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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 |
108d2022 | 12 | * Copyright (C) 2018-2023 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 | ||
108d2022 BB |
58 | struct inform_bss_update_data { |
59 | struct ieee80211_rx_status *rx_status; | |
60 | bool beacon; | |
61 | }; | |
62 | ||
63 | void ieee80211_inform_bss(struct wiphy *wiphy, | |
64 | struct cfg80211_bss *cbss, | |
65 | const struct cfg80211_bss_ies *ies, | |
66 | void *data) | |
fcea7db5 | 67 | { |
108d2022 BB |
68 | struct ieee80211_local *local = wiphy_priv(wiphy); |
69 | struct inform_bss_update_data *update_data = data; | |
70 | struct ieee80211_bss *bss = (void *)cbss->priv; | |
71 | struct ieee80211_rx_status *rx_status; | |
72 | struct ieee802_11_elems *elems; | |
fcea7db5 SS |
73 | int clen, srlen; |
74 | ||
108d2022 BB |
75 | /* This happens while joining an IBSS */ |
76 | if (!update_data) | |
77 | return; | |
78 | ||
79 | elems = ieee802_11_parse_elems(ies->data, ies->len, false, NULL); | |
80 | if (!elems) | |
81 | return; | |
82 | ||
83 | rx_status = update_data->rx_status; | |
84 | ||
85 | if (update_data->beacon) | |
fcea7db5 SS |
86 | bss->device_ts_beacon = rx_status->device_timestamp; |
87 | else | |
88 | bss->device_ts_presp = rx_status->device_timestamp; | |
89 | ||
90 | if (elems->parse_error) { | |
108d2022 | 91 | if (update_data->beacon) |
fcea7db5 SS |
92 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; |
93 | else | |
94 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
95 | } else { | |
108d2022 | 96 | if (update_data->beacon) |
fcea7db5 SS |
97 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; |
98 | else | |
99 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
100 | } | |
101 | ||
102 | /* save the ERP value so that it is available at association time */ | |
103 | if (elems->erp_info && (!elems->parse_error || | |
104 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
105 | bss->erp_value = elems->erp_info[0]; | |
106 | bss->has_erp_value = true; | |
107 | if (!elems->parse_error) | |
108 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
109 | } | |
110 | ||
111 | /* replace old supported rates if we get new values */ | |
112 | if (!elems->parse_error || | |
113 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
114 | srlen = 0; | |
115 | if (elems->supp_rates) { | |
116 | clen = IEEE80211_MAX_SUPP_RATES; | |
117 | if (clen > elems->supp_rates_len) | |
118 | clen = elems->supp_rates_len; | |
119 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
120 | srlen += clen; | |
121 | } | |
122 | if (elems->ext_supp_rates) { | |
123 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
124 | if (clen > elems->ext_supp_rates_len) | |
125 | clen = elems->ext_supp_rates_len; | |
126 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
127 | clen); | |
128 | srlen += clen; | |
129 | } | |
130 | if (srlen) { | |
131 | bss->supp_rates_len = srlen; | |
132 | if (!elems->parse_error) | |
133 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
134 | } | |
135 | } | |
136 | ||
137 | if (!elems->parse_error || | |
138 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
139 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
140 | bss->uapsd_supported = is_uapsd_supported(elems); | |
141 | if (!elems->parse_error) | |
142 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
143 | } | |
144 | ||
108d2022 | 145 | if (update_data->beacon) { |
fcea7db5 SS |
146 | struct ieee80211_supported_band *sband = |
147 | local->hw.wiphy->bands[rx_status->band]; | |
148 | if (!(rx_status->encoding == RX_ENC_HT) && | |
149 | !(rx_status->encoding == RX_ENC_VHT)) | |
150 | bss->beacon_rate = | |
151 | &sband->bitrates[rx_status->rate_idx]; | |
152 | } | |
2a333a0d JB |
153 | |
154 | if (elems->vht_cap_elem) | |
155 | bss->vht_cap_info = | |
156 | le32_to_cpu(elems->vht_cap_elem->vht_cap_info); | |
157 | else | |
158 | bss->vht_cap_info = 0; | |
108d2022 BB |
159 | |
160 | kfree(elems); | |
fcea7db5 SS |
161 | } |
162 | ||
c2b13452 | 163 | struct ieee80211_bss * |
5484e237 JB |
164 | ieee80211_bss_info_update(struct ieee80211_local *local, |
165 | struct ieee80211_rx_status *rx_status, | |
d45c4172 | 166 | struct ieee80211_mgmt *mgmt, size_t len, |
d45c4172 | 167 | struct ieee80211_channel *channel) |
5484e237 | 168 | { |
cd418ba6 TP |
169 | bool beacon = ieee80211_is_beacon(mgmt->frame_control) || |
170 | ieee80211_is_s1g_beacon(mgmt->frame_control); | |
108d2022 BB |
171 | struct cfg80211_bss *cbss; |
172 | struct inform_bss_update_data update_data = { | |
173 | .rx_status = rx_status, | |
174 | .beacon = beacon, | |
175 | }; | |
162dd6a7 JB |
176 | struct cfg80211_inform_bss bss_meta = { |
177 | .boottime_ns = rx_status->boottime_ns, | |
108d2022 | 178 | .drv_data = (void *)&update_data, |
162dd6a7 | 179 | }; |
74d803b6 | 180 | bool signal_valid; |
7947d3e0 | 181 | struct ieee80211_sub_if_data *scan_sdata; |
2a519311 | 182 | |
1ad22fb5 T |
183 | if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL) |
184 | bss_meta.signal = 0; /* invalid signal indication */ | |
185 | else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) | |
61f6bba0 | 186 | bss_meta.signal = rx_status->signal * 100; |
30686bf7 | 187 | else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) |
61f6bba0 | 188 | bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 189 | |
61f6bba0 | 190 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20; |
da6a4352 | 191 | if (rx_status->bw == RATE_INFO_BW_5) |
61f6bba0 | 192 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5; |
da6a4352 | 193 | else if (rx_status->bw == RATE_INFO_BW_10) |
61f6bba0 | 194 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10; |
7ca15a0a | 195 | |
61f6bba0 | 196 | bss_meta.chan = channel; |
7947d3e0 AS |
197 | |
198 | rcu_read_lock(); | |
199 | scan_sdata = rcu_dereference(local->scan_sdata); | |
200 | if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION && | |
f276e20b | 201 | scan_sdata->vif.cfg.assoc && |
7947d3e0 AS |
202 | ieee80211_have_rx_timestamp(rx_status)) { |
203 | bss_meta.parent_tsf = | |
204 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
205 | len + FCS_LEN, 24); | |
206 | ether_addr_copy(bss_meta.parent_bssid, | |
207 | scan_sdata->vif.bss_conf.bssid); | |
208 | } | |
209 | rcu_read_unlock(); | |
210 | ||
61f6bba0 JB |
211 | cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, |
212 | mgmt, len, GFP_ATOMIC); | |
0c1ad2ca | 213 | if (!cbss) |
00d3f14c | 214 | return NULL; |
4abb52a4 | 215 | |
74d803b6 | 216 | /* In case the signal is invalid update the status */ |
7bb106eb | 217 | signal_valid = channel == cbss->channel; |
74d803b6 SS |
218 | if (!signal_valid) |
219 | rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; | |
00d3f14c | 220 | |
108d2022 | 221 | return (void *)cbss->priv; |
5484e237 | 222 | } |
0a51b27e | 223 | |
40b0bd24 RZ |
224 | static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata, |
225 | u32 scan_flags, const u8 *da) | |
226 | { | |
227 | if (!sdata) | |
228 | return false; | |
229 | /* accept broadcast for OCE */ | |
230 | if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP && | |
231 | is_broadcast_ether_addr(da)) | |
232 | return true; | |
233 | if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR) | |
234 | return true; | |
235 | return ether_addr_equal(da, sdata->vif.addr); | |
236 | } | |
237 | ||
d48b2968 | 238 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 239 | { |
f1d58c25 | 240 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
241 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
242 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 243 | struct ieee80211_bss *bss; |
98c8fccf | 244 | struct ieee80211_channel *channel; |
e298aa35 DC |
245 | size_t min_hdr_len = offsetof(struct ieee80211_mgmt, |
246 | u.probe_resp.variable); | |
247 | ||
248 | if (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
249 | !ieee80211_is_beacon(mgmt->frame_control) && | |
250 | !ieee80211_is_s1g_beacon(mgmt->frame_control)) | |
251 | return; | |
98c8fccf | 252 | |
cd418ba6 | 253 | if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { |
e298aa35 DC |
254 | if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) |
255 | min_hdr_len = offsetof(struct ieee80211_ext, | |
256 | u.s1g_short_beacon.variable); | |
257 | else | |
258 | min_hdr_len = offsetof(struct ieee80211_ext, | |
259 | u.s1g_beacon); | |
260 | } | |
261 | ||
262 | if (skb->len < min_hdr_len) | |
d48b2968 | 263 | return; |
98c8fccf | 264 | |
d48b2968 JB |
265 | sdata1 = rcu_dereference(local->scan_sdata); |
266 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 267 | |
d48b2968 JB |
268 | if (likely(!sdata1 && !sdata2)) |
269 | return; | |
98c8fccf | 270 | |
b041b7b9 FF |
271 | if (test_and_clear_bit(SCAN_BEACON_WAIT, &local->scanning)) { |
272 | /* | |
273 | * we were passive scanning because of radar/no-IR, but | |
274 | * the beacon/proberesp rx gives us an opportunity to upgrade | |
275 | * to active scan | |
276 | */ | |
277 | set_bit(SCAN_BEACON_DONE, &local->scanning); | |
278 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
279 | } | |
280 | ||
d48b2968 | 281 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
a344d677 JB |
282 | struct cfg80211_scan_request *scan_req; |
283 | struct cfg80211_sched_scan_request *sched_scan_req; | |
40b0bd24 | 284 | u32 scan_req_flags = 0, sched_scan_req_flags = 0; |
a344d677 JB |
285 | |
286 | scan_req = rcu_dereference(local->scan_req); | |
287 | sched_scan_req = rcu_dereference(local->sched_scan_req); | |
288 | ||
40b0bd24 RZ |
289 | if (scan_req) |
290 | scan_req_flags = scan_req->flags; | |
291 | ||
292 | if (sched_scan_req) | |
293 | sched_scan_req_flags = sched_scan_req->flags; | |
294 | ||
295 | /* ignore ProbeResp to foreign address or non-bcast (OCE) | |
296 | * unless scanning with randomised address | |
a344d677 | 297 | */ |
40b0bd24 RZ |
298 | if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags, |
299 | mgmt->da) && | |
300 | !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags, | |
301 | mgmt->da)) | |
d48b2968 | 302 | return; |
98c8fccf JB |
303 | } |
304 | ||
3b23c184 TP |
305 | channel = ieee80211_get_channel_khz(local->hw.wiphy, |
306 | ieee80211_rx_status_to_khz(rx_status)); | |
98c8fccf JB |
307 | |
308 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 309 | return; |
98c8fccf | 310 | |
d48b2968 | 311 | bss = ieee80211_bss_info_update(local, rx_status, |
4abb52a4 | 312 | mgmt, skb->len, |
d45c4172 | 313 | channel); |
d048e503 | 314 | if (bss) |
d48b2968 | 315 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
316 | } |
317 | ||
2103dec1 SW |
318 | static void |
319 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, | |
320 | enum nl80211_bss_scan_width scan_width) | |
321 | { | |
322 | memset(chandef, 0, sizeof(*chandef)); | |
323 | switch (scan_width) { | |
324 | case NL80211_BSS_CHAN_WIDTH_5: | |
325 | chandef->width = NL80211_CHAN_WIDTH_5; | |
326 | break; | |
327 | case NL80211_BSS_CHAN_WIDTH_10: | |
328 | chandef->width = NL80211_CHAN_WIDTH_10; | |
329 | break; | |
330 | default: | |
331 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
332 | break; | |
333 | } | |
334 | } | |
335 | ||
4d36ec58 | 336 | /* return false if no more work */ |
2ad2274c | 337 | static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata) |
4d36ec58 | 338 | { |
2ad2274c | 339 | struct ieee80211_local *local = sdata->local; |
6ea0a69c | 340 | struct cfg80211_scan_request *req; |
2103dec1 | 341 | struct cfg80211_chan_def chandef; |
c56ef672 | 342 | u8 bands_used = 0; |
4d36ec58 | 343 | int i, ielen, n_chans; |
b9771d41 | 344 | u32 flags = 0; |
4d36ec58 | 345 | |
6ea0a69c JB |
346 | req = rcu_dereference_protected(local->scan_req, |
347 | lockdep_is_held(&local->mtx)); | |
348 | ||
a754055a EG |
349 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
350 | return false; | |
351 | ||
30686bf7 | 352 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
4d36ec58 | 353 | for (i = 0; i < req->n_channels; i++) { |
c56ef672 DS |
354 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
355 | bands_used |= BIT(req->channels[i]->band); | |
356 | } | |
357 | ||
358 | n_chans = req->n_channels; | |
359 | } else { | |
360 | do { | |
57fbcce3 | 361 | if (local->hw_scan_band == NUM_NL80211_BANDS) |
c56ef672 DS |
362 | return false; |
363 | ||
364 | n_chans = 0; | |
365 | ||
366 | for (i = 0; i < req->n_channels; i++) { | |
367 | if (req->channels[i]->band != | |
368 | local->hw_scan_band) | |
369 | continue; | |
370 | local->hw_scan_req->req.channels[n_chans] = | |
4d36ec58 JB |
371 | req->channels[i]; |
372 | n_chans++; | |
c56ef672 | 373 | bands_used |= BIT(req->channels[i]->band); |
4d36ec58 | 374 | } |
4d36ec58 | 375 | |
c56ef672 DS |
376 | local->hw_scan_band++; |
377 | } while (!n_chans); | |
378 | } | |
4d36ec58 | 379 | |
c56ef672 | 380 | local->hw_scan_req->req.n_channels = n_chans; |
2103dec1 | 381 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
4d36ec58 | 382 | |
b9771d41 JB |
383 | if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
384 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; | |
385 | ||
2ad2274c | 386 | ielen = ieee80211_build_preq_ies(sdata, |
c56ef672 | 387 | (u8 *)local->hw_scan_req->req.ie, |
c604b9f2 | 388 | local->hw_scan_ies_bufsize, |
c56ef672 DS |
389 | &local->hw_scan_req->ies, |
390 | req->ie, req->ie_len, | |
b9771d41 JB |
391 | bands_used, req->rates, &chandef, |
392 | flags); | |
c56ef672 DS |
393 | local->hw_scan_req->req.ie_len = ielen; |
394 | local->hw_scan_req->req.no_cck = req->no_cck; | |
a344d677 JB |
395 | ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); |
396 | ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, | |
397 | req->mac_addr_mask); | |
e345f44f | 398 | ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); |
4d36ec58 JB |
399 | |
400 | return true; | |
401 | } | |
402 | ||
8bd2a248 | 403 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
404 | { |
405 | struct ieee80211_local *local = hw_to_local(hw); | |
e9da68dd | 406 | bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
a2b70e83 | 407 | bool was_scanning = local->scanning; |
6ea0a69c | 408 | struct cfg80211_scan_request *scan_req; |
a344d677 | 409 | struct ieee80211_sub_if_data *scan_sdata; |
4fa11ec7 | 410 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 411 | |
e229f844 | 412 | lockdep_assert_held(&local->mtx); |
5bc75728 | 413 | |
6d3560d4 JB |
414 | /* |
415 | * It's ok to abort a not-yet-running scan (that | |
416 | * we have one at all will be verified by checking | |
417 | * local->scan_req next), but not to complete it | |
418 | * successfully. | |
419 | */ | |
420 | if (WARN_ON(!local->scanning && !aborted)) | |
421 | aborted = true; | |
5bc75728 | 422 | |
e229f844 | 423 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 424 | return; |
de95a54b | 425 | |
2ad2274c IP |
426 | scan_sdata = rcu_dereference_protected(local->scan_sdata, |
427 | lockdep_is_held(&local->mtx)); | |
428 | ||
c56ef672 | 429 | if (hw_scan && !aborted && |
30686bf7 | 430 | !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && |
2ad2274c | 431 | ieee80211_prep_hw_scan(scan_sdata)) { |
e2fd5dbc JB |
432 | int rc; |
433 | ||
434 | rc = drv_hw_scan(local, | |
435 | rcu_dereference_protected(local->scan_sdata, | |
436 | lockdep_is_held(&local->mtx)), | |
437 | local->hw_scan_req); | |
438 | ||
6eb11a9a | 439 | if (rc == 0) |
d07bfd8b | 440 | return; |
7947d3e0 | 441 | |
7d10f6b1 JB |
442 | /* HW scan failed and is going to be reported as aborted, |
443 | * so clear old scan info. | |
7947d3e0 AS |
444 | */ |
445 | memset(&local->scan_info, 0, sizeof(local->scan_info)); | |
7d10f6b1 | 446 | aborted = true; |
4d36ec58 JB |
447 | } |
448 | ||
449 | kfree(local->hw_scan_req); | |
450 | local->hw_scan_req = NULL; | |
f3b85252 | 451 | |
6ea0a69c JB |
452 | scan_req = rcu_dereference_protected(local->scan_req, |
453 | lockdep_is_held(&local->mtx)); | |
454 | ||
6ea0a69c | 455 | RCU_INIT_POINTER(local->scan_req, NULL); |
0c2bef46 | 456 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
2a519311 | 457 | |
fbe9c429 | 458 | local->scanning = 0; |
7ca15a0a | 459 | local->scan_chandef.chan = NULL; |
f3b85252 | 460 | |
60deb9f1 SRP |
461 | synchronize_rcu(); |
462 | ||
463 | if (scan_req != local->int_scan_req) { | |
464 | local->scan_info.aborted = aborted; | |
465 | cfg80211_scan_done(scan_req, &local->scan_info); | |
466 | } | |
467 | ||
07ef03ee JB |
468 | /* Set power back to normal operating levels. */ |
469 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 470 | |
a033afca | 471 | if (!hw_scan && was_scanning) { |
e229f844 | 472 | ieee80211_configure_filter(local); |
a344d677 | 473 | drv_sw_scan_complete(local, scan_sdata); |
aacde9ee | 474 | ieee80211_offchannel_return(local); |
e229f844 | 475 | } |
0a51b27e | 476 | |
5cff20e6 | 477 | ieee80211_recalc_idle(local); |
e229f844 | 478 | |
0a51b27e | 479 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 480 | ieee80211_ibss_notify_scan_completed(local); |
4fa11ec7 SK |
481 | |
482 | /* Requeue all the work that might have been ignored while | |
483 | * the scan was in progress; if there was none this will | |
484 | * just be a no-op for the particular interface. | |
485 | */ | |
486 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
487 | if (ieee80211_sdata_running(sdata)) | |
16114496 | 488 | wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); |
4fa11ec7 SK |
489 | } |
490 | ||
a2b70e83 EP |
491 | if (was_scanning) |
492 | ieee80211_start_next_roc(local); | |
0a51b27e | 493 | } |
8789d459 | 494 | |
7947d3e0 AS |
495 | void ieee80211_scan_completed(struct ieee80211_hw *hw, |
496 | struct cfg80211_scan_info *info) | |
8789d459 JB |
497 | { |
498 | struct ieee80211_local *local = hw_to_local(hw); | |
499 | ||
58bd7f11 | 500 | trace_api_scan_completed(local, info->aborted); |
8789d459 JB |
501 | |
502 | set_bit(SCAN_COMPLETED, &local->scanning); | |
7947d3e0 | 503 | if (info->aborted) |
8789d459 | 504 | set_bit(SCAN_ABORTED, &local->scanning); |
7947d3e0 AS |
505 | |
506 | memcpy(&local->scan_info, info, sizeof(*info)); | |
507 | ||
8789d459 JB |
508 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); |
509 | } | |
0a51b27e JB |
510 | EXPORT_SYMBOL(ieee80211_scan_completed); |
511 | ||
a344d677 JB |
512 | static int ieee80211_start_sw_scan(struct ieee80211_local *local, |
513 | struct ieee80211_sub_if_data *sdata) | |
f3b85252 | 514 | { |
fe57d9f5 JB |
515 | /* Software scan is not supported in multi-channel cases */ |
516 | if (local->use_chanctx) | |
517 | return -EOPNOTSUPP; | |
518 | ||
f3b85252 JB |
519 | /* |
520 | * Hardware/driver doesn't support hw_scan, so use software | |
521 | * scanning instead. First send a nullfunc frame with power save | |
522 | * bit on so that AP will buffer the frames for us while we are not | |
523 | * listening, then send probe requests to each channel and wait for | |
524 | * the responses. After all channels are scanned, tune back to the | |
525 | * original channel and send a nullfunc frame with power save bit | |
526 | * off to trigger the AP to send us all the buffered frames. | |
527 | * | |
528 | * Note that while local->sw_scanning is true everything else but | |
529 | * nullfunc frames and probe requests will be dropped in | |
530 | * ieee80211_tx_h_check_assoc(). | |
531 | */ | |
a344d677 | 532 | drv_sw_scan_start(local, sdata, local->scan_addr); |
f3b85252 | 533 | |
de312db3 | 534 | local->leave_oper_channel_time = jiffies; |
977923b0 | 535 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
536 | local->scan_channel_idx = 0; |
537 | ||
aacde9ee | 538 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 539 | |
9c35d7d2 | 540 | /* ensure nullfunc is transmitted before leaving operating channel */ |
3b24f4c6 | 541 | ieee80211_flush_queues(local, NULL, false); |
9c35d7d2 | 542 | |
3ac64bee | 543 | ieee80211_configure_filter(local); |
f3b85252 | 544 | |
59bdf3b0 BG |
545 | /* We need to set power level at maximum rate for scanning. */ |
546 | ieee80211_hw_config(local, 0); | |
547 | ||
42935eca | 548 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 549 | &local->scan_work, 0); |
f3b85252 JB |
550 | |
551 | return 0; | |
552 | } | |
553 | ||
dc0c18ed AK |
554 | static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata) |
555 | { | |
556 | struct ieee80211_local *local = sdata->local; | |
557 | struct ieee80211_sub_if_data *sdata_iter; | |
558 | ||
559 | if (!ieee80211_is_radar_required(local)) | |
560 | return true; | |
561 | ||
562 | if (!regulatory_pre_cac_allowed(local->hw.wiphy)) | |
563 | return false; | |
564 | ||
565 | mutex_lock(&local->iflist_mtx); | |
566 | list_for_each_entry(sdata_iter, &local->interfaces, list) { | |
567 | if (sdata_iter->wdev.cac_started) { | |
568 | mutex_unlock(&local->iflist_mtx); | |
569 | return false; | |
570 | } | |
571 | } | |
572 | mutex_unlock(&local->iflist_mtx); | |
573 | ||
574 | return true; | |
575 | } | |
576 | ||
133d40f9 SG |
577 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
578 | struct ieee80211_sub_if_data *sdata) | |
579 | { | |
dc0c18ed | 580 | if (!__ieee80211_can_leave_ch(sdata)) |
164eb02d SW |
581 | return false; |
582 | ||
2eb278e0 | 583 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
584 | return false; |
585 | ||
586 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
392b9ffb | 587 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
133d40f9 SG |
588 | return false; |
589 | ||
590 | return true; | |
591 | } | |
592 | ||
593 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
594 | { | |
595 | lockdep_assert_held(&local->mtx); | |
596 | ||
597 | if (!local->scan_req || local->scanning) | |
598 | return; | |
599 | ||
e2fd5dbc JB |
600 | if (!ieee80211_can_scan(local, |
601 | rcu_dereference_protected( | |
602 | local->scan_sdata, | |
603 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
604 | return; |
605 | ||
606 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
607 | round_jiffies_relative(0)); | |
608 | } | |
f3b85252 | 609 | |
45ad6834 JB |
610 | static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, |
611 | const u8 *src, const u8 *dst, | |
612 | const u8 *ssid, size_t ssid_len, | |
613 | const u8 *ie, size_t ie_len, | |
614 | u32 ratemask, u32 flags, u32 tx_flags, | |
615 | struct ieee80211_channel *channel) | |
616 | { | |
617 | struct sk_buff *skb; | |
618 | ||
619 | skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel, | |
620 | ssid, ssid_len, | |
621 | ie, ie_len, flags); | |
b9771d41 | 622 | |
45ad6834 | 623 | if (skb) { |
b9771d41 JB |
624 | if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { |
625 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
2b3dab13 | 626 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
7e3cf084 | 627 | u16 sn = get_random_u16(); |
b9771d41 | 628 | |
2b3dab13 | 629 | info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; |
b9771d41 JB |
630 | hdr->seq_ctrl = |
631 | cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); | |
632 | } | |
45ad6834 | 633 | IEEE80211_SKB_CB(skb)->flags |= tx_flags; |
08aca29a | 634 | ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band); |
45ad6834 JB |
635 | } |
636 | } | |
637 | ||
8a690674 BG |
638 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
639 | unsigned long *next_delay) | |
640 | { | |
641 | int i; | |
e2fd5dbc | 642 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 643 | struct cfg80211_scan_request *scan_req; |
57fbcce3 | 644 | enum nl80211_band band = local->hw.conf.chandef.chan->band; |
b9771d41 | 645 | u32 flags = 0, tx_flags; |
6c17b77b | 646 | |
6ea0a69c JB |
647 | scan_req = rcu_dereference_protected(local->scan_req, |
648 | lockdep_is_held(&local->mtx)); | |
649 | ||
6c17b77b | 650 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
6ea0a69c | 651 | if (scan_req->no_cck) |
6c17b77b | 652 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
b9771d41 JB |
653 | if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
654 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; | |
655 | if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) | |
656 | flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; | |
8a690674 | 657 | |
e2fd5dbc | 658 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 659 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 660 | |
6ea0a69c | 661 | for (i = 0; i < scan_req->n_ssids; i++) |
45ad6834 | 662 | ieee80211_send_scan_probe_req( |
e345f44f | 663 | sdata, local->scan_addr, scan_req->bssid, |
6ea0a69c JB |
664 | scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, |
665 | scan_req->ie, scan_req->ie_len, | |
b9771d41 | 666 | scan_req->rates[band], flags, |
45ad6834 | 667 | tx_flags, local->hw.conf.chandef.chan); |
8a690674 BG |
668 | |
669 | /* | |
670 | * After sending probe requests, wait for probe responses | |
671 | * on the channel. | |
672 | */ | |
673 | *next_delay = IEEE80211_CHANNEL_TIME; | |
674 | local->next_scan_state = SCAN_DECISION; | |
675 | } | |
676 | ||
f3b85252 JB |
677 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
678 | struct cfg80211_scan_request *req) | |
679 | { | |
680 | struct ieee80211_local *local = sdata->local; | |
e9da68dd | 681 | bool hw_scan = local->ops->hw_scan; |
f3b85252 JB |
682 | int rc; |
683 | ||
e229f844 SG |
684 | lockdep_assert_held(&local->mtx); |
685 | ||
dc0c18ed AK |
686 | if (local->scan_req) |
687 | return -EBUSY; | |
688 | ||
689 | if (!__ieee80211_can_leave_ch(sdata)) | |
f3b85252 JB |
690 | return -EBUSY; |
691 | ||
133d40f9 | 692 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 693 | /* wait for the work to finish/time out */ |
6ea0a69c | 694 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 695 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
696 | return 0; |
697 | } | |
698 | ||
e9da68dd JB |
699 | again: |
700 | if (hw_scan) { | |
f3b85252 | 701 | u8 *ies; |
f3b85252 | 702 | |
e4dcbb37 | 703 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
c56ef672 | 704 | |
30686bf7 | 705 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
c56ef672 DS |
706 | int i, n_bands = 0; |
707 | u8 bands_counted = 0; | |
708 | ||
709 | for (i = 0; i < req->n_channels; i++) { | |
710 | if (bands_counted & BIT(req->channels[i]->band)) | |
711 | continue; | |
712 | bands_counted |= BIT(req->channels[i]->band); | |
713 | n_bands++; | |
714 | } | |
715 | ||
716 | local->hw_scan_ies_bufsize *= n_bands; | |
717 | } | |
718 | ||
4d36ec58 JB |
719 | local->hw_scan_req = kmalloc( |
720 | sizeof(*local->hw_scan_req) + | |
721 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 722 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 723 | if (!local->hw_scan_req) |
f3b85252 JB |
724 | return -ENOMEM; |
725 | ||
c56ef672 DS |
726 | local->hw_scan_req->req.ssids = req->ssids; |
727 | local->hw_scan_req->req.n_ssids = req->n_ssids; | |
4d36ec58 JB |
728 | ies = (u8 *)local->hw_scan_req + |
729 | sizeof(*local->hw_scan_req) + | |
730 | req->n_channels * sizeof(req->channels[0]); | |
c56ef672 DS |
731 | local->hw_scan_req->req.ie = ies; |
732 | local->hw_scan_req->req.flags = req->flags; | |
e345f44f | 733 | eth_broadcast_addr(local->hw_scan_req->req.bssid); |
7947d3e0 AS |
734 | local->hw_scan_req->req.duration = req->duration; |
735 | local->hw_scan_req->req.duration_mandatory = | |
736 | req->duration_mandatory; | |
4d36ec58 JB |
737 | |
738 | local->hw_scan_band = 0; | |
c8cb5b85 TM |
739 | local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params; |
740 | local->hw_scan_req->req.scan_6ghz_params = | |
741 | req->scan_6ghz_params; | |
742 | local->hw_scan_req->req.scan_6ghz = req->scan_6ghz; | |
6e7e6213 JL |
743 | |
744 | /* | |
745 | * After allocating local->hw_scan_req, we must | |
746 | * go through until ieee80211_prep_hw_scan(), so | |
747 | * anything that might be changed here and leave | |
748 | * this function early must not go after this | |
749 | * allocation. | |
750 | */ | |
f3b85252 JB |
751 | } |
752 | ||
6ea0a69c | 753 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 754 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 755 | |
a344d677 JB |
756 | if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
757 | get_random_mask_addr(local->scan_addr, | |
758 | req->mac_addr, | |
759 | req->mac_addr_mask); | |
760 | else | |
761 | memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); | |
762 | ||
e9da68dd | 763 | if (hw_scan) { |
fbe9c429 | 764 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 765 | } else if ((req->n_channels == 1) && |
675a0b04 | 766 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
767 | /* |
768 | * If we are scanning only on the operating channel | |
769 | * then we do not need to stop normal activities | |
8a690674 BG |
770 | */ |
771 | unsigned long next_delay; | |
772 | ||
773 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
774 | ||
775 | ieee80211_recalc_idle(local); | |
776 | ||
777 | /* Notify driver scan is starting, keep order of operations | |
778 | * same as normal software scan, in case that matters. */ | |
a344d677 | 779 | drv_sw_scan_start(local, sdata, local->scan_addr); |
8a690674 BG |
780 | |
781 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
782 | ||
783 | /* We need to ensure power level is at max for scanning. */ | |
784 | ieee80211_hw_config(local, 0); | |
785 | ||
4e39ccac AQ |
786 | if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | |
787 | IEEE80211_CHAN_RADAR)) || | |
6ea0a69c | 788 | !req->n_ssids) { |
8a690674 | 789 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
b041b7b9 FF |
790 | if (req->n_ssids) |
791 | set_bit(SCAN_BEACON_WAIT, &local->scanning); | |
8a690674 BG |
792 | } else { |
793 | ieee80211_scan_state_send_probe(local, &next_delay); | |
794 | next_delay = IEEE80211_CHANNEL_TIME; | |
795 | } | |
796 | ||
797 | /* Now, just wait a bit and we are all done! */ | |
798 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
799 | next_delay); | |
800 | return 0; | |
801 | } else { | |
802 | /* Do normal software scan */ | |
fbe9c429 | 803 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 804 | } |
6e7e6213 | 805 | |
5cff20e6 | 806 | ieee80211_recalc_idle(local); |
f3b85252 | 807 | |
e9da68dd | 808 | if (hw_scan) { |
2ad2274c | 809 | WARN_ON(!ieee80211_prep_hw_scan(sdata)); |
a060bbfe | 810 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
a344d677 JB |
811 | } else { |
812 | rc = ieee80211_start_sw_scan(local, sdata); | |
813 | } | |
f3b85252 | 814 | |
f3b85252 | 815 | if (rc) { |
4d36ec58 JB |
816 | kfree(local->hw_scan_req); |
817 | local->hw_scan_req = NULL; | |
fbe9c429 | 818 | local->scanning = 0; |
f3b85252 | 819 | |
5cff20e6 JB |
820 | ieee80211_recalc_idle(local); |
821 | ||
f3b85252 | 822 | local->scan_req = NULL; |
0c2bef46 | 823 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 JB |
824 | } |
825 | ||
e9da68dd JB |
826 | if (hw_scan && rc == 1) { |
827 | /* | |
828 | * we can't fall back to software for P2P-GO | |
829 | * as it must update NoA etc. | |
830 | */ | |
831 | if (ieee80211_vif_type_p2p(&sdata->vif) == | |
832 | NL80211_IFTYPE_P2P_GO) | |
833 | return -EOPNOTSUPP; | |
834 | hw_scan = false; | |
835 | goto again; | |
836 | } | |
837 | ||
f3b85252 JB |
838 | return rc; |
839 | } | |
840 | ||
df13cce5 HS |
841 | static unsigned long |
842 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
843 | { | |
844 | /* | |
845 | * TODO: channel switching also consumes quite some time, | |
846 | * add that delay as well to get a better estimation | |
847 | */ | |
4e39ccac | 848 | if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) |
df13cce5 HS |
849 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
850 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
851 | } | |
852 | ||
e229f844 SG |
853 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
854 | unsigned long *next_delay) | |
7d3be3cc | 855 | { |
142b9f50 | 856 | bool associated = false; |
df13cce5 HS |
857 | bool tx_empty = true; |
858 | bool bad_latency; | |
142b9f50 | 859 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 860 | struct ieee80211_channel *next_chan; |
cd2bb512 | 861 | enum mac80211_scan_state next_scan_state; |
6ea0a69c | 862 | struct cfg80211_scan_request *scan_req; |
142b9f50 | 863 | |
df13cce5 HS |
864 | /* |
865 | * check if at least one STA interface is associated, | |
866 | * check if at least one STA interface has pending tx frames | |
867 | * and grab the lowest used beacon interval | |
868 | */ | |
142b9f50 HS |
869 | mutex_lock(&local->iflist_mtx); |
870 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 871 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
872 | continue; |
873 | ||
874 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
875 | if (sdata->u.mgd.associated) { | |
876 | associated = true; | |
df13cce5 | 877 | |
df13cce5 HS |
878 | if (!qdisc_all_tx_empty(sdata->dev)) { |
879 | tx_empty = false; | |
880 | break; | |
881 | } | |
142b9f50 HS |
882 | } |
883 | } | |
884 | } | |
885 | mutex_unlock(&local->iflist_mtx); | |
886 | ||
6ea0a69c JB |
887 | scan_req = rcu_dereference_protected(local->scan_req, |
888 | lockdep_is_held(&local->mtx)); | |
889 | ||
890 | next_chan = scan_req->channels[local->scan_channel_idx]; | |
b23b025f | 891 | |
a80f7c0b | 892 | /* |
07ef03ee JB |
893 | * we're currently scanning a different channel, let's |
894 | * see if we can scan another channel without interfering | |
895 | * with the current traffic situation. | |
896 | * | |
3f892b61 | 897 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 898 | */ |
a80f7c0b | 899 | |
07ef03ee | 900 | bad_latency = time_after(jiffies + |
3f892b61 SG |
901 | ieee80211_scan_get_channel_time(next_chan), |
902 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 903 | |
cd2bb512 | 904 | if (associated && !tx_empty) { |
6ea0a69c | 905 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
cd2bb512 SL |
906 | next_scan_state = SCAN_ABORT; |
907 | else | |
908 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 909 | } else if (associated && bad_latency) { |
cd2bb512 SL |
910 | next_scan_state = SCAN_SUSPEND; |
911 | } else { | |
912 | next_scan_state = SCAN_SET_CHANNEL; | |
913 | } | |
914 | ||
915 | local->next_scan_state = next_scan_state; | |
142b9f50 | 916 | |
07ef03ee | 917 | *next_delay = 0; |
142b9f50 HS |
918 | } |
919 | ||
2fb3f028 HS |
920 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
921 | unsigned long *next_delay) | |
922 | { | |
923 | int skip; | |
924 | struct ieee80211_channel *chan; | |
7ca15a0a | 925 | enum nl80211_bss_scan_width oper_scan_width; |
6ea0a69c JB |
926 | struct cfg80211_scan_request *scan_req; |
927 | ||
928 | scan_req = rcu_dereference_protected(local->scan_req, | |
929 | lockdep_is_held(&local->mtx)); | |
2fb3f028 | 930 | |
7d3be3cc | 931 | skip = 0; |
6ea0a69c | 932 | chan = scan_req->channels[local->scan_channel_idx]; |
7d3be3cc | 933 | |
7ca15a0a SW |
934 | local->scan_chandef.chan = chan; |
935 | local->scan_chandef.center_freq1 = chan->center_freq; | |
b6011960 | 936 | local->scan_chandef.freq1_offset = chan->freq_offset; |
7ca15a0a | 937 | local->scan_chandef.center_freq2 = 0; |
75b15935 TP |
938 | |
939 | /* For scanning on the S1G band, ignore scan_width (which is constant | |
940 | * across all channels) for now since channel width is specific to each | |
941 | * channel. Detect the required channel width here and likely revisit | |
942 | * later. Maybe scan_width could be used to build the channel scan list? | |
943 | */ | |
944 | if (chan->band == NL80211_BAND_S1GHZ) { | |
945 | local->scan_chandef.width = ieee80211_s1g_channel_width(chan); | |
946 | goto set_channel; | |
947 | } | |
948 | ||
6ea0a69c | 949 | switch (scan_req->scan_width) { |
7ca15a0a SW |
950 | case NL80211_BSS_CHAN_WIDTH_5: |
951 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; | |
952 | break; | |
953 | case NL80211_BSS_CHAN_WIDTH_10: | |
954 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; | |
955 | break; | |
df78a0c0 | 956 | default: |
7ca15a0a SW |
957 | case NL80211_BSS_CHAN_WIDTH_20: |
958 | /* If scanning on oper channel, use whatever channel-type | |
959 | * is currently in use. | |
960 | */ | |
961 | oper_scan_width = cfg80211_chandef_to_scan_width( | |
962 | &local->_oper_chandef); | |
963 | if (chan == local->_oper_chandef.chan && | |
6ea0a69c | 964 | oper_scan_width == scan_req->scan_width) |
7ca15a0a SW |
965 | local->scan_chandef = local->_oper_chandef; |
966 | else | |
967 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; | |
968 | break; | |
75b15935 TP |
969 | case NL80211_BSS_CHAN_WIDTH_1: |
970 | case NL80211_BSS_CHAN_WIDTH_2: | |
971 | /* shouldn't get here, S1G handled above */ | |
972 | WARN_ON(1); | |
973 | break; | |
7ca15a0a | 974 | } |
b23b025f | 975 | |
75b15935 | 976 | set_channel: |
07ef03ee JB |
977 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
978 | skip = 1; | |
7d3be3cc | 979 | |
7d3be3cc HS |
980 | /* advance state machine to next channel/band */ |
981 | local->scan_channel_idx++; | |
982 | ||
0ee9c13c HS |
983 | if (skip) { |
984 | /* if we skip this channel return to the decision state */ | |
985 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 986 | return; |
0ee9c13c | 987 | } |
7d3be3cc HS |
988 | |
989 | /* | |
990 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
991 | * (which unfortunately doesn't say _why_ step a) is done, | |
992 | * but it waits for the probe delay or until a frame is | |
993 | * received - and the received frame would update the NAV). | |
994 | * For now, we do not support waiting until a frame is | |
995 | * received. | |
996 | * | |
997 | * In any case, it is not necessary for a passive scan. | |
998 | */ | |
4e39ccac AQ |
999 | if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || |
1000 | !scan_req->n_ssids) { | |
7d3be3cc | 1001 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
977923b0 | 1002 | local->next_scan_state = SCAN_DECISION; |
b041b7b9 FF |
1003 | if (scan_req->n_ssids) |
1004 | set_bit(SCAN_BEACON_WAIT, &local->scanning); | |
2fb3f028 | 1005 | return; |
7d3be3cc HS |
1006 | } |
1007 | ||
2fb3f028 | 1008 | /* active scan, send probes */ |
7d3be3cc | 1009 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 1010 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
1011 | } |
1012 | ||
07ef03ee JB |
1013 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
1014 | unsigned long *next_delay) | |
1015 | { | |
1016 | /* switch back to the operating channel */ | |
7ca15a0a | 1017 | local->scan_chandef.chan = NULL; |
07ef03ee JB |
1018 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
1019 | ||
aacde9ee SG |
1020 | /* disable PS */ |
1021 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
1022 | |
1023 | *next_delay = HZ / 5; | |
1024 | /* afterwards, resume scan & go to next channel */ | |
1025 | local->next_scan_state = SCAN_RESUME; | |
1026 | } | |
1027 | ||
1028 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
1029 | unsigned long *next_delay) | |
1030 | { | |
aacde9ee | 1031 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
1032 | |
1033 | if (local->ops->flush) { | |
3b24f4c6 | 1034 | ieee80211_flush_queues(local, NULL, false); |
07ef03ee JB |
1035 | *next_delay = 0; |
1036 | } else | |
1037 | *next_delay = HZ / 10; | |
1038 | ||
1039 | /* remember when we left the operating channel */ | |
1040 | local->leave_oper_channel_time = jiffies; | |
1041 | ||
1042 | /* advance to the next channel to be scanned */ | |
de2ee84d | 1043 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
1044 | } |
1045 | ||
c2b13452 | 1046 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
1047 | { |
1048 | struct ieee80211_local *local = | |
1049 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 1050 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 1051 | struct cfg80211_scan_request *scan_req; |
0a51b27e | 1052 | unsigned long next_delay = 0; |
8bd2a248 | 1053 | bool aborted; |
0a51b27e | 1054 | |
259b62e3 | 1055 | mutex_lock(&local->mtx); |
8789d459 | 1056 | |
332ff7fe LC |
1057 | if (!ieee80211_can_run_worker(local)) { |
1058 | aborted = true; | |
1059 | goto out_complete; | |
1060 | } | |
1061 | ||
e2fd5dbc JB |
1062 | sdata = rcu_dereference_protected(local->scan_sdata, |
1063 | lockdep_is_held(&local->mtx)); | |
6ea0a69c JB |
1064 | scan_req = rcu_dereference_protected(local->scan_req, |
1065 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 1066 | |
8a690674 BG |
1067 | /* When scanning on-channel, the first-callback means completed. */ |
1068 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
1069 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
1070 | goto out_complete; | |
1071 | } | |
1072 | ||
259b62e3 | 1073 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 1074 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 1075 | goto out_complete; |
8789d459 JB |
1076 | } |
1077 | ||
6ea0a69c | 1078 | if (!sdata || !scan_req) |
259b62e3 | 1079 | goto out; |
f3b85252 | 1080 | |
ff5db439 | 1081 | if (!local->scanning) { |
f3b85252 JB |
1082 | int rc; |
1083 | ||
6ea0a69c | 1084 | RCU_INIT_POINTER(local->scan_req, NULL); |
0c2bef46 | 1085 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 | 1086 | |
6ea0a69c | 1087 | rc = __ieee80211_start_scan(sdata, scan_req); |
259b62e3 | 1088 | if (rc) { |
3aed49ef | 1089 | /* need to complete scan in cfg80211 */ |
6ea0a69c | 1090 | rcu_assign_pointer(local->scan_req, scan_req); |
259b62e3 SG |
1091 | aborted = true; |
1092 | goto out_complete; | |
1093 | } else | |
1094 | goto out; | |
f3b85252 JB |
1095 | } |
1096 | ||
b041b7b9 FF |
1097 | clear_bit(SCAN_BEACON_WAIT, &local->scanning); |
1098 | ||
f502d09b HS |
1099 | /* |
1100 | * as long as no delay is required advance immediately | |
1101 | * without scheduling a new work | |
1102 | */ | |
1103 | do { | |
c29acf20 RM |
1104 | if (!ieee80211_sdata_running(sdata)) { |
1105 | aborted = true; | |
1106 | goto out_complete; | |
1107 | } | |
1108 | ||
b041b7b9 FF |
1109 | if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) && |
1110 | local->next_scan_state == SCAN_DECISION) | |
1111 | local->next_scan_state = SCAN_SEND_PROBE; | |
1112 | ||
977923b0 | 1113 | switch (local->next_scan_state) { |
2fb3f028 | 1114 | case SCAN_DECISION: |
e229f844 | 1115 | /* if no more bands/channels left, complete scan */ |
6ea0a69c | 1116 | if (local->scan_channel_idx >= scan_req->n_channels) { |
e229f844 SG |
1117 | aborted = false; |
1118 | goto out_complete; | |
1119 | } | |
1120 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 1121 | break; |
2fb3f028 HS |
1122 | case SCAN_SET_CHANNEL: |
1123 | ieee80211_scan_state_set_channel(local, &next_delay); | |
1124 | break; | |
f502d09b HS |
1125 | case SCAN_SEND_PROBE: |
1126 | ieee80211_scan_state_send_probe(local, &next_delay); | |
1127 | break; | |
07ef03ee JB |
1128 | case SCAN_SUSPEND: |
1129 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 1130 | break; |
07ef03ee JB |
1131 | case SCAN_RESUME: |
1132 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 1133 | break; |
cd2bb512 SL |
1134 | case SCAN_ABORT: |
1135 | aborted = true; | |
1136 | goto out_complete; | |
f502d09b HS |
1137 | } |
1138 | } while (next_delay == 0); | |
0a51b27e | 1139 | |
42935eca | 1140 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 1141 | goto out; |
259b62e3 SG |
1142 | |
1143 | out_complete: | |
8bd2a248 | 1144 | __ieee80211_scan_completed(&local->hw, aborted); |
259b62e3 SG |
1145 | out: |
1146 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
1147 | } |
1148 | ||
f3b85252 JB |
1149 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
1150 | struct cfg80211_scan_request *req) | |
0a51b27e | 1151 | { |
f3b85252 | 1152 | int res; |
de95a54b | 1153 | |
a1699b75 | 1154 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 1155 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 1156 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 1157 | |
f3b85252 | 1158 | return res; |
0a51b27e JB |
1159 | } |
1160 | ||
34bcf715 SG |
1161 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
1162 | const u8 *ssid, u8 ssid_len, | |
76bed0f4 JD |
1163 | struct ieee80211_channel **channels, |
1164 | unsigned int n_channels, | |
7ca15a0a | 1165 | enum nl80211_bss_scan_width scan_width) |
0a51b27e | 1166 | { |
0a51b27e | 1167 | struct ieee80211_local *local = sdata->local; |
76bed0f4 | 1168 | int ret = -EBUSY, i, n_ch = 0; |
57fbcce3 | 1169 | enum nl80211_band band; |
2a519311 | 1170 | |
a1699b75 | 1171 | mutex_lock(&local->mtx); |
0a51b27e | 1172 | |
f3b85252 JB |
1173 | /* busy scanning */ |
1174 | if (local->scan_req) | |
1175 | goto unlock; | |
9116dd01 | 1176 | |
be4a4b6a | 1177 | /* fill internal scan request */ |
76bed0f4 JD |
1178 | if (!channels) { |
1179 | int max_n; | |
be4a4b6a | 1180 | |
57fbcce3 | 1181 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
c8cb5b85 TM |
1182 | if (!local->hw.wiphy->bands[band] || |
1183 | band == NL80211_BAND_6GHZ) | |
be4a4b6a | 1184 | continue; |
34bcf715 SG |
1185 | |
1186 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
1187 | for (i = 0; i < max_n; i++) { | |
1188 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 1189 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 | 1190 | |
8fe02e16 | 1191 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
1192 | IEEE80211_CHAN_DISABLED)) |
1193 | continue; | |
1194 | ||
1195 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
1196 | n_ch++; | |
be4a4b6a JB |
1197 | } |
1198 | } | |
1199 | ||
34bcf715 SG |
1200 | if (WARN_ON_ONCE(n_ch == 0)) |
1201 | goto unlock; | |
1202 | ||
1203 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 1204 | } else { |
76bed0f4 JD |
1205 | for (i = 0; i < n_channels; i++) { |
1206 | if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | | |
1207 | IEEE80211_CHAN_DISABLED)) | |
1208 | continue; | |
1209 | ||
1210 | local->int_scan_req->channels[n_ch] = channels[i]; | |
1211 | n_ch++; | |
1212 | } | |
1213 | ||
1214 | if (WARN_ON_ONCE(n_ch == 0)) | |
34bcf715 SG |
1215 | goto unlock; |
1216 | ||
76bed0f4 | 1217 | local->int_scan_req->n_channels = n_ch; |
be4a4b6a JB |
1218 | } |
1219 | ||
1220 | local->int_scan_req->ssids = &local->scan_ssid; | |
1221 | local->int_scan_req->n_ssids = 1; | |
7ca15a0a | 1222 | local->int_scan_req->scan_width = scan_width; |
5ba63533 JB |
1223 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
1224 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 1225 | |
5ba63533 | 1226 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 1227 | unlock: |
a1699b75 | 1228 | mutex_unlock(&local->mtx); |
f3b85252 | 1229 | return ret; |
0a51b27e | 1230 | } |
5bb644a0 JB |
1231 | |
1232 | void ieee80211_scan_cancel(struct ieee80211_local *local) | |
1233 | { | |
0fd3af61 JB |
1234 | /* ensure a new scan cannot be queued */ |
1235 | lockdep_assert_wiphy(local->hw.wiphy); | |
1236 | ||
5bb644a0 | 1237 | /* |
b856439b | 1238 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
1239 | * yet really started (see __ieee80211_start_scan ). |
1240 | * | |
1241 | * Regarding hardware scan: | |
1242 | * - we can not call __ieee80211_scan_completed() as when | |
1243 | * SCAN_HW_SCANNING bit is set this function change | |
1244 | * local->hw_scan_req to operate on 5G band, what race with | |
1245 | * driver which can use local->hw_scan_req | |
1246 | * | |
1247 | * - we can not cancel scan_work since driver can schedule it | |
1248 | * by ieee80211_scan_completed(..., true) to finish scan | |
1249 | * | |
b856439b EP |
1250 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
1251 | * driver is still responsible for calling ieee80211_scan_completed() | |
1252 | * after the scan was completed/aborted. | |
5bb644a0 | 1253 | */ |
4136c422 | 1254 | |
a1699b75 | 1255 | mutex_lock(&local->mtx); |
b856439b EP |
1256 | if (!local->scan_req) |
1257 | goto out; | |
1258 | ||
a754055a EG |
1259 | /* |
1260 | * We have a scan running and the driver already reported completion, | |
1261 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
1262 | * cancelled. | |
1263 | */ | |
1264 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
1265 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
1266 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
1267 | goto out; | |
1268 | } | |
1269 | ||
b856439b | 1270 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
a754055a EG |
1271 | /* |
1272 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
1273 | * scan on another band. | |
1274 | */ | |
1275 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 1276 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
1277 | drv_cancel_hw_scan(local, |
1278 | rcu_dereference_protected(local->scan_sdata, | |
1279 | lockdep_is_held(&local->mtx))); | |
b856439b | 1280 | goto out; |
4136c422 | 1281 | } |
b856439b EP |
1282 | |
1283 | /* | |
1284 | * If the work is currently running, it must be blocked on | |
1285 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
1286 | * simply exit once it acquires the mutex. | |
1287 | */ | |
1288 | cancel_delayed_work(&local->scan_work); | |
1289 | /* and clean up */ | |
7947d3e0 | 1290 | memset(&local->scan_info, 0, sizeof(local->scan_info)); |
8bd2a248 | 1291 | __ieee80211_scan_completed(&local->hw, true); |
b856439b | 1292 | out: |
d07bfd8b | 1293 | mutex_unlock(&local->mtx); |
5bb644a0 | 1294 | } |
79f460ca | 1295 | |
d43c6b6e DS |
1296 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1297 | struct cfg80211_sched_scan_request *req) | |
79f460ca LC |
1298 | { |
1299 | struct ieee80211_local *local = sdata->local; | |
633e2713 | 1300 | struct ieee80211_scan_ies sched_scan_ies = {}; |
2103dec1 | 1301 | struct cfg80211_chan_def chandef; |
633e2713 | 1302 | int ret, i, iebufsz, num_bands = 0; |
57fbcce3 | 1303 | u32 rate_masks[NUM_NL80211_BANDS] = {}; |
633e2713 DS |
1304 | u8 bands_used = 0; |
1305 | u8 *ie; | |
b9771d41 | 1306 | u32 flags = 0; |
c604b9f2 | 1307 | |
e4dcbb37 | 1308 | iebufsz = local->scan_ies_len + req->ie_len; |
79f460ca | 1309 | |
d43c6b6e | 1310 | lockdep_assert_held(&local->mtx); |
79f460ca | 1311 | |
d43c6b6e DS |
1312 | if (!local->ops->sched_scan_start) |
1313 | return -ENOTSUPP; | |
79f460ca | 1314 | |
57fbcce3 | 1315 | for (i = 0; i < NUM_NL80211_BANDS; i++) { |
633e2713 DS |
1316 | if (local->hw.wiphy->bands[i]) { |
1317 | bands_used |= BIT(i); | |
1318 | rate_masks[i] = (u32) -1; | |
1319 | num_bands++; | |
79f460ca | 1320 | } |
633e2713 | 1321 | } |
79f460ca | 1322 | |
b9771d41 JB |
1323 | if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
1324 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; | |
1325 | ||
6396bb22 | 1326 | ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); |
633e2713 DS |
1327 | if (!ie) { |
1328 | ret = -ENOMEM; | |
1329 | goto out; | |
79f460ca LC |
1330 | } |
1331 | ||
633e2713 DS |
1332 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
1333 | ||
2ad2274c | 1334 | ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz, |
cd5861bd | 1335 | &sched_scan_ies, req->ie, |
00387f32 | 1336 | req->ie_len, bands_used, rate_masks, &chandef, |
b9771d41 | 1337 | flags); |
633e2713 | 1338 | |
30dd3edf | 1339 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
d43c6b6e | 1340 | if (ret == 0) { |
5260a5b2 | 1341 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
6ea0a69c | 1342 | rcu_assign_pointer(local->sched_scan_req, req); |
d43c6b6e | 1343 | } |
79f460ca | 1344 | |
633e2713 | 1345 | kfree(ie); |
d43c6b6e | 1346 | |
633e2713 | 1347 | out: |
d43c6b6e DS |
1348 | if (ret) { |
1349 | /* Clean in case of failure after HW restart or upon resume. */ | |
0c2bef46 | 1350 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
6ea0a69c | 1351 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e DS |
1352 | } |
1353 | ||
1354 | return ret; | |
1355 | } | |
1356 | ||
1357 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
1358 | struct cfg80211_sched_scan_request *req) | |
1359 | { | |
1360 | struct ieee80211_local *local = sdata->local; | |
1361 | int ret; | |
1362 | ||
1363 | mutex_lock(&local->mtx); | |
1364 | ||
1365 | if (rcu_access_pointer(local->sched_scan_sdata)) { | |
1366 | mutex_unlock(&local->mtx); | |
1367 | return -EBUSY; | |
1368 | } | |
1369 | ||
1370 | ret = __ieee80211_request_sched_scan_start(sdata, req); | |
1371 | ||
5260a5b2 | 1372 | mutex_unlock(&local->mtx); |
79f460ca LC |
1373 | return ret; |
1374 | } | |
1375 | ||
0d440ea2 | 1376 | int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) |
79f460ca | 1377 | { |
0d440ea2 EP |
1378 | struct ieee80211_sub_if_data *sched_scan_sdata; |
1379 | int ret = -ENOENT; | |
79f460ca | 1380 | |
5260a5b2 | 1381 | mutex_lock(&local->mtx); |
79f460ca LC |
1382 | |
1383 | if (!local->ops->sched_scan_stop) { | |
1384 | ret = -ENOTSUPP; | |
1385 | goto out; | |
1386 | } | |
1387 | ||
d43c6b6e | 1388 | /* We don't want to restart sched scan anymore. */ |
6ea0a69c | 1389 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1390 | |
0d440ea2 EP |
1391 | sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, |
1392 | lockdep_is_held(&local->mtx)); | |
1393 | if (sched_scan_sdata) { | |
1394 | ret = drv_sched_scan_stop(local, sched_scan_sdata); | |
71228a1e | 1395 | if (!ret) |
ad053a96 | 1396 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
71228a1e | 1397 | } |
79f460ca | 1398 | out: |
5260a5b2 | 1399 | mutex_unlock(&local->mtx); |
79f460ca LC |
1400 | |
1401 | return ret; | |
1402 | } | |
1403 | ||
1404 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1405 | { | |
1406 | struct ieee80211_local *local = hw_to_local(hw); | |
1407 | ||
1408 | trace_api_sched_scan_results(local); | |
1409 | ||
b34939b9 | 1410 | cfg80211_sched_scan_results(hw->wiphy, 0); |
79f460ca LC |
1411 | } |
1412 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1413 | ||
f6837ba8 | 1414 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
85a9994a | 1415 | { |
85a9994a LC |
1416 | mutex_lock(&local->mtx); |
1417 | ||
5260a5b2 | 1418 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1419 | mutex_unlock(&local->mtx); |
1420 | return; | |
1421 | } | |
1422 | ||
0c2bef46 | 1423 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
85a9994a | 1424 | |
d43c6b6e | 1425 | /* If sched scan was aborted by the driver. */ |
6ea0a69c | 1426 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1427 | |
85a9994a LC |
1428 | mutex_unlock(&local->mtx); |
1429 | ||
b34939b9 | 1430 | cfg80211_sched_scan_stopped(local->hw.wiphy, 0); |
85a9994a LC |
1431 | } |
1432 | ||
f6837ba8 JB |
1433 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1434 | { | |
1435 | struct ieee80211_local *local = | |
1436 | container_of(work, struct ieee80211_local, | |
1437 | sched_scan_stopped_work); | |
1438 | ||
1439 | ieee80211_sched_scan_end(local); | |
1440 | } | |
1441 | ||
79f460ca LC |
1442 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1443 | { | |
1444 | struct ieee80211_local *local = hw_to_local(hw); | |
1445 | ||
1446 | trace_api_sched_scan_stopped(local); | |
1447 | ||
2bc533bd EP |
1448 | /* |
1449 | * this shouldn't really happen, so for simplicity | |
1450 | * simply ignore it, and let mac80211 reconfigure | |
1451 | * the sched scan later on. | |
1452 | */ | |
1453 | if (local->in_reconfig) | |
1454 | return; | |
1455 | ||
18db594a | 1456 | schedule_work(&local->sched_scan_stopped_work); |
79f460ca LC |
1457 | } |
1458 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |