1 /*
2 * Driver interaction with Linux nl80211/cfg80211 - Scanning
3 * Copyright(c) 2015 Intel Deutschland GmbH
4 * Copyright (c) 2002-2014, Jouni Malinen <j@w1.fi>
5 * Copyright (c) 2007, Johannes Berg <johannes@sipsolutions.net>
6 * Copyright (c) 2009-2010, Atheros Communications
7 *
8 * This software may be distributed under the terms of the BSD license.
9 * See README for more details.
10 */
11
12 #include "includes.h"
13 #include <netlink/genl/genl.h>
14
15 #include "utils/common.h"
16 #include "utils/eloop.h"
17 #include "common/ieee802_11_defs.h"
18 #include "common/ieee802_11_common.h"
19 #include "common/qca-vendor.h"
20 #include "driver_nl80211.h"
21
22
get_noise_for_scan_results(struct nl_msg * msg,void * arg)23 static int get_noise_for_scan_results(struct nl_msg *msg, void *arg)
24 {
25 struct nlattr *tb[NL80211_ATTR_MAX + 1];
26 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
27 struct nlattr *sinfo[NL80211_SURVEY_INFO_MAX + 1];
28 static struct nla_policy survey_policy[NL80211_SURVEY_INFO_MAX + 1] = {
29 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
30 [NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 },
31 };
32 struct wpa_scan_results *scan_results = arg;
33 struct wpa_scan_res *scan_res;
34 size_t i;
35
36 nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
37 genlmsg_attrlen(gnlh, 0), NULL);
38
39 if (!tb[NL80211_ATTR_SURVEY_INFO]) {
40 wpa_printf(MSG_DEBUG, "nl80211: Survey data missing");
41 return NL_SKIP;
42 }
43
44 if (nla_parse_nested(sinfo, NL80211_SURVEY_INFO_MAX,
45 tb[NL80211_ATTR_SURVEY_INFO],
46 survey_policy)) {
47 wpa_printf(MSG_DEBUG, "nl80211: Failed to parse nested "
48 "attributes");
49 return NL_SKIP;
50 }
51
52 if (!sinfo[NL80211_SURVEY_INFO_NOISE])
53 return NL_SKIP;
54
55 if (!sinfo[NL80211_SURVEY_INFO_FREQUENCY])
56 return NL_SKIP;
57
58 for (i = 0; i < scan_results->num; ++i) {
59 scan_res = scan_results->res[i];
60 if (!scan_res)
61 continue;
62 if ((int) nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]) !=
63 scan_res->freq)
64 continue;
65 if (!(scan_res->flags & WPA_SCAN_NOISE_INVALID))
66 continue;
67 scan_res->noise = (s8)
68 nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]);
69 scan_res->flags &= ~WPA_SCAN_NOISE_INVALID;
70 }
71
72 return NL_SKIP;
73 }
74
75
nl80211_get_noise_for_scan_results(struct wpa_driver_nl80211_data * drv,struct wpa_scan_results * scan_res)76 static int nl80211_get_noise_for_scan_results(
77 struct wpa_driver_nl80211_data *drv,
78 struct wpa_scan_results *scan_res)
79 {
80 struct nl_msg *msg;
81
82 msg = nl80211_drv_msg(drv, NLM_F_DUMP, NL80211_CMD_GET_SURVEY);
83 return send_and_recv_msgs(drv, msg, get_noise_for_scan_results,
84 scan_res);
85 }
86
87
88 /**
89 * wpa_driver_nl80211_scan_timeout - Scan timeout to report scan completion
90 * @eloop_ctx: Driver private data
91 * @timeout_ctx: ctx argument given to wpa_driver_nl80211_init()
92 *
93 * This function can be used as registered timeout when starting a scan to
94 * generate a scan completed event if the driver does not report this.
95 */
wpa_driver_nl80211_scan_timeout(void * eloop_ctx,void * timeout_ctx)96 void wpa_driver_nl80211_scan_timeout(void *eloop_ctx, void *timeout_ctx)
97 {
98 struct wpa_driver_nl80211_data *drv = eloop_ctx;
99
100 wpa_printf(MSG_DEBUG, "nl80211: Scan timeout - try to abort it");
101 if (!wpa_driver_nl80211_abort_scan(drv->first_bss))
102 return;
103
104 wpa_printf(MSG_DEBUG, "nl80211: Failed to abort scan");
105
106 if (drv->ap_scan_as_station != NL80211_IFTYPE_UNSPECIFIED) {
107 wpa_driver_nl80211_set_mode(drv->first_bss,
108 drv->ap_scan_as_station);
109 drv->ap_scan_as_station = NL80211_IFTYPE_UNSPECIFIED;
110 }
111
112 wpa_printf(MSG_DEBUG, "nl80211: Try to get scan results");
113 wpa_supplicant_event(timeout_ctx, EVENT_SCAN_RESULTS, NULL);
114 }
115
116
117 static struct nl_msg *
nl80211_scan_common(struct i802_bss * bss,u8 cmd,struct wpa_driver_scan_params * params)118 nl80211_scan_common(struct i802_bss *bss, u8 cmd,
119 struct wpa_driver_scan_params *params)
120 {
121 struct wpa_driver_nl80211_data *drv = bss->drv;
122 struct nl_msg *msg;
123 size_t i;
124 u32 scan_flags = 0;
125
126 msg = nl80211_cmd_msg(bss, 0, cmd);
127 if (!msg)
128 return NULL;
129
130 if (params->num_ssids) {
131 struct nlattr *ssids;
132
133 ssids = nla_nest_start(msg, NL80211_ATTR_SCAN_SSIDS);
134 if (ssids == NULL)
135 goto fail;
136 for (i = 0; i < params->num_ssids; i++) {
137 wpa_hexdump_ascii(MSG_MSGDUMP, "nl80211: Scan SSID",
138 params->ssids[i].ssid,
139 params->ssids[i].ssid_len);
140 if (nla_put(msg, i + 1, params->ssids[i].ssid_len,
141 params->ssids[i].ssid))
142 goto fail;
143 }
144 nla_nest_end(msg, ssids);
145 } else {
146 wpa_printf(MSG_DEBUG, "nl80211: Passive scan requested");
147 }
148
149 if (params->extra_ies) {
150 wpa_hexdump(MSG_MSGDUMP, "nl80211: Scan extra IEs",
151 params->extra_ies, params->extra_ies_len);
152 if (nla_put(msg, NL80211_ATTR_IE, params->extra_ies_len,
153 params->extra_ies))
154 goto fail;
155 }
156
157 if (params->freqs) {
158 struct nlattr *freqs;
159 freqs = nla_nest_start(msg, NL80211_ATTR_SCAN_FREQUENCIES);
160 if (freqs == NULL)
161 goto fail;
162 for (i = 0; params->freqs[i]; i++) {
163 wpa_printf(MSG_MSGDUMP, "nl80211: Scan frequency %u "
164 "MHz", params->freqs[i]);
165 if (nla_put_u32(msg, i + 1, params->freqs[i]))
166 goto fail;
167 }
168 nla_nest_end(msg, freqs);
169 }
170
171 os_free(drv->filter_ssids);
172 drv->filter_ssids = params->filter_ssids;
173 params->filter_ssids = NULL;
174 drv->num_filter_ssids = params->num_filter_ssids;
175
176 if (params->only_new_results) {
177 wpa_printf(MSG_DEBUG, "nl80211: Add NL80211_SCAN_FLAG_FLUSH");
178 scan_flags |= NL80211_SCAN_FLAG_FLUSH;
179 }
180
181 if (params->low_priority && drv->have_low_prio_scan) {
182 wpa_printf(MSG_DEBUG,
183 "nl80211: Add NL80211_SCAN_FLAG_LOW_PRIORITY");
184 scan_flags |= NL80211_SCAN_FLAG_LOW_PRIORITY;
185 }
186
187 if (params->mac_addr_rand) {
188 wpa_printf(MSG_DEBUG,
189 "nl80211: Add NL80211_SCAN_FLAG_RANDOM_ADDR");
190 scan_flags |= NL80211_SCAN_FLAG_RANDOM_ADDR;
191
192 if (params->mac_addr) {
193 wpa_printf(MSG_DEBUG, "nl80211: MAC address: " MACSTR,
194 MAC2STR(params->mac_addr));
195 if (nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN,
196 params->mac_addr))
197 goto fail;
198 }
199
200 if (params->mac_addr_mask) {
201 wpa_printf(MSG_DEBUG, "nl80211: MAC address mask: "
202 MACSTR, MAC2STR(params->mac_addr_mask));
203 if (nla_put(msg, NL80211_ATTR_MAC_MASK, ETH_ALEN,
204 params->mac_addr_mask))
205 goto fail;
206 }
207 }
208
209 if (scan_flags &&
210 nla_put_u32(msg, NL80211_ATTR_SCAN_FLAGS, scan_flags))
211 goto fail;
212
213 return msg;
214
215 fail:
216 nlmsg_free(msg);
217 return NULL;
218 }
219
220
221 /**
222 * wpa_driver_nl80211_scan - Request the driver to initiate scan
223 * @bss: Pointer to private driver data from wpa_driver_nl80211_init()
224 * @params: Scan parameters
225 * Returns: 0 on success, -1 on failure
226 */
wpa_driver_nl80211_scan(struct i802_bss * bss,struct wpa_driver_scan_params * params)227 int wpa_driver_nl80211_scan(struct i802_bss *bss,
228 struct wpa_driver_scan_params *params)
229 {
230 struct wpa_driver_nl80211_data *drv = bss->drv;
231 int ret = -1, timeout;
232 struct nl_msg *msg = NULL;
233
234 wpa_dbg(drv->ctx, MSG_DEBUG, "nl80211: scan request");
235 drv->scan_for_auth = 0;
236
237 if (TEST_FAIL())
238 return -1;
239
240 msg = nl80211_scan_common(bss, NL80211_CMD_TRIGGER_SCAN, params);
241 if (!msg)
242 return -1;
243
244 if (params->p2p_probe) {
245 struct nlattr *rates;
246
247 wpa_printf(MSG_DEBUG, "nl80211: P2P probe - mask SuppRates");
248
249 rates = nla_nest_start(msg, NL80211_ATTR_SCAN_SUPP_RATES);
250 if (rates == NULL)
251 goto fail;
252
253 /*
254 * Remove 2.4 GHz rates 1, 2, 5.5, 11 Mbps from supported rates
255 * by masking out everything else apart from the OFDM rates 6,
256 * 9, 12, 18, 24, 36, 48, 54 Mbps from non-MCS rates. All 5 GHz
257 * rates are left enabled.
258 */
259 if (nla_put(msg, NL80211_BAND_2GHZ, 8,
260 "\x0c\x12\x18\x24\x30\x48\x60\x6c"))
261 goto fail;
262 nla_nest_end(msg, rates);
263
264 if (nla_put_flag(msg, NL80211_ATTR_TX_NO_CCK_RATE))
265 goto fail;
266 }
267
268 if (params->bssid) {
269 wpa_printf(MSG_DEBUG, "nl80211: Scan for a specific BSSID: "
270 MACSTR, MAC2STR(params->bssid));
271 if (nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, params->bssid))
272 goto fail;
273 }
274
275 ret = send_and_recv_msgs(drv, msg, NULL, NULL);
276 msg = NULL;
277 if (ret) {
278 wpa_printf(MSG_DEBUG, "nl80211: Scan trigger failed: ret=%d "
279 "(%s)", ret, strerror(-ret));
280 if (drv->hostapd && is_ap_interface(drv->nlmode)) {
281 enum nl80211_iftype old_mode = drv->nlmode;
282
283 /*
284 * mac80211 does not allow scan requests in AP mode, so
285 * try to do this in station mode.
286 */
287 if (wpa_driver_nl80211_set_mode(
288 bss, NL80211_IFTYPE_STATION))
289 goto fail;
290
291 if (wpa_driver_nl80211_scan(bss, params)) {
292 wpa_driver_nl80211_set_mode(bss, old_mode);
293 goto fail;
294 }
295
296 /* Restore AP mode when processing scan results */
297 drv->ap_scan_as_station = old_mode;
298 ret = 0;
299 } else
300 goto fail;
301 }
302
303 drv->scan_state = SCAN_REQUESTED;
304 /* Not all drivers generate "scan completed" wireless event, so try to
305 * read results after a timeout. */
306 timeout = 10;
307 if (drv->scan_complete_events) {
308 /*
309 * The driver seems to deliver events to notify when scan is
310 * complete, so use longer timeout to avoid race conditions
311 * with scanning and following association request.
312 */
313 timeout = 30;
314 }
315 wpa_printf(MSG_DEBUG, "Scan requested (ret=%d) - scan timeout %d "
316 "seconds", ret, timeout);
317 eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv, drv->ctx);
318 eloop_register_timeout(timeout, 0, wpa_driver_nl80211_scan_timeout,
319 drv, drv->ctx);
320 drv->last_scan_cmd = NL80211_CMD_TRIGGER_SCAN;
321
322 fail:
323 nlmsg_free(msg);
324 return ret;
325 }
326
327
328 static int
nl80211_sched_scan_add_scan_plans(struct wpa_driver_nl80211_data * drv,struct nl_msg * msg,struct wpa_driver_scan_params * params)329 nl80211_sched_scan_add_scan_plans(struct wpa_driver_nl80211_data *drv,
330 struct nl_msg *msg,
331 struct wpa_driver_scan_params *params)
332 {
333 struct nlattr *plans;
334 struct sched_scan_plan *scan_plans = params->sched_scan_plans;
335 unsigned int i;
336
337 plans = nla_nest_start(msg, NL80211_ATTR_SCHED_SCAN_PLANS);
338 if (!plans)
339 return -1;
340
341 for (i = 0; i < params->sched_scan_plans_num; i++) {
342 struct nlattr *plan = nla_nest_start(msg, i + 1);
343
344 if (!plan)
345 return -1;
346
347 if (!scan_plans[i].interval ||
348 scan_plans[i].interval >
349 drv->capa.max_sched_scan_plan_interval) {
350 wpa_printf(MSG_DEBUG,
351 "nl80211: sched scan plan no. %u: Invalid interval: %u",
352 i, scan_plans[i].interval);
353 return -1;
354 }
355
356 if (nla_put_u32(msg, NL80211_SCHED_SCAN_PLAN_INTERVAL,
357 scan_plans[i].interval))
358 return -1;
359
360 if (scan_plans[i].iterations >
361 drv->capa.max_sched_scan_plan_iterations) {
362 wpa_printf(MSG_DEBUG,
363 "nl80211: sched scan plan no. %u: Invalid number of iterations: %u",
364 i, scan_plans[i].iterations);
365 return -1;
366 }
367
368 if (scan_plans[i].iterations &&
369 nla_put_u32(msg, NL80211_SCHED_SCAN_PLAN_ITERATIONS,
370 scan_plans[i].iterations))
371 return -1;
372
373 nla_nest_end(msg, plan);
374
375 /*
376 * All the scan plans must specify the number of iterations
377 * except the last plan, which will run infinitely. So if the
378 * number of iterations is not specified, this ought to be the
379 * last scan plan.
380 */
381 if (!scan_plans[i].iterations)
382 break;
383 }
384
385 if (i != params->sched_scan_plans_num - 1) {
386 wpa_printf(MSG_DEBUG,
387 "nl80211: All sched scan plans but the last must specify number of iterations");
388 return -1;
389 }
390
391 nla_nest_end(msg, plans);
392 return 0;
393 }
394
395
396 /**
397 * wpa_driver_nl80211_sched_scan - Initiate a scheduled scan
398 * @priv: Pointer to private driver data from wpa_driver_nl80211_init()
399 * @params: Scan parameters
400 * Returns: 0 on success, -1 on failure or if not supported
401 */
wpa_driver_nl80211_sched_scan(void * priv,struct wpa_driver_scan_params * params)402 int wpa_driver_nl80211_sched_scan(void *priv,
403 struct wpa_driver_scan_params *params)
404 {
405 struct i802_bss *bss = priv;
406 struct wpa_driver_nl80211_data *drv = bss->drv;
407 int ret = -1;
408 struct nl_msg *msg;
409 size_t i;
410
411 wpa_dbg(drv->ctx, MSG_DEBUG, "nl80211: sched_scan request");
412
413 #ifdef ANDROID
414 if (!drv->capa.sched_scan_supported)
415 return android_pno_start(bss, params);
416 #endif /* ANDROID */
417
418 if (!params->sched_scan_plans_num ||
419 params->sched_scan_plans_num > drv->capa.max_sched_scan_plans) {
420 wpa_printf(MSG_ERROR,
421 "nl80211: Invalid number of sched scan plans: %u",
422 params->sched_scan_plans_num);
423 return -1;
424 }
425
426 msg = nl80211_scan_common(bss, NL80211_CMD_START_SCHED_SCAN, params);
427 if (!msg)
428 goto fail;
429
430 if (drv->capa.max_sched_scan_plan_iterations) {
431 if (nl80211_sched_scan_add_scan_plans(drv, msg, params))
432 goto fail;
433 } else {
434 if (nla_put_u32(msg, NL80211_ATTR_SCHED_SCAN_INTERVAL,
435 params->sched_scan_plans[0].interval * 1000))
436 goto fail;
437 }
438
439 if ((drv->num_filter_ssids &&
440 (int) drv->num_filter_ssids <= drv->capa.max_match_sets) ||
441 params->filter_rssi) {
442 struct nlattr *match_sets;
443 match_sets = nla_nest_start(msg, NL80211_ATTR_SCHED_SCAN_MATCH);
444 if (match_sets == NULL)
445 goto fail;
446
447 for (i = 0; i < drv->num_filter_ssids; i++) {
448 struct nlattr *match_set_ssid;
449 wpa_hexdump_ascii(MSG_MSGDUMP,
450 "nl80211: Sched scan filter SSID",
451 drv->filter_ssids[i].ssid,
452 drv->filter_ssids[i].ssid_len);
453
454 match_set_ssid = nla_nest_start(msg, i + 1);
455 if (match_set_ssid == NULL ||
456 nla_put(msg, NL80211_ATTR_SCHED_SCAN_MATCH_SSID,
457 drv->filter_ssids[i].ssid_len,
458 drv->filter_ssids[i].ssid) ||
459 (params->filter_rssi &&
460 nla_put_u32(msg,
461 NL80211_SCHED_SCAN_MATCH_ATTR_RSSI,
462 params->filter_rssi)))
463 goto fail;
464
465 nla_nest_end(msg, match_set_ssid);
466 }
467
468 /*
469 * Due to backward compatibility code, newer kernels treat this
470 * matchset (with only an RSSI filter) as the default for all
471 * other matchsets, unless it's the only one, in which case the
472 * matchset will actually allow all SSIDs above the RSSI.
473 */
474 if (params->filter_rssi) {
475 struct nlattr *match_set_rssi;
476 match_set_rssi = nla_nest_start(msg, 0);
477 if (match_set_rssi == NULL ||
478 nla_put_u32(msg, NL80211_SCHED_SCAN_MATCH_ATTR_RSSI,
479 params->filter_rssi))
480 goto fail;
481 wpa_printf(MSG_MSGDUMP,
482 "nl80211: Sched scan RSSI filter %d dBm",
483 params->filter_rssi);
484 nla_nest_end(msg, match_set_rssi);
485 }
486
487 nla_nest_end(msg, match_sets);
488 }
489
490 ret = send_and_recv_msgs(drv, msg, NULL, NULL);
491
492 /* TODO: if we get an error here, we should fall back to normal scan */
493
494 msg = NULL;
495 if (ret) {
496 wpa_printf(MSG_DEBUG, "nl80211: Sched scan start failed: "
497 "ret=%d (%s)", ret, strerror(-ret));
498 goto fail;
499 }
500
501 wpa_printf(MSG_DEBUG, "nl80211: Sched scan requested (ret=%d)", ret);
502
503 fail:
504 nlmsg_free(msg);
505 return ret;
506 }
507
508
509 /**
510 * wpa_driver_nl80211_stop_sched_scan - Stop a scheduled scan
511 * @priv: Pointer to private driver data from wpa_driver_nl80211_init()
512 * Returns: 0 on success, -1 on failure or if not supported
513 */
wpa_driver_nl80211_stop_sched_scan(void * priv)514 int wpa_driver_nl80211_stop_sched_scan(void *priv)
515 {
516 struct i802_bss *bss = priv;
517 struct wpa_driver_nl80211_data *drv = bss->drv;
518 int ret;
519 struct nl_msg *msg;
520
521 #ifdef ANDROID
522 if (!drv->capa.sched_scan_supported)
523 return android_pno_stop(bss);
524 #endif /* ANDROID */
525
526 msg = nl80211_drv_msg(drv, 0, NL80211_CMD_STOP_SCHED_SCAN);
527 ret = send_and_recv_msgs(drv, msg, NULL, NULL);
528 if (ret) {
529 wpa_printf(MSG_DEBUG,
530 "nl80211: Sched scan stop failed: ret=%d (%s)",
531 ret, strerror(-ret));
532 } else {
533 wpa_printf(MSG_DEBUG,
534 "nl80211: Sched scan stop sent");
535 }
536
537 return ret;
538 }
539
540
nl80211_scan_filtered(struct wpa_driver_nl80211_data * drv,const u8 * ie,size_t ie_len)541 static int nl80211_scan_filtered(struct wpa_driver_nl80211_data *drv,
542 const u8 *ie, size_t ie_len)
543 {
544 const u8 *ssid;
545 size_t i;
546
547 if (drv->filter_ssids == NULL)
548 return 0;
549
550 ssid = get_ie(ie, ie_len, WLAN_EID_SSID);
551 if (ssid == NULL)
552 return 1;
553
554 for (i = 0; i < drv->num_filter_ssids; i++) {
555 if (ssid[1] == drv->filter_ssids[i].ssid_len &&
556 os_memcmp(ssid + 2, drv->filter_ssids[i].ssid, ssid[1]) ==
557 0)
558 return 0;
559 }
560
561 return 1;
562 }
563
564
bss_info_handler(struct nl_msg * msg,void * arg)565 int bss_info_handler(struct nl_msg *msg, void *arg)
566 {
567 struct nlattr *tb[NL80211_ATTR_MAX + 1];
568 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
569 struct nlattr *bss[NL80211_BSS_MAX + 1];
570 static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
571 [NL80211_BSS_BSSID] = { .type = NLA_UNSPEC },
572 [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
573 [NL80211_BSS_TSF] = { .type = NLA_U64 },
574 [NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 },
575 [NL80211_BSS_CAPABILITY] = { .type = NLA_U16 },
576 [NL80211_BSS_INFORMATION_ELEMENTS] = { .type = NLA_UNSPEC },
577 [NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
578 [NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
579 [NL80211_BSS_STATUS] = { .type = NLA_U32 },
580 [NL80211_BSS_SEEN_MS_AGO] = { .type = NLA_U32 },
581 [NL80211_BSS_BEACON_IES] = { .type = NLA_UNSPEC },
582 };
583 struct nl80211_bss_info_arg *_arg = arg;
584 struct wpa_scan_results *res = _arg->res;
585 struct wpa_scan_res **tmp;
586 struct wpa_scan_res *r;
587 const u8 *ie, *beacon_ie;
588 size_t ie_len, beacon_ie_len;
589 u8 *pos;
590 size_t i;
591
592 nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
593 genlmsg_attrlen(gnlh, 0), NULL);
594 if (!tb[NL80211_ATTR_BSS])
595 return NL_SKIP;
596 if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
597 bss_policy))
598 return NL_SKIP;
599 if (bss[NL80211_BSS_STATUS]) {
600 enum nl80211_bss_status status;
601 status = nla_get_u32(bss[NL80211_BSS_STATUS]);
602 if (status == NL80211_BSS_STATUS_ASSOCIATED &&
603 bss[NL80211_BSS_FREQUENCY]) {
604 _arg->assoc_freq =
605 nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
606 wpa_printf(MSG_DEBUG, "nl80211: Associated on %u MHz",
607 _arg->assoc_freq);
608 }
609 if (status == NL80211_BSS_STATUS_IBSS_JOINED &&
610 bss[NL80211_BSS_FREQUENCY]) {
611 _arg->ibss_freq =
612 nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
613 wpa_printf(MSG_DEBUG, "nl80211: IBSS-joined on %u MHz",
614 _arg->ibss_freq);
615 }
616 if (status == NL80211_BSS_STATUS_ASSOCIATED &&
617 bss[NL80211_BSS_BSSID]) {
618 os_memcpy(_arg->assoc_bssid,
619 nla_data(bss[NL80211_BSS_BSSID]), ETH_ALEN);
620 wpa_printf(MSG_DEBUG, "nl80211: Associated with "
621 MACSTR, MAC2STR(_arg->assoc_bssid));
622 }
623 }
624 if (!res)
625 return NL_SKIP;
626 if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) {
627 ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
628 ie_len = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
629 } else {
630 ie = NULL;
631 ie_len = 0;
632 }
633 if (bss[NL80211_BSS_BEACON_IES]) {
634 beacon_ie = nla_data(bss[NL80211_BSS_BEACON_IES]);
635 beacon_ie_len = nla_len(bss[NL80211_BSS_BEACON_IES]);
636 } else {
637 beacon_ie = NULL;
638 beacon_ie_len = 0;
639 }
640
641 if (nl80211_scan_filtered(_arg->drv, ie ? ie : beacon_ie,
642 ie ? ie_len : beacon_ie_len))
643 return NL_SKIP;
644
645 r = os_zalloc(sizeof(*r) + ie_len + beacon_ie_len);
646 if (r == NULL)
647 return NL_SKIP;
648 if (bss[NL80211_BSS_BSSID])
649 os_memcpy(r->bssid, nla_data(bss[NL80211_BSS_BSSID]),
650 ETH_ALEN);
651 if (bss[NL80211_BSS_FREQUENCY])
652 r->freq = nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
653 if (bss[NL80211_BSS_BEACON_INTERVAL])
654 r->beacon_int = nla_get_u16(bss[NL80211_BSS_BEACON_INTERVAL]);
655 if (bss[NL80211_BSS_CAPABILITY])
656 r->caps = nla_get_u16(bss[NL80211_BSS_CAPABILITY]);
657 r->flags |= WPA_SCAN_NOISE_INVALID;
658 if (bss[NL80211_BSS_SIGNAL_MBM]) {
659 r->level = nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]);
660 r->level /= 100; /* mBm to dBm */
661 r->flags |= WPA_SCAN_LEVEL_DBM | WPA_SCAN_QUAL_INVALID;
662 } else if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
663 r->level = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
664 r->flags |= WPA_SCAN_QUAL_INVALID;
665 } else
666 r->flags |= WPA_SCAN_LEVEL_INVALID | WPA_SCAN_QUAL_INVALID;
667 if (bss[NL80211_BSS_TSF])
668 r->tsf = nla_get_u64(bss[NL80211_BSS_TSF]);
669 if (bss[NL80211_BSS_BEACON_TSF]) {
670 u64 tsf = nla_get_u64(bss[NL80211_BSS_BEACON_TSF]);
671 if (tsf > r->tsf)
672 r->tsf = tsf;
673 }
674 if (bss[NL80211_BSS_SEEN_MS_AGO])
675 r->age = nla_get_u32(bss[NL80211_BSS_SEEN_MS_AGO]);
676 r->ie_len = ie_len;
677 pos = (u8 *) (r + 1);
678 if (ie) {
679 os_memcpy(pos, ie, ie_len);
680 pos += ie_len;
681 }
682 r->beacon_ie_len = beacon_ie_len;
683 if (beacon_ie)
684 os_memcpy(pos, beacon_ie, beacon_ie_len);
685
686 if (bss[NL80211_BSS_STATUS]) {
687 enum nl80211_bss_status status;
688 status = nla_get_u32(bss[NL80211_BSS_STATUS]);
689 switch (status) {
690 case NL80211_BSS_STATUS_ASSOCIATED:
691 r->flags |= WPA_SCAN_ASSOCIATED;
692 break;
693 default:
694 break;
695 }
696 }
697
698 /*
699 * cfg80211 maintains separate BSS table entries for APs if the same
700 * BSSID,SSID pair is seen on multiple channels. wpa_supplicant does
701 * not use frequency as a separate key in the BSS table, so filter out
702 * duplicated entries. Prefer associated BSS entry in such a case in
703 * order to get the correct frequency into the BSS table. Similarly,
704 * prefer newer entries over older.
705 */
706 for (i = 0; i < res->num; i++) {
707 const u8 *s1, *s2;
708 if (os_memcmp(res->res[i]->bssid, r->bssid, ETH_ALEN) != 0)
709 continue;
710
711 s1 = get_ie((u8 *) (res->res[i] + 1),
712 res->res[i]->ie_len, WLAN_EID_SSID);
713 s2 = get_ie((u8 *) (r + 1), r->ie_len, WLAN_EID_SSID);
714 if (s1 == NULL || s2 == NULL || s1[1] != s2[1] ||
715 os_memcmp(s1, s2, 2 + s1[1]) != 0)
716 continue;
717
718 /* Same BSSID,SSID was already included in scan results */
719 wpa_printf(MSG_DEBUG, "nl80211: Remove duplicated scan result "
720 "for " MACSTR, MAC2STR(r->bssid));
721
722 if (((r->flags & WPA_SCAN_ASSOCIATED) &&
723 !(res->res[i]->flags & WPA_SCAN_ASSOCIATED)) ||
724 r->age < res->res[i]->age) {
725 os_free(res->res[i]);
726 res->res[i] = r;
727 } else
728 os_free(r);
729 return NL_SKIP;
730 }
731
732 tmp = os_realloc_array(res->res, res->num + 1,
733 sizeof(struct wpa_scan_res *));
734 if (tmp == NULL) {
735 os_free(r);
736 return NL_SKIP;
737 }
738 tmp[res->num++] = r;
739 res->res = tmp;
740
741 return NL_SKIP;
742 }
743
744
clear_state_mismatch(struct wpa_driver_nl80211_data * drv,const u8 * addr)745 static void clear_state_mismatch(struct wpa_driver_nl80211_data *drv,
746 const u8 *addr)
747 {
748 if (drv->capa.flags & WPA_DRIVER_FLAGS_SME) {
749 wpa_printf(MSG_DEBUG, "nl80211: Clear possible state "
750 "mismatch (" MACSTR ")", MAC2STR(addr));
751 wpa_driver_nl80211_mlme(drv, addr,
752 NL80211_CMD_DEAUTHENTICATE,
753 WLAN_REASON_PREV_AUTH_NOT_VALID, 1);
754 }
755 }
756
757
wpa_driver_nl80211_check_bss_status(struct wpa_driver_nl80211_data * drv,struct wpa_scan_results * res)758 static void wpa_driver_nl80211_check_bss_status(
759 struct wpa_driver_nl80211_data *drv, struct wpa_scan_results *res)
760 {
761 size_t i;
762
763 for (i = 0; i < res->num; i++) {
764 struct wpa_scan_res *r = res->res[i];
765
766 if (r->flags & WPA_SCAN_ASSOCIATED) {
767 wpa_printf(MSG_DEBUG, "nl80211: Scan results "
768 "indicate BSS status with " MACSTR
769 " as associated",
770 MAC2STR(r->bssid));
771 if (is_sta_interface(drv->nlmode) &&
772 !drv->associated) {
773 wpa_printf(MSG_DEBUG, "nl80211: Local state "
774 "(not associated) does not match "
775 "with BSS state");
776 clear_state_mismatch(drv, r->bssid);
777 } else if (is_sta_interface(drv->nlmode) &&
778 os_memcmp(drv->bssid, r->bssid, ETH_ALEN) !=
779 0) {
780 wpa_printf(MSG_DEBUG, "nl80211: Local state "
781 "(associated with " MACSTR ") does "
782 "not match with BSS state",
783 MAC2STR(drv->bssid));
784 clear_state_mismatch(drv, r->bssid);
785 clear_state_mismatch(drv, drv->bssid);
786 }
787 }
788 }
789 }
790
791
792 static struct wpa_scan_results *
nl80211_get_scan_results(struct wpa_driver_nl80211_data * drv)793 nl80211_get_scan_results(struct wpa_driver_nl80211_data *drv)
794 {
795 struct nl_msg *msg;
796 struct wpa_scan_results *res;
797 int ret;
798 struct nl80211_bss_info_arg arg;
799
800 res = os_zalloc(sizeof(*res));
801 if (res == NULL)
802 return NULL;
803 if (!(msg = nl80211_cmd_msg(drv->first_bss, NLM_F_DUMP,
804 NL80211_CMD_GET_SCAN))) {
805 wpa_scan_results_free(res);
806 return NULL;
807 }
808
809 arg.drv = drv;
810 arg.res = res;
811 ret = send_and_recv_msgs(drv, msg, bss_info_handler, &arg);
812 if (ret == 0) {
813 wpa_printf(MSG_DEBUG, "nl80211: Received scan results (%lu "
814 "BSSes)", (unsigned long) res->num);
815 nl80211_get_noise_for_scan_results(drv, res);
816 return res;
817 }
818 wpa_printf(MSG_DEBUG, "nl80211: Scan result fetch failed: ret=%d "
819 "(%s)", ret, strerror(-ret));
820 wpa_scan_results_free(res);
821 return NULL;
822 }
823
824
825 /**
826 * wpa_driver_nl80211_get_scan_results - Fetch the latest scan results
827 * @priv: Pointer to private wext data from wpa_driver_nl80211_init()
828 * Returns: Scan results on success, -1 on failure
829 */
wpa_driver_nl80211_get_scan_results(void * priv)830 struct wpa_scan_results * wpa_driver_nl80211_get_scan_results(void *priv)
831 {
832 struct i802_bss *bss = priv;
833 struct wpa_driver_nl80211_data *drv = bss->drv;
834 struct wpa_scan_results *res;
835
836 res = nl80211_get_scan_results(drv);
837 if (res)
838 wpa_driver_nl80211_check_bss_status(drv, res);
839 return res;
840 }
841
842
nl80211_dump_scan(struct wpa_driver_nl80211_data * drv)843 void nl80211_dump_scan(struct wpa_driver_nl80211_data *drv)
844 {
845 struct wpa_scan_results *res;
846 size_t i;
847
848 res = nl80211_get_scan_results(drv);
849 if (res == NULL) {
850 wpa_printf(MSG_DEBUG, "nl80211: Failed to get scan results");
851 return;
852 }
853
854 wpa_printf(MSG_DEBUG, "nl80211: Scan result dump");
855 for (i = 0; i < res->num; i++) {
856 struct wpa_scan_res *r = res->res[i];
857 wpa_printf(MSG_DEBUG, "nl80211: %d/%d " MACSTR "%s",
858 (int) i, (int) res->num, MAC2STR(r->bssid),
859 r->flags & WPA_SCAN_ASSOCIATED ? " [assoc]" : "");
860 }
861
862 wpa_scan_results_free(res);
863 }
864
865
wpa_driver_nl80211_abort_scan(void * priv)866 int wpa_driver_nl80211_abort_scan(void *priv)
867 {
868 struct i802_bss *bss = priv;
869 struct wpa_driver_nl80211_data *drv = bss->drv;
870 int ret;
871 struct nl_msg *msg;
872
873 wpa_printf(MSG_DEBUG, "nl80211: Abort scan");
874 msg = nl80211_cmd_msg(bss, 0, NL80211_CMD_ABORT_SCAN);
875 ret = send_and_recv_msgs(drv, msg, NULL, NULL);
876 if (ret) {
877 wpa_printf(MSG_DEBUG, "nl80211: Abort scan failed: ret=%d (%s)",
878 ret, strerror(-ret));
879 }
880
881 return ret;
882 }
883
884
885 #ifdef CONFIG_DRIVER_NL80211_QCA
886
scan_cookie_handler(struct nl_msg * msg,void * arg)887 static int scan_cookie_handler(struct nl_msg *msg, void *arg)
888 {
889 struct nlattr *tb[NL80211_ATTR_MAX + 1];
890 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
891 u64 *cookie = arg;
892
893 nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
894 genlmsg_attrlen(gnlh, 0), NULL);
895
896 if (tb[NL80211_ATTR_VENDOR_DATA]) {
897 struct nlattr *nl_vendor = tb[NL80211_ATTR_VENDOR_DATA];
898 struct nlattr *tb_vendor[QCA_WLAN_VENDOR_ATTR_SCAN_MAX + 1];
899
900 nla_parse(tb_vendor, QCA_WLAN_VENDOR_ATTR_SCAN_MAX,
901 nla_data(nl_vendor), nla_len(nl_vendor), NULL);
902
903 if (tb_vendor[QCA_WLAN_VENDOR_ATTR_SCAN_COOKIE])
904 *cookie = nla_get_u64(
905 tb_vendor[QCA_WLAN_VENDOR_ATTR_SCAN_COOKIE]);
906 }
907
908 return NL_SKIP;
909 }
910
911
912 /**
913 * wpa_driver_nl80211_vendor_scan - Request the driver to initiate a vendor scan
914 * @bss: Pointer to private driver data from wpa_driver_nl80211_init()
915 * @params: Scan parameters
916 * Returns: 0 on success, -1 on failure
917 */
wpa_driver_nl80211_vendor_scan(struct i802_bss * bss,struct wpa_driver_scan_params * params)918 int wpa_driver_nl80211_vendor_scan(struct i802_bss *bss,
919 struct wpa_driver_scan_params *params)
920 {
921 struct wpa_driver_nl80211_data *drv = bss->drv;
922 struct nl_msg *msg = NULL;
923 struct nlattr *attr;
924 size_t i;
925 u32 scan_flags = 0;
926 int ret = -1;
927 u64 cookie = 0;
928
929 wpa_dbg(drv->ctx, MSG_DEBUG, "nl80211: vendor scan request");
930 drv->scan_for_auth = 0;
931
932 if (!(msg = nl80211_drv_msg(drv, 0, NL80211_CMD_VENDOR)) ||
933 nla_put_u32(msg, NL80211_ATTR_VENDOR_ID, OUI_QCA) ||
934 nla_put_u32(msg, NL80211_ATTR_VENDOR_SUBCMD,
935 QCA_NL80211_VENDOR_SUBCMD_TRIGGER_SCAN) )
936 goto fail;
937
938 attr = nla_nest_start(msg, NL80211_ATTR_VENDOR_DATA);
939 if (attr == NULL)
940 goto fail;
941
942 if (params->num_ssids) {
943 struct nlattr *ssids;
944
945 ssids = nla_nest_start(msg, QCA_WLAN_VENDOR_ATTR_SCAN_SSIDS);
946 if (ssids == NULL)
947 goto fail;
948 for (i = 0; i < params->num_ssids; i++) {
949 wpa_hexdump_ascii(MSG_MSGDUMP, "nl80211: Scan SSID",
950 params->ssids[i].ssid,
951 params->ssids[i].ssid_len);
952 if (nla_put(msg, i + 1, params->ssids[i].ssid_len,
953 params->ssids[i].ssid))
954 goto fail;
955 }
956 nla_nest_end(msg, ssids);
957 }
958
959 if (params->extra_ies) {
960 wpa_hexdump(MSG_MSGDUMP, "nl80211: Scan extra IEs",
961 params->extra_ies, params->extra_ies_len);
962 if (nla_put(msg, QCA_WLAN_VENDOR_ATTR_SCAN_IE,
963 params->extra_ies_len, params->extra_ies))
964 goto fail;
965 }
966
967 if (params->freqs) {
968 struct nlattr *freqs;
969
970 freqs = nla_nest_start(msg,
971 QCA_WLAN_VENDOR_ATTR_SCAN_FREQUENCIES);
972 if (freqs == NULL)
973 goto fail;
974 for (i = 0; params->freqs[i]; i++) {
975 wpa_printf(MSG_MSGDUMP,
976 "nl80211: Scan frequency %u MHz",
977 params->freqs[i]);
978 if (nla_put_u32(msg, i + 1, params->freqs[i]))
979 goto fail;
980 }
981 nla_nest_end(msg, freqs);
982 }
983
984 os_free(drv->filter_ssids);
985 drv->filter_ssids = params->filter_ssids;
986 params->filter_ssids = NULL;
987 drv->num_filter_ssids = params->num_filter_ssids;
988
989 if (params->low_priority && drv->have_low_prio_scan) {
990 wpa_printf(MSG_DEBUG,
991 "nl80211: Add NL80211_SCAN_FLAG_LOW_PRIORITY");
992 scan_flags |= NL80211_SCAN_FLAG_LOW_PRIORITY;
993 }
994
995 if (params->mac_addr_rand) {
996 wpa_printf(MSG_DEBUG,
997 "nl80211: Add NL80211_SCAN_FLAG_RANDOM_ADDR");
998 scan_flags |= NL80211_SCAN_FLAG_RANDOM_ADDR;
999
1000 if (params->mac_addr) {
1001 wpa_printf(MSG_DEBUG, "nl80211: MAC address: " MACSTR,
1002 MAC2STR(params->mac_addr));
1003 if (nla_put(msg, QCA_WLAN_VENDOR_ATTR_SCAN_MAC,
1004 ETH_ALEN, params->mac_addr))
1005 goto fail;
1006 }
1007
1008 if (params->mac_addr_mask) {
1009 wpa_printf(MSG_DEBUG, "nl80211: MAC address mask: "
1010 MACSTR, MAC2STR(params->mac_addr_mask));
1011 if (nla_put(msg, QCA_WLAN_VENDOR_ATTR_SCAN_MAC_MASK,
1012 ETH_ALEN, params->mac_addr_mask))
1013 goto fail;
1014 }
1015 }
1016
1017 if (scan_flags &&
1018 nla_put_u32(msg, NL80211_ATTR_SCAN_FLAGS, scan_flags))
1019 goto fail;
1020
1021 if (params->p2p_probe) {
1022 struct nlattr *rates;
1023
1024 wpa_printf(MSG_DEBUG, "nl80211: P2P probe - mask SuppRates");
1025
1026 rates = nla_nest_start(msg,
1027 QCA_WLAN_VENDOR_ATTR_SCAN_SUPP_RATES);
1028 if (rates == NULL)
1029 goto fail;
1030
1031 /*
1032 * Remove 2.4 GHz rates 1, 2, 5.5, 11 Mbps from supported rates
1033 * by masking out everything else apart from the OFDM rates 6,
1034 * 9, 12, 18, 24, 36, 48, 54 Mbps from non-MCS rates. All 5 GHz
1035 * rates are left enabled.
1036 */
1037 if (nla_put(msg, NL80211_BAND_2GHZ, 8,
1038 "\x0c\x12\x18\x24\x30\x48\x60\x6c"))
1039 goto fail;
1040 nla_nest_end(msg, rates);
1041
1042 if (nla_put_flag(msg, QCA_WLAN_VENDOR_ATTR_SCAN_TX_NO_CCK_RATE))
1043 goto fail;
1044 }
1045
1046 nla_nest_end(msg, attr);
1047
1048 ret = send_and_recv_msgs(drv, msg, scan_cookie_handler, &cookie);
1049 msg = NULL;
1050 if (ret) {
1051 wpa_printf(MSG_DEBUG,
1052 "nl80211: Vendor scan trigger failed: ret=%d (%s)",
1053 ret, strerror(-ret));
1054 goto fail;
1055 }
1056
1057 drv->vendor_scan_cookie = cookie;
1058 drv->scan_state = SCAN_REQUESTED;
1059
1060 wpa_printf(MSG_DEBUG,
1061 "nl80211: Vendor scan requested (ret=%d) - scan timeout 30 seconds, scan cookie:0x%llx",
1062 ret, (long long unsigned int) cookie);
1063 eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv, drv->ctx);
1064 eloop_register_timeout(30, 0, wpa_driver_nl80211_scan_timeout,
1065 drv, drv->ctx);
1066 drv->last_scan_cmd = NL80211_CMD_VENDOR;
1067
1068 fail:
1069 nlmsg_free(msg);
1070 return ret;
1071 }
1072
1073 #endif /* CONFIG_DRIVER_NL80211_QCA */
1074