ieee80211_acl.c revision 1.9.54.3
1 /* $NetBSD: ieee80211_acl.c,v 1.9.54.3 2018/07/16 20:11:11 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 #if __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 #if __FreeBSD__ 61 #include <net/ethernet.h> 62 #elif __NetBSD__ 63 #include <net/if_ether.h> 64 #endif 65 #include <net/route.h> 66 67 #include <net80211/ieee80211_var.h> 68 69 #ifdef __NetBSD__ 70 #undef KASSERT 71 #define KASSERT(__cond, __complaint) FBSDKASSERT(__cond, __complaint) 72 #endif 73 74 enum { 75 ACL_POLICY_OPEN = 0, /* open, don't check ACL's */ 76 ACL_POLICY_ALLOW = 1, /* allow traffic from MAC */ 77 ACL_POLICY_DENY = 2, /* deny traffic from MAC */ 78 /* 79 * NB: ACL_POLICY_RADIUS must be the same value as 80 * IEEE80211_MACCMD_POLICY_RADIUS because of the way 81 * acl_getpolicy() works. 82 */ 83 ACL_POLICY_RADIUS = 7, /* defer to RADIUS ACL server */ 84 }; 85 86 #define ACL_HASHSIZE 32 87 88 struct acl { 89 TAILQ_ENTRY(acl) acl_list; 90 LIST_ENTRY(acl) acl_hash; 91 uint8_t acl_macaddr[IEEE80211_ADDR_LEN]; 92 }; 93 struct aclstate { 94 acl_lock_t as_lock; 95 int as_policy; 96 uint32_t as_nacls; 97 TAILQ_HEAD(, acl) as_list; /* list of all ACL's */ 98 LIST_HEAD(, acl) as_hash[ACL_HASHSIZE]; 99 struct ieee80211vap *as_vap; 100 }; 101 102 /* simple hash is enough for variation of macaddr */ 103 #define ACL_HASH(addr) \ 104 (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % ACL_HASHSIZE) 105 106 #if __FreeBSD__ 107 static MALLOC_DEFINE(M_80211_ACL, "acl", "802.11 station acl"); 108 #endif 109 110 static int acl_free_all(struct ieee80211vap *); 111 112 /* number of references from net80211 layer */ 113 static int nrefs = 0; 114 115 static int 116 acl_attach(struct ieee80211vap *vap) 117 { 118 struct aclstate *as; 119 120 as = (struct aclstate *) IEEE80211_MALLOC(sizeof(struct aclstate), 121 M_80211_ACL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 122 if (as == NULL) 123 return 0; 124 ACL_LOCK_INIT(as, "acl"); 125 TAILQ_INIT(&as->as_list); 126 as->as_policy = ACL_POLICY_OPEN; 127 as->as_vap = vap; 128 vap->iv_as = as; 129 nrefs++; /* NB: we assume caller locking */ 130 return 1; 131 } 132 133 static void 134 acl_detach(struct ieee80211vap *vap) 135 { 136 struct aclstate *as = vap->iv_as; 137 138 KASSERT(nrefs > 0, ("imbalanced attach/detach")); 139 nrefs--; /* NB: we assume caller locking */ 140 141 acl_free_all(vap); 142 vap->iv_as = NULL; 143 ACL_LOCK_DESTROY(as); 144 IEEE80211_FREE(as, M_80211_ACL); 145 } 146 147 static __inline struct acl * 148 _find_acl(struct aclstate *as, const uint8_t *macaddr) 149 { 150 struct acl *acl; 151 int hash; 152 153 hash = ACL_HASH(macaddr); 154 LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) { 155 if (IEEE80211_ADDR_EQ(acl->acl_macaddr, macaddr)) 156 return acl; 157 } 158 return NULL; 159 } 160 161 static void 162 _acl_free(struct aclstate *as, struct acl *acl) 163 { 164 ACL_LOCK_ASSERT(as); 165 166 TAILQ_REMOVE(&as->as_list, acl, acl_list); 167 LIST_REMOVE(acl, acl_hash); 168 IEEE80211_FREE(acl, M_80211_ACL); 169 as->as_nacls--; 170 } 171 172 static int 173 acl_check(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 174 { 175 struct aclstate *as = vap->iv_as; 176 177 switch (as->as_policy) { 178 case ACL_POLICY_OPEN: 179 case ACL_POLICY_RADIUS: 180 return 1; 181 case ACL_POLICY_ALLOW: 182 return _find_acl(as, wh->i_addr2) != NULL; 183 case ACL_POLICY_DENY: 184 return _find_acl(as, wh->i_addr2) == NULL; 185 } 186 return 0; /* should not happen */ 187 } 188 189 static int 190 acl_add(struct ieee80211vap *vap, const uint8_t mac[IEEE80211_ADDR_LEN]) 191 { 192 struct aclstate *as = vap->iv_as; 193 struct acl *acl, *new; 194 int hash; 195 196 new = (struct acl *) IEEE80211_MALLOC(sizeof(struct acl), 197 M_80211_ACL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 198 if (new == NULL) { 199 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 200 "ACL: add %s failed, no memory\n", ether_sprintf(mac)); 201 /* XXX statistic */ 202 return ENOMEM; 203 } 204 205 ACL_LOCK(as); 206 hash = ACL_HASH(mac); 207 LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) { 208 if (IEEE80211_ADDR_EQ(acl->acl_macaddr, mac)) { 209 ACL_UNLOCK(as); 210 IEEE80211_FREE(new, M_80211_ACL); 211 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 212 "ACL: add %s failed, already present\n", 213 ether_sprintf(mac)); 214 return EEXIST; 215 } 216 } 217 IEEE80211_ADDR_COPY(new->acl_macaddr, mac); 218 TAILQ_INSERT_TAIL(&as->as_list, new, acl_list); 219 LIST_INSERT_HEAD(&as->as_hash[hash], new, acl_hash); 220 as->as_nacls++; 221 ACL_UNLOCK(as); 222 223 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 224 "ACL: add %s\n", ether_sprintf(mac)); 225 return 0; 226 } 227 228 static int 229 acl_remove(struct ieee80211vap *vap, const uint8_t mac[IEEE80211_ADDR_LEN]) 230 { 231 struct aclstate *as = vap->iv_as; 232 struct acl *acl; 233 234 ACL_LOCK(as); 235 acl = _find_acl(as, mac); 236 if (acl != NULL) 237 _acl_free(as, acl); 238 ACL_UNLOCK(as); 239 240 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 241 "ACL: remove %s%s\n", ether_sprintf(mac), 242 acl == NULL ? ", not present" : ""); 243 244 return (acl == NULL ? ENOENT : 0); 245 } 246 247 static int 248 acl_free_all(struct ieee80211vap *vap) 249 { 250 struct aclstate *as = vap->iv_as; 251 struct acl *acl; 252 253 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, "ACL: %s\n", "free all"); 254 255 ACL_LOCK(as); 256 while ((acl = TAILQ_FIRST(&as->as_list)) != NULL) 257 _acl_free(as, acl); 258 ACL_UNLOCK(as); 259 260 return 0; 261 } 262 263 static int 264 acl_setpolicy(struct ieee80211vap *vap, int policy) 265 { 266 struct aclstate *as = vap->iv_as; 267 268 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, 269 "ACL: set policy to %u\n", policy); 270 271 switch (policy) { 272 case IEEE80211_MACCMD_POLICY_OPEN: 273 as->as_policy = ACL_POLICY_OPEN; 274 break; 275 case IEEE80211_MACCMD_POLICY_ALLOW: 276 as->as_policy = ACL_POLICY_ALLOW; 277 break; 278 case IEEE80211_MACCMD_POLICY_DENY: 279 as->as_policy = ACL_POLICY_DENY; 280 break; 281 case IEEE80211_MACCMD_POLICY_RADIUS: 282 as->as_policy = ACL_POLICY_RADIUS; 283 break; 284 default: 285 return EINVAL; 286 } 287 return 0; 288 } 289 290 static int 291 acl_getpolicy(struct ieee80211vap *vap) 292 { 293 struct aclstate *as = vap->iv_as; 294 295 return as->as_policy; 296 } 297 298 static int 299 acl_setioctl(struct ieee80211vap *vap, struct ieee80211req *ireq) 300 { 301 302 return EINVAL; 303 } 304 305 static int 306 acl_getioctl(struct ieee80211vap *vap, struct ieee80211req *ireq) 307 { 308 struct aclstate *as = vap->iv_as; 309 struct acl *acl; 310 struct ieee80211req_maclist *ap; 311 int error; 312 uint32_t i, space; 313 314 switch (ireq->i_val) { 315 case IEEE80211_MACCMD_POLICY: 316 ireq->i_val = as->as_policy; 317 return 0; 318 case IEEE80211_MACCMD_LIST: 319 space = as->as_nacls * IEEE80211_ADDR_LEN; 320 if (ireq->i_len == 0) { 321 ireq->i_len = space; /* return required space */ 322 return 0; /* NB: must not error */ 323 } 324 ap = (struct ieee80211req_maclist *) IEEE80211_MALLOC(space, 325 M_TEMP, IEEE80211_M_NOWAIT); 326 if (ap == NULL) 327 return ENOMEM; 328 i = 0; 329 ACL_LOCK(as); 330 TAILQ_FOREACH(acl, &as->as_list, acl_list) { 331 IEEE80211_ADDR_COPY(ap[i].ml_macaddr, acl->acl_macaddr); 332 i++; 333 } 334 ACL_UNLOCK(as); 335 if (ireq->i_len >= space) { 336 error = copyout(ap, ireq->i_data, space); 337 ireq->i_len = space; 338 } else 339 error = copyout(ap, ireq->i_data, ireq->i_len); 340 IEEE80211_FREE(ap, M_TEMP); 341 return error; 342 } 343 return EINVAL; 344 } 345 346 static const struct ieee80211_aclator mac = { 347 .iac_name = "mac", 348 .iac_attach = acl_attach, 349 .iac_detach = acl_detach, 350 .iac_check = acl_check, 351 .iac_add = acl_add, 352 .iac_remove = acl_remove, 353 .iac_flush = acl_free_all, 354 .iac_setpolicy = acl_setpolicy, 355 .iac_getpolicy = acl_getpolicy, 356 .iac_setioctl = acl_setioctl, 357 .iac_getioctl = acl_getioctl, 358 }; 359 IEEE80211_ACL_MODULE(wlan_acl, mac, 1); 360
Indexes created Thu Oct 02 14:10:14 GMT 2025