net: ipv6: send pkttoobig immediately if orig frag size > mtu

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[ Upstream commit 418a31561d ]

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: fe6cc55f3a ("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>

...

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Florian Westphal 2014-05-05 00:03:34 +02:00 • committed by Greg Kroah-Hartman

parent 1f68835d92

commit 8eb6ded767

1 changed files with 5 additions and 1 deletions

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net/ipv6/ip6_output.c

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