sctp: cleanup cdefs.h include

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

sctp: use constants from RFC 8260 to improve compliance

Keep the old constants for backwards compatibility.

MFC after: 1 week

sctp: fix typos

Thanks to David Sanders for fixing the typos in the userland stack.

MFC after: 3 days

sctp: get rid of stcb send lock

Just use the stcb lock instead to simplify locking.

Reported by: syzbot+d00b202063150f85b110@syzkaller.appspotmail.com
Reported by: syzbot+87f268a0a6d2d6383306@syzkaller.appspotmail.com
MFC after: 3 days

sctp: improve KASSERT messages

MFC after: 1 week

sctp: don't keep being locked on a stream which is removed

Reported by: syzbot+f5f551e8a3a0302a4914@syzkaller.appspotmail.com
MFC after: 1 week

sctp: provide a specific stream scheduler function for FCFS

A KASSERT in the genric routine does not apply and triggers
incorrectly.

Reported by: syzbot+8435af157238c6a11430@syzkaller.appspotmail.com
MFC after: 1 week

sctp: cleanup and adding KASSERT()s, no functional change

MFC after: 1 week

sctp: Cleanup stream schedulers.

No functional change intended.

MFC after: 1 week

sctp: Simplify stream scheduler usage

Callers are getting the stcb send lock, so just KASSERT that.
No need to signal this when calling stream scheduler functions.
No functional change intended.

MFC after: 1 week

sctp: fix FCFS stream scheduler

Reported by: syzbot+c6793f0f0ce698bce230@syzkaller.appspotmail.com
MFC after: 1 week

Fix a few typos in comments

- trough -> through

MFC after: 1 week

net: clean up empty lines in .c and .h files

Cleanups, no functional change.

MFC after: 1 week

Fix the non-default stream schedulers such that do not interleave
user messages when it is now allowed.

Thanks to Christian Wright for reporting the issue for the userland
stack and providing a fix for the priority scheduler.

MFC after: 1 week

Initialize scheduler specific data for the FCFS scheduler.
This is joint work with rrs@. The issue was reported by using
syzkaller.

MFC after: 1 week

Some cleanup and consistency improvements.

MFC after: 3 days

After removing an entry from the stream scheduler list, set the pointers
to NULL, since we are checking for it in case the element gets inserted
again.

This issue was found by running syzkaller.

MFC after: 3 days

Revert https://svnweb.freebsd.org/changeset/base/336503
since I also ran the export script with different parameters.

Whitespace changes due to change if ident.

Fix SPDX line as suggested by pfg

Add SPDX line.

Fix the explicit EOR mode. If the final messages is not complete, send
an ABORT.
Joint work with rrs@
MFC after: 1 week

Whitespace changes.

The toolchain for processing the sources has been updated. No functional
change.

MFC after: 3 days

Cleanup the names of SSN, SID, TSN, FSN, PPID and MID.

This made a couple of bugs visible in handling SSN wrap-arounds
when using DATA chunks. Now bulk transfer seems to work fine...
This fixes the issue reported in
https://github.com/sctplab/usrsctp/issues/111

MFC after: 1 week

Whitespace changes.

The tools using to generate the sources has been updated and produces
different whitespaces. Commit this seperately to avoid intermixing
these with real code changes.

MFC after: 3 days

Mark an unused parameter as such.

MFC after: 3 days

Fix various bugs in relation to the I-DATA chunk support

This is joint work with rrs.

MFC after: 3 days

Add const to several constants. Thanks to Nicholas Nethercote for
providing the patch via
https://bugzilla.mozilla.org/show_bug.cgi?id=1255655

MFC after: 1 week

Use consistent text at the begining of the files.

MFC after: 3 days

Address issues found by clang. While there, fix also some style
issues.

MFC after: 3 months.

Fix unused parameter warnings.
While there, fix some whitespace issues.

MFC after: 3 months.

Fix several bugs related to stream scheduling.

Obtained from: Robin Seggelmann
MFC after: 3 months.

1) Typo correction in comments and one spacing change.
2) Mass update to all copyrights.
MFC after: 3 Months

Fix several bugs in the stream schedulers.
From Robin Seggelmann.

MFC after: 3 months.

Add stream scheduling support.
This work is based on a patch received from Robin Seggelmann.

MFC after: 3 months.