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 */ 27 28 /* 29 * IEEE 802.11 scanning support. 30 */ 31 #include "opt_wlan.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/proc.h> 36 #include <sys/kernel.h> 37 38 #include <sys/condvar.h> 39 #include <sys/socket.h> 40 41 #include <net/if.h> 42 #include <net/if_media.h> 43 #include <net/ethernet.h> 44 #include <net/route.h> 45 46 #include <netproto/802_11/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_callout(void *); 98 static void scan_signal(struct ieee80211_scan_state *ss); 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 wlan_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 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT; 131 scan_signal(ss); 132 ieee80211_draintask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 133 callout_stop(&SCAN_PRIVATE(ss)->ss_scan_timer); 134 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, 135 ("scan still running")); 136 if (ss->ss_ops != NULL) { 137 ss->ss_ops->scan_detach(ss); 138 ss->ss_ops = NULL; 139 } 140 ic->ic_scan = NULL; 141 kfree(SCAN_PRIVATE(ss), M_80211_SCAN); 142 } 143 } 144 145 static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = { 146 [IEEE80211_MODE_11A] = { .rssi = ROAM_RSSI_11A_DEFAULT, 147 .rate = ROAM_RATE_11A_DEFAULT }, 148 [IEEE80211_MODE_11G] = { .rssi = ROAM_RSSI_11B_DEFAULT, 149 .rate = ROAM_RATE_11B_DEFAULT }, 150 [IEEE80211_MODE_11B] = { .rssi = ROAM_RSSI_11BONLY_DEFAULT, 151 .rate = ROAM_RATE_11BONLY_DEFAULT }, 152 [IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT, 153 .rate = ROAM_RATE_11A_DEFAULT }, 154 [IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT, 155 .rate = ROAM_RATE_11A_DEFAULT }, 156 [IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT, 157 .rate = ROAM_RATE_11A_DEFAULT }, 158 [IEEE80211_MODE_HALF] = { .rssi = ROAM_RSSI_11A_DEFAULT, 159 .rate = ROAM_RATE_HALF_DEFAULT }, 160 [IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT, 161 .rate = ROAM_RATE_QUARTER_DEFAULT }, 162 [IEEE80211_MODE_11NA] = { .rssi = ROAM_RSSI_11A_DEFAULT, 163 .rate = ROAM_MCS_11N_DEFAULT }, 164 [IEEE80211_MODE_11NG] = { .rssi = ROAM_RSSI_11B_DEFAULT, 165 .rate = ROAM_MCS_11N_DEFAULT }, 166 }; 167 168 void 169 ieee80211_scan_vattach(struct ieee80211vap *vap) 170 { 171 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz; 172 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz; 173 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz; 174 175 vap->iv_roaming = IEEE80211_ROAMING_AUTO; 176 memcpy(vap->iv_roamparms, defroam, sizeof(defroam)); 177 } 178 179 void 180 ieee80211_scan_vdetach(struct ieee80211vap *vap) 181 { 182 struct ieee80211com *ic = vap->iv_ic; 183 struct ieee80211_scan_state *ss; 184 185 ss = ic->ic_scan; 186 if (ss != NULL && ss->ss_vap == vap) { 187 if (ic->ic_flags & IEEE80211_F_SCAN) { 188 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT; 189 scan_signal(ss); 190 } 191 if (ss->ss_ops != NULL) { 192 ss->ss_ops->scan_detach(ss); 193 ss->ss_ops = NULL; 194 } 195 ss->ss_vap = NULL; 196 } 197 } 198 199 /* 200 * Simple-minded scanner module support. 201 */ 202 static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 203 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 204 "wlan_scan_sta", /* IEEE80211_M_STA */ 205 "wlan_scan_wds", /* IEEE80211_M_WDS */ 206 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 207 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 208 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 209 "wlan_scan_sta", /* IEEE80211_M_MBSS */ 210 }; 211 static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 212 213 const struct ieee80211_scanner * 214 ieee80211_scanner_get(enum ieee80211_opmode mode) 215 { 216 if (mode >= IEEE80211_OPMODE_MAX) 217 return NULL; 218 if (scanners[mode] == NULL) 219 ieee80211_load_module(scan_modnames[mode]); 220 return scanners[mode]; 221 } 222 223 void 224 ieee80211_scanner_register(enum ieee80211_opmode mode, 225 const struct ieee80211_scanner *scan) 226 { 227 if (mode >= IEEE80211_OPMODE_MAX) 228 return; 229 scanners[mode] = scan; 230 } 231 232 void 233 ieee80211_scanner_unregister(enum ieee80211_opmode mode, 234 const struct ieee80211_scanner *scan) 235 { 236 if (mode >= IEEE80211_OPMODE_MAX) 237 return; 238 if (scanners[mode] == scan) 239 scanners[mode] = NULL; 240 } 241 242 void 243 ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 244 { 245 int m; 246 247 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 248 if (scanners[m] == scan) 249 scanners[m] = NULL; 250 } 251 252 /* 253 * Update common scanner state to reflect the current 254 * operating mode. This is called when the state machine 255 * is transitioned to RUN state w/o scanning--e.g. when 256 * operating in monitor mode. The purpose of this is to 257 * ensure later callbacks find ss_ops set to properly 258 * reflect current operating mode. 259 */ 260 static void 261 scan_update_locked(struct ieee80211vap *vap, 262 const struct ieee80211_scanner *scan) 263 { 264 struct ieee80211com *ic = vap->iv_ic; 265 struct ieee80211_scan_state *ss = ic->ic_scan; 266 267 #ifdef IEEE80211_DEBUG 268 if (ss->ss_vap != vap || ss->ss_ops != scan) { 269 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 270 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 271 __func__, 272 ss->ss_vap != NULL ? 273 ss->ss_vap->iv_ifp->if_xname : "none", 274 ss->ss_vap != NULL ? 275 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 276 vap->iv_ifp->if_xname, 277 ieee80211_opmode_name[vap->iv_opmode]); 278 } 279 #endif 280 ss->ss_vap = vap; 281 if (ss->ss_ops != scan) { 282 /* 283 * Switch scanners; detach old, attach new. Special 284 * case where a single scan module implements multiple 285 * policies by using different scan ops but a common 286 * core. We assume if the old and new attach methods 287 * are identical then it's ok to just change ss_ops 288 * and not flush the internal state of the module. 289 */ 290 if (scan == NULL || ss->ss_ops == NULL || 291 ss->ss_ops->scan_attach != scan->scan_attach) { 292 if (ss->ss_ops != NULL) 293 ss->ss_ops->scan_detach(ss); 294 if (scan != NULL && !scan->scan_attach(ss)) { 295 /* XXX attach failure */ 296 /* XXX stat+msg */ 297 scan = NULL; 298 } 299 } 300 ss->ss_ops = scan; 301 } 302 } 303 304 static char 305 channel_type(const struct ieee80211_channel *c) 306 { 307 if (IEEE80211_IS_CHAN_ST(c)) 308 return 'S'; 309 if (IEEE80211_IS_CHAN_108A(c)) 310 return 'T'; 311 if (IEEE80211_IS_CHAN_108G(c)) 312 return 'G'; 313 if (IEEE80211_IS_CHAN_HT(c)) 314 return 'n'; 315 if (IEEE80211_IS_CHAN_A(c)) 316 return 'a'; 317 if (IEEE80211_IS_CHAN_ANYG(c)) 318 return 'g'; 319 if (IEEE80211_IS_CHAN_B(c)) 320 return 'b'; 321 return 'f'; 322 } 323 324 void 325 ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 326 { 327 struct ieee80211com *ic = ss->ss_ic; 328 const char *sep; 329 int i; 330 331 sep = ""; 332 for (i = ss->ss_next; i < ss->ss_last; i++) { 333 const struct ieee80211_channel *c = ss->ss_chans[i]; 334 335 kprintf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 336 channel_type(c)); 337 sep = ", "; 338 } 339 } 340 341 #ifdef IEEE80211_DEBUG 342 static void 343 scan_dump(struct ieee80211_scan_state *ss) 344 { 345 struct ieee80211vap *vap = ss->ss_vap; 346 347 if_printf(vap->iv_ifp, "scan set "); 348 ieee80211_scan_dump_channels(ss); 349 kprintf(" dwell min %lums max %lums\n", 350 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 351 } 352 #endif /* IEEE80211_DEBUG */ 353 354 static void 355 copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 356 int nssid, const struct ieee80211_scan_ssid ssids[]) 357 { 358 if (nssid > IEEE80211_SCAN_MAX_SSID) { 359 /* XXX printf */ 360 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 361 "%s: too many ssid %d, ignoring all of them\n", 362 __func__, nssid); 363 return; 364 } 365 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 366 ss->ss_nssid = nssid; 367 } 368 369 /* 370 * Start a scan unless one is already going. 371 */ 372 static int 373 start_scan_locked(const struct ieee80211_scanner *scan, 374 struct ieee80211vap *vap, int flags, u_int duration, 375 u_int mindwell, u_int maxdwell, 376 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 377 { 378 struct ieee80211com *ic = vap->iv_ic; 379 struct ieee80211_scan_state *ss = ic->ic_scan; 380 381 if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 382 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 383 "%s: scan inhibited by pending channel change\n", __func__); 384 } else if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 385 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 386 "%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n" 387 , __func__ 388 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 389 , duration, mindwell, maxdwell 390 , ieee80211_phymode_name[vap->iv_des_mode] 391 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 392 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 393 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 394 , flags & IEEE80211_SCAN_NOBCAST ? ", nobcast" : "" 395 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 396 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 397 ); 398 399 scan_update_locked(vap, scan); 400 if (ss->ss_ops != NULL) { 401 if ((flags & IEEE80211_SCAN_NOSSID) == 0) 402 copy_ssid(vap, ss, nssid, ssids); 403 404 /* NB: top 4 bits for internal use */ 405 ss->ss_flags = flags & 0xfff; 406 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 407 vap->iv_stats.is_scan_active++; 408 else 409 vap->iv_stats.is_scan_passive++; 410 if (flags & IEEE80211_SCAN_FLUSH) 411 ss->ss_ops->scan_flush(ss); 412 413 /* NB: flush frames rx'd before 1st channel change */ 414 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 415 SCAN_PRIVATE(ss)->ss_duration = duration; 416 ss->ss_next = 0; 417 ss->ss_mindwell = mindwell; 418 ss->ss_maxdwell = maxdwell; 419 /* NB: scan_start must be before the scan runtask */ 420 ss->ss_ops->scan_start(ss, vap); 421 #ifdef IEEE80211_DEBUG 422 if (ieee80211_msg_scan(vap)) 423 scan_dump(ss); 424 #endif /* IEEE80211_DEBUG */ 425 ic->ic_flags |= IEEE80211_F_SCAN; 426 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 427 } 428 } else { 429 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 430 "%s: %s scan already in progress\n", __func__, 431 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 432 } 433 return (ic->ic_flags & IEEE80211_F_SCAN); 434 } 435 436 /* 437 * Start a scan unless one is already going. 438 */ 439 int 440 ieee80211_start_scan(struct ieee80211vap *vap, int flags, 441 u_int duration, u_int mindwell, u_int maxdwell, 442 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 443 { 444 struct ieee80211com *ic = vap->iv_ic; 445 const struct ieee80211_scanner *scan; 446 int result; 447 448 ic = vap->iv_ic; 449 scan = ieee80211_scanner_get(vap->iv_opmode); 450 if (scan == NULL) { 451 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 452 "%s: no scanner support for %s mode\n", 453 __func__, ieee80211_opmode_name[vap->iv_opmode]); 454 /* XXX stat */ 455 return 0; 456 } 457 458 result = start_scan_locked(scan, vap, flags, duration, 459 mindwell, maxdwell, nssid, ssids); 460 461 return result; 462 } 463 464 /* 465 * Check the scan cache for an ap/channel to use; if that 466 * fails then kick off a new scan. 467 */ 468 int 469 ieee80211_check_scan(struct ieee80211vap *vap, int flags, 470 u_int duration, u_int mindwell, u_int maxdwell, 471 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 472 { 473 struct ieee80211com *ic = vap->iv_ic; 474 struct ieee80211_scan_state *ss = ic->ic_scan; 475 const struct ieee80211_scanner *scan; 476 int result; 477 478 scan = ieee80211_scanner_get(vap->iv_opmode); 479 if (scan == NULL) { 480 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 481 "%s: no scanner support for %d mode\n", 482 __func__, vap->iv_opmode); 483 /* XXX stat */ 484 return 0; 485 } 486 487 /* 488 * Check if there's a list of scan candidates already. 489 * XXX want more than the ap we're currently associated with 490 */ 491 492 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 493 "%s: %s scan, %s%s%s%s%s\n" 494 , __func__ 495 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 496 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 497 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 498 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 499 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 500 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 501 ); 502 503 if (ss->ss_ops != scan) { 504 /* XXX re-use cache contents? e.g. adhoc<->sta */ 505 flags |= IEEE80211_SCAN_FLUSH; 506 } 507 scan_update_locked(vap, scan); 508 if (ss->ss_ops != NULL) { 509 /* XXX verify ss_ops matches vap->iv_opmode */ 510 if ((flags & IEEE80211_SCAN_NOSSID) == 0) { 511 /* 512 * Update the ssid list and mark flags so if 513 * we call start_scan it doesn't duplicate work. 514 */ 515 copy_ssid(vap, ss, nssid, ssids); 516 flags |= IEEE80211_SCAN_NOSSID; 517 } 518 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 519 (flags & IEEE80211_SCAN_FLUSH) == 0 && 520 time_before(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 521 /* 522 * We're not currently scanning and the cache is 523 * deemed hot enough to consult. Lock out others 524 * by marking IEEE80211_F_SCAN while we decide if 525 * something is already in the scan cache we can 526 * use. Also discard any frames that might come 527 * in while temporarily marked as scanning. 528 */ 529 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 530 ic->ic_flags |= IEEE80211_F_SCAN; 531 532 /* NB: need to use supplied flags in check */ 533 ss->ss_flags = flags & 0xff; 534 result = ss->ss_ops->scan_end(ss, vap); 535 536 ic->ic_flags &= ~IEEE80211_F_SCAN; 537 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD; 538 if (result) { 539 ieee80211_notify_scan_done(vap); 540 return 1; 541 } 542 } 543 } 544 result = start_scan_locked(scan, vap, flags, duration, 545 mindwell, maxdwell, nssid, ssids); 546 547 return result; 548 } 549 550 /* 551 * Check the scan cache for an ap/channel to use; if that fails 552 * then kick off a scan using the current settings. 553 */ 554 int 555 ieee80211_check_scan_current(struct ieee80211vap *vap) 556 { 557 return ieee80211_check_scan(vap, 558 IEEE80211_SCAN_ACTIVE, 559 IEEE80211_SCAN_FOREVER, 0, 0, 560 vap->iv_des_nssid, vap->iv_des_ssid); 561 } 562 563 /* 564 * Restart a previous scan. If the previous scan completed 565 * then we start again using the existing channel list. 566 */ 567 int 568 ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 569 { 570 struct ieee80211com *ic = vap->iv_ic; 571 struct ieee80211_scan_state *ss = ic->ic_scan; 572 const struct ieee80211_scanner *scan; 573 574 scan = ieee80211_scanner_get(vap->iv_opmode); 575 if (scan == NULL) { 576 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 577 "%s: no scanner support for %d mode\n", 578 __func__, vap->iv_opmode); 579 /* XXX stat */ 580 return 0; 581 } 582 583 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 584 u_int duration; 585 /* 586 * Go off-channel for a fixed interval that is large 587 * enough to catch most ap's but short enough that 588 * we can return on-channel before our listen interval 589 * expires. 590 */ 591 duration = IEEE80211_SCAN_OFFCHANNEL; 592 593 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 594 "%s: %s scan, ticks %u duration %u\n", __func__, 595 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive", 596 ticks, duration); 597 598 scan_update_locked(vap, scan); 599 if (ss->ss_ops != NULL) { 600 ss->ss_vap = vap; 601 /* 602 * A background scan does not select a new sta; it 603 * just refreshes the scan cache. Also, indicate 604 * the scan logic should follow the beacon schedule: 605 * we go off-channel and scan for a while, then 606 * return to the bss channel to receive a beacon, 607 * then go off-channel again. All during this time 608 * we notify the ap we're in power save mode. When 609 * the scan is complete we leave power save mode. 610 * If any beacon indicates there are frames pending 611 * for us then we drop out of power save mode 612 * (and background scan) automatically by way of the 613 * usual sta power save logic. 614 */ 615 ss->ss_flags |= IEEE80211_SCAN_NOPICK 616 | IEEE80211_SCAN_BGSCAN 617 | flags 618 ; 619 /* if previous scan completed, restart */ 620 if (ss->ss_next >= ss->ss_last) { 621 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 622 vap->iv_stats.is_scan_active++; 623 else 624 vap->iv_stats.is_scan_passive++; 625 /* 626 * NB: beware of the scan cache being flushed; 627 * if the channel list is empty use the 628 * scan_start method to populate it. 629 */ 630 ss->ss_next = 0; 631 if (ss->ss_last != 0) 632 ss->ss_ops->scan_restart(ss, vap); 633 else { 634 ss->ss_ops->scan_start(ss, vap); 635 #ifdef IEEE80211_DEBUG 636 if (ieee80211_msg_scan(vap)) 637 scan_dump(ss); 638 #endif /* IEEE80211_DEBUG */ 639 } 640 } 641 /* NB: flush frames rx'd before 1st channel change */ 642 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 643 SCAN_PRIVATE(ss)->ss_duration = duration; 644 ss->ss_maxdwell = duration; 645 ic->ic_flags |= IEEE80211_F_SCAN; 646 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN; 647 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 648 } else { 649 /* XXX msg+stat */ 650 } 651 } else { 652 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 653 "%s: %s scan already in progress\n", __func__, 654 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 655 } 656 657 /* NB: racey, does it matter? */ 658 return (ic->ic_flags & IEEE80211_F_SCAN); 659 } 660 661 /* 662 * Cancel any scan currently going on for the specified vap. 663 */ 664 void 665 ieee80211_cancel_scan(struct ieee80211vap *vap) 666 { 667 struct ieee80211com *ic = vap->iv_ic; 668 struct ieee80211_scan_state *ss = ic->ic_scan; 669 670 if ((ic->ic_flags & IEEE80211_F_SCAN) && 671 ss->ss_vap == vap && 672 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 673 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 674 "%s: cancel %s scan\n", __func__, 675 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 676 "active" : "passive"); 677 678 /* clear bg scan NOPICK and mark cancel request */ 679 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 680 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 681 /* wake up the scan task */ 682 scan_signal(ss); 683 } 684 } 685 686 /* 687 * Cancel any scan currently going on. 688 */ 689 void 690 ieee80211_cancel_anyscan(struct ieee80211vap *vap) 691 { 692 struct ieee80211com *ic = vap->iv_ic; 693 struct ieee80211_scan_state *ss = ic->ic_scan; 694 695 if ((ic->ic_flags & IEEE80211_F_SCAN) && 696 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 697 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 698 "%s: cancel %s scan\n", __func__, 699 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 700 "active" : "passive"); 701 702 /* clear bg scan NOPICK and mark cancel request */ 703 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 704 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 705 /* wake up the scan task */ 706 scan_signal(ss); 707 } 708 } 709 710 /* 711 * Public access to scan_next for drivers that manage 712 * scanning themselves (e.g. for firmware-based devices). 713 */ 714 void 715 ieee80211_scan_next(struct ieee80211vap *vap) 716 { 717 struct ieee80211com *ic = vap->iv_ic; 718 struct ieee80211_scan_state *ss = ic->ic_scan; 719 720 /* wake up the scan task */ 721 scan_signal(ss); 722 } 723 724 /* 725 * Public access to scan_next for drivers that are not able to scan single 726 * channels (e.g. for firmware-based devices). 727 */ 728 void 729 ieee80211_scan_done(struct ieee80211vap *vap) 730 { 731 struct ieee80211com *ic = vap->iv_ic; 732 struct ieee80211_scan_state *ss; 733 734 ss = ic->ic_scan; 735 ss->ss_next = ss->ss_last; /* all channels are complete */ 736 scan_signal(ss); 737 } 738 739 /* 740 * Probe the curent channel, if allowed, while scanning. 741 * If the channel is not marked passive-only then send 742 * a probe request immediately. Otherwise mark state and 743 * listen for beacons on the channel; if we receive something 744 * then we'll transmit a probe request. 745 */ 746 void 747 ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 748 { 749 struct ieee80211com *ic = vap->iv_ic; 750 struct ieee80211_scan_state *ss = ic->ic_scan; 751 struct ifnet *ifp = vap->iv_ifp; 752 int i; 753 754 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 755 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 756 return; 757 } 758 /* 759 * Send directed probe requests followed by any 760 * broadcast probe request. 761 * XXX remove dependence on ic/vap->iv_bss 762 */ 763 for (i = 0; i < ss->ss_nssid; i++) 764 ieee80211_send_probereq(vap->iv_bss, 765 vap->iv_myaddr, ifp->if_broadcastaddr, 766 ifp->if_broadcastaddr, 767 ss->ss_ssid[i].ssid, ss->ss_ssid[i].len); 768 if ((ss->ss_flags & IEEE80211_SCAN_NOBCAST) == 0) 769 ieee80211_send_probereq(vap->iv_bss, 770 vap->iv_myaddr, ifp->if_broadcastaddr, 771 ifp->if_broadcastaddr, 772 "", 0); 773 } 774 775 /* 776 * Scan curchan. If this is an active scan and the channel 777 * is not marked passive then send probe request frame(s). 778 * Arrange for the channel change after maxdwell ticks. 779 */ 780 static void 781 scan_curchan(struct ieee80211_scan_state *ss, unsigned long maxdwell) 782 { 783 struct ieee80211vap *vap = ss->ss_vap; 784 785 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 786 ieee80211_probe_curchan(vap, 0); 787 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 788 maxdwell, scan_signal_callout, ss); 789 } 790 791 static void 792 scan_signal_callout(void *arg) 793 { 794 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 795 796 wlan_serialize_enter(); 797 scan_signal(ss); 798 wlan_serialize_exit(); 799 } 800 801 static void 802 scan_signal(struct ieee80211_scan_state *ss) 803 { 804 wlan_cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv, 0); 805 } 806 807 /* 808 * Handle mindwell requirements completed; initiate a channel 809 * change to the next channel asap. 810 */ 811 static void 812 scan_mindwell(struct ieee80211_scan_state *ss) 813 { 814 struct ieee80211com *ic = ss->ss_ic; 815 816 ic = ss->ss_ic; 817 scan_signal(ss); 818 } 819 820 static void 821 scan_task(void *arg, int pending) 822 { 823 #define ISCAN_REP (ISCAN_MINDWELL | ISCAN_DISCARD) 824 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 825 struct ieee80211vap *vap; 826 struct ieee80211com *ic; 827 struct ieee80211_channel *chan; 828 unsigned long maxdwell, scanend; 829 int scandone = 0; 830 831 wlan_serialize_enter(); 832 vap = ss->ss_vap; 833 ic = ss->ss_ic; 834 835 if (vap == NULL || (ic->ic_flags & IEEE80211_F_SCAN) == 0 || 836 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)) { 837 /* Cancelled before we started */ 838 goto done; 839 } 840 841 if (ss->ss_next == ss->ss_last) { 842 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 843 "%s: no channels to scan\n", __func__); 844 goto done; 845 } 846 847 if (vap->iv_opmode == IEEE80211_M_STA && 848 vap->iv_state == IEEE80211_S_RUN) { 849 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) { 850 /* Enable station power save mode */ 851 ieee80211_sta_pwrsave(vap, 1); 852 /* 853 * Use an 1ms delay so the null data frame has a chance 854 * to go out. Minimum one tick. 855 * XXX Should use M_TXCB mechanism to eliminate this. 856 */ 857 wlan_cv_timedwait(&SCAN_PRIVATE(ss)->ss_scan_cv, 858 hz / 1000 + 1); 859 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 860 goto done; 861 } 862 } 863 864 scanend = ticks + SCAN_PRIVATE(ss)->ss_duration; 865 ic->ic_scan_start(ic); /* notify driver */ 866 867 for (;;) { 868 scandone = (ss->ss_next >= ss->ss_last) || 869 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0; 870 if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) || 871 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) || 872 time_after(ticks + ss->ss_mindwell, scanend)) 873 break; 874 875 chan = ss->ss_chans[ss->ss_next++]; 876 877 /* 878 * Watch for truncation due to the scan end time. 879 */ 880 if (time_after(ticks + ss->ss_maxdwell, scanend)) 881 maxdwell = scanend - ticks; 882 else 883 maxdwell = ss->ss_maxdwell; 884 885 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 886 "%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n", 887 __func__, 888 ieee80211_chan2ieee(ic, ic->ic_curchan), 889 channel_type(ic->ic_curchan), 890 ieee80211_chan2ieee(ic, chan), channel_type(chan), 891 (ss->ss_flags & IEEE80211_SCAN_ACTIVE) && 892 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ? 893 "active" : "passive", 894 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell)); 895 896 /* 897 * Potentially change channel and phy mode. 898 */ 899 ic->ic_curchan = chan; 900 ic->ic_rt = ieee80211_get_ratetable(chan); 901 /* 902 * Perform the channel change and scan unlocked so the driver 903 * may sleep. Once set_channel returns the hardware has 904 * completed the channel change. 905 */ 906 ic->ic_set_channel(ic); 907 ieee80211_radiotap_chan_change(ic); 908 909 /* 910 * Scan curchan. Drivers for "intelligent hardware" 911 * override ic_scan_curchan to tell the device to do 912 * the work. Otherwise we manage the work outselves; 913 * sending a probe request (as needed), and arming the 914 * timeout to switch channels after maxdwell ticks. 915 * 916 * scan_curchan should only pause for the time required to 917 * prepare/initiate the hardware for the scan (if at all), the 918 * below condvar is used to sleep for the channels dwell time 919 * and allows it to be signalled for abort. 920 */ 921 ic->ic_scan_curchan(ss, maxdwell); 922 923 SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell; 924 /* clear mindwell lock and initial channel change flush */ 925 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 926 927 if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT))) 928 continue; 929 930 /* Wait to be signalled to scan the next channel */ 931 wlan_cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv); 932 } 933 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 934 goto done; 935 936 ic->ic_scan_end(ic); /* notify driver */ 937 938 /* 939 * Record scan complete time. Note that we also do 940 * this when canceled so any background scan will 941 * not be restarted for a while. 942 */ 943 if (scandone) 944 ic->ic_lastscan = ticks; 945 /* return to the bss channel */ 946 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 947 ic->ic_curchan != ic->ic_bsschan) { 948 ieee80211_setupcurchan(ic, ic->ic_bsschan); 949 ic->ic_set_channel(ic); 950 ieee80211_radiotap_chan_change(ic); 951 } 952 /* clear internal flags and any indication of a pick */ 953 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 954 ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK; 955 956 /* 957 * If not canceled and scan completed, do post-processing. 958 * If the callback function returns 0, then it wants to 959 * continue/restart scanning. Unfortunately we needed to 960 * notify the driver to end the scan above to avoid having 961 * rx frames alter the scan candidate list. 962 */ 963 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 && 964 !ss->ss_ops->scan_end(ss, vap) && 965 (ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 && 966 time_before(ticks + ss->ss_mindwell, scanend)) { 967 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 968 "%s: done, restart " 969 "[ticks %u, dwell min %lu scanend %lu]\n", 970 __func__, 971 ticks, ss->ss_mindwell, scanend); 972 ss->ss_next = 0; /* reset to begining */ 973 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 974 vap->iv_stats.is_scan_active++; 975 else 976 vap->iv_stats.is_scan_passive++; 977 978 ss->ss_ops->scan_restart(ss, vap); /* XXX? */ 979 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 980 goto done2; 981 } 982 983 /* past here, scandone is ``true'' if not in bg mode */ 984 if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0) 985 scandone = 1; 986 987 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 988 "%s: %s, [ticks %u, dwell min %lu scanend %lu]\n", 989 __func__, scandone ? "done" : "stopped", 990 ticks, ss->ss_mindwell, scanend); 991 992 /* 993 * Clear the SCAN bit first in case frames are 994 * pending on the station power save queue. If 995 * we defer this then the dispatch of the frames 996 * may generate a request to cancel scanning. 997 */ 998 done: 999 ic->ic_flags &= ~IEEE80211_F_SCAN; 1000 /* 1001 * Drop out of power save mode when a scan has 1002 * completed. If this scan was prematurely terminated 1003 * because it is a background scan then don't notify 1004 * the ap; we'll either return to scanning after we 1005 * receive the beacon frame or we'll drop out of power 1006 * save mode because the beacon indicates we have frames 1007 * waiting for us. 1008 */ 1009 if (scandone) { 1010 ieee80211_sta_pwrsave(vap, 0); 1011 if (ss->ss_next >= ss->ss_last) { 1012 ieee80211_notify_scan_done(vap); 1013 ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN; 1014 } 1015 } 1016 SCAN_PRIVATE(ss)->ss_iflags &= ~(ISCAN_CANCEL|ISCAN_ABORT); 1017 ss->ss_flags &= ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST); 1018 done2: 1019 wlan_serialize_exit(); 1020 #undef ISCAN_REP 1021 } 1022 1023 #ifdef IEEE80211_DEBUG 1024 static void 1025 dump_country(const uint8_t *ie) 1026 { 1027 const struct ieee80211_country_ie *cie = 1028 (const struct ieee80211_country_ie *) ie; 1029 int i, nbands, schan, nchan; 1030 1031 if (cie->len < 3) { 1032 kprintf(" <bogus country ie, len %d>", cie->len); 1033 return; 1034 } 1035 kprintf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 1036 nbands = (cie->len - 3) / sizeof(cie->band[0]); 1037 for (i = 0; i < nbands; i++) { 1038 schan = cie->band[i].schan; 1039 nchan = cie->band[i].nchan; 1040 if (nchan != 1) 1041 kprintf(" %u-%u,%u", schan, schan + nchan-1, 1042 cie->band[i].maxtxpwr); 1043 else 1044 kprintf(" %u,%u", schan, cie->band[i].maxtxpwr); 1045 } 1046 kprintf("]"); 1047 } 1048 1049 static void 1050 dump_probe_beacon(uint8_t subtype, int isnew, 1051 const uint8_t mac[IEEE80211_ADDR_LEN], 1052 const struct ieee80211_scanparams *sp, int rssi) 1053 { 1054 1055 kprintf("[%6D] %s%s on chan %u (bss chan %u) ", 1056 mac, ":", isnew ? "new " : "", 1057 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], 1058 sp->chan, sp->bchan); 1059 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 1060 kprintf(" rssi %d\n", rssi); 1061 1062 if (isnew) { 1063 kprintf("[%6D] caps 0x%x bintval %u erp 0x%x", 1064 mac, ":", sp->capinfo, sp->bintval, sp->erp); 1065 if (sp->country != NULL) 1066 dump_country(sp->country); 1067 kprintf("\n"); 1068 } 1069 } 1070 #endif /* IEEE80211_DEBUG */ 1071 1072 /* 1073 * Process a beacon or probe response frame. 1074 */ 1075 void 1076 ieee80211_add_scan(struct ieee80211vap *vap, 1077 const struct ieee80211_scanparams *sp, 1078 const struct ieee80211_frame *wh, 1079 int subtype, int rssi, int noise) 1080 { 1081 struct ieee80211com *ic = vap->iv_ic; 1082 struct ieee80211_scan_state *ss = ic->ic_scan; 1083 1084 /* XXX locking */ 1085 /* 1086 * Frames received during startup are discarded to avoid 1087 * using scan state setup on the initial entry to the timer 1088 * callback. This can occur because the device may enable 1089 * rx prior to our doing the initial channel change in the 1090 * timer routine. 1091 */ 1092 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD) 1093 return; 1094 #ifdef IEEE80211_DEBUG 1095 if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN)) 1096 dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi); 1097 #endif 1098 if (ss->ss_ops != NULL && 1099 ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise)) { 1100 /* 1101 * If we've reached the min dwell time terminate 1102 * the timer so we'll switch to the next channel. 1103 */ 1104 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 && 1105 time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) { 1106 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1107 "%s: chan %3d%c min dwell met (%u > %lu)\n", 1108 __func__, 1109 ieee80211_chan2ieee(ic, ic->ic_curchan), 1110 channel_type(ic->ic_curchan), 1111 ticks, SCAN_PRIVATE(ss)->ss_chanmindwell); 1112 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL; 1113 /* 1114 * NB: trigger at next clock tick or wait for the 1115 * hardware. 1116 */ 1117 ic->ic_scan_mindwell(ss); 1118 } 1119 } 1120 } 1121 1122 /* 1123 * Timeout/age scan cache entries; called from sta timeout 1124 * timer (XXX should be self-contained). 1125 */ 1126 void 1127 ieee80211_scan_timeout(struct ieee80211com *ic) 1128 { 1129 struct ieee80211_scan_state *ss = ic->ic_scan; 1130 1131 if (ss->ss_ops != NULL) 1132 ss->ss_ops->scan_age(ss); 1133 } 1134 1135 /* 1136 * Mark a scan cache entry after a successful associate. 1137 */ 1138 void 1139 ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 1140 { 1141 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1142 1143 if (ss->ss_ops != NULL) { 1144 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 1145 mac, "%s", __func__); 1146 ss->ss_ops->scan_assoc_success(ss, mac); 1147 } 1148 } 1149 1150 /* 1151 * Demerit a scan cache entry after failing to associate. 1152 */ 1153 void 1154 ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 1155 const uint8_t mac[], int reason) 1156 { 1157 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1158 1159 if (ss->ss_ops != NULL) { 1160 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 1161 "%s: reason %u", __func__, reason); 1162 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 1163 } 1164 } 1165 1166 /* 1167 * Iterate over the contents of the scan cache. 1168 */ 1169 void 1170 ieee80211_scan_iterate(struct ieee80211vap *vap, 1171 ieee80211_scan_iter_func *f, void *arg) 1172 { 1173 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1174 1175 if (ss->ss_ops != NULL) 1176 ss->ss_ops->scan_iterate(ss, f, arg); 1177 } 1178 1179 /* 1180 * Flush the contents of the scan cache. 1181 */ 1182 void 1183 ieee80211_scan_flush(struct ieee80211vap *vap) 1184 { 1185 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1186 1187 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 1188 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 1189 ss->ss_ops->scan_flush(ss); 1190 } 1191 } 1192 1193 /* 1194 * Check the scan cache for an ap/channel to use; if that 1195 * fails then kick off a new scan. 1196 */ 1197 struct ieee80211_channel * 1198 ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 1199 { 1200 struct ieee80211_scan_state *ss = ic->ic_scan; 1201 1202 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 1203 /* XXX printf? */ 1204 return NULL; 1205 } 1206 if (ss->ss_ops->scan_pickchan == NULL) { 1207 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 1208 "%s: scan module does not support picking a channel, " 1209 "opmode %d\n", __func__, ss->ss_vap->iv_opmode); 1210 return NULL; 1211 } 1212 return ss->ss_ops->scan_pickchan(ss, flags); 1213 } 1214