MFC r222582:

MFC r222582:
  O_FORWARD_IP is only action which depends from the result of lookup of
  dynamic rules. We are doing forwarding in the following cases:
   o For the simple ipfw fwd rule, e.g.

  	fwd 10.0.0.1 ip from any to any out xmit em0
  	fwd 127.0.0.1,3128 tcp from any to any 80 in recv em1

   o For the dynamic fwd rule, e.g.

   	fwd 192.168.0.1 tcp from any to 10.0.0.3 3333 setup keep-state

          When this rule triggers it creates a dynamic rule, but this
  	dynamic rule should forward packets only in forward direction.

   o And the last case that does not work before - simple fwd rule which
   triggers when some dynamic rule is already executed.

  PR:		kern/136695, kern/147720, kern/150798

git-svn-id: svn://svn.freebsd.org/base/stable/8@223819 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f