- 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

The problem was that when the refcount hit 0, it was unconditionally
assuming that it had been added, which is wrong.  The patch below
corrects that, and fixes the Oops when loading the floppy driver.