1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 /* 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 int m; 132 133 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz; 134 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz; 135 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz; 136 137 vap->iv_roaming = IEEE80211_ROAMING_AUTO; 138 139 memset(vap->iv_roamparms, 0, sizeof(vap->iv_roamparms)); 140 for (m = IEEE80211_MODE_AUTO + 1; m < IEEE80211_MODE_MAX; m++) { 141 if (isclr(ic->ic_modecaps, m)) 142 continue; 143 144 memcpy(&vap->iv_roamparms[m], &defroam[m], sizeof(defroam[m])); 145 } 146 147 ic->ic_scan_methods->sc_vattach(vap); 148 } 149 150 void 151 ieee80211_scan_vdetach(struct ieee80211vap *vap) 152 { 153 struct ieee80211com *ic = vap->iv_ic; 154 struct ieee80211_scan_state *ss; 155 156 IEEE80211_LOCK(ic); 157 ss = ic->ic_scan; 158 159 ic->ic_scan_methods->sc_vdetach(vap); 160 161 if (ss != NULL && ss->ss_vap == vap) { 162 if (ss->ss_ops != NULL) { 163 ss->ss_ops->scan_detach(ss); 164 ss->ss_ops = NULL; 165 } 166 ss->ss_vap = NULL; 167 } 168 IEEE80211_UNLOCK(ic); 169 } 170 171 /* 172 * Simple-minded scanner module support. 173 */ 174 static const char *scan_modnames[IEEE80211_OPMODE_MAX] = { 175 "wlan_scan_sta", /* IEEE80211_M_IBSS */ 176 "wlan_scan_sta", /* IEEE80211_M_STA */ 177 "wlan_scan_wds", /* IEEE80211_M_WDS */ 178 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */ 179 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */ 180 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */ 181 "wlan_scan_sta", /* IEEE80211_M_MBSS */ 182 }; 183 static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX]; 184 185 const struct ieee80211_scanner * 186 ieee80211_scanner_get(enum ieee80211_opmode mode) 187 { 188 if (mode >= IEEE80211_OPMODE_MAX) 189 return NULL; 190 if (scanners[mode] == NULL) 191 ieee80211_load_module(scan_modnames[mode]); 192 return scanners[mode]; 193 } 194 195 void 196 ieee80211_scanner_register(enum ieee80211_opmode mode, 197 const struct ieee80211_scanner *scan) 198 { 199 if (mode >= IEEE80211_OPMODE_MAX) 200 return; 201 scanners[mode] = scan; 202 } 203 204 void 205 ieee80211_scanner_unregister(enum ieee80211_opmode mode, 206 const struct ieee80211_scanner *scan) 207 { 208 if (mode >= IEEE80211_OPMODE_MAX) 209 return; 210 if (scanners[mode] == scan) 211 scanners[mode] = NULL; 212 } 213 214 void 215 ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan) 216 { 217 int m; 218 219 for (m = 0; m < IEEE80211_OPMODE_MAX; m++) 220 if (scanners[m] == scan) 221 scanners[m] = NULL; 222 } 223 224 /* 225 * Update common scanner state to reflect the current 226 * operating mode. This is called when the state machine 227 * is transitioned to RUN state w/o scanning--e.g. when 228 * operating in monitor mode. The purpose of this is to 229 * ensure later callbacks find ss_ops set to properly 230 * reflect current operating mode. 231 */ 232 void 233 ieee80211_scan_update_locked(struct ieee80211vap *vap, 234 const struct ieee80211_scanner *scan) 235 { 236 struct ieee80211com *ic = vap->iv_ic; 237 struct ieee80211_scan_state *ss = ic->ic_scan; 238 239 IEEE80211_LOCK_ASSERT(ic); 240 241 #ifdef IEEE80211_DEBUG 242 if (ss->ss_vap != vap || ss->ss_ops != scan) { 243 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 244 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n", 245 __func__, 246 ss->ss_vap != NULL ? 247 ieee80211_get_vap_ifname(ss->ss_vap) : "none", 248 ss->ss_vap != NULL ? 249 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none", 250 ieee80211_get_vap_ifname(vap), 251 ieee80211_opmode_name[vap->iv_opmode]); 252 } 253 #endif 254 ss->ss_vap = vap; 255 if (ss->ss_ops != scan) { 256 /* 257 * Switch scanners; detach old, attach new. Special 258 * case where a single scan module implements multiple 259 * policies by using different scan ops but a common 260 * core. We assume if the old and new attach methods 261 * are identical then it's ok to just change ss_ops 262 * and not flush the internal state of the module. 263 */ 264 if (scan == NULL || ss->ss_ops == NULL || 265 ss->ss_ops->scan_attach != scan->scan_attach) { 266 if (ss->ss_ops != NULL) 267 ss->ss_ops->scan_detach(ss); 268 if (scan != NULL && !scan->scan_attach(ss)) { 269 /* XXX attach failure */ 270 /* XXX stat+msg */ 271 scan = NULL; 272 } 273 } 274 ss->ss_ops = scan; 275 } 276 } 277 278 #ifdef IEEE80211_DEBUG 279 static void 280 ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss) 281 { 282 struct ieee80211com *ic = ss->ss_ic; 283 const char *sep; 284 int i; 285 286 sep = ""; 287 for (i = ss->ss_next; i < ss->ss_last; i++) { 288 const struct ieee80211_channel *c = ss->ss_chans[i]; 289 290 net80211_printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c), 291 ieee80211_channel_type_char(c)); 292 sep = ", "; 293 } 294 } 295 296 void 297 ieee80211_scan_dump(struct ieee80211_scan_state *ss) 298 { 299 struct ieee80211vap *vap = ss->ss_vap; 300 301 net80211_vap_printf(vap, "scan set "); 302 ieee80211_scan_dump_channels(ss); 303 net80211_vap_printf(vap, " dwell min %ums max %ums\n", 304 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell)); 305 } 306 #endif /* IEEE80211_DEBUG */ 307 308 void 309 ieee80211_scan_copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss, 310 int nssid, const struct ieee80211_scan_ssid ssids[]) 311 { 312 if (nssid > IEEE80211_SCAN_MAX_SSID) { 313 /* XXX printf */ 314 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 315 "%s: too many ssid %d, ignoring all of them\n", 316 __func__, nssid); 317 return; 318 } 319 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0])); 320 ss->ss_nssid = nssid; 321 } 322 323 /* 324 * Start a scan unless one is already going. 325 */ 326 int 327 ieee80211_start_scan(struct ieee80211vap *vap, int flags, 328 u_int duration, u_int mindwell, u_int maxdwell, 329 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 330 { 331 const struct ieee80211_scanner *scan; 332 struct ieee80211com *ic = vap->iv_ic; 333 334 scan = ieee80211_scanner_get(vap->iv_opmode); 335 if (scan == NULL) { 336 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 337 "%s: no scanner support for %s mode\n", 338 __func__, ieee80211_opmode_name[vap->iv_opmode]); 339 /* XXX stat */ 340 return 0; 341 } 342 343 return ic->ic_scan_methods->sc_start_scan(scan, vap, flags, duration, 344 mindwell, maxdwell, nssid, ssids); 345 } 346 347 /* 348 * Check the scan cache for an ap/channel to use; if that 349 * fails then kick off a new scan. 350 */ 351 int 352 ieee80211_check_scan(struct ieee80211vap *vap, int flags, 353 u_int duration, u_int mindwell, u_int maxdwell, 354 u_int nssid, const struct ieee80211_scan_ssid ssids[]) 355 { 356 struct ieee80211com *ic = vap->iv_ic; 357 struct ieee80211_scan_state *ss = ic->ic_scan; 358 const struct ieee80211_scanner *scan; 359 int result; 360 361 scan = ieee80211_scanner_get(vap->iv_opmode); 362 if (scan == NULL) { 363 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 364 "%s: no scanner support for %s mode\n", 365 __func__, vap->iv_opmode); 366 /* XXX stat */ 367 return 0; 368 } 369 370 /* 371 * Check if there's a list of scan candidates already. 372 * XXX want more than the ap we're currently associated with 373 */ 374 375 IEEE80211_LOCK(ic); 376 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 377 "%s: %s scan, %s%s%s%s%s\n" 378 , __func__ 379 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive" 380 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append" 381 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : "" 382 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : "" 383 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : "" 384 , flags & IEEE80211_SCAN_ONCE ? ", once" : "" 385 ); 386 387 if (ss->ss_ops != scan) { 388 /* XXX re-use cache contents? e.g. adhoc<->sta */ 389 flags |= IEEE80211_SCAN_FLUSH; 390 } 391 392 /* 393 * XXX TODO: separate things out a bit better. 394 */ 395 ieee80211_scan_update_locked(vap, scan); 396 397 result = ic->ic_scan_methods->sc_check_scan(scan, vap, flags, duration, 398 mindwell, maxdwell, nssid, ssids); 399 400 IEEE80211_UNLOCK(ic); 401 402 return (result); 403 } 404 405 /* 406 * Check the scan cache for an ap/channel to use; if that fails 407 * then kick off a scan using the current settings. 408 */ 409 int 410 ieee80211_check_scan_current(struct ieee80211vap *vap) 411 { 412 return ieee80211_check_scan(vap, 413 IEEE80211_SCAN_ACTIVE, 414 IEEE80211_SCAN_FOREVER, 0, 0, 415 vap->iv_des_nssid, vap->iv_des_ssid); 416 } 417 418 /* 419 * Restart a previous scan. If the previous scan completed 420 * then we start again using the existing channel list. 421 */ 422 int 423 ieee80211_bg_scan(struct ieee80211vap *vap, int flags) 424 { 425 struct ieee80211com *ic = vap->iv_ic; 426 const struct ieee80211_scanner *scan; 427 428 // IEEE80211_UNLOCK_ASSERT(sc); 429 430 /* 431 * If the driver has not announced BGSCAN capabilities 432 * or BGSCAN is disabled do not attempt to start a bg_scan. 433 * IEEE80211_F_BGSCAN only gets set if IEEE80211_C_BGSCAN 434 * was set by the driver, so no need to check for both here. 435 */ 436 if ((vap->iv_flags & IEEE80211_F_BGSCAN) == 0) { 437 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 438 "%s: BGSCAN not enabled; not starting bg_scan\n", 439 __func__); 440 return (0); 441 } 442 443 scan = ieee80211_scanner_get(vap->iv_opmode); 444 if (scan == NULL) { 445 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, 446 "%s: no scanner support for %s mode\n", 447 __func__, vap->iv_opmode); 448 /* XXX stat */ 449 return 0; 450 } 451 452 /* 453 * XXX TODO: pull apart the bgscan logic into whatever 454 * belongs here and whatever belongs in the software 455 * scanner. 456 */ 457 return (ic->ic_scan_methods->sc_bg_scan(scan, vap, flags)); 458 } 459 460 /* 461 * Cancel any scan currently going on for the specified vap. 462 */ 463 void 464 ieee80211_cancel_scan(struct ieee80211vap *vap) 465 { 466 struct ieee80211com *ic = vap->iv_ic; 467 468 ic->ic_scan_methods->sc_cancel_scan(vap); 469 } 470 471 /* 472 * Cancel any scan currently going on. 473 * 474 * This is called during normal 802.11 data path to cancel 475 * a scan so a newly arrived normal data packet can be sent. 476 */ 477 void 478 ieee80211_cancel_anyscan(struct ieee80211vap *vap) 479 { 480 struct ieee80211com *ic = vap->iv_ic; 481 482 ic->ic_scan_methods->sc_cancel_anyscan(vap); 483 } 484 485 /* 486 * Manually switch to the next channel in the channel list. 487 * Provided for drivers that manage scanning themselves 488 * (e.g. for firmware-based devices). 489 */ 490 void 491 ieee80211_scan_next(struct ieee80211vap *vap) 492 { 493 struct ieee80211com *ic = vap->iv_ic; 494 495 ic->ic_scan_methods->sc_scan_next(vap); 496 } 497 498 /* 499 * Manually stop a scan that is currently running. 500 * Provided for drivers that are not able to scan single channels 501 * (e.g. for firmware-based devices). 502 */ 503 void 504 ieee80211_scan_done(struct ieee80211vap *vap) 505 { 506 struct ieee80211com *ic = vap->iv_ic; 507 struct ieee80211_scan_state *ss; 508 509 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__); 510 511 IEEE80211_LOCK(ic); 512 ss = ic->ic_scan; 513 ss->ss_next = ss->ss_last; /* all channels are complete */ 514 515 ic->ic_scan_methods->sc_scan_done(vap); 516 517 IEEE80211_UNLOCK(ic); 518 } 519 520 /* 521 * Probe the current channel, if allowed, while scanning. 522 * If the channel is not marked passive-only then send 523 * a probe request immediately. Otherwise mark state and 524 * listen for beacons on the channel; if we receive something 525 * then we'll transmit a probe request. 526 */ 527 void 528 ieee80211_probe_curchan(struct ieee80211vap *vap, bool force) 529 { 530 struct ieee80211com *ic = vap->iv_ic; 531 532 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) { 533 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; 534 return; 535 } 536 537 ic->ic_scan_methods->sc_scan_probe_curchan(vap, force); 538 } 539 540 #ifdef IEEE80211_DEBUG 541 static void 542 dump_country(const uint8_t *ie) 543 { 544 const struct ieee80211_country_ie *cie = 545 (const struct ieee80211_country_ie *) ie; 546 int i, nbands, schan, nchan; 547 548 if (cie->len < 3) { 549 net80211_printf(" <bogus country ie, len %d>", cie->len); 550 return; 551 } 552 net80211_printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]); 553 nbands = (cie->len - 3) / sizeof(cie->band[0]); 554 for (i = 0; i < nbands; i++) { 555 schan = cie->band[i].schan; 556 nchan = cie->band[i].nchan; 557 if (nchan != 1) 558 net80211_printf(" %u-%u,%u", schan, schan + nchan-1, 559 cie->band[i].maxtxpwr); 560 else 561 net80211_printf(" %u,%u", schan, cie->band[i].maxtxpwr); 562 } 563 net80211_printf("]"); 564 } 565 566 void 567 ieee80211_scan_dump_probe_beacon(uint8_t subtype, int isnew, 568 const uint8_t mac[IEEE80211_ADDR_LEN], 569 const struct ieee80211_scanparams *sp, int rssi) 570 { 571 572 net80211_printf("[%s] %s%s on chan %u (bss chan %u) ", 573 ether_sprintf(mac), isnew ? "new " : "", 574 ieee80211_mgt_subtype_name(subtype), sp->chan, sp->bchan); 575 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]); 576 net80211_printf(" rssi %d\n", rssi); 577 578 if (isnew) { 579 net80211_printf("[%s] caps 0x%x bintval %u erp 0x%x", 580 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp); 581 if (sp->country != NULL) 582 dump_country(sp->country); 583 net80211_printf("\n"); 584 } 585 } 586 #endif /* IEEE80211_DEBUG */ 587 588 /* 589 * Process a beacon or probe response frame. 590 */ 591 void 592 ieee80211_add_scan(struct ieee80211vap *vap, 593 struct ieee80211_channel *curchan, 594 const struct ieee80211_scanparams *sp, 595 const struct ieee80211_frame *wh, 596 int subtype, int rssi, int noise) 597 { 598 struct ieee80211com *ic = vap->iv_ic; 599 600 return (ic->ic_scan_methods->sc_add_scan(vap, curchan, sp, wh, subtype, 601 rssi, noise)); 602 } 603 604 /* 605 * Timeout/age scan cache entries; called from sta timeout 606 * timer (XXX should be self-contained). 607 */ 608 void 609 ieee80211_scan_timeout(struct ieee80211com *ic) 610 { 611 struct ieee80211_scan_state *ss = ic->ic_scan; 612 613 if (ss->ss_ops != NULL) 614 ss->ss_ops->scan_age(ss); 615 } 616 617 /* 618 * Mark a scan cache entry after a successful associate. 619 */ 620 void 621 ieee80211_scan_assoc_success(struct ieee80211vap *vap, 622 const uint8_t mac[IEEE80211_ADDR_LEN]) 623 { 624 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 625 626 if (ss->ss_ops != NULL) { 627 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, 628 mac, "%s", __func__); 629 ss->ss_ops->scan_assoc_success(ss, mac); 630 } 631 } 632 633 /* 634 * Demerit a scan cache entry after failing to associate. 635 */ 636 void 637 ieee80211_scan_assoc_fail(struct ieee80211vap *vap, 638 const uint8_t mac[IEEE80211_ADDR_LEN], int reason) 639 { 640 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 641 642 if (ss->ss_ops != NULL) { 643 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac, 644 "%s: reason %u", __func__, reason); 645 ss->ss_ops->scan_assoc_fail(ss, mac, reason); 646 } 647 } 648 649 /* 650 * Iterate over the contents of the scan cache. 651 */ 652 void 653 ieee80211_scan_iterate(struct ieee80211vap *vap, 654 ieee80211_scan_iter_func *f, void *arg) 655 { 656 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 657 658 if (ss->ss_ops != NULL) 659 ss->ss_ops->scan_iterate(ss, f, arg); 660 } 661 662 /* 663 * Flush the contents of the scan cache. 664 */ 665 void 666 ieee80211_scan_flush(struct ieee80211vap *vap) 667 { 668 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan; 669 670 if (ss->ss_ops != NULL && ss->ss_vap == vap) { 671 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__); 672 ss->ss_ops->scan_flush(ss); 673 } 674 } 675 676 /* 677 * Check the scan cache for an ap/channel to use; if that 678 * fails then kick off a new scan. 679 */ 680 struct ieee80211_channel * 681 ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags) 682 { 683 struct ieee80211_scan_state *ss = ic->ic_scan; 684 685 IEEE80211_LOCK_ASSERT(ic); 686 687 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) { 688 /* XXX printf? */ 689 return NULL; 690 } 691 if (ss->ss_ops->scan_pickchan == NULL) { 692 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, 693 "%s: scan module does not support picking a channel, " 694 "opmode %s\n", __func__, ss->ss_vap->iv_opmode); 695 return NULL; 696 } 697 return ss->ss_ops->scan_pickchan(ss, flags); 698 } 699