1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Scanning implementation |
4 | * |
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> |
10 | * Copyright 2013-2015 Intel Mobile Communications GmbH |
11 | * Copyright 2016-2017 Intel Deutschland GmbH |
12 | * Copyright (C) 2018-2024 Intel Corporation |
13 | */ |
14 | |
15 | #include <linux/if_arp.h> |
16 | #include <linux/etherdevice.h> |
17 | #include <linux/rtnetlink.h> |
18 | #include <net/sch_generic.h> |
19 | #include <linux/slab.h> |
20 | #include <linux/export.h> |
21 | #include <linux/random.h> |
22 | #include <net/mac80211.h> |
23 | |
24 | #include "ieee80211_i.h" |
25 | #include "driver-ops.h" |
26 | #include "mesh.h" |
27 | |
28 | #define IEEE80211_PROBE_DELAY (HZ / 33) |
29 | #define IEEE80211_CHANNEL_TIME (HZ / 33) |
30 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) |
31 | |
32 | void ieee80211_rx_bss_put(struct ieee80211_local *local, |
33 | struct ieee80211_bss *bss) |
34 | { |
35 | if (!bss) |
36 | return; |
37 | cfg80211_put_bss(wiphy: local->hw.wiphy, |
38 | container_of((void *)bss, struct cfg80211_bss, priv)); |
39 | } |
40 | |
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 | |
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) |
67 | { |
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; |
73 | int clen, srlen; |
74 | |
75 | /* This happens while joining an IBSS */ |
76 | if (!update_data) |
77 | return; |
78 | |
79 | elems = ieee802_11_parse_elems(start: ies->data, len: ies->len, action: false, NULL); |
80 | if (!elems) |
81 | return; |
82 | |
83 | rx_status = update_data->rx_status; |
84 | |
85 | if (update_data->beacon) |
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) { |
91 | if (update_data->beacon) |
92 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; |
93 | else |
94 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; |
95 | } else { |
96 | if (update_data->beacon) |
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 | |
145 | if (update_data->beacon) { |
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 | } |
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; |
159 | |
160 | kfree(objp: elems); |
161 | } |
162 | |
163 | struct ieee80211_bss * |
164 | ieee80211_bss_info_update(struct ieee80211_local *local, |
165 | struct ieee80211_rx_status *rx_status, |
166 | struct ieee80211_mgmt *mgmt, size_t len, |
167 | struct ieee80211_channel *channel) |
168 | { |
169 | bool beacon = ieee80211_is_beacon(fc: mgmt->frame_control) || |
170 | ieee80211_is_s1g_beacon(fc: mgmt->frame_control); |
171 | struct cfg80211_bss *cbss; |
172 | struct inform_bss_update_data update_data = { |
173 | .rx_status = rx_status, |
174 | .beacon = beacon, |
175 | }; |
176 | struct cfg80211_inform_bss bss_meta = { |
177 | .boottime_ns = rx_status->boottime_ns, |
178 | .drv_data = (void *)&update_data, |
179 | }; |
180 | bool signal_valid; |
181 | struct ieee80211_sub_if_data *scan_sdata; |
182 | |
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)) |
186 | bss_meta.signal = rx_status->signal * 100; |
187 | else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) |
188 | bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal; |
189 | |
190 | bss_meta.chan = channel; |
191 | |
192 | rcu_read_lock(); |
193 | scan_sdata = rcu_dereference(local->scan_sdata); |
194 | if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION && |
195 | scan_sdata->vif.cfg.assoc && |
196 | ieee80211_have_rx_timestamp(status: rx_status)) { |
197 | struct ieee80211_bss_conf *link_conf = NULL; |
198 | |
199 | /* for an MLO connection, set the TSF data only in case we have |
200 | * an indication on which of the links the frame was received |
201 | */ |
202 | if (ieee80211_vif_is_mld(vif: &scan_sdata->vif)) { |
203 | if (rx_status->link_valid) { |
204 | s8 link_id = rx_status->link_id; |
205 | |
206 | link_conf = |
207 | rcu_dereference(scan_sdata->vif.link_conf[link_id]); |
208 | } |
209 | } else { |
210 | link_conf = &scan_sdata->vif.bss_conf; |
211 | } |
212 | |
213 | if (link_conf) { |
214 | bss_meta.parent_tsf = |
215 | ieee80211_calculate_rx_timestamp(local, |
216 | status: rx_status, |
217 | mpdu_len: len + FCS_LEN, |
218 | mpdu_offset: 24); |
219 | |
220 | ether_addr_copy(dst: bss_meta.parent_bssid, |
221 | src: link_conf->bssid); |
222 | } |
223 | } |
224 | rcu_read_unlock(); |
225 | |
226 | cbss = cfg80211_inform_bss_frame_data(wiphy: local->hw.wiphy, data: &bss_meta, |
227 | mgmt, len, GFP_ATOMIC); |
228 | if (!cbss) |
229 | return NULL; |
230 | |
231 | /* In case the signal is invalid update the status */ |
232 | signal_valid = channel == cbss->channel; |
233 | if (!signal_valid) |
234 | rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; |
235 | |
236 | return (void *)cbss->priv; |
237 | } |
238 | |
239 | static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata, |
240 | struct ieee80211_channel *channel, |
241 | u32 scan_flags, const u8 *da) |
242 | { |
243 | if (!sdata) |
244 | return false; |
245 | |
246 | /* accept broadcast on 6 GHz and for OCE */ |
247 | if (is_broadcast_ether_addr(addr: da) && |
248 | (channel->band == NL80211_BAND_6GHZ || |
249 | scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP)) |
250 | return true; |
251 | |
252 | if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
253 | return true; |
254 | return ether_addr_equal(addr1: da, addr2: sdata->vif.addr); |
255 | } |
256 | |
257 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
258 | { |
259 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
260 | struct ieee80211_mgmt *mgmt = (void *)skb->data; |
261 | struct ieee80211_bss *bss; |
262 | struct ieee80211_channel *channel; |
263 | size_t min_hdr_len = offsetof(struct ieee80211_mgmt, |
264 | u.probe_resp.variable); |
265 | |
266 | if (!ieee80211_is_probe_resp(fc: mgmt->frame_control) && |
267 | !ieee80211_is_beacon(fc: mgmt->frame_control) && |
268 | !ieee80211_is_s1g_beacon(fc: mgmt->frame_control)) |
269 | return; |
270 | |
271 | if (ieee80211_is_s1g_beacon(fc: mgmt->frame_control)) { |
272 | if (ieee80211_is_s1g_short_beacon(fc: mgmt->frame_control)) |
273 | min_hdr_len = offsetof(struct ieee80211_ext, |
274 | u.s1g_short_beacon.variable); |
275 | else |
276 | min_hdr_len = offsetof(struct ieee80211_ext, |
277 | u.s1g_beacon); |
278 | } |
279 | |
280 | if (skb->len < min_hdr_len) |
281 | return; |
282 | |
283 | if (test_and_clear_bit(nr: SCAN_BEACON_WAIT, addr: &local->scanning)) { |
284 | /* |
285 | * we were passive scanning because of radar/no-IR, but |
286 | * the beacon/proberesp rx gives us an opportunity to upgrade |
287 | * to active scan |
288 | */ |
289 | set_bit(nr: SCAN_BEACON_DONE, addr: &local->scanning); |
290 | wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, delay: 0); |
291 | } |
292 | |
293 | channel = ieee80211_get_channel_khz(wiphy: local->hw.wiphy, |
294 | freq: ieee80211_rx_status_to_khz(rx_status)); |
295 | |
296 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) |
297 | return; |
298 | |
299 | if (ieee80211_is_probe_resp(fc: mgmt->frame_control)) { |
300 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
301 | struct cfg80211_scan_request *scan_req; |
302 | struct cfg80211_sched_scan_request *sched_scan_req; |
303 | u32 scan_req_flags = 0, sched_scan_req_flags = 0; |
304 | |
305 | sdata1 = rcu_dereference(local->scan_sdata); |
306 | sdata2 = rcu_dereference(local->sched_scan_sdata); |
307 | |
308 | if (likely(!sdata1 && !sdata2)) |
309 | return; |
310 | |
311 | scan_req = rcu_dereference(local->scan_req); |
312 | sched_scan_req = rcu_dereference(local->sched_scan_req); |
313 | |
314 | if (scan_req) |
315 | scan_req_flags = scan_req->flags; |
316 | |
317 | if (sched_scan_req) |
318 | sched_scan_req_flags = sched_scan_req->flags; |
319 | |
320 | /* ignore ProbeResp to foreign address or non-bcast (OCE) |
321 | * unless scanning with randomised address |
322 | */ |
323 | if (!ieee80211_scan_accept_presp(sdata: sdata1, channel, |
324 | scan_flags: scan_req_flags, |
325 | da: mgmt->da) && |
326 | !ieee80211_scan_accept_presp(sdata: sdata2, channel, |
327 | scan_flags: sched_scan_req_flags, |
328 | da: mgmt->da)) |
329 | return; |
330 | } else { |
331 | /* Beacons are expected only with broadcast address */ |
332 | if (!is_broadcast_ether_addr(addr: mgmt->da)) |
333 | return; |
334 | } |
335 | |
336 | /* Do not update the BSS table in case of only monitor interfaces */ |
337 | if (local->open_count == local->monitors) |
338 | return; |
339 | |
340 | bss = ieee80211_bss_info_update(local, rx_status, |
341 | mgmt, len: skb->len, |
342 | channel); |
343 | if (bss) |
344 | ieee80211_rx_bss_put(local, bss); |
345 | } |
346 | |
347 | static void ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef) |
348 | { |
349 | memset(chandef, 0, sizeof(*chandef)); |
350 | |
351 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; |
352 | } |
353 | |
354 | /* return false if no more work */ |
355 | static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata) |
356 | { |
357 | struct ieee80211_local *local = sdata->local; |
358 | struct cfg80211_scan_request *req; |
359 | struct cfg80211_chan_def chandef; |
360 | u8 bands_used = 0; |
361 | int i, ielen, n_chans; |
362 | u32 flags = 0; |
363 | |
364 | req = rcu_dereference_protected(local->scan_req, |
365 | lockdep_is_held(&local->hw.wiphy->mtx)); |
366 | |
367 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
368 | return false; |
369 | |
370 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
371 | for (i = 0; i < req->n_channels; i++) { |
372 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
373 | bands_used |= BIT(req->channels[i]->band); |
374 | } |
375 | |
376 | n_chans = req->n_channels; |
377 | } else { |
378 | do { |
379 | if (local->hw_scan_band == NUM_NL80211_BANDS) |
380 | return false; |
381 | |
382 | n_chans = 0; |
383 | |
384 | for (i = 0; i < req->n_channels; i++) { |
385 | if (req->channels[i]->band != |
386 | local->hw_scan_band) |
387 | continue; |
388 | local->hw_scan_req->req.channels[n_chans] = |
389 | req->channels[i]; |
390 | n_chans++; |
391 | bands_used |= BIT(req->channels[i]->band); |
392 | } |
393 | |
394 | local->hw_scan_band++; |
395 | } while (!n_chans); |
396 | } |
397 | |
398 | local->hw_scan_req->req.n_channels = n_chans; |
399 | ieee80211_prepare_scan_chandef(chandef: &chandef); |
400 | |
401 | if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
402 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; |
403 | |
404 | ielen = ieee80211_build_preq_ies(sdata, |
405 | buffer: (u8 *)local->hw_scan_req->req.ie, |
406 | buffer_len: local->hw_scan_ies_bufsize, |
407 | ie_desc: &local->hw_scan_req->ies, |
408 | ie: req->ie, ie_len: req->ie_len, |
409 | bands_used, rate_masks: req->rates, chandef: &chandef, |
410 | flags); |
411 | if (ielen < 0) |
412 | return false; |
413 | local->hw_scan_req->req.ie_len = ielen; |
414 | local->hw_scan_req->req.no_cck = req->no_cck; |
415 | ether_addr_copy(dst: local->hw_scan_req->req.mac_addr, src: req->mac_addr); |
416 | ether_addr_copy(dst: local->hw_scan_req->req.mac_addr_mask, |
417 | src: req->mac_addr_mask); |
418 | ether_addr_copy(dst: local->hw_scan_req->req.bssid, src: req->bssid); |
419 | |
420 | return true; |
421 | } |
422 | |
423 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
424 | { |
425 | struct ieee80211_local *local = hw_to_local(hw); |
426 | bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
427 | bool was_scanning = local->scanning; |
428 | struct cfg80211_scan_request *scan_req; |
429 | struct ieee80211_sub_if_data *scan_sdata; |
430 | struct ieee80211_sub_if_data *sdata; |
431 | |
432 | lockdep_assert_wiphy(local->hw.wiphy); |
433 | |
434 | /* |
435 | * It's ok to abort a not-yet-running scan (that |
436 | * we have one at all will be verified by checking |
437 | * local->scan_req next), but not to complete it |
438 | * successfully. |
439 | */ |
440 | if (WARN_ON(!local->scanning && !aborted)) |
441 | aborted = true; |
442 | |
443 | if (WARN_ON(!local->scan_req)) |
444 | return; |
445 | |
446 | scan_sdata = rcu_dereference_protected(local->scan_sdata, |
447 | lockdep_is_held(&local->hw.wiphy->mtx)); |
448 | |
449 | if (hw_scan && !aborted && |
450 | !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && |
451 | ieee80211_prep_hw_scan(sdata: scan_sdata)) { |
452 | int rc; |
453 | |
454 | rc = drv_hw_scan(local, |
455 | rcu_dereference_protected(local->scan_sdata, |
456 | lockdep_is_held(&local->hw.wiphy->mtx)), |
457 | req: local->hw_scan_req); |
458 | |
459 | if (rc == 0) |
460 | return; |
461 | |
462 | /* HW scan failed and is going to be reported as aborted, |
463 | * so clear old scan info. |
464 | */ |
465 | memset(&local->scan_info, 0, sizeof(local->scan_info)); |
466 | aborted = true; |
467 | } |
468 | |
469 | kfree(objp: local->hw_scan_req); |
470 | local->hw_scan_req = NULL; |
471 | |
472 | scan_req = rcu_dereference_protected(local->scan_req, |
473 | lockdep_is_held(&local->hw.wiphy->mtx)); |
474 | |
475 | RCU_INIT_POINTER(local->scan_req, NULL); |
476 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
477 | |
478 | local->scanning = 0; |
479 | local->scan_chandef.chan = NULL; |
480 | |
481 | synchronize_rcu(); |
482 | |
483 | if (scan_req != local->int_scan_req) { |
484 | local->scan_info.aborted = aborted; |
485 | cfg80211_scan_done(request: scan_req, info: &local->scan_info); |
486 | } |
487 | |
488 | /* Set power back to normal operating levels. */ |
489 | ieee80211_hw_conf_chan(local); |
490 | |
491 | if (!hw_scan && was_scanning) { |
492 | ieee80211_configure_filter(local); |
493 | drv_sw_scan_complete(local, sdata: scan_sdata); |
494 | ieee80211_offchannel_return(local); |
495 | } |
496 | |
497 | ieee80211_recalc_idle(local); |
498 | |
499 | ieee80211_mlme_notify_scan_completed(local); |
500 | ieee80211_ibss_notify_scan_completed(local); |
501 | |
502 | /* Requeue all the work that might have been ignored while |
503 | * the scan was in progress; if there was none this will |
504 | * just be a no-op for the particular interface. |
505 | */ |
506 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
507 | if (ieee80211_sdata_running(sdata)) |
508 | wiphy_work_queue(wiphy: sdata->local->hw.wiphy, work: &sdata->work); |
509 | } |
510 | |
511 | if (was_scanning) |
512 | ieee80211_start_next_roc(local); |
513 | } |
514 | |
515 | void ieee80211_scan_completed(struct ieee80211_hw *hw, |
516 | struct cfg80211_scan_info *info) |
517 | { |
518 | struct ieee80211_local *local = hw_to_local(hw); |
519 | |
520 | trace_api_scan_completed(local, aborted: info->aborted); |
521 | |
522 | set_bit(nr: SCAN_COMPLETED, addr: &local->scanning); |
523 | if (info->aborted) |
524 | set_bit(nr: SCAN_ABORTED, addr: &local->scanning); |
525 | |
526 | memcpy(&local->scan_info, info, sizeof(*info)); |
527 | |
528 | wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, delay: 0); |
529 | } |
530 | EXPORT_SYMBOL(ieee80211_scan_completed); |
531 | |
532 | static int ieee80211_start_sw_scan(struct ieee80211_local *local, |
533 | struct ieee80211_sub_if_data *sdata) |
534 | { |
535 | /* Software scan is not supported in multi-channel cases */ |
536 | if (!local->emulate_chanctx) |
537 | return -EOPNOTSUPP; |
538 | |
539 | /* |
540 | * Hardware/driver doesn't support hw_scan, so use software |
541 | * scanning instead. First send a nullfunc frame with power save |
542 | * bit on so that AP will buffer the frames for us while we are not |
543 | * listening, then send probe requests to each channel and wait for |
544 | * the responses. After all channels are scanned, tune back to the |
545 | * original channel and send a nullfunc frame with power save bit |
546 | * off to trigger the AP to send us all the buffered frames. |
547 | * |
548 | * Note that while local->sw_scanning is true everything else but |
549 | * nullfunc frames and probe requests will be dropped in |
550 | * ieee80211_tx_h_check_assoc(). |
551 | */ |
552 | drv_sw_scan_start(local, sdata, mac_addr: local->scan_addr); |
553 | |
554 | local->leave_oper_channel_time = jiffies; |
555 | local->next_scan_state = SCAN_DECISION; |
556 | local->scan_channel_idx = 0; |
557 | |
558 | ieee80211_offchannel_stop_vifs(local); |
559 | |
560 | /* ensure nullfunc is transmitted before leaving operating channel */ |
561 | ieee80211_flush_queues(local, NULL, drop: false); |
562 | |
563 | ieee80211_configure_filter(local); |
564 | |
565 | /* We need to set power level at maximum rate for scanning. */ |
566 | ieee80211_hw_conf_chan(local); |
567 | |
568 | wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, delay: 0); |
569 | |
570 | return 0; |
571 | } |
572 | |
573 | static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata) |
574 | { |
575 | struct ieee80211_local *local = sdata->local; |
576 | struct ieee80211_sub_if_data *sdata_iter; |
577 | |
578 | lockdep_assert_wiphy(local->hw.wiphy); |
579 | |
580 | if (!ieee80211_is_radar_required(local)) |
581 | return true; |
582 | |
583 | if (!regulatory_pre_cac_allowed(wiphy: local->hw.wiphy)) |
584 | return false; |
585 | |
586 | list_for_each_entry(sdata_iter, &local->interfaces, list) { |
587 | if (sdata_iter->wdev.cac_started) |
588 | return false; |
589 | } |
590 | |
591 | return true; |
592 | } |
593 | |
594 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
595 | struct ieee80211_sub_if_data *sdata) |
596 | { |
597 | if (!__ieee80211_can_leave_ch(sdata)) |
598 | return false; |
599 | |
600 | if (!list_empty(head: &local->roc_list)) |
601 | return false; |
602 | |
603 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
604 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
605 | return false; |
606 | |
607 | return true; |
608 | } |
609 | |
610 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) |
611 | { |
612 | lockdep_assert_wiphy(local->hw.wiphy); |
613 | |
614 | if (!local->scan_req || local->scanning) |
615 | return; |
616 | |
617 | if (!ieee80211_can_scan(local, |
618 | rcu_dereference_protected( |
619 | local->scan_sdata, |
620 | lockdep_is_held(&local->hw.wiphy->mtx)))) |
621 | return; |
622 | |
623 | wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, |
624 | delay: round_jiffies_relative(j: 0)); |
625 | } |
626 | |
627 | static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, |
628 | const u8 *src, const u8 *dst, |
629 | const u8 *ssid, size_t ssid_len, |
630 | const u8 *ie, size_t ie_len, |
631 | u32 ratemask, u32 flags, u32 tx_flags, |
632 | struct ieee80211_channel *channel) |
633 | { |
634 | struct sk_buff *skb; |
635 | |
636 | skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, chan: channel, |
637 | ssid, ssid_len, |
638 | ie, ie_len, flags); |
639 | |
640 | if (skb) { |
641 | if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { |
642 | struct ieee80211_hdr *hdr = (void *)skb->data; |
643 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
644 | u16 sn = get_random_u16(); |
645 | |
646 | info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; |
647 | hdr->seq_ctrl = |
648 | cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); |
649 | } |
650 | IEEE80211_SKB_CB(skb)->flags |= tx_flags; |
651 | ieee80211_tx_skb_tid_band(sdata, skb, tid: 7, band: channel->band); |
652 | } |
653 | } |
654 | |
655 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
656 | unsigned long *next_delay) |
657 | { |
658 | int i; |
659 | struct ieee80211_sub_if_data *sdata; |
660 | struct cfg80211_scan_request *scan_req; |
661 | enum nl80211_band band = local->hw.conf.chandef.chan->band; |
662 | u32 flags = 0, tx_flags; |
663 | |
664 | scan_req = rcu_dereference_protected(local->scan_req, |
665 | lockdep_is_held(&local->hw.wiphy->mtx)); |
666 | |
667 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
668 | if (scan_req->no_cck) |
669 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
670 | if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
671 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; |
672 | if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) |
673 | flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; |
674 | |
675 | sdata = rcu_dereference_protected(local->scan_sdata, |
676 | lockdep_is_held(&local->hw.wiphy->mtx)); |
677 | |
678 | for (i = 0; i < scan_req->n_ssids; i++) |
679 | ieee80211_send_scan_probe_req( |
680 | sdata, src: local->scan_addr, dst: scan_req->bssid, |
681 | ssid: scan_req->ssids[i].ssid, ssid_len: scan_req->ssids[i].ssid_len, |
682 | ie: scan_req->ie, ie_len: scan_req->ie_len, |
683 | ratemask: scan_req->rates[band], flags, |
684 | tx_flags, channel: local->hw.conf.chandef.chan); |
685 | |
686 | /* |
687 | * After sending probe requests, wait for probe responses |
688 | * on the channel. |
689 | */ |
690 | *next_delay = msecs_to_jiffies(m: scan_req->duration) > |
691 | IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME ? |
692 | msecs_to_jiffies(m: scan_req->duration) - IEEE80211_PROBE_DELAY : |
693 | IEEE80211_CHANNEL_TIME; |
694 | local->next_scan_state = SCAN_DECISION; |
695 | } |
696 | |
697 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
698 | struct cfg80211_scan_request *req) |
699 | { |
700 | struct ieee80211_local *local = sdata->local; |
701 | bool hw_scan = local->ops->hw_scan; |
702 | int rc; |
703 | |
704 | lockdep_assert_wiphy(local->hw.wiphy); |
705 | |
706 | if (local->scan_req) |
707 | return -EBUSY; |
708 | |
709 | /* For an MLO connection, if a link ID was specified, validate that it |
710 | * is indeed active. If no link ID was specified, select one of the |
711 | * active links. |
712 | */ |
713 | if (ieee80211_vif_is_mld(vif: &sdata->vif)) { |
714 | if (req->tsf_report_link_id >= 0) { |
715 | if (!(sdata->vif.active_links & |
716 | BIT(req->tsf_report_link_id))) |
717 | return -EINVAL; |
718 | } else { |
719 | req->tsf_report_link_id = |
720 | __ffs(sdata->vif.active_links); |
721 | } |
722 | } |
723 | |
724 | if (!__ieee80211_can_leave_ch(sdata)) |
725 | return -EBUSY; |
726 | |
727 | if (!ieee80211_can_scan(local, sdata)) { |
728 | /* wait for the work to finish/time out */ |
729 | rcu_assign_pointer(local->scan_req, req); |
730 | rcu_assign_pointer(local->scan_sdata, sdata); |
731 | return 0; |
732 | } |
733 | |
734 | again: |
735 | if (hw_scan) { |
736 | u8 *ies; |
737 | |
738 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
739 | |
740 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
741 | int i, n_bands = 0; |
742 | u8 bands_counted = 0; |
743 | |
744 | for (i = 0; i < req->n_channels; i++) { |
745 | if (bands_counted & BIT(req->channels[i]->band)) |
746 | continue; |
747 | bands_counted |= BIT(req->channels[i]->band); |
748 | n_bands++; |
749 | } |
750 | |
751 | local->hw_scan_ies_bufsize *= n_bands; |
752 | } |
753 | |
754 | local->hw_scan_req = kmalloc( |
755 | size: sizeof(*local->hw_scan_req) + |
756 | req->n_channels * sizeof(req->channels[0]) + |
757 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
758 | if (!local->hw_scan_req) |
759 | return -ENOMEM; |
760 | |
761 | local->hw_scan_req->req.ssids = req->ssids; |
762 | local->hw_scan_req->req.n_ssids = req->n_ssids; |
763 | ies = (u8 *)local->hw_scan_req + |
764 | sizeof(*local->hw_scan_req) + |
765 | req->n_channels * sizeof(req->channels[0]); |
766 | local->hw_scan_req->req.ie = ies; |
767 | local->hw_scan_req->req.flags = req->flags; |
768 | eth_broadcast_addr(addr: local->hw_scan_req->req.bssid); |
769 | local->hw_scan_req->req.duration = req->duration; |
770 | local->hw_scan_req->req.duration_mandatory = |
771 | req->duration_mandatory; |
772 | local->hw_scan_req->req.tsf_report_link_id = |
773 | req->tsf_report_link_id; |
774 | |
775 | local->hw_scan_band = 0; |
776 | local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params; |
777 | local->hw_scan_req->req.scan_6ghz_params = |
778 | req->scan_6ghz_params; |
779 | local->hw_scan_req->req.scan_6ghz = req->scan_6ghz; |
780 | |
781 | /* |
782 | * After allocating local->hw_scan_req, we must |
783 | * go through until ieee80211_prep_hw_scan(), so |
784 | * anything that might be changed here and leave |
785 | * this function early must not go after this |
786 | * allocation. |
787 | */ |
788 | } |
789 | |
790 | rcu_assign_pointer(local->scan_req, req); |
791 | rcu_assign_pointer(local->scan_sdata, sdata); |
792 | |
793 | if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
794 | get_random_mask_addr(buf: local->scan_addr, |
795 | addr: req->mac_addr, |
796 | mask: req->mac_addr_mask); |
797 | else |
798 | memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); |
799 | |
800 | if (hw_scan) { |
801 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
802 | } else if ((req->n_channels == 1) && |
803 | (req->channels[0] == local->hw.conf.chandef.chan)) { |
804 | /* |
805 | * If we are scanning only on the operating channel |
806 | * then we do not need to stop normal activities |
807 | */ |
808 | unsigned long next_delay; |
809 | |
810 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); |
811 | |
812 | ieee80211_recalc_idle(local); |
813 | |
814 | /* Notify driver scan is starting, keep order of operations |
815 | * same as normal software scan, in case that matters. */ |
816 | drv_sw_scan_start(local, sdata, mac_addr: local->scan_addr); |
817 | |
818 | ieee80211_configure_filter(local); /* accept probe-responses */ |
819 | |
820 | /* We need to ensure power level is at max for scanning. */ |
821 | ieee80211_hw_conf_chan(local); |
822 | |
823 | if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | |
824 | IEEE80211_CHAN_RADAR)) || |
825 | !req->n_ssids) { |
826 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
827 | if (req->n_ssids) |
828 | set_bit(nr: SCAN_BEACON_WAIT, addr: &local->scanning); |
829 | } else { |
830 | ieee80211_scan_state_send_probe(local, next_delay: &next_delay); |
831 | next_delay = IEEE80211_CHANNEL_TIME; |
832 | } |
833 | |
834 | /* Now, just wait a bit and we are all done! */ |
835 | wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, |
836 | delay: next_delay); |
837 | return 0; |
838 | } else { |
839 | /* Do normal software scan */ |
840 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
841 | } |
842 | |
843 | ieee80211_recalc_idle(local); |
844 | |
845 | if (hw_scan) { |
846 | WARN_ON(!ieee80211_prep_hw_scan(sdata)); |
847 | rc = drv_hw_scan(local, sdata, req: local->hw_scan_req); |
848 | } else { |
849 | rc = ieee80211_start_sw_scan(local, sdata); |
850 | } |
851 | |
852 | if (rc) { |
853 | kfree(objp: local->hw_scan_req); |
854 | local->hw_scan_req = NULL; |
855 | local->scanning = 0; |
856 | |
857 | ieee80211_recalc_idle(local); |
858 | |
859 | local->scan_req = NULL; |
860 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
861 | } |
862 | |
863 | if (hw_scan && rc == 1) { |
864 | /* |
865 | * we can't fall back to software for P2P-GO |
866 | * as it must update NoA etc. |
867 | */ |
868 | if (ieee80211_vif_type_p2p(vif: &sdata->vif) == |
869 | NL80211_IFTYPE_P2P_GO) |
870 | return -EOPNOTSUPP; |
871 | hw_scan = false; |
872 | goto again; |
873 | } |
874 | |
875 | return rc; |
876 | } |
877 | |
878 | static unsigned long |
879 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) |
880 | { |
881 | /* |
882 | * TODO: channel switching also consumes quite some time, |
883 | * add that delay as well to get a better estimation |
884 | */ |
885 | if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) |
886 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
887 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; |
888 | } |
889 | |
890 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
891 | unsigned long *next_delay) |
892 | { |
893 | bool associated = false; |
894 | bool tx_empty = true; |
895 | bool bad_latency; |
896 | struct ieee80211_sub_if_data *sdata; |
897 | struct ieee80211_channel *next_chan; |
898 | enum mac80211_scan_state next_scan_state; |
899 | struct cfg80211_scan_request *scan_req; |
900 | |
901 | lockdep_assert_wiphy(local->hw.wiphy); |
902 | |
903 | /* |
904 | * check if at least one STA interface is associated, |
905 | * check if at least one STA interface has pending tx frames |
906 | * and grab the lowest used beacon interval |
907 | */ |
908 | list_for_each_entry(sdata, &local->interfaces, list) { |
909 | if (!ieee80211_sdata_running(sdata)) |
910 | continue; |
911 | |
912 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
913 | if (sdata->u.mgd.associated) { |
914 | associated = true; |
915 | |
916 | if (!qdisc_all_tx_empty(dev: sdata->dev)) { |
917 | tx_empty = false; |
918 | break; |
919 | } |
920 | } |
921 | } |
922 | } |
923 | |
924 | scan_req = rcu_dereference_protected(local->scan_req, |
925 | lockdep_is_held(&local->hw.wiphy->mtx)); |
926 | |
927 | next_chan = scan_req->channels[local->scan_channel_idx]; |
928 | |
929 | /* |
930 | * we're currently scanning a different channel, let's |
931 | * see if we can scan another channel without interfering |
932 | * with the current traffic situation. |
933 | * |
934 | * Keep good latency, do not stay off-channel more than 125 ms. |
935 | */ |
936 | |
937 | bad_latency = time_after(jiffies + |
938 | ieee80211_scan_get_channel_time(next_chan), |
939 | local->leave_oper_channel_time + HZ / 8); |
940 | |
941 | if (associated && !tx_empty) { |
942 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
943 | next_scan_state = SCAN_ABORT; |
944 | else |
945 | next_scan_state = SCAN_SUSPEND; |
946 | } else if (associated && bad_latency) { |
947 | next_scan_state = SCAN_SUSPEND; |
948 | } else { |
949 | next_scan_state = SCAN_SET_CHANNEL; |
950 | } |
951 | |
952 | local->next_scan_state = next_scan_state; |
953 | |
954 | *next_delay = 0; |
955 | } |
956 | |
957 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
958 | unsigned long *next_delay) |
959 | { |
960 | int skip; |
961 | struct ieee80211_channel *chan; |
962 | struct cfg80211_scan_request *scan_req; |
963 | |
964 | scan_req = rcu_dereference_protected(local->scan_req, |
965 | lockdep_is_held(&local->hw.wiphy->mtx)); |
966 | |
967 | skip = 0; |
968 | chan = scan_req->channels[local->scan_channel_idx]; |
969 | |
970 | local->scan_chandef.chan = chan; |
971 | local->scan_chandef.center_freq1 = chan->center_freq; |
972 | local->scan_chandef.freq1_offset = chan->freq_offset; |
973 | local->scan_chandef.center_freq2 = 0; |
974 | |
975 | /* For scanning on the S1G band, detect the channel width according to |
976 | * the channel being scanned. |
977 | */ |
978 | if (chan->band == NL80211_BAND_S1GHZ) { |
979 | local->scan_chandef.width = ieee80211_s1g_channel_width(chan); |
980 | goto set_channel; |
981 | } |
982 | |
983 | /* If scanning on oper channel, use whatever channel-type |
984 | * is currently in use. |
985 | */ |
986 | if (chan == local->hw.conf.chandef.chan) |
987 | local->scan_chandef = local->hw.conf.chandef; |
988 | else |
989 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; |
990 | |
991 | set_channel: |
992 | if (ieee80211_hw_conf_chan(local)) |
993 | skip = 1; |
994 | |
995 | /* advance state machine to next channel/band */ |
996 | local->scan_channel_idx++; |
997 | |
998 | if (skip) { |
999 | /* if we skip this channel return to the decision state */ |
1000 | local->next_scan_state = SCAN_DECISION; |
1001 | return; |
1002 | } |
1003 | |
1004 | /* |
1005 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 |
1006 | * (which unfortunately doesn't say _why_ step a) is done, |
1007 | * but it waits for the probe delay or until a frame is |
1008 | * received - and the received frame would update the NAV). |
1009 | * For now, we do not support waiting until a frame is |
1010 | * received. |
1011 | * |
1012 | * In any case, it is not necessary for a passive scan. |
1013 | */ |
1014 | if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || |
1015 | !scan_req->n_ssids) { |
1016 | *next_delay = msecs_to_jiffies(m: scan_req->duration) > |
1017 | IEEE80211_PASSIVE_CHANNEL_TIME ? |
1018 | msecs_to_jiffies(m: scan_req->duration) : |
1019 | IEEE80211_PASSIVE_CHANNEL_TIME; |
1020 | local->next_scan_state = SCAN_DECISION; |
1021 | if (scan_req->n_ssids) |
1022 | set_bit(nr: SCAN_BEACON_WAIT, addr: &local->scanning); |
1023 | return; |
1024 | } |
1025 | |
1026 | /* active scan, send probes */ |
1027 | *next_delay = IEEE80211_PROBE_DELAY; |
1028 | local->next_scan_state = SCAN_SEND_PROBE; |
1029 | } |
1030 | |
1031 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
1032 | unsigned long *next_delay) |
1033 | { |
1034 | /* switch back to the operating channel */ |
1035 | local->scan_chandef.chan = NULL; |
1036 | ieee80211_hw_conf_chan(local); |
1037 | |
1038 | /* disable PS */ |
1039 | ieee80211_offchannel_return(local); |
1040 | |
1041 | *next_delay = HZ / 5; |
1042 | /* afterwards, resume scan & go to next channel */ |
1043 | local->next_scan_state = SCAN_RESUME; |
1044 | } |
1045 | |
1046 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, |
1047 | unsigned long *next_delay) |
1048 | { |
1049 | ieee80211_offchannel_stop_vifs(local); |
1050 | |
1051 | if (local->ops->flush) { |
1052 | ieee80211_flush_queues(local, NULL, drop: false); |
1053 | *next_delay = 0; |
1054 | } else |
1055 | *next_delay = HZ / 10; |
1056 | |
1057 | /* remember when we left the operating channel */ |
1058 | local->leave_oper_channel_time = jiffies; |
1059 | |
1060 | /* advance to the next channel to be scanned */ |
1061 | local->next_scan_state = SCAN_SET_CHANNEL; |
1062 | } |
1063 | |
1064 | void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work) |
1065 | { |
1066 | struct ieee80211_local *local = |
1067 | container_of(work, struct ieee80211_local, scan_work.work); |
1068 | struct ieee80211_sub_if_data *sdata; |
1069 | struct cfg80211_scan_request *scan_req; |
1070 | unsigned long next_delay = 0; |
1071 | bool aborted; |
1072 | |
1073 | lockdep_assert_wiphy(local->hw.wiphy); |
1074 | |
1075 | if (!ieee80211_can_run_worker(local)) { |
1076 | aborted = true; |
1077 | goto out_complete; |
1078 | } |
1079 | |
1080 | sdata = rcu_dereference_protected(local->scan_sdata, |
1081 | lockdep_is_held(&local->hw.wiphy->mtx)); |
1082 | scan_req = rcu_dereference_protected(local->scan_req, |
1083 | lockdep_is_held(&local->hw.wiphy->mtx)); |
1084 | |
1085 | /* When scanning on-channel, the first-callback means completed. */ |
1086 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { |
1087 | aborted = test_and_clear_bit(nr: SCAN_ABORTED, addr: &local->scanning); |
1088 | goto out_complete; |
1089 | } |
1090 | |
1091 | if (test_and_clear_bit(nr: SCAN_COMPLETED, addr: &local->scanning)) { |
1092 | aborted = test_and_clear_bit(nr: SCAN_ABORTED, addr: &local->scanning); |
1093 | goto out_complete; |
1094 | } |
1095 | |
1096 | if (!sdata || !scan_req) |
1097 | return; |
1098 | |
1099 | if (!local->scanning) { |
1100 | int rc; |
1101 | |
1102 | RCU_INIT_POINTER(local->scan_req, NULL); |
1103 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
1104 | |
1105 | rc = __ieee80211_start_scan(sdata, req: scan_req); |
1106 | if (!rc) |
1107 | return; |
1108 | /* need to complete scan in cfg80211 */ |
1109 | rcu_assign_pointer(local->scan_req, scan_req); |
1110 | aborted = true; |
1111 | goto out_complete; |
1112 | } |
1113 | |
1114 | clear_bit(nr: SCAN_BEACON_WAIT, addr: &local->scanning); |
1115 | |
1116 | /* |
1117 | * as long as no delay is required advance immediately |
1118 | * without scheduling a new work |
1119 | */ |
1120 | do { |
1121 | if (!ieee80211_sdata_running(sdata)) { |
1122 | aborted = true; |
1123 | goto out_complete; |
1124 | } |
1125 | |
1126 | if (test_and_clear_bit(nr: SCAN_BEACON_DONE, addr: &local->scanning) && |
1127 | local->next_scan_state == SCAN_DECISION) |
1128 | local->next_scan_state = SCAN_SEND_PROBE; |
1129 | |
1130 | switch (local->next_scan_state) { |
1131 | case SCAN_DECISION: |
1132 | /* if no more bands/channels left, complete scan */ |
1133 | if (local->scan_channel_idx >= scan_req->n_channels) { |
1134 | aborted = false; |
1135 | goto out_complete; |
1136 | } |
1137 | ieee80211_scan_state_decision(local, next_delay: &next_delay); |
1138 | break; |
1139 | case SCAN_SET_CHANNEL: |
1140 | ieee80211_scan_state_set_channel(local, next_delay: &next_delay); |
1141 | break; |
1142 | case SCAN_SEND_PROBE: |
1143 | ieee80211_scan_state_send_probe(local, next_delay: &next_delay); |
1144 | break; |
1145 | case SCAN_SUSPEND: |
1146 | ieee80211_scan_state_suspend(local, next_delay: &next_delay); |
1147 | break; |
1148 | case SCAN_RESUME: |
1149 | ieee80211_scan_state_resume(local, next_delay: &next_delay); |
1150 | break; |
1151 | case SCAN_ABORT: |
1152 | aborted = true; |
1153 | goto out_complete; |
1154 | } |
1155 | } while (next_delay == 0); |
1156 | |
1157 | wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, |
1158 | delay: next_delay); |
1159 | return; |
1160 | |
1161 | out_complete: |
1162 | __ieee80211_scan_completed(hw: &local->hw, aborted); |
1163 | } |
1164 | |
1165 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
1166 | struct cfg80211_scan_request *req) |
1167 | { |
1168 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
1169 | |
1170 | return __ieee80211_start_scan(sdata, req); |
1171 | } |
1172 | |
1173 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
1174 | const u8 *ssid, u8 ssid_len, |
1175 | struct ieee80211_channel **channels, |
1176 | unsigned int n_channels) |
1177 | { |
1178 | struct ieee80211_local *local = sdata->local; |
1179 | int ret = -EBUSY, i, n_ch = 0; |
1180 | enum nl80211_band band; |
1181 | |
1182 | lockdep_assert_wiphy(local->hw.wiphy); |
1183 | |
1184 | /* busy scanning */ |
1185 | if (local->scan_req) |
1186 | goto unlock; |
1187 | |
1188 | /* fill internal scan request */ |
1189 | if (!channels) { |
1190 | int max_n; |
1191 | |
1192 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
1193 | if (!local->hw.wiphy->bands[band] || |
1194 | band == NL80211_BAND_6GHZ) |
1195 | continue; |
1196 | |
1197 | max_n = local->hw.wiphy->bands[band]->n_channels; |
1198 | for (i = 0; i < max_n; i++) { |
1199 | struct ieee80211_channel *tmp_ch = |
1200 | &local->hw.wiphy->bands[band]->channels[i]; |
1201 | |
1202 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
1203 | IEEE80211_CHAN_DISABLED)) |
1204 | continue; |
1205 | |
1206 | local->int_scan_req->channels[n_ch] = tmp_ch; |
1207 | n_ch++; |
1208 | } |
1209 | } |
1210 | |
1211 | if (WARN_ON_ONCE(n_ch == 0)) |
1212 | goto unlock; |
1213 | |
1214 | local->int_scan_req->n_channels = n_ch; |
1215 | } else { |
1216 | for (i = 0; i < n_channels; i++) { |
1217 | if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | |
1218 | IEEE80211_CHAN_DISABLED)) |
1219 | continue; |
1220 | |
1221 | local->int_scan_req->channels[n_ch] = channels[i]; |
1222 | n_ch++; |
1223 | } |
1224 | |
1225 | if (WARN_ON_ONCE(n_ch == 0)) |
1226 | goto unlock; |
1227 | |
1228 | local->int_scan_req->n_channels = n_ch; |
1229 | } |
1230 | |
1231 | local->int_scan_req->ssids = &local->scan_ssid; |
1232 | local->int_scan_req->n_ssids = 1; |
1233 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
1234 | local->int_scan_req->ssids[0].ssid_len = ssid_len; |
1235 | |
1236 | ret = __ieee80211_start_scan(sdata, req: sdata->local->int_scan_req); |
1237 | unlock: |
1238 | return ret; |
1239 | } |
1240 | |
1241 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
1242 | { |
1243 | /* ensure a new scan cannot be queued */ |
1244 | lockdep_assert_wiphy(local->hw.wiphy); |
1245 | |
1246 | /* |
1247 | * We are canceling software scan, or deferred scan that was not |
1248 | * yet really started (see __ieee80211_start_scan ). |
1249 | * |
1250 | * Regarding hardware scan: |
1251 | * - we can not call __ieee80211_scan_completed() as when |
1252 | * SCAN_HW_SCANNING bit is set this function change |
1253 | * local->hw_scan_req to operate on 5G band, what race with |
1254 | * driver which can use local->hw_scan_req |
1255 | * |
1256 | * - we can not cancel scan_work since driver can schedule it |
1257 | * by ieee80211_scan_completed(..., true) to finish scan |
1258 | * |
1259 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
1260 | * driver is still responsible for calling ieee80211_scan_completed() |
1261 | * after the scan was completed/aborted. |
1262 | */ |
1263 | |
1264 | if (!local->scan_req) |
1265 | return; |
1266 | |
1267 | /* |
1268 | * We have a scan running and the driver already reported completion, |
1269 | * but the worker hasn't run yet or is stuck on the mutex - mark it as |
1270 | * cancelled. |
1271 | */ |
1272 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && |
1273 | test_bit(SCAN_COMPLETED, &local->scanning)) { |
1274 | set_bit(nr: SCAN_HW_CANCELLED, addr: &local->scanning); |
1275 | return; |
1276 | } |
1277 | |
1278 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
1279 | /* |
1280 | * Make sure that __ieee80211_scan_completed doesn't trigger a |
1281 | * scan on another band. |
1282 | */ |
1283 | set_bit(nr: SCAN_HW_CANCELLED, addr: &local->scanning); |
1284 | if (local->ops->cancel_hw_scan) |
1285 | drv_cancel_hw_scan(local, |
1286 | rcu_dereference_protected(local->scan_sdata, |
1287 | lockdep_is_held(&local->hw.wiphy->mtx))); |
1288 | return; |
1289 | } |
1290 | |
1291 | wiphy_delayed_work_cancel(wiphy: local->hw.wiphy, dwork: &local->scan_work); |
1292 | /* and clean up */ |
1293 | memset(&local->scan_info, 0, sizeof(local->scan_info)); |
1294 | __ieee80211_scan_completed(hw: &local->hw, aborted: true); |
1295 | } |
1296 | |
1297 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1298 | struct cfg80211_sched_scan_request *req) |
1299 | { |
1300 | struct ieee80211_local *local = sdata->local; |
1301 | struct ieee80211_scan_ies sched_scan_ies = {}; |
1302 | struct cfg80211_chan_def chandef; |
1303 | int ret, i, iebufsz, num_bands = 0; |
1304 | u32 rate_masks[NUM_NL80211_BANDS] = {}; |
1305 | u8 bands_used = 0; |
1306 | u8 *ie; |
1307 | u32 flags = 0; |
1308 | |
1309 | lockdep_assert_wiphy(local->hw.wiphy); |
1310 | |
1311 | iebufsz = local->scan_ies_len + req->ie_len; |
1312 | |
1313 | if (!local->ops->sched_scan_start) |
1314 | return -EOPNOTSUPP; |
1315 | |
1316 | for (i = 0; i < NUM_NL80211_BANDS; i++) { |
1317 | if (local->hw.wiphy->bands[i]) { |
1318 | bands_used |= BIT(i); |
1319 | rate_masks[i] = (u32) -1; |
1320 | num_bands++; |
1321 | } |
1322 | } |
1323 | |
1324 | if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
1325 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; |
1326 | |
1327 | ie = kcalloc(n: iebufsz, size: num_bands, GFP_KERNEL); |
1328 | if (!ie) { |
1329 | ret = -ENOMEM; |
1330 | goto out; |
1331 | } |
1332 | |
1333 | ieee80211_prepare_scan_chandef(chandef: &chandef); |
1334 | |
1335 | ret = ieee80211_build_preq_ies(sdata, buffer: ie, buffer_len: num_bands * iebufsz, |
1336 | ie_desc: &sched_scan_ies, ie: req->ie, |
1337 | ie_len: req->ie_len, bands_used, rate_masks, |
1338 | chandef: &chandef, flags); |
1339 | if (ret < 0) |
1340 | goto error; |
1341 | |
1342 | ret = drv_sched_scan_start(local, sdata, req, ies: &sched_scan_ies); |
1343 | if (ret == 0) { |
1344 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
1345 | rcu_assign_pointer(local->sched_scan_req, req); |
1346 | } |
1347 | |
1348 | error: |
1349 | kfree(objp: ie); |
1350 | out: |
1351 | if (ret) { |
1352 | /* Clean in case of failure after HW restart or upon resume. */ |
1353 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
1354 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
1355 | } |
1356 | |
1357 | return ret; |
1358 | } |
1359 | |
1360 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1361 | struct cfg80211_sched_scan_request *req) |
1362 | { |
1363 | struct ieee80211_local *local = sdata->local; |
1364 | |
1365 | lockdep_assert_wiphy(local->hw.wiphy); |
1366 | |
1367 | if (rcu_access_pointer(local->sched_scan_sdata)) |
1368 | return -EBUSY; |
1369 | |
1370 | return __ieee80211_request_sched_scan_start(sdata, req); |
1371 | } |
1372 | |
1373 | int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) |
1374 | { |
1375 | struct ieee80211_sub_if_data *sched_scan_sdata; |
1376 | int ret = -ENOENT; |
1377 | |
1378 | lockdep_assert_wiphy(local->hw.wiphy); |
1379 | |
1380 | if (!local->ops->sched_scan_stop) |
1381 | return -EOPNOTSUPP; |
1382 | |
1383 | /* We don't want to restart sched scan anymore. */ |
1384 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
1385 | |
1386 | sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, |
1387 | lockdep_is_held(&local->hw.wiphy->mtx)); |
1388 | if (sched_scan_sdata) { |
1389 | ret = drv_sched_scan_stop(local, sdata: sched_scan_sdata); |
1390 | if (!ret) |
1391 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
1392 | } |
1393 | |
1394 | return ret; |
1395 | } |
1396 | |
1397 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) |
1398 | { |
1399 | struct ieee80211_local *local = hw_to_local(hw); |
1400 | |
1401 | trace_api_sched_scan_results(local); |
1402 | |
1403 | cfg80211_sched_scan_results(wiphy: hw->wiphy, reqid: 0); |
1404 | } |
1405 | EXPORT_SYMBOL(ieee80211_sched_scan_results); |
1406 | |
1407 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
1408 | { |
1409 | lockdep_assert_wiphy(local->hw.wiphy); |
1410 | |
1411 | if (!rcu_access_pointer(local->sched_scan_sdata)) |
1412 | return; |
1413 | |
1414 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
1415 | |
1416 | /* If sched scan was aborted by the driver. */ |
1417 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
1418 | |
1419 | cfg80211_sched_scan_stopped_locked(wiphy: local->hw.wiphy, reqid: 0); |
1420 | } |
1421 | |
1422 | void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy, |
1423 | struct wiphy_work *work) |
1424 | { |
1425 | struct ieee80211_local *local = |
1426 | container_of(work, struct ieee80211_local, |
1427 | sched_scan_stopped_work); |
1428 | |
1429 | ieee80211_sched_scan_end(local); |
1430 | } |
1431 | |
1432 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1433 | { |
1434 | struct ieee80211_local *local = hw_to_local(hw); |
1435 | |
1436 | trace_api_sched_scan_stopped(local); |
1437 | |
1438 | /* |
1439 | * this shouldn't really happen, so for simplicity |
1440 | * simply ignore it, and let mac80211 reconfigure |
1441 | * the sched scan later on. |
1442 | */ |
1443 | if (local->in_reconfig) |
1444 | return; |
1445 | |
1446 | wiphy_work_queue(wiphy: hw->wiphy, work: &local->sched_scan_stopped_work); |
1447 | } |
1448 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |
1449 | |