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0a51b27e | 1 | /* |
5484e237 JB |
2 | * Scanning implementation |
3 | * | |
0a51b27e JB |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
5 | * Copyright 2004, Instant802 Networks, Inc. | |
6 | * Copyright 2005, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
74d803b6 | 9 | * Copyright 2013-2015 Intel Mobile Communications GmbH |
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> |
df13cce5 | 19 | #include <net/sch_generic.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
bc3b2d7f | 21 | #include <linux/export.h> |
0a51b27e | 22 | #include <net/mac80211.h> |
0a51b27e JB |
23 | |
24 | #include "ieee80211_i.h" | |
24487981 | 25 | #include "driver-ops.h" |
5484e237 | 26 | #include "mesh.h" |
0a51b27e JB |
27 | |
28 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
29 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
3f892b61 | 30 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) |
0a51b27e | 31 | |
5484e237 | 32 | void ieee80211_rx_bss_put(struct ieee80211_local *local, |
c2b13452 | 33 | struct ieee80211_bss *bss) |
5484e237 | 34 | { |
0c1ad2ca JB |
35 | if (!bss) |
36 | return; | |
5b112d3d JB |
37 | cfg80211_put_bss(local->hw.wiphy, |
38 | container_of((void *)bss, struct cfg80211_bss, priv)); | |
5484e237 JB |
39 | } |
40 | ||
ab13315a KV |
41 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
42 | { | |
43 | u8 qos_info; | |
44 | ||
45 | if (elems->wmm_info && elems->wmm_info_len == 7 | |
46 | && elems->wmm_info[5] == 1) | |
47 | qos_info = elems->wmm_info[6]; | |
48 | else if (elems->wmm_param && elems->wmm_param_len == 24 | |
49 | && elems->wmm_param[5] == 1) | |
50 | qos_info = elems->wmm_param[6]; | |
51 | else | |
52 | /* no valid wmm information or parameter element found */ | |
53 | return false; | |
54 | ||
55 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; | |
56 | } | |
57 | ||
c2b13452 | 58 | struct ieee80211_bss * |
5484e237 JB |
59 | ieee80211_bss_info_update(struct ieee80211_local *local, |
60 | struct ieee80211_rx_status *rx_status, | |
d45c4172 | 61 | struct ieee80211_mgmt *mgmt, size_t len, |
5484e237 | 62 | struct ieee802_11_elems *elems, |
d45c4172 | 63 | struct ieee80211_channel *channel) |
5484e237 | 64 | { |
d45c4172 | 65 | bool beacon = ieee80211_is_beacon(mgmt->frame_control); |
0c1ad2ca | 66 | struct cfg80211_bss *cbss; |
c2b13452 | 67 | struct ieee80211_bss *bss; |
f0b058b6 | 68 | int clen, srlen; |
61f6bba0 | 69 | struct cfg80211_inform_bss bss_meta = {}; |
74d803b6 | 70 | bool signal_valid; |
2a519311 | 71 | |
30686bf7 | 72 | if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) |
61f6bba0 | 73 | bss_meta.signal = rx_status->signal * 100; |
30686bf7 | 74 | else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) |
61f6bba0 | 75 | bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 76 | |
61f6bba0 | 77 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20; |
7ca15a0a | 78 | if (rx_status->flag & RX_FLAG_5MHZ) |
61f6bba0 | 79 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5; |
7ca15a0a | 80 | if (rx_status->flag & RX_FLAG_10MHZ) |
61f6bba0 | 81 | bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10; |
7ca15a0a | 82 | |
61f6bba0 JB |
83 | bss_meta.chan = channel; |
84 | cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, | |
85 | mgmt, len, GFP_ATOMIC); | |
0c1ad2ca | 86 | if (!cbss) |
00d3f14c | 87 | return NULL; |
74d803b6 SS |
88 | /* In case the signal is invalid update the status */ |
89 | signal_valid = abs(channel->center_freq - cbss->channel->center_freq) | |
90 | <= local->hw.wiphy->max_adj_channel_rssi_comp; | |
91 | if (!signal_valid) | |
92 | rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; | |
00d3f14c | 93 | |
0c1ad2ca | 94 | bss = (void *)cbss->priv; |
5484e237 | 95 | |
ef429dad JB |
96 | if (beacon) |
97 | bss->device_ts_beacon = rx_status->device_timestamp; | |
98 | else | |
99 | bss->device_ts_presp = rx_status->device_timestamp; | |
8c358bcd | 100 | |
fcff4f10 PS |
101 | if (elems->parse_error) { |
102 | if (beacon) | |
103 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
104 | else | |
105 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
106 | } else { | |
107 | if (beacon) | |
108 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
109 | else | |
110 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
111 | } | |
112 | ||
5484e237 | 113 | /* save the ERP value so that it is available at association time */ |
1946bed9 JB |
114 | if (elems->erp_info && (!elems->parse_error || |
115 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 116 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 117 | bss->has_erp_value = true; |
fcff4f10 PS |
118 | if (!elems->parse_error) |
119 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
120 | } |
121 | ||
f0b058b6 | 122 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
123 | if (!elems->parse_error || |
124 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
125 | srlen = 0; | |
126 | if (elems->supp_rates) { | |
127 | clen = IEEE80211_MAX_SUPP_RATES; | |
128 | if (clen > elems->supp_rates_len) | |
129 | clen = elems->supp_rates_len; | |
130 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
131 | srlen += clen; | |
132 | } | |
133 | if (elems->ext_supp_rates) { | |
134 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
135 | if (clen > elems->ext_supp_rates_len) | |
136 | clen = elems->ext_supp_rates_len; | |
137 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
138 | clen); | |
139 | srlen += clen; | |
140 | } | |
141 | if (srlen) { | |
142 | bss->supp_rates_len = srlen; | |
143 | if (!elems->parse_error) | |
144 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
145 | } | |
5484e237 | 146 | } |
5484e237 | 147 | |
fcff4f10 PS |
148 | if (!elems->parse_error || |
149 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
150 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
151 | bss->uapsd_supported = is_uapsd_supported(elems); | |
152 | if (!elems->parse_error) | |
153 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
154 | } | |
5484e237 | 155 | |
817cee76 AB |
156 | if (beacon) { |
157 | struct ieee80211_supported_band *sband = | |
158 | local->hw.wiphy->bands[rx_status->band]; | |
159 | if (!(rx_status->flag & RX_FLAG_HT) && | |
160 | !(rx_status->flag & RX_FLAG_VHT)) | |
161 | bss->beacon_rate = | |
162 | &sband->bitrates[rx_status->rate_idx]; | |
163 | } | |
164 | ||
5484e237 JB |
165 | return bss; |
166 | } | |
0a51b27e | 167 | |
d48b2968 | 168 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 169 | { |
f1d58c25 | 170 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
171 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
172 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 173 | struct ieee80211_bss *bss; |
98c8fccf JB |
174 | u8 *elements; |
175 | struct ieee80211_channel *channel; | |
176 | size_t baselen; | |
98c8fccf JB |
177 | struct ieee802_11_elems elems; |
178 | ||
d48b2968 JB |
179 | if (skb->len < 24 || |
180 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
181 | !ieee80211_is_beacon(mgmt->frame_control))) | |
182 | return; | |
98c8fccf | 183 | |
d48b2968 JB |
184 | sdata1 = rcu_dereference(local->scan_sdata); |
185 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 186 | |
d48b2968 JB |
187 | if (likely(!sdata1 && !sdata2)) |
188 | return; | |
98c8fccf | 189 | |
d48b2968 | 190 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
a344d677 JB |
191 | struct cfg80211_scan_request *scan_req; |
192 | struct cfg80211_sched_scan_request *sched_scan_req; | |
193 | ||
194 | scan_req = rcu_dereference(local->scan_req); | |
195 | sched_scan_req = rcu_dereference(local->sched_scan_req); | |
196 | ||
197 | /* ignore ProbeResp to foreign address unless scanning | |
198 | * with randomised address | |
199 | */ | |
200 | if (!(sdata1 && | |
201 | (ether_addr_equal(mgmt->da, sdata1->vif.addr) || | |
202 | scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)) && | |
203 | !(sdata2 && | |
204 | (ether_addr_equal(mgmt->da, sdata2->vif.addr) || | |
205 | sched_scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR))) | |
d48b2968 | 206 | return; |
98c8fccf | 207 | |
98c8fccf JB |
208 | elements = mgmt->u.probe_resp.variable; |
209 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
210 | } else { | |
98c8fccf JB |
211 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
212 | elements = mgmt->u.beacon.variable; | |
213 | } | |
214 | ||
98c8fccf | 215 | if (baselen > skb->len) |
d48b2968 | 216 | return; |
98c8fccf | 217 | |
b2e506bf | 218 | ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); |
98c8fccf | 219 | |
0172bb75 | 220 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
221 | |
222 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 223 | return; |
98c8fccf | 224 | |
d48b2968 | 225 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 226 | mgmt, skb->len, &elems, |
d45c4172 | 227 | channel); |
d048e503 | 228 | if (bss) |
d48b2968 | 229 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
230 | } |
231 | ||
2103dec1 SW |
232 | static void |
233 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, | |
234 | enum nl80211_bss_scan_width scan_width) | |
235 | { | |
236 | memset(chandef, 0, sizeof(*chandef)); | |
237 | switch (scan_width) { | |
238 | case NL80211_BSS_CHAN_WIDTH_5: | |
239 | chandef->width = NL80211_CHAN_WIDTH_5; | |
240 | break; | |
241 | case NL80211_BSS_CHAN_WIDTH_10: | |
242 | chandef->width = NL80211_CHAN_WIDTH_10; | |
243 | break; | |
244 | default: | |
245 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
246 | break; | |
247 | } | |
248 | } | |
249 | ||
4d36ec58 JB |
250 | /* return false if no more work */ |
251 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
252 | { | |
6ea0a69c | 253 | struct cfg80211_scan_request *req; |
2103dec1 | 254 | struct cfg80211_chan_def chandef; |
c56ef672 | 255 | u8 bands_used = 0; |
4d36ec58 JB |
256 | int i, ielen, n_chans; |
257 | ||
6ea0a69c JB |
258 | req = rcu_dereference_protected(local->scan_req, |
259 | lockdep_is_held(&local->mtx)); | |
260 | ||
a754055a EG |
261 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
262 | return false; | |
263 | ||
30686bf7 | 264 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
4d36ec58 | 265 | for (i = 0; i < req->n_channels; i++) { |
c56ef672 DS |
266 | local->hw_scan_req->req.channels[i] = req->channels[i]; |
267 | bands_used |= BIT(req->channels[i]->band); | |
268 | } | |
269 | ||
270 | n_chans = req->n_channels; | |
271 | } else { | |
272 | do { | |
273 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
274 | return false; | |
275 | ||
276 | n_chans = 0; | |
277 | ||
278 | for (i = 0; i < req->n_channels; i++) { | |
279 | if (req->channels[i]->band != | |
280 | local->hw_scan_band) | |
281 | continue; | |
282 | local->hw_scan_req->req.channels[n_chans] = | |
4d36ec58 JB |
283 | req->channels[i]; |
284 | n_chans++; | |
c56ef672 | 285 | bands_used |= BIT(req->channels[i]->band); |
4d36ec58 | 286 | } |
4d36ec58 | 287 | |
c56ef672 DS |
288 | local->hw_scan_band++; |
289 | } while (!n_chans); | |
290 | } | |
4d36ec58 | 291 | |
c56ef672 | 292 | local->hw_scan_req->req.n_channels = n_chans; |
2103dec1 | 293 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
4d36ec58 | 294 | |
c56ef672 DS |
295 | ielen = ieee80211_build_preq_ies(local, |
296 | (u8 *)local->hw_scan_req->req.ie, | |
c604b9f2 | 297 | local->hw_scan_ies_bufsize, |
c56ef672 DS |
298 | &local->hw_scan_req->ies, |
299 | req->ie, req->ie_len, | |
300 | bands_used, req->rates, &chandef); | |
301 | local->hw_scan_req->req.ie_len = ielen; | |
302 | local->hw_scan_req->req.no_cck = req->no_cck; | |
a344d677 JB |
303 | ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); |
304 | ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, | |
305 | req->mac_addr_mask); | |
4d36ec58 JB |
306 | |
307 | return true; | |
308 | } | |
309 | ||
8bd2a248 | 310 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
311 | { |
312 | struct ieee80211_local *local = hw_to_local(hw); | |
8bd2a248 | 313 | bool hw_scan = local->ops->hw_scan; |
a2b70e83 | 314 | bool was_scanning = local->scanning; |
6ea0a69c | 315 | struct cfg80211_scan_request *scan_req; |
a344d677 | 316 | struct ieee80211_sub_if_data *scan_sdata; |
0a51b27e | 317 | |
e229f844 | 318 | lockdep_assert_held(&local->mtx); |
5bc75728 | 319 | |
6d3560d4 JB |
320 | /* |
321 | * It's ok to abort a not-yet-running scan (that | |
322 | * we have one at all will be verified by checking | |
323 | * local->scan_req next), but not to complete it | |
324 | * successfully. | |
325 | */ | |
326 | if (WARN_ON(!local->scanning && !aborted)) | |
327 | aborted = true; | |
5bc75728 | 328 | |
e229f844 | 329 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 330 | return; |
de95a54b | 331 | |
c56ef672 | 332 | if (hw_scan && !aborted && |
30686bf7 | 333 | !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && |
c56ef672 | 334 | ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
335 | int rc; |
336 | ||
337 | rc = drv_hw_scan(local, | |
338 | rcu_dereference_protected(local->scan_sdata, | |
339 | lockdep_is_held(&local->mtx)), | |
340 | local->hw_scan_req); | |
341 | ||
6eb11a9a | 342 | if (rc == 0) |
d07bfd8b | 343 | return; |
4d36ec58 JB |
344 | } |
345 | ||
346 | kfree(local->hw_scan_req); | |
347 | local->hw_scan_req = NULL; | |
f3b85252 | 348 | |
6ea0a69c JB |
349 | scan_req = rcu_dereference_protected(local->scan_req, |
350 | lockdep_is_held(&local->mtx)); | |
351 | ||
352 | if (scan_req != local->int_scan_req) | |
353 | cfg80211_scan_done(scan_req, aborted); | |
354 | RCU_INIT_POINTER(local->scan_req, NULL); | |
a344d677 JB |
355 | |
356 | scan_sdata = rcu_dereference_protected(local->scan_sdata, | |
357 | lockdep_is_held(&local->mtx)); | |
0c2bef46 | 358 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
2a519311 | 359 | |
fbe9c429 | 360 | local->scanning = 0; |
7ca15a0a | 361 | local->scan_chandef.chan = NULL; |
f3b85252 | 362 | |
07ef03ee JB |
363 | /* Set power back to normal operating levels. */ |
364 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 365 | |
8bd2a248 | 366 | if (!hw_scan) { |
e229f844 | 367 | ieee80211_configure_filter(local); |
a344d677 | 368 | drv_sw_scan_complete(local, scan_sdata); |
aacde9ee | 369 | ieee80211_offchannel_return(local); |
e229f844 | 370 | } |
0a51b27e | 371 | |
5cff20e6 | 372 | ieee80211_recalc_idle(local); |
e229f844 | 373 | |
0a51b27e | 374 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 375 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 376 | ieee80211_mesh_notify_scan_completed(local); |
a2b70e83 EP |
377 | if (was_scanning) |
378 | ieee80211_start_next_roc(local); | |
0a51b27e | 379 | } |
8789d459 JB |
380 | |
381 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
382 | { | |
383 | struct ieee80211_local *local = hw_to_local(hw); | |
384 | ||
385 | trace_api_scan_completed(local, aborted); | |
386 | ||
387 | set_bit(SCAN_COMPLETED, &local->scanning); | |
388 | if (aborted) | |
389 | set_bit(SCAN_ABORTED, &local->scanning); | |
390 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
391 | } | |
0a51b27e JB |
392 | EXPORT_SYMBOL(ieee80211_scan_completed); |
393 | ||
a344d677 JB |
394 | static int ieee80211_start_sw_scan(struct ieee80211_local *local, |
395 | struct ieee80211_sub_if_data *sdata) | |
f3b85252 | 396 | { |
fe57d9f5 JB |
397 | /* Software scan is not supported in multi-channel cases */ |
398 | if (local->use_chanctx) | |
399 | return -EOPNOTSUPP; | |
400 | ||
f3b85252 JB |
401 | /* |
402 | * Hardware/driver doesn't support hw_scan, so use software | |
403 | * scanning instead. First send a nullfunc frame with power save | |
404 | * bit on so that AP will buffer the frames for us while we are not | |
405 | * listening, then send probe requests to each channel and wait for | |
406 | * the responses. After all channels are scanned, tune back to the | |
407 | * original channel and send a nullfunc frame with power save bit | |
408 | * off to trigger the AP to send us all the buffered frames. | |
409 | * | |
410 | * Note that while local->sw_scanning is true everything else but | |
411 | * nullfunc frames and probe requests will be dropped in | |
412 | * ieee80211_tx_h_check_assoc(). | |
413 | */ | |
a344d677 | 414 | drv_sw_scan_start(local, sdata, local->scan_addr); |
f3b85252 | 415 | |
de312db3 | 416 | local->leave_oper_channel_time = jiffies; |
977923b0 | 417 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
418 | local->scan_channel_idx = 0; |
419 | ||
aacde9ee | 420 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 421 | |
9c35d7d2 | 422 | /* ensure nullfunc is transmitted before leaving operating channel */ |
3b24f4c6 | 423 | ieee80211_flush_queues(local, NULL, false); |
9c35d7d2 | 424 | |
3ac64bee | 425 | ieee80211_configure_filter(local); |
f3b85252 | 426 | |
59bdf3b0 BG |
427 | /* We need to set power level at maximum rate for scanning. */ |
428 | ieee80211_hw_config(local, 0); | |
429 | ||
42935eca | 430 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 431 | &local->scan_work, 0); |
f3b85252 JB |
432 | |
433 | return 0; | |
434 | } | |
435 | ||
133d40f9 SG |
436 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
437 | struct ieee80211_sub_if_data *sdata) | |
438 | { | |
5cbc95a7 | 439 | if (ieee80211_is_radar_required(local)) |
164eb02d SW |
440 | return false; |
441 | ||
2eb278e0 | 442 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
443 | return false; |
444 | ||
445 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
392b9ffb | 446 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
133d40f9 SG |
447 | return false; |
448 | ||
449 | return true; | |
450 | } | |
451 | ||
452 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
453 | { | |
454 | lockdep_assert_held(&local->mtx); | |
455 | ||
456 | if (!local->scan_req || local->scanning) | |
457 | return; | |
458 | ||
e2fd5dbc JB |
459 | if (!ieee80211_can_scan(local, |
460 | rcu_dereference_protected( | |
461 | local->scan_sdata, | |
462 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
463 | return; |
464 | ||
465 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
466 | round_jiffies_relative(0)); | |
467 | } | |
f3b85252 | 468 | |
8a690674 BG |
469 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
470 | unsigned long *next_delay) | |
471 | { | |
472 | int i; | |
e2fd5dbc | 473 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 474 | struct cfg80211_scan_request *scan_req; |
675a0b04 | 475 | enum ieee80211_band band = local->hw.conf.chandef.chan->band; |
6c17b77b SF |
476 | u32 tx_flags; |
477 | ||
6ea0a69c JB |
478 | scan_req = rcu_dereference_protected(local->scan_req, |
479 | lockdep_is_held(&local->mtx)); | |
480 | ||
6c17b77b | 481 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; |
6ea0a69c | 482 | if (scan_req->no_cck) |
6c17b77b | 483 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; |
8a690674 | 484 | |
e2fd5dbc | 485 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 486 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 487 | |
6ea0a69c | 488 | for (i = 0; i < scan_req->n_ssids; i++) |
8a690674 | 489 | ieee80211_send_probe_req( |
a344d677 | 490 | sdata, local->scan_addr, NULL, |
6ea0a69c JB |
491 | scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, |
492 | scan_req->ie, scan_req->ie_len, | |
493 | scan_req->rates[band], false, | |
675a0b04 | 494 | tx_flags, local->hw.conf.chandef.chan, true); |
8a690674 BG |
495 | |
496 | /* | |
497 | * After sending probe requests, wait for probe responses | |
498 | * on the channel. | |
499 | */ | |
500 | *next_delay = IEEE80211_CHANNEL_TIME; | |
501 | local->next_scan_state = SCAN_DECISION; | |
502 | } | |
503 | ||
f3b85252 JB |
504 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
505 | struct cfg80211_scan_request *req) | |
506 | { | |
507 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
508 | int rc; |
509 | ||
e229f844 SG |
510 | lockdep_assert_held(&local->mtx); |
511 | ||
2726f23d | 512 | if (local->scan_req || ieee80211_is_radar_required(local)) |
f3b85252 JB |
513 | return -EBUSY; |
514 | ||
133d40f9 | 515 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 516 | /* wait for the work to finish/time out */ |
6ea0a69c | 517 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 518 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
519 | return 0; |
520 | } | |
521 | ||
f3b85252 JB |
522 | if (local->ops->hw_scan) { |
523 | u8 *ies; | |
f3b85252 | 524 | |
e4dcbb37 | 525 | local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; |
c56ef672 | 526 | |
30686bf7 | 527 | if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { |
c56ef672 DS |
528 | int i, n_bands = 0; |
529 | u8 bands_counted = 0; | |
530 | ||
531 | for (i = 0; i < req->n_channels; i++) { | |
532 | if (bands_counted & BIT(req->channels[i]->band)) | |
533 | continue; | |
534 | bands_counted |= BIT(req->channels[i]->band); | |
535 | n_bands++; | |
536 | } | |
537 | ||
538 | local->hw_scan_ies_bufsize *= n_bands; | |
539 | } | |
540 | ||
4d36ec58 JB |
541 | local->hw_scan_req = kmalloc( |
542 | sizeof(*local->hw_scan_req) + | |
543 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 544 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 545 | if (!local->hw_scan_req) |
f3b85252 JB |
546 | return -ENOMEM; |
547 | ||
c56ef672 DS |
548 | local->hw_scan_req->req.ssids = req->ssids; |
549 | local->hw_scan_req->req.n_ssids = req->n_ssids; | |
4d36ec58 JB |
550 | ies = (u8 *)local->hw_scan_req + |
551 | sizeof(*local->hw_scan_req) + | |
552 | req->n_channels * sizeof(req->channels[0]); | |
c56ef672 DS |
553 | local->hw_scan_req->req.ie = ies; |
554 | local->hw_scan_req->req.flags = req->flags; | |
4d36ec58 JB |
555 | |
556 | local->hw_scan_band = 0; | |
6e7e6213 JL |
557 | |
558 | /* | |
559 | * After allocating local->hw_scan_req, we must | |
560 | * go through until ieee80211_prep_hw_scan(), so | |
561 | * anything that might be changed here and leave | |
562 | * this function early must not go after this | |
563 | * allocation. | |
564 | */ | |
f3b85252 JB |
565 | } |
566 | ||
6ea0a69c | 567 | rcu_assign_pointer(local->scan_req, req); |
e2fd5dbc | 568 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 569 | |
a344d677 JB |
570 | if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) |
571 | get_random_mask_addr(local->scan_addr, | |
572 | req->mac_addr, | |
573 | req->mac_addr_mask); | |
574 | else | |
575 | memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); | |
576 | ||
8a690674 | 577 | if (local->ops->hw_scan) { |
fbe9c429 | 578 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 579 | } else if ((req->n_channels == 1) && |
675a0b04 | 580 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
581 | /* |
582 | * If we are scanning only on the operating channel | |
583 | * then we do not need to stop normal activities | |
8a690674 BG |
584 | */ |
585 | unsigned long next_delay; | |
586 | ||
587 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
588 | ||
589 | ieee80211_recalc_idle(local); | |
590 | ||
591 | /* Notify driver scan is starting, keep order of operations | |
592 | * same as normal software scan, in case that matters. */ | |
a344d677 | 593 | drv_sw_scan_start(local, sdata, local->scan_addr); |
8a690674 BG |
594 | |
595 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
596 | ||
597 | /* We need to ensure power level is at max for scanning. */ | |
598 | ieee80211_hw_config(local, 0); | |
599 | ||
600 | if ((req->channels[0]->flags & | |
8fe02e16 | 601 | IEEE80211_CHAN_NO_IR) || |
6ea0a69c | 602 | !req->n_ssids) { |
8a690674 BG |
603 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
604 | } else { | |
605 | ieee80211_scan_state_send_probe(local, &next_delay); | |
606 | next_delay = IEEE80211_CHANNEL_TIME; | |
607 | } | |
608 | ||
609 | /* Now, just wait a bit and we are all done! */ | |
610 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
611 | next_delay); | |
612 | return 0; | |
613 | } else { | |
614 | /* Do normal software scan */ | |
fbe9c429 | 615 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 616 | } |
6e7e6213 | 617 | |
5cff20e6 | 618 | ieee80211_recalc_idle(local); |
f3b85252 | 619 | |
4d36ec58 JB |
620 | if (local->ops->hw_scan) { |
621 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 622 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
a344d677 JB |
623 | } else { |
624 | rc = ieee80211_start_sw_scan(local, sdata); | |
625 | } | |
f3b85252 | 626 | |
f3b85252 | 627 | if (rc) { |
4d36ec58 JB |
628 | kfree(local->hw_scan_req); |
629 | local->hw_scan_req = NULL; | |
fbe9c429 | 630 | local->scanning = 0; |
f3b85252 | 631 | |
5cff20e6 JB |
632 | ieee80211_recalc_idle(local); |
633 | ||
f3b85252 | 634 | local->scan_req = NULL; |
0c2bef46 | 635 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 JB |
636 | } |
637 | ||
638 | return rc; | |
639 | } | |
640 | ||
df13cce5 HS |
641 | static unsigned long |
642 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
643 | { | |
644 | /* | |
645 | * TODO: channel switching also consumes quite some time, | |
646 | * add that delay as well to get a better estimation | |
647 | */ | |
8fe02e16 | 648 | if (chan->flags & IEEE80211_CHAN_NO_IR) |
df13cce5 HS |
649 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
650 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
651 | } | |
652 | ||
e229f844 SG |
653 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
654 | unsigned long *next_delay) | |
7d3be3cc | 655 | { |
142b9f50 | 656 | bool associated = false; |
df13cce5 HS |
657 | bool tx_empty = true; |
658 | bool bad_latency; | |
142b9f50 | 659 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 660 | struct ieee80211_channel *next_chan; |
cd2bb512 | 661 | enum mac80211_scan_state next_scan_state; |
6ea0a69c | 662 | struct cfg80211_scan_request *scan_req; |
142b9f50 | 663 | |
df13cce5 HS |
664 | /* |
665 | * check if at least one STA interface is associated, | |
666 | * check if at least one STA interface has pending tx frames | |
667 | * and grab the lowest used beacon interval | |
668 | */ | |
142b9f50 HS |
669 | mutex_lock(&local->iflist_mtx); |
670 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 671 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
672 | continue; |
673 | ||
674 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
675 | if (sdata->u.mgd.associated) { | |
676 | associated = true; | |
df13cce5 | 677 | |
df13cce5 HS |
678 | if (!qdisc_all_tx_empty(sdata->dev)) { |
679 | tx_empty = false; | |
680 | break; | |
681 | } | |
142b9f50 HS |
682 | } |
683 | } | |
684 | } | |
685 | mutex_unlock(&local->iflist_mtx); | |
686 | ||
6ea0a69c JB |
687 | scan_req = rcu_dereference_protected(local->scan_req, |
688 | lockdep_is_held(&local->mtx)); | |
689 | ||
690 | next_chan = scan_req->channels[local->scan_channel_idx]; | |
b23b025f | 691 | |
a80f7c0b | 692 | /* |
07ef03ee JB |
693 | * we're currently scanning a different channel, let's |
694 | * see if we can scan another channel without interfering | |
695 | * with the current traffic situation. | |
696 | * | |
3f892b61 | 697 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 698 | */ |
a80f7c0b | 699 | |
07ef03ee | 700 | bad_latency = time_after(jiffies + |
3f892b61 SG |
701 | ieee80211_scan_get_channel_time(next_chan), |
702 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 703 | |
cd2bb512 | 704 | if (associated && !tx_empty) { |
6ea0a69c | 705 | if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) |
cd2bb512 SL |
706 | next_scan_state = SCAN_ABORT; |
707 | else | |
708 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 709 | } else if (associated && bad_latency) { |
cd2bb512 SL |
710 | next_scan_state = SCAN_SUSPEND; |
711 | } else { | |
712 | next_scan_state = SCAN_SET_CHANNEL; | |
713 | } | |
714 | ||
715 | local->next_scan_state = next_scan_state; | |
142b9f50 | 716 | |
07ef03ee | 717 | *next_delay = 0; |
142b9f50 HS |
718 | } |
719 | ||
2fb3f028 HS |
720 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
721 | unsigned long *next_delay) | |
722 | { | |
723 | int skip; | |
724 | struct ieee80211_channel *chan; | |
7ca15a0a | 725 | enum nl80211_bss_scan_width oper_scan_width; |
6ea0a69c JB |
726 | struct cfg80211_scan_request *scan_req; |
727 | ||
728 | scan_req = rcu_dereference_protected(local->scan_req, | |
729 | lockdep_is_held(&local->mtx)); | |
2fb3f028 | 730 | |
7d3be3cc | 731 | skip = 0; |
6ea0a69c | 732 | chan = scan_req->channels[local->scan_channel_idx]; |
7d3be3cc | 733 | |
7ca15a0a SW |
734 | local->scan_chandef.chan = chan; |
735 | local->scan_chandef.center_freq1 = chan->center_freq; | |
736 | local->scan_chandef.center_freq2 = 0; | |
6ea0a69c | 737 | switch (scan_req->scan_width) { |
7ca15a0a SW |
738 | case NL80211_BSS_CHAN_WIDTH_5: |
739 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; | |
740 | break; | |
741 | case NL80211_BSS_CHAN_WIDTH_10: | |
742 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; | |
743 | break; | |
744 | case NL80211_BSS_CHAN_WIDTH_20: | |
745 | /* If scanning on oper channel, use whatever channel-type | |
746 | * is currently in use. | |
747 | */ | |
748 | oper_scan_width = cfg80211_chandef_to_scan_width( | |
749 | &local->_oper_chandef); | |
750 | if (chan == local->_oper_chandef.chan && | |
6ea0a69c | 751 | oper_scan_width == scan_req->scan_width) |
7ca15a0a SW |
752 | local->scan_chandef = local->_oper_chandef; |
753 | else | |
754 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; | |
755 | break; | |
756 | } | |
b23b025f | 757 | |
07ef03ee JB |
758 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
759 | skip = 1; | |
7d3be3cc | 760 | |
7d3be3cc HS |
761 | /* advance state machine to next channel/band */ |
762 | local->scan_channel_idx++; | |
763 | ||
0ee9c13c HS |
764 | if (skip) { |
765 | /* if we skip this channel return to the decision state */ | |
766 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 767 | return; |
0ee9c13c | 768 | } |
7d3be3cc HS |
769 | |
770 | /* | |
771 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
772 | * (which unfortunately doesn't say _why_ step a) is done, | |
773 | * but it waits for the probe delay or until a frame is | |
774 | * received - and the received frame would update the NAV). | |
775 | * For now, we do not support waiting until a frame is | |
776 | * received. | |
777 | * | |
778 | * In any case, it is not necessary for a passive scan. | |
779 | */ | |
6ea0a69c | 780 | if (chan->flags & IEEE80211_CHAN_NO_IR || !scan_req->n_ssids) { |
7d3be3cc | 781 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; |
977923b0 | 782 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 783 | return; |
7d3be3cc HS |
784 | } |
785 | ||
2fb3f028 | 786 | /* active scan, send probes */ |
7d3be3cc | 787 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 788 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
789 | } |
790 | ||
07ef03ee JB |
791 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
792 | unsigned long *next_delay) | |
793 | { | |
794 | /* switch back to the operating channel */ | |
7ca15a0a | 795 | local->scan_chandef.chan = NULL; |
07ef03ee JB |
796 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
797 | ||
aacde9ee SG |
798 | /* disable PS */ |
799 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
800 | |
801 | *next_delay = HZ / 5; | |
802 | /* afterwards, resume scan & go to next channel */ | |
803 | local->next_scan_state = SCAN_RESUME; | |
804 | } | |
805 | ||
806 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
807 | unsigned long *next_delay) | |
808 | { | |
aacde9ee | 809 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
810 | |
811 | if (local->ops->flush) { | |
3b24f4c6 | 812 | ieee80211_flush_queues(local, NULL, false); |
07ef03ee JB |
813 | *next_delay = 0; |
814 | } else | |
815 | *next_delay = HZ / 10; | |
816 | ||
817 | /* remember when we left the operating channel */ | |
818 | local->leave_oper_channel_time = jiffies; | |
819 | ||
820 | /* advance to the next channel to be scanned */ | |
de2ee84d | 821 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
822 | } |
823 | ||
c2b13452 | 824 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
825 | { |
826 | struct ieee80211_local *local = | |
827 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 828 | struct ieee80211_sub_if_data *sdata; |
6ea0a69c | 829 | struct cfg80211_scan_request *scan_req; |
0a51b27e | 830 | unsigned long next_delay = 0; |
8bd2a248 | 831 | bool aborted; |
0a51b27e | 832 | |
259b62e3 | 833 | mutex_lock(&local->mtx); |
8789d459 | 834 | |
332ff7fe LC |
835 | if (!ieee80211_can_run_worker(local)) { |
836 | aborted = true; | |
837 | goto out_complete; | |
838 | } | |
839 | ||
e2fd5dbc JB |
840 | sdata = rcu_dereference_protected(local->scan_sdata, |
841 | lockdep_is_held(&local->mtx)); | |
6ea0a69c JB |
842 | scan_req = rcu_dereference_protected(local->scan_req, |
843 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 844 | |
8a690674 BG |
845 | /* When scanning on-channel, the first-callback means completed. */ |
846 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
847 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
848 | goto out_complete; | |
849 | } | |
850 | ||
259b62e3 | 851 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 852 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 853 | goto out_complete; |
8789d459 JB |
854 | } |
855 | ||
6ea0a69c | 856 | if (!sdata || !scan_req) |
259b62e3 | 857 | goto out; |
f3b85252 | 858 | |
ff5db439 | 859 | if (!local->scanning) { |
f3b85252 JB |
860 | int rc; |
861 | ||
6ea0a69c | 862 | RCU_INIT_POINTER(local->scan_req, NULL); |
0c2bef46 | 863 | RCU_INIT_POINTER(local->scan_sdata, NULL); |
f3b85252 | 864 | |
6ea0a69c | 865 | rc = __ieee80211_start_scan(sdata, scan_req); |
259b62e3 | 866 | if (rc) { |
3aed49ef | 867 | /* need to complete scan in cfg80211 */ |
6ea0a69c | 868 | rcu_assign_pointer(local->scan_req, scan_req); |
259b62e3 SG |
869 | aborted = true; |
870 | goto out_complete; | |
871 | } else | |
872 | goto out; | |
f3b85252 JB |
873 | } |
874 | ||
f502d09b HS |
875 | /* |
876 | * as long as no delay is required advance immediately | |
877 | * without scheduling a new work | |
878 | */ | |
879 | do { | |
c29acf20 RM |
880 | if (!ieee80211_sdata_running(sdata)) { |
881 | aborted = true; | |
882 | goto out_complete; | |
883 | } | |
884 | ||
977923b0 | 885 | switch (local->next_scan_state) { |
2fb3f028 | 886 | case SCAN_DECISION: |
e229f844 | 887 | /* if no more bands/channels left, complete scan */ |
6ea0a69c | 888 | if (local->scan_channel_idx >= scan_req->n_channels) { |
e229f844 SG |
889 | aborted = false; |
890 | goto out_complete; | |
891 | } | |
892 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 893 | break; |
2fb3f028 HS |
894 | case SCAN_SET_CHANNEL: |
895 | ieee80211_scan_state_set_channel(local, &next_delay); | |
896 | break; | |
f502d09b HS |
897 | case SCAN_SEND_PROBE: |
898 | ieee80211_scan_state_send_probe(local, &next_delay); | |
899 | break; | |
07ef03ee JB |
900 | case SCAN_SUSPEND: |
901 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 902 | break; |
07ef03ee JB |
903 | case SCAN_RESUME: |
904 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 905 | break; |
cd2bb512 SL |
906 | case SCAN_ABORT: |
907 | aborted = true; | |
908 | goto out_complete; | |
f502d09b HS |
909 | } |
910 | } while (next_delay == 0); | |
0a51b27e | 911 | |
42935eca | 912 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 913 | goto out; |
259b62e3 SG |
914 | |
915 | out_complete: | |
8bd2a248 | 916 | __ieee80211_scan_completed(&local->hw, aborted); |
259b62e3 SG |
917 | out: |
918 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
919 | } |
920 | ||
f3b85252 JB |
921 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
922 | struct cfg80211_scan_request *req) | |
0a51b27e | 923 | { |
f3b85252 | 924 | int res; |
de95a54b | 925 | |
a1699b75 | 926 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 927 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 928 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 929 | |
f3b85252 | 930 | return res; |
0a51b27e JB |
931 | } |
932 | ||
34bcf715 SG |
933 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
934 | const u8 *ssid, u8 ssid_len, | |
76bed0f4 JD |
935 | struct ieee80211_channel **channels, |
936 | unsigned int n_channels, | |
7ca15a0a | 937 | enum nl80211_bss_scan_width scan_width) |
0a51b27e | 938 | { |
0a51b27e | 939 | struct ieee80211_local *local = sdata->local; |
76bed0f4 | 940 | int ret = -EBUSY, i, n_ch = 0; |
fb63bc41 | 941 | enum ieee80211_band band; |
2a519311 | 942 | |
a1699b75 | 943 | mutex_lock(&local->mtx); |
0a51b27e | 944 | |
f3b85252 JB |
945 | /* busy scanning */ |
946 | if (local->scan_req) | |
947 | goto unlock; | |
9116dd01 | 948 | |
be4a4b6a | 949 | /* fill internal scan request */ |
76bed0f4 JD |
950 | if (!channels) { |
951 | int max_n; | |
be4a4b6a JB |
952 | |
953 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
954 | if (!local->hw.wiphy->bands[band]) | |
955 | continue; | |
34bcf715 SG |
956 | |
957 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
958 | for (i = 0; i < max_n; i++) { | |
959 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 960 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 | 961 | |
8fe02e16 | 962 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
963 | IEEE80211_CHAN_DISABLED)) |
964 | continue; | |
965 | ||
966 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
967 | n_ch++; | |
be4a4b6a JB |
968 | } |
969 | } | |
970 | ||
34bcf715 SG |
971 | if (WARN_ON_ONCE(n_ch == 0)) |
972 | goto unlock; | |
973 | ||
974 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 975 | } else { |
76bed0f4 JD |
976 | for (i = 0; i < n_channels; i++) { |
977 | if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | | |
978 | IEEE80211_CHAN_DISABLED)) | |
979 | continue; | |
980 | ||
981 | local->int_scan_req->channels[n_ch] = channels[i]; | |
982 | n_ch++; | |
983 | } | |
984 | ||
985 | if (WARN_ON_ONCE(n_ch == 0)) | |
34bcf715 SG |
986 | goto unlock; |
987 | ||
76bed0f4 | 988 | local->int_scan_req->n_channels = n_ch; |
be4a4b6a JB |
989 | } |
990 | ||
991 | local->int_scan_req->ssids = &local->scan_ssid; | |
992 | local->int_scan_req->n_ssids = 1; | |
7ca15a0a | 993 | local->int_scan_req->scan_width = scan_width; |
5ba63533 JB |
994 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
995 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 996 | |
5ba63533 | 997 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 998 | unlock: |
a1699b75 | 999 | mutex_unlock(&local->mtx); |
f3b85252 | 1000 | return ret; |
0a51b27e | 1001 | } |
5bb644a0 | 1002 | |
4136c422 SG |
1003 | /* |
1004 | * Only call this function when a scan can't be queued -- under RTNL. | |
1005 | */ | |
5bb644a0 JB |
1006 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
1007 | { | |
5bb644a0 | 1008 | /* |
b856439b | 1009 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
1010 | * yet really started (see __ieee80211_start_scan ). |
1011 | * | |
1012 | * Regarding hardware scan: | |
1013 | * - we can not call __ieee80211_scan_completed() as when | |
1014 | * SCAN_HW_SCANNING bit is set this function change | |
1015 | * local->hw_scan_req to operate on 5G band, what race with | |
1016 | * driver which can use local->hw_scan_req | |
1017 | * | |
1018 | * - we can not cancel scan_work since driver can schedule it | |
1019 | * by ieee80211_scan_completed(..., true) to finish scan | |
1020 | * | |
b856439b EP |
1021 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
1022 | * driver is still responsible for calling ieee80211_scan_completed() | |
1023 | * after the scan was completed/aborted. | |
5bb644a0 | 1024 | */ |
4136c422 | 1025 | |
a1699b75 | 1026 | mutex_lock(&local->mtx); |
b856439b EP |
1027 | if (!local->scan_req) |
1028 | goto out; | |
1029 | ||
a754055a EG |
1030 | /* |
1031 | * We have a scan running and the driver already reported completion, | |
1032 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
1033 | * cancelled. | |
1034 | */ | |
1035 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
1036 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
1037 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
1038 | goto out; | |
1039 | } | |
1040 | ||
b856439b | 1041 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
a754055a EG |
1042 | /* |
1043 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
1044 | * scan on another band. | |
1045 | */ | |
1046 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 1047 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
1048 | drv_cancel_hw_scan(local, |
1049 | rcu_dereference_protected(local->scan_sdata, | |
1050 | lockdep_is_held(&local->mtx))); | |
b856439b | 1051 | goto out; |
4136c422 | 1052 | } |
b856439b EP |
1053 | |
1054 | /* | |
1055 | * If the work is currently running, it must be blocked on | |
1056 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
1057 | * simply exit once it acquires the mutex. | |
1058 | */ | |
1059 | cancel_delayed_work(&local->scan_work); | |
1060 | /* and clean up */ | |
8bd2a248 | 1061 | __ieee80211_scan_completed(&local->hw, true); |
b856439b | 1062 | out: |
d07bfd8b | 1063 | mutex_unlock(&local->mtx); |
5bb644a0 | 1064 | } |
79f460ca | 1065 | |
d43c6b6e DS |
1066 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
1067 | struct cfg80211_sched_scan_request *req) | |
79f460ca LC |
1068 | { |
1069 | struct ieee80211_local *local = sdata->local; | |
633e2713 | 1070 | struct ieee80211_scan_ies sched_scan_ies = {}; |
2103dec1 | 1071 | struct cfg80211_chan_def chandef; |
633e2713 DS |
1072 | int ret, i, iebufsz, num_bands = 0; |
1073 | u32 rate_masks[IEEE80211_NUM_BANDS] = {}; | |
1074 | u8 bands_used = 0; | |
1075 | u8 *ie; | |
1076 | size_t len; | |
c604b9f2 | 1077 | |
e4dcbb37 | 1078 | iebufsz = local->scan_ies_len + req->ie_len; |
79f460ca | 1079 | |
d43c6b6e | 1080 | lockdep_assert_held(&local->mtx); |
79f460ca | 1081 | |
d43c6b6e DS |
1082 | if (!local->ops->sched_scan_start) |
1083 | return -ENOTSUPP; | |
79f460ca LC |
1084 | |
1085 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
633e2713 DS |
1086 | if (local->hw.wiphy->bands[i]) { |
1087 | bands_used |= BIT(i); | |
1088 | rate_masks[i] = (u32) -1; | |
1089 | num_bands++; | |
79f460ca | 1090 | } |
633e2713 | 1091 | } |
79f460ca | 1092 | |
633e2713 DS |
1093 | ie = kzalloc(num_bands * iebufsz, GFP_KERNEL); |
1094 | if (!ie) { | |
1095 | ret = -ENOMEM; | |
1096 | goto out; | |
79f460ca LC |
1097 | } |
1098 | ||
633e2713 DS |
1099 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
1100 | ||
1101 | len = ieee80211_build_preq_ies(local, ie, num_bands * iebufsz, | |
1102 | &sched_scan_ies, req->ie, | |
1103 | req->ie_len, bands_used, | |
1104 | rate_masks, &chandef); | |
1105 | ||
30dd3edf | 1106 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
d43c6b6e | 1107 | if (ret == 0) { |
5260a5b2 | 1108 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
6ea0a69c | 1109 | rcu_assign_pointer(local->sched_scan_req, req); |
d43c6b6e | 1110 | } |
79f460ca | 1111 | |
633e2713 | 1112 | kfree(ie); |
d43c6b6e | 1113 | |
633e2713 | 1114 | out: |
d43c6b6e DS |
1115 | if (ret) { |
1116 | /* Clean in case of failure after HW restart or upon resume. */ | |
0c2bef46 | 1117 | RCU_INIT_POINTER(local->sched_scan_sdata, NULL); |
6ea0a69c | 1118 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e DS |
1119 | } |
1120 | ||
1121 | return ret; | |
1122 | } | |
1123 | ||
1124 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
1125 | struct cfg80211_sched_scan_request *req) | |
1126 | { | |
1127 | struct ieee80211_local *local = sdata->local; | |
1128 | int ret; | |
1129 | ||
1130 | mutex_lock(&local->mtx); | |
1131 | ||
1132 | if (rcu_access_pointer(local->sched_scan_sdata)) { | |
1133 | mutex_unlock(&local->mtx); | |
1134 | return -EBUSY; | |
1135 | } | |
1136 | ||
1137 | ret = __ieee80211_request_sched_scan_start(sdata, req); | |
1138 | ||
5260a5b2 | 1139 | mutex_unlock(&local->mtx); |
79f460ca LC |
1140 | return ret; |
1141 | } | |
1142 | ||
0d440ea2 | 1143 | int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) |
79f460ca | 1144 | { |
0d440ea2 EP |
1145 | struct ieee80211_sub_if_data *sched_scan_sdata; |
1146 | int ret = -ENOENT; | |
79f460ca | 1147 | |
5260a5b2 | 1148 | mutex_lock(&local->mtx); |
79f460ca LC |
1149 | |
1150 | if (!local->ops->sched_scan_stop) { | |
1151 | ret = -ENOTSUPP; | |
1152 | goto out; | |
1153 | } | |
1154 | ||
d43c6b6e | 1155 | /* We don't want to restart sched scan anymore. */ |
6ea0a69c | 1156 | RCU_INIT_POINTER(local->sched_scan_req, NULL); |
d43c6b6e | 1157 | |
0d440ea2 EP |
1158 | sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, |
1159 | lockdep_is_held(&local->mtx)); | |
1160 | if (sched_scan_sdata) { | |
1161 | ret = drv_sched_scan_stop(local, sched_scan_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); |