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, 3 insertions, 3 deletions

diff --git a/sys/netinet6/in6.h b/sys/netinet6/in6.h
index 7187aec..95b4a0c 100644
--- a/sys/netinet6/in6.h
+++ b/sys/netinet6/in6.h
@@ -593,9 +593,9 @@ struct ip6_mtuinfo {
 #define IPV6CTL_MAPPED_ADDR	23
 #endif
 #define IPV6CTL_V6ONLY		24
-#define IPV6CTL_RTEXPIRE	25	/* cloned route expiration time */
-#define IPV6CTL_RTMINEXPIRE	26	/* min value for expiration time */
-#define IPV6CTL_RTMAXCACHE	27	/* trigger level for dynamic expire */
+/*	IPV6CTL_RTEXPIRE	25	deprecated */
+/*	IPV6CTL_RTMINEXPIRE	26	deprecated */
+/*	IPV6CTL_RTMAXCACHE	27	deprecated */
 
 #define IPV6CTL_USETEMPADDR	32	/* use temporary addresses (RFC3041) */
 #define IPV6CTL_TEMPPLTIME	33	/* preferred lifetime for tmpaddrs */