tree b13d757e51bbe03cb4a461298566b56a0f5c56ee
parent 6c3efb1526c3fcdab3e5bbc9c77710b306493507
author Eric Dumazet <eric.dumazet@gmail.com> 1324500436 -0500
committer Greg Kroah-Hartman <gregkh@suse.de> 1325888050 -0800

ipv4: reintroduce route cache garbage collector

[ Upstream commit 9f28a2fc0bd77511f649c0a788c7bf9a5fd04edb ]

Commit 2c8cec5c10b (ipv4: Cache learned PMTU information in inetpeer)
removed IP route cache garbage collector a bit too soon, as this gc was
responsible for expired routes cleanup, releasing their neighbour
reference.

As pointed out by Robert Gladewitz, recent kernels can fill and exhaust
their neighbour cache.

Reintroduce the garbage collection, since we'll have to wait our
neighbour lookups become refcount-less to not depend on this stuff.

Reported-by: Robert Gladewitz <gladewitz@gmx.de>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>