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 63 static struct label * 64 mac_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 85 int 86 mac_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 98 static void 99 mac_ip6q_label_free(struct label *label) 100 { 101 102 MAC_POLICY_PERFORM_NOSLEEP(ip6q_destroy_label, label); 103 mac_labelzone_free(label); 104 } 105 106 void 107 mac_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 } 115 116 void 117 mac_ip6q_reassemble(struct ip6q *q6, struct mbuf *m) 118 { 119 struct label *label; 120 121 label = mac_mbuf_to_label(m); 122 123 MAC_POLICY_PERFORM_NOSLEEP(ip6q_reassemble, q6, q6->ip6q_label, m, 124 label); 125 } 126 127 void 128 mac_ip6q_create(struct mbuf *m, struct ip6q *q6) 129 { 130 struct label *label; 131 132 label = mac_mbuf_to_label(m); 133 134 MAC_POLICY_PERFORM_NOSLEEP(ip6q_create, m, label, q6, 135 q6->ip6q_label); 136 } 137 138 int 139 mac_ip6q_match(struct mbuf *m, struct ip6q *q6) 140 { 141 struct label *label; 142 int result; 143 144 label = mac_mbuf_to_label(m); 145 146 result = 1; 147 MAC_POLICY_BOOLEAN_NOSLEEP(ip6q_match, &&, m, label, q6, 148 q6->ip6q_label); 149 150 return (result); 151 } 152 153 void 154 mac_ip6q_update(struct mbuf *m, struct ip6q *q6) 155 { 156 struct label *label; 157 158 label = mac_mbuf_to_label(m); 159 160 MAC_POLICY_PERFORM_NOSLEEP(ip6q_update, m, label, q6, 161 q6->ip6q_label); 162 } 163 164 void 165 mac_netinet6_nd6_send(struct ifnet *ifp, struct mbuf *m) 166 { 167 struct label *mlabel; 168 169 mlabel = mac_mbuf_to_label(m); 170 171 MAC_POLICY_PERFORM_NOSLEEP(netinet6_nd6_send, ifp, ifp->if_label, m, 172 mlabel); 173 } 174