1 /* $OpenBSD: ieee80211_node.c,v 1.103 2016/05/21 09:07:11 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 void ieee80211_setup_node(struct ieee80211com *, struct ieee80211_node *, 69 const u_int8_t *); 70 void ieee80211_free_node(struct ieee80211com *, struct ieee80211_node *); 71 void ieee80211_ba_del(struct ieee80211_node *); 72 struct ieee80211_node *ieee80211_alloc_node_helper(struct ieee80211com *); 73 void ieee80211_node_cleanup(struct ieee80211com *, struct ieee80211_node *); 74 void ieee80211_needs_auth(struct ieee80211com *, struct ieee80211_node *); 75 #ifndef IEEE80211_STA_ONLY 76 void ieee80211_node_join_ht(struct ieee80211com *, struct ieee80211_node *); 77 void ieee80211_node_join_rsn(struct ieee80211com *, struct ieee80211_node *); 78 void ieee80211_node_join_11g(struct ieee80211com *, struct ieee80211_node *); 79 void ieee80211_node_leave_ht(struct ieee80211com *, struct ieee80211_node *); 80 void ieee80211_node_leave_rsn(struct ieee80211com *, struct ieee80211_node *); 81 void ieee80211_node_leave_11g(struct ieee80211com *, struct ieee80211_node *); 82 void ieee80211_inact_timeout(void *); 83 void ieee80211_node_cache_timeout(void *); 84 #endif 85 86 #ifndef IEEE80211_STA_ONLY 87 void 88 ieee80211_inact_timeout(void *arg) 89 { 90 struct ieee80211com *ic = arg; 91 struct ieee80211_node *ni, *next_ni; 92 int s; 93 94 s = splnet(); 95 for (ni = RB_MIN(ieee80211_tree, &ic->ic_tree); 96 ni != NULL; ni = next_ni) { 97 next_ni = RB_NEXT(ieee80211_tree, &ic->ic_tree, ni); 98 if (ni->ni_refcnt > 0) 99 continue; 100 if (ni->ni_inact < IEEE80211_INACT_MAX) 101 ni->ni_inact++; 102 } 103 splx(s); 104 105 timeout_add_sec(&ic->ic_inact_timeout, IEEE80211_INACT_WAIT); 106 } 107 108 void 109 ieee80211_node_cache_timeout(void *arg) 110 { 111 struct ieee80211com *ic = arg; 112 113 ieee80211_clean_nodes(ic, 1); 114 timeout_add_sec(&ic->ic_node_cache_timeout, IEEE80211_CACHE_WAIT); 115 } 116 #endif 117 118 void 119 ieee80211_node_attach(struct ifnet *ifp) 120 { 121 struct ieee80211com *ic = (void *)ifp; 122 #ifndef IEEE80211_STA_ONLY 123 int size; 124 #endif 125 126 RB_INIT(&ic->ic_tree); 127 ic->ic_node_alloc = ieee80211_node_alloc; 128 ic->ic_node_free = ieee80211_node_free; 129 ic->ic_node_copy = ieee80211_node_copy; 130 ic->ic_node_getrssi = ieee80211_node_getrssi; 131 ic->ic_scangen = 1; 132 ic->ic_max_nnodes = ieee80211_cache_size; 133 134 if (ic->ic_max_aid == 0) 135 ic->ic_max_aid = IEEE80211_AID_DEF; 136 else if (ic->ic_max_aid > IEEE80211_AID_MAX) 137 ic->ic_max_aid = IEEE80211_AID_MAX; 138 #ifndef IEEE80211_STA_ONLY 139 size = howmany(ic->ic_max_aid, 32) * sizeof(u_int32_t); 140 ic->ic_aid_bitmap = malloc(size, M_DEVBUF, M_NOWAIT | M_ZERO); 141 if (ic->ic_aid_bitmap == NULL) { 142 /* XXX no way to recover */ 143 printf("%s: no memory for AID bitmap!\n", __func__); 144 ic->ic_max_aid = 0; 145 } 146 if (ic->ic_caps & (IEEE80211_C_HOSTAP | IEEE80211_C_IBSS)) { 147 ic->ic_tim_len = howmany(ic->ic_max_aid, 8); 148 ic->ic_tim_bitmap = malloc(ic->ic_tim_len, M_DEVBUF, 149 M_NOWAIT | M_ZERO); 150 if (ic->ic_tim_bitmap == NULL) { 151 printf("%s: no memory for TIM bitmap!\n", __func__); 152 ic->ic_tim_len = 0; 153 } else 154 ic->ic_set_tim = ieee80211_set_tim; 155 timeout_set(&ic->ic_rsn_timeout, 156 ieee80211_gtk_rekey_timeout, ic); 157 timeout_set(&ic->ic_inact_timeout, 158 ieee80211_inact_timeout, ic); 159 timeout_set(&ic->ic_node_cache_timeout, 160 ieee80211_node_cache_timeout, ic); 161 } 162 #endif 163 } 164 165 struct ieee80211_node * 166 ieee80211_alloc_node_helper(struct ieee80211com *ic) 167 { 168 struct ieee80211_node *ni; 169 if (ic->ic_nnodes >= ic->ic_max_nnodes) 170 ieee80211_clean_nodes(ic, 0); 171 if (ic->ic_nnodes >= ic->ic_max_nnodes) 172 return NULL; 173 ni = (*ic->ic_node_alloc)(ic); 174 return ni; 175 } 176 177 void 178 ieee80211_node_lateattach(struct ifnet *ifp) 179 { 180 struct ieee80211com *ic = (void *)ifp; 181 struct ieee80211_node *ni; 182 183 ni = ieee80211_alloc_node_helper(ic); 184 if (ni == NULL) 185 panic("unable to setup inital BSS node"); 186 ni->ni_chan = IEEE80211_CHAN_ANYC; 187 ic->ic_bss = ieee80211_ref_node(ni); 188 ic->ic_txpower = IEEE80211_TXPOWER_MAX; 189 #ifndef IEEE80211_STA_ONLY 190 mq_init(&ni->ni_savedq, IEEE80211_PS_MAX_QUEUE, IPL_NET); 191 #endif 192 } 193 194 void 195 ieee80211_node_detach(struct ifnet *ifp) 196 { 197 struct ieee80211com *ic = (void *)ifp; 198 199 if (ic->ic_bss != NULL) { 200 (*ic->ic_node_free)(ic, ic->ic_bss); 201 ic->ic_bss = NULL; 202 } 203 ieee80211_free_allnodes(ic); 204 #ifndef IEEE80211_STA_ONLY 205 if (ic->ic_aid_bitmap != NULL) 206 free(ic->ic_aid_bitmap, M_DEVBUF, 0); 207 if (ic->ic_tim_bitmap != NULL) 208 free(ic->ic_tim_bitmap, M_DEVBUF, 0); 209 timeout_del(&ic->ic_inact_timeout); 210 timeout_del(&ic->ic_node_cache_timeout); 211 #endif 212 timeout_del(&ic->ic_rsn_timeout); 213 } 214 215 /* 216 * AP scanning support. 217 */ 218 219 /* 220 * Initialize the active channel set based on the set 221 * of available channels and the current PHY mode. 222 */ 223 void 224 ieee80211_reset_scan(struct ifnet *ifp) 225 { 226 struct ieee80211com *ic = (void *)ifp; 227 228 memcpy(ic->ic_chan_scan, ic->ic_chan_active, 229 sizeof(ic->ic_chan_active)); 230 /* NB: hack, setup so next_scan starts with the first channel */ 231 if (ic->ic_bss != NULL && ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC) 232 ic->ic_bss->ni_chan = &ic->ic_channels[IEEE80211_CHAN_MAX]; 233 } 234 235 /* 236 * Begin an active scan. 237 */ 238 void 239 ieee80211_begin_scan(struct ifnet *ifp) 240 { 241 struct ieee80211com *ic = (void *)ifp; 242 243 if (ic->ic_scan_lock & IEEE80211_SCAN_LOCKED) 244 return; 245 ic->ic_scan_lock |= IEEE80211_SCAN_LOCKED; 246 247 /* 248 * In all but hostap mode scanning starts off in 249 * an active mode before switching to passive. 250 */ 251 #ifndef IEEE80211_STA_ONLY 252 if (ic->ic_opmode != IEEE80211_M_HOSTAP) 253 #endif 254 { 255 ic->ic_flags |= IEEE80211_F_ASCAN; 256 ic->ic_stats.is_scan_active++; 257 } 258 #ifndef IEEE80211_STA_ONLY 259 else 260 ic->ic_stats.is_scan_passive++; 261 #endif 262 if (ifp->if_flags & IFF_DEBUG) 263 printf("%s: begin %s scan\n", ifp->if_xname, 264 (ic->ic_flags & IEEE80211_F_ASCAN) ? 265 "active" : "passive"); 266 267 /* 268 * Flush any previously seen AP's. Note that the latter 269 * assumes we don't act as both an AP and a station, 270 * otherwise we'll potentially flush state of stations 271 * associated with us. 272 */ 273 ieee80211_free_allnodes(ic); 274 275 /* 276 * Reset the current mode. Setting the current mode will also 277 * reset scan state. 278 */ 279 if (IFM_MODE(ic->ic_media.ifm_cur->ifm_media) == IFM_AUTO) 280 ic->ic_curmode = IEEE80211_MODE_AUTO; 281 ieee80211_setmode(ic, ic->ic_curmode); 282 283 ic->ic_scan_count = 0; 284 285 /* Scan the next channel. */ 286 ieee80211_next_scan(ifp); 287 } 288 289 /* 290 * Switch to the next channel marked for scanning. 291 */ 292 void 293 ieee80211_next_scan(struct ifnet *ifp) 294 { 295 struct ieee80211com *ic = (void *)ifp; 296 struct ieee80211_channel *chan; 297 298 chan = ic->ic_bss->ni_chan; 299 for (;;) { 300 if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) 301 chan = &ic->ic_channels[0]; 302 if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { 303 /* 304 * Ignore channels marked passive-only 305 * during an active scan. 306 */ 307 if ((ic->ic_flags & IEEE80211_F_ASCAN) == 0 || 308 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) 309 break; 310 } 311 if (chan == ic->ic_bss->ni_chan) { 312 ieee80211_end_scan(ifp); 313 return; 314 } 315 } 316 clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); 317 DPRINTF(("chan %d->%d\n", 318 ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan), 319 ieee80211_chan2ieee(ic, chan))); 320 ic->ic_bss->ni_chan = chan; 321 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 322 } 323 324 #ifndef IEEE80211_STA_ONLY 325 void 326 ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) 327 { 328 struct ieee80211_node *ni; 329 struct ifnet *ifp = &ic->ic_if; 330 331 ni = ic->ic_bss; 332 if (ifp->if_flags & IFF_DEBUG) 333 printf("%s: creating ibss\n", ifp->if_xname); 334 ic->ic_flags |= IEEE80211_F_SIBSS; 335 ni->ni_chan = chan; 336 ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)]; 337 ni->ni_txrate = 0; 338 IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr); 339 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); 340 if (ic->ic_opmode == IEEE80211_M_IBSS) { 341 if ((ic->ic_flags & IEEE80211_F_DESBSSID) != 0) 342 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid); 343 else 344 ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ 345 } 346 ni->ni_esslen = ic->ic_des_esslen; 347 memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); 348 ni->ni_rssi = 0; 349 ni->ni_rstamp = 0; 350 memset(ni->ni_tstamp, 0, sizeof(ni->ni_tstamp)); 351 ni->ni_intval = ic->ic_lintval; 352 ni->ni_capinfo = IEEE80211_CAPINFO_IBSS; 353 if (ic->ic_flags & IEEE80211_F_WEPON) 354 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; 355 if (ic->ic_flags & IEEE80211_F_RSNON) { 356 struct ieee80211_key *k; 357 358 /* initialize 256-bit global key counter to a random value */ 359 arc4random_buf(ic->ic_globalcnt, EAPOL_KEY_NONCE_LEN); 360 361 ni->ni_rsnprotos = ic->ic_rsnprotos; 362 ni->ni_rsnakms = ic->ic_rsnakms; 363 ni->ni_rsnciphers = ic->ic_rsnciphers; 364 ni->ni_rsngroupcipher = ic->ic_rsngroupcipher; 365 ni->ni_rsngroupmgmtcipher = ic->ic_rsngroupmgmtcipher; 366 ni->ni_rsncaps = 0; 367 if (ic->ic_caps & IEEE80211_C_MFP) { 368 ni->ni_rsncaps |= IEEE80211_RSNCAP_MFPC; 369 if (ic->ic_flags & IEEE80211_F_MFPR) 370 ni->ni_rsncaps |= IEEE80211_RSNCAP_MFPR; 371 } 372 373 ic->ic_def_txkey = 1; 374 k = &ic->ic_nw_keys[ic->ic_def_txkey]; 375 memset(k, 0, sizeof(*k)); 376 k->k_id = ic->ic_def_txkey; 377 k->k_cipher = ni->ni_rsngroupcipher; 378 k->k_flags = IEEE80211_KEY_GROUP | IEEE80211_KEY_TX; 379 k->k_len = ieee80211_cipher_keylen(k->k_cipher); 380 arc4random_buf(k->k_key, k->k_len); 381 (*ic->ic_set_key)(ic, ni, k); /* XXX */ 382 383 if (ic->ic_caps & IEEE80211_C_MFP) { 384 ic->ic_igtk_kid = 4; 385 k = &ic->ic_nw_keys[ic->ic_igtk_kid]; 386 memset(k, 0, sizeof(*k)); 387 k->k_id = ic->ic_igtk_kid; 388 k->k_cipher = ni->ni_rsngroupmgmtcipher; 389 k->k_flags = IEEE80211_KEY_IGTK | IEEE80211_KEY_TX; 390 k->k_len = 16; 391 arc4random_buf(k->k_key, k->k_len); 392 (*ic->ic_set_key)(ic, ni, k); /* XXX */ 393 } 394 /* 395 * In HostAP mode, multicast traffic is sent using ic_bss 396 * as the Tx node, so mark our node as valid so we can send 397 * multicast frames using the group key we've just configured. 398 */ 399 ni->ni_port_valid = 1; 400 ni->ni_flags |= IEEE80211_NODE_TXPROT; 401 402 /* schedule a GTK/IGTK rekeying after 3600s */ 403 timeout_add_sec(&ic->ic_rsn_timeout, 3600); 404 } 405 timeout_add_sec(&ic->ic_inact_timeout, IEEE80211_INACT_WAIT); 406 timeout_add_sec(&ic->ic_node_cache_timeout, IEEE80211_CACHE_WAIT); 407 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 408 } 409 #endif /* IEEE80211_STA_ONLY */ 410 411 int 412 ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni) 413 { 414 u_int8_t rate; 415 int fail; 416 417 fail = 0; 418 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) 419 fail |= 0x01; 420 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 421 ni->ni_chan != ic->ic_des_chan) 422 fail |= 0x01; 423 #ifndef IEEE80211_STA_ONLY 424 if (ic->ic_opmode == IEEE80211_M_IBSS) { 425 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 426 fail |= 0x02; 427 } else 428 #endif 429 { 430 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) 431 fail |= 0x02; 432 } 433 if (ic->ic_flags & (IEEE80211_F_WEPON | IEEE80211_F_RSNON)) { 434 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 435 fail |= 0x04; 436 } else { 437 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) 438 fail |= 0x04; 439 } 440 441 rate = ieee80211_fix_rate(ic, ni, IEEE80211_F_DONEGO); 442 if (rate & IEEE80211_RATE_BASIC) 443 fail |= 0x08; 444 if (ic->ic_des_esslen != 0 && 445 (ni->ni_esslen != ic->ic_des_esslen || 446 memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0)) 447 fail |= 0x10; 448 if ((ic->ic_flags & IEEE80211_F_DESBSSID) && 449 !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) 450 fail |= 0x20; 451 452 if (ic->ic_flags & IEEE80211_F_RSNON) { 453 /* 454 * If at least one RSN IE field from the AP's RSN IE fails 455 * to overlap with any value the STA supports, the STA shall 456 * decline to associate with that AP. 457 */ 458 if ((ni->ni_rsnprotos & ic->ic_rsnprotos) == 0) 459 fail |= 0x40; 460 if ((ni->ni_rsnakms & ic->ic_rsnakms) == 0) 461 fail |= 0x40; 462 if ((ni->ni_rsnakms & ic->ic_rsnakms & 463 ~(IEEE80211_AKM_PSK | IEEE80211_AKM_SHA256_PSK)) == 0) { 464 /* AP only supports PSK AKMPs */ 465 if (!(ic->ic_flags & IEEE80211_F_PSK)) 466 fail |= 0x40; 467 } 468 if (ni->ni_rsngroupcipher != IEEE80211_CIPHER_WEP40 && 469 ni->ni_rsngroupcipher != IEEE80211_CIPHER_TKIP && 470 ni->ni_rsngroupcipher != IEEE80211_CIPHER_CCMP && 471 ni->ni_rsngroupcipher != IEEE80211_CIPHER_WEP104) 472 fail |= 0x40; 473 if ((ni->ni_rsnciphers & ic->ic_rsnciphers) == 0) 474 fail |= 0x40; 475 476 /* we only support BIP as the IGTK cipher */ 477 if ((ni->ni_rsncaps & IEEE80211_RSNCAP_MFPC) && 478 ni->ni_rsngroupmgmtcipher != IEEE80211_CIPHER_BIP) 479 fail |= 0x40; 480 481 /* we do not support MFP but AP requires it */ 482 if (!(ic->ic_caps & IEEE80211_C_MFP) && 483 (ni->ni_rsncaps & IEEE80211_RSNCAP_MFPR)) 484 fail |= 0x40; 485 486 /* we require MFP but AP does not support it */ 487 if ((ic->ic_caps & IEEE80211_C_MFP) && 488 (ic->ic_flags & IEEE80211_F_MFPR) && 489 !(ni->ni_rsncaps & IEEE80211_RSNCAP_MFPC)) 490 fail |= 0x40; 491 } 492 493 #ifdef IEEE80211_DEBUG 494 if (ic->ic_if.if_flags & IFF_DEBUG) { 495 printf(" %c %s", fail ? '-' : '+', 496 ether_sprintf(ni->ni_macaddr)); 497 printf(" %s%c", ether_sprintf(ni->ni_bssid), 498 fail & 0x20 ? '!' : ' '); 499 printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), 500 fail & 0x01 ? '!' : ' '); 501 printf(" %+4d", ni->ni_rssi); 502 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 503 fail & 0x08 ? '!' : ' '); 504 printf(" %4s%c", 505 (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 506 (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 507 "????", 508 fail & 0x02 ? '!' : ' '); 509 printf(" %7s%c ", 510 (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 511 "privacy" : "no", 512 fail & 0x04 ? '!' : ' '); 513 printf(" %3s%c ", 514 (ic->ic_flags & IEEE80211_F_RSNON) ? 515 "rsn" : "no", 516 fail & 0x40 ? '!' : ' '); 517 ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); 518 printf("%s\n", fail & 0x10 ? "!" : ""); 519 } 520 #endif 521 return fail; 522 } 523 524 /* 525 * Complete a scan of potential channels. 526 */ 527 void 528 ieee80211_end_scan(struct ifnet *ifp) 529 { 530 struct ieee80211com *ic = (void *)ifp; 531 struct ieee80211_node *ni, *nextbs, *selbs; 532 533 if (ifp->if_flags & IFF_DEBUG) 534 printf("%s: end %s scan\n", ifp->if_xname, 535 (ic->ic_flags & IEEE80211_F_ASCAN) ? 536 "active" : "passive"); 537 538 if (ic->ic_scan_count) 539 ic->ic_flags &= ~IEEE80211_F_ASCAN; 540 541 ni = RB_MIN(ieee80211_tree, &ic->ic_tree); 542 543 #ifndef IEEE80211_STA_ONLY 544 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 545 /* XXX off stack? */ 546 u_char occupied[howmany(IEEE80211_CHAN_MAX, NBBY)]; 547 int i, fail; 548 549 /* 550 * The passive scan to look for existing AP's completed, 551 * select a channel to camp on. Identify the channels 552 * that already have one or more AP's and try to locate 553 * an unoccupied one. If that fails, pick a random 554 * channel from the active set. 555 */ 556 memset(occupied, 0, sizeof(occupied)); 557 RB_FOREACH(ni, ieee80211_tree, &ic->ic_tree) 558 setbit(occupied, ieee80211_chan2ieee(ic, ni->ni_chan)); 559 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 560 if (isset(ic->ic_chan_active, i) && isclr(occupied, i)) 561 break; 562 if (i == IEEE80211_CHAN_MAX) { 563 fail = arc4random() & 3; /* random 0-3 */ 564 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 565 if (isset(ic->ic_chan_active, i) && fail-- == 0) 566 break; 567 } 568 ieee80211_create_ibss(ic, &ic->ic_channels[i]); 569 goto wakeup; 570 } 571 #endif 572 if (ni == NULL) { 573 DPRINTF(("no scan candidate\n")); 574 notfound: 575 576 #ifndef IEEE80211_STA_ONLY 577 if (ic->ic_opmode == IEEE80211_M_IBSS && 578 (ic->ic_flags & IEEE80211_F_IBSSON) && 579 ic->ic_des_esslen != 0) { 580 ieee80211_create_ibss(ic, ic->ic_ibss_chan); 581 goto wakeup; 582 } 583 #endif 584 /* 585 * Scan the next mode if nothing has been found. This 586 * is necessary if the device supports different 587 * incompatible modes in the same channel range, like 588 * like 11b and "pure" 11G mode. 589 * If the device scans all bands in one fell swoop, return 590 * current scan results to userspace regardless of mode. 591 * This will loop forever except for user-initiated scans. 592 */ 593 if (ieee80211_next_mode(ifp) == IEEE80211_MODE_AUTO || 594 (ic->ic_caps & IEEE80211_C_SCANALLBAND)) { 595 if (ic->ic_scan_lock & IEEE80211_SCAN_REQUEST && 596 ic->ic_scan_lock & IEEE80211_SCAN_RESUME) { 597 ic->ic_scan_lock = IEEE80211_SCAN_LOCKED; 598 /* Return from a user-initiated scan. */ 599 wakeup(&ic->ic_scan_lock); 600 } else if (ic->ic_scan_lock & IEEE80211_SCAN_REQUEST) 601 goto wakeup; 602 ic->ic_scan_count++; 603 } 604 605 /* 606 * Reset the list of channels to scan and start again. 607 */ 608 ieee80211_next_scan(ifp); 609 return; 610 } 611 selbs = NULL; 612 613 for (; ni != NULL; ni = nextbs) { 614 nextbs = RB_NEXT(ieee80211_tree, &ic->ic_tree, ni); 615 if (ni->ni_fails) { 616 /* 617 * The configuration of the access points may change 618 * during my scan. So delete the entry for the AP 619 * and retry to associate if there is another beacon. 620 */ 621 if (ni->ni_fails++ > 2) 622 ieee80211_free_node(ic, ni); 623 continue; 624 } 625 if (ieee80211_match_bss(ic, ni) == 0) { 626 if (selbs == NULL) 627 selbs = ni; 628 else if (ni->ni_rssi > selbs->ni_rssi) 629 selbs = ni; 630 } 631 } 632 if (selbs == NULL) 633 goto notfound; 634 (*ic->ic_node_copy)(ic, ic->ic_bss, selbs); 635 ni = ic->ic_bss; 636 637 ic->ic_curmode = ieee80211_chan2mode(ic, ni->ni_chan); 638 639 if (ic->ic_flags & IEEE80211_F_RSNON) 640 ieee80211_choose_rsnparams(ic); 641 else if (ic->ic_flags & IEEE80211_F_WEPON) 642 ni->ni_rsncipher = IEEE80211_CIPHER_USEGROUP; 643 644 ieee80211_node_newstate(selbs, IEEE80211_STA_BSS); 645 #ifndef IEEE80211_STA_ONLY 646 if (ic->ic_opmode == IEEE80211_M_IBSS) { 647 ieee80211_fix_rate(ic, ni, IEEE80211_F_DOFRATE | 648 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 649 if (ni->ni_rates.rs_nrates == 0) 650 goto notfound; 651 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 652 } else 653 #endif 654 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 655 656 wakeup: 657 if (ic->ic_scan_lock & IEEE80211_SCAN_REQUEST) { 658 /* Return from a user-initiated scan. */ 659 wakeup(&ic->ic_scan_lock); 660 } 661 662 ic->ic_scan_lock = IEEE80211_SCAN_UNLOCKED; 663 } 664 665 /* 666 * Autoselect the best RSN parameters (protocol, AKMP, pairwise cipher...) 667 * that are supported by both peers (STA mode only). 668 */ 669 void 670 ieee80211_choose_rsnparams(struct ieee80211com *ic) 671 { 672 struct ieee80211_node *ni = ic->ic_bss; 673 struct ieee80211_pmk *pmk; 674 675 /* filter out unsupported protocol versions */ 676 ni->ni_rsnprotos &= ic->ic_rsnprotos; 677 /* prefer RSN (aka WPA2) over WPA */ 678 if (ni->ni_rsnprotos & IEEE80211_PROTO_RSN) 679 ni->ni_rsnprotos = IEEE80211_PROTO_RSN; 680 else 681 ni->ni_rsnprotos = IEEE80211_PROTO_WPA; 682 683 /* filter out unsupported AKMPs */ 684 ni->ni_rsnakms &= ic->ic_rsnakms; 685 /* prefer SHA-256 based AKMPs */ 686 if ((ic->ic_flags & IEEE80211_F_PSK) && (ni->ni_rsnakms & 687 (IEEE80211_AKM_PSK | IEEE80211_AKM_SHA256_PSK))) { 688 /* AP supports PSK AKMP and a PSK is configured */ 689 if (ni->ni_rsnakms & IEEE80211_AKM_SHA256_PSK) 690 ni->ni_rsnakms = IEEE80211_AKM_SHA256_PSK; 691 else 692 ni->ni_rsnakms = IEEE80211_AKM_PSK; 693 } else { 694 if (ni->ni_rsnakms & IEEE80211_AKM_SHA256_8021X) 695 ni->ni_rsnakms = IEEE80211_AKM_SHA256_8021X; 696 else 697 ni->ni_rsnakms = IEEE80211_AKM_8021X; 698 /* check if we have a cached PMK for this AP */ 699 if (ni->ni_rsnprotos == IEEE80211_PROTO_RSN && 700 (pmk = ieee80211_pmksa_find(ic, ni, NULL)) != NULL) { 701 memcpy(ni->ni_pmkid, pmk->pmk_pmkid, 702 IEEE80211_PMKID_LEN); 703 ni->ni_flags |= IEEE80211_NODE_PMKID; 704 } 705 } 706 707 /* filter out unsupported pairwise ciphers */ 708 ni->ni_rsnciphers &= ic->ic_rsnciphers; 709 /* prefer CCMP over TKIP */ 710 if (ni->ni_rsnciphers & IEEE80211_CIPHER_CCMP) 711 ni->ni_rsnciphers = IEEE80211_CIPHER_CCMP; 712 else 713 ni->ni_rsnciphers = IEEE80211_CIPHER_TKIP; 714 ni->ni_rsncipher = ni->ni_rsnciphers; 715 716 /* use MFP if we both support it */ 717 if ((ic->ic_caps & IEEE80211_C_MFP) && 718 (ni->ni_rsncaps & IEEE80211_RSNCAP_MFPC)) 719 ni->ni_flags |= IEEE80211_NODE_MFP; 720 } 721 722 int 723 ieee80211_get_rate(struct ieee80211com *ic) 724 { 725 u_int8_t (*rates)[IEEE80211_RATE_MAXSIZE]; 726 int rate; 727 728 rates = &ic->ic_bss->ni_rates.rs_rates; 729 730 if (ic->ic_fixed_rate != -1) 731 rate = (*rates)[ic->ic_fixed_rate]; 732 else if (ic->ic_state == IEEE80211_S_RUN) 733 rate = (*rates)[ic->ic_bss->ni_txrate]; 734 else 735 rate = 0; 736 737 return rate & IEEE80211_RATE_VAL; 738 } 739 740 struct ieee80211_node * 741 ieee80211_node_alloc(struct ieee80211com *ic) 742 { 743 return malloc(sizeof(struct ieee80211_node), M_DEVBUF, 744 M_NOWAIT | M_ZERO); 745 } 746 747 void 748 ieee80211_node_cleanup(struct ieee80211com *ic, struct ieee80211_node *ni) 749 { 750 if (ni->ni_rsnie != NULL) { 751 free(ni->ni_rsnie, M_DEVBUF, 0); 752 ni->ni_rsnie = NULL; 753 } 754 ieee80211_ba_del(ni); 755 } 756 757 void 758 ieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni) 759 { 760 ieee80211_node_cleanup(ic, ni); 761 free(ni, M_DEVBUF, 0); 762 } 763 764 void 765 ieee80211_node_copy(struct ieee80211com *ic, 766 struct ieee80211_node *dst, const struct ieee80211_node *src) 767 { 768 ieee80211_node_cleanup(ic, dst); 769 *dst = *src; 770 dst->ni_rsnie = NULL; 771 if (src->ni_rsnie != NULL) 772 ieee80211_save_ie(src->ni_rsnie, &dst->ni_rsnie); 773 } 774 775 u_int8_t 776 ieee80211_node_getrssi(struct ieee80211com *ic, 777 const struct ieee80211_node *ni) 778 { 779 return ni->ni_rssi; 780 } 781 782 void 783 ieee80211_setup_node(struct ieee80211com *ic, 784 struct ieee80211_node *ni, const u_int8_t *macaddr) 785 { 786 int s; 787 788 DPRINTF(("%s\n", ether_sprintf((u_int8_t *)macaddr))); 789 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 790 ieee80211_node_newstate(ni, IEEE80211_STA_CACHE); 791 792 ni->ni_ic = ic; /* back-pointer */ 793 #ifndef IEEE80211_STA_ONLY 794 mq_init(&ni->ni_savedq, IEEE80211_PS_MAX_QUEUE, IPL_NET); 795 timeout_set(&ni->ni_eapol_to, ieee80211_eapol_timeout, ni); 796 timeout_set(&ni->ni_sa_query_to, ieee80211_sa_query_timeout, ni); 797 #endif 798 s = splnet(); 799 RB_INSERT(ieee80211_tree, &ic->ic_tree, ni); 800 ic->ic_nnodes++; 801 splx(s); 802 } 803 804 struct ieee80211_node * 805 ieee80211_alloc_node(struct ieee80211com *ic, const u_int8_t *macaddr) 806 { 807 struct ieee80211_node *ni = ieee80211_alloc_node_helper(ic); 808 if (ni != NULL) 809 ieee80211_setup_node(ic, ni, macaddr); 810 else 811 ic->ic_stats.is_rx_nodealloc++; 812 return ni; 813 } 814 815 struct ieee80211_node * 816 ieee80211_dup_bss(struct ieee80211com *ic, const u_int8_t *macaddr) 817 { 818 struct ieee80211_node *ni = ieee80211_alloc_node_helper(ic); 819 if (ni != NULL) { 820 ieee80211_setup_node(ic, ni, macaddr); 821 /* 822 * Inherit from ic_bss. 823 */ 824 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); 825 ni->ni_chan = ic->ic_bss->ni_chan; 826 } else 827 ic->ic_stats.is_rx_nodealloc++; 828 return ni; 829 } 830 831 struct ieee80211_node * 832 ieee80211_find_node(struct ieee80211com *ic, const u_int8_t *macaddr) 833 { 834 struct ieee80211_node *ni; 835 int cmp; 836 837 /* similar to RB_FIND except we compare keys, not nodes */ 838 ni = RB_ROOT(&ic->ic_tree); 839 while (ni != NULL) { 840 cmp = memcmp(macaddr, ni->ni_macaddr, IEEE80211_ADDR_LEN); 841 if (cmp < 0) 842 ni = RB_LEFT(ni, ni_node); 843 else if (cmp > 0) 844 ni = RB_RIGHT(ni, ni_node); 845 else 846 break; 847 } 848 return ni; 849 } 850 851 /* 852 * Return a reference to the appropriate node for sending 853 * a data frame. This handles node discovery in adhoc networks. 854 * 855 * Drivers will call this, so increase the reference count before 856 * returning the node. 857 */ 858 struct ieee80211_node * 859 ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr) 860 { 861 #ifndef IEEE80211_STA_ONLY 862 struct ieee80211_node *ni; 863 int s; 864 #endif 865 866 /* 867 * The destination address should be in the node table 868 * unless we are operating in station mode or this is a 869 * multicast/broadcast frame. 870 */ 871 if (ic->ic_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(macaddr)) 872 return ieee80211_ref_node(ic->ic_bss); 873 874 #ifndef IEEE80211_STA_ONLY 875 s = splnet(); 876 ni = ieee80211_find_node(ic, macaddr); 877 splx(s); 878 if (ni == NULL) { 879 if (ic->ic_opmode != IEEE80211_M_IBSS && 880 ic->ic_opmode != IEEE80211_M_AHDEMO) 881 return NULL; 882 883 /* 884 * Fake up a node; this handles node discovery in 885 * adhoc mode. Note that for the driver's benefit 886 * we we treat this like an association so the driver 887 * has an opportunity to setup its private state. 888 * 889 * XXX need better way to handle this; issue probe 890 * request so we can deduce rate set, etc. 891 */ 892 if ((ni = ieee80211_dup_bss(ic, macaddr)) == NULL) 893 return NULL; 894 /* XXX no rate negotiation; just dup */ 895 ni->ni_rates = ic->ic_bss->ni_rates; 896 ni->ni_txrate = 0; 897 if (ic->ic_newassoc) 898 (*ic->ic_newassoc)(ic, ni, 1); 899 } 900 return ieee80211_ref_node(ni); 901 #else 902 return NULL; /* can't get there */ 903 #endif /* IEEE80211_STA_ONLY */ 904 } 905 906 /* 907 * It is usually desirable to process a Rx packet using its sender's 908 * node-record instead of the BSS record. 909 * 910 * - AP mode: keep a node-record for every authenticated/associated 911 * station *in the BSS*. For future use, we also track neighboring 912 * APs, since they might belong to the same ESS. APs in the same 913 * ESS may bridge packets to each other, forming a Wireless 914 * Distribution System (WDS). 915 * 916 * - IBSS mode: keep a node-record for every station *in the BSS*. 917 * Also track neighboring stations by their beacons/probe responses. 918 * 919 * - monitor mode: keep a node-record for every sender, regardless 920 * of BSS. 921 * 922 * - STA mode: the only available node-record is the BSS record, 923 * ic->ic_bss. 924 * 925 * Of all the 802.11 Control packets, only the node-records for 926 * RTS packets node-record can be looked up. 927 * 928 * Return non-zero if the packet's node-record is kept, zero 929 * otherwise. 930 */ 931 static __inline int 932 ieee80211_needs_rxnode(struct ieee80211com *ic, 933 const struct ieee80211_frame *wh, const u_int8_t **bssid) 934 { 935 int monitor, rc = 0; 936 937 monitor = (ic->ic_opmode == IEEE80211_M_MONITOR); 938 939 *bssid = NULL; 940 941 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) { 942 case IEEE80211_FC0_TYPE_CTL: 943 if (!monitor) 944 break; 945 return (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == 946 IEEE80211_FC0_SUBTYPE_RTS; 947 case IEEE80211_FC0_TYPE_MGT: 948 *bssid = wh->i_addr3; 949 switch (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) { 950 case IEEE80211_FC0_SUBTYPE_BEACON: 951 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 952 break; 953 default: 954 #ifndef IEEE80211_STA_ONLY 955 if (ic->ic_opmode == IEEE80211_M_STA) 956 break; 957 rc = IEEE80211_ADDR_EQ(*bssid, ic->ic_bss->ni_bssid) || 958 IEEE80211_ADDR_EQ(*bssid, etherbroadcastaddr); 959 #endif 960 break; 961 } 962 break; 963 case IEEE80211_FC0_TYPE_DATA: 964 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 965 case IEEE80211_FC1_DIR_NODS: 966 *bssid = wh->i_addr3; 967 #ifndef IEEE80211_STA_ONLY 968 if (ic->ic_opmode == IEEE80211_M_IBSS || 969 ic->ic_opmode == IEEE80211_M_AHDEMO) 970 rc = IEEE80211_ADDR_EQ(*bssid, 971 ic->ic_bss->ni_bssid); 972 #endif 973 break; 974 case IEEE80211_FC1_DIR_TODS: 975 *bssid = wh->i_addr1; 976 #ifndef IEEE80211_STA_ONLY 977 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 978 rc = IEEE80211_ADDR_EQ(*bssid, 979 ic->ic_bss->ni_bssid); 980 #endif 981 break; 982 case IEEE80211_FC1_DIR_FROMDS: 983 case IEEE80211_FC1_DIR_DSTODS: 984 *bssid = wh->i_addr2; 985 #ifndef IEEE80211_STA_ONLY 986 rc = (ic->ic_opmode == IEEE80211_M_HOSTAP); 987 #endif 988 break; 989 } 990 break; 991 } 992 return monitor || rc; 993 } 994 995 /* 996 * Drivers call this, so increase the reference count before returning 997 * the node. 998 */ 999 struct ieee80211_node * 1000 ieee80211_find_rxnode(struct ieee80211com *ic, 1001 const struct ieee80211_frame *wh) 1002 { 1003 static const u_int8_t zero[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; 1004 struct ieee80211_node *ni; 1005 const u_int8_t *bssid; 1006 int s; 1007 1008 if (!ieee80211_needs_rxnode(ic, wh, &bssid)) 1009 return ieee80211_ref_node(ic->ic_bss); 1010 1011 s = splnet(); 1012 ni = ieee80211_find_node(ic, wh->i_addr2); 1013 splx(s); 1014 1015 if (ni != NULL) 1016 return ieee80211_ref_node(ni); 1017 #ifndef IEEE80211_STA_ONLY 1018 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 1019 return ieee80211_ref_node(ic->ic_bss); 1020 #endif 1021 /* XXX see remarks in ieee80211_find_txnode */ 1022 /* XXX no rate negotiation; just dup */ 1023 if ((ni = ieee80211_dup_bss(ic, wh->i_addr2)) == NULL) 1024 return ieee80211_ref_node(ic->ic_bss); 1025 1026 IEEE80211_ADDR_COPY(ni->ni_bssid, (bssid != NULL) ? bssid : zero); 1027 1028 ni->ni_rates = ic->ic_bss->ni_rates; 1029 ni->ni_txrate = 0; 1030 if (ic->ic_newassoc) 1031 (*ic->ic_newassoc)(ic, ni, 1); 1032 1033 DPRINTF(("faked-up node %p for %s\n", ni, 1034 ether_sprintf((u_int8_t *)wh->i_addr2))); 1035 1036 return ieee80211_ref_node(ni); 1037 } 1038 1039 struct ieee80211_node * 1040 ieee80211_find_node_for_beacon(struct ieee80211com *ic, 1041 const u_int8_t *macaddr, const struct ieee80211_channel *chan, 1042 const char *ssid, u_int8_t rssi) 1043 { 1044 struct ieee80211_node *ni, *keep = NULL; 1045 int s, score = 0; 1046 1047 if ((ni = ieee80211_find_node(ic, macaddr)) != NULL) { 1048 s = splnet(); 1049 1050 if (ni->ni_chan != chan && ni->ni_rssi >= rssi) 1051 score++; 1052 if (ssid[1] == 0 && ni->ni_esslen != 0) 1053 score++; 1054 if (score > 0) 1055 keep = ni; 1056 1057 splx(s); 1058 } 1059 1060 return (keep); 1061 } 1062 1063 void 1064 ieee80211_ba_del(struct ieee80211_node *ni) 1065 { 1066 int tid; 1067 1068 for (tid = 0; tid < nitems(ni->ni_rx_ba); tid++) { 1069 struct ieee80211_rx_ba *ba = &ni->ni_rx_ba[tid]; 1070 if (ba->ba_state != IEEE80211_BA_INIT) { 1071 if (timeout_pending(&ba->ba_to)) 1072 timeout_del(&ba->ba_to); 1073 if (timeout_pending(&ba->ba_gap_to)) 1074 timeout_del(&ba->ba_gap_to); 1075 ba->ba_state = IEEE80211_BA_INIT; 1076 } 1077 } 1078 1079 for (tid = 0; tid < nitems(ni->ni_tx_ba); tid++) { 1080 struct ieee80211_tx_ba *ba = &ni->ni_tx_ba[tid]; 1081 if (ba->ba_state != IEEE80211_BA_INIT) { 1082 if (timeout_pending(&ba->ba_to)) 1083 timeout_del(&ba->ba_to); 1084 ba->ba_state = IEEE80211_BA_INIT; 1085 } 1086 } 1087 } 1088 1089 void 1090 ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 1091 { 1092 if (ni == ic->ic_bss) 1093 panic("freeing bss node"); 1094 1095 splassert(IPL_NET); 1096 1097 DPRINTF(("%s\n", ether_sprintf(ni->ni_macaddr))); 1098 #ifndef IEEE80211_STA_ONLY 1099 timeout_del(&ni->ni_eapol_to); 1100 timeout_del(&ni->ni_sa_query_to); 1101 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1102 #endif 1103 ieee80211_ba_del(ni); 1104 RB_REMOVE(ieee80211_tree, &ic->ic_tree, ni); 1105 ic->ic_nnodes--; 1106 #ifndef IEEE80211_STA_ONLY 1107 if (mq_purge(&ni->ni_savedq) > 0) { 1108 if (ic->ic_set_tim != NULL) 1109 (*ic->ic_set_tim)(ic, ni->ni_associd, 0); 1110 } 1111 #endif 1112 (*ic->ic_node_free)(ic, ni); 1113 /* TBD indicate to drivers that a new node can be allocated */ 1114 } 1115 1116 void 1117 ieee80211_release_node(struct ieee80211com *ic, struct ieee80211_node *ni) 1118 { 1119 int s; 1120 1121 DPRINTF(("%s refcnt %u\n", ether_sprintf(ni->ni_macaddr), 1122 ni->ni_refcnt)); 1123 s = splnet(); 1124 if (ieee80211_node_decref(ni) == 0 && 1125 ni->ni_state == IEEE80211_STA_COLLECT) { 1126 ieee80211_free_node(ic, ni); 1127 } 1128 splx(s); 1129 } 1130 1131 void 1132 ieee80211_free_allnodes(struct ieee80211com *ic) 1133 { 1134 struct ieee80211_node *ni; 1135 int s; 1136 1137 DPRINTF(("freeing all nodes\n")); 1138 s = splnet(); 1139 while ((ni = RB_MIN(ieee80211_tree, &ic->ic_tree)) != NULL) 1140 ieee80211_free_node(ic, ni); 1141 splx(s); 1142 1143 if (ic->ic_bss != NULL) 1144 ieee80211_node_cleanup(ic, ic->ic_bss); /* for station mode */ 1145 } 1146 1147 void 1148 ieee80211_clean_cached(struct ieee80211com *ic) 1149 { 1150 struct ieee80211_node *ni, *next_ni; 1151 int s; 1152 1153 s = splnet(); 1154 for (ni = RB_MIN(ieee80211_tree, &ic->ic_tree); 1155 ni != NULL; ni = next_ni) { 1156 next_ni = RB_NEXT(ieee80211_tree, &ic->ic_tree, ni); 1157 if (ni->ni_state == IEEE80211_STA_CACHE) 1158 ieee80211_free_node(ic, ni); 1159 } 1160 splx(s); 1161 } 1162 /* 1163 * Timeout inactive nodes. 1164 * 1165 * If called because of a cache timeout, which happens only in hostap and ibss 1166 * modes, clean all inactive cached or authenticated nodes but don't de-auth 1167 * any associated nodes. 1168 * 1169 * Else, this function is called because a new node must be allocated but the 1170 * node cache is full. In this case, return as soon as a free slot was made 1171 * available. If acting as hostap, clean cached nodes regardless of their 1172 * recent activity and also allow de-authing of authenticated nodes older 1173 * than one cache wait interval, and de-authing of inactive associated nodes. 1174 */ 1175 void 1176 ieee80211_clean_nodes(struct ieee80211com *ic, int cache_timeout) 1177 { 1178 struct ieee80211_node *ni, *next_ni; 1179 u_int gen = ic->ic_scangen++; /* NB: ok 'cuz single-threaded*/ 1180 int s; 1181 #ifndef IEEE80211_STA_ONLY 1182 int nnodes = 0; 1183 struct ifnet *ifp = &ic->ic_if; 1184 #endif 1185 1186 s = splnet(); 1187 for (ni = RB_MIN(ieee80211_tree, &ic->ic_tree); 1188 ni != NULL; ni = next_ni) { 1189 next_ni = RB_NEXT(ieee80211_tree, &ic->ic_tree, ni); 1190 if (!cache_timeout && ic->ic_nnodes < ic->ic_max_nnodes) 1191 break; 1192 if (ni->ni_scangen == gen) /* previously handled */ 1193 continue; 1194 #ifndef IEEE80211_STA_ONLY 1195 nnodes++; 1196 #endif 1197 ni->ni_scangen = gen; 1198 if (ni->ni_refcnt > 0) 1199 continue; 1200 #ifndef IEEE80211_STA_ONLY 1201 if ((ic->ic_opmode == IEEE80211_M_HOSTAP || 1202 ic->ic_opmode == IEEE80211_M_IBSS) && 1203 ic->ic_state == IEEE80211_S_RUN) { 1204 if (cache_timeout) { 1205 if (ni->ni_state != IEEE80211_STA_COLLECT && 1206 (ni->ni_state == IEEE80211_STA_ASSOC || 1207 ni->ni_inact < IEEE80211_INACT_MAX)) 1208 continue; 1209 } else { 1210 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 1211 ((ni->ni_state == IEEE80211_STA_ASSOC && 1212 ni->ni_inact < IEEE80211_INACT_MAX) || 1213 (ni->ni_state == IEEE80211_STA_AUTH && 1214 ni->ni_inact == 0))) 1215 continue; 1216 1217 if (ic->ic_opmode == IEEE80211_M_IBSS && 1218 ni->ni_state != IEEE80211_STA_COLLECT && 1219 ni->ni_state != IEEE80211_STA_CACHE && 1220 ni->ni_inact < IEEE80211_INACT_MAX) 1221 continue; 1222 } 1223 } 1224 if (ifp->if_flags & IFF_DEBUG) 1225 printf("%s: station %s purged from node cache\n", 1226 ifp->if_xname, ether_sprintf(ni->ni_macaddr)); 1227 #endif 1228 /* 1229 * If we're hostap and the node is authenticated, send 1230 * a deauthentication frame. The node will be freed when 1231 * the driver calls ieee80211_release_node(). 1232 */ 1233 #ifndef IEEE80211_STA_ONLY 1234 nnodes--; 1235 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 1236 ni->ni_state >= IEEE80211_STA_AUTH && 1237 ni->ni_state != IEEE80211_STA_COLLECT) { 1238 splx(s); 1239 IEEE80211_SEND_MGMT(ic, ni, 1240 IEEE80211_FC0_SUBTYPE_DEAUTH, 1241 IEEE80211_REASON_AUTH_EXPIRE); 1242 s = splnet(); 1243 ieee80211_node_leave(ic, ni); 1244 } else 1245 #endif 1246 ieee80211_free_node(ic, ni); 1247 ic->ic_stats.is_node_timeout++; 1248 } 1249 1250 #ifndef IEEE80211_STA_ONLY 1251 /* 1252 * During a cache timeout we iterate over all nodes. 1253 * Check for node leaks by comparing the actual number of cached 1254 * nodes with the ic_nnodes count, which is maintained while adding 1255 * and removing nodes from the cache. 1256 */ 1257 if ((ifp->if_flags & IFF_DEBUG) && cache_timeout && 1258 nnodes != ic->ic_nnodes) 1259 printf("%s: number of cached nodes is %d, expected %d," 1260 "possible nodes leak\n", ifp->if_xname, nnodes, 1261 ic->ic_nnodes); 1262 #endif 1263 splx(s); 1264 } 1265 1266 void 1267 ieee80211_iterate_nodes(struct ieee80211com *ic, ieee80211_iter_func *f, 1268 void *arg) 1269 { 1270 struct ieee80211_node *ni; 1271 int s; 1272 1273 s = splnet(); 1274 RB_FOREACH(ni, ieee80211_tree, &ic->ic_tree) 1275 (*f)(arg, ni); 1276 splx(s); 1277 } 1278 1279 1280 /* 1281 * Install received HT caps information in the node's state block. 1282 */ 1283 void 1284 ieee80211_setup_htcaps(struct ieee80211_node *ni, const uint8_t *data, 1285 uint8_t len) 1286 { 1287 uint16_t rxrate; 1288 1289 if (len != 26) 1290 return; 1291 1292 ni->ni_htcaps = (data[0] | (data[1] << 8)); 1293 ni->ni_ampdu_param = data[2]; 1294 1295 memcpy(ni->ni_rxmcs, &data[3], sizeof(ni->ni_rxmcs)); 1296 /* clear reserved bits */ 1297 clrbit(ni->ni_rxmcs, 77); 1298 clrbit(ni->ni_rxmcs, 78); 1299 clrbit(ni->ni_rxmcs, 79); 1300 1301 /* Max MCS Rx rate in 1Mb/s units (0 means "not specified"). */ 1302 rxrate = ((data[13] | (data[14]) << 8) & IEEE80211_MCS_RX_RATE_HIGH); 1303 if (rxrate < 1024) 1304 ni->ni_max_rxrate = rxrate; 1305 1306 ni->ni_tx_mcs_set = data[15]; 1307 ni->ni_htxcaps = (data[19] | (data[20] << 8)); 1308 ni->ni_txbfcaps = (data[21] | (data[22] << 8) | (data[23] << 16) | 1309 (data[24] << 24)); 1310 ni->ni_aselcaps = data[25]; 1311 } 1312 1313 /* 1314 * Install received HT op information in the node's state block. 1315 */ 1316 int 1317 ieee80211_setup_htop(struct ieee80211_node *ni, const uint8_t *data, 1318 uint8_t len) 1319 { 1320 if (len != 22) 1321 return 0; 1322 1323 ni->ni_primary_chan = data[0]; /* XXX corresponds to ni_chan */ 1324 1325 ni->ni_htop0 = data[1]; 1326 ni->ni_htop1 = (data[2] | (data[3] << 8)); 1327 ni->ni_htop2 = (data[3] | (data[4] << 8)); 1328 1329 memcpy(ni->ni_basic_mcs, &data[6], sizeof(ni->ni_basic_mcs)); 1330 1331 return 1; 1332 } 1333 1334 /* 1335 * Install received rate set information in the node's state block. 1336 */ 1337 int 1338 ieee80211_setup_rates(struct ieee80211com *ic, struct ieee80211_node *ni, 1339 const u_int8_t *rates, const u_int8_t *xrates, int flags) 1340 { 1341 struct ieee80211_rateset *rs = &ni->ni_rates; 1342 1343 memset(rs, 0, sizeof(*rs)); 1344 rs->rs_nrates = rates[1]; 1345 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 1346 if (xrates != NULL) { 1347 u_int8_t nxrates; 1348 /* 1349 * Tack on 11g extended supported rate element. 1350 */ 1351 nxrates = xrates[1]; 1352 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 1353 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 1354 DPRINTF(("extended rate set too large; " 1355 "only using %u of %u rates\n", 1356 nxrates, xrates[1])); 1357 ic->ic_stats.is_rx_rstoobig++; 1358 } 1359 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 1360 rs->rs_nrates += nxrates; 1361 } 1362 return ieee80211_fix_rate(ic, ni, flags); 1363 } 1364 1365 #ifndef IEEE80211_STA_ONLY 1366 /* 1367 * Check if the specified node supports ERP. 1368 */ 1369 int 1370 ieee80211_iserp_sta(const struct ieee80211_node *ni) 1371 { 1372 static const u_int8_t rates[] = { 2, 4, 11, 22, 12, 24, 48 }; 1373 const struct ieee80211_rateset *rs = &ni->ni_rates; 1374 int i, j; 1375 1376 /* 1377 * A STA supports ERP operation if it includes all the Clause 19 1378 * mandatory rates in its supported rate set. 1379 */ 1380 for (i = 0; i < nitems(rates); i++) { 1381 for (j = 0; j < rs->rs_nrates; j++) { 1382 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == rates[i]) 1383 break; 1384 } 1385 if (j == rs->rs_nrates) 1386 return 0; 1387 } 1388 return 1; 1389 } 1390 1391 /* 1392 * This function is called to notify the 802.1X PACP machine that a new 1393 * 802.1X port is enabled and must be authenticated. For 802.11, a port 1394 * becomes enabled whenever a STA successfully completes Open System 1395 * authentication with an AP. 1396 */ 1397 void 1398 ieee80211_needs_auth(struct ieee80211com *ic, struct ieee80211_node *ni) 1399 { 1400 /* 1401 * XXX this could be done via the route socket of via a dedicated 1402 * EAP socket or another kernel->userland notification mechanism. 1403 * The notification should include the MAC address (ni_macaddr). 1404 */ 1405 } 1406 1407 /* 1408 * Handle an HT STA joining an HT network. 1409 */ 1410 void 1411 ieee80211_node_join_ht(struct ieee80211com *ic, struct ieee80211_node *ni) 1412 { 1413 /* TBD */ 1414 } 1415 1416 /* 1417 * Handle a station joining an RSN network. 1418 */ 1419 void 1420 ieee80211_node_join_rsn(struct ieee80211com *ic, struct ieee80211_node *ni) 1421 { 1422 DPRINTF(("station %s associated using proto %d akm 0x%x " 1423 "cipher 0x%x groupcipher 0x%x\n", ether_sprintf(ni->ni_macaddr), 1424 ni->ni_rsnprotos, ni->ni_rsnakms, ni->ni_rsnciphers, 1425 ni->ni_rsngroupcipher)); 1426 1427 ni->ni_rsn_state = RSNA_AUTHENTICATION; 1428 ic->ic_rsnsta++; 1429 1430 ni->ni_key_count = 0; 1431 ni->ni_port_valid = 0; 1432 ni->ni_flags &= ~IEEE80211_NODE_TXRXPROT; 1433 ni->ni_replaycnt = -1; /* XXX */ 1434 ni->ni_rsn_retries = 0; 1435 ni->ni_rsncipher = ni->ni_rsnciphers; 1436 1437 ni->ni_rsn_state = RSNA_AUTHENTICATION_2; 1438 1439 /* generate a new authenticator nonce (ANonce) */ 1440 arc4random_buf(ni->ni_nonce, EAPOL_KEY_NONCE_LEN); 1441 1442 if (!ieee80211_is_8021x_akm(ni->ni_rsnakms)) { 1443 memcpy(ni->ni_pmk, ic->ic_psk, IEEE80211_PMK_LEN); 1444 ni->ni_flags |= IEEE80211_NODE_PMK; 1445 (void)ieee80211_send_4way_msg1(ic, ni); 1446 } else if (ni->ni_flags & IEEE80211_NODE_PMK) { 1447 /* skip 802.1X auth if a cached PMK was found */ 1448 (void)ieee80211_send_4way_msg1(ic, ni); 1449 } else { 1450 /* no cached PMK found, needs full 802.1X auth */ 1451 ieee80211_needs_auth(ic, ni); 1452 } 1453 } 1454 1455 /* 1456 * Handle a station joining an 11g network. 1457 */ 1458 void 1459 ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1460 { 1461 if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 1462 /* 1463 * Joining STA doesn't support short slot time. We must 1464 * disable the use of short slot time for all other associated 1465 * STAs and give the driver a chance to reconfigure the 1466 * hardware. 1467 */ 1468 if (++ic->ic_longslotsta == 1) { 1469 if (ic->ic_caps & IEEE80211_C_SHSLOT) 1470 ieee80211_set_shortslottime(ic, 0); 1471 } 1472 DPRINTF(("[%s] station needs long slot time, count %d\n", 1473 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta)); 1474 } 1475 1476 if (!ieee80211_iserp_sta(ni)) { 1477 /* 1478 * Joining STA is non-ERP. 1479 */ 1480 ic->ic_nonerpsta++; 1481 1482 DPRINTF(("[%s] station is non-ERP, %d non-ERP " 1483 "stations associated\n", ether_sprintf(ni->ni_macaddr), 1484 ic->ic_nonerpsta)); 1485 1486 /* must enable the use of protection */ 1487 if (ic->ic_protmode != IEEE80211_PROT_NONE) { 1488 DPRINTF(("enable use of protection\n")); 1489 ic->ic_flags |= IEEE80211_F_USEPROT; 1490 } 1491 1492 if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 1493 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1494 } else 1495 ni->ni_flags |= IEEE80211_NODE_ERP; 1496 } 1497 1498 void 1499 ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, 1500 int resp) 1501 { 1502 int newassoc = (ni->ni_state != IEEE80211_STA_ASSOC); 1503 1504 if (ni->ni_associd == 0) { 1505 u_int16_t aid; 1506 1507 /* 1508 * It would be clever to search the bitmap 1509 * more efficiently, but this will do for now. 1510 */ 1511 for (aid = 1; aid < ic->ic_max_aid; aid++) { 1512 if (!IEEE80211_AID_ISSET(aid, 1513 ic->ic_aid_bitmap)) 1514 break; 1515 } 1516 if (aid >= ic->ic_max_aid) { 1517 IEEE80211_SEND_MGMT(ic, ni, resp, 1518 IEEE80211_REASON_ASSOC_TOOMANY); 1519 ieee80211_node_leave(ic, ni); 1520 return; 1521 } 1522 ni->ni_associd = aid | 0xc000; 1523 IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap); 1524 if (ic->ic_curmode == IEEE80211_MODE_11G || 1525 (ic->ic_curmode == IEEE80211_MODE_11N && 1526 IEEE80211_IS_CHAN_2GHZ(ic->ic_bss->ni_chan))) 1527 ieee80211_node_join_11g(ic, ni); 1528 } 1529 1530 DPRINTF(("station %s %s associated at aid %d\n", 1531 ether_sprintf(ni->ni_macaddr), newassoc ? "newly" : "already", 1532 ni->ni_associd & ~0xc000)); 1533 1534 /* give driver a chance to setup state like ni_txrate */ 1535 if (ic->ic_newassoc) 1536 (*ic->ic_newassoc)(ic, ni, newassoc); 1537 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS); 1538 ieee80211_node_newstate(ni, IEEE80211_STA_ASSOC); 1539 1540 if (!(ic->ic_flags & IEEE80211_F_RSNON)) { 1541 ni->ni_port_valid = 1; 1542 ni->ni_rsncipher = IEEE80211_CIPHER_USEGROUP; 1543 } else 1544 ieee80211_node_join_rsn(ic, ni); 1545 1546 ieee80211_ht_negotiate(ic, ni); 1547 if (ni->ni_flags & IEEE80211_NODE_HT) 1548 ieee80211_node_join_ht(ic, ni); 1549 1550 #if NBRIDGE > 0 1551 /* 1552 * If the parent interface is a bridgeport, learn 1553 * the node's address dynamically on this interface. 1554 */ 1555 if (ic->ic_if.if_bridgeport != NULL) 1556 bridge_update(&ic->ic_if, 1557 (struct ether_addr *)ni->ni_macaddr, 0); 1558 #endif 1559 } 1560 1561 /* 1562 * Handle an HT STA leaving an HT network. 1563 */ 1564 void 1565 ieee80211_node_leave_ht(struct ieee80211com *ic, struct ieee80211_node *ni) 1566 { 1567 struct ieee80211_rx_ba *ba; 1568 u_int8_t tid; 1569 int i; 1570 1571 /* free all Block Ack records */ 1572 for (tid = 0; tid < IEEE80211_NUM_TID; tid++) { 1573 ba = &ni->ni_rx_ba[tid]; 1574 if (ba->ba_buf != NULL) { 1575 for (i = 0; i < IEEE80211_BA_MAX_WINSZ; i++) 1576 m_freem(ba->ba_buf[i].m); 1577 free(ba->ba_buf, M_DEVBUF, 0); 1578 ba->ba_buf = NULL; 1579 } 1580 } 1581 } 1582 1583 /* 1584 * Handle a station leaving an RSN network. 1585 */ 1586 void 1587 ieee80211_node_leave_rsn(struct ieee80211com *ic, struct ieee80211_node *ni) 1588 { 1589 ni->ni_rsn_state = RSNA_DISCONNECTED; 1590 ic->ic_rsnsta--; 1591 1592 ni->ni_rsn_state = RSNA_INITIALIZE; 1593 if ((ni->ni_flags & IEEE80211_NODE_REKEY) && 1594 --ic->ic_rsn_keydonesta == 0) 1595 ieee80211_setkeysdone(ic); 1596 ni->ni_flags &= ~IEEE80211_NODE_REKEY; 1597 1598 ni->ni_flags &= ~IEEE80211_NODE_PMK; 1599 ni->ni_rsn_gstate = RSNA_IDLE; 1600 1601 timeout_del(&ni->ni_eapol_to); 1602 timeout_del(&ni->ni_sa_query_to); 1603 1604 ni->ni_rsn_retries = 0; 1605 ni->ni_flags &= ~IEEE80211_NODE_TXRXPROT; 1606 ni->ni_port_valid = 0; 1607 (*ic->ic_delete_key)(ic, ni, &ni->ni_pairwise_key); 1608 } 1609 1610 /* 1611 * Handle a station leaving an 11g network. 1612 */ 1613 void 1614 ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1615 { 1616 if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 1617 #ifdef DIAGNOSTIC 1618 if (ic->ic_longslotsta == 0) { 1619 panic("bogus long slot station count %d", 1620 ic->ic_longslotsta); 1621 } 1622 #endif 1623 /* leaving STA did not support short slot time */ 1624 if (--ic->ic_longslotsta == 0) { 1625 /* 1626 * All associated STAs now support short slot time, so 1627 * enable this feature and give the driver a chance to 1628 * reconfigure the hardware. Notice that IBSS always 1629 * use a long slot time. 1630 */ 1631 if ((ic->ic_caps & IEEE80211_C_SHSLOT) && 1632 ic->ic_opmode != IEEE80211_M_IBSS) 1633 ieee80211_set_shortslottime(ic, 1); 1634 } 1635 DPRINTF(("[%s] long slot time station leaves, count %d\n", 1636 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta)); 1637 } 1638 1639 if (!(ni->ni_flags & IEEE80211_NODE_ERP)) { 1640 #ifdef DIAGNOSTIC 1641 if (ic->ic_nonerpsta == 0) { 1642 panic("bogus non-ERP station count %d", 1643 ic->ic_nonerpsta); 1644 } 1645 #endif 1646 /* leaving STA was non-ERP */ 1647 if (--ic->ic_nonerpsta == 0) { 1648 /* 1649 * All associated STAs are now ERP capable, disable use 1650 * of protection and re-enable short preamble support. 1651 */ 1652 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1653 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 1654 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1655 } 1656 DPRINTF(("[%s] non-ERP station leaves, count %d\n", 1657 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta)); 1658 } 1659 } 1660 1661 /* 1662 * Handle bookkeeping for station deauthentication/disassociation 1663 * when operating as an ap. 1664 */ 1665 void 1666 ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 1667 { 1668 if (ic->ic_opmode != IEEE80211_M_HOSTAP) 1669 panic("not in ap mode, mode %u", ic->ic_opmode); 1670 /* 1671 * If node wasn't previously associated all we need to do is 1672 * reclaim the reference. 1673 */ 1674 if (ni->ni_associd == 0) { 1675 ieee80211_node_newstate(ni, IEEE80211_STA_COLLECT); 1676 return; 1677 } 1678 1679 if (ni->ni_pwrsave == IEEE80211_PS_DOZE) { 1680 ic->ic_pssta--; 1681 ni->ni_pwrsave = IEEE80211_PS_AWAKE; 1682 } 1683 1684 if (mq_purge(&ni->ni_savedq) > 0) { 1685 if (ic->ic_set_tim != NULL) 1686 (*ic->ic_set_tim)(ic, ni->ni_associd, 0); 1687 } 1688 1689 if (ic->ic_flags & IEEE80211_F_RSNON) 1690 ieee80211_node_leave_rsn(ic, ni); 1691 1692 if (ic->ic_curmode == IEEE80211_MODE_11G || 1693 (ic->ic_curmode == IEEE80211_MODE_11N && 1694 IEEE80211_IS_CHAN_2GHZ(ic->ic_bss->ni_chan))) 1695 ieee80211_node_leave_11g(ic, ni); 1696 1697 if (ni->ni_flags & IEEE80211_NODE_HT) 1698 ieee80211_node_leave_ht(ic, ni); 1699 1700 if (ic->ic_node_leave != NULL) 1701 (*ic->ic_node_leave)(ic, ni); 1702 1703 ieee80211_node_newstate(ni, IEEE80211_STA_COLLECT); 1704 1705 #if NBRIDGE > 0 1706 /* 1707 * If the parent interface is a bridgeport, delete 1708 * any dynamically learned address for this node. 1709 */ 1710 if (ic->ic_if.if_bridgeport != NULL) 1711 bridge_update(&ic->ic_if, 1712 (struct ether_addr *)ni->ni_macaddr, 1); 1713 #endif 1714 } 1715 1716 static int 1717 ieee80211_do_slow_print(struct ieee80211com *ic, int *did_print) 1718 { 1719 static const struct timeval merge_print_intvl = { 1720 .tv_sec = 1, .tv_usec = 0 1721 }; 1722 if ((ic->ic_if.if_flags & IFF_LINK0) == 0) 1723 return 0; 1724 if (!*did_print && (ic->ic_if.if_flags & IFF_DEBUG) == 0 && 1725 !ratecheck(&ic->ic_last_merge_print, &merge_print_intvl)) 1726 return 0; 1727 1728 *did_print = 1; 1729 return 1; 1730 } 1731 1732 /* ieee80211_ibss_merge helps merge 802.11 ad hoc networks. The 1733 * convention, set by the Wireless Ethernet Compatibility Alliance 1734 * (WECA), is that an 802.11 station will change its BSSID to match 1735 * the "oldest" 802.11 ad hoc network, on the same channel, that 1736 * has the station's desired SSID. The "oldest" 802.11 network 1737 * sends beacons with the greatest TSF timestamp. 1738 * 1739 * Return ENETRESET if the BSSID changed, 0 otherwise. 1740 * 1741 * XXX Perhaps we should compensate for the time that elapses 1742 * between the MAC receiving the beacon and the host processing it 1743 * in ieee80211_ibss_merge. 1744 */ 1745 int 1746 ieee80211_ibss_merge(struct ieee80211com *ic, struct ieee80211_node *ni, 1747 u_int64_t local_tsft) 1748 { 1749 u_int64_t beacon_tsft; 1750 int did_print = 0, sign; 1751 union { 1752 u_int64_t word; 1753 u_int8_t tstamp[8]; 1754 } u; 1755 1756 /* ensure alignment */ 1757 (void)memcpy(&u, &ni->ni_tstamp[0], sizeof(u)); 1758 beacon_tsft = letoh64(u.word); 1759 1760 /* we are faster, let the other guy catch up */ 1761 if (beacon_tsft < local_tsft) 1762 sign = -1; 1763 else 1764 sign = 1; 1765 1766 if (IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) { 1767 if (!ieee80211_do_slow_print(ic, &did_print)) 1768 return 0; 1769 printf("%s: tsft offset %s%llu\n", ic->ic_if.if_xname, 1770 (sign < 0) ? "-" : "", 1771 (sign < 0) 1772 ? (local_tsft - beacon_tsft) 1773 : (beacon_tsft - local_tsft)); 1774 return 0; 1775 } 1776 1777 if (sign < 0) 1778 return 0; 1779 1780 if (ieee80211_match_bss(ic, ni) != 0) 1781 return 0; 1782 1783 if (ieee80211_do_slow_print(ic, &did_print)) { 1784 printf("%s: ieee80211_ibss_merge: bssid mismatch %s\n", 1785 ic->ic_if.if_xname, ether_sprintf(ni->ni_bssid)); 1786 printf("%s: my tsft %llu beacon tsft %llu\n", 1787 ic->ic_if.if_xname, local_tsft, beacon_tsft); 1788 printf("%s: sync TSF with %s\n", 1789 ic->ic_if.if_xname, ether_sprintf(ni->ni_macaddr)); 1790 } 1791 1792 ic->ic_flags &= ~IEEE80211_F_SIBSS; 1793 1794 /* negotiate rates with new IBSS */ 1795 ieee80211_fix_rate(ic, ni, IEEE80211_F_DOFRATE | 1796 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1797 if (ni->ni_rates.rs_nrates == 0) { 1798 if (ieee80211_do_slow_print(ic, &did_print)) { 1799 printf("%s: rates mismatch, BSSID %s\n", 1800 ic->ic_if.if_xname, ether_sprintf(ni->ni_bssid)); 1801 } 1802 return 0; 1803 } 1804 1805 if (ieee80211_do_slow_print(ic, &did_print)) { 1806 printf("%s: sync BSSID %s -> ", 1807 ic->ic_if.if_xname, ether_sprintf(ic->ic_bss->ni_bssid)); 1808 printf("%s ", ether_sprintf(ni->ni_bssid)); 1809 printf("(from %s)\n", ether_sprintf(ni->ni_macaddr)); 1810 } 1811 1812 ieee80211_node_newstate(ni, IEEE80211_STA_BSS); 1813 (*ic->ic_node_copy)(ic, ic->ic_bss, ni); 1814 1815 return ENETRESET; 1816 } 1817 1818 void 1819 ieee80211_set_tim(struct ieee80211com *ic, int aid, int set) 1820 { 1821 if (set) 1822 setbit(ic->ic_tim_bitmap, aid & ~0xc000); 1823 else 1824 clrbit(ic->ic_tim_bitmap, aid & ~0xc000); 1825 } 1826 1827 /* 1828 * This function shall be called by drivers immediately after every DTIM. 1829 * Transmit all group addressed MSDUs buffered at the AP. 1830 */ 1831 void 1832 ieee80211_notify_dtim(struct ieee80211com *ic) 1833 { 1834 /* NB: group addressed MSDUs are buffered in ic_bss */ 1835 struct ieee80211_node *ni = ic->ic_bss; 1836 struct ifnet *ifp = &ic->ic_if; 1837 struct ieee80211_frame *wh; 1838 struct mbuf *m; 1839 1840 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP); 1841 1842 while ((m = mq_dequeue(&ni->ni_savedq)) != NULL) { 1843 if (!mq_empty(&ni->ni_savedq)) { 1844 /* more queued frames, set the more data bit */ 1845 wh = mtod(m, struct ieee80211_frame *); 1846 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1847 } 1848 mq_enqueue(&ic->ic_pwrsaveq, m); 1849 if_start(ifp); 1850 } 1851 /* XXX assumes everything has been sent */ 1852 ic->ic_tim_mcast_pending = 0; 1853 } 1854 #endif /* IEEE80211_STA_ONLY */ 1855 1856 /* 1857 * Compare nodes in the tree by lladdr 1858 */ 1859 int 1860 ieee80211_node_cmp(const struct ieee80211_node *b1, 1861 const struct ieee80211_node *b2) 1862 { 1863 return (memcmp(b1->ni_macaddr, b2->ni_macaddr, IEEE80211_ADDR_LEN)); 1864 } 1865 1866 /* 1867 * Generate red-black tree function logic 1868 */ 1869 RB_GENERATE(ieee80211_tree, ieee80211_node, ni_node, ieee80211_node_cmp); 1870