Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Update packet filter (pf) code to OpenBSD 4.5.

You need to update userland (world and ports) tools
to be in sync with the kernel.

Submitted by: mlaier
Submitted by: eri

Adapt OpenBSD pf's "sloopy" TCP state machine which is useful for Direct
Server Return mode, where not all packets would be visible to the load
balancer or gateway.

This commit should be reverted when we merge future pf versions. The
benefit it would provide is that this version does not break any existing
public interface and thus won't be a problem if we want to MFC it to
earlier FreeBSD releases.

Discussed with: mlaier
Obtained from: OpenBSD
Sponsored by: iXsystems, Inc.
MFC after: 1 month

Commit resolved import of OpenBSD 4.1 pf userland from perforce.

Approved by: re (kensmith)

Resolve conflicts created during the import of pf 3.7 Some features are
missing and will be implemented in a second step. This is functional as is.

Tested by: freebsd-pf, pfsense.org
Obtained from: OpenBSD

Commit userland part of pf version 3.5 from OpenBSD (OPENBSD_3_5_BASE).

This commit was generated by cvs2svn to compensate for changes in r130614,
which included commits to RCS files with non-trunk default branches.

Import userland of pf 3.5 from OpenBSD (OPENBSD_3_5_BASE).

Vendor import of OpenBSD's pf userland as of OpenBSD 3.4

Approved by: bms(mentor), core(in general)