net: preserve IP control block during GSO segmentation

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[ Upstream commit 9207f9d45b ]

Skb_gso_segment() uses skb control block during segmentation.
This patch adds 32-bytes room for previous control block which
will be copied into all resulting segments.

This patch fixes kernel crash during fragmenting forwarded packets.
Fragmentation requires valid IP CB in skb for clearing ip options.
Also patch removes custom save/restore in ovs code, now it's redundant.

Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Link: http://lkml.kernel.org/r/CALYGNiP-0MZ-FExV2HutTvE9U-QQtkKSoE--KN=JQE5STYsjAA@mail.gmail.com
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Konstantin Khlebnikov 2016-01-08 15:21:46 +03:00 • committed by Greg Kroah-Hartman

parent b856abbb45

commit 1f0bdf6092

5 changed files with 11 additions and 5 deletions

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5

net/core/dev.c

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1

net/ipv4/ip_output.c

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5

net/openvswitch/datapath.c

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2

net/xfrm/xfrm_output.c

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