ieee80211_node.c revision 140440
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2005 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 140440 2005-01-18 19:52:36Z sam $"); 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/mbuf.h> 39#include <sys/malloc.h> 40#include <sys/kernel.h> 41 42#include <sys/socket.h> 43 44#include <net/if.h> 45#include <net/if_media.h> 46#include <net/ethernet.h> 47 48#include <net80211/ieee80211_var.h> 49 50#include <net/bpf.h> 51 52static struct ieee80211_node *node_alloc(struct ieee80211_node_table *); 53static void node_cleanup(struct ieee80211_node *); 54static void node_free(struct ieee80211_node *); 55static u_int8_t node_getrssi(const struct ieee80211_node *); 56 57static void ieee80211_setup_node(struct ieee80211_node_table *, 58 struct ieee80211_node *, const u_int8_t *); 59static void _ieee80211_free_node(struct ieee80211_node *); 60static void ieee80211_free_allnodes(struct ieee80211_node_table *); 61 62static void ieee80211_timeout_scan_candidates(struct ieee80211_node_table *); 63static void ieee80211_timeout_stations(struct ieee80211_node_table *); 64 65static void ieee80211_set_tim(struct ieee80211com *, 66 struct ieee80211_node *, int set); 67 68static void ieee80211_node_table_init(struct ieee80211com *ic, 69 struct ieee80211_node_table *nt, const char *name, int inact, 70 void (*timeout)(struct ieee80211_node_table *)); 71static struct ieee80211_node_table *ieee80211_node_table_alloc( 72 struct ieee80211com *ic, const char *name, int inact, 73 void (*timeout)(struct ieee80211_node_table *)); 74static void ieee80211_node_table_cleanup(struct ieee80211_node_table *nt); 75 76MALLOC_DEFINE(M_80211_NODE, "80211node", "802.11 node state"); 77 78void 79ieee80211_node_attach(struct ieee80211com *ic) 80{ 81 82 ic->ic_sta = NULL; /* defer to when we need it */ 83 ieee80211_node_table_init(ic, &ic->ic_scan, "scan", 84 IEEE80211_INACT_SCAN, ieee80211_timeout_scan_candidates); 85 86 ic->ic_node_alloc = node_alloc; 87 ic->ic_node_free = node_free; 88 ic->ic_node_cleanup = node_cleanup; 89 ic->ic_node_getrssi = node_getrssi; 90 91 /* default station inactivity timer setings */ 92 ic->ic_inact_init = IEEE80211_INACT_INIT; 93 ic->ic_inact_auth = IEEE80211_INACT_AUTH; 94 ic->ic_inact_run = IEEE80211_INACT_RUN; 95 ic->ic_inact_probe = IEEE80211_INACT_PROBE; 96 97 /* XXX defer */ 98 if (ic->ic_max_aid == 0) 99 ic->ic_max_aid = IEEE80211_AID_DEF; 100 else if (ic->ic_max_aid > IEEE80211_AID_MAX) 101 ic->ic_max_aid = IEEE80211_AID_MAX; 102 MALLOC(ic->ic_aid_bitmap, u_int32_t *, 103 howmany(ic->ic_max_aid, 32) * sizeof(u_int32_t), 104 M_DEVBUF, M_NOWAIT | M_ZERO); 105 if (ic->ic_aid_bitmap == NULL) { 106 /* XXX no way to recover */ 107 printf("%s: no memory for AID bitmap!\n", __func__); 108 ic->ic_max_aid = 0; 109 } 110 111 /* XXX defer until using hostap/ibss mode */ 112 ic->ic_tim_len = howmany(ic->ic_max_aid, 8) * sizeof(u_int8_t); 113 MALLOC(ic->ic_tim_bitmap, u_int8_t *, ic->ic_tim_len, 114 M_DEVBUF, M_NOWAIT | M_ZERO); 115 if (ic->ic_tim_bitmap == NULL) { 116 /* XXX no way to recover */ 117 printf("%s: no memory for TIM bitmap!\n", __func__); 118 } 119 ic->ic_set_tim = ieee80211_set_tim; /* NB: driver should override */ 120} 121 122void 123ieee80211_node_lateattach(struct ieee80211com *ic) 124{ 125 struct ieee80211_node *ni; 126 struct ieee80211_rsnparms *rsn; 127 128 ni = ieee80211_alloc_node(&ic->ic_scan, ic->ic_myaddr); 129 KASSERT(ni != NULL, ("unable to setup inital BSS node")); 130 /* 131 * Setup "global settings" in the bss node so that 132 * each new station automatically inherits them. 133 */ 134 rsn = &ni->ni_rsn; 135 /* WEP, TKIP, and AES-CCM are always supported */ 136 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_WEP; 137 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_TKIP; 138 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_AES_CCM; 139 if (ic->ic_caps & IEEE80211_C_AES) 140 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_AES_OCB; 141 if (ic->ic_caps & IEEE80211_C_CKIP) 142 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_CKIP; 143 /* 144 * Default unicast cipher to WEP for 802.1x use. If 145 * WPA is enabled the management code will set these 146 * values to reflect. 147 */ 148 rsn->rsn_ucastcipher = IEEE80211_CIPHER_WEP; 149 rsn->rsn_ucastkeylen = 104 / NBBY; 150 /* 151 * WPA says the multicast cipher is the lowest unicast 152 * cipher supported. But we skip WEP which would 153 * otherwise be used based on this criteria. 154 */ 155 rsn->rsn_mcastcipher = IEEE80211_CIPHER_TKIP; 156 rsn->rsn_mcastkeylen = 128 / NBBY; 157 158 /* 159 * We support both WPA-PSK and 802.1x; the one used 160 * is determined by the authentication mode and the 161 * setting of the PSK state. 162 */ 163 rsn->rsn_keymgmtset = WPA_ASE_8021X_UNSPEC | WPA_ASE_8021X_PSK; 164 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 165 166 ic->ic_bss = ieee80211_ref_node(ni); /* hold reference */ 167 ic->ic_auth = ieee80211_authenticator_get(ni->ni_authmode); 168} 169 170void 171ieee80211_node_detach(struct ieee80211com *ic) 172{ 173 174 if (ic->ic_bss != NULL) { 175 ieee80211_free_node(ic->ic_bss); 176 ic->ic_bss = NULL; 177 } 178 ieee80211_node_table_cleanup(&ic->ic_scan); 179 if (ic->ic_sta != NULL) { 180 ieee80211_node_table_free(ic->ic_sta); 181 ic->ic_sta = NULL; 182 } 183 if (ic->ic_aid_bitmap != NULL) { 184 FREE(ic->ic_aid_bitmap, M_DEVBUF); 185 ic->ic_aid_bitmap = NULL; 186 } 187 if (ic->ic_tim_bitmap != NULL) { 188 FREE(ic->ic_tim_bitmap, M_DEVBUF); 189 ic->ic_tim_bitmap = NULL; 190 } 191} 192 193/* 194 * Port authorize/unauthorize interfaces for use by an authenticator. 195 */ 196 197void 198ieee80211_node_authorize(struct ieee80211com *ic, struct ieee80211_node *ni) 199{ 200 ni->ni_flags |= IEEE80211_NODE_AUTH; 201 ni->ni_inact_reload = ic->ic_inact_run; 202} 203 204void 205ieee80211_node_unauthorize(struct ieee80211com *ic, struct ieee80211_node *ni) 206{ 207 ni->ni_flags &= ~IEEE80211_NODE_AUTH; 208} 209 210/* 211 * Set/change the channel. The rate set is also updated as 212 * to insure a consistent view by drivers. 213 */ 214static __inline void 215ieee80211_set_chan(struct ieee80211com *ic, 216 struct ieee80211_node *ni, struct ieee80211_channel *chan) 217{ 218 ni->ni_chan = chan; 219 ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, chan)]; 220} 221 222/* 223 * AP scanning support. 224 */ 225 226#ifdef IEEE80211_DEBUG 227static void 228dump_chanlist(const u_char chans[]) 229{ 230 const char *sep; 231 int i; 232 233 sep = " "; 234 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 235 if (isset(chans, i)) { 236 printf("%s%u", sep, i); 237 sep = ", "; 238 } 239} 240#endif /* IEEE80211_DEBUG */ 241 242/* 243 * Initialize the channel set to scan based on the 244 * of available channels and the current PHY mode. 245 */ 246static void 247ieee80211_reset_scan(struct ieee80211com *ic) 248{ 249 250 /* XXX ic_des_chan should be handled with ic_chan_active */ 251 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC) { 252 memset(ic->ic_chan_scan, 0, sizeof(ic->ic_chan_scan)); 253 setbit(ic->ic_chan_scan, 254 ieee80211_chan2ieee(ic, ic->ic_des_chan)); 255 } else 256 memcpy(ic->ic_chan_scan, ic->ic_chan_active, 257 sizeof(ic->ic_chan_active)); 258 /* NB: hack, setup so next_scan starts with the first channel */ 259 if (ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC) 260 ieee80211_set_chan(ic, ic->ic_bss, 261 &ic->ic_channels[IEEE80211_CHAN_MAX]); 262#ifdef IEEE80211_DEBUG 263 if (ieee80211_msg_scan(ic)) { 264 printf("%s: scan set:", __func__); 265 dump_chanlist(ic->ic_chan_scan); 266 printf(" start chan %u\n", 267 ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan)); 268 } 269#endif /* IEEE80211_DEBUG */ 270} 271 272/* 273 * Begin an active scan. 274 */ 275void 276ieee80211_begin_scan(struct ieee80211com *ic, int reset) 277{ 278 279 ic->ic_scan.nt_scangen++; 280 /* 281 * In all but hostap mode scanning starts off in 282 * an active mode before switching to passive. 283 */ 284 if (ic->ic_opmode != IEEE80211_M_HOSTAP) { 285 ic->ic_flags |= IEEE80211_F_ASCAN; 286 ic->ic_stats.is_scan_active++; 287 } else 288 ic->ic_stats.is_scan_passive++; 289 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 290 "begin %s scan in %s mode, scangen %u\n", 291 (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive", 292 ieee80211_phymode_name[ic->ic_curmode], ic->ic_scan.nt_scangen); 293 /* 294 * Clear scan state and flush any previously seen AP's. 295 */ 296 ieee80211_reset_scan(ic); 297 if (reset) 298 ieee80211_free_allnodes(&ic->ic_scan); 299 300 ic->ic_flags |= IEEE80211_F_SCAN; 301 302 /* Scan the next channel. */ 303 ieee80211_next_scan(ic); 304} 305 306/* 307 * Switch to the next channel marked for scanning. 308 */ 309int 310ieee80211_next_scan(struct ieee80211com *ic) 311{ 312 struct ieee80211_channel *chan; 313 314 /* 315 * Insure any previous mgt frame timeouts don't fire. 316 * This assumes the driver does the right thing in 317 * flushing anything queued in the driver and below. 318 */ 319 ic->ic_mgt_timer = 0; 320 321 chan = ic->ic_bss->ni_chan; 322 do { 323 if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) 324 chan = &ic->ic_channels[0]; 325 if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { 326 clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); 327 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 328 "%s: chan %d->%d\n", __func__, 329 ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan), 330 ieee80211_chan2ieee(ic, chan)); 331 ieee80211_set_chan(ic, ic->ic_bss, chan); 332#ifdef notyet 333 /* XXX driver state change */ 334 /* 335 * Scan next channel. If doing an active scan 336 * and the channel is not marked passive-only 337 * then send a probe request. Otherwise just 338 * listen for beacons on the channel. 339 */ 340 if ((ic->ic_flags & IEEE80211_F_ASCAN) && 341 (ni->ni_chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) { 342 IEEE80211_SEND_MGMT(ic, ni, 343 IEEE80211_FC0_SUBTYPE_PROBE_REQ, 0); 344 } 345#else 346 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 347#endif 348 return 1; 349 } 350 } while (chan != ic->ic_bss->ni_chan); 351 ieee80211_end_scan(ic); 352 return 0; 353} 354 355void 356ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) 357{ 358 struct ieee80211_node *ni; 359 360 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 361 "%s: creating ibss\n", __func__); 362 363 /* 364 * Create the station/neighbor table. Note that for adhoc 365 * mode we make the initial inactivity timer longer since 366 * we create nodes only through discovery and they typically 367 * are long-lived associations. 368 */ 369 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 370 ic->ic_sta = ieee80211_node_table_alloc(ic, 371 "station", ic->ic_inact_init, 372 ieee80211_timeout_stations); 373 else 374 ic->ic_sta = ieee80211_node_table_alloc(ic, 375 "neighbor", ic->ic_inact_run, 376 ieee80211_timeout_stations); 377 if (ic->ic_sta == NULL) { 378 /* 379 * Should remain in SCAN state and retry. 380 */ 381 /* XXX stat+msg */ 382 return; 383 } 384 385 ni = ic->ic_bss; 386 IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr); 387 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); 388 ni->ni_esslen = ic->ic_des_esslen; 389 memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); 390 ni->ni_rssi = 0; 391 ni->ni_rstamp = 0; 392 ni->ni_tstamp.tsf = 0; 393 ni->ni_intval = ic->ic_lintval; 394 ni->ni_capinfo = 0; 395 ni->ni_erp = 0; 396 if (ic->ic_flags & IEEE80211_F_PRIVACY) 397 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; 398 if (ic->ic_phytype == IEEE80211_T_FH) { 399 ni->ni_fhdwell = 200; /* XXX */ 400 ni->ni_fhindex = 1; 401 } 402 if (ic->ic_opmode == IEEE80211_M_IBSS) { 403 ic->ic_flags |= IEEE80211_F_SIBSS; 404 ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS; /* XXX */ 405 ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ 406 } 407 /* 408 * Fix the channel and related attributes. 409 */ 410 ieee80211_set_chan(ic, ni, chan); 411 ic->ic_curmode = ieee80211_chan2mode(ic, chan); 412 /* 413 * Do mode-specific rate setup. 414 */ 415 if (ic->ic_curmode == IEEE80211_MODE_11G) { 416 /* 417 * Use a mixed 11b/11g rate set. 418 */ 419 ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11G); 420 } else if (ic->ic_curmode == IEEE80211_MODE_11B) { 421 /* 422 * Force pure 11b rate set. 423 */ 424 ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11B); 425 } 426 /* 427 * Set the erp state (mostly the slot time) to deal with 428 * the auto-select case; this should be redundant if the 429 * mode is locked. 430 */ 431 ieee80211_reset_erp(ic); 432 ieee80211_wme_initparams(ic); 433 434 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 435} 436 437void 438ieee80211_reset_bss(struct ieee80211com *ic) 439{ 440 struct ieee80211_node *ni, *obss; 441 442 ieee80211_node_table_reset(&ic->ic_scan); 443 ni = ieee80211_alloc_node(&ic->ic_scan, ic->ic_myaddr); 444 KASSERT(ni != NULL, ("unable to setup inital BSS node")); 445 obss = ic->ic_bss; 446 ic->ic_bss = ieee80211_ref_node(ni); 447 if (obss != NULL) 448 ieee80211_free_node(obss); 449 if (ic->ic_sta != NULL) { 450 ieee80211_node_table_free(ic->ic_sta); 451 ic->ic_sta = NULL; 452 } 453} 454 455static int 456ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni) 457{ 458 u_int8_t rate; 459 int fail; 460 461 fail = 0; 462 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) 463 fail |= 0x01; 464 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 465 ni->ni_chan != ic->ic_des_chan) 466 fail |= 0x01; 467 if (ic->ic_opmode == IEEE80211_M_IBSS) { 468 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 469 fail |= 0x02; 470 } else { 471 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) 472 fail |= 0x02; 473 } 474 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 475 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 476 fail |= 0x04; 477 } else { 478 /* XXX does this mean privacy is supported or required? */ 479 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) 480 fail |= 0x04; 481 } 482 rate = ieee80211_fix_rate(ic, ni, 483 IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE); 484 if (rate & IEEE80211_RATE_BASIC) 485 fail |= 0x08; 486 if (ic->ic_des_esslen != 0 && 487 (ni->ni_esslen != ic->ic_des_esslen || 488 memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0)) 489 fail |= 0x10; 490 if ((ic->ic_flags & IEEE80211_F_DESBSSID) && 491 !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) 492 fail |= 0x20; 493#ifdef IEEE80211_DEBUG 494 if (ieee80211_msg_scan(ic)) { 495 printf(" %c %s", fail ? '-' : '+', 496 ether_sprintf(ni->ni_macaddr)); 497 printf(" %s%c", ether_sprintf(ni->ni_bssid), 498 fail & 0x20 ? '!' : ' '); 499 printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), 500 fail & 0x01 ? '!' : ' '); 501 printf(" %+4d", ni->ni_rssi); 502 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 503 fail & 0x08 ? '!' : ' '); 504 printf(" %4s%c", 505 (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 506 (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 507 "????", 508 fail & 0x02 ? '!' : ' '); 509 printf(" %3s%c ", 510 (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 511 "wep" : "no", 512 fail & 0x04 ? '!' : ' '); 513 ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); 514 printf("%s\n", fail & 0x10 ? "!" : ""); 515 } 516#endif 517 return fail; 518} 519 520static __inline u_int8_t 521maxrate(const struct ieee80211_node *ni) 522{ 523 const struct ieee80211_rateset *rs = &ni->ni_rates; 524 /* NB: assumes rate set is sorted (happens on frame receive) */ 525 return rs->rs_rates[rs->rs_nrates-1] & IEEE80211_RATE_VAL; 526} 527 528/* 529 * Compare the capabilities of two nodes and decide which is 530 * more desirable (return >0 if a is considered better). Note 531 * that we assume compatibility/usability has already been checked 532 * so we don't need to (e.g. validate whether privacy is supported). 533 * Used to select the best scan candidate for association in a BSS. 534 */ 535static int 536ieee80211_node_compare(struct ieee80211com *ic, 537 const struct ieee80211_node *a, 538 const struct ieee80211_node *b) 539{ 540 u_int8_t maxa, maxb; 541 u_int8_t rssia, rssib; 542 543 /* privacy support preferred */ 544 if ((a->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) && 545 (b->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 546 return 1; 547 if ((a->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0 && 548 (b->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)) 549 return -1; 550 551 rssia = ic->ic_node_getrssi(a); 552 rssib = ic->ic_node_getrssi(b); 553 if (abs(rssib - rssia) < 5) { 554 /* best/max rate preferred if signal level close enough XXX */ 555 maxa = maxrate(a); 556 maxb = maxrate(b); 557 if (maxa != maxb) 558 return maxa - maxb; 559 /* XXX use freq for channel preference */ 560 /* for now just prefer 5Ghz band to all other bands */ 561 if (IEEE80211_IS_CHAN_5GHZ(a->ni_chan) && 562 !IEEE80211_IS_CHAN_5GHZ(b->ni_chan)) 563 return 1; 564 if (!IEEE80211_IS_CHAN_5GHZ(a->ni_chan) && 565 IEEE80211_IS_CHAN_5GHZ(b->ni_chan)) 566 return -1; 567 } 568 /* all things being equal, use signal level */ 569 return rssia - rssib; 570} 571 572/* 573 * Complete a scan of potential channels. 574 */ 575void 576ieee80211_end_scan(struct ieee80211com *ic) 577{ 578 struct ieee80211_node *ni, *nextbs, *selbs; 579 struct ieee80211_node_table *nt; 580 581 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "end %s scan\n", 582 (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive"); 583 584 ic->ic_flags &= ~(IEEE80211_F_SCAN | IEEE80211_F_ASCAN); 585 nt = &ic->ic_scan; 586 ni = TAILQ_FIRST(&nt->nt_node); 587 588 ieee80211_notify_scan_done(ic); 589 590 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 591 u_int8_t maxrssi[IEEE80211_CHAN_MAX]; /* XXX off stack? */ 592 int i, bestchan; 593 u_int8_t rssi; 594 595 /* 596 * The passive scan to look for existing AP's completed, 597 * select a channel to camp on. Identify the channels 598 * that already have one or more AP's and try to locate 599 * an unnoccupied one. If that fails, pick a channel that 600 * looks to be quietest. 601 */ 602 memset(maxrssi, 0, sizeof(maxrssi)); 603 for (; ni != NULL; ni = nextbs) { 604 ieee80211_ref_node(ni); 605 nextbs = TAILQ_NEXT(ni, ni_list); 606 rssi = ic->ic_node_getrssi(ni); 607 i = ieee80211_chan2ieee(ic, ni->ni_chan); 608 if (rssi > maxrssi[i]) 609 maxrssi[i] = rssi; 610 ieee80211_unref_node(&ni); 611 } 612 /* XXX select channel more intelligently */ 613 bestchan = -1; 614 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 615 if (isset(ic->ic_chan_active, i)) { 616 /* 617 * If the channel is unoccupied the max rssi 618 * should be zero; just take it. Otherwise 619 * track the channel with the lowest rssi and 620 * use that when all channels appear occupied. 621 */ 622 if (maxrssi[i] == 0) { 623 bestchan = i; 624 break; 625 } 626 if (maxrssi[i] < maxrssi[bestchan]) 627 bestchan = i; 628 } 629 if (bestchan != -1) { 630 ieee80211_create_ibss(ic, &ic->ic_channels[bestchan]); 631 return; 632 } 633 /* no suitable channel, should not happen */ 634 } 635 636 /* 637 * When manually sequencing the state machine; scan just once 638 * regardless of whether we have a candidate or not. The 639 * controlling application is expected to setup state and 640 * initiate an association. 641 */ 642 if (ic->ic_roaming == IEEE80211_ROAMING_MANUAL) 643 return; 644 /* 645 * Automatic sequencing; look for a candidate and 646 * if found join the network. 647 */ 648 if (ni == NULL) { 649 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 650 "%s: no scan candidate\n", __func__); 651 notfound: 652 if (ic->ic_opmode == IEEE80211_M_IBSS && 653 (ic->ic_flags & IEEE80211_F_IBSSON) && 654 ic->ic_des_esslen != 0) { 655 ieee80211_create_ibss(ic, ic->ic_ibss_chan); 656 return; 657 } 658 /* 659 * Reset the list of channels to scan and start again. 660 */ 661 ieee80211_reset_scan(ic); 662 ic->ic_flags |= IEEE80211_F_SCAN; 663 ieee80211_next_scan(ic); 664 return; 665 } 666 selbs = NULL; 667 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "\t%s\n", 668 "macaddr bssid chan rssi rate flag wep essid"); 669 for (; ni != NULL; ni = nextbs) { 670 ieee80211_ref_node(ni); 671 nextbs = TAILQ_NEXT(ni, ni_list); 672 if (ni->ni_fails) { 673 /* 674 * The configuration of the access points may change 675 * during my scan. So delete the entry for the AP 676 * and retry to associate if there is another beacon. 677 */ 678 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 679 "%s: skip scan candidate %s, fails %u\n", 680 __func__, ether_sprintf(ni->ni_macaddr), 681 ni->ni_fails); 682 if (ni->ni_fails++ > 2) 683 ieee80211_free_node(ni); 684 continue; 685 } 686 if (ieee80211_match_bss(ic, ni) == 0) { 687 if (selbs == NULL) 688 selbs = ni; 689 else if (ieee80211_node_compare(ic, ni, selbs) > 0) { 690 ieee80211_unref_node(&selbs); 691 selbs = ni; 692 } else 693 ieee80211_unref_node(&ni); 694 } else { 695 ieee80211_unref_node(&ni); 696 } 697 } 698 if (selbs == NULL) 699 goto notfound; 700 if (!ieee80211_sta_join(ic, selbs)) { 701 ieee80211_unref_node(&selbs); 702 goto notfound; 703 } 704} 705 706/* 707 * Handle 802.11 ad hoc network merge. The 708 * convention, set by the Wireless Ethernet Compatibility Alliance 709 * (WECA), is that an 802.11 station will change its BSSID to match 710 * the "oldest" 802.11 ad hoc network, on the same channel, that 711 * has the station's desired SSID. The "oldest" 802.11 network 712 * sends beacons with the greatest TSF timestamp. 713 * 714 * The caller is assumed to validate TSF's before attempting a merge. 715 * 716 * Return !0 if the BSSID changed, 0 otherwise. 717 */ 718int 719ieee80211_ibss_merge(struct ieee80211com *ic, struct ieee80211_node *ni) 720{ 721 722 if (IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) { 723 /* unchanged, nothing to do */ 724 return 0; 725 } 726 if (ieee80211_match_bss(ic, ni) != 0) { /* capabilities mismatch */ 727 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 728 "%s: merge failed, capabilities mismatch\n", __func__); 729 ic->ic_stats.is_ibss_capmismatch++; 730 return 0; 731 } 732 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 733 "%s: new bssid %s: %s preamble, %s slot time%s\n", __func__, 734 ether_sprintf(ni->ni_bssid), 735 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 736 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 737 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "" 738 ); 739 return ieee80211_sta_join(ic, ni); 740} 741 742/* 743 * Join the specified IBSS/BSS network. The node is assumed to 744 * be passed in with a held reference. 745 */ 746int 747ieee80211_sta_join(struct ieee80211com *ic, struct ieee80211_node *selbs) 748{ 749 struct ieee80211_node *obss; 750 751 if (ic->ic_opmode == IEEE80211_M_IBSS) { 752 /* 753 * Delete unusable rates; we've already checked 754 * that the negotiated rate set is acceptable. 755 */ 756 ieee80211_fix_rate(ic, selbs, IEEE80211_F_DODEL); 757 /* 758 * Create the neighbor table; it will already 759 * exist if we are simply switching mastership. 760 */ 761 if (ic->ic_sta == NULL) { 762 ic->ic_sta = ieee80211_node_table_alloc(ic, 763 "neighbor", ic->ic_inact_run, 764 ieee80211_timeout_stations); 765 if (ic->ic_sta == NULL) { 766 /* 767 * Should remain in SCAN state and retry. 768 */ 769 /* XXX stat+msg */ 770 return 0; 771 } 772 } 773 } 774 775 /* 776 * Committed to selbs, setup state. 777 */ 778 obss = ic->ic_bss; 779 ic->ic_bss = selbs; 780 if (obss != NULL) 781 ieee80211_free_node(obss); 782 /* 783 * Set the erp state (mostly the slot time) to deal with 784 * the auto-select case; this should be redundant if the 785 * mode is locked. 786 */ 787 ic->ic_curmode = ieee80211_chan2mode(ic, selbs->ni_chan); 788 ieee80211_reset_erp(ic); 789 ieee80211_wme_initparams(ic); 790 if (ic->ic_opmode == IEEE80211_M_IBSS) 791 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 792 else 793 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 794 return 1; 795} 796 797/* 798 * Leave the specified IBSS/BSS network. The node is assumed to 799 * be passed in with a held reference. 800 */ 801void 802ieee80211_sta_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 803{ 804 ic->ic_node_cleanup(ni); 805 ieee80211_notify_node_leave(ic, ni); 806} 807 808static struct ieee80211_node * 809node_alloc(struct ieee80211_node_table *nt) 810{ 811 struct ieee80211_node *ni; 812 813 MALLOC(ni, struct ieee80211_node *, sizeof(struct ieee80211_node), 814 M_80211_NODE, M_NOWAIT | M_ZERO); 815 return ni; 816} 817 818/* 819 * Reclaim any resources in a node and reset any critical 820 * state. Typically nodes are free'd immediately after, 821 * but in some cases the storage may be reused so we need 822 * to insure consistent state (should probably fix that). 823 */ 824static void 825node_cleanup(struct ieee80211_node *ni) 826{ 827#define N(a) (sizeof(a)/sizeof(a[0])) 828 struct ieee80211com *ic = ni->ni_ic; 829 int i, qlen; 830 831 /* NB: preserve ni_table */ 832 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) { 833 ic->ic_ps_sta--; 834 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; 835 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 836 "[%s] power save mode off, %u sta's in ps mode\n", 837 ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta); 838 } 839 840 /* 841 * Drain power save queue and, if needed, clear TIM. 842 */ 843 IEEE80211_NODE_SAVEQ_DRAIN(ni, qlen); 844 if (qlen != 0 && ic->ic_set_tim != NULL) 845 ic->ic_set_tim(ic, ni, 0); 846 847 ni->ni_associd = 0; 848 if (ni->ni_challenge != NULL) { 849 FREE(ni->ni_challenge, M_DEVBUF); 850 ni->ni_challenge = NULL; 851 } 852 /* 853 * Preserve SSID, WPA, and WME ie's so the bss node is 854 * reusable during a re-auth/re-assoc state transition. 855 * If we remove these data they will not be recreated 856 * because they come from a probe-response or beacon frame 857 * which cannot be expected prior to the association-response. 858 * This should not be an issue when operating in other modes 859 * as stations leaving always go through a full state transition 860 * which will rebuild this state. 861 * 862 * XXX does this leave us open to inheriting old state? 863 */ 864 for (i = 0; i < N(ni->ni_rxfrag); i++) 865 if (ni->ni_rxfrag[i] != NULL) { 866 m_freem(ni->ni_rxfrag[i]); 867 ni->ni_rxfrag[i] = NULL; 868 } 869 ieee80211_crypto_delkey(ic, &ni->ni_ucastkey); 870#undef N 871} 872 873static void 874node_free(struct ieee80211_node *ni) 875{ 876 struct ieee80211com *ic = ni->ni_ic; 877 878 ic->ic_node_cleanup(ni); 879 if (ni->ni_wpa_ie != NULL) 880 FREE(ni->ni_wpa_ie, M_DEVBUF); 881 if (ni->ni_wme_ie != NULL) 882 FREE(ni->ni_wme_ie, M_DEVBUF); 883 IEEE80211_NODE_SAVEQ_DESTROY(ni); 884 FREE(ni, M_80211_NODE); 885} 886 887static u_int8_t 888node_getrssi(const struct ieee80211_node *ni) 889{ 890 return ni->ni_rssi; 891} 892 893static void 894ieee80211_setup_node(struct ieee80211_node_table *nt, 895 struct ieee80211_node *ni, const u_int8_t *macaddr) 896{ 897 struct ieee80211com *ic = nt->nt_ic; 898 int hash; 899 900 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 901 "%s %s in %s table\n", __func__, 902 ether_sprintf(macaddr), nt->nt_name); 903 904 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 905 hash = IEEE80211_NODE_HASH(macaddr); 906 ieee80211_node_initref(ni); /* mark referenced */ 907 ni->ni_chan = IEEE80211_CHAN_ANYC; 908 ni->ni_authmode = IEEE80211_AUTH_OPEN; 909 ni->ni_txpower = ic->ic_txpowlimit; /* max power */ 910 ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE); 911 ni->ni_inact_reload = nt->nt_inact_init; 912 ni->ni_inact = ni->ni_inact_reload; 913 IEEE80211_NODE_SAVEQ_INIT(ni, "unknown"); 914 915 IEEE80211_NODE_LOCK(nt); 916 TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list); 917 LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash); 918 ni->ni_table = nt; 919 ni->ni_ic = ic; 920 IEEE80211_NODE_UNLOCK(nt); 921} 922 923struct ieee80211_node * 924ieee80211_alloc_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 925{ 926 struct ieee80211com *ic = nt->nt_ic; 927 struct ieee80211_node *ni; 928 929 ni = ic->ic_node_alloc(nt); 930 if (ni != NULL) 931 ieee80211_setup_node(nt, ni, macaddr); 932 else 933 ic->ic_stats.is_rx_nodealloc++; 934 return ni; 935} 936 937struct ieee80211_node * 938ieee80211_dup_bss(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 939{ 940 struct ieee80211com *ic = nt->nt_ic; 941 struct ieee80211_node *ni; 942 943 ni = ic->ic_node_alloc(nt); 944 if (ni != NULL) { 945 ieee80211_setup_node(nt, ni, macaddr); 946 /* 947 * Inherit from ic_bss. 948 */ 949 ni->ni_authmode = ic->ic_bss->ni_authmode; 950 ni->ni_txpower = ic->ic_bss->ni_txpower; 951 ni->ni_vlan = ic->ic_bss->ni_vlan; /* XXX?? */ 952 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); 953 ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan); 954 ni->ni_rsn = ic->ic_bss->ni_rsn; 955 } else 956 ic->ic_stats.is_rx_nodealloc++; 957 return ni; 958} 959 960static struct ieee80211_node * 961#ifdef IEEE80211_DEBUG_REFCNT 962_ieee80211_find_node_debug(struct ieee80211_node_table *nt, 963 const u_int8_t *macaddr, const char *func, int line) 964#else 965_ieee80211_find_node(struct ieee80211_node_table *nt, 966 const u_int8_t *macaddr) 967#endif 968{ 969 struct ieee80211_node *ni; 970 int hash; 971 972 IEEE80211_NODE_LOCK_ASSERT(nt); 973 974 hash = IEEE80211_NODE_HASH(macaddr); 975 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 976 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) { 977 ieee80211_ref_node(ni); /* mark referenced */ 978#ifdef IEEE80211_DEBUG_REFCNT 979 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 980 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 981 ether_sprintf(ni->ni_macaddr), 982 ieee80211_node_refcnt(ni)); 983#endif 984 return ni; 985 } 986 } 987 return NULL; 988} 989#ifdef IEEE80211_DEBUG_REFCNT 990#define _ieee80211_find_node(nt, mac) \ 991 _ieee80211_find_node_debug(nt, mac, func, line) 992#endif 993 994struct ieee80211_node * 995#ifdef IEEE80211_DEBUG_REFCNT 996ieee80211_find_node_debug(struct ieee80211_node_table *nt, 997 const u_int8_t *macaddr, const char *func, int line) 998#else 999ieee80211_find_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 1000#endif 1001{ 1002 struct ieee80211_node *ni; 1003 1004 IEEE80211_NODE_LOCK(nt); 1005 ni = _ieee80211_find_node(nt, macaddr); 1006 IEEE80211_NODE_UNLOCK(nt); 1007 return ni; 1008} 1009 1010/* 1011 * Fake up a node; this handles node discovery in adhoc mode. 1012 * Note that for the driver's benefit we we treat this like 1013 * an association so the driver has an opportunity to setup 1014 * it's private state. 1015 */ 1016struct ieee80211_node * 1017ieee80211_fakeup_adhoc_node(struct ieee80211_node_table *nt, 1018 const u_int8_t macaddr[IEEE80211_ADDR_LEN]) 1019{ 1020 struct ieee80211com *ic = nt->nt_ic; 1021 struct ieee80211_node *ni; 1022 1023 ni = ieee80211_dup_bss(nt, macaddr); 1024 if (ni != NULL) { 1025 /* XXX no rate negotiation; just dup */ 1026 ni->ni_rates = ic->ic_bss->ni_rates; 1027 if (ic->ic_newassoc != NULL) 1028 ic->ic_newassoc(ic, ni, 1); 1029 /* XXX not right for 802.1x/WPA */ 1030 ieee80211_node_authorize(ic, ni); 1031 ieee80211_ref_node(ni); /* hold reference */ 1032 } 1033 return ni; 1034} 1035 1036/* 1037 * Locate the node for sender, track state, and then pass the 1038 * (referenced) node up to the 802.11 layer for its use. We 1039 * are required to pass some node so we fall back to ic_bss 1040 * when this frame is from an unknown sender. The 802.11 layer 1041 * knows this means the sender wasn't in the node table and 1042 * acts accordingly. 1043 */ 1044struct ieee80211_node * 1045#ifdef IEEE80211_DEBUG_REFCNT 1046ieee80211_find_rxnode_debug(struct ieee80211com *ic, 1047 const struct ieee80211_frame_min *wh, const char *func, int line) 1048#else 1049ieee80211_find_rxnode(struct ieee80211com *ic, 1050 const struct ieee80211_frame_min *wh) 1051#endif 1052{ 1053#define IS_CTL(wh) \ 1054 ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL) 1055#define IS_PSPOLL(wh) \ 1056 ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 1057 struct ieee80211_node_table *nt; 1058 struct ieee80211_node *ni; 1059 1060 /* XXX may want scanned nodes in the neighbor table for adhoc */ 1061 if (ic->ic_opmode == IEEE80211_M_STA || 1062 ic->ic_opmode == IEEE80211_M_MONITOR || 1063 (ic->ic_flags & IEEE80211_F_SCAN)) 1064 nt = &ic->ic_scan; 1065 else 1066 nt = ic->ic_sta; 1067 /* XXX check ic_bss first in station mode */ 1068 /* XXX 4-address frames? */ 1069 IEEE80211_NODE_LOCK(nt); 1070 if (IS_CTL(wh) && !IS_PSPOLL(wh) /*&& !IS_RTS(ah)*/) 1071 ni = _ieee80211_find_node(nt, wh->i_addr1); 1072 else 1073 ni = _ieee80211_find_node(nt, wh->i_addr2); 1074 IEEE80211_NODE_UNLOCK(nt); 1075 1076 return (ni != NULL ? ni : ieee80211_ref_node(ic->ic_bss)); 1077#undef IS_PSPOLL 1078#undef IS_CTL 1079} 1080 1081/* 1082 * Return a reference to the appropriate node for sending 1083 * a data frame. This handles node discovery in adhoc networks. 1084 */ 1085struct ieee80211_node * 1086#ifdef IEEE80211_DEBUG_REFCNT 1087ieee80211_find_txnode_debug(struct ieee80211com *ic, const u_int8_t *macaddr, 1088 const char *func, int line) 1089#else 1090ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr) 1091#endif 1092{ 1093 struct ieee80211_node_table *nt = ic->ic_sta; 1094 struct ieee80211_node *ni; 1095 1096 /* 1097 * The destination address should be in the node table 1098 * unless we are operating in station mode or this is a 1099 * multicast/broadcast frame. 1100 */ 1101 if (nt == NULL || IEEE80211_IS_MULTICAST(macaddr)) 1102 return ieee80211_ref_node(ic->ic_bss); 1103 1104 /* XXX can't hold lock across dup_bss 'cuz of recursive locking */ 1105 IEEE80211_NODE_LOCK(nt); 1106 ni = _ieee80211_find_node(nt, macaddr); 1107 IEEE80211_NODE_UNLOCK(nt); 1108 1109 if (ni == NULL) { 1110 if (ic->ic_opmode == IEEE80211_M_IBSS || 1111 ic->ic_opmode == IEEE80211_M_AHDEMO) 1112 ni = ieee80211_fakeup_adhoc_node(nt, macaddr); 1113 else { 1114 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 1115 "[%s] no node, discard frame (%s)\n", 1116 ether_sprintf(macaddr), __func__); 1117 ic->ic_stats.is_tx_nonode++; 1118 } 1119 } 1120 return ni; 1121} 1122 1123/* 1124 * Like find but search based on the channel too. 1125 */ 1126struct ieee80211_node * 1127#ifdef IEEE80211_DEBUG_REFCNT 1128ieee80211_find_node_with_channel_debug(struct ieee80211_node_table *nt, 1129 const u_int8_t *macaddr, struct ieee80211_channel *chan, 1130 const char *func, int line) 1131#else 1132ieee80211_find_node_with_channel(struct ieee80211_node_table *nt, 1133 const u_int8_t *macaddr, struct ieee80211_channel *chan) 1134#endif 1135{ 1136 struct ieee80211_node *ni; 1137 int hash; 1138 1139 hash = IEEE80211_NODE_HASH(macaddr); 1140 IEEE80211_NODE_LOCK(nt); 1141 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 1142 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && 1143 ni->ni_chan == chan) { 1144 ieee80211_ref_node(ni); /* mark referenced */ 1145 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1146#ifdef IEEE80211_DEBUG_REFCNT 1147 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 1148#else 1149 "%s %s refcnt %d\n", __func__, 1150#endif 1151 ether_sprintf(ni->ni_macaddr), 1152 ieee80211_node_refcnt(ni)); 1153 break; 1154 } 1155 } 1156 IEEE80211_NODE_UNLOCK(nt); 1157 return ni; 1158} 1159 1160/* 1161 * Like find but search based on the ssid too. 1162 */ 1163struct ieee80211_node * 1164#ifdef IEEE80211_DEBUG_REFCNT 1165ieee80211_find_node_with_ssid_debug(struct ieee80211_node_table *nt, 1166 const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid, 1167 const char *func, int line) 1168#else 1169ieee80211_find_node_with_ssid(struct ieee80211_node_table *nt, 1170 const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid) 1171#endif 1172{ 1173 struct ieee80211com *ic = nt->nt_ic; 1174 struct ieee80211_node *ni; 1175 int hash; 1176 1177 hash = IEEE80211_NODE_HASH(macaddr); 1178 IEEE80211_NODE_LOCK(nt); 1179 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 1180 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && 1181 ni->ni_esslen == ic->ic_des_esslen && 1182 memcmp(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen) == 0) { 1183 ieee80211_ref_node(ni); /* mark referenced */ 1184 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1185#ifdef IEEE80211_DEBUG_REFCNT 1186 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 1187#else 1188 "%s %s refcnt %d\n", __func__, 1189#endif 1190 ether_sprintf(ni->ni_macaddr), 1191 ieee80211_node_refcnt(ni)); 1192 break; 1193 } 1194 } 1195 IEEE80211_NODE_UNLOCK(nt); 1196 return ni; 1197} 1198 1199 1200static void 1201_ieee80211_free_node(struct ieee80211_node *ni) 1202{ 1203 struct ieee80211com *ic = ni->ni_ic; 1204 struct ieee80211_node_table *nt = ni->ni_table; 1205 1206 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1207 "%s %s in %s table\n", __func__, ether_sprintf(ni->ni_macaddr), 1208 nt != NULL ? nt->nt_name : "<gone>"); 1209 1210 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1211 if (nt != NULL) { 1212 TAILQ_REMOVE(&nt->nt_node, ni, ni_list); 1213 LIST_REMOVE(ni, ni_hash); 1214 } 1215 ic->ic_node_free(ni); 1216} 1217 1218void 1219#ifdef IEEE80211_DEBUG_REFCNT 1220ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line) 1221#else 1222ieee80211_free_node(struct ieee80211_node *ni) 1223#endif 1224{ 1225 struct ieee80211_node_table *nt = ni->ni_table; 1226 1227#ifdef IEEE80211_DEBUG_REFCNT 1228 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1229 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 1230 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1); 1231#endif 1232 if (ieee80211_node_dectestref(ni)) { 1233 /* 1234 * Beware; if the node is marked gone then it's already 1235 * been removed from the table and we cannot assume the 1236 * table still exists. Regardless, there's no need to lock 1237 * the table. 1238 */ 1239 if (ni->ni_table != NULL) { 1240 IEEE80211_NODE_LOCK(nt); 1241 _ieee80211_free_node(ni); 1242 IEEE80211_NODE_UNLOCK(nt); 1243 } else 1244 _ieee80211_free_node(ni); 1245 } 1246} 1247 1248/* 1249 * Reclaim a node. If this is the last reference count then 1250 * do the normal free work. Otherwise remove it from the node 1251 * table and mark it gone by clearing the back-reference. 1252 */ 1253static void 1254node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni) 1255{ 1256 1257 if (!ieee80211_node_dectestref(ni)) { 1258 /* 1259 * Other references are present, just remove the 1260 * node from the table so it cannot be found. When 1261 * the references are dropped storage will be 1262 * reclaimed. This normally only happens for ic_bss. 1263 */ 1264 TAILQ_REMOVE(&nt->nt_node, ni, ni_list); 1265 LIST_REMOVE(ni, ni_hash); 1266 ni->ni_table = NULL; /* clear reference */ 1267 } else 1268 _ieee80211_free_node(ni); 1269} 1270 1271static void 1272ieee80211_free_allnodes_locked(struct ieee80211_node_table *nt) 1273{ 1274 struct ieee80211com *ic = nt->nt_ic; 1275 struct ieee80211_node *ni; 1276 1277 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1278 "%s: free all nodes in %s table\n", __func__, nt->nt_name); 1279 1280 while ((ni = TAILQ_FIRST(&nt->nt_node)) != NULL) { 1281 if (ni->ni_associd != 0) { 1282 if (ic->ic_auth->ia_node_leave != NULL) 1283 ic->ic_auth->ia_node_leave(ic, ni); 1284 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1285 } 1286 node_reclaim(nt, ni); 1287 } 1288 ieee80211_reset_erp(ic); 1289} 1290 1291static void 1292ieee80211_free_allnodes(struct ieee80211_node_table *nt) 1293{ 1294 1295 IEEE80211_NODE_LOCK(nt); 1296 ieee80211_free_allnodes_locked(nt); 1297 IEEE80211_NODE_UNLOCK(nt); 1298} 1299 1300/* 1301 * Timeout entries in the scan cache. 1302 */ 1303static void 1304ieee80211_timeout_scan_candidates(struct ieee80211_node_table *nt) 1305{ 1306 struct ieee80211com *ic = nt->nt_ic; 1307 struct ieee80211_node *ni, *tni; 1308 1309 IEEE80211_NODE_LOCK(nt); 1310 ni = ic->ic_bss; 1311 /* XXX belongs elsewhere */ 1312 if (ni->ni_rxfrag[0] != NULL && ticks > ni->ni_rxfragstamp + hz) { 1313 m_freem(ni->ni_rxfrag[0]); 1314 ni->ni_rxfrag[0] = NULL; 1315 } 1316 TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, tni) { 1317 if (ni->ni_inact && --ni->ni_inact == 0) { 1318 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1319 "[%s] scan candidate purged from cache " 1320 "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr), 1321 ieee80211_node_refcnt(ni)-1); 1322 node_reclaim(nt, ni); 1323 } 1324 } 1325 IEEE80211_NODE_UNLOCK(nt); 1326 1327 nt->nt_inact_timer = IEEE80211_INACT_WAIT; 1328} 1329 1330/* 1331 * Timeout inactive stations and do related housekeeping. 1332 * Note that we cannot hold the node lock while sending a 1333 * frame as this would lead to a LOR. Instead we use a 1334 * generation number to mark nodes that we've scanned and 1335 * drop the lock and restart a scan if we have to time out 1336 * a node. Since we are single-threaded by virtue of 1337 * controlling the inactivity timer we can be sure this will 1338 * process each node only once. 1339 */ 1340static void 1341ieee80211_timeout_stations(struct ieee80211_node_table *nt) 1342{ 1343 struct ieee80211com *ic = nt->nt_ic; 1344 struct ieee80211_node *ni; 1345 u_int gen; 1346 1347 IEEE80211_SCAN_LOCK(nt); 1348 gen = nt->nt_scangen++; 1349 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1350 "%s: sta scangen %u\n", __func__, gen); 1351restart: 1352 IEEE80211_NODE_LOCK(nt); 1353 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1354 if (ni->ni_scangen == gen) /* previously handled */ 1355 continue; 1356 ni->ni_scangen = gen; 1357 /* 1358 * Free fragment if not needed anymore 1359 * (last fragment older than 1s). 1360 * XXX doesn't belong here 1361 */ 1362 if (ni->ni_rxfrag[0] != NULL && 1363 ticks > ni->ni_rxfragstamp + hz) { 1364 m_freem(ni->ni_rxfrag[0]); 1365 ni->ni_rxfrag[0] = NULL; 1366 } 1367 ni->ni_inact--; 1368 if (ni->ni_associd != 0) { 1369 /* 1370 * Age frames on the power save queue. The 1371 * aging interval is 4 times the listen 1372 * interval specified by the station. This 1373 * number is factored into the age calculations 1374 * when the frame is placed on the queue. We 1375 * store ages as time differences we can check 1376 * and/or adjust only the head of the list. 1377 */ 1378 if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) { 1379 struct mbuf *m; 1380 int discard = 0; 1381 1382 IEEE80211_NODE_SAVEQ_LOCK(ni); 1383 while (IF_POLL(&ni->ni_savedq, m) != NULL && 1384 M_AGE_GET(m) < IEEE80211_INACT_WAIT) { 1385IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] discard frame, age %u\n", ether_sprintf(ni->ni_macaddr), M_AGE_GET(m));/*XXX*/ 1386 _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m); 1387 m_freem(m); 1388 discard++; 1389 } 1390 if (m != NULL) 1391 M_AGE_SUB(m, IEEE80211_INACT_WAIT); 1392 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1393 1394 if (discard != 0) { 1395 IEEE80211_DPRINTF(ic, 1396 IEEE80211_MSG_POWER, 1397 "[%s] discard %u frames for age\n", 1398 ether_sprintf(ni->ni_macaddr), 1399 discard); 1400 IEEE80211_NODE_STAT_ADD(ni, 1401 ps_discard, discard); 1402 if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) 1403 ic->ic_set_tim(ic, ni, 0); 1404 } 1405 } 1406 /* 1407 * Probe the station before time it out. We 1408 * send a null data frame which may not be 1409 * universally supported by drivers (need it 1410 * for ps-poll support so it should be...). 1411 */ 1412 if (0 < ni->ni_inact && 1413 ni->ni_inact <= ic->ic_inact_probe) { 1414 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1415 "[%s] probe station due to inactivity\n", 1416 ether_sprintf(ni->ni_macaddr)); 1417 IEEE80211_NODE_UNLOCK(nt); 1418 ieee80211_send_nulldata(ic, ni); 1419 /* XXX stat? */ 1420 goto restart; 1421 } 1422 } 1423 if (ni->ni_inact <= 0) { 1424 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1425 "[%s] station timed out due to inactivity " 1426 "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr), 1427 ieee80211_node_refcnt(ni)); 1428 /* 1429 * Send a deauthenticate frame and drop the station. 1430 * This is somewhat complicated due to reference counts 1431 * and locking. At this point a station will typically 1432 * have a reference count of 1. ieee80211_node_leave 1433 * will do a "free" of the node which will drop the 1434 * reference count. But in the meantime a reference 1435 * wil be held by the deauth frame. The actual reclaim 1436 * of the node will happen either after the tx is 1437 * completed or by ieee80211_node_leave. 1438 * 1439 * Separately we must drop the node lock before sending 1440 * in case the driver takes a lock, as this will result 1441 * in LOR between the node lock and the driver lock. 1442 */ 1443 IEEE80211_NODE_UNLOCK(nt); 1444 if (ni->ni_associd != 0) { 1445 IEEE80211_SEND_MGMT(ic, ni, 1446 IEEE80211_FC0_SUBTYPE_DEAUTH, 1447 IEEE80211_REASON_AUTH_EXPIRE); 1448 } 1449 ieee80211_node_leave(ic, ni); 1450 ic->ic_stats.is_node_timeout++; 1451 goto restart; 1452 } 1453 } 1454 IEEE80211_NODE_UNLOCK(nt); 1455 1456 IEEE80211_SCAN_UNLOCK(nt); 1457 1458 nt->nt_inact_timer = IEEE80211_INACT_WAIT; 1459} 1460 1461void 1462ieee80211_iterate_nodes(struct ieee80211_node_table *nt, ieee80211_iter_func *f, void *arg) 1463{ 1464 struct ieee80211_node *ni; 1465 u_int gen; 1466 1467 IEEE80211_SCAN_LOCK(nt); 1468 gen = nt->nt_scangen++; 1469 1470 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1471 "%s: sta scangen %u\n", __func__, gen); 1472restart: 1473 IEEE80211_NODE_LOCK(nt); 1474 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1475 if (ni->ni_scangen != gen) { 1476 ni->ni_scangen = gen; 1477 (void) ieee80211_ref_node(ni); 1478 IEEE80211_NODE_UNLOCK(nt); 1479 (*f)(arg, ni); 1480 ieee80211_free_node(ni); 1481 goto restart; 1482 } 1483 } 1484 IEEE80211_NODE_UNLOCK(nt); 1485 1486 IEEE80211_SCAN_UNLOCK(nt); 1487} 1488 1489void 1490ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni) 1491{ 1492 printf("0x%p: mac %s refcnt %d\n", ni, 1493 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); 1494 printf("\tscangen %u authmode %u flags 0x%x\n", 1495 ni->ni_scangen, ni->ni_authmode, ni->ni_flags); 1496 printf("\tassocid 0x%x txpower %u vlan %u\n", 1497 ni->ni_associd, ni->ni_txpower, ni->ni_vlan); 1498 printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n", 1499 ni->ni_txseqs[0], 1500 ni->ni_rxseqs[0] >> IEEE80211_SEQ_SEQ_SHIFT, 1501 ni->ni_rxseqs[0] & IEEE80211_SEQ_FRAG_MASK, 1502 ni->ni_rxfragstamp); 1503 printf("\trstamp %u rssi %u intval %u capinfo 0x%x\n", 1504 ni->ni_rstamp, ni->ni_rssi, ni->ni_intval, ni->ni_capinfo); 1505 printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n", 1506 ether_sprintf(ni->ni_bssid), 1507 ni->ni_esslen, ni->ni_essid, 1508 ni->ni_chan->ic_freq, ni->ni_chan->ic_flags); 1509 printf("\tfails %u inact %u txrate %u\n", 1510 ni->ni_fails, ni->ni_inact, ni->ni_txrate); 1511} 1512 1513void 1514ieee80211_dump_nodes(struct ieee80211_node_table *nt) 1515{ 1516 ieee80211_iterate_nodes(nt, 1517 (ieee80211_iter_func *) ieee80211_dump_node, nt); 1518} 1519 1520/* 1521 * Handle a station joining an 11g network. 1522 */ 1523static void 1524ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1525{ 1526 1527 /* 1528 * Station isn't capable of short slot time. Bump 1529 * the count of long slot time stations and disable 1530 * use of short slot time. Note that the actual switch 1531 * over to long slot time use may not occur until the 1532 * next beacon transmission (per sec. 7.3.1.4 of 11g). 1533 */ 1534 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { 1535 ic->ic_longslotsta++; 1536 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1537 "[%s] station needs long slot time, count %d\n", 1538 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); 1539 /* XXX vap's w/ conflicting needs won't work */ 1540 ieee80211_set_shortslottime(ic, 0); 1541 } 1542 /* 1543 * If the new station is not an ERP station 1544 * then bump the counter and enable protection 1545 * if configured. 1546 */ 1547 if (!ieee80211_iserp_rateset(ic, &ni->ni_rates)) { 1548 ic->ic_nonerpsta++; 1549 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1550 "[%s] station is !ERP, %d non-ERP stations associated\n", 1551 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); 1552 /* 1553 * If protection is configured, enable it. 1554 */ 1555 if (ic->ic_protmode != IEEE80211_PROT_NONE) { 1556 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1557 "%s: enable use of protection\n", __func__); 1558 ic->ic_flags |= IEEE80211_F_USEPROT; 1559 } 1560 /* 1561 * If station does not support short preamble 1562 * then we must enable use of Barker preamble. 1563 */ 1564 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) { 1565 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1566 "[%s] station needs long preamble\n", 1567 ether_sprintf(ni->ni_macaddr)); 1568 ic->ic_flags |= IEEE80211_F_USEBARKER; 1569 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1570 } 1571 } else 1572 ni->ni_flags |= IEEE80211_NODE_ERP; 1573} 1574 1575void 1576ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int resp) 1577{ 1578 int newassoc; 1579 1580 if (ni->ni_associd == 0) { 1581 u_int16_t aid; 1582 1583 /* 1584 * It would be good to search the bitmap 1585 * more efficiently, but this will do for now. 1586 */ 1587 for (aid = 1; aid < ic->ic_max_aid; aid++) { 1588 if (!IEEE80211_AID_ISSET(aid, 1589 ic->ic_aid_bitmap)) 1590 break; 1591 } 1592 if (aid >= ic->ic_max_aid) { 1593 IEEE80211_SEND_MGMT(ic, ni, resp, 1594 IEEE80211_REASON_ASSOC_TOOMANY); 1595 ieee80211_node_leave(ic, ni); 1596 return; 1597 } 1598 ni->ni_associd = aid | 0xc000; 1599 IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap); 1600 ic->ic_sta_assoc++; 1601 newassoc = 1; 1602 if (ic->ic_curmode == IEEE80211_MODE_11G || 1603 ic->ic_curmode == IEEE80211_MODE_TURBO_G) 1604 ieee80211_node_join_11g(ic, ni); 1605 } else 1606 newassoc = 0; 1607 1608 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, 1609 "[%s] station %sassociated at aid %d: %s preamble, %s slot time%s%s\n", 1610 ether_sprintf(ni->ni_macaddr), newassoc ? "" : "re", 1611 IEEE80211_NODE_AID(ni), 1612 ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long", 1613 ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long", 1614 ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "", 1615 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "" 1616 ); 1617 1618 /* give driver a chance to setup state like ni_txrate */ 1619 if (ic->ic_newassoc != NULL) 1620 ic->ic_newassoc(ic, ni, newassoc); 1621 ni->ni_inact_reload = ic->ic_inact_auth; 1622 ni->ni_inact = ni->ni_inact_reload; 1623 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS); 1624 /* tell the authenticator about new station */ 1625 if (ic->ic_auth->ia_node_join != NULL) 1626 ic->ic_auth->ia_node_join(ic, ni); 1627 ieee80211_notify_node_join(ic, ni, newassoc); 1628} 1629 1630/* 1631 * Handle a station leaving an 11g network. 1632 */ 1633static void 1634ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1635{ 1636 1637 KASSERT(ic->ic_curmode == IEEE80211_MODE_11G || 1638 ic->ic_curmode == IEEE80211_MODE_TURBO_G, 1639 ("not in 11g, curmode %x", ic->ic_curmode)); 1640 1641 /* 1642 * If a long slot station do the slot time bookkeeping. 1643 */ 1644 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { 1645 KASSERT(ic->ic_longslotsta > 0, 1646 ("bogus long slot station count %d", ic->ic_longslotsta)); 1647 ic->ic_longslotsta--; 1648 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1649 "[%s] long slot time station leaves, count now %d\n", 1650 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); 1651 if (ic->ic_longslotsta == 0) { 1652 /* 1653 * Re-enable use of short slot time if supported 1654 * and not operating in IBSS mode (per spec). 1655 */ 1656 if ((ic->ic_caps & IEEE80211_C_SHSLOT) && 1657 ic->ic_opmode != IEEE80211_M_IBSS) { 1658 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1659 "%s: re-enable use of short slot time\n", 1660 __func__); 1661 ieee80211_set_shortslottime(ic, 1); 1662 } 1663 } 1664 } 1665 /* 1666 * If a non-ERP station do the protection-related bookkeeping. 1667 */ 1668 if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) { 1669 KASSERT(ic->ic_nonerpsta > 0, 1670 ("bogus non-ERP station count %d", ic->ic_nonerpsta)); 1671 ic->ic_nonerpsta--; 1672 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1673 "[%s] non-ERP station leaves, count now %d\n", 1674 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); 1675 if (ic->ic_nonerpsta == 0) { 1676 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1677 "%s: disable use of protection\n", __func__); 1678 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1679 /* XXX verify mode? */ 1680 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) { 1681 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1682 "%s: re-enable use of short preamble\n", 1683 __func__); 1684 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1685 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1686 } 1687 } 1688 } 1689} 1690 1691/* 1692 * Handle bookkeeping for station deauthentication/disassociation 1693 * when operating as an ap. 1694 */ 1695void 1696ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 1697{ 1698 1699 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, 1700 "[%s] station with aid %d leaves\n", 1701 ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_AID(ni)); 1702 1703 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || 1704 ic->ic_opmode == IEEE80211_M_IBSS || 1705 ic->ic_opmode == IEEE80211_M_AHDEMO, 1706 ("unexpected operating mode %u", ic->ic_opmode)); 1707 /* 1708 * If node wasn't previously associated all 1709 * we need to do is reclaim the reference. 1710 */ 1711 /* XXX ibss mode bypasses 11g and notification */ 1712 if (ni->ni_associd == 0) 1713 goto done; 1714 /* 1715 * Tell the authenticator the station is leaving. 1716 * Note that we must do this before yanking the 1717 * association id as the authenticator uses the 1718 * associd to locate it's state block. 1719 */ 1720 if (ic->ic_auth->ia_node_leave != NULL) 1721 ic->ic_auth->ia_node_leave(ic, ni); 1722 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1723 ni->ni_associd = 0; 1724 ic->ic_sta_assoc--; 1725 1726 if (ic->ic_curmode == IEEE80211_MODE_11G || 1727 ic->ic_curmode == IEEE80211_MODE_TURBO_G) 1728 ieee80211_node_leave_11g(ic, ni); 1729 /* 1730 * Cleanup station state. In particular clear various 1731 * state that might otherwise be reused if the node 1732 * is reused before the reference count goes to zero 1733 * (and memory is reclaimed). 1734 */ 1735 ieee80211_sta_leave(ic, ni); 1736done: 1737 ni->ni_inact_reload = ic->ic_inact_init; /* just in case */ 1738 ieee80211_free_node(ni); 1739} 1740 1741u_int8_t 1742ieee80211_getrssi(struct ieee80211com *ic) 1743{ 1744#define NZ(x) ((x) == 0 ? 1 : (x)) 1745 struct ieee80211_node_table *nt = ic->ic_sta; 1746 u_int32_t rssi_samples, rssi_total; 1747 struct ieee80211_node *ni; 1748 1749 rssi_total = 0; 1750 rssi_samples = 0; 1751 switch (ic->ic_opmode) { 1752 case IEEE80211_M_IBSS: /* average of all ibss neighbors */ 1753 nt = ic->ic_sta; 1754 if (nt == NULL) 1755 break; 1756 /* XXX locking */ 1757 TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list) 1758 if (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) { 1759 rssi_samples++; 1760 rssi_total += ic->ic_node_getrssi(ni); 1761 } 1762 break; 1763 case IEEE80211_M_AHDEMO: /* average of all neighbors */ 1764 nt = ic->ic_sta; 1765 if (nt == NULL) 1766 break; 1767 /* XXX locking */ 1768 TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list) { 1769 rssi_samples++; 1770 rssi_total += ic->ic_node_getrssi(ni); 1771 } 1772 break; 1773 case IEEE80211_M_HOSTAP: /* average of all associated stations */ 1774 nt = ic->ic_sta; 1775 if (nt == NULL) 1776 break; 1777 /* XXX locking */ 1778 TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list) 1779 if (IEEE80211_AID(ni->ni_associd) != 0) { 1780 rssi_samples++; 1781 rssi_total += ic->ic_node_getrssi(ni); 1782 } 1783 break; 1784 case IEEE80211_M_MONITOR: /* XXX */ 1785 case IEEE80211_M_STA: /* use stats from associated ap */ 1786 default: 1787 if (ic->ic_bss != NULL) 1788 rssi_total = ic->ic_node_getrssi(ic->ic_bss); 1789 rssi_samples = 1; 1790 break; 1791 } 1792 return rssi_total / NZ(rssi_samples); 1793#undef NZ 1794} 1795 1796/* 1797 * Indicate whether there are frames queued for a station in power-save mode. 1798 */ 1799static void 1800ieee80211_set_tim(struct ieee80211com *ic, struct ieee80211_node *ni, int set) 1801{ 1802 u_int16_t aid; 1803 1804 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || 1805 ic->ic_opmode == IEEE80211_M_IBSS, 1806 ("operating mode %u", ic->ic_opmode)); 1807 1808 aid = IEEE80211_AID(ni->ni_associd); 1809 KASSERT(aid < ic->ic_max_aid, 1810 ("bogus aid %u, max %u", aid, ic->ic_max_aid)); 1811 1812 IEEE80211_BEACON_LOCK(ic); 1813 if (set != (isset(ic->ic_tim_bitmap, aid) != 0)) { 1814 if (set) { 1815 setbit(ic->ic_tim_bitmap, aid); 1816 ic->ic_ps_pending++; 1817 } else { 1818 clrbit(ic->ic_tim_bitmap, aid); 1819 ic->ic_ps_pending--; 1820 } 1821 ic->ic_flags |= IEEE80211_F_TIMUPDATE; 1822 } 1823 IEEE80211_BEACON_UNLOCK(ic); 1824} 1825 1826/* 1827 * Node table support. 1828 */ 1829 1830static void 1831ieee80211_node_table_init(struct ieee80211com *ic, 1832 struct ieee80211_node_table *nt, 1833 const char *name, int inact, 1834 void (*timeout)(struct ieee80211_node_table *)) 1835{ 1836 1837 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1838 "%s %s table, inact %u\n", __func__, name, inact); 1839 1840 nt->nt_ic = ic; 1841 /* XXX need unit */ 1842 IEEE80211_NODE_LOCK_INIT(nt, ic->ic_ifp->if_xname); 1843 IEEE80211_SCAN_LOCK_INIT(nt, ic->ic_ifp->if_xname); 1844 TAILQ_INIT(&nt->nt_node); 1845 nt->nt_name = name; 1846 nt->nt_scangen = 1; 1847 nt->nt_inact_init = inact; 1848 nt->nt_timeout = timeout; 1849} 1850 1851static struct ieee80211_node_table * 1852ieee80211_node_table_alloc(struct ieee80211com *ic, 1853 const char *name, int inact, 1854 void (*timeout)(struct ieee80211_node_table *)) 1855{ 1856 struct ieee80211_node_table *nt; 1857 1858 MALLOC(nt, struct ieee80211_node_table *, 1859 sizeof(struct ieee80211_node_table), 1860 M_DEVBUF, M_NOWAIT | M_ZERO); 1861 if (nt == NULL) { 1862 printf("%s: no memory node table!\n", __func__); 1863 return NULL; 1864 } 1865 ieee80211_node_table_init(ic, nt, name, inact, timeout); 1866 return nt; 1867} 1868 1869void 1870ieee80211_node_table_reset(struct ieee80211_node_table *nt) 1871{ 1872 1873 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1874 "%s %s table\n", __func__, nt->nt_name); 1875 1876 IEEE80211_NODE_LOCK(nt); 1877 nt->nt_inact_timer = 0; 1878 ieee80211_free_allnodes_locked(nt); 1879 IEEE80211_NODE_UNLOCK(nt); 1880} 1881 1882static void 1883ieee80211_node_table_cleanup(struct ieee80211_node_table *nt) 1884{ 1885 1886 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1887 "%s %s table\n", __func__, nt->nt_name); 1888 1889 ieee80211_free_allnodes_locked(nt); 1890 IEEE80211_SCAN_LOCK_DESTROY(nt); 1891 IEEE80211_NODE_LOCK_DESTROY(nt); 1892} 1893 1894/* 1895 * NB: public for use in ieee80211_proto.c 1896 */ 1897void 1898ieee80211_node_table_free(struct ieee80211_node_table *nt) 1899{ 1900 1901 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1902 "%s %s table\n", __func__, nt->nt_name); 1903 1904 IEEE80211_NODE_LOCK(nt); 1905 nt->nt_inact_timer = 0; 1906 ieee80211_node_table_cleanup(nt); 1907 FREE(nt, M_DEVBUF); 1908} 1909