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; |
61f6bba0 | 69 | struct cfg80211_inform_bss bss_meta = {}; |
74d803b6 | 70 | bool signal_valid; |
2a519311 | 71 | |
30686bf7 | 72 | if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) |
61f6bba0 | 73 | bss_meta.signal = rx_status->signal * 100; |
30686bf7 | 74 | else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) |
61f6bba0 | 75 | bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 76 | |
61f6bba0 | 77 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20; |
7ca15a0a | 78 | if (rx_status->flag & RX_FLAG_5MHZ) |
61f6bba0 | 79 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5; |
7ca15a0a | 80 | if (rx_status->flag & RX_FLAG_10MHZ) |
61f6bba0 | 81 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10; |
7ca15a0a | 82 | |
61f6bba0 JB |
83 | bss_meta.chan = channel; |
84 | cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, | |
85 | mgmt, len, GFP_ATOMIC); | |
0c1ad2ca | 86 | if (!cbss) |
00d3f14c | 87 | return NULL; |
74d803b6 SS |
88 | /* In case the signal is invalid update the status */ |
89 | signal_valid = abs(channel->center_freq - cbss->channel->center_freq) | |
90 | <= local->hw.wiphy->max_adj_channel_rssi_comp; | |
91 | if (!signal_valid) | |
92 | rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; | |
00d3f14c | 93 | |
0c1ad2ca | 94 | bss = (void *)cbss->priv; |
5484e237 | 95 | |
ef429dad JB |
96 | if (beacon) |
97 | bss->device_ts_beacon = rx_status->device_timestamp; | |
98 | else | |
99 | bss->device_ts_presp = rx_status->device_timestamp; | |
8c358bcd | 100 | |
fcff4f10 PS |
101 | if (elems->parse_error) { |
102 | if (beacon) | |
103 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
104 | else | |
105 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
106 | } else { | |
107 | if (beacon) | |
108 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
109 | else | |
110 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
111 | } | |
112 | ||
5484e237 | 113 | /* save the ERP value so that it is available at association time */ |
1946bed9 JB |
114 | if (elems->erp_info && (!elems->parse_error || |
115 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 116 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 117 | bss->has_erp_value = true; |
fcff4f10 PS |
118 | if (!elems->parse_error) |
119 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
120 | } |
121 | ||
f0b058b6 | 122 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
123 | if (!elems->parse_error || |
124 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
125 | srlen = 0; | |
126 | if (elems->supp_rates) { | |
127 | clen = IEEE80211_MAX_SUPP_RATES; | |
128 | if (clen > elems->supp_rates_len) | |
129 | clen = elems->supp_rates_len; | |
130 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
131 | srlen += clen; | |
132 | } | |
133 | if (elems->ext_supp_rates) { | |
134 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
135 | if (clen > elems->ext_supp_rates_len) | |
136 | clen = elems->ext_supp_rates_len; | |
137 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
138 | clen); | |
139 | srlen += clen; | |
140 | } | |
141 | if (srlen) { | |
142 | bss->supp_rates_len = srlen; | |
143 | if (!elems->parse_error) | |
144 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
145 | } | |
5484e237 | 146 | } |
5484e237 | 147 | |
fcff4f10 PS |
148 | if (!elems->parse_error || |
149 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
150 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
151 | bss->uapsd_supported = is_uapsd_supported(elems); | |
152 | if (!elems->parse_error) | |
153 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
154 | } | |
5484e237 | 155 | |
817cee76 AB |
156 | if (beacon) { |
157 | struct ieee80211_supported_band *sband = | |
158 | local->hw.wiphy->bands[rx_status->band]; | |
159 | if (!(rx_status->flag & RX_FLAG_HT) && | |
160 | !(rx_status->flag & RX_FLAG_VHT)) | |
161 | bss->beacon_rate = | |
162 | &sband->bitrates[rx_status->rate_idx]; | |
163 | } | |
164 | ||
5484e237 JB |
165 | return bss; |
166 | } | |
0a51b27e | 167 | |
d48b2968 | 168 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 169 | { |
f1d58c25 | 170 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
171 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
172 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 173 | struct ieee80211_bss *bss; |
98c8fccf JB |
174 | u8 *elements; |
175 | struct ieee80211_channel *channel; | |
176 | size_t baselen; | |
98c8fccf JB |
177 | struct ieee802_11_elems elems; |
178 | ||
d48b2968 JB |
179 | if (skb->len < 24 || |
180 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
181 | !ieee80211_is_beacon(mgmt->frame_control))) | |
182 | return; | |
98c8fccf | 183 | |
d48b2968 JB |
184 | sdata1 = rcu_dereference(local->scan_sdata); |
185 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 186 | |
d48b2968 JB |
187 | if (likely(!sdata1 && !sdata2)) |
188 | return; | |
98c8fccf | 189 | |
d48b2968 | 190 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
a344d677 JB |
191 | struct cfg80211_scan_request *scan_req; |
192 | struct cfg80211_sched_scan_request *sched_scan_req; | |
193 | ||
194 | scan_req = rcu_dereference(local->scan_req); | |
195 | sched_scan_req = rcu_dereference(local->sched_scan_req); | |
196 | ||
197 | /* ignore ProbeResp to foreign address unless scanning | |
198 | * with randomised address | |
199 | */ | |
200 | if (!(sdata1 && | |
201 | (ether_addr_equal(mgmt->da, sdata1->vif.addr) || | |
202 | scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)) && | |
203 | !(sdata2 && | |
204 | (ether_addr_equal(mgmt->da, sdata2->vif.addr) || | |
205 | sched_scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR))) | |
d48b2968 | 206 | return; |
98c8fccf | 207 | |
98c8fccf JB |
208 | elements = mgmt->u.probe_resp.variable; |
209 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
210 | } else { | |
98c8fccf JB |
211 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
212 | elements = mgmt->u.beacon.variable; | |
213 | } | |
214 | ||
98c8fccf | 215 | if (baselen > skb->len) |
d48b2968 | 216 | return; |
98c8fccf | 217 | |
b2e506bf | 218 | ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); |
98c8fccf | 219 | |
0172bb75 | 220 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
221 | |
222 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 223 | return; |
98c8fccf | 224 | |
d48b2968 | 225 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 226 | mgmt, skb->len, &elems, |
d45c4172 | 227 | channel); |
d048e503 | 228 | if (bss) |
d48b2968 | 229 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
230 | } |
231 | ||
2103dec1 SW |
232 | static void |
233 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, | |
234 | enum nl80211_bss_scan_width scan_width) | |
235 | { | |
236 | memset(chandef, 0, sizeof(*chandef)); | |
237 | switch (scan_width) { | |
238 | case NL80211_BSS_CHAN_WIDTH_5: | |
239 | chandef->width = NL80211_CHAN_WIDTH_5; | |
240 | break; | |
241 | case NL80211_BSS_CHAN_WIDTH_10: | |
242 | chandef->width = NL80211_CHAN_WIDTH_10; | |
243 | break; | |
244 | default: | |
245 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
246 | break; | |
247 | } | |
248 | } | |
249 | ||
4d36ec58 JB |
250 | /* return false if no more work */ |
251 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
252 | { | |
6ea0a69c | 253 | struct cfg80211_scan_request *req; |
2103dec1 | 254 | struct cfg80211_chan_def chandef; |
c56ef672 | 255 | u8 bands_used = 0; |
4d36ec58 JB |
256 | int i, ielen, n_chans; |
257 | ||
6ea0a69c JB |
258 | req = rcu_dereference_protected(local->scan_req, |
259 | lockdep_is_held(&local->mtx)); | |
260 | ||
a754055a EG |
261 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
262 | return false; | |
263 | ||
30686bf7 | 264 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
4d36ec58 | 265 | for (i = 0; i < req->n_channels; i++) { |
c56ef672 DS |
266 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
267 | bands_used |= BIT(req->channels[i]->band); | |
268 | } | |
269 | ||
270 | n_chans = req->n_channels; | |
271 | } else { | |
272 | do { | |
273 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
274 | return false; | |
275 | ||
276 | n_chans = 0; | |
277 | ||
278 | for (i = 0; i < req->n_channels; i++) { | |
279 | if (req->channels[i]->band != | |
280 | local->hw_scan_band) | |
281 | continue; | |
282 | local->hw_scan_req->req.channels[n_chans] = | |
4d36ec58 JB |
283 | req->channels[i]; |
284 | n_chans++; | |
c56ef672 | 285 | bands_used |= BIT(req->channels[i]->band); |
4d36ec58 | 286 | } |
4d36ec58 | 287 | |
c56ef672 DS |
288 | local->hw_scan_band++; |
289 | } while (!n_chans); | |
290 | } | |
4d36ec58 | 291 | |
c56ef672 | 292 | local->hw_scan_req->req.n_channels = n_chans; |
2103dec1 | 293 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
4d36ec58 | 294 | |
c56ef672 DS |
295 | ielen = ieee80211_build_preq_ies(local, |
296 | (u8 *)local->hw_scan_req->req.ie, | |
c604b9f2 | 297 | local->hw_scan_ies_bufsize, |
c56ef672 DS |
298 | &local->hw_scan_req->ies, |
299 | req->ie, req->ie_len, | |
300 | bands_used, req->rates, &chandef); | |
301 | local->hw_scan_req->req.ie_len = ielen; | |
302 | local->hw_scan_req->req.no_cck = req->no_cck; | |
a344d677 JB |
303 | ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); |
304 | ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, | |
305 | req->mac_addr_mask); | |
4d36ec58 JB |
306 | |
307 | return true; | |
308 | } | |
309 | ||
8bd2a248 | 310 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
311 | { |
312 | struct ieee80211_local *local = hw_to_local(hw); | |
8bd2a248 | 313 | bool hw_scan = local->ops->hw_scan; |
a2b70e83 | 314 | bool was_scanning = local->scanning; |
6ea0a69c | 315 | struct cfg80211_scan_request *scan_req; |
a344d677 | 316 | struct ieee80211_sub_if_data *scan_sdata; |
4fa11ec7 | 317 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 318 | |
e229f844 | 319 | lockdep_assert_held(&local->mtx); |
5bc75728 | 320 | |
6d3560d4 JB |
321 | /* |
322 | * It's ok to abort a not-yet-running scan (that | |
323 | * we have one at all will be verified by checking | |
324 | * local->scan_req next), but not to complete it | |
325 | * successfully. | |
326 | */ | |
327 | if (WARN_ON(!local->scanning && !aborted)) | |
328 | aborted = true; | |
5bc75728 | 329 | |
e229f844 | 330 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 331 | return; |
de95a54b | 332 | |
c56ef672 | 333 | if (hw_scan && !aborted && |
30686bf7 | 334 | !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && |
c56ef672 | 335 | ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
336 | int rc; |
337 | ||
338 | rc = drv_hw_scan(local, | |
339 | rcu_dereference_protected(local->scan_sdata, | |
340 | lockdep_is_held(&local->mtx)), | |
341 | local->hw_scan_req); | |
342 | ||
6eb11a9a | 343 | if (rc == 0) |
d07bfd8b | 344 | return; |
4d36ec58 JB |
345 | } |
346 | ||
347 | kfree(local->hw_scan_req); | |
348 | local->hw_scan_req = NULL; | |
f3b85252 | 349 | |
6ea0a69c JB |
350 | scan_req = rcu_dereference_protected(local->scan_req, |
351 | lockdep_is_held(&local->mtx)); | |
352 | ||
353 | if (scan_req != local->int_scan_req) | |
354 | cfg80211_scan_done(scan_req, aborted); | |
355 | RCU_INIT_POINTER(local->scan_req, NULL); | |
a344d677 JB |
356 | |
357 | scan_sdata = rcu_dereference_protected(local->scan_sdata, | |
358 | lockdep_is_held(&local->mtx)); | |
0c2bef46 | 359 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
2a519311 | 360 | |
fbe9c429 | 361 | local->scanning = 0; |
7ca15a0a | 362 | local->scan_chandef.chan = NULL; |
f3b85252 | 363 | |
07ef03ee JB |
364 | /* Set power back to normal operating levels. */ |
365 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 366 | |
8bd2a248 | 367 | if (!hw_scan) { |
e229f844 | 368 | ieee80211_configure_filter(local); |
a344d677 | 369 | drv_sw_scan_complete(local, scan_sdata); |
aacde9ee | 370 | ieee80211_offchannel_return(local); |
e229f844 | 371 | } |
0a51b27e | 372 | |
5cff20e6 | 373 | ieee80211_recalc_idle(local); |
e229f844 | 374 | |
0a51b27e | 375 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 376 | ieee80211_ibss_notify_scan_completed(local); |
4fa11ec7 SK |
377 | |
378 | /* Requeue all the work that might have been ignored while | |
379 | * the scan was in progress; if there was none this will | |
380 | * just be a no-op for the particular interface. | |
381 | */ | |
382 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
383 | if (ieee80211_sdata_running(sdata)) | |
384 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); | |
385 | } | |
386 | ||
a2b70e83 EP |
387 | if (was_scanning) |
388 | ieee80211_start_next_roc(local); | |
0a51b27e | 389 | } |
8789d459 JB |
390 | |
391 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
392 | { | |
393 | struct ieee80211_local *local = hw_to_local(hw); | |
394 | ||
395 | trace_api_scan_completed(local, aborted); | |
396 | ||
397 | set_bit(SCAN_COMPLETED, &local->scanning); | |
398 | if (aborted) | |
399 | set_bit(SCAN_ABORTED, &local->scanning); | |
400 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
401 | } | |
0a51b27e JB |
402 | EXPORT_SYMBOL(ieee80211_scan_completed); |
403 | ||
a344d677 JB |
404 | static int ieee80211_start_sw_scan(struct ieee80211_local *local, |
405 | struct ieee80211_sub_if_data *sdata) | |
f3b85252 | 406 | { |
fe57d9f5 JB |
407 | /* Software scan is not supported in multi-channel cases */ |
408 | if (local->use_chanctx) | |
409 | return -EOPNOTSUPP; | |
410 | ||
f3b85252 JB |
411 | /* |
412 | * Hardware/driver doesn't support hw_scan, so use software | |
413 | * scanning instead. First send a nullfunc frame with power save | |
414 | * bit on so that AP will buffer the frames for us while we are not | |
415 | * listening, then send probe requests to each channel and wait for | |
416 | * the responses. After all channels are scanned, tune back to the | |
417 | * original channel and send a nullfunc frame with power save bit | |
418 | * off to trigger the AP to send us all the buffered frames. | |
419 | * | |
420 | * Note that while local->sw_scanning is true everything else but | |
421 | * nullfunc frames and probe requests will be dropped in | |
422 | * ieee80211_tx_h_check_assoc(). | |
423 | */ | |
a344d677 | 424 | drv_sw_scan_start(local, sdata, local->scan_addr); |
f3b85252 | 425 | |
de312db3 | 426 | local->leave_oper_channel_time = jiffies; |
977923b0 | 427 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
428 | local->scan_channel_idx = 0; |
429 | ||
aacde9ee | 430 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 431 | |
9c35d7d2 | 432 | /* ensure nullfunc is transmitted before leaving operating channel */ |
3b24f4c6 | 433 | ieee80211_flush_queues(local, NULL, false); |
9c35d7d2 | 434 | |
3ac64bee | 435 | ieee80211_configure_filter(local); |
f3b85252 | 436 | |
59bdf3b0 BG |
437 | /* We need to set power level at maximum rate for scanning. */ |
438 | ieee80211_hw_config(local, 0); | |
439 | ||
42935eca | 440 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 441 | &local->scan_work, 0); |
f3b85252 JB |
442 | |
443 | return 0; | |
444 | } | |
445 | ||
133d40f9 SG |
446 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
447 | struct ieee80211_sub_if_data *sdata) | |
448 | { | |
5cbc95a7 | 449 | if (ieee80211_is_radar_required(local)) |
164eb02d SW |
450 | return false; |
451 | ||
2eb278e0 | 452 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
453 | return false; |
454 | ||
455 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
392b9ffb | 456 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
133d40f9 SG |
457 | return false; |
458 | ||
459 | return true; | |
460 | } | |
461 | ||
462 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
463 | { | |
464 | lockdep_assert_held(&local->mtx); | |
465 | ||
466 | if (!local->scan_req || local->scanning) | |
467 | return; | |
468 | ||
e2fd5dbc JB |
469 | if (!ieee80211_can_scan(local, |
470 | rcu_dereference_protected( | |
471 | local->scan_sdata, | |
472 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
473 | return; |
474 | ||
475 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
476 | round_jiffies_relative(0)); | |
477 | } | |
f3b85252 | 478 | |
8a690674 BG |
479 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
480 | unsigned long *next_delay) | |
481 | { | |
482 | int i; | |
e2fd5dbc | 483 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 484 | struct cfg80211_scan_request *scan_req; |
675a0b04 | 485 | enum ieee80211_band band = local->hw.conf.chandef.chan->band; |
6c17b77b SF |
486 | u32 tx_flags; |
487 | ||
6ea0a69c JB |
488 | scan_req = rcu_dereference_protected(local->scan_req, |
489 | lockdep_is_held(&local->mtx)); | |
490 | ||
6c17b77b | 491 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
6ea0a69c | 492 | if (scan_req->no_cck) |
6c17b77b | 493 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
8a690674 | 494 | |
e2fd5dbc | 495 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 496 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 497 | |
6ea0a69c | 498 | for (i = 0; i < scan_req->n_ssids; i++) |
8a690674 | 499 | ieee80211_send_probe_req( |
a344d677 | 500 | sdata, local->scan_addr, NULL, |
6ea0a69c JB |
501 | scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, |
502 | scan_req->ie, scan_req->ie_len, | |
503 | scan_req->rates[band], false, | |
675a0b04 | 504 | tx_flags, local->hw.conf.chandef.chan, true); |
8a690674 BG |
505 | |
506 | /* | |
507 | * After sending probe requests, wait for probe responses | |
508 | * on the channel. | |
509 | */ | |
510 | *next_delay = IEEE80211_CHANNEL_TIME; | |
511 | local->next_scan_state = SCAN_DECISION; | |
512 | } | |
513 | ||
f3b85252 JB |
514 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
515 | struct cfg80211_scan_request *req) | |
516 | { | |
517 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
518 | int rc; |
519 | ||
e229f844 SG |
520 | lockdep_assert_held(&local->mtx); |
521 | ||
2726f23d | 522 | if (local->scan_req || ieee80211_is_radar_required(local)) |
f3b85252 JB |
523 | return -EBUSY; |
524 | ||
133d40f9 | 525 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 526 | /* wait for the work to finish/time out */ |
6ea0a69c | 527 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 528 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
529 | return 0; |
530 | } | |
531 | ||
f3b85252 JB |
532 | if (local->ops->hw_scan) { |
533 | u8 *ies; | |
f3b85252 | 534 | |
e4dcbb37 | 535 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
c56ef672 | 536 | |
30686bf7 | 537 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
c56ef672 DS |
538 | int i, n_bands = 0; |
539 | u8 bands_counted = 0; | |
540 | ||
541 | for (i = 0; i < req->n_channels; i++) { | |
542 | if (bands_counted & BIT(req->channels[i]->band)) | |
543 | continue; | |
544 | bands_counted |= BIT(req->channels[i]->band); | |
545 | n_bands++; | |
546 | } | |
547 | ||
548 | local->hw_scan_ies_bufsize *= n_bands; | |
549 | } | |
550 | ||
4d36ec58 JB |
551 | local->hw_scan_req = kmalloc( |
552 | sizeof(*local->hw_scan_req) + | |
553 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 554 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 555 | if (!local->hw_scan_req) |
f3b85252 JB |
556 | return -ENOMEM; |
557 | ||
c56ef672 DS |
558 | local->hw_scan_req->req.ssids = req->ssids; |
559 | local->hw_scan_req->req.n_ssids = req->n_ssids; | |
4d36ec58 JB |
560 | ies = (u8 *)local->hw_scan_req + |
561 | sizeof(*local->hw_scan_req) + | |
562 | req->n_channels * sizeof(req->channels[0]); | |
c56ef672 DS |
563 | local->hw_scan_req->req.ie = ies; |
564 | local->hw_scan_req->req.flags = req->flags; | |
4d36ec58 JB |
565 | |
566 | local->hw_scan_band = 0; | |
6e7e6213 JL |
567 | |
568 | /* | |
569 | * After allocating local->hw_scan_req, we must | |
570 | * go through until ieee80211_prep_hw_scan(), so | |
571 | * anything that might be changed here and leave | |
572 | * this function early must not go after this | |
573 | * allocation. | |
574 | */ | |
f3b85252 JB |
575 | } |
576 | ||
6ea0a69c | 577 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 578 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 579 | |
a344d677 JB |
580 | if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
581 | get_random_mask_addr(local->scan_addr, | |
582 | req->mac_addr, | |
583 | req->mac_addr_mask); | |
584 | else | |
585 | memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); | |
586 | ||
8a690674 | 587 | if (local->ops->hw_scan) { |
fbe9c429 | 588 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 589 | } else if ((req->n_channels == 1) && |
675a0b04 | 590 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
591 | /* |
592 | * If we are scanning only on the operating channel | |
593 | * then we do not need to stop normal activities | |
8a690674 BG |
594 | */ |
595 | unsigned long next_delay; | |
596 | ||
597 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
598 | ||
599 | ieee80211_recalc_idle(local); | |
600 | ||
601 | /* Notify driver scan is starting, keep order of operations | |
602 | * same as normal software scan, in case that matters. */ | |
a344d677 | 603 | drv_sw_scan_start(local, sdata, local->scan_addr); |
8a690674 BG |
604 | |
605 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
606 | ||
607 | /* We need to ensure power level is at max for scanning. */ | |
608 | ieee80211_hw_config(local, 0); | |
609 | ||
4e39ccac AQ |
610 | if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | |
611 | IEEE80211_CHAN_RADAR)) || | |
6ea0a69c | 612 | !req->n_ssids) { |
8a690674 BG |
613 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
614 | } else { | |
615 | ieee80211_scan_state_send_probe(local, &next_delay); | |
616 | next_delay = IEEE80211_CHANNEL_TIME; | |
617 | } | |
618 | ||
619 | /* Now, just wait a bit and we are all done! */ | |
620 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
621 | next_delay); | |
622 | return 0; | |
623 | } else { | |
624 | /* Do normal software scan */ | |
fbe9c429 | 625 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 626 | } |
6e7e6213 | 627 | |
5cff20e6 | 628 | ieee80211_recalc_idle(local); |
f3b85252 | 629 | |
4d36ec58 JB |
630 | if (local->ops->hw_scan) { |
631 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 632 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
a344d677 JB |
633 | } else { |
634 | rc = ieee80211_start_sw_scan(local, sdata); | |
635 | } | |
f3b85252 | 636 | |
f3b85252 | 637 | if (rc) { |
4d36ec58 JB |
638 | kfree(local->hw_scan_req); |
639 | local->hw_scan_req = NULL; | |
fbe9c429 | 640 | local->scanning = 0; |
f3b85252 | 641 | |
5cff20e6 JB |
642 | ieee80211_recalc_idle(local); |
643 | ||
f3b85252 | 644 | local->scan_req = NULL; |
0c2bef46 | 645 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 JB |
646 | } |
647 | ||
648 | return rc; | |
649 | } | |
650 | ||
df13cce5 HS |
651 | static unsigned long |
652 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
653 | { | |
654 | /* | |
655 | * TODO: channel switching also consumes quite some time, | |
656 | * add that delay as well to get a better estimation | |
657 | */ | |
4e39ccac | 658 | if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) |
df13cce5 HS |
659 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
660 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
661 | } | |
662 | ||
e229f844 SG |
663 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
664 | unsigned long *next_delay) | |
7d3be3cc | 665 | { |
142b9f50 | 666 | bool associated = false; |
df13cce5 HS |
667 | bool tx_empty = true; |
668 | bool bad_latency; | |
142b9f50 | 669 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 670 | struct ieee80211_channel *next_chan; |
cd2bb512 | 671 | enum mac80211_scan_state next_scan_state; |
6ea0a69c | 672 | struct cfg80211_scan_request *scan_req; |
142b9f50 | 673 | |
df13cce5 HS |
674 | /* |
675 | * check if at least one STA interface is associated, | |
676 | * check if at least one STA interface has pending tx frames | |
677 | * and grab the lowest used beacon interval | |
678 | */ | |
142b9f50 HS |
679 | mutex_lock(&local->iflist_mtx); |
680 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 681 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
682 | continue; |
683 | ||
684 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
685 | if (sdata->u.mgd.associated) { | |
686 | associated = true; | |
df13cce5 | 687 | |
df13cce5 HS |
688 | if (!qdisc_all_tx_empty(sdata->dev)) { |
689 | tx_empty = false; | |
690 | break; | |
691 | } | |
142b9f50 HS |
692 | } |
693 | } | |
694 | } | |
695 | mutex_unlock(&local->iflist_mtx); | |
696 | ||
6ea0a69c JB |
697 | scan_req = rcu_dereference_protected(local->scan_req, |
698 | lockdep_is_held(&local->mtx)); | |
699 | ||
700 | next_chan = scan_req->channels[local->scan_channel_idx]; | |
b23b025f | 701 | |
a80f7c0b | 702 | /* |
07ef03ee JB |
703 | * we're currently scanning a different channel, let's |
704 | * see if we can scan another channel without interfering | |
705 | * with the current traffic situation. | |
706 | * | |
3f892b61 | 707 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 708 | */ |
a80f7c0b | 709 | |
07ef03ee | 710 | bad_latency = time_after(jiffies + |
3f892b61 SG |
711 | ieee80211_scan_get_channel_time(next_chan), |
712 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 713 | |
cd2bb512 | 714 | if (associated && !tx_empty) { |
6ea0a69c | 715 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
cd2bb512 SL |
716 | next_scan_state = SCAN_ABORT; |
717 | else | |
718 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 719 | } else if (associated && bad_latency) { |
cd2bb512 SL |
720 | next_scan_state = SCAN_SUSPEND; |
721 | } else { | |
722 | next_scan_state = SCAN_SET_CHANNEL; | |
723 | } | |
724 | ||
725 | local->next_scan_state = next_scan_state; | |
142b9f50 | 726 | |
07ef03ee | 727 | *next_delay = 0; |
142b9f50 HS |
728 | } |
729 | ||
2fb3f028 HS |
730 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
731 | unsigned long *next_delay) | |
732 | { | |
733 | int skip; | |
734 | struct ieee80211_channel *chan; | |
7ca15a0a | 735 | enum nl80211_bss_scan_width oper_scan_width; |
6ea0a69c JB |
736 | struct cfg80211_scan_request *scan_req; |
737 | ||
738 | scan_req = rcu_dereference_protected(local->scan_req, | |
739 | lockdep_is_held(&local->mtx)); | |
2fb3f028 | 740 | |
7d3be3cc | 741 | skip = 0; |
6ea0a69c | 742 | chan = scan_req->channels[local->scan_channel_idx]; |
7d3be3cc | 743 | |
7ca15a0a SW |
744 | local->scan_chandef.chan = chan; |
745 | local->scan_chandef.center_freq1 = chan->center_freq; | |
746 | local->scan_chandef.center_freq2 = 0; | |
6ea0a69c | 747 | switch (scan_req->scan_width) { |
7ca15a0a SW |
748 | case NL80211_BSS_CHAN_WIDTH_5: |
749 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; | |
750 | break; | |
751 | case NL80211_BSS_CHAN_WIDTH_10: | |
752 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; | |
753 | break; | |
754 | case NL80211_BSS_CHAN_WIDTH_20: | |
755 | /* If scanning on oper channel, use whatever channel-type | |
756 | * is currently in use. | |
757 | */ | |
758 | oper_scan_width = cfg80211_chandef_to_scan_width( | |
759 | &local->_oper_chandef); | |
760 | if (chan == local->_oper_chandef.chan && | |
6ea0a69c | 761 | oper_scan_width == scan_req->scan_width) |
7ca15a0a SW |
762 | local->scan_chandef = local->_oper_chandef; |
763 | else | |
764 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; | |
765 | break; | |
766 | } | |
b23b025f | 767 | |
07ef03ee JB |
768 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
769 | skip = 1; | |
7d3be3cc | 770 | |
7d3be3cc HS |
771 | /* advance state machine to next channel/band */ |
772 | local->scan_channel_idx++; | |
773 | ||
0ee9c13c HS |
774 | if (skip) { |
775 | /* if we skip this channel return to the decision state */ | |
776 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 777 | return; |
0ee9c13c | 778 | } |
7d3be3cc HS |
779 | |
780 | /* | |
781 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
782 | * (which unfortunately doesn't say _why_ step a) is done, | |
783 | * but it waits for the probe delay or until a frame is | |
784 | * received - and the received frame would update the NAV). | |
785 | * For now, we do not support waiting until a frame is | |
786 | * received. | |
787 | * | |
788 | * In any case, it is not necessary for a passive scan. | |
789 | */ | |
4e39ccac AQ |
790 | if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || |
791 | !scan_req->n_ssids) { | |
7d3be3cc | 792 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
977923b0 | 793 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 794 | return; |
7d3be3cc HS |
795 | } |
796 | ||
2fb3f028 | 797 | /* active scan, send probes */ |
7d3be3cc | 798 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 799 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
800 | } |
801 | ||
07ef03ee JB |
802 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
803 | unsigned long *next_delay) | |
804 | { | |
805 | /* switch back to the operating channel */ | |
7ca15a0a | 806 | local->scan_chandef.chan = NULL; |
07ef03ee JB |
807 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
808 | ||
aacde9ee SG |
809 | /* disable PS */ |
810 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
811 | |
812 | *next_delay = HZ / 5; | |
813 | /* afterwards, resume scan & go to next channel */ | |
814 | local->next_scan_state = SCAN_RESUME; | |
815 | } | |
816 | ||
817 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
818 | unsigned long *next_delay) | |
819 | { | |
aacde9ee | 820 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
821 | |
822 | if (local->ops->flush) { | |
3b24f4c6 | 823 | ieee80211_flush_queues(local, NULL, false); |
07ef03ee JB |
824 | *next_delay = 0; |
825 | } else | |
826 | *next_delay = HZ / 10; | |
827 | ||
828 | /* remember when we left the operating channel */ | |
829 | local->leave_oper_channel_time = jiffies; | |
830 | ||
831 | /* advance to the next channel to be scanned */ | |
de2ee84d | 832 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
833 | } |
834 | ||
c2b13452 | 835 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
836 | { |
837 | struct ieee80211_local *local = | |
838 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 839 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 840 | struct cfg80211_scan_request *scan_req; |
0a51b27e | 841 | unsigned long next_delay = 0; |
8bd2a248 | 842 | bool aborted; |
0a51b27e | 843 | |
259b62e3 | 844 | mutex_lock(&local->mtx); |
8789d459 | 845 | |
332ff7fe LC |
846 | if (!ieee80211_can_run_worker(local)) { |
847 | aborted = true; | |
848 | goto out_complete; | |
849 | } | |
850 | ||
e2fd5dbc JB |
851 | sdata = rcu_dereference_protected(local->scan_sdata, |
852 | lockdep_is_held(&local->mtx)); | |
6ea0a69c JB |
853 | scan_req = rcu_dereference_protected(local->scan_req, |
854 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 855 | |
8a690674 BG |
856 | /* When scanning on-channel, the first-callback means completed. */ |
857 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
858 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
859 | goto out_complete; | |
860 | } | |
861 | ||
259b62e3 | 862 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 863 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 864 | goto out_complete; |
8789d459 JB |
865 | } |
866 | ||
6ea0a69c | 867 | if (!sdata || !scan_req) |
259b62e3 | 868 | goto out; |
f3b85252 | 869 | |
ff5db439 | 870 | if (!local->scanning) { |
f3b85252 JB |
871 | int rc; |
872 | ||
6ea0a69c | 873 | RCU_INIT_POINTER(local->scan_req, NULL); |
0c2bef46 | 874 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 | 875 | |
6ea0a69c | 876 | rc = __ieee80211_start_scan(sdata, scan_req); |
259b62e3 | 877 | if (rc) { |
3aed49ef | 878 | /* need to complete scan in cfg80211 */ |
6ea0a69c | 879 | rcu_assign_pointer(local->scan_req, scan_req); |
259b62e3 SG |
880 | aborted = true; |
881 | goto out_complete; | |
882 | } else | |
883 | goto out; | |
f3b85252 JB |
884 | } |
885 | ||
f502d09b HS |
886 | /* |
887 | * as long as no delay is required advance immediately | |
888 | * without scheduling a new work | |
889 | */ | |
890 | do { | |
c29acf20 RM |
891 | if (!ieee80211_sdata_running(sdata)) { |
892 | aborted = true; | |
893 | goto out_complete; | |
894 | } | |
895 | ||
977923b0 | 896 | switch (local->next_scan_state) { |
2fb3f028 | 897 | case SCAN_DECISION: |
e229f844 | 898 | /* if no more bands/channels left, complete scan */ |
6ea0a69c | 899 | if (local->scan_channel_idx >= scan_req->n_channels) { |
e229f844 SG |
900 | aborted = false; |
901 | goto out_complete; | |
902 | } | |
903 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 904 | break; |
2fb3f028 HS |
905 | case SCAN_SET_CHANNEL: |
906 | ieee80211_scan_state_set_channel(local, &next_delay); | |
907 | break; | |
f502d09b HS |
908 | case SCAN_SEND_PROBE: |
909 | ieee80211_scan_state_send_probe(local, &next_delay); | |
910 | break; | |
07ef03ee JB |
911 | case SCAN_SUSPEND: |
912 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 913 | break; |
07ef03ee JB |
914 | case SCAN_RESUME: |
915 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 916 | break; |
cd2bb512 SL |
917 | case SCAN_ABORT: |
918 | aborted = true; | |
919 | goto out_complete; | |
f502d09b HS |
920 | } |
921 | } while (next_delay == 0); | |
0a51b27e | 922 | |
42935eca | 923 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 924 | goto out; |
259b62e3 SG |
925 | |
926 | out_complete: | |
8bd2a248 | 927 | __ieee80211_scan_completed(&local->hw, aborted); |
259b62e3 SG |
928 | out: |
929 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
930 | } |
931 | ||
f3b85252 JB |
932 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
933 | struct cfg80211_scan_request *req) | |
0a51b27e | 934 | { |
f3b85252 | 935 | int res; |
de95a54b | 936 | |
a1699b75 | 937 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 938 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 939 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 940 | |
f3b85252 | 941 | return res; |
0a51b27e JB |
942 | } |
943 | ||
34bcf715 SG |
944 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
945 | const u8 *ssid, u8 ssid_len, | |
76bed0f4 JD |
946 | struct ieee80211_channel **channels, |
947 | unsigned int n_channels, | |
7ca15a0a | 948 | enum nl80211_bss_scan_width scan_width) |
0a51b27e | 949 | { |
0a51b27e | 950 | struct ieee80211_local *local = sdata->local; |
76bed0f4 | 951 | int ret = -EBUSY, i, n_ch = 0; |
fb63bc41 | 952 | enum ieee80211_band band; |
2a519311 | 953 | |
a1699b75 | 954 | mutex_lock(&local->mtx); |
0a51b27e | 955 | |
f3b85252 JB |
956 | /* busy scanning */ |
957 | if (local->scan_req) | |
958 | goto unlock; | |
9116dd01 | 959 | |
be4a4b6a | 960 | /* fill internal scan request */ |
76bed0f4 JD |
961 | if (!channels) { |
962 | int max_n; | |
be4a4b6a JB |
963 | |
964 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
965 | if (!local->hw.wiphy->bands[band]) | |
966 | continue; | |
34bcf715 SG |
967 | |
968 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
969 | for (i = 0; i < max_n; i++) { | |
970 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 971 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 | 972 | |
8fe02e16 | 973 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
974 | IEEE80211_CHAN_DISABLED)) |
975 | continue; | |
976 | ||
977 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
978 | n_ch++; | |
be4a4b6a JB |
979 | } |
980 | } | |
981 | ||
34bcf715 SG |
982 | if (WARN_ON_ONCE(n_ch == 0)) |
983 | goto unlock; | |
984 | ||
985 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 986 | } else { |
76bed0f4 JD |
987 | for (i = 0; i < n_channels; i++) { |
988 | if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | | |
989 | IEEE80211_CHAN_DISABLED)) | |
990 | continue; | |
991 | ||
992 | local->int_scan_req->channels[n_ch] = channels[i]; | |
993 | n_ch++; | |
994 | } | |
995 | ||
996 | if (WARN_ON_ONCE(n_ch == 0)) | |
34bcf715 SG |
997 | goto unlock; |
998 | ||
76bed0f4 | 999 | local->int_scan_req->n_channels = n_ch; |
be4a4b6a JB |
1000 | } |
1001 | ||
1002 | local->int_scan_req->ssids = &local->scan_ssid; | |
1003 | local->int_scan_req->n_ssids = 1; | |
7ca15a0a | 1004 | local->int_scan_req->scan_width = scan_width; |
5ba63533 JB |
1005 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
1006 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 1007 | |
5ba63533 | 1008 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 1009 | unlock: |
a1699b75 | 1010 | mutex_unlock(&local->mtx); |
f3b85252 | 1011 | return ret; |
0a51b27e | 1012 | } |
5bb644a0 | 1013 | |
4136c422 SG |
1014 | /* |
1015 | * Only call this function when a scan can't be queued -- under RTNL. | |
1016 | */ | |
5bb644a0 JB |
1017 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
1018 | { | |
5bb644a0 | 1019 | /* |
b856439b | 1020 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
1021 | * yet really started (see __ieee80211_start_scan ). |
1022 | * | |
1023 | * Regarding hardware scan: | |
1024 | * - we can not call __ieee80211_scan_completed() as when | |
1025 | * SCAN_HW_SCANNING bit is set this function change | |
1026 | * local->hw_scan_req to operate on 5G band, what race with | |
1027 | * driver which can use local->hw_scan_req | |
1028 | * | |
1029 | * - we can not cancel scan_work since driver can schedule it | |
1030 | * by ieee80211_scan_completed(..., true) to finish scan | |
1031 | * | |
b856439b EP |
1032 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
1033 | * driver is still responsible for calling ieee80211_scan_completed() | |
1034 | * after the scan was completed/aborted. | |
5bb644a0 | 1035 | */ |
4136c422 | 1036 | |
a1699b75 | 1037 | mutex_lock(&local->mtx); |
b856439b EP |
1038 | if (!local->scan_req) |
1039 | goto out; | |
1040 | ||
a754055a EG |
1041 | /* |
1042 | * We have a scan running and the driver already reported completion, | |
1043 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
1044 | * cancelled. | |
1045 | */ | |
1046 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
1047 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
1048 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
1049 | goto out; | |
1050 | } | |
1051 | ||
b856439b | 1052 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
a754055a EG |
1053 | /* |
1054 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
1055 | * scan on another band. | |
1056 | */ | |
1057 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 1058 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
1059 | drv_cancel_hw_scan(local, |
1060 | rcu_dereference_protected(local->scan_sdata, | |
1061 | lockdep_is_held(&local->mtx))); | |
b856439b | 1062 | goto out; |
4136c422 | 1063 | } |
b856439b EP |
1064 | |
1065 | /* | |
1066 | * If the work is currently running, it must be blocked on | |
1067 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
1068 | * simply exit once it acquires the mutex. | |
1069 | */ | |
1070 | cancel_delayed_work(&local->scan_work); | |
1071 | /* and clean up */ | |
8bd2a248 | 1072 | __ieee80211_scan_completed(&local->hw, true); |
b856439b | 1073 | out: |
d07bfd8b | 1074 | mutex_unlock(&local->mtx); |
5bb644a0 | 1075 | } |
79f460ca | 1076 | |
d43c6b6e DS |
1077 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1078 | struct cfg80211_sched_scan_request *req) | |
79f460ca LC |
1079 | { |
1080 | struct ieee80211_local *local = sdata->local; | |
633e2713 | 1081 | struct ieee80211_scan_ies sched_scan_ies = {}; |
2103dec1 | 1082 | struct cfg80211_chan_def chandef; |
633e2713 DS |
1083 | int ret, i, iebufsz, num_bands = 0; |
1084 | u32 rate_masks[IEEE80211_NUM_BANDS] = {}; | |
1085 | u8 bands_used = 0; | |
1086 | u8 *ie; | |
1087 | size_t len; | |
c604b9f2 | 1088 | |
e4dcbb37 | 1089 | iebufsz = local->scan_ies_len + req->ie_len; |
79f460ca | 1090 | |
d43c6b6e | 1091 | lockdep_assert_held(&local->mtx); |
79f460ca | 1092 | |
d43c6b6e DS |
1093 | if (!local->ops->sched_scan_start) |
1094 | return -ENOTSUPP; | |
79f460ca LC |
1095 | |
1096 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
633e2713 DS |
1097 | if (local->hw.wiphy->bands[i]) { |
1098 | bands_used |= BIT(i); | |
1099 | rate_masks[i] = (u32) -1; | |
1100 | num_bands++; | |
79f460ca | 1101 | } |
633e2713 | 1102 | } |
79f460ca | 1103 | |
633e2713 DS |
1104 | ie = kzalloc(num_bands * iebufsz, GFP_KERNEL); |
1105 | if (!ie) { | |
1106 | ret = -ENOMEM; | |
1107 | goto out; | |
79f460ca LC |
1108 | } |
1109 | ||
633e2713 DS |
1110 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
1111 | ||
1112 | len = ieee80211_build_preq_ies(local, ie, num_bands * iebufsz, | |
1113 | &sched_scan_ies, req->ie, | |
1114 | req->ie_len, bands_used, | |
1115 | rate_masks, &chandef); | |
1116 | ||
30dd3edf | 1117 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
d43c6b6e | 1118 | if (ret == 0) { |
5260a5b2 | 1119 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
6ea0a69c | 1120 | rcu_assign_pointer(local->sched_scan_req, req); |
d43c6b6e | 1121 | } |
79f460ca | 1122 | |
633e2713 | 1123 | kfree(ie); |
d43c6b6e | 1124 | |
633e2713 | 1125 | out: |
d43c6b6e DS |
1126 | if (ret) { |
1127 | /* Clean in case of failure after HW restart or upon resume. */ | |
0c2bef46 | 1128 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
6ea0a69c | 1129 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e DS |
1130 | } |
1131 | ||
1132 | return ret; | |
1133 | } | |
1134 | ||
1135 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
1136 | struct cfg80211_sched_scan_request *req) | |
1137 | { | |
1138 | struct ieee80211_local *local = sdata->local; | |
1139 | int ret; | |
1140 | ||
1141 | mutex_lock(&local->mtx); | |
1142 | ||
1143 | if (rcu_access_pointer(local->sched_scan_sdata)) { | |
1144 | mutex_unlock(&local->mtx); | |
1145 | return -EBUSY; | |
1146 | } | |
1147 | ||
1148 | ret = __ieee80211_request_sched_scan_start(sdata, req); | |
1149 | ||
5260a5b2 | 1150 | mutex_unlock(&local->mtx); |
79f460ca LC |
1151 | return ret; |
1152 | } | |
1153 | ||
0d440ea2 | 1154 | int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) |
79f460ca | 1155 | { |
0d440ea2 EP |
1156 | struct ieee80211_sub_if_data *sched_scan_sdata; |
1157 | int ret = -ENOENT; | |
79f460ca | 1158 | |
5260a5b2 | 1159 | mutex_lock(&local->mtx); |
79f460ca LC |
1160 | |
1161 | if (!local->ops->sched_scan_stop) { | |
1162 | ret = -ENOTSUPP; | |
1163 | goto out; | |
1164 | } | |
1165 | ||
d43c6b6e | 1166 | /* We don't want to restart sched scan anymore. */ |
6ea0a69c | 1167 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1168 | |
0d440ea2 EP |
1169 | sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, |
1170 | lockdep_is_held(&local->mtx)); | |
1171 | if (sched_scan_sdata) { | |
1172 | ret = drv_sched_scan_stop(local, sched_scan_sdata); | |
71228a1e | 1173 | if (!ret) |
ad053a96 | 1174 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
71228a1e | 1175 | } |
79f460ca | 1176 | out: |
5260a5b2 | 1177 | mutex_unlock(&local->mtx); |
79f460ca LC |
1178 | |
1179 | return ret; | |
1180 | } | |
1181 | ||
1182 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1183 | { | |
1184 | struct ieee80211_local *local = hw_to_local(hw); | |
1185 | ||
1186 | trace_api_sched_scan_results(local); | |
1187 | ||
1188 | cfg80211_sched_scan_results(hw->wiphy); | |
1189 | } | |
1190 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1191 | ||
f6837ba8 | 1192 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
85a9994a | 1193 | { |
85a9994a LC |
1194 | mutex_lock(&local->mtx); |
1195 | ||
5260a5b2 | 1196 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1197 | mutex_unlock(&local->mtx); |
1198 | return; | |
1199 | } | |
1200 | ||
0c2bef46 | 1201 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
85a9994a | 1202 | |
d43c6b6e | 1203 | /* If sched scan was aborted by the driver. */ |
6ea0a69c | 1204 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1205 | |
85a9994a LC |
1206 | mutex_unlock(&local->mtx); |
1207 | ||
1208 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
1209 | } | |
1210 | ||
f6837ba8 JB |
1211 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1212 | { | |
1213 | struct ieee80211_local *local = | |
1214 | container_of(work, struct ieee80211_local, | |
1215 | sched_scan_stopped_work); | |
1216 | ||
1217 | ieee80211_sched_scan_end(local); | |
1218 | } | |
1219 | ||
79f460ca LC |
1220 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1221 | { | |
1222 | struct ieee80211_local *local = hw_to_local(hw); | |
1223 | ||
1224 | trace_api_sched_scan_stopped(local); | |
1225 | ||
2bc533bd EP |
1226 | /* |
1227 | * this shouldn't really happen, so for simplicity | |
1228 | * simply ignore it, and let mac80211 reconfigure | |
1229 | * the sched scan later on. | |
1230 | */ | |
1231 | if (local->in_reconfig) | |
1232 | return; | |
1233 | ||
18db594a | 1234 | schedule_work(&local->sched_scan_stopped_work); |
79f460ca LC |
1235 | } |
1236 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |