ieee80211_node.c revision 140441
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 140441 2005-01-18 19:59:40Z 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 * Mark an ongoing scan stopped. 574 */ 575void 576ieee80211_cancel_scan(struct ieee80211com *ic) 577{ 578 579 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s: end %s scan\n", 580 __func__, 581 (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive"); 582 583 ic->ic_flags &= ~(IEEE80211_F_SCAN | IEEE80211_F_ASCAN); 584} 585 586/* 587 * Complete a scan of potential channels. 588 */ 589void 590ieee80211_end_scan(struct ieee80211com *ic) 591{ 592 struct ieee80211_node *ni, *nextbs, *selbs; 593 struct ieee80211_node_table *nt; 594 595 ieee80211_cancel_scan(ic); 596 ieee80211_notify_scan_done(ic); 597 598 nt = &ic->ic_scan; 599 ni = TAILQ_FIRST(&nt->nt_node); 600 601 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 602 u_int8_t maxrssi[IEEE80211_CHAN_MAX]; /* XXX off stack? */ 603 int i, bestchan; 604 u_int8_t rssi; 605 606 /* 607 * The passive scan to look for existing AP's completed, 608 * select a channel to camp on. Identify the channels 609 * that already have one or more AP's and try to locate 610 * an unnoccupied one. If that fails, pick a channel that 611 * looks to be quietest. 612 */ 613 memset(maxrssi, 0, sizeof(maxrssi)); 614 for (; ni != NULL; ni = nextbs) { 615 ieee80211_ref_node(ni); 616 nextbs = TAILQ_NEXT(ni, ni_list); 617 rssi = ic->ic_node_getrssi(ni); 618 i = ieee80211_chan2ieee(ic, ni->ni_chan); 619 if (rssi > maxrssi[i]) 620 maxrssi[i] = rssi; 621 ieee80211_unref_node(&ni); 622 } 623 /* XXX select channel more intelligently */ 624 bestchan = -1; 625 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 626 if (isset(ic->ic_chan_active, i)) { 627 /* 628 * If the channel is unoccupied the max rssi 629 * should be zero; just take it. Otherwise 630 * track the channel with the lowest rssi and 631 * use that when all channels appear occupied. 632 */ 633 if (maxrssi[i] == 0) { 634 bestchan = i; 635 break; 636 } 637 if (maxrssi[i] < maxrssi[bestchan]) 638 bestchan = i; 639 } 640 if (bestchan != -1) { 641 ieee80211_create_ibss(ic, &ic->ic_channels[bestchan]); 642 return; 643 } 644 /* no suitable channel, should not happen */ 645 } 646 647 /* 648 * When manually sequencing the state machine; scan just once 649 * regardless of whether we have a candidate or not. The 650 * controlling application is expected to setup state and 651 * initiate an association. 652 */ 653 if (ic->ic_roaming == IEEE80211_ROAMING_MANUAL) 654 return; 655 /* 656 * Automatic sequencing; look for a candidate and 657 * if found join the network. 658 */ 659 if (ni == NULL) { 660 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 661 "%s: no scan candidate\n", __func__); 662 notfound: 663 if (ic->ic_opmode == IEEE80211_M_IBSS && 664 (ic->ic_flags & IEEE80211_F_IBSSON) && 665 ic->ic_des_esslen != 0) { 666 ieee80211_create_ibss(ic, ic->ic_ibss_chan); 667 return; 668 } 669 /* 670 * Reset the list of channels to scan and start again. 671 */ 672 ieee80211_reset_scan(ic); 673 ic->ic_flags |= IEEE80211_F_SCAN; 674 ieee80211_next_scan(ic); 675 return; 676 } 677 selbs = NULL; 678 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "\t%s\n", 679 "macaddr bssid chan rssi rate flag wep essid"); 680 for (; ni != NULL; ni = nextbs) { 681 ieee80211_ref_node(ni); 682 nextbs = TAILQ_NEXT(ni, ni_list); 683 if (ni->ni_fails) { 684 /* 685 * The configuration of the access points may change 686 * during my scan. So delete the entry for the AP 687 * and retry to associate if there is another beacon. 688 */ 689 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 690 "%s: skip scan candidate %s, fails %u\n", 691 __func__, ether_sprintf(ni->ni_macaddr), 692 ni->ni_fails); 693 if (ni->ni_fails++ > 2) 694 ieee80211_free_node(ni); 695 continue; 696 } 697 if (ieee80211_match_bss(ic, ni) == 0) { 698 if (selbs == NULL) 699 selbs = ni; 700 else if (ieee80211_node_compare(ic, ni, selbs) > 0) { 701 ieee80211_unref_node(&selbs); 702 selbs = ni; 703 } else 704 ieee80211_unref_node(&ni); 705 } else { 706 ieee80211_unref_node(&ni); 707 } 708 } 709 if (selbs == NULL) 710 goto notfound; 711 if (!ieee80211_sta_join(ic, selbs)) { 712 ieee80211_unref_node(&selbs); 713 goto notfound; 714 } 715} 716 717/* 718 * Handle 802.11 ad hoc network merge. The 719 * convention, set by the Wireless Ethernet Compatibility Alliance 720 * (WECA), is that an 802.11 station will change its BSSID to match 721 * the "oldest" 802.11 ad hoc network, on the same channel, that 722 * has the station's desired SSID. The "oldest" 802.11 network 723 * sends beacons with the greatest TSF timestamp. 724 * 725 * The caller is assumed to validate TSF's before attempting a merge. 726 * 727 * Return !0 if the BSSID changed, 0 otherwise. 728 */ 729int 730ieee80211_ibss_merge(struct ieee80211com *ic, struct ieee80211_node *ni) 731{ 732 733 if (IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) { 734 /* unchanged, nothing to do */ 735 return 0; 736 } 737 if (ieee80211_match_bss(ic, ni) != 0) { /* capabilities mismatch */ 738 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 739 "%s: merge failed, capabilities mismatch\n", __func__); 740 ic->ic_stats.is_ibss_capmismatch++; 741 return 0; 742 } 743 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 744 "%s: new bssid %s: %s preamble, %s slot time%s\n", __func__, 745 ether_sprintf(ni->ni_bssid), 746 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 747 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 748 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "" 749 ); 750 return ieee80211_sta_join(ic, ni); 751} 752 753/* 754 * Join the specified IBSS/BSS network. The node is assumed to 755 * be passed in with a held reference. 756 */ 757int 758ieee80211_sta_join(struct ieee80211com *ic, struct ieee80211_node *selbs) 759{ 760 struct ieee80211_node *obss; 761 762 if (ic->ic_opmode == IEEE80211_M_IBSS) { 763 /* 764 * Delete unusable rates; we've already checked 765 * that the negotiated rate set is acceptable. 766 */ 767 ieee80211_fix_rate(ic, selbs, IEEE80211_F_DODEL); 768 /* 769 * Create the neighbor table; it will already 770 * exist if we are simply switching mastership. 771 */ 772 if (ic->ic_sta == NULL) { 773 ic->ic_sta = ieee80211_node_table_alloc(ic, 774 "neighbor", ic->ic_inact_run, 775 ieee80211_timeout_stations); 776 if (ic->ic_sta == NULL) { 777 /* 778 * Should remain in SCAN state and retry. 779 */ 780 /* XXX stat+msg */ 781 return 0; 782 } 783 } 784 } 785 786 /* 787 * Committed to selbs, setup state. 788 */ 789 obss = ic->ic_bss; 790 ic->ic_bss = selbs; 791 if (obss != NULL) 792 ieee80211_free_node(obss); 793 /* 794 * Set the erp state (mostly the slot time) to deal with 795 * the auto-select case; this should be redundant if the 796 * mode is locked. 797 */ 798 ic->ic_curmode = ieee80211_chan2mode(ic, selbs->ni_chan); 799 ieee80211_reset_erp(ic); 800 ieee80211_wme_initparams(ic); 801 if (ic->ic_opmode == IEEE80211_M_IBSS) 802 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 803 else 804 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 805 return 1; 806} 807 808/* 809 * Leave the specified IBSS/BSS network. The node is assumed to 810 * be passed in with a held reference. 811 */ 812void 813ieee80211_sta_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 814{ 815 ic->ic_node_cleanup(ni); 816 ieee80211_notify_node_leave(ic, ni); 817} 818 819static struct ieee80211_node * 820node_alloc(struct ieee80211_node_table *nt) 821{ 822 struct ieee80211_node *ni; 823 824 MALLOC(ni, struct ieee80211_node *, sizeof(struct ieee80211_node), 825 M_80211_NODE, M_NOWAIT | M_ZERO); 826 return ni; 827} 828 829/* 830 * Reclaim any resources in a node and reset any critical 831 * state. Typically nodes are free'd immediately after, 832 * but in some cases the storage may be reused so we need 833 * to insure consistent state (should probably fix that). 834 */ 835static void 836node_cleanup(struct ieee80211_node *ni) 837{ 838#define N(a) (sizeof(a)/sizeof(a[0])) 839 struct ieee80211com *ic = ni->ni_ic; 840 int i, qlen; 841 842 /* NB: preserve ni_table */ 843 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) { 844 ic->ic_ps_sta--; 845 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; 846 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 847 "[%s] power save mode off, %u sta's in ps mode\n", 848 ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta); 849 } 850 851 /* 852 * Drain power save queue and, if needed, clear TIM. 853 */ 854 IEEE80211_NODE_SAVEQ_DRAIN(ni, qlen); 855 if (qlen != 0 && ic->ic_set_tim != NULL) 856 ic->ic_set_tim(ic, ni, 0); 857 858 ni->ni_associd = 0; 859 if (ni->ni_challenge != NULL) { 860 FREE(ni->ni_challenge, M_DEVBUF); 861 ni->ni_challenge = NULL; 862 } 863 /* 864 * Preserve SSID, WPA, and WME ie's so the bss node is 865 * reusable during a re-auth/re-assoc state transition. 866 * If we remove these data they will not be recreated 867 * because they come from a probe-response or beacon frame 868 * which cannot be expected prior to the association-response. 869 * This should not be an issue when operating in other modes 870 * as stations leaving always go through a full state transition 871 * which will rebuild this state. 872 * 873 * XXX does this leave us open to inheriting old state? 874 */ 875 for (i = 0; i < N(ni->ni_rxfrag); i++) 876 if (ni->ni_rxfrag[i] != NULL) { 877 m_freem(ni->ni_rxfrag[i]); 878 ni->ni_rxfrag[i] = NULL; 879 } 880 ieee80211_crypto_delkey(ic, &ni->ni_ucastkey); 881#undef N 882} 883 884static void 885node_free(struct ieee80211_node *ni) 886{ 887 struct ieee80211com *ic = ni->ni_ic; 888 889 ic->ic_node_cleanup(ni); 890 if (ni->ni_wpa_ie != NULL) 891 FREE(ni->ni_wpa_ie, M_DEVBUF); 892 if (ni->ni_wme_ie != NULL) 893 FREE(ni->ni_wme_ie, M_DEVBUF); 894 IEEE80211_NODE_SAVEQ_DESTROY(ni); 895 FREE(ni, M_80211_NODE); 896} 897 898static u_int8_t 899node_getrssi(const struct ieee80211_node *ni) 900{ 901 return ni->ni_rssi; 902} 903 904static void 905ieee80211_setup_node(struct ieee80211_node_table *nt, 906 struct ieee80211_node *ni, const u_int8_t *macaddr) 907{ 908 struct ieee80211com *ic = nt->nt_ic; 909 int hash; 910 911 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 912 "%s %s in %s table\n", __func__, 913 ether_sprintf(macaddr), nt->nt_name); 914 915 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 916 hash = IEEE80211_NODE_HASH(macaddr); 917 ieee80211_node_initref(ni); /* mark referenced */ 918 ni->ni_chan = IEEE80211_CHAN_ANYC; 919 ni->ni_authmode = IEEE80211_AUTH_OPEN; 920 ni->ni_txpower = ic->ic_txpowlimit; /* max power */ 921 ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE); 922 ni->ni_inact_reload = nt->nt_inact_init; 923 ni->ni_inact = ni->ni_inact_reload; 924 IEEE80211_NODE_SAVEQ_INIT(ni, "unknown"); 925 926 IEEE80211_NODE_LOCK(nt); 927 TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list); 928 LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash); 929 ni->ni_table = nt; 930 ni->ni_ic = ic; 931 IEEE80211_NODE_UNLOCK(nt); 932} 933 934struct ieee80211_node * 935ieee80211_alloc_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 936{ 937 struct ieee80211com *ic = nt->nt_ic; 938 struct ieee80211_node *ni; 939 940 ni = ic->ic_node_alloc(nt); 941 if (ni != NULL) 942 ieee80211_setup_node(nt, ni, macaddr); 943 else 944 ic->ic_stats.is_rx_nodealloc++; 945 return ni; 946} 947 948struct ieee80211_node * 949ieee80211_dup_bss(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 950{ 951 struct ieee80211com *ic = nt->nt_ic; 952 struct ieee80211_node *ni; 953 954 ni = ic->ic_node_alloc(nt); 955 if (ni != NULL) { 956 ieee80211_setup_node(nt, ni, macaddr); 957 /* 958 * Inherit from ic_bss. 959 */ 960 ni->ni_authmode = ic->ic_bss->ni_authmode; 961 ni->ni_txpower = ic->ic_bss->ni_txpower; 962 ni->ni_vlan = ic->ic_bss->ni_vlan; /* XXX?? */ 963 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); 964 ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan); 965 ni->ni_rsn = ic->ic_bss->ni_rsn; 966 } else 967 ic->ic_stats.is_rx_nodealloc++; 968 return ni; 969} 970 971static struct ieee80211_node * 972#ifdef IEEE80211_DEBUG_REFCNT 973_ieee80211_find_node_debug(struct ieee80211_node_table *nt, 974 const u_int8_t *macaddr, const char *func, int line) 975#else 976_ieee80211_find_node(struct ieee80211_node_table *nt, 977 const u_int8_t *macaddr) 978#endif 979{ 980 struct ieee80211_node *ni; 981 int hash; 982 983 IEEE80211_NODE_LOCK_ASSERT(nt); 984 985 hash = IEEE80211_NODE_HASH(macaddr); 986 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 987 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) { 988 ieee80211_ref_node(ni); /* mark referenced */ 989#ifdef IEEE80211_DEBUG_REFCNT 990 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 991 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 992 ether_sprintf(ni->ni_macaddr), 993 ieee80211_node_refcnt(ni)); 994#endif 995 return ni; 996 } 997 } 998 return NULL; 999} 1000#ifdef IEEE80211_DEBUG_REFCNT 1001#define _ieee80211_find_node(nt, mac) \ 1002 _ieee80211_find_node_debug(nt, mac, func, line) 1003#endif 1004 1005struct ieee80211_node * 1006#ifdef IEEE80211_DEBUG_REFCNT 1007ieee80211_find_node_debug(struct ieee80211_node_table *nt, 1008 const u_int8_t *macaddr, const char *func, int line) 1009#else 1010ieee80211_find_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 1011#endif 1012{ 1013 struct ieee80211_node *ni; 1014 1015 IEEE80211_NODE_LOCK(nt); 1016 ni = _ieee80211_find_node(nt, macaddr); 1017 IEEE80211_NODE_UNLOCK(nt); 1018 return ni; 1019} 1020 1021/* 1022 * Fake up a node; this handles node discovery in adhoc mode. 1023 * Note that for the driver's benefit we we treat this like 1024 * an association so the driver has an opportunity to setup 1025 * it's private state. 1026 */ 1027struct ieee80211_node * 1028ieee80211_fakeup_adhoc_node(struct ieee80211_node_table *nt, 1029 const u_int8_t macaddr[IEEE80211_ADDR_LEN]) 1030{ 1031 struct ieee80211com *ic = nt->nt_ic; 1032 struct ieee80211_node *ni; 1033 1034 ni = ieee80211_dup_bss(nt, macaddr); 1035 if (ni != NULL) { 1036 /* XXX no rate negotiation; just dup */ 1037 ni->ni_rates = ic->ic_bss->ni_rates; 1038 if (ic->ic_newassoc != NULL) 1039 ic->ic_newassoc(ic, ni, 1); 1040 /* XXX not right for 802.1x/WPA */ 1041 ieee80211_node_authorize(ic, ni); 1042 ieee80211_ref_node(ni); /* hold reference */ 1043 } 1044 return ni; 1045} 1046 1047/* 1048 * Locate the node for sender, track state, and then pass the 1049 * (referenced) node up to the 802.11 layer for its use. We 1050 * are required to pass some node so we fall back to ic_bss 1051 * when this frame is from an unknown sender. The 802.11 layer 1052 * knows this means the sender wasn't in the node table and 1053 * acts accordingly. 1054 */ 1055struct ieee80211_node * 1056#ifdef IEEE80211_DEBUG_REFCNT 1057ieee80211_find_rxnode_debug(struct ieee80211com *ic, 1058 const struct ieee80211_frame_min *wh, const char *func, int line) 1059#else 1060ieee80211_find_rxnode(struct ieee80211com *ic, 1061 const struct ieee80211_frame_min *wh) 1062#endif 1063{ 1064#define IS_CTL(wh) \ 1065 ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL) 1066#define IS_PSPOLL(wh) \ 1067 ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 1068 struct ieee80211_node_table *nt; 1069 struct ieee80211_node *ni; 1070 1071 /* XXX may want scanned nodes in the neighbor table for adhoc */ 1072 if (ic->ic_opmode == IEEE80211_M_STA || 1073 ic->ic_opmode == IEEE80211_M_MONITOR || 1074 (ic->ic_flags & IEEE80211_F_SCAN)) 1075 nt = &ic->ic_scan; 1076 else 1077 nt = ic->ic_sta; 1078 /* XXX check ic_bss first in station mode */ 1079 /* XXX 4-address frames? */ 1080 IEEE80211_NODE_LOCK(nt); 1081 if (IS_CTL(wh) && !IS_PSPOLL(wh) /*&& !IS_RTS(ah)*/) 1082 ni = _ieee80211_find_node(nt, wh->i_addr1); 1083 else 1084 ni = _ieee80211_find_node(nt, wh->i_addr2); 1085 IEEE80211_NODE_UNLOCK(nt); 1086 1087 return (ni != NULL ? ni : ieee80211_ref_node(ic->ic_bss)); 1088#undef IS_PSPOLL 1089#undef IS_CTL 1090} 1091 1092/* 1093 * Return a reference to the appropriate node for sending 1094 * a data frame. This handles node discovery in adhoc networks. 1095 */ 1096struct ieee80211_node * 1097#ifdef IEEE80211_DEBUG_REFCNT 1098ieee80211_find_txnode_debug(struct ieee80211com *ic, const u_int8_t *macaddr, 1099 const char *func, int line) 1100#else 1101ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr) 1102#endif 1103{ 1104 struct ieee80211_node_table *nt = ic->ic_sta; 1105 struct ieee80211_node *ni; 1106 1107 /* 1108 * The destination address should be in the node table 1109 * unless we are operating in station mode or this is a 1110 * multicast/broadcast frame. 1111 */ 1112 if (nt == NULL || IEEE80211_IS_MULTICAST(macaddr)) 1113 return ieee80211_ref_node(ic->ic_bss); 1114 1115 /* XXX can't hold lock across dup_bss 'cuz of recursive locking */ 1116 IEEE80211_NODE_LOCK(nt); 1117 ni = _ieee80211_find_node(nt, macaddr); 1118 IEEE80211_NODE_UNLOCK(nt); 1119 1120 if (ni == NULL) { 1121 if (ic->ic_opmode == IEEE80211_M_IBSS || 1122 ic->ic_opmode == IEEE80211_M_AHDEMO) 1123 ni = ieee80211_fakeup_adhoc_node(nt, macaddr); 1124 else { 1125 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 1126 "[%s] no node, discard frame (%s)\n", 1127 ether_sprintf(macaddr), __func__); 1128 ic->ic_stats.is_tx_nonode++; 1129 } 1130 } 1131 return ni; 1132} 1133 1134/* 1135 * Like find but search based on the channel too. 1136 */ 1137struct ieee80211_node * 1138#ifdef IEEE80211_DEBUG_REFCNT 1139ieee80211_find_node_with_channel_debug(struct ieee80211_node_table *nt, 1140 const u_int8_t *macaddr, struct ieee80211_channel *chan, 1141 const char *func, int line) 1142#else 1143ieee80211_find_node_with_channel(struct ieee80211_node_table *nt, 1144 const u_int8_t *macaddr, struct ieee80211_channel *chan) 1145#endif 1146{ 1147 struct ieee80211_node *ni; 1148 int hash; 1149 1150 hash = IEEE80211_NODE_HASH(macaddr); 1151 IEEE80211_NODE_LOCK(nt); 1152 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 1153 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && 1154 ni->ni_chan == chan) { 1155 ieee80211_ref_node(ni); /* mark referenced */ 1156 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1157#ifdef IEEE80211_DEBUG_REFCNT 1158 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 1159#else 1160 "%s %s refcnt %d\n", __func__, 1161#endif 1162 ether_sprintf(ni->ni_macaddr), 1163 ieee80211_node_refcnt(ni)); 1164 break; 1165 } 1166 } 1167 IEEE80211_NODE_UNLOCK(nt); 1168 return ni; 1169} 1170 1171/* 1172 * Like find but search based on the ssid too. 1173 */ 1174struct ieee80211_node * 1175#ifdef IEEE80211_DEBUG_REFCNT 1176ieee80211_find_node_with_ssid_debug(struct ieee80211_node_table *nt, 1177 const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid, 1178 const char *func, int line) 1179#else 1180ieee80211_find_node_with_ssid(struct ieee80211_node_table *nt, 1181 const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid) 1182#endif 1183{ 1184 struct ieee80211com *ic = nt->nt_ic; 1185 struct ieee80211_node *ni; 1186 int hash; 1187 1188 hash = IEEE80211_NODE_HASH(macaddr); 1189 IEEE80211_NODE_LOCK(nt); 1190 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 1191 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && 1192 ni->ni_esslen == ic->ic_des_esslen && 1193 memcmp(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen) == 0) { 1194 ieee80211_ref_node(ni); /* mark referenced */ 1195 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1196#ifdef IEEE80211_DEBUG_REFCNT 1197 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 1198#else 1199 "%s %s refcnt %d\n", __func__, 1200#endif 1201 ether_sprintf(ni->ni_macaddr), 1202 ieee80211_node_refcnt(ni)); 1203 break; 1204 } 1205 } 1206 IEEE80211_NODE_UNLOCK(nt); 1207 return ni; 1208} 1209 1210 1211static void 1212_ieee80211_free_node(struct ieee80211_node *ni) 1213{ 1214 struct ieee80211com *ic = ni->ni_ic; 1215 struct ieee80211_node_table *nt = ni->ni_table; 1216 1217 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1218 "%s %s in %s table\n", __func__, ether_sprintf(ni->ni_macaddr), 1219 nt != NULL ? nt->nt_name : "<gone>"); 1220 1221 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1222 if (nt != NULL) { 1223 TAILQ_REMOVE(&nt->nt_node, ni, ni_list); 1224 LIST_REMOVE(ni, ni_hash); 1225 } 1226 ic->ic_node_free(ni); 1227} 1228 1229void 1230#ifdef IEEE80211_DEBUG_REFCNT 1231ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line) 1232#else 1233ieee80211_free_node(struct ieee80211_node *ni) 1234#endif 1235{ 1236 struct ieee80211_node_table *nt = ni->ni_table; 1237 1238#ifdef IEEE80211_DEBUG_REFCNT 1239 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1240 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 1241 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1); 1242#endif 1243 if (ieee80211_node_dectestref(ni)) { 1244 /* 1245 * Beware; if the node is marked gone then it's already 1246 * been removed from the table and we cannot assume the 1247 * table still exists. Regardless, there's no need to lock 1248 * the table. 1249 */ 1250 if (ni->ni_table != NULL) { 1251 IEEE80211_NODE_LOCK(nt); 1252 _ieee80211_free_node(ni); 1253 IEEE80211_NODE_UNLOCK(nt); 1254 } else 1255 _ieee80211_free_node(ni); 1256 } 1257} 1258 1259/* 1260 * Reclaim a node. If this is the last reference count then 1261 * do the normal free work. Otherwise remove it from the node 1262 * table and mark it gone by clearing the back-reference. 1263 */ 1264static void 1265node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni) 1266{ 1267 1268 if (!ieee80211_node_dectestref(ni)) { 1269 /* 1270 * Other references are present, just remove the 1271 * node from the table so it cannot be found. When 1272 * the references are dropped storage will be 1273 * reclaimed. This normally only happens for ic_bss. 1274 */ 1275 TAILQ_REMOVE(&nt->nt_node, ni, ni_list); 1276 LIST_REMOVE(ni, ni_hash); 1277 ni->ni_table = NULL; /* clear reference */ 1278 } else 1279 _ieee80211_free_node(ni); 1280} 1281 1282static void 1283ieee80211_free_allnodes_locked(struct ieee80211_node_table *nt) 1284{ 1285 struct ieee80211com *ic = nt->nt_ic; 1286 struct ieee80211_node *ni; 1287 1288 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1289 "%s: free all nodes in %s table\n", __func__, nt->nt_name); 1290 1291 while ((ni = TAILQ_FIRST(&nt->nt_node)) != NULL) { 1292 if (ni->ni_associd != 0) { 1293 if (ic->ic_auth->ia_node_leave != NULL) 1294 ic->ic_auth->ia_node_leave(ic, ni); 1295 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1296 } 1297 node_reclaim(nt, ni); 1298 } 1299 ieee80211_reset_erp(ic); 1300} 1301 1302static void 1303ieee80211_free_allnodes(struct ieee80211_node_table *nt) 1304{ 1305 1306 IEEE80211_NODE_LOCK(nt); 1307 ieee80211_free_allnodes_locked(nt); 1308 IEEE80211_NODE_UNLOCK(nt); 1309} 1310 1311/* 1312 * Timeout entries in the scan cache. 1313 */ 1314static void 1315ieee80211_timeout_scan_candidates(struct ieee80211_node_table *nt) 1316{ 1317 struct ieee80211com *ic = nt->nt_ic; 1318 struct ieee80211_node *ni, *tni; 1319 1320 IEEE80211_NODE_LOCK(nt); 1321 ni = ic->ic_bss; 1322 /* XXX belongs elsewhere */ 1323 if (ni->ni_rxfrag[0] != NULL && ticks > ni->ni_rxfragstamp + hz) { 1324 m_freem(ni->ni_rxfrag[0]); 1325 ni->ni_rxfrag[0] = NULL; 1326 } 1327 TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, tni) { 1328 if (ni->ni_inact && --ni->ni_inact == 0) { 1329 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1330 "[%s] scan candidate purged from cache " 1331 "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr), 1332 ieee80211_node_refcnt(ni)-1); 1333 node_reclaim(nt, ni); 1334 } 1335 } 1336 IEEE80211_NODE_UNLOCK(nt); 1337 1338 nt->nt_inact_timer = IEEE80211_INACT_WAIT; 1339} 1340 1341/* 1342 * Timeout inactive stations and do related housekeeping. 1343 * Note that we cannot hold the node lock while sending a 1344 * frame as this would lead to a LOR. Instead we use a 1345 * generation number to mark nodes that we've scanned and 1346 * drop the lock and restart a scan if we have to time out 1347 * a node. Since we are single-threaded by virtue of 1348 * controlling the inactivity timer we can be sure this will 1349 * process each node only once. 1350 */ 1351static void 1352ieee80211_timeout_stations(struct ieee80211_node_table *nt) 1353{ 1354 struct ieee80211com *ic = nt->nt_ic; 1355 struct ieee80211_node *ni; 1356 u_int gen; 1357 1358 IEEE80211_SCAN_LOCK(nt); 1359 gen = nt->nt_scangen++; 1360 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1361 "%s: sta scangen %u\n", __func__, gen); 1362restart: 1363 IEEE80211_NODE_LOCK(nt); 1364 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1365 if (ni->ni_scangen == gen) /* previously handled */ 1366 continue; 1367 ni->ni_scangen = gen; 1368 /* 1369 * Free fragment if not needed anymore 1370 * (last fragment older than 1s). 1371 * XXX doesn't belong here 1372 */ 1373 if (ni->ni_rxfrag[0] != NULL && 1374 ticks > ni->ni_rxfragstamp + hz) { 1375 m_freem(ni->ni_rxfrag[0]); 1376 ni->ni_rxfrag[0] = NULL; 1377 } 1378 ni->ni_inact--; 1379 if (ni->ni_associd != 0) { 1380 /* 1381 * Age frames on the power save queue. The 1382 * aging interval is 4 times the listen 1383 * interval specified by the station. This 1384 * number is factored into the age calculations 1385 * when the frame is placed on the queue. We 1386 * store ages as time differences we can check 1387 * and/or adjust only the head of the list. 1388 */ 1389 if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) { 1390 struct mbuf *m; 1391 int discard = 0; 1392 1393 IEEE80211_NODE_SAVEQ_LOCK(ni); 1394 while (IF_POLL(&ni->ni_savedq, m) != NULL && 1395 M_AGE_GET(m) < IEEE80211_INACT_WAIT) { 1396IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] discard frame, age %u\n", ether_sprintf(ni->ni_macaddr), M_AGE_GET(m));/*XXX*/ 1397 _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m); 1398 m_freem(m); 1399 discard++; 1400 } 1401 if (m != NULL) 1402 M_AGE_SUB(m, IEEE80211_INACT_WAIT); 1403 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1404 1405 if (discard != 0) { 1406 IEEE80211_DPRINTF(ic, 1407 IEEE80211_MSG_POWER, 1408 "[%s] discard %u frames for age\n", 1409 ether_sprintf(ni->ni_macaddr), 1410 discard); 1411 IEEE80211_NODE_STAT_ADD(ni, 1412 ps_discard, discard); 1413 if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) 1414 ic->ic_set_tim(ic, ni, 0); 1415 } 1416 } 1417 /* 1418 * Probe the station before time it out. We 1419 * send a null data frame which may not be 1420 * universally supported by drivers (need it 1421 * for ps-poll support so it should be...). 1422 */ 1423 if (0 < ni->ni_inact && 1424 ni->ni_inact <= ic->ic_inact_probe) { 1425 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1426 "[%s] probe station due to inactivity\n", 1427 ether_sprintf(ni->ni_macaddr)); 1428 IEEE80211_NODE_UNLOCK(nt); 1429 ieee80211_send_nulldata(ic, ni); 1430 /* XXX stat? */ 1431 goto restart; 1432 } 1433 } 1434 if (ni->ni_inact <= 0) { 1435 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1436 "[%s] station timed out due to inactivity " 1437 "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr), 1438 ieee80211_node_refcnt(ni)); 1439 /* 1440 * Send a deauthenticate frame and drop the station. 1441 * This is somewhat complicated due to reference counts 1442 * and locking. At this point a station will typically 1443 * have a reference count of 1. ieee80211_node_leave 1444 * will do a "free" of the node which will drop the 1445 * reference count. But in the meantime a reference 1446 * wil be held by the deauth frame. The actual reclaim 1447 * of the node will happen either after the tx is 1448 * completed or by ieee80211_node_leave. 1449 * 1450 * Separately we must drop the node lock before sending 1451 * in case the driver takes a lock, as this will result 1452 * in LOR between the node lock and the driver lock. 1453 */ 1454 IEEE80211_NODE_UNLOCK(nt); 1455 if (ni->ni_associd != 0) { 1456 IEEE80211_SEND_MGMT(ic, ni, 1457 IEEE80211_FC0_SUBTYPE_DEAUTH, 1458 IEEE80211_REASON_AUTH_EXPIRE); 1459 } 1460 ieee80211_node_leave(ic, ni); 1461 ic->ic_stats.is_node_timeout++; 1462 goto restart; 1463 } 1464 } 1465 IEEE80211_NODE_UNLOCK(nt); 1466 1467 IEEE80211_SCAN_UNLOCK(nt); 1468 1469 nt->nt_inact_timer = IEEE80211_INACT_WAIT; 1470} 1471 1472void 1473ieee80211_iterate_nodes(struct ieee80211_node_table *nt, ieee80211_iter_func *f, void *arg) 1474{ 1475 struct ieee80211_node *ni; 1476 u_int gen; 1477 1478 IEEE80211_SCAN_LOCK(nt); 1479 gen = nt->nt_scangen++; 1480 1481 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1482 "%s: sta scangen %u\n", __func__, gen); 1483restart: 1484 IEEE80211_NODE_LOCK(nt); 1485 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1486 if (ni->ni_scangen != gen) { 1487 ni->ni_scangen = gen; 1488 (void) ieee80211_ref_node(ni); 1489 IEEE80211_NODE_UNLOCK(nt); 1490 (*f)(arg, ni); 1491 ieee80211_free_node(ni); 1492 goto restart; 1493 } 1494 } 1495 IEEE80211_NODE_UNLOCK(nt); 1496 1497 IEEE80211_SCAN_UNLOCK(nt); 1498} 1499 1500void 1501ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni) 1502{ 1503 printf("0x%p: mac %s refcnt %d\n", ni, 1504 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); 1505 printf("\tscangen %u authmode %u flags 0x%x\n", 1506 ni->ni_scangen, ni->ni_authmode, ni->ni_flags); 1507 printf("\tassocid 0x%x txpower %u vlan %u\n", 1508 ni->ni_associd, ni->ni_txpower, ni->ni_vlan); 1509 printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n", 1510 ni->ni_txseqs[0], 1511 ni->ni_rxseqs[0] >> IEEE80211_SEQ_SEQ_SHIFT, 1512 ni->ni_rxseqs[0] & IEEE80211_SEQ_FRAG_MASK, 1513 ni->ni_rxfragstamp); 1514 printf("\trstamp %u rssi %u intval %u capinfo 0x%x\n", 1515 ni->ni_rstamp, ni->ni_rssi, ni->ni_intval, ni->ni_capinfo); 1516 printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n", 1517 ether_sprintf(ni->ni_bssid), 1518 ni->ni_esslen, ni->ni_essid, 1519 ni->ni_chan->ic_freq, ni->ni_chan->ic_flags); 1520 printf("\tfails %u inact %u txrate %u\n", 1521 ni->ni_fails, ni->ni_inact, ni->ni_txrate); 1522} 1523 1524void 1525ieee80211_dump_nodes(struct ieee80211_node_table *nt) 1526{ 1527 ieee80211_iterate_nodes(nt, 1528 (ieee80211_iter_func *) ieee80211_dump_node, nt); 1529} 1530 1531/* 1532 * Handle a station joining an 11g network. 1533 */ 1534static void 1535ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1536{ 1537 1538 /* 1539 * Station isn't capable of short slot time. Bump 1540 * the count of long slot time stations and disable 1541 * use of short slot time. Note that the actual switch 1542 * over to long slot time use may not occur until the 1543 * next beacon transmission (per sec. 7.3.1.4 of 11g). 1544 */ 1545 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { 1546 ic->ic_longslotsta++; 1547 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1548 "[%s] station needs long slot time, count %d\n", 1549 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); 1550 /* XXX vap's w/ conflicting needs won't work */ 1551 ieee80211_set_shortslottime(ic, 0); 1552 } 1553 /* 1554 * If the new station is not an ERP station 1555 * then bump the counter and enable protection 1556 * if configured. 1557 */ 1558 if (!ieee80211_iserp_rateset(ic, &ni->ni_rates)) { 1559 ic->ic_nonerpsta++; 1560 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1561 "[%s] station is !ERP, %d non-ERP stations associated\n", 1562 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); 1563 /* 1564 * If protection is configured, enable it. 1565 */ 1566 if (ic->ic_protmode != IEEE80211_PROT_NONE) { 1567 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1568 "%s: enable use of protection\n", __func__); 1569 ic->ic_flags |= IEEE80211_F_USEPROT; 1570 } 1571 /* 1572 * If station does not support short preamble 1573 * then we must enable use of Barker preamble. 1574 */ 1575 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) { 1576 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1577 "[%s] station needs long preamble\n", 1578 ether_sprintf(ni->ni_macaddr)); 1579 ic->ic_flags |= IEEE80211_F_USEBARKER; 1580 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1581 } 1582 } else 1583 ni->ni_flags |= IEEE80211_NODE_ERP; 1584} 1585 1586void 1587ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int resp) 1588{ 1589 int newassoc; 1590 1591 if (ni->ni_associd == 0) { 1592 u_int16_t aid; 1593 1594 /* 1595 * It would be good to search the bitmap 1596 * more efficiently, but this will do for now. 1597 */ 1598 for (aid = 1; aid < ic->ic_max_aid; aid++) { 1599 if (!IEEE80211_AID_ISSET(aid, 1600 ic->ic_aid_bitmap)) 1601 break; 1602 } 1603 if (aid >= ic->ic_max_aid) { 1604 IEEE80211_SEND_MGMT(ic, ni, resp, 1605 IEEE80211_REASON_ASSOC_TOOMANY); 1606 ieee80211_node_leave(ic, ni); 1607 return; 1608 } 1609 ni->ni_associd = aid | 0xc000; 1610 IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap); 1611 ic->ic_sta_assoc++; 1612 newassoc = 1; 1613 if (ic->ic_curmode == IEEE80211_MODE_11G || 1614 ic->ic_curmode == IEEE80211_MODE_TURBO_G) 1615 ieee80211_node_join_11g(ic, ni); 1616 } else 1617 newassoc = 0; 1618 1619 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, 1620 "[%s] station %sassociated at aid %d: %s preamble, %s slot time%s%s\n", 1621 ether_sprintf(ni->ni_macaddr), newassoc ? "" : "re", 1622 IEEE80211_NODE_AID(ni), 1623 ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long", 1624 ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long", 1625 ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "", 1626 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "" 1627 ); 1628 1629 /* give driver a chance to setup state like ni_txrate */ 1630 if (ic->ic_newassoc != NULL) 1631 ic->ic_newassoc(ic, ni, newassoc); 1632 ni->ni_inact_reload = ic->ic_inact_auth; 1633 ni->ni_inact = ni->ni_inact_reload; 1634 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS); 1635 /* tell the authenticator about new station */ 1636 if (ic->ic_auth->ia_node_join != NULL) 1637 ic->ic_auth->ia_node_join(ic, ni); 1638 ieee80211_notify_node_join(ic, ni, newassoc); 1639} 1640 1641/* 1642 * Handle a station leaving an 11g network. 1643 */ 1644static void 1645ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1646{ 1647 1648 KASSERT(ic->ic_curmode == IEEE80211_MODE_11G || 1649 ic->ic_curmode == IEEE80211_MODE_TURBO_G, 1650 ("not in 11g, curmode %x", ic->ic_curmode)); 1651 1652 /* 1653 * If a long slot station do the slot time bookkeeping. 1654 */ 1655 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { 1656 KASSERT(ic->ic_longslotsta > 0, 1657 ("bogus long slot station count %d", ic->ic_longslotsta)); 1658 ic->ic_longslotsta--; 1659 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1660 "[%s] long slot time station leaves, count now %d\n", 1661 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); 1662 if (ic->ic_longslotsta == 0) { 1663 /* 1664 * Re-enable use of short slot time if supported 1665 * and not operating in IBSS mode (per spec). 1666 */ 1667 if ((ic->ic_caps & IEEE80211_C_SHSLOT) && 1668 ic->ic_opmode != IEEE80211_M_IBSS) { 1669 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1670 "%s: re-enable use of short slot time\n", 1671 __func__); 1672 ieee80211_set_shortslottime(ic, 1); 1673 } 1674 } 1675 } 1676 /* 1677 * If a non-ERP station do the protection-related bookkeeping. 1678 */ 1679 if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) { 1680 KASSERT(ic->ic_nonerpsta > 0, 1681 ("bogus non-ERP station count %d", ic->ic_nonerpsta)); 1682 ic->ic_nonerpsta--; 1683 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1684 "[%s] non-ERP station leaves, count now %d\n", 1685 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); 1686 if (ic->ic_nonerpsta == 0) { 1687 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1688 "%s: disable use of protection\n", __func__); 1689 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1690 /* XXX verify mode? */ 1691 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) { 1692 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1693 "%s: re-enable use of short preamble\n", 1694 __func__); 1695 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1696 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1697 } 1698 } 1699 } 1700} 1701 1702/* 1703 * Handle bookkeeping for station deauthentication/disassociation 1704 * when operating as an ap. 1705 */ 1706void 1707ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 1708{ 1709 1710 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, 1711 "[%s] station with aid %d leaves\n", 1712 ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_AID(ni)); 1713 1714 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || 1715 ic->ic_opmode == IEEE80211_M_IBSS || 1716 ic->ic_opmode == IEEE80211_M_AHDEMO, 1717 ("unexpected operating mode %u", ic->ic_opmode)); 1718 /* 1719 * If node wasn't previously associated all 1720 * we need to do is reclaim the reference. 1721 */ 1722 /* XXX ibss mode bypasses 11g and notification */ 1723 if (ni->ni_associd == 0) 1724 goto done; 1725 /* 1726 * Tell the authenticator the station is leaving. 1727 * Note that we must do this before yanking the 1728 * association id as the authenticator uses the 1729 * associd to locate it's state block. 1730 */ 1731 if (ic->ic_auth->ia_node_leave != NULL) 1732 ic->ic_auth->ia_node_leave(ic, ni); 1733 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1734 ni->ni_associd = 0; 1735 ic->ic_sta_assoc--; 1736 1737 if (ic->ic_curmode == IEEE80211_MODE_11G || 1738 ic->ic_curmode == IEEE80211_MODE_TURBO_G) 1739 ieee80211_node_leave_11g(ic, ni); 1740 /* 1741 * Cleanup station state. In particular clear various 1742 * state that might otherwise be reused if the node 1743 * is reused before the reference count goes to zero 1744 * (and memory is reclaimed). 1745 */ 1746 ieee80211_sta_leave(ic, ni); 1747done: 1748 ni->ni_inact_reload = ic->ic_inact_init; /* just in case */ 1749 ieee80211_free_node(ni); 1750} 1751 1752u_int8_t 1753ieee80211_getrssi(struct ieee80211com *ic) 1754{ 1755#define NZ(x) ((x) == 0 ? 1 : (x)) 1756 struct ieee80211_node_table *nt = ic->ic_sta; 1757 u_int32_t rssi_samples, rssi_total; 1758 struct ieee80211_node *ni; 1759 1760 rssi_total = 0; 1761 rssi_samples = 0; 1762 switch (ic->ic_opmode) { 1763 case IEEE80211_M_IBSS: /* average of all ibss 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 if (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) { 1770 rssi_samples++; 1771 rssi_total += ic->ic_node_getrssi(ni); 1772 } 1773 break; 1774 case IEEE80211_M_AHDEMO: /* average of all neighbors */ 1775 nt = ic->ic_sta; 1776 if (nt == NULL) 1777 break; 1778 /* XXX locking */ 1779 TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list) { 1780 rssi_samples++; 1781 rssi_total += ic->ic_node_getrssi(ni); 1782 } 1783 break; 1784 case IEEE80211_M_HOSTAP: /* average of all associated stations */ 1785 nt = ic->ic_sta; 1786 if (nt == NULL) 1787 break; 1788 /* XXX locking */ 1789 TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list) 1790 if (IEEE80211_AID(ni->ni_associd) != 0) { 1791 rssi_samples++; 1792 rssi_total += ic->ic_node_getrssi(ni); 1793 } 1794 break; 1795 case IEEE80211_M_MONITOR: /* XXX */ 1796 case IEEE80211_M_STA: /* use stats from associated ap */ 1797 default: 1798 if (ic->ic_bss != NULL) 1799 rssi_total = ic->ic_node_getrssi(ic->ic_bss); 1800 rssi_samples = 1; 1801 break; 1802 } 1803 return rssi_total / NZ(rssi_samples); 1804#undef NZ 1805} 1806 1807/* 1808 * Indicate whether there are frames queued for a station in power-save mode. 1809 */ 1810static void 1811ieee80211_set_tim(struct ieee80211com *ic, struct ieee80211_node *ni, int set) 1812{ 1813 u_int16_t aid; 1814 1815 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || 1816 ic->ic_opmode == IEEE80211_M_IBSS, 1817 ("operating mode %u", ic->ic_opmode)); 1818 1819 aid = IEEE80211_AID(ni->ni_associd); 1820 KASSERT(aid < ic->ic_max_aid, 1821 ("bogus aid %u, max %u", aid, ic->ic_max_aid)); 1822 1823 IEEE80211_BEACON_LOCK(ic); 1824 if (set != (isset(ic->ic_tim_bitmap, aid) != 0)) { 1825 if (set) { 1826 setbit(ic->ic_tim_bitmap, aid); 1827 ic->ic_ps_pending++; 1828 } else { 1829 clrbit(ic->ic_tim_bitmap, aid); 1830 ic->ic_ps_pending--; 1831 } 1832 ic->ic_flags |= IEEE80211_F_TIMUPDATE; 1833 } 1834 IEEE80211_BEACON_UNLOCK(ic); 1835} 1836 1837/* 1838 * Node table support. 1839 */ 1840 1841static void 1842ieee80211_node_table_init(struct ieee80211com *ic, 1843 struct ieee80211_node_table *nt, 1844 const char *name, int inact, 1845 void (*timeout)(struct ieee80211_node_table *)) 1846{ 1847 1848 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1849 "%s %s table, inact %u\n", __func__, name, inact); 1850 1851 nt->nt_ic = ic; 1852 /* XXX need unit */ 1853 IEEE80211_NODE_LOCK_INIT(nt, ic->ic_ifp->if_xname); 1854 IEEE80211_SCAN_LOCK_INIT(nt, ic->ic_ifp->if_xname); 1855 TAILQ_INIT(&nt->nt_node); 1856 nt->nt_name = name; 1857 nt->nt_scangen = 1; 1858 nt->nt_inact_init = inact; 1859 nt->nt_timeout = timeout; 1860} 1861 1862static struct ieee80211_node_table * 1863ieee80211_node_table_alloc(struct ieee80211com *ic, 1864 const char *name, int inact, 1865 void (*timeout)(struct ieee80211_node_table *)) 1866{ 1867 struct ieee80211_node_table *nt; 1868 1869 MALLOC(nt, struct ieee80211_node_table *, 1870 sizeof(struct ieee80211_node_table), 1871 M_DEVBUF, M_NOWAIT | M_ZERO); 1872 if (nt == NULL) { 1873 printf("%s: no memory node table!\n", __func__); 1874 return NULL; 1875 } 1876 ieee80211_node_table_init(ic, nt, name, inact, timeout); 1877 return nt; 1878} 1879 1880void 1881ieee80211_node_table_reset(struct ieee80211_node_table *nt) 1882{ 1883 1884 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1885 "%s %s table\n", __func__, nt->nt_name); 1886 1887 IEEE80211_NODE_LOCK(nt); 1888 nt->nt_inact_timer = 0; 1889 ieee80211_free_allnodes_locked(nt); 1890 IEEE80211_NODE_UNLOCK(nt); 1891} 1892 1893static void 1894ieee80211_node_table_cleanup(struct ieee80211_node_table *nt) 1895{ 1896 1897 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1898 "%s %s table\n", __func__, nt->nt_name); 1899 1900 ieee80211_free_allnodes_locked(nt); 1901 IEEE80211_SCAN_LOCK_DESTROY(nt); 1902 IEEE80211_NODE_LOCK_DESTROY(nt); 1903} 1904 1905/* 1906 * NB: public for use in ieee80211_proto.c 1907 */ 1908void 1909ieee80211_node_table_free(struct ieee80211_node_table *nt) 1910{ 1911 1912 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1913 "%s %s table\n", __func__, nt->nt_name); 1914 1915 IEEE80211_NODE_LOCK(nt); 1916 nt->nt_inact_timer = 0; 1917 ieee80211_node_table_cleanup(nt); 1918 FREE(nt, M_DEVBUF); 1919} 1920