net: skb_scrub_packet(): Scrub offload_fwd_mark
authorPetr Machata <petrm@mellanox.com>
Tue, 20 Nov 2018 11:39:56 +0000 (11:39 +0000)
committerDavid S. Miller <davem@davemloft.net>
Wed, 21 Nov 2018 23:38:52 +0000 (15:38 -0800)
commitb5dd186d10ba59e6b5ba60e42b3b083df56df6f3
treeb6dd9d539cb37bdfd87b5ff873d179fae6c033ea
parentf2cbd485282014132851bf37cb2ca624a456275d
net: skb_scrub_packet(): Scrub offload_fwd_mark

When a packet is trapped and the corresponding SKB marked as
already-forwarded, it retains this marking even after it is forwarded
across veth links into another bridge. There, since it ingresses the
bridge over veth, which doesn't have offload_fwd_mark, it triggers a
warning in nbp_switchdev_frame_mark().

Then nbp_switchdev_allowed_egress() decides not to allow egress from
this bridge through another veth, because the SKB is already marked, and
the mark (of 0) of course matches. Thus the packet is incorrectly
blocked.

Solve by resetting offload_fwd_mark() in skb_scrub_packet(). That
function is called from tunnels and also from veth, and thus catches the
cases where traffic is forwarded between bridges and transformed in a
way that invalidates the marking.

Fixes: 6bc506b4fb06 ("bridge: switchdev: Add forward mark support for stacked devices")
Fixes: abf4bb6b63d0 ("skbuff: Add the offload_mr_fwd_mark field")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Suggested-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/skbuff.c