ieee80211_node.c revision 1.7
1 /* $NetBSD: ieee80211_node.c,v 1.7 2003/10/29 21:50:57 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 1.7 2003/10/29 21:50:57 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 #ifdef __FreeBSD__ 53 #include <sys/bus.h> 54 #endif 55 #include <sys/proc.h> 56 #include <sys/sysctl.h> 57 58 #ifdef __FreeBSD__ 59 #include <machine/atomic.h> 60 #endif 61 62 #include <net/if.h> 63 #include <net/if_dl.h> 64 #include <net/if_media.h> 65 #include <net/if_arp.h> 66 #ifdef __FreeBSD__ 67 #include <net/ethernet.h> 68 #else 69 #include <net/if_ether.h> 70 #endif 71 #include <net/if_llc.h> 72 73 #include <net80211/ieee80211_var.h> 74 #include <net80211/ieee80211_compat.h> 75 76 #include <net/bpf.h> 77 78 #ifdef INET 79 #include <netinet/in.h> 80 #ifdef __FreeBSD__ 81 #include <netinet/if_ether.h> 82 #else 83 #include <net/if_ether.h> 84 #endif 85 #endif 86 87 static struct ieee80211_node *ieee80211_node_alloc(struct ieee80211com *); 88 static void ieee80211_node_free(struct ieee80211com *, struct ieee80211_node *); 89 static void ieee80211_node_copy(struct ieee80211com *, 90 struct ieee80211_node *, const struct ieee80211_node *); 91 static void ieee80211_setup_node(struct ieee80211com *ic, 92 struct ieee80211_node *ni, u_int8_t *macaddr); 93 static void _ieee80211_free_node(struct ieee80211com *, 94 struct ieee80211_node *); 95 96 void 97 ieee80211_node_attach(struct ifnet *ifp) 98 { 99 struct ieee80211com *ic = (void *)ifp; 100 101 #ifdef __FreeBSD__ 102 /* XXX need unit */ 103 mtx_init(&ic->ic_nodelock, ifp->if_name, "802.11 node table", MTX_DEF); 104 #endif 105 TAILQ_INIT(&ic->ic_node); 106 ic->ic_node_alloc = ieee80211_node_alloc; 107 ic->ic_node_free = ieee80211_node_free; 108 ic->ic_node_copy = ieee80211_node_copy; 109 } 110 111 void 112 ieee80211_node_lateattach(struct ifnet *ifp) 113 { 114 struct ieee80211com *ic = (void *)ifp; 115 116 ic->ic_bss = (*ic->ic_node_alloc)(ic); 117 KASSERT(ic->ic_bss != NULL, ("unable to setup inital BSS node")); 118 ic->ic_bss->ni_chan = IEEE80211_CHAN_ANYC; 119 } 120 121 void 122 ieee80211_node_detach(struct ifnet *ifp) 123 { 124 struct ieee80211com *ic = (void *)ifp; 125 126 if (ic->ic_bss != NULL) 127 (*ic->ic_node_free)(ic, ic->ic_bss); 128 ieee80211_free_allnodes(ic); 129 #ifdef __FreeBSD__ 130 mtx_destroy(&ic->ic_nodelock); 131 #endif 132 } 133 134 /* 135 * AP scanning support. 136 */ 137 138 /* 139 * Initialize the active channel set based on the set 140 * of available channels and the current PHY mode. 141 */ 142 static void 143 ieee80211_reset_scan(struct ifnet *ifp) 144 { 145 struct ieee80211com *ic = (void *)ifp; 146 147 memcpy(ic->ic_chan_scan, ic->ic_chan_active, 148 sizeof(ic->ic_chan_active)); 149 /* NB: hack, setup so next_scan starts with the first channel */ 150 if (ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC) 151 ic->ic_bss->ni_chan = &ic->ic_channels[IEEE80211_CHAN_MAX]; 152 } 153 154 /* 155 * Begin an active scan. 156 */ 157 void 158 ieee80211_begin_scan(struct ifnet *ifp) 159 { 160 struct ieee80211com *ic = (void *)ifp; 161 162 /* 163 * In all but hostap mode scanning starts off in 164 * an active mode before switching to passive. 165 */ 166 if (ic->ic_opmode != IEEE80211_M_HOSTAP) 167 ic->ic_flags |= IEEE80211_F_ASCAN; 168 if (ifp->if_flags & IFF_DEBUG) 169 if_printf(ifp, "begin %s scan\n", 170 (ic->ic_flags & IEEE80211_F_ASCAN) ? 171 "active" : "passive"); 172 /* 173 * Clear scan state and flush any previously seen 174 * AP's. Note that the latter assumes we don't act 175 * as both an AP and a station, otherwise we'll 176 * potentially flush state of stations associated 177 * with us. 178 */ 179 ieee80211_reset_scan(ifp); 180 ieee80211_free_allnodes(ic); 181 182 /* Scan the next channel. */ 183 ieee80211_next_scan(ifp); 184 } 185 186 /* 187 * Switch to the next channel marked for scanning. 188 */ 189 void 190 ieee80211_next_scan(struct ifnet *ifp) 191 { 192 struct ieee80211com *ic = (void *)ifp; 193 struct ieee80211_channel *chan; 194 195 chan = ic->ic_bss->ni_chan; 196 for (;;) { 197 if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) 198 chan = &ic->ic_channels[0]; 199 if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { 200 /* 201 * Honor channels marked passive-only 202 * during an active scan. 203 */ 204 if ((ic->ic_flags & IEEE80211_F_ASCAN) == 0 || 205 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) 206 break; 207 } 208 if (chan == ic->ic_bss->ni_chan) { 209 ieee80211_end_scan(ifp); 210 return; 211 } 212 } 213 clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); 214 IEEE80211_DPRINTF(("ieee80211_next_scan: chan %d->%d\n", 215 ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan), 216 ieee80211_chan2ieee(ic, chan))); 217 ic->ic_bss->ni_chan = chan; 218 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 219 } 220 221 void 222 ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) 223 { 224 struct ieee80211_node *ni; 225 struct ifnet *ifp = &ic->ic_if; 226 227 ni = ic->ic_bss; 228 if (ifp->if_flags & IFF_DEBUG) 229 if_printf(ifp, "creating ibss\n"); 230 ic->ic_flags |= IEEE80211_F_SIBSS; 231 ni->ni_chan = chan; 232 ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)]; 233 IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr); 234 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); 235 if (ic->ic_opmode == IEEE80211_M_IBSS) 236 ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ 237 ni->ni_esslen = ic->ic_des_esslen; 238 memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); 239 ni->ni_rssi = 0; 240 ni->ni_rstamp = 0; 241 memset(ni->ni_tstamp, 0, sizeof(ni->ni_tstamp)); 242 ni->ni_intval = ic->ic_lintval; 243 ni->ni_capinfo = IEEE80211_CAPINFO_IBSS; 244 if (ic->ic_flags & IEEE80211_F_WEPON) 245 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; 246 if (ic->ic_phytype == IEEE80211_T_FH) { 247 ni->ni_fhdwell = 200; /* XXX */ 248 ni->ni_fhindex = 1; 249 } 250 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 251 } 252 253 int 254 ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni) 255 { 256 struct ifnet *ifp = &ic->ic_if; 257 u_int8_t rate; 258 int fail; 259 260 fail = 0; 261 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) 262 fail |= 0x01; 263 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 264 ni->ni_chan != ic->ic_des_chan) 265 fail |= 0x01; 266 if (ic->ic_opmode == IEEE80211_M_IBSS) { 267 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 268 fail |= 0x02; 269 } else { 270 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) 271 fail |= 0x02; 272 } 273 if (ic->ic_flags & IEEE80211_F_WEPON) { 274 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 275 fail |= 0x04; 276 } else { 277 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) 278 fail |= 0x04; 279 } 280 rate = ieee80211_fix_rate(ic, ni, IEEE80211_F_DONEGO); 281 if (rate & IEEE80211_RATE_BASIC) 282 fail |= 0x08; 283 if (ic->ic_des_esslen != 0 && 284 (ni->ni_esslen != ic->ic_des_esslen || 285 memcmp(ni->ni_essid, ic->ic_des_essid, 286 ic->ic_des_esslen != 0))) 287 fail |= 0x10; 288 if ((ic->ic_flags & IEEE80211_F_DESBSSID) && 289 !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) 290 fail |= 0x20; 291 if (ifp->if_flags & IFF_DEBUG) { 292 printf(" %c %s", fail ? '-' : '+', 293 ether_sprintf(ni->ni_macaddr)); 294 printf(" %s%c", ether_sprintf(ni->ni_bssid), 295 fail & 0x20 ? '!' : ' '); 296 printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), 297 fail & 0x01 ? '!' : ' '); 298 printf(" %+4d", ni->ni_rssi); 299 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 300 fail & 0x08 ? '!' : ' '); 301 printf(" %4s%c", 302 (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 303 (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 304 "????", 305 fail & 0x02 ? '!' : ' '); 306 printf(" %3s%c ", 307 (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 308 "wep" : "no", 309 fail & 0x04 ? '!' : ' '); 310 ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); 311 printf("%s\n", fail & 0x10 ? "!" : ""); 312 } 313 return fail; 314 } 315 316 /* 317 * Complete a scan of potential channels. 318 */ 319 void 320 ieee80211_end_scan(struct ifnet *ifp) 321 { 322 struct ieee80211com *ic = (void *)ifp; 323 struct ieee80211_node *ni, *nextbs, *selbs; 324 int i, fail; 325 326 ic->ic_flags &= ~IEEE80211_F_ASCAN; 327 ni = TAILQ_FIRST(&ic->ic_node); 328 329 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 330 /* XXX off stack? */ 331 u_char occupied[roundup(IEEE80211_CHAN_MAX, NBBY)]; 332 /* 333 * The passive scan to look for existing AP's completed, 334 * select a channel to camp on. Identify the channels 335 * that already have one or more AP's and try to locate 336 * an unnoccupied one. If that fails, pick a random 337 * channel from the active set. 338 */ 339 for (; ni != NULL; ni = nextbs) { 340 ieee80211_ref_node(ni); 341 nextbs = TAILQ_NEXT(ni, ni_list); 342 setbit(occupied, ieee80211_chan2ieee(ic, ni->ni_chan)); 343 ieee80211_free_node(ic, ni); 344 } 345 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 346 if (isset(ic->ic_chan_active, i) && isclr(occupied, i)) 347 break; 348 if (i == IEEE80211_CHAN_MAX) { 349 fail = arc4random() & 3; /* random 0-3 */ 350 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 351 if (isset(ic->ic_chan_active, i) && fail-- == 0) 352 break; 353 } 354 ieee80211_create_ibss(ic, &ic->ic_channels[i]); 355 return; 356 } 357 if (ni == NULL) { 358 IEEE80211_DPRINTF(("%s: no scan candidate\n", __func__)); 359 notfound: 360 if (ic->ic_opmode == IEEE80211_M_IBSS && 361 (ic->ic_flags & IEEE80211_F_IBSSON) && 362 ic->ic_des_esslen != 0) { 363 ieee80211_create_ibss(ic, ic->ic_ibss_chan); 364 return; 365 } 366 /* 367 * Reset the list of channels to scan and start again. 368 */ 369 ieee80211_reset_scan(ifp); 370 ieee80211_next_scan(ifp); 371 return; 372 } 373 selbs = NULL; 374 if (ifp->if_flags & IFF_DEBUG) 375 if_printf(ifp, "\tmacaddr bssid chan rssi rate flag wep essid\n"); 376 for (; ni != NULL; ni = nextbs) { 377 ieee80211_ref_node(ni); 378 nextbs = TAILQ_NEXT(ni, ni_list); 379 if (ni->ni_fails) { 380 /* 381 * The configuration of the access points may change 382 * during my scan. So delete the entry for the AP 383 * and retry to associate if there is another beacon. 384 */ 385 if (ni->ni_fails++ > 2) 386 ieee80211_free_node(ic, ni); 387 continue; 388 } 389 if (ieee80211_match_bss(ic, ni) == 0) { 390 if (selbs == NULL) 391 selbs = ni; 392 else if (ni->ni_rssi > selbs->ni_rssi) { 393 ieee80211_unref_node(&selbs); 394 selbs = ni; 395 } else 396 ieee80211_unref_node(&ni); 397 } else { 398 ieee80211_unref_node(&ni); 399 } 400 } 401 if (selbs == NULL) 402 goto notfound; 403 (*ic->ic_node_copy)(ic, ic->ic_bss, selbs); 404 if (ic->ic_opmode == IEEE80211_M_IBSS) { 405 ieee80211_fix_rate(ic, ic->ic_bss, IEEE80211_F_DOFRATE | 406 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 407 if (ic->ic_bss->ni_rates.rs_nrates == 0) { 408 selbs->ni_fails++; 409 ieee80211_unref_node(&selbs); 410 goto notfound; 411 } 412 ieee80211_unref_node(&selbs); 413 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 414 } else { 415 ieee80211_unref_node(&selbs); 416 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 417 } 418 } 419 420 int 421 ieee80211_get_rate(struct ieee80211com *ic) 422 { 423 u_int8_t (*rates)[IEEE80211_RATE_MAXSIZE]; 424 int rate; 425 426 rates = &ic->ic_bss->ni_rates.rs_rates; 427 428 if (ic->ic_fixed_rate != -1) 429 rate = (*rates)[ic->ic_fixed_rate]; 430 else if (ic->ic_state == IEEE80211_S_RUN) 431 rate = (*rates)[ic->ic_bss->ni_txrate]; 432 else 433 rate = 0; 434 435 return rate & IEEE80211_RATE_VAL; 436 } 437 438 static struct ieee80211_node * 439 ieee80211_node_alloc(struct ieee80211com *ic) 440 { 441 return malloc(sizeof(struct ieee80211_node), M_DEVBUF, 442 M_NOWAIT | M_ZERO); 443 } 444 445 static void 446 ieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni) 447 { 448 if (ni->ni_challenge != NULL) { 449 free(ni->ni_challenge, M_DEVBUF); 450 ni->ni_challenge = NULL; 451 } 452 free(ni, M_DEVBUF); 453 } 454 455 static void 456 ieee80211_node_copy(struct ieee80211com *ic, 457 struct ieee80211_node *dst, const struct ieee80211_node *src) 458 { 459 *dst = *src; 460 dst->ni_challenge = NULL; 461 } 462 463 static void 464 ieee80211_setup_node(struct ieee80211com *ic, 465 struct ieee80211_node *ni, u_int8_t *macaddr) 466 { 467 int hash; 468 ieee80211_node_critsec_decl(s); 469 470 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 471 hash = IEEE80211_NODE_HASH(macaddr); 472 ni->ni_refcnt = 1; /* mark referenced */ 473 ieee80211_node_critsec_begin(ic, s); 474 TAILQ_INSERT_TAIL(&ic->ic_node, ni, ni_list); 475 LIST_INSERT_HEAD(&ic->ic_hash[hash], ni, ni_hash); 476 /* 477 * Note we don't enable the inactive timer when acting 478 * as a station. Nodes created in this mode represent 479 * AP's identified while scanning. If we time them out 480 * then several things happen: we can't return the data 481 * to users to show the list of AP's we encountered, and 482 * more importantly, we'll incorrectly deauthenticate 483 * ourself because the inactivity timer will kick us off. 484 */ 485 if (ic->ic_opmode != IEEE80211_M_STA) 486 ic->ic_inact_timer = IEEE80211_INACT_WAIT; 487 ieee80211_node_critsec_end(ic, s); 488 } 489 490 struct ieee80211_node * 491 ieee80211_alloc_node(struct ieee80211com *ic, u_int8_t *macaddr) 492 { 493 struct ieee80211_node *ni = (*ic->ic_node_alloc)(ic); 494 if (ni != NULL) 495 ieee80211_setup_node(ic, ni, macaddr); 496 return ni; 497 } 498 499 struct ieee80211_node * 500 ieee80211_dup_bss(struct ieee80211com *ic, u_int8_t *macaddr) 501 { 502 struct ieee80211_node *ni = (*ic->ic_node_alloc)(ic); 503 if (ni != NULL) { 504 memcpy(ni, ic->ic_bss, sizeof(struct ieee80211_node)); 505 ieee80211_setup_node(ic, ni, macaddr); 506 } 507 return ni; 508 } 509 510 struct ieee80211_node * 511 ieee80211_find_node(struct ieee80211com *ic, u_int8_t *macaddr) 512 { 513 struct ieee80211_node *ni; 514 int hash; 515 ieee80211_node_critsec_decl(s); 516 517 hash = IEEE80211_NODE_HASH(macaddr); 518 ieee80211_node_critsec_begin(ic, s); 519 LIST_FOREACH(ni, &ic->ic_hash[hash], ni_hash) { 520 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) { 521 ieee80211_node_incref(ni); /* mark referenced */ 522 break; 523 } 524 } 525 ieee80211_node_critsec_end(ic, s); 526 return ni; 527 } 528 529 struct ieee80211_node * 530 ieee80211_find_txnode(struct ieee80211com *ic, u_int8_t *macaddr) 531 { 532 struct ieee80211_node *ni; 533 ieee80211_node_critsec_decl(s); 534 535 /* 536 * The destination address should be in the node table 537 * unless this is a multicast/broadcast frames or we are 538 * in station mode. 539 */ 540 if (IEEE80211_IS_MULTICAST(macaddr) || 541 ic->ic_opmode == IEEE80211_M_STA) 542 ni = ic->ic_bss; 543 else { 544 ieee80211_node_critsec_begin(ic, s); 545 ni = ieee80211_find_node(ic, macaddr); 546 if (ni == NULL) { 547 if (ic->ic_opmode != IEEE80211_M_MONITOR) 548 ni = ieee80211_dup_bss(ic, macaddr); 549 IEEE80211_DPRINTF(("%s: faked-up node %p for %s\n", 550 __func__, ni, ether_sprintf(macaddr))); 551 if (ni == NULL) { 552 ieee80211_node_critsec_end(ic, s); 553 /* ic->ic_stats.st_tx_nonode++; XXX statistic */ 554 return NULL; 555 } 556 (void)ieee80211_ref_node(ni); 557 } 558 ieee80211_node_critsec_end(ic, s); 559 } 560 return ni; 561 } 562 563 /* 564 * For some types of packet and for some operating modes, it is 565 * desirable to process a Rx packet using its sender's node-record 566 * instead of the BSS record, when that is possible. 567 * 568 * - AP mode: it is desirable to keep a node-record for every 569 * authenticated/associated station *in the BSS*. For future use, 570 * we also track neighboring APs, since they might belong to the 571 * same ESSID. 572 * 573 * - IBSS mode: it is desirable to keep a node-record for every 574 * station *in the BSS*. 575 * 576 * - monitor mode: it is desirable to keep a node-record for every 577 * sender, regardless of BSS. 578 * 579 * - STA mode: the only available node-record is the BSS record, 580 * ic->ic_bss. 581 * 582 * Of all the 802.11 Control packets, only the node-records for 583 * RTS packets node-record can be looked up. 584 * 585 * Return non-zero if the packet's node-record is kept, zero 586 * otherwise. 587 */ 588 static __inline int 589 ieee80211_needs_rxnode(struct ieee80211com *ic, struct ieee80211_frame *wh, 590 u_int8_t **bssid) 591 { 592 struct ieee80211_node *bss = ic->ic_bss; 593 int needsnode, rc = 0; 594 595 if (ic->ic_opmode == IEEE80211_M_STA) 596 return 0; 597 598 needsnode = (ic->ic_opmode == IEEE80211_M_MONITOR); 599 600 *bssid = NULL; 601 602 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) { 603 case IEEE80211_FC0_TYPE_CTL: 604 return (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == 605 IEEE80211_FC0_SUBTYPE_RTS; 606 607 case IEEE80211_FC0_TYPE_MGT: 608 *bssid = wh->i_addr3; 609 rc = IEEE80211_ADDR_EQ(*bssid, bss->ni_bssid); 610 break; 611 case IEEE80211_FC0_TYPE_DATA: 612 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 613 case IEEE80211_FC1_DIR_NODS: 614 *bssid = wh->i_addr3; 615 if (ic->ic_opmode == IEEE80211_M_IBSS || 616 ic->ic_opmode == IEEE80211_M_AHDEMO) 617 rc = IEEE80211_ADDR_EQ(*bssid, bss->ni_bssid); 618 break; 619 case IEEE80211_FC1_DIR_TODS: 620 *bssid = wh->i_addr1; 621 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 622 rc = IEEE80211_ADDR_EQ(*bssid, bss->ni_bssid); 623 break; 624 case IEEE80211_FC1_DIR_FROMDS: 625 case IEEE80211_FC1_DIR_DSTODS: 626 *bssid = wh->i_addr2; 627 rc = (ic->ic_opmode == IEEE80211_M_HOSTAP); 628 break; 629 } 630 break; 631 } 632 return needsnode || rc; 633 } 634 635 struct ieee80211_node * 636 ieee80211_find_rxnode(struct ieee80211com *ic, struct ieee80211_frame *wh) 637 { 638 struct ieee80211_node *ni; 639 const static u_int8_t zero[IEEE80211_ADDR_LEN]; 640 u_int8_t *bssid; 641 ieee80211_node_critsec_decl(s); 642 643 ieee80211_node_critsec_begin(ic, s); 644 645 if (!ieee80211_needs_rxnode(ic, wh, &bssid)) 646 return ieee80211_ref_node(ic->ic_bss); 647 648 ni = ieee80211_find_node(ic, wh->i_addr2); 649 650 if (ni == NULL) { 651 if (ic->ic_opmode != IEEE80211_M_HOSTAP) { 652 if ((ni = ieee80211_dup_bss(ic, wh->i_addr2)) != NULL) 653 IEEE80211_ADDR_COPY(ni->ni_bssid, 654 (bssid != NULL) ? bssid : zero); 655 656 IEEE80211_DPRINTF(("%s: faked-up node %p for %s\n", 657 __func__, ni, ether_sprintf(wh->i_addr2))); 658 } 659 ni = ieee80211_ref_node((ni == NULL) ? ic->ic_bss : ni); 660 } 661 ieee80211_node_critsec_end(ic, s); 662 KASSERT(ni != NULL, ("%s: null node", __func__)); 663 return ni; 664 } 665 666 /* 667 * Like find but search based on the channel too. 668 */ 669 struct ieee80211_node * 670 ieee80211_lookup_node(struct ieee80211com *ic, 671 u_int8_t *macaddr, struct ieee80211_channel *chan) 672 { 673 struct ieee80211_node *ni; 674 int hash; 675 ieee80211_node_critsec_decl(s); 676 677 hash = IEEE80211_NODE_HASH(macaddr); 678 ieee80211_node_critsec_begin(ic, s); 679 LIST_FOREACH(ni, &ic->ic_hash[hash], ni_hash) { 680 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && ni->ni_chan == chan) { 681 ieee80211_node_incref(ni);/* mark referenced */ 682 break; 683 } 684 } 685 ieee80211_node_critsec_end(ic, s); 686 return ni; 687 } 688 689 static void 690 _ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 691 { 692 KASSERT(ni != ic->ic_bss, ("freeing bss node")); 693 694 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 695 TAILQ_REMOVE(&ic->ic_node, ni, ni_list); 696 LIST_REMOVE(ni, ni_hash); 697 if (!IF_IS_EMPTY(&ni->ni_savedq)) { 698 IF_PURGE(&ni->ni_savedq); 699 if (ic->ic_set_tim) 700 ic->ic_set_tim(ic, ni->ni_associd, 0); 701 } 702 if (TAILQ_EMPTY(&ic->ic_node)) 703 ic->ic_inact_timer = 0; 704 (*ic->ic_node_free)(ic, ni); 705 } 706 707 void 708 ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) 709 { 710 ieee80211_node_critsec_decl(s); 711 712 KASSERT(ni != ic->ic_bss, ("freeing ic_bss")); 713 714 if (ieee80211_node_decref(ni) == 0) { 715 ieee80211_node_critsec_begin(ic, s); 716 _ieee80211_free_node(ic, ni); 717 ieee80211_node_critsec_end(ic, s); 718 } 719 } 720 721 void 722 ieee80211_free_allnodes(struct ieee80211com *ic) 723 { 724 struct ieee80211_node *ni; 725 ieee80211_node_critsec_decl(s); 726 727 ieee80211_node_critsec_begin(ic, s); 728 while ((ni = TAILQ_FIRST(&ic->ic_node)) != NULL) 729 _ieee80211_free_node(ic, ni); 730 ieee80211_node_critsec_end(ic, s); 731 } 732 733 void 734 ieee80211_timeout_nodes(struct ieee80211com *ic) 735 { 736 struct ieee80211_node *ni, *nextbs; 737 ieee80211_node_critsec_decl(s); 738 739 ieee80211_node_critsec_begin(ic, s); 740 for (ni = TAILQ_FIRST(&ic->ic_node); ni != NULL;) { 741 if (++ni->ni_inact > IEEE80211_INACT_MAX) { 742 IEEE80211_DPRINTF(("station %s timed out " 743 "due to inactivity (%u secs)\n", 744 ether_sprintf(ni->ni_macaddr), 745 ni->ni_inact)); 746 nextbs = TAILQ_NEXT(ni, ni_list); 747 /* 748 * Send a deauthenticate frame. 749 */ 750 IEEE80211_SEND_MGMT(ic, ni, 751 IEEE80211_FC0_SUBTYPE_DEAUTH, 752 IEEE80211_REASON_AUTH_EXPIRE); 753 ieee80211_free_node(ic, ni); 754 ni = nextbs; 755 } else 756 ni = TAILQ_NEXT(ni, ni_list); 757 } 758 if (!TAILQ_EMPTY(&ic->ic_node)) 759 ic->ic_inact_timer = IEEE80211_INACT_WAIT; 760 ieee80211_node_critsec_end(ic, s); 761 } 762 763 void 764 ieee80211_iterate_nodes(struct ieee80211com *ic, ieee80211_iter_func *f, void *arg) 765 { 766 struct ieee80211_node *ni; 767 ieee80211_node_critsec_decl(s); 768 769 ieee80211_node_critsec_begin(ic, s); 770 TAILQ_FOREACH(ni, &ic->ic_node, ni_list) 771 (*f)(arg, ni); 772 ieee80211_node_critsec_end(ic, s); 773 } 774
Indexes created Tue Sep 23 07:09:52 GMT 2025