ieee80211_scan_sta.c revision 208697
1/*- 2 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include <sys/cdefs.h> 27__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_scan_sta.c 208697 2010-06-01 14:17:08Z rpaulo $"); 28 29/* 30 * IEEE 802.11 station scanning support. 31 */ 32#include "opt_wlan.h" 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/kernel.h> 37#include <sys/module.h> 38 39#include <sys/socket.h> 40 41#include <net/if.h> 42#include <net/if_media.h> 43#include <net/ethernet.h> 44 45#include <net80211/ieee80211_var.h> 46#include <net80211/ieee80211_input.h> 47#include <net80211/ieee80211_regdomain.h> 48#ifdef IEEE80211_SUPPORT_TDMA 49#include <net80211/ieee80211_tdma.h> 50#endif 51#ifdef IEEE80211_SUPPORT_MESH 52#include <net80211/ieee80211_mesh.h> 53#endif 54 55#include <net/bpf.h> 56 57/* 58 * Parameters for managing cache entries: 59 * 60 * o a station with STA_FAILS_MAX failures is not considered 61 * when picking a candidate 62 * o a station that hasn't had an update in STA_PURGE_SCANS 63 * (background) scans is discarded 64 * o after STA_FAILS_AGE seconds we clear the failure count 65 */ 66#define STA_FAILS_MAX 2 /* assoc failures before ignored */ 67#define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */ 68#define STA_PURGE_SCANS 2 /* age for purging entries (scans) */ 69 70/* XXX tunable */ 71#define STA_RSSI_MIN 8 /* min acceptable rssi */ 72#define STA_RSSI_MAX 40 /* max rssi for comparison */ 73 74struct sta_entry { 75 struct ieee80211_scan_entry base; 76 TAILQ_ENTRY(sta_entry) se_list; 77 LIST_ENTRY(sta_entry) se_hash; 78 uint8_t se_fails; /* failure to associate count */ 79 uint8_t se_seen; /* seen during current scan */ 80 uint8_t se_notseen; /* not seen in previous scans */ 81 uint8_t se_flags; 82#define STA_DEMOTE11B 0x01 /* match w/ demoted 11b chan */ 83 uint32_t se_avgrssi; /* LPF rssi state */ 84 unsigned long se_lastupdate; /* time of last update */ 85 unsigned long se_lastfail; /* time of last failure */ 86 unsigned long se_lastassoc; /* time of last association */ 87 u_int se_scangen; /* iterator scan gen# */ 88 u_int se_countrygen; /* gen# of last cc notify */ 89}; 90 91#define STA_HASHSIZE 32 92/* simple hash is enough for variation of macaddr */ 93#define STA_HASH(addr) \ 94 (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE) 95 96#define MAX_IEEE_CHAN 256 /* max acceptable IEEE chan # */ 97CTASSERT(MAX_IEEE_CHAN >= 256); 98 99struct sta_table { 100 ieee80211_scan_table_lock_t st_lock; /* on scan table */ 101 TAILQ_HEAD(, sta_entry) st_entry; /* all entries */ 102 LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE]; 103 struct mtx st_scanlock; /* on st_scaniter */ 104 u_int st_scaniter; /* gen# for iterator */ 105 u_int st_scangen; /* scan generation # */ 106 int st_newscan; 107 /* ap-related state */ 108 int st_maxrssi[MAX_IEEE_CHAN]; 109}; 110 111static void sta_flush_table(struct sta_table *); 112/* 113 * match_bss returns a bitmask describing if an entry is suitable 114 * for use. If non-zero the entry was deemed not suitable and it's 115 * contents explains why. The following flags are or'd to to this 116 * mask and can be used to figure out why the entry was rejected. 117 */ 118#define MATCH_CHANNEL 0x00001 /* channel mismatch */ 119#define MATCH_CAPINFO 0x00002 /* capabilities mismatch, e.g. no ess */ 120#define MATCH_PRIVACY 0x00004 /* privacy mismatch */ 121#define MATCH_RATE 0x00008 /* rate set mismatch */ 122#define MATCH_SSID 0x00010 /* ssid mismatch */ 123#define MATCH_BSSID 0x00020 /* bssid mismatch */ 124#define MATCH_FAILS 0x00040 /* too many failed auth attempts */ 125#define MATCH_NOTSEEN 0x00080 /* not seen in recent scans */ 126#define MATCH_RSSI 0x00100 /* rssi deemed too low to use */ 127#define MATCH_CC 0x00200 /* country code mismatch */ 128#define MATCH_TDMA_NOIE 0x00400 /* no TDMA ie */ 129#define MATCH_TDMA_NOTMASTER 0x00800 /* not TDMA master */ 130#define MATCH_TDMA_NOSLOT 0x01000 /* all TDMA slots occupied */ 131#define MATCH_TDMA_LOCAL 0x02000 /* local address */ 132#define MATCH_TDMA_VERSION 0x04000 /* protocol version mismatch */ 133#define MATCH_MESH_NOID 0x10000 /* no MESHID ie */ 134#define MATCH_MESHID 0x20000 /* meshid mismatch */ 135static int match_bss(struct ieee80211vap *, 136 const struct ieee80211_scan_state *, struct sta_entry *, int); 137static void adhoc_age(struct ieee80211_scan_state *); 138 139static __inline int 140isocmp(const uint8_t cc1[], const uint8_t cc2[]) 141{ 142 return (cc1[0] == cc2[0] && cc1[1] == cc2[1]); 143} 144 145/* number of references from net80211 layer */ 146static int nrefs = 0; 147/* 148 * Module glue. 149 */ 150IEEE80211_SCANNER_MODULE(sta, 1); 151 152/* 153 * Attach prior to any scanning work. 154 */ 155static int 156sta_attach(struct ieee80211_scan_state *ss) 157{ 158 struct sta_table *st; 159 160 st = (struct sta_table *) malloc(sizeof(struct sta_table), 161 M_80211_SCAN, M_NOWAIT | M_ZERO); 162 if (st == NULL) 163 return 0; 164 IEEE80211_SCAN_TABLE_LOCK_INIT(st, "scantable"); 165 mtx_init(&st->st_scanlock, "scangen", "802.11 scangen", MTX_DEF); 166 TAILQ_INIT(&st->st_entry); 167 ss->ss_priv = st; 168 nrefs++; /* NB: we assume caller locking */ 169 return 1; 170} 171 172/* 173 * Cleanup any private state. 174 */ 175static int 176sta_detach(struct ieee80211_scan_state *ss) 177{ 178 struct sta_table *st = ss->ss_priv; 179 180 if (st != NULL) { 181 sta_flush_table(st); 182 IEEE80211_SCAN_TABLE_LOCK_DESTROY(st); 183 mtx_destroy(&st->st_scanlock); 184 free(st, M_80211_SCAN); 185 KASSERT(nrefs > 0, ("imbalanced attach/detach")); 186 nrefs--; /* NB: we assume caller locking */ 187 } 188 return 1; 189} 190 191/* 192 * Flush all per-scan state. 193 */ 194static int 195sta_flush(struct ieee80211_scan_state *ss) 196{ 197 struct sta_table *st = ss->ss_priv; 198 199 IEEE80211_SCAN_TABLE_LOCK(st); 200 sta_flush_table(st); 201 IEEE80211_SCAN_TABLE_UNLOCK(st); 202 ss->ss_last = 0; 203 return 0; 204} 205 206/* 207 * Flush all entries in the scan cache. 208 */ 209static void 210sta_flush_table(struct sta_table *st) 211{ 212 struct sta_entry *se, *next; 213 214 TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 215 TAILQ_REMOVE(&st->st_entry, se, se_list); 216 LIST_REMOVE(se, se_hash); 217 ieee80211_ies_cleanup(&se->base.se_ies); 218 free(se, M_80211_SCAN); 219 } 220 memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi)); 221} 222 223/* 224 * Process a beacon or probe response frame; create an 225 * entry in the scan cache or update any previous entry. 226 */ 227static int 228sta_add(struct ieee80211_scan_state *ss, 229 const struct ieee80211_scanparams *sp, 230 const struct ieee80211_frame *wh, 231 int subtype, int rssi, int noise) 232{ 233#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 234#define PICK1ST(_ss) \ 235 ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \ 236 IEEE80211_SCAN_PICK1ST) 237 struct sta_table *st = ss->ss_priv; 238 const uint8_t *macaddr = wh->i_addr2; 239 struct ieee80211vap *vap = ss->ss_vap; 240 struct ieee80211com *ic = vap->iv_ic; 241 struct sta_entry *se; 242 struct ieee80211_scan_entry *ise; 243 int hash; 244 245 hash = STA_HASH(macaddr); 246 247 IEEE80211_SCAN_TABLE_LOCK(st); 248 LIST_FOREACH(se, &st->st_hash[hash], se_hash) 249 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 250 goto found; 251 se = (struct sta_entry *) malloc(sizeof(struct sta_entry), 252 M_80211_SCAN, M_NOWAIT | M_ZERO); 253 if (se == NULL) { 254 IEEE80211_SCAN_TABLE_UNLOCK(st); 255 return 0; 256 } 257 se->se_scangen = st->st_scaniter-1; 258 se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER; 259 IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr); 260 TAILQ_INSERT_TAIL(&st->st_entry, se, se_list); 261 LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash); 262found: 263 ise = &se->base; 264 /* XXX ap beaconing multiple ssid w/ same bssid */ 265 if (sp->ssid[1] != 0 && 266 (ISPROBE(subtype) || ise->se_ssid[1] == 0)) 267 memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]); 268 KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE, 269 ("rate set too large: %u", sp->rates[1])); 270 memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]); 271 if (sp->xrates != NULL) { 272 /* XXX validate xrates[1] */ 273 KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE, 274 ("xrate set too large: %u", sp->xrates[1])); 275 memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]); 276 } else 277 ise->se_xrates[1] = 0; 278 IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3); 279 if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) { 280 /* 281 * Record rssi data using extended precision LPF filter. 282 * 283 * NB: use only on-channel data to insure we get a good 284 * estimate of the signal we'll see when associated. 285 */ 286 IEEE80211_RSSI_LPF(se->se_avgrssi, rssi); 287 ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi); 288 ise->se_noise = noise; 289 } 290 memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp)); 291 ise->se_intval = sp->bintval; 292 ise->se_capinfo = sp->capinfo; 293#ifdef IEEE80211_SUPPORT_MESH 294 if (sp->meshid != NULL && sp->meshid[1] != 0) 295 memcpy(ise->se_meshid, sp->meshid, 2+sp->meshid[1]); 296#endif 297 /* 298 * Beware of overriding se_chan for frames seen 299 * off-channel; this can cause us to attempt an 300 * association on the wrong channel. 301 */ 302 if (sp->status & IEEE80211_BPARSE_OFFCHAN) { 303 struct ieee80211_channel *c; 304 /* 305 * Off-channel, locate the home/bss channel for the sta 306 * using the value broadcast in the DSPARMS ie. We know 307 * sp->chan has this value because it's used to calculate 308 * IEEE80211_BPARSE_OFFCHAN. 309 */ 310 c = ieee80211_find_channel_byieee(ic, sp->chan, 311 ic->ic_curchan->ic_flags); 312 if (c != NULL) { 313 ise->se_chan = c; 314 } else if (ise->se_chan == NULL) { 315 /* should not happen, pick something */ 316 ise->se_chan = ic->ic_curchan; 317 } 318 } else 319 ise->se_chan = ic->ic_curchan; 320 ise->se_fhdwell = sp->fhdwell; 321 ise->se_fhindex = sp->fhindex; 322 ise->se_erp = sp->erp; 323 ise->se_timoff = sp->timoff; 324 if (sp->tim != NULL) { 325 const struct ieee80211_tim_ie *tim = 326 (const struct ieee80211_tim_ie *) sp->tim; 327 ise->se_dtimperiod = tim->tim_period; 328 } 329 if (sp->country != NULL) { 330 const struct ieee80211_country_ie *cie = 331 (const struct ieee80211_country_ie *) sp->country; 332 /* 333 * If 11d is enabled and we're attempting to join a bss 334 * that advertises it's country code then compare our 335 * current settings to what we fetched from the country ie. 336 * If our country code is unspecified or different then 337 * dispatch an event to user space that identifies the 338 * country code so our regdomain config can be changed. 339 */ 340 /* XXX only for STA mode? */ 341 if ((IEEE80211_IS_CHAN_11D(ise->se_chan) || 342 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 343 (ic->ic_regdomain.country == CTRY_DEFAULT || 344 !isocmp(cie->cc, ic->ic_regdomain.isocc))) { 345 /* only issue one notify event per scan */ 346 if (se->se_countrygen != st->st_scangen) { 347 ieee80211_notify_country(vap, ise->se_bssid, 348 cie->cc); 349 se->se_countrygen = st->st_scangen; 350 } 351 } 352 ise->se_cc[0] = cie->cc[0]; 353 ise->se_cc[1] = cie->cc[1]; 354 } 355 /* NB: no need to setup ie ptrs; they are not (currently) used */ 356 (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len); 357 358 /* clear failure count after STA_FAIL_AGE passes */ 359 if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) { 360 se->se_fails = 0; 361 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr, 362 "%s: fails %u", __func__, se->se_fails); 363 } 364 365 se->se_lastupdate = ticks; /* update time */ 366 se->se_seen = 1; 367 se->se_notseen = 0; 368 369 KASSERT(sizeof(sp->bchan) == 1, ("bchan size")); 370 if (rssi > st->st_maxrssi[sp->bchan]) 371 st->st_maxrssi[sp->bchan] = rssi; 372 373 IEEE80211_SCAN_TABLE_UNLOCK(st); 374 375 /* 376 * If looking for a quick choice and nothing's 377 * been found check here. 378 */ 379 if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0) 380 ss->ss_flags |= IEEE80211_SCAN_GOTPICK; 381 382 return 1; 383#undef PICK1ST 384#undef ISPROBE 385} 386 387/* 388 * Check if a channel is excluded by user request. 389 */ 390static int 391isexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c) 392{ 393 return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) || 394 (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 395 c->ic_freq != vap->iv_des_chan->ic_freq)); 396} 397 398static struct ieee80211_channel * 399find11gchannel(struct ieee80211com *ic, int i, int freq) 400{ 401 struct ieee80211_channel *c; 402 int j; 403 404 /* 405 * The normal ordering in the channel list is b channel 406 * immediately followed by g so optimize the search for 407 * this. We'll still do a full search just in case. 408 */ 409 for (j = i+1; j < ic->ic_nchans; j++) { 410 c = &ic->ic_channels[j]; 411 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 412 return c; 413 } 414 for (j = 0; j < i; j++) { 415 c = &ic->ic_channels[j]; 416 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 417 return c; 418 } 419 return NULL; 420} 421 422static const u_int chanflags[IEEE80211_MODE_MAX] = { 423 [IEEE80211_MODE_AUTO] = IEEE80211_CHAN_B, 424 [IEEE80211_MODE_11A] = IEEE80211_CHAN_A, 425 [IEEE80211_MODE_11B] = IEEE80211_CHAN_B, 426 [IEEE80211_MODE_11G] = IEEE80211_CHAN_G, 427 [IEEE80211_MODE_FH] = IEEE80211_CHAN_FHSS, 428 /* check base channel */ 429 [IEEE80211_MODE_TURBO_A] = IEEE80211_CHAN_A, 430 [IEEE80211_MODE_TURBO_G] = IEEE80211_CHAN_G, 431 [IEEE80211_MODE_STURBO_A] = IEEE80211_CHAN_ST, 432 [IEEE80211_MODE_HALF] = IEEE80211_CHAN_HALF, 433 [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_QUARTER, 434 /* check legacy */ 435 [IEEE80211_MODE_11NA] = IEEE80211_CHAN_A, 436 [IEEE80211_MODE_11NG] = IEEE80211_CHAN_G, 437}; 438 439static void 440add_channels(struct ieee80211vap *vap, 441 struct ieee80211_scan_state *ss, 442 enum ieee80211_phymode mode, const uint16_t freq[], int nfreq) 443{ 444#define N(a) (sizeof(a) / sizeof(a[0])) 445 struct ieee80211com *ic = vap->iv_ic; 446 struct ieee80211_channel *c, *cg; 447 u_int modeflags; 448 int i; 449 450 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 451 modeflags = chanflags[mode]; 452 for (i = 0; i < nfreq; i++) { 453 if (ss->ss_last >= IEEE80211_SCAN_MAX) 454 break; 455 456 c = ieee80211_find_channel(ic, freq[i], modeflags); 457 if (c == NULL || isexcluded(vap, c)) 458 continue; 459 if (mode == IEEE80211_MODE_AUTO) { 460 /* 461 * XXX special-case 11b/g channels so we select 462 * the g channel if both are present. 463 */ 464 if (IEEE80211_IS_CHAN_B(c) && 465 (cg = find11gchannel(ic, i, c->ic_freq)) != NULL) 466 c = cg; 467 } 468 ss->ss_chans[ss->ss_last++] = c; 469 } 470#undef N 471} 472 473struct scanlist { 474 uint16_t mode; 475 uint16_t count; 476 const uint16_t *list; 477}; 478 479static int 480checktable(const struct scanlist *scan, const struct ieee80211_channel *c) 481{ 482 int i; 483 484 for (; scan->list != NULL; scan++) { 485 for (i = 0; i < scan->count; i++) 486 if (scan->list[i] == c->ic_freq) 487 return 1; 488 } 489 return 0; 490} 491 492static int 493onscanlist(const struct ieee80211_scan_state *ss, 494 const struct ieee80211_channel *c) 495{ 496 int i; 497 498 for (i = 0; i < ss->ss_last; i++) 499 if (ss->ss_chans[i] == c) 500 return 1; 501 return 0; 502} 503 504static void 505sweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 506 const struct scanlist table[]) 507{ 508 struct ieee80211com *ic = vap->iv_ic; 509 struct ieee80211_channel *c; 510 int i; 511 512 for (i = 0; i < ic->ic_nchans; i++) { 513 if (ss->ss_last >= IEEE80211_SCAN_MAX) 514 break; 515 516 c = &ic->ic_channels[i]; 517 /* 518 * Ignore dynamic turbo channels; we scan them 519 * in normal mode (i.e. not boosted). Likewise 520 * for HT channels, they get scanned using 521 * legacy rates. 522 */ 523 if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c)) 524 continue; 525 526 /* 527 * If a desired mode was specified, scan only 528 * channels that satisfy that constraint. 529 */ 530 if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 531 vap->iv_des_mode != ieee80211_chan2mode(c)) 532 continue; 533 534 /* 535 * Skip channels excluded by user request. 536 */ 537 if (isexcluded(vap, c)) 538 continue; 539 540 /* 541 * Add the channel unless it is listed in the 542 * fixed scan order tables. This insures we 543 * don't sweep back in channels we filtered out 544 * above. 545 */ 546 if (checktable(table, c)) 547 continue; 548 549 /* Add channel to scanning list. */ 550 ss->ss_chans[ss->ss_last++] = c; 551 } 552 /* 553 * Explicitly add any desired channel if: 554 * - not already on the scan list 555 * - allowed by any desired mode constraint 556 * - there is space in the scan list 557 * This allows the channel to be used when the filtering 558 * mechanisms would otherwise elide it (e.g HT, turbo). 559 */ 560 c = vap->iv_des_chan; 561 if (c != IEEE80211_CHAN_ANYC && 562 !onscanlist(ss, c) && 563 (vap->iv_des_mode == IEEE80211_MODE_AUTO || 564 vap->iv_des_mode == ieee80211_chan2mode(c)) && 565 ss->ss_last < IEEE80211_SCAN_MAX) 566 ss->ss_chans[ss->ss_last++] = c; 567} 568 569static void 570makescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 571 const struct scanlist table[]) 572{ 573 const struct scanlist *scan; 574 enum ieee80211_phymode mode; 575 576 ss->ss_last = 0; 577 /* 578 * Use the table of ordered channels to construct the list 579 * of channels for scanning. Any channels in the ordered 580 * list not in the master list will be discarded. 581 */ 582 for (scan = table; scan->list != NULL; scan++) { 583 mode = scan->mode; 584 if (vap->iv_des_mode != IEEE80211_MODE_AUTO) { 585 /* 586 * If a desired mode was specified, scan only 587 * channels that satisfy that constraint. 588 */ 589 if (vap->iv_des_mode != mode) { 590 /* 591 * The scan table marks 2.4Ghz channels as b 592 * so if the desired mode is 11g, then use 593 * the 11b channel list but upgrade the mode. 594 */ 595 if (vap->iv_des_mode != IEEE80211_MODE_11G || 596 mode != IEEE80211_MODE_11B) 597 continue; 598 mode = IEEE80211_MODE_11G; /* upgrade */ 599 } 600 } else { 601 /* 602 * This lets add_channels upgrade an 11b channel 603 * to 11g if available. 604 */ 605 if (mode == IEEE80211_MODE_11B) 606 mode = IEEE80211_MODE_AUTO; 607 } 608#ifdef IEEE80211_F_XR 609 /* XR does not operate on turbo channels */ 610 if ((vap->iv_flags & IEEE80211_F_XR) && 611 (mode == IEEE80211_MODE_TURBO_A || 612 mode == IEEE80211_MODE_TURBO_G || 613 mode == IEEE80211_MODE_STURBO_A)) 614 continue; 615#endif 616 /* 617 * Add the list of the channels; any that are not 618 * in the master channel list will be discarded. 619 */ 620 add_channels(vap, ss, mode, scan->list, scan->count); 621 } 622 623 /* 624 * Add the channels from the ic that are not present 625 * in the table. 626 */ 627 sweepchannels(ss, vap, table); 628} 629 630static const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 631{ 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 632static const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 633{ 5170, 5190, 5210, 5230 }; 634static const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 635{ 2412, 2437, 2462, 2442, 2472 }; 636static const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 637{ 5745, 5765, 5785, 5805, 5825 }; 638static const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ 639{ 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; 640static const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 641{ 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 642static const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 643{ 2484 }; 644static const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 645{ 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 646static const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ 647{ 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; 648#ifdef ATH_TURBO_SCAN 649static const uint16_t rcl5[] = /* 3 static turbo channels */ 650{ 5210, 5250, 5290 }; 651static const uint16_t rcl6[] = /* 2 static turbo channels */ 652{ 5760, 5800 }; 653static const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 654{ 5540, 5580, 5620, 5660 }; 655static const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 656{ 2437 }; 657static const uint16_t rcl13[] = /* dynamic Turbo channels */ 658{ 5200, 5240, 5280, 5765, 5805 }; 659#endif /* ATH_TURBO_SCAN */ 660 661#define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a 662 663static const struct scanlist staScanTable[] = { 664 { IEEE80211_MODE_11B, X(rcl3) }, 665 { IEEE80211_MODE_11A, X(rcl1) }, 666 { IEEE80211_MODE_11A, X(rcl2) }, 667 { IEEE80211_MODE_11B, X(rcl8) }, 668 { IEEE80211_MODE_11B, X(rcl9) }, 669 { IEEE80211_MODE_11A, X(rcl4) }, 670#ifdef ATH_TURBO_SCAN 671 { IEEE80211_MODE_STURBO_A, X(rcl5) }, 672 { IEEE80211_MODE_STURBO_A, X(rcl6) }, 673 { IEEE80211_MODE_TURBO_A, X(rcl6x) }, 674 { IEEE80211_MODE_TURBO_A, X(rcl13) }, 675#endif /* ATH_TURBO_SCAN */ 676 { IEEE80211_MODE_11A, X(rcl7) }, 677 { IEEE80211_MODE_11B, X(rcl10) }, 678 { IEEE80211_MODE_11A, X(rcl11) }, 679#ifdef ATH_TURBO_SCAN 680 { IEEE80211_MODE_TURBO_G, X(rcl12) }, 681#endif /* ATH_TURBO_SCAN */ 682 { .list = NULL } 683}; 684 685/* 686 * Start a station-mode scan by populating the channel list. 687 */ 688static int 689sta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 690{ 691 struct sta_table *st = ss->ss_priv; 692 693 makescanlist(ss, vap, staScanTable); 694 695 if (ss->ss_mindwell == 0) 696 ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ 697 if (ss->ss_maxdwell == 0) 698 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 699 700 st->st_scangen++; 701 st->st_newscan = 1; 702 703 return 0; 704} 705 706/* 707 * Restart a scan, typically a bg scan but can 708 * also be a fg scan that came up empty. 709 */ 710static int 711sta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 712{ 713 struct sta_table *st = ss->ss_priv; 714 715 st->st_newscan = 1; 716 return 0; 717} 718 719/* 720 * Cancel an ongoing scan. 721 */ 722static int 723sta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 724{ 725 return 0; 726} 727 728/* unalligned little endian access */ 729#define LE_READ_2(p) \ 730 ((uint16_t) \ 731 ((((const uint8_t *)(p))[0] ) | \ 732 (((const uint8_t *)(p))[1] << 8))) 733 734/* 735 * Demote any supplied 11g channel to 11b. There should 736 * always be an 11b channel but we check anyway... 737 */ 738static struct ieee80211_channel * 739demote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan) 740{ 741 struct ieee80211_channel *c; 742 743 if (IEEE80211_IS_CHAN_ANYG(chan) && 744 vap->iv_des_mode == IEEE80211_MODE_AUTO) { 745 c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq, 746 (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) | 747 IEEE80211_CHAN_B); 748 if (c != NULL) 749 chan = c; 750 } 751 return chan; 752} 753 754static int 755maxrate(const struct ieee80211_scan_entry *se) 756{ 757 const struct ieee80211_ie_htcap *htcap = 758 (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie; 759 int rmax, r, i; 760 uint16_t caps; 761 762 rmax = 0; 763 if (htcap != NULL) { 764 /* 765 * HT station; inspect supported MCS and then adjust 766 * rate by channel width. Could also include short GI 767 * in this if we want to be extra accurate. 768 */ 769 /* XXX assumes MCS15 is max */ 770 for (i = 15; i >= 0 && isclr(htcap->hc_mcsset, i); i--) 771 ; 772 if (i >= 0) { 773 caps = LE_READ_2(&htcap->hc_cap); 774 /* XXX short/long GI */ 775 if (caps & IEEE80211_HTCAP_CHWIDTH40) 776 rmax = ieee80211_htrates[i].ht40_rate_400ns; 777 else 778 rmax = ieee80211_htrates[i].ht40_rate_800ns; 779 } 780 } 781 for (i = 0; i < se->se_rates[1]; i++) { 782 r = se->se_rates[2+i] & IEEE80211_RATE_VAL; 783 if (r > rmax) 784 rmax = r; 785 } 786 for (i = 0; i < se->se_xrates[1]; i++) { 787 r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; 788 if (r > rmax) 789 rmax = r; 790 } 791 return rmax; 792} 793 794/* 795 * Compare the capabilities of two entries and decide which is 796 * more desirable (return >0 if a is considered better). Note 797 * that we assume compatibility/usability has already been checked 798 * so we don't need to (e.g. validate whether privacy is supported). 799 * Used to select the best scan candidate for association in a BSS. 800 */ 801static int 802sta_compare(const struct sta_entry *a, const struct sta_entry *b) 803{ 804#define PREFER(_a,_b,_what) do { \ 805 if (((_a) ^ (_b)) & (_what)) \ 806 return ((_a) & (_what)) ? 1 : -1; \ 807} while (0) 808 int maxa, maxb; 809 int8_t rssia, rssib; 810 int weight; 811 812 /* privacy support */ 813 PREFER(a->base.se_capinfo, b->base.se_capinfo, 814 IEEE80211_CAPINFO_PRIVACY); 815 816 /* compare count of previous failures */ 817 weight = b->se_fails - a->se_fails; 818 if (abs(weight) > 1) 819 return weight; 820 821 /* 822 * Compare rssi. If the two are considered equivalent 823 * then fallback to other criteria. We threshold the 824 * comparisons to avoid selecting an ap purely by rssi 825 * when both values may be good but one ap is otherwise 826 * more desirable (e.g. an 11b-only ap with stronger 827 * signal than an 11g ap). 828 */ 829 rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 830 rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 831 if (abs(rssib - rssia) < 5) { 832 /* best/max rate preferred if signal level close enough XXX */ 833 maxa = maxrate(&a->base); 834 maxb = maxrate(&b->base); 835 if (maxa != maxb) 836 return maxa - maxb; 837 /* XXX use freq for channel preference */ 838 /* for now just prefer 5Ghz band to all other bands */ 839 PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 840 IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 841 } 842 /* all things being equal, use signal level */ 843 return a->base.se_rssi - b->base.se_rssi; 844#undef PREFER 845} 846 847/* 848 * Check rate set suitability and return the best supported rate. 849 * XXX inspect MCS for HT 850 */ 851static int 852check_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, 853 const struct ieee80211_scan_entry *se) 854{ 855#define RV(v) ((v) & IEEE80211_RATE_VAL) 856 const struct ieee80211_rateset *srs; 857 int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 858 const uint8_t *rs; 859 860 okrate = badrate = 0; 861 862 srs = ieee80211_get_suprates(vap->iv_ic, chan); 863 nrs = se->se_rates[1]; 864 rs = se->se_rates+2; 865 /* XXX MCS */ 866 ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; 867 fixedrate = IEEE80211_FIXED_RATE_NONE; 868again: 869 for (i = 0; i < nrs; i++) { 870 r = RV(rs[i]); 871 badrate = r; 872 /* 873 * Check any fixed rate is included. 874 */ 875 if (r == ucastrate) 876 fixedrate = r; 877 /* 878 * Check against our supported rates. 879 */ 880 for (j = 0; j < srs->rs_nrates; j++) 881 if (r == RV(srs->rs_rates[j])) { 882 if (r > okrate) /* NB: track max */ 883 okrate = r; 884 break; 885 } 886 887 if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 888 /* 889 * Don't try joining a BSS, if we don't support 890 * one of its basic rates. 891 */ 892 okrate = 0; 893 goto back; 894 } 895 } 896 if (rs == se->se_rates+2) { 897 /* scan xrates too; sort of an algol68-style for loop */ 898 nrs = se->se_xrates[1]; 899 rs = se->se_xrates+2; 900 goto again; 901 } 902 903back: 904 if (okrate == 0 || ucastrate != fixedrate) 905 return badrate | IEEE80211_RATE_BASIC; 906 else 907 return RV(okrate); 908#undef RV 909} 910 911static __inline int 912match_id(const uint8_t *ie, const uint8_t *val, int len) 913{ 914 return (ie[1] == len && memcmp(ie+2, val, len) == 0); 915} 916 917static int 918match_ssid(const uint8_t *ie, 919 int nssid, const struct ieee80211_scan_ssid ssids[]) 920{ 921 int i; 922 923 for (i = 0; i < nssid; i++) { 924 if (match_id(ie, ssids[i].ssid, ssids[i].len)) 925 return 1; 926 } 927 return 0; 928} 929 930#ifdef IEEE80211_SUPPORT_TDMA 931static int 932tdma_isfull(const struct ieee80211_tdma_param *tdma) 933{ 934 int slot, slotcnt; 935 936 slotcnt = tdma->tdma_slotcnt; 937 for (slot = slotcnt-1; slot >= 0; slot--) 938 if (isclr(tdma->tdma_inuse, slot)) 939 return 0; 940 return 1; 941} 942#endif /* IEEE80211_SUPPORT_TDMA */ 943 944/* 945 * Test a scan candidate for suitability/compatibility. 946 */ 947static int 948match_bss(struct ieee80211vap *vap, 949 const struct ieee80211_scan_state *ss, struct sta_entry *se0, 950 int debug) 951{ 952 struct ieee80211com *ic = vap->iv_ic; 953 struct ieee80211_scan_entry *se = &se0->base; 954 uint8_t rate; 955 int fail; 956 957 fail = 0; 958 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 959 fail |= MATCH_CHANNEL; 960 /* 961 * NB: normally the desired mode is used to construct 962 * the channel list, but it's possible for the scan 963 * cache to include entries for stations outside this 964 * list so we check the desired mode here to weed them 965 * out. 966 */ 967 if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 968 (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 969 chanflags[vap->iv_des_mode]) 970 fail |= MATCH_CHANNEL; 971 if (vap->iv_opmode == IEEE80211_M_IBSS) { 972 if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 973 fail |= MATCH_CAPINFO; 974#ifdef IEEE80211_SUPPORT_TDMA 975 } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) { 976 /* 977 * Adhoc demo network setup shouldn't really be scanning 978 * but just in case skip stations operating in IBSS or 979 * BSS mode. 980 */ 981 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 982 fail |= MATCH_CAPINFO; 983 /* 984 * TDMA operation cannot coexist with a normal 802.11 network; 985 * skip if IBSS or ESS capabilities are marked and require 986 * the beacon have a TDMA ie present. 987 */ 988 if (vap->iv_caps & IEEE80211_C_TDMA) { 989 const struct ieee80211_tdma_param *tdma = 990 (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie; 991 const struct ieee80211_tdma_state *ts = vap->iv_tdma; 992 993 if (tdma == NULL) 994 fail |= MATCH_TDMA_NOIE; 995 else if (tdma->tdma_version != ts->tdma_version) 996 fail |= MATCH_TDMA_VERSION; 997 else if (tdma->tdma_slot != 0) 998 fail |= MATCH_TDMA_NOTMASTER; 999 else if (tdma_isfull(tdma)) 1000 fail |= MATCH_TDMA_NOSLOT; 1001#if 0 1002 else if (ieee80211_local_address(se->se_macaddr)) 1003 fail |= MATCH_TDMA_LOCAL; 1004#endif 1005 } 1006#endif /* IEEE80211_SUPPORT_TDMA */ 1007#ifdef IEEE80211_SUPPORT_MESH 1008 } else if (vap->iv_opmode == IEEE80211_M_MBSS) { 1009 const struct ieee80211_mesh_state *ms = vap->iv_mesh; 1010 /* 1011 * Mesh nodes have IBSS & ESS bits in capinfo turned off 1012 * and two special ie's that must be present. 1013 */ 1014 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1015 fail |= MATCH_CAPINFO; 1016 else if (&se->se_meshid == NULL) 1017 fail |= MATCH_MESH_NOID; 1018 else if (ms->ms_idlen != 0 && 1019 match_id(se->se_meshid, ms->ms_id, ms->ms_idlen)) 1020 fail |= MATCH_MESHID; 1021#endif 1022 } else { 1023 if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 1024 fail |= MATCH_CAPINFO; 1025 /* 1026 * If 11d is enabled and we're attempting to join a bss 1027 * that advertises it's country code then compare our 1028 * current settings to what we fetched from the country ie. 1029 * If our country code is unspecified or different then do 1030 * not attempt to join the bss. We should have already 1031 * dispatched an event to user space that identifies the 1032 * new country code so our regdomain config should match. 1033 */ 1034 if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 1035 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 1036 se->se_cc[0] != 0 && 1037 (ic->ic_regdomain.country == CTRY_DEFAULT || 1038 !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 1039 fail |= MATCH_CC; 1040 } 1041 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1042 if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 1043 fail |= MATCH_PRIVACY; 1044 } else { 1045 /* XXX does this mean privacy is supported or required? */ 1046 if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 1047 fail |= MATCH_PRIVACY; 1048 } 1049 se0->se_flags &= ~STA_DEMOTE11B; 1050 rate = check_rate(vap, se->se_chan, se); 1051 if (rate & IEEE80211_RATE_BASIC) { 1052 fail |= MATCH_RATE; 1053 /* 1054 * An 11b-only ap will give a rate mismatch if there is an 1055 * OFDM fixed tx rate for 11g. Try downgrading the channel 1056 * in the scan list to 11b and retry the rate check. 1057 */ 1058 if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { 1059 rate = check_rate(vap, demote11b(vap, se->se_chan), se); 1060 if ((rate & IEEE80211_RATE_BASIC) == 0) { 1061 fail &= ~MATCH_RATE; 1062 se0->se_flags |= STA_DEMOTE11B; 1063 } 1064 } 1065 } else if (rate < 2*24) { 1066 /* 1067 * This is an 11b-only ap. Check the desired mode in 1068 * case that needs to be honored (mode 11g filters out 1069 * 11b-only ap's). Otherwise force any 11g channel used 1070 * in scanning to be demoted. 1071 * 1072 * NB: we cheat a bit here by looking at the max rate; 1073 * we could/should check the rates. 1074 */ 1075 if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || 1076 vap->iv_des_mode == IEEE80211_MODE_11B)) 1077 fail |= MATCH_RATE; 1078 else 1079 se0->se_flags |= STA_DEMOTE11B; 1080 } 1081 if (ss->ss_nssid != 0 && 1082 !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 1083 fail |= MATCH_SSID; 1084 if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 1085 !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 1086 fail |= MATCH_BSSID; 1087 if (se0->se_fails >= STA_FAILS_MAX) 1088 fail |= MATCH_FAILS; 1089 if (se0->se_notseen >= STA_PURGE_SCANS) 1090 fail |= MATCH_NOTSEEN; 1091 if (se->se_rssi < STA_RSSI_MIN) 1092 fail |= MATCH_RSSI; 1093#ifdef IEEE80211_DEBUG 1094 if (ieee80211_msg(vap, debug)) { 1095 printf(" %c %s", 1096 fail & MATCH_FAILS ? '=' : 1097 fail & MATCH_NOTSEEN ? '^' : 1098 fail & MATCH_CC ? '$' : 1099#ifdef IEEE80211_SUPPORT_TDMA 1100 fail & MATCH_TDMA_NOIE ? '&' : 1101 fail & MATCH_TDMA_VERSION ? 'v' : 1102 fail & MATCH_TDMA_NOTMASTER ? 's' : 1103 fail & MATCH_TDMA_NOSLOT ? 'f' : 1104 fail & MATCH_TDMA_LOCAL ? 'l' : 1105#endif 1106 fail & MATCH_MESH_NOID ? 'm' : 1107 fail ? '-' : '+', ether_sprintf(se->se_macaddr)); 1108 printf(" %s%c", ether_sprintf(se->se_bssid), 1109 fail & MATCH_BSSID ? '!' : ' '); 1110 printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 1111 fail & MATCH_CHANNEL ? '!' : ' '); 1112 printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 1113 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1114 fail & MATCH_RATE ? '!' : ' '); 1115 printf(" %4s%c", 1116 (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1117 (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "", 1118 fail & MATCH_CAPINFO ? '!' : ' '); 1119 printf(" %3s%c ", 1120 (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1121 "wep" : "no", 1122 fail & MATCH_PRIVACY ? '!' : ' '); 1123 ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 1124 printf("%s\n", fail & (MATCH_SSID | MATCH_MESHID) ? "!" : ""); 1125 } 1126#endif 1127 return fail; 1128} 1129 1130static void 1131sta_update_notseen(struct sta_table *st) 1132{ 1133 struct sta_entry *se; 1134 1135 IEEE80211_SCAN_TABLE_LOCK(st); 1136 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1137 /* 1138 * If seen the reset and don't bump the count; 1139 * otherwise bump the ``not seen'' count. Note 1140 * that this insures that stations for which we 1141 * see frames while not scanning but not during 1142 * this scan will not be penalized. 1143 */ 1144 if (se->se_seen) 1145 se->se_seen = 0; 1146 else 1147 se->se_notseen++; 1148 } 1149 IEEE80211_SCAN_TABLE_UNLOCK(st); 1150} 1151 1152static void 1153sta_dec_fails(struct sta_table *st) 1154{ 1155 struct sta_entry *se; 1156 1157 IEEE80211_SCAN_TABLE_LOCK(st); 1158 TAILQ_FOREACH(se, &st->st_entry, se_list) 1159 if (se->se_fails) 1160 se->se_fails--; 1161 IEEE80211_SCAN_TABLE_UNLOCK(st); 1162} 1163 1164static struct sta_entry * 1165select_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 1166{ 1167 struct sta_table *st = ss->ss_priv; 1168 struct sta_entry *se, *selbs = NULL; 1169 1170 IEEE80211_DPRINTF(vap, debug, " %s\n", 1171 "macaddr bssid chan rssi rate flag wep essid"); 1172 IEEE80211_SCAN_TABLE_LOCK(st); 1173 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1174 ieee80211_ies_expand(&se->base.se_ies); 1175 if (match_bss(vap, ss, se, debug) == 0) { 1176 if (selbs == NULL) 1177 selbs = se; 1178 else if (sta_compare(se, selbs) > 0) 1179 selbs = se; 1180 } 1181 } 1182 IEEE80211_SCAN_TABLE_UNLOCK(st); 1183 1184 return selbs; 1185} 1186 1187/* 1188 * Pick an ap or ibss network to join or find a channel 1189 * to use to start an ibss network. 1190 */ 1191static int 1192sta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1193{ 1194 struct sta_table *st = ss->ss_priv; 1195 struct sta_entry *selbs; 1196 struct ieee80211_channel *chan; 1197 1198 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1199 ("wrong mode %u", vap->iv_opmode)); 1200 1201 if (st->st_newscan) { 1202 sta_update_notseen(st); 1203 st->st_newscan = 0; 1204 } 1205 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1206 /* 1207 * Manual/background scan, don't select+join the 1208 * bss, just return. The scanning framework will 1209 * handle notification that this has completed. 1210 */ 1211 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1212 return 1; 1213 } 1214 /* 1215 * Automatic sequencing; look for a candidate and 1216 * if found join the network. 1217 */ 1218 /* NB: unlocked read should be ok */ 1219 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1220 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1221 "%s: no scan candidate\n", __func__); 1222 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1223 return 0; 1224notfound: 1225 /* 1226 * If nothing suitable was found decrement 1227 * the failure counts so entries will be 1228 * reconsidered the next time around. We 1229 * really want to do this only for sta's 1230 * where we've previously had some success. 1231 */ 1232 sta_dec_fails(st); 1233 st->st_newscan = 1; 1234 return 0; /* restart scan */ 1235 } 1236 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1237 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1238 return (selbs != NULL); 1239 if (selbs == NULL) 1240 goto notfound; 1241 chan = selbs->base.se_chan; 1242 if (selbs->se_flags & STA_DEMOTE11B) 1243 chan = demote11b(vap, chan); 1244 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1245 goto notfound; 1246 return 1; /* terminate scan */ 1247} 1248 1249/* 1250 * Lookup an entry in the scan cache. We assume we're 1251 * called from the bottom half or such that we don't need 1252 * to block the bottom half so that it's safe to return 1253 * a reference to an entry w/o holding the lock on the table. 1254 */ 1255static struct sta_entry * 1256sta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1257{ 1258 struct sta_entry *se; 1259 int hash = STA_HASH(macaddr); 1260 1261 IEEE80211_SCAN_TABLE_LOCK(st); 1262 LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1263 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1264 break; 1265 IEEE80211_SCAN_TABLE_UNLOCK(st); 1266 1267 return se; /* NB: unlocked */ 1268} 1269 1270static void 1271sta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1272{ 1273 struct ieee80211com *ic = vap->iv_ic; 1274 struct ieee80211_node *ni = vap->iv_bss; 1275 struct sta_table *st = ss->ss_priv; 1276 enum ieee80211_phymode mode; 1277 struct sta_entry *se, *selbs; 1278 uint8_t roamRate, curRate, ucastRate; 1279 int8_t roamRssi, curRssi; 1280 1281 se = sta_lookup(st, ni->ni_macaddr); 1282 if (se == NULL) { 1283 /* XXX something is wrong */ 1284 return; 1285 } 1286 1287 mode = ieee80211_chan2mode(ic->ic_bsschan); 1288 roamRate = vap->iv_roamparms[mode].rate; 1289 roamRssi = vap->iv_roamparms[mode].rssi; 1290 ucastRate = vap->iv_txparms[mode].ucastrate; 1291 /* NB: the most up to date rssi is in the node, not the scan cache */ 1292 curRssi = ic->ic_node_getrssi(ni); 1293 if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1294 curRate = ni->ni_txrate; 1295 roamRate &= IEEE80211_RATE_VAL; 1296 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1297 "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1298 __func__, curRssi, curRate, roamRssi, roamRate); 1299 } else { 1300 curRate = roamRate; /* NB: insure compare below fails */ 1301 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1302 "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1303 } 1304 /* 1305 * Check if a new ap should be used and switch. 1306 * XXX deauth current ap 1307 */ 1308 if (curRate < roamRate || curRssi < roamRssi) { 1309 if (time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1310 /* 1311 * Scan cache contents are too old; force a scan now 1312 * if possible so we have current state to make a 1313 * decision with. We don't kick off a bg scan if 1314 * we're using dynamic turbo and boosted or if the 1315 * channel is busy. 1316 * XXX force immediate switch on scan complete 1317 */ 1318 if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1319 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)) 1320 ieee80211_bg_scan(vap, 0); 1321 return; 1322 } 1323 se->base.se_rssi = curRssi; 1324 selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1325 if (selbs != NULL && selbs != se) { 1326 struct ieee80211_channel *chan; 1327 1328 IEEE80211_DPRINTF(vap, 1329 IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1330 "%s: ROAM: curRate %u, roamRate %u, " 1331 "curRssi %d, roamRssi %d\n", __func__, 1332 curRate, roamRate, curRssi, roamRssi); 1333 1334 chan = selbs->base.se_chan; 1335 if (selbs->se_flags & STA_DEMOTE11B) 1336 chan = demote11b(vap, chan); 1337 (void) ieee80211_sta_join(vap, chan, &selbs->base); 1338 } 1339 } 1340} 1341 1342/* 1343 * Age entries in the scan cache. 1344 * XXX also do roaming since it's convenient 1345 */ 1346static void 1347sta_age(struct ieee80211_scan_state *ss) 1348{ 1349 struct ieee80211vap *vap = ss->ss_vap; 1350 1351 adhoc_age(ss); 1352 /* 1353 * If rate control is enabled check periodically to see if 1354 * we should roam from our current connection to one that 1355 * might be better. This only applies when we're operating 1356 * in sta mode and automatic roaming is set. 1357 * XXX defer if busy 1358 * XXX repeater station 1359 * XXX do when !bgscan? 1360 */ 1361 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1362 ("wrong mode %u", vap->iv_opmode)); 1363 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1364 (vap->iv_ic->ic_flags & IEEE80211_F_BGSCAN) && 1365 vap->iv_state >= IEEE80211_S_RUN) 1366 /* XXX vap is implicit */ 1367 sta_roam_check(ss, vap); 1368} 1369 1370/* 1371 * Iterate over the entries in the scan cache, invoking 1372 * the callback function on each one. 1373 */ 1374static void 1375sta_iterate(struct ieee80211_scan_state *ss, 1376 ieee80211_scan_iter_func *f, void *arg) 1377{ 1378 struct sta_table *st = ss->ss_priv; 1379 struct sta_entry *se; 1380 u_int gen; 1381 1382 mtx_lock(&st->st_scanlock); 1383 gen = st->st_scaniter++; 1384restart: 1385 IEEE80211_SCAN_TABLE_LOCK(st); 1386 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1387 if (se->se_scangen != gen) { 1388 se->se_scangen = gen; 1389 /* update public state */ 1390 se->base.se_age = ticks - se->se_lastupdate; 1391 IEEE80211_SCAN_TABLE_UNLOCK(st); 1392 (*f)(arg, &se->base); 1393 goto restart; 1394 } 1395 } 1396 IEEE80211_SCAN_TABLE_UNLOCK(st); 1397 1398 mtx_unlock(&st->st_scanlock); 1399} 1400 1401static void 1402sta_assoc_fail(struct ieee80211_scan_state *ss, 1403 const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1404{ 1405 struct sta_table *st = ss->ss_priv; 1406 struct sta_entry *se; 1407 1408 se = sta_lookup(st, macaddr); 1409 if (se != NULL) { 1410 se->se_fails++; 1411 se->se_lastfail = ticks; 1412 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1413 macaddr, "%s: reason %u fails %u", 1414 __func__, reason, se->se_fails); 1415 } 1416} 1417 1418static void 1419sta_assoc_success(struct ieee80211_scan_state *ss, 1420 const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1421{ 1422 struct sta_table *st = ss->ss_priv; 1423 struct sta_entry *se; 1424 1425 se = sta_lookup(st, macaddr); 1426 if (se != NULL) { 1427#if 0 1428 se->se_fails = 0; 1429 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1430 macaddr, "%s: fails %u", 1431 __func__, se->se_fails); 1432#endif 1433 se->se_lastassoc = ticks; 1434 } 1435} 1436 1437static const struct ieee80211_scanner sta_default = { 1438 .scan_name = "default", 1439 .scan_attach = sta_attach, 1440 .scan_detach = sta_detach, 1441 .scan_start = sta_start, 1442 .scan_restart = sta_restart, 1443 .scan_cancel = sta_cancel, 1444 .scan_end = sta_pick_bss, 1445 .scan_flush = sta_flush, 1446 .scan_add = sta_add, 1447 .scan_age = sta_age, 1448 .scan_iterate = sta_iterate, 1449 .scan_assoc_fail = sta_assoc_fail, 1450 .scan_assoc_success = sta_assoc_success, 1451}; 1452IEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1453 1454/* 1455 * Adhoc mode-specific support. 1456 */ 1457 1458static const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1459{ 5180, 5200, 5220, 5240 }; 1460static const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1461{ 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1462static const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1463{ 5170, 5190, 5210, 5230 }; 1464static const uint16_t adhoc11b[] = /* 10, 11 */ 1465{ 2457, 2462 }; 1466 1467static const struct scanlist adhocScanTable[] = { 1468 { IEEE80211_MODE_11B, X(adhoc11b) }, 1469 { IEEE80211_MODE_11A, X(adhocWorld) }, 1470 { IEEE80211_MODE_11A, X(adhocFcc3) }, 1471 { IEEE80211_MODE_11B, X(adhocMkk) }, 1472 { .list = NULL } 1473}; 1474#undef X 1475 1476/* 1477 * Start an adhoc-mode scan by populating the channel list. 1478 */ 1479static int 1480adhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1481{ 1482 struct sta_table *st = ss->ss_priv; 1483 1484 makescanlist(ss, vap, adhocScanTable); 1485 1486 if (ss->ss_mindwell == 0) 1487 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1488 if (ss->ss_maxdwell == 0) 1489 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1490 1491 st->st_scangen++; 1492 st->st_newscan = 1; 1493 1494 return 0; 1495} 1496 1497/* 1498 * Select a channel to start an adhoc network on. 1499 * The channel list was populated with appropriate 1500 * channels so select one that looks least occupied. 1501 */ 1502static struct ieee80211_channel * 1503adhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1504{ 1505 struct sta_table *st = ss->ss_priv; 1506 struct sta_entry *se; 1507 struct ieee80211_channel *c, *bestchan; 1508 int i, bestrssi, maxrssi; 1509 1510 bestchan = NULL; 1511 bestrssi = -1; 1512 1513 IEEE80211_SCAN_TABLE_LOCK(st); 1514 for (i = 0; i < ss->ss_last; i++) { 1515 c = ss->ss_chans[i]; 1516 /* never consider a channel with radar */ 1517 if (IEEE80211_IS_CHAN_RADAR(c)) 1518 continue; 1519 /* skip channels disallowed by regulatory settings */ 1520 if (IEEE80211_IS_CHAN_NOADHOC(c)) 1521 continue; 1522 /* check channel attributes for band compatibility */ 1523 if (flags != 0 && (c->ic_flags & flags) != flags) 1524 continue; 1525 maxrssi = 0; 1526 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1527 if (se->base.se_chan != c) 1528 continue; 1529 if (se->base.se_rssi > maxrssi) 1530 maxrssi = se->base.se_rssi; 1531 } 1532 if (bestchan == NULL || maxrssi < bestrssi) 1533 bestchan = c; 1534 } 1535 IEEE80211_SCAN_TABLE_UNLOCK(st); 1536 1537 return bestchan; 1538} 1539 1540/* 1541 * Pick an ibss network to join or find a channel 1542 * to use to start an ibss network. 1543 */ 1544static int 1545adhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1546{ 1547 struct sta_table *st = ss->ss_priv; 1548 struct sta_entry *selbs; 1549 struct ieee80211_channel *chan; 1550 1551 KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1552 vap->iv_opmode == IEEE80211_M_AHDEMO || 1553 vap->iv_opmode == IEEE80211_M_MBSS, 1554 ("wrong opmode %u", vap->iv_opmode)); 1555 1556 if (st->st_newscan) { 1557 sta_update_notseen(st); 1558 st->st_newscan = 0; 1559 } 1560 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1561 /* 1562 * Manual/background scan, don't select+join the 1563 * bss, just return. The scanning framework will 1564 * handle notification that this has completed. 1565 */ 1566 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1567 return 1; 1568 } 1569 /* 1570 * Automatic sequencing; look for a candidate and 1571 * if found join the network. 1572 */ 1573 /* NB: unlocked read should be ok */ 1574 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1575 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1576 "%s: no scan candidate\n", __func__); 1577 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1578 return 0; 1579notfound: 1580 /* NB: never auto-start a tdma network for slot !0 */ 1581#ifdef IEEE80211_SUPPORT_TDMA 1582 if (vap->iv_des_nssid && 1583 ((vap->iv_caps & IEEE80211_C_TDMA) == 0 || 1584 ieee80211_tdma_getslot(vap) == 0)) { 1585#else 1586 if (vap->iv_des_nssid) { 1587#endif 1588 /* 1589 * No existing adhoc network to join and we have 1590 * an ssid; start one up. If no channel was 1591 * specified, try to select a channel. 1592 */ 1593 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1594 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1595 struct ieee80211com *ic = vap->iv_ic; 1596 1597 chan = adhoc_pick_channel(ss, 0); 1598 if (chan != NULL) 1599 chan = ieee80211_ht_adjust_channel(ic, 1600 chan, vap->iv_flags_ht); 1601 } else 1602 chan = vap->iv_des_chan; 1603 if (chan != NULL) { 1604 ieee80211_create_ibss(vap, chan); 1605 return 1; 1606 } 1607 } 1608 /* 1609 * If nothing suitable was found decrement 1610 * the failure counts so entries will be 1611 * reconsidered the next time around. We 1612 * really want to do this only for sta's 1613 * where we've previously had some success. 1614 */ 1615 sta_dec_fails(st); 1616 st->st_newscan = 1; 1617 return 0; /* restart scan */ 1618 } 1619 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1620 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1621 return (selbs != NULL); 1622 if (selbs == NULL) 1623 goto notfound; 1624 chan = selbs->base.se_chan; 1625 if (selbs->se_flags & STA_DEMOTE11B) 1626 chan = demote11b(vap, chan); 1627 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1628 goto notfound; 1629 return 1; /* terminate scan */ 1630} 1631 1632/* 1633 * Age entries in the scan cache. 1634 */ 1635static void 1636adhoc_age(struct ieee80211_scan_state *ss) 1637{ 1638 struct sta_table *st = ss->ss_priv; 1639 struct sta_entry *se, *next; 1640 1641 IEEE80211_SCAN_TABLE_LOCK(st); 1642 TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 1643 if (se->se_notseen > STA_PURGE_SCANS) { 1644 TAILQ_REMOVE(&st->st_entry, se, se_list); 1645 LIST_REMOVE(se, se_hash); 1646 ieee80211_ies_cleanup(&se->base.se_ies); 1647 free(se, M_80211_SCAN); 1648 } 1649 } 1650 IEEE80211_SCAN_TABLE_UNLOCK(st); 1651} 1652 1653static const struct ieee80211_scanner adhoc_default = { 1654 .scan_name = "default", 1655 .scan_attach = sta_attach, 1656 .scan_detach = sta_detach, 1657 .scan_start = adhoc_start, 1658 .scan_restart = sta_restart, 1659 .scan_cancel = sta_cancel, 1660 .scan_end = adhoc_pick_bss, 1661 .scan_flush = sta_flush, 1662 .scan_pickchan = adhoc_pick_channel, 1663 .scan_add = sta_add, 1664 .scan_age = adhoc_age, 1665 .scan_iterate = sta_iterate, 1666 .scan_assoc_fail = sta_assoc_fail, 1667 .scan_assoc_success = sta_assoc_success, 1668}; 1669IEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1670IEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1671 1672static void 1673ap_force_promisc(struct ieee80211com *ic) 1674{ 1675 struct ifnet *ifp = ic->ic_ifp; 1676 1677 IEEE80211_LOCK(ic); 1678 /* set interface into promiscuous mode */ 1679 ifp->if_flags |= IFF_PROMISC; 1680 ieee80211_runtask(ic, &ic->ic_promisc_task); 1681 IEEE80211_UNLOCK(ic); 1682} 1683 1684static void 1685ap_reset_promisc(struct ieee80211com *ic) 1686{ 1687 IEEE80211_LOCK(ic); 1688 ieee80211_syncifflag_locked(ic, IFF_PROMISC); 1689 IEEE80211_UNLOCK(ic); 1690} 1691 1692static int 1693ap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1694{ 1695 struct sta_table *st = ss->ss_priv; 1696 1697 makescanlist(ss, vap, staScanTable); 1698 1699 if (ss->ss_mindwell == 0) 1700 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1701 if (ss->ss_maxdwell == 0) 1702 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1703 1704 st->st_scangen++; 1705 st->st_newscan = 1; 1706 1707 ap_force_promisc(vap->iv_ic); 1708 return 0; 1709} 1710 1711/* 1712 * Cancel an ongoing scan. 1713 */ 1714static int 1715ap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1716{ 1717 ap_reset_promisc(vap->iv_ic); 1718 return 0; 1719} 1720 1721/* 1722 * Pick a quiet channel to use for ap operation. 1723 */ 1724static struct ieee80211_channel * 1725ap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1726{ 1727 struct sta_table *st = ss->ss_priv; 1728 struct ieee80211_channel *bestchan = NULL; 1729 int i; 1730 1731 /* XXX select channel more intelligently, e.g. channel spread, power */ 1732 /* NB: use scan list order to preserve channel preference */ 1733 for (i = 0; i < ss->ss_last; i++) { 1734 struct ieee80211_channel *chan = ss->ss_chans[i]; 1735 /* 1736 * If the channel is unoccupied the max rssi 1737 * should be zero; just take it. Otherwise 1738 * track the channel with the lowest rssi and 1739 * use that when all channels appear occupied. 1740 */ 1741 if (IEEE80211_IS_CHAN_RADAR(chan)) 1742 continue; 1743 if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1744 continue; 1745 /* check channel attributes for band compatibility */ 1746 if (flags != 0 && (chan->ic_flags & flags) != flags) 1747 continue; 1748 KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size")); 1749 /* XXX channel have interference */ 1750 if (st->st_maxrssi[chan->ic_ieee] == 0) { 1751 /* XXX use other considerations */ 1752 return chan; 1753 } 1754 if (bestchan == NULL || 1755 st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1756 bestchan = chan; 1757 } 1758 return bestchan; 1759} 1760 1761/* 1762 * Pick a quiet channel to use for ap operation. 1763 */ 1764static int 1765ap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1766{ 1767 struct ieee80211com *ic = vap->iv_ic; 1768 struct ieee80211_channel *bestchan; 1769 1770 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1771 ("wrong opmode %u", vap->iv_opmode)); 1772 bestchan = ap_pick_channel(ss, 0); 1773 if (bestchan == NULL) { 1774 /* no suitable channel, should not happen */ 1775 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1776 "%s: no suitable channel! (should not happen)\n", __func__); 1777 /* XXX print something? */ 1778 return 0; /* restart scan */ 1779 } 1780 /* 1781 * If this is a dynamic turbo channel, start with the unboosted one. 1782 */ 1783 if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1784 bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1785 bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1786 if (bestchan == NULL) { 1787 /* should never happen ?? */ 1788 return 0; 1789 } 1790 } 1791 ap_reset_promisc(ic); 1792 if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1793 /* 1794 * Manual/background scan, don't select+join the 1795 * bss, just return. The scanning framework will 1796 * handle notification that this has completed. 1797 */ 1798 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1799 return 1; 1800 } 1801 ieee80211_create_ibss(vap, 1802 ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ht)); 1803 return 1; 1804} 1805 1806static const struct ieee80211_scanner ap_default = { 1807 .scan_name = "default", 1808 .scan_attach = sta_attach, 1809 .scan_detach = sta_detach, 1810 .scan_start = ap_start, 1811 .scan_restart = sta_restart, 1812 .scan_cancel = ap_cancel, 1813 .scan_end = ap_end, 1814 .scan_flush = sta_flush, 1815 .scan_pickchan = ap_pick_channel, 1816 .scan_add = sta_add, 1817 .scan_age = adhoc_age, 1818 .scan_iterate = sta_iterate, 1819 .scan_assoc_success = sta_assoc_success, 1820 .scan_assoc_fail = sta_assoc_fail, 1821}; 1822IEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1823 1824#ifdef IEEE80211_SUPPORT_MESH 1825/* 1826 * Pick an mbss network to join or find a channel 1827 * to use to start an mbss network. 1828 */ 1829static int 1830mesh_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1831{ 1832 struct sta_table *st = ss->ss_priv; 1833 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1834 struct sta_entry *selbs; 1835 struct ieee80211_channel *chan; 1836 1837 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1838 ("wrong opmode %u", vap->iv_opmode)); 1839 1840 if (st->st_newscan) { 1841 sta_update_notseen(st); 1842 st->st_newscan = 0; 1843 } 1844 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1845 /* 1846 * Manual/background scan, don't select+join the 1847 * bss, just return. The scanning framework will 1848 * handle notification that this has completed. 1849 */ 1850 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1851 return 1; 1852 } 1853 /* 1854 * Automatic sequencing; look for a candidate and 1855 * if found join the network. 1856 */ 1857 /* NB: unlocked read should be ok */ 1858 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1859 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1860 "%s: no scan candidate\n", __func__); 1861 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1862 return 0; 1863notfound: 1864 if (ms->ms_idlen != 0) { 1865 /* 1866 * No existing mbss network to join and we have 1867 * a meshid; start one up. If no channel was 1868 * specified, try to select a channel. 1869 */ 1870 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1871 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1872 struct ieee80211com *ic = vap->iv_ic; 1873 1874 chan = adhoc_pick_channel(ss, 0); 1875 if (chan != NULL) 1876 chan = ieee80211_ht_adjust_channel(ic, 1877 chan, vap->iv_flags_ht); 1878 } else 1879 chan = vap->iv_des_chan; 1880 if (chan != NULL) { 1881 ieee80211_create_ibss(vap, chan); 1882 return 1; 1883 } 1884 } 1885 /* 1886 * If nothing suitable was found decrement 1887 * the failure counts so entries will be 1888 * reconsidered the next time around. We 1889 * really want to do this only for sta's 1890 * where we've previously had some success. 1891 */ 1892 sta_dec_fails(st); 1893 st->st_newscan = 1; 1894 return 0; /* restart scan */ 1895 } 1896 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1897 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1898 return (selbs != NULL); 1899 if (selbs == NULL) 1900 goto notfound; 1901 chan = selbs->base.se_chan; 1902 if (selbs->se_flags & STA_DEMOTE11B) 1903 chan = demote11b(vap, chan); 1904 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1905 goto notfound; 1906 return 1; /* terminate scan */ 1907} 1908 1909static const struct ieee80211_scanner mesh_default = { 1910 .scan_name = "default", 1911 .scan_attach = sta_attach, 1912 .scan_detach = sta_detach, 1913 .scan_start = adhoc_start, 1914 .scan_restart = sta_restart, 1915 .scan_cancel = sta_cancel, 1916 .scan_end = mesh_pick_bss, 1917 .scan_flush = sta_flush, 1918 .scan_pickchan = adhoc_pick_channel, 1919 .scan_add = sta_add, 1920 .scan_age = adhoc_age, 1921 .scan_iterate = sta_iterate, 1922 .scan_assoc_fail = sta_assoc_fail, 1923 .scan_assoc_success = sta_assoc_success, 1924}; 1925IEEE80211_SCANNER_ALG(mesh, IEEE80211_M_MBSS, mesh_default); 1926#endif /* IEEE80211_SUPPORT_MESH */ 1927