ieee80211_scan.c revision 218085
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 218085 2011-01-30 11:23:59Z bschmidt $"); 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 } else { 438 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 439 "%s: %s scan already in progress\n", __func__, 440 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 441 } 442 return (ic->ic_flags & IEEE80211_F_SCAN); 443} 444 445/* 446 * Start a scan unless one is already going. 447 */ 448int 449ieee80211_start_scan(struct ieee80211vap *vap, int flags, 450 u_int duration, u_int mindwell, u_int maxdwell, 451 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 452{ 453 struct ieee80211com *ic = vap->iv_ic; 454 const struct ieee80211_scanner *scan; 455 int result; 456 457 scan = ieee80211_scanner_get(vap->iv_opmode); 458 if (scan == NULL) { 459 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 460 "%s: no scanner support for %s mode\n", 461 __func__, ieee80211_opmode_name[vap->iv_opmode]); 462 /* XXX stat */ 463 return 0; 464 } 465 466 IEEE80211_LOCK(ic); 467 result = start_scan_locked(scan, vap, flags, duration, 468 mindwell, maxdwell, nssid, ssids); 469 IEEE80211_UNLOCK(ic); 470 471 return result; 472} 473 474/* 475 * Check the scan cache for an ap/channel to use; if that 476 * fails then kick off a new scan. 477 */ 478int 479ieee80211_check_scan(struct ieee80211vap *vap, int flags, 480 u_int duration, u_int mindwell, u_int maxdwell, 481 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 482{ 483 struct ieee80211com *ic = vap->iv_ic; 484 struct ieee80211_scan_state *ss = ic->ic_scan; 485 const struct ieee80211_scanner *scan; 486 int result; 487 488 scan = ieee80211_scanner_get(vap->iv_opmode); 489 if (scan == NULL) { 490 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 491 "%s: no scanner support for %s mode\n", 492 __func__, vap->iv_opmode); 493 /* XXX stat */ 494 return 0; 495 } 496 497 /* 498 * Check if there's a list of scan candidates already. 499 * XXX want more than the ap we're currently associated with 500 */ 501 502 IEEE80211_LOCK(ic); 503 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 504 "%s: %s scan, %s%s%s%s%s\n" 505 , __func__ 506 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 507 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 508 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 509 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 510 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 511 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 512 ); 513 514 if (ss->ss_ops != scan) { 515 /* XXX re-use cache contents? e.g. adhoc<->sta */ 516 flags |= IEEE80211_SCAN_FLUSH; 517 } 518 scan_update_locked(vap, scan); 519 if (ss->ss_ops != NULL) { 520 /* XXX verify ss_ops matches vap->iv_opmode */ 521 if ((flags & IEEE80211_SCAN_NOSSID) == 0) { 522 /* 523 * Update the ssid list and mark flags so if 524 * we call start_scan it doesn't duplicate work. 525 */ 526 copy_ssid(vap, ss, nssid, ssids); 527 flags |= IEEE80211_SCAN_NOSSID; 528 } 529 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 530 (flags & IEEE80211_SCAN_FLUSH) == 0 && 531 time_before(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 532 /* 533 * We're not currently scanning and the cache is 534 * deemed hot enough to consult. Lock out others 535 * by marking IEEE80211_F_SCAN while we decide if 536 * something is already in the scan cache we can 537 * use. Also discard any frames that might come 538 * in while temporarily marked as scanning. 539 */ 540 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 541 ic->ic_flags |= IEEE80211_F_SCAN; 542 543 /* NB: need to use supplied flags in check */ 544 ss->ss_flags = flags & 0xff; 545 result = ss->ss_ops->scan_end(ss, vap); 546 547 ic->ic_flags &= ~IEEE80211_F_SCAN; 548 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD; 549 if (result) { 550 ieee80211_notify_scan_done(vap); 551 IEEE80211_UNLOCK(ic); 552 return 1; 553 } 554 } 555 } 556 result = start_scan_locked(scan, vap, flags, duration, 557 mindwell, maxdwell, nssid, ssids); 558 IEEE80211_UNLOCK(ic); 559 560 return result; 561} 562 563/* 564 * Check the scan cache for an ap/channel to use; if that fails 565 * then kick off a scan using the current settings. 566 */ 567int 568ieee80211_check_scan_current(struct ieee80211vap *vap) 569{ 570 return ieee80211_check_scan(vap, 571 IEEE80211_SCAN_ACTIVE, 572 IEEE80211_SCAN_FOREVER, 0, 0, 573 vap->iv_des_nssid, vap->iv_des_ssid); 574} 575 576/* 577 * Restart a previous scan. If the previous scan completed 578 * then we start again using the existing channel list. 579 */ 580int 581ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 582{ 583 struct ieee80211com *ic = vap->iv_ic; 584 struct ieee80211_scan_state *ss = ic->ic_scan; 585 const struct ieee80211_scanner *scan; 586 587 scan = ieee80211_scanner_get(vap->iv_opmode); 588 if (scan == NULL) { 589 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 590 "%s: no scanner support for %s mode\n", 591 __func__, vap->iv_opmode); 592 /* XXX stat */ 593 return 0; 594 } 595 596 IEEE80211_LOCK(ic); 597 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 598 u_int duration; 599 /* 600 * Go off-channel for a fixed interval that is large 601 * enough to catch most ap's but short enough that 602 * we can return on-channel before our listen interval 603 * expires. 604 */ 605 duration = IEEE80211_SCAN_OFFCHANNEL; 606 607 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 608 "%s: %s scan, ticks %u duration %lu\n", __func__, 609 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive", 610 ticks, duration); 611 612 scan_update_locked(vap, scan); 613 if (ss->ss_ops != NULL) { 614 ss->ss_vap = vap; 615 /* 616 * A background scan does not select a new sta; it 617 * just refreshes the scan cache. Also, indicate 618 * the scan logic should follow the beacon schedule: 619 * we go off-channel and scan for a while, then 620 * return to the bss channel to receive a beacon, 621 * then go off-channel again. All during this time 622 * we notify the ap we're in power save mode. When 623 * the scan is complete we leave power save mode. 624 * If any beacon indicates there are frames pending 625 * for us then we drop out of power save mode 626 * (and background scan) automatically by way of the 627 * usual sta power save logic. 628 */ 629 ss->ss_flags |= IEEE80211_SCAN_NOPICK 630 | IEEE80211_SCAN_BGSCAN 631 | flags 632 ; 633 /* if previous scan completed, restart */ 634 if (ss->ss_next >= ss->ss_last) { 635 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 636 vap->iv_stats.is_scan_active++; 637 else 638 vap->iv_stats.is_scan_passive++; 639 /* 640 * NB: beware of the scan cache being flushed; 641 * if the channel list is empty use the 642 * scan_start method to populate it. 643 */ 644 ss->ss_next = 0; 645 if (ss->ss_last != 0) 646 ss->ss_ops->scan_restart(ss, vap); 647 else { 648 ss->ss_ops->scan_start(ss, vap); 649#ifdef IEEE80211_DEBUG 650 if (ieee80211_msg_scan(vap)) 651 scan_dump(ss); 652#endif /* IEEE80211_DEBUG */ 653 } 654 } 655 /* NB: flush frames rx'd before 1st channel change */ 656 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 657 SCAN_PRIVATE(ss)->ss_duration = duration; 658 ss->ss_maxdwell = duration; 659 ic->ic_flags |= IEEE80211_F_SCAN; 660 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN; 661 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 662 } else { 663 /* XXX msg+stat */ 664 } 665 } else { 666 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 667 "%s: %s scan already in progress\n", __func__, 668 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 669 } 670 IEEE80211_UNLOCK(ic); 671 672 /* NB: racey, does it matter? */ 673 return (ic->ic_flags & IEEE80211_F_SCAN); 674} 675 676/* 677 * Cancel any scan currently going on for the specified vap. 678 */ 679void 680ieee80211_cancel_scan(struct ieee80211vap *vap) 681{ 682 struct ieee80211com *ic = vap->iv_ic; 683 struct ieee80211_scan_state *ss = ic->ic_scan; 684 685 IEEE80211_LOCK(ic); 686 if ((ic->ic_flags & IEEE80211_F_SCAN) && 687 ss->ss_vap == vap && 688 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 689 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 690 "%s: cancel %s scan\n", __func__, 691 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 692 "active" : "passive"); 693 694 /* clear bg scan NOPICK and mark cancel request */ 695 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 696 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 697 /* wake up the scan task */ 698 scan_signal(ss); 699 } 700 IEEE80211_UNLOCK(ic); 701} 702 703/* 704 * Cancel any scan currently going on. 705 */ 706void 707ieee80211_cancel_anyscan(struct ieee80211vap *vap) 708{ 709 struct ieee80211com *ic = vap->iv_ic; 710 struct ieee80211_scan_state *ss = ic->ic_scan; 711 712 IEEE80211_LOCK(ic); 713 if ((ic->ic_flags & IEEE80211_F_SCAN) && 714 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 715 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 716 "%s: cancel %s scan\n", __func__, 717 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 718 "active" : "passive"); 719 720 /* clear bg scan NOPICK and mark cancel request */ 721 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 722 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 723 /* wake up the scan task */ 724 scan_signal(ss); 725 } 726 IEEE80211_UNLOCK(ic); 727} 728 729/* 730 * Public access to scan_next for drivers that manage 731 * scanning themselves (e.g. for firmware-based devices). 732 */ 733void 734ieee80211_scan_next(struct ieee80211vap *vap) 735{ 736 struct ieee80211com *ic = vap->iv_ic; 737 struct ieee80211_scan_state *ss = ic->ic_scan; 738 739 /* wake up the scan task */ 740 IEEE80211_LOCK(ic); 741 scan_signal(ss); 742 IEEE80211_UNLOCK(ic); 743} 744 745/* 746 * Public access to scan_next for drivers that are not able to scan single 747 * channels (e.g. for firmware-based devices). 748 */ 749void 750ieee80211_scan_done(struct ieee80211vap *vap) 751{ 752 struct ieee80211com *ic = vap->iv_ic; 753 struct ieee80211_scan_state *ss; 754 755 IEEE80211_LOCK(ic); 756 ss = ic->ic_scan; 757 ss->ss_next = ss->ss_last; /* all channels are complete */ 758 scan_signal(ss); 759 IEEE80211_UNLOCK(ic); 760} 761 762/* 763 * Probe the curent channel, if allowed, while scanning. 764 * If the channel is not marked passive-only then send 765 * a probe request immediately. Otherwise mark state and 766 * listen for beacons on the channel; if we receive something 767 * then we'll transmit a probe request. 768 */ 769void 770ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 771{ 772 struct ieee80211com *ic = vap->iv_ic; 773 struct ieee80211_scan_state *ss = ic->ic_scan; 774 struct ifnet *ifp = vap->iv_ifp; 775 int i; 776 777 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 778 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 779 return; 780 } 781 /* 782 * Send directed probe requests followed by any 783 * broadcast probe request. 784 * XXX remove dependence on ic/vap->iv_bss 785 */ 786 for (i = 0; i < ss->ss_nssid; i++) 787 ieee80211_send_probereq(vap->iv_bss, 788 vap->iv_myaddr, ifp->if_broadcastaddr, 789 ifp->if_broadcastaddr, 790 ss->ss_ssid[i].ssid, ss->ss_ssid[i].len); 791 if ((ss->ss_flags & IEEE80211_SCAN_NOBCAST) == 0) 792 ieee80211_send_probereq(vap->iv_bss, 793 vap->iv_myaddr, ifp->if_broadcastaddr, 794 ifp->if_broadcastaddr, 795 "", 0); 796} 797 798/* 799 * Scan curchan. If this is an active scan and the channel 800 * is not marked passive then send probe request frame(s). 801 * Arrange for the channel change after maxdwell ticks. 802 */ 803static void 804scan_curchan(struct ieee80211_scan_state *ss, unsigned long maxdwell) 805{ 806 struct ieee80211vap *vap = ss->ss_vap; 807 808 IEEE80211_LOCK(vap->iv_ic); 809 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 810 ieee80211_probe_curchan(vap, 0); 811 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 812 maxdwell, scan_signal, ss); 813 IEEE80211_UNLOCK(vap->iv_ic); 814} 815 816static void 817scan_signal(void *arg) 818{ 819 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 820 821 IEEE80211_LOCK_ASSERT(ss->ss_ic); 822 823 cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv); 824} 825 826/* 827 * Handle mindwell requirements completed; initiate a channel 828 * change to the next channel asap. 829 */ 830static void 831scan_mindwell(struct ieee80211_scan_state *ss) 832{ 833 struct ieee80211com *ic = ss->ss_ic; 834 835 IEEE80211_LOCK(ic); 836 scan_signal(ss); 837 IEEE80211_UNLOCK(ic); 838} 839 840static void 841scan_task(void *arg, int pending) 842{ 843#define ISCAN_REP (ISCAN_MINDWELL | ISCAN_DISCARD) 844 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 845 struct ieee80211vap *vap = ss->ss_vap; 846 struct ieee80211com *ic = ss->ss_ic; 847 struct ieee80211_channel *chan; 848 unsigned long maxdwell, scanend; 849 int scandone = 0; 850 851 IEEE80211_LOCK(ic); 852 if (vap == NULL || (ic->ic_flags & IEEE80211_F_SCAN) == 0 || 853 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)) { 854 /* Cancelled before we started */ 855 goto done; 856 } 857 858 if (ss->ss_next == ss->ss_last) { 859 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 860 "%s: no channels to scan\n", __func__); 861 goto done; 862 } 863 864 if (vap->iv_opmode == IEEE80211_M_STA && 865 vap->iv_state == IEEE80211_S_RUN) { 866 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) { 867 /* Enable station power save mode */ 868 ieee80211_sta_pwrsave(vap, 1); 869 /* 870 * Use an 1ms delay so the null data frame has a chance 871 * to go out. 872 * XXX Should use M_TXCB mechanism to eliminate this. 873 */ 874 cv_timedwait(&SCAN_PRIVATE(ss)->ss_scan_cv, 875 IEEE80211_LOCK_OBJ(ic), hz / 1000); 876 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 877 goto done; 878 } 879 } 880 881 scanend = ticks + SCAN_PRIVATE(ss)->ss_duration; 882 IEEE80211_UNLOCK(ic); 883 ic->ic_scan_start(ic); /* notify driver */ 884 IEEE80211_LOCK(ic); 885 886 for (;;) { 887 scandone = (ss->ss_next >= ss->ss_last) || 888 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0; 889 if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) || 890 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) || 891 time_after(ticks + ss->ss_mindwell, scanend)) 892 break; 893 894 chan = ss->ss_chans[ss->ss_next++]; 895 896 /* 897 * Watch for truncation due to the scan end time. 898 */ 899 if (time_after(ticks + ss->ss_maxdwell, scanend)) 900 maxdwell = scanend - ticks; 901 else 902 maxdwell = ss->ss_maxdwell; 903 904 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 905 "%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n", 906 __func__, 907 ieee80211_chan2ieee(ic, ic->ic_curchan), 908 channel_type(ic->ic_curchan), 909 ieee80211_chan2ieee(ic, chan), channel_type(chan), 910 (ss->ss_flags & IEEE80211_SCAN_ACTIVE) && 911 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ? 912 "active" : "passive", 913 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell)); 914 915 /* 916 * Potentially change channel and phy mode. 917 */ 918 ic->ic_curchan = chan; 919 ic->ic_rt = ieee80211_get_ratetable(chan); 920 IEEE80211_UNLOCK(ic); 921 /* 922 * Perform the channel change and scan unlocked so the driver 923 * may sleep. Once set_channel returns the hardware has 924 * completed the channel change. 925 */ 926 ic->ic_set_channel(ic); 927 ieee80211_radiotap_chan_change(ic); 928 929 /* 930 * Scan curchan. Drivers for "intelligent hardware" 931 * override ic_scan_curchan to tell the device to do 932 * the work. Otherwise we manage the work outselves; 933 * sending a probe request (as needed), and arming the 934 * timeout to switch channels after maxdwell ticks. 935 * 936 * scan_curchan should only pause for the time required to 937 * prepare/initiate the hardware for the scan (if at all), the 938 * below condvar is used to sleep for the channels dwell time 939 * and allows it to be signalled for abort. 940 */ 941 ic->ic_scan_curchan(ss, maxdwell); 942 IEEE80211_LOCK(ic); 943 944 SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell; 945 /* clear mindwell lock and initial channel change flush */ 946 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 947 948 if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT))) 949 continue; 950 951 /* Wait to be signalled to scan the next channel */ 952 cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv, IEEE80211_LOCK_OBJ(ic)); 953 } 954 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 955 goto done; 956 957 IEEE80211_UNLOCK(ic); 958 ic->ic_scan_end(ic); /* notify driver */ 959 IEEE80211_LOCK(ic); 960 961 /* 962 * Record scan complete time. Note that we also do 963 * this when canceled so any background scan will 964 * not be restarted for a while. 965 */ 966 if (scandone) 967 ic->ic_lastscan = ticks; 968 /* return to the bss channel */ 969 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 970 ic->ic_curchan != ic->ic_bsschan) { 971 ieee80211_setupcurchan(ic, ic->ic_bsschan); 972 IEEE80211_UNLOCK(ic); 973 ic->ic_set_channel(ic); 974 ieee80211_radiotap_chan_change(ic); 975 IEEE80211_LOCK(ic); 976 } 977 /* clear internal flags and any indication of a pick */ 978 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 979 ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK; 980 981 /* 982 * If not canceled and scan completed, do post-processing. 983 * If the callback function returns 0, then it wants to 984 * continue/restart scanning. Unfortunately we needed to 985 * notify the driver to end the scan above to avoid having 986 * rx frames alter the scan candidate list. 987 */ 988 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 && 989 !ss->ss_ops->scan_end(ss, vap) && 990 (ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 && 991 time_before(ticks + ss->ss_mindwell, scanend)) { 992 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 993 "%s: done, restart " 994 "[ticks %u, dwell min %lu scanend %lu]\n", 995 __func__, 996 ticks, ss->ss_mindwell, scanend); 997 ss->ss_next = 0; /* reset to begining */ 998 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 999 vap->iv_stats.is_scan_active++; 1000 else 1001 vap->iv_stats.is_scan_passive++; 1002 1003 ss->ss_ops->scan_restart(ss, vap); /* XXX? */ 1004 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 1005 IEEE80211_UNLOCK(ic); 1006 return; 1007 } 1008 1009 /* past here, scandone is ``true'' if not in bg mode */ 1010 if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0) 1011 scandone = 1; 1012 1013 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1014 "%s: %s, [ticks %u, dwell min %lu scanend %lu]\n", 1015 __func__, scandone ? "done" : "stopped", 1016 ticks, ss->ss_mindwell, scanend); 1017 1018 /* 1019 * Clear the SCAN bit first in case frames are 1020 * pending on the station power save queue. If 1021 * we defer this then the dispatch of the frames 1022 * may generate a request to cancel scanning. 1023 */ 1024done: 1025 ic->ic_flags &= ~IEEE80211_F_SCAN; 1026 /* 1027 * Drop out of power save mode when a scan has 1028 * completed. If this scan was prematurely terminated 1029 * because it is a background scan then don't notify 1030 * the ap; we'll either return to scanning after we 1031 * receive the beacon frame or we'll drop out of power 1032 * save mode because the beacon indicates we have frames 1033 * waiting for us. 1034 */ 1035 if (scandone) { 1036 ieee80211_sta_pwrsave(vap, 0); 1037 if (ss->ss_next >= ss->ss_last) { 1038 ieee80211_notify_scan_done(vap); 1039 ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN; 1040 } 1041 } 1042 SCAN_PRIVATE(ss)->ss_iflags &= ~(ISCAN_CANCEL|ISCAN_ABORT); 1043 ss->ss_flags &= ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST); 1044 IEEE80211_UNLOCK(ic); 1045#undef ISCAN_REP 1046} 1047 1048#ifdef IEEE80211_DEBUG 1049static void 1050dump_country(const uint8_t *ie) 1051{ 1052 const struct ieee80211_country_ie *cie = 1053 (const struct ieee80211_country_ie *) ie; 1054 int i, nbands, schan, nchan; 1055 1056 if (cie->len < 3) { 1057 printf(" <bogus country ie, len %d>", cie->len); 1058 return; 1059 } 1060 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 1061 nbands = (cie->len - 3) / sizeof(cie->band[0]); 1062 for (i = 0; i < nbands; i++) { 1063 schan = cie->band[i].schan; 1064 nchan = cie->band[i].nchan; 1065 if (nchan != 1) 1066 printf(" %u-%u,%u", schan, schan + nchan-1, 1067 cie->band[i].maxtxpwr); 1068 else 1069 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 1070 } 1071 printf("]"); 1072} 1073 1074static void 1075dump_probe_beacon(uint8_t subtype, int isnew, 1076 const uint8_t mac[IEEE80211_ADDR_LEN], 1077 const struct ieee80211_scanparams *sp, int rssi) 1078{ 1079 1080 printf("[%s] %s%s on chan %u (bss chan %u) ", 1081 ether_sprintf(mac), isnew ? "new " : "", 1082 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], 1083 sp->chan, sp->bchan); 1084 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 1085 printf(" rssi %d\n", rssi); 1086 1087 if (isnew) { 1088 printf("[%s] caps 0x%x bintval %u erp 0x%x", 1089 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 1090 if (sp->country != NULL) 1091 dump_country(sp->country); 1092 printf("\n"); 1093 } 1094} 1095#endif /* IEEE80211_DEBUG */ 1096 1097/* 1098 * Process a beacon or probe response frame. 1099 */ 1100void 1101ieee80211_add_scan(struct ieee80211vap *vap, 1102 const struct ieee80211_scanparams *sp, 1103 const struct ieee80211_frame *wh, 1104 int subtype, int rssi, int noise) 1105{ 1106 struct ieee80211com *ic = vap->iv_ic; 1107 struct ieee80211_scan_state *ss = ic->ic_scan; 1108 1109 /* XXX locking */ 1110 /* 1111 * Frames received during startup are discarded to avoid 1112 * using scan state setup on the initial entry to the timer 1113 * callback. This can occur because the device may enable 1114 * rx prior to our doing the initial channel change in the 1115 * timer routine. 1116 */ 1117 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD) 1118 return; 1119#ifdef IEEE80211_DEBUG 1120 if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN)) 1121 dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi); 1122#endif 1123 if (ss->ss_ops != NULL && 1124 ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise)) { 1125 /* 1126 * If we've reached the min dwell time terminate 1127 * the timer so we'll switch to the next channel. 1128 */ 1129 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 && 1130 time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) { 1131 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1132 "%s: chan %3d%c min dwell met (%u > %lu)\n", 1133 __func__, 1134 ieee80211_chan2ieee(ic, ic->ic_curchan), 1135 channel_type(ic->ic_curchan), 1136 ticks, SCAN_PRIVATE(ss)->ss_chanmindwell); 1137 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL; 1138 /* 1139 * NB: trigger at next clock tick or wait for the 1140 * hardware. 1141 */ 1142 ic->ic_scan_mindwell(ss); 1143 } 1144 } 1145} 1146 1147/* 1148 * Timeout/age scan cache entries; called from sta timeout 1149 * timer (XXX should be self-contained). 1150 */ 1151void 1152ieee80211_scan_timeout(struct ieee80211com *ic) 1153{ 1154 struct ieee80211_scan_state *ss = ic->ic_scan; 1155 1156 if (ss->ss_ops != NULL) 1157 ss->ss_ops->scan_age(ss); 1158} 1159 1160/* 1161 * Mark a scan cache entry after a successful associate. 1162 */ 1163void 1164ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 1165{ 1166 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1167 1168 if (ss->ss_ops != NULL) { 1169 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 1170 mac, "%s", __func__); 1171 ss->ss_ops->scan_assoc_success(ss, mac); 1172 } 1173} 1174 1175/* 1176 * Demerit a scan cache entry after failing to associate. 1177 */ 1178void 1179ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 1180 const uint8_t mac[], int reason) 1181{ 1182 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1183 1184 if (ss->ss_ops != NULL) { 1185 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 1186 "%s: reason %u", __func__, reason); 1187 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 1188 } 1189} 1190 1191/* 1192 * Iterate over the contents of the scan cache. 1193 */ 1194void 1195ieee80211_scan_iterate(struct ieee80211vap *vap, 1196 ieee80211_scan_iter_func *f, void *arg) 1197{ 1198 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1199 1200 if (ss->ss_ops != NULL) 1201 ss->ss_ops->scan_iterate(ss, f, arg); 1202} 1203 1204/* 1205 * Flush the contents of the scan cache. 1206 */ 1207void 1208ieee80211_scan_flush(struct ieee80211vap *vap) 1209{ 1210 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1211 1212 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 1213 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 1214 ss->ss_ops->scan_flush(ss); 1215 } 1216} 1217 1218/* 1219 * Check the scan cache for an ap/channel to use; if that 1220 * fails then kick off a new scan. 1221 */ 1222struct ieee80211_channel * 1223ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 1224{ 1225 struct ieee80211_scan_state *ss = ic->ic_scan; 1226 1227 IEEE80211_LOCK_ASSERT(ic); 1228 1229 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 1230 /* XXX printf? */ 1231 return NULL; 1232 } 1233 if (ss->ss_ops->scan_pickchan == NULL) { 1234 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 1235 "%s: scan module does not support picking a channel, " 1236 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 1237 return NULL; 1238 } 1239 return ss->ss_ops->scan_pickchan(ss, flags); 1240} 1241