Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec

[sfrench/cifs-2.6.git] / net / ipv6 / ip6_tunnel.c

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index db84f523656ddf876e1971c416ee03a6a1794d9d..931c38f6ff4a42fb17cf129cf6035706a24176dc 100644 (file)
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1123,8 +1123,13 @@ route_lookup:
                max_headroom += 8;
                mtu -= 8;
        }
-       if (mtu < IPV6_MIN_MTU)
-               mtu = IPV6_MIN_MTU;
+       if (skb->protocol == htons(ETH_P_IPV6)) {
+               if (mtu < IPV6_MIN_MTU)
+                       mtu = IPV6_MIN_MTU;
+       } else if (mtu < 576) {
+               mtu = 576;
+       }
+
        if (skb_dst(skb) && !t->parms.collect_md)
                skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
        if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {