Commit | Line | Data |
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0a51b27e | 1 | /* |
5484e237 JB |
2 | * Scanning implementation |
3 | * | |
0a51b27e JB |
4 | * 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> | |
74d803b6 | 9 | * Copyright 2013-2015 Intel Mobile Communications GmbH |
40b0bd24 | 10 | * Copyright 2016-2017 Intel Deutschland GmbH |
0a51b27e JB |
11 | * |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | */ | |
16 | ||
0a51b27e | 17 | #include <linux/if_arp.h> |
888d04df | 18 | #include <linux/etherdevice.h> |
078e1e60 | 19 | #include <linux/rtnetlink.h> |
df13cce5 | 20 | #include <net/sch_generic.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
bc3b2d7f | 22 | #include <linux/export.h> |
0a51b27e | 23 | #include <net/mac80211.h> |
0a51b27e JB |
24 | |
25 | #include "ieee80211_i.h" | |
24487981 | 26 | #include "driver-ops.h" |
5484e237 | 27 | #include "mesh.h" |
0a51b27e JB |
28 | |
29 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
30 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
3f892b61 | 31 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) |
0a51b27e | 32 | |
5484e237 | 33 | void ieee80211_rx_bss_put(struct ieee80211_local *local, |
c2b13452 | 34 | struct ieee80211_bss *bss) |
5484e237 | 35 | { |
0c1ad2ca JB |
36 | if (!bss) |
37 | return; | |
5b112d3d JB |
38 | cfg80211_put_bss(local->hw.wiphy, |
39 | container_of((void *)bss, struct cfg80211_bss, priv)); | |
5484e237 JB |
40 | } |
41 | ||
ab13315a KV |
42 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
43 | { | |
44 | u8 qos_info; | |
45 | ||
46 | if (elems->wmm_info && elems->wmm_info_len == 7 | |
47 | && elems->wmm_info[5] == 1) | |
48 | qos_info = elems->wmm_info[6]; | |
49 | else if (elems->wmm_param && elems->wmm_param_len == 24 | |
50 | && elems->wmm_param[5] == 1) | |
51 | qos_info = elems->wmm_param[6]; | |
52 | else | |
53 | /* no valid wmm information or parameter element found */ | |
54 | return false; | |
55 | ||
56 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; | |
57 | } | |
58 | ||
c2b13452 | 59 | struct ieee80211_bss * |
5484e237 JB |
60 | ieee80211_bss_info_update(struct ieee80211_local *local, |
61 | struct ieee80211_rx_status *rx_status, | |
d45c4172 | 62 | struct ieee80211_mgmt *mgmt, size_t len, |
5484e237 | 63 | struct ieee802_11_elems *elems, |
d45c4172 | 64 | struct ieee80211_channel *channel) |
5484e237 | 65 | { |
d45c4172 | 66 | bool beacon = ieee80211_is_beacon(mgmt->frame_control); |
0c1ad2ca | 67 | struct cfg80211_bss *cbss; |
c2b13452 | 68 | struct ieee80211_bss *bss; |
f0b058b6 | 69 | int clen, srlen; |
162dd6a7 JB |
70 | struct cfg80211_inform_bss bss_meta = { |
71 | .boottime_ns = rx_status->boottime_ns, | |
72 | }; | |
74d803b6 | 73 | bool signal_valid; |
7947d3e0 | 74 | struct ieee80211_sub_if_data *scan_sdata; |
2a519311 | 75 | |
1ad22fb5 T |
76 | if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL) |
77 | bss_meta.signal = 0; /* invalid signal indication */ | |
78 | else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) | |
61f6bba0 | 79 | bss_meta.signal = rx_status->signal * 100; |
30686bf7 | 80 | else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) |
61f6bba0 | 81 | bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 82 | |
61f6bba0 | 83 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20; |
da6a4352 | 84 | if (rx_status->bw == RATE_INFO_BW_5) |
61f6bba0 | 85 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5; |
da6a4352 | 86 | else if (rx_status->bw == RATE_INFO_BW_10) |
61f6bba0 | 87 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10; |
7ca15a0a | 88 | |
61f6bba0 | 89 | bss_meta.chan = channel; |
7947d3e0 AS |
90 | |
91 | rcu_read_lock(); | |
92 | scan_sdata = rcu_dereference(local->scan_sdata); | |
93 | if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION && | |
94 | scan_sdata->vif.bss_conf.assoc && | |
95 | ieee80211_have_rx_timestamp(rx_status)) { | |
96 | bss_meta.parent_tsf = | |
97 | ieee80211_calculate_rx_timestamp(local, rx_status, | |
98 | len + FCS_LEN, 24); | |
99 | ether_addr_copy(bss_meta.parent_bssid, | |
100 | scan_sdata->vif.bss_conf.bssid); | |
101 | } | |
102 | rcu_read_unlock(); | |
103 | ||
61f6bba0 JB |
104 | cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, |
105 | mgmt, len, GFP_ATOMIC); | |
0c1ad2ca | 106 | if (!cbss) |
00d3f14c | 107 | return NULL; |
74d803b6 SS |
108 | /* In case the signal is invalid update the status */ |
109 | signal_valid = abs(channel->center_freq - cbss->channel->center_freq) | |
110 | <= local->hw.wiphy->max_adj_channel_rssi_comp; | |
111 | if (!signal_valid) | |
112 | rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; | |
00d3f14c | 113 | |
0c1ad2ca | 114 | bss = (void *)cbss->priv; |
5484e237 | 115 | |
ef429dad JB |
116 | if (beacon) |
117 | bss->device_ts_beacon = rx_status->device_timestamp; | |
118 | else | |
119 | bss->device_ts_presp = rx_status->device_timestamp; | |
8c358bcd | 120 | |
fcff4f10 PS |
121 | if (elems->parse_error) { |
122 | if (beacon) | |
123 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
124 | else | |
125 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
126 | } else { | |
127 | if (beacon) | |
128 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
129 | else | |
130 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
131 | } | |
132 | ||
5484e237 | 133 | /* save the ERP value so that it is available at association time */ |
1946bed9 JB |
134 | if (elems->erp_info && (!elems->parse_error || |
135 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 136 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 137 | bss->has_erp_value = true; |
fcff4f10 PS |
138 | if (!elems->parse_error) |
139 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
140 | } |
141 | ||
f0b058b6 | 142 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
143 | if (!elems->parse_error || |
144 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
145 | srlen = 0; | |
146 | if (elems->supp_rates) { | |
147 | clen = IEEE80211_MAX_SUPP_RATES; | |
148 | if (clen > elems->supp_rates_len) | |
149 | clen = elems->supp_rates_len; | |
150 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
151 | srlen += clen; | |
152 | } | |
153 | if (elems->ext_supp_rates) { | |
154 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
155 | if (clen > elems->ext_supp_rates_len) | |
156 | clen = elems->ext_supp_rates_len; | |
157 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
158 | clen); | |
159 | srlen += clen; | |
160 | } | |
161 | if (srlen) { | |
162 | bss->supp_rates_len = srlen; | |
163 | if (!elems->parse_error) | |
164 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
165 | } | |
5484e237 | 166 | } |
5484e237 | 167 | |
fcff4f10 PS |
168 | if (!elems->parse_error || |
169 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
170 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
171 | bss->uapsd_supported = is_uapsd_supported(elems); | |
172 | if (!elems->parse_error) | |
173 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
174 | } | |
5484e237 | 175 | |
817cee76 AB |
176 | if (beacon) { |
177 | struct ieee80211_supported_band *sband = | |
178 | local->hw.wiphy->bands[rx_status->band]; | |
da6a4352 JB |
179 | if (!(rx_status->encoding == RX_ENC_HT) && |
180 | !(rx_status->encoding == RX_ENC_VHT)) | |
817cee76 AB |
181 | bss->beacon_rate = |
182 | &sband->bitrates[rx_status->rate_idx]; | |
183 | } | |
184 | ||
5484e237 JB |
185 | return bss; |
186 | } | |
0a51b27e | 187 | |
40b0bd24 RZ |
188 | static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata, |
189 | u32 scan_flags, const u8 *da) | |
190 | { | |
191 | if (!sdata) | |
192 | return false; | |
193 | /* accept broadcast for OCE */ | |
194 | if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP && | |
195 | is_broadcast_ether_addr(da)) | |
196 | return true; | |
197 | if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR) | |
198 | return true; | |
199 | return ether_addr_equal(da, sdata->vif.addr); | |
200 | } | |
201 | ||
d48b2968 | 202 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 203 | { |
f1d58c25 | 204 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
205 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
206 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 207 | struct ieee80211_bss *bss; |
98c8fccf JB |
208 | u8 *elements; |
209 | struct ieee80211_channel *channel; | |
210 | size_t baselen; | |
98c8fccf JB |
211 | struct ieee802_11_elems elems; |
212 | ||
d48b2968 JB |
213 | if (skb->len < 24 || |
214 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
215 | !ieee80211_is_beacon(mgmt->frame_control))) | |
216 | return; | |
98c8fccf | 217 | |
d48b2968 JB |
218 | sdata1 = rcu_dereference(local->scan_sdata); |
219 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 220 | |
d48b2968 JB |
221 | if (likely(!sdata1 && !sdata2)) |
222 | return; | |
98c8fccf | 223 | |
d48b2968 | 224 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
a344d677 JB |
225 | struct cfg80211_scan_request *scan_req; |
226 | struct cfg80211_sched_scan_request *sched_scan_req; | |
40b0bd24 | 227 | u32 scan_req_flags = 0, sched_scan_req_flags = 0; |
a344d677 JB |
228 | |
229 | scan_req = rcu_dereference(local->scan_req); | |
230 | sched_scan_req = rcu_dereference(local->sched_scan_req); | |
231 | ||
40b0bd24 RZ |
232 | if (scan_req) |
233 | scan_req_flags = scan_req->flags; | |
234 | ||
235 | if (sched_scan_req) | |
236 | sched_scan_req_flags = sched_scan_req->flags; | |
237 | ||
238 | /* ignore ProbeResp to foreign address or non-bcast (OCE) | |
239 | * unless scanning with randomised address | |
a344d677 | 240 | */ |
40b0bd24 RZ |
241 | if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags, |
242 | mgmt->da) && | |
243 | !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags, | |
244 | mgmt->da)) | |
d48b2968 | 245 | return; |
98c8fccf | 246 | |
98c8fccf JB |
247 | elements = mgmt->u.probe_resp.variable; |
248 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
249 | } else { | |
98c8fccf JB |
250 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
251 | elements = mgmt->u.beacon.variable; | |
252 | } | |
253 | ||
98c8fccf | 254 | if (baselen > skb->len) |
d48b2968 | 255 | return; |
98c8fccf | 256 | |
b2e506bf | 257 | ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); |
98c8fccf | 258 | |
0172bb75 | 259 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
260 | |
261 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 262 | return; |
98c8fccf | 263 | |
d48b2968 | 264 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 265 | mgmt, skb->len, &elems, |
d45c4172 | 266 | channel); |
d048e503 | 267 | if (bss) |
d48b2968 | 268 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
269 | } |
270 | ||
2103dec1 SW |
271 | static void |
272 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, | |
273 | enum nl80211_bss_scan_width scan_width) | |
274 | { | |
275 | memset(chandef, 0, sizeof(*chandef)); | |
276 | switch (scan_width) { | |
277 | case NL80211_BSS_CHAN_WIDTH_5: | |
278 | chandef->width = NL80211_CHAN_WIDTH_5; | |
279 | break; | |
280 | case NL80211_BSS_CHAN_WIDTH_10: | |
281 | chandef->width = NL80211_CHAN_WIDTH_10; | |
282 | break; | |
283 | default: | |
284 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
285 | break; | |
286 | } | |
287 | } | |
288 | ||
4d36ec58 JB |
289 | /* return false if no more work */ |
290 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
291 | { | |
6ea0a69c | 292 | struct cfg80211_scan_request *req; |
2103dec1 | 293 | struct cfg80211_chan_def chandef; |
c56ef672 | 294 | u8 bands_used = 0; |
4d36ec58 JB |
295 | int i, ielen, n_chans; |
296 | ||
6ea0a69c JB |
297 | req = rcu_dereference_protected(local->scan_req, |
298 | lockdep_is_held(&local->mtx)); | |
299 | ||
a754055a EG |
300 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
301 | return false; | |
302 | ||
30686bf7 | 303 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
4d36ec58 | 304 | for (i = 0; i < req->n_channels; i++) { |
c56ef672 DS |
305 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
306 | bands_used |= BIT(req->channels[i]->band); | |
307 | } | |
308 | ||
309 | n_chans = req->n_channels; | |
310 | } else { | |
311 | do { | |
57fbcce3 | 312 | if (local->hw_scan_band == NUM_NL80211_BANDS) |
c56ef672 DS |
313 | return false; |
314 | ||
315 | n_chans = 0; | |
316 | ||
317 | for (i = 0; i < req->n_channels; i++) { | |
318 | if (req->channels[i]->band != | |
319 | local->hw_scan_band) | |
320 | continue; | |
321 | local->hw_scan_req->req.channels[n_chans] = | |
4d36ec58 JB |
322 | req->channels[i]; |
323 | n_chans++; | |
c56ef672 | 324 | bands_used |= BIT(req->channels[i]->band); |
4d36ec58 | 325 | } |
4d36ec58 | 326 | |
c56ef672 DS |
327 | local->hw_scan_band++; |
328 | } while (!n_chans); | |
329 | } | |
4d36ec58 | 330 | |
c56ef672 | 331 | local->hw_scan_req->req.n_channels = n_chans; |
2103dec1 | 332 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
4d36ec58 | 333 | |
c56ef672 DS |
334 | ielen = ieee80211_build_preq_ies(local, |
335 | (u8 *)local->hw_scan_req->req.ie, | |
c604b9f2 | 336 | local->hw_scan_ies_bufsize, |
c56ef672 DS |
337 | &local->hw_scan_req->ies, |
338 | req->ie, req->ie_len, | |
339 | bands_used, req->rates, &chandef); | |
340 | local->hw_scan_req->req.ie_len = ielen; | |
341 | local->hw_scan_req->req.no_cck = req->no_cck; | |
a344d677 JB |
342 | ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); |
343 | ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, | |
344 | req->mac_addr_mask); | |
e345f44f | 345 | ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); |
4d36ec58 JB |
346 | |
347 | return true; | |
348 | } | |
349 | ||
8bd2a248 | 350 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
351 | { |
352 | struct ieee80211_local *local = hw_to_local(hw); | |
8bd2a248 | 353 | bool hw_scan = local->ops->hw_scan; |
a2b70e83 | 354 | bool was_scanning = local->scanning; |
6ea0a69c | 355 | struct cfg80211_scan_request *scan_req; |
a344d677 | 356 | struct ieee80211_sub_if_data *scan_sdata; |
4fa11ec7 | 357 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 358 | |
e229f844 | 359 | lockdep_assert_held(&local->mtx); |
5bc75728 | 360 | |
6d3560d4 JB |
361 | /* |
362 | * It's ok to abort a not-yet-running scan (that | |
363 | * we have one at all will be verified by checking | |
364 | * local->scan_req next), but not to complete it | |
365 | * successfully. | |
366 | */ | |
367 | if (WARN_ON(!local->scanning && !aborted)) | |
368 | aborted = true; | |
5bc75728 | 369 | |
e229f844 | 370 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 371 | return; |
de95a54b | 372 | |
c56ef672 | 373 | if (hw_scan && !aborted && |
30686bf7 | 374 | !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && |
c56ef672 | 375 | ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
376 | int rc; |
377 | ||
378 | rc = drv_hw_scan(local, | |
379 | rcu_dereference_protected(local->scan_sdata, | |
380 | lockdep_is_held(&local->mtx)), | |
381 | local->hw_scan_req); | |
382 | ||
6eb11a9a | 383 | if (rc == 0) |
d07bfd8b | 384 | return; |
7947d3e0 | 385 | |
7d10f6b1 JB |
386 | /* HW scan failed and is going to be reported as aborted, |
387 | * so clear old scan info. | |
7947d3e0 AS |
388 | */ |
389 | memset(&local->scan_info, 0, sizeof(local->scan_info)); | |
7d10f6b1 | 390 | aborted = true; |
4d36ec58 JB |
391 | } |
392 | ||
393 | kfree(local->hw_scan_req); | |
394 | local->hw_scan_req = NULL; | |
f3b85252 | 395 | |
6ea0a69c JB |
396 | scan_req = rcu_dereference_protected(local->scan_req, |
397 | lockdep_is_held(&local->mtx)); | |
398 | ||
1d76250b | 399 | if (scan_req != local->int_scan_req) { |
7947d3e0 AS |
400 | local->scan_info.aborted = aborted; |
401 | cfg80211_scan_done(scan_req, &local->scan_info); | |
1d76250b | 402 | } |
6ea0a69c | 403 | RCU_INIT_POINTER(local->scan_req, NULL); |
a344d677 JB |
404 | |
405 | scan_sdata = rcu_dereference_protected(local->scan_sdata, | |
406 | lockdep_is_held(&local->mtx)); | |
0c2bef46 | 407 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
2a519311 | 408 | |
fbe9c429 | 409 | local->scanning = 0; |
7ca15a0a | 410 | local->scan_chandef.chan = NULL; |
f3b85252 | 411 | |
07ef03ee JB |
412 | /* Set power back to normal operating levels. */ |
413 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 414 | |
8bd2a248 | 415 | if (!hw_scan) { |
e229f844 | 416 | ieee80211_configure_filter(local); |
a344d677 | 417 | drv_sw_scan_complete(local, scan_sdata); |
aacde9ee | 418 | ieee80211_offchannel_return(local); |
e229f844 | 419 | } |
0a51b27e | 420 | |
5cff20e6 | 421 | ieee80211_recalc_idle(local); |
e229f844 | 422 | |
0a51b27e | 423 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 424 | ieee80211_ibss_notify_scan_completed(local); |
4fa11ec7 SK |
425 | |
426 | /* Requeue all the work that might have been ignored while | |
427 | * the scan was in progress; if there was none this will | |
428 | * just be a no-op for the particular interface. | |
429 | */ | |
430 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
431 | if (ieee80211_sdata_running(sdata)) | |
432 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); | |
433 | } | |
434 | ||
a2b70e83 EP |
435 | if (was_scanning) |
436 | ieee80211_start_next_roc(local); | |
0a51b27e | 437 | } |
8789d459 | 438 | |
7947d3e0 AS |
439 | void ieee80211_scan_completed(struct ieee80211_hw *hw, |
440 | struct cfg80211_scan_info *info) | |
8789d459 JB |
441 | { |
442 | struct ieee80211_local *local = hw_to_local(hw); | |
443 | ||
58bd7f11 | 444 | trace_api_scan_completed(local, info->aborted); |
8789d459 JB |
445 | |
446 | set_bit(SCAN_COMPLETED, &local->scanning); | |
7947d3e0 | 447 | if (info->aborted) |
8789d459 | 448 | set_bit(SCAN_ABORTED, &local->scanning); |
7947d3e0 AS |
449 | |
450 | memcpy(&local->scan_info, info, sizeof(*info)); | |
451 | ||
8789d459 JB |
452 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); |
453 | } | |
0a51b27e JB |
454 | EXPORT_SYMBOL(ieee80211_scan_completed); |
455 | ||
a344d677 JB |
456 | static int ieee80211_start_sw_scan(struct ieee80211_local *local, |
457 | struct ieee80211_sub_if_data *sdata) | |
f3b85252 | 458 | { |
fe57d9f5 JB |
459 | /* Software scan is not supported in multi-channel cases */ |
460 | if (local->use_chanctx) | |
461 | return -EOPNOTSUPP; | |
462 | ||
f3b85252 JB |
463 | /* |
464 | * Hardware/driver doesn't support hw_scan, so use software | |
465 | * scanning instead. First send a nullfunc frame with power save | |
466 | * bit on so that AP will buffer the frames for us while we are not | |
467 | * listening, then send probe requests to each channel and wait for | |
468 | * the responses. After all channels are scanned, tune back to the | |
469 | * original channel and send a nullfunc frame with power save bit | |
470 | * off to trigger the AP to send us all the buffered frames. | |
471 | * | |
472 | * Note that while local->sw_scanning is true everything else but | |
473 | * nullfunc frames and probe requests will be dropped in | |
474 | * ieee80211_tx_h_check_assoc(). | |
475 | */ | |
a344d677 | 476 | drv_sw_scan_start(local, sdata, local->scan_addr); |
f3b85252 | 477 | |
de312db3 | 478 | local->leave_oper_channel_time = jiffies; |
977923b0 | 479 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
480 | local->scan_channel_idx = 0; |
481 | ||
aacde9ee | 482 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 483 | |
9c35d7d2 | 484 | /* ensure nullfunc is transmitted before leaving operating channel */ |
3b24f4c6 | 485 | ieee80211_flush_queues(local, NULL, false); |
9c35d7d2 | 486 | |
3ac64bee | 487 | ieee80211_configure_filter(local); |
f3b85252 | 488 | |
59bdf3b0 BG |
489 | /* We need to set power level at maximum rate for scanning. */ |
490 | ieee80211_hw_config(local, 0); | |
491 | ||
42935eca | 492 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 493 | &local->scan_work, 0); |
f3b85252 JB |
494 | |
495 | return 0; | |
496 | } | |
497 | ||
133d40f9 SG |
498 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
499 | struct ieee80211_sub_if_data *sdata) | |
500 | { | |
5cbc95a7 | 501 | if (ieee80211_is_radar_required(local)) |
164eb02d SW |
502 | return false; |
503 | ||
2eb278e0 | 504 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
505 | return false; |
506 | ||
507 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
392b9ffb | 508 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
133d40f9 SG |
509 | return false; |
510 | ||
511 | return true; | |
512 | } | |
513 | ||
514 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
515 | { | |
516 | lockdep_assert_held(&local->mtx); | |
517 | ||
518 | if (!local->scan_req || local->scanning) | |
519 | return; | |
520 | ||
e2fd5dbc JB |
521 | if (!ieee80211_can_scan(local, |
522 | rcu_dereference_protected( | |
523 | local->scan_sdata, | |
524 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
525 | return; |
526 | ||
527 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
528 | round_jiffies_relative(0)); | |
529 | } | |
f3b85252 | 530 | |
8a690674 BG |
531 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
532 | unsigned long *next_delay) | |
533 | { | |
534 | int i; | |
e2fd5dbc | 535 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 536 | struct cfg80211_scan_request *scan_req; |
57fbcce3 | 537 | enum nl80211_band band = local->hw.conf.chandef.chan->band; |
6c17b77b SF |
538 | u32 tx_flags; |
539 | ||
6ea0a69c JB |
540 | scan_req = rcu_dereference_protected(local->scan_req, |
541 | lockdep_is_held(&local->mtx)); | |
542 | ||
6c17b77b | 543 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
6ea0a69c | 544 | if (scan_req->no_cck) |
6c17b77b | 545 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
8a690674 | 546 | |
e2fd5dbc | 547 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 548 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 549 | |
6ea0a69c | 550 | for (i = 0; i < scan_req->n_ssids; i++) |
8a690674 | 551 | ieee80211_send_probe_req( |
e345f44f | 552 | sdata, local->scan_addr, scan_req->bssid, |
6ea0a69c JB |
553 | scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, |
554 | scan_req->ie, scan_req->ie_len, | |
555 | scan_req->rates[band], false, | |
675a0b04 | 556 | tx_flags, local->hw.conf.chandef.chan, true); |
8a690674 BG |
557 | |
558 | /* | |
559 | * After sending probe requests, wait for probe responses | |
560 | * on the channel. | |
561 | */ | |
562 | *next_delay = IEEE80211_CHANNEL_TIME; | |
563 | local->next_scan_state = SCAN_DECISION; | |
564 | } | |
565 | ||
f3b85252 JB |
566 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
567 | struct cfg80211_scan_request *req) | |
568 | { | |
569 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
570 | int rc; |
571 | ||
e229f844 SG |
572 | lockdep_assert_held(&local->mtx); |
573 | ||
2726f23d | 574 | if (local->scan_req || ieee80211_is_radar_required(local)) |
f3b85252 JB |
575 | return -EBUSY; |
576 | ||
133d40f9 | 577 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 578 | /* wait for the work to finish/time out */ |
6ea0a69c | 579 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 580 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
581 | return 0; |
582 | } | |
583 | ||
f3b85252 JB |
584 | if (local->ops->hw_scan) { |
585 | u8 *ies; | |
f3b85252 | 586 | |
e4dcbb37 | 587 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
c56ef672 | 588 | |
30686bf7 | 589 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
c56ef672 DS |
590 | int i, n_bands = 0; |
591 | u8 bands_counted = 0; | |
592 | ||
593 | for (i = 0; i < req->n_channels; i++) { | |
594 | if (bands_counted & BIT(req->channels[i]->band)) | |
595 | continue; | |
596 | bands_counted |= BIT(req->channels[i]->band); | |
597 | n_bands++; | |
598 | } | |
599 | ||
600 | local->hw_scan_ies_bufsize *= n_bands; | |
601 | } | |
602 | ||
4d36ec58 JB |
603 | local->hw_scan_req = kmalloc( |
604 | sizeof(*local->hw_scan_req) + | |
605 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 606 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 607 | if (!local->hw_scan_req) |
f3b85252 JB |
608 | return -ENOMEM; |
609 | ||
c56ef672 DS |
610 | local->hw_scan_req->req.ssids = req->ssids; |
611 | local->hw_scan_req->req.n_ssids = req->n_ssids; | |
4d36ec58 JB |
612 | ies = (u8 *)local->hw_scan_req + |
613 | sizeof(*local->hw_scan_req) + | |
614 | req->n_channels * sizeof(req->channels[0]); | |
c56ef672 DS |
615 | local->hw_scan_req->req.ie = ies; |
616 | local->hw_scan_req->req.flags = req->flags; | |
e345f44f | 617 | eth_broadcast_addr(local->hw_scan_req->req.bssid); |
7947d3e0 AS |
618 | local->hw_scan_req->req.duration = req->duration; |
619 | local->hw_scan_req->req.duration_mandatory = | |
620 | req->duration_mandatory; | |
4d36ec58 JB |
621 | |
622 | local->hw_scan_band = 0; | |
6e7e6213 JL |
623 | |
624 | /* | |
625 | * After allocating local->hw_scan_req, we must | |
626 | * go through until ieee80211_prep_hw_scan(), so | |
627 | * anything that might be changed here and leave | |
628 | * this function early must not go after this | |
629 | * allocation. | |
630 | */ | |
f3b85252 JB |
631 | } |
632 | ||
6ea0a69c | 633 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 634 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 635 | |
a344d677 JB |
636 | if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
637 | get_random_mask_addr(local->scan_addr, | |
638 | req->mac_addr, | |
639 | req->mac_addr_mask); | |
640 | else | |
641 | memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); | |
642 | ||
8a690674 | 643 | if (local->ops->hw_scan) { |
fbe9c429 | 644 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 645 | } else if ((req->n_channels == 1) && |
675a0b04 | 646 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
647 | /* |
648 | * If we are scanning only on the operating channel | |
649 | * then we do not need to stop normal activities | |
8a690674 BG |
650 | */ |
651 | unsigned long next_delay; | |
652 | ||
653 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
654 | ||
655 | ieee80211_recalc_idle(local); | |
656 | ||
657 | /* Notify driver scan is starting, keep order of operations | |
658 | * same as normal software scan, in case that matters. */ | |
a344d677 | 659 | drv_sw_scan_start(local, sdata, local->scan_addr); |
8a690674 BG |
660 | |
661 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
662 | ||
663 | /* We need to ensure power level is at max for scanning. */ | |
664 | ieee80211_hw_config(local, 0); | |
665 | ||
4e39ccac AQ |
666 | if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | |
667 | IEEE80211_CHAN_RADAR)) || | |
6ea0a69c | 668 | !req->n_ssids) { |
8a690674 BG |
669 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
670 | } else { | |
671 | ieee80211_scan_state_send_probe(local, &next_delay); | |
672 | next_delay = IEEE80211_CHANNEL_TIME; | |
673 | } | |
674 | ||
675 | /* Now, just wait a bit and we are all done! */ | |
676 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
677 | next_delay); | |
678 | return 0; | |
679 | } else { | |
680 | /* Do normal software scan */ | |
fbe9c429 | 681 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 682 | } |
6e7e6213 | 683 | |
5cff20e6 | 684 | ieee80211_recalc_idle(local); |
f3b85252 | 685 | |
4d36ec58 JB |
686 | if (local->ops->hw_scan) { |
687 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 688 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
a344d677 JB |
689 | } else { |
690 | rc = ieee80211_start_sw_scan(local, sdata); | |
691 | } | |
f3b85252 | 692 | |
f3b85252 | 693 | if (rc) { |
4d36ec58 JB |
694 | kfree(local->hw_scan_req); |
695 | local->hw_scan_req = NULL; | |
fbe9c429 | 696 | local->scanning = 0; |
f3b85252 | 697 | |
5cff20e6 JB |
698 | ieee80211_recalc_idle(local); |
699 | ||
f3b85252 | 700 | local->scan_req = NULL; |
0c2bef46 | 701 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 JB |
702 | } |
703 | ||
704 | return rc; | |
705 | } | |
706 | ||
df13cce5 HS |
707 | static unsigned long |
708 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
709 | { | |
710 | /* | |
711 | * TODO: channel switching also consumes quite some time, | |
712 | * add that delay as well to get a better estimation | |
713 | */ | |
4e39ccac | 714 | if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) |
df13cce5 HS |
715 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
716 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
717 | } | |
718 | ||
e229f844 SG |
719 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
720 | unsigned long *next_delay) | |
7d3be3cc | 721 | { |
142b9f50 | 722 | bool associated = false; |
df13cce5 HS |
723 | bool tx_empty = true; |
724 | bool bad_latency; | |
142b9f50 | 725 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 726 | struct ieee80211_channel *next_chan; |
cd2bb512 | 727 | enum mac80211_scan_state next_scan_state; |
6ea0a69c | 728 | struct cfg80211_scan_request *scan_req; |
142b9f50 | 729 | |
df13cce5 HS |
730 | /* |
731 | * check if at least one STA interface is associated, | |
732 | * check if at least one STA interface has pending tx frames | |
733 | * and grab the lowest used beacon interval | |
734 | */ | |
142b9f50 HS |
735 | mutex_lock(&local->iflist_mtx); |
736 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 737 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
738 | continue; |
739 | ||
740 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
741 | if (sdata->u.mgd.associated) { | |
742 | associated = true; | |
df13cce5 | 743 | |
df13cce5 HS |
744 | if (!qdisc_all_tx_empty(sdata->dev)) { |
745 | tx_empty = false; | |
746 | break; | |
747 | } | |
142b9f50 HS |
748 | } |
749 | } | |
750 | } | |
751 | mutex_unlock(&local->iflist_mtx); | |
752 | ||
6ea0a69c JB |
753 | scan_req = rcu_dereference_protected(local->scan_req, |
754 | lockdep_is_held(&local->mtx)); | |
755 | ||
756 | next_chan = scan_req->channels[local->scan_channel_idx]; | |
b23b025f | 757 | |
a80f7c0b | 758 | /* |
07ef03ee JB |
759 | * we're currently scanning a different channel, let's |
760 | * see if we can scan another channel without interfering | |
761 | * with the current traffic situation. | |
762 | * | |
3f892b61 | 763 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 764 | */ |
a80f7c0b | 765 | |
07ef03ee | 766 | bad_latency = time_after(jiffies + |
3f892b61 SG |
767 | ieee80211_scan_get_channel_time(next_chan), |
768 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 769 | |
cd2bb512 | 770 | if (associated && !tx_empty) { |
6ea0a69c | 771 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
cd2bb512 SL |
772 | next_scan_state = SCAN_ABORT; |
773 | else | |
774 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 775 | } else if (associated && bad_latency) { |
cd2bb512 SL |
776 | next_scan_state = SCAN_SUSPEND; |
777 | } else { | |
778 | next_scan_state = SCAN_SET_CHANNEL; | |
779 | } | |
780 | ||
781 | local->next_scan_state = next_scan_state; | |
142b9f50 | 782 | |
07ef03ee | 783 | *next_delay = 0; |
142b9f50 HS |
784 | } |
785 | ||
2fb3f028 HS |
786 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
787 | unsigned long *next_delay) | |
788 | { | |
789 | int skip; | |
790 | struct ieee80211_channel *chan; | |
7ca15a0a | 791 | enum nl80211_bss_scan_width oper_scan_width; |
6ea0a69c JB |
792 | struct cfg80211_scan_request *scan_req; |
793 | ||
794 | scan_req = rcu_dereference_protected(local->scan_req, | |
795 | lockdep_is_held(&local->mtx)); | |
2fb3f028 | 796 | |
7d3be3cc | 797 | skip = 0; |
6ea0a69c | 798 | chan = scan_req->channels[local->scan_channel_idx]; |
7d3be3cc | 799 | |
7ca15a0a SW |
800 | local->scan_chandef.chan = chan; |
801 | local->scan_chandef.center_freq1 = chan->center_freq; | |
802 | local->scan_chandef.center_freq2 = 0; | |
6ea0a69c | 803 | switch (scan_req->scan_width) { |
7ca15a0a SW |
804 | case NL80211_BSS_CHAN_WIDTH_5: |
805 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; | |
806 | break; | |
807 | case NL80211_BSS_CHAN_WIDTH_10: | |
808 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; | |
809 | break; | |
810 | case NL80211_BSS_CHAN_WIDTH_20: | |
811 | /* If scanning on oper channel, use whatever channel-type | |
812 | * is currently in use. | |
813 | */ | |
814 | oper_scan_width = cfg80211_chandef_to_scan_width( | |
815 | &local->_oper_chandef); | |
816 | if (chan == local->_oper_chandef.chan && | |
6ea0a69c | 817 | oper_scan_width == scan_req->scan_width) |
7ca15a0a SW |
818 | local->scan_chandef = local->_oper_chandef; |
819 | else | |
820 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; | |
821 | break; | |
822 | } | |
b23b025f | 823 | |
07ef03ee JB |
824 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
825 | skip = 1; | |
7d3be3cc | 826 | |
7d3be3cc HS |
827 | /* advance state machine to next channel/band */ |
828 | local->scan_channel_idx++; | |
829 | ||
0ee9c13c HS |
830 | if (skip) { |
831 | /* if we skip this channel return to the decision state */ | |
832 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 833 | return; |
0ee9c13c | 834 | } |
7d3be3cc HS |
835 | |
836 | /* | |
837 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
838 | * (which unfortunately doesn't say _why_ step a) is done, | |
839 | * but it waits for the probe delay or until a frame is | |
840 | * received - and the received frame would update the NAV). | |
841 | * For now, we do not support waiting until a frame is | |
842 | * received. | |
843 | * | |
844 | * In any case, it is not necessary for a passive scan. | |
845 | */ | |
4e39ccac AQ |
846 | if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || |
847 | !scan_req->n_ssids) { | |
7d3be3cc | 848 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
977923b0 | 849 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 850 | return; |
7d3be3cc HS |
851 | } |
852 | ||
2fb3f028 | 853 | /* active scan, send probes */ |
7d3be3cc | 854 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 855 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
856 | } |
857 | ||
07ef03ee JB |
858 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
859 | unsigned long *next_delay) | |
860 | { | |
861 | /* switch back to the operating channel */ | |
7ca15a0a | 862 | local->scan_chandef.chan = NULL; |
07ef03ee JB |
863 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
864 | ||
aacde9ee SG |
865 | /* disable PS */ |
866 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
867 | |
868 | *next_delay = HZ / 5; | |
869 | /* afterwards, resume scan & go to next channel */ | |
870 | local->next_scan_state = SCAN_RESUME; | |
871 | } | |
872 | ||
873 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
874 | unsigned long *next_delay) | |
875 | { | |
aacde9ee | 876 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
877 | |
878 | if (local->ops->flush) { | |
3b24f4c6 | 879 | ieee80211_flush_queues(local, NULL, false); |
07ef03ee JB |
880 | *next_delay = 0; |
881 | } else | |
882 | *next_delay = HZ / 10; | |
883 | ||
884 | /* remember when we left the operating channel */ | |
885 | local->leave_oper_channel_time = jiffies; | |
886 | ||
887 | /* advance to the next channel to be scanned */ | |
de2ee84d | 888 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
889 | } |
890 | ||
c2b13452 | 891 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
892 | { |
893 | struct ieee80211_local *local = | |
894 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 895 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 896 | struct cfg80211_scan_request *scan_req; |
0a51b27e | 897 | unsigned long next_delay = 0; |
8bd2a248 | 898 | bool aborted; |
0a51b27e | 899 | |
259b62e3 | 900 | mutex_lock(&local->mtx); |
8789d459 | 901 | |
332ff7fe LC |
902 | if (!ieee80211_can_run_worker(local)) { |
903 | aborted = true; | |
904 | goto out_complete; | |
905 | } | |
906 | ||
e2fd5dbc JB |
907 | sdata = rcu_dereference_protected(local->scan_sdata, |
908 | lockdep_is_held(&local->mtx)); | |
6ea0a69c JB |
909 | scan_req = rcu_dereference_protected(local->scan_req, |
910 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 911 | |
8a690674 BG |
912 | /* When scanning on-channel, the first-callback means completed. */ |
913 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
914 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
915 | goto out_complete; | |
916 | } | |
917 | ||
259b62e3 | 918 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 919 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 920 | goto out_complete; |
8789d459 JB |
921 | } |
922 | ||
6ea0a69c | 923 | if (!sdata || !scan_req) |
259b62e3 | 924 | goto out; |
f3b85252 | 925 | |
ff5db439 | 926 | if (!local->scanning) { |
f3b85252 JB |
927 | int rc; |
928 | ||
6ea0a69c | 929 | RCU_INIT_POINTER(local->scan_req, NULL); |
0c2bef46 | 930 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 | 931 | |
6ea0a69c | 932 | rc = __ieee80211_start_scan(sdata, scan_req); |
259b62e3 | 933 | if (rc) { |
3aed49ef | 934 | /* need to complete scan in cfg80211 */ |
6ea0a69c | 935 | rcu_assign_pointer(local->scan_req, scan_req); |
259b62e3 SG |
936 | aborted = true; |
937 | goto out_complete; | |
938 | } else | |
939 | goto out; | |
f3b85252 JB |
940 | } |
941 | ||
f502d09b HS |
942 | /* |
943 | * as long as no delay is required advance immediately | |
944 | * without scheduling a new work | |
945 | */ | |
946 | do { | |
c29acf20 RM |
947 | if (!ieee80211_sdata_running(sdata)) { |
948 | aborted = true; | |
949 | goto out_complete; | |
950 | } | |
951 | ||
977923b0 | 952 | switch (local->next_scan_state) { |
2fb3f028 | 953 | case SCAN_DECISION: |
e229f844 | 954 | /* if no more bands/channels left, complete scan */ |
6ea0a69c | 955 | if (local->scan_channel_idx >= scan_req->n_channels) { |
e229f844 SG |
956 | aborted = false; |
957 | goto out_complete; | |
958 | } | |
959 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 960 | break; |
2fb3f028 HS |
961 | case SCAN_SET_CHANNEL: |
962 | ieee80211_scan_state_set_channel(local, &next_delay); | |
963 | break; | |
f502d09b HS |
964 | case SCAN_SEND_PROBE: |
965 | ieee80211_scan_state_send_probe(local, &next_delay); | |
966 | break; | |
07ef03ee JB |
967 | case SCAN_SUSPEND: |
968 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 969 | break; |
07ef03ee JB |
970 | case SCAN_RESUME: |
971 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 972 | break; |
cd2bb512 SL |
973 | case SCAN_ABORT: |
974 | aborted = true; | |
975 | goto out_complete; | |
f502d09b HS |
976 | } |
977 | } while (next_delay == 0); | |
0a51b27e | 978 | |
42935eca | 979 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 980 | goto out; |
259b62e3 SG |
981 | |
982 | out_complete: | |
8bd2a248 | 983 | __ieee80211_scan_completed(&local->hw, aborted); |
259b62e3 SG |
984 | out: |
985 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
986 | } |
987 | ||
f3b85252 JB |
988 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
989 | struct cfg80211_scan_request *req) | |
0a51b27e | 990 | { |
f3b85252 | 991 | int res; |
de95a54b | 992 | |
a1699b75 | 993 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 994 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 995 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 996 | |
f3b85252 | 997 | return res; |
0a51b27e JB |
998 | } |
999 | ||
34bcf715 SG |
1000 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
1001 | const u8 *ssid, u8 ssid_len, | |
76bed0f4 JD |
1002 | struct ieee80211_channel **channels, |
1003 | unsigned int n_channels, | |
7ca15a0a | 1004 | enum nl80211_bss_scan_width scan_width) |
0a51b27e | 1005 | { |
0a51b27e | 1006 | struct ieee80211_local *local = sdata->local; |
76bed0f4 | 1007 | int ret = -EBUSY, i, n_ch = 0; |
57fbcce3 | 1008 | enum nl80211_band band; |
2a519311 | 1009 | |
a1699b75 | 1010 | mutex_lock(&local->mtx); |
0a51b27e | 1011 | |
f3b85252 JB |
1012 | /* busy scanning */ |
1013 | if (local->scan_req) | |
1014 | goto unlock; | |
9116dd01 | 1015 | |
be4a4b6a | 1016 | /* fill internal scan request */ |
76bed0f4 JD |
1017 | if (!channels) { |
1018 | int max_n; | |
be4a4b6a | 1019 | |
57fbcce3 | 1020 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
be4a4b6a JB |
1021 | if (!local->hw.wiphy->bands[band]) |
1022 | continue; | |
34bcf715 SG |
1023 | |
1024 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
1025 | for (i = 0; i < max_n; i++) { | |
1026 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 1027 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 | 1028 | |
8fe02e16 | 1029 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
1030 | IEEE80211_CHAN_DISABLED)) |
1031 | continue; | |
1032 | ||
1033 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
1034 | n_ch++; | |
be4a4b6a JB |
1035 | } |
1036 | } | |
1037 | ||
34bcf715 SG |
1038 | if (WARN_ON_ONCE(n_ch == 0)) |
1039 | goto unlock; | |
1040 | ||
1041 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 1042 | } else { |
76bed0f4 JD |
1043 | for (i = 0; i < n_channels; i++) { |
1044 | if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | | |
1045 | IEEE80211_CHAN_DISABLED)) | |
1046 | continue; | |
1047 | ||
1048 | local->int_scan_req->channels[n_ch] = channels[i]; | |
1049 | n_ch++; | |
1050 | } | |
1051 | ||
1052 | if (WARN_ON_ONCE(n_ch == 0)) | |
34bcf715 SG |
1053 | goto unlock; |
1054 | ||
76bed0f4 | 1055 | local->int_scan_req->n_channels = n_ch; |
be4a4b6a JB |
1056 | } |
1057 | ||
1058 | local->int_scan_req->ssids = &local->scan_ssid; | |
1059 | local->int_scan_req->n_ssids = 1; | |
7ca15a0a | 1060 | local->int_scan_req->scan_width = scan_width; |
5ba63533 JB |
1061 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
1062 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 1063 | |
5ba63533 | 1064 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 1065 | unlock: |
a1699b75 | 1066 | mutex_unlock(&local->mtx); |
f3b85252 | 1067 | return ret; |
0a51b27e | 1068 | } |
5bb644a0 | 1069 | |
4136c422 SG |
1070 | /* |
1071 | * Only call this function when a scan can't be queued -- under RTNL. | |
1072 | */ | |
5bb644a0 JB |
1073 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
1074 | { | |
5bb644a0 | 1075 | /* |
b856439b | 1076 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
1077 | * yet really started (see __ieee80211_start_scan ). |
1078 | * | |
1079 | * Regarding hardware scan: | |
1080 | * - we can not call __ieee80211_scan_completed() as when | |
1081 | * SCAN_HW_SCANNING bit is set this function change | |
1082 | * local->hw_scan_req to operate on 5G band, what race with | |
1083 | * driver which can use local->hw_scan_req | |
1084 | * | |
1085 | * - we can not cancel scan_work since driver can schedule it | |
1086 | * by ieee80211_scan_completed(..., true) to finish scan | |
1087 | * | |
b856439b EP |
1088 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
1089 | * driver is still responsible for calling ieee80211_scan_completed() | |
1090 | * after the scan was completed/aborted. | |
5bb644a0 | 1091 | */ |
4136c422 | 1092 | |
a1699b75 | 1093 | mutex_lock(&local->mtx); |
b856439b EP |
1094 | if (!local->scan_req) |
1095 | goto out; | |
1096 | ||
a754055a EG |
1097 | /* |
1098 | * We have a scan running and the driver already reported completion, | |
1099 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
1100 | * cancelled. | |
1101 | */ | |
1102 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
1103 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
1104 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
1105 | goto out; | |
1106 | } | |
1107 | ||
b856439b | 1108 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
a754055a EG |
1109 | /* |
1110 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
1111 | * scan on another band. | |
1112 | */ | |
1113 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 1114 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
1115 | drv_cancel_hw_scan(local, |
1116 | rcu_dereference_protected(local->scan_sdata, | |
1117 | lockdep_is_held(&local->mtx))); | |
b856439b | 1118 | goto out; |
4136c422 | 1119 | } |
b856439b EP |
1120 | |
1121 | /* | |
1122 | * If the work is currently running, it must be blocked on | |
1123 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
1124 | * simply exit once it acquires the mutex. | |
1125 | */ | |
1126 | cancel_delayed_work(&local->scan_work); | |
1127 | /* and clean up */ | |
7947d3e0 | 1128 | memset(&local->scan_info, 0, sizeof(local->scan_info)); |
8bd2a248 | 1129 | __ieee80211_scan_completed(&local->hw, true); |
b856439b | 1130 | out: |
d07bfd8b | 1131 | mutex_unlock(&local->mtx); |
5bb644a0 | 1132 | } |
79f460ca | 1133 | |
d43c6b6e DS |
1134 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1135 | struct cfg80211_sched_scan_request *req) | |
79f460ca LC |
1136 | { |
1137 | struct ieee80211_local *local = sdata->local; | |
633e2713 | 1138 | struct ieee80211_scan_ies sched_scan_ies = {}; |
2103dec1 | 1139 | struct cfg80211_chan_def chandef; |
633e2713 | 1140 | int ret, i, iebufsz, num_bands = 0; |
57fbcce3 | 1141 | u32 rate_masks[NUM_NL80211_BANDS] = {}; |
633e2713 DS |
1142 | u8 bands_used = 0; |
1143 | u8 *ie; | |
c604b9f2 | 1144 | |
e4dcbb37 | 1145 | iebufsz = local->scan_ies_len + req->ie_len; |
79f460ca | 1146 | |
d43c6b6e | 1147 | lockdep_assert_held(&local->mtx); |
79f460ca | 1148 | |
d43c6b6e DS |
1149 | if (!local->ops->sched_scan_start) |
1150 | return -ENOTSUPP; | |
79f460ca | 1151 | |
57fbcce3 | 1152 | for (i = 0; i < NUM_NL80211_BANDS; i++) { |
633e2713 DS |
1153 | if (local->hw.wiphy->bands[i]) { |
1154 | bands_used |= BIT(i); | |
1155 | rate_masks[i] = (u32) -1; | |
1156 | num_bands++; | |
79f460ca | 1157 | } |
633e2713 | 1158 | } |
79f460ca | 1159 | |
6396bb22 | 1160 | ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); |
633e2713 DS |
1161 | if (!ie) { |
1162 | ret = -ENOMEM; | |
1163 | goto out; | |
79f460ca LC |
1164 | } |
1165 | ||
633e2713 DS |
1166 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
1167 | ||
cd5861bd KR |
1168 | ieee80211_build_preq_ies(local, ie, num_bands * iebufsz, |
1169 | &sched_scan_ies, req->ie, | |
1170 | req->ie_len, bands_used, rate_masks, &chandef); | |
633e2713 | 1171 | |
30dd3edf | 1172 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
d43c6b6e | 1173 | if (ret == 0) { |
5260a5b2 | 1174 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
6ea0a69c | 1175 | rcu_assign_pointer(local->sched_scan_req, req); |
d43c6b6e | 1176 | } |
79f460ca | 1177 | |
633e2713 | 1178 | kfree(ie); |
d43c6b6e | 1179 | |
633e2713 | 1180 | out: |
d43c6b6e DS |
1181 | if (ret) { |
1182 | /* Clean in case of failure after HW restart or upon resume. */ | |
0c2bef46 | 1183 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
6ea0a69c | 1184 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e DS |
1185 | } |
1186 | ||
1187 | return ret; | |
1188 | } | |
1189 | ||
1190 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
1191 | struct cfg80211_sched_scan_request *req) | |
1192 | { | |
1193 | struct ieee80211_local *local = sdata->local; | |
1194 | int ret; | |
1195 | ||
1196 | mutex_lock(&local->mtx); | |
1197 | ||
1198 | if (rcu_access_pointer(local->sched_scan_sdata)) { | |
1199 | mutex_unlock(&local->mtx); | |
1200 | return -EBUSY; | |
1201 | } | |
1202 | ||
1203 | ret = __ieee80211_request_sched_scan_start(sdata, req); | |
1204 | ||
5260a5b2 | 1205 | mutex_unlock(&local->mtx); |
79f460ca LC |
1206 | return ret; |
1207 | } | |
1208 | ||
0d440ea2 | 1209 | int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) |
79f460ca | 1210 | { |
0d440ea2 EP |
1211 | struct ieee80211_sub_if_data *sched_scan_sdata; |
1212 | int ret = -ENOENT; | |
79f460ca | 1213 | |
5260a5b2 | 1214 | mutex_lock(&local->mtx); |
79f460ca LC |
1215 | |
1216 | if (!local->ops->sched_scan_stop) { | |
1217 | ret = -ENOTSUPP; | |
1218 | goto out; | |
1219 | } | |
1220 | ||
d43c6b6e | 1221 | /* We don't want to restart sched scan anymore. */ |
6ea0a69c | 1222 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1223 | |
0d440ea2 EP |
1224 | sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, |
1225 | lockdep_is_held(&local->mtx)); | |
1226 | if (sched_scan_sdata) { | |
1227 | ret = drv_sched_scan_stop(local, sched_scan_sdata); | |
71228a1e | 1228 | if (!ret) |
ad053a96 | 1229 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
71228a1e | 1230 | } |
79f460ca | 1231 | out: |
5260a5b2 | 1232 | mutex_unlock(&local->mtx); |
79f460ca LC |
1233 | |
1234 | return ret; | |
1235 | } | |
1236 | ||
1237 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1238 | { | |
1239 | struct ieee80211_local *local = hw_to_local(hw); | |
1240 | ||
1241 | trace_api_sched_scan_results(local); | |
1242 | ||
b34939b9 | 1243 | cfg80211_sched_scan_results(hw->wiphy, 0); |
79f460ca LC |
1244 | } |
1245 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1246 | ||
f6837ba8 | 1247 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
85a9994a | 1248 | { |
85a9994a LC |
1249 | mutex_lock(&local->mtx); |
1250 | ||
5260a5b2 | 1251 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1252 | mutex_unlock(&local->mtx); |
1253 | return; | |
1254 | } | |
1255 | ||
0c2bef46 | 1256 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
85a9994a | 1257 | |
d43c6b6e | 1258 | /* If sched scan was aborted by the driver. */ |
6ea0a69c | 1259 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1260 | |
85a9994a LC |
1261 | mutex_unlock(&local->mtx); |
1262 | ||
b34939b9 | 1263 | cfg80211_sched_scan_stopped(local->hw.wiphy, 0); |
85a9994a LC |
1264 | } |
1265 | ||
f6837ba8 JB |
1266 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1267 | { | |
1268 | struct ieee80211_local *local = | |
1269 | container_of(work, struct ieee80211_local, | |
1270 | sched_scan_stopped_work); | |
1271 | ||
1272 | ieee80211_sched_scan_end(local); | |
1273 | } | |
1274 | ||
79f460ca LC |
1275 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1276 | { | |
1277 | struct ieee80211_local *local = hw_to_local(hw); | |
1278 | ||
1279 | trace_api_sched_scan_stopped(local); | |
1280 | ||
2bc533bd EP |
1281 | /* |
1282 | * this shouldn't really happen, so for simplicity | |
1283 | * simply ignore it, and let mac80211 reconfigure | |
1284 | * the sched scan later on. | |
1285 | */ | |
1286 | if (local->in_reconfig) | |
1287 | return; | |
1288 | ||
18db594a | 1289 | schedule_work(&local->sched_scan_stopped_work); |
79f460ca LC |
1290 | } |
1291 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |