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Johannes Berg0a51b272008-09-08 17:44:25 +02001/*
Johannes Berg5484e232008-09-08 17:44:27 +02002 * Scanning implementation
3 *
Johannes Berg0a51b272008-09-08 17:44:25 +02004 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
Sara Sharon74d803b2015-06-03 10:44:17 +03009 * Copyright 2013-2015 Intel Mobile Communications GmbH
Johannes Berg0a51b272008-09-08 17:44:25 +020010 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
Johannes Berg0a51b272008-09-08 17:44:25 +020016#include <linux/if_arp.h>
Felix Fietkau888d04d2012-03-01 15:22:09 +010017#include <linux/etherdevice.h>
Johannes Berg078e1e62009-01-22 18:07:31 +010018#include <linux/rtnetlink.h>
Helmut Schaadf13cce2010-02-24 14:19:21 +010019#include <net/sch_generic.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040021#include <linux/export.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
Johannes Bergc2b13452008-09-11 00:01:55 +020058struct ieee80211_bss *
Johannes Berg5484e232008-09-08 17:44:27 +020059ieee80211_bss_info_update(struct ieee80211_local *local,
60 struct ieee80211_rx_status *rx_status,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +020061 struct ieee80211_mgmt *mgmt, size_t len,
Johannes Berg5484e232008-09-08 17:44:27 +020062 struct ieee802_11_elems *elems,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +020063 struct ieee80211_channel *channel)
Johannes Berg5484e232008-09-08 17:44:27 +020064{
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +020065 bool beacon = ieee80211_is_beacon(mgmt->frame_control);
Johannes Berg0c1ad2c2009-12-23 13:15:39 +010066 struct cfg80211_bss *cbss;
Johannes Bergc2b13452008-09-11 00:01:55 +020067 struct ieee80211_bss *bss;
Stanislaw Gruszkaf0b058b2010-04-28 15:17:03 +020068 int clen, srlen;
Johannes Berg61f6bba2015-10-13 11:36:21 +020069 struct cfg80211_inform_bss bss_meta = {};
Sara Sharon74d803b2015-06-03 10:44:17 +030070 bool signal_valid;
Johannes Berg2a519312009-02-10 21:25:55 +010071
Johannes Berg30686bf2015-06-02 21:39:54 +020072 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
Johannes Berg61f6bba2015-10-13 11:36:21 +020073 bss_meta.signal = rx_status->signal * 100;
Johannes Berg30686bf2015-06-02 21:39:54 +020074 else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
Johannes Berg61f6bba2015-10-13 11:36:21 +020075 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;
Johannes Berg2a519312009-02-10 21:25:55 +010076
Johannes Berg61f6bba2015-10-13 11:36:21 +020077 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +020078 if (rx_status->flag & RX_FLAG_5MHZ)
Johannes Berg61f6bba2015-10-13 11:36:21 +020079 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +020080 if (rx_status->flag & RX_FLAG_10MHZ)
Johannes Berg61f6bba2015-10-13 11:36:21 +020081 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +020082
Johannes Berg61f6bba2015-10-13 11:36:21 +020083 bss_meta.chan = channel;
84 cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
85 mgmt, len, GFP_ATOMIC);
Johannes Berg0c1ad2c2009-12-23 13:15:39 +010086 if (!cbss)
Johannes Berg00d3f142009-02-10 21:26:00 +010087 return NULL;
Sara Sharon74d803b2015-06-03 10:44:17 +030088 /* In case the signal is invalid update the status */
89 signal_valid = abs(channel->center_freq - cbss->channel->center_freq)
90 <= local->hw.wiphy->max_adj_channel_rssi_comp;
91 if (!signal_valid)
92 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
Johannes Berg00d3f142009-02-10 21:26:00 +010093
Johannes Berg0c1ad2c2009-12-23 13:15:39 +010094 bss = (void *)cbss->priv;
Johannes Berg5484e232008-09-08 17:44:27 +020095
Johannes Bergef429da2013-02-05 17:48:40 +010096 if (beacon)
97 bss->device_ts_beacon = rx_status->device_timestamp;
98 else
99 bss->device_ts_presp = rx_status->device_timestamp;
Johannes Berg8c358bc2012-05-22 22:13:05 +0200100
Paul Stewartfcff4f12012-02-23 17:59:53 -0800101 if (elems->parse_error) {
102 if (beacon)
103 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
104 else
105 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
106 } else {
107 if (beacon)
108 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
109 else
110 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
Johannes Berg5484e232008-09-08 17:44:27 +0200111 }
112
Paul Stewartfcff4f12012-02-23 17:59:53 -0800113 /* save the ERP value so that it is available at association time */
Johannes Berg1946bed2013-03-27 14:31:53 +0100114 if (elems->erp_info && (!elems->parse_error ||
115 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
Paul Stewartfcff4f12012-02-23 17:59:53 -0800116 bss->erp_value = elems->erp_info[0];
117 bss->has_erp_value = true;
118 if (!elems->parse_error)
119 bss->valid_data |= IEEE80211_BSS_VALID_ERP;
120 }
121
Stanislaw Gruszkaf0b058b2010-04-28 15:17:03 +0200122 /* replace old supported rates if we get new values */
Paul Stewartfcff4f12012-02-23 17:59:53 -0800123 if (!elems->parse_error ||
124 !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
125 srlen = 0;
126 if (elems->supp_rates) {
127 clen = IEEE80211_MAX_SUPP_RATES;
128 if (clen > elems->supp_rates_len)
129 clen = elems->supp_rates_len;
130 memcpy(bss->supp_rates, elems->supp_rates, clen);
131 srlen += clen;
132 }
133 if (elems->ext_supp_rates) {
134 clen = IEEE80211_MAX_SUPP_RATES - srlen;
135 if (clen > elems->ext_supp_rates_len)
136 clen = elems->ext_supp_rates_len;
137 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
138 clen);
139 srlen += clen;
140 }
141 if (srlen) {
142 bss->supp_rates_len = srlen;
143 if (!elems->parse_error)
144 bss->valid_data |= IEEE80211_BSS_VALID_RATES;
145 }
Johannes Berg5484e232008-09-08 17:44:27 +0200146 }
Johannes Berg5484e232008-09-08 17:44:27 +0200147
Paul Stewartfcff4f12012-02-23 17:59:53 -0800148 if (!elems->parse_error ||
149 !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
150 bss->wmm_used = elems->wmm_param || elems->wmm_info;
151 bss->uapsd_supported = is_uapsd_supported(elems);
152 if (!elems->parse_error)
153 bss->valid_data |= IEEE80211_BSS_VALID_WMM;
154 }
Johannes Berg5484e232008-09-08 17:44:27 +0200155
Alexander Bondar817cee72013-05-19 14:23:57 +0300156 if (beacon) {
157 struct ieee80211_supported_band *sband =
158 local->hw.wiphy->bands[rx_status->band];
159 if (!(rx_status->flag & RX_FLAG_HT) &&
160 !(rx_status->flag & RX_FLAG_VHT))
161 bss->beacon_rate =
162 &sband->bitrates[rx_status->rate_idx];
163 }
164
Johannes Berg5484e232008-09-08 17:44:27 +0200165 return bss;
166}
Johannes Berg0a51b272008-09-08 17:44:25 +0200167
Johannes Bergd48b2962012-07-06 22:19:27 +0200168void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200169{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200170 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Bergd48b2962012-07-06 22:19:27 +0200171 struct ieee80211_sub_if_data *sdata1, *sdata2;
172 struct ieee80211_mgmt *mgmt = (void *)skb->data;
Johannes Bergc2b13452008-09-11 00:01:55 +0200173 struct ieee80211_bss *bss;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200174 u8 *elements;
175 struct ieee80211_channel *channel;
176 size_t baselen;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200177 struct ieee802_11_elems elems;
178
Johannes Bergd48b2962012-07-06 22:19:27 +0200179 if (skb->len < 24 ||
180 (!ieee80211_is_probe_resp(mgmt->frame_control) &&
181 !ieee80211_is_beacon(mgmt->frame_control)))
182 return;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200183
Johannes Bergd48b2962012-07-06 22:19:27 +0200184 sdata1 = rcu_dereference(local->scan_sdata);
185 sdata2 = rcu_dereference(local->sched_scan_sdata);
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200186
Johannes Bergd48b2962012-07-06 22:19:27 +0200187 if (likely(!sdata1 && !sdata2))
188 return;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200189
Johannes Bergd48b2962012-07-06 22:19:27 +0200190 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
Johannes Berga344d672014-06-12 22:24:31 +0200191 struct cfg80211_scan_request *scan_req;
192 struct cfg80211_sched_scan_request *sched_scan_req;
193
194 scan_req = rcu_dereference(local->scan_req);
195 sched_scan_req = rcu_dereference(local->sched_scan_req);
196
197 /* ignore ProbeResp to foreign address unless scanning
198 * with randomised address
199 */
200 if (!(sdata1 &&
201 (ether_addr_equal(mgmt->da, sdata1->vif.addr) ||
202 scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)) &&
203 !(sdata2 &&
204 (ether_addr_equal(mgmt->da, sdata2->vif.addr) ||
205 sched_scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)))
Johannes Bergd48b2962012-07-06 22:19:27 +0200206 return;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200207
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200208 elements = mgmt->u.probe_resp.variable;
209 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
210 } else {
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200211 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
212 elements = mgmt->u.beacon.variable;
213 }
214
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200215 if (baselen > skb->len)
Johannes Bergd48b2962012-07-06 22:19:27 +0200216 return;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200217
Johannes Bergb2e506b2013-03-26 14:54:16 +0100218 ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems);
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200219
Johannes Berg0172bb72012-11-23 14:23:30 +0100220 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200221
222 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
Johannes Bergd48b2962012-07-06 22:19:27 +0200223 return;
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200224
Johannes Bergd48b2962012-07-06 22:19:27 +0200225 bss = ieee80211_bss_info_update(local, rx_status,
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200226 mgmt, skb->len, &elems,
Emmanuel Grumbachd45c4172012-12-10 16:19:13 +0200227 channel);
Jouni Malinend048e502008-10-11 03:29:55 +0300228 if (bss)
Johannes Bergd48b2962012-07-06 22:19:27 +0200229 ieee80211_rx_bss_put(local, bss);
Johannes Berg98c8fcc2008-09-08 17:44:26 +0200230}
231
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200232static void
233ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef,
234 enum nl80211_bss_scan_width scan_width)
235{
236 memset(chandef, 0, sizeof(*chandef));
237 switch (scan_width) {
238 case NL80211_BSS_CHAN_WIDTH_5:
239 chandef->width = NL80211_CHAN_WIDTH_5;
240 break;
241 case NL80211_BSS_CHAN_WIDTH_10:
242 chandef->width = NL80211_CHAN_WIDTH_10;
243 break;
244 default:
245 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
246 break;
247 }
248}
249
Johannes Berg4d36ec582009-10-27 20:59:55 +0100250/* return false if no more work */
251static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
252{
Johannes Berg6ea0a692014-11-19 11:55:49 +0100253 struct cfg80211_scan_request *req;
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200254 struct cfg80211_chan_def chandef;
David Spinadelc56ef672014-02-05 15:21:13 +0200255 u8 bands_used = 0;
Johannes Berg4d36ec582009-10-27 20:59:55 +0100256 int i, ielen, n_chans;
257
Johannes Berg6ea0a692014-11-19 11:55:49 +0100258 req = rcu_dereference_protected(local->scan_req,
259 lockdep_is_held(&local->mtx));
260
Emmanuel Grumbacha7540552013-09-16 11:12:07 +0300261 if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
262 return false;
263
Johannes Berg30686bf2015-06-02 21:39:54 +0200264 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
Johannes Berg4d36ec582009-10-27 20:59:55 +0100265 for (i = 0; i < req->n_channels; i++) {
David Spinadelc56ef672014-02-05 15:21:13 +0200266 local->hw_scan_req->req.channels[i] = req->channels[i];
267 bands_used |= BIT(req->channels[i]->band);
Johannes Berg4d36ec582009-10-27 20:59:55 +0100268 }
269
David Spinadelc56ef672014-02-05 15:21:13 +0200270 n_chans = req->n_channels;
271 } else {
272 do {
273 if (local->hw_scan_band == IEEE80211_NUM_BANDS)
274 return false;
Johannes Berg4d36ec582009-10-27 20:59:55 +0100275
David Spinadelc56ef672014-02-05 15:21:13 +0200276 n_chans = 0;
277
278 for (i = 0; i < req->n_channels; i++) {
279 if (req->channels[i]->band !=
280 local->hw_scan_band)
281 continue;
282 local->hw_scan_req->req.channels[n_chans] =
283 req->channels[i];
284 n_chans++;
285 bands_used |= BIT(req->channels[i]->band);
286 }
287
288 local->hw_scan_band++;
289 } while (!n_chans);
290 }
291
292 local->hw_scan_req->req.n_channels = n_chans;
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200293 ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
Johannes Berg4d36ec582009-10-27 20:59:55 +0100294
David Spinadelc56ef672014-02-05 15:21:13 +0200295 ielen = ieee80211_build_preq_ies(local,
296 (u8 *)local->hw_scan_req->req.ie,
Johannes Bergc604b9f2012-11-29 12:45:18 +0100297 local->hw_scan_ies_bufsize,
David Spinadelc56ef672014-02-05 15:21:13 +0200298 &local->hw_scan_req->ies,
299 req->ie, req->ie_len,
300 bands_used, req->rates, &chandef);
301 local->hw_scan_req->req.ie_len = ielen;
302 local->hw_scan_req->req.no_cck = req->no_cck;
Johannes Berga344d672014-06-12 22:24:31 +0200303 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
304 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
305 req->mac_addr_mask);
Johannes Berg4d36ec582009-10-27 20:59:55 +0100306
307 return true;
308}
309
Eliad Peller8bd2a242013-12-05 11:21:27 +0200310static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
Johannes Berg0a51b272008-09-08 17:44:25 +0200311{
312 struct ieee80211_local *local = hw_to_local(hw);
Eliad Peller8bd2a242013-12-05 11:21:27 +0200313 bool hw_scan = local->ops->hw_scan;
Eliad Pellera2b70e82013-12-05 11:21:28 +0200314 bool was_scanning = local->scanning;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100315 struct cfg80211_scan_request *scan_req;
Johannes Berga344d672014-06-12 22:24:31 +0200316 struct ieee80211_sub_if_data *scan_sdata;
Johannes Berg0a51b272008-09-08 17:44:25 +0200317
Stanislaw Gruszkae229f842010-10-06 11:22:09 +0200318 lockdep_assert_held(&local->mtx);
Johannes Bergf3b85252009-04-23 16:01:47 +0200319
Johannes Berg6d3560d2009-10-31 07:44:08 +0100320 /*
321 * It's ok to abort a not-yet-running scan (that
322 * we have one at all will be verified by checking
323 * local->scan_req next), but not to complete it
324 * successfully.
325 */
326 if (WARN_ON(!local->scanning && !aborted))
327 aborted = true;
Johannes Bergde95a542009-04-01 11:58:36 +0200328
Stanislaw Gruszkae229f842010-10-06 11:22:09 +0200329 if (WARN_ON(!local->scan_req))
Johannes Bergd07bfd82011-03-07 15:48:41 +0100330 return;
Johannes Bergf3b85252009-04-23 16:01:47 +0200331
David Spinadelc56ef672014-02-05 15:21:13 +0200332 if (hw_scan && !aborted &&
Johannes Berg30686bf2015-06-02 21:39:54 +0200333 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
David Spinadelc56ef672014-02-05 15:21:13 +0200334 ieee80211_prep_hw_scan(local)) {
Johannes Berge2fd5db2012-07-06 21:39:28 +0200335 int rc;
336
337 rc = drv_hw_scan(local,
338 rcu_dereference_protected(local->scan_sdata,
339 lockdep_is_held(&local->mtx)),
340 local->hw_scan_req);
341
Stanislaw Gruszka6eb11a92010-10-06 11:22:11 +0200342 if (rc == 0)
Johannes Bergd07bfd82011-03-07 15:48:41 +0100343 return;
Johannes Berg4d36ec582009-10-27 20:59:55 +0100344 }
345
346 kfree(local->hw_scan_req);
347 local->hw_scan_req = NULL;
Johannes Bergf3b85252009-04-23 16:01:47 +0200348
Johannes Berg6ea0a692014-11-19 11:55:49 +0100349 scan_req = rcu_dereference_protected(local->scan_req,
350 lockdep_is_held(&local->mtx));
351
352 if (scan_req != local->int_scan_req)
353 cfg80211_scan_done(scan_req, aborted);
354 RCU_INIT_POINTER(local->scan_req, NULL);
Johannes Berga344d672014-06-12 22:24:31 +0200355
356 scan_sdata = rcu_dereference_protected(local->scan_sdata,
357 lockdep_is_held(&local->mtx));
Monam Agarwal0c2bef462014-03-24 00:51:43 +0530358 RCU_INIT_POINTER(local->scan_sdata, NULL);
Johannes Berg2a519312009-02-10 21:25:55 +0100359
Helmut Schaafbe9c422009-07-23 12:14:04 +0200360 local->scanning = 0;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200361 local->scan_chandef.chan = NULL;
Johannes Bergf3b85252009-04-23 16:01:47 +0200362
Johannes Berg07ef03e2011-11-08 16:21:21 +0100363 /* Set power back to normal operating levels. */
364 ieee80211_hw_config(local, 0);
Ben Greearb23b0252011-02-04 11:54:17 -0800365
Eliad Peller8bd2a242013-12-05 11:21:27 +0200366 if (!hw_scan) {
Ben Greearb23b0252011-02-04 11:54:17 -0800367 ieee80211_configure_filter(local);
Johannes Berga344d672014-06-12 22:24:31 +0200368 drv_sw_scan_complete(local, scan_sdata);
Stanislaw Gruszkaaacde9e2012-12-20 14:41:18 +0100369 ieee80211_offchannel_return(local);
Ben Greearb23b0252011-02-04 11:54:17 -0800370 }
371
Johannes Berg5cff20e2009-04-29 12:26:17 +0200372 ieee80211_recalc_idle(local);
Stanislaw Gruszkae229f842010-10-06 11:22:09 +0200373
Johannes Berg0a51b272008-09-08 17:44:25 +0200374 ieee80211_mlme_notify_scan_completed(local);
Johannes Berg46900292009-02-15 12:44:28 +0100375 ieee80211_ibss_notify_scan_completed(local);
Johannes Berg472dbc42008-09-11 00:01:49 +0200376 ieee80211_mesh_notify_scan_completed(local);
Eliad Pellera2b70e82013-12-05 11:21:28 +0200377 if (was_scanning)
378 ieee80211_start_next_roc(local);
Johannes Berg0a51b272008-09-08 17:44:25 +0200379}
Johannes Berg8789d452010-08-26 13:30:26 +0200380
381void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
382{
383 struct ieee80211_local *local = hw_to_local(hw);
384
385 trace_api_scan_completed(local, aborted);
386
387 set_bit(SCAN_COMPLETED, &local->scanning);
388 if (aborted)
389 set_bit(SCAN_ABORTED, &local->scanning);
390 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
391}
Johannes Berg0a51b272008-09-08 17:44:25 +0200392EXPORT_SYMBOL(ieee80211_scan_completed);
393
Johannes Berga344d672014-06-12 22:24:31 +0200394static int ieee80211_start_sw_scan(struct ieee80211_local *local,
395 struct ieee80211_sub_if_data *sdata)
Johannes Bergf3b85252009-04-23 16:01:47 +0200396{
Johannes Bergfe57d9f2012-07-26 14:55:08 +0200397 /* Software scan is not supported in multi-channel cases */
398 if (local->use_chanctx)
399 return -EOPNOTSUPP;
400
Johannes Bergf3b85252009-04-23 16:01:47 +0200401 /*
402 * Hardware/driver doesn't support hw_scan, so use software
403 * scanning instead. First send a nullfunc frame with power save
404 * bit on so that AP will buffer the frames for us while we are not
405 * listening, then send probe requests to each channel and wait for
406 * the responses. After all channels are scanned, tune back to the
407 * original channel and send a nullfunc frame with power save bit
408 * off to trigger the AP to send us all the buffered frames.
409 *
410 * Note that while local->sw_scanning is true everything else but
411 * nullfunc frames and probe requests will be dropped in
412 * ieee80211_tx_h_check_assoc().
413 */
Johannes Berga344d672014-06-12 22:24:31 +0200414 drv_sw_scan_start(local, sdata, local->scan_addr);
Johannes Bergf3b85252009-04-23 16:01:47 +0200415
Rajkumar Manoharande312db2012-03-27 11:01:06 +0530416 local->leave_oper_channel_time = jiffies;
Helmut Schaa977923b2009-07-23 12:14:20 +0200417 local->next_scan_state = SCAN_DECISION;
Johannes Bergf3b85252009-04-23 16:01:47 +0200418 local->scan_channel_idx = 0;
419
Stanislaw Gruszkaaacde9e2012-12-20 14:41:18 +0100420 ieee80211_offchannel_stop_vifs(local);
Johannes Berga80f7c02009-12-23 13:15:32 +0100421
Seth Forshee9c35d7d2013-02-11 11:21:08 -0600422 /* ensure nullfunc is transmitted before leaving operating channel */
Emmanuel Grumbach3b24f4c2015-01-07 15:42:39 +0200423 ieee80211_flush_queues(local, NULL, false);
Seth Forshee9c35d7d2013-02-11 11:21:08 -0600424
Johannes Berg3ac64be2009-08-17 16:16:53 +0200425 ieee80211_configure_filter(local);
Johannes Bergf3b85252009-04-23 16:01:47 +0200426
Ben Greear59bdf3b2011-02-07 13:44:38 -0800427 /* We need to set power level at maximum rate for scanning. */
428 ieee80211_hw_config(local, 0);
429
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -0400430 ieee80211_queue_delayed_work(&local->hw,
Johannes Berg07ef03e2011-11-08 16:21:21 +0100431 &local->scan_work, 0);
Johannes Bergf3b85252009-04-23 16:01:47 +0200432
433 return 0;
434}
435
Stanislaw Gruszka133d40f2012-03-28 16:01:19 +0200436static bool ieee80211_can_scan(struct ieee80211_local *local,
437 struct ieee80211_sub_if_data *sdata)
438{
Eliad Peller5cbc95a2015-01-07 17:50:09 +0200439 if (ieee80211_is_radar_required(local))
Simon Wunderlich164eb022013-02-08 18:16:20 +0100440 return false;
441
Johannes Berg2eb278e2012-06-05 14:28:42 +0200442 if (!list_empty(&local->roc_list))
Stanislaw Gruszka133d40f2012-03-28 16:01:19 +0200443 return false;
444
445 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
Stanislaw Gruszka392b9ff2013-08-27 11:36:35 +0200446 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
Stanislaw Gruszka133d40f2012-03-28 16:01:19 +0200447 return false;
448
449 return true;
450}
451
452void ieee80211_run_deferred_scan(struct ieee80211_local *local)
453{
454 lockdep_assert_held(&local->mtx);
455
456 if (!local->scan_req || local->scanning)
457 return;
458
Johannes Berge2fd5db2012-07-06 21:39:28 +0200459 if (!ieee80211_can_scan(local,
460 rcu_dereference_protected(
461 local->scan_sdata,
462 lockdep_is_held(&local->mtx))))
Stanislaw Gruszka133d40f2012-03-28 16:01:19 +0200463 return;
464
465 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
466 round_jiffies_relative(0));
467}
Johannes Bergf3b85252009-04-23 16:01:47 +0200468
Ben Greear8a690672012-04-17 10:54:16 -0700469static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
470 unsigned long *next_delay)
471{
472 int i;
Johannes Berge2fd5db2012-07-06 21:39:28 +0200473 struct ieee80211_sub_if_data *sdata;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100474 struct cfg80211_scan_request *scan_req;
Karl Beldan675a0b02013-03-25 16:26:57 +0100475 enum ieee80211_band band = local->hw.conf.chandef.chan->band;
Seth Forshee6c17b772013-02-11 11:21:07 -0600476 u32 tx_flags;
477
Johannes Berg6ea0a692014-11-19 11:55:49 +0100478 scan_req = rcu_dereference_protected(local->scan_req,
479 lockdep_is_held(&local->mtx));
480
Seth Forshee6c17b772013-02-11 11:21:07 -0600481 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100482 if (scan_req->no_cck)
Seth Forshee6c17b772013-02-11 11:21:07 -0600483 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
Ben Greear8a690672012-04-17 10:54:16 -0700484
Johannes Berge2fd5db2012-07-06 21:39:28 +0200485 sdata = rcu_dereference_protected(local->scan_sdata,
Peter Senna Tschudin316b6b52012-09-06 18:09:16 +0200486 lockdep_is_held(&local->mtx));
Johannes Berge2fd5db2012-07-06 21:39:28 +0200487
Johannes Berg6ea0a692014-11-19 11:55:49 +0100488 for (i = 0; i < scan_req->n_ssids; i++)
Ben Greear8a690672012-04-17 10:54:16 -0700489 ieee80211_send_probe_req(
Johannes Berga344d672014-06-12 22:24:31 +0200490 sdata, local->scan_addr, NULL,
Johannes Berg6ea0a692014-11-19 11:55:49 +0100491 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
492 scan_req->ie, scan_req->ie_len,
493 scan_req->rates[band], false,
Karl Beldan675a0b02013-03-25 16:26:57 +0100494 tx_flags, local->hw.conf.chandef.chan, true);
Ben Greear8a690672012-04-17 10:54:16 -0700495
496 /*
497 * After sending probe requests, wait for probe responses
498 * on the channel.
499 */
500 *next_delay = IEEE80211_CHANNEL_TIME;
501 local->next_scan_state = SCAN_DECISION;
502}
503
Johannes Bergf3b85252009-04-23 16:01:47 +0200504static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
505 struct cfg80211_scan_request *req)
506{
507 struct ieee80211_local *local = sdata->local;
Johannes Bergf3b85252009-04-23 16:01:47 +0200508 int rc;
509
Stanislaw Gruszkae229f842010-10-06 11:22:09 +0200510 lockdep_assert_held(&local->mtx);
511
Eliad Peller2726f232015-01-07 17:50:11 +0200512 if (local->scan_req || ieee80211_is_radar_required(local))
Johannes Bergf3b85252009-04-23 16:01:47 +0200513 return -EBUSY;
514
Stanislaw Gruszka133d40f2012-03-28 16:01:19 +0200515 if (!ieee80211_can_scan(local, sdata)) {
John W. Linville6e7e6212010-02-08 16:38:38 -0500516 /* wait for the work to finish/time out */
Johannes Berg6ea0a692014-11-19 11:55:49 +0100517 rcu_assign_pointer(local->scan_req, req);
Johannes Berge2fd5db2012-07-06 21:39:28 +0200518 rcu_assign_pointer(local->scan_sdata, sdata);
Johannes Bergc0ce77b2010-02-03 10:22:31 +0100519 return 0;
520 }
521
Johannes Bergf3b85252009-04-23 16:01:47 +0200522 if (local->ops->hw_scan) {
523 u8 *ies;
Johannes Bergf3b85252009-04-23 16:01:47 +0200524
David Spinadele4dcbb32014-02-11 13:45:41 +0200525 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
David Spinadelc56ef672014-02-05 15:21:13 +0200526
Johannes Berg30686bf2015-06-02 21:39:54 +0200527 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
David Spinadelc56ef672014-02-05 15:21:13 +0200528 int i, n_bands = 0;
529 u8 bands_counted = 0;
530
531 for (i = 0; i < req->n_channels; i++) {
532 if (bands_counted & BIT(req->channels[i]->band))
533 continue;
534 bands_counted |= BIT(req->channels[i]->band);
535 n_bands++;
536 }
537
538 local->hw_scan_ies_bufsize *= n_bands;
539 }
540
Johannes Berg4d36ec582009-10-27 20:59:55 +0100541 local->hw_scan_req = kmalloc(
542 sizeof(*local->hw_scan_req) +
543 req->n_channels * sizeof(req->channels[0]) +
Johannes Bergc604b9f2012-11-29 12:45:18 +0100544 local->hw_scan_ies_bufsize, GFP_KERNEL);
Johannes Berg4d36ec582009-10-27 20:59:55 +0100545 if (!local->hw_scan_req)
Johannes Bergf3b85252009-04-23 16:01:47 +0200546 return -ENOMEM;
547
David Spinadelc56ef672014-02-05 15:21:13 +0200548 local->hw_scan_req->req.ssids = req->ssids;
549 local->hw_scan_req->req.n_ssids = req->n_ssids;
Johannes Berg4d36ec582009-10-27 20:59:55 +0100550 ies = (u8 *)local->hw_scan_req +
551 sizeof(*local->hw_scan_req) +
552 req->n_channels * sizeof(req->channels[0]);
David Spinadelc56ef672014-02-05 15:21:13 +0200553 local->hw_scan_req->req.ie = ies;
554 local->hw_scan_req->req.flags = req->flags;
Johannes Berg4d36ec582009-10-27 20:59:55 +0100555
556 local->hw_scan_band = 0;
John W. Linville6e7e6212010-02-08 16:38:38 -0500557
558 /*
559 * After allocating local->hw_scan_req, we must
560 * go through until ieee80211_prep_hw_scan(), so
561 * anything that might be changed here and leave
562 * this function early must not go after this
563 * allocation.
564 */
Johannes Bergf3b85252009-04-23 16:01:47 +0200565 }
566
Johannes Berg6ea0a692014-11-19 11:55:49 +0100567 rcu_assign_pointer(local->scan_req, req);
Johannes Berge2fd5db2012-07-06 21:39:28 +0200568 rcu_assign_pointer(local->scan_sdata, sdata);
Johannes Bergf3b85252009-04-23 16:01:47 +0200569
Johannes Berga344d672014-06-12 22:24:31 +0200570 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
571 get_random_mask_addr(local->scan_addr,
572 req->mac_addr,
573 req->mac_addr_mask);
574 else
575 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
576
Ben Greear8a690672012-04-17 10:54:16 -0700577 if (local->ops->hw_scan) {
Helmut Schaafbe9c422009-07-23 12:14:04 +0200578 __set_bit(SCAN_HW_SCANNING, &local->scanning);
Ben Greear8a690672012-04-17 10:54:16 -0700579 } else if ((req->n_channels == 1) &&
Karl Beldan675a0b02013-03-25 16:26:57 +0100580 (req->channels[0] == local->_oper_chandef.chan)) {
Johannes Berg9b864872012-07-26 14:38:32 +0200581 /*
582 * If we are scanning only on the operating channel
583 * then we do not need to stop normal activities
Ben Greear8a690672012-04-17 10:54:16 -0700584 */
585 unsigned long next_delay;
586
587 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
588
589 ieee80211_recalc_idle(local);
590
591 /* Notify driver scan is starting, keep order of operations
592 * same as normal software scan, in case that matters. */
Johannes Berga344d672014-06-12 22:24:31 +0200593 drv_sw_scan_start(local, sdata, local->scan_addr);
Ben Greear8a690672012-04-17 10:54:16 -0700594
595 ieee80211_configure_filter(local); /* accept probe-responses */
596
597 /* We need to ensure power level is at max for scanning. */
598 ieee80211_hw_config(local, 0);
599
Antonio Quartulli4e39cca2015-11-21 18:13:40 +0800600 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
601 IEEE80211_CHAN_RADAR)) ||
Johannes Berg6ea0a692014-11-19 11:55:49 +0100602 !req->n_ssids) {
Ben Greear8a690672012-04-17 10:54:16 -0700603 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
604 } else {
605 ieee80211_scan_state_send_probe(local, &next_delay);
606 next_delay = IEEE80211_CHANNEL_TIME;
607 }
608
609 /* Now, just wait a bit and we are all done! */
610 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
611 next_delay);
612 return 0;
613 } else {
614 /* Do normal software scan */
Helmut Schaafbe9c422009-07-23 12:14:04 +0200615 __set_bit(SCAN_SW_SCANNING, &local->scanning);
Ben Greear8a690672012-04-17 10:54:16 -0700616 }
John W. Linville6e7e6212010-02-08 16:38:38 -0500617
Johannes Berg5cff20e2009-04-29 12:26:17 +0200618 ieee80211_recalc_idle(local);
Johannes Bergf3b85252009-04-23 16:01:47 +0200619
Johannes Berg4d36ec582009-10-27 20:59:55 +0100620 if (local->ops->hw_scan) {
621 WARN_ON(!ieee80211_prep_hw_scan(local));
Johannes Berga060bbf2010-04-27 11:59:34 +0200622 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
Johannes Berga344d672014-06-12 22:24:31 +0200623 } else {
624 rc = ieee80211_start_sw_scan(local, sdata);
625 }
Johannes Bergf3b85252009-04-23 16:01:47 +0200626
Johannes Bergf3b85252009-04-23 16:01:47 +0200627 if (rc) {
Johannes Berg4d36ec582009-10-27 20:59:55 +0100628 kfree(local->hw_scan_req);
629 local->hw_scan_req = NULL;
Helmut Schaafbe9c422009-07-23 12:14:04 +0200630 local->scanning = 0;
Johannes Bergf3b85252009-04-23 16:01:47 +0200631
Johannes Berg5cff20e2009-04-29 12:26:17 +0200632 ieee80211_recalc_idle(local);
633
Johannes Bergf3b85252009-04-23 16:01:47 +0200634 local->scan_req = NULL;
Monam Agarwal0c2bef462014-03-24 00:51:43 +0530635 RCU_INIT_POINTER(local->scan_sdata, NULL);
Johannes Bergf3b85252009-04-23 16:01:47 +0200636 }
637
638 return rc;
639}
640
Helmut Schaadf13cce2010-02-24 14:19:21 +0100641static unsigned long
642ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
643{
644 /*
645 * TODO: channel switching also consumes quite some time,
646 * add that delay as well to get a better estimation
647 */
Antonio Quartulli4e39cca2015-11-21 18:13:40 +0800648 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
Helmut Schaadf13cce2010-02-24 14:19:21 +0100649 return IEEE80211_PASSIVE_CHANNEL_TIME;
650 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
651}
652
Stanislaw Gruszkae229f842010-10-06 11:22:09 +0200653static void ieee80211_scan_state_decision(struct ieee80211_local *local,
654 unsigned long *next_delay)
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200655{
Helmut Schaa142b9f52009-07-23 13:18:01 +0200656 bool associated = false;
Helmut Schaadf13cce2010-02-24 14:19:21 +0100657 bool tx_empty = true;
658 bool bad_latency;
Helmut Schaa142b9f52009-07-23 13:18:01 +0200659 struct ieee80211_sub_if_data *sdata;
Helmut Schaadf13cce2010-02-24 14:19:21 +0100660 struct ieee80211_channel *next_chan;
Sam Lefflercd2bb512012-10-11 21:03:35 -0700661 enum mac80211_scan_state next_scan_state;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100662 struct cfg80211_scan_request *scan_req;
Helmut Schaa142b9f52009-07-23 13:18:01 +0200663
Helmut Schaadf13cce2010-02-24 14:19:21 +0100664 /*
665 * check if at least one STA interface is associated,
666 * check if at least one STA interface has pending tx frames
667 * and grab the lowest used beacon interval
668 */
Helmut Schaa142b9f52009-07-23 13:18:01 +0200669 mutex_lock(&local->iflist_mtx);
670 list_for_each_entry(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +0100671 if (!ieee80211_sdata_running(sdata))
Helmut Schaa142b9f52009-07-23 13:18:01 +0200672 continue;
673
674 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
675 if (sdata->u.mgd.associated) {
676 associated = true;
Helmut Schaadf13cce2010-02-24 14:19:21 +0100677
Helmut Schaadf13cce2010-02-24 14:19:21 +0100678 if (!qdisc_all_tx_empty(sdata->dev)) {
679 tx_empty = false;
680 break;
681 }
Helmut Schaa142b9f52009-07-23 13:18:01 +0200682 }
683 }
684 }
685 mutex_unlock(&local->iflist_mtx);
686
Johannes Berg6ea0a692014-11-19 11:55:49 +0100687 scan_req = rcu_dereference_protected(local->scan_req,
688 lockdep_is_held(&local->mtx));
689
690 next_chan = scan_req->channels[local->scan_channel_idx];
Ben Greearb23b0252011-02-04 11:54:17 -0800691
Johannes Berg07ef03e2011-11-08 16:21:21 +0100692 /*
693 * we're currently scanning a different channel, let's
694 * see if we can scan another channel without interfering
695 * with the current traffic situation.
696 *
Stanislaw Gruszka3f892b62013-01-23 12:32:45 +0100697 * Keep good latency, do not stay off-channel more than 125 ms.
Johannes Berg07ef03e2011-11-08 16:21:21 +0100698 */
Helmut Schaadf13cce2010-02-24 14:19:21 +0100699
Johannes Berg07ef03e2011-11-08 16:21:21 +0100700 bad_latency = time_after(jiffies +
Stanislaw Gruszka3f892b62013-01-23 12:32:45 +0100701 ieee80211_scan_get_channel_time(next_chan),
702 local->leave_oper_channel_time + HZ / 8);
Helmut Schaadf13cce2010-02-24 14:19:21 +0100703
Sam Lefflercd2bb512012-10-11 21:03:35 -0700704 if (associated && !tx_empty) {
Johannes Berg6ea0a692014-11-19 11:55:49 +0100705 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
Sam Lefflercd2bb512012-10-11 21:03:35 -0700706 next_scan_state = SCAN_ABORT;
707 else
708 next_scan_state = SCAN_SUSPEND;
Stanislaw Gruszka3f892b62013-01-23 12:32:45 +0100709 } else if (associated && bad_latency) {
Sam Lefflercd2bb512012-10-11 21:03:35 -0700710 next_scan_state = SCAN_SUSPEND;
711 } else {
712 next_scan_state = SCAN_SET_CHANNEL;
713 }
714
715 local->next_scan_state = next_scan_state;
Helmut Schaa142b9f52009-07-23 13:18:01 +0200716
Helmut Schaa2fb3f022009-07-23 12:13:56 +0200717 *next_delay = 0;
Helmut Schaa2fb3f022009-07-23 12:13:56 +0200718}
719
720static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
721 unsigned long *next_delay)
722{
723 int skip;
724 struct ieee80211_channel *chan;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200725 enum nl80211_bss_scan_width oper_scan_width;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100726 struct cfg80211_scan_request *scan_req;
727
728 scan_req = rcu_dereference_protected(local->scan_req,
729 lockdep_is_held(&local->mtx));
Helmut Schaa2fb3f022009-07-23 12:13:56 +0200730
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200731 skip = 0;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100732 chan = scan_req->channels[local->scan_channel_idx];
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200733
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200734 local->scan_chandef.chan = chan;
735 local->scan_chandef.center_freq1 = chan->center_freq;
736 local->scan_chandef.center_freq2 = 0;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100737 switch (scan_req->scan_width) {
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200738 case NL80211_BSS_CHAN_WIDTH_5:
739 local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
740 break;
741 case NL80211_BSS_CHAN_WIDTH_10:
742 local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
743 break;
744 case NL80211_BSS_CHAN_WIDTH_20:
745 /* If scanning on oper channel, use whatever channel-type
746 * is currently in use.
747 */
748 oper_scan_width = cfg80211_chandef_to_scan_width(
749 &local->_oper_chandef);
750 if (chan == local->_oper_chandef.chan &&
Johannes Berg6ea0a692014-11-19 11:55:49 +0100751 oper_scan_width == scan_req->scan_width)
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200752 local->scan_chandef = local->_oper_chandef;
753 else
754 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
755 break;
756 }
Ben Greearb23b0252011-02-04 11:54:17 -0800757
Johannes Berg07ef03e2011-11-08 16:21:21 +0100758 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
759 skip = 1;
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200760
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200761 /* advance state machine to next channel/band */
762 local->scan_channel_idx++;
763
Helmut Schaa0ee9c132009-07-25 17:25:51 +0200764 if (skip) {
765 /* if we skip this channel return to the decision state */
766 local->next_scan_state = SCAN_DECISION;
Helmut Schaa2fb3f022009-07-23 12:13:56 +0200767 return;
Helmut Schaa0ee9c132009-07-25 17:25:51 +0200768 }
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200769
770 /*
771 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
772 * (which unfortunately doesn't say _why_ step a) is done,
773 * but it waits for the probe delay or until a frame is
774 * received - and the received frame would update the NAV).
775 * For now, we do not support waiting until a frame is
776 * received.
777 *
778 * In any case, it is not necessary for a passive scan.
779 */
Antonio Quartulli4e39cca2015-11-21 18:13:40 +0800780 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
781 !scan_req->n_ssids) {
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200782 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
Helmut Schaa977923b2009-07-23 12:14:20 +0200783 local->next_scan_state = SCAN_DECISION;
Helmut Schaa2fb3f022009-07-23 12:13:56 +0200784 return;
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200785 }
786
Helmut Schaa2fb3f022009-07-23 12:13:56 +0200787 /* active scan, send probes */
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200788 *next_delay = IEEE80211_PROBE_DELAY;
Helmut Schaa977923b2009-07-23 12:14:20 +0200789 local->next_scan_state = SCAN_SEND_PROBE;
Helmut Schaa7d3be3c2009-07-23 12:13:41 +0200790}
791
Johannes Berg07ef03e2011-11-08 16:21:21 +0100792static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
793 unsigned long *next_delay)
794{
795 /* switch back to the operating channel */
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200796 local->scan_chandef.chan = NULL;
Johannes Berg07ef03e2011-11-08 16:21:21 +0100797 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
798
Stanislaw Gruszkaaacde9e2012-12-20 14:41:18 +0100799 /* disable PS */
800 ieee80211_offchannel_return(local);
Johannes Berg07ef03e2011-11-08 16:21:21 +0100801
802 *next_delay = HZ / 5;
803 /* afterwards, resume scan & go to next channel */
804 local->next_scan_state = SCAN_RESUME;
805}
806
807static void ieee80211_scan_state_resume(struct ieee80211_local *local,
808 unsigned long *next_delay)
809{
Stanislaw Gruszkaaacde9e2012-12-20 14:41:18 +0100810 ieee80211_offchannel_stop_vifs(local);
Johannes Berg07ef03e2011-11-08 16:21:21 +0100811
812 if (local->ops->flush) {
Emmanuel Grumbach3b24f4c2015-01-07 15:42:39 +0200813 ieee80211_flush_queues(local, NULL, false);
Johannes Berg07ef03e2011-11-08 16:21:21 +0100814 *next_delay = 0;
815 } else
816 *next_delay = HZ / 10;
817
818 /* remember when we left the operating channel */
819 local->leave_oper_channel_time = jiffies;
820
821 /* advance to the next channel to be scanned */
Mohammed Shafi Shajakhande2ee842011-12-24 18:43:28 +0530822 local->next_scan_state = SCAN_SET_CHANNEL;
Johannes Berg07ef03e2011-11-08 16:21:21 +0100823}
824
Johannes Bergc2b13452008-09-11 00:01:55 +0200825void ieee80211_scan_work(struct work_struct *work)
Johannes Berg0a51b272008-09-08 17:44:25 +0200826{
827 struct ieee80211_local *local =
828 container_of(work, struct ieee80211_local, scan_work.work);
Johannes Bergd07bfd82011-03-07 15:48:41 +0100829 struct ieee80211_sub_if_data *sdata;
Johannes Berg6ea0a692014-11-19 11:55:49 +0100830 struct cfg80211_scan_request *scan_req;
Johannes Berg0a51b272008-09-08 17:44:25 +0200831 unsigned long next_delay = 0;
Eliad Peller8bd2a242013-12-05 11:21:27 +0200832 bool aborted;
Johannes Berg8789d452010-08-26 13:30:26 +0200833
Johannes Berga1699b72010-07-30 16:46:07 +0200834 mutex_lock(&local->mtx);
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +0200835
Luciano Coelho332ff7f2015-01-22 23:34:10 +0200836 if (!ieee80211_can_run_worker(local)) {
837 aborted = true;
838 goto out_complete;
839 }
840
Johannes Berge2fd5db2012-07-06 21:39:28 +0200841 sdata = rcu_dereference_protected(local->scan_sdata,
842 lockdep_is_held(&local->mtx));
Johannes Berg6ea0a692014-11-19 11:55:49 +0100843 scan_req = rcu_dereference_protected(local->scan_req,
844 lockdep_is_held(&local->mtx));
Johannes Bergd07bfd82011-03-07 15:48:41 +0100845
Ben Greear8a690672012-04-17 10:54:16 -0700846 /* When scanning on-channel, the first-callback means completed. */
847 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
848 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
849 goto out_complete;
850 }
851
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +0200852 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
853 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
854 goto out_complete;
Johannes Bergf3b85252009-04-23 16:01:47 +0200855 }
856
Johannes Berg6ea0a692014-11-19 11:55:49 +0100857 if (!sdata || !scan_req)
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +0200858 goto out;
859
Eliad Pellerff5db432014-11-12 10:08:29 +0200860 if (!local->scanning) {
Johannes Bergf3b85252009-04-23 16:01:47 +0200861 int rc;
862
Johannes Berg6ea0a692014-11-19 11:55:49 +0100863 RCU_INIT_POINTER(local->scan_req, NULL);
Monam Agarwal0c2bef462014-03-24 00:51:43 +0530864 RCU_INIT_POINTER(local->scan_sdata, NULL);
Johannes Bergf3b85252009-04-23 16:01:47 +0200865
Johannes Berg6ea0a692014-11-19 11:55:49 +0100866 rc = __ieee80211_start_scan(sdata, scan_req);
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +0200867 if (rc) {
Stanislaw Gruszka3aed49e2010-10-06 11:22:12 +0200868 /* need to complete scan in cfg80211 */
Johannes Berg6ea0a692014-11-19 11:55:49 +0100869 rcu_assign_pointer(local->scan_req, scan_req);
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +0200870 aborted = true;
871 goto out_complete;
872 } else
873 goto out;
Johannes Bergf3b85252009-04-23 16:01:47 +0200874 }
875
Johannes Berg5bc75722008-09-11 00:01:51 +0200876 /*
Helmut Schaaf502d092009-07-23 12:13:48 +0200877 * as long as no delay is required advance immediately
878 * without scheduling a new work
879 */
880 do {
Rajkumar Manoharanc29acf22011-05-14 09:43:28 +0530881 if (!ieee80211_sdata_running(sdata)) {
882 aborted = true;
883 goto out_complete;
884 }
885
Helmut Schaa977923b2009-07-23 12:14:20 +0200886 switch (local->next_scan_state) {
Helmut Schaa2fb3f022009-07-23 12:13:56 +0200887 case SCAN_DECISION:
Stanislaw Gruszkae229f842010-10-06 11:22:09 +0200888 /* if no more bands/channels left, complete scan */
Johannes Berg6ea0a692014-11-19 11:55:49 +0100889 if (local->scan_channel_idx >= scan_req->n_channels) {
Stanislaw Gruszkae229f842010-10-06 11:22:09 +0200890 aborted = false;
891 goto out_complete;
892 }
893 ieee80211_scan_state_decision(local, &next_delay);
Helmut Schaaf502d092009-07-23 12:13:48 +0200894 break;
Helmut Schaa2fb3f022009-07-23 12:13:56 +0200895 case SCAN_SET_CHANNEL:
896 ieee80211_scan_state_set_channel(local, &next_delay);
897 break;
Helmut Schaaf502d092009-07-23 12:13:48 +0200898 case SCAN_SEND_PROBE:
899 ieee80211_scan_state_send_probe(local, &next_delay);
900 break;
Johannes Berg07ef03e2011-11-08 16:21:21 +0100901 case SCAN_SUSPEND:
902 ieee80211_scan_state_suspend(local, &next_delay);
Helmut Schaa142b9f52009-07-23 13:18:01 +0200903 break;
Johannes Berg07ef03e2011-11-08 16:21:21 +0100904 case SCAN_RESUME:
905 ieee80211_scan_state_resume(local, &next_delay);
Helmut Schaa142b9f52009-07-23 13:18:01 +0200906 break;
Sam Lefflercd2bb512012-10-11 21:03:35 -0700907 case SCAN_ABORT:
908 aborted = true;
909 goto out_complete;
Helmut Schaaf502d092009-07-23 12:13:48 +0200910 }
911 } while (next_delay == 0);
Johannes Berg0a51b272008-09-08 17:44:25 +0200912
Luis R. Rodriguez42935ec2009-07-29 20:08:07 -0400913 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
Johannes Bergd07bfd82011-03-07 15:48:41 +0100914 goto out;
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +0200915
916out_complete:
Eliad Peller8bd2a242013-12-05 11:21:27 +0200917 __ieee80211_scan_completed(&local->hw, aborted);
Stanislaw Gruszka259b62e2010-10-06 11:22:08 +0200918out:
919 mutex_unlock(&local->mtx);
Johannes Berg0a51b272008-09-08 17:44:25 +0200920}
921
Johannes Bergc2b13452008-09-11 00:01:55 +0200922int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
Johannes Berg2a519312009-02-10 21:25:55 +0100923 struct cfg80211_scan_request *req)
Johannes Berg0a51b272008-09-08 17:44:25 +0200924{
Johannes Bergf3b85252009-04-23 16:01:47 +0200925 int res;
926
Johannes Berga1699b72010-07-30 16:46:07 +0200927 mutex_lock(&sdata->local->mtx);
Johannes Bergf3b85252009-04-23 16:01:47 +0200928 res = __ieee80211_start_scan(sdata, req);
Johannes Berga1699b72010-07-30 16:46:07 +0200929 mutex_unlock(&sdata->local->mtx);
Johannes Bergf3b85252009-04-23 16:01:47 +0200930
931 return res;
932}
933
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +0100934int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
935 const u8 *ssid, u8 ssid_len,
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +0100936 struct ieee80211_channel **channels,
937 unsigned int n_channels,
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200938 enum nl80211_bss_scan_width scan_width)
Johannes Bergf3b85252009-04-23 16:01:47 +0200939{
Johannes Berg0a51b272008-09-08 17:44:25 +0200940 struct ieee80211_local *local = sdata->local;
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +0100941 int ret = -EBUSY, i, n_ch = 0;
Gertjan van Wingerdefb63bc42010-06-20 20:28:07 +0200942 enum ieee80211_band band;
Johannes Berg0a51b272008-09-08 17:44:25 +0200943
Johannes Berga1699b72010-07-30 16:46:07 +0200944 mutex_lock(&local->mtx);
Johannes Berg2a519312009-02-10 21:25:55 +0100945
Johannes Bergf3b85252009-04-23 16:01:47 +0200946 /* busy scanning */
947 if (local->scan_req)
948 goto unlock;
Johannes Berg2a519312009-02-10 21:25:55 +0100949
Johannes Bergbe4a4b62010-05-03 08:49:48 +0200950 /* fill internal scan request */
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +0100951 if (!channels) {
952 int max_n;
Johannes Bergbe4a4b62010-05-03 08:49:48 +0200953
954 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
955 if (!local->hw.wiphy->bands[band])
956 continue;
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +0100957
958 max_n = local->hw.wiphy->bands[band]->n_channels;
959 for (i = 0; i < max_n; i++) {
960 struct ieee80211_channel *tmp_ch =
Johannes Bergbe4a4b62010-05-03 08:49:48 +0200961 &local->hw.wiphy->bands[band]->channels[i];
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +0100962
Luis R. Rodriguez8fe02e12013-10-21 19:22:25 +0200963 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +0100964 IEEE80211_CHAN_DISABLED))
965 continue;
966
967 local->int_scan_req->channels[n_ch] = tmp_ch;
968 n_ch++;
Johannes Bergbe4a4b62010-05-03 08:49:48 +0200969 }
970 }
971
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +0100972 if (WARN_ON_ONCE(n_ch == 0))
973 goto unlock;
974
975 local->int_scan_req->n_channels = n_ch;
Johannes Bergbe4a4b62010-05-03 08:49:48 +0200976 } else {
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +0100977 for (i = 0; i < n_channels; i++) {
978 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
979 IEEE80211_CHAN_DISABLED))
980 continue;
981
982 local->int_scan_req->channels[n_ch] = channels[i];
983 n_ch++;
984 }
985
986 if (WARN_ON_ONCE(n_ch == 0))
Stanislaw Gruszka34bcf712012-12-11 10:48:23 +0100987 goto unlock;
988
Janusz.Dziedzic@tieto.com76bed0f2015-03-20 06:37:00 +0100989 local->int_scan_req->n_channels = n_ch;
Johannes Bergbe4a4b62010-05-03 08:49:48 +0200990 }
991
992 local->int_scan_req->ssids = &local->scan_ssid;
993 local->int_scan_req->n_ssids = 1;
Simon Wunderlich7ca15a02013-07-08 16:55:56 +0200994 local->int_scan_req->scan_width = scan_width;
Johannes Berg5ba63532009-08-07 17:54:07 +0200995 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
996 local->int_scan_req->ssids[0].ssid_len = ssid_len;
Johannes Berg2a519312009-02-10 21:25:55 +0100997
Johannes Berg5ba63532009-08-07 17:54:07 +0200998 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
Johannes Bergf3b85252009-04-23 16:01:47 +0200999 unlock:
Johannes Berga1699b72010-07-30 16:46:07 +02001000 mutex_unlock(&local->mtx);
Johannes Bergf3b85252009-04-23 16:01:47 +02001001 return ret;
Johannes Berg0a51b272008-09-08 17:44:25 +02001002}
Johannes Berg5bb644a2009-05-17 11:40:42 +02001003
Stanislaw Gruszka4136c422010-10-06 11:22:10 +02001004/*
1005 * Only call this function when a scan can't be queued -- under RTNL.
1006 */
Johannes Berg5bb644a2009-05-17 11:40:42 +02001007void ieee80211_scan_cancel(struct ieee80211_local *local)
1008{
Johannes Berg5bb644a2009-05-17 11:40:42 +02001009 /*
Eliad Pellerb8564392011-06-13 12:47:30 +03001010 * We are canceling software scan, or deferred scan that was not
Stanislaw Gruszka4136c422010-10-06 11:22:10 +02001011 * yet really started (see __ieee80211_start_scan ).
1012 *
1013 * Regarding hardware scan:
1014 * - we can not call __ieee80211_scan_completed() as when
1015 * SCAN_HW_SCANNING bit is set this function change
1016 * local->hw_scan_req to operate on 5G band, what race with
1017 * driver which can use local->hw_scan_req
1018 *
1019 * - we can not cancel scan_work since driver can schedule it
1020 * by ieee80211_scan_completed(..., true) to finish scan
1021 *
Eliad Pellerb8564392011-06-13 12:47:30 +03001022 * Hence we only call the cancel_hw_scan() callback, but the low-level
1023 * driver is still responsible for calling ieee80211_scan_completed()
1024 * after the scan was completed/aborted.
Johannes Berg5bb644a2009-05-17 11:40:42 +02001025 */
Stanislaw Gruszka4136c422010-10-06 11:22:10 +02001026
Johannes Berga1699b72010-07-30 16:46:07 +02001027 mutex_lock(&local->mtx);
Eliad Pellerb8564392011-06-13 12:47:30 +03001028 if (!local->scan_req)
1029 goto out;
1030
Emmanuel Grumbacha7540552013-09-16 11:12:07 +03001031 /*
1032 * We have a scan running and the driver already reported completion,
1033 * but the worker hasn't run yet or is stuck on the mutex - mark it as
1034 * cancelled.
1035 */
1036 if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1037 test_bit(SCAN_COMPLETED, &local->scanning)) {
1038 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1039 goto out;
1040 }
1041
Eliad Pellerb8564392011-06-13 12:47:30 +03001042 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
Emmanuel Grumbacha7540552013-09-16 11:12:07 +03001043 /*
1044 * Make sure that __ieee80211_scan_completed doesn't trigger a
1045 * scan on another band.
1046 */
1047 set_bit(SCAN_HW_CANCELLED, &local->scanning);
Eliad Pellerb8564392011-06-13 12:47:30 +03001048 if (local->ops->cancel_hw_scan)
Johannes Berge2fd5db2012-07-06 21:39:28 +02001049 drv_cancel_hw_scan(local,
1050 rcu_dereference_protected(local->scan_sdata,
1051 lockdep_is_held(&local->mtx)));
Eliad Pellerb8564392011-06-13 12:47:30 +03001052 goto out;
Stanislaw Gruszka4136c422010-10-06 11:22:10 +02001053 }
Eliad Pellerb8564392011-06-13 12:47:30 +03001054
1055 /*
1056 * If the work is currently running, it must be blocked on
1057 * the mutex, but we'll set scan_sdata = NULL and it'll
1058 * simply exit once it acquires the mutex.
1059 */
1060 cancel_delayed_work(&local->scan_work);
1061 /* and clean up */
Eliad Peller8bd2a242013-12-05 11:21:27 +02001062 __ieee80211_scan_completed(&local->hw, true);
Eliad Pellerb8564392011-06-13 12:47:30 +03001063out:
Johannes Bergd07bfd82011-03-07 15:48:41 +01001064 mutex_unlock(&local->mtx);
Johannes Berg5bb644a2009-05-17 11:40:42 +02001065}
Luciano Coelho79f460c2011-05-11 17:09:36 +03001066
David Spinadeld43c6b62013-12-08 21:48:57 +02001067int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1068 struct cfg80211_sched_scan_request *req)
Luciano Coelho79f460c2011-05-11 17:09:36 +03001069{
1070 struct ieee80211_local *local = sdata->local;
David Spinadel633e2712014-02-06 16:15:23 +02001071 struct ieee80211_scan_ies sched_scan_ies = {};
Simon Wunderlich2103dec2013-07-08 16:55:53 +02001072 struct cfg80211_chan_def chandef;
David Spinadel633e2712014-02-06 16:15:23 +02001073 int ret, i, iebufsz, num_bands = 0;
1074 u32 rate_masks[IEEE80211_NUM_BANDS] = {};
1075 u8 bands_used = 0;
1076 u8 *ie;
1077 size_t len;
Johannes Bergc604b9f2012-11-29 12:45:18 +01001078
David Spinadele4dcbb32014-02-11 13:45:41 +02001079 iebufsz = local->scan_ies_len + req->ie_len;
Luciano Coelho79f460c2011-05-11 17:09:36 +03001080
David Spinadeld43c6b62013-12-08 21:48:57 +02001081 lockdep_assert_held(&local->mtx);
Luciano Coelho79f460c2011-05-11 17:09:36 +03001082
David Spinadeld43c6b62013-12-08 21:48:57 +02001083 if (!local->ops->sched_scan_start)
1084 return -ENOTSUPP;
Luciano Coelho79f460c2011-05-11 17:09:36 +03001085
1086 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
David Spinadel633e2712014-02-06 16:15:23 +02001087 if (local->hw.wiphy->bands[i]) {
1088 bands_used |= BIT(i);
1089 rate_masks[i] = (u32) -1;
1090 num_bands++;
Luciano Coelho79f460c2011-05-11 17:09:36 +03001091 }
Luciano Coelho79f460c2011-05-11 17:09:36 +03001092 }
1093
David Spinadel633e2712014-02-06 16:15:23 +02001094 ie = kzalloc(num_bands * iebufsz, GFP_KERNEL);
1095 if (!ie) {
1096 ret = -ENOMEM;
1097 goto out;
1098 }
1099
1100 ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
1101
1102 len = ieee80211_build_preq_ies(local, ie, num_bands * iebufsz,
1103 &sched_scan_ies, req->ie,
1104 req->ie_len, bands_used,
1105 rate_masks, &chandef);
1106
Johannes Berg30dd3ed2012-09-04 19:15:01 +02001107 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
David Spinadeld43c6b62013-12-08 21:48:57 +02001108 if (ret == 0) {
Johannes Berg5260a5b2012-07-06 21:55:11 +02001109 rcu_assign_pointer(local->sched_scan_sdata, sdata);
Johannes Berg6ea0a692014-11-19 11:55:49 +01001110 rcu_assign_pointer(local->sched_scan_req, req);
David Spinadeld43c6b62013-12-08 21:48:57 +02001111 }
Luciano Coelho79f460c2011-05-11 17:09:36 +03001112
David Spinadel633e2712014-02-06 16:15:23 +02001113 kfree(ie);
David Spinadeld43c6b62013-12-08 21:48:57 +02001114
David Spinadel633e2712014-02-06 16:15:23 +02001115out:
David Spinadeld43c6b62013-12-08 21:48:57 +02001116 if (ret) {
1117 /* Clean in case of failure after HW restart or upon resume. */
Monam Agarwal0c2bef462014-03-24 00:51:43 +05301118 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
Johannes Berg6ea0a692014-11-19 11:55:49 +01001119 RCU_INIT_POINTER(local->sched_scan_req, NULL);
David Spinadeld43c6b62013-12-08 21:48:57 +02001120 }
1121
1122 return ret;
1123}
1124
1125int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1126 struct cfg80211_sched_scan_request *req)
1127{
1128 struct ieee80211_local *local = sdata->local;
1129 int ret;
1130
1131 mutex_lock(&local->mtx);
1132
1133 if (rcu_access_pointer(local->sched_scan_sdata)) {
1134 mutex_unlock(&local->mtx);
1135 return -EBUSY;
1136 }
1137
1138 ret = __ieee80211_request_sched_scan_start(sdata, req);
1139
Johannes Berg5260a5b2012-07-06 21:55:11 +02001140 mutex_unlock(&local->mtx);
Luciano Coelho79f460c2011-05-11 17:09:36 +03001141 return ret;
1142}
1143
Eliad Peller0d440ea2015-10-25 10:59:33 +02001144int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
Luciano Coelho79f460c2011-05-11 17:09:36 +03001145{
Eliad Peller0d440ea2015-10-25 10:59:33 +02001146 struct ieee80211_sub_if_data *sched_scan_sdata;
1147 int ret = -ENOENT;
Luciano Coelho79f460c2011-05-11 17:09:36 +03001148
Johannes Berg5260a5b2012-07-06 21:55:11 +02001149 mutex_lock(&local->mtx);
Luciano Coelho79f460c2011-05-11 17:09:36 +03001150
1151 if (!local->ops->sched_scan_stop) {
1152 ret = -ENOTSUPP;
1153 goto out;
1154 }
1155
David Spinadeld43c6b62013-12-08 21:48:57 +02001156 /* We don't want to restart sched scan anymore. */
Johannes Berg6ea0a692014-11-19 11:55:49 +01001157 RCU_INIT_POINTER(local->sched_scan_req, NULL);
David Spinadeld43c6b62013-12-08 21:48:57 +02001158
Eliad Peller0d440ea2015-10-25 10:59:33 +02001159 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1160 lockdep_is_held(&local->mtx));
1161 if (sched_scan_sdata) {
1162 ret = drv_sched_scan_stop(local, sched_scan_sdata);
Alexander Bondar71228a12014-03-16 10:49:54 +02001163 if (!ret)
Andreea-Cristina Bernatad053a92014-08-22 16:14:49 +03001164 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
Alexander Bondar71228a12014-03-16 10:49:54 +02001165 }
Luciano Coelho79f460c2011-05-11 17:09:36 +03001166out:
Johannes Berg5260a5b2012-07-06 21:55:11 +02001167 mutex_unlock(&local->mtx);
Luciano Coelho79f460c2011-05-11 17:09:36 +03001168
1169 return ret;
1170}
1171
1172void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1173{
1174 struct ieee80211_local *local = hw_to_local(hw);
1175
1176 trace_api_sched_scan_results(local);
1177
1178 cfg80211_sched_scan_results(hw->wiphy);
1179}
1180EXPORT_SYMBOL(ieee80211_sched_scan_results);
1181
Johannes Bergf6837ba2014-04-30 14:19:04 +02001182void ieee80211_sched_scan_end(struct ieee80211_local *local)
Luciano Coelho85a99942011-05-12 16:28:29 +03001183{
Luciano Coelho85a99942011-05-12 16:28:29 +03001184 mutex_lock(&local->mtx);
1185
Johannes Berg5260a5b2012-07-06 21:55:11 +02001186 if (!rcu_access_pointer(local->sched_scan_sdata)) {
Luciano Coelho85a99942011-05-12 16:28:29 +03001187 mutex_unlock(&local->mtx);
1188 return;
1189 }
1190
Monam Agarwal0c2bef462014-03-24 00:51:43 +05301191 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
Luciano Coelho85a99942011-05-12 16:28:29 +03001192
David Spinadeld43c6b62013-12-08 21:48:57 +02001193 /* If sched scan was aborted by the driver. */
Johannes Berg6ea0a692014-11-19 11:55:49 +01001194 RCU_INIT_POINTER(local->sched_scan_req, NULL);
David Spinadeld43c6b62013-12-08 21:48:57 +02001195
Luciano Coelho85a99942011-05-12 16:28:29 +03001196 mutex_unlock(&local->mtx);
1197
1198 cfg80211_sched_scan_stopped(local->hw.wiphy);
1199}
1200
Johannes Bergf6837ba2014-04-30 14:19:04 +02001201void ieee80211_sched_scan_stopped_work(struct work_struct *work)
1202{
1203 struct ieee80211_local *local =
1204 container_of(work, struct ieee80211_local,
1205 sched_scan_stopped_work);
1206
1207 ieee80211_sched_scan_end(local);
1208}
1209
Luciano Coelho79f460c2011-05-11 17:09:36 +03001210void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1211{
1212 struct ieee80211_local *local = hw_to_local(hw);
1213
1214 trace_api_sched_scan_stopped(local);
1215
Johannes Berg18db5942013-11-06 10:34:36 +01001216 schedule_work(&local->sched_scan_stopped_work);
Luciano Coelho79f460c2011-05-11 17:09:36 +03001217}
1218EXPORT_SYMBOL(ieee80211_sched_scan_stopped);