Commit | Line | Data |
---|---|---|
0a51b27e | 1 | /* |
5484e237 JB |
2 | * Scanning implementation |
3 | * | |
0a51b27e JB |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
5 | * Copyright 2004, Instant802 Networks, Inc. | |
6 | * Copyright 2005, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
0a51b27e | 15 | #include <linux/if_arp.h> |
888d04df | 16 | #include <linux/etherdevice.h> |
078e1e60 | 17 | #include <linux/rtnetlink.h> |
e8db0be1 | 18 | #include <linux/pm_qos.h> |
df13cce5 | 19 | #include <net/sch_generic.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
bc3b2d7f | 21 | #include <linux/export.h> |
0a51b27e | 22 | #include <net/mac80211.h> |
0a51b27e JB |
23 | |
24 | #include "ieee80211_i.h" | |
24487981 | 25 | #include "driver-ops.h" |
5484e237 | 26 | #include "mesh.h" |
0a51b27e JB |
27 | |
28 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
29 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
3f892b61 | 30 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) |
0a51b27e | 31 | |
5484e237 | 32 | void ieee80211_rx_bss_put(struct ieee80211_local *local, |
c2b13452 | 33 | struct ieee80211_bss *bss) |
5484e237 | 34 | { |
0c1ad2ca JB |
35 | if (!bss) |
36 | return; | |
5b112d3d JB |
37 | cfg80211_put_bss(local->hw.wiphy, |
38 | container_of((void *)bss, struct cfg80211_bss, priv)); | |
5484e237 JB |
39 | } |
40 | ||
ab13315a KV |
41 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
42 | { | |
43 | u8 qos_info; | |
44 | ||
45 | if (elems->wmm_info && elems->wmm_info_len == 7 | |
46 | && elems->wmm_info[5] == 1) | |
47 | qos_info = elems->wmm_info[6]; | |
48 | else if (elems->wmm_param && elems->wmm_param_len == 24 | |
49 | && elems->wmm_param[5] == 1) | |
50 | qos_info = elems->wmm_param[6]; | |
51 | else | |
52 | /* no valid wmm information or parameter element found */ | |
53 | return false; | |
54 | ||
55 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; | |
56 | } | |
57 | ||
c2b13452 | 58 | struct ieee80211_bss * |
5484e237 JB |
59 | ieee80211_bss_info_update(struct ieee80211_local *local, |
60 | struct ieee80211_rx_status *rx_status, | |
d45c4172 | 61 | struct ieee80211_mgmt *mgmt, size_t len, |
5484e237 | 62 | struct ieee802_11_elems *elems, |
d45c4172 | 63 | struct ieee80211_channel *channel) |
5484e237 | 64 | { |
d45c4172 | 65 | bool beacon = ieee80211_is_beacon(mgmt->frame_control); |
0c1ad2ca | 66 | struct cfg80211_bss *cbss; |
c2b13452 | 67 | struct ieee80211_bss *bss; |
f0b058b6 | 68 | int clen, srlen; |
2a519311 JB |
69 | s32 signal = 0; |
70 | ||
77965c97 | 71 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 72 | signal = rx_status->signal * 100; |
77965c97 | 73 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 74 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 75 | |
0c1ad2ca JB |
76 | cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
77 | mgmt, len, signal, GFP_ATOMIC); | |
0c1ad2ca | 78 | if (!cbss) |
00d3f14c JB |
79 | return NULL; |
80 | ||
0c1ad2ca | 81 | bss = (void *)cbss->priv; |
5484e237 | 82 | |
ef429dad JB |
83 | if (beacon) |
84 | bss->device_ts_beacon = rx_status->device_timestamp; | |
85 | else | |
86 | bss->device_ts_presp = rx_status->device_timestamp; | |
8c358bcd | 87 | |
fcff4f10 PS |
88 | if (elems->parse_error) { |
89 | if (beacon) | |
90 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
91 | else | |
92 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
93 | } else { | |
94 | if (beacon) | |
95 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
96 | else | |
97 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
98 | } | |
99 | ||
5484e237 | 100 | /* save the ERP value so that it is available at association time */ |
1946bed9 JB |
101 | if (elems->erp_info && (!elems->parse_error || |
102 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 103 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 104 | bss->has_erp_value = true; |
fcff4f10 PS |
105 | if (!elems->parse_error) |
106 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
107 | } |
108 | ||
f0b058b6 | 109 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
110 | if (!elems->parse_error || |
111 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
112 | srlen = 0; | |
113 | if (elems->supp_rates) { | |
114 | clen = IEEE80211_MAX_SUPP_RATES; | |
115 | if (clen > elems->supp_rates_len) | |
116 | clen = elems->supp_rates_len; | |
117 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
118 | srlen += clen; | |
119 | } | |
120 | if (elems->ext_supp_rates) { | |
121 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
122 | if (clen > elems->ext_supp_rates_len) | |
123 | clen = elems->ext_supp_rates_len; | |
124 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
125 | clen); | |
126 | srlen += clen; | |
127 | } | |
128 | if (srlen) { | |
129 | bss->supp_rates_len = srlen; | |
130 | if (!elems->parse_error) | |
131 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
132 | } | |
5484e237 | 133 | } |
5484e237 | 134 | |
fcff4f10 PS |
135 | if (!elems->parse_error || |
136 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
137 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
138 | bss->uapsd_supported = is_uapsd_supported(elems); | |
139 | if (!elems->parse_error) | |
140 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
141 | } | |
5484e237 | 142 | |
5484e237 JB |
143 | return bss; |
144 | } | |
0a51b27e | 145 | |
d48b2968 | 146 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 147 | { |
f1d58c25 | 148 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
149 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
150 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 151 | struct ieee80211_bss *bss; |
98c8fccf JB |
152 | u8 *elements; |
153 | struct ieee80211_channel *channel; | |
154 | size_t baselen; | |
98c8fccf JB |
155 | struct ieee802_11_elems elems; |
156 | ||
d48b2968 JB |
157 | if (skb->len < 24 || |
158 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
159 | !ieee80211_is_beacon(mgmt->frame_control))) | |
160 | return; | |
98c8fccf | 161 | |
d48b2968 JB |
162 | sdata1 = rcu_dereference(local->scan_sdata); |
163 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 164 | |
d48b2968 JB |
165 | if (likely(!sdata1 && !sdata2)) |
166 | return; | |
98c8fccf | 167 | |
d48b2968 | 168 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
98c8fccf | 169 | /* ignore ProbeResp to foreign address */ |
d48b2968 JB |
170 | if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && |
171 | (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) | |
172 | return; | |
98c8fccf | 173 | |
98c8fccf JB |
174 | elements = mgmt->u.probe_resp.variable; |
175 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
176 | } else { | |
98c8fccf JB |
177 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
178 | elements = mgmt->u.beacon.variable; | |
179 | } | |
180 | ||
98c8fccf | 181 | if (baselen > skb->len) |
d48b2968 | 182 | return; |
98c8fccf | 183 | |
b2e506bf | 184 | ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); |
98c8fccf | 185 | |
0172bb75 | 186 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
187 | |
188 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 189 | return; |
98c8fccf | 190 | |
d48b2968 | 191 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 192 | mgmt, skb->len, &elems, |
d45c4172 | 193 | channel); |
d048e503 | 194 | if (bss) |
d48b2968 | 195 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
196 | } |
197 | ||
4d36ec58 JB |
198 | /* return false if no more work */ |
199 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
200 | { | |
201 | struct cfg80211_scan_request *req = local->scan_req; | |
202 | enum ieee80211_band band; | |
203 | int i, ielen, n_chans; | |
204 | ||
715a606d EG |
205 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
206 | return false; | |
207 | ||
4d36ec58 JB |
208 | do { |
209 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
210 | return false; | |
211 | ||
212 | band = local->hw_scan_band; | |
213 | n_chans = 0; | |
214 | for (i = 0; i < req->n_channels; i++) { | |
215 | if (req->channels[i]->band == band) { | |
216 | local->hw_scan_req->channels[n_chans] = | |
217 | req->channels[i]; | |
218 | n_chans++; | |
219 | } | |
220 | } | |
221 | ||
222 | local->hw_scan_band++; | |
223 | } while (!n_chans); | |
224 | ||
225 | local->hw_scan_req->n_channels = n_chans; | |
226 | ||
227 | ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, | |
c604b9f2 | 228 | local->hw_scan_ies_bufsize, |
8ee31080 | 229 | req->ie, req->ie_len, band, |
85a237fe | 230 | req->rates[band], 0); |
4d36ec58 | 231 | local->hw_scan_req->ie_len = ielen; |
dcd83976 | 232 | local->hw_scan_req->no_cck = req->no_cck; |
4d36ec58 JB |
233 | |
234 | return true; | |
235 | } | |
236 | ||
d07bfd8b | 237 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, |
e229f844 | 238 | bool was_hw_scan) |
0a51b27e JB |
239 | { |
240 | struct ieee80211_local *local = hw_to_local(hw); | |
0a51b27e | 241 | |
e229f844 | 242 | lockdep_assert_held(&local->mtx); |
5bc75728 | 243 | |
6d3560d4 JB |
244 | /* |
245 | * It's ok to abort a not-yet-running scan (that | |
246 | * we have one at all will be verified by checking | |
247 | * local->scan_req next), but not to complete it | |
248 | * successfully. | |
249 | */ | |
250 | if (WARN_ON(!local->scanning && !aborted)) | |
251 | aborted = true; | |
5bc75728 | 252 | |
e229f844 | 253 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 254 | return; |
de95a54b | 255 | |
4d36ec58 | 256 | if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
257 | int rc; |
258 | ||
259 | rc = drv_hw_scan(local, | |
260 | rcu_dereference_protected(local->scan_sdata, | |
261 | lockdep_is_held(&local->mtx)), | |
262 | local->hw_scan_req); | |
263 | ||
6eb11a9a | 264 | if (rc == 0) |
d07bfd8b | 265 | return; |
4d36ec58 JB |
266 | } |
267 | ||
268 | kfree(local->hw_scan_req); | |
269 | local->hw_scan_req = NULL; | |
f3b85252 | 270 | |
5ba63533 | 271 | if (local->scan_req != local->int_scan_req) |
2a519311 JB |
272 | cfg80211_scan_done(local->scan_req, aborted); |
273 | local->scan_req = NULL; | |
3aa569c3 | 274 | rcu_assign_pointer(local->scan_sdata, NULL); |
2a519311 | 275 | |
fbe9c429 | 276 | local->scanning = 0; |
58905ca5 | 277 | local->scan_channel = NULL; |
f3b85252 | 278 | |
07ef03ee JB |
279 | /* Set power back to normal operating levels. */ |
280 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 281 | |
e229f844 SG |
282 | if (!was_hw_scan) { |
283 | ieee80211_configure_filter(local); | |
284 | drv_sw_scan_complete(local); | |
aacde9ee | 285 | ieee80211_offchannel_return(local); |
e229f844 | 286 | } |
0a51b27e | 287 | |
5cff20e6 | 288 | ieee80211_recalc_idle(local); |
e229f844 | 289 | |
0a51b27e | 290 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 291 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 292 | ieee80211_mesh_notify_scan_completed(local); |
2eb278e0 | 293 | ieee80211_start_next_roc(local); |
0a51b27e | 294 | } |
8789d459 JB |
295 | |
296 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
297 | { | |
298 | struct ieee80211_local *local = hw_to_local(hw); | |
299 | ||
300 | trace_api_scan_completed(local, aborted); | |
301 | ||
302 | set_bit(SCAN_COMPLETED, &local->scanning); | |
303 | if (aborted) | |
304 | set_bit(SCAN_ABORTED, &local->scanning); | |
305 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
306 | } | |
0a51b27e JB |
307 | EXPORT_SYMBOL(ieee80211_scan_completed); |
308 | ||
f3b85252 JB |
309 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
310 | { | |
fe57d9f5 JB |
311 | /* Software scan is not supported in multi-channel cases */ |
312 | if (local->use_chanctx) | |
313 | return -EOPNOTSUPP; | |
314 | ||
f3b85252 JB |
315 | /* |
316 | * Hardware/driver doesn't support hw_scan, so use software | |
317 | * scanning instead. First send a nullfunc frame with power save | |
318 | * bit on so that AP will buffer the frames for us while we are not | |
319 | * listening, then send probe requests to each channel and wait for | |
320 | * the responses. After all channels are scanned, tune back to the | |
321 | * original channel and send a nullfunc frame with power save bit | |
322 | * off to trigger the AP to send us all the buffered frames. | |
323 | * | |
324 | * Note that while local->sw_scanning is true everything else but | |
325 | * nullfunc frames and probe requests will be dropped in | |
326 | * ieee80211_tx_h_check_assoc(). | |
327 | */ | |
24487981 | 328 | drv_sw_scan_start(local); |
f3b85252 | 329 | |
de312db3 | 330 | local->leave_oper_channel_time = jiffies; |
977923b0 | 331 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
332 | local->scan_channel_idx = 0; |
333 | ||
aacde9ee | 334 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 335 | |
9c35d7d2 | 336 | /* ensure nullfunc is transmitted before leaving operating channel */ |
39ecc01d | 337 | ieee80211_flush_queues(local, NULL); |
9c35d7d2 | 338 | |
3ac64bee | 339 | ieee80211_configure_filter(local); |
f3b85252 | 340 | |
59bdf3b0 BG |
341 | /* We need to set power level at maximum rate for scanning. */ |
342 | ieee80211_hw_config(local, 0); | |
343 | ||
42935eca | 344 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 345 | &local->scan_work, 0); |
f3b85252 JB |
346 | |
347 | return 0; | |
348 | } | |
349 | ||
133d40f9 SG |
350 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
351 | struct ieee80211_sub_if_data *sdata) | |
352 | { | |
164eb02d SW |
353 | if (local->radar_detect_enabled) |
354 | return false; | |
355 | ||
2eb278e0 | 356 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
357 | return false; |
358 | ||
359 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
360 | sdata->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | | |
361 | IEEE80211_STA_CONNECTION_POLL)) | |
362 | return false; | |
363 | ||
364 | return true; | |
365 | } | |
366 | ||
367 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
368 | { | |
369 | lockdep_assert_held(&local->mtx); | |
370 | ||
371 | if (!local->scan_req || local->scanning) | |
372 | return; | |
373 | ||
e2fd5dbc JB |
374 | if (!ieee80211_can_scan(local, |
375 | rcu_dereference_protected( | |
376 | local->scan_sdata, | |
377 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
378 | return; |
379 | ||
380 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
381 | round_jiffies_relative(0)); | |
382 | } | |
f3b85252 | 383 | |
8a690674 BG |
384 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
385 | unsigned long *next_delay) | |
386 | { | |
387 | int i; | |
e2fd5dbc | 388 | struct ieee80211_sub_if_data *sdata; |
675a0b04 | 389 | enum ieee80211_band band = local->hw.conf.chandef.chan->band; |
6c17b77b SF |
390 | u32 tx_flags; |
391 | ||
392 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; | |
393 | if (local->scan_req->no_cck) | |
394 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; | |
8a690674 | 395 | |
e2fd5dbc | 396 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 397 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 398 | |
8a690674 BG |
399 | for (i = 0; i < local->scan_req->n_ssids; i++) |
400 | ieee80211_send_probe_req( | |
401 | sdata, NULL, | |
402 | local->scan_req->ssids[i].ssid, | |
403 | local->scan_req->ssids[i].ssid_len, | |
404 | local->scan_req->ie, local->scan_req->ie_len, | |
405 | local->scan_req->rates[band], false, | |
675a0b04 | 406 | tx_flags, local->hw.conf.chandef.chan, true); |
8a690674 BG |
407 | |
408 | /* | |
409 | * After sending probe requests, wait for probe responses | |
410 | * on the channel. | |
411 | */ | |
412 | *next_delay = IEEE80211_CHANNEL_TIME; | |
413 | local->next_scan_state = SCAN_DECISION; | |
414 | } | |
415 | ||
f3b85252 JB |
416 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
417 | struct cfg80211_scan_request *req) | |
418 | { | |
419 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
420 | int rc; |
421 | ||
e229f844 SG |
422 | lockdep_assert_held(&local->mtx); |
423 | ||
f3b85252 JB |
424 | if (local->scan_req) |
425 | return -EBUSY; | |
426 | ||
133d40f9 | 427 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 428 | /* wait for the work to finish/time out */ |
c0ce77b8 | 429 | local->scan_req = req; |
e2fd5dbc | 430 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
431 | return 0; |
432 | } | |
433 | ||
f3b85252 JB |
434 | if (local->ops->hw_scan) { |
435 | u8 *ies; | |
f3b85252 | 436 | |
c604b9f2 JB |
437 | local->hw_scan_ies_bufsize = 2 + IEEE80211_MAX_SSID_LEN + |
438 | local->scan_ies_len + | |
439 | req->ie_len; | |
4d36ec58 JB |
440 | local->hw_scan_req = kmalloc( |
441 | sizeof(*local->hw_scan_req) + | |
442 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 443 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 444 | if (!local->hw_scan_req) |
f3b85252 JB |
445 | return -ENOMEM; |
446 | ||
4d36ec58 JB |
447 | local->hw_scan_req->ssids = req->ssids; |
448 | local->hw_scan_req->n_ssids = req->n_ssids; | |
449 | ies = (u8 *)local->hw_scan_req + | |
450 | sizeof(*local->hw_scan_req) + | |
451 | req->n_channels * sizeof(req->channels[0]); | |
452 | local->hw_scan_req->ie = ies; | |
cd2bb512 | 453 | local->hw_scan_req->flags = req->flags; |
4d36ec58 JB |
454 | |
455 | local->hw_scan_band = 0; | |
6e7e6213 JL |
456 | |
457 | /* | |
458 | * After allocating local->hw_scan_req, we must | |
459 | * go through until ieee80211_prep_hw_scan(), so | |
460 | * anything that might be changed here and leave | |
461 | * this function early must not go after this | |
462 | * allocation. | |
463 | */ | |
f3b85252 JB |
464 | } |
465 | ||
466 | local->scan_req = req; | |
e2fd5dbc | 467 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 468 | |
8a690674 | 469 | if (local->ops->hw_scan) { |
fbe9c429 | 470 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 471 | } else if ((req->n_channels == 1) && |
675a0b04 | 472 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
473 | /* |
474 | * If we are scanning only on the operating channel | |
475 | * then we do not need to stop normal activities | |
8a690674 BG |
476 | */ |
477 | unsigned long next_delay; | |
478 | ||
479 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
480 | ||
481 | ieee80211_recalc_idle(local); | |
482 | ||
483 | /* Notify driver scan is starting, keep order of operations | |
484 | * same as normal software scan, in case that matters. */ | |
485 | drv_sw_scan_start(local); | |
486 | ||
487 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
488 | ||
489 | /* We need to ensure power level is at max for scanning. */ | |
490 | ieee80211_hw_config(local, 0); | |
491 | ||
492 | if ((req->channels[0]->flags & | |
493 | IEEE80211_CHAN_PASSIVE_SCAN) || | |
494 | !local->scan_req->n_ssids) { | |
495 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
496 | } else { | |
497 | ieee80211_scan_state_send_probe(local, &next_delay); | |
498 | next_delay = IEEE80211_CHANNEL_TIME; | |
499 | } | |
500 | ||
501 | /* Now, just wait a bit and we are all done! */ | |
502 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
503 | next_delay); | |
504 | return 0; | |
505 | } else { | |
506 | /* Do normal software scan */ | |
fbe9c429 | 507 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 508 | } |
6e7e6213 | 509 | |
5cff20e6 | 510 | ieee80211_recalc_idle(local); |
f3b85252 | 511 | |
4d36ec58 JB |
512 | if (local->ops->hw_scan) { |
513 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 514 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
4d36ec58 | 515 | } else |
f3b85252 JB |
516 | rc = ieee80211_start_sw_scan(local); |
517 | ||
f3b85252 | 518 | if (rc) { |
4d36ec58 JB |
519 | kfree(local->hw_scan_req); |
520 | local->hw_scan_req = NULL; | |
fbe9c429 | 521 | local->scanning = 0; |
f3b85252 | 522 | |
5cff20e6 JB |
523 | ieee80211_recalc_idle(local); |
524 | ||
f3b85252 | 525 | local->scan_req = NULL; |
e2fd5dbc | 526 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
527 | } |
528 | ||
529 | return rc; | |
530 | } | |
531 | ||
df13cce5 HS |
532 | static unsigned long |
533 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
534 | { | |
535 | /* | |
536 | * TODO: channel switching also consumes quite some time, | |
537 | * add that delay as well to get a better estimation | |
538 | */ | |
539 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) | |
540 | return IEEE80211_PASSIVE_CHANNEL_TIME; | |
541 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
542 | } | |
543 | ||
e229f844 SG |
544 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
545 | unsigned long *next_delay) | |
7d3be3cc | 546 | { |
142b9f50 | 547 | bool associated = false; |
df13cce5 HS |
548 | bool tx_empty = true; |
549 | bool bad_latency; | |
142b9f50 | 550 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 551 | struct ieee80211_channel *next_chan; |
cd2bb512 | 552 | enum mac80211_scan_state next_scan_state; |
142b9f50 | 553 | |
df13cce5 HS |
554 | /* |
555 | * check if at least one STA interface is associated, | |
556 | * check if at least one STA interface has pending tx frames | |
557 | * and grab the lowest used beacon interval | |
558 | */ | |
142b9f50 HS |
559 | mutex_lock(&local->iflist_mtx); |
560 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 561 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
562 | continue; |
563 | ||
564 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
565 | if (sdata->u.mgd.associated) { | |
566 | associated = true; | |
df13cce5 | 567 | |
df13cce5 HS |
568 | if (!qdisc_all_tx_empty(sdata->dev)) { |
569 | tx_empty = false; | |
570 | break; | |
571 | } | |
142b9f50 HS |
572 | } |
573 | } | |
574 | } | |
575 | mutex_unlock(&local->iflist_mtx); | |
576 | ||
b23b025f BG |
577 | next_chan = local->scan_req->channels[local->scan_channel_idx]; |
578 | ||
a80f7c0b | 579 | /* |
07ef03ee JB |
580 | * we're currently scanning a different channel, let's |
581 | * see if we can scan another channel without interfering | |
582 | * with the current traffic situation. | |
583 | * | |
3f892b61 | 584 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 585 | */ |
a80f7c0b | 586 | |
07ef03ee | 587 | bad_latency = time_after(jiffies + |
3f892b61 SG |
588 | ieee80211_scan_get_channel_time(next_chan), |
589 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 590 | |
cd2bb512 SL |
591 | if (associated && !tx_empty) { |
592 | if (local->scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) | |
593 | next_scan_state = SCAN_ABORT; | |
594 | else | |
595 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 596 | } else if (associated && bad_latency) { |
cd2bb512 SL |
597 | next_scan_state = SCAN_SUSPEND; |
598 | } else { | |
599 | next_scan_state = SCAN_SET_CHANNEL; | |
600 | } | |
601 | ||
602 | local->next_scan_state = next_scan_state; | |
142b9f50 | 603 | |
07ef03ee | 604 | *next_delay = 0; |
142b9f50 HS |
605 | } |
606 | ||
2fb3f028 HS |
607 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
608 | unsigned long *next_delay) | |
609 | { | |
610 | int skip; | |
611 | struct ieee80211_channel *chan; | |
2fb3f028 | 612 | |
7d3be3cc HS |
613 | skip = 0; |
614 | chan = local->scan_req->channels[local->scan_channel_idx]; | |
615 | ||
584991dc | 616 | local->scan_channel = chan; |
b23b025f | 617 | |
07ef03ee JB |
618 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
619 | skip = 1; | |
7d3be3cc | 620 | |
7d3be3cc HS |
621 | /* advance state machine to next channel/band */ |
622 | local->scan_channel_idx++; | |
623 | ||
0ee9c13c HS |
624 | if (skip) { |
625 | /* if we skip this channel return to the decision state */ | |
626 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 627 | return; |
0ee9c13c | 628 | } |
7d3be3cc HS |
629 | |
630 | /* | |
631 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
632 | * (which unfortunately doesn't say _why_ step a) is done, | |
633 | * but it waits for the probe delay or until a frame is | |
634 | * received - and the received frame would update the NAV). | |
635 | * For now, we do not support waiting until a frame is | |
636 | * received. | |
637 | * | |
638 | * In any case, it is not necessary for a passive scan. | |
639 | */ | |
640 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || | |
641 | !local->scan_req->n_ssids) { | |
642 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
977923b0 | 643 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 644 | return; |
7d3be3cc HS |
645 | } |
646 | ||
2fb3f028 | 647 | /* active scan, send probes */ |
7d3be3cc | 648 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 649 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
650 | } |
651 | ||
07ef03ee JB |
652 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
653 | unsigned long *next_delay) | |
654 | { | |
655 | /* switch back to the operating channel */ | |
656 | local->scan_channel = NULL; | |
657 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
658 | ||
aacde9ee SG |
659 | /* disable PS */ |
660 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
661 | |
662 | *next_delay = HZ / 5; | |
663 | /* afterwards, resume scan & go to next channel */ | |
664 | local->next_scan_state = SCAN_RESUME; | |
665 | } | |
666 | ||
667 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
668 | unsigned long *next_delay) | |
669 | { | |
aacde9ee | 670 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
671 | |
672 | if (local->ops->flush) { | |
39ecc01d | 673 | ieee80211_flush_queues(local, NULL); |
07ef03ee JB |
674 | *next_delay = 0; |
675 | } else | |
676 | *next_delay = HZ / 10; | |
677 | ||
678 | /* remember when we left the operating channel */ | |
679 | local->leave_oper_channel_time = jiffies; | |
680 | ||
681 | /* advance to the next channel to be scanned */ | |
de2ee84d | 682 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
683 | } |
684 | ||
c2b13452 | 685 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
686 | { |
687 | struct ieee80211_local *local = | |
688 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 689 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 690 | unsigned long next_delay = 0; |
d07bfd8b | 691 | bool aborted, hw_scan; |
0a51b27e | 692 | |
259b62e3 | 693 | mutex_lock(&local->mtx); |
8789d459 | 694 | |
e2fd5dbc JB |
695 | sdata = rcu_dereference_protected(local->scan_sdata, |
696 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 697 | |
8a690674 BG |
698 | /* When scanning on-channel, the first-callback means completed. */ |
699 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
700 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
701 | goto out_complete; | |
702 | } | |
703 | ||
259b62e3 | 704 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 705 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 706 | goto out_complete; |
8789d459 JB |
707 | } |
708 | ||
259b62e3 SG |
709 | if (!sdata || !local->scan_req) |
710 | goto out; | |
f3b85252 | 711 | |
fbe9c429 | 712 | if (local->scan_req && !local->scanning) { |
f3b85252 JB |
713 | struct cfg80211_scan_request *req = local->scan_req; |
714 | int rc; | |
715 | ||
716 | local->scan_req = NULL; | |
e2fd5dbc | 717 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
718 | |
719 | rc = __ieee80211_start_scan(sdata, req); | |
259b62e3 | 720 | if (rc) { |
3aed49ef SG |
721 | /* need to complete scan in cfg80211 */ |
722 | local->scan_req = req; | |
259b62e3 SG |
723 | aborted = true; |
724 | goto out_complete; | |
725 | } else | |
726 | goto out; | |
f3b85252 JB |
727 | } |
728 | ||
5bc75728 JB |
729 | /* |
730 | * Avoid re-scheduling when the sdata is going away. | |
731 | */ | |
9607e6b6 | 732 | if (!ieee80211_sdata_running(sdata)) { |
259b62e3 SG |
733 | aborted = true; |
734 | goto out_complete; | |
f3b85252 | 735 | } |
0a51b27e | 736 | |
f502d09b HS |
737 | /* |
738 | * as long as no delay is required advance immediately | |
739 | * without scheduling a new work | |
740 | */ | |
741 | do { | |
c29acf20 RM |
742 | if (!ieee80211_sdata_running(sdata)) { |
743 | aborted = true; | |
744 | goto out_complete; | |
745 | } | |
746 | ||
977923b0 | 747 | switch (local->next_scan_state) { |
2fb3f028 | 748 | case SCAN_DECISION: |
e229f844 SG |
749 | /* if no more bands/channels left, complete scan */ |
750 | if (local->scan_channel_idx >= local->scan_req->n_channels) { | |
751 | aborted = false; | |
752 | goto out_complete; | |
753 | } | |
754 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 755 | break; |
2fb3f028 HS |
756 | case SCAN_SET_CHANNEL: |
757 | ieee80211_scan_state_set_channel(local, &next_delay); | |
758 | break; | |
f502d09b HS |
759 | case SCAN_SEND_PROBE: |
760 | ieee80211_scan_state_send_probe(local, &next_delay); | |
761 | break; | |
07ef03ee JB |
762 | case SCAN_SUSPEND: |
763 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 764 | break; |
07ef03ee JB |
765 | case SCAN_RESUME: |
766 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 767 | break; |
cd2bb512 SL |
768 | case SCAN_ABORT: |
769 | aborted = true; | |
770 | goto out_complete; | |
f502d09b HS |
771 | } |
772 | } while (next_delay == 0); | |
0a51b27e | 773 | |
42935eca | 774 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 775 | goto out; |
259b62e3 SG |
776 | |
777 | out_complete: | |
e229f844 | 778 | hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
d07bfd8b | 779 | __ieee80211_scan_completed(&local->hw, aborted, hw_scan); |
259b62e3 SG |
780 | out: |
781 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
782 | } |
783 | ||
f3b85252 JB |
784 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
785 | struct cfg80211_scan_request *req) | |
0a51b27e | 786 | { |
f3b85252 | 787 | int res; |
de95a54b | 788 | |
a1699b75 | 789 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 790 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 791 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 792 | |
f3b85252 | 793 | return res; |
0a51b27e JB |
794 | } |
795 | ||
34bcf715 SG |
796 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
797 | const u8 *ssid, u8 ssid_len, | |
798 | struct ieee80211_channel *chan) | |
0a51b27e | 799 | { |
0a51b27e | 800 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 801 | int ret = -EBUSY; |
fb63bc41 | 802 | enum ieee80211_band band; |
2a519311 | 803 | |
a1699b75 | 804 | mutex_lock(&local->mtx); |
0a51b27e | 805 | |
f3b85252 JB |
806 | /* busy scanning */ |
807 | if (local->scan_req) | |
808 | goto unlock; | |
9116dd01 | 809 | |
be4a4b6a JB |
810 | /* fill internal scan request */ |
811 | if (!chan) { | |
34bcf715 SG |
812 | int i, max_n; |
813 | int n_ch = 0; | |
be4a4b6a JB |
814 | |
815 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
816 | if (!local->hw.wiphy->bands[band]) | |
817 | continue; | |
34bcf715 SG |
818 | |
819 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
820 | for (i = 0; i < max_n; i++) { | |
821 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 822 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 SG |
823 | |
824 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IBSS | | |
825 | IEEE80211_CHAN_DISABLED)) | |
826 | continue; | |
827 | ||
828 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
829 | n_ch++; | |
be4a4b6a JB |
830 | } |
831 | } | |
832 | ||
34bcf715 SG |
833 | if (WARN_ON_ONCE(n_ch == 0)) |
834 | goto unlock; | |
835 | ||
836 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 837 | } else { |
34bcf715 SG |
838 | if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IBSS | |
839 | IEEE80211_CHAN_DISABLED))) | |
840 | goto unlock; | |
841 | ||
be4a4b6a JB |
842 | local->int_scan_req->channels[0] = chan; |
843 | local->int_scan_req->n_channels = 1; | |
844 | } | |
845 | ||
846 | local->int_scan_req->ssids = &local->scan_ssid; | |
847 | local->int_scan_req->n_ssids = 1; | |
5ba63533 JB |
848 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
849 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 850 | |
5ba63533 | 851 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 852 | unlock: |
a1699b75 | 853 | mutex_unlock(&local->mtx); |
f3b85252 | 854 | return ret; |
0a51b27e | 855 | } |
5bb644a0 | 856 | |
4136c422 SG |
857 | /* |
858 | * Only call this function when a scan can't be queued -- under RTNL. | |
859 | */ | |
5bb644a0 JB |
860 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
861 | { | |
5bb644a0 | 862 | /* |
b856439b | 863 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
864 | * yet really started (see __ieee80211_start_scan ). |
865 | * | |
866 | * Regarding hardware scan: | |
867 | * - we can not call __ieee80211_scan_completed() as when | |
868 | * SCAN_HW_SCANNING bit is set this function change | |
869 | * local->hw_scan_req to operate on 5G band, what race with | |
870 | * driver which can use local->hw_scan_req | |
871 | * | |
872 | * - we can not cancel scan_work since driver can schedule it | |
873 | * by ieee80211_scan_completed(..., true) to finish scan | |
874 | * | |
b856439b EP |
875 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
876 | * driver is still responsible for calling ieee80211_scan_completed() | |
877 | * after the scan was completed/aborted. | |
5bb644a0 | 878 | */ |
4136c422 | 879 | |
a1699b75 | 880 | mutex_lock(&local->mtx); |
b856439b EP |
881 | if (!local->scan_req) |
882 | goto out; | |
883 | ||
715a606d EG |
884 | /* |
885 | * We have a scan running and the driver already reported completion, | |
886 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
887 | * cancelled. | |
888 | */ | |
889 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
890 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
891 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
892 | goto out; | |
893 | } | |
894 | ||
b856439b | 895 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
715a606d EG |
896 | /* |
897 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
898 | * scan on another band. | |
899 | */ | |
900 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 901 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
902 | drv_cancel_hw_scan(local, |
903 | rcu_dereference_protected(local->scan_sdata, | |
904 | lockdep_is_held(&local->mtx))); | |
b856439b | 905 | goto out; |
4136c422 | 906 | } |
b856439b EP |
907 | |
908 | /* | |
909 | * If the work is currently running, it must be blocked on | |
910 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
911 | * simply exit once it acquires the mutex. | |
912 | */ | |
913 | cancel_delayed_work(&local->scan_work); | |
914 | /* and clean up */ | |
915 | __ieee80211_scan_completed(&local->hw, true, false); | |
916 | out: | |
d07bfd8b | 917 | mutex_unlock(&local->mtx); |
5bb644a0 | 918 | } |
79f460ca LC |
919 | |
920 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
921 | struct cfg80211_sched_scan_request *req) | |
922 | { | |
923 | struct ieee80211_local *local = sdata->local; | |
bca1e29f | 924 | struct ieee80211_sched_scan_ies sched_scan_ies = {}; |
c604b9f2 JB |
925 | int ret, i, iebufsz; |
926 | ||
927 | iebufsz = 2 + IEEE80211_MAX_SSID_LEN + | |
928 | local->scan_ies_len + req->ie_len; | |
79f460ca | 929 | |
5260a5b2 | 930 | mutex_lock(&local->mtx); |
79f460ca | 931 | |
5260a5b2 | 932 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
79f460ca LC |
933 | ret = -EBUSY; |
934 | goto out; | |
935 | } | |
936 | ||
937 | if (!local->ops->sched_scan_start) { | |
938 | ret = -ENOTSUPP; | |
939 | goto out; | |
940 | } | |
941 | ||
942 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
d811b3d5 AN |
943 | if (!local->hw.wiphy->bands[i]) |
944 | continue; | |
945 | ||
c604b9f2 | 946 | sched_scan_ies.ie[i] = kzalloc(iebufsz, GFP_KERNEL); |
30dd3edf | 947 | if (!sched_scan_ies.ie[i]) { |
79f460ca LC |
948 | ret = -ENOMEM; |
949 | goto out_free; | |
950 | } | |
951 | ||
30dd3edf JB |
952 | sched_scan_ies.len[i] = |
953 | ieee80211_build_preq_ies(local, sched_scan_ies.ie[i], | |
c604b9f2 JB |
954 | iebufsz, req->ie, req->ie_len, |
955 | i, (u32) -1, 0); | |
79f460ca LC |
956 | } |
957 | ||
30dd3edf JB |
958 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
959 | if (ret == 0) | |
5260a5b2 | 960 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
79f460ca LC |
961 | |
962 | out_free: | |
963 | while (i > 0) | |
30dd3edf | 964 | kfree(sched_scan_ies.ie[--i]); |
79f460ca | 965 | out: |
5260a5b2 | 966 | mutex_unlock(&local->mtx); |
79f460ca LC |
967 | return ret; |
968 | } | |
969 | ||
85a9994a | 970 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) |
79f460ca LC |
971 | { |
972 | struct ieee80211_local *local = sdata->local; | |
30dd3edf | 973 | int ret = 0; |
79f460ca | 974 | |
5260a5b2 | 975 | mutex_lock(&local->mtx); |
79f460ca LC |
976 | |
977 | if (!local->ops->sched_scan_stop) { | |
978 | ret = -ENOTSUPP; | |
979 | goto out; | |
980 | } | |
981 | ||
30dd3edf | 982 | if (rcu_access_pointer(local->sched_scan_sdata)) |
85a9994a | 983 | drv_sched_scan_stop(local, sdata); |
30dd3edf | 984 | |
79f460ca | 985 | out: |
5260a5b2 | 986 | mutex_unlock(&local->mtx); |
79f460ca LC |
987 | |
988 | return ret; | |
989 | } | |
990 | ||
991 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
992 | { | |
993 | struct ieee80211_local *local = hw_to_local(hw); | |
994 | ||
995 | trace_api_sched_scan_results(local); | |
996 | ||
997 | cfg80211_sched_scan_results(hw->wiphy); | |
998 | } | |
999 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1000 | ||
85a9994a LC |
1001 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1002 | { | |
1003 | struct ieee80211_local *local = | |
1004 | container_of(work, struct ieee80211_local, | |
1005 | sched_scan_stopped_work); | |
85a9994a LC |
1006 | |
1007 | mutex_lock(&local->mtx); | |
1008 | ||
5260a5b2 | 1009 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1010 | mutex_unlock(&local->mtx); |
1011 | return; | |
1012 | } | |
1013 | ||
5260a5b2 | 1014 | rcu_assign_pointer(local->sched_scan_sdata, NULL); |
85a9994a LC |
1015 | |
1016 | mutex_unlock(&local->mtx); | |
1017 | ||
1018 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
1019 | } | |
1020 | ||
79f460ca LC |
1021 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1022 | { | |
1023 | struct ieee80211_local *local = hw_to_local(hw); | |
1024 | ||
1025 | trace_api_sched_scan_stopped(local); | |
1026 | ||
85a9994a | 1027 | ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work); |
79f460ca LC |
1028 | } |
1029 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |