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sys/net80211/ieee80211_scan_sta.c
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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 59 #include <net/bpf.h> 60 61 /* 62 * Parameters for managing cache entries: 63 * 64 * o a station with STA_FAILS_MAX failures is not considered 65 * when picking a candidate 66 * o a station that hasn't had an update in STA_PURGE_SCANS 67 * (background) scans is discarded 68 * o after STA_FAILS_AGE seconds we clear the failure count 69 */ 70 #define STA_FAILS_MAX 2 /* assoc failures before ignored */ 71 #define STA_FAILS_AGE (2*60) /* time before clearing fails (secs) */ 72 #define STA_PURGE_SCANS 2 /* age for purging entries (scans) */ 73 74 /* XXX tunable */ 75 #define STA_RSSI_MIN 8 /* min acceptable rssi */ 76 #define STA_RSSI_MAX 40 /* max rssi for comparison */ 77 78 struct sta_entry { 79 struct ieee80211_scan_entry base; 80 TAILQ_ENTRY(sta_entry) se_list; 81 LIST_ENTRY(sta_entry) se_hash; 82 uint8_t se_fails; /* failure to associate count */ 83 uint8_t se_seen; /* seen during current scan */ 84 uint8_t se_notseen; /* not seen in previous scans */ 85 uint8_t se_flags; 86 #define STA_DEMOTE11B 0x01 /* match w/ demoted 11b chan */ 87 uint32_t se_avgrssi; /* LPF rssi state */ 88 unsigned long se_lastupdate; /* time of last update */ 89 unsigned long se_lastfail; /* time of last failure */ 90 unsigned long se_lastassoc; /* time of last association */ 91 u_int se_scangen; /* iterator scan gen# */ 92 u_int se_countrygen; /* gen# of last cc notify */ 93 }; 94 95 #define STA_HASHSIZE 32 96 /* simple hash is enough for variation of macaddr */ 97 #define STA_HASH(addr) \ 98 (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % STA_HASHSIZE) 99 100 #define MAX_IEEE_CHAN 256 /* max acceptable IEEE chan # */ 101 CTASSERT(MAX_IEEE_CHAN >= 256); 102 103 struct sta_table { 104 ieee80211_scan_table_lock_t st_lock; /* on scan table */ 105 TAILQ_HEAD(, sta_entry) st_entry; /* all entries */ 106 LIST_HEAD(, sta_entry) st_hash[STA_HASHSIZE]; 107 ieee80211_scan_iter_lock_t st_scanlock; /* on st_scaniter */ 108 u_int st_scaniter; /* gen# for iterator */ 109 u_int st_scangen; /* scan generation # */ 110 int st_newscan; 111 /* ap-related state */ 112 int st_maxrssi[MAX_IEEE_CHAN]; 113 }; 114 115 static void sta_flush_table(struct sta_table *); 116 /* 117 * match_bss returns a bitmask describing if an entry is suitable 118 * for use. If non-zero the entry was deemed not suitable and it's 119 * contents explains why. The following flags are or'd to this 120 * mask and can be used to figure out why the entry was rejected. 121 */ 122 #define MATCH_CHANNEL 0x00001 /* channel mismatch */ 123 #define MATCH_CAPINFO 0x00002 /* capabilities mismatch, e.g. no ess */ 124 #define MATCH_PRIVACY 0x00004 /* privacy mismatch */ 125 #define MATCH_RATE 0x00008 /* rate set mismatch */ 126 #define MATCH_SSID 0x00010 /* ssid mismatch */ 127 #define MATCH_BSSID 0x00020 /* bssid mismatch */ 128 #define MATCH_FAILS 0x00040 /* too many failed auth attempts */ 129 #define MATCH_NOTSEEN 0x00080 /* not seen in recent scans */ 130 #define MATCH_RSSI 0x00100 /* rssi deemed too low to use */ 131 #define MATCH_CC 0x00200 /* country code mismatch */ 132 #ifdef IEEE80211_SUPPORT_TDMA 133 #define MATCH_TDMA_NOIE 0x00400 /* no TDMA ie */ 134 #define MATCH_TDMA_NOTMASTER 0x00800 /* not TDMA master */ 135 #define MATCH_TDMA_NOSLOT 0x01000 /* all TDMA slots occupied */ 136 #define MATCH_TDMA_LOCAL 0x02000 /* local address */ 137 #define MATCH_TDMA_VERSION 0x04000 /* protocol version mismatch */ 138 #endif 139 #define MATCH_MESH_NOID 0x10000 /* no MESHID ie */ 140 #define MATCH_MESHID 0x20000 /* meshid mismatch */ 141 static int match_bss(struct ieee80211vap *, 142 const struct ieee80211_scan_state *, struct sta_entry *, int); 143 static void adhoc_age(struct ieee80211_scan_state *); 144 145 static __inline int 146 isocmp(const uint8_t cc1[], const uint8_t cc2[]) 147 { 148 return (cc1[0] == cc2[0] && cc1[1] == cc2[1]); 149 } 150 151 /* number of references from net80211 layer */ 152 static int nrefs = 0; 153 /* 154 * Module glue. 155 */ 156 IEEE80211_SCANNER_MODULE(sta, 1); 157 158 /* 159 * Attach prior to any scanning work. 160 */ 161 static int 162 sta_attach(struct ieee80211_scan_state *ss) 163 { 164 struct sta_table *st; 165 166 st = (struct sta_table *) IEEE80211_MALLOC(sizeof(struct sta_table), 167 M_80211_SCAN, 168 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 169 if (st == NULL) 170 return 0; 171 IEEE80211_SCAN_TABLE_LOCK_INIT(st, "scantable"); 172 IEEE80211_SCAN_ITER_LOCK_INIT(st, "scangen"); 173 TAILQ_INIT(&st->st_entry); 174 ss->ss_priv = st; 175 nrefs++; /* NB: we assume caller locking */ 176 return 1; 177 } 178 179 /* 180 * Cleanup any private state. 181 */ 182 static int 183 sta_detach(struct ieee80211_scan_state *ss) 184 { 185 struct sta_table *st = ss->ss_priv; 186 187 if (st != NULL) { 188 sta_flush_table(st); 189 IEEE80211_SCAN_TABLE_LOCK_DESTROY(st); 190 IEEE80211_SCAN_ITER_LOCK_DESTROY(st); 191 IEEE80211_FREE(st, M_80211_SCAN); 192 KASSERT(nrefs > 0, ("imbalanced attach/detach")); 193 nrefs--; /* NB: we assume caller locking */ 194 } 195 return 1; 196 } 197 198 /* 199 * Flush all per-scan state. 200 */ 201 static int 202 sta_flush(struct ieee80211_scan_state *ss) 203 { 204 struct sta_table *st = ss->ss_priv; 205 206 IEEE80211_SCAN_TABLE_LOCK(st); 207 sta_flush_table(st); 208 IEEE80211_SCAN_TABLE_UNLOCK(st); 209 ss->ss_last = 0; 210 return 0; 211 } 212 213 /* 214 * Flush all entries in the scan cache. 215 */ 216 static void 217 sta_flush_table(struct sta_table *st) 218 { 219 struct sta_entry *se, *next; 220 221 TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 222 TAILQ_REMOVE(&st->st_entry, se, se_list); 223 LIST_REMOVE(se, se_hash); 224 ieee80211_ies_cleanup(&se->base.se_ies); 225 IEEE80211_FREE(se, M_80211_SCAN); 226 } 227 memset(st->st_maxrssi, 0, sizeof(st->st_maxrssi)); 228 } 229 230 /* 231 * Process a beacon or probe response frame; create an 232 * entry in the scan cache or update any previous entry. 233 */ 234 static int 235 sta_add(struct ieee80211_scan_state *ss, 236 struct ieee80211_channel *curchan, 237 const struct ieee80211_scanparams *sp, 238 const struct ieee80211_frame *wh, 239 int subtype, int rssi, int noise) 240 { 241 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 242 #define PICK1ST(_ss) \ 243 ((ss->ss_flags & (IEEE80211_SCAN_PICK1ST | IEEE80211_SCAN_GOTPICK)) == \ 244 IEEE80211_SCAN_PICK1ST) 245 struct sta_table *st = ss->ss_priv; 246 const uint8_t *macaddr = wh->i_addr2; 247 struct ieee80211vap *vap = ss->ss_vap; 248 struct ieee80211com *ic = vap->iv_ic; 249 struct ieee80211_channel *c; 250 struct sta_entry *se; 251 struct ieee80211_scan_entry *ise; 252 int hash; 253 254 hash = STA_HASH(macaddr); 255 256 IEEE80211_SCAN_TABLE_LOCK(st); 257 LIST_FOREACH(se, &st->st_hash[hash], se_hash) 258 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 259 goto found; 260 se = (struct sta_entry *) IEEE80211_MALLOC(sizeof(struct sta_entry), 261 M_80211_SCAN, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 262 if (se == NULL) { 263 IEEE80211_SCAN_TABLE_UNLOCK(st); 264 return 0; 265 } 266 se->se_scangen = st->st_scaniter-1; 267 se->se_avgrssi = IEEE80211_RSSI_DUMMY_MARKER; 268 IEEE80211_ADDR_COPY(se->base.se_macaddr, macaddr); 269 TAILQ_INSERT_TAIL(&st->st_entry, se, se_list); 270 LIST_INSERT_HEAD(&st->st_hash[hash], se, se_hash); 271 found: 272 ise = &se->base; 273 /* XXX ap beaconing multiple ssid w/ same bssid */ 274 if (sp->ssid[1] != 0 && 275 (ISPROBE(subtype) || ise->se_ssid[1] == 0)) 276 memcpy(ise->se_ssid, sp->ssid, 2+sp->ssid[1]); 277 KASSERT(sp->rates[1] <= IEEE80211_RATE_MAXSIZE, 278 ("rate set too large: %u", sp->rates[1])); 279 memcpy(ise->se_rates, sp->rates, 2+sp->rates[1]); 280 if (sp->xrates != NULL) { 281 /* XXX validate xrates[1] */ 282 KASSERT(sp->xrates[1] <= IEEE80211_RATE_MAXSIZE, 283 ("xrate set too large: %u", sp->xrates[1])); 284 memcpy(ise->se_xrates, sp->xrates, 2+sp->xrates[1]); 285 } else 286 ise->se_xrates[1] = 0; 287 IEEE80211_ADDR_COPY(ise->se_bssid, wh->i_addr3); 288 if ((sp->status & IEEE80211_BPARSE_OFFCHAN) == 0) { 289 /* 290 * Record rssi data using extended precision LPF filter. 291 * 292 * NB: use only on-channel data to insure we get a good 293 * estimate of the signal we'll see when associated. 294 */ 295 IEEE80211_RSSI_LPF(se->se_avgrssi, rssi); 296 ise->se_rssi = IEEE80211_RSSI_GET(se->se_avgrssi); 297 ise->se_noise = noise; 298 } 299 memcpy(ise->se_tstamp.data, sp->tstamp, sizeof(ise->se_tstamp)); 300 ise->se_intval = sp->bintval; 301 ise->se_capinfo = sp->capinfo; 302 #ifdef IEEE80211_SUPPORT_MESH 303 if (sp->meshid != NULL && sp->meshid[1] != 0) 304 memcpy(ise->se_meshid, sp->meshid, 2+sp->meshid[1]); 305 #endif 306 /* 307 * Beware of overriding se_chan for frames seen 308 * off-channel; this can cause us to attempt an 309 * association on the wrong channel. 310 */ 311 if (sp->status & IEEE80211_BPARSE_OFFCHAN) { 312 /* 313 * Off-channel, locate the home/bss channel for the sta 314 * using the value broadcast in the DSPARMS ie. We know 315 * sp->chan has this value because it's used to calculate 316 * IEEE80211_BPARSE_OFFCHAN. 317 */ 318 c = ieee80211_find_channel_byieee(ic, sp->chan, 319 curchan->ic_flags); 320 if (c != NULL) { 321 ise->se_chan = c; 322 } else if (ise->se_chan == NULL) { 323 /* should not happen, pick something */ 324 ise->se_chan = curchan; 325 } 326 } else 327 ise->se_chan = curchan; 328 if (IEEE80211_IS_CHAN_HT(ise->se_chan) && sp->htcap == NULL) { 329 /* Demote legacy networks to a non-HT channel. */ 330 c = ieee80211_find_channel(ic, ise->se_chan->ic_freq, 331 ise->se_chan->ic_flags & ~IEEE80211_CHAN_HT); 332 KASSERT(c != NULL, 333 ("no legacy channel %u", ise->se_chan->ic_ieee)); 334 ise->se_chan = c; 335 } 336 ise->se_fhdwell = sp->fhdwell; 337 ise->se_fhindex = sp->fhindex; 338 ise->se_erp = sp->erp; 339 ise->se_timoff = sp->timoff; 340 if (sp->tim != NULL) { 341 const struct ieee80211_tim_ie *tim = 342 (const struct ieee80211_tim_ie *) sp->tim; 343 ise->se_dtimperiod = tim->tim_period; 344 } 345 if (sp->country != NULL) { 346 const struct ieee80211_country_ie *cie = 347 (const struct ieee80211_country_ie *) sp->country; 348 /* 349 * If 11d is enabled and we're attempting to join a bss 350 * that advertises it's country code then compare our 351 * current settings to what we fetched from the country ie. 352 * If our country code is unspecified or different then 353 * dispatch an event to user space that identifies the 354 * country code so our regdomain config can be changed. 355 */ 356 /* XXX only for STA mode? */ 357 if ((IEEE80211_IS_CHAN_11D(ise->se_chan) || 358 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 359 (ic->ic_regdomain.country == CTRY_DEFAULT || 360 !isocmp(cie->cc, ic->ic_regdomain.isocc))) { 361 /* only issue one notify event per scan */ 362 if (se->se_countrygen != st->st_scangen) { 363 ieee80211_notify_country(vap, ise->se_bssid, 364 cie->cc); 365 se->se_countrygen = st->st_scangen; 366 } 367 } 368 ise->se_cc[0] = cie->cc[0]; 369 ise->se_cc[1] = cie->cc[1]; 370 } 371 /* NB: no need to setup ie ptrs; they are not (currently) used */ 372 (void) ieee80211_ies_init(&ise->se_ies, sp->ies, sp->ies_len); 373 374 /* clear failure count after STA_FAIL_AGE passes */ 375 if (se->se_fails && (ticks - se->se_lastfail) > STA_FAILS_AGE*hz) { 376 se->se_fails = 0; 377 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, macaddr, 378 "%s: fails %u", __func__, se->se_fails); 379 } 380 381 se->se_lastupdate = ticks; /* update time */ 382 se->se_seen = 1; 383 se->se_notseen = 0; 384 385 KASSERT(sizeof(sp->bchan) == 1, ("bchan size")); 386 if (rssi > st->st_maxrssi[sp->bchan]) 387 st->st_maxrssi[sp->bchan] = rssi; 388 389 IEEE80211_SCAN_TABLE_UNLOCK(st); 390 391 /* 392 * If looking for a quick choice and nothing's 393 * been found check here. 394 */ 395 if (PICK1ST(ss) && match_bss(vap, ss, se, IEEE80211_MSG_SCAN) == 0) 396 ss->ss_flags |= IEEE80211_SCAN_GOTPICK; 397 398 return 1; 399 #undef PICK1ST 400 #undef ISPROBE 401 } 402 403 /* 404 * Check if a channel is excluded by user request. 405 */ 406 static int 407 isexcluded(struct ieee80211vap *vap, const struct ieee80211_channel *c) 408 { 409 return (isclr(vap->iv_ic->ic_chan_active, c->ic_ieee) || 410 (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 411 c->ic_freq != vap->iv_des_chan->ic_freq)); 412 } 413 414 static struct ieee80211_channel * 415 find11gchannel(struct ieee80211com *ic, int i, int freq) 416 { 417 struct ieee80211_channel *c; 418 int j; 419 420 /* 421 * The normal ordering in the channel list is b channel 422 * immediately followed by g so optimize the search for 423 * this. We'll still do a full search just in case. 424 */ 425 for (j = i+1; j < ic->ic_nchans; j++) { 426 c = &ic->ic_channels[j]; 427 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 428 return c; 429 } 430 for (j = 0; j < i; j++) { 431 c = &ic->ic_channels[j]; 432 if (c->ic_freq == freq && IEEE80211_IS_CHAN_G(c)) 433 return c; 434 } 435 return NULL; 436 } 437 438 static const u_int chanflags[IEEE80211_MODE_MAX] = { 439 [IEEE80211_MODE_AUTO] = IEEE80211_CHAN_B, 440 [IEEE80211_MODE_11A] = IEEE80211_CHAN_A, 441 [IEEE80211_MODE_11B] = IEEE80211_CHAN_B, 442 [IEEE80211_MODE_11G] = IEEE80211_CHAN_G, 443 [IEEE80211_MODE_FH] = IEEE80211_CHAN_FHSS, 444 /* check base channel */ 445 [IEEE80211_MODE_TURBO_A] = IEEE80211_CHAN_A, 446 [IEEE80211_MODE_TURBO_G] = IEEE80211_CHAN_G, 447 [IEEE80211_MODE_STURBO_A] = IEEE80211_CHAN_ST, 448 [IEEE80211_MODE_HALF] = IEEE80211_CHAN_HALF, 449 [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_QUARTER, 450 /* check legacy */ 451 [IEEE80211_MODE_11NA] = IEEE80211_CHAN_A, 452 [IEEE80211_MODE_11NG] = IEEE80211_CHAN_G, 453 }; 454 455 static void 456 add_channels(struct ieee80211vap *vap, 457 struct ieee80211_scan_state *ss, 458 enum ieee80211_phymode mode, const uint16_t freq[], int nfreq) 459 { 460 struct ieee80211com *ic = vap->iv_ic; 461 struct ieee80211_channel *c, *cg; 462 u_int modeflags; 463 int i; 464 465 KASSERT(mode < nitems(chanflags), ("Unexpected mode %u", mode)); 466 modeflags = chanflags[mode]; 467 for (i = 0; i < nfreq; i++) { 468 if (ss->ss_last >= IEEE80211_SCAN_MAX) 469 break; 470 471 c = ieee80211_find_channel(ic, freq[i], modeflags); 472 if (c == NULL || isexcluded(vap, c)) 473 continue; 474 if (mode == IEEE80211_MODE_AUTO) { 475 KASSERT(IEEE80211_IS_CHAN_B(c), 476 ("%s: wrong channel for 'auto' mode %u / %u\n", 477 __func__, c->ic_freq, c->ic_flags)); 478 479 /* 480 * XXX special-case 11b/g channels so we select 481 * the g channel if both are present. 482 */ 483 if ((cg = find11gchannel(ic, i, c->ic_freq)) != NULL) 484 c = cg; 485 } 486 ss->ss_chans[ss->ss_last++] = c; 487 } 488 } 489 490 struct scanlist { 491 uint16_t mode; 492 uint16_t count; 493 const uint16_t *list; 494 }; 495 496 static int 497 checktable(const struct scanlist *scan, const struct ieee80211_channel *c) 498 { 499 int i; 500 501 for (; scan->list != NULL; scan++) { 502 for (i = 0; i < scan->count; i++) 503 if (scan->list[i] == c->ic_freq) 504 return 1; 505 } 506 return 0; 507 } 508 509 static int 510 onscanlist(const struct ieee80211_scan_state *ss, 511 const struct ieee80211_channel *c) 512 { 513 int i; 514 515 for (i = 0; i < ss->ss_last; i++) 516 if (ss->ss_chans[i] == c) 517 return 1; 518 return 0; 519 } 520 521 static void 522 sweepchannels(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 523 const struct scanlist table[]) 524 { 525 struct ieee80211com *ic = vap->iv_ic; 526 struct ieee80211_channel *c; 527 int i; 528 529 for (i = 0; i < ic->ic_nchans; i++) { 530 if (ss->ss_last >= IEEE80211_SCAN_MAX) 531 break; 532 533 c = &ic->ic_channels[i]; 534 /* 535 * Ignore dynamic turbo channels; we scan them 536 * in normal mode (i.e. not boosted). Likewise 537 * for HT channels, they get scanned using 538 * legacy rates. 539 */ 540 if (IEEE80211_IS_CHAN_DTURBO(c) || IEEE80211_IS_CHAN_HT(c)) 541 continue; 542 543 /* 544 * If a desired mode was specified, scan only 545 * channels that satisfy that constraint. 546 */ 547 if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 548 vap->iv_des_mode != ieee80211_chan2mode(c)) 549 continue; 550 551 /* 552 * Skip channels excluded by user request. 553 */ 554 if (isexcluded(vap, c)) 555 continue; 556 557 /* 558 * Add the channel unless it is listed in the 559 * fixed scan order tables. This insures we 560 * don't sweep back in channels we filtered out 561 * above. 562 */ 563 if (checktable(table, c)) 564 continue; 565 566 /* Add channel to scanning list. */ 567 ss->ss_chans[ss->ss_last++] = c; 568 } 569 /* 570 * Explicitly add any desired channel if: 571 * - not already on the scan list 572 * - allowed by any desired mode constraint 573 * - there is space in the scan list 574 * This allows the channel to be used when the filtering 575 * mechanisms would otherwise elide it (e.g HT, turbo). 576 */ 577 c = vap->iv_des_chan; 578 if (c != IEEE80211_CHAN_ANYC && 579 !onscanlist(ss, c) && 580 (vap->iv_des_mode == IEEE80211_MODE_AUTO || 581 vap->iv_des_mode == ieee80211_chan2mode(c)) && 582 ss->ss_last < IEEE80211_SCAN_MAX) 583 ss->ss_chans[ss->ss_last++] = c; 584 } 585 586 static void 587 makescanlist(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, 588 const struct scanlist table[]) 589 { 590 const struct scanlist *scan; 591 enum ieee80211_phymode mode; 592 593 ss->ss_last = 0; 594 /* 595 * Use the table of ordered channels to construct the list 596 * of channels for scanning. Any channels in the ordered 597 * list not in the master list will be discarded. 598 */ 599 for (scan = table; scan->list != NULL; scan++) { 600 mode = scan->mode; 601 602 switch (mode) { 603 case IEEE80211_MODE_11B: 604 if (vap->iv_des_mode == IEEE80211_MODE_11B) 605 break; 606 607 /* 608 * The scan table marks 2.4Ghz channels as b 609 * so if the desired mode is 11g / 11ng, 610 * then use the 11b channel list but upgrade the mode. 611 * 612 * NB: 11b -> AUTO lets add_channels upgrade an 613 * 11b channel to 11g if available. 614 */ 615 if (vap->iv_des_mode == IEEE80211_MODE_AUTO || 616 vap->iv_des_mode == IEEE80211_MODE_11G || 617 vap->iv_des_mode == IEEE80211_MODE_11NG) { 618 mode = vap->iv_des_mode; 619 break; 620 } 621 622 continue; 623 case IEEE80211_MODE_11A: 624 /* Use 11a channel list for 11na mode */ 625 if (vap->iv_des_mode == IEEE80211_MODE_11NA) { 626 mode = vap->iv_des_mode; 627 break; 628 } 629 630 /* FALLTHROUGH */ 631 default: 632 /* 633 * If a desired mode was specified, scan only 634 * channels that satisfy that constraint. 635 */ 636 if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 637 vap->iv_des_mode != mode) 638 continue; 639 } 640 641 #ifdef IEEE80211_F_XR 642 /* XR does not operate on turbo channels */ 643 if ((vap->iv_flags & IEEE80211_F_XR) && 644 (mode == IEEE80211_MODE_TURBO_A || 645 mode == IEEE80211_MODE_TURBO_G || 646 mode == IEEE80211_MODE_STURBO_A)) 647 continue; 648 #endif 649 /* 650 * Add the list of the channels; any that are not 651 * in the master channel list will be discarded. 652 */ 653 add_channels(vap, ss, mode, scan->list, scan->count); 654 } 655 656 /* 657 * Add the channels from the ic that are not present 658 * in the table. 659 */ 660 sweepchannels(ss, vap, table); 661 } 662 663 static const uint16_t rcl1[] = /* 8 FCC channel: 52, 56, 60, 64, 36, 40, 44, 48 */ 664 { 5260, 5280, 5300, 5320, 5180, 5200, 5220, 5240 }; 665 static const uint16_t rcl2[] = /* 4 MKK channels: 34, 38, 42, 46 */ 666 { 5170, 5190, 5210, 5230 }; 667 static const uint16_t rcl3[] = /* 2.4Ghz ch: 1,6,11,7,13 */ 668 { 2412, 2437, 2462, 2442, 2472 }; 669 static const uint16_t rcl4[] = /* 5 FCC channel: 149, 153, 161, 165 */ 670 { 5745, 5765, 5785, 5805, 5825 }; 671 static const uint16_t rcl7[] = /* 11 ETSI channel: 100,104,108,112,116,120,124,128,132,136,140 */ 672 { 5500, 5520, 5540, 5560, 5580, 5600, 5620, 5640, 5660, 5680, 5700 }; 673 static const uint16_t rcl8[] = /* 2.4Ghz ch: 2,3,4,5,8,9,10,12 */ 674 { 2417, 2422, 2427, 2432, 2447, 2452, 2457, 2467 }; 675 static const uint16_t rcl9[] = /* 2.4Ghz ch: 14 */ 676 { 2484 }; 677 static const uint16_t rcl10[] = /* Added Korean channels 2312-2372 */ 678 { 2312, 2317, 2322, 2327, 2332, 2337, 2342, 2347, 2352, 2357, 2362, 2367, 2372 }; 679 static const uint16_t rcl11[] = /* Added Japan channels in 4.9/5.0 spectrum */ 680 { 5040, 5060, 5080, 4920, 4940, 4960, 4980 }; 681 #ifdef ATH_TURBO_SCAN 682 static const uint16_t rcl5[] = /* 3 static turbo channels */ 683 { 5210, 5250, 5290 }; 684 static const uint16_t rcl6[] = /* 2 static turbo channels */ 685 { 5760, 5800 }; 686 static const uint16_t rcl6x[] = /* 4 FCC3 turbo channels */ 687 { 5540, 5580, 5620, 5660 }; 688 static const uint16_t rcl12[] = /* 2.4Ghz Turbo channel 6 */ 689 { 2437 }; 690 static const uint16_t rcl13[] = /* dynamic Turbo channels */ 691 { 5200, 5240, 5280, 5765, 5805 }; 692 #endif /* ATH_TURBO_SCAN */ 693 694 #define X(a) .count = sizeof(a)/sizeof(a[0]), .list = a 695 696 static const struct scanlist staScanTable[] = { 697 { IEEE80211_MODE_11B, X(rcl3) }, 698 { IEEE80211_MODE_11A, X(rcl1) }, 699 { IEEE80211_MODE_11A, X(rcl2) }, 700 { IEEE80211_MODE_11B, X(rcl8) }, 701 { IEEE80211_MODE_11B, X(rcl9) }, 702 { IEEE80211_MODE_11A, X(rcl4) }, 703 #ifdef ATH_TURBO_SCAN 704 { IEEE80211_MODE_STURBO_A, X(rcl5) }, 705 { IEEE80211_MODE_STURBO_A, X(rcl6) }, 706 { IEEE80211_MODE_TURBO_A, X(rcl6x) }, 707 { IEEE80211_MODE_TURBO_A, X(rcl13) }, 708 #endif /* ATH_TURBO_SCAN */ 709 { IEEE80211_MODE_11A, X(rcl7) }, 710 { IEEE80211_MODE_11B, X(rcl10) }, 711 { IEEE80211_MODE_11A, X(rcl11) }, 712 #ifdef ATH_TURBO_SCAN 713 { IEEE80211_MODE_TURBO_G, X(rcl12) }, 714 #endif /* ATH_TURBO_SCAN */ 715 { .list = NULL } 716 }; 717 718 /* 719 * Start a station-mode scan by populating the channel list. 720 */ 721 static int 722 sta_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 723 { 724 struct sta_table *st = ss->ss_priv; 725 726 makescanlist(ss, vap, staScanTable); 727 728 if (ss->ss_mindwell == 0) 729 ss->ss_mindwell = msecs_to_ticks(20); /* 20ms */ 730 if (ss->ss_maxdwell == 0) 731 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 732 733 st->st_scangen++; 734 st->st_newscan = 1; 735 736 return 0; 737 } 738 739 /* 740 * Restart a scan, typically a bg scan but can 741 * also be a fg scan that came up empty. 742 */ 743 static int 744 sta_restart(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 745 { 746 struct sta_table *st = ss->ss_priv; 747 748 st->st_newscan = 1; 749 return 0; 750 } 751 752 /* 753 * Cancel an ongoing scan. 754 */ 755 static int 756 sta_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 757 { 758 return 0; 759 } 760 761 /* 762 * Demote any supplied 11g channel to 11b. There should 763 * always be an 11b channel but we check anyway... 764 */ 765 static struct ieee80211_channel * 766 demote11b(struct ieee80211vap *vap, struct ieee80211_channel *chan) 767 { 768 struct ieee80211_channel *c; 769 770 if (IEEE80211_IS_CHAN_ANYG(chan) && 771 vap->iv_des_mode == IEEE80211_MODE_AUTO) { 772 c = ieee80211_find_channel(vap->iv_ic, chan->ic_freq, 773 (chan->ic_flags &~ (IEEE80211_CHAN_PUREG | IEEE80211_CHAN_G)) | 774 IEEE80211_CHAN_B); 775 if (c != NULL) 776 chan = c; 777 } 778 return chan; 779 } 780 781 static int 782 maxrate(const struct ieee80211_scan_entry *se) 783 { 784 const struct ieee80211_ie_htcap *htcap = 785 (const struct ieee80211_ie_htcap *) se->se_ies.htcap_ie; 786 int rmax, r, i, txstream; 787 uint16_t caps; 788 uint8_t txparams; 789 790 rmax = 0; 791 if (htcap != NULL) { 792 /* 793 * HT station; inspect supported MCS and then adjust 794 * rate by channel width. 795 */ 796 txparams = htcap->hc_mcsset[12]; 797 if (txparams & 0x3) { 798 /* 799 * TX MCS parameters defined and not equal to RX, 800 * extract the number of spartial streams and 801 * map it to the highest MCS rate. 802 */ 803 txstream = ((txparams & 0xc) >> 2) + 1; 804 i = txstream * 8 - 1; 805 } else 806 for (i = 31; i >= 0 && isclr(htcap->hc_mcsset, i); i--); 807 if (i >= 0) { 808 caps = le16dec(&htcap->hc_cap); 809 if ((caps & IEEE80211_HTCAP_CHWIDTH40) && 810 (caps & IEEE80211_HTCAP_SHORTGI40)) 811 rmax = ieee80211_htrates[i].ht40_rate_400ns; 812 else if (caps & IEEE80211_HTCAP_CHWIDTH40) 813 rmax = ieee80211_htrates[i].ht40_rate_800ns; 814 else if (caps & IEEE80211_HTCAP_SHORTGI20) 815 rmax = ieee80211_htrates[i].ht20_rate_400ns; 816 else 817 rmax = ieee80211_htrates[i].ht20_rate_800ns; 818 } 819 } 820 for (i = 0; i < se->se_rates[1]; i++) { 821 r = se->se_rates[2+i] & IEEE80211_RATE_VAL; 822 if (r > rmax) 823 rmax = r; 824 } 825 for (i = 0; i < se->se_xrates[1]; i++) { 826 r = se->se_xrates[2+i] & IEEE80211_RATE_VAL; 827 if (r > rmax) 828 rmax = r; 829 } 830 return rmax; 831 } 832 833 /* 834 * Compare the capabilities of two entries and decide which is 835 * more desirable (return >0 if a is considered better). Note 836 * that we assume compatibility/usability has already been checked 837 * so we don't need to (e.g. validate whether privacy is supported). 838 * Used to select the best scan candidate for association in a BSS. 839 */ 840 static int 841 sta_compare(const struct sta_entry *a, const struct sta_entry *b) 842 { 843 #define PREFER(_a,_b,_what) do { \ 844 if (((_a) ^ (_b)) & (_what)) \ 845 return ((_a) & (_what)) ? 1 : -1; \ 846 } while (0) 847 int maxa, maxb; 848 int8_t rssia, rssib; 849 int weight; 850 851 /* privacy support */ 852 PREFER(a->base.se_capinfo, b->base.se_capinfo, 853 IEEE80211_CAPINFO_PRIVACY); 854 855 /* compare count of previous failures */ 856 weight = b->se_fails - a->se_fails; 857 if (abs(weight) > 1) 858 return weight; 859 860 /* 861 * Compare rssi. If the two are considered equivalent 862 * then fallback to other criteria. We threshold the 863 * comparisons to avoid selecting an ap purely by rssi 864 * when both values may be good but one ap is otherwise 865 * more desirable (e.g. an 11b-only ap with stronger 866 * signal than an 11g ap). 867 */ 868 rssia = MIN(a->base.se_rssi, STA_RSSI_MAX); 869 rssib = MIN(b->base.se_rssi, STA_RSSI_MAX); 870 if (abs(rssib - rssia) < 5) { 871 /* best/max rate preferred if signal level close enough XXX */ 872 maxa = maxrate(&a->base); 873 maxb = maxrate(&b->base); 874 if (maxa != maxb) 875 return maxa - maxb; 876 /* XXX use freq for channel preference */ 877 /* for now just prefer 5Ghz band to all other bands */ 878 PREFER(IEEE80211_IS_CHAN_5GHZ(a->base.se_chan), 879 IEEE80211_IS_CHAN_5GHZ(b->base.se_chan), 1); 880 } 881 /* all things being equal, use signal level */ 882 return a->base.se_rssi - b->base.se_rssi; 883 #undef PREFER 884 } 885 886 /* 887 * Check rate set suitability and return the best supported rate. 888 * XXX inspect MCS for HT 889 */ 890 static int 891 check_rate(struct ieee80211vap *vap, const struct ieee80211_channel *chan, 892 const struct ieee80211_scan_entry *se) 893 { 894 const struct ieee80211_rateset *srs; 895 int i, j, nrs, r, okrate, badrate, fixedrate, ucastrate; 896 const uint8_t *rs; 897 898 okrate = badrate = 0; 899 900 srs = ieee80211_get_suprates(vap->iv_ic, chan); 901 nrs = se->se_rates[1]; 902 rs = se->se_rates+2; 903 /* XXX MCS */ 904 ucastrate = vap->iv_txparms[ieee80211_chan2mode(chan)].ucastrate; 905 fixedrate = IEEE80211_FIXED_RATE_NONE; 906 again: 907 for (i = 0; i < nrs; i++) { 908 r = IEEE80211_RV(rs[i]); 909 badrate = r; 910 /* 911 * Check any fixed rate is included. 912 */ 913 if (r == ucastrate) 914 fixedrate = r; 915 /* 916 * Check against our supported rates. 917 */ 918 for (j = 0; j < srs->rs_nrates; j++) 919 if (r == IEEE80211_RV(srs->rs_rates[j])) { 920 if (r > okrate) /* NB: track max */ 921 okrate = r; 922 break; 923 } 924 925 if (j == srs->rs_nrates && (rs[i] & IEEE80211_RATE_BASIC)) { 926 /* 927 * Don't try joining a BSS, if we don't support 928 * one of its basic rates. 929 */ 930 okrate = 0; 931 goto back; 932 } 933 } 934 if (rs == se->se_rates+2) { 935 /* scan xrates too; sort of an algol68-style for loop */ 936 nrs = se->se_xrates[1]; 937 rs = se->se_xrates+2; 938 goto again; 939 } 940 941 back: 942 if (okrate == 0 || ucastrate != fixedrate) 943 return badrate | IEEE80211_RATE_BASIC; 944 else 945 return IEEE80211_RV(okrate); 946 } 947 948 static __inline int 949 match_id(const uint8_t *ie, const uint8_t *val, int len) 950 { 951 return (ie[1] == len && memcmp(ie+2, val, len) == 0); 952 } 953 954 static int 955 match_ssid(const uint8_t *ie, 956 int nssid, const struct ieee80211_scan_ssid ssids[]) 957 { 958 int i; 959 960 for (i = 0; i < nssid; i++) { 961 if (match_id(ie, ssids[i].ssid, ssids[i].len)) 962 return 1; 963 } 964 return 0; 965 } 966 967 #ifdef IEEE80211_SUPPORT_TDMA 968 static int 969 tdma_isfull(const struct ieee80211_tdma_param *tdma) 970 { 971 int slot, slotcnt; 972 973 slotcnt = tdma->tdma_slotcnt; 974 for (slot = slotcnt-1; slot >= 0; slot--) 975 if (isclr(tdma->tdma_inuse, slot)) 976 return 0; 977 return 1; 978 } 979 #endif /* IEEE80211_SUPPORT_TDMA */ 980 981 /* 982 * Test a scan candidate for suitability/compatibility. 983 */ 984 static int 985 match_bss(struct ieee80211vap *vap, 986 const struct ieee80211_scan_state *ss, struct sta_entry *se0, 987 int debug) 988 { 989 struct ieee80211com *ic = vap->iv_ic; 990 struct ieee80211_scan_entry *se = &se0->base; 991 uint8_t rate; 992 int fail; 993 994 fail = 0; 995 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, se->se_chan))) 996 fail |= MATCH_CHANNEL; 997 /* 998 * NB: normally the desired mode is used to construct 999 * the channel list, but it's possible for the scan 1000 * cache to include entries for stations outside this 1001 * list so we check the desired mode here to weed them 1002 * out. 1003 */ 1004 if (vap->iv_des_mode != IEEE80211_MODE_AUTO && 1005 (se->se_chan->ic_flags & IEEE80211_CHAN_ALLTURBO) != 1006 chanflags[vap->iv_des_mode]) 1007 fail |= MATCH_CHANNEL; 1008 if (vap->iv_opmode == IEEE80211_M_IBSS) { 1009 if ((se->se_capinfo & IEEE80211_CAPINFO_IBSS) == 0) 1010 fail |= MATCH_CAPINFO; 1011 #ifdef IEEE80211_SUPPORT_TDMA 1012 } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) { 1013 /* 1014 * Adhoc demo network setup shouldn't really be scanning 1015 * but just in case skip stations operating in IBSS or 1016 * BSS mode. 1017 */ 1018 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1019 fail |= MATCH_CAPINFO; 1020 /* 1021 * TDMA operation cannot coexist with a normal 802.11 network; 1022 * skip if IBSS or ESS capabilities are marked and require 1023 * the beacon have a TDMA ie present. 1024 */ 1025 if (vap->iv_caps & IEEE80211_C_TDMA) { 1026 const struct ieee80211_tdma_param *tdma = 1027 (const struct ieee80211_tdma_param *)se->se_ies.tdma_ie; 1028 const struct ieee80211_tdma_state *ts = vap->iv_tdma; 1029 1030 if (tdma == NULL) 1031 fail |= MATCH_TDMA_NOIE; 1032 else if (tdma->tdma_version != ts->tdma_version) 1033 fail |= MATCH_TDMA_VERSION; 1034 else if (tdma->tdma_slot != 0) 1035 fail |= MATCH_TDMA_NOTMASTER; 1036 else if (tdma_isfull(tdma)) 1037 fail |= MATCH_TDMA_NOSLOT; 1038 #if 0 1039 else if (ieee80211_local_address(se->se_macaddr)) 1040 fail |= MATCH_TDMA_LOCAL; 1041 #endif 1042 } 1043 #endif /* IEEE80211_SUPPORT_TDMA */ 1044 #ifdef IEEE80211_SUPPORT_MESH 1045 } else if (vap->iv_opmode == IEEE80211_M_MBSS) { 1046 const struct ieee80211_mesh_state *ms = vap->iv_mesh; 1047 /* 1048 * Mesh nodes have IBSS & ESS bits in capinfo turned off 1049 * and two special ie's that must be present. 1050 */ 1051 if (se->se_capinfo & (IEEE80211_CAPINFO_IBSS|IEEE80211_CAPINFO_ESS)) 1052 fail |= MATCH_CAPINFO; 1053 else if (se->se_meshid[0] != IEEE80211_ELEMID_MESHID) 1054 fail |= MATCH_MESH_NOID; 1055 else if (ms->ms_idlen != 0 && 1056 match_id(se->se_meshid, ms->ms_id, ms->ms_idlen)) 1057 fail |= MATCH_MESHID; 1058 #endif 1059 } else { 1060 if ((se->se_capinfo & IEEE80211_CAPINFO_ESS) == 0) 1061 fail |= MATCH_CAPINFO; 1062 /* 1063 * If 11d is enabled and we're attempting to join a bss 1064 * that advertises it's country code then compare our 1065 * current settings to what we fetched from the country ie. 1066 * If our country code is unspecified or different then do 1067 * not attempt to join the bss. We should have already 1068 * dispatched an event to user space that identifies the 1069 * new country code so our regdomain config should match. 1070 */ 1071 if ((IEEE80211_IS_CHAN_11D(se->se_chan) || 1072 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) && 1073 se->se_cc[0] != 0 && 1074 (ic->ic_regdomain.country == CTRY_DEFAULT || 1075 !isocmp(se->se_cc, ic->ic_regdomain.isocc))) 1076 fail |= MATCH_CC; 1077 } 1078 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1079 if ((se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) 1080 fail |= MATCH_PRIVACY; 1081 } else { 1082 /* XXX does this mean privacy is supported or required? */ 1083 if (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) 1084 fail |= MATCH_PRIVACY; 1085 } 1086 se0->se_flags &= ~STA_DEMOTE11B; 1087 rate = check_rate(vap, se->se_chan, se); 1088 if (rate & IEEE80211_RATE_BASIC) { 1089 fail |= MATCH_RATE; 1090 /* 1091 * An 11b-only ap will give a rate mismatch if there is an 1092 * OFDM fixed tx rate for 11g. Try downgrading the channel 1093 * in the scan list to 11b and retry the rate check. 1094 */ 1095 if (IEEE80211_IS_CHAN_ANYG(se->se_chan)) { 1096 rate = check_rate(vap, demote11b(vap, se->se_chan), se); 1097 if ((rate & IEEE80211_RATE_BASIC) == 0) { 1098 fail &= ~MATCH_RATE; 1099 se0->se_flags |= STA_DEMOTE11B; 1100 } 1101 } 1102 } else if (rate < 2*24) { 1103 /* 1104 * This is an 11b-only ap. Check the desired mode in 1105 * case that needs to be honored (mode 11g filters out 1106 * 11b-only ap's). Otherwise force any 11g channel used 1107 * in scanning to be demoted. 1108 * 1109 * NB: we cheat a bit here by looking at the max rate; 1110 * we could/should check the rates. 1111 */ 1112 if (!(vap->iv_des_mode == IEEE80211_MODE_AUTO || 1113 vap->iv_des_mode == IEEE80211_MODE_11B)) 1114 fail |= MATCH_RATE; 1115 else 1116 se0->se_flags |= STA_DEMOTE11B; 1117 } 1118 if (ss->ss_nssid != 0 && 1119 !match_ssid(se->se_ssid, ss->ss_nssid, ss->ss_ssid)) 1120 fail |= MATCH_SSID; 1121 if ((vap->iv_flags & IEEE80211_F_DESBSSID) && 1122 !IEEE80211_ADDR_EQ(vap->iv_des_bssid, se->se_bssid)) 1123 fail |= MATCH_BSSID; 1124 if (se0->se_fails >= STA_FAILS_MAX) 1125 fail |= MATCH_FAILS; 1126 if (se0->se_notseen >= STA_PURGE_SCANS) 1127 fail |= MATCH_NOTSEEN; 1128 if (se->se_rssi < STA_RSSI_MIN) 1129 fail |= MATCH_RSSI; 1130 #ifdef IEEE80211_DEBUG 1131 if (ieee80211_msg(vap, debug)) { 1132 printf(" %c %s", 1133 fail & MATCH_FAILS ? '=' : 1134 fail & MATCH_NOTSEEN ? '^' : 1135 fail & MATCH_CC ? '$' : 1136 #ifdef IEEE80211_SUPPORT_TDMA 1137 fail & MATCH_TDMA_NOIE ? '&' : 1138 fail & MATCH_TDMA_VERSION ? 'v' : 1139 fail & MATCH_TDMA_NOTMASTER ? 's' : 1140 fail & MATCH_TDMA_NOSLOT ? 'f' : 1141 fail & MATCH_TDMA_LOCAL ? 'l' : 1142 #endif 1143 fail & MATCH_MESH_NOID ? 'm' : 1144 fail ? '-' : '+', ether_sprintf(se->se_macaddr)); 1145 printf(" %s%c", ether_sprintf(se->se_bssid), 1146 fail & MATCH_BSSID ? '!' : ' '); 1147 printf(" %3d%c", ieee80211_chan2ieee(ic, se->se_chan), 1148 fail & MATCH_CHANNEL ? '!' : ' '); 1149 printf(" %+4d%c", se->se_rssi, fail & MATCH_RSSI ? '!' : ' '); 1150 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, 1151 fail & MATCH_RATE ? '!' : ' '); 1152 printf(" %4s%c", 1153 (se->se_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : 1154 (se->se_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "", 1155 fail & MATCH_CAPINFO ? '!' : ' '); 1156 printf(" %3s%c ", 1157 (se->se_capinfo & IEEE80211_CAPINFO_PRIVACY) ? 1158 "wep" : "no", 1159 fail & MATCH_PRIVACY ? '!' : ' '); 1160 ieee80211_print_essid(se->se_ssid+2, se->se_ssid[1]); 1161 printf("%s\n", fail & (MATCH_SSID | MATCH_MESHID) ? "!" : ""); 1162 } 1163 #endif 1164 return fail; 1165 } 1166 1167 static void 1168 sta_update_notseen(struct sta_table *st) 1169 { 1170 struct sta_entry *se; 1171 1172 IEEE80211_SCAN_TABLE_LOCK(st); 1173 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1174 /* 1175 * If seen the reset and don't bump the count; 1176 * otherwise bump the ``not seen'' count. Note 1177 * that this insures that stations for which we 1178 * see frames while not scanning but not during 1179 * this scan will not be penalized. 1180 */ 1181 if (se->se_seen) 1182 se->se_seen = 0; 1183 else 1184 se->se_notseen++; 1185 } 1186 IEEE80211_SCAN_TABLE_UNLOCK(st); 1187 } 1188 1189 static void 1190 sta_dec_fails(struct sta_table *st) 1191 { 1192 struct sta_entry *se; 1193 1194 IEEE80211_SCAN_TABLE_LOCK(st); 1195 TAILQ_FOREACH(se, &st->st_entry, se_list) 1196 if (se->se_fails) 1197 se->se_fails--; 1198 IEEE80211_SCAN_TABLE_UNLOCK(st); 1199 } 1200 1201 static struct sta_entry * 1202 select_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap, int debug) 1203 { 1204 struct sta_table *st = ss->ss_priv; 1205 struct sta_entry *se, *selbs = NULL; 1206 1207 IEEE80211_DPRINTF(vap, debug, " %s\n", 1208 "macaddr bssid chan rssi rate flag wep essid"); 1209 IEEE80211_SCAN_TABLE_LOCK(st); 1210 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1211 ieee80211_ies_expand(&se->base.se_ies); 1212 if (match_bss(vap, ss, se, debug) == 0) { 1213 if (selbs == NULL) 1214 selbs = se; 1215 else if (sta_compare(se, selbs) > 0) 1216 selbs = se; 1217 } 1218 } 1219 IEEE80211_SCAN_TABLE_UNLOCK(st); 1220 1221 return selbs; 1222 } 1223 1224 /* 1225 * Pick an ap or ibss network to join or find a channel 1226 * to use to start an ibss network. 1227 */ 1228 static int 1229 sta_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1230 { 1231 struct sta_table *st = ss->ss_priv; 1232 struct sta_entry *selbs; 1233 struct ieee80211_channel *chan; 1234 1235 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1236 ("wrong mode %u", vap->iv_opmode)); 1237 1238 if (st->st_newscan) { 1239 sta_update_notseen(st); 1240 st->st_newscan = 0; 1241 } 1242 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1243 /* 1244 * Manual/background scan, don't select+join the 1245 * bss, just return. The scanning framework will 1246 * handle notification that this has completed. 1247 */ 1248 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1249 return 1; 1250 } 1251 /* 1252 * Automatic sequencing; look for a candidate and 1253 * if found join the network. 1254 */ 1255 /* NB: unlocked read should be ok */ 1256 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1257 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1258 "%s: no scan candidate\n", __func__); 1259 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1260 return 0; 1261 notfound: 1262 /* 1263 * If nothing suitable was found decrement 1264 * the failure counts so entries will be 1265 * reconsidered the next time around. We 1266 * really want to do this only for sta's 1267 * where we've previously had some success. 1268 */ 1269 sta_dec_fails(st); 1270 st->st_newscan = 1; 1271 return 0; /* restart scan */ 1272 } 1273 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1274 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1275 return (selbs != NULL); 1276 if (selbs == NULL) 1277 goto notfound; 1278 chan = selbs->base.se_chan; 1279 if (selbs->se_flags & STA_DEMOTE11B) 1280 chan = demote11b(vap, chan); 1281 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1282 goto notfound; 1283 return 1; /* terminate scan */ 1284 } 1285 1286 /* 1287 * Lookup an entry in the scan cache. We assume we're 1288 * called from the bottom half or such that we don't need 1289 * to block the bottom half so that it's safe to return 1290 * a reference to an entry w/o holding the lock on the table. 1291 */ 1292 static struct sta_entry * 1293 sta_lookup(struct sta_table *st, const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1294 { 1295 struct sta_entry *se; 1296 int hash = STA_HASH(macaddr); 1297 1298 IEEE80211_SCAN_TABLE_LOCK(st); 1299 LIST_FOREACH(se, &st->st_hash[hash], se_hash) 1300 if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr)) 1301 break; 1302 IEEE80211_SCAN_TABLE_UNLOCK(st); 1303 1304 return se; /* NB: unlocked */ 1305 } 1306 1307 static void 1308 sta_roam_check(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1309 { 1310 struct ieee80211com *ic = vap->iv_ic; 1311 struct ieee80211_node *ni = vap->iv_bss; 1312 struct sta_table *st = ss->ss_priv; 1313 enum ieee80211_phymode mode; 1314 struct sta_entry *se, *selbs; 1315 uint8_t roamRate, curRate, ucastRate; 1316 int8_t roamRssi, curRssi; 1317 1318 se = sta_lookup(st, ni->ni_macaddr); 1319 if (se == NULL) { 1320 /* XXX something is wrong */ 1321 return; 1322 } 1323 1324 mode = ieee80211_chan2mode(ic->ic_bsschan); 1325 roamRate = vap->iv_roamparms[mode].rate; 1326 roamRssi = vap->iv_roamparms[mode].rssi; 1327 KASSERT(roamRate != 0 && roamRssi != 0, ("iv_roamparms are not" 1328 "initialized for %s mode!", ieee80211_phymode_name[mode])); 1329 1330 ucastRate = vap->iv_txparms[mode].ucastrate; 1331 /* NB: the most up to date rssi is in the node, not the scan cache */ 1332 curRssi = ic->ic_node_getrssi(ni); 1333 if (ucastRate == IEEE80211_FIXED_RATE_NONE) { 1334 curRate = ni->ni_txrate; 1335 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1336 "%s: currssi %d currate %u roamrssi %d roamrate %u\n", 1337 __func__, curRssi, curRate, roamRssi, roamRate); 1338 } else { 1339 curRate = roamRate; /* NB: insure compare below fails */ 1340 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ROAM, 1341 "%s: currssi %d roamrssi %d\n", __func__, curRssi, roamRssi); 1342 } 1343 /* 1344 * Check if a new ap should be used and switch. 1345 * XXX deauth current ap 1346 */ 1347 if (curRate < roamRate || curRssi < roamRssi) { 1348 if (ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 1349 /* 1350 * Scan cache contents are too old; force a scan now 1351 * if possible so we have current state to make a 1352 * decision with. We don't kick off a bg scan if 1353 * we're using dynamic turbo and boosted or if the 1354 * channel is busy. 1355 * XXX force immediate switch on scan complete 1356 */ 1357 if (!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1358 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)) 1359 ieee80211_bg_scan(vap, 0); 1360 return; 1361 } 1362 se->base.se_rssi = curRssi; 1363 selbs = select_bss(ss, vap, IEEE80211_MSG_ROAM); 1364 if (selbs != NULL && selbs != se) { 1365 struct ieee80211_channel *chan; 1366 1367 IEEE80211_DPRINTF(vap, 1368 IEEE80211_MSG_ROAM | IEEE80211_MSG_DEBUG, 1369 "%s: ROAM: curRate %u, roamRate %u, " 1370 "curRssi %d, roamRssi %d\n", __func__, 1371 curRate, roamRate, curRssi, roamRssi); 1372 1373 chan = selbs->base.se_chan; 1374 if (selbs->se_flags & STA_DEMOTE11B) 1375 chan = demote11b(vap, chan); 1376 (void) ieee80211_sta_join(vap, chan, &selbs->base); 1377 } 1378 } 1379 } 1380 1381 /* 1382 * Age entries in the scan cache. 1383 * XXX also do roaming since it's convenient 1384 */ 1385 static void 1386 sta_age(struct ieee80211_scan_state *ss) 1387 { 1388 struct ieee80211vap *vap = ss->ss_vap; 1389 1390 adhoc_age(ss); 1391 /* 1392 * If rate control is enabled check periodically to see if 1393 * we should roam from our current connection to one that 1394 * might be better. This only applies when we're operating 1395 * in sta mode and automatic roaming is set. 1396 * XXX defer if busy 1397 * XXX repeater station 1398 * XXX do when !bgscan? 1399 */ 1400 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1401 ("wrong mode %u", vap->iv_opmode)); 1402 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO && 1403 (vap->iv_flags & IEEE80211_F_BGSCAN) && 1404 vap->iv_state >= IEEE80211_S_RUN) 1405 /* XXX vap is implicit */ 1406 sta_roam_check(ss, vap); 1407 } 1408 1409 /* 1410 * Iterate over the entries in the scan cache, invoking 1411 * the callback function on each one. 1412 */ 1413 static void 1414 sta_iterate(struct ieee80211_scan_state *ss, 1415 ieee80211_scan_iter_func *f, void *arg) 1416 { 1417 struct sta_table *st = ss->ss_priv; 1418 struct sta_entry *se; 1419 u_int gen; 1420 1421 IEEE80211_SCAN_ITER_LOCK(st); 1422 gen = st->st_scaniter++; 1423 restart: 1424 IEEE80211_SCAN_TABLE_LOCK(st); 1425 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1426 if (se->se_scangen != gen) { 1427 se->se_scangen = gen; 1428 /* update public state */ 1429 se->base.se_age = ticks - se->se_lastupdate; 1430 IEEE80211_SCAN_TABLE_UNLOCK(st); 1431 (*f)(arg, &se->base); 1432 goto restart; 1433 } 1434 } 1435 IEEE80211_SCAN_TABLE_UNLOCK(st); 1436 1437 IEEE80211_SCAN_ITER_UNLOCK(st); 1438 } 1439 1440 static void 1441 sta_assoc_fail(struct ieee80211_scan_state *ss, 1442 const uint8_t macaddr[IEEE80211_ADDR_LEN], int reason) 1443 { 1444 struct sta_table *st = ss->ss_priv; 1445 struct sta_entry *se; 1446 1447 se = sta_lookup(st, macaddr); 1448 if (se != NULL) { 1449 se->se_fails++; 1450 se->se_lastfail = ticks; 1451 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1452 macaddr, "%s: reason %u fails %u", 1453 __func__, reason, se->se_fails); 1454 } 1455 } 1456 1457 static void 1458 sta_assoc_success(struct ieee80211_scan_state *ss, 1459 const uint8_t macaddr[IEEE80211_ADDR_LEN]) 1460 { 1461 struct sta_table *st = ss->ss_priv; 1462 struct sta_entry *se; 1463 1464 se = sta_lookup(st, macaddr); 1465 if (se != NULL) { 1466 #if 0 1467 se->se_fails = 0; 1468 IEEE80211_NOTE_MAC(ss->ss_vap, IEEE80211_MSG_SCAN, 1469 macaddr, "%s: fails %u", 1470 __func__, se->se_fails); 1471 #endif 1472 se->se_lastassoc = ticks; 1473 } 1474 } 1475 1476 static const struct ieee80211_scanner sta_default = { 1477 .scan_name = "default", 1478 .scan_attach = sta_attach, 1479 .scan_detach = sta_detach, 1480 .scan_start = sta_start, 1481 .scan_restart = sta_restart, 1482 .scan_cancel = sta_cancel, 1483 .scan_end = sta_pick_bss, 1484 .scan_flush = sta_flush, 1485 .scan_add = sta_add, 1486 .scan_age = sta_age, 1487 .scan_iterate = sta_iterate, 1488 .scan_assoc_fail = sta_assoc_fail, 1489 .scan_assoc_success = sta_assoc_success, 1490 }; 1491 IEEE80211_SCANNER_ALG(sta, IEEE80211_M_STA, sta_default); 1492 1493 /* 1494 * Adhoc mode-specific support. 1495 */ 1496 1497 static const uint16_t adhocWorld[] = /* 36, 40, 44, 48 */ 1498 { 5180, 5200, 5220, 5240 }; 1499 static const uint16_t adhocFcc3[] = /* 36, 40, 44, 48 145, 149, 153, 157, 161, 165 */ 1500 { 5180, 5200, 5220, 5240, 5725, 5745, 5765, 5785, 5805, 5825 }; 1501 static const uint16_t adhocMkk[] = /* 34, 38, 42, 46 */ 1502 { 5170, 5190, 5210, 5230 }; 1503 static const uint16_t adhoc11b[] = /* 10, 11 */ 1504 { 2457, 2462 }; 1505 1506 static const struct scanlist adhocScanTable[] = { 1507 { IEEE80211_MODE_11B, X(adhoc11b) }, 1508 { IEEE80211_MODE_11A, X(adhocWorld) }, 1509 { IEEE80211_MODE_11A, X(adhocFcc3) }, 1510 { IEEE80211_MODE_11B, X(adhocMkk) }, 1511 { .list = NULL } 1512 }; 1513 #undef X 1514 1515 /* 1516 * Start an adhoc-mode scan by populating the channel list. 1517 */ 1518 static int 1519 adhoc_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1520 { 1521 struct sta_table *st = ss->ss_priv; 1522 1523 makescanlist(ss, vap, adhocScanTable); 1524 1525 if (ss->ss_mindwell == 0) 1526 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1527 if (ss->ss_maxdwell == 0) 1528 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1529 1530 st->st_scangen++; 1531 st->st_newscan = 1; 1532 1533 return 0; 1534 } 1535 1536 /* 1537 * Select a channel to start an adhoc network on. 1538 * The channel list was populated with appropriate 1539 * channels so select one that looks least occupied. 1540 */ 1541 static struct ieee80211_channel * 1542 adhoc_pick_channel(struct ieee80211_scan_state *ss, int flags) 1543 { 1544 struct sta_table *st = ss->ss_priv; 1545 struct sta_entry *se; 1546 struct ieee80211_channel *c, *bestchan; 1547 int i, bestrssi, maxrssi; 1548 1549 bestchan = NULL; 1550 bestrssi = -1; 1551 1552 IEEE80211_SCAN_TABLE_LOCK(st); 1553 for (i = 0; i < ss->ss_last; i++) { 1554 c = ss->ss_chans[i]; 1555 /* never consider a channel with radar */ 1556 if (IEEE80211_IS_CHAN_RADAR(c)) 1557 continue; 1558 /* skip channels disallowed by regulatory settings */ 1559 if (IEEE80211_IS_CHAN_NOADHOC(c)) 1560 continue; 1561 /* check channel attributes for band compatibility */ 1562 if (flags != 0 && (c->ic_flags & flags) != flags) 1563 continue; 1564 maxrssi = 0; 1565 TAILQ_FOREACH(se, &st->st_entry, se_list) { 1566 if (se->base.se_chan != c) 1567 continue; 1568 if (se->base.se_rssi > maxrssi) 1569 maxrssi = se->base.se_rssi; 1570 } 1571 if (bestchan == NULL || maxrssi < bestrssi) 1572 bestchan = c; 1573 } 1574 IEEE80211_SCAN_TABLE_UNLOCK(st); 1575 1576 return bestchan; 1577 } 1578 1579 /* 1580 * Pick an ibss network to join or find a channel 1581 * to use to start an ibss network. 1582 */ 1583 static int 1584 adhoc_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1585 { 1586 struct sta_table *st = ss->ss_priv; 1587 struct sta_entry *selbs; 1588 struct ieee80211_channel *chan; 1589 struct ieee80211com *ic = vap->iv_ic; 1590 1591 KASSERT(vap->iv_opmode == IEEE80211_M_IBSS || 1592 vap->iv_opmode == IEEE80211_M_AHDEMO || 1593 vap->iv_opmode == IEEE80211_M_MBSS, 1594 ("wrong opmode %u", vap->iv_opmode)); 1595 1596 if (st->st_newscan) { 1597 sta_update_notseen(st); 1598 st->st_newscan = 0; 1599 } 1600 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1601 /* 1602 * Manual/background scan, don't select+join the 1603 * bss, just return. The scanning framework will 1604 * handle notification that this has completed. 1605 */ 1606 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1607 return 1; 1608 } 1609 /* 1610 * Automatic sequencing; look for a candidate and 1611 * if found join the network. 1612 */ 1613 /* NB: unlocked read should be ok */ 1614 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1615 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1616 "%s: no scan candidate\n", __func__); 1617 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1618 return 0; 1619 notfound: 1620 /* NB: never auto-start a tdma network for slot !0 */ 1621 #ifdef IEEE80211_SUPPORT_TDMA 1622 if (vap->iv_des_nssid && 1623 ((vap->iv_caps & IEEE80211_C_TDMA) == 0 || 1624 ieee80211_tdma_getslot(vap) == 0)) { 1625 #else 1626 if (vap->iv_des_nssid) { 1627 #endif 1628 /* 1629 * No existing adhoc network to join and we have 1630 * an ssid; start one up. If no channel was 1631 * specified, try to select a channel. 1632 */ 1633 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1634 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1635 chan = adhoc_pick_channel(ss, 0); 1636 } else 1637 chan = vap->iv_des_chan; 1638 if (chan != NULL) { 1639 /* 1640 * Create a HT capable IBSS; the per-node 1641 * probe request/response will result in 1642 * "correct" rate control capabilities being 1643 * negotiated. 1644 */ 1645 chan = ieee80211_ht_adjust_channel(ic, 1646 chan, vap->iv_flags_ht); 1647 ieee80211_create_ibss(vap, chan); 1648 return 1; 1649 } 1650 } 1651 /* 1652 * If nothing suitable was found decrement 1653 * the failure counts so entries will be 1654 * reconsidered the next time around. We 1655 * really want to do this only for sta's 1656 * where we've previously had some success. 1657 */ 1658 sta_dec_fails(st); 1659 st->st_newscan = 1; 1660 return 0; /* restart scan */ 1661 } 1662 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1663 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1664 return (selbs != NULL); 1665 if (selbs == NULL) 1666 goto notfound; 1667 chan = selbs->base.se_chan; 1668 if (selbs->se_flags & STA_DEMOTE11B) 1669 chan = demote11b(vap, chan); 1670 /* 1671 * If HT is available, make it a possibility here. 1672 * The intent is to enable HT20/HT40 when joining a non-HT 1673 * IBSS node; we can then advertise HT IEs and speak HT 1674 * to any subsequent nodes that support it. 1675 */ 1676 chan = ieee80211_ht_adjust_channel(ic, 1677 chan, vap->iv_flags_ht); 1678 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1679 goto notfound; 1680 return 1; /* terminate scan */ 1681 } 1682 1683 /* 1684 * Age entries in the scan cache. 1685 */ 1686 static void 1687 adhoc_age(struct ieee80211_scan_state *ss) 1688 { 1689 struct sta_table *st = ss->ss_priv; 1690 struct sta_entry *se, *next; 1691 1692 IEEE80211_SCAN_TABLE_LOCK(st); 1693 TAILQ_FOREACH_SAFE(se, &st->st_entry, se_list, next) { 1694 if (se->se_notseen > STA_PURGE_SCANS) { 1695 TAILQ_REMOVE(&st->st_entry, se, se_list); 1696 LIST_REMOVE(se, se_hash); 1697 ieee80211_ies_cleanup(&se->base.se_ies); 1698 IEEE80211_FREE(se, M_80211_SCAN); 1699 } 1700 } 1701 IEEE80211_SCAN_TABLE_UNLOCK(st); 1702 } 1703 1704 static const struct ieee80211_scanner adhoc_default = { 1705 .scan_name = "default", 1706 .scan_attach = sta_attach, 1707 .scan_detach = sta_detach, 1708 .scan_start = adhoc_start, 1709 .scan_restart = sta_restart, 1710 .scan_cancel = sta_cancel, 1711 .scan_end = adhoc_pick_bss, 1712 .scan_flush = sta_flush, 1713 .scan_pickchan = adhoc_pick_channel, 1714 .scan_add = sta_add, 1715 .scan_age = adhoc_age, 1716 .scan_iterate = sta_iterate, 1717 .scan_assoc_fail = sta_assoc_fail, 1718 .scan_assoc_success = sta_assoc_success, 1719 }; 1720 IEEE80211_SCANNER_ALG(ibss, IEEE80211_M_IBSS, adhoc_default); 1721 IEEE80211_SCANNER_ALG(ahdemo, IEEE80211_M_AHDEMO, adhoc_default); 1722 1723 static int 1724 ap_start(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1725 { 1726 struct sta_table *st = ss->ss_priv; 1727 1728 makescanlist(ss, vap, staScanTable); 1729 1730 if (ss->ss_mindwell == 0) 1731 ss->ss_mindwell = msecs_to_ticks(200); /* 200ms */ 1732 if (ss->ss_maxdwell == 0) 1733 ss->ss_maxdwell = msecs_to_ticks(200); /* 200ms */ 1734 1735 st->st_scangen++; 1736 st->st_newscan = 1; 1737 1738 return 0; 1739 } 1740 1741 /* 1742 * Cancel an ongoing scan. 1743 */ 1744 static int 1745 ap_cancel(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1746 { 1747 return 0; 1748 } 1749 1750 /* 1751 * Pick a quiet channel to use for ap operation. 1752 */ 1753 static struct ieee80211_channel * 1754 ap_pick_channel(struct ieee80211_scan_state *ss, int flags) 1755 { 1756 struct sta_table *st = ss->ss_priv; 1757 struct ieee80211_channel *bestchan = NULL; 1758 int i; 1759 1760 /* XXX select channel more intelligently, e.g. channel spread, power */ 1761 /* NB: use scan list order to preserve channel preference */ 1762 for (i = 0; i < ss->ss_last; i++) { 1763 struct ieee80211_channel *chan = ss->ss_chans[i]; 1764 /* 1765 * If the channel is unoccupied the max rssi 1766 * should be zero; just take it. Otherwise 1767 * track the channel with the lowest rssi and 1768 * use that when all channels appear occupied. 1769 */ 1770 if (IEEE80211_IS_CHAN_RADAR(chan)) 1771 continue; 1772 if (IEEE80211_IS_CHAN_NOHOSTAP(chan)) 1773 continue; 1774 /* check channel attributes for band compatibility */ 1775 if (flags != 0 && (chan->ic_flags & flags) != flags) 1776 continue; 1777 KASSERT(sizeof(chan->ic_ieee) == 1, ("ic_chan size")); 1778 /* XXX channel have interference */ 1779 if (st->st_maxrssi[chan->ic_ieee] == 0) { 1780 /* XXX use other considerations */ 1781 return chan; 1782 } 1783 if (bestchan == NULL || 1784 st->st_maxrssi[chan->ic_ieee] < st->st_maxrssi[bestchan->ic_ieee]) 1785 bestchan = chan; 1786 } 1787 return bestchan; 1788 } 1789 1790 /* 1791 * Pick a quiet channel to use for ap operation. 1792 */ 1793 static int 1794 ap_end(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1795 { 1796 struct ieee80211com *ic = vap->iv_ic; 1797 struct ieee80211_channel *bestchan; 1798 1799 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 1800 ("wrong opmode %u", vap->iv_opmode)); 1801 bestchan = ap_pick_channel(ss, 0); 1802 if (bestchan == NULL) { 1803 /* no suitable channel, should not happen */ 1804 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1805 "%s: no suitable channel! (should not happen)\n", __func__); 1806 /* XXX print something? */ 1807 return 0; /* restart scan */ 1808 } 1809 /* 1810 * If this is a dynamic turbo channel, start with the unboosted one. 1811 */ 1812 if (IEEE80211_IS_CHAN_TURBO(bestchan)) { 1813 bestchan = ieee80211_find_channel(ic, bestchan->ic_freq, 1814 bestchan->ic_flags & ~IEEE80211_CHAN_TURBO); 1815 if (bestchan == NULL) { 1816 /* should never happen ?? */ 1817 return 0; 1818 } 1819 } 1820 if (ss->ss_flags & (IEEE80211_SCAN_NOPICK | IEEE80211_SCAN_NOJOIN)) { 1821 /* 1822 * Manual/background scan, don't select+join the 1823 * bss, just return. The scanning framework will 1824 * handle notification that this has completed. 1825 */ 1826 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1827 return 1; 1828 } 1829 ieee80211_create_ibss(vap, 1830 ieee80211_ht_adjust_channel(ic, bestchan, vap->iv_flags_ht)); 1831 return 1; 1832 } 1833 1834 static const struct ieee80211_scanner ap_default = { 1835 .scan_name = "default", 1836 .scan_attach = sta_attach, 1837 .scan_detach = sta_detach, 1838 .scan_start = ap_start, 1839 .scan_restart = sta_restart, 1840 .scan_cancel = ap_cancel, 1841 .scan_end = ap_end, 1842 .scan_flush = sta_flush, 1843 .scan_pickchan = ap_pick_channel, 1844 .scan_add = sta_add, 1845 .scan_age = adhoc_age, 1846 .scan_iterate = sta_iterate, 1847 .scan_assoc_success = sta_assoc_success, 1848 .scan_assoc_fail = sta_assoc_fail, 1849 }; 1850 IEEE80211_SCANNER_ALG(ap, IEEE80211_M_HOSTAP, ap_default); 1851 1852 #ifdef IEEE80211_SUPPORT_MESH 1853 /* 1854 * Pick an mbss network to join or find a channel 1855 * to use to start an mbss network. 1856 */ 1857 static int 1858 mesh_pick_bss(struct ieee80211_scan_state *ss, struct ieee80211vap *vap) 1859 { 1860 struct sta_table *st = ss->ss_priv; 1861 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1862 struct sta_entry *selbs; 1863 struct ieee80211_channel *chan; 1864 1865 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, 1866 ("wrong opmode %u", vap->iv_opmode)); 1867 1868 if (st->st_newscan) { 1869 sta_update_notseen(st); 1870 st->st_newscan = 0; 1871 } 1872 if (ss->ss_flags & IEEE80211_SCAN_NOPICK) { 1873 /* 1874 * Manual/background scan, don't select+join the 1875 * bss, just return. The scanning framework will 1876 * handle notification that this has completed. 1877 */ 1878 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 1879 return 1; 1880 } 1881 /* 1882 * Automatic sequencing; look for a candidate and 1883 * if found join the network. 1884 */ 1885 /* NB: unlocked read should be ok */ 1886 if (TAILQ_FIRST(&st->st_entry) == NULL) { 1887 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1888 "%s: no scan candidate\n", __func__); 1889 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1890 return 0; 1891 notfound: 1892 if (ms->ms_idlen != 0) { 1893 /* 1894 * No existing mbss network to join and we have 1895 * a meshid; start one up. If no channel was 1896 * specified, try to select a channel. 1897 */ 1898 if (vap->iv_des_chan == IEEE80211_CHAN_ANYC || 1899 IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 1900 struct ieee80211com *ic = vap->iv_ic; 1901 1902 chan = adhoc_pick_channel(ss, 0); 1903 if (chan != NULL) 1904 chan = ieee80211_ht_adjust_channel(ic, 1905 chan, vap->iv_flags_ht); 1906 } else 1907 chan = vap->iv_des_chan; 1908 if (chan != NULL) { 1909 ieee80211_create_ibss(vap, chan); 1910 return 1; 1911 } 1912 } 1913 /* 1914 * If nothing suitable was found decrement 1915 * the failure counts so entries will be 1916 * reconsidered the next time around. We 1917 * really want to do this only for sta's 1918 * where we've previously had some success. 1919 */ 1920 sta_dec_fails(st); 1921 st->st_newscan = 1; 1922 return 0; /* restart scan */ 1923 } 1924 selbs = select_bss(ss, vap, IEEE80211_MSG_SCAN); 1925 if (ss->ss_flags & IEEE80211_SCAN_NOJOIN) 1926 return (selbs != NULL); 1927 if (selbs == NULL) 1928 goto notfound; 1929 chan = selbs->base.se_chan; 1930 if (selbs->se_flags & STA_DEMOTE11B) 1931 chan = demote11b(vap, chan); 1932 if (!ieee80211_sta_join(vap, chan, &selbs->base)) 1933 goto notfound; 1934 return 1; /* terminate scan */ 1935 } 1936 1937 static const struct ieee80211_scanner mesh_default = { 1938 .scan_name = "default", 1939 .scan_attach = sta_attach, 1940 .scan_detach = sta_detach, 1941 .scan_start = adhoc_start, 1942 .scan_restart = sta_restart, 1943 .scan_cancel = sta_cancel, 1944 .scan_end = mesh_pick_bss, 1945 .scan_flush = sta_flush, 1946 .scan_pickchan = adhoc_pick_channel, 1947 .scan_add = sta_add, 1948 .scan_age = adhoc_age, 1949 .scan_iterate = sta_iterate, 1950 .scan_assoc_fail = sta_assoc_fail, 1951 .scan_assoc_success = sta_assoc_success, 1952 }; 1953 IEEE80211_SCANNER_ALG(mesh, IEEE80211_M_MBSS, mesh_default); 1954 #endif /* IEEE80211_SUPPORT_MESH */
Cache object: e7175b77743b39bc4289ebbbf0443b49
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