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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0a51b27e | 2 | /* |
5484e237 JB |
3 | * Scanning implementation |
4 | * | |
0a51b27e JB |
5 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
6 | * Copyright 2004, Instant802 Networks, Inc. | |
7 | * Copyright 2005, Devicescape Software, Inc. | |
8 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
9 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
74d803b6 | 10 | * Copyright 2013-2015 Intel Mobile Communications GmbH |
40b0bd24 | 11 | * Copyright 2016-2017 Intel Deutschland GmbH |
c8cb5b85 | 12 | * Copyright (C) 2018-2020 Intel Corporation |
0a51b27e JB |
13 | */ |
14 | ||
0a51b27e | 15 | #include <linux/if_arp.h> |
888d04df | 16 | #include <linux/etherdevice.h> |
078e1e60 | 17 | #include <linux/rtnetlink.h> |
df13cce5 | 18 | #include <net/sch_generic.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
bc3b2d7f | 20 | #include <linux/export.h> |
b9771d41 | 21 | #include <linux/random.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 | ||
fcea7db5 SS |
58 | static void |
59 | ieee80211_update_bss_from_elems(struct ieee80211_local *local, | |
60 | struct ieee80211_bss *bss, | |
61 | struct ieee802_11_elems *elems, | |
62 | struct ieee80211_rx_status *rx_status, | |
63 | bool beacon) | |
64 | { | |
65 | int clen, srlen; | |
66 | ||
67 | if (beacon) | |
68 | bss->device_ts_beacon = rx_status->device_timestamp; | |
69 | else | |
70 | bss->device_ts_presp = rx_status->device_timestamp; | |
71 | ||
72 | if (elems->parse_error) { | |
73 | if (beacon) | |
74 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
75 | else | |
76 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
77 | } else { | |
78 | if (beacon) | |
79 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
80 | else | |
81 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
82 | } | |
83 | ||
84 | /* save the ERP value so that it is available at association time */ | |
85 | if (elems->erp_info && (!elems->parse_error || | |
86 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
87 | bss->erp_value = elems->erp_info[0]; | |
88 | bss->has_erp_value = true; | |
89 | if (!elems->parse_error) | |
90 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
91 | } | |
92 | ||
93 | /* replace old supported rates if we get new values */ | |
94 | if (!elems->parse_error || | |
95 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
96 | srlen = 0; | |
97 | if (elems->supp_rates) { | |
98 | clen = IEEE80211_MAX_SUPP_RATES; | |
99 | if (clen > elems->supp_rates_len) | |
100 | clen = elems->supp_rates_len; | |
101 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
102 | srlen += clen; | |
103 | } | |
104 | if (elems->ext_supp_rates) { | |
105 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
106 | if (clen > elems->ext_supp_rates_len) | |
107 | clen = elems->ext_supp_rates_len; | |
108 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
109 | clen); | |
110 | srlen += clen; | |
111 | } | |
112 | if (srlen) { | |
113 | bss->supp_rates_len = srlen; | |
114 | if (!elems->parse_error) | |
115 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
116 | } | |
117 | } | |
118 | ||
119 | if (!elems->parse_error || | |
120 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
121 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
122 | bss->uapsd_supported = is_uapsd_supported(elems); | |
123 | if (!elems->parse_error) | |
124 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
125 | } | |
126 | ||
127 | if (beacon) { | |
128 | struct ieee80211_supported_band *sband = | |
129 | local->hw.wiphy->bands[rx_status->band]; | |
130 | if (!(rx_status->encoding == RX_ENC_HT) && | |
131 | !(rx_status->encoding == RX_ENC_VHT)) | |
132 | bss->beacon_rate = | |
133 | &sband->bitrates[rx_status->rate_idx]; | |
134 | } | |
2a333a0d JB |
135 | |
136 | if (elems->vht_cap_elem) | |
137 | bss->vht_cap_info = | |
138 | le32_to_cpu(elems->vht_cap_elem->vht_cap_info); | |
139 | else | |
140 | bss->vht_cap_info = 0; | |
fcea7db5 SS |
141 | } |
142 | ||
c2b13452 | 143 | struct ieee80211_bss * |
5484e237 JB |
144 | ieee80211_bss_info_update(struct ieee80211_local *local, |
145 | struct ieee80211_rx_status *rx_status, | |
d45c4172 | 146 | struct ieee80211_mgmt *mgmt, size_t len, |
d45c4172 | 147 | struct ieee80211_channel *channel) |
5484e237 | 148 | { |
cd418ba6 TP |
149 | bool beacon = ieee80211_is_beacon(mgmt->frame_control) || |
150 | ieee80211_is_s1g_beacon(mgmt->frame_control); | |
78ac51f8 SS |
151 | struct cfg80211_bss *cbss, *non_tx_cbss; |
152 | struct ieee80211_bss *bss, *non_tx_bss; | |
162dd6a7 JB |
153 | struct cfg80211_inform_bss bss_meta = { |
154 | .boottime_ns = rx_status->boottime_ns, | |
155 | }; | |
74d803b6 | 156 | bool signal_valid; |
7947d3e0 | 157 | struct ieee80211_sub_if_data *scan_sdata; |
4abb52a4 SS |
158 | struct ieee802_11_elems elems; |
159 | size_t baselen; | |
160 | u8 *elements; | |
2a519311 | 161 | |
1ad22fb5 T |
162 | if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL) |
163 | bss_meta.signal = 0; /* invalid signal indication */ | |
164 | else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) | |
61f6bba0 | 165 | bss_meta.signal = rx_status->signal * 100; |
30686bf7 | 166 | else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) |
61f6bba0 | 167 | bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 168 | |
61f6bba0 | 169 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20; |
da6a4352 | 170 | if (rx_status->bw == RATE_INFO_BW_5) |
61f6bba0 | 171 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5; |
da6a4352 | 172 | else if (rx_status->bw == RATE_INFO_BW_10) |
61f6bba0 | 173 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10; |
7ca15a0a | 174 | |
61f6bba0 | 175 | bss_meta.chan = channel; |
7947d3e0 AS |
176 | |
177 | rcu_read_lock(); | |
178 | scan_sdata = rcu_dereference(local->scan_sdata); | |
179 | if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION && | |
180 | scan_sdata->vif.bss_conf.assoc && | |
181 | ieee80211_have_rx_timestamp(rx_status)) { | |
182 | bss_meta.parent_tsf = | |
183 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
184 | len + FCS_LEN, 24); | |
185 | ether_addr_copy(bss_meta.parent_bssid, | |
186 | scan_sdata->vif.bss_conf.bssid); | |
187 | } | |
188 | rcu_read_unlock(); | |
189 | ||
61f6bba0 JB |
190 | cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, |
191 | mgmt, len, GFP_ATOMIC); | |
0c1ad2ca | 192 | if (!cbss) |
00d3f14c | 193 | return NULL; |
4abb52a4 SS |
194 | |
195 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { | |
196 | elements = mgmt->u.probe_resp.variable; | |
197 | baselen = offsetof(struct ieee80211_mgmt, | |
198 | u.probe_resp.variable); | |
cd418ba6 TP |
199 | } else if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { |
200 | struct ieee80211_ext *ext = (void *) mgmt; | |
201 | ||
202 | baselen = offsetof(struct ieee80211_ext, u.s1g_beacon.variable); | |
203 | elements = ext->u.s1g_beacon.variable; | |
4abb52a4 SS |
204 | } else { |
205 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); | |
206 | elements = mgmt->u.beacon.variable; | |
207 | } | |
208 | ||
209 | if (baselen > len) | |
210 | return NULL; | |
211 | ||
212 | ieee802_11_parse_elems(elements, len - baselen, false, &elems, | |
213 | mgmt->bssid, cbss->bssid); | |
214 | ||
74d803b6 | 215 | /* In case the signal is invalid update the status */ |
7bb106eb | 216 | signal_valid = channel == cbss->channel; |
74d803b6 SS |
217 | if (!signal_valid) |
218 | rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; | |
00d3f14c | 219 | |
0c1ad2ca | 220 | bss = (void *)cbss->priv; |
fcea7db5 | 221 | ieee80211_update_bss_from_elems(local, bss, &elems, rx_status, beacon); |
817cee76 | 222 | |
78ac51f8 SS |
223 | list_for_each_entry(non_tx_cbss, &cbss->nontrans_list, nontrans_list) { |
224 | non_tx_bss = (void *)non_tx_cbss->priv; | |
225 | ||
226 | ieee80211_update_bss_from_elems(local, non_tx_bss, &elems, | |
227 | rx_status, beacon); | |
228 | } | |
229 | ||
5484e237 JB |
230 | return bss; |
231 | } | |
0a51b27e | 232 | |
40b0bd24 RZ |
233 | static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata, |
234 | u32 scan_flags, const u8 *da) | |
235 | { | |
236 | if (!sdata) | |
237 | return false; | |
238 | /* accept broadcast for OCE */ | |
239 | if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP && | |
240 | is_broadcast_ether_addr(da)) | |
241 | return true; | |
242 | if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR) | |
243 | return true; | |
244 | return ether_addr_equal(da, sdata->vif.addr); | |
245 | } | |
246 | ||
d48b2968 | 247 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 248 | { |
f1d58c25 | 249 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
250 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
251 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 252 | struct ieee80211_bss *bss; |
98c8fccf | 253 | struct ieee80211_channel *channel; |
98c8fccf | 254 | |
cd418ba6 TP |
255 | if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { |
256 | if (skb->len < 15) | |
257 | return; | |
258 | } else if (skb->len < 24 || | |
259 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
260 | !ieee80211_is_beacon(mgmt->frame_control))) | |
d48b2968 | 261 | return; |
98c8fccf | 262 | |
d48b2968 JB |
263 | sdata1 = rcu_dereference(local->scan_sdata); |
264 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 265 | |
d48b2968 JB |
266 | if (likely(!sdata1 && !sdata2)) |
267 | return; | |
98c8fccf | 268 | |
d48b2968 | 269 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
a344d677 JB |
270 | struct cfg80211_scan_request *scan_req; |
271 | struct cfg80211_sched_scan_request *sched_scan_req; | |
40b0bd24 | 272 | u32 scan_req_flags = 0, sched_scan_req_flags = 0; |
a344d677 JB |
273 | |
274 | scan_req = rcu_dereference(local->scan_req); | |
275 | sched_scan_req = rcu_dereference(local->sched_scan_req); | |
276 | ||
40b0bd24 RZ |
277 | if (scan_req) |
278 | scan_req_flags = scan_req->flags; | |
279 | ||
280 | if (sched_scan_req) | |
281 | sched_scan_req_flags = sched_scan_req->flags; | |
282 | ||
283 | /* ignore ProbeResp to foreign address or non-bcast (OCE) | |
284 | * unless scanning with randomised address | |
a344d677 | 285 | */ |
40b0bd24 RZ |
286 | if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags, |
287 | mgmt->da) && | |
288 | !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags, | |
289 | mgmt->da)) | |
d48b2968 | 290 | return; |
98c8fccf JB |
291 | } |
292 | ||
3b23c184 TP |
293 | channel = ieee80211_get_channel_khz(local->hw.wiphy, |
294 | ieee80211_rx_status_to_khz(rx_status)); | |
98c8fccf JB |
295 | |
296 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 297 | return; |
98c8fccf | 298 | |
d48b2968 | 299 | bss = ieee80211_bss_info_update(local, rx_status, |
4abb52a4 | 300 | mgmt, skb->len, |
d45c4172 | 301 | channel); |
d048e503 | 302 | if (bss) |
d48b2968 | 303 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
304 | } |
305 | ||
2103dec1 SW |
306 | static void |
307 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, | |
308 | enum nl80211_bss_scan_width scan_width) | |
309 | { | |
310 | memset(chandef, 0, sizeof(*chandef)); | |
311 | switch (scan_width) { | |
312 | case NL80211_BSS_CHAN_WIDTH_5: | |
313 | chandef->width = NL80211_CHAN_WIDTH_5; | |
314 | break; | |
315 | case NL80211_BSS_CHAN_WIDTH_10: | |
316 | chandef->width = NL80211_CHAN_WIDTH_10; | |
317 | break; | |
318 | default: | |
319 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
320 | break; | |
321 | } | |
322 | } | |
323 | ||
4d36ec58 | 324 | /* return false if no more work */ |
2ad2274c | 325 | static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata) |
4d36ec58 | 326 | { |
2ad2274c | 327 | struct ieee80211_local *local = sdata->local; |
6ea0a69c | 328 | struct cfg80211_scan_request *req; |
2103dec1 | 329 | struct cfg80211_chan_def chandef; |
c56ef672 | 330 | u8 bands_used = 0; |
4d36ec58 | 331 | int i, ielen, n_chans; |
b9771d41 | 332 | u32 flags = 0; |
4d36ec58 | 333 | |
6ea0a69c JB |
334 | req = rcu_dereference_protected(local->scan_req, |
335 | lockdep_is_held(&local->mtx)); | |
336 | ||
a754055a EG |
337 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
338 | return false; | |
339 | ||
30686bf7 | 340 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
4d36ec58 | 341 | for (i = 0; i < req->n_channels; i++) { |
c56ef672 DS |
342 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
343 | bands_used |= BIT(req->channels[i]->band); | |
344 | } | |
345 | ||
346 | n_chans = req->n_channels; | |
347 | } else { | |
348 | do { | |
57fbcce3 | 349 | if (local->hw_scan_band == NUM_NL80211_BANDS) |
c56ef672 DS |
350 | return false; |
351 | ||
352 | n_chans = 0; | |
353 | ||
354 | for (i = 0; i < req->n_channels; i++) { | |
355 | if (req->channels[i]->band != | |
356 | local->hw_scan_band) | |
357 | continue; | |
358 | local->hw_scan_req->req.channels[n_chans] = | |
4d36ec58 JB |
359 | req->channels[i]; |
360 | n_chans++; | |
c56ef672 | 361 | bands_used |= BIT(req->channels[i]->band); |
4d36ec58 | 362 | } |
4d36ec58 | 363 | |
c56ef672 DS |
364 | local->hw_scan_band++; |
365 | } while (!n_chans); | |
366 | } | |
4d36ec58 | 367 | |
c56ef672 | 368 | local->hw_scan_req->req.n_channels = n_chans; |
2103dec1 | 369 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
4d36ec58 | 370 | |
b9771d41 JB |
371 | if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
372 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; | |
373 | ||
2ad2274c | 374 | ielen = ieee80211_build_preq_ies(sdata, |
c56ef672 | 375 | (u8 *)local->hw_scan_req->req.ie, |
c604b9f2 | 376 | local->hw_scan_ies_bufsize, |
c56ef672 DS |
377 | &local->hw_scan_req->ies, |
378 | req->ie, req->ie_len, | |
b9771d41 JB |
379 | bands_used, req->rates, &chandef, |
380 | flags); | |
c56ef672 DS |
381 | local->hw_scan_req->req.ie_len = ielen; |
382 | local->hw_scan_req->req.no_cck = req->no_cck; | |
a344d677 JB |
383 | ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); |
384 | ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, | |
385 | req->mac_addr_mask); | |
e345f44f | 386 | ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); |
4d36ec58 JB |
387 | |
388 | return true; | |
389 | } | |
390 | ||
8bd2a248 | 391 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
392 | { |
393 | struct ieee80211_local *local = hw_to_local(hw); | |
e9da68dd | 394 | bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
a2b70e83 | 395 | bool was_scanning = local->scanning; |
6ea0a69c | 396 | struct cfg80211_scan_request *scan_req; |
a344d677 | 397 | struct ieee80211_sub_if_data *scan_sdata; |
4fa11ec7 | 398 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 399 | |
e229f844 | 400 | lockdep_assert_held(&local->mtx); |
5bc75728 | 401 | |
6d3560d4 JB |
402 | /* |
403 | * It's ok to abort a not-yet-running scan (that | |
404 | * we have one at all will be verified by checking | |
405 | * local->scan_req next), but not to complete it | |
406 | * successfully. | |
407 | */ | |
408 | if (WARN_ON(!local->scanning && !aborted)) | |
409 | aborted = true; | |
5bc75728 | 410 | |
e229f844 | 411 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 412 | return; |
de95a54b | 413 | |
2ad2274c IP |
414 | scan_sdata = rcu_dereference_protected(local->scan_sdata, |
415 | lockdep_is_held(&local->mtx)); | |
416 | ||
c56ef672 | 417 | if (hw_scan && !aborted && |
30686bf7 | 418 | !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && |
2ad2274c | 419 | ieee80211_prep_hw_scan(scan_sdata)) { |
e2fd5dbc JB |
420 | int rc; |
421 | ||
422 | rc = drv_hw_scan(local, | |
423 | rcu_dereference_protected(local->scan_sdata, | |
424 | lockdep_is_held(&local->mtx)), | |
425 | local->hw_scan_req); | |
426 | ||
6eb11a9a | 427 | if (rc == 0) |
d07bfd8b | 428 | return; |
7947d3e0 | 429 | |
7d10f6b1 JB |
430 | /* HW scan failed and is going to be reported as aborted, |
431 | * so clear old scan info. | |
7947d3e0 AS |
432 | */ |
433 | memset(&local->scan_info, 0, sizeof(local->scan_info)); | |
7d10f6b1 | 434 | aborted = true; |
4d36ec58 JB |
435 | } |
436 | ||
437 | kfree(local->hw_scan_req); | |
438 | local->hw_scan_req = NULL; | |
f3b85252 | 439 | |
6ea0a69c JB |
440 | scan_req = rcu_dereference_protected(local->scan_req, |
441 | lockdep_is_held(&local->mtx)); | |
442 | ||
1d76250b | 443 | if (scan_req != local->int_scan_req) { |
7947d3e0 AS |
444 | local->scan_info.aborted = aborted; |
445 | cfg80211_scan_done(scan_req, &local->scan_info); | |
1d76250b | 446 | } |
6ea0a69c | 447 | RCU_INIT_POINTER(local->scan_req, NULL); |
0c2bef46 | 448 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
2a519311 | 449 | |
fbe9c429 | 450 | local->scanning = 0; |
7ca15a0a | 451 | local->scan_chandef.chan = NULL; |
f3b85252 | 452 | |
07ef03ee JB |
453 | /* Set power back to normal operating levels. */ |
454 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 455 | |
8bd2a248 | 456 | if (!hw_scan) { |
e229f844 | 457 | ieee80211_configure_filter(local); |
a344d677 | 458 | drv_sw_scan_complete(local, scan_sdata); |
aacde9ee | 459 | ieee80211_offchannel_return(local); |
e229f844 | 460 | } |
0a51b27e | 461 | |
5cff20e6 | 462 | ieee80211_recalc_idle(local); |
e229f844 | 463 | |
0a51b27e | 464 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 465 | ieee80211_ibss_notify_scan_completed(local); |
4fa11ec7 SK |
466 | |
467 | /* Requeue all the work that might have been ignored while | |
468 | * the scan was in progress; if there was none this will | |
469 | * just be a no-op for the particular interface. | |
470 | */ | |
471 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
472 | if (ieee80211_sdata_running(sdata)) | |
473 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); | |
474 | } | |
475 | ||
a2b70e83 EP |
476 | if (was_scanning) |
477 | ieee80211_start_next_roc(local); | |
0a51b27e | 478 | } |
8789d459 | 479 | |
7947d3e0 AS |
480 | void ieee80211_scan_completed(struct ieee80211_hw *hw, |
481 | struct cfg80211_scan_info *info) | |
8789d459 JB |
482 | { |
483 | struct ieee80211_local *local = hw_to_local(hw); | |
484 | ||
58bd7f11 | 485 | trace_api_scan_completed(local, info->aborted); |
8789d459 JB |
486 | |
487 | set_bit(SCAN_COMPLETED, &local->scanning); | |
7947d3e0 | 488 | if (info->aborted) |
8789d459 | 489 | set_bit(SCAN_ABORTED, &local->scanning); |
7947d3e0 AS |
490 | |
491 | memcpy(&local->scan_info, info, sizeof(*info)); | |
492 | ||
8789d459 JB |
493 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); |
494 | } | |
0a51b27e JB |
495 | EXPORT_SYMBOL(ieee80211_scan_completed); |
496 | ||
a344d677 JB |
497 | static int ieee80211_start_sw_scan(struct ieee80211_local *local, |
498 | struct ieee80211_sub_if_data *sdata) | |
f3b85252 | 499 | { |
fe57d9f5 JB |
500 | /* Software scan is not supported in multi-channel cases */ |
501 | if (local->use_chanctx) | |
502 | return -EOPNOTSUPP; | |
503 | ||
f3b85252 JB |
504 | /* |
505 | * Hardware/driver doesn't support hw_scan, so use software | |
506 | * scanning instead. First send a nullfunc frame with power save | |
507 | * bit on so that AP will buffer the frames for us while we are not | |
508 | * listening, then send probe requests to each channel and wait for | |
509 | * the responses. After all channels are scanned, tune back to the | |
510 | * original channel and send a nullfunc frame with power save bit | |
511 | * off to trigger the AP to send us all the buffered frames. | |
512 | * | |
513 | * Note that while local->sw_scanning is true everything else but | |
514 | * nullfunc frames and probe requests will be dropped in | |
515 | * ieee80211_tx_h_check_assoc(). | |
516 | */ | |
a344d677 | 517 | drv_sw_scan_start(local, sdata, local->scan_addr); |
f3b85252 | 518 | |
de312db3 | 519 | local->leave_oper_channel_time = jiffies; |
977923b0 | 520 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
521 | local->scan_channel_idx = 0; |
522 | ||
aacde9ee | 523 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 524 | |
9c35d7d2 | 525 | /* ensure nullfunc is transmitted before leaving operating channel */ |
3b24f4c6 | 526 | ieee80211_flush_queues(local, NULL, false); |
9c35d7d2 | 527 | |
3ac64bee | 528 | ieee80211_configure_filter(local); |
f3b85252 | 529 | |
59bdf3b0 BG |
530 | /* We need to set power level at maximum rate for scanning. */ |
531 | ieee80211_hw_config(local, 0); | |
532 | ||
42935eca | 533 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 534 | &local->scan_work, 0); |
f3b85252 JB |
535 | |
536 | return 0; | |
537 | } | |
538 | ||
dc0c18ed AK |
539 | static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata) |
540 | { | |
541 | struct ieee80211_local *local = sdata->local; | |
542 | struct ieee80211_sub_if_data *sdata_iter; | |
543 | ||
544 | if (!ieee80211_is_radar_required(local)) | |
545 | return true; | |
546 | ||
547 | if (!regulatory_pre_cac_allowed(local->hw.wiphy)) | |
548 | return false; | |
549 | ||
550 | mutex_lock(&local->iflist_mtx); | |
551 | list_for_each_entry(sdata_iter, &local->interfaces, list) { | |
552 | if (sdata_iter->wdev.cac_started) { | |
553 | mutex_unlock(&local->iflist_mtx); | |
554 | return false; | |
555 | } | |
556 | } | |
557 | mutex_unlock(&local->iflist_mtx); | |
558 | ||
559 | return true; | |
560 | } | |
561 | ||
133d40f9 SG |
562 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
563 | struct ieee80211_sub_if_data *sdata) | |
564 | { | |
dc0c18ed | 565 | if (!__ieee80211_can_leave_ch(sdata)) |
164eb02d SW |
566 | return false; |
567 | ||
2eb278e0 | 568 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
569 | return false; |
570 | ||
571 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
392b9ffb | 572 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
133d40f9 SG |
573 | return false; |
574 | ||
575 | return true; | |
576 | } | |
577 | ||
578 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
579 | { | |
580 | lockdep_assert_held(&local->mtx); | |
581 | ||
582 | if (!local->scan_req || local->scanning) | |
583 | return; | |
584 | ||
e2fd5dbc JB |
585 | if (!ieee80211_can_scan(local, |
586 | rcu_dereference_protected( | |
587 | local->scan_sdata, | |
588 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
589 | return; |
590 | ||
591 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
592 | round_jiffies_relative(0)); | |
593 | } | |
f3b85252 | 594 | |
45ad6834 JB |
595 | static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, |
596 | const u8 *src, const u8 *dst, | |
597 | const u8 *ssid, size_t ssid_len, | |
598 | const u8 *ie, size_t ie_len, | |
599 | u32 ratemask, u32 flags, u32 tx_flags, | |
600 | struct ieee80211_channel *channel) | |
601 | { | |
602 | struct sk_buff *skb; | |
603 | ||
604 | skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel, | |
605 | ssid, ssid_len, | |
606 | ie, ie_len, flags); | |
b9771d41 | 607 | |
45ad6834 | 608 | if (skb) { |
b9771d41 JB |
609 | if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { |
610 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
2b3dab13 | 611 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
b9771d41 JB |
612 | u16 sn = get_random_u32(); |
613 | ||
2b3dab13 | 614 | info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; |
b9771d41 JB |
615 | hdr->seq_ctrl = |
616 | cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); | |
617 | } | |
45ad6834 | 618 | IEEE80211_SKB_CB(skb)->flags |= tx_flags; |
08aca29a | 619 | ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band); |
45ad6834 JB |
620 | } |
621 | } | |
622 | ||
8a690674 BG |
623 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
624 | unsigned long *next_delay) | |
625 | { | |
626 | int i; | |
e2fd5dbc | 627 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 628 | struct cfg80211_scan_request *scan_req; |
57fbcce3 | 629 | enum nl80211_band band = local->hw.conf.chandef.chan->band; |
b9771d41 | 630 | u32 flags = 0, tx_flags; |
6c17b77b | 631 | |
6ea0a69c JB |
632 | scan_req = rcu_dereference_protected(local->scan_req, |
633 | lockdep_is_held(&local->mtx)); | |
634 | ||
6c17b77b | 635 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
6ea0a69c | 636 | if (scan_req->no_cck) |
6c17b77b | 637 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
b9771d41 JB |
638 | if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
639 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; | |
640 | if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) | |
641 | flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; | |
8a690674 | 642 | |
e2fd5dbc | 643 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 644 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 645 | |
6ea0a69c | 646 | for (i = 0; i < scan_req->n_ssids; i++) |
45ad6834 | 647 | ieee80211_send_scan_probe_req( |
e345f44f | 648 | sdata, local->scan_addr, scan_req->bssid, |
6ea0a69c JB |
649 | scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, |
650 | scan_req->ie, scan_req->ie_len, | |
b9771d41 | 651 | scan_req->rates[band], flags, |
45ad6834 | 652 | tx_flags, local->hw.conf.chandef.chan); |
8a690674 BG |
653 | |
654 | /* | |
655 | * After sending probe requests, wait for probe responses | |
656 | * on the channel. | |
657 | */ | |
658 | *next_delay = IEEE80211_CHANNEL_TIME; | |
659 | local->next_scan_state = SCAN_DECISION; | |
660 | } | |
661 | ||
f3b85252 JB |
662 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
663 | struct cfg80211_scan_request *req) | |
664 | { | |
665 | struct ieee80211_local *local = sdata->local; | |
e9da68dd | 666 | bool hw_scan = local->ops->hw_scan; |
f3b85252 JB |
667 | int rc; |
668 | ||
e229f844 SG |
669 | lockdep_assert_held(&local->mtx); |
670 | ||
dc0c18ed AK |
671 | if (local->scan_req) |
672 | return -EBUSY; | |
673 | ||
674 | if (!__ieee80211_can_leave_ch(sdata)) | |
f3b85252 JB |
675 | return -EBUSY; |
676 | ||
133d40f9 | 677 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 678 | /* wait for the work to finish/time out */ |
6ea0a69c | 679 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 680 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
681 | return 0; |
682 | } | |
683 | ||
e9da68dd JB |
684 | again: |
685 | if (hw_scan) { | |
f3b85252 | 686 | u8 *ies; |
f3b85252 | 687 | |
e4dcbb37 | 688 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
c56ef672 | 689 | |
30686bf7 | 690 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
c56ef672 DS |
691 | int i, n_bands = 0; |
692 | u8 bands_counted = 0; | |
693 | ||
694 | for (i = 0; i < req->n_channels; i++) { | |
695 | if (bands_counted & BIT(req->channels[i]->band)) | |
696 | continue; | |
697 | bands_counted |= BIT(req->channels[i]->band); | |
698 | n_bands++; | |
699 | } | |
700 | ||
701 | local->hw_scan_ies_bufsize *= n_bands; | |
702 | } | |
703 | ||
4d36ec58 JB |
704 | local->hw_scan_req = kmalloc( |
705 | sizeof(*local->hw_scan_req) + | |
706 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 707 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 708 | if (!local->hw_scan_req) |
f3b85252 JB |
709 | return -ENOMEM; |
710 | ||
c56ef672 DS |
711 | local->hw_scan_req->req.ssids = req->ssids; |
712 | local->hw_scan_req->req.n_ssids = req->n_ssids; | |
4d36ec58 JB |
713 | ies = (u8 *)local->hw_scan_req + |
714 | sizeof(*local->hw_scan_req) + | |
715 | req->n_channels * sizeof(req->channels[0]); | |
c56ef672 DS |
716 | local->hw_scan_req->req.ie = ies; |
717 | local->hw_scan_req->req.flags = req->flags; | |
e345f44f | 718 | eth_broadcast_addr(local->hw_scan_req->req.bssid); |
7947d3e0 AS |
719 | local->hw_scan_req->req.duration = req->duration; |
720 | local->hw_scan_req->req.duration_mandatory = | |
721 | req->duration_mandatory; | |
4d36ec58 JB |
722 | |
723 | local->hw_scan_band = 0; | |
c8cb5b85 TM |
724 | local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params; |
725 | local->hw_scan_req->req.scan_6ghz_params = | |
726 | req->scan_6ghz_params; | |
727 | local->hw_scan_req->req.scan_6ghz = req->scan_6ghz; | |
6e7e6213 JL |
728 | |
729 | /* | |
730 | * After allocating local->hw_scan_req, we must | |
731 | * go through until ieee80211_prep_hw_scan(), so | |
732 | * anything that might be changed here and leave | |
733 | * this function early must not go after this | |
734 | * allocation. | |
735 | */ | |
f3b85252 JB |
736 | } |
737 | ||
6ea0a69c | 738 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 739 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 740 | |
a344d677 JB |
741 | if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
742 | get_random_mask_addr(local->scan_addr, | |
743 | req->mac_addr, | |
744 | req->mac_addr_mask); | |
745 | else | |
746 | memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); | |
747 | ||
e9da68dd | 748 | if (hw_scan) { |
fbe9c429 | 749 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 750 | } else if ((req->n_channels == 1) && |
675a0b04 | 751 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
752 | /* |
753 | * If we are scanning only on the operating channel | |
754 | * then we do not need to stop normal activities | |
8a690674 BG |
755 | */ |
756 | unsigned long next_delay; | |
757 | ||
758 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
759 | ||
760 | ieee80211_recalc_idle(local); | |
761 | ||
762 | /* Notify driver scan is starting, keep order of operations | |
763 | * same as normal software scan, in case that matters. */ | |
a344d677 | 764 | drv_sw_scan_start(local, sdata, local->scan_addr); |
8a690674 BG |
765 | |
766 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
767 | ||
768 | /* We need to ensure power level is at max for scanning. */ | |
769 | ieee80211_hw_config(local, 0); | |
770 | ||
4e39ccac AQ |
771 | if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | |
772 | IEEE80211_CHAN_RADAR)) || | |
6ea0a69c | 773 | !req->n_ssids) { |
8a690674 BG |
774 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
775 | } else { | |
776 | ieee80211_scan_state_send_probe(local, &next_delay); | |
777 | next_delay = IEEE80211_CHANNEL_TIME; | |
778 | } | |
779 | ||
780 | /* Now, just wait a bit and we are all done! */ | |
781 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
782 | next_delay); | |
783 | return 0; | |
784 | } else { | |
785 | /* Do normal software scan */ | |
fbe9c429 | 786 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 787 | } |
6e7e6213 | 788 | |
5cff20e6 | 789 | ieee80211_recalc_idle(local); |
f3b85252 | 790 | |
e9da68dd | 791 | if (hw_scan) { |
2ad2274c | 792 | WARN_ON(!ieee80211_prep_hw_scan(sdata)); |
a060bbfe | 793 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
a344d677 JB |
794 | } else { |
795 | rc = ieee80211_start_sw_scan(local, sdata); | |
796 | } | |
f3b85252 | 797 | |
f3b85252 | 798 | if (rc) { |
4d36ec58 JB |
799 | kfree(local->hw_scan_req); |
800 | local->hw_scan_req = NULL; | |
fbe9c429 | 801 | local->scanning = 0; |
f3b85252 | 802 | |
5cff20e6 JB |
803 | ieee80211_recalc_idle(local); |
804 | ||
f3b85252 | 805 | local->scan_req = NULL; |
0c2bef46 | 806 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 JB |
807 | } |
808 | ||
e9da68dd JB |
809 | if (hw_scan && rc == 1) { |
810 | /* | |
811 | * we can't fall back to software for P2P-GO | |
812 | * as it must update NoA etc. | |
813 | */ | |
814 | if (ieee80211_vif_type_p2p(&sdata->vif) == | |
815 | NL80211_IFTYPE_P2P_GO) | |
816 | return -EOPNOTSUPP; | |
817 | hw_scan = false; | |
818 | goto again; | |
819 | } | |
820 | ||
f3b85252 JB |
821 | return rc; |
822 | } | |
823 | ||
df13cce5 HS |
824 | static unsigned long |
825 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
826 | { | |
827 | /* | |
828 | * TODO: channel switching also consumes quite some time, | |
829 | * add that delay as well to get a better estimation | |
830 | */ | |
4e39ccac | 831 | if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) |
df13cce5 HS |
832 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
833 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
834 | } | |
835 | ||
e229f844 SG |
836 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
837 | unsigned long *next_delay) | |
7d3be3cc | 838 | { |
142b9f50 | 839 | bool associated = false; |
df13cce5 HS |
840 | bool tx_empty = true; |
841 | bool bad_latency; | |
142b9f50 | 842 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 843 | struct ieee80211_channel *next_chan; |
cd2bb512 | 844 | enum mac80211_scan_state next_scan_state; |
6ea0a69c | 845 | struct cfg80211_scan_request *scan_req; |
142b9f50 | 846 | |
df13cce5 HS |
847 | /* |
848 | * check if at least one STA interface is associated, | |
849 | * check if at least one STA interface has pending tx frames | |
850 | * and grab the lowest used beacon interval | |
851 | */ | |
142b9f50 HS |
852 | mutex_lock(&local->iflist_mtx); |
853 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 854 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
855 | continue; |
856 | ||
857 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
858 | if (sdata->u.mgd.associated) { | |
859 | associated = true; | |
df13cce5 | 860 | |
df13cce5 HS |
861 | if (!qdisc_all_tx_empty(sdata->dev)) { |
862 | tx_empty = false; | |
863 | break; | |
864 | } | |
142b9f50 HS |
865 | } |
866 | } | |
867 | } | |
868 | mutex_unlock(&local->iflist_mtx); | |
869 | ||
6ea0a69c JB |
870 | scan_req = rcu_dereference_protected(local->scan_req, |
871 | lockdep_is_held(&local->mtx)); | |
872 | ||
873 | next_chan = scan_req->channels[local->scan_channel_idx]; | |
b23b025f | 874 | |
a80f7c0b | 875 | /* |
07ef03ee JB |
876 | * we're currently scanning a different channel, let's |
877 | * see if we can scan another channel without interfering | |
878 | * with the current traffic situation. | |
879 | * | |
3f892b61 | 880 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 881 | */ |
a80f7c0b | 882 | |
07ef03ee | 883 | bad_latency = time_after(jiffies + |
3f892b61 SG |
884 | ieee80211_scan_get_channel_time(next_chan), |
885 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 886 | |
cd2bb512 | 887 | if (associated && !tx_empty) { |
6ea0a69c | 888 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
cd2bb512 SL |
889 | next_scan_state = SCAN_ABORT; |
890 | else | |
891 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 892 | } else if (associated && bad_latency) { |
cd2bb512 SL |
893 | next_scan_state = SCAN_SUSPEND; |
894 | } else { | |
895 | next_scan_state = SCAN_SET_CHANNEL; | |
896 | } | |
897 | ||
898 | local->next_scan_state = next_scan_state; | |
142b9f50 | 899 | |
07ef03ee | 900 | *next_delay = 0; |
142b9f50 HS |
901 | } |
902 | ||
2fb3f028 HS |
903 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
904 | unsigned long *next_delay) | |
905 | { | |
906 | int skip; | |
907 | struct ieee80211_channel *chan; | |
7ca15a0a | 908 | enum nl80211_bss_scan_width oper_scan_width; |
6ea0a69c JB |
909 | struct cfg80211_scan_request *scan_req; |
910 | ||
911 | scan_req = rcu_dereference_protected(local->scan_req, | |
912 | lockdep_is_held(&local->mtx)); | |
2fb3f028 | 913 | |
7d3be3cc | 914 | skip = 0; |
6ea0a69c | 915 | chan = scan_req->channels[local->scan_channel_idx]; |
7d3be3cc | 916 | |
7ca15a0a SW |
917 | local->scan_chandef.chan = chan; |
918 | local->scan_chandef.center_freq1 = chan->center_freq; | |
b6011960 | 919 | local->scan_chandef.freq1_offset = chan->freq_offset; |
7ca15a0a | 920 | local->scan_chandef.center_freq2 = 0; |
75b15935 TP |
921 | |
922 | /* For scanning on the S1G band, ignore scan_width (which is constant | |
923 | * across all channels) for now since channel width is specific to each | |
924 | * channel. Detect the required channel width here and likely revisit | |
925 | * later. Maybe scan_width could be used to build the channel scan list? | |
926 | */ | |
927 | if (chan->band == NL80211_BAND_S1GHZ) { | |
928 | local->scan_chandef.width = ieee80211_s1g_channel_width(chan); | |
929 | goto set_channel; | |
930 | } | |
931 | ||
6ea0a69c | 932 | switch (scan_req->scan_width) { |
7ca15a0a SW |
933 | case NL80211_BSS_CHAN_WIDTH_5: |
934 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; | |
935 | break; | |
936 | case NL80211_BSS_CHAN_WIDTH_10: | |
937 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; | |
938 | break; | |
df78a0c0 | 939 | default: |
7ca15a0a SW |
940 | case NL80211_BSS_CHAN_WIDTH_20: |
941 | /* If scanning on oper channel, use whatever channel-type | |
942 | * is currently in use. | |
943 | */ | |
944 | oper_scan_width = cfg80211_chandef_to_scan_width( | |
945 | &local->_oper_chandef); | |
946 | if (chan == local->_oper_chandef.chan && | |
6ea0a69c | 947 | oper_scan_width == scan_req->scan_width) |
7ca15a0a SW |
948 | local->scan_chandef = local->_oper_chandef; |
949 | else | |
950 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; | |
951 | break; | |
75b15935 TP |
952 | case NL80211_BSS_CHAN_WIDTH_1: |
953 | case NL80211_BSS_CHAN_WIDTH_2: | |
954 | /* shouldn't get here, S1G handled above */ | |
955 | WARN_ON(1); | |
956 | break; | |
7ca15a0a | 957 | } |
b23b025f | 958 | |
75b15935 | 959 | set_channel: |
07ef03ee JB |
960 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
961 | skip = 1; | |
7d3be3cc | 962 | |
7d3be3cc HS |
963 | /* advance state machine to next channel/band */ |
964 | local->scan_channel_idx++; | |
965 | ||
0ee9c13c HS |
966 | if (skip) { |
967 | /* if we skip this channel return to the decision state */ | |
968 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 969 | return; |
0ee9c13c | 970 | } |
7d3be3cc HS |
971 | |
972 | /* | |
973 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
974 | * (which unfortunately doesn't say _why_ step a) is done, | |
975 | * but it waits for the probe delay or until a frame is | |
976 | * received - and the received frame would update the NAV). | |
977 | * For now, we do not support waiting until a frame is | |
978 | * received. | |
979 | * | |
980 | * In any case, it is not necessary for a passive scan. | |
981 | */ | |
4e39ccac AQ |
982 | if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || |
983 | !scan_req->n_ssids) { | |
7d3be3cc | 984 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
977923b0 | 985 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 986 | return; |
7d3be3cc HS |
987 | } |
988 | ||
2fb3f028 | 989 | /* active scan, send probes */ |
7d3be3cc | 990 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 991 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
992 | } |
993 | ||
07ef03ee JB |
994 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
995 | unsigned long *next_delay) | |
996 | { | |
997 | /* switch back to the operating channel */ | |
7ca15a0a | 998 | local->scan_chandef.chan = NULL; |
07ef03ee JB |
999 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
1000 | ||
aacde9ee SG |
1001 | /* disable PS */ |
1002 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
1003 | |
1004 | *next_delay = HZ / 5; | |
1005 | /* afterwards, resume scan & go to next channel */ | |
1006 | local->next_scan_state = SCAN_RESUME; | |
1007 | } | |
1008 | ||
1009 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
1010 | unsigned long *next_delay) | |
1011 | { | |
aacde9ee | 1012 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
1013 | |
1014 | if (local->ops->flush) { | |
3b24f4c6 | 1015 | ieee80211_flush_queues(local, NULL, false); |
07ef03ee JB |
1016 | *next_delay = 0; |
1017 | } else | |
1018 | *next_delay = HZ / 10; | |
1019 | ||
1020 | /* remember when we left the operating channel */ | |
1021 | local->leave_oper_channel_time = jiffies; | |
1022 | ||
1023 | /* advance to the next channel to be scanned */ | |
de2ee84d | 1024 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
1025 | } |
1026 | ||
c2b13452 | 1027 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
1028 | { |
1029 | struct ieee80211_local *local = | |
1030 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 1031 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 1032 | struct cfg80211_scan_request *scan_req; |
0a51b27e | 1033 | unsigned long next_delay = 0; |
8bd2a248 | 1034 | bool aborted; |
0a51b27e | 1035 | |
259b62e3 | 1036 | mutex_lock(&local->mtx); |
8789d459 | 1037 | |
332ff7fe LC |
1038 | if (!ieee80211_can_run_worker(local)) { |
1039 | aborted = true; | |
1040 | goto out_complete; | |
1041 | } | |
1042 | ||
e2fd5dbc JB |
1043 | sdata = rcu_dereference_protected(local->scan_sdata, |
1044 | lockdep_is_held(&local->mtx)); | |
6ea0a69c JB |
1045 | scan_req = rcu_dereference_protected(local->scan_req, |
1046 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 1047 | |
8a690674 BG |
1048 | /* When scanning on-channel, the first-callback means completed. */ |
1049 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
1050 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
1051 | goto out_complete; | |
1052 | } | |
1053 | ||
259b62e3 | 1054 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 1055 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 1056 | goto out_complete; |
8789d459 JB |
1057 | } |
1058 | ||
6ea0a69c | 1059 | if (!sdata || !scan_req) |
259b62e3 | 1060 | goto out; |
f3b85252 | 1061 | |
ff5db439 | 1062 | if (!local->scanning) { |
f3b85252 JB |
1063 | int rc; |
1064 | ||
6ea0a69c | 1065 | RCU_INIT_POINTER(local->scan_req, NULL); |
0c2bef46 | 1066 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 | 1067 | |
6ea0a69c | 1068 | rc = __ieee80211_start_scan(sdata, scan_req); |
259b62e3 | 1069 | if (rc) { |
3aed49ef | 1070 | /* need to complete scan in cfg80211 */ |
6ea0a69c | 1071 | rcu_assign_pointer(local->scan_req, scan_req); |
259b62e3 SG |
1072 | aborted = true; |
1073 | goto out_complete; | |
1074 | } else | |
1075 | goto out; | |
f3b85252 JB |
1076 | } |
1077 | ||
f502d09b HS |
1078 | /* |
1079 | * as long as no delay is required advance immediately | |
1080 | * without scheduling a new work | |
1081 | */ | |
1082 | do { | |
c29acf20 RM |
1083 | if (!ieee80211_sdata_running(sdata)) { |
1084 | aborted = true; | |
1085 | goto out_complete; | |
1086 | } | |
1087 | ||
977923b0 | 1088 | switch (local->next_scan_state) { |
2fb3f028 | 1089 | case SCAN_DECISION: |
e229f844 | 1090 | /* if no more bands/channels left, complete scan */ |
6ea0a69c | 1091 | if (local->scan_channel_idx >= scan_req->n_channels) { |
e229f844 SG |
1092 | aborted = false; |
1093 | goto out_complete; | |
1094 | } | |
1095 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 1096 | break; |
2fb3f028 HS |
1097 | case SCAN_SET_CHANNEL: |
1098 | ieee80211_scan_state_set_channel(local, &next_delay); | |
1099 | break; | |
f502d09b HS |
1100 | case SCAN_SEND_PROBE: |
1101 | ieee80211_scan_state_send_probe(local, &next_delay); | |
1102 | break; | |
07ef03ee JB |
1103 | case SCAN_SUSPEND: |
1104 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 1105 | break; |
07ef03ee JB |
1106 | case SCAN_RESUME: |
1107 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 1108 | break; |
cd2bb512 SL |
1109 | case SCAN_ABORT: |
1110 | aborted = true; | |
1111 | goto out_complete; | |
f502d09b HS |
1112 | } |
1113 | } while (next_delay == 0); | |
0a51b27e | 1114 | |
42935eca | 1115 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 1116 | goto out; |
259b62e3 SG |
1117 | |
1118 | out_complete: | |
8bd2a248 | 1119 | __ieee80211_scan_completed(&local->hw, aborted); |
259b62e3 SG |
1120 | out: |
1121 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
1122 | } |
1123 | ||
f3b85252 JB |
1124 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
1125 | struct cfg80211_scan_request *req) | |
0a51b27e | 1126 | { |
f3b85252 | 1127 | int res; |
de95a54b | 1128 | |
a1699b75 | 1129 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 1130 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 1131 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 1132 | |
f3b85252 | 1133 | return res; |
0a51b27e JB |
1134 | } |
1135 | ||
34bcf715 SG |
1136 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
1137 | const u8 *ssid, u8 ssid_len, | |
76bed0f4 JD |
1138 | struct ieee80211_channel **channels, |
1139 | unsigned int n_channels, | |
7ca15a0a | 1140 | enum nl80211_bss_scan_width scan_width) |
0a51b27e | 1141 | { |
0a51b27e | 1142 | struct ieee80211_local *local = sdata->local; |
76bed0f4 | 1143 | int ret = -EBUSY, i, n_ch = 0; |
57fbcce3 | 1144 | enum nl80211_band band; |
2a519311 | 1145 | |
a1699b75 | 1146 | mutex_lock(&local->mtx); |
0a51b27e | 1147 | |
f3b85252 JB |
1148 | /* busy scanning */ |
1149 | if (local->scan_req) | |
1150 | goto unlock; | |
9116dd01 | 1151 | |
be4a4b6a | 1152 | /* fill internal scan request */ |
76bed0f4 JD |
1153 | if (!channels) { |
1154 | int max_n; | |
be4a4b6a | 1155 | |
57fbcce3 | 1156 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
c8cb5b85 TM |
1157 | if (!local->hw.wiphy->bands[band] || |
1158 | band == NL80211_BAND_6GHZ) | |
be4a4b6a | 1159 | continue; |
34bcf715 SG |
1160 | |
1161 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
1162 | for (i = 0; i < max_n; i++) { | |
1163 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 1164 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 | 1165 | |
8fe02e16 | 1166 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
1167 | IEEE80211_CHAN_DISABLED)) |
1168 | continue; | |
1169 | ||
1170 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
1171 | n_ch++; | |
be4a4b6a JB |
1172 | } |
1173 | } | |
1174 | ||
34bcf715 SG |
1175 | if (WARN_ON_ONCE(n_ch == 0)) |
1176 | goto unlock; | |
1177 | ||
1178 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 1179 | } else { |
76bed0f4 JD |
1180 | for (i = 0; i < n_channels; i++) { |
1181 | if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | | |
1182 | IEEE80211_CHAN_DISABLED)) | |
1183 | continue; | |
1184 | ||
1185 | local->int_scan_req->channels[n_ch] = channels[i]; | |
1186 | n_ch++; | |
1187 | } | |
1188 | ||
1189 | if (WARN_ON_ONCE(n_ch == 0)) | |
34bcf715 SG |
1190 | goto unlock; |
1191 | ||
76bed0f4 | 1192 | local->int_scan_req->n_channels = n_ch; |
be4a4b6a JB |
1193 | } |
1194 | ||
1195 | local->int_scan_req->ssids = &local->scan_ssid; | |
1196 | local->int_scan_req->n_ssids = 1; | |
7ca15a0a | 1197 | local->int_scan_req->scan_width = scan_width; |
5ba63533 JB |
1198 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
1199 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 1200 | |
5ba63533 | 1201 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 1202 | unlock: |
a1699b75 | 1203 | mutex_unlock(&local->mtx); |
f3b85252 | 1204 | return ret; |
0a51b27e | 1205 | } |
5bb644a0 | 1206 | |
4136c422 SG |
1207 | /* |
1208 | * Only call this function when a scan can't be queued -- under RTNL. | |
1209 | */ | |
5bb644a0 JB |
1210 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
1211 | { | |
5bb644a0 | 1212 | /* |
b856439b | 1213 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
1214 | * yet really started (see __ieee80211_start_scan ). |
1215 | * | |
1216 | * Regarding hardware scan: | |
1217 | * - we can not call __ieee80211_scan_completed() as when | |
1218 | * SCAN_HW_SCANNING bit is set this function change | |
1219 | * local->hw_scan_req to operate on 5G band, what race with | |
1220 | * driver which can use local->hw_scan_req | |
1221 | * | |
1222 | * - we can not cancel scan_work since driver can schedule it | |
1223 | * by ieee80211_scan_completed(..., true) to finish scan | |
1224 | * | |
b856439b EP |
1225 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
1226 | * driver is still responsible for calling ieee80211_scan_completed() | |
1227 | * after the scan was completed/aborted. | |
5bb644a0 | 1228 | */ |
4136c422 | 1229 | |
a1699b75 | 1230 | mutex_lock(&local->mtx); |
b856439b EP |
1231 | if (!local->scan_req) |
1232 | goto out; | |
1233 | ||
a754055a EG |
1234 | /* |
1235 | * We have a scan running and the driver already reported completion, | |
1236 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
1237 | * cancelled. | |
1238 | */ | |
1239 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
1240 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
1241 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
1242 | goto out; | |
1243 | } | |
1244 | ||
b856439b | 1245 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
a754055a EG |
1246 | /* |
1247 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
1248 | * scan on another band. | |
1249 | */ | |
1250 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 1251 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
1252 | drv_cancel_hw_scan(local, |
1253 | rcu_dereference_protected(local->scan_sdata, | |
1254 | lockdep_is_held(&local->mtx))); | |
b856439b | 1255 | goto out; |
4136c422 | 1256 | } |
b856439b EP |
1257 | |
1258 | /* | |
1259 | * If the work is currently running, it must be blocked on | |
1260 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
1261 | * simply exit once it acquires the mutex. | |
1262 | */ | |
1263 | cancel_delayed_work(&local->scan_work); | |
1264 | /* and clean up */ | |
7947d3e0 | 1265 | memset(&local->scan_info, 0, sizeof(local->scan_info)); |
8bd2a248 | 1266 | __ieee80211_scan_completed(&local->hw, true); |
b856439b | 1267 | out: |
d07bfd8b | 1268 | mutex_unlock(&local->mtx); |
5bb644a0 | 1269 | } |
79f460ca | 1270 | |
d43c6b6e DS |
1271 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1272 | struct cfg80211_sched_scan_request *req) | |
79f460ca LC |
1273 | { |
1274 | struct ieee80211_local *local = sdata->local; | |
633e2713 | 1275 | struct ieee80211_scan_ies sched_scan_ies = {}; |
2103dec1 | 1276 | struct cfg80211_chan_def chandef; |
633e2713 | 1277 | int ret, i, iebufsz, num_bands = 0; |
57fbcce3 | 1278 | u32 rate_masks[NUM_NL80211_BANDS] = {}; |
633e2713 DS |
1279 | u8 bands_used = 0; |
1280 | u8 *ie; | |
b9771d41 | 1281 | u32 flags = 0; |
c604b9f2 | 1282 | |
e4dcbb37 | 1283 | iebufsz = local->scan_ies_len + req->ie_len; |
79f460ca | 1284 | |
d43c6b6e | 1285 | lockdep_assert_held(&local->mtx); |
79f460ca | 1286 | |
d43c6b6e DS |
1287 | if (!local->ops->sched_scan_start) |
1288 | return -ENOTSUPP; | |
79f460ca | 1289 | |
57fbcce3 | 1290 | for (i = 0; i < NUM_NL80211_BANDS; i++) { |
633e2713 DS |
1291 | if (local->hw.wiphy->bands[i]) { |
1292 | bands_used |= BIT(i); | |
1293 | rate_masks[i] = (u32) -1; | |
1294 | num_bands++; | |
79f460ca | 1295 | } |
633e2713 | 1296 | } |
79f460ca | 1297 | |
b9771d41 JB |
1298 | if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
1299 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; | |
1300 | ||
6396bb22 | 1301 | ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); |
633e2713 DS |
1302 | if (!ie) { |
1303 | ret = -ENOMEM; | |
1304 | goto out; | |
79f460ca LC |
1305 | } |
1306 | ||
633e2713 DS |
1307 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
1308 | ||
2ad2274c | 1309 | ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz, |
cd5861bd | 1310 | &sched_scan_ies, req->ie, |
00387f32 | 1311 | req->ie_len, bands_used, rate_masks, &chandef, |
b9771d41 | 1312 | flags); |
633e2713 | 1313 | |
30dd3edf | 1314 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
d43c6b6e | 1315 | if (ret == 0) { |
5260a5b2 | 1316 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
6ea0a69c | 1317 | rcu_assign_pointer(local->sched_scan_req, req); |
d43c6b6e | 1318 | } |
79f460ca | 1319 | |
633e2713 | 1320 | kfree(ie); |
d43c6b6e | 1321 | |
633e2713 | 1322 | out: |
d43c6b6e DS |
1323 | if (ret) { |
1324 | /* Clean in case of failure after HW restart or upon resume. */ | |
0c2bef46 | 1325 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
6ea0a69c | 1326 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e DS |
1327 | } |
1328 | ||
1329 | return ret; | |
1330 | } | |
1331 | ||
1332 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
1333 | struct cfg80211_sched_scan_request *req) | |
1334 | { | |
1335 | struct ieee80211_local *local = sdata->local; | |
1336 | int ret; | |
1337 | ||
1338 | mutex_lock(&local->mtx); | |
1339 | ||
1340 | if (rcu_access_pointer(local->sched_scan_sdata)) { | |
1341 | mutex_unlock(&local->mtx); | |
1342 | return -EBUSY; | |
1343 | } | |
1344 | ||
1345 | ret = __ieee80211_request_sched_scan_start(sdata, req); | |
1346 | ||
5260a5b2 | 1347 | mutex_unlock(&local->mtx); |
79f460ca LC |
1348 | return ret; |
1349 | } | |
1350 | ||
0d440ea2 | 1351 | int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) |
79f460ca | 1352 | { |
0d440ea2 EP |
1353 | struct ieee80211_sub_if_data *sched_scan_sdata; |
1354 | int ret = -ENOENT; | |
79f460ca | 1355 | |
5260a5b2 | 1356 | mutex_lock(&local->mtx); |
79f460ca LC |
1357 | |
1358 | if (!local->ops->sched_scan_stop) { | |
1359 | ret = -ENOTSUPP; | |
1360 | goto out; | |
1361 | } | |
1362 | ||
d43c6b6e | 1363 | /* We don't want to restart sched scan anymore. */ |
6ea0a69c | 1364 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1365 | |
0d440ea2 EP |
1366 | sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, |
1367 | lockdep_is_held(&local->mtx)); | |
1368 | if (sched_scan_sdata) { | |
1369 | ret = drv_sched_scan_stop(local, sched_scan_sdata); | |
71228a1e | 1370 | if (!ret) |
ad053a96 | 1371 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
71228a1e | 1372 | } |
79f460ca | 1373 | out: |
5260a5b2 | 1374 | mutex_unlock(&local->mtx); |
79f460ca LC |
1375 | |
1376 | return ret; | |
1377 | } | |
1378 | ||
1379 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1380 | { | |
1381 | struct ieee80211_local *local = hw_to_local(hw); | |
1382 | ||
1383 | trace_api_sched_scan_results(local); | |
1384 | ||
b34939b9 | 1385 | cfg80211_sched_scan_results(hw->wiphy, 0); |
79f460ca LC |
1386 | } |
1387 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1388 | ||
f6837ba8 | 1389 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
85a9994a | 1390 | { |
85a9994a LC |
1391 | mutex_lock(&local->mtx); |
1392 | ||
5260a5b2 | 1393 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1394 | mutex_unlock(&local->mtx); |
1395 | return; | |
1396 | } | |
1397 | ||
0c2bef46 | 1398 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
85a9994a | 1399 | |
d43c6b6e | 1400 | /* If sched scan was aborted by the driver. */ |
6ea0a69c | 1401 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1402 | |
85a9994a LC |
1403 | mutex_unlock(&local->mtx); |
1404 | ||
b34939b9 | 1405 | cfg80211_sched_scan_stopped(local->hw.wiphy, 0); |
85a9994a LC |
1406 | } |
1407 | ||
f6837ba8 JB |
1408 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1409 | { | |
1410 | struct ieee80211_local *local = | |
1411 | container_of(work, struct ieee80211_local, | |
1412 | sched_scan_stopped_work); | |
1413 | ||
1414 | ieee80211_sched_scan_end(local); | |
1415 | } | |
1416 | ||
79f460ca LC |
1417 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1418 | { | |
1419 | struct ieee80211_local *local = hw_to_local(hw); | |
1420 | ||
1421 | trace_api_sched_scan_stopped(local); | |
1422 | ||
2bc533bd EP |
1423 | /* |
1424 | * this shouldn't really happen, so for simplicity | |
1425 | * simply ignore it, and let mac80211 reconfigure | |
1426 | * the sched scan later on. | |
1427 | */ | |
1428 | if (local->in_reconfig) | |
1429 | return; | |
1430 | ||
18db594a | 1431 | schedule_work(&local->sched_scan_stopped_work); |
79f460ca LC |
1432 | } |
1433 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |