ieee80211_scan.c revision 192468
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 192468 2009-05-20 20:00:40Z 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/proc.h> 37#include <sys/kernel.h> 38#include <sys/condvar.h> 39 40#include <sys/socket.h> 41 42#include <net/if.h> 43#include <net/if_media.h> 44#include <net/ethernet.h> 45 46#include <net80211/ieee80211_var.h> 47 48#include <net/bpf.h> 49 50struct scan_state { 51 struct ieee80211_scan_state base; /* public state */ 52 53 u_int ss_iflags; /* flags used internally */ 54#define ISCAN_MINDWELL 0x0001 /* min dwell time reached */ 55#define ISCAN_DISCARD 0x0002 /* discard rx'd frames */ 56#define ISCAN_CANCEL 0x0004 /* cancel current scan */ 57#define ISCAN_ABORT 0x0008 /* end the scan immediately */ 58 unsigned long ss_chanmindwell; /* min dwell on curchan */ 59 unsigned long ss_scanend; /* time scan must stop */ 60 u_int ss_duration; /* duration for next scan */ 61 struct task ss_scan_task; /* scan execution */ 62 struct cv ss_scan_cv; /* scan signal */ 63 struct callout ss_scan_timer; /* scan timer */ 64}; 65#define SCAN_PRIVATE(ss) ((struct scan_state *) ss) 66 67/* 68 * Amount of time to go off-channel during a background 69 * scan. This value should be large enough to catch most 70 * ap's but short enough that we can return on-channel 71 * before our listen interval expires. 72 * 73 * XXX tunable 74 * XXX check against configured listen interval 75 */ 76#define IEEE80211_SCAN_OFFCHANNEL msecs_to_ticks(150) 77 78/* 79 * Roaming-related defaults. RSSI thresholds are as returned by the 80 * driver (.5dBm). Transmit rate thresholds are IEEE rate codes (i.e 81 * .5M units) or MCS. 82 */ 83/* rssi thresholds */ 84#define ROAM_RSSI_11A_DEFAULT 14 /* 11a bss */ 85#define ROAM_RSSI_11B_DEFAULT 14 /* 11b bss */ 86#define ROAM_RSSI_11BONLY_DEFAULT 14 /* 11b-only bss */ 87/* transmit rate thresholds */ 88#define ROAM_RATE_11A_DEFAULT 2*12 /* 11a bss */ 89#define ROAM_RATE_11B_DEFAULT 2*5 /* 11b bss */ 90#define ROAM_RATE_11BONLY_DEFAULT 2*1 /* 11b-only bss */ 91#define ROAM_RATE_HALF_DEFAULT 2*6 /* half-width 11a/g bss */ 92#define ROAM_RATE_QUARTER_DEFAULT 2*3 /* quarter-width 11a/g bss */ 93#define ROAM_MCS_11N_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11n bss */ 94 95static void scan_curchan(struct ieee80211_scan_state *, unsigned long); 96static void scan_mindwell(struct ieee80211_scan_state *); 97static void scan_signal(void *); 98static void scan_task(void *, int); 99 100MALLOC_DEFINE(M_80211_SCAN, "80211scan", "802.11 scan state"); 101 102void 103ieee80211_scan_attach(struct ieee80211com *ic) 104{ 105 struct scan_state *ss; 106 107 ss = (struct scan_state *) malloc(sizeof(struct scan_state), 108 M_80211_SCAN, M_NOWAIT | M_ZERO); 109 if (ss == NULL) { 110 ic->ic_scan = NULL; 111 return; 112 } 113 callout_init_mtx(&ss->ss_scan_timer, IEEE80211_LOCK_OBJ(ic), 0); 114 cv_init(&ss->ss_scan_cv, "scan"); 115 TASK_INIT(&ss->ss_scan_task, 0, scan_task, ss); 116 ic->ic_scan = &ss->base; 117 ss->base.ss_ic = ic; 118 119 ic->ic_scan_curchan = scan_curchan; 120 ic->ic_scan_mindwell = scan_mindwell; 121} 122 123void 124ieee80211_scan_detach(struct ieee80211com *ic) 125{ 126 struct ieee80211_scan_state *ss = ic->ic_scan; 127 128 if (ss != NULL) { 129 IEEE80211_LOCK(ic); 130 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT; 131 scan_signal(ss); 132 IEEE80211_UNLOCK(ic); 133 ieee80211_draintask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 134 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, 135 ("scan still running")); 136 if (ss->ss_ops != NULL) { 137 ss->ss_ops->scan_detach(ss); 138 ss->ss_ops = NULL; 139 } 140 ic->ic_scan = NULL; 141 free(SCAN_PRIVATE(ss), M_80211_SCAN); 142 } 143} 144 145static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = { 146 [IEEE80211_MODE_11A] = { .rssi = ROAM_RSSI_11A_DEFAULT, 147 .rate = ROAM_RATE_11A_DEFAULT }, 148 [IEEE80211_MODE_11G] = { .rssi = ROAM_RSSI_11B_DEFAULT, 149 .rate = ROAM_RATE_11B_DEFAULT }, 150 [IEEE80211_MODE_11B] = { .rssi = ROAM_RSSI_11BONLY_DEFAULT, 151 .rate = ROAM_RATE_11BONLY_DEFAULT }, 152 [IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT, 153 .rate = ROAM_RATE_11A_DEFAULT }, 154 [IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT, 155 .rate = ROAM_RATE_11A_DEFAULT }, 156 [IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT, 157 .rate = ROAM_RATE_11A_DEFAULT }, 158 [IEEE80211_MODE_HALF] = { .rssi = ROAM_RSSI_11A_DEFAULT, 159 .rate = ROAM_RATE_HALF_DEFAULT }, 160 [IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT, 161 .rate = ROAM_RATE_QUARTER_DEFAULT }, 162 [IEEE80211_MODE_11NA] = { .rssi = ROAM_RSSI_11A_DEFAULT, 163 .rate = ROAM_MCS_11N_DEFAULT }, 164 [IEEE80211_MODE_11NG] = { .rssi = ROAM_RSSI_11B_DEFAULT, 165 .rate = ROAM_MCS_11N_DEFAULT }, 166}; 167 168void 169ieee80211_scan_vattach(struct ieee80211vap *vap) 170{ 171 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz; 172 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz; 173 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz; 174 175 vap->iv_roaming = IEEE80211_ROAMING_AUTO; 176 memcpy(vap->iv_roamparms, defroam, sizeof(defroam)); 177} 178 179void 180ieee80211_scan_vdetach(struct ieee80211vap *vap) 181{ 182 struct ieee80211com *ic = vap->iv_ic; 183 struct ieee80211_scan_state *ss; 184 185 IEEE80211_LOCK(ic); 186 ss = ic->ic_scan; 187 if (ss != NULL && ss->ss_vap == vap) { 188 if (ic->ic_flags & IEEE80211_F_SCAN) { 189 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT; 190 scan_signal(ss); 191 } 192 if (ss->ss_ops != NULL) { 193 ss->ss_ops->scan_detach(ss); 194 ss->ss_ops = NULL; 195 } 196 ss->ss_vap = NULL; 197 } 198 IEEE80211_UNLOCK(ic); 199} 200 201/* 202 * Simple-minded scanner module support. 203 */ 204static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 205 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 206 "wlan_scan_sta", /* IEEE80211_M_STA */ 207 "wlan_scan_wds", /* IEEE80211_M_WDS */ 208 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 209 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 210 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 211}; 212static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 213 214const struct ieee80211_scanner * 215ieee80211_scanner_get(enum ieee80211_opmode mode) 216{ 217 if (mode >= IEEE80211_OPMODE_MAX) 218 return NULL; 219 if (scanners[mode] == NULL) 220 ieee80211_load_module(scan_modnames[mode]); 221 return scanners[mode]; 222} 223 224void 225ieee80211_scanner_register(enum ieee80211_opmode mode, 226 const struct ieee80211_scanner *scan) 227{ 228 if (mode >= IEEE80211_OPMODE_MAX) 229 return; 230 scanners[mode] = scan; 231} 232 233void 234ieee80211_scanner_unregister(enum ieee80211_opmode mode, 235 const struct ieee80211_scanner *scan) 236{ 237 if (mode >= IEEE80211_OPMODE_MAX) 238 return; 239 if (scanners[mode] == scan) 240 scanners[mode] = NULL; 241} 242 243void 244ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 245{ 246 int m; 247 248 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 249 if (scanners[m] == scan) 250 scanners[m] = NULL; 251} 252 253/* 254 * Update common scanner state to reflect the current 255 * operating mode. This is called when the state machine 256 * is transitioned to RUN state w/o scanning--e.g. when 257 * operating in monitor mode. The purpose of this is to 258 * ensure later callbacks find ss_ops set to properly 259 * reflect current operating mode. 260 */ 261static void 262scan_update_locked(struct ieee80211vap *vap, 263 const struct ieee80211_scanner *scan) 264{ 265 struct ieee80211com *ic = vap->iv_ic; 266 struct ieee80211_scan_state *ss = ic->ic_scan; 267 268 IEEE80211_LOCK_ASSERT(ic); 269 270#ifdef IEEE80211_DEBUG 271 if (ss->ss_vap != vap || ss->ss_ops != scan) { 272 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 273 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 274 __func__, 275 ss->ss_vap != NULL ? 276 ss->ss_vap->iv_ifp->if_xname : "none", 277 ss->ss_vap != NULL ? 278 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 279 vap->iv_ifp->if_xname, 280 ieee80211_opmode_name[vap->iv_opmode]); 281 } 282#endif 283 ss->ss_vap = vap; 284 if (ss->ss_ops != scan) { 285 /* 286 * Switch scanners; detach old, attach new. Special 287 * case where a single scan module implements multiple 288 * policies by using different scan ops but a common 289 * core. We assume if the old and new attach methods 290 * are identical then it's ok to just change ss_ops 291 * and not flush the internal state of the module. 292 */ 293 if (scan == NULL || ss->ss_ops == NULL || 294 ss->ss_ops->scan_attach != scan->scan_attach) { 295 if (ss->ss_ops != NULL) 296 ss->ss_ops->scan_detach(ss); 297 if (scan != NULL && !scan->scan_attach(ss)) { 298 /* XXX attach failure */ 299 /* XXX stat+msg */ 300 scan = NULL; 301 } 302 } 303 ss->ss_ops = scan; 304 } 305} 306 307static char 308channel_type(const struct ieee80211_channel *c) 309{ 310 if (IEEE80211_IS_CHAN_ST(c)) 311 return 'S'; 312 if (IEEE80211_IS_CHAN_108A(c)) 313 return 'T'; 314 if (IEEE80211_IS_CHAN_108G(c)) 315 return 'G'; 316 if (IEEE80211_IS_CHAN_HT(c)) 317 return 'n'; 318 if (IEEE80211_IS_CHAN_A(c)) 319 return 'a'; 320 if (IEEE80211_IS_CHAN_ANYG(c)) 321 return 'g'; 322 if (IEEE80211_IS_CHAN_B(c)) 323 return 'b'; 324 return 'f'; 325} 326 327void 328ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 329{ 330 struct ieee80211com *ic = ss->ss_ic; 331 const char *sep; 332 int i; 333 334 sep = ""; 335 for (i = ss->ss_next; i < ss->ss_last; i++) { 336 const struct ieee80211_channel *c = ss->ss_chans[i]; 337 338 printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 339 channel_type(c)); 340 sep = ", "; 341 } 342} 343 344#ifdef IEEE80211_DEBUG 345static void 346scan_dump(struct ieee80211_scan_state *ss) 347{ 348 struct ieee80211vap *vap = ss->ss_vap; 349 350 if_printf(vap->iv_ifp, "scan set "); 351 ieee80211_scan_dump_channels(ss); 352 printf(" dwell min %lums max %lums\n", 353 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 354} 355#endif /* IEEE80211_DEBUG */ 356 357static void 358copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 359 int nssid, const struct ieee80211_scan_ssid ssids[]) 360{ 361 if (nssid > IEEE80211_SCAN_MAX_SSID) { 362 /* XXX printf */ 363 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 364 "%s: too many ssid %d, ignoring all of them\n", 365 __func__, nssid); 366 return; 367 } 368 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 369 ss->ss_nssid = nssid; 370} 371 372/* 373 * Start a scan unless one is already going. 374 */ 375static int 376start_scan_locked(const struct ieee80211_scanner *scan, 377 struct ieee80211vap *vap, int flags, u_int duration, 378 u_int mindwell, u_int maxdwell, 379 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 380{ 381 struct ieee80211com *ic = vap->iv_ic; 382 struct ieee80211_scan_state *ss = ic->ic_scan; 383 384 IEEE80211_LOCK_ASSERT(ic); 385 386 if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 387 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 388 "%s: scan inhibited by pending channel change\n", __func__); 389 } else if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 390 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 391 "%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n" 392 , __func__ 393 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 394 , duration, mindwell, maxdwell 395 , ieee80211_phymode_name[vap->iv_des_mode] 396 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 397 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 398 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 399 , flags & IEEE80211_SCAN_NOBCAST ? ", nobcast" : "" 400 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 401 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 402 ); 403 404 scan_update_locked(vap, scan); 405 if (ss->ss_ops != NULL) { 406 if ((flags & IEEE80211_SCAN_NOSSID) == 0) 407 copy_ssid(vap, ss, nssid, ssids); 408 409 /* NB: top 4 bits for internal use */ 410 ss->ss_flags = flags & 0xfff; 411 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 412 vap->iv_stats.is_scan_active++; 413 else 414 vap->iv_stats.is_scan_passive++; 415 if (flags & IEEE80211_SCAN_FLUSH) 416 ss->ss_ops->scan_flush(ss); 417 418 /* NB: flush frames rx'd before 1st channel change */ 419 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 420 SCAN_PRIVATE(ss)->ss_duration = duration; 421 ss->ss_next = 0; 422 ss->ss_mindwell = mindwell; 423 ss->ss_maxdwell = maxdwell; 424 /* NB: scan_start must be before the scan runtask */ 425 ss->ss_ops->scan_start(ss, vap); 426#ifdef IEEE80211_DEBUG 427 if (ieee80211_msg_scan(vap)) 428 scan_dump(ss); 429#endif /* IEEE80211_DEBUG */ 430 ic->ic_flags |= IEEE80211_F_SCAN; 431 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 432 } 433 } else { 434 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 435 "%s: %s scan already in progress\n", __func__, 436 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 437 } 438 return (ic->ic_flags & IEEE80211_F_SCAN); 439} 440 441/* 442 * Start a scan unless one is already going. 443 */ 444int 445ieee80211_start_scan(struct ieee80211vap *vap, int flags, 446 u_int duration, 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 const struct ieee80211_scanner *scan; 451 int result; 452 453 scan = ieee80211_scanner_get(vap->iv_opmode); 454 if (scan == NULL) { 455 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 456 "%s: no scanner support for %s mode\n", 457 __func__, ieee80211_opmode_name[vap->iv_opmode]); 458 /* XXX stat */ 459 return 0; 460 } 461 462 IEEE80211_LOCK(ic); 463 result = start_scan_locked(scan, vap, flags, duration, 464 mindwell, maxdwell, nssid, ssids); 465 IEEE80211_UNLOCK(ic); 466 467 return result; 468} 469 470/* 471 * Check the scan cache for an ap/channel to use; if that 472 * fails then kick off a new scan. 473 */ 474int 475ieee80211_check_scan(struct ieee80211vap *vap, int flags, 476 u_int duration, u_int mindwell, u_int maxdwell, 477 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 478{ 479 struct ieee80211com *ic = vap->iv_ic; 480 struct ieee80211_scan_state *ss = ic->ic_scan; 481 const struct ieee80211_scanner *scan; 482 int result; 483 484 scan = ieee80211_scanner_get(vap->iv_opmode); 485 if (scan == NULL) { 486 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 487 "%s: no scanner support for %s mode\n", 488 __func__, vap->iv_opmode); 489 /* XXX stat */ 490 return 0; 491 } 492 493 /* 494 * Check if there's a list of scan candidates already. 495 * XXX want more than the ap we're currently associated with 496 */ 497 498 IEEE80211_LOCK(ic); 499 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 500 "%s: %s scan, %s%s%s%s%s\n" 501 , __func__ 502 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 503 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 504 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 505 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 506 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 507 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 508 ); 509 510 if (ss->ss_ops != scan) { 511 /* XXX re-use cache contents? e.g. adhoc<->sta */ 512 flags |= IEEE80211_SCAN_FLUSH; 513 } 514 scan_update_locked(vap, scan); 515 if (ss->ss_ops != NULL) { 516 /* XXX verify ss_ops matches vap->iv_opmode */ 517 if ((flags & IEEE80211_SCAN_NOSSID) == 0) { 518 /* 519 * Update the ssid list and mark flags so if 520 * we call start_scan it doesn't duplicate work. 521 */ 522 copy_ssid(vap, ss, nssid, ssids); 523 flags |= IEEE80211_SCAN_NOSSID; 524 } 525 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 526 (flags & IEEE80211_SCAN_FLUSH) == 0 && 527 time_before(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 528 /* 529 * We're not currently scanning and the cache is 530 * deemed hot enough to consult. Lock out others 531 * by marking IEEE80211_F_SCAN while we decide if 532 * something is already in the scan cache we can 533 * use. Also discard any frames that might come 534 * in while temporarily marked as scanning. 535 */ 536 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 537 ic->ic_flags |= IEEE80211_F_SCAN; 538 539 /* NB: need to use supplied flags in check */ 540 ss->ss_flags = flags & 0xff; 541 result = ss->ss_ops->scan_end(ss, vap); 542 543 ic->ic_flags &= ~IEEE80211_F_SCAN; 544 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD; 545 if (result) { 546 ieee80211_notify_scan_done(vap); 547 IEEE80211_UNLOCK(ic); 548 return 1; 549 } 550 } 551 } 552 result = start_scan_locked(scan, vap, flags, duration, 553 mindwell, maxdwell, nssid, ssids); 554 IEEE80211_UNLOCK(ic); 555 556 return result; 557} 558 559/* 560 * Check the scan cache for an ap/channel to use; if that fails 561 * then kick off a scan using the current settings. 562 */ 563int 564ieee80211_check_scan_current(struct ieee80211vap *vap) 565{ 566 return ieee80211_check_scan(vap, 567 IEEE80211_SCAN_ACTIVE, 568 IEEE80211_SCAN_FOREVER, 0, 0, 569 vap->iv_des_nssid, vap->iv_des_ssid); 570} 571 572/* 573 * Restart a previous scan. If the previous scan completed 574 * then we start again using the existing channel list. 575 */ 576int 577ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 578{ 579 struct ieee80211com *ic = vap->iv_ic; 580 struct ieee80211_scan_state *ss = ic->ic_scan; 581 const struct ieee80211_scanner *scan; 582 583 scan = ieee80211_scanner_get(vap->iv_opmode); 584 if (scan == NULL) { 585 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 586 "%s: no scanner support for %s mode\n", 587 __func__, vap->iv_opmode); 588 /* XXX stat */ 589 return 0; 590 } 591 592 IEEE80211_LOCK(ic); 593 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 594 u_int duration; 595 /* 596 * Go off-channel for a fixed interval that is large 597 * enough to catch most ap's but short enough that 598 * we can return on-channel before our listen interval 599 * expires. 600 */ 601 duration = IEEE80211_SCAN_OFFCHANNEL; 602 603 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 604 "%s: %s scan, ticks %u duration %lu\n", __func__, 605 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive", 606 ticks, duration); 607 608 scan_update_locked(vap, scan); 609 if (ss->ss_ops != NULL) { 610 ss->ss_vap = vap; 611 /* 612 * A background scan does not select a new sta; it 613 * just refreshes the scan cache. Also, indicate 614 * the scan logic should follow the beacon schedule: 615 * we go off-channel and scan for a while, then 616 * return to the bss channel to receive a beacon, 617 * then go off-channel again. All during this time 618 * we notify the ap we're in power save mode. When 619 * the scan is complete we leave power save mode. 620 * If any beacon indicates there are frames pending 621 * for us then we drop out of power save mode 622 * (and background scan) automatically by way of the 623 * usual sta power save logic. 624 */ 625 ss->ss_flags |= IEEE80211_SCAN_NOPICK 626 | IEEE80211_SCAN_BGSCAN 627 | flags 628 ; 629 /* if previous scan completed, restart */ 630 if (ss->ss_next >= ss->ss_last) { 631 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 632 vap->iv_stats.is_scan_active++; 633 else 634 vap->iv_stats.is_scan_passive++; 635 /* 636 * NB: beware of the scan cache being flushed; 637 * if the channel list is empty use the 638 * scan_start method to populate it. 639 */ 640 ss->ss_next = 0; 641 if (ss->ss_last != 0) 642 ss->ss_ops->scan_restart(ss, vap); 643 else { 644 ss->ss_ops->scan_start(ss, vap); 645#ifdef IEEE80211_DEBUG 646 if (ieee80211_msg_scan(vap)) 647 scan_dump(ss); 648#endif /* IEEE80211_DEBUG */ 649 } 650 } 651 /* NB: flush frames rx'd before 1st channel change */ 652 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 653 SCAN_PRIVATE(ss)->ss_duration = duration; 654 ss->ss_maxdwell = duration; 655 ic->ic_flags |= IEEE80211_F_SCAN; 656 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN; 657 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 658 } else { 659 /* XXX msg+stat */ 660 } 661 } else { 662 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 663 "%s: %s scan already in progress\n", __func__, 664 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 665 } 666 IEEE80211_UNLOCK(ic); 667 668 /* NB: racey, does it matter? */ 669 return (ic->ic_flags & IEEE80211_F_SCAN); 670} 671 672/* 673 * Cancel any scan currently going on for the specified vap. 674 */ 675void 676ieee80211_cancel_scan(struct ieee80211vap *vap) 677{ 678 struct ieee80211com *ic = vap->iv_ic; 679 struct ieee80211_scan_state *ss = ic->ic_scan; 680 681 IEEE80211_LOCK(ic); 682 if ((ic->ic_flags & IEEE80211_F_SCAN) && 683 ss->ss_vap == vap && 684 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 685 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 686 "%s: cancel %s scan\n", __func__, 687 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 688 "active" : "passive"); 689 690 /* clear bg scan NOPICK and mark cancel request */ 691 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 692 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 693 /* wake up the scan task */ 694 scan_signal(ss); 695 } 696 IEEE80211_UNLOCK(ic); 697} 698 699/* 700 * Cancel any scan currently going on. 701 */ 702void 703ieee80211_cancel_anyscan(struct ieee80211vap *vap) 704{ 705 struct ieee80211com *ic = vap->iv_ic; 706 struct ieee80211_scan_state *ss = ic->ic_scan; 707 708 IEEE80211_LOCK(ic); 709 if ((ic->ic_flags & IEEE80211_F_SCAN) && 710 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 711 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 712 "%s: cancel %s scan\n", __func__, 713 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 714 "active" : "passive"); 715 716 /* clear bg scan NOPICK and mark cancel request */ 717 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 718 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 719 /* wake up the scan task */ 720 scan_signal(ss); 721 } 722 IEEE80211_UNLOCK(ic); 723} 724 725/* 726 * Public access to scan_next for drivers that manage 727 * scanning themselves (e.g. for firmware-based devices). 728 */ 729void 730ieee80211_scan_next(struct ieee80211vap *vap) 731{ 732 struct ieee80211com *ic = vap->iv_ic; 733 struct ieee80211_scan_state *ss = ic->ic_scan; 734 735 /* wake up the scan task */ 736 IEEE80211_LOCK(ic); 737 scan_signal(ss); 738 IEEE80211_UNLOCK(ic); 739} 740 741/* 742 * Public access to scan_next for drivers that are not able to scan single 743 * channels (e.g. for firmware-based devices). 744 */ 745void 746ieee80211_scan_done(struct ieee80211vap *vap) 747{ 748 struct ieee80211com *ic = vap->iv_ic; 749 struct ieee80211_scan_state *ss; 750 751 IEEE80211_LOCK(ic); 752 ss = ic->ic_scan; 753 ss->ss_next = ss->ss_last; /* all channels are complete */ 754 scan_signal(ss); 755 IEEE80211_UNLOCK(ic); 756} 757 758/* 759 * Probe the curent channel, if allowed, while scanning. 760 * If the channel is not marked passive-only then send 761 * a probe request immediately. Otherwise mark state and 762 * listen for beacons on the channel; if we receive something 763 * then we'll transmit a probe request. 764 */ 765void 766ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 767{ 768 struct ieee80211com *ic = vap->iv_ic; 769 struct ieee80211_scan_state *ss = ic->ic_scan; 770 struct ifnet *ifp = vap->iv_ifp; 771 int i; 772 773 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 774 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 775 return; 776 } 777 /* 778 * Send directed probe requests followed by any 779 * broadcast probe request. 780 * XXX remove dependence on ic/vap->iv_bss 781 */ 782 for (i = 0; i < ss->ss_nssid; i++) 783 ieee80211_send_probereq(vap->iv_bss, 784 vap->iv_myaddr, ifp->if_broadcastaddr, 785 ifp->if_broadcastaddr, 786 ss->ss_ssid[i].ssid, ss->ss_ssid[i].len); 787 if ((ss->ss_flags & IEEE80211_SCAN_NOBCAST) == 0) 788 ieee80211_send_probereq(vap->iv_bss, 789 vap->iv_myaddr, ifp->if_broadcastaddr, 790 ifp->if_broadcastaddr, 791 "", 0); 792} 793 794/* 795 * Scan curchan. If this is an active scan and the channel 796 * is not marked passive then send probe request frame(s). 797 * Arrange for the channel change after maxdwell ticks. 798 */ 799static void 800scan_curchan(struct ieee80211_scan_state *ss, unsigned long maxdwell) 801{ 802 struct ieee80211vap *vap = ss->ss_vap; 803 804 IEEE80211_LOCK(vap->iv_ic); 805 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 806 ieee80211_probe_curchan(vap, 0); 807 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 808 maxdwell, scan_signal, ss); 809 IEEE80211_UNLOCK(vap->iv_ic); 810} 811 812static void 813scan_signal(void *arg) 814{ 815 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 816 817 IEEE80211_LOCK_ASSERT(ss->ss_ic); 818 819 cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv); 820} 821 822/* 823 * Handle mindwell requirements completed; initiate a channel 824 * change to the next channel asap. 825 */ 826static void 827scan_mindwell(struct ieee80211_scan_state *ss) 828{ 829 struct ieee80211com *ic = ss->ss_ic; 830 831 IEEE80211_LOCK(ic); 832 scan_signal(ss); 833 IEEE80211_UNLOCK(ic); 834} 835 836static void 837scan_task(void *arg, int pending) 838{ 839#define ISCAN_REP (ISCAN_MINDWELL | ISCAN_DISCARD) 840 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 841 struct ieee80211vap *vap = ss->ss_vap; 842 struct ieee80211com *ic = ss->ss_ic; 843 struct ieee80211_channel *chan; 844 unsigned long maxdwell, scanend; 845 int scandone = 0; 846 847 IEEE80211_LOCK(ic); 848 if (vap == NULL || (ic->ic_flags & IEEE80211_F_SCAN) == 0 || 849 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)) { 850 /* Cancelled before we started */ 851 goto done; 852 } 853 854 if (ss->ss_next == ss->ss_last) { 855 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 856 "%s: no channels to scan\n", __func__); 857 goto done; 858 } 859 860 if (vap->iv_opmode == IEEE80211_M_STA && 861 vap->iv_state == IEEE80211_S_RUN) { 862 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) { 863 /* Enable station power save mode */ 864 ieee80211_sta_pwrsave(vap, 1); 865 /* 866 * Use an 1ms delay so the null data frame has a chance 867 * to go out. 868 * XXX Should use M_TXCB mechanism to eliminate this. 869 */ 870 cv_timedwait(&SCAN_PRIVATE(ss)->ss_scan_cv, 871 IEEE80211_LOCK_OBJ(ic), hz / 1000); 872 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 873 goto done; 874 } 875 } 876 877 scanend = ticks + SCAN_PRIVATE(ss)->ss_duration; 878 IEEE80211_UNLOCK(ic); 879 ic->ic_scan_start(ic); /* notify driver */ 880 IEEE80211_LOCK(ic); 881 882 for (;;) { 883 scandone = (ss->ss_next >= ss->ss_last) || 884 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0; 885 if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) || 886 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) || 887 time_after(ticks + ss->ss_mindwell, scanend)) 888 break; 889 890 chan = ss->ss_chans[ss->ss_next++]; 891 892 /* 893 * Watch for truncation due to the scan end time. 894 */ 895 if (time_after(ticks + ss->ss_maxdwell, scanend)) 896 maxdwell = scanend - ticks; 897 else 898 maxdwell = ss->ss_maxdwell; 899 900 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 901 "%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n", 902 __func__, 903 ieee80211_chan2ieee(ic, ic->ic_curchan), 904 channel_type(ic->ic_curchan), 905 ieee80211_chan2ieee(ic, chan), channel_type(chan), 906 (ss->ss_flags & IEEE80211_SCAN_ACTIVE) && 907 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ? 908 "active" : "passive", 909 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell)); 910 911 /* 912 * Potentially change channel and phy mode. 913 */ 914 ic->ic_curchan = chan; 915 ic->ic_rt = ieee80211_get_ratetable(chan); 916 IEEE80211_UNLOCK(ic); 917 /* 918 * Perform the channel change and scan unlocked so the driver 919 * may sleep. Once set_channel returns the hardware has 920 * completed the channel change. 921 */ 922 ic->ic_set_channel(ic); 923 ieee80211_radiotap_chan_change(ic); 924 925 /* 926 * Scan curchan. Drivers for "intelligent hardware" 927 * override ic_scan_curchan to tell the device to do 928 * the work. Otherwise we manage the work outselves; 929 * sending a probe request (as needed), and arming the 930 * timeout to switch channels after maxdwell ticks. 931 * 932 * scan_curchan should only pause for the time required to 933 * prepare/initiate the hardware for the scan (if at all), the 934 * below condvar is used to sleep for the channels dwell time 935 * and allows it to be signalled for abort. 936 */ 937 ic->ic_scan_curchan(ss, maxdwell); 938 IEEE80211_LOCK(ic); 939 940 SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell; 941 /* clear mindwell lock and initial channel change flush */ 942 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 943 944 if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT))) 945 continue; 946 947 /* Wait to be signalled to scan the next channel */ 948 cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv, IEEE80211_LOCK_OBJ(ic)); 949 } 950 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 951 goto done; 952 953 IEEE80211_UNLOCK(ic); 954 ic->ic_scan_end(ic); /* notify driver */ 955 IEEE80211_LOCK(ic); 956 957 /* 958 * Record scan complete time. Note that we also do 959 * this when canceled so any background scan will 960 * not be restarted for a while. 961 */ 962 if (scandone) 963 ic->ic_lastscan = ticks; 964 /* return to the bss channel */ 965 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 966 ic->ic_curchan != ic->ic_bsschan) { 967 ieee80211_setupcurchan(ic, ic->ic_bsschan); 968 IEEE80211_UNLOCK(ic); 969 ic->ic_set_channel(ic); 970 ieee80211_radiotap_chan_change(ic); 971 IEEE80211_LOCK(ic); 972 } 973 /* clear internal flags and any indication of a pick */ 974 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 975 ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK; 976 977 /* 978 * If not canceled and scan completed, do post-processing. 979 * If the callback function returns 0, then it wants to 980 * continue/restart scanning. Unfortunately we needed to 981 * notify the driver to end the scan above to avoid having 982 * rx frames alter the scan candidate list. 983 */ 984 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 && 985 !ss->ss_ops->scan_end(ss, vap) && 986 (ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 && 987 time_before(ticks + ss->ss_mindwell, scanend)) { 988 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 989 "%s: done, restart " 990 "[ticks %u, dwell min %lu scanend %lu]\n", 991 __func__, 992 ticks, ss->ss_mindwell, scanend); 993 ss->ss_next = 0; /* reset to begining */ 994 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 995 vap->iv_stats.is_scan_active++; 996 else 997 vap->iv_stats.is_scan_passive++; 998 999 ss->ss_ops->scan_restart(ss, vap); /* XXX? */ 1000 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 1001 IEEE80211_UNLOCK(ic); 1002 return; 1003 } 1004 1005 /* past here, scandone is ``true'' if not in bg mode */ 1006 if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0) 1007 scandone = 1; 1008 1009 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1010 "%s: %s, [ticks %u, dwell min %lu scanend %lu]\n", 1011 __func__, scandone ? "done" : "stopped", 1012 ticks, ss->ss_mindwell, scanend); 1013 1014 /* 1015 * Clear the SCAN bit first in case frames are 1016 * pending on the station power save queue. If 1017 * we defer this then the dispatch of the frames 1018 * may generate a request to cancel scanning. 1019 */ 1020done: 1021 ic->ic_flags &= ~IEEE80211_F_SCAN; 1022 /* 1023 * Drop out of power save mode when a scan has 1024 * completed. If this scan was prematurely terminated 1025 * because it is a background scan then don't notify 1026 * the ap; we'll either return to scanning after we 1027 * receive the beacon frame or we'll drop out of power 1028 * save mode because the beacon indicates we have frames 1029 * waiting for us. 1030 */ 1031 if (scandone) { 1032 ieee80211_sta_pwrsave(vap, 0); 1033 if (ss->ss_next >= ss->ss_last) { 1034 ieee80211_notify_scan_done(vap); 1035 ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN; 1036 } 1037 } 1038 SCAN_PRIVATE(ss)->ss_iflags &= ~(ISCAN_CANCEL|ISCAN_ABORT); 1039 ss->ss_flags &= ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST); 1040 IEEE80211_UNLOCK(ic); 1041#undef ISCAN_REP 1042} 1043 1044#ifdef IEEE80211_DEBUG 1045static void 1046dump_country(const uint8_t *ie) 1047{ 1048 const struct ieee80211_country_ie *cie = 1049 (const struct ieee80211_country_ie *) ie; 1050 int i, nbands, schan, nchan; 1051 1052 if (cie->len < 3) { 1053 printf(" <bogus country ie, len %d>", cie->len); 1054 return; 1055 } 1056 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 1057 nbands = (cie->len - 3) / sizeof(cie->band[0]); 1058 for (i = 0; i < nbands; i++) { 1059 schan = cie->band[i].schan; 1060 nchan = cie->band[i].nchan; 1061 if (nchan != 1) 1062 printf(" %u-%u,%u", schan, schan + nchan-1, 1063 cie->band[i].maxtxpwr); 1064 else 1065 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 1066 } 1067 printf("]"); 1068} 1069 1070static void 1071dump_probe_beacon(uint8_t subtype, int isnew, 1072 const uint8_t mac[IEEE80211_ADDR_LEN], 1073 const struct ieee80211_scanparams *sp, int rssi) 1074{ 1075 1076 printf("[%s] %s%s on chan %u (bss chan %u) ", 1077 ether_sprintf(mac), isnew ? "new " : "", 1078 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], 1079 sp->chan, sp->bchan); 1080 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 1081 printf(" rssi %d\n", rssi); 1082 1083 if (isnew) { 1084 printf("[%s] caps 0x%x bintval %u erp 0x%x", 1085 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 1086 if (sp->country != NULL) 1087 dump_country(sp->country); 1088 printf("\n"); 1089 } 1090} 1091#endif /* IEEE80211_DEBUG */ 1092 1093/* 1094 * Process a beacon or probe response frame. 1095 */ 1096void 1097ieee80211_add_scan(struct ieee80211vap *vap, 1098 const struct ieee80211_scanparams *sp, 1099 const struct ieee80211_frame *wh, 1100 int subtype, int rssi, int noise) 1101{ 1102 struct ieee80211com *ic = vap->iv_ic; 1103 struct ieee80211_scan_state *ss = ic->ic_scan; 1104 1105 /* XXX locking */ 1106 /* 1107 * Frames received during startup are discarded to avoid 1108 * using scan state setup on the initial entry to the timer 1109 * callback. This can occur because the device may enable 1110 * rx prior to our doing the initial channel change in the 1111 * timer routine. 1112 */ 1113 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD) 1114 return; 1115#ifdef IEEE80211_DEBUG 1116 if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN)) 1117 dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi); 1118#endif 1119 if (ss->ss_ops != NULL && 1120 ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise)) { 1121 /* 1122 * If we've reached the min dwell time terminate 1123 * the timer so we'll switch to the next channel. 1124 */ 1125 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 && 1126 time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) { 1127 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1128 "%s: chan %3d%c min dwell met (%u > %lu)\n", 1129 __func__, 1130 ieee80211_chan2ieee(ic, ic->ic_curchan), 1131 channel_type(ic->ic_curchan), 1132 ticks, SCAN_PRIVATE(ss)->ss_chanmindwell); 1133 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL; 1134 /* 1135 * NB: trigger at next clock tick or wait for the 1136 * hardware. 1137 */ 1138 ic->ic_scan_mindwell(ss); 1139 } 1140 } 1141} 1142 1143/* 1144 * Timeout/age scan cache entries; called from sta timeout 1145 * timer (XXX should be self-contained). 1146 */ 1147void 1148ieee80211_scan_timeout(struct ieee80211com *ic) 1149{ 1150 struct ieee80211_scan_state *ss = ic->ic_scan; 1151 1152 if (ss->ss_ops != NULL) 1153 ss->ss_ops->scan_age(ss); 1154} 1155 1156/* 1157 * Mark a scan cache entry after a successful associate. 1158 */ 1159void 1160ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 1161{ 1162 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1163 1164 if (ss->ss_ops != NULL) { 1165 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 1166 mac, "%s", __func__); 1167 ss->ss_ops->scan_assoc_success(ss, mac); 1168 } 1169} 1170 1171/* 1172 * Demerit a scan cache entry after failing to associate. 1173 */ 1174void 1175ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 1176 const uint8_t mac[], int reason) 1177{ 1178 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1179 1180 if (ss->ss_ops != NULL) { 1181 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 1182 "%s: reason %u", __func__, reason); 1183 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 1184 } 1185} 1186 1187/* 1188 * Iterate over the contents of the scan cache. 1189 */ 1190void 1191ieee80211_scan_iterate(struct ieee80211vap *vap, 1192 ieee80211_scan_iter_func *f, void *arg) 1193{ 1194 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1195 1196 if (ss->ss_ops != NULL) 1197 ss->ss_ops->scan_iterate(ss, f, arg); 1198} 1199 1200/* 1201 * Flush the contents of the scan cache. 1202 */ 1203void 1204ieee80211_scan_flush(struct ieee80211vap *vap) 1205{ 1206 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1207 1208 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 1209 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 1210 ss->ss_ops->scan_flush(ss); 1211 } 1212} 1213 1214/* 1215 * Check the scan cache for an ap/channel to use; if that 1216 * fails then kick off a new scan. 1217 */ 1218struct ieee80211_channel * 1219ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 1220{ 1221 struct ieee80211_scan_state *ss = ic->ic_scan; 1222 1223 IEEE80211_LOCK_ASSERT(ic); 1224 1225 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 1226 /* XXX printf? */ 1227 return NULL; 1228 } 1229 if (ss->ss_ops->scan_pickchan == NULL) { 1230 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 1231 "%s: scan module does not support picking a channel, " 1232 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 1233 return NULL; 1234 } 1235 return ss->ss_ops->scan_pickchan(ss, flags); 1236} 1237