freebsd-src/sbin/route/keywords
Alexander V. Chernikov 670e8b3b8c 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
2014-11-11 02:52:40 +00:00

58 lines
386 B
Plaintext

# @(#)keywords 8.2 (Berkeley) 3/19/94
# $FreeBSD$
4
6
add
blackhole
change
cloning
del
delete
dst
expire
fib
flush
gateway
genmask
get
host
hopcount
iface
interface
ifa
ifp
inet
inet6
iso
link
llinfo
lock
lockrest
mask
monitor
mtu
net
netmask
nostatic
nostick
osi
prefixlen
proto1
proto2
proxy
recvpipe
reject
rtt
rttvar
sa
sendpipe
show
ssthresh
static
sticky
weight
x25
xns
xresolve