wlan - Rip out all wlan locks part 1/2
[dragonfly.git] / sys / netproto / 802_11 / wlan / ieee80211_scan.c
CommitLineData
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1/*-
2 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * $FreeBSD: head/sys/net80211/ieee80211_scan.c 195618 2009-07-11 15:02:45Z rpaulo $
26 * $DragonFly$
27 */
28
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>
32176cfd 38
ccb4138a 39#include <sys/condvar.h>
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40#include <sys/socket.h>
41
42#include <net/if.h>
43#include <net/if_media.h>
44#include <net/ethernet.h>
45#include <net/route.h>
46
47#include <netproto/802_11/ieee80211_var.h>
48
49#include <net/bpf.h>
50
51struct scan_state {
52 struct ieee80211_scan_state base; /* public state */
53
54 u_int ss_iflags; /* flags used internally */
55#define ISCAN_MINDWELL 0x0001 /* min dwell time reached */
56#define ISCAN_DISCARD 0x0002 /* discard rx'd frames */
57#define ISCAN_CANCEL 0x0004 /* cancel current scan */
58#define ISCAN_ABORT 0x0008 /* end the scan immediately */
59 unsigned long ss_chanmindwell; /* min dwell on curchan */
60 unsigned long ss_scanend; /* time scan must stop */
61 u_int ss_duration; /* duration for next scan */
62 struct task ss_scan_task; /* scan execution */
63 struct cv ss_scan_cv; /* scan signal */
64 struct callout ss_scan_timer; /* scan timer */
65};
66#define SCAN_PRIVATE(ss) ((struct scan_state *) ss)
67
68/*
69 * Amount of time to go off-channel during a background
70 * scan. This value should be large enough to catch most
71 * ap's but short enough that we can return on-channel
72 * before our listen interval expires.
73 *
74 * XXX tunable
75 * XXX check against configured listen interval
76 */
77#define IEEE80211_SCAN_OFFCHANNEL msecs_to_ticks(150)
78
79/*
80 * Roaming-related defaults. RSSI thresholds are as returned by the
81 * driver (.5dBm). Transmit rate thresholds are IEEE rate codes (i.e
82 * .5M units) or MCS.
83 */
84/* rssi thresholds */
85#define ROAM_RSSI_11A_DEFAULT 14 /* 11a bss */
86#define ROAM_RSSI_11B_DEFAULT 14 /* 11b bss */
87#define ROAM_RSSI_11BONLY_DEFAULT 14 /* 11b-only bss */
88/* transmit rate thresholds */
89#define ROAM_RATE_11A_DEFAULT 2*12 /* 11a bss */
90#define ROAM_RATE_11B_DEFAULT 2*5 /* 11b bss */
91#define ROAM_RATE_11BONLY_DEFAULT 2*1 /* 11b-only bss */
92#define ROAM_RATE_HALF_DEFAULT 2*6 /* half-width 11a/g bss */
93#define ROAM_RATE_QUARTER_DEFAULT 2*3 /* quarter-width 11a/g bss */
94#define ROAM_MCS_11N_DEFAULT (1 | IEEE80211_RATE_MCS) /* 11n bss */
95
96static void scan_curchan(struct ieee80211_scan_state *, unsigned long);
97static void scan_mindwell(struct ieee80211_scan_state *);
98static void scan_signal(void *);
99static void scan_task(void *, int);
100
101MALLOC_DEFINE(M_80211_SCAN, "80211scan", "802.11 scan state");
102
103void
104ieee80211_scan_attach(struct ieee80211com *ic)
105{
106 struct scan_state *ss;
107
108 ss = (struct scan_state *) kmalloc(sizeof(struct scan_state),
fcaa651d 109 M_80211_SCAN, M_INTWAIT | M_ZERO);
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110 if (ss == NULL) {
111 ic->ic_scan = NULL;
112 return;
113 }
26c6f223 114 wlan_cv_init(&ss->ss_scan_cv, "scan");
22603758 115 callout_init(&ss->ss_scan_timer);
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116 TASK_INIT(&ss->ss_scan_task, 0, scan_task, ss);
117 ic->ic_scan = &ss->base;
118 ss->base.ss_ic = ic;
119
120 ic->ic_scan_curchan = scan_curchan;
121 ic->ic_scan_mindwell = scan_mindwell;
122}
123
124void
125ieee80211_scan_detach(struct ieee80211com *ic)
126{
127 struct ieee80211_scan_state *ss = ic->ic_scan;
128
129 if (ss != NULL) {
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130 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT;
131 scan_signal(ss);
32176cfd 132 ieee80211_draintask(ic, &SCAN_PRIVATE(ss)->ss_scan_task);
dfcf81fd 133 callout_stop(&SCAN_PRIVATE(ss)->ss_scan_timer);
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134 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0,
135 ("scan still running"));
136 if (ss->ss_ops != NULL) {
137 ss->ss_ops->scan_detach(ss);
138 ss->ss_ops = NULL;
139 }
140 ic->ic_scan = NULL;
141 kfree(SCAN_PRIVATE(ss), M_80211_SCAN);
142 }
143}
144
145static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = {
146 [IEEE80211_MODE_11A] = { .rssi = ROAM_RSSI_11A_DEFAULT,
147 .rate = ROAM_RATE_11A_DEFAULT },
148 [IEEE80211_MODE_11G] = { .rssi = ROAM_RSSI_11B_DEFAULT,
149 .rate = ROAM_RATE_11B_DEFAULT },
150 [IEEE80211_MODE_11B] = { .rssi = ROAM_RSSI_11BONLY_DEFAULT,
151 .rate = ROAM_RATE_11BONLY_DEFAULT },
152 [IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT,
153 .rate = ROAM_RATE_11A_DEFAULT },
154 [IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT,
155 .rate = ROAM_RATE_11A_DEFAULT },
156 [IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT,
157 .rate = ROAM_RATE_11A_DEFAULT },
158 [IEEE80211_MODE_HALF] = { .rssi = ROAM_RSSI_11A_DEFAULT,
159 .rate = ROAM_RATE_HALF_DEFAULT },
160 [IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT,
161 .rate = ROAM_RATE_QUARTER_DEFAULT },
162 [IEEE80211_MODE_11NA] = { .rssi = ROAM_RSSI_11A_DEFAULT,
163 .rate = ROAM_MCS_11N_DEFAULT },
164 [IEEE80211_MODE_11NG] = { .rssi = ROAM_RSSI_11B_DEFAULT,
165 .rate = ROAM_MCS_11N_DEFAULT },
166};
167
168void
169ieee80211_scan_vattach(struct ieee80211vap *vap)
170{
171 vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz;
172 vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz;
173 vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz;
174
175 vap->iv_roaming = IEEE80211_ROAMING_AUTO;
176 memcpy(vap->iv_roamparms, defroam, sizeof(defroam));
177}
178
179void
180ieee80211_scan_vdetach(struct ieee80211vap *vap)
181{
182 struct ieee80211com *ic = vap->iv_ic;
183 struct ieee80211_scan_state *ss;
184
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185 ss = ic->ic_scan;
186 if (ss != NULL && ss->ss_vap == vap) {
187 if (ic->ic_flags & IEEE80211_F_SCAN) {
188 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_ABORT;
189 scan_signal(ss);
190 }
191 if (ss->ss_ops != NULL) {
192 ss->ss_ops->scan_detach(ss);
193 ss->ss_ops = NULL;
194 }
195 ss->ss_vap = NULL;
196 }
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197}
198
199/*
200 * Simple-minded scanner module support.
201 */
202static const char *scan_modnames[IEEE80211_OPMODE_MAX] = {
203 "wlan_scan_sta", /* IEEE80211_M_IBSS */
204 "wlan_scan_sta", /* IEEE80211_M_STA */
205 "wlan_scan_wds", /* IEEE80211_M_WDS */
206 "wlan_scan_sta", /* IEEE80211_M_AHDEMO */
207 "wlan_scan_ap", /* IEEE80211_M_HOSTAP */
208 "wlan_scan_monitor", /* IEEE80211_M_MONITOR */
209 "wlan_scan_sta", /* IEEE80211_M_MBSS */
210};
211static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX];
212
213const struct ieee80211_scanner *
214ieee80211_scanner_get(enum ieee80211_opmode mode)
215{
216 if (mode >= IEEE80211_OPMODE_MAX)
217 return NULL;
218 if (scanners[mode] == NULL)
219 ieee80211_load_module(scan_modnames[mode]);
220 return scanners[mode];
221}
222
223void
224ieee80211_scanner_register(enum ieee80211_opmode mode,
225 const struct ieee80211_scanner *scan)
226{
227 if (mode >= IEEE80211_OPMODE_MAX)
228 return;
229 scanners[mode] = scan;
230}
231
232void
233ieee80211_scanner_unregister(enum ieee80211_opmode mode,
234 const struct ieee80211_scanner *scan)
235{
236 if (mode >= IEEE80211_OPMODE_MAX)
237 return;
238 if (scanners[mode] == scan)
239 scanners[mode] = NULL;
240}
241
242void
243ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan)
244{
245 int m;
246
247 for (m = 0; m < IEEE80211_OPMODE_MAX; m++)
248 if (scanners[m] == scan)
249 scanners[m] = NULL;
250}
251
252/*
253 * Update common scanner state to reflect the current
254 * operating mode. This is called when the state machine
255 * is transitioned to RUN state w/o scanning--e.g. when
256 * operating in monitor mode. The purpose of this is to
257 * ensure later callbacks find ss_ops set to properly
258 * reflect current operating mode.
259 */
260static void
261scan_update_locked(struct ieee80211vap *vap,
262 const struct ieee80211_scanner *scan)
263{
264 struct ieee80211com *ic = vap->iv_ic;
265 struct ieee80211_scan_state *ss = ic->ic_scan;
266
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267#ifdef IEEE80211_DEBUG
268 if (ss->ss_vap != vap || ss->ss_ops != scan) {
269 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
270 "%s: current scanner is <%s:%s>, switch to <%s:%s>\n",
271 __func__,
272 ss->ss_vap != NULL ?
273 ss->ss_vap->iv_ifp->if_xname : "none",
274 ss->ss_vap != NULL ?
275 ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none",
276 vap->iv_ifp->if_xname,
277 ieee80211_opmode_name[vap->iv_opmode]);
278 }
279#endif
280 ss->ss_vap = vap;
281 if (ss->ss_ops != scan) {
282 /*
283 * Switch scanners; detach old, attach new. Special
284 * case where a single scan module implements multiple
285 * policies by using different scan ops but a common
286 * core. We assume if the old and new attach methods
287 * are identical then it's ok to just change ss_ops
288 * and not flush the internal state of the module.
289 */
290 if (scan == NULL || ss->ss_ops == NULL ||
291 ss->ss_ops->scan_attach != scan->scan_attach) {
292 if (ss->ss_ops != NULL)
293 ss->ss_ops->scan_detach(ss);
294 if (scan != NULL && !scan->scan_attach(ss)) {
295 /* XXX attach failure */
296 /* XXX stat+msg */
297 scan = NULL;
298 }
299 }
300 ss->ss_ops = scan;
301 }
302}
303
304static char
305channel_type(const struct ieee80211_channel *c)
306{
307 if (IEEE80211_IS_CHAN_ST(c))
308 return 'S';
309 if (IEEE80211_IS_CHAN_108A(c))
310 return 'T';
311 if (IEEE80211_IS_CHAN_108G(c))
312 return 'G';
313 if (IEEE80211_IS_CHAN_HT(c))
314 return 'n';
315 if (IEEE80211_IS_CHAN_A(c))
316 return 'a';
317 if (IEEE80211_IS_CHAN_ANYG(c))
318 return 'g';
319 if (IEEE80211_IS_CHAN_B(c))
320 return 'b';
321 return 'f';
322}
323
324void
325ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss)
326{
327 struct ieee80211com *ic = ss->ss_ic;
328 const char *sep;
329 int i;
330
331 sep = "";
332 for (i = ss->ss_next; i < ss->ss_last; i++) {
333 const struct ieee80211_channel *c = ss->ss_chans[i];
334
335 kprintf("%s%u%c", sep, ieee80211_chan2ieee(ic, c),
336 channel_type(c));
337 sep = ", ";
338 }
339}
340
341#ifdef IEEE80211_DEBUG
342static void
343scan_dump(struct ieee80211_scan_state *ss)
344{
345 struct ieee80211vap *vap = ss->ss_vap;
346
347 if_printf(vap->iv_ifp, "scan set ");
348 ieee80211_scan_dump_channels(ss);
349 kprintf(" dwell min %lums max %lums\n",
350 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell));
351}
352#endif /* IEEE80211_DEBUG */
353
354static void
355copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss,
356 int nssid, const struct ieee80211_scan_ssid ssids[])
357{
358 if (nssid > IEEE80211_SCAN_MAX_SSID) {
359 /* XXX printf */
360 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
361 "%s: too many ssid %d, ignoring all of them\n",
362 __func__, nssid);
363 return;
364 }
365 memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0]));
366 ss->ss_nssid = nssid;
367}
368
369/*
370 * Start a scan unless one is already going.
371 */
372static int
373start_scan_locked(const struct ieee80211_scanner *scan,
374 struct ieee80211vap *vap, int flags, u_int duration,
375 u_int mindwell, u_int maxdwell,
376 u_int nssid, const struct ieee80211_scan_ssid ssids[])
377{
378 struct ieee80211com *ic = vap->iv_ic;
379 struct ieee80211_scan_state *ss = ic->ic_scan;
380
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381 if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
382 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
383 "%s: scan inhibited by pending channel change\n", __func__);
384 } else if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
385 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
386 "%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n"
387 , __func__
388 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"
389 , duration, mindwell, maxdwell
390 , ieee80211_phymode_name[vap->iv_des_mode]
391 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append"
392 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : ""
393 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : ""
394 , flags & IEEE80211_SCAN_NOBCAST ? ", nobcast" : ""
395 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : ""
396 , flags & IEEE80211_SCAN_ONCE ? ", once" : ""
397 );
398
399 scan_update_locked(vap, scan);
400 if (ss->ss_ops != NULL) {
401 if ((flags & IEEE80211_SCAN_NOSSID) == 0)
402 copy_ssid(vap, ss, nssid, ssids);
403
404 /* NB: top 4 bits for internal use */
405 ss->ss_flags = flags & 0xfff;
406 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE)
407 vap->iv_stats.is_scan_active++;
408 else
409 vap->iv_stats.is_scan_passive++;
410 if (flags & IEEE80211_SCAN_FLUSH)
411 ss->ss_ops->scan_flush(ss);
412
413 /* NB: flush frames rx'd before 1st channel change */
414 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD;
415 SCAN_PRIVATE(ss)->ss_duration = duration;
416 ss->ss_next = 0;
417 ss->ss_mindwell = mindwell;
418 ss->ss_maxdwell = maxdwell;
419 /* NB: scan_start must be before the scan runtask */
420 ss->ss_ops->scan_start(ss, vap);
421#ifdef IEEE80211_DEBUG
422 if (ieee80211_msg_scan(vap))
423 scan_dump(ss);
424#endif /* IEEE80211_DEBUG */
425 ic->ic_flags |= IEEE80211_F_SCAN;
426 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task);
427 }
428 } else {
429 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
430 "%s: %s scan already in progress\n", __func__,
431 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive");
432 }
433 return (ic->ic_flags & IEEE80211_F_SCAN);
434}
435
436/*
437 * Start a scan unless one is already going.
438 */
439int
440ieee80211_start_scan(struct ieee80211vap *vap, int flags,
441 u_int duration, u_int mindwell, u_int maxdwell,
442 u_int nssid, const struct ieee80211_scan_ssid ssids[])
443{
444 struct ieee80211com *ic = vap->iv_ic;
445 const struct ieee80211_scanner *scan;
446 int result;
447
e8361ca0 448 ic = vap->iv_ic;
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449 scan = ieee80211_scanner_get(vap->iv_opmode);
450 if (scan == NULL) {
451 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
452 "%s: no scanner support for %s mode\n",
453 __func__, ieee80211_opmode_name[vap->iv_opmode]);
454 /* XXX stat */
455 return 0;
456 }
457
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458 result = start_scan_locked(scan, vap, flags, duration,
459 mindwell, maxdwell, nssid, ssids);
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460
461 return result;
462}
463
464/*
465 * Check the scan cache for an ap/channel to use; if that
466 * fails then kick off a new scan.
467 */
468int
469ieee80211_check_scan(struct ieee80211vap *vap, int flags,
470 u_int duration, u_int mindwell, u_int maxdwell,
471 u_int nssid, const struct ieee80211_scan_ssid ssids[])
472{
473 struct ieee80211com *ic = vap->iv_ic;
474 struct ieee80211_scan_state *ss = ic->ic_scan;
475 const struct ieee80211_scanner *scan;
476 int result;
477
478 scan = ieee80211_scanner_get(vap->iv_opmode);
479 if (scan == NULL) {
480 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
481 "%s: no scanner support for %s mode\n",
482 __func__, vap->iv_opmode);
483 /* XXX stat */
484 return 0;
485 }
486
487 /*
488 * Check if there's a list of scan candidates already.
489 * XXX want more than the ap we're currently associated with
490 */
491
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492 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
493 "%s: %s scan, %s%s%s%s%s\n"
494 , __func__
495 , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"
496 , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append"
497 , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : ""
498 , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : ""
499 , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : ""
500 , flags & IEEE80211_SCAN_ONCE ? ", once" : ""
501 );
502
503 if (ss->ss_ops != scan) {
504 /* XXX re-use cache contents? e.g. adhoc<->sta */
505 flags |= IEEE80211_SCAN_FLUSH;
506 }
507 scan_update_locked(vap, scan);
508 if (ss->ss_ops != NULL) {
509 /* XXX verify ss_ops matches vap->iv_opmode */
510 if ((flags & IEEE80211_SCAN_NOSSID) == 0) {
511 /*
512 * Update the ssid list and mark flags so if
513 * we call start_scan it doesn't duplicate work.
514 */
515 copy_ssid(vap, ss, nssid, ssids);
516 flags |= IEEE80211_SCAN_NOSSID;
517 }
518 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
519 (flags & IEEE80211_SCAN_FLUSH) == 0 &&
520 time_before(ticks, ic->ic_lastscan + vap->iv_scanvalid)) {
521 /*
522 * We're not currently scanning and the cache is
523 * deemed hot enough to consult. Lock out others
524 * by marking IEEE80211_F_SCAN while we decide if
525 * something is already in the scan cache we can
526 * use. Also discard any frames that might come
527 * in while temporarily marked as scanning.
528 */
529 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD;
530 ic->ic_flags |= IEEE80211_F_SCAN;
531
532 /* NB: need to use supplied flags in check */
533 ss->ss_flags = flags & 0xff;
534 result = ss->ss_ops->scan_end(ss, vap);
535
536 ic->ic_flags &= ~IEEE80211_F_SCAN;
537 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_DISCARD;
538 if (result) {
539 ieee80211_notify_scan_done(vap);
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540 return 1;
541 }
542 }
543 }
544 result = start_scan_locked(scan, vap, flags, duration,
545 mindwell, maxdwell, nssid, ssids);
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546
547 return result;
548}
549
550/*
551 * Check the scan cache for an ap/channel to use; if that fails
552 * then kick off a scan using the current settings.
553 */
554int
555ieee80211_check_scan_current(struct ieee80211vap *vap)
556{
557 return ieee80211_check_scan(vap,
558 IEEE80211_SCAN_ACTIVE,
559 IEEE80211_SCAN_FOREVER, 0, 0,
560 vap->iv_des_nssid, vap->iv_des_ssid);
561}
562
563/*
564 * Restart a previous scan. If the previous scan completed
565 * then we start again using the existing channel list.
566 */
567int
568ieee80211_bg_scan(struct ieee80211vap *vap, int flags)
569{
570 struct ieee80211com *ic = vap->iv_ic;
571 struct ieee80211_scan_state *ss = ic->ic_scan;
572 const struct ieee80211_scanner *scan;
573
574 scan = ieee80211_scanner_get(vap->iv_opmode);
575 if (scan == NULL) {
576 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
577 "%s: no scanner support for %s mode\n",
578 __func__, vap->iv_opmode);
579 /* XXX stat */
580 return 0;
581 }
582
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583 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
584 u_int duration;
585 /*
586 * Go off-channel for a fixed interval that is large
587 * enough to catch most ap's but short enough that
588 * we can return on-channel before our listen interval
589 * expires.
590 */
591 duration = IEEE80211_SCAN_OFFCHANNEL;
592
593 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
594 "%s: %s scan, ticks %u duration %lu\n", __func__,
595 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive",
596 ticks, duration);
597
598 scan_update_locked(vap, scan);
599 if (ss->ss_ops != NULL) {
600 ss->ss_vap = vap;
601 /*
602 * A background scan does not select a new sta; it
603 * just refreshes the scan cache. Also, indicate
604 * the scan logic should follow the beacon schedule:
605 * we go off-channel and scan for a while, then
606 * return to the bss channel to receive a beacon,
607 * then go off-channel again. All during this time
608 * we notify the ap we're in power save mode. When
609 * the scan is complete we leave power save mode.
610 * If any beacon indicates there are frames pending
611 * for us then we drop out of power save mode
612 * (and background scan) automatically by way of the
613 * usual sta power save logic.
614 */
615 ss->ss_flags |= IEEE80211_SCAN_NOPICK
616 | IEEE80211_SCAN_BGSCAN
617 | flags
618 ;
619 /* if previous scan completed, restart */
620 if (ss->ss_next >= ss->ss_last) {
621 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE)
622 vap->iv_stats.is_scan_active++;
623 else
624 vap->iv_stats.is_scan_passive++;
625 /*
626 * NB: beware of the scan cache being flushed;
627 * if the channel list is empty use the
628 * scan_start method to populate it.
629 */
630 ss->ss_next = 0;
631 if (ss->ss_last != 0)
632 ss->ss_ops->scan_restart(ss, vap);
633 else {
634 ss->ss_ops->scan_start(ss, vap);
635#ifdef IEEE80211_DEBUG
636 if (ieee80211_msg_scan(vap))
637 scan_dump(ss);
638#endif /* IEEE80211_DEBUG */
639 }
640 }
641 /* NB: flush frames rx'd before 1st channel change */
642 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_DISCARD;
643 SCAN_PRIVATE(ss)->ss_duration = duration;
644 ss->ss_maxdwell = duration;
645 ic->ic_flags |= IEEE80211_F_SCAN;
646 ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN;
647 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task);
648 } else {
649 /* XXX msg+stat */
650 }
651 } else {
652 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
653 "%s: %s scan already in progress\n", __func__,
654 ss->ss_flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive");
655 }
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656
657 /* NB: racey, does it matter? */
658 return (ic->ic_flags & IEEE80211_F_SCAN);
659}
660
661/*
662 * Cancel any scan currently going on for the specified vap.
663 */
664void
665ieee80211_cancel_scan(struct ieee80211vap *vap)
666{
667 struct ieee80211com *ic = vap->iv_ic;
668 struct ieee80211_scan_state *ss = ic->ic_scan;
669
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670 if ((ic->ic_flags & IEEE80211_F_SCAN) &&
671 ss->ss_vap == vap &&
672 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) {
673 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
674 "%s: cancel %s scan\n", __func__,
675 ss->ss_flags & IEEE80211_SCAN_ACTIVE ?
676 "active" : "passive");
677
678 /* clear bg scan NOPICK and mark cancel request */
679 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
680 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL;
681 /* wake up the scan task */
682 scan_signal(ss);
683 }
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684}
685
686/*
687 * Cancel any scan currently going on.
688 */
689void
690ieee80211_cancel_anyscan(struct ieee80211vap *vap)
691{
692 struct ieee80211com *ic = vap->iv_ic;
693 struct ieee80211_scan_state *ss = ic->ic_scan;
694
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695 if ((ic->ic_flags & IEEE80211_F_SCAN) &&
696 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0) {
697 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
698 "%s: cancel %s scan\n", __func__,
699 ss->ss_flags & IEEE80211_SCAN_ACTIVE ?
700 "active" : "passive");
701
702 /* clear bg scan NOPICK and mark cancel request */
703 ss->ss_flags &= ~IEEE80211_SCAN_NOPICK;
704 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_CANCEL;
705 /* wake up the scan task */
706 scan_signal(ss);
707 }
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708}
709
710/*
711 * Public access to scan_next for drivers that manage
712 * scanning themselves (e.g. for firmware-based devices).
713 */
714void
715ieee80211_scan_next(struct ieee80211vap *vap)
716{
717 struct ieee80211com *ic = vap->iv_ic;
718 struct ieee80211_scan_state *ss = ic->ic_scan;
719
720 /* wake up the scan task */
32176cfd 721 scan_signal(ss);
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722}
723
724/*
725 * Public access to scan_next for drivers that are not able to scan single
726 * channels (e.g. for firmware-based devices).
727 */
728void
729ieee80211_scan_done(struct ieee80211vap *vap)
730{
731 struct ieee80211com *ic = vap->iv_ic;
732 struct ieee80211_scan_state *ss;
733
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734 ss = ic->ic_scan;
735 ss->ss_next = ss->ss_last; /* all channels are complete */
736 scan_signal(ss);
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737}
738
739/*
740 * Probe the curent channel, if allowed, while scanning.
741 * If the channel is not marked passive-only then send
742 * a probe request immediately. Otherwise mark state and
743 * listen for beacons on the channel; if we receive something
744 * then we'll transmit a probe request.
745 */
746void
747ieee80211_probe_curchan(struct ieee80211vap *vap, int force)
748{
749 struct ieee80211com *ic = vap->iv_ic;
750 struct ieee80211_scan_state *ss = ic->ic_scan;
751 struct ifnet *ifp = vap->iv_ifp;
752 int i;
753
754 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) {
755 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN;
756 return;
757 }
758 /*
759 * Send directed probe requests followed by any
760 * broadcast probe request.
761 * XXX remove dependence on ic/vap->iv_bss
762 */
763 for (i = 0; i < ss->ss_nssid; i++)
764 ieee80211_send_probereq(vap->iv_bss,
765 vap->iv_myaddr, ifp->if_broadcastaddr,
766 ifp->if_broadcastaddr,
767 ss->ss_ssid[i].ssid, ss->ss_ssid[i].len);
768 if ((ss->ss_flags & IEEE80211_SCAN_NOBCAST) == 0)
769 ieee80211_send_probereq(vap->iv_bss,
770 vap->iv_myaddr, ifp->if_broadcastaddr,
771 ifp->if_broadcastaddr,
772 "", 0);
773}
774
775/*
776 * Scan curchan. If this is an active scan and the channel
777 * is not marked passive then send probe request frame(s).
778 * Arrange for the channel change after maxdwell ticks.
779 */
780static void
781scan_curchan(struct ieee80211_scan_state *ss, unsigned long maxdwell)
782{
783 struct ieee80211vap *vap = ss->ss_vap;
784
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785 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE)
786 ieee80211_probe_curchan(vap, 0);
787 callout_reset(&SCAN_PRIVATE(ss)->ss_scan_timer,
788 maxdwell, scan_signal, ss);
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789}
790
791static void
792scan_signal(void *arg)
793{
794 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg;
795
26c6f223 796 wlan_cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv, 0);
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797}
798
799/*
800 * Handle mindwell requirements completed; initiate a channel
801 * change to the next channel asap.
802 */
803static void
804scan_mindwell(struct ieee80211_scan_state *ss)
805{
806 struct ieee80211com *ic = ss->ss_ic;
807
e8361ca0 808 ic = ss->ss_ic;
32176cfd 809 scan_signal(ss);
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810}
811
812static void
813scan_task(void *arg, int pending)
814{
815#define ISCAN_REP (ISCAN_MINDWELL | ISCAN_DISCARD)
816 struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg;
817 struct ieee80211vap *vap = ss->ss_vap;
818 struct ieee80211com *ic = ss->ss_ic;
819 struct ieee80211_channel *chan;
820 unsigned long maxdwell, scanend;
821 int scandone = 0;
822
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823 if (vap == NULL || (ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
824 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)) {
825 /* Cancelled before we started */
826 goto done;
827 }
828
829 if (ss->ss_next == ss->ss_last) {
830 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
831 "%s: no channels to scan\n", __func__);
832 goto done;
833 }
834
835 if (vap->iv_opmode == IEEE80211_M_STA &&
836 vap->iv_state == IEEE80211_S_RUN) {
837 if ((vap->iv_bss->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) {
838 /* Enable station power save mode */
839 ieee80211_sta_pwrsave(vap, 1);
840 /*
841 * Use an 1ms delay so the null data frame has a chance
26c6f223 842 * to go out. Minimum one tick.
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843 * XXX Should use M_TXCB mechanism to eliminate this.
844 */
26c6f223
MD
845 wlan_cv_timedwait(&SCAN_PRIVATE(ss)->ss_scan_cv,
846 hz / 1000 + 1);
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847 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)
848 goto done;
849 }
850 }
851
852 scanend = ticks + SCAN_PRIVATE(ss)->ss_duration;
32176cfd 853 ic->ic_scan_start(ic); /* notify driver */
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854
855 for (;;) {
856 scandone = (ss->ss_next >= ss->ss_last) ||
857 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0;
858 if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) ||
859 (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) ||
860 time_after(ticks + ss->ss_mindwell, scanend))
861 break;
862
863 chan = ss->ss_chans[ss->ss_next++];
864
865 /*
866 * Watch for truncation due to the scan end time.
867 */
868 if (time_after(ticks + ss->ss_maxdwell, scanend))
869 maxdwell = scanend - ticks;
870 else
871 maxdwell = ss->ss_maxdwell;
872
873 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
874 "%s: chan %3d%c -> %3d%c [%s, dwell min %lums max %lums]\n",
875 __func__,
876 ieee80211_chan2ieee(ic, ic->ic_curchan),
877 channel_type(ic->ic_curchan),
878 ieee80211_chan2ieee(ic, chan), channel_type(chan),
879 (ss->ss_flags & IEEE80211_SCAN_ACTIVE) &&
880 (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 ?
881 "active" : "passive",
882 ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(maxdwell));
883
884 /*
885 * Potentially change channel and phy mode.
886 */
887 ic->ic_curchan = chan;
888 ic->ic_rt = ieee80211_get_ratetable(chan);
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889 /*
890 * Perform the channel change and scan unlocked so the driver
891 * may sleep. Once set_channel returns the hardware has
892 * completed the channel change.
893 */
894 ic->ic_set_channel(ic);
895 ieee80211_radiotap_chan_change(ic);
896
897 /*
898 * Scan curchan. Drivers for "intelligent hardware"
899 * override ic_scan_curchan to tell the device to do
900 * the work. Otherwise we manage the work outselves;
901 * sending a probe request (as needed), and arming the
902 * timeout to switch channels after maxdwell ticks.
903 *
904 * scan_curchan should only pause for the time required to
905 * prepare/initiate the hardware for the scan (if at all), the
906 * below condvar is used to sleep for the channels dwell time
907 * and allows it to be signalled for abort.
908 */
909 ic->ic_scan_curchan(ss, maxdwell);
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910
911 SCAN_PRIVATE(ss)->ss_chanmindwell = ticks + ss->ss_mindwell;
912 /* clear mindwell lock and initial channel change flush */
913 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP;
914
915 if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT)))
916 continue;
917
918 /* Wait to be signalled to scan the next channel */
26c6f223 919 wlan_cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv);
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920 }
921 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)
922 goto done;
923
32176cfd 924 ic->ic_scan_end(ic); /* notify driver */
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925
926 /*
927 * Record scan complete time. Note that we also do
928 * this when canceled so any background scan will
929 * not be restarted for a while.
930 */
931 if (scandone)
932 ic->ic_lastscan = ticks;
933 /* return to the bss channel */
934 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
935 ic->ic_curchan != ic->ic_bsschan) {
936 ieee80211_setupcurchan(ic, ic->ic_bsschan);
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937 ic->ic_set_channel(ic);
938 ieee80211_radiotap_chan_change(ic);
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939 }
940 /* clear internal flags and any indication of a pick */
941 SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_REP;
942 ss->ss_flags &= ~IEEE80211_SCAN_GOTPICK;
943
944 /*
945 * If not canceled and scan completed, do post-processing.
946 * If the callback function returns 0, then it wants to
947 * continue/restart scanning. Unfortunately we needed to
948 * notify the driver to end the scan above to avoid having
949 * rx frames alter the scan candidate list.
950 */
951 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) == 0 &&
952 !ss->ss_ops->scan_end(ss, vap) &&
953 (ss->ss_flags & IEEE80211_SCAN_ONCE) == 0 &&
954 time_before(ticks + ss->ss_mindwell, scanend)) {
955 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
956 "%s: done, restart "
957 "[ticks %u, dwell min %lu scanend %lu]\n",
958 __func__,
959 ticks, ss->ss_mindwell, scanend);
960 ss->ss_next = 0; /* reset to begining */
961 if (ss->ss_flags & IEEE80211_SCAN_ACTIVE)
962 vap->iv_stats.is_scan_active++;
963 else
964 vap->iv_stats.is_scan_passive++;
965
966 ss->ss_ops->scan_restart(ss, vap); /* XXX? */
967 ieee80211_runtask(ic, &SCAN_PRIVATE(ss)->ss_scan_task);
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968 return;
969 }
970
971 /* past here, scandone is ``true'' if not in bg mode */
972 if ((ss->ss_flags & IEEE80211_SCAN_BGSCAN) == 0)
973 scandone = 1;
974
975 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
976 "%s: %s, [ticks %u, dwell min %lu scanend %lu]\n",
977 __func__, scandone ? "done" : "stopped",
978 ticks, ss->ss_mindwell, scanend);
979
980 /*
981 * Clear the SCAN bit first in case frames are
982 * pending on the station power save queue. If
983 * we defer this then the dispatch of the frames
984 * may generate a request to cancel scanning.
985 */
986done:
987 ic->ic_flags &= ~IEEE80211_F_SCAN;
988 /*
989 * Drop out of power save mode when a scan has
990 * completed. If this scan was prematurely terminated
991 * because it is a background scan then don't notify
992 * the ap; we'll either return to scanning after we
993 * receive the beacon frame or we'll drop out of power
994 * save mode because the beacon indicates we have frames
995 * waiting for us.
996 */
997 if (scandone) {
998 ieee80211_sta_pwrsave(vap, 0);
999 if (ss->ss_next >= ss->ss_last) {
1000 ieee80211_notify_scan_done(vap);
1001 ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN;
1002 }
1003 }
1004 SCAN_PRIVATE(ss)->ss_iflags &= ~(ISCAN_CANCEL|ISCAN_ABORT);
1005 ss->ss_flags &= ~(IEEE80211_SCAN_ONCE | IEEE80211_SCAN_PICK1ST);
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1006#undef ISCAN_REP
1007}
1008
1009#ifdef IEEE80211_DEBUG
1010static void
1011dump_country(const uint8_t *ie)
1012{
1013 const struct ieee80211_country_ie *cie =
1014 (const struct ieee80211_country_ie *) ie;
1015 int i, nbands, schan, nchan;
1016
1017 if (cie->len < 3) {
1018 kprintf(" <bogus country ie, len %d>", cie->len);
1019 return;
1020 }
1021 kprintf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]);
1022 nbands = (cie->len - 3) / sizeof(cie->band[0]);
1023 for (i = 0; i < nbands; i++) {
1024 schan = cie->band[i].schan;
1025 nchan = cie->band[i].nchan;
1026 if (nchan != 1)
1027 kprintf(" %u-%u,%u", schan, schan + nchan-1,
1028 cie->band[i].maxtxpwr);
1029 else
1030 kprintf(" %u,%u", schan, cie->band[i].maxtxpwr);
1031 }
1032 kprintf("]");
1033}
1034
1035static void
1036dump_probe_beacon(uint8_t subtype, int isnew,
1037 const uint8_t mac[IEEE80211_ADDR_LEN],
1038 const struct ieee80211_scanparams *sp, int rssi)
1039{
1040
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1041 kprintf("[%6D] %s%s on chan %u (bss chan %u) ",
1042 mac, ":", isnew ? "new " : "",
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1043 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT],
1044 sp->chan, sp->bchan);
1045 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]);
1046 kprintf(" rssi %d\n", rssi);
1047
1048 if (isnew) {
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1049 kprintf("[%6D] caps 0x%x bintval %u erp 0x%x",
1050 mac, ":", sp->capinfo, sp->bintval, sp->erp);
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1051 if (sp->country != NULL)
1052 dump_country(sp->country);
1053 kprintf("\n");
1054 }
1055}
1056#endif /* IEEE80211_DEBUG */
1057
1058/*
1059 * Process a beacon or probe response frame.
1060 */
1061void
1062ieee80211_add_scan(struct ieee80211vap *vap,
1063 const struct ieee80211_scanparams *sp,
1064 const struct ieee80211_frame *wh,
1065 int subtype, int rssi, int noise)
1066{
1067 struct ieee80211com *ic = vap->iv_ic;
1068 struct ieee80211_scan_state *ss = ic->ic_scan;
1069
1070 /* XXX locking */
1071 /*
1072 * Frames received during startup are discarded to avoid
1073 * using scan state setup on the initial entry to the timer
1074 * callback. This can occur because the device may enable
1075 * rx prior to our doing the initial channel change in the
1076 * timer routine.
1077 */
1078 if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_DISCARD)
1079 return;
1080#ifdef IEEE80211_DEBUG
1081 if (ieee80211_msg_scan(vap) && (ic->ic_flags & IEEE80211_F_SCAN))
1082 dump_probe_beacon(subtype, 1, wh->i_addr2, sp, rssi);
1083#endif
1084 if (ss->ss_ops != NULL &&
1085 ss->ss_ops->scan_add(ss, sp, wh, subtype, rssi, noise)) {
1086 /*
1087 * If we've reached the min dwell time terminate
1088 * the timer so we'll switch to the next channel.
1089 */
1090 if ((SCAN_PRIVATE(ss)->ss_iflags & ISCAN_MINDWELL) == 0 &&
1091 time_after_eq(ticks, SCAN_PRIVATE(ss)->ss_chanmindwell)) {
1092 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
1093 "%s: chan %3d%c min dwell met (%u > %lu)\n",
1094 __func__,
1095 ieee80211_chan2ieee(ic, ic->ic_curchan),
1096 channel_type(ic->ic_curchan),
1097 ticks, SCAN_PRIVATE(ss)->ss_chanmindwell);
1098 SCAN_PRIVATE(ss)->ss_iflags |= ISCAN_MINDWELL;
1099 /*
1100 * NB: trigger at next clock tick or wait for the
1101 * hardware.
1102 */
1103 ic->ic_scan_mindwell(ss);
1104 }
1105 }
1106}
1107
1108/*
1109 * Timeout/age scan cache entries; called from sta timeout
1110 * timer (XXX should be self-contained).
1111 */
1112void
1113ieee80211_scan_timeout(struct ieee80211com *ic)
1114{
1115 struct ieee80211_scan_state *ss = ic->ic_scan;
1116
1117 if (ss->ss_ops != NULL)
1118 ss->ss_ops->scan_age(ss);
1119}
1120
1121/*
1122 * Mark a scan cache entry after a successful associate.
1123 */
1124void
1125ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[])
1126{
1127 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan;
1128
1129 if (ss->ss_ops != NULL) {
1130 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN,
1131 mac, "%s", __func__);
1132 ss->ss_ops->scan_assoc_success(ss, mac);
1133 }
1134}
1135
1136/*
1137 * Demerit a scan cache entry after failing to associate.
1138 */
1139void
1140ieee80211_scan_assoc_fail(struct ieee80211vap *vap,
1141 const uint8_t mac[], int reason)
1142{
1143 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan;
1144
1145 if (ss->ss_ops != NULL) {
1146 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac,
1147 "%s: reason %u", __func__, reason);
1148 ss->ss_ops->scan_assoc_fail(ss, mac, reason);
1149 }
1150}
1151
1152/*
1153 * Iterate over the contents of the scan cache.
1154 */
1155void
1156ieee80211_scan_iterate(struct ieee80211vap *vap,
1157 ieee80211_scan_iter_func *f, void *arg)
1158{
1159 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan;
1160
1161 if (ss->ss_ops != NULL)
1162 ss->ss_ops->scan_iterate(ss, f, arg);
1163}
1164
1165/*
1166 * Flush the contents of the scan cache.
1167 */
1168void
1169ieee80211_scan_flush(struct ieee80211vap *vap)
1170{
1171 struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan;
1172
1173 if (ss->ss_ops != NULL && ss->ss_vap == vap) {
1174 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", __func__);
1175 ss->ss_ops->scan_flush(ss);
1176 }
1177}
1178
1179/*
1180 * Check the scan cache for an ap/channel to use; if that
1181 * fails then kick off a new scan.
1182 */
1183struct ieee80211_channel *
1184ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags)
1185{
1186 struct ieee80211_scan_state *ss = ic->ic_scan;
1187
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1188 if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) {
1189 /* XXX printf? */
1190 return NULL;
1191 }
1192 if (ss->ss_ops->scan_pickchan == NULL) {
1193 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN,
1194 "%s: scan module does not support picking a channel, "
1195 "opmode %s\n", __func__, ss->ss_vap->iv_opmode);
1196 return NULL;
1197 }
1198 return ss->ss_ops->scan_pickchan(ss, flags);
1199}