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 #include <net/net_namespace.h>
21
22 static struct sock *selnl;
23
24 static int selnl_msglen(int msgtype)
25 {
26 int ret = 0;
27
28 switch (msgtype) {
29 case SELNL_MSG_SETENFORCE:
30 ret = sizeof(struct selnl_msg_setenforce);
31 break;
32
33 case SELNL_MSG_POLICYLOAD:
34 ret = sizeof(struct selnl_msg_policyload);
35 break;
36
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);
48
49 memset(msg, 0, len);
50 msg->val = *((int *)data);
51 break;
52 }
53
54 case SELNL_MSG_POLICYLOAD: {
55 struct selnl_msg_policyload *msg = NLMSG_DATA(nlh);
56
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;
70 sk_buff_data_t tmp;
71 struct sk_buff *skb;
72 struct nlmsghdr *nlh;
73
74 len = selnl_msglen(msgtype);
75
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;
84 NETLINK_CB(skb).dst_group = SELNLGRP_AVC;
85 netlink_broadcast(selnl, skb, 0, SELNLGRP_AVC, GFP_USER);
86 out:
87 return;
88
89 nlmsg_failure:
90 kfree_skb(skb);
91 oom:
92 printk(KERN_ERR "SELinux: OOM in %s\n", __FUNCTION__);
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 {
108 selnl = netlink_kernel_create(&init_net, NETLINK_SELINUX,
109 SELNLGRP_MAX, NULL, NULL, THIS_MODULE);
110 if (selnl == NULL)
111 panic("SELinux: Cannot create netlink socket.");
112 netlink_set_nonroot(NETLINK_SELINUX, NL_NONROOT_RECV);
113 return 0;
114 }
115
116 __initcall(selnl_init);
117
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