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 int m; 134 135 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz; 136 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz; 137 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz; 138 139 vap->iv_roaming = IEEE80211_ROAMING_AUTO; 140 141 memset(vap->iv_roamparms, 0, sizeof(vap->iv_roamparms)); 142 for (m = IEEE80211_MODE_AUTO + 1; m < IEEE80211_MODE_MAX; m++) { 143 if (isclr(ic->ic_modecaps, m)) 144 continue; 145 146 memcpy(&vap->iv_roamparms[m], &defroam[m], sizeof(defroam[m])); 147 } 148 149 ic->ic_scan_methods->sc_vattach(vap); 150 } 151 152 void 153 ieee80211_scan_vdetach(struct ieee80211vap *vap) 154 { 155 struct ieee80211com *ic = vap->iv_ic; 156 struct ieee80211_scan_state *ss; 157 158 IEEE80211_LOCK(ic); 159 ss = ic->ic_scan; 160 161 ic->ic_scan_methods->sc_vdetach(vap); 162 163 if (ss != NULL && ss->ss_vap == vap) { 164 if (ss->ss_ops != NULL) { 165 ss->ss_ops->scan_detach(ss); 166 ss->ss_ops = NULL; 167 } 168 ss->ss_vap = NULL; 169 } 170 IEEE80211_UNLOCK(ic); 171 } 172 173 /* 174 * Simple-minded scanner module support. 175 */ 176 static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 177 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 178 "wlan_scan_sta", /* IEEE80211_M_STA */ 179 "wlan_scan_wds", /* IEEE80211_M_WDS */ 180 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 181 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 182 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 183 "wlan_scan_sta", /* IEEE80211_M_MBSS */ 184 }; 185 static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 186 187 const struct ieee80211_scanner * 188 ieee80211_scanner_get(enum ieee80211_opmode mode) 189 { 190 if (mode >= IEEE80211_OPMODE_MAX) 191 return NULL; 192 if (scanners[mode] == NULL) 193 ieee80211_load_module(scan_modnames[mode]); 194 return scanners[mode]; 195 } 196 197 void 198 ieee80211_scanner_register(enum ieee80211_opmode mode, 199 const struct ieee80211_scanner *scan) 200 { 201 if (mode >= IEEE80211_OPMODE_MAX) 202 return; 203 scanners[mode] = scan; 204 } 205 206 void 207 ieee80211_scanner_unregister(enum ieee80211_opmode mode, 208 const struct ieee80211_scanner *scan) 209 { 210 if (mode >= IEEE80211_OPMODE_MAX) 211 return; 212 if (scanners[mode] == scan) 213 scanners[mode] = NULL; 214 } 215 216 void 217 ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 218 { 219 int m; 220 221 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 222 if (scanners[m] == scan) 223 scanners[m] = NULL; 224 } 225 226 /* 227 * Update common scanner state to reflect the current 228 * operating mode. This is called when the state machine 229 * is transitioned to RUN state w/o scanning--e.g. when 230 * operating in monitor mode. The purpose of this is to 231 * ensure later callbacks find ss_ops set to properly 232 * reflect current operating mode. 233 */ 234 void 235 ieee80211_scan_update_locked(struct ieee80211vap *vap, 236 const struct ieee80211_scanner *scan) 237 { 238 struct ieee80211com *ic = vap->iv_ic; 239 struct ieee80211_scan_state *ss = ic->ic_scan; 240 241 IEEE80211_LOCK_ASSERT(ic); 242 243 #ifdef IEEE80211_DEBUG 244 if (ss->ss_vap != vap || ss->ss_ops != scan) { 245 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 246 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 247 __func__, 248 ss->ss_vap != NULL ? 249 ss->ss_vap->iv_ifp->if_xname : "none", 250 ss->ss_vap != NULL ? 251 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 252 vap->iv_ifp->if_xname, 253 ieee80211_opmode_name[vap->iv_opmode]); 254 } 255 #endif 256 ss->ss_vap = vap; 257 if (ss->ss_ops != scan) { 258 /* 259 * Switch scanners; detach old, attach new. Special 260 * case where a single scan module implements multiple 261 * policies by using different scan ops but a common 262 * core. We assume if the old and new attach methods 263 * are identical then it's ok to just change ss_ops 264 * and not flush the internal state of the module. 265 */ 266 if (scan == NULL || ss->ss_ops == NULL || 267 ss->ss_ops->scan_attach != scan->scan_attach) { 268 if (ss->ss_ops != NULL) 269 ss->ss_ops->scan_detach(ss); 270 if (scan != NULL && !scan->scan_attach(ss)) { 271 /* XXX attach failure */ 272 /* XXX stat+msg */ 273 scan = NULL; 274 } 275 } 276 ss->ss_ops = scan; 277 } 278 } 279 280 void 281 ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 282 { 283 struct ieee80211com *ic = ss->ss_ic; 284 const char *sep; 285 int i; 286 287 sep = ""; 288 for (i = ss->ss_next; i < ss->ss_last; i++) { 289 const struct ieee80211_channel *c = ss->ss_chans[i]; 290 291 printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 292 ieee80211_channel_type_char(c)); 293 sep = ", "; 294 } 295 } 296 297 #ifdef IEEE80211_DEBUG 298 void 299 ieee80211_scan_dump(struct ieee80211_scan_state *ss) 300 { 301 struct ieee80211vap *vap = ss->ss_vap; 302 303 if_printf(vap->iv_ifp, "scan set "); 304 ieee80211_scan_dump_channels(ss); 305 printf(" dwell min %ums max %ums\n", 306 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 307 } 308 #endif /* IEEE80211_DEBUG */ 309 310 void 311 ieee80211_scan_copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 312 int nssid, const struct ieee80211_scan_ssid ssids[]) 313 { 314 if (nssid > IEEE80211_SCAN_MAX_SSID) { 315 /* XXX printf */ 316 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 317 "%s: too many ssid %d, ignoring all of them\n", 318 __func__, nssid); 319 return; 320 } 321 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 322 ss->ss_nssid = nssid; 323 } 324 325 /* 326 * Start a scan unless one is already going. 327 */ 328 int 329 ieee80211_start_scan(struct ieee80211vap *vap, int flags, 330 u_int duration, u_int mindwell, u_int maxdwell, 331 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 332 { 333 const struct ieee80211_scanner *scan; 334 struct ieee80211com *ic = vap->iv_ic; 335 336 scan = ieee80211_scanner_get(vap->iv_opmode); 337 if (scan == NULL) { 338 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 339 "%s: no scanner support for %s mode\n", 340 __func__, ieee80211_opmode_name[vap->iv_opmode]); 341 /* XXX stat */ 342 return 0; 343 } 344 345 return ic->ic_scan_methods->sc_start_scan(scan, vap, flags, duration, 346 mindwell, maxdwell, nssid, ssids); 347 } 348 349 /* 350 * Check the scan cache for an ap/channel to use; if that 351 * fails then kick off a new scan. 352 */ 353 int 354 ieee80211_check_scan(struct ieee80211vap *vap, int flags, 355 u_int duration, u_int mindwell, u_int maxdwell, 356 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 357 { 358 struct ieee80211com *ic = vap->iv_ic; 359 struct ieee80211_scan_state *ss = ic->ic_scan; 360 const struct ieee80211_scanner *scan; 361 int result; 362 363 scan = ieee80211_scanner_get(vap->iv_opmode); 364 if (scan == NULL) { 365 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 366 "%s: no scanner support for %s mode\n", 367 __func__, vap->iv_opmode); 368 /* XXX stat */ 369 return 0; 370 } 371 372 /* 373 * Check if there's a list of scan candidates already. 374 * XXX want more than the ap we're currently associated with 375 */ 376 377 IEEE80211_LOCK(ic); 378 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 379 "%s: %s scan, %s%s%s%s%s\n" 380 , __func__ 381 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 382 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 383 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 384 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 385 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 386 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 387 ); 388 389 if (ss->ss_ops != scan) { 390 /* XXX re-use cache contents? e.g. adhoc<->sta */ 391 flags |= IEEE80211_SCAN_FLUSH; 392 } 393 394 /* 395 * XXX TODO: separate things out a bit better. 396 */ 397 ieee80211_scan_update_locked(vap, scan); 398 399 result = ic->ic_scan_methods->sc_check_scan(scan, vap, flags, duration, 400 mindwell, maxdwell, nssid, ssids); 401 402 IEEE80211_UNLOCK(ic); 403 404 return (result); 405 } 406 407 /* 408 * Check the scan cache for an ap/channel to use; if that fails 409 * then kick off a scan using the current settings. 410 */ 411 int 412 ieee80211_check_scan_current(struct ieee80211vap *vap) 413 { 414 return ieee80211_check_scan(vap, 415 IEEE80211_SCAN_ACTIVE, 416 IEEE80211_SCAN_FOREVER, 0, 0, 417 vap->iv_des_nssid, vap->iv_des_ssid); 418 } 419 420 /* 421 * Restart a previous scan. If the previous scan completed 422 * then we start again using the existing channel list. 423 */ 424 int 425 ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 426 { 427 struct ieee80211com *ic = vap->iv_ic; 428 const struct ieee80211_scanner *scan; 429 430 // IEEE80211_UNLOCK_ASSERT(sc); 431 432 scan = ieee80211_scanner_get(vap->iv_opmode); 433 if (scan == NULL) { 434 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 435 "%s: no scanner support for %s mode\n", 436 __func__, vap->iv_opmode); 437 /* XXX stat */ 438 return 0; 439 } 440 441 /* 442 * XXX TODO: pull apart the bgscan logic into whatever 443 * belongs here and whatever belongs in the software 444 * scanner. 445 */ 446 return (ic->ic_scan_methods->sc_bg_scan(scan, vap, flags)); 447 } 448 449 /* 450 * Cancel any scan currently going on for the specified vap. 451 */ 452 void 453 ieee80211_cancel_scan(struct ieee80211vap *vap) 454 { 455 struct ieee80211com *ic = vap->iv_ic; 456 457 ic->ic_scan_methods->sc_cancel_scan(vap); 458 } 459 460 /* 461 * Cancel any scan currently going on. 462 * 463 * This is called during normal 802.11 data path to cancel 464 * a scan so a newly arrived normal data packet can be sent. 465 */ 466 void 467 ieee80211_cancel_anyscan(struct ieee80211vap *vap) 468 { 469 struct ieee80211com *ic = vap->iv_ic; 470 471 ic->ic_scan_methods->sc_cancel_anyscan(vap); 472 } 473 474 /* 475 * Manually switch to the next channel in the channel list. 476 * Provided for drivers that manage scanning themselves 477 * (e.g. for firmware-based devices). 478 */ 479 void 480 ieee80211_scan_next(struct ieee80211vap *vap) 481 { 482 struct ieee80211com *ic = vap->iv_ic; 483 484 ic->ic_scan_methods->sc_scan_next(vap); 485 } 486 487 /* 488 * Manually stop a scan that is currently running. 489 * Provided for drivers that are not able to scan single channels 490 * (e.g. for firmware-based devices). 491 */ 492 void 493 ieee80211_scan_done(struct ieee80211vap *vap) 494 { 495 struct ieee80211com *ic = vap->iv_ic; 496 struct ieee80211_scan_state *ss; 497 498 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__); 499 500 IEEE80211_LOCK(ic); 501 ss = ic->ic_scan; 502 ss->ss_next = ss->ss_last; /* all channels are complete */ 503 504 ic->ic_scan_methods->sc_scan_done(vap); 505 506 IEEE80211_UNLOCK(ic); 507 } 508 509 /* 510 * Probe the current channel, if allowed, while scanning. 511 * If the channel is not marked passive-only then send 512 * a probe request immediately. Otherwise mark state and 513 * listen for beacons on the channel; if we receive something 514 * then we'll transmit a probe request. 515 */ 516 void 517 ieee80211_probe_curchan(struct ieee80211vap *vap, int force) 518 { 519 struct ieee80211com *ic = vap->iv_ic; 520 521 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 522 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 523 return; 524 } 525 526 ic->ic_scan_methods->sc_scan_probe_curchan(vap, force); 527 } 528 529 #ifdef IEEE80211_DEBUG 530 static void 531 dump_country(const uint8_t *ie) 532 { 533 const struct ieee80211_country_ie *cie = 534 (const struct ieee80211_country_ie *) ie; 535 int i, nbands, schan, nchan; 536 537 if (cie->len < 3) { 538 printf(" <bogus country ie, len %d>", cie->len); 539 return; 540 } 541 printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 542 nbands = (cie->len - 3) / sizeof(cie->band[0]); 543 for (i = 0; i < nbands; i++) { 544 schan = cie->band[i].schan; 545 nchan = cie->band[i].nchan; 546 if (nchan != 1) 547 printf(" %u-%u,%u", schan, schan + nchan-1, 548 cie->band[i].maxtxpwr); 549 else 550 printf(" %u,%u", schan, cie->band[i].maxtxpwr); 551 } 552 printf("]"); 553 } 554 555 void 556 ieee80211_scan_dump_probe_beacon(uint8_t subtype, int isnew, 557 const uint8_t mac[IEEE80211_ADDR_LEN], 558 const struct ieee80211_scanparams *sp, int rssi) 559 { 560 561 printf("[%s] %s%s on chan %u (bss chan %u) ", 562 ether_sprintf(mac), isnew ? "new " : "", 563 ieee80211_mgt_subtype_name(subtype), sp->chan, sp->bchan); 564 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 565 printf(" rssi %d\n", rssi); 566 567 if (isnew) { 568 printf("[%s] caps 0x%x bintval %u erp 0x%x", 569 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 570 if (sp->country != NULL) 571 dump_country(sp->country); 572 printf("\n"); 573 } 574 } 575 #endif /* IEEE80211_DEBUG */ 576 577 /* 578 * Process a beacon or probe response frame. 579 */ 580 void 581 ieee80211_add_scan(struct ieee80211vap *vap, 582 struct ieee80211_channel *curchan, 583 const struct ieee80211_scanparams *sp, 584 const struct ieee80211_frame *wh, 585 int subtype, int rssi, int noise) 586 { 587 struct ieee80211com *ic = vap->iv_ic; 588 589 return (ic->ic_scan_methods->sc_add_scan(vap, curchan, sp, wh, subtype, 590 rssi, noise)); 591 } 592 593 /* 594 * Timeout/age scan cache entries; called from sta timeout 595 * timer (XXX should be self-contained). 596 */ 597 void 598 ieee80211_scan_timeout(struct ieee80211com *ic) 599 { 600 struct ieee80211_scan_state *ss = ic->ic_scan; 601 602 if (ss->ss_ops != NULL) 603 ss->ss_ops->scan_age(ss); 604 } 605 606 /* 607 * Mark a scan cache entry after a successful associate. 608 */ 609 void 610 ieee80211_scan_assoc_success(struct ieee80211vap *vap, 611 const uint8_t mac[IEEE80211_ADDR_LEN]) 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[IEEE80211_ADDR_LEN], 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