Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

tests/netlink: add netlink socket buffer test

With upcoming protocol specific socket buffer for Netlink we need some
additional tests that cover basic socket operations, w/o much of actual
Netlink k

tests/netlink: add netlink socket buffer test

With upcoming protocol specific socket buffer for Netlink we need some
additional tests that cover basic socket operations, w/o much of actual
Netlink knowledge. Following tests are performed:

1) Overflow. If an application keeps sending messages to the kernel,
but doesn't read out the replies, then first the receive buffer shall
fill and after that further messages from applications will be queued
on the send buffer until it is filled. After that socket operations
should block. However, reading from the receive buffer some data should
wake up the taskqueue and the send buffer should start draining again.

2) Peek & trunc. Check that socket correctly reports amount of readable
data with MSG_PEEK & MSG_TRUNC. This is typical pattern of Netlink apps.

3) Sizes. Check that zero size read doesn't affect the socket, undersize
read will return one truncated message and the message is removed from
the buffer. Check that large buffer will be filled in one read, without
any boundaries imposed by internal representation of the buffer. Check
that any meaningful read is amended with control data if requested so.

Reviewed by: melifaro
Differential Revision: https://reviews.freebsd.org/D42525

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Remove $FreeBSD$: one-line sh pattern

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

netlink: use netlink mbufs in the mbuf chains.

Continue D40356 and switch the remaining parts of mbuf-related
code to the Netlink mbufs.

Reviewed By: gallatin
Differential Revision: https://reviews

netlink: use netlink mbufs in the mbuf chains.

Continue D40356 and switch the remaining parts of mbuf-related
code to the Netlink mbufs.

Reviewed By: gallatin
Differential Revision: https://reviews.freebsd.org/D40368
MFC after: 2 weeks

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netlink: improve snl(3)

Summary:
* add snl_send_message() as a convenient send wrapper
* add signed integer parsers
* add snl_read_reply_code() to simplify operation result checks
* add snl_read_rep

netlink: improve snl(3)

Summary:
* add snl_send_message() as a convenient send wrapper
* add signed integer parsers
* add snl_read_reply_code() to simplify operation result checks
* add snl_read_reply_multi() to simplify reading multipart messages
* add snl_create_genl_msg_request()
* add snl_get_genl_family() to simplify family name->id resolution
* add tests for some of the functionality

Reviewed by: kp
Differential Revision: https://reviews.freebsd.org/D39092
MFC after: 2 weeks

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tests: add more netlink tests for neighbors/routes

Differential Revision: https://reviews.freebsd.org/D38912
MFC after: 2 weeks

tests: add netlink large dump buffer check

Differential Revision: https://reviews.freebsd.org/D38665
MFC after: 2 weeks

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: improve RTM_GETADDR handling.

* Allow filtering by ifa_family & ifa_index.
* Add common RTM_<NEW|DEL|GET>ADDR parser
* Add tests verifying RTM_GETADDR filtering behaviour & output
* Factor

netlink: improve RTM_GETADDR handling.

* Allow filtering by ifa_family & ifa_index.
* Add common RTM_<NEW|DEL|GET>ADDR parser
* Add tests verifying RTM_GETADDR filtering behaviour & output
* Factor out common netlink socket test methods into NetlinkTestTemplate
* Add NLMSG_DONE message handler

Reviewed By: pauamma
Differential Revision: https://reviews.freebsd.org/D37970

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netlink: add snl(3) - simple netlink library

Reviewed by: bapt, pauamma
Differential Revision: https://reviews.freebsd.org/D37736

netlink: improve interface handling

* Separate interface creation from interface modification code
* Support setting some interface attributes (ifdescr, mtu, up/down, promisc)
* Improve interaction

netlink: improve interface handling

* Separate interface creation from interface modification code
* Support setting some interface attributes (ifdescr, mtu, up/down, promisc)
* Improve interaction with the cloners requiring to parse/write custom
interface attributes
* Add bitmask-based way of checking if the attribute is present in the
message
* Don't use multipart RTM_GETLINK replies when searching for the
specific interface names
* Use ENODEV instead of ENOENT in case of failed RTM_GETLINK search
* Add python netlink test helpers
* Add some netlink interface tests

Differential Revision: https://reviews.freebsd.org/D37668

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