Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Improve flexibility of receiving Router Advertisement and
automatic link-local address configuration:

- Convert a sysctl net.inet6.ip6.accept_rtadv to one for the
default value of a per-IF flag ND6_IFF_ACCEPT_RTADV, not a
global knob. The default value of the sysctl is 0.

- Add a new per-IF flag ND6_IFF_AUTO_LINKLOCAL and convert a
sysctl net.inet6.ip6.auto_linklocal to one for its default
value. The default value of the sysctl is 1.

- Make ND6_IFF_IFDISABLED more robust. It can be used to disable
IPv6 functionality of an interface now.

- Receiving RA is allowed if ip6_forwarding==0 *and*
ND6_IFF_ACCEPT_RTADV is set on that interface. The former
condition will be revisited later to support a "host + router" box
like IPv6 CPE router. The current behavior is compatible with
the older releases of FreeBSD.

- The ifconfig(8) now supports these ND6 flags as well as "nud",
"prefer_source", and "disabled" in ndp(8). The ndp(8) now
supports "auto_linklocal".

Discussed with: bz and jinmei
Reviewed by: bz
MFC after: 3 days

Remove all references to T/TCP, which was removed several months ago.

Approved by: andre

Fixed the misplaced $FreeBSD$.

mdoc(7): Use the new feature of the .In macro.

- now, IPV6CTL_V6ONLY is on by default.
- .Nx -> .Fx

sync types with headers.

note that we intentionally violate RFC2553 for security reasons.

Adviced by: itojun
Obtained from: NetBSD

correct wording.

Pointed out by: brian

Sync with reality.
IPV6CTL_MAPPED_ADDR was obsoleted by IPV6CTL_V6ONLY.

MFC after: 2 days
and approved by re

mdoc(7) police: Use the new .In macro for #include statements.

mdoc(7) police:

Avoid using parenthesis enclosure macros (.Pq and .Po/.Pc) with plain text.
Not only this slows down the mdoc(7) processing significantly, but it also
has an undesired (in this case) effect of disabling hyphenation within the
entire enclosed block.

Grammar: 'effect' is a noun and 'affect' is a verb.

Removed whitespace at end-of-line; no content changes. I simply did
cd src/share; find man[1-9] -type f|xargs perl -pi -e 's/[ \t]+$//'

BTW, what editors are the culprits? I'm using vim and it shows
me whitespace at EOL in troff files with a thick blue block...

Reviewed by: Silence from cvs diff -b
MFC after: 7 days

Sync with recent KAME.
This work was based on kame-20010528-freebsd43-snap.tgz and some
critical problem after the snap was out were fixed.
There are many many changes since last KAME merge.

TODO:
- The definitions of SADB_* in sys/net/pfkeyv2.h are still different
from RFC2407/IANA assignment because of binary compatibility
issue. It should be fixed under 5-CURRENT.
- ip6po_m member of struct ip6_pktopts is no longer used. But, it
is still there because of binary compatibility issue. It should
be removed under 5-CURRENT.

Reviewed by: itojun
Obtained from: KAME
MFC after: 3 weeks

mdoc(7) police: use the new features of the Nm macro.

sync with latest kame doc. wording changes and updates

Wording fixes and mdoc fixes.

Submitted by: sheldonh
Reviewed by: sheldonh

Import from KAME. Mainly, IPv6 sysctl mib values related update.

Obtained from: KAME project

1) Merge some text in from recent KAME distributions concerning
the syntax of scoped addresses.

2) Fix typos and grammatical nitpicks.

PR: 17082
Submitted by: Bruce A. Mah <bmah@eisenhower.ca.sandia.gov>

Change .Os macro to an empty one to denote that the KAME files are
not FreeBSD specific.

Made happy: sheldonh

libipsec and IPsec related apps. (and some KAME related man pages)

Reviewed by: freebsd-arch, cvs-committers
Obtained from: KAME project