ip6(4): Fix copy-paste; ip6 is subnode of inet6, not inet

Bump date.

branches: 1.34.6; 1.34.8;
Improve BINDANY formatting.

Remove superfluous Pp.

Add IP_BINDANY, IPV6_BINDANY which can be used to bind to any address in
order to implement transparent proxies.

Remove workaround for ancient HTML generation code.

branches: 1.30.24;
moved to portalgo.h

PR/46602: Move the rfc6056 port randomization to the IP layer.

branches: 1.28.4;
Fix some typos and incorrect idioms with the cmsg botch^WAPI.

Add a couple cross-references too.

ok wiz

"must instead be used" -> "must be used instead"

Never use "utilize". It means exactly the same thing as "use", but it
is longer and more cumbersome. It can always be replaced with "use"
without any change in meaning.

running in emulated wizd mode, convert caddr_t to void *.

Use HTML escapes.

Bump date for previous.

Add rudimentary documentation for IPSec socket options. Maybe
somebody who groks IPSec will help me out here.

u_intN_t -> uintN_t

replace with written-from-scratch manpage. (fixes ISOC copyright issue)

revert previous change while discussion is in progress

RFC cannot be used as manpage regarding to the ISOC copyright boilerplate.
remove it until someone writes it up from scratch/freely-redistributable
text is found.

Fix typo: setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, ...)
takes a u_int argument, not a u_char argument.

Consistently use 'RFC 1234' instead of 'RFC1234' or 'RFC-1234'.
From jmc@openbsd.

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

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

Add Ns.

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.

net.inet6.ip6.bindv6only was renamed net.inet6.ip6.v6only, from Stoned
Elipot in PR 18463.
While here: New sentence, new line; \- for minus signs.

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

Grammar and punctuation fixes.

implement IPV6_V6ONLY socket option from draft-ietf-ipngwg-rfc2553bis-03.txt.
IPV6_BINDV6ONLY (netbsd only) is deprecated, but still work just like before.

Sort SEE ALSO, sort sections, drop some .Pp, and improve markup in some
places.

Typos/whitespace/punctuation.

sync with header file change. s/u_int/unsigned int/

branches: 1.5.2;
typo; duplicated verb

document IPV6_PORTRANGE.

make IPV6_BINDV6ONLY setsockopt available. it controls behavior of
AF_INET6 wildcard listening socket. heavily documented in ip6(4).
net.inet6.ip6.bindv6only defines default value. default is 1.

"options INET6_BINDV6ONLY" removes any code fragment that supports
IPV6_BINDV6ONLY == 0 case (not defopt'ed as use of this is rare).

branches: 1.2.2;
wording fixes. sync with reality.
(sync with kame tree)

add ip6(4) and icmp6(4).