1 /* $OpenBSD: ieee80211_node.c,v 1.190 2021/12/07 20:06:38 stsp Exp $ */ 2 /* $NetBSD: ieee80211_node.c,v 1.14 2004/05/09 09:18:47 dyoung Exp $ */ 3 4 /*- 5 * Copyright (c) 2001 Atsushi Onoe 6 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 7 * Copyright (c) 2008 Damien Bergamini 8 * All rights reserved. 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 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include "bridge.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/mbuf.h> 38 #include <sys/malloc.h> 39 #include <sys/kernel.h> 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/endian.h> 43 #include <sys/errno.h> 44 #include <sys/sysctl.h> 45 #include <sys/tree.h> 46 47 #include <net/if.h> 48 #include <net/if_dl.h> 49 #include <net/if_media.h> 50 51 #include <netinet/in.h> 52 #include <netinet/if_ether.h> 53 54 #if NBRIDGE > 0 55 #include <net/if_bridge.h> 56 #endif 57 58 #include <net80211/ieee80211_var.h> 59 #include <net80211/ieee80211_priv.h> 60 61 struct ieee80211_node *ieee80211_node_alloc(struct ieee80211com *); 62 void ieee80211_node_free(struct ieee80211com *, struct ieee80211_node *); 63 void ieee80211_node_copy(struct ieee80211com *, struct ieee80211_node *, 64 const struct ieee80211_node *); 65 void ieee80211_choose_rsnparams(struct ieee80211com *); 66 u_int8_t ieee80211_node_getrssi(struct ieee80211com *, 67 const struct ieee80211_node *); 68 int ieee80211_node_checkrssi(struct ieee80211com *, 69 const struct ieee80211_node *); 70 int ieee80211_ess_is_better(struct ieee80211com *ic, struct ieee80211_node *, 71 struct ieee80211_node *); 72 void ieee80211_node_set_timeouts(struct ieee80211_node *); 73 void ieee80211_setup_node(struct ieee80211com *, struct ieee80211_node *, 74 const u_int8_t *); 75 struct ieee80211_node *ieee80211_alloc_node_helper(struct ieee80211com *); 76 void ieee80211_node_free_unref_cb(struct ieee80211_node *); 77 void ieee80211_node_tx_flushed(struct ieee80211com *, struct ieee80211_node *); 78 void ieee80211_node_switch_bss(struct ieee80211com *, struct ieee80211_node *); 79 void ieee80211_node_addba_request(struct ieee80211_node *, int); 80 void ieee80211_node_addba_request_ac_be_to(void *); 81 void ieee80211_node_addba_request_ac_bk_to(void *); 82 void ieee80211_node_addba_request_ac_vi_to(void *); 83 void ieee80211_node_addba_request_ac_vo_to(void *); 84 void ieee80211_needs_auth(struct ieee80211com *, struct ieee80211_node *); 85 #ifndef IEEE80211_STA_ONLY 86 void ieee80211_node_join_ht(struct ieee80211com *, struct ieee80211_node *); 87 void ieee80211_node_join_rsn(struct ieee80211com *, struct ieee80211_node *); 88 void ieee80211_node_join_11g(struct ieee80211com *, struct ieee80211_node *); 89 void ieee80211_node_leave_ht(struct ieee80211com *, struct ieee80211_node *); 90 void ieee80211_node_leave_rsn(struct ieee80211com *, struct ieee80211_node *); 91 void ieee80211_node_leave_11g(struct ieee80211com *, struct ieee80211_node *); 92 void ieee80211_node_leave_pwrsave(struct ieee80211com *, 93 struct ieee80211_node *); 94 void ieee80211_inact_timeout(void *); 95 void ieee80211_node_cache_timeout(void *); 96 #endif 97 void ieee80211_clean_inactive_nodes(struct ieee80211com *, int); 98 99 #ifndef IEEE80211_STA_ONLY 100 void 101 ieee80211_inact_timeout(void *arg) 102 { 103 struct ieee80211com *ic = arg; 104 struct ieee80211_node *ni, *next_ni; 105 int s; 106 107 s = splnet(); 108 for (ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); 109 ni != NULL; ni = next_ni) { 110 next_ni = RBT_NEXT(ieee80211_tree, ni); 111 if (ni->ni_refcnt > 0) 112 continue; 113 if (ni->ni_inact < IEEE80211_INACT_MAX) 114 ni->ni_inact++; 115 } 116 splx(s); 117 118 timeout_add_sec(&ic->ic_inact_timeout, IEEE80211_INACT_WAIT); 119 } 120 121 void 122 ieee80211_node_cache_timeout(void *arg) 123 { 124 struct ieee80211com *ic = arg; 125 126 ieee80211_clean_nodes(ic, 1); 127 timeout_add_sec(&ic->ic_node_cache_timeout, IEEE80211_CACHE_WAIT); 128 } 129 #endif 130 131 /* 132 * For debug purposes 133 */ 134 void 135 ieee80211_print_ess(struct ieee80211_ess *ess) 136 { 137 ieee80211_print_essid(ess->essid, ess->esslen); 138 if (ess->flags & IEEE80211_F_RSNON) { 139 printf(" wpa"); 140 if (ess->rsnprotos & IEEE80211_PROTO_RSN) 141 printf(",wpa2"); 142 if (ess->rsnprotos & IEEE80211_PROTO_WPA) 143 printf(",wpa1"); 144 145 if (ess->rsnakms & IEEE80211_AKM_8021X || 146 ess->rsnakms & IEEE80211_AKM_SHA256_8021X) 147 printf(",802.1x"); 148 printf(" "); 149 150 if (ess->rsnciphers & IEEE80211_CIPHER_USEGROUP) 151 printf(" usegroup"); 152 if (ess->rsnciphers & IEEE80211_CIPHER_WEP40) 153 printf(" wep40"); 154 if (ess->rsnciphers & IEEE80211_CIPHER_WEP104) 155 printf(" wep104"); 156 if (ess->rsnciphers & IEEE80211_CIPHER_TKIP) 157 printf(" tkip"); 158 if (ess->rsnciphers & IEEE80211_CIPHER_CCMP) 159 printf(" ccmp"); 160 } 161 if (ess->flags & IEEE80211_F_WEPON) { 162 int i = ess->def_txkey; 163 164 printf(" wep,"); 165 if (ess->nw_keys[i].k_cipher & IEEE80211_CIPHER_WEP40) 166 printf("wep40"); 167 if (ess->nw_keys[i].k_cipher & IEEE80211_CIPHER_WEP104) 168 printf("wep104"); 169 } 170 if (ess->flags == 0) 171 printf(" clear"); 172 printf("\n"); 173 } 174 175 void 176 ieee80211_print_ess_list(struct ieee80211com *ic) 177 { 178 struct ifnet *ifp = &ic->ic_if; 179 struct ieee80211_ess *ess; 180 181 printf("%s: known networks\n", ifp->if_xname); 182 TAILQ_FOREACH(ess, &ic->ic_ess, ess_next) { 183 ieee80211_print_ess(ess); 184 } 185 } 186 187 struct ieee80211_ess * 188 ieee80211_get_ess(struct ieee80211com *ic, const char *nwid, int len) 189 { 190 struct ieee80211_ess *ess; 191 192 TAILQ_FOREACH(ess, &ic->ic_ess, ess_next) { 193 if (len == ess->esslen && 194 memcmp(ess->essid, nwid, ess->esslen) == 0) 195 return ess; 196 } 197 198 return NULL; 199 } 200 201 void 202 ieee80211_del_ess(struct ieee80211com *ic, char *nwid, int len, int all) 203 { 204 struct ieee80211_ess *ess, *next; 205 206 TAILQ_FOREACH_SAFE(ess, &ic->ic_ess, ess_next, next) { 207 if (all == 1 || (ess->esslen == len && 208 memcmp(ess->essid, nwid, len) == 0)) { 209 TAILQ_REMOVE(&ic->ic_ess, ess, ess_next); 210 explicit_bzero(ess, sizeof(*ess)); 211 free(ess, M_DEVBUF, sizeof(*ess)); 212 if (TAILQ_EMPTY(&ic->ic_ess)) 213 ic->ic_flags &= ~IEEE80211_F_AUTO_JOIN; 214 if (all != 1) 215 return; 216 } 217 } 218 } 219 220 /* Keep in sync with ieee80211_ioctl.c:ieee80211_ioctl_setnwkeys() */ 221 static int 222 ieee80211_ess_setnwkeys(struct ieee80211_ess *ess, 223 const struct ieee80211_nwkey *nwkey) 224 { 225 struct ieee80211_key *k; 226 int error, i; 227 228 if (nwkey->i_wepon == IEEE80211_NWKEY_OPEN) { 229 if (!(ess->flags & IEEE80211_F_WEPON)) 230 return 0; 231 ess->flags &= ~IEEE80211_F_WEPON; 232 return ENETRESET; 233 } 234 if (nwkey->i_defkid < 1 || nwkey->i_defkid > IEEE80211_WEP_NKID) 235 return EINVAL; 236 237 for (i = 0; i < IEEE80211_WEP_NKID; i++) { 238 if (nwkey->i_key[i].i_keylen == 0 || 239 nwkey->i_key[i].i_keydat == NULL) 240 continue; /* entry not set */ 241 if (nwkey->i_key[i].i_keylen > IEEE80211_KEYBUF_SIZE) 242 return EINVAL; 243 244 /* map wep key to ieee80211_key */ 245 k = &ess->nw_keys[i]; 246 memset(k, 0, sizeof(*k)); 247 if (nwkey->i_key[i].i_keylen <= 5) 248 k->k_cipher = IEEE80211_CIPHER_WEP40; 249 else 250 k->k_cipher = IEEE80211_CIPHER_WEP104; 251 k->k_len = ieee80211_cipher_keylen(k->k_cipher); 252 k->k_flags = IEEE80211_KEY_GROUP | IEEE80211_KEY_TX; 253 error = copyin(nwkey->i_key[i].i_keydat, k->k_key, k->k_len); 254 if (error != 0) 255 return error; 256 } 257 ess->def_txkey = nwkey->i_defkid - 1; 258 ess->flags |= IEEE80211_F_WEPON; 259 260 return ENETRESET; 261 } 262 263 264 /* Keep in sync with ieee80211_ioctl.c:ieee80211_ioctl_setwpaparms() */ 265 static int 266 ieee80211_ess_setwpaparms(struct ieee80211_ess *ess, 267 const struct ieee80211_wpaparams *wpa) 268 { 269 if (!wpa->i_enabled) { 270 if (!(ess->flags & IEEE80211_F_RSNON)) 271 return 0; 272 ess->flags &= ~IEEE80211_F_RSNON; 273 ess->rsnprotos = 0; 274 ess->rsnakms = 0; 275 ess->rsngroupcipher = 0; 276 ess->rsnciphers = 0; 277 return ENETRESET; 278 } 279 280 ess->rsnprotos = 0; 281 if (wpa->i_protos & IEEE80211_WPA_PROTO_WPA1) 282 ess->rsnprotos |= IEEE80211_PROTO_WPA; 283 if (wpa->i_protos & IEEE80211_WPA_PROTO_WPA2) 284 ess->rsnprotos |= IEEE80211_PROTO_RSN; 285 if (ess->rsnprotos == 0) /* set to default (RSN) */ 286 ess->rsnprotos = IEEE80211_PROTO_RSN; 287 288 ess->rsnakms = 0; 289 if (wpa->i_akms & IEEE80211_WPA_AKM_PSK) 290 ess->rsnakms |= IEEE80211_AKM_PSK; 291 if (wpa->i_akms & IEEE80211_WPA_AKM_SHA256_PSK) 292 ess->rsnakms |= IEEE80211_AKM_SHA256_PSK; 293 if (wpa->i_akms & IEEE80211_WPA_AKM_8021X) 294 ess->rsnakms |= IEEE80211_AKM_8021X; 295 if (wpa->i_akms & IEEE80211_WPA_AKM_SHA256_8021X) 296 ess->rsnakms |= IEEE80211_AKM_SHA256_8021X; 297 if (ess->rsnakms == 0) /* set to default (PSK) */ 298 ess->rsnakms = IEEE80211_AKM_PSK; 299 300 if (wpa->i_groupcipher == IEEE80211_WPA_CIPHER_WEP40) 301 ess->rsngroupcipher = IEEE80211_CIPHER_WEP40; 302 else if (wpa->i_groupcipher == IEEE80211_WPA_CIPHER_TKIP) 303 ess->rsngroupcipher = IEEE80211_CIPHER_TKIP; 304 else if (wpa->i_groupcipher == IEEE80211_WPA_CIPHER_CCMP) 305 ess->rsngroupcipher = IEEE80211_CIPHER_CCMP; 306 else if (wpa->i_groupcipher == IEEE80211_WPA_CIPHER_WEP104) 307 ess->rsngroupcipher = IEEE80211_CIPHER_WEP104; 308 else { /* set to default */ 309 if (ess->rsnprotos & IEEE80211_PROTO_WPA) 310 ess->rsngroupcipher = IEEE80211_CIPHER_TKIP; 311 else 312 ess->rsngroupcipher = IEEE80211_CIPHER_CCMP; 313 } 314 315 ess->rsnciphers = 0; 316 if (wpa->i_ciphers & IEEE80211_WPA_CIPHER_TKIP) 317 ess->rsnciphers |= IEEE80211_CIPHER_TKIP; 318 if (wpa->i_ciphers & IEEE80211_WPA_CIPHER_CCMP) 319 ess->rsnciphers |= IEEE80211_CIPHER_CCMP; 320 if (wpa->i_ciphers & IEEE80211_WPA_CIPHER_USEGROUP) 321 ess->rsnciphers = IEEE80211_CIPHER_USEGROUP; 322 if (ess->rsnciphers == 0) { /* set to default (CCMP, TKIP if WPA1) */ 323 ess->rsnciphers = IEEE80211_CIPHER_CCMP; 324 if (ess->rsnprotos & IEEE80211_PROTO_WPA) 325 ess->rsnciphers |= IEEE80211_CIPHER_TKIP; 326 } 327 328 ess->flags |= IEEE80211_F_RSNON; 329 330 if (ess->rsnakms & 331 (IEEE80211_AKM_8021X|IEEE80211_WPA_AKM_SHA256_8021X)) 332 ess->flags |= IEEE80211_JOIN_8021X; 333 334 return ENETRESET; 335 } 336 337 static void 338 ieee80211_ess_clear_wep(struct ieee80211_ess *ess) 339 { 340 int i; 341 342 /* Disable WEP */ 343 for (i = 0; i < IEEE80211_WEP_NKID; i++) { 344 explicit_bzero(&ess->nw_keys[i], sizeof(ess->nw_keys[0])); 345 } 346 ess->def_txkey = 0; 347 ess->flags &= ~IEEE80211_F_WEPON; 348 } 349 350 static void 351 ieee80211_ess_clear_wpa(struct ieee80211_ess *ess) 352 { 353 /* Disable WPA */ 354 ess->rsnprotos = ess->rsnakms = ess->rsngroupcipher = 355 ess->rsnciphers = 0; 356 explicit_bzero(ess->psk, sizeof(ess->psk)); 357 ess->flags &= ~(IEEE80211_F_PSK | IEEE80211_F_RSNON); 358 } 359 360 int 361 ieee80211_add_ess(struct ieee80211com *ic, struct ieee80211_join *join) 362 { 363 struct ieee80211_ess *ess; 364 int new = 0, ness = 0; 365 366 /* only valid for station (aka, client) mode */ 367 if (ic->ic_opmode != IEEE80211_M_STA) 368 return (0); 369 370 TAILQ_FOREACH(ess, &ic->ic_ess, ess_next) { 371 if (ess->esslen == join->i_len && 372 memcmp(ess->essid, join->i_nwid, ess->esslen) == 0) 373 break; 374 ness++; 375 } 376 377 if (ess == NULL) { 378 /* if not found, and wpa/wep are set, then return */ 379 if ((join->i_flags & IEEE80211_JOIN_WPA) && 380 (join->i_flags & IEEE80211_JOIN_NWKEY)) { 381 return (EINVAL); 382 } 383 if (ness > IEEE80211_CACHE_SIZE) 384 return (ERANGE); 385 new = 1; 386 ess = malloc(sizeof(*ess), M_DEVBUF, M_NOWAIT|M_ZERO); 387 if (ess == NULL) 388 return (ENOMEM); 389 memcpy(ess->essid, join->i_nwid, join->i_len); 390 ess->esslen = join->i_len; 391 } 392 393 if (join->i_flags & IEEE80211_JOIN_WPA) { 394 if (join->i_wpaparams.i_enabled) { 395 if (!(ic->ic_caps & IEEE80211_C_RSN)) { 396 free(ess, M_DEVBUF, sizeof(*ess)); 397 return ENODEV; 398 } 399 ieee80211_ess_setwpaparms(ess, 400 &join->i_wpaparams); 401 if (join->i_flags & IEEE80211_JOIN_WPAPSK) { 402 ess->flags |= IEEE80211_F_PSK; 403 explicit_bzero(ess->psk, sizeof(ess->psk)); 404 memcpy(ess->psk, &join->i_wpapsk.i_psk, 405 sizeof(ess->psk)); 406 } 407 ieee80211_ess_clear_wep(ess); 408 } else { 409 ieee80211_ess_clear_wpa(ess); 410 } 411 } else if (join->i_flags & IEEE80211_JOIN_NWKEY) { 412 if (join->i_nwkey.i_wepon) { 413 if (!(ic->ic_caps & IEEE80211_C_WEP)) { 414 free(ess, M_DEVBUF, sizeof(*ess)); 415 return ENODEV; 416 } 417 ieee80211_ess_setnwkeys(ess, &join->i_nwkey); 418 ieee80211_ess_clear_wpa(ess); 419 } else { 420 ieee80211_ess_clear_wep(ess); 421 } 422 } 423 424 if (new) 425 TAILQ_INSERT_TAIL(&ic->ic_ess, ess, ess_next); 426 427 return (0); 428 } 429 430 uint8_t 431 ieee80211_ess_adjust_rssi(struct ieee80211com *ic, struct ieee80211_node *ni) 432 { 433 uint8_t rssi = ni->ni_rssi; 434 435 /* 436 * Slightly punish 2 GHz RSSI values since they are usually 437 * stronger than 5 GHz RSSI values. 438 */ 439 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) { 440 if (ic->ic_max_rssi) { 441 uint8_t p = (5 * ic->ic_max_rssi) / 100; 442 if (rssi >= p) 443 rssi -= p; /* punish by 5% */ 444 } else { 445 if (rssi >= 8) 446 rssi -= 8; /* punish by 8 dBm */ 447 } 448 } 449 450 return rssi; 451 } 452 453 int 454 ieee80211_ess_calculate_score(struct ieee80211com *ic, 455 struct ieee80211_node *ni) 456 { 457 int score = 0; 458 uint8_t min_5ghz_rssi; 459 460 if (ic->ic_max_rssi) 461 min_5ghz_rssi = IEEE80211_RSSI_THRES_RATIO_5GHZ; 462 else 463 min_5ghz_rssi = (uint8_t)IEEE80211_RSSI_THRES_5GHZ; 464 465 /* not using join any */ 466 if (ieee80211_get_ess(ic, ni->ni_essid, ni->ni_esslen)) 467 score += 32; 468 469 /* Calculate the crypto score */ 470 if (ni->ni_rsnprotos & IEEE80211_PROTO_RSN) 471 score += 16; 472 if (ni->ni_rsnprotos & IEEE80211_PROTO_WPA) 473 score += 8; 474 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) 475 score += 4; 476 477 /* 5GHz with a good signal */ 478 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan) && 479 ni->ni_rssi > min_5ghz_rssi) 480 score += 2; 481 482 /* Boost this AP if it had no auth/assoc failures in the past. */ 483 if (ni->ni_fails == 0) 484 score += 21; 485 486 return score; 487 } 488 489 /* 490 * Given two APs, determine the "better" one of the two. 491 * We compute a score based on the following attributes: 492 * 493 * crypto: wpa2 > wpa1 > wep > open 494 * band: 5 GHz > 2 GHz provided 5 GHz rssi is above threshold 495 * rssi: rssi1 > rssi2 as a numeric comparison with a slight 496 * disadvantage for 2 GHz APs 497 * 498 * Crypto carries most weight, followed by band, followed by rssi. 499 */ 500 int 501 ieee80211_ess_is_better(struct ieee80211com *ic, 502 struct ieee80211_node *nicur, struct ieee80211_node *nican) 503 { 504 struct ifnet *ifp = &ic->ic_if; 505 int score_cur = 0, score_can = 0; 506 int cur_rssi, can_rssi; 507 508 score_cur = ieee80211_ess_calculate_score(ic, nicur); 509 score_can = ieee80211_ess_calculate_score(ic, nican); 510 511 cur_rssi = ieee80211_ess_adjust_rssi(ic, nicur); 512 can_rssi = ieee80211_ess_adjust_rssi(ic, nican); 513 514 if (can_rssi > cur_rssi) 515 score_can++; 516 517 if ((ifp->if_flags & IFF_DEBUG) && (score_can <= score_cur)) { 518 printf("%s: AP %s ", ifp->if_xname, 519 ether_sprintf(nican->ni_bssid)); 520 ieee80211_print_essid(nican->ni_essid, nican->ni_esslen); 521 printf(" score %d\n", score_can); 522 } 523 524 return score_can > score_cur; 525 } 526 527 /* Determine whether a candidate AP belongs to a given ESS. */ 528 int 529 ieee80211_match_ess(struct ieee80211_ess *ess, struct ieee80211_node *ni) 530 { 531 if (ess->esslen != 0 && 532 (ess->esslen != ni->ni_esslen || 533 memcmp(ess->essid, ni->ni_essid, ess->esslen) != 0)) { 534 ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_ESSID; 535 return 0; 536 } 537 538 if (ess->flags & (IEEE80211_F_PSK | IEEE80211_F_RSNON)) { 539 /* Ensure same WPA version. */ 540 if ((ni->ni_rsnprotos & IEEE80211_PROTO_RSN) && 541 (ess->rsnprotos & IEEE80211_PROTO_RSN) == 0) { 542 ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; 543 return 0; 544 } 545 if ((ni->ni_rsnprotos & IEEE80211_PROTO_WPA) && 546 (ess->rsnprotos & IEEE80211_PROTO_WPA) == 0) { 547 ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; 548 return 0; 549 } 550 } else if (ess->flags & IEEE80211_F_WEPON) { 551 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) { 552 ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_PRIVACY; 553 return 0; 554 } 555 } else { 556 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) != 0) { 557 ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_PRIVACY; 558 return 0; 559 } 560 } 561 562 if (ess->esslen == 0 && 563 (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) != 0) { 564 ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_PRIVACY; 565 return 0; 566 } 567 568 return 1; 569 } 570 571 void 572 ieee80211_switch_ess(struct ieee80211com *ic) 573 { 574 struct ifnet *ifp = &ic->ic_if; 575 struct ieee80211_ess *ess, *seless = NULL; 576 struct ieee80211_node *ni, *selni = NULL; 577 578 if (!ISSET(ifp->if_flags, IFF_RUNNING)) 579 return; 580 581 /* Find the best AP matching an entry on our ESS join list. */ 582 RBT_FOREACH(ni, ieee80211_tree, &ic->ic_tree) { 583 if ((ic->ic_flags & IEEE80211_F_DESBSSID) && 584 !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) 585 continue; 586 587 TAILQ_FOREACH(ess, &ic->ic_ess, ess_next) { 588 if (ieee80211_match_ess(ess, ni)) 589 break; 590 } 591 if (ess == NULL) 592 continue; 593 594 /* 595 * Operate only on ic_des_essid if auto-join is disabled. 596 * We might have a password stored for this network. 597 */ 598 if (!ISSET(ic->ic_flags, IEEE80211_F_AUTO_JOIN)) { 599 if (ic->ic_des_esslen == ni->ni_esslen && 600 memcmp(ic->ic_des_essid, ni->ni_essid, 601 ni->ni_esslen) == 0) { 602 ieee80211_set_ess(ic, ess, ni); 603 return; 604 } 605 continue; 606 } 607 608 if (selni == NULL) { 609 seless = ess; 610 selni = ni; 611 continue; 612 } 613 614 if (ieee80211_ess_is_better(ic, selni, ni)) { 615 seless = ess; 616 selni = ni; 617 } 618 } 619 620 if (selni && seless && !(selni->ni_esslen == ic->ic_des_esslen && 621 (memcmp(ic->ic_des_essid, selni->ni_essid, 622 IEEE80211_NWID_LEN) == 0))) { 623 if (ifp->if_flags & IFF_DEBUG) { 624 printf("%s: best AP %s ", ifp->if_xname, 625 ether_sprintf(selni->ni_bssid)); 626 ieee80211_print_essid(selni->ni_essid, 627 selni->ni_esslen); 628 printf(" score %d\n", 629 ieee80211_ess_calculate_score(ic, selni)); 630 printf("%s: switching to network ", ifp->if_xname); 631 ieee80211_print_essid(selni->ni_essid, 632 selni->ni_esslen); 633 if (seless->esslen == 0) 634 printf(" via join any"); 635 printf("\n"); 636 637 } 638 ieee80211_set_ess(ic, seless, selni); 639 } 640 } 641 642 void 643 ieee80211_set_ess(struct ieee80211com *ic, struct ieee80211_ess *ess, 644 struct ieee80211_node *ni) 645 { 646 memset(ic->ic_des_essid, 0, IEEE80211_NWID_LEN); 647 ic->ic_des_esslen = ni->ni_esslen; 648 memcpy(ic->ic_des_essid, ni->ni_essid, ic->ic_des_esslen); 649 650 ieee80211_disable_wep(ic); 651 ieee80211_disable_rsn(ic); 652 653 if (ess->flags & IEEE80211_F_RSNON) { 654 explicit_bzero(ic->ic_psk, sizeof(ic->ic_psk)); 655 memcpy(ic->ic_psk, ess->psk, sizeof(ic->ic_psk)); 656 657 ic->ic_rsnprotos = ess->rsnprotos; 658 ic->ic_rsnakms = ess->rsnakms; 659 ic->ic_rsngroupcipher = ess->rsngroupcipher; 660 ic->ic_rsnciphers = ess->rsnciphers; 661 ic->ic_flags |= IEEE80211_F_RSNON; 662 if (ess->flags & IEEE80211_F_PSK) 663 ic->ic_flags |= IEEE80211_F_PSK; 664 } else if (ess->flags & IEEE80211_F_WEPON) { 665 struct ieee80211_key *k; 666 int i; 667 668 for (i = 0; i < IEEE80211_WEP_NKID; i++) { 669 k = &ic->ic_nw_keys[i]; 670 if (k->k_cipher != IEEE80211_CIPHER_NONE) 671 (*ic->ic_delete_key)(ic, NULL, k); 672 memcpy(&ic->ic_nw_keys[i], &ess->nw_keys[i], 673 sizeof(struct ieee80211_key)); 674 if (k->k_cipher != IEEE80211_CIPHER_NONE) 675 (*ic->ic_set_key)(ic, NULL, k); 676 } 677 ic->ic_def_txkey = ess->def_txkey; 678 ic->ic_flags |= IEEE80211_F_WEPON; 679 } 680 } 681 682 void 683 ieee80211_deselect_ess(struct ieee80211com *ic) 684 { 685 memset(ic->ic_des_essid, 0, IEEE80211_NWID_LEN); 686 ic->ic_des_esslen = 0; 687 ieee80211_disable_wep(ic); 688 ieee80211_disable_rsn(ic); 689 } 690 691 void 692 ieee80211_node_attach(struct ifnet *ifp) 693 { 694 struct ieee80211com *ic = (void *)ifp; 695 #ifndef IEEE80211_STA_ONLY 696 int size; 697 #endif 698 699 RBT_INIT(ieee80211_tree, &ic->ic_tree); 700 ic->ic_node_alloc = ieee80211_node_alloc; 701 ic->ic_node_free = ieee80211_node_free; 702 ic->ic_node_copy = ieee80211_node_copy; 703 ic->ic_node_getrssi = ieee80211_node_getrssi; 704 ic->ic_node_checkrssi = ieee80211_node_checkrssi; 705 ic->ic_scangen = 1; 706 ic->ic_max_nnodes = ieee80211_cache_size; 707 708 if (ic->ic_max_aid == 0) 709 ic->ic_max_aid = IEEE80211_AID_DEF; 710 else if (ic->ic_max_aid > IEEE80211_AID_MAX) 711 ic->ic_max_aid = IEEE80211_AID_MAX; 712 #ifndef IEEE80211_STA_ONLY 713 size = howmany(ic->ic_max_aid, 32) * sizeof(u_int32_t); 714 ic->ic_aid_bitmap = malloc(size, M_DEVBUF, M_NOWAIT | M_ZERO); 715 if (ic->ic_aid_bitmap == NULL) { 716 /* XXX no way to recover */ 717 printf("%s: no memory for AID bitmap!\n", __func__); 718 ic->ic_max_aid = 0; 719 } 720 if (ic->ic_caps & (IEEE80211_C_HOSTAP | IEEE80211_C_IBSS)) { 721 ic->ic_tim_len = howmany(ic->ic_max_aid, 8); 722 ic->ic_tim_bitmap = malloc(ic->ic_tim_len, M_DEVBUF, 723 M_NOWAIT | M_ZERO); 724 if (ic->ic_tim_bitmap == NULL) { 725 printf("%s: no memory for TIM bitmap!\n", __func__); 726 ic->ic_tim_len = 0; 727 } else 728 ic->ic_set_tim = ieee80211_set_tim; 729 timeout_set(&ic->ic_rsn_timeout, 730 ieee80211_gtk_rekey_timeout, ic); 731 timeout_set(&ic->ic_inact_timeout, 732 ieee80211_inact_timeout, ic); 733 timeout_set(&ic->ic_node_cache_timeout, 734 ieee80211_node_cache_timeout, ic); 735 } 736 #endif 737 TAILQ_INIT(&ic->ic_ess); 738 } 739 740 struct ieee80211_node * 741 ieee80211_alloc_node_helper(struct ieee80211com *ic) 742 { 743 struct ieee80211_node *ni; 744 if (ic->ic_nnodes >= ic->ic_max_nnodes) 745 ieee80211_clean_nodes(ic, 0); 746 if (ic->ic_nnodes >= ic->ic_max_nnodes) 747 return NULL; 748 ni = (*ic->ic_node_alloc)(ic); 749 return ni; 750 } 751 752 void 753 ieee80211_node_lateattach(struct ifnet *ifp) 754 { 755 struct ieee80211com *ic = (void *)ifp; 756 struct ieee80211_node *ni; 757 758 ni = ieee80211_alloc_node_helper(ic); 759 if (ni == NULL) 760 panic("unable to setup initial BSS node"); 761 ni->ni_chan = IEEE80211_CHAN_ANYC; 762 ic->ic_bss = ieee80211_ref_node(ni); 763 ic->ic_txpower = IEEE80211_TXPOWER_MAX; 764 #ifndef IEEE80211_STA_ONLY 765 mq_init(&ni->ni_savedq, IEEE80211_PS_MAX_QUEUE, IPL_NET); 766 #endif 767 } 768 769 void 770 ieee80211_node_detach(struct ifnet *ifp) 771 { 772 struct ieee80211com *ic = (void *)ifp; 773 774 if (ic->ic_bss != NULL) { 775 (*ic->ic_node_free)(ic, ic->ic_bss); 776 ic->ic_bss = NULL; 777 } 778 ieee80211_del_ess(ic, NULL, 0, 1); 779 ieee80211_free_allnodes(ic, 1); 780 #ifndef IEEE80211_STA_ONLY 781 free(ic->ic_aid_bitmap, M_DEVBUF, 782 howmany(ic->ic_max_aid, 32) * sizeof(u_int32_t)); 783 free(ic->ic_tim_bitmap, M_DEVBUF, ic->ic_tim_len); 784 timeout_del(&ic->ic_inact_timeout); 785 timeout_del(&ic->ic_node_cache_timeout); 786 timeout_del(&ic->ic_tkip_micfail_timeout); 787 #endif 788 timeout_del(&ic->ic_rsn_timeout); 789 } 790 791 /* 792 * AP scanning support. 793 */ 794 795 /* 796 * Initialize the active channel set based on the set 797 * of available channels and the current PHY mode. 798 */ 799 void 800 ieee80211_reset_scan(struct ifnet *ifp) 801 { 802 struct ieee80211com *ic = (void *)ifp; 803 804 memcpy(ic->ic_chan_scan, ic->ic_chan_active, 805 sizeof(ic->ic_chan_active)); 806 /* NB: hack, setup so next_scan starts with the first channel */ 807 if (ic->ic_bss != NULL && ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC) 808 ic->ic_bss->ni_chan = &ic->ic_channels[IEEE80211_CHAN_MAX]; 809 } 810 811 /* 812 * Increase a node's inactivity counter. 813 * This counter get reset to zero if a frame is received. 814 * This function is intended for station mode only. 815 * See ieee80211_node_cache_timeout() for hostap mode. 816 */ 817 void 818 ieee80211_node_raise_inact(void *arg, struct ieee80211_node *ni) 819 { 820 if (ni->ni_refcnt == 0 && ni->ni_inact < IEEE80211_INACT_SCAN) 821 ni->ni_inact++; 822 } 823 824 /* 825 * Begin an active scan. 826 */ 827 void 828 ieee80211_begin_scan(struct ifnet *ifp) 829 { 830 struct ieee80211com *ic = (void *)ifp; 831 832 /* 833 * In all but hostap mode scanning starts off in 834 * an active mode before switching to passive. 835 */ 836 #ifndef IEEE80211_STA_ONLY 837 if (ic->ic_opmode != IEEE80211_M_HOSTAP) 838 #endif 839 { 840 ic->ic_flags |= IEEE80211_F_ASCAN; 841 ic->ic_stats.is_scan_active++; 842 } 843 #ifndef IEEE80211_STA_ONLY 844 else 845 ic->ic_stats.is_scan_passive++; 846 #endif 847 if (ifp->if_flags & IFF_DEBUG) 848 printf("%s: begin %s scan\n", ifp->if_xname, 849 (ic->ic_flags & IEEE80211_F_ASCAN) ? 850 "active" : "passive"); 851 852 853 if (ic->ic_opmode == IEEE80211_M_STA) { 854 ieee80211_node_cleanup(ic, ic->ic_bss); 855 ieee80211_iterate_nodes(ic, ieee80211_node_raise_inact, NULL); 856 } 857 858 /* 859 * Reset the current mode. Setting the current mode will also 860 * reset scan state. 861 */ 862 if (IFM_MODE(ic->ic_media.ifm_cur->ifm_media) == IFM_AUTO) 863 ic->ic_curmode = IEEE80211_MODE_AUTO; 864 ieee80211_setmode(ic, ic->ic_curmode); 865 866 ic->ic_scan_count = 0; 867 868 /* Scan the next channel. */ 869 ieee80211_next_scan(ifp); 870 } 871 872 /* 873 * Switch to the next channel marked for scanning. 874 */ 875 void 876 ieee80211_next_scan(struct ifnet *ifp) 877 { 878 struct ieee80211com *ic = (void *)ifp; 879 struct ieee80211_channel *chan; 880 881 chan = ic->ic_bss->ni_chan; 882 for (;;) { 883 if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) 884 chan = &ic->ic_channels[0]; 885 if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { 886 /* 887 * Ignore channels marked passive-only 888 * during an active scan. 889 */ 890 if ((ic->ic_flags & IEEE80211_F_ASCAN) == 0 || 891 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) 892 break; 893 } 894 if (chan == ic->ic_bss->ni_chan) { 895 ieee80211_end_scan(ifp); 896 return; 897 } 898 } 899 clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); 900 DPRINTF(("chan %d->%d\n", 901 ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan), 902 ieee80211_chan2ieee(ic, chan))); 903 ic->ic_bss->ni_chan = chan; 904 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 905 } 906 907 #ifndef IEEE80211_STA_ONLY 908 void 909 ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) 910 { 911 enum ieee80211_phymode mode; 912 struct ieee80211_node *ni; 913 struct ifnet *ifp = &ic->ic_if; 914 915 ni = ic->ic_bss; 916 if (ifp->if_flags & IFF_DEBUG) 917 printf("%s: creating ibss\n", ifp->if_xname); 918 ic->ic_flags |= IEEE80211_F_SIBSS; 919 ni->ni_chan = chan; 920 if ((ic->ic_flags & IEEE80211_F_VHTON) && IEEE80211_IS_CHAN_5GHZ(chan)) 921 mode = IEEE80211_MODE_11AC; 922 else if (ic->ic_flags & IEEE80211_F_HTON) 923 mode = IEEE80211_MODE_11N; 924 else 925 mode = ieee80211_chan2mode(ic, ni->ni_chan); 926 ieee80211_setmode(ic, mode); 927 /* Pick an appropriate mode for supported legacy rates. */ 928 if (ic->ic_curmode == IEEE80211_MODE_11AC) { 929 mode = IEEE80211_MODE_11A; 930 } else if (ic->ic_curmode == IEEE80211_MODE_11N) { 931 if (IEEE80211_IS_CHAN_5GHZ(chan)) 932 mode = IEEE80211_MODE_11A; 933 else 934 mode = IEEE80211_MODE_11G; 935 } else { 936 mode = ic->ic_curmode; 937 } 938 ni->ni_rates = ic->ic_sup_rates[mode]; 939 ni->ni_txrate = 0; 940 IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr); 941 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); 942 if (ic->ic_opmode == IEEE80211_M_IBSS) { 943 if ((ic->ic_flags & IEEE80211_F_DESBSSID) != 0) 944 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid); 945 else 946 ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ 947 } 948 ni->ni_esslen = ic->ic_des_esslen; 949 memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); 950 ni->ni_rssi = 0; 951 ni->ni_rstamp = 0; 952 memset(ni->ni_tstamp, 0, sizeof(ni->ni_tstamp)); 953 ni->ni_intval = ic->ic_lintval; 954 ni->ni_capinfo = IEEE80211_CAPINFO_IBSS; 955 if (ic->ic_flags & IEEE80211_F_WEPON) 956 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; 957 if (ic->ic_flags & IEEE80211_F_HTON) { 958 const struct ieee80211_edca_ac_params *ac_qap; 959 struct ieee80211_edca_ac_params *ac; 960 int aci; 961 962 /* 963 * Configure HT protection. This will be updated later 964 * based on the number of non-HT nodes in the node cache. 965 */ 966 ic->ic_protmode = IEEE80211_PROT_NONE; 967 ni->ni_htop1 = IEEE80211_HTPROT_NONE; 968 /* Disallow Greenfield mode. None of our drivers support it. */ 969 ni->ni_htop1 |= IEEE80211_HTOP1_NONGF_STA; 970 if (ic->ic_updateprot) 971 ic->ic_updateprot(ic); 972 973 /* Configure QoS EDCA parameters. */ 974 for (aci = 0; aci < EDCA_NUM_AC; aci++) { 975 ac = &ic->ic_edca_ac[aci]; 976 ac_qap = &ieee80211_qap_edca_table[ic->ic_curmode][aci]; 977 ac->ac_acm = ac_qap->ac_acm; 978 ac->ac_aifsn = ac_qap->ac_aifsn; 979 ac->ac_ecwmin = ac_qap->ac_ecwmin; 980 ac->ac_ecwmax = ac_qap->ac_ecwmax; 981 ac->ac_txoplimit = ac_qap->ac_txoplimit; 982 } 983 if (ic->ic_updateedca) 984 (*ic->ic_updateedca)(ic); 985 } 986 if (ic->ic_flags & IEEE80211_F_RSNON) { 987 struct ieee80211_key *k; 988 989 /* initialize 256-bit global key counter to a random value */ 990 arc4random_buf(ic->ic_globalcnt, EAPOL_KEY_NONCE_LEN); 991 992 ni->ni_rsnprotos = ic->ic_rsnprotos; 993 ni->ni_rsnakms = ic->ic_rsnakms; 994 ni->ni_rsnciphers = ic->ic_rsnciphers; 995 ni->ni_rsngroupcipher = ic->ic_rsngroupcipher; 996 ni->ni_rsngroupmgmtcipher = ic->ic_rsngroupmgmtcipher; 997 ni->ni_rsncaps = 0; 998 if (ic->ic_caps & IEEE80211_C_MFP) { 999 ni->ni_rsncaps |= IEEE80211_RSNCAP_MFPC; 1000 if (ic->ic_flags & IEEE80211_F_MFPR) 1001 ni->ni_rsncaps |= IEEE80211_RSNCAP_MFPR; 1002 } 1003 1004 ic->ic_def_txkey = 1; 1005 ic->ic_flags &= ~IEEE80211_F_COUNTERM; 1006 k = &ic->ic_nw_keys[ic->ic_def_txkey]; 1007 memset(k, 0, sizeof(*k)); 1008 k->k_id = ic->ic_def_txkey; 1009 k->k_cipher = ni->ni_rsngroupcipher; 1010 k->k_flags = IEEE80211_KEY_GROUP | IEEE80211_KEY_TX; 1011 k->k_len = ieee80211_cipher_keylen(k->k_cipher); 1012 arc4random_buf(k->k_key, k->k_len); 1013 (*ic->ic_set_key)(ic, ni, k); /* XXX */ 1014 1015 if (ic->ic_caps & IEEE80211_C_MFP) { 1016 ic->ic_igtk_kid = 4; 1017 k = &ic->ic_nw_keys[ic->ic_igtk_kid]; 1018 memset(k, 0, sizeof(*k)); 1019 k->k_id = ic->ic_igtk_kid; 1020 k->k_cipher = ni->ni_rsngroupmgmtcipher; 1021 k->k_flags = IEEE80211_KEY_IGTK | IEEE80211_KEY_TX; 1022 k->k_len = 16; 1023 arc4random_buf(k->k_key, k->k_len); 1024 (*ic->ic_set_key)(ic, ni, k); /* XXX */ 1025 } 1026 /* 1027 * In HostAP mode, multicast traffic is sent using ic_bss 1028 * as the Tx node, so mark our node as valid so we can send 1029 * multicast frames using the group key we've just configured. 1030 */ 1031 ni->ni_port_valid = 1; 1032 ni->ni_flags |= IEEE80211_NODE_TXPROT; 1033 1034 /* schedule a GTK/IGTK rekeying after 3600s */ 1035 timeout_add_sec(&ic->ic_rsn_timeout, 3600); 1036 } 1037 timeout_add_sec(&ic->ic_inact_timeout, IEEE80211_INACT_WAIT); 1038 timeout_add_sec(&ic->ic_node_cache_timeout, IEEE80211_CACHE_WAIT); 1039 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 1040 } 1041 #endif /* IEEE80211_STA_ONLY */ 1042 1043 int 1044 ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni, 1045 int bgscan) 1046 { 1047 u_int8_t rate; 1048 int fail; 1049 1050 fail = 0; 1051 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) 1052 fail |= IEEE80211_NODE_ASSOCFAIL_CHAN; 1053 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 1054 ni->ni_chan != ic->ic_des_chan) 1055 fail |= IEEE80211_NODE_ASSOCFAIL_CHAN; 1056 #ifndef IEEE80211_STA_ONLY 1057 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1058 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 1059 fail |= IEEE80211_NODE_ASSOCFAIL_IBSS; 1060 } else 1061 #endif 1062 { 1063 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) 1064 fail |= IEEE80211_NODE_ASSOCFAIL_IBSS; 1065 } 1066 if (ic->ic_flags & (IEEE80211_F_WEPON | IEEE80211_F_RSNON)) { 1067 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 1068 fail |= IEEE80211_NODE_ASSOCFAIL_PRIVACY; 1069 } else { 1070 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) 1071 fail |= IEEE80211_NODE_ASSOCFAIL_PRIVACY; 1072 } 1073 1074 rate = ieee80211_fix_rate(ic, ni, IEEE80211_F_DONEGO); 1075 if (rate & IEEE80211_RATE_BASIC) 1076 fail |= IEEE80211_NODE_ASSOCFAIL_BASIC_RATE; 1077 if (ic->ic_des_esslen == 0) 1078 fail |= IEEE80211_NODE_ASSOCFAIL_ESSID; 1079 if (ic->ic_des_esslen != 0 && 1080 (ni->ni_esslen != ic->ic_des_esslen || 1081 memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0)) 1082 fail |= IEEE80211_NODE_ASSOCFAIL_ESSID; 1083 if ((ic->ic_flags & IEEE80211_F_DESBSSID) && 1084 !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) 1085 fail |= IEEE80211_NODE_ASSOCFAIL_BSSID; 1086 1087 if (ic->ic_flags & IEEE80211_F_RSNON) { 1088 /* 1089 * If at least one RSN IE field from the AP's RSN IE fails 1090 * to overlap with any value the STA supports, the STA shall 1091 * decline to associate with that AP. 1092 */ 1093 if ((ni->ni_rsnprotos & ic->ic_rsnprotos) == 0) 1094 fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; 1095 if ((ni->ni_rsnakms & ic->ic_rsnakms) == 0) 1096 fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; 1097 if ((ni->ni_rsnakms & ic->ic_rsnakms & 1098 ~(IEEE80211_AKM_PSK | IEEE80211_AKM_SHA256_PSK)) == 0) { 1099 /* AP only supports PSK AKMPs */ 1100 if (!(ic->ic_flags & IEEE80211_F_PSK)) 1101 fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; 1102 } 1103 if (ni->ni_rsngroupcipher != IEEE80211_CIPHER_WEP40 && 1104 ni->ni_rsngroupcipher != IEEE80211_CIPHER_TKIP && 1105 ni->ni_rsngroupcipher != IEEE80211_CIPHER_CCMP && 1106 ni->ni_rsngroupcipher != IEEE80211_CIPHER_WEP104) 1107 fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; 1108 if ((ni->ni_rsnciphers & ic->ic_rsnciphers) == 0) 1109 fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; 1110 1111 /* we only support BIP as the IGTK cipher */ 1112 if ((ni->ni_rsncaps & IEEE80211_RSNCAP_MFPC) && 1113 ni->ni_rsngroupmgmtcipher != IEEE80211_CIPHER_BIP) 1114 fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; 1115 1116 /* we do not support MFP but AP requires it */ 1117 if (!(ic->ic_caps & IEEE80211_C_MFP) && 1118 (ni->ni_rsncaps & IEEE80211_RSNCAP_MFPR)) 1119 fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; 1120 1121 /* we require MFP but AP does not support it */ 1122 if ((ic->ic_caps & IEEE80211_C_MFP) && 1123 (ic->ic_flags & IEEE80211_F_MFPR) && 1124 !(ni->ni_rsncaps & IEEE80211_RSNCAP_MFPC)) 1125 fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; 1126 } 1127 1128 if (ic->ic_if.if_flags & IFF_DEBUG) { 1129 printf("%s: %c %s%c", ic->ic_if.if_xname, fail ? '-' : '+', 1130 ether_sprintf(ni->ni_bssid), 1131 fail & IEEE80211_NODE_ASSOCFAIL_BSSID ? '!' : ' '); 1132 printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), 1133 fail & IEEE80211_NODE_ASSOCFAIL_CHAN ? '!' : ' '); 1134 printf(" %+4d", ni->ni_rssi); 1135 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1136 fail & IEEE80211_NODE_ASSOCFAIL_BASIC_RATE ? '!' : ' '); 1137 printf(" %4s%c", 1138 (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1139 (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 1140 "????", 1141 fail & IEEE80211_NODE_ASSOCFAIL_IBSS ? '!' : ' '); 1142 printf(" %7s%c ", 1143 (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1144 "privacy" : "no", 1145 fail & IEEE80211_NODE_ASSOCFAIL_PRIVACY ? '!' : ' '); 1146 printf(" %3s%c ", 1147 (ic->ic_flags & IEEE80211_F_RSNON) ? 1148 "rsn" : "no", 1149 fail & IEEE80211_NODE_ASSOCFAIL_WPA_PROTO ? '!' : ' '); 1150 ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); 1151 printf("%s\n", 1152 fail & IEEE80211_NODE_ASSOCFAIL_ESSID ? "!" : ""); 1153 } 1154 1155 /* We don't care about unrelated networks during background scans. */ 1156 if (bgscan) { 1157 if ((fail & IEEE80211_NODE_ASSOCFAIL_ESSID) == 0) 1158 ni->ni_assoc_fail = fail; 1159 } else 1160 ni->ni_assoc_fail = fail; 1161 if ((fail & IEEE80211_NODE_ASSOCFAIL_ESSID) == 0) 1162 ic->ic_bss->ni_assoc_fail = ni->ni_assoc_fail; 1163 1164 return fail; 1165 } 1166 1167 struct ieee80211_node_switch_bss_arg { 1168 u_int8_t cur_macaddr[IEEE80211_ADDR_LEN]; 1169 u_int8_t sel_macaddr[IEEE80211_ADDR_LEN]; 1170 }; 1171 1172 void 1173 ieee80211_node_free_unref_cb(struct ieee80211_node *ni) 1174 { 1175 free(ni->ni_unref_arg, M_DEVBUF, ni->ni_unref_arg_size); 1176 1177 /* Guard against accidental reuse. */ 1178 ni->ni_unref_cb = NULL; 1179 ni->ni_unref_arg = NULL; 1180 ni->ni_unref_arg_size = 0; 1181 } 1182 1183 /* Implements ni->ni_unref_cb(). */ 1184 void 1185 ieee80211_node_tx_stopped(struct ieee80211com *ic, 1186 struct ieee80211_node *ni) 1187 { 1188 splassert(IPL_NET); 1189 1190 if ((ic->ic_flags & IEEE80211_F_BGSCAN) == 0) 1191 return; 1192 1193 /* 1194 * Install a callback which will switch us to the new AP once 1195 * the de-auth frame has been processed by hardware. 1196 * Pass on the existing ni->ni_unref_arg argument. 1197 */ 1198 ic->ic_bss->ni_unref_cb = ieee80211_node_switch_bss; 1199 1200 /* 1201 * All data frames queued to hardware have been flushed and 1202 * A-MPDU Tx has been stopped. We are now going to switch APs. 1203 * Queue a de-auth frame addressed at our current AP. 1204 */ 1205 if (IEEE80211_SEND_MGMT(ic, ic->ic_bss, 1206 IEEE80211_FC0_SUBTYPE_DEAUTH, 1207 IEEE80211_REASON_AUTH_LEAVE) != 0) { 1208 ic->ic_flags &= ~IEEE80211_F_BGSCAN; 1209 ieee80211_node_free_unref_cb(ni); 1210 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 1211 return; 1212 } 1213 1214 /* F_BGSCAN flag gets cleared in ieee80211_node_join_bss(). */ 1215 } 1216 1217 /* Implements ni->ni_unref_cb(). */ 1218 void 1219 ieee80211_node_tx_flushed(struct ieee80211com *ic, struct ieee80211_node *ni) 1220 { 1221 splassert(IPL_NET); 1222 1223 if ((ic->ic_flags & IEEE80211_F_BGSCAN) == 0) 1224 return; 1225 1226 /* All data frames queued to hardware have been flushed. */ 1227 if (ic->ic_caps & IEEE80211_C_TX_AMPDU) { 1228 /* 1229 * Install a callback which will switch us to the 1230 * new AP once Tx agg sessions have been stopped, 1231 * which involves sending a DELBA frame. 1232 * Pass on the existing ni->ni_unref_arg argument. 1233 */ 1234 ic->ic_bss->ni_unref_cb = ieee80211_node_tx_stopped; 1235 ieee80211_stop_ampdu_tx(ic, ic->ic_bss, 1236 IEEE80211_FC0_SUBTYPE_DEAUTH); 1237 } else 1238 ieee80211_node_tx_stopped(ic, ni); 1239 } 1240 1241 /* Implements ni->ni_unref_cb(). */ 1242 void 1243 ieee80211_node_switch_bss(struct ieee80211com *ic, struct ieee80211_node *ni) 1244 { 1245 struct ifnet *ifp = &ic->ic_if; 1246 struct ieee80211_node_switch_bss_arg *sba = ni->ni_unref_arg; 1247 struct ieee80211_node *curbs, *selbs; 1248 1249 splassert(IPL_NET); 1250 1251 if ((ic->ic_flags & IEEE80211_F_BGSCAN) == 0) 1252 return; 1253 1254 ic->ic_xflags &= ~IEEE80211_F_TX_MGMT_ONLY; 1255 1256 selbs = ieee80211_find_node(ic, sba->sel_macaddr); 1257 if (selbs == NULL) { 1258 ieee80211_node_free_unref_cb(ni); 1259 ic->ic_flags &= ~IEEE80211_F_BGSCAN; 1260 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 1261 return; 1262 } 1263 1264 curbs = ieee80211_find_node(ic, sba->cur_macaddr); 1265 if (curbs == NULL) { 1266 ieee80211_node_free_unref_cb(ni); 1267 ic->ic_flags &= ~IEEE80211_F_BGSCAN; 1268 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 1269 return; 1270 } 1271 1272 if (ifp->if_flags & IFF_DEBUG) { 1273 printf("%s: roaming from %s chan %d ", 1274 ifp->if_xname, ether_sprintf(curbs->ni_macaddr), 1275 ieee80211_chan2ieee(ic, curbs->ni_chan)); 1276 printf("to %s chan %d\n", ether_sprintf(selbs->ni_macaddr), 1277 ieee80211_chan2ieee(ic, selbs->ni_chan)); 1278 } 1279 ieee80211_node_newstate(curbs, IEEE80211_STA_CACHE); 1280 /* 1281 * ieee80211_node_join_bss() frees arg and ic->ic_bss via 1282 * ic->ic_node_copy() in ieee80211_node_cleanup(). 1283 */ 1284 ieee80211_node_join_bss(ic, selbs); 1285 } 1286 1287 void 1288 ieee80211_node_join_bss(struct ieee80211com *ic, struct ieee80211_node *selbs) 1289 { 1290 enum ieee80211_phymode mode; 1291 struct ieee80211_node *ni; 1292 uint32_t assoc_fail = 0; 1293 1294 /* Reinitialize media mode and channels if needed. */ 1295 mode = ieee80211_chan2mode(ic, selbs->ni_chan); 1296 if (mode != ic->ic_curmode) 1297 ieee80211_setmode(ic, mode); 1298 1299 /* Keep recorded association failures for this BSS/ESS intact. */ 1300 if (IEEE80211_ADDR_EQ(ic->ic_bss->ni_macaddr, selbs->ni_macaddr) || 1301 (ic->ic_des_esslen > 0 && ic->ic_des_esslen == selbs->ni_esslen && 1302 memcmp(ic->ic_des_essid, selbs->ni_essid, selbs->ni_esslen) == 0)) 1303 assoc_fail = ic->ic_bss->ni_assoc_fail; 1304 1305 (*ic->ic_node_copy)(ic, ic->ic_bss, selbs); 1306 ni = ic->ic_bss; 1307 ni->ni_assoc_fail |= assoc_fail; 1308 1309 ic->ic_curmode = ieee80211_chan2mode(ic, ni->ni_chan); 1310 1311 /* Make sure we send valid rates in an association request. */ 1312 if (ic->ic_opmode == IEEE80211_M_STA) 1313 ieee80211_fix_rate(ic, ni, 1314 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1315 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1316 1317 if (ic->ic_flags & IEEE80211_F_RSNON) 1318 ieee80211_choose_rsnparams(ic); 1319 else if (ic->ic_flags & IEEE80211_F_WEPON) 1320 ni->ni_rsncipher = IEEE80211_CIPHER_USEGROUP; 1321 1322 ieee80211_node_newstate(selbs, IEEE80211_STA_BSS); 1323 #ifndef IEEE80211_STA_ONLY 1324 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1325 ieee80211_fix_rate(ic, ni, IEEE80211_F_DOFRATE | 1326 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1327 if (ni->ni_rates.rs_nrates == 0) { 1328 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 1329 return; 1330 } 1331 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 1332 } else 1333 #endif 1334 { 1335 int bgscan = ((ic->ic_flags & IEEE80211_F_BGSCAN) && 1336 ic->ic_opmode == IEEE80211_M_STA && 1337 ic->ic_state == IEEE80211_S_RUN); 1338 int auth_next = (ic->ic_opmode == IEEE80211_M_STA && 1339 ic->ic_state == IEEE80211_S_AUTH); 1340 int mgt = -1; 1341 1342 timeout_del(&ic->ic_bgscan_timeout); 1343 ic->ic_flags &= ~IEEE80211_F_BGSCAN; 1344 1345 /* 1346 * After a background scan, we have now switched APs. 1347 * Pretend we were just de-authed, which makes 1348 * ieee80211_new_state() try to re-auth and thus send 1349 * an AUTH frame to our newly selected AP. 1350 */ 1351 if (bgscan) 1352 mgt = IEEE80211_FC0_SUBTYPE_DEAUTH; 1353 /* 1354 * If we are trying another AP after the previous one 1355 * failed (state transition AUTH->AUTH), ensure that 1356 * ieee80211_new_state() tries to send another auth frame. 1357 */ 1358 else if (auth_next) 1359 mgt = IEEE80211_FC0_SUBTYPE_AUTH; 1360 1361 ieee80211_new_state(ic, IEEE80211_S_AUTH, mgt); 1362 } 1363 } 1364 1365 struct ieee80211_node * 1366 ieee80211_node_choose_bss(struct ieee80211com *ic, int bgscan, 1367 struct ieee80211_node **curbs) 1368 { 1369 struct ieee80211_node *ni, *nextbs, *selbs = NULL, 1370 *selbs2 = NULL, *selbs5 = NULL; 1371 uint8_t min_5ghz_rssi; 1372 1373 ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); 1374 1375 for (; ni != NULL; ni = nextbs) { 1376 nextbs = RBT_NEXT(ieee80211_tree, ni); 1377 if (ni->ni_fails) { 1378 /* 1379 * The configuration of the access points may change 1380 * during my scan. So delete the entry for the AP 1381 * and retry to associate if there is another beacon. 1382 */ 1383 if (ni->ni_fails++ > 2) 1384 ieee80211_free_node(ic, ni); 1385 continue; 1386 } 1387 1388 if (curbs && ieee80211_node_cmp(ic->ic_bss, ni) == 0) 1389 *curbs = ni; 1390 1391 if (ieee80211_match_bss(ic, ni, bgscan) != 0) 1392 continue; 1393 1394 if (ic->ic_caps & IEEE80211_C_SCANALLBAND) { 1395 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan) && 1396 (selbs2 == NULL || ni->ni_rssi > selbs2->ni_rssi)) 1397 selbs2 = ni; 1398 else if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan) && 1399 (selbs5 == NULL || ni->ni_rssi > selbs5->ni_rssi)) 1400 selbs5 = ni; 1401 } else if (selbs == NULL || ni->ni_rssi > selbs->ni_rssi) 1402 selbs = ni; 1403 } 1404 1405 if (ic->ic_max_rssi) 1406 min_5ghz_rssi = IEEE80211_RSSI_THRES_RATIO_5GHZ; 1407 else 1408 min_5ghz_rssi = (uint8_t)IEEE80211_RSSI_THRES_5GHZ; 1409 1410 /* 1411 * Prefer a 5Ghz AP even if its RSSI is weaker than the best 2Ghz AP 1412 * (as long as it meets the minimum RSSI threshold) since the 5Ghz band 1413 * is usually less saturated. 1414 */ 1415 if (selbs5 && selbs5->ni_rssi > min_5ghz_rssi) 1416 selbs = selbs5; 1417 else if (selbs5 && selbs2) 1418 selbs = (selbs5->ni_rssi >= selbs2->ni_rssi ? selbs5 : selbs2); 1419 else if (selbs2) 1420 selbs = selbs2; 1421 else if (selbs5) 1422 selbs = selbs5; 1423 1424 return selbs; 1425 } 1426 1427 /* 1428 * Complete a scan of potential channels. 1429 */ 1430 void 1431 ieee80211_end_scan(struct ifnet *ifp) 1432 { 1433 struct ieee80211com *ic = (void *)ifp; 1434 struct ieee80211_node *ni, *selbs = NULL, *curbs = NULL; 1435 int bgscan = ((ic->ic_flags & IEEE80211_F_BGSCAN) && 1436 ic->ic_opmode == IEEE80211_M_STA && 1437 ic->ic_state == IEEE80211_S_RUN); 1438 1439 if (ifp->if_flags & IFF_DEBUG) 1440 printf("%s: end %s scan\n", ifp->if_xname, 1441 bgscan ? "background" : 1442 ((ic->ic_flags & IEEE80211_F_ASCAN) ? 1443 "active" : "passive")); 1444 1445 if (ic->ic_scan_count) 1446 ic->ic_flags &= ~IEEE80211_F_ASCAN; 1447 1448 if (ic->ic_opmode == IEEE80211_M_STA) 1449 ieee80211_clean_inactive_nodes(ic, IEEE80211_INACT_SCAN); 1450 1451 ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); 1452 1453 #ifndef IEEE80211_STA_ONLY 1454 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 1455 /* XXX off stack? */ 1456 u_char occupied[howmany(IEEE80211_CHAN_MAX, NBBY)]; 1457 int i, fail; 1458 1459 /* 1460 * The passive scan to look for existing AP's completed, 1461 * select a channel to camp on. Identify the channels 1462 * that already have one or more AP's and try to locate 1463 * an unoccupied one. If that fails, pick a random 1464 * channel from the active set. 1465 */ 1466 memset(occupied, 0, sizeof(occupied)); 1467 RBT_FOREACH(ni, ieee80211_tree, &ic->ic_tree) 1468 setbit(occupied, ieee80211_chan2ieee(ic, ni->ni_chan)); 1469 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 1470 if (isset(ic->ic_chan_active, i) && isclr(occupied, i)) 1471 break; 1472 if (i == IEEE80211_CHAN_MAX) { 1473 fail = arc4random() & 3; /* random 0-3 */ 1474 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 1475 if (isset(ic->ic_chan_active, i) && fail-- == 0) 1476 break; 1477 } 1478 ieee80211_create_ibss(ic, &ic->ic_channels[i]); 1479 return; 1480 } 1481 #endif 1482 if (ni == NULL) { 1483 DPRINTF(("no scan candidate\n")); 1484 notfound: 1485 1486 #ifndef IEEE80211_STA_ONLY 1487 if (ic->ic_opmode == IEEE80211_M_IBSS && 1488 (ic->ic_flags & IEEE80211_F_IBSSON) && 1489 ic->ic_des_esslen != 0) { 1490 ieee80211_create_ibss(ic, ic->ic_ibss_chan); 1491 return; 1492 } 1493 #endif 1494 /* 1495 * Reset the list of channels to scan and scan the next mode 1496 * if nothing has been found. 1497 * If the device scans all bands in one fell swoop, return 1498 * current scan results to userspace regardless of mode. 1499 * This will loop forever until an access point is found. 1500 */ 1501 ieee80211_reset_scan(ifp); 1502 if (ieee80211_next_mode(ifp) == IEEE80211_MODE_AUTO || 1503 (ic->ic_caps & IEEE80211_C_SCANALLBAND)) 1504 ic->ic_scan_count++; 1505 1506 ieee80211_next_scan(ifp); 1507 return; 1508 } 1509 1510 /* Possibly switch which ssid we are associated with */ 1511 if (!bgscan && ic->ic_opmode == IEEE80211_M_STA) 1512 ieee80211_switch_ess(ic); 1513 1514 selbs = ieee80211_node_choose_bss(ic, bgscan, &curbs); 1515 if (bgscan) { 1516 struct ieee80211_node_switch_bss_arg *arg; 1517 1518 /* AP disappeared? Should not happen. */ 1519 if (selbs == NULL || curbs == NULL) { 1520 ic->ic_flags &= ~IEEE80211_F_BGSCAN; 1521 goto notfound; 1522 } 1523 1524 /* 1525 * After a background scan we might end up choosing the 1526 * same AP again. Or the newly selected AP's RSSI level 1527 * might be low enough to trigger another background scan. 1528 * Do not change ic->ic_bss in these cases and make 1529 * background scans less frequent. 1530 */ 1531 if (selbs == curbs || !(*ic->ic_node_checkrssi)(ic, selbs)) { 1532 if (ic->ic_bgscan_fail < IEEE80211_BGSCAN_FAIL_MAX) { 1533 if (ic->ic_bgscan_fail <= 0) 1534 ic->ic_bgscan_fail = 1; 1535 else 1536 ic->ic_bgscan_fail *= 2; 1537 } 1538 ic->ic_flags &= ~IEEE80211_F_BGSCAN; 1539 1540 /* 1541 * HT is negotiated during association so we must use 1542 * ic_bss to check HT. The nodes tree was re-populated 1543 * during background scan and therefore selbs and curbs 1544 * may not carry HT information. 1545 */ 1546 ni = ic->ic_bss; 1547 if (ni->ni_flags & IEEE80211_NODE_VHT) 1548 ieee80211_setmode(ic, IEEE80211_MODE_11AC); 1549 else if (ni->ni_flags & IEEE80211_NODE_HT) 1550 ieee80211_setmode(ic, IEEE80211_MODE_11N); 1551 else 1552 ieee80211_setmode(ic, 1553 ieee80211_chan2mode(ic, ni->ni_chan)); 1554 return; 1555 } 1556 1557 arg = malloc(sizeof(*arg), M_DEVBUF, M_NOWAIT | M_ZERO); 1558 if (arg == NULL) { 1559 ic->ic_flags &= ~IEEE80211_F_BGSCAN; 1560 return; 1561 } 1562 1563 ic->ic_bgscan_fail = 0; 1564 1565 /* Prevent dispatch of additional data frames to hardware. */ 1566 ic->ic_xflags |= IEEE80211_F_TX_MGMT_ONLY; 1567 1568 IEEE80211_ADDR_COPY(arg->cur_macaddr, curbs->ni_macaddr); 1569 IEEE80211_ADDR_COPY(arg->sel_macaddr, selbs->ni_macaddr); 1570 1571 if (ic->ic_bgscan_done) { 1572 /* 1573 * The driver will flush its queues and allow roaming 1574 * to proceed once queues have been flushed. 1575 * On failure the driver will move back to SCAN state. 1576 */ 1577 ic->ic_bgscan_done(ic, arg, sizeof(*arg)); 1578 return; 1579 } 1580 1581 /* 1582 * Install a callback which will switch us to the new AP once 1583 * all dispatched frames have been processed by hardware. 1584 */ 1585 ic->ic_bss->ni_unref_arg = arg; 1586 ic->ic_bss->ni_unref_arg_size = sizeof(*arg); 1587 if (ic->ic_bss->ni_refcnt > 0) 1588 ic->ic_bss->ni_unref_cb = ieee80211_node_tx_flushed; 1589 else 1590 ieee80211_node_tx_flushed(ic, ni); 1591 /* F_BGSCAN flag gets cleared in ieee80211_node_join_bss(). */ 1592 return; 1593 } else if (selbs == NULL) 1594 goto notfound; 1595 1596 ieee80211_node_join_bss(ic, selbs); 1597 } 1598 1599 /* 1600 * Autoselect the best RSN parameters (protocol, AKMP, pairwise cipher...) 1601 * that are supported by both peers (STA mode only). 1602 */ 1603 void 1604 ieee80211_choose_rsnparams(struct ieee80211com *ic) 1605 { 1606 struct ieee80211_node *ni = ic->ic_bss; 1607 struct ieee80211_pmk *pmk; 1608 1609 /* filter out unsupported protocol versions */ 1610 ni->ni_rsnprotos &= ic->ic_rsnprotos; 1611 /* prefer RSN (aka WPA2) over WPA */ 1612 if (ni->ni_rsnprotos & IEEE80211_PROTO_RSN) 1613 ni->ni_rsnprotos = IEEE80211_PROTO_RSN; 1614 else 1615 ni->ni_rsnprotos = IEEE80211_PROTO_WPA; 1616 1617 /* filter out unsupported AKMPs */ 1618 ni->ni_rsnakms &= ic->ic_rsnakms; 1619 /* prefer SHA-256 based AKMPs */ 1620 if ((ic->ic_flags & IEEE80211_F_PSK) && (ni->ni_rsnakms & 1621 (IEEE80211_AKM_PSK | IEEE80211_AKM_SHA256_PSK))) { 1622 /* AP supports PSK AKMP and a PSK is configured */ 1623 if (ni->ni_rsnakms & IEEE80211_AKM_SHA256_PSK) 1624 ni->ni_rsnakms = IEEE80211_AKM_SHA256_PSK; 1625 else 1626 ni->ni_rsnakms = IEEE80211_AKM_PSK; 1627 } else { 1628 if (ni->ni_rsnakms & IEEE80211_AKM_SHA256_8021X) 1629 ni->ni_rsnakms = IEEE80211_AKM_SHA256_8021X; 1630 else 1631 ni->ni_rsnakms = IEEE80211_AKM_8021X; 1632 /* check if we have a cached PMK for this AP */ 1633 if (ni->ni_rsnprotos == IEEE80211_PROTO_RSN && 1634 (pmk = ieee80211_pmksa_find(ic, ni, NULL)) != NULL) { 1635 memcpy(ni->ni_pmkid, pmk->pmk_pmkid, 1636 IEEE80211_PMKID_LEN); 1637 ni->ni_flags |= IEEE80211_NODE_PMKID; 1638 } 1639 } 1640 1641 /* filter out unsupported pairwise ciphers */ 1642 ni->ni_rsnciphers &= ic->ic_rsnciphers; 1643 /* prefer CCMP over TKIP */ 1644 if (ni->ni_rsnciphers & IEEE80211_CIPHER_CCMP) 1645 ni->ni_rsnciphers = IEEE80211_CIPHER_CCMP; 1646 else 1647 ni->ni_rsnciphers = IEEE80211_CIPHER_TKIP; 1648 ni->ni_rsncipher = ni->ni_rsnciphers; 1649 1650 /* use MFP if we both support it */ 1651 if ((ic->ic_caps & IEEE80211_C_MFP) && 1652 (ni->ni_rsncaps & IEEE80211_RSNCAP_MFPC)) 1653 ni->ni_flags |= IEEE80211_NODE_MFP; 1654 } 1655 1656 int 1657 ieee80211_get_rate(struct ieee80211com *ic) 1658 { 1659 u_int8_t (*rates)[IEEE80211_RATE_MAXSIZE]; 1660 int rate; 1661 1662 rates = &ic->ic_bss->ni_rates.rs_rates; 1663 1664 if (ic->ic_fixed_rate != -1) 1665 rate = (*rates)[ic->ic_fixed_rate]; 1666 else if (ic->ic_state == IEEE80211_S_RUN) 1667 rate = (*rates)[ic->ic_bss->ni_txrate]; 1668 else 1669 rate = 0; 1670 1671 return rate & IEEE80211_RATE_VAL; 1672 } 1673 1674 struct ieee80211_node * 1675 ieee80211_node_alloc(struct ieee80211com *ic) 1676 { 1677 return malloc(sizeof(struct ieee80211_node), M_DEVBUF, 1678 M_NOWAIT | M_ZERO); 1679 } 1680 1681 void 1682 ieee80211_node_cleanup(struct ieee80211com *ic, struct ieee80211_node *ni) 1683 { 1684 if (ni->ni_rsnie != NULL) { 1685 free(ni->ni_rsnie, M_DEVBUF, 2 + ni->ni_rsnie[1]); 1686 ni->ni_rsnie = NULL; 1687 } 1688 ieee80211_ba_del(ni); 1689 #ifndef IEEE80211_STA_ONLY 1690 mq_purge(&ni->ni_savedq); 1691 #endif 1692 ieee80211_node_free_unref_cb(ni); 1693 } 1694 1695 void 1696 ieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni) 1697 { 1698 ieee80211_node_cleanup(ic, ni); 1699 free(ni, M_DEVBUF, 0); 1700 } 1701 1702 void 1703 ieee80211_node_copy(struct ieee80211com *ic, 1704 struct ieee80211_node *dst, const struct ieee80211_node *src) 1705 { 1706 ieee80211_node_cleanup(ic, dst); 1707 *dst = *src; 1708 dst->ni_rsnie = NULL; 1709 if (src->ni_rsnie != NULL) 1710 ieee80211_save_ie(src->ni_rsnie, &dst->ni_rsnie); 1711 ieee80211_node_set_timeouts(dst); 1712 #ifndef IEEE80211_STA_ONLY 1713 mq_init(&dst->ni_savedq, IEEE80211_PS_MAX_QUEUE, IPL_NET); 1714 #endif 1715 } 1716 1717 u_int8_t 1718 ieee80211_node_getrssi(struct ieee80211com *ic, 1719 const struct ieee80211_node *ni) 1720 { 1721 return ni->ni_rssi; 1722 } 1723 1724 int 1725 ieee80211_node_checkrssi(struct ieee80211com *ic, 1726 const struct ieee80211_node *ni) 1727 { 1728 uint8_t thres; 1729 1730 if (ni->ni_chan == IEEE80211_CHAN_ANYC) 1731 return 0; 1732 1733 if (ic->ic_max_rssi) { 1734 thres = (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) ? 1735 IEEE80211_RSSI_THRES_RATIO_2GHZ : 1736 IEEE80211_RSSI_THRES_RATIO_5GHZ; 1737 return ((ni->ni_rssi * 100) / ic->ic_max_rssi >= thres); 1738 } 1739 1740 thres = (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) ? 1741 IEEE80211_RSSI_THRES_2GHZ : 1742 IEEE80211_RSSI_THRES_5GHZ; 1743 return (ni->ni_rssi >= (u_int8_t)thres); 1744 } 1745 1746 void 1747 ieee80211_node_set_timeouts(struct ieee80211_node *ni) 1748 { 1749 int i; 1750 1751 #ifndef IEEE80211_STA_ONLY 1752 timeout_set(&ni->ni_eapol_to, ieee80211_eapol_timeout, ni); 1753 timeout_set(&ni->ni_sa_query_to, ieee80211_sa_query_timeout, ni); 1754 #endif 1755 timeout_set(&ni->ni_addba_req_to[EDCA_AC_BE], 1756 ieee80211_node_addba_request_ac_be_to, ni); 1757 timeout_set(&ni->ni_addba_req_to[EDCA_AC_BK], 1758 ieee80211_node_addba_request_ac_bk_to, ni); 1759 timeout_set(&ni->ni_addba_req_to[EDCA_AC_VI], 1760 ieee80211_node_addba_request_ac_vi_to, ni); 1761 timeout_set(&ni->ni_addba_req_to[EDCA_AC_VO], 1762 ieee80211_node_addba_request_ac_vo_to, ni); 1763 for (i = 0; i < nitems(ni->ni_addba_req_intval); i++) 1764 ni->ni_addba_req_intval[i] = 1; 1765 } 1766 1767 void 1768 ieee80211_setup_node(struct ieee80211com *ic, 1769 struct ieee80211_node *ni, const u_int8_t *macaddr) 1770 { 1771 int i, s; 1772 1773 DPRINTF(("%s\n", ether_sprintf((u_int8_t *)macaddr))); 1774 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 1775 ieee80211_node_newstate(ni, IEEE80211_STA_CACHE); 1776 1777 ni->ni_ic = ic; /* back-pointer */ 1778 /* Initialize cached last sequence numbers with invalid values. */ 1779 ni->ni_rxseq = 0xffffU; 1780 for (i=0; i < IEEE80211_NUM_TID; ++i) 1781 ni->ni_qos_rxseqs[i] = 0xffffU; 1782 #ifndef IEEE80211_STA_ONLY 1783 mq_init(&ni->ni_savedq, IEEE80211_PS_MAX_QUEUE, IPL_NET); 1784 #endif 1785 ieee80211_node_set_timeouts(ni); 1786 1787 s = splnet(); 1788 RBT_INSERT(ieee80211_tree, &ic->ic_tree, ni); 1789 ic->ic_nnodes++; 1790 splx(s); 1791 } 1792 1793 struct ieee80211_node * 1794 ieee80211_alloc_node(struct ieee80211com *ic, const u_int8_t *macaddr) 1795 { 1796 struct ieee80211_node *ni = ieee80211_alloc_node_helper(ic); 1797 if (ni != NULL) 1798 ieee80211_setup_node(ic, ni, macaddr); 1799 else 1800 ic->ic_stats.is_rx_nodealloc++; 1801 return ni; 1802 } 1803 1804 struct ieee80211_node * 1805 ieee80211_dup_bss(struct ieee80211com *ic, const u_int8_t *macaddr) 1806 { 1807 struct ieee80211_node *ni = ieee80211_alloc_node_helper(ic); 1808 if (ni != NULL) { 1809 ieee80211_setup_node(ic, ni, macaddr); 1810 /* 1811 * Inherit from ic_bss. 1812 */ 1813 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); 1814 ni->ni_chan = ic->ic_bss->ni_chan; 1815 } else 1816 ic->ic_stats.is_rx_nodealloc++; 1817 return ni; 1818 } 1819 1820 struct ieee80211_node * 1821 ieee80211_find_node(struct ieee80211com *ic, const u_int8_t *macaddr) 1822 { 1823 struct ieee80211_node *ni; 1824 int cmp; 1825 1826 /* similar to RBT_FIND except we compare keys, not nodes */ 1827 ni = RBT_ROOT(ieee80211_tree, &ic->ic_tree); 1828 while (ni != NULL) { 1829 cmp = memcmp(macaddr, ni->ni_macaddr, IEEE80211_ADDR_LEN); 1830 if (cmp < 0) 1831 ni = RBT_LEFT(ieee80211_tree, ni); 1832 else if (cmp > 0) 1833 ni = RBT_RIGHT(ieee80211_tree, ni); 1834 else 1835 break; 1836 } 1837 return ni; 1838 } 1839 1840 /* 1841 * Return a reference to the appropriate node for sending 1842 * a data frame. This handles node discovery in adhoc networks. 1843 * 1844 * Drivers will call this, so increase the reference count before 1845 * returning the node. 1846 */ 1847 struct ieee80211_node * 1848 ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr) 1849 { 1850 #ifndef IEEE80211_STA_ONLY 1851 struct ieee80211_node *ni; 1852 int s; 1853 #endif 1854 1855 /* 1856 * The destination address should be in the node table 1857 * unless we are operating in station mode or this is a 1858 * multicast/broadcast frame. 1859 */ 1860 if (ic->ic_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(macaddr)) 1861 return ieee80211_ref_node(ic->ic_bss); 1862 1863 #ifndef IEEE80211_STA_ONLY 1864 s = splnet(); 1865 ni = ieee80211_find_node(ic, macaddr); 1866 splx(s); 1867 if (ni == NULL) { 1868 if (ic->ic_opmode != IEEE80211_M_IBSS && 1869 ic->ic_opmode != IEEE80211_M_AHDEMO) 1870 return NULL; 1871 1872 /* 1873 * Fake up a node; this handles node discovery in 1874 * adhoc mode. Note that for the driver's benefit 1875 * we we treat this like an association so the driver 1876 * has an opportunity to setup its private state. 1877 * 1878 * XXX need better way to handle this; issue probe 1879 * request so we can deduce rate set, etc. 1880 */ 1881 if ((ni = ieee80211_dup_bss(ic, macaddr)) == NULL) 1882 return NULL; 1883 /* XXX no rate negotiation; just dup */ 1884 ni->ni_rates = ic->ic_bss->ni_rates; 1885 ni->ni_txrate = 0; 1886 if (ic->ic_newassoc) 1887 (*ic->ic_newassoc)(ic, ni, 1); 1888 } 1889 return ieee80211_ref_node(ni); 1890 #else 1891 return NULL; /* can't get there */ 1892 #endif /* IEEE80211_STA_ONLY */ 1893 } 1894 1895 /* 1896 * It is usually desirable to process a Rx packet using its sender's 1897 * node-record instead of the BSS record. 1898 * 1899 * - AP mode: keep a node-record for every authenticated/associated 1900 * station *in the BSS*. For future use, we also track neighboring 1901 * APs, since they might belong to the same ESS. APs in the same 1902 * ESS may bridge packets to each other, forming a Wireless 1903 * Distribution System (WDS). 1904 * 1905 * - IBSS mode: keep a node-record for every station *in the BSS*. 1906 * Also track neighboring stations by their beacons/probe responses. 1907 * 1908 * - monitor mode: keep a node-record for every sender, regardless 1909 * of BSS. 1910 * 1911 * - STA mode: the only available node-record is the BSS record, 1912 * ic->ic_bss. 1913 * 1914 * Of all the 802.11 Control packets, only the node-records for 1915 * RTS packets node-record can be looked up. 1916 * 1917 * Return non-zero if the packet's node-record is kept, zero 1918 * otherwise. 1919 */ 1920 static __inline int 1921 ieee80211_needs_rxnode(struct ieee80211com *ic, 1922 const struct ieee80211_frame *wh, const u_int8_t **bssid) 1923 { 1924 int monitor, rc = 0; 1925 1926 monitor = (ic->ic_opmode == IEEE80211_M_MONITOR); 1927 1928 *bssid = NULL; 1929 1930 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) { 1931 case IEEE80211_FC0_TYPE_CTL: 1932 if (!monitor) 1933 break; 1934 return (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == 1935 IEEE80211_FC0_SUBTYPE_RTS; 1936 case IEEE80211_FC0_TYPE_MGT: 1937 *bssid = wh->i_addr3; 1938 switch (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) { 1939 case IEEE80211_FC0_SUBTYPE_BEACON: 1940 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1941 break; 1942 default: 1943 #ifndef IEEE80211_STA_ONLY 1944 if (ic->ic_opmode == IEEE80211_M_STA) 1945 break; 1946 rc = IEEE80211_ADDR_EQ(*bssid, ic->ic_bss->ni_bssid) || 1947 IEEE80211_ADDR_EQ(*bssid, etherbroadcastaddr); 1948 #endif 1949 break; 1950 } 1951 break; 1952 case IEEE80211_FC0_TYPE_DATA: 1953 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 1954 case IEEE80211_FC1_DIR_NODS: 1955 *bssid = wh->i_addr3; 1956 #ifndef IEEE80211_STA_ONLY 1957 if (ic->ic_opmode == IEEE80211_M_IBSS || 1958 ic->ic_opmode == IEEE80211_M_AHDEMO) 1959 rc = IEEE80211_ADDR_EQ(*bssid, 1960 ic->ic_bss->ni_bssid); 1961 #endif 1962 break; 1963 case IEEE80211_FC1_DIR_TODS: 1964 *bssid = wh->i_addr1; 1965 #ifndef IEEE80211_STA_ONLY 1966 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 1967 rc = IEEE80211_ADDR_EQ(*bssid, 1968 ic->ic_bss->ni_bssid); 1969 #endif 1970 break; 1971 case IEEE80211_FC1_DIR_FROMDS: 1972 case IEEE80211_FC1_DIR_DSTODS: 1973 *bssid = wh->i_addr2; 1974 #ifndef IEEE80211_STA_ONLY 1975 rc = (ic->ic_opmode == IEEE80211_M_HOSTAP); 1976 #endif 1977 break; 1978 } 1979 break; 1980 } 1981 return monitor || rc; 1982 } 1983 1984 /* 1985 * Drivers call this, so increase the reference count before returning 1986 * the node. 1987 */ 1988 struct ieee80211_node * 1989 ieee80211_find_rxnode(struct ieee80211com *ic, 1990 const struct ieee80211_frame *wh) 1991 { 1992 static const u_int8_t zero[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; 1993 struct ieee80211_node *ni; 1994 const u_int8_t *bssid; 1995 int s; 1996 1997 if (!ieee80211_needs_rxnode(ic, wh, &bssid)) 1998 return ieee80211_ref_node(ic->ic_bss); 1999 2000 s = splnet(); 2001 ni = ieee80211_find_node(ic, wh->i_addr2); 2002 splx(s); 2003 2004 if (ni != NULL) 2005 return ieee80211_ref_node(ni); 2006 #ifndef IEEE80211_STA_ONLY 2007 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 2008 return ieee80211_ref_node(ic->ic_bss); 2009 #endif 2010 /* XXX see remarks in ieee80211_find_txnode */ 2011 /* XXX no rate negotiation; just dup */ 2012 if ((ni = ieee80211_dup_bss(ic, wh->i_addr2)) == NULL) 2013 return ieee80211_ref_node(ic->ic_bss); 2014 2015 IEEE80211_ADDR_COPY(ni->ni_bssid, (bssid != NULL) ? bssid : zero); 2016 2017 ni->ni_rates = ic->ic_bss->ni_rates; 2018 ni->ni_txrate = 0; 2019 if (ic->ic_newassoc) 2020 (*ic->ic_newassoc)(ic, ni, 1); 2021 2022 DPRINTF(("faked-up node %p for %s\n", ni, 2023 ether_sprintf((u_int8_t *)wh->i_addr2))); 2024 2025 return ieee80211_ref_node(ni); 2026 } 2027 2028 struct ieee80211_node * 2029 ieee80211_find_node_for_beacon(struct ieee80211com *ic, 2030 const u_int8_t *macaddr, const struct ieee80211_channel *chan, 2031 const char *ssid, u_int8_t rssi) 2032 { 2033 struct ieee80211_node *ni, *keep = NULL; 2034 int s, score = 0; 2035 2036 if ((ni = ieee80211_find_node(ic, macaddr)) != NULL) { 2037 s = splnet(); 2038 2039 if (ni->ni_chan != chan && ni->ni_rssi >= rssi) 2040 score++; 2041 if (ssid[1] == 0 && ni->ni_esslen != 0) 2042 score++; 2043 if (score > 0) 2044 keep = ni; 2045 2046 splx(s); 2047 } 2048 2049 return (keep); 2050 } 2051 2052 void 2053 ieee80211_node_tx_ba_clear(struct ieee80211_node *ni, int tid) 2054 { 2055 struct ieee80211_tx_ba *ba = &ni->ni_tx_ba[tid]; 2056 2057 if (ba->ba_state != IEEE80211_BA_INIT) { 2058 if (timeout_pending(&ba->ba_to)) 2059 timeout_del(&ba->ba_to); 2060 ba->ba_state = IEEE80211_BA_INIT; 2061 } 2062 } 2063 2064 void 2065 ieee80211_ba_del(struct ieee80211_node *ni) 2066 { 2067 int tid; 2068 2069 for (tid = 0; tid < nitems(ni->ni_rx_ba); tid++) { 2070 struct ieee80211_rx_ba *ba = &ni->ni_rx_ba[tid]; 2071 if (ba->ba_state != IEEE80211_BA_INIT) { 2072 if (timeout_pending(&ba->ba_to)) 2073 timeout_del(&ba->ba_to); 2074 if (timeout_pending(&ba->ba_gap_to)) 2075 timeout_del(&ba->ba_gap_to); 2076 ba->ba_state = IEEE80211_BA_INIT; 2077 } 2078 } 2079 2080 for (tid = 0; tid < nitems(ni->ni_tx_ba); tid++) 2081 ieee80211_node_tx_ba_clear(ni, tid); 2082 2083 timeout_del(&ni->ni_addba_req_to[EDCA_AC_BE]); 2084 timeout_del(&ni->ni_addba_req_to[EDCA_AC_BK]); 2085 timeout_del(&ni->ni_addba_req_to[EDCA_AC_VI]); 2086 timeout_del(&ni->ni_addba_req_to[EDCA_AC_VO]); 2087 } 2088 2089 void 2090 ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 2091 { 2092 if (ni == ic->ic_bss) 2093 panic("freeing bss node"); 2094 2095 splassert(IPL_NET); 2096 2097 DPRINTF(("%s\n", ether_sprintf(ni->ni_macaddr))); 2098 #ifndef IEEE80211_STA_ONLY 2099 timeout_del(&ni->ni_eapol_to); 2100 timeout_del(&ni->ni_sa_query_to); 2101 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 2102 #endif 2103 ieee80211_ba_del(ni); 2104 RBT_REMOVE(ieee80211_tree, &ic->ic_tree, ni); 2105 ic->ic_nnodes--; 2106 #ifndef IEEE80211_STA_ONLY 2107 if (mq_purge(&ni->ni_savedq) > 0) { 2108 if (ic->ic_set_tim != NULL) 2109 (*ic->ic_set_tim)(ic, ni->ni_associd, 0); 2110 } 2111 #endif 2112 (*ic->ic_node_free)(ic, ni); 2113 /* TBD indicate to drivers that a new node can be allocated */ 2114 } 2115 2116 void 2117 ieee80211_release_node(struct ieee80211com *ic, struct ieee80211_node *ni) 2118 { 2119 int s; 2120 void (*ni_unref_cb)(struct ieee80211com *, struct ieee80211_node *); 2121 2122 DPRINTF(("%s refcnt %u\n", ether_sprintf(ni->ni_macaddr), 2123 ni->ni_refcnt)); 2124 s = splnet(); 2125 if (ieee80211_node_decref(ni) == 0) { 2126 if (ni->ni_unref_cb) { 2127 /* The callback may set ni->ni_unref_cb again. */ 2128 ni_unref_cb = ni->ni_unref_cb; 2129 ni->ni_unref_cb = NULL; 2130 /* Freed by callback if necessary: */ 2131 (*ni_unref_cb)(ic, ni); 2132 } 2133 if (ni->ni_state == IEEE80211_STA_COLLECT) 2134 ieee80211_free_node(ic, ni); 2135 } 2136 splx(s); 2137 } 2138 2139 void 2140 ieee80211_free_allnodes(struct ieee80211com *ic, int clear_ic_bss) 2141 { 2142 struct ieee80211_node *ni; 2143 int s; 2144 2145 DPRINTF(("freeing all nodes\n")); 2146 s = splnet(); 2147 while ((ni = RBT_MIN(ieee80211_tree, &ic->ic_tree)) != NULL) 2148 ieee80211_free_node(ic, ni); 2149 splx(s); 2150 2151 if (clear_ic_bss && ic->ic_bss != NULL) 2152 ieee80211_node_cleanup(ic, ic->ic_bss); 2153 } 2154 2155 void 2156 ieee80211_clean_cached(struct ieee80211com *ic) 2157 { 2158 struct ieee80211_node *ni, *next_ni; 2159 int s; 2160 2161 s = splnet(); 2162 for (ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); 2163 ni != NULL; ni = next_ni) { 2164 next_ni = RBT_NEXT(ieee80211_tree, ni); 2165 if (ni->ni_state == IEEE80211_STA_CACHE) 2166 ieee80211_free_node(ic, ni); 2167 } 2168 splx(s); 2169 } 2170 /* 2171 * Timeout inactive nodes. 2172 * 2173 * If called because of a cache timeout, which happens only in hostap and ibss 2174 * modes, clean all inactive cached or authenticated nodes but don't de-auth 2175 * any associated nodes. Also update HT protection settings. 2176 * 2177 * Else, this function is called because a new node must be allocated but the 2178 * node cache is full. In this case, return as soon as a free slot was made 2179 * available. If acting as hostap, clean cached nodes regardless of their 2180 * recent activity and also allow de-authing of authenticated nodes older 2181 * than one cache wait interval, and de-authing of inactive associated nodes. 2182 */ 2183 void 2184 ieee80211_clean_nodes(struct ieee80211com *ic, int cache_timeout) 2185 { 2186 struct ieee80211_node *ni, *next_ni; 2187 u_int gen = ic->ic_scangen++; /* NB: ok 'cuz single-threaded*/ 2188 int s; 2189 #ifndef IEEE80211_STA_ONLY 2190 int nnodes = 0, nonht = 0, nonhtassoc = 0; 2191 struct ifnet *ifp = &ic->ic_if; 2192 enum ieee80211_htprot htprot = IEEE80211_HTPROT_NONE; 2193 enum ieee80211_protmode protmode = IEEE80211_PROT_NONE; 2194 #endif 2195 2196 s = splnet(); 2197 for (ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); 2198 ni != NULL; ni = next_ni) { 2199 next_ni = RBT_NEXT(ieee80211_tree, ni); 2200 if (!cache_timeout && ic->ic_nnodes < ic->ic_max_nnodes) 2201 break; 2202 if (ni->ni_scangen == gen) /* previously handled */ 2203 continue; 2204 #ifndef IEEE80211_STA_ONLY 2205 nnodes++; 2206 if ((ic->ic_flags & IEEE80211_F_HTON) && cache_timeout) { 2207 /* 2208 * Check if node supports 802.11n. 2209 * Only require HT capabilities IE for this check. 2210 * Nodes might never reveal their supported MCS to us 2211 * unless they go through a full association sequence. 2212 * ieee80211_node_supports_ht() could misclassify them. 2213 */ 2214 if ((ni->ni_flags & IEEE80211_NODE_HTCAP) == 0) { 2215 nonht++; 2216 if (ni->ni_state == IEEE80211_STA_ASSOC) 2217 nonhtassoc++; 2218 } 2219 } 2220 #endif 2221 ni->ni_scangen = gen; 2222 if (ni->ni_refcnt > 0) 2223 continue; 2224 #ifndef IEEE80211_STA_ONLY 2225 if ((ic->ic_opmode == IEEE80211_M_HOSTAP || 2226 ic->ic_opmode == IEEE80211_M_IBSS) && 2227 ic->ic_state == IEEE80211_S_RUN) { 2228 if (cache_timeout) { 2229 if (ni->ni_state != IEEE80211_STA_COLLECT && 2230 (ni->ni_state == IEEE80211_STA_ASSOC || 2231 ni->ni_inact < IEEE80211_INACT_MAX)) 2232 continue; 2233 } else { 2234 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 2235 ((ni->ni_state == IEEE80211_STA_ASSOC && 2236 ni->ni_inact < IEEE80211_INACT_MAX) || 2237 (ni->ni_state == IEEE80211_STA_AUTH && 2238 ni->ni_inact == 0))) 2239 continue; 2240 2241 if (ic->ic_opmode == IEEE80211_M_IBSS && 2242 ni->ni_state != IEEE80211_STA_COLLECT && 2243 ni->ni_state != IEEE80211_STA_CACHE && 2244 ni->ni_inact < IEEE80211_INACT_MAX) 2245 continue; 2246 } 2247 } 2248 if (ifp->if_flags & IFF_DEBUG) 2249 printf("%s: station %s purged from node cache\n", 2250 ifp->if_xname, ether_sprintf(ni->ni_macaddr)); 2251 #endif 2252 /* 2253 * If we're hostap and the node is authenticated, send 2254 * a deauthentication frame. The node will be freed when 2255 * the driver calls ieee80211_release_node(). 2256 */ 2257 #ifndef IEEE80211_STA_ONLY 2258 nnodes--; 2259 if ((ic->ic_flags & IEEE80211_F_HTON) && cache_timeout) { 2260 if ((ni->ni_flags & IEEE80211_NODE_HTCAP) == 0) { 2261 nonht--; 2262 if (ni->ni_state == IEEE80211_STA_ASSOC) 2263 nonhtassoc--; 2264 } 2265 } 2266 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 2267 ni->ni_state >= IEEE80211_STA_AUTH && 2268 ni->ni_state != IEEE80211_STA_COLLECT) { 2269 IEEE80211_SEND_MGMT(ic, ni, 2270 IEEE80211_FC0_SUBTYPE_DEAUTH, 2271 IEEE80211_REASON_AUTH_EXPIRE); 2272 ieee80211_node_leave(ic, ni); 2273 } else 2274 #endif 2275 ieee80211_free_node(ic, ni); 2276 ic->ic_stats.is_node_timeout++; 2277 } 2278 2279 #ifndef IEEE80211_STA_ONLY 2280 if ((ic->ic_flags & IEEE80211_F_HTON) && cache_timeout) { 2281 uint16_t htop1 = ic->ic_bss->ni_htop1; 2282 2283 /* Update HT protection settings. */ 2284 if (nonht) { 2285 protmode = IEEE80211_PROT_CTSONLY; 2286 if (nonhtassoc) 2287 htprot = IEEE80211_HTPROT_NONHT_MIXED; 2288 else 2289 htprot = IEEE80211_HTPROT_NONMEMBER; 2290 } 2291 if ((htop1 & IEEE80211_HTOP1_PROT_MASK) != htprot) { 2292 htop1 &= ~IEEE80211_HTOP1_PROT_MASK; 2293 htop1 |= htprot; 2294 ic->ic_bss->ni_htop1 = htop1; 2295 ic->ic_protmode = protmode; 2296 if (ic->ic_updateprot) 2297 ic->ic_updateprot(ic); 2298 } 2299 } 2300 2301 /* 2302 * During a cache timeout we iterate over all nodes. 2303 * Check for node leaks by comparing the actual number of cached 2304 * nodes with the ic_nnodes count, which is maintained while adding 2305 * and removing nodes from the cache. 2306 */ 2307 if ((ifp->if_flags & IFF_DEBUG) && cache_timeout && 2308 nnodes != ic->ic_nnodes) 2309 printf("%s: number of cached nodes is %d, expected %d," 2310 "possible nodes leak\n", ifp->if_xname, nnodes, 2311 ic->ic_nnodes); 2312 #endif 2313 splx(s); 2314 } 2315 2316 void 2317 ieee80211_clean_inactive_nodes(struct ieee80211com *ic, int inact_max) 2318 { 2319 struct ieee80211_node *ni, *next_ni; 2320 u_int gen = ic->ic_scangen++; /* NB: ok 'cuz single-threaded*/ 2321 int s; 2322 2323 s = splnet(); 2324 for (ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); 2325 ni != NULL; ni = next_ni) { 2326 next_ni = RBT_NEXT(ieee80211_tree, ni); 2327 if (ni->ni_scangen == gen) /* previously handled */ 2328 continue; 2329 ni->ni_scangen = gen; 2330 if (ni->ni_refcnt > 0 || ni->ni_inact < inact_max) 2331 continue; 2332 ieee80211_free_node(ic, ni); 2333 ic->ic_stats.is_node_timeout++; 2334 } 2335 2336 splx(s); 2337 } 2338 2339 void 2340 ieee80211_iterate_nodes(struct ieee80211com *ic, ieee80211_iter_func *f, 2341 void *arg) 2342 { 2343 struct ieee80211_node *ni; 2344 int s; 2345 2346 s = splnet(); 2347 RBT_FOREACH(ni, ieee80211_tree, &ic->ic_tree) 2348 (*f)(arg, ni); 2349 splx(s); 2350 } 2351 2352 2353 /* 2354 * Install received HT caps information in the node's state block. 2355 */ 2356 void 2357 ieee80211_setup_htcaps(struct ieee80211_node *ni, const uint8_t *data, 2358 uint8_t len) 2359 { 2360 uint16_t rxrate; 2361 2362 if (len != 26) 2363 return; 2364 2365 ni->ni_htcaps = (data[0] | (data[1] << 8)); 2366 ni->ni_ampdu_param = data[2]; 2367 2368 memcpy(ni->ni_rxmcs, &data[3], sizeof(ni->ni_rxmcs)); 2369 /* clear reserved bits */ 2370 clrbit(ni->ni_rxmcs, 77); 2371 clrbit(ni->ni_rxmcs, 78); 2372 clrbit(ni->ni_rxmcs, 79); 2373 2374 /* Max MCS Rx rate in 1Mb/s units (0 means "not specified"). */ 2375 rxrate = ((data[13] | (data[14]) << 8) & IEEE80211_MCS_RX_RATE_HIGH); 2376 if (rxrate < 1024) 2377 ni->ni_max_rxrate = rxrate; 2378 2379 ni->ni_tx_mcs_set = data[15]; 2380 ni->ni_htxcaps = (data[19] | (data[20] << 8)); 2381 ni->ni_txbfcaps = (data[21] | (data[22] << 8) | (data[23] << 16) | 2382 (data[24] << 24)); 2383 ni->ni_aselcaps = data[25]; 2384 2385 ni->ni_flags |= IEEE80211_NODE_HTCAP; 2386 } 2387 2388 #ifndef IEEE80211_STA_ONLY 2389 /* 2390 * Handle nodes switching from 11n into legacy modes. 2391 */ 2392 void 2393 ieee80211_clear_htcaps(struct ieee80211_node *ni) 2394 { 2395 ni->ni_htcaps = 0; 2396 ni->ni_ampdu_param = 0; 2397 memset(ni->ni_rxmcs, 0, sizeof(ni->ni_rxmcs)); 2398 ni->ni_max_rxrate = 0; 2399 ni->ni_tx_mcs_set = 0; 2400 ni->ni_htxcaps = 0; 2401 ni->ni_txbfcaps = 0; 2402 ni->ni_aselcaps = 0; 2403 2404 ni->ni_flags &= ~(IEEE80211_NODE_HT | IEEE80211_NODE_HT_SGI20 | 2405 IEEE80211_NODE_HT_SGI40 | IEEE80211_NODE_HTCAP); 2406 2407 } 2408 #endif 2409 2410 /* 2411 * Install received HT op information in the node's state block. 2412 */ 2413 int 2414 ieee80211_setup_htop(struct ieee80211_node *ni, const uint8_t *data, 2415 uint8_t len, int isprobe) 2416 { 2417 if (len != 22) 2418 return 0; 2419 2420 ni->ni_primary_chan = data[0]; /* XXX corresponds to ni_chan */ 2421 2422 ni->ni_htop0 = data[1]; 2423 ni->ni_htop1 = (data[2] | (data[3] << 8)); 2424 ni->ni_htop2 = (data[3] | (data[4] << 8)); 2425 2426 /* 2427 * According to 802.11-2012 Table 8-130 the Basic MCS set is 2428 * only "present in Beacon, Probe Response, Mesh Peering Open 2429 * and Mesh Peering Confirm frames. Otherwise reserved." 2430 */ 2431 if (isprobe) 2432 memcpy(ni->ni_basic_mcs, &data[6], sizeof(ni->ni_basic_mcs)); 2433 2434 return 1; 2435 } 2436 2437 /* 2438 * Install received rate set information in the node's state block. 2439 */ 2440 int 2441 ieee80211_setup_rates(struct ieee80211com *ic, struct ieee80211_node *ni, 2442 const u_int8_t *rates, const u_int8_t *xrates, int flags) 2443 { 2444 struct ieee80211_rateset *rs = &ni->ni_rates; 2445 2446 memset(rs, 0, sizeof(*rs)); 2447 rs->rs_nrates = rates[1]; 2448 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 2449 if (xrates != NULL) { 2450 u_int8_t nxrates; 2451 /* 2452 * Tack on 11g extended supported rate element. 2453 */ 2454 nxrates = xrates[1]; 2455 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 2456 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 2457 DPRINTF(("extended rate set too large; " 2458 "only using %u of %u rates\n", 2459 nxrates, xrates[1])); 2460 ic->ic_stats.is_rx_rstoobig++; 2461 } 2462 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 2463 rs->rs_nrates += nxrates; 2464 } 2465 return ieee80211_fix_rate(ic, ni, flags); 2466 } 2467 2468 void 2469 ieee80211_node_trigger_addba_req(struct ieee80211_node *ni, int tid) 2470 { 2471 if (ni->ni_tx_ba[tid].ba_state == IEEE80211_BA_INIT && 2472 !timeout_pending(&ni->ni_addba_req_to[tid])) { 2473 timeout_add_sec(&ni->ni_addba_req_to[tid], 2474 ni->ni_addba_req_intval[tid]); 2475 } 2476 } 2477 2478 void 2479 ieee80211_node_addba_request(struct ieee80211_node *ni, int tid) 2480 { 2481 struct ieee80211com *ic = ni->ni_ic; 2482 uint16_t ssn = ni->ni_qos_txseqs[tid]; 2483 2484 ieee80211_addba_request(ic, ni, ssn, tid); 2485 } 2486 2487 void 2488 ieee80211_node_addba_request_ac_be_to(void *arg) 2489 { 2490 struct ieee80211_node *ni = arg; 2491 ieee80211_node_addba_request(ni, EDCA_AC_BE); 2492 } 2493 2494 void 2495 ieee80211_node_addba_request_ac_bk_to(void *arg) 2496 { 2497 struct ieee80211_node *ni = arg; 2498 ieee80211_node_addba_request(ni, EDCA_AC_BK); 2499 } 2500 2501 void 2502 ieee80211_node_addba_request_ac_vi_to(void *arg) 2503 { 2504 struct ieee80211_node *ni = arg; 2505 ieee80211_node_addba_request(ni, EDCA_AC_VI); 2506 } 2507 2508 void 2509 ieee80211_node_addba_request_ac_vo_to(void *arg) 2510 { 2511 struct ieee80211_node *ni = arg; 2512 ieee80211_node_addba_request(ni, EDCA_AC_VO); 2513 } 2514 2515 #ifndef IEEE80211_STA_ONLY 2516 /* 2517 * Check if the specified node supports ERP. 2518 */ 2519 int 2520 ieee80211_iserp_sta(const struct ieee80211_node *ni) 2521 { 2522 static const u_int8_t rates[] = { 2, 4, 11, 22, 12, 24, 48 }; 2523 const struct ieee80211_rateset *rs = &ni->ni_rates; 2524 int i, j; 2525 2526 /* 2527 * A STA supports ERP operation if it includes all the Clause 19 2528 * mandatory rates in its supported rate set. 2529 */ 2530 for (i = 0; i < nitems(rates); i++) { 2531 for (j = 0; j < rs->rs_nrates; j++) { 2532 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == rates[i]) 2533 break; 2534 } 2535 if (j == rs->rs_nrates) 2536 return 0; 2537 } 2538 return 1; 2539 } 2540 2541 /* 2542 * This function is called to notify the 802.1X PACP machine that a new 2543 * 802.1X port is enabled and must be authenticated. For 802.11, a port 2544 * becomes enabled whenever a STA successfully completes Open System 2545 * authentication with an AP. 2546 */ 2547 void 2548 ieee80211_needs_auth(struct ieee80211com *ic, struct ieee80211_node *ni) 2549 { 2550 /* 2551 * XXX this could be done via the route socket of via a dedicated 2552 * EAP socket or another kernel->userland notification mechanism. 2553 * The notification should include the MAC address (ni_macaddr). 2554 */ 2555 } 2556 2557 /* 2558 * Handle an HT STA joining an HT network. 2559 */ 2560 void 2561 ieee80211_node_join_ht(struct ieee80211com *ic, struct ieee80211_node *ni) 2562 { 2563 enum ieee80211_htprot; 2564 2565 /* Update HT protection setting. */ 2566 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2567 uint16_t htop1 = ic->ic_bss->ni_htop1; 2568 htop1 &= ~IEEE80211_HTOP1_PROT_MASK; 2569 htop1 |= IEEE80211_HTPROT_NONHT_MIXED; 2570 ic->ic_bss->ni_htop1 = htop1; 2571 if (ic->ic_updateprot) 2572 ic->ic_updateprot(ic); 2573 } 2574 } 2575 2576 /* 2577 * Handle a station joining an RSN network. 2578 */ 2579 void 2580 ieee80211_node_join_rsn(struct ieee80211com *ic, struct ieee80211_node *ni) 2581 { 2582 DPRINTF(("station %s associated using proto %d akm 0x%x " 2583 "cipher 0x%x groupcipher 0x%x\n", ether_sprintf(ni->ni_macaddr), 2584 ni->ni_rsnprotos, ni->ni_rsnakms, ni->ni_rsnciphers, 2585 ni->ni_rsngroupcipher)); 2586 2587 ni->ni_rsn_state = RSNA_AUTHENTICATION; 2588 2589 ni->ni_key_count = 0; 2590 ni->ni_port_valid = 0; 2591 ni->ni_flags &= ~IEEE80211_NODE_TXRXPROT; 2592 ni->ni_flags &= ~IEEE80211_NODE_RSN_NEW_PTK; 2593 ni->ni_replaycnt = -1; /* XXX */ 2594 ni->ni_rsn_retries = 0; 2595 ni->ni_rsncipher = ni->ni_rsnciphers; 2596 2597 ni->ni_rsn_state = RSNA_AUTHENTICATION_2; 2598 2599 /* generate a new authenticator nonce (ANonce) */ 2600 arc4random_buf(ni->ni_nonce, EAPOL_KEY_NONCE_LEN); 2601 2602 if (!ieee80211_is_8021x_akm(ni->ni_rsnakms)) { 2603 memcpy(ni->ni_pmk, ic->ic_psk, IEEE80211_PMK_LEN); 2604 ni->ni_flags |= IEEE80211_NODE_PMK; 2605 (void)ieee80211_send_4way_msg1(ic, ni); 2606 } else if (ni->ni_flags & IEEE80211_NODE_PMK) { 2607 /* skip 802.1X auth if a cached PMK was found */ 2608 (void)ieee80211_send_4way_msg1(ic, ni); 2609 } else { 2610 /* no cached PMK found, needs full 802.1X auth */ 2611 ieee80211_needs_auth(ic, ni); 2612 } 2613 } 2614 2615 void 2616 ieee80211_count_longslotsta(void *arg, struct ieee80211_node *ni) 2617 { 2618 int *longslotsta = arg; 2619 2620 if (ni->ni_associd == 0 || ni->ni_state == IEEE80211_STA_COLLECT) 2621 return; 2622 2623 if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) 2624 (*longslotsta)++; 2625 } 2626 2627 void 2628 ieee80211_count_nonerpsta(void *arg, struct ieee80211_node *ni) 2629 { 2630 int *nonerpsta = arg; 2631 2632 if (ni->ni_associd == 0 || ni->ni_state == IEEE80211_STA_COLLECT) 2633 return; 2634 2635 if (!ieee80211_iserp_sta(ni)) 2636 (*nonerpsta)++; 2637 } 2638 2639 void 2640 ieee80211_count_pssta(void *arg, struct ieee80211_node *ni) 2641 { 2642 int *pssta = arg; 2643 2644 if (ni->ni_associd == 0 || ni->ni_state == IEEE80211_STA_COLLECT) 2645 return; 2646 2647 if (ni->ni_pwrsave == IEEE80211_PS_DOZE) 2648 (*pssta)++; 2649 } 2650 2651 void 2652 ieee80211_count_rekeysta(void *arg, struct ieee80211_node *ni) 2653 { 2654 int *rekeysta = arg; 2655 2656 if (ni->ni_associd == 0 || ni->ni_state == IEEE80211_STA_COLLECT) 2657 return; 2658 2659 if (ni->ni_flags & IEEE80211_NODE_REKEY) 2660 (*rekeysta)++; 2661 } 2662 2663 /* 2664 * Handle a station joining an 11g network. 2665 */ 2666 void 2667 ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 2668 { 2669 int longslotsta = 0, nonerpsta = 0; 2670 2671 if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2672 /* 2673 * Joining STA doesn't support short slot time. We must 2674 * disable the use of short slot time for all other associated 2675 * STAs and give the driver a chance to reconfigure the 2676 * hardware. 2677 */ 2678 ieee80211_iterate_nodes(ic, 2679 ieee80211_count_longslotsta, &longslotsta); 2680 if (longslotsta == 1) { 2681 if (ic->ic_caps & IEEE80211_C_SHSLOT) 2682 ieee80211_set_shortslottime(ic, 0); 2683 } 2684 DPRINTF(("[%s] station needs long slot time, count %d\n", 2685 ether_sprintf(ni->ni_macaddr), longslotsta)); 2686 } 2687 2688 if (!ieee80211_iserp_sta(ni)) { 2689 /* 2690 * Joining STA is non-ERP. 2691 */ 2692 ieee80211_iterate_nodes(ic, 2693 ieee80211_count_nonerpsta, &nonerpsta); 2694 DPRINTF(("[%s] station is non-ERP, %d non-ERP " 2695 "stations associated\n", ether_sprintf(ni->ni_macaddr), 2696 nonerpsta)); 2697 /* must enable the use of protection */ 2698 if (ic->ic_protmode != IEEE80211_PROT_NONE) { 2699 DPRINTF(("enable use of protection\n")); 2700 ic->ic_flags |= IEEE80211_F_USEPROT; 2701 } 2702 2703 if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 2704 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 2705 } else 2706 ni->ni_flags |= IEEE80211_NODE_ERP; 2707 } 2708 2709 void 2710 ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, 2711 int resp) 2712 { 2713 int newassoc = (ni->ni_state != IEEE80211_STA_ASSOC); 2714 2715 if (ni->ni_associd == 0) { 2716 u_int16_t aid; 2717 2718 /* 2719 * It would be clever to search the bitmap 2720 * more efficiently, but this will do for now. 2721 */ 2722 for (aid = 1; aid < ic->ic_max_aid; aid++) { 2723 if (!IEEE80211_AID_ISSET(aid, 2724 ic->ic_aid_bitmap)) 2725 break; 2726 } 2727 if (aid >= ic->ic_max_aid) { 2728 IEEE80211_SEND_MGMT(ic, ni, resp, 2729 IEEE80211_REASON_ASSOC_TOOMANY); 2730 ieee80211_node_leave(ic, ni); 2731 return; 2732 } 2733 ni->ni_associd = aid | 0xc000; 2734 IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap); 2735 if (ic->ic_curmode == IEEE80211_MODE_11G || 2736 (ic->ic_curmode == IEEE80211_MODE_11N && 2737 IEEE80211_IS_CHAN_2GHZ(ic->ic_bss->ni_chan))) 2738 ieee80211_node_join_11g(ic, ni); 2739 } 2740 2741 DPRINTF(("station %s %s associated at aid %d\n", 2742 ether_sprintf(ni->ni_macaddr), newassoc ? "newly" : "already", 2743 ni->ni_associd & ~0xc000)); 2744 2745 ieee80211_ht_negotiate(ic, ni); 2746 if (ic->ic_flags & IEEE80211_F_HTON) 2747 ieee80211_node_join_ht(ic, ni); 2748 2749 /* give driver a chance to setup state like ni_txrate */ 2750 if (ic->ic_newassoc) 2751 (*ic->ic_newassoc)(ic, ni, newassoc); 2752 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS); 2753 ieee80211_node_newstate(ni, IEEE80211_STA_ASSOC); 2754 2755 if (!(ic->ic_flags & IEEE80211_F_RSNON)) { 2756 ni->ni_port_valid = 1; 2757 ni->ni_rsncipher = IEEE80211_CIPHER_USEGROUP; 2758 } else 2759 ieee80211_node_join_rsn(ic, ni); 2760 2761 #if NBRIDGE > 0 2762 /* 2763 * If the parent interface is a bridge port, learn 2764 * the node's address dynamically on this interface. 2765 */ 2766 if (ic->ic_if.if_bridgeidx != 0) 2767 bridge_update(&ic->ic_if, 2768 (struct ether_addr *)ni->ni_macaddr, 0); 2769 #endif 2770 } 2771 2772 /* 2773 * Handle an HT STA leaving an HT network. 2774 */ 2775 void 2776 ieee80211_node_leave_ht(struct ieee80211com *ic, struct ieee80211_node *ni) 2777 { 2778 struct ieee80211_rx_ba *ba; 2779 u_int8_t tid; 2780 int i; 2781 2782 /* free all Block Ack records */ 2783 ieee80211_ba_del(ni); 2784 for (tid = 0; tid < IEEE80211_NUM_TID; tid++) { 2785 ba = &ni->ni_rx_ba[tid]; 2786 if (ba->ba_buf != NULL) { 2787 for (i = 0; i < IEEE80211_BA_MAX_WINSZ; i++) 2788 m_freem(ba->ba_buf[i].m); 2789 free(ba->ba_buf, M_DEVBUF, 2790 IEEE80211_BA_MAX_WINSZ * sizeof(*ba->ba_buf)); 2791 ba->ba_buf = NULL; 2792 } 2793 } 2794 2795 ieee80211_clear_htcaps(ni); 2796 } 2797 2798 /* 2799 * Handle a station leaving an RSN network. 2800 */ 2801 void 2802 ieee80211_node_leave_rsn(struct ieee80211com *ic, struct ieee80211_node *ni) 2803 { 2804 int rekeysta = 0; 2805 2806 ni->ni_rsn_state = RSNA_INITIALIZE; 2807 if (ni->ni_flags & IEEE80211_NODE_REKEY) { 2808 ni->ni_flags &= ~IEEE80211_NODE_REKEY; 2809 ieee80211_iterate_nodes(ic, 2810 ieee80211_count_rekeysta, &rekeysta); 2811 if (rekeysta == 0) 2812 ieee80211_setkeysdone(ic); 2813 } 2814 ni->ni_flags &= ~IEEE80211_NODE_PMK; 2815 ni->ni_rsn_gstate = RSNA_IDLE; 2816 2817 timeout_del(&ni->ni_eapol_to); 2818 timeout_del(&ni->ni_sa_query_to); 2819 2820 ni->ni_rsn_retries = 0; 2821 ni->ni_flags &= ~IEEE80211_NODE_TXRXPROT; 2822 ni->ni_port_valid = 0; 2823 (*ic->ic_delete_key)(ic, ni, &ni->ni_pairwise_key); 2824 } 2825 2826 /* 2827 * Handle a station leaving an 11g network. 2828 */ 2829 void 2830 ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 2831 { 2832 int longslotsta = 0, nonerpsta = 0; 2833 2834 if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2835 /* leaving STA did not support short slot time */ 2836 ieee80211_iterate_nodes(ic, 2837 ieee80211_count_longslotsta, &longslotsta); 2838 if (longslotsta == 1) { 2839 /* 2840 * All associated STAs now support short slot time, so 2841 * enable this feature and give the driver a chance to 2842 * reconfigure the hardware. Notice that IBSS always 2843 * use a long slot time. 2844 */ 2845 if ((ic->ic_caps & IEEE80211_C_SHSLOT) && 2846 ic->ic_opmode != IEEE80211_M_IBSS) 2847 ieee80211_set_shortslottime(ic, 1); 2848 } 2849 DPRINTF(("[%s] long slot time station leaves, count %d\n", 2850 ether_sprintf(ni->ni_macaddr), longslotsta)); 2851 } 2852 2853 if (!(ni->ni_flags & IEEE80211_NODE_ERP)) { 2854 /* leaving STA was non-ERP */ 2855 ieee80211_iterate_nodes(ic, 2856 ieee80211_count_nonerpsta, &nonerpsta); 2857 if (nonerpsta == 1) { 2858 /* 2859 * All associated STAs are now ERP capable, disable use 2860 * of protection and re-enable short preamble support. 2861 */ 2862 ic->ic_flags &= ~IEEE80211_F_USEPROT; 2863 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 2864 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 2865 } 2866 DPRINTF(("[%s] non-ERP station leaves, count %d\n", 2867 ether_sprintf(ni->ni_macaddr), nonerpsta)); 2868 } 2869 } 2870 2871 void 2872 ieee80211_node_leave_pwrsave(struct ieee80211com *ic, 2873 struct ieee80211_node *ni) 2874 { 2875 struct mbuf_queue keep = MBUF_QUEUE_INITIALIZER(IFQ_MAXLEN, IPL_NET); 2876 struct mbuf *m; 2877 2878 if (ni->ni_pwrsave == IEEE80211_PS_DOZE) 2879 ni->ni_pwrsave = IEEE80211_PS_AWAKE; 2880 2881 if (mq_len(&ni->ni_savedq) > 0) { 2882 if (ic->ic_set_tim != NULL) 2883 (*ic->ic_set_tim)(ic, ni->ni_associd, 0); 2884 } 2885 while ((m = mq_dequeue(&ni->ni_savedq)) != NULL) { 2886 if (ni->ni_refcnt > 0) 2887 ieee80211_node_decref(ni); 2888 m_freem(m); 2889 } 2890 2891 /* Purge frames queued for transmission during DTIM. */ 2892 while ((m = mq_dequeue(&ic->ic_pwrsaveq)) != NULL) { 2893 if (m->m_pkthdr.ph_cookie == ni) { 2894 if (ni->ni_refcnt > 0) 2895 ieee80211_node_decref(ni); 2896 m_freem(m); 2897 } else 2898 mq_enqueue(&keep, m); 2899 } 2900 while ((m = mq_dequeue(&keep)) != NULL) 2901 mq_enqueue(&ic->ic_pwrsaveq, m); 2902 } 2903 2904 /* 2905 * Handle bookkeeping for station deauthentication/disassociation 2906 * when operating as an ap. 2907 */ 2908 void 2909 ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 2910 { 2911 if (ic->ic_opmode != IEEE80211_M_HOSTAP) 2912 panic("not in ap mode, mode %u", ic->ic_opmode); 2913 2914 if (ni->ni_state == IEEE80211_STA_COLLECT) 2915 return; 2916 /* 2917 * If node wasn't previously associated all we need to do is 2918 * reclaim the reference. 2919 */ 2920 if (ni->ni_associd == 0) { 2921 ieee80211_node_newstate(ni, IEEE80211_STA_COLLECT); 2922 return; 2923 } 2924 2925 ieee80211_node_leave_pwrsave(ic, ni); 2926 2927 if (ic->ic_flags & IEEE80211_F_RSNON) 2928 ieee80211_node_leave_rsn(ic, ni); 2929 2930 if (ic->ic_curmode == IEEE80211_MODE_11G || 2931 (ic->ic_curmode == IEEE80211_MODE_11N && 2932 IEEE80211_IS_CHAN_2GHZ(ic->ic_bss->ni_chan))) 2933 ieee80211_node_leave_11g(ic, ni); 2934 2935 if (ni->ni_flags & IEEE80211_NODE_HT) 2936 ieee80211_node_leave_ht(ic, ni); 2937 2938 if (ic->ic_node_leave != NULL) 2939 (*ic->ic_node_leave)(ic, ni); 2940 2941 ieee80211_node_newstate(ni, IEEE80211_STA_COLLECT); 2942 2943 #if NBRIDGE > 0 2944 /* 2945 * If the parent interface is a bridge port, delete 2946 * any dynamically learned address for this node. 2947 */ 2948 if (ic->ic_if.if_bridgeidx != 0) 2949 bridge_update(&ic->ic_if, 2950 (struct ether_addr *)ni->ni_macaddr, 1); 2951 #endif 2952 } 2953 2954 static int 2955 ieee80211_do_slow_print(struct ieee80211com *ic, int *did_print) 2956 { 2957 static const struct timeval merge_print_intvl = { 2958 .tv_sec = 1, .tv_usec = 0 2959 }; 2960 if ((ic->ic_if.if_flags & IFF_LINK0) == 0) 2961 return 0; 2962 if (!*did_print && (ic->ic_if.if_flags & IFF_DEBUG) == 0 && 2963 !ratecheck(&ic->ic_last_merge_print, &merge_print_intvl)) 2964 return 0; 2965 2966 *did_print = 1; 2967 return 1; 2968 } 2969 2970 /* ieee80211_ibss_merge helps merge 802.11 ad hoc networks. The 2971 * convention, set by the Wireless Ethernet Compatibility Alliance 2972 * (WECA), is that an 802.11 station will change its BSSID to match 2973 * the "oldest" 802.11 ad hoc network, on the same channel, that 2974 * has the station's desired SSID. The "oldest" 802.11 network 2975 * sends beacons with the greatest TSF timestamp. 2976 * 2977 * Return ENETRESET if the BSSID changed, 0 otherwise. 2978 * 2979 * XXX Perhaps we should compensate for the time that elapses 2980 * between the MAC receiving the beacon and the host processing it 2981 * in ieee80211_ibss_merge. 2982 */ 2983 int 2984 ieee80211_ibss_merge(struct ieee80211com *ic, struct ieee80211_node *ni, 2985 u_int64_t local_tsft) 2986 { 2987 u_int64_t beacon_tsft; 2988 int did_print = 0, sign; 2989 union { 2990 u_int64_t word; 2991 u_int8_t tstamp[8]; 2992 } u; 2993 2994 /* ensure alignment */ 2995 (void)memcpy(&u, &ni->ni_tstamp[0], sizeof(u)); 2996 beacon_tsft = letoh64(u.word); 2997 2998 /* we are faster, let the other guy catch up */ 2999 if (beacon_tsft < local_tsft) 3000 sign = -1; 3001 else 3002 sign = 1; 3003 3004 if (IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) { 3005 if (!ieee80211_do_slow_print(ic, &did_print)) 3006 return 0; 3007 printf("%s: tsft offset %s%llu\n", ic->ic_if.if_xname, 3008 (sign < 0) ? "-" : "", 3009 (sign < 0) 3010 ? (local_tsft - beacon_tsft) 3011 : (beacon_tsft - local_tsft)); 3012 return 0; 3013 } 3014 3015 if (sign < 0) 3016 return 0; 3017 3018 if (ieee80211_match_bss(ic, ni, 0) != 0) 3019 return 0; 3020 3021 if (ieee80211_do_slow_print(ic, &did_print)) { 3022 printf("%s: ieee80211_ibss_merge: bssid mismatch %s\n", 3023 ic->ic_if.if_xname, ether_sprintf(ni->ni_bssid)); 3024 printf("%s: my tsft %llu beacon tsft %llu\n", 3025 ic->ic_if.if_xname, local_tsft, beacon_tsft); 3026 printf("%s: sync TSF with %s\n", 3027 ic->ic_if.if_xname, ether_sprintf(ni->ni_macaddr)); 3028 } 3029 3030 ic->ic_flags &= ~IEEE80211_F_SIBSS; 3031 3032 /* negotiate rates with new IBSS */ 3033 ieee80211_fix_rate(ic, ni, IEEE80211_F_DOFRATE | 3034 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 3035 if (ni->ni_rates.rs_nrates == 0) { 3036 if (ieee80211_do_slow_print(ic, &did_print)) { 3037 printf("%s: rates mismatch, BSSID %s\n", 3038 ic->ic_if.if_xname, ether_sprintf(ni->ni_bssid)); 3039 } 3040 return 0; 3041 } 3042 3043 if (ieee80211_do_slow_print(ic, &did_print)) { 3044 printf("%s: sync BSSID %s -> ", 3045 ic->ic_if.if_xname, ether_sprintf(ic->ic_bss->ni_bssid)); 3046 printf("%s ", ether_sprintf(ni->ni_bssid)); 3047 printf("(from %s)\n", ether_sprintf(ni->ni_macaddr)); 3048 } 3049 3050 ieee80211_node_newstate(ni, IEEE80211_STA_BSS); 3051 (*ic->ic_node_copy)(ic, ic->ic_bss, ni); 3052 3053 return ENETRESET; 3054 } 3055 3056 void 3057 ieee80211_set_tim(struct ieee80211com *ic, int aid, int set) 3058 { 3059 if (set) 3060 setbit(ic->ic_tim_bitmap, aid & ~0xc000); 3061 else 3062 clrbit(ic->ic_tim_bitmap, aid & ~0xc000); 3063 } 3064 3065 /* 3066 * This function shall be called by drivers immediately after every DTIM. 3067 * Transmit all group addressed MSDUs buffered at the AP. 3068 */ 3069 void 3070 ieee80211_notify_dtim(struct ieee80211com *ic) 3071 { 3072 /* NB: group addressed MSDUs are buffered in ic_bss */ 3073 struct ieee80211_node *ni = ic->ic_bss; 3074 struct ifnet *ifp = &ic->ic_if; 3075 struct ieee80211_frame *wh; 3076 struct mbuf *m; 3077 3078 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP); 3079 3080 while ((m = mq_dequeue(&ni->ni_savedq)) != NULL) { 3081 if (!mq_empty(&ni->ni_savedq)) { 3082 /* more queued frames, set the more data bit */ 3083 wh = mtod(m, struct ieee80211_frame *); 3084 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 3085 } 3086 mq_enqueue(&ic->ic_pwrsaveq, m); 3087 if_start(ifp); 3088 } 3089 /* XXX assumes everything has been sent */ 3090 ic->ic_tim_mcast_pending = 0; 3091 } 3092 #endif /* IEEE80211_STA_ONLY */ 3093 3094 /* 3095 * Compare nodes in the tree by lladdr 3096 */ 3097 int 3098 ieee80211_node_cmp(const struct ieee80211_node *b1, 3099 const struct ieee80211_node *b2) 3100 { 3101 return (memcmp(b1->ni_macaddr, b2->ni_macaddr, IEEE80211_ADDR_LEN)); 3102 } 3103 3104 /* 3105 * Compare nodes in the tree by essid 3106 */ 3107 int 3108 ieee80211_ess_cmp(const struct ieee80211_ess_rbt *b1, 3109 const struct ieee80211_ess_rbt *b2) 3110 { 3111 return (memcmp(b1->essid, b2->essid, IEEE80211_NWID_LEN)); 3112 } 3113 3114 /* 3115 * Generate red-black tree function logic 3116 */ 3117 RBT_GENERATE(ieee80211_tree, ieee80211_node, ni_node, ieee80211_node_cmp); 3118 RBT_GENERATE(ieee80211_ess_tree, ieee80211_ess_rbt, ess_rbt, ieee80211_ess_cmp); 3119