rtadvd(8): support PREF64 (RFC 8781)

PREF64 allows a router to advertise the network's NAT64 prefix, allowing
clients to auto-configure CLAT. This makes it possible to deploy
IPv6-only or IPv6-most

rtadvd(8): support PREF64 (RFC 8781)

PREF64 allows a router to advertise the network's NAT64 prefix, allowing
clients to auto-configure CLAT. This makes it possible to deploy
IPv6-only or IPv6-mostly client access networks without the need for
DNS64.

Reviewed by: imp, glebius (prior suggetions done)
Pull Request: https://github.com/freebsd/freebsd-src/pull/1206

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rtadvd: Remove return statement at the end of void functions

Signed-off-by: Elyes Haouas <ehaouas@noos.fr>

Remove $FreeBSD$: one-line .c comment pattern

Remove /^/[*/]\s*\$FreeBSD\$.*\n/

Merge ^/head r339813 through r340125.

Update the "flag" for draft-ietf-6man-ipv6only-flag.

Having the flag named "6" can possibly be a problem for configurations
where parsing strings and numbers can produce ambivalent results.
Rename t

Update the "flag" for draft-ietf-6man-ipv6only-flag.

Having the flag named "6" can possibly be a problem for configurations
where parsing strings and numbers can produce ambivalent results.
Rename the "6" flag to the "S"ix (or Silence-IPv4) flag.

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Initial implementation of draft-ietf-6man-ipv6only-flag.

This change defines the RA "6" (IPv6-Only) flag which routers
may advertise, kernel logic to check if all routers on a link
have the flag set

Initial implementation of draft-ietf-6man-ipv6only-flag.

This change defines the RA "6" (IPv6-Only) flag which routers
may advertise, kernel logic to check if all routers on a link
have the flag set and accordingly update a per-interface flag.

If all routers agree that it is an IPv6-only link, ether_output_frame(),
based on the interface flag, will filter out all ETHERTYPE_IP/ARP
frames, drop them, and return EAFNOSUPPORT to upper layers.

The change also updates ndp to show the "6" flag, ifconfig to
display the IPV6_ONLY nd6 flag if set, and rtadvd to allow
announcing the flag.

Further changes to tcpdump (contrib code) are availble and will
be upstreamed.

Tested the code (slightly earlier version) with 2 FreeBSD
IPv6 routers, a FreeBSD laptop on ethernet as well as wifi,
and with Win10 and OSX clients (which did not fall over with
the "6" flag set but not understood).

We may also want to (a) implement and RX filter, and (b) over
time enahnce user space to, say, stop dhclient from running
when the interface flag is set. Also we might want to start
IPv6 before IPv4 in the future.

All the code is hidden under the EXPERIMENTAL option and not
compiled by default as the draft is a work-in-progress and
we cannot rely on the fact that IANA will assign the bits
as requested by the draft and hence they may change.

Dear 6man, you have running code.

Discussed with: Bob Hinden, Brian E Carpenter

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Merge ^/head r325999 through r326131.

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier f

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

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Merge ^/head r314129 through r314177.

rtadvd(8): double assignment.

Remove doubtful initialization since the value will be overwritten
immediately afterwards.

Found with: coccinelle (da.cocci)

Use strlcpy() instead of strncpy() when copying ifname to ensure
that it is NUL terminated. Additional NUL padding is not required
for short names.

MFC after: 1 week

rtadvd(8): Don't use-after-free

This whole block of code as committed fully formed in r224144. I'm not really
sure what the intent was, but it seems plausible that !persist ifis could need
other me

rtadvd(8): Don't use-after-free

This whole block of code as committed fully formed in r224144. I'm not really
sure what the intent was, but it seems plausible that !persist ifis could need
other member cleanup. Don't free the object until after we've finished
cleaning its members.

Reported by: Coverity
CID: 1006079
Sponsored by: EMC / Isilon Storage Division

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MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

Catch up with head (r291075).

Merge from head

Merge from head

Sponsored by: Gandi.net

- Fix a bug which prevented dnssl[0-9] and rdnss[0-9] parameters from
working.

- Fix a pointer calculation for padding when multiple dnssl[0-9]
parameters are specified [*].

Reported by: http:/

- Fix a bug which prevented dnssl[0-9] and rdnss[0-9] parameters from
working.

- Fix a pointer calculation for padding when multiple dnssl[0-9]
parameters are specified [*].

Reported by: http://bugs.dragonflybsd.org/issues/2847 [*]

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Catch up with HEAD (r280229-r284686).

Merge sync of head

Merge from head

MFH: r280643-r281852

Sponsored by: The FreeBSD Foundation

Stop including if_var.h from userland.

Sponsored by: Nginx, Inc.

Merge from head@274682

Sync to HEAD@r274095.

Reintegrate head@r273095

Sponsored by: The FreeBSD Foundation