ieee80211_node.c revision 139520
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 139520 2004-12-31 21:19:59Z 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. 762 */ 763 ic->ic_sta = ieee80211_node_table_alloc(ic, 764 "neighbor", ic->ic_inact_run, 765 ieee80211_timeout_stations); 766 if (ic->ic_sta == NULL) { 767 /* 768 * Should remain in SCAN state and retry. 769 */ 770 /* XXX stat+msg */ 771 return 0; 772 } 773 } 774 775 /* 776 * Committed to selbs, setup state. 777 */ 778 obss = ic->ic_bss; 779 ic->ic_bss = selbs; 780 if (obss != NULL) 781 ieee80211_free_node(obss); 782 /* 783 * Set the erp state (mostly the slot time) to deal with 784 * the auto-select case; this should be redundant if the 785 * mode is locked. 786 */ 787 ic->ic_curmode = ieee80211_chan2mode(ic, selbs->ni_chan); 788 ieee80211_reset_erp(ic); 789 ieee80211_wme_initparams(ic); 790 if (ic->ic_opmode == IEEE80211_M_IBSS) 791 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 792 else 793 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 794 return 1; 795} 796 797/* 798 * Leave the specified IBSS/BSS network. The node is assumed to 799 * be passed in with a held reference. 800 */ 801void 802ieee80211_sta_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 803{ 804 ic->ic_node_cleanup(ni); 805 ieee80211_notify_node_leave(ic, ni); 806} 807 808static struct ieee80211_node * 809node_alloc(struct ieee80211_node_table *nt) 810{ 811 struct ieee80211_node *ni; 812 813 MALLOC(ni, struct ieee80211_node *, sizeof(struct ieee80211_node), 814 M_80211_NODE, M_NOWAIT | M_ZERO); 815 return ni; 816} 817 818/* 819 * Reclaim any resources in a node and reset any critical 820 * state. Typically nodes are free'd immediately after, 821 * but in some cases the storage may be reused so we need 822 * to insure consistent state (should probably fix that). 823 */ 824static void 825node_cleanup(struct ieee80211_node *ni) 826{ 827#define N(a) (sizeof(a)/sizeof(a[0])) 828 struct ieee80211com *ic = ni->ni_ic; 829 int i, qlen; 830 831 /* NB: preserve ni_table */ 832 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) { 833 ic->ic_ps_sta--; 834 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; 835 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 836 "[%s] power save mode off, %u sta's in ps mode\n", 837 ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta); 838 } 839 840 /* 841 * Drain power save queue and, if needed, clear TIM. 842 */ 843 IEEE80211_NODE_SAVEQ_DRAIN(ni, qlen); 844 if (qlen != 0 && ic->ic_set_tim != NULL) 845 ic->ic_set_tim(ic, ni, 0); 846 847 ni->ni_associd = 0; 848 if (ni->ni_challenge != NULL) { 849 FREE(ni->ni_challenge, M_DEVBUF); 850 ni->ni_challenge = NULL; 851 } 852 /* 853 * Preserve SSID, WPA, and WME ie's so the bss node is 854 * reusable during a re-auth/re-assoc state transition. 855 * If we remove these data they will not be recreated 856 * because they come from a probe-response or beacon frame 857 * which cannot be expected prior to the association-response. 858 * This should not be an issue when operating in other modes 859 * as stations leaving always go through a full state transition 860 * which will rebuild this state. 861 * 862 * XXX does this leave us open to inheriting old state? 863 */ 864 for (i = 0; i < N(ni->ni_rxfrag); i++) 865 if (ni->ni_rxfrag[i] != NULL) { 866 m_freem(ni->ni_rxfrag[i]); 867 ni->ni_rxfrag[i] = NULL; 868 } 869 ieee80211_crypto_delkey(ic, &ni->ni_ucastkey); 870#undef N 871} 872 873static void 874node_free(struct ieee80211_node *ni) 875{ 876 struct ieee80211com *ic = ni->ni_ic; 877 878 ic->ic_node_cleanup(ni); 879 if (ni->ni_wpa_ie != NULL) 880 FREE(ni->ni_wpa_ie, M_DEVBUF); 881 if (ni->ni_wme_ie != NULL) 882 FREE(ni->ni_wme_ie, M_DEVBUF); 883 IEEE80211_NODE_SAVEQ_DESTROY(ni); 884 FREE(ni, M_80211_NODE); 885} 886 887static u_int8_t 888node_getrssi(const struct ieee80211_node *ni) 889{ 890 return ni->ni_rssi; 891} 892 893static void 894ieee80211_setup_node(struct ieee80211_node_table *nt, 895 struct ieee80211_node *ni, const u_int8_t *macaddr) 896{ 897 struct ieee80211com *ic = nt->nt_ic; 898 int hash; 899 900 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 901 "%s %s in %s table\n", __func__, 902 ether_sprintf(macaddr), nt->nt_name); 903 904 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 905 hash = IEEE80211_NODE_HASH(macaddr); 906 ieee80211_node_initref(ni); /* mark referenced */ 907 ni->ni_chan = IEEE80211_CHAN_ANYC; 908 ni->ni_authmode = IEEE80211_AUTH_OPEN; 909 ni->ni_txpower = ic->ic_txpowlimit; /* max power */ 910 ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE); 911 ni->ni_inact = ni->ni_inact_reload = nt->nt_inact_init; 912 IEEE80211_NODE_SAVEQ_INIT(ni, "unknown"); 913 914 IEEE80211_NODE_LOCK(nt); 915 TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list); 916 LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash); 917 ni->ni_table = nt; 918 ni->ni_ic = ic; 919 IEEE80211_NODE_UNLOCK(nt); 920} 921 922struct ieee80211_node * 923ieee80211_alloc_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 924{ 925 struct ieee80211com *ic = nt->nt_ic; 926 struct ieee80211_node *ni; 927 928 ni = ic->ic_node_alloc(nt); 929 if (ni != NULL) 930 ieee80211_setup_node(nt, ni, macaddr); 931 else 932 ic->ic_stats.is_rx_nodealloc++; 933 return ni; 934} 935 936struct ieee80211_node * 937ieee80211_dup_bss(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 938{ 939 struct ieee80211com *ic = nt->nt_ic; 940 struct ieee80211_node *ni; 941 942 ni = ic->ic_node_alloc(nt); 943 if (ni != NULL) { 944 ieee80211_setup_node(nt, ni, macaddr); 945 /* 946 * Inherit from ic_bss. 947 */ 948 ni->ni_authmode = ic->ic_bss->ni_authmode; 949 ni->ni_txpower = ic->ic_bss->ni_txpower; 950 ni->ni_vlan = ic->ic_bss->ni_vlan; /* XXX?? */ 951 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); 952 ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan); 953 ni->ni_rsn = ic->ic_bss->ni_rsn; 954 } else 955 ic->ic_stats.is_rx_nodealloc++; 956 return ni; 957} 958 959static struct ieee80211_node * 960#ifdef IEEE80211_DEBUG_REFCNT 961_ieee80211_find_node_debug(struct ieee80211_node_table *nt, 962 const u_int8_t *macaddr, const char *func, int line) 963#else 964_ieee80211_find_node(struct ieee80211_node_table *nt, 965 const u_int8_t *macaddr) 966#endif 967{ 968 struct ieee80211_node *ni; 969 int hash; 970 971 IEEE80211_NODE_LOCK_ASSERT(nt); 972 973 hash = IEEE80211_NODE_HASH(macaddr); 974 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 975 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) { 976 ieee80211_ref_node(ni); /* mark referenced */ 977#ifdef IEEE80211_DEBUG_REFCNT 978 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 979 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 980 ether_sprintf(ni->ni_macaddr), 981 ieee80211_node_refcnt(ni)); 982#endif 983 return ni; 984 } 985 } 986 return NULL; 987} 988#ifdef IEEE80211_DEBUG_REFCNT 989#define _ieee80211_find_node(nt, mac) \ 990 _ieee80211_find_node_debug(nt, mac, func, line) 991#endif 992 993struct ieee80211_node * 994#ifdef IEEE80211_DEBUG_REFCNT 995ieee80211_find_node_debug(struct ieee80211_node_table *nt, 996 const u_int8_t *macaddr, const char *func, int line) 997#else 998ieee80211_find_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 999#endif 1000{ 1001 struct ieee80211_node *ni; 1002 1003 IEEE80211_NODE_LOCK(nt); 1004 ni = _ieee80211_find_node(nt, macaddr); 1005 IEEE80211_NODE_UNLOCK(nt); 1006 return ni; 1007} 1008 1009/* 1010 * Fake up a node; this handles node discovery in adhoc mode. 1011 * Note that for the driver's benefit we we treat this like 1012 * an association so the driver has an opportunity to setup 1013 * it's private state. 1014 */ 1015struct ieee80211_node * 1016ieee80211_fakeup_adhoc_node(struct ieee80211_node_table *nt, 1017 const u_int8_t macaddr[IEEE80211_ADDR_LEN]) 1018{ 1019 struct ieee80211com *ic = nt->nt_ic; 1020 struct ieee80211_node *ni; 1021 1022 ni = ieee80211_dup_bss(nt, macaddr); 1023 if (ni != NULL) { 1024 /* XXX no rate negotiation; just dup */ 1025 ni->ni_rates = ic->ic_bss->ni_rates; 1026 if (ic->ic_newassoc) 1027 ic->ic_newassoc(ic, ni, 1); 1028 /* XXX not right for 802.1x/WPA */ 1029 ieee80211_node_authorize(ic, ni); 1030 ieee80211_ref_node(ni); /* hold reference */ 1031 } 1032 return ni; 1033} 1034 1035/* 1036 * Locate the node for sender, track state, and then pass the 1037 * (referenced) node up to the 802.11 layer for its use. We 1038 * are required to pass some node so we fall back to ic_bss 1039 * when this frame is from an unknown sender. The 802.11 layer 1040 * knows this means the sender wasn't in the node table and 1041 * acts accordingly. 1042 */ 1043struct ieee80211_node * 1044#ifdef IEEE80211_DEBUG_REFCNT 1045ieee80211_find_rxnode_debug(struct ieee80211com *ic, 1046 const struct ieee80211_frame_min *wh, const char *func, int line) 1047#else 1048ieee80211_find_rxnode(struct ieee80211com *ic, 1049 const struct ieee80211_frame_min *wh) 1050#endif 1051{ 1052#define IS_CTL(wh) \ 1053 ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL) 1054#define IS_PSPOLL(wh) \ 1055 ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 1056 struct ieee80211_node_table *nt; 1057 struct ieee80211_node *ni; 1058 1059 /* XXX may want scanned nodes in the neighbor table for adhoc */ 1060 if (ic->ic_opmode == IEEE80211_M_STA || 1061 ic->ic_opmode == IEEE80211_M_MONITOR || 1062 (ic->ic_flags & IEEE80211_F_SCAN)) 1063 nt = &ic->ic_scan; 1064 else 1065 nt = ic->ic_sta; 1066 /* XXX check ic_bss first in station mode */ 1067 /* XXX 4-address frames? */ 1068 IEEE80211_NODE_LOCK(nt); 1069 if (IS_CTL(wh) && !IS_PSPOLL(wh) /*&& !IS_RTS(ah)*/) 1070 ni = _ieee80211_find_node(nt, wh->i_addr1); 1071 else 1072 ni = _ieee80211_find_node(nt, wh->i_addr2); 1073 IEEE80211_NODE_UNLOCK(nt); 1074 1075 return (ni != NULL ? ni : ieee80211_ref_node(ic->ic_bss)); 1076#undef IS_PSPOLL 1077#undef IS_CTL 1078} 1079 1080/* 1081 * Return a reference to the appropriate node for sending 1082 * a data frame. This handles node discovery in adhoc networks. 1083 */ 1084struct ieee80211_node * 1085#ifdef IEEE80211_DEBUG_REFCNT 1086ieee80211_find_txnode_debug(struct ieee80211com *ic, const u_int8_t *macaddr, 1087 const char *func, int line) 1088#else 1089ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr) 1090#endif 1091{ 1092 struct ieee80211_node_table *nt = ic->ic_sta; 1093 struct ieee80211_node *ni; 1094 1095 /* 1096 * The destination address should be in the node table 1097 * unless we are operating in station mode or this is a 1098 * multicast/broadcast frame. 1099 */ 1100 if (nt == NULL || IEEE80211_IS_MULTICAST(macaddr)) 1101 return ieee80211_ref_node(ic->ic_bss); 1102 1103 /* XXX can't hold lock across dup_bss 'cuz of recursive locking */ 1104 IEEE80211_NODE_LOCK(nt); 1105 ni = _ieee80211_find_node(nt, macaddr); 1106 IEEE80211_NODE_UNLOCK(nt); 1107 1108 if (ni == NULL) { 1109 if (ic->ic_opmode == IEEE80211_M_IBSS || 1110 ic->ic_opmode == IEEE80211_M_AHDEMO) 1111 ni = ieee80211_fakeup_adhoc_node(nt, macaddr); 1112 else { 1113 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 1114 "[%s] no node, discard frame (%s)\n", 1115 ether_sprintf(macaddr), __func__); 1116 ic->ic_stats.is_tx_nonode++; 1117 } 1118 } 1119 return ni; 1120} 1121 1122/* 1123 * Like find but search based on the channel too. 1124 */ 1125struct ieee80211_node * 1126#ifdef IEEE80211_DEBUG_REFCNT 1127ieee80211_find_node_with_channel_debug(struct ieee80211_node_table *nt, 1128 const u_int8_t *macaddr, struct ieee80211_channel *chan, 1129 const char *func, int line) 1130#else 1131ieee80211_find_node_with_channel(struct ieee80211_node_table *nt, 1132 const u_int8_t *macaddr, struct ieee80211_channel *chan) 1133#endif 1134{ 1135 struct ieee80211_node *ni; 1136 int hash; 1137 1138 hash = IEEE80211_NODE_HASH(macaddr); 1139 IEEE80211_NODE_LOCK(nt); 1140 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 1141 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && 1142 ni->ni_chan == chan) { 1143 ieee80211_ref_node(ni); /* mark referenced */ 1144 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1145#ifdef IEEE80211_DEBUG_REFCNT 1146 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 1147#else 1148 "%s %s refcnt %d\n", __func__, 1149#endif 1150 ether_sprintf(ni->ni_macaddr), 1151 ieee80211_node_refcnt(ni)); 1152 break; 1153 } 1154 } 1155 IEEE80211_NODE_UNLOCK(nt); 1156 return ni; 1157} 1158 1159/* 1160 * Like find but search based on the ssid too. 1161 */ 1162struct ieee80211_node * 1163#ifdef IEEE80211_DEBUG_REFCNT 1164ieee80211_find_node_with_ssid_debug(struct ieee80211_node_table *nt, 1165 const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid, 1166 const char *func, int line) 1167#else 1168ieee80211_find_node_with_ssid(struct ieee80211_node_table *nt, 1169 const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid) 1170#endif 1171{ 1172 struct ieee80211com *ic = nt->nt_ic; 1173 struct ieee80211_node *ni; 1174 int hash; 1175 1176 hash = IEEE80211_NODE_HASH(macaddr); 1177 IEEE80211_NODE_LOCK(nt); 1178 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 1179 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && 1180 ni->ni_esslen == ic->ic_des_esslen && 1181 memcmp(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen) == 0) { 1182 ieee80211_ref_node(ni); /* mark referenced */ 1183 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1184#ifdef IEEE80211_DEBUG_REFCNT 1185 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 1186#else 1187 "%s %s refcnt %d\n", __func__, 1188#endif 1189 ether_sprintf(ni->ni_macaddr), 1190 ieee80211_node_refcnt(ni)); 1191 break; 1192 } 1193 } 1194 IEEE80211_NODE_UNLOCK(nt); 1195 return ni; 1196} 1197 1198 1199static void 1200_ieee80211_free_node(struct ieee80211_node *ni) 1201{ 1202 struct ieee80211com *ic = ni->ni_ic; 1203 struct ieee80211_node_table *nt = ni->ni_table; 1204 1205 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1206 "%s %s in %s table\n", __func__, ether_sprintf(ni->ni_macaddr), 1207 nt != NULL ? nt->nt_name : "<gone>"); 1208 1209 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1210 if (nt != NULL) { 1211 TAILQ_REMOVE(&nt->nt_node, ni, ni_list); 1212 LIST_REMOVE(ni, ni_hash); 1213 } 1214 ic->ic_node_free(ni); 1215} 1216 1217void 1218#ifdef IEEE80211_DEBUG_REFCNT 1219ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line) 1220#else 1221ieee80211_free_node(struct ieee80211_node *ni) 1222#endif 1223{ 1224 struct ieee80211_node_table *nt = ni->ni_table; 1225 1226#ifdef IEEE80211_DEBUG_REFCNT 1227 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1228 "%s (%s:%u) %s refcnt %d\n", __func__, func, line, 1229 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1); 1230#endif 1231 if (ieee80211_node_dectestref(ni)) { 1232 /* 1233 * Beware; if the node is marked gone then it's already 1234 * been removed from the table and we cannot assume the 1235 * table still exists. Regardless, there's no need to lock 1236 * the table. 1237 */ 1238 if (ni->ni_table != NULL) { 1239 IEEE80211_NODE_LOCK(nt); 1240 _ieee80211_free_node(ni); 1241 IEEE80211_NODE_UNLOCK(nt); 1242 } else 1243 _ieee80211_free_node(ni); 1244 } 1245} 1246 1247/* 1248 * Reclaim a node. If this is the last reference count then 1249 * do the normal free work. Otherwise remove it from the node 1250 * table and mark it gone by clearing the back-reference. 1251 */ 1252static void 1253node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni) 1254{ 1255 1256 if (!ieee80211_node_dectestref(ni)) { 1257 /* 1258 * Other references are present, just remove the 1259 * node from the table so it cannot be found. When 1260 * the references are dropped storage will be 1261 * reclaimed. This normally only happens for ic_bss. 1262 */ 1263 TAILQ_REMOVE(&nt->nt_node, ni, ni_list); 1264 LIST_REMOVE(ni, ni_hash); 1265 ni->ni_table = NULL; /* clear reference */ 1266 } else 1267 _ieee80211_free_node(ni); 1268} 1269 1270static void 1271ieee80211_free_allnodes_locked(struct ieee80211_node_table *nt) 1272{ 1273 struct ieee80211com *ic = nt->nt_ic; 1274 struct ieee80211_node *ni; 1275 1276 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1277 "%s: free all nodes in %s table\n", __func__, nt->nt_name); 1278 1279 while ((ni = TAILQ_FIRST(&nt->nt_node)) != NULL) { 1280 if (ni->ni_associd != 0) { 1281 if (ic->ic_auth->ia_node_leave != NULL) 1282 ic->ic_auth->ia_node_leave(ic, ni); 1283 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1284 } 1285 node_reclaim(nt, ni); 1286 } 1287 ieee80211_reset_erp(ic); 1288} 1289 1290static void 1291ieee80211_free_allnodes(struct ieee80211_node_table *nt) 1292{ 1293 1294 IEEE80211_NODE_LOCK(nt); 1295 ieee80211_free_allnodes_locked(nt); 1296 IEEE80211_NODE_UNLOCK(nt); 1297} 1298 1299/* 1300 * Timeout entries in the scan cache. 1301 */ 1302static void 1303ieee80211_timeout_scan_candidates(struct ieee80211_node_table *nt) 1304{ 1305 struct ieee80211com *ic = nt->nt_ic; 1306 struct ieee80211_node *ni, *tni; 1307 1308 IEEE80211_NODE_LOCK(nt); 1309 ni = ic->ic_bss; 1310 /* XXX belongs elsewhere */ 1311 if (ni->ni_rxfrag[0] != NULL && ticks > ni->ni_rxfragstamp + hz) { 1312 m_freem(ni->ni_rxfrag[0]); 1313 ni->ni_rxfrag[0] = NULL; 1314 } 1315 TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, tni) { 1316 if (ni->ni_inact && --ni->ni_inact == 0) { 1317 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1318 "[%s] scan candidate purged from cache " 1319 "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr), 1320 ieee80211_node_refcnt(ni)-1); 1321 node_reclaim(nt, ni); 1322 } 1323 } 1324 IEEE80211_NODE_UNLOCK(nt); 1325 1326 nt->nt_inact_timer = IEEE80211_INACT_WAIT; 1327} 1328 1329/* 1330 * Timeout inactive stations and do related housekeeping. 1331 * Note that we cannot hold the node lock while sending a 1332 * frame as this would lead to a LOR. Instead we use a 1333 * generation number to mark nodes that we've scanned and 1334 * drop the lock and restart a scan if we have to time out 1335 * a node. Since we are single-threaded by virtue of 1336 * controlling the inactivity timer we can be sure this will 1337 * process each node only once. 1338 */ 1339static void 1340ieee80211_timeout_stations(struct ieee80211_node_table *nt) 1341{ 1342 struct ieee80211com *ic = nt->nt_ic; 1343 struct ieee80211_node *ni; 1344 u_int gen; 1345 1346 IEEE80211_SCAN_LOCK(nt); 1347 gen = nt->nt_scangen++; 1348 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1349 "%s: sta scangen %u\n", __func__, gen); 1350restart: 1351 IEEE80211_NODE_LOCK(nt); 1352 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1353 if (ni->ni_scangen == gen) /* previously handled */ 1354 continue; 1355 ni->ni_scangen = gen; 1356 /* 1357 * Free fragment if not needed anymore 1358 * (last fragment older than 1s). 1359 * XXX doesn't belong here 1360 */ 1361 if (ni->ni_rxfrag[0] != NULL && 1362 ticks > ni->ni_rxfragstamp + hz) { 1363 m_freem(ni->ni_rxfrag[0]); 1364 ni->ni_rxfrag[0] = NULL; 1365 } 1366 ni->ni_inact--; 1367 if (ni->ni_associd != 0) { 1368 /* 1369 * Age frames on the power save queue. The 1370 * aging interval is 4 times the listen 1371 * interval specified by the station. This 1372 * number is factored into the age calculations 1373 * when the frame is placed on the queue. We 1374 * store ages as time differences we can check 1375 * and/or adjust only the head of the list. 1376 */ 1377 if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) { 1378 struct mbuf *m; 1379 int discard = 0; 1380 1381 IEEE80211_NODE_SAVEQ_LOCK(ni); 1382 while (IF_POLL(&ni->ni_savedq, m) != NULL && 1383 M_AGE_GET(m) < IEEE80211_INACT_WAIT) { 1384IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] discard frame, age %u\n", ether_sprintf(ni->ni_macaddr), M_AGE_GET(m));/*XXX*/ 1385 _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m); 1386 m_freem(m); 1387 discard++; 1388 } 1389 if (m != NULL) 1390 M_AGE_SUB(m, IEEE80211_INACT_WAIT); 1391 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1392 1393 if (discard != 0) { 1394 IEEE80211_DPRINTF(ic, 1395 IEEE80211_MSG_POWER, 1396 "[%s] discard %u frames for age\n", 1397 ether_sprintf(ni->ni_macaddr), 1398 discard); 1399 IEEE80211_NODE_STAT_ADD(ni, 1400 ps_discard, discard); 1401 if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) 1402 ic->ic_set_tim(ic, ni, 0); 1403 } 1404 } 1405 /* 1406 * Probe the station before time it out. We 1407 * send a null data frame which may not be 1408 * universally supported by drivers (need it 1409 * for ps-poll support so it should be...). 1410 */ 1411 if (ni->ni_inact == ic->ic_inact_probe) { 1412 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1413 "[%s] probe station due to inactivity\n", 1414 ether_sprintf(ni->ni_macaddr)); 1415 IEEE80211_NODE_UNLOCK(nt); 1416 ieee80211_send_nulldata(ic, ni); 1417 /* XXX stat? */ 1418 goto restart; 1419 } 1420 } 1421 if (ni->ni_inact <= 0) { 1422 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1423 "[%s] station timed out due to inactivity " 1424 "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr), 1425 ieee80211_node_refcnt(ni)); 1426 /* 1427 * Send a deauthenticate frame and drop the station. 1428 * This is somewhat complicated due to reference counts 1429 * and locking. At this point a station will typically 1430 * have a reference count of 1. ieee80211_node_leave 1431 * will do a "free" of the node which will drop the 1432 * reference count. But in the meantime a reference 1433 * wil be held by the deauth frame. The actual reclaim 1434 * of the node will happen either after the tx is 1435 * completed or by ieee80211_node_leave. 1436 * 1437 * Separately we must drop the node lock before sending 1438 * in case the driver takes a lock, as this will result 1439 * in LOR between the node lock and the driver lock. 1440 */ 1441 IEEE80211_NODE_UNLOCK(nt); 1442 if (ni->ni_associd != 0) { 1443 IEEE80211_SEND_MGMT(ic, ni, 1444 IEEE80211_FC0_SUBTYPE_DEAUTH, 1445 IEEE80211_REASON_AUTH_EXPIRE); 1446 } 1447 ieee80211_node_leave(ic, ni); 1448 ic->ic_stats.is_node_timeout++; 1449 goto restart; 1450 } 1451 } 1452 IEEE80211_NODE_UNLOCK(nt); 1453 1454 IEEE80211_SCAN_UNLOCK(nt); 1455 1456 nt->nt_inact_timer = IEEE80211_INACT_WAIT; 1457} 1458 1459void 1460ieee80211_iterate_nodes(struct ieee80211_node_table *nt, ieee80211_iter_func *f, void *arg) 1461{ 1462 struct ieee80211_node *ni; 1463 u_int gen; 1464 1465 IEEE80211_SCAN_LOCK(nt); 1466 gen = nt->nt_scangen++; 1467 1468 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1469 "%s: sta scangen %u\n", __func__, gen); 1470restart: 1471 IEEE80211_NODE_LOCK(nt); 1472 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1473 if (ni->ni_scangen != gen) { 1474 ni->ni_scangen = gen; 1475 (void) ieee80211_ref_node(ni); 1476 IEEE80211_NODE_UNLOCK(nt); 1477 (*f)(arg, ni); 1478 ieee80211_free_node(ni); 1479 goto restart; 1480 } 1481 } 1482 IEEE80211_NODE_UNLOCK(nt); 1483 1484 IEEE80211_SCAN_UNLOCK(nt); 1485} 1486 1487void 1488ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni) 1489{ 1490 printf("0x%p: mac %s refcnt %d\n", ni, 1491 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); 1492 printf("\tscangen %u authmode %u flags 0x%x\n", 1493 ni->ni_scangen, ni->ni_authmode, ni->ni_flags); 1494 printf("\tassocid 0x%x txpower %u vlan %u\n", 1495 ni->ni_associd, ni->ni_txpower, ni->ni_vlan); 1496 printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n", 1497 ni->ni_txseqs[0], 1498 ni->ni_rxseqs[0] >> IEEE80211_SEQ_SEQ_SHIFT, 1499 ni->ni_rxseqs[0] & IEEE80211_SEQ_FRAG_MASK, 1500 ni->ni_rxfragstamp); 1501 printf("\trstamp %u rssi %u intval %u capinfo 0x%x\n", 1502 ni->ni_rstamp, ni->ni_rssi, ni->ni_intval, ni->ni_capinfo); 1503 printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n", 1504 ether_sprintf(ni->ni_bssid), 1505 ni->ni_esslen, ni->ni_essid, 1506 ni->ni_chan->ic_freq, ni->ni_chan->ic_flags); 1507 printf("\tfails %u inact %u txrate %u\n", 1508 ni->ni_fails, ni->ni_inact, ni->ni_txrate); 1509} 1510 1511void 1512ieee80211_dump_nodes(struct ieee80211_node_table *nt) 1513{ 1514 ieee80211_iterate_nodes(nt, 1515 (ieee80211_iter_func *) ieee80211_dump_node, nt); 1516} 1517 1518/* 1519 * Handle a station joining an 11g network. 1520 */ 1521static void 1522ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1523{ 1524 1525 /* 1526 * Station isn't capable of short slot time. Bump 1527 * the count of long slot time stations and disable 1528 * use of short slot time. Note that the actual switch 1529 * over to long slot time use may not occur until the 1530 * next beacon transmission (per sec. 7.3.1.4 of 11g). 1531 */ 1532 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { 1533 ic->ic_longslotsta++; 1534 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1535 "[%s] station needs long slot time, count %d\n", 1536 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); 1537 /* XXX vap's w/ conflicting needs won't work */ 1538 ieee80211_set_shortslottime(ic, 0); 1539 } 1540 /* 1541 * If the new station is not an ERP station 1542 * then bump the counter and enable protection 1543 * if configured. 1544 */ 1545 if (!ieee80211_iserp_rateset(ic, &ni->ni_rates)) { 1546 ic->ic_nonerpsta++; 1547 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1548 "[%s] station is !ERP, %d non-ERP stations associated\n", 1549 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); 1550 /* 1551 * If protection is configured, enable it. 1552 */ 1553 if (ic->ic_protmode != IEEE80211_PROT_NONE) { 1554 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1555 "%s: enable use of protection\n", __func__); 1556 ic->ic_flags |= IEEE80211_F_USEPROT; 1557 } 1558 /* 1559 * If station does not support short preamble 1560 * then we must enable use of Barker preamble. 1561 */ 1562 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) { 1563 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1564 "[%s] station needs long preamble\n", 1565 ether_sprintf(ni->ni_macaddr)); 1566 ic->ic_flags |= IEEE80211_F_USEBARKER; 1567 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1568 } 1569 } else 1570 ni->ni_flags |= IEEE80211_NODE_ERP; 1571} 1572 1573void 1574ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int resp) 1575{ 1576 int newassoc; 1577 1578 if (ni->ni_associd == 0) { 1579 u_int16_t aid; 1580 1581 /* 1582 * It would be good to search the bitmap 1583 * more efficiently, but this will do for now. 1584 */ 1585 for (aid = 1; aid < ic->ic_max_aid; aid++) { 1586 if (!IEEE80211_AID_ISSET(aid, 1587 ic->ic_aid_bitmap)) 1588 break; 1589 } 1590 if (aid >= ic->ic_max_aid) { 1591 IEEE80211_SEND_MGMT(ic, ni, resp, 1592 IEEE80211_REASON_ASSOC_TOOMANY); 1593 ieee80211_node_leave(ic, ni); 1594 return; 1595 } 1596 ni->ni_associd = aid | 0xc000; 1597 IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap); 1598 ic->ic_sta_assoc++; 1599 newassoc = 1; 1600 if (ic->ic_curmode == IEEE80211_MODE_11G) 1601 ieee80211_node_join_11g(ic, ni); 1602 } else 1603 newassoc = 0; 1604 1605 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, 1606 "[%s] station %s associated at aid %d\n", 1607 ether_sprintf(ni->ni_macaddr), newassoc ? "newly" : "already", 1608 IEEE80211_NODE_AID(ni)); 1609 1610 /* give driver a chance to setup state like ni_txrate */ 1611 if (ic->ic_newassoc) 1612 ic->ic_newassoc(ic, ni, newassoc); 1613 ni->ni_inact_reload = ic->ic_inact_run; 1614 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS); 1615 /* tell the authenticator about new station */ 1616 if (ic->ic_auth->ia_node_join != NULL) 1617 ic->ic_auth->ia_node_join(ic, ni); 1618 ieee80211_notify_node_join(ic, ni, newassoc); 1619} 1620 1621/* 1622 * Handle a station leaving an 11g network. 1623 */ 1624static void 1625ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1626{ 1627 1628 KASSERT(ic->ic_curmode == IEEE80211_MODE_11G, 1629 ("not in 11g, curmode %x", ic->ic_curmode)); 1630 1631 /* 1632 * If a long slot station do the slot time bookkeeping. 1633 */ 1634 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { 1635 KASSERT(ic->ic_longslotsta > 0, 1636 ("bogus long slot station count %d", ic->ic_longslotsta)); 1637 ic->ic_longslotsta--; 1638 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1639 "[%s] long slot time station leaves, count now %d\n", 1640 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); 1641 if (ic->ic_longslotsta == 0) { 1642 /* 1643 * Re-enable use of short slot time if supported 1644 * and not operating in IBSS mode (per spec). 1645 */ 1646 if ((ic->ic_caps & IEEE80211_C_SHSLOT) && 1647 ic->ic_opmode != IEEE80211_M_IBSS) { 1648 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1649 "%s: re-enable use of short slot time\n", 1650 __func__); 1651 ieee80211_set_shortslottime(ic, 1); 1652 } 1653 } 1654 } 1655 /* 1656 * If a non-ERP station do the protection-related bookkeeping. 1657 */ 1658 if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) { 1659 KASSERT(ic->ic_nonerpsta > 0, 1660 ("bogus non-ERP station count %d", ic->ic_nonerpsta)); 1661 ic->ic_nonerpsta--; 1662 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1663 "[%s] non-ERP station leaves, count now %d\n", 1664 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); 1665 if (ic->ic_nonerpsta == 0) { 1666 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1667 "%s: disable use of protection\n", __func__); 1668 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1669 /* XXX verify mode? */ 1670 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) { 1671 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1672 "%s: re-enable use of short preamble\n", 1673 __func__); 1674 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1675 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1676 } 1677 } 1678 } 1679} 1680 1681/* 1682 * Handle bookkeeping for station deauthentication/disassociation 1683 * when operating as an ap. 1684 */ 1685void 1686ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 1687{ 1688 1689 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, 1690 "[%s] station with aid %d leaves\n", 1691 ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_AID(ni)); 1692 1693 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || 1694 ic->ic_opmode == IEEE80211_M_IBSS || 1695 ic->ic_opmode == IEEE80211_M_AHDEMO, 1696 ("unexpected operating mode %u", ic->ic_opmode)); 1697 /* 1698 * If node wasn't previously associated all 1699 * we need to do is reclaim the reference. 1700 */ 1701 /* XXX ibss mode bypasses 11g and notification */ 1702 if (ni->ni_associd == 0) 1703 goto done; 1704 /* 1705 * Tell the authenticator the station is leaving. 1706 * Note that we must do this before yanking the 1707 * association id as the authenticator uses the 1708 * associd to locate it's state block. 1709 */ 1710 if (ic->ic_auth->ia_node_leave != NULL) 1711 ic->ic_auth->ia_node_leave(ic, ni); 1712 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1713 ni->ni_associd = 0; 1714 ic->ic_sta_assoc--; 1715 1716 if (ic->ic_curmode == IEEE80211_MODE_11G) 1717 ieee80211_node_leave_11g(ic, ni); 1718 /* 1719 * Cleanup station state. In particular clear various 1720 * state that might otherwise be reused if the node 1721 * is reused before the reference count goes to zero 1722 * (and memory is reclaimed). 1723 */ 1724 ieee80211_sta_leave(ic, ni); 1725done: 1726 ni->ni_inact_reload = ic->ic_inact_init; /* just in case */ 1727 ieee80211_free_node(ni); 1728} 1729 1730u_int8_t 1731ieee80211_getrssi(struct ieee80211com *ic) 1732{ 1733#define NZ(x) ((x) == 0 ? 1 : (x)) 1734 struct ieee80211_node_table *nt = ic->ic_sta; 1735 u_int32_t rssi_samples, rssi_total; 1736 struct ieee80211_node *ni; 1737 1738 rssi_total = 0; 1739 rssi_samples = 0; 1740 switch (ic->ic_opmode) { 1741 case IEEE80211_M_IBSS: /* average of all ibss neighbors */ 1742 nt = ic->ic_sta; 1743 if (nt == NULL) 1744 break; 1745 /* XXX locking */ 1746 TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list) 1747 if (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) { 1748 rssi_samples++; 1749 rssi_total += ic->ic_node_getrssi(ni); 1750 } 1751 break; 1752 case IEEE80211_M_AHDEMO: /* average of all neighbors */ 1753 nt = ic->ic_sta; 1754 if (nt == NULL) 1755 break; 1756 /* XXX locking */ 1757 TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list) { 1758 rssi_samples++; 1759 rssi_total += ic->ic_node_getrssi(ni); 1760 } 1761 break; 1762 case IEEE80211_M_HOSTAP: /* average of all associated stations */ 1763 nt = ic->ic_sta; 1764 if (nt == NULL) 1765 break; 1766 /* XXX locking */ 1767 TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list) 1768 if (IEEE80211_AID(ni->ni_associd) != 0) { 1769 rssi_samples++; 1770 rssi_total += ic->ic_node_getrssi(ni); 1771 } 1772 break; 1773 case IEEE80211_M_MONITOR: /* XXX */ 1774 case IEEE80211_M_STA: /* use stats from associated ap */ 1775 default: 1776 if (ic->ic_bss != NULL) 1777 rssi_total = ic->ic_node_getrssi(ic->ic_bss); 1778 rssi_samples = 1; 1779 break; 1780 } 1781 return rssi_total / NZ(rssi_samples); 1782#undef NZ 1783} 1784 1785/* 1786 * Indicate whether there are frames queued for a station in power-save mode. 1787 */ 1788static void 1789ieee80211_set_tim(struct ieee80211com *ic, struct ieee80211_node *ni, int set) 1790{ 1791 u_int16_t aid; 1792 1793 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || 1794 ic->ic_opmode == IEEE80211_M_IBSS, 1795 ("operating mode %u", ic->ic_opmode)); 1796 1797 aid = IEEE80211_AID(ni->ni_associd); 1798 KASSERT(aid < ic->ic_max_aid, 1799 ("bogus aid %u, max %u", aid, ic->ic_max_aid)); 1800 1801 IEEE80211_BEACON_LOCK(ic); 1802 if (set != (isset(ic->ic_tim_bitmap, aid) != 0)) { 1803 if (set) { 1804 setbit(ic->ic_tim_bitmap, aid); 1805 ic->ic_ps_pending++; 1806 } else { 1807 clrbit(ic->ic_tim_bitmap, aid); 1808 ic->ic_ps_pending--; 1809 } 1810 ic->ic_flags |= IEEE80211_F_TIMUPDATE; 1811 } 1812 IEEE80211_BEACON_UNLOCK(ic); 1813} 1814 1815/* 1816 * Node table support. 1817 */ 1818 1819static void 1820ieee80211_node_table_init(struct ieee80211com *ic, 1821 struct ieee80211_node_table *nt, 1822 const char *name, int inact, 1823 void (*timeout)(struct ieee80211_node_table *)) 1824{ 1825 1826 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1827 "%s %s table, inact %u\n", __func__, name, inact); 1828 1829 nt->nt_ic = ic; 1830 /* XXX need unit */ 1831 IEEE80211_NODE_LOCK_INIT(nt, ic->ic_ifp->if_xname); 1832 IEEE80211_SCAN_LOCK_INIT(nt, ic->ic_ifp->if_xname); 1833 TAILQ_INIT(&nt->nt_node); 1834 nt->nt_name = name; 1835 nt->nt_scangen = 1; 1836 nt->nt_inact_init = inact; 1837 nt->nt_timeout = timeout; 1838} 1839 1840static struct ieee80211_node_table * 1841ieee80211_node_table_alloc(struct ieee80211com *ic, 1842 const char *name, int inact, 1843 void (*timeout)(struct ieee80211_node_table *)) 1844{ 1845 struct ieee80211_node_table *nt; 1846 1847 MALLOC(nt, struct ieee80211_node_table *, 1848 sizeof(struct ieee80211_node_table), 1849 M_DEVBUF, M_NOWAIT | M_ZERO); 1850 if (nt == NULL) { 1851 printf("%s: no memory node table!\n", __func__); 1852 return NULL; 1853 } 1854 ieee80211_node_table_init(ic, nt, name, inact, timeout); 1855 return nt; 1856} 1857 1858void 1859ieee80211_node_table_reset(struct ieee80211_node_table *nt) 1860{ 1861 1862 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1863 "%s %s table\n", __func__, nt->nt_name); 1864 1865 IEEE80211_NODE_LOCK(nt); 1866 nt->nt_inact_timer = 0; 1867 ieee80211_free_allnodes_locked(nt); 1868 IEEE80211_NODE_UNLOCK(nt); 1869} 1870 1871static void 1872ieee80211_node_table_cleanup(struct ieee80211_node_table *nt) 1873{ 1874 1875 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1876 "%s %s table\n", __func__, nt->nt_name); 1877 1878 ieee80211_free_allnodes_locked(nt); 1879 IEEE80211_SCAN_LOCK_DESTROY(nt); 1880 IEEE80211_NODE_LOCK_DESTROY(nt); 1881} 1882 1883/* 1884 * NB: public for use in ieee80211_proto.c 1885 */ 1886void 1887ieee80211_node_table_free(struct ieee80211_node_table *nt) 1888{ 1889 1890 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1891 "%s %s table\n", __func__, nt->nt_name); 1892 1893 IEEE80211_NODE_LOCK(nt); 1894 nt->nt_inact_timer = 0; 1895 ieee80211_node_table_cleanup(nt); 1896 FREE(nt, M_DEVBUF); 1897} 1898