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cfg80211: do not pass -EALREADY to userspace on regdomain change request
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
078e1e60 23#include <linux/rtnetlink.h>
0a51b27e
JB		 24#include <net/mac80211.h>
25#include <net/iw_handler.h>
26
27#include "ieee80211_i.h"
5484e237 28#include "mesh.h"
0a51b27e
JB		 29
30#define IEEE80211_PROBE_DELAY (HZ / 33)
31#define IEEE80211_CHANNEL_TIME (HZ / 33)
32#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
33
5484e237
JB		 34void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
35{
c2b13452
JB		 36 spin_lock_init(&local->bss_lock);
37 INIT_LIST_HEAD(&local->bss_list);
5484e237
JB		 38}
39
40void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
41{
c2b13452 42 struct ieee80211_bss *bss, *tmp;
5484e237 43
c2b13452 44 list_for_each_entry_safe(bss, tmp, &local->bss_list, list)
5484e237
JB		 45 ieee80211_rx_bss_put(local, bss);
46}
47
c2b13452 48struct ieee80211_bss *
5484e237
JB		 49ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
50 u8 *ssid, u8 ssid_len)
51{
c2b13452 52 struct ieee80211_bss *bss;
5484e237 53
c2b13452
JB		 54 spin_lock_bh(&local->bss_lock);
55 bss = local->bss_hash[STA_HASH(bssid)];
5484e237
JB		 56 while (bss) {
57 if (!bss_mesh_cfg(bss) &&
58 !memcmp(bss->bssid, bssid, ETH_ALEN) &&
59 bss->freq == freq &&
60 bss->ssid_len == ssid_len &&
61 (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
62 atomic_inc(&bss->users);
63 break;
64 }
65 bss = bss->hnext;
66 }
c2b13452 67 spin_unlock_bh(&local->bss_lock);
5484e237
JB		 68 return bss;
69}
70
c2b13452 71/* Caller must hold local->bss_lock */
5484e237 72static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
c2b13452 73 struct ieee80211_bss *bss)
5484e237
JB		 74{
75 u8 hash_idx;
76
77 if (bss_mesh_cfg(bss))
78 hash_idx = mesh_id_hash(bss_mesh_id(bss),
79 bss_mesh_id_len(bss));
80 else
81 hash_idx = STA_HASH(bss->bssid);
82
c2b13452
JB		 83 bss->hnext = local->bss_hash[hash_idx];
84 local->bss_hash[hash_idx] = bss;
5484e237
JB		 85}
86
c2b13452 87/* Caller must hold local->bss_lock */
5484e237 88static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
c2b13452 89 struct ieee80211_bss *bss)
5484e237 90{
c2b13452
JB		 91 struct ieee80211_bss *b, *prev = NULL;
92 b = local->bss_hash[STA_HASH(bss->bssid)];
5484e237
JB		 93 while (b) {
94 if (b == bss) {
95 if (!prev)
c2b13452 96 local->bss_hash[STA_HASH(bss->bssid)] =
5484e237
JB		 97 bss->hnext;
98 else
99 prev->hnext = bss->hnext;
100 break;
101 }
102 prev = b;
103 b = b->hnext;
104 }
105}
106
c2b13452 107struct ieee80211_bss *
5484e237
JB		 108ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
109 u8 *ssid, u8 ssid_len)
110{
c2b13452 111 struct ieee80211_bss *bss;
5484e237
JB		 112
113 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
114 if (!bss)
115 return NULL;
116 atomic_set(&bss->users, 2);
117 memcpy(bss->bssid, bssid, ETH_ALEN);
118 bss->freq = freq;
119 if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
120 memcpy(bss->ssid, ssid, ssid_len);
121 bss->ssid_len = ssid_len;
122 }
123
c2b13452 124 spin_lock_bh(&local->bss_lock);
5484e237 125 /* TODO: order by RSSI? */
c2b13452 126 list_add_tail(&bss->list, &local->bss_list);
5484e237 127 __ieee80211_rx_bss_hash_add(local, bss);
c2b13452 128 spin_unlock_bh(&local->bss_lock);
5484e237
JB		 129 return bss;
130}
131
132#ifdef CONFIG_MAC80211_MESH
c2b13452 133static struct ieee80211_bss *
5484e237
JB		 134ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
135 u8 *mesh_cfg, int freq)
136{
c2b13452 137 struct ieee80211_bss *bss;
5484e237 138
c2b13452
JB		 139 spin_lock_bh(&local->bss_lock);
140 bss = local->bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
5484e237
JB		 141 while (bss) {
142 if (bss_mesh_cfg(bss) &&
143 !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
144 bss->freq == freq &&
145 mesh_id_len == bss->mesh_id_len &&
146 (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
147 mesh_id_len))) {
148 atomic_inc(&bss->users);
149 break;
150 }
151 bss = bss->hnext;
152 }
c2b13452 153 spin_unlock_bh(&local->bss_lock);
5484e237
JB		 154 return bss;
155}
156
c2b13452 157static struct ieee80211_bss *
5484e237
JB		 158ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
159 u8 *mesh_cfg, int mesh_config_len, int freq)
160{
c2b13452 161 struct ieee80211_bss *bss;
5484e237 162
1239cd58 163 if (mesh_config_len != IEEE80211_MESH_CONFIG_LEN)
5484e237
JB		 164 return NULL;
165
166 bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
167 if (!bss)
168 return NULL;
169
170 bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
171 if (!bss->mesh_cfg) {
172 kfree(bss);
173 return NULL;
174 }
175
176 if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
177 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
178 if (!bss->mesh_id) {
179 kfree(bss->mesh_cfg);
180 kfree(bss);
181 return NULL;
182 }
183 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
184 }
185
186 atomic_set(&bss->users, 2);
187 memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
188 bss->mesh_id_len = mesh_id_len;
189 bss->freq = freq;
c2b13452 190 spin_lock_bh(&local->bss_lock);
5484e237 191 /* TODO: order by RSSI? */
c2b13452 192 list_add_tail(&bss->list, &local->bss_list);
5484e237 193 __ieee80211_rx_bss_hash_add(local, bss);
c2b13452 194 spin_unlock_bh(&local->bss_lock);
5484e237
JB		 195 return bss;
196}
197#endif
198
c2b13452 199static void ieee80211_rx_bss_free(struct ieee80211_bss *bss)
5484e237
JB		 200{
201 kfree(bss->ies);
202 kfree(bss_mesh_id(bss));
203 kfree(bss_mesh_cfg(bss));
204 kfree(bss);
205}
206
207void ieee80211_rx_bss_put(struct ieee80211_local *local,
c2b13452 208 struct ieee80211_bss *bss)
5484e237
JB		 209{
210 local_bh_disable();
c2b13452 211 if (!atomic_dec_and_lock(&bss->users, &local->bss_lock)) {
5484e237
JB		 212 local_bh_enable();
213 return;
214 }
215
216 __ieee80211_rx_bss_hash_del(local, bss);
217 list_del(&bss->list);
c2b13452 218 spin_unlock_bh(&local->bss_lock);
5484e237
JB		 219 ieee80211_rx_bss_free(bss);
220}
221
c2b13452 222struct ieee80211_bss *
5484e237
JB		 223ieee80211_bss_info_update(struct ieee80211_local *local,
224 struct ieee80211_rx_status *rx_status,
225 struct ieee80211_mgmt *mgmt,
226 size_t len,
227 struct ieee802_11_elems *elems,
228 int freq, bool beacon)
229{
c2b13452 230 struct ieee80211_bss *bss;
5484e237
JB		 231 int clen;
232
233#ifdef CONFIG_MAC80211_MESH
234 if (elems->mesh_config)
235 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
236 elems->mesh_id_len, elems->mesh_config, freq);
237 else
238#endif
239 bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
240 elems->ssid, elems->ssid_len);
241 if (!bss) {
242#ifdef CONFIG_MAC80211_MESH
243 if (elems->mesh_config)
244 bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
245 elems->mesh_id_len, elems->mesh_config,
246 elems->mesh_config_len, freq);
247 else
248#endif
249 bss = ieee80211_rx_bss_add(local, mgmt->bssid, freq,
250 elems->ssid, elems->ssid_len);
251 if (!bss)
252 return NULL;
253 } else {
254#if 0
255 /* TODO: order by RSSI? */
c2b13452
JB		 256 spin_lock_bh(&local->bss_lock);
257 list_move_tail(&bss->list, &local->bss_list);
258 spin_unlock_bh(&local->bss_lock);
5484e237
JB		 259#endif
260 }
261
262 /* save the ERP value so that it is available at association time */
263 if (elems->erp_info && elems->erp_info_len >= 1) {
264 bss->erp_value = elems->erp_info[0];
265 bss->has_erp_value = 1;
266 }
267
268 bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
269 bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
270
271 if (elems->tim) {
272 struct ieee80211_tim_ie *tim_ie =
273 (struct ieee80211_tim_ie *)elems->tim;
274 bss->dtim_period = tim_ie->dtim_period;
275 }
276
277 /* set default value for buggy APs */
278 if (!elems->tim || bss->dtim_period == 0)
279 bss->dtim_period = 1;
280
281 bss->supp_rates_len = 0;
282 if (elems->supp_rates) {
283 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
284 if (clen > elems->supp_rates_len)
285 clen = elems->supp_rates_len;
286 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
287 clen);
288 bss->supp_rates_len += clen;
289 }
290 if (elems->ext_supp_rates) {
291 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
292 if (clen > elems->ext_supp_rates_len)
293 clen = elems->ext_supp_rates_len;
294 memcpy(&bss->supp_rates[bss->supp_rates_len],
295 elems->ext_supp_rates, clen);
296 bss->supp_rates_len += clen;
297 }
298
299 bss->band = rx_status->band;
300
301 bss->timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
302 bss->last_update = jiffies;
303 bss->signal = rx_status->signal;
304 bss->noise = rx_status->noise;
305 bss->qual = rx_status->qual;
306 bss->wmm_used = elems->wmm_param || elems->wmm_info;
307
308 if (!beacon)
309 bss->last_probe_resp = jiffies;
310
311 /*
312 * For probe responses, or if we don't have any information yet,
313 * use the IEs from the beacon.
314 */
315 if (!bss->ies || !beacon) {
316 if (bss->ies == NULL || bss->ies_len < elems->total_len) {
317 kfree(bss->ies);
318 bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
319 }
320 if (bss->ies) {
321 memcpy(bss->ies, elems->ie_start, elems->total_len);
322 bss->ies_len = elems->total_len;
323 } else
324 bss->ies_len = 0;
325 }
326
327 return bss;
328}
0a51b27e 329
98c8fccf 330ieee80211_rx_result
c2b13452
JB		 331ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
332 struct ieee80211_rx_status *rx_status)
98c8fccf
JB		 333{
334 struct ieee80211_mgmt *mgmt;
c2b13452 335 struct ieee80211_bss *bss;
98c8fccf
JB		 336 u8 *elements;
337 struct ieee80211_channel *channel;
338 size_t baselen;
339 int freq;
340 __le16 fc;
341 bool presp, beacon = false;
342 struct ieee802_11_elems elems;
343
344 if (skb->len < 2)
345 return RX_DROP_UNUSABLE;
346
347 mgmt = (struct ieee80211_mgmt *) skb->data;
348 fc = mgmt->frame_control;
349
350 if (ieee80211_is_ctl(fc))
351 return RX_CONTINUE;
352
353 if (skb->len < 24)
354 return RX_DROP_MONITOR;
355
356 presp = ieee80211_is_probe_resp(fc);
357 if (presp) {
358 /* ignore ProbeResp to foreign address */
359 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
360 return RX_DROP_MONITOR;
361
362 presp = true;
363 elements = mgmt->u.probe_resp.variable;
364 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
365 } else {
366 beacon = ieee80211_is_beacon(fc);
367 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
368 elements = mgmt->u.beacon.variable;
369 }
370
371 if (!presp && !beacon)
372 return RX_CONTINUE;
373
374 if (baselen > skb->len)
375 return RX_DROP_MONITOR;
376
377 ieee802_11_parse_elems(elements, skb->len - baselen, &elems);
378
379 if (elems.ds_params && elems.ds_params_len == 1)
380 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
381 else
382 freq = rx_status->freq;
383
384 channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
385
386 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
387 return RX_DROP_MONITOR;
388
389 bss = ieee80211_bss_info_update(sdata->local, rx_status,
390 mgmt, skb->len, &elems,
391 freq, beacon);
d048e503
JM		 392 if (bss)
393 ieee80211_rx_bss_put(sdata->local, bss);
98c8fccf
JB		 394
395 dev_kfree_skb(skb);
396 return RX_QUEUED;
397}
398
a97b77b9 399void ieee80211_send_nullfunc(struct ieee80211_local *local,
0a51b27e
JB		 400 struct ieee80211_sub_if_data *sdata,
401 int powersave)
402{
403 struct sk_buff *skb;
404 struct ieee80211_hdr *nullfunc;
405 __le16 fc;
406
407 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
408 if (!skb) {
409 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
410 "frame\n", sdata->dev->name);
411 return;
412 }
413 skb_reserve(skb, local->hw.extra_tx_headroom);
414
415 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
416 memset(nullfunc, 0, 24);
417 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
418 IEEE80211_FCTL_TODS);
419 if (powersave)
420 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
421 nullfunc->frame_control = fc;
422 memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
423 memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
424 memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
425
e50db65c 426 ieee80211_tx_skb(sdata, skb, 0);
0a51b27e
JB		 427}
428
0a51b27e
JB		 429void ieee80211_scan_completed(struct ieee80211_hw *hw)
430{
431 struct ieee80211_local *local = hw_to_local(hw);
432 struct ieee80211_sub_if_data *sdata;
433 union iwreq_data wrqu;
434
c2b13452 435 if (WARN_ON(!local->hw_scanning && !local->sw_scanning))
5bc75728
JB		 436 return;
437
0a51b27e
JB		 438 local->last_scan_completed = jiffies;
439 memset(&wrqu, 0, sizeof(wrqu));
5bc75728
JB		 440
441 /*
442 * local->scan_sdata could have been NULLed by the interface
443 * down code in case we were scanning on an interface that is
444 * being taken down.
445 */
446 sdata = local->scan_sdata;
447 if (sdata)
448 wireless_send_event(sdata->dev, SIOCGIWSCAN, &wrqu, NULL);
0a51b27e 449
c2b13452
JB		 450 if (local->hw_scanning) {
451 local->hw_scanning = false;
e8975581
JB		 452 /*
453 * Somebody might have requested channel change during scan
454 * that we won't have acted upon, try now. ieee80211_hw_config
455 * will set the flag based on actual changes.
456 */
457 ieee80211_hw_config(local, 0);
0a51b27e
JB		 458 goto done;
459 }
460
c2b13452 461 local->sw_scanning = false;
e8975581 462 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
0a51b27e
JB		 463
464 netif_tx_lock_bh(local->mdev);
465 netif_addr_lock(local->mdev);
466 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
467 local->ops->configure_filter(local_to_hw(local),
468 FIF_BCN_PRBRESP_PROMISC,
469 &local->filter_flags,
470 local->mdev->mc_count,
471 local->mdev->mc_list);
472
473 netif_addr_unlock(local->mdev);
474 netif_tx_unlock_bh(local->mdev);
475
078e1e60
JB		 476 mutex_lock(&local->iflist_mtx);
477 list_for_each_entry(sdata, &local->interfaces, list) {
0a51b27e 478 /* Tell AP we're back */
05c914fe 479 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
0a51b27e
JB		 480 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
481 ieee80211_send_nullfunc(local, sdata, 0);
482 netif_tx_wake_all_queues(sdata->dev);
483 }
484 } else
485 netif_tx_wake_all_queues(sdata->dev);
078e1e60
JB		 486
487 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON_ENABLED);
0a51b27e 488 }
078e1e60 489 mutex_unlock(&local->iflist_mtx);
0a51b27e
JB		 490
491 done:
492 ieee80211_mlme_notify_scan_completed(local);
472dbc45 493 ieee80211_mesh_notify_scan_completed(local);
0a51b27e
JB		 494}
495EXPORT_SYMBOL(ieee80211_scan_completed);
496
c2b13452 497void ieee80211_scan_work(struct work_struct *work)
0a51b27e
JB		 498{
499 struct ieee80211_local *local =
500 container_of(work, struct ieee80211_local, scan_work.work);
501 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
502 struct ieee80211_supported_band *sband;
503 struct ieee80211_channel *chan;
504 int skip;
505 unsigned long next_delay = 0;
506
5bc75728
JB		 507 /*
508 * Avoid re-scheduling when the sdata is going away.
509 */
510 if (!netif_running(sdata->dev))
0a51b27e
JB		 511 return;
512
513 switch (local->scan_state) {
514 case SCAN_SET_CHANNEL:
515 /*
516 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
517 * after we successfully scanned the last channel of the last
518 * band (and the last band is supported by the hw)
519 */
520 if (local->scan_band < IEEE80211_NUM_BANDS)
521 sband = local->hw.wiphy->bands[local->scan_band];
522 else
523 sband = NULL;
524
525 /*
526 * If we are at an unsupported band and have more bands
527 * left to scan, advance to the next supported one.
528 */
529 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
530 local->scan_band++;
531 sband = local->hw.wiphy->bands[local->scan_band];
532 local->scan_channel_idx = 0;
533 }
534
535 /* if no more bands/channels left, complete scan */
536 if (!sband || local->scan_channel_idx >= sband->n_channels) {
537 ieee80211_scan_completed(local_to_hw(local));
538 return;
539 }
540 skip = 0;
541 chan = &sband->channels[local->scan_channel_idx];
542
543 if (chan->flags & IEEE80211_CHAN_DISABLED ||
05c914fe 544 (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
0a51b27e
JB		 545 chan->flags & IEEE80211_CHAN_NO_IBSS))
546 skip = 1;
547
548 if (!skip) {
549 local->scan_channel = chan;
e8975581
JB		 550 if (ieee80211_hw_config(local,
551 IEEE80211_CONF_CHANGE_CHANNEL))
0a51b27e 552 skip = 1;
0a51b27e
JB		 553 }
554
555 /* advance state machine to next channel/band */
556 local->scan_channel_idx++;
557 if (local->scan_channel_idx >= sband->n_channels) {
558 /*
559 * scan_band may end up == IEEE80211_NUM_BANDS, but
560 * we'll catch that case above and complete the scan
561 * if that is the case.
562 */
563 local->scan_band++;
564 local->scan_channel_idx = 0;
565 }
566
567 if (skip)
568 break;
569
570 next_delay = IEEE80211_PROBE_DELAY +
571 usecs_to_jiffies(local->hw.channel_change_time);
572 local->scan_state = SCAN_SEND_PROBE;
573 break;
574 case SCAN_SEND_PROBE:
575 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
576 local->scan_state = SCAN_SET_CHANNEL;
577
578 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
579 break;
580 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
581 local->scan_ssid_len);
582 next_delay = IEEE80211_CHANNEL_TIME;
583 break;
584 }
585
5bc75728
JB		 586 queue_delayed_work(local->hw.workqueue, &local->scan_work,
587 next_delay);
0a51b27e
JB		 588}
589
590
c2b13452
JB		 591int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
592 u8 *ssid, size_t ssid_len)
0a51b27e
JB		 593{
594 struct ieee80211_local *local = scan_sdata->local;
595 struct ieee80211_sub_if_data *sdata;
596
597 if (ssid_len > IEEE80211_MAX_SSID_LEN)
598 return -EINVAL;
599
600 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
601 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
602 * BSSID: MACAddress
603 * SSID
604 * ScanType: ACTIVE, PASSIVE
605 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
606 * a Probe frame during active scanning
607 * ChannelList
608 * MinChannelTime (>= ProbeDelay), in TU
609 * MaxChannelTime: (>= MinChannelTime), in TU
610 */
611
612 /* MLME-SCAN.confirm
613 * BSSDescriptionSet
614 * ResultCode: SUCCESS, INVALID_PARAMETERS
615 */
616
c2b13452 617 if (local->sw_scanning || local->hw_scanning) {
0a51b27e
JB		 618 if (local->scan_sdata == scan_sdata)
619 return 0;
620 return -EBUSY;
621 }
622
623 if (local->ops->hw_scan) {
5bc75728
JB		 624 int rc;
625
c2b13452 626 local->hw_scanning = true;
5bc75728
JB		 627 rc = local->ops->hw_scan(local_to_hw(local), ssid, ssid_len);
628 if (rc) {
c2b13452 629 local->hw_scanning = false;
5bc75728 630 return rc;
0a51b27e 631 }
5bc75728
JB		 632 local->scan_sdata = scan_sdata;
633 return 0;
0a51b27e
JB		 634 }
635
c2b13452 636 local->sw_scanning = true;
0a51b27e 637
078e1e60
JB		 638 mutex_lock(&local->iflist_mtx);
639 list_for_each_entry(sdata, &local->interfaces, list) {
640 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON_ENABLED);
641
05c914fe 642 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
0a51b27e
JB		 643 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
644 netif_tx_stop_all_queues(sdata->dev);
645 ieee80211_send_nullfunc(local, sdata, 1);
646 }
647 } else
648 netif_tx_stop_all_queues(sdata->dev);
649 }
078e1e60 650 mutex_unlock(&local->iflist_mtx);
0a51b27e
JB		 651
652 if (ssid) {
653 local->scan_ssid_len = ssid_len;
654 memcpy(local->scan_ssid, ssid, ssid_len);
655 } else
656 local->scan_ssid_len = 0;
657 local->scan_state = SCAN_SET_CHANNEL;
658 local->scan_channel_idx = 0;
659 local->scan_band = IEEE80211_BAND_2GHZ;
660 local->scan_sdata = scan_sdata;
661
662 netif_addr_lock_bh(local->mdev);
663 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
664 local->ops->configure_filter(local_to_hw(local),
665 FIF_BCN_PRBRESP_PROMISC,
666 &local->filter_flags,
667 local->mdev->mc_count,
668 local->mdev->mc_list);
669 netif_addr_unlock_bh(local->mdev);
670
671 /* TODO: start scan as soon as all nullfunc frames are ACKed */
672 queue_delayed_work(local->hw.workqueue, &local->scan_work,
673 IEEE80211_CHANNEL_TIME);
674
675 return 0;
676}
677
678
c2b13452
JB		 679int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
680 u8 *ssid, size_t ssid_len)
0a51b27e 681{
0a51b27e 682 struct ieee80211_local *local = sdata->local;
9116dd01 683 struct ieee80211_if_sta *ifsta;
0a51b27e 684
05c914fe 685 if (sdata->vif.type != NL80211_IFTYPE_STATION)
c2b13452 686 return ieee80211_start_scan(sdata, ssid, ssid_len);
0a51b27e 687
9116dd01
JB		 688 /*
689 * STA has a state machine that might need to defer scanning
690 * while it's trying to associate/authenticate, therefore we
691 * queue it up to the state machine in that case.
692 */
693
c2b13452 694 if (local->sw_scanning || local->hw_scanning) {
0a51b27e
JB		 695 if (local->scan_sdata == sdata)
696 return 0;
697 return -EBUSY;
698 }
699
9116dd01
JB		 700 ifsta = &sdata->u.sta;
701
0a51b27e
JB		 702 ifsta->scan_ssid_len = ssid_len;
703 if (ssid_len)
704 memcpy(ifsta->scan_ssid, ssid, ssid_len);
705 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
706 queue_work(local->hw.workqueue, &ifsta->work);
9116dd01 707
0a51b27e
JB		 708 return 0;
709}
710
711
c2b13452
JB		 712static void ieee80211_scan_add_ies(struct iw_request_info *info,
713 struct ieee80211_bss *bss,
714 char **current_ev, char *end_buf)
0a51b27e
JB		 715{
716 u8 *pos, *end, *next;
717 struct iw_event iwe;
718
719 if (bss == NULL || bss->ies == NULL)
720 return;
721
722 /*
723 * If needed, fragment the IEs buffer (at IE boundaries) into short
724 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
725 */
726 pos = bss->ies;
727 end = pos + bss->ies_len;
728
729 while (end - pos > IW_GENERIC_IE_MAX) {
730 next = pos + 2 + pos[1];
731 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
732 next = next + 2 + next[1];
733
734 memset(&iwe, 0, sizeof(iwe));
735 iwe.cmd = IWEVGENIE;
736 iwe.u.data.length = next - pos;
737 *current_ev = iwe_stream_add_point(info, *current_ev,
738 end_buf, &iwe, pos);
739
740 pos = next;
741 }
742
743 if (end > pos) {
744 memset(&iwe, 0, sizeof(iwe));
745 iwe.cmd = IWEVGENIE;
746 iwe.u.data.length = end - pos;
747 *current_ev = iwe_stream_add_point(info, *current_ev,
748 end_buf, &iwe, pos);
749 }
750}
751
752
753static char *
c2b13452
JB		 754ieee80211_scan_result(struct ieee80211_local *local,
755 struct iw_request_info *info,
756 struct ieee80211_bss *bss,
757 char *current_ev, char *end_buf)
0a51b27e
JB		 758{
759 struct iw_event iwe;
760 char *buf;
761
762 if (time_after(jiffies,
763 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
764 return current_ev;
765
766 memset(&iwe, 0, sizeof(iwe));
767 iwe.cmd = SIOCGIWAP;
768 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
769 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
770 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
771 IW_EV_ADDR_LEN);
772
773 memset(&iwe, 0, sizeof(iwe));
774 iwe.cmd = SIOCGIWESSID;
775 if (bss_mesh_cfg(bss)) {
776 iwe.u.data.length = bss_mesh_id_len(bss);
777 iwe.u.data.flags = 1;
778 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
779 &iwe, bss_mesh_id(bss));
780 } else {
781 iwe.u.data.length = bss->ssid_len;
782 iwe.u.data.flags = 1;
783 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
784 &iwe, bss->ssid);
785 }
786
787 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
788 || bss_mesh_cfg(bss)) {
789 memset(&iwe, 0, sizeof(iwe));
790 iwe.cmd = SIOCGIWMODE;
791 if (bss_mesh_cfg(bss))
792 iwe.u.mode = IW_MODE_MESH;
793 else if (bss->capability & WLAN_CAPABILITY_ESS)
794 iwe.u.mode = IW_MODE_MASTER;
795 else
796 iwe.u.mode = IW_MODE_ADHOC;
797 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
798 &iwe, IW_EV_UINT_LEN);
799 }
800
801 memset(&iwe, 0, sizeof(iwe));
802 iwe.cmd = SIOCGIWFREQ;
803 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
804 iwe.u.freq.e = 0;
805 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
806 IW_EV_FREQ_LEN);
807
808 memset(&iwe, 0, sizeof(iwe));
809 iwe.cmd = SIOCGIWFREQ;
810 iwe.u.freq.m = bss->freq;
811 iwe.u.freq.e = 6;
812 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
813 IW_EV_FREQ_LEN);
814 memset(&iwe, 0, sizeof(iwe));
815 iwe.cmd = IWEVQUAL;
816 iwe.u.qual.qual = bss->qual;
817 iwe.u.qual.level = bss->signal;
818 iwe.u.qual.noise = bss->noise;
819 iwe.u.qual.updated = local->wstats_flags;
820 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
821 IW_EV_QUAL_LEN);
822
823 memset(&iwe, 0, sizeof(iwe));
824 iwe.cmd = SIOCGIWENCODE;
825 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
826 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
827 else
828 iwe.u.data.flags = IW_ENCODE_DISABLED;
829 iwe.u.data.length = 0;
830 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
831 &iwe, "");
832
c2b13452 833 ieee80211_scan_add_ies(info, bss, &current_ev, end_buf);
0a51b27e
JB		 834
835 if (bss->supp_rates_len > 0) {
836 /* display all supported rates in readable format */
837 char *p = current_ev + iwe_stream_lcp_len(info);
838 int i;
839
840 memset(&iwe, 0, sizeof(iwe));
841 iwe.cmd = SIOCGIWRATE;
842 /* Those two flags are ignored... */
843 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
844
845 for (i = 0; i < bss->supp_rates_len; i++) {
846 iwe.u.bitrate.value = ((bss->supp_rates[i] &
847 0x7f) * 500000);
848 p = iwe_stream_add_value(info, current_ev, p,
849 end_buf, &iwe, IW_EV_PARAM_LEN);
850 }
851 current_ev = p;
852 }
853
854 buf = kmalloc(30, GFP_ATOMIC);
855 if (buf) {
856 memset(&iwe, 0, sizeof(iwe));
857 iwe.cmd = IWEVCUSTOM;
858 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
859 iwe.u.data.length = strlen(buf);
860 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
861 &iwe, buf);
862 memset(&iwe, 0, sizeof(iwe));
863 iwe.cmd = IWEVCUSTOM;
864 sprintf(buf, " Last beacon: %dms ago",
865 jiffies_to_msecs(jiffies - bss->last_update));
866 iwe.u.data.length = strlen(buf);
867 current_ev = iwe_stream_add_point(info, current_ev,
868 end_buf, &iwe, buf);
869 kfree(buf);
870 }
871
872 if (bss_mesh_cfg(bss)) {
873 u8 *cfg = bss_mesh_cfg(bss);
874 buf = kmalloc(50, GFP_ATOMIC);
875 if (buf) {
876 memset(&iwe, 0, sizeof(iwe));
877 iwe.cmd = IWEVCUSTOM;
878 sprintf(buf, "Mesh network (version %d)", cfg[0]);
879 iwe.u.data.length = strlen(buf);
880 current_ev = iwe_stream_add_point(info, current_ev,
881 end_buf,
882 &iwe, buf);
883 sprintf(buf, "Path Selection Protocol ID: "
884 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
885 cfg[4]);
886 iwe.u.data.length = strlen(buf);
887 current_ev = iwe_stream_add_point(info, current_ev,
888 end_buf,
889 &iwe, buf);
890 sprintf(buf, "Path Selection Metric ID: "
891 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
892 cfg[8]);
893 iwe.u.data.length = strlen(buf);
894 current_ev = iwe_stream_add_point(info, current_ev,
895 end_buf,
896 &iwe, buf);
897 sprintf(buf, "Congestion Control Mode ID: "
898 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
899 cfg[11], cfg[12]);
900 iwe.u.data.length = strlen(buf);
901 current_ev = iwe_stream_add_point(info, current_ev,
902 end_buf,
903 &iwe, buf);
904 sprintf(buf, "Channel Precedence: "
905 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
906 cfg[15], cfg[16]);
907 iwe.u.data.length = strlen(buf);
908 current_ev = iwe_stream_add_point(info, current_ev,
909 end_buf,
910 &iwe, buf);
911 kfree(buf);
912 }
913 }
914
915 return current_ev;
916}
917
918
c2b13452
JB		 919int ieee80211_scan_results(struct ieee80211_local *local,
920 struct iw_request_info *info,
921 char *buf, size_t len)
0a51b27e
JB		 922{
923 char *current_ev = buf;
924 char *end_buf = buf + len;
c2b13452 925 struct ieee80211_bss *bss;
0a51b27e 926
c2b13452
JB		 927 spin_lock_bh(&local->bss_lock);
928 list_for_each_entry(bss, &local->bss_list, list) {
0a51b27e 929 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
c2b13452 930 spin_unlock_bh(&local->bss_lock);
0a51b27e
JB		 931 return -E2BIG;
932 }
c2b13452 933 current_ev = ieee80211_scan_result(local, info, bss,
0a51b27e
JB		 934 current_ev, end_buf);
935 }
c2b13452 936 spin_unlock_bh(&local->bss_lock);
0a51b27e
JB		 937 return current_ev - buf;
938}
kernel source for telekom puls (alcatel/mediatek)