ieee80211_node.c revision 1.3
1 /* $NetBSD: ieee80211_node.c,v 1.3 2003/09/14 01:14:55 dyoung Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * Alternatively, this software may be distributed under the terms of the 19 * GNU General Public License ("GPL") version 2 as published by the Free 20 * Software Foundation. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifdef __FreeBSD__ 36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_node.c,v 1.6 2003/08/19 22:17:03 sam Exp $"); 37 #else 38 __KERNEL_RCSID(0, "$NetBSD: ieee80211_node.c,v 1.3 2003/09/14 01:14:55 dyoung Exp $"); 39 #endif 40 41 #include "opt_inet.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/mbuf.h> 46 #include <sys/malloc.h> 47 #include <sys/kernel.h> 48 #include <sys/socket.h> 49 #include <sys/sockio.h> 50 #include <sys/endian.h> 51 #include <sys/errno.h> 52 #include <sys/bus.h> 53 #include <sys/proc.h> 54 #include <sys/sysctl.h> 55 56 #ifdef __FreeBSD__ 57 #include <machine/atomic.h> 58 #endif 59 60 #include <net/if.h> 61 #include <net/if_dl.h> 62 #include <net/if_media.h> 63 #include <net/if_arp.h> 64 #ifdef __FreeBSD__ 65 #include <net/ethernet.h> 66 #endif 67 #include <net/if_llc.h> 68 69 #include <net80211/ieee80211_var.h> 70 71 #include <net/bpf.h> 72 73 #ifdef INET 74 #include <netinet/in.h> 75 #include <netinet/if_ether.h> 76 #endif 77 78 static struct ieee80211_node *ieee80211_node_alloc(struct ieee80211com *); 79 static void ieee80211_node_free(struct ieee80211com *, struct ieee80211_node *); 80 static void ieee80211_node_copy(struct ieee80211com *, 81 struct ieee80211_node *, const struct ieee80211_node *); 82 static void ieee80211_setup_node(struct ieee80211com *ic, 83 struct ieee80211_node *ni, u_int8_t *macaddr); 84 static void _ieee80211_free_node(struct ieee80211com *, 85 struct ieee80211_node *); 86 87 void 88 ieee80211_node_attach(struct ifnet *ifp) 89 { 90 struct ieee80211com *ic = (void *)ifp; 91 92 #ifdef __FreeBSD__ 93 /* XXX need unit */ 94 mtx_init(&ic->ic_nodelock, ifp->if_name, "802.11 node table", MTX_DEF); 95 #endif 96 TAILQ_INIT(&ic->ic_node); 97 ic->ic_node_alloc = ieee80211_node_alloc; 98 ic->ic_node_free = ieee80211_node_free; 99 ic->ic_node_copy = ieee80211_node_copy; 100 } 101 102 void 103 ieee80211_node_lateattach(struct ifnet *ifp) 104 { 105 struct ieee80211com *ic = (void *)ifp; 106 107 ic->ic_bss = (*ic->ic_node_alloc)(ic); 108 KASSERT(ic->ic_bss != NULL, ("unable to setup inital BSS node")); 109 ic->ic_bss->ni_chan = IEEE80211_CHAN_ANYC; 110 } 111 112 void 113 ieee80211_node_detach(struct ifnet *ifp) 114 { 115 struct ieee80211com *ic = (void *)ifp; 116 117 if (ic->ic_bss != NULL) 118 (*ic->ic_node_free)(ic, ic->ic_bss); 119 ieee80211_free_allnodes(ic); 120 #ifdef __FreeBSD__ 121 mtx_destroy(&ic->ic_nodelock); 122 #endif 123 } 124 125 /* 126 * AP scanning support. 127 */ 128 129 /* 130 * Initialize the active channel set based on the set 131 * of available channels and the current PHY mode. 132 */ 133 static void 134 ieee80211_reset_scan(struct ifnet *ifp) 135 { 136 struct ieee80211com *ic = (void *)ifp; 137 138 memcpy(ic->ic_chan_scan, ic->ic_chan_active, 139 sizeof(ic->ic_chan_active)); 140 /* NB: hack, setup so next_scan starts with the first channel */ 141 if (ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC) 142 ic->ic_bss->ni_chan = &ic->ic_channels[IEEE80211_CHAN_MAX]; 143 } 144 145 /* 146 * Begin an active scan. 147 */ 148 void 149 ieee80211_begin_scan(struct ifnet *ifp) 150 { 151 struct ieee80211com *ic = (void *)ifp; 152 153 /* 154 * In all but hostap mode scanning starts off in 155 * an active mode before switching to passive. 156 */ 157 if (ic->ic_opmode != IEEE80211_M_HOSTAP) 158 ic->ic_flags |= IEEE80211_F_ASCAN; 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 */ 180 void 181 ieee80211_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 } 211 212 void 213 ieee80211_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 */ 247 void 248 ieee80211_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, 344 ic->ic_des_esslen != 0))) 345 fail |= 0x10; 346 if ((ic->ic_flags & IEEE80211_F_DESBSSID) && 347 !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) 348 fail |= 0x20; 349 if (ifp->if_flags & IFF_DEBUG) { 350 printf(" %c %s", fail ? '-' : '+', 351 ether_sprintf(ni->ni_macaddr)); 352 printf(" %s%c", ether_sprintf(ni->ni_bssid), 353 fail & 0x20 ? '!' : ' '); 354 printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), 355 fail & 0x01 ? '!' : ' '); 356 printf(" %+4d", ni->ni_rssi); 357 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 358 fail & 0x08 ? '!' : ' '); 359 printf(" %4s%c", 360 (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 361 (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 362 "????", 363 fail & 0x02 ? '!' : ' '); 364 printf(" %3s%c ", 365 (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 366 "wep" : "no", 367 fail & 0x04 ? '!' : ' '); 368 ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); 369 printf("%s\n", fail & 0x10 ? "!" : ""); 370 } 371 if (!fail) { 372 if (selbs == NULL) 373 selbs = ni; 374 else if (ni->ni_rssi > selbs->ni_rssi) { 375 ieee80211_unref_node(&selbs); 376 selbs = ni; 377 } else 378 ieee80211_unref_node(&ni); 379 } else { 380 ieee80211_unref_node(&ni); 381 } 382 } 383 if (selbs == NULL) 384 goto notfound; 385 (*ic->ic_node_copy)(ic, ic->ic_bss, selbs); 386 if (ic->ic_opmode == IEEE80211_M_IBSS) { 387 ieee80211_fix_rate(ic, ic->ic_bss, IEEE80211_F_DOFRATE | 388 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 389 if (ic->ic_bss->ni_rates.rs_nrates == 0) { 390 selbs->ni_fails++; 391 ieee80211_unref_node(&selbs); 392 goto notfound; 393 } 394 ieee80211_unref_node(&selbs); 395 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 396 } else { 397 ieee80211_unref_node(&selbs); 398 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 399 } 400 } 401 402 static struct ieee80211_node * 403 ieee80211_node_alloc(struct ieee80211com *ic) 404 { 405 return malloc(sizeof(struct ieee80211_node), M_DEVBUF, 406 M_NOWAIT | M_ZERO); 407 } 408 409 static void 410 ieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni) 411 { 412 free(ni, M_DEVBUF); 413 } 414 415 static void 416 ieee80211_node_copy(struct ieee80211com *ic, 417 struct ieee80211_node *dst, const struct ieee80211_node *src) 418 { 419 *dst = *src; 420 } 421 422 static void 423 ieee80211_setup_node(struct ieee80211com *ic, 424 struct ieee80211_node *ni, u_int8_t *macaddr) 425 { 426 int hash; 427 ieee80211_node_critsec_decl(s); 428 429 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 430 hash = IEEE80211_NODE_HASH(macaddr); 431 ni->ni_refcnt = 1; /* mark referenced */ 432 ieee80211_node_critsec_begin(ic, s); 433 TAILQ_INSERT_TAIL(&ic->ic_node, ni, ni_list); 434 LIST_INSERT_HEAD(&ic->ic_hash[hash], ni, ni_hash); 435 /* 436 * Note we don't enable the inactive timer when acting 437 * as a station. Nodes created in this mode represent 438 * AP's identified while scanning. If we time them out 439 * then several things happen: we can't return the data 440 * to users to show the list of AP's we encountered, and 441 * more importantly, we'll incorrectly deauthenticate 442 * ourself because the inactivity timer will kick us off. 443 */ 444 if (ic->ic_opmode != IEEE80211_M_STA) 445 ic->ic_inact_timer = IEEE80211_INACT_WAIT; 446 ieee80211_node_critsec_end(ic, s); 447 } 448 449 struct ieee80211_node * 450 ieee80211_alloc_node(struct ieee80211com *ic, u_int8_t *macaddr) 451 { 452 struct ieee80211_node *ni = (*ic->ic_node_alloc)(ic); 453 if (ni != NULL) 454 ieee80211_setup_node(ic, ni, macaddr); 455 return ni; 456 } 457 458 struct ieee80211_node * 459 ieee80211_dup_bss(struct ieee80211com *ic, u_int8_t *macaddr) 460 { 461 struct ieee80211_node *ni = (*ic->ic_node_alloc)(ic); 462 if (ni != NULL) { 463 memcpy(ni, ic->ic_bss, sizeof(struct ieee80211_node)); 464 ieee80211_setup_node(ic, ni, macaddr); 465 } 466 return ni; 467 } 468 469 struct ieee80211_node * 470 ieee80211_find_node(struct ieee80211com *ic, u_int8_t *macaddr) 471 { 472 struct ieee80211_node *ni; 473 int hash; 474 ieee80211_node_critsec_decl(s); 475 476 hash = IEEE80211_NODE_HASH(macaddr); 477 ieee80211_node_critsec_begin(ic, s); 478 LIST_FOREACH(ni, &ic->ic_hash[hash], ni_hash) { 479 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) { 480 ieee80211_node_incref(ni); /* mark referenced */ 481 break; 482 } 483 } 484 ieee80211_node_critsec_end(ic, s); 485 return ni; 486 } 487 488 /* 489 * Like find but search based on the channel too. 490 */ 491 struct ieee80211_node * 492 ieee80211_lookup_node(struct ieee80211com *ic, 493 u_int8_t *macaddr, struct ieee80211_channel *chan) 494 { 495 struct ieee80211_node *ni; 496 int hash; 497 ieee80211_node_critsec_decl(s); 498 499 hash = IEEE80211_NODE_HASH(macaddr); 500 ieee80211_node_critsec_begin(ic, s); 501 LIST_FOREACH(ni, &ic->ic_hash[hash], ni_hash) { 502 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && ni->ni_chan == chan) { 503 ieee80211_node_incref(ni);/* mark referenced */ 504 break; 505 } 506 } 507 ieee80211_node_critsec_end(ic, s); 508 return ni; 509 } 510 511 static void 512 _ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 513 { 514 KASSERT(ni != ic->ic_bss, ("freeing bss node")); 515 516 TAILQ_REMOVE(&ic->ic_node, ni, ni_list); 517 LIST_REMOVE(ni, ni_hash); 518 if (TAILQ_EMPTY(&ic->ic_node)) 519 ic->ic_inact_timer = 0; 520 (*ic->ic_node_free)(ic, ni); 521 } 522 523 void 524 ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 525 { 526 ieee80211_node_critsec_decl(s); 527 528 KASSERT(ni != ic->ic_bss, ("freeing ic_bss")); 529 530 if (ieee80211_node_decref(ni) == 0) { 531 ieee80211_node_critsec_begin(ic, s); 532 _ieee80211_free_node(ic, ni); 533 ieee80211_node_critsec_end(ic, s); 534 } 535 } 536 537 void 538 ieee80211_free_allnodes(struct ieee80211com *ic) 539 { 540 struct ieee80211_node *ni; 541 ieee80211_node_critsec_decl(s); 542 543 ieee80211_node_critsec_begin(ic, s); 544 while ((ni = TAILQ_FIRST(&ic->ic_node)) != NULL) 545 _ieee80211_free_node(ic, ni); 546 ieee80211_node_critsec_end(ic, s); 547 } 548 549 void 550 ieee80211_timeout_nodes(struct ieee80211com *ic) 551 { 552 struct ieee80211_node *ni, *nextbs; 553 ieee80211_node_critsec_decl(s); 554 555 ieee80211_node_critsec_begin(ic, s); 556 for (ni = TAILQ_FIRST(&ic->ic_node); ni != NULL;) { 557 if (++ni->ni_inact > IEEE80211_INACT_MAX) { 558 IEEE80211_DPRINTF(("station %s timed out " 559 "due to inactivity (%u secs)\n", 560 ether_sprintf(ni->ni_macaddr), 561 ni->ni_inact)); 562 nextbs = TAILQ_NEXT(ni, ni_list); 563 /* 564 * Send a deauthenticate frame. 565 */ 566 IEEE80211_SEND_MGMT(ic, ni, 567 IEEE80211_FC0_SUBTYPE_DEAUTH, 568 IEEE80211_REASON_AUTH_EXPIRE); 569 ieee80211_free_node(ic, ni); 570 ni = nextbs; 571 } else 572 ni = TAILQ_NEXT(ni, ni_list); 573 } 574 if (!TAILQ_EMPTY(&ic->ic_node)) 575 ic->ic_inact_timer = IEEE80211_INACT_WAIT; 576 ieee80211_node_critsec_end(ic, s); 577 } 578 579 void 580 ieee80211_iterate_nodes(struct ieee80211com *ic, ieee80211_iter_func *f, void *arg) 581 { 582 struct ieee80211_node *ni; 583 ieee80211_node_critsec_decl(s); 584 585 ieee80211_node_critsec_begin(ic, s); 586 TAILQ_FOREACH(ni, &ic->ic_node, ni_list) 587 (*f)(arg, ni); 588 ieee80211_node_critsec_end(ic, s); 589 } 590
Indexes created Tue Sep 23 07:09:52 GMT 2025