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 #include "opt_mac.h" 34 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/mutex.h> 40 #include <sys/sbuf.h> 41 #include <sys/systm.h> 42 #include <sys/mount.h> 43 #include <sys/file.h> 44 #include <sys/namei.h> 45 #include <sys/protosw.h> 46 #include <sys/socket.h> 47 #include <sys/socketvar.h> 48 #include <sys/sysctl.h> 49 50 #include <net/if.h> 51 #include <net/if_var.h> 52 53 #include <netinet/in.h> 54 #include <netinet/ip6.h> 55 #include <netinet6/ip6_var.h> 56 57 #include <security/mac/mac_framework.h> 58 #include <security/mac/mac_internal.h> 59 #include <security/mac/mac_policy.h> 60 61 static struct label * 62 mac_ip6q_label_alloc(int flag) 63 { 64 struct label *label; 65 int error; 66 67 label = mac_labelzone_alloc(flag); 68 if (label == NULL) 69 return (NULL); 70 71 if (flag & M_WAITOK) 72 MAC_POLICY_CHECK(ip6q_init_label, label, flag); 73 else 74 MAC_POLICY_CHECK_NOSLEEP(ip6q_init_label, label, flag); 75 if (error) { 76 MAC_POLICY_PERFORM_NOSLEEP(ip6q_destroy_label, label); 77 mac_labelzone_free(label); 78 return (NULL); 79 } 80 return (label); 81 } 82 83 int 84 mac_ip6q_init(struct ip6q *q6, int flag) 85 { 86 87 if (mac_labeled & MPC_OBJECT_IP6Q) { 88 q6->ip6q_label = mac_ip6q_label_alloc(flag); 89 if (q6->ip6q_label == NULL) 90 return (ENOMEM); 91 } else 92 q6->ip6q_label = NULL; 93 return (0); 94 } 95 96 static void 97 mac_ip6q_label_free(struct label *label) 98 { 99 100 MAC_POLICY_PERFORM_NOSLEEP(ip6q_destroy_label, label); 101 mac_labelzone_free(label); 102 } 103 104 void 105 mac_ip6q_destroy(struct ip6q *q6) 106 { 107 108 if (q6->ip6q_label != NULL) { 109 mac_ip6q_label_free(q6->ip6q_label); 110 q6->ip6q_label = NULL; 111 } 112 } 113 114 void 115 mac_ip6q_reassemble(struct ip6q *q6, struct mbuf *m) 116 { 117 struct label *label; 118 119 if (mac_policy_count == 0) 120 return; 121 122 label = mac_mbuf_to_label(m); 123 124 MAC_POLICY_PERFORM_NOSLEEP(ip6q_reassemble, q6, q6->ip6q_label, m, 125 label); 126 } 127 128 void 129 mac_ip6q_create(struct mbuf *m, struct ip6q *q6) 130 { 131 struct label *label; 132 133 if (mac_policy_count == 0) 134 return; 135 136 label = mac_mbuf_to_label(m); 137 138 MAC_POLICY_PERFORM_NOSLEEP(ip6q_create, m, label, q6, 139 q6->ip6q_label); 140 } 141 142 int 143 mac_ip6q_match(struct mbuf *m, struct ip6q *q6) 144 { 145 struct label *label; 146 int result; 147 148 if (mac_policy_count == 0) 149 return (1); 150 151 label = mac_mbuf_to_label(m); 152 153 result = 1; 154 MAC_POLICY_BOOLEAN_NOSLEEP(ip6q_match, &&, m, label, q6, 155 q6->ip6q_label); 156 157 return (result); 158 } 159 160 void 161 mac_ip6q_update(struct mbuf *m, struct ip6q *q6) 162 { 163 struct label *label; 164 165 if (mac_policy_count == 0) 166 return; 167 168 label = mac_mbuf_to_label(m); 169 170 MAC_POLICY_PERFORM_NOSLEEP(ip6q_update, m, label, q6, 171 q6->ip6q_label); 172 } 173 174 /* Check with rules in module if the IPv6 address is allowed. */ 175 int 176 mac_inet6_check_add_addr(struct ucred *cred, const struct in6_addr *ia6, 177 struct ifnet *ifp) 178 { 179 int error; 180 181 MAC_POLICY_CHECK(ip6_check_jail, cred, ia6, ifp); 182 return (error); 183 } 184 185 void 186 mac_netinet6_nd6_send(struct ifnet *ifp, struct mbuf *m) 187 { 188 struct label *mlabel; 189 190 if (mac_policy_count == 0) 191 return; 192 193 mlabel = mac_mbuf_to_label(m); 194 195 MAC_POLICY_PERFORM_NOSLEEP(netinet6_nd6_send, ifp, if_getmaclabel(ifp), m, 196 mlabel); 197 } 198