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("$FreeBSD$"); 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 "wlan_scan_sta", /* IEEE80211_M_MBSS */ 213}; 214static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 215 216const struct ieee80211_scanner * 217ieee80211_scanner_get(enum ieee80211_opmode mode) 218{ 219 if (mode >= IEEE80211_OPMODE_MAX) 220 return NULL; 221 if (scanners[mode] == NULL) 222 ieee80211_load_module(scan_modnames[mode]); 223 return scanners[mode]; 224} 225 226void 227ieee80211_scanner_register(enum ieee80211_opmode mode, 228 const struct ieee80211_scanner *scan) 229{ 230 if (mode >= IEEE80211_OPMODE_MAX) 231 return; 232 scanners[mode] = scan; 233} 234 235void 236ieee80211_scanner_unregister(enum ieee80211_opmode mode, 237 const struct ieee80211_scanner *scan) 238{ 239 if (mode >= IEEE80211_OPMODE_MAX) 240 return; 241 if (scanners[mode] == scan) 242 scanners[mode] = NULL; 243} 244 245void 246ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 247{ 248 int m; 249 250 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 251 if (scanners[m] == scan) 252 scanners[m] = NULL; 253} 254 255/* 256 * Update common scanner state to reflect the current 257 * operating mode. This is called when the state machine 258 * is transitioned to RUN state w/o scanning--e.g. when 259 * operating in monitor mode. The purpose of this is to 260 * ensure later callbacks find ss_ops set to properly 261 * reflect current operating mode. 262 */ 263static void 264scan_update_locked(struct ieee80211vap *vap, 265 const struct ieee80211_scanner *scan) 266{ 267 struct ieee80211com *ic = vap->iv_ic; 268 struct ieee80211_scan_state *ss = ic->ic_scan; 269 270 IEEE80211_LOCK_ASSERT(ic); 271 272#ifdef IEEE80211_DEBUG 273 if (ss->ss_vap != vap || ss->ss_ops != scan) { 274 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 275 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 276 __func__, 277 ss->ss_vap != NULL ? 278 ss->ss_vap->iv_ifp->if_xname : "none", 279 ss->ss_vap != NULL ? 280 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 281 vap->iv_ifp->if_xname, 282 ieee80211_opmode_name[vap->iv_opmode]); 283 } 284#endif 285 ss->ss_vap = vap; 286 if (ss->ss_ops != scan) { 287 /* 288 * Switch scanners; detach old, attach new. Special 289 * case where a single scan module implements multiple 290 * policies by using different scan ops but a common 291 * core. We assume if the old and new attach methods 292 * are identical then it's ok to just change ss_ops 293 * and not flush the internal state of the module. 294 */ 295 if (scan == NULL || ss->ss_ops == NULL || 296 ss->ss_ops->scan_attach != scan->scan_attach) { 297 if (ss->ss_ops != NULL) 298 ss->ss_ops->scan_detach(ss); 299 if (scan != NULL && !scan->scan_attach(ss)) { 300 /* XXX attach failure */ 301 /* XXX stat+msg */ 302 scan = NULL; 303 } 304 } 305 ss->ss_ops = scan; 306 } 307} 308 309static char 310channel_type(const struct ieee80211_channel *c) 311{ 312 if (IEEE80211_IS_CHAN_ST(c)) 313 return 'S'; 314 if (IEEE80211_IS_CHAN_108A(c)) 315 return 'T'; 316 if (IEEE80211_IS_CHAN_108G(c)) 317 return 'G'; 318 if (IEEE80211_IS_CHAN_HT(c)) 319 return 'n'; 320 if (IEEE80211_IS_CHAN_A(c)) 321 return 'a'; 322 if (IEEE80211_IS_CHAN_ANYG(c)) 323 return 'g'; 324 if (IEEE80211_IS_CHAN_B(c)) 325 return 'b'; 326 return 'f'; 327} 328 329void 330ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 331{ 332 struct ieee80211com *ic = ss->ss_ic; 333 const char *sep; 334 int i; 335 336 sep = ""; 337 for (i = ss->ss_next; i < ss->ss_last; i++) { 338 const struct ieee80211_channel *c = ss->ss_chans[i]; 339 340 printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 341 channel_type(c)); 342 sep = ", "; 343 } 344} 345 346#ifdef IEEE80211_DEBUG 347static void 348scan_dump(struct ieee80211_scan_state *ss) 349{ 350 struct ieee80211vap *vap = ss->ss_vap; 351 352 if_printf(vap->iv_ifp, "scan set "); 353 ieee80211_scan_dump_channels(ss); 354 printf(" dwell min %lums max %lums\n", 355 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 356} 357#endif /* IEEE80211_DEBUG */ 358 359static void 360copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 361 int nssid, const struct ieee80211_scan_ssid ssids[]) 362{ 363 if (nssid > IEEE80211_SCAN_MAX_SSID) { 364 /* XXX printf */ 365 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 366 "%s: too many ssid %d, ignoring all of them\n", 367 __func__, nssid); 368 return; 369 } 370 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 371 ss->ss_nssid = nssid; 372} 373 374/* 375 * Start a scan unless one is already going. 376 */ 377static int 378start_scan_locked(const struct ieee80211_scanner *scan, 379 struct ieee80211vap *vap, int flags, u_int duration, 380 u_int mindwell, u_int maxdwell, 381 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 382{ 383 struct ieee80211com *ic = vap->iv_ic; 384 struct ieee80211_scan_state *ss = ic->ic_scan; 385 386 IEEE80211_LOCK_ASSERT(ic); 387 388 if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 389 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 390 "%s: scan inhibited by pending channel change\n", __func__); 391 } else if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 392 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 393 "%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n" 394 , __func__ 395 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 396 , duration, mindwell, maxdwell 397 , ieee80211_phymode_name[vap->iv_des_mode] 398 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 399 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 400 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 401 , flags & IEEE80211_SCAN_NOBCAST ? ", nobcast" : "" 402 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 403 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 404 ); 405 406 scan_update_locked(vap, scan); 407 if (ss->ss_ops != NULL) { 408 if ((flags & IEEE80211_SCAN_NOSSID) == 0) 409 copy_ssid(vap, ss, nssid, ssids); 410 411 /* NB: top 4 bits for internal use */ 412 ss->ss_flags = flags & 0xfff; 413 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 414 vap->iv_stats.is_scan_active++; 415 else 416 vap->iv_stats.is_scan_passive++; 417 if (flags & IEEE80211_SCAN_FLUSH) 418 ss->ss_ops->scan_flush(ss); 419 if (flags & IEEE80211_SCAN_BGSCAN) 420 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN; 421 422 /* NB: flush frames rx'd before 1st channel change */ 423 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 424 SCAN_PRIVATE(ss)->ss_duration = duration; 425 ss->ss_next = 0; 426 ss->ss_mindwell = mindwell; 427 ss->ss_maxdwell = maxdwell; 428 /* NB: scan_start must be before the scan runtask */ 429 ss->ss_ops->scan_start(ss, vap); 430#ifdef IEEE80211_DEBUG 431 if (ieee80211_msg_scan(vap)) 432 scan_dump(ss); 433#endif /* IEEE80211_DEBUG */ 434 ic->ic_flags |= IEEE80211_F_SCAN; 435 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 436 } 437 return 1; 438 } else { 439 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 440 "%s: %s scan already in progress\n", __func__, 441 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 442 } 443 return 0; 444} 445 446/* 447 * Start a scan unless one is already going. 448 */ 449int 450ieee80211_start_scan(struct ieee80211vap *vap, int flags, 451 u_int duration, u_int mindwell, u_int maxdwell, 452 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 453{ 454 struct ieee80211com *ic = vap->iv_ic; 455 const struct ieee80211_scanner *scan; 456 int result; 457 458 scan = ieee80211_scanner_get(vap->iv_opmode); 459 if (scan == NULL) { 460 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 461 "%s: no scanner support for %s mode\n", 462 __func__, ieee80211_opmode_name[vap->iv_opmode]); 463 /* XXX stat */ 464 return 0; 465 } 466 467 IEEE80211_LOCK(ic); 468 result = start_scan_locked(scan, vap, flags, duration, 469 mindwell, maxdwell, nssid, ssids); 470 IEEE80211_UNLOCK(ic); 471 472 return result; 473} 474 475/* 476 * Check the scan cache for an ap/channel to use; if that 477 * fails then kick off a new scan. 478 */ 479int 480ieee80211_check_scan(struct ieee80211vap *vap, int flags, 481 u_int duration, u_int mindwell, u_int maxdwell, 482 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 483{ 484 struct ieee80211com *ic = vap->iv_ic; 485 struct ieee80211_scan_state *ss = ic->ic_scan; 486 const struct ieee80211_scanner *scan; 487 int result; 488 489 scan = ieee80211_scanner_get(vap->iv_opmode); 490 if (scan == NULL) { 491 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 492 "%s: no scanner support for %s mode\n", 493 __func__, vap->iv_opmode); 494 /* XXX stat */ 495 return 0; 496 } 497 498 /* 499 * Check if there's a list of scan candidates already. 500 * XXX want more than the ap we're currently associated with 501 */ 502 503 IEEE80211_LOCK(ic); 504 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 505 "%s: %s scan, %s%s%s%s%s\n" 506 , __func__ 507 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 508 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 509 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 510 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 511 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 512 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 513 ); 514 515 if (ss->ss_ops != scan) { 516 /* XXX re-use cache contents? e.g. adhoc<->sta */ 517 flags |= IEEE80211_SCAN_FLUSH; 518 } 519 scan_update_locked(vap, scan); 520 if (ss->ss_ops != NULL) { 521 /* XXX verify ss_ops matches vap->iv_opmode */ 522 if ((flags & IEEE80211_SCAN_NOSSID) == 0) { 523 /* 524 * Update the ssid list and mark flags so if 525 * we call start_scan it doesn't duplicate work. 526 */ 527 copy_ssid(vap, ss, nssid, ssids); 528 flags |= IEEE80211_SCAN_NOSSID; 529 } 530 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 531 (flags & IEEE80211_SCAN_FLUSH) == 0 && 532 time_before(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 533 /* 534 * We're not currently scanning and the cache is 535 * deemed hot enough to consult. Lock out others 536 * by marking IEEE80211_F_SCAN while we decide if 537 * something is already in the scan cache we can 538 * use. Also discard any frames that might come 539 * in while temporarily marked as scanning. 540 */ 541 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 542 ic->ic_flags |= IEEE80211_F_SCAN; 543 544 /* NB: need to use supplied flags in check */ 545 ss->ss_flags = flags & 0xff; 546 result = ss->ss_ops->scan_end(ss, vap); 547 548 ic->ic_flags &= ~IEEE80211_F_SCAN; 549 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD; 550 if (result) { 551 ieee80211_notify_scan_done(vap); 552 IEEE80211_UNLOCK(ic); 553 return 1; 554 } 555 } 556 } 557 result = start_scan_locked(scan, vap, flags, duration, 558 mindwell, maxdwell, nssid, ssids); 559 IEEE80211_UNLOCK(ic); 560 561 return result; 562} 563 564/* 565 * Check the scan cache for an ap/channel to use; if that fails 566 * then kick off a scan using the current settings. 567 */ 568int 569ieee80211_check_scan_current(struct ieee80211vap *vap) 570{ 571 return ieee80211_check_scan(vap, 572 IEEE80211_SCAN_ACTIVE, 573 IEEE80211_SCAN_FOREVER, 0, 0, 574 vap->iv_des_nssid, vap->iv_des_ssid); 575} 576 577/* 578 * Restart a previous scan. If the previous scan completed 579 * then we start again using the existing channel list. 580 */ 581int 582ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 583{ 584 struct ieee80211com *ic = vap->iv_ic; 585 struct ieee80211_scan_state *ss = ic->ic_scan; 586 const struct ieee80211_scanner *scan; 587 588 scan = ieee80211_scanner_get(vap->iv_opmode); 589 if (scan == NULL) { 590 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 591 "%s: no scanner support for %s mode\n", 592 __func__, vap->iv_opmode); 593 /* XXX stat */ 594 return 0; 595 } 596 597 IEEE80211_LOCK(ic); 598 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 599 u_int duration; 600 /* 601 * Go off-channel for a fixed interval that is large 602 * enough to catch most ap's but short enough that 603 * we can return on-channel before our listen interval 604 * expires. 605 */ 606 duration = IEEE80211_SCAN_OFFCHANNEL; 607 608 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 609 "%s: %s scan, ticks %u duration %lu\n", __func__, 610 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive", 611 ticks, duration); 612 613 scan_update_locked(vap, scan); 614 if (ss->ss_ops != NULL) { 615 ss->ss_vap = vap; 616 /* 617 * A background scan does not select a new sta; it 618 * just refreshes the scan cache. Also, indicate 619 * the scan logic should follow the beacon schedule: 620 * we go off-channel and scan for a while, then 621 * return to the bss channel to receive a beacon, 622 * then go off-channel again. All during this time 623 * we notify the ap we're in power save mode. When 624 * the scan is complete we leave power save mode. 625 * If any beacon indicates there are frames pending 626 * for us then we drop out of power save mode 627 * (and background scan) automatically by way of the 628 * usual sta power save logic. 629 */ 630 ss->ss_flags |= IEEE80211_SCAN_NOPICK 631 | IEEE80211_SCAN_BGSCAN 632 | flags 633 ; 634 /* if previous scan completed, restart */ 635 if (ss->ss_next >= ss->ss_last) { 636 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 637 vap->iv_stats.is_scan_active++; 638 else 639 vap->iv_stats.is_scan_passive++; 640 /* 641 * NB: beware of the scan cache being flushed; 642 * if the channel list is empty use the 643 * scan_start method to populate it. 644 */ 645 ss->ss_next = 0; 646 if (ss->ss_last != 0) 647 ss->ss_ops->scan_restart(ss, vap); 648 else { 649 ss->ss_ops->scan_start(ss, vap); 650#ifdef IEEE80211_DEBUG 651 if (ieee80211_msg_scan(vap)) 652 scan_dump(ss); 653#endif /* IEEE80211_DEBUG */ 654 } 655 } 656 /* NB: flush frames rx'd before 1st channel change */ 657 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 658 SCAN_PRIVATE(ss)->ss_duration = duration; 659 ss->ss_maxdwell = duration; 660 ic->ic_flags |= IEEE80211_F_SCAN; 661 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN; 662 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 663 } else { 664 /* XXX msg+stat */ 665 } 666 } else { 667 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 668 "%s: %s scan already in progress\n", __func__, 669 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 670 } 671 IEEE80211_UNLOCK(ic); 672 673 /* NB: racey, does it matter? */ 674 return (ic->ic_flags & IEEE80211_F_SCAN); 675} 676 677/* 678 * Cancel any scan currently going on for the specified vap. 679 */ 680void 681ieee80211_cancel_scan(struct ieee80211vap *vap) 682{ 683 struct ieee80211com *ic = vap->iv_ic; 684 struct ieee80211_scan_state *ss = ic->ic_scan; 685 686 IEEE80211_LOCK(ic); 687 if ((ic->ic_flags & IEEE80211_F_SCAN) && 688 ss->ss_vap == vap && 689 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 690 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 691 "%s: cancel %s scan\n", __func__, 692 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 693 "active" : "passive"); 694 695 /* clear bg scan NOPICK and mark cancel request */ 696 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 697 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 698 /* wake up the scan task */ 699 scan_signal(ss); 700 } 701 IEEE80211_UNLOCK(ic); 702} 703 704/* 705 * Cancel any scan currently going on. 706 */ 707void 708ieee80211_cancel_anyscan(struct ieee80211vap *vap) 709{ 710 struct ieee80211com *ic = vap->iv_ic; 711 struct ieee80211_scan_state *ss = ic->ic_scan; 712 713 IEEE80211_LOCK(ic); 714 if ((ic->ic_flags & IEEE80211_F_SCAN) && 715 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 716 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 717 "%s: cancel %s scan\n", __func__, 718 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 719 "active" : "passive"); 720 721 /* clear bg scan NOPICK and mark cancel request */ 722 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 723 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 724 /* wake up the scan task */ 725 scan_signal(ss); 726 } 727 IEEE80211_UNLOCK(ic); 728} 729 730/* 731 * Public access to scan_next for drivers that manage 732 * scanning themselves (e.g. for firmware-based devices). 733 */ 734void 735ieee80211_scan_next(struct ieee80211vap *vap) 736{ 737 struct ieee80211com *ic = vap->iv_ic; 738 struct ieee80211_scan_state *ss = ic->ic_scan; 739 740 /* wake up the scan task */ 741 IEEE80211_LOCK(ic); 742 scan_signal(ss); 743 IEEE80211_UNLOCK(ic); 744} 745 746/* 747 * Public access to scan_next for drivers that are not able to scan single 748 * channels (e.g. for firmware-based devices). 749 */ 750void 751ieee80211_scan_done(struct ieee80211vap *vap) 752{ 753 struct ieee80211com *ic = vap->iv_ic; 754 struct ieee80211_scan_state *ss; 755 756 IEEE80211_LOCK(ic); 757 ss = ic->ic_scan; 758 ss->ss_next = ss->ss_last; /* all channels are complete */ 759 scan_signal(ss); 760 IEEE80211_UNLOCK(ic); 761} 762 763/* 764 * Probe the curent channel, if allowed, while scanning. 765 * If the channel is not marked passive-only then send 766 * a probe request immediately. Otherwise mark state and 767 * listen for beacons on the channel; if we receive something 768 * then we'll transmit a probe request. 769 */ 770void 771ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 772{ 773 struct ieee80211com *ic = vap->iv_ic; 774 struct ieee80211_scan_state *ss = ic->ic_scan; 775 struct ifnet *ifp = vap->iv_ifp; 776 int i; 777 778 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 779 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 780 return; 781 } 782 /* 783 * Send directed probe requests followed by any 784 * broadcast probe request. 785 * XXX remove dependence on ic/vap->iv_bss 786 */ 787 for (i = 0; i < ss->ss_nssid; i++) 788 ieee80211_send_probereq(vap->iv_bss, 789 vap->iv_myaddr, ifp->if_broadcastaddr, 790 ifp->if_broadcastaddr, 791 ss->ss_ssid[i].ssid, ss->ss_ssid[i].len); 792 if ((ss->ss_flags & IEEE80211_SCAN_NOBCAST) == 0) 793 ieee80211_send_probereq(vap->iv_bss, 794 vap->iv_myaddr, ifp->if_broadcastaddr, 795 ifp->if_broadcastaddr, 796 "", 0); 797} 798 799/* 800 * Scan curchan. If this is an active scan and the channel 801 * is not marked passive then send probe request frame(s). 802 * Arrange for the channel change after maxdwell ticks. 803 */ 804static void 805scan_curchan(struct ieee80211_scan_state *ss, unsigned long maxdwell) 806{ 807 struct ieee80211vap *vap = ss->ss_vap; 808 809 IEEE80211_LOCK(vap->iv_ic); 810 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 811 ieee80211_probe_curchan(vap, 0); 812 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 813 maxdwell, scan_signal, ss); 814 IEEE80211_UNLOCK(vap->iv_ic); 815} 816 817static void 818scan_signal(void *arg) 819{ 820 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 821 822 IEEE80211_LOCK_ASSERT(ss->ss_ic); 823 824 cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv); 825} 826 827/* 828 * Handle mindwell requirements completed; initiate a channel 829 * change to the next channel asap. 830 */ 831static void 832scan_mindwell(struct ieee80211_scan_state *ss) 833{ 834 struct ieee80211com *ic = ss->ss_ic; 835 836 IEEE80211_LOCK(ic); 837 scan_signal(ss); 838 IEEE80211_UNLOCK(ic); 839} 840 841static void 842scan_task(void *arg, int pending) 843{ 844#define ISCAN_REP (ISCAN_MINDWELL | ISCAN_DISCARD) 845 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 846 struct ieee80211vap *vap = ss->ss_vap; 847 struct ieee80211com *ic = ss->ss_ic; 848 struct ieee80211_channel *chan; 849 unsigned long maxdwell, scanend; 850 int scandone = 0; 851 852 IEEE80211_LOCK(ic); 853 if (vap == NULL || (ic->ic_flags & IEEE80211_F_SCAN) == 0 || 854 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)) { 855 /* Cancelled before we started */ 856 goto done; 857 } 858 859 if (ss->ss_next == ss->ss_last) { 860 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 861 "%s: no channels to scan\n", __func__); 862 scandone = 1; 863 goto done; 864 } 865 866 if (vap->iv_opmode == IEEE80211_M_STA && 867 vap->iv_state == IEEE80211_S_RUN) { 868 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) { 869 /* Enable station power save mode */ 870 vap->iv_sta_ps(vap, 1); 871 /* 872 * Use an 1ms delay so the null data frame has a chance 873 * to go out. 874 * XXX Should use M_TXCB mechanism to eliminate this. 875 */ 876 cv_timedwait(&SCAN_PRIVATE(ss)->ss_scan_cv, 877 IEEE80211_LOCK_OBJ(ic), hz / 1000); 878 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 879 goto done; 880 } 881 } 882 883 scanend = ticks + SCAN_PRIVATE(ss)->ss_duration; 884 IEEE80211_UNLOCK(ic); 885 ic->ic_scan_start(ic); /* notify driver */ 886 IEEE80211_LOCK(ic); 887 888 for (;;) { 889 scandone = (ss->ss_next >= ss->ss_last) || 890 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0; 891 if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) || 892 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) || 893 time_after(ticks + ss->ss_mindwell, scanend)) 894 break; 895 896 chan = ss->ss_chans[ss->ss_next++]; 897 898 /* 899 * Watch for truncation due to the scan end time. 900 */ 901 if (time_after(ticks + ss->ss_maxdwell, scanend)) 902 maxdwell = scanend - ticks; 903 else 904 maxdwell = ss->ss_maxdwell; 905 906 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 907 "%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n", 908 __func__, 909 ieee80211_chan2ieee(ic, ic->ic_curchan), 910 channel_type(ic->ic_curchan), 911 ieee80211_chan2ieee(ic, chan), channel_type(chan), 912 (ss->ss_flags & IEEE80211_SCAN_ACTIVE) && 913 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ? 914 "active" : "passive", 915 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell)); 916 917 /* 918 * Potentially change channel and phy mode. 919 */ 920 ic->ic_curchan = chan; 921 ic->ic_rt = ieee80211_get_ratetable(chan); 922 IEEE80211_UNLOCK(ic); 923 /* 924 * Perform the channel change and scan unlocked so the driver 925 * may sleep. Once set_channel returns the hardware has 926 * completed the channel change. 927 */ 928 ic->ic_set_channel(ic); 929 ieee80211_radiotap_chan_change(ic); 930 931 /* 932 * Scan curchan. Drivers for "intelligent hardware" 933 * override ic_scan_curchan to tell the device to do 934 * the work. Otherwise we manage the work outselves; 935 * sending a probe request (as needed), and arming the 936 * timeout to switch channels after maxdwell ticks. 937 * 938 * scan_curchan should only pause for the time required to 939 * prepare/initiate the hardware for the scan (if at all), the 940 * below condvar is used to sleep for the channels dwell time 941 * and allows it to be signalled for abort. 942 */ 943 ic->ic_scan_curchan(ss, maxdwell); 944 IEEE80211_LOCK(ic); 945 946 SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell; 947 /* clear mindwell lock and initial channel change flush */ 948 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 949 950 if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT))) 951 continue; 952 953 /* Wait to be signalled to scan the next channel */ 954 cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv, IEEE80211_LOCK_OBJ(ic)); 955 } 956 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 957 goto done; 958 959 IEEE80211_UNLOCK(ic); 960 ic->ic_scan_end(ic); /* notify driver */ 961 IEEE80211_LOCK(ic); 962 963 /* 964 * Since a cancellation may have occured during one of the 965 * driver calls (whilst unlocked), update scandone. 966 */ 967 if (scandone == 0 && 968 ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0)) { 969 /* XXX printf? */ 970 if_printf(vap->iv_ifp, 971 "%s: OOPS! scan cancelled during driver call!\n", 972 __func__); 973 } 974 scandone |= ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0); 975 976 /* 977 * Record scan complete time. Note that we also do 978 * this when canceled so any background scan will 979 * not be restarted for a while. 980 */ 981 if (scandone) 982 ic->ic_lastscan = ticks; 983 /* return to the bss channel */ 984 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 985 ic->ic_curchan != ic->ic_bsschan) { 986 ieee80211_setupcurchan(ic, ic->ic_bsschan); 987 IEEE80211_UNLOCK(ic); 988 ic->ic_set_channel(ic); 989 ieee80211_radiotap_chan_change(ic); 990 IEEE80211_LOCK(ic); 991 } 992 /* clear internal flags and any indication of a pick */ 993 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 994 ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK; 995 996 /* 997 * If not canceled and scan completed, do post-processing. 998 * If the callback function returns 0, then it wants to 999 * continue/restart scanning. Unfortunately we needed to 1000 * notify the driver to end the scan above to avoid having 1001 * rx frames alter the scan candidate list. 1002 */ 1003 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 && 1004 !ss->ss_ops->scan_end(ss, vap) && 1005 (ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 && 1006 time_before(ticks + ss->ss_mindwell, scanend)) { 1007 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1008 "%s: done, restart " 1009 "[ticks %u, dwell min %lu scanend %lu]\n", 1010 __func__, 1011 ticks, ss->ss_mindwell, scanend); 1012 ss->ss_next = 0; /* reset to begining */ 1013 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 1014 vap->iv_stats.is_scan_active++; 1015 else 1016 vap->iv_stats.is_scan_passive++; 1017 1018 ss->ss_ops->scan_restart(ss, vap); /* XXX? */ 1019 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 1020 IEEE80211_UNLOCK(ic); 1021 return; 1022 } 1023 1024 /* past here, scandone is ``true'' if not in bg mode */ 1025 if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0) 1026 scandone = 1; 1027 1028 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1029 "%s: %s, [ticks %u, dwell min %lu scanend %lu]\n", 1030 __func__, scandone ? "done" : "stopped", 1031 ticks, ss->ss_mindwell, scanend); 1032 1033 /* 1034 * Clear the SCAN bit first in case frames are 1035 * pending on the station power save queue. If 1036 * we defer this then the dispatch of the frames 1037 * may generate a request to cancel scanning. 1038 */ 1039done: 1040 ic->ic_flags &= ~IEEE80211_F_SCAN; 1041 /* 1042 * Drop out of power save mode when a scan has 1043 * completed. If this scan was prematurely terminated 1044 * because it is a background scan then don't notify 1045 * the ap; we'll either return to scanning after we 1046 * receive the beacon frame or we'll drop out of power 1047 * save mode because the beacon indicates we have frames 1048 * waiting for us. 1049 */ 1050 if (scandone) { 1051 vap->iv_sta_ps(vap, 0); 1052 if (ss->ss_next >= ss->ss_last) { 1053 ieee80211_notify_scan_done(vap); 1054 ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN; 1055 } 1056 } 1057 SCAN_PRIVATE(ss)->ss_iflags &= ~(ISCAN_CANCEL|ISCAN_ABORT); 1058 ss->ss_flags &= ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST); 1059 IEEE80211_UNLOCK(ic); 1060#undef ISCAN_REP 1061} 1062 1063#ifdef IEEE80211_DEBUG 1064static void 1065dump_country(const uint8_t *ie) 1066{ 1067 const struct ieee80211_country_ie *cie = 1068 (const struct ieee80211_country_ie *) ie; 1069 int i, nbands, schan, nchan; 1070 1071 if (cie->len < 3) { 1072 printf(" <bogus country ie, len %d>", cie->len); 1073 return; 1074 } 1075 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 1076 nbands = (cie->len - 3) / sizeof(cie->band[0]); 1077 for (i = 0; i < nbands; i++) { 1078 schan = cie->band[i].schan; 1079 nchan = cie->band[i].nchan; 1080 if (nchan != 1) 1081 printf(" %u-%u,%u", schan, schan + nchan-1, 1082 cie->band[i].maxtxpwr); 1083 else 1084 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 1085 } 1086 printf("]"); 1087} 1088 1089static void 1090dump_probe_beacon(uint8_t subtype, int isnew, 1091 const uint8_t mac[IEEE80211_ADDR_LEN], 1092 const struct ieee80211_scanparams *sp, int rssi) 1093{ 1094 1095 printf("[%s] %s%s on chan %u (bss chan %u) ", 1096 ether_sprintf(mac), isnew ? "new " : "", 1097 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], 1098 sp->chan, sp->bchan); 1099 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 1100 printf(" rssi %d\n", rssi); 1101 1102 if (isnew) { 1103 printf("[%s] caps 0x%x bintval %u erp 0x%x", 1104 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 1105 if (sp->country != NULL) 1106 dump_country(sp->country); 1107 printf("\n"); 1108 } 1109} 1110#endif /* IEEE80211_DEBUG */ 1111 1112/* 1113 * Process a beacon or probe response frame. 1114 */ 1115void 1116ieee80211_add_scan(struct ieee80211vap *vap, 1117 const struct ieee80211_scanparams *sp, 1118 const struct ieee80211_frame *wh, 1119 int subtype, int rssi, int noise) 1120{ 1121 struct ieee80211com *ic = vap->iv_ic; 1122 struct ieee80211_scan_state *ss = ic->ic_scan; 1123 1124 /* XXX locking */ 1125 /* 1126 * Frames received during startup are discarded to avoid 1127 * using scan state setup on the initial entry to the timer 1128 * callback. This can occur because the device may enable 1129 * rx prior to our doing the initial channel change in the 1130 * timer routine. 1131 */ 1132 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD) 1133 return; 1134#ifdef IEEE80211_DEBUG 1135 if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN)) 1136 dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi); 1137#endif 1138 if (ss->ss_ops != NULL && 1139 ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise)) { 1140 /* 1141 * If we've reached the min dwell time terminate 1142 * the timer so we'll switch to the next channel. 1143 */ 1144 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 && 1145 time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) { 1146 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1147 "%s: chan %3d%c min dwell met (%u > %lu)\n", 1148 __func__, 1149 ieee80211_chan2ieee(ic, ic->ic_curchan), 1150 channel_type(ic->ic_curchan), 1151 ticks, SCAN_PRIVATE(ss)->ss_chanmindwell); 1152 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL; 1153 /* 1154 * NB: trigger at next clock tick or wait for the 1155 * hardware. 1156 */ 1157 ic->ic_scan_mindwell(ss); 1158 } 1159 } 1160} 1161 1162/* 1163 * Timeout/age scan cache entries; called from sta timeout 1164 * timer (XXX should be self-contained). 1165 */ 1166void 1167ieee80211_scan_timeout(struct ieee80211com *ic) 1168{ 1169 struct ieee80211_scan_state *ss = ic->ic_scan; 1170 1171 if (ss->ss_ops != NULL) 1172 ss->ss_ops->scan_age(ss); 1173} 1174 1175/* 1176 * Mark a scan cache entry after a successful associate. 1177 */ 1178void 1179ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 1180{ 1181 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1182 1183 if (ss->ss_ops != NULL) { 1184 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 1185 mac, "%s", __func__); 1186 ss->ss_ops->scan_assoc_success(ss, mac); 1187 } 1188} 1189 1190/* 1191 * Demerit a scan cache entry after failing to associate. 1192 */ 1193void 1194ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 1195 const uint8_t mac[], int reason) 1196{ 1197 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1198 1199 if (ss->ss_ops != NULL) { 1200 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 1201 "%s: reason %u", __func__, reason); 1202 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 1203 } 1204} 1205 1206/* 1207 * Iterate over the contents of the scan cache. 1208 */ 1209void 1210ieee80211_scan_iterate(struct ieee80211vap *vap, 1211 ieee80211_scan_iter_func *f, void *arg) 1212{ 1213 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1214 1215 if (ss->ss_ops != NULL) 1216 ss->ss_ops->scan_iterate(ss, f, arg); 1217} 1218 1219/* 1220 * Flush the contents of the scan cache. 1221 */ 1222void 1223ieee80211_scan_flush(struct ieee80211vap *vap) 1224{ 1225 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1226 1227 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 1228 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 1229 ss->ss_ops->scan_flush(ss); 1230 } 1231} 1232 1233/* 1234 * Check the scan cache for an ap/channel to use; if that 1235 * fails then kick off a new scan. 1236 */ 1237struct ieee80211_channel * 1238ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 1239{ 1240 struct ieee80211_scan_state *ss = ic->ic_scan; 1241 1242 IEEE80211_LOCK_ASSERT(ic); 1243 1244 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 1245 /* XXX printf? */ 1246 return NULL; 1247 } 1248 if (ss->ss_ops->scan_pickchan == NULL) { 1249 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 1250 "%s: scan module does not support picking a channel, " 1251 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 1252 return NULL; 1253 } 1254 return ss->ss_ops->scan_pickchan(ss, flags); 1255} 1256