Merge ^/head r284737 through r285152.

Keep IPv6 address specified by IPV6_PKTINFO socket option in kernel
internal form to be able handle link-local IPv6 addresses.

Reported by: kp
Tested by: kp

Catch up with HEAD (r280229-r284686).

Merge sync of head

Merge from HEAD

Mark data checksum as valid for multicast packets, that we send back
to myself via simloop.
Also remove duplicate check under #ifdef DIAGNOSTIC.

PR: 180065
MFC after: 1 week

MFH: r280643-r281852

Sponsored by: The FreeBSD Foundation

Merge from HEAD

Preserve IPv6 fragment IDs accross reassembly and refragmentation

When forwarding fragmented IPv6 packets and filtering with PF we
reassemble and refragment. That means we generate new fragment head

Preserve IPv6 fragment IDs accross reassembly and refragmentation

When forwarding fragmented IPv6 packets and filtering with PF we
reassemble and refragment. That means we generate new fragment headers
and a new fragment ID.

We already save the fragment IDs so we can do the reassembly so it's
straightforward to apply the incoming fragment ID on the refragmented
packets.

Differential Revision: https://reviews.freebsd.org/D2188
Approved by: gnn (mentor)

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MFH: r278968-r280640

Sponsored by: The FreeBSD Foundation

Merge r278538 through r279716.

Merge from head

Merge ^/head r279313 through r279595.

Fix deadlock in IPv6 PCB code.

When several threads are trying to send datagram to the same destination,
but fragmentation is disabled and datagram size exceeds link MTU,
ip6_output() calls pfctlinp

Fix deadlock in IPv6 PCB code.

When several threads are trying to send datagram to the same destination,
but fragmentation is disabled and datagram size exceeds link MTU,
ip6_output() calls pfctlinput2(PRC_MSGSIZE). It does notify all
sockets wanted to know MTU to this destination. And since all threads
hold PCB lock while sending, taking the lock for each PCB in the
in6_pcbnotify() leads to deadlock.

RFC 3542 p.11.3 suggests notify all application wanted to receive
IPV6_PATHMTU ancillary data for each ICMPv6 packet too big message.
But it doesn't require this, when we don't receive ICMPv6 message.

Change ip6_notify_pmtu() function to be able use it directly from
ip6_output() to notify only one socket, and to notify all sockets
when ICMPv6 packet too big message received.

PR: 197059
Differential Revision: https://reviews.freebsd.org/D1949
Reviewed by: no objection from #network
Obtained from: Yandex LLC
MFC after: 1 week
Sponsored by: Yandex LLC

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Merge r278538 through r279514.

MFH: r278593-r278966

Sponsored by: The FreeBSD Foundation

Merge ^/head r278756 through r278915.

Factor out ip6_fragment() function, to be used in IPv6 stack and pf(4).

Submitted by: Kristof Provost
Differential Revision: D1766

Move ip6_deletefraghdr() to frag6.c.

Suggested by: bz

Factor out ip6_deletefraghdr() function, to be shared between IPv6
stack and pf(4).

Submitted by: Kristof Provost
Reviewed by: ae
Differential Revision: D1764

Merge ^/head r277327 through r277718.

MFhead @ r277403

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Refactor / restructure the RSS code into generic, IPv4 and IPv6 specific
bits.

The motivation here is to eventually teach netisr and potentially
other networking subsystems a bit more about how RSS

Refactor / restructure the RSS code into generic, IPv4 and IPv6 specific
bits.

The motivation here is to eventually teach netisr and potentially
other networking subsystems a bit more about how RSS work queues / buckets
are configured so things have a hope of auto-configuring in the future.

* net/rss_config.[ch] takes care of the generic bits for doing
configuration, hash function selection, etc;
* topelitz.[ch] is now in net/ rather than netinet/;
* (and would be in libkern if it didn't directly include RSS_KEYSIZE;
that's a later thing to fix up.)
* netinet/in_rss.[ch] now just contains the IPv4 specific methods;
* and netinet/in6_rss.[ch] now just contains the IPv6 specific methods.

This should have no functional impact on anyone currently using
the RSS support.

Differential Revision: D1383
Reviewed by: gnn, jfv (intel driver bits)

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Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation