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-rw-r--r--net/ipv6/netfilter/ip6_tables.c106
-rw-r--r--net/ipv6/netfilter/ip6t_ah.c2
-rw-r--r--net/ipv6/netfilter/ip6t_dst.c4
-rw-r--r--net/ipv6/netfilter/ip6t_esp.c2
-rw-r--r--net/ipv6/netfilter/ip6t_frag.c2
-rw-r--r--net/ipv6/netfilter/ip6t_hbh.c4
-rw-r--r--net/ipv6/netfilter/ip6t_rt.c2
7 files changed, 48 insertions, 74 deletions
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index ea43ef1d94a..13b1a525b92 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -205,69 +205,21 @@ ip6_packet_match(const struct sk_buff *skb,
/* look for the desired protocol header */
if((ip6info->flags & IP6T_F_PROTO)) {
- u_int8_t currenthdr = ipv6->nexthdr;
- struct ipv6_opt_hdr _hdr, *hp;
- u_int16_t ptr; /* Header offset in skb */
- u_int16_t hdrlen; /* Header */
- u_int16_t _fragoff = 0, *fp = NULL;
-
- ptr = IPV6_HDR_LEN;
-
- while (ip6t_ext_hdr(currenthdr)) {
- /* Is there enough space for the next ext header? */
- if (skb->len - ptr < IPV6_OPTHDR_LEN)
- return 0;
-
- /* NONE or ESP: there isn't protocol part */
- /* If we want to count these packets in '-p all',
- * we will change the return 0 to 1*/
- if ((currenthdr == IPPROTO_NONE) ||
- (currenthdr == IPPROTO_ESP))
- break;
+ int protohdr;
+ unsigned short _frag_off;
- hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
- BUG_ON(hp == NULL);
-
- /* Size calculation */
- if (currenthdr == IPPROTO_FRAGMENT) {
- fp = skb_header_pointer(skb,
- ptr+offsetof(struct frag_hdr,
- frag_off),
- sizeof(_fragoff),
- &_fragoff);
- if (fp == NULL)
- return 0;
-
- _fragoff = ntohs(*fp) & ~0x7;
- hdrlen = 8;
- } else if (currenthdr == IPPROTO_AH)
- hdrlen = (hp->hdrlen+2)<<2;
- else
- hdrlen = ipv6_optlen(hp);
-
- currenthdr = hp->nexthdr;
- ptr += hdrlen;
- /* ptr is too large */
- if ( ptr > skb->len )
- return 0;
- if (_fragoff) {
- if (ip6t_ext_hdr(currenthdr))
- return 0;
- break;
- }
- }
-
- *protoff = ptr;
- *fragoff = _fragoff;
+ protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off);
+ if (protohdr < 0)
+ return 0;
- /* currenthdr contains the protocol header */
+ *fragoff = _frag_off;
dprintf("Packet protocol %hi ?= %s%hi.\n",
- currenthdr,
+ protohdr,
ip6info->invflags & IP6T_INV_PROTO ? "!":"",
ip6info->proto);
- if (ip6info->proto == currenthdr) {
+ if (ip6info->proto == protohdr) {
if(ip6info->invflags & IP6T_INV_PROTO) {
return 0;
}
@@ -2098,26 +2050,39 @@ static void __exit fini(void)
}
/*
- * find specified header up to transport protocol header.
- * If found target header, the offset to the header is set to *offset
- * and return 0. otherwise, return -1.
+ * find the offset to specified header or the protocol number of last header
+ * if target < 0. "last header" is transport protocol header, ESP, or
+ * "No next header".
+ *
+ * If target header is found, its offset is set in *offset and return protocol
+ * number. Otherwise, return -1.
+ *
+ * Note that non-1st fragment is special case that "the protocol number
+ * of last header" is "next header" field in Fragment header. In this case,
+ * *offset is meaningless and fragment offset is stored in *fragoff if fragoff
+ * isn't NULL.
*
- * Notes: - non-1st Fragment Header isn't skipped.
- * - ESP header isn't skipped.
- * - The target header may be trancated.
*/
-int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, u8 target)
+int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
+ int target, unsigned short *fragoff)
{
unsigned int start = (u8*)(skb->nh.ipv6h + 1) - skb->data;
u8 nexthdr = skb->nh.ipv6h->nexthdr;
unsigned int len = skb->len - start;
+ if (fragoff)
+ *fragoff = 0;
+
while (nexthdr != target) {
struct ipv6_opt_hdr _hdr, *hp;
unsigned int hdrlen;
- if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE)
+ if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) {
+ if (target < 0)
+ break;
return -1;
+ }
+
hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
if (hp == NULL)
return -1;
@@ -2131,8 +2096,17 @@ int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, u8 target)
if (fp == NULL)
return -1;
- if (ntohs(*fp) & ~0x7)
+ _frag_off = ntohs(*fp) & ~0x7;
+ if (_frag_off) {
+ if (target < 0 &&
+ ((!ipv6_ext_hdr(hp->nexthdr)) ||
+ nexthdr == NEXTHDR_NONE)) {
+ if (fragoff)
+ *fragoff = _frag_off;
+ return hp->nexthdr;
+ }
return -1;
+ }
hdrlen = 8;
} else if (nexthdr == NEXTHDR_AUTH)
hdrlen = (hp->hdrlen + 2) << 2;
@@ -2145,7 +2119,7 @@ int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, u8 target)
}
*offset = start;
- return 0;
+ return nexthdr;
}
EXPORT_SYMBOL(ip6t_register_table);
diff --git a/net/ipv6/netfilter/ip6t_ah.c b/net/ipv6/netfilter/ip6t_ah.c
index 268918d5dee..f5c1a7ff4a1 100644
--- a/net/ipv6/netfilter/ip6t_ah.c
+++ b/net/ipv6/netfilter/ip6t_ah.c
@@ -54,7 +54,7 @@ match(const struct sk_buff *skb,
unsigned int ptr;
unsigned int hdrlen = 0;
- if (ipv6_find_hdr(skb, &ptr, NEXTHDR_AUTH) < 0)
+ if (ipv6_find_hdr(skb, &ptr, NEXTHDR_AUTH, NULL) < 0)
return 0;
ah = skb_header_pointer(skb, ptr, sizeof(_ah), &_ah);
diff --git a/net/ipv6/netfilter/ip6t_dst.c b/net/ipv6/netfilter/ip6t_dst.c
index c450a635e54..48cf5f9efc9 100644
--- a/net/ipv6/netfilter/ip6t_dst.c
+++ b/net/ipv6/netfilter/ip6t_dst.c
@@ -71,9 +71,9 @@ match(const struct sk_buff *skb,
unsigned int optlen;
#if HOPBYHOP
- if (ipv6_find_hdr(skb, &ptr, NEXTHDR_HOP) < 0)
+ if (ipv6_find_hdr(skb, &ptr, NEXTHDR_HOP, NULL) < 0)
#else
- if (ipv6_find_hdr(skb, &ptr, NEXTHDR_DEST) < 0)
+ if (ipv6_find_hdr(skb, &ptr, NEXTHDR_DEST, NULL) < 0)
#endif
return 0;
diff --git a/net/ipv6/netfilter/ip6t_esp.c b/net/ipv6/netfilter/ip6t_esp.c
index 65937de1b58..e1828f6d0a4 100644
--- a/net/ipv6/netfilter/ip6t_esp.c
+++ b/net/ipv6/netfilter/ip6t_esp.c
@@ -56,7 +56,7 @@ match(const struct sk_buff *skb,
/* Make sure this isn't an evil packet */
/*DEBUGP("ipv6_esp entered \n");*/
- if (ipv6_find_hdr(skb, &ptr, NEXTHDR_ESP) < 0)
+ if (ipv6_find_hdr(skb, &ptr, NEXTHDR_ESP, NULL) < 0)
return 0;
eh = skb_header_pointer(skb, ptr, sizeof(_esp), &_esp);
diff --git a/net/ipv6/netfilter/ip6t_frag.c b/net/ipv6/netfilter/ip6t_frag.c
index 085d5f8eea2..d1549b26866 100644
--- a/net/ipv6/netfilter/ip6t_frag.c
+++ b/net/ipv6/netfilter/ip6t_frag.c
@@ -52,7 +52,7 @@ match(const struct sk_buff *skb,
const struct ip6t_frag *fraginfo = matchinfo;
unsigned int ptr;
- if (ipv6_find_hdr(skb, &ptr, NEXTHDR_FRAGMENT) < 0)
+ if (ipv6_find_hdr(skb, &ptr, NEXTHDR_FRAGMENT, NULL) < 0)
return 0;
fh = skb_header_pointer(skb, ptr, sizeof(_frag), &_frag);
diff --git a/net/ipv6/netfilter/ip6t_hbh.c b/net/ipv6/netfilter/ip6t_hbh.c
index 1d09485111d..e3bc8e2700e 100644
--- a/net/ipv6/netfilter/ip6t_hbh.c
+++ b/net/ipv6/netfilter/ip6t_hbh.c
@@ -71,9 +71,9 @@ match(const struct sk_buff *skb,
unsigned int optlen;
#if HOPBYHOP
- if (ipv6_find_hdr(skb, &ptr, NEXTHDR_HOP) < 0)
+ if (ipv6_find_hdr(skb, &ptr, NEXTHDR_HOP, NULL) < 0)
#else
- if (ipv6_find_hdr(skb, &ptr, NEXTHDR_DEST) < 0)
+ if (ipv6_find_hdr(skb, &ptr, NEXTHDR_DEST, NULL) < 0)
#endif
return 0;
diff --git a/net/ipv6/netfilter/ip6t_rt.c b/net/ipv6/netfilter/ip6t_rt.c
index beb2fd5cebb..c1e770e4554 100644
--- a/net/ipv6/netfilter/ip6t_rt.c
+++ b/net/ipv6/netfilter/ip6t_rt.c
@@ -58,7 +58,7 @@ match(const struct sk_buff *skb,
unsigned int ret = 0;
struct in6_addr *ap, _addr;
- if (ipv6_find_hdr(skb, &ptr, NEXTHDR_ROUTING) < 0)
+ if (ipv6_find_hdr(skb, &ptr, NEXTHDR_ROUTING, NULL) < 0)
return 0;
rh = skb_header_pointer(skb, ptr, sizeof(_route), &_route);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 22:51:27 +0000