rc.conf.5: Document the missing dhclient_flags_<interface>

This interface-specific dhclient(8) flags variable is supported by the
rc script, but was missing in the man page.

Obtained-from: FreeBSD

wg.conf.5: Fix a typo (in-inline comments are *not* allowed)

acpi: Narrow workaround for broken interrupt settings

Commit ad52dd3206 ("Sync acpi_resource with FreeBSD") introduced a
workaround for some broken BIOSes that specified active-lo instead of
active-

acpi: Narrow workaround for broken interrupt settings

Commit ad52dd3206 ("Sync acpi_resource with FreeBSD") introduced a
workaround for some broken BIOSes that specified active-lo instead of
active-hi polarity for ISA IRQs for UARTs. The workaround assumed that
edge-sensitive ISA IRQs on x86 should always be active-hi. However,
some recent AMD systems actually use active-lo edge-sensitive ISA IRQs
(and not just for UARTs, but also for the keyboard and PS/2 mouse
devices) and the override causes interrupts to be dropped resulting in
boot time hangs, non-working keyboards, etc.

Add a hw.acpi.override_isa_irq_polarity tunable (readable as a sysctl
post-boot) to control this quirk. It can be set to 1 to force enable
the override and 0 to disable it. The log of FreeBSD-PR (see below)
mentions an Intel motherboard as the sample case, so default the
tunable to 1 on systems with an Intel CPU and 0 otherwise.

Special thanks to Matthias Lanter <freebsd@lanter-it.ch> for tracking
down boot time issues on recent AMD systems to mismatched interrupt
polarity.

Taken-from: FreeBSD [1]

FreeBSD-PR: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270707

[1]: https://github.com/freebsd/freebsd-src/commit/0a34d050ae8ea14feddd3d2a62fd2f612613b2c5

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rc.conf: Add and document the missing root_rw_mount=YES

The 'root_rw_mount' variable was missing, and it caused the rc.d/root
script to always ignore the 'mount -u -o rw /' command. Nevertheless,
t

rc.conf: Add and document the missing root_rw_mount=YES

The 'root_rw_mount' variable was missing, and it caused the rc.d/root
script to always ignore the 'mount -u -o rw /' command. Nevertheless,
the '/' root filesystem was still remounted to be 'rw' because the later
'mount -a' command, according to /etc/fstab.

With this 'root_rw_mount=YES' placed, the '/' entry should now be
optional in /etc/fstab because the '/' root filesystem can be correctly
remounted to be 'rw'.

Obtained-from: FreeBSD (commit 6e1b226)
Reported-by: robstinge (IRC)

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bridge(4): document net.link.bridge.pfil_onlyip

Explain what it does and give the example that disabling it
allows PPPoE traffic.

Important when you want to serve PPPoE to your VMs.

procfs(5): Update man page for the previous change

netinet6: Improve flexibility of receiving Router Advertisement

Convert the sysctl 'net.inet6.ip6.accept_rtadv' to be the default value
of the per-interface flag 'ND6_IFF_ACCEPT_RTADV', making it no

netinet6: Improve flexibility of receiving Router Advertisement

Convert the sysctl 'net.inet6.ip6.accept_rtadv' to be the default value
of the per-interface flag 'ND6_IFF_ACCEPT_RTADV', making it no longer a
global knob. Now the receiving RA is allowed if ip6_forwarding==0 *and*
'ND6_IFF_ACCEPT_RTADV' is set on that interface.

ndp(8) already supports to toggle the 'ND6_IFF_ACCEPT_RTADV' flag via
the 'accept_rtadv' option.

Derived from FreeBSD.

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netinet6: Improve handling of auto link-local address configuration

Add a new per-interface flag 'ND6_IFF_AUTO_LINKLOCAL' and convert the
sysctl 'net.inet6.ip6.auto_linklocal' to be the default valu

netinet6: Improve handling of auto link-local address configuration

Add a new per-interface flag 'ND6_IFF_AUTO_LINKLOCAL' and convert the
sysctl 'net.inet6.ip6.auto_linklocal' to be the default value of this
new per-interface flag. This allows to fine control the automatic
link-local address configuration on a per-interface basis.

Update ndp(8) to support to toggle the 'ND6_IFF_AUTO_LINKLOCAL' flag by
adding the 'auto_linklocal' option.

Document the 'IPV6CTL_AUTO_LINKLOCAL' option in the inet6(4) man page.

Derived from FreeBSD.

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rc.d: Add FILESYSTEMS dummy dependency

This dummy dependency ensures that root and other critical local file
systems are mounted. One of the intentions to add this dummy dependency
is to fix the wa

rc.d: Add FILESYSTEMS dummy dependency

This dummy dependency ensures that root and other critical local file
systems are mounted. One of the intentions to add this dummy dependency
is to fix the warnings caused by some ports' rc script wrongly dependent
on this script.

Update the rc.8 man page; meanwhile, tweak the description of other
dummy dependencies a bit.

Updating existing rc scripts to make use of FILESYSTEMS is coming in
another commit.

Obtained-from: FreeBSD

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wg: Write rc(8) script to easily manage wg(4) interfaces

This "wg" rc(8) script is somewhat similar to the "wg-quick" tool on
Linux/FreeBSD. It can be used to quickly start/stop the wg(4)
interface

wg: Write rc(8) script to easily manage wg(4) interfaces

This "wg" rc(8) script is somewhat similar to the "wg-quick" tool on
Linux/FreeBSD. It can be used to quickly start/stop the wg(4)
interfaces according to the wg.conf(5) configuration files in the
"/etc/wireguard" directory.

The syntax of wg.conf(5) configuration file is very similar to that
of "wg-quick" but with necessary changes and minor additions. See
wg.conf(5) for details.

On the one hand, the new "wg_enable" and "wg_interfaces" variables in
"/etc/rc.conf" can be used to auto-configure the wg(4) interfaces during
the system startup. See rc.conf(5) for more details.

On the other hand, this "wg" script can be manually called from the
command-line to start/stop the wg(4) interfaces.

Thanks to swildner for reviewing the man page.

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rc.conf.5: Reorder "rc_conf_files" to group "rc_*" variables

wg: Hook to the build system

wg: Adapt the man page to match our version

wg: Import from FreeBSD without any modifications

From FreeBSD main branch as of 2023-09-19.

Kernel module/driver:
- sys/dev/wg/compat.h
- sys/dev/wg/crypto.h
- sys/dev/wg/if_wg.c
- sys/dev/wg/if_w

wg: Import from FreeBSD without any modifications

From FreeBSD main branch as of 2023-09-19.

Kernel module/driver:
- sys/dev/wg/compat.h
- sys/dev/wg/crypto.h
- sys/dev/wg/if_wg.c
- sys/dev/wg/if_wg.h
- sys/dev/wg/version.h
- sys/dev/wg/wg_cookie.c
- sys/dev/wg/wg_cookie.h
- sys/dev/wg/wg_crypto.c
- sys/dev/wg/wg_noise.c
- sys/dev/wg/wg_noise.h

Module makefile:
- sys/modules/if_wg/Makefile

Man page:
- share/man/man4/wg.4

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lo.4: Describe RXCSUM/TXCSUM support, other minor updates

The RXCSUM/TXCSUM support was added in commit 72662a by sephe. Update
the man page to describe it. Meanwhile, add some other minor updates

lo.4: Describe RXCSUM/TXCSUM support, other minor updates

The RXCSUM/TXCSUM support was added in commit 72662a by sephe. Update
the man page to describe it. Meanwhile, add some other minor updates
from FreeBSD.

Obtained-from: FreeBSD

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lock.9: Minor markup improvements

Meanwhile, tweak a wording a bit.

objcache.9: Add ctor/dtor/alloc/free function typedefs to SYNOPSIS

Also add the 'objcache_malloc_args' struct definition.

objcache.9: Improve one markup

objcache.9: Use 'destructor' instead of 'deconstructor'

Well, the 'destructor' is now the most common terminology in
programming.

gif.4: Remove one duplicate "be" word

atomic.9: Some small updates

- Add some more description obtained from FreeBSD.
- Uncomment the 64-bit variant contents.
- Minor wording tweaks.

atomic(9): Add relaxed load/store variants from FreeBSD

Obtained from FreeBSD. However, the original atomic_store_ptr() macro
was causing '-Wcast-qual' warnings, so I changed it based on the
NetBSD

atomic(9): Add relaxed load/store variants from FreeBSD

Obtained from FreeBSD. However, the original atomic_store_ptr() macro
was causing '-Wcast-qual' warnings, so I changed it based on the
NetBSD's atomic_store_relaxed().

Actually, I found NetBSD's version more clean, but we import the FreeBSD
version to help import code/drivers in the future.

Discussed-with: dillon

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objcache(9): Remove the unused ocflag arg from objcache_reclaimlist()

mbuf(9): Various minor updates and style cleanups

- Fix the comment that MSIZE/MCLBYTES is defined in <sys/param.h>
instead of <machine/param.h>; update the man page accordingly.
- Adjust some typ

mbuf(9): Various minor updates and style cleanups

- Fix the comment that MSIZE/MCLBYTES is defined in <sys/param.h>
instead of <machine/param.h>; update the man page accordingly.
- Adjust some type casts in mtod() to be more consistent.
- Add the '__unused' attribute to actually unused parameters.
- Remove unused NCL_INIT/NMB_INIT macros from 'uipc_mbuf.c'.
- Use '__func__' instead of hard-coding function names.
- Fix several typos.
- Various style cleanups, mainly whitesapce adjustments.

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mbuf(9): Use 'void *' in several public APIs to save casts in callers

Update the following public APIs to use 'void *' or 'const void *'
instead of 'caddr_t'/'c_caddr_t'/'char *', so that callers no

mbuf(9): Use 'void *' in several public APIs to save casts in callers

Update the following public APIs to use 'void *' or 'const void *'
instead of 'caddr_t'/'c_caddr_t'/'char *', so that callers no longer
need to do explicit casts:

- m_append()
- m_copyback()
- m_copyback2()
- m_copydata()
- m_devget()
- m_extadd()

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