Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / net / ipv6 / netfilter / ip6t_ah.c

diff --git a/net/ipv6/netfilter/ip6t_ah.c b/net/ipv6/netfilter/ip6t_ah.c
index d5b94f1..2f7bb20 100644 (file)
--- a/net/ipv6/netfilter/ip6t_ah.c
+++ b/net/ipv6/netfilter/ip6t_ah.c
@@ -9,6 +9,7 @@
 
 #include <linux/module.h>
 #include <linux/skbuff.h>
+#include <linux/ip.h>
 #include <linux/ipv6.h>
 #include <linux/types.h>
 #include <net/checksum.h>
@@ -43,97 +44,27 @@ static int
 match(const struct sk_buff *skb,
       const struct net_device *in,
       const struct net_device *out,
+      const struct xt_match *match,
       const void *matchinfo,
       int offset,
       unsigned int protoff,
       int *hotdrop)
 {
-       struct ip_auth_hdr *ah = NULL, _ah;
+       struct ip_auth_hdr *ah, _ah;
        const struct ip6t_ah *ahinfo = matchinfo;
-       unsigned int temp;
-       int len;
-       u8 nexthdr;
        unsigned int ptr;
        unsigned int hdrlen = 0;
 
-       /*DEBUGP("IPv6 AH entered\n");*/
-       /* if (opt->auth == 0) return 0;
-       * It does not filled on output */
-
-       /* type of the 1st exthdr */
-       nexthdr = skb->nh.ipv6h->nexthdr;
-       /* pointer to the 1st exthdr */
-       ptr = sizeof(struct ipv6hdr);
-       /* available length */
-       len = skb->len - ptr;
-       temp = 0;
-
-       while (ip6t_ext_hdr(nexthdr)) {
-               struct ipv6_opt_hdr _hdr, *hp;
-
-               DEBUGP("ipv6_ah header iteration \n");
-
-               /* Is there enough space for the next ext header? */
-               if (len < sizeof(struct ipv6_opt_hdr))
-                       return 0;
-               /* No more exthdr -> evaluate */
-               if (nexthdr == NEXTHDR_NONE)
-                       break;
-               /* ESP -> evaluate */
-               if (nexthdr == NEXTHDR_ESP)
-                       break;
-
-               hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
-               BUG_ON(hp == NULL);
-
-               /* Calculate the header length */
-               if (nexthdr == NEXTHDR_FRAGMENT)
-                       hdrlen = 8;
-               else if (nexthdr == NEXTHDR_AUTH)
-                       hdrlen = (hp->hdrlen+2)<<2;
-               else
-                       hdrlen = ipv6_optlen(hp);
-
-               /* AH -> evaluate */
-               if (nexthdr == NEXTHDR_AUTH) {
-                       temp |= MASK_AH;
-                       break;
-               }
-
-               
-               /* set the flag */
-               switch (nexthdr) {
-               case NEXTHDR_HOP:
-               case NEXTHDR_ROUTING:
-               case NEXTHDR_FRAGMENT:
-               case NEXTHDR_AUTH:
-               case NEXTHDR_DEST:
-                       break;
-               default:
-                       DEBUGP("ipv6_ah match: unknown nextheader %u\n",nexthdr);
-                       return 0;
-               }
-
-               nexthdr = hp->nexthdr;
-               len -= hdrlen;
-               ptr += hdrlen;
-               if (ptr > skb->len) {
-                       DEBUGP("ipv6_ah: new pointer too large! \n");
-                       break;
-               }
-       }
-
-       /* AH header not found */
-       if (temp != MASK_AH)
+       if (ipv6_find_hdr(skb, &ptr, NEXTHDR_AUTH, NULL) < 0)
                return 0;
 
-       if (len < sizeof(struct ip_auth_hdr)){
+       ah = skb_header_pointer(skb, ptr, sizeof(_ah), &_ah);
+       if (ah == NULL) {
                *hotdrop = 1;
                return 0;
        }
 
-       ah = skb_header_pointer(skb, ptr, sizeof(_ah), &_ah);
-       BUG_ON(ah == NULL);
+       hdrlen = (ah->hdrlen + 2) << 2;
 
        DEBUGP("IPv6 AH LEN %u %u ", hdrlen, ah->hdrlen);
        DEBUGP("RES %04X ", ah->reserved);
@@ -168,18 +99,14 @@ match(const struct sk_buff *skb,
 /* Called when user tries to insert an entry of this type. */
 static int
 checkentry(const char *tablename,
-          const struct ip6t_ip6 *ip,
+          const void *entry,
+         const struct xt_match *match,
           void *matchinfo,
           unsigned int matchinfosize,
           unsigned int hook_mask)
 {
        const struct ip6t_ah *ahinfo = matchinfo;
 
-       if (matchinfosize != IP6T_ALIGN(sizeof(struct ip6t_ah))) {
-               DEBUGP("ip6t_ah: matchsize %u != %u\n",
-                      matchinfosize, IP6T_ALIGN(sizeof(struct ip6t_ah)));
-               return 0;
-       }
        if (ahinfo->invflags & ~IP6T_AH_INV_MASK) {
                DEBUGP("ip6t_ah: unknown flags %X\n", ahinfo->invflags);
                return 0;
@@ -189,20 +116,21 @@ checkentry(const char *tablename,
 
 static struct ip6t_match ah_match = {
        .name           = "ah",
-       .match          = &match,
-       .checkentry     = &checkentry,
+       .match          = match,
+       .matchsize      = sizeof(struct ip6t_ah),
+       .checkentry     = checkentry,
        .me             = THIS_MODULE,
 };
 
-static int __init init(void)
+static int __init ip6t_ah_init(void)
 {
        return ip6t_register_match(&ah_match);
 }
 
-static void __exit cleanup(void)
+static void __exit ip6t_ah_fini(void)
 {
        ip6t_unregister_match(&ah_match);
 }
 
-module_init(init);
-module_exit(cleanup);
+module_init(ip6t_ah_init);
+module_exit(ip6t_ah_fini);