Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

[cascardo/linux.git] / net / ipv4 / ip_gre.c

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index eede36e..2a61158 100644 (file)
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -313,9 +313,8 @@ static void ipgre_tunnel_uninit(struct net_device *dev)
 
 static void ipgre_err(struct sk_buff *skb, u32 info)
 {
-#ifndef I_WISH_WORLD_WERE_PERFECT
 
-/* It is not :-( All the routers (except for Linux) return only
+/* All the routers (except for Linux) return only
    8 bytes of packet payload. It means, that precise relaying of
    ICMP in the real Internet is absolutely infeasible.
 
@@ -398,149 +397,6 @@ static void ipgre_err(struct sk_buff *skb, u32 info)
 out:
        read_unlock(&ipgre_lock);
        return;
-#else
-       struct iphdr *iph = (struct iphdr*)dp;
-       struct iphdr *eiph;
-       __be16       *p = (__be16*)(dp+(iph->ihl<<2));
-       const int type = icmp_hdr(skb)->type;
-       const int code = icmp_hdr(skb)->code;
-       int rel_type = 0;
-       int rel_code = 0;
-       __be32 rel_info = 0;
-       __u32 n = 0;
-       __be16 flags;
-       int grehlen = (iph->ihl<<2) + 4;
-       struct sk_buff *skb2;
-       struct flowi fl;
-       struct rtable *rt;
-
-       if (p[1] != htons(ETH_P_IP))
-               return;
-
-       flags = p[0];
-       if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
-               if (flags&(GRE_VERSION|GRE_ROUTING))
-                       return;
-               if (flags&GRE_CSUM)
-                       grehlen += 4;
-               if (flags&GRE_KEY)
-                       grehlen += 4;
-               if (flags&GRE_SEQ)
-                       grehlen += 4;
-       }
-       if (len < grehlen + sizeof(struct iphdr))
-               return;
-       eiph = (struct iphdr*)(dp + grehlen);
-
-       switch (type) {
-       default:
-               return;
-       case ICMP_PARAMETERPROB:
-               n = ntohl(icmp_hdr(skb)->un.gateway) >> 24;
-               if (n < (iph->ihl<<2))
-                       return;
-
-               /* So... This guy found something strange INSIDE encapsulated
-                  packet. Well, he is fool, but what can we do ?
-                */
-               rel_type = ICMP_PARAMETERPROB;
-               n -= grehlen;
-               rel_info = htonl(n << 24);
-               break;
-
-       case ICMP_DEST_UNREACH:
-               switch (code) {
-               case ICMP_SR_FAILED:
-               case ICMP_PORT_UNREACH:
-                       /* Impossible event. */
-                       return;
-               case ICMP_FRAG_NEEDED:
-                       /* And it is the only really necessary thing :-) */
-                       n = ntohs(icmp_hdr(skb)->un.frag.mtu);
-                       if (n < grehlen+68)
-                               return;
-                       n -= grehlen;
-                       /* BSD 4.2 MORE DOES NOT EXIST IN NATURE. */
-                       if (n > ntohs(eiph->tot_len))
-                               return;
-                       rel_info = htonl(n);
-                       break;
-               default:
-                       /* All others are translated to HOST_UNREACH.
-                          rfc2003 contains "deep thoughts" about NET_UNREACH,
-                          I believe, it is just ether pollution. --ANK
-                        */
-                       rel_type = ICMP_DEST_UNREACH;
-                       rel_code = ICMP_HOST_UNREACH;
-                       break;
-               }
-               break;
-       case ICMP_TIME_EXCEEDED:
-               if (code != ICMP_EXC_TTL)
-                       return;
-               break;
-       }
-
-       /* Prepare fake skb to feed it to icmp_send */
-       skb2 = skb_clone(skb, GFP_ATOMIC);
-       if (skb2 == NULL)
-               return;
-       dst_release(skb2->dst);
-       skb2->dst = NULL;
-       skb_pull(skb2, skb->data - (u8*)eiph);
-       skb_reset_network_header(skb2);
-
-       /* Try to guess incoming interface */
-       memset(&fl, 0, sizeof(fl));
-       fl.fl4_dst = eiph->saddr;
-       fl.fl4_tos = RT_TOS(eiph->tos);
-       fl.proto = IPPROTO_GRE;
-       if (ip_route_output_key(dev_net(skb->dev), &rt, &fl)) {
-               kfree_skb(skb2);
-               return;
-       }
-       skb2->dev = rt->u.dst.dev;
-
-       /* route "incoming" packet */
-       if (rt->rt_flags&RTCF_LOCAL) {
-               ip_rt_put(rt);
-               rt = NULL;
-               fl.fl4_dst = eiph->daddr;
-               fl.fl4_src = eiph->saddr;
-               fl.fl4_tos = eiph->tos;
-               if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) ||
-                   rt->u.dst.dev->type != ARPHRD_IPGRE) {
-                       ip_rt_put(rt);
-                       kfree_skb(skb2);
-                       return;
-               }
-       } else {
-               ip_rt_put(rt);
-               if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, skb2->dev) ||
-                   skb2->dst->dev->type != ARPHRD_IPGRE) {
-                       kfree_skb(skb2);
-                       return;
-               }
-       }
-
-       /* change mtu on this route */
-       if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
-               if (n > dst_mtu(skb2->dst)) {
-                       kfree_skb(skb2);
-                       return;
-               }
-               skb2->dst->ops->update_pmtu(skb2->dst, n);
-       } else if (type == ICMP_TIME_EXCEEDED) {
-               struct ip_tunnel *t = netdev_priv(skb2->dev);
-               if (t->parms.iph.ttl) {
-                       rel_type = ICMP_DEST_UNREACH;
-                       rel_code = ICMP_HOST_UNREACH;
-               }
-       }
-
-       icmp_send(skb2, rel_type, rel_code, rel_info);
-       kfree_skb(skb2);
-#endif
 }
 
 static inline void ipgre_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)