ieee80211_scan.c revision 188924
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: head/sys/net80211/ieee80211_scan.c 188924 2009-02-22 18:46:36Z sam $"); 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/kernel.h> 37 38#include <sys/socket.h> 39 40#include <net/if.h> 41#include <net/if_media.h> 42#include <net/ethernet.h> 43 44#include <net80211/ieee80211_var.h> 45 46#include <net/bpf.h> 47 48struct scan_state { 49 struct ieee80211_scan_state base; /* public state */ 50 51 u_int ss_iflags; /* flags used internally */ 52#define ISCAN_MINDWELL 0x0001 /* min dwell time reached */ 53#define ISCAN_DISCARD 0x0002 /* discard rx'd frames */ 54#define ISCAN_CANCEL 0x0004 /* cancel current scan */ 55#define ISCAN_START 0x0008 /* 1st time through next_scan */ 56 unsigned long ss_chanmindwell; /* min dwell on curchan */ 57 unsigned long ss_scanend; /* time scan must stop */ 58 u_int ss_duration; /* duration for next scan */ 59 struct callout ss_scan_timer; /* scan timer */ 60}; 61#define SCAN_PRIVATE(ss) ((struct scan_state *) ss) 62 63/* 64 * Amount of time to go off-channel during a background 65 * scan. This value should be large enough to catch most 66 * ap's but short enough that we can return on-channel 67 * before our listen interval expires. 68 * 69 * XXX tunable 70 * XXX check against configured listen interval 71 */ 72#define IEEE80211_SCAN_OFFCHANNEL msecs_to_ticks(150) 73 74/* 75 * Roaming-related defaults. RSSI thresholds are as returned by the 76 * driver (.5dBm). Transmit rate thresholds are IEEE rate codes (i.e 77 * .5M units) or MCS. 78 */ 79/* rssi thresholds */ 80#define ROAM_RSSI_11A_DEFAULT 14 /* 11a bss */ 81#define ROAM_RSSI_11B_DEFAULT 14 /* 11b bss */ 82#define ROAM_RSSI_11BONLY_DEFAULT 14 /* 11b-only bss */ 83/* transmit rate thresholds */ 84#define ROAM_RATE_11A_DEFAULT 2*12 /* 11a bss */ 85#define ROAM_RATE_11B_DEFAULT 2*5 /* 11b bss */ 86#define ROAM_RATE_11BONLY_DEFAULT 2*1 /* 11b-only bss */ 87#define ROAM_RATE_HALF_DEFAULT 2*6 /* half-width 11a/g bss */ 88#define ROAM_RATE_QUARTER_DEFAULT 2*3 /* quarter-width 11a/g bss */ 89#define ROAM_MCS_11N_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11n bss */ 90 91static void scan_restart_pwrsav(void *); 92static void scan_curchan(struct ieee80211_scan_state *, unsigned long); 93static void scan_mindwell(struct ieee80211_scan_state *); 94static void scan_next(void *); 95 96MALLOC_DEFINE(M_80211_SCAN, "80211scan", "802.11 scan state"); 97 98void 99ieee80211_scan_attach(struct ieee80211com *ic) 100{ 101 struct scan_state *ss; 102 103 ss = (struct scan_state *) malloc(sizeof(struct scan_state), 104 M_80211_SCAN, M_NOWAIT | M_ZERO); 105 if (ss == NULL) { 106 ic->ic_scan = NULL; 107 return; 108 } 109 callout_init_mtx(&ss->ss_scan_timer, IEEE80211_LOCK_OBJ(ic), 0); 110 ic->ic_scan = &ss->base; 111 112 ic->ic_scan_curchan = scan_curchan; 113 ic->ic_scan_mindwell = scan_mindwell; 114} 115 116void 117ieee80211_scan_detach(struct ieee80211com *ic) 118{ 119 struct ieee80211_scan_state *ss = ic->ic_scan; 120 121 if (ss != NULL) { 122 callout_drain(&SCAN_PRIVATE(ss)->ss_scan_timer); 123 if (ss->ss_ops != NULL) { 124 ss->ss_ops->scan_detach(ss); 125 ss->ss_ops = NULL; 126 } 127 ic->ic_flags &= ~IEEE80211_F_SCAN; 128 ic->ic_scan = NULL; 129 free(SCAN_PRIVATE(ss), M_80211_SCAN); 130 } 131} 132 133static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = { 134 [IEEE80211_MODE_11A] = { .rssi = ROAM_RSSI_11A_DEFAULT, 135 .rate = ROAM_RATE_11A_DEFAULT }, 136 [IEEE80211_MODE_11G] = { .rssi = ROAM_RSSI_11B_DEFAULT, 137 .rate = ROAM_RATE_11B_DEFAULT }, 138 [IEEE80211_MODE_11B] = { .rssi = ROAM_RSSI_11BONLY_DEFAULT, 139 .rate = ROAM_RATE_11BONLY_DEFAULT }, 140 [IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT, 141 .rate = ROAM_RATE_11A_DEFAULT }, 142 [IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT, 143 .rate = ROAM_RATE_11A_DEFAULT }, 144 [IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT, 145 .rate = ROAM_RATE_11A_DEFAULT }, 146 [IEEE80211_MODE_HALF] = { .rssi = ROAM_RSSI_11A_DEFAULT, 147 .rate = ROAM_RATE_HALF_DEFAULT }, 148 [IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT, 149 .rate = ROAM_RATE_QUARTER_DEFAULT }, 150 [IEEE80211_MODE_11NA] = { .rssi = ROAM_RSSI_11A_DEFAULT, 151 .rate = ROAM_MCS_11N_DEFAULT }, 152 [IEEE80211_MODE_11NG] = { .rssi = ROAM_RSSI_11B_DEFAULT, 153 .rate = ROAM_MCS_11N_DEFAULT }, 154}; 155 156void 157ieee80211_scan_vattach(struct ieee80211vap *vap) 158{ 159 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz; 160 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz; 161 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz; 162 163 vap->iv_roaming = IEEE80211_ROAMING_AUTO; 164 memcpy(vap->iv_roamparms, defroam, sizeof(defroam)); 165} 166 167void 168ieee80211_scan_vdetach(struct ieee80211vap *vap) 169{ 170 struct ieee80211com *ic = vap->iv_ic; 171 struct ieee80211_scan_state *ss; 172 173 IEEE80211_LOCK(ic); 174 ss = ic->ic_scan; 175 if (ss != NULL && ss->ss_vap == vap) { 176 if (ic->ic_flags & IEEE80211_F_SCAN) { 177 /* XXX callout_drain */ 178 callout_stop(&SCAN_PRIVATE(ss)->ss_scan_timer); 179 ic->ic_flags &= ~IEEE80211_F_SCAN; 180 } 181 if (ss->ss_ops != NULL) { 182 ss->ss_ops->scan_detach(ss); 183 ss->ss_ops = NULL; 184 } 185 ss->ss_vap = NULL; 186 } 187 IEEE80211_UNLOCK(ic); 188} 189 190/* 191 * Simple-minded scanner module support. 192 */ 193static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 194 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 195 "wlan_scan_sta", /* IEEE80211_M_STA */ 196 "wlan_scan_wds", /* IEEE80211_M_WDS */ 197 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 198 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 199 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 200}; 201static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 202 203const struct ieee80211_scanner * 204ieee80211_scanner_get(enum ieee80211_opmode mode) 205{ 206 if (mode >= IEEE80211_OPMODE_MAX) 207 return NULL; 208 if (scanners[mode] == NULL) 209 ieee80211_load_module(scan_modnames[mode]); 210 return scanners[mode]; 211} 212 213void 214ieee80211_scanner_register(enum ieee80211_opmode mode, 215 const struct ieee80211_scanner *scan) 216{ 217 if (mode >= IEEE80211_OPMODE_MAX) 218 return; 219 scanners[mode] = scan; 220} 221 222void 223ieee80211_scanner_unregister(enum ieee80211_opmode mode, 224 const struct ieee80211_scanner *scan) 225{ 226 if (mode >= IEEE80211_OPMODE_MAX) 227 return; 228 if (scanners[mode] == scan) 229 scanners[mode] = NULL; 230} 231 232void 233ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 234{ 235 int m; 236 237 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 238 if (scanners[m] == scan) 239 scanners[m] = NULL; 240} 241 242/* 243 * Update common scanner state to reflect the current 244 * operating mode. This is called when the state machine 245 * is transitioned to RUN state w/o scanning--e.g. when 246 * operating in monitor mode. The purpose of this is to 247 * ensure later callbacks find ss_ops set to properly 248 * reflect current operating mode. 249 */ 250static void 251scan_update_locked(struct ieee80211vap *vap, 252 const struct ieee80211_scanner *scan) 253{ 254 struct ieee80211com *ic = vap->iv_ic; 255 struct ieee80211_scan_state *ss = ic->ic_scan; 256 257 IEEE80211_LOCK_ASSERT(ic); 258 259#ifdef IEEE80211_DEBUG 260 if (ss->ss_vap != vap || ss->ss_ops != scan) { 261 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 262 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 263 __func__, 264 ss->ss_vap != NULL ? 265 ss->ss_vap->iv_ifp->if_xname : "none", 266 ss->ss_vap != NULL ? 267 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 268 vap->iv_ifp->if_xname, 269 ieee80211_opmode_name[vap->iv_opmode]); 270 } 271#endif 272 ss->ss_vap = vap; 273 if (ss->ss_ops != scan) { 274 /* 275 * Switch scanners; detach old, attach new. Special 276 * case where a single scan module implements multiple 277 * policies by using different scan ops but a common 278 * core. We assume if the old and new attach methods 279 * are identical then it's ok to just change ss_ops 280 * and not flush the internal state of the module. 281 */ 282 if (scan == NULL || ss->ss_ops == NULL || 283 ss->ss_ops->scan_attach != scan->scan_attach) { 284 if (ss->ss_ops != NULL) 285 ss->ss_ops->scan_detach(ss); 286 if (scan != NULL && !scan->scan_attach(ss)) { 287 /* XXX attach failure */ 288 /* XXX stat+msg */ 289 scan = NULL; 290 } 291 } 292 ss->ss_ops = scan; 293 } 294} 295 296static void 297change_channel(struct ieee80211com *ic, 298 struct ieee80211_channel *chan) 299{ 300 ic->ic_curchan = chan; 301 ic->ic_set_channel(ic); 302} 303 304static char 305channel_type(const struct ieee80211_channel *c) 306{ 307 if (IEEE80211_IS_CHAN_ST(c)) 308 return 'S'; 309 if (IEEE80211_IS_CHAN_108A(c)) 310 return 'T'; 311 if (IEEE80211_IS_CHAN_108G(c)) 312 return 'G'; 313 if (IEEE80211_IS_CHAN_HT(c)) 314 return 'n'; 315 if (IEEE80211_IS_CHAN_A(c)) 316 return 'a'; 317 if (IEEE80211_IS_CHAN_ANYG(c)) 318 return 'g'; 319 if (IEEE80211_IS_CHAN_B(c)) 320 return 'b'; 321 return 'f'; 322} 323 324void 325ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 326{ 327 struct ieee80211com *ic = ss->ss_vap->iv_ic; 328 const char *sep; 329 int i; 330 331 sep = ""; 332 for (i = ss->ss_next; i < ss->ss_last; i++) { 333 const struct ieee80211_channel *c = ss->ss_chans[i]; 334 335 printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 336 channel_type(c)); 337 sep = ", "; 338 } 339} 340 341#ifdef IEEE80211_DEBUG 342static void 343scan_dump(struct ieee80211_scan_state *ss) 344{ 345 struct ieee80211vap *vap = ss->ss_vap; 346 347 if_printf(vap->iv_ifp, "scan set "); 348 ieee80211_scan_dump_channels(ss); 349 printf(" dwell min %lums max %lums\n", 350 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 351} 352#endif /* IEEE80211_DEBUG */ 353 354/* 355 * Enable station power save mode and start/restart the scanning thread. 356 */ 357static void 358scan_restart_pwrsav(void *arg) 359{ 360 struct scan_state *ss = (struct scan_state *) arg; 361 struct ieee80211vap *vap = ss->base.ss_vap; 362 struct ieee80211com *ic = vap->iv_ic; 363 int ticksdelay; 364 365 ieee80211_sta_pwrsave(vap, 1); 366 /* 367 * Use an initial 1ms delay so the null 368 * data frame has a chance to go out. 369 * XXX 1ms is a lot, better to trigger scan 370 * on tx complete. 371 */ 372 ticksdelay = msecs_to_ticks(1); 373 if (ticksdelay < 1) 374 ticksdelay = 1; 375 ic->ic_scan_start(ic); /* notify driver */ 376 ss->ss_scanend = ticks + ticksdelay + ss->ss_duration; 377 ss->ss_iflags |= ISCAN_START; 378 callout_reset(&ss->ss_scan_timer, ticksdelay, scan_next, ss); 379} 380 381/* 382 * Start/restart scanning. If we're operating in station mode 383 * and associated notify the ap we're going into power save mode 384 * and schedule a callback to initiate the work (where there's a 385 * better context for doing the work). Otherwise, start the scan 386 * directly. 387 */ 388static int 389scan_restart(struct scan_state *ss, u_int duration) 390{ 391 struct ieee80211vap *vap = ss->base.ss_vap; 392 struct ieee80211com *ic = vap->iv_ic; 393 int defer = 0; 394 395 if (ss->base.ss_next == ss->base.ss_last) { 396 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 397 "%s: no channels to scan\n", __func__); 398 return 0; 399 } 400 if (vap->iv_opmode == IEEE80211_M_STA && 401 vap->iv_state == IEEE80211_S_RUN) { 402 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) { 403 /* 404 * Initiate power save before going off-channel. 405 * Note that we cannot do this directly because 406 * of locking issues; instead we defer it to a 407 * tasklet. 408 */ 409 ss->ss_duration = duration; 410 defer = 1; 411 } 412 } 413 414 if (!defer) { 415 ic->ic_scan_start(ic); /* notify driver */ 416 ss->ss_scanend = ticks + duration; 417 ss->ss_iflags |= ISCAN_START; 418 callout_reset(&ss->ss_scan_timer, 0, scan_next, ss); 419 } else 420 scan_restart_pwrsav(ss); 421 return 1; 422} 423 424static void 425copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 426 int nssid, const struct ieee80211_scan_ssid ssids[]) 427{ 428 if (nssid > IEEE80211_SCAN_MAX_SSID) { 429 /* XXX printf */ 430 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 431 "%s: too many ssid %d, ignoring all of them\n", 432 __func__, nssid); 433 return; 434 } 435 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 436 ss->ss_nssid = nssid; 437} 438 439/* 440 * Start a scan unless one is already going. 441 */ 442static int 443start_scan_locked(const struct ieee80211_scanner *scan, 444 struct ieee80211vap *vap, int flags, u_int duration, 445 u_int mindwell, u_int maxdwell, 446 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 447{ 448 struct ieee80211com *ic = vap->iv_ic; 449 struct ieee80211_scan_state *ss = ic->ic_scan; 450 451 IEEE80211_LOCK_ASSERT(ic); 452 453 if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 454 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 455 "%s: scan inhibited by pending channel change\n", __func__); 456 } else if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 457 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 458 "%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n" 459 , __func__ 460 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 461 , duration, mindwell, maxdwell 462 , ieee80211_phymode_name[vap->iv_des_mode] 463 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 464 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 465 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 466 , flags & IEEE80211_SCAN_NOBCAST ? ", nobcast" : "" 467 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 468 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 469 ); 470 471 scan_update_locked(vap, scan); 472 if (ss->ss_ops != NULL) { 473 if ((flags & IEEE80211_SCAN_NOSSID) == 0) 474 copy_ssid(vap, ss, nssid, ssids); 475 476 /* NB: top 4 bits for internal use */ 477 ss->ss_flags = flags & 0xfff; 478 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 479 vap->iv_stats.is_scan_active++; 480 else 481 vap->iv_stats.is_scan_passive++; 482 if (flags & IEEE80211_SCAN_FLUSH) 483 ss->ss_ops->scan_flush(ss); 484 485 /* NB: flush frames rx'd before 1st channel change */ 486 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 487 ss->ss_next = 0; 488 ss->ss_mindwell = mindwell; 489 ss->ss_maxdwell = maxdwell; 490 ss->ss_ops->scan_start(ss, vap); 491#ifdef IEEE80211_DEBUG 492 if (ieee80211_msg_scan(vap)) 493 scan_dump(ss); 494#endif /* IEEE80211_DEBUG */ 495 if (scan_restart(SCAN_PRIVATE(ss), duration)) 496 ic->ic_flags |= IEEE80211_F_SCAN; 497 } 498 } else { 499 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 500 "%s: %s scan already in progress\n", __func__, 501 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 502 } 503 return (ic->ic_flags & IEEE80211_F_SCAN); 504} 505 506/* 507 * Start a scan unless one is already going. 508 */ 509int 510ieee80211_start_scan(struct ieee80211vap *vap, int flags, 511 u_int duration, u_int mindwell, u_int maxdwell, 512 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 513{ 514 struct ieee80211com *ic = vap->iv_ic; 515 const struct ieee80211_scanner *scan; 516 int result; 517 518 scan = ieee80211_scanner_get(vap->iv_opmode); 519 if (scan == NULL) { 520 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 521 "%s: no scanner support for %s mode\n", 522 __func__, ieee80211_opmode_name[vap->iv_opmode]); 523 /* XXX stat */ 524 return 0; 525 } 526 527 IEEE80211_LOCK(ic); 528 result = start_scan_locked(scan, vap, flags, duration, 529 mindwell, maxdwell, nssid, ssids); 530 IEEE80211_UNLOCK(ic); 531 532 return result; 533} 534 535/* 536 * Check the scan cache for an ap/channel to use; if that 537 * fails then kick off a new scan. 538 */ 539int 540ieee80211_check_scan(struct ieee80211vap *vap, int flags, 541 u_int duration, u_int mindwell, u_int maxdwell, 542 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 543{ 544 struct ieee80211com *ic = vap->iv_ic; 545 struct ieee80211_scan_state *ss = ic->ic_scan; 546 const struct ieee80211_scanner *scan; 547 int result; 548 549 scan = ieee80211_scanner_get(vap->iv_opmode); 550 if (scan == NULL) { 551 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 552 "%s: no scanner support for %s mode\n", 553 __func__, vap->iv_opmode); 554 /* XXX stat */ 555 return 0; 556 } 557 558 /* 559 * Check if there's a list of scan candidates already. 560 * XXX want more than the ap we're currently associated with 561 */ 562 563 IEEE80211_LOCK(ic); 564 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 565 "%s: %s scan, %s%s%s%s%s\n" 566 , __func__ 567 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 568 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 569 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 570 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 571 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 572 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 573 ); 574 575 if (ss->ss_ops != scan) { 576 /* XXX re-use cache contents? e.g. adhoc<->sta */ 577 flags |= IEEE80211_SCAN_FLUSH; 578 } 579 scan_update_locked(vap, scan); 580 if (ss->ss_ops != NULL) { 581 /* XXX verify ss_ops matches vap->iv_opmode */ 582 if ((flags & IEEE80211_SCAN_NOSSID) == 0) { 583 /* 584 * Update the ssid list and mark flags so if 585 * we call start_scan it doesn't duplicate work. 586 */ 587 copy_ssid(vap, ss, nssid, ssids); 588 flags |= IEEE80211_SCAN_NOSSID; 589 } 590 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 591 (flags & IEEE80211_SCAN_FLUSH) == 0 && 592 time_before(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 593 /* 594 * We're not currently scanning and the cache is 595 * deemed hot enough to consult. Lock out others 596 * by marking IEEE80211_F_SCAN while we decide if 597 * something is already in the scan cache we can 598 * use. Also discard any frames that might come 599 * in while temporarily marked as scanning. 600 */ 601 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 602 ic->ic_flags |= IEEE80211_F_SCAN; 603 604 /* NB: need to use supplied flags in check */ 605 ss->ss_flags = flags & 0xff; 606 result = ss->ss_ops->scan_end(ss, vap); 607 608 ic->ic_flags &= ~IEEE80211_F_SCAN; 609 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD; 610 if (result) { 611 ieee80211_notify_scan_done(vap); 612 IEEE80211_UNLOCK(ic); 613 return 1; 614 } 615 } 616 } 617 result = start_scan_locked(scan, vap, flags, duration, 618 mindwell, maxdwell, nssid, ssids); 619 IEEE80211_UNLOCK(ic); 620 621 return result; 622} 623 624/* 625 * Check the scan cache for an ap/channel to use; if that fails 626 * then kick off a scan using the current settings. 627 */ 628int 629ieee80211_check_scan_current(struct ieee80211vap *vap) 630{ 631 return ieee80211_check_scan(vap, 632 IEEE80211_SCAN_ACTIVE, 633 IEEE80211_SCAN_FOREVER, 0, 0, 634 vap->iv_des_nssid, vap->iv_des_ssid); 635} 636 637/* 638 * Restart a previous scan. If the previous scan completed 639 * then we start again using the existing channel list. 640 */ 641int 642ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 643{ 644 struct ieee80211com *ic = vap->iv_ic; 645 struct ieee80211_scan_state *ss = ic->ic_scan; 646 const struct ieee80211_scanner *scan; 647 648 scan = ieee80211_scanner_get(vap->iv_opmode); 649 if (scan == NULL) { 650 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 651 "%s: no scanner support for %s mode\n", 652 __func__, vap->iv_opmode); 653 /* XXX stat */ 654 return 0; 655 } 656 657 IEEE80211_LOCK(ic); 658 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 659 u_int duration; 660 /* 661 * Go off-channel for a fixed interval that is large 662 * enough to catch most ap's but short enough that 663 * we can return on-channel before our listen interval 664 * expires. 665 */ 666 duration = IEEE80211_SCAN_OFFCHANNEL; 667 668 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 669 "%s: %s scan, ticks %u duration %lu\n", __func__, 670 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive", 671 ticks, duration); 672 673 scan_update_locked(vap, scan); 674 if (ss->ss_ops != NULL) { 675 ss->ss_vap = vap; 676 /* 677 * A background scan does not select a new sta; it 678 * just refreshes the scan cache. Also, indicate 679 * the scan logic should follow the beacon schedule: 680 * we go off-channel and scan for a while, then 681 * return to the bss channel to receive a beacon, 682 * then go off-channel again. All during this time 683 * we notify the ap we're in power save mode. When 684 * the scan is complete we leave power save mode. 685 * If any beacon indicates there are frames pending 686 * for us then we drop out of power save mode 687 * (and background scan) automatically by way of the 688 * usual sta power save logic. 689 */ 690 ss->ss_flags |= IEEE80211_SCAN_NOPICK 691 | IEEE80211_SCAN_BGSCAN 692 | flags 693 ; 694 /* if previous scan completed, restart */ 695 if (ss->ss_next >= ss->ss_last) { 696 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 697 vap->iv_stats.is_scan_active++; 698 else 699 vap->iv_stats.is_scan_passive++; 700 /* 701 * NB: beware of the scan cache being flushed; 702 * if the channel list is empty use the 703 * scan_start method to populate it. 704 */ 705 ss->ss_next = 0; 706 if (ss->ss_last != 0) 707 ss->ss_ops->scan_restart(ss, vap); 708 else { 709 ss->ss_ops->scan_start(ss, vap); 710#ifdef IEEE80211_DEBUG 711 if (ieee80211_msg_scan(vap)) 712 scan_dump(ss); 713#endif /* IEEE80211_DEBUG */ 714 } 715 } 716 /* NB: flush frames rx'd before 1st channel change */ 717 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 718 ss->ss_maxdwell = duration; 719 if (scan_restart(SCAN_PRIVATE(ss), duration)) { 720 ic->ic_flags |= IEEE80211_F_SCAN; 721 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN; 722 } 723 } else { 724 /* XXX msg+stat */ 725 } 726 } else { 727 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 728 "%s: %s scan already in progress\n", __func__, 729 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 730 } 731 IEEE80211_UNLOCK(ic); 732 733 /* NB: racey, does it matter? */ 734 return (ic->ic_flags & IEEE80211_F_SCAN); 735} 736 737/* 738 * Cancel any scan currently going on for the specified vap. 739 */ 740void 741ieee80211_cancel_scan(struct ieee80211vap *vap) 742{ 743 struct ieee80211com *ic = vap->iv_ic; 744 struct ieee80211_scan_state *ss = ic->ic_scan; 745 746 IEEE80211_LOCK(ic); 747 if ((ic->ic_flags & IEEE80211_F_SCAN) && 748 ss->ss_vap == vap && 749 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 750 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 751 "%s: cancel %s scan\n", __func__, 752 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 753 "active" : "passive"); 754 755 /* clear bg scan NOPICK and mark cancel request */ 756 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 757 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 758 /* force it to fire asap */ 759 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 760 0, scan_next, ss); 761 } 762 IEEE80211_UNLOCK(ic); 763} 764 765/* 766 * Cancel any scan currently going on. 767 */ 768void 769ieee80211_cancel_anyscan(struct ieee80211vap *vap) 770{ 771 struct ieee80211com *ic = vap->iv_ic; 772 struct ieee80211_scan_state *ss = ic->ic_scan; 773 774 IEEE80211_LOCK(ic); 775 if ((ic->ic_flags & IEEE80211_F_SCAN) && 776 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 777 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 778 "%s: cancel %s scan\n", __func__, 779 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 780 "active" : "passive"); 781 782 /* clear bg scan NOPICK and mark cancel request */ 783 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 784 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 785 /* force it to fire asap */ 786 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 787 0, scan_next, ss); 788 } 789 IEEE80211_UNLOCK(ic); 790} 791 792/* 793 * Public access to scan_next for drivers that manage 794 * scanning themselves (e.g. for firmware-based devices). 795 */ 796void 797ieee80211_scan_next(struct ieee80211vap *vap) 798{ 799 struct ieee80211com *ic = vap->iv_ic; 800 struct ieee80211_scan_state *ss = ic->ic_scan; 801 802 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 0, scan_next, ss); 803} 804 805/* 806 * Public access to scan_next for drivers that are not able to scan single 807 * channels (e.g. for firmware-based devices). 808 */ 809void 810ieee80211_scan_done(struct ieee80211vap *vap) 811{ 812 struct ieee80211com *ic = vap->iv_ic; 813 struct ieee80211_scan_state *ss; 814 815 IEEE80211_LOCK(ic); 816 ss = ic->ic_scan; 817 ss->ss_next = ss->ss_last; /* all channels are complete */ 818 scan_next(ss); 819 IEEE80211_UNLOCK(ic); 820} 821 822/* 823 * Probe the curent channel, if allowed, while scanning. 824 * If the channel is not marked passive-only then send 825 * a probe request immediately. Otherwise mark state and 826 * listen for beacons on the channel; if we receive something 827 * then we'll transmit a probe request. 828 */ 829void 830ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 831{ 832 struct ieee80211com *ic = vap->iv_ic; 833 struct ieee80211_scan_state *ss = ic->ic_scan; 834 struct ifnet *ifp = vap->iv_ifp; 835 int i; 836 837 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 838 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 839 return; 840 } 841 /* 842 * Send directed probe requests followed by any 843 * broadcast probe request. 844 * XXX remove dependence on ic/vap->iv_bss 845 */ 846 for (i = 0; i < ss->ss_nssid; i++) 847 ieee80211_send_probereq(vap->iv_bss, 848 vap->iv_myaddr, ifp->if_broadcastaddr, 849 ifp->if_broadcastaddr, 850 ss->ss_ssid[i].ssid, ss->ss_ssid[i].len); 851 if ((ss->ss_flags & IEEE80211_SCAN_NOBCAST) == 0) 852 ieee80211_send_probereq(vap->iv_bss, 853 vap->iv_myaddr, ifp->if_broadcastaddr, 854 ifp->if_broadcastaddr, 855 "", 0); 856} 857 858/* 859 * Scan curchan. If this is an active scan and the channel 860 * is not marked passive then send probe request frame(s). 861 * Arrange for the channel change after maxdwell ticks. 862 */ 863static void 864scan_curchan(struct ieee80211_scan_state *ss, unsigned long maxdwell) 865{ 866 struct ieee80211vap *vap = ss->ss_vap; 867 868 IEEE80211_LOCK_ASSERT(vap->iv_ic); 869 870 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 871 ieee80211_probe_curchan(vap, 0); 872 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 873 maxdwell, scan_next, ss); 874} 875 876/* 877 * Handle mindwell requirements completed; initiate a channel 878 * change to the next channel asap. 879 */ 880static void 881scan_mindwell(struct ieee80211_scan_state *ss) 882{ 883 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 0, scan_next, ss); 884} 885 886/* 887 * Switch to the next channel marked for scanning. 888 */ 889static void 890scan_next(void *arg) 891{ 892#define ISCAN_REP (ISCAN_MINDWELL | ISCAN_START | ISCAN_DISCARD) 893 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 894 struct ieee80211vap *vap = ss->ss_vap; 895 struct ieee80211com *ic = vap->iv_ic; 896 struct ieee80211_channel *chan; 897 unsigned long maxdwell, scanend; 898 int scandone; 899 900 IEEE80211_LOCK_ASSERT(ic); 901 902 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) 903 return; 904again: 905 scandone = (ss->ss_next >= ss->ss_last) || 906 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0; 907 scanend = SCAN_PRIVATE(ss)->ss_scanend; 908 if (!scandone && 909 (ss->ss_flags & IEEE80211_SCAN_GOTPICK) == 0 && 910 ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_START) || 911 time_before(ticks + ss->ss_mindwell, scanend))) { 912 chan = ss->ss_chans[ss->ss_next++]; 913 914 /* 915 * Watch for truncation due to the scan end time. 916 */ 917 if (time_after(ticks + ss->ss_maxdwell, scanend)) 918 maxdwell = scanend - ticks; 919 else 920 maxdwell = ss->ss_maxdwell; 921 922 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 923 "%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n", 924 __func__, 925 ieee80211_chan2ieee(ic, ic->ic_curchan), 926 channel_type(ic->ic_curchan), 927 ieee80211_chan2ieee(ic, chan), channel_type(chan), 928 (ss->ss_flags & IEEE80211_SCAN_ACTIVE) && 929 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ? 930 "active" : "passive", 931 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell)); 932 933 /* 934 * Potentially change channel and phy mode. 935 */ 936 change_channel(ic, chan); 937 938 /* 939 * Scan curchan. Drivers for "intelligent hardware" 940 * override ic_scan_curchan to tell the device to do 941 * the work. Otherwise we manage the work outselves; 942 * sending a probe request (as needed), and arming the 943 * timeout to switch channels after maxdwell ticks. 944 */ 945 ic->ic_scan_curchan(ss, maxdwell); 946 947 SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell; 948 /* clear mindwell lock and initial channel change flush */ 949 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 950 } else { 951 ic->ic_scan_end(ic); /* notify driver */ 952 /* 953 * Record scan complete time. Note that we also do 954 * this when canceled so any background scan will 955 * not be restarted for a while. 956 */ 957 if (scandone) 958 ic->ic_lastscan = ticks; 959 /* return to the bss channel */ 960 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 961 ic->ic_curchan != ic->ic_bsschan) 962 ieee80211_setcurchan(ic, ic->ic_bsschan); 963 /* clear internal flags and any indication of a pick */ 964 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 965 ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK; 966 967 /* 968 * If not canceled and scan completed, do post-processing. 969 * If the callback function returns 0, then it wants to 970 * continue/restart scanning. Unfortunately we needed to 971 * notify the driver to end the scan above to avoid having 972 * rx frames alter the scan candidate list. 973 */ 974 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 && 975 !ss->ss_ops->scan_end(ss, vap) && 976 (ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 && 977 time_before(ticks + ss->ss_mindwell, scanend)) { 978 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 979 "%s: done, restart " 980 "[ticks %u, dwell min %lu scanend %lu]\n", 981 __func__, 982 ticks, ss->ss_mindwell, scanend); 983 ss->ss_next = 0; /* reset to begining */ 984 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 985 vap->iv_stats.is_scan_active++; 986 else 987 vap->iv_stats.is_scan_passive++; 988 989 ss->ss_ops->scan_restart(ss, vap); /* XXX? */ 990 ic->ic_scan_start(ic); /* notify driver */ 991 goto again; 992 } else { 993 /* past here, scandone is ``true'' if not in bg mode */ 994 if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0) 995 scandone = 1; 996 997 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 998 "%s: %s, " 999 "[ticks %u, dwell min %lu scanend %lu]\n", 1000 __func__, scandone ? "done" : "stopped", 1001 ticks, ss->ss_mindwell, scanend); 1002 1003 /* 1004 * Clear the SCAN bit first in case frames are 1005 * pending on the station power save queue. If 1006 * we defer this then the dispatch of the frames 1007 * may generate a request to cancel scanning. 1008 */ 1009 ic->ic_flags &= ~IEEE80211_F_SCAN; 1010 /* 1011 * Drop out of power save mode when a scan has 1012 * completed. If this scan was prematurely terminated 1013 * because it is a background scan then don't notify 1014 * the ap; we'll either return to scanning after we 1015 * receive the beacon frame or we'll drop out of power 1016 * save mode because the beacon indicates we have frames 1017 * waiting for us. 1018 */ 1019 if (scandone) { 1020 ieee80211_sta_pwrsave(vap, 0); 1021 if (ss->ss_next >= ss->ss_last) { 1022 ieee80211_notify_scan_done(vap); 1023 ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN; 1024 } 1025 } 1026 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_CANCEL; 1027 ss->ss_flags &= 1028 ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST); 1029 } 1030 } 1031#undef ISCAN_REP 1032} 1033 1034#ifdef IEEE80211_DEBUG 1035static void 1036dump_country(const uint8_t *ie) 1037{ 1038 const struct ieee80211_country_ie *cie = 1039 (const struct ieee80211_country_ie *) ie; 1040 int i, nbands, schan, nchan; 1041 1042 if (cie->len < 3) { 1043 printf(" <bogus country ie, len %d>", cie->len); 1044 return; 1045 } 1046 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 1047 nbands = (cie->len - 3) / sizeof(cie->band[0]); 1048 for (i = 0; i < nbands; i++) { 1049 schan = cie->band[i].schan; 1050 nchan = cie->band[i].nchan; 1051 if (nchan != 1) 1052 printf(" %u-%u,%u", schan, schan + nchan-1, 1053 cie->band[i].maxtxpwr); 1054 else 1055 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 1056 } 1057 printf("]"); 1058} 1059 1060static void 1061dump_probe_beacon(uint8_t subtype, int isnew, 1062 const uint8_t mac[IEEE80211_ADDR_LEN], 1063 const struct ieee80211_scanparams *sp, int rssi) 1064{ 1065 1066 printf("[%s] %s%s on chan %u (bss chan %u) ", 1067 ether_sprintf(mac), isnew ? "new " : "", 1068 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], 1069 sp->chan, sp->bchan); 1070 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 1071 printf(" rssi %d\n", rssi); 1072 1073 if (isnew) { 1074 printf("[%s] caps 0x%x bintval %u erp 0x%x", 1075 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 1076 if (sp->country != NULL) 1077 dump_country(sp->country); 1078 printf("\n"); 1079 } 1080} 1081#endif /* IEEE80211_DEBUG */ 1082 1083/* 1084 * Process a beacon or probe response frame. 1085 */ 1086void 1087ieee80211_add_scan(struct ieee80211vap *vap, 1088 const struct ieee80211_scanparams *sp, 1089 const struct ieee80211_frame *wh, 1090 int subtype, int rssi, int noise, int rstamp) 1091{ 1092 struct ieee80211com *ic = vap->iv_ic; 1093 struct ieee80211_scan_state *ss = ic->ic_scan; 1094 1095 /* XXX locking */ 1096 /* 1097 * Frames received during startup are discarded to avoid 1098 * using scan state setup on the initial entry to the timer 1099 * callback. This can occur because the device may enable 1100 * rx prior to our doing the initial channel change in the 1101 * timer routine. 1102 */ 1103 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD) 1104 return; 1105#ifdef IEEE80211_DEBUG 1106 if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN)) 1107 dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi); 1108#endif 1109 if (ss->ss_ops != NULL && 1110 ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise, rstamp)) { 1111 /* 1112 * If we've reached the min dwell time terminate 1113 * the timer so we'll switch to the next channel. 1114 */ 1115 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 && 1116 time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) { 1117 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1118 "%s: chan %3d%c min dwell met (%u > %lu)\n", 1119 __func__, 1120 ieee80211_chan2ieee(ic, ic->ic_curchan), 1121 channel_type(ic->ic_curchan), 1122 ticks, SCAN_PRIVATE(ss)->ss_chanmindwell); 1123 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL; 1124 /* 1125 * NB: trigger at next clock tick or wait for the 1126 * hardware. 1127 */ 1128 ic->ic_scan_mindwell(ss); 1129 } 1130 } 1131} 1132 1133/* 1134 * Timeout/age scan cache entries; called from sta timeout 1135 * timer (XXX should be self-contained). 1136 */ 1137void 1138ieee80211_scan_timeout(struct ieee80211com *ic) 1139{ 1140 struct ieee80211_scan_state *ss = ic->ic_scan; 1141 1142 if (ss->ss_ops != NULL) 1143 ss->ss_ops->scan_age(ss); 1144} 1145 1146/* 1147 * Mark a scan cache entry after a successful associate. 1148 */ 1149void 1150ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 1151{ 1152 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1153 1154 if (ss->ss_ops != NULL) { 1155 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 1156 mac, "%s", __func__); 1157 ss->ss_ops->scan_assoc_success(ss, mac); 1158 } 1159} 1160 1161/* 1162 * Demerit a scan cache entry after failing to associate. 1163 */ 1164void 1165ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 1166 const uint8_t mac[], int reason) 1167{ 1168 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1169 1170 if (ss->ss_ops != NULL) { 1171 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 1172 "%s: reason %u", __func__, reason); 1173 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 1174 } 1175} 1176 1177/* 1178 * Iterate over the contents of the scan cache. 1179 */ 1180void 1181ieee80211_scan_iterate(struct ieee80211vap *vap, 1182 ieee80211_scan_iter_func *f, void *arg) 1183{ 1184 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1185 1186 if (ss->ss_ops != NULL) 1187 ss->ss_ops->scan_iterate(ss, f, arg); 1188} 1189 1190/* 1191 * Flush the contents of the scan cache. 1192 */ 1193void 1194ieee80211_scan_flush(struct ieee80211vap *vap) 1195{ 1196 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1197 1198 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 1199 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 1200 ss->ss_ops->scan_flush(ss); 1201 } 1202} 1203 1204/* 1205 * Check the scan cache for an ap/channel to use; if that 1206 * fails then kick off a new scan. 1207 */ 1208struct ieee80211_channel * 1209ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 1210{ 1211 struct ieee80211_scan_state *ss = ic->ic_scan; 1212 1213 IEEE80211_LOCK_ASSERT(ic); 1214 1215 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 1216 /* XXX printf? */ 1217 return NULL; 1218 } 1219 if (ss->ss_ops->scan_pickchan == NULL) { 1220 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 1221 "%s: scan module does not support picking a channel, " 1222 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 1223 return NULL; 1224 } 1225 return ss->ss_ops->scan_pickchan(ss, flags); 1226} 1227