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/if_private.h> 49 #include <net/ethernet.h> 50 51 #include <net80211/ieee80211_var.h> 52 53 /* XXX until it's implemented as attach ops */ 54 #include <net80211/ieee80211_scan_sw.h> 55 56 #include <net/bpf.h> 57 58 /* 59 * Roaming-related defaults. RSSI thresholds are as returned by the 60 * driver (.5dBm). Transmit rate thresholds are IEEE rate codes (i.e 61 * .5M units) or MCS. 62 */ 63 /* rssi thresholds */ 64 #define ROAM_RSSI_11A_DEFAULT 14 /* 11a bss */ 65 #define ROAM_RSSI_11B_DEFAULT 14 /* 11b bss */ 66 #define ROAM_RSSI_11BONLY_DEFAULT 14 /* 11b-only bss */ 67 /* transmit rate thresholds */ 68 #define ROAM_RATE_11A_DEFAULT 2*12 /* 11a bss */ 69 #define ROAM_RATE_11B_DEFAULT 2*5 /* 11b bss */ 70 #define ROAM_RATE_11BONLY_DEFAULT 2*1 /* 11b-only bss */ 71 #define ROAM_RATE_HALF_DEFAULT 2*6 /* half-width 11a/g bss */ 72 #define ROAM_RATE_QUARTER_DEFAULT 2*3 /* quarter-width 11a/g bss */ 73 #define ROAM_MCS_11N_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11n bss */ 74 #define ROAM_MCS_11AC_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11ac bss; XXX not used yet */ 75 76 void 77 ieee80211_scan_attach(struct ieee80211com *ic) 78 { 79 /* 80 * If there's no scan method pointer, attach the 81 * swscan set as a default. 82 */ 83 if (ic->ic_scan_methods == NULL) 84 ieee80211_swscan_attach(ic); 85 else 86 ic->ic_scan_methods->sc_attach(ic); 87 } 88 89 void 90 ieee80211_scan_detach(struct ieee80211com *ic) 91 { 92 93 /* 94 * Ideally we'd do the ss_ops detach call here; 95 * but then sc_detach() would need to be split in two. 96 * 97 * I'll do that later. 98 */ 99 ic->ic_scan_methods->sc_detach(ic); 100 } 101 102 static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = { 103 [IEEE80211_MODE_11A] = { .rssi = ROAM_RSSI_11A_DEFAULT, 104 .rate = ROAM_RATE_11A_DEFAULT }, 105 [IEEE80211_MODE_11G] = { .rssi = ROAM_RSSI_11B_DEFAULT, 106 .rate = ROAM_RATE_11B_DEFAULT }, 107 [IEEE80211_MODE_11B] = { .rssi = ROAM_RSSI_11BONLY_DEFAULT, 108 .rate = ROAM_RATE_11BONLY_DEFAULT }, 109 [IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT, 110 .rate = ROAM_RATE_11A_DEFAULT }, 111 [IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT, 112 .rate = ROAM_RATE_11A_DEFAULT }, 113 [IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT, 114 .rate = ROAM_RATE_11A_DEFAULT }, 115 [IEEE80211_MODE_HALF] = { .rssi = ROAM_RSSI_11A_DEFAULT, 116 .rate = ROAM_RATE_HALF_DEFAULT }, 117 [IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT, 118 .rate = ROAM_RATE_QUARTER_DEFAULT }, 119 [IEEE80211_MODE_11NA] = { .rssi = ROAM_RSSI_11A_DEFAULT, 120 .rate = ROAM_MCS_11N_DEFAULT }, 121 [IEEE80211_MODE_11NG] = { .rssi = ROAM_RSSI_11B_DEFAULT, 122 .rate = ROAM_MCS_11N_DEFAULT }, 123 [IEEE80211_MODE_VHT_2GHZ] = { .rssi = ROAM_RSSI_11B_DEFAULT, 124 .rate = ROAM_MCS_11AC_DEFAULT }, 125 [IEEE80211_MODE_VHT_5GHZ] = { .rssi = ROAM_RSSI_11A_DEFAULT, 126 .rate = ROAM_MCS_11AC_DEFAULT }, 127 128 }; 129 130 void 131 ieee80211_scan_vattach(struct ieee80211vap *vap) 132 { 133 struct ieee80211com *ic = vap->iv_ic; 134 int m; 135 136 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz; 137 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz; 138 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz; 139 140 vap->iv_roaming = IEEE80211_ROAMING_AUTO; 141 142 memset(vap->iv_roamparms, 0, sizeof(vap->iv_roamparms)); 143 for (m = IEEE80211_MODE_AUTO + 1; m < IEEE80211_MODE_MAX; m++) { 144 if (isclr(ic->ic_modecaps, m)) 145 continue; 146 147 memcpy(&vap->iv_roamparms[m], &defroam[m], sizeof(defroam[m])); 148 } 149 150 ic->ic_scan_methods->sc_vattach(vap); 151 } 152 153 void 154 ieee80211_scan_vdetach(struct ieee80211vap *vap) 155 { 156 struct ieee80211com *ic = vap->iv_ic; 157 struct ieee80211_scan_state *ss; 158 159 IEEE80211_LOCK(ic); 160 ss = ic->ic_scan; 161 162 ic->ic_scan_methods->sc_vdetach(vap); 163 164 if (ss != NULL && ss->ss_vap == vap) { 165 if (ss->ss_ops != NULL) { 166 ss->ss_ops->scan_detach(ss); 167 ss->ss_ops = NULL; 168 } 169 ss->ss_vap = NULL; 170 } 171 IEEE80211_UNLOCK(ic); 172 } 173 174 /* 175 * Simple-minded scanner module support. 176 */ 177 static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 178 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 179 "wlan_scan_sta", /* IEEE80211_M_STA */ 180 "wlan_scan_wds", /* IEEE80211_M_WDS */ 181 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 182 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 183 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 184 "wlan_scan_sta", /* IEEE80211_M_MBSS */ 185 }; 186 static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 187 188 const struct ieee80211_scanner * 189 ieee80211_scanner_get(enum ieee80211_opmode mode) 190 { 191 if (mode >= IEEE80211_OPMODE_MAX) 192 return NULL; 193 if (scanners[mode] == NULL) 194 ieee80211_load_module(scan_modnames[mode]); 195 return scanners[mode]; 196 } 197 198 void 199 ieee80211_scanner_register(enum ieee80211_opmode mode, 200 const struct ieee80211_scanner *scan) 201 { 202 if (mode >= IEEE80211_OPMODE_MAX) 203 return; 204 scanners[mode] = scan; 205 } 206 207 void 208 ieee80211_scanner_unregister(enum ieee80211_opmode mode, 209 const struct ieee80211_scanner *scan) 210 { 211 if (mode >= IEEE80211_OPMODE_MAX) 212 return; 213 if (scanners[mode] == scan) 214 scanners[mode] = NULL; 215 } 216 217 void 218 ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 219 { 220 int m; 221 222 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 223 if (scanners[m] == scan) 224 scanners[m] = NULL; 225 } 226 227 /* 228 * Update common scanner state to reflect the current 229 * operating mode. This is called when the state machine 230 * is transitioned to RUN state w/o scanning--e.g. when 231 * operating in monitor mode. The purpose of this is to 232 * ensure later callbacks find ss_ops set to properly 233 * reflect current operating mode. 234 */ 235 void 236 ieee80211_scan_update_locked(struct ieee80211vap *vap, 237 const struct ieee80211_scanner *scan) 238 { 239 struct ieee80211com *ic = vap->iv_ic; 240 struct ieee80211_scan_state *ss = ic->ic_scan; 241 242 IEEE80211_LOCK_ASSERT(ic); 243 244 #ifdef IEEE80211_DEBUG 245 if (ss->ss_vap != vap || ss->ss_ops != scan) { 246 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 247 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 248 __func__, 249 ss->ss_vap != NULL ? 250 ss->ss_vap->iv_ifp->if_xname : "none", 251 ss->ss_vap != NULL ? 252 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 253 vap->iv_ifp->if_xname, 254 ieee80211_opmode_name[vap->iv_opmode]); 255 } 256 #endif 257 ss->ss_vap = vap; 258 if (ss->ss_ops != scan) { 259 /* 260 * Switch scanners; detach old, attach new. Special 261 * case where a single scan module implements multiple 262 * policies by using different scan ops but a common 263 * core. We assume if the old and new attach methods 264 * are identical then it's ok to just change ss_ops 265 * and not flush the internal state of the module. 266 */ 267 if (scan == NULL || ss->ss_ops == NULL || 268 ss->ss_ops->scan_attach != scan->scan_attach) { 269 if (ss->ss_ops != NULL) 270 ss->ss_ops->scan_detach(ss); 271 if (scan != NULL && !scan->scan_attach(ss)) { 272 /* XXX attach failure */ 273 /* XXX stat+msg */ 274 scan = NULL; 275 } 276 } 277 ss->ss_ops = scan; 278 } 279 } 280 281 void 282 ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 283 { 284 struct ieee80211com *ic = ss->ss_ic; 285 const char *sep; 286 int i; 287 288 sep = ""; 289 for (i = ss->ss_next; i < ss->ss_last; i++) { 290 const struct ieee80211_channel *c = ss->ss_chans[i]; 291 292 printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 293 ieee80211_channel_type_char(c)); 294 sep = ", "; 295 } 296 } 297 298 #ifdef IEEE80211_DEBUG 299 void 300 ieee80211_scan_dump(struct ieee80211_scan_state *ss) 301 { 302 struct ieee80211vap *vap = ss->ss_vap; 303 304 if_printf(vap->iv_ifp, "scan set "); 305 ieee80211_scan_dump_channels(ss); 306 printf(" dwell min %ums max %ums\n", 307 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 308 } 309 #endif /* IEEE80211_DEBUG */ 310 311 void 312 ieee80211_scan_copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 313 int nssid, const struct ieee80211_scan_ssid ssids[]) 314 { 315 if (nssid > IEEE80211_SCAN_MAX_SSID) { 316 /* XXX printf */ 317 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 318 "%s: too many ssid %d, ignoring all of them\n", 319 __func__, nssid); 320 return; 321 } 322 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 323 ss->ss_nssid = nssid; 324 } 325 326 /* 327 * Start a scan unless one is already going. 328 */ 329 int 330 ieee80211_start_scan(struct ieee80211vap *vap, int flags, 331 u_int duration, u_int mindwell, u_int maxdwell, 332 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 333 { 334 const struct ieee80211_scanner *scan; 335 struct ieee80211com *ic = vap->iv_ic; 336 337 scan = ieee80211_scanner_get(vap->iv_opmode); 338 if (scan == NULL) { 339 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 340 "%s: no scanner support for %s mode\n", 341 __func__, ieee80211_opmode_name[vap->iv_opmode]); 342 /* XXX stat */ 343 return 0; 344 } 345 346 return ic->ic_scan_methods->sc_start_scan(scan, vap, flags, duration, 347 mindwell, maxdwell, nssid, ssids); 348 } 349 350 /* 351 * Check the scan cache for an ap/channel to use; if that 352 * fails then kick off a new scan. 353 */ 354 int 355 ieee80211_check_scan(struct ieee80211vap *vap, int flags, 356 u_int duration, u_int mindwell, u_int maxdwell, 357 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 358 { 359 struct ieee80211com *ic = vap->iv_ic; 360 struct ieee80211_scan_state *ss = ic->ic_scan; 361 const struct ieee80211_scanner *scan; 362 int result; 363 364 scan = ieee80211_scanner_get(vap->iv_opmode); 365 if (scan == NULL) { 366 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 367 "%s: no scanner support for %s mode\n", 368 __func__, vap->iv_opmode); 369 /* XXX stat */ 370 return 0; 371 } 372 373 /* 374 * Check if there's a list of scan candidates already. 375 * XXX want more than the ap we're currently associated with 376 */ 377 378 IEEE80211_LOCK(ic); 379 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 380 "%s: %s scan, %s%s%s%s%s\n" 381 , __func__ 382 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 383 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 384 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 385 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 386 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 387 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 388 ); 389 390 if (ss->ss_ops != scan) { 391 /* XXX re-use cache contents? e.g. adhoc<->sta */ 392 flags |= IEEE80211_SCAN_FLUSH; 393 } 394 395 /* 396 * XXX TODO: separate things out a bit better. 397 */ 398 ieee80211_scan_update_locked(vap, scan); 399 400 result = ic->ic_scan_methods->sc_check_scan(scan, vap, flags, duration, 401 mindwell, maxdwell, nssid, ssids); 402 403 IEEE80211_UNLOCK(ic); 404 405 return (result); 406 } 407 408 /* 409 * Check the scan cache for an ap/channel to use; if that fails 410 * then kick off a scan using the current settings. 411 */ 412 int 413 ieee80211_check_scan_current(struct ieee80211vap *vap) 414 { 415 return ieee80211_check_scan(vap, 416 IEEE80211_SCAN_ACTIVE, 417 IEEE80211_SCAN_FOREVER, 0, 0, 418 vap->iv_des_nssid, vap->iv_des_ssid); 419 } 420 421 /* 422 * Restart a previous scan. If the previous scan completed 423 * then we start again using the existing channel list. 424 */ 425 int 426 ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 427 { 428 struct ieee80211com *ic = vap->iv_ic; 429 const struct ieee80211_scanner *scan; 430 431 // IEEE80211_UNLOCK_ASSERT(sc); 432 433 scan = ieee80211_scanner_get(vap->iv_opmode); 434 if (scan == NULL) { 435 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 436 "%s: no scanner support for %s mode\n", 437 __func__, vap->iv_opmode); 438 /* XXX stat */ 439 return 0; 440 } 441 442 /* 443 * XXX TODO: pull apart the bgscan logic into whatever 444 * belongs here and whatever belongs in the software 445 * scanner. 446 */ 447 return (ic->ic_scan_methods->sc_bg_scan(scan, vap, flags)); 448 } 449 450 /* 451 * Cancel any scan currently going on for the specified vap. 452 */ 453 void 454 ieee80211_cancel_scan(struct ieee80211vap *vap) 455 { 456 struct ieee80211com *ic = vap->iv_ic; 457 458 ic->ic_scan_methods->sc_cancel_scan(vap); 459 } 460 461 /* 462 * Cancel any scan currently going on. 463 * 464 * This is called during normal 802.11 data path to cancel 465 * a scan so a newly arrived normal data packet can be sent. 466 */ 467 void 468 ieee80211_cancel_anyscan(struct ieee80211vap *vap) 469 { 470 struct ieee80211com *ic = vap->iv_ic; 471 472 ic->ic_scan_methods->sc_cancel_anyscan(vap); 473 } 474 475 /* 476 * Manually switch to the next channel in the channel list. 477 * Provided for drivers that manage scanning themselves 478 * (e.g. for firmware-based devices). 479 */ 480 void 481 ieee80211_scan_next(struct ieee80211vap *vap) 482 { 483 struct ieee80211com *ic = vap->iv_ic; 484 485 ic->ic_scan_methods->sc_scan_next(vap); 486 } 487 488 /* 489 * Manually stop a scan that is currently running. 490 * Provided for drivers that are not able to scan single channels 491 * (e.g. for firmware-based devices). 492 */ 493 void 494 ieee80211_scan_done(struct ieee80211vap *vap) 495 { 496 struct ieee80211com *ic = vap->iv_ic; 497 struct ieee80211_scan_state *ss; 498 499 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__); 500 501 IEEE80211_LOCK(ic); 502 ss = ic->ic_scan; 503 ss->ss_next = ss->ss_last; /* all channels are complete */ 504 505 ic->ic_scan_methods->sc_scan_done(vap); 506 507 IEEE80211_UNLOCK(ic); 508 } 509 510 /* 511 * Probe the current channel, if allowed, while scanning. 512 * If the channel is not marked passive-only then send 513 * a probe request immediately. Otherwise mark state and 514 * listen for beacons on the channel; if we receive something 515 * then we'll transmit a probe request. 516 */ 517 void 518 ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 519 { 520 struct ieee80211com *ic = vap->iv_ic; 521 522 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 523 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 524 return; 525 } 526 527 ic->ic_scan_methods->sc_scan_probe_curchan(vap, force); 528 } 529 530 #ifdef IEEE80211_DEBUG 531 static void 532 dump_country(const uint8_t *ie) 533 { 534 const struct ieee80211_country_ie *cie = 535 (const struct ieee80211_country_ie *) ie; 536 int i, nbands, schan, nchan; 537 538 if (cie->len < 3) { 539 printf(" <bogus country ie, len %d>", cie->len); 540 return; 541 } 542 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 543 nbands = (cie->len - 3) / sizeof(cie->band[0]); 544 for (i = 0; i < nbands; i++) { 545 schan = cie->band[i].schan; 546 nchan = cie->band[i].nchan; 547 if (nchan != 1) 548 printf(" %u-%u,%u", schan, schan + nchan-1, 549 cie->band[i].maxtxpwr); 550 else 551 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 552 } 553 printf("]"); 554 } 555 556 void 557 ieee80211_scan_dump_probe_beacon(uint8_t subtype, int isnew, 558 const uint8_t mac[IEEE80211_ADDR_LEN], 559 const struct ieee80211_scanparams *sp, int rssi) 560 { 561 562 printf("[%s] %s%s on chan %u (bss chan %u) ", 563 ether_sprintf(mac), isnew ? "new " : "", 564 ieee80211_mgt_subtype_name(subtype), sp->chan, sp->bchan); 565 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 566 printf(" rssi %d\n", rssi); 567 568 if (isnew) { 569 printf("[%s] caps 0x%x bintval %u erp 0x%x", 570 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 571 if (sp->country != NULL) 572 dump_country(sp->country); 573 printf("\n"); 574 } 575 } 576 #endif /* IEEE80211_DEBUG */ 577 578 /* 579 * Process a beacon or probe response frame. 580 */ 581 void 582 ieee80211_add_scan(struct ieee80211vap *vap, 583 struct ieee80211_channel *curchan, 584 const struct ieee80211_scanparams *sp, 585 const struct ieee80211_frame *wh, 586 int subtype, int rssi, int noise) 587 { 588 struct ieee80211com *ic = vap->iv_ic; 589 590 return (ic->ic_scan_methods->sc_add_scan(vap, curchan, sp, wh, subtype, 591 rssi, noise)); 592 } 593 594 /* 595 * Timeout/age scan cache entries; called from sta timeout 596 * timer (XXX should be self-contained). 597 */ 598 void 599 ieee80211_scan_timeout(struct ieee80211com *ic) 600 { 601 struct ieee80211_scan_state *ss = ic->ic_scan; 602 603 if (ss->ss_ops != NULL) 604 ss->ss_ops->scan_age(ss); 605 } 606 607 /* 608 * Mark a scan cache entry after a successful associate. 609 */ 610 void 611 ieee80211_scan_assoc_success(struct ieee80211vap *vap, 612 const uint8_t mac[IEEE80211_ADDR_LEN]) 613 { 614 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 615 616 if (ss->ss_ops != NULL) { 617 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 618 mac, "%s", __func__); 619 ss->ss_ops->scan_assoc_success(ss, mac); 620 } 621 } 622 623 /* 624 * Demerit a scan cache entry after failing to associate. 625 */ 626 void 627 ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 628 const uint8_t mac[IEEE80211_ADDR_LEN], int reason) 629 { 630 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 631 632 if (ss->ss_ops != NULL) { 633 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 634 "%s: reason %u", __func__, reason); 635 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 636 } 637 } 638 639 /* 640 * Iterate over the contents of the scan cache. 641 */ 642 void 643 ieee80211_scan_iterate(struct ieee80211vap *vap, 644 ieee80211_scan_iter_func *f, void *arg) 645 { 646 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 647 648 if (ss->ss_ops != NULL) 649 ss->ss_ops->scan_iterate(ss, f, arg); 650 } 651 652 /* 653 * Flush the contents of the scan cache. 654 */ 655 void 656 ieee80211_scan_flush(struct ieee80211vap *vap) 657 { 658 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 659 660 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 661 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 662 ss->ss_ops->scan_flush(ss); 663 } 664 } 665 666 /* 667 * Check the scan cache for an ap/channel to use; if that 668 * fails then kick off a new scan. 669 */ 670 struct ieee80211_channel * 671 ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 672 { 673 struct ieee80211_scan_state *ss = ic->ic_scan; 674 675 IEEE80211_LOCK_ASSERT(ic); 676 677 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 678 /* XXX printf? */ 679 return NULL; 680 } 681 if (ss->ss_ops->scan_pickchan == NULL) { 682 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 683 "%s: scan module does not support picking a channel, " 684 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 685 return NULL; 686 } 687 return ss->ss_ops->scan_pickchan(ss, flags); 688 } 689