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_var.h> 44 #include <net/if_media.h> 45 #include <net/ethernet.h> 46 47 #include <net80211/ieee80211_var.h> 48 49 #include <net/bpf.h> 50 51 struct scan_state { 52 struct ieee80211_scan_state base; /* public state */ 53 54 u_int ss_iflags; /* flags used internally */ 55 #define ISCAN_MINDWELL 0x0001 /* min dwell time reached */ 56 #define ISCAN_DISCARD 0x0002 /* discard rx'd frames */ 57 #define ISCAN_CANCEL 0x0004 /* cancel current scan */ 58 #define ISCAN_ABORT 0x0008 /* end the scan immediately */ 59 unsigned long ss_chanmindwell; /* min dwell on curchan */ 60 unsigned long ss_scanend; /* time scan must stop */ 61 u_int ss_duration; /* duration for next scan */ 62 struct task ss_scan_task; /* scan execution */ 63 struct cv ss_scan_cv; /* scan signal */ 64 struct callout ss_scan_timer; /* scan timer */ 65 }; 66 #define SCAN_PRIVATE(ss) ((struct scan_state *) ss) 67 68 /* 69 * Amount of time to go off-channel during a background 70 * scan. This value should be large enough to catch most 71 * ap's but short enough that we can return on-channel 72 * before our listen interval expires. 73 * 74 * XXX tunable 75 * XXX check against configured listen interval 76 */ 77 #define IEEE80211_SCAN_OFFCHANNEL msecs_to_ticks(150) 78 79 /* 80 * Roaming-related defaults. RSSI thresholds are as returned by the 81 * driver (.5dBm). Transmit rate thresholds are IEEE rate codes (i.e 82 * .5M units) or MCS. 83 */ 84 /* rssi thresholds */ 85 #define ROAM_RSSI_11A_DEFAULT 14 /* 11a bss */ 86 #define ROAM_RSSI_11B_DEFAULT 14 /* 11b bss */ 87 #define ROAM_RSSI_11BONLY_DEFAULT 14 /* 11b-only bss */ 88 /* transmit rate thresholds */ 89 #define ROAM_RATE_11A_DEFAULT 2*12 /* 11a bss */ 90 #define ROAM_RATE_11B_DEFAULT 2*5 /* 11b bss */ 91 #define ROAM_RATE_11BONLY_DEFAULT 2*1 /* 11b-only bss */ 92 #define ROAM_RATE_HALF_DEFAULT 2*6 /* half-width 11a/g bss */ 93 #define ROAM_RATE_QUARTER_DEFAULT 2*3 /* quarter-width 11a/g bss */ 94 #define ROAM_MCS_11N_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11n bss */ 95 96 static void scan_curchan(struct ieee80211_scan_state *, unsigned long); 97 static void scan_mindwell(struct ieee80211_scan_state *); 98 static void scan_signal(void *); 99 static void scan_task(void *, int); 100 101 MALLOC_DEFINE(M_80211_SCAN, "80211scan", "802.11 scan state"); 102 103 void 104 ieee80211_scan_attach(struct ieee80211com *ic) 105 { 106 struct scan_state *ss; 107 108 ss = (struct scan_state *) malloc(sizeof(struct scan_state), 109 M_80211_SCAN, M_NOWAIT | M_ZERO); 110 if (ss == NULL) { 111 ic->ic_scan = NULL; 112 return; 113 } 114 callout_init_mtx(&ss->ss_scan_timer, IEEE80211_LOCK_OBJ(ic), 0); 115 cv_init(&ss->ss_scan_cv, "scan"); 116 TASK_INIT(&ss->ss_scan_task, 0, scan_task, ss); 117 ic->ic_scan = &ss->base; 118 ss->base.ss_ic = ic; 119 120 ic->ic_scan_curchan = scan_curchan; 121 ic->ic_scan_mindwell = scan_mindwell; 122 } 123 124 void 125 ieee80211_scan_detach(struct ieee80211com *ic) 126 { 127 struct ieee80211_scan_state *ss = ic->ic_scan; 128 129 if (ss != NULL) { 130 IEEE80211_LOCK(ic); 131 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT; 132 scan_signal(ss); 133 IEEE80211_UNLOCK(ic); 134 ieee80211_draintask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 135 callout_drain(&SCAN_PRIVATE(ss)->ss_scan_timer); 136 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, 137 ("scan still running")); 138 if (ss->ss_ops != NULL) { 139 ss->ss_ops->scan_detach(ss); 140 ss->ss_ops = NULL; 141 } 142 ic->ic_scan = NULL; 143 free(SCAN_PRIVATE(ss), M_80211_SCAN); 144 } 145 } 146 147 static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = { 148 [IEEE80211_MODE_11A] = { .rssi = ROAM_RSSI_11A_DEFAULT, 149 .rate = ROAM_RATE_11A_DEFAULT }, 150 [IEEE80211_MODE_11G] = { .rssi = ROAM_RSSI_11B_DEFAULT, 151 .rate = ROAM_RATE_11B_DEFAULT }, 152 [IEEE80211_MODE_11B] = { .rssi = ROAM_RSSI_11BONLY_DEFAULT, 153 .rate = ROAM_RATE_11BONLY_DEFAULT }, 154 [IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT, 155 .rate = ROAM_RATE_11A_DEFAULT }, 156 [IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT, 157 .rate = ROAM_RATE_11A_DEFAULT }, 158 [IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT, 159 .rate = ROAM_RATE_11A_DEFAULT }, 160 [IEEE80211_MODE_HALF] = { .rssi = ROAM_RSSI_11A_DEFAULT, 161 .rate = ROAM_RATE_HALF_DEFAULT }, 162 [IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT, 163 .rate = ROAM_RATE_QUARTER_DEFAULT }, 164 [IEEE80211_MODE_11NA] = { .rssi = ROAM_RSSI_11A_DEFAULT, 165 .rate = ROAM_MCS_11N_DEFAULT }, 166 [IEEE80211_MODE_11NG] = { .rssi = ROAM_RSSI_11B_DEFAULT, 167 .rate = ROAM_MCS_11N_DEFAULT }, 168 }; 169 170 void 171 ieee80211_scan_vattach(struct ieee80211vap *vap) 172 { 173 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz; 174 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz; 175 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz; 176 177 vap->iv_roaming = IEEE80211_ROAMING_AUTO; 178 memcpy(vap->iv_roamparms, defroam, sizeof(defroam)); 179 } 180 181 void 182 ieee80211_scan_vdetach(struct ieee80211vap *vap) 183 { 184 struct ieee80211com *ic = vap->iv_ic; 185 struct ieee80211_scan_state *ss; 186 187 IEEE80211_LOCK(ic); 188 ss = ic->ic_scan; 189 if (ss != NULL && ss->ss_vap == vap) { 190 if (ic->ic_flags & IEEE80211_F_SCAN) { 191 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT; 192 scan_signal(ss); 193 } 194 if (ss->ss_ops != NULL) { 195 ss->ss_ops->scan_detach(ss); 196 ss->ss_ops = NULL; 197 } 198 ss->ss_vap = NULL; 199 } 200 IEEE80211_UNLOCK(ic); 201 } 202 203 /* 204 * Simple-minded scanner module support. 205 */ 206 static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 207 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 208 "wlan_scan_sta", /* IEEE80211_M_STA */ 209 "wlan_scan_wds", /* IEEE80211_M_WDS */ 210 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 211 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 212 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 213 "wlan_scan_sta", /* IEEE80211_M_MBSS */ 214 }; 215 static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 216 217 const struct ieee80211_scanner * 218 ieee80211_scanner_get(enum ieee80211_opmode mode) 219 { 220 if (mode >= IEEE80211_OPMODE_MAX) 221 return NULL; 222 if (scanners[mode] == NULL) 223 ieee80211_load_module(scan_modnames[mode]); 224 return scanners[mode]; 225 } 226 227 void 228 ieee80211_scanner_register(enum ieee80211_opmode mode, 229 const struct ieee80211_scanner *scan) 230 { 231 if (mode >= IEEE80211_OPMODE_MAX) 232 return; 233 scanners[mode] = scan; 234 } 235 236 void 237 ieee80211_scanner_unregister(enum ieee80211_opmode mode, 238 const struct ieee80211_scanner *scan) 239 { 240 if (mode >= IEEE80211_OPMODE_MAX) 241 return; 242 if (scanners[mode] == scan) 243 scanners[mode] = NULL; 244 } 245 246 void 247 ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 248 { 249 int m; 250 251 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 252 if (scanners[m] == scan) 253 scanners[m] = NULL; 254 } 255 256 /* 257 * Update common scanner state to reflect the current 258 * operating mode. This is called when the state machine 259 * is transitioned to RUN state w/o scanning--e.g. when 260 * operating in monitor mode. The purpose of this is to 261 * ensure later callbacks find ss_ops set to properly 262 * reflect current operating mode. 263 */ 264 static void 265 scan_update_locked(struct ieee80211vap *vap, 266 const struct ieee80211_scanner *scan) 267 { 268 struct ieee80211com *ic = vap->iv_ic; 269 struct ieee80211_scan_state *ss = ic->ic_scan; 270 271 IEEE80211_LOCK_ASSERT(ic); 272 273 #ifdef IEEE80211_DEBUG 274 if (ss->ss_vap != vap || ss->ss_ops != scan) { 275 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 276 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 277 __func__, 278 ss->ss_vap != NULL ? 279 ss->ss_vap->iv_ifp->if_xname : "none", 280 ss->ss_vap != NULL ? 281 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 282 vap->iv_ifp->if_xname, 283 ieee80211_opmode_name[vap->iv_opmode]); 284 } 285 #endif 286 ss->ss_vap = vap; 287 if (ss->ss_ops != scan) { 288 /* 289 * Switch scanners; detach old, attach new. Special 290 * case where a single scan module implements multiple 291 * policies by using different scan ops but a common 292 * core. We assume if the old and new attach methods 293 * are identical then it's ok to just change ss_ops 294 * and not flush the internal state of the module. 295 */ 296 if (scan == NULL || ss->ss_ops == NULL || 297 ss->ss_ops->scan_attach != scan->scan_attach) { 298 if (ss->ss_ops != NULL) 299 ss->ss_ops->scan_detach(ss); 300 if (scan != NULL && !scan->scan_attach(ss)) { 301 /* XXX attach failure */ 302 /* XXX stat+msg */ 303 scan = NULL; 304 } 305 } 306 ss->ss_ops = scan; 307 } 308 } 309 310 static char 311 channel_type(const struct ieee80211_channel *c) 312 { 313 if (IEEE80211_IS_CHAN_ST(c)) 314 return 'S'; 315 if (IEEE80211_IS_CHAN_108A(c)) 316 return 'T'; 317 if (IEEE80211_IS_CHAN_108G(c)) 318 return 'G'; 319 if (IEEE80211_IS_CHAN_HT(c)) 320 return 'n'; 321 if (IEEE80211_IS_CHAN_A(c)) 322 return 'a'; 323 if (IEEE80211_IS_CHAN_ANYG(c)) 324 return 'g'; 325 if (IEEE80211_IS_CHAN_B(c)) 326 return 'b'; 327 return 'f'; 328 } 329 330 void 331 ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 332 { 333 struct ieee80211com *ic = ss->ss_ic; 334 const char *sep; 335 int i; 336 337 sep = ""; 338 for (i = ss->ss_next; i < ss->ss_last; i++) { 339 const struct ieee80211_channel *c = ss->ss_chans[i]; 340 341 printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 342 channel_type(c)); 343 sep = ", "; 344 } 345 } 346 347 #ifdef IEEE80211_DEBUG 348 static void 349 scan_dump(struct ieee80211_scan_state *ss) 350 { 351 struct ieee80211vap *vap = ss->ss_vap; 352 353 if_printf(vap->iv_ifp, "scan set "); 354 ieee80211_scan_dump_channels(ss); 355 printf(" dwell min %lums max %lums\n", 356 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 357 } 358 #endif /* IEEE80211_DEBUG */ 359 360 static void 361 copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 362 int nssid, const struct ieee80211_scan_ssid ssids[]) 363 { 364 if (nssid > IEEE80211_SCAN_MAX_SSID) { 365 /* XXX printf */ 366 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 367 "%s: too many ssid %d, ignoring all of them\n", 368 __func__, nssid); 369 return; 370 } 371 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 372 ss->ss_nssid = nssid; 373 } 374 375 /* 376 * Start a scan unless one is already going. 377 */ 378 static int 379 start_scan_locked(const struct ieee80211_scanner *scan, 380 struct ieee80211vap *vap, int flags, u_int duration, 381 u_int mindwell, u_int maxdwell, 382 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 383 { 384 struct ieee80211com *ic = vap->iv_ic; 385 struct ieee80211_scan_state *ss = ic->ic_scan; 386 387 IEEE80211_LOCK_ASSERT(ic); 388 389 if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 390 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 391 "%s: scan inhibited by pending channel change\n", __func__); 392 } else if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 393 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 394 "%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n" 395 , __func__ 396 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 397 , duration, mindwell, maxdwell 398 , ieee80211_phymode_name[vap->iv_des_mode] 399 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 400 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 401 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 402 , flags & IEEE80211_SCAN_NOBCAST ? ", nobcast" : "" 403 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 404 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 405 ); 406 407 scan_update_locked(vap, scan); 408 if (ss->ss_ops != NULL) { 409 if ((flags & IEEE80211_SCAN_NOSSID) == 0) 410 copy_ssid(vap, ss, nssid, ssids); 411 412 /* NB: top 4 bits for internal use */ 413 ss->ss_flags = flags & 0xfff; 414 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 415 vap->iv_stats.is_scan_active++; 416 else 417 vap->iv_stats.is_scan_passive++; 418 if (flags & IEEE80211_SCAN_FLUSH) 419 ss->ss_ops->scan_flush(ss); 420 if (flags & IEEE80211_SCAN_BGSCAN) 421 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN; 422 423 /* NB: flush frames rx'd before 1st channel change */ 424 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 425 SCAN_PRIVATE(ss)->ss_duration = duration; 426 ss->ss_next = 0; 427 ss->ss_mindwell = mindwell; 428 ss->ss_maxdwell = maxdwell; 429 /* NB: scan_start must be before the scan runtask */ 430 ss->ss_ops->scan_start(ss, vap); 431 #ifdef IEEE80211_DEBUG 432 if (ieee80211_msg_scan(vap)) 433 scan_dump(ss); 434 #endif /* IEEE80211_DEBUG */ 435 ic->ic_flags |= IEEE80211_F_SCAN; 436 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 437 } 438 return 1; 439 } else { 440 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 441 "%s: %s scan already in progress\n", __func__, 442 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 443 } 444 return 0; 445 } 446 447 /* 448 * Start a scan unless one is already going. 449 */ 450 int 451 ieee80211_start_scan(struct ieee80211vap *vap, int flags, 452 u_int duration, u_int mindwell, u_int maxdwell, 453 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 454 { 455 struct ieee80211com *ic = vap->iv_ic; 456 const struct ieee80211_scanner *scan; 457 int result; 458 459 scan = ieee80211_scanner_get(vap->iv_opmode); 460 if (scan == NULL) { 461 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 462 "%s: no scanner support for %s mode\n", 463 __func__, ieee80211_opmode_name[vap->iv_opmode]); 464 /* XXX stat */ 465 return 0; 466 } 467 468 IEEE80211_LOCK(ic); 469 result = start_scan_locked(scan, vap, flags, duration, 470 mindwell, maxdwell, nssid, ssids); 471 IEEE80211_UNLOCK(ic); 472 473 return result; 474 } 475 476 /* 477 * Check the scan cache for an ap/channel to use; if that 478 * fails then kick off a new scan. 479 */ 480 int 481 ieee80211_check_scan(struct ieee80211vap *vap, int flags, 482 u_int duration, u_int mindwell, u_int maxdwell, 483 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 484 { 485 struct ieee80211com *ic = vap->iv_ic; 486 struct ieee80211_scan_state *ss = ic->ic_scan; 487 const struct ieee80211_scanner *scan; 488 int result; 489 490 scan = ieee80211_scanner_get(vap->iv_opmode); 491 if (scan == NULL) { 492 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 493 "%s: no scanner support for %s mode\n", 494 __func__, vap->iv_opmode); 495 /* XXX stat */ 496 return 0; 497 } 498 499 /* 500 * Check if there's a list of scan candidates already. 501 * XXX want more than the ap we're currently associated with 502 */ 503 504 IEEE80211_LOCK(ic); 505 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 506 "%s: %s scan, %s%s%s%s%s\n" 507 , __func__ 508 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 509 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 510 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 511 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 512 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 513 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 514 ); 515 516 if (ss->ss_ops != scan) { 517 /* XXX re-use cache contents? e.g. adhoc<->sta */ 518 flags |= IEEE80211_SCAN_FLUSH; 519 } 520 scan_update_locked(vap, scan); 521 if (ss->ss_ops != NULL) { 522 /* XXX verify ss_ops matches vap->iv_opmode */ 523 if ((flags & IEEE80211_SCAN_NOSSID) == 0) { 524 /* 525 * Update the ssid list and mark flags so if 526 * we call start_scan it doesn't duplicate work. 527 */ 528 copy_ssid(vap, ss, nssid, ssids); 529 flags |= IEEE80211_SCAN_NOSSID; 530 } 531 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 532 (flags & IEEE80211_SCAN_FLUSH) == 0 && 533 time_before(ticks, ic->ic_lastscan + vap->iv_scanvalid)) { 534 /* 535 * We're not currently scanning and the cache is 536 * deemed hot enough to consult. Lock out others 537 * by marking IEEE80211_F_SCAN while we decide if 538 * something is already in the scan cache we can 539 * use. Also discard any frames that might come 540 * in while temporarily marked as scanning. 541 */ 542 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 543 ic->ic_flags |= IEEE80211_F_SCAN; 544 545 /* NB: need to use supplied flags in check */ 546 ss->ss_flags = flags & 0xff; 547 result = ss->ss_ops->scan_end(ss, vap); 548 549 ic->ic_flags &= ~IEEE80211_F_SCAN; 550 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD; 551 if (result) { 552 ieee80211_notify_scan_done(vap); 553 IEEE80211_UNLOCK(ic); 554 return 1; 555 } 556 } 557 } 558 result = start_scan_locked(scan, vap, flags, duration, 559 mindwell, maxdwell, nssid, ssids); 560 IEEE80211_UNLOCK(ic); 561 562 return result; 563 } 564 565 /* 566 * Check the scan cache for an ap/channel to use; if that fails 567 * then kick off a scan using the current settings. 568 */ 569 int 570 ieee80211_check_scan_current(struct ieee80211vap *vap) 571 { 572 return ieee80211_check_scan(vap, 573 IEEE80211_SCAN_ACTIVE, 574 IEEE80211_SCAN_FOREVER, 0, 0, 575 vap->iv_des_nssid, vap->iv_des_ssid); 576 } 577 578 /* 579 * Restart a previous scan. If the previous scan completed 580 * then we start again using the existing channel list. 581 */ 582 int 583 ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 584 { 585 struct ieee80211com *ic = vap->iv_ic; 586 struct ieee80211_scan_state *ss = ic->ic_scan; 587 const struct ieee80211_scanner *scan; 588 589 scan = ieee80211_scanner_get(vap->iv_opmode); 590 if (scan == NULL) { 591 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 592 "%s: no scanner support for %s mode\n", 593 __func__, vap->iv_opmode); 594 /* XXX stat */ 595 return 0; 596 } 597 598 IEEE80211_LOCK(ic); 599 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 600 u_int duration; 601 /* 602 * Go off-channel for a fixed interval that is large 603 * enough to catch most ap's but short enough that 604 * we can return on-channel before our listen interval 605 * expires. 606 */ 607 duration = IEEE80211_SCAN_OFFCHANNEL; 608 609 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 610 "%s: %s scan, ticks %u duration %lu\n", __func__, 611 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive", 612 ticks, duration); 613 614 scan_update_locked(vap, scan); 615 if (ss->ss_ops != NULL) { 616 ss->ss_vap = vap; 617 /* 618 * A background scan does not select a new sta; it 619 * just refreshes the scan cache. Also, indicate 620 * the scan logic should follow the beacon schedule: 621 * we go off-channel and scan for a while, then 622 * return to the bss channel to receive a beacon, 623 * then go off-channel again. All during this time 624 * we notify the ap we're in power save mode. When 625 * the scan is complete we leave power save mode. 626 * If any beacon indicates there are frames pending 627 * for us then we drop out of power save mode 628 * (and background scan) automatically by way of the 629 * usual sta power save logic. 630 */ 631 ss->ss_flags |= IEEE80211_SCAN_NOPICK 632 | IEEE80211_SCAN_BGSCAN 633 | flags 634 ; 635 /* if previous scan completed, restart */ 636 if (ss->ss_next >= ss->ss_last) { 637 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 638 vap->iv_stats.is_scan_active++; 639 else 640 vap->iv_stats.is_scan_passive++; 641 /* 642 * NB: beware of the scan cache being flushed; 643 * if the channel list is empty use the 644 * scan_start method to populate it. 645 */ 646 ss->ss_next = 0; 647 if (ss->ss_last != 0) 648 ss->ss_ops->scan_restart(ss, vap); 649 else { 650 ss->ss_ops->scan_start(ss, vap); 651 #ifdef IEEE80211_DEBUG 652 if (ieee80211_msg_scan(vap)) 653 scan_dump(ss); 654 #endif /* IEEE80211_DEBUG */ 655 } 656 } 657 /* NB: flush frames rx'd before 1st channel change */ 658 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD; 659 SCAN_PRIVATE(ss)->ss_duration = duration; 660 ss->ss_maxdwell = duration; 661 ic->ic_flags |= IEEE80211_F_SCAN; 662 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN; 663 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 664 } else { 665 /* XXX msg+stat */ 666 } 667 } else { 668 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 669 "%s: %s scan already in progress\n", __func__, 670 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"); 671 } 672 IEEE80211_UNLOCK(ic); 673 674 /* NB: racey, does it matter? */ 675 return (ic->ic_flags & IEEE80211_F_SCAN); 676 } 677 678 /* 679 * Cancel any scan currently going on for the specified vap. 680 */ 681 void 682 ieee80211_cancel_scan(struct ieee80211vap *vap) 683 { 684 struct ieee80211com *ic = vap->iv_ic; 685 struct ieee80211_scan_state *ss = ic->ic_scan; 686 687 IEEE80211_LOCK(ic); 688 if ((ic->ic_flags & IEEE80211_F_SCAN) && 689 ss->ss_vap == vap && 690 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 691 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 692 "%s: cancel %s scan\n", __func__, 693 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 694 "active" : "passive"); 695 696 /* clear bg scan NOPICK and mark cancel request */ 697 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 698 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 699 /* wake up the scan task */ 700 scan_signal(ss); 701 } 702 IEEE80211_UNLOCK(ic); 703 } 704 705 /* 706 * Cancel any scan currently going on. 707 */ 708 void 709 ieee80211_cancel_anyscan(struct ieee80211vap *vap) 710 { 711 struct ieee80211com *ic = vap->iv_ic; 712 struct ieee80211_scan_state *ss = ic->ic_scan; 713 714 IEEE80211_LOCK(ic); 715 if ((ic->ic_flags & IEEE80211_F_SCAN) && 716 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) { 717 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 718 "%s: cancel %s scan\n", __func__, 719 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? 720 "active" : "passive"); 721 722 /* clear bg scan NOPICK and mark cancel request */ 723 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK; 724 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL; 725 /* wake up the scan task */ 726 scan_signal(ss); 727 } 728 IEEE80211_UNLOCK(ic); 729 } 730 731 /* 732 * Public access to scan_next for drivers that manage 733 * scanning themselves (e.g. for firmware-based devices). 734 */ 735 void 736 ieee80211_scan_next(struct ieee80211vap *vap) 737 { 738 struct ieee80211com *ic = vap->iv_ic; 739 struct ieee80211_scan_state *ss = ic->ic_scan; 740 741 /* wake up the scan task */ 742 IEEE80211_LOCK(ic); 743 scan_signal(ss); 744 IEEE80211_UNLOCK(ic); 745 } 746 747 /* 748 * Public access to scan_next for drivers that are not able to scan single 749 * channels (e.g. for firmware-based devices). 750 */ 751 void 752 ieee80211_scan_done(struct ieee80211vap *vap) 753 { 754 struct ieee80211com *ic = vap->iv_ic; 755 struct ieee80211_scan_state *ss; 756 757 IEEE80211_LOCK(ic); 758 ss = ic->ic_scan; 759 ss->ss_next = ss->ss_last; /* all channels are complete */ 760 scan_signal(ss); 761 IEEE80211_UNLOCK(ic); 762 } 763 764 /* 765 * Probe the curent channel, if allowed, while scanning. 766 * If the channel is not marked passive-only then send 767 * a probe request immediately. Otherwise mark state and 768 * listen for beacons on the channel; if we receive something 769 * then we'll transmit a probe request. 770 */ 771 void 772 ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 773 { 774 struct ieee80211com *ic = vap->iv_ic; 775 struct ieee80211_scan_state *ss = ic->ic_scan; 776 struct ifnet *ifp = vap->iv_ifp; 777 int i; 778 779 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 780 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 781 return; 782 } 783 /* 784 * Send directed probe requests followed by any 785 * broadcast probe request. 786 * XXX remove dependence on ic/vap->iv_bss 787 */ 788 for (i = 0; i < ss->ss_nssid; i++) 789 ieee80211_send_probereq(vap->iv_bss, 790 vap->iv_myaddr, ifp->if_broadcastaddr, 791 ifp->if_broadcastaddr, 792 ss->ss_ssid[i].ssid, ss->ss_ssid[i].len); 793 if ((ss->ss_flags & IEEE80211_SCAN_NOBCAST) == 0) 794 ieee80211_send_probereq(vap->iv_bss, 795 vap->iv_myaddr, ifp->if_broadcastaddr, 796 ifp->if_broadcastaddr, 797 "", 0); 798 } 799 800 /* 801 * Scan curchan. If this is an active scan and the channel 802 * is not marked passive then send probe request frame(s). 803 * Arrange for the channel change after maxdwell ticks. 804 */ 805 static void 806 scan_curchan(struct ieee80211_scan_state *ss, unsigned long maxdwell) 807 { 808 struct ieee80211vap *vap = ss->ss_vap; 809 810 IEEE80211_LOCK(vap->iv_ic); 811 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 812 ieee80211_probe_curchan(vap, 0); 813 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer, 814 maxdwell, scan_signal, ss); 815 IEEE80211_UNLOCK(vap->iv_ic); 816 } 817 818 static void 819 scan_signal(void *arg) 820 { 821 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 822 823 IEEE80211_LOCK_ASSERT(ss->ss_ic); 824 825 cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv); 826 } 827 828 /* 829 * Handle mindwell requirements completed; initiate a channel 830 * change to the next channel asap. 831 */ 832 static void 833 scan_mindwell(struct ieee80211_scan_state *ss) 834 { 835 struct ieee80211com *ic = ss->ss_ic; 836 837 IEEE80211_LOCK(ic); 838 scan_signal(ss); 839 IEEE80211_UNLOCK(ic); 840 } 841 842 static void 843 scan_task(void *arg, int pending) 844 { 845 #define ISCAN_REP (ISCAN_MINDWELL | ISCAN_DISCARD) 846 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg; 847 struct ieee80211vap *vap = ss->ss_vap; 848 struct ieee80211com *ic = ss->ss_ic; 849 struct ieee80211_channel *chan; 850 unsigned long maxdwell, scanend; 851 int scandone = 0; 852 853 IEEE80211_LOCK(ic); 854 if (vap == NULL || (ic->ic_flags & IEEE80211_F_SCAN) == 0 || 855 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)) { 856 /* Cancelled before we started */ 857 goto done; 858 } 859 860 if (ss->ss_next == ss->ss_last) { 861 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 862 "%s: no channels to scan\n", __func__); 863 scandone = 1; 864 goto done; 865 } 866 867 if (vap->iv_opmode == IEEE80211_M_STA && 868 vap->iv_state == IEEE80211_S_RUN) { 869 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) { 870 /* Enable station power save mode */ 871 vap->iv_sta_ps(vap, 1); 872 /* 873 * Use an 1ms delay so the null data frame has a chance 874 * to go out. 875 * XXX Should use M_TXCB mechanism to eliminate this. 876 */ 877 cv_timedwait(&SCAN_PRIVATE(ss)->ss_scan_cv, 878 IEEE80211_LOCK_OBJ(ic), hz / 1000); 879 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 880 goto done; 881 } 882 } 883 884 scanend = ticks + SCAN_PRIVATE(ss)->ss_duration; 885 IEEE80211_UNLOCK(ic); 886 ic->ic_scan_start(ic); /* notify driver */ 887 IEEE80211_LOCK(ic); 888 889 for (;;) { 890 scandone = (ss->ss_next >= ss->ss_last) || 891 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0; 892 if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) || 893 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) || 894 time_after(ticks + ss->ss_mindwell, scanend)) 895 break; 896 897 chan = ss->ss_chans[ss->ss_next++]; 898 899 /* 900 * Watch for truncation due to the scan end time. 901 */ 902 if (time_after(ticks + ss->ss_maxdwell, scanend)) 903 maxdwell = scanend - ticks; 904 else 905 maxdwell = ss->ss_maxdwell; 906 907 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 908 "%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n", 909 __func__, 910 ieee80211_chan2ieee(ic, ic->ic_curchan), 911 channel_type(ic->ic_curchan), 912 ieee80211_chan2ieee(ic, chan), channel_type(chan), 913 (ss->ss_flags & IEEE80211_SCAN_ACTIVE) && 914 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ? 915 "active" : "passive", 916 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell)); 917 918 /* 919 * Potentially change channel and phy mode. 920 */ 921 ic->ic_curchan = chan; 922 ic->ic_rt = ieee80211_get_ratetable(chan); 923 IEEE80211_UNLOCK(ic); 924 /* 925 * Perform the channel change and scan unlocked so the driver 926 * may sleep. Once set_channel returns the hardware has 927 * completed the channel change. 928 */ 929 ic->ic_set_channel(ic); 930 ieee80211_radiotap_chan_change(ic); 931 932 /* 933 * Scan curchan. Drivers for "intelligent hardware" 934 * override ic_scan_curchan to tell the device to do 935 * the work. Otherwise we manage the work outselves; 936 * sending a probe request (as needed), and arming the 937 * timeout to switch channels after maxdwell ticks. 938 * 939 * scan_curchan should only pause for the time required to 940 * prepare/initiate the hardware for the scan (if at all), the 941 * below condvar is used to sleep for the channels dwell time 942 * and allows it to be signalled for abort. 943 */ 944 ic->ic_scan_curchan(ss, maxdwell); 945 IEEE80211_LOCK(ic); 946 947 SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell; 948 /* clear mindwell lock and initial channel change flush */ 949 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 950 951 if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT))) 952 continue; 953 954 /* Wait to be signalled to scan the next channel */ 955 cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv, IEEE80211_LOCK_OBJ(ic)); 956 } 957 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) 958 goto done; 959 960 IEEE80211_UNLOCK(ic); 961 ic->ic_scan_end(ic); /* notify driver */ 962 IEEE80211_LOCK(ic); 963 964 /* 965 * Since a cancellation may have occured during one of the 966 * driver calls (whilst unlocked), update scandone. 967 */ 968 if (scandone == 0 && 969 ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0)) { 970 /* XXX printf? */ 971 if_printf(vap->iv_ifp, 972 "%s: OOPS! scan cancelled during driver call!\n", 973 __func__); 974 } 975 scandone |= ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0); 976 977 /* 978 * Record scan complete time. Note that we also do 979 * this when canceled so any background scan will 980 * not be restarted for a while. 981 */ 982 if (scandone) 983 ic->ic_lastscan = ticks; 984 /* return to the bss channel */ 985 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 986 ic->ic_curchan != ic->ic_bsschan) { 987 ieee80211_setupcurchan(ic, ic->ic_bsschan); 988 IEEE80211_UNLOCK(ic); 989 ic->ic_set_channel(ic); 990 ieee80211_radiotap_chan_change(ic); 991 IEEE80211_LOCK(ic); 992 } 993 /* clear internal flags and any indication of a pick */ 994 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP; 995 ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK; 996 997 /* 998 * If not canceled and scan completed, do post-processing. 999 * If the callback function returns 0, then it wants to 1000 * continue/restart scanning. Unfortunately we needed to 1001 * notify the driver to end the scan above to avoid having 1002 * rx frames alter the scan candidate list. 1003 */ 1004 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 && 1005 !ss->ss_ops->scan_end(ss, vap) && 1006 (ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 && 1007 time_before(ticks + ss->ss_mindwell, scanend)) { 1008 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1009 "%s: done, restart " 1010 "[ticks %u, dwell min %lu scanend %lu]\n", 1011 __func__, 1012 ticks, ss->ss_mindwell, scanend); 1013 ss->ss_next = 0; /* reset to begining */ 1014 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE) 1015 vap->iv_stats.is_scan_active++; 1016 else 1017 vap->iv_stats.is_scan_passive++; 1018 1019 ss->ss_ops->scan_restart(ss, vap); /* XXX? */ 1020 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task); 1021 IEEE80211_UNLOCK(ic); 1022 return; 1023 } 1024 1025 /* past here, scandone is ``true'' if not in bg mode */ 1026 if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0) 1027 scandone = 1; 1028 1029 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1030 "%s: %s, [ticks %u, dwell min %lu scanend %lu]\n", 1031 __func__, scandone ? "done" : "stopped", 1032 ticks, ss->ss_mindwell, scanend); 1033 1034 /* 1035 * Clear the SCAN bit first in case frames are 1036 * pending on the station power save queue. If 1037 * we defer this then the dispatch of the frames 1038 * may generate a request to cancel scanning. 1039 */ 1040 done: 1041 ic->ic_flags &= ~IEEE80211_F_SCAN; 1042 /* 1043 * Drop out of power save mode when a scan has 1044 * completed. If this scan was prematurely terminated 1045 * because it is a background scan then don't notify 1046 * the ap; we'll either return to scanning after we 1047 * receive the beacon frame or we'll drop out of power 1048 * save mode because the beacon indicates we have frames 1049 * waiting for us. 1050 */ 1051 if (scandone) { 1052 vap->iv_sta_ps(vap, 0); 1053 if (ss->ss_next >= ss->ss_last) { 1054 ieee80211_notify_scan_done(vap); 1055 ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN; 1056 } 1057 } 1058 SCAN_PRIVATE(ss)->ss_iflags &= ~(ISCAN_CANCEL|ISCAN_ABORT); 1059 ss->ss_flags &= ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST); 1060 IEEE80211_UNLOCK(ic); 1061 #undef ISCAN_REP 1062 } 1063 1064 #ifdef IEEE80211_DEBUG 1065 static void 1066 dump_country(const uint8_t *ie) 1067 { 1068 const struct ieee80211_country_ie *cie = 1069 (const struct ieee80211_country_ie *) ie; 1070 int i, nbands, schan, nchan; 1071 1072 if (cie->len < 3) { 1073 printf(" <bogus country ie, len %d>", cie->len); 1074 return; 1075 } 1076 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 1077 nbands = (cie->len - 3) / sizeof(cie->band[0]); 1078 for (i = 0; i < nbands; i++) { 1079 schan = cie->band[i].schan; 1080 nchan = cie->band[i].nchan; 1081 if (nchan != 1) 1082 printf(" %u-%u,%u", schan, schan + nchan-1, 1083 cie->band[i].maxtxpwr); 1084 else 1085 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 1086 } 1087 printf("]"); 1088 } 1089 1090 static void 1091 dump_probe_beacon(uint8_t subtype, int isnew, 1092 const uint8_t mac[IEEE80211_ADDR_LEN], 1093 const struct ieee80211_scanparams *sp, int rssi) 1094 { 1095 1096 printf("[%s] %s%s on chan %u (bss chan %u) ", 1097 ether_sprintf(mac), isnew ? "new " : "", 1098 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], 1099 sp->chan, sp->bchan); 1100 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 1101 printf(" rssi %d\n", rssi); 1102 1103 if (isnew) { 1104 printf("[%s] caps 0x%x bintval %u erp 0x%x", 1105 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 1106 if (sp->country != NULL) 1107 dump_country(sp->country); 1108 printf("\n"); 1109 } 1110 } 1111 #endif /* IEEE80211_DEBUG */ 1112 1113 /* 1114 * Process a beacon or probe response frame. 1115 */ 1116 void 1117 ieee80211_add_scan(struct ieee80211vap *vap, 1118 const struct ieee80211_scanparams *sp, 1119 const struct ieee80211_frame *wh, 1120 int subtype, int rssi, int noise) 1121 { 1122 struct ieee80211com *ic = vap->iv_ic; 1123 struct ieee80211_scan_state *ss = ic->ic_scan; 1124 1125 /* XXX locking */ 1126 /* 1127 * Frames received during startup are discarded to avoid 1128 * using scan state setup on the initial entry to the timer 1129 * callback. This can occur because the device may enable 1130 * rx prior to our doing the initial channel change in the 1131 * timer routine. 1132 */ 1133 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD) 1134 return; 1135 #ifdef IEEE80211_DEBUG 1136 if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN)) 1137 dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi); 1138 #endif 1139 if (ss->ss_ops != NULL && 1140 ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise)) { 1141 /* 1142 * If we've reached the min dwell time terminate 1143 * the timer so we'll switch to the next channel. 1144 */ 1145 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 && 1146 time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) { 1147 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 1148 "%s: chan %3d%c min dwell met (%u > %lu)\n", 1149 __func__, 1150 ieee80211_chan2ieee(ic, ic->ic_curchan), 1151 channel_type(ic->ic_curchan), 1152 ticks, SCAN_PRIVATE(ss)->ss_chanmindwell); 1153 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL; 1154 /* 1155 * NB: trigger at next clock tick or wait for the 1156 * hardware. 1157 */ 1158 ic->ic_scan_mindwell(ss); 1159 } 1160 } 1161 } 1162 1163 /* 1164 * Timeout/age scan cache entries; called from sta timeout 1165 * timer (XXX should be self-contained). 1166 */ 1167 void 1168 ieee80211_scan_timeout(struct ieee80211com *ic) 1169 { 1170 struct ieee80211_scan_state *ss = ic->ic_scan; 1171 1172 if (ss->ss_ops != NULL) 1173 ss->ss_ops->scan_age(ss); 1174 } 1175 1176 /* 1177 * Mark a scan cache entry after a successful associate. 1178 */ 1179 void 1180 ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 1181 { 1182 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1183 1184 if (ss->ss_ops != NULL) { 1185 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 1186 mac, "%s", __func__); 1187 ss->ss_ops->scan_assoc_success(ss, mac); 1188 } 1189 } 1190 1191 /* 1192 * Demerit a scan cache entry after failing to associate. 1193 */ 1194 void 1195 ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 1196 const uint8_t mac[], int reason) 1197 { 1198 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1199 1200 if (ss->ss_ops != NULL) { 1201 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 1202 "%s: reason %u", __func__, reason); 1203 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 1204 } 1205 } 1206 1207 /* 1208 * Iterate over the contents of the scan cache. 1209 */ 1210 void 1211 ieee80211_scan_iterate(struct ieee80211vap *vap, 1212 ieee80211_scan_iter_func *f, void *arg) 1213 { 1214 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1215 1216 if (ss->ss_ops != NULL) 1217 ss->ss_ops->scan_iterate(ss, f, arg); 1218 } 1219 1220 /* 1221 * Flush the contents of the scan cache. 1222 */ 1223 void 1224 ieee80211_scan_flush(struct ieee80211vap *vap) 1225 { 1226 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 1227 1228 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 1229 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 1230 ss->ss_ops->scan_flush(ss); 1231 } 1232 } 1233 1234 /* 1235 * Check the scan cache for an ap/channel to use; if that 1236 * fails then kick off a new scan. 1237 */ 1238 struct ieee80211_channel * 1239 ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 1240 { 1241 struct ieee80211_scan_state *ss = ic->ic_scan; 1242 1243 IEEE80211_LOCK_ASSERT(ic); 1244 1245 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 1246 /* XXX printf? */ 1247 return NULL; 1248 } 1249 if (ss->ss_ops->scan_pickchan == NULL) { 1250 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 1251 "%s: scan module does not support picking a channel, " 1252 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 1253 return NULL; 1254 } 1255 return ss->ss_ops->scan_pickchan(ss, flags); 1256 } 1257