diff options
| author | Shan Wei <[email protected]> | 2010-04-18 16:58:22 +0000 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2010-04-21 22:48:26 -0700 |
| commit | f2228f785a9d97307aa8ba709088cfda6c3df73f (patch) | |
| tree | 3440546af96613f8204221128609bf8054a8e733 /kernel/mutex-debug.c | |
| parent | a19259c3d589a014e5f47f148f74dfc44422c82b (diff) | |
ipv6: allow to send packet after receiving ICMPv6 Too Big message with MTU field less than IPV6_MIN_MTU
According to RFC2460, PMTU is set to the IPv6 Minimum Link
MTU (1280) and a fragment header should always be included
after a node receiving Too Big message reporting PMTU is
less than the IPv6 Minimum Link MTU.
After receiving a ICMPv6 Too Big message reporting PMTU is
less than the IPv6 Minimum Link MTU, sctp *can't* send any
data/control chunk that total length including IPv6 head
and IPv6 extend head is less than IPV6_MIN_MTU(1280 bytes).
The failure occured in p6_fragment(), about reason
see following(take SHUTDOWN chunk for example):
sctp_packet_transmit (SHUTDOWN chunk, len=16 byte)
|------sctp_v6_xmit (local_df=0)
|------ip6_xmit
|------ip6_output (dst_allfrag is ture)
|------ip6_fragment
In ip6_fragment(), for local_df=0, drops the the packet
and returns EMSGSIZE.
The patch fixes it with adding check length of skb->len.
In this case, Ipv6 not to fragment upper protocol data,
just only add a fragment header before it.
Signed-off-by: Shan Wei <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'kernel/mutex-debug.c')
0 files changed, 0 insertions, 0 deletions