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authorFlorian Westphal <fw@strlen.de>2014-05-02 15:32:16 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-06-16 13:42:53 -0700
commited6b7164b4a932f91630da7dadaa1aeb33029d25 (patch)
treea5a61187c1be0cbb6bacb413603d2290c0efc7cb /drivers/target
parent3f3a34d420f0d08d81379c03cc7d258f2f42dc3f (diff)
netfilter: ipv4: defrag: set local_df flag on defragmented skb
commit 895162b1101b3ea5db08ca6822ae9672717efec0 upstream. else we may fail to forward skb even if original fragments do fit outgoing link mtu: 1. remote sends 2k packets in two 1000 byte frags, DF set 2. we want to forward but only see '2k > mtu and DF set' 3. we then send icmp error saying that outgoing link is 1500 But original sender never sent a packet that would not fit the outgoing link. Setting local_df makes outgoing path test size vs. IPCB(skb)->frag_max_size, so we will still send the correct error in case the largest original size did not fit outgoing link mtu. Reported-by: Maxime Bizon <mbizon@freebox.fr> Suggested-by: Maxime Bizon <mbizon@freebox.fr> Fixes: 5f2d04f1f9 (ipv4: fix path MTU discovery with connection tracking) Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Cc: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/target')
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