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

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

keysock: do not use raw socket code

This makes key socket implementation self contained and removes one
of the last dependencies on the raw socket code and pr_output method.

There are very subtle A

keysock: do not use raw socket code

This makes key socket implementation self contained and removes one
of the last dependencies on the raw socket code and pr_output method.

There are very subtle API visible changes:
- now key socket would return EOPNOTSUPP instead of EINVAL on
syscalls that are not supposed to be called on a key socket.
- key socket buffer sizes are now controlled by net.key sysctls instead
of net.raw. The latter were not documented anywhere, and even Internet
search doesn't find any references or discussions related to them.

Reviewed by: melifaro
Differential revision: https://reviews.freebsd.org/D36123

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Remove obsoleted and unused key_sendup() function.
Also remove declaration for nonexistend key_usrreq() function.

MFC after: 2 weeks

Merge ^/head r325999 through r326131.

sys: 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

sys: 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 sync of head

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

MFhead @ r275496

Merge ^/head r275387 through r275477.

Remove __P() macro.

Suggested by: kevlo
Sponsored by: Yandex LLC

Merge from head@274682

IFC @r271694

Sync to HEAD@r270409.

Change pr_output's prototype to avoid the need for explicit casts.
This is a follow up to r269699.

Phabric: D564
Reviewed by: jhb

Merge head r233826 through r256722.

Merge from head

IFC @ r254014

IFC @ r253461

IFC @253398

Migrate structs ahstat, espstat, ipcompstat, ipipstat, pfkeystat,
ipsec4stat, ipsec6stat to PCPU counters.

Prepare network statistics structures for migration to PCPU counters.
Use uint64_t as type for all fields of structures.

Changed structures: ahstat, arpstat, espstat, icmp6_ifstat, icmp6stat,
in6_if

Prepare network statistics structures for migration to PCPU counters.
Use uint64_t as type for all fields of structures.

Changed structures: ahstat, arpstat, espstat, icmp6_ifstat, icmp6stat,
in6_ifstat, ip6stat, ipcompstat, ipipstat, ipsecstat, mrt6stat, mrtstat,
pfkeystat, pim6stat, pimstat, rip6stat, udpstat.

Discussed with: arch@

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IFC @ r252047

Use corresponding macros to update statistics for AH, ESP, IPIP, IPCOMP,
PFKEY.

MFC after: 2 weeks

Merge from head