diff options
| author |   Florian Westphal <fw@strlen.de> | 2014-05-05 00:03:34 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-05-07 15:27:59 -0400 |
| commit | 418a31561d594a2b636c1e2fa94ecd9e1245abb1 (patch) | |
| tree | 0545fad3593e0860c9e6efd509d8b5add34e8352 | |
| parent | net: ipv4: ip_forward: fix inverted local_df test (diff) | |
| download | linux-dev-418a31561d594a2b636c1e2fa94ecd9e1245abb1.tar.xz linux-dev-418a31561d594a2b636c1e2fa94ecd9e1245abb1.zip | |
net: ipv6: send pkttoobig immediately if orig frag size > mtu
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>
| -rw-r--r-- | net/ipv6/ip6_output.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 40e7581374f7..31a38bde69ef 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; |