sys: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

sys: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

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

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

bpf(3): Grammar fix for a source code comment

- s/that that/that the/

MFC after: 3 days

sys: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Remove register keyword from sys/ and ANSIfy prototypes

A long long time ago the register keyword told the compiler to store
the corresponding variable in a CPU register, but it is not relevant
for any compiler used in the FreeBSD world today.

ANSIfy related prototypes while here.

Reviewed by: cem, jhb
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D10193

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

Implement BPF_MOD and BPF_XOR instructions.

These two ALU instructions first appeared on Linux. Then, libpcap adopted
and made them available since 1.6.2. Now more platforms including NetBSD
have them in kernel. So do we.
--이 줄 이하는 자동으로 제거됩니다--

sys/net* : for pointers replace 0 with NULL.

Mostly cosmetical, no functional change.

Found with devel/coccinelle.

Include strings.h so that bpf_filter.c can be built in userland.

This is to bring in a definition for bzero(3), which in turn allows the
tests in tools/regression/bpf/ to build again.

Clear the filter memory area before using it. Leaving it uninitialized may
leak previous kernel stack contents through a malicioius BPF filter.

PR: kern/158880
Submitted by: Guy Harris
Obtained from: OpenBSD
MFC after: 1 week

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

- Import the HEAD csup code which is the basis for the cvsmode work.

Fix the last missing parentheses for a return statement in bpf_filter.c.

More convergence towards style(9).

- Directly match code wherever possible instead of using macros.
- Macrofy bitmap table lookup. Constify the table while I am here.
- Add missing continue statements in the for loop.

Functionally it should be the last remaining fix from:

PR: kern/89752
MFC after: 1 month

Simplify jump instruction range checks.

MFC after: 1 month

Check invalid BPF codes from bpf_validate(9).

Note that it is not critical because bpf_filter(9) returns zero
when it encounters invalid code at run time.

MFC after: 1 month

Validate scratch memory addresses for BPF_STX and BPF_LDX|BPF_MEM.
A badly written filter was able to reference invalid addresses,
even cause kernel crash.

MFC after: 3 days

Make sys/net/bpf_filter.c build cleanly on user land.

Improve convergence of bpf_filter.c toward style(9).

MFC after: 3 weeks
Submitted by: csjp

Use __FBSDID() in the kernel BPF implementation.

MFC after: 3 days

Make the type of the memory used by the BPF filter unsigned, so it
matches the BPF registers (which are the only thing that is assigned
to/from BPF memory). This is a pedantic change that shouldn't change
any behaviour.

PR: 115931
Submitted by: Matthew Luckie <mjl@luckie.org.nz>
Approved by: re (bmah)
MFC after: 3 weeks

Avoid unwanted sign extension of indexed byte load in bpf code.

PR: 89748
Submitted by: Guy Harris <guy@alum.mit.edu>
Obtained from: NetBSD via OpenBSD
MFC after: 2 weeks

Correctly check the filter length. I committed the wrong version.
Pointy hat to me.

- Explicitly validate an empty filter to match bpf_filter() comment[1].
- Do not use BPF JIT compiler for an empty filter.

[1] Pointed out by: darrenr

Do not accept an empty bpf program.

/* -> /*- for license, minor formatting changes

Remove advertising clause from University of California Regent's
license, per letter dated July 22, 1999 and email from Peter Wemm,
Alan Cox and Robert Watson.

Approved by: core, peter, alc, rwatson

Turn on BPF_ALIGN for all non-i386 platforms, instead of having an
ifdef list that currently lists all the non-i386 platforms that bpf
currently works on.

Remove __P.

sparc64 needs the same alignment fixes that ia64 and alpha need.

Submitted by: tmm

Add ia64 to the list of machines which don't do unaligned reads.

Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL"
is an application space macro and the applications are supposed to be free
to use it as they please (but cannot). This is consistant with the other
BSD's who made this change quite some time ago. More commits to come.

Add 'const' to the bpf_filter() and bpf_validate() prototypes.
Remove a stale comment from bpf_validate().

$Id$ -> $FreeBSD$

Quick fix for breakage of bounds checking in rev.1.12. Only one
of the additional checks in rev.1.12 was wrong. The others are a
bit inconsistent and are probably unnecessarily pessimal. Checking
for overflow of addition, if necessary at all, should be done in
bpf_validate().

PR: 12484

Break long lines that I introduced in a previous commit.

Propagate unsignedness to all variants of 'k', and reorganize the
conditionals to be fully resistent against overflow in unsigned
computations.

Potential problem pointed out by: bde
Reviewed by: bde

Remove guard for < 0 on an unsigned variable.

* Use explicitly sized types for grovelling around inside packets.
* On the alpha, make sure memory accesses are only made to aligned boundaries.

Submitted by: Alex Nash <nash@mcs.net>

Removed unused #includes.

Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not
ready for it yet.

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Completed function declarations and/or added prototypes.

Remove trailing whitespace.

Patch from Greg Ansley:

In rare cases, when the filter specified accesses an multi-byte value that
is split across mbuf's, the value loaded is incorrect. And if you are very
unlucky (like me) it will index off the end of the mbuf and into an
unallocated page and panic the system.

If you look at the code you will discover the the index *k* is added to
the pointer *cp* and the used AGAIN as a subscript.

Added $Id$

The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch.

Reviewed by: Rodney W. Grimes
Submitted by: John Dyson and David Greenman

BSD 4.4 Lite Kernel Sources