1 /* $OpenBSD: ieee80211_node.c,v 1.115 2017/03/04 12:44:27 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 = RBT_MIN(ieee80211_tree, &ic->ic_tree); 96 ni != NULL; ni = next_ni) { 97 next_ni = RBT_NEXT(ieee80211_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 RBT_INIT(ieee80211_tree, &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 timeout_del(&ic->ic_tkip_micfail_timeout); 212 #endif 213 timeout_del(&ic->ic_rsn_timeout); 214 } 215 216 /* 217 * AP scanning support. 218 */ 219 220 /* 221 * Initialize the active channel set based on the set 222 * of available channels and the current PHY mode. 223 */ 224 void 225 ieee80211_reset_scan(struct ifnet *ifp) 226 { 227 struct ieee80211com *ic = (void *)ifp; 228 229 memcpy(ic->ic_chan_scan, ic->ic_chan_active, 230 sizeof(ic->ic_chan_active)); 231 /* NB: hack, setup so next_scan starts with the first channel */ 232 if (ic->ic_bss != NULL && ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC) 233 ic->ic_bss->ni_chan = &ic->ic_channels[IEEE80211_CHAN_MAX]; 234 } 235 236 /* 237 * Begin an active scan. 238 */ 239 void 240 ieee80211_begin_scan(struct ifnet *ifp) 241 { 242 struct ieee80211com *ic = (void *)ifp; 243 244 if (ic->ic_scan_lock & IEEE80211_SCAN_LOCKED) 245 return; 246 ic->ic_scan_lock |= IEEE80211_SCAN_LOCKED; 247 248 /* 249 * In all but hostap mode scanning starts off in 250 * an active mode before switching to passive. 251 */ 252 #ifndef IEEE80211_STA_ONLY 253 if (ic->ic_opmode != IEEE80211_M_HOSTAP) 254 #endif 255 { 256 ic->ic_flags |= IEEE80211_F_ASCAN; 257 ic->ic_stats.is_scan_active++; 258 } 259 #ifndef IEEE80211_STA_ONLY 260 else 261 ic->ic_stats.is_scan_passive++; 262 #endif 263 if (ifp->if_flags & IFF_DEBUG) 264 printf("%s: begin %s scan\n", ifp->if_xname, 265 (ic->ic_flags & IEEE80211_F_ASCAN) ? 266 "active" : "passive"); 267 268 /* 269 * Flush any previously seen AP's. Note that the latter 270 * assumes we don't act as both an AP and a station, 271 * otherwise we'll potentially flush state of stations 272 * associated with us. 273 */ 274 ieee80211_free_allnodes(ic); 275 276 /* 277 * Reset the current mode. Setting the current mode will also 278 * reset scan state. 279 */ 280 if (IFM_MODE(ic->ic_media.ifm_cur->ifm_media) == IFM_AUTO) 281 ic->ic_curmode = IEEE80211_MODE_AUTO; 282 ieee80211_setmode(ic, ic->ic_curmode); 283 284 ic->ic_scan_count = 0; 285 286 /* Scan the next channel. */ 287 ieee80211_next_scan(ifp); 288 } 289 290 /* 291 * Switch to the next channel marked for scanning. 292 */ 293 void 294 ieee80211_next_scan(struct ifnet *ifp) 295 { 296 struct ieee80211com *ic = (void *)ifp; 297 struct ieee80211_channel *chan; 298 299 chan = ic->ic_bss->ni_chan; 300 for (;;) { 301 if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) 302 chan = &ic->ic_channels[0]; 303 if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { 304 /* 305 * Ignore channels marked passive-only 306 * during an active scan. 307 */ 308 if ((ic->ic_flags & IEEE80211_F_ASCAN) == 0 || 309 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) 310 break; 311 } 312 if (chan == ic->ic_bss->ni_chan) { 313 ieee80211_end_scan(ifp); 314 return; 315 } 316 } 317 clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); 318 DPRINTF(("chan %d->%d\n", 319 ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan), 320 ieee80211_chan2ieee(ic, chan))); 321 ic->ic_bss->ni_chan = chan; 322 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 323 } 324 325 #ifndef IEEE80211_STA_ONLY 326 void 327 ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) 328 { 329 struct ieee80211_node *ni; 330 struct ifnet *ifp = &ic->ic_if; 331 332 ni = ic->ic_bss; 333 if (ifp->if_flags & IFF_DEBUG) 334 printf("%s: creating ibss\n", ifp->if_xname); 335 ic->ic_flags |= IEEE80211_F_SIBSS; 336 ni->ni_chan = chan; 337 ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)]; 338 ni->ni_txrate = 0; 339 IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr); 340 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); 341 if (ic->ic_opmode == IEEE80211_M_IBSS) { 342 if ((ic->ic_flags & IEEE80211_F_DESBSSID) != 0) 343 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid); 344 else 345 ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ 346 } 347 ni->ni_esslen = ic->ic_des_esslen; 348 memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); 349 ni->ni_rssi = 0; 350 ni->ni_rstamp = 0; 351 memset(ni->ni_tstamp, 0, sizeof(ni->ni_tstamp)); 352 ni->ni_intval = ic->ic_lintval; 353 ni->ni_capinfo = IEEE80211_CAPINFO_IBSS; 354 if (ic->ic_flags & IEEE80211_F_WEPON) 355 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; 356 if (ic->ic_flags & IEEE80211_F_HTON) { 357 const struct ieee80211_edca_ac_params *ac_qap; 358 struct ieee80211_edca_ac_params *ac; 359 int aci; 360 361 /* 362 * Default to non-member HT protection. This will be updated 363 * later based on the number of non-HT nodes in the node cache. 364 */ 365 ni->ni_htop1 = IEEE80211_HTPROT_NONMEMBER; 366 ic->ic_protmode = IEEE80211_PROT_RTSCTS; 367 368 /* Configure QoS EDCA parameters. */ 369 for (aci = 0; aci < EDCA_NUM_AC; aci++) { 370 ac = &ic->ic_edca_ac[aci]; 371 ac_qap = &ieee80211_qap_edca_table[ic->ic_curmode][aci]; 372 ac->ac_acm = ac_qap->ac_acm; 373 ac->ac_aifsn = ac_qap->ac_aifsn; 374 ac->ac_ecwmin = ac_qap->ac_ecwmin; 375 ac->ac_ecwmax = ac_qap->ac_ecwmax; 376 ac->ac_txoplimit = ac_qap->ac_txoplimit; 377 } 378 if (ic->ic_updateedca) 379 (*ic->ic_updateedca)(ic); 380 } 381 if (ic->ic_flags & IEEE80211_F_RSNON) { 382 struct ieee80211_key *k; 383 384 /* initialize 256-bit global key counter to a random value */ 385 arc4random_buf(ic->ic_globalcnt, EAPOL_KEY_NONCE_LEN); 386 387 ni->ni_rsnprotos = ic->ic_rsnprotos; 388 ni->ni_rsnakms = ic->ic_rsnakms; 389 ni->ni_rsnciphers = ic->ic_rsnciphers; 390 ni->ni_rsngroupcipher = ic->ic_rsngroupcipher; 391 ni->ni_rsngroupmgmtcipher = ic->ic_rsngroupmgmtcipher; 392 ni->ni_rsncaps = 0; 393 if (ic->ic_caps & IEEE80211_C_MFP) { 394 ni->ni_rsncaps |= IEEE80211_RSNCAP_MFPC; 395 if (ic->ic_flags & IEEE80211_F_MFPR) 396 ni->ni_rsncaps |= IEEE80211_RSNCAP_MFPR; 397 } 398 399 ic->ic_def_txkey = 1; 400 ic->ic_flags &= ~IEEE80211_F_COUNTERM; 401 k = &ic->ic_nw_keys[ic->ic_def_txkey]; 402 memset(k, 0, sizeof(*k)); 403 k->k_id = ic->ic_def_txkey; 404 k->k_cipher = ni->ni_rsngroupcipher; 405 k->k_flags = IEEE80211_KEY_GROUP | IEEE80211_KEY_TX; 406 k->k_len = ieee80211_cipher_keylen(k->k_cipher); 407 arc4random_buf(k->k_key, k->k_len); 408 (*ic->ic_set_key)(ic, ni, k); /* XXX */ 409 410 if (ic->ic_caps & IEEE80211_C_MFP) { 411 ic->ic_igtk_kid = 4; 412 k = &ic->ic_nw_keys[ic->ic_igtk_kid]; 413 memset(k, 0, sizeof(*k)); 414 k->k_id = ic->ic_igtk_kid; 415 k->k_cipher = ni->ni_rsngroupmgmtcipher; 416 k->k_flags = IEEE80211_KEY_IGTK | IEEE80211_KEY_TX; 417 k->k_len = 16; 418 arc4random_buf(k->k_key, k->k_len); 419 (*ic->ic_set_key)(ic, ni, k); /* XXX */ 420 } 421 /* 422 * In HostAP mode, multicast traffic is sent using ic_bss 423 * as the Tx node, so mark our node as valid so we can send 424 * multicast frames using the group key we've just configured. 425 */ 426 ni->ni_port_valid = 1; 427 ni->ni_flags |= IEEE80211_NODE_TXPROT; 428 429 /* schedule a GTK/IGTK rekeying after 3600s */ 430 timeout_add_sec(&ic->ic_rsn_timeout, 3600); 431 } 432 timeout_add_sec(&ic->ic_inact_timeout, IEEE80211_INACT_WAIT); 433 timeout_add_sec(&ic->ic_node_cache_timeout, IEEE80211_CACHE_WAIT); 434 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 435 } 436 #endif /* IEEE80211_STA_ONLY */ 437 438 int 439 ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni) 440 { 441 u_int8_t rate; 442 int fail; 443 444 fail = 0; 445 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) 446 fail |= 0x01; 447 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 448 ni->ni_chan != ic->ic_des_chan) 449 fail |= 0x01; 450 #ifndef IEEE80211_STA_ONLY 451 if (ic->ic_opmode == IEEE80211_M_IBSS) { 452 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 453 fail |= 0x02; 454 } else 455 #endif 456 { 457 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) 458 fail |= 0x02; 459 } 460 if (ic->ic_flags & (IEEE80211_F_WEPON | IEEE80211_F_RSNON)) { 461 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 462 fail |= 0x04; 463 } else { 464 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) 465 fail |= 0x04; 466 } 467 468 rate = ieee80211_fix_rate(ic, ni, IEEE80211_F_DONEGO); 469 if (rate & IEEE80211_RATE_BASIC) 470 fail |= 0x08; 471 if (ic->ic_des_esslen != 0 && 472 (ni->ni_esslen != ic->ic_des_esslen || 473 memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0)) 474 fail |= 0x10; 475 if ((ic->ic_flags & IEEE80211_F_DESBSSID) && 476 !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) 477 fail |= 0x20; 478 479 if (ic->ic_flags & IEEE80211_F_RSNON) { 480 /* 481 * If at least one RSN IE field from the AP's RSN IE fails 482 * to overlap with any value the STA supports, the STA shall 483 * decline to associate with that AP. 484 */ 485 if ((ni->ni_rsnprotos & ic->ic_rsnprotos) == 0) 486 fail |= 0x40; 487 if ((ni->ni_rsnakms & ic->ic_rsnakms) == 0) 488 fail |= 0x40; 489 if ((ni->ni_rsnakms & ic->ic_rsnakms & 490 ~(IEEE80211_AKM_PSK | IEEE80211_AKM_SHA256_PSK)) == 0) { 491 /* AP only supports PSK AKMPs */ 492 if (!(ic->ic_flags & IEEE80211_F_PSK)) 493 fail |= 0x40; 494 } 495 if (ni->ni_rsngroupcipher != IEEE80211_CIPHER_WEP40 && 496 ni->ni_rsngroupcipher != IEEE80211_CIPHER_TKIP && 497 ni->ni_rsngroupcipher != IEEE80211_CIPHER_CCMP && 498 ni->ni_rsngroupcipher != IEEE80211_CIPHER_WEP104) 499 fail |= 0x40; 500 if ((ni->ni_rsnciphers & ic->ic_rsnciphers) == 0) 501 fail |= 0x40; 502 503 /* we only support BIP as the IGTK cipher */ 504 if ((ni->ni_rsncaps & IEEE80211_RSNCAP_MFPC) && 505 ni->ni_rsngroupmgmtcipher != IEEE80211_CIPHER_BIP) 506 fail |= 0x40; 507 508 /* we do not support MFP but AP requires it */ 509 if (!(ic->ic_caps & IEEE80211_C_MFP) && 510 (ni->ni_rsncaps & IEEE80211_RSNCAP_MFPR)) 511 fail |= 0x40; 512 513 /* we require MFP but AP does not support it */ 514 if ((ic->ic_caps & IEEE80211_C_MFP) && 515 (ic->ic_flags & IEEE80211_F_MFPR) && 516 !(ni->ni_rsncaps & IEEE80211_RSNCAP_MFPC)) 517 fail |= 0x40; 518 } 519 520 #ifdef IEEE80211_DEBUG 521 if (ic->ic_if.if_flags & IFF_DEBUG) { 522 printf(" %c %s", fail ? '-' : '+', 523 ether_sprintf(ni->ni_macaddr)); 524 printf(" %s%c", ether_sprintf(ni->ni_bssid), 525 fail & 0x20 ? '!' : ' '); 526 printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), 527 fail & 0x01 ? '!' : ' '); 528 printf(" %+4d", ni->ni_rssi); 529 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 530 fail & 0x08 ? '!' : ' '); 531 printf(" %4s%c", 532 (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 533 (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 534 "????", 535 fail & 0x02 ? '!' : ' '); 536 printf(" %7s%c ", 537 (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 538 "privacy" : "no", 539 fail & 0x04 ? '!' : ' '); 540 printf(" %3s%c ", 541 (ic->ic_flags & IEEE80211_F_RSNON) ? 542 "rsn" : "no", 543 fail & 0x40 ? '!' : ' '); 544 ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); 545 printf("%s\n", fail & 0x10 ? "!" : ""); 546 } 547 #endif 548 return fail; 549 } 550 551 /* 552 * Complete a scan of potential channels. 553 */ 554 void 555 ieee80211_end_scan(struct ifnet *ifp) 556 { 557 struct ieee80211com *ic = (void *)ifp; 558 struct ieee80211_node *ni, *nextbs, *selbs; 559 560 if (ifp->if_flags & IFF_DEBUG) 561 printf("%s: end %s scan\n", ifp->if_xname, 562 (ic->ic_flags & IEEE80211_F_ASCAN) ? 563 "active" : "passive"); 564 565 if (ic->ic_scan_count) 566 ic->ic_flags &= ~IEEE80211_F_ASCAN; 567 568 ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); 569 570 #ifndef IEEE80211_STA_ONLY 571 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 572 /* XXX off stack? */ 573 u_char occupied[howmany(IEEE80211_CHAN_MAX, NBBY)]; 574 int i, fail; 575 576 /* 577 * The passive scan to look for existing AP's completed, 578 * select a channel to camp on. Identify the channels 579 * that already have one or more AP's and try to locate 580 * an unoccupied one. If that fails, pick a random 581 * channel from the active set. 582 */ 583 memset(occupied, 0, sizeof(occupied)); 584 RBT_FOREACH(ni, ieee80211_tree, &ic->ic_tree) 585 setbit(occupied, ieee80211_chan2ieee(ic, ni->ni_chan)); 586 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 587 if (isset(ic->ic_chan_active, i) && isclr(occupied, i)) 588 break; 589 if (i == IEEE80211_CHAN_MAX) { 590 fail = arc4random() & 3; /* random 0-3 */ 591 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 592 if (isset(ic->ic_chan_active, i) && fail-- == 0) 593 break; 594 } 595 ieee80211_create_ibss(ic, &ic->ic_channels[i]); 596 goto wakeup; 597 } 598 #endif 599 if (ni == NULL) { 600 DPRINTF(("no scan candidate\n")); 601 notfound: 602 603 #ifndef IEEE80211_STA_ONLY 604 if (ic->ic_opmode == IEEE80211_M_IBSS && 605 (ic->ic_flags & IEEE80211_F_IBSSON) && 606 ic->ic_des_esslen != 0) { 607 ieee80211_create_ibss(ic, ic->ic_ibss_chan); 608 goto wakeup; 609 } 610 #endif 611 /* 612 * Scan the next mode if nothing has been found. This 613 * is necessary if the device supports different 614 * incompatible modes in the same channel range, like 615 * like 11b and "pure" 11G mode. 616 * If the device scans all bands in one fell swoop, return 617 * current scan results to userspace regardless of mode. 618 * This will loop forever except for user-initiated scans. 619 */ 620 if (ieee80211_next_mode(ifp) == IEEE80211_MODE_AUTO || 621 (ic->ic_caps & IEEE80211_C_SCANALLBAND)) { 622 if (ic->ic_scan_lock & IEEE80211_SCAN_REQUEST && 623 ic->ic_scan_lock & IEEE80211_SCAN_RESUME) { 624 ic->ic_scan_lock = IEEE80211_SCAN_LOCKED; 625 /* Return from a user-initiated scan. */ 626 wakeup(&ic->ic_scan_lock); 627 } else if (ic->ic_scan_lock & IEEE80211_SCAN_REQUEST) 628 goto wakeup; 629 ic->ic_scan_count++; 630 } 631 632 /* 633 * Reset the list of channels to scan and start again. 634 */ 635 ieee80211_next_scan(ifp); 636 return; 637 } 638 selbs = NULL; 639 640 for (; ni != NULL; ni = nextbs) { 641 nextbs = RBT_NEXT(ieee80211_tree, ni); 642 if (ni->ni_fails) { 643 /* 644 * The configuration of the access points may change 645 * during my scan. So delete the entry for the AP 646 * and retry to associate if there is another beacon. 647 */ 648 if (ni->ni_fails++ > 2) 649 ieee80211_free_node(ic, ni); 650 continue; 651 } 652 if (ieee80211_match_bss(ic, ni) != 0) 653 continue; 654 655 /* Pick the AP/IBSS match with the best RSSI. */ 656 if (selbs == NULL) 657 selbs = ni; 658 else if ((ic->ic_caps & IEEE80211_C_SCANALLBAND) && 659 IEEE80211_IS_CHAN_5GHZ(selbs->ni_chan) && 660 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan) && 661 selbs->ni_rssi >= (ic->ic_max_rssi - (ic->ic_max_rssi / 4))) 662 /* 663 * Prefer 5GHz (with reasonable RSSI) over 2GHz since 664 * the 5GHz band is usually less saturated. 665 */ 666 continue; 667 else if (ni->ni_rssi > selbs->ni_rssi) 668 selbs = ni; 669 } 670 if (selbs == NULL) 671 goto notfound; 672 (*ic->ic_node_copy)(ic, ic->ic_bss, selbs); 673 ni = ic->ic_bss; 674 675 ic->ic_curmode = ieee80211_chan2mode(ic, ni->ni_chan); 676 677 /* Make sure we send valid rates in an association request. */ 678 if (ic->ic_opmode == IEEE80211_M_STA) 679 ieee80211_fix_rate(ic, ni, 680 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 681 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 682 683 if (ic->ic_flags & IEEE80211_F_RSNON) 684 ieee80211_choose_rsnparams(ic); 685 else if (ic->ic_flags & IEEE80211_F_WEPON) 686 ni->ni_rsncipher = IEEE80211_CIPHER_USEGROUP; 687 688 ieee80211_node_newstate(selbs, IEEE80211_STA_BSS); 689 #ifndef IEEE80211_STA_ONLY 690 if (ic->ic_opmode == IEEE80211_M_IBSS) { 691 ieee80211_fix_rate(ic, ni, IEEE80211_F_DOFRATE | 692 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 693 if (ni->ni_rates.rs_nrates == 0) 694 goto notfound; 695 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 696 } else 697 #endif 698 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 699 700 wakeup: 701 if (ic->ic_scan_lock & IEEE80211_SCAN_REQUEST) { 702 /* Return from a user-initiated scan. */ 703 wakeup(&ic->ic_scan_lock); 704 } 705 706 ic->ic_scan_lock = IEEE80211_SCAN_UNLOCKED; 707 } 708 709 /* 710 * Autoselect the best RSN parameters (protocol, AKMP, pairwise cipher...) 711 * that are supported by both peers (STA mode only). 712 */ 713 void 714 ieee80211_choose_rsnparams(struct ieee80211com *ic) 715 { 716 struct ieee80211_node *ni = ic->ic_bss; 717 struct ieee80211_pmk *pmk; 718 719 /* filter out unsupported protocol versions */ 720 ni->ni_rsnprotos &= ic->ic_rsnprotos; 721 /* prefer RSN (aka WPA2) over WPA */ 722 if (ni->ni_rsnprotos & IEEE80211_PROTO_RSN) 723 ni->ni_rsnprotos = IEEE80211_PROTO_RSN; 724 else 725 ni->ni_rsnprotos = IEEE80211_PROTO_WPA; 726 727 /* filter out unsupported AKMPs */ 728 ni->ni_rsnakms &= ic->ic_rsnakms; 729 /* prefer SHA-256 based AKMPs */ 730 if ((ic->ic_flags & IEEE80211_F_PSK) && (ni->ni_rsnakms & 731 (IEEE80211_AKM_PSK | IEEE80211_AKM_SHA256_PSK))) { 732 /* AP supports PSK AKMP and a PSK is configured */ 733 if (ni->ni_rsnakms & IEEE80211_AKM_SHA256_PSK) 734 ni->ni_rsnakms = IEEE80211_AKM_SHA256_PSK; 735 else 736 ni->ni_rsnakms = IEEE80211_AKM_PSK; 737 } else { 738 if (ni->ni_rsnakms & IEEE80211_AKM_SHA256_8021X) 739 ni->ni_rsnakms = IEEE80211_AKM_SHA256_8021X; 740 else 741 ni->ni_rsnakms = IEEE80211_AKM_8021X; 742 /* check if we have a cached PMK for this AP */ 743 if (ni->ni_rsnprotos == IEEE80211_PROTO_RSN && 744 (pmk = ieee80211_pmksa_find(ic, ni, NULL)) != NULL) { 745 memcpy(ni->ni_pmkid, pmk->pmk_pmkid, 746 IEEE80211_PMKID_LEN); 747 ni->ni_flags |= IEEE80211_NODE_PMKID; 748 } 749 } 750 751 /* filter out unsupported pairwise ciphers */ 752 ni->ni_rsnciphers &= ic->ic_rsnciphers; 753 /* prefer CCMP over TKIP */ 754 if (ni->ni_rsnciphers & IEEE80211_CIPHER_CCMP) 755 ni->ni_rsnciphers = IEEE80211_CIPHER_CCMP; 756 else 757 ni->ni_rsnciphers = IEEE80211_CIPHER_TKIP; 758 ni->ni_rsncipher = ni->ni_rsnciphers; 759 760 /* use MFP if we both support it */ 761 if ((ic->ic_caps & IEEE80211_C_MFP) && 762 (ni->ni_rsncaps & IEEE80211_RSNCAP_MFPC)) 763 ni->ni_flags |= IEEE80211_NODE_MFP; 764 } 765 766 int 767 ieee80211_get_rate(struct ieee80211com *ic) 768 { 769 u_int8_t (*rates)[IEEE80211_RATE_MAXSIZE]; 770 int rate; 771 772 rates = &ic->ic_bss->ni_rates.rs_rates; 773 774 if (ic->ic_fixed_rate != -1) 775 rate = (*rates)[ic->ic_fixed_rate]; 776 else if (ic->ic_state == IEEE80211_S_RUN) 777 rate = (*rates)[ic->ic_bss->ni_txrate]; 778 else 779 rate = 0; 780 781 return rate & IEEE80211_RATE_VAL; 782 } 783 784 struct ieee80211_node * 785 ieee80211_node_alloc(struct ieee80211com *ic) 786 { 787 return malloc(sizeof(struct ieee80211_node), M_DEVBUF, 788 M_NOWAIT | M_ZERO); 789 } 790 791 void 792 ieee80211_node_cleanup(struct ieee80211com *ic, struct ieee80211_node *ni) 793 { 794 if (ni->ni_rsnie != NULL) { 795 free(ni->ni_rsnie, M_DEVBUF, 0); 796 ni->ni_rsnie = NULL; 797 } 798 ieee80211_ba_del(ni); 799 } 800 801 void 802 ieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni) 803 { 804 ieee80211_node_cleanup(ic, ni); 805 free(ni, M_DEVBUF, 0); 806 } 807 808 void 809 ieee80211_node_copy(struct ieee80211com *ic, 810 struct ieee80211_node *dst, const struct ieee80211_node *src) 811 { 812 ieee80211_node_cleanup(ic, dst); 813 *dst = *src; 814 dst->ni_rsnie = NULL; 815 if (src->ni_rsnie != NULL) 816 ieee80211_save_ie(src->ni_rsnie, &dst->ni_rsnie); 817 } 818 819 u_int8_t 820 ieee80211_node_getrssi(struct ieee80211com *ic, 821 const struct ieee80211_node *ni) 822 { 823 return ni->ni_rssi; 824 } 825 826 void 827 ieee80211_setup_node(struct ieee80211com *ic, 828 struct ieee80211_node *ni, const u_int8_t *macaddr) 829 { 830 int s; 831 832 DPRINTF(("%s\n", ether_sprintf((u_int8_t *)macaddr))); 833 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 834 ieee80211_node_newstate(ni, IEEE80211_STA_CACHE); 835 836 ni->ni_ic = ic; /* back-pointer */ 837 #ifndef IEEE80211_STA_ONLY 838 mq_init(&ni->ni_savedq, IEEE80211_PS_MAX_QUEUE, IPL_NET); 839 timeout_set(&ni->ni_eapol_to, ieee80211_eapol_timeout, ni); 840 timeout_set(&ni->ni_sa_query_to, ieee80211_sa_query_timeout, ni); 841 #endif 842 s = splnet(); 843 RBT_INSERT(ieee80211_tree, &ic->ic_tree, ni); 844 ic->ic_nnodes++; 845 splx(s); 846 } 847 848 struct ieee80211_node * 849 ieee80211_alloc_node(struct ieee80211com *ic, const u_int8_t *macaddr) 850 { 851 struct ieee80211_node *ni = ieee80211_alloc_node_helper(ic); 852 if (ni != NULL) 853 ieee80211_setup_node(ic, ni, macaddr); 854 else 855 ic->ic_stats.is_rx_nodealloc++; 856 return ni; 857 } 858 859 struct ieee80211_node * 860 ieee80211_dup_bss(struct ieee80211com *ic, const u_int8_t *macaddr) 861 { 862 struct ieee80211_node *ni = ieee80211_alloc_node_helper(ic); 863 if (ni != NULL) { 864 ieee80211_setup_node(ic, ni, macaddr); 865 /* 866 * Inherit from ic_bss. 867 */ 868 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); 869 ni->ni_chan = ic->ic_bss->ni_chan; 870 } else 871 ic->ic_stats.is_rx_nodealloc++; 872 return ni; 873 } 874 875 struct ieee80211_node * 876 ieee80211_find_node(struct ieee80211com *ic, const u_int8_t *macaddr) 877 { 878 struct ieee80211_node *ni; 879 int cmp; 880 881 /* similar to RBT_FIND except we compare keys, not nodes */ 882 ni = RBT_ROOT(ieee80211_tree, &ic->ic_tree); 883 while (ni != NULL) { 884 cmp = memcmp(macaddr, ni->ni_macaddr, IEEE80211_ADDR_LEN); 885 if (cmp < 0) 886 ni = RBT_LEFT(ieee80211_tree, ni); 887 else if (cmp > 0) 888 ni = RBT_RIGHT(ieee80211_tree, ni); 889 else 890 break; 891 } 892 return ni; 893 } 894 895 /* 896 * Return a reference to the appropriate node for sending 897 * a data frame. This handles node discovery in adhoc networks. 898 * 899 * Drivers will call this, so increase the reference count before 900 * returning the node. 901 */ 902 struct ieee80211_node * 903 ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr) 904 { 905 #ifndef IEEE80211_STA_ONLY 906 struct ieee80211_node *ni; 907 int s; 908 #endif 909 910 /* 911 * The destination address should be in the node table 912 * unless we are operating in station mode or this is a 913 * multicast/broadcast frame. 914 */ 915 if (ic->ic_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(macaddr)) 916 return ieee80211_ref_node(ic->ic_bss); 917 918 #ifndef IEEE80211_STA_ONLY 919 s = splnet(); 920 ni = ieee80211_find_node(ic, macaddr); 921 splx(s); 922 if (ni == NULL) { 923 if (ic->ic_opmode != IEEE80211_M_IBSS && 924 ic->ic_opmode != IEEE80211_M_AHDEMO) 925 return NULL; 926 927 /* 928 * Fake up a node; this handles node discovery in 929 * adhoc mode. Note that for the driver's benefit 930 * we we treat this like an association so the driver 931 * has an opportunity to setup its private state. 932 * 933 * XXX need better way to handle this; issue probe 934 * request so we can deduce rate set, etc. 935 */ 936 if ((ni = ieee80211_dup_bss(ic, macaddr)) == NULL) 937 return NULL; 938 /* XXX no rate negotiation; just dup */ 939 ni->ni_rates = ic->ic_bss->ni_rates; 940 ni->ni_txrate = 0; 941 if (ic->ic_newassoc) 942 (*ic->ic_newassoc)(ic, ni, 1); 943 } 944 return ieee80211_ref_node(ni); 945 #else 946 return NULL; /* can't get there */ 947 #endif /* IEEE80211_STA_ONLY */ 948 } 949 950 /* 951 * It is usually desirable to process a Rx packet using its sender's 952 * node-record instead of the BSS record. 953 * 954 * - AP mode: keep a node-record for every authenticated/associated 955 * station *in the BSS*. For future use, we also track neighboring 956 * APs, since they might belong to the same ESS. APs in the same 957 * ESS may bridge packets to each other, forming a Wireless 958 * Distribution System (WDS). 959 * 960 * - IBSS mode: keep a node-record for every station *in the BSS*. 961 * Also track neighboring stations by their beacons/probe responses. 962 * 963 * - monitor mode: keep a node-record for every sender, regardless 964 * of BSS. 965 * 966 * - STA mode: the only available node-record is the BSS record, 967 * ic->ic_bss. 968 * 969 * Of all the 802.11 Control packets, only the node-records for 970 * RTS packets node-record can be looked up. 971 * 972 * Return non-zero if the packet's node-record is kept, zero 973 * otherwise. 974 */ 975 static __inline int 976 ieee80211_needs_rxnode(struct ieee80211com *ic, 977 const struct ieee80211_frame *wh, const u_int8_t **bssid) 978 { 979 int monitor, rc = 0; 980 981 monitor = (ic->ic_opmode == IEEE80211_M_MONITOR); 982 983 *bssid = NULL; 984 985 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) { 986 case IEEE80211_FC0_TYPE_CTL: 987 if (!monitor) 988 break; 989 return (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == 990 IEEE80211_FC0_SUBTYPE_RTS; 991 case IEEE80211_FC0_TYPE_MGT: 992 *bssid = wh->i_addr3; 993 switch (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) { 994 case IEEE80211_FC0_SUBTYPE_BEACON: 995 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 996 break; 997 default: 998 #ifndef IEEE80211_STA_ONLY 999 if (ic->ic_opmode == IEEE80211_M_STA) 1000 break; 1001 rc = IEEE80211_ADDR_EQ(*bssid, ic->ic_bss->ni_bssid) || 1002 IEEE80211_ADDR_EQ(*bssid, etherbroadcastaddr); 1003 #endif 1004 break; 1005 } 1006 break; 1007 case IEEE80211_FC0_TYPE_DATA: 1008 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 1009 case IEEE80211_FC1_DIR_NODS: 1010 *bssid = wh->i_addr3; 1011 #ifndef IEEE80211_STA_ONLY 1012 if (ic->ic_opmode == IEEE80211_M_IBSS || 1013 ic->ic_opmode == IEEE80211_M_AHDEMO) 1014 rc = IEEE80211_ADDR_EQ(*bssid, 1015 ic->ic_bss->ni_bssid); 1016 #endif 1017 break; 1018 case IEEE80211_FC1_DIR_TODS: 1019 *bssid = wh->i_addr1; 1020 #ifndef IEEE80211_STA_ONLY 1021 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 1022 rc = IEEE80211_ADDR_EQ(*bssid, 1023 ic->ic_bss->ni_bssid); 1024 #endif 1025 break; 1026 case IEEE80211_FC1_DIR_FROMDS: 1027 case IEEE80211_FC1_DIR_DSTODS: 1028 *bssid = wh->i_addr2; 1029 #ifndef IEEE80211_STA_ONLY 1030 rc = (ic->ic_opmode == IEEE80211_M_HOSTAP); 1031 #endif 1032 break; 1033 } 1034 break; 1035 } 1036 return monitor || rc; 1037 } 1038 1039 /* 1040 * Drivers call this, so increase the reference count before returning 1041 * the node. 1042 */ 1043 struct ieee80211_node * 1044 ieee80211_find_rxnode(struct ieee80211com *ic, 1045 const struct ieee80211_frame *wh) 1046 { 1047 static const u_int8_t zero[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; 1048 struct ieee80211_node *ni; 1049 const u_int8_t *bssid; 1050 int s; 1051 1052 if (!ieee80211_needs_rxnode(ic, wh, &bssid)) 1053 return ieee80211_ref_node(ic->ic_bss); 1054 1055 s = splnet(); 1056 ni = ieee80211_find_node(ic, wh->i_addr2); 1057 splx(s); 1058 1059 if (ni != NULL) 1060 return ieee80211_ref_node(ni); 1061 #ifndef IEEE80211_STA_ONLY 1062 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 1063 return ieee80211_ref_node(ic->ic_bss); 1064 #endif 1065 /* XXX see remarks in ieee80211_find_txnode */ 1066 /* XXX no rate negotiation; just dup */ 1067 if ((ni = ieee80211_dup_bss(ic, wh->i_addr2)) == NULL) 1068 return ieee80211_ref_node(ic->ic_bss); 1069 1070 IEEE80211_ADDR_COPY(ni->ni_bssid, (bssid != NULL) ? bssid : zero); 1071 1072 ni->ni_rates = ic->ic_bss->ni_rates; 1073 ni->ni_txrate = 0; 1074 if (ic->ic_newassoc) 1075 (*ic->ic_newassoc)(ic, ni, 1); 1076 1077 DPRINTF(("faked-up node %p for %s\n", ni, 1078 ether_sprintf((u_int8_t *)wh->i_addr2))); 1079 1080 return ieee80211_ref_node(ni); 1081 } 1082 1083 struct ieee80211_node * 1084 ieee80211_find_node_for_beacon(struct ieee80211com *ic, 1085 const u_int8_t *macaddr, const struct ieee80211_channel *chan, 1086 const char *ssid, u_int8_t rssi) 1087 { 1088 struct ieee80211_node *ni, *keep = NULL; 1089 int s, score = 0; 1090 1091 if ((ni = ieee80211_find_node(ic, macaddr)) != NULL) { 1092 s = splnet(); 1093 1094 if (ni->ni_chan != chan && ni->ni_rssi >= rssi) 1095 score++; 1096 if (ssid[1] == 0 && ni->ni_esslen != 0) 1097 score++; 1098 if (score > 0) 1099 keep = ni; 1100 1101 splx(s); 1102 } 1103 1104 return (keep); 1105 } 1106 1107 void 1108 ieee80211_ba_del(struct ieee80211_node *ni) 1109 { 1110 int tid; 1111 1112 for (tid = 0; tid < nitems(ni->ni_rx_ba); tid++) { 1113 struct ieee80211_rx_ba *ba = &ni->ni_rx_ba[tid]; 1114 if (ba->ba_state != IEEE80211_BA_INIT) { 1115 if (timeout_pending(&ba->ba_to)) 1116 timeout_del(&ba->ba_to); 1117 if (timeout_pending(&ba->ba_gap_to)) 1118 timeout_del(&ba->ba_gap_to); 1119 ba->ba_state = IEEE80211_BA_INIT; 1120 } 1121 } 1122 1123 for (tid = 0; tid < nitems(ni->ni_tx_ba); tid++) { 1124 struct ieee80211_tx_ba *ba = &ni->ni_tx_ba[tid]; 1125 if (ba->ba_state != IEEE80211_BA_INIT) { 1126 if (timeout_pending(&ba->ba_to)) 1127 timeout_del(&ba->ba_to); 1128 ba->ba_state = IEEE80211_BA_INIT; 1129 } 1130 } 1131 } 1132 1133 void 1134 ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 1135 { 1136 if (ni == ic->ic_bss) 1137 panic("freeing bss node"); 1138 1139 splassert(IPL_NET); 1140 1141 DPRINTF(("%s\n", ether_sprintf(ni->ni_macaddr))); 1142 #ifndef IEEE80211_STA_ONLY 1143 timeout_del(&ni->ni_eapol_to); 1144 timeout_del(&ni->ni_sa_query_to); 1145 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1146 #endif 1147 ieee80211_ba_del(ni); 1148 RBT_REMOVE(ieee80211_tree, &ic->ic_tree, ni); 1149 ic->ic_nnodes--; 1150 #ifndef IEEE80211_STA_ONLY 1151 if (mq_purge(&ni->ni_savedq) > 0) { 1152 if (ic->ic_set_tim != NULL) 1153 (*ic->ic_set_tim)(ic, ni->ni_associd, 0); 1154 } 1155 #endif 1156 (*ic->ic_node_free)(ic, ni); 1157 /* TBD indicate to drivers that a new node can be allocated */ 1158 } 1159 1160 void 1161 ieee80211_release_node(struct ieee80211com *ic, struct ieee80211_node *ni) 1162 { 1163 int s; 1164 1165 DPRINTF(("%s refcnt %u\n", ether_sprintf(ni->ni_macaddr), 1166 ni->ni_refcnt)); 1167 s = splnet(); 1168 if (ieee80211_node_decref(ni) == 0 && 1169 ni->ni_state == IEEE80211_STA_COLLECT) { 1170 ieee80211_free_node(ic, ni); 1171 } 1172 splx(s); 1173 } 1174 1175 void 1176 ieee80211_free_allnodes(struct ieee80211com *ic) 1177 { 1178 struct ieee80211_node *ni; 1179 int s; 1180 1181 DPRINTF(("freeing all nodes\n")); 1182 s = splnet(); 1183 while ((ni = RBT_MIN(ieee80211_tree, &ic->ic_tree)) != NULL) 1184 ieee80211_free_node(ic, ni); 1185 splx(s); 1186 1187 if (ic->ic_bss != NULL) 1188 ieee80211_node_cleanup(ic, ic->ic_bss); /* for station mode */ 1189 } 1190 1191 void 1192 ieee80211_clean_cached(struct ieee80211com *ic) 1193 { 1194 struct ieee80211_node *ni, *next_ni; 1195 int s; 1196 1197 s = splnet(); 1198 for (ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); 1199 ni != NULL; ni = next_ni) { 1200 next_ni = RBT_NEXT(ieee80211_tree, ni); 1201 if (ni->ni_state == IEEE80211_STA_CACHE) 1202 ieee80211_free_node(ic, ni); 1203 } 1204 splx(s); 1205 } 1206 /* 1207 * Timeout inactive nodes. 1208 * 1209 * If called because of a cache timeout, which happens only in hostap and ibss 1210 * modes, clean all inactive cached or authenticated nodes but don't de-auth 1211 * any associated nodes. Also update HT protection settings. 1212 * 1213 * Else, this function is called because a new node must be allocated but the 1214 * node cache is full. In this case, return as soon as a free slot was made 1215 * available. If acting as hostap, clean cached nodes regardless of their 1216 * recent activity and also allow de-authing of authenticated nodes older 1217 * than one cache wait interval, and de-authing of inactive associated nodes. 1218 */ 1219 void 1220 ieee80211_clean_nodes(struct ieee80211com *ic, int cache_timeout) 1221 { 1222 struct ieee80211_node *ni, *next_ni; 1223 u_int gen = ic->ic_scangen++; /* NB: ok 'cuz single-threaded*/ 1224 int s; 1225 #ifndef IEEE80211_STA_ONLY 1226 int nnodes = 0, nonht = 0, nonhtassoc = 0; 1227 struct ifnet *ifp = &ic->ic_if; 1228 enum ieee80211_htprot htprot = IEEE80211_HTPROT_NONE; 1229 enum ieee80211_protmode protmode = IEEE80211_PROT_NONE; 1230 #endif 1231 1232 s = splnet(); 1233 for (ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); 1234 ni != NULL; ni = next_ni) { 1235 next_ni = RBT_NEXT(ieee80211_tree, ni); 1236 if (!cache_timeout && ic->ic_nnodes < ic->ic_max_nnodes) 1237 break; 1238 if (ni->ni_scangen == gen) /* previously handled */ 1239 continue; 1240 #ifndef IEEE80211_STA_ONLY 1241 nnodes++; 1242 if ((ic->ic_flags & IEEE80211_F_HTON) && cache_timeout) { 1243 if ((ni->ni_rxmcs[0] & 0xff) == 0) { 1244 nonht++; 1245 if (ni->ni_state == IEEE80211_STA_ASSOC) 1246 nonhtassoc++; 1247 } 1248 } 1249 #endif 1250 ni->ni_scangen = gen; 1251 if (ni->ni_refcnt > 0) 1252 continue; 1253 #ifndef IEEE80211_STA_ONLY 1254 if ((ic->ic_opmode == IEEE80211_M_HOSTAP || 1255 ic->ic_opmode == IEEE80211_M_IBSS) && 1256 ic->ic_state == IEEE80211_S_RUN) { 1257 if (cache_timeout) { 1258 if (ni->ni_state != IEEE80211_STA_COLLECT && 1259 (ni->ni_state == IEEE80211_STA_ASSOC || 1260 ni->ni_inact < IEEE80211_INACT_MAX)) 1261 continue; 1262 } else { 1263 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 1264 ((ni->ni_state == IEEE80211_STA_ASSOC && 1265 ni->ni_inact < IEEE80211_INACT_MAX) || 1266 (ni->ni_state == IEEE80211_STA_AUTH && 1267 ni->ni_inact == 0))) 1268 continue; 1269 1270 if (ic->ic_opmode == IEEE80211_M_IBSS && 1271 ni->ni_state != IEEE80211_STA_COLLECT && 1272 ni->ni_state != IEEE80211_STA_CACHE && 1273 ni->ni_inact < IEEE80211_INACT_MAX) 1274 continue; 1275 } 1276 } 1277 if (ifp->if_flags & IFF_DEBUG) 1278 printf("%s: station %s purged from node cache\n", 1279 ifp->if_xname, ether_sprintf(ni->ni_macaddr)); 1280 #endif 1281 /* 1282 * If we're hostap and the node is authenticated, send 1283 * a deauthentication frame. The node will be freed when 1284 * the driver calls ieee80211_release_node(). 1285 */ 1286 #ifndef IEEE80211_STA_ONLY 1287 nnodes--; 1288 if ((ic->ic_flags & IEEE80211_F_HTON) && cache_timeout) { 1289 if ((ni->ni_rxmcs[0] & 0xff) == 0) { 1290 nonht--; 1291 if (ni->ni_state == IEEE80211_STA_ASSOC) 1292 nonhtassoc--; 1293 } 1294 } 1295 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 1296 ni->ni_state >= IEEE80211_STA_AUTH && 1297 ni->ni_state != IEEE80211_STA_COLLECT) { 1298 IEEE80211_SEND_MGMT(ic, ni, 1299 IEEE80211_FC0_SUBTYPE_DEAUTH, 1300 IEEE80211_REASON_AUTH_EXPIRE); 1301 ieee80211_node_leave(ic, ni); 1302 } else 1303 #endif 1304 ieee80211_free_node(ic, ni); 1305 ic->ic_stats.is_node_timeout++; 1306 } 1307 1308 #ifndef IEEE80211_STA_ONLY 1309 if ((ic->ic_flags & IEEE80211_F_HTON) && cache_timeout) { 1310 /* Update HT protection settings. */ 1311 if (nonht) { 1312 protmode = IEEE80211_PROT_RTSCTS; 1313 if (nonhtassoc) 1314 htprot = IEEE80211_HTPROT_NONHT_MIXED; 1315 else 1316 htprot = IEEE80211_HTPROT_NONMEMBER; 1317 } 1318 if (ic->ic_bss->ni_htop1 != htprot) { 1319 ic->ic_bss->ni_htop1 = htprot; 1320 ic->ic_protmode = protmode; 1321 if (ic->ic_update_htprot) 1322 ic->ic_update_htprot(ic, ic->ic_bss); 1323 } 1324 } 1325 1326 /* 1327 * During a cache timeout we iterate over all nodes. 1328 * Check for node leaks by comparing the actual number of cached 1329 * nodes with the ic_nnodes count, which is maintained while adding 1330 * and removing nodes from the cache. 1331 */ 1332 if ((ifp->if_flags & IFF_DEBUG) && cache_timeout && 1333 nnodes != ic->ic_nnodes) 1334 printf("%s: number of cached nodes is %d, expected %d," 1335 "possible nodes leak\n", ifp->if_xname, nnodes, 1336 ic->ic_nnodes); 1337 #endif 1338 splx(s); 1339 } 1340 1341 void 1342 ieee80211_iterate_nodes(struct ieee80211com *ic, ieee80211_iter_func *f, 1343 void *arg) 1344 { 1345 struct ieee80211_node *ni; 1346 int s; 1347 1348 s = splnet(); 1349 RBT_FOREACH(ni, ieee80211_tree, &ic->ic_tree) 1350 (*f)(arg, ni); 1351 splx(s); 1352 } 1353 1354 1355 /* 1356 * Install received HT caps information in the node's state block. 1357 */ 1358 void 1359 ieee80211_setup_htcaps(struct ieee80211_node *ni, const uint8_t *data, 1360 uint8_t len) 1361 { 1362 uint16_t rxrate; 1363 1364 if (len != 26) 1365 return; 1366 1367 ni->ni_htcaps = (data[0] | (data[1] << 8)); 1368 ni->ni_ampdu_param = data[2]; 1369 1370 memcpy(ni->ni_rxmcs, &data[3], sizeof(ni->ni_rxmcs)); 1371 /* clear reserved bits */ 1372 clrbit(ni->ni_rxmcs, 77); 1373 clrbit(ni->ni_rxmcs, 78); 1374 clrbit(ni->ni_rxmcs, 79); 1375 1376 /* Max MCS Rx rate in 1Mb/s units (0 means "not specified"). */ 1377 rxrate = ((data[13] | (data[14]) << 8) & IEEE80211_MCS_RX_RATE_HIGH); 1378 if (rxrate < 1024) 1379 ni->ni_max_rxrate = rxrate; 1380 1381 ni->ni_tx_mcs_set = data[15]; 1382 ni->ni_htxcaps = (data[19] | (data[20] << 8)); 1383 ni->ni_txbfcaps = (data[21] | (data[22] << 8) | (data[23] << 16) | 1384 (data[24] << 24)); 1385 ni->ni_aselcaps = data[25]; 1386 } 1387 1388 #ifndef IEEE80211_STA_ONLY 1389 /* 1390 * Handle nodes switching from 11n into legacy modes. 1391 */ 1392 void 1393 ieee80211_clear_htcaps(struct ieee80211_node *ni) 1394 { 1395 ni->ni_htcaps = 0; 1396 ni->ni_ampdu_param = 0; 1397 memset(ni->ni_rxmcs, 0, sizeof(ni->ni_rxmcs)); 1398 ni->ni_max_rxrate = 0; 1399 ni->ni_tx_mcs_set = 0; 1400 ni->ni_htxcaps = 0; 1401 ni->ni_txbfcaps = 0; 1402 ni->ni_aselcaps = 0; 1403 1404 ni->ni_flags &= ~IEEE80211_NODE_HT; 1405 1406 } 1407 #endif 1408 1409 /* 1410 * Install received HT op information in the node's state block. 1411 */ 1412 int 1413 ieee80211_setup_htop(struct ieee80211_node *ni, const uint8_t *data, 1414 uint8_t len) 1415 { 1416 if (len != 22) 1417 return 0; 1418 1419 ni->ni_primary_chan = data[0]; /* XXX corresponds to ni_chan */ 1420 1421 ni->ni_htop0 = data[1]; 1422 ni->ni_htop1 = (data[2] | (data[3] << 8)); 1423 ni->ni_htop2 = (data[3] | (data[4] << 8)); 1424 1425 memcpy(ni->ni_basic_mcs, &data[6], sizeof(ni->ni_basic_mcs)); 1426 1427 return 1; 1428 } 1429 1430 /* 1431 * Install received rate set information in the node's state block. 1432 */ 1433 int 1434 ieee80211_setup_rates(struct ieee80211com *ic, struct ieee80211_node *ni, 1435 const u_int8_t *rates, const u_int8_t *xrates, int flags) 1436 { 1437 struct ieee80211_rateset *rs = &ni->ni_rates; 1438 1439 memset(rs, 0, sizeof(*rs)); 1440 rs->rs_nrates = rates[1]; 1441 memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); 1442 if (xrates != NULL) { 1443 u_int8_t nxrates; 1444 /* 1445 * Tack on 11g extended supported rate element. 1446 */ 1447 nxrates = xrates[1]; 1448 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 1449 nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; 1450 DPRINTF(("extended rate set too large; " 1451 "only using %u of %u rates\n", 1452 nxrates, xrates[1])); 1453 ic->ic_stats.is_rx_rstoobig++; 1454 } 1455 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); 1456 rs->rs_nrates += nxrates; 1457 } 1458 return ieee80211_fix_rate(ic, ni, flags); 1459 } 1460 1461 #ifndef IEEE80211_STA_ONLY 1462 /* 1463 * Check if the specified node supports ERP. 1464 */ 1465 int 1466 ieee80211_iserp_sta(const struct ieee80211_node *ni) 1467 { 1468 static const u_int8_t rates[] = { 2, 4, 11, 22, 12, 24, 48 }; 1469 const struct ieee80211_rateset *rs = &ni->ni_rates; 1470 int i, j; 1471 1472 /* 1473 * A STA supports ERP operation if it includes all the Clause 19 1474 * mandatory rates in its supported rate set. 1475 */ 1476 for (i = 0; i < nitems(rates); i++) { 1477 for (j = 0; j < rs->rs_nrates; j++) { 1478 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == rates[i]) 1479 break; 1480 } 1481 if (j == rs->rs_nrates) 1482 return 0; 1483 } 1484 return 1; 1485 } 1486 1487 /* 1488 * This function is called to notify the 802.1X PACP machine that a new 1489 * 802.1X port is enabled and must be authenticated. For 802.11, a port 1490 * becomes enabled whenever a STA successfully completes Open System 1491 * authentication with an AP. 1492 */ 1493 void 1494 ieee80211_needs_auth(struct ieee80211com *ic, struct ieee80211_node *ni) 1495 { 1496 /* 1497 * XXX this could be done via the route socket of via a dedicated 1498 * EAP socket or another kernel->userland notification mechanism. 1499 * The notification should include the MAC address (ni_macaddr). 1500 */ 1501 } 1502 1503 /* 1504 * Handle an HT STA joining an HT network. 1505 */ 1506 void 1507 ieee80211_node_join_ht(struct ieee80211com *ic, struct ieee80211_node *ni) 1508 { 1509 enum ieee80211_htprot; 1510 1511 /* Update HT protection setting. */ 1512 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0) { 1513 ic->ic_bss->ni_htop1 = IEEE80211_HTPROT_NONHT_MIXED; 1514 if (ic->ic_update_htprot) 1515 ic->ic_update_htprot(ic, ic->ic_bss); 1516 } 1517 } 1518 1519 /* 1520 * Handle a station joining an RSN network. 1521 */ 1522 void 1523 ieee80211_node_join_rsn(struct ieee80211com *ic, struct ieee80211_node *ni) 1524 { 1525 DPRINTF(("station %s associated using proto %d akm 0x%x " 1526 "cipher 0x%x groupcipher 0x%x\n", ether_sprintf(ni->ni_macaddr), 1527 ni->ni_rsnprotos, ni->ni_rsnakms, ni->ni_rsnciphers, 1528 ni->ni_rsngroupcipher)); 1529 1530 ni->ni_rsn_state = RSNA_AUTHENTICATION; 1531 1532 ni->ni_key_count = 0; 1533 ni->ni_port_valid = 0; 1534 ni->ni_flags &= ~IEEE80211_NODE_TXRXPROT; 1535 ni->ni_replaycnt = -1; /* XXX */ 1536 ni->ni_rsn_retries = 0; 1537 ni->ni_rsncipher = ni->ni_rsnciphers; 1538 1539 ni->ni_rsn_state = RSNA_AUTHENTICATION_2; 1540 1541 /* generate a new authenticator nonce (ANonce) */ 1542 arc4random_buf(ni->ni_nonce, EAPOL_KEY_NONCE_LEN); 1543 1544 if (!ieee80211_is_8021x_akm(ni->ni_rsnakms)) { 1545 memcpy(ni->ni_pmk, ic->ic_psk, IEEE80211_PMK_LEN); 1546 ni->ni_flags |= IEEE80211_NODE_PMK; 1547 (void)ieee80211_send_4way_msg1(ic, ni); 1548 } else if (ni->ni_flags & IEEE80211_NODE_PMK) { 1549 /* skip 802.1X auth if a cached PMK was found */ 1550 (void)ieee80211_send_4way_msg1(ic, ni); 1551 } else { 1552 /* no cached PMK found, needs full 802.1X auth */ 1553 ieee80211_needs_auth(ic, ni); 1554 } 1555 } 1556 1557 void 1558 ieee80211_count_longslotsta(void *arg, struct ieee80211_node *ni) 1559 { 1560 int *longslotsta = arg; 1561 1562 if (ni->ni_associd == 0 || ni->ni_state == IEEE80211_STA_COLLECT) 1563 return; 1564 1565 if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) 1566 (*longslotsta)++; 1567 } 1568 1569 void 1570 ieee80211_count_nonerpsta(void *arg, struct ieee80211_node *ni) 1571 { 1572 int *nonerpsta = arg; 1573 1574 if (ni->ni_associd == 0 || ni->ni_state == IEEE80211_STA_COLLECT) 1575 return; 1576 1577 if (!ieee80211_iserp_sta(ni)) 1578 (*nonerpsta)++; 1579 } 1580 1581 void 1582 ieee80211_count_pssta(void *arg, struct ieee80211_node *ni) 1583 { 1584 int *pssta = arg; 1585 1586 if (ni->ni_associd == 0 || ni->ni_state == IEEE80211_STA_COLLECT) 1587 return; 1588 1589 if (ni->ni_pwrsave == IEEE80211_PS_DOZE) 1590 (*pssta)++; 1591 } 1592 1593 void 1594 ieee80211_count_rekeysta(void *arg, struct ieee80211_node *ni) 1595 { 1596 int *rekeysta = arg; 1597 1598 if (ni->ni_associd == 0 || ni->ni_state == IEEE80211_STA_COLLECT) 1599 return; 1600 1601 if (ni->ni_flags & IEEE80211_NODE_REKEY) 1602 (*rekeysta)++; 1603 } 1604 1605 /* 1606 * Handle a station joining an 11g network. 1607 */ 1608 void 1609 ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1610 { 1611 int longslotsta = 0, nonerpsta = 0; 1612 1613 if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 1614 /* 1615 * Joining STA doesn't support short slot time. We must 1616 * disable the use of short slot time for all other associated 1617 * STAs and give the driver a chance to reconfigure the 1618 * hardware. 1619 */ 1620 ieee80211_iterate_nodes(ic, 1621 ieee80211_count_longslotsta, &longslotsta); 1622 if (longslotsta == 1) { 1623 if (ic->ic_caps & IEEE80211_C_SHSLOT) 1624 ieee80211_set_shortslottime(ic, 0); 1625 } 1626 DPRINTF(("[%s] station needs long slot time, count %d\n", 1627 ether_sprintf(ni->ni_macaddr), longslotsta)); 1628 } 1629 1630 if (!ieee80211_iserp_sta(ni)) { 1631 /* 1632 * Joining STA is non-ERP. 1633 */ 1634 ieee80211_iterate_nodes(ic, 1635 ieee80211_count_nonerpsta, &nonerpsta); 1636 DPRINTF(("[%s] station is non-ERP, %d non-ERP " 1637 "stations associated\n", ether_sprintf(ni->ni_macaddr), 1638 nonerpsta)); 1639 /* must enable the use of protection */ 1640 if (ic->ic_protmode != IEEE80211_PROT_NONE) { 1641 DPRINTF(("enable use of protection\n")); 1642 ic->ic_flags |= IEEE80211_F_USEPROT; 1643 } 1644 1645 if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 1646 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1647 } else 1648 ni->ni_flags |= IEEE80211_NODE_ERP; 1649 } 1650 1651 void 1652 ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, 1653 int resp) 1654 { 1655 int newassoc = (ni->ni_state != IEEE80211_STA_ASSOC); 1656 1657 if (ni->ni_associd == 0) { 1658 u_int16_t aid; 1659 1660 /* 1661 * It would be clever to search the bitmap 1662 * more efficiently, but this will do for now. 1663 */ 1664 for (aid = 1; aid < ic->ic_max_aid; aid++) { 1665 if (!IEEE80211_AID_ISSET(aid, 1666 ic->ic_aid_bitmap)) 1667 break; 1668 } 1669 if (aid >= ic->ic_max_aid) { 1670 IEEE80211_SEND_MGMT(ic, ni, resp, 1671 IEEE80211_REASON_ASSOC_TOOMANY); 1672 ieee80211_node_leave(ic, ni); 1673 return; 1674 } 1675 ni->ni_associd = aid | 0xc000; 1676 IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap); 1677 if (ic->ic_curmode == IEEE80211_MODE_11G || 1678 (ic->ic_curmode == IEEE80211_MODE_11N && 1679 IEEE80211_IS_CHAN_2GHZ(ic->ic_bss->ni_chan))) 1680 ieee80211_node_join_11g(ic, ni); 1681 } 1682 1683 DPRINTF(("station %s %s associated at aid %d\n", 1684 ether_sprintf(ni->ni_macaddr), newassoc ? "newly" : "already", 1685 ni->ni_associd & ~0xc000)); 1686 1687 ieee80211_ht_negotiate(ic, ni); 1688 if (ic->ic_flags & IEEE80211_F_HTON) 1689 ieee80211_node_join_ht(ic, ni); 1690 1691 /* give driver a chance to setup state like ni_txrate */ 1692 if (ic->ic_newassoc) 1693 (*ic->ic_newassoc)(ic, ni, newassoc); 1694 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS); 1695 ieee80211_node_newstate(ni, IEEE80211_STA_ASSOC); 1696 1697 if (!(ic->ic_flags & IEEE80211_F_RSNON)) { 1698 ni->ni_port_valid = 1; 1699 ni->ni_rsncipher = IEEE80211_CIPHER_USEGROUP; 1700 } else 1701 ieee80211_node_join_rsn(ic, ni); 1702 1703 #if NBRIDGE > 0 1704 /* 1705 * If the parent interface is a bridgeport, learn 1706 * the node's address dynamically on this interface. 1707 */ 1708 if (ic->ic_if.if_bridgeport != NULL) 1709 bridge_update(&ic->ic_if, 1710 (struct ether_addr *)ni->ni_macaddr, 0); 1711 #endif 1712 } 1713 1714 /* 1715 * Handle an HT STA leaving an HT network. 1716 */ 1717 void 1718 ieee80211_node_leave_ht(struct ieee80211com *ic, struct ieee80211_node *ni) 1719 { 1720 struct ieee80211_rx_ba *ba; 1721 u_int8_t tid; 1722 int i; 1723 1724 /* free all Block Ack records */ 1725 ieee80211_ba_del(ni); 1726 for (tid = 0; tid < IEEE80211_NUM_TID; tid++) { 1727 ba = &ni->ni_rx_ba[tid]; 1728 if (ba->ba_buf != NULL) { 1729 for (i = 0; i < IEEE80211_BA_MAX_WINSZ; i++) 1730 m_freem(ba->ba_buf[i].m); 1731 free(ba->ba_buf, M_DEVBUF, 0); 1732 ba->ba_buf = NULL; 1733 } 1734 } 1735 1736 ieee80211_clear_htcaps(ni); 1737 } 1738 1739 /* 1740 * Handle a station leaving an RSN network. 1741 */ 1742 void 1743 ieee80211_node_leave_rsn(struct ieee80211com *ic, struct ieee80211_node *ni) 1744 { 1745 int rekeysta = 0; 1746 1747 ni->ni_rsn_state = RSNA_DISCONNECTED; 1748 1749 ni->ni_rsn_state = RSNA_INITIALIZE; 1750 if (ni->ni_flags & IEEE80211_NODE_REKEY) { 1751 ni->ni_flags &= ~IEEE80211_NODE_REKEY; 1752 ieee80211_iterate_nodes(ic, 1753 ieee80211_count_rekeysta, &rekeysta); 1754 if (rekeysta == 0) 1755 ieee80211_setkeysdone(ic); 1756 } 1757 ni->ni_flags &= ~IEEE80211_NODE_PMK; 1758 ni->ni_rsn_gstate = RSNA_IDLE; 1759 1760 timeout_del(&ni->ni_eapol_to); 1761 timeout_del(&ni->ni_sa_query_to); 1762 1763 ni->ni_rsn_retries = 0; 1764 ni->ni_flags &= ~IEEE80211_NODE_TXRXPROT; 1765 ni->ni_port_valid = 0; 1766 (*ic->ic_delete_key)(ic, ni, &ni->ni_pairwise_key); 1767 } 1768 1769 /* 1770 * Handle a station leaving an 11g network. 1771 */ 1772 void 1773 ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1774 { 1775 int longslotsta = 0, nonerpsta = 0; 1776 1777 if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 1778 /* leaving STA did not support short slot time */ 1779 ieee80211_iterate_nodes(ic, 1780 ieee80211_count_longslotsta, &longslotsta); 1781 if (longslotsta == 1) { 1782 /* 1783 * All associated STAs now support short slot time, so 1784 * enable this feature and give the driver a chance to 1785 * reconfigure the hardware. Notice that IBSS always 1786 * use a long slot time. 1787 */ 1788 if ((ic->ic_caps & IEEE80211_C_SHSLOT) && 1789 ic->ic_opmode != IEEE80211_M_IBSS) 1790 ieee80211_set_shortslottime(ic, 1); 1791 } 1792 DPRINTF(("[%s] long slot time station leaves, count %d\n", 1793 ether_sprintf(ni->ni_macaddr), longslotsta)); 1794 } 1795 1796 if (!(ni->ni_flags & IEEE80211_NODE_ERP)) { 1797 /* leaving STA was non-ERP */ 1798 ieee80211_iterate_nodes(ic, 1799 ieee80211_count_nonerpsta, &nonerpsta); 1800 if (nonerpsta == 1) { 1801 /* 1802 * All associated STAs are now ERP capable, disable use 1803 * of protection and re-enable short preamble support. 1804 */ 1805 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1806 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 1807 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1808 } 1809 DPRINTF(("[%s] non-ERP station leaves, count %d\n", 1810 ether_sprintf(ni->ni_macaddr), nonerpsta)); 1811 } 1812 } 1813 1814 /* 1815 * Handle bookkeeping for station deauthentication/disassociation 1816 * when operating as an ap. 1817 */ 1818 void 1819 ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 1820 { 1821 if (ic->ic_opmode != IEEE80211_M_HOSTAP) 1822 panic("not in ap mode, mode %u", ic->ic_opmode); 1823 1824 if (ni->ni_state == IEEE80211_STA_COLLECT) 1825 return; 1826 /* 1827 * If node wasn't previously associated all we need to do is 1828 * reclaim the reference. 1829 */ 1830 if (ni->ni_associd == 0) { 1831 ieee80211_node_newstate(ni, IEEE80211_STA_COLLECT); 1832 return; 1833 } 1834 1835 if (ni->ni_pwrsave == IEEE80211_PS_DOZE) 1836 ni->ni_pwrsave = IEEE80211_PS_AWAKE; 1837 1838 if (mq_purge(&ni->ni_savedq) > 0) { 1839 if (ic->ic_set_tim != NULL) 1840 (*ic->ic_set_tim)(ic, ni->ni_associd, 0); 1841 } 1842 1843 if (ic->ic_flags & IEEE80211_F_RSNON) 1844 ieee80211_node_leave_rsn(ic, ni); 1845 1846 if (ic->ic_curmode == IEEE80211_MODE_11G || 1847 (ic->ic_curmode == IEEE80211_MODE_11N && 1848 IEEE80211_IS_CHAN_2GHZ(ic->ic_bss->ni_chan))) 1849 ieee80211_node_leave_11g(ic, ni); 1850 1851 if (ni->ni_flags & IEEE80211_NODE_HT) 1852 ieee80211_node_leave_ht(ic, ni); 1853 1854 if (ic->ic_node_leave != NULL) 1855 (*ic->ic_node_leave)(ic, ni); 1856 1857 ieee80211_node_newstate(ni, IEEE80211_STA_COLLECT); 1858 1859 #if NBRIDGE > 0 1860 /* 1861 * If the parent interface is a bridgeport, delete 1862 * any dynamically learned address for this node. 1863 */ 1864 if (ic->ic_if.if_bridgeport != NULL) 1865 bridge_update(&ic->ic_if, 1866 (struct ether_addr *)ni->ni_macaddr, 1); 1867 #endif 1868 } 1869 1870 static int 1871 ieee80211_do_slow_print(struct ieee80211com *ic, int *did_print) 1872 { 1873 static const struct timeval merge_print_intvl = { 1874 .tv_sec = 1, .tv_usec = 0 1875 }; 1876 if ((ic->ic_if.if_flags & IFF_LINK0) == 0) 1877 return 0; 1878 if (!*did_print && (ic->ic_if.if_flags & IFF_DEBUG) == 0 && 1879 !ratecheck(&ic->ic_last_merge_print, &merge_print_intvl)) 1880 return 0; 1881 1882 *did_print = 1; 1883 return 1; 1884 } 1885 1886 /* ieee80211_ibss_merge helps merge 802.11 ad hoc networks. The 1887 * convention, set by the Wireless Ethernet Compatibility Alliance 1888 * (WECA), is that an 802.11 station will change its BSSID to match 1889 * the "oldest" 802.11 ad hoc network, on the same channel, that 1890 * has the station's desired SSID. The "oldest" 802.11 network 1891 * sends beacons with the greatest TSF timestamp. 1892 * 1893 * Return ENETRESET if the BSSID changed, 0 otherwise. 1894 * 1895 * XXX Perhaps we should compensate for the time that elapses 1896 * between the MAC receiving the beacon and the host processing it 1897 * in ieee80211_ibss_merge. 1898 */ 1899 int 1900 ieee80211_ibss_merge(struct ieee80211com *ic, struct ieee80211_node *ni, 1901 u_int64_t local_tsft) 1902 { 1903 u_int64_t beacon_tsft; 1904 int did_print = 0, sign; 1905 union { 1906 u_int64_t word; 1907 u_int8_t tstamp[8]; 1908 } u; 1909 1910 /* ensure alignment */ 1911 (void)memcpy(&u, &ni->ni_tstamp[0], sizeof(u)); 1912 beacon_tsft = letoh64(u.word); 1913 1914 /* we are faster, let the other guy catch up */ 1915 if (beacon_tsft < local_tsft) 1916 sign = -1; 1917 else 1918 sign = 1; 1919 1920 if (IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) { 1921 if (!ieee80211_do_slow_print(ic, &did_print)) 1922 return 0; 1923 printf("%s: tsft offset %s%llu\n", ic->ic_if.if_xname, 1924 (sign < 0) ? "-" : "", 1925 (sign < 0) 1926 ? (local_tsft - beacon_tsft) 1927 : (beacon_tsft - local_tsft)); 1928 return 0; 1929 } 1930 1931 if (sign < 0) 1932 return 0; 1933 1934 if (ieee80211_match_bss(ic, ni) != 0) 1935 return 0; 1936 1937 if (ieee80211_do_slow_print(ic, &did_print)) { 1938 printf("%s: ieee80211_ibss_merge: bssid mismatch %s\n", 1939 ic->ic_if.if_xname, ether_sprintf(ni->ni_bssid)); 1940 printf("%s: my tsft %llu beacon tsft %llu\n", 1941 ic->ic_if.if_xname, local_tsft, beacon_tsft); 1942 printf("%s: sync TSF with %s\n", 1943 ic->ic_if.if_xname, ether_sprintf(ni->ni_macaddr)); 1944 } 1945 1946 ic->ic_flags &= ~IEEE80211_F_SIBSS; 1947 1948 /* negotiate rates with new IBSS */ 1949 ieee80211_fix_rate(ic, ni, IEEE80211_F_DOFRATE | 1950 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1951 if (ni->ni_rates.rs_nrates == 0) { 1952 if (ieee80211_do_slow_print(ic, &did_print)) { 1953 printf("%s: rates mismatch, BSSID %s\n", 1954 ic->ic_if.if_xname, ether_sprintf(ni->ni_bssid)); 1955 } 1956 return 0; 1957 } 1958 1959 if (ieee80211_do_slow_print(ic, &did_print)) { 1960 printf("%s: sync BSSID %s -> ", 1961 ic->ic_if.if_xname, ether_sprintf(ic->ic_bss->ni_bssid)); 1962 printf("%s ", ether_sprintf(ni->ni_bssid)); 1963 printf("(from %s)\n", ether_sprintf(ni->ni_macaddr)); 1964 } 1965 1966 ieee80211_node_newstate(ni, IEEE80211_STA_BSS); 1967 (*ic->ic_node_copy)(ic, ic->ic_bss, ni); 1968 1969 return ENETRESET; 1970 } 1971 1972 void 1973 ieee80211_set_tim(struct ieee80211com *ic, int aid, int set) 1974 { 1975 if (set) 1976 setbit(ic->ic_tim_bitmap, aid & ~0xc000); 1977 else 1978 clrbit(ic->ic_tim_bitmap, aid & ~0xc000); 1979 } 1980 1981 /* 1982 * This function shall be called by drivers immediately after every DTIM. 1983 * Transmit all group addressed MSDUs buffered at the AP. 1984 */ 1985 void 1986 ieee80211_notify_dtim(struct ieee80211com *ic) 1987 { 1988 /* NB: group addressed MSDUs are buffered in ic_bss */ 1989 struct ieee80211_node *ni = ic->ic_bss; 1990 struct ifnet *ifp = &ic->ic_if; 1991 struct ieee80211_frame *wh; 1992 struct mbuf *m; 1993 1994 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP); 1995 1996 while ((m = mq_dequeue(&ni->ni_savedq)) != NULL) { 1997 if (!mq_empty(&ni->ni_savedq)) { 1998 /* more queued frames, set the more data bit */ 1999 wh = mtod(m, struct ieee80211_frame *); 2000 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 2001 } 2002 mq_enqueue(&ic->ic_pwrsaveq, m); 2003 if_start(ifp); 2004 } 2005 /* XXX assumes everything has been sent */ 2006 ic->ic_tim_mcast_pending = 0; 2007 } 2008 #endif /* IEEE80211_STA_ONLY */ 2009 2010 /* 2011 * Compare nodes in the tree by lladdr 2012 */ 2013 int 2014 ieee80211_node_cmp(const struct ieee80211_node *b1, 2015 const struct ieee80211_node *b2) 2016 { 2017 return (memcmp(b1->ni_macaddr, b2->ni_macaddr, IEEE80211_ADDR_LEN)); 2018 } 2019 2020 /* 2021 * Generate red-black tree function logic 2022 */ 2023 RBT_GENERATE(ieee80211_tree, ieee80211_node, ni_node, ieee80211_node_cmp); 2024