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> | |
74d803b6 | 9 | * Copyright 2013-2015 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> |
df13cce5 | 19 | #include <net/sch_generic.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
bc3b2d7f | 21 | #include <linux/export.h> |
0a51b27e | 22 | #include <net/mac80211.h> |
0a51b27e JB |
23 | |
24 | #include "ieee80211_i.h" | |
24487981 | 25 | #include "driver-ops.h" |
5484e237 | 26 | #include "mesh.h" |
0a51b27e JB |
27 | |
28 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
29 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
3f892b61 | 30 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) |
0a51b27e | 31 | |
5484e237 | 32 | void ieee80211_rx_bss_put(struct ieee80211_local *local, |
c2b13452 | 33 | struct ieee80211_bss *bss) |
5484e237 | 34 | { |
0c1ad2ca JB |
35 | if (!bss) |
36 | return; | |
5b112d3d JB |
37 | cfg80211_put_bss(local->hw.wiphy, |
38 | container_of((void *)bss, struct cfg80211_bss, priv)); | |
5484e237 JB |
39 | } |
40 | ||
ab13315a KV |
41 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
42 | { | |
43 | u8 qos_info; | |
44 | ||
45 | if (elems->wmm_info && elems->wmm_info_len == 7 | |
46 | && elems->wmm_info[5] == 1) | |
47 | qos_info = elems->wmm_info[6]; | |
48 | else if (elems->wmm_param && elems->wmm_param_len == 24 | |
49 | && elems->wmm_param[5] == 1) | |
50 | qos_info = elems->wmm_param[6]; | |
51 | else | |
52 | /* no valid wmm information or parameter element found */ | |
53 | return false; | |
54 | ||
55 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; | |
56 | } | |
57 | ||
c2b13452 | 58 | struct ieee80211_bss * |
5484e237 JB |
59 | ieee80211_bss_info_update(struct ieee80211_local *local, |
60 | struct ieee80211_rx_status *rx_status, | |
d45c4172 | 61 | struct ieee80211_mgmt *mgmt, size_t len, |
5484e237 | 62 | struct ieee802_11_elems *elems, |
d45c4172 | 63 | struct ieee80211_channel *channel) |
5484e237 | 64 | { |
d45c4172 | 65 | bool beacon = ieee80211_is_beacon(mgmt->frame_control); |
0c1ad2ca | 66 | struct cfg80211_bss *cbss; |
c2b13452 | 67 | struct ieee80211_bss *bss; |
f0b058b6 | 68 | int clen, srlen; |
162dd6a7 JB |
69 | struct cfg80211_inform_bss bss_meta = { |
70 | .boottime_ns = rx_status->boottime_ns, | |
71 | }; | |
74d803b6 | 72 | bool signal_valid; |
2a519311 | 73 | |
30686bf7 | 74 | if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) |
61f6bba0 | 75 | bss_meta.signal = rx_status->signal * 100; |
30686bf7 | 76 | else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) |
61f6bba0 | 77 | bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 78 | |
61f6bba0 | 79 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20; |
7ca15a0a | 80 | if (rx_status->flag & RX_FLAG_5MHZ) |
61f6bba0 | 81 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5; |
7ca15a0a | 82 | if (rx_status->flag & RX_FLAG_10MHZ) |
61f6bba0 | 83 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10; |
7ca15a0a | 84 | |
61f6bba0 JB |
85 | bss_meta.chan = channel; |
86 | cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, | |
87 | mgmt, len, GFP_ATOMIC); | |
0c1ad2ca | 88 | if (!cbss) |
00d3f14c | 89 | return NULL; |
74d803b6 SS |
90 | /* In case the signal is invalid update the status */ |
91 | signal_valid = abs(channel->center_freq - cbss->channel->center_freq) | |
92 | <= local->hw.wiphy->max_adj_channel_rssi_comp; | |
93 | if (!signal_valid) | |
94 | rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; | |
00d3f14c | 95 | |
0c1ad2ca | 96 | bss = (void *)cbss->priv; |
5484e237 | 97 | |
ef429dad JB |
98 | if (beacon) |
99 | bss->device_ts_beacon = rx_status->device_timestamp; | |
100 | else | |
101 | bss->device_ts_presp = rx_status->device_timestamp; | |
8c358bcd | 102 | |
fcff4f10 PS |
103 | if (elems->parse_error) { |
104 | if (beacon) | |
105 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
106 | else | |
107 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
108 | } else { | |
109 | if (beacon) | |
110 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
111 | else | |
112 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
113 | } | |
114 | ||
5484e237 | 115 | /* save the ERP value so that it is available at association time */ |
1946bed9 JB |
116 | if (elems->erp_info && (!elems->parse_error || |
117 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 118 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 119 | bss->has_erp_value = true; |
fcff4f10 PS |
120 | if (!elems->parse_error) |
121 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
122 | } |
123 | ||
f0b058b6 | 124 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
125 | if (!elems->parse_error || |
126 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
127 | srlen = 0; | |
128 | if (elems->supp_rates) { | |
129 | clen = IEEE80211_MAX_SUPP_RATES; | |
130 | if (clen > elems->supp_rates_len) | |
131 | clen = elems->supp_rates_len; | |
132 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
133 | srlen += clen; | |
134 | } | |
135 | if (elems->ext_supp_rates) { | |
136 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
137 | if (clen > elems->ext_supp_rates_len) | |
138 | clen = elems->ext_supp_rates_len; | |
139 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
140 | clen); | |
141 | srlen += clen; | |
142 | } | |
143 | if (srlen) { | |
144 | bss->supp_rates_len = srlen; | |
145 | if (!elems->parse_error) | |
146 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
147 | } | |
5484e237 | 148 | } |
5484e237 | 149 | |
fcff4f10 PS |
150 | if (!elems->parse_error || |
151 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
152 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
153 | bss->uapsd_supported = is_uapsd_supported(elems); | |
154 | if (!elems->parse_error) | |
155 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
156 | } | |
5484e237 | 157 | |
817cee76 AB |
158 | if (beacon) { |
159 | struct ieee80211_supported_band *sband = | |
160 | local->hw.wiphy->bands[rx_status->band]; | |
161 | if (!(rx_status->flag & RX_FLAG_HT) && | |
162 | !(rx_status->flag & RX_FLAG_VHT)) | |
163 | bss->beacon_rate = | |
164 | &sband->bitrates[rx_status->rate_idx]; | |
165 | } | |
166 | ||
5484e237 JB |
167 | return bss; |
168 | } | |
0a51b27e | 169 | |
d48b2968 | 170 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 171 | { |
f1d58c25 | 172 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
173 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
174 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 175 | struct ieee80211_bss *bss; |
98c8fccf JB |
176 | u8 *elements; |
177 | struct ieee80211_channel *channel; | |
178 | size_t baselen; | |
98c8fccf JB |
179 | struct ieee802_11_elems elems; |
180 | ||
d48b2968 JB |
181 | if (skb->len < 24 || |
182 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
183 | !ieee80211_is_beacon(mgmt->frame_control))) | |
184 | return; | |
98c8fccf | 185 | |
d48b2968 JB |
186 | sdata1 = rcu_dereference(local->scan_sdata); |
187 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 188 | |
d48b2968 JB |
189 | if (likely(!sdata1 && !sdata2)) |
190 | return; | |
98c8fccf | 191 | |
d48b2968 | 192 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
a344d677 JB |
193 | struct cfg80211_scan_request *scan_req; |
194 | struct cfg80211_sched_scan_request *sched_scan_req; | |
195 | ||
196 | scan_req = rcu_dereference(local->scan_req); | |
197 | sched_scan_req = rcu_dereference(local->sched_scan_req); | |
198 | ||
199 | /* ignore ProbeResp to foreign address unless scanning | |
200 | * with randomised address | |
201 | */ | |
202 | if (!(sdata1 && | |
203 | (ether_addr_equal(mgmt->da, sdata1->vif.addr) || | |
204 | scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)) && | |
205 | !(sdata2 && | |
206 | (ether_addr_equal(mgmt->da, sdata2->vif.addr) || | |
207 | sched_scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR))) | |
d48b2968 | 208 | return; |
98c8fccf | 209 | |
98c8fccf JB |
210 | elements = mgmt->u.probe_resp.variable; |
211 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
212 | } else { | |
98c8fccf JB |
213 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
214 | elements = mgmt->u.beacon.variable; | |
215 | } | |
216 | ||
98c8fccf | 217 | if (baselen > skb->len) |
d48b2968 | 218 | return; |
98c8fccf | 219 | |
b2e506bf | 220 | ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); |
98c8fccf | 221 | |
0172bb75 | 222 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
223 | |
224 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 225 | return; |
98c8fccf | 226 | |
d48b2968 | 227 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 228 | mgmt, skb->len, &elems, |
d45c4172 | 229 | channel); |
d048e503 | 230 | if (bss) |
d48b2968 | 231 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
232 | } |
233 | ||
2103dec1 SW |
234 | static void |
235 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, | |
236 | enum nl80211_bss_scan_width scan_width) | |
237 | { | |
238 | memset(chandef, 0, sizeof(*chandef)); | |
239 | switch (scan_width) { | |
240 | case NL80211_BSS_CHAN_WIDTH_5: | |
241 | chandef->width = NL80211_CHAN_WIDTH_5; | |
242 | break; | |
243 | case NL80211_BSS_CHAN_WIDTH_10: | |
244 | chandef->width = NL80211_CHAN_WIDTH_10; | |
245 | break; | |
246 | default: | |
247 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
248 | break; | |
249 | } | |
250 | } | |
251 | ||
4d36ec58 JB |
252 | /* return false if no more work */ |
253 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
254 | { | |
6ea0a69c | 255 | struct cfg80211_scan_request *req; |
2103dec1 | 256 | struct cfg80211_chan_def chandef; |
c56ef672 | 257 | u8 bands_used = 0; |
4d36ec58 JB |
258 | int i, ielen, n_chans; |
259 | ||
6ea0a69c JB |
260 | req = rcu_dereference_protected(local->scan_req, |
261 | lockdep_is_held(&local->mtx)); | |
262 | ||
a754055a EG |
263 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
264 | return false; | |
265 | ||
30686bf7 | 266 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
4d36ec58 | 267 | for (i = 0; i < req->n_channels; i++) { |
c56ef672 DS |
268 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
269 | bands_used |= BIT(req->channels[i]->band); | |
270 | } | |
271 | ||
272 | n_chans = req->n_channels; | |
273 | } else { | |
274 | do { | |
57fbcce3 | 275 | if (local->hw_scan_band == NUM_NL80211_BANDS) |
c56ef672 DS |
276 | return false; |
277 | ||
278 | n_chans = 0; | |
279 | ||
280 | for (i = 0; i < req->n_channels; i++) { | |
281 | if (req->channels[i]->band != | |
282 | local->hw_scan_band) | |
283 | continue; | |
284 | local->hw_scan_req->req.channels[n_chans] = | |
4d36ec58 JB |
285 | req->channels[i]; |
286 | n_chans++; | |
c56ef672 | 287 | bands_used |= BIT(req->channels[i]->band); |
4d36ec58 | 288 | } |
4d36ec58 | 289 | |
c56ef672 DS |
290 | local->hw_scan_band++; |
291 | } while (!n_chans); | |
292 | } | |
4d36ec58 | 293 | |
c56ef672 | 294 | local->hw_scan_req->req.n_channels = n_chans; |
2103dec1 | 295 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
4d36ec58 | 296 | |
c56ef672 DS |
297 | ielen = ieee80211_build_preq_ies(local, |
298 | (u8 *)local->hw_scan_req->req.ie, | |
c604b9f2 | 299 | local->hw_scan_ies_bufsize, |
c56ef672 DS |
300 | &local->hw_scan_req->ies, |
301 | req->ie, req->ie_len, | |
302 | bands_used, req->rates, &chandef); | |
303 | local->hw_scan_req->req.ie_len = ielen; | |
304 | local->hw_scan_req->req.no_cck = req->no_cck; | |
a344d677 JB |
305 | ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); |
306 | ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, | |
307 | req->mac_addr_mask); | |
e345f44f | 308 | ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); |
4d36ec58 JB |
309 | |
310 | return true; | |
311 | } | |
312 | ||
8bd2a248 | 313 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
314 | { |
315 | struct ieee80211_local *local = hw_to_local(hw); | |
8bd2a248 | 316 | bool hw_scan = local->ops->hw_scan; |
a2b70e83 | 317 | bool was_scanning = local->scanning; |
6ea0a69c | 318 | struct cfg80211_scan_request *scan_req; |
a344d677 | 319 | struct ieee80211_sub_if_data *scan_sdata; |
4fa11ec7 | 320 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 321 | |
e229f844 | 322 | lockdep_assert_held(&local->mtx); |
5bc75728 | 323 | |
6d3560d4 JB |
324 | /* |
325 | * It's ok to abort a not-yet-running scan (that | |
326 | * we have one at all will be verified by checking | |
327 | * local->scan_req next), but not to complete it | |
328 | * successfully. | |
329 | */ | |
330 | if (WARN_ON(!local->scanning && !aborted)) | |
331 | aborted = true; | |
5bc75728 | 332 | |
e229f844 | 333 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 334 | return; |
de95a54b | 335 | |
c56ef672 | 336 | if (hw_scan && !aborted && |
30686bf7 | 337 | !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && |
c56ef672 | 338 | ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
339 | int rc; |
340 | ||
341 | rc = drv_hw_scan(local, | |
342 | rcu_dereference_protected(local->scan_sdata, | |
343 | lockdep_is_held(&local->mtx)), | |
344 | local->hw_scan_req); | |
345 | ||
6eb11a9a | 346 | if (rc == 0) |
d07bfd8b | 347 | return; |
4d36ec58 JB |
348 | } |
349 | ||
350 | kfree(local->hw_scan_req); | |
351 | local->hw_scan_req = NULL; | |
f3b85252 | 352 | |
6ea0a69c JB |
353 | scan_req = rcu_dereference_protected(local->scan_req, |
354 | lockdep_is_held(&local->mtx)); | |
355 | ||
356 | if (scan_req != local->int_scan_req) | |
357 | cfg80211_scan_done(scan_req, aborted); | |
358 | RCU_INIT_POINTER(local->scan_req, NULL); | |
a344d677 JB |
359 | |
360 | scan_sdata = rcu_dereference_protected(local->scan_sdata, | |
361 | lockdep_is_held(&local->mtx)); | |
0c2bef46 | 362 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
2a519311 | 363 | |
fbe9c429 | 364 | local->scanning = 0; |
7ca15a0a | 365 | local->scan_chandef.chan = NULL; |
f3b85252 | 366 | |
07ef03ee JB |
367 | /* Set power back to normal operating levels. */ |
368 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 369 | |
8bd2a248 | 370 | if (!hw_scan) { |
e229f844 | 371 | ieee80211_configure_filter(local); |
a344d677 | 372 | drv_sw_scan_complete(local, scan_sdata); |
aacde9ee | 373 | ieee80211_offchannel_return(local); |
e229f844 | 374 | } |
0a51b27e | 375 | |
5cff20e6 | 376 | ieee80211_recalc_idle(local); |
e229f844 | 377 | |
0a51b27e | 378 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 379 | ieee80211_ibss_notify_scan_completed(local); |
4fa11ec7 SK |
380 | |
381 | /* Requeue all the work that might have been ignored while | |
382 | * the scan was in progress; if there was none this will | |
383 | * just be a no-op for the particular interface. | |
384 | */ | |
385 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
386 | if (ieee80211_sdata_running(sdata)) | |
387 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); | |
388 | } | |
389 | ||
a2b70e83 EP |
390 | if (was_scanning) |
391 | ieee80211_start_next_roc(local); | |
0a51b27e | 392 | } |
8789d459 JB |
393 | |
394 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
395 | { | |
396 | struct ieee80211_local *local = hw_to_local(hw); | |
397 | ||
398 | trace_api_scan_completed(local, aborted); | |
399 | ||
400 | set_bit(SCAN_COMPLETED, &local->scanning); | |
401 | if (aborted) | |
402 | set_bit(SCAN_ABORTED, &local->scanning); | |
403 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
404 | } | |
0a51b27e JB |
405 | EXPORT_SYMBOL(ieee80211_scan_completed); |
406 | ||
a344d677 JB |
407 | static int ieee80211_start_sw_scan(struct ieee80211_local *local, |
408 | struct ieee80211_sub_if_data *sdata) | |
f3b85252 | 409 | { |
fe57d9f5 JB |
410 | /* Software scan is not supported in multi-channel cases */ |
411 | if (local->use_chanctx) | |
412 | return -EOPNOTSUPP; | |
413 | ||
f3b85252 JB |
414 | /* |
415 | * Hardware/driver doesn't support hw_scan, so use software | |
416 | * scanning instead. First send a nullfunc frame with power save | |
417 | * bit on so that AP will buffer the frames for us while we are not | |
418 | * listening, then send probe requests to each channel and wait for | |
419 | * the responses. After all channels are scanned, tune back to the | |
420 | * original channel and send a nullfunc frame with power save bit | |
421 | * off to trigger the AP to send us all the buffered frames. | |
422 | * | |
423 | * Note that while local->sw_scanning is true everything else but | |
424 | * nullfunc frames and probe requests will be dropped in | |
425 | * ieee80211_tx_h_check_assoc(). | |
426 | */ | |
a344d677 | 427 | drv_sw_scan_start(local, sdata, local->scan_addr); |
f3b85252 | 428 | |
de312db3 | 429 | local->leave_oper_channel_time = jiffies; |
977923b0 | 430 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
431 | local->scan_channel_idx = 0; |
432 | ||
aacde9ee | 433 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 434 | |
9c35d7d2 | 435 | /* ensure nullfunc is transmitted before leaving operating channel */ |
3b24f4c6 | 436 | ieee80211_flush_queues(local, NULL, false); |
9c35d7d2 | 437 | |
3ac64bee | 438 | ieee80211_configure_filter(local); |
f3b85252 | 439 | |
59bdf3b0 BG |
440 | /* We need to set power level at maximum rate for scanning. */ |
441 | ieee80211_hw_config(local, 0); | |
442 | ||
42935eca | 443 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 444 | &local->scan_work, 0); |
f3b85252 JB |
445 | |
446 | return 0; | |
447 | } | |
448 | ||
133d40f9 SG |
449 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
450 | struct ieee80211_sub_if_data *sdata) | |
451 | { | |
5cbc95a7 | 452 | if (ieee80211_is_radar_required(local)) |
164eb02d SW |
453 | return false; |
454 | ||
2eb278e0 | 455 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
456 | return false; |
457 | ||
458 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
392b9ffb | 459 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
133d40f9 SG |
460 | return false; |
461 | ||
462 | return true; | |
463 | } | |
464 | ||
465 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
466 | { | |
467 | lockdep_assert_held(&local->mtx); | |
468 | ||
469 | if (!local->scan_req || local->scanning) | |
470 | return; | |
471 | ||
e2fd5dbc JB |
472 | if (!ieee80211_can_scan(local, |
473 | rcu_dereference_protected( | |
474 | local->scan_sdata, | |
475 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
476 | return; |
477 | ||
478 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
479 | round_jiffies_relative(0)); | |
480 | } | |
f3b85252 | 481 | |
8a690674 BG |
482 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
483 | unsigned long *next_delay) | |
484 | { | |
485 | int i; | |
e2fd5dbc | 486 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 487 | struct cfg80211_scan_request *scan_req; |
57fbcce3 | 488 | enum nl80211_band band = local->hw.conf.chandef.chan->band; |
6c17b77b SF |
489 | u32 tx_flags; |
490 | ||
6ea0a69c JB |
491 | scan_req = rcu_dereference_protected(local->scan_req, |
492 | lockdep_is_held(&local->mtx)); | |
493 | ||
6c17b77b | 494 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
6ea0a69c | 495 | if (scan_req->no_cck) |
6c17b77b | 496 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
8a690674 | 497 | |
e2fd5dbc | 498 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 499 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 500 | |
6ea0a69c | 501 | for (i = 0; i < scan_req->n_ssids; i++) |
8a690674 | 502 | ieee80211_send_probe_req( |
e345f44f | 503 | sdata, local->scan_addr, scan_req->bssid, |
6ea0a69c JB |
504 | scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, |
505 | scan_req->ie, scan_req->ie_len, | |
506 | scan_req->rates[band], false, | |
675a0b04 | 507 | tx_flags, local->hw.conf.chandef.chan, true); |
8a690674 BG |
508 | |
509 | /* | |
510 | * After sending probe requests, wait for probe responses | |
511 | * on the channel. | |
512 | */ | |
513 | *next_delay = IEEE80211_CHANNEL_TIME; | |
514 | local->next_scan_state = SCAN_DECISION; | |
515 | } | |
516 | ||
f3b85252 JB |
517 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
518 | struct cfg80211_scan_request *req) | |
519 | { | |
520 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
521 | int rc; |
522 | ||
e229f844 SG |
523 | lockdep_assert_held(&local->mtx); |
524 | ||
2726f23d | 525 | if (local->scan_req || ieee80211_is_radar_required(local)) |
f3b85252 JB |
526 | return -EBUSY; |
527 | ||
133d40f9 | 528 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 529 | /* wait for the work to finish/time out */ |
6ea0a69c | 530 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 531 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
532 | return 0; |
533 | } | |
534 | ||
f3b85252 JB |
535 | if (local->ops->hw_scan) { |
536 | u8 *ies; | |
f3b85252 | 537 | |
e4dcbb37 | 538 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
c56ef672 | 539 | |
30686bf7 | 540 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
c56ef672 DS |
541 | int i, n_bands = 0; |
542 | u8 bands_counted = 0; | |
543 | ||
544 | for (i = 0; i < req->n_channels; i++) { | |
545 | if (bands_counted & BIT(req->channels[i]->band)) | |
546 | continue; | |
547 | bands_counted |= BIT(req->channels[i]->band); | |
548 | n_bands++; | |
549 | } | |
550 | ||
551 | local->hw_scan_ies_bufsize *= n_bands; | |
552 | } | |
553 | ||
4d36ec58 JB |
554 | local->hw_scan_req = kmalloc( |
555 | sizeof(*local->hw_scan_req) + | |
556 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 557 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 558 | if (!local->hw_scan_req) |
f3b85252 JB |
559 | return -ENOMEM; |
560 | ||
c56ef672 DS |
561 | local->hw_scan_req->req.ssids = req->ssids; |
562 | local->hw_scan_req->req.n_ssids = req->n_ssids; | |
4d36ec58 JB |
563 | ies = (u8 *)local->hw_scan_req + |
564 | sizeof(*local->hw_scan_req) + | |
565 | req->n_channels * sizeof(req->channels[0]); | |
c56ef672 DS |
566 | local->hw_scan_req->req.ie = ies; |
567 | local->hw_scan_req->req.flags = req->flags; | |
e345f44f | 568 | eth_broadcast_addr(local->hw_scan_req->req.bssid); |
4d36ec58 JB |
569 | |
570 | local->hw_scan_band = 0; | |
6e7e6213 JL |
571 | |
572 | /* | |
573 | * After allocating local->hw_scan_req, we must | |
574 | * go through until ieee80211_prep_hw_scan(), so | |
575 | * anything that might be changed here and leave | |
576 | * this function early must not go after this | |
577 | * allocation. | |
578 | */ | |
f3b85252 JB |
579 | } |
580 | ||
6ea0a69c | 581 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 582 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 583 | |
a344d677 JB |
584 | if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
585 | get_random_mask_addr(local->scan_addr, | |
586 | req->mac_addr, | |
587 | req->mac_addr_mask); | |
588 | else | |
589 | memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); | |
590 | ||
8a690674 | 591 | if (local->ops->hw_scan) { |
fbe9c429 | 592 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 593 | } else if ((req->n_channels == 1) && |
675a0b04 | 594 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
595 | /* |
596 | * If we are scanning only on the operating channel | |
597 | * then we do not need to stop normal activities | |
8a690674 BG |
598 | */ |
599 | unsigned long next_delay; | |
600 | ||
601 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
602 | ||
603 | ieee80211_recalc_idle(local); | |
604 | ||
605 | /* Notify driver scan is starting, keep order of operations | |
606 | * same as normal software scan, in case that matters. */ | |
a344d677 | 607 | drv_sw_scan_start(local, sdata, local->scan_addr); |
8a690674 BG |
608 | |
609 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
610 | ||
611 | /* We need to ensure power level is at max for scanning. */ | |
612 | ieee80211_hw_config(local, 0); | |
613 | ||
4e39ccac AQ |
614 | if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | |
615 | IEEE80211_CHAN_RADAR)) || | |
6ea0a69c | 616 | !req->n_ssids) { |
8a690674 BG |
617 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
618 | } else { | |
619 | ieee80211_scan_state_send_probe(local, &next_delay); | |
620 | next_delay = IEEE80211_CHANNEL_TIME; | |
621 | } | |
622 | ||
623 | /* Now, just wait a bit and we are all done! */ | |
624 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
625 | next_delay); | |
626 | return 0; | |
627 | } else { | |
628 | /* Do normal software scan */ | |
fbe9c429 | 629 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 630 | } |
6e7e6213 | 631 | |
5cff20e6 | 632 | ieee80211_recalc_idle(local); |
f3b85252 | 633 | |
4d36ec58 JB |
634 | if (local->ops->hw_scan) { |
635 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 636 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
a344d677 JB |
637 | } else { |
638 | rc = ieee80211_start_sw_scan(local, sdata); | |
639 | } | |
f3b85252 | 640 | |
f3b85252 | 641 | if (rc) { |
4d36ec58 JB |
642 | kfree(local->hw_scan_req); |
643 | local->hw_scan_req = NULL; | |
fbe9c429 | 644 | local->scanning = 0; |
f3b85252 | 645 | |
5cff20e6 JB |
646 | ieee80211_recalc_idle(local); |
647 | ||
f3b85252 | 648 | local->scan_req = NULL; |
0c2bef46 | 649 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 JB |
650 | } |
651 | ||
652 | return rc; | |
653 | } | |
654 | ||
df13cce5 HS |
655 | static unsigned long |
656 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
657 | { | |
658 | /* | |
659 | * TODO: channel switching also consumes quite some time, | |
660 | * add that delay as well to get a better estimation | |
661 | */ | |
4e39ccac | 662 | if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) |
df13cce5 HS |
663 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
664 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
665 | } | |
666 | ||
e229f844 SG |
667 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
668 | unsigned long *next_delay) | |
7d3be3cc | 669 | { |
142b9f50 | 670 | bool associated = false; |
df13cce5 HS |
671 | bool tx_empty = true; |
672 | bool bad_latency; | |
142b9f50 | 673 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 674 | struct ieee80211_channel *next_chan; |
cd2bb512 | 675 | enum mac80211_scan_state next_scan_state; |
6ea0a69c | 676 | struct cfg80211_scan_request *scan_req; |
142b9f50 | 677 | |
df13cce5 HS |
678 | /* |
679 | * check if at least one STA interface is associated, | |
680 | * check if at least one STA interface has pending tx frames | |
681 | * and grab the lowest used beacon interval | |
682 | */ | |
142b9f50 HS |
683 | mutex_lock(&local->iflist_mtx); |
684 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 685 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
686 | continue; |
687 | ||
688 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
689 | if (sdata->u.mgd.associated) { | |
690 | associated = true; | |
df13cce5 | 691 | |
df13cce5 HS |
692 | if (!qdisc_all_tx_empty(sdata->dev)) { |
693 | tx_empty = false; | |
694 | break; | |
695 | } | |
142b9f50 HS |
696 | } |
697 | } | |
698 | } | |
699 | mutex_unlock(&local->iflist_mtx); | |
700 | ||
6ea0a69c JB |
701 | scan_req = rcu_dereference_protected(local->scan_req, |
702 | lockdep_is_held(&local->mtx)); | |
703 | ||
704 | next_chan = scan_req->channels[local->scan_channel_idx]; | |
b23b025f | 705 | |
a80f7c0b | 706 | /* |
07ef03ee JB |
707 | * we're currently scanning a different channel, let's |
708 | * see if we can scan another channel without interfering | |
709 | * with the current traffic situation. | |
710 | * | |
3f892b61 | 711 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 712 | */ |
a80f7c0b | 713 | |
07ef03ee | 714 | bad_latency = time_after(jiffies + |
3f892b61 SG |
715 | ieee80211_scan_get_channel_time(next_chan), |
716 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 717 | |
cd2bb512 | 718 | if (associated && !tx_empty) { |
6ea0a69c | 719 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
cd2bb512 SL |
720 | next_scan_state = SCAN_ABORT; |
721 | else | |
722 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 723 | } else if (associated && bad_latency) { |
cd2bb512 SL |
724 | next_scan_state = SCAN_SUSPEND; |
725 | } else { | |
726 | next_scan_state = SCAN_SET_CHANNEL; | |
727 | } | |
728 | ||
729 | local->next_scan_state = next_scan_state; | |
142b9f50 | 730 | |
07ef03ee | 731 | *next_delay = 0; |
142b9f50 HS |
732 | } |
733 | ||
2fb3f028 HS |
734 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
735 | unsigned long *next_delay) | |
736 | { | |
737 | int skip; | |
738 | struct ieee80211_channel *chan; | |
7ca15a0a | 739 | enum nl80211_bss_scan_width oper_scan_width; |
6ea0a69c JB |
740 | struct cfg80211_scan_request *scan_req; |
741 | ||
742 | scan_req = rcu_dereference_protected(local->scan_req, | |
743 | lockdep_is_held(&local->mtx)); | |
2fb3f028 | 744 | |
7d3be3cc | 745 | skip = 0; |
6ea0a69c | 746 | chan = scan_req->channels[local->scan_channel_idx]; |
7d3be3cc | 747 | |
7ca15a0a SW |
748 | local->scan_chandef.chan = chan; |
749 | local->scan_chandef.center_freq1 = chan->center_freq; | |
750 | local->scan_chandef.center_freq2 = 0; | |
6ea0a69c | 751 | switch (scan_req->scan_width) { |
7ca15a0a SW |
752 | case NL80211_BSS_CHAN_WIDTH_5: |
753 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; | |
754 | break; | |
755 | case NL80211_BSS_CHAN_WIDTH_10: | |
756 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; | |
757 | break; | |
758 | case NL80211_BSS_CHAN_WIDTH_20: | |
759 | /* If scanning on oper channel, use whatever channel-type | |
760 | * is currently in use. | |
761 | */ | |
762 | oper_scan_width = cfg80211_chandef_to_scan_width( | |
763 | &local->_oper_chandef); | |
764 | if (chan == local->_oper_chandef.chan && | |
6ea0a69c | 765 | oper_scan_width == scan_req->scan_width) |
7ca15a0a SW |
766 | local->scan_chandef = local->_oper_chandef; |
767 | else | |
768 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; | |
769 | break; | |
770 | } | |
b23b025f | 771 | |
07ef03ee JB |
772 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
773 | skip = 1; | |
7d3be3cc | 774 | |
7d3be3cc HS |
775 | /* advance state machine to next channel/band */ |
776 | local->scan_channel_idx++; | |
777 | ||
0ee9c13c HS |
778 | if (skip) { |
779 | /* if we skip this channel return to the decision state */ | |
780 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 781 | return; |
0ee9c13c | 782 | } |
7d3be3cc HS |
783 | |
784 | /* | |
785 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
786 | * (which unfortunately doesn't say _why_ step a) is done, | |
787 | * but it waits for the probe delay or until a frame is | |
788 | * received - and the received frame would update the NAV). | |
789 | * For now, we do not support waiting until a frame is | |
790 | * received. | |
791 | * | |
792 | * In any case, it is not necessary for a passive scan. | |
793 | */ | |
4e39ccac AQ |
794 | if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || |
795 | !scan_req->n_ssids) { | |
7d3be3cc | 796 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
977923b0 | 797 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 798 | return; |
7d3be3cc HS |
799 | } |
800 | ||
2fb3f028 | 801 | /* active scan, send probes */ |
7d3be3cc | 802 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 803 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
804 | } |
805 | ||
07ef03ee JB |
806 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
807 | unsigned long *next_delay) | |
808 | { | |
809 | /* switch back to the operating channel */ | |
7ca15a0a | 810 | local->scan_chandef.chan = NULL; |
07ef03ee JB |
811 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
812 | ||
aacde9ee SG |
813 | /* disable PS */ |
814 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
815 | |
816 | *next_delay = HZ / 5; | |
817 | /* afterwards, resume scan & go to next channel */ | |
818 | local->next_scan_state = SCAN_RESUME; | |
819 | } | |
820 | ||
821 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
822 | unsigned long *next_delay) | |
823 | { | |
aacde9ee | 824 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
825 | |
826 | if (local->ops->flush) { | |
3b24f4c6 | 827 | ieee80211_flush_queues(local, NULL, false); |
07ef03ee JB |
828 | *next_delay = 0; |
829 | } else | |
830 | *next_delay = HZ / 10; | |
831 | ||
832 | /* remember when we left the operating channel */ | |
833 | local->leave_oper_channel_time = jiffies; | |
834 | ||
835 | /* advance to the next channel to be scanned */ | |
de2ee84d | 836 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
837 | } |
838 | ||
c2b13452 | 839 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
840 | { |
841 | struct ieee80211_local *local = | |
842 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 843 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 844 | struct cfg80211_scan_request *scan_req; |
0a51b27e | 845 | unsigned long next_delay = 0; |
8bd2a248 | 846 | bool aborted; |
0a51b27e | 847 | |
259b62e3 | 848 | mutex_lock(&local->mtx); |
8789d459 | 849 | |
332ff7fe LC |
850 | if (!ieee80211_can_run_worker(local)) { |
851 | aborted = true; | |
852 | goto out_complete; | |
853 | } | |
854 | ||
e2fd5dbc JB |
855 | sdata = rcu_dereference_protected(local->scan_sdata, |
856 | lockdep_is_held(&local->mtx)); | |
6ea0a69c JB |
857 | scan_req = rcu_dereference_protected(local->scan_req, |
858 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 859 | |
8a690674 BG |
860 | /* When scanning on-channel, the first-callback means completed. */ |
861 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
862 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
863 | goto out_complete; | |
864 | } | |
865 | ||
259b62e3 | 866 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 867 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 868 | goto out_complete; |
8789d459 JB |
869 | } |
870 | ||
6ea0a69c | 871 | if (!sdata || !scan_req) |
259b62e3 | 872 | goto out; |
f3b85252 | 873 | |
ff5db439 | 874 | if (!local->scanning) { |
f3b85252 JB |
875 | int rc; |
876 | ||
6ea0a69c | 877 | RCU_INIT_POINTER(local->scan_req, NULL); |
0c2bef46 | 878 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 | 879 | |
6ea0a69c | 880 | rc = __ieee80211_start_scan(sdata, scan_req); |
259b62e3 | 881 | if (rc) { |
3aed49ef | 882 | /* need to complete scan in cfg80211 */ |
6ea0a69c | 883 | rcu_assign_pointer(local->scan_req, scan_req); |
259b62e3 SG |
884 | aborted = true; |
885 | goto out_complete; | |
886 | } else | |
887 | goto out; | |
f3b85252 JB |
888 | } |
889 | ||
f502d09b HS |
890 | /* |
891 | * as long as no delay is required advance immediately | |
892 | * without scheduling a new work | |
893 | */ | |
894 | do { | |
c29acf20 RM |
895 | if (!ieee80211_sdata_running(sdata)) { |
896 | aborted = true; | |
897 | goto out_complete; | |
898 | } | |
899 | ||
977923b0 | 900 | switch (local->next_scan_state) { |
2fb3f028 | 901 | case SCAN_DECISION: |
e229f844 | 902 | /* if no more bands/channels left, complete scan */ |
6ea0a69c | 903 | if (local->scan_channel_idx >= scan_req->n_channels) { |
e229f844 SG |
904 | aborted = false; |
905 | goto out_complete; | |
906 | } | |
907 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 908 | break; |
2fb3f028 HS |
909 | case SCAN_SET_CHANNEL: |
910 | ieee80211_scan_state_set_channel(local, &next_delay); | |
911 | break; | |
f502d09b HS |
912 | case SCAN_SEND_PROBE: |
913 | ieee80211_scan_state_send_probe(local, &next_delay); | |
914 | break; | |
07ef03ee JB |
915 | case SCAN_SUSPEND: |
916 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 917 | break; |
07ef03ee JB |
918 | case SCAN_RESUME: |
919 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 920 | break; |
cd2bb512 SL |
921 | case SCAN_ABORT: |
922 | aborted = true; | |
923 | goto out_complete; | |
f502d09b HS |
924 | } |
925 | } while (next_delay == 0); | |
0a51b27e | 926 | |
42935eca | 927 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 928 | goto out; |
259b62e3 SG |
929 | |
930 | out_complete: | |
8bd2a248 | 931 | __ieee80211_scan_completed(&local->hw, aborted); |
259b62e3 SG |
932 | out: |
933 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
934 | } |
935 | ||
f3b85252 JB |
936 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
937 | struct cfg80211_scan_request *req) | |
0a51b27e | 938 | { |
f3b85252 | 939 | int res; |
de95a54b | 940 | |
a1699b75 | 941 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 942 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 943 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 944 | |
f3b85252 | 945 | return res; |
0a51b27e JB |
946 | } |
947 | ||
34bcf715 SG |
948 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
949 | const u8 *ssid, u8 ssid_len, | |
76bed0f4 JD |
950 | struct ieee80211_channel **channels, |
951 | unsigned int n_channels, | |
7ca15a0a | 952 | enum nl80211_bss_scan_width scan_width) |
0a51b27e | 953 | { |
0a51b27e | 954 | struct ieee80211_local *local = sdata->local; |
76bed0f4 | 955 | int ret = -EBUSY, i, n_ch = 0; |
57fbcce3 | 956 | enum nl80211_band band; |
2a519311 | 957 | |
a1699b75 | 958 | mutex_lock(&local->mtx); |
0a51b27e | 959 | |
f3b85252 JB |
960 | /* busy scanning */ |
961 | if (local->scan_req) | |
962 | goto unlock; | |
9116dd01 | 963 | |
be4a4b6a | 964 | /* fill internal scan request */ |
76bed0f4 JD |
965 | if (!channels) { |
966 | int max_n; | |
be4a4b6a | 967 | |
57fbcce3 | 968 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
be4a4b6a JB |
969 | if (!local->hw.wiphy->bands[band]) |
970 | continue; | |
34bcf715 SG |
971 | |
972 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
973 | for (i = 0; i < max_n; i++) { | |
974 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 975 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 | 976 | |
8fe02e16 | 977 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
978 | IEEE80211_CHAN_DISABLED)) |
979 | continue; | |
980 | ||
981 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
982 | n_ch++; | |
be4a4b6a JB |
983 | } |
984 | } | |
985 | ||
34bcf715 SG |
986 | if (WARN_ON_ONCE(n_ch == 0)) |
987 | goto unlock; | |
988 | ||
989 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 990 | } else { |
76bed0f4 JD |
991 | for (i = 0; i < n_channels; i++) { |
992 | if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | | |
993 | IEEE80211_CHAN_DISABLED)) | |
994 | continue; | |
995 | ||
996 | local->int_scan_req->channels[n_ch] = channels[i]; | |
997 | n_ch++; | |
998 | } | |
999 | ||
1000 | if (WARN_ON_ONCE(n_ch == 0)) | |
34bcf715 SG |
1001 | goto unlock; |
1002 | ||
76bed0f4 | 1003 | local->int_scan_req->n_channels = n_ch; |
be4a4b6a JB |
1004 | } |
1005 | ||
1006 | local->int_scan_req->ssids = &local->scan_ssid; | |
1007 | local->int_scan_req->n_ssids = 1; | |
7ca15a0a | 1008 | local->int_scan_req->scan_width = scan_width; |
5ba63533 JB |
1009 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
1010 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 1011 | |
5ba63533 | 1012 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 1013 | unlock: |
a1699b75 | 1014 | mutex_unlock(&local->mtx); |
f3b85252 | 1015 | return ret; |
0a51b27e | 1016 | } |
5bb644a0 | 1017 | |
4136c422 SG |
1018 | /* |
1019 | * Only call this function when a scan can't be queued -- under RTNL. | |
1020 | */ | |
5bb644a0 JB |
1021 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
1022 | { | |
5bb644a0 | 1023 | /* |
b856439b | 1024 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
1025 | * yet really started (see __ieee80211_start_scan ). |
1026 | * | |
1027 | * Regarding hardware scan: | |
1028 | * - we can not call __ieee80211_scan_completed() as when | |
1029 | * SCAN_HW_SCANNING bit is set this function change | |
1030 | * local->hw_scan_req to operate on 5G band, what race with | |
1031 | * driver which can use local->hw_scan_req | |
1032 | * | |
1033 | * - we can not cancel scan_work since driver can schedule it | |
1034 | * by ieee80211_scan_completed(..., true) to finish scan | |
1035 | * | |
b856439b EP |
1036 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
1037 | * driver is still responsible for calling ieee80211_scan_completed() | |
1038 | * after the scan was completed/aborted. | |
5bb644a0 | 1039 | */ |
4136c422 | 1040 | |
a1699b75 | 1041 | mutex_lock(&local->mtx); |
b856439b EP |
1042 | if (!local->scan_req) |
1043 | goto out; | |
1044 | ||
a754055a EG |
1045 | /* |
1046 | * We have a scan running and the driver already reported completion, | |
1047 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
1048 | * cancelled. | |
1049 | */ | |
1050 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
1051 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
1052 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
1053 | goto out; | |
1054 | } | |
1055 | ||
b856439b | 1056 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
a754055a EG |
1057 | /* |
1058 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
1059 | * scan on another band. | |
1060 | */ | |
1061 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 1062 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
1063 | drv_cancel_hw_scan(local, |
1064 | rcu_dereference_protected(local->scan_sdata, | |
1065 | lockdep_is_held(&local->mtx))); | |
b856439b | 1066 | goto out; |
4136c422 | 1067 | } |
b856439b EP |
1068 | |
1069 | /* | |
1070 | * If the work is currently running, it must be blocked on | |
1071 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
1072 | * simply exit once it acquires the mutex. | |
1073 | */ | |
1074 | cancel_delayed_work(&local->scan_work); | |
1075 | /* and clean up */ | |
8bd2a248 | 1076 | __ieee80211_scan_completed(&local->hw, true); |
b856439b | 1077 | out: |
d07bfd8b | 1078 | mutex_unlock(&local->mtx); |
5bb644a0 | 1079 | } |
79f460ca | 1080 | |
d43c6b6e DS |
1081 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1082 | struct cfg80211_sched_scan_request *req) | |
79f460ca LC |
1083 | { |
1084 | struct ieee80211_local *local = sdata->local; | |
633e2713 | 1085 | struct ieee80211_scan_ies sched_scan_ies = {}; |
2103dec1 | 1086 | struct cfg80211_chan_def chandef; |
633e2713 | 1087 | int ret, i, iebufsz, num_bands = 0; |
57fbcce3 | 1088 | u32 rate_masks[NUM_NL80211_BANDS] = {}; |
633e2713 DS |
1089 | u8 bands_used = 0; |
1090 | u8 *ie; | |
1091 | size_t len; | |
c604b9f2 | 1092 | |
e4dcbb37 | 1093 | iebufsz = local->scan_ies_len + req->ie_len; |
79f460ca | 1094 | |
d43c6b6e | 1095 | lockdep_assert_held(&local->mtx); |
79f460ca | 1096 | |
d43c6b6e DS |
1097 | if (!local->ops->sched_scan_start) |
1098 | return -ENOTSUPP; | |
79f460ca | 1099 | |
57fbcce3 | 1100 | for (i = 0; i < NUM_NL80211_BANDS; i++) { |
633e2713 DS |
1101 | if (local->hw.wiphy->bands[i]) { |
1102 | bands_used |= BIT(i); | |
1103 | rate_masks[i] = (u32) -1; | |
1104 | num_bands++; | |
79f460ca | 1105 | } |
633e2713 | 1106 | } |
79f460ca | 1107 | |
633e2713 DS |
1108 | ie = kzalloc(num_bands * iebufsz, GFP_KERNEL); |
1109 | if (!ie) { | |
1110 | ret = -ENOMEM; | |
1111 | goto out; | |
79f460ca LC |
1112 | } |
1113 | ||
633e2713 DS |
1114 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
1115 | ||
1116 | len = ieee80211_build_preq_ies(local, ie, num_bands * iebufsz, | |
1117 | &sched_scan_ies, req->ie, | |
1118 | req->ie_len, bands_used, | |
1119 | rate_masks, &chandef); | |
1120 | ||
30dd3edf | 1121 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
d43c6b6e | 1122 | if (ret == 0) { |
5260a5b2 | 1123 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
6ea0a69c | 1124 | rcu_assign_pointer(local->sched_scan_req, req); |
d43c6b6e | 1125 | } |
79f460ca | 1126 | |
633e2713 | 1127 | kfree(ie); |
d43c6b6e | 1128 | |
633e2713 | 1129 | out: |
d43c6b6e DS |
1130 | if (ret) { |
1131 | /* Clean in case of failure after HW restart or upon resume. */ | |
0c2bef46 | 1132 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
6ea0a69c | 1133 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e DS |
1134 | } |
1135 | ||
1136 | return ret; | |
1137 | } | |
1138 | ||
1139 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
1140 | struct cfg80211_sched_scan_request *req) | |
1141 | { | |
1142 | struct ieee80211_local *local = sdata->local; | |
1143 | int ret; | |
1144 | ||
1145 | mutex_lock(&local->mtx); | |
1146 | ||
1147 | if (rcu_access_pointer(local->sched_scan_sdata)) { | |
1148 | mutex_unlock(&local->mtx); | |
1149 | return -EBUSY; | |
1150 | } | |
1151 | ||
1152 | ret = __ieee80211_request_sched_scan_start(sdata, req); | |
1153 | ||
5260a5b2 | 1154 | mutex_unlock(&local->mtx); |
79f460ca LC |
1155 | return ret; |
1156 | } | |
1157 | ||
0d440ea2 | 1158 | int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) |
79f460ca | 1159 | { |
0d440ea2 EP |
1160 | struct ieee80211_sub_if_data *sched_scan_sdata; |
1161 | int ret = -ENOENT; | |
79f460ca | 1162 | |
5260a5b2 | 1163 | mutex_lock(&local->mtx); |
79f460ca LC |
1164 | |
1165 | if (!local->ops->sched_scan_stop) { | |
1166 | ret = -ENOTSUPP; | |
1167 | goto out; | |
1168 | } | |
1169 | ||
d43c6b6e | 1170 | /* We don't want to restart sched scan anymore. */ |
6ea0a69c | 1171 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1172 | |
0d440ea2 EP |
1173 | sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, |
1174 | lockdep_is_held(&local->mtx)); | |
1175 | if (sched_scan_sdata) { | |
1176 | ret = drv_sched_scan_stop(local, sched_scan_sdata); | |
71228a1e | 1177 | if (!ret) |
ad053a96 | 1178 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
71228a1e | 1179 | } |
79f460ca | 1180 | out: |
5260a5b2 | 1181 | mutex_unlock(&local->mtx); |
79f460ca LC |
1182 | |
1183 | return ret; | |
1184 | } | |
1185 | ||
1186 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1187 | { | |
1188 | struct ieee80211_local *local = hw_to_local(hw); | |
1189 | ||
1190 | trace_api_sched_scan_results(local); | |
1191 | ||
1192 | cfg80211_sched_scan_results(hw->wiphy); | |
1193 | } | |
1194 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1195 | ||
f6837ba8 | 1196 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
85a9994a | 1197 | { |
85a9994a LC |
1198 | mutex_lock(&local->mtx); |
1199 | ||
5260a5b2 | 1200 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1201 | mutex_unlock(&local->mtx); |
1202 | return; | |
1203 | } | |
1204 | ||
0c2bef46 | 1205 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
85a9994a | 1206 | |
d43c6b6e | 1207 | /* If sched scan was aborted by the driver. */ |
6ea0a69c | 1208 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1209 | |
85a9994a LC |
1210 | mutex_unlock(&local->mtx); |
1211 | ||
1212 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
1213 | } | |
1214 | ||
f6837ba8 JB |
1215 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1216 | { | |
1217 | struct ieee80211_local *local = | |
1218 | container_of(work, struct ieee80211_local, | |
1219 | sched_scan_stopped_work); | |
1220 | ||
1221 | ieee80211_sched_scan_end(local); | |
1222 | } | |
1223 | ||
79f460ca LC |
1224 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1225 | { | |
1226 | struct ieee80211_local *local = hw_to_local(hw); | |
1227 | ||
1228 | trace_api_sched_scan_stopped(local); | |
1229 | ||
2bc533bd EP |
1230 | /* |
1231 | * this shouldn't really happen, so for simplicity | |
1232 | * simply ignore it, and let mac80211 reconfigure | |
1233 | * the sched scan later on. | |
1234 | */ | |
1235 | if (local->in_reconfig) | |
1236 | return; | |
1237 | ||
18db594a | 1238 | schedule_work(&local->sched_scan_stopped_work); |
79f460ca LC |
1239 | } |
1240 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |