selinux: make header files self-including

Include all necessary headers in header files to enable third party
applications, like LSP servers, to resolve all used symbols.

ibpkey.h: include "flask.h" for SECINITSID_UNLABELED
initial_sid_to_string.h: include <linux/stddef.h> for NULL

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

selinux: include necessary headers in headers

Include header files required for struct or typedef declarations in
header files. This is for example helpful when working with an IDE, which
needs to resolve those symbols.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

selinux: move ibpkeys code under CONFIG_SECURITY_INFINIBAND.

Move cache based pkey sid retrieval code which was added
with commit "409dcf31" under CONFIG_SECURITY_INFINIBAND.
As its going to alloc a new cache which impacts
low RAM devices which was enabled by default.

Suggested-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Ravi Kumar Siddojigari <rsiddoji@codeaurora.org>
[PM: checkpatch.pl cleanups, fixed capitalization in the description]
Signed-off-by: Paul Moore <paul@paul-moore.com>

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of version 2 of the gnu general public license as
published by the free software foundation this program is
distributed in the hope that it will be useful but without any
warranty without even the implied warranty of merchantability or
fitness for a particular purpose see the gnu general public license
for more details

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-only

has been chosen to replace the boilerplate/reference in 64 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141901.894819585@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

selinux: Add a cache for quicker retreival of PKey SIDs

It is likely that the SID for the same PKey will be requested many
times. To reduce the time to modify QPs and process MADs use a cache to
store PKey SIDs.

This code is heavily based on the "netif" and "netport" concept
originally developed by James Morris <jmorris@redhat.com> and Paul Moore
<paul@paul-moore.com> (see security/selinux/netif.c and
security/selinux/netport.c for more information)

Signed-off-by: Daniel Jurgens <danielj@mellanox.com>
Acked-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>