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/malloc.h> 39 #include <sys/condvar.h> 40 41 #include <sys/socket.h> 42 43 #include <net/if.h> 44 #include <net/if_var.h> 45 #include <net/if_media.h> 46 #include <net/ethernet.h> 47 48 #include <net80211/ieee80211_var.h> 49 50 /* XXX until it's implemented as attach ops */ 51 #include <net80211/ieee80211_scan_sw.h> 52 53 #include <net/bpf.h> 54 55 /* 56 * Roaming-related defaults. RSSI thresholds are as returned by the 57 * driver (.5dBm). Transmit rate thresholds are IEEE rate codes (i.e 58 * .5M units) or MCS. 59 */ 60 /* rssi thresholds */ 61 #define ROAM_RSSI_11A_DEFAULT 14 /* 11a bss */ 62 #define ROAM_RSSI_11B_DEFAULT 14 /* 11b bss */ 63 #define ROAM_RSSI_11BONLY_DEFAULT 14 /* 11b-only bss */ 64 /* transmit rate thresholds */ 65 #define ROAM_RATE_11A_DEFAULT 2*12 /* 11a bss */ 66 #define ROAM_RATE_11B_DEFAULT 2*5 /* 11b bss */ 67 #define ROAM_RATE_11BONLY_DEFAULT 2*1 /* 11b-only bss */ 68 #define ROAM_RATE_HALF_DEFAULT 2*6 /* half-width 11a/g bss */ 69 #define ROAM_RATE_QUARTER_DEFAULT 2*3 /* quarter-width 11a/g bss */ 70 #define ROAM_MCS_11N_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11n bss */ 71 #define ROAM_MCS_11AC_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11ac bss; XXX not used yet */ 72 73 void 74 ieee80211_scan_attach(struct ieee80211com *ic) 75 { 76 /* 77 * If there's no scan method pointer, attach the 78 * swscan set as a default. 79 */ 80 if (ic->ic_scan_methods == NULL) 81 ieee80211_swscan_attach(ic); 82 else 83 ic->ic_scan_methods->sc_attach(ic); 84 } 85 86 void 87 ieee80211_scan_detach(struct ieee80211com *ic) 88 { 89 90 /* 91 * Ideally we'd do the ss_ops detach call here; 92 * but then sc_detach() would need to be split in two. 93 * 94 * I'll do that later. 95 */ 96 ic->ic_scan_methods->sc_detach(ic); 97 } 98 99 static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = { 100 [IEEE80211_MODE_11A] = { .rssi = ROAM_RSSI_11A_DEFAULT, 101 .rate = ROAM_RATE_11A_DEFAULT }, 102 [IEEE80211_MODE_11G] = { .rssi = ROAM_RSSI_11B_DEFAULT, 103 .rate = ROAM_RATE_11B_DEFAULT }, 104 [IEEE80211_MODE_11B] = { .rssi = ROAM_RSSI_11BONLY_DEFAULT, 105 .rate = ROAM_RATE_11BONLY_DEFAULT }, 106 [IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT, 107 .rate = ROAM_RATE_11A_DEFAULT }, 108 [IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT, 109 .rate = ROAM_RATE_11A_DEFAULT }, 110 [IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT, 111 .rate = ROAM_RATE_11A_DEFAULT }, 112 [IEEE80211_MODE_HALF] = { .rssi = ROAM_RSSI_11A_DEFAULT, 113 .rate = ROAM_RATE_HALF_DEFAULT }, 114 [IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT, 115 .rate = ROAM_RATE_QUARTER_DEFAULT }, 116 [IEEE80211_MODE_11NA] = { .rssi = ROAM_RSSI_11A_DEFAULT, 117 .rate = ROAM_MCS_11N_DEFAULT }, 118 [IEEE80211_MODE_11NG] = { .rssi = ROAM_RSSI_11B_DEFAULT, 119 .rate = ROAM_MCS_11N_DEFAULT }, 120 [IEEE80211_MODE_VHT_2GHZ] = { .rssi = ROAM_RSSI_11B_DEFAULT, 121 .rate = ROAM_MCS_11AC_DEFAULT }, 122 [IEEE80211_MODE_VHT_5GHZ] = { .rssi = ROAM_RSSI_11A_DEFAULT, 123 .rate = ROAM_MCS_11AC_DEFAULT }, 124 125 }; 126 127 void 128 ieee80211_scan_vattach(struct ieee80211vap *vap) 129 { 130 struct ieee80211com *ic = vap->iv_ic; 131 132 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz; 133 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz; 134 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz; 135 136 vap->iv_roaming = IEEE80211_ROAMING_AUTO; 137 memcpy(vap->iv_roamparms, defroam, sizeof(defroam)); 138 139 ic->ic_scan_methods->sc_vattach(vap); 140 } 141 142 void 143 ieee80211_scan_vdetach(struct ieee80211vap *vap) 144 { 145 struct ieee80211com *ic = vap->iv_ic; 146 struct ieee80211_scan_state *ss; 147 148 IEEE80211_LOCK(ic); 149 ss = ic->ic_scan; 150 151 ic->ic_scan_methods->sc_vdetach(vap); 152 153 if (ss != NULL && ss->ss_vap == vap) { 154 if (ss->ss_ops != NULL) { 155 ss->ss_ops->scan_detach(ss); 156 ss->ss_ops = NULL; 157 } 158 ss->ss_vap = NULL; 159 } 160 IEEE80211_UNLOCK(ic); 161 } 162 163 /* 164 * Simple-minded scanner module support. 165 */ 166 static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 167 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 168 "wlan_scan_sta", /* IEEE80211_M_STA */ 169 "wlan_scan_wds", /* IEEE80211_M_WDS */ 170 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 171 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 172 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 173 "wlan_scan_sta", /* IEEE80211_M_MBSS */ 174 }; 175 static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 176 177 const struct ieee80211_scanner * 178 ieee80211_scanner_get(enum ieee80211_opmode mode) 179 { 180 if (mode >= IEEE80211_OPMODE_MAX) 181 return NULL; 182 if (scanners[mode] == NULL) 183 ieee80211_load_module(scan_modnames[mode]); 184 return scanners[mode]; 185 } 186 187 void 188 ieee80211_scanner_register(enum ieee80211_opmode mode, 189 const struct ieee80211_scanner *scan) 190 { 191 if (mode >= IEEE80211_OPMODE_MAX) 192 return; 193 scanners[mode] = scan; 194 } 195 196 void 197 ieee80211_scanner_unregister(enum ieee80211_opmode mode, 198 const struct ieee80211_scanner *scan) 199 { 200 if (mode >= IEEE80211_OPMODE_MAX) 201 return; 202 if (scanners[mode] == scan) 203 scanners[mode] = NULL; 204 } 205 206 void 207 ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 208 { 209 int m; 210 211 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 212 if (scanners[m] == scan) 213 scanners[m] = NULL; 214 } 215 216 /* 217 * Update common scanner state to reflect the current 218 * operating mode. This is called when the state machine 219 * is transitioned to RUN state w/o scanning--e.g. when 220 * operating in monitor mode. The purpose of this is to 221 * ensure later callbacks find ss_ops set to properly 222 * reflect current operating mode. 223 */ 224 void 225 ieee80211_scan_update_locked(struct ieee80211vap *vap, 226 const struct ieee80211_scanner *scan) 227 { 228 struct ieee80211com *ic = vap->iv_ic; 229 struct ieee80211_scan_state *ss = ic->ic_scan; 230 231 IEEE80211_LOCK_ASSERT(ic); 232 233 #ifdef IEEE80211_DEBUG 234 if (ss->ss_vap != vap || ss->ss_ops != scan) { 235 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 236 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 237 __func__, 238 ss->ss_vap != NULL ? 239 ss->ss_vap->iv_ifp->if_xname : "none", 240 ss->ss_vap != NULL ? 241 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 242 vap->iv_ifp->if_xname, 243 ieee80211_opmode_name[vap->iv_opmode]); 244 } 245 #endif 246 ss->ss_vap = vap; 247 if (ss->ss_ops != scan) { 248 /* 249 * Switch scanners; detach old, attach new. Special 250 * case where a single scan module implements multiple 251 * policies by using different scan ops but a common 252 * core. We assume if the old and new attach methods 253 * are identical then it's ok to just change ss_ops 254 * and not flush the internal state of the module. 255 */ 256 if (scan == NULL || ss->ss_ops == NULL || 257 ss->ss_ops->scan_attach != scan->scan_attach) { 258 if (ss->ss_ops != NULL) 259 ss->ss_ops->scan_detach(ss); 260 if (scan != NULL && !scan->scan_attach(ss)) { 261 /* XXX attach failure */ 262 /* XXX stat+msg */ 263 scan = NULL; 264 } 265 } 266 ss->ss_ops = scan; 267 } 268 } 269 270 void 271 ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 272 { 273 struct ieee80211com *ic = ss->ss_ic; 274 const char *sep; 275 int i; 276 277 sep = ""; 278 for (i = ss->ss_next; i < ss->ss_last; i++) { 279 const struct ieee80211_channel *c = ss->ss_chans[i]; 280 281 printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 282 ieee80211_channel_type_char(c)); 283 sep = ", "; 284 } 285 } 286 287 #ifdef IEEE80211_DEBUG 288 void 289 ieee80211_scan_dump(struct ieee80211_scan_state *ss) 290 { 291 struct ieee80211vap *vap = ss->ss_vap; 292 293 if_printf(vap->iv_ifp, "scan set "); 294 ieee80211_scan_dump_channels(ss); 295 printf(" dwell min %lums max %lums\n", 296 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 297 } 298 #endif /* IEEE80211_DEBUG */ 299 300 void 301 ieee80211_scan_copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 302 int nssid, const struct ieee80211_scan_ssid ssids[]) 303 { 304 if (nssid > IEEE80211_SCAN_MAX_SSID) { 305 /* XXX printf */ 306 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 307 "%s: too many ssid %d, ignoring all of them\n", 308 __func__, nssid); 309 return; 310 } 311 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 312 ss->ss_nssid = nssid; 313 } 314 315 /* 316 * Start a scan unless one is already going. 317 */ 318 int 319 ieee80211_start_scan(struct ieee80211vap *vap, int flags, 320 u_int duration, u_int mindwell, u_int maxdwell, 321 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 322 { 323 const struct ieee80211_scanner *scan; 324 struct ieee80211com *ic = vap->iv_ic; 325 326 scan = ieee80211_scanner_get(vap->iv_opmode); 327 if (scan == NULL) { 328 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 329 "%s: no scanner support for %s mode\n", 330 __func__, ieee80211_opmode_name[vap->iv_opmode]); 331 /* XXX stat */ 332 return 0; 333 } 334 335 return ic->ic_scan_methods->sc_start_scan(scan, vap, flags, duration, 336 mindwell, maxdwell, nssid, ssids); 337 } 338 339 /* 340 * Check the scan cache for an ap/channel to use; if that 341 * fails then kick off a new scan. 342 */ 343 int 344 ieee80211_check_scan(struct ieee80211vap *vap, int flags, 345 u_int duration, u_int mindwell, u_int maxdwell, 346 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 347 { 348 struct ieee80211com *ic = vap->iv_ic; 349 struct ieee80211_scan_state *ss = ic->ic_scan; 350 const struct ieee80211_scanner *scan; 351 int result; 352 353 scan = ieee80211_scanner_get(vap->iv_opmode); 354 if (scan == NULL) { 355 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 356 "%s: no scanner support for %s mode\n", 357 __func__, vap->iv_opmode); 358 /* XXX stat */ 359 return 0; 360 } 361 362 /* 363 * Check if there's a list of scan candidates already. 364 * XXX want more than the ap we're currently associated with 365 */ 366 367 IEEE80211_LOCK(ic); 368 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 369 "%s: %s scan, %s%s%s%s%s\n" 370 , __func__ 371 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 372 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 373 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 374 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 375 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 376 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 377 ); 378 379 if (ss->ss_ops != scan) { 380 /* XXX re-use cache contents? e.g. adhoc<->sta */ 381 flags |= IEEE80211_SCAN_FLUSH; 382 } 383 384 /* 385 * XXX TODO: separate things out a bit better. 386 */ 387 ieee80211_scan_update_locked(vap, scan); 388 389 result = ic->ic_scan_methods->sc_check_scan(scan, vap, flags, duration, 390 mindwell, maxdwell, nssid, ssids); 391 392 IEEE80211_UNLOCK(ic); 393 394 return (result); 395 } 396 397 /* 398 * Check the scan cache for an ap/channel to use; if that fails 399 * then kick off a scan using the current settings. 400 */ 401 int 402 ieee80211_check_scan_current(struct ieee80211vap *vap) 403 { 404 return ieee80211_check_scan(vap, 405 IEEE80211_SCAN_ACTIVE, 406 IEEE80211_SCAN_FOREVER, 0, 0, 407 vap->iv_des_nssid, vap->iv_des_ssid); 408 } 409 410 /* 411 * Restart a previous scan. If the previous scan completed 412 * then we start again using the existing channel list. 413 */ 414 int 415 ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 416 { 417 struct ieee80211com *ic = vap->iv_ic; 418 const struct ieee80211_scanner *scan; 419 420 // IEEE80211_UNLOCK_ASSERT(sc); 421 422 scan = ieee80211_scanner_get(vap->iv_opmode); 423 if (scan == NULL) { 424 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 425 "%s: no scanner support for %s mode\n", 426 __func__, vap->iv_opmode); 427 /* XXX stat */ 428 return 0; 429 } 430 431 /* 432 * XXX TODO: pull apart the bgscan logic into whatever 433 * belongs here and whatever belongs in the software 434 * scanner. 435 */ 436 return (ic->ic_scan_methods->sc_bg_scan(scan, vap, flags)); 437 } 438 439 /* 440 * Cancel any scan currently going on for the specified vap. 441 */ 442 void 443 ieee80211_cancel_scan(struct ieee80211vap *vap) 444 { 445 struct ieee80211com *ic = vap->iv_ic; 446 447 ic->ic_scan_methods->sc_cancel_scan(vap); 448 } 449 450 /* 451 * Cancel any scan currently going on. 452 * 453 * This is called during normal 802.11 data path to cancel 454 * a scan so a newly arrived normal data packet can be sent. 455 */ 456 void 457 ieee80211_cancel_anyscan(struct ieee80211vap *vap) 458 { 459 struct ieee80211com *ic = vap->iv_ic; 460 461 ic->ic_scan_methods->sc_cancel_anyscan(vap); 462 } 463 464 /* 465 * Manually switch to the next channel in the channel list. 466 * Provided for drivers that manage scanning themselves 467 * (e.g. for firmware-based devices). 468 */ 469 void 470 ieee80211_scan_next(struct ieee80211vap *vap) 471 { 472 struct ieee80211com *ic = vap->iv_ic; 473 474 ic->ic_scan_methods->sc_scan_next(vap); 475 } 476 477 /* 478 * Manually stop a scan that is currently running. 479 * Provided for drivers that are not able to scan single channels 480 * (e.g. for firmware-based devices). 481 */ 482 void 483 ieee80211_scan_done(struct ieee80211vap *vap) 484 { 485 struct ieee80211com *ic = vap->iv_ic; 486 struct ieee80211_scan_state *ss; 487 488 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__); 489 490 IEEE80211_LOCK(ic); 491 ss = ic->ic_scan; 492 ss->ss_next = ss->ss_last; /* all channels are complete */ 493 494 ic->ic_scan_methods->sc_scan_done(vap); 495 496 IEEE80211_UNLOCK(ic); 497 } 498 499 /* 500 * Probe the current channel, if allowed, while scanning. 501 * If the channel is not marked passive-only then send 502 * a probe request immediately. Otherwise mark state and 503 * listen for beacons on the channel; if we receive something 504 * then we'll transmit a probe request. 505 */ 506 void 507 ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 508 { 509 struct ieee80211com *ic = vap->iv_ic; 510 511 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 512 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 513 return; 514 } 515 516 ic->ic_scan_methods->sc_scan_probe_curchan(vap, force); 517 } 518 519 #ifdef IEEE80211_DEBUG 520 static void 521 dump_country(const uint8_t *ie) 522 { 523 const struct ieee80211_country_ie *cie = 524 (const struct ieee80211_country_ie *) ie; 525 int i, nbands, schan, nchan; 526 527 if (cie->len < 3) { 528 printf(" <bogus country ie, len %d>", cie->len); 529 return; 530 } 531 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 532 nbands = (cie->len - 3) / sizeof(cie->band[0]); 533 for (i = 0; i < nbands; i++) { 534 schan = cie->band[i].schan; 535 nchan = cie->band[i].nchan; 536 if (nchan != 1) 537 printf(" %u-%u,%u", schan, schan + nchan-1, 538 cie->band[i].maxtxpwr); 539 else 540 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 541 } 542 printf("]"); 543 } 544 545 void 546 ieee80211_scan_dump_probe_beacon(uint8_t subtype, int isnew, 547 const uint8_t mac[IEEE80211_ADDR_LEN], 548 const struct ieee80211_scanparams *sp, int rssi) 549 { 550 551 printf("[%s] %s%s on chan %u (bss chan %u) ", 552 ether_sprintf(mac), isnew ? "new " : "", 553 ieee80211_mgt_subtype_name(subtype), sp->chan, sp->bchan); 554 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 555 printf(" rssi %d\n", rssi); 556 557 if (isnew) { 558 printf("[%s] caps 0x%x bintval %u erp 0x%x", 559 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 560 if (sp->country != NULL) 561 dump_country(sp->country); 562 printf("\n"); 563 } 564 } 565 #endif /* IEEE80211_DEBUG */ 566 567 /* 568 * Process a beacon or probe response frame. 569 */ 570 void 571 ieee80211_add_scan(struct ieee80211vap *vap, 572 struct ieee80211_channel *curchan, 573 const struct ieee80211_scanparams *sp, 574 const struct ieee80211_frame *wh, 575 int subtype, int rssi, int noise) 576 { 577 struct ieee80211com *ic = vap->iv_ic; 578 579 return (ic->ic_scan_methods->sc_add_scan(vap, curchan, sp, wh, subtype, 580 rssi, noise)); 581 } 582 583 /* 584 * Timeout/age scan cache entries; called from sta timeout 585 * timer (XXX should be self-contained). 586 */ 587 void 588 ieee80211_scan_timeout(struct ieee80211com *ic) 589 { 590 struct ieee80211_scan_state *ss = ic->ic_scan; 591 592 if (ss->ss_ops != NULL) 593 ss->ss_ops->scan_age(ss); 594 } 595 596 /* 597 * Mark a scan cache entry after a successful associate. 598 */ 599 void 600 ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 601 { 602 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 603 604 if (ss->ss_ops != NULL) { 605 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 606 mac, "%s", __func__); 607 ss->ss_ops->scan_assoc_success(ss, mac); 608 } 609 } 610 611 /* 612 * Demerit a scan cache entry after failing to associate. 613 */ 614 void 615 ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 616 const uint8_t mac[], int reason) 617 { 618 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 619 620 if (ss->ss_ops != NULL) { 621 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 622 "%s: reason %u", __func__, reason); 623 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 624 } 625 } 626 627 /* 628 * Iterate over the contents of the scan cache. 629 */ 630 void 631 ieee80211_scan_iterate(struct ieee80211vap *vap, 632 ieee80211_scan_iter_func *f, void *arg) 633 { 634 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 635 636 if (ss->ss_ops != NULL) 637 ss->ss_ops->scan_iterate(ss, f, arg); 638 } 639 640 /* 641 * Flush the contents of the scan cache. 642 */ 643 void 644 ieee80211_scan_flush(struct ieee80211vap *vap) 645 { 646 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 647 648 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 649 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 650 ss->ss_ops->scan_flush(ss); 651 } 652 } 653 654 /* 655 * Check the scan cache for an ap/channel to use; if that 656 * fails then kick off a new scan. 657 */ 658 struct ieee80211_channel * 659 ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 660 { 661 struct ieee80211_scan_state *ss = ic->ic_scan; 662 663 IEEE80211_LOCK_ASSERT(ic); 664 665 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 666 /* XXX printf? */ 667 return NULL; 668 } 669 if (ss->ss_ops->scan_pickchan == NULL) { 670 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 671 "%s: scan module does not support picking a channel, " 672 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 673 return NULL; 674 } 675 return ss->ss_ops->scan_pickchan(ss, flags); 676 } 677