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[linux-rt-nao.git] / net / mac80211 / scan.c
blobf5c7c3371929a5c41651bcbefa45771149b5c2d4
1 /*
2 * Scanning implementation
3 *
4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 /* TODO:
16 * order BSS list by RSSI(?) ("quality of AP")
17 * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
18 * SSID)
19 */
20
21 #include <linux/wireless.h>
22 #include <linux/if_arp.h>
23 #include <net/mac80211.h>
24 #include <net/iw_handler.h>
25
26 #include "ieee80211_i.h"
27 #include "mesh.h"
28
29 #define IEEE80211_PROBE_DELAY (HZ / 33)
30 #define IEEE80211_CHANNEL_TIME (HZ / 33)
31 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
32
33 void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
34 {
35 spin_lock_init(&local->bss_lock);
36 INIT_LIST_HEAD(&local->bss_list);
37 }
38
39 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
40 {
41 struct ieee80211_bss *bss, *tmp;
42
43 list_for_each_entry_safe(bss, tmp, &local->bss_list, list)
44 ieee80211_rx_bss_put(local, bss);
45 }
46
47 struct ieee80211_bss *
48 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
49 u8 *ssid, u8 ssid_len)
50 {
51 struct ieee80211_bss *bss;
52
53 spin_lock_bh(&local->bss_lock);
54 bss = local->bss_hash[STA_HASH(bssid)];
55 while (bss) {
56 if (!bss_mesh_cfg(bss) &&
57 !memcmp(bss->bssid, bssid, ETH_ALEN) &&
58 bss->freq == freq &&
59 bss->ssid_len == ssid_len &&
60 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
61 atomic_inc(&bss->users);
62 break;
63 }
64 bss = bss->hnext;
65 }
66 spin_unlock_bh(&local->bss_lock);
67 return bss;
68 }
69
70 /* Caller must hold local->bss_lock */
71 static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
72 struct ieee80211_bss *bss)
73 {
74 u8 hash_idx;
75
76 if (bss_mesh_cfg(bss))
77 hash_idx = mesh_id_hash(bss_mesh_id(bss),
78 bss_mesh_id_len(bss));
79 else
80 hash_idx = STA_HASH(bss->bssid);
81
82 bss->hnext = local->bss_hash[hash_idx];
83 local->bss_hash[hash_idx] = bss;
84 }
85
86 /* Caller must hold local->bss_lock */
87 static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
88 struct ieee80211_bss *bss)
89 {
90 struct ieee80211_bss *b, *prev = NULL;
91 b = local->bss_hash[STA_HASH(bss->bssid)];
92 while (b) {
93 if (b == bss) {
94 if (!prev)
95 local->bss_hash[STA_HASH(bss->bssid)] =
96 bss->hnext;
97 else
98 prev->hnext = bss->hnext;
99 break;
100 }
101 prev = b;
102 b = b->hnext;
103 }
104 }
105
106 struct ieee80211_bss *
107 ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
108 u8 *ssid, u8 ssid_len)
109 {
110 struct ieee80211_bss *bss;
111
112 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
113 if (!bss)
114 return NULL;
115 atomic_set(&bss->users, 2);
116 memcpy(bss->bssid, bssid, ETH_ALEN);
117 bss->freq = freq;
118 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
119 memcpy(bss->ssid, ssid, ssid_len);
120 bss->ssid_len = ssid_len;
121 }
122
123 spin_lock_bh(&local->bss_lock);
124 /* TODO: order by RSSI? */
125 list_add_tail(&bss->list, &local->bss_list);
126 __ieee80211_rx_bss_hash_add(local, bss);
127 spin_unlock_bh(&local->bss_lock);
128 return bss;
129 }
130
131 #ifdef CONFIG_MAC80211_MESH
132 static struct ieee80211_bss *
133 ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
134 u8 *mesh_cfg, int freq)
135 {
136 struct ieee80211_bss *bss;
137
138 spin_lock_bh(&local->bss_lock);
139 bss = local->bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
140 while (bss) {
141 if (bss_mesh_cfg(bss) &&
142 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
143 bss->freq == freq &&
144 mesh_id_len == bss->mesh_id_len &&
145 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
146 mesh_id_len))) {
147 atomic_inc(&bss->users);
148 break;
149 }
150 bss = bss->hnext;
151 }
152 spin_unlock_bh(&local->bss_lock);
153 return bss;
154 }
155
156 static struct ieee80211_bss *
157 ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
158 u8 *mesh_cfg, int mesh_config_len, int freq)
159 {
160 struct ieee80211_bss *bss;
161
162 if (mesh_config_len != IEEE80211_MESH_CONFIG_LEN)
163 return NULL;
164
165 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
166 if (!bss)
167 return NULL;
168
169 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
170 if (!bss->mesh_cfg) {
171 kfree(bss);
172 return NULL;
173 }
174
175 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
176 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
177 if (!bss->mesh_id) {
178 kfree(bss->mesh_cfg);
179 kfree(bss);
180 return NULL;
181 }
182 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
183 }
184
185 atomic_set(&bss->users, 2);
186 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
187 bss->mesh_id_len = mesh_id_len;
188 bss->freq = freq;
189 spin_lock_bh(&local->bss_lock);
190 /* TODO: order by RSSI? */
191 list_add_tail(&bss->list, &local->bss_list);
192 __ieee80211_rx_bss_hash_add(local, bss);
193 spin_unlock_bh(&local->bss_lock);
194 return bss;
195 }
196 #endif
197
198 static void ieee80211_rx_bss_free(struct ieee80211_bss *bss)
199 {
200 kfree(bss->ies);
201 kfree(bss_mesh_id(bss));
202 kfree(bss_mesh_cfg(bss));
203 kfree(bss);
204 }
205
206 void ieee80211_rx_bss_put(struct ieee80211_local *local,
207 struct ieee80211_bss *bss)
208 {
209 local_bh_disable();
210 if (!atomic_dec_and_lock(&bss->users, &local->bss_lock)) {
211 local_bh_enable();
212 return;
213 }
214
215 __ieee80211_rx_bss_hash_del(local, bss);
216 list_del(&bss->list);
217 spin_unlock_bh(&local->bss_lock);
218 ieee80211_rx_bss_free(bss);
219 }
220
221 struct ieee80211_bss *
222 ieee80211_bss_info_update(struct ieee80211_local *local,
223 struct ieee80211_rx_status *rx_status,
224 struct ieee80211_mgmt *mgmt,
225 size_t len,
226 struct ieee802_11_elems *elems,
227 int freq, bool beacon)
228 {
229 struct ieee80211_bss *bss;
230 int clen;
231
232 #ifdef CONFIG_MAC80211_MESH
233 if (elems->mesh_config)
234 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
235 elems->mesh_id_len, elems->mesh_config, freq);
236 else
237 #endif
238 bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
239 elems->ssid, elems->ssid_len);
240 if (!bss) {
241 #ifdef CONFIG_MAC80211_MESH
242 if (elems->mesh_config)
243 bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
244 elems->mesh_id_len, elems->mesh_config,
245 elems->mesh_config_len, freq);
246 else
247 #endif
248 bss = ieee80211_rx_bss_add(local, mgmt->bssid, freq,
249 elems->ssid, elems->ssid_len);
250 if (!bss)
251 return NULL;
252 } else {
253 #if 0
254 /* TODO: order by RSSI? */
255 spin_lock_bh(&local->bss_lock);
256 list_move_tail(&bss->list, &local->bss_list);
257 spin_unlock_bh(&local->bss_lock);
258 #endif
259 }
260
261 /* save the ERP value so that it is available at association time */
262 if (elems->erp_info && elems->erp_info_len >= 1) {
263 bss->erp_value = elems->erp_info[0];
264 bss->has_erp_value = 1;
265 }
266
267 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
268 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
269
270 if (elems->tim) {
271 struct ieee80211_tim_ie *tim_ie =
272 (struct ieee80211_tim_ie *)elems->tim;
273 bss->dtim_period = tim_ie->dtim_period;
274 }
275
276 /* set default value for buggy APs */
277 if (!elems->tim || bss->dtim_period == 0)
278 bss->dtim_period = 1;
279
280 bss->supp_rates_len = 0;
281 if (elems->supp_rates) {
282 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
283 if (clen > elems->supp_rates_len)
284 clen = elems->supp_rates_len;
285 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
286 clen);
287 bss->supp_rates_len += clen;
288 }
289 if (elems->ext_supp_rates) {
290 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
291 if (clen > elems->ext_supp_rates_len)
292 clen = elems->ext_supp_rates_len;
293 memcpy(&bss->supp_rates[bss->supp_rates_len],
294 elems->ext_supp_rates, clen);
295 bss->supp_rates_len += clen;
296 }
297
298 bss->band = rx_status->band;
299
300 bss->timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
301 bss->last_update = jiffies;
302 bss->signal = rx_status->signal;
303 bss->noise = rx_status->noise;
304 bss->qual = rx_status->qual;
305 bss->wmm_used = elems->wmm_param || elems->wmm_info;
306
307 if (!beacon)
308 bss->last_probe_resp = jiffies;
309
310 /*
311 * For probe responses, or if we don't have any information yet,
312 * use the IEs from the beacon.
313 */
314 if (!bss->ies || !beacon) {
315 if (bss->ies == NULL || bss->ies_len < elems->total_len) {
316 kfree(bss->ies);
317 bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
318 }
319 if (bss->ies) {
320 memcpy(bss->ies, elems->ie_start, elems->total_len);
321 bss->ies_len = elems->total_len;
322 } else
323 bss->ies_len = 0;
324 }
325
326 return bss;
327 }
328
329 ieee80211_rx_result
330 ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
331 struct ieee80211_rx_status *rx_status)
332 {
333 struct ieee80211_mgmt *mgmt;
334 struct ieee80211_bss *bss;
335 u8 *elements;
336 struct ieee80211_channel *channel;
337 size_t baselen;
338 int freq;
339 __le16 fc;
340 bool presp, beacon = false;
341 struct ieee802_11_elems elems;
342
343 if (skb->len < 2)
344 return RX_DROP_UNUSABLE;
345
346 mgmt = (struct ieee80211_mgmt *) skb->data;
347 fc = mgmt->frame_control;
348
349 if (ieee80211_is_ctl(fc))
350 return RX_CONTINUE;
351
352 if (skb->len < 24)
353 return RX_DROP_MONITOR;
354
355 presp = ieee80211_is_probe_resp(fc);
356 if (presp) {
357 /* ignore ProbeResp to foreign address */
358 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
359 return RX_DROP_MONITOR;
360
361 presp = true;
362 elements = mgmt->u.probe_resp.variable;
363 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
364 } else {
365 beacon = ieee80211_is_beacon(fc);
366 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
367 elements = mgmt->u.beacon.variable;
368 }
369
370 if (!presp && !beacon)
371 return RX_CONTINUE;
372
373 if (baselen > skb->len)
374 return RX_DROP_MONITOR;
375
376 ieee802_11_parse_elems(elements, skb->len - baselen, &elems);
377
378 if (elems.ds_params && elems.ds_params_len == 1)
379 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
380 else
381 freq = rx_status->freq;
382
383 channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
384
385 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
386 return RX_DROP_MONITOR;
387
388 bss = ieee80211_bss_info_update(sdata->local, rx_status,
389 mgmt, skb->len, &elems,
390 freq, beacon);
391 if (bss)
392 ieee80211_rx_bss_put(sdata->local, bss);
393
394 dev_kfree_skb(skb);
395 return RX_QUEUED;
396 }
397
398 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
399 struct ieee80211_sub_if_data *sdata,
400 int powersave)
401 {
402 struct sk_buff *skb;
403 struct ieee80211_hdr *nullfunc;
404 __le16 fc;
405
406 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
407 if (!skb) {
408 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
409 "frame\n", sdata->dev->name);
410 return;
411 }
412 skb_reserve(skb, local->hw.extra_tx_headroom);
413
414 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
415 memset(nullfunc, 0, 24);
416 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
417 IEEE80211_FCTL_TODS);
418 if (powersave)
419 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
420 nullfunc->frame_control = fc;
421 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
422 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
423 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
424
425 ieee80211_tx_skb(sdata, skb, 0);
426 }
427
428 void ieee80211_scan_completed(struct ieee80211_hw *hw)
429 {
430 struct ieee80211_local *local = hw_to_local(hw);
431 struct ieee80211_sub_if_data *sdata;
432 union iwreq_data wrqu;
433
434 if (WARN_ON(!local->hw_scanning && !local->sw_scanning))
435 return;
436
437 local->last_scan_completed = jiffies;
438 memset(&wrqu, 0, sizeof(wrqu));
439
440 /*
441 * local->scan_sdata could have been NULLed by the interface
442 * down code in case we were scanning on an interface that is
443 * being taken down.
444 */
445 sdata = local->scan_sdata;
446 if (sdata)
447 wireless_send_event(sdata->dev, SIOCGIWSCAN, &wrqu, NULL);
448
449 if (local->hw_scanning) {
450 local->hw_scanning = false;
451 /*
452 * Somebody might have requested channel change during scan
453 * that we won't have acted upon, try now. ieee80211_hw_config
454 * will set the flag based on actual changes.
455 */
456 ieee80211_hw_config(local, 0);
457 goto done;
458 }
459
460 local->sw_scanning = false;
461 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
462
463 netif_tx_lock_bh(local->mdev);
464 netif_addr_lock(local->mdev);
465 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
466 local->ops->configure_filter(local_to_hw(local),
467 FIF_BCN_PRBRESP_PROMISC,
468 &local->filter_flags,
469 local->mdev->mc_count,
470 local->mdev->mc_list);
471
472 netif_addr_unlock(local->mdev);
473 netif_tx_unlock_bh(local->mdev);
474
475 rcu_read_lock();
476 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
477 /* Tell AP we're back */
478 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
479 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
480 ieee80211_send_nullfunc(local, sdata, 0);
481 netif_tx_wake_all_queues(sdata->dev);
482 }
483 } else
484 netif_tx_wake_all_queues(sdata->dev);
485 }
486 rcu_read_unlock();
487
488 done:
489 ieee80211_mlme_notify_scan_completed(local);
490 ieee80211_mesh_notify_scan_completed(local);
491 }
492 EXPORT_SYMBOL(ieee80211_scan_completed);
493
494
495 void ieee80211_scan_work(struct work_struct *work)
496 {
497 struct ieee80211_local *local =
498 container_of(work, struct ieee80211_local, scan_work.work);
499 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
500 struct ieee80211_supported_band *sband;
501 struct ieee80211_channel *chan;
502 int skip;
503 unsigned long next_delay = 0;
504
505 /*
506 * Avoid re-scheduling when the sdata is going away.
507 */
508 if (!netif_running(sdata->dev))
509 return;
510
511 switch (local->scan_state) {
512 case SCAN_SET_CHANNEL:
513 /*
514 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
515 * after we successfully scanned the last channel of the last
516 * band (and the last band is supported by the hw)
517 */
518 if (local->scan_band < IEEE80211_NUM_BANDS)
519 sband = local->hw.wiphy->bands[local->scan_band];
520 else
521 sband = NULL;
522
523 /*
524 * If we are at an unsupported band and have more bands
525 * left to scan, advance to the next supported one.
526 */
527 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
528 local->scan_band++;
529 sband = local->hw.wiphy->bands[local->scan_band];
530 local->scan_channel_idx = 0;
531 }
532
533 /* if no more bands/channels left, complete scan */
534 if (!sband || local->scan_channel_idx >= sband->n_channels) {
535 ieee80211_scan_completed(local_to_hw(local));
536 return;
537 }
538 skip = 0;
539 chan = &sband->channels[local->scan_channel_idx];
540
541 if (chan->flags & IEEE80211_CHAN_DISABLED ||
542 (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
543 chan->flags & IEEE80211_CHAN_NO_IBSS))
544 skip = 1;
545
546 if (!skip) {
547 local->scan_channel = chan;
548 if (ieee80211_hw_config(local,
549 IEEE80211_CONF_CHANGE_CHANNEL))
550 skip = 1;
551 }
552
553 /* advance state machine to next channel/band */
554 local->scan_channel_idx++;
555 if (local->scan_channel_idx >= sband->n_channels) {
556 /*
557 * scan_band may end up == IEEE80211_NUM_BANDS, but
558 * we'll catch that case above and complete the scan
559 * if that is the case.
560 */
561 local->scan_band++;
562 local->scan_channel_idx = 0;
563 }
564
565 if (skip)
566 break;
567
568 next_delay = IEEE80211_PROBE_DELAY +
569 usecs_to_jiffies(local->hw.channel_change_time);
570 local->scan_state = SCAN_SEND_PROBE;
571 break;
572 case SCAN_SEND_PROBE:
573 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
574 local->scan_state = SCAN_SET_CHANNEL;
575
576 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
577 break;
578 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
579 local->scan_ssid_len);
580 next_delay = IEEE80211_CHANNEL_TIME;
581 break;
582 }
583
584 queue_delayed_work(local->hw.workqueue, &local->scan_work,
585 next_delay);
586 }
587
588
589 int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
590 u8 *ssid, size_t ssid_len)
591 {
592 struct ieee80211_local *local = scan_sdata->local;
593 struct ieee80211_sub_if_data *sdata;
594
595 if (ssid_len > IEEE80211_MAX_SSID_LEN)
596 return -EINVAL;
597
598 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
599 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
600 * BSSID: MACAddress
601 * SSID
602 * ScanType: ACTIVE, PASSIVE
603 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
604 * a Probe frame during active scanning
605 * ChannelList
606 * MinChannelTime (>= ProbeDelay), in TU
607 * MaxChannelTime: (>= MinChannelTime), in TU
608 */
609
610 /* MLME-SCAN.confirm
611 * BSSDescriptionSet
612 * ResultCode: SUCCESS, INVALID_PARAMETERS
613 */
614
615 if (local->sw_scanning || local->hw_scanning) {
616 if (local->scan_sdata == scan_sdata)
617 return 0;
618 return -EBUSY;
619 }
620
621 if (local->ops->hw_scan) {
622 int rc;
623
624 local->hw_scanning = true;
625 rc = local->ops->hw_scan(local_to_hw(local), ssid, ssid_len);
626 if (rc) {
627 local->hw_scanning = false;
628 return rc;
629 }
630 local->scan_sdata = scan_sdata;
631 return 0;
632 }
633
634 local->sw_scanning = true;
635
636 rcu_read_lock();
637 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
638 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
639 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
640 netif_tx_stop_all_queues(sdata->dev);
641 ieee80211_send_nullfunc(local, sdata, 1);
642 }
643 } else
644 netif_tx_stop_all_queues(sdata->dev);
645 }
646 rcu_read_unlock();
647
648 if (ssid) {
649 local->scan_ssid_len = ssid_len;
650 memcpy(local->scan_ssid, ssid, ssid_len);
651 } else
652 local->scan_ssid_len = 0;
653 local->scan_state = SCAN_SET_CHANNEL;
654 local->scan_channel_idx = 0;
655 local->scan_band = IEEE80211_BAND_2GHZ;
656 local->scan_sdata = scan_sdata;
657
658 netif_addr_lock_bh(local->mdev);
659 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
660 local->ops->configure_filter(local_to_hw(local),
661 FIF_BCN_PRBRESP_PROMISC,
662 &local->filter_flags,
663 local->mdev->mc_count,
664 local->mdev->mc_list);
665 netif_addr_unlock_bh(local->mdev);
666
667 /* TODO: start scan as soon as all nullfunc frames are ACKed */
668 queue_delayed_work(local->hw.workqueue, &local->scan_work,
669 IEEE80211_CHANNEL_TIME);
670
671 return 0;
672 }
673
674
675 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
676 u8 *ssid, size_t ssid_len)
677 {
678 struct ieee80211_local *local = sdata->local;
679 struct ieee80211_if_sta *ifsta;
680
681 if (sdata->vif.type != NL80211_IFTYPE_STATION)
682 return ieee80211_start_scan(sdata, ssid, ssid_len);
683
684 /*
685 * STA has a state machine that might need to defer scanning
686 * while it's trying to associate/authenticate, therefore we
687 * queue it up to the state machine in that case.
688 */
689
690 if (local->sw_scanning || local->hw_scanning) {
691 if (local->scan_sdata == sdata)
692 return 0;
693 return -EBUSY;
694 }
695
696 ifsta = &sdata->u.sta;
697
698 ifsta->scan_ssid_len = ssid_len;
699 if (ssid_len)
700 memcpy(ifsta->scan_ssid, ssid, ssid_len);
701 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
702 queue_work(local->hw.workqueue, &ifsta->work);
703
704 return 0;
705 }
706
707
708 static void ieee80211_scan_add_ies(struct iw_request_info *info,
709 struct ieee80211_bss *bss,
710 char **current_ev, char *end_buf)
711 {
712 u8 *pos, *end, *next;
713 struct iw_event iwe;
714
715 if (bss == NULL || bss->ies == NULL)
716 return;
717
718 /*
719 * If needed, fragment the IEs buffer (at IE boundaries) into short
720 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
721 */
722 pos = bss->ies;
723 end = pos + bss->ies_len;
724
725 while (end - pos > IW_GENERIC_IE_MAX) {
726 next = pos + 2 + pos[1];
727 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
728 next = next + 2 + next[1];
729
730 memset(&iwe, 0, sizeof(iwe));
731 iwe.cmd = IWEVGENIE;
732 iwe.u.data.length = next - pos;
733 *current_ev = iwe_stream_add_point(info, *current_ev,
734 end_buf, &iwe, pos);
735
736 pos = next;
737 }
738
739 if (end > pos) {
740 memset(&iwe, 0, sizeof(iwe));
741 iwe.cmd = IWEVGENIE;
742 iwe.u.data.length = end - pos;
743 *current_ev = iwe_stream_add_point(info, *current_ev,
744 end_buf, &iwe, pos);
745 }
746 }
747
748
749 static char *
750 ieee80211_scan_result(struct ieee80211_local *local,
751 struct iw_request_info *info,
752 struct ieee80211_bss *bss,
753 char *current_ev, char *end_buf)
754 {
755 struct iw_event iwe;
756 char *buf;
757
758 if (time_after(jiffies,
759 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
760 return current_ev;
761
762 memset(&iwe, 0, sizeof(iwe));
763 iwe.cmd = SIOCGIWAP;
764 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
765 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
766 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
767 IW_EV_ADDR_LEN);
768
769 memset(&iwe, 0, sizeof(iwe));
770 iwe.cmd = SIOCGIWESSID;
771 if (bss_mesh_cfg(bss)) {
772 iwe.u.data.length = bss_mesh_id_len(bss);
773 iwe.u.data.flags = 1;
774 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
775 &iwe, bss_mesh_id(bss));
776 } else {
777 iwe.u.data.length = bss->ssid_len;
778 iwe.u.data.flags = 1;
779 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
780 &iwe, bss->ssid);
781 }
782
783 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
784 || bss_mesh_cfg(bss)) {
785 memset(&iwe, 0, sizeof(iwe));
786 iwe.cmd = SIOCGIWMODE;
787 if (bss_mesh_cfg(bss))
788 iwe.u.mode = IW_MODE_MESH;
789 else if (bss->capability & WLAN_CAPABILITY_ESS)
790 iwe.u.mode = IW_MODE_MASTER;
791 else
792 iwe.u.mode = IW_MODE_ADHOC;
793 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
794 &iwe, IW_EV_UINT_LEN);
795 }
796
797 memset(&iwe, 0, sizeof(iwe));
798 iwe.cmd = SIOCGIWFREQ;
799 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
800 iwe.u.freq.e = 0;
801 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
802 IW_EV_FREQ_LEN);
803
804 memset(&iwe, 0, sizeof(iwe));
805 iwe.cmd = SIOCGIWFREQ;
806 iwe.u.freq.m = bss->freq;
807 iwe.u.freq.e = 6;
808 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
809 IW_EV_FREQ_LEN);
810 memset(&iwe, 0, sizeof(iwe));
811 iwe.cmd = IWEVQUAL;
812 iwe.u.qual.qual = bss->qual;
813 iwe.u.qual.level = bss->signal;
814 iwe.u.qual.noise = bss->noise;
815 iwe.u.qual.updated = local->wstats_flags;
816 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
817 IW_EV_QUAL_LEN);
818
819 memset(&iwe, 0, sizeof(iwe));
820 iwe.cmd = SIOCGIWENCODE;
821 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
822 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
823 else
824 iwe.u.data.flags = IW_ENCODE_DISABLED;
825 iwe.u.data.length = 0;
826 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
827 &iwe, "");
828
829 ieee80211_scan_add_ies(info, bss, &current_ev, end_buf);
830
831 if (bss->supp_rates_len > 0) {
832 /* display all supported rates in readable format */
833 char *p = current_ev + iwe_stream_lcp_len(info);
834 int i;
835
836 memset(&iwe, 0, sizeof(iwe));
837 iwe.cmd = SIOCGIWRATE;
838 /* Those two flags are ignored... */
839 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
840
841 for (i = 0; i < bss->supp_rates_len; i++) {
842 iwe.u.bitrate.value = ((bss->supp_rates[i] &
843 0x7f) * 500000);
844 p = iwe_stream_add_value(info, current_ev, p,
845 end_buf, &iwe, IW_EV_PARAM_LEN);
846 }
847 current_ev = p;
848 }
849
850 buf = kmalloc(30, GFP_ATOMIC);
851 if (buf) {
852 memset(&iwe, 0, sizeof(iwe));
853 iwe.cmd = IWEVCUSTOM;
854 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
855 iwe.u.data.length = strlen(buf);
856 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
857 &iwe, buf);
858 memset(&iwe, 0, sizeof(iwe));
859 iwe.cmd = IWEVCUSTOM;
860 sprintf(buf, " Last beacon: %dms ago",
861 jiffies_to_msecs(jiffies - bss->last_update));
862 iwe.u.data.length = strlen(buf);
863 current_ev = iwe_stream_add_point(info, current_ev,
864 end_buf, &iwe, buf);
865 kfree(buf);
866 }
867
868 if (bss_mesh_cfg(bss)) {
869 u8 *cfg = bss_mesh_cfg(bss);
870 buf = kmalloc(50, GFP_ATOMIC);
871 if (buf) {
872 memset(&iwe, 0, sizeof(iwe));
873 iwe.cmd = IWEVCUSTOM;
874 sprintf(buf, "Mesh network (version %d)", cfg[0]);
875 iwe.u.data.length = strlen(buf);
876 current_ev = iwe_stream_add_point(info, current_ev,
877 end_buf,
878 &iwe, buf);
879 sprintf(buf, "Path Selection Protocol ID: "
880 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
881 cfg[4]);
882 iwe.u.data.length = strlen(buf);
883 current_ev = iwe_stream_add_point(info, current_ev,
884 end_buf,
885 &iwe, buf);
886 sprintf(buf, "Path Selection Metric ID: "
887 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
888 cfg[8]);
889 iwe.u.data.length = strlen(buf);
890 current_ev = iwe_stream_add_point(info, current_ev,
891 end_buf,
892 &iwe, buf);
893 sprintf(buf, "Congestion Control Mode ID: "
894 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
895 cfg[11], cfg[12]);
896 iwe.u.data.length = strlen(buf);
897 current_ev = iwe_stream_add_point(info, current_ev,
898 end_buf,
899 &iwe, buf);
900 sprintf(buf, "Channel Precedence: "
901 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
902 cfg[15], cfg[16]);
903 iwe.u.data.length = strlen(buf);
904 current_ev = iwe_stream_add_point(info, current_ev,
905 end_buf,
906 &iwe, buf);
907 kfree(buf);
908 }
909 }
910
911 return current_ev;
912 }
913
914
915 int ieee80211_scan_results(struct ieee80211_local *local,
916 struct iw_request_info *info,
917 char *buf, size_t len)
918 {
919 char *current_ev = buf;
920 char *end_buf = buf + len;
921 struct ieee80211_bss *bss;
922
923 spin_lock_bh(&local->bss_lock);
924 list_for_each_entry(bss, &local->bss_list, list) {
925 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
926 spin_unlock_bh(&local->bss_lock);
927 return -E2BIG;
928 }
929 current_ev = ieee80211_scan_result(local, info, bss,
930 current_ev, end_buf);
931 }
932 spin_unlock_bh(&local->bss_lock);
933 return current_ev - buf;
934 }
(Inofficial) Linux kernel tree running on the Nao robot