From: Florian Westphal <fw@strlen.de>
Date: Sun, 4 May 2014 22:03:34 +0000 (+0200)
Subject: net: ipv6: send pkttoobig immediately if orig frag size > mtu
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~146^2~61
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=418a31561d594a2b636c1e2fa94ecd9e1245abb1;p=pandora-kernel.git

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>
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