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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NetLabel NETLINK Interface
4 *
5 * This file defines the NETLINK interface for the NetLabel system. The
6 * NetLabel system manages static and dynamic label mappings for network
7 * protocols such as CIPSO and RIPSO.
8 *
9 * Author: Paul Moore <paul@paul-moore.com>
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
14 */
15
16#include <linux/init.h>
17#include <linux/types.h>
18#include <linux/list.h>
19#include <linux/socket.h>
20#include <linux/audit.h>
21#include <linux/tty.h>
22#include <linux/security.h>
23#include <linux/gfp.h>
24#include <net/sock.h>
25#include <net/netlink.h>
26#include <net/genetlink.h>
27#include <net/netlabel.h>
28#include <asm/bug.h>
29
30#include "netlabel_mgmt.h"
31#include "netlabel_unlabeled.h"
32#include "netlabel_cipso_v4.h"
33#include "netlabel_calipso.h"
34#include "netlabel_user.h"
35
36/*
37 * NetLabel NETLINK Setup Functions
38 */
39
40/**
41 * netlbl_netlink_init - Initialize the NETLINK communication channel
42 *
43 * Description:
44 * Call out to the NetLabel components so they can register their families and
45 * commands with the Generic NETLINK mechanism. Returns zero on success and
46 * non-zero on failure.
47 *
48 */
49int __init netlbl_netlink_init(void)
50{
51 int ret_val;
52
53 ret_val = netlbl_mgmt_genl_init();
54 if (ret_val != 0)
55 return ret_val;
56
57 ret_val = netlbl_cipsov4_genl_init();
58 if (ret_val != 0)
59 return ret_val;
60
61 ret_val = netlbl_calipso_genl_init();
62 if (ret_val != 0)
63 return ret_val;
64
65 return netlbl_unlabel_genl_init();
66}
67
68/*
69 * NetLabel Audit Functions
70 */
71
72/**
73 * netlbl_audit_start_common - Start an audit message
74 * @type: audit message type
75 * @audit_info: NetLabel audit information
76 *
77 * Description:
78 * Start an audit message using the type specified in @type and fill the audit
79 * message with some fields common to all NetLabel audit messages. Returns
80 * a pointer to the audit buffer on success, NULL on failure.
81 *
82 */
83struct audit_buffer *netlbl_audit_start_common(int type,
84 struct netlbl_audit *audit_info)
85{
86 struct audit_buffer *audit_buf;
87
88 if (audit_enabled == AUDIT_OFF)
89 return NULL;
90
91 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, type);
92 if (audit_buf == NULL)
93 return NULL;
94
95 audit_log_format(audit_buf, "netlabel: auid=%u ses=%u",
96 from_kuid(&init_user_ns, audit_info->loginuid),
97 audit_info->sessionid);
98 audit_log_subj_ctx(audit_buf, &audit_info->prop);
99
100 return audit_buf;
101}