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> | |
d98ad83e | 9 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
0a51b27e JB |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
0a51b27e | 16 | #include <linux/if_arp.h> |
888d04df | 17 | #include <linux/etherdevice.h> |
078e1e60 | 18 | #include <linux/rtnetlink.h> |
e8db0be1 | 19 | #include <linux/pm_qos.h> |
df13cce5 | 20 | #include <net/sch_generic.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
bc3b2d7f | 22 | #include <linux/export.h> |
0a51b27e | 23 | #include <net/mac80211.h> |
0a51b27e JB |
24 | |
25 | #include "ieee80211_i.h" | |
24487981 | 26 | #include "driver-ops.h" |
5484e237 | 27 | #include "mesh.h" |
0a51b27e JB |
28 | |
29 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
30 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
3f892b61 | 31 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) |
0a51b27e | 32 | |
5484e237 | 33 | void ieee80211_rx_bss_put(struct ieee80211_local *local, |
c2b13452 | 34 | struct ieee80211_bss *bss) |
5484e237 | 35 | { |
0c1ad2ca JB |
36 | if (!bss) |
37 | return; | |
5b112d3d JB |
38 | cfg80211_put_bss(local->hw.wiphy, |
39 | container_of((void *)bss, struct cfg80211_bss, priv)); | |
5484e237 JB |
40 | } |
41 | ||
ab13315a KV |
42 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
43 | { | |
44 | u8 qos_info; | |
45 | ||
46 | if (elems->wmm_info && elems->wmm_info_len == 7 | |
47 | && elems->wmm_info[5] == 1) | |
48 | qos_info = elems->wmm_info[6]; | |
49 | else if (elems->wmm_param && elems->wmm_param_len == 24 | |
50 | && elems->wmm_param[5] == 1) | |
51 | qos_info = elems->wmm_param[6]; | |
52 | else | |
53 | /* no valid wmm information or parameter element found */ | |
54 | return false; | |
55 | ||
56 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; | |
57 | } | |
58 | ||
c2b13452 | 59 | struct ieee80211_bss * |
5484e237 JB |
60 | ieee80211_bss_info_update(struct ieee80211_local *local, |
61 | struct ieee80211_rx_status *rx_status, | |
d45c4172 | 62 | struct ieee80211_mgmt *mgmt, size_t len, |
5484e237 | 63 | struct ieee802_11_elems *elems, |
d45c4172 | 64 | struct ieee80211_channel *channel) |
5484e237 | 65 | { |
d45c4172 | 66 | bool beacon = ieee80211_is_beacon(mgmt->frame_control); |
0c1ad2ca | 67 | struct cfg80211_bss *cbss; |
c2b13452 | 68 | struct ieee80211_bss *bss; |
f0b058b6 | 69 | int clen, srlen; |
7ca15a0a | 70 | enum nl80211_bss_scan_width scan_width; |
2a519311 JB |
71 | s32 signal = 0; |
72 | ||
77965c97 | 73 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 74 | signal = rx_status->signal * 100; |
77965c97 | 75 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 76 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 77 | |
7ca15a0a SW |
78 | scan_width = NL80211_BSS_CHAN_WIDTH_20; |
79 | if (rx_status->flag & RX_FLAG_5MHZ) | |
80 | scan_width = NL80211_BSS_CHAN_WIDTH_5; | |
81 | if (rx_status->flag & RX_FLAG_10MHZ) | |
82 | scan_width = NL80211_BSS_CHAN_WIDTH_10; | |
83 | ||
84 | cbss = cfg80211_inform_bss_width_frame(local->hw.wiphy, channel, | |
85 | scan_width, mgmt, len, signal, | |
86 | GFP_ATOMIC); | |
0c1ad2ca | 87 | if (!cbss) |
00d3f14c JB |
88 | return NULL; |
89 | ||
0c1ad2ca | 90 | bss = (void *)cbss->priv; |
5484e237 | 91 | |
ef429dad JB |
92 | if (beacon) |
93 | bss->device_ts_beacon = rx_status->device_timestamp; | |
94 | else | |
95 | bss->device_ts_presp = rx_status->device_timestamp; | |
8c358bcd | 96 | |
fcff4f10 PS |
97 | if (elems->parse_error) { |
98 | if (beacon) | |
99 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
100 | else | |
101 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
102 | } else { | |
103 | if (beacon) | |
104 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
105 | else | |
106 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
107 | } | |
108 | ||
5484e237 | 109 | /* save the ERP value so that it is available at association time */ |
1946bed9 JB |
110 | if (elems->erp_info && (!elems->parse_error || |
111 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 112 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 113 | bss->has_erp_value = true; |
fcff4f10 PS |
114 | if (!elems->parse_error) |
115 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
116 | } |
117 | ||
f0b058b6 | 118 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
119 | if (!elems->parse_error || |
120 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
121 | srlen = 0; | |
122 | if (elems->supp_rates) { | |
123 | clen = IEEE80211_MAX_SUPP_RATES; | |
124 | if (clen > elems->supp_rates_len) | |
125 | clen = elems->supp_rates_len; | |
126 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
127 | srlen += clen; | |
128 | } | |
129 | if (elems->ext_supp_rates) { | |
130 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
131 | if (clen > elems->ext_supp_rates_len) | |
132 | clen = elems->ext_supp_rates_len; | |
133 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
134 | clen); | |
135 | srlen += clen; | |
136 | } | |
137 | if (srlen) { | |
138 | bss->supp_rates_len = srlen; | |
139 | if (!elems->parse_error) | |
140 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
141 | } | |
5484e237 | 142 | } |
5484e237 | 143 | |
fcff4f10 PS |
144 | if (!elems->parse_error || |
145 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
146 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
147 | bss->uapsd_supported = is_uapsd_supported(elems); | |
148 | if (!elems->parse_error) | |
149 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
150 | } | |
5484e237 | 151 | |
817cee76 AB |
152 | if (beacon) { |
153 | struct ieee80211_supported_band *sband = | |
154 | local->hw.wiphy->bands[rx_status->band]; | |
155 | if (!(rx_status->flag & RX_FLAG_HT) && | |
156 | !(rx_status->flag & RX_FLAG_VHT)) | |
157 | bss->beacon_rate = | |
158 | &sband->bitrates[rx_status->rate_idx]; | |
159 | } | |
160 | ||
5484e237 JB |
161 | return bss; |
162 | } | |
0a51b27e | 163 | |
d48b2968 | 164 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 165 | { |
f1d58c25 | 166 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
167 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
168 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 169 | struct ieee80211_bss *bss; |
98c8fccf JB |
170 | u8 *elements; |
171 | struct ieee80211_channel *channel; | |
172 | size_t baselen; | |
98c8fccf JB |
173 | struct ieee802_11_elems elems; |
174 | ||
d48b2968 JB |
175 | if (skb->len < 24 || |
176 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
177 | !ieee80211_is_beacon(mgmt->frame_control))) | |
178 | return; | |
98c8fccf | 179 | |
d48b2968 JB |
180 | sdata1 = rcu_dereference(local->scan_sdata); |
181 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 182 | |
d48b2968 JB |
183 | if (likely(!sdata1 && !sdata2)) |
184 | return; | |
98c8fccf | 185 | |
d48b2968 | 186 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
98c8fccf | 187 | /* ignore ProbeResp to foreign address */ |
d48b2968 JB |
188 | if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && |
189 | (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) | |
190 | return; | |
98c8fccf | 191 | |
98c8fccf JB |
192 | elements = mgmt->u.probe_resp.variable; |
193 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
194 | } else { | |
98c8fccf JB |
195 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
196 | elements = mgmt->u.beacon.variable; | |
197 | } | |
198 | ||
98c8fccf | 199 | if (baselen > skb->len) |
d48b2968 | 200 | return; |
98c8fccf | 201 | |
b2e506bf | 202 | ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); |
98c8fccf | 203 | |
0172bb75 | 204 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
205 | |
206 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 207 | return; |
98c8fccf | 208 | |
d48b2968 | 209 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 210 | mgmt, skb->len, &elems, |
d45c4172 | 211 | channel); |
d048e503 | 212 | if (bss) |
d48b2968 | 213 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
214 | } |
215 | ||
2103dec1 SW |
216 | static void |
217 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, | |
218 | enum nl80211_bss_scan_width scan_width) | |
219 | { | |
220 | memset(chandef, 0, sizeof(*chandef)); | |
221 | switch (scan_width) { | |
222 | case NL80211_BSS_CHAN_WIDTH_5: | |
223 | chandef->width = NL80211_CHAN_WIDTH_5; | |
224 | break; | |
225 | case NL80211_BSS_CHAN_WIDTH_10: | |
226 | chandef->width = NL80211_CHAN_WIDTH_10; | |
227 | break; | |
228 | default: | |
229 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
230 | break; | |
231 | } | |
232 | } | |
233 | ||
4d36ec58 JB |
234 | /* return false if no more work */ |
235 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
236 | { | |
6ea0a69c | 237 | struct cfg80211_scan_request *req; |
2103dec1 | 238 | struct cfg80211_chan_def chandef; |
c56ef672 | 239 | u8 bands_used = 0; |
4d36ec58 JB |
240 | int i, ielen, n_chans; |
241 | ||
6ea0a69c JB |
242 | req = rcu_dereference_protected(local->scan_req, |
243 | lockdep_is_held(&local->mtx)); | |
244 | ||
a754055a EG |
245 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
246 | return false; | |
247 | ||
c56ef672 | 248 | if (local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) { |
4d36ec58 | 249 | for (i = 0; i < req->n_channels; i++) { |
c56ef672 DS |
250 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
251 | bands_used |= BIT(req->channels[i]->band); | |
252 | } | |
253 | ||
254 | n_chans = req->n_channels; | |
255 | } else { | |
256 | do { | |
257 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
258 | return false; | |
259 | ||
260 | n_chans = 0; | |
261 | ||
262 | for (i = 0; i < req->n_channels; i++) { | |
263 | if (req->channels[i]->band != | |
264 | local->hw_scan_band) | |
265 | continue; | |
266 | local->hw_scan_req->req.channels[n_chans] = | |
4d36ec58 JB |
267 | req->channels[i]; |
268 | n_chans++; | |
c56ef672 | 269 | bands_used |= BIT(req->channels[i]->band); |
4d36ec58 | 270 | } |
4d36ec58 | 271 | |
c56ef672 DS |
272 | local->hw_scan_band++; |
273 | } while (!n_chans); | |
274 | } | |
4d36ec58 | 275 | |
c56ef672 | 276 | local->hw_scan_req->req.n_channels = n_chans; |
2103dec1 | 277 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
4d36ec58 | 278 | |
c56ef672 DS |
279 | ielen = ieee80211_build_preq_ies(local, |
280 | (u8 *)local->hw_scan_req->req.ie, | |
c604b9f2 | 281 | local->hw_scan_ies_bufsize, |
c56ef672 DS |
282 | &local->hw_scan_req->ies, |
283 | req->ie, req->ie_len, | |
284 | bands_used, req->rates, &chandef); | |
285 | local->hw_scan_req->req.ie_len = ielen; | |
286 | local->hw_scan_req->req.no_cck = req->no_cck; | |
4d36ec58 JB |
287 | |
288 | return true; | |
289 | } | |
290 | ||
8bd2a248 | 291 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
292 | { |
293 | struct ieee80211_local *local = hw_to_local(hw); | |
8bd2a248 | 294 | bool hw_scan = local->ops->hw_scan; |
a2b70e83 | 295 | bool was_scanning = local->scanning; |
6ea0a69c | 296 | struct cfg80211_scan_request *scan_req; |
0a51b27e | 297 | |
e229f844 | 298 | lockdep_assert_held(&local->mtx); |
5bc75728 | 299 | |
6d3560d4 JB |
300 | /* |
301 | * It's ok to abort a not-yet-running scan (that | |
302 | * we have one at all will be verified by checking | |
303 | * local->scan_req next), but not to complete it | |
304 | * successfully. | |
305 | */ | |
306 | if (WARN_ON(!local->scanning && !aborted)) | |
307 | aborted = true; | |
5bc75728 | 308 | |
e229f844 | 309 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 310 | return; |
de95a54b | 311 | |
c56ef672 DS |
312 | if (hw_scan && !aborted && |
313 | !(local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) && | |
314 | ieee80211_prep_hw_scan(local)) { | |
e2fd5dbc JB |
315 | int rc; |
316 | ||
317 | rc = drv_hw_scan(local, | |
318 | rcu_dereference_protected(local->scan_sdata, | |
319 | lockdep_is_held(&local->mtx)), | |
320 | local->hw_scan_req); | |
321 | ||
6eb11a9a | 322 | if (rc == 0) |
d07bfd8b | 323 | return; |
4d36ec58 JB |
324 | } |
325 | ||
326 | kfree(local->hw_scan_req); | |
327 | local->hw_scan_req = NULL; | |
f3b85252 | 328 | |
6ea0a69c JB |
329 | scan_req = rcu_dereference_protected(local->scan_req, |
330 | lockdep_is_held(&local->mtx)); | |
331 | ||
332 | if (scan_req != local->int_scan_req) | |
333 | cfg80211_scan_done(scan_req, aborted); | |
334 | RCU_INIT_POINTER(local->scan_req, NULL); | |
0c2bef46 | 335 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
2a519311 | 336 | |
fbe9c429 | 337 | local->scanning = 0; |
7ca15a0a | 338 | local->scan_chandef.chan = NULL; |
f3b85252 | 339 | |
07ef03ee JB |
340 | /* Set power back to normal operating levels. */ |
341 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 342 | |
8bd2a248 | 343 | if (!hw_scan) { |
e229f844 SG |
344 | ieee80211_configure_filter(local); |
345 | drv_sw_scan_complete(local); | |
aacde9ee | 346 | ieee80211_offchannel_return(local); |
e229f844 | 347 | } |
0a51b27e | 348 | |
5cff20e6 | 349 | ieee80211_recalc_idle(local); |
e229f844 | 350 | |
0a51b27e | 351 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 352 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 353 | ieee80211_mesh_notify_scan_completed(local); |
a2b70e83 EP |
354 | if (was_scanning) |
355 | ieee80211_start_next_roc(local); | |
0a51b27e | 356 | } |
8789d459 JB |
357 | |
358 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
359 | { | |
360 | struct ieee80211_local *local = hw_to_local(hw); | |
361 | ||
362 | trace_api_scan_completed(local, aborted); | |
363 | ||
364 | set_bit(SCAN_COMPLETED, &local->scanning); | |
365 | if (aborted) | |
366 | set_bit(SCAN_ABORTED, &local->scanning); | |
367 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
368 | } | |
0a51b27e JB |
369 | EXPORT_SYMBOL(ieee80211_scan_completed); |
370 | ||
f3b85252 JB |
371 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
372 | { | |
fe57d9f5 JB |
373 | /* Software scan is not supported in multi-channel cases */ |
374 | if (local->use_chanctx) | |
375 | return -EOPNOTSUPP; | |
376 | ||
f3b85252 JB |
377 | /* |
378 | * Hardware/driver doesn't support hw_scan, so use software | |
379 | * scanning instead. First send a nullfunc frame with power save | |
380 | * bit on so that AP will buffer the frames for us while we are not | |
381 | * listening, then send probe requests to each channel and wait for | |
382 | * the responses. After all channels are scanned, tune back to the | |
383 | * original channel and send a nullfunc frame with power save bit | |
384 | * off to trigger the AP to send us all the buffered frames. | |
385 | * | |
386 | * Note that while local->sw_scanning is true everything else but | |
387 | * nullfunc frames and probe requests will be dropped in | |
388 | * ieee80211_tx_h_check_assoc(). | |
389 | */ | |
24487981 | 390 | drv_sw_scan_start(local); |
f3b85252 | 391 | |
de312db3 | 392 | local->leave_oper_channel_time = jiffies; |
977923b0 | 393 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
394 | local->scan_channel_idx = 0; |
395 | ||
aacde9ee | 396 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 397 | |
9c35d7d2 | 398 | /* ensure nullfunc is transmitted before leaving operating channel */ |
39ecc01d | 399 | ieee80211_flush_queues(local, NULL); |
9c35d7d2 | 400 | |
3ac64bee | 401 | ieee80211_configure_filter(local); |
f3b85252 | 402 | |
59bdf3b0 BG |
403 | /* We need to set power level at maximum rate for scanning. */ |
404 | ieee80211_hw_config(local, 0); | |
405 | ||
42935eca | 406 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 407 | &local->scan_work, 0); |
f3b85252 JB |
408 | |
409 | return 0; | |
410 | } | |
411 | ||
133d40f9 SG |
412 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
413 | struct ieee80211_sub_if_data *sdata) | |
414 | { | |
164eb02d SW |
415 | if (local->radar_detect_enabled) |
416 | return false; | |
417 | ||
2eb278e0 | 418 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
419 | return false; |
420 | ||
421 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
392b9ffb | 422 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
133d40f9 SG |
423 | return false; |
424 | ||
425 | return true; | |
426 | } | |
427 | ||
428 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
429 | { | |
430 | lockdep_assert_held(&local->mtx); | |
431 | ||
432 | if (!local->scan_req || local->scanning) | |
433 | return; | |
434 | ||
e2fd5dbc JB |
435 | if (!ieee80211_can_scan(local, |
436 | rcu_dereference_protected( | |
437 | local->scan_sdata, | |
438 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
439 | return; |
440 | ||
441 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
442 | round_jiffies_relative(0)); | |
443 | } | |
f3b85252 | 444 | |
8a690674 BG |
445 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
446 | unsigned long *next_delay) | |
447 | { | |
448 | int i; | |
e2fd5dbc | 449 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 450 | struct cfg80211_scan_request *scan_req; |
675a0b04 | 451 | enum ieee80211_band band = local->hw.conf.chandef.chan->band; |
6c17b77b SF |
452 | u32 tx_flags; |
453 | ||
6ea0a69c JB |
454 | scan_req = rcu_dereference_protected(local->scan_req, |
455 | lockdep_is_held(&local->mtx)); | |
456 | ||
6c17b77b | 457 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
6ea0a69c | 458 | if (scan_req->no_cck) |
6c17b77b | 459 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
8a690674 | 460 | |
e2fd5dbc | 461 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 462 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 463 | |
6ea0a69c | 464 | for (i = 0; i < scan_req->n_ssids; i++) |
8a690674 BG |
465 | ieee80211_send_probe_req( |
466 | sdata, NULL, | |
6ea0a69c JB |
467 | scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, |
468 | scan_req->ie, scan_req->ie_len, | |
469 | scan_req->rates[band], false, | |
675a0b04 | 470 | tx_flags, local->hw.conf.chandef.chan, true); |
8a690674 BG |
471 | |
472 | /* | |
473 | * After sending probe requests, wait for probe responses | |
474 | * on the channel. | |
475 | */ | |
476 | *next_delay = IEEE80211_CHANNEL_TIME; | |
477 | local->next_scan_state = SCAN_DECISION; | |
478 | } | |
479 | ||
f3b85252 JB |
480 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
481 | struct cfg80211_scan_request *req) | |
482 | { | |
483 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
484 | int rc; |
485 | ||
e229f844 SG |
486 | lockdep_assert_held(&local->mtx); |
487 | ||
f3b85252 JB |
488 | if (local->scan_req) |
489 | return -EBUSY; | |
490 | ||
133d40f9 | 491 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 492 | /* wait for the work to finish/time out */ |
6ea0a69c | 493 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 494 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
495 | return 0; |
496 | } | |
497 | ||
f3b85252 JB |
498 | if (local->ops->hw_scan) { |
499 | u8 *ies; | |
f3b85252 | 500 | |
e4dcbb37 | 501 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
c56ef672 DS |
502 | |
503 | if (local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) { | |
504 | int i, n_bands = 0; | |
505 | u8 bands_counted = 0; | |
506 | ||
507 | for (i = 0; i < req->n_channels; i++) { | |
508 | if (bands_counted & BIT(req->channels[i]->band)) | |
509 | continue; | |
510 | bands_counted |= BIT(req->channels[i]->band); | |
511 | n_bands++; | |
512 | } | |
513 | ||
514 | local->hw_scan_ies_bufsize *= n_bands; | |
515 | } | |
516 | ||
4d36ec58 JB |
517 | local->hw_scan_req = kmalloc( |
518 | sizeof(*local->hw_scan_req) + | |
519 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 520 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 521 | if (!local->hw_scan_req) |
f3b85252 JB |
522 | return -ENOMEM; |
523 | ||
c56ef672 DS |
524 | local->hw_scan_req->req.ssids = req->ssids; |
525 | local->hw_scan_req->req.n_ssids = req->n_ssids; | |
4d36ec58 JB |
526 | ies = (u8 *)local->hw_scan_req + |
527 | sizeof(*local->hw_scan_req) + | |
528 | req->n_channels * sizeof(req->channels[0]); | |
c56ef672 DS |
529 | local->hw_scan_req->req.ie = ies; |
530 | local->hw_scan_req->req.flags = req->flags; | |
4d36ec58 JB |
531 | |
532 | local->hw_scan_band = 0; | |
6e7e6213 JL |
533 | |
534 | /* | |
535 | * After allocating local->hw_scan_req, we must | |
536 | * go through until ieee80211_prep_hw_scan(), so | |
537 | * anything that might be changed here and leave | |
538 | * this function early must not go after this | |
539 | * allocation. | |
540 | */ | |
f3b85252 JB |
541 | } |
542 | ||
6ea0a69c | 543 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 544 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 545 | |
8a690674 | 546 | if (local->ops->hw_scan) { |
fbe9c429 | 547 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 548 | } else if ((req->n_channels == 1) && |
675a0b04 | 549 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
550 | /* |
551 | * If we are scanning only on the operating channel | |
552 | * then we do not need to stop normal activities | |
8a690674 BG |
553 | */ |
554 | unsigned long next_delay; | |
555 | ||
556 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
557 | ||
558 | ieee80211_recalc_idle(local); | |
559 | ||
560 | /* Notify driver scan is starting, keep order of operations | |
561 | * same as normal software scan, in case that matters. */ | |
562 | drv_sw_scan_start(local); | |
563 | ||
564 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
565 | ||
566 | /* We need to ensure power level is at max for scanning. */ | |
567 | ieee80211_hw_config(local, 0); | |
568 | ||
569 | if ((req->channels[0]->flags & | |
8fe02e16 | 570 | IEEE80211_CHAN_NO_IR) || |
6ea0a69c | 571 | !req->n_ssids) { |
8a690674 BG |
572 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
573 | } else { | |
574 | ieee80211_scan_state_send_probe(local, &next_delay); | |
575 | next_delay = IEEE80211_CHANNEL_TIME; | |
576 | } | |
577 | ||
578 | /* Now, just wait a bit and we are all done! */ | |
579 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
580 | next_delay); | |
581 | return 0; | |
582 | } else { | |
583 | /* Do normal software scan */ | |
fbe9c429 | 584 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 585 | } |
6e7e6213 | 586 | |
5cff20e6 | 587 | ieee80211_recalc_idle(local); |
f3b85252 | 588 | |
4d36ec58 JB |
589 | if (local->ops->hw_scan) { |
590 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 591 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
4d36ec58 | 592 | } else |
f3b85252 JB |
593 | rc = ieee80211_start_sw_scan(local); |
594 | ||
f3b85252 | 595 | if (rc) { |
4d36ec58 JB |
596 | kfree(local->hw_scan_req); |
597 | local->hw_scan_req = NULL; | |
fbe9c429 | 598 | local->scanning = 0; |
f3b85252 | 599 | |
5cff20e6 JB |
600 | ieee80211_recalc_idle(local); |
601 | ||
f3b85252 | 602 | local->scan_req = NULL; |
0c2bef46 | 603 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 JB |
604 | } |
605 | ||
606 | return rc; | |
607 | } | |
608 | ||
df13cce5 HS |
609 | static unsigned long |
610 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
611 | { | |
612 | /* | |
613 | * TODO: channel switching also consumes quite some time, | |
614 | * add that delay as well to get a better estimation | |
615 | */ | |
8fe02e16 | 616 | if (chan->flags & IEEE80211_CHAN_NO_IR) |
df13cce5 HS |
617 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
618 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
619 | } | |
620 | ||
e229f844 SG |
621 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
622 | unsigned long *next_delay) | |
7d3be3cc | 623 | { |
142b9f50 | 624 | bool associated = false; |
df13cce5 HS |
625 | bool tx_empty = true; |
626 | bool bad_latency; | |
142b9f50 | 627 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 628 | struct ieee80211_channel *next_chan; |
cd2bb512 | 629 | enum mac80211_scan_state next_scan_state; |
6ea0a69c | 630 | struct cfg80211_scan_request *scan_req; |
142b9f50 | 631 | |
df13cce5 HS |
632 | /* |
633 | * check if at least one STA interface is associated, | |
634 | * check if at least one STA interface has pending tx frames | |
635 | * and grab the lowest used beacon interval | |
636 | */ | |
142b9f50 HS |
637 | mutex_lock(&local->iflist_mtx); |
638 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 639 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
640 | continue; |
641 | ||
642 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
643 | if (sdata->u.mgd.associated) { | |
644 | associated = true; | |
df13cce5 | 645 | |
df13cce5 HS |
646 | if (!qdisc_all_tx_empty(sdata->dev)) { |
647 | tx_empty = false; | |
648 | break; | |
649 | } | |
142b9f50 HS |
650 | } |
651 | } | |
652 | } | |
653 | mutex_unlock(&local->iflist_mtx); | |
654 | ||
6ea0a69c JB |
655 | scan_req = rcu_dereference_protected(local->scan_req, |
656 | lockdep_is_held(&local->mtx)); | |
657 | ||
658 | next_chan = scan_req->channels[local->scan_channel_idx]; | |
b23b025f | 659 | |
a80f7c0b | 660 | /* |
07ef03ee JB |
661 | * we're currently scanning a different channel, let's |
662 | * see if we can scan another channel without interfering | |
663 | * with the current traffic situation. | |
664 | * | |
3f892b61 | 665 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 666 | */ |
a80f7c0b | 667 | |
07ef03ee | 668 | bad_latency = time_after(jiffies + |
3f892b61 SG |
669 | ieee80211_scan_get_channel_time(next_chan), |
670 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 671 | |
cd2bb512 | 672 | if (associated && !tx_empty) { |
6ea0a69c | 673 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
cd2bb512 SL |
674 | next_scan_state = SCAN_ABORT; |
675 | else | |
676 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 677 | } else if (associated && bad_latency) { |
cd2bb512 SL |
678 | next_scan_state = SCAN_SUSPEND; |
679 | } else { | |
680 | next_scan_state = SCAN_SET_CHANNEL; | |
681 | } | |
682 | ||
683 | local->next_scan_state = next_scan_state; | |
142b9f50 | 684 | |
07ef03ee | 685 | *next_delay = 0; |
142b9f50 HS |
686 | } |
687 | ||
2fb3f028 HS |
688 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
689 | unsigned long *next_delay) | |
690 | { | |
691 | int skip; | |
692 | struct ieee80211_channel *chan; | |
7ca15a0a | 693 | enum nl80211_bss_scan_width oper_scan_width; |
6ea0a69c JB |
694 | struct cfg80211_scan_request *scan_req; |
695 | ||
696 | scan_req = rcu_dereference_protected(local->scan_req, | |
697 | lockdep_is_held(&local->mtx)); | |
2fb3f028 | 698 | |
7d3be3cc | 699 | skip = 0; |
6ea0a69c | 700 | chan = scan_req->channels[local->scan_channel_idx]; |
7d3be3cc | 701 | |
7ca15a0a SW |
702 | local->scan_chandef.chan = chan; |
703 | local->scan_chandef.center_freq1 = chan->center_freq; | |
704 | local->scan_chandef.center_freq2 = 0; | |
6ea0a69c | 705 | switch (scan_req->scan_width) { |
7ca15a0a SW |
706 | case NL80211_BSS_CHAN_WIDTH_5: |
707 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; | |
708 | break; | |
709 | case NL80211_BSS_CHAN_WIDTH_10: | |
710 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; | |
711 | break; | |
712 | case NL80211_BSS_CHAN_WIDTH_20: | |
713 | /* If scanning on oper channel, use whatever channel-type | |
714 | * is currently in use. | |
715 | */ | |
716 | oper_scan_width = cfg80211_chandef_to_scan_width( | |
717 | &local->_oper_chandef); | |
718 | if (chan == local->_oper_chandef.chan && | |
6ea0a69c | 719 | oper_scan_width == scan_req->scan_width) |
7ca15a0a SW |
720 | local->scan_chandef = local->_oper_chandef; |
721 | else | |
722 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; | |
723 | break; | |
724 | } | |
b23b025f | 725 | |
07ef03ee JB |
726 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
727 | skip = 1; | |
7d3be3cc | 728 | |
7d3be3cc HS |
729 | /* advance state machine to next channel/band */ |
730 | local->scan_channel_idx++; | |
731 | ||
0ee9c13c HS |
732 | if (skip) { |
733 | /* if we skip this channel return to the decision state */ | |
734 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 735 | return; |
0ee9c13c | 736 | } |
7d3be3cc HS |
737 | |
738 | /* | |
739 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
740 | * (which unfortunately doesn't say _why_ step a) is done, | |
741 | * but it waits for the probe delay or until a frame is | |
742 | * received - and the received frame would update the NAV). | |
743 | * For now, we do not support waiting until a frame is | |
744 | * received. | |
745 | * | |
746 | * In any case, it is not necessary for a passive scan. | |
747 | */ | |
6ea0a69c | 748 | if (chan->flags & IEEE80211_CHAN_NO_IR || !scan_req->n_ssids) { |
7d3be3cc | 749 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
977923b0 | 750 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 751 | return; |
7d3be3cc HS |
752 | } |
753 | ||
2fb3f028 | 754 | /* active scan, send probes */ |
7d3be3cc | 755 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 756 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
757 | } |
758 | ||
07ef03ee JB |
759 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
760 | unsigned long *next_delay) | |
761 | { | |
762 | /* switch back to the operating channel */ | |
7ca15a0a | 763 | local->scan_chandef.chan = NULL; |
07ef03ee JB |
764 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
765 | ||
aacde9ee SG |
766 | /* disable PS */ |
767 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
768 | |
769 | *next_delay = HZ / 5; | |
770 | /* afterwards, resume scan & go to next channel */ | |
771 | local->next_scan_state = SCAN_RESUME; | |
772 | } | |
773 | ||
774 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
775 | unsigned long *next_delay) | |
776 | { | |
aacde9ee | 777 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
778 | |
779 | if (local->ops->flush) { | |
39ecc01d | 780 | ieee80211_flush_queues(local, NULL); |
07ef03ee JB |
781 | *next_delay = 0; |
782 | } else | |
783 | *next_delay = HZ / 10; | |
784 | ||
785 | /* remember when we left the operating channel */ | |
786 | local->leave_oper_channel_time = jiffies; | |
787 | ||
788 | /* advance to the next channel to be scanned */ | |
de2ee84d | 789 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
790 | } |
791 | ||
c2b13452 | 792 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
793 | { |
794 | struct ieee80211_local *local = | |
795 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 796 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 797 | struct cfg80211_scan_request *scan_req; |
0a51b27e | 798 | unsigned long next_delay = 0; |
8bd2a248 | 799 | bool aborted; |
0a51b27e | 800 | |
259b62e3 | 801 | mutex_lock(&local->mtx); |
8789d459 | 802 | |
e2fd5dbc JB |
803 | sdata = rcu_dereference_protected(local->scan_sdata, |
804 | lockdep_is_held(&local->mtx)); | |
6ea0a69c JB |
805 | scan_req = rcu_dereference_protected(local->scan_req, |
806 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 807 | |
8a690674 BG |
808 | /* When scanning on-channel, the first-callback means completed. */ |
809 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
810 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
811 | goto out_complete; | |
812 | } | |
813 | ||
259b62e3 | 814 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 815 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 816 | goto out_complete; |
8789d459 JB |
817 | } |
818 | ||
6ea0a69c | 819 | if (!sdata || !scan_req) |
259b62e3 | 820 | goto out; |
f3b85252 | 821 | |
ff5db439 | 822 | if (!local->scanning) { |
f3b85252 JB |
823 | int rc; |
824 | ||
6ea0a69c | 825 | RCU_INIT_POINTER(local->scan_req, NULL); |
0c2bef46 | 826 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 | 827 | |
6ea0a69c | 828 | rc = __ieee80211_start_scan(sdata, scan_req); |
259b62e3 | 829 | if (rc) { |
3aed49ef | 830 | /* need to complete scan in cfg80211 */ |
6ea0a69c | 831 | rcu_assign_pointer(local->scan_req, scan_req); |
259b62e3 SG |
832 | aborted = true; |
833 | goto out_complete; | |
834 | } else | |
835 | goto out; | |
f3b85252 JB |
836 | } |
837 | ||
f502d09b HS |
838 | /* |
839 | * as long as no delay is required advance immediately | |
840 | * without scheduling a new work | |
841 | */ | |
842 | do { | |
c29acf20 RM |
843 | if (!ieee80211_sdata_running(sdata)) { |
844 | aborted = true; | |
845 | goto out_complete; | |
846 | } | |
847 | ||
977923b0 | 848 | switch (local->next_scan_state) { |
2fb3f028 | 849 | case SCAN_DECISION: |
e229f844 | 850 | /* if no more bands/channels left, complete scan */ |
6ea0a69c | 851 | if (local->scan_channel_idx >= scan_req->n_channels) { |
e229f844 SG |
852 | aborted = false; |
853 | goto out_complete; | |
854 | } | |
855 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 856 | break; |
2fb3f028 HS |
857 | case SCAN_SET_CHANNEL: |
858 | ieee80211_scan_state_set_channel(local, &next_delay); | |
859 | break; | |
f502d09b HS |
860 | case SCAN_SEND_PROBE: |
861 | ieee80211_scan_state_send_probe(local, &next_delay); | |
862 | break; | |
07ef03ee JB |
863 | case SCAN_SUSPEND: |
864 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 865 | break; |
07ef03ee JB |
866 | case SCAN_RESUME: |
867 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 868 | break; |
cd2bb512 SL |
869 | case SCAN_ABORT: |
870 | aborted = true; | |
871 | goto out_complete; | |
f502d09b HS |
872 | } |
873 | } while (next_delay == 0); | |
0a51b27e | 874 | |
42935eca | 875 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 876 | goto out; |
259b62e3 SG |
877 | |
878 | out_complete: | |
8bd2a248 | 879 | __ieee80211_scan_completed(&local->hw, aborted); |
259b62e3 SG |
880 | out: |
881 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
882 | } |
883 | ||
f3b85252 JB |
884 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
885 | struct cfg80211_scan_request *req) | |
0a51b27e | 886 | { |
f3b85252 | 887 | int res; |
de95a54b | 888 | |
a1699b75 | 889 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 890 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 891 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 892 | |
f3b85252 | 893 | return res; |
0a51b27e JB |
894 | } |
895 | ||
34bcf715 SG |
896 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
897 | const u8 *ssid, u8 ssid_len, | |
7ca15a0a SW |
898 | struct ieee80211_channel *chan, |
899 | enum nl80211_bss_scan_width scan_width) | |
0a51b27e | 900 | { |
0a51b27e | 901 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 902 | int ret = -EBUSY; |
fb63bc41 | 903 | enum ieee80211_band band; |
2a519311 | 904 | |
a1699b75 | 905 | mutex_lock(&local->mtx); |
0a51b27e | 906 | |
f3b85252 JB |
907 | /* busy scanning */ |
908 | if (local->scan_req) | |
909 | goto unlock; | |
9116dd01 | 910 | |
be4a4b6a JB |
911 | /* fill internal scan request */ |
912 | if (!chan) { | |
34bcf715 SG |
913 | int i, max_n; |
914 | int n_ch = 0; | |
be4a4b6a JB |
915 | |
916 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
917 | if (!local->hw.wiphy->bands[band]) | |
918 | continue; | |
34bcf715 SG |
919 | |
920 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
921 | for (i = 0; i < max_n; i++) { | |
922 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 923 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 | 924 | |
8fe02e16 | 925 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
926 | IEEE80211_CHAN_DISABLED)) |
927 | continue; | |
928 | ||
929 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
930 | n_ch++; | |
be4a4b6a JB |
931 | } |
932 | } | |
933 | ||
34bcf715 SG |
934 | if (WARN_ON_ONCE(n_ch == 0)) |
935 | goto unlock; | |
936 | ||
937 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 938 | } else { |
8fe02e16 | 939 | if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
940 | IEEE80211_CHAN_DISABLED))) |
941 | goto unlock; | |
942 | ||
be4a4b6a JB |
943 | local->int_scan_req->channels[0] = chan; |
944 | local->int_scan_req->n_channels = 1; | |
945 | } | |
946 | ||
947 | local->int_scan_req->ssids = &local->scan_ssid; | |
948 | local->int_scan_req->n_ssids = 1; | |
7ca15a0a | 949 | local->int_scan_req->scan_width = scan_width; |
5ba63533 JB |
950 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
951 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 952 | |
5ba63533 | 953 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 954 | unlock: |
a1699b75 | 955 | mutex_unlock(&local->mtx); |
f3b85252 | 956 | return ret; |
0a51b27e | 957 | } |
5bb644a0 | 958 | |
4136c422 SG |
959 | /* |
960 | * Only call this function when a scan can't be queued -- under RTNL. | |
961 | */ | |
5bb644a0 JB |
962 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
963 | { | |
5bb644a0 | 964 | /* |
b856439b | 965 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
966 | * yet really started (see __ieee80211_start_scan ). |
967 | * | |
968 | * Regarding hardware scan: | |
969 | * - we can not call __ieee80211_scan_completed() as when | |
970 | * SCAN_HW_SCANNING bit is set this function change | |
971 | * local->hw_scan_req to operate on 5G band, what race with | |
972 | * driver which can use local->hw_scan_req | |
973 | * | |
974 | * - we can not cancel scan_work since driver can schedule it | |
975 | * by ieee80211_scan_completed(..., true) to finish scan | |
976 | * | |
b856439b EP |
977 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
978 | * driver is still responsible for calling ieee80211_scan_completed() | |
979 | * after the scan was completed/aborted. | |
5bb644a0 | 980 | */ |
4136c422 | 981 | |
a1699b75 | 982 | mutex_lock(&local->mtx); |
b856439b EP |
983 | if (!local->scan_req) |
984 | goto out; | |
985 | ||
a754055a EG |
986 | /* |
987 | * We have a scan running and the driver already reported completion, | |
988 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
989 | * cancelled. | |
990 | */ | |
991 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
992 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
993 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
994 | goto out; | |
995 | } | |
996 | ||
b856439b | 997 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
a754055a EG |
998 | /* |
999 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
1000 | * scan on another band. | |
1001 | */ | |
1002 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 1003 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
1004 | drv_cancel_hw_scan(local, |
1005 | rcu_dereference_protected(local->scan_sdata, | |
1006 | lockdep_is_held(&local->mtx))); | |
b856439b | 1007 | goto out; |
4136c422 | 1008 | } |
b856439b EP |
1009 | |
1010 | /* | |
1011 | * If the work is currently running, it must be blocked on | |
1012 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
1013 | * simply exit once it acquires the mutex. | |
1014 | */ | |
1015 | cancel_delayed_work(&local->scan_work); | |
1016 | /* and clean up */ | |
8bd2a248 | 1017 | __ieee80211_scan_completed(&local->hw, true); |
b856439b | 1018 | out: |
d07bfd8b | 1019 | mutex_unlock(&local->mtx); |
5bb644a0 | 1020 | } |
79f460ca | 1021 | |
d43c6b6e DS |
1022 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1023 | struct cfg80211_sched_scan_request *req) | |
79f460ca LC |
1024 | { |
1025 | struct ieee80211_local *local = sdata->local; | |
633e2713 | 1026 | struct ieee80211_scan_ies sched_scan_ies = {}; |
2103dec1 | 1027 | struct cfg80211_chan_def chandef; |
633e2713 DS |
1028 | int ret, i, iebufsz, num_bands = 0; |
1029 | u32 rate_masks[IEEE80211_NUM_BANDS] = {}; | |
1030 | u8 bands_used = 0; | |
1031 | u8 *ie; | |
1032 | size_t len; | |
c604b9f2 | 1033 | |
e4dcbb37 | 1034 | iebufsz = local->scan_ies_len + req->ie_len; |
79f460ca | 1035 | |
d43c6b6e | 1036 | lockdep_assert_held(&local->mtx); |
79f460ca | 1037 | |
d43c6b6e DS |
1038 | if (!local->ops->sched_scan_start) |
1039 | return -ENOTSUPP; | |
79f460ca LC |
1040 | |
1041 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
633e2713 DS |
1042 | if (local->hw.wiphy->bands[i]) { |
1043 | bands_used |= BIT(i); | |
1044 | rate_masks[i] = (u32) -1; | |
1045 | num_bands++; | |
79f460ca | 1046 | } |
633e2713 | 1047 | } |
79f460ca | 1048 | |
633e2713 DS |
1049 | ie = kzalloc(num_bands * iebufsz, GFP_KERNEL); |
1050 | if (!ie) { | |
1051 | ret = -ENOMEM; | |
1052 | goto out; | |
79f460ca LC |
1053 | } |
1054 | ||
633e2713 DS |
1055 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
1056 | ||
1057 | len = ieee80211_build_preq_ies(local, ie, num_bands * iebufsz, | |
1058 | &sched_scan_ies, req->ie, | |
1059 | req->ie_len, bands_used, | |
1060 | rate_masks, &chandef); | |
1061 | ||
30dd3edf | 1062 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
d43c6b6e | 1063 | if (ret == 0) { |
5260a5b2 | 1064 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
6ea0a69c | 1065 | rcu_assign_pointer(local->sched_scan_req, req); |
d43c6b6e | 1066 | } |
79f460ca | 1067 | |
633e2713 | 1068 | kfree(ie); |
d43c6b6e | 1069 | |
633e2713 | 1070 | out: |
d43c6b6e DS |
1071 | if (ret) { |
1072 | /* Clean in case of failure after HW restart or upon resume. */ | |
0c2bef46 | 1073 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
6ea0a69c | 1074 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e DS |
1075 | } |
1076 | ||
1077 | return ret; | |
1078 | } | |
1079 | ||
1080 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
1081 | struct cfg80211_sched_scan_request *req) | |
1082 | { | |
1083 | struct ieee80211_local *local = sdata->local; | |
1084 | int ret; | |
1085 | ||
1086 | mutex_lock(&local->mtx); | |
1087 | ||
1088 | if (rcu_access_pointer(local->sched_scan_sdata)) { | |
1089 | mutex_unlock(&local->mtx); | |
1090 | return -EBUSY; | |
1091 | } | |
1092 | ||
1093 | ret = __ieee80211_request_sched_scan_start(sdata, req); | |
1094 | ||
5260a5b2 | 1095 | mutex_unlock(&local->mtx); |
79f460ca LC |
1096 | return ret; |
1097 | } | |
1098 | ||
85a9994a | 1099 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) |
79f460ca LC |
1100 | { |
1101 | struct ieee80211_local *local = sdata->local; | |
30dd3edf | 1102 | int ret = 0; |
79f460ca | 1103 | |
5260a5b2 | 1104 | mutex_lock(&local->mtx); |
79f460ca LC |
1105 | |
1106 | if (!local->ops->sched_scan_stop) { | |
1107 | ret = -ENOTSUPP; | |
1108 | goto out; | |
1109 | } | |
1110 | ||
d43c6b6e | 1111 | /* We don't want to restart sched scan anymore. */ |
6ea0a69c | 1112 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1113 | |
71228a1e | 1114 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
37e3308c | 1115 | ret = drv_sched_scan_stop(local, sdata); |
71228a1e | 1116 | if (!ret) |
ad053a96 | 1117 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
71228a1e | 1118 | } |
79f460ca | 1119 | out: |
5260a5b2 | 1120 | mutex_unlock(&local->mtx); |
79f460ca LC |
1121 | |
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1126 | { | |
1127 | struct ieee80211_local *local = hw_to_local(hw); | |
1128 | ||
1129 | trace_api_sched_scan_results(local); | |
1130 | ||
1131 | cfg80211_sched_scan_results(hw->wiphy); | |
1132 | } | |
1133 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1134 | ||
f6837ba8 | 1135 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
85a9994a | 1136 | { |
85a9994a LC |
1137 | mutex_lock(&local->mtx); |
1138 | ||
5260a5b2 | 1139 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1140 | mutex_unlock(&local->mtx); |
1141 | return; | |
1142 | } | |
1143 | ||
0c2bef46 | 1144 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
85a9994a | 1145 | |
d43c6b6e | 1146 | /* If sched scan was aborted by the driver. */ |
6ea0a69c | 1147 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1148 | |
85a9994a LC |
1149 | mutex_unlock(&local->mtx); |
1150 | ||
1151 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
1152 | } | |
1153 | ||
f6837ba8 JB |
1154 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1155 | { | |
1156 | struct ieee80211_local *local = | |
1157 | container_of(work, struct ieee80211_local, | |
1158 | sched_scan_stopped_work); | |
1159 | ||
1160 | ieee80211_sched_scan_end(local); | |
1161 | } | |
1162 | ||
79f460ca LC |
1163 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1164 | { | |
1165 | struct ieee80211_local *local = hw_to_local(hw); | |
1166 | ||
1167 | trace_api_sched_scan_stopped(local); | |
1168 | ||
18db594a | 1169 | schedule_work(&local->sched_scan_stopped_work); |
79f460ca LC |
1170 | } |
1171 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |