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> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
0a51b27e | 15 | #include <linux/if_arp.h> |
888d04df | 16 | #include <linux/etherdevice.h> |
078e1e60 | 17 | #include <linux/rtnetlink.h> |
e8db0be1 | 18 | #include <linux/pm_qos.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; |
7ca15a0a | 69 | enum nl80211_bss_scan_width scan_width; |
2a519311 JB |
70 | s32 signal = 0; |
71 | ||
77965c97 | 72 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 73 | signal = rx_status->signal * 100; |
77965c97 | 74 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 75 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 76 | |
7ca15a0a SW |
77 | scan_width = NL80211_BSS_CHAN_WIDTH_20; |
78 | if (rx_status->flag & RX_FLAG_5MHZ) | |
79 | scan_width = NL80211_BSS_CHAN_WIDTH_5; | |
80 | if (rx_status->flag & RX_FLAG_10MHZ) | |
81 | scan_width = NL80211_BSS_CHAN_WIDTH_10; | |
82 | ||
83 | cbss = cfg80211_inform_bss_width_frame(local->hw.wiphy, channel, | |
84 | scan_width, mgmt, len, signal, | |
85 | GFP_ATOMIC); | |
0c1ad2ca | 86 | if (!cbss) |
00d3f14c JB |
87 | return NULL; |
88 | ||
0c1ad2ca | 89 | bss = (void *)cbss->priv; |
5484e237 | 90 | |
ef429dad JB |
91 | if (beacon) |
92 | bss->device_ts_beacon = rx_status->device_timestamp; | |
93 | else | |
94 | bss->device_ts_presp = rx_status->device_timestamp; | |
8c358bcd | 95 | |
fcff4f10 PS |
96 | if (elems->parse_error) { |
97 | if (beacon) | |
98 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
99 | else | |
100 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
101 | } else { | |
102 | if (beacon) | |
103 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
104 | else | |
105 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
106 | } | |
107 | ||
5484e237 | 108 | /* save the ERP value so that it is available at association time */ |
1946bed9 JB |
109 | if (elems->erp_info && (!elems->parse_error || |
110 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 111 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 112 | bss->has_erp_value = true; |
fcff4f10 PS |
113 | if (!elems->parse_error) |
114 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
115 | } |
116 | ||
f0b058b6 | 117 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
118 | if (!elems->parse_error || |
119 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
120 | srlen = 0; | |
121 | if (elems->supp_rates) { | |
122 | clen = IEEE80211_MAX_SUPP_RATES; | |
123 | if (clen > elems->supp_rates_len) | |
124 | clen = elems->supp_rates_len; | |
125 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
126 | srlen += clen; | |
127 | } | |
128 | if (elems->ext_supp_rates) { | |
129 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
130 | if (clen > elems->ext_supp_rates_len) | |
131 | clen = elems->ext_supp_rates_len; | |
132 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
133 | clen); | |
134 | srlen += clen; | |
135 | } | |
136 | if (srlen) { | |
137 | bss->supp_rates_len = srlen; | |
138 | if (!elems->parse_error) | |
139 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
140 | } | |
5484e237 | 141 | } |
5484e237 | 142 | |
fcff4f10 PS |
143 | if (!elems->parse_error || |
144 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
145 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
146 | bss->uapsd_supported = is_uapsd_supported(elems); | |
147 | if (!elems->parse_error) | |
148 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
149 | } | |
5484e237 | 150 | |
817cee76 AB |
151 | if (beacon) { |
152 | struct ieee80211_supported_band *sband = | |
153 | local->hw.wiphy->bands[rx_status->band]; | |
154 | if (!(rx_status->flag & RX_FLAG_HT) && | |
155 | !(rx_status->flag & RX_FLAG_VHT)) | |
156 | bss->beacon_rate = | |
157 | &sband->bitrates[rx_status->rate_idx]; | |
158 | } | |
159 | ||
5484e237 JB |
160 | return bss; |
161 | } | |
0a51b27e | 162 | |
d48b2968 | 163 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 164 | { |
f1d58c25 | 165 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
166 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
167 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 168 | struct ieee80211_bss *bss; |
98c8fccf JB |
169 | u8 *elements; |
170 | struct ieee80211_channel *channel; | |
171 | size_t baselen; | |
98c8fccf JB |
172 | struct ieee802_11_elems elems; |
173 | ||
d48b2968 JB |
174 | if (skb->len < 24 || |
175 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
176 | !ieee80211_is_beacon(mgmt->frame_control))) | |
177 | return; | |
98c8fccf | 178 | |
d48b2968 JB |
179 | sdata1 = rcu_dereference(local->scan_sdata); |
180 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 181 | |
d48b2968 JB |
182 | if (likely(!sdata1 && !sdata2)) |
183 | return; | |
98c8fccf | 184 | |
d48b2968 | 185 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
98c8fccf | 186 | /* ignore ProbeResp to foreign address */ |
d48b2968 JB |
187 | if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && |
188 | (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) | |
189 | return; | |
98c8fccf | 190 | |
98c8fccf JB |
191 | elements = mgmt->u.probe_resp.variable; |
192 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
193 | } else { | |
98c8fccf JB |
194 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
195 | elements = mgmt->u.beacon.variable; | |
196 | } | |
197 | ||
98c8fccf | 198 | if (baselen > skb->len) |
d48b2968 | 199 | return; |
98c8fccf | 200 | |
b2e506bf | 201 | ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems); |
98c8fccf | 202 | |
0172bb75 | 203 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
204 | |
205 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 206 | return; |
98c8fccf | 207 | |
d48b2968 | 208 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 209 | mgmt, skb->len, &elems, |
d45c4172 | 210 | channel); |
d048e503 | 211 | if (bss) |
d48b2968 | 212 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
213 | } |
214 | ||
2103dec1 SW |
215 | static void |
216 | ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, | |
217 | enum nl80211_bss_scan_width scan_width) | |
218 | { | |
219 | memset(chandef, 0, sizeof(*chandef)); | |
220 | switch (scan_width) { | |
221 | case NL80211_BSS_CHAN_WIDTH_5: | |
222 | chandef->width = NL80211_CHAN_WIDTH_5; | |
223 | break; | |
224 | case NL80211_BSS_CHAN_WIDTH_10: | |
225 | chandef->width = NL80211_CHAN_WIDTH_10; | |
226 | break; | |
227 | default: | |
228 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
229 | break; | |
230 | } | |
231 | } | |
232 | ||
4d36ec58 JB |
233 | /* return false if no more work */ |
234 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
235 | { | |
236 | struct cfg80211_scan_request *req = local->scan_req; | |
2103dec1 | 237 | struct cfg80211_chan_def chandef; |
4d36ec58 JB |
238 | enum ieee80211_band band; |
239 | int i, ielen, n_chans; | |
240 | ||
a754055a EG |
241 | if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) |
242 | return false; | |
243 | ||
4d36ec58 JB |
244 | do { |
245 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
246 | return false; | |
247 | ||
248 | band = local->hw_scan_band; | |
249 | n_chans = 0; | |
250 | for (i = 0; i < req->n_channels; i++) { | |
251 | if (req->channels[i]->band == band) { | |
252 | local->hw_scan_req->channels[n_chans] = | |
253 | req->channels[i]; | |
254 | n_chans++; | |
255 | } | |
256 | } | |
257 | ||
258 | local->hw_scan_band++; | |
259 | } while (!n_chans); | |
260 | ||
261 | local->hw_scan_req->n_channels = n_chans; | |
2103dec1 | 262 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
4d36ec58 JB |
263 | |
264 | ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, | |
c604b9f2 | 265 | local->hw_scan_ies_bufsize, |
8ee31080 | 266 | req->ie, req->ie_len, band, |
2103dec1 | 267 | req->rates[band], &chandef); |
4d36ec58 | 268 | local->hw_scan_req->ie_len = ielen; |
dcd83976 | 269 | local->hw_scan_req->no_cck = req->no_cck; |
4d36ec58 JB |
270 | |
271 | return true; | |
272 | } | |
273 | ||
8bd2a248 | 274 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) |
0a51b27e JB |
275 | { |
276 | struct ieee80211_local *local = hw_to_local(hw); | |
8bd2a248 | 277 | bool hw_scan = local->ops->hw_scan; |
a2b70e83 | 278 | bool was_scanning = local->scanning; |
0a51b27e | 279 | |
e229f844 | 280 | lockdep_assert_held(&local->mtx); |
5bc75728 | 281 | |
6d3560d4 JB |
282 | /* |
283 | * It's ok to abort a not-yet-running scan (that | |
284 | * we have one at all will be verified by checking | |
285 | * local->scan_req next), but not to complete it | |
286 | * successfully. | |
287 | */ | |
288 | if (WARN_ON(!local->scanning && !aborted)) | |
289 | aborted = true; | |
5bc75728 | 290 | |
e229f844 | 291 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 292 | return; |
de95a54b | 293 | |
8bd2a248 | 294 | if (hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
295 | int rc; |
296 | ||
297 | rc = drv_hw_scan(local, | |
298 | rcu_dereference_protected(local->scan_sdata, | |
299 | lockdep_is_held(&local->mtx)), | |
300 | local->hw_scan_req); | |
301 | ||
6eb11a9a | 302 | if (rc == 0) |
d07bfd8b | 303 | return; |
4d36ec58 JB |
304 | } |
305 | ||
306 | kfree(local->hw_scan_req); | |
307 | local->hw_scan_req = NULL; | |
f3b85252 | 308 | |
5ba63533 | 309 | if (local->scan_req != local->int_scan_req) |
2a519311 JB |
310 | cfg80211_scan_done(local->scan_req, aborted); |
311 | local->scan_req = NULL; | |
3aa569c3 | 312 | rcu_assign_pointer(local->scan_sdata, NULL); |
2a519311 | 313 | |
fbe9c429 | 314 | local->scanning = 0; |
7ca15a0a | 315 | local->scan_chandef.chan = NULL; |
f3b85252 | 316 | |
07ef03ee JB |
317 | /* Set power back to normal operating levels. */ |
318 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 319 | |
8bd2a248 | 320 | if (!hw_scan) { |
e229f844 SG |
321 | ieee80211_configure_filter(local); |
322 | drv_sw_scan_complete(local); | |
aacde9ee | 323 | ieee80211_offchannel_return(local); |
e229f844 | 324 | } |
0a51b27e | 325 | |
5cff20e6 | 326 | ieee80211_recalc_idle(local); |
e229f844 | 327 | |
0a51b27e | 328 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 329 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 330 | ieee80211_mesh_notify_scan_completed(local); |
a2b70e83 EP |
331 | if (was_scanning) |
332 | ieee80211_start_next_roc(local); | |
0a51b27e | 333 | } |
8789d459 JB |
334 | |
335 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
336 | { | |
337 | struct ieee80211_local *local = hw_to_local(hw); | |
338 | ||
339 | trace_api_scan_completed(local, aborted); | |
340 | ||
341 | set_bit(SCAN_COMPLETED, &local->scanning); | |
342 | if (aborted) | |
343 | set_bit(SCAN_ABORTED, &local->scanning); | |
344 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
345 | } | |
0a51b27e JB |
346 | EXPORT_SYMBOL(ieee80211_scan_completed); |
347 | ||
f3b85252 JB |
348 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
349 | { | |
fe57d9f5 JB |
350 | /* Software scan is not supported in multi-channel cases */ |
351 | if (local->use_chanctx) | |
352 | return -EOPNOTSUPP; | |
353 | ||
f3b85252 JB |
354 | /* |
355 | * Hardware/driver doesn't support hw_scan, so use software | |
356 | * scanning instead. First send a nullfunc frame with power save | |
357 | * bit on so that AP will buffer the frames for us while we are not | |
358 | * listening, then send probe requests to each channel and wait for | |
359 | * the responses. After all channels are scanned, tune back to the | |
360 | * original channel and send a nullfunc frame with power save bit | |
361 | * off to trigger the AP to send us all the buffered frames. | |
362 | * | |
363 | * Note that while local->sw_scanning is true everything else but | |
364 | * nullfunc frames and probe requests will be dropped in | |
365 | * ieee80211_tx_h_check_assoc(). | |
366 | */ | |
24487981 | 367 | drv_sw_scan_start(local); |
f3b85252 | 368 | |
de312db3 | 369 | local->leave_oper_channel_time = jiffies; |
977923b0 | 370 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
371 | local->scan_channel_idx = 0; |
372 | ||
aacde9ee | 373 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 374 | |
9c35d7d2 | 375 | /* ensure nullfunc is transmitted before leaving operating channel */ |
39ecc01d | 376 | ieee80211_flush_queues(local, NULL); |
9c35d7d2 | 377 | |
3ac64bee | 378 | ieee80211_configure_filter(local); |
f3b85252 | 379 | |
59bdf3b0 BG |
380 | /* We need to set power level at maximum rate for scanning. */ |
381 | ieee80211_hw_config(local, 0); | |
382 | ||
42935eca | 383 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 384 | &local->scan_work, 0); |
f3b85252 JB |
385 | |
386 | return 0; | |
387 | } | |
388 | ||
133d40f9 SG |
389 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
390 | struct ieee80211_sub_if_data *sdata) | |
391 | { | |
164eb02d SW |
392 | if (local->radar_detect_enabled) |
393 | return false; | |
394 | ||
2eb278e0 | 395 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
396 | return false; |
397 | ||
398 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
392b9ffb | 399 | sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) |
133d40f9 SG |
400 | return false; |
401 | ||
402 | return true; | |
403 | } | |
404 | ||
405 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
406 | { | |
407 | lockdep_assert_held(&local->mtx); | |
408 | ||
409 | if (!local->scan_req || local->scanning) | |
410 | return; | |
411 | ||
e2fd5dbc JB |
412 | if (!ieee80211_can_scan(local, |
413 | rcu_dereference_protected( | |
414 | local->scan_sdata, | |
415 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
416 | return; |
417 | ||
418 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
419 | round_jiffies_relative(0)); | |
420 | } | |
f3b85252 | 421 | |
8a690674 BG |
422 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
423 | unsigned long *next_delay) | |
424 | { | |
425 | int i; | |
e2fd5dbc | 426 | struct ieee80211_sub_if_data *sdata; |
675a0b04 | 427 | enum ieee80211_band band = local->hw.conf.chandef.chan->band; |
6c17b77b SF |
428 | u32 tx_flags; |
429 | ||
430 | tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; | |
431 | if (local->scan_req->no_cck) | |
432 | tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; | |
8a690674 | 433 | |
e2fd5dbc | 434 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 435 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 436 | |
8a690674 BG |
437 | for (i = 0; i < local->scan_req->n_ssids; i++) |
438 | ieee80211_send_probe_req( | |
439 | sdata, NULL, | |
440 | local->scan_req->ssids[i].ssid, | |
441 | local->scan_req->ssids[i].ssid_len, | |
442 | local->scan_req->ie, local->scan_req->ie_len, | |
443 | local->scan_req->rates[band], false, | |
675a0b04 | 444 | tx_flags, local->hw.conf.chandef.chan, true); |
8a690674 BG |
445 | |
446 | /* | |
447 | * After sending probe requests, wait for probe responses | |
448 | * on the channel. | |
449 | */ | |
450 | *next_delay = IEEE80211_CHANNEL_TIME; | |
451 | local->next_scan_state = SCAN_DECISION; | |
452 | } | |
453 | ||
f3b85252 JB |
454 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
455 | struct cfg80211_scan_request *req) | |
456 | { | |
457 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
458 | int rc; |
459 | ||
e229f844 SG |
460 | lockdep_assert_held(&local->mtx); |
461 | ||
f3b85252 JB |
462 | if (local->scan_req) |
463 | return -EBUSY; | |
464 | ||
133d40f9 | 465 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 466 | /* wait for the work to finish/time out */ |
c0ce77b8 | 467 | local->scan_req = req; |
e2fd5dbc | 468 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
469 | return 0; |
470 | } | |
471 | ||
f3b85252 JB |
472 | if (local->ops->hw_scan) { |
473 | u8 *ies; | |
f3b85252 | 474 | |
c604b9f2 JB |
475 | local->hw_scan_ies_bufsize = 2 + IEEE80211_MAX_SSID_LEN + |
476 | local->scan_ies_len + | |
477 | req->ie_len; | |
4d36ec58 JB |
478 | local->hw_scan_req = kmalloc( |
479 | sizeof(*local->hw_scan_req) + | |
480 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 481 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 482 | if (!local->hw_scan_req) |
f3b85252 JB |
483 | return -ENOMEM; |
484 | ||
4d36ec58 JB |
485 | local->hw_scan_req->ssids = req->ssids; |
486 | local->hw_scan_req->n_ssids = req->n_ssids; | |
487 | ies = (u8 *)local->hw_scan_req + | |
488 | sizeof(*local->hw_scan_req) + | |
489 | req->n_channels * sizeof(req->channels[0]); | |
490 | local->hw_scan_req->ie = ies; | |
cd2bb512 | 491 | local->hw_scan_req->flags = req->flags; |
4d36ec58 JB |
492 | |
493 | local->hw_scan_band = 0; | |
6e7e6213 JL |
494 | |
495 | /* | |
496 | * After allocating local->hw_scan_req, we must | |
497 | * go through until ieee80211_prep_hw_scan(), so | |
498 | * anything that might be changed here and leave | |
499 | * this function early must not go after this | |
500 | * allocation. | |
501 | */ | |
f3b85252 JB |
502 | } |
503 | ||
504 | local->scan_req = req; | |
e2fd5dbc | 505 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 506 | |
8a690674 | 507 | if (local->ops->hw_scan) { |
fbe9c429 | 508 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 509 | } else if ((req->n_channels == 1) && |
675a0b04 | 510 | (req->channels[0] == local->_oper_chandef.chan)) { |
9b864870 JB |
511 | /* |
512 | * If we are scanning only on the operating channel | |
513 | * then we do not need to stop normal activities | |
8a690674 BG |
514 | */ |
515 | unsigned long next_delay; | |
516 | ||
517 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
518 | ||
519 | ieee80211_recalc_idle(local); | |
520 | ||
521 | /* Notify driver scan is starting, keep order of operations | |
522 | * same as normal software scan, in case that matters. */ | |
523 | drv_sw_scan_start(local); | |
524 | ||
525 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
526 | ||
527 | /* We need to ensure power level is at max for scanning. */ | |
528 | ieee80211_hw_config(local, 0); | |
529 | ||
530 | if ((req->channels[0]->flags & | |
8fe02e16 | 531 | IEEE80211_CHAN_NO_IR) || |
8a690674 BG |
532 | !local->scan_req->n_ssids) { |
533 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
534 | } else { | |
535 | ieee80211_scan_state_send_probe(local, &next_delay); | |
536 | next_delay = IEEE80211_CHANNEL_TIME; | |
537 | } | |
538 | ||
539 | /* Now, just wait a bit and we are all done! */ | |
540 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
541 | next_delay); | |
542 | return 0; | |
543 | } else { | |
544 | /* Do normal software scan */ | |
fbe9c429 | 545 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 546 | } |
6e7e6213 | 547 | |
5cff20e6 | 548 | ieee80211_recalc_idle(local); |
f3b85252 | 549 | |
4d36ec58 JB |
550 | if (local->ops->hw_scan) { |
551 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 552 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
4d36ec58 | 553 | } else |
f3b85252 JB |
554 | rc = ieee80211_start_sw_scan(local); |
555 | ||
f3b85252 | 556 | if (rc) { |
4d36ec58 JB |
557 | kfree(local->hw_scan_req); |
558 | local->hw_scan_req = NULL; | |
fbe9c429 | 559 | local->scanning = 0; |
f3b85252 | 560 | |
5cff20e6 JB |
561 | ieee80211_recalc_idle(local); |
562 | ||
f3b85252 | 563 | local->scan_req = NULL; |
e2fd5dbc | 564 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
565 | } |
566 | ||
567 | return rc; | |
568 | } | |
569 | ||
df13cce5 HS |
570 | static unsigned long |
571 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
572 | { | |
573 | /* | |
574 | * TODO: channel switching also consumes quite some time, | |
575 | * add that delay as well to get a better estimation | |
576 | */ | |
8fe02e16 | 577 | if (chan->flags & IEEE80211_CHAN_NO_IR) |
df13cce5 HS |
578 | return IEEE80211_PASSIVE_CHANNEL_TIME; |
579 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
580 | } | |
581 | ||
e229f844 SG |
582 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
583 | unsigned long *next_delay) | |
7d3be3cc | 584 | { |
142b9f50 | 585 | bool associated = false; |
df13cce5 HS |
586 | bool tx_empty = true; |
587 | bool bad_latency; | |
142b9f50 | 588 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 589 | struct ieee80211_channel *next_chan; |
cd2bb512 | 590 | enum mac80211_scan_state next_scan_state; |
142b9f50 | 591 | |
df13cce5 HS |
592 | /* |
593 | * check if at least one STA interface is associated, | |
594 | * check if at least one STA interface has pending tx frames | |
595 | * and grab the lowest used beacon interval | |
596 | */ | |
142b9f50 HS |
597 | mutex_lock(&local->iflist_mtx); |
598 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 599 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
600 | continue; |
601 | ||
602 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
603 | if (sdata->u.mgd.associated) { | |
604 | associated = true; | |
df13cce5 | 605 | |
df13cce5 HS |
606 | if (!qdisc_all_tx_empty(sdata->dev)) { |
607 | tx_empty = false; | |
608 | break; | |
609 | } | |
142b9f50 HS |
610 | } |
611 | } | |
612 | } | |
613 | mutex_unlock(&local->iflist_mtx); | |
614 | ||
b23b025f BG |
615 | next_chan = local->scan_req->channels[local->scan_channel_idx]; |
616 | ||
a80f7c0b | 617 | /* |
07ef03ee JB |
618 | * we're currently scanning a different channel, let's |
619 | * see if we can scan another channel without interfering | |
620 | * with the current traffic situation. | |
621 | * | |
3f892b61 | 622 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 623 | */ |
a80f7c0b | 624 | |
07ef03ee | 625 | bad_latency = time_after(jiffies + |
3f892b61 SG |
626 | ieee80211_scan_get_channel_time(next_chan), |
627 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 628 | |
cd2bb512 SL |
629 | if (associated && !tx_empty) { |
630 | if (local->scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) | |
631 | next_scan_state = SCAN_ABORT; | |
632 | else | |
633 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 634 | } else if (associated && bad_latency) { |
cd2bb512 SL |
635 | next_scan_state = SCAN_SUSPEND; |
636 | } else { | |
637 | next_scan_state = SCAN_SET_CHANNEL; | |
638 | } | |
639 | ||
640 | local->next_scan_state = next_scan_state; | |
142b9f50 | 641 | |
07ef03ee | 642 | *next_delay = 0; |
142b9f50 HS |
643 | } |
644 | ||
2fb3f028 HS |
645 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
646 | unsigned long *next_delay) | |
647 | { | |
648 | int skip; | |
649 | struct ieee80211_channel *chan; | |
7ca15a0a | 650 | enum nl80211_bss_scan_width oper_scan_width; |
2fb3f028 | 651 | |
7d3be3cc HS |
652 | skip = 0; |
653 | chan = local->scan_req->channels[local->scan_channel_idx]; | |
654 | ||
7ca15a0a SW |
655 | local->scan_chandef.chan = chan; |
656 | local->scan_chandef.center_freq1 = chan->center_freq; | |
657 | local->scan_chandef.center_freq2 = 0; | |
658 | switch (local->scan_req->scan_width) { | |
659 | case NL80211_BSS_CHAN_WIDTH_5: | |
660 | local->scan_chandef.width = NL80211_CHAN_WIDTH_5; | |
661 | break; | |
662 | case NL80211_BSS_CHAN_WIDTH_10: | |
663 | local->scan_chandef.width = NL80211_CHAN_WIDTH_10; | |
664 | break; | |
665 | case NL80211_BSS_CHAN_WIDTH_20: | |
666 | /* If scanning on oper channel, use whatever channel-type | |
667 | * is currently in use. | |
668 | */ | |
669 | oper_scan_width = cfg80211_chandef_to_scan_width( | |
670 | &local->_oper_chandef); | |
671 | if (chan == local->_oper_chandef.chan && | |
672 | oper_scan_width == local->scan_req->scan_width) | |
673 | local->scan_chandef = local->_oper_chandef; | |
674 | else | |
675 | local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; | |
676 | break; | |
677 | } | |
b23b025f | 678 | |
07ef03ee JB |
679 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
680 | skip = 1; | |
7d3be3cc | 681 | |
7d3be3cc HS |
682 | /* advance state machine to next channel/band */ |
683 | local->scan_channel_idx++; | |
684 | ||
0ee9c13c HS |
685 | if (skip) { |
686 | /* if we skip this channel return to the decision state */ | |
687 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 688 | return; |
0ee9c13c | 689 | } |
7d3be3cc HS |
690 | |
691 | /* | |
692 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
693 | * (which unfortunately doesn't say _why_ step a) is done, | |
694 | * but it waits for the probe delay or until a frame is | |
695 | * received - and the received frame would update the NAV). | |
696 | * For now, we do not support waiting until a frame is | |
697 | * received. | |
698 | * | |
699 | * In any case, it is not necessary for a passive scan. | |
700 | */ | |
8fe02e16 | 701 | if (chan->flags & IEEE80211_CHAN_NO_IR || |
7d3be3cc HS |
702 | !local->scan_req->n_ssids) { |
703 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
977923b0 | 704 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 705 | return; |
7d3be3cc HS |
706 | } |
707 | ||
2fb3f028 | 708 | /* active scan, send probes */ |
7d3be3cc | 709 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 710 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
711 | } |
712 | ||
07ef03ee JB |
713 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
714 | unsigned long *next_delay) | |
715 | { | |
716 | /* switch back to the operating channel */ | |
7ca15a0a | 717 | local->scan_chandef.chan = NULL; |
07ef03ee JB |
718 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
719 | ||
aacde9ee SG |
720 | /* disable PS */ |
721 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
722 | |
723 | *next_delay = HZ / 5; | |
724 | /* afterwards, resume scan & go to next channel */ | |
725 | local->next_scan_state = SCAN_RESUME; | |
726 | } | |
727 | ||
728 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
729 | unsigned long *next_delay) | |
730 | { | |
aacde9ee | 731 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
732 | |
733 | if (local->ops->flush) { | |
39ecc01d | 734 | ieee80211_flush_queues(local, NULL); |
07ef03ee JB |
735 | *next_delay = 0; |
736 | } else | |
737 | *next_delay = HZ / 10; | |
738 | ||
739 | /* remember when we left the operating channel */ | |
740 | local->leave_oper_channel_time = jiffies; | |
741 | ||
742 | /* advance to the next channel to be scanned */ | |
de2ee84d | 743 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
744 | } |
745 | ||
c2b13452 | 746 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
747 | { |
748 | struct ieee80211_local *local = | |
749 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 750 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 751 | unsigned long next_delay = 0; |
8bd2a248 | 752 | bool aborted; |
0a51b27e | 753 | |
259b62e3 | 754 | mutex_lock(&local->mtx); |
8789d459 | 755 | |
e2fd5dbc JB |
756 | sdata = rcu_dereference_protected(local->scan_sdata, |
757 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 758 | |
8a690674 BG |
759 | /* When scanning on-channel, the first-callback means completed. */ |
760 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
761 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
762 | goto out_complete; | |
763 | } | |
764 | ||
259b62e3 | 765 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 766 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 767 | goto out_complete; |
8789d459 JB |
768 | } |
769 | ||
259b62e3 SG |
770 | if (!sdata || !local->scan_req) |
771 | goto out; | |
f3b85252 | 772 | |
fbe9c429 | 773 | if (local->scan_req && !local->scanning) { |
f3b85252 JB |
774 | struct cfg80211_scan_request *req = local->scan_req; |
775 | int rc; | |
776 | ||
777 | local->scan_req = NULL; | |
e2fd5dbc | 778 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
779 | |
780 | rc = __ieee80211_start_scan(sdata, req); | |
259b62e3 | 781 | if (rc) { |
3aed49ef SG |
782 | /* need to complete scan in cfg80211 */ |
783 | local->scan_req = req; | |
259b62e3 SG |
784 | aborted = true; |
785 | goto out_complete; | |
786 | } else | |
787 | goto out; | |
f3b85252 JB |
788 | } |
789 | ||
f502d09b HS |
790 | /* |
791 | * as long as no delay is required advance immediately | |
792 | * without scheduling a new work | |
793 | */ | |
794 | do { | |
c29acf20 RM |
795 | if (!ieee80211_sdata_running(sdata)) { |
796 | aborted = true; | |
797 | goto out_complete; | |
798 | } | |
799 | ||
977923b0 | 800 | switch (local->next_scan_state) { |
2fb3f028 | 801 | case SCAN_DECISION: |
e229f844 SG |
802 | /* if no more bands/channels left, complete scan */ |
803 | if (local->scan_channel_idx >= local->scan_req->n_channels) { | |
804 | aborted = false; | |
805 | goto out_complete; | |
806 | } | |
807 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 808 | break; |
2fb3f028 HS |
809 | case SCAN_SET_CHANNEL: |
810 | ieee80211_scan_state_set_channel(local, &next_delay); | |
811 | break; | |
f502d09b HS |
812 | case SCAN_SEND_PROBE: |
813 | ieee80211_scan_state_send_probe(local, &next_delay); | |
814 | break; | |
07ef03ee JB |
815 | case SCAN_SUSPEND: |
816 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 817 | break; |
07ef03ee JB |
818 | case SCAN_RESUME: |
819 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 820 | break; |
cd2bb512 SL |
821 | case SCAN_ABORT: |
822 | aborted = true; | |
823 | goto out_complete; | |
f502d09b HS |
824 | } |
825 | } while (next_delay == 0); | |
0a51b27e | 826 | |
42935eca | 827 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 828 | goto out; |
259b62e3 SG |
829 | |
830 | out_complete: | |
8bd2a248 | 831 | __ieee80211_scan_completed(&local->hw, aborted); |
259b62e3 SG |
832 | out: |
833 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
834 | } |
835 | ||
f3b85252 JB |
836 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
837 | struct cfg80211_scan_request *req) | |
0a51b27e | 838 | { |
f3b85252 | 839 | int res; |
de95a54b | 840 | |
a1699b75 | 841 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 842 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 843 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 844 | |
f3b85252 | 845 | return res; |
0a51b27e JB |
846 | } |
847 | ||
34bcf715 SG |
848 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
849 | const u8 *ssid, u8 ssid_len, | |
7ca15a0a SW |
850 | struct ieee80211_channel *chan, |
851 | enum nl80211_bss_scan_width scan_width) | |
0a51b27e | 852 | { |
0a51b27e | 853 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 854 | int ret = -EBUSY; |
fb63bc41 | 855 | enum ieee80211_band band; |
2a519311 | 856 | |
a1699b75 | 857 | mutex_lock(&local->mtx); |
0a51b27e | 858 | |
f3b85252 JB |
859 | /* busy scanning */ |
860 | if (local->scan_req) | |
861 | goto unlock; | |
9116dd01 | 862 | |
be4a4b6a JB |
863 | /* fill internal scan request */ |
864 | if (!chan) { | |
34bcf715 SG |
865 | int i, max_n; |
866 | int n_ch = 0; | |
be4a4b6a JB |
867 | |
868 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
869 | if (!local->hw.wiphy->bands[band]) | |
870 | continue; | |
34bcf715 SG |
871 | |
872 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
873 | for (i = 0; i < max_n; i++) { | |
874 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 875 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 | 876 | |
8fe02e16 | 877 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
878 | IEEE80211_CHAN_DISABLED)) |
879 | continue; | |
880 | ||
881 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
882 | n_ch++; | |
be4a4b6a JB |
883 | } |
884 | } | |
885 | ||
34bcf715 SG |
886 | if (WARN_ON_ONCE(n_ch == 0)) |
887 | goto unlock; | |
888 | ||
889 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 890 | } else { |
8fe02e16 | 891 | if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IR | |
34bcf715 SG |
892 | IEEE80211_CHAN_DISABLED))) |
893 | goto unlock; | |
894 | ||
be4a4b6a JB |
895 | local->int_scan_req->channels[0] = chan; |
896 | local->int_scan_req->n_channels = 1; | |
897 | } | |
898 | ||
899 | local->int_scan_req->ssids = &local->scan_ssid; | |
900 | local->int_scan_req->n_ssids = 1; | |
7ca15a0a | 901 | local->int_scan_req->scan_width = scan_width; |
5ba63533 JB |
902 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
903 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 904 | |
5ba63533 | 905 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 906 | unlock: |
a1699b75 | 907 | mutex_unlock(&local->mtx); |
f3b85252 | 908 | return ret; |
0a51b27e | 909 | } |
5bb644a0 | 910 | |
4136c422 SG |
911 | /* |
912 | * Only call this function when a scan can't be queued -- under RTNL. | |
913 | */ | |
5bb644a0 JB |
914 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
915 | { | |
5bb644a0 | 916 | /* |
b856439b | 917 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
918 | * yet really started (see __ieee80211_start_scan ). |
919 | * | |
920 | * Regarding hardware scan: | |
921 | * - we can not call __ieee80211_scan_completed() as when | |
922 | * SCAN_HW_SCANNING bit is set this function change | |
923 | * local->hw_scan_req to operate on 5G band, what race with | |
924 | * driver which can use local->hw_scan_req | |
925 | * | |
926 | * - we can not cancel scan_work since driver can schedule it | |
927 | * by ieee80211_scan_completed(..., true) to finish scan | |
928 | * | |
b856439b EP |
929 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
930 | * driver is still responsible for calling ieee80211_scan_completed() | |
931 | * after the scan was completed/aborted. | |
5bb644a0 | 932 | */ |
4136c422 | 933 | |
a1699b75 | 934 | mutex_lock(&local->mtx); |
b856439b EP |
935 | if (!local->scan_req) |
936 | goto out; | |
937 | ||
a754055a EG |
938 | /* |
939 | * We have a scan running and the driver already reported completion, | |
940 | * but the worker hasn't run yet or is stuck on the mutex - mark it as | |
941 | * cancelled. | |
942 | */ | |
943 | if (test_bit(SCAN_HW_SCANNING, &local->scanning) && | |
944 | test_bit(SCAN_COMPLETED, &local->scanning)) { | |
945 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
946 | goto out; | |
947 | } | |
948 | ||
b856439b | 949 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { |
a754055a EG |
950 | /* |
951 | * Make sure that __ieee80211_scan_completed doesn't trigger a | |
952 | * scan on another band. | |
953 | */ | |
954 | set_bit(SCAN_HW_CANCELLED, &local->scanning); | |
b856439b | 955 | if (local->ops->cancel_hw_scan) |
e2fd5dbc JB |
956 | drv_cancel_hw_scan(local, |
957 | rcu_dereference_protected(local->scan_sdata, | |
958 | lockdep_is_held(&local->mtx))); | |
b856439b | 959 | goto out; |
4136c422 | 960 | } |
b856439b EP |
961 | |
962 | /* | |
963 | * If the work is currently running, it must be blocked on | |
964 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
965 | * simply exit once it acquires the mutex. | |
966 | */ | |
967 | cancel_delayed_work(&local->scan_work); | |
968 | /* and clean up */ | |
8bd2a248 | 969 | __ieee80211_scan_completed(&local->hw, true); |
b856439b | 970 | out: |
d07bfd8b | 971 | mutex_unlock(&local->mtx); |
5bb644a0 | 972 | } |
79f460ca | 973 | |
d43c6b6e DS |
974 | int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, |
975 | struct cfg80211_sched_scan_request *req) | |
79f460ca LC |
976 | { |
977 | struct ieee80211_local *local = sdata->local; | |
bca1e29f | 978 | struct ieee80211_sched_scan_ies sched_scan_ies = {}; |
2103dec1 | 979 | struct cfg80211_chan_def chandef; |
c604b9f2 JB |
980 | int ret, i, iebufsz; |
981 | ||
982 | iebufsz = 2 + IEEE80211_MAX_SSID_LEN + | |
983 | local->scan_ies_len + req->ie_len; | |
79f460ca | 984 | |
d43c6b6e | 985 | lockdep_assert_held(&local->mtx); |
79f460ca | 986 | |
d43c6b6e DS |
987 | if (!local->ops->sched_scan_start) |
988 | return -ENOTSUPP; | |
79f460ca LC |
989 | |
990 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
d811b3d5 AN |
991 | if (!local->hw.wiphy->bands[i]) |
992 | continue; | |
993 | ||
c604b9f2 | 994 | sched_scan_ies.ie[i] = kzalloc(iebufsz, GFP_KERNEL); |
30dd3edf | 995 | if (!sched_scan_ies.ie[i]) { |
79f460ca LC |
996 | ret = -ENOMEM; |
997 | goto out_free; | |
998 | } | |
999 | ||
2103dec1 SW |
1000 | ieee80211_prepare_scan_chandef(&chandef, req->scan_width); |
1001 | ||
30dd3edf JB |
1002 | sched_scan_ies.len[i] = |
1003 | ieee80211_build_preq_ies(local, sched_scan_ies.ie[i], | |
c604b9f2 | 1004 | iebufsz, req->ie, req->ie_len, |
2103dec1 | 1005 | i, (u32) -1, &chandef); |
79f460ca LC |
1006 | } |
1007 | ||
30dd3edf | 1008 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
d43c6b6e | 1009 | if (ret == 0) { |
5260a5b2 | 1010 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
d43c6b6e DS |
1011 | local->sched_scan_req = req; |
1012 | } | |
79f460ca LC |
1013 | |
1014 | out_free: | |
1015 | while (i > 0) | |
30dd3edf | 1016 | kfree(sched_scan_ies.ie[--i]); |
d43c6b6e DS |
1017 | |
1018 | if (ret) { | |
1019 | /* Clean in case of failure after HW restart or upon resume. */ | |
1020 | rcu_assign_pointer(local->sched_scan_sdata, NULL); | |
1021 | local->sched_scan_req = NULL; | |
1022 | } | |
1023 | ||
1024 | return ret; | |
1025 | } | |
1026 | ||
1027 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
1028 | struct cfg80211_sched_scan_request *req) | |
1029 | { | |
1030 | struct ieee80211_local *local = sdata->local; | |
1031 | int ret; | |
1032 | ||
1033 | mutex_lock(&local->mtx); | |
1034 | ||
1035 | if (rcu_access_pointer(local->sched_scan_sdata)) { | |
1036 | mutex_unlock(&local->mtx); | |
1037 | return -EBUSY; | |
1038 | } | |
1039 | ||
1040 | ret = __ieee80211_request_sched_scan_start(sdata, req); | |
1041 | ||
5260a5b2 | 1042 | mutex_unlock(&local->mtx); |
79f460ca LC |
1043 | return ret; |
1044 | } | |
1045 | ||
85a9994a | 1046 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) |
79f460ca LC |
1047 | { |
1048 | struct ieee80211_local *local = sdata->local; | |
30dd3edf | 1049 | int ret = 0; |
79f460ca | 1050 | |
5260a5b2 | 1051 | mutex_lock(&local->mtx); |
79f460ca LC |
1052 | |
1053 | if (!local->ops->sched_scan_stop) { | |
1054 | ret = -ENOTSUPP; | |
1055 | goto out; | |
1056 | } | |
1057 | ||
d43c6b6e DS |
1058 | /* We don't want to restart sched scan anymore. */ |
1059 | local->sched_scan_req = NULL; | |
1060 | ||
30dd3edf | 1061 | if (rcu_access_pointer(local->sched_scan_sdata)) |
85a9994a | 1062 | drv_sched_scan_stop(local, sdata); |
30dd3edf | 1063 | |
79f460ca | 1064 | out: |
5260a5b2 | 1065 | mutex_unlock(&local->mtx); |
79f460ca LC |
1066 | |
1067 | return ret; | |
1068 | } | |
1069 | ||
1070 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
1071 | { | |
1072 | struct ieee80211_local *local = hw_to_local(hw); | |
1073 | ||
1074 | trace_api_sched_scan_results(local); | |
1075 | ||
1076 | cfg80211_sched_scan_results(hw->wiphy); | |
1077 | } | |
1078 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
1079 | ||
85a9994a LC |
1080 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
1081 | { | |
1082 | struct ieee80211_local *local = | |
1083 | container_of(work, struct ieee80211_local, | |
1084 | sched_scan_stopped_work); | |
85a9994a LC |
1085 | |
1086 | mutex_lock(&local->mtx); | |
1087 | ||
5260a5b2 | 1088 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
1089 | mutex_unlock(&local->mtx); |
1090 | return; | |
1091 | } | |
1092 | ||
5260a5b2 | 1093 | rcu_assign_pointer(local->sched_scan_sdata, NULL); |
85a9994a | 1094 | |
d43c6b6e DS |
1095 | /* If sched scan was aborted by the driver. */ |
1096 | local->sched_scan_req = NULL; | |
1097 | ||
85a9994a LC |
1098 | mutex_unlock(&local->mtx); |
1099 | ||
1100 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
1101 | } | |
1102 | ||
79f460ca LC |
1103 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
1104 | { | |
1105 | struct ieee80211_local *local = hw_to_local(hw); | |
1106 | ||
1107 | trace_api_sched_scan_stopped(local); | |
1108 | ||
18db594a | 1109 | schedule_work(&local->sched_scan_stopped_work); |
79f460ca LC |
1110 | } |
1111 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |