Line data Source code
1 : /*
2 : * Driver interaction with Linux nl80211/cfg80211 - Scanning
3 : * Copyright (c) 2002-2014, Jouni Malinen <j@w1.fi>
4 : * Copyright (c) 2007, Johannes Berg <johannes@sipsolutions.net>
5 : * Copyright (c) 2009-2010, Atheros Communications
6 : *
7 : * This software may be distributed under the terms of the BSD license.
8 : * See README for more details.
9 : */
10 :
11 : #include "includes.h"
12 : #include <netlink/genl/genl.h>
13 :
14 : #include "utils/common.h"
15 : #include "utils/eloop.h"
16 : #include "common/ieee802_11_defs.h"
17 : #include "driver_nl80211.h"
18 :
19 :
20 2913 : static int get_noise_for_scan_results(struct nl_msg *msg, void *arg)
21 : {
22 : struct nlattr *tb[NL80211_ATTR_MAX + 1];
23 2913 : struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
24 : struct nlattr *sinfo[NL80211_SURVEY_INFO_MAX + 1];
25 : static struct nla_policy survey_policy[NL80211_SURVEY_INFO_MAX + 1] = {
26 : [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
27 : [NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 },
28 : };
29 2913 : struct wpa_scan_results *scan_results = arg;
30 : struct wpa_scan_res *scan_res;
31 : size_t i;
32 :
33 2913 : nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
34 : genlmsg_attrlen(gnlh, 0), NULL);
35 :
36 2913 : if (!tb[NL80211_ATTR_SURVEY_INFO]) {
37 0 : wpa_printf(MSG_DEBUG, "nl80211: Survey data missing");
38 0 : return NL_SKIP;
39 : }
40 :
41 2913 : if (nla_parse_nested(sinfo, NL80211_SURVEY_INFO_MAX,
42 : tb[NL80211_ATTR_SURVEY_INFO],
43 : survey_policy)) {
44 0 : wpa_printf(MSG_DEBUG, "nl80211: Failed to parse nested "
45 : "attributes");
46 0 : return NL_SKIP;
47 : }
48 :
49 2913 : if (!sinfo[NL80211_SURVEY_INFO_NOISE])
50 0 : return NL_SKIP;
51 :
52 2913 : if (!sinfo[NL80211_SURVEY_INFO_FREQUENCY])
53 0 : return NL_SKIP;
54 :
55 6805 : for (i = 0; i < scan_results->num; ++i) {
56 3892 : scan_res = scan_results->res[i];
57 3892 : if (!scan_res)
58 0 : continue;
59 7784 : if ((int) nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]) !=
60 3892 : scan_res->freq)
61 1112 : continue;
62 2780 : if (!(scan_res->flags & WPA_SCAN_NOISE_INVALID))
63 0 : continue;
64 2780 : scan_res->noise = (s8)
65 2780 : nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]);
66 2780 : scan_res->flags &= ~WPA_SCAN_NOISE_INVALID;
67 : }
68 :
69 2913 : return NL_SKIP;
70 : }
71 :
72 :
73 2940 : static int nl80211_get_noise_for_scan_results(
74 : struct wpa_driver_nl80211_data *drv,
75 : struct wpa_scan_results *scan_res)
76 : {
77 : struct nl_msg *msg;
78 :
79 2940 : msg = nl80211_drv_msg(drv, NLM_F_DUMP, NL80211_CMD_GET_SURVEY);
80 2940 : return send_and_recv_msgs(drv, msg, get_noise_for_scan_results,
81 : scan_res);
82 : }
83 :
84 :
85 : /**
86 : * wpa_driver_nl80211_scan_timeout - Scan timeout to report scan completion
87 : * @eloop_ctx: Driver private data
88 : * @timeout_ctx: ctx argument given to wpa_driver_nl80211_init()
89 : *
90 : * This function can be used as registered timeout when starting a scan to
91 : * generate a scan completed event if the driver does not report this.
92 : */
93 0 : void wpa_driver_nl80211_scan_timeout(void *eloop_ctx, void *timeout_ctx)
94 : {
95 0 : struct wpa_driver_nl80211_data *drv = eloop_ctx;
96 0 : if (drv->ap_scan_as_station != NL80211_IFTYPE_UNSPECIFIED) {
97 0 : wpa_driver_nl80211_set_mode(drv->first_bss,
98 : drv->ap_scan_as_station);
99 0 : drv->ap_scan_as_station = NL80211_IFTYPE_UNSPECIFIED;
100 : }
101 0 : wpa_printf(MSG_DEBUG, "Scan timeout - try to get results");
102 0 : wpa_supplicant_event(timeout_ctx, EVENT_SCAN_RESULTS, NULL);
103 0 : }
104 :
105 :
106 : static struct nl_msg *
107 2945 : nl80211_scan_common(struct i802_bss *bss, u8 cmd,
108 : struct wpa_driver_scan_params *params)
109 : {
110 2945 : struct wpa_driver_nl80211_data *drv = bss->drv;
111 : struct nl_msg *msg;
112 : size_t i;
113 2945 : u32 scan_flags = 0;
114 :
115 2945 : msg = nl80211_cmd_msg(bss, 0, cmd);
116 2945 : if (!msg)
117 0 : return NULL;
118 :
119 2945 : if (params->num_ssids) {
120 : struct nlattr *ssids;
121 :
122 2832 : ssids = nla_nest_start(msg, NL80211_ATTR_SCAN_SSIDS);
123 2832 : if (ssids == NULL)
124 0 : goto fail;
125 5680 : for (i = 0; i < params->num_ssids; i++) {
126 5696 : wpa_hexdump_ascii(MSG_MSGDUMP, "nl80211: Scan SSID",
127 2848 : params->ssids[i].ssid,
128 : params->ssids[i].ssid_len);
129 2848 : if (nla_put(msg, i + 1, params->ssids[i].ssid_len,
130 2848 : params->ssids[i].ssid))
131 0 : goto fail;
132 : }
133 2832 : nla_nest_end(msg, ssids);
134 : }
135 :
136 2945 : if (params->extra_ies) {
137 5678 : wpa_hexdump(MSG_MSGDUMP, "nl80211: Scan extra IEs",
138 2839 : params->extra_ies, params->extra_ies_len);
139 2839 : if (nla_put(msg, NL80211_ATTR_IE, params->extra_ies_len,
140 2839 : params->extra_ies))
141 0 : goto fail;
142 : }
143 :
144 2945 : if (params->freqs) {
145 : struct nlattr *freqs;
146 2721 : freqs = nla_nest_start(msg, NL80211_ATTR_SCAN_FREQUENCIES);
147 2721 : if (freqs == NULL)
148 0 : goto fail;
149 7616 : for (i = 0; params->freqs[i]; i++) {
150 4895 : wpa_printf(MSG_MSGDUMP, "nl80211: Scan frequency %u "
151 4895 : "MHz", params->freqs[i]);
152 4895 : if (nla_put_u32(msg, i + 1, params->freqs[i]))
153 0 : goto fail;
154 : }
155 2721 : nla_nest_end(msg, freqs);
156 : }
157 :
158 2945 : os_free(drv->filter_ssids);
159 2945 : drv->filter_ssids = params->filter_ssids;
160 2945 : params->filter_ssids = NULL;
161 2945 : drv->num_filter_ssids = params->num_filter_ssids;
162 :
163 2945 : if (params->only_new_results) {
164 1250 : wpa_printf(MSG_DEBUG, "nl80211: Add NL80211_SCAN_FLAG_FLUSH");
165 1250 : scan_flags |= NL80211_SCAN_FLAG_FLUSH;
166 : }
167 :
168 2945 : if (params->low_priority && drv->have_low_prio_scan) {
169 4 : wpa_printf(MSG_DEBUG,
170 : "nl80211: Add NL80211_SCAN_FLAG_LOW_PRIORITY");
171 4 : scan_flags |= NL80211_SCAN_FLAG_LOW_PRIORITY;
172 : }
173 :
174 2945 : if (params->mac_addr_rand) {
175 3 : wpa_printf(MSG_DEBUG,
176 : "nl80211: Add NL80211_SCAN_FLAG_RANDOM_ADDR");
177 3 : scan_flags |= NL80211_SCAN_FLAG_RANDOM_ADDR;
178 :
179 3 : if (params->mac_addr) {
180 12 : wpa_printf(MSG_DEBUG, "nl80211: MAC address: " MACSTR,
181 12 : MAC2STR(params->mac_addr));
182 2 : if (nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN,
183 2 : params->mac_addr))
184 0 : goto fail;
185 : }
186 :
187 3 : if (params->mac_addr_mask) {
188 12 : wpa_printf(MSG_DEBUG, "nl80211: MAC address mask: "
189 12 : MACSTR, MAC2STR(params->mac_addr_mask));
190 2 : if (nla_put(msg, NL80211_ATTR_MAC_MASK, ETH_ALEN,
191 2 : params->mac_addr_mask))
192 0 : goto fail;
193 : }
194 : }
195 :
196 4201 : if (scan_flags &&
197 1256 : nla_put_u32(msg, NL80211_ATTR_SCAN_FLAGS, scan_flags))
198 0 : goto fail;
199 :
200 2945 : return msg;
201 :
202 : fail:
203 0 : nlmsg_free(msg);
204 0 : return NULL;
205 : }
206 :
207 :
208 : /**
209 : * wpa_driver_nl80211_scan - Request the driver to initiate scan
210 : * @bss: Pointer to private driver data from wpa_driver_nl80211_init()
211 : * @params: Scan parameters
212 : * Returns: 0 on success, -1 on failure
213 : */
214 2945 : int wpa_driver_nl80211_scan(struct i802_bss *bss,
215 : struct wpa_driver_scan_params *params)
216 : {
217 2945 : struct wpa_driver_nl80211_data *drv = bss->drv;
218 2945 : int ret = -1, timeout;
219 2945 : struct nl_msg *msg = NULL;
220 :
221 2945 : wpa_dbg(drv->ctx, MSG_DEBUG, "nl80211: scan request");
222 2945 : drv->scan_for_auth = 0;
223 :
224 2945 : msg = nl80211_scan_common(bss, NL80211_CMD_TRIGGER_SCAN, params);
225 2945 : if (!msg)
226 0 : return -1;
227 :
228 2945 : if (params->p2p_probe) {
229 : struct nlattr *rates;
230 :
231 1097 : wpa_printf(MSG_DEBUG, "nl80211: P2P probe - mask SuppRates");
232 :
233 1097 : rates = nla_nest_start(msg, NL80211_ATTR_SCAN_SUPP_RATES);
234 1097 : if (rates == NULL)
235 0 : goto fail;
236 :
237 : /*
238 : * Remove 2.4 GHz rates 1, 2, 5.5, 11 Mbps from supported rates
239 : * by masking out everything else apart from the OFDM rates 6,
240 : * 9, 12, 18, 24, 36, 48, 54 Mbps from non-MCS rates. All 5 GHz
241 : * rates are left enabled.
242 : */
243 1097 : if (nla_put(msg, NL80211_BAND_2GHZ, 8,
244 : "\x0c\x12\x18\x24\x30\x48\x60\x6c"))
245 0 : goto fail;
246 1097 : nla_nest_end(msg, rates);
247 :
248 1097 : if (nla_put_flag(msg, NL80211_ATTR_TX_NO_CCK_RATE))
249 0 : goto fail;
250 : }
251 :
252 2945 : ret = send_and_recv_msgs(drv, msg, NULL, NULL);
253 2945 : msg = NULL;
254 2945 : if (ret) {
255 6 : wpa_printf(MSG_DEBUG, "nl80211: Scan trigger failed: ret=%d "
256 : "(%s)", ret, strerror(-ret));
257 6 : if (drv->hostapd && is_ap_interface(drv->nlmode)) {
258 0 : enum nl80211_iftype old_mode = drv->nlmode;
259 :
260 : /*
261 : * mac80211 does not allow scan requests in AP mode, so
262 : * try to do this in station mode.
263 : */
264 0 : if (wpa_driver_nl80211_set_mode(
265 : bss, NL80211_IFTYPE_STATION))
266 0 : goto fail;
267 :
268 0 : if (wpa_driver_nl80211_scan(bss, params)) {
269 0 : wpa_driver_nl80211_set_mode(bss, old_mode);
270 0 : goto fail;
271 : }
272 :
273 : /* Restore AP mode when processing scan results */
274 0 : drv->ap_scan_as_station = old_mode;
275 0 : ret = 0;
276 : } else
277 : goto fail;
278 : }
279 :
280 2939 : drv->scan_state = SCAN_REQUESTED;
281 : /* Not all drivers generate "scan completed" wireless event, so try to
282 : * read results after a timeout. */
283 2939 : timeout = 10;
284 2939 : if (drv->scan_complete_events) {
285 : /*
286 : * The driver seems to deliver events to notify when scan is
287 : * complete, so use longer timeout to avoid race conditions
288 : * with scanning and following association request.
289 : */
290 2787 : timeout = 30;
291 : }
292 2939 : wpa_printf(MSG_DEBUG, "Scan requested (ret=%d) - scan timeout %d "
293 : "seconds", ret, timeout);
294 2939 : eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv, drv->ctx);
295 2939 : eloop_register_timeout(timeout, 0, wpa_driver_nl80211_scan_timeout,
296 : drv, drv->ctx);
297 :
298 : fail:
299 2945 : nlmsg_free(msg);
300 2945 : return ret;
301 : }
302 :
303 :
304 : /**
305 : * wpa_driver_nl80211_sched_scan - Initiate a scheduled scan
306 : * @priv: Pointer to private driver data from wpa_driver_nl80211_init()
307 : * @params: Scan parameters
308 : * @interval: Interval between scan cycles in milliseconds
309 : * Returns: 0 on success, -1 on failure or if not supported
310 : */
311 0 : int wpa_driver_nl80211_sched_scan(void *priv,
312 : struct wpa_driver_scan_params *params,
313 : u32 interval)
314 : {
315 0 : struct i802_bss *bss = priv;
316 0 : struct wpa_driver_nl80211_data *drv = bss->drv;
317 0 : int ret = -1;
318 : struct nl_msg *msg;
319 : size_t i;
320 :
321 0 : wpa_dbg(drv->ctx, MSG_DEBUG, "nl80211: sched_scan request");
322 :
323 : #ifdef ANDROID
324 : if (!drv->capa.sched_scan_supported)
325 : return android_pno_start(bss, params);
326 : #endif /* ANDROID */
327 :
328 0 : msg = nl80211_scan_common(bss, NL80211_CMD_START_SCHED_SCAN, params);
329 0 : if (!msg ||
330 0 : nla_put_u32(msg, NL80211_ATTR_SCHED_SCAN_INTERVAL, interval))
331 : goto fail;
332 :
333 0 : if ((drv->num_filter_ssids &&
334 0 : (int) drv->num_filter_ssids <= drv->capa.max_match_sets) ||
335 0 : params->filter_rssi) {
336 : struct nlattr *match_sets;
337 0 : match_sets = nla_nest_start(msg, NL80211_ATTR_SCHED_SCAN_MATCH);
338 0 : if (match_sets == NULL)
339 0 : goto fail;
340 :
341 0 : for (i = 0; i < drv->num_filter_ssids; i++) {
342 : struct nlattr *match_set_ssid;
343 0 : wpa_hexdump_ascii(MSG_MSGDUMP,
344 : "nl80211: Sched scan filter SSID",
345 0 : drv->filter_ssids[i].ssid,
346 0 : drv->filter_ssids[i].ssid_len);
347 :
348 0 : match_set_ssid = nla_nest_start(msg, i + 1);
349 0 : if (match_set_ssid == NULL ||
350 0 : nla_put(msg, NL80211_ATTR_SCHED_SCAN_MATCH_SSID,
351 0 : drv->filter_ssids[i].ssid_len,
352 0 : drv->filter_ssids[i].ssid) ||
353 0 : (params->filter_rssi &&
354 0 : nla_put_u32(msg,
355 : NL80211_SCHED_SCAN_MATCH_ATTR_RSSI,
356 0 : params->filter_rssi)))
357 : goto fail;
358 :
359 0 : nla_nest_end(msg, match_set_ssid);
360 : }
361 :
362 : /*
363 : * Due to backward compatibility code, newer kernels treat this
364 : * matchset (with only an RSSI filter) as the default for all
365 : * other matchsets, unless it's the only one, in which case the
366 : * matchset will actually allow all SSIDs above the RSSI.
367 : */
368 0 : if (params->filter_rssi) {
369 : struct nlattr *match_set_rssi;
370 0 : match_set_rssi = nla_nest_start(msg, 0);
371 0 : if (match_set_rssi == NULL ||
372 0 : nla_put_u32(msg, NL80211_SCHED_SCAN_MATCH_ATTR_RSSI,
373 0 : params->filter_rssi))
374 : goto fail;
375 0 : wpa_printf(MSG_MSGDUMP,
376 : "nl80211: Sched scan RSSI filter %d dBm",
377 : params->filter_rssi);
378 0 : nla_nest_end(msg, match_set_rssi);
379 : }
380 :
381 0 : nla_nest_end(msg, match_sets);
382 : }
383 :
384 0 : ret = send_and_recv_msgs(drv, msg, NULL, NULL);
385 :
386 : /* TODO: if we get an error here, we should fall back to normal scan */
387 :
388 0 : msg = NULL;
389 0 : if (ret) {
390 0 : wpa_printf(MSG_DEBUG, "nl80211: Sched scan start failed: "
391 : "ret=%d (%s)", ret, strerror(-ret));
392 0 : goto fail;
393 : }
394 :
395 0 : wpa_printf(MSG_DEBUG, "nl80211: Sched scan requested (ret=%d) - "
396 : "scan interval %d msec", ret, interval);
397 :
398 : fail:
399 0 : nlmsg_free(msg);
400 0 : return ret;
401 : }
402 :
403 :
404 : /**
405 : * wpa_driver_nl80211_stop_sched_scan - Stop a scheduled scan
406 : * @priv: Pointer to private driver data from wpa_driver_nl80211_init()
407 : * Returns: 0 on success, -1 on failure or if not supported
408 : */
409 0 : int wpa_driver_nl80211_stop_sched_scan(void *priv)
410 : {
411 0 : struct i802_bss *bss = priv;
412 0 : struct wpa_driver_nl80211_data *drv = bss->drv;
413 : int ret;
414 : struct nl_msg *msg;
415 :
416 : #ifdef ANDROID
417 : if (!drv->capa.sched_scan_supported)
418 : return android_pno_stop(bss);
419 : #endif /* ANDROID */
420 :
421 0 : msg = nl80211_drv_msg(drv, 0, NL80211_CMD_STOP_SCHED_SCAN);
422 0 : ret = send_and_recv_msgs(drv, msg, NULL, NULL);
423 0 : if (ret) {
424 0 : wpa_printf(MSG_DEBUG,
425 : "nl80211: Sched scan stop failed: ret=%d (%s)",
426 : ret, strerror(-ret));
427 : } else {
428 0 : wpa_printf(MSG_DEBUG,
429 : "nl80211: Sched scan stop sent");
430 : }
431 :
432 0 : return ret;
433 : }
434 :
435 :
436 768 : static const u8 * nl80211_get_ie(const u8 *ies, size_t ies_len, u8 ie)
437 : {
438 : const u8 *end, *pos;
439 :
440 768 : if (ies == NULL)
441 0 : return NULL;
442 :
443 768 : pos = ies;
444 768 : end = ies + ies_len;
445 :
446 1536 : while (pos + 1 < end) {
447 768 : if (pos + 2 + pos[1] > end)
448 0 : break;
449 768 : if (pos[0] == ie)
450 768 : return pos;
451 0 : pos += 2 + pos[1];
452 : }
453 :
454 0 : return NULL;
455 : }
456 :
457 :
458 3933 : static int nl80211_scan_filtered(struct wpa_driver_nl80211_data *drv,
459 : const u8 *ie, size_t ie_len)
460 : {
461 : const u8 *ssid;
462 : size_t i;
463 :
464 3933 : if (drv->filter_ssids == NULL)
465 3929 : return 0;
466 :
467 4 : ssid = nl80211_get_ie(ie, ie_len, WLAN_EID_SSID);
468 4 : if (ssid == NULL)
469 0 : return 1;
470 :
471 7 : for (i = 0; i < drv->num_filter_ssids; i++) {
472 5 : if (ssid[1] == drv->filter_ssids[i].ssid_len &&
473 1 : os_memcmp(ssid + 2, drv->filter_ssids[i].ssid, ssid[1]) ==
474 : 0)
475 1 : return 0;
476 : }
477 :
478 3 : return 1;
479 : }
480 :
481 :
482 4010 : int bss_info_handler(struct nl_msg *msg, void *arg)
483 : {
484 : struct nlattr *tb[NL80211_ATTR_MAX + 1];
485 4010 : struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
486 : struct nlattr *bss[NL80211_BSS_MAX + 1];
487 : static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
488 : [NL80211_BSS_BSSID] = { .type = NLA_UNSPEC },
489 : [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
490 : [NL80211_BSS_TSF] = { .type = NLA_U64 },
491 : [NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 },
492 : [NL80211_BSS_CAPABILITY] = { .type = NLA_U16 },
493 : [NL80211_BSS_INFORMATION_ELEMENTS] = { .type = NLA_UNSPEC },
494 : [NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
495 : [NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
496 : [NL80211_BSS_STATUS] = { .type = NLA_U32 },
497 : [NL80211_BSS_SEEN_MS_AGO] = { .type = NLA_U32 },
498 : [NL80211_BSS_BEACON_IES] = { .type = NLA_UNSPEC },
499 : };
500 4010 : struct nl80211_bss_info_arg *_arg = arg;
501 4010 : struct wpa_scan_results *res = _arg->res;
502 : struct wpa_scan_res **tmp;
503 : struct wpa_scan_res *r;
504 : const u8 *ie, *beacon_ie;
505 : size_t ie_len, beacon_ie_len;
506 : u8 *pos;
507 : size_t i;
508 :
509 4010 : nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
510 : genlmsg_attrlen(gnlh, 0), NULL);
511 4010 : if (!tb[NL80211_ATTR_BSS])
512 0 : return NL_SKIP;
513 4010 : if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
514 : bss_policy))
515 0 : return NL_SKIP;
516 4010 : if (bss[NL80211_BSS_STATUS]) {
517 : enum nl80211_bss_status status;
518 194 : status = nla_get_u32(bss[NL80211_BSS_STATUS]);
519 333 : if (status == NL80211_BSS_STATUS_ASSOCIATED &&
520 139 : bss[NL80211_BSS_FREQUENCY]) {
521 139 : _arg->assoc_freq =
522 139 : nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
523 139 : wpa_printf(MSG_DEBUG, "nl80211: Associated on %u MHz",
524 : _arg->assoc_freq);
525 : }
526 249 : if (status == NL80211_BSS_STATUS_IBSS_JOINED &&
527 55 : bss[NL80211_BSS_FREQUENCY]) {
528 55 : _arg->ibss_freq =
529 55 : nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
530 55 : wpa_printf(MSG_DEBUG, "nl80211: IBSS-joined on %u MHz",
531 : _arg->ibss_freq);
532 : }
533 333 : if (status == NL80211_BSS_STATUS_ASSOCIATED &&
534 139 : bss[NL80211_BSS_BSSID]) {
535 139 : os_memcpy(_arg->assoc_bssid,
536 : nla_data(bss[NL80211_BSS_BSSID]), ETH_ALEN);
537 834 : wpa_printf(MSG_DEBUG, "nl80211: Associated with "
538 834 : MACSTR, MAC2STR(_arg->assoc_bssid));
539 : }
540 : }
541 4010 : if (!res)
542 77 : return NL_SKIP;
543 3933 : if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) {
544 3933 : ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
545 3933 : ie_len = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
546 : } else {
547 0 : ie = NULL;
548 0 : ie_len = 0;
549 : }
550 3933 : if (bss[NL80211_BSS_BEACON_IES]) {
551 2095 : beacon_ie = nla_data(bss[NL80211_BSS_BEACON_IES]);
552 2095 : beacon_ie_len = nla_len(bss[NL80211_BSS_BEACON_IES]);
553 : } else {
554 1838 : beacon_ie = NULL;
555 1838 : beacon_ie_len = 0;
556 : }
557 :
558 3933 : if (nl80211_scan_filtered(_arg->drv, ie ? ie : beacon_ie,
559 : ie ? ie_len : beacon_ie_len))
560 3 : return NL_SKIP;
561 :
562 3930 : r = os_zalloc(sizeof(*r) + ie_len + beacon_ie_len);
563 3930 : if (r == NULL)
564 0 : return NL_SKIP;
565 3930 : if (bss[NL80211_BSS_BSSID])
566 3930 : os_memcpy(r->bssid, nla_data(bss[NL80211_BSS_BSSID]),
567 : ETH_ALEN);
568 3930 : if (bss[NL80211_BSS_FREQUENCY])
569 3930 : r->freq = nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
570 3930 : if (bss[NL80211_BSS_BEACON_INTERVAL])
571 3930 : r->beacon_int = nla_get_u16(bss[NL80211_BSS_BEACON_INTERVAL]);
572 3930 : if (bss[NL80211_BSS_CAPABILITY])
573 3930 : r->caps = nla_get_u16(bss[NL80211_BSS_CAPABILITY]);
574 3930 : r->flags |= WPA_SCAN_NOISE_INVALID;
575 3930 : if (bss[NL80211_BSS_SIGNAL_MBM]) {
576 3930 : r->level = nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]);
577 3930 : r->level /= 100; /* mBm to dBm */
578 3930 : r->flags |= WPA_SCAN_LEVEL_DBM | WPA_SCAN_QUAL_INVALID;
579 0 : } else if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
580 0 : r->level = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
581 0 : r->flags |= WPA_SCAN_QUAL_INVALID;
582 : } else
583 0 : r->flags |= WPA_SCAN_LEVEL_INVALID | WPA_SCAN_QUAL_INVALID;
584 3930 : if (bss[NL80211_BSS_TSF])
585 3930 : r->tsf = nla_get_u64(bss[NL80211_BSS_TSF]);
586 3930 : if (bss[NL80211_BSS_SEEN_MS_AGO])
587 3930 : r->age = nla_get_u32(bss[NL80211_BSS_SEEN_MS_AGO]);
588 3930 : r->ie_len = ie_len;
589 3930 : pos = (u8 *) (r + 1);
590 3930 : if (ie) {
591 3930 : os_memcpy(pos, ie, ie_len);
592 3930 : pos += ie_len;
593 : }
594 3930 : r->beacon_ie_len = beacon_ie_len;
595 3930 : if (beacon_ie)
596 2093 : os_memcpy(pos, beacon_ie, beacon_ie_len);
597 :
598 3930 : if (bss[NL80211_BSS_STATUS]) {
599 : enum nl80211_bss_status status;
600 135 : status = nla_get_u32(bss[NL80211_BSS_STATUS]);
601 135 : switch (status) {
602 : case NL80211_BSS_STATUS_ASSOCIATED:
603 121 : r->flags |= WPA_SCAN_ASSOCIATED;
604 121 : break;
605 : default:
606 14 : break;
607 : }
608 : }
609 :
610 : /*
611 : * cfg80211 maintains separate BSS table entries for APs if the same
612 : * BSSID,SSID pair is seen on multiple channels. wpa_supplicant does
613 : * not use frequency as a separate key in the BSS table, so filter out
614 : * duplicated entries. Prefer associated BSS entry in such a case in
615 : * order to get the correct frequency into the BSS table. Similarly,
616 : * prefer newer entries over older.
617 : */
618 5615 : for (i = 0; i < res->num; i++) {
619 : const u8 *s1, *s2;
620 1691 : if (os_memcmp(res->res[i]->bssid, r->bssid, ETH_ALEN) != 0)
621 1309 : continue;
622 :
623 382 : s1 = nl80211_get_ie((u8 *) (res->res[i] + 1),
624 382 : res->res[i]->ie_len, WLAN_EID_SSID);
625 382 : s2 = nl80211_get_ie((u8 *) (r + 1), r->ie_len, WLAN_EID_SSID);
626 509 : if (s1 == NULL || s2 == NULL || s1[1] != s2[1] ||
627 127 : os_memcmp(s1, s2, 2 + s1[1]) != 0)
628 376 : continue;
629 :
630 : /* Same BSSID,SSID was already included in scan results */
631 36 : wpa_printf(MSG_DEBUG, "nl80211: Remove duplicated scan result "
632 36 : "for " MACSTR, MAC2STR(r->bssid));
633 :
634 6 : if (((r->flags & WPA_SCAN_ASSOCIATED) &&
635 6 : !(res->res[i]->flags & WPA_SCAN_ASSOCIATED)) ||
636 6 : r->age < res->res[i]->age) {
637 6 : os_free(res->res[i]);
638 6 : res->res[i] = r;
639 : } else
640 0 : os_free(r);
641 6 : return NL_SKIP;
642 : }
643 :
644 3924 : tmp = os_realloc_array(res->res, res->num + 1,
645 : sizeof(struct wpa_scan_res *));
646 3924 : if (tmp == NULL) {
647 0 : os_free(r);
648 0 : return NL_SKIP;
649 : }
650 3924 : tmp[res->num++] = r;
651 3924 : res->res = tmp;
652 :
653 3924 : return NL_SKIP;
654 : }
655 :
656 :
657 0 : static void clear_state_mismatch(struct wpa_driver_nl80211_data *drv,
658 : const u8 *addr)
659 : {
660 0 : if (drv->capa.flags & WPA_DRIVER_FLAGS_SME) {
661 0 : wpa_printf(MSG_DEBUG, "nl80211: Clear possible state "
662 0 : "mismatch (" MACSTR ")", MAC2STR(addr));
663 0 : wpa_driver_nl80211_mlme(drv, addr,
664 : NL80211_CMD_DEAUTHENTICATE,
665 : WLAN_REASON_PREV_AUTH_NOT_VALID, 1);
666 : }
667 0 : }
668 :
669 :
670 2940 : static void wpa_driver_nl80211_check_bss_status(
671 : struct wpa_driver_nl80211_data *drv, struct wpa_scan_results *res)
672 : {
673 : size_t i;
674 :
675 6864 : for (i = 0; i < res->num; i++) {
676 3924 : struct wpa_scan_res *r = res->res[i];
677 :
678 3924 : if (r->flags & WPA_SCAN_ASSOCIATED) {
679 726 : wpa_printf(MSG_DEBUG, "nl80211: Scan results "
680 : "indicate BSS status with " MACSTR
681 : " as associated",
682 726 : MAC2STR(r->bssid));
683 242 : if (is_sta_interface(drv->nlmode) &&
684 121 : !drv->associated) {
685 0 : wpa_printf(MSG_DEBUG, "nl80211: Local state "
686 : "(not associated) does not match "
687 : "with BSS state");
688 0 : clear_state_mismatch(drv, r->bssid);
689 242 : } else if (is_sta_interface(drv->nlmode) &&
690 121 : os_memcmp(drv->bssid, r->bssid, ETH_ALEN) !=
691 : 0) {
692 0 : wpa_printf(MSG_DEBUG, "nl80211: Local state "
693 : "(associated with " MACSTR ") does "
694 : "not match with BSS state",
695 0 : MAC2STR(drv->bssid));
696 0 : clear_state_mismatch(drv, r->bssid);
697 0 : clear_state_mismatch(drv, drv->bssid);
698 : }
699 : }
700 : }
701 2940 : }
702 :
703 :
704 : static struct wpa_scan_results *
705 2940 : nl80211_get_scan_results(struct wpa_driver_nl80211_data *drv)
706 : {
707 : struct nl_msg *msg;
708 : struct wpa_scan_results *res;
709 : int ret;
710 : struct nl80211_bss_info_arg arg;
711 :
712 2940 : res = os_zalloc(sizeof(*res));
713 2940 : if (res == NULL)
714 0 : return NULL;
715 2940 : if (!(msg = nl80211_cmd_msg(drv->first_bss, NLM_F_DUMP,
716 : NL80211_CMD_GET_SCAN))) {
717 0 : wpa_scan_results_free(res);
718 0 : return NULL;
719 : }
720 :
721 2940 : arg.drv = drv;
722 2940 : arg.res = res;
723 2940 : ret = send_and_recv_msgs(drv, msg, bss_info_handler, &arg);
724 2940 : if (ret == 0) {
725 2940 : wpa_printf(MSG_DEBUG, "nl80211: Received scan results (%lu "
726 : "BSSes)", (unsigned long) res->num);
727 2940 : nl80211_get_noise_for_scan_results(drv, res);
728 2940 : return res;
729 : }
730 0 : wpa_printf(MSG_DEBUG, "nl80211: Scan result fetch failed: ret=%d "
731 : "(%s)", ret, strerror(-ret));
732 0 : wpa_scan_results_free(res);
733 0 : return NULL;
734 : }
735 :
736 :
737 : /**
738 : * wpa_driver_nl80211_get_scan_results - Fetch the latest scan results
739 : * @priv: Pointer to private wext data from wpa_driver_nl80211_init()
740 : * Returns: Scan results on success, -1 on failure
741 : */
742 2940 : struct wpa_scan_results * wpa_driver_nl80211_get_scan_results(void *priv)
743 : {
744 2940 : struct i802_bss *bss = priv;
745 2940 : struct wpa_driver_nl80211_data *drv = bss->drv;
746 : struct wpa_scan_results *res;
747 :
748 2940 : res = nl80211_get_scan_results(drv);
749 2940 : if (res)
750 2940 : wpa_driver_nl80211_check_bss_status(drv, res);
751 2940 : return res;
752 : }
753 :
754 :
755 0 : void nl80211_dump_scan(struct wpa_driver_nl80211_data *drv)
756 : {
757 : struct wpa_scan_results *res;
758 : size_t i;
759 :
760 0 : res = nl80211_get_scan_results(drv);
761 0 : if (res == NULL) {
762 0 : wpa_printf(MSG_DEBUG, "nl80211: Failed to get scan results");
763 0 : return;
764 : }
765 :
766 0 : wpa_printf(MSG_DEBUG, "nl80211: Scan result dump");
767 0 : for (i = 0; i < res->num; i++) {
768 0 : struct wpa_scan_res *r = res->res[i];
769 0 : wpa_printf(MSG_DEBUG, "nl80211: %d/%d " MACSTR "%s",
770 0 : (int) i, (int) res->num, MAC2STR(r->bssid),
771 0 : r->flags & WPA_SCAN_ASSOCIATED ? " [assoc]" : "");
772 : }
773 :
774 0 : wpa_scan_results_free(res);
775 : }
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