itojun dc1d7df811 do not initialize rmx_mtu on RTM_ADD.
on gateway change, copy rmx_mtu from gateway only under the following condition:
- current MTU is not locked
- current MTU was discovered via PMTUD

XXX if gateway has MTU == 0, current MTU is set to 0 and we are going to
rediscover PMTU again.  is it good or bad?
2001-07-26 05:47:37 +00:00
..
2001-07-26 05:47:37 +00:00