blob: 0805aa8603c61c652e0afba6a248eeb03d86503d [file] [log] [blame]
Thomas Gleixnerd2912cb2019-06-04 10:11:33 +02001// SPDX-License-Identifier: GPL-2.0-only
Johannes Berg0a51b272008-09-08 17:44:25 +02002/*
Johannes Berg5484e232008-09-08 17:44:27 +02003 * Scanning implementation
4 *
Johannes Berg0a51b272008-09-08 17:44:25 +02005 * 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>
Sara Sharon74d803b2015-06-03 10:44:17 +030010 * Copyright 2013-2015 Intel Mobile Communications GmbH
Roee Zamir40b0bd22017-08-06 11:38:23 +030011 * Copyright 2016-2017 Intel Deutschland GmbH
Benjamin Berg108d20222023-06-16 09:54:01 +030012 * Copyright (C) 2018-2023 Intel Corporation
Johannes Berg0a51b272008-09-08 17:44:25 +020013 */
14
Johannes Berg0a51b272008-09-08 17:44:25 +020015#include <linux/if_arp.h>
Felix Fietkau888d04d2012-03-01 15:22:09 +010016#include <linux/etherdevice.h>
Johannes Berg078e1e62009-01-22 18:07:31 +010017#include <linux/rtnetlink.h>
Helmut Schaadf13cce2010-02-24 14:19:21 +010018#include <net/sch_generic.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040020#include <linux/export.h>
Johannes Bergb9771d42018-05-28 15:47:41 +020021#include <linux/random.h>
Johannes Berg0a51b272008-09-08 17:44:25 +020022#include <net/mac80211.h>
Johannes Berg0a51b272008-09-08 17:44:25 +020023
24#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020025#include "driver-ops.h"
Johannes Berg5484e232008-09-08 17:44:27 +020026#include "mesh.h"
Johannes Berg0a51b272008-09-08 17:44:25 +020027
28#define IEEE80211_PROBE_DELAY (HZ / 33)
29#define IEEE80211_CHANNEL_TIME (HZ / 33)
Stanislaw Gruszka3f892b62013-01-23 12:32:45 +010030#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9)
Johannes Berg0a51b272008-09-08 17:44:25 +020031
Johannes Berg5484e232008-09-08 17:44:27 +020032void ieee80211_rx_bss_put(struct ieee80211_local *local,
Johannes Bergc2b13452008-09-11 00:01:55 +020033 struct ieee80211_bss *bss)
Johannes Berg5484e232008-09-08 17:44:27 +020034{
Johannes Berg0c1ad2c2009-12-23 13:15:39 +010035 if (!bss)
36 return;
Johannes Berg5b112d32013-02-01 01:49:58 +010037 cfg80211_put_bss(local->hw.wiphy,
38 container_of((void *)bss, struct cfg80211_bss, priv));
Johannes Berg5484e232008-09-08 17:44:27 +020039}
40
Kalle Valoab133152010-01-12 10:42:31 +020041static 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
Benjamin Berg108d20222023-06-16 09:54:01 +030058struct inform_bss_update_data {
59 struct ieee80211_rx_status *rx_status;
60 bool beacon;
61};
62
63void ieee80211_inform_bss(struct wiphy *wiphy,
64 struct cfg80211_bss *cbss,
65 const struct cfg80211_bss_ies *ies,
66 void *data)
Sara Sharonfcea7db2019-01-16 20:35:38 +020067{
Benjamin Berg108d20222023-06-16 09:54:01 +030068 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;
Sara Sharonfcea7db2019-01-16 20:35:38 +020073 int clen, srlen;
74
Benjamin Berg108d20222023-06-16 09:54:01 +030075 /* This happens while joining an IBSS */
76 if (!update_data)
77 return;
78
79 elems = ieee802_11_parse_elems(ies->data, ies->len, false, NULL);
80 if (!elems)
81 return;
82
83 rx_status = update_data->rx_status;
84
85 if (update_data->beacon)
Sara Sharonfcea7db2019-01-16 20:35:38 +020086 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) {
Benjamin Berg108d20222023-06-16 09:54:01 +030091 if (update_data->beacon)
Sara Sharonfcea7db2019-01-16 20:35:38 +020092 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
93 else
94 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
95 } else {
Benjamin Berg108d20222023-06-16 09:54:01 +030096 if (update_data->beacon)
Sara Sharonfcea7db2019-01-16 20:35:38 +020097 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
Benjamin Berg108d20222023-06-16 09:54:01 +0300145 if (update_data->beacon) {
Sara Sharonfcea7db2019-01-16 20:35:38 +0200146 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 }
Johannes Berg2a333a02020-05-28 21:34:35 +0200153
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;
Benjamin Berg108d20222023-06-16 09:54:01 +0300159
160 kfree(elems);
Sara Sharonfcea7db2019-01-16 20:35:38 +0200161}
162
Johannes Bergc2b13452008-09-11 00:01:55 +0200163struct ieee80211_bss *
Johannes Berg5484e232008-09-08 17:44:27 +0200164ieee80211_bss_info_update(struct ieee80211_local *local,
165 struct ieee80211_rx_status *rx_status,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +0200166 struct ieee80211_mgmt *mgmt, size_t len,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +0200167 struct ieee80211_channel *channel)
Johannes Berg5484e232008-09-08 17:44:27 +0200168{
Thomas Pedersencd418ba2020-09-21 19:28:08 -0700169 bool beacon = ieee80211_is_beacon(mgmt->frame_control) ||
170 ieee80211_is_s1g_beacon(mgmt->frame_control);
Benjamin Berg108d20222023-06-16 09:54:01 +0300171 struct cfg80211_bss *cbss;
172 struct inform_bss_update_data update_data = {
173 .rx_status = rx_status,
174 .beacon = beacon,
175 };
Johannes Berg162dd6a2016-02-23 23:05:06 +0200176 struct cfg80211_inform_bss bss_meta = {
177 .boottime_ns = rx_status->boottime_ns,
Benjamin Berg108d20222023-06-16 09:54:01 +0300178 .drv_data = (void *)&update_data,
Johannes Berg162dd6a2016-02-23 23:05:06 +0200179 };
Sara Sharon74d803b2015-06-03 10:44:17 +0300180 bool signal_valid;
Avraham Stern7947d3e2016-07-05 15:23:12 +0300181 struct ieee80211_sub_if_data *scan_sdata;
Johannes Berg2a519312009-02-10 21:25:55 +0100182
Tosoni1ad22fb2018-03-14 16:58:34 +0000183 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))
Johannes Berg61f6bba2015-10-13 11:36:21 +0200186 bss_meta.signal = rx_status->signal * 100;
Johannes Berg30686bf2015-06-02 21:39:54 +0200187 else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
Johannes Berg61f6bba2015-10-13 11:36:21 +0200188 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;
Johannes Berg2a519312009-02-10 21:25:55 +0100189
Johannes Berg61f6bba2015-10-13 11:36:21 +0200190 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20;
Johannes Bergda6a4352017-04-26 12:14:59 +0200191 if (rx_status->bw == RATE_INFO_BW_5)
Johannes Berg61f6bba2015-10-13 11:36:21 +0200192 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5;
Johannes Bergda6a4352017-04-26 12:14:59 +0200193 else if (rx_status->bw == RATE_INFO_BW_10)
Johannes Berg61f6bba2015-10-13 11:36:21 +0200194 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200195
Johannes Berg61f6bba2015-10-13 11:36:21 +0200196 bss_meta.chan = channel;
Avraham Stern7947d3e2016-07-05 15:23:12 +0300197
198 rcu_read_lock();
199 scan_sdata = rcu_dereference(local->scan_sdata);
200 if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
Johannes Bergf276e202022-05-10 17:05:04 +0200201 scan_sdata->vif.cfg.assoc &&
Avraham Stern7947d3e2016-07-05 15:23:12 +0300202 ieee80211_have_rx_timestamp(rx_status)) {
203 bss_meta.parent_tsf =
204 ieee80211_calculate_rx_timestamp(local, rx_status,
205 len + FCS_LEN, 24);
206 ether_addr_copy(bss_meta.parent_bssid,
207 scan_sdata->vif.bss_conf.bssid);
208 }
209 rcu_read_unlock();
210
Johannes Berg61f6bba2015-10-13 11:36:21 +0200211 cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
212 mgmt, len, GFP_ATOMIC);
Johannes Berg0c1ad2c2009-12-23 13:15:39 +0100213 if (!cbss)
Johannes Berg00d3f142009-02-10 21:26:00 +0100214 return NULL;
Sara Sharon4abb52a2019-01-16 12:14:41 +0200215
Sara Sharon74d803b2015-06-03 10:44:17 +0300216 /* In case the signal is invalid update the status */
Emmanuel Grumbach7bb106e2020-02-14 23:23:38 +0100217 signal_valid = channel == cbss->channel;
Sara Sharon74d803b2015-06-03 10:44:17 +0300218 if (!signal_valid)
219 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
Johannes Berg00d3f142009-02-10 21:26:00 +0100220
Benjamin Berg108d20222023-06-16 09:54:01 +0300221 return (void *)cbss->priv;
Johannes Berg5484e232008-09-08 17:44:27 +0200222}
Johannes Berg0a51b272008-09-08 17:44:25 +0200223
Roee Zamir40b0bd22017-08-06 11:38:23 +0300224static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata,
225 u32 scan_flags, const u8 *da)
226{
227 if (!sdata)
228 return false;
229 /* accept broadcast for OCE */
230 if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP &&
231 is_broadcast_ether_addr(da))
232 return true;
233 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
234 return true;
235 return ether_addr_equal(da, sdata->vif.addr);
236}
237
Johannes Bergd48b2962012-07-06 22:19:27 +0200238void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200239{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200240 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Bergd48b2962012-07-06 22:19:27 +0200241 struct ieee80211_sub_if_data *sdata1, *sdata2;
242 struct ieee80211_mgmt *mgmt = (void *)skb->data;
Johannes Bergc2b13452008-09-11 00:01:55 +0200243 struct ieee80211_bss *bss;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200244 struct ieee80211_channel *channel;
Du Chenge298aa32021-05-10 12:16:49 +0800245 size_t min_hdr_len = offsetof(struct ieee80211_mgmt,
246 u.probe_resp.variable);
247
248 if (!ieee80211_is_probe_resp(mgmt->frame_control) &&
249 !ieee80211_is_beacon(mgmt->frame_control) &&
250 !ieee80211_is_s1g_beacon(mgmt->frame_control))
251 return;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200252
Thomas Pedersencd418ba2020-09-21 19:28:08 -0700253 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
Du Chenge298aa32021-05-10 12:16:49 +0800254 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
255 min_hdr_len = offsetof(struct ieee80211_ext,
256 u.s1g_short_beacon.variable);
257 else
258 min_hdr_len = offsetof(struct ieee80211_ext,
259 u.s1g_beacon);
260 }
261
262 if (skb->len < min_hdr_len)
Johannes Bergd48b2962012-07-06 22:19:27 +0200263 return;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200264
Johannes Bergd48b2962012-07-06 22:19:27 +0200265 sdata1 = rcu_dereference(local->scan_sdata);
266 sdata2 = rcu_dereference(local->sched_scan_sdata);
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200267
Johannes Bergd48b2962012-07-06 22:19:27 +0200268 if (likely(!sdata1 && !sdata2))
269 return;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200270
Felix Fietkaub041b7b2022-04-20 12:49:07 +0200271 if (test_and_clear_bit(SCAN_BEACON_WAIT, &local->scanning)) {
272 /*
273 * we were passive scanning because of radar/no-IR, but
274 * the beacon/proberesp rx gives us an opportunity to upgrade
275 * to active scan
276 */
277 set_bit(SCAN_BEACON_DONE, &local->scanning);
278 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
279 }
280
Johannes Bergd48b2962012-07-06 22:19:27 +0200281 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
Johannes Berga344d672014-06-12 22:24:31 +0200282 struct cfg80211_scan_request *scan_req;
283 struct cfg80211_sched_scan_request *sched_scan_req;
Roee Zamir40b0bd22017-08-06 11:38:23 +0300284 u32 scan_req_flags = 0, sched_scan_req_flags = 0;
Johannes Berga344d672014-06-12 22:24:31 +0200285
286 scan_req = rcu_dereference(local->scan_req);
287 sched_scan_req = rcu_dereference(local->sched_scan_req);
288
Roee Zamir40b0bd22017-08-06 11:38:23 +0300289 if (scan_req)
290 scan_req_flags = scan_req->flags;
291
292 if (sched_scan_req)
293 sched_scan_req_flags = sched_scan_req->flags;
294
295 /* ignore ProbeResp to foreign address or non-bcast (OCE)
296 * unless scanning with randomised address
Johannes Berga344d672014-06-12 22:24:31 +0200297 */
Roee Zamir40b0bd22017-08-06 11:38:23 +0300298 if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags,
299 mgmt->da) &&
300 !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags,
301 mgmt->da))
Johannes Bergd48b2962012-07-06 22:19:27 +0200302 return;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200303 }
304
Thomas Pedersen3b23c1842020-04-01 18:18:05 -0700305 channel = ieee80211_get_channel_khz(local->hw.wiphy,
306 ieee80211_rx_status_to_khz(rx_status));
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200307
308 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
Johannes Bergd48b2962012-07-06 22:19:27 +0200309 return;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200310
Johannes Bergd48b2962012-07-06 22:19:27 +0200311 bss = ieee80211_bss_info_update(local, rx_status,
Sara Sharon4abb52a2019-01-16 12:14:41 +0200312 mgmt, skb->len,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +0200313 channel);
Jouni Malinend048e502008-10-11 03:29:55 +0300314 if (bss)
Johannes Bergd48b2962012-07-06 22:19:27 +0200315 ieee80211_rx_bss_put(local, bss);
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200316}
317
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200318static void
319ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef,
320 enum nl80211_bss_scan_width scan_width)
321{
322 memset(chandef, 0, sizeof(*chandef));
323 switch (scan_width) {
324 case NL80211_BSS_CHAN_WIDTH_5:
325 chandef->width = NL80211_CHAN_WIDTH_5;
326 break;
327 case NL80211_BSS_CHAN_WIDTH_10:
328 chandef->width = NL80211_CHAN_WIDTH_10;
329 break;
330 default:
331 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
332 break;
333 }
334}
335
Johannes Berg4d36ec52009-10-27 20:59:55 +0100336/* return false if no more work */
Ilan Peer2ad22742020-05-28 21:34:39 +0200337static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata)
Johannes Berg4d36ec52009-10-27 20:59:55 +0100338{
Ilan Peer2ad22742020-05-28 21:34:39 +0200339 struct ieee80211_local *local = sdata->local;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100340 struct cfg80211_scan_request *req;
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200341 struct cfg80211_chan_def chandef;
David Spinadelc56ef672014-02-05 15:21:13 +0200342 u8 bands_used = 0;
Johannes Berg4d36ec52009-10-27 20:59:55 +0100343 int i, ielen, n_chans;
Johannes Bergb9771d42018-05-28 15:47:41 +0200344 u32 flags = 0;
Johannes Berg4d36ec52009-10-27 20:59:55 +0100345
Johannes Berg6ea0a692014-11-19 11:55:49 +0100346 req = rcu_dereference_protected(local->scan_req,
347 lockdep_is_held(&local->mtx));
348
Emmanuel Grumbacha7540552013-09-16 11:12:07 +0300349 if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
350 return false;
351
Johannes Berg30686bf2015-06-02 21:39:54 +0200352 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
Johannes Berg4d36ec52009-10-27 20:59:55 +0100353 for (i = 0; i < req->n_channels; i++) {
David Spinadelc56ef672014-02-05 15:21:13 +0200354 local->hw_scan_req->req.channels[i] = req->channels[i];
355 bands_used |= BIT(req->channels[i]->band);
Johannes Berg4d36ec52009-10-27 20:59:55 +0100356 }
357
David Spinadelc56ef672014-02-05 15:21:13 +0200358 n_chans = req->n_channels;
359 } else {
360 do {
Johannes Berg57fbcce2016-04-12 15:56:15 +0200361 if (local->hw_scan_band == NUM_NL80211_BANDS)
David Spinadelc56ef672014-02-05 15:21:13 +0200362 return false;
Johannes Berg4d36ec52009-10-27 20:59:55 +0100363
David Spinadelc56ef672014-02-05 15:21:13 +0200364 n_chans = 0;
365
366 for (i = 0; i < req->n_channels; i++) {
367 if (req->channels[i]->band !=
368 local->hw_scan_band)
369 continue;
370 local->hw_scan_req->req.channels[n_chans] =
371 req->channels[i];
372 n_chans++;
373 bands_used |= BIT(req->channels[i]->band);
374 }
375
376 local->hw_scan_band++;
377 } while (!n_chans);
378 }
379
380 local->hw_scan_req->req.n_channels = n_chans;
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200381 ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
Johannes Berg4d36ec52009-10-27 20:59:55 +0100382
Johannes Bergb9771d42018-05-28 15:47:41 +0200383 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
384 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
385
Ilan Peer2ad22742020-05-28 21:34:39 +0200386 ielen = ieee80211_build_preq_ies(sdata,
David Spinadelc56ef672014-02-05 15:21:13 +0200387 (u8 *)local->hw_scan_req->req.ie,
Johannes Bergc604b9f2012-11-29 12:45:18 +0100388 local->hw_scan_ies_bufsize,
David Spinadelc56ef672014-02-05 15:21:13 +0200389 &local->hw_scan_req->ies,
390 req->ie, req->ie_len,
Johannes Bergb9771d42018-05-28 15:47:41 +0200391 bands_used, req->rates, &chandef,
392 flags);
David Spinadelc56ef672014-02-05 15:21:13 +0200393 local->hw_scan_req->req.ie_len = ielen;
394 local->hw_scan_req->req.no_cck = req->no_cck;
Johannes Berga344d672014-06-12 22:24:31 +0200395 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
396 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
397 req->mac_addr_mask);
Jouni Malinene345f442016-02-26 22:12:48 +0200398 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
Johannes Berg4d36ec52009-10-27 20:59:55 +0100399
400 return true;
401}
402
Eliad Peller8bd2a242013-12-05 11:21:27 +0200403static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
Johannes Berg0a51b272008-09-08 17:44:25 +0200404{
405 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berge9da68d2018-10-18 10:35:47 +0200406 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
Eliad Pellera2b70e82013-12-05 11:21:28 +0200407 bool was_scanning = local->scanning;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100408 struct cfg80211_scan_request *scan_req;
Johannes Berga344d672014-06-12 22:24:31 +0200409 struct ieee80211_sub_if_data *scan_sdata;
Sachin Kulkarni4fa11ec2016-01-12 14:30:19 +0530410 struct ieee80211_sub_if_data *sdata;
Johannes Berg0a51b272008-09-08 17:44:25 +0200411
Stanislaw Gruszkae229f842010-10-06 11:22:09 +0200412 lockdep_assert_held(&local->mtx);
Johannes Bergf3b852522009-04-23 16:01:47 +0200413
Johannes Berg6d3560d2009-10-31 07:44:08 +0100414 /*
415 * It's ok to abort a not-yet-running scan (that
416 * we have one at all will be verified by checking
417 * local->scan_req next), but not to complete it
418 * successfully.
419 */
420 if (WARN_ON(!local->scanning && !aborted))
421 aborted = true;
Johannes Bergde95a54b2009-04-01 11:58:36 +0200422
Stanislaw Gruszkae229f842010-10-06 11:22:09 +0200423 if (WARN_ON(!local->scan_req))
Johannes Bergd07bfd82011-03-07 15:48:41 +0100424 return;
Johannes Bergf3b852522009-04-23 16:01:47 +0200425
Ilan Peer2ad22742020-05-28 21:34:39 +0200426 scan_sdata = rcu_dereference_protected(local->scan_sdata,
427 lockdep_is_held(&local->mtx));
428
David Spinadelc56ef672014-02-05 15:21:13 +0200429 if (hw_scan && !aborted &&
Johannes Berg30686bf2015-06-02 21:39:54 +0200430 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
Ilan Peer2ad22742020-05-28 21:34:39 +0200431 ieee80211_prep_hw_scan(scan_sdata)) {
Johannes Berge2fd5db2012-07-06 21:39:28 +0200432 int rc;
433
434 rc = drv_hw_scan(local,
435 rcu_dereference_protected(local->scan_sdata,
436 lockdep_is_held(&local->mtx)),
437 local->hw_scan_req);
438
Stanislaw Gruszka6eb11a92010-10-06 11:22:11 +0200439 if (rc == 0)
Johannes Bergd07bfd82011-03-07 15:48:41 +0100440 return;
Avraham Stern7947d3e2016-07-05 15:23:12 +0300441
Johannes Berg7d10f6b2016-07-05 15:23:13 +0300442 /* HW scan failed and is going to be reported as aborted,
443 * so clear old scan info.
Avraham Stern7947d3e2016-07-05 15:23:12 +0300444 */
445 memset(&local->scan_info, 0, sizeof(local->scan_info));
Johannes Berg7d10f6b2016-07-05 15:23:13 +0300446 aborted = true;
Johannes Berg4d36ec52009-10-27 20:59:55 +0100447 }
448
449 kfree(local->hw_scan_req);
450 local->hw_scan_req = NULL;
Johannes Bergf3b852522009-04-23 16:01:47 +0200451
Johannes Berg6ea0a692014-11-19 11:55:49 +0100452 scan_req = rcu_dereference_protected(local->scan_req,
453 lockdep_is_held(&local->mtx));
454
Johannes Berg6ea0a692014-11-19 11:55:49 +0100455 RCU_INIT_POINTER(local->scan_req, NULL);
Monam Agarwal0c2bef462014-03-24 00:51:43 +0530456 RCU_INIT_POINTER(local->scan_sdata, NULL);
Johannes Berg2a519312009-02-10 21:25:55 +0100457
Helmut Schaafbe9c4292009-07-23 12:14:04 +0200458 local->scanning = 0;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200459 local->scan_chandef.chan = NULL;
Johannes Bergf3b852522009-04-23 16:01:47 +0200460
Siddh Raman Pant60deb9f2022-08-20 01:33:40 +0530461 synchronize_rcu();
462
463 if (scan_req != local->int_scan_req) {
464 local->scan_info.aborted = aborted;
465 cfg80211_scan_done(scan_req, &local->scan_info);
466 }
467
Johannes Berg07ef03e2011-11-08 16:21:21 +0100468 /* Set power back to normal operating levels. */
469 ieee80211_hw_config(local, 0);
Ben Greearb23b0252011-02-04 11:54:17 -0800470
Johannes Berga033afc2022-09-02 16:12:55 +0200471 if (!hw_scan && was_scanning) {
Ben Greearb23b0252011-02-04 11:54:17 -0800472 ieee80211_configure_filter(local);
Johannes Berga344d672014-06-12 22:24:31 +0200473 drv_sw_scan_complete(local, scan_sdata);
Stanislaw Gruszkaaacde9e2012-12-20 14:41:18 +0100474 ieee80211_offchannel_return(local);
Ben Greearb23b0252011-02-04 11:54:17 -0800475 }
476
Johannes Berg5cff20e2009-04-29 12:26:17 +0200477 ieee80211_recalc_idle(local);
Stanislaw Gruszkae229f842010-10-06 11:22:09 +0200478
Johannes Berg0a51b272008-09-08 17:44:25 +0200479 ieee80211_mlme_notify_scan_completed(local);
Johannes Berg46900292009-02-15 12:44:28 +0100480 ieee80211_ibss_notify_scan_completed(local);
Sachin Kulkarni4fa11ec2016-01-12 14:30:19 +0530481
482 /* Requeue all the work that might have been ignored while
483 * the scan was in progress; if there was none this will
484 * just be a no-op for the particular interface.
485 */
486 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
487 if (ieee80211_sdata_running(sdata))
Johannes Berg16114492023-06-06 14:49:26 +0200488 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
Sachin Kulkarni4fa11ec2016-01-12 14:30:19 +0530489 }
490
Eliad Pellera2b70e82013-12-05 11:21:28 +0200491 if (was_scanning)
492 ieee80211_start_next_roc(local);
Johannes Berg0a51b272008-09-08 17:44:25 +0200493}
Johannes Berg8789d452010-08-26 13:30:26 +0200494
Avraham Stern7947d3e2016-07-05 15:23:12 +0300495void ieee80211_scan_completed(struct ieee80211_hw *hw,
496 struct cfg80211_scan_info *info)
Johannes Berg8789d452010-08-26 13:30:26 +0200497{
498 struct ieee80211_local *local = hw_to_local(hw);
499
Johannes Berg58bd7f12016-09-14 09:37:54 +0200500 trace_api_scan_completed(local, info->aborted);
Johannes Berg8789d452010-08-26 13:30:26 +0200501
502 set_bit(SCAN_COMPLETED, &local->scanning);
Avraham Stern7947d3e2016-07-05 15:23:12 +0300503 if (info->aborted)
Johannes Berg8789d452010-08-26 13:30:26 +0200504 set_bit(SCAN_ABORTED, &local->scanning);
Avraham Stern7947d3e2016-07-05 15:23:12 +0300505
506 memcpy(&local->scan_info, info, sizeof(*info));
507
Johannes Berg8789d452010-08-26 13:30:26 +0200508 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
509}
Johannes Berg0a51b272008-09-08 17:44:25 +0200510EXPORT_SYMBOL(ieee80211_scan_completed);
511
Johannes Berga344d672014-06-12 22:24:31 +0200512static int ieee80211_start_sw_scan(struct ieee80211_local *local,
513 struct ieee80211_sub_if_data *sdata)
Johannes Bergf3b852522009-04-23 16:01:47 +0200514{
Johannes Bergfe57d9f2012-07-26 14:55:08 +0200515 /* Software scan is not supported in multi-channel cases */
516 if (local->use_chanctx)
517 return -EOPNOTSUPP;
518
Johannes Bergf3b852522009-04-23 16:01:47 +0200519 /*
520 * Hardware/driver doesn't support hw_scan, so use software
521 * scanning instead. First send a nullfunc frame with power save
522 * bit on so that AP will buffer the frames for us while we are not
523 * listening, then send probe requests to each channel and wait for
524 * the responses. After all channels are scanned, tune back to the
525 * original channel and send a nullfunc frame with power save bit
526 * off to trigger the AP to send us all the buffered frames.
527 *
528 * Note that while local->sw_scanning is true everything else but
529 * nullfunc frames and probe requests will be dropped in
530 * ieee80211_tx_h_check_assoc().
531 */
Johannes Berga344d672014-06-12 22:24:31 +0200532 drv_sw_scan_start(local, sdata, local->scan_addr);
Johannes Bergf3b852522009-04-23 16:01:47 +0200533
Rajkumar Manoharande312db2012-03-27 11:01:06 +0530534 local->leave_oper_channel_time = jiffies;
Helmut Schaa977923b2009-07-23 12:14:20 +0200535 local->next_scan_state = SCAN_DECISION;
Johannes Bergf3b852522009-04-23 16:01:47 +0200536 local->scan_channel_idx = 0;
537
Stanislaw Gruszkaaacde9e2012-12-20 14:41:18 +0100538 ieee80211_offchannel_stop_vifs(local);
Johannes Berga80f7c02009-12-23 13:15:32 +0100539
Seth Forshee9c35d7d2013-02-11 11:21:08 -0600540 /* ensure nullfunc is transmitted before leaving operating channel */
Emmanuel Grumbach3b24f4c2015-01-07 15:42:39 +0200541 ieee80211_flush_queues(local, NULL, false);
Seth Forshee9c35d7d2013-02-11 11:21:08 -0600542
Johannes Berg3ac64be2009-08-17 16:16:53 +0200543 ieee80211_configure_filter(local);
Johannes Bergf3b852522009-04-23 16:01:47 +0200544
Ben Greear59bdf3b2011-02-07 13:44:38 -0800545 /* We need to set power level at maximum rate for scanning. */
546 ieee80211_hw_config(local, 0);
547
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -0400548 ieee80211_queue_delayed_work(&local->hw,
Johannes Berg07ef03e2011-11-08 16:21:21 +0100549 &local->scan_work, 0);
Johannes Bergf3b852522009-04-23 16:01:47 +0200550
551 return 0;
552}
553
Aaron Komisardc0c18e2019-10-02 13:59:07 +0000554static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata)
555{
556 struct ieee80211_local *local = sdata->local;
557 struct ieee80211_sub_if_data *sdata_iter;
558
559 if (!ieee80211_is_radar_required(local))
560 return true;
561
562 if (!regulatory_pre_cac_allowed(local->hw.wiphy))
563 return false;
564
565 mutex_lock(&local->iflist_mtx);
566 list_for_each_entry(sdata_iter, &local->interfaces, list) {
567 if (sdata_iter->wdev.cac_started) {
568 mutex_unlock(&local->iflist_mtx);
569 return false;
570 }
571 }
572 mutex_unlock(&local->iflist_mtx);
573
574 return true;
575}
576
Stanislaw Gruszka133d40f2012-03-28 16:01:19 +0200577static bool ieee80211_can_scan(struct ieee80211_local *local,
578 struct ieee80211_sub_if_data *sdata)
579{
Aaron Komisardc0c18e2019-10-02 13:59:07 +0000580 if (!__ieee80211_can_leave_ch(sdata))
Simon Wunderlich164eb022013-02-08 18:16:20 +0100581 return false;
582
Johannes Berg2eb278e2012-06-05 14:28:42 +0200583 if (!list_empty(&local->roc_list))
Stanislaw Gruszka133d40f2012-03-28 16:01:19 +0200584 return false;
585
586 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
Stanislaw Gruszka392b9ff2013-08-27 11:36:35 +0200587 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
Stanislaw Gruszka133d40f2012-03-28 16:01:19 +0200588 return false;
589
590 return true;
591}
592
593void ieee80211_run_deferred_scan(struct ieee80211_local *local)
594{
595 lockdep_assert_held(&local->mtx);
596
597 if (!local->scan_req || local->scanning)
598 return;
599
Johannes Berge2fd5db2012-07-06 21:39:28 +0200600 if (!ieee80211_can_scan(local,
601 rcu_dereference_protected(
602 local->scan_sdata,
603 lockdep_is_held(&local->mtx))))
Stanislaw Gruszka133d40f2012-03-28 16:01:19 +0200604 return;
605
606 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
607 round_jiffies_relative(0));
608}
Johannes Bergf3b852522009-04-23 16:01:47 +0200609
Johannes Berg45ad6832018-05-28 15:47:39 +0200610static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
611 const u8 *src, const u8 *dst,
612 const u8 *ssid, size_t ssid_len,
613 const u8 *ie, size_t ie_len,
614 u32 ratemask, u32 flags, u32 tx_flags,
615 struct ieee80211_channel *channel)
616{
617 struct sk_buff *skb;
618
619 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
620 ssid, ssid_len,
621 ie, ie_len, flags);
Johannes Bergb9771d42018-05-28 15:47:41 +0200622
Johannes Berg45ad6832018-05-28 15:47:39 +0200623 if (skb) {
Johannes Bergb9771d42018-05-28 15:47:41 +0200624 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) {
625 struct ieee80211_hdr *hdr = (void *)skb->data;
Mathy Vanhoef2b3dab12020-07-23 14:01:51 +0400626 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Jason A. Donenfeld7e3cf082022-10-05 17:23:53 +0200627 u16 sn = get_random_u16();
Johannes Bergb9771d42018-05-28 15:47:41 +0200628
Mathy Vanhoef2b3dab12020-07-23 14:01:51 +0400629 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
Johannes Bergb9771d42018-05-28 15:47:41 +0200630 hdr->seq_ctrl =
631 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn));
632 }
Johannes Berg45ad6832018-05-28 15:47:39 +0200633 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
Mathy Vanhoef08aca292020-07-23 14:01:52 +0400634 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
Johannes Berg45ad6832018-05-28 15:47:39 +0200635 }
636}
637
Ben Greear8a690672012-04-17 10:54:16 -0700638static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
639 unsigned long *next_delay)
640{
641 int i;
Johannes Berge2fd5db2012-07-06 21:39:28 +0200642 struct ieee80211_sub_if_data *sdata;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100643 struct cfg80211_scan_request *scan_req;
Johannes Berg57fbcce2016-04-12 15:56:15 +0200644 enum nl80211_band band = local->hw.conf.chandef.chan->band;
Johannes Bergb9771d42018-05-28 15:47:41 +0200645 u32 flags = 0, tx_flags;
Seth Forshee6c17b772013-02-11 11:21:07 -0600646
Johannes Berg6ea0a692014-11-19 11:55:49 +0100647 scan_req = rcu_dereference_protected(local->scan_req,
648 lockdep_is_held(&local->mtx));
649
Seth Forshee6c17b772013-02-11 11:21:07 -0600650 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100651 if (scan_req->no_cck)
Seth Forshee6c17b772013-02-11 11:21:07 -0600652 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
Johannes Bergb9771d42018-05-28 15:47:41 +0200653 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
654 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
655 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN)
656 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN;
Ben Greear8a690672012-04-17 10:54:16 -0700657
Johannes Berge2fd5db2012-07-06 21:39:28 +0200658 sdata = rcu_dereference_protected(local->scan_sdata,
Peter Senna Tschudin316b6b52012-09-06 18:09:16 +0200659 lockdep_is_held(&local->mtx));
Johannes Berge2fd5db2012-07-06 21:39:28 +0200660
Johannes Berg6ea0a692014-11-19 11:55:49 +0100661 for (i = 0; i < scan_req->n_ssids; i++)
Johannes Berg45ad6832018-05-28 15:47:39 +0200662 ieee80211_send_scan_probe_req(
Jouni Malinene345f442016-02-26 22:12:48 +0200663 sdata, local->scan_addr, scan_req->bssid,
Johannes Berg6ea0a692014-11-19 11:55:49 +0100664 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
665 scan_req->ie, scan_req->ie_len,
Johannes Bergb9771d42018-05-28 15:47:41 +0200666 scan_req->rates[band], flags,
Johannes Berg45ad6832018-05-28 15:47:39 +0200667 tx_flags, local->hw.conf.chandef.chan);
Ben Greear8a690672012-04-17 10:54:16 -0700668
669 /*
670 * After sending probe requests, wait for probe responses
671 * on the channel.
672 */
673 *next_delay = IEEE80211_CHANNEL_TIME;
674 local->next_scan_state = SCAN_DECISION;
675}
676
Johannes Bergf3b852522009-04-23 16:01:47 +0200677static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
678 struct cfg80211_scan_request *req)
679{
680 struct ieee80211_local *local = sdata->local;
Johannes Berge9da68d2018-10-18 10:35:47 +0200681 bool hw_scan = local->ops->hw_scan;
Johannes Bergf3b852522009-04-23 16:01:47 +0200682 int rc;
683
Stanislaw Gruszkae229f842010-10-06 11:22:09 +0200684 lockdep_assert_held(&local->mtx);
685
Aaron Komisardc0c18e2019-10-02 13:59:07 +0000686 if (local->scan_req)
687 return -EBUSY;
688
689 if (!__ieee80211_can_leave_ch(sdata))
Johannes Bergf3b852522009-04-23 16:01:47 +0200690 return -EBUSY;
691
Stanislaw Gruszka133d40f2012-03-28 16:01:19 +0200692 if (!ieee80211_can_scan(local, sdata)) {
John W. Linville6e7e6212010-02-08 16:38:38 -0500693 /* wait for the work to finish/time out */
Johannes Berg6ea0a692014-11-19 11:55:49 +0100694 rcu_assign_pointer(local->scan_req, req);
Johannes Berge2fd5db2012-07-06 21:39:28 +0200695 rcu_assign_pointer(local->scan_sdata, sdata);
Johannes Bergc0ce77b2010-02-03 10:22:31 +0100696 return 0;
697 }
698
Johannes Berge9da68d2018-10-18 10:35:47 +0200699 again:
700 if (hw_scan) {
Johannes Bergf3b852522009-04-23 16:01:47 +0200701 u8 *ies;
Johannes Bergf3b852522009-04-23 16:01:47 +0200702
David Spinadele4dcbb32014-02-11 13:45:41 +0200703 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
David Spinadelc56ef672014-02-05 15:21:13 +0200704
Johannes Berg30686bf2015-06-02 21:39:54 +0200705 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
David Spinadelc56ef672014-02-05 15:21:13 +0200706 int i, n_bands = 0;
707 u8 bands_counted = 0;
708
709 for (i = 0; i < req->n_channels; i++) {
710 if (bands_counted & BIT(req->channels[i]->band))
711 continue;
712 bands_counted |= BIT(req->channels[i]->band);
713 n_bands++;
714 }
715
716 local->hw_scan_ies_bufsize *= n_bands;
717 }
718
Johannes Berg4d36ec52009-10-27 20:59:55 +0100719 local->hw_scan_req = kmalloc(
720 sizeof(*local->hw_scan_req) +
721 req->n_channels * sizeof(req->channels[0]) +
Johannes Bergc604b9f2012-11-29 12:45:18 +0100722 local->hw_scan_ies_bufsize, GFP_KERNEL);
Johannes Berg4d36ec52009-10-27 20:59:55 +0100723 if (!local->hw_scan_req)
Johannes Bergf3b852522009-04-23 16:01:47 +0200724 return -ENOMEM;
725
David Spinadelc56ef672014-02-05 15:21:13 +0200726 local->hw_scan_req->req.ssids = req->ssids;
727 local->hw_scan_req->req.n_ssids = req->n_ssids;
Johannes Berg4d36ec52009-10-27 20:59:55 +0100728 ies = (u8 *)local->hw_scan_req +
729 sizeof(*local->hw_scan_req) +
730 req->n_channels * sizeof(req->channels[0]);
David Spinadelc56ef672014-02-05 15:21:13 +0200731 local->hw_scan_req->req.ie = ies;
732 local->hw_scan_req->req.flags = req->flags;
Jouni Malinene345f442016-02-26 22:12:48 +0200733 eth_broadcast_addr(local->hw_scan_req->req.bssid);
Avraham Stern7947d3e2016-07-05 15:23:12 +0300734 local->hw_scan_req->req.duration = req->duration;
735 local->hw_scan_req->req.duration_mandatory =
736 req->duration_mandatory;
Johannes Berg4d36ec52009-10-27 20:59:55 +0100737
738 local->hw_scan_band = 0;
Tova Mussaic8cb5b82020-09-18 11:33:13 +0200739 local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params;
740 local->hw_scan_req->req.scan_6ghz_params =
741 req->scan_6ghz_params;
742 local->hw_scan_req->req.scan_6ghz = req->scan_6ghz;
John W. Linville6e7e6212010-02-08 16:38:38 -0500743
744 /*
745 * After allocating local->hw_scan_req, we must
746 * go through until ieee80211_prep_hw_scan(), so
747 * anything that might be changed here and leave
748 * this function early must not go after this
749 * allocation.
750 */
Johannes Bergf3b852522009-04-23 16:01:47 +0200751 }
752
Johannes Berg6ea0a692014-11-19 11:55:49 +0100753 rcu_assign_pointer(local->scan_req, req);
Johannes Berge2fd5db2012-07-06 21:39:28 +0200754 rcu_assign_pointer(local->scan_sdata, sdata);
Johannes Bergf3b852522009-04-23 16:01:47 +0200755
Johannes Berga344d672014-06-12 22:24:31 +0200756 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
757 get_random_mask_addr(local->scan_addr,
758 req->mac_addr,
759 req->mac_addr_mask);
760 else
761 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
762
Johannes Berge9da68d2018-10-18 10:35:47 +0200763 if (hw_scan) {
Helmut Schaafbe9c4292009-07-23 12:14:04 +0200764 __set_bit(SCAN_HW_SCANNING, &local->scanning);
Ben Greear8a690672012-04-17 10:54:16 -0700765 } else if ((req->n_channels == 1) &&
Karl Beldan675a0b02013-03-25 16:26:57 +0100766 (req->channels[0] == local->_oper_chandef.chan)) {
Johannes Berg9b864872012-07-26 14:38:32 +0200767 /*
768 * If we are scanning only on the operating channel
769 * then we do not need to stop normal activities
Ben Greear8a690672012-04-17 10:54:16 -0700770 */
771 unsigned long next_delay;
772
773 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
774
775 ieee80211_recalc_idle(local);
776
777 /* Notify driver scan is starting, keep order of operations
778 * same as normal software scan, in case that matters. */
Johannes Berga344d672014-06-12 22:24:31 +0200779 drv_sw_scan_start(local, sdata, local->scan_addr);
Ben Greear8a690672012-04-17 10:54:16 -0700780
781 ieee80211_configure_filter(local); /* accept probe-responses */
782
783 /* We need to ensure power level is at max for scanning. */
784 ieee80211_hw_config(local, 0);
785
Antonio Quartulli4e39cca2015-11-21 18:13:40 +0800786 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
787 IEEE80211_CHAN_RADAR)) ||
Johannes Berg6ea0a692014-11-19 11:55:49 +0100788 !req->n_ssids) {
Ben Greear8a690672012-04-17 10:54:16 -0700789 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
Felix Fietkaub041b7b2022-04-20 12:49:07 +0200790 if (req->n_ssids)
791 set_bit(SCAN_BEACON_WAIT, &local->scanning);
Ben Greear8a690672012-04-17 10:54:16 -0700792 } else {
793 ieee80211_scan_state_send_probe(local, &next_delay);
794 next_delay = IEEE80211_CHANNEL_TIME;
795 }
796
797 /* Now, just wait a bit and we are all done! */
798 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
799 next_delay);
800 return 0;
801 } else {
802 /* Do normal software scan */
Helmut Schaafbe9c4292009-07-23 12:14:04 +0200803 __set_bit(SCAN_SW_SCANNING, &local->scanning);
Ben Greear8a690672012-04-17 10:54:16 -0700804 }
John W. Linville6e7e6212010-02-08 16:38:38 -0500805
Johannes Berg5cff20e2009-04-29 12:26:17 +0200806 ieee80211_recalc_idle(local);
Johannes Bergf3b852522009-04-23 16:01:47 +0200807
Johannes Berge9da68d2018-10-18 10:35:47 +0200808 if (hw_scan) {
Ilan Peer2ad22742020-05-28 21:34:39 +0200809 WARN_ON(!ieee80211_prep_hw_scan(sdata));
Johannes Berga060bbf2010-04-27 11:59:34 +0200810 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
Johannes Berga344d672014-06-12 22:24:31 +0200811 } else {
812 rc = ieee80211_start_sw_scan(local, sdata);
813 }
Johannes Bergf3b852522009-04-23 16:01:47 +0200814
Johannes Bergf3b852522009-04-23 16:01:47 +0200815 if (rc) {
Johannes Berg4d36ec52009-10-27 20:59:55 +0100816 kfree(local->hw_scan_req);
817 local->hw_scan_req = NULL;
Helmut Schaafbe9c4292009-07-23 12:14:04 +0200818 local->scanning = 0;
Johannes Bergf3b852522009-04-23 16:01:47 +0200819
Johannes Berg5cff20e2009-04-29 12:26:17 +0200820 ieee80211_recalc_idle(local);
821
Johannes Bergf3b852522009-04-23 16:01:47 +0200822 local->scan_req = NULL;
Monam Agarwal0c2bef462014-03-24 00:51:43 +0530823 RCU_INIT_POINTER(local->scan_sdata, NULL);
Johannes Bergf3b852522009-04-23 16:01:47 +0200824 }
825
Johannes Berge9da68d2018-10-18 10:35:47 +0200826 if (hw_scan && rc == 1) {
827 /*
828 * we can't fall back to software for P2P-GO
829 * as it must update NoA etc.
830 */
831 if (ieee80211_vif_type_p2p(&sdata->vif) ==
832 NL80211_IFTYPE_P2P_GO)
833 return -EOPNOTSUPP;
834 hw_scan = false;
835 goto again;
836 }
837
Johannes Bergf3b852522009-04-23 16:01:47 +0200838 return rc;
839}
840
Helmut Schaadf13cce2010-02-24 14:19:21 +0100841static unsigned long
842ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
843{
844 /*
845 * TODO: channel switching also consumes quite some time,
846 * add that delay as well to get a better estimation
847 */
Antonio Quartulli4e39cca2015-11-21 18:13:40 +0800848 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
Helmut Schaadf13cce2010-02-24 14:19:21 +0100849 return IEEE80211_PASSIVE_CHANNEL_TIME;
850 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
851}
852
Stanislaw Gruszkae229f842010-10-06 11:22:09 +0200853static void ieee80211_scan_state_decision(struct ieee80211_local *local,
854 unsigned long *next_delay)
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200855{
Helmut Schaa142b9f52009-07-23 13:18:01 +0200856 bool associated = false;
Helmut Schaadf13cce2010-02-24 14:19:21 +0100857 bool tx_empty = true;
858 bool bad_latency;
Helmut Schaa142b9f52009-07-23 13:18:01 +0200859 struct ieee80211_sub_if_data *sdata;
Helmut Schaadf13cce2010-02-24 14:19:21 +0100860 struct ieee80211_channel *next_chan;
Sam Lefflercd2bb512012-10-11 21:03:35 -0700861 enum mac80211_scan_state next_scan_state;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100862 struct cfg80211_scan_request *scan_req;
Helmut Schaa142b9f52009-07-23 13:18:01 +0200863
Helmut Schaadf13cce2010-02-24 14:19:21 +0100864 /*
865 * check if at least one STA interface is associated,
866 * check if at least one STA interface has pending tx frames
867 * and grab the lowest used beacon interval
868 */
Helmut Schaa142b9f52009-07-23 13:18:01 +0200869 mutex_lock(&local->iflist_mtx);
870 list_for_each_entry(sdata, &local->interfaces, list) {
Johannes Berg9607e6b662009-12-23 13:15:31 +0100871 if (!ieee80211_sdata_running(sdata))
Helmut Schaa142b9f52009-07-23 13:18:01 +0200872 continue;
873
874 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
875 if (sdata->u.mgd.associated) {
876 associated = true;
Helmut Schaadf13cce2010-02-24 14:19:21 +0100877
Helmut Schaadf13cce2010-02-24 14:19:21 +0100878 if (!qdisc_all_tx_empty(sdata->dev)) {
879 tx_empty = false;
880 break;
881 }
Helmut Schaa142b9f52009-07-23 13:18:01 +0200882 }
883 }
884 }
885 mutex_unlock(&local->iflist_mtx);
886
Johannes Berg6ea0a692014-11-19 11:55:49 +0100887 scan_req = rcu_dereference_protected(local->scan_req,
888 lockdep_is_held(&local->mtx));
889
890 next_chan = scan_req->channels[local->scan_channel_idx];
Ben Greearb23b0252011-02-04 11:54:17 -0800891
Johannes Berg07ef03e2011-11-08 16:21:21 +0100892 /*
893 * we're currently scanning a different channel, let's
894 * see if we can scan another channel without interfering
895 * with the current traffic situation.
896 *
Stanislaw Gruszka3f892b62013-01-23 12:32:45 +0100897 * Keep good latency, do not stay off-channel more than 125 ms.
Johannes Berg07ef03e2011-11-08 16:21:21 +0100898 */
Helmut Schaadf13cce2010-02-24 14:19:21 +0100899
Johannes Berg07ef03e2011-11-08 16:21:21 +0100900 bad_latency = time_after(jiffies +
Stanislaw Gruszka3f892b62013-01-23 12:32:45 +0100901 ieee80211_scan_get_channel_time(next_chan),
902 local->leave_oper_channel_time + HZ / 8);
Helmut Schaadf13cce2010-02-24 14:19:21 +0100903
Sam Lefflercd2bb512012-10-11 21:03:35 -0700904 if (associated && !tx_empty) {
Johannes Berg6ea0a692014-11-19 11:55:49 +0100905 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
Sam Lefflercd2bb512012-10-11 21:03:35 -0700906 next_scan_state = SCAN_ABORT;
907 else
908 next_scan_state = SCAN_SUSPEND;
Stanislaw Gruszka3f892b62013-01-23 12:32:45 +0100909 } else if (associated && bad_latency) {
Sam Lefflercd2bb512012-10-11 21:03:35 -0700910 next_scan_state = SCAN_SUSPEND;
911 } else {
912 next_scan_state = SCAN_SET_CHANNEL;
913 }
914
915 local->next_scan_state = next_scan_state;
Helmut Schaa142b9f52009-07-23 13:18:01 +0200916
Helmut Schaa2fb3f022009-07-23 12:13:56 +0200917 *next_delay = 0;
Helmut Schaa2fb3f022009-07-23 12:13:56 +0200918}
919
920static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
921 unsigned long *next_delay)
922{
923 int skip;
924 struct ieee80211_channel *chan;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200925 enum nl80211_bss_scan_width oper_scan_width;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100926 struct cfg80211_scan_request *scan_req;
927
928 scan_req = rcu_dereference_protected(local->scan_req,
929 lockdep_is_held(&local->mtx));
Helmut Schaa2fb3f022009-07-23 12:13:56 +0200930
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200931 skip = 0;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100932 chan = scan_req->channels[local->scan_channel_idx];
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200933
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200934 local->scan_chandef.chan = chan;
935 local->scan_chandef.center_freq1 = chan->center_freq;
Thomas Pedersenb60119602020-04-01 18:18:04 -0700936 local->scan_chandef.freq1_offset = chan->freq_offset;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200937 local->scan_chandef.center_freq2 = 0;
Thomas Pedersen75b15932020-09-21 19:28:03 -0700938
939 /* For scanning on the S1G band, ignore scan_width (which is constant
940 * across all channels) for now since channel width is specific to each
941 * channel. Detect the required channel width here and likely revisit
942 * later. Maybe scan_width could be used to build the channel scan list?
943 */
944 if (chan->band == NL80211_BAND_S1GHZ) {
945 local->scan_chandef.width = ieee80211_s1g_channel_width(chan);
946 goto set_channel;
947 }
948
Johannes Berg6ea0a692014-11-19 11:55:49 +0100949 switch (scan_req->scan_width) {
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200950 case NL80211_BSS_CHAN_WIDTH_5:
951 local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
952 break;
953 case NL80211_BSS_CHAN_WIDTH_10:
954 local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
955 break;
Thomas Pedersendf78a0c2020-06-01 23:22:47 -0700956 default:
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200957 case NL80211_BSS_CHAN_WIDTH_20:
958 /* If scanning on oper channel, use whatever channel-type
959 * is currently in use.
960 */
961 oper_scan_width = cfg80211_chandef_to_scan_width(
962 &local->_oper_chandef);
963 if (chan == local->_oper_chandef.chan &&
Johannes Berg6ea0a692014-11-19 11:55:49 +0100964 oper_scan_width == scan_req->scan_width)
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200965 local->scan_chandef = local->_oper_chandef;
966 else
967 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
968 break;
Thomas Pedersen75b15932020-09-21 19:28:03 -0700969 case NL80211_BSS_CHAN_WIDTH_1:
970 case NL80211_BSS_CHAN_WIDTH_2:
971 /* shouldn't get here, S1G handled above */
972 WARN_ON(1);
973 break;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200974 }
Ben Greearb23b0252011-02-04 11:54:17 -0800975
Thomas Pedersen75b15932020-09-21 19:28:03 -0700976set_channel:
Johannes Berg07ef03e2011-11-08 16:21:21 +0100977 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
978 skip = 1;
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200979
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200980 /* advance state machine to next channel/band */
981 local->scan_channel_idx++;
982
Helmut Schaa0ee9c132009-07-25 17:25:51 +0200983 if (skip) {
984 /* if we skip this channel return to the decision state */
985 local->next_scan_state = SCAN_DECISION;
Helmut Schaa2fb3f022009-07-23 12:13:56 +0200986 return;
Helmut Schaa0ee9c132009-07-25 17:25:51 +0200987 }
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200988
989 /*
990 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
991 * (which unfortunately doesn't say _why_ step a) is done,
992 * but it waits for the probe delay or until a frame is
993 * received - and the received frame would update the NAV).
994 * For now, we do not support waiting until a frame is
995 * received.
996 *
997 * In any case, it is not necessary for a passive scan.
998 */
Antonio Quartulli4e39cca2015-11-21 18:13:40 +0800999 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
1000 !scan_req->n_ssids) {
Helmut Schaa7d3be3c2009-07-23 12:13:41 +02001001 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
Helmut Schaa977923b2009-07-23 12:14:20 +02001002 local->next_scan_state = SCAN_DECISION;
Felix Fietkaub041b7b2022-04-20 12:49:07 +02001003 if (scan_req->n_ssids)
1004 set_bit(SCAN_BEACON_WAIT, &local->scanning);
Helmut Schaa2fb3f022009-07-23 12:13:56 +02001005 return;
Helmut Schaa7d3be3c2009-07-23 12:13:41 +02001006 }
1007
Helmut Schaa2fb3f022009-07-23 12:13:56 +02001008 /* active scan, send probes */
Helmut Schaa7d3be3c2009-07-23 12:13:41 +02001009 *next_delay = IEEE80211_PROBE_DELAY;
Helmut Schaa977923b2009-07-23 12:14:20 +02001010 local->next_scan_state = SCAN_SEND_PROBE;
Helmut Schaa7d3be3c2009-07-23 12:13:41 +02001011}
1012
Johannes Berg07ef03e2011-11-08 16:21:21 +01001013static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
1014 unsigned long *next_delay)
1015{
1016 /* switch back to the operating channel */
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001017 local->scan_chandef.chan = NULL;
Johannes Berg07ef03e2011-11-08 16:21:21 +01001018 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
1019
Stanislaw Gruszkaaacde9e2012-12-20 14:41:18 +01001020 /* disable PS */
1021 ieee80211_offchannel_return(local);
Johannes Berg07ef03e2011-11-08 16:21:21 +01001022
1023 *next_delay = HZ / 5;
1024 /* afterwards, resume scan & go to next channel */
1025 local->next_scan_state = SCAN_RESUME;
1026}
1027
1028static void ieee80211_scan_state_resume(struct ieee80211_local *local,
1029 unsigned long *next_delay)
1030{
Stanislaw Gruszkaaacde9e2012-12-20 14:41:18 +01001031 ieee80211_offchannel_stop_vifs(local);
Johannes Berg07ef03e2011-11-08 16:21:21 +01001032
1033 if (local->ops->flush) {
Emmanuel Grumbach3b24f4c2015-01-07 15:42:39 +02001034 ieee80211_flush_queues(local, NULL, false);
Johannes Berg07ef03e2011-11-08 16:21:21 +01001035 *next_delay = 0;
1036 } else
1037 *next_delay = HZ / 10;
1038
1039 /* remember when we left the operating channel */
1040 local->leave_oper_channel_time = jiffies;
1041
1042 /* advance to the next channel to be scanned */
Mohammed Shafi Shajakhande2ee842011-12-24 18:43:28 +05301043 local->next_scan_state = SCAN_SET_CHANNEL;
Johannes Berg07ef03e2011-11-08 16:21:21 +01001044}
1045
Johannes Bergc2b13452008-09-11 00:01:55 +02001046void ieee80211_scan_work(struct work_struct *work)
Johannes Berg0a51b272008-09-08 17:44:25 +02001047{
1048 struct ieee80211_local *local =
1049 container_of(work, struct ieee80211_local, scan_work.work);
Johannes Bergd07bfd82011-03-07 15:48:41 +01001050 struct ieee80211_sub_if_data *sdata;
Johannes Berg6ea0a692014-11-19 11:55:49 +01001051 struct cfg80211_scan_request *scan_req;
Johannes Berg0a51b272008-09-08 17:44:25 +02001052 unsigned long next_delay = 0;
Eliad Peller8bd2a242013-12-05 11:21:27 +02001053 bool aborted;
Johannes Berg8789d452010-08-26 13:30:26 +02001054
Johannes Berga1699b72010-07-30 16:46:07 +02001055 mutex_lock(&local->mtx);
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +02001056
Luciano Coelho332ff7f2015-01-22 23:34:10 +02001057 if (!ieee80211_can_run_worker(local)) {
1058 aborted = true;
1059 goto out_complete;
1060 }
1061
Johannes Berge2fd5db2012-07-06 21:39:28 +02001062 sdata = rcu_dereference_protected(local->scan_sdata,
1063 lockdep_is_held(&local->mtx));
Johannes Berg6ea0a692014-11-19 11:55:49 +01001064 scan_req = rcu_dereference_protected(local->scan_req,
1065 lockdep_is_held(&local->mtx));
Johannes Bergd07bfd82011-03-07 15:48:41 +01001066
Ben Greear8a690672012-04-17 10:54:16 -07001067 /* When scanning on-channel, the first-callback means completed. */
1068 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
1069 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
1070 goto out_complete;
1071 }
1072
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +02001073 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
1074 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
1075 goto out_complete;
Johannes Bergf3b852522009-04-23 16:01:47 +02001076 }
1077
Johannes Berg6ea0a692014-11-19 11:55:49 +01001078 if (!sdata || !scan_req)
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +02001079 goto out;
1080
Eliad Pellerff5db432014-11-12 10:08:29 +02001081 if (!local->scanning) {
Johannes Bergf3b852522009-04-23 16:01:47 +02001082 int rc;
1083
Johannes Berg6ea0a692014-11-19 11:55:49 +01001084 RCU_INIT_POINTER(local->scan_req, NULL);
Monam Agarwal0c2bef462014-03-24 00:51:43 +05301085 RCU_INIT_POINTER(local->scan_sdata, NULL);
Johannes Bergf3b852522009-04-23 16:01:47 +02001086
Johannes Berg6ea0a692014-11-19 11:55:49 +01001087 rc = __ieee80211_start_scan(sdata, scan_req);
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +02001088 if (rc) {
Stanislaw Gruszka3aed49e2010-10-06 11:22:12 +02001089 /* need to complete scan in cfg80211 */
Johannes Berg6ea0a692014-11-19 11:55:49 +01001090 rcu_assign_pointer(local->scan_req, scan_req);
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +02001091 aborted = true;
1092 goto out_complete;
1093 } else
1094 goto out;
Johannes Bergf3b852522009-04-23 16:01:47 +02001095 }
1096
Felix Fietkaub041b7b2022-04-20 12:49:07 +02001097 clear_bit(SCAN_BEACON_WAIT, &local->scanning);
1098
Johannes Berg5bc75722008-09-11 00:01:51 +02001099 /*
Helmut Schaaf502d092009-07-23 12:13:48 +02001100 * as long as no delay is required advance immediately
1101 * without scheduling a new work
1102 */
1103 do {
Rajkumar Manoharanc29acf22011-05-14 09:43:28 +05301104 if (!ieee80211_sdata_running(sdata)) {
1105 aborted = true;
1106 goto out_complete;
1107 }
1108
Felix Fietkaub041b7b2022-04-20 12:49:07 +02001109 if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) &&
1110 local->next_scan_state == SCAN_DECISION)
1111 local->next_scan_state = SCAN_SEND_PROBE;
1112
Helmut Schaa977923b2009-07-23 12:14:20 +02001113 switch (local->next_scan_state) {
Helmut Schaa2fb3f022009-07-23 12:13:56 +02001114 case SCAN_DECISION:
Stanislaw Gruszkae229f842010-10-06 11:22:09 +02001115 /* if no more bands/channels left, complete scan */
Johannes Berg6ea0a692014-11-19 11:55:49 +01001116 if (local->scan_channel_idx >= scan_req->n_channels) {
Stanislaw Gruszkae229f842010-10-06 11:22:09 +02001117 aborted = false;
1118 goto out_complete;
1119 }
1120 ieee80211_scan_state_decision(local, &next_delay);
Helmut Schaaf502d092009-07-23 12:13:48 +02001121 break;
Helmut Schaa2fb3f022009-07-23 12:13:56 +02001122 case SCAN_SET_CHANNEL:
1123 ieee80211_scan_state_set_channel(local, &next_delay);
1124 break;
Helmut Schaaf502d092009-07-23 12:13:48 +02001125 case SCAN_SEND_PROBE:
1126 ieee80211_scan_state_send_probe(local, &next_delay);
1127 break;
Johannes Berg07ef03e2011-11-08 16:21:21 +01001128 case SCAN_SUSPEND:
1129 ieee80211_scan_state_suspend(local, &next_delay);
Helmut Schaa142b9f52009-07-23 13:18:01 +02001130 break;
Johannes Berg07ef03e2011-11-08 16:21:21 +01001131 case SCAN_RESUME:
1132 ieee80211_scan_state_resume(local, &next_delay);
Helmut Schaa142b9f52009-07-23 13:18:01 +02001133 break;
Sam Lefflercd2bb512012-10-11 21:03:35 -07001134 case SCAN_ABORT:
1135 aborted = true;
1136 goto out_complete;
Helmut Schaaf502d092009-07-23 12:13:48 +02001137 }
1138 } while (next_delay == 0);
Johannes Berg0a51b272008-09-08 17:44:25 +02001139
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -04001140 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
Johannes Bergd07bfd82011-03-07 15:48:41 +01001141 goto out;
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +02001142
1143out_complete:
Eliad Peller8bd2a242013-12-05 11:21:27 +02001144 __ieee80211_scan_completed(&local->hw, aborted);
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +02001145out:
1146 mutex_unlock(&local->mtx);
Johannes Berg0a51b272008-09-08 17:44:25 +02001147}
1148
Johannes Bergc2b13452008-09-11 00:01:55 +02001149int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
Johannes Berg2a519312009-02-10 21:25:55 +01001150 struct cfg80211_scan_request *req)
Johannes Berg0a51b272008-09-08 17:44:25 +02001151{
Johannes Bergf3b852522009-04-23 16:01:47 +02001152 int res;
1153
Johannes Berga1699b72010-07-30 16:46:07 +02001154 mutex_lock(&sdata->local->mtx);
Johannes Bergf3b852522009-04-23 16:01:47 +02001155 res = __ieee80211_start_scan(sdata, req);
Johannes Berga1699b72010-07-30 16:46:07 +02001156 mutex_unlock(&sdata->local->mtx);
Johannes Bergf3b852522009-04-23 16:01:47 +02001157
1158 return res;
1159}
1160
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001161int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
1162 const u8 *ssid, u8 ssid_len,
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001163 struct ieee80211_channel **channels,
1164 unsigned int n_channels,
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001165 enum nl80211_bss_scan_width scan_width)
Johannes Bergf3b852522009-04-23 16:01:47 +02001166{
Johannes Berg0a51b272008-09-08 17:44:25 +02001167 struct ieee80211_local *local = sdata->local;
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001168 int ret = -EBUSY, i, n_ch = 0;
Johannes Berg57fbcce2016-04-12 15:56:15 +02001169 enum nl80211_band band;
Johannes Berg0a51b272008-09-08 17:44:25 +02001170
Johannes Berga1699b72010-07-30 16:46:07 +02001171 mutex_lock(&local->mtx);
Johannes Berg2a519312009-02-10 21:25:55 +01001172
Johannes Bergf3b852522009-04-23 16:01:47 +02001173 /* busy scanning */
1174 if (local->scan_req)
1175 goto unlock;
Johannes Berg2a519312009-02-10 21:25:55 +01001176
Johannes Bergbe4a4b62010-05-03 08:49:48 +02001177 /* fill internal scan request */
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001178 if (!channels) {
1179 int max_n;
Johannes Bergbe4a4b62010-05-03 08:49:48 +02001180
Johannes Berg57fbcce2016-04-12 15:56:15 +02001181 for (band = 0; band < NUM_NL80211_BANDS; band++) {
Tova Mussaic8cb5b82020-09-18 11:33:13 +02001182 if (!local->hw.wiphy->bands[band] ||
1183 band == NL80211_BAND_6GHZ)
Johannes Bergbe4a4b62010-05-03 08:49:48 +02001184 continue;
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001185
1186 max_n = local->hw.wiphy->bands[band]->n_channels;
1187 for (i = 0; i < max_n; i++) {
1188 struct ieee80211_channel *tmp_ch =
Johannes Bergbe4a4b62010-05-03 08:49:48 +02001189 &local->hw.wiphy->bands[band]->channels[i];
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001190
Luis R. Rodriguez8fe02e12013-10-21 19:22:25 +02001191 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001192 IEEE80211_CHAN_DISABLED))
1193 continue;
1194
1195 local->int_scan_req->channels[n_ch] = tmp_ch;
1196 n_ch++;
Johannes Bergbe4a4b62010-05-03 08:49:48 +02001197 }
1198 }
1199
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001200 if (WARN_ON_ONCE(n_ch == 0))
1201 goto unlock;
1202
1203 local->int_scan_req->n_channels = n_ch;
Johannes Bergbe4a4b62010-05-03 08:49:48 +02001204 } else {
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001205 for (i = 0; i < n_channels; i++) {
1206 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1207 IEEE80211_CHAN_DISABLED))
1208 continue;
1209
1210 local->int_scan_req->channels[n_ch] = channels[i];
1211 n_ch++;
1212 }
1213
1214 if (WARN_ON_ONCE(n_ch == 0))
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +01001215 goto unlock;
1216
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +01001217 local->int_scan_req->n_channels = n_ch;
Johannes Bergbe4a4b62010-05-03 08:49:48 +02001218 }
1219
1220 local->int_scan_req->ssids = &local->scan_ssid;
1221 local->int_scan_req->n_ssids = 1;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +02001222 local->int_scan_req->scan_width = scan_width;
Johannes Berg5ba63532009-08-07 17:54:07 +02001223 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1224 local->int_scan_req->ssids[0].ssid_len = ssid_len;
Johannes Berg2a519312009-02-10 21:25:55 +01001225
Johannes Berg5ba63532009-08-07 17:54:07 +02001226 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
Johannes Bergf3b852522009-04-23 16:01:47 +02001227 unlock:
Johannes Berga1699b72010-07-30 16:46:07 +02001228 mutex_unlock(&local->mtx);
Johannes Bergf3b852522009-04-23 16:01:47 +02001229 return ret;
Johannes Berg0a51b272008-09-08 17:44:25 +02001230}
Johannes Berg5bb644a2009-05-17 11:40:42 +02001231
1232void ieee80211_scan_cancel(struct ieee80211_local *local)
1233{
Johannes Berg0fd3af62023-03-01 12:09:14 +02001234 /* ensure a new scan cannot be queued */
1235 lockdep_assert_wiphy(local->hw.wiphy);
1236
Johannes Berg5bb644a2009-05-17 11:40:42 +02001237 /*
Eliad Pellerb8564392011-06-13 12:47:30 +03001238 * We are canceling software scan, or deferred scan that was not
Stanislaw Gruszka4136c422010-10-06 11:22:10 +02001239 * yet really started (see __ieee80211_start_scan ).
1240 *
1241 * Regarding hardware scan:
1242 * - we can not call __ieee80211_scan_completed() as when
1243 * SCAN_HW_SCANNING bit is set this function change
1244 * local->hw_scan_req to operate on 5G band, what race with
1245 * driver which can use local->hw_scan_req
1246 *
1247 * - we can not cancel scan_work since driver can schedule it
1248 * by ieee80211_scan_completed(..., true) to finish scan
1249 *
Eliad Pellerb8564392011-06-13 12:47:30 +03001250 * Hence we only call the cancel_hw_scan() callback, but the low-level
1251 * driver is still responsible for calling ieee80211_scan_completed()
1252 * after the scan was completed/aborted.
Johannes Berg5bb644a2009-05-17 11:40:42 +02001253 */
Stanislaw Gruszka4136c422010-10-06 11:22:10 +02001254
Johannes Berga1699b72010-07-30 16:46:07 +02001255 mutex_lock(&local->mtx);
Eliad Pellerb8564392011-06-13 12:47:30 +03001256 if (!local->scan_req)
1257 goto out;
1258
Emmanuel Grumbacha7540552013-09-16 11:12:07 +03001259 /*
1260 * We have a scan running and the driver already reported completion,
1261 * but the worker hasn't run yet or is stuck on the mutex - mark it as
1262 * cancelled.
1263 */
1264 if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1265 test_bit(SCAN_COMPLETED, &local->scanning)) {
1266 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1267 goto out;
1268 }
1269
Eliad Pellerb8564392011-06-13 12:47:30 +03001270 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
Emmanuel Grumbacha7540552013-09-16 11:12:07 +03001271 /*
1272 * Make sure that __ieee80211_scan_completed doesn't trigger a
1273 * scan on another band.
1274 */
1275 set_bit(SCAN_HW_CANCELLED, &local->scanning);
Eliad Pellerb8564392011-06-13 12:47:30 +03001276 if (local->ops->cancel_hw_scan)
Johannes Berge2fd5db2012-07-06 21:39:28 +02001277 drv_cancel_hw_scan(local,
1278 rcu_dereference_protected(local->scan_sdata,
1279 lockdep_is_held(&local->mtx)));
Eliad Pellerb8564392011-06-13 12:47:30 +03001280 goto out;
Stanislaw Gruszka4136c422010-10-06 11:22:10 +02001281 }
Eliad Pellerb8564392011-06-13 12:47:30 +03001282
1283 /*
1284 * If the work is currently running, it must be blocked on
1285 * the mutex, but we'll set scan_sdata = NULL and it'll
1286 * simply exit once it acquires the mutex.
1287 */
1288 cancel_delayed_work(&local->scan_work);
1289 /* and clean up */
Avraham Stern7947d3e2016-07-05 15:23:12 +03001290 memset(&local->scan_info, 0, sizeof(local->scan_info));
Eliad Peller8bd2a242013-12-05 11:21:27 +02001291 __ieee80211_scan_completed(&local->hw, true);
Eliad Pellerb8564392011-06-13 12:47:30 +03001292out:
Johannes Bergd07bfd82011-03-07 15:48:41 +01001293 mutex_unlock(&local->mtx);
Johannes Berg5bb644a2009-05-17 11:40:42 +02001294}
Luciano Coelho79f460c2011-05-11 17:09:36 +03001295
David Spinadeld43c6b62013-12-08 21:48:57 +02001296int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1297 struct cfg80211_sched_scan_request *req)
Luciano Coelho79f460c2011-05-11 17:09:36 +03001298{
1299 struct ieee80211_local *local = sdata->local;
David Spinadel633e2712014-02-06 16:15:23 +02001300 struct ieee80211_scan_ies sched_scan_ies = {};
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001301 struct cfg80211_chan_def chandef;
David Spinadel633e2712014-02-06 16:15:23 +02001302 int ret, i, iebufsz, num_bands = 0;
Johannes Berg57fbcce2016-04-12 15:56:15 +02001303 u32 rate_masks[NUM_NL80211_BANDS] = {};
David Spinadel633e2712014-02-06 16:15:23 +02001304 u8 bands_used = 0;
1305 u8 *ie;
Johannes Bergb9771d42018-05-28 15:47:41 +02001306 u32 flags = 0;
Johannes Bergc604b9f2012-11-29 12:45:18 +01001307
David Spinadele4dcbb32014-02-11 13:45:41 +02001308 iebufsz = local->scan_ies_len + req->ie_len;
Luciano Coelho79f460c2011-05-11 17:09:36 +03001309
David Spinadeld43c6b62013-12-08 21:48:57 +02001310 lockdep_assert_held(&local->mtx);
Luciano Coelho79f460c2011-05-11 17:09:36 +03001311
David Spinadeld43c6b62013-12-08 21:48:57 +02001312 if (!local->ops->sched_scan_start)
1313 return -ENOTSUPP;
Luciano Coelho79f460c2011-05-11 17:09:36 +03001314
Johannes Berg57fbcce2016-04-12 15:56:15 +02001315 for (i = 0; i < NUM_NL80211_BANDS; i++) {
David Spinadel633e2712014-02-06 16:15:23 +02001316 if (local->hw.wiphy->bands[i]) {
1317 bands_used |= BIT(i);
1318 rate_masks[i] = (u32) -1;
1319 num_bands++;
Luciano Coelho79f460c2011-05-11 17:09:36 +03001320 }
Luciano Coelho79f460c2011-05-11 17:09:36 +03001321 }
1322
Johannes Bergb9771d42018-05-28 15:47:41 +02001323 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
1324 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
1325
Kees Cook6396bb22018-06-12 14:03:40 -07001326 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL);
David Spinadel633e2712014-02-06 16:15:23 +02001327 if (!ie) {
1328 ret = -ENOMEM;
1329 goto out;
1330 }
1331
1332 ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
1333
Ilan Peer2ad22742020-05-28 21:34:39 +02001334 ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz,
Kirtika Ruchandanicd5861b2016-11-23 20:45:49 -08001335 &sched_scan_ies, req->ie,
Johannes Berg00387f32018-05-28 15:47:38 +02001336 req->ie_len, bands_used, rate_masks, &chandef,
Johannes Bergb9771d42018-05-28 15:47:41 +02001337 flags);
David Spinadel633e2712014-02-06 16:15:23 +02001338
Johannes Berg30dd3ed2012-09-04 19:15:01 +02001339 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
David Spinadeld43c6b62013-12-08 21:48:57 +02001340 if (ret == 0) {
Johannes Berg5260a5b2012-07-06 21:55:11 +02001341 rcu_assign_pointer(local->sched_scan_sdata, sdata);
Johannes Berg6ea0a692014-11-19 11:55:49 +01001342 rcu_assign_pointer(local->sched_scan_req, req);
David Spinadeld43c6b62013-12-08 21:48:57 +02001343 }
Luciano Coelho79f460c2011-05-11 17:09:36 +03001344
David Spinadel633e2712014-02-06 16:15:23 +02001345 kfree(ie);
David Spinadeld43c6b62013-12-08 21:48:57 +02001346
David Spinadel633e2712014-02-06 16:15:23 +02001347out:
David Spinadeld43c6b62013-12-08 21:48:57 +02001348 if (ret) {
1349 /* Clean in case of failure after HW restart or upon resume. */
Monam Agarwal0c2bef462014-03-24 00:51:43 +05301350 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
Johannes Berg6ea0a692014-11-19 11:55:49 +01001351 RCU_INIT_POINTER(local->sched_scan_req, NULL);
David Spinadeld43c6b62013-12-08 21:48:57 +02001352 }
1353
1354 return ret;
1355}
1356
1357int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1358 struct cfg80211_sched_scan_request *req)
1359{
1360 struct ieee80211_local *local = sdata->local;
1361 int ret;
1362
1363 mutex_lock(&local->mtx);
1364
1365 if (rcu_access_pointer(local->sched_scan_sdata)) {
1366 mutex_unlock(&local->mtx);
1367 return -EBUSY;
1368 }
1369
1370 ret = __ieee80211_request_sched_scan_start(sdata, req);
1371
Johannes Berg5260a5b2012-07-06 21:55:11 +02001372 mutex_unlock(&local->mtx);
Luciano Coelho79f460c2011-05-11 17:09:36 +03001373 return ret;
1374}
1375
Eliad Peller0d440ea2015-10-25 10:59:33 +02001376int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
Luciano Coelho79f460c2011-05-11 17:09:36 +03001377{
Eliad Peller0d440ea2015-10-25 10:59:33 +02001378 struct ieee80211_sub_if_data *sched_scan_sdata;
1379 int ret = -ENOENT;
Luciano Coelho79f460c2011-05-11 17:09:36 +03001380
Johannes Berg5260a5b2012-07-06 21:55:11 +02001381 mutex_lock(&local->mtx);
Luciano Coelho79f460c2011-05-11 17:09:36 +03001382
1383 if (!local->ops->sched_scan_stop) {
1384 ret = -ENOTSUPP;
1385 goto out;
1386 }
1387
David Spinadeld43c6b62013-12-08 21:48:57 +02001388 /* We don't want to restart sched scan anymore. */
Johannes Berg6ea0a692014-11-19 11:55:49 +01001389 RCU_INIT_POINTER(local->sched_scan_req, NULL);
David Spinadeld43c6b62013-12-08 21:48:57 +02001390
Eliad Peller0d440ea2015-10-25 10:59:33 +02001391 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1392 lockdep_is_held(&local->mtx));
1393 if (sched_scan_sdata) {
1394 ret = drv_sched_scan_stop(local, sched_scan_sdata);
Alexander Bondar71228a12014-03-16 10:49:54 +02001395 if (!ret)
Andreea-Cristina Bernatad053a962014-08-22 16:14:49 +03001396 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
Alexander Bondar71228a12014-03-16 10:49:54 +02001397 }
Luciano Coelho79f460c2011-05-11 17:09:36 +03001398out:
Johannes Berg5260a5b2012-07-06 21:55:11 +02001399 mutex_unlock(&local->mtx);
Luciano Coelho79f460c2011-05-11 17:09:36 +03001400
1401 return ret;
1402}
1403
1404void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1405{
1406 struct ieee80211_local *local = hw_to_local(hw);
1407
1408 trace_api_sched_scan_results(local);
1409
Arend Van Sprielb34939b2017-04-28 13:40:28 +01001410 cfg80211_sched_scan_results(hw->wiphy, 0);
Luciano Coelho79f460c2011-05-11 17:09:36 +03001411}
1412EXPORT_SYMBOL(ieee80211_sched_scan_results);
1413
Johannes Bergf6837ba82014-04-30 14:19:04 +02001414void ieee80211_sched_scan_end(struct ieee80211_local *local)
Luciano Coelho85a99942011-05-12 16:28:29 +03001415{
Luciano Coelho85a99942011-05-12 16:28:29 +03001416 mutex_lock(&local->mtx);
1417
Johannes Berg5260a5b2012-07-06 21:55:11 +02001418 if (!rcu_access_pointer(local->sched_scan_sdata)) {
Luciano Coelho85a99942011-05-12 16:28:29 +03001419 mutex_unlock(&local->mtx);
1420 return;
1421 }
1422
Monam Agarwal0c2bef462014-03-24 00:51:43 +05301423 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
Luciano Coelho85a99942011-05-12 16:28:29 +03001424
David Spinadeld43c6b62013-12-08 21:48:57 +02001425 /* If sched scan was aborted by the driver. */
Johannes Berg6ea0a692014-11-19 11:55:49 +01001426 RCU_INIT_POINTER(local->sched_scan_req, NULL);
David Spinadeld43c6b62013-12-08 21:48:57 +02001427
Luciano Coelho85a99942011-05-12 16:28:29 +03001428 mutex_unlock(&local->mtx);
1429
Arend Van Sprielb34939b2017-04-28 13:40:28 +01001430 cfg80211_sched_scan_stopped(local->hw.wiphy, 0);
Luciano Coelho85a99942011-05-12 16:28:29 +03001431}
1432
Johannes Bergf6837ba82014-04-30 14:19:04 +02001433void ieee80211_sched_scan_stopped_work(struct work_struct *work)
1434{
1435 struct ieee80211_local *local =
1436 container_of(work, struct ieee80211_local,
1437 sched_scan_stopped_work);
1438
1439 ieee80211_sched_scan_end(local);
1440}
1441
Luciano Coelho79f460c2011-05-11 17:09:36 +03001442void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1443{
1444 struct ieee80211_local *local = hw_to_local(hw);
1445
1446 trace_api_sched_scan_stopped(local);
1447
Eliad Peller2bc533b2016-01-05 16:28:06 +02001448 /*
1449 * this shouldn't really happen, so for simplicity
1450 * simply ignore it, and let mac80211 reconfigure
1451 * the sched scan later on.
1452 */
1453 if (local->in_reconfig)
1454 return;
1455
Johannes Berg18db5942013-11-06 10:34:36 +01001456 schedule_work(&local->sched_scan_stopped_work);
Luciano Coelho79f460c2011-05-11 17:09:36 +03001457}
1458EXPORT_SYMBOL(ieee80211_sched_scan_stopped);