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Commit | Line | Data |
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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" | |
24487981 | 24 | #include "driver-ops.h" |
5484e237 | 25 | #include "mesh.h" |
0a51b27e JB |
26 | |
27 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
28 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
96f7e739 | 29 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) |
0a51b27e | 30 | |
c2b13452 | 31 | struct ieee80211_bss * |
5484e237 JB |
32 | ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, |
33 | u8 *ssid, u8 ssid_len) | |
34 | { | |
00d3f14c JB |
35 | return (void *)cfg80211_get_bss(local->hw.wiphy, |
36 | ieee80211_get_channel(local->hw.wiphy, | |
37 | freq), | |
38 | bssid, ssid, ssid_len, | |
39 | 0, 0); | |
5484e237 JB |
40 | } |
41 | ||
00d3f14c | 42 | static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) |
5484e237 | 43 | { |
00d3f14c | 44 | struct ieee80211_bss *bss = (void *)cbss; |
5484e237 | 45 | |
5484e237 JB |
46 | kfree(bss_mesh_id(bss)); |
47 | kfree(bss_mesh_cfg(bss)); | |
5484e237 JB |
48 | } |
49 | ||
50 | void ieee80211_rx_bss_put(struct ieee80211_local *local, | |
c2b13452 | 51 | struct ieee80211_bss *bss) |
5484e237 | 52 | { |
00d3f14c | 53 | cfg80211_put_bss((struct cfg80211_bss *)bss); |
5484e237 JB |
54 | } |
55 | ||
c2b13452 | 56 | struct ieee80211_bss * |
5484e237 JB |
57 | ieee80211_bss_info_update(struct ieee80211_local *local, |
58 | struct ieee80211_rx_status *rx_status, | |
59 | struct ieee80211_mgmt *mgmt, | |
60 | size_t len, | |
61 | struct ieee802_11_elems *elems, | |
2a519311 JB |
62 | struct ieee80211_channel *channel, |
63 | bool beacon) | |
5484e237 | 64 | { |
c2b13452 | 65 | struct ieee80211_bss *bss; |
00d3f14c | 66 | int clen; |
2a519311 JB |
67 | s32 signal = 0; |
68 | ||
77965c97 | 69 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 70 | signal = rx_status->signal * 100; |
77965c97 | 71 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 72 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 73 | |
00d3f14c | 74 | bss = (void *)cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
77965c97 | 75 | mgmt, len, signal, GFP_ATOMIC); |
5484e237 | 76 | |
00d3f14c JB |
77 | if (!bss) |
78 | return NULL; | |
79 | ||
80 | bss->cbss.free_priv = ieee80211_rx_bss_free; | |
5484e237 JB |
81 | |
82 | /* save the ERP value so that it is available at association time */ | |
83 | if (elems->erp_info && elems->erp_info_len >= 1) { | |
84 | bss->erp_value = elems->erp_info[0]; | |
85 | bss->has_erp_value = 1; | |
86 | } | |
87 | ||
5484e237 JB |
88 | if (elems->tim) { |
89 | struct ieee80211_tim_ie *tim_ie = | |
90 | (struct ieee80211_tim_ie *)elems->tim; | |
91 | bss->dtim_period = tim_ie->dtim_period; | |
92 | } | |
93 | ||
94 | /* set default value for buggy APs */ | |
95 | if (!elems->tim || bss->dtim_period == 0) | |
96 | bss->dtim_period = 1; | |
97 | ||
98 | bss->supp_rates_len = 0; | |
99 | if (elems->supp_rates) { | |
100 | clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; | |
101 | if (clen > elems->supp_rates_len) | |
102 | clen = elems->supp_rates_len; | |
103 | memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates, | |
104 | clen); | |
105 | bss->supp_rates_len += clen; | |
106 | } | |
107 | if (elems->ext_supp_rates) { | |
108 | clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; | |
109 | if (clen > elems->ext_supp_rates_len) | |
110 | clen = elems->ext_supp_rates_len; | |
111 | memcpy(&bss->supp_rates[bss->supp_rates_len], | |
112 | elems->ext_supp_rates, clen); | |
113 | bss->supp_rates_len += clen; | |
114 | } | |
115 | ||
5484e237 JB |
116 | bss->wmm_used = elems->wmm_param || elems->wmm_info; |
117 | ||
118 | if (!beacon) | |
119 | bss->last_probe_resp = jiffies; | |
120 | ||
5484e237 JB |
121 | return bss; |
122 | } | |
0a51b27e | 123 | |
98c8fccf | 124 | ieee80211_rx_result |
f1d58c25 | 125 | ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
98c8fccf | 126 | { |
f1d58c25 | 127 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
98c8fccf | 128 | struct ieee80211_mgmt *mgmt; |
c2b13452 | 129 | struct ieee80211_bss *bss; |
98c8fccf JB |
130 | u8 *elements; |
131 | struct ieee80211_channel *channel; | |
132 | size_t baselen; | |
133 | int freq; | |
134 | __le16 fc; | |
135 | bool presp, beacon = false; | |
136 | struct ieee802_11_elems elems; | |
137 | ||
138 | if (skb->len < 2) | |
139 | return RX_DROP_UNUSABLE; | |
140 | ||
141 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
142 | fc = mgmt->frame_control; | |
143 | ||
144 | if (ieee80211_is_ctl(fc)) | |
145 | return RX_CONTINUE; | |
146 | ||
147 | if (skb->len < 24) | |
148 | return RX_DROP_MONITOR; | |
149 | ||
150 | presp = ieee80211_is_probe_resp(fc); | |
151 | if (presp) { | |
152 | /* ignore ProbeResp to foreign address */ | |
153 | if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) | |
154 | return RX_DROP_MONITOR; | |
155 | ||
156 | presp = true; | |
157 | elements = mgmt->u.probe_resp.variable; | |
158 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
159 | } else { | |
160 | beacon = ieee80211_is_beacon(fc); | |
161 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); | |
162 | elements = mgmt->u.beacon.variable; | |
163 | } | |
164 | ||
165 | if (!presp && !beacon) | |
166 | return RX_CONTINUE; | |
167 | ||
168 | if (baselen > skb->len) | |
169 | return RX_DROP_MONITOR; | |
170 | ||
171 | ieee802_11_parse_elems(elements, skb->len - baselen, &elems); | |
172 | ||
173 | if (elems.ds_params && elems.ds_params_len == 1) | |
174 | freq = ieee80211_channel_to_frequency(elems.ds_params[0]); | |
175 | else | |
176 | freq = rx_status->freq; | |
177 | ||
178 | channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); | |
179 | ||
180 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
181 | return RX_DROP_MONITOR; | |
182 | ||
183 | bss = ieee80211_bss_info_update(sdata->local, rx_status, | |
184 | mgmt, skb->len, &elems, | |
2a519311 | 185 | channel, beacon); |
d048e503 JM |
186 | if (bss) |
187 | ieee80211_rx_bss_put(sdata->local, bss); | |
98c8fccf JB |
188 | |
189 | dev_kfree_skb(skb); | |
190 | return RX_QUEUED; | |
191 | } | |
192 | ||
9050bdd8 KV |
193 | /* |
194 | * inform AP that we will go to sleep so that it will buffer the frames | |
195 | * while we scan | |
196 | */ | |
197 | static void ieee80211_scan_ps_enable(struct ieee80211_sub_if_data *sdata) | |
198 | { | |
199 | struct ieee80211_local *local = sdata->local; | |
200 | bool ps = false; | |
201 | ||
202 | /* FIXME: what to do when local->pspolling is true? */ | |
203 | ||
204 | del_timer_sync(&local->dynamic_ps_timer); | |
205 | cancel_work_sync(&local->dynamic_ps_enable_work); | |
206 | ||
207 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { | |
208 | ps = true; | |
209 | local->hw.conf.flags &= ~IEEE80211_CONF_PS; | |
210 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
211 | } | |
212 | ||
213 | if (!ps || !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) | |
214 | /* | |
215 | * If power save was enabled, no need to send a nullfunc | |
216 | * frame because AP knows that we are sleeping. But if the | |
217 | * hardware is creating the nullfunc frame for power save | |
218 | * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not | |
219 | * enabled) and power save was enabled, the firmware just | |
220 | * sent a null frame with power save disabled. So we need | |
221 | * to send a new nullfunc frame to inform the AP that we | |
222 | * are again sleeping. | |
223 | */ | |
224 | ieee80211_send_nullfunc(local, sdata, 1); | |
225 | } | |
226 | ||
227 | /* inform AP that we are awake again, unless power save is enabled */ | |
228 | static void ieee80211_scan_ps_disable(struct ieee80211_sub_if_data *sdata) | |
229 | { | |
230 | struct ieee80211_local *local = sdata->local; | |
231 | ||
965bedad | 232 | if (!local->ps_sdata) |
9050bdd8 KV |
233 | ieee80211_send_nullfunc(local, sdata, 0); |
234 | else { | |
235 | /* | |
236 | * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware | |
237 | * will send a nullfunc frame with the powersave bit set | |
238 | * even though the AP already knows that we are sleeping. | |
239 | * This could be avoided by sending a null frame with power | |
240 | * save bit disabled before enabling the power save, but | |
241 | * this doesn't gain anything. | |
242 | * | |
243 | * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need | |
244 | * to send a nullfunc frame because AP already knows that | |
245 | * we are sleeping, let's just enable power save mode in | |
246 | * hardware. | |
247 | */ | |
248 | local->hw.conf.flags |= IEEE80211_CONF_PS; | |
249 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
250 | } | |
251 | } | |
252 | ||
f3b85252 JB |
253 | static void ieee80211_restore_scan_ies(struct ieee80211_local *local) |
254 | { | |
255 | kfree(local->scan_req->ie); | |
256 | local->scan_req->ie = local->orig_ies; | |
257 | local->scan_req->ie_len = local->orig_ies_len; | |
258 | } | |
259 | ||
2a519311 | 260 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
261 | { |
262 | struct ieee80211_local *local = hw_to_local(hw); | |
263 | struct ieee80211_sub_if_data *sdata; | |
f3b85252 | 264 | bool was_hw_scan; |
0a51b27e | 265 | |
f3b85252 | 266 | mutex_lock(&local->scan_mtx); |
5bc75728 | 267 | |
f3b85252 JB |
268 | if (WARN_ON(!local->hw_scanning && !local->sw_scanning)) { |
269 | mutex_unlock(&local->scan_mtx); | |
2a519311 | 270 | return; |
f3b85252 | 271 | } |
5bc75728 | 272 | |
f3b85252 JB |
273 | if (WARN_ON(!local->scan_req)) { |
274 | mutex_unlock(&local->scan_mtx); | |
275 | return; | |
de95a54b JB |
276 | } |
277 | ||
f3b85252 JB |
278 | if (local->hw_scanning) |
279 | ieee80211_restore_scan_ies(local); | |
280 | ||
2a519311 JB |
281 | if (local->scan_req != &local->int_scan_req) |
282 | cfg80211_scan_done(local->scan_req, aborted); | |
283 | local->scan_req = NULL; | |
284 | ||
f3b85252 JB |
285 | was_hw_scan = local->hw_scanning; |
286 | local->hw_scanning = false; | |
287 | local->sw_scanning = false; | |
58905ca5 | 288 | local->scan_channel = NULL; |
f3b85252 JB |
289 | |
290 | /* we only have to protect scan_req and hw/sw scan */ | |
291 | mutex_unlock(&local->scan_mtx); | |
292 | ||
e8975581 | 293 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
5cff20e6 JB |
294 | if (was_hw_scan) |
295 | goto done; | |
0a51b27e | 296 | |
3b8d81e0 | 297 | spin_lock_bh(&local->filter_lock); |
0a51b27e | 298 | local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC; |
24487981 JB |
299 | drv_configure_filter(local, FIF_BCN_PRBRESP_PROMISC, |
300 | &local->filter_flags, | |
3b8d81e0 JB |
301 | local->mc_count, |
302 | local->mc_list); | |
303 | spin_unlock_bh(&local->filter_lock); | |
0a51b27e | 304 | |
24487981 | 305 | drv_sw_scan_complete(local); |
80e775bf | 306 | |
078e1e60 JB |
307 | mutex_lock(&local->iflist_mtx); |
308 | list_for_each_entry(sdata, &local->interfaces, list) { | |
fb9ddbf0 JB |
309 | if (!netif_running(sdata->dev)) |
310 | continue; | |
311 | ||
0a51b27e | 312 | /* Tell AP we're back */ |
05c914fe | 313 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
77fdaa12 | 314 | if (sdata->u.mgd.associated) { |
9050bdd8 | 315 | ieee80211_scan_ps_disable(sdata); |
0a51b27e JB |
316 | netif_tx_wake_all_queues(sdata->dev); |
317 | } | |
318 | } else | |
319 | netif_tx_wake_all_queues(sdata->dev); | |
078e1e60 | 320 | |
14b80724 JB |
321 | /* re-enable beaconing */ |
322 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
323 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
324 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
2d0ddec5 JB |
325 | ieee80211_bss_info_change_notify( |
326 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
0a51b27e | 327 | } |
078e1e60 | 328 | mutex_unlock(&local->iflist_mtx); |
0a51b27e JB |
329 | |
330 | done: | |
5cff20e6 | 331 | ieee80211_recalc_idle(local); |
0a51b27e | 332 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 333 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 334 | ieee80211_mesh_notify_scan_completed(local); |
0a51b27e JB |
335 | } |
336 | EXPORT_SYMBOL(ieee80211_scan_completed); | |
337 | ||
f3b85252 JB |
338 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
339 | { | |
340 | struct ieee80211_sub_if_data *sdata; | |
341 | ||
342 | /* | |
343 | * Hardware/driver doesn't support hw_scan, so use software | |
344 | * scanning instead. First send a nullfunc frame with power save | |
345 | * bit on so that AP will buffer the frames for us while we are not | |
346 | * listening, then send probe requests to each channel and wait for | |
347 | * the responses. After all channels are scanned, tune back to the | |
348 | * original channel and send a nullfunc frame with power save bit | |
349 | * off to trigger the AP to send us all the buffered frames. | |
350 | * | |
351 | * Note that while local->sw_scanning is true everything else but | |
352 | * nullfunc frames and probe requests will be dropped in | |
353 | * ieee80211_tx_h_check_assoc(). | |
354 | */ | |
24487981 | 355 | drv_sw_scan_start(local); |
f3b85252 JB |
356 | |
357 | mutex_lock(&local->iflist_mtx); | |
358 | list_for_each_entry(sdata, &local->interfaces, list) { | |
359 | if (!netif_running(sdata->dev)) | |
360 | continue; | |
361 | ||
362 | /* disable beaconing */ | |
363 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
364 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
365 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
2d0ddec5 JB |
366 | ieee80211_bss_info_change_notify( |
367 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
f3b85252 JB |
368 | |
369 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
77fdaa12 | 370 | if (sdata->u.mgd.associated) { |
f3b85252 JB |
371 | netif_tx_stop_all_queues(sdata->dev); |
372 | ieee80211_scan_ps_enable(sdata); | |
373 | } | |
374 | } else | |
375 | netif_tx_stop_all_queues(sdata->dev); | |
376 | } | |
377 | mutex_unlock(&local->iflist_mtx); | |
378 | ||
379 | local->scan_state = SCAN_SET_CHANNEL; | |
380 | local->scan_channel_idx = 0; | |
381 | ||
3b8d81e0 | 382 | spin_lock_bh(&local->filter_lock); |
f3b85252 | 383 | local->filter_flags |= FIF_BCN_PRBRESP_PROMISC; |
24487981 JB |
384 | drv_configure_filter(local, FIF_BCN_PRBRESP_PROMISC, |
385 | &local->filter_flags, | |
3b8d81e0 JB |
386 | local->mc_count, |
387 | local->mc_list); | |
388 | spin_unlock_bh(&local->filter_lock); | |
f3b85252 JB |
389 | |
390 | /* TODO: start scan as soon as all nullfunc frames are ACKed */ | |
391 | queue_delayed_work(local->hw.workqueue, &local->scan_work, | |
392 | IEEE80211_CHANNEL_TIME); | |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
397 | ||
398 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, | |
399 | struct cfg80211_scan_request *req) | |
400 | { | |
401 | struct ieee80211_local *local = sdata->local; | |
402 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; | |
403 | int rc; | |
404 | ||
405 | if (local->scan_req) | |
406 | return -EBUSY; | |
407 | ||
408 | if (local->ops->hw_scan) { | |
409 | u8 *ies; | |
410 | int ielen; | |
411 | ||
412 | ies = kmalloc(2 + IEEE80211_MAX_SSID_LEN + | |
413 | local->scan_ies_len + req->ie_len, GFP_KERNEL); | |
414 | if (!ies) | |
415 | return -ENOMEM; | |
416 | ||
417 | ielen = ieee80211_build_preq_ies(local, ies, | |
418 | req->ie, req->ie_len); | |
419 | local->orig_ies = req->ie; | |
420 | local->orig_ies_len = req->ie_len; | |
421 | req->ie = ies; | |
422 | req->ie_len = ielen; | |
423 | } | |
424 | ||
425 | local->scan_req = req; | |
426 | local->scan_sdata = sdata; | |
427 | ||
428 | if (req != &local->int_scan_req && | |
429 | sdata->vif.type == NL80211_IFTYPE_STATION && | |
77fdaa12 JB |
430 | !list_empty(&ifmgd->work_list)) { |
431 | /* actually wait for the work it's doing to finish/time out */ | |
f3b85252 JB |
432 | set_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request); |
433 | return 0; | |
434 | } | |
435 | ||
436 | if (local->ops->hw_scan) | |
437 | local->hw_scanning = true; | |
438 | else | |
439 | local->sw_scanning = true; | |
440 | /* | |
441 | * Kicking off the scan need not be protected, | |
442 | * only the scan variable stuff, since now | |
443 | * local->scan_req is assigned and other callers | |
444 | * will abort their scan attempts. | |
445 | * | |
446 | * This avoids getting a scan_mtx -> iflist_mtx | |
447 | * dependency, so that the scan completed calls | |
448 | * have more locking freedom. | |
449 | */ | |
5cff20e6 JB |
450 | |
451 | ieee80211_recalc_idle(local); | |
f3b85252 JB |
452 | mutex_unlock(&local->scan_mtx); |
453 | ||
454 | if (local->ops->hw_scan) | |
24487981 | 455 | rc = drv_hw_scan(local, local->scan_req); |
f3b85252 JB |
456 | else |
457 | rc = ieee80211_start_sw_scan(local); | |
458 | ||
459 | mutex_lock(&local->scan_mtx); | |
460 | ||
461 | if (rc) { | |
462 | if (local->ops->hw_scan) { | |
463 | local->hw_scanning = false; | |
464 | ieee80211_restore_scan_ies(local); | |
465 | } else | |
466 | local->sw_scanning = false; | |
467 | ||
5cff20e6 JB |
468 | ieee80211_recalc_idle(local); |
469 | ||
f3b85252 JB |
470 | local->scan_req = NULL; |
471 | local->scan_sdata = NULL; | |
472 | } | |
473 | ||
474 | return rc; | |
475 | } | |
476 | ||
7d3be3cc HS |
477 | static int ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
478 | unsigned long *next_delay) | |
479 | { | |
480 | int skip; | |
481 | struct ieee80211_channel *chan; | |
482 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; | |
483 | ||
484 | /* if no more bands/channels left, complete scan */ | |
485 | if (local->scan_channel_idx >= local->scan_req->n_channels) { | |
486 | ieee80211_scan_completed(&local->hw, false); | |
487 | return 1; | |
488 | } | |
489 | skip = 0; | |
490 | chan = local->scan_req->channels[local->scan_channel_idx]; | |
491 | ||
492 | if (chan->flags & IEEE80211_CHAN_DISABLED || | |
493 | (sdata->vif.type == NL80211_IFTYPE_ADHOC && | |
494 | chan->flags & IEEE80211_CHAN_NO_IBSS)) | |
495 | skip = 1; | |
496 | ||
497 | if (!skip) { | |
498 | local->scan_channel = chan; | |
499 | if (ieee80211_hw_config(local, | |
500 | IEEE80211_CONF_CHANGE_CHANNEL)) | |
501 | skip = 1; | |
502 | } | |
503 | ||
504 | /* advance state machine to next channel/band */ | |
505 | local->scan_channel_idx++; | |
506 | ||
507 | if (skip) | |
508 | return 0; | |
509 | ||
510 | /* | |
511 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
512 | * (which unfortunately doesn't say _why_ step a) is done, | |
513 | * but it waits for the probe delay or until a frame is | |
514 | * received - and the received frame would update the NAV). | |
515 | * For now, we do not support waiting until a frame is | |
516 | * received. | |
517 | * | |
518 | * In any case, it is not necessary for a passive scan. | |
519 | */ | |
520 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || | |
521 | !local->scan_req->n_ssids) { | |
522 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
523 | return 0; | |
524 | } | |
525 | ||
526 | *next_delay = IEEE80211_PROBE_DELAY; | |
527 | local->scan_state = SCAN_SEND_PROBE; | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
532 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, | |
533 | unsigned long *next_delay) | |
534 | { | |
535 | int i; | |
536 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; | |
537 | ||
538 | for (i = 0; i < local->scan_req->n_ssids; i++) | |
539 | ieee80211_send_probe_req( | |
540 | sdata, NULL, | |
541 | local->scan_req->ssids[i].ssid, | |
542 | local->scan_req->ssids[i].ssid_len, | |
543 | local->scan_req->ie, local->scan_req->ie_len); | |
544 | ||
545 | /* | |
546 | * After sending probe requests, wait for probe responses | |
547 | * on the channel. | |
548 | */ | |
549 | *next_delay = IEEE80211_CHANNEL_TIME; | |
550 | local->scan_state = SCAN_SET_CHANNEL; | |
551 | } | |
552 | ||
c2b13452 | 553 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
554 | { |
555 | struct ieee80211_local *local = | |
556 | container_of(work, struct ieee80211_local, scan_work.work); | |
557 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; | |
0a51b27e JB |
558 | unsigned long next_delay = 0; |
559 | ||
f3b85252 JB |
560 | mutex_lock(&local->scan_mtx); |
561 | if (!sdata || !local->scan_req) { | |
562 | mutex_unlock(&local->scan_mtx); | |
563 | return; | |
564 | } | |
565 | ||
566 | if (local->scan_req && !(local->sw_scanning || local->hw_scanning)) { | |
567 | struct cfg80211_scan_request *req = local->scan_req; | |
568 | int rc; | |
569 | ||
570 | local->scan_req = NULL; | |
571 | ||
572 | rc = __ieee80211_start_scan(sdata, req); | |
573 | mutex_unlock(&local->scan_mtx); | |
574 | ||
575 | if (rc) | |
576 | ieee80211_scan_completed(&local->hw, true); | |
577 | return; | |
578 | } | |
579 | ||
580 | mutex_unlock(&local->scan_mtx); | |
581 | ||
5bc75728 JB |
582 | /* |
583 | * Avoid re-scheduling when the sdata is going away. | |
584 | */ | |
f3b85252 JB |
585 | if (!netif_running(sdata->dev)) { |
586 | ieee80211_scan_completed(&local->hw, true); | |
0a51b27e | 587 | return; |
f3b85252 | 588 | } |
0a51b27e JB |
589 | |
590 | switch (local->scan_state) { | |
591 | case SCAN_SET_CHANNEL: | |
7d3be3cc | 592 | if (ieee80211_scan_state_set_channel(local, &next_delay)) |
0a51b27e | 593 | return; |
0a51b27e JB |
594 | break; |
595 | case SCAN_SEND_PROBE: | |
7d3be3cc | 596 | ieee80211_scan_state_send_probe(local, &next_delay); |
0a51b27e JB |
597 | break; |
598 | } | |
599 | ||
5bc75728 JB |
600 | queue_delayed_work(local->hw.workqueue, &local->scan_work, |
601 | next_delay); | |
0a51b27e JB |
602 | } |
603 | ||
f3b85252 JB |
604 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
605 | struct cfg80211_scan_request *req) | |
0a51b27e | 606 | { |
f3b85252 | 607 | int res; |
de95a54b | 608 | |
f3b85252 JB |
609 | mutex_lock(&sdata->local->scan_mtx); |
610 | res = __ieee80211_start_scan(sdata, req); | |
611 | mutex_unlock(&sdata->local->scan_mtx); | |
0a51b27e | 612 | |
f3b85252 | 613 | return res; |
0a51b27e JB |
614 | } |
615 | ||
f3b85252 JB |
616 | int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, |
617 | const u8 *ssid, u8 ssid_len) | |
0a51b27e | 618 | { |
0a51b27e | 619 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 620 | int ret = -EBUSY; |
2a519311 | 621 | |
f3b85252 | 622 | mutex_lock(&local->scan_mtx); |
0a51b27e | 623 | |
f3b85252 JB |
624 | /* busy scanning */ |
625 | if (local->scan_req) | |
626 | goto unlock; | |
9116dd01 | 627 | |
f3b85252 JB |
628 | memcpy(local->int_scan_req.ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
629 | local->int_scan_req.ssids[0].ssid_len = ssid_len; | |
9116dd01 | 630 | |
f3b85252 JB |
631 | ret = __ieee80211_start_scan(sdata, &sdata->local->int_scan_req); |
632 | unlock: | |
633 | mutex_unlock(&local->scan_mtx); | |
634 | return ret; | |
0a51b27e | 635 | } |
5bb644a0 JB |
636 | |
637 | void ieee80211_scan_cancel(struct ieee80211_local *local) | |
638 | { | |
639 | bool swscan; | |
640 | ||
641 | cancel_delayed_work_sync(&local->scan_work); | |
642 | ||
643 | /* | |
644 | * Only call this function when a scan can't be | |
645 | * queued -- mostly at suspend under RTNL. | |
646 | */ | |
647 | mutex_lock(&local->scan_mtx); | |
648 | swscan = local->sw_scanning; | |
649 | mutex_unlock(&local->scan_mtx); | |
650 | ||
651 | if (swscan) | |
652 | ieee80211_scan_completed(&local->hw, true); | |
653 | } |