ieee80211_scan_sw.c revision 190532
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 190532 2009-03-29 21:17:08Z 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_rt = ieee80211_get_ratetable(chan); 302 ic->ic_set_channel(ic); 303} 304 305static char 306channel_type(const struct ieee80211_channel *c) 307{ 308 if (IEEE80211_IS_CHAN_ST(c)) 309 return 'S'; 310 if (IEEE80211_IS_CHAN_108A(c)) 311 return 'T'; 312 if (IEEE80211_IS_CHAN_108G(c)) 313 return 'G'; 314 if (IEEE80211_IS_CHAN_HT(c)) 315 return 'n'; 316 if (IEEE80211_IS_CHAN_A(c)) 317 return 'a'; 318 if (IEEE80211_IS_CHAN_ANYG(c)) 319 return 'g'; 320 if (IEEE80211_IS_CHAN_B(c)) 321 return 'b'; 322 return 'f'; 323} 324 325void 326ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 327{ 328 struct ieee80211com *ic = ss->ss_vap->iv_ic; 329 const char *sep; 330 int i; 331 332 sep = ""; 333 for (i = ss->ss_next; i < ss->ss_last; i++) { 334 const struct ieee80211_channel *c = ss->ss_chans[i]; 335 336 printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 337 channel_type(c)); 338 sep = ", "; 339 } 340} 341 342#ifdef IEEE80211_DEBUG 343static void 344scan_dump(struct ieee80211_scan_state *ss) 345{ 346 struct ieee80211vap *vap = ss->ss_vap; 347 348 if_printf(vap->iv_ifp, "scan set "); 349 ieee80211_scan_dump_channels(ss); 350 printf(" dwell min %lums max %lums\n", 351 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 352} 353#endif /* IEEE80211_DEBUG */ 354 355/* 356 * Enable station power save mode and start/restart the scanning thread. 357 */ 358static void 359scan_restart_pwrsav(void *arg) 360{ 361 struct scan_state *ss = (struct scan_state *) arg; 362 struct ieee80211vap *vap = ss->base.ss_vap; 363 struct ieee80211com *ic = vap->iv_ic; 364 int ticksdelay; 365 366 ieee80211_sta_pwrsave(vap, 1); 367 /* 368 * Use an initial 1ms delay so the null 369 * data frame has a chance to go out. 370 * XXX 1ms is a lot, better to trigger scan 371 * on tx complete. 372 */ 373 ticksdelay = msecs_to_ticks(1); 374 if (ticksdelay < 1) 375 ticksdelay = 1; 376 ic->ic_scan_start(ic); /* notify driver */ 377 ss->ss_scanend = ticks + ticksdelay + ss->ss_duration; 378 ss->ss_iflags |= ISCAN_START; 379 callout_reset(&ss->ss_scan_timer, ticksdelay, scan_next, ss); 380} 381 382/* 383 * Start/restart scanning. If we're operating in station mode 384 * and associated notify the ap we're going into power save mode 385 * and schedule a callback to initiate the work (where there's a 386 * better context for doing the work). Otherwise, start the scan 387 * directly. 388 */ 389static int 390scan_restart(struct scan_state *ss, u_int duration) 391{ 392 struct ieee80211vap *vap = ss->base.ss_vap; 393 struct ieee80211com *ic = vap->iv_ic; 394 int defer = 0; 395 396 if (ss->base.ss_next == ss->base.ss_last) { 397 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 398 "%s: no channels to scan\n", __func__); 399 return 0; 400 } 401 if (vap->iv_opmode == IEEE80211_M_STA && 402 vap->iv_state == IEEE80211_S_RUN) { 403 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) { 404 /* 405 * Initiate power save before going off-channel. 406 * Note that we cannot do this directly because 407 * of locking issues; instead we defer it to a 408 * tasklet. 409 */ 410 ss->ss_duration = duration; 411 defer = 1; 412 } 413 } 414 415 if (!defer) { 416 ic->ic_scan_start(ic); /* notify driver */ 417 ss->ss_scanend = ticks + duration; 418 ss->ss_iflags |= ISCAN_START; 419 callout_reset(&ss->ss_scan_timer, 0, scan_next, ss); 420 } else 421 scan_restart_pwrsav(ss); 422 return 1; 423} 424 425static void 426copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 427 int nssid, const struct ieee80211_scan_ssid ssids[]) 428{ 429 if (nssid > IEEE80211_SCAN_MAX_SSID) { 430 /* XXX printf */ 431 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 432 "%s: too many ssid %d, ignoring all of them\n", 433 __func__, nssid); 434 return; 435 } 436 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 437 ss->ss_nssid = nssid; 438} 439 440/* 441 * Start a scan unless one is already going. 442 */ 443static int 444start_scan_locked(const struct ieee80211_scanner *scan, 445 struct ieee80211vap *vap, int flags, u_int duration, 446 u_int mindwell, u_int maxdwell, 447 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 448{ 449 struct ieee80211com *ic = vap->iv_ic; 450 struct ieee80211_scan_state *ss = ic->ic_scan; 451 452 IEEE80211_LOCK_ASSERT(ic); 453 454 if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 455 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 456 "%s: scan inhibited by pending channel change\n", __func__); 457 } else if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 458 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 459 "%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n" 460 , __func__ 461 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 462 , duration, mindwell, maxdwell 463 , ieee80211_phymode_name[vap->iv_des_mode] 464 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 465 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 466 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 467 , flags & IEEE80211_SCAN_NOBCAST ? ", nobcast" : "" 468 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 469 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 470 ); 471 472 scan_update_locked(vap, scan); 473 if (ss->ss_ops != NULL) { 474 if ((flags & IEEE80211_SCAN_NOSSID) == 0) 475 copy_ssid(vap, ss, nssid, ssids); 476 477 /* NB: top 4 bits for internal use */ 478 ss->ss_flags = flags & 0xfff; 479 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 480 vap->iv_stats.is_scan_active++; 481 else 482 vap->iv_stats.is_scan_passive++; 483 if (flags & IEEE80211_SCAN_FLUSH) 484 ss->ss_ops->scan_flush(ss); 485 486 /* NB: flush frames rx'd before 1st channel change */ 487 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 488 ss->ss_next = 0; 489 ss->ss_mindwell = mindwell; 490 ss->ss_maxdwell = maxdwell; 491 ss->ss_ops->scan_start(ss, vap); 492#ifdef IEEE80211_DEBUG 493 if (ieee80211_msg_scan(vap)) 494 scan_dump(ss); 495#endif /* IEEE80211_DEBUG */ 496 if (scan_restart(SCAN_PRIVATE(ss), duration)) 497 ic->ic_flags |= IEEE80211_F_SCAN; 498 } 499 } else { 500 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 501 "%s: %s scan already in progress\n", __func__, 502 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 503 } 504 return (ic->ic_flags & IEEE80211_F_SCAN); 505} 506 507/* 508 * Start a scan unless one is already going. 509 */ 510int 511ieee80211_start_scan(struct ieee80211vap *vap, int flags, 512 u_int duration, u_int mindwell, u_int maxdwell, 513 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 514{ 515 struct ieee80211com *ic = vap->iv_ic; 516 const struct ieee80211_scanner *scan; 517 int result; 518 519 scan = ieee80211_scanner_get(vap->iv_opmode); 520 if (scan == NULL) { 521 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 522 "%s: no scanner support for %s mode\n", 523 __func__, ieee80211_opmode_name[vap->iv_opmode]); 524 /* XXX stat */ 525 return 0; 526 } 527 528 IEEE80211_LOCK(ic); 529 result = start_scan_locked(scan, vap, flags, duration, 530 mindwell, maxdwell, nssid, ssids); 531 IEEE80211_UNLOCK(ic); 532 533 return result; 534} 535 536/* 537 * Check the scan cache for an ap/channel to use; if that 538 * fails then kick off a new scan. 539 */ 540int 541ieee80211_check_scan(struct ieee80211vap *vap, int flags, 542 u_int duration, u_int mindwell, u_int maxdwell, 543 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 544{ 545 struct ieee80211com *ic = vap->iv_ic; 546 struct ieee80211_scan_state *ss = ic->ic_scan; 547 const struct ieee80211_scanner *scan; 548 int result; 549 550 scan = ieee80211_scanner_get(vap->iv_opmode); 551 if (scan == NULL) { 552 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 553 "%s: no scanner support for %s mode\n", 554 __func__, vap->iv_opmode); 555 /* XXX stat */ 556 return 0; 557 } 558 559 /* 560 * Check if there's a list of scan candidates already. 561 * XXX want more than the ap we're currently associated with 562 */ 563 564 IEEE80211_LOCK(ic); 565 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 566 "%s: %s scan, %s%s%s%s%s\n" 567 , __func__ 568 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 569 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 570 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 571 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 572 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 573 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 574 ); 575 576 if (ss->ss_ops != scan) { 577 /* XXX re-use cache contents? e.g. adhoc<->sta */ 578 flags |= IEEE80211_SCAN_FLUSH; 579 } 580 scan_update_locked(vap, scan); 581 if (ss->ss_ops != NULL) { 582 /* XXX verify ss_ops matches vap->iv_opmode */ 583 if ((flags & IEEE80211_SCAN_NOSSID) == 0) { 584 /* 585 * Update the ssid list and mark flags so if 586 * we call start_scan it doesn't duplicate work. 587 */ 588 copy_ssid(vap, ss, nssid, ssids); 589 flags |= IEEE80211_SCAN_NOSSID; 590 } 591 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 592 (flags & IEEE80211_SCAN_FLUSH) == 0 && 593 time_before(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 594 /* 595 * We're not currently scanning and the cache is 596 * deemed hot enough to consult. Lock out others 597 * by marking IEEE80211_F_SCAN while we decide if 598 * something is already in the scan cache we can 599 * use. Also discard any frames that might come 600 * in while temporarily marked as scanning. 601 */ 602 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 603 ic->ic_flags |= IEEE80211_F_SCAN; 604 605 /* NB: need to use supplied flags in check */ 606 ss->ss_flags = flags & 0xff; 607 result = ss->ss_ops->scan_end(ss, vap); 608 609 ic->ic_flags &= ~IEEE80211_F_SCAN; 610 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD; 611 if (result) { 612 ieee80211_notify_scan_done(vap); 613 IEEE80211_UNLOCK(ic); 614 return 1; 615 } 616 } 617 } 618 result = start_scan_locked(scan, vap, flags, duration, 619 mindwell, maxdwell, nssid, ssids); 620 IEEE80211_UNLOCK(ic); 621 622 return result; 623} 624 625/* 626 * Check the scan cache for an ap/channel to use; if that fails 627 * then kick off a scan using the current settings. 628 */ 629int 630ieee80211_check_scan_current(struct ieee80211vap *vap) 631{ 632 return ieee80211_check_scan(vap, 633 IEEE80211_SCAN_ACTIVE, 634 IEEE80211_SCAN_FOREVER, 0, 0, 635 vap->iv_des_nssid, vap->iv_des_ssid); 636} 637 638/* 639 * Restart a previous scan. If the previous scan completed 640 * then we start again using the existing channel list. 641 */ 642int 643ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 644{ 645 struct ieee80211com *ic = vap->iv_ic; 646 struct ieee80211_scan_state *ss = ic->ic_scan; 647 const struct ieee80211_scanner *scan; 648 649 scan = ieee80211_scanner_get(vap->iv_opmode); 650 if (scan == NULL) { 651 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 652 "%s: no scanner support for %s mode\n", 653 __func__, vap->iv_opmode); 654 /* XXX stat */ 655 return 0; 656 } 657 658 IEEE80211_LOCK(ic); 659 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 660 u_int duration; 661 /* 662 * Go off-channel for a fixed interval that is large 663 * enough to catch most ap's but short enough that 664 * we can return on-channel before our listen interval 665 * expires. 666 */ 667 duration = IEEE80211_SCAN_OFFCHANNEL; 668 669 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 670 "%s: %s scan, ticks %u duration %lu\n", __func__, 671 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive", 672 ticks, duration); 673 674 scan_update_locked(vap, scan); 675 if (ss->ss_ops != NULL) { 676 ss->ss_vap = vap; 677 /* 678 * A background scan does not select a new sta; it 679 * just refreshes the scan cache. Also, indicate 680 * the scan logic should follow the beacon schedule: 681 * we go off-channel and scan for a while, then 682 * return to the bss channel to receive a beacon, 683 * then go off-channel again. All during this time 684 * we notify the ap we're in power save mode. When 685 * the scan is complete we leave power save mode. 686 * If any beacon indicates there are frames pending 687 * for us then we drop out of power save mode 688 * (and background scan) automatically by way of the 689 * usual sta power save logic. 690 */ 691 ss->ss_flags |= IEEE80211_SCAN_NOPICK 692 | IEEE80211_SCAN_BGSCAN 693 | flags 694 ; 695 /* if previous scan completed, restart */ 696 if (ss->ss_next >= ss->ss_last) { 697 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 698 vap->iv_stats.is_scan_active++; 699 else 700 vap->iv_stats.is_scan_passive++; 701 /* 702 * NB: beware of the scan cache being flushed; 703 * if the channel list is empty use the 704 * scan_start method to populate it. 705 */ 706 ss->ss_next = 0; 707 if (ss->ss_last != 0) 708 ss->ss_ops->scan_restart(ss, vap); 709 else { 710 ss->ss_ops->scan_start(ss, vap); 711#ifdef IEEE80211_DEBUG 712 if (ieee80211_msg_scan(vap)) 713 scan_dump(ss); 714#endif /* IEEE80211_DEBUG */ 715 } 716 } 717 /* NB: flush frames rx'd before 1st channel change */ 718 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 719 ss->ss_maxdwell = duration; 720 if (scan_restart(SCAN_PRIVATE(ss), duration)) { 721 ic->ic_flags |= IEEE80211_F_SCAN; 722 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN; 723 } 724 } else { 725 /* XXX msg+stat */ 726 } 727 } else { 728 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 729 "%s: %s scan already in progress\n", __func__, 730 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 731 } 732 IEEE80211_UNLOCK(ic); 733 734 /* NB: racey, does it matter? */ 735 return (ic->ic_flags & IEEE80211_F_SCAN); 736} 737 738/* 739 * Cancel any scan currently going on for the specified vap. 740 */ 741void 742ieee80211_cancel_scan(struct ieee80211vap *vap) 743{ 744 struct ieee80211com *ic = vap->iv_ic; 745 struct ieee80211_scan_state *ss = ic->ic_scan; 746 747 IEEE80211_LOCK(ic); 748 if ((ic->ic_flags & IEEE80211_F_SCAN) && 749 ss->ss_vap == vap && 750 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 751 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 752 "%s: cancel %s scan\n", __func__, 753 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 754 "active" : "passive"); 755 756 /* clear bg scan NOPICK and mark cancel request */ 757 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 758 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 759 /* force it to fire asap */ 760 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 761 0, scan_next, ss); 762 } 763 IEEE80211_UNLOCK(ic); 764} 765 766/* 767 * Cancel any scan currently going on. 768 */ 769void 770ieee80211_cancel_anyscan(struct ieee80211vap *vap) 771{ 772 struct ieee80211com *ic = vap->iv_ic; 773 struct ieee80211_scan_state *ss = ic->ic_scan; 774 775 IEEE80211_LOCK(ic); 776 if ((ic->ic_flags & IEEE80211_F_SCAN) && 777 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 778 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 779 "%s: cancel %s scan\n", __func__, 780 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 781 "active" : "passive"); 782 783 /* clear bg scan NOPICK and mark cancel request */ 784 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 785 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 786 /* force it to fire asap */ 787 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 788 0, scan_next, ss); 789 } 790 IEEE80211_UNLOCK(ic); 791} 792 793/* 794 * Public access to scan_next for drivers that manage 795 * scanning themselves (e.g. for firmware-based devices). 796 */ 797void 798ieee80211_scan_next(struct ieee80211vap *vap) 799{ 800 struct ieee80211com *ic = vap->iv_ic; 801 struct ieee80211_scan_state *ss = ic->ic_scan; 802 803 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 0, scan_next, ss); 804} 805 806/* 807 * Public access to scan_next for drivers that are not able to scan single 808 * channels (e.g. for firmware-based devices). 809 */ 810void 811ieee80211_scan_done(struct ieee80211vap *vap) 812{ 813 struct ieee80211com *ic = vap->iv_ic; 814 struct ieee80211_scan_state *ss; 815 816 IEEE80211_LOCK(ic); 817 ss = ic->ic_scan; 818 ss->ss_next = ss->ss_last; /* all channels are complete */ 819 scan_next(ss); 820 IEEE80211_UNLOCK(ic); 821} 822 823/* 824 * Probe the curent channel, if allowed, while scanning. 825 * If the channel is not marked passive-only then send 826 * a probe request immediately. Otherwise mark state and 827 * listen for beacons on the channel; if we receive something 828 * then we'll transmit a probe request. 829 */ 830void 831ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 832{ 833 struct ieee80211com *ic = vap->iv_ic; 834 struct ieee80211_scan_state *ss = ic->ic_scan; 835 struct ifnet *ifp = vap->iv_ifp; 836 int i; 837 838 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 839 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 840 return; 841 } 842 /* 843 * Send directed probe requests followed by any 844 * broadcast probe request. 845 * XXX remove dependence on ic/vap->iv_bss 846 */ 847 for (i = 0; i < ss->ss_nssid; i++) 848 ieee80211_send_probereq(vap->iv_bss, 849 vap->iv_myaddr, ifp->if_broadcastaddr, 850 ifp->if_broadcastaddr, 851 ss->ss_ssid[i].ssid, ss->ss_ssid[i].len); 852 if ((ss->ss_flags & IEEE80211_SCAN_NOBCAST) == 0) 853 ieee80211_send_probereq(vap->iv_bss, 854 vap->iv_myaddr, ifp->if_broadcastaddr, 855 ifp->if_broadcastaddr, 856 "", 0); 857} 858 859/* 860 * Scan curchan. If this is an active scan and the channel 861 * is not marked passive then send probe request frame(s). 862 * Arrange for the channel change after maxdwell ticks. 863 */ 864static void 865scan_curchan(struct ieee80211_scan_state *ss, unsigned long maxdwell) 866{ 867 struct ieee80211vap *vap = ss->ss_vap; 868 869 IEEE80211_LOCK_ASSERT(vap->iv_ic); 870 871 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 872 ieee80211_probe_curchan(vap, 0); 873 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 874 maxdwell, scan_next, ss); 875} 876 877/* 878 * Handle mindwell requirements completed; initiate a channel 879 * change to the next channel asap. 880 */ 881static void 882scan_mindwell(struct ieee80211_scan_state *ss) 883{ 884 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 0, scan_next, ss); 885} 886 887/* 888 * Switch to the next channel marked for scanning. 889 */ 890static void 891scan_next(void *arg) 892{ 893#define ISCAN_REP (ISCAN_MINDWELL | ISCAN_START | ISCAN_DISCARD) 894 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 895 struct ieee80211vap *vap = ss->ss_vap; 896 struct ieee80211com *ic = vap->iv_ic; 897 struct ieee80211_channel *chan; 898 unsigned long maxdwell, scanend; 899 int scandone; 900 901 IEEE80211_LOCK_ASSERT(ic); 902 903 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) 904 return; 905again: 906 scandone = (ss->ss_next >= ss->ss_last) || 907 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0; 908 scanend = SCAN_PRIVATE(ss)->ss_scanend; 909 if (!scandone && 910 (ss->ss_flags & IEEE80211_SCAN_GOTPICK) == 0 && 911 ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_START) || 912 time_before(ticks + ss->ss_mindwell, scanend))) { 913 chan = ss->ss_chans[ss->ss_next++]; 914 915 /* 916 * Watch for truncation due to the scan end time. 917 */ 918 if (time_after(ticks + ss->ss_maxdwell, scanend)) 919 maxdwell = scanend - ticks; 920 else 921 maxdwell = ss->ss_maxdwell; 922 923 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 924 "%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n", 925 __func__, 926 ieee80211_chan2ieee(ic, ic->ic_curchan), 927 channel_type(ic->ic_curchan), 928 ieee80211_chan2ieee(ic, chan), channel_type(chan), 929 (ss->ss_flags & IEEE80211_SCAN_ACTIVE) && 930 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ? 931 "active" : "passive", 932 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell)); 933 934 /* 935 * Potentially change channel and phy mode. 936 */ 937 change_channel(ic, chan); 938 939 /* 940 * Scan curchan. Drivers for "intelligent hardware" 941 * override ic_scan_curchan to tell the device to do 942 * the work. Otherwise we manage the work outselves; 943 * sending a probe request (as needed), and arming the 944 * timeout to switch channels after maxdwell ticks. 945 */ 946 ic->ic_scan_curchan(ss, maxdwell); 947 948 SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell; 949 /* clear mindwell lock and initial channel change flush */ 950 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 951 } else { 952 ic->ic_scan_end(ic); /* notify driver */ 953 /* 954 * Record scan complete time. Note that we also do 955 * this when canceled so any background scan will 956 * not be restarted for a while. 957 */ 958 if (scandone) 959 ic->ic_lastscan = ticks; 960 /* return to the bss channel */ 961 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 962 ic->ic_curchan != ic->ic_bsschan) 963 ieee80211_setcurchan(ic, ic->ic_bsschan); 964 /* clear internal flags and any indication of a pick */ 965 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 966 ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK; 967 968 /* 969 * If not canceled and scan completed, do post-processing. 970 * If the callback function returns 0, then it wants to 971 * continue/restart scanning. Unfortunately we needed to 972 * notify the driver to end the scan above to avoid having 973 * rx frames alter the scan candidate list. 974 */ 975 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 && 976 !ss->ss_ops->scan_end(ss, vap) && 977 (ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 && 978 time_before(ticks + ss->ss_mindwell, scanend)) { 979 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 980 "%s: done, restart " 981 "[ticks %u, dwell min %lu scanend %lu]\n", 982 __func__, 983 ticks, ss->ss_mindwell, scanend); 984 ss->ss_next = 0; /* reset to begining */ 985 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 986 vap->iv_stats.is_scan_active++; 987 else 988 vap->iv_stats.is_scan_passive++; 989 990 ss->ss_ops->scan_restart(ss, vap); /* XXX? */ 991 ic->ic_scan_start(ic); /* notify driver */ 992 goto again; 993 } else { 994 /* past here, scandone is ``true'' if not in bg mode */ 995 if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0) 996 scandone = 1; 997 998 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 999 "%s: %s, " 1000 "[ticks %u, dwell min %lu scanend %lu]\n", 1001 __func__, scandone ? "done" : "stopped", 1002 ticks, ss->ss_mindwell, scanend); 1003 1004 /* 1005 * Clear the SCAN bit first in case frames are 1006 * pending on the station power save queue. If 1007 * we defer this then the dispatch of the frames 1008 * may generate a request to cancel scanning. 1009 */ 1010 ic->ic_flags &= ~IEEE80211_F_SCAN; 1011 /* 1012 * Drop out of power save mode when a scan has 1013 * completed. If this scan was prematurely terminated 1014 * because it is a background scan then don't notify 1015 * the ap; we'll either return to scanning after we 1016 * receive the beacon frame or we'll drop out of power 1017 * save mode because the beacon indicates we have frames 1018 * waiting for us. 1019 */ 1020 if (scandone) { 1021 ieee80211_sta_pwrsave(vap, 0); 1022 if (ss->ss_next >= ss->ss_last) { 1023 ieee80211_notify_scan_done(vap); 1024 ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN; 1025 } 1026 } 1027 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_CANCEL; 1028 ss->ss_flags &= 1029 ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST); 1030 } 1031 } 1032#undef ISCAN_REP 1033} 1034 1035#ifdef IEEE80211_DEBUG 1036static void 1037dump_country(const uint8_t *ie) 1038{ 1039 const struct ieee80211_country_ie *cie = 1040 (const struct ieee80211_country_ie *) ie; 1041 int i, nbands, schan, nchan; 1042 1043 if (cie->len < 3) { 1044 printf(" <bogus country ie, len %d>", cie->len); 1045 return; 1046 } 1047 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 1048 nbands = (cie->len - 3) / sizeof(cie->band[0]); 1049 for (i = 0; i < nbands; i++) { 1050 schan = cie->band[i].schan; 1051 nchan = cie->band[i].nchan; 1052 if (nchan != 1) 1053 printf(" %u-%u,%u", schan, schan + nchan-1, 1054 cie->band[i].maxtxpwr); 1055 else 1056 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 1057 } 1058 printf("]"); 1059} 1060 1061static void 1062dump_probe_beacon(uint8_t subtype, int isnew, 1063 const uint8_t mac[IEEE80211_ADDR_LEN], 1064 const struct ieee80211_scanparams *sp, int rssi) 1065{ 1066 1067 printf("[%s] %s%s on chan %u (bss chan %u) ", 1068 ether_sprintf(mac), isnew ? "new " : "", 1069 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], 1070 sp->chan, sp->bchan); 1071 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 1072 printf(" rssi %d\n", rssi); 1073 1074 if (isnew) { 1075 printf("[%s] caps 0x%x bintval %u erp 0x%x", 1076 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 1077 if (sp->country != NULL) 1078 dump_country(sp->country); 1079 printf("\n"); 1080 } 1081} 1082#endif /* IEEE80211_DEBUG */ 1083 1084/* 1085 * Process a beacon or probe response frame. 1086 */ 1087void 1088ieee80211_add_scan(struct ieee80211vap *vap, 1089 const struct ieee80211_scanparams *sp, 1090 const struct ieee80211_frame *wh, 1091 int subtype, int rssi, int noise, int rstamp) 1092{ 1093 struct ieee80211com *ic = vap->iv_ic; 1094 struct ieee80211_scan_state *ss = ic->ic_scan; 1095 1096 /* XXX locking */ 1097 /* 1098 * Frames received during startup are discarded to avoid 1099 * using scan state setup on the initial entry to the timer 1100 * callback. This can occur because the device may enable 1101 * rx prior to our doing the initial channel change in the 1102 * timer routine. 1103 */ 1104 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD) 1105 return; 1106#ifdef IEEE80211_DEBUG 1107 if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN)) 1108 dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi); 1109#endif 1110 if (ss->ss_ops != NULL && 1111 ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise, rstamp)) { 1112 /* 1113 * If we've reached the min dwell time terminate 1114 * the timer so we'll switch to the next channel. 1115 */ 1116 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 && 1117 time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) { 1118 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1119 "%s: chan %3d%c min dwell met (%u > %lu)\n", 1120 __func__, 1121 ieee80211_chan2ieee(ic, ic->ic_curchan), 1122 channel_type(ic->ic_curchan), 1123 ticks, SCAN_PRIVATE(ss)->ss_chanmindwell); 1124 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL; 1125 /* 1126 * NB: trigger at next clock tick or wait for the 1127 * hardware. 1128 */ 1129 ic->ic_scan_mindwell(ss); 1130 } 1131 } 1132} 1133 1134/* 1135 * Timeout/age scan cache entries; called from sta timeout 1136 * timer (XXX should be self-contained). 1137 */ 1138void 1139ieee80211_scan_timeout(struct ieee80211com *ic) 1140{ 1141 struct ieee80211_scan_state *ss = ic->ic_scan; 1142 1143 if (ss->ss_ops != NULL) 1144 ss->ss_ops->scan_age(ss); 1145} 1146 1147/* 1148 * Mark a scan cache entry after a successful associate. 1149 */ 1150void 1151ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 1152{ 1153 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1154 1155 if (ss->ss_ops != NULL) { 1156 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 1157 mac, "%s", __func__); 1158 ss->ss_ops->scan_assoc_success(ss, mac); 1159 } 1160} 1161 1162/* 1163 * Demerit a scan cache entry after failing to associate. 1164 */ 1165void 1166ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 1167 const uint8_t mac[], int reason) 1168{ 1169 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1170 1171 if (ss->ss_ops != NULL) { 1172 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 1173 "%s: reason %u", __func__, reason); 1174 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 1175 } 1176} 1177 1178/* 1179 * Iterate over the contents of the scan cache. 1180 */ 1181void 1182ieee80211_scan_iterate(struct ieee80211vap *vap, 1183 ieee80211_scan_iter_func *f, void *arg) 1184{ 1185 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1186 1187 if (ss->ss_ops != NULL) 1188 ss->ss_ops->scan_iterate(ss, f, arg); 1189} 1190 1191/* 1192 * Flush the contents of the scan cache. 1193 */ 1194void 1195ieee80211_scan_flush(struct ieee80211vap *vap) 1196{ 1197 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1198 1199 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 1200 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 1201 ss->ss_ops->scan_flush(ss); 1202 } 1203} 1204 1205/* 1206 * Check the scan cache for an ap/channel to use; if that 1207 * fails then kick off a new scan. 1208 */ 1209struct ieee80211_channel * 1210ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 1211{ 1212 struct ieee80211_scan_state *ss = ic->ic_scan; 1213 1214 IEEE80211_LOCK_ASSERT(ic); 1215 1216 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 1217 /* XXX printf? */ 1218 return NULL; 1219 } 1220 if (ss->ss_ops->scan_pickchan == NULL) { 1221 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 1222 "%s: scan module does not support picking a channel, " 1223 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 1224 return NULL; 1225 } 1226 return ss->ss_ops->scan_pickchan(ss, flags); 1227} 1228