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

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

gif(4): Revert in{,6}_gif_output() misalignment handling

The code added in c89c8a1029860182eece5d51ec09119b9500e5a1 in order
to compensate possible misalignment caused by prepending the IP4/6
header

gif(4): Revert in{,6}_gif_output() misalignment handling

The code added in c89c8a1029860182eece5d51ec09119b9500e5a1 in order
to compensate possible misalignment caused by prepending the IP4/6
header with an EtherIP one got broken at some point by a rewrite of
gif(4). For better or worse, 8018ac153f7671699ca008f31c0fad9caef2f531
relaxed the alignment of struct ip from 32 bit to 16 bit, though. As
a result, a 16 bit offset of the IPv4 header induced by the addition
of the 16 bit EtherIP one no longer is a problem in the first place.
The alignment of struct ip6_hdr currently is even only 8 bit, making
it even less problematic with regards to possible misalignment.
Thus, remove the code for handling misalignment in in{,6}_gif_output()
altogether again.
While at it, replace the 3 bcopy(9) calls in gif(4) with memcpy(9) as
there's no need to handle overlap here.

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gif_transmit() must always be called in the network epoch.

Merge ^/head r339015 through r339669.

Add handling for appearing/disappearing of ingress addresses to if_gif(4).

* register handler for ingress address appearing/disappearing;
* add new srcaddr hash table for fast softc lookup by srcadd

Add handling for appearing/disappearing of ingress addresses to if_gif(4).

* register handler for ingress address appearing/disappearing;
* add new srcaddr hash table for fast softc lookup by srcaddr;
* when srcaddr disappears, clear IFF_DRV_RUNNING flag from interface,
and set it otherwise;
* remove the note about ingress address from BUGS section.

MFC after: 1 month
Sponsored by: Yandex LLC
Differential Revision: https://reviews.freebsd.org/D17134

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epoch(9): allow preemptible epochs to compose

- Add tracker argument to preemptible epochs
- Inline epoch read path in kernel and tied modules
- Change in_epoch to take an epoch as argument
- Simpli

epoch(9): allow preemptible epochs to compose

- Add tracker argument to preemptible epochs
- Inline epoch read path in kernel and tied modules
- Change in_epoch to take an epoch as argument
- Simplify tfb_tcp_do_segment to not take a ti_locked argument,
there's no longer any benefit to dropping the pcbinfo lock
and trying to do so just adds an error prone branchfest to
these functions
- Remove cases of same function recursion on the epoch as
recursing is no longer free.
- Remove the the TAILQ_ENTRY and epoch_section from struct
thread as the tracker field is now stack or heap allocated
as appropriate.

Tested by: pho and Limelight Networks
Reviewed by: kbowling at llnw dot com
Sponsored by: Limelight Networks
Differential Revision: https://reviews.freebsd.org/D16066

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Rework if_gif(4) to use new encap_lookup_t method to speedup lookup
of needed interface when many gif interfaces are present.

Remove rmlock from gif_softc, use epoch(9) and CK_LIST instead.
Move mor

Rework if_gif(4) to use new encap_lookup_t method to speedup lookup
of needed interface when many gif interfaces are present.

Remove rmlock from gif_softc, use epoch(9) and CK_LIST instead.
Move more AF-related code into AF-related locations.
Use hash table to speedup lookup of needed softc. Interfaces
with GIF_IGNORE_SOURCE flag are stored in plain CK_LIST.
Sysctl net.link.gif.parallel_tunnels is removed. The removal was planed
16 years ago, and actually it could work only for outbound direction.
Each protocol, that can be handled by if_gif(4) interface is registered
by separate encap handler, this helps avoid invoking the handler
for unrelated protocols (GRE, PIM, etc.).

This change allows dramatically improve performance when many gif(4)
interfaces are used.

Sponsored by: Yandex LLC

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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 from head

Sponsored by: Gandi.net

Merge from head

Sync up with head (up to r288341).

Finish merging from head, messed up in previous attempt

Merge ^/head r287527 through r287679.

- Remove GIF_{SEND,ACCEPT}_REVETHIP.
- Simplify EADDRNOTAVAIL and EAFNOSUPPORT conditions.

MFC after: 3 days

Catch up with HEAD (r280229-r284686).

MFH: r282615-r283655

Sponsored by: The FreeBSD Foundation

Merge sync of head

Add an ability accept encapsulated packets from different sources by one
gif(4) interface. Add new option "ignore_source" for gif(4) interface.
When it is enabled, gif's encapcheck function requires

Add an ability accept encapsulated packets from different sources by one
gif(4) interface. Add new option "ignore_source" for gif(4) interface.
When it is enabled, gif's encapcheck function requires match only for
packet's destination address.

Differential Revision: https://reviews.freebsd.org/D2004
Obtained from: Yandex LLC
MFC after: 2 weeks
Sponsored by: Yandex LLC

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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

Move the recursion detection code into separate function gif_check_nesting().
Also make MTAG_GIF definition private to if_gif.c.

MFC after: 1 week

MFhead @ r276594

Merge ^/head r274961 through r276301.