tree 4d2e3e68f09ad6177c220448ef006fd2af30c131
parent 9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc
author Jarno Rajahalme <jarno@ovn.org> 1486668120 -0800
committer David S. Miller <davem@davemloft.net> 1486699174 -0500

openvswitch: Add force commit.

Stateful network admission policy may allow connections to one
direction and reject connections initiated in the other direction.
After policy change it is possible that for a new connection an
overlapping conntrack entry already exists, where the original
direction of the existing connection is opposed to the new
connection's initial packet.

Most importantly, conntrack state relating to the current packet gets
the "reply" designation based on whether the original direction tuple
or the reply direction tuple matched.  If this "directionality" is
wrong w.r.t. to the stateful network admission policy it may happen
that packets in neither direction are correctly admitted.

This patch adds a new "force commit" option to the OVS conntrack
action that checks the original direction of an existing conntrack
entry.  If that direction is opposed to the current packet, the
existing conntrack entry is deleted and a new one is subsequently
created in the correct direction.

Signed-off-by: Jarno Rajahalme <jarno@ovn.org>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Acked-by: Joe Stringer <joe@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>