ehea: fix skb_frag_size typo
[linux-btrfs-devel.git] / security / selinux / netlink.c
blobce3f481558d8682421ddf410d3adb5f4787df732
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/slab.h>
15 #include <linux/stddef.h>
16 #include <linux/kernel.h>
17 #include <linux/skbuff.h>
18 #include <linux/netlink.h>
19 #include <linux/selinux_netlink.h>
20 #include <net/net_namespace.h>
22 #include "security.h"
24 static struct sock *selnl;
26 static int selnl_msglen(int msgtype)
28 int ret = 0;
30 switch (msgtype) {
31 case SELNL_MSG_SETENFORCE:
32 ret = sizeof(struct selnl_msg_setenforce);
33 break;
35 case SELNL_MSG_POLICYLOAD:
36 ret = sizeof(struct selnl_msg_policyload);
37 break;
39 default:
40 BUG();
42 return ret;
45 static void selnl_add_payload(struct nlmsghdr *nlh, int len, int msgtype, void *data)
47 switch (msgtype) {
48 case SELNL_MSG_SETENFORCE: {
49 struct selnl_msg_setenforce *msg = NLMSG_DATA(nlh);
51 memset(msg, 0, len);
52 msg->val = *((int *)data);
53 break;
56 case SELNL_MSG_POLICYLOAD: {
57 struct selnl_msg_policyload *msg = NLMSG_DATA(nlh);
59 memset(msg, 0, len);
60 msg->seqno = *((u32 *)data);
61 break;
64 default:
65 BUG();
69 static void selnl_notify(int msgtype, void *data)
71 int len;
72 sk_buff_data_t tmp;
73 struct sk_buff *skb;
74 struct nlmsghdr *nlh;
76 len = selnl_msglen(msgtype);
78 skb = alloc_skb(NLMSG_SPACE(len), GFP_USER);
79 if (!skb)
80 goto oom;
82 tmp = skb->tail;
83 nlh = NLMSG_PUT(skb, 0, 0, msgtype, len);
84 selnl_add_payload(nlh, len, msgtype, data);
85 nlh->nlmsg_len = skb->tail - tmp;
86 NETLINK_CB(skb).dst_group = SELNLGRP_AVC;
87 netlink_broadcast(selnl, skb, 0, SELNLGRP_AVC, GFP_USER);
88 out:
89 return;
91 nlmsg_failure:
92 kfree_skb(skb);
93 oom:
94 printk(KERN_ERR "SELinux: OOM in %s\n", __func__);
95 goto out;
98 void selnl_notify_setenforce(int val)
100 selnl_notify(SELNL_MSG_SETENFORCE, &val);
103 void selnl_notify_policyload(u32 seqno)
105 selnl_notify(SELNL_MSG_POLICYLOAD, &seqno);
108 static int __init selnl_init(void)
110 selnl = netlink_kernel_create(&init_net, NETLINK_SELINUX,
111 SELNLGRP_MAX, NULL, NULL, THIS_MODULE);
112 if (selnl == NULL)
113 panic("SELinux: Cannot create netlink socket.");
114 netlink_set_nonroot(NETLINK_SELINUX, NL_NONROOT_RECV);
115 return 0;
118 __initcall(selnl_init);