_decode(&ctx, end, &comm.data, &comm.len))
+ return 0;
+ if (debug > 1) {
+ unsigned int i;
+
+ printk(KERN_DEBUG "bsalg: community: ");
+ for (i = 0; i < comm.len; i++)
+ printk("%c", comm.data[i]);
+ printk("\n");
+ }
+ kfree(comm.data);
+
+ /*
+ * PDU type
+ */
+ if (!asn1_header_decode(&ctx, &eoc, &cls, &con, &pdutype))
+ return 0;
+ if (cls != ASN1_CTX || con != ASN1_CON)
+ return 0;
+ if (debug > 1) {
+ unsigned char *pdus[] = {
+ [SNMP_PDU_GET] = "get",
+ [SNMP_PDU_NEXT] = "get-next",
+ [SNMP_PDU_RESPONSE] = "response",
+ [SNMP_PDU_SET] = "set",
+ [SNMP_PDU_TRAP1] = "trapv1",
+ [SNMP_PDU_BULK] = "bulk",
+ [SNMP_PDU_INFORM] = "inform",
+ [SNMP_PDU_TRAP2] = "trapv2"
+ };
+
+ if (pdutype > SNMP_PDU_TRAP2)
+ printk(KERN_DEBUG "bsalg: bad pdu type %u\n", pdutype);
+ else
+ printk(KERN_DEBUG "bsalg: pdu: %s\n", pdus[pdutype]);
+ }
+ if (pdutype != SNMP_PDU_RESPONSE &&
+ pdutype != SNMP_PDU_TRAP1 && pdutype != SNMP_PDU_TRAP2)
+ return 1;
+
+ /*
+ * Request header or v1 trap
+ */
+ if (pdutype == SNMP_PDU_TRAP1) {
+ struct snmp_v1_trap trap;
+ unsigned char ret = snmp_trap_decode(&ctx, &trap, map, check);
+
+ if (ret) {
+ kfree(trap.id);
+ kfree((unsigned long *)trap.ip_address);
+ } else
+ return ret;
+
+ } else {
+ struct snmp_request req;
+
+ if (!snmp_request_decode(&ctx, &req))
+ return 0;
+
+ if (debug > 1)
+ printk(KERN_DEBUG "bsalg: request: id=0x%lx error_status=%u "
+ "error_index=%u\n", req.id, req.error_status,
+ req.error_index);
+ }
+
+ /*
+ * Loop through objects, look for IP addresses to mangle.
+ */
+ if (!asn1_header_decode(&ctx, &eoc, &cls, &con, &tag))
+ return 0;
+
+ if (cls != ASN1_UNI || con != ASN1_CON || tag != ASN1_SEQ)
+ return 0;
+
+ obj = kmalloc(sizeof(struct snmp_object), GFP_ATOMIC);
+ if (obj == NULL) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "OOM in bsalg(%d)\n", __LINE__);
+ return 0;
+ }
+
+ while (!asn1_eoc_decode(&ctx, eoc)) {
+ unsigned int i;
+
+ if (!snmp_object_decode(&ctx, obj)) {
+ if (*obj) {
+ kfree((*obj)->id);
+ kfree(*obj);
+ }
+ kfree(obj);
+ return 0;
+ }
+
+ if (debug > 1) {
+ printk(KERN_DEBUG "bsalg: object: ");
+ for (i = 0; i < (*obj)->id_len; i++) {
+ if (i > 0)
+ printk(".");
+ printk("%lu", (*obj)->id[i]);
+ }
+ printk(": type=%u\n", (*obj)->type);
+
+ }
+
+ if ((*obj)->type == SNMP_IPADDR)
+ mangle_address(ctx.begin, ctx.pointer - 4 , map, check);
+
+ kfree((*obj)->id);
+ kfree(*obj);
+ }
+ kfree(obj);
+
+ if (!asn1_eoc_decode(&ctx, eoc))
+ return 0;
+
+ return 1;
+}
+
+/*****************************************************************************
+ *
+ * NAT routines.
+ *
+ *****************************************************************************/
+
+/*
+ * SNMP translation routine.
+ */
+static int snmp_translate(struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo,
+ struct sk_buff **pskb)
+{
+ struct iphdr *iph = (*pskb)->nh.iph;
+ struct udphdr *udph = (struct udphdr *)((__be32 *)iph + iph->ihl);
+ u_int16_t udplen = ntohs(udph->len);
+ u_int16_t paylen = udplen - sizeof(struct udphdr);
+ int dir = CTINFO2DIR(ctinfo);
+ struct oct1_map map;
+
+ /*
+ * Determine mappping for application layer addresses based
+ * on NAT manipulations for the packet.
+ */
+ if (dir == IP_CT_DIR_ORIGINAL) {
+ /* SNAT traps */
+ map.from = NOCT1(&ct->tuplehash[dir].tuple.src.u3.ip);
+ map.to = NOCT1(&ct->tuplehash[!dir].tuple.dst.u3.ip);
+ } else {
+ /* DNAT replies */
+ map.from = NOCT1(&ct->tuplehash[dir].tuple.src.u3.ip);
+ map.to = NOCT1(&ct->tuplehash[!dir].tuple.dst.u3.ip);
+ }
+
+ if (map.from == map.to)
+ return NF_ACCEPT;
+
+ if (!snmp_parse_mangle((unsigned char *)udph + sizeof(struct udphdr),
+ paylen, &map, &udph->check)) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "bsalg: parser failed\n");
+ return NF_DROP;
+ }
+ return NF_ACCEPT;
+}
+
+/* We don't actually set up expectations, just adjust internal IP
+ * addresses if this is being NATted */
+static int help(struct sk_buff **pskb, unsigned int protoff,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ int dir = CTINFO2DIR(ctinfo);
+ unsigned int ret;
+ struct iphdr *iph = (*pskb)->nh.iph;
+ struct udphdr *udph = (struct udphdr *)((u_int32_t *)iph + iph->ihl);
+
+ /* SNMP replies and originating SNMP traps get mangled */
+ if (udph->source == htons(SNMP_PORT) && dir != IP_CT_DIR_REPLY)
+ return NF_ACCEPT;
+ if (udph->dest == htons(SNMP_TRAP_PORT) && dir != IP_CT_DIR_ORIGINAL)
+ return NF_ACCEPT;
+
+ /* No NAT? */
+ if (!(ct->status & IPS_NAT_MASK))
+ return NF_ACCEPT;
+
+ /*
+ * Make sure the packet length is ok. So far, we were only guaranteed
+ * to have a valid length IP header plus 8 bytes, which means we have
+ * enough room for a UDP header. Just verify the UDP length field so we
+ * can mess around with the payload.
+ */
+ if (ntohs(udph->len) != (*pskb)->len - (iph->ihl << 2)) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "SNMP: dropping malformed packet "
+ "src=%u.%u.%u.%u dst=%u.%u.%u.%u\n",
+ NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
+ return NF_DROP;
+ }
+
+ if (!skb_make_writable(pskb, (*pskb)->len))
+ return NF_DROP;
+
+ spin_lock_bh(&snmp_lock);
+ ret = snmp_translate(ct, ctinfo, pskb);
+ spin_unlock_bh(&snmp_lock);
+ return ret;
+}
+
+static struct nf_conntrack_helper snmp_helper __read_mostly = {
+ .max_expected = 0,
+ .timeout = 180,
+ .me = THIS_MODULE,
+ .help = help,
+ .name = "snmp",
+ .tuple.src.l3num = AF_INET,
+ .tuple.src.u.udp.port = __constant_htons(SNMP_PORT),
+ .tuple.dst.protonum = IPPROTO_UDP,
+ .mask.src.l3num = 0xFFFF,
+ .mask.src.u.udp.port = __constant_htons(0xFFFF),
+ .mask.dst.protonum = 0xFF,
+};
+
+static struct nf_conntrack_helper snmp_trap_helper __read_mostly = {
+ .max_expected = 0,
+ .timeout = 180,
+ .me = THIS_MODULE,
+ .help = help,
+ .name = "snmp_trap",
+ .tuple.src.l3num = AF_INET,
+ .tuple.src.u.udp.port = __constant_htons(SNMP_TRAP_PORT),
+ .tuple.dst.protonum = IPPROTO_UDP,
+ .mask.src.l3num = 0xFFFF,
+ .mask.src.u.udp.port = __constant_htons(0xFFFF),
+ .mask.dst.protonum = 0xFF,
+};
+
+/*****************************************************************************
+ *
+ * Module stuff.
+ *
+ *****************************************************************************/
+
+static int __init nf_nat_snmp_basic_init(void)
+{
+ int ret = 0;
+
+ ret = nf_conntrack_helper_register(&snmp_helper);
+ if (ret < 0)
+ return ret;
+ ret = nf_conntrack_helper_register(&snmp_trap_helper);
+ if (ret < 0) {
+ nf_conntrack_helper_unregister(&snmp_helper);
+ return ret;
+ }
+ return ret;
+}
+
+static void __exit nf_nat_snmp_basic_fini(void)
+{
+ nf_conntrack_helper_unregister(&snmp_helper);
+ nf_conntrack_helper_unregister(&snmp_trap_helper);
+}
+
+module_init(nf_nat_snmp_basic_init);
+module_exit(nf_nat_snmp_basic_fini);
+
+module_param(debug, int, 0600);
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 19/20]: Mark old IPv4-only connection tracking scheduled for removal
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (16 preceding siblings ...)
2006-12-02 14:50 ` [NETFILTER 18/20]: nf_nat: add SNMP NAT " Patrick McHardy
@ 2006-12-02 14:50 ` Patrick McHardy
2006-12-02 14:50 ` [NETFILTER 20/20]: nf_conntrack: EXPORT_SYMBOL cleanup Patrick McHardy
` (2 subsequent siblings)
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:50 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: Mark old IPv4-only connection tracking scheduled for removal
Also remove the references to "new connection tracking" from Kconfig.
After some short stabilization period of the new connection tracking
helpers/NAT code the old one will be removed.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit 02d2bee5dd7717744d3a6cff529d9a71dc99452e
tree 5cae9cd141777f12739e25f8c20219c2f1983c7c
parent 49bfa626948b29f57cc2dc524215abe314926966
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:25 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:25 +0100
Documentation/feature-removal-schedule.txt | 9 +++++++++
net/ipv4/netfilter/Kconfig | 2 +-
net/ipv6/netfilter/Kconfig | 2 +-
net/netfilter/Kconfig | 6 +++---
4 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index b3949cd..141a4fb 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -253,3 +253,12 @@ Why: Orphaned for ages. SMP bugs long u
Who: Jeff Garzik <jeff@garzik.org>
---------------------------
+
+What: IPv4 only connection tracking/NAT/helpers
+When: 2.6.22
+Why: The new layer 3 independant connection tracking replaces the old
+ IPv4 only version. After some stabilization of the new code the
+ old one will be removed.
+Who: Patrick McHardy <kaber@trash.net>
+
+---------------------------
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 16390ad..363df99 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -6,7 +6,7 @@ menu "IP: Netfilter Configuration"
depends on INET && NETFILTER
config NF_CONNTRACK_IPV4
- tristate "IPv4 support for new connection tracking (required for NAT) (EXPERIMENTAL)"
+ tristate "IPv4 connection tracking support (required for NAT) (EXPERIMENTAL)"
depends on EXPERIMENTAL && NF_CONNTRACK
---help---
Connection tracking keeps a record of what packets have passed
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index d7c45a9..fc3e5eb 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -6,7 +6,7 @@ menu "IPv6: Netfilter Configuration (EXP
depends on INET && IPV6 && NETFILTER && EXPERIMENTAL
config NF_CONNTRACK_IPV6
- tristate "IPv6 support for new connection tracking (EXPERIMENTAL)"
+ tristate "IPv6 connection tracking support (EXPERIMENTAL)"
depends on EXPERIMENTAL && NF_CONNTRACK
---help---
Connection tracking keeps a record of what packets have passed
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index e0deac1..3a66878 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -56,7 +56,7 @@ config NF_CONNTRACK_SUPPORT
below).
config IP_NF_CONNTRACK_SUPPORT
- bool "Layer 3 Dependent Connection tracking"
+ bool "Layer 3 Dependent Connection tracking (OBSOLETE)"
help
The old, Layer 3 dependent ip_conntrack subsystem of netfilter.
@@ -125,7 +125,7 @@ config NF_CT_PROTO_GRE
depends on EXPERIMENTAL && NF_CONNTRACK
config NF_CT_PROTO_SCTP
- tristate 'SCTP protocol on new connection tracking support (EXPERIMENTAL)'
+ tristate 'SCTP protocol connection tracking support (EXPERIMENTAL)'
depends on EXPERIMENTAL && NF_CONNTRACK
default n
help
@@ -151,7 +151,7 @@ config NF_CONNTRACK_AMANDA
To compile it as a module, choose M here. If unsure, say N.
config NF_CONNTRACK_FTP
- tristate "FTP support on new connection tracking (EXPERIMENTAL)"
+ tristate "FTP protocol support (EXPERIMENTAL)"
depends on EXPERIMENTAL && NF_CONNTRACK
help
Tracking FTP connections is problematic: special helpers are
^ permalink raw reply related [flat|nested] 22+ messages in thread* [NETFILTER 20/20]: nf_conntrack: EXPORT_SYMBOL cleanup
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (17 preceding siblings ...)
2006-12-02 14:50 ` [NETFILTER 19/20]: Mark old IPv4-only connection tracking scheduled for removal Patrick McHardy
@ 2006-12-02 14:50 ` Patrick McHardy
2006-12-03 4:15 ` [NETFILTER 00/20]: Netfilter Update part II Yasuyuki KOZAKAI
2006-12-03 6:16 ` David Miller
20 siblings, 0 replies; 22+ messages in thread
From: Patrick McHardy @ 2006-12-02 14:50 UTC (permalink / raw)
To: davem; +Cc: netfilter-devel, Patrick McHardy
[NETFILTER]: nf_conntrack: EXPORT_SYMBOL cleanup
- move EXPORT_SYMBOL next to exported symbol
- use EXPORT_SYMBOL_GPL since this is what the original code used
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit b0f810003e3469a50a8f3b9977731841cc76cdb4
tree 15342b7f30dfbe409bbf0e41bc05523ec27bc73c
parent 02d2bee5dd7717744d3a6cff529d9a71dc99452e
author Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:27 +0100
committer Patrick McHardy <kaber@trash.net> Sat, 02 Dec 2006 15:34:27 +0100
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c | 7 +-
net/ipv4/netfilter/nf_conntrack_proto_icmp.c | 3 -
net/netfilter/nf_conntrack_core.c | 32 ++++++++++
net/netfilter/nf_conntrack_ecache.c | 6 ++
net/netfilter/nf_conntrack_expect.c | 10 +++
net/netfilter/nf_conntrack_helper.c | 5 ++
net/netfilter/nf_conntrack_proto.c | 12 ++++
net/netfilter/nf_conntrack_proto_tcp.c | 7 +-
net/netfilter/nf_conntrack_proto_udp.c | 5 +-
net/netfilter/nf_conntrack_standalone.c | 74 +-----------------------
10 files changed, 75 insertions(+), 86 deletions(-)
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index 5655109..471b638 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -112,6 +112,8 @@ ipv4_prepare(struct sk_buff **pskb, unsi
}
int nf_nat_module_is_loaded = 0;
+EXPORT_SYMBOL_GPL(nf_nat_module_is_loaded);
+
static u_int32_t ipv4_get_features(const struct nf_conntrack_tuple *tuple)
{
if (nf_nat_module_is_loaded)
@@ -530,8 +532,3 @@ #endif
module_init(nf_conntrack_l3proto_ipv4_init);
module_exit(nf_conntrack_l3proto_ipv4_fini);
-
-EXPORT_SYMBOL(nf_ct_ipv4_gather_frags);
-#ifdef CONFIG_NF_NAT_NEEDED
-EXPORT_SYMBOL(nf_nat_module_is_loaded);
-#endif
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index d25002f..db9e7c4 100644
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -380,5 +380,4 @@ #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
#endif
#endif
};
-
-EXPORT_SYMBOL(nf_conntrack_l4proto_icmp);
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_icmp);
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index ed756c9..93d97d9 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -63,17 +63,27 @@ #define DEBUGP(format, args...)
#endif
DEFINE_RWLOCK(nf_conntrack_lock);
+EXPORT_SYMBOL_GPL(nf_conntrack_lock);
/* nf_conntrack_standalone needs this */
atomic_t nf_conntrack_count = ATOMIC_INIT(0);
EXPORT_SYMBOL_GPL(nf_conntrack_count);
-void (*nf_conntrack_destroyed)(struct nf_conn *conntrack) = NULL;
+void (*nf_conntrack_destroyed)(struct nf_conn *conntrack);
+EXPORT_SYMBOL_GPL(nf_conntrack_destroyed);
+
unsigned int nf_conntrack_htable_size __read_mostly;
+EXPORT_SYMBOL_GPL(nf_conntrack_htable_size);
+
int nf_conntrack_max __read_mostly;
EXPORT_SYMBOL_GPL(nf_conntrack_max);
+
struct list_head *nf_conntrack_hash __read_mostly;
+EXPORT_SYMBOL_GPL(nf_conntrack_hash);
+
struct nf_conn nf_conntrack_untracked __read_mostly;
+EXPORT_SYMBOL_GPL(nf_conntrack_untracked);
+
unsigned int nf_ct_log_invalid __read_mostly;
LIST_HEAD(unconfirmed);
static int nf_conntrack_vmalloc __read_mostly;
@@ -210,6 +220,7 @@ out_up_mutex:
mutex_unlock(&nf_ct_cache_mutex);
return ret;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_register_cache);
/* FIXME: In the current, only nf_conntrack_cleanup() can call this function. */
void nf_conntrack_unregister_cache(u_int32_t features)
@@ -244,6 +255,7 @@ void nf_conntrack_unregister_cache(u_int
mutex_unlock(&nf_ct_cache_mutex);
}
+EXPORT_SYMBOL_GPL(nf_conntrack_unregister_cache);
int
nf_ct_get_tuple(const struct sk_buff *skb,
@@ -266,6 +278,7 @@ nf_ct_get_tuple(const struct sk_buff *sk
return l4proto->pkt_to_tuple(skb, dataoff, tuple);
}
+EXPORT_SYMBOL_GPL(nf_ct_get_tuple);
int
nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
@@ -284,6 +297,7 @@ nf_ct_invert_tuple(struct nf_conntrack_t
inverse->dst.protonum = orig->dst.protonum;
return l4proto->invert_tuple(inverse, orig);
}
+EXPORT_SYMBOL_GPL(nf_ct_invert_tuple);
static void
clean_from_lists(struct nf_conn *ct)
@@ -382,6 +396,7 @@ __nf_conntrack_find(const struct nf_conn
return NULL;
}
+EXPORT_SYMBOL_GPL(__nf_conntrack_find);
/* Find a connection corresponding to a tuple. */
struct nf_conntrack_tuple_hash *
@@ -398,6 +413,7 @@ nf_conntrack_find_get(const struct nf_co
return h;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
static void __nf_conntrack_hash_insert(struct nf_conn *ct,
unsigned int hash,
@@ -421,6 +437,7 @@ void nf_conntrack_hash_insert(struct nf_
__nf_conntrack_hash_insert(ct, hash, repl_hash);
write_unlock_bh(&nf_conntrack_lock);
}
+EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert);
/* Confirm a connection given skb; places it in hash table */
int
@@ -498,6 +515,7 @@ out:
write_unlock_bh(&nf_conntrack_lock);
return NF_DROP;
}
+EXPORT_SYMBOL_GPL(__nf_conntrack_confirm);
/* Returns true if a connection correspondings to the tuple (required
for NAT). */
@@ -513,6 +531,7 @@ nf_conntrack_tuple_taken(const struct nf
return h != NULL;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken);
/* There's a small race here where we may free a just-assured
connection. Too bad: we're in trouble anyway. */
@@ -631,6 +650,7 @@ struct nf_conn *nf_conntrack_alloc(const
l3proto = __nf_ct_l3proto_find(orig->src.l3num);
return __nf_conntrack_alloc(orig, repl, l3proto, 0);
}
+EXPORT_SYMBOL_GPL(nf_conntrack_alloc);
void nf_conntrack_free(struct nf_conn *conntrack)
{
@@ -641,6 +661,7 @@ void nf_conntrack_free(struct nf_conn *c
kmem_cache_free(nf_ct_cache[features].cachep, conntrack);
atomic_dec(&nf_conntrack_count);
}
+EXPORT_SYMBOL_GPL(nf_conntrack_free);
/* Allocate a new conntrack: we return -ENOMEM if classification
failed due to stress. Otherwise it really is unclassifiable. */
@@ -845,6 +866,7 @@ nf_conntrack_in(int pf, unsigned int hoo
return ret;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_in);
int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
const struct nf_conntrack_tuple *orig)
@@ -854,6 +876,7 @@ int nf_ct_invert_tuplepr(struct nf_connt
__nf_ct_l4proto_find(orig->src.l3num,
orig->dst.protonum));
}
+EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr);
/* Alter reply tuple (maybe alter helper). This is for NAT, and is
implicitly racy: see __nf_conntrack_confirm */
@@ -874,6 +897,7 @@ void nf_conntrack_alter_reply(struct nf_
help->helper = __nf_ct_helper_find(newreply);
write_unlock_bh(&nf_conntrack_lock);
}
+EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply);
/* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */
void __nf_ct_refresh_acct(struct nf_conn *ct,
@@ -931,6 +955,7 @@ #endif
if (event)
nf_conntrack_event_cache(event, skb);
}
+EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct);
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
@@ -955,6 +980,7 @@ int nf_ct_port_tuple_to_nfattr(struct sk
nfattr_failure:
return -1;
}
+EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nfattr);
static const size_t cta_min_proto[CTA_PROTO_MAX] = {
[CTA_PROTO_SRC_PORT-1] = sizeof(u_int16_t),
@@ -975,6 +1001,7 @@ int nf_ct_port_nfattr_to_tuple(struct nf
return 0;
}
+EXPORT_SYMBOL_GPL(nf_ct_port_nfattr_to_tuple);
#endif
/* Used by ipt_REJECT and ip6t_REJECT. */
@@ -995,6 +1022,7 @@ void __nf_conntrack_attach(struct sk_buf
nskb->nfctinfo = ctinfo;
nf_conntrack_get(nskb->nfct);
}
+EXPORT_SYMBOL_GPL(__nf_conntrack_attach);
static inline int
do_iter(const struct nf_conntrack_tuple_hash *i,
@@ -1048,6 +1076,7 @@ nf_ct_iterate_cleanup(int (*iter)(struct
nf_ct_put(ct);
}
}
+EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup);
static int kill_all(struct nf_conn *i, void *data)
{
@@ -1067,6 +1096,7 @@ void nf_conntrack_flush()
{
nf_ct_iterate_cleanup(kill_all, NULL);
}
+EXPORT_SYMBOL_GPL(nf_conntrack_flush);
/* Mishearing the voices in his head, our hero wonders how he's
supposed to kill the mall. */
diff --git a/net/netfilter/nf_conntrack_ecache.c b/net/netfilter/nf_conntrack_ecache.c
index 5152efd..d051694 100644
--- a/net/netfilter/nf_conntrack_ecache.c
+++ b/net/netfilter/nf_conntrack_ecache.c
@@ -28,9 +28,13 @@ #include <net/netfilter/nf_conntrack_hel
#include <net/netfilter/nf_conntrack_core.h>
ATOMIC_NOTIFIER_HEAD(nf_conntrack_chain);
+EXPORT_SYMBOL_GPL(nf_conntrack_chain);
+
ATOMIC_NOTIFIER_HEAD(nf_conntrack_expect_chain);
+EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
DEFINE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);
+EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
/* deliver cached events and clear cache entry - must be called with locally
* disabled softirqs */
@@ -59,6 +63,7 @@ void nf_ct_deliver_cached_events(const s
__nf_ct_deliver_cached_events(ecache);
local_bh_enable();
}
+EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
/* Deliver cached events for old pending events, if current conntrack != old */
void __nf_ct_event_cache_init(struct nf_conn *ct)
@@ -74,6 +79,7 @@ void __nf_ct_event_cache_init(struct nf_
ecache->ct = ct;
nf_conntrack_get(&ct->ct_general);
}
+EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
/* flush the event cache - touches other CPU's data and must not be called
* while packets are still passing through the code */
diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index 68623ae..588d379 100644
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -27,6 +27,8 @@ #include <net/netfilter/nf_conntrack_hel
#include <net/netfilter/nf_conntrack_tuple.h>
LIST_HEAD(nf_conntrack_expect_list);
+EXPORT_SYMBOL_GPL(nf_conntrack_expect_list);
+
kmem_cache_t *nf_conntrack_expect_cachep __read_mostly;
static unsigned int nf_conntrack_expect_next_id;
@@ -43,6 +45,7 @@ void nf_ct_unlink_expect(struct nf_connt
master_help->expecting--;
nf_conntrack_expect_put(exp);
}
+EXPORT_SYMBOL_GPL(nf_ct_unlink_expect);
static void expectation_timed_out(unsigned long ul_expect)
{
@@ -65,6 +68,7 @@ __nf_conntrack_expect_find(const struct
}
return NULL;
}
+EXPORT_SYMBOL_GPL(__nf_conntrack_expect_find);
/* Just find a expectation corresponding to a tuple. */
struct nf_conntrack_expect *
@@ -80,6 +84,7 @@ nf_conntrack_expect_find_get(const struc
return i;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_expect_find_get);
/* If an expectation for this connection is found, it gets delete from
* global list then returned. */
@@ -125,6 +130,7 @@ void nf_ct_remove_expectations(struct nf
}
}
}
+EXPORT_SYMBOL_GPL(nf_ct_remove_expectations);
/* Would two expected things clash? */
static inline int expect_clash(const struct nf_conntrack_expect *a,
@@ -179,6 +185,7 @@ void nf_conntrack_unexpect_related(struc
}
write_unlock_bh(&nf_conntrack_lock);
}
+EXPORT_SYMBOL_GPL(nf_conntrack_unexpect_related);
/* We don't increase the master conntrack refcount for non-fulfilled
* conntracks. During the conntrack destruction, the expectations are
@@ -195,6 +202,7 @@ struct nf_conntrack_expect *nf_conntrack
atomic_set(&new->use, 1);
return new;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_expect_alloc);
void nf_conntrack_expect_init(struct nf_conntrack_expect *exp, int family,
union nf_conntrack_address *saddr,
@@ -269,6 +277,7 @@ void nf_conntrack_expect_put(struct nf_c
if (atomic_dec_and_test(&exp->use))
kmem_cache_free(nf_conntrack_expect_cachep, exp);
}
+EXPORT_SYMBOL_GPL(nf_conntrack_expect_put);
static void nf_conntrack_expect_insert(struct nf_conntrack_expect *exp)
{
@@ -351,6 +360,7 @@ out:
write_unlock_bh(&nf_conntrack_lock);
return ret;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_expect_related);
#ifdef CONFIG_PROC_FS
static void *exp_seq_start(struct seq_file *s, loff_t *pos)
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 81542dc..0743be4 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -63,11 +63,13 @@ nf_ct_helper_find_get( const struct nf_c
return helper;
}
+EXPORT_SYMBOL_GPL(nf_ct_helper_find_get);
void nf_ct_helper_put(struct nf_conntrack_helper *helper)
{
module_put(helper->me);
}
+EXPORT_SYMBOL_GPL(nf_ct_helper_put);
struct nf_conntrack_helper *
__nf_conntrack_helper_find_byname(const char *name)
@@ -81,6 +83,7 @@ __nf_conntrack_helper_find_byname(const
return NULL;
}
+EXPORT_SYMBOL_GPL(__nf_conntrack_helper_find_byname);
static inline int unhelp(struct nf_conntrack_tuple_hash *i,
const struct nf_conntrack_helper *me)
@@ -115,6 +118,7 @@ int nf_conntrack_helper_register(struct
return 0;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_helper_register);
void nf_conntrack_helper_unregister(struct nf_conntrack_helper *me)
{
@@ -148,3 +152,4 @@ void nf_conntrack_helper_unregister(stru
/* Someone could be still looking at the helper in a bh. */
synchronize_net();
}
+EXPORT_SYMBOL_GPL(nf_conntrack_helper_unregister);
diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index 4798afc..1a61b72 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -30,6 +30,7 @@ #include <net/netfilter/nf_conntrack_cor
struct nf_conntrack_l4proto **nf_ct_protos[PF_MAX] __read_mostly;
struct nf_conntrack_l3proto *nf_ct_l3protos[AF_MAX] __read_mostly;
+EXPORT_SYMBOL_GPL(nf_ct_l3protos);
#ifdef CONFIG_SYSCTL
static DEFINE_MUTEX(nf_ct_proto_sysctl_mutex);
@@ -67,6 +68,7 @@ __nf_ct_l4proto_find(u_int16_t l3proto,
return nf_ct_protos[l3proto][l4proto];
}
+EXPORT_SYMBOL_GPL(__nf_ct_l4proto_find);
/* this is guaranteed to always return a valid protocol helper, since
* it falls back to generic_protocol */
@@ -83,11 +85,13 @@ nf_ct_l4proto_find_get(u_int16_t l3proto
return p;
}
+EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get);
void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p)
{
module_put(p->me);
}
+EXPORT_SYMBOL_GPL(nf_ct_l4proto_put);
struct nf_conntrack_l3proto *
nf_ct_l3proto_find_get(u_int16_t l3proto)
@@ -102,11 +106,13 @@ nf_ct_l3proto_find_get(u_int16_t l3proto
return p;
}
+EXPORT_SYMBOL_GPL(nf_ct_l3proto_find_get);
void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p)
{
module_put(p->me);
}
+EXPORT_SYMBOL_GPL(nf_ct_l3proto_put);
int
nf_ct_l3proto_try_module_get(unsigned short l3proto)
@@ -125,6 +131,7 @@ retry: p = nf_ct_l3proto_find_get(l3prot
return 0;
}
+EXPORT_SYMBOL_GPL(nf_ct_l3proto_try_module_get);
void nf_ct_l3proto_module_put(unsigned short l3proto)
{
@@ -136,6 +143,7 @@ void nf_ct_l3proto_module_put(unsigned s
module_put(p->me);
}
+EXPORT_SYMBOL_GPL(nf_ct_l3proto_module_put);
static int kill_l3proto(struct nf_conn *i, void *data)
{
@@ -207,6 +215,7 @@ out_unlock:
out:
return ret;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register);
int nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
{
@@ -238,6 +247,7 @@ int nf_conntrack_l3proto_unregister(stru
out:
return ret;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister);
static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto)
{
@@ -359,6 +369,7 @@ out_unlock:
out:
return ret;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_register);
int nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto)
{
@@ -396,3 +407,4 @@ int nf_conntrack_l4proto_unregister(stru
out:
return ret;
}
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_unregister);
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 8156e42..626b001 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -762,7 +762,7 @@ #endif
receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
receiver->td_scale);
}
-
+EXPORT_SYMBOL_GPL(nf_conntrack_tcp_update);
#endif
#define TH_FIN 0x01
@@ -1405,6 +1405,7 @@ #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
#endif
#endif
};
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4);
struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 =
{
@@ -1431,6 +1432,4 @@ #ifdef CONFIG_SYSCTL
.ctl_table = tcp_sysctl_table,
#endif
};
-
-EXPORT_SYMBOL(nf_conntrack_l4proto_tcp4);
-EXPORT_SYMBOL(nf_conntrack_l4proto_tcp6);
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6);
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index 908fde7..e49cd25 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -223,6 +223,7 @@ #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
#endif
#endif
};
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp4);
struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 =
{
@@ -247,6 +248,4 @@ #ifdef CONFIG_SYSCTL
.ctl_table = udp_sysctl_table,
#endif
};
-
-EXPORT_SYMBOL(nf_conntrack_l4proto_udp4);
-EXPORT_SYMBOL(nf_conntrack_l4proto_udp6);
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp6);
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 3f56a3a..f1cb60f 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -329,6 +329,7 @@ #endif /* CONFIG_PROC_FS */
/* Sysctl support */
int nf_conntrack_checksum __read_mostly = 1;
+EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
#ifdef CONFIG_SYSCTL
/* Log invalid packets of a given protocol */
@@ -414,7 +415,7 @@ static ctl_table nf_ct_net_table[] = {
},
{ .ctl_name = 0 }
};
-EXPORT_SYMBOL(nf_ct_log_invalid);
+EXPORT_SYMBOL_GPL(nf_ct_log_invalid);
#endif /* CONFIG_SYSCTL */
static int __init nf_conntrack_standalone_init(void)
@@ -489,73 +490,4 @@ module_exit(nf_conntrack_standalone_fini
void need_conntrack(void)
{
}
-
-#ifdef CONFIG_NF_CONNTRACK_EVENTS
-EXPORT_SYMBOL_GPL(nf_conntrack_chain);
-EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
-EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier);
-EXPORT_SYMBOL_GPL(nf_conntrack_unregister_notifier);
-EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
-EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
-EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
-#endif
-EXPORT_SYMBOL(nf_ct_l3proto_try_module_get);
-EXPORT_SYMBOL(nf_ct_l3proto_module_put);
-EXPORT_SYMBOL(nf_conntrack_l3proto_register);
-EXPORT_SYMBOL(nf_conntrack_l3proto_unregister);
-EXPORT_SYMBOL(nf_conntrack_l4proto_register);
-EXPORT_SYMBOL(nf_conntrack_l4proto_unregister);
-EXPORT_SYMBOL(nf_ct_invert_tuplepr);
-EXPORT_SYMBOL(nf_conntrack_destroyed);
-EXPORT_SYMBOL(need_conntrack);
-EXPORT_SYMBOL(nf_conntrack_helper_register);
-EXPORT_SYMBOL(nf_conntrack_helper_unregister);
-EXPORT_SYMBOL(nf_ct_iterate_cleanup);
-EXPORT_SYMBOL(__nf_ct_refresh_acct);
-EXPORT_SYMBOL(nf_ct_protos);
-EXPORT_SYMBOL(__nf_ct_l4proto_find);
-EXPORT_SYMBOL(nf_ct_l4proto_find_get);
-EXPORT_SYMBOL(nf_ct_l4proto_put);
-EXPORT_SYMBOL(nf_ct_l3proto_find_get);
-EXPORT_SYMBOL(nf_ct_l3proto_put);
-EXPORT_SYMBOL(nf_ct_l3protos);
-EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
-EXPORT_SYMBOL(nf_conntrack_expect_alloc);
-EXPORT_SYMBOL(nf_conntrack_expect_put);
-EXPORT_SYMBOL(nf_conntrack_expect_related);
-EXPORT_SYMBOL(nf_conntrack_unexpect_related);
-EXPORT_SYMBOL(nf_conntrack_tuple_taken);
-EXPORT_SYMBOL(nf_conntrack_htable_size);
-EXPORT_SYMBOL(nf_conntrack_lock);
-EXPORT_SYMBOL(nf_conntrack_hash);
-EXPORT_SYMBOL(nf_conntrack_untracked);
-EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
-#ifdef CONFIG_NF_NAT_NEEDED
-EXPORT_SYMBOL(nf_conntrack_tcp_update);
-EXPORT_SYMBOL(nf_conntrack_register_cache);
-EXPORT_SYMBOL(nf_conntrack_unregister_cache);
-EXPORT_SYMBOL(nf_conntrack_alter_reply);
-#endif
-EXPORT_SYMBOL(__nf_conntrack_confirm);
-EXPORT_SYMBOL(nf_ct_get_tuple);
-EXPORT_SYMBOL(nf_ct_invert_tuple);
-EXPORT_SYMBOL(nf_conntrack_in);
-EXPORT_SYMBOL(__nf_conntrack_attach);
-EXPORT_SYMBOL(nf_conntrack_alloc);
-EXPORT_SYMBOL(nf_conntrack_free);
-EXPORT_SYMBOL(nf_conntrack_flush);
-EXPORT_SYMBOL(nf_ct_remove_expectations);
-EXPORT_SYMBOL(nf_ct_helper_find_get);
-EXPORT_SYMBOL(nf_ct_helper_put);
-EXPORT_SYMBOL(__nf_conntrack_helper_find_byname);
-EXPORT_SYMBOL(__nf_conntrack_find);
-EXPORT_SYMBOL(nf_ct_unlink_expect);
-EXPORT_SYMBOL(nf_conntrack_hash_insert);
-EXPORT_SYMBOL(__nf_conntrack_expect_find);
-EXPORT_SYMBOL(nf_conntrack_expect_find_get);
-EXPORT_SYMBOL(nf_conntrack_expect_list);
-#if defined(CONFIG_NF_CT_NETLINK) || \
- defined(CONFIG_NF_CT_NETLINK_MODULE)
-EXPORT_SYMBOL(nf_ct_port_tuple_to_nfattr);
-EXPORT_SYMBOL(nf_ct_port_nfattr_to_tuple);
-#endif
+EXPORT_SYMBOL_GPL(need_conntrack);
^ permalink raw reply related [flat|nested] 22+ messages in thread* Re: [NETFILTER 00/20]: Netfilter Update part II
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (18 preceding siblings ...)
2006-12-02 14:50 ` [NETFILTER 20/20]: nf_conntrack: EXPORT_SYMBOL cleanup Patrick McHardy
@ 2006-12-03 4:15 ` Yasuyuki KOZAKAI
2006-12-03 6:16 ` David Miller
20 siblings, 0 replies; 22+ messages in thread
From: Yasuyuki KOZAKAI @ 2006-12-03 4:15 UTC (permalink / raw)
To: kaber; +Cc: netfilter-devel, davem
Hi, Patrick,
From: Patrick McHardy <kaber@trash.net>
Date: Sat, 2 Dec 2006 15:49:36 +0100 (MET)
> Hi Dave,
>
> following is part two of my netfilter update for 2.6.20, containing
> NAT support for nf_conntrack and ports of all conntrack/NAT helpers.
> With these patches nf_conntrack is finally a full replacement for
> ip_conntrack, which is now scheduled for removal in 2.6.22 after some
> stabilization of the new code.
>
> You can also pull these patches from
> http://people.netfilter.org/~kaber/nf-2.6.20-nat.git
I've tested some kconfig combinations. Some helpers seem to need
netfilter.h for NF_{ACCEPT,DROP}, in the case that IPv4 NAT is disabled.
And ecache includes some unnecessary headers.
-- Yasuyuki Kozakai
>From 0e329162380f9f7342bff139087e1964dcb94bbc Mon Sep 17 00:00:00 2001
From: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Date: Sun, 3 Dec 2006 06:41:20 +0900
Subject: [NETFILTER]: nf_conntrack: fix header inclusions for helpers
Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
---
net/netfilter/nf_conntrack_amanda.c | 1 +
net/netfilter/nf_conntrack_ecache.c | 4 ----
net/netfilter/nf_conntrack_netbios_ns.c | 1 +
net/netfilter/nf_conntrack_sip.c | 1 +
net/netfilter/nf_conntrack_tftp.c | 1 +
5 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/net/netfilter/nf_conntrack_amanda.c b/net/netfilter/nf_conntrack_amanda.c
index 5c495dc..b8869ea 100644
--- a/net/netfilter/nf_conntrack_amanda.c
+++ b/net/netfilter/nf_conntrack_amanda.c
@@ -15,6 +15,7 @@
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/udp.h>
+#include <linux/netfilter.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_expect.h>
diff --git a/net/netfilter/nf_conntrack_ecache.c b/net/netfilter/nf_conntrack_ecache.c
index d051694..1a223e0 100644
--- a/net/netfilter/nf_conntrack_ecache.c
+++ b/net/netfilter/nf_conntrack_ecache.c
@@ -21,10 +21,6 @@
#include <linux/netdevice.h>
#include <net/netfilter/nf_conntrack.h>
-#include <net/netfilter/nf_conntrack_l3proto.h>
-#include <net/netfilter/nf_conntrack_l4proto.h>
-#include <net/netfilter/nf_conntrack_expect.h>
-#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_core.h>
ATOMIC_NOTIFIER_HEAD(nf_conntrack_chain);
diff --git a/net/netfilter/nf_conntrack_netbios_ns.c b/net/netfilter/nf_conntrack_netbios_ns.c
index 4fad3ad..a5b234e 100644
--- a/net/netfilter/nf_conntrack_netbios_ns.c
+++ b/net/netfilter/nf_conntrack_netbios_ns.c
@@ -24,6 +24,7 @@
#include <linux/if_addr.h>
#include <linux/in.h>
#include <linux/ip.h>
+#include <linux/netfilter.h>
#include <net/route.h>
#include <net/netfilter/nf_conntrack.h>
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index e0c0679..eb2a241 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -14,6 +14,7 @@
#include <linux/inet.h>
#include <linux/in.h>
#include <linux/udp.h>
+#include <linux/netfilter.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_expect.h>
diff --git a/net/netfilter/nf_conntrack_tftp.c b/net/netfilter/nf_conntrack_tftp.c
index d46a126..f5bffe2 100644
--- a/net/netfilter/nf_conntrack_tftp.c
+++ b/net/netfilter/nf_conntrack_tftp.c
@@ -9,6 +9,7 @@
#include <linux/moduleparam.h>
#include <linux/in.h>
#include <linux/udp.h>
+#include <linux/netfilter.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_tuple.h>
--
1.4.4
^ permalink raw reply related [flat|nested] 22+ messages in thread* Re: [NETFILTER 00/20]: Netfilter Update part II
2006-12-02 14:49 [NETFILTER 00/20]: Netfilter Update part II Patrick McHardy
` (19 preceding siblings ...)
2006-12-03 4:15 ` [NETFILTER 00/20]: Netfilter Update part II Yasuyuki KOZAKAI
@ 2006-12-03 6:16 ` David Miller
20 siblings, 0 replies; 22+ messages in thread
From: David Miller @ 2006-12-03 6:16 UTC (permalink / raw)
To: kaber; +Cc: netfilter-devel, yasuyuki.kozakai
From: Patrick McHardy <kaber@trash.net>
Date: Sat, 2 Dec 2006 15:49:36 +0100 (MET)
> following is part two of my netfilter update for 2.6.20, containing
> NAT support for nf_conntrack and ports of all conntrack/NAT helpers.
> With these patches nf_conntrack is finally a full replacement for
> ip_conntrack, which is now scheduled for removal in 2.6.22 after some
> stabilization of the new code.
I've rebased my tree and applied all 20 patches, thanks a lot!
Also, since I wanted to try to push this work to Linus tonight
I applied Yasuyuki-san's header include fix as well.
Thanks again. I'm very happy this work got completed in time
for 2.6.20
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