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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> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
0a51b27e | 18 | #include <net/mac80211.h> |
0a51b27e JB |
19 | |
20 | #include "ieee80211_i.h" | |
24487981 | 21 | #include "driver-ops.h" |
5484e237 | 22 | #include "mesh.h" |
0a51b27e JB |
23 | |
24 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
25 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
96f7e739 | 26 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) |
0a51b27e | 27 | |
c2b13452 | 28 | struct ieee80211_bss * |
5484e237 JB |
29 | ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, |
30 | u8 *ssid, u8 ssid_len) | |
31 | { | |
0c1ad2ca JB |
32 | struct cfg80211_bss *cbss; |
33 | ||
34 | cbss = cfg80211_get_bss(local->hw.wiphy, | |
35 | ieee80211_get_channel(local->hw.wiphy, freq), | |
36 | bssid, ssid, ssid_len, 0, 0); | |
37 | if (!cbss) | |
38 | return NULL; | |
39 | return (void *)cbss->priv; | |
5484e237 JB |
40 | } |
41 | ||
00d3f14c | 42 | static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) |
5484e237 | 43 | { |
0c1ad2ca | 44 | struct ieee80211_bss *bss = (void *)cbss->priv; |
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 | { |
0c1ad2ca JB |
53 | if (!bss) |
54 | return; | |
55 | cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv)); | |
5484e237 JB |
56 | } |
57 | ||
ab13315a KV |
58 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
59 | { | |
60 | u8 qos_info; | |
61 | ||
62 | if (elems->wmm_info && elems->wmm_info_len == 7 | |
63 | && elems->wmm_info[5] == 1) | |
64 | qos_info = elems->wmm_info[6]; | |
65 | else if (elems->wmm_param && elems->wmm_param_len == 24 | |
66 | && elems->wmm_param[5] == 1) | |
67 | qos_info = elems->wmm_param[6]; | |
68 | else | |
69 | /* no valid wmm information or parameter element found */ | |
70 | return false; | |
71 | ||
72 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; | |
73 | } | |
74 | ||
c2b13452 | 75 | struct ieee80211_bss * |
5484e237 JB |
76 | ieee80211_bss_info_update(struct ieee80211_local *local, |
77 | struct ieee80211_rx_status *rx_status, | |
78 | struct ieee80211_mgmt *mgmt, | |
79 | size_t len, | |
80 | struct ieee802_11_elems *elems, | |
2a519311 JB |
81 | struct ieee80211_channel *channel, |
82 | bool beacon) | |
5484e237 | 83 | { |
0c1ad2ca | 84 | struct cfg80211_bss *cbss; |
c2b13452 | 85 | struct ieee80211_bss *bss; |
00d3f14c | 86 | int clen; |
2a519311 JB |
87 | s32 signal = 0; |
88 | ||
77965c97 | 89 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 90 | signal = rx_status->signal * 100; |
77965c97 | 91 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 92 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 93 | |
0c1ad2ca JB |
94 | cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
95 | mgmt, len, signal, GFP_ATOMIC); | |
5484e237 | 96 | |
0c1ad2ca | 97 | if (!cbss) |
00d3f14c JB |
98 | return NULL; |
99 | ||
0c1ad2ca JB |
100 | cbss->free_priv = ieee80211_rx_bss_free; |
101 | bss = (void *)cbss->priv; | |
5484e237 JB |
102 | |
103 | /* save the ERP value so that it is available at association time */ | |
104 | if (elems->erp_info && elems->erp_info_len >= 1) { | |
105 | bss->erp_value = elems->erp_info[0]; | |
106 | bss->has_erp_value = 1; | |
107 | } | |
108 | ||
5484e237 JB |
109 | if (elems->tim) { |
110 | struct ieee80211_tim_ie *tim_ie = | |
111 | (struct ieee80211_tim_ie *)elems->tim; | |
112 | bss->dtim_period = tim_ie->dtim_period; | |
113 | } | |
114 | ||
5484e237 JB |
115 | bss->supp_rates_len = 0; |
116 | if (elems->supp_rates) { | |
117 | clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; | |
118 | if (clen > elems->supp_rates_len) | |
119 | clen = elems->supp_rates_len; | |
120 | memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates, | |
121 | clen); | |
122 | bss->supp_rates_len += clen; | |
123 | } | |
124 | if (elems->ext_supp_rates) { | |
125 | clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; | |
126 | if (clen > elems->ext_supp_rates_len) | |
127 | clen = elems->ext_supp_rates_len; | |
128 | memcpy(&bss->supp_rates[bss->supp_rates_len], | |
129 | elems->ext_supp_rates, clen); | |
130 | bss->supp_rates_len += clen; | |
131 | } | |
132 | ||
5484e237 | 133 | bss->wmm_used = elems->wmm_param || elems->wmm_info; |
ab13315a | 134 | bss->uapsd_supported = is_uapsd_supported(elems); |
5484e237 JB |
135 | |
136 | if (!beacon) | |
137 | bss->last_probe_resp = jiffies; | |
138 | ||
5484e237 JB |
139 | return bss; |
140 | } | |
0a51b27e | 141 | |
98c8fccf | 142 | ieee80211_rx_result |
f1d58c25 | 143 | ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
98c8fccf | 144 | { |
f1d58c25 | 145 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
98c8fccf | 146 | struct ieee80211_mgmt *mgmt; |
c2b13452 | 147 | struct ieee80211_bss *bss; |
98c8fccf JB |
148 | u8 *elements; |
149 | struct ieee80211_channel *channel; | |
150 | size_t baselen; | |
151 | int freq; | |
152 | __le16 fc; | |
153 | bool presp, beacon = false; | |
154 | struct ieee802_11_elems elems; | |
155 | ||
156 | if (skb->len < 2) | |
157 | return RX_DROP_UNUSABLE; | |
158 | ||
159 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
160 | fc = mgmt->frame_control; | |
161 | ||
162 | if (ieee80211_is_ctl(fc)) | |
163 | return RX_CONTINUE; | |
164 | ||
165 | if (skb->len < 24) | |
166 | return RX_DROP_MONITOR; | |
167 | ||
168 | presp = ieee80211_is_probe_resp(fc); | |
169 | if (presp) { | |
170 | /* ignore ProbeResp to foreign address */ | |
47846c9b | 171 | if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
98c8fccf JB |
172 | return RX_DROP_MONITOR; |
173 | ||
174 | presp = true; | |
175 | elements = mgmt->u.probe_resp.variable; | |
176 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
177 | } else { | |
178 | beacon = ieee80211_is_beacon(fc); | |
179 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); | |
180 | elements = mgmt->u.beacon.variable; | |
181 | } | |
182 | ||
183 | if (!presp && !beacon) | |
184 | return RX_CONTINUE; | |
185 | ||
186 | if (baselen > skb->len) | |
187 | return RX_DROP_MONITOR; | |
188 | ||
189 | ieee802_11_parse_elems(elements, skb->len - baselen, &elems); | |
190 | ||
191 | if (elems.ds_params && elems.ds_params_len == 1) | |
192 | freq = ieee80211_channel_to_frequency(elems.ds_params[0]); | |
193 | else | |
194 | freq = rx_status->freq; | |
195 | ||
196 | channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); | |
197 | ||
198 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
199 | return RX_DROP_MONITOR; | |
200 | ||
201 | bss = ieee80211_bss_info_update(sdata->local, rx_status, | |
202 | mgmt, skb->len, &elems, | |
2a519311 | 203 | channel, beacon); |
d048e503 JM |
204 | if (bss) |
205 | ieee80211_rx_bss_put(sdata->local, bss); | |
98c8fccf JB |
206 | |
207 | dev_kfree_skb(skb); | |
208 | return RX_QUEUED; | |
209 | } | |
210 | ||
4d36ec58 JB |
211 | /* return false if no more work */ |
212 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
213 | { | |
214 | struct cfg80211_scan_request *req = local->scan_req; | |
215 | enum ieee80211_band band; | |
216 | int i, ielen, n_chans; | |
217 | ||
218 | do { | |
219 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
220 | return false; | |
221 | ||
222 | band = local->hw_scan_band; | |
223 | n_chans = 0; | |
224 | for (i = 0; i < req->n_channels; i++) { | |
225 | if (req->channels[i]->band == band) { | |
226 | local->hw_scan_req->channels[n_chans] = | |
227 | req->channels[i]; | |
228 | n_chans++; | |
229 | } | |
230 | } | |
231 | ||
232 | local->hw_scan_band++; | |
233 | } while (!n_chans); | |
234 | ||
235 | local->hw_scan_req->n_channels = n_chans; | |
236 | ||
237 | ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, | |
238 | req->ie, req->ie_len, band); | |
239 | local->hw_scan_req->ie_len = ielen; | |
240 | ||
241 | return true; | |
242 | } | |
243 | ||
2a519311 | 244 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
245 | { |
246 | struct ieee80211_local *local = hw_to_local(hw); | |
f3b85252 | 247 | bool was_hw_scan; |
0a51b27e | 248 | |
f3b85252 | 249 | mutex_lock(&local->scan_mtx); |
5bc75728 | 250 | |
6d3560d4 JB |
251 | /* |
252 | * It's ok to abort a not-yet-running scan (that | |
253 | * we have one at all will be verified by checking | |
254 | * local->scan_req next), but not to complete it | |
255 | * successfully. | |
256 | */ | |
257 | if (WARN_ON(!local->scanning && !aborted)) | |
258 | aborted = true; | |
5bc75728 | 259 | |
f3b85252 JB |
260 | if (WARN_ON(!local->scan_req)) { |
261 | mutex_unlock(&local->scan_mtx); | |
262 | return; | |
de95a54b JB |
263 | } |
264 | ||
4d36ec58 JB |
265 | was_hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
266 | if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { | |
267 | ieee80211_queue_delayed_work(&local->hw, | |
268 | &local->scan_work, 0); | |
269 | mutex_unlock(&local->scan_mtx); | |
270 | return; | |
271 | } | |
272 | ||
273 | kfree(local->hw_scan_req); | |
274 | local->hw_scan_req = NULL; | |
f3b85252 | 275 | |
5ba63533 | 276 | if (local->scan_req != local->int_scan_req) |
2a519311 JB |
277 | cfg80211_scan_done(local->scan_req, aborted); |
278 | local->scan_req = NULL; | |
15db0b7f | 279 | local->scan_sdata = NULL; |
2a519311 | 280 | |
fbe9c429 | 281 | local->scanning = 0; |
58905ca5 | 282 | local->scan_channel = NULL; |
f3b85252 JB |
283 | |
284 | /* we only have to protect scan_req and hw/sw scan */ | |
285 | mutex_unlock(&local->scan_mtx); | |
286 | ||
e8975581 | 287 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
5cff20e6 JB |
288 | if (was_hw_scan) |
289 | goto done; | |
0a51b27e | 290 | |
3ac64bee | 291 | ieee80211_configure_filter(local); |
0a51b27e | 292 | |
24487981 | 293 | drv_sw_scan_complete(local); |
80e775bf | 294 | |
b203ffc3 | 295 | ieee80211_offchannel_return(local, true); |
0a51b27e JB |
296 | |
297 | done: | |
5cff20e6 | 298 | ieee80211_recalc_idle(local); |
0a51b27e | 299 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 300 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 301 | ieee80211_mesh_notify_scan_completed(local); |
81ac3462 | 302 | ieee80211_queue_work(&local->hw, &local->work_work); |
0a51b27e JB |
303 | } |
304 | EXPORT_SYMBOL(ieee80211_scan_completed); | |
305 | ||
f3b85252 JB |
306 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
307 | { | |
f3b85252 JB |
308 | /* |
309 | * Hardware/driver doesn't support hw_scan, so use software | |
310 | * scanning instead. First send a nullfunc frame with power save | |
311 | * bit on so that AP will buffer the frames for us while we are not | |
312 | * listening, then send probe requests to each channel and wait for | |
313 | * the responses. After all channels are scanned, tune back to the | |
314 | * original channel and send a nullfunc frame with power save bit | |
315 | * off to trigger the AP to send us all the buffered frames. | |
316 | * | |
317 | * Note that while local->sw_scanning is true everything else but | |
318 | * nullfunc frames and probe requests will be dropped in | |
319 | * ieee80211_tx_h_check_assoc(). | |
320 | */ | |
24487981 | 321 | drv_sw_scan_start(local); |
f3b85252 | 322 | |
b203ffc3 | 323 | ieee80211_offchannel_stop_beaconing(local); |
f3b85252 | 324 | |
977923b0 | 325 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
326 | local->scan_channel_idx = 0; |
327 | ||
a80f7c0b JB |
328 | drv_flush(local, false); |
329 | ||
3ac64bee | 330 | ieee80211_configure_filter(local); |
f3b85252 | 331 | |
42935eca LR |
332 | ieee80211_queue_delayed_work(&local->hw, |
333 | &local->scan_work, | |
334 | IEEE80211_CHANNEL_TIME); | |
f3b85252 JB |
335 | |
336 | return 0; | |
337 | } | |
338 | ||
339 | ||
340 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, | |
341 | struct cfg80211_scan_request *req) | |
342 | { | |
343 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
344 | int rc; |
345 | ||
346 | if (local->scan_req) | |
347 | return -EBUSY; | |
348 | ||
6e7e6213 JL |
349 | if (!list_empty(&local->work_list)) { |
350 | /* wait for the work to finish/time out */ | |
c0ce77b8 JB |
351 | local->scan_req = req; |
352 | local->scan_sdata = sdata; | |
353 | return 0; | |
354 | } | |
355 | ||
f3b85252 JB |
356 | if (local->ops->hw_scan) { |
357 | u8 *ies; | |
f3b85252 | 358 | |
4d36ec58 JB |
359 | local->hw_scan_req = kmalloc( |
360 | sizeof(*local->hw_scan_req) + | |
361 | req->n_channels * sizeof(req->channels[0]) + | |
362 | 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + | |
363 | req->ie_len, GFP_KERNEL); | |
364 | if (!local->hw_scan_req) | |
f3b85252 JB |
365 | return -ENOMEM; |
366 | ||
4d36ec58 JB |
367 | local->hw_scan_req->ssids = req->ssids; |
368 | local->hw_scan_req->n_ssids = req->n_ssids; | |
369 | ies = (u8 *)local->hw_scan_req + | |
370 | sizeof(*local->hw_scan_req) + | |
371 | req->n_channels * sizeof(req->channels[0]); | |
372 | local->hw_scan_req->ie = ies; | |
373 | ||
374 | local->hw_scan_band = 0; | |
6e7e6213 JL |
375 | |
376 | /* | |
377 | * After allocating local->hw_scan_req, we must | |
378 | * go through until ieee80211_prep_hw_scan(), so | |
379 | * anything that might be changed here and leave | |
380 | * this function early must not go after this | |
381 | * allocation. | |
382 | */ | |
f3b85252 JB |
383 | } |
384 | ||
385 | local->scan_req = req; | |
386 | local->scan_sdata = sdata; | |
387 | ||
f3b85252 | 388 | if (local->ops->hw_scan) |
fbe9c429 | 389 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
f3b85252 | 390 | else |
fbe9c429 | 391 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
6e7e6213 | 392 | |
f3b85252 JB |
393 | /* |
394 | * Kicking off the scan need not be protected, | |
395 | * only the scan variable stuff, since now | |
396 | * local->scan_req is assigned and other callers | |
397 | * will abort their scan attempts. | |
398 | * | |
6e7e6213 JL |
399 | * This avoids too many locking dependencies |
400 | * so that the scan completed calls have more | |
401 | * locking freedom. | |
f3b85252 | 402 | */ |
5cff20e6 JB |
403 | |
404 | ieee80211_recalc_idle(local); | |
f3b85252 JB |
405 | mutex_unlock(&local->scan_mtx); |
406 | ||
4d36ec58 JB |
407 | if (local->ops->hw_scan) { |
408 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
409 | rc = drv_hw_scan(local, local->hw_scan_req); | |
410 | } else | |
f3b85252 JB |
411 | rc = ieee80211_start_sw_scan(local); |
412 | ||
413 | mutex_lock(&local->scan_mtx); | |
414 | ||
415 | if (rc) { | |
4d36ec58 JB |
416 | kfree(local->hw_scan_req); |
417 | local->hw_scan_req = NULL; | |
fbe9c429 | 418 | local->scanning = 0; |
f3b85252 | 419 | |
5cff20e6 JB |
420 | ieee80211_recalc_idle(local); |
421 | ||
f3b85252 JB |
422 | local->scan_req = NULL; |
423 | local->scan_sdata = NULL; | |
424 | } | |
425 | ||
426 | return rc; | |
427 | } | |
428 | ||
2fb3f028 HS |
429 | static int ieee80211_scan_state_decision(struct ieee80211_local *local, |
430 | unsigned long *next_delay) | |
7d3be3cc | 431 | { |
142b9f50 HS |
432 | bool associated = false; |
433 | struct ieee80211_sub_if_data *sdata; | |
434 | ||
435 | /* if no more bands/channels left, complete scan and advance to the idle state */ | |
7d3be3cc HS |
436 | if (local->scan_channel_idx >= local->scan_req->n_channels) { |
437 | ieee80211_scan_completed(&local->hw, false); | |
438 | return 1; | |
439 | } | |
2fb3f028 | 440 | |
142b9f50 HS |
441 | /* check if at least one STA interface is associated */ |
442 | mutex_lock(&local->iflist_mtx); | |
443 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 444 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
445 | continue; |
446 | ||
447 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
448 | if (sdata->u.mgd.associated) { | |
449 | associated = true; | |
450 | break; | |
451 | } | |
452 | } | |
453 | } | |
454 | mutex_unlock(&local->iflist_mtx); | |
455 | ||
456 | if (local->scan_channel) { | |
457 | /* | |
458 | * we're currently scanning a different channel, let's | |
459 | * switch back to the operating channel now if at least | |
460 | * one interface is associated. Otherwise just scan the | |
461 | * next channel | |
462 | */ | |
463 | if (associated) | |
977923b0 | 464 | local->next_scan_state = SCAN_ENTER_OPER_CHANNEL; |
142b9f50 | 465 | else |
977923b0 | 466 | local->next_scan_state = SCAN_SET_CHANNEL; |
142b9f50 HS |
467 | } else { |
468 | /* | |
469 | * we're on the operating channel currently, let's | |
470 | * leave that channel now to scan another one | |
471 | */ | |
977923b0 | 472 | local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL; |
142b9f50 HS |
473 | } |
474 | ||
2fb3f028 | 475 | *next_delay = 0; |
2fb3f028 HS |
476 | return 0; |
477 | } | |
478 | ||
142b9f50 HS |
479 | static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local, |
480 | unsigned long *next_delay) | |
481 | { | |
b203ffc3 | 482 | ieee80211_offchannel_stop_station(local); |
142b9f50 HS |
483 | |
484 | __set_bit(SCAN_OFF_CHANNEL, &local->scanning); | |
485 | ||
a80f7c0b JB |
486 | /* |
487 | * What if the nullfunc frames didn't arrive? | |
488 | */ | |
489 | drv_flush(local, false); | |
490 | if (local->ops->flush) | |
491 | *next_delay = 0; | |
492 | else | |
493 | *next_delay = HZ / 10; | |
494 | ||
142b9f50 | 495 | /* advance to the next channel to be scanned */ |
977923b0 | 496 | local->next_scan_state = SCAN_SET_CHANNEL; |
142b9f50 HS |
497 | } |
498 | ||
499 | static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local, | |
500 | unsigned long *next_delay) | |
501 | { | |
142b9f50 HS |
502 | /* switch back to the operating channel */ |
503 | local->scan_channel = NULL; | |
504 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
505 | ||
506 | /* | |
b203ffc3 JM |
507 | * Only re-enable station mode interface now; beaconing will be |
508 | * re-enabled once the full scan has been completed. | |
142b9f50 | 509 | */ |
b203ffc3 | 510 | ieee80211_offchannel_return(local, false); |
142b9f50 HS |
511 | |
512 | __clear_bit(SCAN_OFF_CHANNEL, &local->scanning); | |
513 | ||
514 | *next_delay = HZ / 5; | |
977923b0 | 515 | local->next_scan_state = SCAN_DECISION; |
142b9f50 HS |
516 | } |
517 | ||
2fb3f028 HS |
518 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
519 | unsigned long *next_delay) | |
520 | { | |
521 | int skip; | |
522 | struct ieee80211_channel *chan; | |
2fb3f028 | 523 | |
7d3be3cc HS |
524 | skip = 0; |
525 | chan = local->scan_req->channels[local->scan_channel_idx]; | |
526 | ||
584991dc JB |
527 | local->scan_channel = chan; |
528 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) | |
7d3be3cc HS |
529 | skip = 1; |
530 | ||
7d3be3cc HS |
531 | /* advance state machine to next channel/band */ |
532 | local->scan_channel_idx++; | |
533 | ||
0ee9c13c HS |
534 | if (skip) { |
535 | /* if we skip this channel return to the decision state */ | |
536 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 537 | return; |
0ee9c13c | 538 | } |
7d3be3cc HS |
539 | |
540 | /* | |
541 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
542 | * (which unfortunately doesn't say _why_ step a) is done, | |
543 | * but it waits for the probe delay or until a frame is | |
544 | * received - and the received frame would update the NAV). | |
545 | * For now, we do not support waiting until a frame is | |
546 | * received. | |
547 | * | |
548 | * In any case, it is not necessary for a passive scan. | |
549 | */ | |
550 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || | |
551 | !local->scan_req->n_ssids) { | |
552 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
977923b0 | 553 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 554 | return; |
7d3be3cc HS |
555 | } |
556 | ||
2fb3f028 | 557 | /* active scan, send probes */ |
7d3be3cc | 558 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 559 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
560 | } |
561 | ||
562 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, | |
563 | unsigned long *next_delay) | |
564 | { | |
565 | int i; | |
566 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; | |
567 | ||
568 | for (i = 0; i < local->scan_req->n_ssids; i++) | |
569 | ieee80211_send_probe_req( | |
570 | sdata, NULL, | |
571 | local->scan_req->ssids[i].ssid, | |
572 | local->scan_req->ssids[i].ssid_len, | |
573 | local->scan_req->ie, local->scan_req->ie_len); | |
574 | ||
575 | /* | |
576 | * After sending probe requests, wait for probe responses | |
577 | * on the channel. | |
578 | */ | |
579 | *next_delay = IEEE80211_CHANNEL_TIME; | |
977923b0 | 580 | local->next_scan_state = SCAN_DECISION; |
7d3be3cc HS |
581 | } |
582 | ||
c2b13452 | 583 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
584 | { |
585 | struct ieee80211_local *local = | |
586 | container_of(work, struct ieee80211_local, scan_work.work); | |
587 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; | |
0a51b27e JB |
588 | unsigned long next_delay = 0; |
589 | ||
f3b85252 JB |
590 | mutex_lock(&local->scan_mtx); |
591 | if (!sdata || !local->scan_req) { | |
592 | mutex_unlock(&local->scan_mtx); | |
593 | return; | |
594 | } | |
595 | ||
4d36ec58 JB |
596 | if (local->hw_scan_req) { |
597 | int rc = drv_hw_scan(local, local->hw_scan_req); | |
598 | mutex_unlock(&local->scan_mtx); | |
599 | if (rc) | |
600 | ieee80211_scan_completed(&local->hw, true); | |
601 | return; | |
602 | } | |
603 | ||
fbe9c429 | 604 | if (local->scan_req && !local->scanning) { |
f3b85252 JB |
605 | struct cfg80211_scan_request *req = local->scan_req; |
606 | int rc; | |
607 | ||
608 | local->scan_req = NULL; | |
15db0b7f | 609 | local->scan_sdata = NULL; |
f3b85252 JB |
610 | |
611 | rc = __ieee80211_start_scan(sdata, req); | |
612 | mutex_unlock(&local->scan_mtx); | |
613 | ||
614 | if (rc) | |
615 | ieee80211_scan_completed(&local->hw, true); | |
616 | return; | |
617 | } | |
618 | ||
619 | mutex_unlock(&local->scan_mtx); | |
620 | ||
5bc75728 JB |
621 | /* |
622 | * Avoid re-scheduling when the sdata is going away. | |
623 | */ | |
9607e6b6 | 624 | if (!ieee80211_sdata_running(sdata)) { |
f3b85252 | 625 | ieee80211_scan_completed(&local->hw, true); |
0a51b27e | 626 | return; |
f3b85252 | 627 | } |
0a51b27e | 628 | |
f502d09b HS |
629 | /* |
630 | * as long as no delay is required advance immediately | |
631 | * without scheduling a new work | |
632 | */ | |
633 | do { | |
977923b0 | 634 | switch (local->next_scan_state) { |
2fb3f028 HS |
635 | case SCAN_DECISION: |
636 | if (ieee80211_scan_state_decision(local, &next_delay)) | |
f502d09b HS |
637 | return; |
638 | break; | |
2fb3f028 HS |
639 | case SCAN_SET_CHANNEL: |
640 | ieee80211_scan_state_set_channel(local, &next_delay); | |
641 | break; | |
f502d09b HS |
642 | case SCAN_SEND_PROBE: |
643 | ieee80211_scan_state_send_probe(local, &next_delay); | |
644 | break; | |
142b9f50 HS |
645 | case SCAN_LEAVE_OPER_CHANNEL: |
646 | ieee80211_scan_state_leave_oper_channel(local, &next_delay); | |
647 | break; | |
648 | case SCAN_ENTER_OPER_CHANNEL: | |
649 | ieee80211_scan_state_enter_oper_channel(local, &next_delay); | |
650 | break; | |
f502d09b HS |
651 | } |
652 | } while (next_delay == 0); | |
0a51b27e | 653 | |
42935eca | 654 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
0a51b27e JB |
655 | } |
656 | ||
f3b85252 JB |
657 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
658 | struct cfg80211_scan_request *req) | |
0a51b27e | 659 | { |
f3b85252 | 660 | int res; |
de95a54b | 661 | |
f3b85252 JB |
662 | mutex_lock(&sdata->local->scan_mtx); |
663 | res = __ieee80211_start_scan(sdata, req); | |
664 | mutex_unlock(&sdata->local->scan_mtx); | |
0a51b27e | 665 | |
f3b85252 | 666 | return res; |
0a51b27e JB |
667 | } |
668 | ||
f3b85252 JB |
669 | int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, |
670 | const u8 *ssid, u8 ssid_len) | |
0a51b27e | 671 | { |
0a51b27e | 672 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 673 | int ret = -EBUSY; |
2a519311 | 674 | |
f3b85252 | 675 | mutex_lock(&local->scan_mtx); |
0a51b27e | 676 | |
f3b85252 JB |
677 | /* busy scanning */ |
678 | if (local->scan_req) | |
679 | goto unlock; | |
9116dd01 | 680 | |
5ba63533 JB |
681 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
682 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 683 | |
5ba63533 | 684 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 JB |
685 | unlock: |
686 | mutex_unlock(&local->scan_mtx); | |
687 | return ret; | |
0a51b27e | 688 | } |
5bb644a0 JB |
689 | |
690 | void ieee80211_scan_cancel(struct ieee80211_local *local) | |
691 | { | |
15db0b7f | 692 | bool abortscan; |
5bb644a0 JB |
693 | |
694 | cancel_delayed_work_sync(&local->scan_work); | |
695 | ||
696 | /* | |
697 | * Only call this function when a scan can't be | |
698 | * queued -- mostly at suspend under RTNL. | |
699 | */ | |
700 | mutex_lock(&local->scan_mtx); | |
15db0b7f JB |
701 | abortscan = test_bit(SCAN_SW_SCANNING, &local->scanning) || |
702 | (!local->scanning && local->scan_req); | |
5bb644a0 JB |
703 | mutex_unlock(&local->scan_mtx); |
704 | ||
15db0b7f | 705 | if (abortscan) |
5bb644a0 JB |
706 | ieee80211_scan_completed(&local->hw, true); |
707 | } |