[GitHub/mt8127/android_kernel_alcatel_ttab.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/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);
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	18	#include <linux/skbuff.h>
1da177e4	19	#include <linux/selinux_netlink.h>
b4b51029	20	#include <net/net_namespace.h>
01f534d0	21	#include <net/netlink.h>
1da177e4	22
6a3fbe81 JM	23	#include "security.h"
6a3fbe81 JM	24
1da177e4 LT	25	static struct sock *selnl;
	26
	27	static int selnl_msglen(int msgtype)
	28	{
	29	int ret = 0;
c544c028	30
1da177e4 LT	31	switch (msgtype) {
	32	case SELNL_MSG_SETENFORCE:
	33	ret = sizeof(struct selnl_msg_setenforce);
	34	break;
c544c028	35
1da177e4 LT	36	case SELNL_MSG_POLICYLOAD:
	37	ret = sizeof(struct selnl_msg_policyload);
	38	break;
c544c028	39
1da177e4 LT	40	default:
	41	BUG();
	42	}
	43	return ret;
	44	}
	45
	46	static void selnl_add_payload(struct nlmsghdr nlh, int len, int msgtype, void data)
	47	{
	48	switch (msgtype) {
	49	case SELNL_MSG_SETENFORCE: {
01f534d0	50	struct selnl_msg_setenforce *msg = nlmsg_data(nlh);
c544c028	51
1da177e4 LT	52	memset(msg, 0, len);
	53	msg->val = ((int )data);
	54	break;
	55	}
c544c028	56
1da177e4	57	case SELNL_MSG_POLICYLOAD: {
01f534d0	58	struct selnl_msg_policyload *msg = nlmsg_data(nlh);
c544c028	59
1da177e4 LT	60	memset(msg, 0, len);
	61	msg->seqno = ((u32 )data);
	62	break;
	63	}
	64
	65	default:
	66	BUG();
	67	}
	68	}
	69
	70	static void selnl_notify(int msgtype, void *data)
	71	{
	72	int len;
27a884dc	73	sk_buff_data_t tmp;
1da177e4 LT	74	struct sk_buff *skb;
1da177e4 LT	75	struct nlmsghdr *nlh;
c544c028	76
1da177e4	77	len = selnl_msglen(msgtype);
c544c028	78
77954983	79	skb = nlmsg_new(len, GFP_USER);
1da177e4 LT	80	if (!skb)
	81	goto oom;
	82
	83	tmp = skb->tail;
01f534d0 DM	84	nlh = nlmsg_put(skb, 0, 0, msgtype, len, 0);
	85	if (!nlh)
	86	goto out_kfree_skb;
1da177e4 LT	87	selnl_add_payload(nlh, len, msgtype, data);
1da177e4 LT	88	nlh->nlmsg_len = skb->tail - tmp;
ac6d439d PM	89	NETLINK_CB(skb).dst_group = SELNLGRP_AVC;
ac6d439d PM	90	netlink_broadcast(selnl, skb, 0, SELNLGRP_AVC, GFP_USER);
1da177e4 LT	91	out:
1da177e4 LT	92	return;
c544c028	93
01f534d0	94	out_kfree_skb:
1da177e4 LT	95	kfree_skb(skb);
1da177e4 LT	96	oom:
dd6f953a	97	printk(KERN_ERR "SELinux: OOM in %s\n", __func__);
1da177e4 LT	98	goto out;
	99	}
	100
	101	void selnl_notify_setenforce(int val)
	102	{
	103	selnl_notify(SELNL_MSG_SETENFORCE, &val);
	104	}
	105
	106	void selnl_notify_policyload(u32 seqno)
	107	{
	108	selnl_notify(SELNL_MSG_POLICYLOAD, &seqno);
	109	}
	110
	111	static int __init selnl_init(void)
	112	{
a31f2d17 PNA	113	struct netlink_kernel_cfg cfg = {
a31f2d17 PNA	114	.groups = SELNLGRP_MAX,
9785e10a	115	.flags = NL_CFG_F_NONROOT_RECV,
a31f2d17 PNA	116	};
a31f2d17 PNA	117
9f00d977	118	selnl = netlink_kernel_create(&init_net, NETLINK_SELINUX, &cfg);
1da177e4 LT	119	if (selnl == NULL)
1da177e4 LT	120	panic("SELinux: Cannot create netlink socket.");
1da177e4 LT	121	return 0;
	122	}
	123
	124	__initcall(selnl_init);