Remove $FreeBSD$: two-line nroff pattern

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

netlink: Fix "version introduced" documentation

netlink(4) and associated features will exist in FreeBSD 14.0 but they
will also exist in 13.2, an older version, from commits such as 02b958b1
and b3

netlink: Fix "version introduced" documentation

netlink(4) and associated features will exist in FreeBSD 14.0 but they
will also exist in 13.2, an older version, from commits such as 02b958b1
and b309249b.

This commit needs merging to stable/13 and releng/13.2.

MFC after: 2days (needs to be in RC2)
Reviewed by: imp,melifaro
Pull Request: https://github.com/freebsd/freebsd-src/pull/651

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netlink: make the maximum allowed netlink socket buffer runtime tunable.

Dumping large routng tables (>1M paths with multipath) require the socket
buffer which is larger than the currently defined

netlink: make the maximum allowed netlink socket buffer runtime tunable.

Dumping large routng tables (>1M paths with multipath) require the socket
buffer which is larger than the currently defined limit.
Allow the limit to be set in runtime, similar to kern.ipc.maxsockbuf.

Reported by: Marek Zarychta <zarychtam@plan-b.pwste.edu.pl>
MFC after: 1 day

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netlink: return optional metadata with the operation result.

Some operations like interface creation may need to return metadata
- in this case, interface name - back to the caller if the operation

netlink: return optional metadata with the operation result.

Some operations like interface creation may need to return metadata
- in this case, interface name - back to the caller if the operation
is successful.
This change implements attaching an `NLMSGERR_ATTR_COOKIE` nla to the
operation reply message via `nlmsg_report_cookie()`.
Additionally, on successful interface creation, interface index and
interface name are returned in the `IFLA_NEW_IFINDEX` and `IFLA_IFNAME
TLVs, encapsulated in the `NLMSGERR_ATTR_COOKIE`.

Reviewed By: pauamma
Differential Revision: https://reviews.freebsd.org/D38283
MFC after: 1 week

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netlink: allow creating sockets with SOCK_DGRAM.

Some existing applications setup Netlink socket with
SOCK_DGRAM instead of SOCK_RAW. Update the manpage to clarify
that the default way of creating t

netlink: allow creating sockets with SOCK_DGRAM.

Some existing applications setup Netlink socket with
SOCK_DGRAM instead of SOCK_RAW. Update the manpage to clarify
that the default way of creating the socket should be with
SOCK_RAW. Update the code to support both SOCK_RAW and SOCK_DGRAM.

Reviewed By: pauamma
Differential Revision: https://reviews.freebsd.org/D38075

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netlink: fix typo in netlink(4)

Reported by: Ihor Antonov <ihor@antonovs.family>

netlink: suppress sending NLMSG_ERROR if NLMSG_DONE is already sent

Netlink has a confirmation/error reporting mechanism for the sent
messages. Kernel explicitly acks each messages if requested (NLM

netlink: suppress sending NLMSG_ERROR if NLMSG_DONE is already sent

Netlink has a confirmation/error reporting mechanism for the sent
messages. Kernel explicitly acks each messages if requested (NLM_F_ACK)
or if message processing results in an error.
Similarly, for multipart messages - typically dumps, where each message
represents a single object like an interface or a route - another
message, NLMSG_DONE is used to indicate the end of dump and the
resulting status.
As a result, successfull dump ends with both NLMSG_DONE and NLMSG_ERROR
messages.
RFC 3549 does not say anything specific about such case.
Linux adopted an optimisation which suppresses NLMSG_ERROR message
when NLMSG_DONE is already sent. Certain libraries/applications like
libnl depends on such behavior.

Suppress sending NLMSG_ERROR if NLMSG_DONE is already sent, by
setting newly-added 'suppress_ack' flag in the writer and checking
this flag when generating ack.

This change restores libnl compatibility.

Before:
```
~ nl-link-list
Error: Unable to allocate link cache: Message sequence number mismatch
````

After:
```
~ nl-link-list
vtnet0 ether 52:54:00:14:e3:19 <broadcast,multicast,up,running>
lo0 ieee1394 <loopback,multicast,up,running>
```

Reviewed by: bapt,pauamma
Tested by: bapt
Differential Revision: https://reviews.freebsd.org/D37565

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netlink: add netlink user documentation.

Add netlink(4) as a "frontend" manpage describing netlink in general.
Add rtnelink(4) describing supported commands and attributes in
NETLINK_ROUTE family.
A

netlink: add netlink user documentation.

Add netlink(4) as a "frontend" manpage describing netlink in general.
Add rtnelink(4) describing supported commands and attributes in
NETLINK_ROUTE family.
Add genetlink(4) describing generic netlink API.

Reviewed by: pauamma
Differential Revision: https://reviews.freebsd.org/D37011

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