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mac80211: fix work race
[deliverable/linux.git] / net / mac80211 / scan.c
CommitLineData
0a51b27e 1/*
5484e237
JB		 2 * Scanning implementation
3 *
0a51b27e
JB		 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
5484e237
JB		 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
0a51b27e
JB		 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"
5484e237 27#include "mesh.h"
0a51b27e
JB		 28
29#define IEEE80211_PROBE_DELAY (HZ / 33)
30#define IEEE80211_CHANNEL_TIME (HZ / 33)
31#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
32
5484e237
JB		 33void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
34{
35 spin_lock_init(&local->sta_bss_lock);
36 INIT_LIST_HEAD(&local->sta_bss_list);
37}
38
39void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
40{
41 struct ieee80211_sta_bss *bss, *tmp;
42
43 list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
44 ieee80211_rx_bss_put(local, bss);
45}
46
47struct ieee80211_sta_bss *
48ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
49 u8 *ssid, u8 ssid_len)
50{
51 struct ieee80211_sta_bss *bss;
52
53 spin_lock_bh(&local->sta_bss_lock);
54 bss = local->sta_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->sta_bss_lock);
67 return bss;
68}
69
70/* Caller must hold local->sta_bss_lock */
71static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
72 struct ieee80211_sta_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->sta_bss_hash[hash_idx];
83 local->sta_bss_hash[hash_idx] = bss;
84}
85
86/* Caller must hold local->sta_bss_lock */
87static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
88 struct ieee80211_sta_bss *bss)
89{
90 struct ieee80211_sta_bss *b, *prev = NULL;
91 b = local->sta_bss_hash[STA_HASH(bss->bssid)];
92 while (b) {
93 if (b == bss) {
94 if (!prev)
95 local->sta_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
106struct ieee80211_sta_bss *
107ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
108 u8 *ssid, u8 ssid_len)
109{
110 struct ieee80211_sta_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->sta_bss_lock);
124 /* TODO: order by RSSI? */
125 list_add_tail(&bss->list, &local->sta_bss_list);
126 __ieee80211_rx_bss_hash_add(local, bss);
127 spin_unlock_bh(&local->sta_bss_lock);
128 return bss;
129}
130
131#ifdef CONFIG_MAC80211_MESH
132static struct ieee80211_sta_bss *
133ieee80211_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_sta_bss *bss;
137
138 spin_lock_bh(&local->sta_bss_lock);
139 bss = local->sta_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->sta_bss_lock);
153 return bss;
154}
155
156static struct ieee80211_sta_bss *
157ieee80211_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_sta_bss *bss;
161
162 if (mesh_config_len != MESH_CFG_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->sta_bss_lock);
190 /* TODO: order by RSSI? */
191 list_add_tail(&bss->list, &local->sta_bss_list);
192 __ieee80211_rx_bss_hash_add(local, bss);
193 spin_unlock_bh(&local->sta_bss_lock);
194 return bss;
195}
196#endif
197
198static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
199{
200 kfree(bss->ies);
201 kfree(bss_mesh_id(bss));
202 kfree(bss_mesh_cfg(bss));
203 kfree(bss);
204}
205
206void ieee80211_rx_bss_put(struct ieee80211_local *local,
207 struct ieee80211_sta_bss *bss)
208{
209 local_bh_disable();
210 if (!atomic_dec_and_lock(&bss->users, &local->sta_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->sta_bss_lock);
218 ieee80211_rx_bss_free(bss);
219}
220
221struct ieee80211_sta_bss *
222ieee80211_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_sta_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->sta_bss_lock);
256 list_move_tail(&bss->list, &local->sta_bss_list);
257 spin_unlock_bh(&local->sta_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}
0a51b27e 328
98c8fccf
JB		 329ieee80211_rx_result
330ieee80211_sta_rx_scan(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_sta_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 ieee80211_rx_bss_put(sdata->local, bss);
392
393 dev_kfree_skb(skb);
394 return RX_QUEUED;
395}
396
0a51b27e
JB		 397static void ieee80211_send_nullfunc(struct ieee80211_local *local,
398 struct ieee80211_sub_if_data *sdata,
399 int powersave)
400{
401 struct sk_buff *skb;
402 struct ieee80211_hdr *nullfunc;
403 __le16 fc;
404
405 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
406 if (!skb) {
407 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
408 "frame\n", sdata->dev->name);
409 return;
410 }
411 skb_reserve(skb, local->hw.extra_tx_headroom);
412
413 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
414 memset(nullfunc, 0, 24);
415 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
416 IEEE80211_FCTL_TODS);
417 if (powersave)
418 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
419 nullfunc->frame_control = fc;
420 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
421 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
422 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
423
e50db65c 424 ieee80211_tx_skb(sdata, skb, 0);
0a51b27e
JB		 425}
426
0a51b27e
JB		 427void ieee80211_scan_completed(struct ieee80211_hw *hw)
428{
429 struct ieee80211_local *local = hw_to_local(hw);
430 struct ieee80211_sub_if_data *sdata;
431 union iwreq_data wrqu;
432
433 local->last_scan_completed = jiffies;
434 memset(&wrqu, 0, sizeof(wrqu));
435 wireless_send_event(local->scan_sdata->dev, SIOCGIWSCAN, &wrqu, NULL);
436
437 if (local->sta_hw_scanning) {
438 local->sta_hw_scanning = 0;
439 if (ieee80211_hw_config(local))
440 printk(KERN_DEBUG "%s: failed to restore operational "
441 "channel after scan\n", wiphy_name(local->hw.wiphy));
0a51b27e
JB		 442
443 goto done;
444 }
445
446 local->sta_sw_scanning = 0;
447 if (ieee80211_hw_config(local))
448 printk(KERN_DEBUG "%s: failed to restore operational "
449 "channel after scan\n", wiphy_name(local->hw.wiphy));
450
451
452 netif_tx_lock_bh(local->mdev);
453 netif_addr_lock(local->mdev);
454 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
455 local->ops->configure_filter(local_to_hw(local),
456 FIF_BCN_PRBRESP_PROMISC,
457 &local->filter_flags,
458 local->mdev->mc_count,
459 local->mdev->mc_list);
460
461 netif_addr_unlock(local->mdev);
462 netif_tx_unlock_bh(local->mdev);
463
464 rcu_read_lock();
465 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
466 /* Tell AP we're back */
467 if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
468 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
469 ieee80211_send_nullfunc(local, sdata, 0);
470 netif_tx_wake_all_queues(sdata->dev);
471 }
472 } else
473 netif_tx_wake_all_queues(sdata->dev);
0a51b27e
JB		 474 }
475 rcu_read_unlock();
476
477 done:
478 ieee80211_mlme_notify_scan_completed(local);
472dbc45 479 ieee80211_mesh_notify_scan_completed(local);
0a51b27e
JB		 480}
481EXPORT_SYMBOL(ieee80211_scan_completed);
482
483
484void ieee80211_sta_scan_work(struct work_struct *work)
485{
486 struct ieee80211_local *local =
487 container_of(work, struct ieee80211_local, scan_work.work);
488 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
489 struct ieee80211_supported_band *sband;
490 struct ieee80211_channel *chan;
491 int skip;
492 unsigned long next_delay = 0;
493
494 if (!local->sta_sw_scanning)
495 return;
496
497 switch (local->scan_state) {
498 case SCAN_SET_CHANNEL:
499 /*
500 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
501 * after we successfully scanned the last channel of the last
502 * band (and the last band is supported by the hw)
503 */
504 if (local->scan_band < IEEE80211_NUM_BANDS)
505 sband = local->hw.wiphy->bands[local->scan_band];
506 else
507 sband = NULL;
508
509 /*
510 * If we are at an unsupported band and have more bands
511 * left to scan, advance to the next supported one.
512 */
513 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
514 local->scan_band++;
515 sband = local->hw.wiphy->bands[local->scan_band];
516 local->scan_channel_idx = 0;
517 }
518
519 /* if no more bands/channels left, complete scan */
520 if (!sband || local->scan_channel_idx >= sband->n_channels) {
521 ieee80211_scan_completed(local_to_hw(local));
522 return;
523 }
524 skip = 0;
525 chan = &sband->channels[local->scan_channel_idx];
526
527 if (chan->flags & IEEE80211_CHAN_DISABLED ||
528 (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
529 chan->flags & IEEE80211_CHAN_NO_IBSS))
530 skip = 1;
531
532 if (!skip) {
533 local->scan_channel = chan;
534 if (ieee80211_hw_config(local)) {
535 printk(KERN_DEBUG "%s: failed to set freq to "
536 "%d MHz for scan\n", wiphy_name(local->hw.wiphy),
537 chan->center_freq);
538 skip = 1;
539 }
540 }
541
542 /* advance state machine to next channel/band */
543 local->scan_channel_idx++;
544 if (local->scan_channel_idx >= sband->n_channels) {
545 /*
546 * scan_band may end up == IEEE80211_NUM_BANDS, but
547 * we'll catch that case above and complete the scan
548 * if that is the case.
549 */
550 local->scan_band++;
551 local->scan_channel_idx = 0;
552 }
553
554 if (skip)
555 break;
556
557 next_delay = IEEE80211_PROBE_DELAY +
558 usecs_to_jiffies(local->hw.channel_change_time);
559 local->scan_state = SCAN_SEND_PROBE;
560 break;
561 case SCAN_SEND_PROBE:
562 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
563 local->scan_state = SCAN_SET_CHANNEL;
564
565 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
566 break;
567 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
568 local->scan_ssid_len);
569 next_delay = IEEE80211_CHANNEL_TIME;
570 break;
571 }
572
573 if (local->sta_sw_scanning)
574 queue_delayed_work(local->hw.workqueue, &local->scan_work,
575 next_delay);
576}
577
578
579int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata,
580 u8 *ssid, size_t ssid_len)
581{
582 struct ieee80211_local *local = scan_sdata->local;
583 struct ieee80211_sub_if_data *sdata;
584
585 if (ssid_len > IEEE80211_MAX_SSID_LEN)
586 return -EINVAL;
587
588 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
589 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
590 * BSSID: MACAddress
591 * SSID
592 * ScanType: ACTIVE, PASSIVE
593 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
594 * a Probe frame during active scanning
595 * ChannelList
596 * MinChannelTime (>= ProbeDelay), in TU
597 * MaxChannelTime: (>= MinChannelTime), in TU
598 */
599
600 /* MLME-SCAN.confirm
601 * BSSDescriptionSet
602 * ResultCode: SUCCESS, INVALID_PARAMETERS
603 */
604
605 if (local->sta_sw_scanning || local->sta_hw_scanning) {
606 if (local->scan_sdata == scan_sdata)
607 return 0;
608 return -EBUSY;
609 }
610
611 if (local->ops->hw_scan) {
612 int rc = local->ops->hw_scan(local_to_hw(local),
613 ssid, ssid_len);
614 if (!rc) {
615 local->sta_hw_scanning = 1;
616 local->scan_sdata = scan_sdata;
617 }
618 return rc;
619 }
620
621 local->sta_sw_scanning = 1;
622
623 rcu_read_lock();
624 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
625 if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
626 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
627 netif_tx_stop_all_queues(sdata->dev);
628 ieee80211_send_nullfunc(local, sdata, 1);
629 }
630 } else
631 netif_tx_stop_all_queues(sdata->dev);
632 }
633 rcu_read_unlock();
634
635 if (ssid) {
636 local->scan_ssid_len = ssid_len;
637 memcpy(local->scan_ssid, ssid, ssid_len);
638 } else
639 local->scan_ssid_len = 0;
640 local->scan_state = SCAN_SET_CHANNEL;
641 local->scan_channel_idx = 0;
642 local->scan_band = IEEE80211_BAND_2GHZ;
643 local->scan_sdata = scan_sdata;
644
645 netif_addr_lock_bh(local->mdev);
646 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
647 local->ops->configure_filter(local_to_hw(local),
648 FIF_BCN_PRBRESP_PROMISC,
649 &local->filter_flags,
650 local->mdev->mc_count,
651 local->mdev->mc_list);
652 netif_addr_unlock_bh(local->mdev);
653
654 /* TODO: start scan as soon as all nullfunc frames are ACKed */
655 queue_delayed_work(local->hw.workqueue, &local->scan_work,
656 IEEE80211_CHANNEL_TIME);
657
658 return 0;
659}
660
661
662int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len)
663{
0a51b27e 664 struct ieee80211_local *local = sdata->local;
9116dd01 665 struct ieee80211_if_sta *ifsta;
0a51b27e
JB		 666
667 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
668 return ieee80211_sta_start_scan(sdata, ssid, ssid_len);
669
9116dd01
JB		 670 /*
671 * STA has a state machine that might need to defer scanning
672 * while it's trying to associate/authenticate, therefore we
673 * queue it up to the state machine in that case.
674 */
675
0a51b27e
JB		 676 if (local->sta_sw_scanning || local->sta_hw_scanning) {
677 if (local->scan_sdata == sdata)
678 return 0;
679 return -EBUSY;
680 }
681
9116dd01
JB		 682 ifsta = &sdata->u.sta;
683
0a51b27e
JB		 684 ifsta->scan_ssid_len = ssid_len;
685 if (ssid_len)
686 memcpy(ifsta->scan_ssid, ssid, ssid_len);
687 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
688 queue_work(local->hw.workqueue, &ifsta->work);
9116dd01 689
0a51b27e
JB		 690 return 0;
691}
692
693
694static void ieee80211_sta_add_scan_ies(struct iw_request_info *info,
695 struct ieee80211_sta_bss *bss,
696 char **current_ev, char *end_buf)
697{
698 u8 *pos, *end, *next;
699 struct iw_event iwe;
700
701 if (bss == NULL || bss->ies == NULL)
702 return;
703
704 /*
705 * If needed, fragment the IEs buffer (at IE boundaries) into short
706 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
707 */
708 pos = bss->ies;
709 end = pos + bss->ies_len;
710
711 while (end - pos > IW_GENERIC_IE_MAX) {
712 next = pos + 2 + pos[1];
713 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
714 next = next + 2 + next[1];
715
716 memset(&iwe, 0, sizeof(iwe));
717 iwe.cmd = IWEVGENIE;
718 iwe.u.data.length = next - pos;
719 *current_ev = iwe_stream_add_point(info, *current_ev,
720 end_buf, &iwe, pos);
721
722 pos = next;
723 }
724
725 if (end > pos) {
726 memset(&iwe, 0, sizeof(iwe));
727 iwe.cmd = IWEVGENIE;
728 iwe.u.data.length = end - pos;
729 *current_ev = iwe_stream_add_point(info, *current_ev,
730 end_buf, &iwe, pos);
731 }
732}
733
734
735static char *
736ieee80211_sta_scan_result(struct ieee80211_local *local,
737 struct iw_request_info *info,
738 struct ieee80211_sta_bss *bss,
739 char *current_ev, char *end_buf)
740{
741 struct iw_event iwe;
742 char *buf;
743
744 if (time_after(jiffies,
745 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
746 return current_ev;
747
748 memset(&iwe, 0, sizeof(iwe));
749 iwe.cmd = SIOCGIWAP;
750 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
751 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
752 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
753 IW_EV_ADDR_LEN);
754
755 memset(&iwe, 0, sizeof(iwe));
756 iwe.cmd = SIOCGIWESSID;
757 if (bss_mesh_cfg(bss)) {
758 iwe.u.data.length = bss_mesh_id_len(bss);
759 iwe.u.data.flags = 1;
760 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
761 &iwe, bss_mesh_id(bss));
762 } else {
763 iwe.u.data.length = bss->ssid_len;
764 iwe.u.data.flags = 1;
765 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
766 &iwe, bss->ssid);
767 }
768
769 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
770 || bss_mesh_cfg(bss)) {
771 memset(&iwe, 0, sizeof(iwe));
772 iwe.cmd = SIOCGIWMODE;
773 if (bss_mesh_cfg(bss))
774 iwe.u.mode = IW_MODE_MESH;
775 else if (bss->capability & WLAN_CAPABILITY_ESS)
776 iwe.u.mode = IW_MODE_MASTER;
777 else
778 iwe.u.mode = IW_MODE_ADHOC;
779 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
780 &iwe, IW_EV_UINT_LEN);
781 }
782
783 memset(&iwe, 0, sizeof(iwe));
784 iwe.cmd = SIOCGIWFREQ;
785 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
786 iwe.u.freq.e = 0;
787 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
788 IW_EV_FREQ_LEN);
789
790 memset(&iwe, 0, sizeof(iwe));
791 iwe.cmd = SIOCGIWFREQ;
792 iwe.u.freq.m = bss->freq;
793 iwe.u.freq.e = 6;
794 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
795 IW_EV_FREQ_LEN);
796 memset(&iwe, 0, sizeof(iwe));
797 iwe.cmd = IWEVQUAL;
798 iwe.u.qual.qual = bss->qual;
799 iwe.u.qual.level = bss->signal;
800 iwe.u.qual.noise = bss->noise;
801 iwe.u.qual.updated = local->wstats_flags;
802 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
803 IW_EV_QUAL_LEN);
804
805 memset(&iwe, 0, sizeof(iwe));
806 iwe.cmd = SIOCGIWENCODE;
807 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
808 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
809 else
810 iwe.u.data.flags = IW_ENCODE_DISABLED;
811 iwe.u.data.length = 0;
812 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
813 &iwe, "");
814
815 ieee80211_sta_add_scan_ies(info, bss, &current_ev, end_buf);
816
817 if (bss->supp_rates_len > 0) {
818 /* display all supported rates in readable format */
819 char *p = current_ev + iwe_stream_lcp_len(info);
820 int i;
821
822 memset(&iwe, 0, sizeof(iwe));
823 iwe.cmd = SIOCGIWRATE;
824 /* Those two flags are ignored... */
825 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
826
827 for (i = 0; i < bss->supp_rates_len; i++) {
828 iwe.u.bitrate.value = ((bss->supp_rates[i] &
829 0x7f) * 500000);
830 p = iwe_stream_add_value(info, current_ev, p,
831 end_buf, &iwe, IW_EV_PARAM_LEN);
832 }
833 current_ev = p;
834 }
835
836 buf = kmalloc(30, GFP_ATOMIC);
837 if (buf) {
838 memset(&iwe, 0, sizeof(iwe));
839 iwe.cmd = IWEVCUSTOM;
840 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
841 iwe.u.data.length = strlen(buf);
842 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
843 &iwe, buf);
844 memset(&iwe, 0, sizeof(iwe));
845 iwe.cmd = IWEVCUSTOM;
846 sprintf(buf, " Last beacon: %dms ago",
847 jiffies_to_msecs(jiffies - bss->last_update));
848 iwe.u.data.length = strlen(buf);
849 current_ev = iwe_stream_add_point(info, current_ev,
850 end_buf, &iwe, buf);
851 kfree(buf);
852 }
853
854 if (bss_mesh_cfg(bss)) {
855 u8 *cfg = bss_mesh_cfg(bss);
856 buf = kmalloc(50, GFP_ATOMIC);
857 if (buf) {
858 memset(&iwe, 0, sizeof(iwe));
859 iwe.cmd = IWEVCUSTOM;
860 sprintf(buf, "Mesh network (version %d)", cfg[0]);
861 iwe.u.data.length = strlen(buf);
862 current_ev = iwe_stream_add_point(info, current_ev,
863 end_buf,
864 &iwe, buf);
865 sprintf(buf, "Path Selection Protocol ID: "
866 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
867 cfg[4]);
868 iwe.u.data.length = strlen(buf);
869 current_ev = iwe_stream_add_point(info, current_ev,
870 end_buf,
871 &iwe, buf);
872 sprintf(buf, "Path Selection Metric ID: "
873 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
874 cfg[8]);
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, "Congestion Control Mode ID: "
880 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
881 cfg[11], cfg[12]);
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, "Channel Precedence: "
887 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
888 cfg[15], cfg[16]);
889 iwe.u.data.length = strlen(buf);
890 current_ev = iwe_stream_add_point(info, current_ev,
891 end_buf,
892 &iwe, buf);
893 kfree(buf);
894 }
895 }
896
897 return current_ev;
898}
899
900
901int ieee80211_sta_scan_results(struct ieee80211_local *local,
902 struct iw_request_info *info,
903 char *buf, size_t len)
904{
905 char *current_ev = buf;
906 char *end_buf = buf + len;
907 struct ieee80211_sta_bss *bss;
908
909 spin_lock_bh(&local->sta_bss_lock);
910 list_for_each_entry(bss, &local->sta_bss_list, list) {
911 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
912 spin_unlock_bh(&local->sta_bss_lock);
913 return -E2BIG;
914 }
915 current_ev = ieee80211_sta_scan_result(local, info, bss,
916 current_ev, end_buf);
917 }
918 spin_unlock_bh(&local->sta_bss_lock);
919 return current_ev - buf;
920}
Linux kernel - Deliverables
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