ieee80211_acl.c revision 1.9.54.4
1 /* $NetBSD: ieee80211_acl.c,v 1.9.54.4 2019/06/10 22:09:46 christos 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 __NetBSD__ 32 __KERNEL_RCSID(0, "$NetBSD: ieee80211_acl.c,v 1.9.54.4 2019/06/10 22:09:46 christos Exp $"); 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 #ifdef _KERNEL_OPT 47 #include "opt_wlan.h" 48 #endif 49 50 #include <sys/param.h> 51 #include <sys/kernel.h> 52 #include <sys/systm.h> 53 #include <sys/malloc.h> 54 #include <sys/mbuf.h> 55 #include <sys/module.h> 56 #include <sys/queue.h> 57 58 #include <sys/socket.h> 59 60 #include <net/if.h> 61 #include <net/if_media.h> 62 #if __FreeBSD__ 63 #include <net/ethernet.h> 64 #elif __NetBSD__ 65 #include <net/if_ether.h> 66 #endif 67 #include <net/route.h> 68 69 #include <net80211/ieee80211_var.h> 70 71 #ifdef __NetBSD__ 72 #undef KASSERT 73 #define KASSERT(__cond, __complaint) FBSDKASSERT(__cond, __complaint) 74 #endif 75 76 enum { 77 ACL_POLICY_OPEN = 0, /* open, don't check ACL's */ 78 ACL_POLICY_ALLOW = 1, /* allow traffic from MAC */ 79 ACL_POLICY_DENY = 2, /* deny traffic from MAC */ 80 /* 81 * NB: ACL_POLICY_RADIUS must be the same value as 82 * IEEE80211_MACCMD_POLICY_RADIUS because of the way 83 * acl_getpolicy() works. 84 */ 85 ACL_POLICY_RADIUS = 7, /* defer to RADIUS ACL server */ 86 }; 87 88 #define ACL_HASHSIZE 32 89 90 struct acl { 91 TAILQ_ENTRY(acl) acl_list; 92 LIST_ENTRY(acl) acl_hash; 93 uint8_t acl_macaddr[IEEE80211_ADDR_LEN]; 94 }; 95 struct aclstate { 96 acl_lock_t as_lock; 97 int as_policy; 98 uint32_t as_nacls; 99 TAILQ_HEAD(, acl) as_list; /* list of all ACL's */ 100 LIST_HEAD(, acl) as_hash[ACL_HASHSIZE]; 101 struct ieee80211vap *as_vap; 102 }; 103 104 /* simple hash is enough for variation of macaddr */ 105 #define ACL_HASH(addr) \ 106 (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % ACL_HASHSIZE) 107 108 #if __FreeBSD__ 109 static MALLOC_DEFINE(M_80211_ACL, "acl", "802.11 station acl"); 110 #endif 111 112 static int acl_free_all(struct ieee80211vap *); 113 114 /* number of references from net80211 layer */ 115 static int nrefs = 0; 116 117 static int 118 acl_attach(struct ieee80211vap *vap) 119 { 120 struct aclstate *as; 121 122 as = (struct aclstate *) IEEE80211_MALLOC(sizeof(struct aclstate), 123 M_80211_ACL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 124 if (as == NULL) 125 return 0; 126 ACL_LOCK_INIT(as, "acl"); 127 TAILQ_INIT(&as->as_list); 128 as->as_policy = ACL_POLICY_OPEN; 129 as->as_vap = vap; 130 vap->iv_as = as; 131 nrefs++; /* NB: we assume caller locking */ 132 return 1; 133 } 134 135 static void 136 acl_detach(struct ieee80211vap *vap) 137 { 138 struct aclstate *as = vap->iv_as; 139 140 KASSERT(nrefs > 0, ("imbalanced attach/detach")); 141 nrefs--; /* NB: we assume caller locking */ 142 143 acl_free_all(vap); 144 vap->iv_as = NULL; 145 ACL_LOCK_DESTROY(as); 146 IEEE80211_FREE(as, M_80211_ACL); 147 } 148 149 static __inline struct acl * 150 _find_acl(struct aclstate *as, const uint8_t *macaddr) 151 { 152 struct acl *acl; 153 int hash; 154 155 hash = ACL_HASH(macaddr); 156 LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) { 157 if (IEEE80211_ADDR_EQ(acl->acl_macaddr, macaddr)) 158 return acl; 159 } 160 return NULL; 161 } 162 163 static void 164 _acl_free(struct aclstate *as, struct acl *acl) 165 { 166 ACL_LOCK_ASSERT(as); 167 168 TAILQ_REMOVE(&as->as_list, acl, acl_list); 169 LIST_REMOVE(acl, acl_hash); 170 IEEE80211_FREE(acl, M_80211_ACL); 171 as->as_nacls--; 172 } 173 174 static int 175 acl_check(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 176 { 177 struct aclstate *as = vap->iv_as; 178 179 switch (as->as_policy) { 180 case ACL_POLICY_OPEN: 181 case ACL_POLICY_RADIUS: 182 return 1; 183 case ACL_POLICY_ALLOW: 184 return _find_acl(as, wh->i_addr2) != NULL; 185 case ACL_POLICY_DENY: 186 return _find_acl(as, wh->i_addr2) == NULL; 187 } 188 return 0; /* should not happen */ 189 } 190 191 static int 192 acl_add(struct ieee80211vap *vap, const uint8_t mac[IEEE80211_ADDR_LEN]) 193 { 194 struct aclstate *as = vap->iv_as; 195 struct acl *acl, *new; 196 int hash; 197 198 new = (struct acl *) IEEE80211_MALLOC(sizeof(struct acl), 199 M_80211_ACL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 200 if (new == NULL) { 201 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 202 "ACL: add %s failed, no memory\n", ether_sprintf(mac)); 203 /* XXX statistic */ 204 return ENOMEM; 205 } 206 207 ACL_LOCK(as); 208 hash = ACL_HASH(mac); 209 LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) { 210 if (IEEE80211_ADDR_EQ(acl->acl_macaddr, mac)) { 211 ACL_UNLOCK(as); 212 IEEE80211_FREE(new, M_80211_ACL); 213 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 214 "ACL: add %s failed, already present\n", 215 ether_sprintf(mac)); 216 return EEXIST; 217 } 218 } 219 IEEE80211_ADDR_COPY(new->acl_macaddr, mac); 220 TAILQ_INSERT_TAIL(&as->as_list, new, acl_list); 221 LIST_INSERT_HEAD(&as->as_hash[hash], new, acl_hash); 222 as->as_nacls++; 223 ACL_UNLOCK(as); 224 225 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 226 "ACL: add %s\n", ether_sprintf(mac)); 227 return 0; 228 } 229 230 static int 231 acl_remove(struct ieee80211vap *vap, const uint8_t mac[IEEE80211_ADDR_LEN]) 232 { 233 struct aclstate *as = vap->iv_as; 234 struct acl *acl; 235 236 ACL_LOCK(as); 237 acl = _find_acl(as, mac); 238 if (acl != NULL) 239 _acl_free(as, acl); 240 ACL_UNLOCK(as); 241 242 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 243 "ACL: remove %s%s\n", ether_sprintf(mac), 244 acl == NULL ? ", not present" : ""); 245 246 return (acl == NULL ? ENOENT : 0); 247 } 248 249 static int 250 acl_free_all(struct ieee80211vap *vap) 251 { 252 struct aclstate *as = vap->iv_as; 253 struct acl *acl; 254 255 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, "ACL: %s\n", "free all"); 256 257 ACL_LOCK(as); 258 while ((acl = TAILQ_FIRST(&as->as_list)) != NULL) 259 _acl_free(as, acl); 260 ACL_UNLOCK(as); 261 262 return 0; 263 } 264 265 static int 266 acl_setpolicy(struct ieee80211vap *vap, int policy) 267 { 268 struct aclstate *as = vap->iv_as; 269 270 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 271 "ACL: set policy to %u\n", policy); 272 273 switch (policy) { 274 case IEEE80211_MACCMD_POLICY_OPEN: 275 as->as_policy = ACL_POLICY_OPEN; 276 break; 277 case IEEE80211_MACCMD_POLICY_ALLOW: 278 as->as_policy = ACL_POLICY_ALLOW; 279 break; 280 case IEEE80211_MACCMD_POLICY_DENY: 281 as->as_policy = ACL_POLICY_DENY; 282 break; 283 case IEEE80211_MACCMD_POLICY_RADIUS: 284 as->as_policy = ACL_POLICY_RADIUS; 285 break; 286 default: 287 return EINVAL; 288 } 289 return 0; 290 } 291 292 static int 293 acl_getpolicy(struct ieee80211vap *vap) 294 { 295 struct aclstate *as = vap->iv_as; 296 297 return as->as_policy; 298 } 299 300 static int 301 acl_setioctl(struct ieee80211vap *vap, struct ieee80211req *ireq) 302 { 303 304 return EINVAL; 305 } 306 307 static int 308 acl_getioctl(struct ieee80211vap *vap, struct ieee80211req *ireq) 309 { 310 struct aclstate *as = vap->iv_as; 311 struct acl *acl; 312 struct ieee80211req_maclist *ap; 313 int error; 314 uint32_t i, space; 315 316 switch (ireq->i_val) { 317 case IEEE80211_MACCMD_POLICY: 318 ireq->i_val = as->as_policy; 319 return 0; 320 case IEEE80211_MACCMD_LIST: 321 space = as->as_nacls * IEEE80211_ADDR_LEN; 322 if (ireq->i_len == 0) { 323 ireq->i_len = space; /* return required space */ 324 return 0; /* NB: must not error */ 325 } 326 ap = (struct ieee80211req_maclist *) IEEE80211_MALLOC(space, 327 M_TEMP, IEEE80211_M_NOWAIT); 328 if (ap == NULL) 329 return ENOMEM; 330 i = 0; 331 ACL_LOCK(as); 332 TAILQ_FOREACH(acl, &as->as_list, acl_list) { 333 IEEE80211_ADDR_COPY(ap[i].ml_macaddr, acl->acl_macaddr); 334 i++; 335 } 336 ACL_UNLOCK(as); 337 if (ireq->i_len >= space) { 338 error = copyout(ap, ireq->i_data, space); 339 ireq->i_len = space; 340 } else 341 error = copyout(ap, ireq->i_data, ireq->i_len); 342 IEEE80211_FREE(ap, M_TEMP); 343 return error; 344 } 345 return EINVAL; 346 } 347 348 static const struct ieee80211_aclator mac = { 349 .iac_name = "mac", 350 .iac_attach = acl_attach, 351 .iac_detach = acl_detach, 352 .iac_check = acl_check, 353 .iac_add = acl_add, 354 .iac_remove = acl_remove, 355 .iac_flush = acl_free_all, 356 .iac_setpolicy = acl_setpolicy, 357 .iac_getpolicy = acl_getpolicy, 358 .iac_setioctl = acl_setioctl, 359 .iac_getioctl = acl_getioctl, 360 }; 361 IEEE80211_ACL_MODULE(wlan_acl, mac, 1); 362
Indexes created Fri Oct 03 02:09:57 GMT 2025