ieee80211_scan.c revision 193366
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 193366 2009-06-03 04:10:22Z weongyo $"); 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 callout_drain(&SCAN_PRIVATE(ss)->ss_scan_timer); 135 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, 136 ("scan still running")); 137 if (ss->ss_ops != NULL) { 138 ss->ss_ops->scan_detach(ss); 139 ss->ss_ops = NULL; 140 } 141 ic->ic_scan = NULL; 142 free(SCAN_PRIVATE(ss), M_80211_SCAN); 143 } 144} 145 146static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = { 147 [IEEE80211_MODE_11A] = { .rssi = ROAM_RSSI_11A_DEFAULT, 148 .rate = ROAM_RATE_11A_DEFAULT }, 149 [IEEE80211_MODE_11G] = { .rssi = ROAM_RSSI_11B_DEFAULT, 150 .rate = ROAM_RATE_11B_DEFAULT }, 151 [IEEE80211_MODE_11B] = { .rssi = ROAM_RSSI_11BONLY_DEFAULT, 152 .rate = ROAM_RATE_11BONLY_DEFAULT }, 153 [IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT, 154 .rate = ROAM_RATE_11A_DEFAULT }, 155 [IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT, 156 .rate = ROAM_RATE_11A_DEFAULT }, 157 [IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT, 158 .rate = ROAM_RATE_11A_DEFAULT }, 159 [IEEE80211_MODE_HALF] = { .rssi = ROAM_RSSI_11A_DEFAULT, 160 .rate = ROAM_RATE_HALF_DEFAULT }, 161 [IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT, 162 .rate = ROAM_RATE_QUARTER_DEFAULT }, 163 [IEEE80211_MODE_11NA] = { .rssi = ROAM_RSSI_11A_DEFAULT, 164 .rate = ROAM_MCS_11N_DEFAULT }, 165 [IEEE80211_MODE_11NG] = { .rssi = ROAM_RSSI_11B_DEFAULT, 166 .rate = ROAM_MCS_11N_DEFAULT }, 167}; 168 169void 170ieee80211_scan_vattach(struct ieee80211vap *vap) 171{ 172 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz; 173 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz; 174 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz; 175 176 vap->iv_roaming = IEEE80211_ROAMING_AUTO; 177 memcpy(vap->iv_roamparms, defroam, sizeof(defroam)); 178} 179 180void 181ieee80211_scan_vdetach(struct ieee80211vap *vap) 182{ 183 struct ieee80211com *ic = vap->iv_ic; 184 struct ieee80211_scan_state *ss; 185 186 IEEE80211_LOCK(ic); 187 ss = ic->ic_scan; 188 if (ss != NULL && ss->ss_vap == vap) { 189 if (ic->ic_flags & IEEE80211_F_SCAN) { 190 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT; 191 scan_signal(ss); 192 } 193 if (ss->ss_ops != NULL) { 194 ss->ss_ops->scan_detach(ss); 195 ss->ss_ops = NULL; 196 } 197 ss->ss_vap = NULL; 198 } 199 IEEE80211_UNLOCK(ic); 200} 201 202/* 203 * Simple-minded scanner module support. 204 */ 205static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 206 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 207 "wlan_scan_sta", /* IEEE80211_M_STA */ 208 "wlan_scan_wds", /* IEEE80211_M_WDS */ 209 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 210 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 211 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 212}; 213static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 214 215const struct ieee80211_scanner * 216ieee80211_scanner_get(enum ieee80211_opmode mode) 217{ 218 if (mode >= IEEE80211_OPMODE_MAX) 219 return NULL; 220 if (scanners[mode] == NULL) 221 ieee80211_load_module(scan_modnames[mode]); 222 return scanners[mode]; 223} 224 225void 226ieee80211_scanner_register(enum ieee80211_opmode mode, 227 const struct ieee80211_scanner *scan) 228{ 229 if (mode >= IEEE80211_OPMODE_MAX) 230 return; 231 scanners[mode] = scan; 232} 233 234void 235ieee80211_scanner_unregister(enum ieee80211_opmode mode, 236 const struct ieee80211_scanner *scan) 237{ 238 if (mode >= IEEE80211_OPMODE_MAX) 239 return; 240 if (scanners[mode] == scan) 241 scanners[mode] = NULL; 242} 243 244void 245ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 246{ 247 int m; 248 249 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 250 if (scanners[m] == scan) 251 scanners[m] = NULL; 252} 253 254/* 255 * Update common scanner state to reflect the current 256 * operating mode. This is called when the state machine 257 * is transitioned to RUN state w/o scanning--e.g. when 258 * operating in monitor mode. The purpose of this is to 259 * ensure later callbacks find ss_ops set to properly 260 * reflect current operating mode. 261 */ 262static void 263scan_update_locked(struct ieee80211vap *vap, 264 const struct ieee80211_scanner *scan) 265{ 266 struct ieee80211com *ic = vap->iv_ic; 267 struct ieee80211_scan_state *ss = ic->ic_scan; 268 269 IEEE80211_LOCK_ASSERT(ic); 270 271#ifdef IEEE80211_DEBUG 272 if (ss->ss_vap != vap || ss->ss_ops != scan) { 273 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 274 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 275 __func__, 276 ss->ss_vap != NULL ? 277 ss->ss_vap->iv_ifp->if_xname : "none", 278 ss->ss_vap != NULL ? 279 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 280 vap->iv_ifp->if_xname, 281 ieee80211_opmode_name[vap->iv_opmode]); 282 } 283#endif 284 ss->ss_vap = vap; 285 if (ss->ss_ops != scan) { 286 /* 287 * Switch scanners; detach old, attach new. Special 288 * case where a single scan module implements multiple 289 * policies by using different scan ops but a common 290 * core. We assume if the old and new attach methods 291 * are identical then it's ok to just change ss_ops 292 * and not flush the internal state of the module. 293 */ 294 if (scan == NULL || ss->ss_ops == NULL || 295 ss->ss_ops->scan_attach != scan->scan_attach) { 296 if (ss->ss_ops != NULL) 297 ss->ss_ops->scan_detach(ss); 298 if (scan != NULL && !scan->scan_attach(ss)) { 299 /* XXX attach failure */ 300 /* XXX stat+msg */ 301 scan = NULL; 302 } 303 } 304 ss->ss_ops = scan; 305 } 306} 307 308static char 309channel_type(const struct ieee80211_channel *c) 310{ 311 if (IEEE80211_IS_CHAN_ST(c)) 312 return 'S'; 313 if (IEEE80211_IS_CHAN_108A(c)) 314 return 'T'; 315 if (IEEE80211_IS_CHAN_108G(c)) 316 return 'G'; 317 if (IEEE80211_IS_CHAN_HT(c)) 318 return 'n'; 319 if (IEEE80211_IS_CHAN_A(c)) 320 return 'a'; 321 if (IEEE80211_IS_CHAN_ANYG(c)) 322 return 'g'; 323 if (IEEE80211_IS_CHAN_B(c)) 324 return 'b'; 325 return 'f'; 326} 327 328void 329ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 330{ 331 struct ieee80211com *ic = ss->ss_ic; 332 const char *sep; 333 int i; 334 335 sep = ""; 336 for (i = ss->ss_next; i < ss->ss_last; i++) { 337 const struct ieee80211_channel *c = ss->ss_chans[i]; 338 339 printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 340 channel_type(c)); 341 sep = ", "; 342 } 343} 344 345#ifdef IEEE80211_DEBUG 346static void 347scan_dump(struct ieee80211_scan_state *ss) 348{ 349 struct ieee80211vap *vap = ss->ss_vap; 350 351 if_printf(vap->iv_ifp, "scan set "); 352 ieee80211_scan_dump_channels(ss); 353 printf(" dwell min %lums max %lums\n", 354 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 355} 356#endif /* IEEE80211_DEBUG */ 357 358static void 359copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 360 int nssid, const struct ieee80211_scan_ssid ssids[]) 361{ 362 if (nssid > IEEE80211_SCAN_MAX_SSID) { 363 /* XXX printf */ 364 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 365 "%s: too many ssid %d, ignoring all of them\n", 366 __func__, nssid); 367 return; 368 } 369 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 370 ss->ss_nssid = nssid; 371} 372 373/* 374 * Start a scan unless one is already going. 375 */ 376static int 377start_scan_locked(const struct ieee80211_scanner *scan, 378 struct ieee80211vap *vap, int flags, u_int duration, 379 u_int mindwell, u_int maxdwell, 380 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 381{ 382 struct ieee80211com *ic = vap->iv_ic; 383 struct ieee80211_scan_state *ss = ic->ic_scan; 384 385 IEEE80211_LOCK_ASSERT(ic); 386 387 if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 388 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 389 "%s: scan inhibited by pending channel change\n", __func__); 390 } else if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 391 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 392 "%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n" 393 , __func__ 394 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 395 , duration, mindwell, maxdwell 396 , ieee80211_phymode_name[vap->iv_des_mode] 397 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 398 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 399 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 400 , flags & IEEE80211_SCAN_NOBCAST ? ", nobcast" : "" 401 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 402 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 403 ); 404 405 scan_update_locked(vap, scan); 406 if (ss->ss_ops != NULL) { 407 if ((flags & IEEE80211_SCAN_NOSSID) == 0) 408 copy_ssid(vap, ss, nssid, ssids); 409 410 /* NB: top 4 bits for internal use */ 411 ss->ss_flags = flags & 0xfff; 412 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 413 vap->iv_stats.is_scan_active++; 414 else 415 vap->iv_stats.is_scan_passive++; 416 if (flags & IEEE80211_SCAN_FLUSH) 417 ss->ss_ops->scan_flush(ss); 418 419 /* NB: flush frames rx'd before 1st channel change */ 420 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 421 SCAN_PRIVATE(ss)->ss_duration = duration; 422 ss->ss_next = 0; 423 ss->ss_mindwell = mindwell; 424 ss->ss_maxdwell = maxdwell; 425 /* NB: scan_start must be before the scan runtask */ 426 ss->ss_ops->scan_start(ss, vap); 427#ifdef IEEE80211_DEBUG 428 if (ieee80211_msg_scan(vap)) 429 scan_dump(ss); 430#endif /* IEEE80211_DEBUG */ 431 ic->ic_flags |= IEEE80211_F_SCAN; 432 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 433 } 434 } else { 435 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 436 "%s: %s scan already in progress\n", __func__, 437 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 438 } 439 return (ic->ic_flags & IEEE80211_F_SCAN); 440} 441 442/* 443 * Start a scan unless one is already going. 444 */ 445int 446ieee80211_start_scan(struct ieee80211vap *vap, int flags, 447 u_int duration, u_int mindwell, u_int maxdwell, 448 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 449{ 450 struct ieee80211com *ic = vap->iv_ic; 451 const struct ieee80211_scanner *scan; 452 int result; 453 454 scan = ieee80211_scanner_get(vap->iv_opmode); 455 if (scan == NULL) { 456 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 457 "%s: no scanner support for %s mode\n", 458 __func__, ieee80211_opmode_name[vap->iv_opmode]); 459 /* XXX stat */ 460 return 0; 461 } 462 463 IEEE80211_LOCK(ic); 464 result = start_scan_locked(scan, vap, flags, duration, 465 mindwell, maxdwell, nssid, ssids); 466 IEEE80211_UNLOCK(ic); 467 468 return result; 469} 470 471/* 472 * Check the scan cache for an ap/channel to use; if that 473 * fails then kick off a new scan. 474 */ 475int 476ieee80211_check_scan(struct ieee80211vap *vap, int flags, 477 u_int duration, u_int mindwell, u_int maxdwell, 478 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 479{ 480 struct ieee80211com *ic = vap->iv_ic; 481 struct ieee80211_scan_state *ss = ic->ic_scan; 482 const struct ieee80211_scanner *scan; 483 int result; 484 485 scan = ieee80211_scanner_get(vap->iv_opmode); 486 if (scan == NULL) { 487 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 488 "%s: no scanner support for %s mode\n", 489 __func__, vap->iv_opmode); 490 /* XXX stat */ 491 return 0; 492 } 493 494 /* 495 * Check if there's a list of scan candidates already. 496 * XXX want more than the ap we're currently associated with 497 */ 498 499 IEEE80211_LOCK(ic); 500 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 501 "%s: %s scan, %s%s%s%s%s\n" 502 , __func__ 503 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 504 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 505 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 506 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 507 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 508 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 509 ); 510 511 if (ss->ss_ops != scan) { 512 /* XXX re-use cache contents? e.g. adhoc<->sta */ 513 flags |= IEEE80211_SCAN_FLUSH; 514 } 515 scan_update_locked(vap, scan); 516 if (ss->ss_ops != NULL) { 517 /* XXX verify ss_ops matches vap->iv_opmode */ 518 if ((flags & IEEE80211_SCAN_NOSSID) == 0) { 519 /* 520 * Update the ssid list and mark flags so if 521 * we call start_scan it doesn't duplicate work. 522 */ 523 copy_ssid(vap, ss, nssid, ssids); 524 flags |= IEEE80211_SCAN_NOSSID; 525 } 526 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 527 (flags & IEEE80211_SCAN_FLUSH) == 0 && 528 time_before(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 529 /* 530 * We're not currently scanning and the cache is 531 * deemed hot enough to consult. Lock out others 532 * by marking IEEE80211_F_SCAN while we decide if 533 * something is already in the scan cache we can 534 * use. Also discard any frames that might come 535 * in while temporarily marked as scanning. 536 */ 537 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 538 ic->ic_flags |= IEEE80211_F_SCAN; 539 540 /* NB: need to use supplied flags in check */ 541 ss->ss_flags = flags & 0xff; 542 result = ss->ss_ops->scan_end(ss, vap); 543 544 ic->ic_flags &= ~IEEE80211_F_SCAN; 545 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD; 546 if (result) { 547 ieee80211_notify_scan_done(vap); 548 IEEE80211_UNLOCK(ic); 549 return 1; 550 } 551 } 552 } 553 result = start_scan_locked(scan, vap, flags, duration, 554 mindwell, maxdwell, nssid, ssids); 555 IEEE80211_UNLOCK(ic); 556 557 return result; 558} 559 560/* 561 * Check the scan cache for an ap/channel to use; if that fails 562 * then kick off a scan using the current settings. 563 */ 564int 565ieee80211_check_scan_current(struct ieee80211vap *vap) 566{ 567 return ieee80211_check_scan(vap, 568 IEEE80211_SCAN_ACTIVE, 569 IEEE80211_SCAN_FOREVER, 0, 0, 570 vap->iv_des_nssid, vap->iv_des_ssid); 571} 572 573/* 574 * Restart a previous scan. If the previous scan completed 575 * then we start again using the existing channel list. 576 */ 577int 578ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 579{ 580 struct ieee80211com *ic = vap->iv_ic; 581 struct ieee80211_scan_state *ss = ic->ic_scan; 582 const struct ieee80211_scanner *scan; 583 584 scan = ieee80211_scanner_get(vap->iv_opmode); 585 if (scan == NULL) { 586 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 587 "%s: no scanner support for %s mode\n", 588 __func__, vap->iv_opmode); 589 /* XXX stat */ 590 return 0; 591 } 592 593 IEEE80211_LOCK(ic); 594 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 595 u_int duration; 596 /* 597 * Go off-channel for a fixed interval that is large 598 * enough to catch most ap's but short enough that 599 * we can return on-channel before our listen interval 600 * expires. 601 */ 602 duration = IEEE80211_SCAN_OFFCHANNEL; 603 604 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 605 "%s: %s scan, ticks %u duration %lu\n", __func__, 606 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive", 607 ticks, duration); 608 609 scan_update_locked(vap, scan); 610 if (ss->ss_ops != NULL) { 611 ss->ss_vap = vap; 612 /* 613 * A background scan does not select a new sta; it 614 * just refreshes the scan cache. Also, indicate 615 * the scan logic should follow the beacon schedule: 616 * we go off-channel and scan for a while, then 617 * return to the bss channel to receive a beacon, 618 * then go off-channel again. All during this time 619 * we notify the ap we're in power save mode. When 620 * the scan is complete we leave power save mode. 621 * If any beacon indicates there are frames pending 622 * for us then we drop out of power save mode 623 * (and background scan) automatically by way of the 624 * usual sta power save logic. 625 */ 626 ss->ss_flags |= IEEE80211_SCAN_NOPICK 627 | IEEE80211_SCAN_BGSCAN 628 | flags 629 ; 630 /* if previous scan completed, restart */ 631 if (ss->ss_next >= ss->ss_last) { 632 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 633 vap->iv_stats.is_scan_active++; 634 else 635 vap->iv_stats.is_scan_passive++; 636 /* 637 * NB: beware of the scan cache being flushed; 638 * if the channel list is empty use the 639 * scan_start method to populate it. 640 */ 641 ss->ss_next = 0; 642 if (ss->ss_last != 0) 643 ss->ss_ops->scan_restart(ss, vap); 644 else { 645 ss->ss_ops->scan_start(ss, vap); 646#ifdef IEEE80211_DEBUG 647 if (ieee80211_msg_scan(vap)) 648 scan_dump(ss); 649#endif /* IEEE80211_DEBUG */ 650 } 651 } 652 /* NB: flush frames rx'd before 1st channel change */ 653 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 654 SCAN_PRIVATE(ss)->ss_duration = duration; 655 ss->ss_maxdwell = duration; 656 ic->ic_flags |= IEEE80211_F_SCAN; 657 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN; 658 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 659 } else { 660 /* XXX msg+stat */ 661 } 662 } else { 663 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 664 "%s: %s scan already in progress\n", __func__, 665 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 666 } 667 IEEE80211_UNLOCK(ic); 668 669 /* NB: racey, does it matter? */ 670 return (ic->ic_flags & IEEE80211_F_SCAN); 671} 672 673/* 674 * Cancel any scan currently going on for the specified vap. 675 */ 676void 677ieee80211_cancel_scan(struct ieee80211vap *vap) 678{ 679 struct ieee80211com *ic = vap->iv_ic; 680 struct ieee80211_scan_state *ss = ic->ic_scan; 681 682 IEEE80211_LOCK(ic); 683 if ((ic->ic_flags & IEEE80211_F_SCAN) && 684 ss->ss_vap == vap && 685 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 686 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 687 "%s: cancel %s scan\n", __func__, 688 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 689 "active" : "passive"); 690 691 /* clear bg scan NOPICK and mark cancel request */ 692 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 693 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 694 /* wake up the scan task */ 695 scan_signal(ss); 696 } 697 IEEE80211_UNLOCK(ic); 698} 699 700/* 701 * Cancel any scan currently going on. 702 */ 703void 704ieee80211_cancel_anyscan(struct ieee80211vap *vap) 705{ 706 struct ieee80211com *ic = vap->iv_ic; 707 struct ieee80211_scan_state *ss = ic->ic_scan; 708 709 IEEE80211_LOCK(ic); 710 if ((ic->ic_flags & IEEE80211_F_SCAN) && 711 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 712 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 713 "%s: cancel %s scan\n", __func__, 714 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 715 "active" : "passive"); 716 717 /* clear bg scan NOPICK and mark cancel request */ 718 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 719 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 720 /* wake up the scan task */ 721 scan_signal(ss); 722 } 723 IEEE80211_UNLOCK(ic); 724} 725 726/* 727 * Public access to scan_next for drivers that manage 728 * scanning themselves (e.g. for firmware-based devices). 729 */ 730void 731ieee80211_scan_next(struct ieee80211vap *vap) 732{ 733 struct ieee80211com *ic = vap->iv_ic; 734 struct ieee80211_scan_state *ss = ic->ic_scan; 735 736 /* wake up the scan task */ 737 IEEE80211_LOCK(ic); 738 scan_signal(ss); 739 IEEE80211_UNLOCK(ic); 740} 741 742/* 743 * Public access to scan_next for drivers that are not able to scan single 744 * channels (e.g. for firmware-based devices). 745 */ 746void 747ieee80211_scan_done(struct ieee80211vap *vap) 748{ 749 struct ieee80211com *ic = vap->iv_ic; 750 struct ieee80211_scan_state *ss; 751 752 IEEE80211_LOCK(ic); 753 ss = ic->ic_scan; 754 ss->ss_next = ss->ss_last; /* all channels are complete */ 755 scan_signal(ss); 756 IEEE80211_UNLOCK(ic); 757} 758 759/* 760 * Probe the curent channel, if allowed, while scanning. 761 * If the channel is not marked passive-only then send 762 * a probe request immediately. Otherwise mark state and 763 * listen for beacons on the channel; if we receive something 764 * then we'll transmit a probe request. 765 */ 766void 767ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 768{ 769 struct ieee80211com *ic = vap->iv_ic; 770 struct ieee80211_scan_state *ss = ic->ic_scan; 771 struct ifnet *ifp = vap->iv_ifp; 772 int i; 773 774 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 775 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 776 return; 777 } 778 /* 779 * Send directed probe requests followed by any 780 * broadcast probe request. 781 * XXX remove dependence on ic/vap->iv_bss 782 */ 783 for (i = 0; i < ss->ss_nssid; i++) 784 ieee80211_send_probereq(vap->iv_bss, 785 vap->iv_myaddr, ifp->if_broadcastaddr, 786 ifp->if_broadcastaddr, 787 ss->ss_ssid[i].ssid, ss->ss_ssid[i].len); 788 if ((ss->ss_flags & IEEE80211_SCAN_NOBCAST) == 0) 789 ieee80211_send_probereq(vap->iv_bss, 790 vap->iv_myaddr, ifp->if_broadcastaddr, 791 ifp->if_broadcastaddr, 792 "", 0); 793} 794 795/* 796 * Scan curchan. If this is an active scan and the channel 797 * is not marked passive then send probe request frame(s). 798 * Arrange for the channel change after maxdwell ticks. 799 */ 800static void 801scan_curchan(struct ieee80211_scan_state *ss, unsigned long maxdwell) 802{ 803 struct ieee80211vap *vap = ss->ss_vap; 804 805 IEEE80211_LOCK(vap->iv_ic); 806 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 807 ieee80211_probe_curchan(vap, 0); 808 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 809 maxdwell, scan_signal, ss); 810 IEEE80211_UNLOCK(vap->iv_ic); 811} 812 813static void 814scan_signal(void *arg) 815{ 816 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 817 818 IEEE80211_LOCK_ASSERT(ss->ss_ic); 819 820 cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv); 821} 822 823/* 824 * Handle mindwell requirements completed; initiate a channel 825 * change to the next channel asap. 826 */ 827static void 828scan_mindwell(struct ieee80211_scan_state *ss) 829{ 830 struct ieee80211com *ic = ss->ss_ic; 831 832 IEEE80211_LOCK(ic); 833 scan_signal(ss); 834 IEEE80211_UNLOCK(ic); 835} 836 837static void 838scan_task(void *arg, int pending) 839{ 840#define ISCAN_REP (ISCAN_MINDWELL | ISCAN_DISCARD) 841 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 842 struct ieee80211vap *vap = ss->ss_vap; 843 struct ieee80211com *ic = ss->ss_ic; 844 struct ieee80211_channel *chan; 845 unsigned long maxdwell, scanend; 846 int scandone = 0; 847 848 IEEE80211_LOCK(ic); 849 if (vap == NULL || (ic->ic_flags & IEEE80211_F_SCAN) == 0 || 850 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)) { 851 /* Cancelled before we started */ 852 goto done; 853 } 854 855 if (ss->ss_next == ss->ss_last) { 856 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 857 "%s: no channels to scan\n", __func__); 858 goto done; 859 } 860 861 if (vap->iv_opmode == IEEE80211_M_STA && 862 vap->iv_state == IEEE80211_S_RUN) { 863 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) { 864 /* Enable station power save mode */ 865 ieee80211_sta_pwrsave(vap, 1); 866 /* 867 * Use an 1ms delay so the null data frame has a chance 868 * to go out. 869 * XXX Should use M_TXCB mechanism to eliminate this. 870 */ 871 cv_timedwait(&SCAN_PRIVATE(ss)->ss_scan_cv, 872 IEEE80211_LOCK_OBJ(ic), hz / 1000); 873 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 874 goto done; 875 } 876 } 877 878 scanend = ticks + SCAN_PRIVATE(ss)->ss_duration; 879 IEEE80211_UNLOCK(ic); 880 ic->ic_scan_start(ic); /* notify driver */ 881 IEEE80211_LOCK(ic); 882 883 for (;;) { 884 scandone = (ss->ss_next >= ss->ss_last) || 885 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0; 886 if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) || 887 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) || 888 time_after(ticks + ss->ss_mindwell, scanend)) 889 break; 890 891 chan = ss->ss_chans[ss->ss_next++]; 892 893 /* 894 * Watch for truncation due to the scan end time. 895 */ 896 if (time_after(ticks + ss->ss_maxdwell, scanend)) 897 maxdwell = scanend - ticks; 898 else 899 maxdwell = ss->ss_maxdwell; 900 901 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 902 "%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n", 903 __func__, 904 ieee80211_chan2ieee(ic, ic->ic_curchan), 905 channel_type(ic->ic_curchan), 906 ieee80211_chan2ieee(ic, chan), channel_type(chan), 907 (ss->ss_flags & IEEE80211_SCAN_ACTIVE) && 908 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ? 909 "active" : "passive", 910 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell)); 911 912 /* 913 * Potentially change channel and phy mode. 914 */ 915 ic->ic_curchan = chan; 916 ic->ic_rt = ieee80211_get_ratetable(chan); 917 IEEE80211_UNLOCK(ic); 918 /* 919 * Perform the channel change and scan unlocked so the driver 920 * may sleep. Once set_channel returns the hardware has 921 * completed the channel change. 922 */ 923 ic->ic_set_channel(ic); 924 ieee80211_radiotap_chan_change(ic); 925 926 /* 927 * Scan curchan. Drivers for "intelligent hardware" 928 * override ic_scan_curchan to tell the device to do 929 * the work. Otherwise we manage the work outselves; 930 * sending a probe request (as needed), and arming the 931 * timeout to switch channels after maxdwell ticks. 932 * 933 * scan_curchan should only pause for the time required to 934 * prepare/initiate the hardware for the scan (if at all), the 935 * below condvar is used to sleep for the channels dwell time 936 * and allows it to be signalled for abort. 937 */ 938 ic->ic_scan_curchan(ss, maxdwell); 939 IEEE80211_LOCK(ic); 940 941 SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell; 942 /* clear mindwell lock and initial channel change flush */ 943 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 944 945 if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT))) 946 continue; 947 948 /* Wait to be signalled to scan the next channel */ 949 cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv, IEEE80211_LOCK_OBJ(ic)); 950 } 951 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 952 goto done; 953 954 IEEE80211_UNLOCK(ic); 955 ic->ic_scan_end(ic); /* notify driver */ 956 IEEE80211_LOCK(ic); 957 958 /* 959 * Record scan complete time. Note that we also do 960 * this when canceled so any background scan will 961 * not be restarted for a while. 962 */ 963 if (scandone) 964 ic->ic_lastscan = ticks; 965 /* return to the bss channel */ 966 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 967 ic->ic_curchan != ic->ic_bsschan) { 968 ieee80211_setupcurchan(ic, ic->ic_bsschan); 969 IEEE80211_UNLOCK(ic); 970 ic->ic_set_channel(ic); 971 ieee80211_radiotap_chan_change(ic); 972 IEEE80211_LOCK(ic); 973 } 974 /* clear internal flags and any indication of a pick */ 975 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 976 ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK; 977 978 /* 979 * If not canceled and scan completed, do post-processing. 980 * If the callback function returns 0, then it wants to 981 * continue/restart scanning. Unfortunately we needed to 982 * notify the driver to end the scan above to avoid having 983 * rx frames alter the scan candidate list. 984 */ 985 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 && 986 !ss->ss_ops->scan_end(ss, vap) && 987 (ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 && 988 time_before(ticks + ss->ss_mindwell, scanend)) { 989 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 990 "%s: done, restart " 991 "[ticks %u, dwell min %lu scanend %lu]\n", 992 __func__, 993 ticks, ss->ss_mindwell, scanend); 994 ss->ss_next = 0; /* reset to begining */ 995 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 996 vap->iv_stats.is_scan_active++; 997 else 998 vap->iv_stats.is_scan_passive++; 999 1000 ss->ss_ops->scan_restart(ss, vap); /* XXX? */ 1001 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 1002 IEEE80211_UNLOCK(ic); 1003 return; 1004 } 1005 1006 /* past here, scandone is ``true'' if not in bg mode */ 1007 if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0) 1008 scandone = 1; 1009 1010 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1011 "%s: %s, [ticks %u, dwell min %lu scanend %lu]\n", 1012 __func__, scandone ? "done" : "stopped", 1013 ticks, ss->ss_mindwell, scanend); 1014 1015 /* 1016 * Clear the SCAN bit first in case frames are 1017 * pending on the station power save queue. If 1018 * we defer this then the dispatch of the frames 1019 * may generate a request to cancel scanning. 1020 */ 1021done: 1022 ic->ic_flags &= ~IEEE80211_F_SCAN; 1023 /* 1024 * Drop out of power save mode when a scan has 1025 * completed. If this scan was prematurely terminated 1026 * because it is a background scan then don't notify 1027 * the ap; we'll either return to scanning after we 1028 * receive the beacon frame or we'll drop out of power 1029 * save mode because the beacon indicates we have frames 1030 * waiting for us. 1031 */ 1032 if (scandone) { 1033 ieee80211_sta_pwrsave(vap, 0); 1034 if (ss->ss_next >= ss->ss_last) { 1035 ieee80211_notify_scan_done(vap); 1036 ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN; 1037 } 1038 } 1039 SCAN_PRIVATE(ss)->ss_iflags &= ~(ISCAN_CANCEL|ISCAN_ABORT); 1040 ss->ss_flags &= ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST); 1041 IEEE80211_UNLOCK(ic); 1042#undef ISCAN_REP 1043} 1044 1045#ifdef IEEE80211_DEBUG 1046static void 1047dump_country(const uint8_t *ie) 1048{ 1049 const struct ieee80211_country_ie *cie = 1050 (const struct ieee80211_country_ie *) ie; 1051 int i, nbands, schan, nchan; 1052 1053 if (cie->len < 3) { 1054 printf(" <bogus country ie, len %d>", cie->len); 1055 return; 1056 } 1057 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 1058 nbands = (cie->len - 3) / sizeof(cie->band[0]); 1059 for (i = 0; i < nbands; i++) { 1060 schan = cie->band[i].schan; 1061 nchan = cie->band[i].nchan; 1062 if (nchan != 1) 1063 printf(" %u-%u,%u", schan, schan + nchan-1, 1064 cie->band[i].maxtxpwr); 1065 else 1066 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 1067 } 1068 printf("]"); 1069} 1070 1071static void 1072dump_probe_beacon(uint8_t subtype, int isnew, 1073 const uint8_t mac[IEEE80211_ADDR_LEN], 1074 const struct ieee80211_scanparams *sp, int rssi) 1075{ 1076 1077 printf("[%s] %s%s on chan %u (bss chan %u) ", 1078 ether_sprintf(mac), isnew ? "new " : "", 1079 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], 1080 sp->chan, sp->bchan); 1081 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 1082 printf(" rssi %d\n", rssi); 1083 1084 if (isnew) { 1085 printf("[%s] caps 0x%x bintval %u erp 0x%x", 1086 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 1087 if (sp->country != NULL) 1088 dump_country(sp->country); 1089 printf("\n"); 1090 } 1091} 1092#endif /* IEEE80211_DEBUG */ 1093 1094/* 1095 * Process a beacon or probe response frame. 1096 */ 1097void 1098ieee80211_add_scan(struct ieee80211vap *vap, 1099 const struct ieee80211_scanparams *sp, 1100 const struct ieee80211_frame *wh, 1101 int subtype, int rssi, int noise) 1102{ 1103 struct ieee80211com *ic = vap->iv_ic; 1104 struct ieee80211_scan_state *ss = ic->ic_scan; 1105 1106 /* XXX locking */ 1107 /* 1108 * Frames received during startup are discarded to avoid 1109 * using scan state setup on the initial entry to the timer 1110 * callback. This can occur because the device may enable 1111 * rx prior to our doing the initial channel change in the 1112 * timer routine. 1113 */ 1114 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD) 1115 return; 1116#ifdef IEEE80211_DEBUG 1117 if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN)) 1118 dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi); 1119#endif 1120 if (ss->ss_ops != NULL && 1121 ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise)) { 1122 /* 1123 * If we've reached the min dwell time terminate 1124 * the timer so we'll switch to the next channel. 1125 */ 1126 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 && 1127 time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) { 1128 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1129 "%s: chan %3d%c min dwell met (%u > %lu)\n", 1130 __func__, 1131 ieee80211_chan2ieee(ic, ic->ic_curchan), 1132 channel_type(ic->ic_curchan), 1133 ticks, SCAN_PRIVATE(ss)->ss_chanmindwell); 1134 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL; 1135 /* 1136 * NB: trigger at next clock tick or wait for the 1137 * hardware. 1138 */ 1139 ic->ic_scan_mindwell(ss); 1140 } 1141 } 1142} 1143 1144/* 1145 * Timeout/age scan cache entries; called from sta timeout 1146 * timer (XXX should be self-contained). 1147 */ 1148void 1149ieee80211_scan_timeout(struct ieee80211com *ic) 1150{ 1151 struct ieee80211_scan_state *ss = ic->ic_scan; 1152 1153 if (ss->ss_ops != NULL) 1154 ss->ss_ops->scan_age(ss); 1155} 1156 1157/* 1158 * Mark a scan cache entry after a successful associate. 1159 */ 1160void 1161ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 1162{ 1163 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1164 1165 if (ss->ss_ops != NULL) { 1166 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 1167 mac, "%s", __func__); 1168 ss->ss_ops->scan_assoc_success(ss, mac); 1169 } 1170} 1171 1172/* 1173 * Demerit a scan cache entry after failing to associate. 1174 */ 1175void 1176ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 1177 const uint8_t mac[], int reason) 1178{ 1179 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1180 1181 if (ss->ss_ops != NULL) { 1182 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 1183 "%s: reason %u", __func__, reason); 1184 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 1185 } 1186} 1187 1188/* 1189 * Iterate over the contents of the scan cache. 1190 */ 1191void 1192ieee80211_scan_iterate(struct ieee80211vap *vap, 1193 ieee80211_scan_iter_func *f, void *arg) 1194{ 1195 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1196 1197 if (ss->ss_ops != NULL) 1198 ss->ss_ops->scan_iterate(ss, f, arg); 1199} 1200 1201/* 1202 * Flush the contents of the scan cache. 1203 */ 1204void 1205ieee80211_scan_flush(struct ieee80211vap *vap) 1206{ 1207 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1208 1209 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 1210 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 1211 ss->ss_ops->scan_flush(ss); 1212 } 1213} 1214 1215/* 1216 * Check the scan cache for an ap/channel to use; if that 1217 * fails then kick off a new scan. 1218 */ 1219struct ieee80211_channel * 1220ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 1221{ 1222 struct ieee80211_scan_state *ss = ic->ic_scan; 1223 1224 IEEE80211_LOCK_ASSERT(ic); 1225 1226 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 1227 /* XXX printf? */ 1228 return NULL; 1229 } 1230 if (ss->ss_ops->scan_pickchan == NULL) { 1231 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 1232 "%s: scan module does not support picking a channel, " 1233 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 1234 return NULL; 1235 } 1236 return ss->ss_ops->scan_pickchan(ss, flags); 1237} 1238