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 * $FreeBSD: head/sys/net80211/ieee80211_scan.c 195618 2009-07-11 15:02:45Z rpaulo $ 26 * $DragonFly$ 27 */ 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 39 #include <sys/condvar.h> 40 #include <sys/socket.h> 41 42 #include <net/if.h> 43 #include <net/if_media.h> 44 #include <net/ethernet.h> 45 #include <net/route.h> 46 47 #include <netproto/802_11/ieee80211_var.h> 48 49 #include <net/bpf.h> 50 51 struct scan_state { 52 struct ieee80211_scan_state base; /* public state */ 53 54 u_int ss_iflags; /* flags used internally */ 55 #define ISCAN_MINDWELL 0x0001 /* min dwell time reached */ 56 #define ISCAN_DISCARD 0x0002 /* discard rx'd frames */ 57 #define ISCAN_CANCEL 0x0004 /* cancel current scan */ 58 #define ISCAN_ABORT 0x0008 /* end the scan immediately */ 59 unsigned long ss_chanmindwell; /* min dwell on curchan */ 60 unsigned long ss_scanend; /* time scan must stop */ 61 u_int ss_duration; /* duration for next scan */ 62 struct task ss_scan_task; /* scan execution */ 63 struct cv ss_scan_cv; /* scan signal */ 64 struct callout ss_scan_timer; /* scan timer */ 65 }; 66 #define SCAN_PRIVATE(ss) ((struct scan_state *) ss) 67 68 /* 69 * Amount of time to go off-channel during a background 70 * scan. This value should be large enough to catch most 71 * ap's but short enough that we can return on-channel 72 * before our listen interval expires. 73 * 74 * XXX tunable 75 * XXX check against configured listen interval 76 */ 77 #define IEEE80211_SCAN_OFFCHANNEL msecs_to_ticks(150) 78 79 /* 80 * Roaming-related defaults. RSSI thresholds are as returned by the 81 * driver (.5dBm). Transmit rate thresholds are IEEE rate codes (i.e 82 * .5M units) or MCS. 83 */ 84 /* rssi thresholds */ 85 #define ROAM_RSSI_11A_DEFAULT 14 /* 11a bss */ 86 #define ROAM_RSSI_11B_DEFAULT 14 /* 11b bss */ 87 #define ROAM_RSSI_11BONLY_DEFAULT 14 /* 11b-only bss */ 88 /* transmit rate thresholds */ 89 #define ROAM_RATE_11A_DEFAULT 2*12 /* 11a bss */ 90 #define ROAM_RATE_11B_DEFAULT 2*5 /* 11b bss */ 91 #define ROAM_RATE_11BONLY_DEFAULT 2*1 /* 11b-only bss */ 92 #define ROAM_RATE_HALF_DEFAULT 2*6 /* half-width 11a/g bss */ 93 #define ROAM_RATE_QUARTER_DEFAULT 2*3 /* quarter-width 11a/g bss */ 94 #define ROAM_MCS_11N_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11n bss */ 95 96 static void scan_curchan(struct ieee80211_scan_state *, unsigned long); 97 static void scan_mindwell(struct ieee80211_scan_state *); 98 static void scan_signal(void *); 99 static void scan_task(void *, int); 100 101 MALLOC_DEFINE(M_80211_SCAN, "80211scan", "802.11 scan state"); 102 103 void 104 ieee80211_scan_attach(struct ieee80211com *ic) 105 { 106 struct scan_state *ss; 107 108 ss = (struct scan_state *) kmalloc(sizeof(struct scan_state), 109 M_80211_SCAN, M_INTWAIT | M_ZERO); 110 if (ss == NULL) { 111 ic->ic_scan = NULL; 112 return; 113 } 114 cv_init(&ss->ss_scan_cv, "scan"); 115 callout_init(&ss->ss_scan_timer); 116 TASK_INIT(&ss->ss_scan_task, 0, scan_task, ss); 117 ic->ic_scan = &ss->base; 118 ss->base.ss_ic = ic; 119 120 ic->ic_scan_curchan = scan_curchan; 121 ic->ic_scan_mindwell = scan_mindwell; 122 } 123 124 void 125 ieee80211_scan_detach(struct ieee80211com *ic) 126 { 127 struct ieee80211_scan_state *ss = ic->ic_scan; 128 129 if (ss != NULL) { 130 IEEE80211_LOCK(ic); 131 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT; 132 scan_signal(ss); 133 IEEE80211_UNLOCK(ic); 134 ieee80211_draintask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 135 callout_stop(&SCAN_PRIVATE(ss)->ss_scan_timer); 136 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, 137 ("scan still running")); 138 if (ss->ss_ops != NULL) { 139 ss->ss_ops->scan_detach(ss); 140 ss->ss_ops = NULL; 141 } 142 ic->ic_scan = NULL; 143 kfree(SCAN_PRIVATE(ss), M_80211_SCAN); 144 } 145 } 146 147 static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = { 148 [IEEE80211_MODE_11A] = { .rssi = ROAM_RSSI_11A_DEFAULT, 149 .rate = ROAM_RATE_11A_DEFAULT }, 150 [IEEE80211_MODE_11G] = { .rssi = ROAM_RSSI_11B_DEFAULT, 151 .rate = ROAM_RATE_11B_DEFAULT }, 152 [IEEE80211_MODE_11B] = { .rssi = ROAM_RSSI_11BONLY_DEFAULT, 153 .rate = ROAM_RATE_11BONLY_DEFAULT }, 154 [IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT, 155 .rate = ROAM_RATE_11A_DEFAULT }, 156 [IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT, 157 .rate = ROAM_RATE_11A_DEFAULT }, 158 [IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT, 159 .rate = ROAM_RATE_11A_DEFAULT }, 160 [IEEE80211_MODE_HALF] = { .rssi = ROAM_RSSI_11A_DEFAULT, 161 .rate = ROAM_RATE_HALF_DEFAULT }, 162 [IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT, 163 .rate = ROAM_RATE_QUARTER_DEFAULT }, 164 [IEEE80211_MODE_11NA] = { .rssi = ROAM_RSSI_11A_DEFAULT, 165 .rate = ROAM_MCS_11N_DEFAULT }, 166 [IEEE80211_MODE_11NG] = { .rssi = ROAM_RSSI_11B_DEFAULT, 167 .rate = ROAM_MCS_11N_DEFAULT }, 168 }; 169 170 void 171 ieee80211_scan_vattach(struct ieee80211vap *vap) 172 { 173 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz; 174 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz; 175 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz; 176 177 vap->iv_roaming = IEEE80211_ROAMING_AUTO; 178 memcpy(vap->iv_roamparms, defroam, sizeof(defroam)); 179 } 180 181 void 182 ieee80211_scan_vdetach(struct ieee80211vap *vap) 183 { 184 struct ieee80211com *ic = vap->iv_ic; 185 struct ieee80211_scan_state *ss; 186 187 IEEE80211_LOCK(ic); 188 ss = ic->ic_scan; 189 if (ss != NULL && ss->ss_vap == vap) { 190 if (ic->ic_flags & IEEE80211_F_SCAN) { 191 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT; 192 scan_signal(ss); 193 } 194 if (ss->ss_ops != NULL) { 195 ss->ss_ops->scan_detach(ss); 196 ss->ss_ops = NULL; 197 } 198 ss->ss_vap = NULL; 199 } 200 IEEE80211_UNLOCK(ic); 201 } 202 203 /* 204 * Simple-minded scanner module support. 205 */ 206 static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 207 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 208 "wlan_scan_sta", /* IEEE80211_M_STA */ 209 "wlan_scan_wds", /* IEEE80211_M_WDS */ 210 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 211 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 212 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 213 "wlan_scan_sta", /* IEEE80211_M_MBSS */ 214 }; 215 static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 216 217 const struct ieee80211_scanner * 218 ieee80211_scanner_get(enum ieee80211_opmode mode) 219 { 220 if (mode >= IEEE80211_OPMODE_MAX) 221 return NULL; 222 if (scanners[mode] == NULL) 223 ieee80211_load_module(scan_modnames[mode]); 224 return scanners[mode]; 225 } 226 227 void 228 ieee80211_scanner_register(enum ieee80211_opmode mode, 229 const struct ieee80211_scanner *scan) 230 { 231 if (mode >= IEEE80211_OPMODE_MAX) 232 return; 233 scanners[mode] = scan; 234 } 235 236 void 237 ieee80211_scanner_unregister(enum ieee80211_opmode mode, 238 const struct ieee80211_scanner *scan) 239 { 240 if (mode >= IEEE80211_OPMODE_MAX) 241 return; 242 if (scanners[mode] == scan) 243 scanners[mode] = NULL; 244 } 245 246 void 247 ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 248 { 249 int m; 250 251 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 252 if (scanners[m] == scan) 253 scanners[m] = NULL; 254 } 255 256 /* 257 * Update common scanner state to reflect the current 258 * operating mode. This is called when the state machine 259 * is transitioned to RUN state w/o scanning--e.g. when 260 * operating in monitor mode. The purpose of this is to 261 * ensure later callbacks find ss_ops set to properly 262 * reflect current operating mode. 263 */ 264 static void 265 scan_update_locked(struct ieee80211vap *vap, 266 const struct ieee80211_scanner *scan) 267 { 268 struct ieee80211com *ic = vap->iv_ic; 269 struct ieee80211_scan_state *ss = ic->ic_scan; 270 271 IEEE80211_LOCK_ASSERT(ic); 272 273 #ifdef IEEE80211_DEBUG 274 if (ss->ss_vap != vap || ss->ss_ops != scan) { 275 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 276 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 277 __func__, 278 ss->ss_vap != NULL ? 279 ss->ss_vap->iv_ifp->if_xname : "none", 280 ss->ss_vap != NULL ? 281 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 282 vap->iv_ifp->if_xname, 283 ieee80211_opmode_name[vap->iv_opmode]); 284 } 285 #endif 286 ss->ss_vap = vap; 287 if (ss->ss_ops != scan) { 288 /* 289 * Switch scanners; detach old, attach new. Special 290 * case where a single scan module implements multiple 291 * policies by using different scan ops but a common 292 * core. We assume if the old and new attach methods 293 * are identical then it's ok to just change ss_ops 294 * and not flush the internal state of the module. 295 */ 296 if (scan == NULL || ss->ss_ops == NULL || 297 ss->ss_ops->scan_attach != scan->scan_attach) { 298 if (ss->ss_ops != NULL) 299 ss->ss_ops->scan_detach(ss); 300 if (scan != NULL && !scan->scan_attach(ss)) { 301 /* XXX attach failure */ 302 /* XXX stat+msg */ 303 scan = NULL; 304 } 305 } 306 ss->ss_ops = scan; 307 } 308 } 309 310 static char 311 channel_type(const struct ieee80211_channel *c) 312 { 313 if (IEEE80211_IS_CHAN_ST(c)) 314 return 'S'; 315 if (IEEE80211_IS_CHAN_108A(c)) 316 return 'T'; 317 if (IEEE80211_IS_CHAN_108G(c)) 318 return 'G'; 319 if (IEEE80211_IS_CHAN_HT(c)) 320 return 'n'; 321 if (IEEE80211_IS_CHAN_A(c)) 322 return 'a'; 323 if (IEEE80211_IS_CHAN_ANYG(c)) 324 return 'g'; 325 if (IEEE80211_IS_CHAN_B(c)) 326 return 'b'; 327 return 'f'; 328 } 329 330 void 331 ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 332 { 333 struct ieee80211com *ic = ss->ss_ic; 334 const char *sep; 335 int i; 336 337 sep = ""; 338 for (i = ss->ss_next; i < ss->ss_last; i++) { 339 const struct ieee80211_channel *c = ss->ss_chans[i]; 340 341 kprintf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 342 channel_type(c)); 343 sep = ", "; 344 } 345 } 346 347 #ifdef IEEE80211_DEBUG 348 static void 349 scan_dump(struct ieee80211_scan_state *ss) 350 { 351 struct ieee80211vap *vap = ss->ss_vap; 352 353 if_printf(vap->iv_ifp, "scan set "); 354 ieee80211_scan_dump_channels(ss); 355 kprintf(" dwell min %lums max %lums\n", 356 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 357 } 358 #endif /* IEEE80211_DEBUG */ 359 360 static void 361 copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 362 int nssid, const struct ieee80211_scan_ssid ssids[]) 363 { 364 if (nssid > IEEE80211_SCAN_MAX_SSID) { 365 /* XXX printf */ 366 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 367 "%s: too many ssid %d, ignoring all of them\n", 368 __func__, nssid); 369 return; 370 } 371 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 372 ss->ss_nssid = nssid; 373 } 374 375 /* 376 * Start a scan unless one is already going. 377 */ 378 static int 379 start_scan_locked(const struct ieee80211_scanner *scan, 380 struct ieee80211vap *vap, int flags, u_int duration, 381 u_int mindwell, u_int maxdwell, 382 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 383 { 384 struct ieee80211com *ic = vap->iv_ic; 385 struct ieee80211_scan_state *ss = ic->ic_scan; 386 387 IEEE80211_LOCK_ASSERT(ic); 388 389 if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 390 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 391 "%s: scan inhibited by pending channel change\n", __func__); 392 } else if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 393 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 394 "%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n" 395 , __func__ 396 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 397 , duration, mindwell, maxdwell 398 , ieee80211_phymode_name[vap->iv_des_mode] 399 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 400 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 401 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 402 , flags & IEEE80211_SCAN_NOBCAST ? ", nobcast" : "" 403 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 404 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 405 ); 406 407 scan_update_locked(vap, scan); 408 if (ss->ss_ops != NULL) { 409 if ((flags & IEEE80211_SCAN_NOSSID) == 0) 410 copy_ssid(vap, ss, nssid, ssids); 411 412 /* NB: top 4 bits for internal use */ 413 ss->ss_flags = flags & 0xfff; 414 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 415 vap->iv_stats.is_scan_active++; 416 else 417 vap->iv_stats.is_scan_passive++; 418 if (flags & IEEE80211_SCAN_FLUSH) 419 ss->ss_ops->scan_flush(ss); 420 421 /* NB: flush frames rx'd before 1st channel change */ 422 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 423 SCAN_PRIVATE(ss)->ss_duration = duration; 424 ss->ss_next = 0; 425 ss->ss_mindwell = mindwell; 426 ss->ss_maxdwell = maxdwell; 427 /* NB: scan_start must be before the scan runtask */ 428 ss->ss_ops->scan_start(ss, vap); 429 #ifdef IEEE80211_DEBUG 430 if (ieee80211_msg_scan(vap)) 431 scan_dump(ss); 432 #endif /* IEEE80211_DEBUG */ 433 ic->ic_flags |= IEEE80211_F_SCAN; 434 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 435 } 436 } else { 437 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 438 "%s: %s scan already in progress\n", __func__, 439 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 440 } 441 return (ic->ic_flags & IEEE80211_F_SCAN); 442 } 443 444 /* 445 * Start a scan unless one is already going. 446 */ 447 int 448 ieee80211_start_scan(struct ieee80211vap *vap, int flags, 449 u_int duration, u_int mindwell, u_int maxdwell, 450 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 451 { 452 struct ieee80211com *ic = vap->iv_ic; 453 const struct ieee80211_scanner *scan; 454 int result; 455 456 ic = vap->iv_ic; 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 */ 478 int 479 ieee80211_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 */ 567 int 568 ieee80211_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 */ 580 int 581 ieee80211_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 */ 679 void 680 ieee80211_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 */ 706 void 707 ieee80211_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 */ 733 void 734 ieee80211_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 */ 749 void 750 ieee80211_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 */ 769 void 770 ieee80211_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 */ 803 static void 804 scan_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 } 815 816 static void 817 scan_signal(void *arg) 818 { 819 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 820 821 IEEE80211_LOCK(ss->ss_ic); 822 cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv); 823 IEEE80211_UNLOCK(ss->ss_ic); 824 } 825 826 /* 827 * Handle mindwell requirements completed; initiate a channel 828 * change to the next channel asap. 829 */ 830 static void 831 scan_mindwell(struct ieee80211_scan_state *ss) 832 { 833 struct ieee80211com *ic = ss->ss_ic; 834 835 ic = ss->ss_ic; 836 IEEE80211_LOCK(ic); 837 scan_signal(ss); 838 IEEE80211_UNLOCK(ic); 839 } 840 841 static void 842 scan_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 goto done; 863 } 864 865 if (vap->iv_opmode == IEEE80211_M_STA && 866 vap->iv_state == IEEE80211_S_RUN) { 867 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) { 868 /* Enable station power save mode */ 869 ieee80211_sta_pwrsave(vap, 1); 870 /* 871 * Use an 1ms delay so the null data frame has a chance 872 * to go out. 873 * XXX Should use M_TXCB mechanism to eliminate this. 874 */ 875 cv_timedwait(&SCAN_PRIVATE(ss)->ss_scan_cv, 876 IEEE80211_LOCK_OBJ(ic), hz / 1000); 877 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 878 goto done; 879 } 880 } 881 882 scanend = ticks + SCAN_PRIVATE(ss)->ss_duration; 883 IEEE80211_UNLOCK(ic); 884 ic->ic_scan_start(ic); /* notify driver */ 885 IEEE80211_LOCK(ic); 886 887 for (;;) { 888 scandone = (ss->ss_next >= ss->ss_last) || 889 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0; 890 if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) || 891 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) || 892 time_after(ticks + ss->ss_mindwell, scanend)) 893 break; 894 895 chan = ss->ss_chans[ss->ss_next++]; 896 897 /* 898 * Watch for truncation due to the scan end time. 899 */ 900 if (time_after(ticks + ss->ss_maxdwell, scanend)) 901 maxdwell = scanend - ticks; 902 else 903 maxdwell = ss->ss_maxdwell; 904 905 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 906 "%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n", 907 __func__, 908 ieee80211_chan2ieee(ic, ic->ic_curchan), 909 channel_type(ic->ic_curchan), 910 ieee80211_chan2ieee(ic, chan), channel_type(chan), 911 (ss->ss_flags & IEEE80211_SCAN_ACTIVE) && 912 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ? 913 "active" : "passive", 914 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell)); 915 916 /* 917 * Potentially change channel and phy mode. 918 */ 919 ic->ic_curchan = chan; 920 ic->ic_rt = ieee80211_get_ratetable(chan); 921 IEEE80211_UNLOCK(ic); 922 /* 923 * Perform the channel change and scan unlocked so the driver 924 * may sleep. Once set_channel returns the hardware has 925 * completed the channel change. 926 */ 927 ic->ic_set_channel(ic); 928 ieee80211_radiotap_chan_change(ic); 929 930 /* 931 * Scan curchan. Drivers for "intelligent hardware" 932 * override ic_scan_curchan to tell the device to do 933 * the work. Otherwise we manage the work outselves; 934 * sending a probe request (as needed), and arming the 935 * timeout to switch channels after maxdwell ticks. 936 * 937 * scan_curchan should only pause for the time required to 938 * prepare/initiate the hardware for the scan (if at all), the 939 * below condvar is used to sleep for the channels dwell time 940 * and allows it to be signalled for abort. 941 */ 942 ic->ic_scan_curchan(ss, maxdwell); 943 IEEE80211_LOCK(ic); 944 945 SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell; 946 /* clear mindwell lock and initial channel change flush */ 947 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 948 949 if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT))) 950 continue; 951 952 /* Wait to be signalled to scan the next channel */ 953 cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv, IEEE80211_LOCK_OBJ(ic)); 954 } 955 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 956 goto done; 957 958 IEEE80211_UNLOCK(ic); 959 ic->ic_scan_end(ic); /* notify driver */ 960 IEEE80211_LOCK(ic); 961 962 /* 963 * Record scan complete time. Note that we also do 964 * this when canceled so any background scan will 965 * not be restarted for a while. 966 */ 967 if (scandone) 968 ic->ic_lastscan = ticks; 969 /* return to the bss channel */ 970 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 971 ic->ic_curchan != ic->ic_bsschan) { 972 ieee80211_setupcurchan(ic, ic->ic_bsschan); 973 IEEE80211_UNLOCK(ic); 974 ic->ic_set_channel(ic); 975 ieee80211_radiotap_chan_change(ic); 976 IEEE80211_LOCK(ic); 977 } 978 /* clear internal flags and any indication of a pick */ 979 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 980 ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK; 981 982 /* 983 * If not canceled and scan completed, do post-processing. 984 * If the callback function returns 0, then it wants to 985 * continue/restart scanning. Unfortunately we needed to 986 * notify the driver to end the scan above to avoid having 987 * rx frames alter the scan candidate list. 988 */ 989 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 && 990 !ss->ss_ops->scan_end(ss, vap) && 991 (ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 && 992 time_before(ticks + ss->ss_mindwell, scanend)) { 993 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 994 "%s: done, restart " 995 "[ticks %u, dwell min %lu scanend %lu]\n", 996 __func__, 997 ticks, ss->ss_mindwell, scanend); 998 ss->ss_next = 0; /* reset to begining */ 999 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 1000 vap->iv_stats.is_scan_active++; 1001 else 1002 vap->iv_stats.is_scan_passive++; 1003 1004 ss->ss_ops->scan_restart(ss, vap); /* XXX? */ 1005 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 1006 IEEE80211_UNLOCK(ic); 1007 return; 1008 } 1009 1010 /* past here, scandone is ``true'' if not in bg mode */ 1011 if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0) 1012 scandone = 1; 1013 1014 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1015 "%s: %s, [ticks %u, dwell min %lu scanend %lu]\n", 1016 __func__, scandone ? "done" : "stopped", 1017 ticks, ss->ss_mindwell, scanend); 1018 1019 /* 1020 * Clear the SCAN bit first in case frames are 1021 * pending on the station power save queue. If 1022 * we defer this then the dispatch of the frames 1023 * may generate a request to cancel scanning. 1024 */ 1025 done: 1026 ic->ic_flags &= ~IEEE80211_F_SCAN; 1027 /* 1028 * Drop out of power save mode when a scan has 1029 * completed. If this scan was prematurely terminated 1030 * because it is a background scan then don't notify 1031 * the ap; we'll either return to scanning after we 1032 * receive the beacon frame or we'll drop out of power 1033 * save mode because the beacon indicates we have frames 1034 * waiting for us. 1035 */ 1036 if (scandone) { 1037 ieee80211_sta_pwrsave(vap, 0); 1038 if (ss->ss_next >= ss->ss_last) { 1039 ieee80211_notify_scan_done(vap); 1040 ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN; 1041 } 1042 } 1043 SCAN_PRIVATE(ss)->ss_iflags &= ~(ISCAN_CANCEL|ISCAN_ABORT); 1044 ss->ss_flags &= ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST); 1045 IEEE80211_UNLOCK(ic); 1046 #undef ISCAN_REP 1047 } 1048 1049 #ifdef IEEE80211_DEBUG 1050 static void 1051 dump_country(const uint8_t *ie) 1052 { 1053 const struct ieee80211_country_ie *cie = 1054 (const struct ieee80211_country_ie *) ie; 1055 int i, nbands, schan, nchan; 1056 1057 if (cie->len < 3) { 1058 kprintf(" <bogus country ie, len %d>", cie->len); 1059 return; 1060 } 1061 kprintf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 1062 nbands = (cie->len - 3) / sizeof(cie->band[0]); 1063 for (i = 0; i < nbands; i++) { 1064 schan = cie->band[i].schan; 1065 nchan = cie->band[i].nchan; 1066 if (nchan != 1) 1067 kprintf(" %u-%u,%u", schan, schan + nchan-1, 1068 cie->band[i].maxtxpwr); 1069 else 1070 kprintf(" %u,%u", schan, cie->band[i].maxtxpwr); 1071 } 1072 kprintf("]"); 1073 } 1074 1075 static void 1076 dump_probe_beacon(uint8_t subtype, int isnew, 1077 const uint8_t mac[IEEE80211_ADDR_LEN], 1078 const struct ieee80211_scanparams *sp, int rssi) 1079 { 1080 1081 kprintf("[%6D] %s%s on chan %u (bss chan %u) ", 1082 mac, ":", isnew ? "new " : "", 1083 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], 1084 sp->chan, sp->bchan); 1085 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 1086 kprintf(" rssi %d\n", rssi); 1087 1088 if (isnew) { 1089 kprintf("[%6D] caps 0x%x bintval %u erp 0x%x", 1090 mac, ":", sp->capinfo, sp->bintval, sp->erp); 1091 if (sp->country != NULL) 1092 dump_country(sp->country); 1093 kprintf("\n"); 1094 } 1095 } 1096 #endif /* IEEE80211_DEBUG */ 1097 1098 /* 1099 * Process a beacon or probe response frame. 1100 */ 1101 void 1102 ieee80211_add_scan(struct ieee80211vap *vap, 1103 const struct ieee80211_scanparams *sp, 1104 const struct ieee80211_frame *wh, 1105 int subtype, int rssi, int noise) 1106 { 1107 struct ieee80211com *ic = vap->iv_ic; 1108 struct ieee80211_scan_state *ss = ic->ic_scan; 1109 1110 /* XXX locking */ 1111 /* 1112 * Frames received during startup are discarded to avoid 1113 * using scan state setup on the initial entry to the timer 1114 * callback. This can occur because the device may enable 1115 * rx prior to our doing the initial channel change in the 1116 * timer routine. 1117 */ 1118 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD) 1119 return; 1120 #ifdef IEEE80211_DEBUG 1121 if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN)) 1122 dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi); 1123 #endif 1124 if (ss->ss_ops != NULL && 1125 ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise)) { 1126 /* 1127 * If we've reached the min dwell time terminate 1128 * the timer so we'll switch to the next channel. 1129 */ 1130 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 && 1131 time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) { 1132 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1133 "%s: chan %3d%c min dwell met (%u > %lu)\n", 1134 __func__, 1135 ieee80211_chan2ieee(ic, ic->ic_curchan), 1136 channel_type(ic->ic_curchan), 1137 ticks, SCAN_PRIVATE(ss)->ss_chanmindwell); 1138 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL; 1139 /* 1140 * NB: trigger at next clock tick or wait for the 1141 * hardware. 1142 */ 1143 ic->ic_scan_mindwell(ss); 1144 } 1145 } 1146 } 1147 1148 /* 1149 * Timeout/age scan cache entries; called from sta timeout 1150 * timer (XXX should be self-contained). 1151 */ 1152 void 1153 ieee80211_scan_timeout(struct ieee80211com *ic) 1154 { 1155 struct ieee80211_scan_state *ss = ic->ic_scan; 1156 1157 if (ss->ss_ops != NULL) 1158 ss->ss_ops->scan_age(ss); 1159 } 1160 1161 /* 1162 * Mark a scan cache entry after a successful associate. 1163 */ 1164 void 1165 ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 1166 { 1167 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1168 1169 if (ss->ss_ops != NULL) { 1170 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 1171 mac, "%s", __func__); 1172 ss->ss_ops->scan_assoc_success(ss, mac); 1173 } 1174 } 1175 1176 /* 1177 * Demerit a scan cache entry after failing to associate. 1178 */ 1179 void 1180 ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 1181 const uint8_t mac[], int reason) 1182 { 1183 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1184 1185 if (ss->ss_ops != NULL) { 1186 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 1187 "%s: reason %u", __func__, reason); 1188 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 1189 } 1190 } 1191 1192 /* 1193 * Iterate over the contents of the scan cache. 1194 */ 1195 void 1196 ieee80211_scan_iterate(struct ieee80211vap *vap, 1197 ieee80211_scan_iter_func *f, void *arg) 1198 { 1199 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1200 1201 if (ss->ss_ops != NULL) 1202 ss->ss_ops->scan_iterate(ss, f, arg); 1203 } 1204 1205 /* 1206 * Flush the contents of the scan cache. 1207 */ 1208 void 1209 ieee80211_scan_flush(struct ieee80211vap *vap) 1210 { 1211 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1212 1213 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 1214 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 1215 ss->ss_ops->scan_flush(ss); 1216 } 1217 } 1218 1219 /* 1220 * Check the scan cache for an ap/channel to use; if that 1221 * fails then kick off a new scan. 1222 */ 1223 struct ieee80211_channel * 1224 ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 1225 { 1226 struct ieee80211_scan_state *ss = ic->ic_scan; 1227 1228 IEEE80211_LOCK_ASSERT(ic); 1229 1230 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 1231 /* XXX printf? */ 1232 return NULL; 1233 } 1234 if (ss->ss_ops->scan_pickchan == NULL) { 1235 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 1236 "%s: scan module does not support picking a channel, " 1237 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 1238 return NULL; 1239 } 1240 return ss->ss_ops->scan_pickchan(ss, flags); 1241 } 1242