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);
114
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