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) 2018-2023 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 | bss_meta.parent_tsf = |
198 | ieee80211_calculate_rx_timestamp(local, status: rx_status, |
199 | mpdu_len: len + FCS_LEN, mpdu_offset: 24); |
200 | ether_addr_copy(dst: bss_meta.parent_bssid, |
201 | src: scan_sdata->vif.bss_conf.bssid); |
202 | } |
203 | rcu_read_unlock(); |
204 | |
205 | cbss = cfg80211_inform_bss_frame_data(wiphy: local->hw.wiphy, data: &bss_meta, |
206 | mgmt, len, GFP_ATOMIC); |
207 | if (!cbss) |
208 | return NULL; |
209 | |
210 | /* In case the signal is invalid update the status */ |
211 | signal_valid = channel == cbss->channel; |
212 | if (!signal_valid) |
213 | rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; |
214 | |
215 | return (void *)cbss->priv; |
216 | } |
217 | |
218 | static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata, |
219 | u32 scan_flags, const u8 *da) |
220 | { |
221 | if (!sdata) |
222 | return false; |
223 | /* accept broadcast for OCE */ |
224 | if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP && |
225 | is_broadcast_ether_addr(addr: da)) |
226 | return true; |
227 | if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
228 | return true; |
229 | return ether_addr_equal(addr1: da, addr2: sdata->vif.addr); |
230 | } |
231 | |
232 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
233 | { |
234 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
235 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
236 | struct ieee80211_mgmt *mgmt = (void *)skb->data; |
237 | struct ieee80211_bss *bss; |
238 | struct ieee80211_channel *channel; |
239 | size_t min_hdr_len = offsetof(struct ieee80211_mgmt, |
240 | u.probe_resp.variable); |
241 | |
242 | if (!ieee80211_is_probe_resp(fc: mgmt->frame_control) && |
243 | !ieee80211_is_beacon(fc: mgmt->frame_control) && |
244 | !ieee80211_is_s1g_beacon(fc: mgmt->frame_control)) |
245 | return; |
246 | |
247 | if (ieee80211_is_s1g_beacon(fc: mgmt->frame_control)) { |
248 | if (ieee80211_is_s1g_short_beacon(fc: mgmt->frame_control)) |
249 | min_hdr_len = offsetof(struct ieee80211_ext, |
250 | u.s1g_short_beacon.variable); |
251 | else |
252 | min_hdr_len = offsetof(struct ieee80211_ext, |
253 | u.s1g_beacon); |
254 | } |
255 | |
256 | if (skb->len < min_hdr_len) |
257 | return; |
258 | |
259 | sdata1 = rcu_dereference(local->scan_sdata); |
260 | sdata2 = rcu_dereference(local->sched_scan_sdata); |
261 | |
262 | if (likely(!sdata1 && !sdata2)) |
263 | return; |
264 | |
265 | if (test_and_clear_bit(nr: SCAN_BEACON_WAIT, addr: &local->scanning)) { |
266 | /* |
267 | * we were passive scanning because of radar/no-IR, but |
268 | * the beacon/proberesp rx gives us an opportunity to upgrade |
269 | * to active scan |
270 | */ |
271 | set_bit(nr: SCAN_BEACON_DONE, addr: &local->scanning); |
272 | wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, delay: 0); |
273 | } |
274 | |
275 | if (ieee80211_is_probe_resp(fc: mgmt->frame_control)) { |
276 | struct cfg80211_scan_request *scan_req; |
277 | struct cfg80211_sched_scan_request *sched_scan_req; |
278 | u32 scan_req_flags = 0, sched_scan_req_flags = 0; |
279 | |
280 | scan_req = rcu_dereference(local->scan_req); |
281 | sched_scan_req = rcu_dereference(local->sched_scan_req); |
282 | |
283 | if (scan_req) |
284 | scan_req_flags = scan_req->flags; |
285 | |
286 | if (sched_scan_req) |
287 | sched_scan_req_flags = sched_scan_req->flags; |
288 | |
289 | /* ignore ProbeResp to foreign address or non-bcast (OCE) |
290 | * unless scanning with randomised address |
291 | */ |
292 | if (!ieee80211_scan_accept_presp(sdata: sdata1, scan_flags: scan_req_flags, |
293 | da: mgmt->da) && |
294 | !ieee80211_scan_accept_presp(sdata: sdata2, scan_flags: sched_scan_req_flags, |
295 | da: mgmt->da)) |
296 | return; |
297 | } |
298 | |
299 | channel = ieee80211_get_channel_khz(wiphy: local->hw.wiphy, |
300 | freq: ieee80211_rx_status_to_khz(rx_status)); |
301 | |
302 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) |
303 | return; |
304 | |
305 | bss = ieee80211_bss_info_update(local, rx_status, |
306 | mgmt, len: skb->len, |
307 | channel); |
308 | if (bss) |
309 | ieee80211_rx_bss_put(local, bss); |
310 | } |
311 | |
312 | static void ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef) |
313 | { |
314 | memset(chandef, 0, sizeof(*chandef)); |
315 | |
316 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; |
317 | } |
318 | |
319 | /* return false if no more work */ |
320 | static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata) |
321 | { |
322 | struct ieee80211_local *local = sdata->local; |
323 | struct cfg80211_scan_request *req; |
324 | struct cfg80211_chan_def chandef; |
325 | u8 bands_used = 0; |
326 | int i, ielen, n_chans; |
327 | u32 flags = 0; |
328 | |
329 | req = rcu_dereference_protected(local->scan_req, |
330 | lockdep_is_held(&local->hw.wiphy->mtx)); |
331 | |
332 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
333 | return false; |
334 | |
335 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
336 | for (i = 0; i < req->n_channels; i++) { |
337 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
338 | bands_used |= BIT(req->channels[i]->band); |
339 | } |
340 | |
341 | n_chans = req->n_channels; |
342 | } else { |
343 | do { |
344 | if (local->hw_scan_band == NUM_NL80211_BANDS) |
345 | return false; |
346 | |
347 | n_chans = 0; |
348 | |
349 | for (i = 0; i < req->n_channels; i++) { |
350 | if (req->channels[i]->band != |
351 | local->hw_scan_band) |
352 | continue; |
353 | local->hw_scan_req->req.channels[n_chans] = |
354 | req->channels[i]; |
355 | n_chans++; |
356 | bands_used |= BIT(req->channels[i]->band); |
357 | } |
358 | |
359 | local->hw_scan_band++; |
360 | } while (!n_chans); |
361 | } |
362 | |
363 | local->hw_scan_req->req.n_channels = n_chans; |
364 | ieee80211_prepare_scan_chandef(chandef: &chandef); |
365 | |
366 | if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
367 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; |
368 | |
369 | ielen = ieee80211_build_preq_ies(sdata, |
370 | buffer: (u8 *)local->hw_scan_req->req.ie, |
371 | buffer_len: local->hw_scan_ies_bufsize, |
372 | ie_desc: &local->hw_scan_req->ies, |
373 | ie: req->ie, ie_len: req->ie_len, |
374 | bands_used, rate_masks: req->rates, chandef: &chandef, |
375 | flags); |
376 | local->hw_scan_req->req.ie_len = ielen; |
377 | local->hw_scan_req->req.no_cck = req->no_cck; |
378 | ether_addr_copy(dst: local->hw_scan_req->req.mac_addr, src: req->mac_addr); |
379 | ether_addr_copy(dst: local->hw_scan_req->req.mac_addr_mask, |
380 | src: req->mac_addr_mask); |
381 | ether_addr_copy(dst: local->hw_scan_req->req.bssid, src: req->bssid); |
382 | |
383 | return true; |
384 | } |
385 | |
386 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
387 | { |
388 | struct ieee80211_local *local = hw_to_local(hw); |
389 | bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
390 | bool was_scanning = local->scanning; |
391 | struct cfg80211_scan_request *scan_req; |
392 | struct ieee80211_sub_if_data *scan_sdata; |
393 | struct ieee80211_sub_if_data *sdata; |
394 | |
395 | lockdep_assert_wiphy(local->hw.wiphy); |
396 | |
397 | /* |
398 | * It's ok to abort a not-yet-running scan (that |
399 | * we have one at all will be verified by checking |
400 | * local->scan_req next), but not to complete it |
401 | * successfully. |
402 | */ |
403 | if (WARN_ON(!local->scanning && !aborted)) |
404 | aborted = true; |
405 | |
406 | if (WARN_ON(!local->scan_req)) |
407 | return; |
408 | |
409 | scan_sdata = rcu_dereference_protected(local->scan_sdata, |
410 | lockdep_is_held(&local->hw.wiphy->mtx)); |
411 | |
412 | if (hw_scan && !aborted && |
413 | !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && |
414 | ieee80211_prep_hw_scan(sdata: scan_sdata)) { |
415 | int rc; |
416 | |
417 | rc = drv_hw_scan(local, |
418 | rcu_dereference_protected(local->scan_sdata, |
419 | lockdep_is_held(&local->hw.wiphy->mtx)), |
420 | req: local->hw_scan_req); |
421 | |
422 | if (rc == 0) |
423 | return; |
424 | |
425 | /* HW scan failed and is going to be reported as aborted, |
426 | * so clear old scan info. |
427 | */ |
428 | memset(&local->scan_info, 0, sizeof(local->scan_info)); |
429 | aborted = true; |
430 | } |
431 | |
432 | kfree(objp: local->hw_scan_req); |
433 | local->hw_scan_req = NULL; |
434 | |
435 | scan_req = rcu_dereference_protected(local->scan_req, |
436 | lockdep_is_held(&local->hw.wiphy->mtx)); |
437 | |
438 | RCU_INIT_POINTER(local->scan_req, NULL); |
439 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
440 | |
441 | local->scanning = 0; |
442 | local->scan_chandef.chan = NULL; |
443 | |
444 | synchronize_rcu(); |
445 | |
446 | if (scan_req != local->int_scan_req) { |
447 | local->scan_info.aborted = aborted; |
448 | cfg80211_scan_done(request: scan_req, info: &local->scan_info); |
449 | } |
450 | |
451 | /* Set power back to normal operating levels. */ |
452 | ieee80211_hw_config(local, changed: 0); |
453 | |
454 | if (!hw_scan && was_scanning) { |
455 | ieee80211_configure_filter(local); |
456 | drv_sw_scan_complete(local, sdata: scan_sdata); |
457 | ieee80211_offchannel_return(local); |
458 | } |
459 | |
460 | ieee80211_recalc_idle(local); |
461 | |
462 | ieee80211_mlme_notify_scan_completed(local); |
463 | ieee80211_ibss_notify_scan_completed(local); |
464 | |
465 | /* Requeue all the work that might have been ignored while |
466 | * the scan was in progress; if there was none this will |
467 | * just be a no-op for the particular interface. |
468 | */ |
469 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
470 | if (ieee80211_sdata_running(sdata)) |
471 | wiphy_work_queue(wiphy: sdata->local->hw.wiphy, work: &sdata->work); |
472 | } |
473 | |
474 | if (was_scanning) |
475 | ieee80211_start_next_roc(local); |
476 | } |
477 | |
478 | void ieee80211_scan_completed(struct ieee80211_hw *hw, |
479 | struct cfg80211_scan_info *info) |
480 | { |
481 | struct ieee80211_local *local = hw_to_local(hw); |
482 | |
483 | trace_api_scan_completed(local, aborted: info->aborted); |
484 | |
485 | set_bit(nr: SCAN_COMPLETED, addr: &local->scanning); |
486 | if (info->aborted) |
487 | set_bit(nr: SCAN_ABORTED, addr: &local->scanning); |
488 | |
489 | memcpy(&local->scan_info, info, sizeof(*info)); |
490 | |
491 | wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, delay: 0); |
492 | } |
493 | EXPORT_SYMBOL(ieee80211_scan_completed); |
494 | |
495 | static int ieee80211_start_sw_scan(struct ieee80211_local *local, |
496 | struct ieee80211_sub_if_data *sdata) |
497 | { |
498 | /* Software scan is not supported in multi-channel cases */ |
499 | if (local->use_chanctx) |
500 | return -EOPNOTSUPP; |
501 | |
502 | /* |
503 | * Hardware/driver doesn't support hw_scan, so use software |
504 | * scanning instead. First send a nullfunc frame with power save |
505 | * bit on so that AP will buffer the frames for us while we are not |
506 | * listening, then send probe requests to each channel and wait for |
507 | * the responses. After all channels are scanned, tune back to the |
508 | * original channel and send a nullfunc frame with power save bit |
509 | * off to trigger the AP to send us all the buffered frames. |
510 | * |
511 | * Note that while local->sw_scanning is true everything else but |
512 | * nullfunc frames and probe requests will be dropped in |
513 | * ieee80211_tx_h_check_assoc(). |
514 | */ |
515 | drv_sw_scan_start(local, sdata, mac_addr: local->scan_addr); |
516 | |
517 | local->leave_oper_channel_time = jiffies; |
518 | local->next_scan_state = SCAN_DECISION; |
519 | local->scan_channel_idx = 0; |
520 | |
521 | ieee80211_offchannel_stop_vifs(local); |
522 | |
523 | /* ensure nullfunc is transmitted before leaving operating channel */ |
524 | ieee80211_flush_queues(local, NULL, drop: false); |
525 | |
526 | ieee80211_configure_filter(local); |
527 | |
528 | /* We need to set power level at maximum rate for scanning. */ |
529 | ieee80211_hw_config(local, changed: 0); |
530 | |
531 | wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, delay: 0); |
532 | |
533 | return 0; |
534 | } |
535 | |
536 | static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata) |
537 | { |
538 | struct ieee80211_local *local = sdata->local; |
539 | struct ieee80211_sub_if_data *sdata_iter; |
540 | |
541 | lockdep_assert_wiphy(local->hw.wiphy); |
542 | |
543 | if (!ieee80211_is_radar_required(local)) |
544 | return true; |
545 | |
546 | if (!regulatory_pre_cac_allowed(wiphy: local->hw.wiphy)) |
547 | return false; |
548 | |
549 | list_for_each_entry(sdata_iter, &local->interfaces, list) { |
550 | if (sdata_iter->wdev.cac_started) |
551 | return false; |
552 | } |
553 | |
554 | return true; |
555 | } |
556 | |
557 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
558 | struct ieee80211_sub_if_data *sdata) |
559 | { |
560 | if (!__ieee80211_can_leave_ch(sdata)) |
561 | return false; |
562 | |
563 | if (!list_empty(head: &local->roc_list)) |
564 | return false; |
565 | |
566 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
567 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
568 | return false; |
569 | |
570 | return true; |
571 | } |
572 | |
573 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) |
574 | { |
575 | lockdep_assert_wiphy(local->hw.wiphy); |
576 | |
577 | if (!local->scan_req || local->scanning) |
578 | return; |
579 | |
580 | if (!ieee80211_can_scan(local, |
581 | rcu_dereference_protected( |
582 | local->scan_sdata, |
583 | lockdep_is_held(&local->hw.wiphy->mtx)))) |
584 | return; |
585 | |
586 | wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, |
587 | delay: round_jiffies_relative(j: 0)); |
588 | } |
589 | |
590 | static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, |
591 | const u8 *src, const u8 *dst, |
592 | const u8 *ssid, size_t ssid_len, |
593 | const u8 *ie, size_t ie_len, |
594 | u32 ratemask, u32 flags, u32 tx_flags, |
595 | struct ieee80211_channel *channel) |
596 | { |
597 | struct sk_buff *skb; |
598 | |
599 | skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, chan: channel, |
600 | ssid, ssid_len, |
601 | ie, ie_len, flags); |
602 | |
603 | if (skb) { |
604 | if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { |
605 | struct ieee80211_hdr *hdr = (void *)skb->data; |
606 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
607 | u16 sn = get_random_u16(); |
608 | |
609 | info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; |
610 | hdr->seq_ctrl = |
611 | cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); |
612 | } |
613 | IEEE80211_SKB_CB(skb)->flags |= tx_flags; |
614 | ieee80211_tx_skb_tid_band(sdata, skb, tid: 7, band: channel->band); |
615 | } |
616 | } |
617 | |
618 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
619 | unsigned long *next_delay) |
620 | { |
621 | int i; |
622 | struct ieee80211_sub_if_data *sdata; |
623 | struct cfg80211_scan_request *scan_req; |
624 | enum nl80211_band band = local->hw.conf.chandef.chan->band; |
625 | u32 flags = 0, tx_flags; |
626 | |
627 | scan_req = rcu_dereference_protected(local->scan_req, |
628 | lockdep_is_held(&local->hw.wiphy->mtx)); |
629 | |
630 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
631 | if (scan_req->no_cck) |
632 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
633 | if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
634 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; |
635 | if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) |
636 | flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; |
637 | |
638 | sdata = rcu_dereference_protected(local->scan_sdata, |
639 | lockdep_is_held(&local->hw.wiphy->mtx)); |
640 | |
641 | for (i = 0; i < scan_req->n_ssids; i++) |
642 | ieee80211_send_scan_probe_req( |
643 | sdata, src: local->scan_addr, dst: scan_req->bssid, |
644 | ssid: scan_req->ssids[i].ssid, ssid_len: scan_req->ssids[i].ssid_len, |
645 | ie: scan_req->ie, ie_len: scan_req->ie_len, |
646 | ratemask: scan_req->rates[band], flags, |
647 | tx_flags, channel: local->hw.conf.chandef.chan); |
648 | |
649 | /* |
650 | * After sending probe requests, wait for probe responses |
651 | * on the channel. |
652 | */ |
653 | *next_delay = IEEE80211_CHANNEL_TIME; |
654 | local->next_scan_state = SCAN_DECISION; |
655 | } |
656 | |
657 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
658 | struct cfg80211_scan_request *req) |
659 | { |
660 | struct ieee80211_local *local = sdata->local; |
661 | bool hw_scan = local->ops->hw_scan; |
662 | int rc; |
663 | |
664 | lockdep_assert_wiphy(local->hw.wiphy); |
665 | |
666 | if (local->scan_req) |
667 | return -EBUSY; |
668 | |
669 | if (!__ieee80211_can_leave_ch(sdata)) |
670 | return -EBUSY; |
671 | |
672 | if (!ieee80211_can_scan(local, sdata)) { |
673 | /* wait for the work to finish/time out */ |
674 | rcu_assign_pointer(local->scan_req, req); |
675 | rcu_assign_pointer(local->scan_sdata, sdata); |
676 | return 0; |
677 | } |
678 | |
679 | again: |
680 | if (hw_scan) { |
681 | u8 *ies; |
682 | |
683 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
684 | |
685 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
686 | int i, n_bands = 0; |
687 | u8 bands_counted = 0; |
688 | |
689 | for (i = 0; i < req->n_channels; i++) { |
690 | if (bands_counted & BIT(req->channels[i]->band)) |
691 | continue; |
692 | bands_counted |= BIT(req->channels[i]->band); |
693 | n_bands++; |
694 | } |
695 | |
696 | local->hw_scan_ies_bufsize *= n_bands; |
697 | } |
698 | |
699 | local->hw_scan_req = kmalloc( |
700 | size: sizeof(*local->hw_scan_req) + |
701 | req->n_channels * sizeof(req->channels[0]) + |
702 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
703 | if (!local->hw_scan_req) |
704 | return -ENOMEM; |
705 | |
706 | local->hw_scan_req->req.ssids = req->ssids; |
707 | local->hw_scan_req->req.n_ssids = req->n_ssids; |
708 | ies = (u8 *)local->hw_scan_req + |
709 | sizeof(*local->hw_scan_req) + |
710 | req->n_channels * sizeof(req->channels[0]); |
711 | local->hw_scan_req->req.ie = ies; |
712 | local->hw_scan_req->req.flags = req->flags; |
713 | eth_broadcast_addr(addr: local->hw_scan_req->req.bssid); |
714 | local->hw_scan_req->req.duration = req->duration; |
715 | local->hw_scan_req->req.duration_mandatory = |
716 | req->duration_mandatory; |
717 | |
718 | local->hw_scan_band = 0; |
719 | local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params; |
720 | local->hw_scan_req->req.scan_6ghz_params = |
721 | req->scan_6ghz_params; |
722 | local->hw_scan_req->req.scan_6ghz = req->scan_6ghz; |
723 | |
724 | /* |
725 | * After allocating local->hw_scan_req, we must |
726 | * go through until ieee80211_prep_hw_scan(), so |
727 | * anything that might be changed here and leave |
728 | * this function early must not go after this |
729 | * allocation. |
730 | */ |
731 | } |
732 | |
733 | rcu_assign_pointer(local->scan_req, req); |
734 | rcu_assign_pointer(local->scan_sdata, sdata); |
735 | |
736 | if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
737 | get_random_mask_addr(buf: local->scan_addr, |
738 | addr: req->mac_addr, |
739 | mask: req->mac_addr_mask); |
740 | else |
741 | memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); |
742 | |
743 | if (hw_scan) { |
744 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
745 | } else if ((req->n_channels == 1) && |
746 | (req->channels[0] == local->_oper_chandef.chan)) { |
747 | /* |
748 | * If we are scanning only on the operating channel |
749 | * then we do not need to stop normal activities |
750 | */ |
751 | unsigned long next_delay; |
752 | |
753 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); |
754 | |
755 | ieee80211_recalc_idle(local); |
756 | |
757 | /* Notify driver scan is starting, keep order of operations |
758 | * same as normal software scan, in case that matters. */ |
759 | drv_sw_scan_start(local, sdata, mac_addr: local->scan_addr); |
760 | |
761 | ieee80211_configure_filter(local); /* accept probe-responses */ |
762 | |
763 | /* We need to ensure power level is at max for scanning. */ |
764 | ieee80211_hw_config(local, changed: 0); |
765 | |
766 | if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | |
767 | IEEE80211_CHAN_RADAR)) || |
768 | !req->n_ssids) { |
769 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
770 | if (req->n_ssids) |
771 | set_bit(nr: SCAN_BEACON_WAIT, addr: &local->scanning); |
772 | } else { |
773 | ieee80211_scan_state_send_probe(local, next_delay: &next_delay); |
774 | next_delay = IEEE80211_CHANNEL_TIME; |
775 | } |
776 | |
777 | /* Now, just wait a bit and we are all done! */ |
778 | wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, |
779 | delay: next_delay); |
780 | return 0; |
781 | } else { |
782 | /* Do normal software scan */ |
783 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
784 | } |
785 | |
786 | ieee80211_recalc_idle(local); |
787 | |
788 | if (hw_scan) { |
789 | WARN_ON(!ieee80211_prep_hw_scan(sdata)); |
790 | rc = drv_hw_scan(local, sdata, req: local->hw_scan_req); |
791 | } else { |
792 | rc = ieee80211_start_sw_scan(local, sdata); |
793 | } |
794 | |
795 | if (rc) { |
796 | kfree(objp: local->hw_scan_req); |
797 | local->hw_scan_req = NULL; |
798 | local->scanning = 0; |
799 | |
800 | ieee80211_recalc_idle(local); |
801 | |
802 | local->scan_req = NULL; |
803 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
804 | } |
805 | |
806 | if (hw_scan && rc == 1) { |
807 | /* |
808 | * we can't fall back to software for P2P-GO |
809 | * as it must update NoA etc. |
810 | */ |
811 | if (ieee80211_vif_type_p2p(vif: &sdata->vif) == |
812 | NL80211_IFTYPE_P2P_GO) |
813 | return -EOPNOTSUPP; |
814 | hw_scan = false; |
815 | goto again; |
816 | } |
817 | |
818 | return rc; |
819 | } |
820 | |
821 | static unsigned long |
822 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) |
823 | { |
824 | /* |
825 | * TODO: channel switching also consumes quite some time, |
826 | * add that delay as well to get a better estimation |
827 | */ |
828 | if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) |
829 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
830 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; |
831 | } |
832 | |
833 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
834 | unsigned long *next_delay) |
835 | { |
836 | bool associated = false; |
837 | bool tx_empty = true; |
838 | bool bad_latency; |
839 | struct ieee80211_sub_if_data *sdata; |
840 | struct ieee80211_channel *next_chan; |
841 | enum mac80211_scan_state next_scan_state; |
842 | struct cfg80211_scan_request *scan_req; |
843 | |
844 | lockdep_assert_wiphy(local->hw.wiphy); |
845 | |
846 | /* |
847 | * check if at least one STA interface is associated, |
848 | * check if at least one STA interface has pending tx frames |
849 | * and grab the lowest used beacon interval |
850 | */ |
851 | list_for_each_entry(sdata, &local->interfaces, list) { |
852 | if (!ieee80211_sdata_running(sdata)) |
853 | continue; |
854 | |
855 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
856 | if (sdata->u.mgd.associated) { |
857 | associated = true; |
858 | |
859 | if (!qdisc_all_tx_empty(dev: sdata->dev)) { |
860 | tx_empty = false; |
861 | break; |
862 | } |
863 | } |
864 | } |
865 | } |
866 | |
867 | scan_req = rcu_dereference_protected(local->scan_req, |
868 | lockdep_is_held(&local->hw.wiphy->mtx)); |
869 | |
870 | next_chan = scan_req->channels[local->scan_channel_idx]; |
871 | |
872 | /* |
873 | * we're currently scanning a different channel, let's |
874 | * see if we can scan another channel without interfering |
875 | * with the current traffic situation. |
876 | * |
877 | * Keep good latency, do not stay off-channel more than 125 ms. |
878 | */ |
879 | |
880 | bad_latency = time_after(jiffies + |
881 | ieee80211_scan_get_channel_time(next_chan), |
882 | local->leave_oper_channel_time + HZ / 8); |
883 | |
884 | if (associated && !tx_empty) { |
885 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
886 | next_scan_state = SCAN_ABORT; |
887 | else |
888 | next_scan_state = SCAN_SUSPEND; |
889 | } else if (associated && bad_latency) { |
890 | next_scan_state = SCAN_SUSPEND; |
891 | } else { |
892 | next_scan_state = SCAN_SET_CHANNEL; |
893 | } |
894 | |
895 | local->next_scan_state = next_scan_state; |
896 | |
897 | *next_delay = 0; |
898 | } |
899 | |
900 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
901 | unsigned long *next_delay) |
902 | { |
903 | int skip; |
904 | struct ieee80211_channel *chan; |
905 | struct cfg80211_scan_request *scan_req; |
906 | |
907 | scan_req = rcu_dereference_protected(local->scan_req, |
908 | lockdep_is_held(&local->hw.wiphy->mtx)); |
909 | |
910 | skip = 0; |
911 | chan = scan_req->channels[local->scan_channel_idx]; |
912 | |
913 | local->scan_chandef.chan = chan; |
914 | local->scan_chandef.center_freq1 = chan->center_freq; |
915 | local->scan_chandef.freq1_offset = chan->freq_offset; |
916 | local->scan_chandef.center_freq2 = 0; |
917 | |
918 | /* For scanning on the S1G band, detect the channel width according to |
919 | * the channel being scanned. |
920 | */ |
921 | if (chan->band == NL80211_BAND_S1GHZ) { |
922 | local->scan_chandef.width = ieee80211_s1g_channel_width(chan); |
923 | goto set_channel; |
924 | } |
925 | |
926 | /* If scanning on oper channel, use whatever channel-type |
927 | * is currently in use. |
928 | */ |
929 | if (chan == local->_oper_chandef.chan) |
930 | local->scan_chandef = local->_oper_chandef; |
931 | else |
932 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; |
933 | |
934 | set_channel: |
935 | if (ieee80211_hw_config(local, changed: IEEE80211_CONF_CHANGE_CHANNEL)) |
936 | skip = 1; |
937 | |
938 | /* advance state machine to next channel/band */ |
939 | local->scan_channel_idx++; |
940 | |
941 | if (skip) { |
942 | /* if we skip this channel return to the decision state */ |
943 | local->next_scan_state = SCAN_DECISION; |
944 | return; |
945 | } |
946 | |
947 | /* |
948 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 |
949 | * (which unfortunately doesn't say _why_ step a) is done, |
950 | * but it waits for the probe delay or until a frame is |
951 | * received - and the received frame would update the NAV). |
952 | * For now, we do not support waiting until a frame is |
953 | * received. |
954 | * |
955 | * In any case, it is not necessary for a passive scan. |
956 | */ |
957 | if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || |
958 | !scan_req->n_ssids) { |
959 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
960 | local->next_scan_state = SCAN_DECISION; |
961 | if (scan_req->n_ssids) |
962 | set_bit(nr: SCAN_BEACON_WAIT, addr: &local->scanning); |
963 | return; |
964 | } |
965 | |
966 | /* active scan, send probes */ |
967 | *next_delay = IEEE80211_PROBE_DELAY; |
968 | local->next_scan_state = SCAN_SEND_PROBE; |
969 | } |
970 | |
971 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
972 | unsigned long *next_delay) |
973 | { |
974 | /* switch back to the operating channel */ |
975 | local->scan_chandef.chan = NULL; |
976 | ieee80211_hw_config(local, changed: IEEE80211_CONF_CHANGE_CHANNEL); |
977 | |
978 | /* disable PS */ |
979 | ieee80211_offchannel_return(local); |
980 | |
981 | *next_delay = HZ / 5; |
982 | /* afterwards, resume scan & go to next channel */ |
983 | local->next_scan_state = SCAN_RESUME; |
984 | } |
985 | |
986 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, |
987 | unsigned long *next_delay) |
988 | { |
989 | ieee80211_offchannel_stop_vifs(local); |
990 | |
991 | if (local->ops->flush) { |
992 | ieee80211_flush_queues(local, NULL, drop: false); |
993 | *next_delay = 0; |
994 | } else |
995 | *next_delay = HZ / 10; |
996 | |
997 | /* remember when we left the operating channel */ |
998 | local->leave_oper_channel_time = jiffies; |
999 | |
1000 | /* advance to the next channel to be scanned */ |
1001 | local->next_scan_state = SCAN_SET_CHANNEL; |
1002 | } |
1003 | |
1004 | void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work) |
1005 | { |
1006 | struct ieee80211_local *local = |
1007 | container_of(work, struct ieee80211_local, scan_work.work); |
1008 | struct ieee80211_sub_if_data *sdata; |
1009 | struct cfg80211_scan_request *scan_req; |
1010 | unsigned long next_delay = 0; |
1011 | bool aborted; |
1012 | |
1013 | lockdep_assert_wiphy(local->hw.wiphy); |
1014 | |
1015 | if (!ieee80211_can_run_worker(local)) { |
1016 | aborted = true; |
1017 | goto out_complete; |
1018 | } |
1019 | |
1020 | sdata = rcu_dereference_protected(local->scan_sdata, |
1021 | lockdep_is_held(&local->hw.wiphy->mtx)); |
1022 | scan_req = rcu_dereference_protected(local->scan_req, |
1023 | lockdep_is_held(&local->hw.wiphy->mtx)); |
1024 | |
1025 | /* When scanning on-channel, the first-callback means completed. */ |
1026 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { |
1027 | aborted = test_and_clear_bit(nr: SCAN_ABORTED, addr: &local->scanning); |
1028 | goto out_complete; |
1029 | } |
1030 | |
1031 | if (test_and_clear_bit(nr: SCAN_COMPLETED, addr: &local->scanning)) { |
1032 | aborted = test_and_clear_bit(nr: SCAN_ABORTED, addr: &local->scanning); |
1033 | goto out_complete; |
1034 | } |
1035 | |
1036 | if (!sdata || !scan_req) |
1037 | return; |
1038 | |
1039 | if (!local->scanning) { |
1040 | int rc; |
1041 | |
1042 | RCU_INIT_POINTER(local->scan_req, NULL); |
1043 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
1044 | |
1045 | rc = __ieee80211_start_scan(sdata, req: scan_req); |
1046 | if (!rc) |
1047 | return; |
1048 | /* need to complete scan in cfg80211 */ |
1049 | rcu_assign_pointer(local->scan_req, scan_req); |
1050 | aborted = true; |
1051 | goto out_complete; |
1052 | } |
1053 | |
1054 | clear_bit(nr: SCAN_BEACON_WAIT, addr: &local->scanning); |
1055 | |
1056 | /* |
1057 | * as long as no delay is required advance immediately |
1058 | * without scheduling a new work |
1059 | */ |
1060 | do { |
1061 | if (!ieee80211_sdata_running(sdata)) { |
1062 | aborted = true; |
1063 | goto out_complete; |
1064 | } |
1065 | |
1066 | if (test_and_clear_bit(nr: SCAN_BEACON_DONE, addr: &local->scanning) && |
1067 | local->next_scan_state == SCAN_DECISION) |
1068 | local->next_scan_state = SCAN_SEND_PROBE; |
1069 | |
1070 | switch (local->next_scan_state) { |
1071 | case SCAN_DECISION: |
1072 | /* if no more bands/channels left, complete scan */ |
1073 | if (local->scan_channel_idx >= scan_req->n_channels) { |
1074 | aborted = false; |
1075 | goto out_complete; |
1076 | } |
1077 | ieee80211_scan_state_decision(local, next_delay: &next_delay); |
1078 | break; |
1079 | case SCAN_SET_CHANNEL: |
1080 | ieee80211_scan_state_set_channel(local, next_delay: &next_delay); |
1081 | break; |
1082 | case SCAN_SEND_PROBE: |
1083 | ieee80211_scan_state_send_probe(local, next_delay: &next_delay); |
1084 | break; |
1085 | case SCAN_SUSPEND: |
1086 | ieee80211_scan_state_suspend(local, next_delay: &next_delay); |
1087 | break; |
1088 | case SCAN_RESUME: |
1089 | ieee80211_scan_state_resume(local, next_delay: &next_delay); |
1090 | break; |
1091 | case SCAN_ABORT: |
1092 | aborted = true; |
1093 | goto out_complete; |
1094 | } |
1095 | } while (next_delay == 0); |
1096 | |
1097 | wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, |
1098 | delay: next_delay); |
1099 | return; |
1100 | |
1101 | out_complete: |
1102 | __ieee80211_scan_completed(hw: &local->hw, aborted); |
1103 | } |
1104 | |
1105 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
1106 | struct cfg80211_scan_request *req) |
1107 | { |
1108 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
1109 | |
1110 | return __ieee80211_start_scan(sdata, req); |
1111 | } |
1112 | |
1113 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
1114 | const u8 *ssid, u8 ssid_len, |
1115 | struct ieee80211_channel **channels, |
1116 | unsigned int n_channels) |
1117 | { |
1118 | struct ieee80211_local *local = sdata->local; |
1119 | int ret = -EBUSY, i, n_ch = 0; |
1120 | enum nl80211_band band; |
1121 | |
1122 | lockdep_assert_wiphy(local->hw.wiphy); |
1123 | |
1124 | /* busy scanning */ |
1125 | if (local->scan_req) |
1126 | goto unlock; |
1127 | |
1128 | /* fill internal scan request */ |
1129 | if (!channels) { |
1130 | int max_n; |
1131 | |
1132 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
1133 | if (!local->hw.wiphy->bands[band] || |
1134 | band == NL80211_BAND_6GHZ) |
1135 | continue; |
1136 | |
1137 | max_n = local->hw.wiphy->bands[band]->n_channels; |
1138 | for (i = 0; i < max_n; i++) { |
1139 | struct ieee80211_channel *tmp_ch = |
1140 | &local->hw.wiphy->bands[band]->channels[i]; |
1141 | |
1142 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
1143 | IEEE80211_CHAN_DISABLED)) |
1144 | continue; |
1145 | |
1146 | local->int_scan_req->channels[n_ch] = tmp_ch; |
1147 | n_ch++; |
1148 | } |
1149 | } |
1150 | |
1151 | if (WARN_ON_ONCE(n_ch == 0)) |
1152 | goto unlock; |
1153 | |
1154 | local->int_scan_req->n_channels = n_ch; |
1155 | } else { |
1156 | for (i = 0; i < n_channels; i++) { |
1157 | if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | |
1158 | IEEE80211_CHAN_DISABLED)) |
1159 | continue; |
1160 | |
1161 | local->int_scan_req->channels[n_ch] = channels[i]; |
1162 | n_ch++; |
1163 | } |
1164 | |
1165 | if (WARN_ON_ONCE(n_ch == 0)) |
1166 | goto unlock; |
1167 | |
1168 | local->int_scan_req->n_channels = n_ch; |
1169 | } |
1170 | |
1171 | local->int_scan_req->ssids = &local->scan_ssid; |
1172 | local->int_scan_req->n_ssids = 1; |
1173 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
1174 | local->int_scan_req->ssids[0].ssid_len = ssid_len; |
1175 | |
1176 | ret = __ieee80211_start_scan(sdata, req: sdata->local->int_scan_req); |
1177 | unlock: |
1178 | return ret; |
1179 | } |
1180 | |
1181 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
1182 | { |
1183 | /* ensure a new scan cannot be queued */ |
1184 | lockdep_assert_wiphy(local->hw.wiphy); |
1185 | |
1186 | /* |
1187 | * We are canceling software scan, or deferred scan that was not |
1188 | * yet really started (see __ieee80211_start_scan ). |
1189 | * |
1190 | * Regarding hardware scan: |
1191 | * - we can not call __ieee80211_scan_completed() as when |
1192 | * SCAN_HW_SCANNING bit is set this function change |
1193 | * local->hw_scan_req to operate on 5G band, what race with |
1194 | * driver which can use local->hw_scan_req |
1195 | * |
1196 | * - we can not cancel scan_work since driver can schedule it |
1197 | * by ieee80211_scan_completed(..., true) to finish scan |
1198 | * |
1199 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
1200 | * driver is still responsible for calling ieee80211_scan_completed() |
1201 | * after the scan was completed/aborted. |
1202 | */ |
1203 | |
1204 | if (!local->scan_req) |
1205 | return; |
1206 | |
1207 | /* |
1208 | * We have a scan running and the driver already reported completion, |
1209 | * but the worker hasn't run yet or is stuck on the mutex - mark it as |
1210 | * cancelled. |
1211 | */ |
1212 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && |
1213 | test_bit(SCAN_COMPLETED, &local->scanning)) { |
1214 | set_bit(nr: SCAN_HW_CANCELLED, addr: &local->scanning); |
1215 | return; |
1216 | } |
1217 | |
1218 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
1219 | /* |
1220 | * Make sure that __ieee80211_scan_completed doesn't trigger a |
1221 | * scan on another band. |
1222 | */ |
1223 | set_bit(nr: SCAN_HW_CANCELLED, addr: &local->scanning); |
1224 | if (local->ops->cancel_hw_scan) |
1225 | drv_cancel_hw_scan(local, |
1226 | rcu_dereference_protected(local->scan_sdata, |
1227 | lockdep_is_held(&local->hw.wiphy->mtx))); |
1228 | return; |
1229 | } |
1230 | |
1231 | wiphy_delayed_work_cancel(wiphy: local->hw.wiphy, dwork: &local->scan_work); |
1232 | /* and clean up */ |
1233 | memset(&local->scan_info, 0, sizeof(local->scan_info)); |
1234 | __ieee80211_scan_completed(hw: &local->hw, aborted: true); |
1235 | } |
1236 | |
1237 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1238 | struct cfg80211_sched_scan_request *req) |
1239 | { |
1240 | struct ieee80211_local *local = sdata->local; |
1241 | struct ieee80211_scan_ies sched_scan_ies = {}; |
1242 | struct cfg80211_chan_def chandef; |
1243 | int ret, i, iebufsz, num_bands = 0; |
1244 | u32 rate_masks[NUM_NL80211_BANDS] = {}; |
1245 | u8 bands_used = 0; |
1246 | u8 *ie; |
1247 | u32 flags = 0; |
1248 | |
1249 | lockdep_assert_wiphy(local->hw.wiphy); |
1250 | |
1251 | iebufsz = local->scan_ies_len + req->ie_len; |
1252 | |
1253 | if (!local->ops->sched_scan_start) |
1254 | return -ENOTSUPP; |
1255 | |
1256 | for (i = 0; i < NUM_NL80211_BANDS; i++) { |
1257 | if (local->hw.wiphy->bands[i]) { |
1258 | bands_used |= BIT(i); |
1259 | rate_masks[i] = (u32) -1; |
1260 | num_bands++; |
1261 | } |
1262 | } |
1263 | |
1264 | if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) |
1265 | flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; |
1266 | |
1267 | ie = kcalloc(n: iebufsz, size: num_bands, GFP_KERNEL); |
1268 | if (!ie) { |
1269 | ret = -ENOMEM; |
1270 | goto out; |
1271 | } |
1272 | |
1273 | ieee80211_prepare_scan_chandef(chandef: &chandef); |
1274 | |
1275 | ieee80211_build_preq_ies(sdata, buffer: ie, buffer_len: num_bands * iebufsz, |
1276 | ie_desc: &sched_scan_ies, ie: req->ie, |
1277 | ie_len: req->ie_len, bands_used, rate_masks, chandef: &chandef, |
1278 | flags); |
1279 | |
1280 | ret = drv_sched_scan_start(local, sdata, req, ies: &sched_scan_ies); |
1281 | if (ret == 0) { |
1282 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
1283 | rcu_assign_pointer(local->sched_scan_req, req); |
1284 | } |
1285 | |
1286 | kfree(objp: ie); |
1287 | |
1288 | out: |
1289 | if (ret) { |
1290 | /* Clean in case of failure after HW restart or upon resume. */ |
1291 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
1292 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
1293 | } |
1294 | |
1295 | return ret; |
1296 | } |
1297 | |
1298 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1299 | struct cfg80211_sched_scan_request *req) |
1300 | { |
1301 | struct ieee80211_local *local = sdata->local; |
1302 | |
1303 | lockdep_assert_wiphy(local->hw.wiphy); |
1304 | |
1305 | if (rcu_access_pointer(local->sched_scan_sdata)) |
1306 | return -EBUSY; |
1307 | |
1308 | return __ieee80211_request_sched_scan_start(sdata, req); |
1309 | } |
1310 | |
1311 | int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) |
1312 | { |
1313 | struct ieee80211_sub_if_data *sched_scan_sdata; |
1314 | int ret = -ENOENT; |
1315 | |
1316 | lockdep_assert_wiphy(local->hw.wiphy); |
1317 | |
1318 | if (!local->ops->sched_scan_stop) |
1319 | return -ENOTSUPP; |
1320 | |
1321 | /* We don't want to restart sched scan anymore. */ |
1322 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
1323 | |
1324 | sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, |
1325 | lockdep_is_held(&local->hw.wiphy->mtx)); |
1326 | if (sched_scan_sdata) { |
1327 | ret = drv_sched_scan_stop(local, sdata: sched_scan_sdata); |
1328 | if (!ret) |
1329 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
1330 | } |
1331 | |
1332 | return ret; |
1333 | } |
1334 | |
1335 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) |
1336 | { |
1337 | struct ieee80211_local *local = hw_to_local(hw); |
1338 | |
1339 | trace_api_sched_scan_results(local); |
1340 | |
1341 | cfg80211_sched_scan_results(wiphy: hw->wiphy, reqid: 0); |
1342 | } |
1343 | EXPORT_SYMBOL(ieee80211_sched_scan_results); |
1344 | |
1345 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
1346 | { |
1347 | lockdep_assert_wiphy(local->hw.wiphy); |
1348 | |
1349 | if (!rcu_access_pointer(local->sched_scan_sdata)) |
1350 | return; |
1351 | |
1352 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
1353 | |
1354 | /* If sched scan was aborted by the driver. */ |
1355 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
1356 | |
1357 | cfg80211_sched_scan_stopped_locked(wiphy: local->hw.wiphy, reqid: 0); |
1358 | } |
1359 | |
1360 | void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy, |
1361 | struct wiphy_work *work) |
1362 | { |
1363 | struct ieee80211_local *local = |
1364 | container_of(work, struct ieee80211_local, |
1365 | sched_scan_stopped_work); |
1366 | |
1367 | ieee80211_sched_scan_end(local); |
1368 | } |
1369 | |
1370 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1371 | { |
1372 | struct ieee80211_local *local = hw_to_local(hw); |
1373 | |
1374 | trace_api_sched_scan_stopped(local); |
1375 | |
1376 | /* |
1377 | * this shouldn't really happen, so for simplicity |
1378 | * simply ignore it, and let mac80211 reconfigure |
1379 | * the sched scan later on. |
1380 | */ |
1381 | if (local->in_reconfig) |
1382 | return; |
1383 | |
1384 | wiphy_work_queue(wiphy: hw->wiphy, work: &local->sched_scan_stopped_work); |
1385 | } |
1386 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |
1387 | |