ieee80211_node.c revision 143300
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 143300 2005-03-08 17:04:14Z 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 void ieee80211_node_table_cleanup(struct ieee80211_node_table *nt); 72 73MALLOC_DEFINE(M_80211_NODE, "80211node", "802.11 node state"); 74 75void 76ieee80211_node_attach(struct ieee80211com *ic) 77{ 78 79 ieee80211_node_table_init(ic, &ic->ic_sta, "station", 80 IEEE80211_INACT_INIT, ieee80211_timeout_stations); 81 ieee80211_node_table_init(ic, &ic->ic_scan, "scan", 82 IEEE80211_INACT_SCAN, ieee80211_timeout_scan_candidates); 83 84 ic->ic_node_alloc = node_alloc; 85 ic->ic_node_free = node_free; 86 ic->ic_node_cleanup = node_cleanup; 87 ic->ic_node_getrssi = node_getrssi; 88 89 /* default station inactivity timer setings */ 90 ic->ic_inact_init = IEEE80211_INACT_INIT; 91 ic->ic_inact_auth = IEEE80211_INACT_AUTH; 92 ic->ic_inact_run = IEEE80211_INACT_RUN; 93 ic->ic_inact_probe = IEEE80211_INACT_PROBE; 94 95 /* XXX defer */ 96 if (ic->ic_max_aid == 0) 97 ic->ic_max_aid = IEEE80211_AID_DEF; 98 else if (ic->ic_max_aid > IEEE80211_AID_MAX) 99 ic->ic_max_aid = IEEE80211_AID_MAX; 100 MALLOC(ic->ic_aid_bitmap, u_int32_t *, 101 howmany(ic->ic_max_aid, 32) * sizeof(u_int32_t), 102 M_DEVBUF, M_NOWAIT | M_ZERO); 103 if (ic->ic_aid_bitmap == NULL) { 104 /* XXX no way to recover */ 105 printf("%s: no memory for AID bitmap!\n", __func__); 106 ic->ic_max_aid = 0; 107 } 108 109 /* XXX defer until using hostap/ibss mode */ 110 ic->ic_tim_len = howmany(ic->ic_max_aid, 8) * sizeof(u_int8_t); 111 MALLOC(ic->ic_tim_bitmap, u_int8_t *, ic->ic_tim_len, 112 M_DEVBUF, M_NOWAIT | M_ZERO); 113 if (ic->ic_tim_bitmap == NULL) { 114 /* XXX no way to recover */ 115 printf("%s: no memory for TIM bitmap!\n", __func__); 116 } 117 ic->ic_set_tim = ieee80211_set_tim; /* NB: driver should override */ 118} 119 120void 121ieee80211_node_lateattach(struct ieee80211com *ic) 122{ 123 struct ieee80211_node *ni; 124 struct ieee80211_rsnparms *rsn; 125 126 ni = ieee80211_alloc_node(&ic->ic_scan, ic->ic_myaddr); 127 KASSERT(ni != NULL, ("unable to setup inital BSS node")); 128 /* 129 * Setup "global settings" in the bss node so that 130 * each new station automatically inherits them. 131 */ 132 rsn = &ni->ni_rsn; 133 /* WEP, TKIP, and AES-CCM are always supported */ 134 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_WEP; 135 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_TKIP; 136 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_AES_CCM; 137 if (ic->ic_caps & IEEE80211_C_AES) 138 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_AES_OCB; 139 if (ic->ic_caps & IEEE80211_C_CKIP) 140 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_CKIP; 141 /* 142 * Default unicast cipher to WEP for 802.1x use. If 143 * WPA is enabled the management code will set these 144 * values to reflect. 145 */ 146 rsn->rsn_ucastcipher = IEEE80211_CIPHER_WEP; 147 rsn->rsn_ucastkeylen = 104 / NBBY; 148 /* 149 * WPA says the multicast cipher is the lowest unicast 150 * cipher supported. But we skip WEP which would 151 * otherwise be used based on this criteria. 152 */ 153 rsn->rsn_mcastcipher = IEEE80211_CIPHER_TKIP; 154 rsn->rsn_mcastkeylen = 128 / NBBY; 155 156 /* 157 * We support both WPA-PSK and 802.1x; the one used 158 * is determined by the authentication mode and the 159 * setting of the PSK state. 160 */ 161 rsn->rsn_keymgmtset = WPA_ASE_8021X_UNSPEC | WPA_ASE_8021X_PSK; 162 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 163 164 ic->ic_bss = ieee80211_ref_node(ni); /* hold reference */ 165 ic->ic_auth = ieee80211_authenticator_get(ni->ni_authmode); 166} 167 168void 169ieee80211_node_detach(struct ieee80211com *ic) 170{ 171 172 if (ic->ic_bss != NULL) { 173 ieee80211_free_node(ic->ic_bss); 174 ic->ic_bss = NULL; 175 } 176 ieee80211_node_table_cleanup(&ic->ic_scan); 177 ieee80211_node_table_cleanup(&ic->ic_sta); 178 if (ic->ic_aid_bitmap != NULL) { 179 FREE(ic->ic_aid_bitmap, M_DEVBUF); 180 ic->ic_aid_bitmap = NULL; 181 } 182 if (ic->ic_tim_bitmap != NULL) { 183 FREE(ic->ic_tim_bitmap, M_DEVBUF); 184 ic->ic_tim_bitmap = NULL; 185 } 186} 187 188/* 189 * Port authorize/unauthorize interfaces for use by an authenticator. 190 */ 191 192void 193ieee80211_node_authorize(struct ieee80211com *ic, struct ieee80211_node *ni) 194{ 195 ni->ni_flags |= IEEE80211_NODE_AUTH; 196 ni->ni_inact_reload = ic->ic_inact_run; 197} 198 199void 200ieee80211_node_unauthorize(struct ieee80211com *ic, struct ieee80211_node *ni) 201{ 202 ni->ni_flags &= ~IEEE80211_NODE_AUTH; 203} 204 205/* 206 * Set/change the channel. The rate set is also updated as 207 * to insure a consistent view by drivers. 208 */ 209static __inline void 210ieee80211_set_chan(struct ieee80211com *ic, 211 struct ieee80211_node *ni, struct ieee80211_channel *chan) 212{ 213 ni->ni_chan = chan; 214 ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, chan)]; 215} 216 217/* 218 * AP scanning support. 219 */ 220 221#ifdef IEEE80211_DEBUG 222static void 223dump_chanlist(const u_char chans[]) 224{ 225 const char *sep; 226 int i; 227 228 sep = " "; 229 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 230 if (isset(chans, i)) { 231 printf("%s%u", sep, i); 232 sep = ", "; 233 } 234} 235#endif /* IEEE80211_DEBUG */ 236 237/* 238 * Initialize the channel set to scan based on the 239 * of available channels and the current PHY mode. 240 */ 241static void 242ieee80211_reset_scan(struct ieee80211com *ic) 243{ 244 245 /* XXX ic_des_chan should be handled with ic_chan_active */ 246 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC) { 247 memset(ic->ic_chan_scan, 0, sizeof(ic->ic_chan_scan)); 248 setbit(ic->ic_chan_scan, 249 ieee80211_chan2ieee(ic, ic->ic_des_chan)); 250 } else 251 memcpy(ic->ic_chan_scan, ic->ic_chan_active, 252 sizeof(ic->ic_chan_active)); 253 /* NB: hack, setup so next_scan starts with the first channel */ 254 if (ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC) 255 ieee80211_set_chan(ic, ic->ic_bss, 256 &ic->ic_channels[IEEE80211_CHAN_MAX]); 257#ifdef IEEE80211_DEBUG 258 if (ieee80211_msg_scan(ic)) { 259 printf("%s: scan set:", __func__); 260 dump_chanlist(ic->ic_chan_scan); 261 printf(" start chan %u\n", 262 ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan)); 263 } 264#endif /* IEEE80211_DEBUG */ 265} 266 267/* 268 * Begin an active scan. 269 */ 270void 271ieee80211_begin_scan(struct ieee80211com *ic, int reset) 272{ 273 274 ic->ic_scan.nt_scangen++; 275 /* 276 * In all but hostap mode scanning starts off in 277 * an active mode before switching to passive. 278 */ 279 if (ic->ic_opmode != IEEE80211_M_HOSTAP) { 280 ic->ic_flags |= IEEE80211_F_ASCAN; 281 ic->ic_stats.is_scan_active++; 282 } else 283 ic->ic_stats.is_scan_passive++; 284 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 285 "begin %s scan in %s mode, scangen %u\n", 286 (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive", 287 ieee80211_phymode_name[ic->ic_curmode], ic->ic_scan.nt_scangen); 288 /* 289 * Clear scan state and flush any previously seen AP's. 290 */ 291 ieee80211_reset_scan(ic); 292 if (reset) 293 ieee80211_free_allnodes(&ic->ic_scan); 294 295 ic->ic_flags |= IEEE80211_F_SCAN; 296 297 /* Scan the next channel. */ 298 ieee80211_next_scan(ic); 299} 300 301/* 302 * Switch to the next channel marked for scanning. 303 */ 304int 305ieee80211_next_scan(struct ieee80211com *ic) 306{ 307 struct ieee80211_channel *chan; 308 309 /* 310 * Insure any previous mgt frame timeouts don't fire. 311 * This assumes the driver does the right thing in 312 * flushing anything queued in the driver and below. 313 */ 314 ic->ic_mgt_timer = 0; 315 316 chan = ic->ic_bss->ni_chan; 317 do { 318 if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) 319 chan = &ic->ic_channels[0]; 320 if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { 321 clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); 322 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 323 "%s: chan %d->%d\n", __func__, 324 ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan), 325 ieee80211_chan2ieee(ic, chan)); 326 ieee80211_set_chan(ic, ic->ic_bss, chan); 327#ifdef notyet 328 /* XXX driver state change */ 329 /* 330 * Scan next channel. If doing an active scan 331 * and the channel is not marked passive-only 332 * then send a probe request. Otherwise just 333 * listen for beacons on the channel. 334 */ 335 if ((ic->ic_flags & IEEE80211_F_ASCAN) && 336 (ni->ni_chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) { 337 IEEE80211_SEND_MGMT(ic, ni, 338 IEEE80211_FC0_SUBTYPE_PROBE_REQ, 0); 339 } 340#else 341 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 342#endif 343 return 1; 344 } 345 } while (chan != ic->ic_bss->ni_chan); 346 ieee80211_end_scan(ic); 347 return 0; 348} 349 350static __inline void 351copy_bss(struct ieee80211_node *nbss, const struct ieee80211_node *obss) 352{ 353 /* propagate useful state */ 354 nbss->ni_authmode = obss->ni_authmode; 355 nbss->ni_txpower = obss->ni_txpower; 356 nbss->ni_vlan = obss->ni_vlan; 357 nbss->ni_rsn = obss->ni_rsn; 358 /* XXX statistics? */ 359} 360 361void 362ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) 363{ 364 struct ieee80211_node_table *nt; 365 struct ieee80211_node *ni; 366 367 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 368 "%s: creating ibss\n", __func__); 369 370 /* 371 * Create the station/neighbor table. Note that for adhoc 372 * mode we make the initial inactivity timer longer since 373 * we create nodes only through discovery and they typically 374 * are long-lived associations. 375 */ 376 nt = &ic->ic_sta; 377 IEEE80211_NODE_LOCK(nt); 378 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 379 nt->nt_name = "station"; 380 nt->nt_inact_init = ic->ic_inact_init; 381 } else { 382 nt->nt_name = "neighbor"; 383 nt->nt_inact_init = ic->ic_inact_run; 384 } 385 IEEE80211_NODE_UNLOCK(nt); 386 387 ni = ieee80211_alloc_node(nt, ic->ic_myaddr); 388 if (ni == NULL) { 389 /* XXX recovery? */ 390 return; 391 } 392 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); 393 ni->ni_esslen = ic->ic_des_esslen; 394 memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); 395 copy_bss(ni, ic->ic_bss); 396 ni->ni_intval = ic->ic_lintval; 397 if (ic->ic_flags & IEEE80211_F_PRIVACY) 398 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; 399 if (ic->ic_phytype == IEEE80211_T_FH) { 400 ni->ni_fhdwell = 200; /* XXX */ 401 ni->ni_fhindex = 1; 402 } 403 if (ic->ic_opmode == IEEE80211_M_IBSS) { 404 ic->ic_flags |= IEEE80211_F_SIBSS; 405 ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS; /* XXX */ 406 if (ic->ic_flags & IEEE80211_F_DESBSSID) 407 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid); 408 else 409 ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ 410 } 411 /* 412 * Fix the channel and related attributes. 413 */ 414 ieee80211_set_chan(ic, ni, chan); 415 ic->ic_curmode = ieee80211_chan2mode(ic, chan); 416 /* 417 * Do mode-specific rate setup. 418 */ 419 if (ic->ic_curmode == IEEE80211_MODE_11G) { 420 /* 421 * Use a mixed 11b/11g rate set. 422 */ 423 ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11G); 424 } else if (ic->ic_curmode == IEEE80211_MODE_11B) { 425 /* 426 * Force pure 11b rate set. 427 */ 428 ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11B); 429 } 430 431 (void) ieee80211_sta_join(ic, ieee80211_ref_node(ni)); 432} 433 434void 435ieee80211_reset_bss(struct ieee80211com *ic) 436{ 437 struct ieee80211_node *ni, *obss; 438 439 ieee80211_node_table_reset(&ic->ic_scan); 440 ieee80211_node_table_reset(&ic->ic_sta); 441 442 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 copy_bss(ni, obss); 448 ni->ni_intval = ic->ic_lintval; 449 ieee80211_free_node(obss); 450 } 451} 452 453static int 454ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni) 455{ 456 u_int8_t rate; 457 int fail; 458 459 fail = 0; 460 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) 461 fail |= 0x01; 462 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 463 ni->ni_chan != ic->ic_des_chan) 464 fail |= 0x01; 465 if (ic->ic_opmode == IEEE80211_M_IBSS) { 466 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 467 fail |= 0x02; 468 } else { 469 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) 470 fail |= 0x02; 471 } 472 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 473 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 474 fail |= 0x04; 475 } else { 476 /* XXX does this mean privacy is supported or required? */ 477 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) 478 fail |= 0x04; 479 } 480 rate = ieee80211_fix_rate(ic, ni, 481 IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE); 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 rssia = ic->ic_node_getrssi(a); 550 rssib = ic->ic_node_getrssi(b); 551 if (abs(rssib - rssia) < 5) { 552 /* best/max rate preferred if signal level close enough XXX */ 553 maxa = maxrate(a); 554 maxb = maxrate(b); 555 if (maxa != maxb) 556 return maxa - maxb; 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 * Mark an ongoing scan stopped. 572 */ 573void 574ieee80211_cancel_scan(struct ieee80211com *ic) 575{ 576 577 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s: end %s scan\n", 578 __func__, 579 (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive"); 580 581 ic->ic_flags &= ~(IEEE80211_F_SCAN | IEEE80211_F_ASCAN); 582} 583 584/* 585 * Complete a scan of potential channels. 586 */ 587void 588ieee80211_end_scan(struct ieee80211com *ic) 589{ 590 struct ieee80211_node_table *nt = &ic->ic_scan; 591 struct ieee80211_node *ni, *selbs; 592 593 ieee80211_cancel_scan(ic); 594 ieee80211_notify_scan_done(ic); 595 596 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 597 u_int8_t maxrssi[IEEE80211_CHAN_MAX]; /* XXX off stack? */ 598 int i, bestchan; 599 u_int8_t rssi; 600 601 /* 602 * The passive scan to look for existing AP's completed, 603 * select a channel to camp on. Identify the channels 604 * that already have one or more AP's and try to locate 605 * an unoccupied one. If that fails, pick a channel that 606 * looks to be quietest. 607 */ 608 memset(maxrssi, 0, sizeof(maxrssi)); 609 IEEE80211_NODE_LOCK(nt); 610 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 611 rssi = ic->ic_node_getrssi(ni); 612 i = ieee80211_chan2ieee(ic, ni->ni_chan); 613 if (rssi > maxrssi[i]) 614 maxrssi[i] = rssi; 615 } 616 IEEE80211_NODE_UNLOCK(nt); 617 /* XXX select channel more intelligently */ 618 bestchan = -1; 619 for (i = 0; i < IEEE80211_CHAN_MAX; i++) 620 if (isset(ic->ic_chan_active, i)) { 621 /* 622 * If the channel is unoccupied the max rssi 623 * should be zero; just take it. Otherwise 624 * track the channel with the lowest rssi and 625 * use that when all channels appear occupied. 626 */ 627 if (maxrssi[i] == 0) { 628 bestchan = i; 629 break; 630 } 631 if (maxrssi[i] < maxrssi[bestchan]) 632 bestchan = i; 633 } 634 if (bestchan != -1) { 635 ieee80211_create_ibss(ic, &ic->ic_channels[bestchan]); 636 return; 637 } 638 /* no suitable channel, should not happen */ 639 } 640 641 /* 642 * When manually sequencing the state machine; scan just once 643 * regardless of whether we have a candidate or not. The 644 * controlling application is expected to setup state and 645 * initiate an association. 646 */ 647 if (ic->ic_roaming == IEEE80211_ROAMING_MANUAL) 648 return; 649 /* 650 * Automatic sequencing; look for a candidate and 651 * if found join the network. 652 */ 653 /* NB: unlocked read should be ok */ 654 if (TAILQ_FIRST(&nt->nt_node) == NULL) { 655 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 656 "%s: no scan candidate\n", __func__); 657 notfound: 658 if (ic->ic_opmode == IEEE80211_M_IBSS && 659 (ic->ic_flags & IEEE80211_F_IBSSON) && 660 ic->ic_des_esslen != 0) { 661 ieee80211_create_ibss(ic, ic->ic_ibss_chan); 662 return; 663 } 664 /* 665 * Reset the list of channels to scan and start again. 666 */ 667 ieee80211_reset_scan(ic); 668 ic->ic_flags |= IEEE80211_F_SCAN; 669 ieee80211_next_scan(ic); 670 return; 671 } 672 selbs = NULL; 673 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "\t%s\n", 674 "macaddr bssid chan rssi rate flag wep essid"); 675 IEEE80211_NODE_LOCK(nt); 676 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 677 if (ni->ni_fails) { 678 /* 679 * The configuration of the access points may change 680 * during my scan. So delete the entry for the AP 681 * and retry to associate if there is another beacon. 682 */ 683 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 684 "%s: skip scan candidate %s, fails %u\n", 685 __func__, ether_sprintf(ni->ni_macaddr), 686 ni->ni_fails); 687 ni->ni_fails++; 688#if 0 689 if (ni->ni_fails++ > 2) 690 ieee80211_free_node(ni); 691#endif 692 continue; 693 } 694 if (ieee80211_match_bss(ic, ni) == 0) { 695 if (selbs == NULL) 696 selbs = ni; 697 else if (ieee80211_node_compare(ic, ni, selbs) > 0) 698 selbs = ni; 699 } 700 } 701 if (selbs != NULL) /* NB: grab ref while dropping lock */ 702 (void) ieee80211_ref_node(selbs); 703 IEEE80211_NODE_UNLOCK(nt); 704 if (selbs == NULL) 705 goto notfound; 706 if (!ieee80211_sta_join(ic, selbs)) { 707 ieee80211_free_node(selbs); 708 goto notfound; 709 } 710} 711 712/* 713 * Handle 802.11 ad hoc network merge. The 714 * convention, set by the Wireless Ethernet Compatibility Alliance 715 * (WECA), is that an 802.11 station will change its BSSID to match 716 * the "oldest" 802.11 ad hoc network, on the same channel, that 717 * has the station's desired SSID. The "oldest" 802.11 network 718 * sends beacons with the greatest TSF timestamp. 719 * 720 * The caller is assumed to validate TSF's before attempting a merge. 721 * 722 * Return !0 if the BSSID changed, 0 otherwise. 723 */ 724int 725ieee80211_ibss_merge(struct ieee80211com *ic, struct ieee80211_node *ni) 726{ 727 728 if (ni == ic->ic_bss || 729 IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) { 730 /* unchanged, nothing to do */ 731 return 0; 732 } 733 if (ieee80211_match_bss(ic, ni) != 0) { /* capabilities mismatch */ 734 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 735 "%s: merge failed, capabilities mismatch\n", __func__); 736 ic->ic_stats.is_ibss_capmismatch++; 737 return 0; 738 } 739 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 740 "%s: new bssid %s: %s preamble, %s slot time%s\n", __func__, 741 ether_sprintf(ni->ni_bssid), 742 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 743 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 744 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "" 745 ); 746 return ieee80211_sta_join(ic, ieee80211_ref_node(ni)); 747} 748 749/* 750 * Join the specified IBSS/BSS network. The node is assumed to 751 * be passed in with a held reference. 752 */ 753int 754ieee80211_sta_join(struct ieee80211com *ic, struct ieee80211_node *selbs) 755{ 756 struct ieee80211_node *obss; 757 758 if (ic->ic_opmode == IEEE80211_M_IBSS) { 759 struct ieee80211_node_table *nt; 760 /* 761 * Delete unusable rates; we've already checked 762 * that the negotiated rate set is acceptable. 763 */ 764 ieee80211_fix_rate(ic, selbs, IEEE80211_F_DODEL); 765 /* 766 * Fillin the neighbor table; it will already 767 * exist if we are simply switching mastership. 768 * XXX ic_sta always setup so this is unnecessary? 769 */ 770 nt = &ic->ic_sta; 771 IEEE80211_NODE_LOCK(nt); 772 nt->nt_name = "neighbor"; 773 nt->nt_inact_init = ic->ic_inact_run; 774 IEEE80211_NODE_UNLOCK(nt); 775 } 776 777 /* 778 * Committed to selbs, setup state. 779 */ 780 obss = ic->ic_bss; 781 ic->ic_bss = selbs; /* NB: caller assumed to bump refcnt */ 782 if (obss != NULL) 783 ieee80211_free_node(obss); 784 /* 785 * Set the erp state (mostly the slot time) to deal with 786 * the auto-select case; this should be redundant if the 787 * mode is locked. 788 */ 789 ic->ic_curmode = ieee80211_chan2mode(ic, selbs->ni_chan); 790 ieee80211_reset_erp(ic); 791 ieee80211_wme_initparams(ic); 792 793 if (ic->ic_opmode == IEEE80211_M_STA) 794 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); 795 else 796 ieee80211_new_state(ic, IEEE80211_S_RUN, -1); 797 return 1; 798} 799 800/* 801 * Leave the specified IBSS/BSS network. The node is assumed to 802 * be passed in with a held reference. 803 */ 804void 805ieee80211_sta_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 806{ 807 ic->ic_node_cleanup(ni); 808 ieee80211_notify_node_leave(ic, ni); 809} 810 811static struct ieee80211_node * 812node_alloc(struct ieee80211_node_table *nt) 813{ 814 struct ieee80211_node *ni; 815 816 MALLOC(ni, struct ieee80211_node *, sizeof(struct ieee80211_node), 817 M_80211_NODE, M_NOWAIT | M_ZERO); 818 return ni; 819} 820 821/* 822 * Reclaim any resources in a node and reset any critical 823 * state. Typically nodes are free'd immediately after, 824 * but in some cases the storage may be reused so we need 825 * to insure consistent state (should probably fix that). 826 */ 827static void 828node_cleanup(struct ieee80211_node *ni) 829{ 830#define N(a) (sizeof(a)/sizeof(a[0])) 831 struct ieee80211com *ic = ni->ni_ic; 832 int i, qlen; 833 834 /* NB: preserve ni_table */ 835 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) { 836 ic->ic_ps_sta--; 837 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; 838 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 839 "[%s] power save mode off, %u sta's in ps mode\n", 840 ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta); 841 } 842 843 /* 844 * Drain power save queue and, if needed, clear TIM. 845 */ 846 IEEE80211_NODE_SAVEQ_DRAIN(ni, qlen); 847 if (qlen != 0 && ic->ic_set_tim != NULL) 848 ic->ic_set_tim(ic, ni, 0); 849 850 ni->ni_associd = 0; 851 if (ni->ni_challenge != NULL) { 852 FREE(ni->ni_challenge, M_DEVBUF); 853 ni->ni_challenge = NULL; 854 } 855 /* 856 * Preserve SSID, WPA, and WME ie's so the bss node is 857 * reusable during a re-auth/re-assoc state transition. 858 * If we remove these data they will not be recreated 859 * because they come from a probe-response or beacon frame 860 * which cannot be expected prior to the association-response. 861 * This should not be an issue when operating in other modes 862 * as stations leaving always go through a full state transition 863 * which will rebuild this state. 864 * 865 * XXX does this leave us open to inheriting old state? 866 */ 867 for (i = 0; i < N(ni->ni_rxfrag); i++) 868 if (ni->ni_rxfrag[i] != NULL) { 869 m_freem(ni->ni_rxfrag[i]); 870 ni->ni_rxfrag[i] = NULL; 871 } 872 ieee80211_crypto_delkey(ic, &ni->ni_ucastkey); 873#undef N 874} 875 876static void 877node_free(struct ieee80211_node *ni) 878{ 879 struct ieee80211com *ic = ni->ni_ic; 880 881 ic->ic_node_cleanup(ni); 882 if (ni->ni_wpa_ie != NULL) 883 FREE(ni->ni_wpa_ie, M_DEVBUF); 884 if (ni->ni_wme_ie != NULL) 885 FREE(ni->ni_wme_ie, M_DEVBUF); 886 IEEE80211_NODE_SAVEQ_DESTROY(ni); 887 FREE(ni, M_80211_NODE); 888} 889 890static u_int8_t 891node_getrssi(const struct ieee80211_node *ni) 892{ 893 return ni->ni_rssi; 894} 895 896static void 897ieee80211_setup_node(struct ieee80211_node_table *nt, 898 struct ieee80211_node *ni, const u_int8_t *macaddr) 899{ 900 struct ieee80211com *ic = nt->nt_ic; 901 int hash; 902 903 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 904 "%s %p<%s> in %s table\n", __func__, ni, 905 ether_sprintf(macaddr), nt->nt_name); 906 907 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); 908 hash = IEEE80211_NODE_HASH(macaddr); 909 ieee80211_node_initref(ni); /* mark referenced */ 910 ni->ni_chan = IEEE80211_CHAN_ANYC; 911 ni->ni_authmode = IEEE80211_AUTH_OPEN; 912 ni->ni_txpower = ic->ic_txpowlimit; /* max power */ 913 ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE); 914 ni->ni_inact_reload = nt->nt_inact_init; 915 ni->ni_inact = ni->ni_inact_reload; 916 IEEE80211_NODE_SAVEQ_INIT(ni, "unknown"); 917 918 IEEE80211_NODE_LOCK(nt); 919 TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list); 920 LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash); 921 ni->ni_table = nt; 922 ni->ni_ic = ic; 923 IEEE80211_NODE_UNLOCK(nt); 924} 925 926struct ieee80211_node * 927ieee80211_alloc_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 928{ 929 struct ieee80211com *ic = nt->nt_ic; 930 struct ieee80211_node *ni; 931 932 ni = ic->ic_node_alloc(nt); 933 if (ni != NULL) 934 ieee80211_setup_node(nt, ni, macaddr); 935 else 936 ic->ic_stats.is_rx_nodealloc++; 937 return ni; 938} 939 940struct ieee80211_node * 941ieee80211_dup_bss(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 942{ 943 struct ieee80211com *ic = nt->nt_ic; 944 struct ieee80211_node *ni; 945 946 ni = ic->ic_node_alloc(nt); 947 if (ni != NULL) { 948 ieee80211_setup_node(nt, ni, macaddr); 949 /* 950 * Inherit from ic_bss. 951 */ 952 ni->ni_authmode = ic->ic_bss->ni_authmode; 953 ni->ni_txpower = ic->ic_bss->ni_txpower; 954 ni->ni_vlan = ic->ic_bss->ni_vlan; /* XXX?? */ 955 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); 956 ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan); 957 ni->ni_rsn = ic->ic_bss->ni_rsn; 958 } else 959 ic->ic_stats.is_rx_nodealloc++; 960 return ni; 961} 962 963static struct ieee80211_node * 964#ifdef IEEE80211_DEBUG_REFCNT 965_ieee80211_find_node_debug(struct ieee80211_node_table *nt, 966 const u_int8_t *macaddr, const char *func, int line) 967#else 968_ieee80211_find_node(struct ieee80211_node_table *nt, 969 const u_int8_t *macaddr) 970#endif 971{ 972 struct ieee80211_node *ni; 973 int hash; 974 975 IEEE80211_NODE_LOCK_ASSERT(nt); 976 977 hash = IEEE80211_NODE_HASH(macaddr); 978 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 979 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) { 980 ieee80211_ref_node(ni); /* mark referenced */ 981#ifdef IEEE80211_DEBUG_REFCNT 982 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 983 "%s (%s:%u) %p<%s> refcnt %d\n", __func__, 984 func, line, 985 ni, ether_sprintf(ni->ni_macaddr), 986 ieee80211_node_refcnt(ni)); 987#endif 988 return ni; 989 } 990 } 991 return NULL; 992} 993#ifdef IEEE80211_DEBUG_REFCNT 994#define _ieee80211_find_node(nt, mac) \ 995 _ieee80211_find_node_debug(nt, mac, func, line) 996#endif 997 998struct ieee80211_node * 999#ifdef IEEE80211_DEBUG_REFCNT 1000ieee80211_find_node_debug(struct ieee80211_node_table *nt, 1001 const u_int8_t *macaddr, const char *func, int line) 1002#else 1003ieee80211_find_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) 1004#endif 1005{ 1006 struct ieee80211_node *ni; 1007 1008 IEEE80211_NODE_LOCK(nt); 1009 ni = _ieee80211_find_node(nt, macaddr); 1010 IEEE80211_NODE_UNLOCK(nt); 1011 return ni; 1012} 1013 1014/* 1015 * Fake up a node; this handles node discovery in adhoc mode. 1016 * Note that for the driver's benefit we we treat this like 1017 * an association so the driver has an opportunity to setup 1018 * it's private state. 1019 */ 1020struct ieee80211_node * 1021ieee80211_fakeup_adhoc_node(struct ieee80211_node_table *nt, 1022 const u_int8_t macaddr[IEEE80211_ADDR_LEN]) 1023{ 1024 struct ieee80211com *ic = nt->nt_ic; 1025 struct ieee80211_node *ni; 1026 1027 ni = ieee80211_dup_bss(nt, macaddr); 1028 if (ni != NULL) { 1029 /* XXX no rate negotiation; just dup */ 1030 ni->ni_rates = ic->ic_bss->ni_rates; 1031 if (ic->ic_newassoc != NULL) 1032 ic->ic_newassoc(ic, ni, 1); 1033 /* XXX not right for 802.1x/WPA */ 1034 ieee80211_node_authorize(ic, ni); 1035 } 1036 return ni; 1037} 1038 1039/* 1040 * Locate the node for sender, track state, and then pass the 1041 * (referenced) node up to the 802.11 layer for its use. We 1042 * are required to pass some node so we fall back to ic_bss 1043 * when this frame is from an unknown sender. The 802.11 layer 1044 * knows this means the sender wasn't in the node table and 1045 * acts accordingly. 1046 */ 1047struct ieee80211_node * 1048#ifdef IEEE80211_DEBUG_REFCNT 1049ieee80211_find_rxnode_debug(struct ieee80211com *ic, 1050 const struct ieee80211_frame_min *wh, const char *func, int line) 1051#else 1052ieee80211_find_rxnode(struct ieee80211com *ic, 1053 const struct ieee80211_frame_min *wh) 1054#endif 1055{ 1056#define IS_CTL(wh) \ 1057 ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL) 1058#define IS_PSPOLL(wh) \ 1059 ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) 1060 struct ieee80211_node_table *nt; 1061 struct ieee80211_node *ni; 1062 1063 /* XXX may want scanned nodes in the neighbor table for adhoc */ 1064 if (ic->ic_opmode == IEEE80211_M_STA || 1065 ic->ic_opmode == IEEE80211_M_MONITOR || 1066 (ic->ic_flags & IEEE80211_F_SCAN)) 1067 nt = &ic->ic_scan; 1068 else 1069 nt = &ic->ic_sta; 1070 /* XXX check ic_bss first in station mode */ 1071 /* XXX 4-address frames? */ 1072 IEEE80211_NODE_LOCK(nt); 1073 if (IS_CTL(wh) && !IS_PSPOLL(wh) /*&& !IS_RTS(ah)*/) 1074 ni = _ieee80211_find_node(nt, wh->i_addr1); 1075 else 1076 ni = _ieee80211_find_node(nt, wh->i_addr2); 1077 IEEE80211_NODE_UNLOCK(nt); 1078 1079 return (ni != NULL ? ni : ieee80211_ref_node(ic->ic_bss)); 1080#undef IS_PSPOLL 1081#undef IS_CTL 1082} 1083 1084/* 1085 * Return a reference to the appropriate node for sending 1086 * a data frame. This handles node discovery in adhoc networks. 1087 */ 1088struct ieee80211_node * 1089#ifdef IEEE80211_DEBUG_REFCNT 1090ieee80211_find_txnode_debug(struct ieee80211com *ic, const u_int8_t *macaddr, 1091 const char *func, int line) 1092#else 1093ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr) 1094#endif 1095{ 1096 struct ieee80211_node_table *nt = &ic->ic_sta; 1097 struct ieee80211_node *ni; 1098 1099 /* 1100 * The destination address should be in the node table 1101 * unless we are operating in station mode or this is a 1102 * multicast/broadcast frame. 1103 */ 1104 if (ic->ic_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(macaddr)) 1105 return ieee80211_ref_node(ic->ic_bss); 1106 1107 /* XXX can't hold lock across dup_bss 'cuz of recursive locking */ 1108 IEEE80211_NODE_LOCK(nt); 1109 ni = _ieee80211_find_node(nt, macaddr); 1110 IEEE80211_NODE_UNLOCK(nt); 1111 1112 if (ni == NULL) { 1113 if (ic->ic_opmode == IEEE80211_M_IBSS || 1114 ic->ic_opmode == IEEE80211_M_AHDEMO) { 1115 /* 1116 * In adhoc mode cons up a node for the destination. 1117 * Note that we need an additional reference for the 1118 * caller to be consistent with _ieee80211_find_node. 1119 */ 1120 ni = ieee80211_fakeup_adhoc_node(nt, macaddr); 1121 if (ni != NULL) 1122 (void) ieee80211_ref_node(ni); 1123 } else { 1124 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 1125 "[%s] no node, discard frame (%s)\n", 1126 ether_sprintf(macaddr), __func__); 1127 ic->ic_stats.is_tx_nonode++; 1128 } 1129 } 1130 return ni; 1131} 1132 1133/* 1134 * Like find but search based on the channel too. 1135 */ 1136struct ieee80211_node * 1137#ifdef IEEE80211_DEBUG_REFCNT 1138ieee80211_find_node_with_channel_debug(struct ieee80211_node_table *nt, 1139 const u_int8_t *macaddr, struct ieee80211_channel *chan, 1140 const char *func, int line) 1141#else 1142ieee80211_find_node_with_channel(struct ieee80211_node_table *nt, 1143 const u_int8_t *macaddr, struct ieee80211_channel *chan) 1144#endif 1145{ 1146 struct ieee80211_node *ni; 1147 int hash; 1148 1149 hash = IEEE80211_NODE_HASH(macaddr); 1150 IEEE80211_NODE_LOCK(nt); 1151 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { 1152 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && 1153 ni->ni_chan == chan) { 1154 ieee80211_ref_node(ni); /* mark referenced */ 1155 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1156#ifdef IEEE80211_DEBUG_REFCNT 1157 "%s (%s:%u) %p<%s> refcnt %d\n", __func__, 1158 func, line, 1159#else 1160 "%s %p<%s> refcnt %d\n", __func__, 1161#endif 1162 ni, 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) %p<%s> refcnt %d\n", __func__, 1198 func, line, 1199#else 1200 "%s %p<%s> refcnt %d\n", __func__, 1201#endif 1202 ni, ether_sprintf(ni->ni_macaddr), 1203 ieee80211_node_refcnt(ni)); 1204 break; 1205 } 1206 } 1207 IEEE80211_NODE_UNLOCK(nt); 1208 return ni; 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 %p<%s> in %s table\n", __func__, ni, 1219 ether_sprintf(ni->ni_macaddr), 1220 nt != NULL ? nt->nt_name : "<gone>"); 1221 1222 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1223 if (nt != NULL) { 1224 TAILQ_REMOVE(&nt->nt_node, ni, ni_list); 1225 LIST_REMOVE(ni, ni_hash); 1226 } 1227 ic->ic_node_free(ni); 1228} 1229 1230void 1231#ifdef IEEE80211_DEBUG_REFCNT 1232ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line) 1233#else 1234ieee80211_free_node(struct ieee80211_node *ni) 1235#endif 1236{ 1237 struct ieee80211_node_table *nt = ni->ni_table; 1238 1239#ifdef IEEE80211_DEBUG_REFCNT 1240 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, 1241 "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni, 1242 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1); 1243#endif 1244 if (ieee80211_node_dectestref(ni)) { 1245 /* 1246 * Beware; if the node is marked gone then it's already 1247 * been removed from the table and we cannot assume the 1248 * table still exists. Regardless, there's no need to lock 1249 * the table. 1250 */ 1251 if (ni->ni_table != NULL) { 1252 IEEE80211_NODE_LOCK(nt); 1253 _ieee80211_free_node(ni); 1254 IEEE80211_NODE_UNLOCK(nt); 1255 } else 1256 _ieee80211_free_node(ni); 1257 } 1258} 1259 1260/* 1261 * Reclaim a node. If this is the last reference count then 1262 * do the normal free work. Otherwise remove it from the node 1263 * table and mark it gone by clearing the back-reference. 1264 */ 1265static void 1266node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni) 1267{ 1268 1269 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, 1270 "%s: remove %p<%s> from %s table, refcnt %d\n", 1271 __func__, ni, ether_sprintf(ni->ni_macaddr), 1272 nt->nt_name, ieee80211_node_refcnt(ni)-1); 1273 if (!ieee80211_node_dectestref(ni)) { 1274 /* 1275 * Other references are present, just remove the 1276 * node from the table so it cannot be found. When 1277 * the references are dropped storage will be 1278 * reclaimed. 1279 */ 1280 TAILQ_REMOVE(&nt->nt_node, ni, ni_list); 1281 LIST_REMOVE(ni, ni_hash); 1282 ni->ni_table = NULL; /* clear reference */ 1283 } else 1284 _ieee80211_free_node(ni); 1285} 1286 1287static void 1288ieee80211_free_allnodes_locked(struct ieee80211_node_table *nt) 1289{ 1290 struct ieee80211com *ic = nt->nt_ic; 1291 struct ieee80211_node *ni; 1292 1293 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1294 "%s: free all nodes in %s table\n", __func__, nt->nt_name); 1295 1296 while ((ni = TAILQ_FIRST(&nt->nt_node)) != NULL) { 1297 if (ni->ni_associd != 0) { 1298 if (ic->ic_auth->ia_node_leave != NULL) 1299 ic->ic_auth->ia_node_leave(ic, ni); 1300 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1301 } 1302 node_reclaim(nt, ni); 1303 } 1304 ieee80211_reset_erp(ic); 1305} 1306 1307static void 1308ieee80211_free_allnodes(struct ieee80211_node_table *nt) 1309{ 1310 1311 IEEE80211_NODE_LOCK(nt); 1312 ieee80211_free_allnodes_locked(nt); 1313 IEEE80211_NODE_UNLOCK(nt); 1314} 1315 1316/* 1317 * Timeout entries in the scan cache. 1318 */ 1319static void 1320ieee80211_timeout_scan_candidates(struct ieee80211_node_table *nt) 1321{ 1322 struct ieee80211com *ic = nt->nt_ic; 1323 struct ieee80211_node *ni, *tni; 1324 1325 IEEE80211_NODE_LOCK(nt); 1326 ni = ic->ic_bss; 1327 /* XXX belongs elsewhere */ 1328 if (ni->ni_rxfrag[0] != NULL && ticks > ni->ni_rxfragstamp + hz) { 1329 m_freem(ni->ni_rxfrag[0]); 1330 ni->ni_rxfrag[0] = NULL; 1331 } 1332 TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, tni) { 1333 if (ni->ni_inact && --ni->ni_inact == 0) { 1334 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1335 "[%s] scan candidate purged from cache " 1336 "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr), 1337 ieee80211_node_refcnt(ni)); 1338 node_reclaim(nt, ni); 1339 } 1340 } 1341 IEEE80211_NODE_UNLOCK(nt); 1342 1343 nt->nt_inact_timer = IEEE80211_INACT_WAIT; 1344} 1345 1346/* 1347 * Timeout inactive stations and do related housekeeping. 1348 * Note that we cannot hold the node lock while sending a 1349 * frame as this would lead to a LOR. Instead we use a 1350 * generation number to mark nodes that we've scanned and 1351 * drop the lock and restart a scan if we have to time out 1352 * a node. Since we are single-threaded by virtue of 1353 * controlling the inactivity timer we can be sure this will 1354 * process each node only once. 1355 */ 1356static void 1357ieee80211_timeout_stations(struct ieee80211_node_table *nt) 1358{ 1359 struct ieee80211com *ic = nt->nt_ic; 1360 struct ieee80211_node *ni; 1361 u_int gen; 1362 1363 IEEE80211_SCAN_LOCK(nt); 1364 gen = nt->nt_scangen++; 1365 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1366 "%s: %s scangen %u\n", __func__, nt->nt_name, gen); 1367restart: 1368 IEEE80211_NODE_LOCK(nt); 1369 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1370 if (ni->ni_scangen == gen) /* previously handled */ 1371 continue; 1372 ni->ni_scangen = gen; 1373 /* 1374 * Free fragment if not needed anymore 1375 * (last fragment older than 1s). 1376 * XXX doesn't belong here 1377 */ 1378 if (ni->ni_rxfrag[0] != NULL && 1379 ticks > ni->ni_rxfragstamp + hz) { 1380 m_freem(ni->ni_rxfrag[0]); 1381 ni->ni_rxfrag[0] = NULL; 1382 } 1383 /* 1384 * Special case ourself; we may be idle for extended periods 1385 * of time and regardless reclaiming our state is wrong. 1386 */ 1387 if (ni == ic->ic_bss) 1388 continue; 1389 ni->ni_inact--; 1390 if (ni->ni_associd != 0) { 1391 /* 1392 * Age frames on the power save queue. The 1393 * aging interval is 4 times the listen 1394 * interval specified by the station. This 1395 * number is factored into the age calculations 1396 * when the frame is placed on the queue. We 1397 * store ages as time differences we can check 1398 * and/or adjust only the head of the list. 1399 */ 1400 if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) { 1401 struct mbuf *m; 1402 int discard = 0; 1403 1404 IEEE80211_NODE_SAVEQ_LOCK(ni); 1405 while (IF_POLL(&ni->ni_savedq, m) != NULL && 1406 M_AGE_GET(m) < IEEE80211_INACT_WAIT) { 1407IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] discard frame, age %u\n", ether_sprintf(ni->ni_macaddr), M_AGE_GET(m));/*XXX*/ 1408 _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m); 1409 m_freem(m); 1410 discard++; 1411 } 1412 if (m != NULL) 1413 M_AGE_SUB(m, IEEE80211_INACT_WAIT); 1414 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1415 1416 if (discard != 0) { 1417 IEEE80211_DPRINTF(ic, 1418 IEEE80211_MSG_POWER, 1419 "[%s] discard %u frames for age\n", 1420 ether_sprintf(ni->ni_macaddr), 1421 discard); 1422 IEEE80211_NODE_STAT_ADD(ni, 1423 ps_discard, discard); 1424 if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) 1425 ic->ic_set_tim(ic, ni, 0); 1426 } 1427 } 1428 /* 1429 * Probe the station before time it out. We 1430 * send a null data frame which may not be 1431 * universally supported by drivers (need it 1432 * for ps-poll support so it should be...). 1433 */ 1434 if (0 < ni->ni_inact && 1435 ni->ni_inact <= ic->ic_inact_probe) { 1436 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1437 "[%s] probe station due to inactivity\n", 1438 ether_sprintf(ni->ni_macaddr)); 1439 IEEE80211_NODE_UNLOCK(nt); 1440 ieee80211_send_nulldata(ic, ni); 1441 /* XXX stat? */ 1442 goto restart; 1443 } 1444 } 1445 if (ni->ni_inact <= 0) { 1446 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1447 "[%s] station timed out due to inactivity " 1448 "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr), 1449 ieee80211_node_refcnt(ni)); 1450 /* 1451 * Send a deauthenticate frame and drop the station. 1452 * This is somewhat complicated due to reference counts 1453 * and locking. At this point a station will typically 1454 * have a reference count of 1. ieee80211_node_leave 1455 * will do a "free" of the node which will drop the 1456 * reference count. But in the meantime a reference 1457 * wil be held by the deauth frame. The actual reclaim 1458 * of the node will happen either after the tx is 1459 * completed or by ieee80211_node_leave. 1460 * 1461 * Separately we must drop the node lock before sending 1462 * in case the driver takes a lock, as this will result 1463 * in LOR between the node lock and the driver lock. 1464 */ 1465 IEEE80211_NODE_UNLOCK(nt); 1466 if (ni->ni_associd != 0) { 1467 IEEE80211_SEND_MGMT(ic, ni, 1468 IEEE80211_FC0_SUBTYPE_DEAUTH, 1469 IEEE80211_REASON_AUTH_EXPIRE); 1470 } 1471 ieee80211_node_leave(ic, ni); 1472 ic->ic_stats.is_node_timeout++; 1473 goto restart; 1474 } 1475 } 1476 IEEE80211_NODE_UNLOCK(nt); 1477 1478 IEEE80211_SCAN_UNLOCK(nt); 1479 1480 nt->nt_inact_timer = IEEE80211_INACT_WAIT; 1481} 1482 1483void 1484ieee80211_iterate_nodes(struct ieee80211_node_table *nt, ieee80211_iter_func *f, void *arg) 1485{ 1486 struct ieee80211_node *ni; 1487 u_int gen; 1488 1489 IEEE80211_SCAN_LOCK(nt); 1490 gen = nt->nt_scangen++; 1491restart: 1492 IEEE80211_NODE_LOCK(nt); 1493 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1494 if (ni->ni_scangen != gen) { 1495 ni->ni_scangen = gen; 1496 (void) ieee80211_ref_node(ni); 1497 IEEE80211_NODE_UNLOCK(nt); 1498 (*f)(arg, ni); 1499 ieee80211_free_node(ni); 1500 goto restart; 1501 } 1502 } 1503 IEEE80211_NODE_UNLOCK(nt); 1504 1505 IEEE80211_SCAN_UNLOCK(nt); 1506} 1507 1508void 1509ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni) 1510{ 1511 printf("0x%p: mac %s refcnt %d\n", ni, 1512 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); 1513 printf("\tscangen %u authmode %u flags 0x%x\n", 1514 ni->ni_scangen, ni->ni_authmode, ni->ni_flags); 1515 printf("\tassocid 0x%x txpower %u vlan %u\n", 1516 ni->ni_associd, ni->ni_txpower, ni->ni_vlan); 1517 printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n", 1518 ni->ni_txseqs[0], 1519 ni->ni_rxseqs[0] >> IEEE80211_SEQ_SEQ_SHIFT, 1520 ni->ni_rxseqs[0] & IEEE80211_SEQ_FRAG_MASK, 1521 ni->ni_rxfragstamp); 1522 printf("\trstamp %u rssi %u intval %u capinfo 0x%x\n", 1523 ni->ni_rstamp, ni->ni_rssi, ni->ni_intval, ni->ni_capinfo); 1524 printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n", 1525 ether_sprintf(ni->ni_bssid), 1526 ni->ni_esslen, ni->ni_essid, 1527 ni->ni_chan->ic_freq, ni->ni_chan->ic_flags); 1528 printf("\tfails %u inact %u txrate %u\n", 1529 ni->ni_fails, ni->ni_inact, ni->ni_txrate); 1530} 1531 1532void 1533ieee80211_dump_nodes(struct ieee80211_node_table *nt) 1534{ 1535 ieee80211_iterate_nodes(nt, 1536 (ieee80211_iter_func *) ieee80211_dump_node, nt); 1537} 1538 1539/* 1540 * Handle a station joining an 11g network. 1541 */ 1542static void 1543ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1544{ 1545 1546 /* 1547 * Station isn't capable of short slot time. Bump 1548 * the count of long slot time stations and disable 1549 * use of short slot time. Note that the actual switch 1550 * over to long slot time use may not occur until the 1551 * next beacon transmission (per sec. 7.3.1.4 of 11g). 1552 */ 1553 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { 1554 ic->ic_longslotsta++; 1555 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1556 "[%s] station needs long slot time, count %d\n", 1557 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); 1558 /* XXX vap's w/ conflicting needs won't work */ 1559 ieee80211_set_shortslottime(ic, 0); 1560 } 1561 /* 1562 * If the new station is not an ERP station 1563 * then bump the counter and enable protection 1564 * if configured. 1565 */ 1566 if (!ieee80211_iserp_rateset(ic, &ni->ni_rates)) { 1567 ic->ic_nonerpsta++; 1568 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1569 "[%s] station is !ERP, %d non-ERP stations associated\n", 1570 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); 1571 /* 1572 * If protection is configured, enable it. 1573 */ 1574 if (ic->ic_protmode != IEEE80211_PROT_NONE) { 1575 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1576 "%s: enable use of protection\n", __func__); 1577 ic->ic_flags |= IEEE80211_F_USEPROT; 1578 } 1579 /* 1580 * If station does not support short preamble 1581 * then we must enable use of Barker preamble. 1582 */ 1583 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) { 1584 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1585 "[%s] station needs long preamble\n", 1586 ether_sprintf(ni->ni_macaddr)); 1587 ic->ic_flags |= IEEE80211_F_USEBARKER; 1588 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1589 } 1590 } else 1591 ni->ni_flags |= IEEE80211_NODE_ERP; 1592} 1593 1594void 1595ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int resp) 1596{ 1597 int newassoc; 1598 1599 if (ni->ni_associd == 0) { 1600 u_int16_t aid; 1601 1602 /* 1603 * It would be good to search the bitmap 1604 * more efficiently, but this will do for now. 1605 */ 1606 for (aid = 1; aid < ic->ic_max_aid; aid++) { 1607 if (!IEEE80211_AID_ISSET(aid, 1608 ic->ic_aid_bitmap)) 1609 break; 1610 } 1611 if (aid >= ic->ic_max_aid) { 1612 IEEE80211_SEND_MGMT(ic, ni, resp, 1613 IEEE80211_REASON_ASSOC_TOOMANY); 1614 ieee80211_node_leave(ic, ni); 1615 return; 1616 } 1617 ni->ni_associd = aid | 0xc000; 1618 IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap); 1619 ic->ic_sta_assoc++; 1620 newassoc = 1; 1621 if (ic->ic_curmode == IEEE80211_MODE_11G || 1622 ic->ic_curmode == IEEE80211_MODE_TURBO_G) 1623 ieee80211_node_join_11g(ic, ni); 1624 } else 1625 newassoc = 0; 1626 1627 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, 1628 "[%s] station %sassociated at aid %d: %s preamble, %s slot time%s%s\n", 1629 ether_sprintf(ni->ni_macaddr), newassoc ? "" : "re", 1630 IEEE80211_NODE_AID(ni), 1631 ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long", 1632 ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long", 1633 ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "", 1634 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "" 1635 ); 1636 1637 /* give driver a chance to setup state like ni_txrate */ 1638 if (ic->ic_newassoc != NULL) 1639 ic->ic_newassoc(ic, ni, newassoc); 1640 ni->ni_inact_reload = ic->ic_inact_auth; 1641 ni->ni_inact = ni->ni_inact_reload; 1642 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS); 1643 /* tell the authenticator about new station */ 1644 if (ic->ic_auth->ia_node_join != NULL) 1645 ic->ic_auth->ia_node_join(ic, ni); 1646 ieee80211_notify_node_join(ic, ni, newassoc); 1647} 1648 1649/* 1650 * Handle a station leaving an 11g network. 1651 */ 1652static void 1653ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni) 1654{ 1655 1656 KASSERT(ic->ic_curmode == IEEE80211_MODE_11G || 1657 ic->ic_curmode == IEEE80211_MODE_TURBO_G, 1658 ("not in 11g, curmode %x", ic->ic_curmode)); 1659 1660 /* 1661 * If a long slot station do the slot time bookkeeping. 1662 */ 1663 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { 1664 KASSERT(ic->ic_longslotsta > 0, 1665 ("bogus long slot station count %d", ic->ic_longslotsta)); 1666 ic->ic_longslotsta--; 1667 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1668 "[%s] long slot time station leaves, count now %d\n", 1669 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); 1670 if (ic->ic_longslotsta == 0) { 1671 /* 1672 * Re-enable use of short slot time if supported 1673 * and not operating in IBSS mode (per spec). 1674 */ 1675 if ((ic->ic_caps & IEEE80211_C_SHSLOT) && 1676 ic->ic_opmode != IEEE80211_M_IBSS) { 1677 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1678 "%s: re-enable use of short slot time\n", 1679 __func__); 1680 ieee80211_set_shortslottime(ic, 1); 1681 } 1682 } 1683 } 1684 /* 1685 * If a non-ERP station do the protection-related bookkeeping. 1686 */ 1687 if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) { 1688 KASSERT(ic->ic_nonerpsta > 0, 1689 ("bogus non-ERP station count %d", ic->ic_nonerpsta)); 1690 ic->ic_nonerpsta--; 1691 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1692 "[%s] non-ERP station leaves, count now %d\n", 1693 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); 1694 if (ic->ic_nonerpsta == 0) { 1695 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1696 "%s: disable use of protection\n", __func__); 1697 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1698 /* XXX verify mode? */ 1699 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) { 1700 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1701 "%s: re-enable use of short preamble\n", 1702 __func__); 1703 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1704 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1705 } 1706 } 1707 } 1708} 1709 1710/* 1711 * Handle bookkeeping for station deauthentication/disassociation 1712 * when operating as an ap. 1713 */ 1714void 1715ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 1716{ 1717 struct ieee80211_node_table *nt = ni->ni_table; 1718 1719 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, 1720 "[%s] station with aid %d leaves\n", 1721 ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_AID(ni)); 1722 1723 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || 1724 ic->ic_opmode == IEEE80211_M_IBSS || 1725 ic->ic_opmode == IEEE80211_M_AHDEMO, 1726 ("unexpected operating mode %u", ic->ic_opmode)); 1727 /* 1728 * If node wasn't previously associated all 1729 * we need to do is reclaim the reference. 1730 */ 1731 /* XXX ibss mode bypasses 11g and notification */ 1732 if (ni->ni_associd == 0) 1733 goto done; 1734 /* 1735 * Tell the authenticator the station is leaving. 1736 * Note that we must do this before yanking the 1737 * association id as the authenticator uses the 1738 * associd to locate it's state block. 1739 */ 1740 if (ic->ic_auth->ia_node_leave != NULL) 1741 ic->ic_auth->ia_node_leave(ic, ni); 1742 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); 1743 ni->ni_associd = 0; 1744 ic->ic_sta_assoc--; 1745 1746 if (ic->ic_curmode == IEEE80211_MODE_11G || 1747 ic->ic_curmode == IEEE80211_MODE_TURBO_G) 1748 ieee80211_node_leave_11g(ic, ni); 1749 /* 1750 * Cleanup station state. In particular clear various 1751 * state that might otherwise be reused if the node 1752 * is reused before the reference count goes to zero 1753 * (and memory is reclaimed). 1754 */ 1755 ieee80211_sta_leave(ic, ni); 1756done: 1757 /* 1758 * Remove the node from any table it's recorded in and 1759 * drop the caller's reference. Removal from the table 1760 * is important to insure the node is not reprocessed 1761 * for inactivity. 1762 */ 1763 if (nt != NULL) { 1764 IEEE80211_NODE_LOCK(nt); 1765 node_reclaim(nt, ni); 1766 IEEE80211_NODE_UNLOCK(nt); 1767 } else 1768 ieee80211_free_node(ni); 1769} 1770 1771u_int8_t 1772ieee80211_getrssi(struct ieee80211com *ic) 1773{ 1774#define NZ(x) ((x) == 0 ? 1 : (x)) 1775 struct ieee80211_node_table *nt = &ic->ic_sta; 1776 u_int32_t rssi_samples, rssi_total; 1777 struct ieee80211_node *ni; 1778 1779 rssi_total = 0; 1780 rssi_samples = 0; 1781 switch (ic->ic_opmode) { 1782 case IEEE80211_M_IBSS: /* average of all ibss neighbors */ 1783 /* XXX locking */ 1784 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) 1785 if (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) { 1786 rssi_samples++; 1787 rssi_total += ic->ic_node_getrssi(ni); 1788 } 1789 break; 1790 case IEEE80211_M_AHDEMO: /* average of all neighbors */ 1791 /* XXX locking */ 1792 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { 1793 rssi_samples++; 1794 rssi_total += ic->ic_node_getrssi(ni); 1795 } 1796 break; 1797 case IEEE80211_M_HOSTAP: /* average of all associated stations */ 1798 /* XXX locking */ 1799 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) 1800 if (IEEE80211_AID(ni->ni_associd) != 0) { 1801 rssi_samples++; 1802 rssi_total += ic->ic_node_getrssi(ni); 1803 } 1804 break; 1805 case IEEE80211_M_MONITOR: /* XXX */ 1806 case IEEE80211_M_STA: /* use stats from associated ap */ 1807 default: 1808 if (ic->ic_bss != NULL) 1809 rssi_total = ic->ic_node_getrssi(ic->ic_bss); 1810 rssi_samples = 1; 1811 break; 1812 } 1813 return rssi_total / NZ(rssi_samples); 1814#undef NZ 1815} 1816 1817/* 1818 * Indicate whether there are frames queued for a station in power-save mode. 1819 */ 1820static void 1821ieee80211_set_tim(struct ieee80211com *ic, struct ieee80211_node *ni, int set) 1822{ 1823 u_int16_t aid; 1824 1825 KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || 1826 ic->ic_opmode == IEEE80211_M_IBSS, 1827 ("operating mode %u", ic->ic_opmode)); 1828 1829 aid = IEEE80211_AID(ni->ni_associd); 1830 KASSERT(aid < ic->ic_max_aid, 1831 ("bogus aid %u, max %u", aid, ic->ic_max_aid)); 1832 1833 IEEE80211_BEACON_LOCK(ic); 1834 if (set != (isset(ic->ic_tim_bitmap, aid) != 0)) { 1835 if (set) { 1836 setbit(ic->ic_tim_bitmap, aid); 1837 ic->ic_ps_pending++; 1838 } else { 1839 clrbit(ic->ic_tim_bitmap, aid); 1840 ic->ic_ps_pending--; 1841 } 1842 ic->ic_flags |= IEEE80211_F_TIMUPDATE; 1843 } 1844 IEEE80211_BEACON_UNLOCK(ic); 1845} 1846 1847/* 1848 * Node table support. 1849 */ 1850 1851static void 1852ieee80211_node_table_init(struct ieee80211com *ic, 1853 struct ieee80211_node_table *nt, 1854 const char *name, int inact, 1855 void (*timeout)(struct ieee80211_node_table *)) 1856{ 1857 1858 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1859 "%s %s table, inact %u\n", __func__, name, inact); 1860 1861 nt->nt_ic = ic; 1862 /* XXX need unit */ 1863 IEEE80211_NODE_LOCK_INIT(nt, ic->ic_ifp->if_xname); 1864 IEEE80211_SCAN_LOCK_INIT(nt, ic->ic_ifp->if_xname); 1865 TAILQ_INIT(&nt->nt_node); 1866 nt->nt_name = name; 1867 nt->nt_scangen = 1; 1868 nt->nt_inact_init = inact; 1869 nt->nt_timeout = timeout; 1870} 1871 1872void 1873ieee80211_node_table_reset(struct ieee80211_node_table *nt) 1874{ 1875 1876 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1877 "%s %s table\n", __func__, nt->nt_name); 1878 1879 IEEE80211_NODE_LOCK(nt); 1880 nt->nt_inact_timer = 0; 1881 ieee80211_free_allnodes_locked(nt); 1882 IEEE80211_NODE_UNLOCK(nt); 1883} 1884 1885static void 1886ieee80211_node_table_cleanup(struct ieee80211_node_table *nt) 1887{ 1888 1889 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, 1890 "%s %s table\n", __func__, nt->nt_name); 1891 1892 ieee80211_free_allnodes_locked(nt); 1893 IEEE80211_SCAN_LOCK_DESTROY(nt); 1894 IEEE80211_NODE_LOCK_DESTROY(nt); 1895} 1896