[SK_BUFF]: Introduce skb_set_transport_header

[linux-2.6-omap-h63xx.git] / net / ipv4 / netfilter / ip_nat_standalone.c

diff --git a/net/ipv4/netfilter/ip_nat_standalone.c b/net/ipv4/netfilter/ip_nat_standalone.c
index ad66328baa5dfee8f236b9f67c6e52c2840986ae..32f7bf661fc8a343db0434aad8b7db6733874616 100644 (file)
--- a/net/ipv4/netfilter/ip_nat_standalone.c
+++ b/net/ipv4/netfilter/ip_nat_standalone.c
@@ -81,7 +81,7 @@ static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
        }
 }
 #endif
-               
+
 static unsigned int
 ip_nat_fn(unsigned int hooknum,
          struct sk_buff **pskb,
@@ -97,7 +97,7 @@ ip_nat_fn(unsigned int hooknum,
 
        /* We never see fragments: conntrack defrags on pre-routing
           and local-out, and ip_nat_out protects post-routing. */
-       IP_NF_ASSERT(!((*pskb)->nh.iph->frag_off
+       IP_NF_ASSERT(!(ip_hdr(*pskb)->frag_off
                       & htons(IP_MF|IP_OFFSET)));
 
        ct = ip_conntrack_get(*pskb, &ctinfo);
@@ -107,13 +107,12 @@ ip_nat_fn(unsigned int hooknum,
           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) {
+                  hash table yet).  We must not let this through, in
+                  case we're doing NAT to the same network. */
+               if (ip_hdr(*pskb)->protocol == IPPROTO_ICMP) {
                        struct icmphdr _hdr, *hp;
 
-                       hp = skb_header_pointer(*pskb,
-                                               (*pskb)->nh.iph->ihl*4,
+                       hp = skb_header_pointer(*pskb, ip_hdrlen(*pskb),
                                                sizeof(_hdr), &_hdr);
                        if (hp != NULL &&
                            hp->type == ICMP_REDIRECT)
@@ -129,7 +128,7 @@ ip_nat_fn(unsigned int hooknum,
        switch (ctinfo) {
        case IP_CT_RELATED:
        case IP_CT_RELATED+IP_CT_IS_REPLY:
-               if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
+               if (ip_hdr(*pskb)->protocol == IPPROTO_ICMP) {
                        if (!ip_nat_icmp_reply_translation(ct, ctinfo,
                                                           hooknum, pskb))
                                return NF_DROP;
@@ -148,7 +147,7 @@ ip_nat_fn(unsigned int hooknum,
                        if (unlikely(is_confirmed(ct)))
                                /* NAT module was loaded late */
                                ret = alloc_null_binding_confirmed(ct, info,
-                                                                  hooknum);
+                                                                  hooknum);
                        else if (hooknum == NF_IP_LOCAL_IN)
                                /* LOCAL_IN hook doesn't have a chain!  */
                                ret = alloc_null_binding(ct, info, hooknum);
@@ -179,17 +178,17 @@ ip_nat_fn(unsigned int hooknum,
 
 static unsigned int
 ip_nat_in(unsigned int hooknum,
-          struct sk_buff **pskb,
-          const struct net_device *in,
-          const struct net_device *out,
-          int (*okfn)(struct sk_buff *))
+         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;
+       __be32 daddr = ip_hdr(*pskb)->daddr;
 
        ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
        if (ret != NF_DROP && ret != NF_STOLEN
-           && daddr != (*pskb)->nh.iph->daddr) {
+           && daddr != ip_hdr(*pskb)->daddr) {
                dst_release((*pskb)->dst);
                (*pskb)->dst = NULL;
        }
@@ -211,7 +210,7 @@ ip_nat_out(unsigned int hooknum,
 
        /* root is playing with raw sockets. */
        if ((*pskb)->len < sizeof(struct iphdr)
-           || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
+           || ip_hdrlen(*pskb) < sizeof(struct iphdr))
                return NF_ACCEPT;
 
        ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
@@ -244,7 +243,7 @@ ip_nat_local_fn(unsigned int hooknum,
 
        /* root is playing with raw sockets. */
        if ((*pskb)->len < sizeof(struct iphdr)
-           || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
+           || ip_hdrlen(*pskb) < sizeof(struct iphdr))
                return NF_ACCEPT;
 
        ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
@@ -253,14 +252,17 @@ ip_nat_local_fn(unsigned int hooknum,
                enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
 
                if (ct->tuplehash[dir].tuple.dst.ip !=
-                   ct->tuplehash[!dir].tuple.src.ip
-#ifdef CONFIG_XFRM
-                   || ct->tuplehash[dir].tuple.dst.u.all !=
-                      ct->tuplehash[!dir].tuple.src.u.all
-#endif
-                   )
+                   ct->tuplehash[!dir].tuple.src.ip) {
                        if (ip_route_me_harder(pskb, RTN_UNSPEC))
                                ret = NF_DROP;
+               }
+#ifdef CONFIG_XFRM
+               else if (ct->tuplehash[dir].tuple.dst.u.all !=
+                        ct->tuplehash[!dir].tuple.src.u.all)
+                       if (ip_xfrm_me_harder(pskb))
+                               ret = NF_DROP;
+#endif
+
        }
        return ret;
 }
@@ -277,9 +279,9 @@ ip_nat_adjust(unsigned int hooknum,
 
        ct = ip_conntrack_get(*pskb, &ctinfo);
        if (ct && test_bit(IPS_SEQ_ADJUST_BIT, &ct->status)) {
-               DEBUGP("ip_nat_standalone: adjusting sequence number\n");
-               if (!ip_nat_seq_adjust(pskb, ct, ctinfo))
-                       return NF_DROP;
+               DEBUGP("ip_nat_standalone: adjusting sequence number\n");
+               if (!ip_nat_seq_adjust(pskb, ct, ctinfo))
+                       return NF_DROP;
        }
        return NF_ACCEPT;
 }