ieee80211_scan_sta.c revision 189377
1251652Sgjb/*- 2251652Sgjb * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 3251652Sgjb * All rights reserved. 4251652Sgjb * 5251652Sgjb * Redistribution and use in source and binary forms, with or without 6251652Sgjb * modification, are permitted provided that the following conditions 7251652Sgjb * are met: 8251652Sgjb * 1. Redistributions of source code must retain the above copyright 9251652Sgjb * notice, this list of conditions and the following disclaimer. 10262762Sgjb * 2. Redistributions in binary form must reproduce the above copyright 11251652Sgjb * notice, this list of conditions and the following disclaimer in the 12251652Sgjb * documentation and/or other materials provided with the distribution. 13260072Sgjb * 14260072Sgjb * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15260072Sgjb * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16251652Sgjb * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17253019Sgjb * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18253019Sgjb * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19253019Sgjb * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20262762Sgjb * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21262762Sgjb * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22262762Sgjb * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23262762Sgjb * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24262762Sgjb */ 25262762Sgjb 26262762Sgjb#include <sys/cdefs.h> 27251652Sgjb__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_scan_sta.c 189377 2009-03-04 22:05:25Z sam $"); 28251652Sgjb 29251652Sgjb/* 30251652Sgjb * IEEE 802.11 station scanning support. 31253019Sgjb */ 32253019Sgjb#include "opt_wlan.h" 33251652Sgjb 34251652Sgjb#include <sys/param.h> 35251652Sgjb#include <sys/systm.h> 36251652Sgjb#include <sys/kernel.h> 37251652Sgjb#include <sys/module.h> 38251652Sgjb 39251652Sgjb#include <sys/socket.h> 40251652Sgjb 41251652Sgjb#include <net/if.h> 42251652Sgjb#include <net/if_media.h> 43262794Sgjb#include <net/ethernet.h> 44251652Sgjb 45251652Sgjb#include <net80211/ieee80211_var.h> 46251652Sgjb#include <net80211/ieee80211_input.h> 47251652Sgjb#include <net80211/ieee80211_regdomain.h> 48259530Sgjb#ifdef IEEE80211_SUPPORT_TDMA 49264246Sgjb#include <net80211/ieee80211_tdma.h> 50264141Sgjb#endif 51264141Sgjb 52264141Sgjb#include <net/bpf.h> 53264141Sgjb 54264141Sgjb/* 55264141Sgjb * Parameters for managing cache entries: 56264141Sgjb * 57264141Sgjb * o a station with STA_FAILS_MAX failures is not considered 58264141Sgjb * when picking a candidate 59264441Sgjb * o a station that hasn't had an update in STA_PURGE_SCANS 60264441Sgjb * (background) scans is discarded 61264441Sgjb * o after STA_FAILS_AGE seconds we clear the failure count 62264441Sgjb */ 63264441Sgjb#define STA_FAILS_MAX 2 /* assoc failures before ignored */ 64264441Sgjb#define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */ 65264441Sgjb#define STA_PURGE_SCANS 2 /* age for purging entries (scans) */ 66264441Sgjb 67264441Sgjb/* XXX tunable */ 68264441Sgjb#define STA_RSSI_MIN 8 /* min acceptable rssi */ 69264441Sgjb#define STA_RSSI_MAX 40 /* max rssi for comparison */ 70264441Sgjb 71264141Sgjbstruct sta_entry { 72264141Sgjb struct ieee80211_scan_entry base; 73264141Sgjb TAILQ_ENTRY(sta_entry) se_list; 74264141Sgjb LIST_ENTRY(sta_entry) se_hash; 75 uint8_t se_fails; /* failure to associate count */ 76 uint8_t se_seen; /* seen during current scan */ 77 uint8_t se_notseen; /* not seen in previous scans */ 78 uint8_t se_flags; 79#define STA_DEMOTE11B 0x01 /* match w/ demoted 11b chan */ 80 uint32_t se_avgrssi; /* LPF rssi state */ 81 unsigned long se_lastupdate; /* time of last update */ 82 unsigned long se_lastfail; /* time of last failure */ 83 unsigned long se_lastassoc; /* time of last association */ 84 u_int se_scangen; /* iterator scan gen# */ 85 u_int se_countrygen; /* gen# of last cc notify */ 86}; 87 88#define STA_HASHSIZE 32 89/* simple hash is enough for variation of macaddr */ 90#define STA_HASH(addr) \ 91 (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE) 92 93#define MAX_IEEE_CHAN 256 /* max acceptable IEEE chan # */ 94CTASSERT(MAX_IEEE_CHAN >= 256); 95 96struct sta_table { 97 struct mtx st_lock; /* on scan table */ 98 TAILQ_HEAD(, sta_entry) st_entry; /* all entries */ 99 LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE]; 100 struct mtx st_scanlock; /* on st_scaniter */ 101 u_int st_scaniter; /* gen# for iterator */ 102 u_int st_scangen; /* scan generation # */ 103 int st_newscan; 104 /* ap-related state */ 105 int st_maxrssi[MAX_IEEE_CHAN]; 106}; 107 108static void sta_flush_table(struct sta_table *); 109/* 110 * match_bss returns a bitmask describing if an entry is suitable 111 * for use. If non-zero the entry was deemed not suitable and it's 112 * contents explains why. The following flags are or'd to to this 113 * mask and can be used to figure out why the entry was rejected. 114 */ 115#define MATCH_CHANNEL 0x0001 /* channel mismatch */ 116#define MATCH_CAPINFO 0x0002 /* capabilities mismatch, e.g. no ess */ 117#define MATCH_PRIVACY 0x0004 /* privacy mismatch */ 118#define MATCH_RATE 0x0008 /* rate set mismatch */ 119#define MATCH_SSID 0x0010 /* ssid mismatch */ 120#define MATCH_BSSID 0x0020 /* bssid mismatch */ 121#define MATCH_FAILS 0x0040 /* too many failed auth attempts */ 122#define MATCH_NOTSEEN 0x0080 /* not seen in recent scans */ 123#define MATCH_RSSI 0x0100 /* rssi deemed too low to use */ 124#define MATCH_CC 0x0200 /* country code mismatch */ 125#define MATCH_TDMA_NOIE 0x0400 /* no TDMA ie */ 126#define MATCH_TDMA_NOTMASTER 0x0800 /* not TDMA master */ 127#define MATCH_TDMA_NOSLOT 0x1000 /* all TDMA slots occupied */ 128#define MATCH_TDMA_LOCAL 0x2000 /* local address */ 129static int match_bss(struct ieee80211vap *, 130 const struct ieee80211_scan_state *, struct sta_entry *, int); 131static void adhoc_age(struct ieee80211_scan_state *); 132 133static __inline int 134isocmp(const uint8_t cc1[], const uint8_t cc2[]) 135{ 136 return (cc1[0] == cc2[0] && cc1[1] == cc2[1]); 137} 138 139/* number of references from net80211 layer */ 140static int nrefs = 0; 141 142/* 143 * Attach prior to any scanning work. 144 */ 145static int 146sta_attach(struct ieee80211_scan_state *ss) 147{ 148 struct sta_table *st; 149 150 st = (struct sta_table *) malloc(sizeof(struct sta_table), 151 M_80211_SCAN, M_NOWAIT | M_ZERO); 152 if (st == NULL) 153 return 0; 154 mtx_init(&st->st_lock, "scantable", "802.11 scan table", MTX_DEF); 155 mtx_init(&st->st_scanlock, "scangen", "802.11 scangen", MTX_DEF); 156 TAILQ_INIT(&st->st_entry); 157 ss->ss_priv = st; 158 nrefs++; /* NB: we assume caller locking */ 159 return 1; 160} 161 162/* 163 * Cleanup any private state. 164 */ 165static int 166sta_detach(struct ieee80211_scan_state *ss) 167{ 168 struct sta_table *st = ss->ss_priv; 169 170 if (st != NULL) { 171 sta_flush_table(st); 172 mtx_destroy(&st->st_lock); 173 mtx_destroy(&st->st_scanlock); 174 free(st, M_80211_SCAN); 175 KASSERT(nrefs > 0, ("imbalanced attach/detach")); 176 nrefs--; /* NB: we assume caller locking */ 177 } 178 return 1; 179} 180 181/* 182 * Flush all per-scan state. 183 */ 184static int 185sta_flush(struct ieee80211_scan_state *ss) 186{ 187 struct sta_table *st = ss->ss_priv; 188 189 mtx_lock(&st->st_lock); 190 sta_flush_table(st); 191 mtx_unlock(&st->st_lock); 192 ss->ss_last = 0; 193 return 0; 194} 195 196/* 197 * Flush all entries in the scan cache. 198 */ 199static void 200sta_flush_table(struct sta_table *st) 201{ 202 struct sta_entry *se, *next; 203 204 TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 205 TAILQ_REMOVE(&st->st_entry, se, se_list); 206 LIST_REMOVE(se, se_hash); 207 ieee80211_ies_cleanup(&se->base.se_ies); 208 free(se, M_80211_SCAN); 209 } 210 memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi)); 211} 212 213/* 214 * Process a beacon or probe response frame; create an 215 * entry in the scan cache or update any previous entry. 216 */ 217static int 218sta_add(struct ieee80211_scan_state *ss, 219 const struct ieee80211_scanparams *sp, 220 const struct ieee80211_frame *wh, 221 int subtype, int rssi, int noise, int rstamp) 222{ 223#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 224#define PICK1ST(_ss) \ 225 ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \ 226 IEEE80211_SCAN_PICK1ST) 227 struct sta_table *st = ss->ss_priv; 228 const uint8_t *macaddr = wh->i_addr2; 229 struct ieee80211vap *vap = ss->ss_vap; 230 struct ieee80211com *ic = vap->iv_ic; 231 struct sta_entry *se; 232 struct ieee80211_scan_entry *ise; 233 int hash; 234 235 hash = STA_HASH(macaddr); 236 237 mtx_lock(&st->st_lock); 238 LIST_FOREACH(se, &st->st_hash[hash], se_hash) 239 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 240 goto found; 241 se = (struct sta_entry *) malloc(sizeof(struct sta_entry), 242 M_80211_SCAN, M_NOWAIT | M_ZERO); 243 if (se == NULL) { 244 mtx_unlock(&st->st_lock); 245 return 0; 246 } 247 se->se_scangen = st->st_scaniter-1; 248 se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER; 249 IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr); 250 TAILQ_INSERT_TAIL(&st->st_entry, se, se_list); 251 LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash); 252found: 253 ise = &se->base; 254 /* XXX ap beaconing multiple ssid w/ same bssid */ 255 if (sp->ssid[1] != 0 && 256 (ISPROBE(subtype) || ise->se_ssid[1] == 0)) 257 memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]); 258 KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE, 259 ("rate set too large: %u", sp->rates[1])); 260 memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]); 261 if (sp->xrates != NULL) { 262 /* XXX validate xrates[1] */ 263 KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE, 264 ("xrate set too large: %u", sp->xrates[1])); 265 memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]); 266 } else 267 ise->se_xrates[1] = 0; 268 IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3); 269 if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) { 270 /* 271 * Record rssi data using extended precision LPF filter. 272 * 273 * NB: use only on-channel data to insure we get a good 274 * estimate of the signal we'll see when associated. 275 */ 276 IEEE80211_RSSI_LPF(se->se_avgrssi, rssi); 277 ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi); 278 ise->se_noise = noise; 279 } 280 ise->se_rstamp = rstamp; 281 memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp)); 282 ise->se_intval = sp->bintval; 283 ise->se_capinfo = sp->capinfo; 284 /* 285 * Beware of overriding se_chan for frames seen 286 * off-channel; this can cause us to attempt an 287 * association on the wrong channel. 288 */ 289 if (sp->status & IEEE80211_BPARSE_OFFCHAN) { 290 struct ieee80211_channel *c; 291 /* 292 * Off-channel, locate the home/bss channel for the sta 293 * using the value broadcast in the DSPARMS ie. We know 294 * sp->chan has this value because it's used to calculate 295 * IEEE80211_BPARSE_OFFCHAN. 296 */ 297 c = ieee80211_find_channel_byieee(ic, sp->chan, 298 ic->ic_curchan->ic_flags); 299 if (c != NULL) { 300 ise->se_chan = c; 301 } else if (ise->se_chan == NULL) { 302 /* should not happen, pick something */ 303 ise->se_chan = ic->ic_curchan; 304 } 305 } else 306 ise->se_chan = ic->ic_curchan; 307 ise->se_fhdwell = sp->fhdwell; 308 ise->se_fhindex = sp->fhindex; 309 ise->se_erp = sp->erp; 310 ise->se_timoff = sp->timoff; 311 if (sp->tim != NULL) { 312 const struct ieee80211_tim_ie *tim = 313 (const struct ieee80211_tim_ie *) sp->tim; 314 ise->se_dtimperiod = tim->tim_period; 315 } 316 if (sp->country != NULL) { 317 const struct ieee80211_country_ie *cie = 318 (const struct ieee80211_country_ie *) sp->country; 319 /* 320 * If 11d is enabled and we're attempting to join a bss 321 * that advertises it's country code then compare our 322 * current settings to what we fetched from the country ie. 323 * If our country code is unspecified or different then 324 * dispatch an event to user space that identifies the 325 * country code so our regdomain config can be changed. 326 */ 327 /* XXX only for STA mode? */ 328 if ((IEEE80211_IS_CHAN_11D(ise->se_chan) || 329 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 330 (ic->ic_regdomain.country == CTRY_DEFAULT || 331 !isocmp(cie->cc, ic->ic_regdomain.isocc))) { 332 /* only issue one notify event per scan */ 333 if (se->se_countrygen != st->st_scangen) { 334 ieee80211_notify_country(vap, ise->se_bssid, 335 cie->cc); 336 se->se_countrygen = st->st_scangen; 337 } 338 } 339 ise->se_cc[0] = cie->cc[0]; 340 ise->se_cc[1] = cie->cc[1]; 341 } 342 /* NB: no need to setup ie ptrs; they are not (currently) used */ 343 (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len); 344 345 /* clear failure count after STA_FAIL_AGE passes */ 346 if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) { 347 se->se_fails = 0; 348 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr, 349 "%s: fails %u", __func__, se->se_fails); 350 } 351 352 se->se_lastupdate = ticks; /* update time */ 353 se->se_seen = 1; 354 se->se_notseen = 0; 355 356 KASSERT(sizeof(sp->bchan) == 1, ("bchan size")); 357 if (rssi > st->st_maxrssi[sp->bchan]) 358 st->st_maxrssi[sp->bchan] = rssi; 359 360 mtx_unlock(&st->st_lock); 361 362 /* 363 * If looking for a quick choice and nothing's 364 * been found check here. 365 */ 366 if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0) 367 ss->ss_flags |= IEEE80211_SCAN_GOTPICK; 368 369 return 1; 370#undef PICK1ST 371#undef ISPROBE 372} 373 374/* 375 * Check if a channel is excluded by user request. 376 */ 377static int 378isexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c) 379{ 380 return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) || 381 (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 382 c->ic_freq != vap->iv_des_chan->ic_freq)); 383} 384 385static struct ieee80211_channel * 386find11gchannel(struct ieee80211com *ic, int i, int freq) 387{ 388 struct ieee80211_channel *c; 389 int j; 390 391 /* 392 * The normal ordering in the channel list is b channel 393 * immediately followed by g so optimize the search for 394 * this. We'll still do a full search just in case. 395 */ 396 for (j = i+1; j < ic->ic_nchans; j++) { 397 c = &ic->ic_channels[j]; 398 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 399 return c; 400 } 401 for (j = 0; j < i; j++) { 402 c = &ic->ic_channels[j]; 403 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 404 return c; 405 } 406 return NULL; 407} 408 409static const u_int chanflags[IEEE80211_MODE_MAX] = { 410 [IEEE80211_MODE_AUTO] = IEEE80211_CHAN_B, 411 [IEEE80211_MODE_11A] = IEEE80211_CHAN_A, 412 [IEEE80211_MODE_11B] = IEEE80211_CHAN_B, 413 [IEEE80211_MODE_11G] = IEEE80211_CHAN_G, 414 [IEEE80211_MODE_FH] = IEEE80211_CHAN_FHSS, 415 /* check base channel */ 416 [IEEE80211_MODE_TURBO_A] = IEEE80211_CHAN_A, 417 [IEEE80211_MODE_TURBO_G] = IEEE80211_CHAN_G, 418 [IEEE80211_MODE_STURBO_A] = IEEE80211_CHAN_ST, 419 [IEEE80211_MODE_HALF] = IEEE80211_CHAN_HALF, 420 [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_QUARTER, 421 /* check legacy */ 422 [IEEE80211_MODE_11NA] = IEEE80211_CHAN_A, 423 [IEEE80211_MODE_11NG] = IEEE80211_CHAN_G, 424}; 425 426static void 427add_channels(struct ieee80211vap *vap, 428 struct ieee80211_scan_state *ss, 429 enum ieee80211_phymode mode, const uint16_t freq[], int nfreq) 430{ 431#define N(a) (sizeof(a) / sizeof(a[0])) 432 struct ieee80211com *ic = vap->iv_ic; 433 struct ieee80211_channel *c, *cg; 434 u_int modeflags; 435 int i; 436 437 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 438 modeflags = chanflags[mode]; 439 for (i = 0; i < nfreq; i++) { 440 if (ss->ss_last >= IEEE80211_SCAN_MAX) 441 break; 442 443 c = ieee80211_find_channel(ic, freq[i], modeflags); 444 if (c == NULL || isexcluded(vap, c)) 445 continue; 446 if (mode == IEEE80211_MODE_AUTO) { 447 /* 448 * XXX special-case 11b/g channels so we select 449 * the g channel if both are present. 450 */ 451 if (IEEE80211_IS_CHAN_B(c) && 452 (cg = find11gchannel(ic, i, c->ic_freq)) != NULL) 453 c = cg; 454 } 455 ss->ss_chans[ss->ss_last++] = c; 456 } 457#undef N 458} 459 460struct scanlist { 461 uint16_t mode; 462 uint16_t count; 463 const uint16_t *list; 464}; 465 466static int 467checktable(const struct scanlist *scan, const struct ieee80211_channel *c) 468{ 469 int i; 470 471 for (; scan->list != NULL; scan++) { 472 for (i = 0; i < scan->count; i++) 473 if (scan->list[i] == c->ic_freq) 474 return 1; 475 } 476 return 0; 477} 478 479static int 480onscanlist(const struct ieee80211_scan_state *ss, 481 const struct ieee80211_channel *c) 482{ 483 int i; 484 485 for (i = 0; i < ss->ss_last; i++) 486 if (ss->ss_chans[i] == c) 487 return 1; 488 return 0; 489} 490 491static void 492sweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 493 const struct scanlist table[]) 494{ 495 struct ieee80211com *ic = vap->iv_ic; 496 struct ieee80211_channel *c; 497 int i; 498 499 for (i = 0; i < ic->ic_nchans; i++) { 500 if (ss->ss_last >= IEEE80211_SCAN_MAX) 501 break; 502 503 c = &ic->ic_channels[i]; 504 /* 505 * Ignore dynamic turbo channels; we scan them 506 * in normal mode (i.e. not boosted). Likewise 507 * for HT channels, they get scanned using 508 * legacy rates. 509 */ 510 if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c)) 511 continue; 512 513 /* 514 * If a desired mode was specified, scan only 515 * channels that satisfy that constraint. 516 */ 517 if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 518 vap->iv_des_mode != ieee80211_chan2mode(c)) 519 continue; 520 521 /* 522 * Skip channels excluded by user request. 523 */ 524 if (isexcluded(vap, c)) 525 continue; 526 527 /* 528 * Add the channel unless it is listed in the 529 * fixed scan order tables. This insures we 530 * don't sweep back in channels we filtered out 531 * above. 532 */ 533 if (checktable(table, c)) 534 continue; 535 536 /* Add channel to scanning list. */ 537 ss->ss_chans[ss->ss_last++] = c; 538 } 539 /* 540 * Explicitly add any desired channel if: 541 * - not already on the scan list 542 * - allowed by any desired mode constraint 543 * - there is space in the scan list 544 * This allows the channel to be used when the filtering 545 * mechanisms would otherwise elide it (e.g HT, turbo). 546 */ 547 c = vap->iv_des_chan; 548 if (c != IEEE80211_CHAN_ANYC && 549 !onscanlist(ss, c) && 550 (vap->iv_des_mode == IEEE80211_MODE_AUTO || 551 vap->iv_des_mode == ieee80211_chan2mode(c)) && 552 ss->ss_last < IEEE80211_SCAN_MAX) 553 ss->ss_chans[ss->ss_last++] = c; 554} 555 556static void 557makescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 558 const struct scanlist table[]) 559{ 560 const struct scanlist *scan; 561 enum ieee80211_phymode mode; 562 563 ss->ss_last = 0; 564 /* 565 * Use the table of ordered channels to construct the list 566 * of channels for scanning. Any channels in the ordered 567 * list not in the master list will be discarded. 568 */ 569 for (scan = table; scan->list != NULL; scan++) { 570 mode = scan->mode; 571 if (vap->iv_des_mode != IEEE80211_MODE_AUTO) { 572 /* 573 * If a desired mode was specified, scan only 574 * channels that satisfy that constraint. 575 */ 576 if (vap->iv_des_mode != mode) { 577 /* 578 * The scan table marks 2.4Ghz channels as b 579 * so if the desired mode is 11g, then use 580 * the 11b channel list but upgrade the mode. 581 */ 582 if (vap->iv_des_mode != IEEE80211_MODE_11G || 583 mode != IEEE80211_MODE_11B) 584 continue; 585 mode = IEEE80211_MODE_11G; /* upgrade */ 586 } 587 } else { 588 /* 589 * This lets add_channels upgrade an 11b channel 590 * to 11g if available. 591 */ 592 if (mode == IEEE80211_MODE_11B) 593 mode = IEEE80211_MODE_AUTO; 594 } 595#ifdef IEEE80211_F_XR 596 /* XR does not operate on turbo channels */ 597 if ((vap->iv_flags & IEEE80211_F_XR) && 598 (mode == IEEE80211_MODE_TURBO_A || 599 mode == IEEE80211_MODE_TURBO_G || 600 mode == IEEE80211_MODE_STURBO_A)) 601 continue; 602#endif 603 /* 604 * Add the list of the channels; any that are not 605 * in the master channel list will be discarded. 606 */ 607 add_channels(vap, ss, mode, scan->list, scan->count); 608 } 609 610 /* 611 * Add the channels from the ic that are not present 612 * in the table. 613 */ 614 sweepchannels(ss, vap, table); 615} 616 617static const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 618{ 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 619static const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 620{ 5170, 5190, 5210, 5230 }; 621static const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 622{ 2412, 2437, 2462, 2442, 2472 }; 623static const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 624{ 5745, 5765, 5785, 5805, 5825 }; 625static const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ 626{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; 627static const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 628{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 629static const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 630{ 2484 }; 631static const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 632{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 633static const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ 634{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; 635#ifdef ATH_TURBO_SCAN 636static const uint16_t rcl5[] = /* 3 static turbo channels */ 637{ 5210, 5250, 5290 }; 638static const uint16_t rcl6[] = /* 2 static turbo channels */ 639{ 5760, 5800 }; 640static const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 641{ 5540, 5580, 5620, 5660 }; 642static const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 643{ 2437 }; 644static const uint16_t rcl13[] = /* dynamic Turbo channels */ 645{ 5200, 5240, 5280, 5765, 5805 }; 646#endif /* ATH_TURBO_SCAN */ 647 648#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a 649 650static const struct scanlist staScanTable[] = { 651 { IEEE80211_MODE_11B, X(rcl3) }, 652 { IEEE80211_MODE_11A, X(rcl1) }, 653 { IEEE80211_MODE_11A, X(rcl2) }, 654 { IEEE80211_MODE_11B, X(rcl8) }, 655 { IEEE80211_MODE_11B, X(rcl9) }, 656 { IEEE80211_MODE_11A, X(rcl4) }, 657#ifdef ATH_TURBO_SCAN 658 { IEEE80211_MODE_STURBO_A, X(rcl5) }, 659 { IEEE80211_MODE_STURBO_A, X(rcl6) }, 660 { IEEE80211_MODE_TURBO_A, X(rcl6x) }, 661 { IEEE80211_MODE_TURBO_A, X(rcl13) }, 662#endif /* ATH_TURBO_SCAN */ 663 { IEEE80211_MODE_11A, X(rcl7) }, 664 { IEEE80211_MODE_11B, X(rcl10) }, 665 { IEEE80211_MODE_11A, X(rcl11) }, 666#ifdef ATH_TURBO_SCAN 667 { IEEE80211_MODE_TURBO_G, X(rcl12) }, 668#endif /* ATH_TURBO_SCAN */ 669 { .list = NULL } 670}; 671 672/* 673 * Start a station-mode scan by populating the channel list. 674 */ 675static int 676sta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 677{ 678 struct sta_table *st = ss->ss_priv; 679 680 makescanlist(ss, vap, staScanTable); 681 682 if (ss->ss_mindwell == 0) 683 ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ 684 if (ss->ss_maxdwell == 0) 685 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 686 687 st->st_scangen++; 688 st->st_newscan = 1; 689 690 return 0; 691} 692 693/* 694 * Restart a scan, typically a bg scan but can 695 * also be a fg scan that came up empty. 696 */ 697static int 698sta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 699{ 700 struct sta_table *st = ss->ss_priv; 701 702 st->st_newscan = 1; 703 return 0; 704} 705 706/* 707 * Cancel an ongoing scan. 708 */ 709static int 710sta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 711{ 712 return 0; 713} 714 715/* unalligned little endian access */ 716#define LE_READ_2(p) \ 717 ((uint16_t) \ 718 ((((const uint8_t *)(p))[0] ) | \ 719 (((const uint8_t *)(p))[1] << 8))) 720 721/* 722 * Demote any supplied 11g channel to 11b. There should 723 * always be an 11b channel but we check anyway... 724 */ 725static struct ieee80211_channel * 726demote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan) 727{ 728 struct ieee80211_channel *c; 729 730 if (IEEE80211_IS_CHAN_ANYG(chan) && 731 vap->iv_des_mode == IEEE80211_MODE_AUTO) { 732 c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq, 733 (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) | 734 IEEE80211_CHAN_B); 735 if (c != NULL) 736 chan = c; 737 } 738 return chan; 739} 740 741static int 742maxrate(const struct ieee80211_scan_entry *se) 743{ 744 const struct ieee80211_ie_htcap *htcap = 745 (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie; 746 int rmax, r, i; 747 uint16_t caps; 748 749 rmax = 0; 750 if (htcap != NULL) { 751 /* 752 * HT station; inspect supported MCS and then adjust 753 * rate by channel width. Could also include short GI 754 * in this if we want to be extra accurate. 755 */ 756 /* XXX assumes MCS15 is max */ 757 for (i = 15; i >= 0 && isclr(htcap->hc_mcsset, i); i--) 758 ; 759 if (i >= 0) { 760 caps = LE_READ_2(&htcap->hc_cap); 761 /* XXX short/long GI */ 762 if (caps & IEEE80211_HTCAP_CHWIDTH40) 763 rmax = ieee80211_htrates[i].ht40_rate_400ns; 764 else 765 rmax = ieee80211_htrates[i].ht40_rate_800ns; 766 } 767 } 768 for (i = 0; i < se->se_rates[1]; i++) { 769 r = se->se_rates[2+i] & IEEE80211_RATE_VAL; 770 if (r > rmax) 771 rmax = r; 772 } 773 for (i = 0; i < se->se_xrates[1]; i++) { 774 r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; 775 if (r > rmax) 776 rmax = r; 777 } 778 return rmax; 779} 780 781/* 782 * Compare the capabilities of two entries and decide which is 783 * more desirable (return >0 if a is considered better). Note 784 * that we assume compatibility/usability has already been checked 785 * so we don't need to (e.g. validate whether privacy is supported). 786 * Used to select the best scan candidate for association in a BSS. 787 */ 788static int 789sta_compare(const struct sta_entry *a, const struct sta_entry *b) 790{ 791#define PREFER(_a,_b,_what) do { \ 792 if (((_a) ^ (_b)) & (_what)) \ 793 return ((_a) & (_what)) ? 1 : -1; \ 794} while (0) 795 int maxa, maxb; 796 int8_t rssia, rssib; 797 int weight; 798 799 /* privacy support */ 800 PREFER(a->base.se_capinfo, b->base.se_capinfo, 801 IEEE80211_CAPINFO_PRIVACY); 802 803 /* compare count of previous failures */ 804 weight = b->se_fails - a->se_fails; 805 if (abs(weight) > 1) 806 return weight; 807 808 /* 809 * Compare rssi. If the two are considered equivalent 810 * then fallback to other criteria. We threshold the 811 * comparisons to avoid selecting an ap purely by rssi 812 * when both values may be good but one ap is otherwise 813 * more desirable (e.g. an 11b-only ap with stronger 814 * signal than an 11g ap). 815 */ 816 rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 817 rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 818 if (abs(rssib - rssia) < 5) { 819 /* best/max rate preferred if signal level close enough XXX */ 820 maxa = maxrate(&a->base); 821 maxb = maxrate(&b->base); 822 if (maxa != maxb) 823 return maxa - maxb; 824 /* XXX use freq for channel preference */ 825 /* for now just prefer 5Ghz band to all other bands */ 826 PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 827 IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 828 } 829 /* all things being equal, use signal level */ 830 return a->base.se_rssi - b->base.se_rssi; 831#undef PREFER 832} 833 834/* 835 * Check rate set suitability and return the best supported rate. 836 * XXX inspect MCS for HT 837 */ 838static int 839check_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, 840 const struct ieee80211_scan_entry *se) 841{ 842#define RV(v) ((v) & IEEE80211_RATE_VAL) 843 const struct ieee80211_rateset *srs; 844 int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 845 const uint8_t *rs; 846 847 okrate = badrate = 0; 848 849 srs = ieee80211_get_suprates(vap->iv_ic, chan); 850 nrs = se->se_rates[1]; 851 rs = se->se_rates+2; 852 /* XXX MCS */ 853 ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; 854 fixedrate = IEEE80211_FIXED_RATE_NONE; 855again: 856 for (i = 0; i < nrs; i++) { 857 r = RV(rs[i]); 858 badrate = r; 859 /* 860 * Check any fixed rate is included. 861 */ 862 if (r == ucastrate) 863 fixedrate = r; 864 /* 865 * Check against our supported rates. 866 */ 867 for (j = 0; j < srs->rs_nrates; j++) 868 if (r == RV(srs->rs_rates[j])) { 869 if (r > okrate) /* NB: track max */ 870 okrate = r; 871 break; 872 } 873 874 if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 875 /* 876 * Don't try joining a BSS, if we don't support 877 * one of its basic rates. 878 */ 879 okrate = 0; 880 goto back; 881 } 882 } 883 if (rs == se->se_rates+2) { 884 /* scan xrates too; sort of an algol68-style for loop */ 885 nrs = se->se_xrates[1]; 886 rs = se->se_xrates+2; 887 goto again; 888 } 889 890back: 891 if (okrate == 0 || ucastrate != fixedrate) 892 return badrate | IEEE80211_RATE_BASIC; 893 else 894 return RV(okrate); 895#undef RV 896} 897 898static int 899match_ssid(const uint8_t *ie, 900 int nssid, const struct ieee80211_scan_ssid ssids[]) 901{ 902 int i; 903 904 for (i = 0; i < nssid; i++) { 905 if (ie[1] == ssids[i].len && 906 memcmp(ie+2, ssids[i].ssid, ie[1]) == 0) 907 return 1; 908 } 909 return 0; 910} 911 912#ifdef IEEE80211_SUPPORT_TDMA 913static int 914tdma_isfull(const struct ieee80211_tdma_param *tdma) 915{ 916 int slot, slotcnt; 917 918 slotcnt = tdma->tdma_slotcnt; 919 for (slot = slotcnt-1; slot >= 0; slot--) 920 if (isclr(tdma->tdma_inuse, slot)) 921 return 0; 922 return 1; 923} 924#endif /* IEEE80211_SUPPORT_TDMA */ 925 926/* 927 * Test a scan candidate for suitability/compatibility. 928 */ 929static int 930match_bss(struct ieee80211vap *vap, 931 const struct ieee80211_scan_state *ss, struct sta_entry *se0, 932 int debug) 933{ 934 struct ieee80211com *ic = vap->iv_ic; 935 struct ieee80211_scan_entry *se = &se0->base; 936 uint8_t rate; 937 int fail; 938 939 fail = 0; 940 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 941 fail |= MATCH_CHANNEL; 942 /* 943 * NB: normally the desired mode is used to construct 944 * the channel list, but it's possible for the scan 945 * cache to include entries for stations outside this 946 * list so we check the desired mode here to weed them 947 * out. 948 */ 949 if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 950 (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 951 chanflags[vap->iv_des_mode]) 952 fail |= MATCH_CHANNEL; 953 if (vap->iv_opmode == IEEE80211_M_IBSS) { 954 if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 955 fail |= MATCH_CAPINFO; 956#ifdef IEEE80211_SUPPORT_TDMA 957 } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) { 958 /* 959 * Adhoc demo network setup shouldn't really be scanning 960 * but just in case skip stations operating in IBSS or 961 * BSS mode. 962 */ 963 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 964 fail |= MATCH_CAPINFO; 965 /* 966 * TDMA operation cannot coexist with a normal 802.11 network; 967 * skip if IBSS or ESS capabilities are marked and require 968 * the beacon have a TDMA ie present. 969 */ 970 if (vap->iv_caps & IEEE80211_C_TDMA) { 971 const struct ieee80211_tdma_param *tdma = 972 (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie; 973 974 if (tdma == NULL) 975 fail |= MATCH_TDMA_NOIE; 976 else if (tdma->tdma_slot != 0) 977 fail |= MATCH_TDMA_NOTMASTER; 978 else if (tdma_isfull(tdma)) 979 fail |= MATCH_TDMA_NOSLOT; 980#if 0 981 else if (ieee80211_local_address(se->se_macaddr)) 982 fail |= MATCH_TDMA_LOCAL; 983#endif 984 } 985#endif /* IEEE80211_SUPPORT_TDMA */ 986 } else { 987 if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 988 fail |= MATCH_CAPINFO; 989 /* 990 * If 11d is enabled and we're attempting to join a bss 991 * that advertises it's country code then compare our 992 * current settings to what we fetched from the country ie. 993 * If our country code is unspecified or different then do 994 * not attempt to join the bss. We should have already 995 * dispatched an event to user space that identifies the 996 * new country code so our regdomain config should match. 997 */ 998 if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 999 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 1000 se->se_cc[0] != 0 && 1001 (ic->ic_regdomain.country == CTRY_DEFAULT || 1002 !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 1003 fail |= MATCH_CC; 1004 } 1005 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1006 if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 1007 fail |= MATCH_PRIVACY; 1008 } else { 1009 /* XXX does this mean privacy is supported or required? */ 1010 if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 1011 fail |= MATCH_PRIVACY; 1012 } 1013 se0->se_flags &= ~STA_DEMOTE11B; 1014 rate = check_rate(vap, se->se_chan, se); 1015 if (rate & IEEE80211_RATE_BASIC) { 1016 fail |= MATCH_RATE; 1017 /* 1018 * An 11b-only ap will give a rate mismatch if there is an 1019 * OFDM fixed tx rate for 11g. Try downgrading the channel 1020 * in the scan list to 11b and retry the rate check. 1021 */ 1022 if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { 1023 rate = check_rate(vap, demote11b(vap, se->se_chan), se); 1024 if ((rate & IEEE80211_RATE_BASIC) == 0) { 1025 fail &= ~MATCH_RATE; 1026 se0->se_flags |= STA_DEMOTE11B; 1027 } 1028 } 1029 } else if (rate < 2*24) { 1030 /* 1031 * This is an 11b-only ap. Check the desired mode in 1032 * case that needs to be honored (mode 11g filters out 1033 * 11b-only ap's). Otherwise force any 11g channel used 1034 * in scanning to be demoted. 1035 * 1036 * NB: we cheat a bit here by looking at the max rate; 1037 * we could/should check the rates. 1038 */ 1039 if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || 1040 vap->iv_des_mode == IEEE80211_MODE_11B)) 1041 fail |= MATCH_RATE; 1042 else 1043 se0->se_flags |= STA_DEMOTE11B; 1044 } 1045 if (ss->ss_nssid != 0 && 1046 !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 1047 fail |= MATCH_SSID; 1048 if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 1049 !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 1050 fail |= MATCH_BSSID; 1051 if (se0->se_fails >= STA_FAILS_MAX) 1052 fail |= MATCH_FAILS; 1053 if (se0->se_notseen >= STA_PURGE_SCANS) 1054 fail |= MATCH_NOTSEEN; 1055 if (se->se_rssi < STA_RSSI_MIN) 1056 fail |= MATCH_RSSI; 1057#ifdef IEEE80211_DEBUG 1058 if (ieee80211_msg(vap, debug)) { 1059 printf(" %c %s", 1060 fail & MATCH_FAILS ? '=' : 1061 fail & MATCH_NOTSEEN ? '^' : 1062 fail & MATCH_CC ? '$' : 1063#ifdef IEEE80211_SUPPORT_TDMA 1064 fail & MATCH_TDMA_NOIE ? '&' : 1065 fail & MATCH_TDMA_NOTMASTER ? ':' : 1066 fail & MATCH_TDMA_NOSLOT ? '@' : 1067 fail & MATCH_TDMA_LOCAL ? '#' : 1068#endif 1069 fail ? '-' : '+', ether_sprintf(se->se_macaddr)); 1070 printf(" %s%c", ether_sprintf(se->se_bssid), 1071 fail & MATCH_BSSID ? '!' : ' '); 1072 printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 1073 fail & MATCH_CHANNEL ? '!' : ' '); 1074 printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 1075 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1076 fail & MATCH_RATE ? '!' : ' '); 1077 printf(" %4s%c", 1078 (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1079 (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : 1080 "????", 1081 fail & MATCH_CAPINFO ? '!' : ' '); 1082 printf(" %3s%c ", 1083 (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1084 "wep" : "no", 1085 fail & MATCH_PRIVACY ? '!' : ' '); 1086 ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 1087 printf("%s\n", fail & MATCH_SSID ? "!" : ""); 1088 } 1089#endif 1090 return fail; 1091} 1092 1093static void 1094sta_update_notseen(struct sta_table *st) 1095{ 1096 struct sta_entry *se; 1097 1098 mtx_lock(&st->st_lock); 1099 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1100 /* 1101 * If seen the reset and don't bump the count; 1102 * otherwise bump the ``not seen'' count. Note 1103 * that this insures that stations for which we 1104 * see frames while not scanning but not during 1105 * this scan will not be penalized. 1106 */ 1107 if (se->se_seen) 1108 se->se_seen = 0; 1109 else 1110 se->se_notseen++; 1111 } 1112 mtx_unlock(&st->st_lock); 1113} 1114 1115static void 1116sta_dec_fails(struct sta_table *st) 1117{ 1118 struct sta_entry *se; 1119 1120 mtx_lock(&st->st_lock); 1121 TAILQ_FOREACH(se, &st->st_entry, se_list) 1122 if (se->se_fails) 1123 se->se_fails--; 1124 mtx_unlock(&st->st_lock); 1125} 1126 1127static struct sta_entry * 1128select_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 1129{ 1130 struct sta_table *st = ss->ss_priv; 1131 struct sta_entry *se, *selbs = NULL; 1132 1133 IEEE80211_DPRINTF(vap, debug, " %s\n", 1134 "macaddr bssid chan rssi rate flag wep essid"); 1135 mtx_lock(&st->st_lock); 1136 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1137 ieee80211_ies_expand(&se->base.se_ies); 1138 if (match_bss(vap, ss, se, debug) == 0) { 1139 if (selbs == NULL) 1140 selbs = se; 1141 else if (sta_compare(se, selbs) > 0) 1142 selbs = se; 1143 } 1144 } 1145 mtx_unlock(&st->st_lock); 1146 1147 return selbs; 1148} 1149 1150/* 1151 * Pick an ap or ibss network to join or find a channel 1152 * to use to start an ibss network. 1153 */ 1154static int 1155sta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1156{ 1157 struct sta_table *st = ss->ss_priv; 1158 struct sta_entry *selbs; 1159 struct ieee80211_channel *chan; 1160 1161 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1162 ("wrong mode %u", vap->iv_opmode)); 1163 1164 if (st->st_newscan) { 1165 sta_update_notseen(st); 1166 st->st_newscan = 0; 1167 } 1168 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1169 /* 1170 * Manual/background scan, don't select+join the 1171 * bss, just return. The scanning framework will 1172 * handle notification that this has completed. 1173 */ 1174 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1175 return 1; 1176 } 1177 /* 1178 * Automatic sequencing; look for a candidate and 1179 * if found join the network. 1180 */ 1181 /* NB: unlocked read should be ok */ 1182 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1183 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1184 "%s: no scan candidate\n", __func__); 1185 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1186 return 0; 1187notfound: 1188 /* 1189 * If nothing suitable was found decrement 1190 * the failure counts so entries will be 1191 * reconsidered the next time around. We 1192 * really want to do this only for sta's 1193 * where we've previously had some success. 1194 */ 1195 sta_dec_fails(st); 1196 st->st_newscan = 1; 1197 return 0; /* restart scan */ 1198 } 1199 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1200 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1201 return (selbs != NULL); 1202 if (selbs == NULL) 1203 goto notfound; 1204 chan = selbs->base.se_chan; 1205 if (selbs->se_flags & STA_DEMOTE11B) 1206 chan = demote11b(vap, chan); 1207 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1208 goto notfound; 1209 return 1; /* terminate scan */ 1210} 1211 1212/* 1213 * Lookup an entry in the scan cache. We assume we're 1214 * called from the bottom half or such that we don't need 1215 * to block the bottom half so that it's safe to return 1216 * a reference to an entry w/o holding the lock on the table. 1217 */ 1218static struct sta_entry * 1219sta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1220{ 1221 struct sta_entry *se; 1222 int hash = STA_HASH(macaddr); 1223 1224 mtx_lock(&st->st_lock); 1225 LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1226 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1227 break; 1228 mtx_unlock(&st->st_lock); 1229 1230 return se; /* NB: unlocked */ 1231} 1232 1233static void 1234sta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1235{ 1236 struct ieee80211com *ic = vap->iv_ic; 1237 struct ieee80211_node *ni = vap->iv_bss; 1238 struct sta_table *st = ss->ss_priv; 1239 enum ieee80211_phymode mode; 1240 struct sta_entry *se, *selbs; 1241 uint8_t roamRate, curRate, ucastRate; 1242 int8_t roamRssi, curRssi; 1243 1244 se = sta_lookup(st, ni->ni_macaddr); 1245 if (se == NULL) { 1246 /* XXX something is wrong */ 1247 return; 1248 } 1249 1250 mode = ieee80211_chan2mode(ic->ic_bsschan); 1251 roamRate = vap->iv_roamparms[mode].rate; 1252 roamRssi = vap->iv_roamparms[mode].rssi; 1253 ucastRate = vap->iv_txparms[mode].ucastrate; 1254 /* NB: the most up to date rssi is in the node, not the scan cache */ 1255 curRssi = ic->ic_node_getrssi(ni); 1256 if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1257 curRate = ni->ni_txrate; 1258 roamRate &= IEEE80211_RATE_VAL; 1259 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1260 "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1261 __func__, curRssi, curRate, roamRssi, roamRate); 1262 } else { 1263 curRate = roamRate; /* NB: insure compare below fails */ 1264 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1265 "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1266 } 1267 /* 1268 * Check if a new ap should be used and switch. 1269 * XXX deauth current ap 1270 */ 1271 if (curRate < roamRate || curRssi < roamRssi) { 1272 if (time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1273 /* 1274 * Scan cache contents are too old; force a scan now 1275 * if possible so we have current state to make a 1276 * decision with. We don't kick off a bg scan if 1277 * we're using dynamic turbo and boosted or if the 1278 * channel is busy. 1279 * XXX force immediate switch on scan complete 1280 */ 1281 if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1282 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)) 1283 ieee80211_bg_scan(vap, 0); 1284 return; 1285 } 1286 se->base.se_rssi = curRssi; 1287 selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1288 if (selbs != NULL && selbs != se) { 1289 struct ieee80211_channel *chan; 1290 1291 IEEE80211_DPRINTF(vap, 1292 IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1293 "%s: ROAM: curRate %u, roamRate %u, " 1294 "curRssi %d, roamRssi %d\n", __func__, 1295 curRate, roamRate, curRssi, roamRssi); 1296 1297 chan = selbs->base.se_chan; 1298 if (selbs->se_flags & STA_DEMOTE11B) 1299 chan = demote11b(vap, chan); 1300 (void) ieee80211_sta_join(vap, chan, &selbs->base); 1301 } 1302 } 1303} 1304 1305/* 1306 * Age entries in the scan cache. 1307 * XXX also do roaming since it's convenient 1308 */ 1309static void 1310sta_age(struct ieee80211_scan_state *ss) 1311{ 1312 struct ieee80211vap *vap = ss->ss_vap; 1313 1314 adhoc_age(ss); 1315 /* 1316 * If rate control is enabled check periodically to see if 1317 * we should roam from our current connection to one that 1318 * might be better. This only applies when we're operating 1319 * in sta mode and automatic roaming is set. 1320 * XXX defer if busy 1321 * XXX repeater station 1322 * XXX do when !bgscan? 1323 */ 1324 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1325 ("wrong mode %u", vap->iv_opmode)); 1326 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1327 (vap->iv_ic->ic_flags & IEEE80211_F_BGSCAN) && 1328 vap->iv_state >= IEEE80211_S_RUN) 1329 /* XXX vap is implicit */ 1330 sta_roam_check(ss, vap); 1331} 1332 1333/* 1334 * Iterate over the entries in the scan cache, invoking 1335 * the callback function on each one. 1336 */ 1337static void 1338sta_iterate(struct ieee80211_scan_state *ss, 1339 ieee80211_scan_iter_func *f, void *arg) 1340{ 1341 struct sta_table *st = ss->ss_priv; 1342 struct sta_entry *se; 1343 u_int gen; 1344 1345 mtx_lock(&st->st_scanlock); 1346 gen = st->st_scaniter++; 1347restart: 1348 mtx_lock(&st->st_lock); 1349 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1350 if (se->se_scangen != gen) { 1351 se->se_scangen = gen; 1352 /* update public state */ 1353 se->base.se_age = ticks - se->se_lastupdate; 1354 mtx_unlock(&st->st_lock); 1355 (*f)(arg, &se->base); 1356 goto restart; 1357 } 1358 } 1359 mtx_unlock(&st->st_lock); 1360 1361 mtx_unlock(&st->st_scanlock); 1362} 1363 1364static void 1365sta_assoc_fail(struct ieee80211_scan_state *ss, 1366 const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1367{ 1368 struct sta_table *st = ss->ss_priv; 1369 struct sta_entry *se; 1370 1371 se = sta_lookup(st, macaddr); 1372 if (se != NULL) { 1373 se->se_fails++; 1374 se->se_lastfail = ticks; 1375 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1376 macaddr, "%s: reason %u fails %u", 1377 __func__, reason, se->se_fails); 1378 } 1379} 1380 1381static void 1382sta_assoc_success(struct ieee80211_scan_state *ss, 1383 const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1384{ 1385 struct sta_table *st = ss->ss_priv; 1386 struct sta_entry *se; 1387 1388 se = sta_lookup(st, macaddr); 1389 if (se != NULL) { 1390#if 0 1391 se->se_fails = 0; 1392 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1393 macaddr, "%s: fails %u", 1394 __func__, se->se_fails); 1395#endif 1396 se->se_lastassoc = ticks; 1397 } 1398} 1399 1400static const struct ieee80211_scanner sta_default = { 1401 .scan_name = "default", 1402 .scan_attach = sta_attach, 1403 .scan_detach = sta_detach, 1404 .scan_start = sta_start, 1405 .scan_restart = sta_restart, 1406 .scan_cancel = sta_cancel, 1407 .scan_end = sta_pick_bss, 1408 .scan_flush = sta_flush, 1409 .scan_add = sta_add, 1410 .scan_age = sta_age, 1411 .scan_iterate = sta_iterate, 1412 .scan_assoc_fail = sta_assoc_fail, 1413 .scan_assoc_success = sta_assoc_success, 1414}; 1415 1416/* 1417 * Adhoc mode-specific support. 1418 */ 1419 1420static const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1421{ 5180, 5200, 5220, 5240 }; 1422static const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1423{ 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1424static const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1425{ 5170, 5190, 5210, 5230 }; 1426static const uint16_t adhoc11b[] = /* 10, 11 */ 1427{ 2457, 2462 }; 1428 1429static const struct scanlist adhocScanTable[] = { 1430 { IEEE80211_MODE_11B, X(adhoc11b) }, 1431 { IEEE80211_MODE_11A, X(adhocWorld) }, 1432 { IEEE80211_MODE_11A, X(adhocFcc3) }, 1433 { IEEE80211_MODE_11B, X(adhocMkk) }, 1434 { .list = NULL } 1435}; 1436#undef X 1437 1438/* 1439 * Start an adhoc-mode scan by populating the channel list. 1440 */ 1441static int 1442adhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1443{ 1444 struct sta_table *st = ss->ss_priv; 1445 1446 makescanlist(ss, vap, adhocScanTable); 1447 1448 if (ss->ss_mindwell == 0) 1449 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1450 if (ss->ss_maxdwell == 0) 1451 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1452 1453 st->st_scangen++; 1454 st->st_newscan = 1; 1455 1456 return 0; 1457} 1458 1459/* 1460 * Select a channel to start an adhoc network on. 1461 * The channel list was populated with appropriate 1462 * channels so select one that looks least occupied. 1463 */ 1464static struct ieee80211_channel * 1465adhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1466{ 1467 struct sta_table *st = ss->ss_priv; 1468 struct sta_entry *se; 1469 struct ieee80211_channel *c, *bestchan; 1470 int i, bestrssi, maxrssi; 1471 1472 bestchan = NULL; 1473 bestrssi = -1; 1474 1475 mtx_lock(&st->st_lock); 1476 for (i = 0; i < ss->ss_last; i++) { 1477 c = ss->ss_chans[i]; 1478 /* never consider a channel with radar */ 1479 if (IEEE80211_IS_CHAN_RADAR(c)) 1480 continue; 1481 /* skip channels disallowed by regulatory settings */ 1482 if (IEEE80211_IS_CHAN_NOADHOC(c)) 1483 continue; 1484 /* check channel attributes for band compatibility */ 1485 if (flags != 0 && (c->ic_flags & flags) != flags) 1486 continue; 1487 maxrssi = 0; 1488 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1489 if (se->base.se_chan != c) 1490 continue; 1491 if (se->base.se_rssi > maxrssi) 1492 maxrssi = se->base.se_rssi; 1493 } 1494 if (bestchan == NULL || maxrssi < bestrssi) 1495 bestchan = c; 1496 } 1497 mtx_unlock(&st->st_lock); 1498 1499 return bestchan; 1500} 1501 1502/* 1503 * Pick an ibss network to join or find a channel 1504 * to use to start an ibss network. 1505 */ 1506static int 1507adhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1508{ 1509 struct sta_table *st = ss->ss_priv; 1510 struct sta_entry *selbs; 1511 struct ieee80211_channel *chan; 1512 1513 KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1514 vap->iv_opmode == IEEE80211_M_AHDEMO, 1515 ("wrong opmode %u", vap->iv_opmode)); 1516 1517 if (st->st_newscan) { 1518 sta_update_notseen(st); 1519 st->st_newscan = 0; 1520 } 1521 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1522 /* 1523 * Manual/background scan, don't select+join the 1524 * bss, just return. The scanning framework will 1525 * handle notification that this has completed. 1526 */ 1527 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1528 return 1; 1529 } 1530 /* 1531 * Automatic sequencing; look for a candidate and 1532 * if found join the network. 1533 */ 1534 /* NB: unlocked read should be ok */ 1535 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1536 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1537 "%s: no scan candidate\n", __func__); 1538 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1539 return 0; 1540notfound: 1541 /* NB: never auto-start a tdma network for slot !0 */ 1542#ifdef IEEE80211_SUPPORT_TDMA 1543 if (vap->iv_des_nssid && 1544 ((vap->iv_caps & IEEE80211_C_TDMA) == 0 || 1545 ieee80211_tdma_getslot(vap) == 0)) { 1546#else 1547 if (vap->iv_des_nssid) { 1548#endif 1549 /* 1550 * No existing adhoc network to join and we have 1551 * an ssid; start one up. If no channel was 1552 * specified, try to select a channel. 1553 */ 1554 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1555 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1556 struct ieee80211com *ic = vap->iv_ic; 1557 1558 chan = adhoc_pick_channel(ss, 0); 1559 if (chan != NULL) 1560 chan = ieee80211_ht_adjust_channel(ic, 1561 chan, vap->iv_flags_ext); 1562 } else 1563 chan = vap->iv_des_chan; 1564 if (chan != NULL) { 1565 ieee80211_create_ibss(vap, chan); 1566 return 1; 1567 } 1568 } 1569 /* 1570 * If nothing suitable was found decrement 1571 * the failure counts so entries will be 1572 * reconsidered the next time around. We 1573 * really want to do this only for sta's 1574 * where we've previously had some success. 1575 */ 1576 sta_dec_fails(st); 1577 st->st_newscan = 1; 1578 return 0; /* restart scan */ 1579 } 1580 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1581 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1582 return (selbs != NULL); 1583 if (selbs == NULL) 1584 goto notfound; 1585 chan = selbs->base.se_chan; 1586 if (selbs->se_flags & STA_DEMOTE11B) 1587 chan = demote11b(vap, chan); 1588 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1589 goto notfound; 1590 return 1; /* terminate scan */ 1591} 1592 1593/* 1594 * Age entries in the scan cache. 1595 */ 1596static void 1597adhoc_age(struct ieee80211_scan_state *ss) 1598{ 1599 struct sta_table *st = ss->ss_priv; 1600 struct sta_entry *se, *next; 1601 1602 mtx_lock(&st->st_lock); 1603 TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 1604 if (se->se_notseen > STA_PURGE_SCANS) { 1605 TAILQ_REMOVE(&st->st_entry, se, se_list); 1606 LIST_REMOVE(se, se_hash); 1607 ieee80211_ies_cleanup(&se->base.se_ies); 1608 free(se, M_80211_SCAN); 1609 } 1610 } 1611 mtx_unlock(&st->st_lock); 1612} 1613 1614static const struct ieee80211_scanner adhoc_default = { 1615 .scan_name = "default", 1616 .scan_attach = sta_attach, 1617 .scan_detach = sta_detach, 1618 .scan_start = adhoc_start, 1619 .scan_restart = sta_restart, 1620 .scan_cancel = sta_cancel, 1621 .scan_end = adhoc_pick_bss, 1622 .scan_flush = sta_flush, 1623 .scan_pickchan = adhoc_pick_channel, 1624 .scan_add = sta_add, 1625 .scan_age = adhoc_age, 1626 .scan_iterate = sta_iterate, 1627 .scan_assoc_fail = sta_assoc_fail, 1628 .scan_assoc_success = sta_assoc_success, 1629}; 1630 1631static void 1632ap_force_promisc(struct ieee80211com *ic) 1633{ 1634 struct ifnet *ifp = ic->ic_ifp; 1635 1636 IEEE80211_LOCK(ic); 1637 /* set interface into promiscuous mode */ 1638 ifp->if_flags |= IFF_PROMISC; 1639 ic->ic_update_promisc(ifp); 1640 IEEE80211_UNLOCK(ic); 1641} 1642 1643static void 1644ap_reset_promisc(struct ieee80211com *ic) 1645{ 1646 IEEE80211_LOCK(ic); 1647 ieee80211_syncifflag_locked(ic, IFF_PROMISC); 1648 IEEE80211_UNLOCK(ic); 1649} 1650 1651static int 1652ap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1653{ 1654 struct sta_table *st = ss->ss_priv; 1655 1656 makescanlist(ss, vap, staScanTable); 1657 1658 if (ss->ss_mindwell == 0) 1659 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1660 if (ss->ss_maxdwell == 0) 1661 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1662 1663 st->st_scangen++; 1664 st->st_newscan = 1; 1665 1666 ap_force_promisc(vap->iv_ic); 1667 return 0; 1668} 1669 1670/* 1671 * Cancel an ongoing scan. 1672 */ 1673static int 1674ap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1675{ 1676 ap_reset_promisc(vap->iv_ic); 1677 return 0; 1678} 1679 1680/* 1681 * Pick a quiet channel to use for ap operation. 1682 */ 1683static struct ieee80211_channel * 1684ap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1685{ 1686 struct sta_table *st = ss->ss_priv; 1687 struct ieee80211_channel *bestchan = NULL; 1688 int i; 1689 1690 /* XXX select channel more intelligently, e.g. channel spread, power */ 1691 /* NB: use scan list order to preserve channel preference */ 1692 for (i = 0; i < ss->ss_last; i++) { 1693 struct ieee80211_channel *chan = ss->ss_chans[i]; 1694 /* 1695 * If the channel is unoccupied the max rssi 1696 * should be zero; just take it. Otherwise 1697 * track the channel with the lowest rssi and 1698 * use that when all channels appear occupied. 1699 */ 1700 if (IEEE80211_IS_CHAN_RADAR(chan)) 1701 continue; 1702 if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1703 continue; 1704 /* check channel attributes for band compatibility */ 1705 if (flags != 0 && (chan->ic_flags & flags) != flags) 1706 continue; 1707 KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size")); 1708 /* XXX channel have interference */ 1709 if (st->st_maxrssi[chan->ic_ieee] == 0) { 1710 /* XXX use other considerations */ 1711 return chan; 1712 } 1713 if (bestchan == NULL || 1714 st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1715 bestchan = chan; 1716 } 1717 return bestchan; 1718} 1719 1720/* 1721 * Pick a quiet channel to use for ap operation. 1722 */ 1723static int 1724ap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1725{ 1726 struct ieee80211com *ic = vap->iv_ic; 1727 struct ieee80211_channel *bestchan; 1728 1729 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1730 ("wrong opmode %u", vap->iv_opmode)); 1731 bestchan = ap_pick_channel(ss, 0); 1732 if (bestchan == NULL) { 1733 /* no suitable channel, should not happen */ 1734 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1735 "%s: no suitable channel! (should not happen)\n", __func__); 1736 /* XXX print something? */ 1737 return 0; /* restart scan */ 1738 } 1739 /* 1740 * If this is a dynamic turbo channel, start with the unboosted one. 1741 */ 1742 if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1743 bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1744 bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1745 if (bestchan == NULL) { 1746 /* should never happen ?? */ 1747 return 0; 1748 } 1749 } 1750 ap_reset_promisc(ic); 1751 if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1752 /* 1753 * Manual/background scan, don't select+join the 1754 * bss, just return. The scanning framework will 1755 * handle notification that this has completed. 1756 */ 1757 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1758 return 1; 1759 } 1760 ieee80211_create_ibss(vap, 1761 ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ext)); 1762 return 1; 1763} 1764 1765static const struct ieee80211_scanner ap_default = { 1766 .scan_name = "default", 1767 .scan_attach = sta_attach, 1768 .scan_detach = sta_detach, 1769 .scan_start = ap_start, 1770 .scan_restart = sta_restart, 1771 .scan_cancel = ap_cancel, 1772 .scan_end = ap_end, 1773 .scan_flush = sta_flush, 1774 .scan_pickchan = ap_pick_channel, 1775 .scan_add = sta_add, 1776 .scan_age = adhoc_age, 1777 .scan_iterate = sta_iterate, 1778 .scan_assoc_success = sta_assoc_success, 1779 .scan_assoc_fail = sta_assoc_fail, 1780}; 1781 1782/* 1783 * Module glue. 1784 */ 1785IEEE80211_SCANNER_MODULE(sta, 1); 1786IEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1787IEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1788IEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1789IEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1790