/*
 * Netlink event notifications for SELinux.
 *
 * Author: James Morris <jmorris@redhat.com>
 *
 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2,
 * as published by the Free Software Foundation.
 */
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/skbuff.h>
#include <linux/selinux_netlink.h>
#include <net/net_namespace.h>
#include <net/netlink.h>

#include "security.h"

static struct sock *selnl;

static int selnl_msglen(int msgtype)
{
	int ret = 0;

	switch (msgtype) {
	case SELNL_MSG_SETENFORCE:
		ret = sizeof(struct selnl_msg_setenforce);
		break;

	case SELNL_MSG_POLICYLOAD:
		ret = sizeof(struct selnl_msg_policyload);
		break;

	default:
		BUG();
	}
	return ret;
}

static void selnl_add_payload(struct nlmsghdr *nlh, int len, int msgtype, void *data)
{
	switch (msgtype) {
	case SELNL_MSG_SETENFORCE: {
		struct selnl_msg_setenforce *msg = nlmsg_data(nlh);

		memset(msg, 0, len);
		msg->val = *((int *)data);
		break;
	}

	case SELNL_MSG_POLICYLOAD: {
		struct selnl_msg_policyload *msg = nlmsg_data(nlh);

		memset(msg, 0, len);
		msg->seqno = *((u32 *)data);
		break;
	}

	default:
		BUG();
	}
}

static void selnl_notify(int msgtype, void *data)
{
	int len;
	sk_buff_data_t tmp;
	struct sk_buff *skb;
	struct nlmsghdr *nlh;

	len = selnl_msglen(msgtype);

	skb = nlmsg_new(len, GFP_USER);
	if (!skb)
		goto oom;

	tmp = skb->tail;
	nlh = nlmsg_put(skb, 0, 0, msgtype, len, 0);
	if (!nlh)
		goto out_kfree_skb;
	selnl_add_payload(nlh, len, msgtype, data);
	nlh->nlmsg_len = skb->tail - tmp;
	NETLINK_CB(skb).dst_group = SELNLGRP_AVC;
	netlink_broadcast(selnl, skb, 0, SELNLGRP_AVC, GFP_USER);
out:
	return;

out_kfree_skb:
	kfree_skb(skb);
oom:
	printk(KERN_ERR "SELinux:  OOM in %s\n", __func__);
	goto out;
}

void selnl_notify_setenforce(int val)
{
	selnl_notify(SELNL_MSG_SETENFORCE, &val);
}

void selnl_notify_policyload(u32 seqno)
{
	selnl_notify(SELNL_MSG_POLICYLOAD, &seqno);
}

static int __init selnl_init(void)
{
	struct netlink_kernel_cfg cfg = {
		.groups	= SELNLGRP_MAX,
		.flags	= NL_CFG_F_NONROOT_RECV,
	};

	selnl = netlink_kernel_create(&init_net, NETLINK_SELINUX, &cfg);
	if (selnl == NULL)
		panic("SELinux:  Cannot create netlink socket.");
	return 0;
}

__initcall(selnl_init);

<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=964fd4801d40ead69a447482c0dd0cd4be495e47'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/fs?h=nds-private-remove&amp;id=964fd4801d40ead69a447482c0dd0cd4be495e47'>fs</a>/<a href='/cgit.cgi/linux/net-next.git/log/fs/affs?h=nds-private-remove&amp;id=964fd4801d40ead69a447482c0dd0cd4be495e47'>affs</a>/<a href='/cgit.cgi/linux/net-next.git/log/fs/affs/symlink.c?h=nds-private-remove&amp;id=964fd4801d40ead69a447482c0dd0cd4be495e47'>symlink.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/fs/affs/symlink.c?h=nds-private-remove&amp;id=964fd4801d40ead69a447482c0dd0cd4be495e47&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
d><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/'>f63906f41699c8e38af9d12b063e2ceab0286ef2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound'>sound</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound?id=e34bac726d27056081d0250c0e173e4b155aa340'>e34bac726d27056081d0250c0e173e4b155aa340</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound?id2=e34bac726d27056081d0250c0e173e4b155aa340'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound?id=868c97a846a73e937d835b09b8c885a69df50ec8'>868c97a846a73e937d835b09b8c885a69df50ec8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound?id2=868c97a846a73e937d835b09b8c885a69df50ec8'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'docs-4.10' of git://git.lwn.net/linux<span class='decoration'><a class='deco' href='/cgit.cgi/linux/net-next.git/commit/sound?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>HEAD</a><a class='branch-deco' href='/cgit.cgi/linux/net-next.git/log/sound'>master</a></span></div><div class='commit-msg'>Pull documentation update from Jonathan Corbet:
 "These are the documentation changes for 4.10.

  It's another busy cycle for the docs tree, as the sphinx conversion
  continues. Highlights include:

   - Further work on PDF output, which remains a bit of a pain but
     should be more solid now.

   - Five more DocBook template files converted to Sphinx. Only 27 to
     go... Lots of plain-text files have also been converted and
     integrated.

   - Images in binary formats have been replaced with more
     source-friendly versions.

   - Various bits of organizational work, including the renaming of
     various files discussed at the kernel summit.

   - New documentation for the device_link mechanism.

  ... and, of course, lots of typo fixes and small updates"

* tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits)
  dma-buf: Extract dma-buf.rst
  Update Documentation/00-INDEX
  docs: 00-INDEX: document directories/files with no docs
  docs: 00-INDEX: remove non-existing entries
  docs: 00-INDEX: add missing entries for documentation files/dirs
  docs: 00-INDEX: consolidate process/ and admin-guide/ description
  scripts: add a script to check if Documentation/00-INDEX is sane
  Docs: change sh -&gt; awk in REPORTING-BUGS
  Documentation/core-api/device_link: Add initial documentation
  core-api: remove an unexpected unident
  ppc/idle: Add documentation for powersave=off
  Doc: Correct typo, "Introdution" =&gt; "Introduction"
  Documentation/atomic_ops.txt: convert to ReST markup
  Documentation/local_ops.txt: convert to ReST markup
  Documentation/assoc_array.txt: convert to ReST markup
  docs-rst: parse-headers.pl: cleanup the documentation
  docs-rst: fix media cleandocs target
  docs-rst: media/Makefile: reorganize the rules
  docs-rst: media: build SVG from graphviz files
  docs-rst: replace bayer.png by a SVG image
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/'>Diffstat</a> (limited to 'sound')</div><table summary='diffstat' class='diffstat'>