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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; | |
ac6d439d PM |
83 | NETLINK_CB(skb).dst_group = SELNLGRP_AVC; |
84 | netlink_broadcast(selnl, skb, 0, SELNLGRP_AVC, GFP_USER); | |
1da177e4 LT |
85 | out: |
86 | return; | |
87 | ||
88 | nlmsg_failure: | |
89 | kfree_skb(skb); | |
90 | oom: | |
91 | printk(KERN_ERR "SELinux: OOM in %s\n", __FUNCTION__); | |
92 | goto out; | |
93 | } | |
94 | ||
95 | void selnl_notify_setenforce(int val) | |
96 | { | |
97 | selnl_notify(SELNL_MSG_SETENFORCE, &val); | |
98 | } | |
99 | ||
100 | void selnl_notify_policyload(u32 seqno) | |
101 | { | |
102 | selnl_notify(SELNL_MSG_POLICYLOAD, &seqno); | |
103 | } | |
104 | ||
105 | static int __init selnl_init(void) | |
106 | { | |
06628607 PM |
107 | selnl = netlink_kernel_create(NETLINK_SELINUX, SELNLGRP_MAX, NULL, |
108 | THIS_MODULE); | |
1da177e4 LT |
109 | if (selnl == NULL) |
110 | panic("SELinux: Cannot create netlink socket."); | |
111 | netlink_set_nonroot(NETLINK_SELINUX, NL_NONROOT_RECV); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | __initcall(selnl_init); |