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 * $FreeBSD: head/sys/net80211/ieee80211_scan_sta.c 196005 2009-07-31 19:13:16Z sam $ 26 * $DragonFly$ 27 */ 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 #include <sys/lock.h> 39 40 #include <sys/socket.h> 41 42 #include <net/if.h> 43 #include <net/if_media.h> 44 #include <net/ethernet.h> 45 #include <net/route.h> 46 47 #include <netproto/802_11/ieee80211_var.h> 48 #include <netproto/802_11/ieee80211_input.h> 49 #include <netproto/802_11/ieee80211_regdomain.h> 50 #ifdef IEEE80211_SUPPORT_TDMA 51 #include <netproto/802_11/ieee80211_tdma.h> 52 #endif 53 #ifdef IEEE80211_SUPPORT_MESH 54 #include <netproto/802_11/ieee80211_mesh.h> 55 #endif 56 57 #include <net/bpf.h> 58 59 /* 60 * Parameters for managing cache entries: 61 * 62 * o a station with STA_FAILS_MAX failures is not considered 63 * when picking a candidate 64 * o a station that hasn't had an update in STA_PURGE_SCANS 65 * (background) scans is discarded 66 * o after STA_FAILS_AGE seconds we clear the failure count 67 */ 68 #define STA_FAILS_MAX 2 /* assoc failures before ignored */ 69 #define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */ 70 #define STA_PURGE_SCANS 2 /* age for purging entries (scans) */ 71 72 /* XXX tunable */ 73 #define STA_RSSI_MIN 8 /* min acceptable rssi */ 74 #define STA_RSSI_MAX 40 /* max rssi for comparison */ 75 76 struct sta_entry { 77 struct ieee80211_scan_entry base; 78 TAILQ_ENTRY(sta_entry) se_list; 79 LIST_ENTRY(sta_entry) se_hash; 80 uint8_t se_fails; /* failure to associate count */ 81 uint8_t se_seen; /* seen during current scan */ 82 uint8_t se_notseen; /* not seen in previous scans */ 83 uint8_t se_flags; 84 #define STA_DEMOTE11B 0x01 /* match w/ demoted 11b chan */ 85 uint32_t se_avgrssi; /* LPF rssi state */ 86 unsigned long se_lastupdate; /* time of last update */ 87 unsigned long se_lastfail; /* time of last failure */ 88 unsigned long se_lastassoc; /* time of last association */ 89 u_int se_scangen; /* iterator scan gen# */ 90 u_int se_countrygen; /* gen# of last cc notify */ 91 }; 92 93 #define STA_HASHSIZE 32 94 /* simple hash is enough for variation of macaddr */ 95 #define STA_HASH(addr) \ 96 (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE) 97 98 #define MAX_IEEE_CHAN 256 /* max acceptable IEEE chan # */ 99 CTASSERT(MAX_IEEE_CHAN >= 256); 100 101 struct sta_table { 102 struct lock st_lock; /* on scan table */ 103 TAILQ_HEAD(, sta_entry) st_entry; /* all entries */ 104 LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE]; 105 struct lock st_scanlock; /* on st_scaniter */ 106 u_int st_scaniter; /* gen# for iterator */ 107 u_int st_scangen; /* scan generation # */ 108 int st_newscan; 109 /* ap-related state */ 110 int st_maxrssi[MAX_IEEE_CHAN]; 111 }; 112 113 static void sta_flush_table(struct sta_table *); 114 /* 115 * match_bss returns a bitmask describing if an entry is suitable 116 * for use. If non-zero the entry was deemed not suitable and it's 117 * contents explains why. The following flags are or'd to to this 118 * mask and can be used to figure out why the entry was rejected. 119 */ 120 #define MATCH_CHANNEL 0x00001 /* channel mismatch */ 121 #define MATCH_CAPINFO 0x00002 /* capabilities mismatch, e.g. no ess */ 122 #define MATCH_PRIVACY 0x00004 /* privacy mismatch */ 123 #define MATCH_RATE 0x00008 /* rate set mismatch */ 124 #define MATCH_SSID 0x00010 /* ssid mismatch */ 125 #define MATCH_BSSID 0x00020 /* bssid mismatch */ 126 #define MATCH_FAILS 0x00040 /* too many failed auth attempts */ 127 #define MATCH_NOTSEEN 0x00080 /* not seen in recent scans */ 128 #define MATCH_RSSI 0x00100 /* rssi deemed too low to use */ 129 #define MATCH_CC 0x00200 /* country code mismatch */ 130 #define MATCH_TDMA_NOIE 0x00400 /* no TDMA ie */ 131 #define MATCH_TDMA_NOTMASTER 0x00800 /* not TDMA master */ 132 #define MATCH_TDMA_NOSLOT 0x01000 /* all TDMA slots occupied */ 133 #define MATCH_TDMA_LOCAL 0x02000 /* local address */ 134 #define MATCH_TDMA_VERSION 0x04000 /* protocol version mismatch */ 135 #define MATCH_MESH_NOID 0x10000 /* no MESHID ie */ 136 #define MATCH_MESHID 0x20000 /* meshid mismatch */ 137 static int match_bss(struct ieee80211vap *, 138 const struct ieee80211_scan_state *, struct sta_entry *, int); 139 static void adhoc_age(struct ieee80211_scan_state *); 140 141 static __inline int 142 isocmp(const uint8_t cc1[], const uint8_t cc2[]) 143 { 144 return (cc1[0] == cc2[0] && cc1[1] == cc2[1]); 145 } 146 147 /* number of references from net80211 layer */ 148 static int nrefs = 0; 149 /* 150 * Module glue. 151 */ 152 IEEE80211_SCANNER_MODULE(sta, 1); 153 154 /* 155 * Attach prior to any scanning work. 156 */ 157 static int 158 sta_attach(struct ieee80211_scan_state *ss) 159 { 160 struct sta_table *st; 161 162 st = (struct sta_table *) kmalloc(sizeof(struct sta_table), 163 M_80211_SCAN, M_INTWAIT | M_ZERO); 164 if (st == NULL) 165 return 0; 166 lockinit(&st->st_lock, "scantable", 0, 0); 167 lockinit(&st->st_scanlock, "scangen", 0, 0); 168 TAILQ_INIT(&st->st_entry); 169 ss->ss_priv = st; 170 nrefs++; /* NB: we assume caller locking */ 171 return 1; 172 } 173 174 /* 175 * Cleanup any private state. 176 */ 177 static int 178 sta_detach(struct ieee80211_scan_state *ss) 179 { 180 struct sta_table *st = ss->ss_priv; 181 182 if (st != NULL) { 183 sta_flush_table(st); 184 lockuninit(&st->st_lock); 185 lockuninit(&st->st_scanlock); 186 kfree(st, M_80211_SCAN); 187 KASSERT(nrefs > 0, ("imbalanced attach/detach")); 188 nrefs--; /* NB: we assume caller locking */ 189 } 190 return 1; 191 } 192 193 /* 194 * Flush all per-scan state. 195 */ 196 static int 197 sta_flush(struct ieee80211_scan_state *ss) 198 { 199 struct sta_table *st = ss->ss_priv; 200 201 lockmgr(&st->st_lock, LK_EXCLUSIVE); 202 sta_flush_table(st); 203 lockmgr(&st->st_lock, LK_RELEASE); 204 ss->ss_last = 0; 205 return 0; 206 } 207 208 /* 209 * Flush all entries in the scan cache. 210 */ 211 static void 212 sta_flush_table(struct sta_table *st) 213 { 214 struct sta_entry *se, *next; 215 216 TAILQ_FOREACH_MUTABLE(se, &st->st_entry, se_list, next) { 217 TAILQ_REMOVE(&st->st_entry, se, se_list); 218 LIST_REMOVE(se, se_hash); 219 ieee80211_ies_cleanup(&se->base.se_ies); 220 kfree(se, M_80211_SCAN); 221 } 222 memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi)); 223 } 224 225 /* 226 * Process a beacon or probe response frame; create an 227 * entry in the scan cache or update any previous entry. 228 */ 229 static int 230 sta_add(struct ieee80211_scan_state *ss, 231 const struct ieee80211_scanparams *sp, 232 const struct ieee80211_frame *wh, 233 int subtype, int rssi, int noise) 234 { 235 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 236 #define PICK1ST(_ss) \ 237 ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \ 238 IEEE80211_SCAN_PICK1ST) 239 struct sta_table *st = ss->ss_priv; 240 const uint8_t *macaddr = wh->i_addr2; 241 struct ieee80211vap *vap = ss->ss_vap; 242 struct ieee80211com *ic = vap->iv_ic; 243 struct sta_entry *se; 244 struct ieee80211_scan_entry *ise; 245 int hash; 246 247 hash = STA_HASH(macaddr); 248 249 lockmgr(&st->st_lock, LK_EXCLUSIVE); 250 LIST_FOREACH(se, &st->st_hash[hash], se_hash) 251 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 252 goto found; 253 se = (struct sta_entry *) kmalloc(sizeof(struct sta_entry), 254 M_80211_SCAN, M_INTWAIT | M_ZERO); 255 if (se == NULL) { 256 lockmgr(&st->st_lock, LK_RELEASE); 257 return 0; 258 } 259 se->se_scangen = st->st_scaniter-1; 260 se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER; 261 IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr); 262 TAILQ_INSERT_TAIL(&st->st_entry, se, se_list); 263 LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash); 264 found: 265 ise = &se->base; 266 /* XXX ap beaconing multiple ssid w/ same bssid */ 267 if (sp->ssid[1] != 0 && 268 (ISPROBE(subtype) || ise->se_ssid[1] == 0)) 269 memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]); 270 KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE, 271 ("rate set too large: %u", sp->rates[1])); 272 memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]); 273 if (sp->xrates != NULL) { 274 /* XXX validate xrates[1] */ 275 KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE, 276 ("xrate set too large: %u", sp->xrates[1])); 277 memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]); 278 } else 279 ise->se_xrates[1] = 0; 280 IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3); 281 if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) { 282 /* 283 * Record rssi data using extended precision LPF filter. 284 * 285 * NB: use only on-channel data to insure we get a good 286 * estimate of the signal we'll see when associated. 287 */ 288 IEEE80211_RSSI_LPF(se->se_avgrssi, rssi); 289 ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi); 290 ise->se_noise = noise; 291 } 292 memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp)); 293 ise->se_intval = sp->bintval; 294 ise->se_capinfo = sp->capinfo; 295 #ifdef IEEE80211_SUPPORT_MESH 296 if (sp->meshid != NULL && sp->meshid[1] != 0) 297 memcpy(ise->se_meshid, sp->meshid, 2+sp->meshid[1]); 298 #endif 299 /* 300 * Beware of overriding se_chan for frames seen 301 * off-channel; this can cause us to attempt an 302 * association on the wrong channel. 303 */ 304 if (sp->status & IEEE80211_BPARSE_OFFCHAN) { 305 struct ieee80211_channel *c; 306 /* 307 * Off-channel, locate the home/bss channel for the sta 308 * using the value broadcast in the DSPARMS ie. We know 309 * sp->chan has this value because it's used to calculate 310 * IEEE80211_BPARSE_OFFCHAN. 311 */ 312 c = ieee80211_find_channel_byieee(ic, sp->chan, 313 ic->ic_curchan->ic_flags); 314 if (c != NULL) { 315 ise->se_chan = c; 316 } else if (ise->se_chan == NULL) { 317 /* should not happen, pick something */ 318 ise->se_chan = ic->ic_curchan; 319 } 320 } else 321 ise->se_chan = ic->ic_curchan; 322 ise->se_fhdwell = sp->fhdwell; 323 ise->se_fhindex = sp->fhindex; 324 ise->se_erp = sp->erp; 325 ise->se_timoff = sp->timoff; 326 if (sp->tim != NULL) { 327 const struct ieee80211_tim_ie *tim = 328 (const struct ieee80211_tim_ie *) sp->tim; 329 ise->se_dtimperiod = tim->tim_period; 330 } 331 if (sp->country != NULL) { 332 const struct ieee80211_country_ie *cie = 333 (const struct ieee80211_country_ie *) sp->country; 334 /* 335 * If 11d is enabled and we're attempting to join a bss 336 * that advertises it's country code then compare our 337 * current settings to what we fetched from the country ie. 338 * If our country code is unspecified or different then 339 * dispatch an event to user space that identifies the 340 * country code so our regdomain config can be changed. 341 */ 342 /* XXX only for STA mode? */ 343 if ((IEEE80211_IS_CHAN_11D(ise->se_chan) || 344 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 345 (ic->ic_regdomain.country == CTRY_DEFAULT || 346 !isocmp(cie->cc, ic->ic_regdomain.isocc))) { 347 /* only issue one notify event per scan */ 348 if (se->se_countrygen != st->st_scangen) { 349 ieee80211_notify_country(vap, ise->se_bssid, 350 cie->cc); 351 se->se_countrygen = st->st_scangen; 352 } 353 } 354 ise->se_cc[0] = cie->cc[0]; 355 ise->se_cc[1] = cie->cc[1]; 356 } 357 /* NB: no need to setup ie ptrs; they are not (currently) used */ 358 (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len); 359 360 /* clear failure count after STA_FAIL_AGE passes */ 361 if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) { 362 se->se_fails = 0; 363 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr, 364 "%s: fails %u", __func__, se->se_fails); 365 } 366 367 se->se_lastupdate = ticks; /* update time */ 368 se->se_seen = 1; 369 se->se_notseen = 0; 370 371 KASSERT(sizeof(sp->bchan) == 1, ("bchan size")); 372 if (rssi > st->st_maxrssi[sp->bchan]) 373 st->st_maxrssi[sp->bchan] = rssi; 374 375 lockmgr(&st->st_lock, LK_RELEASE); 376 377 /* 378 * If looking for a quick choice and nothing's 379 * been found check here. 380 */ 381 if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0) 382 ss->ss_flags |= IEEE80211_SCAN_GOTPICK; 383 384 return 1; 385 #undef PICK1ST 386 #undef ISPROBE 387 } 388 389 /* 390 * Check if a channel is excluded by user request. 391 */ 392 static int 393 isexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c) 394 { 395 return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) || 396 (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 397 c->ic_freq != vap->iv_des_chan->ic_freq)); 398 } 399 400 static struct ieee80211_channel * 401 find11gchannel(struct ieee80211com *ic, int i, int freq) 402 { 403 struct ieee80211_channel *c; 404 int j; 405 406 /* 407 * The normal ordering in the channel list is b channel 408 * immediately followed by g so optimize the search for 409 * this. We'll still do a full search just in case. 410 */ 411 for (j = i+1; j < ic->ic_nchans; j++) { 412 c = &ic->ic_channels[j]; 413 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 414 return c; 415 } 416 for (j = 0; j < i; j++) { 417 c = &ic->ic_channels[j]; 418 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 419 return c; 420 } 421 return NULL; 422 } 423 424 static const u_int chanflags[IEEE80211_MODE_MAX] = { 425 [IEEE80211_MODE_AUTO] = IEEE80211_CHAN_B, 426 [IEEE80211_MODE_11A] = IEEE80211_CHAN_A, 427 [IEEE80211_MODE_11B] = IEEE80211_CHAN_B, 428 [IEEE80211_MODE_11G] = IEEE80211_CHAN_G, 429 [IEEE80211_MODE_FH] = IEEE80211_CHAN_FHSS, 430 /* check base channel */ 431 [IEEE80211_MODE_TURBO_A] = IEEE80211_CHAN_A, 432 [IEEE80211_MODE_TURBO_G] = IEEE80211_CHAN_G, 433 [IEEE80211_MODE_STURBO_A] = IEEE80211_CHAN_ST, 434 [IEEE80211_MODE_HALF] = IEEE80211_CHAN_HALF, 435 [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_QUARTER, 436 /* check legacy */ 437 [IEEE80211_MODE_11NA] = IEEE80211_CHAN_A, 438 [IEEE80211_MODE_11NG] = IEEE80211_CHAN_G, 439 }; 440 441 static void 442 add_channels(struct ieee80211vap *vap, 443 struct ieee80211_scan_state *ss, 444 enum ieee80211_phymode mode, const uint16_t freq[], int nfreq) 445 { 446 struct ieee80211com *ic = vap->iv_ic; 447 struct ieee80211_channel *c, *cg; 448 u_int modeflags; 449 int i; 450 451 KASSERT(mode < NELEM(chanflags), ("Unexpected mode %u", mode)); 452 modeflags = chanflags[mode]; 453 for (i = 0; i < nfreq; i++) { 454 if (ss->ss_last >= IEEE80211_SCAN_MAX) 455 break; 456 457 c = ieee80211_find_channel(ic, freq[i], modeflags); 458 if (c == NULL || isexcluded(vap, c)) 459 continue; 460 if (mode == IEEE80211_MODE_AUTO) { 461 /* 462 * XXX special-case 11b/g channels so we select 463 * the g channel if both are present. 464 */ 465 if (IEEE80211_IS_CHAN_B(c) && 466 (cg = find11gchannel(ic, i, c->ic_freq)) != NULL) 467 c = cg; 468 } 469 ss->ss_chans[ss->ss_last++] = c; 470 } 471 } 472 473 struct scanlist { 474 uint16_t mode; 475 uint16_t count; 476 const uint16_t *list; 477 }; 478 479 static int 480 checktable(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 } 491 492 static int 493 onscanlist(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 } 503 504 static void 505 sweepchannels(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 } 568 569 static void 570 makescanlist(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 } 629 630 static const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 631 { 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 632 static const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 633 { 5170, 5190, 5210, 5230 }; 634 static const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 635 { 2412, 2437, 2462, 2442, 2472 }; 636 static const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 637 { 5745, 5765, 5785, 5805, 5825 }; 638 static 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 }; 640 static const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 641 { 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 642 static const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 643 { 2484 }; 644 static const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 645 { 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 646 static 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 649 static const uint16_t rcl5[] = /* 3 static turbo channels */ 650 { 5210, 5250, 5290 }; 651 static const uint16_t rcl6[] = /* 2 static turbo channels */ 652 { 5760, 5800 }; 653 static const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 654 { 5540, 5580, 5620, 5660 }; 655 static const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 656 { 2437 }; 657 static const uint16_t rcl13[] = /* dynamic Turbo channels */ 658 { 5200, 5240, 5280, 5765, 5805 }; 659 #endif /* ATH_TURBO_SCAN */ 660 661 #define X(a) .count = NELEM(a), .list = a 662 663 static 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 */ 688 static int 689 sta_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 */ 710 static int 711 sta_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 */ 722 static int 723 sta_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 */ 738 static struct ieee80211_channel * 739 demote11b(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 } 753 754 static int 755 maxrate(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 */ 801 static int 802 sta_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 #define ABS(_a) ((_a) < 0 ? -(_a) : (_a)) 809 int maxa, maxb; 810 int8_t rssia, rssib; 811 int weight; 812 813 /* privacy support */ 814 PREFER(a->base.se_capinfo, b->base.se_capinfo, 815 IEEE80211_CAPINFO_PRIVACY); 816 817 /* compare count of previous failures */ 818 weight = b->se_fails - a->se_fails; 819 if (ABS(weight) > 1) 820 return weight; 821 822 /* 823 * Compare rssi. If the two are considered equivalent 824 * then fallback to other criteria. We threshold the 825 * comparisons to avoid selecting an ap purely by rssi 826 * when both values may be good but one ap is otherwise 827 * more desirable (e.g. an 11b-only ap with stronger 828 * signal than an 11g ap). 829 */ 830 rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 831 rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 832 if (ABS(rssib - rssia) < 5) { 833 /* best/max rate preferred if signal level close enough XXX */ 834 maxa = maxrate(&a->base); 835 maxb = maxrate(&b->base); 836 if (maxa != maxb) 837 return maxa - maxb; 838 /* XXX use freq for channel preference */ 839 /* for now just prefer 5Ghz band to all other bands */ 840 PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 841 IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 842 } 843 /* all things being equal, use signal level */ 844 return a->base.se_rssi - b->base.se_rssi; 845 #undef PREFER 846 #undef ABS 847 } 848 849 /* 850 * Check rate set suitability and return the best supported rate. 851 * XXX inspect MCS for HT 852 */ 853 static int 854 check_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, 855 const struct ieee80211_scan_entry *se) 856 { 857 #define RV(v) ((v) & IEEE80211_RATE_VAL) 858 const struct ieee80211_rateset *srs; 859 int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 860 const uint8_t *rs; 861 862 okrate = badrate = 0; 863 864 srs = ieee80211_get_suprates(vap->iv_ic, chan); 865 nrs = se->se_rates[1]; 866 rs = se->se_rates+2; 867 /* XXX MCS */ 868 ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; 869 fixedrate = IEEE80211_FIXED_RATE_NONE; 870 again: 871 for (i = 0; i < nrs; i++) { 872 r = RV(rs[i]); 873 badrate = r; 874 /* 875 * Check any fixed rate is included. 876 */ 877 if (r == ucastrate) 878 fixedrate = r; 879 /* 880 * Check against our supported rates. 881 */ 882 for (j = 0; j < srs->rs_nrates; j++) 883 if (r == RV(srs->rs_rates[j])) { 884 if (r > okrate) /* NB: track max */ 885 okrate = r; 886 break; 887 } 888 889 if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 890 /* 891 * Don't try joining a BSS, if we don't support 892 * one of its basic rates. 893 */ 894 okrate = 0; 895 goto back; 896 } 897 } 898 if (rs == se->se_rates+2) { 899 /* scan xrates too; sort of an algol68-style for loop */ 900 nrs = se->se_xrates[1]; 901 rs = se->se_xrates+2; 902 goto again; 903 } 904 905 back: 906 if (okrate == 0 || ucastrate != fixedrate) 907 return badrate | IEEE80211_RATE_BASIC; 908 else 909 return RV(okrate); 910 #undef RV 911 } 912 913 static __inline int 914 match_id(const uint8_t *ie, const uint8_t *val, int len) 915 { 916 return (ie[1] == len && memcmp(ie+2, val, len) == 0); 917 } 918 919 static int 920 match_ssid(const uint8_t *ie, 921 int nssid, const struct ieee80211_scan_ssid ssids[]) 922 { 923 int i; 924 925 for (i = 0; i < nssid; i++) { 926 if (match_id(ie, ssids[i].ssid, ssids[i].len)) 927 return 1; 928 } 929 return 0; 930 } 931 932 #ifdef IEEE80211_SUPPORT_TDMA 933 static int 934 tdma_isfull(const struct ieee80211_tdma_param *tdma) 935 { 936 int slot, slotcnt; 937 938 slotcnt = tdma->tdma_slotcnt; 939 for (slot = slotcnt-1; slot >= 0; slot--) 940 if (isclr(tdma->tdma_inuse, slot)) 941 return 0; 942 return 1; 943 } 944 #endif /* IEEE80211_SUPPORT_TDMA */ 945 946 /* 947 * Test a scan candidate for suitability/compatibility. 948 */ 949 static int 950 match_bss(struct ieee80211vap *vap, 951 const struct ieee80211_scan_state *ss, struct sta_entry *se0, 952 int debug) 953 { 954 struct ieee80211com *ic = vap->iv_ic; 955 struct ieee80211_scan_entry *se = &se0->base; 956 uint8_t rate; 957 int fail; 958 959 fail = 0; 960 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 961 fail |= MATCH_CHANNEL; 962 /* 963 * NB: normally the desired mode is used to construct 964 * the channel list, but it's possible for the scan 965 * cache to include entries for stations outside this 966 * list so we check the desired mode here to weed them 967 * out. 968 */ 969 if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 970 (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 971 chanflags[vap->iv_des_mode]) 972 fail |= MATCH_CHANNEL; 973 if (vap->iv_opmode == IEEE80211_M_IBSS) { 974 if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 975 fail |= MATCH_CAPINFO; 976 #ifdef IEEE80211_SUPPORT_TDMA 977 } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) { 978 /* 979 * Adhoc demo network setup shouldn't really be scanning 980 * but just in case skip stations operating in IBSS or 981 * BSS mode. 982 */ 983 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 984 fail |= MATCH_CAPINFO; 985 /* 986 * TDMA operation cannot coexist with a normal 802.11 network; 987 * skip if IBSS or ESS capabilities are marked and require 988 * the beacon have a TDMA ie present. 989 */ 990 if (vap->iv_caps & IEEE80211_C_TDMA) { 991 const struct ieee80211_tdma_param *tdma = 992 (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie; 993 const struct ieee80211_tdma_state *ts = vap->iv_tdma; 994 995 if (tdma == NULL) 996 fail |= MATCH_TDMA_NOIE; 997 else if (tdma->tdma_version != ts->tdma_version) 998 fail |= MATCH_TDMA_VERSION; 999 else if (tdma->tdma_slot != 0) 1000 fail |= MATCH_TDMA_NOTMASTER; 1001 else if (tdma_isfull(tdma)) 1002 fail |= MATCH_TDMA_NOSLOT; 1003 #if 0 1004 else if (ieee80211_local_address(se->se_macaddr)) 1005 fail |= MATCH_TDMA_LOCAL; 1006 #endif 1007 } 1008 #endif /* IEEE80211_SUPPORT_TDMA */ 1009 #ifdef IEEE80211_SUPPORT_MESH 1010 } else if (vap->iv_opmode == IEEE80211_M_MBSS) { 1011 const struct ieee80211_mesh_state *ms = vap->iv_mesh; 1012 /* 1013 * Mesh nodes have IBSS & ESS bits in capinfo turned off 1014 * and two special ie's that must be present. 1015 */ 1016 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1017 fail |= MATCH_CAPINFO; 1018 else if (&se->se_meshid == NULL) 1019 fail |= MATCH_MESH_NOID; 1020 else if (ms->ms_idlen != 0 && 1021 match_id(se->se_meshid, ms->ms_id, ms->ms_idlen)) 1022 fail |= MATCH_MESHID; 1023 #endif 1024 } else { 1025 if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 1026 fail |= MATCH_CAPINFO; 1027 /* 1028 * If 11d is enabled and we're attempting to join a bss 1029 * that advertises it's country code then compare our 1030 * current settings to what we fetched from the country ie. 1031 * If our country code is unspecified or different then do 1032 * not attempt to join the bss. We should have already 1033 * dispatched an event to user space that identifies the 1034 * new country code so our regdomain config should match. 1035 */ 1036 if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 1037 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 1038 se->se_cc[0] != 0 && 1039 (ic->ic_regdomain.country == CTRY_DEFAULT || 1040 !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 1041 fail |= MATCH_CC; 1042 } 1043 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1044 if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 1045 fail |= MATCH_PRIVACY; 1046 } else { 1047 /* XXX does this mean privacy is supported or required? */ 1048 if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 1049 fail |= MATCH_PRIVACY; 1050 } 1051 se0->se_flags &= ~STA_DEMOTE11B; 1052 rate = check_rate(vap, se->se_chan, se); 1053 if (rate & IEEE80211_RATE_BASIC) { 1054 fail |= MATCH_RATE; 1055 /* 1056 * An 11b-only ap will give a rate mismatch if there is an 1057 * OFDM fixed tx rate for 11g. Try downgrading the channel 1058 * in the scan list to 11b and retry the rate check. 1059 */ 1060 if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { 1061 rate = check_rate(vap, demote11b(vap, se->se_chan), se); 1062 if ((rate & IEEE80211_RATE_BASIC) == 0) { 1063 fail &= ~MATCH_RATE; 1064 se0->se_flags |= STA_DEMOTE11B; 1065 } 1066 } 1067 } else if (rate < 2*24) { 1068 /* 1069 * This is an 11b-only ap. Check the desired mode in 1070 * case that needs to be honored (mode 11g filters out 1071 * 11b-only ap's). Otherwise force any 11g channel used 1072 * in scanning to be demoted. 1073 * 1074 * NB: we cheat a bit here by looking at the max rate; 1075 * we could/should check the rates. 1076 */ 1077 if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || 1078 vap->iv_des_mode == IEEE80211_MODE_11B)) 1079 fail |= MATCH_RATE; 1080 else 1081 se0->se_flags |= STA_DEMOTE11B; 1082 } 1083 if (ss->ss_nssid != 0 && 1084 !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 1085 fail |= MATCH_SSID; 1086 if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 1087 !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 1088 fail |= MATCH_BSSID; 1089 if (se0->se_fails >= STA_FAILS_MAX) 1090 fail |= MATCH_FAILS; 1091 if (se0->se_notseen >= STA_PURGE_SCANS) 1092 fail |= MATCH_NOTSEEN; 1093 if (se->se_rssi < STA_RSSI_MIN) 1094 fail |= MATCH_RSSI; 1095 #ifdef IEEE80211_DEBUG 1096 if (ieee80211_msg(vap, debug)) { 1097 kprintf(" %c %6D", 1098 fail & MATCH_FAILS ? '=' : 1099 fail & MATCH_NOTSEEN ? '^' : 1100 fail & MATCH_CC ? '$' : 1101 #ifdef IEEE80211_SUPPORT_TDMA 1102 fail & MATCH_TDMA_NOIE ? '&' : 1103 fail & MATCH_TDMA_VERSION ? 'v' : 1104 fail & MATCH_TDMA_NOTMASTER ? 's' : 1105 fail & MATCH_TDMA_NOSLOT ? 'f' : 1106 fail & MATCH_TDMA_LOCAL ? 'l' : 1107 #endif 1108 fail & MATCH_MESH_NOID ? 'm' : 1109 fail ? '-' : '+', se->se_macaddr, ":"); 1110 kprintf(" %6D%c", se->se_bssid, ":", 1111 fail & MATCH_BSSID ? '!' : ' '); 1112 kprintf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 1113 fail & MATCH_CHANNEL ? '!' : ' '); 1114 kprintf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 1115 kprintf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1116 fail & MATCH_RATE ? '!' : ' '); 1117 kprintf(" %4s%c", 1118 (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1119 (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "", 1120 fail & MATCH_CAPINFO ? '!' : ' '); 1121 kprintf(" %3s%c ", 1122 (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1123 "wep" : "no", 1124 fail & MATCH_PRIVACY ? '!' : ' '); 1125 ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 1126 kprintf("%s\n", fail & (MATCH_SSID | MATCH_MESHID) ? "!" : ""); 1127 } 1128 #endif 1129 return fail; 1130 } 1131 1132 static void 1133 sta_update_notseen(struct sta_table *st) 1134 { 1135 struct sta_entry *se; 1136 1137 lockmgr(&st->st_lock, LK_EXCLUSIVE); 1138 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1139 /* 1140 * If seen the reset and don't bump the count; 1141 * otherwise bump the ``not seen'' count. Note 1142 * that this insures that stations for which we 1143 * see frames while not scanning but not during 1144 * this scan will not be penalized. 1145 */ 1146 if (se->se_seen) 1147 se->se_seen = 0; 1148 else 1149 se->se_notseen++; 1150 } 1151 lockmgr(&st->st_lock, LK_RELEASE); 1152 } 1153 1154 static void 1155 sta_dec_fails(struct sta_table *st) 1156 { 1157 struct sta_entry *se; 1158 1159 lockmgr(&st->st_lock, LK_EXCLUSIVE); 1160 TAILQ_FOREACH(se, &st->st_entry, se_list) 1161 if (se->se_fails) 1162 se->se_fails--; 1163 lockmgr(&st->st_lock, LK_RELEASE); 1164 } 1165 1166 static struct sta_entry * 1167 select_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 1168 { 1169 struct sta_table *st = ss->ss_priv; 1170 struct sta_entry *se, *selbs = NULL; 1171 1172 IEEE80211_DPRINTF(vap, debug, " %s\n", 1173 "macaddr bssid chan rssi rate flag wep essid"); 1174 lockmgr(&st->st_lock, LK_EXCLUSIVE); 1175 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1176 ieee80211_ies_expand(&se->base.se_ies); 1177 if (match_bss(vap, ss, se, debug) == 0) { 1178 if (selbs == NULL) 1179 selbs = se; 1180 else if (sta_compare(se, selbs) > 0) 1181 selbs = se; 1182 } 1183 } 1184 lockmgr(&st->st_lock, LK_RELEASE); 1185 1186 return selbs; 1187 } 1188 1189 /* 1190 * Pick an ap or ibss network to join or find a channel 1191 * to use to start an ibss network. 1192 */ 1193 static int 1194 sta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1195 { 1196 struct sta_table *st = ss->ss_priv; 1197 struct sta_entry *selbs; 1198 struct ieee80211_channel *chan; 1199 1200 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1201 ("wrong mode %u", vap->iv_opmode)); 1202 1203 if (st->st_newscan) { 1204 sta_update_notseen(st); 1205 st->st_newscan = 0; 1206 } 1207 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1208 /* 1209 * Manual/background scan, don't select+join the 1210 * bss, just return. The scanning framework will 1211 * handle notification that this has completed. 1212 */ 1213 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1214 return 1; 1215 } 1216 /* 1217 * Automatic sequencing; look for a candidate and 1218 * if found join the network. 1219 */ 1220 /* NB: unlocked read should be ok */ 1221 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1222 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1223 "%s: no scan candidate\n", __func__); 1224 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1225 return 0; 1226 notfound: 1227 /* 1228 * If nothing suitable was found decrement 1229 * the failure counts so entries will be 1230 * reconsidered the next time around. We 1231 * really want to do this only for sta's 1232 * where we've previously had some success. 1233 */ 1234 sta_dec_fails(st); 1235 st->st_newscan = 1; 1236 return 0; /* restart scan */ 1237 } 1238 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1239 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1240 return (selbs != NULL); 1241 if (selbs == NULL) 1242 goto notfound; 1243 chan = selbs->base.se_chan; 1244 if (selbs->se_flags & STA_DEMOTE11B) 1245 chan = demote11b(vap, chan); 1246 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1247 goto notfound; 1248 return 1; /* terminate scan */ 1249 } 1250 1251 /* 1252 * Lookup an entry in the scan cache. We assume we're 1253 * called from the bottom half or such that we don't need 1254 * to block the bottom half so that it's safe to return 1255 * a reference to an entry w/o holding the lock on the table. 1256 */ 1257 static struct sta_entry * 1258 sta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1259 { 1260 struct sta_entry *se; 1261 int hash = STA_HASH(macaddr); 1262 1263 lockmgr(&st->st_lock, LK_EXCLUSIVE); 1264 LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1265 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1266 break; 1267 lockmgr(&st->st_lock, LK_RELEASE); 1268 1269 return se; /* NB: unlocked */ 1270 } 1271 1272 static void 1273 sta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1274 { 1275 struct ieee80211com *ic = vap->iv_ic; 1276 struct ieee80211_node *ni = vap->iv_bss; 1277 struct sta_table *st = ss->ss_priv; 1278 enum ieee80211_phymode mode; 1279 struct sta_entry *se, *selbs; 1280 uint8_t roamRate, curRate, ucastRate; 1281 int8_t roamRssi, curRssi; 1282 1283 se = sta_lookup(st, ni->ni_macaddr); 1284 if (se == NULL) { 1285 /* XXX something is wrong */ 1286 return; 1287 } 1288 1289 mode = ieee80211_chan2mode(ic->ic_bsschan); 1290 roamRate = vap->iv_roamparms[mode].rate; 1291 roamRssi = vap->iv_roamparms[mode].rssi; 1292 ucastRate = vap->iv_txparms[mode].ucastrate; 1293 /* NB: the most up to date rssi is in the node, not the scan cache */ 1294 curRssi = ic->ic_node_getrssi(ni); 1295 if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1296 curRate = ni->ni_txrate; 1297 roamRate &= IEEE80211_RATE_VAL; 1298 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1299 "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1300 __func__, curRssi, curRate, roamRssi, roamRate); 1301 } else { 1302 curRate = roamRate; /* NB: insure compare below fails */ 1303 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1304 "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1305 } 1306 /* 1307 * Check if a new ap should be used and switch. 1308 * XXX deauth current ap 1309 */ 1310 if (curRate < roamRate || curRssi < roamRssi) { 1311 if (time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1312 /* 1313 * Scan cache contents are too old; force a scan now 1314 * if possible so we have current state to make a 1315 * decision with. We don't kick off a bg scan if 1316 * we're using dynamic turbo and boosted or if the 1317 * channel is busy. 1318 * XXX force immediate switch on scan complete 1319 */ 1320 if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1321 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)) 1322 ieee80211_bg_scan(vap, 0); 1323 return; 1324 } 1325 se->base.se_rssi = curRssi; 1326 selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1327 if (selbs != NULL && selbs != se) { 1328 struct ieee80211_channel *chan; 1329 1330 IEEE80211_DPRINTF(vap, 1331 IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1332 "%s: ROAM: curRate %u, roamRate %u, " 1333 "curRssi %d, roamRssi %d\n", __func__, 1334 curRate, roamRate, curRssi, roamRssi); 1335 1336 chan = selbs->base.se_chan; 1337 if (selbs->se_flags & STA_DEMOTE11B) 1338 chan = demote11b(vap, chan); 1339 (void) ieee80211_sta_join(vap, chan, &selbs->base); 1340 } 1341 } 1342 } 1343 1344 /* 1345 * Age entries in the scan cache. 1346 * XXX also do roaming since it's convenient 1347 */ 1348 static void 1349 sta_age(struct ieee80211_scan_state *ss) 1350 { 1351 struct ieee80211vap *vap = ss->ss_vap; 1352 1353 adhoc_age(ss); 1354 /* 1355 * If rate control is enabled check periodically to see if 1356 * we should roam from our current connection to one that 1357 * might be better. This only applies when we're operating 1358 * in sta mode and automatic roaming is set. 1359 * XXX defer if busy 1360 * XXX repeater station 1361 * XXX do when !bgscan? 1362 */ 1363 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1364 ("wrong mode %u", vap->iv_opmode)); 1365 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1366 (vap->iv_ic->ic_flags & IEEE80211_F_BGSCAN) && 1367 vap->iv_state >= IEEE80211_S_RUN) 1368 /* XXX vap is implicit */ 1369 sta_roam_check(ss, vap); 1370 } 1371 1372 /* 1373 * Iterate over the entries in the scan cache, invoking 1374 * the callback function on each one. 1375 */ 1376 static void 1377 sta_iterate(struct ieee80211_scan_state *ss, 1378 ieee80211_scan_iter_func *f, void *arg) 1379 { 1380 struct sta_table *st = ss->ss_priv; 1381 struct sta_entry *se; 1382 u_int gen; 1383 1384 lockmgr(&st->st_scanlock, LK_EXCLUSIVE); 1385 gen = st->st_scaniter++; 1386 restart: 1387 lockmgr(&st->st_lock, LK_EXCLUSIVE); 1388 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1389 if (se->se_scangen != gen) { 1390 se->se_scangen = gen; 1391 /* update public state */ 1392 se->base.se_age = ticks - se->se_lastupdate; 1393 lockmgr(&st->st_lock, LK_RELEASE); 1394 (*f)(arg, &se->base); 1395 goto restart; 1396 } 1397 } 1398 lockmgr(&st->st_lock, LK_RELEASE); 1399 1400 lockmgr(&st->st_scanlock, LK_RELEASE); 1401 } 1402 1403 static void 1404 sta_assoc_fail(struct ieee80211_scan_state *ss, 1405 const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1406 { 1407 struct sta_table *st = ss->ss_priv; 1408 struct sta_entry *se; 1409 1410 se = sta_lookup(st, macaddr); 1411 if (se != NULL) { 1412 se->se_fails++; 1413 se->se_lastfail = ticks; 1414 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1415 macaddr, "%s: reason %u fails %u", 1416 __func__, reason, se->se_fails); 1417 } 1418 } 1419 1420 static void 1421 sta_assoc_success(struct ieee80211_scan_state *ss, 1422 const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1423 { 1424 struct sta_table *st = ss->ss_priv; 1425 struct sta_entry *se; 1426 1427 se = sta_lookup(st, macaddr); 1428 if (se != NULL) { 1429 #if 0 1430 se->se_fails = 0; 1431 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1432 macaddr, "%s: fails %u", 1433 __func__, se->se_fails); 1434 #endif 1435 se->se_lastassoc = ticks; 1436 } 1437 } 1438 1439 static const struct ieee80211_scanner sta_default = { 1440 .scan_name = "default", 1441 .scan_attach = sta_attach, 1442 .scan_detach = sta_detach, 1443 .scan_start = sta_start, 1444 .scan_restart = sta_restart, 1445 .scan_cancel = sta_cancel, 1446 .scan_end = sta_pick_bss, 1447 .scan_flush = sta_flush, 1448 .scan_add = sta_add, 1449 .scan_age = sta_age, 1450 .scan_iterate = sta_iterate, 1451 .scan_assoc_fail = sta_assoc_fail, 1452 .scan_assoc_success = sta_assoc_success, 1453 }; 1454 IEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1455 1456 /* 1457 * Adhoc mode-specific support. 1458 */ 1459 1460 static const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1461 { 5180, 5200, 5220, 5240 }; 1462 static const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1463 { 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1464 static const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1465 { 5170, 5190, 5210, 5230 }; 1466 static const uint16_t adhoc11b[] = /* 10, 11 */ 1467 { 2457, 2462 }; 1468 1469 static const struct scanlist adhocScanTable[] = { 1470 { IEEE80211_MODE_11B, X(adhoc11b) }, 1471 { IEEE80211_MODE_11A, X(adhocWorld) }, 1472 { IEEE80211_MODE_11A, X(adhocFcc3) }, 1473 { IEEE80211_MODE_11B, X(adhocMkk) }, 1474 { .list = NULL } 1475 }; 1476 #undef X 1477 1478 /* 1479 * Start an adhoc-mode scan by populating the channel list. 1480 */ 1481 static int 1482 adhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1483 { 1484 struct sta_table *st = ss->ss_priv; 1485 1486 makescanlist(ss, vap, adhocScanTable); 1487 1488 if (ss->ss_mindwell == 0) 1489 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1490 if (ss->ss_maxdwell == 0) 1491 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1492 1493 st->st_scangen++; 1494 st->st_newscan = 1; 1495 1496 return 0; 1497 } 1498 1499 /* 1500 * Select a channel to start an adhoc network on. 1501 * The channel list was populated with appropriate 1502 * channels so select one that looks least occupied. 1503 */ 1504 static struct ieee80211_channel * 1505 adhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1506 { 1507 struct sta_table *st = ss->ss_priv; 1508 struct sta_entry *se; 1509 struct ieee80211_channel *c, *bestchan; 1510 int i, bestrssi, maxrssi; 1511 1512 bestchan = NULL; 1513 bestrssi = -1; 1514 1515 lockmgr(&st->st_lock, LK_EXCLUSIVE); 1516 for (i = 0; i < ss->ss_last; i++) { 1517 c = ss->ss_chans[i]; 1518 /* never consider a channel with radar */ 1519 if (IEEE80211_IS_CHAN_RADAR(c)) 1520 continue; 1521 /* skip channels disallowed by regulatory settings */ 1522 if (IEEE80211_IS_CHAN_NOADHOC(c)) 1523 continue; 1524 /* check channel attributes for band compatibility */ 1525 if (flags != 0 && (c->ic_flags & flags) != flags) 1526 continue; 1527 maxrssi = 0; 1528 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1529 if (se->base.se_chan != c) 1530 continue; 1531 if (se->base.se_rssi > maxrssi) 1532 maxrssi = se->base.se_rssi; 1533 } 1534 if (bestchan == NULL || maxrssi < bestrssi) 1535 bestchan = c; 1536 } 1537 lockmgr(&st->st_lock, LK_RELEASE); 1538 1539 return bestchan; 1540 } 1541 1542 /* 1543 * Pick an ibss network to join or find a channel 1544 * to use to start an ibss network. 1545 */ 1546 static int 1547 adhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1548 { 1549 struct sta_table *st = ss->ss_priv; 1550 struct sta_entry *selbs; 1551 struct ieee80211_channel *chan; 1552 1553 KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1554 vap->iv_opmode == IEEE80211_M_AHDEMO || 1555 vap->iv_opmode == IEEE80211_M_MBSS, 1556 ("wrong opmode %u", vap->iv_opmode)); 1557 1558 if (st->st_newscan) { 1559 sta_update_notseen(st); 1560 st->st_newscan = 0; 1561 } 1562 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1563 /* 1564 * Manual/background scan, don't select+join the 1565 * bss, just return. The scanning framework will 1566 * handle notification that this has completed. 1567 */ 1568 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1569 return 1; 1570 } 1571 /* 1572 * Automatic sequencing; look for a candidate and 1573 * if found join the network. 1574 */ 1575 /* NB: unlocked read should be ok */ 1576 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1577 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1578 "%s: no scan candidate\n", __func__); 1579 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1580 return 0; 1581 notfound: 1582 /* NB: never auto-start a tdma network for slot !0 */ 1583 #ifdef IEEE80211_SUPPORT_TDMA 1584 if (vap->iv_des_nssid && 1585 ((vap->iv_caps & IEEE80211_C_TDMA) == 0 || 1586 ieee80211_tdma_getslot(vap) == 0)) { 1587 #else 1588 if (vap->iv_des_nssid) { 1589 #endif 1590 /* 1591 * No existing adhoc network to join and we have 1592 * an ssid; start one up. If no channel was 1593 * specified, try to select a channel. 1594 */ 1595 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1596 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1597 struct ieee80211com *ic = vap->iv_ic; 1598 1599 chan = adhoc_pick_channel(ss, 0); 1600 if (chan != NULL) 1601 chan = ieee80211_ht_adjust_channel(ic, 1602 chan, vap->iv_flags_ht); 1603 } else 1604 chan = vap->iv_des_chan; 1605 if (chan != NULL) { 1606 ieee80211_create_ibss(vap, chan); 1607 return 1; 1608 } 1609 } 1610 /* 1611 * If nothing suitable was found decrement 1612 * the failure counts so entries will be 1613 * reconsidered the next time around. We 1614 * really want to do this only for sta's 1615 * where we've previously had some success. 1616 */ 1617 sta_dec_fails(st); 1618 st->st_newscan = 1; 1619 return 0; /* restart scan */ 1620 } 1621 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1622 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1623 return (selbs != NULL); 1624 if (selbs == NULL) 1625 goto notfound; 1626 chan = selbs->base.se_chan; 1627 if (selbs->se_flags & STA_DEMOTE11B) 1628 chan = demote11b(vap, chan); 1629 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1630 goto notfound; 1631 return 1; /* terminate scan */ 1632 } 1633 1634 /* 1635 * Age entries in the scan cache. 1636 */ 1637 static void 1638 adhoc_age(struct ieee80211_scan_state *ss) 1639 { 1640 struct sta_table *st = ss->ss_priv; 1641 struct sta_entry *se, *next; 1642 1643 lockmgr(&st->st_lock, LK_EXCLUSIVE); 1644 TAILQ_FOREACH_MUTABLE(se, &st->st_entry, se_list, next) { 1645 if (se->se_notseen > STA_PURGE_SCANS) { 1646 TAILQ_REMOVE(&st->st_entry, se, se_list); 1647 LIST_REMOVE(se, se_hash); 1648 ieee80211_ies_cleanup(&se->base.se_ies); 1649 kfree(se, M_80211_SCAN); 1650 } 1651 } 1652 lockmgr(&st->st_lock, LK_RELEASE); 1653 } 1654 1655 static const struct ieee80211_scanner adhoc_default = { 1656 .scan_name = "default", 1657 .scan_attach = sta_attach, 1658 .scan_detach = sta_detach, 1659 .scan_start = adhoc_start, 1660 .scan_restart = sta_restart, 1661 .scan_cancel = sta_cancel, 1662 .scan_end = adhoc_pick_bss, 1663 .scan_flush = sta_flush, 1664 .scan_pickchan = adhoc_pick_channel, 1665 .scan_add = sta_add, 1666 .scan_age = adhoc_age, 1667 .scan_iterate = sta_iterate, 1668 .scan_assoc_fail = sta_assoc_fail, 1669 .scan_assoc_success = sta_assoc_success, 1670 }; 1671 IEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1672 IEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1673 1674 static void 1675 ap_force_promisc(struct ieee80211com *ic) 1676 { 1677 struct ifnet *ifp = ic->ic_ifp; 1678 1679 /* set interface into promiscuous mode */ 1680 ifp->if_flags |= IFF_PROMISC; 1681 ieee80211_runtask(ic, &ic->ic_promisc_task); 1682 } 1683 1684 static void 1685 ap_reset_promisc(struct ieee80211com *ic) 1686 { 1687 ieee80211_syncifflag_locked(ic, IFF_PROMISC); 1688 } 1689 1690 static int 1691 ap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1692 { 1693 struct sta_table *st = ss->ss_priv; 1694 1695 makescanlist(ss, vap, staScanTable); 1696 1697 if (ss->ss_mindwell == 0) 1698 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1699 if (ss->ss_maxdwell == 0) 1700 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1701 1702 st->st_scangen++; 1703 st->st_newscan = 1; 1704 1705 ap_force_promisc(vap->iv_ic); 1706 return 0; 1707 } 1708 1709 /* 1710 * Cancel an ongoing scan. 1711 */ 1712 static int 1713 ap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1714 { 1715 ap_reset_promisc(vap->iv_ic); 1716 return 0; 1717 } 1718 1719 /* 1720 * Pick a quiet channel to use for ap operation. 1721 */ 1722 static struct ieee80211_channel * 1723 ap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1724 { 1725 struct sta_table *st = ss->ss_priv; 1726 struct ieee80211_channel *bestchan = NULL; 1727 int i; 1728 1729 /* XXX select channel more intelligently, e.g. channel spread, power */ 1730 /* NB: use scan list order to preserve channel preference */ 1731 for (i = 0; i < ss->ss_last; i++) { 1732 struct ieee80211_channel *chan = ss->ss_chans[i]; 1733 /* 1734 * If the channel is unoccupied the max rssi 1735 * should be zero; just take it. Otherwise 1736 * track the channel with the lowest rssi and 1737 * use that when all channels appear occupied. 1738 */ 1739 if (IEEE80211_IS_CHAN_RADAR(chan)) 1740 continue; 1741 if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1742 continue; 1743 /* check channel attributes for band compatibility */ 1744 if (flags != 0 && (chan->ic_flags & flags) != flags) 1745 continue; 1746 KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size")); 1747 /* XXX channel have interference */ 1748 if (st->st_maxrssi[chan->ic_ieee] == 0) { 1749 /* XXX use other considerations */ 1750 return chan; 1751 } 1752 if (bestchan == NULL || 1753 st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1754 bestchan = chan; 1755 } 1756 return bestchan; 1757 } 1758 1759 /* 1760 * Pick a quiet channel to use for ap operation. 1761 */ 1762 static int 1763 ap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1764 { 1765 struct ieee80211com *ic = vap->iv_ic; 1766 struct ieee80211_channel *bestchan; 1767 1768 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1769 ("wrong opmode %u", vap->iv_opmode)); 1770 bestchan = ap_pick_channel(ss, 0); 1771 if (bestchan == NULL) { 1772 /* no suitable channel, should not happen */ 1773 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1774 "%s: no suitable channel! (should not happen)\n", __func__); 1775 /* XXX print something? */ 1776 return 0; /* restart scan */ 1777 } 1778 /* 1779 * If this is a dynamic turbo channel, start with the unboosted one. 1780 */ 1781 if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1782 bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1783 bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1784 if (bestchan == NULL) { 1785 /* should never happen ?? */ 1786 return 0; 1787 } 1788 } 1789 ap_reset_promisc(ic); 1790 if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1791 /* 1792 * Manual/background scan, don't select+join the 1793 * bss, just return. The scanning framework will 1794 * handle notification that this has completed. 1795 */ 1796 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1797 return 1; 1798 } 1799 ieee80211_create_ibss(vap, 1800 ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ht)); 1801 return 1; 1802 } 1803 1804 static const struct ieee80211_scanner ap_default = { 1805 .scan_name = "default", 1806 .scan_attach = sta_attach, 1807 .scan_detach = sta_detach, 1808 .scan_start = ap_start, 1809 .scan_restart = sta_restart, 1810 .scan_cancel = ap_cancel, 1811 .scan_end = ap_end, 1812 .scan_flush = sta_flush, 1813 .scan_pickchan = ap_pick_channel, 1814 .scan_add = sta_add, 1815 .scan_age = adhoc_age, 1816 .scan_iterate = sta_iterate, 1817 .scan_assoc_success = sta_assoc_success, 1818 .scan_assoc_fail = sta_assoc_fail, 1819 }; 1820 IEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1821 1822 #ifdef IEEE80211_SUPPORT_MESH 1823 /* 1824 * Pick an mbss network to join or find a channel 1825 * to use to start an mbss network. 1826 */ 1827 static int 1828 mesh_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1829 { 1830 struct sta_table *st = ss->ss_priv; 1831 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1832 struct sta_entry *selbs; 1833 struct ieee80211_channel *chan; 1834 1835 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1836 ("wrong opmode %u", vap->iv_opmode)); 1837 1838 if (st->st_newscan) { 1839 sta_update_notseen(st); 1840 st->st_newscan = 0; 1841 } 1842 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1843 /* 1844 * Manual/background scan, don't select+join the 1845 * bss, just return. The scanning framework will 1846 * handle notification that this has completed. 1847 */ 1848 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1849 return 1; 1850 } 1851 /* 1852 * Automatic sequencing; look for a candidate and 1853 * if found join the network. 1854 */ 1855 /* NB: unlocked read should be ok */ 1856 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1857 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1858 "%s: no scan candidate\n", __func__); 1859 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1860 return 0; 1861 notfound: 1862 if (ms->ms_idlen != 0) { 1863 /* 1864 * No existing mbss network to join and we have 1865 * a meshid; start one up. If no channel was 1866 * specified, try to select a channel. 1867 */ 1868 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1869 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1870 struct ieee80211com *ic = vap->iv_ic; 1871 1872 chan = adhoc_pick_channel(ss, 0); 1873 if (chan != NULL) 1874 chan = ieee80211_ht_adjust_channel(ic, 1875 chan, vap->iv_flags_ht); 1876 } else 1877 chan = vap->iv_des_chan; 1878 if (chan != NULL) { 1879 ieee80211_create_ibss(vap, chan); 1880 return 1; 1881 } 1882 } 1883 /* 1884 * If nothing suitable was found decrement 1885 * the failure counts so entries will be 1886 * reconsidered the next time around. We 1887 * really want to do this only for sta's 1888 * where we've previously had some success. 1889 */ 1890 sta_dec_fails(st); 1891 st->st_newscan = 1; 1892 return 0; /* restart scan */ 1893 } 1894 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1895 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1896 return (selbs != NULL); 1897 if (selbs == NULL) 1898 goto notfound; 1899 chan = selbs->base.se_chan; 1900 if (selbs->se_flags & STA_DEMOTE11B) 1901 chan = demote11b(vap, chan); 1902 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1903 goto notfound; 1904 return 1; /* terminate scan */ 1905 } 1906 1907 static const struct ieee80211_scanner mesh_default = { 1908 .scan_name = "default", 1909 .scan_attach = sta_attach, 1910 .scan_detach = sta_detach, 1911 .scan_start = adhoc_start, 1912 .scan_restart = sta_restart, 1913 .scan_cancel = sta_cancel, 1914 .scan_end = mesh_pick_bss, 1915 .scan_flush = sta_flush, 1916 .scan_pickchan = adhoc_pick_channel, 1917 .scan_add = sta_add, 1918 .scan_age = adhoc_age, 1919 .scan_iterate = sta_iterate, 1920 .scan_assoc_fail = sta_assoc_fail, 1921 .scan_assoc_success = sta_assoc_success, 1922 }; 1923 IEEE80211_SCANNER_ALG(mesh, IEEE80211_M_MBSS, mesh_default); 1924 #endif /* IEEE80211_SUPPORT_MESH */ 1925