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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 |
4abb52a4 | 12 | * Copyright (C) 2018-2019 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 | } | |
135 | } | |
136 | ||
c2b13452 | 137 | struct ieee80211_bss * |
5484e237 JB |
138 | ieee80211_bss_info_update(struct ieee80211_local *local, |
139 | struct ieee80211_rx_status *rx_status, | |
d45c4172 | 140 | struct ieee80211_mgmt *mgmt, size_t len, |
d45c4172 | 141 | struct ieee80211_channel *channel) |
5484e237 | 142 | { |
d45c4172 | 143 | bool beacon = ieee80211_is_beacon(mgmt->frame_control); |
78ac51f8 SS |
144 | struct cfg80211_bss *cbss, *non_tx_cbss; |
145 | struct ieee80211_bss *bss, *non_tx_bss; | |
162dd6a7 JB |
146 | struct cfg80211_inform_bss bss_meta = { |
147 | .boottime_ns = rx_status->boottime_ns, | |
148 | }; | |
74d803b6 | 149 | bool signal_valid; |
7947d3e0 | 150 | struct ieee80211_sub_if_data *scan_sdata; |
4abb52a4 SS |
151 | struct ieee802_11_elems elems; |
152 | size_t baselen; | |
153 | u8 *elements; | |
2a519311 | 154 | |
1ad22fb5 T |
155 | if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL) |
156 | bss_meta.signal = 0; /* invalid signal indication */ | |
157 | else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) | |
61f6bba0 | 158 | bss_meta.signal = rx_status->signal * 100; |
30686bf7 | 159 | else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) |
61f6bba0 | 160 | bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 161 | |
61f6bba0 | 162 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20; |
da6a4352 | 163 | if (rx_status->bw == RATE_INFO_BW_5) |
61f6bba0 | 164 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5; |
da6a4352 | 165 | else if (rx_status->bw == RATE_INFO_BW_10) |
61f6bba0 | 166 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10; |
7ca15a0a | 167 | |
61f6bba0 | 168 | bss_meta.chan = channel; |
7947d3e0 AS |
169 | |
170 | rcu_read_lock(); | |
171 | scan_sdata = rcu_dereference(local->scan_sdata); | |
172 | if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION && | |
173 | scan_sdata->vif.bss_conf.assoc && | |
174 | ieee80211_have_rx_timestamp(rx_status)) { | |
175 | bss_meta.parent_tsf = | |
176 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
177 | len + FCS_LEN, 24); | |
178 | ether_addr_copy(bss_meta.parent_bssid, | |
179 | scan_sdata->vif.bss_conf.bssid); | |
180 | } | |
181 | rcu_read_unlock(); | |
182 | ||
61f6bba0 JB |
183 | cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, |
184 | mgmt, len, GFP_ATOMIC); | |
0c1ad2ca | 185 | if (!cbss) |
00d3f14c | 186 | return NULL; |
4abb52a4 SS |
187 | |
188 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { | |
189 | elements = mgmt->u.probe_resp.variable; | |
190 | baselen = offsetof(struct ieee80211_mgmt, | |
191 | u.probe_resp.variable); | |
192 | } else { | |
193 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); | |
194 | elements = mgmt->u.beacon.variable; | |
195 | } | |
196 | ||
197 | if (baselen > len) | |
198 | return NULL; | |
199 | ||
200 | ieee802_11_parse_elems(elements, len - baselen, false, &elems, | |
201 | mgmt->bssid, cbss->bssid); | |
202 | ||
74d803b6 | 203 | /* In case the signal is invalid update the status */ |
7bb106eb | 204 | signal_valid = channel == cbss->channel; |
74d803b6 SS |
205 | if (!signal_valid) |
206 | rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; | |
00d3f14c | 207 | |
0c1ad2ca | 208 | bss = (void *)cbss->priv; |
fcea7db5 | 209 | ieee80211_update_bss_from_elems(local, bss, &elems, rx_status, beacon); |
817cee76 | 210 | |
78ac51f8 SS |
211 | list_for_each_entry(non_tx_cbss, &cbss->nontrans_list, nontrans_list) { |
212 | non_tx_bss = (void *)non_tx_cbss->priv; | |
213 | ||
214 | ieee80211_update_bss_from_elems(local, non_tx_bss, &elems, | |
215 | rx_status, beacon); | |
216 | } | |
217 | ||
5484e237 JB |
218 | return bss; |
219 | } | |
0a51b27e | 220 | |
40b0bd24 RZ |
221 | static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata, |
222 | u32 scan_flags, const u8 *da) | |
223 | { | |
224 | if (!sdata) | |
225 | return false; | |
226 | /* accept broadcast for OCE */ | |
227 | if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP && | |
228 | is_broadcast_ether_addr(da)) | |
229 | return true; | |
230 | if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR) | |
231 | return true; | |
232 | return ether_addr_equal(da, sdata->vif.addr); | |
233 | } | |
234 | ||
d48b2968 | 235 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 236 | { |
f1d58c25 | 237 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
238 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
239 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 240 | struct ieee80211_bss *bss; |
98c8fccf | 241 | struct ieee80211_channel *channel; |
98c8fccf | 242 | |
d48b2968 JB |
243 | if (skb->len < 24 || |
244 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
245 | !ieee80211_is_beacon(mgmt->frame_control))) | |
246 | return; | |
98c8fccf | 247 | |
d48b2968 JB |
248 | sdata1 = rcu_dereference(local->scan_sdata); |
249 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 250 | |
d48b2968 JB |
251 | if (likely(!sdata1 && !sdata2)) |
252 | return; | |
98c8fccf | 253 | |
d48b2968 | 254 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
a344d677 JB |
255 | struct cfg80211_scan_request *scan_req; |
256 | struct cfg80211_sched_scan_request *sched_scan_req; | |
40b0bd24 | 257 | u32 scan_req_flags = 0, sched_scan_req_flags = 0; |
a344d677 JB |
258 | |
259 | scan_req = rcu_dereference(local->scan_req); | |
260 | sched_scan_req = rcu_dereference(local->sched_scan_req); | |
261 | ||
40b0bd24 RZ |
262 | if (scan_req) |
263 | scan_req_flags = scan_req->flags; | |
264 | ||
265 | if (sched_scan_req) | |
266 | sched_scan_req_flags = sched_scan_req->flags; | |
267 | ||
268 | /* ignore ProbeResp to foreign address or non-bcast (OCE) | |
269 | * unless scanning with randomised address | |
a344d677 | 270 | */ |
40b0bd24 RZ |
271 | if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags, |
272 | mgmt->da) && | |
273 | !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags, | |
274 | mgmt->da)) | |
d48b2968 | 275 | return; |
98c8fccf JB |
276 | } |
277 | ||
3b23c184 TP |
278 | channel = ieee80211_get_channel_khz(local->hw.wiphy, |
279 | ieee80211_rx_status_to_khz(rx_status)); | |
98c8fccf JB |
280 | |
281 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 282 | return; |
98c8fccf | 283 | |
d48b2968 | 284 | bss = ieee80211_bss_info_update(local, rx_status, |
4abb52a4 | 285 | mgmt, skb->len, |
d45c4172 | 286 | channel); |
d048e503 | 287 | if (bss) |
d48b2968 | 288 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
289 | } |
290 | ||
2103dec1 SW |
291 | static void |
292 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, | |
293 | enum nl80211_bss_scan_width scan_width) | |
294 | { | |
295 | memset(chandef, 0, sizeof(*chandef)); | |
296 | switch (scan_width) { | |
297 | case NL80211_BSS_CHAN_WIDTH_5: | |
298 | chandef->width = NL80211_CHAN_WIDTH_5; | |
299 | break; | |
300 | case NL80211_BSS_CHAN_WIDTH_10: | |
301 | chandef->width = NL80211_CHAN_WIDTH_10; | |
302 | break; | |
303 | default: | |
304 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
305 | break; | |
306 | } | |
307 | } | |
308 | ||
4d36ec58 JB |
309 | /* return false if no more work */ |
310 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
311 | { | |
6ea0a69c | 312 | struct cfg80211_scan_request *req; |
2103dec1 | 313 | struct cfg80211_chan_def chandef; |
c56ef672 | 314 | u8 bands_used = 0; |
4d36ec58 | 315 | int i, ielen, n_chans; |
b9771d41 | 316 | u32 flags = 0; |
4d36ec58 | 317 | |
6ea0a69c JB |
318 | req = rcu_dereference_protected(local->scan_req, |
319 | lockdep_is_held(&local->mtx)); | |
320 | ||
a754055a EG |
321 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
322 | return false; | |
323 | ||
30686bf7 | 324 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
4d36ec58 | 325 | for (i = 0; i < req->n_channels; i++) { |
c56ef672 DS |
326 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
327 | bands_used |= BIT(req->channels[i]->band); | |
328 | } | |
329 | ||
330 | n_chans = req->n_channels; | |
331 | } else { | |
332 | do { | |
57fbcce3 | 333 | if (local->hw_scan_band == NUM_NL80211_BANDS) |
c56ef672 DS |
334 | return false; |
335 | ||
336 | n_chans = 0; | |
337 | ||
338 | for (i = 0; i < req->n_channels; i++) { | |
339 | if (req->channels[i]->band != | |
340 | local->hw_scan_band) | |
341 | continue; | |
342 | local->hw_scan_req->req.channels[n_chans] = | |
4d36ec58 JB |
343 | req->channels[i]; |
344 | n_chans++; | |
c56ef672 | 345 | bands_used |= BIT(req->channels[i]->band); |
4d36ec58 | 346 | } |
4d36ec58 | 347 | |
c56ef672 DS |
348 | local->hw_scan_band++; |
349 | } while (!n_chans); | |
350 | } | |
4d36ec58 | 351 | |
c56ef672 | 352 | local->hw_scan_req->req.n_channels = n_chans; |
2103dec1 | 353 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
4d36ec58 | 354 | |
b9771d41 JB |
355 | if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
356 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; | |
357 | ||
c56ef672 DS |
358 | ielen = ieee80211_build_preq_ies(local, |
359 | (u8 *)local->hw_scan_req->req.ie, | |
c604b9f2 | 360 | local->hw_scan_ies_bufsize, |
c56ef672 DS |
361 | &local->hw_scan_req->ies, |
362 | req->ie, req->ie_len, | |
b9771d41 JB |
363 | bands_used, req->rates, &chandef, |
364 | flags); | |
c56ef672 DS |
365 | local->hw_scan_req->req.ie_len = ielen; |
366 | local->hw_scan_req->req.no_cck = req->no_cck; | |
a344d677 JB |
367 | ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); |
368 | ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, | |
369 | req->mac_addr_mask); | |
e345f44f | 370 | ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); |
4d36ec58 JB |
371 | |
372 | return true; | |
373 | } | |
374 | ||
8bd2a248 | 375 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
376 | { |
377 | struct ieee80211_local *local = hw_to_local(hw); | |
e9da68dd | 378 | bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
a2b70e83 | 379 | bool was_scanning = local->scanning; |
6ea0a69c | 380 | struct cfg80211_scan_request *scan_req; |
a344d677 | 381 | struct ieee80211_sub_if_data *scan_sdata; |
4fa11ec7 | 382 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 383 | |
e229f844 | 384 | lockdep_assert_held(&local->mtx); |
5bc75728 | 385 | |
6d3560d4 JB |
386 | /* |
387 | * It's ok to abort a not-yet-running scan (that | |
388 | * we have one at all will be verified by checking | |
389 | * local->scan_req next), but not to complete it | |
390 | * successfully. | |
391 | */ | |
392 | if (WARN_ON(!local->scanning && !aborted)) | |
393 | aborted = true; | |
5bc75728 | 394 | |
e229f844 | 395 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 396 | return; |
de95a54b | 397 | |
c56ef672 | 398 | if (hw_scan && !aborted && |
30686bf7 | 399 | !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && |
c56ef672 | 400 | ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
401 | int rc; |
402 | ||
403 | rc = drv_hw_scan(local, | |
404 | rcu_dereference_protected(local->scan_sdata, | |
405 | lockdep_is_held(&local->mtx)), | |
406 | local->hw_scan_req); | |
407 | ||
6eb11a9a | 408 | if (rc == 0) |
d07bfd8b | 409 | return; |
7947d3e0 | 410 | |
7d10f6b1 JB |
411 | /* HW scan failed and is going to be reported as aborted, |
412 | * so clear old scan info. | |
7947d3e0 AS |
413 | */ |
414 | memset(&local->scan_info, 0, sizeof(local->scan_info)); | |
7d10f6b1 | 415 | aborted = true; |
4d36ec58 JB |
416 | } |
417 | ||
418 | kfree(local->hw_scan_req); | |
419 | local->hw_scan_req = NULL; | |
f3b85252 | 420 | |
6ea0a69c JB |
421 | scan_req = rcu_dereference_protected(local->scan_req, |
422 | lockdep_is_held(&local->mtx)); | |
423 | ||
1d76250b | 424 | if (scan_req != local->int_scan_req) { |
7947d3e0 AS |
425 | local->scan_info.aborted = aborted; |
426 | cfg80211_scan_done(scan_req, &local->scan_info); | |
1d76250b | 427 | } |
6ea0a69c | 428 | RCU_INIT_POINTER(local->scan_req, NULL); |
a344d677 JB |
429 | |
430 | scan_sdata = rcu_dereference_protected(local->scan_sdata, | |
431 | lockdep_is_held(&local->mtx)); | |
0c2bef46 | 432 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
2a519311 | 433 | |
fbe9c429 | 434 | local->scanning = 0; |
7ca15a0a | 435 | local->scan_chandef.chan = NULL; |
f3b85252 | 436 | |
07ef03ee JB |
437 | /* Set power back to normal operating levels. */ |
438 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 439 | |
8bd2a248 | 440 | if (!hw_scan) { |
e229f844 | 441 | ieee80211_configure_filter(local); |
a344d677 | 442 | drv_sw_scan_complete(local, scan_sdata); |
aacde9ee | 443 | ieee80211_offchannel_return(local); |
e229f844 | 444 | } |
0a51b27e | 445 | |
5cff20e6 | 446 | ieee80211_recalc_idle(local); |
e229f844 | 447 | |
0a51b27e | 448 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 449 | ieee80211_ibss_notify_scan_completed(local); |
4fa11ec7 SK |
450 | |
451 | /* Requeue all the work that might have been ignored while | |
452 | * the scan was in progress; if there was none this will | |
453 | * just be a no-op for the particular interface. | |
454 | */ | |
455 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
456 | if (ieee80211_sdata_running(sdata)) | |
457 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); | |
458 | } | |
459 | ||
a2b70e83 EP |
460 | if (was_scanning) |
461 | ieee80211_start_next_roc(local); | |
0a51b27e | 462 | } |
8789d459 | 463 | |
7947d3e0 AS |
464 | void ieee80211_scan_completed(struct ieee80211_hw *hw, |
465 | struct cfg80211_scan_info *info) | |
8789d459 JB |
466 | { |
467 | struct ieee80211_local *local = hw_to_local(hw); | |
468 | ||
58bd7f11 | 469 | trace_api_scan_completed(local, info->aborted); |
8789d459 JB |
470 | |
471 | set_bit(SCAN_COMPLETED, &local->scanning); | |
7947d3e0 | 472 | if (info->aborted) |
8789d459 | 473 | set_bit(SCAN_ABORTED, &local->scanning); |
7947d3e0 AS |
474 | |
475 | memcpy(&local->scan_info, info, sizeof(*info)); | |
476 | ||
8789d459 JB |
477 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); |
478 | } | |
0a51b27e JB |
479 | EXPORT_SYMBOL(ieee80211_scan_completed); |
480 | ||
a344d677 JB |
481 | static int ieee80211_start_sw_scan(struct ieee80211_local *local, |
482 | struct ieee80211_sub_if_data *sdata) | |
f3b85252 | 483 | { |
fe57d9f5 JB |
484 | /* Software scan is not supported in multi-channel cases */ |
485 | if (local->use_chanctx) | |
486 | return -EOPNOTSUPP; | |
487 | ||
f3b85252 JB |
488 | /* |
489 | * Hardware/driver doesn't support hw_scan, so use software | |
490 | * scanning instead. First send a nullfunc frame with power save | |
491 | * bit on so that AP will buffer the frames for us while we are not | |
492 | * listening, then send probe requests to each channel and wait for | |
493 | * the responses. After all channels are scanned, tune back to the | |
494 | * original channel and send a nullfunc frame with power save bit | |
495 | * off to trigger the AP to send us all the buffered frames. | |
496 | * | |
497 | * Note that while local->sw_scanning is true everything else but | |
498 | * nullfunc frames and probe requests will be dropped in | |
499 | * ieee80211_tx_h_check_assoc(). | |
500 | */ | |
a344d677 | 501 | drv_sw_scan_start(local, sdata, local->scan_addr); |
f3b85252 | 502 | |
de312db3 | 503 | local->leave_oper_channel_time = jiffies; |
977923b0 | 504 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
505 | local->scan_channel_idx = 0; |
506 | ||
aacde9ee | 507 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 508 | |
9c35d7d2 | 509 | /* ensure nullfunc is transmitted before leaving operating channel */ |
3b24f4c6 | 510 | ieee80211_flush_queues(local, NULL, false); |
9c35d7d2 | 511 | |
3ac64bee | 512 | ieee80211_configure_filter(local); |
f3b85252 | 513 | |
59bdf3b0 BG |
514 | /* We need to set power level at maximum rate for scanning. */ |
515 | ieee80211_hw_config(local, 0); | |
516 | ||
42935eca | 517 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 518 | &local->scan_work, 0); |
f3b85252 JB |
519 | |
520 | return 0; | |
521 | } | |
522 | ||
dc0c18ed AK |
523 | static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata) |
524 | { | |
525 | struct ieee80211_local *local = sdata->local; | |
526 | struct ieee80211_sub_if_data *sdata_iter; | |
527 | ||
528 | if (!ieee80211_is_radar_required(local)) | |
529 | return true; | |
530 | ||
531 | if (!regulatory_pre_cac_allowed(local->hw.wiphy)) | |
532 | return false; | |
533 | ||
534 | mutex_lock(&local->iflist_mtx); | |
535 | list_for_each_entry(sdata_iter, &local->interfaces, list) { | |
536 | if (sdata_iter->wdev.cac_started) { | |
537 | mutex_unlock(&local->iflist_mtx); | |
538 | return false; | |
539 | } | |
540 | } | |
541 | mutex_unlock(&local->iflist_mtx); | |
542 | ||
543 | return true; | |
544 | } | |
545 | ||
133d40f9 SG |
546 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
547 | struct ieee80211_sub_if_data *sdata) | |
548 | { | |
dc0c18ed | 549 | if (!__ieee80211_can_leave_ch(sdata)) |
164eb02d SW |
550 | return false; |
551 | ||
2eb278e0 | 552 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
553 | return false; |
554 | ||
555 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
392b9ffb | 556 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
133d40f9 SG |
557 | return false; |
558 | ||
559 | return true; | |
560 | } | |
561 | ||
562 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
563 | { | |
564 | lockdep_assert_held(&local->mtx); | |
565 | ||
566 | if (!local->scan_req || local->scanning) | |
567 | return; | |
568 | ||
e2fd5dbc JB |
569 | if (!ieee80211_can_scan(local, |
570 | rcu_dereference_protected( | |
571 | local->scan_sdata, | |
572 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
573 | return; |
574 | ||
575 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
576 | round_jiffies_relative(0)); | |
577 | } | |
f3b85252 | 578 | |
45ad6834 JB |
579 | static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, |
580 | const u8 *src, const u8 *dst, | |
581 | const u8 *ssid, size_t ssid_len, | |
582 | const u8 *ie, size_t ie_len, | |
583 | u32 ratemask, u32 flags, u32 tx_flags, | |
584 | struct ieee80211_channel *channel) | |
585 | { | |
586 | struct sk_buff *skb; | |
b9771d41 | 587 | u32 txdata_flags = 0; |
45ad6834 JB |
588 | |
589 | skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel, | |
590 | ssid, ssid_len, | |
591 | ie, ie_len, flags); | |
b9771d41 | 592 | |
45ad6834 | 593 | if (skb) { |
b9771d41 JB |
594 | if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { |
595 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
596 | u16 sn = get_random_u32(); | |
597 | ||
598 | txdata_flags |= IEEE80211_TX_NO_SEQNO; | |
599 | hdr->seq_ctrl = | |
600 | cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); | |
601 | } | |
45ad6834 | 602 | IEEE80211_SKB_CB(skb)->flags |= tx_flags; |
b9771d41 JB |
603 | ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band, |
604 | txdata_flags); | |
45ad6834 JB |
605 | } |
606 | } | |
607 | ||
8a690674 BG |
608 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
609 | unsigned long *next_delay) | |
610 | { | |
611 | int i; | |
e2fd5dbc | 612 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 613 | struct cfg80211_scan_request *scan_req; |
57fbcce3 | 614 | enum nl80211_band band = local->hw.conf.chandef.chan->band; |
b9771d41 | 615 | u32 flags = 0, tx_flags; |
6c17b77b | 616 | |
6ea0a69c JB |
617 | scan_req = rcu_dereference_protected(local->scan_req, |
618 | lockdep_is_held(&local->mtx)); | |
619 | ||
6c17b77b | 620 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
6ea0a69c | 621 | if (scan_req->no_cck) |
6c17b77b | 622 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
b9771d41 JB |
623 | if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
624 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; | |
625 | if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) | |
626 | flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; | |
8a690674 | 627 | |
e2fd5dbc | 628 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 629 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 630 | |
6ea0a69c | 631 | for (i = 0; i < scan_req->n_ssids; i++) |
45ad6834 | 632 | ieee80211_send_scan_probe_req( |
e345f44f | 633 | sdata, local->scan_addr, scan_req->bssid, |
6ea0a69c JB |
634 | scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, |
635 | scan_req->ie, scan_req->ie_len, | |
b9771d41 | 636 | scan_req->rates[band], flags, |
45ad6834 | 637 | tx_flags, local->hw.conf.chandef.chan); |
8a690674 BG |
638 | |
639 | /* | |
640 | * After sending probe requests, wait for probe responses | |
641 | * on the channel. | |
642 | */ | |
643 | *next_delay = IEEE80211_CHANNEL_TIME; | |
644 | local->next_scan_state = SCAN_DECISION; | |
645 | } | |
646 | ||
f3b85252 JB |
647 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
648 | struct cfg80211_scan_request *req) | |
649 | { | |
650 | struct ieee80211_local *local = sdata->local; | |
e9da68dd | 651 | bool hw_scan = local->ops->hw_scan; |
f3b85252 JB |
652 | int rc; |
653 | ||
e229f844 SG |
654 | lockdep_assert_held(&local->mtx); |
655 | ||
dc0c18ed AK |
656 | if (local->scan_req) |
657 | return -EBUSY; | |
658 | ||
659 | if (!__ieee80211_can_leave_ch(sdata)) | |
f3b85252 JB |
660 | return -EBUSY; |
661 | ||
133d40f9 | 662 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 663 | /* wait for the work to finish/time out */ |
6ea0a69c | 664 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 665 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
666 | return 0; |
667 | } | |
668 | ||
e9da68dd JB |
669 | again: |
670 | if (hw_scan) { | |
f3b85252 | 671 | u8 *ies; |
f3b85252 | 672 | |
e4dcbb37 | 673 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
c56ef672 | 674 | |
30686bf7 | 675 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
c56ef672 DS |
676 | int i, n_bands = 0; |
677 | u8 bands_counted = 0; | |
678 | ||
679 | for (i = 0; i < req->n_channels; i++) { | |
680 | if (bands_counted & BIT(req->channels[i]->band)) | |
681 | continue; | |
682 | bands_counted |= BIT(req->channels[i]->band); | |
683 | n_bands++; | |
684 | } | |
685 | ||
686 | local->hw_scan_ies_bufsize *= n_bands; | |
687 | } | |
688 | ||
4d36ec58 JB |
689 | local->hw_scan_req = kmalloc( |
690 | sizeof(*local->hw_scan_req) + | |
691 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 692 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 693 | if (!local->hw_scan_req) |
f3b85252 JB |
694 | return -ENOMEM; |
695 | ||
c56ef672 DS |
696 | local->hw_scan_req->req.ssids = req->ssids; |
697 | local->hw_scan_req->req.n_ssids = req->n_ssids; | |
4d36ec58 JB |
698 | ies = (u8 *)local->hw_scan_req + |
699 | sizeof(*local->hw_scan_req) + | |
700 | req->n_channels * sizeof(req->channels[0]); | |
c56ef672 DS |
701 | local->hw_scan_req->req.ie = ies; |
702 | local->hw_scan_req->req.flags = req->flags; | |
e345f44f | 703 | eth_broadcast_addr(local->hw_scan_req->req.bssid); |
7947d3e0 AS |
704 | local->hw_scan_req->req.duration = req->duration; |
705 | local->hw_scan_req->req.duration_mandatory = | |
706 | req->duration_mandatory; | |
4d36ec58 JB |
707 | |
708 | local->hw_scan_band = 0; | |
6e7e6213 JL |
709 | |
710 | /* | |
711 | * After allocating local->hw_scan_req, we must | |
712 | * go through until ieee80211_prep_hw_scan(), so | |
713 | * anything that might be changed here and leave | |
714 | * this function early must not go after this | |
715 | * allocation. | |
716 | */ | |
f3b85252 JB |
717 | } |
718 | ||
6ea0a69c | 719 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 720 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 721 | |
a344d677 JB |
722 | if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
723 | get_random_mask_addr(local->scan_addr, | |
724 | req->mac_addr, | |
725 | req->mac_addr_mask); | |
726 | else | |
727 | memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); | |
728 | ||
e9da68dd | 729 | if (hw_scan) { |
fbe9c429 | 730 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 731 | } else if ((req->n_channels == 1) && |
675a0b04 | 732 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
733 | /* |
734 | * If we are scanning only on the operating channel | |
735 | * then we do not need to stop normal activities | |
8a690674 BG |
736 | */ |
737 | unsigned long next_delay; | |
738 | ||
739 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
740 | ||
741 | ieee80211_recalc_idle(local); | |
742 | ||
743 | /* Notify driver scan is starting, keep order of operations | |
744 | * same as normal software scan, in case that matters. */ | |
a344d677 | 745 | drv_sw_scan_start(local, sdata, local->scan_addr); |
8a690674 BG |
746 | |
747 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
748 | ||
749 | /* We need to ensure power level is at max for scanning. */ | |
750 | ieee80211_hw_config(local, 0); | |
751 | ||
4e39ccac AQ |
752 | if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | |
753 | IEEE80211_CHAN_RADAR)) || | |
6ea0a69c | 754 | !req->n_ssids) { |
8a690674 BG |
755 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
756 | } else { | |
757 | ieee80211_scan_state_send_probe(local, &next_delay); | |
758 | next_delay = IEEE80211_CHANNEL_TIME; | |
759 | } | |
760 | ||
761 | /* Now, just wait a bit and we are all done! */ | |
762 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
763 | next_delay); | |
764 | return 0; | |
765 | } else { | |
766 | /* Do normal software scan */ | |
fbe9c429 | 767 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 768 | } |
6e7e6213 | 769 | |
5cff20e6 | 770 | ieee80211_recalc_idle(local); |
f3b85252 | 771 | |
e9da68dd | 772 | if (hw_scan) { |
4d36ec58 | 773 | WARN_ON(!ieee80211_prep_hw_scan(local)); |
a060bbfe | 774 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
a344d677 JB |
775 | } else { |
776 | rc = ieee80211_start_sw_scan(local, sdata); | |
777 | } | |
f3b85252 | 778 | |
f3b85252 | 779 | if (rc) { |
4d36ec58 JB |
780 | kfree(local->hw_scan_req); |
781 | local->hw_scan_req = NULL; | |
fbe9c429 | 782 | local->scanning = 0; |
f3b85252 | 783 | |
5cff20e6 JB |
784 | ieee80211_recalc_idle(local); |
785 | ||
f3b85252 | 786 | local->scan_req = NULL; |
0c2bef46 | 787 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 JB |
788 | } |
789 | ||
e9da68dd JB |
790 | if (hw_scan && rc == 1) { |
791 | /* | |
792 | * we can't fall back to software for P2P-GO | |
793 | * as it must update NoA etc. | |
794 | */ | |
795 | if (ieee80211_vif_type_p2p(&sdata->vif) == | |
796 | NL80211_IFTYPE_P2P_GO) | |
797 | return -EOPNOTSUPP; | |
798 | hw_scan = false; | |
799 | goto again; | |
800 | } | |
801 | ||
f3b85252 JB |
802 | return rc; |
803 | } | |
804 | ||
df13cce5 HS |
805 | static unsigned long |
806 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
807 | { | |
808 | /* | |
809 | * TODO: channel switching also consumes quite some time, | |
810 | * add that delay as well to get a better estimation | |
811 | */ | |
4e39ccac | 812 | if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) |
df13cce5 HS |
813 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
814 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
815 | } | |
816 | ||
e229f844 SG |
817 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
818 | unsigned long *next_delay) | |
7d3be3cc | 819 | { |
142b9f50 | 820 | bool associated = false; |
df13cce5 HS |
821 | bool tx_empty = true; |
822 | bool bad_latency; | |
142b9f50 | 823 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 824 | struct ieee80211_channel *next_chan; |
cd2bb512 | 825 | enum mac80211_scan_state next_scan_state; |
6ea0a69c | 826 | struct cfg80211_scan_request *scan_req; |
142b9f50 | 827 | |
df13cce5 HS |
828 | /* |
829 | * check if at least one STA interface is associated, | |
830 | * check if at least one STA interface has pending tx frames | |
831 | * and grab the lowest used beacon interval | |
832 | */ | |
142b9f50 HS |
833 | mutex_lock(&local->iflist_mtx); |
834 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 835 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
836 | continue; |
837 | ||
838 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
839 | if (sdata->u.mgd.associated) { | |
840 | associated = true; | |
df13cce5 | 841 | |
df13cce5 HS |
842 | if (!qdisc_all_tx_empty(sdata->dev)) { |
843 | tx_empty = false; | |
844 | break; | |
845 | } | |
142b9f50 HS |
846 | } |
847 | } | |
848 | } | |
849 | mutex_unlock(&local->iflist_mtx); | |
850 | ||
6ea0a69c JB |
851 | scan_req = rcu_dereference_protected(local->scan_req, |
852 | lockdep_is_held(&local->mtx)); | |
853 | ||
854 | next_chan = scan_req->channels[local->scan_channel_idx]; | |
b23b025f | 855 | |
a80f7c0b | 856 | /* |
07ef03ee JB |
857 | * we're currently scanning a different channel, let's |
858 | * see if we can scan another channel without interfering | |
859 | * with the current traffic situation. | |
860 | * | |
3f892b61 | 861 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 862 | */ |
a80f7c0b | 863 | |
07ef03ee | 864 | bad_latency = time_after(jiffies + |
3f892b61 SG |
865 | ieee80211_scan_get_channel_time(next_chan), |
866 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 867 | |
cd2bb512 | 868 | if (associated && !tx_empty) { |
6ea0a69c | 869 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
cd2bb512 SL |
870 | next_scan_state = SCAN_ABORT; |
871 | else | |
872 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 873 | } else if (associated && bad_latency) { |
cd2bb512 SL |
874 | next_scan_state = SCAN_SUSPEND; |
875 | } else { | |
876 | next_scan_state = SCAN_SET_CHANNEL; | |
877 | } | |
878 | ||
879 | local->next_scan_state = next_scan_state; | |
142b9f50 | 880 | |
07ef03ee | 881 | *next_delay = 0; |
142b9f50 HS |
882 | } |
883 | ||
2fb3f028 HS |
884 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
885 | unsigned long *next_delay) | |
886 | { | |
887 | int skip; | |
888 | struct ieee80211_channel *chan; | |
7ca15a0a | 889 | enum nl80211_bss_scan_width oper_scan_width; |
6ea0a69c JB |
890 | struct cfg80211_scan_request *scan_req; |
891 | ||
892 | scan_req = rcu_dereference_protected(local->scan_req, | |
893 | lockdep_is_held(&local->mtx)); | |
2fb3f028 | 894 | |
7d3be3cc | 895 | skip = 0; |
6ea0a69c | 896 | chan = scan_req->channels[local->scan_channel_idx]; |
7d3be3cc | 897 | |
7ca15a0a SW |
898 | local->scan_chandef.chan = chan; |
899 | local->scan_chandef.center_freq1 = chan->center_freq; | |
b6011960 | 900 | local->scan_chandef.freq1_offset = chan->freq_offset; |
7ca15a0a | 901 | local->scan_chandef.center_freq2 = 0; |
6ea0a69c | 902 | switch (scan_req->scan_width) { |
7ca15a0a SW |
903 | case NL80211_BSS_CHAN_WIDTH_5: |
904 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; | |
905 | break; | |
906 | case NL80211_BSS_CHAN_WIDTH_10: | |
907 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; | |
908 | break; | |
909 | case NL80211_BSS_CHAN_WIDTH_20: | |
910 | /* If scanning on oper channel, use whatever channel-type | |
911 | * is currently in use. | |
912 | */ | |
913 | oper_scan_width = cfg80211_chandef_to_scan_width( | |
914 | &local->_oper_chandef); | |
915 | if (chan == local->_oper_chandef.chan && | |
6ea0a69c | 916 | oper_scan_width == scan_req->scan_width) |
7ca15a0a SW |
917 | local->scan_chandef = local->_oper_chandef; |
918 | else | |
919 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; | |
920 | break; | |
921 | } | |
b23b025f | 922 | |
07ef03ee JB |
923 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
924 | skip = 1; | |
7d3be3cc | 925 | |
7d3be3cc HS |
926 | /* advance state machine to next channel/band */ |
927 | local->scan_channel_idx++; | |
928 | ||
0ee9c13c HS |
929 | if (skip) { |
930 | /* if we skip this channel return to the decision state */ | |
931 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 932 | return; |
0ee9c13c | 933 | } |
7d3be3cc HS |
934 | |
935 | /* | |
936 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
937 | * (which unfortunately doesn't say _why_ step a) is done, | |
938 | * but it waits for the probe delay or until a frame is | |
939 | * received - and the received frame would update the NAV). | |
940 | * For now, we do not support waiting until a frame is | |
941 | * received. | |
942 | * | |
943 | * In any case, it is not necessary for a passive scan. | |
944 | */ | |
4e39ccac AQ |
945 | if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || |
946 | !scan_req->n_ssids) { | |
7d3be3cc | 947 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
977923b0 | 948 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 949 | return; |
7d3be3cc HS |
950 | } |
951 | ||
2fb3f028 | 952 | /* active scan, send probes */ |
7d3be3cc | 953 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 954 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
955 | } |
956 | ||
07ef03ee JB |
957 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
958 | unsigned long *next_delay) | |
959 | { | |
960 | /* switch back to the operating channel */ | |
7ca15a0a | 961 | local->scan_chandef.chan = NULL; |
07ef03ee JB |
962 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
963 | ||
aacde9ee SG |
964 | /* disable PS */ |
965 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
966 | |
967 | *next_delay = HZ / 5; | |
968 | /* afterwards, resume scan & go to next channel */ | |
969 | local->next_scan_state = SCAN_RESUME; | |
970 | } | |
971 | ||
972 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
973 | unsigned long *next_delay) | |
974 | { | |
aacde9ee | 975 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
976 | |
977 | if (local->ops->flush) { | |
3b24f4c6 | 978 | ieee80211_flush_queues(local, NULL, false); |
07ef03ee JB |
979 | *next_delay = 0; |
980 | } else | |
981 | *next_delay = HZ / 10; | |
982 | ||
983 | /* remember when we left the operating channel */ | |
984 | local->leave_oper_channel_time = jiffies; | |
985 | ||
986 | /* advance to the next channel to be scanned */ | |
de2ee84d | 987 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
988 | } |
989 | ||
c2b13452 | 990 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
991 | { |
992 | struct ieee80211_local *local = | |
993 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 994 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 995 | struct cfg80211_scan_request *scan_req; |
0a51b27e | 996 | unsigned long next_delay = 0; |
8bd2a248 | 997 | bool aborted; |
0a51b27e | 998 | |
259b62e3 | 999 | mutex_lock(&local->mtx); |
8789d459 | 1000 | |
332ff7fe LC |
1001 | if (!ieee80211_can_run_worker(local)) { |
1002 | aborted = true; | |
1003 | goto out_complete; | |
1004 | } | |
1005 | ||
e2fd5dbc JB |
1006 | sdata = rcu_dereference_protected(local->scan_sdata, |
1007 | lockdep_is_held(&local->mtx)); | |
6ea0a69c JB |
1008 | scan_req = rcu_dereference_protected(local->scan_req, |
1009 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 1010 | |
8a690674 BG |
1011 | /* When scanning on-channel, the first-callback means completed. */ |
1012 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
1013 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
1014 | goto out_complete; | |
1015 | } | |
1016 | ||
259b62e3 | 1017 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 1018 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 1019 | goto out_complete; |
8789d459 JB |
1020 | } |
1021 | ||
6ea0a69c | 1022 | if (!sdata || !scan_req) |
259b62e3 | 1023 | goto out; |
f3b85252 | 1024 | |
ff5db439 | 1025 | if (!local->scanning) { |
f3b85252 JB |
1026 | int rc; |
1027 | ||
6ea0a69c | 1028 | RCU_INIT_POINTER(local->scan_req, NULL); |
0c2bef46 | 1029 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 | 1030 | |
6ea0a69c | 1031 | rc = __ieee80211_start_scan(sdata, scan_req); |
259b62e3 | 1032 | if (rc) { |
3aed49ef | 1033 | /* need to complete scan in cfg80211 */ |
6ea0a69c | 1034 | rcu_assign_pointer(local->scan_req, scan_req); |
259b62e3 SG |
1035 | aborted = true; |
1036 | goto out_complete; | |
1037 | } else | |
1038 | goto out; | |
f3b85252 JB |
1039 | } |
1040 | ||
f502d09b HS |
1041 | /* |
1042 | * as long as no delay is required advance immediately | |
1043 | * without scheduling a new work | |
1044 | */ | |
1045 | do { | |
c29acf20 RM |
1046 | if (!ieee80211_sdata_running(sdata)) { |
1047 | aborted = true; | |
1048 | goto out_complete; | |
1049 | } | |
1050 | ||
977923b0 | 1051 | switch (local->next_scan_state) { |
2fb3f028 | 1052 | case SCAN_DECISION: |
e229f844 | 1053 | /* if no more bands/channels left, complete scan */ |
6ea0a69c | 1054 | if (local->scan_channel_idx >= scan_req->n_channels) { |
e229f844 SG |
1055 | aborted = false; |
1056 | goto out_complete; | |
1057 | } | |
1058 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 1059 | break; |
2fb3f028 HS |
1060 | case SCAN_SET_CHANNEL: |
1061 | ieee80211_scan_state_set_channel(local, &next_delay); | |
1062 | break; | |
f502d09b HS |
1063 | case SCAN_SEND_PROBE: |
1064 | ieee80211_scan_state_send_probe(local, &next_delay); | |
1065 | break; | |
07ef03ee JB |
1066 | case SCAN_SUSPEND: |
1067 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 1068 | break; |
07ef03ee JB |
1069 | case SCAN_RESUME: |
1070 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 1071 | break; |
cd2bb512 SL |
1072 | case SCAN_ABORT: |
1073 | aborted = true; | |
1074 | goto out_complete; | |
f502d09b HS |
1075 | } |
1076 | } while (next_delay == 0); | |
0a51b27e | 1077 | |
42935eca | 1078 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 1079 | goto out; |
259b62e3 SG |
1080 | |
1081 | out_complete: | |
8bd2a248 | 1082 | __ieee80211_scan_completed(&local->hw, aborted); |
259b62e3 SG |
1083 | out: |
1084 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
1085 | } |
1086 | ||
f3b85252 JB |
1087 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
1088 | struct cfg80211_scan_request *req) | |
0a51b27e | 1089 | { |
f3b85252 | 1090 | int res; |
de95a54b | 1091 | |
a1699b75 | 1092 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 1093 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 1094 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 1095 | |
f3b85252 | 1096 | return res; |
0a51b27e JB |
1097 | } |
1098 | ||
34bcf715 SG |
1099 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
1100 | const u8 *ssid, u8 ssid_len, | |
76bed0f4 JD |
1101 | struct ieee80211_channel **channels, |
1102 | unsigned int n_channels, | |
7ca15a0a | 1103 | enum nl80211_bss_scan_width scan_width) |
0a51b27e | 1104 | { |
0a51b27e | 1105 | struct ieee80211_local *local = sdata->local; |
76bed0f4 | 1106 | int ret = -EBUSY, i, n_ch = 0; |
57fbcce3 | 1107 | enum nl80211_band band; |
2a519311 | 1108 | |
a1699b75 | 1109 | mutex_lock(&local->mtx); |
0a51b27e | 1110 | |
f3b85252 JB |
1111 | /* busy scanning */ |
1112 | if (local->scan_req) | |
1113 | goto unlock; | |
9116dd01 | 1114 | |
be4a4b6a | 1115 | /* fill internal scan request */ |
76bed0f4 JD |
1116 | if (!channels) { |
1117 | int max_n; | |
be4a4b6a | 1118 | |
57fbcce3 | 1119 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
be4a4b6a JB |
1120 | if (!local->hw.wiphy->bands[band]) |
1121 | continue; | |
34bcf715 SG |
1122 | |
1123 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
1124 | for (i = 0; i < max_n; i++) { | |
1125 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 1126 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 | 1127 | |
8fe02e16 | 1128 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
1129 | IEEE80211_CHAN_DISABLED)) |
1130 | continue; | |
1131 | ||
1132 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
1133 | n_ch++; | |
be4a4b6a JB |
1134 | } |
1135 | } | |
1136 | ||
34bcf715 SG |
1137 | if (WARN_ON_ONCE(n_ch == 0)) |
1138 | goto unlock; | |
1139 | ||
1140 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 1141 | } else { |
76bed0f4 JD |
1142 | for (i = 0; i < n_channels; i++) { |
1143 | if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | | |
1144 | IEEE80211_CHAN_DISABLED)) | |
1145 | continue; | |
1146 | ||
1147 | local->int_scan_req->channels[n_ch] = channels[i]; | |
1148 | n_ch++; | |
1149 | } | |
1150 | ||
1151 | if (WARN_ON_ONCE(n_ch == 0)) | |
34bcf715 SG |
1152 | goto unlock; |
1153 | ||
76bed0f4 | 1154 | local->int_scan_req->n_channels = n_ch; |
be4a4b6a JB |
1155 | } |
1156 | ||
1157 | local->int_scan_req->ssids = &local->scan_ssid; | |
1158 | local->int_scan_req->n_ssids = 1; | |
7ca15a0a | 1159 | local->int_scan_req->scan_width = scan_width; |
5ba63533 JB |
1160 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
1161 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 1162 | |
5ba63533 | 1163 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 1164 | unlock: |
a1699b75 | 1165 | mutex_unlock(&local->mtx); |
f3b85252 | 1166 | return ret; |
0a51b27e | 1167 | } |
5bb644a0 | 1168 | |
4136c422 SG |
1169 | /* |
1170 | * Only call this function when a scan can't be queued -- under RTNL. | |
1171 | */ | |
5bb644a0 JB |
1172 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
1173 | { | |
5bb644a0 | 1174 | /* |
b856439b | 1175 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
1176 | * yet really started (see __ieee80211_start_scan ). |
1177 | * | |
1178 | * Regarding hardware scan: | |
1179 | * - we can not call __ieee80211_scan_completed() as when | |
1180 | * SCAN_HW_SCANNING bit is set this function change | |
1181 | * local->hw_scan_req to operate on 5G band, what race with | |
1182 | * driver which can use local->hw_scan_req | |
1183 | * | |
1184 | * - we can not cancel scan_work since driver can schedule it | |
1185 | * by ieee80211_scan_completed(..., true) to finish scan | |
1186 | * | |
b856439b EP |
1187 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
1188 | * driver is still responsible for calling ieee80211_scan_completed() | |
1189 | * after the scan was completed/aborted. | |
5bb644a0 | 1190 | */ |
4136c422 | 1191 | |
a1699b75 | 1192 | mutex_lock(&local->mtx); |
b856439b EP |
1193 | if (!local->scan_req) |
1194 | goto out; | |
1195 | ||
a754055a EG |
1196 | /* |
1197 | * We have a scan running and the driver already reported completion, | |
1198 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
1199 | * cancelled. | |
1200 | */ | |
1201 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
1202 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
1203 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
1204 | goto out; | |
1205 | } | |
1206 | ||
b856439b | 1207 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
a754055a EG |
1208 | /* |
1209 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
1210 | * scan on another band. | |
1211 | */ | |
1212 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 1213 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
1214 | drv_cancel_hw_scan(local, |
1215 | rcu_dereference_protected(local->scan_sdata, | |
1216 | lockdep_is_held(&local->mtx))); | |
b856439b | 1217 | goto out; |
4136c422 | 1218 | } |
b856439b EP |
1219 | |
1220 | /* | |
1221 | * If the work is currently running, it must be blocked on | |
1222 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
1223 | * simply exit once it acquires the mutex. | |
1224 | */ | |
1225 | cancel_delayed_work(&local->scan_work); | |
1226 | /* and clean up */ | |
7947d3e0 | 1227 | memset(&local->scan_info, 0, sizeof(local->scan_info)); |
8bd2a248 | 1228 | __ieee80211_scan_completed(&local->hw, true); |
b856439b | 1229 | out: |
d07bfd8b | 1230 | mutex_unlock(&local->mtx); |
5bb644a0 | 1231 | } |
79f460ca | 1232 | |
d43c6b6e DS |
1233 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1234 | struct cfg80211_sched_scan_request *req) | |
79f460ca LC |
1235 | { |
1236 | struct ieee80211_local *local = sdata->local; | |
633e2713 | 1237 | struct ieee80211_scan_ies sched_scan_ies = {}; |
2103dec1 | 1238 | struct cfg80211_chan_def chandef; |
633e2713 | 1239 | int ret, i, iebufsz, num_bands = 0; |
57fbcce3 | 1240 | u32 rate_masks[NUM_NL80211_BANDS] = {}; |
633e2713 DS |
1241 | u8 bands_used = 0; |
1242 | u8 *ie; | |
b9771d41 | 1243 | u32 flags = 0; |
c604b9f2 | 1244 | |
e4dcbb37 | 1245 | iebufsz = local->scan_ies_len + req->ie_len; |
79f460ca | 1246 | |
d43c6b6e | 1247 | lockdep_assert_held(&local->mtx); |
79f460ca | 1248 | |
d43c6b6e DS |
1249 | if (!local->ops->sched_scan_start) |
1250 | return -ENOTSUPP; | |
79f460ca | 1251 | |
57fbcce3 | 1252 | for (i = 0; i < NUM_NL80211_BANDS; i++) { |
633e2713 DS |
1253 | if (local->hw.wiphy->bands[i]) { |
1254 | bands_used |= BIT(i); | |
1255 | rate_masks[i] = (u32) -1; | |
1256 | num_bands++; | |
79f460ca | 1257 | } |
633e2713 | 1258 | } |
79f460ca | 1259 | |
b9771d41 JB |
1260 | if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
1261 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; | |
1262 | ||
6396bb22 | 1263 | ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); |
633e2713 DS |
1264 | if (!ie) { |
1265 | ret = -ENOMEM; | |
1266 | goto out; | |
79f460ca LC |
1267 | } |
1268 | ||
633e2713 DS |
1269 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
1270 | ||
cd5861bd KR |
1271 | ieee80211_build_preq_ies(local, ie, num_bands * iebufsz, |
1272 | &sched_scan_ies, req->ie, | |
00387f32 | 1273 | req->ie_len, bands_used, rate_masks, &chandef, |
b9771d41 | 1274 | flags); |
633e2713 | 1275 | |
30dd3edf | 1276 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
d43c6b6e | 1277 | if (ret == 0) { |
5260a5b2 | 1278 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
6ea0a69c | 1279 | rcu_assign_pointer(local->sched_scan_req, req); |
d43c6b6e | 1280 | } |
79f460ca | 1281 | |
633e2713 | 1282 | kfree(ie); |
d43c6b6e | 1283 | |
633e2713 | 1284 | out: |
d43c6b6e DS |
1285 | if (ret) { |
1286 | /* Clean in case of failure after HW restart or upon resume. */ | |
0c2bef46 | 1287 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
6ea0a69c | 1288 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e DS |
1289 | } |
1290 | ||
1291 | return ret; | |
1292 | } | |
1293 | ||
1294 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
1295 | struct cfg80211_sched_scan_request *req) | |
1296 | { | |
1297 | struct ieee80211_local *local = sdata->local; | |
1298 | int ret; | |
1299 | ||
1300 | mutex_lock(&local->mtx); | |
1301 | ||
1302 | if (rcu_access_pointer(local->sched_scan_sdata)) { | |
1303 | mutex_unlock(&local->mtx); | |
1304 | return -EBUSY; | |
1305 | } | |
1306 | ||
1307 | ret = __ieee80211_request_sched_scan_start(sdata, req); | |
1308 | ||
5260a5b2 | 1309 | mutex_unlock(&local->mtx); |
79f460ca LC |
1310 | return ret; |
1311 | } | |
1312 | ||
0d440ea2 | 1313 | int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) |
79f460ca | 1314 | { |
0d440ea2 EP |
1315 | struct ieee80211_sub_if_data *sched_scan_sdata; |
1316 | int ret = -ENOENT; | |
79f460ca | 1317 | |
5260a5b2 | 1318 | mutex_lock(&local->mtx); |
79f460ca LC |
1319 | |
1320 | if (!local->ops->sched_scan_stop) { | |
1321 | ret = -ENOTSUPP; | |
1322 | goto out; | |
1323 | } | |
1324 | ||
d43c6b6e | 1325 | /* We don't want to restart sched scan anymore. */ |
6ea0a69c | 1326 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1327 | |
0d440ea2 EP |
1328 | sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, |
1329 | lockdep_is_held(&local->mtx)); | |
1330 | if (sched_scan_sdata) { | |
1331 | ret = drv_sched_scan_stop(local, sched_scan_sdata); | |
71228a1e | 1332 | if (!ret) |
ad053a96 | 1333 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
71228a1e | 1334 | } |
79f460ca | 1335 | out: |
5260a5b2 | 1336 | mutex_unlock(&local->mtx); |
79f460ca LC |
1337 | |
1338 | return ret; | |
1339 | } | |
1340 | ||
1341 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1342 | { | |
1343 | struct ieee80211_local *local = hw_to_local(hw); | |
1344 | ||
1345 | trace_api_sched_scan_results(local); | |
1346 | ||
b34939b9 | 1347 | cfg80211_sched_scan_results(hw->wiphy, 0); |
79f460ca LC |
1348 | } |
1349 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1350 | ||
f6837ba8 | 1351 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
85a9994a | 1352 | { |
85a9994a LC |
1353 | mutex_lock(&local->mtx); |
1354 | ||
5260a5b2 | 1355 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1356 | mutex_unlock(&local->mtx); |
1357 | return; | |
1358 | } | |
1359 | ||
0c2bef46 | 1360 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
85a9994a | 1361 | |
d43c6b6e | 1362 | /* If sched scan was aborted by the driver. */ |
6ea0a69c | 1363 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1364 | |
85a9994a LC |
1365 | mutex_unlock(&local->mtx); |
1366 | ||
b34939b9 | 1367 | cfg80211_sched_scan_stopped(local->hw.wiphy, 0); |
85a9994a LC |
1368 | } |
1369 | ||
f6837ba8 JB |
1370 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1371 | { | |
1372 | struct ieee80211_local *local = | |
1373 | container_of(work, struct ieee80211_local, | |
1374 | sched_scan_stopped_work); | |
1375 | ||
1376 | ieee80211_sched_scan_end(local); | |
1377 | } | |
1378 | ||
79f460ca LC |
1379 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1380 | { | |
1381 | struct ieee80211_local *local = hw_to_local(hw); | |
1382 | ||
1383 | trace_api_sched_scan_stopped(local); | |
1384 | ||
2bc533bd EP |
1385 | /* |
1386 | * this shouldn't really happen, so for simplicity | |
1387 | * simply ignore it, and let mac80211 reconfigure | |
1388 | * the sched scan later on. | |
1389 | */ | |
1390 | if (local->in_reconfig) | |
1391 | return; | |
1392 | ||
18db594a | 1393 | schedule_work(&local->sched_scan_stopped_work); |
79f460ca LC |
1394 | } |
1395 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |