Add LLE event handler to report ND6 events to userland via rtsock.

Obtained from: Yandex LLC
MFC after: 2 weeks
Sponsored by: Yandex LLC

Catch up with HEAD (r280229-r284686).

Merge from head

Merge ^/head r283596 through r283770.

Move RTM announces into generic code to be independent from Layer2 code.
This fixes bug introduced in 274988, when announces about new addresses
don't sent for tunneling interfaces.

Reported by: tue

Move RTM announces into generic code to be independent from Layer2 code.
This fixes bug introduced in 274988, when announces about new addresses
don't sent for tunneling interfaces.

Reported by: tuexen@
MFC after: 1 week

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Merge sync of head

MFH: r282315-r282534

Sponsored by: The FreeBSD Foundation

Merge from head

Remove #ifdef IFT_FOO.

Submitted by: Guy Yur <guyyur gmail.com>

MFH: r280643-r281852

Sponsored by: The FreeBSD Foundation

Fix a possible refcount leak in regen_tmpaddr().

public_ifa6 may be set to NULL after taking a reference to a previous
address list element. Instead, only take the reference after leaving the
loop b

Fix a possible refcount leak in regen_tmpaddr().

public_ifa6 may be set to NULL after taking a reference to a previous
address list element. Instead, only take the reference after leaving the
loop but before releasing the address list lock.

Differential Revision: https://reviews.freebsd.org/D2253
Reviewed by: ae
MFC after: 2 weeks

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MFH: r278968-r280640

Sponsored by: The FreeBSD Foundation

Merge from head

Merge ^/head r279313 through r279595.

Merge r279515 through r279554 (mainly to get r279554 in this branch).

Implement Enhanced DAD algorithm for IPv6 described in
draft-ietf-6man-enhanced-dad-13.

This basically adds a random nonce option (RFC 3971) to NS messages
for DAD probe to detect a looped back pack

Implement Enhanced DAD algorithm for IPv6 described in
draft-ietf-6man-enhanced-dad-13.

This basically adds a random nonce option (RFC 3971) to NS messages
for DAD probe to detect a looped back packet. This looped back packet
prevented DAD on some pseudo-interfaces which aggregates multiple L2 links
such as lagg(4).

The length of the nonce is set to 6 bytes. This algorithm can be disabled by
setting net.inet6.ip6.dad_enhanced sysctl to 0 in a per-vnet basis.

Reported by: hiren
Reviewed by: ae
Differential Revision: https://reviews.freebsd.org/D1835

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Merge from HEAD

MFH: r278202,r278205-r278590

Sponsored by: The FreeBSD Foundation

Merge ^/head r278351 through r278498.

This fixes a bug in the way that the LLE timers for nd6
and arp were being used. They basically would pass in the
mutex to the callout_init. Because they used this method
to the callout system, it wa

This fixes a bug in the way that the LLE timers for nd6
and arp were being used. They basically would pass in the
mutex to the callout_init. Because they used this method
to the callout system, it was possible to "stop" the callout.
When flushing the table and you stopped the running callout, the
callout_stop code would return 1 indicating that it was going
to stop the callout (that was about to run on the callout_wheel blocked
by the function calling the stop). Now when 1 was returned, it would
lower the reference count one extra time for the stopped timer, then
a few lines later delete the memory. Of course the callout_wheel was
stuck in the lock code and would then crash since it was accessing
freed memory. By using callout_init(c, 1) we always get a 0 back
and the reference counting bug does not rear its head. We do have
to make a few adjustments to the callouts themselves though to make
sure it does the proper thing if rescheduled as well as gets the lock.

Commented upon by hiren and sbruno
See Phabricator D1777 for more details.

Commented upon by hiren and sbruno
Reviewed by: adrian, jhb and bz
Sponsored by: Netflix Inc.

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MFhead @ r277403

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

* Deal with ARCNET L2 multicast mapping for IPv6 the same way as in IPv4:
handle it in arc_output() instead of nd6_storelladdr().
* Remove IFT_ARCNET check from arpresolve() since arc_output() does

* Deal with ARCNET L2 multicast mapping for IPv6 the same way as in IPv4:
handle it in arc_output() instead of nd6_storelladdr().
* Remove IFT_ARCNET check from arpresolve() since arc_output() does not
use arpresolve() to handle broadcast/multicast. This check was there
since r84931. It looks like it was not used since r89099 (initial
import of Arcnet support where multicast is handled separately).
* Remove IFT_IEEE1394 case from nd6_storelladdr() since firewire_output()
calles nd6_storelladdr() for unicast addresses only.
* Remove IFT_ARCNET case from nd6_storelladdr() since arc_output() now
handles multicast by itself.

As a result, we have the following pattern: all non-ethernet-style
media have their own multicast map handling inside their appropriate
routines. On the other hand, arpresolve() (and nd6_storelladdr()) which
meant to be 'generic' ones de-facto handles ethernet-only multicast maps.

MFC after: 3 weeks

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Add forgotten definition for nd6_output_ifp().