Kill custom in_matroute() radix mathing function removing one rte mutex lock.

Initially in_matrote() in_clsroute() in their current state was introduced by
r4105 20 years ago. Instead of deleting inactive routes immediately, we kept them
in route table, setting RTPRF_OURS flag and some expire time. After that, either
GC came or RTPRF_OURS got removed on first-packet. It was a good solution
in that days (and probably another decade after that) to keep TCP metrics.
However, after moving metrics to TCP hostcache in r122922, most of in_rmx
functionality became unused. It might had been used for flushing icmp-originated
routes before rte mutexes/refcounting, but I'm not sure about that.

So it looks like this is nearly impossible to make GC do its work nowadays:

in_rtkill() ignores non-RTPRF_OURS routes.
route can only become RTPRF_OURS after dropping last reference via rtfree()
which calls in_clsroute(), which, it turn, ignores UP and non-RTF_DYNAMIC routes.

Dynamic routes can still be installed via received redirect, but they
have default lifetime (no specific rt_expire) and no one has another trie walker
to call RTFREE() on them.

So, the changelist:
* remove custom rnh_match / rnh_close matching function.
* remove all GC functions
* partially revert r256695 (proto3 is no more used inside kernel,
  it is not possible to use rt_expire from user point of view, proto3 support
  is not complete)
* Finish r241884 (similar to this commit) and remove remaining IPv6 parts

MFC after:	1 month

1 files changed, 0 insertions, 15 deletions

diff --git a/share/man/man4/inet.4 b/share/man/man4/inet.4
index 0b7a108..b0b5a9e 100644
--- a/share/man/man4/inet.4
+++ b/share/man/man4/inet.4
@@ -211,21 +211,6 @@ Boolean: enable/disable accepting of source-routed IP packets (default false).
 .It Dv IPCTL_SOURCEROUTE
 .Pq ip.sourceroute
 Boolean: enable/disable forwarding of source-routed IP packets (default false).
-.It Dv IPCTL_RTEXPIRE
-.Pq ip.rtexpire
-Integer: lifetime in seconds of protocol-cloned
-.Tn IP
-routes after the last reference drops (default one hour).
-This value varies dynamically as described above.
-.It Dv IPCTL_RTMINEXPIRE
-.Pq ip.rtminexpire
-Integer: minimum value of ip.rtexpire (default ten seconds).
-This value has no effect on user modifications, but restricts the dynamic
-adaptation described above.
-.It Dv IPCTL_RTMAXCACHE
-.Pq ip.rtmaxcache
-Integer: trigger level of cached, unreferenced, protocol-cloned routes
-which initiates dynamic adaptation (default 128).
 .It Va ip.process_options
 Integer: control IP options processing.
 By setting this variable to 0, all IP options in the incoming packets