ieee80211_node.c revision 120483
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 120483 2003-09-26 17:00:44Z 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 mtx_init(&ic->ic_nodelock, ifp->if_name, "802.11 node table", MTX_DEF); 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; 102 103 ic->ic_bss = (*ic->ic_node_alloc)(ic); 104 KASSERT(ic->ic_bss != NULL, ("unable to setup inital BSS node")); 105 ic->ic_bss->ni_chan = IEEE80211_CHAN_ANYC; 106} 107 108void 109ieee80211_node_detach(struct ifnet *ifp) 110{ 111 struct ieee80211com *ic = (void *)ifp; 112 113 if (ic->ic_bss != NULL) 114 (*ic->ic_node_free)(ic, ic->ic_bss); 115 ieee80211_free_allnodes(ic); 116 mtx_destroy(&ic->ic_nodelock); 117} 118 119/* 120 * AP scanning support. 121 */ 122 123/* 124 * Initialize the active channel set based on the set 125 * of available channels and the current PHY mode. 126 */ 127static void 128ieee80211_reset_scan(struct ifnet *ifp) 129{ 130 struct ieee80211com *ic = (void *)ifp; 131 132 memcpy(ic->ic_chan_scan, ic->ic_chan_active, 133 sizeof(ic->ic_chan_active)); 134 /* NB: hack, setup so next_scan starts with the first channel */ 135 if (ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC) 136 ic->ic_bss->ni_chan = &ic->ic_channels[IEEE80211_CHAN_MAX]; 137} 138 139/* 140 * Begin an active scan. 141 */ 142void 143ieee80211_begin_scan(struct ifnet *ifp) 144{ 145 struct ieee80211com *ic = (void *)ifp; 146 147 /* 148 * In all but hostap mode scanning starts off in 149 * an active mode before switching to passive. 150 */ 151 if (ic->ic_opmode != IEEE80211_M_HOSTAP) 152 ic->ic_flags |= IEEE80211_F_ASCAN; 153 if (ifp->if_flags & IFF_DEBUG) 154 if_printf(ifp, "begin %s scan\n", 155 (ic->ic_flags & IEEE80211_F_ASCAN) ? 156 "active" : "passive"); 157 /* 158 * Clear scan state and flush any previously seen 159 * AP's. Note that the latter assumes we don't act 160 * as both an AP and a station, otherwise we'll 161 * potentially flush state of stations associated 162 * with us. 163 */ 164 ieee80211_reset_scan(ifp); 165 ieee80211_free_allnodes(ic); 166 167 /* Scan the next channel. */ 168 ieee80211_next_scan(ifp); 169} 170 171/* 172 * Switch to the next channel marked for scanning. 173 */ 174void 175ieee80211_next_scan(struct ifnet *ifp) 176{ 177 struct ieee80211com *ic = (void *)ifp; 178 struct ieee80211_channel *chan; 179 180 chan = ic->ic_bss->ni_chan; 181 for (;;) { 182 if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) 183 chan = &ic->ic_channels[0]; 184 if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { 185 /* 186 * Honor channels marked passive-only 187 * during an active scan. 188 */ 189 if ((ic->ic_flags & IEEE80211_F_ASCAN) == 0 || 190 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) 191 break; 192 } 193 if (chan == ic->ic_bss->ni_chan) { 194 ieee80211_end_scan(ifp); 195 return; 196 } 197 } 198 clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); 199 IEEE80211_DPRINTF(("ieee80211_next_scan: chan %d->%d\n", 200 ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan), 201 ieee80211_chan2ieee(ic, chan))); 202 ic->ic_bss->ni_chan = chan; 203 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 204} 205 206void 207ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) 208{ 209 struct ieee80211_node *ni; 210 struct ifnet *ifp = &ic->ic_if; 211 212 ni = ic->ic_bss; 213 if (ifp->if_flags & IFF_DEBUG) 214 if_printf(ifp, "creating ibss\n"); 215 ic->ic_flags |= IEEE80211_F_SIBSS; 216 ni->ni_chan = chan; 217 ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)]; 218 IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr); 219 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); 220 if (ic->ic_opmode == IEEE80211_M_IBSS) 221 ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ 222 ni->ni_esslen = ic->ic_des_esslen; 223 memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); 224 ni->ni_rssi = 0; 225 ni->ni_rstamp = 0; 226 memset(ni->ni_tstamp, 0, sizeof(ni->ni_tstamp)); 227 ni->ni_intval = ic->ic_lintval; 228 ni->ni_capinfo = IEEE80211_CAPINFO_IBSS; 229 if (ic->ic_flags & IEEE80211_F_WEPON) 230 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; 231 if (ic->ic_phytype == IEEE80211_T_FH) { 232 ni->ni_fhdwell = 200; /* XXX */ 233 ni->ni_fhindex = 1; 234 } 235 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 236} 237 238/* 239 * Complete a scan of potential channels. 240 */ 241void 242ieee80211_end_scan(struct ifnet *ifp) 243{ 244 struct ieee80211com *ic = (void *)ifp; 245 struct ieee80211_node *ni, *nextbs, *selbs; 246 u_int8_t rate; 247 int i, fail; 248 249 ic->ic_flags &= ~IEEE80211_F_ASCAN; 250 ni = TAILQ_FIRST(&ic->ic_node); 251 252 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 253 /* XXX off stack? */ 254 u_char occupied[roundup(IEEE80211_CHAN_MAX, NBBY)]; 255 /* 256 * The passive scan to look for existing AP's completed, 257 * select a channel to camp on. Identify the channels 258 * that already have one or more AP's and try to locate 259 * an unnoccupied one. If that fails, pick a random 260 * channel from the active set. 261 */ 262 for (; ni != NULL; ni = nextbs) { 263 ieee80211_ref_node(ni); 264 nextbs = TAILQ_NEXT(ni, ni_list); 265 setbit(occupied, ieee80211_chan2ieee(ic, ni->ni_chan)); 266 ieee80211_free_node(ic, ni); 267 } 268 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 269 if (isset(ic->ic_chan_active, i) && isclr(occupied, i)) 270 break; 271 if (i == IEEE80211_CHAN_MAX) { 272 fail = arc4random() & 3; /* random 0-3 */ 273 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 274 if (isset(ic->ic_chan_active, i) && fail-- == 0) 275 break; 276 } 277 ieee80211_create_ibss(ic, &ic->ic_channels[i]); 278 return; 279 } 280 if (ni == NULL) { 281 IEEE80211_DPRINTF(("%s: no scan candidate\n", __func__)); 282 notfound: 283 if (ic->ic_opmode == IEEE80211_M_IBSS && 284 (ic->ic_flags & IEEE80211_F_IBSSON) && 285 ic->ic_des_esslen != 0) { 286 ieee80211_create_ibss(ic, ic->ic_ibss_chan); 287 return; 288 } 289 /* 290 * Reset the list of channels to scan and start again. 291 */ 292 ieee80211_reset_scan(ifp); 293 ieee80211_next_scan(ifp); 294 return; 295 } 296 selbs = NULL; 297 if (ifp->if_flags & IFF_DEBUG) 298 if_printf(ifp, "\tmacaddr bssid chan rssi rate flag wep essid\n"); 299 for (; ni != NULL; ni = nextbs) { 300 ieee80211_ref_node(ni); 301 nextbs = TAILQ_NEXT(ni, ni_list); 302 if (ni->ni_fails) { 303 /* 304 * The configuration of the access points may change 305 * during my scan. So delete the entry for the AP 306 * and retry to associate if there is another beacon. 307 */ 308 if (ni->ni_fails++ > 2) 309 ieee80211_free_node(ic, ni); 310 continue; 311 } 312 fail = 0; 313 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) 314 fail |= 0x01; 315 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 316 ni->ni_chan != ic->ic_des_chan) 317 fail |= 0x01; 318 if (ic->ic_opmode == IEEE80211_M_IBSS) { 319 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 320 fail |= 0x02; 321 } else { 322 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) 323 fail |= 0x02; 324 } 325 if (ic->ic_flags & IEEE80211_F_WEPON) { 326 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 327 fail |= 0x04; 328 } else { 329 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) 330 fail |= 0x04; 331 } 332 rate = ieee80211_fix_rate(ic, ni, IEEE80211_F_DONEGO); 333 if (rate & IEEE80211_RATE_BASIC) 334 fail |= 0x08; 335 if (ic->ic_des_esslen != 0 && 336 (ni->ni_esslen != ic->ic_des_esslen || 337 memcmp(ni->ni_essid, ic->ic_des_essid, 338 ic->ic_des_esslen != 0))) 339 fail |= 0x10; 340 if ((ic->ic_flags & IEEE80211_F_DESBSSID) && 341 !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) 342 fail |= 0x20; 343 if (ifp->if_flags & IFF_DEBUG) { 344 printf(" %c %s", fail ? '-' : '+', 345 ether_sprintf(ni->ni_macaddr)); 346 printf(" %s%c", ether_sprintf(ni->ni_bssid), 347 fail & 0x20 ? '!' : ' '); 348 printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), 349 fail & 0x01 ? '!' : ' '); 350 printf(" %+4d", ni->ni_rssi); 351 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 352 fail & 0x08 ? '!' : ' '); 353 printf(" %4s%c", 354 (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 355 (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 356 "????", 357 fail & 0x02 ? '!' : ' '); 358 printf(" %3s%c ", 359 (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 360 "wep" : "no", 361 fail & 0x04 ? '!' : ' '); 362 ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); 363 printf("%s\n", fail & 0x10 ? "!" : ""); 364 } 365 if (!fail) { 366 if (selbs == NULL) 367 selbs = ni; 368 else if (ni->ni_rssi > selbs->ni_rssi) { 369 ieee80211_unref_node(&selbs); 370 selbs = ni; 371 } else 372 ieee80211_unref_node(&ni); 373 } else { 374 ieee80211_unref_node(&ni); 375 } 376 } 377 if (selbs == NULL) 378 goto notfound; 379 (*ic->ic_node_copy)(ic, ic->ic_bss, selbs); 380 if (ic->ic_opmode == IEEE80211_M_IBSS) { 381 ieee80211_fix_rate(ic, ic->ic_bss, IEEE80211_F_DOFRATE | 382 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 383 if (ic->ic_bss->ni_rates.rs_nrates == 0) { 384 selbs->ni_fails++; 385 ieee80211_unref_node(&selbs); 386 goto notfound; 387 } 388 ieee80211_unref_node(&selbs); 389 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 390 } else { 391 ieee80211_unref_node(&selbs); 392 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 393 } 394} 395 396static struct ieee80211_node * 397ieee80211_node_alloc(struct ieee80211com *ic) 398{ 399 return malloc(sizeof(struct ieee80211_node), M_80211_NODE, 400 M_NOWAIT | M_ZERO); 401} 402 403static void 404ieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni) 405{ 406 free(ni, M_80211_NODE); 407} 408 409static void 410ieee80211_node_copy(struct ieee80211com *ic, 411 struct ieee80211_node *dst, const struct ieee80211_node *src) 412{ 413 *dst = *src; 414} 415 416static u_int8_t 417ieee80211_node_getrssi(struct ieee80211com *ic, struct ieee80211_node *ni) 418{ 419 return ni->ni_rssi; 420} 421 422static void 423ieee80211_setup_node(struct ieee80211com *ic, 424 struct ieee80211_node *ni, u_int8_t *macaddr) 425{ 426 int hash; 427 428 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 429 hash = IEEE80211_NODE_HASH(macaddr); 430 ni->ni_refcnt = 1; /* mark referenced */ 431 mtx_lock(&ic->ic_nodelock); 432 TAILQ_INSERT_TAIL(&ic->ic_node, ni, ni_list); 433 LIST_INSERT_HEAD(&ic->ic_hash[hash], ni, ni_hash); 434 /* 435 * Note we don't enable the inactive timer when acting 436 * as a station. Nodes created in this mode represent 437 * AP's identified while scanning. If we time them out 438 * then several things happen: we can't return the data 439 * to users to show the list of AP's we encountered, and 440 * more importantly, we'll incorrectly deauthenticate 441 * ourself because the inactivity timer will kick us off. 442 */ 443 if (ic->ic_opmode != IEEE80211_M_STA) 444 ic->ic_inact_timer = IEEE80211_INACT_WAIT; 445 mtx_unlock(&ic->ic_nodelock); 446} 447 448struct ieee80211_node * 449ieee80211_alloc_node(struct ieee80211com *ic, u_int8_t *macaddr) 450{ 451 struct ieee80211_node *ni = (*ic->ic_node_alloc)(ic); 452 if (ni != NULL) 453 ieee80211_setup_node(ic, ni, macaddr); 454 return ni; 455} 456 457struct ieee80211_node * 458ieee80211_dup_bss(struct ieee80211com *ic, u_int8_t *macaddr) 459{ 460 struct ieee80211_node *ni = (*ic->ic_node_alloc)(ic); 461 if (ni != NULL) { 462 memcpy(ni, ic->ic_bss, sizeof(struct ieee80211_node)); 463 ieee80211_setup_node(ic, ni, macaddr); 464 } 465 return ni; 466} 467 468struct ieee80211_node * 469ieee80211_find_node(struct ieee80211com *ic, u_int8_t *macaddr) 470{ 471 struct ieee80211_node *ni; 472 int hash; 473 474 hash = IEEE80211_NODE_HASH(macaddr); 475 mtx_lock(&ic->ic_nodelock); 476 LIST_FOREACH(ni, &ic->ic_hash[hash], ni_hash) { 477 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) { 478 atomic_add_int(&ni->ni_refcnt, 1); /* mark referenced */ 479 break; 480 } 481 } 482 mtx_unlock(&ic->ic_nodelock); 483 return ni; 484} 485 486/* 487 * Like find but search based on the channel too. 488 */ 489struct ieee80211_node * 490ieee80211_lookup_node(struct ieee80211com *ic, 491 u_int8_t *macaddr, struct ieee80211_channel *chan) 492{ 493 struct ieee80211_node *ni; 494 int hash; 495 496 hash = IEEE80211_NODE_HASH(macaddr); 497 mtx_lock(&ic->ic_nodelock); 498 LIST_FOREACH(ni, &ic->ic_hash[hash], ni_hash) { 499 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && ni->ni_chan == chan) { 500 atomic_add_int(&ni->ni_refcnt, 1);/* mark referenced */ 501 break; 502 } 503 } 504 mtx_unlock(&ic->ic_nodelock); 505 return ni; 506} 507 508static void 509_ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 510{ 511 KASSERT(ni != ic->ic_bss, ("freeing bss node")); 512 513 TAILQ_REMOVE(&ic->ic_node, ni, ni_list); 514 LIST_REMOVE(ni, ni_hash); 515 if (TAILQ_EMPTY(&ic->ic_node)) 516 ic->ic_inact_timer = 0; 517 (*ic->ic_node_free)(ic, ni); 518} 519 520void 521ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 522{ 523 KASSERT(ni != ic->ic_bss, ("freeing ic_bss")); 524 525 /* XXX need equivalent of atomic_dec_and_test */ 526 atomic_subtract_int(&ni->ni_refcnt, 1); 527 if (atomic_cmpset_int(&ni->ni_refcnt, 0, 1)) { 528 mtx_lock(&ic->ic_nodelock); 529 _ieee80211_free_node(ic, ni); 530 mtx_unlock(&ic->ic_nodelock); 531 } 532} 533 534void 535ieee80211_free_allnodes(struct ieee80211com *ic) 536{ 537 struct ieee80211_node *ni; 538 539 mtx_lock(&ic->ic_nodelock); 540 while ((ni = TAILQ_FIRST(&ic->ic_node)) != NULL) 541 _ieee80211_free_node(ic, ni); 542 mtx_unlock(&ic->ic_nodelock); 543} 544 545/* 546 * Timeout inactive nodes. Note that we cannot hold the node 547 * lock while sending a frame as this would lead to a LOR. 548 * Instead we use a generation number to mark nodes that we've 549 * scanned and drop the lock and restart a scan if we have to 550 * time out a node. Since we are single-threaded by virtue of 551 * controlling the inactivity timer we can be sure this will 552 * process each node only once. 553 */ 554void 555ieee80211_timeout_nodes(struct ieee80211com *ic) 556{ 557 struct ieee80211_node *ni; 558 u_int gen = ic->ic_scangen++; /* NB: ok 'cuz single-threaded*/ 559 560restart: 561 mtx_lock(&ic->ic_nodelock); 562 TAILQ_FOREACH(ni, &ic->ic_node, ni_list) { 563 if (ni->ni_scangen == gen) /* previously handled */ 564 continue; 565 ni->ni_scangen = gen; 566 if (++ni->ni_inact > IEEE80211_INACT_MAX) { 567 IEEE80211_DPRINTF(("station %s timed out " 568 "due to inactivity (%u secs)\n", 569 ether_sprintf(ni->ni_macaddr), 570 ni->ni_inact)); 571 /* 572 * Send a deauthenticate frame. 573 * 574 * Drop the node lock before sending the 575 * deauthentication frame in case the driver takes 576 * a lock, as this will result in a LOR between the 577 * node lock and the driver lock. 578 */ 579 mtx_unlock(&ic->ic_nodelock); 580 IEEE80211_SEND_MGMT(ic, ni, 581 IEEE80211_FC0_SUBTYPE_DEAUTH, 582 IEEE80211_REASON_AUTH_EXPIRE); 583 ieee80211_free_node(ic, ni); 584 goto restart; 585 } 586 } 587 if (!TAILQ_EMPTY(&ic->ic_node)) 588 ic->ic_inact_timer = IEEE80211_INACT_WAIT; 589 mtx_unlock(&ic->ic_nodelock); 590} 591 592void 593ieee80211_iterate_nodes(struct ieee80211com *ic, ieee80211_iter_func *f, void *arg) 594{ 595 struct ieee80211_node *ni; 596 597 mtx_lock(&ic->ic_nodelock); 598 TAILQ_FOREACH(ni, &ic->ic_node, ni_list) 599 (*f)(arg, ni); 600 mtx_unlock(&ic->ic_nodelock); 601} 602