1/*-
2 * Copyright (c) 2007-2009 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * This software was developed by Robert Watson for the TrustedBSD Project.
6 *
7 * This software was developed at the University of Cambridge Computer
8 * Laboratory with support from a grant from Google, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD$");
34
35#include "opt_mac.h"
36
37#include <sys/param.h>
38#include <sys/kernel.h>
39#include <sys/lock.h>
40#include <sys/malloc.h>
41#include <sys/mutex.h>
42#include <sys/sbuf.h>
43#include <sys/systm.h>
44#include <sys/mount.h>
45#include <sys/file.h>
46#include <sys/namei.h>
47#include <sys/protosw.h>
48#include <sys/socket.h>
49#include <sys/socketvar.h>
50#include <sys/sysctl.h>
51
52#include <net/if.h>
53#include <net/if_var.h>
54
55#include <netinet/in.h>
56#include <netinet/ip6.h>
57#include <netinet6/ip6_var.h>
58
59#include <security/mac/mac_framework.h>
60#include <security/mac/mac_internal.h>
61#include <security/mac/mac_policy.h>
62
63static struct label *
64mac_ip6q_label_alloc(int flag)
65{
66	struct label *label;
67	int error;
68
69	label = mac_labelzone_alloc(flag);
70	if (label == NULL)
71		return (NULL);
72
73	if (flag & M_WAITOK)
74		MAC_POLICY_CHECK(ip6q_init_label, label, flag);
75	else
76		MAC_POLICY_CHECK_NOSLEEP(ip6q_init_label, label, flag);
77	if (error) {
78		MAC_POLICY_PERFORM_NOSLEEP(ip6q_destroy_label, label);
79		mac_labelzone_free(label);
80		return (NULL);
81	}
82	return (label);
83}
84
85int
86mac_ip6q_init(struct ip6q *q6, int flag)
87{
88
89	if (mac_labeled & MPC_OBJECT_IP6Q) {
90		q6->ip6q_label = mac_ip6q_label_alloc(flag);
91		if (q6->ip6q_label == NULL)
92			return (ENOMEM);
93	} else
94		q6->ip6q_label = NULL;
95	return (0);
96}
97
98static void
99mac_ip6q_label_free(struct label *label)
100{
101
102	MAC_POLICY_PERFORM_NOSLEEP(ip6q_destroy_label, label);
103	mac_labelzone_free(label);
104}
105
106void
107mac_ip6q_destroy(struct ip6q *q6)
108{
109
110	if (q6->ip6q_label != NULL) {
111		mac_ip6q_label_free(q6->ip6q_label);
112		q6->ip6q_label = NULL;
113	}
114}
115
116void
117mac_ip6q_reassemble(struct ip6q *q6, struct mbuf *m)
118{
119	struct label *label;
120
121	if (mac_policy_count == 0)
122		return;
123
124	label = mac_mbuf_to_label(m);
125
126	MAC_POLICY_PERFORM_NOSLEEP(ip6q_reassemble, q6, q6->ip6q_label, m,
127	    label);
128}
129
130void
131mac_ip6q_create(struct mbuf *m, struct ip6q *q6)
132{
133	struct label *label;
134
135	if (mac_policy_count == 0)
136		return;
137
138	label = mac_mbuf_to_label(m);
139
140	MAC_POLICY_PERFORM_NOSLEEP(ip6q_create, m, label, q6,
141	    q6->ip6q_label);
142}
143
144int
145mac_ip6q_match(struct mbuf *m, struct ip6q *q6)
146{
147	struct label *label;
148	int result;
149
150	if (mac_policy_count == 0)
151		return (1);
152
153	label = mac_mbuf_to_label(m);
154
155	result = 1;
156	MAC_POLICY_BOOLEAN_NOSLEEP(ip6q_match, &&, m, label, q6,
157	    q6->ip6q_label);
158
159	return (result);
160}
161
162void
163mac_ip6q_update(struct mbuf *m, struct ip6q *q6)
164{
165	struct label *label;
166
167	if (mac_policy_count == 0)
168		return;
169
170	label = mac_mbuf_to_label(m);
171
172	MAC_POLICY_PERFORM_NOSLEEP(ip6q_update, m, label, q6,
173	    q6->ip6q_label);
174}
175
176void
177mac_netinet6_nd6_send(struct ifnet *ifp, struct mbuf *m)
178{
179	struct label *mlabel;
180
181	if (mac_policy_count == 0)
182		return;
183
184	mlabel = mac_mbuf_to_label(m);
185
186	MAC_POLICY_PERFORM_NOSLEEP(netinet6_nd6_send, ifp, ifp->if_label, m,
187	    mlabel);
188}
189