ieee80211_node.c revision 139521
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2004 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 139521 2004-12-31 21:22:12Z 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} 202 203void 204ieee80211_node_unauthorize(struct ieee80211com *ic, struct ieee80211_node *ni) 205{ 206 ni->ni_flags &= ~IEEE80211_NODE_AUTH; 207} 208 209/* 210 * Set/change the channel. The rate set is also updated as 211 * to insure a consistent view by drivers. 212 */ 213static __inline void 214ieee80211_set_chan(struct ieee80211com *ic, 215 struct ieee80211_node *ni, struct ieee80211_channel *chan) 216{ 217 ni->ni_chan = chan; 218 ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, chan)]; 219} 220 221/* 222 * AP scanning support. 223 */ 224 225#ifdef IEEE80211_DEBUG 226static void 227dump_chanlist(const u_char chans[]) 228{ 229 const char *sep; 230 int i; 231 232 sep = " "; 233 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 234 if (isset(chans, i)) { 235 printf("%s%u", sep, i); 236 sep = ", "; 237 } 238} 239#endif /* IEEE80211_DEBUG */ 240 241/* 242 * Initialize the channel set to scan based on the 243 * of available channels and the current PHY mode. 244 */ 245static void 246ieee80211_reset_scan(struct ieee80211com *ic) 247{ 248 249 /* XXX ic_des_chan should be handled with ic_chan_active */ 250 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC) { 251 memset(ic->ic_chan_scan, 0, sizeof(ic->ic_chan_scan)); 252 setbit(ic->ic_chan_scan, 253 ieee80211_chan2ieee(ic, ic->ic_des_chan)); 254 } else 255 memcpy(ic->ic_chan_scan, ic->ic_chan_active, 256 sizeof(ic->ic_chan_active)); 257 /* NB: hack, setup so next_scan starts with the first channel */ 258 if (ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC) 259 ieee80211_set_chan(ic, ic->ic_bss, 260 &ic->ic_channels[IEEE80211_CHAN_MAX]); 261#ifdef IEEE80211_DEBUG 262 if (ieee80211_msg_scan(ic)) { 263 printf("%s: scan set:", __func__); 264 dump_chanlist(ic->ic_chan_scan); 265 printf(" start chan %u\n", 266 ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan)); 267 } 268#endif /* IEEE80211_DEBUG */ 269} 270 271/* 272 * Begin an active scan. 273 */ 274void 275ieee80211_begin_scan(struct ieee80211com *ic, int reset) 276{ 277 278 ic->ic_scan.nt_scangen++; 279 /* 280 * In all but hostap mode scanning starts off in 281 * an active mode before switching to passive. 282 */ 283 if (ic->ic_opmode != IEEE80211_M_HOSTAP) { 284 ic->ic_flags |= IEEE80211_F_ASCAN; 285 ic->ic_stats.is_scan_active++; 286 } else 287 ic->ic_stats.is_scan_passive++; 288 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 289 "begin %s scan in %s mode, scangen %u\n", 290 (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive", 291 ieee80211_phymode_name[ic->ic_curmode], ic->ic_scan.nt_scangen); 292 /* 293 * Clear scan state and flush any previously seen AP's. 294 */ 295 ieee80211_reset_scan(ic); 296 if (reset) 297 ieee80211_free_allnodes(&ic->ic_scan); 298 299 ic->ic_flags |= IEEE80211_F_SCAN; 300 301 /* Scan the next channel. */ 302 ieee80211_next_scan(ic); 303} 304 305/* 306 * Switch to the next channel marked for scanning. 307 */ 308int 309ieee80211_next_scan(struct ieee80211com *ic) 310{ 311 struct ieee80211_channel *chan; 312 313 /* 314 * Insure any previous mgt frame timeouts don't fire. 315 * This assumes the driver does the right thing in 316 * flushing anything queued in the driver and below. 317 */ 318 ic->ic_mgt_timer = 0; 319 320 chan = ic->ic_bss->ni_chan; 321 do { 322 if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) 323 chan = &ic->ic_channels[0]; 324 if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { 325 clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); 326 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 327 "%s: chan %d->%d\n", __func__, 328 ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan), 329 ieee80211_chan2ieee(ic, chan)); 330 ieee80211_set_chan(ic, ic->ic_bss, chan); 331#ifdef notyet 332 /* XXX driver state change */ 333 /* 334 * Scan next channel. If doing an active scan 335 * and the channel is not marked passive-only 336 * then send a probe request. Otherwise just 337 * listen for beacons on the channel. 338 */ 339 if ((ic->ic_flags & IEEE80211_F_ASCAN) && 340 (ni->ni_chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) { 341 IEEE80211_SEND_MGMT(ic, ni, 342 IEEE80211_FC0_SUBTYPE_PROBE_REQ, 0); 343 } 344#else 345 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 346#endif 347 return 1; 348 } 349 } while (chan != ic->ic_bss->ni_chan); 350 ieee80211_end_scan(ic); 351 return 0; 352} 353 354void 355ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) 356{ 357 struct ieee80211_node *ni; 358 359 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 360 "%s: creating ibss\n", __func__); 361 362 /* 363 * Create the station/neighbor table. Note that for adhoc 364 * mode we make the initial inactivity timer longer since 365 * we create nodes only through discovery and they typically 366 * are long-lived associations. 367 */ 368 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 369 ic->ic_sta = ieee80211_node_table_alloc(ic, 370 "station", ic->ic_inact_init, 371 ieee80211_timeout_stations); 372 else 373 ic->ic_sta = ieee80211_node_table_alloc(ic, 374 "neighbor", ic->ic_inact_run, 375 ieee80211_timeout_stations); 376 if (ic->ic_sta == NULL) { 377 /* 378 * Should remain in SCAN state and retry. 379 */ 380 /* XXX stat+msg */ 381 return; 382 } 383 384 ni = ic->ic_bss; 385 IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr); 386 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); 387 ni->ni_esslen = ic->ic_des_esslen; 388 memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); 389 ni->ni_rssi = 0; 390 ni->ni_rstamp = 0; 391 ni->ni_tstamp.tsf = 0; 392 ni->ni_intval = ic->ic_lintval; 393 ni->ni_capinfo = 0; 394 ni->ni_erp = 0; 395 if (ic->ic_flags & IEEE80211_F_PRIVACY) 396 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; 397 if (ic->ic_phytype == IEEE80211_T_FH) { 398 ni->ni_fhdwell = 200; /* XXX */ 399 ni->ni_fhindex = 1; 400 } 401 if (ic->ic_opmode == IEEE80211_M_IBSS) { 402 ic->ic_flags |= IEEE80211_F_SIBSS; 403 ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS; /* XXX */ 404 ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ 405 } 406 /* 407 * Fix the channel and related attributes. 408 */ 409 ieee80211_set_chan(ic, ni, chan); 410 ic->ic_curmode = ieee80211_chan2mode(ic, chan); 411 /* 412 * Do mode-specific rate setup. 413 */ 414 if (ic->ic_curmode == IEEE80211_MODE_11G) { 415 /* 416 * Use a mixed 11b/11g rate set. 417 */ 418 ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11G); 419 } else if (ic->ic_curmode == IEEE80211_MODE_11B) { 420 /* 421 * Force pure 11b rate set. 422 */ 423 ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11B); 424 } 425 /* 426 * Set the erp state (mostly the slot time) to deal with 427 * the auto-select case; this should be redundant if the 428 * mode is locked. 429 */ 430 ieee80211_reset_erp(ic); 431 ieee80211_wme_initparams(ic); 432 433 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 434} 435 436void 437ieee80211_reset_bss(struct ieee80211com *ic) 438{ 439 struct ieee80211_node *ni, *obss; 440 441 ieee80211_node_table_reset(&ic->ic_scan); 442 ni = ieee80211_alloc_node(&ic->ic_scan, ic->ic_myaddr); 443 KASSERT(ni != NULL, ("unable to setup inital BSS node")); 444 obss = ic->ic_bss; 445 ic->ic_bss = ieee80211_ref_node(ni); 446 if (obss != NULL) 447 ieee80211_free_node(obss); 448 if (ic->ic_sta != NULL) { 449 ieee80211_node_table_free(ic->ic_sta); 450 ic->ic_sta = NULL; 451 } 452} 453 454static int 455ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni) 456{ 457 u_int8_t rate; 458 int fail; 459 460 fail = 0; 461 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) 462 fail |= 0x01; 463 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 464 ni->ni_chan != ic->ic_des_chan) 465 fail |= 0x01; 466 if (ic->ic_opmode == IEEE80211_M_IBSS) { 467 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 468 fail |= 0x02; 469 } else { 470 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) 471 fail |= 0x02; 472 } 473 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 474 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 475 fail |= 0x04; 476 } else { 477 /* XXX does this mean privacy is supported or required? */ 478 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) 479 fail |= 0x04; 480 } 481 rate = ieee80211_fix_rate(ic, ni, IEEE80211_F_DONEGO); 482 if (rate & IEEE80211_RATE_BASIC) 483 fail |= 0x08; 484 if (ic->ic_des_esslen != 0 && 485 (ni->ni_esslen != ic->ic_des_esslen || 486 memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0)) 487 fail |= 0x10; 488 if ((ic->ic_flags & IEEE80211_F_DESBSSID) && 489 !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) 490 fail |= 0x20; 491#ifdef IEEE80211_DEBUG 492 if (ieee80211_msg_scan(ic)) { 493 printf(" %c %s", fail ? '-' : '+', 494 ether_sprintf(ni->ni_macaddr)); 495 printf(" %s%c", ether_sprintf(ni->ni_bssid), 496 fail & 0x20 ? '!' : ' '); 497 printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), 498 fail & 0x01 ? '!' : ' '); 499 printf(" %+4d", ni->ni_rssi); 500 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 501 fail & 0x08 ? '!' : ' '); 502 printf(" %4s%c", 503 (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 504 (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 505 "????", 506 fail & 0x02 ? '!' : ' '); 507 printf(" %3s%c ", 508 (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 509 "wep" : "no", 510 fail & 0x04 ? '!' : ' '); 511 ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); 512 printf("%s\n", fail & 0x10 ? "!" : ""); 513 } 514#endif 515 return fail; 516} 517 518static __inline u_int8_t 519maxrate(const struct ieee80211_node *ni) 520{ 521 const struct ieee80211_rateset *rs = &ni->ni_rates; 522 /* NB: assumes rate set is sorted (happens on frame receive) */ 523 return rs->rs_rates[rs->rs_nrates-1] & IEEE80211_RATE_VAL; 524} 525 526/* 527 * Compare the capabilities of two nodes and decide which is 528 * more desirable (return >0 if a is considered better). Note 529 * that we assume compatibility/usability has already been checked 530 * so we don't need to (e.g. validate whether privacy is supported). 531 * Used to select the best scan candidate for association in a BSS. 532 */ 533static int 534ieee80211_node_compare(struct ieee80211com *ic, 535 const struct ieee80211_node *a, 536 const struct ieee80211_node *b) 537{ 538 u_int8_t maxa, maxb; 539 u_int8_t rssia, rssib; 540 541 /* privacy support preferred */ 542 if ((a->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) && 543 (b->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 544 return 1; 545 if ((a->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0 && 546 (b->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)) 547 return -1; 548 549 /* best/max rate preferred if signal level close enough XXX */ 550 maxa = maxrate(a); 551 maxb = maxrate(b); 552 rssia = ic->ic_node_getrssi(a); 553 rssib = ic->ic_node_getrssi(b); 554 if (maxa != maxb && abs(rssib - rssia) < 5) 555 return maxa - maxb; 556 557 /* XXX use freq for channel preference */ 558 /* for now just prefer 5Ghz band to all other bands */ 559 if (IEEE80211_IS_CHAN_5GHZ(a->ni_chan) && 560 !IEEE80211_IS_CHAN_5GHZ(b->ni_chan)) 561 return 1; 562 if (!IEEE80211_IS_CHAN_5GHZ(a->ni_chan) && 563 IEEE80211_IS_CHAN_5GHZ(b->ni_chan)) 564 return -1; 565 566 /* all things being equal, use signal level */ 567 return rssia - rssib; 568} 569 570/* 571 * Complete a scan of potential channels. 572 */ 573void 574ieee80211_end_scan(struct ieee80211com *ic) 575{ 576 struct ieee80211_node *ni, *nextbs, *selbs; 577 struct ieee80211_node_table *nt; 578 579 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "end %s scan\n", 580 (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive"); 581 582 ic->ic_flags &= ~(IEEE80211_F_SCAN | IEEE80211_F_ASCAN); 583 nt = &ic->ic_scan; 584 ni = TAILQ_FIRST(&nt->nt_node); 585 586 ieee80211_notify_scan_done(ic); 587 588 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 589 u_int8_t maxrssi[IEEE80211_CHAN_MAX]; /* XXX off stack? */ 590 int i, bestchan; 591 u_int8_t rssi; 592 593 /* 594 * The passive scan to look for existing AP's completed, 595 * select a channel to camp on. Identify the channels 596 * that already have one or more AP's and try to locate 597 * an unnoccupied one. If that fails, pick a channel that 598 * looks to be quietest. 599 */ 600 memset(maxrssi, 0, sizeof(maxrssi)); 601 for (; ni != NULL; ni = nextbs) { 602 ieee80211_ref_node(ni); 603 nextbs = TAILQ_NEXT(ni, ni_list); 604 rssi = ic->ic_node_getrssi(ni); 605 i = ieee80211_chan2ieee(ic, ni->ni_chan); 606 if (rssi > maxrssi[i]) 607 maxrssi[i] = rssi; 608 ieee80211_unref_node(&ni); 609 } 610 /* XXX select channel more intelligently */ 611 bestchan = -1; 612 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 613 if (isset(ic->ic_chan_active, i)) { 614 /* 615 * If the channel is unoccupied the max rssi 616 * should be zero; just take it. Otherwise 617 * track the channel with the lowest rssi and 618 * use that when all channels appear occupied. 619 */ 620 if (maxrssi[i] == 0) { 621 bestchan = i; 622 break; 623 } 624 if (maxrssi[i] < maxrssi[bestchan]) 625 bestchan = i; 626 } 627 if (bestchan != -1) { 628 ieee80211_create_ibss(ic, &ic->ic_channels[bestchan]); 629 return; 630 } 631 /* no suitable channel, should not happen */ 632 } 633 634 /* 635 * When manually sequencing the state machine; scan just once 636 * regardless of whether we have a candidate or not. The 637 * controlling application is expected to setup state and 638 * initiate an association. 639 */ 640 if (ic->ic_roaming == IEEE80211_ROAMING_MANUAL) 641 return; 642 /* 643 * Automatic sequencing; look for a candidate and 644 * if found join the network. 645 */ 646 if (ni == NULL) { 647 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 648 "%s: no scan candidate\n", __func__); 649 notfound: 650 if (ic->ic_opmode == IEEE80211_M_IBSS && 651 (ic->ic_flags & IEEE80211_F_IBSSON) && 652 ic->ic_des_esslen != 0) { 653 ieee80211_create_ibss(ic, ic->ic_ibss_chan); 654 return; 655 } 656 /* 657 * Reset the list of channels to scan and start again. 658 */ 659 ieee80211_reset_scan(ic); 660 ic->ic_flags |= IEEE80211_F_SCAN; 661 ieee80211_next_scan(ic); 662 return; 663 } 664 selbs = NULL; 665 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "\t%s\n", 666 "macaddr bssid chan rssi rate flag wep essid"); 667 for (; ni != NULL; ni = nextbs) { 668 ieee80211_ref_node(ni); 669 nextbs = TAILQ_NEXT(ni, ni_list); 670 if (ni->ni_fails) { 671 /* 672 * The configuration of the access points may change 673 * during my scan. So delete the entry for the AP 674 * and retry to associate if there is another beacon. 675 */ 676 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 677 "%s: skip scan candidate %s, fails %u\n", 678 __func__, ether_sprintf(ni->ni_macaddr), 679 ni->ni_fails); 680 if (ni->ni_fails++ > 2) 681 ieee80211_free_node(ni); 682 continue; 683 } 684 if (ieee80211_match_bss(ic, ni) == 0) { 685 if (selbs == NULL) 686 selbs = ni; 687 else if (ieee80211_node_compare(ic, ni, selbs) > 0) { 688 ieee80211_unref_node(&selbs); 689 selbs = ni; 690 } else 691 ieee80211_unref_node(&ni); 692 } else { 693 ieee80211_unref_node(&ni); 694 } 695 } 696 if (selbs == NULL) 697 goto notfound; 698 if (!ieee80211_sta_join(ic, selbs)) { 699 ieee80211_unref_node(&selbs); 700 goto notfound; 701 } 702} 703 704/* 705 * Handle 802.11 ad hoc network merge. The 706 * convention, set by the Wireless Ethernet Compatibility Alliance 707 * (WECA), is that an 802.11 station will change its BSSID to match 708 * the "oldest" 802.11 ad hoc network, on the same channel, that 709 * has the station's desired SSID. The "oldest" 802.11 network 710 * sends beacons with the greatest TSF timestamp. 711 * 712 * The caller is assumed to validate TSF's before attempting a merge. 713 * 714 * Return !0 if the BSSID changed, 0 otherwise. 715 */ 716int 717ieee80211_ibss_merge(struct ieee80211com *ic, struct ieee80211_node *ni) 718{ 719 720 if (IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) { 721 /* unchanged, nothing to do */ 722 return 0; 723 } 724 if (ieee80211_match_bss(ic, ni) != 0) { /* capabilities mismatch */ 725 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 726 "%s: merge failed, capabilities mismatch\n", __func__); 727 ic->ic_stats.is_ibss_capmismatch++; 728 return 0; 729 } 730 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 731 "%s: new bssid %s: %s preamble, %s slot time%s\n", __func__, 732 ether_sprintf(ni->ni_bssid), 733 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 734 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 735 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "" 736 ); 737 return ieee80211_sta_join(ic, ni); 738} 739 740/* 741 * Join the specified IBSS/BSS network. The node is assumed to 742 * be passed in with a held reference. 743 */ 744int 745ieee80211_sta_join(struct ieee80211com *ic, struct ieee80211_node *selbs) 746{ 747 struct ieee80211_node *obss; 748 749 if (ic->ic_opmode == IEEE80211_M_IBSS) { 750 /* 751 * Check rate set before committing to this node. 752 */ 753 ieee80211_fix_rate(ic, selbs, IEEE80211_F_DOFRATE | 754 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 755 if (selbs->ni_rates.rs_nrates == 0) { 756 selbs->ni_fails++; 757 ic->ic_stats.is_ibss_norate++; 758 return 0; 759 } 760 /* 761 * Create the neighbor table; it will already 762 * exist if we are simply switching mastership. 763 */ 764 if (ic->ic_sta == NULL) { 765 ic->ic_sta = ieee80211_node_table_alloc(ic, 766 "neighbor", ic->ic_inact_run, 767 ieee80211_timeout_stations); 768 if (ic->ic_sta == NULL) { 769 /* 770 * Should remain in SCAN state and retry. 771 */ 772 /* XXX stat+msg */ 773 return 0; 774 } 775 } 776 } 777 778 /* 779 * Committed to selbs, setup state. 780 */ 781 obss = ic->ic_bss; 782 ic->ic_bss = selbs; 783 if (obss != NULL) 784 ieee80211_free_node(obss); 785 /* 786 * Set the erp state (mostly the slot time) to deal with 787 * the auto-select case; this should be redundant if the 788 * mode is locked. 789 */ 790 ic->ic_curmode = ieee80211_chan2mode(ic, selbs->ni_chan); 791 ieee80211_reset_erp(ic); 792 ieee80211_wme_initparams(ic); 793 if (ic->ic_opmode == IEEE80211_M_IBSS) 794 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 795 else 796 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 797 return 1; 798} 799 800/* 801 * Leave the specified IBSS/BSS network. The node is assumed to 802 * be passed in with a held reference. 803 */ 804void 805ieee80211_sta_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 806{ 807 ic->ic_node_cleanup(ni); 808 ieee80211_notify_node_leave(ic, ni); 809} 810 811static struct ieee80211_node * 812node_alloc(struct ieee80211_node_table *nt) 813{ 814 struct ieee80211_node *ni; 815 816 MALLOC(ni, struct ieee80211_node *, sizeof(struct ieee80211_node), 817 M_80211_NODE, M_NOWAIT | M_ZERO); 818 return ni; 819} 820 821/* 822 * Reclaim any resources in a node and reset any critical 823 * state. Typically nodes are free'd immediately after, 824 * but in some cases the storage may be reused so we need 825 * to insure consistent state (should probably fix that). 826 */ 827static void 828node_cleanup(struct ieee80211_node *ni) 829{ 830#define N(a) (sizeof(a)/sizeof(a[0])) 831 struct ieee80211com *ic = ni->ni_ic; 832 int i, qlen; 833 834 /* NB: preserve ni_table */ 835 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) { 836 ic->ic_ps_sta--; 837 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; 838 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 839 "[%s] power save mode off, %u sta's in ps mode\n", 840 ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta); 841 } 842 843 /* 844 * Drain power save queue and, if needed, clear TIM. 845 */ 846 IEEE80211_NODE_SAVEQ_DRAIN(ni, qlen); 847 if (qlen != 0 && ic->ic_set_tim != NULL) 848 ic->ic_set_tim(ic, ni, 0); 849 850 ni->ni_associd = 0; 851 if (ni->ni_challenge != NULL) { 852 FREE(ni->ni_challenge, M_DEVBUF); 853 ni->ni_challenge = NULL; 854 } 855 /* 856 * Preserve SSID, WPA, and WME ie's so the bss node is 857 * reusable during a re-auth/re-assoc state transition. 858 * If we remove these data they will not be recreated 859 * because they come from a probe-response or beacon frame 860 * which cannot be expected prior to the association-response. 861 * This should not be an issue when operating in other modes 862 * as stations leaving always go through a full state transition 863 * which will rebuild this state. 864 * 865 * XXX does this leave us open to inheriting old state? 866 */ 867 for (i = 0; i < N(ni->ni_rxfrag); i++) 868 if (ni->ni_rxfrag[i] != NULL) { 869 m_freem(ni->ni_rxfrag[i]); 870 ni->ni_rxfrag[i] = NULL; 871 } 872 ieee80211_crypto_delkey(ic, &ni->ni_ucastkey); 873#undef N 874} 875 876static void 877node_free(struct ieee80211_node *ni) 878{ 879 struct ieee80211com *ic = ni->ni_ic; 880 881 ic->ic_node_cleanup(ni); 882 if (ni->ni_wpa_ie != NULL) 883 FREE(ni->ni_wpa_ie, M_DEVBUF); 884 if (ni->ni_wme_ie != NULL) 885 FREE(ni->ni_wme_ie, M_DEVBUF); 886 IEEE80211_NODE_SAVEQ_DESTROY(ni); 887 FREE(ni, M_80211_NODE); 888} 889 890static u_int8_t 891node_getrssi(const struct ieee80211_node *ni) 892{ 893 return ni->ni_rssi; 894} 895 896static void 897ieee80211_setup_node(struct ieee80211_node_table *nt, 898 struct ieee80211_node *ni, const u_int8_t *macaddr) 899{ 900 struct ieee80211com *ic = nt->nt_ic; 901 int hash; 902 903 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 904 "%s %s in %s table\n", __func__, 905 ether_sprintf(macaddr), nt->nt_name); 906 907 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 908 hash = IEEE80211_NODE_HASH(macaddr); 909 ieee80211_node_initref(ni); /* mark referenced */ 910 ni->ni_chan = IEEE80211_CHAN_ANYC; 911 ni->ni_authmode = IEEE80211_AUTH_OPEN; 912 ni->ni_txpower = ic->ic_txpowlimit; /* max power */ 913 ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE); 914 ni->ni_inact = ni->ni_inact_reload = nt->nt_inact_init; 915 IEEE80211_NODE_SAVEQ_INIT(ni, "unknown"); 916 917 IEEE80211_NODE_LOCK(nt); 918 TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list); 919 LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash); 920 ni->ni_table = nt; 921 ni->ni_ic = ic; 922 IEEE80211_NODE_UNLOCK(nt); 923} 924 925struct ieee80211_node * 926ieee80211_alloc_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 927{ 928 struct ieee80211com *ic = nt->nt_ic; 929 struct ieee80211_node *ni; 930 931 ni = ic->ic_node_alloc(nt); 932 if (ni != NULL) 933 ieee80211_setup_node(nt, ni, macaddr); 934 else 935 ic->ic_stats.is_rx_nodealloc++; 936 return ni; 937} 938 939struct ieee80211_node * 940ieee80211_dup_bss(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 941{ 942 struct ieee80211com *ic = nt->nt_ic; 943 struct ieee80211_node *ni; 944 945 ni = ic->ic_node_alloc(nt); 946 if (ni != NULL) { 947 ieee80211_setup_node(nt, ni, macaddr); 948 /* 949 * Inherit from ic_bss. 950 */ 951 ni->ni_authmode = ic->ic_bss->ni_authmode; 952 ni->ni_txpower = ic->ic_bss->ni_txpower; 953 ni->ni_vlan = ic->ic_bss->ni_vlan; /* XXX?? */ 954 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); 955 ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan); 956 ni->ni_rsn = ic->ic_bss->ni_rsn; 957 } else 958 ic->ic_stats.is_rx_nodealloc++; 959 return ni; 960} 961 962static struct ieee80211_node * 963#ifdef IEEE80211_DEBUG_REFCNT 964_ieee80211_find_node_debug(struct ieee80211_node_table *nt, 965 const u_int8_t *macaddr, const char *func, int line) 966#else 967_ieee80211_find_node(struct ieee80211_node_table *nt, 968 const u_int8_t *macaddr) 969#endif 970{ 971 struct ieee80211_node *ni; 972 int hash; 973 974 IEEE80211_NODE_LOCK_ASSERT(nt); 975 976 hash = IEEE80211_NODE_HASH(macaddr); 977 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 978 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) { 979 ieee80211_ref_node(ni); /* mark referenced */ 980#ifdef IEEE80211_DEBUG_REFCNT 981 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 982 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 983 ether_sprintf(ni->ni_macaddr), 984 ieee80211_node_refcnt(ni)); 985#endif 986 return ni; 987 } 988 } 989 return NULL; 990} 991#ifdef IEEE80211_DEBUG_REFCNT 992#define _ieee80211_find_node(nt, mac) \ 993 _ieee80211_find_node_debug(nt, mac, func, line) 994#endif 995 996struct ieee80211_node * 997#ifdef IEEE80211_DEBUG_REFCNT 998ieee80211_find_node_debug(struct ieee80211_node_table *nt, 999 const u_int8_t *macaddr, const char *func, int line) 1000#else 1001ieee80211_find_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 1002#endif 1003{ 1004 struct ieee80211_node *ni; 1005 1006 IEEE80211_NODE_LOCK(nt); 1007 ni = _ieee80211_find_node(nt, macaddr); 1008 IEEE80211_NODE_UNLOCK(nt); 1009 return ni; 1010} 1011 1012/* 1013 * Fake up a node; this handles node discovery in adhoc mode. 1014 * Note that for the driver's benefit we we treat this like 1015 * an association so the driver has an opportunity to setup 1016 * it's private state. 1017 */ 1018struct ieee80211_node * 1019ieee80211_fakeup_adhoc_node(struct ieee80211_node_table *nt, 1020 const u_int8_t macaddr[IEEE80211_ADDR_LEN]) 1021{ 1022 struct ieee80211com *ic = nt->nt_ic; 1023 struct ieee80211_node *ni; 1024 1025 ni = ieee80211_dup_bss(nt, macaddr); 1026 if (ni != NULL) { 1027 /* XXX no rate negotiation; just dup */ 1028 ni->ni_rates = ic->ic_bss->ni_rates; 1029 if (ic->ic_newassoc) 1030 ic->ic_newassoc(ic, ni, 1); 1031 /* XXX not right for 802.1x/WPA */ 1032 ieee80211_node_authorize(ic, ni); 1033 ieee80211_ref_node(ni); /* hold reference */ 1034 } 1035 return ni; 1036} 1037 1038/* 1039 * Locate the node for sender, track state, and then pass the 1040 * (referenced) node up to the 802.11 layer for its use. We 1041 * are required to pass some node so we fall back to ic_bss 1042 * when this frame is from an unknown sender. The 802.11 layer 1043 * knows this means the sender wasn't in the node table and 1044 * acts accordingly. 1045 */ 1046struct ieee80211_node * 1047#ifdef IEEE80211_DEBUG_REFCNT 1048ieee80211_find_rxnode_debug(struct ieee80211com *ic, 1049 const struct ieee80211_frame_min *wh, const char *func, int line) 1050#else 1051ieee80211_find_rxnode(struct ieee80211com *ic, 1052 const struct ieee80211_frame_min *wh) 1053#endif 1054{ 1055#define IS_CTL(wh) \ 1056 ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL) 1057#define IS_PSPOLL(wh) \ 1058 ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 1059 struct ieee80211_node_table *nt; 1060 struct ieee80211_node *ni; 1061 1062 /* XXX may want scanned nodes in the neighbor table for adhoc */ 1063 if (ic->ic_opmode == IEEE80211_M_STA || 1064 ic->ic_opmode == IEEE80211_M_MONITOR || 1065 (ic->ic_flags & IEEE80211_F_SCAN)) 1066 nt = &ic->ic_scan; 1067 else 1068 nt = ic->ic_sta; 1069 /* XXX check ic_bss first in station mode */ 1070 /* XXX 4-address frames? */ 1071 IEEE80211_NODE_LOCK(nt); 1072 if (IS_CTL(wh) && !IS_PSPOLL(wh) /*&& !IS_RTS(ah)*/) 1073 ni = _ieee80211_find_node(nt, wh->i_addr1); 1074 else 1075 ni = _ieee80211_find_node(nt, wh->i_addr2); 1076 IEEE80211_NODE_UNLOCK(nt); 1077 1078 return (ni != NULL ? ni : ieee80211_ref_node(ic->ic_bss)); 1079#undef IS_PSPOLL 1080#undef IS_CTL 1081} 1082 1083/* 1084 * Return a reference to the appropriate node for sending 1085 * a data frame. This handles node discovery in adhoc networks. 1086 */ 1087struct ieee80211_node * 1088#ifdef IEEE80211_DEBUG_REFCNT 1089ieee80211_find_txnode_debug(struct ieee80211com *ic, const u_int8_t *macaddr, 1090 const char *func, int line) 1091#else 1092ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr) 1093#endif 1094{ 1095 struct ieee80211_node_table *nt = ic->ic_sta; 1096 struct ieee80211_node *ni; 1097 1098 /* 1099 * The destination address should be in the node table 1100 * unless we are operating in station mode or this is a 1101 * multicast/broadcast frame. 1102 */ 1103 if (nt == NULL || IEEE80211_IS_MULTICAST(macaddr)) 1104 return ieee80211_ref_node(ic->ic_bss); 1105 1106 /* XXX can't hold lock across dup_bss 'cuz of recursive locking */ 1107 IEEE80211_NODE_LOCK(nt); 1108 ni = _ieee80211_find_node(nt, macaddr); 1109 IEEE80211_NODE_UNLOCK(nt); 1110 1111 if (ni == NULL) { 1112 if (ic->ic_opmode == IEEE80211_M_IBSS || 1113 ic->ic_opmode == IEEE80211_M_AHDEMO) 1114 ni = ieee80211_fakeup_adhoc_node(nt, macaddr); 1115 else { 1116 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 1117 "[%s] no node, discard frame (%s)\n", 1118 ether_sprintf(macaddr), __func__); 1119 ic->ic_stats.is_tx_nonode++; 1120 } 1121 } 1122 return ni; 1123} 1124 1125/* 1126 * Like find but search based on the channel too. 1127 */ 1128struct ieee80211_node * 1129#ifdef IEEE80211_DEBUG_REFCNT 1130ieee80211_find_node_with_channel_debug(struct ieee80211_node_table *nt, 1131 const u_int8_t *macaddr, struct ieee80211_channel *chan, 1132 const char *func, int line) 1133#else 1134ieee80211_find_node_with_channel(struct ieee80211_node_table *nt, 1135 const u_int8_t *macaddr, struct ieee80211_channel *chan) 1136#endif 1137{ 1138 struct ieee80211_node *ni; 1139 int hash; 1140 1141 hash = IEEE80211_NODE_HASH(macaddr); 1142 IEEE80211_NODE_LOCK(nt); 1143 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 1144 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && 1145 ni->ni_chan == chan) { 1146 ieee80211_ref_node(ni); /* mark referenced */ 1147 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1148#ifdef IEEE80211_DEBUG_REFCNT 1149 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 1150#else 1151 "%s %s refcnt %d\n", __func__, 1152#endif 1153 ether_sprintf(ni->ni_macaddr), 1154 ieee80211_node_refcnt(ni)); 1155 break; 1156 } 1157 } 1158 IEEE80211_NODE_UNLOCK(nt); 1159 return ni; 1160} 1161 1162/* 1163 * Like find but search based on the ssid too. 1164 */ 1165struct ieee80211_node * 1166#ifdef IEEE80211_DEBUG_REFCNT 1167ieee80211_find_node_with_ssid_debug(struct ieee80211_node_table *nt, 1168 const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid, 1169 const char *func, int line) 1170#else 1171ieee80211_find_node_with_ssid(struct ieee80211_node_table *nt, 1172 const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid) 1173#endif 1174{ 1175 struct ieee80211com *ic = nt->nt_ic; 1176 struct ieee80211_node *ni; 1177 int hash; 1178 1179 hash = IEEE80211_NODE_HASH(macaddr); 1180 IEEE80211_NODE_LOCK(nt); 1181 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 1182 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && 1183 ni->ni_esslen == ic->ic_des_esslen && 1184 memcmp(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen) == 0) { 1185 ieee80211_ref_node(ni); /* mark referenced */ 1186 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1187#ifdef IEEE80211_DEBUG_REFCNT 1188 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 1189#else 1190 "%s %s refcnt %d\n", __func__, 1191#endif 1192 ether_sprintf(ni->ni_macaddr), 1193 ieee80211_node_refcnt(ni)); 1194 break; 1195 } 1196 } 1197 IEEE80211_NODE_UNLOCK(nt); 1198 return ni; 1199} 1200 1201 1202static void 1203_ieee80211_free_node(struct ieee80211_node *ni) 1204{ 1205 struct ieee80211com *ic = ni->ni_ic; 1206 struct ieee80211_node_table *nt = ni->ni_table; 1207 1208 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1209 "%s %s in %s table\n", __func__, ether_sprintf(ni->ni_macaddr), 1210 nt != NULL ? nt->nt_name : "<gone>"); 1211 1212 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1213 if (nt != NULL) { 1214 TAILQ_REMOVE(&nt->nt_node, ni, ni_list); 1215 LIST_REMOVE(ni, ni_hash); 1216 } 1217 ic->ic_node_free(ni); 1218} 1219 1220void 1221#ifdef IEEE80211_DEBUG_REFCNT 1222ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line) 1223#else 1224ieee80211_free_node(struct ieee80211_node *ni) 1225#endif 1226{ 1227 struct ieee80211_node_table *nt = ni->ni_table; 1228 1229#ifdef IEEE80211_DEBUG_REFCNT 1230 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1231 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 1232 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1); 1233#endif 1234 if (ieee80211_node_dectestref(ni)) { 1235 /* 1236 * Beware; if the node is marked gone then it's already 1237 * been removed from the table and we cannot assume the 1238 * table still exists. Regardless, there's no need to lock 1239 * the table. 1240 */ 1241 if (ni->ni_table != NULL) { 1242 IEEE80211_NODE_LOCK(nt); 1243 _ieee80211_free_node(ni); 1244 IEEE80211_NODE_UNLOCK(nt); 1245 } else 1246 _ieee80211_free_node(ni); 1247 } 1248} 1249 1250/* 1251 * Reclaim a node. If this is the last reference count then 1252 * do the normal free work. Otherwise remove it from the node 1253 * table and mark it gone by clearing the back-reference. 1254 */ 1255static void 1256node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni) 1257{ 1258 1259 if (!ieee80211_node_dectestref(ni)) { 1260 /* 1261 * Other references are present, just remove the 1262 * node from the table so it cannot be found. When 1263 * the references are dropped storage will be 1264 * reclaimed. This normally only happens for ic_bss. 1265 */ 1266 TAILQ_REMOVE(&nt->nt_node, ni, ni_list); 1267 LIST_REMOVE(ni, ni_hash); 1268 ni->ni_table = NULL; /* clear reference */ 1269 } else 1270 _ieee80211_free_node(ni); 1271} 1272 1273static void 1274ieee80211_free_allnodes_locked(struct ieee80211_node_table *nt) 1275{ 1276 struct ieee80211com *ic = nt->nt_ic; 1277 struct ieee80211_node *ni; 1278 1279 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1280 "%s: free all nodes in %s table\n", __func__, nt->nt_name); 1281 1282 while ((ni = TAILQ_FIRST(&nt->nt_node)) != NULL) { 1283 if (ni->ni_associd != 0) { 1284 if (ic->ic_auth->ia_node_leave != NULL) 1285 ic->ic_auth->ia_node_leave(ic, ni); 1286 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1287 } 1288 node_reclaim(nt, ni); 1289 } 1290 ieee80211_reset_erp(ic); 1291} 1292 1293static void 1294ieee80211_free_allnodes(struct ieee80211_node_table *nt) 1295{ 1296 1297 IEEE80211_NODE_LOCK(nt); 1298 ieee80211_free_allnodes_locked(nt); 1299 IEEE80211_NODE_UNLOCK(nt); 1300} 1301 1302/* 1303 * Timeout entries in the scan cache. 1304 */ 1305static void 1306ieee80211_timeout_scan_candidates(struct ieee80211_node_table *nt) 1307{ 1308 struct ieee80211com *ic = nt->nt_ic; 1309 struct ieee80211_node *ni, *tni; 1310 1311 IEEE80211_NODE_LOCK(nt); 1312 ni = ic->ic_bss; 1313 /* XXX belongs elsewhere */ 1314 if (ni->ni_rxfrag[0] != NULL && ticks > ni->ni_rxfragstamp + hz) { 1315 m_freem(ni->ni_rxfrag[0]); 1316 ni->ni_rxfrag[0] = NULL; 1317 } 1318 TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, tni) { 1319 if (ni->ni_inact && --ni->ni_inact == 0) { 1320 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1321 "[%s] scan candidate purged from cache " 1322 "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr), 1323 ieee80211_node_refcnt(ni)-1); 1324 node_reclaim(nt, ni); 1325 } 1326 } 1327 IEEE80211_NODE_UNLOCK(nt); 1328 1329 nt->nt_inact_timer = IEEE80211_INACT_WAIT; 1330} 1331 1332/* 1333 * Timeout inactive stations and do related housekeeping. 1334 * Note that we cannot hold the node lock while sending a 1335 * frame as this would lead to a LOR. Instead we use a 1336 * generation number to mark nodes that we've scanned and 1337 * drop the lock and restart a scan if we have to time out 1338 * a node. Since we are single-threaded by virtue of 1339 * controlling the inactivity timer we can be sure this will 1340 * process each node only once. 1341 */ 1342static void 1343ieee80211_timeout_stations(struct ieee80211_node_table *nt) 1344{ 1345 struct ieee80211com *ic = nt->nt_ic; 1346 struct ieee80211_node *ni; 1347 u_int gen; 1348 1349 IEEE80211_SCAN_LOCK(nt); 1350 gen = nt->nt_scangen++; 1351 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1352 "%s: sta scangen %u\n", __func__, gen); 1353restart: 1354 IEEE80211_NODE_LOCK(nt); 1355 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1356 if (ni->ni_scangen == gen) /* previously handled */ 1357 continue; 1358 ni->ni_scangen = gen; 1359 /* 1360 * Free fragment if not needed anymore 1361 * (last fragment older than 1s). 1362 * XXX doesn't belong here 1363 */ 1364 if (ni->ni_rxfrag[0] != NULL && 1365 ticks > ni->ni_rxfragstamp + hz) { 1366 m_freem(ni->ni_rxfrag[0]); 1367 ni->ni_rxfrag[0] = NULL; 1368 } 1369 ni->ni_inact--; 1370 if (ni->ni_associd != 0) { 1371 /* 1372 * Age frames on the power save queue. The 1373 * aging interval is 4 times the listen 1374 * interval specified by the station. This 1375 * number is factored into the age calculations 1376 * when the frame is placed on the queue. We 1377 * store ages as time differences we can check 1378 * and/or adjust only the head of the list. 1379 */ 1380 if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) { 1381 struct mbuf *m; 1382 int discard = 0; 1383 1384 IEEE80211_NODE_SAVEQ_LOCK(ni); 1385 while (IF_POLL(&ni->ni_savedq, m) != NULL && 1386 M_AGE_GET(m) < IEEE80211_INACT_WAIT) { 1387IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] discard frame, age %u\n", ether_sprintf(ni->ni_macaddr), M_AGE_GET(m));/*XXX*/ 1388 _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m); 1389 m_freem(m); 1390 discard++; 1391 } 1392 if (m != NULL) 1393 M_AGE_SUB(m, IEEE80211_INACT_WAIT); 1394 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1395 1396 if (discard != 0) { 1397 IEEE80211_DPRINTF(ic, 1398 IEEE80211_MSG_POWER, 1399 "[%s] discard %u frames for age\n", 1400 ether_sprintf(ni->ni_macaddr), 1401 discard); 1402 IEEE80211_NODE_STAT_ADD(ni, 1403 ps_discard, discard); 1404 if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) 1405 ic->ic_set_tim(ic, ni, 0); 1406 } 1407 } 1408 /* 1409 * Probe the station before time it out. We 1410 * send a null data frame which may not be 1411 * universally supported by drivers (need it 1412 * for ps-poll support so it should be...). 1413 */ 1414 if (ni->ni_inact == ic->ic_inact_probe) { 1415 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1416 "[%s] probe station due to inactivity\n", 1417 ether_sprintf(ni->ni_macaddr)); 1418 IEEE80211_NODE_UNLOCK(nt); 1419 ieee80211_send_nulldata(ic, ni); 1420 /* XXX stat? */ 1421 goto restart; 1422 } 1423 } 1424 if (ni->ni_inact <= 0) { 1425 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1426 "[%s] station timed out due to inactivity " 1427 "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr), 1428 ieee80211_node_refcnt(ni)); 1429 /* 1430 * Send a deauthenticate frame and drop the station. 1431 * This is somewhat complicated due to reference counts 1432 * and locking. At this point a station will typically 1433 * have a reference count of 1. ieee80211_node_leave 1434 * will do a "free" of the node which will drop the 1435 * reference count. But in the meantime a reference 1436 * wil be held by the deauth frame. The actual reclaim 1437 * of the node will happen either after the tx is 1438 * completed or by ieee80211_node_leave. 1439 * 1440 * Separately we must drop the node lock before sending 1441 * in case the driver takes a lock, as this will result 1442 * in LOR between the node lock and the driver lock. 1443 */ 1444 IEEE80211_NODE_UNLOCK(nt); 1445 if (ni->ni_associd != 0) { 1446 IEEE80211_SEND_MGMT(ic, ni, 1447 IEEE80211_FC0_SUBTYPE_DEAUTH, 1448 IEEE80211_REASON_AUTH_EXPIRE); 1449 } 1450 ieee80211_node_leave(ic, ni); 1451 ic->ic_stats.is_node_timeout++; 1452 goto restart; 1453 } 1454 } 1455 IEEE80211_NODE_UNLOCK(nt); 1456 1457 IEEE80211_SCAN_UNLOCK(nt); 1458 1459 nt->nt_inact_timer = IEEE80211_INACT_WAIT; 1460} 1461 1462void 1463ieee80211_iterate_nodes(struct ieee80211_node_table *nt, ieee80211_iter_func *f, void *arg) 1464{ 1465 struct ieee80211_node *ni; 1466 u_int gen; 1467 1468 IEEE80211_SCAN_LOCK(nt); 1469 gen = nt->nt_scangen++; 1470 1471 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1472 "%s: sta scangen %u\n", __func__, gen); 1473restart: 1474 IEEE80211_NODE_LOCK(nt); 1475 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1476 if (ni->ni_scangen != gen) { 1477 ni->ni_scangen = gen; 1478 (void) ieee80211_ref_node(ni); 1479 IEEE80211_NODE_UNLOCK(nt); 1480 (*f)(arg, ni); 1481 ieee80211_free_node(ni); 1482 goto restart; 1483 } 1484 } 1485 IEEE80211_NODE_UNLOCK(nt); 1486 1487 IEEE80211_SCAN_UNLOCK(nt); 1488} 1489 1490void 1491ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni) 1492{ 1493 printf("0x%p: mac %s refcnt %d\n", ni, 1494 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); 1495 printf("\tscangen %u authmode %u flags 0x%x\n", 1496 ni->ni_scangen, ni->ni_authmode, ni->ni_flags); 1497 printf("\tassocid 0x%x txpower %u vlan %u\n", 1498 ni->ni_associd, ni->ni_txpower, ni->ni_vlan); 1499 printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n", 1500 ni->ni_txseqs[0], 1501 ni->ni_rxseqs[0] >> IEEE80211_SEQ_SEQ_SHIFT, 1502 ni->ni_rxseqs[0] & IEEE80211_SEQ_FRAG_MASK, 1503 ni->ni_rxfragstamp); 1504 printf("\trstamp %u rssi %u intval %u capinfo 0x%x\n", 1505 ni->ni_rstamp, ni->ni_rssi, ni->ni_intval, ni->ni_capinfo); 1506 printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n", 1507 ether_sprintf(ni->ni_bssid), 1508 ni->ni_esslen, ni->ni_essid, 1509 ni->ni_chan->ic_freq, ni->ni_chan->ic_flags); 1510 printf("\tfails %u inact %u txrate %u\n", 1511 ni->ni_fails, ni->ni_inact, ni->ni_txrate); 1512} 1513 1514void 1515ieee80211_dump_nodes(struct ieee80211_node_table *nt) 1516{ 1517 ieee80211_iterate_nodes(nt, 1518 (ieee80211_iter_func *) ieee80211_dump_node, nt); 1519} 1520 1521/* 1522 * Handle a station joining an 11g network. 1523 */ 1524static void 1525ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1526{ 1527 1528 /* 1529 * Station isn't capable of short slot time. Bump 1530 * the count of long slot time stations and disable 1531 * use of short slot time. Note that the actual switch 1532 * over to long slot time use may not occur until the 1533 * next beacon transmission (per sec. 7.3.1.4 of 11g). 1534 */ 1535 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { 1536 ic->ic_longslotsta++; 1537 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1538 "[%s] station needs long slot time, count %d\n", 1539 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); 1540 /* XXX vap's w/ conflicting needs won't work */ 1541 ieee80211_set_shortslottime(ic, 0); 1542 } 1543 /* 1544 * If the new station is not an ERP station 1545 * then bump the counter and enable protection 1546 * if configured. 1547 */ 1548 if (!ieee80211_iserp_rateset(ic, &ni->ni_rates)) { 1549 ic->ic_nonerpsta++; 1550 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1551 "[%s] station is !ERP, %d non-ERP stations associated\n", 1552 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); 1553 /* 1554 * If protection is configured, enable it. 1555 */ 1556 if (ic->ic_protmode != IEEE80211_PROT_NONE) { 1557 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1558 "%s: enable use of protection\n", __func__); 1559 ic->ic_flags |= IEEE80211_F_USEPROT; 1560 } 1561 /* 1562 * If station does not support short preamble 1563 * then we must enable use of Barker preamble. 1564 */ 1565 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) { 1566 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1567 "[%s] station needs long preamble\n", 1568 ether_sprintf(ni->ni_macaddr)); 1569 ic->ic_flags |= IEEE80211_F_USEBARKER; 1570 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1571 } 1572 } else 1573 ni->ni_flags |= IEEE80211_NODE_ERP; 1574} 1575 1576void 1577ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int resp) 1578{ 1579 int newassoc; 1580 1581 if (ni->ni_associd == 0) { 1582 u_int16_t aid; 1583 1584 /* 1585 * It would be good to search the bitmap 1586 * more efficiently, but this will do for now. 1587 */ 1588 for (aid = 1; aid < ic->ic_max_aid; aid++) { 1589 if (!IEEE80211_AID_ISSET(aid, 1590 ic->ic_aid_bitmap)) 1591 break; 1592 } 1593 if (aid >= ic->ic_max_aid) { 1594 IEEE80211_SEND_MGMT(ic, ni, resp, 1595 IEEE80211_REASON_ASSOC_TOOMANY); 1596 ieee80211_node_leave(ic, ni); 1597 return; 1598 } 1599 ni->ni_associd = aid | 0xc000; 1600 IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap); 1601 ic->ic_sta_assoc++; 1602 newassoc = 1; 1603 if (ic->ic_curmode == IEEE80211_MODE_11G) 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 %s associated at aid %d\n", 1610 ether_sprintf(ni->ni_macaddr), newassoc ? "newly" : "already", 1611 IEEE80211_NODE_AID(ni)); 1612 1613 /* give driver a chance to setup state like ni_txrate */ 1614 if (ic->ic_newassoc) 1615 ic->ic_newassoc(ic, ni, newassoc); 1616 ni->ni_inact_reload = ic->ic_inact_run; 1617 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS); 1618 /* tell the authenticator about new station */ 1619 if (ic->ic_auth->ia_node_join != NULL) 1620 ic->ic_auth->ia_node_join(ic, ni); 1621 ieee80211_notify_node_join(ic, ni, newassoc); 1622} 1623 1624/* 1625 * Handle a station leaving an 11g network. 1626 */ 1627static void 1628ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1629{ 1630 1631 KASSERT(ic->ic_curmode == IEEE80211_MODE_11G, 1632 ("not in 11g, curmode %x", ic->ic_curmode)); 1633 1634 /* 1635 * If a long slot station do the slot time bookkeeping. 1636 */ 1637 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { 1638 KASSERT(ic->ic_longslotsta > 0, 1639 ("bogus long slot station count %d", ic->ic_longslotsta)); 1640 ic->ic_longslotsta--; 1641 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1642 "[%s] long slot time station leaves, count now %d\n", 1643 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); 1644 if (ic->ic_longslotsta == 0) { 1645 /* 1646 * Re-enable use of short slot time if supported 1647 * and not operating in IBSS mode (per spec). 1648 */ 1649 if ((ic->ic_caps & IEEE80211_C_SHSLOT) && 1650 ic->ic_opmode != IEEE80211_M_IBSS) { 1651 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1652 "%s: re-enable use of short slot time\n", 1653 __func__); 1654 ieee80211_set_shortslottime(ic, 1); 1655 } 1656 } 1657 } 1658 /* 1659 * If a non-ERP station do the protection-related bookkeeping. 1660 */ 1661 if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) { 1662 KASSERT(ic->ic_nonerpsta > 0, 1663 ("bogus non-ERP station count %d", ic->ic_nonerpsta)); 1664 ic->ic_nonerpsta--; 1665 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1666 "[%s] non-ERP station leaves, count now %d\n", 1667 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); 1668 if (ic->ic_nonerpsta == 0) { 1669 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1670 "%s: disable use of protection\n", __func__); 1671 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1672 /* XXX verify mode? */ 1673 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) { 1674 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1675 "%s: re-enable use of short preamble\n", 1676 __func__); 1677 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1678 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1679 } 1680 } 1681 } 1682} 1683 1684/* 1685 * Handle bookkeeping for station deauthentication/disassociation 1686 * when operating as an ap. 1687 */ 1688void 1689ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 1690{ 1691 1692 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, 1693 "[%s] station with aid %d leaves\n", 1694 ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_AID(ni)); 1695 1696 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || 1697 ic->ic_opmode == IEEE80211_M_IBSS || 1698 ic->ic_opmode == IEEE80211_M_AHDEMO, 1699 ("unexpected operating mode %u", ic->ic_opmode)); 1700 /* 1701 * If node wasn't previously associated all 1702 * we need to do is reclaim the reference. 1703 */ 1704 /* XXX ibss mode bypasses 11g and notification */ 1705 if (ni->ni_associd == 0) 1706 goto done; 1707 /* 1708 * Tell the authenticator the station is leaving. 1709 * Note that we must do this before yanking the 1710 * association id as the authenticator uses the 1711 * associd to locate it's state block. 1712 */ 1713 if (ic->ic_auth->ia_node_leave != NULL) 1714 ic->ic_auth->ia_node_leave(ic, ni); 1715 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1716 ni->ni_associd = 0; 1717 ic->ic_sta_assoc--; 1718 1719 if (ic->ic_curmode == IEEE80211_MODE_11G) 1720 ieee80211_node_leave_11g(ic, ni); 1721 /* 1722 * Cleanup station state. In particular clear various 1723 * state that might otherwise be reused if the node 1724 * is reused before the reference count goes to zero 1725 * (and memory is reclaimed). 1726 */ 1727 ieee80211_sta_leave(ic, ni); 1728done: 1729 ni->ni_inact_reload = ic->ic_inact_init; /* just in case */ 1730 ieee80211_free_node(ni); 1731} 1732 1733u_int8_t 1734ieee80211_getrssi(struct ieee80211com *ic) 1735{ 1736#define NZ(x) ((x) == 0 ? 1 : (x)) 1737 struct ieee80211_node_table *nt = ic->ic_sta; 1738 u_int32_t rssi_samples, rssi_total; 1739 struct ieee80211_node *ni; 1740 1741 rssi_total = 0; 1742 rssi_samples = 0; 1743 switch (ic->ic_opmode) { 1744 case IEEE80211_M_IBSS: /* average of all ibss neighbors */ 1745 nt = ic->ic_sta; 1746 if (nt == NULL) 1747 break; 1748 /* XXX locking */ 1749 TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list) 1750 if (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) { 1751 rssi_samples++; 1752 rssi_total += ic->ic_node_getrssi(ni); 1753 } 1754 break; 1755 case IEEE80211_M_AHDEMO: /* average of all neighbors */ 1756 nt = ic->ic_sta; 1757 if (nt == NULL) 1758 break; 1759 /* XXX locking */ 1760 TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list) { 1761 rssi_samples++; 1762 rssi_total += ic->ic_node_getrssi(ni); 1763 } 1764 break; 1765 case IEEE80211_M_HOSTAP: /* average of all associated stations */ 1766 nt = ic->ic_sta; 1767 if (nt == NULL) 1768 break; 1769 /* XXX locking */ 1770 TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list) 1771 if (IEEE80211_AID(ni->ni_associd) != 0) { 1772 rssi_samples++; 1773 rssi_total += ic->ic_node_getrssi(ni); 1774 } 1775 break; 1776 case IEEE80211_M_MONITOR: /* XXX */ 1777 case IEEE80211_M_STA: /* use stats from associated ap */ 1778 default: 1779 if (ic->ic_bss != NULL) 1780 rssi_total = ic->ic_node_getrssi(ic->ic_bss); 1781 rssi_samples = 1; 1782 break; 1783 } 1784 return rssi_total / NZ(rssi_samples); 1785#undef NZ 1786} 1787 1788/* 1789 * Indicate whether there are frames queued for a station in power-save mode. 1790 */ 1791static void 1792ieee80211_set_tim(struct ieee80211com *ic, struct ieee80211_node *ni, int set) 1793{ 1794 u_int16_t aid; 1795 1796 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || 1797 ic->ic_opmode == IEEE80211_M_IBSS, 1798 ("operating mode %u", ic->ic_opmode)); 1799 1800 aid = IEEE80211_AID(ni->ni_associd); 1801 KASSERT(aid < ic->ic_max_aid, 1802 ("bogus aid %u, max %u", aid, ic->ic_max_aid)); 1803 1804 IEEE80211_BEACON_LOCK(ic); 1805 if (set != (isset(ic->ic_tim_bitmap, aid) != 0)) { 1806 if (set) { 1807 setbit(ic->ic_tim_bitmap, aid); 1808 ic->ic_ps_pending++; 1809 } else { 1810 clrbit(ic->ic_tim_bitmap, aid); 1811 ic->ic_ps_pending--; 1812 } 1813 ic->ic_flags |= IEEE80211_F_TIMUPDATE; 1814 } 1815 IEEE80211_BEACON_UNLOCK(ic); 1816} 1817 1818/* 1819 * Node table support. 1820 */ 1821 1822static void 1823ieee80211_node_table_init(struct ieee80211com *ic, 1824 struct ieee80211_node_table *nt, 1825 const char *name, int inact, 1826 void (*timeout)(struct ieee80211_node_table *)) 1827{ 1828 1829 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1830 "%s %s table, inact %u\n", __func__, name, inact); 1831 1832 nt->nt_ic = ic; 1833 /* XXX need unit */ 1834 IEEE80211_NODE_LOCK_INIT(nt, ic->ic_ifp->if_xname); 1835 IEEE80211_SCAN_LOCK_INIT(nt, ic->ic_ifp->if_xname); 1836 TAILQ_INIT(&nt->nt_node); 1837 nt->nt_name = name; 1838 nt->nt_scangen = 1; 1839 nt->nt_inact_init = inact; 1840 nt->nt_timeout = timeout; 1841} 1842 1843static struct ieee80211_node_table * 1844ieee80211_node_table_alloc(struct ieee80211com *ic, 1845 const char *name, int inact, 1846 void (*timeout)(struct ieee80211_node_table *)) 1847{ 1848 struct ieee80211_node_table *nt; 1849 1850 MALLOC(nt, struct ieee80211_node_table *, 1851 sizeof(struct ieee80211_node_table), 1852 M_DEVBUF, M_NOWAIT | M_ZERO); 1853 if (nt == NULL) { 1854 printf("%s: no memory node table!\n", __func__); 1855 return NULL; 1856 } 1857 ieee80211_node_table_init(ic, nt, name, inact, timeout); 1858 return nt; 1859} 1860 1861void 1862ieee80211_node_table_reset(struct ieee80211_node_table *nt) 1863{ 1864 1865 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1866 "%s %s table\n", __func__, nt->nt_name); 1867 1868 IEEE80211_NODE_LOCK(nt); 1869 nt->nt_inact_timer = 0; 1870 ieee80211_free_allnodes_locked(nt); 1871 IEEE80211_NODE_UNLOCK(nt); 1872} 1873 1874static void 1875ieee80211_node_table_cleanup(struct ieee80211_node_table *nt) 1876{ 1877 1878 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1879 "%s %s table\n", __func__, nt->nt_name); 1880 1881 ieee80211_free_allnodes_locked(nt); 1882 IEEE80211_SCAN_LOCK_DESTROY(nt); 1883 IEEE80211_NODE_LOCK_DESTROY(nt); 1884} 1885 1886/* 1887 * NB: public for use in ieee80211_proto.c 1888 */ 1889void 1890ieee80211_node_table_free(struct ieee80211_node_table *nt) 1891{ 1892 1893 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1894 "%s %s table\n", __func__, nt->nt_name); 1895 1896 IEEE80211_NODE_LOCK(nt); 1897 nt->nt_inact_timer = 0; 1898 ieee80211_node_table_cleanup(nt); 1899 FREE(nt, M_DEVBUF); 1900} 1901