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authorFlorian Westphal <fw@strlen.de>2014-05-05 00:03:34 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-31 13:20:37 -0700
commit8eb6ded767268d02e88155b4ced544cebe2ba495 (patch)
parent1f68835d92bbfe3a14d369d3dce123c94521b105 (diff)
net: ipv6: send pkttoobig immediately if orig frag size > mtu
[ Upstream commit 418a31561d594a2b636c1e2fa94ecd9e1245abb1 ] If conntrack defragments incoming ipv6 frags it stores largest original frag size in ip6cb and sets ->local_df. We must thus first test the largest original frag size vs. mtu, and not vice versa. Without this patch PKTTOOBIG is still generated in ip6_fragment() later in the stack, but 1) IPSTATS_MIB_INTOOBIGERRORS won't increment 2) packet did (needlessly) traverse netfilter postrouting hook. Fixes: fe6cc55f3a9 ("net: ip, ipv6: handle gso skbs in forwarding path") Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 3702d179506d..264a984ae16d 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -344,12 +344,16 @@ static unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
- if (skb->len <= mtu || skb->local_df)
+ if (skb->len <= mtu)
return false;
+ /* ipv6 conntrack defrag sets max_frag_size + local_df */
if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)
return true;
+ if (skb->local_df)
+ return false;
if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu)
return false;