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_callout(void *); 99 static void scan_signal(struct ieee80211_scan_state *ss); 100 static void scan_task(void *, int); 101 102 MALLOC_DEFINE(M_80211_SCAN, "80211scan", "802.11 scan state"); 103 104 void 105 ieee80211_scan_attach(struct ieee80211com *ic) 106 { 107 struct scan_state *ss; 108 109 ss = (struct scan_state *) kmalloc(sizeof(struct scan_state), 110 M_80211_SCAN, M_INTWAIT | M_ZERO); 111 if (ss == NULL) { 112 ic->ic_scan = NULL; 113 return; 114 } 115 wlan_cv_init(&ss->ss_scan_cv, "scan"); 116 callout_init(&ss->ss_scan_timer); 117 TASK_INIT(&ss->ss_scan_task, 0, scan_task, ss); 118 ic->ic_scan = &ss->base; 119 ss->base.ss_ic = ic; 120 121 ic->ic_scan_curchan = scan_curchan; 122 ic->ic_scan_mindwell = scan_mindwell; 123 } 124 125 void 126 ieee80211_scan_detach(struct ieee80211com *ic) 127 { 128 struct ieee80211_scan_state *ss = ic->ic_scan; 129 130 if (ss != NULL) { 131 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT; 132 scan_signal(ss); 133 ieee80211_draintask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 134 callout_stop(&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 kfree(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 ss = ic->ic_scan; 187 if (ss != NULL && ss->ss_vap == vap) { 188 if (ic->ic_flags & IEEE80211_F_SCAN) { 189 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT; 190 scan_signal(ss); 191 } 192 if (ss->ss_ops != NULL) { 193 ss->ss_ops->scan_detach(ss); 194 ss->ss_ops = NULL; 195 } 196 ss->ss_vap = NULL; 197 } 198 } 199 200 /* 201 * Simple-minded scanner module support. 202 */ 203 static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 204 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 205 "wlan_scan_sta", /* IEEE80211_M_STA */ 206 "wlan_scan_wds", /* IEEE80211_M_WDS */ 207 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 208 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 209 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 210 "wlan_scan_sta", /* IEEE80211_M_MBSS */ 211 }; 212 static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 213 214 const struct ieee80211_scanner * 215 ieee80211_scanner_get(enum ieee80211_opmode mode) 216 { 217 if (mode >= IEEE80211_OPMODE_MAX) 218 return NULL; 219 if (scanners[mode] == NULL) 220 ieee80211_load_module(scan_modnames[mode]); 221 return scanners[mode]; 222 } 223 224 void 225 ieee80211_scanner_register(enum ieee80211_opmode mode, 226 const struct ieee80211_scanner *scan) 227 { 228 if (mode >= IEEE80211_OPMODE_MAX) 229 return; 230 scanners[mode] = scan; 231 } 232 233 void 234 ieee80211_scanner_unregister(enum ieee80211_opmode mode, 235 const struct ieee80211_scanner *scan) 236 { 237 if (mode >= IEEE80211_OPMODE_MAX) 238 return; 239 if (scanners[mode] == scan) 240 scanners[mode] = NULL; 241 } 242 243 void 244 ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 245 { 246 int m; 247 248 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 249 if (scanners[m] == scan) 250 scanners[m] = NULL; 251 } 252 253 /* 254 * Update common scanner state to reflect the current 255 * operating mode. This is called when the state machine 256 * is transitioned to RUN state w/o scanning--e.g. when 257 * operating in monitor mode. The purpose of this is to 258 * ensure later callbacks find ss_ops set to properly 259 * reflect current operating mode. 260 */ 261 static void 262 scan_update_locked(struct ieee80211vap *vap, 263 const struct ieee80211_scanner *scan) 264 { 265 struct ieee80211com *ic = vap->iv_ic; 266 struct ieee80211_scan_state *ss = ic->ic_scan; 267 268 #ifdef IEEE80211_DEBUG 269 if (ss->ss_vap != vap || ss->ss_ops != scan) { 270 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 271 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 272 __func__, 273 ss->ss_vap != NULL ? 274 ss->ss_vap->iv_ifp->if_xname : "none", 275 ss->ss_vap != NULL ? 276 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 277 vap->iv_ifp->if_xname, 278 ieee80211_opmode_name[vap->iv_opmode]); 279 } 280 #endif 281 ss->ss_vap = vap; 282 if (ss->ss_ops != scan) { 283 /* 284 * Switch scanners; detach old, attach new. Special 285 * case where a single scan module implements multiple 286 * policies by using different scan ops but a common 287 * core. We assume if the old and new attach methods 288 * are identical then it's ok to just change ss_ops 289 * and not flush the internal state of the module. 290 */ 291 if (scan == NULL || ss->ss_ops == NULL || 292 ss->ss_ops->scan_attach != scan->scan_attach) { 293 if (ss->ss_ops != NULL) 294 ss->ss_ops->scan_detach(ss); 295 if (scan != NULL && !scan->scan_attach(ss)) { 296 /* XXX attach failure */ 297 /* XXX stat+msg */ 298 scan = NULL; 299 } 300 } 301 ss->ss_ops = scan; 302 } 303 } 304 305 static char 306 channel_type(const struct ieee80211_channel *c) 307 { 308 if (IEEE80211_IS_CHAN_ST(c)) 309 return 'S'; 310 if (IEEE80211_IS_CHAN_108A(c)) 311 return 'T'; 312 if (IEEE80211_IS_CHAN_108G(c)) 313 return 'G'; 314 if (IEEE80211_IS_CHAN_HT(c)) 315 return 'n'; 316 if (IEEE80211_IS_CHAN_A(c)) 317 return 'a'; 318 if (IEEE80211_IS_CHAN_ANYG(c)) 319 return 'g'; 320 if (IEEE80211_IS_CHAN_B(c)) 321 return 'b'; 322 return 'f'; 323 } 324 325 void 326 ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 327 { 328 struct ieee80211com *ic = ss->ss_ic; 329 const char *sep; 330 int i; 331 332 sep = ""; 333 for (i = ss->ss_next; i < ss->ss_last; i++) { 334 const struct ieee80211_channel *c = ss->ss_chans[i]; 335 336 kprintf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 337 channel_type(c)); 338 sep = ", "; 339 } 340 } 341 342 #ifdef IEEE80211_DEBUG 343 static void 344 scan_dump(struct ieee80211_scan_state *ss) 345 { 346 struct ieee80211vap *vap = ss->ss_vap; 347 348 if_printf(vap->iv_ifp, "scan set "); 349 ieee80211_scan_dump_channels(ss); 350 kprintf(" dwell min %lums max %lums\n", 351 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 352 } 353 #endif /* IEEE80211_DEBUG */ 354 355 static void 356 copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 357 int nssid, const struct ieee80211_scan_ssid ssids[]) 358 { 359 if (nssid > IEEE80211_SCAN_MAX_SSID) { 360 /* XXX printf */ 361 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 362 "%s: too many ssid %d, ignoring all of them\n", 363 __func__, nssid); 364 return; 365 } 366 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 367 ss->ss_nssid = nssid; 368 } 369 370 /* 371 * Start a scan unless one is already going. 372 */ 373 static int 374 start_scan_locked(const struct ieee80211_scanner *scan, 375 struct ieee80211vap *vap, int flags, u_int duration, 376 u_int mindwell, u_int maxdwell, 377 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 378 { 379 struct ieee80211com *ic = vap->iv_ic; 380 struct ieee80211_scan_state *ss = ic->ic_scan; 381 382 if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 383 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 384 "%s: scan inhibited by pending channel change\n", __func__); 385 } else if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 386 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 387 "%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n" 388 , __func__ 389 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 390 , duration, mindwell, maxdwell 391 , ieee80211_phymode_name[vap->iv_des_mode] 392 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 393 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 394 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 395 , flags & IEEE80211_SCAN_NOBCAST ? ", nobcast" : "" 396 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 397 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 398 ); 399 400 scan_update_locked(vap, scan); 401 if (ss->ss_ops != NULL) { 402 if ((flags & IEEE80211_SCAN_NOSSID) == 0) 403 copy_ssid(vap, ss, nssid, ssids); 404 405 /* NB: top 4 bits for internal use */ 406 ss->ss_flags = flags & 0xfff; 407 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 408 vap->iv_stats.is_scan_active++; 409 else 410 vap->iv_stats.is_scan_passive++; 411 if (flags & IEEE80211_SCAN_FLUSH) 412 ss->ss_ops->scan_flush(ss); 413 414 /* NB: flush frames rx'd before 1st channel change */ 415 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 416 SCAN_PRIVATE(ss)->ss_duration = duration; 417 ss->ss_next = 0; 418 ss->ss_mindwell = mindwell; 419 ss->ss_maxdwell = maxdwell; 420 /* NB: scan_start must be before the scan runtask */ 421 ss->ss_ops->scan_start(ss, vap); 422 #ifdef IEEE80211_DEBUG 423 if (ieee80211_msg_scan(vap)) 424 scan_dump(ss); 425 #endif /* IEEE80211_DEBUG */ 426 ic->ic_flags |= IEEE80211_F_SCAN; 427 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 428 } 429 } else { 430 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 431 "%s: %s scan already in progress\n", __func__, 432 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 433 } 434 return (ic->ic_flags & IEEE80211_F_SCAN); 435 } 436 437 /* 438 * Start a scan unless one is already going. 439 */ 440 int 441 ieee80211_start_scan(struct ieee80211vap *vap, int flags, 442 u_int duration, u_int mindwell, u_int maxdwell, 443 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 444 { 445 struct ieee80211com *ic = vap->iv_ic; 446 const struct ieee80211_scanner *scan; 447 int result; 448 449 ic = vap->iv_ic; 450 scan = ieee80211_scanner_get(vap->iv_opmode); 451 if (scan == NULL) { 452 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 453 "%s: no scanner support for %s mode\n", 454 __func__, ieee80211_opmode_name[vap->iv_opmode]); 455 /* XXX stat */ 456 return 0; 457 } 458 459 result = start_scan_locked(scan, vap, flags, duration, 460 mindwell, maxdwell, nssid, ssids); 461 462 return result; 463 } 464 465 /* 466 * Check the scan cache for an ap/channel to use; if that 467 * fails then kick off a new scan. 468 */ 469 int 470 ieee80211_check_scan(struct ieee80211vap *vap, int flags, 471 u_int duration, u_int mindwell, u_int maxdwell, 472 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 473 { 474 struct ieee80211com *ic = vap->iv_ic; 475 struct ieee80211_scan_state *ss = ic->ic_scan; 476 const struct ieee80211_scanner *scan; 477 int result; 478 479 scan = ieee80211_scanner_get(vap->iv_opmode); 480 if (scan == NULL) { 481 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 482 "%s: no scanner support for %d mode\n", 483 __func__, vap->iv_opmode); 484 /* XXX stat */ 485 return 0; 486 } 487 488 /* 489 * Check if there's a list of scan candidates already. 490 * XXX want more than the ap we're currently associated with 491 */ 492 493 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 494 "%s: %s scan, %s%s%s%s%s\n" 495 , __func__ 496 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 497 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 498 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 499 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 500 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 501 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 502 ); 503 504 if (ss->ss_ops != scan) { 505 /* XXX re-use cache contents? e.g. adhoc<->sta */ 506 flags |= IEEE80211_SCAN_FLUSH; 507 } 508 scan_update_locked(vap, scan); 509 if (ss->ss_ops != NULL) { 510 /* XXX verify ss_ops matches vap->iv_opmode */ 511 if ((flags & IEEE80211_SCAN_NOSSID) == 0) { 512 /* 513 * Update the ssid list and mark flags so if 514 * we call start_scan it doesn't duplicate work. 515 */ 516 copy_ssid(vap, ss, nssid, ssids); 517 flags |= IEEE80211_SCAN_NOSSID; 518 } 519 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 520 (flags & IEEE80211_SCAN_FLUSH) == 0 && 521 time_before(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 522 /* 523 * We're not currently scanning and the cache is 524 * deemed hot enough to consult. Lock out others 525 * by marking IEEE80211_F_SCAN while we decide if 526 * something is already in the scan cache we can 527 * use. Also discard any frames that might come 528 * in while temporarily marked as scanning. 529 */ 530 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 531 ic->ic_flags |= IEEE80211_F_SCAN; 532 533 /* NB: need to use supplied flags in check */ 534 ss->ss_flags = flags & 0xff; 535 result = ss->ss_ops->scan_end(ss, vap); 536 537 ic->ic_flags &= ~IEEE80211_F_SCAN; 538 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD; 539 if (result) { 540 ieee80211_notify_scan_done(vap); 541 return 1; 542 } 543 } 544 } 545 result = start_scan_locked(scan, vap, flags, duration, 546 mindwell, maxdwell, nssid, ssids); 547 548 return result; 549 } 550 551 /* 552 * Check the scan cache for an ap/channel to use; if that fails 553 * then kick off a scan using the current settings. 554 */ 555 int 556 ieee80211_check_scan_current(struct ieee80211vap *vap) 557 { 558 return ieee80211_check_scan(vap, 559 IEEE80211_SCAN_ACTIVE, 560 IEEE80211_SCAN_FOREVER, 0, 0, 561 vap->iv_des_nssid, vap->iv_des_ssid); 562 } 563 564 /* 565 * Restart a previous scan. If the previous scan completed 566 * then we start again using the existing channel list. 567 */ 568 int 569 ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 570 { 571 struct ieee80211com *ic = vap->iv_ic; 572 struct ieee80211_scan_state *ss = ic->ic_scan; 573 const struct ieee80211_scanner *scan; 574 575 scan = ieee80211_scanner_get(vap->iv_opmode); 576 if (scan == NULL) { 577 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 578 "%s: no scanner support for %d mode\n", 579 __func__, vap->iv_opmode); 580 /* XXX stat */ 581 return 0; 582 } 583 584 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 585 u_int duration; 586 /* 587 * Go off-channel for a fixed interval that is large 588 * enough to catch most ap's but short enough that 589 * we can return on-channel before our listen interval 590 * expires. 591 */ 592 duration = IEEE80211_SCAN_OFFCHANNEL; 593 594 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 595 "%s: %s scan, ticks %u duration %u\n", __func__, 596 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive", 597 ticks, duration); 598 599 scan_update_locked(vap, scan); 600 if (ss->ss_ops != NULL) { 601 ss->ss_vap = vap; 602 /* 603 * A background scan does not select a new sta; it 604 * just refreshes the scan cache. Also, indicate 605 * the scan logic should follow the beacon schedule: 606 * we go off-channel and scan for a while, then 607 * return to the bss channel to receive a beacon, 608 * then go off-channel again. All during this time 609 * we notify the ap we're in power save mode. When 610 * the scan is complete we leave power save mode. 611 * If any beacon indicates there are frames pending 612 * for us then we drop out of power save mode 613 * (and background scan) automatically by way of the 614 * usual sta power save logic. 615 */ 616 ss->ss_flags |= IEEE80211_SCAN_NOPICK 617 | IEEE80211_SCAN_BGSCAN 618 | flags 619 ; 620 /* if previous scan completed, restart */ 621 if (ss->ss_next >= ss->ss_last) { 622 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 623 vap->iv_stats.is_scan_active++; 624 else 625 vap->iv_stats.is_scan_passive++; 626 /* 627 * NB: beware of the scan cache being flushed; 628 * if the channel list is empty use the 629 * scan_start method to populate it. 630 */ 631 ss->ss_next = 0; 632 if (ss->ss_last != 0) 633 ss->ss_ops->scan_restart(ss, vap); 634 else { 635 ss->ss_ops->scan_start(ss, vap); 636 #ifdef IEEE80211_DEBUG 637 if (ieee80211_msg_scan(vap)) 638 scan_dump(ss); 639 #endif /* IEEE80211_DEBUG */ 640 } 641 } 642 /* NB: flush frames rx'd before 1st channel change */ 643 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 644 SCAN_PRIVATE(ss)->ss_duration = duration; 645 ss->ss_maxdwell = duration; 646 ic->ic_flags |= IEEE80211_F_SCAN; 647 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN; 648 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 649 } else { 650 /* XXX msg+stat */ 651 } 652 } else { 653 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 654 "%s: %s scan already in progress\n", __func__, 655 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 656 } 657 658 /* NB: racey, does it matter? */ 659 return (ic->ic_flags & IEEE80211_F_SCAN); 660 } 661 662 /* 663 * Cancel any scan currently going on for the specified vap. 664 */ 665 void 666 ieee80211_cancel_scan(struct ieee80211vap *vap) 667 { 668 struct ieee80211com *ic = vap->iv_ic; 669 struct ieee80211_scan_state *ss = ic->ic_scan; 670 671 if ((ic->ic_flags & IEEE80211_F_SCAN) && 672 ss->ss_vap == vap && 673 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 674 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 675 "%s: cancel %s scan\n", __func__, 676 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 677 "active" : "passive"); 678 679 /* clear bg scan NOPICK and mark cancel request */ 680 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 681 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 682 /* wake up the scan task */ 683 scan_signal(ss); 684 } 685 } 686 687 /* 688 * Cancel any scan currently going on. 689 */ 690 void 691 ieee80211_cancel_anyscan(struct ieee80211vap *vap) 692 { 693 struct ieee80211com *ic = vap->iv_ic; 694 struct ieee80211_scan_state *ss = ic->ic_scan; 695 696 if ((ic->ic_flags & IEEE80211_F_SCAN) && 697 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 698 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 699 "%s: cancel %s scan\n", __func__, 700 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 701 "active" : "passive"); 702 703 /* clear bg scan NOPICK and mark cancel request */ 704 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 705 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 706 /* wake up the scan task */ 707 scan_signal(ss); 708 } 709 } 710 711 /* 712 * Public access to scan_next for drivers that manage 713 * scanning themselves (e.g. for firmware-based devices). 714 */ 715 void 716 ieee80211_scan_next(struct ieee80211vap *vap) 717 { 718 struct ieee80211com *ic = vap->iv_ic; 719 struct ieee80211_scan_state *ss = ic->ic_scan; 720 721 /* wake up the scan task */ 722 scan_signal(ss); 723 } 724 725 /* 726 * Public access to scan_next for drivers that are not able to scan single 727 * channels (e.g. for firmware-based devices). 728 */ 729 void 730 ieee80211_scan_done(struct ieee80211vap *vap) 731 { 732 struct ieee80211com *ic = vap->iv_ic; 733 struct ieee80211_scan_state *ss; 734 735 ss = ic->ic_scan; 736 ss->ss_next = ss->ss_last; /* all channels are complete */ 737 scan_signal(ss); 738 } 739 740 /* 741 * Probe the curent channel, if allowed, while scanning. 742 * If the channel is not marked passive-only then send 743 * a probe request immediately. Otherwise mark state and 744 * listen for beacons on the channel; if we receive something 745 * then we'll transmit a probe request. 746 */ 747 void 748 ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 749 { 750 struct ieee80211com *ic = vap->iv_ic; 751 struct ieee80211_scan_state *ss = ic->ic_scan; 752 struct ifnet *ifp = vap->iv_ifp; 753 int i; 754 755 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 756 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 757 return; 758 } 759 /* 760 * Send directed probe requests followed by any 761 * broadcast probe request. 762 * XXX remove dependence on ic/vap->iv_bss 763 */ 764 for (i = 0; i < ss->ss_nssid; i++) 765 ieee80211_send_probereq(vap->iv_bss, 766 vap->iv_myaddr, ifp->if_broadcastaddr, 767 ifp->if_broadcastaddr, 768 ss->ss_ssid[i].ssid, ss->ss_ssid[i].len); 769 if ((ss->ss_flags & IEEE80211_SCAN_NOBCAST) == 0) 770 ieee80211_send_probereq(vap->iv_bss, 771 vap->iv_myaddr, ifp->if_broadcastaddr, 772 ifp->if_broadcastaddr, 773 "", 0); 774 } 775 776 /* 777 * Scan curchan. If this is an active scan and the channel 778 * is not marked passive then send probe request frame(s). 779 * Arrange for the channel change after maxdwell ticks. 780 */ 781 static void 782 scan_curchan(struct ieee80211_scan_state *ss, unsigned long maxdwell) 783 { 784 struct ieee80211vap *vap = ss->ss_vap; 785 786 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 787 ieee80211_probe_curchan(vap, 0); 788 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 789 maxdwell, scan_signal_callout, ss); 790 } 791 792 static void 793 scan_signal_callout(void *arg) 794 { 795 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 796 797 wlan_serialize_enter(); 798 scan_signal(ss); 799 wlan_serialize_exit(); 800 } 801 802 static void 803 scan_signal(struct ieee80211_scan_state *ss) 804 { 805 wlan_cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv, 0); 806 } 807 808 /* 809 * Handle mindwell requirements completed; initiate a channel 810 * change to the next channel asap. 811 */ 812 static void 813 scan_mindwell(struct ieee80211_scan_state *ss) 814 { 815 struct ieee80211com *ic = ss->ss_ic; 816 817 ic = ss->ss_ic; 818 scan_signal(ss); 819 } 820 821 static void 822 scan_task(void *arg, int pending) 823 { 824 #define ISCAN_REP (ISCAN_MINDWELL | ISCAN_DISCARD) 825 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 826 struct ieee80211vap *vap; 827 struct ieee80211com *ic; 828 struct ieee80211_channel *chan; 829 unsigned long maxdwell, scanend; 830 int scandone = 0; 831 832 wlan_serialize_enter(); 833 vap = ss->ss_vap; 834 ic = ss->ss_ic; 835 836 if (vap == NULL || (ic->ic_flags & IEEE80211_F_SCAN) == 0 || 837 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)) { 838 /* Cancelled before we started */ 839 goto done; 840 } 841 842 if (ss->ss_next == ss->ss_last) { 843 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 844 "%s: no channels to scan\n", __func__); 845 goto done; 846 } 847 848 if (vap->iv_opmode == IEEE80211_M_STA && 849 vap->iv_state == IEEE80211_S_RUN) { 850 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) { 851 /* Enable station power save mode */ 852 ieee80211_sta_pwrsave(vap, 1); 853 /* 854 * Use an 1ms delay so the null data frame has a chance 855 * to go out. Minimum one tick. 856 * XXX Should use M_TXCB mechanism to eliminate this. 857 */ 858 wlan_cv_timedwait(&SCAN_PRIVATE(ss)->ss_scan_cv, 859 hz / 1000 + 1); 860 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 861 goto done; 862 } 863 } 864 865 scanend = ticks + SCAN_PRIVATE(ss)->ss_duration; 866 ic->ic_scan_start(ic); /* notify driver */ 867 868 for (;;) { 869 scandone = (ss->ss_next >= ss->ss_last) || 870 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0; 871 if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) || 872 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) || 873 time_after(ticks + ss->ss_mindwell, scanend)) 874 break; 875 876 chan = ss->ss_chans[ss->ss_next++]; 877 878 /* 879 * Watch for truncation due to the scan end time. 880 */ 881 if (time_after(ticks + ss->ss_maxdwell, scanend)) 882 maxdwell = scanend - ticks; 883 else 884 maxdwell = ss->ss_maxdwell; 885 886 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 887 "%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n", 888 __func__, 889 ieee80211_chan2ieee(ic, ic->ic_curchan), 890 channel_type(ic->ic_curchan), 891 ieee80211_chan2ieee(ic, chan), channel_type(chan), 892 (ss->ss_flags & IEEE80211_SCAN_ACTIVE) && 893 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ? 894 "active" : "passive", 895 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell)); 896 897 /* 898 * Potentially change channel and phy mode. 899 */ 900 ic->ic_curchan = chan; 901 ic->ic_rt = ieee80211_get_ratetable(chan); 902 /* 903 * Perform the channel change and scan unlocked so the driver 904 * may sleep. Once set_channel returns the hardware has 905 * completed the channel change. 906 */ 907 ic->ic_set_channel(ic); 908 ieee80211_radiotap_chan_change(ic); 909 910 /* 911 * Scan curchan. Drivers for "intelligent hardware" 912 * override ic_scan_curchan to tell the device to do 913 * the work. Otherwise we manage the work outselves; 914 * sending a probe request (as needed), and arming the 915 * timeout to switch channels after maxdwell ticks. 916 * 917 * scan_curchan should only pause for the time required to 918 * prepare/initiate the hardware for the scan (if at all), the 919 * below condvar is used to sleep for the channels dwell time 920 * and allows it to be signalled for abort. 921 */ 922 ic->ic_scan_curchan(ss, maxdwell); 923 924 SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell; 925 /* clear mindwell lock and initial channel change flush */ 926 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 927 928 if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT))) 929 continue; 930 931 /* Wait to be signalled to scan the next channel */ 932 wlan_cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv); 933 } 934 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 935 goto done; 936 937 ic->ic_scan_end(ic); /* notify driver */ 938 939 /* 940 * Record scan complete time. Note that we also do 941 * this when canceled so any background scan will 942 * not be restarted for a while. 943 */ 944 if (scandone) 945 ic->ic_lastscan = ticks; 946 /* return to the bss channel */ 947 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 948 ic->ic_curchan != ic->ic_bsschan) { 949 ieee80211_setupcurchan(ic, ic->ic_bsschan); 950 ic->ic_set_channel(ic); 951 ieee80211_radiotap_chan_change(ic); 952 } 953 /* clear internal flags and any indication of a pick */ 954 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 955 ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK; 956 957 /* 958 * If not canceled and scan completed, do post-processing. 959 * If the callback function returns 0, then it wants to 960 * continue/restart scanning. Unfortunately we needed to 961 * notify the driver to end the scan above to avoid having 962 * rx frames alter the scan candidate list. 963 */ 964 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 && 965 !ss->ss_ops->scan_end(ss, vap) && 966 (ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 && 967 time_before(ticks + ss->ss_mindwell, scanend)) { 968 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 969 "%s: done, restart " 970 "[ticks %u, dwell min %lu scanend %lu]\n", 971 __func__, 972 ticks, ss->ss_mindwell, scanend); 973 ss->ss_next = 0; /* reset to begining */ 974 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 975 vap->iv_stats.is_scan_active++; 976 else 977 vap->iv_stats.is_scan_passive++; 978 979 ss->ss_ops->scan_restart(ss, vap); /* XXX? */ 980 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 981 goto done2; 982 } 983 984 /* past here, scandone is ``true'' if not in bg mode */ 985 if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0) 986 scandone = 1; 987 988 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 989 "%s: %s, [ticks %u, dwell min %lu scanend %lu]\n", 990 __func__, scandone ? "done" : "stopped", 991 ticks, ss->ss_mindwell, scanend); 992 993 /* 994 * Clear the SCAN bit first in case frames are 995 * pending on the station power save queue. If 996 * we defer this then the dispatch of the frames 997 * may generate a request to cancel scanning. 998 */ 999 done: 1000 ic->ic_flags &= ~IEEE80211_F_SCAN; 1001 /* 1002 * Drop out of power save mode when a scan has 1003 * completed. If this scan was prematurely terminated 1004 * because it is a background scan then don't notify 1005 * the ap; we'll either return to scanning after we 1006 * receive the beacon frame or we'll drop out of power 1007 * save mode because the beacon indicates we have frames 1008 * waiting for us. 1009 */ 1010 if (scandone) { 1011 ieee80211_sta_pwrsave(vap, 0); 1012 if (ss->ss_next >= ss->ss_last) { 1013 ieee80211_notify_scan_done(vap); 1014 ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN; 1015 } 1016 } 1017 SCAN_PRIVATE(ss)->ss_iflags &= ~(ISCAN_CANCEL|ISCAN_ABORT); 1018 ss->ss_flags &= ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST); 1019 done2: 1020 wlan_serialize_exit(); 1021 #undef ISCAN_REP 1022 } 1023 1024 #ifdef IEEE80211_DEBUG 1025 static void 1026 dump_country(const uint8_t *ie) 1027 { 1028 const struct ieee80211_country_ie *cie = 1029 (const struct ieee80211_country_ie *) ie; 1030 int i, nbands, schan, nchan; 1031 1032 if (cie->len < 3) { 1033 kprintf(" <bogus country ie, len %d>", cie->len); 1034 return; 1035 } 1036 kprintf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 1037 nbands = (cie->len - 3) / sizeof(cie->band[0]); 1038 for (i = 0; i < nbands; i++) { 1039 schan = cie->band[i].schan; 1040 nchan = cie->band[i].nchan; 1041 if (nchan != 1) 1042 kprintf(" %u-%u,%u", schan, schan + nchan-1, 1043 cie->band[i].maxtxpwr); 1044 else 1045 kprintf(" %u,%u", schan, cie->band[i].maxtxpwr); 1046 } 1047 kprintf("]"); 1048 } 1049 1050 static void 1051 dump_probe_beacon(uint8_t subtype, int isnew, 1052 const uint8_t mac[IEEE80211_ADDR_LEN], 1053 const struct ieee80211_scanparams *sp, int rssi) 1054 { 1055 1056 kprintf("[%6D] %s%s on chan %u (bss chan %u) ", 1057 mac, ":", isnew ? "new " : "", 1058 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], 1059 sp->chan, sp->bchan); 1060 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 1061 kprintf(" rssi %d\n", rssi); 1062 1063 if (isnew) { 1064 kprintf("[%6D] caps 0x%x bintval %u erp 0x%x", 1065 mac, ":", sp->capinfo, sp->bintval, sp->erp); 1066 if (sp->country != NULL) 1067 dump_country(sp->country); 1068 kprintf("\n"); 1069 } 1070 } 1071 #endif /* IEEE80211_DEBUG */ 1072 1073 /* 1074 * Process a beacon or probe response frame. 1075 */ 1076 void 1077 ieee80211_add_scan(struct ieee80211vap *vap, 1078 const struct ieee80211_scanparams *sp, 1079 const struct ieee80211_frame *wh, 1080 int subtype, int rssi, int noise) 1081 { 1082 struct ieee80211com *ic = vap->iv_ic; 1083 struct ieee80211_scan_state *ss = ic->ic_scan; 1084 1085 /* XXX locking */ 1086 /* 1087 * Frames received during startup are discarded to avoid 1088 * using scan state setup on the initial entry to the timer 1089 * callback. This can occur because the device may enable 1090 * rx prior to our doing the initial channel change in the 1091 * timer routine. 1092 */ 1093 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD) 1094 return; 1095 #ifdef IEEE80211_DEBUG 1096 if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN)) 1097 dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi); 1098 #endif 1099 if (ss->ss_ops != NULL && 1100 ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise)) { 1101 /* 1102 * If we've reached the min dwell time terminate 1103 * the timer so we'll switch to the next channel. 1104 */ 1105 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 && 1106 time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) { 1107 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1108 "%s: chan %3d%c min dwell met (%u > %lu)\n", 1109 __func__, 1110 ieee80211_chan2ieee(ic, ic->ic_curchan), 1111 channel_type(ic->ic_curchan), 1112 ticks, SCAN_PRIVATE(ss)->ss_chanmindwell); 1113 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL; 1114 /* 1115 * NB: trigger at next clock tick or wait for the 1116 * hardware. 1117 */ 1118 ic->ic_scan_mindwell(ss); 1119 } 1120 } 1121 } 1122 1123 /* 1124 * Timeout/age scan cache entries; called from sta timeout 1125 * timer (XXX should be self-contained). 1126 */ 1127 void 1128 ieee80211_scan_timeout(struct ieee80211com *ic) 1129 { 1130 struct ieee80211_scan_state *ss = ic->ic_scan; 1131 1132 if (ss->ss_ops != NULL) 1133 ss->ss_ops->scan_age(ss); 1134 } 1135 1136 /* 1137 * Mark a scan cache entry after a successful associate. 1138 */ 1139 void 1140 ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 1141 { 1142 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1143 1144 if (ss->ss_ops != NULL) { 1145 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 1146 mac, "%s", __func__); 1147 ss->ss_ops->scan_assoc_success(ss, mac); 1148 } 1149 } 1150 1151 /* 1152 * Demerit a scan cache entry after failing to associate. 1153 */ 1154 void 1155 ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 1156 const uint8_t mac[], int reason) 1157 { 1158 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1159 1160 if (ss->ss_ops != NULL) { 1161 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 1162 "%s: reason %u", __func__, reason); 1163 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 1164 } 1165 } 1166 1167 /* 1168 * Iterate over the contents of the scan cache. 1169 */ 1170 void 1171 ieee80211_scan_iterate(struct ieee80211vap *vap, 1172 ieee80211_scan_iter_func *f, void *arg) 1173 { 1174 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1175 1176 if (ss->ss_ops != NULL) 1177 ss->ss_ops->scan_iterate(ss, f, arg); 1178 } 1179 1180 /* 1181 * Flush the contents of the scan cache. 1182 */ 1183 void 1184 ieee80211_scan_flush(struct ieee80211vap *vap) 1185 { 1186 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1187 1188 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 1189 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 1190 ss->ss_ops->scan_flush(ss); 1191 } 1192 } 1193 1194 /* 1195 * Check the scan cache for an ap/channel to use; if that 1196 * fails then kick off a new scan. 1197 */ 1198 struct ieee80211_channel * 1199 ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 1200 { 1201 struct ieee80211_scan_state *ss = ic->ic_scan; 1202 1203 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 1204 /* XXX printf? */ 1205 return NULL; 1206 } 1207 if (ss->ss_ops->scan_pickchan == NULL) { 1208 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 1209 "%s: scan module does not support picking a channel, " 1210 "opmode %d\n", __func__, ss->ss_vap->iv_opmode); 1211 return NULL; 1212 } 1213 return ss->ss_ops->scan_pickchan(ss, flags); 1214 } 1215