[mirror_ubuntu-artful-kernel.git] / security / selinux / netlink.c

/*
 * 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/netlink.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 = alloc_skb(NLMSG_SPACE(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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Netlink event notifications for SELinux.
	3	*
	4	* Author: James Morris <jmorris@redhat.com>
	5	*
	6	* Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2,
	10	* as published by the Free Software Foundation.
	11	*/
	12	#include <linux/init.h>
	13	#include <linux/types.h>
5a0e3ad6	14	#include <linux/slab.h>
1da177e4 LT	15	#include <linux/stddef.h>
1da177e4 LT	16	#include <linux/kernel.h>
44fc7ea0	17	#include <linux/export.h>
1da177e4 LT	18	#include <linux/skbuff.h>
	19	#include <linux/netlink.h>
	20	#include <linux/selinux_netlink.h>
b4b51029	21	#include <net/net_namespace.h>
01f534d0	22	#include <net/netlink.h>
1da177e4	23
6a3fbe81 JM	24	#include "security.h"
6a3fbe81 JM	25
1da177e4 LT	26	static struct sock *selnl;
	27
	28	static int selnl_msglen(int msgtype)
	29	{
	30	int ret = 0;
c544c028	31
1da177e4 LT	32	switch (msgtype) {
	33	case SELNL_MSG_SETENFORCE:
	34	ret = sizeof(struct selnl_msg_setenforce);
	35	break;
c544c028	36
1da177e4 LT	37	case SELNL_MSG_POLICYLOAD:
	38	ret = sizeof(struct selnl_msg_policyload);
	39	break;
c544c028	40
1da177e4 LT	41	default:
	42	BUG();
	43	}
	44	return ret;
	45	}
	46
	47	static void selnl_add_payload(struct nlmsghdr nlh, int len, int msgtype, void data)
	48	{
	49	switch (msgtype) {
	50	case SELNL_MSG_SETENFORCE: {
01f534d0	51	struct selnl_msg_setenforce *msg = nlmsg_data(nlh);
c544c028	52
1da177e4 LT	53	memset(msg, 0, len);
	54	msg->val = ((int )data);
	55	break;
	56	}
c544c028	57
1da177e4	58	case SELNL_MSG_POLICYLOAD: {
01f534d0	59	struct selnl_msg_policyload *msg = nlmsg_data(nlh);
c544c028	60
1da177e4 LT	61	memset(msg, 0, len);
	62	msg->seqno = ((u32 )data);
	63	break;
	64	}
	65
	66	default:
	67	BUG();
	68	}
	69	}
	70
	71	static void selnl_notify(int msgtype, void *data)
	72	{
	73	int len;
27a884dc	74	sk_buff_data_t tmp;
1da177e4 LT	75	struct sk_buff *skb;
1da177e4 LT	76	struct nlmsghdr *nlh;
c544c028	77
1da177e4	78	len = selnl_msglen(msgtype);
c544c028	79
1da177e4 LT	80	skb = alloc_skb(NLMSG_SPACE(len), GFP_USER);
	81	if (!skb)
	82	goto oom;
	83
	84	tmp = skb->tail;
01f534d0 DM	85	nlh = nlmsg_put(skb, 0, 0, msgtype, len, 0);
	86	if (!nlh)
	87	goto out_kfree_skb;
1da177e4 LT	88	selnl_add_payload(nlh, len, msgtype, data);
1da177e4 LT	89	nlh->nlmsg_len = skb->tail - tmp;
ac6d439d PM	90	NETLINK_CB(skb).dst_group = SELNLGRP_AVC;
ac6d439d PM	91	netlink_broadcast(selnl, skb, 0, SELNLGRP_AVC, GFP_USER);
1da177e4 LT	92	out:
1da177e4 LT	93	return;
c544c028	94
01f534d0	95	out_kfree_skb:
1da177e4 LT	96	kfree_skb(skb);
1da177e4 LT	97	oom:
dd6f953a	98	printk(KERN_ERR "SELinux: OOM in %s\n", __func__);
1da177e4 LT	99	goto out;
	100	}
	101
	102	void selnl_notify_setenforce(int val)
	103	{
	104	selnl_notify(SELNL_MSG_SETENFORCE, &val);
	105	}
	106
	107	void selnl_notify_policyload(u32 seqno)
	108	{
	109	selnl_notify(SELNL_MSG_POLICYLOAD, &seqno);
	110	}
	111
	112	static int __init selnl_init(void)
	113	{
a31f2d17 PNA	114	struct netlink_kernel_cfg cfg = {
a31f2d17 PNA	115	.groups = SELNLGRP_MAX,
9785e10a	116	.flags = NL_CFG_F_NONROOT_RECV,
a31f2d17 PNA	117	};
a31f2d17 PNA	118
9f00d977	119	selnl = netlink_kernel_create(&init_net, NETLINK_SELINUX, &cfg);
1da177e4 LT	120	if (selnl == NULL)
1da177e4 LT	121	panic("SELinux: Cannot create netlink socket.");
1da177e4 LT	122	return 0;
	123	}
	124
	125	__initcall(selnl_init);