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Commit | Line | Data |
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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> | |
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> |
078e1e60 | 16 | #include <linux/rtnetlink.h> |
df13cce5 | 17 | #include <linux/pm_qos_params.h> |
79f460ca | 18 | #include <linux/slab.h> |
df13cce5 | 19 | #include <net/sch_generic.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
0a51b27e | 21 | #include <net/mac80211.h> |
0a51b27e JB |
22 | |
23 | #include "ieee80211_i.h" | |
24487981 | 24 | #include "driver-ops.h" |
5484e237 | 25 | #include "mesh.h" |
0a51b27e JB |
26 | |
27 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
28 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
96f7e739 | 29 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) |
0a51b27e | 30 | |
c2b13452 | 31 | struct ieee80211_bss * |
5484e237 JB |
32 | ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, |
33 | u8 *ssid, u8 ssid_len) | |
34 | { | |
0c1ad2ca JB |
35 | struct cfg80211_bss *cbss; |
36 | ||
37 | cbss = cfg80211_get_bss(local->hw.wiphy, | |
38 | ieee80211_get_channel(local->hw.wiphy, freq), | |
39 | bssid, ssid, ssid_len, 0, 0); | |
40 | if (!cbss) | |
41 | return NULL; | |
42 | return (void *)cbss->priv; | |
5484e237 JB |
43 | } |
44 | ||
00d3f14c | 45 | static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) |
5484e237 | 46 | { |
0c1ad2ca | 47 | struct ieee80211_bss *bss = (void *)cbss->priv; |
5484e237 | 48 | |
5484e237 JB |
49 | kfree(bss_mesh_id(bss)); |
50 | kfree(bss_mesh_cfg(bss)); | |
5484e237 JB |
51 | } |
52 | ||
53 | void ieee80211_rx_bss_put(struct ieee80211_local *local, | |
c2b13452 | 54 | struct ieee80211_bss *bss) |
5484e237 | 55 | { |
0c1ad2ca JB |
56 | if (!bss) |
57 | return; | |
58 | cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv)); | |
5484e237 JB |
59 | } |
60 | ||
ab13315a KV |
61 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
62 | { | |
63 | u8 qos_info; | |
64 | ||
65 | if (elems->wmm_info && elems->wmm_info_len == 7 | |
66 | && elems->wmm_info[5] == 1) | |
67 | qos_info = elems->wmm_info[6]; | |
68 | else if (elems->wmm_param && elems->wmm_param_len == 24 | |
69 | && elems->wmm_param[5] == 1) | |
70 | qos_info = elems->wmm_param[6]; | |
71 | else | |
72 | /* no valid wmm information or parameter element found */ | |
73 | return false; | |
74 | ||
75 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; | |
76 | } | |
77 | ||
c2b13452 | 78 | struct ieee80211_bss * |
5484e237 JB |
79 | ieee80211_bss_info_update(struct ieee80211_local *local, |
80 | struct ieee80211_rx_status *rx_status, | |
81 | struct ieee80211_mgmt *mgmt, | |
82 | size_t len, | |
83 | struct ieee802_11_elems *elems, | |
2a519311 JB |
84 | struct ieee80211_channel *channel, |
85 | bool beacon) | |
5484e237 | 86 | { |
0c1ad2ca | 87 | struct cfg80211_bss *cbss; |
c2b13452 | 88 | struct ieee80211_bss *bss; |
f0b058b6 | 89 | int clen, srlen; |
2a519311 JB |
90 | s32 signal = 0; |
91 | ||
77965c97 | 92 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 93 | signal = rx_status->signal * 100; |
77965c97 | 94 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 95 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 96 | |
0c1ad2ca JB |
97 | cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
98 | mgmt, len, signal, GFP_ATOMIC); | |
5484e237 | 99 | |
0c1ad2ca | 100 | if (!cbss) |
00d3f14c JB |
101 | return NULL; |
102 | ||
0c1ad2ca JB |
103 | cbss->free_priv = ieee80211_rx_bss_free; |
104 | bss = (void *)cbss->priv; | |
5484e237 JB |
105 | |
106 | /* save the ERP value so that it is available at association time */ | |
107 | if (elems->erp_info && elems->erp_info_len >= 1) { | |
108 | bss->erp_value = elems->erp_info[0]; | |
109 | bss->has_erp_value = 1; | |
110 | } | |
111 | ||
5484e237 JB |
112 | if (elems->tim) { |
113 | struct ieee80211_tim_ie *tim_ie = | |
114 | (struct ieee80211_tim_ie *)elems->tim; | |
115 | bss->dtim_period = tim_ie->dtim_period; | |
116 | } | |
117 | ||
e5b900d2 JB |
118 | /* If the beacon had no TIM IE, or it was invalid, use 1 */ |
119 | if (beacon && !bss->dtim_period) | |
120 | bss->dtim_period = 1; | |
121 | ||
f0b058b6 SG |
122 | /* replace old supported rates if we get new values */ |
123 | srlen = 0; | |
5484e237 | 124 | if (elems->supp_rates) { |
f0b058b6 | 125 | clen = IEEE80211_MAX_SUPP_RATES; |
5484e237 JB |
126 | if (clen > elems->supp_rates_len) |
127 | clen = elems->supp_rates_len; | |
f0b058b6 SG |
128 | memcpy(bss->supp_rates, elems->supp_rates, clen); |
129 | srlen += clen; | |
5484e237 JB |
130 | } |
131 | if (elems->ext_supp_rates) { | |
f0b058b6 | 132 | clen = IEEE80211_MAX_SUPP_RATES - srlen; |
5484e237 JB |
133 | if (clen > elems->ext_supp_rates_len) |
134 | clen = elems->ext_supp_rates_len; | |
f0b058b6 SG |
135 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, clen); |
136 | srlen += clen; | |
5484e237 | 137 | } |
f0b058b6 SG |
138 | if (srlen) |
139 | bss->supp_rates_len = srlen; | |
5484e237 | 140 | |
5484e237 | 141 | bss->wmm_used = elems->wmm_param || elems->wmm_info; |
ab13315a | 142 | bss->uapsd_supported = is_uapsd_supported(elems); |
5484e237 JB |
143 | |
144 | if (!beacon) | |
145 | bss->last_probe_resp = jiffies; | |
146 | ||
5484e237 JB |
147 | return bss; |
148 | } | |
0a51b27e | 149 | |
98c8fccf | 150 | ieee80211_rx_result |
f1d58c25 | 151 | ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
98c8fccf | 152 | { |
f1d58c25 | 153 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
98c8fccf | 154 | struct ieee80211_mgmt *mgmt; |
c2b13452 | 155 | struct ieee80211_bss *bss; |
98c8fccf JB |
156 | u8 *elements; |
157 | struct ieee80211_channel *channel; | |
158 | size_t baselen; | |
159 | int freq; | |
160 | __le16 fc; | |
161 | bool presp, beacon = false; | |
162 | struct ieee802_11_elems elems; | |
163 | ||
164 | if (skb->len < 2) | |
165 | return RX_DROP_UNUSABLE; | |
166 | ||
167 | mgmt = (struct ieee80211_mgmt *) skb->data; | |
168 | fc = mgmt->frame_control; | |
169 | ||
170 | if (ieee80211_is_ctl(fc)) | |
171 | return RX_CONTINUE; | |
172 | ||
173 | if (skb->len < 24) | |
306fe938 | 174 | return RX_CONTINUE; |
98c8fccf JB |
175 | |
176 | presp = ieee80211_is_probe_resp(fc); | |
177 | if (presp) { | |
178 | /* ignore ProbeResp to foreign address */ | |
47846c9b | 179 | if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN)) |
98c8fccf JB |
180 | return RX_DROP_MONITOR; |
181 | ||
182 | presp = true; | |
183 | elements = mgmt->u.probe_resp.variable; | |
184 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
185 | } else { | |
186 | beacon = ieee80211_is_beacon(fc); | |
187 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); | |
188 | elements = mgmt->u.beacon.variable; | |
189 | } | |
190 | ||
191 | if (!presp && !beacon) | |
192 | return RX_CONTINUE; | |
193 | ||
194 | if (baselen > skb->len) | |
195 | return RX_DROP_MONITOR; | |
196 | ||
197 | ieee802_11_parse_elems(elements, skb->len - baselen, &elems); | |
198 | ||
199 | if (elems.ds_params && elems.ds_params_len == 1) | |
59eb21a6 BR |
200 | freq = ieee80211_channel_to_frequency(elems.ds_params[0], |
201 | rx_status->band); | |
98c8fccf JB |
202 | else |
203 | freq = rx_status->freq; | |
204 | ||
205 | channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); | |
206 | ||
207 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
208 | return RX_DROP_MONITOR; | |
209 | ||
210 | bss = ieee80211_bss_info_update(sdata->local, rx_status, | |
211 | mgmt, skb->len, &elems, | |
2a519311 | 212 | channel, beacon); |
d048e503 JM |
213 | if (bss) |
214 | ieee80211_rx_bss_put(sdata->local, bss); | |
98c8fccf | 215 | |
b23b025f BG |
216 | /* If we are on-operating-channel, and this packet is for the |
217 | * current channel, pass the pkt on up the stack so that | |
218 | * the rest of the stack can make use of it. | |
219 | */ | |
220 | if (ieee80211_cfg_on_oper_channel(sdata->local) | |
221 | && (channel == sdata->local->oper_channel)) | |
222 | return RX_CONTINUE; | |
223 | ||
98c8fccf JB |
224 | dev_kfree_skb(skb); |
225 | return RX_QUEUED; | |
226 | } | |
227 | ||
4d36ec58 JB |
228 | /* return false if no more work */ |
229 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
230 | { | |
231 | struct cfg80211_scan_request *req = local->scan_req; | |
232 | enum ieee80211_band band; | |
233 | int i, ielen, n_chans; | |
234 | ||
235 | do { | |
236 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
237 | return false; | |
238 | ||
239 | band = local->hw_scan_band; | |
240 | n_chans = 0; | |
241 | for (i = 0; i < req->n_channels; i++) { | |
242 | if (req->channels[i]->band == band) { | |
243 | local->hw_scan_req->channels[n_chans] = | |
244 | req->channels[i]; | |
245 | n_chans++; | |
246 | } | |
247 | } | |
248 | ||
249 | local->hw_scan_band++; | |
250 | } while (!n_chans); | |
251 | ||
252 | local->hw_scan_req->n_channels = n_chans; | |
253 | ||
254 | ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, | |
651b5225 JM |
255 | req->ie, req->ie_len, band, (u32) -1, |
256 | 0); | |
4d36ec58 JB |
257 | local->hw_scan_req->ie_len = ielen; |
258 | ||
259 | return true; | |
260 | } | |
261 | ||
d07bfd8b | 262 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, |
e229f844 | 263 | bool was_hw_scan) |
0a51b27e JB |
264 | { |
265 | struct ieee80211_local *local = hw_to_local(hw); | |
d07bfd8b JB |
266 | bool on_oper_chan; |
267 | bool enable_beacons = false; | |
0a51b27e | 268 | |
e229f844 | 269 | lockdep_assert_held(&local->mtx); |
5bc75728 | 270 | |
6d3560d4 JB |
271 | /* |
272 | * It's ok to abort a not-yet-running scan (that | |
273 | * we have one at all will be verified by checking | |
274 | * local->scan_req next), but not to complete it | |
275 | * successfully. | |
276 | */ | |
277 | if (WARN_ON(!local->scanning && !aborted)) | |
278 | aborted = true; | |
5bc75728 | 279 | |
e229f844 | 280 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 281 | return; |
de95a54b | 282 | |
4d36ec58 | 283 | if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { |
6eb11a9a SG |
284 | int rc = drv_hw_scan(local, local->scan_sdata, local->hw_scan_req); |
285 | if (rc == 0) | |
d07bfd8b | 286 | return; |
4d36ec58 JB |
287 | } |
288 | ||
289 | kfree(local->hw_scan_req); | |
290 | local->hw_scan_req = NULL; | |
f3b85252 | 291 | |
5ba63533 | 292 | if (local->scan_req != local->int_scan_req) |
2a519311 JB |
293 | cfg80211_scan_done(local->scan_req, aborted); |
294 | local->scan_req = NULL; | |
15db0b7f | 295 | local->scan_sdata = NULL; |
2a519311 | 296 | |
fbe9c429 | 297 | local->scanning = 0; |
58905ca5 | 298 | local->scan_channel = NULL; |
f3b85252 | 299 | |
b23b025f BG |
300 | on_oper_chan = ieee80211_cfg_on_oper_channel(local); |
301 | ||
d07bfd8b | 302 | if (was_hw_scan || !on_oper_chan) |
b23b025f | 303 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); |
d07bfd8b | 304 | else |
59bdf3b0 BG |
305 | /* Set power back to normal operating levels. */ |
306 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 307 | |
e229f844 | 308 | if (!was_hw_scan) { |
b23b025f | 309 | bool on_oper_chan2; |
e229f844 SG |
310 | ieee80211_configure_filter(local); |
311 | drv_sw_scan_complete(local); | |
b23b025f BG |
312 | on_oper_chan2 = ieee80211_cfg_on_oper_channel(local); |
313 | /* We should always be on-channel at this point. */ | |
314 | WARN_ON(!on_oper_chan2); | |
315 | if (on_oper_chan2 && (on_oper_chan != on_oper_chan2)) | |
316 | enable_beacons = true; | |
317 | ||
318 | ieee80211_offchannel_return(local, enable_beacons, true); | |
e229f844 | 319 | } |
0a51b27e | 320 | |
5cff20e6 | 321 | ieee80211_recalc_idle(local); |
e229f844 | 322 | |
0a51b27e | 323 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 324 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 325 | ieee80211_mesh_notify_scan_completed(local); |
81ac3462 | 326 | ieee80211_queue_work(&local->hw, &local->work_work); |
0a51b27e | 327 | } |
8789d459 JB |
328 | |
329 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
330 | { | |
331 | struct ieee80211_local *local = hw_to_local(hw); | |
332 | ||
333 | trace_api_scan_completed(local, aborted); | |
334 | ||
335 | set_bit(SCAN_COMPLETED, &local->scanning); | |
336 | if (aborted) | |
337 | set_bit(SCAN_ABORTED, &local->scanning); | |
338 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
339 | } | |
0a51b27e JB |
340 | EXPORT_SYMBOL(ieee80211_scan_completed); |
341 | ||
f3b85252 JB |
342 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
343 | { | |
f3b85252 JB |
344 | /* |
345 | * Hardware/driver doesn't support hw_scan, so use software | |
346 | * scanning instead. First send a nullfunc frame with power save | |
347 | * bit on so that AP will buffer the frames for us while we are not | |
348 | * listening, then send probe requests to each channel and wait for | |
349 | * the responses. After all channels are scanned, tune back to the | |
350 | * original channel and send a nullfunc frame with power save bit | |
351 | * off to trigger the AP to send us all the buffered frames. | |
352 | * | |
353 | * Note that while local->sw_scanning is true everything else but | |
354 | * nullfunc frames and probe requests will be dropped in | |
355 | * ieee80211_tx_h_check_assoc(). | |
356 | */ | |
24487981 | 357 | drv_sw_scan_start(local); |
f3b85252 | 358 | |
df13cce5 | 359 | local->leave_oper_channel_time = 0; |
977923b0 | 360 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
361 | local->scan_channel_idx = 0; |
362 | ||
b23b025f BG |
363 | /* We always want to use off-channel PS, even if we |
364 | * are not really leaving oper-channel. Don't | |
365 | * tell the AP though, as long as we are on-channel. | |
366 | */ | |
367 | ieee80211_offchannel_enable_all_ps(local, false); | |
a80f7c0b | 368 | |
3ac64bee | 369 | ieee80211_configure_filter(local); |
f3b85252 | 370 | |
59bdf3b0 BG |
371 | /* We need to set power level at maximum rate for scanning. */ |
372 | ieee80211_hw_config(local, 0); | |
373 | ||
42935eca LR |
374 | ieee80211_queue_delayed_work(&local->hw, |
375 | &local->scan_work, | |
376 | IEEE80211_CHANNEL_TIME); | |
f3b85252 JB |
377 | |
378 | return 0; | |
379 | } | |
380 | ||
381 | ||
382 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, | |
383 | struct cfg80211_scan_request *req) | |
384 | { | |
385 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
386 | int rc; |
387 | ||
e229f844 SG |
388 | lockdep_assert_held(&local->mtx); |
389 | ||
f3b85252 JB |
390 | if (local->scan_req) |
391 | return -EBUSY; | |
392 | ||
6e7e6213 JL |
393 | if (!list_empty(&local->work_list)) { |
394 | /* wait for the work to finish/time out */ | |
c0ce77b8 JB |
395 | local->scan_req = req; |
396 | local->scan_sdata = sdata; | |
397 | return 0; | |
398 | } | |
399 | ||
f3b85252 JB |
400 | if (local->ops->hw_scan) { |
401 | u8 *ies; | |
f3b85252 | 402 | |
4d36ec58 JB |
403 | local->hw_scan_req = kmalloc( |
404 | sizeof(*local->hw_scan_req) + | |
405 | req->n_channels * sizeof(req->channels[0]) + | |
406 | 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + | |
407 | req->ie_len, GFP_KERNEL); | |
408 | if (!local->hw_scan_req) | |
f3b85252 JB |
409 | return -ENOMEM; |
410 | ||
4d36ec58 JB |
411 | local->hw_scan_req->ssids = req->ssids; |
412 | local->hw_scan_req->n_ssids = req->n_ssids; | |
413 | ies = (u8 *)local->hw_scan_req + | |
414 | sizeof(*local->hw_scan_req) + | |
415 | req->n_channels * sizeof(req->channels[0]); | |
416 | local->hw_scan_req->ie = ies; | |
417 | ||
418 | local->hw_scan_band = 0; | |
6e7e6213 JL |
419 | |
420 | /* | |
421 | * After allocating local->hw_scan_req, we must | |
422 | * go through until ieee80211_prep_hw_scan(), so | |
423 | * anything that might be changed here and leave | |
424 | * this function early must not go after this | |
425 | * allocation. | |
426 | */ | |
f3b85252 JB |
427 | } |
428 | ||
429 | local->scan_req = req; | |
430 | local->scan_sdata = sdata; | |
431 | ||
f3b85252 | 432 | if (local->ops->hw_scan) |
fbe9c429 | 433 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
f3b85252 | 434 | else |
fbe9c429 | 435 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
6e7e6213 | 436 | |
5cff20e6 | 437 | ieee80211_recalc_idle(local); |
f3b85252 | 438 | |
4d36ec58 JB |
439 | if (local->ops->hw_scan) { |
440 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 441 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
4d36ec58 | 442 | } else |
f3b85252 JB |
443 | rc = ieee80211_start_sw_scan(local); |
444 | ||
f3b85252 | 445 | if (rc) { |
4d36ec58 JB |
446 | kfree(local->hw_scan_req); |
447 | local->hw_scan_req = NULL; | |
fbe9c429 | 448 | local->scanning = 0; |
f3b85252 | 449 | |
5cff20e6 JB |
450 | ieee80211_recalc_idle(local); |
451 | ||
f3b85252 JB |
452 | local->scan_req = NULL; |
453 | local->scan_sdata = NULL; | |
454 | } | |
455 | ||
456 | return rc; | |
457 | } | |
458 | ||
df13cce5 HS |
459 | static unsigned long |
460 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
461 | { | |
462 | /* | |
463 | * TODO: channel switching also consumes quite some time, | |
464 | * add that delay as well to get a better estimation | |
465 | */ | |
466 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) | |
467 | return IEEE80211_PASSIVE_CHANNEL_TIME; | |
468 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
469 | } | |
470 | ||
e229f844 SG |
471 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
472 | unsigned long *next_delay) | |
7d3be3cc | 473 | { |
142b9f50 | 474 | bool associated = false; |
df13cce5 HS |
475 | bool tx_empty = true; |
476 | bool bad_latency; | |
477 | bool listen_int_exceeded; | |
478 | unsigned long min_beacon_int = 0; | |
142b9f50 | 479 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 480 | struct ieee80211_channel *next_chan; |
142b9f50 | 481 | |
df13cce5 HS |
482 | /* |
483 | * check if at least one STA interface is associated, | |
484 | * check if at least one STA interface has pending tx frames | |
485 | * and grab the lowest used beacon interval | |
486 | */ | |
142b9f50 HS |
487 | mutex_lock(&local->iflist_mtx); |
488 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 489 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
490 | continue; |
491 | ||
492 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
493 | if (sdata->u.mgd.associated) { | |
494 | associated = true; | |
df13cce5 HS |
495 | |
496 | if (sdata->vif.bss_conf.beacon_int < | |
497 | min_beacon_int || min_beacon_int == 0) | |
498 | min_beacon_int = | |
499 | sdata->vif.bss_conf.beacon_int; | |
500 | ||
501 | if (!qdisc_all_tx_empty(sdata->dev)) { | |
502 | tx_empty = false; | |
503 | break; | |
504 | } | |
142b9f50 HS |
505 | } |
506 | } | |
507 | } | |
508 | mutex_unlock(&local->iflist_mtx); | |
509 | ||
b23b025f BG |
510 | next_chan = local->scan_req->channels[local->scan_channel_idx]; |
511 | ||
512 | if (ieee80211_cfg_on_oper_channel(local)) { | |
513 | /* We're currently on operating channel. */ | |
4f2e9d91 | 514 | if (next_chan == local->oper_channel) |
b23b025f BG |
515 | /* We don't need to move off of operating channel. */ |
516 | local->next_scan_state = SCAN_SET_CHANNEL; | |
517 | else | |
518 | /* | |
519 | * We do need to leave operating channel, as next | |
520 | * scan is somewhere else. | |
521 | */ | |
522 | local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL; | |
523 | } else { | |
142b9f50 HS |
524 | /* |
525 | * we're currently scanning a different channel, let's | |
df13cce5 HS |
526 | * see if we can scan another channel without interfering |
527 | * with the current traffic situation. | |
528 | * | |
529 | * Since we don't know if the AP has pending frames for us | |
530 | * we can only check for our tx queues and use the current | |
531 | * pm_qos requirements for rx. Hence, if no tx traffic occurs | |
532 | * at all we will scan as many channels in a row as the pm_qos | |
533 | * latency allows us to. Additionally we also check for the | |
534 | * currently negotiated listen interval to prevent losing | |
535 | * frames unnecessarily. | |
536 | * | |
537 | * Otherwise switch back to the operating channel. | |
142b9f50 | 538 | */ |
df13cce5 HS |
539 | |
540 | bad_latency = time_after(jiffies + | |
541 | ieee80211_scan_get_channel_time(next_chan), | |
542 | local->leave_oper_channel_time + | |
f8965467 | 543 | usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY))); |
df13cce5 HS |
544 | |
545 | listen_int_exceeded = time_after(jiffies + | |
546 | ieee80211_scan_get_channel_time(next_chan), | |
547 | local->leave_oper_channel_time + | |
548 | usecs_to_jiffies(min_beacon_int * 1024) * | |
549 | local->hw.conf.listen_interval); | |
550 | ||
551 | if (associated && ( !tx_empty || bad_latency || | |
552 | listen_int_exceeded)) | |
977923b0 | 553 | local->next_scan_state = SCAN_ENTER_OPER_CHANNEL; |
142b9f50 | 554 | else |
977923b0 | 555 | local->next_scan_state = SCAN_SET_CHANNEL; |
142b9f50 HS |
556 | } |
557 | ||
2fb3f028 | 558 | *next_delay = 0; |
2fb3f028 HS |
559 | } |
560 | ||
142b9f50 HS |
561 | static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local, |
562 | unsigned long *next_delay) | |
563 | { | |
b23b025f BG |
564 | /* PS will already be in off-channel mode, |
565 | * we do that once at the beginning of scanning. | |
566 | */ | |
567 | ieee80211_offchannel_stop_vifs(local, false); | |
142b9f50 | 568 | |
a80f7c0b JB |
569 | /* |
570 | * What if the nullfunc frames didn't arrive? | |
571 | */ | |
572 | drv_flush(local, false); | |
573 | if (local->ops->flush) | |
574 | *next_delay = 0; | |
575 | else | |
576 | *next_delay = HZ / 10; | |
577 | ||
df13cce5 HS |
578 | /* remember when we left the operating channel */ |
579 | local->leave_oper_channel_time = jiffies; | |
580 | ||
142b9f50 | 581 | /* advance to the next channel to be scanned */ |
977923b0 | 582 | local->next_scan_state = SCAN_SET_CHANNEL; |
142b9f50 HS |
583 | } |
584 | ||
585 | static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local, | |
586 | unsigned long *next_delay) | |
587 | { | |
142b9f50 HS |
588 | /* switch back to the operating channel */ |
589 | local->scan_channel = NULL; | |
b23b025f BG |
590 | if (!ieee80211_cfg_on_oper_channel(local)) |
591 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
142b9f50 HS |
592 | |
593 | /* | |
b23b025f BG |
594 | * Re-enable vifs and beaconing. Leave PS |
595 | * in off-channel state..will put that back | |
596 | * on-channel at the end of scanning. | |
142b9f50 | 597 | */ |
b23b025f | 598 | ieee80211_offchannel_return(local, true, false); |
142b9f50 HS |
599 | |
600 | *next_delay = HZ / 5; | |
977923b0 | 601 | local->next_scan_state = SCAN_DECISION; |
142b9f50 HS |
602 | } |
603 | ||
2fb3f028 HS |
604 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
605 | unsigned long *next_delay) | |
606 | { | |
607 | int skip; | |
608 | struct ieee80211_channel *chan; | |
2fb3f028 | 609 | |
7d3be3cc HS |
610 | skip = 0; |
611 | chan = local->scan_req->channels[local->scan_channel_idx]; | |
612 | ||
584991dc | 613 | local->scan_channel = chan; |
b23b025f BG |
614 | |
615 | /* Only call hw-config if we really need to change channels. */ | |
4f2e9d91 | 616 | if (chan != local->hw.conf.channel) |
b23b025f BG |
617 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
618 | skip = 1; | |
7d3be3cc | 619 | |
7d3be3cc HS |
620 | /* advance state machine to next channel/band */ |
621 | local->scan_channel_idx++; | |
622 | ||
0ee9c13c HS |
623 | if (skip) { |
624 | /* if we skip this channel return to the decision state */ | |
625 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 626 | return; |
0ee9c13c | 627 | } |
7d3be3cc HS |
628 | |
629 | /* | |
630 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
631 | * (which unfortunately doesn't say _why_ step a) is done, | |
632 | * but it waits for the probe delay or until a frame is | |
633 | * received - and the received frame would update the NAV). | |
634 | * For now, we do not support waiting until a frame is | |
635 | * received. | |
636 | * | |
637 | * In any case, it is not necessary for a passive scan. | |
638 | */ | |
639 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || | |
640 | !local->scan_req->n_ssids) { | |
641 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
977923b0 | 642 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 643 | return; |
7d3be3cc HS |
644 | } |
645 | ||
2fb3f028 | 646 | /* active scan, send probes */ |
7d3be3cc | 647 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 648 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
649 | } |
650 | ||
651 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, | |
652 | unsigned long *next_delay) | |
653 | { | |
654 | int i; | |
655 | struct ieee80211_sub_if_data *sdata = local->scan_sdata; | |
656 | ||
657 | for (i = 0; i < local->scan_req->n_ssids; i++) | |
658 | ieee80211_send_probe_req( | |
659 | sdata, NULL, | |
660 | local->scan_req->ssids[i].ssid, | |
661 | local->scan_req->ssids[i].ssid_len, | |
662 | local->scan_req->ie, local->scan_req->ie_len); | |
663 | ||
664 | /* | |
665 | * After sending probe requests, wait for probe responses | |
666 | * on the channel. | |
667 | */ | |
668 | *next_delay = IEEE80211_CHANNEL_TIME; | |
977923b0 | 669 | local->next_scan_state = SCAN_DECISION; |
7d3be3cc HS |
670 | } |
671 | ||
c2b13452 | 672 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
673 | { |
674 | struct ieee80211_local *local = | |
675 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 676 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 677 | unsigned long next_delay = 0; |
d07bfd8b | 678 | bool aborted, hw_scan; |
0a51b27e | 679 | |
259b62e3 | 680 | mutex_lock(&local->mtx); |
8789d459 | 681 | |
d07bfd8b JB |
682 | sdata = local->scan_sdata; |
683 | ||
259b62e3 | 684 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 685 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 686 | goto out_complete; |
8789d459 JB |
687 | } |
688 | ||
259b62e3 SG |
689 | if (!sdata || !local->scan_req) |
690 | goto out; | |
f3b85252 | 691 | |
fbe9c429 | 692 | if (local->scan_req && !local->scanning) { |
f3b85252 JB |
693 | struct cfg80211_scan_request *req = local->scan_req; |
694 | int rc; | |
695 | ||
696 | local->scan_req = NULL; | |
15db0b7f | 697 | local->scan_sdata = NULL; |
f3b85252 JB |
698 | |
699 | rc = __ieee80211_start_scan(sdata, req); | |
259b62e3 | 700 | if (rc) { |
3aed49ef SG |
701 | /* need to complete scan in cfg80211 */ |
702 | local->scan_req = req; | |
259b62e3 SG |
703 | aborted = true; |
704 | goto out_complete; | |
705 | } else | |
706 | goto out; | |
f3b85252 JB |
707 | } |
708 | ||
5bc75728 JB |
709 | /* |
710 | * Avoid re-scheduling when the sdata is going away. | |
711 | */ | |
9607e6b6 | 712 | if (!ieee80211_sdata_running(sdata)) { |
259b62e3 SG |
713 | aborted = true; |
714 | goto out_complete; | |
f3b85252 | 715 | } |
0a51b27e | 716 | |
f502d09b HS |
717 | /* |
718 | * as long as no delay is required advance immediately | |
719 | * without scheduling a new work | |
720 | */ | |
721 | do { | |
977923b0 | 722 | switch (local->next_scan_state) { |
2fb3f028 | 723 | case SCAN_DECISION: |
e229f844 SG |
724 | /* if no more bands/channels left, complete scan */ |
725 | if (local->scan_channel_idx >= local->scan_req->n_channels) { | |
726 | aborted = false; | |
727 | goto out_complete; | |
728 | } | |
729 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 730 | break; |
2fb3f028 HS |
731 | case SCAN_SET_CHANNEL: |
732 | ieee80211_scan_state_set_channel(local, &next_delay); | |
733 | break; | |
f502d09b HS |
734 | case SCAN_SEND_PROBE: |
735 | ieee80211_scan_state_send_probe(local, &next_delay); | |
736 | break; | |
142b9f50 HS |
737 | case SCAN_LEAVE_OPER_CHANNEL: |
738 | ieee80211_scan_state_leave_oper_channel(local, &next_delay); | |
739 | break; | |
740 | case SCAN_ENTER_OPER_CHANNEL: | |
741 | ieee80211_scan_state_enter_oper_channel(local, &next_delay); | |
742 | break; | |
f502d09b HS |
743 | } |
744 | } while (next_delay == 0); | |
0a51b27e | 745 | |
42935eca | 746 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 747 | goto out; |
259b62e3 SG |
748 | |
749 | out_complete: | |
e229f844 | 750 | hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
d07bfd8b | 751 | __ieee80211_scan_completed(&local->hw, aborted, hw_scan); |
259b62e3 SG |
752 | out: |
753 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
754 | } |
755 | ||
f3b85252 JB |
756 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
757 | struct cfg80211_scan_request *req) | |
0a51b27e | 758 | { |
f3b85252 | 759 | int res; |
de95a54b | 760 | |
a1699b75 | 761 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 762 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 763 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 764 | |
f3b85252 | 765 | return res; |
0a51b27e JB |
766 | } |
767 | ||
f3b85252 | 768 | int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, |
be4a4b6a JB |
769 | const u8 *ssid, u8 ssid_len, |
770 | struct ieee80211_channel *chan) | |
0a51b27e | 771 | { |
0a51b27e | 772 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 773 | int ret = -EBUSY; |
fb63bc41 | 774 | enum ieee80211_band band; |
2a519311 | 775 | |
a1699b75 | 776 | mutex_lock(&local->mtx); |
0a51b27e | 777 | |
f3b85252 JB |
778 | /* busy scanning */ |
779 | if (local->scan_req) | |
780 | goto unlock; | |
9116dd01 | 781 | |
be4a4b6a JB |
782 | /* fill internal scan request */ |
783 | if (!chan) { | |
784 | int i, nchan = 0; | |
785 | ||
786 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
787 | if (!local->hw.wiphy->bands[band]) | |
788 | continue; | |
789 | for (i = 0; | |
790 | i < local->hw.wiphy->bands[band]->n_channels; | |
791 | i++) { | |
792 | local->int_scan_req->channels[nchan] = | |
793 | &local->hw.wiphy->bands[band]->channels[i]; | |
794 | nchan++; | |
795 | } | |
796 | } | |
797 | ||
798 | local->int_scan_req->n_channels = nchan; | |
799 | } else { | |
800 | local->int_scan_req->channels[0] = chan; | |
801 | local->int_scan_req->n_channels = 1; | |
802 | } | |
803 | ||
804 | local->int_scan_req->ssids = &local->scan_ssid; | |
805 | local->int_scan_req->n_ssids = 1; | |
5ba63533 JB |
806 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
807 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 808 | |
5ba63533 | 809 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 810 | unlock: |
a1699b75 | 811 | mutex_unlock(&local->mtx); |
f3b85252 | 812 | return ret; |
0a51b27e | 813 | } |
5bb644a0 | 814 | |
4136c422 SG |
815 | /* |
816 | * Only call this function when a scan can't be queued -- under RTNL. | |
817 | */ | |
5bb644a0 JB |
818 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
819 | { | |
494486f8 | 820 | bool abortscan; |
5bb644a0 JB |
821 | |
822 | /* | |
4136c422 SG |
823 | * We are only canceling software scan, or deferred scan that was not |
824 | * yet really started (see __ieee80211_start_scan ). | |
825 | * | |
826 | * Regarding hardware scan: | |
827 | * - we can not call __ieee80211_scan_completed() as when | |
828 | * SCAN_HW_SCANNING bit is set this function change | |
829 | * local->hw_scan_req to operate on 5G band, what race with | |
830 | * driver which can use local->hw_scan_req | |
831 | * | |
832 | * - we can not cancel scan_work since driver can schedule it | |
833 | * by ieee80211_scan_completed(..., true) to finish scan | |
834 | * | |
835 | * Hence low lever driver is responsible for canceling HW scan. | |
5bb644a0 | 836 | */ |
4136c422 | 837 | |
a1699b75 | 838 | mutex_lock(&local->mtx); |
4136c422 | 839 | abortscan = local->scan_req && !test_bit(SCAN_HW_SCANNING, &local->scanning); |
4136c422 | 840 | if (abortscan) { |
d07bfd8b JB |
841 | /* |
842 | * The scan is canceled, but stop work from being pending. | |
843 | * | |
844 | * If the work is currently running, it must be blocked on | |
845 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
846 | * simply exit once it acquires the mutex. | |
847 | */ | |
848 | cancel_delayed_work(&local->scan_work); | |
849 | /* and clean up */ | |
850 | __ieee80211_scan_completed(&local->hw, true, false); | |
4136c422 | 851 | } |
d07bfd8b | 852 | mutex_unlock(&local->mtx); |
5bb644a0 | 853 | } |
79f460ca LC |
854 | |
855 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
856 | struct cfg80211_sched_scan_request *req) | |
857 | { | |
858 | struct ieee80211_local *local = sdata->local; | |
859 | int ret, i; | |
860 | ||
861 | mutex_lock(&sdata->local->mtx); | |
862 | ||
863 | if (local->sched_scanning) { | |
864 | ret = -EBUSY; | |
865 | goto out; | |
866 | } | |
867 | ||
868 | if (!local->ops->sched_scan_start) { | |
869 | ret = -ENOTSUPP; | |
870 | goto out; | |
871 | } | |
872 | ||
873 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
874 | local->sched_scan_ies.ie[i] = kzalloc(2 + | |
875 | IEEE80211_MAX_SSID_LEN + | |
876 | local->scan_ies_len, | |
877 | GFP_KERNEL); | |
878 | if (!local->sched_scan_ies.ie[i]) { | |
879 | ret = -ENOMEM; | |
880 | goto out_free; | |
881 | } | |
882 | ||
883 | local->sched_scan_ies.len[i] = | |
884 | ieee80211_build_preq_ies(local, | |
885 | local->sched_scan_ies.ie[i], | |
886 | req->ie, req->ie_len, i, | |
887 | (u32) -1, 0); | |
888 | } | |
889 | ||
890 | ret = drv_sched_scan_start(local, sdata, req, | |
891 | &local->sched_scan_ies); | |
892 | if (ret == 0) { | |
893 | local->sched_scanning = true; | |
894 | goto out; | |
895 | } | |
896 | ||
897 | out_free: | |
898 | while (i > 0) | |
899 | kfree(local->sched_scan_ies.ie[--i]); | |
900 | out: | |
901 | mutex_unlock(&sdata->local->mtx); | |
902 | return ret; | |
903 | } | |
904 | ||
905 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata, | |
906 | bool driver_initiated) | |
907 | { | |
908 | struct ieee80211_local *local = sdata->local; | |
909 | int ret = 0, i; | |
910 | ||
911 | mutex_lock(&sdata->local->mtx); | |
912 | ||
913 | if (!local->ops->sched_scan_stop) { | |
914 | ret = -ENOTSUPP; | |
915 | goto out; | |
916 | } | |
917 | ||
918 | if (local->sched_scanning) { | |
919 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) | |
920 | kfree(local->sched_scan_ies.ie[i]); | |
921 | ||
922 | if (!driver_initiated) | |
923 | drv_sched_scan_stop(local, sdata); | |
924 | local->sched_scanning = false; | |
925 | } | |
926 | ||
927 | out: | |
928 | mutex_unlock(&sdata->local->mtx); | |
929 | ||
930 | return ret; | |
931 | } | |
932 | ||
933 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
934 | { | |
935 | struct ieee80211_local *local = hw_to_local(hw); | |
936 | ||
937 | trace_api_sched_scan_results(local); | |
938 | ||
939 | cfg80211_sched_scan_results(hw->wiphy); | |
940 | } | |
941 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
942 | ||
943 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) | |
944 | { | |
945 | struct ieee80211_local *local = hw_to_local(hw); | |
946 | ||
947 | trace_api_sched_scan_stopped(local); | |
948 | ||
949 | cfg80211_sched_scan_stopped(hw->wiphy); | |
950 | } | |
951 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |