net: core: don't account for udp header size when computing seglen
authorFlorian Westphal <fw@strlen.de>
Wed, 9 Apr 2014 08:28:50 +0000 (10:28 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 31 May 2014 04:52:14 +0000 (21:52 -0700)
commitb8362bf4315e8fc69fd342429eb4b962a2e819df
tree78e4c8457e3a8150d81aa8031e7cf7da4d1743f5
parent6ea4dd539a9a5994c215ce48377483f7dba01613
net: core: don't account for udp header size when computing seglen

[ Upstream commit 6d39d589bb76ee8a1c6cde6822006ae0053decff ]

In case of tcp, gso_size contains the tcpmss.

For UFO (udp fragmentation offloading) skbs, gso_size is the fragment
payload size, i.e. we must not account for udp header size.

Otherwise, when using virtio drivers, a to-be-forwarded UFO GSO packet
will be needlessly fragmented in the forward path, because we think its
individual segments are too large for the outgoing link.

Fixes: fe6cc55f3a9a053 ("net: ip, ipv6: handle gso skbs in forwarding path")
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Reported-by: Tobias Brunner <tobias@strongswan.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
net/core/skbuff.c