fix multiplei repetitive typos in comments, messages and documentation. mainly because copy paste code big amount of files are affected.

route(4): add RO_MISSFILTER socket option

This allows filtering of specific RTM_MISS destination sockaddrs.

Add more message types.
XXX: Need more updates to the doc

branches: 1.31.4; 1.31.6;
Remove workaround for ancient HTML generation code.

branches: 1.30.4;
Cast sizeof to socklen_t as pointed out by kre@

Add RO_MSGFILTER socket option to PF_ROUTE to filter out
un-wanted route(4) messages.

Inspired by the ROUTE_MSGFILTER equivalent in OpenBSD,
but with an API which allows the full range of potential message types.

branches: 1.28.2;
Add ifam_pid and ifam_addrflags to ifa_msghdr.
Re-version RTM_NEWADDR, RTM_DELADDR, RTM_CHGADDR and NET_RT_IFLIST.
Add compat code for old version.

branches: 1.27.2;
Sort sections.

Separate nexthop caches from the routing table

By this change, nexthop caches (IP-MAC address pair) are not stored
in the routing table anymore. Instead nexthop caches are stored in
each network interface; we already have lltable/llentry data structure
for this purpose. This change also obsoletes the concept of cloning/cloned
routes. Cloned routes no longer exist while cloning routes still exist
with renamed to connected routes.

Noticeable changes are:
- Nexthop caches aren't listed in route show/netstat -r
- sysctl(NET_RT_DUMP) doesn't return them
- If RTF_LLDATA is specified, it returns nexthop caches
- Several definitions of routing flags and messages are removed
- RTF_CLONING, RTF_XRESOLVE, RTF_LLINFO, RTF_CLONED and RTM_RESOLVE
- RTF_CONNECTED is added
- It has the same value of RTF_CLONING for backward compatibility
- route's -xresolve, -[no]cloned and -llinfo options are removed
- -[no]cloning remains because it seems there are users
- -[no]connected is introduced and recommended
to be used instead of -[no]cloning
- route show/netstat -r drops some flags
- 'L' and 'c' are not seen anymore
- 'C' now indicates a connected route
- Gateway value of a route of an interface address is now not
a L2 address but "link#N" like a connected (cloning) route
- Proxy ARP: "arp -s ... pub" doesn't create a route

You can know details of behavior changes by seeing diffs under tests/.

Proposed on tech-net and tech-kern:
http://mail-index.netbsd.org/tech-net/2016/03/11/msg005701.html

Add RTF_BROADCAST to mark routes used for the broadcast address when
they are created on the fly. This makes it clear what the route is for
and allows an optimisation in ip_output() by avoiding a call to
in_broadcast() because most of the time we do talk to a host.
It also avoids a needless allocation for the storage of llinfo_arp and
thus vanishes from arp(8) - it showed as incomplete anyway so this
is a nice side effect.

Guard against this and routes marked with RTF_BLACKHOLE in
ip_fastforward().
While here, guard against routes marked with RTF_BLACKHOLE in
ip6_fastforward().
RTF_BROADCAST is IPv4 only, so don't bother checking that here.

Document RTF_LOCAL

Sync route flags from net/route.h

Remove extra dot.

Instead of .Ar use .Fa or .Vt as appropriate.

Use .Er for errors instead of .Dv

For IPv6, emit RTM_NEWADDR once DAD completes and also when address flag
changes. Tentative addresses are not emitted.

Version bumped so userland can detect this behaviour change.

branches: 1.18.2; 1.18.8;
add RTA_TAG as defined in <net/route.h>

New sentence, new line; add serial comma.

Document RTM_CHGADDR and the newer RTM_IFINFO messages.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22309, verified by myself.

Use
.In header.h
instead of
.Fd #include \*[Lt]header.h\*[Gt]
Much easier to read and write, and supported by groff for ages.
Okayed by ross.

bandwidth, not bandwith.

Spelling fixes, from Sergey Svishchev in kern/16650.

Generate <>& symbolically. I'm avoiding .../dist/... directories for now.

Typos and whitespace fixes.

mark cloned routes with RTF_CLONED. present it with netstat -r by "c".

let static routes overwrite cloned routes, as cloned routes can come back again
if necessary. behavior same as freebsd/bsdi, code partially from bsdi42.
(NRL rt->rt_parent was not added)
should fix PR 11916 and maybe some other PRs with ARP behavior.

recompilation of usr.sbin/route6d is suggested.

document RTM_IFANNOUNCE.
From: Christoph Badura <bad@bsd.de>

branches: 1.7.10;
Change occurrences of "UNIX" to .Ux or .At as appropriate.

Document the other two types of message header (if_msghdr and
ifa_msghdr) that are used for the RTM_NEWADDR, RTM_DELADDR and
RTM_IFINFO messages. Also line up the comments a bit better in the
displays.

Fix typos.

replace reference to getkerninfo(2) with reference to sysctl(3),
resync structures and definitions with <net/route.h>; PR 2007
also add SEE ALSO section, and misc. cleanup

Merged with 4.4lite.
Changed to conform to NetBSD's new RCS Id convention.

Add RCS identifiers.

branches: 1.1.1;
Initial revision