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.moore@hp.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, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 *
29 */
30
31#include <linux/init.h>
32#include <linux/types.h>
33#include <linux/list.h>
34#include <linux/socket.h>
35#include <linux/audit.h>
36#include <linux/tty.h>
37#include <linux/security.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/* do not do any auditing if audit_enabled == 0, see kernel/audit.c for
50 * details */
51extern int audit_enabled;
52
53/*
54 * NetLabel NETLINK Setup Functions
55 */
56
57/**
58 * netlbl_netlink_init - Initialize the NETLINK communication channel
59 *
60 * Description:
61 * Call out to the NetLabel components so they can register their families and
62 * commands with the Generic NETLINK mechanism.  Returns zero on success and
63 * non-zero on failure.
64 *
65 */
66int netlbl_netlink_init(void)
67{
68	int ret_val;
69
70	ret_val = netlbl_mgmt_genl_init();
71	if (ret_val != 0)
72		return ret_val;
73
74	ret_val = netlbl_cipsov4_genl_init();
75	if (ret_val != 0)
76		return ret_val;
77
78	ret_val = netlbl_unlabel_genl_init();
79	if (ret_val != 0)
80		return ret_val;
81
82	return 0;
83}
84
85/*
86 * NetLabel Audit Functions
87 */
88
89/**
90 * netlbl_audit_start_common - Start an audit message
91 * @type: audit message type
92 * @audit_info: NetLabel audit information
93 *
94 * Description:
95 * Start an audit message using the type specified in @type and fill the audit
96 * message with some fields common to all NetLabel audit messages.  Returns
97 * a pointer to the audit buffer on success, NULL on failure.
98 *
99 */
100struct audit_buffer *netlbl_audit_start_common(int type,
101					       struct netlbl_audit *audit_info)
102{
103	struct audit_context *audit_ctx = current->audit_context;
104	struct audit_buffer *audit_buf;
105	char *secctx;
106	u32 secctx_len;
107
108	if (audit_enabled == 0)
109		return NULL;
110
111	audit_buf = audit_log_start(audit_ctx, GFP_ATOMIC, type);
112	if (audit_buf == NULL)
113		return NULL;
114
115	audit_log_format(audit_buf, "netlabel: auid=%u", audit_info->loginuid);
116
117	if (audit_info->secid != 0 &&
118	    security_secid_to_secctx(audit_info->secid,
119				     &secctx,
120				     &secctx_len) == 0)
121		audit_log_format(audit_buf, " subj=%s", secctx);
122
123	return audit_buf;
124}
125