[net-next-2.6.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/stddef.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/selinux_netlink.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;
	unsigned char *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_broadcast(selnl, skb, 0, SELNL_GRP_AVC, GFP_USER);
out:
	return;
	
nlmsg_failure:
	kfree_skb(skb);
oom:
	printk(KERN_ERR "SELinux:  OOM in %s\n", __FUNCTION__);
	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(NETLINK_SELINUX, NULL);
	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 <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>
	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>
	20
	21	static struct sock *selnl;
	22
	23	static int selnl_msglen(int msgtype)
	24	{
	25	int ret = 0;
	26
	27	switch (msgtype) {
	28	case SELNL_MSG_SETENFORCE:
	29	ret = sizeof(struct selnl_msg_setenforce);
	30	break;
	31
	32	case SELNL_MSG_POLICYLOAD:
	33	ret = sizeof(struct selnl_msg_policyload);
	34	break;
	35
	36	default:
	37	BUG();
	38	}
	39	return ret;
	40	}
	41
	42	static void selnl_add_payload(struct nlmsghdr nlh, int len, int msgtype, void data)
	43	{
	44	switch (msgtype) {
	45	case SELNL_MSG_SETENFORCE: {
	46	struct selnl_msg_setenforce *msg = NLMSG_DATA(nlh);
	47
	48	memset(msg, 0, len);
	49	msg->val = ((int )data);
	50	break;
	51	}
	52
	53	case SELNL_MSG_POLICYLOAD: {
	54	struct selnl_msg_policyload *msg = NLMSG_DATA(nlh);
	55
	56	memset(msg, 0, len);
	57	msg->seqno = ((u32 )data);
	58	break;
	59	}
	60
	61	default:
	62	BUG();
	63	}
	64	}
65
66	static void selnl_notify(int msgtype, void *data)
67	{
68	int len;
69	unsigned char *tmp;
70	struct sk_buff *skb;
71	struct nlmsghdr *nlh;
72
73	len = selnl_msglen(msgtype);
74
75	skb = alloc_skb(NLMSG_SPACE(len), GFP_USER);
76	if (!skb)
77	goto oom;
78
79	tmp = skb->tail;
80	nlh = NLMSG_PUT(skb, 0, 0, msgtype, len);
81	selnl_add_payload(nlh, len, msgtype, data);
82	nlh->nlmsg_len = skb->tail - tmp;
83	netlink_broadcast(selnl, skb, 0, SELNL_GRP_AVC, GFP_USER);
84	out:
85	return;
86
87	nlmsg_failure:
88	kfree_skb(skb);
89	oom:
90	printk(KERN_ERR "SELinux: OOM in %s\n", __FUNCTION__);
91	goto out;
92	}
93
94	void selnl_notify_setenforce(int val)
95	{
96	selnl_notify(SELNL_MSG_SETENFORCE, &val);
97	}
98
99	void selnl_notify_policyload(u32 seqno)
100	{
101	selnl_notify(SELNL_MSG_POLICYLOAD, &seqno);
102	}
103
104	static int __init selnl_init(void)
105	{
106	selnl = netlink_kernel_create(NETLINK_SELINUX, NULL);
107	if (selnl == NULL)
108	panic("SELinux: Cannot create netlink socket.");
109	netlink_set_nonroot(NETLINK_SELINUX, NL_NONROOT_RECV);
110	return 0;
111	}
112
113	__initcall(selnl_init);