net: Do not route unicast IP packets twice
authorIdo Schimmel <idosch@mellanox.com>
Tue, 4 Dec 2018 08:15:11 +0000 (08:15 +0000)
committerDavid S. Miller <davem@davemloft.net>
Tue, 4 Dec 2018 16:36:36 +0000 (08:36 -0800)
commitf839a6c92504cff92a10f522cf686b51ff18dd35
tree3e009acdcbadcf34c837d2018f52c9ab4374b3cc
parent875e8939953483d856de226b72d14c6a000f9457
net: Do not route unicast IP packets twice

Packets marked with 'offload_l3_fwd_mark' were already forwarded by a
capable device and should not be forwarded again by the kernel.
Therefore, have the kernel consume them.

The check is performed in ip{,6}_forward_finish() in order to allow the
kernel to process such packets in ip{,6}_forward() and generate required
exceptions. For example, ICMP redirects.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/ip_forward.c
net/ipv6/ip6_output.c