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)) { |
a344d677 JB |
187 | struct cfg80211_scan_request *scan_req; |
188 | struct cfg80211_sched_scan_request *sched_scan_req; | |
189 | ||
190 | scan_req = rcu_dereference(local->scan_req); | |
191 | sched_scan_req = rcu_dereference(local->sched_scan_req); | |
192 | ||
193 | /* ignore ProbeResp to foreign address unless scanning | |
194 | * with randomised address | |
195 | */ | |
196 | if (!(sdata1 && | |
197 | (ether_addr_equal(mgmt->da, sdata1->vif.addr) || | |
198 | scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)) && | |
199 | !(sdata2 && | |
200 | (ether_addr_equal(mgmt->da, sdata2->vif.addr) || | |
201 | sched_scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR))) | |
d48b2968 | 202 | return; |
98c8fccf | 203 | |
98c8fccf JB |
204 | elements = mgmt->u.probe_resp.variable; |
205 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
206 | } else { | |
98c8fccf JB |
207 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
208 | elements = mgmt->u.beacon.variable; | |
209 | } | |
210 | ||
98c8fccf | 211 | if (baselen > skb->len) |
d48b2968 | 212 | return; |
98c8fccf | 213 | |
b2e506bf | 214 | ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); |
98c8fccf | 215 | |
0172bb75 | 216 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
217 | |
218 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 219 | return; |
98c8fccf | 220 | |
d48b2968 | 221 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 222 | mgmt, skb->len, &elems, |
d45c4172 | 223 | channel); |
d048e503 | 224 | if (bss) |
d48b2968 | 225 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
226 | } |
227 | ||
2103dec1 SW |
228 | static void |
229 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, | |
230 | enum nl80211_bss_scan_width scan_width) | |
231 | { | |
232 | memset(chandef, 0, sizeof(*chandef)); | |
233 | switch (scan_width) { | |
234 | case NL80211_BSS_CHAN_WIDTH_5: | |
235 | chandef->width = NL80211_CHAN_WIDTH_5; | |
236 | break; | |
237 | case NL80211_BSS_CHAN_WIDTH_10: | |
238 | chandef->width = NL80211_CHAN_WIDTH_10; | |
239 | break; | |
240 | default: | |
241 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
242 | break; | |
243 | } | |
244 | } | |
245 | ||
4d36ec58 JB |
246 | /* return false if no more work */ |
247 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
248 | { | |
6ea0a69c | 249 | struct cfg80211_scan_request *req; |
2103dec1 | 250 | struct cfg80211_chan_def chandef; |
c56ef672 | 251 | u8 bands_used = 0; |
4d36ec58 JB |
252 | int i, ielen, n_chans; |
253 | ||
6ea0a69c JB |
254 | req = rcu_dereference_protected(local->scan_req, |
255 | lockdep_is_held(&local->mtx)); | |
256 | ||
a754055a EG |
257 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
258 | return false; | |
259 | ||
c56ef672 | 260 | if (local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) { |
4d36ec58 | 261 | for (i = 0; i < req->n_channels; i++) { |
c56ef672 DS |
262 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
263 | bands_used |= BIT(req->channels[i]->band); | |
264 | } | |
265 | ||
266 | n_chans = req->n_channels; | |
267 | } else { | |
268 | do { | |
269 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
270 | return false; | |
271 | ||
272 | n_chans = 0; | |
273 | ||
274 | for (i = 0; i < req->n_channels; i++) { | |
275 | if (req->channels[i]->band != | |
276 | local->hw_scan_band) | |
277 | continue; | |
278 | local->hw_scan_req->req.channels[n_chans] = | |
4d36ec58 JB |
279 | req->channels[i]; |
280 | n_chans++; | |
c56ef672 | 281 | bands_used |= BIT(req->channels[i]->band); |
4d36ec58 | 282 | } |
4d36ec58 | 283 | |
c56ef672 DS |
284 | local->hw_scan_band++; |
285 | } while (!n_chans); | |
286 | } | |
4d36ec58 | 287 | |
c56ef672 | 288 | local->hw_scan_req->req.n_channels = n_chans; |
2103dec1 | 289 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
4d36ec58 | 290 | |
c56ef672 DS |
291 | ielen = ieee80211_build_preq_ies(local, |
292 | (u8 *)local->hw_scan_req->req.ie, | |
c604b9f2 | 293 | local->hw_scan_ies_bufsize, |
c56ef672 DS |
294 | &local->hw_scan_req->ies, |
295 | req->ie, req->ie_len, | |
296 | bands_used, req->rates, &chandef); | |
297 | local->hw_scan_req->req.ie_len = ielen; | |
298 | local->hw_scan_req->req.no_cck = req->no_cck; | |
a344d677 JB |
299 | ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); |
300 | ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, | |
301 | req->mac_addr_mask); | |
4d36ec58 JB |
302 | |
303 | return true; | |
304 | } | |
305 | ||
8bd2a248 | 306 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
307 | { |
308 | struct ieee80211_local *local = hw_to_local(hw); | |
8bd2a248 | 309 | bool hw_scan = local->ops->hw_scan; |
a2b70e83 | 310 | bool was_scanning = local->scanning; |
6ea0a69c | 311 | struct cfg80211_scan_request *scan_req; |
a344d677 | 312 | struct ieee80211_sub_if_data *scan_sdata; |
0a51b27e | 313 | |
e229f844 | 314 | lockdep_assert_held(&local->mtx); |
5bc75728 | 315 | |
6d3560d4 JB |
316 | /* |
317 | * It's ok to abort a not-yet-running scan (that | |
318 | * we have one at all will be verified by checking | |
319 | * local->scan_req next), but not to complete it | |
320 | * successfully. | |
321 | */ | |
322 | if (WARN_ON(!local->scanning && !aborted)) | |
323 | aborted = true; | |
5bc75728 | 324 | |
e229f844 | 325 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 326 | return; |
de95a54b | 327 | |
c56ef672 DS |
328 | if (hw_scan && !aborted && |
329 | !(local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) && | |
330 | ieee80211_prep_hw_scan(local)) { | |
e2fd5dbc JB |
331 | int rc; |
332 | ||
333 | rc = drv_hw_scan(local, | |
334 | rcu_dereference_protected(local->scan_sdata, | |
335 | lockdep_is_held(&local->mtx)), | |
336 | local->hw_scan_req); | |
337 | ||
6eb11a9a | 338 | if (rc == 0) |
d07bfd8b | 339 | return; |
4d36ec58 JB |
340 | } |
341 | ||
342 | kfree(local->hw_scan_req); | |
343 | local->hw_scan_req = NULL; | |
f3b85252 | 344 | |
6ea0a69c JB |
345 | scan_req = rcu_dereference_protected(local->scan_req, |
346 | lockdep_is_held(&local->mtx)); | |
347 | ||
348 | if (scan_req != local->int_scan_req) | |
349 | cfg80211_scan_done(scan_req, aborted); | |
350 | RCU_INIT_POINTER(local->scan_req, NULL); | |
a344d677 JB |
351 | |
352 | scan_sdata = rcu_dereference_protected(local->scan_sdata, | |
353 | lockdep_is_held(&local->mtx)); | |
0c2bef46 | 354 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
2a519311 | 355 | |
fbe9c429 | 356 | local->scanning = 0; |
7ca15a0a | 357 | local->scan_chandef.chan = NULL; |
f3b85252 | 358 | |
07ef03ee JB |
359 | /* Set power back to normal operating levels. */ |
360 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 361 | |
8bd2a248 | 362 | if (!hw_scan) { |
e229f844 | 363 | ieee80211_configure_filter(local); |
a344d677 | 364 | drv_sw_scan_complete(local, scan_sdata); |
aacde9ee | 365 | ieee80211_offchannel_return(local); |
e229f844 | 366 | } |
0a51b27e | 367 | |
5cff20e6 | 368 | ieee80211_recalc_idle(local); |
e229f844 | 369 | |
0a51b27e | 370 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 371 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 372 | ieee80211_mesh_notify_scan_completed(local); |
a2b70e83 EP |
373 | if (was_scanning) |
374 | ieee80211_start_next_roc(local); | |
0a51b27e | 375 | } |
8789d459 JB |
376 | |
377 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
378 | { | |
379 | struct ieee80211_local *local = hw_to_local(hw); | |
380 | ||
381 | trace_api_scan_completed(local, aborted); | |
382 | ||
383 | set_bit(SCAN_COMPLETED, &local->scanning); | |
384 | if (aborted) | |
385 | set_bit(SCAN_ABORTED, &local->scanning); | |
386 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
387 | } | |
0a51b27e JB |
388 | EXPORT_SYMBOL(ieee80211_scan_completed); |
389 | ||
a344d677 JB |
390 | static int ieee80211_start_sw_scan(struct ieee80211_local *local, |
391 | struct ieee80211_sub_if_data *sdata) | |
f3b85252 | 392 | { |
fe57d9f5 JB |
393 | /* Software scan is not supported in multi-channel cases */ |
394 | if (local->use_chanctx) | |
395 | return -EOPNOTSUPP; | |
396 | ||
f3b85252 JB |
397 | /* |
398 | * Hardware/driver doesn't support hw_scan, so use software | |
399 | * scanning instead. First send a nullfunc frame with power save | |
400 | * bit on so that AP will buffer the frames for us while we are not | |
401 | * listening, then send probe requests to each channel and wait for | |
402 | * the responses. After all channels are scanned, tune back to the | |
403 | * original channel and send a nullfunc frame with power save bit | |
404 | * off to trigger the AP to send us all the buffered frames. | |
405 | * | |
406 | * Note that while local->sw_scanning is true everything else but | |
407 | * nullfunc frames and probe requests will be dropped in | |
408 | * ieee80211_tx_h_check_assoc(). | |
409 | */ | |
a344d677 | 410 | drv_sw_scan_start(local, sdata, local->scan_addr); |
f3b85252 | 411 | |
de312db3 | 412 | local->leave_oper_channel_time = jiffies; |
977923b0 | 413 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
414 | local->scan_channel_idx = 0; |
415 | ||
aacde9ee | 416 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 417 | |
9c35d7d2 | 418 | /* ensure nullfunc is transmitted before leaving operating channel */ |
39ecc01d | 419 | ieee80211_flush_queues(local, NULL); |
9c35d7d2 | 420 | |
3ac64bee | 421 | ieee80211_configure_filter(local); |
f3b85252 | 422 | |
59bdf3b0 BG |
423 | /* We need to set power level at maximum rate for scanning. */ |
424 | ieee80211_hw_config(local, 0); | |
425 | ||
42935eca | 426 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 427 | &local->scan_work, 0); |
f3b85252 JB |
428 | |
429 | return 0; | |
430 | } | |
431 | ||
133d40f9 SG |
432 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
433 | struct ieee80211_sub_if_data *sdata) | |
434 | { | |
164eb02d SW |
435 | if (local->radar_detect_enabled) |
436 | return false; | |
437 | ||
2eb278e0 | 438 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
439 | return false; |
440 | ||
441 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
392b9ffb | 442 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
133d40f9 SG |
443 | return false; |
444 | ||
445 | return true; | |
446 | } | |
447 | ||
448 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
449 | { | |
450 | lockdep_assert_held(&local->mtx); | |
451 | ||
452 | if (!local->scan_req || local->scanning) | |
453 | return; | |
454 | ||
e2fd5dbc JB |
455 | if (!ieee80211_can_scan(local, |
456 | rcu_dereference_protected( | |
457 | local->scan_sdata, | |
458 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
459 | return; |
460 | ||
461 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
462 | round_jiffies_relative(0)); | |
463 | } | |
f3b85252 | 464 | |
8a690674 BG |
465 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
466 | unsigned long *next_delay) | |
467 | { | |
468 | int i; | |
e2fd5dbc | 469 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 470 | struct cfg80211_scan_request *scan_req; |
675a0b04 | 471 | enum ieee80211_band band = local->hw.conf.chandef.chan->band; |
6c17b77b SF |
472 | u32 tx_flags; |
473 | ||
6ea0a69c JB |
474 | scan_req = rcu_dereference_protected(local->scan_req, |
475 | lockdep_is_held(&local->mtx)); | |
476 | ||
6c17b77b | 477 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
6ea0a69c | 478 | if (scan_req->no_cck) |
6c17b77b | 479 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
8a690674 | 480 | |
e2fd5dbc | 481 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 482 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 483 | |
6ea0a69c | 484 | for (i = 0; i < scan_req->n_ssids; i++) |
8a690674 | 485 | ieee80211_send_probe_req( |
a344d677 | 486 | sdata, local->scan_addr, NULL, |
6ea0a69c JB |
487 | scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, |
488 | scan_req->ie, scan_req->ie_len, | |
489 | scan_req->rates[band], false, | |
675a0b04 | 490 | tx_flags, local->hw.conf.chandef.chan, true); |
8a690674 BG |
491 | |
492 | /* | |
493 | * After sending probe requests, wait for probe responses | |
494 | * on the channel. | |
495 | */ | |
496 | *next_delay = IEEE80211_CHANNEL_TIME; | |
497 | local->next_scan_state = SCAN_DECISION; | |
498 | } | |
499 | ||
f3b85252 JB |
500 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
501 | struct cfg80211_scan_request *req) | |
502 | { | |
503 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
504 | int rc; |
505 | ||
e229f844 SG |
506 | lockdep_assert_held(&local->mtx); |
507 | ||
f3b85252 JB |
508 | if (local->scan_req) |
509 | return -EBUSY; | |
510 | ||
133d40f9 | 511 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 512 | /* wait for the work to finish/time out */ |
6ea0a69c | 513 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 514 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
515 | return 0; |
516 | } | |
517 | ||
f3b85252 JB |
518 | if (local->ops->hw_scan) { |
519 | u8 *ies; | |
f3b85252 | 520 | |
e4dcbb37 | 521 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
c56ef672 DS |
522 | |
523 | if (local->hw.flags & IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS) { | |
524 | int i, n_bands = 0; | |
525 | u8 bands_counted = 0; | |
526 | ||
527 | for (i = 0; i < req->n_channels; i++) { | |
528 | if (bands_counted & BIT(req->channels[i]->band)) | |
529 | continue; | |
530 | bands_counted |= BIT(req->channels[i]->band); | |
531 | n_bands++; | |
532 | } | |
533 | ||
534 | local->hw_scan_ies_bufsize *= n_bands; | |
535 | } | |
536 | ||
4d36ec58 JB |
537 | local->hw_scan_req = kmalloc( |
538 | sizeof(*local->hw_scan_req) + | |
539 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 540 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 541 | if (!local->hw_scan_req) |
f3b85252 JB |
542 | return -ENOMEM; |
543 | ||
c56ef672 DS |
544 | local->hw_scan_req->req.ssids = req->ssids; |
545 | local->hw_scan_req->req.n_ssids = req->n_ssids; | |
4d36ec58 JB |
546 | ies = (u8 *)local->hw_scan_req + |
547 | sizeof(*local->hw_scan_req) + | |
548 | req->n_channels * sizeof(req->channels[0]); | |
c56ef672 DS |
549 | local->hw_scan_req->req.ie = ies; |
550 | local->hw_scan_req->req.flags = req->flags; | |
4d36ec58 JB |
551 | |
552 | local->hw_scan_band = 0; | |
6e7e6213 JL |
553 | |
554 | /* | |
555 | * After allocating local->hw_scan_req, we must | |
556 | * go through until ieee80211_prep_hw_scan(), so | |
557 | * anything that might be changed here and leave | |
558 | * this function early must not go after this | |
559 | * allocation. | |
560 | */ | |
f3b85252 JB |
561 | } |
562 | ||
6ea0a69c | 563 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 564 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 565 | |
a344d677 JB |
566 | if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
567 | get_random_mask_addr(local->scan_addr, | |
568 | req->mac_addr, | |
569 | req->mac_addr_mask); | |
570 | else | |
571 | memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); | |
572 | ||
8a690674 | 573 | if (local->ops->hw_scan) { |
fbe9c429 | 574 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 575 | } else if ((req->n_channels == 1) && |
675a0b04 | 576 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
577 | /* |
578 | * If we are scanning only on the operating channel | |
579 | * then we do not need to stop normal activities | |
8a690674 BG |
580 | */ |
581 | unsigned long next_delay; | |
582 | ||
583 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
584 | ||
585 | ieee80211_recalc_idle(local); | |
586 | ||
587 | /* Notify driver scan is starting, keep order of operations | |
588 | * same as normal software scan, in case that matters. */ | |
a344d677 | 589 | drv_sw_scan_start(local, sdata, local->scan_addr); |
8a690674 BG |
590 | |
591 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
592 | ||
593 | /* We need to ensure power level is at max for scanning. */ | |
594 | ieee80211_hw_config(local, 0); | |
595 | ||
596 | if ((req->channels[0]->flags & | |
8fe02e16 | 597 | IEEE80211_CHAN_NO_IR) || |
6ea0a69c | 598 | !req->n_ssids) { |
8a690674 BG |
599 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
600 | } else { | |
601 | ieee80211_scan_state_send_probe(local, &next_delay); | |
602 | next_delay = IEEE80211_CHANNEL_TIME; | |
603 | } | |
604 | ||
605 | /* Now, just wait a bit and we are all done! */ | |
606 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
607 | next_delay); | |
608 | return 0; | |
609 | } else { | |
610 | /* Do normal software scan */ | |
fbe9c429 | 611 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 612 | } |
6e7e6213 | 613 | |
5cff20e6 | 614 | ieee80211_recalc_idle(local); |
f3b85252 | 615 | |
4d36ec58 JB |
616 | if (local->ops->hw_scan) { |
617 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 618 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
a344d677 JB |
619 | } else { |
620 | rc = ieee80211_start_sw_scan(local, sdata); | |
621 | } | |
f3b85252 | 622 | |
f3b85252 | 623 | if (rc) { |
4d36ec58 JB |
624 | kfree(local->hw_scan_req); |
625 | local->hw_scan_req = NULL; | |
fbe9c429 | 626 | local->scanning = 0; |
f3b85252 | 627 | |
5cff20e6 JB |
628 | ieee80211_recalc_idle(local); |
629 | ||
f3b85252 | 630 | local->scan_req = NULL; |
0c2bef46 | 631 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 JB |
632 | } |
633 | ||
634 | return rc; | |
635 | } | |
636 | ||
df13cce5 HS |
637 | static unsigned long |
638 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
639 | { | |
640 | /* | |
641 | * TODO: channel switching also consumes quite some time, | |
642 | * add that delay as well to get a better estimation | |
643 | */ | |
8fe02e16 | 644 | if (chan->flags & IEEE80211_CHAN_NO_IR) |
df13cce5 HS |
645 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
646 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
647 | } | |
648 | ||
e229f844 SG |
649 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
650 | unsigned long *next_delay) | |
7d3be3cc | 651 | { |
142b9f50 | 652 | bool associated = false; |
df13cce5 HS |
653 | bool tx_empty = true; |
654 | bool bad_latency; | |
142b9f50 | 655 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 656 | struct ieee80211_channel *next_chan; |
cd2bb512 | 657 | enum mac80211_scan_state next_scan_state; |
6ea0a69c | 658 | struct cfg80211_scan_request *scan_req; |
142b9f50 | 659 | |
df13cce5 HS |
660 | /* |
661 | * check if at least one STA interface is associated, | |
662 | * check if at least one STA interface has pending tx frames | |
663 | * and grab the lowest used beacon interval | |
664 | */ | |
142b9f50 HS |
665 | mutex_lock(&local->iflist_mtx); |
666 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 667 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
668 | continue; |
669 | ||
670 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
671 | if (sdata->u.mgd.associated) { | |
672 | associated = true; | |
df13cce5 | 673 | |
df13cce5 HS |
674 | if (!qdisc_all_tx_empty(sdata->dev)) { |
675 | tx_empty = false; | |
676 | break; | |
677 | } | |
142b9f50 HS |
678 | } |
679 | } | |
680 | } | |
681 | mutex_unlock(&local->iflist_mtx); | |
682 | ||
6ea0a69c JB |
683 | scan_req = rcu_dereference_protected(local->scan_req, |
684 | lockdep_is_held(&local->mtx)); | |
685 | ||
686 | next_chan = scan_req->channels[local->scan_channel_idx]; | |
b23b025f | 687 | |
a80f7c0b | 688 | /* |
07ef03ee JB |
689 | * we're currently scanning a different channel, let's |
690 | * see if we can scan another channel without interfering | |
691 | * with the current traffic situation. | |
692 | * | |
3f892b61 | 693 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 694 | */ |
a80f7c0b | 695 | |
07ef03ee | 696 | bad_latency = time_after(jiffies + |
3f892b61 SG |
697 | ieee80211_scan_get_channel_time(next_chan), |
698 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 699 | |
cd2bb512 | 700 | if (associated && !tx_empty) { |
6ea0a69c | 701 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
cd2bb512 SL |
702 | next_scan_state = SCAN_ABORT; |
703 | else | |
704 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 705 | } else if (associated && bad_latency) { |
cd2bb512 SL |
706 | next_scan_state = SCAN_SUSPEND; |
707 | } else { | |
708 | next_scan_state = SCAN_SET_CHANNEL; | |
709 | } | |
710 | ||
711 | local->next_scan_state = next_scan_state; | |
142b9f50 | 712 | |
07ef03ee | 713 | *next_delay = 0; |
142b9f50 HS |
714 | } |
715 | ||
2fb3f028 HS |
716 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
717 | unsigned long *next_delay) | |
718 | { | |
719 | int skip; | |
720 | struct ieee80211_channel *chan; | |
7ca15a0a | 721 | enum nl80211_bss_scan_width oper_scan_width; |
6ea0a69c JB |
722 | struct cfg80211_scan_request *scan_req; |
723 | ||
724 | scan_req = rcu_dereference_protected(local->scan_req, | |
725 | lockdep_is_held(&local->mtx)); | |
2fb3f028 | 726 | |
7d3be3cc | 727 | skip = 0; |
6ea0a69c | 728 | chan = scan_req->channels[local->scan_channel_idx]; |
7d3be3cc | 729 | |
7ca15a0a SW |
730 | local->scan_chandef.chan = chan; |
731 | local->scan_chandef.center_freq1 = chan->center_freq; | |
732 | local->scan_chandef.center_freq2 = 0; | |
6ea0a69c | 733 | switch (scan_req->scan_width) { |
7ca15a0a SW |
734 | case NL80211_BSS_CHAN_WIDTH_5: |
735 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; | |
736 | break; | |
737 | case NL80211_BSS_CHAN_WIDTH_10: | |
738 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; | |
739 | break; | |
740 | case NL80211_BSS_CHAN_WIDTH_20: | |
741 | /* If scanning on oper channel, use whatever channel-type | |
742 | * is currently in use. | |
743 | */ | |
744 | oper_scan_width = cfg80211_chandef_to_scan_width( | |
745 | &local->_oper_chandef); | |
746 | if (chan == local->_oper_chandef.chan && | |
6ea0a69c | 747 | oper_scan_width == scan_req->scan_width) |
7ca15a0a SW |
748 | local->scan_chandef = local->_oper_chandef; |
749 | else | |
750 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; | |
751 | break; | |
752 | } | |
b23b025f | 753 | |
07ef03ee JB |
754 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
755 | skip = 1; | |
7d3be3cc | 756 | |
7d3be3cc HS |
757 | /* advance state machine to next channel/band */ |
758 | local->scan_channel_idx++; | |
759 | ||
0ee9c13c HS |
760 | if (skip) { |
761 | /* if we skip this channel return to the decision state */ | |
762 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 763 | return; |
0ee9c13c | 764 | } |
7d3be3cc HS |
765 | |
766 | /* | |
767 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
768 | * (which unfortunately doesn't say _why_ step a) is done, | |
769 | * but it waits for the probe delay or until a frame is | |
770 | * received - and the received frame would update the NAV). | |
771 | * For now, we do not support waiting until a frame is | |
772 | * received. | |
773 | * | |
774 | * In any case, it is not necessary for a passive scan. | |
775 | */ | |
6ea0a69c | 776 | if (chan->flags & IEEE80211_CHAN_NO_IR || !scan_req->n_ssids) { |
7d3be3cc | 777 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
977923b0 | 778 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 779 | return; |
7d3be3cc HS |
780 | } |
781 | ||
2fb3f028 | 782 | /* active scan, send probes */ |
7d3be3cc | 783 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 784 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
785 | } |
786 | ||
07ef03ee JB |
787 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
788 | unsigned long *next_delay) | |
789 | { | |
790 | /* switch back to the operating channel */ | |
7ca15a0a | 791 | local->scan_chandef.chan = NULL; |
07ef03ee JB |
792 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
793 | ||
aacde9ee SG |
794 | /* disable PS */ |
795 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
796 | |
797 | *next_delay = HZ / 5; | |
798 | /* afterwards, resume scan & go to next channel */ | |
799 | local->next_scan_state = SCAN_RESUME; | |
800 | } | |
801 | ||
802 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
803 | unsigned long *next_delay) | |
804 | { | |
aacde9ee | 805 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
806 | |
807 | if (local->ops->flush) { | |
39ecc01d | 808 | ieee80211_flush_queues(local, NULL); |
07ef03ee JB |
809 | *next_delay = 0; |
810 | } else | |
811 | *next_delay = HZ / 10; | |
812 | ||
813 | /* remember when we left the operating channel */ | |
814 | local->leave_oper_channel_time = jiffies; | |
815 | ||
816 | /* advance to the next channel to be scanned */ | |
de2ee84d | 817 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
818 | } |
819 | ||
c2b13452 | 820 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
821 | { |
822 | struct ieee80211_local *local = | |
823 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 824 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 825 | struct cfg80211_scan_request *scan_req; |
0a51b27e | 826 | unsigned long next_delay = 0; |
8bd2a248 | 827 | bool aborted; |
0a51b27e | 828 | |
259b62e3 | 829 | mutex_lock(&local->mtx); |
8789d459 | 830 | |
e2fd5dbc JB |
831 | sdata = rcu_dereference_protected(local->scan_sdata, |
832 | lockdep_is_held(&local->mtx)); | |
6ea0a69c JB |
833 | scan_req = rcu_dereference_protected(local->scan_req, |
834 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 835 | |
8a690674 BG |
836 | /* When scanning on-channel, the first-callback means completed. */ |
837 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
838 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
839 | goto out_complete; | |
840 | } | |
841 | ||
259b62e3 | 842 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 843 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 844 | goto out_complete; |
8789d459 JB |
845 | } |
846 | ||
6ea0a69c | 847 | if (!sdata || !scan_req) |
259b62e3 | 848 | goto out; |
f3b85252 | 849 | |
ff5db439 | 850 | if (!local->scanning) { |
f3b85252 JB |
851 | int rc; |
852 | ||
6ea0a69c | 853 | RCU_INIT_POINTER(local->scan_req, NULL); |
0c2bef46 | 854 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 | 855 | |
6ea0a69c | 856 | rc = __ieee80211_start_scan(sdata, scan_req); |
259b62e3 | 857 | if (rc) { |
3aed49ef | 858 | /* need to complete scan in cfg80211 */ |
6ea0a69c | 859 | rcu_assign_pointer(local->scan_req, scan_req); |
259b62e3 SG |
860 | aborted = true; |
861 | goto out_complete; | |
862 | } else | |
863 | goto out; | |
f3b85252 JB |
864 | } |
865 | ||
f502d09b HS |
866 | /* |
867 | * as long as no delay is required advance immediately | |
868 | * without scheduling a new work | |
869 | */ | |
870 | do { | |
c29acf20 RM |
871 | if (!ieee80211_sdata_running(sdata)) { |
872 | aborted = true; | |
873 | goto out_complete; | |
874 | } | |
875 | ||
977923b0 | 876 | switch (local->next_scan_state) { |
2fb3f028 | 877 | case SCAN_DECISION: |
e229f844 | 878 | /* if no more bands/channels left, complete scan */ |
6ea0a69c | 879 | if (local->scan_channel_idx >= scan_req->n_channels) { |
e229f844 SG |
880 | aborted = false; |
881 | goto out_complete; | |
882 | } | |
883 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 884 | break; |
2fb3f028 HS |
885 | case SCAN_SET_CHANNEL: |
886 | ieee80211_scan_state_set_channel(local, &next_delay); | |
887 | break; | |
f502d09b HS |
888 | case SCAN_SEND_PROBE: |
889 | ieee80211_scan_state_send_probe(local, &next_delay); | |
890 | break; | |
07ef03ee JB |
891 | case SCAN_SUSPEND: |
892 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 893 | break; |
07ef03ee JB |
894 | case SCAN_RESUME: |
895 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 896 | break; |
cd2bb512 SL |
897 | case SCAN_ABORT: |
898 | aborted = true; | |
899 | goto out_complete; | |
f502d09b HS |
900 | } |
901 | } while (next_delay == 0); | |
0a51b27e | 902 | |
42935eca | 903 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 904 | goto out; |
259b62e3 SG |
905 | |
906 | out_complete: | |
8bd2a248 | 907 | __ieee80211_scan_completed(&local->hw, aborted); |
259b62e3 SG |
908 | out: |
909 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
910 | } |
911 | ||
f3b85252 JB |
912 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
913 | struct cfg80211_scan_request *req) | |
0a51b27e | 914 | { |
f3b85252 | 915 | int res; |
de95a54b | 916 | |
a1699b75 | 917 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 918 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 919 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 920 | |
f3b85252 | 921 | return res; |
0a51b27e JB |
922 | } |
923 | ||
34bcf715 SG |
924 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
925 | const u8 *ssid, u8 ssid_len, | |
7ca15a0a SW |
926 | struct ieee80211_channel *chan, |
927 | enum nl80211_bss_scan_width scan_width) | |
0a51b27e | 928 | { |
0a51b27e | 929 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 930 | int ret = -EBUSY; |
fb63bc41 | 931 | enum ieee80211_band band; |
2a519311 | 932 | |
a1699b75 | 933 | mutex_lock(&local->mtx); |
0a51b27e | 934 | |
f3b85252 JB |
935 | /* busy scanning */ |
936 | if (local->scan_req) | |
937 | goto unlock; | |
9116dd01 | 938 | |
be4a4b6a JB |
939 | /* fill internal scan request */ |
940 | if (!chan) { | |
34bcf715 SG |
941 | int i, max_n; |
942 | int n_ch = 0; | |
be4a4b6a JB |
943 | |
944 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
945 | if (!local->hw.wiphy->bands[band]) | |
946 | continue; | |
34bcf715 SG |
947 | |
948 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
949 | for (i = 0; i < max_n; i++) { | |
950 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 951 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 | 952 | |
8fe02e16 | 953 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
954 | IEEE80211_CHAN_DISABLED)) |
955 | continue; | |
956 | ||
957 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
958 | n_ch++; | |
be4a4b6a JB |
959 | } |
960 | } | |
961 | ||
34bcf715 SG |
962 | if (WARN_ON_ONCE(n_ch == 0)) |
963 | goto unlock; | |
964 | ||
965 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 966 | } else { |
8fe02e16 | 967 | if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
968 | IEEE80211_CHAN_DISABLED))) |
969 | goto unlock; | |
970 | ||
be4a4b6a JB |
971 | local->int_scan_req->channels[0] = chan; |
972 | local->int_scan_req->n_channels = 1; | |
973 | } | |
974 | ||
975 | local->int_scan_req->ssids = &local->scan_ssid; | |
976 | local->int_scan_req->n_ssids = 1; | |
7ca15a0a | 977 | local->int_scan_req->scan_width = scan_width; |
5ba63533 JB |
978 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
979 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 980 | |
5ba63533 | 981 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 982 | unlock: |
a1699b75 | 983 | mutex_unlock(&local->mtx); |
f3b85252 | 984 | return ret; |
0a51b27e | 985 | } |
5bb644a0 | 986 | |
4136c422 SG |
987 | /* |
988 | * Only call this function when a scan can't be queued -- under RTNL. | |
989 | */ | |
5bb644a0 JB |
990 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
991 | { | |
5bb644a0 | 992 | /* |
b856439b | 993 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
994 | * yet really started (see __ieee80211_start_scan ). |
995 | * | |
996 | * Regarding hardware scan: | |
997 | * - we can not call __ieee80211_scan_completed() as when | |
998 | * SCAN_HW_SCANNING bit is set this function change | |
999 | * local->hw_scan_req to operate on 5G band, what race with | |
1000 | * driver which can use local->hw_scan_req | |
1001 | * | |
1002 | * - we can not cancel scan_work since driver can schedule it | |
1003 | * by ieee80211_scan_completed(..., true) to finish scan | |
1004 | * | |
b856439b EP |
1005 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
1006 | * driver is still responsible for calling ieee80211_scan_completed() | |
1007 | * after the scan was completed/aborted. | |
5bb644a0 | 1008 | */ |
4136c422 | 1009 | |
a1699b75 | 1010 | mutex_lock(&local->mtx); |
b856439b EP |
1011 | if (!local->scan_req) |
1012 | goto out; | |
1013 | ||
a754055a EG |
1014 | /* |
1015 | * We have a scan running and the driver already reported completion, | |
1016 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
1017 | * cancelled. | |
1018 | */ | |
1019 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
1020 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
1021 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
1022 | goto out; | |
1023 | } | |
1024 | ||
b856439b | 1025 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
a754055a EG |
1026 | /* |
1027 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
1028 | * scan on another band. | |
1029 | */ | |
1030 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 1031 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
1032 | drv_cancel_hw_scan(local, |
1033 | rcu_dereference_protected(local->scan_sdata, | |
1034 | lockdep_is_held(&local->mtx))); | |
b856439b | 1035 | goto out; |
4136c422 | 1036 | } |
b856439b EP |
1037 | |
1038 | /* | |
1039 | * If the work is currently running, it must be blocked on | |
1040 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
1041 | * simply exit once it acquires the mutex. | |
1042 | */ | |
1043 | cancel_delayed_work(&local->scan_work); | |
1044 | /* and clean up */ | |
8bd2a248 | 1045 | __ieee80211_scan_completed(&local->hw, true); |
b856439b | 1046 | out: |
d07bfd8b | 1047 | mutex_unlock(&local->mtx); |
5bb644a0 | 1048 | } |
79f460ca | 1049 | |
d43c6b6e DS |
1050 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1051 | struct cfg80211_sched_scan_request *req) | |
79f460ca LC |
1052 | { |
1053 | struct ieee80211_local *local = sdata->local; | |
633e2713 | 1054 | struct ieee80211_scan_ies sched_scan_ies = {}; |
2103dec1 | 1055 | struct cfg80211_chan_def chandef; |
633e2713 DS |
1056 | int ret, i, iebufsz, num_bands = 0; |
1057 | u32 rate_masks[IEEE80211_NUM_BANDS] = {}; | |
1058 | u8 bands_used = 0; | |
1059 | u8 *ie; | |
1060 | size_t len; | |
c604b9f2 | 1061 | |
e4dcbb37 | 1062 | iebufsz = local->scan_ies_len + req->ie_len; |
79f460ca | 1063 | |
d43c6b6e | 1064 | lockdep_assert_held(&local->mtx); |
79f460ca | 1065 | |
d43c6b6e DS |
1066 | if (!local->ops->sched_scan_start) |
1067 | return -ENOTSUPP; | |
79f460ca LC |
1068 | |
1069 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
633e2713 DS |
1070 | if (local->hw.wiphy->bands[i]) { |
1071 | bands_used |= BIT(i); | |
1072 | rate_masks[i] = (u32) -1; | |
1073 | num_bands++; | |
79f460ca | 1074 | } |
633e2713 | 1075 | } |
79f460ca | 1076 | |
633e2713 DS |
1077 | ie = kzalloc(num_bands * iebufsz, GFP_KERNEL); |
1078 | if (!ie) { | |
1079 | ret = -ENOMEM; | |
1080 | goto out; | |
79f460ca LC |
1081 | } |
1082 | ||
633e2713 DS |
1083 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
1084 | ||
1085 | len = ieee80211_build_preq_ies(local, ie, num_bands * iebufsz, | |
1086 | &sched_scan_ies, req->ie, | |
1087 | req->ie_len, bands_used, | |
1088 | rate_masks, &chandef); | |
1089 | ||
30dd3edf | 1090 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
d43c6b6e | 1091 | if (ret == 0) { |
5260a5b2 | 1092 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
6ea0a69c | 1093 | rcu_assign_pointer(local->sched_scan_req, req); |
d43c6b6e | 1094 | } |
79f460ca | 1095 | |
633e2713 | 1096 | kfree(ie); |
d43c6b6e | 1097 | |
633e2713 | 1098 | out: |
d43c6b6e DS |
1099 | if (ret) { |
1100 | /* Clean in case of failure after HW restart or upon resume. */ | |
0c2bef46 | 1101 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
6ea0a69c | 1102 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e DS |
1103 | } |
1104 | ||
1105 | return ret; | |
1106 | } | |
1107 | ||
1108 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
1109 | struct cfg80211_sched_scan_request *req) | |
1110 | { | |
1111 | struct ieee80211_local *local = sdata->local; | |
1112 | int ret; | |
1113 | ||
1114 | mutex_lock(&local->mtx); | |
1115 | ||
1116 | if (rcu_access_pointer(local->sched_scan_sdata)) { | |
1117 | mutex_unlock(&local->mtx); | |
1118 | return -EBUSY; | |
1119 | } | |
1120 | ||
1121 | ret = __ieee80211_request_sched_scan_start(sdata, req); | |
1122 | ||
5260a5b2 | 1123 | mutex_unlock(&local->mtx); |
79f460ca LC |
1124 | return ret; |
1125 | } | |
1126 | ||
85a9994a | 1127 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) |
79f460ca LC |
1128 | { |
1129 | struct ieee80211_local *local = sdata->local; | |
30dd3edf | 1130 | int ret = 0; |
79f460ca | 1131 | |
5260a5b2 | 1132 | mutex_lock(&local->mtx); |
79f460ca LC |
1133 | |
1134 | if (!local->ops->sched_scan_stop) { | |
1135 | ret = -ENOTSUPP; | |
1136 | goto out; | |
1137 | } | |
1138 | ||
d43c6b6e | 1139 | /* We don't want to restart sched scan anymore. */ |
6ea0a69c | 1140 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1141 | |
71228a1e | 1142 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
37e3308c | 1143 | ret = drv_sched_scan_stop(local, sdata); |
71228a1e | 1144 | if (!ret) |
ad053a96 | 1145 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
71228a1e | 1146 | } |
79f460ca | 1147 | out: |
5260a5b2 | 1148 | mutex_unlock(&local->mtx); |
79f460ca LC |
1149 | |
1150 | return ret; | |
1151 | } | |
1152 | ||
1153 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1154 | { | |
1155 | struct ieee80211_local *local = hw_to_local(hw); | |
1156 | ||
1157 | trace_api_sched_scan_results(local); | |
1158 | ||
1159 | cfg80211_sched_scan_results(hw->wiphy); | |
1160 | } | |
1161 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1162 | ||
f6837ba8 | 1163 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
85a9994a | 1164 | { |
85a9994a LC |
1165 | mutex_lock(&local->mtx); |
1166 | ||
5260a5b2 | 1167 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1168 | mutex_unlock(&local->mtx); |
1169 | return; | |
1170 | } | |
1171 | ||
0c2bef46 | 1172 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
85a9994a | 1173 | |
d43c6b6e | 1174 | /* If sched scan was aborted by the driver. */ |
6ea0a69c | 1175 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1176 | |
85a9994a LC |
1177 | mutex_unlock(&local->mtx); |
1178 | ||
1179 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
1180 | } | |
1181 | ||
f6837ba8 JB |
1182 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1183 | { | |
1184 | struct ieee80211_local *local = | |
1185 | container_of(work, struct ieee80211_local, | |
1186 | sched_scan_stopped_work); | |
1187 | ||
1188 | ieee80211_sched_scan_end(local); | |
1189 | } | |
1190 | ||
79f460ca LC |
1191 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1192 | { | |
1193 | struct ieee80211_local *local = hw_to_local(hw); | |
1194 | ||
1195 | trace_api_sched_scan_stopped(local); | |
1196 | ||
18db594a | 1197 | schedule_work(&local->sched_scan_stopped_work); |
79f460ca LC |
1198 | } |
1199 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |