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| author | Florian Westphal | 2014-05-02 15:32:16 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso | 2014-05-04 13:23:28 +0200 |
| commit | 895162b1101b3ea5db08ca6822ae9672717efec0 (patch) | |
| tree | f1f5e7f56e89b0df803fd1f4aeb94abf5d7b1b59 /net/rxrpc/ar-proc.c | |
| parent | netfilter: ctnetlink: don't add null bindings if no nat requested (diff) | |
| download | kernel-qcow2-linux-895162b1101b3ea5db08ca6822ae9672717efec0.tar.gz kernel-qcow2-linux-895162b1101b3ea5db08ca6822ae9672717efec0.tar.xz kernel-qcow2-linux-895162b1101b3ea5db08ca6822ae9672717efec0.zip | |
netfilter: ipv4: defrag: set local_df flag on defragmented skb
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>
Diffstat (limited to 'net/rxrpc/ar-proc.c')
0 files changed, 0 insertions, 0 deletions