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 50 struct 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 95 static void scan_curchan(struct ieee80211_scan_state *, unsigned long); 96 static void scan_mindwell(struct ieee80211_scan_state *); 97 static void scan_signal(void *); 98 static void scan_task(void *, int); 99 100 MALLOC_DEFINE(M_80211_SCAN, "80211scan", "802.11 scan state"); 101 102 void 103 ieee80211_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 } 122 123 void 124 ieee80211_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 } 145 146 static 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 }; 168 169 void 170 ieee80211_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 } 179 180 void 181 ieee80211_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 */ 205 static 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 }; 214 static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 215 216 const struct ieee80211_scanner * 217 ieee80211_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 } 225 226 void 227 ieee80211_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 } 234 235 void 236 ieee80211_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 } 244 245 void 246 ieee80211_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 */ 263 static void 264 scan_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 } 308 309 static char 310 channel_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 } 328 329 void 330 ieee80211_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 347 static void 348 scan_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 */ 358 359 static void 360 copy_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 */ 377 static int 378 start_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); 419 420 /* NB: flush frames rx'd before 1st channel change */ 421 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 422 SCAN_PRIVATE(ss)->ss_duration = duration; 423 ss->ss_next = 0; 424 ss->ss_mindwell = mindwell; 425 ss->ss_maxdwell = maxdwell; 426 /* NB: scan_start must be before the scan runtask */ 427 ss->ss_ops->scan_start(ss, vap); 428 #ifdef IEEE80211_DEBUG 429 if (ieee80211_msg_scan(vap)) 430 scan_dump(ss); 431 #endif /* IEEE80211_DEBUG */ 432 ic->ic_flags |= IEEE80211_F_SCAN; 433 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 434 } 435 } else { 436 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 437 "%s: %s scan already in progress\n", __func__, 438 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 439 } 440 return (ic->ic_flags & IEEE80211_F_SCAN); 441 } 442 443 /* 444 * Start a scan unless one is already going. 445 */ 446 int 447 ieee80211_start_scan(struct ieee80211vap *vap, int flags, 448 u_int duration, u_int mindwell, u_int maxdwell, 449 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 450 { 451 struct ieee80211com *ic = vap->iv_ic; 452 const struct ieee80211_scanner *scan; 453 int result; 454 455 scan = ieee80211_scanner_get(vap->iv_opmode); 456 if (scan == NULL) { 457 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 458 "%s: no scanner support for %s mode\n", 459 __func__, ieee80211_opmode_name[vap->iv_opmode]); 460 /* XXX stat */ 461 return 0; 462 } 463 464 IEEE80211_LOCK(ic); 465 result = start_scan_locked(scan, vap, flags, duration, 466 mindwell, maxdwell, nssid, ssids); 467 IEEE80211_UNLOCK(ic); 468 469 return result; 470 } 471 472 /* 473 * Check the scan cache for an ap/channel to use; if that 474 * fails then kick off a new scan. 475 */ 476 int 477 ieee80211_check_scan(struct ieee80211vap *vap, int flags, 478 u_int duration, u_int mindwell, u_int maxdwell, 479 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 480 { 481 struct ieee80211com *ic = vap->iv_ic; 482 struct ieee80211_scan_state *ss = ic->ic_scan; 483 const struct ieee80211_scanner *scan; 484 int result; 485 486 scan = ieee80211_scanner_get(vap->iv_opmode); 487 if (scan == NULL) { 488 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 489 "%s: no scanner support for %s mode\n", 490 __func__, vap->iv_opmode); 491 /* XXX stat */ 492 return 0; 493 } 494 495 /* 496 * Check if there's a list of scan candidates already. 497 * XXX want more than the ap we're currently associated with 498 */ 499 500 IEEE80211_LOCK(ic); 501 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 502 "%s: %s scan, %s%s%s%s%s\n" 503 , __func__ 504 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 505 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 506 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 507 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 508 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 509 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 510 ); 511 512 if (ss->ss_ops != scan) { 513 /* XXX re-use cache contents? e.g. adhoc<->sta */ 514 flags |= IEEE80211_SCAN_FLUSH; 515 } 516 scan_update_locked(vap, scan); 517 if (ss->ss_ops != NULL) { 518 /* XXX verify ss_ops matches vap->iv_opmode */ 519 if ((flags & IEEE80211_SCAN_NOSSID) == 0) { 520 /* 521 * Update the ssid list and mark flags so if 522 * we call start_scan it doesn't duplicate work. 523 */ 524 copy_ssid(vap, ss, nssid, ssids); 525 flags |= IEEE80211_SCAN_NOSSID; 526 } 527 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 528 (flags & IEEE80211_SCAN_FLUSH) == 0 && 529 time_before(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 530 /* 531 * We're not currently scanning and the cache is 532 * deemed hot enough to consult. Lock out others 533 * by marking IEEE80211_F_SCAN while we decide if 534 * something is already in the scan cache we can 535 * use. Also discard any frames that might come 536 * in while temporarily marked as scanning. 537 */ 538 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 539 ic->ic_flags |= IEEE80211_F_SCAN; 540 541 /* NB: need to use supplied flags in check */ 542 ss->ss_flags = flags & 0xff; 543 result = ss->ss_ops->scan_end(ss, vap); 544 545 ic->ic_flags &= ~IEEE80211_F_SCAN; 546 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD; 547 if (result) { 548 ieee80211_notify_scan_done(vap); 549 IEEE80211_UNLOCK(ic); 550 return 1; 551 } 552 } 553 } 554 result = start_scan_locked(scan, vap, flags, duration, 555 mindwell, maxdwell, nssid, ssids); 556 IEEE80211_UNLOCK(ic); 557 558 return result; 559 } 560 561 /* 562 * Check the scan cache for an ap/channel to use; if that fails 563 * then kick off a scan using the current settings. 564 */ 565 int 566 ieee80211_check_scan_current(struct ieee80211vap *vap) 567 { 568 return ieee80211_check_scan(vap, 569 IEEE80211_SCAN_ACTIVE, 570 IEEE80211_SCAN_FOREVER, 0, 0, 571 vap->iv_des_nssid, vap->iv_des_ssid); 572 } 573 574 /* 575 * Restart a previous scan. If the previous scan completed 576 * then we start again using the existing channel list. 577 */ 578 int 579 ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 580 { 581 struct ieee80211com *ic = vap->iv_ic; 582 struct ieee80211_scan_state *ss = ic->ic_scan; 583 const struct ieee80211_scanner *scan; 584 585 scan = ieee80211_scanner_get(vap->iv_opmode); 586 if (scan == NULL) { 587 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 588 "%s: no scanner support for %s mode\n", 589 __func__, vap->iv_opmode); 590 /* XXX stat */ 591 return 0; 592 } 593 594 IEEE80211_LOCK(ic); 595 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 596 u_int duration; 597 /* 598 * Go off-channel for a fixed interval that is large 599 * enough to catch most ap's but short enough that 600 * we can return on-channel before our listen interval 601 * expires. 602 */ 603 duration = IEEE80211_SCAN_OFFCHANNEL; 604 605 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 606 "%s: %s scan, ticks %u duration %lu\n", __func__, 607 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive", 608 ticks, duration); 609 610 scan_update_locked(vap, scan); 611 if (ss->ss_ops != NULL) { 612 ss->ss_vap = vap; 613 /* 614 * A background scan does not select a new sta; it 615 * just refreshes the scan cache. Also, indicate 616 * the scan logic should follow the beacon schedule: 617 * we go off-channel and scan for a while, then 618 * return to the bss channel to receive a beacon, 619 * then go off-channel again. All during this time 620 * we notify the ap we're in power save mode. When 621 * the scan is complete we leave power save mode. 622 * If any beacon indicates there are frames pending 623 * for us then we drop out of power save mode 624 * (and background scan) automatically by way of the 625 * usual sta power save logic. 626 */ 627 ss->ss_flags |= IEEE80211_SCAN_NOPICK 628 | IEEE80211_SCAN_BGSCAN 629 | flags 630 ; 631 /* if previous scan completed, restart */ 632 if (ss->ss_next >= ss->ss_last) { 633 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 634 vap->iv_stats.is_scan_active++; 635 else 636 vap->iv_stats.is_scan_passive++; 637 /* 638 * NB: beware of the scan cache being flushed; 639 * if the channel list is empty use the 640 * scan_start method to populate it. 641 */ 642 ss->ss_next = 0; 643 if (ss->ss_last != 0) 644 ss->ss_ops->scan_restart(ss, vap); 645 else { 646 ss->ss_ops->scan_start(ss, vap); 647 #ifdef IEEE80211_DEBUG 648 if (ieee80211_msg_scan(vap)) 649 scan_dump(ss); 650 #endif /* IEEE80211_DEBUG */ 651 } 652 } 653 /* NB: flush frames rx'd before 1st channel change */ 654 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 655 SCAN_PRIVATE(ss)->ss_duration = duration; 656 ss->ss_maxdwell = duration; 657 ic->ic_flags |= IEEE80211_F_SCAN; 658 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN; 659 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 660 } else { 661 /* XXX msg+stat */ 662 } 663 } else { 664 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 665 "%s: %s scan already in progress\n", __func__, 666 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 667 } 668 IEEE80211_UNLOCK(ic); 669 670 /* NB: racey, does it matter? */ 671 return (ic->ic_flags & IEEE80211_F_SCAN); 672 } 673 674 /* 675 * Cancel any scan currently going on for the specified vap. 676 */ 677 void 678 ieee80211_cancel_scan(struct ieee80211vap *vap) 679 { 680 struct ieee80211com *ic = vap->iv_ic; 681 struct ieee80211_scan_state *ss = ic->ic_scan; 682 683 IEEE80211_LOCK(ic); 684 if ((ic->ic_flags & IEEE80211_F_SCAN) && 685 ss->ss_vap == vap && 686 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 687 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 688 "%s: cancel %s scan\n", __func__, 689 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 690 "active" : "passive"); 691 692 /* clear bg scan NOPICK and mark cancel request */ 693 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 694 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 695 /* wake up the scan task */ 696 scan_signal(ss); 697 } 698 IEEE80211_UNLOCK(ic); 699 } 700 701 /* 702 * Cancel any scan currently going on. 703 */ 704 void 705 ieee80211_cancel_anyscan(struct ieee80211vap *vap) 706 { 707 struct ieee80211com *ic = vap->iv_ic; 708 struct ieee80211_scan_state *ss = ic->ic_scan; 709 710 IEEE80211_LOCK(ic); 711 if ((ic->ic_flags & IEEE80211_F_SCAN) && 712 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 713 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 714 "%s: cancel %s scan\n", __func__, 715 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 716 "active" : "passive"); 717 718 /* clear bg scan NOPICK and mark cancel request */ 719 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 720 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 721 /* wake up the scan task */ 722 scan_signal(ss); 723 } 724 IEEE80211_UNLOCK(ic); 725 } 726 727 /* 728 * Public access to scan_next for drivers that manage 729 * scanning themselves (e.g. for firmware-based devices). 730 */ 731 void 732 ieee80211_scan_next(struct ieee80211vap *vap) 733 { 734 struct ieee80211com *ic = vap->iv_ic; 735 struct ieee80211_scan_state *ss = ic->ic_scan; 736 737 /* wake up the scan task */ 738 IEEE80211_LOCK(ic); 739 scan_signal(ss); 740 IEEE80211_UNLOCK(ic); 741 } 742 743 /* 744 * Public access to scan_next for drivers that are not able to scan single 745 * channels (e.g. for firmware-based devices). 746 */ 747 void 748 ieee80211_scan_done(struct ieee80211vap *vap) 749 { 750 struct ieee80211com *ic = vap->iv_ic; 751 struct ieee80211_scan_state *ss; 752 753 IEEE80211_LOCK(ic); 754 ss = ic->ic_scan; 755 ss->ss_next = ss->ss_last; /* all channels are complete */ 756 scan_signal(ss); 757 IEEE80211_UNLOCK(ic); 758 } 759 760 /* 761 * Probe the curent channel, if allowed, while scanning. 762 * If the channel is not marked passive-only then send 763 * a probe request immediately. Otherwise mark state and 764 * listen for beacons on the channel; if we receive something 765 * then we'll transmit a probe request. 766 */ 767 void 768 ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 769 { 770 struct ieee80211com *ic = vap->iv_ic; 771 struct ieee80211_scan_state *ss = ic->ic_scan; 772 struct ifnet *ifp = vap->iv_ifp; 773 int i; 774 775 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 776 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 777 return; 778 } 779 /* 780 * Send directed probe requests followed by any 781 * broadcast probe request. 782 * XXX remove dependence on ic/vap->iv_bss 783 */ 784 for (i = 0; i < ss->ss_nssid; i++) 785 ieee80211_send_probereq(vap->iv_bss, 786 vap->iv_myaddr, ifp->if_broadcastaddr, 787 ifp->if_broadcastaddr, 788 ss->ss_ssid[i].ssid, ss->ss_ssid[i].len); 789 if ((ss->ss_flags & IEEE80211_SCAN_NOBCAST) == 0) 790 ieee80211_send_probereq(vap->iv_bss, 791 vap->iv_myaddr, ifp->if_broadcastaddr, 792 ifp->if_broadcastaddr, 793 "", 0); 794 } 795 796 /* 797 * Scan curchan. If this is an active scan and the channel 798 * is not marked passive then send probe request frame(s). 799 * Arrange for the channel change after maxdwell ticks. 800 */ 801 static void 802 scan_curchan(struct ieee80211_scan_state *ss, unsigned long maxdwell) 803 { 804 struct ieee80211vap *vap = ss->ss_vap; 805 806 IEEE80211_LOCK(vap->iv_ic); 807 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 808 ieee80211_probe_curchan(vap, 0); 809 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 810 maxdwell, scan_signal, ss); 811 IEEE80211_UNLOCK(vap->iv_ic); 812 } 813 814 static void 815 scan_signal(void *arg) 816 { 817 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 818 819 IEEE80211_LOCK_ASSERT(ss->ss_ic); 820 821 cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv); 822 } 823 824 /* 825 * Handle mindwell requirements completed; initiate a channel 826 * change to the next channel asap. 827 */ 828 static void 829 scan_mindwell(struct ieee80211_scan_state *ss) 830 { 831 struct ieee80211com *ic = ss->ss_ic; 832 833 IEEE80211_LOCK(ic); 834 scan_signal(ss); 835 IEEE80211_UNLOCK(ic); 836 } 837 838 static void 839 scan_task(void *arg, int pending) 840 { 841 #define ISCAN_REP (ISCAN_MINDWELL | ISCAN_DISCARD) 842 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 843 struct ieee80211vap *vap = ss->ss_vap; 844 struct ieee80211com *ic = ss->ss_ic; 845 struct ieee80211_channel *chan; 846 unsigned long maxdwell, scanend; 847 int scandone = 0; 848 849 IEEE80211_LOCK(ic); 850 if (vap == NULL || (ic->ic_flags & IEEE80211_F_SCAN) == 0 || 851 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)) { 852 /* Cancelled before we started */ 853 goto done; 854 } 855 856 if (ss->ss_next == ss->ss_last) { 857 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 858 "%s: no channels to scan\n", __func__); 859 goto done; 860 } 861 862 if (vap->iv_opmode == IEEE80211_M_STA && 863 vap->iv_state == IEEE80211_S_RUN) { 864 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) { 865 /* Enable station power save mode */ 866 ieee80211_sta_pwrsave(vap, 1); 867 /* 868 * Use an 1ms delay so the null data frame has a chance 869 * to go out. 870 * XXX Should use M_TXCB mechanism to eliminate this. 871 */ 872 cv_timedwait(&SCAN_PRIVATE(ss)->ss_scan_cv, 873 IEEE80211_LOCK_OBJ(ic), hz / 1000); 874 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 875 goto done; 876 } 877 } 878 879 scanend = ticks + SCAN_PRIVATE(ss)->ss_duration; 880 IEEE80211_UNLOCK(ic); 881 ic->ic_scan_start(ic); /* notify driver */ 882 IEEE80211_LOCK(ic); 883 884 for (;;) { 885 scandone = (ss->ss_next >= ss->ss_last) || 886 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0; 887 if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) || 888 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) || 889 time_after(ticks + ss->ss_mindwell, scanend)) 890 break; 891 892 chan = ss->ss_chans[ss->ss_next++]; 893 894 /* 895 * Watch for truncation due to the scan end time. 896 */ 897 if (time_after(ticks + ss->ss_maxdwell, scanend)) 898 maxdwell = scanend - ticks; 899 else 900 maxdwell = ss->ss_maxdwell; 901 902 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 903 "%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n", 904 __func__, 905 ieee80211_chan2ieee(ic, ic->ic_curchan), 906 channel_type(ic->ic_curchan), 907 ieee80211_chan2ieee(ic, chan), channel_type(chan), 908 (ss->ss_flags & IEEE80211_SCAN_ACTIVE) && 909 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ? 910 "active" : "passive", 911 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell)); 912 913 /* 914 * Potentially change channel and phy mode. 915 */ 916 ic->ic_curchan = chan; 917 ic->ic_rt = ieee80211_get_ratetable(chan); 918 IEEE80211_UNLOCK(ic); 919 /* 920 * Perform the channel change and scan unlocked so the driver 921 * may sleep. Once set_channel returns the hardware has 922 * completed the channel change. 923 */ 924 ic->ic_set_channel(ic); 925 ieee80211_radiotap_chan_change(ic); 926 927 /* 928 * Scan curchan. Drivers for "intelligent hardware" 929 * override ic_scan_curchan to tell the device to do 930 * the work. Otherwise we manage the work outselves; 931 * sending a probe request (as needed), and arming the 932 * timeout to switch channels after maxdwell ticks. 933 * 934 * scan_curchan should only pause for the time required to 935 * prepare/initiate the hardware for the scan (if at all), the 936 * below condvar is used to sleep for the channels dwell time 937 * and allows it to be signalled for abort. 938 */ 939 ic->ic_scan_curchan(ss, maxdwell); 940 IEEE80211_LOCK(ic); 941 942 SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell; 943 /* clear mindwell lock and initial channel change flush */ 944 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 945 946 if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT))) 947 continue; 948 949 /* Wait to be signalled to scan the next channel */ 950 cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv, IEEE80211_LOCK_OBJ(ic)); 951 } 952 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 953 goto done; 954 955 IEEE80211_UNLOCK(ic); 956 ic->ic_scan_end(ic); /* notify driver */ 957 IEEE80211_LOCK(ic); 958 959 /* 960 * Record scan complete time. Note that we also do 961 * this when canceled so any background scan will 962 * not be restarted for a while. 963 */ 964 if (scandone) 965 ic->ic_lastscan = ticks; 966 /* return to the bss channel */ 967 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 968 ic->ic_curchan != ic->ic_bsschan) { 969 ieee80211_setupcurchan(ic, ic->ic_bsschan); 970 IEEE80211_UNLOCK(ic); 971 ic->ic_set_channel(ic); 972 ieee80211_radiotap_chan_change(ic); 973 IEEE80211_LOCK(ic); 974 } 975 /* clear internal flags and any indication of a pick */ 976 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 977 ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK; 978 979 /* 980 * If not canceled and scan completed, do post-processing. 981 * If the callback function returns 0, then it wants to 982 * continue/restart scanning. Unfortunately we needed to 983 * notify the driver to end the scan above to avoid having 984 * rx frames alter the scan candidate list. 985 */ 986 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 && 987 !ss->ss_ops->scan_end(ss, vap) && 988 (ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 && 989 time_before(ticks + ss->ss_mindwell, scanend)) { 990 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 991 "%s: done, restart " 992 "[ticks %u, dwell min %lu scanend %lu]\n", 993 __func__, 994 ticks, ss->ss_mindwell, scanend); 995 ss->ss_next = 0; /* reset to begining */ 996 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 997 vap->iv_stats.is_scan_active++; 998 else 999 vap->iv_stats.is_scan_passive++; 1000 1001 ss->ss_ops->scan_restart(ss, vap); /* XXX? */ 1002 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 1003 IEEE80211_UNLOCK(ic); 1004 return; 1005 } 1006 1007 /* past here, scandone is ``true'' if not in bg mode */ 1008 if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0) 1009 scandone = 1; 1010 1011 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1012 "%s: %s, [ticks %u, dwell min %lu scanend %lu]\n", 1013 __func__, scandone ? "done" : "stopped", 1014 ticks, ss->ss_mindwell, scanend); 1015 1016 /* 1017 * Clear the SCAN bit first in case frames are 1018 * pending on the station power save queue. If 1019 * we defer this then the dispatch of the frames 1020 * may generate a request to cancel scanning. 1021 */ 1022 done: 1023 ic->ic_flags &= ~IEEE80211_F_SCAN; 1024 /* 1025 * Drop out of power save mode when a scan has 1026 * completed. If this scan was prematurely terminated 1027 * because it is a background scan then don't notify 1028 * the ap; we'll either return to scanning after we 1029 * receive the beacon frame or we'll drop out of power 1030 * save mode because the beacon indicates we have frames 1031 * waiting for us. 1032 */ 1033 if (scandone) { 1034 ieee80211_sta_pwrsave(vap, 0); 1035 if (ss->ss_next >= ss->ss_last) { 1036 ieee80211_notify_scan_done(vap); 1037 ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN; 1038 } 1039 } 1040 SCAN_PRIVATE(ss)->ss_iflags &= ~(ISCAN_CANCEL|ISCAN_ABORT); 1041 ss->ss_flags &= ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST); 1042 IEEE80211_UNLOCK(ic); 1043 #undef ISCAN_REP 1044 } 1045 1046 #ifdef IEEE80211_DEBUG 1047 static void 1048 dump_country(const uint8_t *ie) 1049 { 1050 const struct ieee80211_country_ie *cie = 1051 (const struct ieee80211_country_ie *) ie; 1052 int i, nbands, schan, nchan; 1053 1054 if (cie->len < 3) { 1055 printf(" <bogus country ie, len %d>", cie->len); 1056 return; 1057 } 1058 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 1059 nbands = (cie->len - 3) / sizeof(cie->band[0]); 1060 for (i = 0; i < nbands; i++) { 1061 schan = cie->band[i].schan; 1062 nchan = cie->band[i].nchan; 1063 if (nchan != 1) 1064 printf(" %u-%u,%u", schan, schan + nchan-1, 1065 cie->band[i].maxtxpwr); 1066 else 1067 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 1068 } 1069 printf("]"); 1070 } 1071 1072 static void 1073 dump_probe_beacon(uint8_t subtype, int isnew, 1074 const uint8_t mac[IEEE80211_ADDR_LEN], 1075 const struct ieee80211_scanparams *sp, int rssi) 1076 { 1077 1078 printf("[%s] %s%s on chan %u (bss chan %u) ", 1079 ether_sprintf(mac), isnew ? "new " : "", 1080 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], 1081 sp->chan, sp->bchan); 1082 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 1083 printf(" rssi %d\n", rssi); 1084 1085 if (isnew) { 1086 printf("[%s] caps 0x%x bintval %u erp 0x%x", 1087 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 1088 if (sp->country != NULL) 1089 dump_country(sp->country); 1090 printf("\n"); 1091 } 1092 } 1093 #endif /* IEEE80211_DEBUG */ 1094 1095 /* 1096 * Process a beacon or probe response frame. 1097 */ 1098 void 1099 ieee80211_add_scan(struct ieee80211vap *vap, 1100 const struct ieee80211_scanparams *sp, 1101 const struct ieee80211_frame *wh, 1102 int subtype, int rssi, int noise) 1103 { 1104 struct ieee80211com *ic = vap->iv_ic; 1105 struct ieee80211_scan_state *ss = ic->ic_scan; 1106 1107 /* XXX locking */ 1108 /* 1109 * Frames received during startup are discarded to avoid 1110 * using scan state setup on the initial entry to the timer 1111 * callback. This can occur because the device may enable 1112 * rx prior to our doing the initial channel change in the 1113 * timer routine. 1114 */ 1115 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD) 1116 return; 1117 #ifdef IEEE80211_DEBUG 1118 if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN)) 1119 dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi); 1120 #endif 1121 if (ss->ss_ops != NULL && 1122 ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise)) { 1123 /* 1124 * If we've reached the min dwell time terminate 1125 * the timer so we'll switch to the next channel. 1126 */ 1127 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 && 1128 time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) { 1129 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1130 "%s: chan %3d%c min dwell met (%u > %lu)\n", 1131 __func__, 1132 ieee80211_chan2ieee(ic, ic->ic_curchan), 1133 channel_type(ic->ic_curchan), 1134 ticks, SCAN_PRIVATE(ss)->ss_chanmindwell); 1135 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL; 1136 /* 1137 * NB: trigger at next clock tick or wait for the 1138 * hardware. 1139 */ 1140 ic->ic_scan_mindwell(ss); 1141 } 1142 } 1143 } 1144 1145 /* 1146 * Timeout/age scan cache entries; called from sta timeout 1147 * timer (XXX should be self-contained). 1148 */ 1149 void 1150 ieee80211_scan_timeout(struct ieee80211com *ic) 1151 { 1152 struct ieee80211_scan_state *ss = ic->ic_scan; 1153 1154 if (ss->ss_ops != NULL) 1155 ss->ss_ops->scan_age(ss); 1156 } 1157 1158 /* 1159 * Mark a scan cache entry after a successful associate. 1160 */ 1161 void 1162 ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 1163 { 1164 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1165 1166 if (ss->ss_ops != NULL) { 1167 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 1168 mac, "%s", __func__); 1169 ss->ss_ops->scan_assoc_success(ss, mac); 1170 } 1171 } 1172 1173 /* 1174 * Demerit a scan cache entry after failing to associate. 1175 */ 1176 void 1177 ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 1178 const uint8_t mac[], int reason) 1179 { 1180 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1181 1182 if (ss->ss_ops != NULL) { 1183 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 1184 "%s: reason %u", __func__, reason); 1185 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 1186 } 1187 } 1188 1189 /* 1190 * Iterate over the contents of the scan cache. 1191 */ 1192 void 1193 ieee80211_scan_iterate(struct ieee80211vap *vap, 1194 ieee80211_scan_iter_func *f, void *arg) 1195 { 1196 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1197 1198 if (ss->ss_ops != NULL) 1199 ss->ss_ops->scan_iterate(ss, f, arg); 1200 } 1201 1202 /* 1203 * Flush the contents of the scan cache. 1204 */ 1205 void 1206 ieee80211_scan_flush(struct ieee80211vap *vap) 1207 { 1208 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1209 1210 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 1211 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 1212 ss->ss_ops->scan_flush(ss); 1213 } 1214 } 1215 1216 /* 1217 * Check the scan cache for an ap/channel to use; if that 1218 * fails then kick off a new scan. 1219 */ 1220 struct ieee80211_channel * 1221 ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 1222 { 1223 struct ieee80211_scan_state *ss = ic->ic_scan; 1224 1225 IEEE80211_LOCK_ASSERT(ic); 1226 1227 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 1228 /* XXX printf? */ 1229 return NULL; 1230 } 1231 if (ss->ss_ops->scan_pickchan == NULL) { 1232 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 1233 "%s: scan module does not support picking a channel, " 1234 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 1235 return NULL; 1236 } 1237 return ss->ss_ops->scan_pickchan(ss, flags); 1238 } 1239