man: Remove references to classful networks

Update wording in manual pages to replace references to classful networks with
CIDR notation.

Approved by: glebius, dhw
Sponsored by: Netflix
Differentia

man: Remove references to classful networks

Update wording in manual pages to replace references to classful networks with
CIDR notation.

Approved by: glebius, dhw
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D48853

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libalias: Add support for EIM NAT

Add support for endpoint-independent mapping ("full cone NAT") in
Libalias's UDP NAT.

This conforms to RFC 4787 requirements 1 and 3. All UDP packets sent out from

libalias: Add support for EIM NAT

Add support for endpoint-independent mapping ("full cone NAT") in
Libalias's UDP NAT.

This conforms to RFC 4787 requirements 1 and 3. All UDP packets sent out from a
particular internal address:port leave via the same NAT address:port,
regardless of their destination.

Add some libalias tests and supporting defines.

Reviewed by: igoro, thj
Differential Revision: https://reviews.freebsd.org/D46689D

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sys: Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

libalias: Remove unused function LibAliasCheckNewLink

The functionality to detect a newly created link after processing a
single packet is decoupled from the packet processing. Every new
packet is

libalias: Remove unused function LibAliasCheckNewLink

The functionality to detect a newly created link after processing a
single packet is decoupled from the packet processing. Every new
packet is processed asynchronously and will reset the indicator, hence
the function is unusable. I made a Google search for third party code,
which uses the function, and failed to find one.

That's why the function should be removed: It unusable and unused.
A much simplified API/ABI will remain in anything below 14.

Discussed with: kp
Reviewed by: manpages (bcr)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D30275

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libalias: Fix -Wcast-align compiler warnings

This fixes -Wcast-align warnings caused by the underaligned `struct ip`.
This also silences them in the public functions by changing the function
signatu

libalias: Fix -Wcast-align compiler warnings

This fixes -Wcast-align warnings caused by the underaligned `struct ip`.
This also silences them in the public functions by changing the function
signature from char * to void *. This is source and binary compatible and
avoids the -Wcast-align warning.

Reviewed By: ae, gbe (manpages)
Differential Revision: https://reviews.freebsd.org/D27882

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libalias: retire cuseeme support

The CU-SeeMe videoconferencing client and associated protocol is at this
point a historical artifact; there is no need to retain support for this
protocol today.

Re

libalias: retire cuseeme support

The CU-SeeMe videoconferencing client and associated protocol is at this
point a historical artifact; there is no need to retain support for this
protocol today.

Reviewed by: philip, markj, allanjude
Relnotes: Yes
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D24790

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Merge ^/head r356931 through r357118.

Add support for RFC 6598/Carrier Grade NAT subnets. to libalias and ipfw.

In libalias, a new flag PKT_ALIAS_UNREGISTERED_RFC6598 is added.
This is like PKT_ALIAS_UNREGISTERED_ONLY, but also is RFC

Add support for RFC 6598/Carrier Grade NAT subnets. to libalias and ipfw.

In libalias, a new flag PKT_ALIAS_UNREGISTERED_RFC6598 is added.
This is like PKT_ALIAS_UNREGISTERED_ONLY, but also is RFC 6598 aware.
Also, we add a new NAT option to ipfw called unreg_cgn, which is like
unreg_only, but also is RFC 6598-aware. The reason for the new
flags/options is to avoid breaking existing networks, especially those
which rely on RFC 6598 as an external address.

Submitted by: Neel Chauhan <neel AT neelc DOT org>
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D22877

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sys/net*: minor spelling fixes.

No functional change.

Catch up with HEAD (r280229-r284686).

Merge sync of head

Merge from head

MFH: r281855-r282312

Sponsored by: The FreeBSD Foundation

mdoc: fix rendering issues

MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

Merge head up to r262222 (last merge was incomplete).

Cleanup alias module handler register/unregister.

- Remove locking, since all module(9) events are running under &Giant.
- Use TAILQ for protocol handlers and fix a bug which led to
infinite cycle

Cleanup alias module handler register/unregister.

- Remove locking, since all module(9) events are running under &Giant.
- Use TAILQ for protocol handlers and fix a bug which led to
infinite cycle. Bug found in VirtualBox [1]
- Simplify code everywhere.
- Fix documentation.

[1] https://www.virtualbox.org/pipermail/vbox-dev/2013-November/011936.html

PR: 183792 [1]
Submitted by: Valery Ushakov <uwe NetBSD.org> [1]
Sponsored by: Nginx, Inc.

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Merge fresh head.

IFC @247348.

Sync with HEAD.

- Move AUTHORS and ACKNOWLEDGEMENTS to the end of the page.
- Add myself to list of authors.

Sync from head

Merge head r236710 through r238467.