Commit | Line | Data |
---|---|---|
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 | ||
00d3f14c | 15 | /* TODO: figure out how to avoid that the "current BSS" expires */ |
5484e237 | 16 | |
0a51b27e JB |
17 | #include <linux/wireless.h> |
18 | #include <linux/if_arp.h> | |
078e1e60 | 19 | #include <linux/rtnetlink.h> |
0a51b27e JB |
20 | #include <net/mac80211.h> |
21 | #include <net/iw_handler.h> | |
22 | ||
23 | #include "ieee80211_i.h" | |
5484e237 | 24 | #include "mesh.h" |
0a51b27e JB |
25 | |
26 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
27 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
28 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5) | |
29 | ||
c2b13452 | 30 | struct ieee80211_bss * |
5484e237 JB |
31 | ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, |
32 | u8 *ssid, u8 ssid_len) | |
33 | { | |
00d3f14c JB |
34 | return (void *)cfg80211_get_bss(local->hw.wiphy, |
35 | ieee80211_get_channel(local->hw.wiphy, | |
36 | freq), | |
37 | bssid, ssid, ssid_len, | |
38 | 0, 0); | |
5484e237 JB |
39 | } |
40 | ||
00d3f14c | 41 | static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) |
5484e237 | 42 | { |
00d3f14c | 43 | struct ieee80211_bss *bss = (void *)cbss; |
5484e237 | 44 | |
5484e237 JB |
45 | kfree(bss_mesh_id(bss)); |
46 | kfree(bss_mesh_cfg(bss)); | |
5484e237 JB |
47 | } |
48 | ||
49 | void ieee80211_rx_bss_put(struct ieee80211_local *local, | |
c2b13452 | 50 | struct ieee80211_bss *bss) |
5484e237 | 51 | { |
00d3f14c | 52 | cfg80211_put_bss((struct cfg80211_bss *)bss); |
5484e237 JB |
53 | } |
54 | ||
c2b13452 | 55 | struct ieee80211_bss * |
5484e237 JB |
56 | ieee80211_bss_info_update(struct ieee80211_local *local, |
57 | struct ieee80211_rx_status *rx_status, | |
58 | struct ieee80211_mgmt *mgmt, | |
59 | size_t len, | |
60 | struct ieee802_11_elems *elems, | |
2a519311 JB |
61 | struct ieee80211_channel *channel, |
62 | bool beacon) | |
5484e237 | 63 | { |
c2b13452 | 64 | struct ieee80211_bss *bss; |
00d3f14c | 65 | int clen; |
2a519311 JB |
66 | s32 signal = 0; |
67 | ||
77965c97 | 68 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 69 | signal = rx_status->signal * 100; |
77965c97 | 70 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 71 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 72 | |
00d3f14c | 73 | bss = (void *)cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
77965c97 | 74 | mgmt, len, signal, GFP_ATOMIC); |
5484e237 | 75 | |
00d3f14c JB |
76 | if (!bss) |
77 | return NULL; | |
78 | ||
79 | bss->cbss.free_priv = ieee80211_rx_bss_free; | |
5484e237 JB |
80 | |
81 | /* save the ERP value so that it is available at association time */ | |
82 | if (elems->erp_info && elems->erp_info_len >= 1) { | |
83 | bss->erp_value = elems->erp_info[0]; | |
84 | bss->has_erp_value = 1; | |
85 | } | |
86 | ||
5484e237 JB |
87 | if (elems->tim) { |
88 | struct ieee80211_tim_ie *tim_ie = | |
89 | (struct ieee80211_tim_ie *)elems->tim; | |
90 | bss->dtim_period = tim_ie->dtim_period; | |
91 | } | |
92 | ||
93 | /* set default value for buggy APs */ | |
94 | if (!elems->tim || bss->dtim_period == 0) | |
95 | bss->dtim_period = 1; | |
96 | ||
97 | bss->supp_rates_len = 0; | |
98 | if (elems->supp_rates) { | |
99 | clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; | |
100 | if (clen > elems->supp_rates_len) | |
101 | clen = elems->supp_rates_len; | |
102 | memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates, | |
103 | clen); | |
104 | bss->supp_rates_len += clen; | |
105 | } | |
106 | if (elems->ext_supp_rates) { | |
107 | clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; | |
108 | if (clen > elems->ext_supp_rates_len) | |
109 | clen = elems->ext_supp_rates_len; | |
110 | memcpy(&bss->supp_rates[bss->supp_rates_len], | |
111 | elems->ext_supp_rates, clen); | |
112 | bss->supp_rates_len += clen; | |
113 | } | |
114 | ||
5484e237 JB |
115 | bss->wmm_used = elems->wmm_param || elems->wmm_info; |
116 | ||
117 | if (!beacon) | |
118 | bss->last_probe_resp = jiffies; | |
119 | ||
5484e237 JB |
120 | return bss; |
121 | } | |
0a51b27e | 122 | |
7a947080 VT |
123 | void ieee80211_rx_bss_remove(struct ieee80211_sub_if_data *sdata, u8 *bssid, |
124 | int freq, u8 *ssid, u8 ssid_len) | |
125 | { | |
126 | struct ieee80211_bss *bss; | |
127 | struct ieee80211_local *local = sdata->local; | |
128 | ||
129 | bss = ieee80211_rx_bss_get(local, bssid, freq, ssid, ssid_len); | |
130 | if (bss) { | |
00d3f14c | 131 | cfg80211_unlink_bss(local->hw.wiphy, (void *)bss); |
7a947080 VT |
132 | ieee80211_rx_bss_put(local, bss); |
133 | } | |
134 | } | |
135 | ||
98c8fccf | 136 | ieee80211_rx_result |
c2b13452 JB |
137 | ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, |
138 | struct ieee80211_rx_status *rx_status) | |
98c8fccf JB |
139 | { |
140 | struct ieee80211_mgmt *mgmt; | |
c2b13452 | 141 | struct ieee80211_bss *bss; |
98c8fccf JB |
142 | u8 *elements; |
143 | struct ieee80211_channel *channel; | |
144 | size_t baselen; | |
145 | int freq; | |
146 | __le16 fc; | |
147 | bool presp, beacon = false; | |
148 | struct ieee802_11_elems elems; | |
149 | ||
150 | if (skb->len < 2) | |
151 | return RX_DROP_UNUSABLE; | |
152 | ||
153 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
154 | fc = mgmt->frame_control; | |
155 | ||
156 | if (ieee80211_is_ctl(fc)) | |
157 | return RX_CONTINUE; | |
158 | ||
159 | if (skb->len < 24) | |
160 | return RX_DROP_MONITOR; | |
161 | ||
162 | presp = ieee80211_is_probe_resp(fc); | |
163 | if (presp) { | |
164 | /* ignore ProbeResp to foreign address */ | |
165 | if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) | |
166 | return RX_DROP_MONITOR; | |
167 | ||
168 | presp = true; | |
169 | elements = mgmt->u.probe_resp.variable; | |
170 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
171 | } else { | |
172 | beacon = ieee80211_is_beacon(fc); | |
173 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); | |
174 | elements = mgmt->u.beacon.variable; | |
175 | } | |
176 | ||
177 | if (!presp && !beacon) | |
178 | return RX_CONTINUE; | |
179 | ||
180 | if (baselen > skb->len) | |
181 | return RX_DROP_MONITOR; | |
182 | ||
183 | ieee802_11_parse_elems(elements, skb->len - baselen, &elems); | |
184 | ||
185 | if (elems.ds_params && elems.ds_params_len == 1) | |
186 | freq = ieee80211_channel_to_frequency(elems.ds_params[0]); | |
187 | else | |
188 | freq = rx_status->freq; | |
189 | ||
190 | channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); | |
191 | ||
192 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
193 | return RX_DROP_MONITOR; | |
194 | ||
195 | bss = ieee80211_bss_info_update(sdata->local, rx_status, | |
196 | mgmt, skb->len, &elems, | |
2a519311 | 197 | channel, beacon); |
d048e503 JM |
198 | if (bss) |
199 | ieee80211_rx_bss_put(sdata->local, bss); | |
98c8fccf JB |
200 | |
201 | dev_kfree_skb(skb); | |
202 | return RX_QUEUED; | |
203 | } | |
204 | ||
9050bdd8 KV |
205 | /* |
206 | * inform AP that we will go to sleep so that it will buffer the frames | |
207 | * while we scan | |
208 | */ | |
209 | static void ieee80211_scan_ps_enable(struct ieee80211_sub_if_data *sdata) | |
210 | { | |
211 | struct ieee80211_local *local = sdata->local; | |
212 | bool ps = false; | |
213 | ||
214 | /* FIXME: what to do when local->pspolling is true? */ | |
215 | ||
216 | del_timer_sync(&local->dynamic_ps_timer); | |
217 | cancel_work_sync(&local->dynamic_ps_enable_work); | |
218 | ||
219 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { | |
220 | ps = true; | |
221 | local->hw.conf.flags &= ~IEEE80211_CONF_PS; | |
222 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
223 | } | |
224 | ||
225 | if (!ps || !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) | |
226 | /* | |
227 | * If power save was enabled, no need to send a nullfunc | |
228 | * frame because AP knows that we are sleeping. But if the | |
229 | * hardware is creating the nullfunc frame for power save | |
230 | * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not | |
231 | * enabled) and power save was enabled, the firmware just | |
232 | * sent a null frame with power save disabled. So we need | |
233 | * to send a new nullfunc frame to inform the AP that we | |
234 | * are again sleeping. | |
235 | */ | |
236 | ieee80211_send_nullfunc(local, sdata, 1); | |
237 | } | |
238 | ||
239 | /* inform AP that we are awake again, unless power save is enabled */ | |
240 | static void ieee80211_scan_ps_disable(struct ieee80211_sub_if_data *sdata) | |
241 | { | |
242 | struct ieee80211_local *local = sdata->local; | |
243 | ||
965bedad | 244 | if (!local->ps_sdata) |
9050bdd8 KV |
245 | ieee80211_send_nullfunc(local, sdata, 0); |
246 | else { | |
247 | /* | |
248 | * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware | |
249 | * will send a nullfunc frame with the powersave bit set | |
250 | * even though the AP already knows that we are sleeping. | |
251 | * This could be avoided by sending a null frame with power | |
252 | * save bit disabled before enabling the power save, but | |
253 | * this doesn't gain anything. | |
254 | * | |
255 | * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need | |
256 | * to send a nullfunc frame because AP already knows that | |
257 | * we are sleeping, let's just enable power save mode in | |
258 | * hardware. | |
259 | */ | |
260 | local->hw.conf.flags |= IEEE80211_CONF_PS; | |
261 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
262 | } | |
263 | } | |
264 | ||
f3b85252 JB |
265 | static void ieee80211_restore_scan_ies(struct ieee80211_local *local) |
266 | { | |
267 | kfree(local->scan_req->ie); | |
268 | local->scan_req->ie = local->orig_ies; | |
269 | local->scan_req->ie_len = local->orig_ies_len; | |
270 | } | |
271 | ||
2a519311 | 272 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
273 | { |
274 | struct ieee80211_local *local = hw_to_local(hw); | |
275 | struct ieee80211_sub_if_data *sdata; | |
f3b85252 | 276 | bool was_hw_scan; |
0a51b27e | 277 | |
f3b85252 | 278 | mutex_lock(&local->scan_mtx); |
5bc75728 | 279 | |
f3b85252 JB |
280 | if (WARN_ON(!local->hw_scanning && !local->sw_scanning)) { |
281 | mutex_unlock(&local->scan_mtx); | |
2a519311 | 282 | return; |
f3b85252 | 283 | } |
5bc75728 | 284 | |
f3b85252 JB |
285 | if (WARN_ON(!local->scan_req)) { |
286 | mutex_unlock(&local->scan_mtx); | |
287 | return; | |
de95a54b JB |
288 | } |
289 | ||
f3b85252 JB |
290 | if (local->hw_scanning) |
291 | ieee80211_restore_scan_ies(local); | |
292 | ||
2a519311 JB |
293 | if (local->scan_req != &local->int_scan_req) |
294 | cfg80211_scan_done(local->scan_req, aborted); | |
295 | local->scan_req = NULL; | |
296 | ||
f3b85252 JB |
297 | was_hw_scan = local->hw_scanning; |
298 | local->hw_scanning = false; | |
299 | local->sw_scanning = false; | |
300 | ||
301 | /* we only have to protect scan_req and hw/sw scan */ | |
302 | mutex_unlock(&local->scan_mtx); | |
303 | ||
304 | if (was_hw_scan) { | |
e8975581 JB |
305 | /* |
306 | * Somebody might have requested channel change during scan | |
307 | * that we won't have acted upon, try now. ieee80211_hw_config | |
308 | * will set the flag based on actual changes. | |
309 | */ | |
310 | ieee80211_hw_config(local, 0); | |
0a51b27e JB |
311 | goto done; |
312 | } | |
313 | ||
e8975581 | 314 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
0a51b27e JB |
315 | |
316 | netif_tx_lock_bh(local->mdev); | |
317 | netif_addr_lock(local->mdev); | |
318 | local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC; | |
319 | local->ops->configure_filter(local_to_hw(local), | |
320 | FIF_BCN_PRBRESP_PROMISC, | |
321 | &local->filter_flags, | |
322 | local->mdev->mc_count, | |
323 | local->mdev->mc_list); | |
324 | ||
325 | netif_addr_unlock(local->mdev); | |
326 | netif_tx_unlock_bh(local->mdev); | |
327 | ||
80e775bf MB |
328 | if (local->ops->sw_scan_complete) |
329 | local->ops->sw_scan_complete(local_to_hw(local)); | |
330 | ||
078e1e60 JB |
331 | mutex_lock(&local->iflist_mtx); |
332 | list_for_each_entry(sdata, &local->interfaces, list) { | |
fb9ddbf0 JB |
333 | if (!netif_running(sdata->dev)) |
334 | continue; | |
335 | ||
0a51b27e | 336 | /* Tell AP we're back */ |
05c914fe | 337 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
46900298 | 338 | if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED) { |
9050bdd8 | 339 | ieee80211_scan_ps_disable(sdata); |
0a51b27e JB |
340 | netif_tx_wake_all_queues(sdata->dev); |
341 | } | |
342 | } else | |
343 | netif_tx_wake_all_queues(sdata->dev); | |
078e1e60 | 344 | |
14b80724 JB |
345 | /* re-enable beaconing */ |
346 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
347 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
348 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
349 | ieee80211_if_config(sdata, | |
350 | IEEE80211_IFCC_BEACON_ENABLED); | |
0a51b27e | 351 | } |
078e1e60 | 352 | mutex_unlock(&local->iflist_mtx); |
0a51b27e JB |
353 | |
354 | done: | |
355 | ieee80211_mlme_notify_scan_completed(local); | |
46900298 | 356 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 357 | ieee80211_mesh_notify_scan_completed(local); |
0a51b27e JB |
358 | } |
359 | EXPORT_SYMBOL(ieee80211_scan_completed); | |
360 | ||
f3b85252 JB |
361 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
362 | { | |
363 | struct ieee80211_sub_if_data *sdata; | |
364 | ||
365 | /* | |
366 | * Hardware/driver doesn't support hw_scan, so use software | |
367 | * scanning instead. First send a nullfunc frame with power save | |
368 | * bit on so that AP will buffer the frames for us while we are not | |
369 | * listening, then send probe requests to each channel and wait for | |
370 | * the responses. After all channels are scanned, tune back to the | |
371 | * original channel and send a nullfunc frame with power save bit | |
372 | * off to trigger the AP to send us all the buffered frames. | |
373 | * | |
374 | * Note that while local->sw_scanning is true everything else but | |
375 | * nullfunc frames and probe requests will be dropped in | |
376 | * ieee80211_tx_h_check_assoc(). | |
377 | */ | |
378 | if (local->ops->sw_scan_start) | |
379 | local->ops->sw_scan_start(local_to_hw(local)); | |
380 | ||
381 | mutex_lock(&local->iflist_mtx); | |
382 | list_for_each_entry(sdata, &local->interfaces, list) { | |
383 | if (!netif_running(sdata->dev)) | |
384 | continue; | |
385 | ||
386 | /* disable beaconing */ | |
387 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
388 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
389 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
390 | ieee80211_if_config(sdata, | |
391 | IEEE80211_IFCC_BEACON_ENABLED); | |
392 | ||
393 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
394 | if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED) { | |
395 | netif_tx_stop_all_queues(sdata->dev); | |
396 | ieee80211_scan_ps_enable(sdata); | |
397 | } | |
398 | } else | |
399 | netif_tx_stop_all_queues(sdata->dev); | |
400 | } | |
401 | mutex_unlock(&local->iflist_mtx); | |
402 | ||
403 | local->scan_state = SCAN_SET_CHANNEL; | |
404 | local->scan_channel_idx = 0; | |
405 | ||
406 | netif_addr_lock_bh(local->mdev); | |
407 | local->filter_flags |= FIF_BCN_PRBRESP_PROMISC; | |
408 | local->ops->configure_filter(local_to_hw(local), | |
409 | FIF_BCN_PRBRESP_PROMISC, | |
410 | &local->filter_flags, | |
411 | local->mdev->mc_count, | |
412 | local->mdev->mc_list); | |
413 | netif_addr_unlock_bh(local->mdev); | |
414 | ||
415 | /* TODO: start scan as soon as all nullfunc frames are ACKed */ | |
416 | queue_delayed_work(local->hw.workqueue, &local->scan_work, | |
417 | IEEE80211_CHANNEL_TIME); | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
422 | ||
423 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, | |
424 | struct cfg80211_scan_request *req) | |
425 | { | |
426 | struct ieee80211_local *local = sdata->local; | |
427 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; | |
428 | int rc; | |
429 | ||
430 | if (local->scan_req) | |
431 | return -EBUSY; | |
432 | ||
433 | if (local->ops->hw_scan) { | |
434 | u8 *ies; | |
435 | int ielen; | |
436 | ||
437 | ies = kmalloc(2 + IEEE80211_MAX_SSID_LEN + | |
438 | local->scan_ies_len + req->ie_len, GFP_KERNEL); | |
439 | if (!ies) | |
440 | return -ENOMEM; | |
441 | ||
442 | ielen = ieee80211_build_preq_ies(local, ies, | |
443 | req->ie, req->ie_len); | |
444 | local->orig_ies = req->ie; | |
445 | local->orig_ies_len = req->ie_len; | |
446 | req->ie = ies; | |
447 | req->ie_len = ielen; | |
448 | } | |
449 | ||
450 | local->scan_req = req; | |
451 | local->scan_sdata = sdata; | |
452 | ||
453 | if (req != &local->int_scan_req && | |
454 | sdata->vif.type == NL80211_IFTYPE_STATION && | |
455 | (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE || | |
456 | ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE || | |
457 | ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE)) { | |
458 | /* actually wait for the assoc to finish/time out */ | |
459 | set_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request); | |
460 | return 0; | |
461 | } | |
462 | ||
463 | if (local->ops->hw_scan) | |
464 | local->hw_scanning = true; | |
465 | else | |
466 | local->sw_scanning = true; | |
467 | /* | |
468 | * Kicking off the scan need not be protected, | |
469 | * only the scan variable stuff, since now | |
470 | * local->scan_req is assigned and other callers | |
471 | * will abort their scan attempts. | |
472 | * | |
473 | * This avoids getting a scan_mtx -> iflist_mtx | |
474 | * dependency, so that the scan completed calls | |
475 | * have more locking freedom. | |
476 | */ | |
477 | mutex_unlock(&local->scan_mtx); | |
478 | ||
479 | if (local->ops->hw_scan) | |
480 | rc = local->ops->hw_scan(local_to_hw(local), | |
481 | local->scan_req); | |
482 | else | |
483 | rc = ieee80211_start_sw_scan(local); | |
484 | ||
485 | mutex_lock(&local->scan_mtx); | |
486 | ||
487 | if (rc) { | |
488 | if (local->ops->hw_scan) { | |
489 | local->hw_scanning = false; | |
490 | ieee80211_restore_scan_ies(local); | |
491 | } else | |
492 | local->sw_scanning = false; | |
493 | ||
494 | local->scan_req = NULL; | |
495 | local->scan_sdata = NULL; | |
496 | } | |
497 | ||
498 | return rc; | |
499 | } | |
500 | ||
c2b13452 | 501 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
502 | { |
503 | struct ieee80211_local *local = | |
504 | container_of(work, struct ieee80211_local, scan_work.work); | |
505 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; | |
0a51b27e | 506 | struct ieee80211_channel *chan; |
2a519311 | 507 | int skip, i; |
0a51b27e JB |
508 | unsigned long next_delay = 0; |
509 | ||
f3b85252 JB |
510 | mutex_lock(&local->scan_mtx); |
511 | if (!sdata || !local->scan_req) { | |
512 | mutex_unlock(&local->scan_mtx); | |
513 | return; | |
514 | } | |
515 | ||
516 | if (local->scan_req && !(local->sw_scanning || local->hw_scanning)) { | |
517 | struct cfg80211_scan_request *req = local->scan_req; | |
518 | int rc; | |
519 | ||
520 | local->scan_req = NULL; | |
521 | ||
522 | rc = __ieee80211_start_scan(sdata, req); | |
523 | mutex_unlock(&local->scan_mtx); | |
524 | ||
525 | if (rc) | |
526 | ieee80211_scan_completed(&local->hw, true); | |
527 | return; | |
528 | } | |
529 | ||
530 | mutex_unlock(&local->scan_mtx); | |
531 | ||
5bc75728 JB |
532 | /* |
533 | * Avoid re-scheduling when the sdata is going away. | |
534 | */ | |
f3b85252 JB |
535 | if (!netif_running(sdata->dev)) { |
536 | ieee80211_scan_completed(&local->hw, true); | |
0a51b27e | 537 | return; |
f3b85252 | 538 | } |
0a51b27e JB |
539 | |
540 | switch (local->scan_state) { | |
541 | case SCAN_SET_CHANNEL: | |
0a51b27e | 542 | /* if no more bands/channels left, complete scan */ |
2a519311 | 543 | if (local->scan_channel_idx >= local->scan_req->n_channels) { |
f3b85252 | 544 | ieee80211_scan_completed(&local->hw, false); |
0a51b27e JB |
545 | return; |
546 | } | |
547 | skip = 0; | |
2a519311 | 548 | chan = local->scan_req->channels[local->scan_channel_idx]; |
0a51b27e JB |
549 | |
550 | if (chan->flags & IEEE80211_CHAN_DISABLED || | |
05c914fe | 551 | (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
0a51b27e JB |
552 | chan->flags & IEEE80211_CHAN_NO_IBSS)) |
553 | skip = 1; | |
554 | ||
555 | if (!skip) { | |
556 | local->scan_channel = chan; | |
e8975581 JB |
557 | if (ieee80211_hw_config(local, |
558 | IEEE80211_CONF_CHANGE_CHANNEL)) | |
0a51b27e | 559 | skip = 1; |
0a51b27e JB |
560 | } |
561 | ||
562 | /* advance state machine to next channel/band */ | |
563 | local->scan_channel_idx++; | |
0a51b27e JB |
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 | ||
2a519311 JB |
576 | if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN || |
577 | !local->scan_req->n_ssids) | |
0a51b27e | 578 | break; |
2a519311 JB |
579 | for (i = 0; i < local->scan_req->n_ssids; i++) |
580 | ieee80211_send_probe_req( | |
581 | sdata, NULL, | |
582 | local->scan_req->ssids[i].ssid, | |
70692ad2 JM |
583 | local->scan_req->ssids[i].ssid_len, |
584 | local->scan_req->ie, local->scan_req->ie_len); | |
0a51b27e JB |
585 | next_delay = IEEE80211_CHANNEL_TIME; |
586 | break; | |
587 | } | |
588 | ||
5bc75728 JB |
589 | queue_delayed_work(local->hw.workqueue, &local->scan_work, |
590 | next_delay); | |
0a51b27e JB |
591 | } |
592 | ||
f3b85252 JB |
593 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
594 | struct cfg80211_scan_request *req) | |
0a51b27e | 595 | { |
f3b85252 | 596 | int res; |
de95a54b | 597 | |
f3b85252 JB |
598 | mutex_lock(&sdata->local->scan_mtx); |
599 | res = __ieee80211_start_scan(sdata, req); | |
600 | mutex_unlock(&sdata->local->scan_mtx); | |
0a51b27e | 601 | |
f3b85252 | 602 | return res; |
0a51b27e JB |
603 | } |
604 | ||
f3b85252 JB |
605 | int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, |
606 | const u8 *ssid, u8 ssid_len) | |
0a51b27e | 607 | { |
0a51b27e | 608 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 609 | int ret = -EBUSY; |
2a519311 | 610 | |
f3b85252 | 611 | mutex_lock(&local->scan_mtx); |
0a51b27e | 612 | |
f3b85252 JB |
613 | /* busy scanning */ |
614 | if (local->scan_req) | |
615 | goto unlock; | |
9116dd01 | 616 | |
f3b85252 JB |
617 | memcpy(local->int_scan_req.ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
618 | local->int_scan_req.ssids[0].ssid_len = ssid_len; | |
9116dd01 | 619 | |
f3b85252 JB |
620 | ret = __ieee80211_start_scan(sdata, &sdata->local->int_scan_req); |
621 | unlock: | |
622 | mutex_unlock(&local->scan_mtx); | |
623 | return ret; | |
0a51b27e | 624 | } |