fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / security / selinux / netlink.c
blobb59871d74dad870e72d13ee48f0dab4b3e95bcde
1 /*
2 * Netlink event notifications for SELinux.
4 * Author: James Morris <jmorris@redhat.com>
6 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
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.
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>
22 static struct sock *selnl;
24 static int selnl_msglen(int msgtype)
26 int ret = 0;
28 switch (msgtype) {
29 case SELNL_MSG_SETENFORCE:
30 ret = sizeof(struct selnl_msg_setenforce);
31 break;
33 case SELNL_MSG_POLICYLOAD:
34 ret = sizeof(struct selnl_msg_policyload);
35 break;
37 default:
38 BUG();
40 return ret;
43 static void selnl_add_payload(struct nlmsghdr *nlh, int len, int msgtype, void *data)
45 switch (msgtype) {
46 case SELNL_MSG_SETENFORCE: {
47 struct selnl_msg_setenforce *msg = NLMSG_DATA(nlh);
49 memset(msg, 0, len);
50 msg->val = *((int *)data);
51 break;
54 case SELNL_MSG_POLICYLOAD: {
55 struct selnl_msg_policyload *msg = NLMSG_DATA(nlh);
57 memset(msg, 0, len);
58 msg->seqno = *((u32 *)data);
59 break;
62 default:
63 BUG();
67 static void selnl_notify(int msgtype, void *data)
69 int len;
70 sk_buff_data_t tmp;
71 struct sk_buff *skb;
72 struct nlmsghdr *nlh;
74 len = selnl_msglen(msgtype);
76 skb = alloc_skb(NLMSG_SPACE(len), GFP_USER);
77 if (!skb)
78 goto oom;
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;
89 nlmsg_failure:
90 kfree_skb(skb);
91 oom:
92 printk(KERN_ERR "SELinux: OOM in %s\n", __FUNCTION__);
93 goto out;
96 void selnl_notify_setenforce(int val)
98 selnl_notify(SELNL_MSG_SETENFORCE, &val);
101 void selnl_notify_policyload(u32 seqno)
103 selnl_notify(SELNL_MSG_POLICYLOAD, &seqno);
106 static int __init selnl_init(void)
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;
116 __initcall(selnl_init);