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: releng/12.0/sys/net80211/ieee80211_scan.c 326272 2017-11-27 15:23:17Z pfg $"); 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 #ifdef __HAIKU__ 387 /* We never want to join if not explicitly looking for an SSID */ 388 if (nssid == 0 && (flags & IEEE80211_SCAN_NOJOIN) == 0) { 389 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 390 "%s: setting nojoin due to no configured ssid\n", __func__); 391 flags |= IEEE80211_SCAN_NOJOIN; 392 } 393 #endif 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, const uint8_t mac[]) 612 { 613 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 614 615 if (ss->ss_ops != NULL) { 616 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 617 mac, "%s", __func__); 618 ss->ss_ops->scan_assoc_success(ss, mac); 619 } 620 } 621 622 /* 623 * Demerit a scan cache entry after failing to associate. 624 */ 625 void 626 ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 627 const uint8_t mac[], int reason) 628 { 629 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 630 631 if (ss->ss_ops != NULL) { 632 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 633 "%s: reason %u", __func__, reason); 634 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 635 } 636 } 637 638 /* 639 * Iterate over the contents of the scan cache. 640 */ 641 void 642 ieee80211_scan_iterate(struct ieee80211vap *vap, 643 ieee80211_scan_iter_func *f, void *arg) 644 { 645 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 646 647 if (ss->ss_ops != NULL) 648 ss->ss_ops->scan_iterate(ss, f, arg); 649 } 650 651 /* 652 * Flush the contents of the scan cache. 653 */ 654 void 655 ieee80211_scan_flush(struct ieee80211vap *vap) 656 { 657 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 658 659 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 660 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 661 ss->ss_ops->scan_flush(ss); 662 } 663 } 664 665 /* 666 * Check the scan cache for an ap/channel to use; if that 667 * fails then kick off a new scan. 668 */ 669 struct ieee80211_channel * 670 ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 671 { 672 struct ieee80211_scan_state *ss = ic->ic_scan; 673 674 IEEE80211_LOCK_ASSERT(ic); 675 676 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 677 /* XXX printf? */ 678 return NULL; 679 } 680 if (ss->ss_ops->scan_pickchan == NULL) { 681 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 682 "%s: scan module does not support picking a channel, " 683 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 684 return NULL; 685 } 686 return ss->ss_ops->scan_pickchan(ss, flags); 687 } 688