- crash due to redundant dst_release.
- setting expire timeout on wrong route
- wrong mtu is selected when device mtu changed while device is down
- not working pmtu discovery timeout on cloned routes
- more reasonable behaviour on administrative increase of device mtu
- Ported to 2.5.44 by Alexey N. Kuznetsov.

- Changed dst named metrics, to RTAX_MAX metrics array.
- Add inline shorthands to access them
- Add update_pmtu and get_mss to DST ops.
- Add path component to DST, it is DST itself by default.

into nuts.ninka.net:/home/davem/src/BK/net-2.5

This also buries ip_proc.c.

into nuts.ninka.net:/home/davem/src/BK/net-2.5

Also move the fib code back to the fib implementation, and that will
now be done for udp and arp, then finally burying the ip_proc stillborn.

into nuts.ninka.net:/home/davem/src/BK/net-2.5

into nuts.ninka.net:/home/davem/src/BK/net-2.5