ipv4: Handle PMTU in all ICMP error handlers.

[deliverable/linux.git] / net / ipv4 / ipip.c

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 2d0f99bf61b348e70d1f90308d3a0119a358f563..715338a1b205a07195e31878f50cdbef31864c86 100644 (file)
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -348,9 +348,6 @@ static int ipip_err(struct sk_buff *skb, u32 info)
                case ICMP_PORT_UNREACH:
                        /* Impossible event. */
                        return 0;
-               case ICMP_FRAG_NEEDED:
-                       /* Soft state for pmtu is maintained by IP core. */
-                       return 0;
                default:
                        /* All others are translated to HOST_UNREACH.
                           rfc2003 contains "deep thoughts" about NET_UNREACH,
@@ -369,7 +366,17 @@ static int ipip_err(struct sk_buff *skb, u32 info)
 
        rcu_read_lock();
        t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr);
-       if (t == NULL || t->parms.iph.daddr == 0)
+       if (t == NULL)
+               goto out;
+
+       if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
+               ipv4_update_pmtu(skb, dev_net(skb->dev), info,
+                                t->dev->ifindex, 0, IPPROTO_IPIP, 0);
+               err = 0;
+               goto out;
+       }
+
+       if (t->parms.iph.daddr == 0)
                goto out;
 
        err = 0;