1/*- 2 * Copyright (c) 2002-2008 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: stable/11/sys/net80211/ieee80211_scan.c 344223 2019-02-17 03:12:27Z avos $"); 28 29/* 30 * IEEE 802.11 scanning support. 31 */ 32#include "opt_wlan.h" 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/proc.h> 37#include <sys/kernel.h> 38#include <sys/malloc.h> 39#include <sys/condvar.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 50/* XXX until it's implemented as attach ops */ 51#include <net80211/ieee80211_scan_sw.h> 52 53#include <net/bpf.h> 54 55/* 56 * Roaming-related defaults. RSSI thresholds are as returned by the 57 * driver (.5dBm). Transmit rate thresholds are IEEE rate codes (i.e 58 * .5M units) or MCS. 59 */ 60/* rssi thresholds */ 61#define ROAM_RSSI_11A_DEFAULT 14 /* 11a bss */ 62#define ROAM_RSSI_11B_DEFAULT 14 /* 11b bss */ 63#define ROAM_RSSI_11BONLY_DEFAULT 14 /* 11b-only bss */ 64/* transmit rate thresholds */ 65#define ROAM_RATE_11A_DEFAULT 2*12 /* 11a bss */ 66#define ROAM_RATE_11B_DEFAULT 2*5 /* 11b bss */ 67#define ROAM_RATE_11BONLY_DEFAULT 2*1 /* 11b-only bss */ 68#define ROAM_RATE_HALF_DEFAULT 2*6 /* half-width 11a/g bss */ 69#define ROAM_RATE_QUARTER_DEFAULT 2*3 /* quarter-width 11a/g bss */ 70#define ROAM_MCS_11N_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11n bss */ 71 72void 73ieee80211_scan_attach(struct ieee80211com *ic) 74{ 75 /* 76 * If there's no scan method pointer, attach the 77 * swscan set as a default. 78 */ 79 if (ic->ic_scan_methods == NULL) 80 ieee80211_swscan_attach(ic); 81 else 82 ic->ic_scan_methods->sc_attach(ic); 83} 84 85void 86ieee80211_scan_detach(struct ieee80211com *ic) 87{ 88 89 /* 90 * Ideally we'd do the ss_ops detach call here; 91 * but then sc_detach() would need to be split in two. 92 * 93 * I'll do that later. 94 */ 95 ic->ic_scan_methods->sc_detach(ic); 96} 97 98static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = { 99 [IEEE80211_MODE_11A] = { .rssi = ROAM_RSSI_11A_DEFAULT, 100 .rate = ROAM_RATE_11A_DEFAULT }, 101 [IEEE80211_MODE_11G] = { .rssi = ROAM_RSSI_11B_DEFAULT, 102 .rate = ROAM_RATE_11B_DEFAULT }, 103 [IEEE80211_MODE_11B] = { .rssi = ROAM_RSSI_11BONLY_DEFAULT, 104 .rate = ROAM_RATE_11BONLY_DEFAULT }, 105 [IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT, 106 .rate = ROAM_RATE_11A_DEFAULT }, 107 [IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT, 108 .rate = ROAM_RATE_11A_DEFAULT }, 109 [IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT, 110 .rate = ROAM_RATE_11A_DEFAULT }, 111 [IEEE80211_MODE_HALF] = { .rssi = ROAM_RSSI_11A_DEFAULT, 112 .rate = ROAM_RATE_HALF_DEFAULT }, 113 [IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT, 114 .rate = ROAM_RATE_QUARTER_DEFAULT }, 115 [IEEE80211_MODE_11NA] = { .rssi = ROAM_RSSI_11A_DEFAULT, 116 .rate = ROAM_MCS_11N_DEFAULT }, 117 [IEEE80211_MODE_11NG] = { .rssi = ROAM_RSSI_11B_DEFAULT, 118 .rate = ROAM_MCS_11N_DEFAULT }, 119}; 120 121void 122ieee80211_scan_vattach(struct ieee80211vap *vap) 123{ 124 struct ieee80211com *ic = vap->iv_ic; 125 int m; 126 127 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz; 128 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz; 129 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz; 130 131 vap->iv_roaming = IEEE80211_ROAMING_AUTO; 132 133 memset(vap->iv_roamparms, 0, sizeof(vap->iv_roamparms)); 134 for (m = IEEE80211_MODE_AUTO + 1; m < IEEE80211_MODE_MAX; m++) { 135 if (isclr(ic->ic_modecaps, m)) 136 continue; 137 138 memcpy(&vap->iv_roamparms[m], &defroam[m], sizeof(defroam[m])); 139 } 140 141 ic->ic_scan_methods->sc_vattach(vap); 142} 143 144void 145ieee80211_scan_vdetach(struct ieee80211vap *vap) 146{ 147 struct ieee80211com *ic = vap->iv_ic; 148 struct ieee80211_scan_state *ss; 149 150 IEEE80211_LOCK(ic); 151 ss = ic->ic_scan; 152 153 ic->ic_scan_methods->sc_vdetach(vap); 154 155 if (ss != NULL && ss->ss_vap == vap) { 156 if (ss->ss_ops != NULL) { 157 ss->ss_ops->scan_detach(ss); 158 ss->ss_ops = NULL; 159 } 160 ss->ss_vap = NULL; 161 } 162 IEEE80211_UNLOCK(ic); 163} 164 165/* 166 * Simple-minded scanner module support. 167 */ 168static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 169 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 170 "wlan_scan_sta", /* IEEE80211_M_STA */ 171 "wlan_scan_wds", /* IEEE80211_M_WDS */ 172 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 173 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 174 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 175 "wlan_scan_sta", /* IEEE80211_M_MBSS */ 176}; 177static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 178 179const struct ieee80211_scanner * 180ieee80211_scanner_get(enum ieee80211_opmode mode) 181{ 182 if (mode >= IEEE80211_OPMODE_MAX) 183 return NULL; 184 if (scanners[mode] == NULL) 185 ieee80211_load_module(scan_modnames[mode]); 186 return scanners[mode]; 187} 188 189void 190ieee80211_scanner_register(enum ieee80211_opmode mode, 191 const struct ieee80211_scanner *scan) 192{ 193 if (mode >= IEEE80211_OPMODE_MAX) 194 return; 195 scanners[mode] = scan; 196} 197 198void 199ieee80211_scanner_unregister(enum ieee80211_opmode mode, 200 const struct ieee80211_scanner *scan) 201{ 202 if (mode >= IEEE80211_OPMODE_MAX) 203 return; 204 if (scanners[mode] == scan) 205 scanners[mode] = NULL; 206} 207 208void 209ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 210{ 211 int m; 212 213 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 214 if (scanners[m] == scan) 215 scanners[m] = NULL; 216} 217 218/* 219 * Update common scanner state to reflect the current 220 * operating mode. This is called when the state machine 221 * is transitioned to RUN state w/o scanning--e.g. when 222 * operating in monitor mode. The purpose of this is to 223 * ensure later callbacks find ss_ops set to properly 224 * reflect current operating mode. 225 */ 226void 227ieee80211_scan_update_locked(struct ieee80211vap *vap, 228 const struct ieee80211_scanner *scan) 229{ 230 struct ieee80211com *ic = vap->iv_ic; 231 struct ieee80211_scan_state *ss = ic->ic_scan; 232 233 IEEE80211_LOCK_ASSERT(ic); 234 235#ifdef IEEE80211_DEBUG 236 if (ss->ss_vap != vap || ss->ss_ops != scan) { 237 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 238 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 239 __func__, 240 ss->ss_vap != NULL ? 241 ss->ss_vap->iv_ifp->if_xname : "none", 242 ss->ss_vap != NULL ? 243 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 244 vap->iv_ifp->if_xname, 245 ieee80211_opmode_name[vap->iv_opmode]); 246 } 247#endif 248 ss->ss_vap = vap; 249 if (ss->ss_ops != scan) { 250 /* 251 * Switch scanners; detach old, attach new. Special 252 * case where a single scan module implements multiple 253 * policies by using different scan ops but a common 254 * core. We assume if the old and new attach methods 255 * are identical then it's ok to just change ss_ops 256 * and not flush the internal state of the module. 257 */ 258 if (scan == NULL || ss->ss_ops == NULL || 259 ss->ss_ops->scan_attach != scan->scan_attach) { 260 if (ss->ss_ops != NULL) 261 ss->ss_ops->scan_detach(ss); 262 if (scan != NULL && !scan->scan_attach(ss)) { 263 /* XXX attach failure */ 264 /* XXX stat+msg */ 265 scan = NULL; 266 } 267 } 268 ss->ss_ops = scan; 269 } 270} 271 272void 273ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 274{ 275 struct ieee80211com *ic = ss->ss_ic; 276 const char *sep; 277 int i; 278 279 sep = ""; 280 for (i = ss->ss_next; i < ss->ss_last; i++) { 281 const struct ieee80211_channel *c = ss->ss_chans[i]; 282 283 printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 284 ieee80211_channel_type_char(c)); 285 sep = ", "; 286 } 287} 288 289#ifdef IEEE80211_DEBUG 290void 291ieee80211_scan_dump(struct ieee80211_scan_state *ss) 292{ 293 struct ieee80211vap *vap = ss->ss_vap; 294 295 if_printf(vap->iv_ifp, "scan set "); 296 ieee80211_scan_dump_channels(ss); 297 printf(" dwell min %lums max %lums\n", 298 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 299} 300#endif /* IEEE80211_DEBUG */ 301 302void 303ieee80211_scan_copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 304 int nssid, const struct ieee80211_scan_ssid ssids[]) 305{ 306 if (nssid > IEEE80211_SCAN_MAX_SSID) { 307 /* XXX printf */ 308 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 309 "%s: too many ssid %d, ignoring all of them\n", 310 __func__, nssid); 311 return; 312 } 313 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 314 ss->ss_nssid = nssid; 315} 316 317/* 318 * Start a scan unless one is already going. 319 */ 320int 321ieee80211_start_scan(struct ieee80211vap *vap, int flags, 322 u_int duration, u_int mindwell, u_int maxdwell, 323 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 324{ 325 const struct ieee80211_scanner *scan; 326 struct ieee80211com *ic = vap->iv_ic; 327 328 scan = ieee80211_scanner_get(vap->iv_opmode); 329 if (scan == NULL) { 330 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 331 "%s: no scanner support for %s mode\n", 332 __func__, ieee80211_opmode_name[vap->iv_opmode]); 333 /* XXX stat */ 334 return 0; 335 } 336 337 return ic->ic_scan_methods->sc_start_scan(scan, vap, flags, duration, 338 mindwell, maxdwell, nssid, ssids); 339} 340 341/* 342 * Check the scan cache for an ap/channel to use; if that 343 * fails then kick off a new scan. 344 */ 345int 346ieee80211_check_scan(struct ieee80211vap *vap, int flags, 347 u_int duration, u_int mindwell, u_int maxdwell, 348 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 349{ 350 struct ieee80211com *ic = vap->iv_ic; 351 struct ieee80211_scan_state *ss = ic->ic_scan; 352 const struct ieee80211_scanner *scan; 353 int result; 354 355 scan = ieee80211_scanner_get(vap->iv_opmode); 356 if (scan == NULL) { 357 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 358 "%s: no scanner support for %s mode\n", 359 __func__, vap->iv_opmode); 360 /* XXX stat */ 361 return 0; 362 } 363 364 /* 365 * Check if there's a list of scan candidates already. 366 * XXX want more than the ap we're currently associated with 367 */ 368 369 IEEE80211_LOCK(ic); 370 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 371 "%s: %s scan, %s%s%s%s%s\n" 372 , __func__ 373 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 374 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 375 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 376 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 377 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 378 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 379 ); 380 381 if (ss->ss_ops != scan) { 382 /* XXX re-use cache contents? e.g. adhoc<->sta */ 383 flags |= IEEE80211_SCAN_FLUSH; 384 } 385 386 /* 387 * XXX TODO: separate things out a bit better. 388 */ 389 ieee80211_scan_update_locked(vap, scan); 390 391 result = ic->ic_scan_methods->sc_check_scan(scan, vap, flags, duration, 392 mindwell, maxdwell, nssid, ssids); 393 394 IEEE80211_UNLOCK(ic); 395 396 return (result); 397} 398 399/* 400 * Check the scan cache for an ap/channel to use; if that fails 401 * then kick off a scan using the current settings. 402 */ 403int 404ieee80211_check_scan_current(struct ieee80211vap *vap) 405{ 406 return ieee80211_check_scan(vap, 407 IEEE80211_SCAN_ACTIVE, 408 IEEE80211_SCAN_FOREVER, 0, 0, 409 vap->iv_des_nssid, vap->iv_des_ssid); 410} 411 412/* 413 * Restart a previous scan. If the previous scan completed 414 * then we start again using the existing channel list. 415 */ 416int 417ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 418{ 419 struct ieee80211com *ic = vap->iv_ic; 420 const struct ieee80211_scanner *scan; 421 422 // IEEE80211_UNLOCK_ASSERT(sc); 423 424 scan = ieee80211_scanner_get(vap->iv_opmode); 425 if (scan == NULL) { 426 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 427 "%s: no scanner support for %s mode\n", 428 __func__, vap->iv_opmode); 429 /* XXX stat */ 430 return 0; 431 } 432 433 /* 434 * XXX TODO: pull apart the bgscan logic into whatever 435 * belongs here and whatever belongs in the software 436 * scanner. 437 */ 438 return (ic->ic_scan_methods->sc_bg_scan(scan, vap, flags)); 439} 440 441/* 442 * Cancel any scan currently going on for the specified vap. 443 */ 444void 445ieee80211_cancel_scan(struct ieee80211vap *vap) 446{ 447 struct ieee80211com *ic = vap->iv_ic; 448 449 ic->ic_scan_methods->sc_cancel_scan(vap); 450} 451 452/* 453 * Cancel any scan currently going on. 454 * 455 * This is called during normal 802.11 data path to cancel 456 * a scan so a newly arrived normal data packet can be sent. 457 */ 458void 459ieee80211_cancel_anyscan(struct ieee80211vap *vap) 460{ 461 struct ieee80211com *ic = vap->iv_ic; 462 463 ic->ic_scan_methods->sc_cancel_anyscan(vap); 464} 465 466/* 467 * Manually switch to the next channel in the channel list. 468 * Provided for drivers that manage scanning themselves 469 * (e.g. for firmware-based devices). 470 */ 471void 472ieee80211_scan_next(struct ieee80211vap *vap) 473{ 474 struct ieee80211com *ic = vap->iv_ic; 475 476 ic->ic_scan_methods->sc_scan_next(vap); 477} 478 479/* 480 * Manually stop a scan that is currently running. 481 * Provided for drivers that are not able to scan single channels 482 * (e.g. for firmware-based devices). 483 */ 484void 485ieee80211_scan_done(struct ieee80211vap *vap) 486{ 487 struct ieee80211com *ic = vap->iv_ic; 488 struct ieee80211_scan_state *ss; 489 490 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__); 491 492 IEEE80211_LOCK(ic); 493 ss = ic->ic_scan; 494 ss->ss_next = ss->ss_last; /* all channels are complete */ 495 496 ic->ic_scan_methods->sc_scan_done(vap); 497 498 IEEE80211_UNLOCK(ic); 499} 500 501/* 502 * Probe the current channel, if allowed, while scanning. 503 * If the channel is not marked passive-only then send 504 * a probe request immediately. Otherwise mark state and 505 * listen for beacons on the channel; if we receive something 506 * then we'll transmit a probe request. 507 */ 508void 509ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 510{ 511 struct ieee80211com *ic = vap->iv_ic; 512 513 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 514 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 515 return; 516 } 517 518 ic->ic_scan_methods->sc_scan_probe_curchan(vap, force); 519} 520 521#ifdef IEEE80211_DEBUG 522static void 523dump_country(const uint8_t *ie) 524{ 525 const struct ieee80211_country_ie *cie = 526 (const struct ieee80211_country_ie *) ie; 527 int i, nbands, schan, nchan; 528 529 if (cie->len < 3) { 530 printf(" <bogus country ie, len %d>", cie->len); 531 return; 532 } 533 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 534 nbands = (cie->len - 3) / sizeof(cie->band[0]); 535 for (i = 0; i < nbands; i++) { 536 schan = cie->band[i].schan; 537 nchan = cie->band[i].nchan; 538 if (nchan != 1) 539 printf(" %u-%u,%u", schan, schan + nchan-1, 540 cie->band[i].maxtxpwr); 541 else 542 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 543 } 544 printf("]"); 545} 546 547void 548ieee80211_scan_dump_probe_beacon(uint8_t subtype, int isnew, 549 const uint8_t mac[IEEE80211_ADDR_LEN], 550 const struct ieee80211_scanparams *sp, int rssi) 551{ 552 553 printf("[%s] %s%s on chan %u (bss chan %u) ", 554 ether_sprintf(mac), isnew ? "new " : "", 555 ieee80211_mgt_subtype_name(subtype), sp->chan, sp->bchan); 556 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 557 printf(" rssi %d\n", rssi); 558 559 if (isnew) { 560 printf("[%s] caps 0x%x bintval %u erp 0x%x", 561 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 562 if (sp->country != NULL) 563 dump_country(sp->country); 564 printf("\n"); 565 } 566} 567#endif /* IEEE80211_DEBUG */ 568 569/* 570 * Process a beacon or probe response frame. 571 */ 572void 573ieee80211_add_scan(struct ieee80211vap *vap, 574 struct ieee80211_channel *curchan, 575 const struct ieee80211_scanparams *sp, 576 const struct ieee80211_frame *wh, 577 int subtype, int rssi, int noise) 578{ 579 struct ieee80211com *ic = vap->iv_ic; 580 581 return (ic->ic_scan_methods->sc_add_scan(vap, curchan, sp, wh, subtype, 582 rssi, noise)); 583} 584 585/* 586 * Timeout/age scan cache entries; called from sta timeout 587 * timer (XXX should be self-contained). 588 */ 589void 590ieee80211_scan_timeout(struct ieee80211com *ic) 591{ 592 struct ieee80211_scan_state *ss = ic->ic_scan; 593 594 if (ss->ss_ops != NULL) 595 ss->ss_ops->scan_age(ss); 596} 597 598/* 599 * Mark a scan cache entry after a successful associate. 600 */ 601void 602ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 603{ 604 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 605 606 if (ss->ss_ops != NULL) { 607 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 608 mac, "%s", __func__); 609 ss->ss_ops->scan_assoc_success(ss, mac); 610 } 611} 612 613/* 614 * Demerit a scan cache entry after failing to associate. 615 */ 616void 617ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 618 const uint8_t mac[], int reason) 619{ 620 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 621 622 if (ss->ss_ops != NULL) { 623 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 624 "%s: reason %u", __func__, reason); 625 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 626 } 627} 628 629/* 630 * Iterate over the contents of the scan cache. 631 */ 632void 633ieee80211_scan_iterate(struct ieee80211vap *vap, 634 ieee80211_scan_iter_func *f, void *arg) 635{ 636 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 637 638 if (ss->ss_ops != NULL) 639 ss->ss_ops->scan_iterate(ss, f, arg); 640} 641 642/* 643 * Flush the contents of the scan cache. 644 */ 645void 646ieee80211_scan_flush(struct ieee80211vap *vap) 647{ 648 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 649 650 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 651 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 652 ss->ss_ops->scan_flush(ss); 653 } 654} 655 656/* 657 * Check the scan cache for an ap/channel to use; if that 658 * fails then kick off a new scan. 659 */ 660struct ieee80211_channel * 661ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 662{ 663 struct ieee80211_scan_state *ss = ic->ic_scan; 664 665 IEEE80211_LOCK_ASSERT(ic); 666 667 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 668 /* XXX printf? */ 669 return NULL; 670 } 671 if (ss->ss_ops->scan_pickchan == NULL) { 672 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 673 "%s: scan module does not support picking a channel, " 674 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 675 return NULL; 676 } 677 return ss->ss_ops->scan_pickchan(ss, flags); 678} 679