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mac80211: kill hw.conf.antenna_sel_{rx,tx}
[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>
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{
c2b13452
JB		 35 spin_lock_init(&local->bss_lock);
36 INIT_LIST_HEAD(&local->bss_list);
5484e237
JB		 37}
38
39void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
40{
c2b13452 41 struct ieee80211_bss *bss, *tmp;
5484e237 42
c2b13452 43 list_for_each_entry_safe(bss, tmp, &local->bss_list, list)
5484e237
JB		 44 ieee80211_rx_bss_put(local, bss);
45}
46
c2b13452 47struct ieee80211_bss *
5484e237
JB		 48ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
49 u8 *ssid, u8 ssid_len)
50{
c2b13452 51 struct ieee80211_bss *bss;
5484e237 52
c2b13452
JB		 53 spin_lock_bh(&local->bss_lock);
54 bss = local->bss_hash[STA_HASH(bssid)];
5484e237
JB		 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 }
c2b13452 66 spin_unlock_bh(&local->bss_lock);
5484e237
JB		 67 return bss;
68}
69
c2b13452 70/* Caller must hold local->bss_lock */
5484e237 71static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
c2b13452 72 struct ieee80211_bss *bss)
5484e237
JB		 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
c2b13452
JB		 82 bss->hnext = local->bss_hash[hash_idx];
83 local->bss_hash[hash_idx] = bss;
5484e237
JB		 84}
85
c2b13452 86/* Caller must hold local->bss_lock */
5484e237 87static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
c2b13452 88 struct ieee80211_bss *bss)
5484e237 89{
c2b13452
JB		 90 struct ieee80211_bss *b, *prev = NULL;
91 b = local->bss_hash[STA_HASH(bss->bssid)];
5484e237
JB		 92 while (b) {
93 if (b == bss) {
94 if (!prev)
c2b13452 95 local->bss_hash[STA_HASH(bss->bssid)] =
5484e237
JB		 96 bss->hnext;
97 else
98 prev->hnext = bss->hnext;
99 break;
100 }
101 prev = b;
102 b = b->hnext;
103 }
104}
105
c2b13452 106struct ieee80211_bss *
5484e237
JB		 107ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
108 u8 *ssid, u8 ssid_len)
109{
c2b13452 110 struct ieee80211_bss *bss;
5484e237
JB		 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
c2b13452 123 spin_lock_bh(&local->bss_lock);
5484e237 124 /* TODO: order by RSSI? */
c2b13452 125 list_add_tail(&bss->list, &local->bss_list);
5484e237 126 __ieee80211_rx_bss_hash_add(local, bss);
c2b13452 127 spin_unlock_bh(&local->bss_lock);
5484e237
JB		 128 return bss;
129}
130
131#ifdef CONFIG_MAC80211_MESH
c2b13452 132static struct ieee80211_bss *
5484e237
JB		 133ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
134 u8 *mesh_cfg, int freq)
135{
c2b13452 136 struct ieee80211_bss *bss;
5484e237 137
c2b13452
JB		 138 spin_lock_bh(&local->bss_lock);
139 bss = local->bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
5484e237
JB		 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 }
c2b13452 152 spin_unlock_bh(&local->bss_lock);
5484e237
JB		 153 return bss;
154}
155
c2b13452 156static struct ieee80211_bss *
5484e237
JB		 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{
c2b13452 160 struct ieee80211_bss *bss;
5484e237
JB		 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;
c2b13452 189 spin_lock_bh(&local->bss_lock);
5484e237 190 /* TODO: order by RSSI? */
c2b13452 191 list_add_tail(&bss->list, &local->bss_list);
5484e237 192 __ieee80211_rx_bss_hash_add(local, bss);
c2b13452 193 spin_unlock_bh(&local->bss_lock);
5484e237
JB		 194 return bss;
195}
196#endif
197
c2b13452 198static void ieee80211_rx_bss_free(struct ieee80211_bss *bss)
5484e237
JB		 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,
c2b13452 207 struct ieee80211_bss *bss)
5484e237
JB		 208{
209 local_bh_disable();
c2b13452 210 if (!atomic_dec_and_lock(&bss->users, &local->bss_lock)) {
5484e237
JB		 211 local_bh_enable();
212 return;
213 }
214
215 __ieee80211_rx_bss_hash_del(local, bss);
216 list_del(&bss->list);
c2b13452 217 spin_unlock_bh(&local->bss_lock);
5484e237
JB		 218 ieee80211_rx_bss_free(bss);
219}
220
c2b13452 221struct ieee80211_bss *
5484e237
JB		 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{
c2b13452 229 struct ieee80211_bss *bss;
5484e237
JB		 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? */
c2b13452
JB		 255 spin_lock_bh(&local->bss_lock);
256 list_move_tail(&bss->list, &local->bss_list);
257 spin_unlock_bh(&local->bss_lock);
5484e237
JB		 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 329ieee80211_rx_result
c2b13452
JB		 330ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
331 struct ieee80211_rx_status *rx_status)
98c8fccf
JB		 332{
333 struct ieee80211_mgmt *mgmt;
c2b13452 334 struct ieee80211_bss *bss;
98c8fccf
JB		 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);
d048e503
JM		 391 if (bss)
392 ieee80211_rx_bss_put(sdata->local, bss);
98c8fccf
JB		 393
394 dev_kfree_skb(skb);
395 return RX_QUEUED;
396}
397
0a51b27e
JB		 398static 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
e50db65c 425 ieee80211_tx_skb(sdata, skb, 0);
0a51b27e
JB		 426}
427
0a51b27e
JB		 428void 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
c2b13452 434 if (WARN_ON(!local->hw_scanning && !local->sw_scanning))
5bc75728
JB		 435 return;
436
0a51b27e
JB		 437 local->last_scan_completed = jiffies;
438 memset(&wrqu, 0, sizeof(wrqu));
5bc75728
JB		 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);
0a51b27e 448
c2b13452
JB		 449 if (local->hw_scanning) {
450 local->hw_scanning = false;
d73782fd 451 ieee80211_hw_config(local);
0a51b27e
JB		 452 goto done;
453 }
454
c2b13452 455 local->sw_scanning = false;
d73782fd 456 ieee80211_hw_config(local);
0a51b27e
JB		 457
458 netif_tx_lock_bh(local->mdev);
459 netif_addr_lock(local->mdev);
460 local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
461 local->ops->configure_filter(local_to_hw(local),
462 FIF_BCN_PRBRESP_PROMISC,
463 &local->filter_flags,
464 local->mdev->mc_count,
465 local->mdev->mc_list);
466
467 netif_addr_unlock(local->mdev);
468 netif_tx_unlock_bh(local->mdev);
469
470 rcu_read_lock();
471 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
472 /* Tell AP we're back */
05c914fe 473 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
0a51b27e
JB		 474 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
475 ieee80211_send_nullfunc(local, sdata, 0);
476 netif_tx_wake_all_queues(sdata->dev);
477 }
478 } else
479 netif_tx_wake_all_queues(sdata->dev);
0a51b27e
JB		 480 }
481 rcu_read_unlock();
482
483 done:
484 ieee80211_mlme_notify_scan_completed(local);
472dbc45 485 ieee80211_mesh_notify_scan_completed(local);
0a51b27e
JB		 486}
487EXPORT_SYMBOL(ieee80211_scan_completed);
488
489
c2b13452 490void ieee80211_scan_work(struct work_struct *work)
0a51b27e
JB		 491{
492 struct ieee80211_local *local =
493 container_of(work, struct ieee80211_local, scan_work.work);
494 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
495 struct ieee80211_supported_band *sband;
496 struct ieee80211_channel *chan;
497 int skip;
498 unsigned long next_delay = 0;
499
5bc75728
JB		 500 /*
501 * Avoid re-scheduling when the sdata is going away.
502 */
503 if (!netif_running(sdata->dev))
0a51b27e
JB		 504 return;
505
506 switch (local->scan_state) {
507 case SCAN_SET_CHANNEL:
508 /*
509 * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
510 * after we successfully scanned the last channel of the last
511 * band (and the last band is supported by the hw)
512 */
513 if (local->scan_band < IEEE80211_NUM_BANDS)
514 sband = local->hw.wiphy->bands[local->scan_band];
515 else
516 sband = NULL;
517
518 /*
519 * If we are at an unsupported band and have more bands
520 * left to scan, advance to the next supported one.
521 */
522 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
523 local->scan_band++;
524 sband = local->hw.wiphy->bands[local->scan_band];
525 local->scan_channel_idx = 0;
526 }
527
528 /* if no more bands/channels left, complete scan */
529 if (!sband || local->scan_channel_idx >= sband->n_channels) {
530 ieee80211_scan_completed(local_to_hw(local));
531 return;
532 }
533 skip = 0;
534 chan = &sband->channels[local->scan_channel_idx];
535
536 if (chan->flags & IEEE80211_CHAN_DISABLED ||
05c914fe 537 (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
0a51b27e
JB		 538 chan->flags & IEEE80211_CHAN_NO_IBSS))
539 skip = 1;
540
541 if (!skip) {
542 local->scan_channel = chan;
d73782fd 543 if (ieee80211_hw_config(local))
0a51b27e 544 skip = 1;
0a51b27e
JB		 545 }
546
547 /* advance state machine to next channel/band */
548 local->scan_channel_idx++;
549 if (local->scan_channel_idx >= sband->n_channels) {
550 /*
551 * scan_band may end up == IEEE80211_NUM_BANDS, but
552 * we'll catch that case above and complete the scan
553 * if that is the case.
554 */
555 local->scan_band++;
556 local->scan_channel_idx = 0;
557 }
558
559 if (skip)
560 break;
561
562 next_delay = IEEE80211_PROBE_DELAY +
563 usecs_to_jiffies(local->hw.channel_change_time);
564 local->scan_state = SCAN_SEND_PROBE;
565 break;
566 case SCAN_SEND_PROBE:
567 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
568 local->scan_state = SCAN_SET_CHANNEL;
569
570 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
571 break;
572 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
573 local->scan_ssid_len);
574 next_delay = IEEE80211_CHANNEL_TIME;
575 break;
576 }
577
5bc75728
JB		 578 queue_delayed_work(local->hw.workqueue, &local->scan_work,
579 next_delay);
0a51b27e
JB		 580}
581
582
c2b13452
JB		 583int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
584 u8 *ssid, size_t ssid_len)
0a51b27e
JB		 585{
586 struct ieee80211_local *local = scan_sdata->local;
587 struct ieee80211_sub_if_data *sdata;
588
589 if (ssid_len > IEEE80211_MAX_SSID_LEN)
590 return -EINVAL;
591
592 /* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
593 * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
594 * BSSID: MACAddress
595 * SSID
596 * ScanType: ACTIVE, PASSIVE
597 * ProbeDelay: delay (in microseconds) to be used prior to transmitting
598 * a Probe frame during active scanning
599 * ChannelList
600 * MinChannelTime (>= ProbeDelay), in TU
601 * MaxChannelTime: (>= MinChannelTime), in TU
602 */
603
604 /* MLME-SCAN.confirm
605 * BSSDescriptionSet
606 * ResultCode: SUCCESS, INVALID_PARAMETERS
607 */
608
c2b13452 609 if (local->sw_scanning || local->hw_scanning) {
0a51b27e
JB		 610 if (local->scan_sdata == scan_sdata)
611 return 0;
612 return -EBUSY;
613 }
614
615 if (local->ops->hw_scan) {
5bc75728
JB		 616 int rc;
617
c2b13452 618 local->hw_scanning = true;
5bc75728
JB		 619 rc = local->ops->hw_scan(local_to_hw(local), ssid, ssid_len);
620 if (rc) {
c2b13452 621 local->hw_scanning = false;
5bc75728 622 return rc;
0a51b27e 623 }
5bc75728
JB		 624 local->scan_sdata = scan_sdata;
625 return 0;
0a51b27e
JB		 626 }
627
c2b13452 628 local->sw_scanning = true;
0a51b27e
JB		 629
630 rcu_read_lock();
631 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
05c914fe 632 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
0a51b27e
JB		 633 if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
634 netif_tx_stop_all_queues(sdata->dev);
635 ieee80211_send_nullfunc(local, sdata, 1);
636 }
637 } else
638 netif_tx_stop_all_queues(sdata->dev);
639 }
640 rcu_read_unlock();
641
642 if (ssid) {
643 local->scan_ssid_len = ssid_len;
644 memcpy(local->scan_ssid, ssid, ssid_len);
645 } else
646 local->scan_ssid_len = 0;
647 local->scan_state = SCAN_SET_CHANNEL;
648 local->scan_channel_idx = 0;
649 local->scan_band = IEEE80211_BAND_2GHZ;
650 local->scan_sdata = scan_sdata;
651
652 netif_addr_lock_bh(local->mdev);
653 local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
654 local->ops->configure_filter(local_to_hw(local),
655 FIF_BCN_PRBRESP_PROMISC,
656 &local->filter_flags,
657 local->mdev->mc_count,
658 local->mdev->mc_list);
659 netif_addr_unlock_bh(local->mdev);
660
661 /* TODO: start scan as soon as all nullfunc frames are ACKed */
662 queue_delayed_work(local->hw.workqueue, &local->scan_work,
663 IEEE80211_CHANNEL_TIME);
664
665 return 0;
666}
667
668
c2b13452
JB		 669int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
670 u8 *ssid, size_t ssid_len)
0a51b27e 671{
0a51b27e 672 struct ieee80211_local *local = sdata->local;
9116dd01 673 struct ieee80211_if_sta *ifsta;
0a51b27e 674
05c914fe 675 if (sdata->vif.type != NL80211_IFTYPE_STATION)
c2b13452 676 return ieee80211_start_scan(sdata, ssid, ssid_len);
0a51b27e 677
9116dd01
JB		 678 /*
679 * STA has a state machine that might need to defer scanning
680 * while it's trying to associate/authenticate, therefore we
681 * queue it up to the state machine in that case.
682 */
683
c2b13452 684 if (local->sw_scanning || local->hw_scanning) {
0a51b27e
JB		 685 if (local->scan_sdata == sdata)
686 return 0;
687 return -EBUSY;
688 }
689
9116dd01
JB		 690 ifsta = &sdata->u.sta;
691
0a51b27e
JB		 692 ifsta->scan_ssid_len = ssid_len;
693 if (ssid_len)
694 memcpy(ifsta->scan_ssid, ssid, ssid_len);
695 set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
696 queue_work(local->hw.workqueue, &ifsta->work);
9116dd01 697
0a51b27e
JB		 698 return 0;
699}
700
701
c2b13452
JB		 702static void ieee80211_scan_add_ies(struct iw_request_info *info,
703 struct ieee80211_bss *bss,
704 char **current_ev, char *end_buf)
0a51b27e
JB		 705{
706 u8 *pos, *end, *next;
707 struct iw_event iwe;
708
709 if (bss == NULL || bss->ies == NULL)
710 return;
711
712 /*
713 * If needed, fragment the IEs buffer (at IE boundaries) into short
714 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
715 */
716 pos = bss->ies;
717 end = pos + bss->ies_len;
718
719 while (end - pos > IW_GENERIC_IE_MAX) {
720 next = pos + 2 + pos[1];
721 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
722 next = next + 2 + next[1];
723
724 memset(&iwe, 0, sizeof(iwe));
725 iwe.cmd = IWEVGENIE;
726 iwe.u.data.length = next - pos;
727 *current_ev = iwe_stream_add_point(info, *current_ev,
728 end_buf, &iwe, pos);
729
730 pos = next;
731 }
732
733 if (end > pos) {
734 memset(&iwe, 0, sizeof(iwe));
735 iwe.cmd = IWEVGENIE;
736 iwe.u.data.length = end - pos;
737 *current_ev = iwe_stream_add_point(info, *current_ev,
738 end_buf, &iwe, pos);
739 }
740}
741
742
743static char *
c2b13452
JB		 744ieee80211_scan_result(struct ieee80211_local *local,
745 struct iw_request_info *info,
746 struct ieee80211_bss *bss,
747 char *current_ev, char *end_buf)
0a51b27e
JB		 748{
749 struct iw_event iwe;
750 char *buf;
751
752 if (time_after(jiffies,
753 bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
754 return current_ev;
755
756 memset(&iwe, 0, sizeof(iwe));
757 iwe.cmd = SIOCGIWAP;
758 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
759 memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
760 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
761 IW_EV_ADDR_LEN);
762
763 memset(&iwe, 0, sizeof(iwe));
764 iwe.cmd = SIOCGIWESSID;
765 if (bss_mesh_cfg(bss)) {
766 iwe.u.data.length = bss_mesh_id_len(bss);
767 iwe.u.data.flags = 1;
768 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
769 &iwe, bss_mesh_id(bss));
770 } else {
771 iwe.u.data.length = bss->ssid_len;
772 iwe.u.data.flags = 1;
773 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
774 &iwe, bss->ssid);
775 }
776
777 if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
778 || bss_mesh_cfg(bss)) {
779 memset(&iwe, 0, sizeof(iwe));
780 iwe.cmd = SIOCGIWMODE;
781 if (bss_mesh_cfg(bss))
782 iwe.u.mode = IW_MODE_MESH;
783 else if (bss->capability & WLAN_CAPABILITY_ESS)
784 iwe.u.mode = IW_MODE_MASTER;
785 else
786 iwe.u.mode = IW_MODE_ADHOC;
787 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
788 &iwe, IW_EV_UINT_LEN);
789 }
790
791 memset(&iwe, 0, sizeof(iwe));
792 iwe.cmd = SIOCGIWFREQ;
793 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
794 iwe.u.freq.e = 0;
795 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
796 IW_EV_FREQ_LEN);
797
798 memset(&iwe, 0, sizeof(iwe));
799 iwe.cmd = SIOCGIWFREQ;
800 iwe.u.freq.m = bss->freq;
801 iwe.u.freq.e = 6;
802 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
803 IW_EV_FREQ_LEN);
804 memset(&iwe, 0, sizeof(iwe));
805 iwe.cmd = IWEVQUAL;
806 iwe.u.qual.qual = bss->qual;
807 iwe.u.qual.level = bss->signal;
808 iwe.u.qual.noise = bss->noise;
809 iwe.u.qual.updated = local->wstats_flags;
810 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
811 IW_EV_QUAL_LEN);
812
813 memset(&iwe, 0, sizeof(iwe));
814 iwe.cmd = SIOCGIWENCODE;
815 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
816 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
817 else
818 iwe.u.data.flags = IW_ENCODE_DISABLED;
819 iwe.u.data.length = 0;
820 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
821 &iwe, "");
822
c2b13452 823 ieee80211_scan_add_ies(info, bss, &current_ev, end_buf);
0a51b27e
JB		 824
825 if (bss->supp_rates_len > 0) {
826 /* display all supported rates in readable format */
827 char *p = current_ev + iwe_stream_lcp_len(info);
828 int i;
829
830 memset(&iwe, 0, sizeof(iwe));
831 iwe.cmd = SIOCGIWRATE;
832 /* Those two flags are ignored... */
833 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
834
835 for (i = 0; i < bss->supp_rates_len; i++) {
836 iwe.u.bitrate.value = ((bss->supp_rates[i] &
837 0x7f) * 500000);
838 p = iwe_stream_add_value(info, current_ev, p,
839 end_buf, &iwe, IW_EV_PARAM_LEN);
840 }
841 current_ev = p;
842 }
843
844 buf = kmalloc(30, GFP_ATOMIC);
845 if (buf) {
846 memset(&iwe, 0, sizeof(iwe));
847 iwe.cmd = IWEVCUSTOM;
848 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
849 iwe.u.data.length = strlen(buf);
850 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
851 &iwe, buf);
852 memset(&iwe, 0, sizeof(iwe));
853 iwe.cmd = IWEVCUSTOM;
854 sprintf(buf, " Last beacon: %dms ago",
855 jiffies_to_msecs(jiffies - bss->last_update));
856 iwe.u.data.length = strlen(buf);
857 current_ev = iwe_stream_add_point(info, current_ev,
858 end_buf, &iwe, buf);
859 kfree(buf);
860 }
861
862 if (bss_mesh_cfg(bss)) {
863 u8 *cfg = bss_mesh_cfg(bss);
864 buf = kmalloc(50, GFP_ATOMIC);
865 if (buf) {
866 memset(&iwe, 0, sizeof(iwe));
867 iwe.cmd = IWEVCUSTOM;
868 sprintf(buf, "Mesh network (version %d)", cfg[0]);
869 iwe.u.data.length = strlen(buf);
870 current_ev = iwe_stream_add_point(info, current_ev,
871 end_buf,
872 &iwe, buf);
873 sprintf(buf, "Path Selection Protocol ID: "
874 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
875 cfg[4]);
876 iwe.u.data.length = strlen(buf);
877 current_ev = iwe_stream_add_point(info, current_ev,
878 end_buf,
879 &iwe, buf);
880 sprintf(buf, "Path Selection Metric ID: "
881 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
882 cfg[8]);
883 iwe.u.data.length = strlen(buf);
884 current_ev = iwe_stream_add_point(info, current_ev,
885 end_buf,
886 &iwe, buf);
887 sprintf(buf, "Congestion Control Mode ID: "
888 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
889 cfg[11], cfg[12]);
890 iwe.u.data.length = strlen(buf);
891 current_ev = iwe_stream_add_point(info, current_ev,
892 end_buf,
893 &iwe, buf);
894 sprintf(buf, "Channel Precedence: "
895 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
896 cfg[15], cfg[16]);
897 iwe.u.data.length = strlen(buf);
898 current_ev = iwe_stream_add_point(info, current_ev,
899 end_buf,
900 &iwe, buf);
901 kfree(buf);
902 }
903 }
904
905 return current_ev;
906}
907
908
c2b13452
JB		 909int ieee80211_scan_results(struct ieee80211_local *local,
910 struct iw_request_info *info,
911 char *buf, size_t len)
0a51b27e
JB		 912{
913 char *current_ev = buf;
914 char *end_buf = buf + len;
c2b13452 915 struct ieee80211_bss *bss;
0a51b27e 916
c2b13452
JB		 917 spin_lock_bh(&local->bss_lock);
918 list_for_each_entry(bss, &local->bss_list, list) {
0a51b27e 919 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
c2b13452 920 spin_unlock_bh(&local->bss_lock);
0a51b27e
JB		 921 return -E2BIG;
922 }
c2b13452 923 current_ev = ieee80211_scan_result(local, info, bss,
0a51b27e
JB		 924 current_ev, end_buf);
925 }
c2b13452 926 spin_unlock_bh(&local->bss_lock);
0a51b27e
JB		 927 return current_ev - buf;
928}
kernel source for telekom puls (alcatel/mediatek)