1/*
2 * NetLabel NETLINK Interface
3 *
4 * This file defines the NETLINK interface for the NetLabel system.  The
5 * NetLabel system manages static and dynamic label mappings for network
6 * protocols such as CIPSO and RIPSO.
7 *
8 * Author: Paul Moore <paul@paul-moore.com>
9 *
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
14 *
15 * This program is free software;  you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY;  without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
23 * the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program;  if not, see <http://www.gnu.org/licenses/>.
27 *
28 */
29
30#include <linux/init.h>
31#include <linux/types.h>
32#include <linux/list.h>
33#include <linux/socket.h>
34#include <linux/audit.h>
35#include <linux/tty.h>
36#include <linux/security.h>
37#include <linux/gfp.h>
38#include <net/sock.h>
39#include <net/netlink.h>
40#include <net/genetlink.h>
41#include <net/netlabel.h>
42#include <asm/bug.h>
43
44#include "netlabel_mgmt.h"
45#include "netlabel_unlabeled.h"
46#include "netlabel_cipso_v4.h"
47#include "netlabel_user.h"
48
49/*
50 * NetLabel NETLINK Setup Functions
51 */
52
53/**
54 * netlbl_netlink_init - Initialize the NETLINK communication channel
55 *
56 * Description:
57 * Call out to the NetLabel components so they can register their families and
58 * commands with the Generic NETLINK mechanism.  Returns zero on success and
59 * non-zero on failure.
60 *
61 */
62int __init netlbl_netlink_init(void)
63{
64	int ret_val;
65
66	ret_val = netlbl_mgmt_genl_init();
67	if (ret_val != 0)
68		return ret_val;
69
70	ret_val = netlbl_cipsov4_genl_init();
71	if (ret_val != 0)
72		return ret_val;
73
74	return netlbl_unlabel_genl_init();
75}
76
77/*
78 * NetLabel Audit Functions
79 */
80
81/**
82 * netlbl_audit_start_common - Start an audit message
83 * @type: audit message type
84 * @audit_info: NetLabel audit information
85 *
86 * Description:
87 * Start an audit message using the type specified in @type and fill the audit
88 * message with some fields common to all NetLabel audit messages.  Returns
89 * a pointer to the audit buffer on success, NULL on failure.
90 *
91 */
92struct audit_buffer *netlbl_audit_start_common(int type,
93					       struct netlbl_audit *audit_info)
94{
95	struct audit_buffer *audit_buf;
96	char *secctx;
97	u32 secctx_len;
98
99	if (audit_enabled == 0)
100		return NULL;
101
102	audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type);
103	if (audit_buf == NULL)
104		return NULL;
105
106	audit_log_format(audit_buf, "netlabel: auid=%u ses=%u",
107			 from_kuid(&init_user_ns, audit_info->loginuid),
108			 audit_info->sessionid);
109
110	if (audit_info->secid != 0 &&
111	    security_secid_to_secctx(audit_info->secid,
112				     &secctx,
113				     &secctx_len) == 0) {
114		audit_log_format(audit_buf, " subj=%s", secctx);
115		security_release_secctx(secctx, secctx_len);
116	}
117
118	return audit_buf;
119}
120