ieee80211_node.c revision 127766
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * Alternatively, this software may be distributed under the terms of the 18 * GNU General Public License ("GPL") version 2 as published by the Free 19 * Software Foundation. 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 <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_node.c 127766 2004-04-02 22:56:09Z sam $"); 35 36#include "opt_inet.h" 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/mbuf.h> 41#include <sys/malloc.h> 42#include <sys/kernel.h> 43#include <sys/socket.h> 44#include <sys/sockio.h> 45#include <sys/endian.h> 46#include <sys/errno.h> 47#include <sys/bus.h> 48#include <sys/proc.h> 49#include <sys/sysctl.h> 50 51#include <machine/atomic.h> 52 53#include <net/if.h> 54#include <net/if_dl.h> 55#include <net/if_media.h> 56#include <net/if_arp.h> 57#include <net/ethernet.h> 58#include <net/if_llc.h> 59 60#include <net80211/ieee80211_var.h> 61 62#include <net/bpf.h> 63 64#ifdef INET 65#include <netinet/in.h> 66#include <netinet/if_ether.h> 67#endif 68 69static struct ieee80211_node *ieee80211_node_alloc(struct ieee80211com *); 70static void ieee80211_node_free(struct ieee80211com *, struct ieee80211_node *); 71static void ieee80211_node_copy(struct ieee80211com *, 72 struct ieee80211_node *, const struct ieee80211_node *); 73static u_int8_t ieee80211_node_getrssi(struct ieee80211com *, 74 struct ieee80211_node *); 75 76static void ieee80211_setup_node(struct ieee80211com *ic, 77 struct ieee80211_node *ni, u_int8_t *macaddr); 78static void _ieee80211_free_node(struct ieee80211com *, 79 struct ieee80211_node *); 80 81MALLOC_DEFINE(M_80211_NODE, "node", "802.11 node state"); 82 83void 84ieee80211_node_attach(struct ifnet *ifp) 85{ 86 struct ieee80211com *ic = (void *)ifp; 87 88 /* XXX need unit */ 89 IEEE80211_NODE_LOCK_INIT(ic, ifp->if_xname); 90 TAILQ_INIT(&ic->ic_node); 91 ic->ic_node_alloc = ieee80211_node_alloc; 92 ic->ic_node_free = ieee80211_node_free; 93 ic->ic_node_copy = ieee80211_node_copy; 94 ic->ic_node_getrssi = ieee80211_node_getrssi; 95 ic->ic_scangen = 1; 96} 97 98void 99ieee80211_node_lateattach(struct ifnet *ifp) 100{ 101 struct ieee80211com *ic = (void *)ifp; 102 struct ieee80211_node *ni; 103 104 ni = (*ic->ic_node_alloc)(ic); 105 KASSERT(ni != NULL, ("unable to setup inital BSS node")); 106 ni->ni_chan = IEEE80211_CHAN_ANYC; 107 ic->ic_bss = ni; 108 ic->ic_txpower = IEEE80211_TXPOWER_MAX; 109} 110 111void 112ieee80211_node_detach(struct ifnet *ifp) 113{ 114 struct ieee80211com *ic = (void *)ifp; 115 116 if (ic->ic_bss != NULL) 117 (*ic->ic_node_free)(ic, ic->ic_bss); 118 ieee80211_free_allnodes(ic); 119 IEEE80211_NODE_LOCK_DESTROY(ic); 120} 121 122/* 123 * AP scanning support. 124 */ 125 126/* 127 * Initialize the active channel set based on the set 128 * of available channels and the current PHY mode. 129 */ 130static void 131ieee80211_reset_scan(struct ifnet *ifp) 132{ 133 struct ieee80211com *ic = (void *)ifp; 134 135 memcpy(ic->ic_chan_scan, ic->ic_chan_active, 136 sizeof(ic->ic_chan_active)); 137 /* NB: hack, setup so next_scan starts with the first channel */ 138 if (ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC) 139 ic->ic_bss->ni_chan = &ic->ic_channels[IEEE80211_CHAN_MAX]; 140} 141 142/* 143 * Begin an active scan. 144 */ 145void 146ieee80211_begin_scan(struct ifnet *ifp) 147{ 148 struct ieee80211com *ic = (void *)ifp; 149 150 /* 151 * In all but hostap mode scanning starts off in 152 * an active mode before switching to passive. 153 */ 154 if (ic->ic_opmode != IEEE80211_M_HOSTAP) { 155 ic->ic_flags |= IEEE80211_F_ASCAN; 156 ic->ic_stats.is_scan_active++; 157 } else 158 ic->ic_stats.is_scan_passive++; 159 if (ifp->if_flags & IFF_DEBUG) 160 if_printf(ifp, "begin %s scan\n", 161 (ic->ic_flags & IEEE80211_F_ASCAN) ? 162 "active" : "passive"); 163 /* 164 * Clear scan state and flush any previously seen 165 * AP's. Note that the latter assumes we don't act 166 * as both an AP and a station, otherwise we'll 167 * potentially flush state of stations associated 168 * with us. 169 */ 170 ieee80211_reset_scan(ifp); 171 ieee80211_free_allnodes(ic); 172 173 /* Scan the next channel. */ 174 ieee80211_next_scan(ifp); 175} 176 177/* 178 * Switch to the next channel marked for scanning. 179 */ 180void 181ieee80211_next_scan(struct ifnet *ifp) 182{ 183 struct ieee80211com *ic = (void *)ifp; 184 struct ieee80211_channel *chan; 185 186 chan = ic->ic_bss->ni_chan; 187 for (;;) { 188 if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) 189 chan = &ic->ic_channels[0]; 190 if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { 191 /* 192 * Honor channels marked passive-only 193 * during an active scan. 194 */ 195 if ((ic->ic_flags & IEEE80211_F_ASCAN) == 0 || 196 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) 197 break; 198 } 199 if (chan == ic->ic_bss->ni_chan) { 200 ieee80211_end_scan(ifp); 201 return; 202 } 203 } 204 clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); 205 IEEE80211_DPRINTF(("ieee80211_next_scan: chan %d->%d\n", 206 ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan), 207 ieee80211_chan2ieee(ic, chan))); 208 ic->ic_bss->ni_chan = chan; 209 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 210} 211 212void 213ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) 214{ 215 struct ieee80211_node *ni; 216 struct ifnet *ifp = &ic->ic_if; 217 218 ni = ic->ic_bss; 219 if (ifp->if_flags & IFF_DEBUG) 220 if_printf(ifp, "creating ibss\n"); 221 ic->ic_flags |= IEEE80211_F_SIBSS; 222 ni->ni_chan = chan; 223 ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)]; 224 IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr); 225 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); 226 if (ic->ic_opmode == IEEE80211_M_IBSS) 227 ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ 228 ni->ni_esslen = ic->ic_des_esslen; 229 memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); 230 ni->ni_rssi = 0; 231 ni->ni_rstamp = 0; 232 memset(ni->ni_tstamp, 0, sizeof(ni->ni_tstamp)); 233 ni->ni_intval = ic->ic_lintval; 234 ni->ni_capinfo = IEEE80211_CAPINFO_IBSS; 235 if (ic->ic_flags & IEEE80211_F_WEPON) 236 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; 237 if (ic->ic_phytype == IEEE80211_T_FH) { 238 ni->ni_fhdwell = 200; /* XXX */ 239 ni->ni_fhindex = 1; 240 } 241 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 242} 243 244/* 245 * Complete a scan of potential channels. 246 */ 247void 248ieee80211_end_scan(struct ifnet *ifp) 249{ 250 struct ieee80211com *ic = (void *)ifp; 251 struct ieee80211_node *ni, *nextbs, *selbs; 252 u_int8_t rate; 253 int i, fail; 254 255 ic->ic_flags &= ~IEEE80211_F_ASCAN; 256 ni = TAILQ_FIRST(&ic->ic_node); 257 258 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 259 /* XXX off stack? */ 260 u_char occupied[roundup(IEEE80211_CHAN_MAX, NBBY)]; 261 /* 262 * The passive scan to look for existing AP's completed, 263 * select a channel to camp on. Identify the channels 264 * that already have one or more AP's and try to locate 265 * an unnoccupied one. If that fails, pick a random 266 * channel from the active set. 267 */ 268 for (; ni != NULL; ni = nextbs) { 269 ieee80211_ref_node(ni); 270 nextbs = TAILQ_NEXT(ni, ni_list); 271 setbit(occupied, ieee80211_chan2ieee(ic, ni->ni_chan)); 272 ieee80211_free_node(ic, ni); 273 } 274 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 275 if (isset(ic->ic_chan_active, i) && isclr(occupied, i)) 276 break; 277 if (i == IEEE80211_CHAN_MAX) { 278 fail = arc4random() & 3; /* random 0-3 */ 279 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 280 if (isset(ic->ic_chan_active, i) && fail-- == 0) 281 break; 282 } 283 ieee80211_create_ibss(ic, &ic->ic_channels[i]); 284 return; 285 } 286 if (ni == NULL) { 287 IEEE80211_DPRINTF(("%s: no scan candidate\n", __func__)); 288 notfound: 289 if (ic->ic_opmode == IEEE80211_M_IBSS && 290 (ic->ic_flags & IEEE80211_F_IBSSON) && 291 ic->ic_des_esslen != 0) { 292 ieee80211_create_ibss(ic, ic->ic_ibss_chan); 293 return; 294 } 295 /* 296 * Reset the list of channels to scan and start again. 297 */ 298 ieee80211_reset_scan(ifp); 299 ieee80211_next_scan(ifp); 300 return; 301 } 302 selbs = NULL; 303 if (ifp->if_flags & IFF_DEBUG) 304 if_printf(ifp, "\tmacaddr bssid chan rssi rate flag wep essid\n"); 305 for (; ni != NULL; ni = nextbs) { 306 ieee80211_ref_node(ni); 307 nextbs = TAILQ_NEXT(ni, ni_list); 308 if (ni->ni_fails) { 309 /* 310 * The configuration of the access points may change 311 * during my scan. So delete the entry for the AP 312 * and retry to associate if there is another beacon. 313 */ 314 if (ni->ni_fails++ > 2) 315 ieee80211_free_node(ic, ni); 316 continue; 317 } 318 fail = 0; 319 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) 320 fail |= 0x01; 321 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 322 ni->ni_chan != ic->ic_des_chan) 323 fail |= 0x01; 324 if (ic->ic_opmode == IEEE80211_M_IBSS) { 325 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 326 fail |= 0x02; 327 } else { 328 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) 329 fail |= 0x02; 330 } 331 if (ic->ic_flags & IEEE80211_F_WEPON) { 332 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 333 fail |= 0x04; 334 } else { 335 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) 336 fail |= 0x04; 337 } 338 rate = ieee80211_fix_rate(ic, ni, IEEE80211_F_DONEGO); 339 if (rate & IEEE80211_RATE_BASIC) 340 fail |= 0x08; 341 if (ic->ic_des_esslen != 0 && 342 (ni->ni_esslen != ic->ic_des_esslen || 343 memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0)) 344 fail |= 0x10; 345 if ((ic->ic_flags & IEEE80211_F_DESBSSID) && 346 !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) 347 fail |= 0x20; 348 if (ifp->if_flags & IFF_DEBUG) { 349 printf(" %c %s", fail ? '-' : '+', 350 ether_sprintf(ni->ni_macaddr)); 351 printf(" %s%c", ether_sprintf(ni->ni_bssid), 352 fail & 0x20 ? '!' : ' '); 353 printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), 354 fail & 0x01 ? '!' : ' '); 355 printf(" %+4d", ni->ni_rssi); 356 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 357 fail & 0x08 ? '!' : ' '); 358 printf(" %4s%c", 359 (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 360 (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 361 "????", 362 fail & 0x02 ? '!' : ' '); 363 printf(" %3s%c ", 364 (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 365 "wep" : "no", 366 fail & 0x04 ? '!' : ' '); 367 ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); 368 printf("%s\n", fail & 0x10 ? "!" : ""); 369 } 370 if (!fail) { 371 if (selbs == NULL) 372 selbs = ni; 373 else if (ni->ni_rssi > selbs->ni_rssi) { 374 ieee80211_unref_node(&selbs); 375 selbs = ni; 376 } else 377 ieee80211_unref_node(&ni); 378 } else { 379 ieee80211_unref_node(&ni); 380 } 381 } 382 if (selbs == NULL) 383 goto notfound; 384 (*ic->ic_node_copy)(ic, ic->ic_bss, selbs); 385 if (ic->ic_opmode == IEEE80211_M_IBSS) { 386 ieee80211_fix_rate(ic, ic->ic_bss, IEEE80211_F_DOFRATE | 387 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 388 if (ic->ic_bss->ni_rates.rs_nrates == 0) { 389 selbs->ni_fails++; 390 ieee80211_unref_node(&selbs); 391 goto notfound; 392 } 393 ieee80211_unref_node(&selbs); 394 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 395 } else { 396 ieee80211_unref_node(&selbs); 397 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 398 } 399} 400 401static struct ieee80211_node * 402ieee80211_node_alloc(struct ieee80211com *ic) 403{ 404 return malloc(sizeof(struct ieee80211_node), M_80211_NODE, 405 M_NOWAIT | M_ZERO); 406} 407 408static void 409ieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni) 410{ 411 free(ni, M_80211_NODE); 412} 413 414static void 415ieee80211_node_copy(struct ieee80211com *ic, 416 struct ieee80211_node *dst, const struct ieee80211_node *src) 417{ 418 *dst = *src; 419} 420 421static u_int8_t 422ieee80211_node_getrssi(struct ieee80211com *ic, struct ieee80211_node *ni) 423{ 424 return ni->ni_rssi; 425} 426 427static void 428ieee80211_setup_node(struct ieee80211com *ic, 429 struct ieee80211_node *ni, u_int8_t *macaddr) 430{ 431 int hash; 432 433 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 434 hash = IEEE80211_NODE_HASH(macaddr); 435 ni->ni_refcnt = 1; /* mark referenced */ 436 IEEE80211_NODE_LOCK(ic); 437 TAILQ_INSERT_TAIL(&ic->ic_node, ni, ni_list); 438 LIST_INSERT_HEAD(&ic->ic_hash[hash], ni, ni_hash); 439 /* 440 * Note we don't enable the inactive timer when acting 441 * as a station. Nodes created in this mode represent 442 * AP's identified while scanning. If we time them out 443 * then several things happen: we can't return the data 444 * to users to show the list of AP's we encountered, and 445 * more importantly, we'll incorrectly deauthenticate 446 * ourself because the inactivity timer will kick us off. 447 */ 448 if (ic->ic_opmode != IEEE80211_M_STA) 449 ic->ic_inact_timer = IEEE80211_INACT_WAIT; 450 IEEE80211_NODE_UNLOCK(ic); 451} 452 453struct ieee80211_node * 454ieee80211_alloc_node(struct ieee80211com *ic, u_int8_t *macaddr) 455{ 456 struct ieee80211_node *ni = (*ic->ic_node_alloc)(ic); 457 if (ni != NULL) 458 ieee80211_setup_node(ic, ni, macaddr); 459 return ni; 460} 461 462struct ieee80211_node * 463ieee80211_dup_bss(struct ieee80211com *ic, u_int8_t *macaddr) 464{ 465 struct ieee80211_node *ni = (*ic->ic_node_alloc)(ic); 466 if (ni != NULL) { 467 memcpy(ni, ic->ic_bss, sizeof(struct ieee80211_node)); 468 ieee80211_setup_node(ic, ni, macaddr); 469 } 470 return ni; 471} 472 473struct ieee80211_node * 474ieee80211_find_node(struct ieee80211com *ic, u_int8_t *macaddr) 475{ 476 struct ieee80211_node *ni; 477 int hash; 478 479 hash = IEEE80211_NODE_HASH(macaddr); 480 IEEE80211_NODE_LOCK(ic); 481 LIST_FOREACH(ni, &ic->ic_hash[hash], ni_hash) { 482 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) { 483 atomic_add_int(&ni->ni_refcnt, 1); /* mark referenced */ 484 break; 485 } 486 } 487 IEEE80211_NODE_UNLOCK(ic); 488 return ni; 489} 490 491/* 492 * Like find but search based on the channel too. 493 */ 494struct ieee80211_node * 495ieee80211_lookup_node(struct ieee80211com *ic, 496 u_int8_t *macaddr, struct ieee80211_channel *chan) 497{ 498 struct ieee80211_node *ni; 499 int hash; 500 501 hash = IEEE80211_NODE_HASH(macaddr); 502 IEEE80211_NODE_LOCK(ic); 503 LIST_FOREACH(ni, &ic->ic_hash[hash], ni_hash) { 504 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && ni->ni_chan == chan) { 505 atomic_add_int(&ni->ni_refcnt, 1);/* mark referenced */ 506 break; 507 } 508 } 509 IEEE80211_NODE_UNLOCK(ic); 510 return ni; 511} 512 513static void 514_ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 515{ 516 KASSERT(ni != ic->ic_bss, ("freeing bss node")); 517 518 TAILQ_REMOVE(&ic->ic_node, ni, ni_list); 519 LIST_REMOVE(ni, ni_hash); 520 if (TAILQ_EMPTY(&ic->ic_node)) 521 ic->ic_inact_timer = 0; 522 (*ic->ic_node_free)(ic, ni); 523} 524 525void 526ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 527{ 528 KASSERT(ni != ic->ic_bss, ("freeing ic_bss")); 529 530 /* XXX need equivalent of atomic_dec_and_test */ 531 atomic_subtract_int(&ni->ni_refcnt, 1); 532 if (atomic_cmpset_int(&ni->ni_refcnt, 0, 1)) { 533 IEEE80211_NODE_LOCK(ic); 534 _ieee80211_free_node(ic, ni); 535 IEEE80211_NODE_UNLOCK(ic); 536 } 537} 538 539void 540ieee80211_free_allnodes(struct ieee80211com *ic) 541{ 542 struct ieee80211_node *ni; 543 544 IEEE80211_NODE_LOCK(ic); 545 while ((ni = TAILQ_FIRST(&ic->ic_node)) != NULL) 546 _ieee80211_free_node(ic, ni); 547 IEEE80211_NODE_UNLOCK(ic); 548} 549 550/* 551 * Timeout inactive nodes. Note that we cannot hold the node 552 * lock while sending a frame as this would lead to a LOR. 553 * Instead we use a generation number to mark nodes that we've 554 * scanned and drop the lock and restart a scan if we have to 555 * time out a node. Since we are single-threaded by virtue of 556 * controlling the inactivity timer we can be sure this will 557 * process each node only once. 558 */ 559void 560ieee80211_timeout_nodes(struct ieee80211com *ic) 561{ 562 struct ieee80211_node *ni; 563 u_int gen = ic->ic_scangen++; /* NB: ok 'cuz single-threaded*/ 564 565restart: 566 IEEE80211_NODE_LOCK(ic); 567 TAILQ_FOREACH(ni, &ic->ic_node, ni_list) { 568 if (ni->ni_scangen == gen) /* previously handled */ 569 continue; 570 ni->ni_scangen = gen; 571 if (++ni->ni_inact > IEEE80211_INACT_MAX) { 572 IEEE80211_DPRINTF(("station %s timed out " 573 "due to inactivity (%u secs)\n", 574 ether_sprintf(ni->ni_macaddr), 575 ni->ni_inact)); 576 /* 577 * Send a deauthenticate frame. 578 * 579 * Drop the node lock before sending the 580 * deauthentication frame in case the driver takes 581 * a lock, as this will result in a LOR between the 582 * node lock and the driver lock. 583 */ 584 IEEE80211_NODE_UNLOCK(ic); 585 IEEE80211_SEND_MGMT(ic, ni, 586 IEEE80211_FC0_SUBTYPE_DEAUTH, 587 IEEE80211_REASON_AUTH_EXPIRE); 588 ieee80211_free_node(ic, ni); 589 ic->ic_stats.is_node_timeout++; 590 goto restart; 591 } 592 } 593 if (!TAILQ_EMPTY(&ic->ic_node)) 594 ic->ic_inact_timer = IEEE80211_INACT_WAIT; 595 IEEE80211_NODE_UNLOCK(ic); 596} 597 598void 599ieee80211_iterate_nodes(struct ieee80211com *ic, ieee80211_iter_func *f, void *arg) 600{ 601 struct ieee80211_node *ni; 602 603 IEEE80211_NODE_LOCK(ic); 604 TAILQ_FOREACH(ni, &ic->ic_node, ni_list) 605 (*f)(arg, ni); 606 IEEE80211_NODE_UNLOCK(ic); 607} 608