ieee80211_acl.c revision 1.9.54.2
1 /* $NetBSD: ieee80211_acl.c,v 1.9.54.2 2018/07/12 16:35:34 phil Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 5 * 6 * Copyright (c) 2004-2008 Sam Leffler, Errno Consulting 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 #ifdef __FreeBSD__ 32 __FBSDID("$FreeBSD$"); 33 #endif 34 35 /* 36 * IEEE 802.11 MAC ACL support. 37 * 38 * When this module is loaded the sender address of each auth mgt 39 * frame is passed to the iac_check method and the module indicates 40 * if the frame should be accepted or rejected. If the policy is 41 * set to ACL_POLICY_OPEN then all frames are accepted w/o checking 42 * the address. Otherwise, the address is looked up in the database 43 * and if found the frame is either accepted (ACL_POLICY_ALLOW) 44 * or rejected (ACL_POLICY_DENT). 45 */ 46 #include "opt_wlan.h" 47 48 #include <sys/param.h> 49 #include <sys/kernel.h> 50 #include <sys/systm.h> 51 #include <sys/malloc.h> 52 #include <sys/mbuf.h> 53 #include <sys/module.h> 54 #include <sys/queue.h> 55 56 #include <sys/socket.h> 57 58 #include <net/if.h> 59 #include <net/if_media.h> 60 #ifdef __FreeBSD__ 61 #include <net/ethernet.h> 62 #endif 63 #include <net/route.h> 64 65 #include <net80211/ieee80211_var.h> 66 67 #ifdef __NetBSD__ 68 #undef KASSERT 69 #define KASSERT(__cond, __complaint) FBSDKASSERT(__cond, __complaint) 70 #endif 71 72 enum { 73 ACL_POLICY_OPEN = 0, /* open, don't check ACL's */ 74 ACL_POLICY_ALLOW = 1, /* allow traffic from MAC */ 75 ACL_POLICY_DENY = 2, /* deny traffic from MAC */ 76 /* 77 * NB: ACL_POLICY_RADIUS must be the same value as 78 * IEEE80211_MACCMD_POLICY_RADIUS because of the way 79 * acl_getpolicy() works. 80 */ 81 ACL_POLICY_RADIUS = 7, /* defer to RADIUS ACL server */ 82 }; 83 84 #define ACL_HASHSIZE 32 85 86 struct acl { 87 TAILQ_ENTRY(acl) acl_list; 88 LIST_ENTRY(acl) acl_hash; 89 uint8_t acl_macaddr[IEEE80211_ADDR_LEN]; 90 }; 91 struct aclstate { 92 acl_lock_t as_lock; 93 int as_policy; 94 uint32_t as_nacls; 95 TAILQ_HEAD(, acl) as_list; /* list of all ACL's */ 96 LIST_HEAD(, acl) as_hash[ACL_HASHSIZE]; 97 struct ieee80211vap *as_vap; 98 }; 99 100 /* simple hash is enough for variation of macaddr */ 101 #define ACL_HASH(addr) \ 102 (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % ACL_HASHSIZE) 103 104 #ifdef __FreeBSD__ 105 static MALLOC_DEFINE(M_80211_ACL, "acl", "802.11 station acl"); 106 #endif 107 108 static int acl_free_all(struct ieee80211vap *); 109 110 /* number of references from net80211 layer */ 111 static int nrefs = 0; 112 113 static int 114 acl_attach(struct ieee80211vap *vap) 115 { 116 struct aclstate *as; 117 118 as = (struct aclstate *) IEEE80211_MALLOC(sizeof(struct aclstate), 119 M_80211_ACL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 120 if (as == NULL) 121 return 0; 122 ACL_LOCK_INIT(as, "acl"); 123 TAILQ_INIT(&as->as_list); 124 as->as_policy = ACL_POLICY_OPEN; 125 as->as_vap = vap; 126 vap->iv_as = as; 127 nrefs++; /* NB: we assume caller locking */ 128 return 1; 129 } 130 131 static void 132 acl_detach(struct ieee80211vap *vap) 133 { 134 struct aclstate *as = vap->iv_as; 135 136 KASSERT(nrefs > 0, ("imbalanced attach/detach")); 137 nrefs--; /* NB: we assume caller locking */ 138 139 acl_free_all(vap); 140 vap->iv_as = NULL; 141 ACL_LOCK_DESTROY(as); 142 IEEE80211_FREE(as, M_80211_ACL); 143 } 144 145 static __inline struct acl * 146 _find_acl(struct aclstate *as, const uint8_t *macaddr) 147 { 148 struct acl *acl; 149 int hash; 150 151 hash = ACL_HASH(macaddr); 152 LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) { 153 if (IEEE80211_ADDR_EQ(acl->acl_macaddr, macaddr)) 154 return acl; 155 } 156 return NULL; 157 } 158 159 static void 160 _acl_free(struct aclstate *as, struct acl *acl) 161 { 162 ACL_LOCK_ASSERT(as); 163 164 TAILQ_REMOVE(&as->as_list, acl, acl_list); 165 LIST_REMOVE(acl, acl_hash); 166 IEEE80211_FREE(acl, M_80211_ACL); 167 as->as_nacls--; 168 } 169 170 static int 171 acl_check(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 172 { 173 struct aclstate *as = vap->iv_as; 174 175 switch (as->as_policy) { 176 case ACL_POLICY_OPEN: 177 case ACL_POLICY_RADIUS: 178 return 1; 179 case ACL_POLICY_ALLOW: 180 return _find_acl(as, wh->i_addr2) != NULL; 181 case ACL_POLICY_DENY: 182 return _find_acl(as, wh->i_addr2) == NULL; 183 } 184 return 0; /* should not happen */ 185 } 186 187 static int 188 acl_add(struct ieee80211vap *vap, const uint8_t mac[IEEE80211_ADDR_LEN]) 189 { 190 struct aclstate *as = vap->iv_as; 191 struct acl *acl, *new; 192 int hash; 193 194 new = (struct acl *) IEEE80211_MALLOC(sizeof(struct acl), 195 M_80211_ACL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 196 if (new == NULL) { 197 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 198 "ACL: add %s failed, no memory\n", ether_sprintf(mac)); 199 /* XXX statistic */ 200 return ENOMEM; 201 } 202 203 ACL_LOCK(as); 204 hash = ACL_HASH(mac); 205 LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) { 206 if (IEEE80211_ADDR_EQ(acl->acl_macaddr, mac)) { 207 ACL_UNLOCK(as); 208 IEEE80211_FREE(new, M_80211_ACL); 209 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 210 "ACL: add %s failed, already present\n", 211 ether_sprintf(mac)); 212 return EEXIST; 213 } 214 } 215 IEEE80211_ADDR_COPY(new->acl_macaddr, mac); 216 TAILQ_INSERT_TAIL(&as->as_list, new, acl_list); 217 LIST_INSERT_HEAD(&as->as_hash[hash], new, acl_hash); 218 as->as_nacls++; 219 ACL_UNLOCK(as); 220 221 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 222 "ACL: add %s\n", ether_sprintf(mac)); 223 return 0; 224 } 225 226 static int 227 acl_remove(struct ieee80211vap *vap, const uint8_t mac[IEEE80211_ADDR_LEN]) 228 { 229 struct aclstate *as = vap->iv_as; 230 struct acl *acl; 231 232 ACL_LOCK(as); 233 acl = _find_acl(as, mac); 234 if (acl != NULL) 235 _acl_free(as, acl); 236 ACL_UNLOCK(as); 237 238 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 239 "ACL: remove %s%s\n", ether_sprintf(mac), 240 acl == NULL ? ", not present" : ""); 241 242 return (acl == NULL ? ENOENT : 0); 243 } 244 245 static int 246 acl_free_all(struct ieee80211vap *vap) 247 { 248 struct aclstate *as = vap->iv_as; 249 struct acl *acl; 250 251 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, "ACL: %s\n", "free all"); 252 253 ACL_LOCK(as); 254 while ((acl = TAILQ_FIRST(&as->as_list)) != NULL) 255 _acl_free(as, acl); 256 ACL_UNLOCK(as); 257 258 return 0; 259 } 260 261 static int 262 acl_setpolicy(struct ieee80211vap *vap, int policy) 263 { 264 struct aclstate *as = vap->iv_as; 265 266 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 267 "ACL: set policy to %u\n", policy); 268 269 switch (policy) { 270 case IEEE80211_MACCMD_POLICY_OPEN: 271 as->as_policy = ACL_POLICY_OPEN; 272 break; 273 case IEEE80211_MACCMD_POLICY_ALLOW: 274 as->as_policy = ACL_POLICY_ALLOW; 275 break; 276 case IEEE80211_MACCMD_POLICY_DENY: 277 as->as_policy = ACL_POLICY_DENY; 278 break; 279 case IEEE80211_MACCMD_POLICY_RADIUS: 280 as->as_policy = ACL_POLICY_RADIUS; 281 break; 282 default: 283 return EINVAL; 284 } 285 return 0; 286 } 287 288 static int 289 acl_getpolicy(struct ieee80211vap *vap) 290 { 291 struct aclstate *as = vap->iv_as; 292 293 return as->as_policy; 294 } 295 296 static int 297 acl_setioctl(struct ieee80211vap *vap, struct ieee80211req *ireq) 298 { 299 300 return EINVAL; 301 } 302 303 static int 304 acl_getioctl(struct ieee80211vap *vap, struct ieee80211req *ireq) 305 { 306 struct aclstate *as = vap->iv_as; 307 struct acl *acl; 308 struct ieee80211req_maclist *ap; 309 int error; 310 uint32_t i, space; 311 312 switch (ireq->i_val) { 313 case IEEE80211_MACCMD_POLICY: 314 ireq->i_val = as->as_policy; 315 return 0; 316 case IEEE80211_MACCMD_LIST: 317 space = as->as_nacls * IEEE80211_ADDR_LEN; 318 if (ireq->i_len == 0) { 319 ireq->i_len = space; /* return required space */ 320 return 0; /* NB: must not error */ 321 } 322 ap = (struct ieee80211req_maclist *) IEEE80211_MALLOC(space, 323 M_TEMP, IEEE80211_M_NOWAIT); 324 if (ap == NULL) 325 return ENOMEM; 326 i = 0; 327 ACL_LOCK(as); 328 TAILQ_FOREACH(acl, &as->as_list, acl_list) { 329 IEEE80211_ADDR_COPY(ap[i].ml_macaddr, acl->acl_macaddr); 330 i++; 331 } 332 ACL_UNLOCK(as); 333 if (ireq->i_len >= space) { 334 error = copyout(ap, ireq->i_data, space); 335 ireq->i_len = space; 336 } else 337 error = copyout(ap, ireq->i_data, ireq->i_len); 338 IEEE80211_FREE(ap, M_TEMP); 339 return error; 340 } 341 return EINVAL; 342 } 343 344 static const struct ieee80211_aclator mac = { 345 .iac_name = "mac", 346 .iac_attach = acl_attach, 347 .iac_detach = acl_detach, 348 .iac_check = acl_check, 349 .iac_add = acl_add, 350 .iac_remove = acl_remove, 351 .iac_flush = acl_free_all, 352 .iac_setpolicy = acl_setpolicy, 353 .iac_getpolicy = acl_getpolicy, 354 .iac_setioctl = acl_setioctl, 355 .iac_getioctl = acl_getioctl, 356 }; 357 IEEE80211_ACL_MODULE(wlan_acl, mac, 1); 358
Indexes created Thu Oct 02 14:10:14 GMT 2025