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> | |
74d803b6 | 9 | * Copyright 2013-2015 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 | 71 | s32 signal = 0; |
74d803b6 | 72 | bool signal_valid; |
2a519311 | 73 | |
30686bf7 | 74 | if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) |
2a519311 | 75 | signal = rx_status->signal * 100; |
30686bf7 | 76 | else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) |
2a519311 | 77 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 78 | |
7ca15a0a SW |
79 | scan_width = NL80211_BSS_CHAN_WIDTH_20; |
80 | if (rx_status->flag & RX_FLAG_5MHZ) | |
81 | scan_width = NL80211_BSS_CHAN_WIDTH_5; | |
82 | if (rx_status->flag & RX_FLAG_10MHZ) | |
83 | scan_width = NL80211_BSS_CHAN_WIDTH_10; | |
84 | ||
85 | cbss = cfg80211_inform_bss_width_frame(local->hw.wiphy, channel, | |
86 | scan_width, mgmt, len, signal, | |
87 | GFP_ATOMIC); | |
0c1ad2ca | 88 | if (!cbss) |
00d3f14c | 89 | return NULL; |
74d803b6 SS |
90 | /* In case the signal is invalid update the status */ |
91 | signal_valid = abs(channel->center_freq - cbss->channel->center_freq) | |
92 | <= local->hw.wiphy->max_adj_channel_rssi_comp; | |
93 | if (!signal_valid) | |
94 | rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; | |
00d3f14c | 95 | |
0c1ad2ca | 96 | bss = (void *)cbss->priv; |
5484e237 | 97 | |
ef429dad JB |
98 | if (beacon) |
99 | bss->device_ts_beacon = rx_status->device_timestamp; | |
100 | else | |
101 | bss->device_ts_presp = rx_status->device_timestamp; | |
8c358bcd | 102 | |
fcff4f10 PS |
103 | if (elems->parse_error) { |
104 | if (beacon) | |
105 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
106 | else | |
107 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
108 | } else { | |
109 | if (beacon) | |
110 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
111 | else | |
112 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
113 | } | |
114 | ||
5484e237 | 115 | /* save the ERP value so that it is available at association time */ |
1946bed9 JB |
116 | if (elems->erp_info && (!elems->parse_error || |
117 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 118 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 119 | bss->has_erp_value = true; |
fcff4f10 PS |
120 | if (!elems->parse_error) |
121 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
122 | } |
123 | ||
f0b058b6 | 124 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
125 | if (!elems->parse_error || |
126 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
127 | srlen = 0; | |
128 | if (elems->supp_rates) { | |
129 | clen = IEEE80211_MAX_SUPP_RATES; | |
130 | if (clen > elems->supp_rates_len) | |
131 | clen = elems->supp_rates_len; | |
132 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
133 | srlen += clen; | |
134 | } | |
135 | if (elems->ext_supp_rates) { | |
136 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
137 | if (clen > elems->ext_supp_rates_len) | |
138 | clen = elems->ext_supp_rates_len; | |
139 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
140 | clen); | |
141 | srlen += clen; | |
142 | } | |
143 | if (srlen) { | |
144 | bss->supp_rates_len = srlen; | |
145 | if (!elems->parse_error) | |
146 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
147 | } | |
5484e237 | 148 | } |
5484e237 | 149 | |
fcff4f10 PS |
150 | if (!elems->parse_error || |
151 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
152 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
153 | bss->uapsd_supported = is_uapsd_supported(elems); | |
154 | if (!elems->parse_error) | |
155 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
156 | } | |
5484e237 | 157 | |
817cee76 AB |
158 | if (beacon) { |
159 | struct ieee80211_supported_band *sband = | |
160 | local->hw.wiphy->bands[rx_status->band]; | |
161 | if (!(rx_status->flag & RX_FLAG_HT) && | |
162 | !(rx_status->flag & RX_FLAG_VHT)) | |
163 | bss->beacon_rate = | |
164 | &sband->bitrates[rx_status->rate_idx]; | |
165 | } | |
166 | ||
5484e237 JB |
167 | return bss; |
168 | } | |
0a51b27e | 169 | |
d48b2968 | 170 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 171 | { |
f1d58c25 | 172 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
173 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
174 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 175 | struct ieee80211_bss *bss; |
98c8fccf JB |
176 | u8 *elements; |
177 | struct ieee80211_channel *channel; | |
178 | size_t baselen; | |
98c8fccf JB |
179 | struct ieee802_11_elems elems; |
180 | ||
d48b2968 JB |
181 | if (skb->len < 24 || |
182 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
183 | !ieee80211_is_beacon(mgmt->frame_control))) | |
184 | return; | |
98c8fccf | 185 | |
d48b2968 JB |
186 | sdata1 = rcu_dereference(local->scan_sdata); |
187 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 188 | |
d48b2968 JB |
189 | if (likely(!sdata1 && !sdata2)) |
190 | return; | |
98c8fccf | 191 | |
d48b2968 | 192 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
a344d677 JB |
193 | struct cfg80211_scan_request *scan_req; |
194 | struct cfg80211_sched_scan_request *sched_scan_req; | |
195 | ||
196 | scan_req = rcu_dereference(local->scan_req); | |
197 | sched_scan_req = rcu_dereference(local->sched_scan_req); | |
198 | ||
199 | /* ignore ProbeResp to foreign address unless scanning | |
200 | * with randomised address | |
201 | */ | |
202 | if (!(sdata1 && | |
203 | (ether_addr_equal(mgmt->da, sdata1->vif.addr) || | |
204 | scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)) && | |
205 | !(sdata2 && | |
206 | (ether_addr_equal(mgmt->da, sdata2->vif.addr) || | |
207 | sched_scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR))) | |
d48b2968 | 208 | return; |
98c8fccf | 209 | |
98c8fccf JB |
210 | elements = mgmt->u.probe_resp.variable; |
211 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
212 | } else { | |
98c8fccf JB |
213 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
214 | elements = mgmt->u.beacon.variable; | |
215 | } | |
216 | ||
98c8fccf | 217 | if (baselen > skb->len) |
d48b2968 | 218 | return; |
98c8fccf | 219 | |
b2e506bf | 220 | ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); |
98c8fccf | 221 | |
0172bb75 | 222 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
223 | |
224 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 225 | return; |
98c8fccf | 226 | |
d48b2968 | 227 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 228 | mgmt, skb->len, &elems, |
d45c4172 | 229 | channel); |
d048e503 | 230 | if (bss) |
d48b2968 | 231 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
232 | } |
233 | ||
2103dec1 SW |
234 | static void |
235 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, | |
236 | enum nl80211_bss_scan_width scan_width) | |
237 | { | |
238 | memset(chandef, 0, sizeof(*chandef)); | |
239 | switch (scan_width) { | |
240 | case NL80211_BSS_CHAN_WIDTH_5: | |
241 | chandef->width = NL80211_CHAN_WIDTH_5; | |
242 | break; | |
243 | case NL80211_BSS_CHAN_WIDTH_10: | |
244 | chandef->width = NL80211_CHAN_WIDTH_10; | |
245 | break; | |
246 | default: | |
247 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
248 | break; | |
249 | } | |
250 | } | |
251 | ||
4d36ec58 JB |
252 | /* return false if no more work */ |
253 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
254 | { | |
6ea0a69c | 255 | struct cfg80211_scan_request *req; |
2103dec1 | 256 | struct cfg80211_chan_def chandef; |
c56ef672 | 257 | u8 bands_used = 0; |
4d36ec58 JB |
258 | int i, ielen, n_chans; |
259 | ||
6ea0a69c JB |
260 | req = rcu_dereference_protected(local->scan_req, |
261 | lockdep_is_held(&local->mtx)); | |
262 | ||
a754055a EG |
263 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
264 | return false; | |
265 | ||
30686bf7 | 266 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
4d36ec58 | 267 | for (i = 0; i < req->n_channels; i++) { |
c56ef672 DS |
268 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
269 | bands_used |= BIT(req->channels[i]->band); | |
270 | } | |
271 | ||
272 | n_chans = req->n_channels; | |
273 | } else { | |
274 | do { | |
275 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
276 | return false; | |
277 | ||
278 | n_chans = 0; | |
279 | ||
280 | for (i = 0; i < req->n_channels; i++) { | |
281 | if (req->channels[i]->band != | |
282 | local->hw_scan_band) | |
283 | continue; | |
284 | local->hw_scan_req->req.channels[n_chans] = | |
4d36ec58 JB |
285 | req->channels[i]; |
286 | n_chans++; | |
c56ef672 | 287 | bands_used |= BIT(req->channels[i]->band); |
4d36ec58 | 288 | } |
4d36ec58 | 289 | |
c56ef672 DS |
290 | local->hw_scan_band++; |
291 | } while (!n_chans); | |
292 | } | |
4d36ec58 | 293 | |
c56ef672 | 294 | local->hw_scan_req->req.n_channels = n_chans; |
2103dec1 | 295 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
4d36ec58 | 296 | |
c56ef672 DS |
297 | ielen = ieee80211_build_preq_ies(local, |
298 | (u8 *)local->hw_scan_req->req.ie, | |
c604b9f2 | 299 | local->hw_scan_ies_bufsize, |
c56ef672 DS |
300 | &local->hw_scan_req->ies, |
301 | req->ie, req->ie_len, | |
302 | bands_used, req->rates, &chandef); | |
303 | local->hw_scan_req->req.ie_len = ielen; | |
304 | local->hw_scan_req->req.no_cck = req->no_cck; | |
a344d677 JB |
305 | ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); |
306 | ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, | |
307 | req->mac_addr_mask); | |
4d36ec58 JB |
308 | |
309 | return true; | |
310 | } | |
311 | ||
8bd2a248 | 312 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
313 | { |
314 | struct ieee80211_local *local = hw_to_local(hw); | |
8bd2a248 | 315 | bool hw_scan = local->ops->hw_scan; |
a2b70e83 | 316 | bool was_scanning = local->scanning; |
6ea0a69c | 317 | struct cfg80211_scan_request *scan_req; |
a344d677 | 318 | struct ieee80211_sub_if_data *scan_sdata; |
0a51b27e | 319 | |
e229f844 | 320 | lockdep_assert_held(&local->mtx); |
5bc75728 | 321 | |
6d3560d4 JB |
322 | /* |
323 | * It's ok to abort a not-yet-running scan (that | |
324 | * we have one at all will be verified by checking | |
325 | * local->scan_req next), but not to complete it | |
326 | * successfully. | |
327 | */ | |
328 | if (WARN_ON(!local->scanning && !aborted)) | |
329 | aborted = true; | |
5bc75728 | 330 | |
e229f844 | 331 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 332 | return; |
de95a54b | 333 | |
c56ef672 | 334 | if (hw_scan && !aborted && |
30686bf7 | 335 | !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && |
c56ef672 | 336 | ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
337 | int rc; |
338 | ||
339 | rc = drv_hw_scan(local, | |
340 | rcu_dereference_protected(local->scan_sdata, | |
341 | lockdep_is_held(&local->mtx)), | |
342 | local->hw_scan_req); | |
343 | ||
6eb11a9a | 344 | if (rc == 0) |
d07bfd8b | 345 | return; |
4d36ec58 JB |
346 | } |
347 | ||
348 | kfree(local->hw_scan_req); | |
349 | local->hw_scan_req = NULL; | |
f3b85252 | 350 | |
6ea0a69c JB |
351 | scan_req = rcu_dereference_protected(local->scan_req, |
352 | lockdep_is_held(&local->mtx)); | |
353 | ||
354 | if (scan_req != local->int_scan_req) | |
355 | cfg80211_scan_done(scan_req, aborted); | |
356 | RCU_INIT_POINTER(local->scan_req, NULL); | |
a344d677 JB |
357 | |
358 | scan_sdata = rcu_dereference_protected(local->scan_sdata, | |
359 | lockdep_is_held(&local->mtx)); | |
0c2bef46 | 360 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
2a519311 | 361 | |
fbe9c429 | 362 | local->scanning = 0; |
7ca15a0a | 363 | local->scan_chandef.chan = NULL; |
f3b85252 | 364 | |
07ef03ee JB |
365 | /* Set power back to normal operating levels. */ |
366 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 367 | |
8bd2a248 | 368 | if (!hw_scan) { |
e229f844 | 369 | ieee80211_configure_filter(local); |
a344d677 | 370 | drv_sw_scan_complete(local, scan_sdata); |
aacde9ee | 371 | ieee80211_offchannel_return(local); |
e229f844 | 372 | } |
0a51b27e | 373 | |
5cff20e6 | 374 | ieee80211_recalc_idle(local); |
e229f844 | 375 | |
0a51b27e | 376 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 377 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 378 | ieee80211_mesh_notify_scan_completed(local); |
a2b70e83 EP |
379 | if (was_scanning) |
380 | ieee80211_start_next_roc(local); | |
0a51b27e | 381 | } |
8789d459 JB |
382 | |
383 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
384 | { | |
385 | struct ieee80211_local *local = hw_to_local(hw); | |
386 | ||
387 | trace_api_scan_completed(local, aborted); | |
388 | ||
389 | set_bit(SCAN_COMPLETED, &local->scanning); | |
390 | if (aborted) | |
391 | set_bit(SCAN_ABORTED, &local->scanning); | |
392 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
393 | } | |
0a51b27e JB |
394 | EXPORT_SYMBOL(ieee80211_scan_completed); |
395 | ||
a344d677 JB |
396 | static int ieee80211_start_sw_scan(struct ieee80211_local *local, |
397 | struct ieee80211_sub_if_data *sdata) | |
f3b85252 | 398 | { |
fe57d9f5 JB |
399 | /* Software scan is not supported in multi-channel cases */ |
400 | if (local->use_chanctx) | |
401 | return -EOPNOTSUPP; | |
402 | ||
f3b85252 JB |
403 | /* |
404 | * Hardware/driver doesn't support hw_scan, so use software | |
405 | * scanning instead. First send a nullfunc frame with power save | |
406 | * bit on so that AP will buffer the frames for us while we are not | |
407 | * listening, then send probe requests to each channel and wait for | |
408 | * the responses. After all channels are scanned, tune back to the | |
409 | * original channel and send a nullfunc frame with power save bit | |
410 | * off to trigger the AP to send us all the buffered frames. | |
411 | * | |
412 | * Note that while local->sw_scanning is true everything else but | |
413 | * nullfunc frames and probe requests will be dropped in | |
414 | * ieee80211_tx_h_check_assoc(). | |
415 | */ | |
a344d677 | 416 | drv_sw_scan_start(local, sdata, local->scan_addr); |
f3b85252 | 417 | |
de312db3 | 418 | local->leave_oper_channel_time = jiffies; |
977923b0 | 419 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
420 | local->scan_channel_idx = 0; |
421 | ||
aacde9ee | 422 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 423 | |
9c35d7d2 | 424 | /* ensure nullfunc is transmitted before leaving operating channel */ |
3b24f4c6 | 425 | ieee80211_flush_queues(local, NULL, false); |
9c35d7d2 | 426 | |
3ac64bee | 427 | ieee80211_configure_filter(local); |
f3b85252 | 428 | |
59bdf3b0 BG |
429 | /* We need to set power level at maximum rate for scanning. */ |
430 | ieee80211_hw_config(local, 0); | |
431 | ||
42935eca | 432 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 433 | &local->scan_work, 0); |
f3b85252 JB |
434 | |
435 | return 0; | |
436 | } | |
437 | ||
133d40f9 SG |
438 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
439 | struct ieee80211_sub_if_data *sdata) | |
440 | { | |
5cbc95a7 | 441 | if (ieee80211_is_radar_required(local)) |
164eb02d SW |
442 | return false; |
443 | ||
2eb278e0 | 444 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
445 | return false; |
446 | ||
447 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
392b9ffb | 448 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
133d40f9 SG |
449 | return false; |
450 | ||
451 | return true; | |
452 | } | |
453 | ||
454 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
455 | { | |
456 | lockdep_assert_held(&local->mtx); | |
457 | ||
458 | if (!local->scan_req || local->scanning) | |
459 | return; | |
460 | ||
e2fd5dbc JB |
461 | if (!ieee80211_can_scan(local, |
462 | rcu_dereference_protected( | |
463 | local->scan_sdata, | |
464 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
465 | return; |
466 | ||
467 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
468 | round_jiffies_relative(0)); | |
469 | } | |
f3b85252 | 470 | |
8a690674 BG |
471 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
472 | unsigned long *next_delay) | |
473 | { | |
474 | int i; | |
e2fd5dbc | 475 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 476 | struct cfg80211_scan_request *scan_req; |
675a0b04 | 477 | enum ieee80211_band band = local->hw.conf.chandef.chan->band; |
6c17b77b SF |
478 | u32 tx_flags; |
479 | ||
6ea0a69c JB |
480 | scan_req = rcu_dereference_protected(local->scan_req, |
481 | lockdep_is_held(&local->mtx)); | |
482 | ||
6c17b77b | 483 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
6ea0a69c | 484 | if (scan_req->no_cck) |
6c17b77b | 485 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
8a690674 | 486 | |
e2fd5dbc | 487 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 488 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 489 | |
6ea0a69c | 490 | for (i = 0; i < scan_req->n_ssids; i++) |
8a690674 | 491 | ieee80211_send_probe_req( |
a344d677 | 492 | sdata, local->scan_addr, NULL, |
6ea0a69c JB |
493 | scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, |
494 | scan_req->ie, scan_req->ie_len, | |
495 | scan_req->rates[band], false, | |
675a0b04 | 496 | tx_flags, local->hw.conf.chandef.chan, true); |
8a690674 BG |
497 | |
498 | /* | |
499 | * After sending probe requests, wait for probe responses | |
500 | * on the channel. | |
501 | */ | |
502 | *next_delay = IEEE80211_CHANNEL_TIME; | |
503 | local->next_scan_state = SCAN_DECISION; | |
504 | } | |
505 | ||
f3b85252 JB |
506 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
507 | struct cfg80211_scan_request *req) | |
508 | { | |
509 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
510 | int rc; |
511 | ||
e229f844 SG |
512 | lockdep_assert_held(&local->mtx); |
513 | ||
2726f23d | 514 | if (local->scan_req || ieee80211_is_radar_required(local)) |
f3b85252 JB |
515 | return -EBUSY; |
516 | ||
133d40f9 | 517 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 518 | /* wait for the work to finish/time out */ |
6ea0a69c | 519 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 520 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
521 | return 0; |
522 | } | |
523 | ||
f3b85252 JB |
524 | if (local->ops->hw_scan) { |
525 | u8 *ies; | |
f3b85252 | 526 | |
e4dcbb37 | 527 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
c56ef672 | 528 | |
30686bf7 | 529 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
c56ef672 DS |
530 | int i, n_bands = 0; |
531 | u8 bands_counted = 0; | |
532 | ||
533 | for (i = 0; i < req->n_channels; i++) { | |
534 | if (bands_counted & BIT(req->channels[i]->band)) | |
535 | continue; | |
536 | bands_counted |= BIT(req->channels[i]->band); | |
537 | n_bands++; | |
538 | } | |
539 | ||
540 | local->hw_scan_ies_bufsize *= n_bands; | |
541 | } | |
542 | ||
4d36ec58 JB |
543 | local->hw_scan_req = kmalloc( |
544 | sizeof(*local->hw_scan_req) + | |
545 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 546 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 547 | if (!local->hw_scan_req) |
f3b85252 JB |
548 | return -ENOMEM; |
549 | ||
c56ef672 DS |
550 | local->hw_scan_req->req.ssids = req->ssids; |
551 | local->hw_scan_req->req.n_ssids = req->n_ssids; | |
4d36ec58 JB |
552 | ies = (u8 *)local->hw_scan_req + |
553 | sizeof(*local->hw_scan_req) + | |
554 | req->n_channels * sizeof(req->channels[0]); | |
c56ef672 DS |
555 | local->hw_scan_req->req.ie = ies; |
556 | local->hw_scan_req->req.flags = req->flags; | |
4d36ec58 JB |
557 | |
558 | local->hw_scan_band = 0; | |
6e7e6213 JL |
559 | |
560 | /* | |
561 | * After allocating local->hw_scan_req, we must | |
562 | * go through until ieee80211_prep_hw_scan(), so | |
563 | * anything that might be changed here and leave | |
564 | * this function early must not go after this | |
565 | * allocation. | |
566 | */ | |
f3b85252 JB |
567 | } |
568 | ||
6ea0a69c | 569 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 570 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 571 | |
a344d677 JB |
572 | if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
573 | get_random_mask_addr(local->scan_addr, | |
574 | req->mac_addr, | |
575 | req->mac_addr_mask); | |
576 | else | |
577 | memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); | |
578 | ||
8a690674 | 579 | if (local->ops->hw_scan) { |
fbe9c429 | 580 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 581 | } else if ((req->n_channels == 1) && |
675a0b04 | 582 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
583 | /* |
584 | * If we are scanning only on the operating channel | |
585 | * then we do not need to stop normal activities | |
8a690674 BG |
586 | */ |
587 | unsigned long next_delay; | |
588 | ||
589 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
590 | ||
591 | ieee80211_recalc_idle(local); | |
592 | ||
593 | /* Notify driver scan is starting, keep order of operations | |
594 | * same as normal software scan, in case that matters. */ | |
a344d677 | 595 | drv_sw_scan_start(local, sdata, local->scan_addr); |
8a690674 BG |
596 | |
597 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
598 | ||
599 | /* We need to ensure power level is at max for scanning. */ | |
600 | ieee80211_hw_config(local, 0); | |
601 | ||
602 | if ((req->channels[0]->flags & | |
8fe02e16 | 603 | IEEE80211_CHAN_NO_IR) || |
6ea0a69c | 604 | !req->n_ssids) { |
8a690674 BG |
605 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
606 | } else { | |
607 | ieee80211_scan_state_send_probe(local, &next_delay); | |
608 | next_delay = IEEE80211_CHANNEL_TIME; | |
609 | } | |
610 | ||
611 | /* Now, just wait a bit and we are all done! */ | |
612 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
613 | next_delay); | |
614 | return 0; | |
615 | } else { | |
616 | /* Do normal software scan */ | |
fbe9c429 | 617 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 618 | } |
6e7e6213 | 619 | |
5cff20e6 | 620 | ieee80211_recalc_idle(local); |
f3b85252 | 621 | |
4d36ec58 JB |
622 | if (local->ops->hw_scan) { |
623 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 624 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
a344d677 JB |
625 | } else { |
626 | rc = ieee80211_start_sw_scan(local, sdata); | |
627 | } | |
f3b85252 | 628 | |
f3b85252 | 629 | if (rc) { |
4d36ec58 JB |
630 | kfree(local->hw_scan_req); |
631 | local->hw_scan_req = NULL; | |
fbe9c429 | 632 | local->scanning = 0; |
f3b85252 | 633 | |
5cff20e6 JB |
634 | ieee80211_recalc_idle(local); |
635 | ||
f3b85252 | 636 | local->scan_req = NULL; |
0c2bef46 | 637 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 JB |
638 | } |
639 | ||
640 | return rc; | |
641 | } | |
642 | ||
df13cce5 HS |
643 | static unsigned long |
644 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
645 | { | |
646 | /* | |
647 | * TODO: channel switching also consumes quite some time, | |
648 | * add that delay as well to get a better estimation | |
649 | */ | |
8fe02e16 | 650 | if (chan->flags & IEEE80211_CHAN_NO_IR) |
df13cce5 HS |
651 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
652 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
653 | } | |
654 | ||
e229f844 SG |
655 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
656 | unsigned long *next_delay) | |
7d3be3cc | 657 | { |
142b9f50 | 658 | bool associated = false; |
df13cce5 HS |
659 | bool tx_empty = true; |
660 | bool bad_latency; | |
142b9f50 | 661 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 662 | struct ieee80211_channel *next_chan; |
cd2bb512 | 663 | enum mac80211_scan_state next_scan_state; |
6ea0a69c | 664 | struct cfg80211_scan_request *scan_req; |
142b9f50 | 665 | |
df13cce5 HS |
666 | /* |
667 | * check if at least one STA interface is associated, | |
668 | * check if at least one STA interface has pending tx frames | |
669 | * and grab the lowest used beacon interval | |
670 | */ | |
142b9f50 HS |
671 | mutex_lock(&local->iflist_mtx); |
672 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 673 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
674 | continue; |
675 | ||
676 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
677 | if (sdata->u.mgd.associated) { | |
678 | associated = true; | |
df13cce5 | 679 | |
df13cce5 HS |
680 | if (!qdisc_all_tx_empty(sdata->dev)) { |
681 | tx_empty = false; | |
682 | break; | |
683 | } | |
142b9f50 HS |
684 | } |
685 | } | |
686 | } | |
687 | mutex_unlock(&local->iflist_mtx); | |
688 | ||
6ea0a69c JB |
689 | scan_req = rcu_dereference_protected(local->scan_req, |
690 | lockdep_is_held(&local->mtx)); | |
691 | ||
692 | next_chan = scan_req->channels[local->scan_channel_idx]; | |
b23b025f | 693 | |
a80f7c0b | 694 | /* |
07ef03ee JB |
695 | * we're currently scanning a different channel, let's |
696 | * see if we can scan another channel without interfering | |
697 | * with the current traffic situation. | |
698 | * | |
3f892b61 | 699 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 700 | */ |
a80f7c0b | 701 | |
07ef03ee | 702 | bad_latency = time_after(jiffies + |
3f892b61 SG |
703 | ieee80211_scan_get_channel_time(next_chan), |
704 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 705 | |
cd2bb512 | 706 | if (associated && !tx_empty) { |
6ea0a69c | 707 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
cd2bb512 SL |
708 | next_scan_state = SCAN_ABORT; |
709 | else | |
710 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 711 | } else if (associated && bad_latency) { |
cd2bb512 SL |
712 | next_scan_state = SCAN_SUSPEND; |
713 | } else { | |
714 | next_scan_state = SCAN_SET_CHANNEL; | |
715 | } | |
716 | ||
717 | local->next_scan_state = next_scan_state; | |
142b9f50 | 718 | |
07ef03ee | 719 | *next_delay = 0; |
142b9f50 HS |
720 | } |
721 | ||
2fb3f028 HS |
722 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
723 | unsigned long *next_delay) | |
724 | { | |
725 | int skip; | |
726 | struct ieee80211_channel *chan; | |
7ca15a0a | 727 | enum nl80211_bss_scan_width oper_scan_width; |
6ea0a69c JB |
728 | struct cfg80211_scan_request *scan_req; |
729 | ||
730 | scan_req = rcu_dereference_protected(local->scan_req, | |
731 | lockdep_is_held(&local->mtx)); | |
2fb3f028 | 732 | |
7d3be3cc | 733 | skip = 0; |
6ea0a69c | 734 | chan = scan_req->channels[local->scan_channel_idx]; |
7d3be3cc | 735 | |
7ca15a0a SW |
736 | local->scan_chandef.chan = chan; |
737 | local->scan_chandef.center_freq1 = chan->center_freq; | |
738 | local->scan_chandef.center_freq2 = 0; | |
6ea0a69c | 739 | switch (scan_req->scan_width) { |
7ca15a0a SW |
740 | case NL80211_BSS_CHAN_WIDTH_5: |
741 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; | |
742 | break; | |
743 | case NL80211_BSS_CHAN_WIDTH_10: | |
744 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; | |
745 | break; | |
746 | case NL80211_BSS_CHAN_WIDTH_20: | |
747 | /* If scanning on oper channel, use whatever channel-type | |
748 | * is currently in use. | |
749 | */ | |
750 | oper_scan_width = cfg80211_chandef_to_scan_width( | |
751 | &local->_oper_chandef); | |
752 | if (chan == local->_oper_chandef.chan && | |
6ea0a69c | 753 | oper_scan_width == scan_req->scan_width) |
7ca15a0a SW |
754 | local->scan_chandef = local->_oper_chandef; |
755 | else | |
756 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; | |
757 | break; | |
758 | } | |
b23b025f | 759 | |
07ef03ee JB |
760 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
761 | skip = 1; | |
7d3be3cc | 762 | |
7d3be3cc HS |
763 | /* advance state machine to next channel/band */ |
764 | local->scan_channel_idx++; | |
765 | ||
0ee9c13c HS |
766 | if (skip) { |
767 | /* if we skip this channel return to the decision state */ | |
768 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 769 | return; |
0ee9c13c | 770 | } |
7d3be3cc HS |
771 | |
772 | /* | |
773 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
774 | * (which unfortunately doesn't say _why_ step a) is done, | |
775 | * but it waits for the probe delay or until a frame is | |
776 | * received - and the received frame would update the NAV). | |
777 | * For now, we do not support waiting until a frame is | |
778 | * received. | |
779 | * | |
780 | * In any case, it is not necessary for a passive scan. | |
781 | */ | |
6ea0a69c | 782 | if (chan->flags & IEEE80211_CHAN_NO_IR || !scan_req->n_ssids) { |
7d3be3cc | 783 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
977923b0 | 784 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 785 | return; |
7d3be3cc HS |
786 | } |
787 | ||
2fb3f028 | 788 | /* active scan, send probes */ |
7d3be3cc | 789 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 790 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
791 | } |
792 | ||
07ef03ee JB |
793 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
794 | unsigned long *next_delay) | |
795 | { | |
796 | /* switch back to the operating channel */ | |
7ca15a0a | 797 | local->scan_chandef.chan = NULL; |
07ef03ee JB |
798 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
799 | ||
aacde9ee SG |
800 | /* disable PS */ |
801 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
802 | |
803 | *next_delay = HZ / 5; | |
804 | /* afterwards, resume scan & go to next channel */ | |
805 | local->next_scan_state = SCAN_RESUME; | |
806 | } | |
807 | ||
808 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
809 | unsigned long *next_delay) | |
810 | { | |
aacde9ee | 811 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
812 | |
813 | if (local->ops->flush) { | |
3b24f4c6 | 814 | ieee80211_flush_queues(local, NULL, false); |
07ef03ee JB |
815 | *next_delay = 0; |
816 | } else | |
817 | *next_delay = HZ / 10; | |
818 | ||
819 | /* remember when we left the operating channel */ | |
820 | local->leave_oper_channel_time = jiffies; | |
821 | ||
822 | /* advance to the next channel to be scanned */ | |
de2ee84d | 823 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
824 | } |
825 | ||
c2b13452 | 826 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
827 | { |
828 | struct ieee80211_local *local = | |
829 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 830 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 831 | struct cfg80211_scan_request *scan_req; |
0a51b27e | 832 | unsigned long next_delay = 0; |
8bd2a248 | 833 | bool aborted; |
0a51b27e | 834 | |
259b62e3 | 835 | mutex_lock(&local->mtx); |
8789d459 | 836 | |
332ff7fe LC |
837 | if (!ieee80211_can_run_worker(local)) { |
838 | aborted = true; | |
839 | goto out_complete; | |
840 | } | |
841 | ||
e2fd5dbc JB |
842 | sdata = rcu_dereference_protected(local->scan_sdata, |
843 | lockdep_is_held(&local->mtx)); | |
6ea0a69c JB |
844 | scan_req = rcu_dereference_protected(local->scan_req, |
845 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 846 | |
8a690674 BG |
847 | /* When scanning on-channel, the first-callback means completed. */ |
848 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
849 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
850 | goto out_complete; | |
851 | } | |
852 | ||
259b62e3 | 853 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 854 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 855 | goto out_complete; |
8789d459 JB |
856 | } |
857 | ||
6ea0a69c | 858 | if (!sdata || !scan_req) |
259b62e3 | 859 | goto out; |
f3b85252 | 860 | |
ff5db439 | 861 | if (!local->scanning) { |
f3b85252 JB |
862 | int rc; |
863 | ||
6ea0a69c | 864 | RCU_INIT_POINTER(local->scan_req, NULL); |
0c2bef46 | 865 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 | 866 | |
6ea0a69c | 867 | rc = __ieee80211_start_scan(sdata, scan_req); |
259b62e3 | 868 | if (rc) { |
3aed49ef | 869 | /* need to complete scan in cfg80211 */ |
6ea0a69c | 870 | rcu_assign_pointer(local->scan_req, scan_req); |
259b62e3 SG |
871 | aborted = true; |
872 | goto out_complete; | |
873 | } else | |
874 | goto out; | |
f3b85252 JB |
875 | } |
876 | ||
f502d09b HS |
877 | /* |
878 | * as long as no delay is required advance immediately | |
879 | * without scheduling a new work | |
880 | */ | |
881 | do { | |
c29acf20 RM |
882 | if (!ieee80211_sdata_running(sdata)) { |
883 | aborted = true; | |
884 | goto out_complete; | |
885 | } | |
886 | ||
977923b0 | 887 | switch (local->next_scan_state) { |
2fb3f028 | 888 | case SCAN_DECISION: |
e229f844 | 889 | /* if no more bands/channels left, complete scan */ |
6ea0a69c | 890 | if (local->scan_channel_idx >= scan_req->n_channels) { |
e229f844 SG |
891 | aborted = false; |
892 | goto out_complete; | |
893 | } | |
894 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 895 | break; |
2fb3f028 HS |
896 | case SCAN_SET_CHANNEL: |
897 | ieee80211_scan_state_set_channel(local, &next_delay); | |
898 | break; | |
f502d09b HS |
899 | case SCAN_SEND_PROBE: |
900 | ieee80211_scan_state_send_probe(local, &next_delay); | |
901 | break; | |
07ef03ee JB |
902 | case SCAN_SUSPEND: |
903 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 904 | break; |
07ef03ee JB |
905 | case SCAN_RESUME: |
906 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 907 | break; |
cd2bb512 SL |
908 | case SCAN_ABORT: |
909 | aborted = true; | |
910 | goto out_complete; | |
f502d09b HS |
911 | } |
912 | } while (next_delay == 0); | |
0a51b27e | 913 | |
42935eca | 914 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 915 | goto out; |
259b62e3 SG |
916 | |
917 | out_complete: | |
8bd2a248 | 918 | __ieee80211_scan_completed(&local->hw, aborted); |
259b62e3 SG |
919 | out: |
920 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
921 | } |
922 | ||
f3b85252 JB |
923 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
924 | struct cfg80211_scan_request *req) | |
0a51b27e | 925 | { |
f3b85252 | 926 | int res; |
de95a54b | 927 | |
a1699b75 | 928 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 929 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 930 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 931 | |
f3b85252 | 932 | return res; |
0a51b27e JB |
933 | } |
934 | ||
34bcf715 SG |
935 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
936 | const u8 *ssid, u8 ssid_len, | |
76bed0f4 JD |
937 | struct ieee80211_channel **channels, |
938 | unsigned int n_channels, | |
7ca15a0a | 939 | enum nl80211_bss_scan_width scan_width) |
0a51b27e | 940 | { |
0a51b27e | 941 | struct ieee80211_local *local = sdata->local; |
76bed0f4 | 942 | int ret = -EBUSY, i, n_ch = 0; |
fb63bc41 | 943 | enum ieee80211_band band; |
2a519311 | 944 | |
a1699b75 | 945 | mutex_lock(&local->mtx); |
0a51b27e | 946 | |
f3b85252 JB |
947 | /* busy scanning */ |
948 | if (local->scan_req) | |
949 | goto unlock; | |
9116dd01 | 950 | |
be4a4b6a | 951 | /* fill internal scan request */ |
76bed0f4 JD |
952 | if (!channels) { |
953 | int max_n; | |
be4a4b6a JB |
954 | |
955 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
956 | if (!local->hw.wiphy->bands[band]) | |
957 | continue; | |
34bcf715 SG |
958 | |
959 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
960 | for (i = 0; i < max_n; i++) { | |
961 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 962 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 | 963 | |
8fe02e16 | 964 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
965 | IEEE80211_CHAN_DISABLED)) |
966 | continue; | |
967 | ||
968 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
969 | n_ch++; | |
be4a4b6a JB |
970 | } |
971 | } | |
972 | ||
34bcf715 SG |
973 | if (WARN_ON_ONCE(n_ch == 0)) |
974 | goto unlock; | |
975 | ||
976 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 977 | } else { |
76bed0f4 JD |
978 | for (i = 0; i < n_channels; i++) { |
979 | if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | | |
980 | IEEE80211_CHAN_DISABLED)) | |
981 | continue; | |
982 | ||
983 | local->int_scan_req->channels[n_ch] = channels[i]; | |
984 | n_ch++; | |
985 | } | |
986 | ||
987 | if (WARN_ON_ONCE(n_ch == 0)) | |
34bcf715 SG |
988 | goto unlock; |
989 | ||
76bed0f4 | 990 | local->int_scan_req->n_channels = n_ch; |
be4a4b6a JB |
991 | } |
992 | ||
993 | local->int_scan_req->ssids = &local->scan_ssid; | |
994 | local->int_scan_req->n_ssids = 1; | |
7ca15a0a | 995 | local->int_scan_req->scan_width = scan_width; |
5ba63533 JB |
996 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
997 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 998 | |
5ba63533 | 999 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 1000 | unlock: |
a1699b75 | 1001 | mutex_unlock(&local->mtx); |
f3b85252 | 1002 | return ret; |
0a51b27e | 1003 | } |
5bb644a0 | 1004 | |
4136c422 SG |
1005 | /* |
1006 | * Only call this function when a scan can't be queued -- under RTNL. | |
1007 | */ | |
5bb644a0 JB |
1008 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
1009 | { | |
5bb644a0 | 1010 | /* |
b856439b | 1011 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
1012 | * yet really started (see __ieee80211_start_scan ). |
1013 | * | |
1014 | * Regarding hardware scan: | |
1015 | * - we can not call __ieee80211_scan_completed() as when | |
1016 | * SCAN_HW_SCANNING bit is set this function change | |
1017 | * local->hw_scan_req to operate on 5G band, what race with | |
1018 | * driver which can use local->hw_scan_req | |
1019 | * | |
1020 | * - we can not cancel scan_work since driver can schedule it | |
1021 | * by ieee80211_scan_completed(..., true) to finish scan | |
1022 | * | |
b856439b EP |
1023 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
1024 | * driver is still responsible for calling ieee80211_scan_completed() | |
1025 | * after the scan was completed/aborted. | |
5bb644a0 | 1026 | */ |
4136c422 | 1027 | |
a1699b75 | 1028 | mutex_lock(&local->mtx); |
b856439b EP |
1029 | if (!local->scan_req) |
1030 | goto out; | |
1031 | ||
a754055a EG |
1032 | /* |
1033 | * We have a scan running and the driver already reported completion, | |
1034 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
1035 | * cancelled. | |
1036 | */ | |
1037 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
1038 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
1039 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
1040 | goto out; | |
1041 | } | |
1042 | ||
b856439b | 1043 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
a754055a EG |
1044 | /* |
1045 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
1046 | * scan on another band. | |
1047 | */ | |
1048 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 1049 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
1050 | drv_cancel_hw_scan(local, |
1051 | rcu_dereference_protected(local->scan_sdata, | |
1052 | lockdep_is_held(&local->mtx))); | |
b856439b | 1053 | goto out; |
4136c422 | 1054 | } |
b856439b EP |
1055 | |
1056 | /* | |
1057 | * If the work is currently running, it must be blocked on | |
1058 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
1059 | * simply exit once it acquires the mutex. | |
1060 | */ | |
1061 | cancel_delayed_work(&local->scan_work); | |
1062 | /* and clean up */ | |
8bd2a248 | 1063 | __ieee80211_scan_completed(&local->hw, true); |
b856439b | 1064 | out: |
d07bfd8b | 1065 | mutex_unlock(&local->mtx); |
5bb644a0 | 1066 | } |
79f460ca | 1067 | |
d43c6b6e DS |
1068 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1069 | struct cfg80211_sched_scan_request *req) | |
79f460ca LC |
1070 | { |
1071 | struct ieee80211_local *local = sdata->local; | |
633e2713 | 1072 | struct ieee80211_scan_ies sched_scan_ies = {}; |
2103dec1 | 1073 | struct cfg80211_chan_def chandef; |
633e2713 DS |
1074 | int ret, i, iebufsz, num_bands = 0; |
1075 | u32 rate_masks[IEEE80211_NUM_BANDS] = {}; | |
1076 | u8 bands_used = 0; | |
1077 | u8 *ie; | |
1078 | size_t len; | |
c604b9f2 | 1079 | |
e4dcbb37 | 1080 | iebufsz = local->scan_ies_len + req->ie_len; |
79f460ca | 1081 | |
d43c6b6e | 1082 | lockdep_assert_held(&local->mtx); |
79f460ca | 1083 | |
d43c6b6e DS |
1084 | if (!local->ops->sched_scan_start) |
1085 | return -ENOTSUPP; | |
79f460ca LC |
1086 | |
1087 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
633e2713 DS |
1088 | if (local->hw.wiphy->bands[i]) { |
1089 | bands_used |= BIT(i); | |
1090 | rate_masks[i] = (u32) -1; | |
1091 | num_bands++; | |
79f460ca | 1092 | } |
633e2713 | 1093 | } |
79f460ca | 1094 | |
633e2713 DS |
1095 | ie = kzalloc(num_bands * iebufsz, GFP_KERNEL); |
1096 | if (!ie) { | |
1097 | ret = -ENOMEM; | |
1098 | goto out; | |
79f460ca LC |
1099 | } |
1100 | ||
633e2713 DS |
1101 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
1102 | ||
1103 | len = ieee80211_build_preq_ies(local, ie, num_bands * iebufsz, | |
1104 | &sched_scan_ies, req->ie, | |
1105 | req->ie_len, bands_used, | |
1106 | rate_masks, &chandef); | |
1107 | ||
30dd3edf | 1108 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
d43c6b6e | 1109 | if (ret == 0) { |
5260a5b2 | 1110 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
6ea0a69c | 1111 | rcu_assign_pointer(local->sched_scan_req, req); |
d43c6b6e | 1112 | } |
79f460ca | 1113 | |
633e2713 | 1114 | kfree(ie); |
d43c6b6e | 1115 | |
633e2713 | 1116 | out: |
d43c6b6e DS |
1117 | if (ret) { |
1118 | /* Clean in case of failure after HW restart or upon resume. */ | |
0c2bef46 | 1119 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
6ea0a69c | 1120 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e DS |
1121 | } |
1122 | ||
1123 | return ret; | |
1124 | } | |
1125 | ||
1126 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
1127 | struct cfg80211_sched_scan_request *req) | |
1128 | { | |
1129 | struct ieee80211_local *local = sdata->local; | |
1130 | int ret; | |
1131 | ||
1132 | mutex_lock(&local->mtx); | |
1133 | ||
1134 | if (rcu_access_pointer(local->sched_scan_sdata)) { | |
1135 | mutex_unlock(&local->mtx); | |
1136 | return -EBUSY; | |
1137 | } | |
1138 | ||
1139 | ret = __ieee80211_request_sched_scan_start(sdata, req); | |
1140 | ||
5260a5b2 | 1141 | mutex_unlock(&local->mtx); |
79f460ca LC |
1142 | return ret; |
1143 | } | |
1144 | ||
85a9994a | 1145 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) |
79f460ca LC |
1146 | { |
1147 | struct ieee80211_local *local = sdata->local; | |
30dd3edf | 1148 | int ret = 0; |
79f460ca | 1149 | |
5260a5b2 | 1150 | mutex_lock(&local->mtx); |
79f460ca LC |
1151 | |
1152 | if (!local->ops->sched_scan_stop) { | |
1153 | ret = -ENOTSUPP; | |
1154 | goto out; | |
1155 | } | |
1156 | ||
d43c6b6e | 1157 | /* We don't want to restart sched scan anymore. */ |
6ea0a69c | 1158 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1159 | |
71228a1e | 1160 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
37e3308c | 1161 | ret = drv_sched_scan_stop(local, sdata); |
71228a1e | 1162 | if (!ret) |
ad053a96 | 1163 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
71228a1e | 1164 | } |
79f460ca | 1165 | out: |
5260a5b2 | 1166 | mutex_unlock(&local->mtx); |
79f460ca LC |
1167 | |
1168 | return ret; | |
1169 | } | |
1170 | ||
1171 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1172 | { | |
1173 | struct ieee80211_local *local = hw_to_local(hw); | |
1174 | ||
1175 | trace_api_sched_scan_results(local); | |
1176 | ||
1177 | cfg80211_sched_scan_results(hw->wiphy); | |
1178 | } | |
1179 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1180 | ||
f6837ba8 | 1181 | void ieee80211_sched_scan_end(struct ieee80211_local *local) |
85a9994a | 1182 | { |
85a9994a LC |
1183 | mutex_lock(&local->mtx); |
1184 | ||
5260a5b2 | 1185 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1186 | mutex_unlock(&local->mtx); |
1187 | return; | |
1188 | } | |
1189 | ||
0c2bef46 | 1190 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
85a9994a | 1191 | |
d43c6b6e | 1192 | /* If sched scan was aborted by the driver. */ |
6ea0a69c | 1193 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1194 | |
85a9994a LC |
1195 | mutex_unlock(&local->mtx); |
1196 | ||
1197 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
1198 | } | |
1199 | ||
f6837ba8 JB |
1200 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1201 | { | |
1202 | struct ieee80211_local *local = | |
1203 | container_of(work, struct ieee80211_local, | |
1204 | sched_scan_stopped_work); | |
1205 | ||
1206 | ieee80211_sched_scan_end(local); | |
1207 | } | |
1208 | ||
79f460ca LC |
1209 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1210 | { | |
1211 | struct ieee80211_local *local = hw_to_local(hw); | |
1212 | ||
1213 | trace_api_sched_scan_stopped(local); | |
1214 | ||
18db594a | 1215 | schedule_work(&local->sched_scan_stopped_work); |
79f460ca LC |
1216 | } |
1217 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |