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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 | ||
0a51b27e | 15 | #include <linux/if_arp.h> |
078e1e60 | 16 | #include <linux/rtnetlink.h> |
0a51b27e | 17 | #include <net/mac80211.h> |
0a51b27e JB |
18 | |
19 | #include "ieee80211_i.h" | |
24487981 | 20 | #include "driver-ops.h" |
5484e237 | 21 | #include "mesh.h" |
0a51b27e JB |
22 | |
23 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
24 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
96f7e739 | 25 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) |
0a51b27e | 26 | |
c2b13452 | 27 | struct ieee80211_bss * |
5484e237 JB |
28 | ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, |
29 | u8 *ssid, u8 ssid_len) | |
30 | { | |
0c1ad2ca JB |
31 | struct cfg80211_bss *cbss; |
32 | ||
33 | cbss = cfg80211_get_bss(local->hw.wiphy, | |
34 | ieee80211_get_channel(local->hw.wiphy, freq), | |
35 | bssid, ssid, ssid_len, 0, 0); | |
36 | if (!cbss) | |
37 | return NULL; | |
38 | return (void *)cbss->priv; | |
5484e237 JB |
39 | } |
40 | ||
00d3f14c | 41 | static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) |
5484e237 | 42 | { |
0c1ad2ca | 43 | struct ieee80211_bss *bss = (void *)cbss->priv; |
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 | { |
0c1ad2ca JB |
52 | if (!bss) |
53 | return; | |
54 | cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv)); | |
5484e237 JB |
55 | } |
56 | ||
ab13315a KV |
57 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
58 | { | |
59 | u8 qos_info; | |
60 | ||
61 | if (elems->wmm_info && elems->wmm_info_len == 7 | |
62 | && elems->wmm_info[5] == 1) | |
63 | qos_info = elems->wmm_info[6]; | |
64 | else if (elems->wmm_param && elems->wmm_param_len == 24 | |
65 | && elems->wmm_param[5] == 1) | |
66 | qos_info = elems->wmm_param[6]; | |
67 | else | |
68 | /* no valid wmm information or parameter element found */ | |
69 | return false; | |
70 | ||
71 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; | |
72 | } | |
73 | ||
c2b13452 | 74 | struct ieee80211_bss * |
5484e237 JB |
75 | ieee80211_bss_info_update(struct ieee80211_local *local, |
76 | struct ieee80211_rx_status *rx_status, | |
77 | struct ieee80211_mgmt *mgmt, | |
78 | size_t len, | |
79 | struct ieee802_11_elems *elems, | |
2a519311 JB |
80 | struct ieee80211_channel *channel, |
81 | bool beacon) | |
5484e237 | 82 | { |
0c1ad2ca | 83 | struct cfg80211_bss *cbss; |
c2b13452 | 84 | struct ieee80211_bss *bss; |
00d3f14c | 85 | int clen; |
2a519311 JB |
86 | s32 signal = 0; |
87 | ||
77965c97 | 88 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 89 | signal = rx_status->signal * 100; |
77965c97 | 90 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 91 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 92 | |
0c1ad2ca JB |
93 | cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
94 | mgmt, len, signal, GFP_ATOMIC); | |
5484e237 | 95 | |
0c1ad2ca | 96 | if (!cbss) |
00d3f14c JB |
97 | return NULL; |
98 | ||
0c1ad2ca JB |
99 | cbss->free_priv = ieee80211_rx_bss_free; |
100 | bss = (void *)cbss->priv; | |
5484e237 JB |
101 | |
102 | /* save the ERP value so that it is available at association time */ | |
103 | if (elems->erp_info && elems->erp_info_len >= 1) { | |
104 | bss->erp_value = elems->erp_info[0]; | |
105 | bss->has_erp_value = 1; | |
106 | } | |
107 | ||
5484e237 JB |
108 | if (elems->tim) { |
109 | struct ieee80211_tim_ie *tim_ie = | |
110 | (struct ieee80211_tim_ie *)elems->tim; | |
111 | bss->dtim_period = tim_ie->dtim_period; | |
112 | } | |
113 | ||
5484e237 JB |
114 | bss->supp_rates_len = 0; |
115 | if (elems->supp_rates) { | |
116 | clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; | |
117 | if (clen > elems->supp_rates_len) | |
118 | clen = elems->supp_rates_len; | |
119 | memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates, | |
120 | clen); | |
121 | bss->supp_rates_len += clen; | |
122 | } | |
123 | if (elems->ext_supp_rates) { | |
124 | clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; | |
125 | if (clen > elems->ext_supp_rates_len) | |
126 | clen = elems->ext_supp_rates_len; | |
127 | memcpy(&bss->supp_rates[bss->supp_rates_len], | |
128 | elems->ext_supp_rates, clen); | |
129 | bss->supp_rates_len += clen; | |
130 | } | |
131 | ||
5484e237 | 132 | bss->wmm_used = elems->wmm_param || elems->wmm_info; |
ab13315a | 133 | bss->uapsd_supported = is_uapsd_supported(elems); |
5484e237 JB |
134 | |
135 | if (!beacon) | |
136 | bss->last_probe_resp = jiffies; | |
137 | ||
5484e237 JB |
138 | return bss; |
139 | } | |
0a51b27e | 140 | |
98c8fccf | 141 | ieee80211_rx_result |
f1d58c25 | 142 | ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
98c8fccf | 143 | { |
f1d58c25 | 144 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
98c8fccf | 145 | struct ieee80211_mgmt *mgmt; |
c2b13452 | 146 | struct ieee80211_bss *bss; |
98c8fccf JB |
147 | u8 *elements; |
148 | struct ieee80211_channel *channel; | |
149 | size_t baselen; | |
150 | int freq; | |
151 | __le16 fc; | |
152 | bool presp, beacon = false; | |
153 | struct ieee802_11_elems elems; | |
154 | ||
155 | if (skb->len < 2) | |
156 | return RX_DROP_UNUSABLE; | |
157 | ||
158 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
159 | fc = mgmt->frame_control; | |
160 | ||
161 | if (ieee80211_is_ctl(fc)) | |
162 | return RX_CONTINUE; | |
163 | ||
164 | if (skb->len < 24) | |
165 | return RX_DROP_MONITOR; | |
166 | ||
167 | presp = ieee80211_is_probe_resp(fc); | |
168 | if (presp) { | |
169 | /* ignore ProbeResp to foreign address */ | |
47846c9b | 170 | if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
98c8fccf JB |
171 | return RX_DROP_MONITOR; |
172 | ||
173 | presp = true; | |
174 | elements = mgmt->u.probe_resp.variable; | |
175 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
176 | } else { | |
177 | beacon = ieee80211_is_beacon(fc); | |
178 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); | |
179 | elements = mgmt->u.beacon.variable; | |
180 | } | |
181 | ||
182 | if (!presp && !beacon) | |
183 | return RX_CONTINUE; | |
184 | ||
185 | if (baselen > skb->len) | |
186 | return RX_DROP_MONITOR; | |
187 | ||
188 | ieee802_11_parse_elems(elements, skb->len - baselen, &elems); | |
189 | ||
190 | if (elems.ds_params && elems.ds_params_len == 1) | |
191 | freq = ieee80211_channel_to_frequency(elems.ds_params[0]); | |
192 | else | |
193 | freq = rx_status->freq; | |
194 | ||
195 | channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); | |
196 | ||
197 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
198 | return RX_DROP_MONITOR; | |
199 | ||
200 | bss = ieee80211_bss_info_update(sdata->local, rx_status, | |
201 | mgmt, skb->len, &elems, | |
2a519311 | 202 | channel, beacon); |
d048e503 JM |
203 | if (bss) |
204 | ieee80211_rx_bss_put(sdata->local, bss); | |
98c8fccf JB |
205 | |
206 | dev_kfree_skb(skb); | |
207 | return RX_QUEUED; | |
208 | } | |
209 | ||
4d36ec58 JB |
210 | /* return false if no more work */ |
211 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
212 | { | |
213 | struct cfg80211_scan_request *req = local->scan_req; | |
214 | enum ieee80211_band band; | |
215 | int i, ielen, n_chans; | |
216 | ||
217 | do { | |
218 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
219 | return false; | |
220 | ||
221 | band = local->hw_scan_band; | |
222 | n_chans = 0; | |
223 | for (i = 0; i < req->n_channels; i++) { | |
224 | if (req->channels[i]->band == band) { | |
225 | local->hw_scan_req->channels[n_chans] = | |
226 | req->channels[i]; | |
227 | n_chans++; | |
228 | } | |
229 | } | |
230 | ||
231 | local->hw_scan_band++; | |
232 | } while (!n_chans); | |
233 | ||
234 | local->hw_scan_req->n_channels = n_chans; | |
235 | ||
236 | ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, | |
237 | req->ie, req->ie_len, band); | |
238 | local->hw_scan_req->ie_len = ielen; | |
239 | ||
240 | return true; | |
241 | } | |
242 | ||
2a519311 | 243 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
244 | { |
245 | struct ieee80211_local *local = hw_to_local(hw); | |
f3b85252 | 246 | bool was_hw_scan; |
0a51b27e | 247 | |
f3b85252 | 248 | mutex_lock(&local->scan_mtx); |
5bc75728 | 249 | |
6d3560d4 JB |
250 | /* |
251 | * It's ok to abort a not-yet-running scan (that | |
252 | * we have one at all will be verified by checking | |
253 | * local->scan_req next), but not to complete it | |
254 | * successfully. | |
255 | */ | |
256 | if (WARN_ON(!local->scanning && !aborted)) | |
257 | aborted = true; | |
5bc75728 | 258 | |
f3b85252 JB |
259 | if (WARN_ON(!local->scan_req)) { |
260 | mutex_unlock(&local->scan_mtx); | |
261 | return; | |
de95a54b JB |
262 | } |
263 | ||
4d36ec58 JB |
264 | was_hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
265 | if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { | |
266 | ieee80211_queue_delayed_work(&local->hw, | |
267 | &local->scan_work, 0); | |
268 | mutex_unlock(&local->scan_mtx); | |
269 | return; | |
270 | } | |
271 | ||
272 | kfree(local->hw_scan_req); | |
273 | local->hw_scan_req = NULL; | |
f3b85252 | 274 | |
5ba63533 | 275 | if (local->scan_req != local->int_scan_req) |
2a519311 JB |
276 | cfg80211_scan_done(local->scan_req, aborted); |
277 | local->scan_req = NULL; | |
15db0b7f | 278 | local->scan_sdata = NULL; |
2a519311 | 279 | |
fbe9c429 | 280 | local->scanning = 0; |
58905ca5 | 281 | local->scan_channel = NULL; |
f3b85252 JB |
282 | |
283 | /* we only have to protect scan_req and hw/sw scan */ | |
284 | mutex_unlock(&local->scan_mtx); | |
285 | ||
e8975581 | 286 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
5cff20e6 JB |
287 | if (was_hw_scan) |
288 | goto done; | |
0a51b27e | 289 | |
3ac64bee | 290 | ieee80211_configure_filter(local); |
0a51b27e | 291 | |
24487981 | 292 | drv_sw_scan_complete(local); |
80e775bf | 293 | |
b203ffc3 | 294 | ieee80211_offchannel_return(local, true); |
0a51b27e JB |
295 | |
296 | done: | |
5cff20e6 | 297 | ieee80211_recalc_idle(local); |
0a51b27e | 298 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 299 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 300 | ieee80211_mesh_notify_scan_completed(local); |
81ac3462 | 301 | ieee80211_queue_work(&local->hw, &local->work_work); |
0a51b27e JB |
302 | } |
303 | EXPORT_SYMBOL(ieee80211_scan_completed); | |
304 | ||
f3b85252 JB |
305 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
306 | { | |
f3b85252 JB |
307 | /* |
308 | * Hardware/driver doesn't support hw_scan, so use software | |
309 | * scanning instead. First send a nullfunc frame with power save | |
310 | * bit on so that AP will buffer the frames for us while we are not | |
311 | * listening, then send probe requests to each channel and wait for | |
312 | * the responses. After all channels are scanned, tune back to the | |
313 | * original channel and send a nullfunc frame with power save bit | |
314 | * off to trigger the AP to send us all the buffered frames. | |
315 | * | |
316 | * Note that while local->sw_scanning is true everything else but | |
317 | * nullfunc frames and probe requests will be dropped in | |
318 | * ieee80211_tx_h_check_assoc(). | |
319 | */ | |
24487981 | 320 | drv_sw_scan_start(local); |
f3b85252 | 321 | |
b203ffc3 | 322 | ieee80211_offchannel_stop_beaconing(local); |
f3b85252 | 323 | |
977923b0 | 324 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
325 | local->scan_channel_idx = 0; |
326 | ||
a80f7c0b JB |
327 | drv_flush(local, false); |
328 | ||
3ac64bee | 329 | ieee80211_configure_filter(local); |
f3b85252 | 330 | |
42935eca LR |
331 | ieee80211_queue_delayed_work(&local->hw, |
332 | &local->scan_work, | |
333 | IEEE80211_CHANNEL_TIME); | |
f3b85252 JB |
334 | |
335 | return 0; | |
336 | } | |
337 | ||
338 | ||
339 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, | |
340 | struct cfg80211_scan_request *req) | |
341 | { | |
342 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
343 | int rc; |
344 | ||
345 | if (local->scan_req) | |
346 | return -EBUSY; | |
347 | ||
6e7e6213 JL |
348 | if (!list_empty(&local->work_list)) { |
349 | /* wait for the work to finish/time out */ | |
c0ce77b8 JB |
350 | local->scan_req = req; |
351 | local->scan_sdata = sdata; | |
352 | return 0; | |
353 | } | |
354 | ||
f3b85252 JB |
355 | if (local->ops->hw_scan) { |
356 | u8 *ies; | |
f3b85252 | 357 | |
4d36ec58 JB |
358 | local->hw_scan_req = kmalloc( |
359 | sizeof(*local->hw_scan_req) + | |
360 | req->n_channels * sizeof(req->channels[0]) + | |
361 | 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + | |
362 | req->ie_len, GFP_KERNEL); | |
363 | if (!local->hw_scan_req) | |
f3b85252 JB |
364 | return -ENOMEM; |
365 | ||
4d36ec58 JB |
366 | local->hw_scan_req->ssids = req->ssids; |
367 | local->hw_scan_req->n_ssids = req->n_ssids; | |
368 | ies = (u8 *)local->hw_scan_req + | |
369 | sizeof(*local->hw_scan_req) + | |
370 | req->n_channels * sizeof(req->channels[0]); | |
371 | local->hw_scan_req->ie = ies; | |
372 | ||
373 | local->hw_scan_band = 0; | |
6e7e6213 JL |
374 | |
375 | /* | |
376 | * After allocating local->hw_scan_req, we must | |
377 | * go through until ieee80211_prep_hw_scan(), so | |
378 | * anything that might be changed here and leave | |
379 | * this function early must not go after this | |
380 | * allocation. | |
381 | */ | |
f3b85252 JB |
382 | } |
383 | ||
384 | local->scan_req = req; | |
385 | local->scan_sdata = sdata; | |
386 | ||
f3b85252 | 387 | if (local->ops->hw_scan) |
fbe9c429 | 388 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
f3b85252 | 389 | else |
fbe9c429 | 390 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
6e7e6213 | 391 | |
f3b85252 JB |
392 | /* |
393 | * Kicking off the scan need not be protected, | |
394 | * only the scan variable stuff, since now | |
395 | * local->scan_req is assigned and other callers | |
396 | * will abort their scan attempts. | |
397 | * | |
6e7e6213 JL |
398 | * This avoids too many locking dependencies |
399 | * so that the scan completed calls have more | |
400 | * locking freedom. | |
f3b85252 | 401 | */ |
5cff20e6 JB |
402 | |
403 | ieee80211_recalc_idle(local); | |
f3b85252 JB |
404 | mutex_unlock(&local->scan_mtx); |
405 | ||
4d36ec58 JB |
406 | if (local->ops->hw_scan) { |
407 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
408 | rc = drv_hw_scan(local, local->hw_scan_req); | |
409 | } else | |
f3b85252 JB |
410 | rc = ieee80211_start_sw_scan(local); |
411 | ||
412 | mutex_lock(&local->scan_mtx); | |
413 | ||
414 | if (rc) { | |
4d36ec58 JB |
415 | kfree(local->hw_scan_req); |
416 | local->hw_scan_req = NULL; | |
fbe9c429 | 417 | local->scanning = 0; |
f3b85252 | 418 | |
5cff20e6 JB |
419 | ieee80211_recalc_idle(local); |
420 | ||
f3b85252 JB |
421 | local->scan_req = NULL; |
422 | local->scan_sdata = NULL; | |
423 | } | |
424 | ||
425 | return rc; | |
426 | } | |
427 | ||
2fb3f028 HS |
428 | static int ieee80211_scan_state_decision(struct ieee80211_local *local, |
429 | unsigned long *next_delay) | |
7d3be3cc | 430 | { |
142b9f50 HS |
431 | bool associated = false; |
432 | struct ieee80211_sub_if_data *sdata; | |
433 | ||
434 | /* if no more bands/channels left, complete scan and advance to the idle state */ | |
7d3be3cc HS |
435 | if (local->scan_channel_idx >= local->scan_req->n_channels) { |
436 | ieee80211_scan_completed(&local->hw, false); | |
437 | return 1; | |
438 | } | |
2fb3f028 | 439 | |
142b9f50 HS |
440 | /* check if at least one STA interface is associated */ |
441 | mutex_lock(&local->iflist_mtx); | |
442 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 443 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
444 | continue; |
445 | ||
446 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
447 | if (sdata->u.mgd.associated) { | |
448 | associated = true; | |
449 | break; | |
450 | } | |
451 | } | |
452 | } | |
453 | mutex_unlock(&local->iflist_mtx); | |
454 | ||
455 | if (local->scan_channel) { | |
456 | /* | |
457 | * we're currently scanning a different channel, let's | |
458 | * switch back to the operating channel now if at least | |
459 | * one interface is associated. Otherwise just scan the | |
460 | * next channel | |
461 | */ | |
462 | if (associated) | |
977923b0 | 463 | local->next_scan_state = SCAN_ENTER_OPER_CHANNEL; |
142b9f50 | 464 | else |
977923b0 | 465 | local->next_scan_state = SCAN_SET_CHANNEL; |
142b9f50 HS |
466 | } else { |
467 | /* | |
468 | * we're on the operating channel currently, let's | |
469 | * leave that channel now to scan another one | |
470 | */ | |
977923b0 | 471 | local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL; |
142b9f50 HS |
472 | } |
473 | ||
2fb3f028 | 474 | *next_delay = 0; |
2fb3f028 HS |
475 | return 0; |
476 | } | |
477 | ||
142b9f50 HS |
478 | static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local, |
479 | unsigned long *next_delay) | |
480 | { | |
b203ffc3 | 481 | ieee80211_offchannel_stop_station(local); |
142b9f50 HS |
482 | |
483 | __set_bit(SCAN_OFF_CHANNEL, &local->scanning); | |
484 | ||
a80f7c0b JB |
485 | /* |
486 | * What if the nullfunc frames didn't arrive? | |
487 | */ | |
488 | drv_flush(local, false); | |
489 | if (local->ops->flush) | |
490 | *next_delay = 0; | |
491 | else | |
492 | *next_delay = HZ / 10; | |
493 | ||
142b9f50 | 494 | /* advance to the next channel to be scanned */ |
977923b0 | 495 | local->next_scan_state = SCAN_SET_CHANNEL; |
142b9f50 HS |
496 | } |
497 | ||
498 | static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local, | |
499 | unsigned long *next_delay) | |
500 | { | |
142b9f50 HS |
501 | /* switch back to the operating channel */ |
502 | local->scan_channel = NULL; | |
503 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
504 | ||
505 | /* | |
b203ffc3 JM |
506 | * Only re-enable station mode interface now; beaconing will be |
507 | * re-enabled once the full scan has been completed. | |
142b9f50 | 508 | */ |
b203ffc3 | 509 | ieee80211_offchannel_return(local, false); |
142b9f50 HS |
510 | |
511 | __clear_bit(SCAN_OFF_CHANNEL, &local->scanning); | |
512 | ||
513 | *next_delay = HZ / 5; | |
977923b0 | 514 | local->next_scan_state = SCAN_DECISION; |
142b9f50 HS |
515 | } |
516 | ||
2fb3f028 HS |
517 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
518 | unsigned long *next_delay) | |
519 | { | |
520 | int skip; | |
521 | struct ieee80211_channel *chan; | |
2fb3f028 | 522 | |
7d3be3cc HS |
523 | skip = 0; |
524 | chan = local->scan_req->channels[local->scan_channel_idx]; | |
525 | ||
584991dc JB |
526 | local->scan_channel = chan; |
527 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) | |
7d3be3cc HS |
528 | skip = 1; |
529 | ||
7d3be3cc HS |
530 | /* advance state machine to next channel/band */ |
531 | local->scan_channel_idx++; | |
532 | ||
0ee9c13c HS |
533 | if (skip) { |
534 | /* if we skip this channel return to the decision state */ | |
535 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 536 | return; |
0ee9c13c | 537 | } |
7d3be3cc HS |
538 | |
539 | /* | |
540 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
541 | * (which unfortunately doesn't say _why_ step a) is done, | |
542 | * but it waits for the probe delay or until a frame is | |
543 | * received - and the received frame would update the NAV). | |
544 | * For now, we do not support waiting until a frame is | |
545 | * received. | |
546 | * | |
547 | * In any case, it is not necessary for a passive scan. | |
548 | */ | |
549 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || | |
550 | !local->scan_req->n_ssids) { | |
551 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
977923b0 | 552 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 553 | return; |
7d3be3cc HS |
554 | } |
555 | ||
2fb3f028 | 556 | /* active scan, send probes */ |
7d3be3cc | 557 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 558 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
559 | } |
560 | ||
561 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, | |
562 | unsigned long *next_delay) | |
563 | { | |
564 | int i; | |
565 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; | |
566 | ||
567 | for (i = 0; i < local->scan_req->n_ssids; i++) | |
568 | ieee80211_send_probe_req( | |
569 | sdata, NULL, | |
570 | local->scan_req->ssids[i].ssid, | |
571 | local->scan_req->ssids[i].ssid_len, | |
572 | local->scan_req->ie, local->scan_req->ie_len); | |
573 | ||
574 | /* | |
575 | * After sending probe requests, wait for probe responses | |
576 | * on the channel. | |
577 | */ | |
578 | *next_delay = IEEE80211_CHANNEL_TIME; | |
977923b0 | 579 | local->next_scan_state = SCAN_DECISION; |
7d3be3cc HS |
580 | } |
581 | ||
c2b13452 | 582 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
583 | { |
584 | struct ieee80211_local *local = | |
585 | container_of(work, struct ieee80211_local, scan_work.work); | |
586 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; | |
0a51b27e JB |
587 | unsigned long next_delay = 0; |
588 | ||
f3b85252 JB |
589 | mutex_lock(&local->scan_mtx); |
590 | if (!sdata || !local->scan_req) { | |
591 | mutex_unlock(&local->scan_mtx); | |
592 | return; | |
593 | } | |
594 | ||
4d36ec58 JB |
595 | if (local->hw_scan_req) { |
596 | int rc = drv_hw_scan(local, local->hw_scan_req); | |
597 | mutex_unlock(&local->scan_mtx); | |
598 | if (rc) | |
599 | ieee80211_scan_completed(&local->hw, true); | |
600 | return; | |
601 | } | |
602 | ||
fbe9c429 | 603 | if (local->scan_req && !local->scanning) { |
f3b85252 JB |
604 | struct cfg80211_scan_request *req = local->scan_req; |
605 | int rc; | |
606 | ||
607 | local->scan_req = NULL; | |
15db0b7f | 608 | local->scan_sdata = NULL; |
f3b85252 JB |
609 | |
610 | rc = __ieee80211_start_scan(sdata, req); | |
611 | mutex_unlock(&local->scan_mtx); | |
612 | ||
613 | if (rc) | |
614 | ieee80211_scan_completed(&local->hw, true); | |
615 | return; | |
616 | } | |
617 | ||
618 | mutex_unlock(&local->scan_mtx); | |
619 | ||
5bc75728 JB |
620 | /* |
621 | * Avoid re-scheduling when the sdata is going away. | |
622 | */ | |
9607e6b6 | 623 | if (!ieee80211_sdata_running(sdata)) { |
f3b85252 | 624 | ieee80211_scan_completed(&local->hw, true); |
0a51b27e | 625 | return; |
f3b85252 | 626 | } |
0a51b27e | 627 | |
f502d09b HS |
628 | /* |
629 | * as long as no delay is required advance immediately | |
630 | * without scheduling a new work | |
631 | */ | |
632 | do { | |
977923b0 | 633 | switch (local->next_scan_state) { |
2fb3f028 HS |
634 | case SCAN_DECISION: |
635 | if (ieee80211_scan_state_decision(local, &next_delay)) | |
f502d09b HS |
636 | return; |
637 | break; | |
2fb3f028 HS |
638 | case SCAN_SET_CHANNEL: |
639 | ieee80211_scan_state_set_channel(local, &next_delay); | |
640 | break; | |
f502d09b HS |
641 | case SCAN_SEND_PROBE: |
642 | ieee80211_scan_state_send_probe(local, &next_delay); | |
643 | break; | |
142b9f50 HS |
644 | case SCAN_LEAVE_OPER_CHANNEL: |
645 | ieee80211_scan_state_leave_oper_channel(local, &next_delay); | |
646 | break; | |
647 | case SCAN_ENTER_OPER_CHANNEL: | |
648 | ieee80211_scan_state_enter_oper_channel(local, &next_delay); | |
649 | break; | |
f502d09b HS |
650 | } |
651 | } while (next_delay == 0); | |
0a51b27e | 652 | |
42935eca | 653 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
0a51b27e JB |
654 | } |
655 | ||
f3b85252 JB |
656 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
657 | struct cfg80211_scan_request *req) | |
0a51b27e | 658 | { |
f3b85252 | 659 | int res; |
de95a54b | 660 | |
f3b85252 JB |
661 | mutex_lock(&sdata->local->scan_mtx); |
662 | res = __ieee80211_start_scan(sdata, req); | |
663 | mutex_unlock(&sdata->local->scan_mtx); | |
0a51b27e | 664 | |
f3b85252 | 665 | return res; |
0a51b27e JB |
666 | } |
667 | ||
f3b85252 JB |
668 | int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, |
669 | const u8 *ssid, u8 ssid_len) | |
0a51b27e | 670 | { |
0a51b27e | 671 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 672 | int ret = -EBUSY; |
2a519311 | 673 | |
f3b85252 | 674 | mutex_lock(&local->scan_mtx); |
0a51b27e | 675 | |
f3b85252 JB |
676 | /* busy scanning */ |
677 | if (local->scan_req) | |
678 | goto unlock; | |
9116dd01 | 679 | |
5ba63533 JB |
680 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
681 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 682 | |
5ba63533 | 683 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 JB |
684 | unlock: |
685 | mutex_unlock(&local->scan_mtx); | |
686 | return ret; | |
0a51b27e | 687 | } |
5bb644a0 JB |
688 | |
689 | void ieee80211_scan_cancel(struct ieee80211_local *local) | |
690 | { | |
15db0b7f | 691 | bool abortscan; |
5bb644a0 JB |
692 | |
693 | cancel_delayed_work_sync(&local->scan_work); | |
694 | ||
695 | /* | |
696 | * Only call this function when a scan can't be | |
697 | * queued -- mostly at suspend under RTNL. | |
698 | */ | |
699 | mutex_lock(&local->scan_mtx); | |
15db0b7f JB |
700 | abortscan = test_bit(SCAN_SW_SCANNING, &local->scanning) || |
701 | (!local->scanning && local->scan_req); | |
5bb644a0 JB |
702 | mutex_unlock(&local->scan_mtx); |
703 | ||
15db0b7f | 704 | if (abortscan) |
5bb644a0 JB |
705 | ieee80211_scan_completed(&local->hw, true); |
706 | } |