diff options
| author | Florian Westphal <fw@strlen.de> | 2014-05-02 15:32:16 +0200 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-06-11 09:07:27 +0200 |
| commit | f4ba7e39a2dd9d482552808c094d49ef95d979ba (patch) | |
| tree | ee326bc2d08f535041a5288ecca6599248af51b8 /mm/vmstat.c | |
| parent | 888f1a0f8c36e6982040ec06447a1dcc15686562 (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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'mm/vmstat.c')
0 files changed, 0 insertions, 0 deletions