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) | |
96f7e739 | 30 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) |
0a51b27e | 31 | |
00d3f14c | 32 | static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) |
5484e237 | 33 | { |
0c1ad2ca | 34 | struct ieee80211_bss *bss = (void *)cbss->priv; |
5484e237 | 35 | |
5484e237 JB |
36 | kfree(bss_mesh_id(bss)); |
37 | kfree(bss_mesh_cfg(bss)); | |
5484e237 JB |
38 | } |
39 | ||
40 | void ieee80211_rx_bss_put(struct ieee80211_local *local, | |
c2b13452 | 41 | struct ieee80211_bss *bss) |
5484e237 | 42 | { |
0c1ad2ca JB |
43 | if (!bss) |
44 | return; | |
45 | cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv)); | |
5484e237 JB |
46 | } |
47 | ||
ab13315a KV |
48 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
49 | { | |
50 | u8 qos_info; | |
51 | ||
52 | if (elems->wmm_info && elems->wmm_info_len == 7 | |
53 | && elems->wmm_info[5] == 1) | |
54 | qos_info = elems->wmm_info[6]; | |
55 | else if (elems->wmm_param && elems->wmm_param_len == 24 | |
56 | && elems->wmm_param[5] == 1) | |
57 | qos_info = elems->wmm_param[6]; | |
58 | else | |
59 | /* no valid wmm information or parameter element found */ | |
60 | return false; | |
61 | ||
62 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; | |
63 | } | |
64 | ||
c2b13452 | 65 | struct ieee80211_bss * |
5484e237 JB |
66 | ieee80211_bss_info_update(struct ieee80211_local *local, |
67 | struct ieee80211_rx_status *rx_status, | |
68 | struct ieee80211_mgmt *mgmt, | |
69 | size_t len, | |
70 | struct ieee802_11_elems *elems, | |
2a519311 JB |
71 | struct ieee80211_channel *channel, |
72 | bool beacon) | |
5484e237 | 73 | { |
0c1ad2ca | 74 | struct cfg80211_bss *cbss; |
c2b13452 | 75 | struct ieee80211_bss *bss; |
f0b058b6 | 76 | int clen, srlen; |
2a519311 JB |
77 | s32 signal = 0; |
78 | ||
77965c97 | 79 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 80 | signal = rx_status->signal * 100; |
77965c97 | 81 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 82 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 83 | |
0c1ad2ca JB |
84 | cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
85 | mgmt, len, signal, GFP_ATOMIC); | |
0c1ad2ca | 86 | if (!cbss) |
00d3f14c JB |
87 | return NULL; |
88 | ||
0c1ad2ca JB |
89 | cbss->free_priv = ieee80211_rx_bss_free; |
90 | bss = (void *)cbss->priv; | |
5484e237 | 91 | |
8c358bcd JB |
92 | bss->device_ts = rx_status->device_timestamp; |
93 | ||
fcff4f10 PS |
94 | if (elems->parse_error) { |
95 | if (beacon) | |
96 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
97 | else | |
98 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
99 | } else { | |
100 | if (beacon) | |
101 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
102 | else | |
103 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
104 | } | |
105 | ||
5484e237 | 106 | /* save the ERP value so that it is available at association time */ |
fcff4f10 PS |
107 | if (elems->erp_info && elems->erp_info_len >= 1 && |
108 | (!elems->parse_error || | |
109 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 110 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 111 | bss->has_erp_value = true; |
fcff4f10 PS |
112 | if (!elems->parse_error) |
113 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
114 | } |
115 | ||
f0b058b6 | 116 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
117 | if (!elems->parse_error || |
118 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
119 | srlen = 0; | |
120 | if (elems->supp_rates) { | |
121 | clen = IEEE80211_MAX_SUPP_RATES; | |
122 | if (clen > elems->supp_rates_len) | |
123 | clen = elems->supp_rates_len; | |
124 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
125 | srlen += clen; | |
126 | } | |
127 | if (elems->ext_supp_rates) { | |
128 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
129 | if (clen > elems->ext_supp_rates_len) | |
130 | clen = elems->ext_supp_rates_len; | |
131 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
132 | clen); | |
133 | srlen += clen; | |
134 | } | |
135 | if (srlen) { | |
136 | bss->supp_rates_len = srlen; | |
137 | if (!elems->parse_error) | |
138 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
139 | } | |
5484e237 | 140 | } |
5484e237 | 141 | |
fcff4f10 PS |
142 | if (!elems->parse_error || |
143 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
144 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
145 | bss->uapsd_supported = is_uapsd_supported(elems); | |
146 | if (!elems->parse_error) | |
147 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
148 | } | |
5484e237 JB |
149 | |
150 | if (!beacon) | |
151 | bss->last_probe_resp = jiffies; | |
152 | ||
5484e237 JB |
153 | return bss; |
154 | } | |
0a51b27e | 155 | |
d48b2968 | 156 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 157 | { |
f1d58c25 | 158 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
159 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
160 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 161 | struct ieee80211_bss *bss; |
98c8fccf JB |
162 | u8 *elements; |
163 | struct ieee80211_channel *channel; | |
164 | size_t baselen; | |
d48b2968 | 165 | bool beacon; |
98c8fccf JB |
166 | struct ieee802_11_elems elems; |
167 | ||
d48b2968 JB |
168 | if (skb->len < 24 || |
169 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
170 | !ieee80211_is_beacon(mgmt->frame_control))) | |
171 | return; | |
98c8fccf | 172 | |
d48b2968 JB |
173 | sdata1 = rcu_dereference(local->scan_sdata); |
174 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 175 | |
d48b2968 JB |
176 | if (likely(!sdata1 && !sdata2)) |
177 | return; | |
98c8fccf | 178 | |
d48b2968 | 179 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
98c8fccf | 180 | /* ignore ProbeResp to foreign address */ |
d48b2968 JB |
181 | if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && |
182 | (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) | |
183 | return; | |
98c8fccf | 184 | |
98c8fccf JB |
185 | elements = mgmt->u.probe_resp.variable; |
186 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
d48b2968 | 187 | beacon = false; |
98c8fccf | 188 | } else { |
98c8fccf JB |
189 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
190 | elements = mgmt->u.beacon.variable; | |
d48b2968 | 191 | beacon = true; |
98c8fccf JB |
192 | } |
193 | ||
98c8fccf | 194 | if (baselen > skb->len) |
d48b2968 | 195 | return; |
98c8fccf JB |
196 | |
197 | ieee802_11_parse_elems(elements, skb->len - baselen, &elems); | |
198 | ||
0172bb75 | 199 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
200 | |
201 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 202 | return; |
98c8fccf | 203 | |
d48b2968 | 204 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 205 | mgmt, skb->len, &elems, |
2a519311 | 206 | channel, beacon); |
d048e503 | 207 | if (bss) |
d48b2968 | 208 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
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, | |
c604b9f2 | 238 | local->hw_scan_ies_bufsize, |
8ee31080 | 239 | req->ie, req->ie_len, band, |
85a237fe | 240 | req->rates[band], 0); |
4d36ec58 | 241 | local->hw_scan_req->ie_len = ielen; |
dcd83976 | 242 | local->hw_scan_req->no_cck = req->no_cck; |
4d36ec58 JB |
243 | |
244 | return true; | |
245 | } | |
246 | ||
d07bfd8b | 247 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, |
e229f844 | 248 | bool was_hw_scan) |
0a51b27e JB |
249 | { |
250 | struct ieee80211_local *local = hw_to_local(hw); | |
0a51b27e | 251 | |
e229f844 | 252 | lockdep_assert_held(&local->mtx); |
5bc75728 | 253 | |
6d3560d4 JB |
254 | /* |
255 | * It's ok to abort a not-yet-running scan (that | |
256 | * we have one at all will be verified by checking | |
257 | * local->scan_req next), but not to complete it | |
258 | * successfully. | |
259 | */ | |
260 | if (WARN_ON(!local->scanning && !aborted)) | |
261 | aborted = true; | |
5bc75728 | 262 | |
e229f844 | 263 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 264 | return; |
de95a54b | 265 | |
4d36ec58 | 266 | if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
267 | int rc; |
268 | ||
269 | rc = drv_hw_scan(local, | |
270 | rcu_dereference_protected(local->scan_sdata, | |
271 | lockdep_is_held(&local->mtx)), | |
272 | local->hw_scan_req); | |
273 | ||
6eb11a9a | 274 | if (rc == 0) |
d07bfd8b | 275 | return; |
4d36ec58 JB |
276 | } |
277 | ||
278 | kfree(local->hw_scan_req); | |
279 | local->hw_scan_req = NULL; | |
f3b85252 | 280 | |
5ba63533 | 281 | if (local->scan_req != local->int_scan_req) |
2a519311 JB |
282 | cfg80211_scan_done(local->scan_req, aborted); |
283 | local->scan_req = NULL; | |
3aa569c3 | 284 | rcu_assign_pointer(local->scan_sdata, NULL); |
2a519311 | 285 | |
fbe9c429 | 286 | local->scanning = 0; |
58905ca5 | 287 | local->scan_channel = NULL; |
f3b85252 | 288 | |
07ef03ee JB |
289 | /* Set power back to normal operating levels. */ |
290 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 291 | |
e229f844 SG |
292 | if (!was_hw_scan) { |
293 | ieee80211_configure_filter(local); | |
294 | drv_sw_scan_complete(local); | |
e76aadc5 | 295 | ieee80211_offchannel_return(local, true); |
e229f844 | 296 | } |
0a51b27e | 297 | |
5cff20e6 | 298 | ieee80211_recalc_idle(local); |
e229f844 | 299 | |
0a51b27e | 300 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 301 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 302 | ieee80211_mesh_notify_scan_completed(local); |
2eb278e0 | 303 | ieee80211_start_next_roc(local); |
0a51b27e | 304 | } |
8789d459 JB |
305 | |
306 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
307 | { | |
308 | struct ieee80211_local *local = hw_to_local(hw); | |
309 | ||
310 | trace_api_scan_completed(local, aborted); | |
311 | ||
312 | set_bit(SCAN_COMPLETED, &local->scanning); | |
313 | if (aborted) | |
314 | set_bit(SCAN_ABORTED, &local->scanning); | |
315 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
316 | } | |
0a51b27e JB |
317 | EXPORT_SYMBOL(ieee80211_scan_completed); |
318 | ||
f3b85252 JB |
319 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
320 | { | |
fe57d9f5 JB |
321 | /* Software scan is not supported in multi-channel cases */ |
322 | if (local->use_chanctx) | |
323 | return -EOPNOTSUPP; | |
324 | ||
f3b85252 JB |
325 | /* |
326 | * Hardware/driver doesn't support hw_scan, so use software | |
327 | * scanning instead. First send a nullfunc frame with power save | |
328 | * bit on so that AP will buffer the frames for us while we are not | |
329 | * listening, then send probe requests to each channel and wait for | |
330 | * the responses. After all channels are scanned, tune back to the | |
331 | * original channel and send a nullfunc frame with power save bit | |
332 | * off to trigger the AP to send us all the buffered frames. | |
333 | * | |
334 | * Note that while local->sw_scanning is true everything else but | |
335 | * nullfunc frames and probe requests will be dropped in | |
336 | * ieee80211_tx_h_check_assoc(). | |
337 | */ | |
24487981 | 338 | drv_sw_scan_start(local); |
f3b85252 | 339 | |
de312db3 | 340 | local->leave_oper_channel_time = jiffies; |
977923b0 | 341 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
342 | local->scan_channel_idx = 0; |
343 | ||
07ef03ee | 344 | ieee80211_offchannel_stop_vifs(local, true); |
a80f7c0b | 345 | |
3ac64bee | 346 | ieee80211_configure_filter(local); |
f3b85252 | 347 | |
59bdf3b0 BG |
348 | /* We need to set power level at maximum rate for scanning. */ |
349 | ieee80211_hw_config(local, 0); | |
350 | ||
42935eca | 351 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 352 | &local->scan_work, 0); |
f3b85252 JB |
353 | |
354 | return 0; | |
355 | } | |
356 | ||
133d40f9 SG |
357 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
358 | struct ieee80211_sub_if_data *sdata) | |
359 | { | |
2eb278e0 | 360 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
361 | return false; |
362 | ||
363 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
364 | sdata->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | | |
365 | IEEE80211_STA_CONNECTION_POLL)) | |
366 | return false; | |
367 | ||
368 | return true; | |
369 | } | |
370 | ||
371 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
372 | { | |
373 | lockdep_assert_held(&local->mtx); | |
374 | ||
375 | if (!local->scan_req || local->scanning) | |
376 | return; | |
377 | ||
e2fd5dbc JB |
378 | if (!ieee80211_can_scan(local, |
379 | rcu_dereference_protected( | |
380 | local->scan_sdata, | |
381 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
382 | return; |
383 | ||
384 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
385 | round_jiffies_relative(0)); | |
386 | } | |
f3b85252 | 387 | |
8a690674 BG |
388 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
389 | unsigned long *next_delay) | |
390 | { | |
391 | int i; | |
e2fd5dbc | 392 | struct ieee80211_sub_if_data *sdata; |
8a690674 BG |
393 | enum ieee80211_band band = local->hw.conf.channel->band; |
394 | ||
e2fd5dbc | 395 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 396 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 397 | |
8a690674 BG |
398 | for (i = 0; i < local->scan_req->n_ssids; i++) |
399 | ieee80211_send_probe_req( | |
400 | sdata, NULL, | |
401 | local->scan_req->ssids[i].ssid, | |
402 | local->scan_req->ssids[i].ssid_len, | |
403 | local->scan_req->ie, local->scan_req->ie_len, | |
404 | local->scan_req->rates[band], false, | |
fe94fe05 | 405 | local->scan_req->no_cck, |
55de908a | 406 | local->hw.conf.channel, 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) && |
55de908a | 472 | (req->channels[0] == local->_oper_channel)) { |
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; | |
550 | bool listen_int_exceeded; | |
551 | unsigned long min_beacon_int = 0; | |
142b9f50 | 552 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 553 | struct ieee80211_channel *next_chan; |
cd2bb512 | 554 | enum mac80211_scan_state next_scan_state; |
142b9f50 | 555 | |
df13cce5 HS |
556 | /* |
557 | * check if at least one STA interface is associated, | |
558 | * check if at least one STA interface has pending tx frames | |
559 | * and grab the lowest used beacon interval | |
560 | */ | |
142b9f50 HS |
561 | mutex_lock(&local->iflist_mtx); |
562 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 563 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
564 | continue; |
565 | ||
566 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
567 | if (sdata->u.mgd.associated) { | |
568 | associated = true; | |
df13cce5 HS |
569 | |
570 | if (sdata->vif.bss_conf.beacon_int < | |
571 | min_beacon_int || min_beacon_int == 0) | |
572 | min_beacon_int = | |
573 | sdata->vif.bss_conf.beacon_int; | |
574 | ||
575 | if (!qdisc_all_tx_empty(sdata->dev)) { | |
576 | tx_empty = false; | |
577 | break; | |
578 | } | |
142b9f50 HS |
579 | } |
580 | } | |
581 | } | |
582 | mutex_unlock(&local->iflist_mtx); | |
583 | ||
b23b025f BG |
584 | next_chan = local->scan_req->channels[local->scan_channel_idx]; |
585 | ||
a80f7c0b | 586 | /* |
07ef03ee JB |
587 | * we're currently scanning a different channel, let's |
588 | * see if we can scan another channel without interfering | |
589 | * with the current traffic situation. | |
590 | * | |
591 | * Since we don't know if the AP has pending frames for us | |
592 | * we can only check for our tx queues and use the current | |
593 | * pm_qos requirements for rx. Hence, if no tx traffic occurs | |
594 | * at all we will scan as many channels in a row as the pm_qos | |
595 | * latency allows us to. Additionally we also check for the | |
596 | * currently negotiated listen interval to prevent losing | |
597 | * frames unnecessarily. | |
598 | * | |
599 | * Otherwise switch back to the operating channel. | |
a80f7c0b | 600 | */ |
a80f7c0b | 601 | |
07ef03ee JB |
602 | bad_latency = time_after(jiffies + |
603 | ieee80211_scan_get_channel_time(next_chan), | |
604 | local->leave_oper_channel_time + | |
605 | usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY))); | |
df13cce5 | 606 | |
07ef03ee JB |
607 | listen_int_exceeded = time_after(jiffies + |
608 | ieee80211_scan_get_channel_time(next_chan), | |
609 | local->leave_oper_channel_time + | |
610 | usecs_to_jiffies(min_beacon_int * 1024) * | |
611 | local->hw.conf.listen_interval); | |
142b9f50 | 612 | |
cd2bb512 SL |
613 | if (associated && !tx_empty) { |
614 | if (local->scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) | |
615 | next_scan_state = SCAN_ABORT; | |
616 | else | |
617 | next_scan_state = SCAN_SUSPEND; | |
618 | } else if (associated && (bad_latency || listen_int_exceeded)) { | |
619 | next_scan_state = SCAN_SUSPEND; | |
620 | } else { | |
621 | next_scan_state = SCAN_SET_CHANNEL; | |
622 | } | |
623 | ||
624 | local->next_scan_state = next_scan_state; | |
142b9f50 | 625 | |
07ef03ee | 626 | *next_delay = 0; |
142b9f50 HS |
627 | } |
628 | ||
2fb3f028 HS |
629 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
630 | unsigned long *next_delay) | |
631 | { | |
632 | int skip; | |
633 | struct ieee80211_channel *chan; | |
2fb3f028 | 634 | |
7d3be3cc HS |
635 | skip = 0; |
636 | chan = local->scan_req->channels[local->scan_channel_idx]; | |
637 | ||
584991dc | 638 | local->scan_channel = chan; |
b23b025f | 639 | |
07ef03ee JB |
640 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
641 | skip = 1; | |
7d3be3cc | 642 | |
7d3be3cc HS |
643 | /* advance state machine to next channel/band */ |
644 | local->scan_channel_idx++; | |
645 | ||
0ee9c13c HS |
646 | if (skip) { |
647 | /* if we skip this channel return to the decision state */ | |
648 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 649 | return; |
0ee9c13c | 650 | } |
7d3be3cc HS |
651 | |
652 | /* | |
653 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
654 | * (which unfortunately doesn't say _why_ step a) is done, | |
655 | * but it waits for the probe delay or until a frame is | |
656 | * received - and the received frame would update the NAV). | |
657 | * For now, we do not support waiting until a frame is | |
658 | * received. | |
659 | * | |
660 | * In any case, it is not necessary for a passive scan. | |
661 | */ | |
662 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || | |
663 | !local->scan_req->n_ssids) { | |
664 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
977923b0 | 665 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 666 | return; |
7d3be3cc HS |
667 | } |
668 | ||
2fb3f028 | 669 | /* active scan, send probes */ |
7d3be3cc | 670 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 671 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
672 | } |
673 | ||
07ef03ee JB |
674 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
675 | unsigned long *next_delay) | |
676 | { | |
677 | /* switch back to the operating channel */ | |
678 | local->scan_channel = NULL; | |
679 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
680 | ||
681 | /* | |
682 | * Re-enable vifs and beaconing. Leave PS | |
683 | * in off-channel state..will put that back | |
684 | * on-channel at the end of scanning. | |
685 | */ | |
e76aadc5 | 686 | ieee80211_offchannel_return(local, false); |
07ef03ee JB |
687 | |
688 | *next_delay = HZ / 5; | |
689 | /* afterwards, resume scan & go to next channel */ | |
690 | local->next_scan_state = SCAN_RESUME; | |
691 | } | |
692 | ||
693 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
694 | unsigned long *next_delay) | |
695 | { | |
696 | /* PS already is in off-channel mode */ | |
697 | ieee80211_offchannel_stop_vifs(local, false); | |
698 | ||
699 | if (local->ops->flush) { | |
700 | drv_flush(local, false); | |
701 | *next_delay = 0; | |
702 | } else | |
703 | *next_delay = HZ / 10; | |
704 | ||
705 | /* remember when we left the operating channel */ | |
706 | local->leave_oper_channel_time = jiffies; | |
707 | ||
708 | /* advance to the next channel to be scanned */ | |
de2ee84d | 709 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
710 | } |
711 | ||
c2b13452 | 712 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
713 | { |
714 | struct ieee80211_local *local = | |
715 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 716 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 717 | unsigned long next_delay = 0; |
d07bfd8b | 718 | bool aborted, hw_scan; |
0a51b27e | 719 | |
259b62e3 | 720 | mutex_lock(&local->mtx); |
8789d459 | 721 | |
e2fd5dbc JB |
722 | sdata = rcu_dereference_protected(local->scan_sdata, |
723 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 724 | |
8a690674 BG |
725 | /* When scanning on-channel, the first-callback means completed. */ |
726 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
727 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
728 | goto out_complete; | |
729 | } | |
730 | ||
259b62e3 | 731 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 732 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 733 | goto out_complete; |
8789d459 JB |
734 | } |
735 | ||
259b62e3 SG |
736 | if (!sdata || !local->scan_req) |
737 | goto out; | |
f3b85252 | 738 | |
fbe9c429 | 739 | if (local->scan_req && !local->scanning) { |
f3b85252 JB |
740 | struct cfg80211_scan_request *req = local->scan_req; |
741 | int rc; | |
742 | ||
743 | local->scan_req = NULL; | |
e2fd5dbc | 744 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
745 | |
746 | rc = __ieee80211_start_scan(sdata, req); | |
259b62e3 | 747 | if (rc) { |
3aed49ef SG |
748 | /* need to complete scan in cfg80211 */ |
749 | local->scan_req = req; | |
259b62e3 SG |
750 | aborted = true; |
751 | goto out_complete; | |
752 | } else | |
753 | goto out; | |
f3b85252 JB |
754 | } |
755 | ||
5bc75728 JB |
756 | /* |
757 | * Avoid re-scheduling when the sdata is going away. | |
758 | */ | |
9607e6b6 | 759 | if (!ieee80211_sdata_running(sdata)) { |
259b62e3 SG |
760 | aborted = true; |
761 | goto out_complete; | |
f3b85252 | 762 | } |
0a51b27e | 763 | |
f502d09b HS |
764 | /* |
765 | * as long as no delay is required advance immediately | |
766 | * without scheduling a new work | |
767 | */ | |
768 | do { | |
c29acf20 RM |
769 | if (!ieee80211_sdata_running(sdata)) { |
770 | aborted = true; | |
771 | goto out_complete; | |
772 | } | |
773 | ||
977923b0 | 774 | switch (local->next_scan_state) { |
2fb3f028 | 775 | case SCAN_DECISION: |
e229f844 SG |
776 | /* if no more bands/channels left, complete scan */ |
777 | if (local->scan_channel_idx >= local->scan_req->n_channels) { | |
778 | aborted = false; | |
779 | goto out_complete; | |
780 | } | |
781 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 782 | break; |
2fb3f028 HS |
783 | case SCAN_SET_CHANNEL: |
784 | ieee80211_scan_state_set_channel(local, &next_delay); | |
785 | break; | |
f502d09b HS |
786 | case SCAN_SEND_PROBE: |
787 | ieee80211_scan_state_send_probe(local, &next_delay); | |
788 | break; | |
07ef03ee JB |
789 | case SCAN_SUSPEND: |
790 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 791 | break; |
07ef03ee JB |
792 | case SCAN_RESUME: |
793 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 794 | break; |
cd2bb512 SL |
795 | case SCAN_ABORT: |
796 | aborted = true; | |
797 | goto out_complete; | |
f502d09b HS |
798 | } |
799 | } while (next_delay == 0); | |
0a51b27e | 800 | |
42935eca | 801 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 802 | goto out; |
259b62e3 SG |
803 | |
804 | out_complete: | |
e229f844 | 805 | hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
d07bfd8b | 806 | __ieee80211_scan_completed(&local->hw, aborted, hw_scan); |
259b62e3 SG |
807 | out: |
808 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
809 | } |
810 | ||
f3b85252 JB |
811 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
812 | struct cfg80211_scan_request *req) | |
0a51b27e | 813 | { |
f3b85252 | 814 | int res; |
de95a54b | 815 | |
a1699b75 | 816 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 817 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 818 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 819 | |
f3b85252 | 820 | return res; |
0a51b27e JB |
821 | } |
822 | ||
34bcf715 SG |
823 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
824 | const u8 *ssid, u8 ssid_len, | |
825 | struct ieee80211_channel *chan) | |
0a51b27e | 826 | { |
0a51b27e | 827 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 828 | int ret = -EBUSY; |
fb63bc41 | 829 | enum ieee80211_band band; |
2a519311 | 830 | |
a1699b75 | 831 | mutex_lock(&local->mtx); |
0a51b27e | 832 | |
f3b85252 JB |
833 | /* busy scanning */ |
834 | if (local->scan_req) | |
835 | goto unlock; | |
9116dd01 | 836 | |
be4a4b6a JB |
837 | /* fill internal scan request */ |
838 | if (!chan) { | |
34bcf715 SG |
839 | int i, max_n; |
840 | int n_ch = 0; | |
be4a4b6a JB |
841 | |
842 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
843 | if (!local->hw.wiphy->bands[band]) | |
844 | continue; | |
34bcf715 SG |
845 | |
846 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
847 | for (i = 0; i < max_n; i++) { | |
848 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 849 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 SG |
850 | |
851 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IBSS | | |
852 | IEEE80211_CHAN_DISABLED)) | |
853 | continue; | |
854 | ||
855 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
856 | n_ch++; | |
be4a4b6a JB |
857 | } |
858 | } | |
859 | ||
34bcf715 SG |
860 | if (WARN_ON_ONCE(n_ch == 0)) |
861 | goto unlock; | |
862 | ||
863 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 864 | } else { |
34bcf715 SG |
865 | if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IBSS | |
866 | IEEE80211_CHAN_DISABLED))) | |
867 | goto unlock; | |
868 | ||
be4a4b6a JB |
869 | local->int_scan_req->channels[0] = chan; |
870 | local->int_scan_req->n_channels = 1; | |
871 | } | |
872 | ||
873 | local->int_scan_req->ssids = &local->scan_ssid; | |
874 | local->int_scan_req->n_ssids = 1; | |
5ba63533 JB |
875 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
876 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 877 | |
5ba63533 | 878 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 879 | unlock: |
a1699b75 | 880 | mutex_unlock(&local->mtx); |
f3b85252 | 881 | return ret; |
0a51b27e | 882 | } |
5bb644a0 | 883 | |
4136c422 SG |
884 | /* |
885 | * Only call this function when a scan can't be queued -- under RTNL. | |
886 | */ | |
5bb644a0 JB |
887 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
888 | { | |
5bb644a0 | 889 | /* |
b856439b | 890 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
891 | * yet really started (see __ieee80211_start_scan ). |
892 | * | |
893 | * Regarding hardware scan: | |
894 | * - we can not call __ieee80211_scan_completed() as when | |
895 | * SCAN_HW_SCANNING bit is set this function change | |
896 | * local->hw_scan_req to operate on 5G band, what race with | |
897 | * driver which can use local->hw_scan_req | |
898 | * | |
899 | * - we can not cancel scan_work since driver can schedule it | |
900 | * by ieee80211_scan_completed(..., true) to finish scan | |
901 | * | |
b856439b EP |
902 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
903 | * driver is still responsible for calling ieee80211_scan_completed() | |
904 | * after the scan was completed/aborted. | |
5bb644a0 | 905 | */ |
4136c422 | 906 | |
a1699b75 | 907 | mutex_lock(&local->mtx); |
b856439b EP |
908 | if (!local->scan_req) |
909 | goto out; | |
910 | ||
911 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { | |
912 | if (local->ops->cancel_hw_scan) | |
e2fd5dbc JB |
913 | drv_cancel_hw_scan(local, |
914 | rcu_dereference_protected(local->scan_sdata, | |
915 | lockdep_is_held(&local->mtx))); | |
b856439b | 916 | goto out; |
4136c422 | 917 | } |
b856439b EP |
918 | |
919 | /* | |
920 | * If the work is currently running, it must be blocked on | |
921 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
922 | * simply exit once it acquires the mutex. | |
923 | */ | |
924 | cancel_delayed_work(&local->scan_work); | |
925 | /* and clean up */ | |
926 | __ieee80211_scan_completed(&local->hw, true, false); | |
927 | out: | |
d07bfd8b | 928 | mutex_unlock(&local->mtx); |
5bb644a0 | 929 | } |
79f460ca LC |
930 | |
931 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
932 | struct cfg80211_sched_scan_request *req) | |
933 | { | |
934 | struct ieee80211_local *local = sdata->local; | |
bca1e29f | 935 | struct ieee80211_sched_scan_ies sched_scan_ies = {}; |
c604b9f2 JB |
936 | int ret, i, iebufsz; |
937 | ||
938 | iebufsz = 2 + IEEE80211_MAX_SSID_LEN + | |
939 | local->scan_ies_len + req->ie_len; | |
79f460ca | 940 | |
5260a5b2 | 941 | mutex_lock(&local->mtx); |
79f460ca | 942 | |
5260a5b2 | 943 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
79f460ca LC |
944 | ret = -EBUSY; |
945 | goto out; | |
946 | } | |
947 | ||
948 | if (!local->ops->sched_scan_start) { | |
949 | ret = -ENOTSUPP; | |
950 | goto out; | |
951 | } | |
952 | ||
953 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
d811b3d5 AN |
954 | if (!local->hw.wiphy->bands[i]) |
955 | continue; | |
956 | ||
c604b9f2 | 957 | sched_scan_ies.ie[i] = kzalloc(iebufsz, GFP_KERNEL); |
30dd3edf | 958 | if (!sched_scan_ies.ie[i]) { |
79f460ca LC |
959 | ret = -ENOMEM; |
960 | goto out_free; | |
961 | } | |
962 | ||
30dd3edf JB |
963 | sched_scan_ies.len[i] = |
964 | ieee80211_build_preq_ies(local, sched_scan_ies.ie[i], | |
c604b9f2 JB |
965 | iebufsz, req->ie, req->ie_len, |
966 | i, (u32) -1, 0); | |
79f460ca LC |
967 | } |
968 | ||
30dd3edf JB |
969 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
970 | if (ret == 0) | |
5260a5b2 | 971 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
79f460ca LC |
972 | |
973 | out_free: | |
974 | while (i > 0) | |
30dd3edf | 975 | kfree(sched_scan_ies.ie[--i]); |
79f460ca | 976 | out: |
5260a5b2 | 977 | mutex_unlock(&local->mtx); |
79f460ca LC |
978 | return ret; |
979 | } | |
980 | ||
85a9994a | 981 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) |
79f460ca LC |
982 | { |
983 | struct ieee80211_local *local = sdata->local; | |
30dd3edf | 984 | int ret = 0; |
79f460ca | 985 | |
5260a5b2 | 986 | mutex_lock(&local->mtx); |
79f460ca LC |
987 | |
988 | if (!local->ops->sched_scan_stop) { | |
989 | ret = -ENOTSUPP; | |
990 | goto out; | |
991 | } | |
992 | ||
30dd3edf | 993 | if (rcu_access_pointer(local->sched_scan_sdata)) |
85a9994a | 994 | drv_sched_scan_stop(local, sdata); |
30dd3edf | 995 | |
79f460ca | 996 | out: |
5260a5b2 | 997 | mutex_unlock(&local->mtx); |
79f460ca LC |
998 | |
999 | return ret; | |
1000 | } | |
1001 | ||
1002 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1003 | { | |
1004 | struct ieee80211_local *local = hw_to_local(hw); | |
1005 | ||
1006 | trace_api_sched_scan_results(local); | |
1007 | ||
1008 | cfg80211_sched_scan_results(hw->wiphy); | |
1009 | } | |
1010 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1011 | ||
85a9994a LC |
1012 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1013 | { | |
1014 | struct ieee80211_local *local = | |
1015 | container_of(work, struct ieee80211_local, | |
1016 | sched_scan_stopped_work); | |
85a9994a LC |
1017 | |
1018 | mutex_lock(&local->mtx); | |
1019 | ||
5260a5b2 | 1020 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1021 | mutex_unlock(&local->mtx); |
1022 | return; | |
1023 | } | |
1024 | ||
5260a5b2 | 1025 | rcu_assign_pointer(local->sched_scan_sdata, NULL); |
85a9994a LC |
1026 | |
1027 | mutex_unlock(&local->mtx); | |
1028 | ||
1029 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
1030 | } | |
1031 | ||
79f460ca LC |
1032 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1033 | { | |
1034 | struct ieee80211_local *local = hw_to_local(hw); | |
1035 | ||
1036 | trace_api_sched_scan_stopped(local); | |
1037 | ||
85a9994a | 1038 | ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work); |
79f460ca LC |
1039 | } |
1040 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |