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, | |
d45c4172 | 68 | struct ieee80211_mgmt *mgmt, size_t len, |
5484e237 | 69 | struct ieee802_11_elems *elems, |
d45c4172 | 70 | struct ieee80211_channel *channel) |
5484e237 | 71 | { |
d45c4172 | 72 | bool beacon = ieee80211_is_beacon(mgmt->frame_control); |
0c1ad2ca | 73 | struct cfg80211_bss *cbss; |
c2b13452 | 74 | struct ieee80211_bss *bss; |
f0b058b6 | 75 | int clen, srlen; |
2a519311 JB |
76 | s32 signal = 0; |
77 | ||
77965c97 | 78 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 79 | signal = rx_status->signal * 100; |
77965c97 | 80 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 81 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 82 | |
0c1ad2ca JB |
83 | cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
84 | mgmt, len, signal, GFP_ATOMIC); | |
0c1ad2ca | 85 | if (!cbss) |
00d3f14c JB |
86 | return NULL; |
87 | ||
0c1ad2ca JB |
88 | cbss->free_priv = ieee80211_rx_bss_free; |
89 | bss = (void *)cbss->priv; | |
5484e237 | 90 | |
8c358bcd JB |
91 | bss->device_ts = rx_status->device_timestamp; |
92 | ||
fcff4f10 PS |
93 | if (elems->parse_error) { |
94 | if (beacon) | |
95 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
96 | else | |
97 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
98 | } else { | |
99 | if (beacon) | |
100 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
101 | else | |
102 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
103 | } | |
104 | ||
5484e237 | 105 | /* save the ERP value so that it is available at association time */ |
fcff4f10 PS |
106 | if (elems->erp_info && elems->erp_info_len >= 1 && |
107 | (!elems->parse_error || | |
108 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 109 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 110 | bss->has_erp_value = true; |
fcff4f10 PS |
111 | if (!elems->parse_error) |
112 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
113 | } |
114 | ||
f0b058b6 | 115 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
116 | if (!elems->parse_error || |
117 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
118 | srlen = 0; | |
119 | if (elems->supp_rates) { | |
120 | clen = IEEE80211_MAX_SUPP_RATES; | |
121 | if (clen > elems->supp_rates_len) | |
122 | clen = elems->supp_rates_len; | |
123 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
124 | srlen += clen; | |
125 | } | |
126 | if (elems->ext_supp_rates) { | |
127 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
128 | if (clen > elems->ext_supp_rates_len) | |
129 | clen = elems->ext_supp_rates_len; | |
130 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
131 | clen); | |
132 | srlen += clen; | |
133 | } | |
134 | if (srlen) { | |
135 | bss->supp_rates_len = srlen; | |
136 | if (!elems->parse_error) | |
137 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
138 | } | |
5484e237 | 139 | } |
5484e237 | 140 | |
fcff4f10 PS |
141 | if (!elems->parse_error || |
142 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
143 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
144 | bss->uapsd_supported = is_uapsd_supported(elems); | |
145 | if (!elems->parse_error) | |
146 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
147 | } | |
5484e237 JB |
148 | |
149 | if (!beacon) | |
150 | bss->last_probe_resp = jiffies; | |
151 | ||
5484e237 JB |
152 | return bss; |
153 | } | |
0a51b27e | 154 | |
d48b2968 | 155 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 156 | { |
f1d58c25 | 157 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
158 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
159 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 160 | struct ieee80211_bss *bss; |
98c8fccf JB |
161 | u8 *elements; |
162 | struct ieee80211_channel *channel; | |
163 | size_t baselen; | |
d48b2968 | 164 | bool beacon; |
98c8fccf JB |
165 | struct ieee802_11_elems elems; |
166 | ||
d48b2968 JB |
167 | if (skb->len < 24 || |
168 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
169 | !ieee80211_is_beacon(mgmt->frame_control))) | |
170 | return; | |
98c8fccf | 171 | |
d48b2968 JB |
172 | sdata1 = rcu_dereference(local->scan_sdata); |
173 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 174 | |
d48b2968 JB |
175 | if (likely(!sdata1 && !sdata2)) |
176 | return; | |
98c8fccf | 177 | |
d48b2968 | 178 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
98c8fccf | 179 | /* ignore ProbeResp to foreign address */ |
d48b2968 JB |
180 | if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && |
181 | (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) | |
182 | return; | |
98c8fccf | 183 | |
98c8fccf JB |
184 | elements = mgmt->u.probe_resp.variable; |
185 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
d48b2968 | 186 | beacon = false; |
98c8fccf | 187 | } else { |
98c8fccf JB |
188 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
189 | elements = mgmt->u.beacon.variable; | |
d48b2968 | 190 | beacon = true; |
98c8fccf JB |
191 | } |
192 | ||
98c8fccf | 193 | if (baselen > skb->len) |
d48b2968 | 194 | return; |
98c8fccf JB |
195 | |
196 | ieee802_11_parse_elems(elements, skb->len - baselen, &elems); | |
197 | ||
0172bb75 | 198 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
199 | |
200 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 201 | return; |
98c8fccf | 202 | |
d48b2968 | 203 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 204 | mgmt, skb->len, &elems, |
d45c4172 | 205 | channel); |
d048e503 | 206 | if (bss) |
d48b2968 | 207 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
208 | } |
209 | ||
4d36ec58 JB |
210 | /* return false if no more work */ |
211 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
212 | { | |
213 | struct cfg80211_scan_request *req = local->scan_req; | |
214 | enum ieee80211_band band; | |
215 | int i, ielen, n_chans; | |
216 | ||
217 | do { | |
218 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
219 | return false; | |
220 | ||
221 | band = local->hw_scan_band; | |
222 | n_chans = 0; | |
223 | for (i = 0; i < req->n_channels; i++) { | |
224 | if (req->channels[i]->band == band) { | |
225 | local->hw_scan_req->channels[n_chans] = | |
226 | req->channels[i]; | |
227 | n_chans++; | |
228 | } | |
229 | } | |
230 | ||
231 | local->hw_scan_band++; | |
232 | } while (!n_chans); | |
233 | ||
234 | local->hw_scan_req->n_channels = n_chans; | |
235 | ||
236 | ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, | |
c604b9f2 | 237 | local->hw_scan_ies_bufsize, |
8ee31080 | 238 | req->ie, req->ie_len, band, |
85a237fe | 239 | req->rates[band], 0); |
4d36ec58 | 240 | local->hw_scan_req->ie_len = ielen; |
dcd83976 | 241 | local->hw_scan_req->no_cck = req->no_cck; |
4d36ec58 JB |
242 | |
243 | return true; | |
244 | } | |
245 | ||
d07bfd8b | 246 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, |
e229f844 | 247 | bool was_hw_scan) |
0a51b27e JB |
248 | { |
249 | struct ieee80211_local *local = hw_to_local(hw); | |
0a51b27e | 250 | |
e229f844 | 251 | lockdep_assert_held(&local->mtx); |
5bc75728 | 252 | |
6d3560d4 JB |
253 | /* |
254 | * It's ok to abort a not-yet-running scan (that | |
255 | * we have one at all will be verified by checking | |
256 | * local->scan_req next), but not to complete it | |
257 | * successfully. | |
258 | */ | |
259 | if (WARN_ON(!local->scanning && !aborted)) | |
260 | aborted = true; | |
5bc75728 | 261 | |
e229f844 | 262 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 263 | return; |
de95a54b | 264 | |
4d36ec58 | 265 | if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
266 | int rc; |
267 | ||
268 | rc = drv_hw_scan(local, | |
269 | rcu_dereference_protected(local->scan_sdata, | |
270 | lockdep_is_held(&local->mtx)), | |
271 | local->hw_scan_req); | |
272 | ||
6eb11a9a | 273 | if (rc == 0) |
d07bfd8b | 274 | return; |
4d36ec58 JB |
275 | } |
276 | ||
277 | kfree(local->hw_scan_req); | |
278 | local->hw_scan_req = NULL; | |
f3b85252 | 279 | |
5ba63533 | 280 | if (local->scan_req != local->int_scan_req) |
2a519311 JB |
281 | cfg80211_scan_done(local->scan_req, aborted); |
282 | local->scan_req = NULL; | |
3aa569c3 | 283 | rcu_assign_pointer(local->scan_sdata, NULL); |
2a519311 | 284 | |
fbe9c429 | 285 | local->scanning = 0; |
58905ca5 | 286 | local->scan_channel = NULL; |
f3b85252 | 287 | |
07ef03ee JB |
288 | /* Set power back to normal operating levels. */ |
289 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 290 | |
e229f844 SG |
291 | if (!was_hw_scan) { |
292 | ieee80211_configure_filter(local); | |
293 | drv_sw_scan_complete(local); | |
e76aadc5 | 294 | ieee80211_offchannel_return(local, true); |
e229f844 | 295 | } |
0a51b27e | 296 | |
5cff20e6 | 297 | ieee80211_recalc_idle(local); |
e229f844 | 298 | |
0a51b27e | 299 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 300 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 301 | ieee80211_mesh_notify_scan_completed(local); |
2eb278e0 | 302 | ieee80211_start_next_roc(local); |
0a51b27e | 303 | } |
8789d459 JB |
304 | |
305 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
306 | { | |
307 | struct ieee80211_local *local = hw_to_local(hw); | |
308 | ||
309 | trace_api_scan_completed(local, aborted); | |
310 | ||
311 | set_bit(SCAN_COMPLETED, &local->scanning); | |
312 | if (aborted) | |
313 | set_bit(SCAN_ABORTED, &local->scanning); | |
314 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
315 | } | |
0a51b27e JB |
316 | EXPORT_SYMBOL(ieee80211_scan_completed); |
317 | ||
f3b85252 JB |
318 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
319 | { | |
fe57d9f5 JB |
320 | /* Software scan is not supported in multi-channel cases */ |
321 | if (local->use_chanctx) | |
322 | return -EOPNOTSUPP; | |
323 | ||
f3b85252 JB |
324 | /* |
325 | * Hardware/driver doesn't support hw_scan, so use software | |
326 | * scanning instead. First send a nullfunc frame with power save | |
327 | * bit on so that AP will buffer the frames for us while we are not | |
328 | * listening, then send probe requests to each channel and wait for | |
329 | * the responses. After all channels are scanned, tune back to the | |
330 | * original channel and send a nullfunc frame with power save bit | |
331 | * off to trigger the AP to send us all the buffered frames. | |
332 | * | |
333 | * Note that while local->sw_scanning is true everything else but | |
334 | * nullfunc frames and probe requests will be dropped in | |
335 | * ieee80211_tx_h_check_assoc(). | |
336 | */ | |
24487981 | 337 | drv_sw_scan_start(local); |
f3b85252 | 338 | |
de312db3 | 339 | local->leave_oper_channel_time = jiffies; |
977923b0 | 340 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
341 | local->scan_channel_idx = 0; |
342 | ||
07ef03ee | 343 | ieee80211_offchannel_stop_vifs(local, true); |
a80f7c0b | 344 | |
3ac64bee | 345 | ieee80211_configure_filter(local); |
f3b85252 | 346 | |
59bdf3b0 BG |
347 | /* We need to set power level at maximum rate for scanning. */ |
348 | ieee80211_hw_config(local, 0); | |
349 | ||
42935eca | 350 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 351 | &local->scan_work, 0); |
f3b85252 JB |
352 | |
353 | return 0; | |
354 | } | |
355 | ||
133d40f9 SG |
356 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
357 | struct ieee80211_sub_if_data *sdata) | |
358 | { | |
2eb278e0 | 359 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
360 | return false; |
361 | ||
362 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
363 | sdata->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | | |
364 | IEEE80211_STA_CONNECTION_POLL)) | |
365 | return false; | |
366 | ||
367 | return true; | |
368 | } | |
369 | ||
370 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
371 | { | |
372 | lockdep_assert_held(&local->mtx); | |
373 | ||
374 | if (!local->scan_req || local->scanning) | |
375 | return; | |
376 | ||
e2fd5dbc JB |
377 | if (!ieee80211_can_scan(local, |
378 | rcu_dereference_protected( | |
379 | local->scan_sdata, | |
380 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
381 | return; |
382 | ||
383 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
384 | round_jiffies_relative(0)); | |
385 | } | |
f3b85252 | 386 | |
8a690674 BG |
387 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
388 | unsigned long *next_delay) | |
389 | { | |
390 | int i; | |
e2fd5dbc | 391 | struct ieee80211_sub_if_data *sdata; |
8a690674 BG |
392 | enum ieee80211_band band = local->hw.conf.channel->band; |
393 | ||
e2fd5dbc | 394 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 395 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 396 | |
8a690674 BG |
397 | for (i = 0; i < local->scan_req->n_ssids; i++) |
398 | ieee80211_send_probe_req( | |
399 | sdata, NULL, | |
400 | local->scan_req->ssids[i].ssid, | |
401 | local->scan_req->ssids[i].ssid_len, | |
402 | local->scan_req->ie, local->scan_req->ie_len, | |
403 | local->scan_req->rates[band], false, | |
fe94fe05 | 404 | local->scan_req->no_cck, |
55de908a | 405 | local->hw.conf.channel, true); |
8a690674 BG |
406 | |
407 | /* | |
408 | * After sending probe requests, wait for probe responses | |
409 | * on the channel. | |
410 | */ | |
411 | *next_delay = IEEE80211_CHANNEL_TIME; | |
412 | local->next_scan_state = SCAN_DECISION; | |
413 | } | |
414 | ||
f3b85252 JB |
415 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
416 | struct cfg80211_scan_request *req) | |
417 | { | |
418 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
419 | int rc; |
420 | ||
e229f844 SG |
421 | lockdep_assert_held(&local->mtx); |
422 | ||
f3b85252 JB |
423 | if (local->scan_req) |
424 | return -EBUSY; | |
425 | ||
133d40f9 | 426 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 427 | /* wait for the work to finish/time out */ |
c0ce77b8 | 428 | local->scan_req = req; |
e2fd5dbc | 429 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
430 | return 0; |
431 | } | |
432 | ||
f3b85252 JB |
433 | if (local->ops->hw_scan) { |
434 | u8 *ies; | |
f3b85252 | 435 | |
c604b9f2 JB |
436 | local->hw_scan_ies_bufsize = 2 + IEEE80211_MAX_SSID_LEN + |
437 | local->scan_ies_len + | |
438 | req->ie_len; | |
4d36ec58 JB |
439 | local->hw_scan_req = kmalloc( |
440 | sizeof(*local->hw_scan_req) + | |
441 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 442 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 443 | if (!local->hw_scan_req) |
f3b85252 JB |
444 | return -ENOMEM; |
445 | ||
4d36ec58 JB |
446 | local->hw_scan_req->ssids = req->ssids; |
447 | local->hw_scan_req->n_ssids = req->n_ssids; | |
448 | ies = (u8 *)local->hw_scan_req + | |
449 | sizeof(*local->hw_scan_req) + | |
450 | req->n_channels * sizeof(req->channels[0]); | |
451 | local->hw_scan_req->ie = ies; | |
cd2bb512 | 452 | local->hw_scan_req->flags = req->flags; |
4d36ec58 JB |
453 | |
454 | local->hw_scan_band = 0; | |
6e7e6213 JL |
455 | |
456 | /* | |
457 | * After allocating local->hw_scan_req, we must | |
458 | * go through until ieee80211_prep_hw_scan(), so | |
459 | * anything that might be changed here and leave | |
460 | * this function early must not go after this | |
461 | * allocation. | |
462 | */ | |
f3b85252 JB |
463 | } |
464 | ||
465 | local->scan_req = req; | |
e2fd5dbc | 466 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 467 | |
8a690674 | 468 | if (local->ops->hw_scan) { |
fbe9c429 | 469 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 470 | } else if ((req->n_channels == 1) && |
55de908a | 471 | (req->channels[0] == local->_oper_channel)) { |
9b864870 JB |
472 | /* |
473 | * If we are scanning only on the operating channel | |
474 | * then we do not need to stop normal activities | |
8a690674 BG |
475 | */ |
476 | unsigned long next_delay; | |
477 | ||
478 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
479 | ||
480 | ieee80211_recalc_idle(local); | |
481 | ||
482 | /* Notify driver scan is starting, keep order of operations | |
483 | * same as normal software scan, in case that matters. */ | |
484 | drv_sw_scan_start(local); | |
485 | ||
486 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
487 | ||
488 | /* We need to ensure power level is at max for scanning. */ | |
489 | ieee80211_hw_config(local, 0); | |
490 | ||
491 | if ((req->channels[0]->flags & | |
492 | IEEE80211_CHAN_PASSIVE_SCAN) || | |
493 | !local->scan_req->n_ssids) { | |
494 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
495 | } else { | |
496 | ieee80211_scan_state_send_probe(local, &next_delay); | |
497 | next_delay = IEEE80211_CHANNEL_TIME; | |
498 | } | |
499 | ||
500 | /* Now, just wait a bit and we are all done! */ | |
501 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
502 | next_delay); | |
503 | return 0; | |
504 | } else { | |
505 | /* Do normal software scan */ | |
fbe9c429 | 506 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 507 | } |
6e7e6213 | 508 | |
5cff20e6 | 509 | ieee80211_recalc_idle(local); |
f3b85252 | 510 | |
4d36ec58 JB |
511 | if (local->ops->hw_scan) { |
512 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 513 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
4d36ec58 | 514 | } else |
f3b85252 JB |
515 | rc = ieee80211_start_sw_scan(local); |
516 | ||
f3b85252 | 517 | if (rc) { |
4d36ec58 JB |
518 | kfree(local->hw_scan_req); |
519 | local->hw_scan_req = NULL; | |
fbe9c429 | 520 | local->scanning = 0; |
f3b85252 | 521 | |
5cff20e6 JB |
522 | ieee80211_recalc_idle(local); |
523 | ||
f3b85252 | 524 | local->scan_req = NULL; |
e2fd5dbc | 525 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
526 | } |
527 | ||
528 | return rc; | |
529 | } | |
530 | ||
df13cce5 HS |
531 | static unsigned long |
532 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
533 | { | |
534 | /* | |
535 | * TODO: channel switching also consumes quite some time, | |
536 | * add that delay as well to get a better estimation | |
537 | */ | |
538 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) | |
539 | return IEEE80211_PASSIVE_CHANNEL_TIME; | |
540 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
541 | } | |
542 | ||
e229f844 SG |
543 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
544 | unsigned long *next_delay) | |
7d3be3cc | 545 | { |
142b9f50 | 546 | bool associated = false; |
df13cce5 HS |
547 | bool tx_empty = true; |
548 | bool bad_latency; | |
549 | bool listen_int_exceeded; | |
550 | unsigned long min_beacon_int = 0; | |
142b9f50 | 551 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 552 | struct ieee80211_channel *next_chan; |
cd2bb512 | 553 | enum mac80211_scan_state next_scan_state; |
142b9f50 | 554 | |
df13cce5 HS |
555 | /* |
556 | * check if at least one STA interface is associated, | |
557 | * check if at least one STA interface has pending tx frames | |
558 | * and grab the lowest used beacon interval | |
559 | */ | |
142b9f50 HS |
560 | mutex_lock(&local->iflist_mtx); |
561 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 562 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
563 | continue; |
564 | ||
565 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
566 | if (sdata->u.mgd.associated) { | |
567 | associated = true; | |
df13cce5 HS |
568 | |
569 | if (sdata->vif.bss_conf.beacon_int < | |
570 | min_beacon_int || min_beacon_int == 0) | |
571 | min_beacon_int = | |
572 | sdata->vif.bss_conf.beacon_int; | |
573 | ||
574 | if (!qdisc_all_tx_empty(sdata->dev)) { | |
575 | tx_empty = false; | |
576 | break; | |
577 | } | |
142b9f50 HS |
578 | } |
579 | } | |
580 | } | |
581 | mutex_unlock(&local->iflist_mtx); | |
582 | ||
b23b025f BG |
583 | next_chan = local->scan_req->channels[local->scan_channel_idx]; |
584 | ||
a80f7c0b | 585 | /* |
07ef03ee JB |
586 | * we're currently scanning a different channel, let's |
587 | * see if we can scan another channel without interfering | |
588 | * with the current traffic situation. | |
589 | * | |
590 | * Since we don't know if the AP has pending frames for us | |
591 | * we can only check for our tx queues and use the current | |
592 | * pm_qos requirements for rx. Hence, if no tx traffic occurs | |
593 | * at all we will scan as many channels in a row as the pm_qos | |
594 | * latency allows us to. Additionally we also check for the | |
595 | * currently negotiated listen interval to prevent losing | |
596 | * frames unnecessarily. | |
597 | * | |
598 | * Otherwise switch back to the operating channel. | |
a80f7c0b | 599 | */ |
a80f7c0b | 600 | |
07ef03ee JB |
601 | bad_latency = time_after(jiffies + |
602 | ieee80211_scan_get_channel_time(next_chan), | |
603 | local->leave_oper_channel_time + | |
604 | usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY))); | |
df13cce5 | 605 | |
07ef03ee JB |
606 | listen_int_exceeded = time_after(jiffies + |
607 | ieee80211_scan_get_channel_time(next_chan), | |
608 | local->leave_oper_channel_time + | |
609 | usecs_to_jiffies(min_beacon_int * 1024) * | |
610 | local->hw.conf.listen_interval); | |
142b9f50 | 611 | |
cd2bb512 SL |
612 | if (associated && !tx_empty) { |
613 | if (local->scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) | |
614 | next_scan_state = SCAN_ABORT; | |
615 | else | |
616 | next_scan_state = SCAN_SUSPEND; | |
617 | } else if (associated && (bad_latency || listen_int_exceeded)) { | |
618 | next_scan_state = SCAN_SUSPEND; | |
619 | } else { | |
620 | next_scan_state = SCAN_SET_CHANNEL; | |
621 | } | |
622 | ||
623 | local->next_scan_state = next_scan_state; | |
142b9f50 | 624 | |
07ef03ee | 625 | *next_delay = 0; |
142b9f50 HS |
626 | } |
627 | ||
2fb3f028 HS |
628 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
629 | unsigned long *next_delay) | |
630 | { | |
631 | int skip; | |
632 | struct ieee80211_channel *chan; | |
2fb3f028 | 633 | |
7d3be3cc HS |
634 | skip = 0; |
635 | chan = local->scan_req->channels[local->scan_channel_idx]; | |
636 | ||
584991dc | 637 | local->scan_channel = chan; |
b23b025f | 638 | |
07ef03ee JB |
639 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
640 | skip = 1; | |
7d3be3cc | 641 | |
7d3be3cc HS |
642 | /* advance state machine to next channel/band */ |
643 | local->scan_channel_idx++; | |
644 | ||
0ee9c13c HS |
645 | if (skip) { |
646 | /* if we skip this channel return to the decision state */ | |
647 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 648 | return; |
0ee9c13c | 649 | } |
7d3be3cc HS |
650 | |
651 | /* | |
652 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
653 | * (which unfortunately doesn't say _why_ step a) is done, | |
654 | * but it waits for the probe delay or until a frame is | |
655 | * received - and the received frame would update the NAV). | |
656 | * For now, we do not support waiting until a frame is | |
657 | * received. | |
658 | * | |
659 | * In any case, it is not necessary for a passive scan. | |
660 | */ | |
661 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || | |
662 | !local->scan_req->n_ssids) { | |
663 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
977923b0 | 664 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 665 | return; |
7d3be3cc HS |
666 | } |
667 | ||
2fb3f028 | 668 | /* active scan, send probes */ |
7d3be3cc | 669 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 670 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
671 | } |
672 | ||
07ef03ee JB |
673 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
674 | unsigned long *next_delay) | |
675 | { | |
676 | /* switch back to the operating channel */ | |
677 | local->scan_channel = NULL; | |
678 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
679 | ||
680 | /* | |
681 | * Re-enable vifs and beaconing. Leave PS | |
682 | * in off-channel state..will put that back | |
683 | * on-channel at the end of scanning. | |
684 | */ | |
e76aadc5 | 685 | ieee80211_offchannel_return(local, false); |
07ef03ee JB |
686 | |
687 | *next_delay = HZ / 5; | |
688 | /* afterwards, resume scan & go to next channel */ | |
689 | local->next_scan_state = SCAN_RESUME; | |
690 | } | |
691 | ||
692 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
693 | unsigned long *next_delay) | |
694 | { | |
695 | /* PS already is in off-channel mode */ | |
696 | ieee80211_offchannel_stop_vifs(local, false); | |
697 | ||
698 | if (local->ops->flush) { | |
699 | drv_flush(local, false); | |
700 | *next_delay = 0; | |
701 | } else | |
702 | *next_delay = HZ / 10; | |
703 | ||
704 | /* remember when we left the operating channel */ | |
705 | local->leave_oper_channel_time = jiffies; | |
706 | ||
707 | /* advance to the next channel to be scanned */ | |
de2ee84d | 708 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
709 | } |
710 | ||
c2b13452 | 711 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
712 | { |
713 | struct ieee80211_local *local = | |
714 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 715 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 716 | unsigned long next_delay = 0; |
d07bfd8b | 717 | bool aborted, hw_scan; |
0a51b27e | 718 | |
259b62e3 | 719 | mutex_lock(&local->mtx); |
8789d459 | 720 | |
e2fd5dbc JB |
721 | sdata = rcu_dereference_protected(local->scan_sdata, |
722 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 723 | |
8a690674 BG |
724 | /* When scanning on-channel, the first-callback means completed. */ |
725 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
726 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
727 | goto out_complete; | |
728 | } | |
729 | ||
259b62e3 | 730 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 731 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 732 | goto out_complete; |
8789d459 JB |
733 | } |
734 | ||
259b62e3 SG |
735 | if (!sdata || !local->scan_req) |
736 | goto out; | |
f3b85252 | 737 | |
fbe9c429 | 738 | if (local->scan_req && !local->scanning) { |
f3b85252 JB |
739 | struct cfg80211_scan_request *req = local->scan_req; |
740 | int rc; | |
741 | ||
742 | local->scan_req = NULL; | |
e2fd5dbc | 743 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
744 | |
745 | rc = __ieee80211_start_scan(sdata, req); | |
259b62e3 | 746 | if (rc) { |
3aed49ef SG |
747 | /* need to complete scan in cfg80211 */ |
748 | local->scan_req = req; | |
259b62e3 SG |
749 | aborted = true; |
750 | goto out_complete; | |
751 | } else | |
752 | goto out; | |
f3b85252 JB |
753 | } |
754 | ||
5bc75728 JB |
755 | /* |
756 | * Avoid re-scheduling when the sdata is going away. | |
757 | */ | |
9607e6b6 | 758 | if (!ieee80211_sdata_running(sdata)) { |
259b62e3 SG |
759 | aborted = true; |
760 | goto out_complete; | |
f3b85252 | 761 | } |
0a51b27e | 762 | |
f502d09b HS |
763 | /* |
764 | * as long as no delay is required advance immediately | |
765 | * without scheduling a new work | |
766 | */ | |
767 | do { | |
c29acf20 RM |
768 | if (!ieee80211_sdata_running(sdata)) { |
769 | aborted = true; | |
770 | goto out_complete; | |
771 | } | |
772 | ||
977923b0 | 773 | switch (local->next_scan_state) { |
2fb3f028 | 774 | case SCAN_DECISION: |
e229f844 SG |
775 | /* if no more bands/channels left, complete scan */ |
776 | if (local->scan_channel_idx >= local->scan_req->n_channels) { | |
777 | aborted = false; | |
778 | goto out_complete; | |
779 | } | |
780 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 781 | break; |
2fb3f028 HS |
782 | case SCAN_SET_CHANNEL: |
783 | ieee80211_scan_state_set_channel(local, &next_delay); | |
784 | break; | |
f502d09b HS |
785 | case SCAN_SEND_PROBE: |
786 | ieee80211_scan_state_send_probe(local, &next_delay); | |
787 | break; | |
07ef03ee JB |
788 | case SCAN_SUSPEND: |
789 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 790 | break; |
07ef03ee JB |
791 | case SCAN_RESUME: |
792 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 793 | break; |
cd2bb512 SL |
794 | case SCAN_ABORT: |
795 | aborted = true; | |
796 | goto out_complete; | |
f502d09b HS |
797 | } |
798 | } while (next_delay == 0); | |
0a51b27e | 799 | |
42935eca | 800 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 801 | goto out; |
259b62e3 SG |
802 | |
803 | out_complete: | |
e229f844 | 804 | hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
d07bfd8b | 805 | __ieee80211_scan_completed(&local->hw, aborted, hw_scan); |
259b62e3 SG |
806 | out: |
807 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
808 | } |
809 | ||
f3b85252 JB |
810 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
811 | struct cfg80211_scan_request *req) | |
0a51b27e | 812 | { |
f3b85252 | 813 | int res; |
de95a54b | 814 | |
a1699b75 | 815 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 816 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 817 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 818 | |
f3b85252 | 819 | return res; |
0a51b27e JB |
820 | } |
821 | ||
34bcf715 SG |
822 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
823 | const u8 *ssid, u8 ssid_len, | |
824 | struct ieee80211_channel *chan) | |
0a51b27e | 825 | { |
0a51b27e | 826 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 827 | int ret = -EBUSY; |
fb63bc41 | 828 | enum ieee80211_band band; |
2a519311 | 829 | |
a1699b75 | 830 | mutex_lock(&local->mtx); |
0a51b27e | 831 | |
f3b85252 JB |
832 | /* busy scanning */ |
833 | if (local->scan_req) | |
834 | goto unlock; | |
9116dd01 | 835 | |
be4a4b6a JB |
836 | /* fill internal scan request */ |
837 | if (!chan) { | |
34bcf715 SG |
838 | int i, max_n; |
839 | int n_ch = 0; | |
be4a4b6a JB |
840 | |
841 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
842 | if (!local->hw.wiphy->bands[band]) | |
843 | continue; | |
34bcf715 SG |
844 | |
845 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
846 | for (i = 0; i < max_n; i++) { | |
847 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 848 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 SG |
849 | |
850 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IBSS | | |
851 | IEEE80211_CHAN_DISABLED)) | |
852 | continue; | |
853 | ||
854 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
855 | n_ch++; | |
be4a4b6a JB |
856 | } |
857 | } | |
858 | ||
34bcf715 SG |
859 | if (WARN_ON_ONCE(n_ch == 0)) |
860 | goto unlock; | |
861 | ||
862 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 863 | } else { |
34bcf715 SG |
864 | if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IBSS | |
865 | IEEE80211_CHAN_DISABLED))) | |
866 | goto unlock; | |
867 | ||
be4a4b6a JB |
868 | local->int_scan_req->channels[0] = chan; |
869 | local->int_scan_req->n_channels = 1; | |
870 | } | |
871 | ||
872 | local->int_scan_req->ssids = &local->scan_ssid; | |
873 | local->int_scan_req->n_ssids = 1; | |
5ba63533 JB |
874 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
875 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 876 | |
5ba63533 | 877 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 878 | unlock: |
a1699b75 | 879 | mutex_unlock(&local->mtx); |
f3b85252 | 880 | return ret; |
0a51b27e | 881 | } |
5bb644a0 | 882 | |
4136c422 SG |
883 | /* |
884 | * Only call this function when a scan can't be queued -- under RTNL. | |
885 | */ | |
5bb644a0 JB |
886 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
887 | { | |
5bb644a0 | 888 | /* |
b856439b | 889 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
890 | * yet really started (see __ieee80211_start_scan ). |
891 | * | |
892 | * Regarding hardware scan: | |
893 | * - we can not call __ieee80211_scan_completed() as when | |
894 | * SCAN_HW_SCANNING bit is set this function change | |
895 | * local->hw_scan_req to operate on 5G band, what race with | |
896 | * driver which can use local->hw_scan_req | |
897 | * | |
898 | * - we can not cancel scan_work since driver can schedule it | |
899 | * by ieee80211_scan_completed(..., true) to finish scan | |
900 | * | |
b856439b EP |
901 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
902 | * driver is still responsible for calling ieee80211_scan_completed() | |
903 | * after the scan was completed/aborted. | |
5bb644a0 | 904 | */ |
4136c422 | 905 | |
a1699b75 | 906 | mutex_lock(&local->mtx); |
b856439b EP |
907 | if (!local->scan_req) |
908 | goto out; | |
909 | ||
910 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { | |
911 | if (local->ops->cancel_hw_scan) | |
e2fd5dbc JB |
912 | drv_cancel_hw_scan(local, |
913 | rcu_dereference_protected(local->scan_sdata, | |
914 | lockdep_is_held(&local->mtx))); | |
b856439b | 915 | goto out; |
4136c422 | 916 | } |
b856439b EP |
917 | |
918 | /* | |
919 | * If the work is currently running, it must be blocked on | |
920 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
921 | * simply exit once it acquires the mutex. | |
922 | */ | |
923 | cancel_delayed_work(&local->scan_work); | |
924 | /* and clean up */ | |
925 | __ieee80211_scan_completed(&local->hw, true, false); | |
926 | out: | |
d07bfd8b | 927 | mutex_unlock(&local->mtx); |
5bb644a0 | 928 | } |
79f460ca LC |
929 | |
930 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
931 | struct cfg80211_sched_scan_request *req) | |
932 | { | |
933 | struct ieee80211_local *local = sdata->local; | |
bca1e29f | 934 | struct ieee80211_sched_scan_ies sched_scan_ies = {}; |
c604b9f2 JB |
935 | int ret, i, iebufsz; |
936 | ||
937 | iebufsz = 2 + IEEE80211_MAX_SSID_LEN + | |
938 | local->scan_ies_len + req->ie_len; | |
79f460ca | 939 | |
5260a5b2 | 940 | mutex_lock(&local->mtx); |
79f460ca | 941 | |
5260a5b2 | 942 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
79f460ca LC |
943 | ret = -EBUSY; |
944 | goto out; | |
945 | } | |
946 | ||
947 | if (!local->ops->sched_scan_start) { | |
948 | ret = -ENOTSUPP; | |
949 | goto out; | |
950 | } | |
951 | ||
952 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
d811b3d5 AN |
953 | if (!local->hw.wiphy->bands[i]) |
954 | continue; | |
955 | ||
c604b9f2 | 956 | sched_scan_ies.ie[i] = kzalloc(iebufsz, GFP_KERNEL); |
30dd3edf | 957 | if (!sched_scan_ies.ie[i]) { |
79f460ca LC |
958 | ret = -ENOMEM; |
959 | goto out_free; | |
960 | } | |
961 | ||
30dd3edf JB |
962 | sched_scan_ies.len[i] = |
963 | ieee80211_build_preq_ies(local, sched_scan_ies.ie[i], | |
c604b9f2 JB |
964 | iebufsz, req->ie, req->ie_len, |
965 | i, (u32) -1, 0); | |
79f460ca LC |
966 | } |
967 | ||
30dd3edf JB |
968 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
969 | if (ret == 0) | |
5260a5b2 | 970 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
79f460ca LC |
971 | |
972 | out_free: | |
973 | while (i > 0) | |
30dd3edf | 974 | kfree(sched_scan_ies.ie[--i]); |
79f460ca | 975 | out: |
5260a5b2 | 976 | mutex_unlock(&local->mtx); |
79f460ca LC |
977 | return ret; |
978 | } | |
979 | ||
85a9994a | 980 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) |
79f460ca LC |
981 | { |
982 | struct ieee80211_local *local = sdata->local; | |
30dd3edf | 983 | int ret = 0; |
79f460ca | 984 | |
5260a5b2 | 985 | mutex_lock(&local->mtx); |
79f460ca LC |
986 | |
987 | if (!local->ops->sched_scan_stop) { | |
988 | ret = -ENOTSUPP; | |
989 | goto out; | |
990 | } | |
991 | ||
30dd3edf | 992 | if (rcu_access_pointer(local->sched_scan_sdata)) |
85a9994a | 993 | drv_sched_scan_stop(local, sdata); |
30dd3edf | 994 | |
79f460ca | 995 | out: |
5260a5b2 | 996 | mutex_unlock(&local->mtx); |
79f460ca LC |
997 | |
998 | return ret; | |
999 | } | |
1000 | ||
1001 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1002 | { | |
1003 | struct ieee80211_local *local = hw_to_local(hw); | |
1004 | ||
1005 | trace_api_sched_scan_results(local); | |
1006 | ||
1007 | cfg80211_sched_scan_results(hw->wiphy); | |
1008 | } | |
1009 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1010 | ||
85a9994a LC |
1011 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1012 | { | |
1013 | struct ieee80211_local *local = | |
1014 | container_of(work, struct ieee80211_local, | |
1015 | sched_scan_stopped_work); | |
85a9994a LC |
1016 | |
1017 | mutex_lock(&local->mtx); | |
1018 | ||
5260a5b2 | 1019 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1020 | mutex_unlock(&local->mtx); |
1021 | return; | |
1022 | } | |
1023 | ||
5260a5b2 | 1024 | rcu_assign_pointer(local->sched_scan_sdata, NULL); |
85a9994a LC |
1025 | |
1026 | mutex_unlock(&local->mtx); | |
1027 | ||
1028 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
1029 | } | |
1030 | ||
79f460ca LC |
1031 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1032 | { | |
1033 | struct ieee80211_local *local = hw_to_local(hw); | |
1034 | ||
1035 | trace_api_sched_scan_stopped(local); | |
1036 | ||
85a9994a | 1037 | ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work); |
79f460ca LC |
1038 | } |
1039 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |