* [PATCH 2.4 12/18]: Backport fixes for ip6t_frag
@ 2004-12-20 7:15 Patrick McHardy
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From: Patrick McHardy @ 2004-12-20 7:15 UTC (permalink / raw)
To: David S. Miller; +Cc: netfilter-devel
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Backport fixes for ip6t_frag.
[-- Attachment #2: 12.diff --]
[-- Type: text/x-patch, Size: 7600 bytes --]
# This is a BitKeeper generated diff -Nru style patch.
#
# ChangeSet
# 2004/12/05 23:27:40+01:00 yasuyuki.kozakai@toshiba.co.jp
# [NETFILTER]: Backport fixes for ip6t_frag
#
# This patch fixes following bugs in ip6t_frag.c:
#
# - Wrong cast the pointer to extension header.
# - replaced "struct fraghdr" with "struct frag_hdr".
# - header length of Fragment Header is statically 8 octets.
# Then the option "--frag-len" doesn't make sense.
# - There are endian issues where using frag->info.
# - Reserved fields are not 2 bit but 8bit + 2 bit. (see RFC2460)
#
# Signed-off-by: Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>
# Signed-off-by: Patrick McHardy <kaber@trash.net>
#
# net/ipv6/netfilter/ip6t_frag.c
# 2004/12/05 23:27:38+01:00 yasuyuki.kozakai@toshiba.co.jp +38 -58
# [NETFILTER]: Backport fixes for ip6t_frag
#
# This patch fixes following bugs in ip6t_frag.c:
#
# - Wrong cast the pointer to extension header.
# - replaced "struct fraghdr" with "struct frag_hdr".
# - header length of Fragment Header is statically 8 octets.
# Then the option "--frag-len" doesn't make sense.
# - There are endian issues where using frag->info.
# - Reserved fields are not 2 bit but 8bit + 2 bit. (see RFC2460)
#
# Signed-off-by: Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>
# Signed-off-by: Patrick McHardy <kaber@trash.net>
#
diff -Nru a/net/ipv6/netfilter/ip6t_frag.c b/net/ipv6/netfilter/ip6t_frag.c
--- a/net/ipv6/netfilter/ip6t_frag.c 2004-12-20 07:01:25 +01:00
+++ b/net/ipv6/netfilter/ip6t_frag.c 2004-12-20 07:01:25 +01:00
@@ -6,8 +6,6 @@
#include <net/checksum.h>
#include <net/ipv6.h>
-#include <asm/byteorder.h>
-
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter_ipv6/ip6t_frag.h>
@@ -22,28 +20,7 @@
#define DEBUGP(format, args...)
#endif
-#if 0
-#if BYTE_ORDER == BIG_ENDIAN
-#define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
-#define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
-#define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
-#else /* BYTE_ORDER == LITTLE_ENDIAN */
-#define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
-#define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
-#define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
-#endif
-#endif
-
-#define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
-#define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
-#define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
-
-struct fraghdr {
- __u8 nexthdr;
- __u8 hdrlen;
- __u16 info;
- __u32 id;
-};
+#define IP6_MF 0x0001
/* Returns 1 if the id is matched by the range, 0 otherwise */
static inline int
@@ -67,7 +44,7 @@
u_int16_t datalen,
int *hotdrop)
{
- struct fraghdr *frag = NULL;
+ struct frag_hdr *frag = NULL;
const struct ip6t_frag *fraginfo = matchinfo;
unsigned int temp;
int len;
@@ -100,7 +77,7 @@
break;
}
- hdr=(struct ipv6_opt_hdr *)skb->data+ptr;
+ hdr=(struct ipv6_opt_hdr *)(skb->data+ptr);
/* Calculate the header length */
if (nexthdr == NEXTHDR_FRAGMENT) {
@@ -143,59 +120,62 @@
/* FRAG header not found */
if ( temp != MASK_FRAGMENT ) return 0;
- if (len < (int)sizeof(struct fraghdr)){
+ if (len < sizeof(struct frag_hdr)){
*hotdrop = 1;
return 0;
}
- frag = (struct fraghdr *) (skb->data + ptr);
+ frag = (struct frag_hdr *) (skb->data + ptr);
- DEBUGP("IPv6 FRAG LEN %u %u ", hdrlen, frag->hdrlen);
- DEBUGP("INFO %04X ", frag->info);
- DEBUGP("OFFSET %04X ", frag->info & IP6F_OFF_MASK);
- DEBUGP("RES %04X ", frag->info & IP6F_RESERVED_MASK);
- DEBUGP("MF %04X ", frag->info & IP6F_MORE_FRAG);
- DEBUGP("ID %u %08X\n", ntohl(frag->id), ntohl(frag->id));
+ DEBUGP("INFO %04X ", frag->frag_off);
+ DEBUGP("OFFSET %04X ", ntohs(frag->frag_off) & ~0x7);
+ DEBUGP("RES %02X %04X", frag->reserved, ntohs(frag->frag_off) & 0x6);
+ DEBUGP("MF %04X ", frag->frag_off & htons(IP6_MF));
+ DEBUGP("ID %u %08X\n", ntohl(frag->identification),
+ ntohl(frag->identification));
DEBUGP("IPv6 FRAG id %02X ",
(id_match(fraginfo->ids[0], fraginfo->ids[1],
- ntohl(frag->id),
+ ntohl(frag->identification),
!!(fraginfo->invflags & IP6T_FRAG_INV_IDS))));
- DEBUGP("len %02X %04X %02X ",
- fraginfo->hdrlen, hdrlen,
- (!fraginfo->hdrlen ||
- (fraginfo->hdrlen == hdrlen) ^
- !!(fraginfo->invflags & IP6T_FRAG_INV_LEN)));
- DEBUGP("res %02X %02X %02X ",
- (fraginfo->flags & IP6T_FRAG_RES), frag->info & IP6F_RESERVED_MASK,
- !((fraginfo->flags & IP6T_FRAG_RES) && (frag->info & IP6F_RESERVED_MASK)));
+ DEBUGP("res %02X %02X%04X %02X ",
+ (fraginfo->flags & IP6T_FRAG_RES), frag->reserved,
+ ntohs(frag->frag_off) & 0x6,
+ !((fraginfo->flags & IP6T_FRAG_RES)
+ && (frag->reserved || (ntohs(frag->frag_off) & 0x6))));
DEBUGP("first %02X %02X %02X ",
- (fraginfo->flags & IP6T_FRAG_FST), frag->info & IP6F_OFF_MASK,
- !((fraginfo->flags & IP6T_FRAG_FST) && (frag->info & IP6F_OFF_MASK)));
+ (fraginfo->flags & IP6T_FRAG_FST),
+ ntohs(frag->frag_off) & ~0x7,
+ !((fraginfo->flags & IP6T_FRAG_FST)
+ && (ntohs(frag->frag_off) & ~0x7)));
DEBUGP("mf %02X %02X %02X ",
- (fraginfo->flags & IP6T_FRAG_MF), frag->info & IP6F_MORE_FRAG,
- !((fraginfo->flags & IP6T_FRAG_MF) && !((frag->info & IP6F_MORE_FRAG))));
+ (fraginfo->flags & IP6T_FRAG_MF),
+ ntohs(frag->frag_off) & IP6_MF,
+ !((fraginfo->flags & IP6T_FRAG_MF)
+ && !((ntohs(frag->frag_off) & IP6_MF))));
DEBUGP("last %02X %02X %02X\n",
- (fraginfo->flags & IP6T_FRAG_NMF), frag->info & IP6F_MORE_FRAG,
- !((fraginfo->flags & IP6T_FRAG_NMF) && (frag->info & IP6F_MORE_FRAG)));
+ (fraginfo->flags & IP6T_FRAG_NMF),
+ ntohs(frag->frag_off) & IP6_MF,
+ !((fraginfo->flags & IP6T_FRAG_NMF)
+ && (ntohs(frag->frag_off) & IP6_MF)));
return (frag != NULL)
&&
(id_match(fraginfo->ids[0], fraginfo->ids[1],
- ntohl(frag->id),
+ ntohl(frag->identification),
!!(fraginfo->invflags & IP6T_FRAG_INV_IDS)))
&&
- (!fraginfo->hdrlen ||
- (fraginfo->hdrlen == hdrlen) ^
- !!(fraginfo->invflags & IP6T_FRAG_INV_LEN))
- &&
- !((fraginfo->flags & IP6T_FRAG_RES) && (frag->info & IP6F_RESERVED_MASK))
+ !((fraginfo->flags & IP6T_FRAG_RES)
+ && (frag->reserved || (ntohs(frag->frag_off) & 0x6)))
&&
- !((fraginfo->flags & IP6T_FRAG_FST) && (frag->info & IP6F_OFF_MASK))
+ !((fraginfo->flags & IP6T_FRAG_FST)
+ && (ntohs(frag->frag_off) & ~0x7))
&&
- !((fraginfo->flags & IP6T_FRAG_MF) && !((frag->info & IP6F_MORE_FRAG)))
+ !((fraginfo->flags & IP6T_FRAG_MF)
+ && !(ntohs(frag->frag_off) & IP6_MF))
&&
- !((fraginfo->flags & IP6T_FRAG_NMF) && (frag->info & IP6F_MORE_FRAG));
+ !((fraginfo->flags & IP6T_FRAG_NMF)
+ && (ntohs(frag->frag_off) & IP6_MF));
}
/* Called when user tries to insert an entry of this type. */
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2004-12-20 7:15 [PATCH 2.4 12/18]: Backport fixes for ip6t_frag Patrick McHardy
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