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("$FreeBSD$"); 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/endian.h> 38 #include <sys/malloc.h> 39 #include <sys/module.h> 40 41 #include <sys/socket.h> 42 43 #include <net/if.h> 44 #include <net/if_var.h> 45 #include <net/if_media.h> 46 #include <net/ethernet.h> 47 48 #include <net80211/ieee80211_var.h> 49 #include <net80211/ieee80211_input.h> 50 #include <net80211/ieee80211_regdomain.h> 51 #ifdef IEEE80211_SUPPORT_TDMA 52 #include <net80211/ieee80211_tdma.h> 53 #endif 54 #ifdef IEEE80211_SUPPORT_MESH 55 #include <net80211/ieee80211_mesh.h> 56 #endif 57 #include <net80211/ieee80211_ratectl.h> 58 #include <net80211/ieee80211_vht.h> 59 60 #include <net/bpf.h> 61 62 /* 63 * Parameters for managing cache entries: 64 * 65 * o a station with STA_FAILS_MAX failures is not considered 66 * when picking a candidate 67 * o a station that hasn't had an update in STA_PURGE_SCANS 68 * (background) scans is discarded 69 * o after STA_FAILS_AGE seconds we clear the failure count 70 */ 71 #define STA_FAILS_MAX 2 /* assoc failures before ignored */ 72 #define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */ 73 #define STA_PURGE_SCANS 2 /* age for purging entries (scans) */ 74 75 /* XXX tunable */ 76 #define STA_RSSI_MIN 8 /* min acceptable rssi */ 77 #define STA_RSSI_MAX 40 /* max rssi for comparison */ 78 79 struct sta_entry { 80 struct ieee80211_scan_entry base; 81 TAILQ_ENTRY(sta_entry) se_list; 82 LIST_ENTRY(sta_entry) se_hash; 83 uint8_t se_fails; /* failure to associate count */ 84 uint8_t se_seen; /* seen during current scan */ 85 uint8_t se_notseen; /* not seen in previous scans */ 86 uint8_t se_flags; 87 #define STA_DEMOTE11B 0x01 /* match w/ demoted 11b chan */ 88 uint32_t se_avgrssi; /* LPF rssi state */ 89 unsigned long se_lastupdate; /* time of last update */ 90 unsigned long se_lastfail; /* time of last failure */ 91 unsigned long se_lastassoc; /* time of last association */ 92 u_int se_scangen; /* iterator scan gen# */ 93 u_int se_countrygen; /* gen# of last cc notify */ 94 }; 95 96 #define STA_HASHSIZE 32 97 /* simple hash is enough for variation of macaddr */ 98 #define STA_HASH(addr) \ 99 (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE) 100 101 #define MAX_IEEE_CHAN 256 /* max acceptable IEEE chan # */ 102 CTASSERT(MAX_IEEE_CHAN >= 256); 103 104 struct sta_table { 105 ieee80211_scan_table_lock_t st_lock; /* on scan table */ 106 TAILQ_HEAD(, sta_entry) st_entry; /* all entries */ 107 LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE]; 108 ieee80211_scan_iter_lock_t st_scanlock; /* on st_scaniter */ 109 u_int st_scaniter; /* gen# for iterator */ 110 u_int st_scangen; /* scan generation # */ 111 int st_newscan; 112 /* ap-related state */ 113 int st_maxrssi[MAX_IEEE_CHAN]; 114 }; 115 116 static void sta_flush_table(struct sta_table *); 117 /* 118 * match_bss returns a bitmask describing if an entry is suitable 119 * for use. If non-zero the entry was deemed not suitable and it's 120 * contents explains why. The following flags are or'd to to this 121 * mask and can be used to figure out why the entry was rejected. 122 */ 123 #define MATCH_CHANNEL 0x00001 /* channel mismatch */ 124 #define MATCH_CAPINFO 0x00002 /* capabilities mismatch, e.g. no ess */ 125 #define MATCH_PRIVACY 0x00004 /* privacy mismatch */ 126 #define MATCH_RATE 0x00008 /* rate set mismatch */ 127 #define MATCH_SSID 0x00010 /* ssid mismatch */ 128 #define MATCH_BSSID 0x00020 /* bssid mismatch */ 129 #define MATCH_FAILS 0x00040 /* too many failed auth attempts */ 130 #define MATCH_NOTSEEN 0x00080 /* not seen in recent scans */ 131 #define MATCH_RSSI 0x00100 /* rssi deemed too low to use */ 132 #define MATCH_CC 0x00200 /* country code mismatch */ 133 #ifdef IEEE80211_SUPPORT_TDMA 134 #define MATCH_TDMA_NOIE 0x00400 /* no TDMA ie */ 135 #define MATCH_TDMA_NOTMASTER 0x00800 /* not TDMA master */ 136 #define MATCH_TDMA_NOSLOT 0x01000 /* all TDMA slots occupied */ 137 #define MATCH_TDMA_LOCAL 0x02000 /* local address */ 138 #define MATCH_TDMA_VERSION 0x04000 /* protocol version mismatch */ 139 #endif 140 #define MATCH_MESH_NOID 0x10000 /* no MESHID ie */ 141 #define MATCH_MESHID 0x20000 /* meshid mismatch */ 142 static int match_bss(struct ieee80211vap *, 143 const struct ieee80211_scan_state *, struct sta_entry *, int); 144 static void adhoc_age(struct ieee80211_scan_state *); 145 146 static __inline int 147 isocmp(const uint8_t cc1[], const uint8_t cc2[]) 148 { 149 return (cc1[0] == cc2[0] && cc1[1] == cc2[1]); 150 } 151 152 /* number of references from net80211 layer */ 153 static int nrefs = 0; 154 /* 155 * Module glue. 156 */ 157 IEEE80211_SCANNER_MODULE(sta, 1); 158 159 /* 160 * Attach prior to any scanning work. 161 */ 162 static int 163 sta_attach(struct ieee80211_scan_state *ss) 164 { 165 struct sta_table *st; 166 167 st = (struct sta_table *) IEEE80211_MALLOC(sizeof(struct sta_table), 168 M_80211_SCAN, 169 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 170 if (st == NULL) 171 return 0; 172 IEEE80211_SCAN_TABLE_LOCK_INIT(st, "scantable"); 173 IEEE80211_SCAN_ITER_LOCK_INIT(st, "scangen"); 174 TAILQ_INIT(&st->st_entry); 175 ss->ss_priv = st; 176 nrefs++; /* NB: we assume caller locking */ 177 return 1; 178 } 179 180 /* 181 * Cleanup any private state. 182 */ 183 static int 184 sta_detach(struct ieee80211_scan_state *ss) 185 { 186 struct sta_table *st = ss->ss_priv; 187 188 if (st != NULL) { 189 sta_flush_table(st); 190 IEEE80211_SCAN_TABLE_LOCK_DESTROY(st); 191 IEEE80211_SCAN_ITER_LOCK_DESTROY(st); 192 IEEE80211_FREE(st, M_80211_SCAN); 193 KASSERT(nrefs > 0, ("imbalanced attach/detach")); 194 nrefs--; /* NB: we assume caller locking */ 195 } 196 return 1; 197 } 198 199 /* 200 * Flush all per-scan state. 201 */ 202 static int 203 sta_flush(struct ieee80211_scan_state *ss) 204 { 205 struct sta_table *st = ss->ss_priv; 206 207 IEEE80211_SCAN_TABLE_LOCK(st); 208 sta_flush_table(st); 209 IEEE80211_SCAN_TABLE_UNLOCK(st); 210 ss->ss_last = 0; 211 return 0; 212 } 213 214 /* 215 * Flush all entries in the scan cache. 216 */ 217 static void 218 sta_flush_table(struct sta_table *st) 219 { 220 struct sta_entry *se, *next; 221 222 TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 223 TAILQ_REMOVE(&st->st_entry, se, se_list); 224 LIST_REMOVE(se, se_hash); 225 ieee80211_ies_cleanup(&se->base.se_ies); 226 IEEE80211_FREE(se, M_80211_SCAN); 227 } 228 memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi)); 229 } 230 231 /* 232 * Process a beacon or probe response frame; create an 233 * entry in the scan cache or update any previous entry. 234 */ 235 static int 236 sta_add(struct ieee80211_scan_state *ss, 237 struct ieee80211_channel *curchan, 238 const struct ieee80211_scanparams *sp, 239 const struct ieee80211_frame *wh, 240 int subtype, int rssi, int noise) 241 { 242 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 243 #define PICK1ST(_ss) \ 244 ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \ 245 IEEE80211_SCAN_PICK1ST) 246 struct sta_table *st = ss->ss_priv; 247 const uint8_t *macaddr = wh->i_addr2; 248 struct ieee80211vap *vap = ss->ss_vap; 249 struct ieee80211com *ic = vap->iv_ic; 250 struct ieee80211_channel *c; 251 struct sta_entry *se; 252 struct ieee80211_scan_entry *ise; 253 int hash; 254 255 hash = STA_HASH(macaddr); 256 257 IEEE80211_SCAN_TABLE_LOCK(st); 258 LIST_FOREACH(se, &st->st_hash[hash], se_hash) 259 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 260 goto found; 261 se = (struct sta_entry *) IEEE80211_MALLOC(sizeof(struct sta_entry), 262 M_80211_SCAN, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 263 if (se == NULL) { 264 IEEE80211_SCAN_TABLE_UNLOCK(st); 265 return 0; 266 } 267 se->se_scangen = st->st_scaniter-1; 268 se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER; 269 IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr); 270 TAILQ_INSERT_TAIL(&st->st_entry, se, se_list); 271 LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash); 272 found: 273 ise = &se->base; 274 /* XXX ap beaconing multiple ssid w/ same bssid */ 275 if (sp->ssid[1] != 0 && 276 (ISPROBE(subtype) || ise->se_ssid[1] == 0)) 277 memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]); 278 KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE, 279 ("rate set too large: %u", sp->rates[1])); 280 memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]); 281 if (sp->xrates != NULL) { 282 /* XXX validate xrates[1] */ 283 KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE, 284 ("xrate set too large: %u", sp->xrates[1])); 285 memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]); 286 } else 287 ise->se_xrates[1] = 0; 288 IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3); 289 if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) { 290 /* 291 * Record rssi data using extended precision LPF filter. 292 * 293 * NB: use only on-channel data to insure we get a good 294 * estimate of the signal we'll see when associated. 295 */ 296 IEEE80211_RSSI_LPF(se->se_avgrssi, rssi); 297 ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi); 298 ise->se_noise = noise; 299 } 300 memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp)); 301 ise->se_intval = sp->bintval; 302 ise->se_capinfo = sp->capinfo; 303 #ifdef IEEE80211_SUPPORT_MESH 304 if (sp->meshid != NULL && sp->meshid[1] != 0) 305 memcpy(ise->se_meshid, sp->meshid, 2+sp->meshid[1]); 306 #endif 307 /* 308 * Beware of overriding se_chan for frames seen 309 * off-channel; this can cause us to attempt an 310 * association on the wrong channel. 311 */ 312 if (sp->status & IEEE80211_BPARSE_OFFCHAN) { 313 /* 314 * Off-channel, locate the home/bss channel for the sta 315 * using the value broadcast in the DSPARMS ie. We know 316 * sp->chan has this value because it's used to calculate 317 * IEEE80211_BPARSE_OFFCHAN. 318 */ 319 c = ieee80211_find_channel_byieee(ic, sp->chan, 320 curchan->ic_flags); 321 if (c != NULL) { 322 ise->se_chan = c; 323 } else if (ise->se_chan == NULL) { 324 /* should not happen, pick something */ 325 ise->se_chan = curchan; 326 } 327 } else 328 ise->se_chan = curchan; 329 330 /* VHT demotion */ 331 if (IEEE80211_IS_CHAN_VHT(ise->se_chan) && sp->vhtcap == NULL) { 332 IEEE80211_DPRINTF(vap, IEEE80211_MSG_11N, 333 "%s: demoting VHT->HT %d/0x%08x\n", 334 __func__, ise->se_chan->ic_freq, ise->se_chan->ic_flags); 335 /* Demote legacy networks to a non-VHT channel. */ 336 c = ieee80211_find_channel(ic, ise->se_chan->ic_freq, 337 ise->se_chan->ic_flags & ~IEEE80211_CHAN_VHT); 338 KASSERT(c != NULL, 339 ("no non-VHT channel %u", ise->se_chan->ic_ieee)); 340 ise->se_chan = c; 341 } 342 343 /* HT demotion */ 344 if (IEEE80211_IS_CHAN_HT(ise->se_chan) && sp->htcap == NULL) { 345 /* Demote legacy networks to a non-HT channel. */ 346 IEEE80211_DPRINTF(vap, IEEE80211_MSG_11N, 347 "%s: demoting HT->legacy %d/0x%08x\n", 348 __func__, ise->se_chan->ic_freq, ise->se_chan->ic_flags); 349 c = ieee80211_find_channel(ic, ise->se_chan->ic_freq, 350 ise->se_chan->ic_flags & ~IEEE80211_CHAN_HT); 351 KASSERT(c != NULL, 352 ("no legacy channel %u", ise->se_chan->ic_ieee)); 353 ise->se_chan = c; 354 } 355 356 ise->se_fhdwell = sp->fhdwell; 357 ise->se_fhindex = sp->fhindex; 358 ise->se_erp = sp->erp; 359 ise->se_timoff = sp->timoff; 360 if (sp->tim != NULL) { 361 const struct ieee80211_tim_ie *tim = 362 (const struct ieee80211_tim_ie *) sp->tim; 363 ise->se_dtimperiod = tim->tim_period; 364 } 365 if (sp->country != NULL) { 366 const struct ieee80211_country_ie *cie = 367 (const struct ieee80211_country_ie *) sp->country; 368 /* 369 * If 11d is enabled and we're attempting to join a bss 370 * that advertises it's country code then compare our 371 * current settings to what we fetched from the country ie. 372 * If our country code is unspecified or different then 373 * dispatch an event to user space that identifies the 374 * country code so our regdomain config can be changed. 375 */ 376 /* XXX only for STA mode? */ 377 if ((IEEE80211_IS_CHAN_11D(ise->se_chan) || 378 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 379 (ic->ic_regdomain.country == CTRY_DEFAULT || 380 !isocmp(cie->cc, ic->ic_regdomain.isocc))) { 381 /* only issue one notify event per scan */ 382 if (se->se_countrygen != st->st_scangen) { 383 ieee80211_notify_country(vap, ise->se_bssid, 384 cie->cc); 385 se->se_countrygen = st->st_scangen; 386 } 387 } 388 ise->se_cc[0] = cie->cc[0]; 389 ise->se_cc[1] = cie->cc[1]; 390 } 391 /* NB: no need to setup ie ptrs; they are not (currently) used */ 392 (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len); 393 394 /* clear failure count after STA_FAIL_AGE passes */ 395 if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) { 396 se->se_fails = 0; 397 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr, 398 "%s: fails %u", __func__, se->se_fails); 399 } 400 401 se->se_lastupdate = ticks; /* update time */ 402 se->se_seen = 1; 403 se->se_notseen = 0; 404 405 KASSERT(sizeof(sp->bchan) == 1, ("bchan size")); 406 if (rssi > st->st_maxrssi[sp->bchan]) 407 st->st_maxrssi[sp->bchan] = rssi; 408 409 IEEE80211_SCAN_TABLE_UNLOCK(st); 410 411 /* 412 * If looking for a quick choice and nothing's 413 * been found check here. 414 */ 415 if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0) 416 ss->ss_flags |= IEEE80211_SCAN_GOTPICK; 417 418 return 1; 419 #undef PICK1ST 420 #undef ISPROBE 421 } 422 423 /* 424 * Check if a channel is excluded by user request. 425 */ 426 static int 427 isexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c) 428 { 429 return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) || 430 (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 431 c->ic_freq != vap->iv_des_chan->ic_freq)); 432 } 433 434 static struct ieee80211_channel * 435 find11gchannel(struct ieee80211com *ic, int i, int freq) 436 { 437 struct ieee80211_channel *c; 438 int j; 439 440 /* 441 * The normal ordering in the channel list is b channel 442 * immediately followed by g so optimize the search for 443 * this. We'll still do a full search just in case. 444 */ 445 for (j = i+1; j < ic->ic_nchans; j++) { 446 c = &ic->ic_channels[j]; 447 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 448 return c; 449 } 450 for (j = 0; j < i; j++) { 451 c = &ic->ic_channels[j]; 452 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 453 return c; 454 } 455 return NULL; 456 } 457 458 static const u_int chanflags[IEEE80211_MODE_MAX] = { 459 [IEEE80211_MODE_AUTO] = IEEE80211_CHAN_B, 460 [IEEE80211_MODE_11A] = IEEE80211_CHAN_A, 461 [IEEE80211_MODE_11B] = IEEE80211_CHAN_B, 462 [IEEE80211_MODE_11G] = IEEE80211_CHAN_G, 463 [IEEE80211_MODE_FH] = IEEE80211_CHAN_FHSS, 464 /* check base channel */ 465 [IEEE80211_MODE_TURBO_A] = IEEE80211_CHAN_A, 466 [IEEE80211_MODE_TURBO_G] = IEEE80211_CHAN_G, 467 [IEEE80211_MODE_STURBO_A] = IEEE80211_CHAN_ST, 468 [IEEE80211_MODE_HALF] = IEEE80211_CHAN_HALF, 469 [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_QUARTER, 470 /* check legacy */ 471 [IEEE80211_MODE_11NA] = IEEE80211_CHAN_A, 472 [IEEE80211_MODE_11NG] = IEEE80211_CHAN_G, 473 }; 474 475 static void 476 add_channels(struct ieee80211vap *vap, 477 struct ieee80211_scan_state *ss, 478 enum ieee80211_phymode mode, const uint16_t freq[], int nfreq) 479 { 480 struct ieee80211com *ic = vap->iv_ic; 481 struct ieee80211_channel *c, *cg; 482 u_int modeflags; 483 int i; 484 485 KASSERT(mode < nitems(chanflags), ("Unexpected mode %u", mode)); 486 modeflags = chanflags[mode]; 487 for (i = 0; i < nfreq; i++) { 488 if (ss->ss_last >= IEEE80211_SCAN_MAX) 489 break; 490 491 c = ieee80211_find_channel(ic, freq[i], modeflags); 492 if (c == NULL || isexcluded(vap, c)) 493 continue; 494 if (mode == IEEE80211_MODE_AUTO) { 495 /* 496 * XXX special-case 11b/g channels so we select 497 * the g channel if both are present. 498 */ 499 if (IEEE80211_IS_CHAN_B(c) && 500 (cg = find11gchannel(ic, i, c->ic_freq)) != NULL) 501 c = cg; 502 } 503 ss->ss_chans[ss->ss_last++] = c; 504 } 505 } 506 507 struct scanlist { 508 uint16_t mode; 509 uint16_t count; 510 const uint16_t *list; 511 }; 512 513 static int 514 checktable(const struct scanlist *scan, const struct ieee80211_channel *c) 515 { 516 int i; 517 518 for (; scan->list != NULL; scan++) { 519 for (i = 0; i < scan->count; i++) 520 if (scan->list[i] == c->ic_freq) 521 return 1; 522 } 523 return 0; 524 } 525 526 static int 527 onscanlist(const struct ieee80211_scan_state *ss, 528 const struct ieee80211_channel *c) 529 { 530 int i; 531 532 for (i = 0; i < ss->ss_last; i++) 533 if (ss->ss_chans[i] == c) 534 return 1; 535 return 0; 536 } 537 538 static void 539 sweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 540 const struct scanlist table[]) 541 { 542 struct ieee80211com *ic = vap->iv_ic; 543 struct ieee80211_channel *c; 544 int i; 545 546 for (i = 0; i < ic->ic_nchans; i++) { 547 if (ss->ss_last >= IEEE80211_SCAN_MAX) 548 break; 549 550 c = &ic->ic_channels[i]; 551 /* 552 * Ignore dynamic turbo channels; we scan them 553 * in normal mode (i.e. not boosted). Likewise 554 * for HT/VHT channels, they get scanned using 555 * legacy rates. 556 */ 557 if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c) || 558 IEEE80211_IS_CHAN_VHT(c)) 559 continue; 560 561 /* 562 * If a desired mode was specified, scan only 563 * channels that satisfy that constraint. 564 */ 565 if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 566 vap->iv_des_mode != ieee80211_chan2mode(c)) 567 continue; 568 569 /* 570 * Skip channels excluded by user request. 571 */ 572 if (isexcluded(vap, c)) 573 continue; 574 575 /* 576 * Add the channel unless it is listed in the 577 * fixed scan order tables. This insures we 578 * don't sweep back in channels we filtered out 579 * above. 580 */ 581 if (checktable(table, c)) 582 continue; 583 584 /* Add channel to scanning list. */ 585 ss->ss_chans[ss->ss_last++] = c; 586 } 587 /* 588 * Explicitly add any desired channel if: 589 * - not already on the scan list 590 * - allowed by any desired mode constraint 591 * - there is space in the scan list 592 * This allows the channel to be used when the filtering 593 * mechanisms would otherwise elide it (e.g HT, turbo). 594 */ 595 c = vap->iv_des_chan; 596 if (c != IEEE80211_CHAN_ANYC && 597 !onscanlist(ss, c) && 598 (vap->iv_des_mode == IEEE80211_MODE_AUTO || 599 vap->iv_des_mode == ieee80211_chan2mode(c)) && 600 ss->ss_last < IEEE80211_SCAN_MAX) 601 ss->ss_chans[ss->ss_last++] = c; 602 } 603 604 static void 605 makescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 606 const struct scanlist table[]) 607 { 608 const struct scanlist *scan; 609 enum ieee80211_phymode mode; 610 611 ss->ss_last = 0; 612 /* 613 * Use the table of ordered channels to construct the list 614 * of channels for scanning. Any channels in the ordered 615 * list not in the master list will be discarded. 616 */ 617 for (scan = table; scan->list != NULL; scan++) { 618 mode = scan->mode; 619 if (vap->iv_des_mode != IEEE80211_MODE_AUTO) { 620 /* 621 * If a desired mode was specified, scan only 622 * channels that satisfy that constraint. 623 */ 624 if (vap->iv_des_mode != mode) { 625 /* 626 * The scan table marks 2.4Ghz channels as b 627 * so if the desired mode is 11g, then use 628 * the 11b channel list but upgrade the mode. 629 */ 630 if (vap->iv_des_mode == IEEE80211_MODE_11G) { 631 if (mode == IEEE80211_MODE_11G) /* Skip the G check */ 632 continue; 633 else if (mode == IEEE80211_MODE_11B) 634 mode = IEEE80211_MODE_11G; /* upgrade */ 635 } 636 } 637 } else { 638 /* 639 * This lets add_channels upgrade an 11b channel 640 * to 11g if available. 641 */ 642 if (mode == IEEE80211_MODE_11B) 643 mode = IEEE80211_MODE_AUTO; 644 } 645 #ifdef IEEE80211_F_XR 646 /* XR does not operate on turbo channels */ 647 if ((vap->iv_flags & IEEE80211_F_XR) && 648 (mode == IEEE80211_MODE_TURBO_A || 649 mode == IEEE80211_MODE_TURBO_G || 650 mode == IEEE80211_MODE_STURBO_A)) 651 continue; 652 #endif 653 /* 654 * Add the list of the channels; any that are not 655 * in the master channel list will be discarded. 656 */ 657 add_channels(vap, ss, mode, scan->list, scan->count); 658 } 659 660 /* 661 * Add the channels from the ic that are not present 662 * in the table. 663 */ 664 sweepchannels(ss, vap, table); 665 } 666 667 static const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 668 { 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 669 static const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 670 { 5170, 5190, 5210, 5230 }; 671 static const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 672 { 2412, 2437, 2462, 2442, 2472 }; 673 static const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 674 { 5745, 5765, 5785, 5805, 5825 }; 675 static const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ 676 { 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; 677 static const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 678 { 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 679 static const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 680 { 2484 }; 681 static const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 682 { 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 683 static const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ 684 { 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; 685 #ifdef ATH_TURBO_SCAN 686 static const uint16_t rcl5[] = /* 3 static turbo channels */ 687 { 5210, 5250, 5290 }; 688 static const uint16_t rcl6[] = /* 2 static turbo channels */ 689 { 5760, 5800 }; 690 static const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 691 { 5540, 5580, 5620, 5660 }; 692 static const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 693 { 2437 }; 694 static const uint16_t rcl13[] = /* dynamic Turbo channels */ 695 { 5200, 5240, 5280, 5765, 5805 }; 696 #endif /* ATH_TURBO_SCAN */ 697 698 #define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a 699 700 static const struct scanlist staScanTable[] = { 701 { IEEE80211_MODE_11B, X(rcl3) }, 702 { IEEE80211_MODE_11A, X(rcl1) }, 703 { IEEE80211_MODE_11A, X(rcl2) }, 704 { IEEE80211_MODE_11B, X(rcl8) }, 705 { IEEE80211_MODE_11B, X(rcl9) }, 706 { IEEE80211_MODE_11A, X(rcl4) }, 707 #ifdef ATH_TURBO_SCAN 708 { IEEE80211_MODE_STURBO_A, X(rcl5) }, 709 { IEEE80211_MODE_STURBO_A, X(rcl6) }, 710 { IEEE80211_MODE_TURBO_A, X(rcl6x) }, 711 { IEEE80211_MODE_TURBO_A, X(rcl13) }, 712 #endif /* ATH_TURBO_SCAN */ 713 { IEEE80211_MODE_11A, X(rcl7) }, 714 { IEEE80211_MODE_11B, X(rcl10) }, 715 { IEEE80211_MODE_11A, X(rcl11) }, 716 #ifdef ATH_TURBO_SCAN 717 { IEEE80211_MODE_TURBO_G, X(rcl12) }, 718 #endif /* ATH_TURBO_SCAN */ 719 { .list = NULL } 720 }; 721 722 /* 723 * Start a station-mode scan by populating the channel list. 724 */ 725 static int 726 sta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 727 { 728 struct sta_table *st = ss->ss_priv; 729 730 makescanlist(ss, vap, staScanTable); 731 732 if (ss->ss_mindwell == 0) 733 ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ 734 if (ss->ss_maxdwell == 0) 735 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 736 737 st->st_scangen++; 738 st->st_newscan = 1; 739 740 return 0; 741 } 742 743 /* 744 * Restart a scan, typically a bg scan but can 745 * also be a fg scan that came up empty. 746 */ 747 static int 748 sta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 749 { 750 struct sta_table *st = ss->ss_priv; 751 752 st->st_newscan = 1; 753 return 0; 754 } 755 756 /* 757 * Cancel an ongoing scan. 758 */ 759 static int 760 sta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 761 { 762 return 0; 763 } 764 765 /* 766 * Demote any supplied 11g channel to 11b. There should 767 * always be an 11b channel but we check anyway... 768 */ 769 static struct ieee80211_channel * 770 demote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan) 771 { 772 struct ieee80211_channel *c; 773 774 if (IEEE80211_IS_CHAN_ANYG(chan) && 775 vap->iv_des_mode == IEEE80211_MODE_AUTO) { 776 c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq, 777 (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) | 778 IEEE80211_CHAN_B); 779 if (c != NULL) 780 chan = c; 781 } 782 return chan; 783 } 784 785 static int 786 maxrate(const struct ieee80211_scan_entry *se) 787 { 788 const struct ieee80211_ie_htcap *htcap = 789 (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie; 790 int rmax, r, i, txstream; 791 uint16_t caps; 792 uint8_t txparams; 793 794 rmax = 0; 795 if (htcap != NULL) { 796 /* 797 * HT station; inspect supported MCS and then adjust 798 * rate by channel width. 799 */ 800 txparams = htcap->hc_mcsset[12]; 801 if (txparams & 0x3) { 802 /* 803 * TX MCS parameters defined and not equal to RX, 804 * extract the number of spartial streams and 805 * map it to the highest MCS rate. 806 */ 807 txstream = ((txparams & 0xc) >> 2) + 1; 808 i = txstream * 8 - 1; 809 } else 810 for (i = 31; i >= 0 && isclr(htcap->hc_mcsset, i); i--); 811 if (i >= 0) { 812 caps = le16dec(&htcap->hc_cap); 813 if ((caps & IEEE80211_HTCAP_CHWIDTH40) && 814 (caps & IEEE80211_HTCAP_SHORTGI40)) 815 rmax = ieee80211_htrates[i].ht40_rate_400ns; 816 else if (caps & IEEE80211_HTCAP_CHWIDTH40) 817 rmax = ieee80211_htrates[i].ht40_rate_800ns; 818 else if (caps & IEEE80211_HTCAP_SHORTGI20) 819 rmax = ieee80211_htrates[i].ht20_rate_400ns; 820 else 821 rmax = ieee80211_htrates[i].ht20_rate_800ns; 822 } 823 } 824 for (i = 0; i < se->se_rates[1]; i++) { 825 r = se->se_rates[2+i] & IEEE80211_RATE_VAL; 826 if (r > rmax) 827 rmax = r; 828 } 829 for (i = 0; i < se->se_xrates[1]; i++) { 830 r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; 831 if (r > rmax) 832 rmax = r; 833 } 834 return rmax; 835 } 836 837 /* 838 * Compare the capabilities of two entries and decide which is 839 * more desirable (return >0 if a is considered better). Note 840 * that we assume compatibility/usability has already been checked 841 * so we don't need to (e.g. validate whether privacy is supported). 842 * Used to select the best scan candidate for association in a BSS. 843 * 844 * TODO: should we take 11n, 11ac into account when selecting the 845 * best? Right now it just compares frequency band and RSSI. 846 */ 847 static int 848 sta_compare(const struct sta_entry *a, const struct sta_entry *b) 849 { 850 #define PREFER(_a,_b,_what) do { \ 851 if (((_a) ^ (_b)) & (_what)) \ 852 return ((_a) & (_what)) ? 1 : -1; \ 853 } while (0) 854 int maxa, maxb; 855 int8_t rssia, rssib; 856 int weight; 857 858 /* privacy support */ 859 PREFER(a->base.se_capinfo, b->base.se_capinfo, 860 IEEE80211_CAPINFO_PRIVACY); 861 862 /* compare count of previous failures */ 863 weight = b->se_fails - a->se_fails; 864 if (abs(weight) > 1) 865 return weight; 866 867 /* 868 * Compare rssi. If the two are considered equivalent 869 * then fallback to other criteria. We threshold the 870 * comparisons to avoid selecting an ap purely by rssi 871 * when both values may be good but one ap is otherwise 872 * more desirable (e.g. an 11b-only ap with stronger 873 * signal than an 11g ap). 874 */ 875 rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 876 rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 877 if (abs(rssib - rssia) < 5) { 878 /* best/max rate preferred if signal level close enough XXX */ 879 maxa = maxrate(&a->base); 880 maxb = maxrate(&b->base); 881 if (maxa != maxb) 882 return maxa - maxb; 883 /* XXX use freq for channel preference */ 884 /* for now just prefer 5Ghz band to all other bands */ 885 PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 886 IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 887 } 888 /* all things being equal, use signal level */ 889 return a->base.se_rssi - b->base.se_rssi; 890 #undef PREFER 891 } 892 893 /* 894 * Check rate set suitability and return the best supported rate. 895 * XXX inspect MCS for HT 896 */ 897 static int 898 check_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, 899 const struct ieee80211_scan_entry *se) 900 { 901 const struct ieee80211_rateset *srs; 902 int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 903 const uint8_t *rs; 904 905 okrate = badrate = 0; 906 907 srs = ieee80211_get_suprates(vap->iv_ic, chan); 908 nrs = se->se_rates[1]; 909 rs = se->se_rates+2; 910 /* XXX MCS */ 911 ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; 912 fixedrate = IEEE80211_FIXED_RATE_NONE; 913 again: 914 for (i = 0; i < nrs; i++) { 915 r = IEEE80211_RV(rs[i]); 916 badrate = r; 917 /* 918 * Check any fixed rate is included. 919 */ 920 if (r == ucastrate) 921 fixedrate = r; 922 /* 923 * Check against our supported rates. 924 */ 925 for (j = 0; j < srs->rs_nrates; j++) 926 if (r == IEEE80211_RV(srs->rs_rates[j])) { 927 if (r > okrate) /* NB: track max */ 928 okrate = r; 929 break; 930 } 931 932 if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 933 /* 934 * Don't try joining a BSS, if we don't support 935 * one of its basic rates. 936 */ 937 okrate = 0; 938 goto back; 939 } 940 } 941 if (rs == se->se_rates+2) { 942 /* scan xrates too; sort of an algol68-style for loop */ 943 nrs = se->se_xrates[1]; 944 rs = se->se_xrates+2; 945 goto again; 946 } 947 948 back: 949 if (okrate == 0 || ucastrate != fixedrate) 950 return badrate | IEEE80211_RATE_BASIC; 951 else 952 return IEEE80211_RV(okrate); 953 } 954 955 static __inline int 956 match_id(const uint8_t *ie, const uint8_t *val, int len) 957 { 958 return (ie[1] == len && memcmp(ie+2, val, len) == 0); 959 } 960 961 static int 962 match_ssid(const uint8_t *ie, 963 int nssid, const struct ieee80211_scan_ssid ssids[]) 964 { 965 int i; 966 967 for (i = 0; i < nssid; i++) { 968 if (match_id(ie, ssids[i].ssid, ssids[i].len)) 969 return 1; 970 } 971 return 0; 972 } 973 974 #ifdef IEEE80211_SUPPORT_TDMA 975 static int 976 tdma_isfull(const struct ieee80211_tdma_param *tdma) 977 { 978 int slot, slotcnt; 979 980 slotcnt = tdma->tdma_slotcnt; 981 for (slot = slotcnt-1; slot >= 0; slot--) 982 if (isclr(tdma->tdma_inuse, slot)) 983 return 0; 984 return 1; 985 } 986 #endif /* IEEE80211_SUPPORT_TDMA */ 987 988 /* 989 * Test a scan candidate for suitability/compatibility. 990 */ 991 static int 992 match_bss(struct ieee80211vap *vap, 993 const struct ieee80211_scan_state *ss, struct sta_entry *se0, 994 int debug) 995 { 996 struct ieee80211com *ic = vap->iv_ic; 997 struct ieee80211_scan_entry *se = &se0->base; 998 uint8_t rate; 999 int fail; 1000 1001 fail = 0; 1002 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 1003 fail |= MATCH_CHANNEL; 1004 /* 1005 * NB: normally the desired mode is used to construct 1006 * the channel list, but it's possible for the scan 1007 * cache to include entries for stations outside this 1008 * list so we check the desired mode here to weed them 1009 * out. 1010 */ 1011 if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 1012 (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 1013 chanflags[vap->iv_des_mode]) 1014 fail |= MATCH_CHANNEL; 1015 if (vap->iv_opmode == IEEE80211_M_IBSS) { 1016 if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 1017 fail |= MATCH_CAPINFO; 1018 #ifdef IEEE80211_SUPPORT_TDMA 1019 } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) { 1020 /* 1021 * Adhoc demo network setup shouldn't really be scanning 1022 * but just in case skip stations operating in IBSS or 1023 * BSS mode. 1024 */ 1025 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1026 fail |= MATCH_CAPINFO; 1027 /* 1028 * TDMA operation cannot coexist with a normal 802.11 network; 1029 * skip if IBSS or ESS capabilities are marked and require 1030 * the beacon have a TDMA ie present. 1031 */ 1032 if (vap->iv_caps & IEEE80211_C_TDMA) { 1033 const struct ieee80211_tdma_param *tdma = 1034 (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie; 1035 const struct ieee80211_tdma_state *ts = vap->iv_tdma; 1036 1037 if (tdma == NULL) 1038 fail |= MATCH_TDMA_NOIE; 1039 else if (tdma->tdma_version != ts->tdma_version) 1040 fail |= MATCH_TDMA_VERSION; 1041 else if (tdma->tdma_slot != 0) 1042 fail |= MATCH_TDMA_NOTMASTER; 1043 else if (tdma_isfull(tdma)) 1044 fail |= MATCH_TDMA_NOSLOT; 1045 #if 0 1046 else if (ieee80211_local_address(se->se_macaddr)) 1047 fail |= MATCH_TDMA_LOCAL; 1048 #endif 1049 } 1050 #endif /* IEEE80211_SUPPORT_TDMA */ 1051 #ifdef IEEE80211_SUPPORT_MESH 1052 } else if (vap->iv_opmode == IEEE80211_M_MBSS) { 1053 const struct ieee80211_mesh_state *ms = vap->iv_mesh; 1054 /* 1055 * Mesh nodes have IBSS & ESS bits in capinfo turned off 1056 * and two special ie's that must be present. 1057 */ 1058 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1059 fail |= MATCH_CAPINFO; 1060 else if (se->se_meshid[0] != IEEE80211_ELEMID_MESHID) 1061 fail |= MATCH_MESH_NOID; 1062 else if (ms->ms_idlen != 0 && 1063 match_id(se->se_meshid, ms->ms_id, ms->ms_idlen)) 1064 fail |= MATCH_MESHID; 1065 #endif 1066 } else { 1067 if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 1068 fail |= MATCH_CAPINFO; 1069 /* 1070 * If 11d is enabled and we're attempting to join a bss 1071 * that advertises it's country code then compare our 1072 * current settings to what we fetched from the country ie. 1073 * If our country code is unspecified or different then do 1074 * not attempt to join the bss. We should have already 1075 * dispatched an event to user space that identifies the 1076 * new country code so our regdomain config should match. 1077 */ 1078 if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 1079 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 1080 se->se_cc[0] != 0 && 1081 (ic->ic_regdomain.country == CTRY_DEFAULT || 1082 !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 1083 fail |= MATCH_CC; 1084 } 1085 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1086 if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 1087 fail |= MATCH_PRIVACY; 1088 } else { 1089 /* XXX does this mean privacy is supported or required? */ 1090 if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 1091 fail |= MATCH_PRIVACY; 1092 } 1093 se0->se_flags &= ~STA_DEMOTE11B; 1094 rate = check_rate(vap, se->se_chan, se); 1095 if (rate & IEEE80211_RATE_BASIC) { 1096 fail |= MATCH_RATE; 1097 /* 1098 * An 11b-only ap will give a rate mismatch if there is an 1099 * OFDM fixed tx rate for 11g. Try downgrading the channel 1100 * in the scan list to 11b and retry the rate check. 1101 */ 1102 if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { 1103 rate = check_rate(vap, demote11b(vap, se->se_chan), se); 1104 if ((rate & IEEE80211_RATE_BASIC) == 0) { 1105 fail &= ~MATCH_RATE; 1106 se0->se_flags |= STA_DEMOTE11B; 1107 } 1108 } 1109 } else if (rate < 2*24) { 1110 /* 1111 * This is an 11b-only ap. Check the desired mode in 1112 * case that needs to be honored (mode 11g filters out 1113 * 11b-only ap's). Otherwise force any 11g channel used 1114 * in scanning to be demoted. 1115 * 1116 * NB: we cheat a bit here by looking at the max rate; 1117 * we could/should check the rates. 1118 */ 1119 if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || 1120 vap->iv_des_mode == IEEE80211_MODE_11B)) 1121 fail |= MATCH_RATE; 1122 else 1123 se0->se_flags |= STA_DEMOTE11B; 1124 } 1125 if (ss->ss_nssid != 0 && 1126 !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 1127 fail |= MATCH_SSID; 1128 if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 1129 !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 1130 fail |= MATCH_BSSID; 1131 if (se0->se_fails >= STA_FAILS_MAX) 1132 fail |= MATCH_FAILS; 1133 if (se0->se_notseen >= STA_PURGE_SCANS) 1134 fail |= MATCH_NOTSEEN; 1135 if (se->se_rssi < STA_RSSI_MIN) 1136 fail |= MATCH_RSSI; 1137 #ifdef IEEE80211_DEBUG 1138 if (ieee80211_msg(vap, debug)) { 1139 printf(" %c %s", 1140 fail & MATCH_FAILS ? '=' : 1141 fail & MATCH_NOTSEEN ? '^' : 1142 fail & MATCH_CC ? '$' : 1143 #ifdef IEEE80211_SUPPORT_TDMA 1144 fail & MATCH_TDMA_NOIE ? '&' : 1145 fail & MATCH_TDMA_VERSION ? 'v' : 1146 fail & MATCH_TDMA_NOTMASTER ? 's' : 1147 fail & MATCH_TDMA_NOSLOT ? 'f' : 1148 fail & MATCH_TDMA_LOCAL ? 'l' : 1149 #endif 1150 fail & MATCH_MESH_NOID ? 'm' : 1151 fail ? '-' : '+', ether_sprintf(se->se_macaddr)); 1152 printf(" %s%c", ether_sprintf(se->se_bssid), 1153 fail & MATCH_BSSID ? '!' : ' '); 1154 printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 1155 fail & MATCH_CHANNEL ? '!' : ' '); 1156 printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 1157 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1158 fail & MATCH_RATE ? '!' : ' '); 1159 printf(" %4s%c", 1160 (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1161 (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "", 1162 fail & MATCH_CAPINFO ? '!' : ' '); 1163 printf(" %3s%c ", 1164 (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1165 "wep" : "no", 1166 fail & MATCH_PRIVACY ? '!' : ' '); 1167 ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 1168 printf("%s\n", fail & (MATCH_SSID | MATCH_MESHID) ? "!" : ""); 1169 } 1170 #endif 1171 return fail; 1172 } 1173 1174 static void 1175 sta_update_notseen(struct sta_table *st) 1176 { 1177 struct sta_entry *se; 1178 1179 IEEE80211_SCAN_TABLE_LOCK(st); 1180 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1181 /* 1182 * If seen the reset and don't bump the count; 1183 * otherwise bump the ``not seen'' count. Note 1184 * that this insures that stations for which we 1185 * see frames while not scanning but not during 1186 * this scan will not be penalized. 1187 */ 1188 if (se->se_seen) 1189 se->se_seen = 0; 1190 else 1191 se->se_notseen++; 1192 } 1193 IEEE80211_SCAN_TABLE_UNLOCK(st); 1194 } 1195 1196 static void 1197 sta_dec_fails(struct sta_table *st) 1198 { 1199 struct sta_entry *se; 1200 1201 IEEE80211_SCAN_TABLE_LOCK(st); 1202 TAILQ_FOREACH(se, &st->st_entry, se_list) 1203 if (se->se_fails) 1204 se->se_fails--; 1205 IEEE80211_SCAN_TABLE_UNLOCK(st); 1206 } 1207 1208 static struct sta_entry * 1209 select_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 1210 { 1211 struct sta_table *st = ss->ss_priv; 1212 struct sta_entry *se, *selbs = NULL; 1213 1214 IEEE80211_DPRINTF(vap, debug, " %s\n", 1215 "macaddr bssid chan rssi rate flag wep essid"); 1216 IEEE80211_SCAN_TABLE_LOCK(st); 1217 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1218 ieee80211_ies_expand(&se->base.se_ies); 1219 if (match_bss(vap, ss, se, debug) == 0) { 1220 if (selbs == NULL) 1221 selbs = se; 1222 else if (sta_compare(se, selbs) > 0) 1223 selbs = se; 1224 } 1225 } 1226 IEEE80211_SCAN_TABLE_UNLOCK(st); 1227 1228 return selbs; 1229 } 1230 1231 /* 1232 * Pick an ap or ibss network to join or find a channel 1233 * to use to start an ibss network. 1234 */ 1235 static int 1236 sta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1237 { 1238 struct sta_table *st = ss->ss_priv; 1239 struct sta_entry *selbs; 1240 struct ieee80211_channel *chan; 1241 1242 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1243 ("wrong mode %u", vap->iv_opmode)); 1244 1245 if (st->st_newscan) { 1246 sta_update_notseen(st); 1247 st->st_newscan = 0; 1248 } 1249 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1250 /* 1251 * Manual/background scan, don't select+join the 1252 * bss, just return. The scanning framework will 1253 * handle notification that this has completed. 1254 */ 1255 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1256 return 1; 1257 } 1258 /* 1259 * Automatic sequencing; look for a candidate and 1260 * if found join the network. 1261 */ 1262 /* NB: unlocked read should be ok */ 1263 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1264 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1265 "%s: no scan candidate\n", __func__); 1266 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1267 return 0; 1268 notfound: 1269 /* 1270 * If nothing suitable was found decrement 1271 * the failure counts so entries will be 1272 * reconsidered the next time around. We 1273 * really want to do this only for sta's 1274 * where we've previously had some success. 1275 */ 1276 sta_dec_fails(st); 1277 st->st_newscan = 1; 1278 return 0; /* restart scan */ 1279 } 1280 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1281 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1282 return (selbs != NULL); 1283 if (selbs == NULL) 1284 goto notfound; 1285 chan = selbs->base.se_chan; 1286 if (selbs->se_flags & STA_DEMOTE11B) 1287 chan = demote11b(vap, chan); 1288 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1289 goto notfound; 1290 return 1; /* terminate scan */ 1291 } 1292 1293 /* 1294 * Lookup an entry in the scan cache. We assume we're 1295 * called from the bottom half or such that we don't need 1296 * to block the bottom half so that it's safe to return 1297 * a reference to an entry w/o holding the lock on the table. 1298 */ 1299 static struct sta_entry * 1300 sta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1301 { 1302 struct sta_entry *se; 1303 int hash = STA_HASH(macaddr); 1304 1305 IEEE80211_SCAN_TABLE_LOCK(st); 1306 LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1307 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1308 break; 1309 IEEE80211_SCAN_TABLE_UNLOCK(st); 1310 1311 return se; /* NB: unlocked */ 1312 } 1313 1314 static void 1315 sta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1316 { 1317 struct ieee80211com *ic = vap->iv_ic; 1318 struct ieee80211_node *ni = vap->iv_bss; 1319 struct sta_table *st = ss->ss_priv; 1320 enum ieee80211_phymode mode; 1321 struct sta_entry *se, *selbs; 1322 uint8_t roamRate, curRate, ucastRate; 1323 int8_t roamRssi, curRssi; 1324 1325 se = sta_lookup(st, ni->ni_macaddr); 1326 if (se == NULL) { 1327 /* XXX something is wrong */ 1328 return; 1329 } 1330 1331 mode = ieee80211_chan2mode(ic->ic_bsschan); 1332 roamRate = vap->iv_roamparms[mode].rate; 1333 roamRssi = vap->iv_roamparms[mode].rssi; 1334 ucastRate = vap->iv_txparms[mode].ucastrate; 1335 /* NB: the most up to date rssi is in the node, not the scan cache */ 1336 curRssi = ic->ic_node_getrssi(ni); 1337 if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1338 curRate = ni->ni_txrate; 1339 roamRate &= IEEE80211_RATE_VAL; 1340 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1341 "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1342 __func__, curRssi, curRate, roamRssi, roamRate); 1343 } else { 1344 curRate = roamRate; /* NB: insure compare below fails */ 1345 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1346 "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1347 } 1348 /* 1349 * Check if a new ap should be used and switch. 1350 * XXX deauth current ap 1351 */ 1352 if (curRate < roamRate || curRssi < roamRssi) { 1353 if (ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1354 /* 1355 * Scan cache contents are too old; force a scan now 1356 * if possible so we have current state to make a 1357 * decision with. We don't kick off a bg scan if 1358 * we're using dynamic turbo and boosted or if the 1359 * channel is busy. 1360 * XXX force immediate switch on scan complete 1361 */ 1362 if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1363 ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) || 1364 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle))) 1365 ieee80211_bg_scan(vap, 0); 1366 return; 1367 } 1368 se->base.se_rssi = curRssi; 1369 selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1370 if (selbs != NULL && selbs != se) { 1371 struct ieee80211_channel *chan; 1372 1373 IEEE80211_DPRINTF(vap, 1374 IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1375 "%s: ROAM: curRate %u, roamRate %u, " 1376 "curRssi %d, roamRssi %d\n", __func__, 1377 curRate, roamRate, curRssi, roamRssi); 1378 1379 chan = selbs->base.se_chan; 1380 if (selbs->se_flags & STA_DEMOTE11B) 1381 chan = demote11b(vap, chan); 1382 (void) ieee80211_sta_join(vap, chan, &selbs->base); 1383 } 1384 } 1385 } 1386 1387 /* 1388 * Age entries in the scan cache. 1389 * XXX also do roaming since it's convenient 1390 */ 1391 static void 1392 sta_age(struct ieee80211_scan_state *ss) 1393 { 1394 struct ieee80211vap *vap = ss->ss_vap; 1395 1396 adhoc_age(ss); 1397 /* 1398 * If rate control is enabled check periodically to see if 1399 * we should roam from our current connection to one that 1400 * might be better. This only applies when we're operating 1401 * in sta mode and automatic roaming is set. 1402 * XXX defer if busy 1403 * XXX repeater station 1404 * XXX do when !bgscan? 1405 */ 1406 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1407 ("wrong mode %u", vap->iv_opmode)); 1408 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1409 (vap->iv_flags & IEEE80211_F_BGSCAN) && 1410 vap->iv_state >= IEEE80211_S_RUN) 1411 /* XXX vap is implicit */ 1412 sta_roam_check(ss, vap); 1413 } 1414 1415 /* 1416 * Iterate over the entries in the scan cache, invoking 1417 * the callback function on each one. 1418 */ 1419 static void 1420 sta_iterate(struct ieee80211_scan_state *ss, 1421 ieee80211_scan_iter_func *f, void *arg) 1422 { 1423 struct sta_table *st = ss->ss_priv; 1424 struct sta_entry *se; 1425 u_int gen; 1426 1427 IEEE80211_SCAN_ITER_LOCK(st); 1428 gen = st->st_scaniter++; 1429 restart: 1430 IEEE80211_SCAN_TABLE_LOCK(st); 1431 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1432 if (se->se_scangen != gen) { 1433 se->se_scangen = gen; 1434 /* update public state */ 1435 se->base.se_age = ticks - se->se_lastupdate; 1436 IEEE80211_SCAN_TABLE_UNLOCK(st); 1437 (*f)(arg, &se->base); 1438 goto restart; 1439 } 1440 } 1441 IEEE80211_SCAN_TABLE_UNLOCK(st); 1442 1443 IEEE80211_SCAN_ITER_UNLOCK(st); 1444 } 1445 1446 static void 1447 sta_assoc_fail(struct ieee80211_scan_state *ss, 1448 const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1449 { 1450 struct sta_table *st = ss->ss_priv; 1451 struct sta_entry *se; 1452 1453 se = sta_lookup(st, macaddr); 1454 if (se != NULL) { 1455 se->se_fails++; 1456 se->se_lastfail = ticks; 1457 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1458 macaddr, "%s: reason %u fails %u", 1459 __func__, reason, se->se_fails); 1460 } 1461 } 1462 1463 static void 1464 sta_assoc_success(struct ieee80211_scan_state *ss, 1465 const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1466 { 1467 struct sta_table *st = ss->ss_priv; 1468 struct sta_entry *se; 1469 1470 se = sta_lookup(st, macaddr); 1471 if (se != NULL) { 1472 #if 0 1473 se->se_fails = 0; 1474 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1475 macaddr, "%s: fails %u", 1476 __func__, se->se_fails); 1477 #endif 1478 se->se_lastassoc = ticks; 1479 } 1480 } 1481 1482 static const struct ieee80211_scanner sta_default = { 1483 .scan_name = "default", 1484 .scan_attach = sta_attach, 1485 .scan_detach = sta_detach, 1486 .scan_start = sta_start, 1487 .scan_restart = sta_restart, 1488 .scan_cancel = sta_cancel, 1489 .scan_end = sta_pick_bss, 1490 .scan_flush = sta_flush, 1491 .scan_add = sta_add, 1492 .scan_age = sta_age, 1493 .scan_iterate = sta_iterate, 1494 .scan_assoc_fail = sta_assoc_fail, 1495 .scan_assoc_success = sta_assoc_success, 1496 }; 1497 IEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1498 1499 /* 1500 * Adhoc mode-specific support. 1501 */ 1502 1503 static const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1504 { 5180, 5200, 5220, 5240 }; 1505 static const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1506 { 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1507 static const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1508 { 5170, 5190, 5210, 5230 }; 1509 static const uint16_t adhoc11b[] = /* 10, 11 */ 1510 { 2457, 2462 }; 1511 1512 static const struct scanlist adhocScanTable[] = { 1513 { IEEE80211_MODE_11B, X(adhoc11b) }, 1514 { IEEE80211_MODE_11A, X(adhocWorld) }, 1515 { IEEE80211_MODE_11A, X(adhocFcc3) }, 1516 { IEEE80211_MODE_11B, X(adhocMkk) }, 1517 { .list = NULL } 1518 }; 1519 #undef X 1520 1521 /* 1522 * Start an adhoc-mode scan by populating the channel list. 1523 */ 1524 static int 1525 adhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1526 { 1527 struct sta_table *st = ss->ss_priv; 1528 1529 makescanlist(ss, vap, adhocScanTable); 1530 1531 if (ss->ss_mindwell == 0) 1532 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1533 if (ss->ss_maxdwell == 0) 1534 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1535 1536 st->st_scangen++; 1537 st->st_newscan = 1; 1538 1539 return 0; 1540 } 1541 1542 /* 1543 * Select a channel to start an adhoc network on. 1544 * The channel list was populated with appropriate 1545 * channels so select one that looks least occupied. 1546 */ 1547 static struct ieee80211_channel * 1548 adhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1549 { 1550 struct sta_table *st = ss->ss_priv; 1551 struct sta_entry *se; 1552 struct ieee80211_channel *c, *bestchan; 1553 int i, bestrssi, maxrssi; 1554 1555 bestchan = NULL; 1556 bestrssi = -1; 1557 1558 IEEE80211_SCAN_TABLE_LOCK(st); 1559 for (i = 0; i < ss->ss_last; i++) { 1560 c = ss->ss_chans[i]; 1561 /* never consider a channel with radar */ 1562 if (IEEE80211_IS_CHAN_RADAR(c)) 1563 continue; 1564 /* skip channels disallowed by regulatory settings */ 1565 if (IEEE80211_IS_CHAN_NOADHOC(c)) 1566 continue; 1567 /* check channel attributes for band compatibility */ 1568 if (flags != 0 && (c->ic_flags & flags) != flags) 1569 continue; 1570 maxrssi = 0; 1571 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1572 if (se->base.se_chan != c) 1573 continue; 1574 if (se->base.se_rssi > maxrssi) 1575 maxrssi = se->base.se_rssi; 1576 } 1577 if (bestchan == NULL || maxrssi < bestrssi) 1578 bestchan = c; 1579 } 1580 IEEE80211_SCAN_TABLE_UNLOCK(st); 1581 1582 return bestchan; 1583 } 1584 1585 /* 1586 * Pick an ibss network to join or find a channel 1587 * to use to start an ibss network. 1588 */ 1589 static int 1590 adhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1591 { 1592 struct sta_table *st = ss->ss_priv; 1593 struct sta_entry *selbs; 1594 struct ieee80211_channel *chan; 1595 struct ieee80211com *ic = vap->iv_ic; 1596 1597 KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1598 vap->iv_opmode == IEEE80211_M_AHDEMO || 1599 vap->iv_opmode == IEEE80211_M_MBSS, 1600 ("wrong opmode %u", vap->iv_opmode)); 1601 1602 if (st->st_newscan) { 1603 sta_update_notseen(st); 1604 st->st_newscan = 0; 1605 } 1606 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1607 /* 1608 * Manual/background scan, don't select+join the 1609 * bss, just return. The scanning framework will 1610 * handle notification that this has completed. 1611 */ 1612 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1613 return 1; 1614 } 1615 /* 1616 * Automatic sequencing; look for a candidate and 1617 * if found join the network. 1618 */ 1619 /* NB: unlocked read should be ok */ 1620 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1621 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1622 "%s: no scan candidate\n", __func__); 1623 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1624 return 0; 1625 notfound: 1626 /* NB: never auto-start a tdma network for slot !0 */ 1627 #ifdef IEEE80211_SUPPORT_TDMA 1628 if (vap->iv_des_nssid && 1629 ((vap->iv_caps & IEEE80211_C_TDMA) == 0 || 1630 ieee80211_tdma_getslot(vap) == 0)) { 1631 #else 1632 if (vap->iv_des_nssid) { 1633 #endif 1634 /* 1635 * No existing adhoc network to join and we have 1636 * an ssid; start one up. If no channel was 1637 * specified, try to select a channel. 1638 */ 1639 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1640 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1641 chan = adhoc_pick_channel(ss, 0); 1642 } else 1643 chan = vap->iv_des_chan; 1644 if (chan != NULL) { 1645 /* 1646 * Create a HT capable IBSS; the per-node 1647 * probe request/response will result in 1648 * "correct" rate control capabilities being 1649 * negotiated. 1650 */ 1651 chan = ieee80211_ht_adjust_channel(ic, 1652 chan, vap->iv_flags_ht); 1653 chan = ieee80211_vht_adjust_channel(ic, 1654 chan, vap->iv_flags_vht); 1655 ieee80211_create_ibss(vap, chan); 1656 return 1; 1657 } 1658 } 1659 /* 1660 * If nothing suitable was found decrement 1661 * the failure counts so entries will be 1662 * reconsidered the next time around. We 1663 * really want to do this only for sta's 1664 * where we've previously had some success. 1665 */ 1666 sta_dec_fails(st); 1667 st->st_newscan = 1; 1668 return 0; /* restart scan */ 1669 } 1670 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1671 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1672 return (selbs != NULL); 1673 if (selbs == NULL) 1674 goto notfound; 1675 chan = selbs->base.se_chan; 1676 if (selbs->se_flags & STA_DEMOTE11B) 1677 chan = demote11b(vap, chan); 1678 /* 1679 * If HT is available, make it a possibility here. 1680 * The intent is to enable HT20/HT40 when joining a non-HT 1681 * IBSS node; we can then advertise HT IEs and speak HT 1682 * to any subsequent nodes that support it. 1683 */ 1684 chan = ieee80211_ht_adjust_channel(ic, 1685 chan, vap->iv_flags_ht); 1686 chan = ieee80211_vht_adjust_channel(ic, 1687 chan, vap->iv_flags_vht); 1688 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1689 goto notfound; 1690 return 1; /* terminate scan */ 1691 } 1692 1693 /* 1694 * Age entries in the scan cache. 1695 */ 1696 static void 1697 adhoc_age(struct ieee80211_scan_state *ss) 1698 { 1699 struct sta_table *st = ss->ss_priv; 1700 struct sta_entry *se, *next; 1701 1702 IEEE80211_SCAN_TABLE_LOCK(st); 1703 TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 1704 if (se->se_notseen > STA_PURGE_SCANS) { 1705 TAILQ_REMOVE(&st->st_entry, se, se_list); 1706 LIST_REMOVE(se, se_hash); 1707 ieee80211_ies_cleanup(&se->base.se_ies); 1708 IEEE80211_FREE(se, M_80211_SCAN); 1709 } 1710 } 1711 IEEE80211_SCAN_TABLE_UNLOCK(st); 1712 } 1713 1714 static const struct ieee80211_scanner adhoc_default = { 1715 .scan_name = "default", 1716 .scan_attach = sta_attach, 1717 .scan_detach = sta_detach, 1718 .scan_start = adhoc_start, 1719 .scan_restart = sta_restart, 1720 .scan_cancel = sta_cancel, 1721 .scan_end = adhoc_pick_bss, 1722 .scan_flush = sta_flush, 1723 .scan_pickchan = adhoc_pick_channel, 1724 .scan_add = sta_add, 1725 .scan_age = adhoc_age, 1726 .scan_iterate = sta_iterate, 1727 .scan_assoc_fail = sta_assoc_fail, 1728 .scan_assoc_success = sta_assoc_success, 1729 }; 1730 IEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1731 IEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1732 1733 static int 1734 ap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1735 { 1736 struct sta_table *st = ss->ss_priv; 1737 1738 makescanlist(ss, vap, staScanTable); 1739 1740 if (ss->ss_mindwell == 0) 1741 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1742 if (ss->ss_maxdwell == 0) 1743 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1744 1745 st->st_scangen++; 1746 st->st_newscan = 1; 1747 1748 return 0; 1749 } 1750 1751 /* 1752 * Cancel an ongoing scan. 1753 */ 1754 static int 1755 ap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1756 { 1757 return 0; 1758 } 1759 1760 /* 1761 * Pick a quiet channel to use for ap operation. 1762 */ 1763 static struct ieee80211_channel * 1764 ap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1765 { 1766 struct sta_table *st = ss->ss_priv; 1767 struct ieee80211_channel *bestchan = NULL; 1768 int i; 1769 1770 /* XXX select channel more intelligently, e.g. channel spread, power */ 1771 /* NB: use scan list order to preserve channel preference */ 1772 for (i = 0; i < ss->ss_last; i++) { 1773 struct ieee80211_channel *chan = ss->ss_chans[i]; 1774 /* 1775 * If the channel is unoccupied the max rssi 1776 * should be zero; just take it. Otherwise 1777 * track the channel with the lowest rssi and 1778 * use that when all channels appear occupied. 1779 */ 1780 if (IEEE80211_IS_CHAN_RADAR(chan)) 1781 continue; 1782 if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1783 continue; 1784 /* check channel attributes for band compatibility */ 1785 if (flags != 0 && (chan->ic_flags & flags) != flags) 1786 continue; 1787 KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size")); 1788 /* XXX channel have interference */ 1789 if (st->st_maxrssi[chan->ic_ieee] == 0) { 1790 /* XXX use other considerations */ 1791 return chan; 1792 } 1793 if (bestchan == NULL || 1794 st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1795 bestchan = chan; 1796 } 1797 return bestchan; 1798 } 1799 1800 /* 1801 * Pick a quiet channel to use for ap operation. 1802 */ 1803 static int 1804 ap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1805 { 1806 struct ieee80211com *ic = vap->iv_ic; 1807 struct ieee80211_channel *bestchan, *chan; 1808 1809 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1810 ("wrong opmode %u", vap->iv_opmode)); 1811 bestchan = ap_pick_channel(ss, 0); 1812 if (bestchan == NULL) { 1813 /* no suitable channel, should not happen */ 1814 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1815 "%s: no suitable channel! (should not happen)\n", __func__); 1816 /* XXX print something? */ 1817 return 0; /* restart scan */ 1818 } 1819 /* 1820 * If this is a dynamic turbo channel, start with the unboosted one. 1821 */ 1822 if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1823 bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1824 bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1825 if (bestchan == NULL) { 1826 /* should never happen ?? */ 1827 return 0; 1828 } 1829 } 1830 if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1831 /* 1832 * Manual/background scan, don't select+join the 1833 * bss, just return. The scanning framework will 1834 * handle notification that this has completed. 1835 */ 1836 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1837 return 1; 1838 } 1839 chan = ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ht); 1840 chan = ieee80211_vht_adjust_channel(ic, chan, vap->iv_flags_vht); 1841 ieee80211_create_ibss(vap, chan); 1842 1843 return 1; 1844 } 1845 1846 static const struct ieee80211_scanner ap_default = { 1847 .scan_name = "default", 1848 .scan_attach = sta_attach, 1849 .scan_detach = sta_detach, 1850 .scan_start = ap_start, 1851 .scan_restart = sta_restart, 1852 .scan_cancel = ap_cancel, 1853 .scan_end = ap_end, 1854 .scan_flush = sta_flush, 1855 .scan_pickchan = ap_pick_channel, 1856 .scan_add = sta_add, 1857 .scan_age = adhoc_age, 1858 .scan_iterate = sta_iterate, 1859 .scan_assoc_success = sta_assoc_success, 1860 .scan_assoc_fail = sta_assoc_fail, 1861 }; 1862 IEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1863 1864 #ifdef IEEE80211_SUPPORT_MESH 1865 /* 1866 * Pick an mbss network to join or find a channel 1867 * to use to start an mbss network. 1868 */ 1869 static int 1870 mesh_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1871 { 1872 struct sta_table *st = ss->ss_priv; 1873 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1874 struct sta_entry *selbs; 1875 struct ieee80211_channel *chan; 1876 1877 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1878 ("wrong opmode %u", vap->iv_opmode)); 1879 1880 if (st->st_newscan) { 1881 sta_update_notseen(st); 1882 st->st_newscan = 0; 1883 } 1884 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1885 /* 1886 * Manual/background scan, don't select+join the 1887 * bss, just return. The scanning framework will 1888 * handle notification that this has completed. 1889 */ 1890 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1891 return 1; 1892 } 1893 /* 1894 * Automatic sequencing; look for a candidate and 1895 * if found join the network. 1896 */ 1897 /* NB: unlocked read should be ok */ 1898 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1899 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1900 "%s: no scan candidate\n", __func__); 1901 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1902 return 0; 1903 notfound: 1904 if (ms->ms_idlen != 0) { 1905 /* 1906 * No existing mbss network to join and we have 1907 * a meshid; start one up. If no channel was 1908 * specified, try to select a channel. 1909 */ 1910 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1911 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1912 struct ieee80211com *ic = vap->iv_ic; 1913 1914 /* XXX VHT */ 1915 chan = adhoc_pick_channel(ss, 0); 1916 if (chan != NULL) { 1917 chan = ieee80211_ht_adjust_channel(ic, 1918 chan, vap->iv_flags_ht); 1919 chan = ieee80211_vht_adjust_channel(ic, 1920 chan, vap->iv_flags_vht); 1921 } 1922 } else 1923 chan = vap->iv_des_chan; 1924 if (chan != NULL) { 1925 ieee80211_create_ibss(vap, chan); 1926 return 1; 1927 } 1928 } 1929 /* 1930 * If nothing suitable was found decrement 1931 * the failure counts so entries will be 1932 * reconsidered the next time around. We 1933 * really want to do this only for sta's 1934 * where we've previously had some success. 1935 */ 1936 sta_dec_fails(st); 1937 st->st_newscan = 1; 1938 return 0; /* restart scan */ 1939 } 1940 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1941 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1942 return (selbs != NULL); 1943 if (selbs == NULL) 1944 goto notfound; 1945 chan = selbs->base.se_chan; 1946 if (selbs->se_flags & STA_DEMOTE11B) 1947 chan = demote11b(vap, chan); 1948 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1949 goto notfound; 1950 return 1; /* terminate scan */ 1951 } 1952 1953 static const struct ieee80211_scanner mesh_default = { 1954 .scan_name = "default", 1955 .scan_attach = sta_attach, 1956 .scan_detach = sta_detach, 1957 .scan_start = adhoc_start, 1958 .scan_restart = sta_restart, 1959 .scan_cancel = sta_cancel, 1960 .scan_end = mesh_pick_bss, 1961 .scan_flush = sta_flush, 1962 .scan_pickchan = adhoc_pick_channel, 1963 .scan_add = sta_add, 1964 .scan_age = adhoc_age, 1965 .scan_iterate = sta_iterate, 1966 .scan_assoc_fail = sta_assoc_fail, 1967 .scan_assoc_success = sta_assoc_success, 1968 }; 1969 IEEE80211_SCANNER_ALG(mesh, IEEE80211_M_MBSS, mesh_default); 1970 #endif /* IEEE80211_SUPPORT_MESH */ 1971