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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" | |
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 | enum cfg80211_signal_type sigtype = CFG80211_SIGNAL_TYPE_NONE; |
67 | s32 signal = 0; | |
68 | ||
69 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
70 | sigtype = CFG80211_SIGNAL_TYPE_MBM; | |
71 | signal = rx_status->signal * 100; | |
72 | } else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) { | |
73 | sigtype = CFG80211_SIGNAL_TYPE_UNSPEC; | |
74 | signal = (rx_status->signal * 100) / local->hw.max_signal; | |
75 | } | |
76 | ||
00d3f14c JB |
77 | bss = (void *)cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
78 | mgmt, len, signal, sigtype, | |
79 | GFP_ATOMIC); | |
5484e237 | 80 | |
00d3f14c JB |
81 | if (!bss) |
82 | return NULL; | |
83 | ||
84 | bss->cbss.free_priv = ieee80211_rx_bss_free; | |
5484e237 JB |
85 | |
86 | /* save the ERP value so that it is available at association time */ | |
87 | if (elems->erp_info && elems->erp_info_len >= 1) { | |
88 | bss->erp_value = elems->erp_info[0]; | |
89 | bss->has_erp_value = 1; | |
90 | } | |
91 | ||
5484e237 JB |
92 | if (elems->tim) { |
93 | struct ieee80211_tim_ie *tim_ie = | |
94 | (struct ieee80211_tim_ie *)elems->tim; | |
95 | bss->dtim_period = tim_ie->dtim_period; | |
96 | } | |
97 | ||
98 | /* set default value for buggy APs */ | |
99 | if (!elems->tim || bss->dtim_period == 0) | |
100 | bss->dtim_period = 1; | |
101 | ||
102 | bss->supp_rates_len = 0; | |
103 | if (elems->supp_rates) { | |
104 | clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; | |
105 | if (clen > elems->supp_rates_len) | |
106 | clen = elems->supp_rates_len; | |
107 | memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates, | |
108 | clen); | |
109 | bss->supp_rates_len += clen; | |
110 | } | |
111 | if (elems->ext_supp_rates) { | |
112 | clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; | |
113 | if (clen > elems->ext_supp_rates_len) | |
114 | clen = elems->ext_supp_rates_len; | |
115 | memcpy(&bss->supp_rates[bss->supp_rates_len], | |
116 | elems->ext_supp_rates, clen); | |
117 | bss->supp_rates_len += clen; | |
118 | } | |
119 | ||
5484e237 JB |
120 | bss->wmm_used = elems->wmm_param || elems->wmm_info; |
121 | ||
122 | if (!beacon) | |
123 | bss->last_probe_resp = jiffies; | |
124 | ||
5484e237 JB |
125 | return bss; |
126 | } | |
0a51b27e | 127 | |
7a947080 VT |
128 | void ieee80211_rx_bss_remove(struct ieee80211_sub_if_data *sdata, u8 *bssid, |
129 | int freq, u8 *ssid, u8 ssid_len) | |
130 | { | |
131 | struct ieee80211_bss *bss; | |
132 | struct ieee80211_local *local = sdata->local; | |
133 | ||
134 | bss = ieee80211_rx_bss_get(local, bssid, freq, ssid, ssid_len); | |
135 | if (bss) { | |
00d3f14c | 136 | cfg80211_unlink_bss(local->hw.wiphy, (void *)bss); |
7a947080 VT |
137 | ieee80211_rx_bss_put(local, bss); |
138 | } | |
139 | } | |
140 | ||
98c8fccf | 141 | ieee80211_rx_result |
c2b13452 JB |
142 | ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, |
143 | struct ieee80211_rx_status *rx_status) | |
98c8fccf JB |
144 | { |
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 */ | |
170 | if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) | |
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 | ||
a97b77b9 | 210 | void ieee80211_send_nullfunc(struct ieee80211_local *local, |
0a51b27e JB |
211 | struct ieee80211_sub_if_data *sdata, |
212 | int powersave) | |
213 | { | |
214 | struct sk_buff *skb; | |
215 | struct ieee80211_hdr *nullfunc; | |
216 | __le16 fc; | |
217 | ||
218 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24); | |
219 | if (!skb) { | |
220 | printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc " | |
221 | "frame\n", sdata->dev->name); | |
222 | return; | |
223 | } | |
224 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
225 | ||
226 | nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24); | |
227 | memset(nullfunc, 0, 24); | |
228 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | | |
229 | IEEE80211_FCTL_TODS); | |
230 | if (powersave) | |
231 | fc |= cpu_to_le16(IEEE80211_FCTL_PM); | |
232 | nullfunc->frame_control = fc; | |
233 | memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN); | |
234 | memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN); | |
235 | memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN); | |
236 | ||
e50db65c | 237 | ieee80211_tx_skb(sdata, skb, 0); |
0a51b27e JB |
238 | } |
239 | ||
2a519311 | 240 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
241 | { |
242 | struct ieee80211_local *local = hw_to_local(hw); | |
243 | struct ieee80211_sub_if_data *sdata; | |
0a51b27e | 244 | |
c2b13452 | 245 | if (WARN_ON(!local->hw_scanning && !local->sw_scanning)) |
5bc75728 JB |
246 | return; |
247 | ||
2a519311 JB |
248 | if (WARN_ON(!local->scan_req)) |
249 | return; | |
5bc75728 | 250 | |
2a519311 JB |
251 | if (local->scan_req != &local->int_scan_req) |
252 | cfg80211_scan_done(local->scan_req, aborted); | |
253 | local->scan_req = NULL; | |
254 | ||
255 | local->last_scan_completed = jiffies; | |
0a51b27e | 256 | |
c2b13452 JB |
257 | if (local->hw_scanning) { |
258 | local->hw_scanning = false; | |
e8975581 JB |
259 | /* |
260 | * Somebody might have requested channel change during scan | |
261 | * that we won't have acted upon, try now. ieee80211_hw_config | |
262 | * will set the flag based on actual changes. | |
263 | */ | |
264 | ieee80211_hw_config(local, 0); | |
0a51b27e JB |
265 | goto done; |
266 | } | |
267 | ||
c2b13452 | 268 | local->sw_scanning = false; |
e8975581 | 269 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
0a51b27e JB |
270 | |
271 | netif_tx_lock_bh(local->mdev); | |
272 | netif_addr_lock(local->mdev); | |
273 | local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC; | |
274 | local->ops->configure_filter(local_to_hw(local), | |
275 | FIF_BCN_PRBRESP_PROMISC, | |
276 | &local->filter_flags, | |
277 | local->mdev->mc_count, | |
278 | local->mdev->mc_list); | |
279 | ||
280 | netif_addr_unlock(local->mdev); | |
281 | netif_tx_unlock_bh(local->mdev); | |
282 | ||
078e1e60 JB |
283 | mutex_lock(&local->iflist_mtx); |
284 | list_for_each_entry(sdata, &local->interfaces, list) { | |
fb9ddbf0 JB |
285 | if (!netif_running(sdata->dev)) |
286 | continue; | |
287 | ||
0a51b27e | 288 | /* Tell AP we're back */ |
05c914fe | 289 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
0a51b27e JB |
290 | if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { |
291 | ieee80211_send_nullfunc(local, sdata, 0); | |
292 | netif_tx_wake_all_queues(sdata->dev); | |
293 | } | |
294 | } else | |
295 | netif_tx_wake_all_queues(sdata->dev); | |
078e1e60 | 296 | |
14b80724 JB |
297 | /* re-enable beaconing */ |
298 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
299 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
300 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
301 | ieee80211_if_config(sdata, | |
302 | IEEE80211_IFCC_BEACON_ENABLED); | |
0a51b27e | 303 | } |
078e1e60 | 304 | mutex_unlock(&local->iflist_mtx); |
0a51b27e JB |
305 | |
306 | done: | |
307 | ieee80211_mlme_notify_scan_completed(local); | |
472dbc45 | 308 | ieee80211_mesh_notify_scan_completed(local); |
0a51b27e JB |
309 | } |
310 | EXPORT_SYMBOL(ieee80211_scan_completed); | |
311 | ||
c2b13452 | 312 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
313 | { |
314 | struct ieee80211_local *local = | |
315 | container_of(work, struct ieee80211_local, scan_work.work); | |
316 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; | |
0a51b27e | 317 | struct ieee80211_channel *chan; |
2a519311 | 318 | int skip, i; |
0a51b27e JB |
319 | unsigned long next_delay = 0; |
320 | ||
5bc75728 JB |
321 | /* |
322 | * Avoid re-scheduling when the sdata is going away. | |
323 | */ | |
324 | if (!netif_running(sdata->dev)) | |
0a51b27e JB |
325 | return; |
326 | ||
327 | switch (local->scan_state) { | |
328 | case SCAN_SET_CHANNEL: | |
0a51b27e | 329 | /* if no more bands/channels left, complete scan */ |
2a519311 JB |
330 | if (local->scan_channel_idx >= local->scan_req->n_channels) { |
331 | ieee80211_scan_completed(local_to_hw(local), false); | |
0a51b27e JB |
332 | return; |
333 | } | |
334 | skip = 0; | |
2a519311 | 335 | chan = local->scan_req->channels[local->scan_channel_idx]; |
0a51b27e JB |
336 | |
337 | if (chan->flags & IEEE80211_CHAN_DISABLED || | |
05c914fe | 338 | (sdata->vif.type == NL80211_IFTYPE_ADHOC && |
0a51b27e JB |
339 | chan->flags & IEEE80211_CHAN_NO_IBSS)) |
340 | skip = 1; | |
341 | ||
342 | if (!skip) { | |
343 | local->scan_channel = chan; | |
e8975581 JB |
344 | if (ieee80211_hw_config(local, |
345 | IEEE80211_CONF_CHANGE_CHANNEL)) | |
0a51b27e | 346 | skip = 1; |
0a51b27e JB |
347 | } |
348 | ||
349 | /* advance state machine to next channel/band */ | |
350 | local->scan_channel_idx++; | |
0a51b27e JB |
351 | |
352 | if (skip) | |
353 | break; | |
354 | ||
355 | next_delay = IEEE80211_PROBE_DELAY + | |
356 | usecs_to_jiffies(local->hw.channel_change_time); | |
357 | local->scan_state = SCAN_SEND_PROBE; | |
358 | break; | |
359 | case SCAN_SEND_PROBE: | |
360 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
361 | local->scan_state = SCAN_SET_CHANNEL; | |
362 | ||
2a519311 JB |
363 | if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN || |
364 | !local->scan_req->n_ssids) | |
0a51b27e | 365 | break; |
2a519311 JB |
366 | for (i = 0; i < local->scan_req->n_ssids; i++) |
367 | ieee80211_send_probe_req( | |
368 | sdata, NULL, | |
369 | local->scan_req->ssids[i].ssid, | |
370 | local->scan_req->ssids[i].ssid_len); | |
0a51b27e JB |
371 | next_delay = IEEE80211_CHANNEL_TIME; |
372 | break; | |
373 | } | |
374 | ||
5bc75728 JB |
375 | queue_delayed_work(local->hw.workqueue, &local->scan_work, |
376 | next_delay); | |
0a51b27e JB |
377 | } |
378 | ||
379 | ||
c2b13452 | 380 | int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata, |
2a519311 | 381 | struct cfg80211_scan_request *req) |
0a51b27e JB |
382 | { |
383 | struct ieee80211_local *local = scan_sdata->local; | |
384 | struct ieee80211_sub_if_data *sdata; | |
385 | ||
2a519311 | 386 | if (!req) |
0a51b27e JB |
387 | return -EINVAL; |
388 | ||
2a519311 JB |
389 | if (local->scan_req && local->scan_req != req) |
390 | return -EBUSY; | |
391 | ||
392 | local->scan_req = req; | |
393 | ||
0a51b27e JB |
394 | /* MLME-SCAN.request (page 118) page 144 (11.1.3.1) |
395 | * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS | |
396 | * BSSID: MACAddress | |
397 | * SSID | |
398 | * ScanType: ACTIVE, PASSIVE | |
399 | * ProbeDelay: delay (in microseconds) to be used prior to transmitting | |
400 | * a Probe frame during active scanning | |
401 | * ChannelList | |
402 | * MinChannelTime (>= ProbeDelay), in TU | |
403 | * MaxChannelTime: (>= MinChannelTime), in TU | |
404 | */ | |
405 | ||
406 | /* MLME-SCAN.confirm | |
407 | * BSSDescriptionSet | |
408 | * ResultCode: SUCCESS, INVALID_PARAMETERS | |
409 | */ | |
410 | ||
c2b13452 | 411 | if (local->sw_scanning || local->hw_scanning) { |
0a51b27e JB |
412 | if (local->scan_sdata == scan_sdata) |
413 | return 0; | |
414 | return -EBUSY; | |
415 | } | |
416 | ||
417 | if (local->ops->hw_scan) { | |
5bc75728 JB |
418 | int rc; |
419 | ||
c2b13452 | 420 | local->hw_scanning = true; |
2a519311 | 421 | rc = local->ops->hw_scan(local_to_hw(local), req); |
5bc75728 | 422 | if (rc) { |
c2b13452 | 423 | local->hw_scanning = false; |
5bc75728 | 424 | return rc; |
0a51b27e | 425 | } |
5bc75728 JB |
426 | local->scan_sdata = scan_sdata; |
427 | return 0; | |
0a51b27e JB |
428 | } |
429 | ||
c2b13452 | 430 | local->sw_scanning = true; |
0a51b27e | 431 | |
078e1e60 JB |
432 | mutex_lock(&local->iflist_mtx); |
433 | list_for_each_entry(sdata, &local->interfaces, list) { | |
fb9ddbf0 JB |
434 | if (!netif_running(sdata->dev)) |
435 | continue; | |
436 | ||
14b80724 JB |
437 | /* disable beaconing */ |
438 | if (sdata->vif.type == NL80211_IFTYPE_AP || | |
439 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
440 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
441 | ieee80211_if_config(sdata, | |
442 | IEEE80211_IFCC_BEACON_ENABLED); | |
078e1e60 | 443 | |
05c914fe | 444 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
0a51b27e JB |
445 | if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) { |
446 | netif_tx_stop_all_queues(sdata->dev); | |
447 | ieee80211_send_nullfunc(local, sdata, 1); | |
448 | } | |
449 | } else | |
450 | netif_tx_stop_all_queues(sdata->dev); | |
451 | } | |
078e1e60 | 452 | mutex_unlock(&local->iflist_mtx); |
0a51b27e | 453 | |
0a51b27e JB |
454 | local->scan_state = SCAN_SET_CHANNEL; |
455 | local->scan_channel_idx = 0; | |
0a51b27e | 456 | local->scan_sdata = scan_sdata; |
2a519311 | 457 | local->scan_req = req; |
0a51b27e JB |
458 | |
459 | netif_addr_lock_bh(local->mdev); | |
460 | local->filter_flags |= FIF_BCN_PRBRESP_PROMISC; | |
461 | local->ops->configure_filter(local_to_hw(local), | |
462 | FIF_BCN_PRBRESP_PROMISC, | |
463 | &local->filter_flags, | |
464 | local->mdev->mc_count, | |
465 | local->mdev->mc_list); | |
466 | netif_addr_unlock_bh(local->mdev); | |
467 | ||
468 | /* TODO: start scan as soon as all nullfunc frames are ACKed */ | |
469 | queue_delayed_work(local->hw.workqueue, &local->scan_work, | |
470 | IEEE80211_CHANNEL_TIME); | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
475 | ||
c2b13452 | 476 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
2a519311 | 477 | struct cfg80211_scan_request *req) |
0a51b27e | 478 | { |
0a51b27e | 479 | struct ieee80211_local *local = sdata->local; |
9116dd01 | 480 | struct ieee80211_if_sta *ifsta; |
0a51b27e | 481 | |
2a519311 JB |
482 | if (!req) |
483 | return -EINVAL; | |
484 | ||
485 | if (local->scan_req && local->scan_req != req) | |
486 | return -EBUSY; | |
487 | ||
488 | local->scan_req = req; | |
489 | ||
05c914fe | 490 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
2a519311 | 491 | return ieee80211_start_scan(sdata, req); |
0a51b27e | 492 | |
9116dd01 JB |
493 | /* |
494 | * STA has a state machine that might need to defer scanning | |
495 | * while it's trying to associate/authenticate, therefore we | |
496 | * queue it up to the state machine in that case. | |
497 | */ | |
498 | ||
c2b13452 | 499 | if (local->sw_scanning || local->hw_scanning) { |
0a51b27e JB |
500 | if (local->scan_sdata == sdata) |
501 | return 0; | |
502 | return -EBUSY; | |
503 | } | |
504 | ||
9116dd01 | 505 | ifsta = &sdata->u.sta; |
0a51b27e JB |
506 | set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request); |
507 | queue_work(local->hw.workqueue, &ifsta->work); | |
9116dd01 | 508 | |
0a51b27e JB |
509 | return 0; |
510 | } |