1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 /* 32 * IEEE 802.11 scanning support. 33 */ 34 #include "opt_wlan.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/proc.h> 39 #include <sys/kernel.h> 40 #include <sys/malloc.h> 41 #include <sys/condvar.h> 42 43 #include <sys/socket.h> 44 45 #include <net/if.h> 46 #include <net/if_var.h> 47 #include <net/if_media.h> 48 #include <net/ethernet.h> 49 50 #include <net80211/ieee80211_var.h> 51 52 /* XXX until it's implemented as attach ops */ 53 #include <net80211/ieee80211_scan_sw.h> 54 55 #include <net/bpf.h> 56 57 /* 58 * Roaming-related defaults. RSSI thresholds are as returned by the 59 * driver (.5dBm). Transmit rate thresholds are IEEE rate codes (i.e 60 * .5M units) or MCS. 61 */ 62 /* rssi thresholds */ 63 #define ROAM_RSSI_11A_DEFAULT 14 /* 11a bss */ 64 #define ROAM_RSSI_11B_DEFAULT 14 /* 11b bss */ 65 #define ROAM_RSSI_11BONLY_DEFAULT 14 /* 11b-only bss */ 66 /* transmit rate thresholds */ 67 #define ROAM_RATE_11A_DEFAULT 2*12 /* 11a bss */ 68 #define ROAM_RATE_11B_DEFAULT 2*5 /* 11b bss */ 69 #define ROAM_RATE_11BONLY_DEFAULT 2*1 /* 11b-only bss */ 70 #define ROAM_RATE_HALF_DEFAULT 2*6 /* half-width 11a/g bss */ 71 #define ROAM_RATE_QUARTER_DEFAULT 2*3 /* quarter-width 11a/g bss */ 72 #define ROAM_MCS_11N_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11n bss */ 73 #define ROAM_MCS_11AC_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11ac bss; XXX not used yet */ 74 75 void 76 ieee80211_scan_attach(struct ieee80211com *ic) 77 { 78 /* 79 * If there's no scan method pointer, attach the 80 * swscan set as a default. 81 */ 82 if (ic->ic_scan_methods == NULL) 83 ieee80211_swscan_attach(ic); 84 else 85 ic->ic_scan_methods->sc_attach(ic); 86 } 87 88 void 89 ieee80211_scan_detach(struct ieee80211com *ic) 90 { 91 92 /* 93 * Ideally we'd do the ss_ops detach call here; 94 * but then sc_detach() would need to be split in two. 95 * 96 * I'll do that later. 97 */ 98 ic->ic_scan_methods->sc_detach(ic); 99 } 100 101 static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = { 102 [IEEE80211_MODE_11A] = { .rssi = ROAM_RSSI_11A_DEFAULT, 103 .rate = ROAM_RATE_11A_DEFAULT }, 104 [IEEE80211_MODE_11G] = { .rssi = ROAM_RSSI_11B_DEFAULT, 105 .rate = ROAM_RATE_11B_DEFAULT }, 106 [IEEE80211_MODE_11B] = { .rssi = ROAM_RSSI_11BONLY_DEFAULT, 107 .rate = ROAM_RATE_11BONLY_DEFAULT }, 108 [IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT, 109 .rate = ROAM_RATE_11A_DEFAULT }, 110 [IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT, 111 .rate = ROAM_RATE_11A_DEFAULT }, 112 [IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT, 113 .rate = ROAM_RATE_11A_DEFAULT }, 114 [IEEE80211_MODE_HALF] = { .rssi = ROAM_RSSI_11A_DEFAULT, 115 .rate = ROAM_RATE_HALF_DEFAULT }, 116 [IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT, 117 .rate = ROAM_RATE_QUARTER_DEFAULT }, 118 [IEEE80211_MODE_11NA] = { .rssi = ROAM_RSSI_11A_DEFAULT, 119 .rate = ROAM_MCS_11N_DEFAULT }, 120 [IEEE80211_MODE_11NG] = { .rssi = ROAM_RSSI_11B_DEFAULT, 121 .rate = ROAM_MCS_11N_DEFAULT }, 122 [IEEE80211_MODE_VHT_2GHZ] = { .rssi = ROAM_RSSI_11B_DEFAULT, 123 .rate = ROAM_MCS_11AC_DEFAULT }, 124 [IEEE80211_MODE_VHT_5GHZ] = { .rssi = ROAM_RSSI_11A_DEFAULT, 125 .rate = ROAM_MCS_11AC_DEFAULT }, 126 127 }; 128 129 void 130 ieee80211_scan_vattach(struct ieee80211vap *vap) 131 { 132 struct ieee80211com *ic = vap->iv_ic; 133 134 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz; 135 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz; 136 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz; 137 138 vap->iv_roaming = IEEE80211_ROAMING_AUTO; 139 memcpy(vap->iv_roamparms, defroam, sizeof(defroam)); 140 141 ic->ic_scan_methods->sc_vattach(vap); 142 } 143 144 void 145 ieee80211_scan_vdetach(struct ieee80211vap *vap) 146 { 147 struct ieee80211com *ic = vap->iv_ic; 148 struct ieee80211_scan_state *ss; 149 150 IEEE80211_LOCK(ic); 151 ss = ic->ic_scan; 152 153 ic->ic_scan_methods->sc_vdetach(vap); 154 155 if (ss != NULL && ss->ss_vap == vap) { 156 if (ss->ss_ops != NULL) { 157 ss->ss_ops->scan_detach(ss); 158 ss->ss_ops = NULL; 159 } 160 ss->ss_vap = NULL; 161 } 162 IEEE80211_UNLOCK(ic); 163 } 164 165 /* 166 * Simple-minded scanner module support. 167 */ 168 static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 169 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 170 "wlan_scan_sta", /* IEEE80211_M_STA */ 171 "wlan_scan_wds", /* IEEE80211_M_WDS */ 172 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 173 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 174 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 175 "wlan_scan_sta", /* IEEE80211_M_MBSS */ 176 }; 177 static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 178 179 const struct ieee80211_scanner * 180 ieee80211_scanner_get(enum ieee80211_opmode mode) 181 { 182 if (mode >= IEEE80211_OPMODE_MAX) 183 return NULL; 184 if (scanners[mode] == NULL) 185 ieee80211_load_module(scan_modnames[mode]); 186 return scanners[mode]; 187 } 188 189 void 190 ieee80211_scanner_register(enum ieee80211_opmode mode, 191 const struct ieee80211_scanner *scan) 192 { 193 if (mode >= IEEE80211_OPMODE_MAX) 194 return; 195 scanners[mode] = scan; 196 } 197 198 void 199 ieee80211_scanner_unregister(enum ieee80211_opmode mode, 200 const struct ieee80211_scanner *scan) 201 { 202 if (mode >= IEEE80211_OPMODE_MAX) 203 return; 204 if (scanners[mode] == scan) 205 scanners[mode] = NULL; 206 } 207 208 void 209 ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 210 { 211 int m; 212 213 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 214 if (scanners[m] == scan) 215 scanners[m] = NULL; 216 } 217 218 /* 219 * Update common scanner state to reflect the current 220 * operating mode. This is called when the state machine 221 * is transitioned to RUN state w/o scanning--e.g. when 222 * operating in monitor mode. The purpose of this is to 223 * ensure later callbacks find ss_ops set to properly 224 * reflect current operating mode. 225 */ 226 void 227 ieee80211_scan_update_locked(struct ieee80211vap *vap, 228 const struct ieee80211_scanner *scan) 229 { 230 struct ieee80211com *ic = vap->iv_ic; 231 struct ieee80211_scan_state *ss = ic->ic_scan; 232 233 IEEE80211_LOCK_ASSERT(ic); 234 235 #ifdef IEEE80211_DEBUG 236 if (ss->ss_vap != vap || ss->ss_ops != scan) { 237 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 238 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 239 __func__, 240 ss->ss_vap != NULL ? 241 ss->ss_vap->iv_ifp->if_xname : "none", 242 ss->ss_vap != NULL ? 243 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 244 vap->iv_ifp->if_xname, 245 ieee80211_opmode_name[vap->iv_opmode]); 246 } 247 #endif 248 ss->ss_vap = vap; 249 if (ss->ss_ops != scan) { 250 /* 251 * Switch scanners; detach old, attach new. Special 252 * case where a single scan module implements multiple 253 * policies by using different scan ops but a common 254 * core. We assume if the old and new attach methods 255 * are identical then it's ok to just change ss_ops 256 * and not flush the internal state of the module. 257 */ 258 if (scan == NULL || ss->ss_ops == NULL || 259 ss->ss_ops->scan_attach != scan->scan_attach) { 260 if (ss->ss_ops != NULL) 261 ss->ss_ops->scan_detach(ss); 262 if (scan != NULL && !scan->scan_attach(ss)) { 263 /* XXX attach failure */ 264 /* XXX stat+msg */ 265 scan = NULL; 266 } 267 } 268 ss->ss_ops = scan; 269 } 270 } 271 272 void 273 ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 274 { 275 struct ieee80211com *ic = ss->ss_ic; 276 const char *sep; 277 int i; 278 279 sep = ""; 280 for (i = ss->ss_next; i < ss->ss_last; i++) { 281 const struct ieee80211_channel *c = ss->ss_chans[i]; 282 283 printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 284 ieee80211_channel_type_char(c)); 285 sep = ", "; 286 } 287 } 288 289 #ifdef IEEE80211_DEBUG 290 void 291 ieee80211_scan_dump(struct ieee80211_scan_state *ss) 292 { 293 struct ieee80211vap *vap = ss->ss_vap; 294 295 if_printf(vap->iv_ifp, "scan set "); 296 ieee80211_scan_dump_channels(ss); 297 printf(" dwell min %lums max %lums\n", 298 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 299 } 300 #endif /* IEEE80211_DEBUG */ 301 302 void 303 ieee80211_scan_copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 304 int nssid, const struct ieee80211_scan_ssid ssids[]) 305 { 306 if (nssid > IEEE80211_SCAN_MAX_SSID) { 307 /* XXX printf */ 308 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 309 "%s: too many ssid %d, ignoring all of them\n", 310 __func__, nssid); 311 return; 312 } 313 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 314 ss->ss_nssid = nssid; 315 } 316 317 /* 318 * Start a scan unless one is already going. 319 */ 320 int 321 ieee80211_start_scan(struct ieee80211vap *vap, int flags, 322 u_int duration, u_int mindwell, u_int maxdwell, 323 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 324 { 325 const struct ieee80211_scanner *scan; 326 struct ieee80211com *ic = vap->iv_ic; 327 328 scan = ieee80211_scanner_get(vap->iv_opmode); 329 if (scan == NULL) { 330 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 331 "%s: no scanner support for %s mode\n", 332 __func__, ieee80211_opmode_name[vap->iv_opmode]); 333 /* XXX stat */ 334 return 0; 335 } 336 337 return ic->ic_scan_methods->sc_start_scan(scan, vap, flags, duration, 338 mindwell, maxdwell, nssid, ssids); 339 } 340 341 /* 342 * Check the scan cache for an ap/channel to use; if that 343 * fails then kick off a new scan. 344 */ 345 int 346 ieee80211_check_scan(struct ieee80211vap *vap, int flags, 347 u_int duration, u_int mindwell, u_int maxdwell, 348 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 349 { 350 struct ieee80211com *ic = vap->iv_ic; 351 struct ieee80211_scan_state *ss = ic->ic_scan; 352 const struct ieee80211_scanner *scan; 353 int result; 354 355 scan = ieee80211_scanner_get(vap->iv_opmode); 356 if (scan == NULL) { 357 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 358 "%s: no scanner support for %s mode\n", 359 __func__, vap->iv_opmode); 360 /* XXX stat */ 361 return 0; 362 } 363 364 /* 365 * Check if there's a list of scan candidates already. 366 * XXX want more than the ap we're currently associated with 367 */ 368 369 IEEE80211_LOCK(ic); 370 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 371 "%s: %s scan, %s%s%s%s%s\n" 372 , __func__ 373 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 374 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 375 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 376 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 377 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 378 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 379 ); 380 381 if (ss->ss_ops != scan) { 382 /* XXX re-use cache contents? e.g. adhoc<->sta */ 383 flags |= IEEE80211_SCAN_FLUSH; 384 } 385 386 /* 387 * XXX TODO: separate things out a bit better. 388 */ 389 ieee80211_scan_update_locked(vap, scan); 390 391 result = ic->ic_scan_methods->sc_check_scan(scan, vap, flags, duration, 392 mindwell, maxdwell, nssid, ssids); 393 394 IEEE80211_UNLOCK(ic); 395 396 return (result); 397 } 398 399 /* 400 * Check the scan cache for an ap/channel to use; if that fails 401 * then kick off a scan using the current settings. 402 */ 403 int 404 ieee80211_check_scan_current(struct ieee80211vap *vap) 405 { 406 return ieee80211_check_scan(vap, 407 IEEE80211_SCAN_ACTIVE, 408 IEEE80211_SCAN_FOREVER, 0, 0, 409 vap->iv_des_nssid, vap->iv_des_ssid); 410 } 411 412 /* 413 * Restart a previous scan. If the previous scan completed 414 * then we start again using the existing channel list. 415 */ 416 int 417 ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 418 { 419 struct ieee80211com *ic = vap->iv_ic; 420 const struct ieee80211_scanner *scan; 421 422 // IEEE80211_UNLOCK_ASSERT(sc); 423 424 scan = ieee80211_scanner_get(vap->iv_opmode); 425 if (scan == NULL) { 426 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 427 "%s: no scanner support for %s mode\n", 428 __func__, vap->iv_opmode); 429 /* XXX stat */ 430 return 0; 431 } 432 433 /* 434 * XXX TODO: pull apart the bgscan logic into whatever 435 * belongs here and whatever belongs in the software 436 * scanner. 437 */ 438 return (ic->ic_scan_methods->sc_bg_scan(scan, vap, flags)); 439 } 440 441 /* 442 * Cancel any scan currently going on for the specified vap. 443 */ 444 void 445 ieee80211_cancel_scan(struct ieee80211vap *vap) 446 { 447 struct ieee80211com *ic = vap->iv_ic; 448 449 ic->ic_scan_methods->sc_cancel_scan(vap); 450 } 451 452 /* 453 * Cancel any scan currently going on. 454 * 455 * This is called during normal 802.11 data path to cancel 456 * a scan so a newly arrived normal data packet can be sent. 457 */ 458 void 459 ieee80211_cancel_anyscan(struct ieee80211vap *vap) 460 { 461 struct ieee80211com *ic = vap->iv_ic; 462 463 ic->ic_scan_methods->sc_cancel_anyscan(vap); 464 } 465 466 /* 467 * Manually switch to the next channel in the channel list. 468 * Provided for drivers that manage scanning themselves 469 * (e.g. for firmware-based devices). 470 */ 471 void 472 ieee80211_scan_next(struct ieee80211vap *vap) 473 { 474 struct ieee80211com *ic = vap->iv_ic; 475 476 ic->ic_scan_methods->sc_scan_next(vap); 477 } 478 479 /* 480 * Manually stop a scan that is currently running. 481 * Provided for drivers that are not able to scan single channels 482 * (e.g. for firmware-based devices). 483 */ 484 void 485 ieee80211_scan_done(struct ieee80211vap *vap) 486 { 487 struct ieee80211com *ic = vap->iv_ic; 488 struct ieee80211_scan_state *ss; 489 490 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__); 491 492 IEEE80211_LOCK(ic); 493 ss = ic->ic_scan; 494 ss->ss_next = ss->ss_last; /* all channels are complete */ 495 496 ic->ic_scan_methods->sc_scan_done(vap); 497 498 IEEE80211_UNLOCK(ic); 499 } 500 501 /* 502 * Probe the current channel, if allowed, while scanning. 503 * If the channel is not marked passive-only then send 504 * a probe request immediately. Otherwise mark state and 505 * listen for beacons on the channel; if we receive something 506 * then we'll transmit a probe request. 507 */ 508 void 509 ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 510 { 511 struct ieee80211com *ic = vap->iv_ic; 512 513 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 514 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 515 return; 516 } 517 518 ic->ic_scan_methods->sc_scan_probe_curchan(vap, force); 519 } 520 521 #ifdef IEEE80211_DEBUG 522 static void 523 dump_country(const uint8_t *ie) 524 { 525 const struct ieee80211_country_ie *cie = 526 (const struct ieee80211_country_ie *) ie; 527 int i, nbands, schan, nchan; 528 529 if (cie->len < 3) { 530 printf(" <bogus country ie, len %d>", cie->len); 531 return; 532 } 533 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 534 nbands = (cie->len - 3) / sizeof(cie->band[0]); 535 for (i = 0; i < nbands; i++) { 536 schan = cie->band[i].schan; 537 nchan = cie->band[i].nchan; 538 if (nchan != 1) 539 printf(" %u-%u,%u", schan, schan + nchan-1, 540 cie->band[i].maxtxpwr); 541 else 542 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 543 } 544 printf("]"); 545 } 546 547 void 548 ieee80211_scan_dump_probe_beacon(uint8_t subtype, int isnew, 549 const uint8_t mac[IEEE80211_ADDR_LEN], 550 const struct ieee80211_scanparams *sp, int rssi) 551 { 552 553 printf("[%s] %s%s on chan %u (bss chan %u) ", 554 ether_sprintf(mac), isnew ? "new " : "", 555 ieee80211_mgt_subtype_name(subtype), sp->chan, sp->bchan); 556 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 557 printf(" rssi %d\n", rssi); 558 559 if (isnew) { 560 printf("[%s] caps 0x%x bintval %u erp 0x%x", 561 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 562 if (sp->country != NULL) 563 dump_country(sp->country); 564 printf("\n"); 565 } 566 } 567 #endif /* IEEE80211_DEBUG */ 568 569 /* 570 * Process a beacon or probe response frame. 571 */ 572 void 573 ieee80211_add_scan(struct ieee80211vap *vap, 574 struct ieee80211_channel *curchan, 575 const struct ieee80211_scanparams *sp, 576 const struct ieee80211_frame *wh, 577 int subtype, int rssi, int noise) 578 { 579 struct ieee80211com *ic = vap->iv_ic; 580 581 return (ic->ic_scan_methods->sc_add_scan(vap, curchan, sp, wh, subtype, 582 rssi, noise)); 583 } 584 585 /* 586 * Timeout/age scan cache entries; called from sta timeout 587 * timer (XXX should be self-contained). 588 */ 589 void 590 ieee80211_scan_timeout(struct ieee80211com *ic) 591 { 592 struct ieee80211_scan_state *ss = ic->ic_scan; 593 594 if (ss->ss_ops != NULL) 595 ss->ss_ops->scan_age(ss); 596 } 597 598 /* 599 * Mark a scan cache entry after a successful associate. 600 */ 601 void 602 ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[]) 603 { 604 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 605 606 if (ss->ss_ops != NULL) { 607 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 608 mac, "%s", __func__); 609 ss->ss_ops->scan_assoc_success(ss, mac); 610 } 611 } 612 613 /* 614 * Demerit a scan cache entry after failing to associate. 615 */ 616 void 617 ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 618 const uint8_t mac[], int reason) 619 { 620 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 621 622 if (ss->ss_ops != NULL) { 623 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 624 "%s: reason %u", __func__, reason); 625 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 626 } 627 } 628 629 /* 630 * Iterate over the contents of the scan cache. 631 */ 632 void 633 ieee80211_scan_iterate(struct ieee80211vap *vap, 634 ieee80211_scan_iter_func *f, void *arg) 635 { 636 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 637 638 if (ss->ss_ops != NULL) 639 ss->ss_ops->scan_iterate(ss, f, arg); 640 } 641 642 /* 643 * Flush the contents of the scan cache. 644 */ 645 void 646 ieee80211_scan_flush(struct ieee80211vap *vap) 647 { 648 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 649 650 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 651 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 652 ss->ss_ops->scan_flush(ss); 653 } 654 } 655 656 /* 657 * Check the scan cache for an ap/channel to use; if that 658 * fails then kick off a new scan. 659 */ 660 struct ieee80211_channel * 661 ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 662 { 663 struct ieee80211_scan_state *ss = ic->ic_scan; 664 665 IEEE80211_LOCK_ASSERT(ic); 666 667 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 668 /* XXX printf? */ 669 return NULL; 670 } 671 if (ss->ss_ops->scan_pickchan == NULL) { 672 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 673 "%s: scan module does not support picking a channel, " 674 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 675 return NULL; 676 } 677 return ss->ss_ops->scan_pickchan(ss, flags); 678 } 679