MFC r294995:
Always look in the TCP pool.
This fixes issues with a restarting peer when the listening
1-to-1 style socket is closed.

MFC r295021:
Remove debug output which was committed by accident.
Thanks to Oliver Pinter for reporting.

MFC r295069:
Ignore peer addresses in a consistent way also when checking for
new addresses during restart. If this is not done, restart doesn't
work when the local socket is IPv4 only and the peer uses
IPv4 and IPv6 addresses.

MFC r295070:
Don't change the remote UDP encapsulation port for SCTP packets
containing an INIT chunk.

MFC r295072:
Don't allow a remote encapsulation port change during the
SCTP restart procedure.

MFC r295075:
Update the path mtu when turning on/off UDP encapsulation for SCTP.

MFC r295077:
Add missing parentheses. This was reported by ccaughie via GitHub
for the userland stack.

Approved by: re (kib)

MFC r285837, r285838
Fix an issue with MAC OS locking and also optimize the case
where we are sending back a stream-reset and a sack timer is running, in
that case we should just send the SACK.
Fix silly syntax error emacs chugged in for me.. gesh.

MFC r285792:
Fix several problems with Stream Reset.
1) We were not handling (or sending) the IN_PROGRESS case if
the other side (or our side) was not able to reset (awaiting more data).
2) We would improperly send a stream-reset when we should not. Not
waiting until the TSN had been assigned when data was inqueue.

MFC r284515:
Add FIB support for SCTP.
This fixes https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200379

PR: 200379

MFC r272751:
Ensure that the list of streams sent in a stream reset parameter fits
in an mbuf-cluster.
Thanks to Peter Bostroem for drawing my attention to this part of the code.

MFC r284515:
Add FIB support for SCTP.
This fixes https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200379

PR: 200379

MFC r272751:
Ensure that the list of streams sent in a stream reset parameter fits
in an mbuf-cluster.
Thanks to Peter Bostroem for drawing my attention to this part of the code.