blob: 18d08acafa7827485161bee36f7a4ea16ca9587d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
21static struct sock *selnl;
22
23static 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
42static 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
66static 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);
84out:
85 return;
86
87nlmsg_failure:
88 kfree_skb(skb);
89oom:
90 printk(KERN_ERR "SELinux: OOM in %s\n", __FUNCTION__);
91 goto out;
92}
93
94void selnl_notify_setenforce(int val)
95{
96 selnl_notify(SELNL_MSG_SETENFORCE, &val);
97}
98
99void selnl_notify_policyload(u32 seqno)
100{
101 selnl_notify(SELNL_MSG_POLICYLOAD, &seqno);
102}
103
104static 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);