[linux.git] / security / selinux / netlink.c

/*
 * Netlink event notifications for SELinux.
 *
 * Author: James Morris <[email protected]>
 *
 * Copyright (C) 2004 Red Hat, Inc., James Morris <[email protected]>
 *
 * 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/stddef.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/selinux_netlink.h>
#include <net/net_namespace.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);
	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;

nlmsg_failure:
	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)
{
	selnl = netlink_kernel_create(&init_net, NETLINK_SELINUX,
				      SELNLGRP_MAX, NULL, NULL, THIS_MODULE);
	if (selnl == NULL)
		panic("SELinux:  Cannot create netlink socket.");
	netlink_set_nonroot(NETLINK_SELINUX, NL_NONROOT_RECV);
	return 0;
}

__initcall(selnl_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Netlink event notifications for SELinux.
	3	*
	4	* Author: James Morris <[email protected]>
	5	*
	6	* Copyright (C) 2004 Red Hat, Inc., James Morris <[email protected]>
	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>
	14	#include <linux/stddef.h>
	15	#include <linux/kernel.h>
	16	#include <linux/list.h>
	17	#include <linux/skbuff.h>
	18	#include <linux/netlink.h>
	19	#include <linux/selinux_netlink.h>
b4b51029	20	#include <net/net_namespace.h>
1da177e4 LT	21
	22	static struct sock *selnl;
	23
	24	static int selnl_msglen(int msgtype)
	25	{
	26	int ret = 0;
c544c028	27
1da177e4 LT	28	switch (msgtype) {
	29	case SELNL_MSG_SETENFORCE:
	30	ret = sizeof(struct selnl_msg_setenforce);
	31	break;
c544c028	32
1da177e4 LT	33	case SELNL_MSG_POLICYLOAD:
	34	ret = sizeof(struct selnl_msg_policyload);
	35	break;
c544c028	36
1da177e4 LT	37	default:
	38	BUG();
	39	}
	40	return ret;
	41	}
	42
	43	static void selnl_add_payload(struct nlmsghdr nlh, int len, int msgtype, void data)
	44	{
	45	switch (msgtype) {
	46	case SELNL_MSG_SETENFORCE: {
	47	struct selnl_msg_setenforce *msg = NLMSG_DATA(nlh);
c544c028	48
1da177e4 LT	49	memset(msg, 0, len);
	50	msg->val = ((int )data);
	51	break;
	52	}
c544c028	53
1da177e4 LT	54	case SELNL_MSG_POLICYLOAD: {
1da177e4 LT	55	struct selnl_msg_policyload *msg = NLMSG_DATA(nlh);
c544c028	56
1da177e4 LT	57	memset(msg, 0, len);
	58	msg->seqno = ((u32 )data);
	59	break;
	60	}
	61
	62	default:
	63	BUG();
	64	}
	65	}
	66
	67	static void selnl_notify(int msgtype, void *data)
	68	{
	69	int len;
27a884dc	70	sk_buff_data_t tmp;
1da177e4 LT	71	struct sk_buff *skb;
1da177e4 LT	72	struct nlmsghdr *nlh;
c544c028	73
1da177e4	74	len = selnl_msglen(msgtype);
c544c028	75
1da177e4 LT	76	skb = alloc_skb(NLMSG_SPACE(len), GFP_USER);
	77	if (!skb)
	78	goto oom;
	79
	80	tmp = skb->tail;
	81	nlh = NLMSG_PUT(skb, 0, 0, msgtype, len);
	82	selnl_add_payload(nlh, len, msgtype, data);
	83	nlh->nlmsg_len = skb->tail - tmp;
ac6d439d PM	84	NETLINK_CB(skb).dst_group = SELNLGRP_AVC;
ac6d439d PM	85	netlink_broadcast(selnl, skb, 0, SELNLGRP_AVC, GFP_USER);
1da177e4 LT	86	out:
1da177e4 LT	87	return;
c544c028	88
1da177e4 LT	89	nlmsg_failure:
	90	kfree_skb(skb);
	91	oom:
dd6f953a	92	printk(KERN_ERR "SELinux: OOM in %s\n", __func__);
1da177e4 LT	93	goto out;
	94	}
	95
	96	void selnl_notify_setenforce(int val)
	97	{
	98	selnl_notify(SELNL_MSG_SETENFORCE, &val);
	99	}
	100
	101	void selnl_notify_policyload(u32 seqno)
	102	{
	103	selnl_notify(SELNL_MSG_POLICYLOAD, &seqno);
	104	}
	105
	106	static int __init selnl_init(void)
	107	{
b4b51029 EB	108	selnl = netlink_kernel_create(&init_net, NETLINK_SELINUX,
b4b51029 EB	109	SELNLGRP_MAX, NULL, NULL, THIS_MODULE);
1da177e4 LT	110	if (selnl == NULL)
1da177e4 LT	111	panic("SELinux: Cannot create netlink socket.");
c544c028	112	netlink_set_nonroot(NETLINK_SELINUX, NL_NONROOT_RECV);
1da177e4 LT	113	return 0;
	114	}
	115
	116	__initcall(selnl_init);