Commit | Line | Data |
---|---|---|
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> | |
d98ad83e | 9 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
0a51b27e JB |
10 | * |
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 | ||
0a51b27e | 16 | #include <linux/if_arp.h> |
888d04df | 17 | #include <linux/etherdevice.h> |
078e1e60 | 18 | #include <linux/rtnetlink.h> |
e8db0be1 | 19 | #include <linux/pm_qos.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; |
7ca15a0a | 70 | enum nl80211_bss_scan_width scan_width; |
2a519311 JB |
71 | s32 signal = 0; |
72 | ||
77965c97 | 73 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 74 | signal = rx_status->signal * 100; |
77965c97 | 75 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 76 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 77 | |
7ca15a0a SW |
78 | scan_width = NL80211_BSS_CHAN_WIDTH_20; |
79 | if (rx_status->flag & RX_FLAG_5MHZ) | |
80 | scan_width = NL80211_BSS_CHAN_WIDTH_5; | |
81 | if (rx_status->flag & RX_FLAG_10MHZ) | |
82 | scan_width = NL80211_BSS_CHAN_WIDTH_10; | |
83 | ||
84 | cbss = cfg80211_inform_bss_width_frame(local->hw.wiphy, channel, | |
85 | scan_width, mgmt, len, signal, | |
86 | GFP_ATOMIC); | |
0c1ad2ca | 87 | if (!cbss) |
00d3f14c JB |
88 | return NULL; |
89 | ||
0c1ad2ca | 90 | bss = (void *)cbss->priv; |
5484e237 | 91 | |
ef429dad JB |
92 | if (beacon) |
93 | bss->device_ts_beacon = rx_status->device_timestamp; | |
94 | else | |
95 | bss->device_ts_presp = rx_status->device_timestamp; | |
8c358bcd | 96 | |
fcff4f10 PS |
97 | if (elems->parse_error) { |
98 | if (beacon) | |
99 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
100 | else | |
101 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
102 | } else { | |
103 | if (beacon) | |
104 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
105 | else | |
106 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
107 | } | |
108 | ||
5484e237 | 109 | /* save the ERP value so that it is available at association time */ |
1946bed9 JB |
110 | if (elems->erp_info && (!elems->parse_error || |
111 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 112 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 113 | bss->has_erp_value = true; |
fcff4f10 PS |
114 | if (!elems->parse_error) |
115 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
116 | } |
117 | ||
f0b058b6 | 118 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
119 | if (!elems->parse_error || |
120 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
121 | srlen = 0; | |
122 | if (elems->supp_rates) { | |
123 | clen = IEEE80211_MAX_SUPP_RATES; | |
124 | if (clen > elems->supp_rates_len) | |
125 | clen = elems->supp_rates_len; | |
126 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
127 | srlen += clen; | |
128 | } | |
129 | if (elems->ext_supp_rates) { | |
130 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
131 | if (clen > elems->ext_supp_rates_len) | |
132 | clen = elems->ext_supp_rates_len; | |
133 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
134 | clen); | |
135 | srlen += clen; | |
136 | } | |
137 | if (srlen) { | |
138 | bss->supp_rates_len = srlen; | |
139 | if (!elems->parse_error) | |
140 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
141 | } | |
5484e237 | 142 | } |
5484e237 | 143 | |
fcff4f10 PS |
144 | if (!elems->parse_error || |
145 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
146 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
147 | bss->uapsd_supported = is_uapsd_supported(elems); | |
148 | if (!elems->parse_error) | |
149 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
150 | } | |
5484e237 | 151 | |
817cee76 AB |
152 | if (beacon) { |
153 | struct ieee80211_supported_band *sband = | |
154 | local->hw.wiphy->bands[rx_status->band]; | |
155 | if (!(rx_status->flag & RX_FLAG_HT) && | |
156 | !(rx_status->flag & RX_FLAG_VHT)) | |
157 | bss->beacon_rate = | |
158 | &sband->bitrates[rx_status->rate_idx]; | |
159 | } | |
160 | ||
5484e237 JB |
161 | return bss; |
162 | } | |
0a51b27e | 163 | |
d48b2968 | 164 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 165 | { |
f1d58c25 | 166 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
167 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
168 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 169 | struct ieee80211_bss *bss; |
98c8fccf JB |
170 | u8 *elements; |
171 | struct ieee80211_channel *channel; | |
172 | size_t baselen; | |
98c8fccf JB |
173 | struct ieee802_11_elems elems; |
174 | ||
d48b2968 JB |
175 | if (skb->len < 24 || |
176 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
177 | !ieee80211_is_beacon(mgmt->frame_control))) | |
178 | return; | |
98c8fccf | 179 | |
d48b2968 JB |
180 | sdata1 = rcu_dereference(local->scan_sdata); |
181 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 182 | |
d48b2968 JB |
183 | if (likely(!sdata1 && !sdata2)) |
184 | return; | |
98c8fccf | 185 | |
d48b2968 | 186 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
98c8fccf | 187 | /* ignore ProbeResp to foreign address */ |
d48b2968 JB |
188 | if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && |
189 | (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) | |
190 | return; | |
98c8fccf | 191 | |
98c8fccf JB |
192 | elements = mgmt->u.probe_resp.variable; |
193 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
194 | } else { | |
98c8fccf JB |
195 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
196 | elements = mgmt->u.beacon.variable; | |
197 | } | |
198 | ||
98c8fccf | 199 | if (baselen > skb->len) |
d48b2968 | 200 | return; |
98c8fccf | 201 | |
b2e506bf | 202 | ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); |
98c8fccf | 203 | |
0172bb75 | 204 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
205 | |
206 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 207 | return; |
98c8fccf | 208 | |
d48b2968 | 209 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 210 | mgmt, skb->len, &elems, |
d45c4172 | 211 | channel); |
d048e503 | 212 | if (bss) |
d48b2968 | 213 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
214 | } |
215 | ||
2103dec1 SW |
216 | static void |
217 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, | |
218 | enum nl80211_bss_scan_width scan_width) | |
219 | { | |
220 | memset(chandef, 0, sizeof(*chandef)); | |
221 | switch (scan_width) { | |
222 | case NL80211_BSS_CHAN_WIDTH_5: | |
223 | chandef->width = NL80211_CHAN_WIDTH_5; | |
224 | break; | |
225 | case NL80211_BSS_CHAN_WIDTH_10: | |
226 | chandef->width = NL80211_CHAN_WIDTH_10; | |
227 | break; | |
228 | default: | |
229 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
230 | break; | |
231 | } | |
232 | } | |
233 | ||
4d36ec58 JB |
234 | /* return false if no more work */ |
235 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
236 | { | |
237 | struct cfg80211_scan_request *req = local->scan_req; | |
2103dec1 | 238 | struct cfg80211_chan_def chandef; |
c56ef672 | 239 | u8 bands_used = 0; |
4d36ec58 JB |
240 | int i, ielen, n_chans; |
241 | ||
a754055a EG |
242 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
243 | return false; | |
244 | ||
c56ef672 | 245 | if (local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) { |
4d36ec58 | 246 | for (i = 0; i < req->n_channels; i++) { |
c56ef672 DS |
247 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
248 | bands_used |= BIT(req->channels[i]->band); | |
249 | } | |
250 | ||
251 | n_chans = req->n_channels; | |
252 | } else { | |
253 | do { | |
254 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
255 | return false; | |
256 | ||
257 | n_chans = 0; | |
258 | ||
259 | for (i = 0; i < req->n_channels; i++) { | |
260 | if (req->channels[i]->band != | |
261 | local->hw_scan_band) | |
262 | continue; | |
263 | local->hw_scan_req->req.channels[n_chans] = | |
4d36ec58 JB |
264 | req->channels[i]; |
265 | n_chans++; | |
c56ef672 | 266 | bands_used |= BIT(req->channels[i]->band); |
4d36ec58 | 267 | } |
4d36ec58 | 268 | |
c56ef672 DS |
269 | local->hw_scan_band++; |
270 | } while (!n_chans); | |
271 | } | |
4d36ec58 | 272 | |
c56ef672 | 273 | local->hw_scan_req->req.n_channels = n_chans; |
2103dec1 | 274 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
4d36ec58 | 275 | |
c56ef672 DS |
276 | ielen = ieee80211_build_preq_ies(local, |
277 | (u8 *)local->hw_scan_req->req.ie, | |
c604b9f2 | 278 | local->hw_scan_ies_bufsize, |
c56ef672 DS |
279 | &local->hw_scan_req->ies, |
280 | req->ie, req->ie_len, | |
281 | bands_used, req->rates, &chandef); | |
282 | local->hw_scan_req->req.ie_len = ielen; | |
283 | local->hw_scan_req->req.no_cck = req->no_cck; | |
4d36ec58 JB |
284 | |
285 | return true; | |
286 | } | |
287 | ||
8bd2a248 | 288 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
289 | { |
290 | struct ieee80211_local *local = hw_to_local(hw); | |
8bd2a248 | 291 | bool hw_scan = local->ops->hw_scan; |
a2b70e83 | 292 | bool was_scanning = local->scanning; |
0a51b27e | 293 | |
e229f844 | 294 | lockdep_assert_held(&local->mtx); |
5bc75728 | 295 | |
6d3560d4 JB |
296 | /* |
297 | * It's ok to abort a not-yet-running scan (that | |
298 | * we have one at all will be verified by checking | |
299 | * local->scan_req next), but not to complete it | |
300 | * successfully. | |
301 | */ | |
302 | if (WARN_ON(!local->scanning && !aborted)) | |
303 | aborted = true; | |
5bc75728 | 304 | |
e229f844 | 305 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 306 | return; |
de95a54b | 307 | |
c56ef672 DS |
308 | if (hw_scan && !aborted && |
309 | !(local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) && | |
310 | ieee80211_prep_hw_scan(local)) { | |
e2fd5dbc JB |
311 | int rc; |
312 | ||
313 | rc = drv_hw_scan(local, | |
314 | rcu_dereference_protected(local->scan_sdata, | |
315 | lockdep_is_held(&local->mtx)), | |
316 | local->hw_scan_req); | |
317 | ||
6eb11a9a | 318 | if (rc == 0) |
d07bfd8b | 319 | return; |
4d36ec58 JB |
320 | } |
321 | ||
322 | kfree(local->hw_scan_req); | |
323 | local->hw_scan_req = NULL; | |
f3b85252 | 324 | |
5ba63533 | 325 | if (local->scan_req != local->int_scan_req) |
2a519311 JB |
326 | cfg80211_scan_done(local->scan_req, aborted); |
327 | local->scan_req = NULL; | |
0c2bef46 | 328 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
2a519311 | 329 | |
fbe9c429 | 330 | local->scanning = 0; |
7ca15a0a | 331 | local->scan_chandef.chan = NULL; |
f3b85252 | 332 | |
07ef03ee JB |
333 | /* Set power back to normal operating levels. */ |
334 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 335 | |
8bd2a248 | 336 | if (!hw_scan) { |
e229f844 SG |
337 | ieee80211_configure_filter(local); |
338 | drv_sw_scan_complete(local); | |
aacde9ee | 339 | ieee80211_offchannel_return(local); |
e229f844 | 340 | } |
0a51b27e | 341 | |
5cff20e6 | 342 | ieee80211_recalc_idle(local); |
e229f844 | 343 | |
0a51b27e | 344 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 345 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 346 | ieee80211_mesh_notify_scan_completed(local); |
a2b70e83 EP |
347 | if (was_scanning) |
348 | ieee80211_start_next_roc(local); | |
0a51b27e | 349 | } |
8789d459 JB |
350 | |
351 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
352 | { | |
353 | struct ieee80211_local *local = hw_to_local(hw); | |
354 | ||
355 | trace_api_scan_completed(local, aborted); | |
356 | ||
357 | set_bit(SCAN_COMPLETED, &local->scanning); | |
358 | if (aborted) | |
359 | set_bit(SCAN_ABORTED, &local->scanning); | |
360 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
361 | } | |
0a51b27e JB |
362 | EXPORT_SYMBOL(ieee80211_scan_completed); |
363 | ||
f3b85252 JB |
364 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
365 | { | |
fe57d9f5 JB |
366 | /* Software scan is not supported in multi-channel cases */ |
367 | if (local->use_chanctx) | |
368 | return -EOPNOTSUPP; | |
369 | ||
f3b85252 JB |
370 | /* |
371 | * Hardware/driver doesn't support hw_scan, so use software | |
372 | * scanning instead. First send a nullfunc frame with power save | |
373 | * bit on so that AP will buffer the frames for us while we are not | |
374 | * listening, then send probe requests to each channel and wait for | |
375 | * the responses. After all channels are scanned, tune back to the | |
376 | * original channel and send a nullfunc frame with power save bit | |
377 | * off to trigger the AP to send us all the buffered frames. | |
378 | * | |
379 | * Note that while local->sw_scanning is true everything else but | |
380 | * nullfunc frames and probe requests will be dropped in | |
381 | * ieee80211_tx_h_check_assoc(). | |
382 | */ | |
24487981 | 383 | drv_sw_scan_start(local); |
f3b85252 | 384 | |
de312db3 | 385 | local->leave_oper_channel_time = jiffies; |
977923b0 | 386 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
387 | local->scan_channel_idx = 0; |
388 | ||
aacde9ee | 389 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 390 | |
9c35d7d2 | 391 | /* ensure nullfunc is transmitted before leaving operating channel */ |
39ecc01d | 392 | ieee80211_flush_queues(local, NULL); |
9c35d7d2 | 393 | |
3ac64bee | 394 | ieee80211_configure_filter(local); |
f3b85252 | 395 | |
59bdf3b0 BG |
396 | /* We need to set power level at maximum rate for scanning. */ |
397 | ieee80211_hw_config(local, 0); | |
398 | ||
42935eca | 399 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 400 | &local->scan_work, 0); |
f3b85252 JB |
401 | |
402 | return 0; | |
403 | } | |
404 | ||
133d40f9 SG |
405 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
406 | struct ieee80211_sub_if_data *sdata) | |
407 | { | |
164eb02d SW |
408 | if (local->radar_detect_enabled) |
409 | return false; | |
410 | ||
2eb278e0 | 411 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
412 | return false; |
413 | ||
414 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
392b9ffb | 415 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
133d40f9 SG |
416 | return false; |
417 | ||
418 | return true; | |
419 | } | |
420 | ||
421 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
422 | { | |
423 | lockdep_assert_held(&local->mtx); | |
424 | ||
425 | if (!local->scan_req || local->scanning) | |
426 | return; | |
427 | ||
e2fd5dbc JB |
428 | if (!ieee80211_can_scan(local, |
429 | rcu_dereference_protected( | |
430 | local->scan_sdata, | |
431 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
432 | return; |
433 | ||
434 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
435 | round_jiffies_relative(0)); | |
436 | } | |
f3b85252 | 437 | |
8a690674 BG |
438 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
439 | unsigned long *next_delay) | |
440 | { | |
441 | int i; | |
e2fd5dbc | 442 | struct ieee80211_sub_if_data *sdata; |
675a0b04 | 443 | enum ieee80211_band band = local->hw.conf.chandef.chan->band; |
6c17b77b SF |
444 | u32 tx_flags; |
445 | ||
446 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; | |
447 | if (local->scan_req->no_cck) | |
448 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; | |
8a690674 | 449 | |
e2fd5dbc | 450 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 451 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 452 | |
8a690674 BG |
453 | for (i = 0; i < local->scan_req->n_ssids; i++) |
454 | ieee80211_send_probe_req( | |
455 | sdata, NULL, | |
456 | local->scan_req->ssids[i].ssid, | |
457 | local->scan_req->ssids[i].ssid_len, | |
458 | local->scan_req->ie, local->scan_req->ie_len, | |
459 | local->scan_req->rates[band], false, | |
675a0b04 | 460 | tx_flags, local->hw.conf.chandef.chan, true); |
8a690674 BG |
461 | |
462 | /* | |
463 | * After sending probe requests, wait for probe responses | |
464 | * on the channel. | |
465 | */ | |
466 | *next_delay = IEEE80211_CHANNEL_TIME; | |
467 | local->next_scan_state = SCAN_DECISION; | |
468 | } | |
469 | ||
f3b85252 JB |
470 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
471 | struct cfg80211_scan_request *req) | |
472 | { | |
473 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
474 | int rc; |
475 | ||
e229f844 SG |
476 | lockdep_assert_held(&local->mtx); |
477 | ||
f3b85252 JB |
478 | if (local->scan_req) |
479 | return -EBUSY; | |
480 | ||
133d40f9 | 481 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 482 | /* wait for the work to finish/time out */ |
c0ce77b8 | 483 | local->scan_req = req; |
e2fd5dbc | 484 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
485 | return 0; |
486 | } | |
487 | ||
f3b85252 JB |
488 | if (local->ops->hw_scan) { |
489 | u8 *ies; | |
f3b85252 | 490 | |
e4dcbb37 | 491 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
c56ef672 DS |
492 | |
493 | if (local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) { | |
494 | int i, n_bands = 0; | |
495 | u8 bands_counted = 0; | |
496 | ||
497 | for (i = 0; i < req->n_channels; i++) { | |
498 | if (bands_counted & BIT(req->channels[i]->band)) | |
499 | continue; | |
500 | bands_counted |= BIT(req->channels[i]->band); | |
501 | n_bands++; | |
502 | } | |
503 | ||
504 | local->hw_scan_ies_bufsize *= n_bands; | |
505 | } | |
506 | ||
4d36ec58 JB |
507 | local->hw_scan_req = kmalloc( |
508 | sizeof(*local->hw_scan_req) + | |
509 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 510 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 511 | if (!local->hw_scan_req) |
f3b85252 JB |
512 | return -ENOMEM; |
513 | ||
c56ef672 DS |
514 | local->hw_scan_req->req.ssids = req->ssids; |
515 | local->hw_scan_req->req.n_ssids = req->n_ssids; | |
4d36ec58 JB |
516 | ies = (u8 *)local->hw_scan_req + |
517 | sizeof(*local->hw_scan_req) + | |
518 | req->n_channels * sizeof(req->channels[0]); | |
c56ef672 DS |
519 | local->hw_scan_req->req.ie = ies; |
520 | local->hw_scan_req->req.flags = req->flags; | |
4d36ec58 JB |
521 | |
522 | local->hw_scan_band = 0; | |
6e7e6213 JL |
523 | |
524 | /* | |
525 | * After allocating local->hw_scan_req, we must | |
526 | * go through until ieee80211_prep_hw_scan(), so | |
527 | * anything that might be changed here and leave | |
528 | * this function early must not go after this | |
529 | * allocation. | |
530 | */ | |
f3b85252 JB |
531 | } |
532 | ||
533 | local->scan_req = req; | |
e2fd5dbc | 534 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 535 | |
8a690674 | 536 | if (local->ops->hw_scan) { |
fbe9c429 | 537 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 538 | } else if ((req->n_channels == 1) && |
675a0b04 | 539 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
540 | /* |
541 | * If we are scanning only on the operating channel | |
542 | * then we do not need to stop normal activities | |
8a690674 BG |
543 | */ |
544 | unsigned long next_delay; | |
545 | ||
546 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
547 | ||
548 | ieee80211_recalc_idle(local); | |
549 | ||
550 | /* Notify driver scan is starting, keep order of operations | |
551 | * same as normal software scan, in case that matters. */ | |
552 | drv_sw_scan_start(local); | |
553 | ||
554 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
555 | ||
556 | /* We need to ensure power level is at max for scanning. */ | |
557 | ieee80211_hw_config(local, 0); | |
558 | ||
559 | if ((req->channels[0]->flags & | |
8fe02e16 | 560 | IEEE80211_CHAN_NO_IR) || |
8a690674 BG |
561 | !local->scan_req->n_ssids) { |
562 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
563 | } else { | |
564 | ieee80211_scan_state_send_probe(local, &next_delay); | |
565 | next_delay = IEEE80211_CHANNEL_TIME; | |
566 | } | |
567 | ||
568 | /* Now, just wait a bit and we are all done! */ | |
569 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
570 | next_delay); | |
571 | return 0; | |
572 | } else { | |
573 | /* Do normal software scan */ | |
fbe9c429 | 574 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 575 | } |
6e7e6213 | 576 | |
5cff20e6 | 577 | ieee80211_recalc_idle(local); |
f3b85252 | 578 | |
4d36ec58 JB |
579 | if (local->ops->hw_scan) { |
580 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 581 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
4d36ec58 | 582 | } else |
f3b85252 JB |
583 | rc = ieee80211_start_sw_scan(local); |
584 | ||
f3b85252 | 585 | if (rc) { |
4d36ec58 JB |
586 | kfree(local->hw_scan_req); |
587 | local->hw_scan_req = NULL; | |
fbe9c429 | 588 | local->scanning = 0; |
f3b85252 | 589 | |
5cff20e6 JB |
590 | ieee80211_recalc_idle(local); |
591 | ||
f3b85252 | 592 | local->scan_req = NULL; |
0c2bef46 | 593 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 JB |
594 | } |
595 | ||
596 | return rc; | |
597 | } | |
598 | ||
df13cce5 HS |
599 | static unsigned long |
600 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
601 | { | |
602 | /* | |
603 | * TODO: channel switching also consumes quite some time, | |
604 | * add that delay as well to get a better estimation | |
605 | */ | |
8fe02e16 | 606 | if (chan->flags & IEEE80211_CHAN_NO_IR) |
df13cce5 HS |
607 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
608 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
609 | } | |
610 | ||
e229f844 SG |
611 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
612 | unsigned long *next_delay) | |
7d3be3cc | 613 | { |
142b9f50 | 614 | bool associated = false; |
df13cce5 HS |
615 | bool tx_empty = true; |
616 | bool bad_latency; | |
142b9f50 | 617 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 618 | struct ieee80211_channel *next_chan; |
cd2bb512 | 619 | enum mac80211_scan_state next_scan_state; |
142b9f50 | 620 | |
df13cce5 HS |
621 | /* |
622 | * check if at least one STA interface is associated, | |
623 | * check if at least one STA interface has pending tx frames | |
624 | * and grab the lowest used beacon interval | |
625 | */ | |
142b9f50 HS |
626 | mutex_lock(&local->iflist_mtx); |
627 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 628 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
629 | continue; |
630 | ||
631 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
632 | if (sdata->u.mgd.associated) { | |
633 | associated = true; | |
df13cce5 | 634 | |
df13cce5 HS |
635 | if (!qdisc_all_tx_empty(sdata->dev)) { |
636 | tx_empty = false; | |
637 | break; | |
638 | } | |
142b9f50 HS |
639 | } |
640 | } | |
641 | } | |
642 | mutex_unlock(&local->iflist_mtx); | |
643 | ||
b23b025f BG |
644 | next_chan = local->scan_req->channels[local->scan_channel_idx]; |
645 | ||
a80f7c0b | 646 | /* |
07ef03ee JB |
647 | * we're currently scanning a different channel, let's |
648 | * see if we can scan another channel without interfering | |
649 | * with the current traffic situation. | |
650 | * | |
3f892b61 | 651 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 652 | */ |
a80f7c0b | 653 | |
07ef03ee | 654 | bad_latency = time_after(jiffies + |
3f892b61 SG |
655 | ieee80211_scan_get_channel_time(next_chan), |
656 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 657 | |
cd2bb512 SL |
658 | if (associated && !tx_empty) { |
659 | if (local->scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) | |
660 | next_scan_state = SCAN_ABORT; | |
661 | else | |
662 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 663 | } else if (associated && bad_latency) { |
cd2bb512 SL |
664 | next_scan_state = SCAN_SUSPEND; |
665 | } else { | |
666 | next_scan_state = SCAN_SET_CHANNEL; | |
667 | } | |
668 | ||
669 | local->next_scan_state = next_scan_state; | |
142b9f50 | 670 | |
07ef03ee | 671 | *next_delay = 0; |
142b9f50 HS |
672 | } |
673 | ||
2fb3f028 HS |
674 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
675 | unsigned long *next_delay) | |
676 | { | |
677 | int skip; | |
678 | struct ieee80211_channel *chan; | |
7ca15a0a | 679 | enum nl80211_bss_scan_width oper_scan_width; |
2fb3f028 | 680 | |
7d3be3cc HS |
681 | skip = 0; |
682 | chan = local->scan_req->channels[local->scan_channel_idx]; | |
683 | ||
7ca15a0a SW |
684 | local->scan_chandef.chan = chan; |
685 | local->scan_chandef.center_freq1 = chan->center_freq; | |
686 | local->scan_chandef.center_freq2 = 0; | |
687 | switch (local->scan_req->scan_width) { | |
688 | case NL80211_BSS_CHAN_WIDTH_5: | |
689 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; | |
690 | break; | |
691 | case NL80211_BSS_CHAN_WIDTH_10: | |
692 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; | |
693 | break; | |
694 | case NL80211_BSS_CHAN_WIDTH_20: | |
695 | /* If scanning on oper channel, use whatever channel-type | |
696 | * is currently in use. | |
697 | */ | |
698 | oper_scan_width = cfg80211_chandef_to_scan_width( | |
699 | &local->_oper_chandef); | |
700 | if (chan == local->_oper_chandef.chan && | |
701 | oper_scan_width == local->scan_req->scan_width) | |
702 | local->scan_chandef = local->_oper_chandef; | |
703 | else | |
704 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; | |
705 | break; | |
706 | } | |
b23b025f | 707 | |
07ef03ee JB |
708 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
709 | skip = 1; | |
7d3be3cc | 710 | |
7d3be3cc HS |
711 | /* advance state machine to next channel/band */ |
712 | local->scan_channel_idx++; | |
713 | ||
0ee9c13c HS |
714 | if (skip) { |
715 | /* if we skip this channel return to the decision state */ | |
716 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 717 | return; |
0ee9c13c | 718 | } |
7d3be3cc HS |
719 | |
720 | /* | |
721 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
722 | * (which unfortunately doesn't say _why_ step a) is done, | |
723 | * but it waits for the probe delay or until a frame is | |
724 | * received - and the received frame would update the NAV). | |
725 | * For now, we do not support waiting until a frame is | |
726 | * received. | |
727 | * | |
728 | * In any case, it is not necessary for a passive scan. | |
729 | */ | |
8fe02e16 | 730 | if (chan->flags & IEEE80211_CHAN_NO_IR || |
7d3be3cc HS |
731 | !local->scan_req->n_ssids) { |
732 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
977923b0 | 733 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 734 | return; |
7d3be3cc HS |
735 | } |
736 | ||
2fb3f028 | 737 | /* active scan, send probes */ |
7d3be3cc | 738 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 739 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
740 | } |
741 | ||
07ef03ee JB |
742 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
743 | unsigned long *next_delay) | |
744 | { | |
745 | /* switch back to the operating channel */ | |
7ca15a0a | 746 | local->scan_chandef.chan = NULL; |
07ef03ee JB |
747 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
748 | ||
aacde9ee SG |
749 | /* disable PS */ |
750 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
751 | |
752 | *next_delay = HZ / 5; | |
753 | /* afterwards, resume scan & go to next channel */ | |
754 | local->next_scan_state = SCAN_RESUME; | |
755 | } | |
756 | ||
757 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
758 | unsigned long *next_delay) | |
759 | { | |
aacde9ee | 760 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
761 | |
762 | if (local->ops->flush) { | |
39ecc01d | 763 | ieee80211_flush_queues(local, NULL); |
07ef03ee JB |
764 | *next_delay = 0; |
765 | } else | |
766 | *next_delay = HZ / 10; | |
767 | ||
768 | /* remember when we left the operating channel */ | |
769 | local->leave_oper_channel_time = jiffies; | |
770 | ||
771 | /* advance to the next channel to be scanned */ | |
de2ee84d | 772 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
773 | } |
774 | ||
c2b13452 | 775 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
776 | { |
777 | struct ieee80211_local *local = | |
778 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 779 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 780 | unsigned long next_delay = 0; |
8bd2a248 | 781 | bool aborted; |
0a51b27e | 782 | |
259b62e3 | 783 | mutex_lock(&local->mtx); |
8789d459 | 784 | |
e2fd5dbc JB |
785 | sdata = rcu_dereference_protected(local->scan_sdata, |
786 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 787 | |
8a690674 BG |
788 | /* When scanning on-channel, the first-callback means completed. */ |
789 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
790 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
791 | goto out_complete; | |
792 | } | |
793 | ||
259b62e3 | 794 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 795 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 796 | goto out_complete; |
8789d459 JB |
797 | } |
798 | ||
259b62e3 SG |
799 | if (!sdata || !local->scan_req) |
800 | goto out; | |
f3b85252 | 801 | |
fbe9c429 | 802 | if (local->scan_req && !local->scanning) { |
f3b85252 JB |
803 | struct cfg80211_scan_request *req = local->scan_req; |
804 | int rc; | |
805 | ||
806 | local->scan_req = NULL; | |
0c2bef46 | 807 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 JB |
808 | |
809 | rc = __ieee80211_start_scan(sdata, req); | |
259b62e3 | 810 | if (rc) { |
3aed49ef SG |
811 | /* need to complete scan in cfg80211 */ |
812 | local->scan_req = req; | |
259b62e3 SG |
813 | aborted = true; |
814 | goto out_complete; | |
815 | } else | |
816 | goto out; | |
f3b85252 JB |
817 | } |
818 | ||
f502d09b HS |
819 | /* |
820 | * as long as no delay is required advance immediately | |
821 | * without scheduling a new work | |
822 | */ | |
823 | do { | |
c29acf20 RM |
824 | if (!ieee80211_sdata_running(sdata)) { |
825 | aborted = true; | |
826 | goto out_complete; | |
827 | } | |
828 | ||
977923b0 | 829 | switch (local->next_scan_state) { |
2fb3f028 | 830 | case SCAN_DECISION: |
e229f844 SG |
831 | /* if no more bands/channels left, complete scan */ |
832 | if (local->scan_channel_idx >= local->scan_req->n_channels) { | |
833 | aborted = false; | |
834 | goto out_complete; | |
835 | } | |
836 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 837 | break; |
2fb3f028 HS |
838 | case SCAN_SET_CHANNEL: |
839 | ieee80211_scan_state_set_channel(local, &next_delay); | |
840 | break; | |
f502d09b HS |
841 | case SCAN_SEND_PROBE: |
842 | ieee80211_scan_state_send_probe(local, &next_delay); | |
843 | break; | |
07ef03ee JB |
844 | case SCAN_SUSPEND: |
845 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 846 | break; |
07ef03ee JB |
847 | case SCAN_RESUME: |
848 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 849 | break; |
cd2bb512 SL |
850 | case SCAN_ABORT: |
851 | aborted = true; | |
852 | goto out_complete; | |
f502d09b HS |
853 | } |
854 | } while (next_delay == 0); | |
0a51b27e | 855 | |
42935eca | 856 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 857 | goto out; |
259b62e3 SG |
858 | |
859 | out_complete: | |
8bd2a248 | 860 | __ieee80211_scan_completed(&local->hw, aborted); |
259b62e3 SG |
861 | out: |
862 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
863 | } |
864 | ||
f3b85252 JB |
865 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
866 | struct cfg80211_scan_request *req) | |
0a51b27e | 867 | { |
f3b85252 | 868 | int res; |
de95a54b | 869 | |
a1699b75 | 870 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 871 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 872 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 873 | |
f3b85252 | 874 | return res; |
0a51b27e JB |
875 | } |
876 | ||
34bcf715 SG |
877 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
878 | const u8 *ssid, u8 ssid_len, | |
7ca15a0a SW |
879 | struct ieee80211_channel *chan, |
880 | enum nl80211_bss_scan_width scan_width) | |
0a51b27e | 881 | { |
0a51b27e | 882 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 883 | int ret = -EBUSY; |
fb63bc41 | 884 | enum ieee80211_band band; |
2a519311 | 885 | |
a1699b75 | 886 | mutex_lock(&local->mtx); |
0a51b27e | 887 | |
f3b85252 JB |
888 | /* busy scanning */ |
889 | if (local->scan_req) | |
890 | goto unlock; | |
9116dd01 | 891 | |
be4a4b6a JB |
892 | /* fill internal scan request */ |
893 | if (!chan) { | |
34bcf715 SG |
894 | int i, max_n; |
895 | int n_ch = 0; | |
be4a4b6a JB |
896 | |
897 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
898 | if (!local->hw.wiphy->bands[band]) | |
899 | continue; | |
34bcf715 SG |
900 | |
901 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
902 | for (i = 0; i < max_n; i++) { | |
903 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 904 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 | 905 | |
8fe02e16 | 906 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
907 | IEEE80211_CHAN_DISABLED)) |
908 | continue; | |
909 | ||
910 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
911 | n_ch++; | |
be4a4b6a JB |
912 | } |
913 | } | |
914 | ||
34bcf715 SG |
915 | if (WARN_ON_ONCE(n_ch == 0)) |
916 | goto unlock; | |
917 | ||
918 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 919 | } else { |
8fe02e16 | 920 | if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
921 | IEEE80211_CHAN_DISABLED))) |
922 | goto unlock; | |
923 | ||
be4a4b6a JB |
924 | local->int_scan_req->channels[0] = chan; |
925 | local->int_scan_req->n_channels = 1; | |
926 | } | |
927 | ||
928 | local->int_scan_req->ssids = &local->scan_ssid; | |
929 | local->int_scan_req->n_ssids = 1; | |
7ca15a0a | 930 | local->int_scan_req->scan_width = scan_width; |
5ba63533 JB |
931 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
932 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 933 | |
5ba63533 | 934 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 935 | unlock: |
a1699b75 | 936 | mutex_unlock(&local->mtx); |
f3b85252 | 937 | return ret; |
0a51b27e | 938 | } |
5bb644a0 | 939 | |
4136c422 SG |
940 | /* |
941 | * Only call this function when a scan can't be queued -- under RTNL. | |
942 | */ | |
5bb644a0 JB |
943 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
944 | { | |
5bb644a0 | 945 | /* |
b856439b | 946 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
947 | * yet really started (see __ieee80211_start_scan ). |
948 | * | |
949 | * Regarding hardware scan: | |
950 | * - we can not call __ieee80211_scan_completed() as when | |
951 | * SCAN_HW_SCANNING bit is set this function change | |
952 | * local->hw_scan_req to operate on 5G band, what race with | |
953 | * driver which can use local->hw_scan_req | |
954 | * | |
955 | * - we can not cancel scan_work since driver can schedule it | |
956 | * by ieee80211_scan_completed(..., true) to finish scan | |
957 | * | |
b856439b EP |
958 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
959 | * driver is still responsible for calling ieee80211_scan_completed() | |
960 | * after the scan was completed/aborted. | |
5bb644a0 | 961 | */ |
4136c422 | 962 | |
a1699b75 | 963 | mutex_lock(&local->mtx); |
b856439b EP |
964 | if (!local->scan_req) |
965 | goto out; | |
966 | ||
a754055a EG |
967 | /* |
968 | * We have a scan running and the driver already reported completion, | |
969 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
970 | * cancelled. | |
971 | */ | |
972 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
973 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
974 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
975 | goto out; | |
976 | } | |
977 | ||
b856439b | 978 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
a754055a EG |
979 | /* |
980 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
981 | * scan on another band. | |
982 | */ | |
983 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 984 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
985 | drv_cancel_hw_scan(local, |
986 | rcu_dereference_protected(local->scan_sdata, | |
987 | lockdep_is_held(&local->mtx))); | |
b856439b | 988 | goto out; |
4136c422 | 989 | } |
b856439b EP |
990 | |
991 | /* | |
992 | * If the work is currently running, it must be blocked on | |
993 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
994 | * simply exit once it acquires the mutex. | |
995 | */ | |
996 | cancel_delayed_work(&local->scan_work); | |
997 | /* and clean up */ | |
8bd2a248 | 998 | __ieee80211_scan_completed(&local->hw, true); |
b856439b | 999 | out: |
d07bfd8b | 1000 | mutex_unlock(&local->mtx); |
5bb644a0 | 1001 | } |
79f460ca | 1002 | |
d43c6b6e DS |
1003 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1004 | struct cfg80211_sched_scan_request *req) | |
79f460ca LC |
1005 | { |
1006 | struct ieee80211_local *local = sdata->local; | |
633e2713 | 1007 | struct ieee80211_scan_ies sched_scan_ies = {}; |
2103dec1 | 1008 | struct cfg80211_chan_def chandef; |
633e2713 DS |
1009 | int ret, i, iebufsz, num_bands = 0; |
1010 | u32 rate_masks[IEEE80211_NUM_BANDS] = {}; | |
1011 | u8 bands_used = 0; | |
1012 | u8 *ie; | |
1013 | size_t len; | |
c604b9f2 | 1014 | |
e4dcbb37 | 1015 | iebufsz = local->scan_ies_len + req->ie_len; |
79f460ca | 1016 | |
d43c6b6e | 1017 | lockdep_assert_held(&local->mtx); |
79f460ca | 1018 | |
d43c6b6e DS |
1019 | if (!local->ops->sched_scan_start) |
1020 | return -ENOTSUPP; | |
79f460ca LC |
1021 | |
1022 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
633e2713 DS |
1023 | if (local->hw.wiphy->bands[i]) { |
1024 | bands_used |= BIT(i); | |
1025 | rate_masks[i] = (u32) -1; | |
1026 | num_bands++; | |
79f460ca | 1027 | } |
633e2713 | 1028 | } |
79f460ca | 1029 | |
633e2713 DS |
1030 | ie = kzalloc(num_bands * iebufsz, GFP_KERNEL); |
1031 | if (!ie) { | |
1032 | ret = -ENOMEM; | |
1033 | goto out; | |
79f460ca LC |
1034 | } |
1035 | ||
633e2713 DS |
1036 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
1037 | ||
1038 | len = ieee80211_build_preq_ies(local, ie, num_bands * iebufsz, | |
1039 | &sched_scan_ies, req->ie, | |
1040 | req->ie_len, bands_used, | |
1041 | rate_masks, &chandef); | |
1042 | ||
30dd3edf | 1043 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
d43c6b6e | 1044 | if (ret == 0) { |
5260a5b2 | 1045 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
d43c6b6e DS |
1046 | local->sched_scan_req = req; |
1047 | } | |
79f460ca | 1048 | |
633e2713 | 1049 | kfree(ie); |
d43c6b6e | 1050 | |
633e2713 | 1051 | out: |
d43c6b6e DS |
1052 | if (ret) { |
1053 | /* Clean in case of failure after HW restart or upon resume. */ | |
0c2bef46 | 1054 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
d43c6b6e DS |
1055 | local->sched_scan_req = NULL; |
1056 | } | |
1057 | ||
1058 | return ret; | |
1059 | } | |
1060 | ||
1061 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
1062 | struct cfg80211_sched_scan_request *req) | |
1063 | { | |
1064 | struct ieee80211_local *local = sdata->local; | |
1065 | int ret; | |
1066 | ||
1067 | mutex_lock(&local->mtx); | |
1068 | ||
1069 | if (rcu_access_pointer(local->sched_scan_sdata)) { | |
1070 | mutex_unlock(&local->mtx); | |
1071 | return -EBUSY; | |
1072 | } | |
1073 | ||
1074 | ret = __ieee80211_request_sched_scan_start(sdata, req); | |
1075 | ||
5260a5b2 | 1076 | mutex_unlock(&local->mtx); |
79f460ca LC |
1077 | return ret; |
1078 | } | |
1079 | ||
85a9994a | 1080 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) |
79f460ca LC |
1081 | { |
1082 | struct ieee80211_local *local = sdata->local; | |
30dd3edf | 1083 | int ret = 0; |
79f460ca | 1084 | |
5260a5b2 | 1085 | mutex_lock(&local->mtx); |
79f460ca LC |
1086 | |
1087 | if (!local->ops->sched_scan_stop) { | |
1088 | ret = -ENOTSUPP; | |
1089 | goto out; | |
1090 | } | |
1091 | ||
d43c6b6e DS |
1092 | /* We don't want to restart sched scan anymore. */ |
1093 | local->sched_scan_req = NULL; | |
1094 | ||
71228a1e | 1095 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
37e3308c | 1096 | ret = drv_sched_scan_stop(local, sdata); |
71228a1e | 1097 | if (!ret) |
ad053a96 | 1098 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
71228a1e | 1099 | } |
79f460ca | 1100 | out: |
5260a5b2 | 1101 | mutex_unlock(&local->mtx); |
79f460ca LC |
1102 | |
1103 | return ret; | |
1104 | } | |
1105 | ||
1106 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1107 | { | |
1108 | struct ieee80211_local *local = hw_to_local(hw); | |
1109 | ||
1110 | trace_api_sched_scan_results(local); | |
1111 | ||
1112 | cfg80211_sched_scan_results(hw->wiphy); | |
1113 | } | |
1114 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1115 | ||
f6837ba8 | 1116 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
85a9994a | 1117 | { |
85a9994a LC |
1118 | mutex_lock(&local->mtx); |
1119 | ||
5260a5b2 | 1120 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1121 | mutex_unlock(&local->mtx); |
1122 | return; | |
1123 | } | |
1124 | ||
0c2bef46 | 1125 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
85a9994a | 1126 | |
d43c6b6e DS |
1127 | /* If sched scan was aborted by the driver. */ |
1128 | local->sched_scan_req = NULL; | |
1129 | ||
85a9994a LC |
1130 | mutex_unlock(&local->mtx); |
1131 | ||
1132 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
1133 | } | |
1134 | ||
f6837ba8 JB |
1135 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1136 | { | |
1137 | struct ieee80211_local *local = | |
1138 | container_of(work, struct ieee80211_local, | |
1139 | sched_scan_stopped_work); | |
1140 | ||
1141 | ieee80211_sched_scan_end(local); | |
1142 | } | |
1143 | ||
79f460ca LC |
1144 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1145 | { | |
1146 | struct ieee80211_local *local = hw_to_local(hw); | |
1147 | ||
1148 | trace_api_sched_scan_stopped(local); | |
1149 | ||
18db594a | 1150 | schedule_work(&local->sched_scan_stopped_work); |
79f460ca LC |
1151 | } |
1152 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |