[NETFILTER]: Introduce NF_INET_ hook values

[safe/jmp/linux-2.6] / net / ipv4 / ip_forward.c

diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c
index 467ebed..0b3b328 100644 (file)
--- a/net/ipv4/ip_forward.c
+++ b/net/ipv4/ip_forward.c
@@ -40,7 +40,7 @@
 #include <net/route.h>
 #include <net/xfrm.h>
 
-static inline int ip_forward_finish(struct sk_buff *skb)
+static int ip_forward_finish(struct sk_buff *skb)
 {
        struct ip_options * opt = &(IPCB(skb)->opt);
 
@@ -67,7 +67,7 @@ int ip_forward(struct sk_buff *skb)
        if (skb->pkt_type != PACKET_HOST)
                goto drop;
 
-       skb->ip_summed = CHECKSUM_NONE;
+       skb_forward_csum(skb);
 
        /*
         *      According to the RFC, we must first decrease the TTL field. If
@@ -85,6 +85,14 @@ int ip_forward(struct sk_buff *skb)
        if (opt->is_strictroute && rt->rt_dst != rt->rt_gateway)
                goto sr_failed;
 
+       if (unlikely(skb->len > dst_mtu(&rt->u.dst) &&
+                    (ip_hdr(skb)->frag_off & htons(IP_DF))) && !skb->local_df) {
+               IP_INC_STATS(IPSTATS_MIB_FRAGFAILS);
+               icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+                         htonl(dst_mtu(&rt->u.dst)));
+               goto drop;
+       }
+
        /* We are about to mangle packet. Copy it! */
        if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+rt->u.dst.header_len))
                goto drop;
@@ -97,12 +105,12 @@ int ip_forward(struct sk_buff *skb)
         *      We now generate an ICMP HOST REDIRECT giving the route
         *      we calculated.
         */
-       if (rt->rt_flags&RTCF_DOREDIRECT && !opt->srr)
+       if (rt->rt_flags&RTCF_DOREDIRECT && !opt->srr && !skb->sp)
                ip_rt_send_redirect(skb);
 
        skb->priority = rt_tos2priority(iph->tos);
 
-       return NF_HOOK(PF_INET, NF_IP_FORWARD, skb, skb->dev, rt->u.dst.dev,
+       return NF_HOOK(PF_INET, NF_INET_FORWARD, skb, skb->dev, rt->u.dst.dev,
                       ip_forward_finish);
 
 sr_failed: