* [RFC PATCH 1/2] netfilter: refactor xt_TEE code
@ 2015-02-11 18:39 Arturo Borrero Gonzalez
2015-02-11 18:39 ` [RFC PATCH 2/2] netfilter: nf_tables: add nft_tee expression Arturo Borrero Gonzalez
0 siblings, 1 reply; 2+ messages in thread
From: Arturo Borrero Gonzalez @ 2015-02-11 18:39 UTC (permalink / raw)
To: netfilter-devel; +Cc: kaber, pablo
Refactor xt_TEE code so it can be used outside of the xtables
context (nf_tables).
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
---
include/net/netfilter/ipv4/nf_tee_ipv4.h | 8 +
include/net/netfilter/ipv6/nf_tee_ipv6.h | 8 +
include/net/netfilter/nf_tee.h | 20 +++
net/ipv4/netfilter/Kconfig | 8 +
net/ipv4/netfilter/Makefile | 2
net/ipv4/netfilter/nf_tee_ipv4.c | 115 +++++++++++++++
net/ipv6/netfilter/Kconfig | 8 +
net/ipv6/netfilter/Makefile | 2
net/ipv6/netfilter/nf_tee_ipv6.c | 89 ++++++++++++
net/netfilter/Kconfig | 8 +
net/netfilter/Makefile | 2
net/netfilter/nf_tee.c | 115 +++++++++++++++
net/netfilter/xt_TEE.c | 232 ++----------------------------
13 files changed, 400 insertions(+), 217 deletions(-)
create mode 100644 include/net/netfilter/ipv4/nf_tee_ipv4.h
create mode 100644 include/net/netfilter/ipv6/nf_tee_ipv6.h
create mode 100644 include/net/netfilter/nf_tee.h
create mode 100644 net/ipv4/netfilter/nf_tee_ipv4.c
create mode 100644 net/ipv6/netfilter/nf_tee_ipv6.c
create mode 100644 net/netfilter/nf_tee.c
diff --git a/include/net/netfilter/ipv4/nf_tee_ipv4.h b/include/net/netfilter/ipv4/nf_tee_ipv4.h
new file mode 100644
index 0000000..202ad75
--- /dev/null
+++ b/include/net/netfilter/ipv4/nf_tee_ipv4.h
@@ -0,0 +1,8 @@
+#ifndef _NF_TEE_IPV4_H_
+#define _NF_TEE_IPV4_H_
+
+#include <net/netfilter/nf_tee.h>
+
+unsigned int nf_tee_ipv4(struct sk_buff *skb, const struct nf_tee *tee);
+
+#endif /* _NF_TEE_IPV4_H_ */
diff --git a/include/net/netfilter/ipv6/nf_tee_ipv6.h b/include/net/netfilter/ipv6/nf_tee_ipv6.h
new file mode 100644
index 0000000..fe4c5a1
--- /dev/null
+++ b/include/net/netfilter/ipv6/nf_tee_ipv6.h
@@ -0,0 +1,8 @@
+#ifndef _NF_TEE_IPV6_H_
+#define _NF_TEE_IPV6_H_
+
+#include <net/netfilter/nf_tee.h>
+
+unsigned int nf_tee_ipv6(struct sk_buff *skb, const struct nf_tee *tee);
+
+#endif /* _NF_TEE_IPV6_H_ */
diff --git a/include/net/netfilter/nf_tee.h b/include/net/netfilter/nf_tee.h
new file mode 100644
index 0000000..2bd6d56
--- /dev/null
+++ b/include/net/netfilter/nf_tee.h
@@ -0,0 +1,20 @@
+#ifndef _NF_TEE_H_
+#define _NF_TEE_H_
+
+#include <linux/netfilter.h>
+#include <linux/if.h>
+
+struct nf_tee {
+ union nf_inet_addr gw;
+ char oif_str[IFNAMSIZ];
+ int oif;
+ unsigned int hooknum;
+ struct notifier_block notifier;
+};
+
+struct net *nf_tee_pick_net(struct sk_buff *skb);
+struct nf_tee *nf_tee_new(union nf_inet_addr gw, const char *oif_str);
+bool nf_tee_has_notifier(const struct nf_tee *tee);
+void nf_tee_destroy(struct nf_tee *tee);
+
+#endif
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 59f883d..d71dbdf 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -36,6 +36,14 @@ config NF_CONNTRACK_PROC_COMPAT
If unsure, say Y.
+config NF_TEE_IPV4
+ tristate "Netfilter IPv4 packet cloning to alternate destination"
+ depends on !NF_CONNTRACK || NF_CONNTRACK
+ depends on NF_TEE
+ help
+ This optiones enables the nf_tee_ipv4 engine, which can clone a
+ packet and this clone be rerouted to another nexthop.
+
config NF_LOG_ARP
tristate "ARP packet logging"
default m if NETFILTER_ADVANCED=n
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 7fe6c70..6b492de 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -70,3 +70,5 @@ obj-$(CONFIG_IP_NF_ARP_MANGLE) += arpt_mangle.o
# just filtering instance of ARP tables for now
obj-$(CONFIG_IP_NF_ARPFILTER) += arptable_filter.o
+
+obj-$(CONFIG_NF_TEE_IPV4) += nf_tee_ipv4.o
diff --git a/net/ipv4/netfilter/nf_tee_ipv4.c b/net/ipv4/netfilter/nf_tee_ipv4.c
new file mode 100644
index 0000000..5fe94b2
--- /dev/null
+++ b/net/ipv4/netfilter/nf_tee_ipv4.c
@@ -0,0 +1,115 @@
+/*
+ * "TEE" target extension for Xtables
+ * Copyright © Sebastian Claßen, 2007
+ * Jan Engelhardt, 2007-2010
+ *
+ * based on ipt_ROUTE.c from Cédric de Launois
+ * <delaunois@info.ucl.be>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 or later, as published by the Free Software Foundation.
+ */
+#include <linux/ip.h>
+#include <linux/module.h>
+#include <linux/percpu.h>
+#include <linux/route.h>
+#include <linux/skbuff.h>
+#include <net/checksum.h>
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/route.h>
+#include <net/netfilter/nf_tee.h>
+#include <net/netfilter/ipv4/nf_tee_ipv4.h>
+
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+# define WITH_CONNTRACK 1
+# include <net/netfilter/nf_conntrack.h>
+#endif
+
+static DEFINE_PER_CPU(bool, tee_active);
+
+static bool nf_tee_ipv4_route(struct sk_buff *skb, const struct nf_tee *tee)
+{
+ const struct iphdr *iph = ip_hdr(skb);
+ struct net *net = nf_tee_pick_net(skb);
+ struct rtable *rt;
+ struct flowi4 fl4;
+
+ memset(&fl4, 0, sizeof(fl4));
+ if (nf_tee_has_notifier(tee)) {
+ if (tee->oif == -1)
+ return false;
+
+ fl4.flowi4_oif = tee->oif;
+ }
+ fl4.daddr = tee->gw.ip;
+ fl4.flowi4_tos = RT_TOS(iph->tos);
+ fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
+ fl4.flowi4_flags = FLOWI_FLAG_KNOWN_NH;
+ rt = ip_route_output_key(net, &fl4);
+ if (IS_ERR(rt))
+ return false;
+
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &rt->dst);
+ skb->dev = rt->dst.dev;
+ skb->protocol = htons(ETH_P_IP);
+ return true;
+}
+
+unsigned int nf_tee_ipv4(struct sk_buff *skb, const struct nf_tee *tee)
+{
+ struct iphdr *iph;
+
+ if (__this_cpu_read(tee_active))
+ return XT_CONTINUE;
+ /*
+ * Copy the skb, and route the copy. Will later return %XT_CONTINUE for
+ * the original skb, which should continue on its way as if nothing has
+ * happened. The copy should be independently delivered to the TEE
+ * --gateway.
+ */
+ skb = pskb_copy(skb, GFP_ATOMIC);
+ if (skb == NULL)
+ return XT_CONTINUE;
+
+#ifdef WITH_CONNTRACK
+ /* Avoid counting cloned packets towards the original connection. */
+ nf_conntrack_put(skb->nfct);
+ skb->nfct = &nf_ct_untracked_get()->ct_general;
+ skb->nfctinfo = IP_CT_NEW;
+ nf_conntrack_get(skb->nfct);
+#endif
+ /*
+ * If we are in PREROUTING/INPUT, the checksum must be recalculated
+ * since the length could have changed as a result of defragmentation.
+ *
+ * We also decrease the TTL to mitigate potential TEE loops
+ * between two hosts.
+ *
+ * Set %IP_DF so that the original source is notified of a potentially
+ * decreased MTU on the clone route. IPv6 does this too.
+ */
+ iph = ip_hdr(skb);
+ iph->frag_off |= htons(IP_DF);
+ if (tee->hooknum == NF_INET_PRE_ROUTING ||
+ tee->hooknum == NF_INET_LOCAL_IN)
+ --iph->ttl;
+ ip_send_check(iph);
+
+ if (nf_tee_ipv4_route(skb, tee)) {
+ __this_cpu_write(tee_active, true);
+ ip_local_out(skb);
+ __this_cpu_write(tee_active, false);
+ } else {
+ kfree_skb(skb);
+ }
+ return XT_CONTINUE;
+}
+EXPORT_SYMBOL_GPL(nf_tee_ipv4);
+
+MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>");
+MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
+MODULE_DESCRIPTION("nf_tee_ipv4: Reroute IPv4 packet copy");
+MODULE_LICENSE("GPL");
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index a069822..fefd1bb 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -55,6 +55,14 @@ config NF_LOG_IPV6
default m if NETFILTER_ADVANCED=n
select NF_LOG_COMMON
+config NF_TEE_IPV6
+ tristate "Netfilter IPv6 packet cloning to alternate destination"
+ depends on !NF_CONNTRACK || NF_CONNTRACK
+ depends on NF_TEE
+ help
+ This optiones enables the nf_tee_ipv6 engine, which can clone a
+ packet and this clone be rerouted to another nexthop.
+
config NF_NAT_IPV6
tristate "IPv6 NAT"
depends on NF_CONNTRACK_IPV6
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index c36e0a5..b3a2946 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -30,6 +30,8 @@ obj-$(CONFIG_NF_LOG_IPV6) += nf_log_ipv6.o
# reject
obj-$(CONFIG_NF_REJECT_IPV6) += nf_reject_ipv6.o
+obj-$(CONFIG_NF_TEE_IPV6) += nf_tee_ipv6.o
+
# nf_tables
obj-$(CONFIG_NF_TABLES_IPV6) += nf_tables_ipv6.o
obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV6) += nft_chain_route_ipv6.o
diff --git a/net/ipv6/netfilter/nf_tee_ipv6.c b/net/ipv6/netfilter/nf_tee_ipv6.c
new file mode 100644
index 0000000..4b95cdd
--- /dev/null
+++ b/net/ipv6/netfilter/nf_tee_ipv6.c
@@ -0,0 +1,89 @@
+/*
+ * "TEE" target extension for Xtables
+ * Copyright © Sebastian Claßen, 2007
+ * Jan Engelhardt, 2007-2010
+ *
+ * based on ipt_ROUTE.c from Cédric de Launois
+ * <delaunois@info.ucl.be>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 or later, as published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/percpu.h>
+#include <linux/skbuff.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/netfilter/nf_tee.h>
+#include <net/netfilter/ipv6/nf_tee_ipv6.h>
+
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+# define WITH_CONNTRACK 1
+# include <net/netfilter/nf_conntrack.h>
+#endif
+
+static DEFINE_PER_CPU(bool, tee_active);
+
+static bool nf_tee_ipv6_route(struct sk_buff *skb, const struct nf_tee *tee)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct net *net = nf_tee_pick_net(skb);
+ struct dst_entry *dst;
+ struct flowi6 fl6;
+
+ memset(&fl6, 0, sizeof(fl6));
+ if (nf_tee_has_notifier(tee)) {
+ if (tee->oif == -1)
+ return false;
+ fl6.flowi6_oif = tee->oif;
+ }
+ fl6.daddr = tee->gw.in6;
+ fl6.flowlabel = ((iph->flow_lbl[0] & 0xF) << 16) |
+ (iph->flow_lbl[1] << 8) | iph->flow_lbl[2];
+ dst = ip6_route_output(net, NULL, &fl6);
+ if (dst->error) {
+ dst_release(dst);
+ return false;
+ }
+ skb_dst_drop(skb);
+ skb_dst_set(skb, dst);
+ skb->dev = dst->dev;
+ skb->protocol = htons(ETH_P_IPV6);
+ return true;
+}
+
+unsigned int nf_tee_ipv6(struct sk_buff *skb, const struct nf_tee *tee)
+{
+ if (__this_cpu_read(tee_active))
+ return XT_CONTINUE;
+ skb = pskb_copy(skb, GFP_ATOMIC);
+ if (skb == NULL)
+ return XT_CONTINUE;
+
+#ifdef WITH_CONNTRACK
+ nf_conntrack_put(skb->nfct);
+ skb->nfct = &nf_ct_untracked_get()->ct_general;
+ skb->nfctinfo = IP_CT_NEW;
+ nf_conntrack_get(skb->nfct);
+#endif
+ if (tee->hooknum == NF_INET_PRE_ROUTING ||
+ tee->hooknum == NF_INET_LOCAL_IN) {
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+ --iph->hop_limit;
+ }
+ if (nf_tee_ipv6_route(skb, tee)) {
+ __this_cpu_write(tee_active, true);
+ ip6_local_out(skb);
+ __this_cpu_write(tee_active, false);
+ } else {
+ kfree_skb(skb);
+ }
+ return XT_CONTINUE;
+}
+EXPORT_SYMBOL_GPL(nf_tee_ipv6);
+
+MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>");
+MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
+MODULE_DESCRIPTION("nf_tee_ipv6: Reroute IPv6 packet copy");
+MODULE_LICENSE("GPL");
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index b02660f..f0a0712 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -562,6 +562,13 @@ config NFT_COMPAT
x_tables match/target extensions over the nf_tables
framework.
+config NF_TEE
+ tristate "Netfilter nf_tee module"
+ help
+ This module is the core nf_tee engine, which allows you
+ to copy and redirect packets to another gateway.
+
+
config NETFILTER_XTABLES
tristate "Netfilter Xtables support (required for ip_tables)"
default m if NETFILTER_ADVANCED=n
@@ -863,6 +870,7 @@ config NETFILTER_XT_TARGET_REDIRECT
config NETFILTER_XT_TARGET_TEE
tristate '"TEE" - packet cloning to alternate destination'
depends on NETFILTER_ADVANCED
+ depends on NF_TEE_IPV4 || NF_TEE_IPV6
depends on (IPV6 || IPV6=n)
depends on !NF_CONNTRACK || NF_CONNTRACK
---help---
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 89f73a9..0cd2f03 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -47,6 +47,8 @@ obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o
nf_nat-y := nf_nat_core.o nf_nat_proto_unknown.o nf_nat_proto_common.o \
nf_nat_proto_udp.o nf_nat_proto_tcp.o nf_nat_helper.o
+obj-$(CONFIG_NF_TEE) += nf_tee.o
+
# generic transport layer logging
obj-$(CONFIG_NF_LOG_COMMON) += nf_log_common.o
diff --git a/net/netfilter/nf_tee.c b/net/netfilter/nf_tee.c
new file mode 100644
index 0000000..4560ecc
--- /dev/null
+++ b/net/netfilter/nf_tee.c
@@ -0,0 +1,115 @@
+/*
+ * "TEE" target extension for Xtables
+ * Copyright © Sebastian Claßen, 2007
+ * Jan Engelhardt, 2007-2010
+ *
+ * based on ipt_ROUTE.c from Cédric de Launois
+ * <delaunois@info.ucl.be>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 or later, as published by the Free Software Foundation.
+ */
+
+#include <linux/ip.h>
+#include <linux/module.h>
+#include <linux/percpu.h>
+#include <linux/skbuff.h>
+#include <linux/notifier.h>
+#include <linux/netdevice.h>
+#include <net/net_namespace.h>
+#include <net/dst.h>
+#include <net/netfilter/nf_tee.h>
+
+struct net *nf_tee_pick_net(struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_NS
+ const struct dst_entry *dst;
+
+ if (skb->dev != NULL)
+ return dev_net(skb->dev);
+ dst = skb_dst(skb);
+ if (dst != NULL && dst->dev != NULL)
+ return dev_net(dst->dev);
+#endif
+ return &init_net;
+}
+EXPORT_SYMBOL_GPL(nf_tee_pick_net);
+
+static int
+nf_tee_netdev_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct nf_tee *tee;
+
+ tee = container_of(this, struct nf_tee, notifier);
+ switch (event) {
+ case NETDEV_REGISTER:
+ if (!strcmp(dev->name, tee->oif_str))
+ tee->oif = dev->ifindex;
+ break;
+ case NETDEV_UNREGISTER:
+ if (dev->ifindex == tee->oif)
+ tee->oif = -1;
+ break;
+ case NETDEV_CHANGENAME:
+ if (!strcmp(dev->name, tee->oif_str))
+ tee->oif = dev->ifindex;
+ else if (dev->ifindex == tee->oif)
+ tee->oif = -1;
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static const union nf_inet_addr tee_zero_address;
+
+struct nf_tee *nf_tee_new(union nf_inet_addr gw, const char *oif_str)
+{
+ struct nf_tee *tee;
+
+ /* 0.0.0.0 and :: not allowed */
+ if (memcmp(&gw, &tee_zero_address,
+ sizeof(tee_zero_address)) == 0)
+ return ERR_PTR(-EINVAL);
+
+ tee = kzalloc(sizeof(struct nf_tee), GFP_KERNEL);
+ if (tee == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ if (oif_str && oif_str[0]) {
+ if (oif_str[sizeof(tee->oif_str) - 1] != '\0')
+ return ERR_PTR(-EINVAL);
+
+ memcpy(tee->oif_str, oif_str, sizeof(tee->oif_str));
+ tee->oif = -1;
+ tee->notifier.notifier_call = nf_tee_netdev_event;
+ register_netdevice_notifier(&tee->notifier);
+ }
+
+ tee->gw = gw;
+ return tee;
+}
+EXPORT_SYMBOL_GPL(nf_tee_new);
+
+bool nf_tee_has_notifier(const struct nf_tee *tee)
+{
+ return (tee->notifier.notifier_call == nf_tee_netdev_event);
+}
+EXPORT_SYMBOL_GPL(nf_tee_has_notifier);
+
+void nf_tee_destroy(struct nf_tee *tee)
+{
+ if (nf_tee_has_notifier(tee))
+ unregister_netdevice_notifier(&tee->notifier);
+
+ kfree(tee);
+}
+EXPORT_SYMBOL_GPL(nf_tee_destroy);
+
+MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>");
+MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
+MODULE_DESCRIPTION("nf_tee: Reroute packet copy");
+MODULE_LICENSE("GPL");
diff --git a/net/netfilter/xt_TEE.c b/net/netfilter/xt_TEE.c
index 292934d..98bde0f 100644
--- a/net/netfilter/xt_TEE.c
+++ b/net/netfilter/xt_TEE.c
@@ -10,247 +10,48 @@
* modify it under the terms of the GNU General Public License
* version 2 or later, as published by the Free Software Foundation.
*/
-#include <linux/ip.h>
#include <linux/module.h>
-#include <linux/percpu.h>
-#include <linux/route.h>
#include <linux/skbuff.h>
-#include <linux/notifier.h>
-#include <net/checksum.h>
-#include <net/icmp.h>
-#include <net/ip.h>
-#include <net/ipv6.h>
-#include <net/ip6_route.h>
-#include <net/route.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_TEE.h>
-
-#if IS_ENABLED(CONFIG_NF_CONNTRACK)
-# define WITH_CONNTRACK 1
-# include <net/netfilter/nf_conntrack.h>
-#endif
-
-struct xt_tee_priv {
- struct notifier_block notifier;
- struct xt_tee_tginfo *tginfo;
- int oif;
-};
-
-static const union nf_inet_addr tee_zero_address;
-static DEFINE_PER_CPU(bool, tee_active);
-
-static struct net *pick_net(struct sk_buff *skb)
-{
-#ifdef CONFIG_NET_NS
- const struct dst_entry *dst;
-
- if (skb->dev != NULL)
- return dev_net(skb->dev);
- dst = skb_dst(skb);
- if (dst != NULL && dst->dev != NULL)
- return dev_net(dst->dev);
-#endif
- return &init_net;
-}
-
-static bool
-tee_tg_route4(struct sk_buff *skb, const struct xt_tee_tginfo *info)
-{
- const struct iphdr *iph = ip_hdr(skb);
- struct net *net = pick_net(skb);
- struct rtable *rt;
- struct flowi4 fl4;
-
- memset(&fl4, 0, sizeof(fl4));
- if (info->priv) {
- if (info->priv->oif == -1)
- return false;
- fl4.flowi4_oif = info->priv->oif;
- }
- fl4.daddr = info->gw.ip;
- fl4.flowi4_tos = RT_TOS(iph->tos);
- fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
- fl4.flowi4_flags = FLOWI_FLAG_KNOWN_NH;
- rt = ip_route_output_key(net, &fl4);
- if (IS_ERR(rt))
- return false;
-
- skb_dst_drop(skb);
- skb_dst_set(skb, &rt->dst);
- skb->dev = rt->dst.dev;
- skb->protocol = htons(ETH_P_IP);
- return true;
-}
+#include <net/netfilter/nf_tee.h>
+#include <net/netfilter/ipv4/nf_tee_ipv4.h>
+#include <net/netfilter/ipv6/nf_tee_ipv6.h>
static unsigned int
tee_tg4(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct xt_tee_tginfo *info = par->targinfo;
- struct iphdr *iph;
+ struct nf_tee *tee = (struct nf_tee *)info->priv;
- if (__this_cpu_read(tee_active))
- return XT_CONTINUE;
- /*
- * Copy the skb, and route the copy. Will later return %XT_CONTINUE for
- * the original skb, which should continue on its way as if nothing has
- * happened. The copy should be independently delivered to the TEE
- * --gateway.
- */
- skb = pskb_copy(skb, GFP_ATOMIC);
- if (skb == NULL)
- return XT_CONTINUE;
+ tee->hooknum = par->hooknum;
-#ifdef WITH_CONNTRACK
- /* Avoid counting cloned packets towards the original connection. */
- nf_conntrack_put(skb->nfct);
- skb->nfct = &nf_ct_untracked_get()->ct_general;
- skb->nfctinfo = IP_CT_NEW;
- nf_conntrack_get(skb->nfct);
-#endif
- /*
- * If we are in PREROUTING/INPUT, the checksum must be recalculated
- * since the length could have changed as a result of defragmentation.
- *
- * We also decrease the TTL to mitigate potential TEE loops
- * between two hosts.
- *
- * Set %IP_DF so that the original source is notified of a potentially
- * decreased MTU on the clone route. IPv6 does this too.
- */
- iph = ip_hdr(skb);
- iph->frag_off |= htons(IP_DF);
- if (par->hooknum == NF_INET_PRE_ROUTING ||
- par->hooknum == NF_INET_LOCAL_IN)
- --iph->ttl;
- ip_send_check(iph);
-
- if (tee_tg_route4(skb, info)) {
- __this_cpu_write(tee_active, true);
- ip_local_out(skb);
- __this_cpu_write(tee_active, false);
- } else {
- kfree_skb(skb);
- }
- return XT_CONTINUE;
+ return nf_tee_ipv4(skb, tee);
}
#if IS_ENABLED(CONFIG_IPV6)
-static bool
-tee_tg_route6(struct sk_buff *skb, const struct xt_tee_tginfo *info)
-{
- const struct ipv6hdr *iph = ipv6_hdr(skb);
- struct net *net = pick_net(skb);
- struct dst_entry *dst;
- struct flowi6 fl6;
-
- memset(&fl6, 0, sizeof(fl6));
- if (info->priv) {
- if (info->priv->oif == -1)
- return false;
- fl6.flowi6_oif = info->priv->oif;
- }
- fl6.daddr = info->gw.in6;
- fl6.flowlabel = ((iph->flow_lbl[0] & 0xF) << 16) |
- (iph->flow_lbl[1] << 8) | iph->flow_lbl[2];
- dst = ip6_route_output(net, NULL, &fl6);
- if (dst->error) {
- dst_release(dst);
- return false;
- }
- skb_dst_drop(skb);
- skb_dst_set(skb, dst);
- skb->dev = dst->dev;
- skb->protocol = htons(ETH_P_IPV6);
- return true;
-}
-
static unsigned int
tee_tg6(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct xt_tee_tginfo *info = par->targinfo;
+ struct nf_tee *tee = (struct nf_tee *)info->priv;
- if (__this_cpu_read(tee_active))
- return XT_CONTINUE;
- skb = pskb_copy(skb, GFP_ATOMIC);
- if (skb == NULL)
- return XT_CONTINUE;
+ tee->hooknum = par->hooknum;
-#ifdef WITH_CONNTRACK
- nf_conntrack_put(skb->nfct);
- skb->nfct = &nf_ct_untracked_get()->ct_general;
- skb->nfctinfo = IP_CT_NEW;
- nf_conntrack_get(skb->nfct);
-#endif
- if (par->hooknum == NF_INET_PRE_ROUTING ||
- par->hooknum == NF_INET_LOCAL_IN) {
- struct ipv6hdr *iph = ipv6_hdr(skb);
- --iph->hop_limit;
- }
- if (tee_tg_route6(skb, info)) {
- __this_cpu_write(tee_active, true);
- ip6_local_out(skb);
- __this_cpu_write(tee_active, false);
- } else {
- kfree_skb(skb);
- }
- return XT_CONTINUE;
+ return nf_tee_ipv6(skb, tee);
}
#endif
-static int tee_netdev_event(struct notifier_block *this, unsigned long event,
- void *ptr)
-{
- struct net_device *dev = netdev_notifier_info_to_dev(ptr);
- struct xt_tee_priv *priv;
-
- priv = container_of(this, struct xt_tee_priv, notifier);
- switch (event) {
- case NETDEV_REGISTER:
- if (!strcmp(dev->name, priv->tginfo->oif))
- priv->oif = dev->ifindex;
- break;
- case NETDEV_UNREGISTER:
- if (dev->ifindex == priv->oif)
- priv->oif = -1;
- break;
- case NETDEV_CHANGENAME:
- if (!strcmp(dev->name, priv->tginfo->oif))
- priv->oif = dev->ifindex;
- else if (dev->ifindex == priv->oif)
- priv->oif = -1;
- break;
- }
-
- return NOTIFY_DONE;
-}
-
static int tee_tg_check(const struct xt_tgchk_param *par)
{
struct xt_tee_tginfo *info = par->targinfo;
- struct xt_tee_priv *priv;
-
- /* 0.0.0.0 and :: not allowed */
- if (memcmp(&info->gw, &tee_zero_address,
- sizeof(tee_zero_address)) == 0)
- return -EINVAL;
-
- if (info->oif[0]) {
- if (info->oif[sizeof(info->oif)-1] != '\0')
- return -EINVAL;
-
- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
- if (priv == NULL)
- return -ENOMEM;
-
- priv->tginfo = info;
- priv->oif = -1;
- priv->notifier.notifier_call = tee_netdev_event;
- info->priv = priv;
+ struct nf_tee *tee;
- register_netdevice_notifier(&priv->notifier);
- } else
- info->priv = NULL;
+ tee = nf_tee_new(info->gw, info->oif);
+ if (IS_ERR(tee))
+ return PTR_ERR(tee);
+ info->priv = (struct xt_tee_priv *)tee;
return 0;
}
@@ -258,10 +59,7 @@ static void tee_tg_destroy(const struct xt_tgdtor_param *par)
{
struct xt_tee_tginfo *info = par->targinfo;
- if (info->priv) {
- unregister_netdevice_notifier(&info->priv->notifier);
- kfree(info->priv);
- }
+ nf_tee_destroy((struct nf_tee *)info->priv);
}
static struct xt_target tee_tg_reg[] __read_mostly = {
--
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^ permalink raw reply related [flat|nested] 2+ messages in thread* [RFC PATCH 2/2] netfilter: nf_tables: add nft_tee expression
2015-02-11 18:39 [RFC PATCH 1/2] netfilter: refactor xt_TEE code Arturo Borrero Gonzalez
@ 2015-02-11 18:39 ` Arturo Borrero Gonzalez
0 siblings, 0 replies; 2+ messages in thread
From: Arturo Borrero Gonzalez @ 2015-02-11 18:39 UTC (permalink / raw)
To: netfilter-devel; +Cc: kaber, pablo
This new expression uses the nf_tee engine to redirect packets
to a given gateway.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
---
include/net/netfilter/nft_tee.h | 22 ++++++++
include/uapi/linux/netfilter/nf_tables.h | 14 +++++
net/ipv4/netfilter/Kconfig | 8 +++
net/ipv4/netfilter/Makefile | 1
net/ipv4/netfilter/nft_tee_ipv4.c | 65 +++++++++++++++++++++++
net/ipv6/netfilter/Kconfig | 8 +++
net/ipv6/netfilter/Makefile | 1
net/ipv6/netfilter/nft_tee_ipv6.c | 65 +++++++++++++++++++++++
net/netfilter/Kconfig | 8 +++
net/netfilter/Makefile | 1
net/netfilter/nft_tee.c | 85 ++++++++++++++++++++++++++++++
11 files changed, 278 insertions(+)
create mode 100644 include/net/netfilter/nft_tee.h
create mode 100644 net/ipv4/netfilter/nft_tee_ipv4.c
create mode 100644 net/ipv6/netfilter/nft_tee_ipv6.c
create mode 100644 net/netfilter/nft_tee.c
diff --git a/include/net/netfilter/nft_tee.h b/include/net/netfilter/nft_tee.h
new file mode 100644
index 0000000..5a8e70a
--- /dev/null
+++ b/include/net/netfilter/nft_tee.h
@@ -0,0 +1,22 @@
+#ifndef _NFT_TEE_H_
+#define _NFT_TEE_H_
+
+#include <net/netfilter/nf_tee.h>
+
+struct nft_tee {
+ struct nf_tee *tee;
+ struct nft_data data; /* gw */
+ u8 dlen; /* gw len */
+};
+
+extern const struct nla_policy nft_tee_policy[];
+
+int nft_tee_init(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nlattr * const tb[]);
+
+void nft_tee_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr);
+
+int nft_tee_dump(struct sk_buff *skb, const struct nft_expr *expr);
+
+#endif /* _NFT_TEE_H_ */
diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 832bc46..8dade0a 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -856,6 +856,20 @@ enum nft_redir_attributes {
#define NFTA_REDIR_MAX (__NFTA_REDIR_MAX - 1)
/**
+ * enum nft_tee_attributes - nf_tables tee expression netlink attributes
+ *
+ * @NFTA_TEE_GW: tee gateway (NLA_NESTED: nft_data_attributes)
+ * @NFTA_TEE_OIF: tee output interface name (NLA_STRING)
+ */
+enum nft_tee_attributes {
+ NFTA_TEE_UNSPEC,
+ NFTA_TEE_GW,
+ NFTA_TEE_OIF,
+ __NFTA_TEE_MAX
+};
+#define NFTA_TEE_MAX (__NFTA_TEE_MAX - 1)
+
+/**
* enum nft_gen_attributes - nf_tables ruleset generation attributes
*
* @NFTA_GEN_ID: Ruleset generation ID (NLA_U32)
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index d71dbdf..a21865d 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -130,6 +130,14 @@ config NFT_REDIR_IPV4
This is the expression that provides IPv4 redirect support for
nf_tables.
+config NFT_TEE_IPV4
+ tristate "IPv4 tee suport for nf_tables"
+ depends on NF_TABLES_IPV4
+ depends on NFT_TEE
+ select NF_TEE_IPV4
+ help
+ This is the module that provides IPv4 tee support for nf_tables.
+
config NF_NAT_SNMP_BASIC
tristate "Basic SNMP-ALG support"
depends on NF_CONNTRACK_SNMP
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 6b492de..08a008c 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_NFT_CHAIN_NAT_IPV4) += nft_chain_nat_ipv4.o
obj-$(CONFIG_NFT_REJECT_IPV4) += nft_reject_ipv4.o
obj-$(CONFIG_NFT_MASQ_IPV4) += nft_masq_ipv4.o
obj-$(CONFIG_NFT_REDIR_IPV4) += nft_redir_ipv4.o
+obj-$(CONFIG_NFT_TEE_IPV4) += nft_tee_ipv4.o
obj-$(CONFIG_NF_TABLES_ARP) += nf_tables_arp.o
# generic IP tables
diff --git a/net/ipv4/netfilter/nft_tee_ipv4.c b/net/ipv4/netfilter/nft_tee_ipv4.c
new file mode 100644
index 0000000..cfe6286
--- /dev/null
+++ b/net/ipv4/netfilter/nft_tee_ipv4.c
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2015 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/seqlock.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nft_tee.h>
+#include <net/netfilter/ipv4/nf_tee_ipv4.h>
+
+static void nft_tee_ipv4_eval(const struct nft_expr *expr,
+ struct nft_data data[NFT_REG_MAX + 1],
+ const struct nft_pktinfo *pkt)
+{
+ struct nft_tee *priv = nft_expr_priv(expr);
+
+ priv->tee->hooknum = pkt->ops->hooknum;
+
+ nf_tee_ipv4(pkt->skb, priv->tee);
+}
+
+static struct nft_expr_type nft_tee_ipv4_type;
+static const struct nft_expr_ops nft_tee_ipv4_ops = {
+ .type = &nft_tee_ipv4_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_tee)),
+ .eval = nft_tee_ipv4_eval,
+ .init = nft_tee_init,
+ .destroy = nft_tee_destroy,
+ .dump = nft_tee_dump,
+};
+
+static struct nft_expr_type nft_tee_ipv4_type __read_mostly = {
+ .family = NFPROTO_IPV4,
+ .name = "tee",
+ .ops = &nft_tee_ipv4_ops,
+ .policy = nft_tee_policy,
+ .maxattr = NFTA_TEE_MAX,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_tee_ipv4_module_init(void)
+{
+ return nft_register_expr(&nft_tee_ipv4_type);
+}
+
+static void __exit nft_tee_ipv4_module_exit(void)
+{
+ nft_unregister_expr(&nft_tee_ipv4_type);
+}
+
+module_init(nft_tee_ipv4_module_init);
+module_exit(nft_tee_ipv4_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
+MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "tee");
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index fefd1bb..2530e2c 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -110,6 +110,14 @@ config NFT_REDIR_IPV6
endif # NF_NAT_IPV6
+config NFT_TEE_IPV6
+ tristate "IPv6 tee support for nf_tables"
+ depends on NF_TABLES_IPV6
+ depends on NFT_TEE
+ select NF_TEE_IPV6
+ help
+ This is the module that provides IPv6 tee support for nf_tables.
+
config IP6_NF_IPTABLES
tristate "IP6 tables support (required for filtering)"
depends on INET && IPV6
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index b3a2946..da871e8 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_NFT_CHAIN_NAT_IPV6) += nft_chain_nat_ipv6.o
obj-$(CONFIG_NFT_REJECT_IPV6) += nft_reject_ipv6.o
obj-$(CONFIG_NFT_MASQ_IPV6) += nft_masq_ipv6.o
obj-$(CONFIG_NFT_REDIR_IPV6) += nft_redir_ipv6.o
+obj-$(CONFIG_NFT_TEE_IPV6) += nft_tee_ipv6.o
# matches
obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o
diff --git a/net/ipv6/netfilter/nft_tee_ipv6.c b/net/ipv6/netfilter/nft_tee_ipv6.c
new file mode 100644
index 0000000..65a5f1d
--- /dev/null
+++ b/net/ipv6/netfilter/nft_tee_ipv6.c
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2015 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/seqlock.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nft_tee.h>
+#include <net/netfilter/ipv6/nf_tee_ipv6.h>
+
+static void nft_tee_ipv6_eval(const struct nft_expr *expr,
+ struct nft_data data[NFT_REG_MAX + 1],
+ const struct nft_pktinfo *pkt)
+{
+ struct nft_tee *priv = nft_expr_priv(expr);
+
+ priv->tee->hooknum = pkt->ops->hooknum;
+
+ nf_tee_ipv6(pkt->skb, priv->tee);
+}
+
+static struct nft_expr_type nft_tee_ipv6_type;
+static const struct nft_expr_ops nft_tee_ipv6_ops = {
+ .type = &nft_tee_ipv6_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_tee)),
+ .eval = nft_tee_ipv6_eval,
+ .init = nft_tee_init,
+ .destroy = nft_tee_destroy,
+ .dump = nft_tee_dump,
+};
+
+static struct nft_expr_type nft_tee_ipv6_type __read_mostly = {
+ .family = NFPROTO_IPV6,
+ .name = "tee",
+ .ops = &nft_tee_ipv6_ops,
+ .policy = nft_tee_policy,
+ .maxattr = NFTA_TEE_MAX,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_tee_ipv6_module_init(void)
+{
+ return nft_register_expr(&nft_tee_ipv6_type);
+}
+
+static void __exit nft_tee_ipv6_module_exit(void)
+{
+ nft_unregister_expr(&nft_tee_ipv6_type);
+}
+
+module_init(nft_tee_ipv6_module_init);
+module_exit(nft_tee_ipv6_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
+MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "tee");
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index f0a0712..1606b44 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -562,6 +562,14 @@ config NFT_COMPAT
x_tables match/target extensions over the nf_tables
framework.
+config NFT_TEE
+ depends on NF_TABLES
+ depends on NF_TEE
+ tristate "Netfilter nf_tables nf_tee support"
+ help
+ This option adds the "tee" expression to nf_tables which you can use
+ to copy and redirect packets to another gateway.
+
config NF_TEE
tristate "Netfilter nf_tee module"
help
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 0cd2f03..22a2b77 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -92,6 +92,7 @@ obj-$(CONFIG_NFT_COUNTER) += nft_counter.o
obj-$(CONFIG_NFT_LOG) += nft_log.o
obj-$(CONFIG_NFT_MASQ) += nft_masq.o
obj-$(CONFIG_NFT_REDIR) += nft_redir.o
+obj-$(CONFIG_NFT_TEE) += nft_tee.o
# generic X tables
obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
diff --git a/net/netfilter/nft_tee.c b/net/netfilter/nft_tee.c
new file mode 100644
index 0000000..d130140
--- /dev/null
+++ b/net/netfilter/nft_tee.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2015 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/seqlock.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nft_tee.h>
+
+const struct nla_policy nft_tee_policy[NFTA_TEE_MAX + 1] = {
+ [NFTA_TEE_GW] = { .type = NLA_NESTED },
+ [NFTA_TEE_OIF] = { .type = NLA_STRING },
+};
+EXPORT_SYMBOL_GPL(nft_tee_policy);
+
+int nft_tee_init(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nlattr * const tb[])
+{
+ struct nft_tee *priv = nft_expr_priv(expr);
+ struct nft_data_desc desc;
+ char oif_str[IFNAMSIZ];
+ union nf_inet_addr gw;
+ int err;
+
+ if (tb[NFTA_TEE_GW] == NULL)
+ return -EINVAL;
+
+ err = nft_data_init(ctx, &priv->data, &desc, tb[NFTA_TEE_GW]);
+ if (err < 0)
+ return err;
+
+ if (desc.type != NFT_DATA_VALUE)
+ return -EINVAL;
+
+ priv->dlen = desc.len;
+ memcpy(&gw, priv->data.data, priv->dlen);
+
+ memset(oif_str, 0, sizeof(oif_str));
+ if (tb[NFTA_TEE_OIF] != NULL)
+ nla_strlcpy(oif_str, tb[NFTA_TEE_OIF], sizeof(oif_str));
+
+ priv->tee = nf_tee_new(gw, oif_str);
+ if (IS_ERR(priv->tee))
+ return PTR_ERR(priv->tee);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nft_tee_init);
+
+void nft_tee_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
+{
+ struct nft_tee *priv = nft_expr_priv(expr);
+
+ nf_tee_destroy(priv->tee);
+}
+EXPORT_SYMBOL_GPL(nft_tee_destroy);
+
+int nft_tee_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+ struct nft_tee *priv = nft_expr_priv(expr);
+
+ if (priv->tee->oif_str[0])
+ if (nla_put_string(skb, NFTA_TEE_OIF, priv->tee->oif_str))
+ goto nla_put_failure;
+
+ return nft_data_dump(skb, NFTA_TEE_GW, &priv->data,
+ NFT_DATA_VALUE, priv->dlen);
+
+nla_put_failure:
+ return -1;
+}
+EXPORT_SYMBOL_GPL(nft_tee_dump);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
^ permalink raw reply related [flat|nested] 2+ messages in thread
end of thread, other threads:[~2015-02-11 18:39 UTC | newest]
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