1 /*
2 * wpa_supplicant - WNM
3 * Copyright (c) 2011-2013, Qualcomm Atheros, Inc.
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "common/ieee802_11_defs.h"
13 #include "common/ieee802_11_common.h"
14 #include "common/wpa_ctrl.h"
15 #include "rsn_supp/wpa.h"
16 #include "config.h"
17 #include "wpa_supplicant_i.h"
18 #include "driver_i.h"
19 #include "scan.h"
20 #include "ctrl_iface.h"
21 #include "bss.h"
22 #include "wnm_sta.h"
23 #include "hs20_supplicant.h"
24
25 #define MAX_TFS_IE_LEN 1024
26 #define WNM_MAX_NEIGHBOR_REPORT 10
27
28 #define WNM_SCAN_RESULT_AGE 2 /* 2 seconds */
29
30 /* get the TFS IE from driver */
ieee80211_11_get_tfs_ie(struct wpa_supplicant * wpa_s,u8 * buf,u16 * buf_len,enum wnm_oper oper)31 static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
32 u16 *buf_len, enum wnm_oper oper)
33 {
34 wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
35
36 return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
37 }
38
39
40 /* set the TFS IE to driver */
ieee80211_11_set_tfs_ie(struct wpa_supplicant * wpa_s,const u8 * addr,const u8 * buf,u16 buf_len,enum wnm_oper oper)41 static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
42 const u8 *addr, const u8 *buf, u16 buf_len,
43 enum wnm_oper oper)
44 {
45 u16 len = buf_len;
46
47 wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
48
49 return wpa_drv_wnm_oper(wpa_s, oper, addr, (u8 *) buf, &len);
50 }
51
52
53 /* MLME-SLEEPMODE.request */
ieee802_11_send_wnmsleep_req(struct wpa_supplicant * wpa_s,u8 action,u16 intval,struct wpabuf * tfs_req)54 int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
55 u8 action, u16 intval, struct wpabuf *tfs_req)
56 {
57 struct ieee80211_mgmt *mgmt;
58 int res;
59 size_t len;
60 struct wnm_sleep_element *wnmsleep_ie;
61 u8 *wnmtfs_ie;
62 u8 wnmsleep_ie_len;
63 u16 wnmtfs_ie_len; /* possibly multiple IE(s) */
64 enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
65 WNM_SLEEP_TFS_REQ_IE_NONE;
66
67 wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request "
68 "action=%s to " MACSTR,
69 action == 0 ? "enter" : "exit",
70 MAC2STR(wpa_s->bssid));
71
72 /* WNM-Sleep Mode IE */
73 wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
74 wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
75 if (wnmsleep_ie == NULL)
76 return -1;
77 wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
78 wnmsleep_ie->len = wnmsleep_ie_len - 2;
79 wnmsleep_ie->action_type = action;
80 wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
81 wnmsleep_ie->intval = host_to_le16(intval);
82 wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element",
83 (u8 *) wnmsleep_ie, wnmsleep_ie_len);
84
85 /* TFS IE(s) */
86 if (tfs_req) {
87 wnmtfs_ie_len = wpabuf_len(tfs_req);
88 wnmtfs_ie = os_memdup(wpabuf_head(tfs_req), wnmtfs_ie_len);
89 if (wnmtfs_ie == NULL) {
90 os_free(wnmsleep_ie);
91 return -1;
92 }
93 } else {
94 wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
95 if (wnmtfs_ie == NULL) {
96 os_free(wnmsleep_ie);
97 return -1;
98 }
99 if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
100 tfs_oper)) {
101 wnmtfs_ie_len = 0;
102 os_free(wnmtfs_ie);
103 wnmtfs_ie = NULL;
104 }
105 }
106 wpa_hexdump(MSG_DEBUG, "WNM: TFS Request element",
107 (u8 *) wnmtfs_ie, wnmtfs_ie_len);
108
109 mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len);
110 if (mgmt == NULL) {
111 wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
112 "WNM-Sleep Request action frame");
113 os_free(wnmsleep_ie);
114 os_free(wnmtfs_ie);
115 return -1;
116 }
117
118 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
119 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
120 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
121 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
122 WLAN_FC_STYPE_ACTION);
123 mgmt->u.action.category = WLAN_ACTION_WNM;
124 mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ;
125 mgmt->u.action.u.wnm_sleep_req.dialogtoken = 1;
126 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
127 wnmsleep_ie_len);
128 /* copy TFS IE here */
129 if (wnmtfs_ie_len > 0) {
130 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
131 wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
132 }
133
134 len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
135 wnmtfs_ie_len;
136
137 res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
138 wpa_s->own_addr, wpa_s->bssid,
139 &mgmt->u.action.category, len, 0);
140 if (res < 0)
141 wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
142 "(action=%d, intval=%d)", action, intval);
143 else
144 wpa_s->wnmsleep_used = 1;
145
146 os_free(wnmsleep_ie);
147 os_free(wnmtfs_ie);
148 os_free(mgmt);
149
150 return res;
151 }
152
153
wnm_sleep_mode_enter_success(struct wpa_supplicant * wpa_s,const u8 * tfsresp_ie_start,const u8 * tfsresp_ie_end)154 static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s,
155 const u8 *tfsresp_ie_start,
156 const u8 *tfsresp_ie_end)
157 {
158 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
159 wpa_s->bssid, NULL, NULL);
160 /* remove GTK/IGTK ?? */
161
162 /* set the TFS Resp IE(s) */
163 if (tfsresp_ie_start && tfsresp_ie_end &&
164 tfsresp_ie_end - tfsresp_ie_start >= 0) {
165 u16 tfsresp_ie_len;
166 tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) -
167 tfsresp_ie_start;
168 wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
169 /* pass the TFS Resp IE(s) to driver for processing */
170 if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid,
171 tfsresp_ie_start,
172 tfsresp_ie_len,
173 WNM_SLEEP_TFS_RESP_IE_SET))
174 wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE");
175 }
176 }
177
178
wnm_sleep_mode_exit_success(struct wpa_supplicant * wpa_s,const u8 * frm,u16 key_len_total)179 static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
180 const u8 *frm, u16 key_len_total)
181 {
182 u8 *ptr, *end;
183 u8 gtk_len;
184
185 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM, wpa_s->bssid,
186 NULL, NULL);
187
188 /* Install GTK/IGTK */
189
190 /* point to key data field */
191 ptr = (u8 *) frm + 1 + 2;
192 end = ptr + key_len_total;
193 wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
194
195 if (key_len_total && !wpa_sm_pmf_enabled(wpa_s->wpa)) {
196 wpa_msg(wpa_s, MSG_INFO,
197 "WNM: Ignore Key Data in WNM-Sleep Mode Response - PMF not enabled");
198 return;
199 }
200
201 while (end - ptr > 1) {
202 if (2 + ptr[1] > end - ptr) {
203 wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
204 "length");
205 if (end > ptr) {
206 wpa_hexdump(MSG_DEBUG, "WNM: Remaining data",
207 ptr, end - ptr);
208 }
209 break;
210 }
211 if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
212 if (ptr[1] < 11 + 5) {
213 wpa_printf(MSG_DEBUG, "WNM: Too short GTK "
214 "subelem");
215 break;
216 }
217 gtk_len = *(ptr + 4);
218 if (ptr[1] < 11 + gtk_len ||
219 gtk_len < 5 || gtk_len > 32) {
220 wpa_printf(MSG_DEBUG, "WNM: Invalid GTK "
221 "subelem");
222 break;
223 }
224 wpa_wnmsleep_install_key(
225 wpa_s->wpa,
226 WNM_SLEEP_SUBELEM_GTK,
227 ptr);
228 ptr += 13 + gtk_len;
229 #ifdef CONFIG_IEEE80211W
230 } else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) {
231 if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) {
232 wpa_printf(MSG_DEBUG, "WNM: Too short IGTK "
233 "subelem");
234 break;
235 }
236 wpa_wnmsleep_install_key(wpa_s->wpa,
237 WNM_SLEEP_SUBELEM_IGTK, ptr);
238 ptr += 10 + WPA_IGTK_LEN;
239 #endif /* CONFIG_IEEE80211W */
240 } else
241 break; /* skip the loop */
242 }
243 }
244
245
ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant * wpa_s,const u8 * frm,int len)246 static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
247 const u8 *frm, int len)
248 {
249 /*
250 * Action [1] | Dialog Token [1] | Key Data Len [2] | Key Data |
251 * WNM-Sleep Mode IE | TFS Response IE
252 */
253 const u8 *pos = frm; /* point to payload after the action field */
254 u16 key_len_total;
255 struct wnm_sleep_element *wnmsleep_ie = NULL;
256 /* multiple TFS Resp IE (assuming consecutive) */
257 const u8 *tfsresp_ie_start = NULL;
258 const u8 *tfsresp_ie_end = NULL;
259 size_t left;
260
261 if (!wpa_s->wnmsleep_used) {
262 wpa_printf(MSG_DEBUG,
263 "WNM: Ignore WNM-Sleep Mode Response frame since WNM-Sleep Mode operation has not been requested");
264 return;
265 }
266
267 if (len < 3)
268 return;
269 key_len_total = WPA_GET_LE16(frm + 1);
270
271 wpa_printf(MSG_DEBUG, "WNM-Sleep Mode Response token=%u key_len_total=%d",
272 frm[0], key_len_total);
273 left = len - 3;
274 if (key_len_total > left) {
275 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
276 return;
277 }
278 pos += 3 + key_len_total;
279 while (pos - frm + 1 < len) {
280 u8 ie_len = *(pos + 1);
281 if (2 + ie_len > frm + len - pos) {
282 wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
283 break;
284 }
285 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
286 if (*pos == WLAN_EID_WNMSLEEP && ie_len >= 4)
287 wnmsleep_ie = (struct wnm_sleep_element *) pos;
288 else if (*pos == WLAN_EID_TFS_RESP) {
289 if (!tfsresp_ie_start)
290 tfsresp_ie_start = pos;
291 tfsresp_ie_end = pos;
292 } else
293 wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
294 pos += ie_len + 2;
295 }
296
297 if (!wnmsleep_ie) {
298 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
299 return;
300 }
301
302 wpa_s->wnmsleep_used = 0;
303
304 if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
305 wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
306 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
307 "frame (action=%d, intval=%d)",
308 wnmsleep_ie->action_type, wnmsleep_ie->intval);
309 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
310 wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
311 tfsresp_ie_end);
312 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
313 wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
314 }
315 } else {
316 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
317 "(action=%d, intval=%d)",
318 wnmsleep_ie->action_type, wnmsleep_ie->intval);
319 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
320 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
321 wpa_s->bssid, NULL, NULL);
322 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
323 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
324 wpa_s->bssid, NULL, NULL);
325 }
326 }
327
328
wnm_deallocate_memory(struct wpa_supplicant * wpa_s)329 void wnm_deallocate_memory(struct wpa_supplicant *wpa_s)
330 {
331 int i;
332
333 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
334 os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot);
335 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid);
336 }
337
338 wpa_s->wnm_num_neighbor_report = 0;
339 os_free(wpa_s->wnm_neighbor_report_elements);
340 wpa_s->wnm_neighbor_report_elements = NULL;
341 }
342
343
wnm_parse_neighbor_report_elem(struct neighbor_report * rep,u8 id,u8 elen,const u8 * pos)344 static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep,
345 u8 id, u8 elen, const u8 *pos)
346 {
347 switch (id) {
348 case WNM_NEIGHBOR_TSF:
349 if (elen < 2 + 2) {
350 wpa_printf(MSG_DEBUG, "WNM: Too short TSF");
351 break;
352 }
353 rep->tsf_offset = WPA_GET_LE16(pos);
354 rep->beacon_int = WPA_GET_LE16(pos + 2);
355 rep->tsf_present = 1;
356 break;
357 case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
358 if (elen < 2) {
359 wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
360 "country string");
361 break;
362 }
363 os_memcpy(rep->country, pos, 2);
364 rep->country_present = 1;
365 break;
366 case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
367 if (elen < 1) {
368 wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
369 "candidate");
370 break;
371 }
372 rep->preference = pos[0];
373 rep->preference_present = 1;
374 break;
375 case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
376 rep->bss_term_tsf = WPA_GET_LE64(pos);
377 rep->bss_term_dur = WPA_GET_LE16(pos + 8);
378 rep->bss_term_present = 1;
379 break;
380 case WNM_NEIGHBOR_BEARING:
381 if (elen < 8) {
382 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
383 "bearing");
384 break;
385 }
386 rep->bearing = WPA_GET_LE16(pos);
387 rep->distance = WPA_GET_LE32(pos + 2);
388 rep->rel_height = WPA_GET_LE16(pos + 2 + 4);
389 rep->bearing_present = 1;
390 break;
391 case WNM_NEIGHBOR_MEASUREMENT_PILOT:
392 if (elen < 1) {
393 wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
394 "pilot");
395 break;
396 }
397 os_free(rep->meas_pilot);
398 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
399 if (rep->meas_pilot == NULL)
400 break;
401 rep->meas_pilot->measurement_pilot = pos[0];
402 rep->meas_pilot->subelem_len = elen - 1;
403 os_memcpy(rep->meas_pilot->subelems, pos + 1, elen - 1);
404 break;
405 case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
406 if (elen < 5) {
407 wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
408 "capabilities");
409 break;
410 }
411 os_memcpy(rep->rm_capab, pos, 5);
412 rep->rm_capab_present = 1;
413 break;
414 case WNM_NEIGHBOR_MULTIPLE_BSSID:
415 if (elen < 1) {
416 wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
417 break;
418 }
419 os_free(rep->mul_bssid);
420 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
421 if (rep->mul_bssid == NULL)
422 break;
423 rep->mul_bssid->max_bssid_indicator = pos[0];
424 rep->mul_bssid->subelem_len = elen - 1;
425 os_memcpy(rep->mul_bssid->subelems, pos + 1, elen - 1);
426 break;
427 }
428 }
429
430
wnm_nei_get_chan(struct wpa_supplicant * wpa_s,u8 op_class,u8 chan)431 static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan)
432 {
433 struct wpa_bss *bss = wpa_s->current_bss;
434 const char *country = NULL;
435 int freq;
436
437 if (bss) {
438 const u8 *elem = wpa_bss_get_ie(bss, WLAN_EID_COUNTRY);
439
440 if (elem && elem[1] >= 2)
441 country = (const char *) (elem + 2);
442 }
443
444 freq = ieee80211_chan_to_freq(country, op_class, chan);
445 if (freq <= 0 && op_class == 0) {
446 /*
447 * Some APs do not advertise correct operating class
448 * information. Try to determine the most likely operating
449 * frequency based on the channel number.
450 */
451 if (chan >= 1 && chan <= 13)
452 freq = 2407 + chan * 5;
453 else if (chan == 14)
454 freq = 2484;
455 else if (chan >= 36 && chan <= 169)
456 freq = 5000 + chan * 5;
457 }
458 return freq;
459 }
460
461
wnm_parse_neighbor_report(struct wpa_supplicant * wpa_s,const u8 * pos,u8 len,struct neighbor_report * rep)462 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
463 const u8 *pos, u8 len,
464 struct neighbor_report *rep)
465 {
466 u8 left = len;
467
468 if (left < 13) {
469 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
470 return;
471 }
472
473 os_memcpy(rep->bssid, pos, ETH_ALEN);
474 rep->bssid_info = WPA_GET_LE32(pos + ETH_ALEN);
475 rep->regulatory_class = *(pos + 10);
476 rep->channel_number = *(pos + 11);
477 rep->phy_type = *(pos + 12);
478
479 pos += 13;
480 left -= 13;
481
482 while (left >= 2) {
483 u8 id, elen;
484
485 id = *pos++;
486 elen = *pos++;
487 wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen);
488 left -= 2;
489 if (elen > left) {
490 wpa_printf(MSG_DEBUG,
491 "WNM: Truncated neighbor report subelement");
492 break;
493 }
494 wnm_parse_neighbor_report_elem(rep, id, elen, pos);
495 left -= elen;
496 pos += elen;
497 }
498
499 rep->freq = wnm_nei_get_chan(wpa_s, rep->regulatory_class,
500 rep->channel_number);
501 }
502
503
wnm_clear_acceptable(struct wpa_supplicant * wpa_s)504 static void wnm_clear_acceptable(struct wpa_supplicant *wpa_s)
505 {
506 unsigned int i;
507
508 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++)
509 wpa_s->wnm_neighbor_report_elements[i].acceptable = 0;
510 }
511
512
get_first_acceptable(struct wpa_supplicant * wpa_s)513 static struct wpa_bss * get_first_acceptable(struct wpa_supplicant *wpa_s)
514 {
515 unsigned int i;
516 struct neighbor_report *nei;
517
518 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
519 nei = &wpa_s->wnm_neighbor_report_elements[i];
520 if (nei->acceptable)
521 return wpa_bss_get_bssid(wpa_s, nei->bssid);
522 }
523
524 return NULL;
525 }
526
527
528 #ifdef CONFIG_MBO
529 static struct wpa_bss *
get_mbo_transition_candidate(struct wpa_supplicant * wpa_s,enum mbo_transition_reject_reason * reason)530 get_mbo_transition_candidate(struct wpa_supplicant *wpa_s,
531 enum mbo_transition_reject_reason *reason)
532 {
533 struct wpa_bss *target = NULL;
534 struct wpa_bss_trans_info params;
535 struct wpa_bss_candidate_info *info = NULL;
536 struct neighbor_report *nei = wpa_s->wnm_neighbor_report_elements;
537 u8 *first_candidate_bssid = NULL, *pos;
538 unsigned int i;
539
540 params.mbo_transition_reason = wpa_s->wnm_mbo_transition_reason;
541 params.n_candidates = 0;
542 params.bssid = os_calloc(wpa_s->wnm_num_neighbor_report, ETH_ALEN);
543 if (!params.bssid)
544 return NULL;
545
546 pos = params.bssid;
547 for (i = 0; i < wpa_s->wnm_num_neighbor_report; nei++, i++) {
548 if (nei->is_first)
549 first_candidate_bssid = nei->bssid;
550 if (!nei->acceptable)
551 continue;
552 os_memcpy(pos, nei->bssid, ETH_ALEN);
553 pos += ETH_ALEN;
554 params.n_candidates++;
555 }
556
557 if (!params.n_candidates)
558 goto end;
559
560 info = wpa_drv_get_bss_trans_status(wpa_s, ¶ms);
561 if (!info) {
562 /* If failed to get candidate BSS transition status from driver,
563 * get the first acceptable candidate from wpa_supplicant.
564 */
565 target = wpa_bss_get_bssid(wpa_s, params.bssid);
566 goto end;
567 }
568
569 /* Get the first acceptable candidate from driver */
570 for (i = 0; i < info->num; i++) {
571 if (info->candidates[i].is_accept) {
572 target = wpa_bss_get_bssid(wpa_s,
573 info->candidates[i].bssid);
574 goto end;
575 }
576 }
577
578 /* If Disassociation Imminent is set and driver rejects all the
579 * candidate select first acceptable candidate which has
580 * rssi > disassoc_imminent_rssi_threshold
581 */
582 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
583 for (i = 0; i < info->num; i++) {
584 target = wpa_bss_get_bssid(wpa_s,
585 info->candidates[i].bssid);
586 if (target &&
587 (target->level <
588 wpa_s->conf->disassoc_imminent_rssi_threshold))
589 continue;
590 goto end;
591 }
592 }
593
594 /* While sending BTM reject use reason code of the first candidate
595 * received in BTM request frame
596 */
597 if (reason) {
598 for (i = 0; i < info->num; i++) {
599 if (first_candidate_bssid &&
600 os_memcmp(first_candidate_bssid,
601 info->candidates[i].bssid, ETH_ALEN) == 0)
602 {
603 *reason = info->candidates[i].reject_reason;
604 break;
605 }
606 }
607 }
608
609 target = NULL;
610
611 end:
612 os_free(params.bssid);
613 if (info) {
614 os_free(info->candidates);
615 os_free(info);
616 }
617 return target;
618 }
619 #endif /* CONFIG_MBO */
620
621
622 static struct wpa_bss *
compare_scan_neighbor_results(struct wpa_supplicant * wpa_s,os_time_t age_secs,enum mbo_transition_reject_reason * reason)623 compare_scan_neighbor_results(struct wpa_supplicant *wpa_s, os_time_t age_secs,
624 enum mbo_transition_reject_reason *reason)
625 {
626 u8 i;
627 struct wpa_bss *bss = wpa_s->current_bss;
628 struct wpa_bss *target;
629
630 if (!bss)
631 return NULL;
632
633 wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
634 MAC2STR(wpa_s->bssid), bss->level);
635
636 wnm_clear_acceptable(wpa_s);
637
638 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
639 struct neighbor_report *nei;
640
641 nei = &wpa_s->wnm_neighbor_report_elements[i];
642 if (nei->preference_present && nei->preference == 0) {
643 wpa_printf(MSG_DEBUG, "Skip excluded BSS " MACSTR,
644 MAC2STR(nei->bssid));
645 continue;
646 }
647
648 target = wpa_bss_get_bssid(wpa_s, nei->bssid);
649 if (!target) {
650 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
651 " (pref %d) not found in scan results",
652 MAC2STR(nei->bssid),
653 nei->preference_present ? nei->preference :
654 -1);
655 continue;
656 }
657
658 if (age_secs) {
659 struct os_reltime now;
660
661 if (os_get_reltime(&now) == 0 &&
662 os_reltime_expired(&now, &target->last_update,
663 age_secs)) {
664 wpa_printf(MSG_DEBUG,
665 "Candidate BSS is more than %ld seconds old",
666 age_secs);
667 continue;
668 }
669 }
670
671 if (bss->ssid_len != target->ssid_len ||
672 os_memcmp(bss->ssid, target->ssid, bss->ssid_len) != 0) {
673 /*
674 * TODO: Could consider allowing transition to another
675 * ESS if PMF was enabled for the association.
676 */
677 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
678 " (pref %d) in different ESS",
679 MAC2STR(nei->bssid),
680 nei->preference_present ? nei->preference :
681 -1);
682 continue;
683 }
684
685 if (wpa_s->current_ssid &&
686 !wpa_scan_res_match(wpa_s, 0, target, wpa_s->current_ssid,
687 1, 0)) {
688 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
689 " (pref %d) does not match the current network profile",
690 MAC2STR(nei->bssid),
691 nei->preference_present ? nei->preference :
692 -1);
693 continue;
694 }
695
696 if (wpa_is_bss_tmp_disallowed(wpa_s, target->bssid)) {
697 wpa_printf(MSG_DEBUG,
698 "MBO: Candidate BSS " MACSTR
699 " retry delay is not over yet",
700 MAC2STR(nei->bssid));
701 continue;
702 }
703
704 if (target->level < bss->level && target->level < -80) {
705 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
706 " (pref %d) does not have sufficient signal level (%d)",
707 MAC2STR(nei->bssid),
708 nei->preference_present ? nei->preference :
709 -1,
710 target->level);
711 continue;
712 }
713
714 nei->acceptable = 1;
715 }
716
717 #ifdef CONFIG_MBO
718 if (wpa_s->wnm_mbo_trans_reason_present)
719 target = get_mbo_transition_candidate(wpa_s, reason);
720 else
721 target = get_first_acceptable(wpa_s);
722 #else /* CONFIG_MBO */
723 target = get_first_acceptable(wpa_s);
724 #endif /* CONFIG_MBO */
725
726 if (target) {
727 wpa_printf(MSG_DEBUG,
728 "WNM: Found an acceptable preferred transition candidate BSS "
729 MACSTR " (RSSI %d)",
730 MAC2STR(target->bssid), target->level);
731 }
732
733 return target;
734 }
735
736
wpa_bss_ies_eq(struct wpa_bss * a,struct wpa_bss * b,u8 eid)737 static int wpa_bss_ies_eq(struct wpa_bss *a, struct wpa_bss *b, u8 eid)
738 {
739 const u8 *ie_a, *ie_b;
740
741 if (!a || !b)
742 return 0;
743
744 ie_a = wpa_bss_get_ie(a, eid);
745 ie_b = wpa_bss_get_ie(b, eid);
746
747 if (!ie_a || !ie_b || ie_a[1] != ie_b[1])
748 return 0;
749
750 return os_memcmp(ie_a, ie_b, ie_a[1]) == 0;
751 }
752
753
wnm_get_bss_info(struct wpa_supplicant * wpa_s,struct wpa_bss * bss)754 static u32 wnm_get_bss_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
755 {
756 u32 info = 0;
757
758 info |= NEI_REP_BSSID_INFO_AP_UNKNOWN_REACH;
759
760 /*
761 * Leave the security and key scope bits unset to indicate that the
762 * security information is not available.
763 */
764
765 if (bss->caps & WLAN_CAPABILITY_SPECTRUM_MGMT)
766 info |= NEI_REP_BSSID_INFO_SPECTRUM_MGMT;
767 if (bss->caps & WLAN_CAPABILITY_QOS)
768 info |= NEI_REP_BSSID_INFO_QOS;
769 if (bss->caps & WLAN_CAPABILITY_APSD)
770 info |= NEI_REP_BSSID_INFO_APSD;
771 if (bss->caps & WLAN_CAPABILITY_RADIO_MEASUREMENT)
772 info |= NEI_REP_BSSID_INFO_RM;
773 if (bss->caps & WLAN_CAPABILITY_DELAYED_BLOCK_ACK)
774 info |= NEI_REP_BSSID_INFO_DELAYED_BA;
775 if (bss->caps & WLAN_CAPABILITY_IMM_BLOCK_ACK)
776 info |= NEI_REP_BSSID_INFO_IMM_BA;
777 if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_MOBILITY_DOMAIN))
778 info |= NEI_REP_BSSID_INFO_MOBILITY_DOMAIN;
779 if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_HT_CAP))
780 info |= NEI_REP_BSSID_INFO_HT;
781
782 return info;
783 }
784
785
wnm_add_nei_rep(struct wpabuf ** buf,const u8 * bssid,u32 bss_info,u8 op_class,u8 chan,u8 phy_type,u8 pref)786 static int wnm_add_nei_rep(struct wpabuf **buf, const u8 *bssid,
787 u32 bss_info, u8 op_class, u8 chan, u8 phy_type,
788 u8 pref)
789 {
790 if (wpabuf_len(*buf) + 18 >
791 IEEE80211_MAX_MMPDU_SIZE - IEEE80211_HDRLEN) {
792 wpa_printf(MSG_DEBUG,
793 "WNM: No room in frame for Neighbor Report element");
794 return -1;
795 }
796
797 if (wpabuf_resize(buf, 18) < 0) {
798 wpa_printf(MSG_DEBUG,
799 "WNM: Failed to allocate memory for Neighbor Report element");
800 return -1;
801 }
802
803 wpabuf_put_u8(*buf, WLAN_EID_NEIGHBOR_REPORT);
804 /* length: 13 for basic neighbor report + 3 for preference subelement */
805 wpabuf_put_u8(*buf, 16);
806 wpabuf_put_data(*buf, bssid, ETH_ALEN);
807 wpabuf_put_le32(*buf, bss_info);
808 wpabuf_put_u8(*buf, op_class);
809 wpabuf_put_u8(*buf, chan);
810 wpabuf_put_u8(*buf, phy_type);
811 wpabuf_put_u8(*buf, WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE);
812 wpabuf_put_u8(*buf, 1);
813 wpabuf_put_u8(*buf, pref);
814 return 0;
815 }
816
817
wnm_nei_rep_add_bss(struct wpa_supplicant * wpa_s,struct wpa_bss * bss,struct wpabuf ** buf,u8 pref)818 static int wnm_nei_rep_add_bss(struct wpa_supplicant *wpa_s,
819 struct wpa_bss *bss, struct wpabuf **buf,
820 u8 pref)
821 {
822 const u8 *ie;
823 u8 op_class, chan;
824 int sec_chan = 0, vht = 0;
825 enum phy_type phy_type;
826 u32 info;
827 struct ieee80211_ht_operation *ht_oper = NULL;
828 struct ieee80211_vht_operation *vht_oper = NULL;
829
830 ie = wpa_bss_get_ie(bss, WLAN_EID_HT_OPERATION);
831 if (ie && ie[1] >= 2) {
832 ht_oper = (struct ieee80211_ht_operation *) (ie + 2);
833
834 if (ht_oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
835 sec_chan = 1;
836 else if (ht_oper->ht_param &
837 HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
838 sec_chan = -1;
839 }
840
841 ie = wpa_bss_get_ie(bss, WLAN_EID_VHT_OPERATION);
842 if (ie && ie[1] >= 1) {
843 vht_oper = (struct ieee80211_vht_operation *) (ie + 2);
844
845 if (vht_oper->vht_op_info_chwidth == VHT_CHANWIDTH_80MHZ ||
846 vht_oper->vht_op_info_chwidth == VHT_CHANWIDTH_160MHZ ||
847 vht_oper->vht_op_info_chwidth == VHT_CHANWIDTH_80P80MHZ)
848 vht = vht_oper->vht_op_info_chwidth;
849 }
850
851 if (ieee80211_freq_to_channel_ext(bss->freq, sec_chan, vht, &op_class,
852 &chan) == NUM_HOSTAPD_MODES) {
853 wpa_printf(MSG_DEBUG,
854 "WNM: Cannot determine operating class and channel");
855 return -2;
856 }
857
858 phy_type = ieee80211_get_phy_type(bss->freq, (ht_oper != NULL),
859 (vht_oper != NULL));
860 if (phy_type == PHY_TYPE_UNSPECIFIED) {
861 wpa_printf(MSG_DEBUG,
862 "WNM: Cannot determine BSS phy type for Neighbor Report");
863 return -2;
864 }
865
866 info = wnm_get_bss_info(wpa_s, bss);
867
868 return wnm_add_nei_rep(buf, bss->bssid, info, op_class, chan, phy_type,
869 pref);
870 }
871
872
wnm_add_cand_list(struct wpa_supplicant * wpa_s,struct wpabuf ** buf)873 static void wnm_add_cand_list(struct wpa_supplicant *wpa_s, struct wpabuf **buf)
874 {
875 unsigned int i, pref = 255;
876 struct os_reltime now;
877 struct wpa_ssid *ssid = wpa_s->current_ssid;
878
879 if (!ssid)
880 return;
881
882 /*
883 * TODO: Define when scan results are no longer valid for the candidate
884 * list.
885 */
886 os_get_reltime(&now);
887 if (os_reltime_expired(&now, &wpa_s->last_scan, 10))
888 return;
889
890 wpa_printf(MSG_DEBUG,
891 "WNM: Add candidate list to BSS Transition Management Response frame");
892 for (i = 0; i < wpa_s->last_scan_res_used && pref; i++) {
893 struct wpa_bss *bss = wpa_s->last_scan_res[i];
894 int res;
895
896 if (wpa_scan_res_match(wpa_s, i, bss, ssid, 1, 0)) {
897 res = wnm_nei_rep_add_bss(wpa_s, bss, buf, pref--);
898 if (res == -2)
899 continue; /* could not build entry for BSS */
900 if (res < 0)
901 break; /* no more room for candidates */
902 if (pref == 1)
903 break;
904 }
905 }
906
907 wpa_hexdump_buf(MSG_DEBUG,
908 "WNM: BSS Transition Management Response candidate list",
909 *buf);
910 }
911
912
913 #define BTM_RESP_MIN_SIZE 5 + ETH_ALEN
914
wnm_send_bss_transition_mgmt_resp(struct wpa_supplicant * wpa_s,u8 dialog_token,enum bss_trans_mgmt_status_code status,enum mbo_transition_reject_reason reason,u8 delay,const u8 * target_bssid)915 static void wnm_send_bss_transition_mgmt_resp(
916 struct wpa_supplicant *wpa_s, u8 dialog_token,
917 enum bss_trans_mgmt_status_code status,
918 enum mbo_transition_reject_reason reason,
919 u8 delay, const u8 *target_bssid)
920 {
921 struct wpabuf *buf;
922 int res;
923
924 wpa_printf(MSG_DEBUG,
925 "WNM: Send BSS Transition Management Response to " MACSTR
926 " dialog_token=%u status=%u reason=%u delay=%d",
927 MAC2STR(wpa_s->bssid), dialog_token, status, reason, delay);
928 if (!wpa_s->current_bss) {
929 wpa_printf(MSG_DEBUG,
930 "WNM: Current BSS not known - drop response");
931 return;
932 }
933
934 buf = wpabuf_alloc(BTM_RESP_MIN_SIZE);
935 if (!buf) {
936 wpa_printf(MSG_DEBUG,
937 "WNM: Failed to allocate memory for BTM response");
938 return;
939 }
940
941 wpabuf_put_u8(buf, WLAN_ACTION_WNM);
942 wpabuf_put_u8(buf, WNM_BSS_TRANS_MGMT_RESP);
943 wpabuf_put_u8(buf, dialog_token);
944 wpabuf_put_u8(buf, status);
945 wpabuf_put_u8(buf, delay);
946 if (target_bssid) {
947 wpabuf_put_data(buf, target_bssid, ETH_ALEN);
948 } else if (status == WNM_BSS_TM_ACCEPT) {
949 /*
950 * P802.11-REVmc clarifies that the Target BSSID field is always
951 * present when status code is zero, so use a fake value here if
952 * no BSSID is yet known.
953 */
954 wpabuf_put_data(buf, "\0\0\0\0\0\0", ETH_ALEN);
955 }
956
957 if (status == WNM_BSS_TM_ACCEPT)
958 wnm_add_cand_list(wpa_s, &buf);
959
960 #ifdef CONFIG_MBO
961 if (status != WNM_BSS_TM_ACCEPT &&
962 wpa_bss_get_vendor_ie(wpa_s->current_bss, MBO_IE_VENDOR_TYPE)) {
963 u8 mbo[10];
964 size_t ret;
965
966 ret = wpas_mbo_ie_bss_trans_reject(wpa_s, mbo, sizeof(mbo),
967 reason);
968 if (ret) {
969 if (wpabuf_resize(&buf, ret) < 0) {
970 wpabuf_free(buf);
971 wpa_printf(MSG_DEBUG,
972 "WNM: Failed to allocate memory for MBO IE");
973 return;
974 }
975
976 wpabuf_put_data(buf, mbo, ret);
977 }
978 }
979 #endif /* CONFIG_MBO */
980
981 res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
982 wpa_s->own_addr, wpa_s->bssid,
983 wpabuf_head_u8(buf), wpabuf_len(buf), 0);
984 if (res < 0) {
985 wpa_printf(MSG_DEBUG,
986 "WNM: Failed to send BSS Transition Management Response");
987 }
988
989 wpabuf_free(buf);
990 }
991
992
wnm_bss_tm_connect(struct wpa_supplicant * wpa_s,struct wpa_bss * bss,struct wpa_ssid * ssid,int after_new_scan)993 static void wnm_bss_tm_connect(struct wpa_supplicant *wpa_s,
994 struct wpa_bss *bss, struct wpa_ssid *ssid,
995 int after_new_scan)
996 {
997 wpa_dbg(wpa_s, MSG_DEBUG,
998 "WNM: Transition to BSS " MACSTR
999 " based on BSS Transition Management Request (old BSSID "
1000 MACSTR " after_new_scan=%d)",
1001 MAC2STR(bss->bssid), MAC2STR(wpa_s->bssid), after_new_scan);
1002
1003 /* Send the BSS Management Response - Accept */
1004 if (wpa_s->wnm_reply) {
1005 wpa_s->wnm_reply = 0;
1006 wpa_printf(MSG_DEBUG,
1007 "WNM: Sending successful BSS Transition Management Response");
1008 wnm_send_bss_transition_mgmt_resp(
1009 wpa_s, wpa_s->wnm_dialog_token, WNM_BSS_TM_ACCEPT,
1010 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
1011 bss->bssid);
1012 }
1013
1014 if (bss == wpa_s->current_bss) {
1015 wpa_printf(MSG_DEBUG,
1016 "WNM: Already associated with the preferred candidate");
1017 wnm_deallocate_memory(wpa_s);
1018 return;
1019 }
1020
1021 wpa_s->reassociate = 1;
1022 wpa_printf(MSG_DEBUG, "WNM: Issuing connect");
1023 wpa_supplicant_connect(wpa_s, bss, ssid);
1024 wnm_deallocate_memory(wpa_s);
1025 }
1026
1027
wnm_scan_process(struct wpa_supplicant * wpa_s,int reply_on_fail)1028 int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail)
1029 {
1030 struct wpa_bss *bss;
1031 struct wpa_ssid *ssid = wpa_s->current_ssid;
1032 enum bss_trans_mgmt_status_code status = WNM_BSS_TM_REJECT_UNSPECIFIED;
1033 enum mbo_transition_reject_reason reason =
1034 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED;
1035
1036 if (!wpa_s->wnm_neighbor_report_elements)
1037 return 0;
1038
1039 wpa_dbg(wpa_s, MSG_DEBUG,
1040 "WNM: Process scan results for BSS Transition Management");
1041 if (os_reltime_before(&wpa_s->wnm_cand_valid_until,
1042 &wpa_s->scan_trigger_time)) {
1043 wpa_printf(MSG_DEBUG, "WNM: Previously stored BSS transition candidate list is not valid anymore - drop it");
1044 wnm_deallocate_memory(wpa_s);
1045 return 0;
1046 }
1047
1048 if (!wpa_s->current_bss ||
1049 os_memcmp(wpa_s->wnm_cand_from_bss, wpa_s->current_bss->bssid,
1050 ETH_ALEN) != 0) {
1051 wpa_printf(MSG_DEBUG, "WNM: Stored BSS transition candidate list not from the current BSS - ignore it");
1052 return 0;
1053 }
1054
1055 /* Compare the Neighbor Report and scan results */
1056 bss = compare_scan_neighbor_results(wpa_s, 0, &reason);
1057 if (!bss) {
1058 wpa_printf(MSG_DEBUG, "WNM: No BSS transition candidate match found");
1059 status = WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES;
1060 goto send_bss_resp_fail;
1061 }
1062
1063 /* Associate to the network */
1064 wnm_bss_tm_connect(wpa_s, bss, ssid, 1);
1065 return 1;
1066
1067 send_bss_resp_fail:
1068 if (!reply_on_fail)
1069 return 0;
1070
1071 /* Send reject response for all the failures */
1072
1073 if (wpa_s->wnm_reply) {
1074 wpa_s->wnm_reply = 0;
1075 wnm_send_bss_transition_mgmt_resp(wpa_s,
1076 wpa_s->wnm_dialog_token,
1077 status, reason, 0, NULL);
1078 }
1079 wnm_deallocate_memory(wpa_s);
1080
1081 return 0;
1082 }
1083
1084
cand_pref_compar(const void * a,const void * b)1085 static int cand_pref_compar(const void *a, const void *b)
1086 {
1087 const struct neighbor_report *aa = a;
1088 const struct neighbor_report *bb = b;
1089
1090 if (!aa->preference_present && !bb->preference_present)
1091 return 0;
1092 if (!aa->preference_present)
1093 return 1;
1094 if (!bb->preference_present)
1095 return -1;
1096 if (bb->preference > aa->preference)
1097 return 1;
1098 if (bb->preference < aa->preference)
1099 return -1;
1100 return 0;
1101 }
1102
1103
wnm_sort_cand_list(struct wpa_supplicant * wpa_s)1104 static void wnm_sort_cand_list(struct wpa_supplicant *wpa_s)
1105 {
1106 if (!wpa_s->wnm_neighbor_report_elements)
1107 return;
1108 qsort(wpa_s->wnm_neighbor_report_elements,
1109 wpa_s->wnm_num_neighbor_report, sizeof(struct neighbor_report),
1110 cand_pref_compar);
1111 }
1112
1113
wnm_dump_cand_list(struct wpa_supplicant * wpa_s)1114 static void wnm_dump_cand_list(struct wpa_supplicant *wpa_s)
1115 {
1116 unsigned int i;
1117
1118 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Candidate List");
1119 if (!wpa_s->wnm_neighbor_report_elements)
1120 return;
1121 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
1122 struct neighbor_report *nei;
1123
1124 nei = &wpa_s->wnm_neighbor_report_elements[i];
1125 wpa_printf(MSG_DEBUG, "%u: " MACSTR
1126 " info=0x%x op_class=%u chan=%u phy=%u pref=%d freq=%d",
1127 i, MAC2STR(nei->bssid), nei->bssid_info,
1128 nei->regulatory_class,
1129 nei->channel_number, nei->phy_type,
1130 nei->preference_present ? nei->preference : -1,
1131 nei->freq);
1132 }
1133 }
1134
1135
chan_supported(struct wpa_supplicant * wpa_s,int freq)1136 static int chan_supported(struct wpa_supplicant *wpa_s, int freq)
1137 {
1138 unsigned int i;
1139
1140 for (i = 0; i < wpa_s->hw.num_modes; i++) {
1141 struct hostapd_hw_modes *mode = &wpa_s->hw.modes[i];
1142 int j;
1143
1144 for (j = 0; j < mode->num_channels; j++) {
1145 struct hostapd_channel_data *chan;
1146
1147 chan = &mode->channels[j];
1148 if (chan->freq == freq &&
1149 !(chan->flag & HOSTAPD_CHAN_DISABLED))
1150 return 1;
1151 }
1152 }
1153
1154 return 0;
1155 }
1156
1157
wnm_set_scan_freqs(struct wpa_supplicant * wpa_s)1158 static void wnm_set_scan_freqs(struct wpa_supplicant *wpa_s)
1159 {
1160 int *freqs;
1161 int num_freqs = 0;
1162 unsigned int i;
1163
1164 if (!wpa_s->wnm_neighbor_report_elements)
1165 return;
1166
1167 if (wpa_s->hw.modes == NULL)
1168 return;
1169
1170 os_free(wpa_s->next_scan_freqs);
1171 wpa_s->next_scan_freqs = NULL;
1172
1173 freqs = os_calloc(wpa_s->wnm_num_neighbor_report + 1, sizeof(int));
1174 if (freqs == NULL)
1175 return;
1176
1177 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
1178 struct neighbor_report *nei;
1179
1180 nei = &wpa_s->wnm_neighbor_report_elements[i];
1181 if (nei->freq <= 0) {
1182 wpa_printf(MSG_DEBUG,
1183 "WNM: Unknown neighbor operating frequency for "
1184 MACSTR " - scan all channels",
1185 MAC2STR(nei->bssid));
1186 os_free(freqs);
1187 return;
1188 }
1189 if (chan_supported(wpa_s, nei->freq))
1190 add_freq(freqs, &num_freqs, nei->freq);
1191 }
1192
1193 if (num_freqs == 0) {
1194 os_free(freqs);
1195 return;
1196 }
1197
1198 wpa_printf(MSG_DEBUG,
1199 "WNM: Scan %d frequencies based on transition candidate list",
1200 num_freqs);
1201 wpa_s->next_scan_freqs = freqs;
1202 }
1203
1204
wnm_fetch_scan_results(struct wpa_supplicant * wpa_s)1205 static int wnm_fetch_scan_results(struct wpa_supplicant *wpa_s)
1206 {
1207 struct wpa_scan_results *scan_res;
1208 struct wpa_bss *bss;
1209 struct wpa_ssid *ssid = wpa_s->current_ssid;
1210 u8 i, found = 0;
1211 size_t j;
1212
1213 wpa_dbg(wpa_s, MSG_DEBUG,
1214 "WNM: Fetch current scan results from the driver for checking transition candidates");
1215 scan_res = wpa_drv_get_scan_results2(wpa_s);
1216 if (!scan_res) {
1217 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Failed to get scan results");
1218 return 0;
1219 }
1220
1221 if (scan_res->fetch_time.sec == 0)
1222 os_get_reltime(&scan_res->fetch_time);
1223
1224 filter_scan_res(wpa_s, scan_res);
1225
1226 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
1227 struct neighbor_report *nei;
1228
1229 nei = &wpa_s->wnm_neighbor_report_elements[i];
1230 if (nei->preference_present && nei->preference == 0)
1231 continue;
1232
1233 for (j = 0; j < scan_res->num; j++) {
1234 struct wpa_scan_res *res;
1235 const u8 *ssid_ie;
1236
1237 res = scan_res->res[j];
1238 if (os_memcmp(nei->bssid, res->bssid, ETH_ALEN) != 0 ||
1239 res->age > WNM_SCAN_RESULT_AGE * 1000)
1240 continue;
1241 bss = wpa_s->current_bss;
1242 ssid_ie = wpa_scan_get_ie(res, WLAN_EID_SSID);
1243 if (bss && ssid_ie &&
1244 (bss->ssid_len != ssid_ie[1] ||
1245 os_memcmp(bss->ssid, ssid_ie + 2,
1246 bss->ssid_len) != 0))
1247 continue;
1248
1249 /* Potential candidate found */
1250 found = 1;
1251 scan_snr(res);
1252 scan_est_throughput(wpa_s, res);
1253 wpa_bss_update_scan_res(wpa_s, res,
1254 &scan_res->fetch_time);
1255 }
1256 }
1257
1258 wpa_scan_results_free(scan_res);
1259 if (!found) {
1260 wpa_dbg(wpa_s, MSG_DEBUG,
1261 "WNM: No transition candidate matches existing scan results");
1262 return 0;
1263 }
1264
1265 bss = compare_scan_neighbor_results(wpa_s, WNM_SCAN_RESULT_AGE, NULL);
1266 if (!bss) {
1267 wpa_dbg(wpa_s, MSG_DEBUG,
1268 "WNM: Comparison of scan results against transition candidates did not find matches");
1269 return 0;
1270 }
1271
1272 /* Associate to the network */
1273 wnm_bss_tm_connect(wpa_s, bss, ssid, 0);
1274 return 1;
1275 }
1276
1277
ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant * wpa_s,const u8 * pos,const u8 * end,int reply)1278 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
1279 const u8 *pos, const u8 *end,
1280 int reply)
1281 {
1282 unsigned int beacon_int;
1283 u8 valid_int;
1284 #ifdef CONFIG_MBO
1285 const u8 *vendor;
1286 #endif /* CONFIG_MBO */
1287
1288 if (end - pos < 5)
1289 return;
1290
1291 #ifdef CONFIG_MBO
1292 wpa_s->wnm_mbo_trans_reason_present = 0;
1293 wpa_s->wnm_mbo_transition_reason = 0;
1294 #endif /* CONFIG_MBO */
1295
1296 if (wpa_s->current_bss)
1297 beacon_int = wpa_s->current_bss->beacon_int;
1298 else
1299 beacon_int = 100; /* best guess */
1300
1301 wpa_s->wnm_dialog_token = pos[0];
1302 wpa_s->wnm_mode = pos[1];
1303 wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
1304 valid_int = pos[4];
1305 wpa_s->wnm_reply = reply;
1306
1307 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
1308 "dialog_token=%u request_mode=0x%x "
1309 "disassoc_timer=%u validity_interval=%u",
1310 wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
1311 wpa_s->wnm_dissoc_timer, valid_int);
1312
1313 #if defined(CONFIG_MBO) && defined(CONFIG_TESTING_OPTIONS)
1314 if (wpa_s->reject_btm_req_reason) {
1315 wpa_printf(MSG_INFO,
1316 "WNM: Testing - reject BSS Transition Management Request: reject_btm_req_reason=%d",
1317 wpa_s->reject_btm_req_reason);
1318 wnm_send_bss_transition_mgmt_resp(
1319 wpa_s, wpa_s->wnm_dialog_token,
1320 wpa_s->reject_btm_req_reason,
1321 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0, NULL);
1322 return;
1323 }
1324 #endif /* CONFIG_MBO && CONFIG_TESTING_OPTIONS */
1325
1326 pos += 5;
1327
1328 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
1329 if (end - pos < 12) {
1330 wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
1331 return;
1332 }
1333 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
1334 pos += 12; /* BSS Termination Duration */
1335 }
1336
1337 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
1338 char url[256];
1339
1340 if (end - pos < 1 || 1 + pos[0] > end - pos) {
1341 wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
1342 "Management Request (URL)");
1343 return;
1344 }
1345 os_memcpy(url, pos + 1, pos[0]);
1346 url[pos[0]] = '\0';
1347 pos += 1 + pos[0];
1348
1349 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
1350 wpa_sm_pmf_enabled(wpa_s->wpa),
1351 wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
1352 }
1353
1354 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
1355 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
1356 "Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
1357 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) {
1358 /* TODO: mark current BSS less preferred for
1359 * selection */
1360 wpa_printf(MSG_DEBUG, "Trying to find another BSS");
1361 wpa_supplicant_req_scan(wpa_s, 0, 0);
1362 }
1363 }
1364
1365 #ifdef CONFIG_MBO
1366 vendor = get_ie(pos, end - pos, WLAN_EID_VENDOR_SPECIFIC);
1367 if (vendor)
1368 wpas_mbo_ie_trans_req(wpa_s, vendor + 2, vendor[1]);
1369 #endif /* CONFIG_MBO */
1370
1371 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
1372 unsigned int valid_ms;
1373
1374 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
1375 wnm_deallocate_memory(wpa_s);
1376 wpa_s->wnm_neighbor_report_elements = os_calloc(
1377 WNM_MAX_NEIGHBOR_REPORT,
1378 sizeof(struct neighbor_report));
1379 if (wpa_s->wnm_neighbor_report_elements == NULL)
1380 return;
1381
1382 while (end - pos >= 2 &&
1383 wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
1384 {
1385 u8 tag = *pos++;
1386 u8 len = *pos++;
1387
1388 wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
1389 tag);
1390 if (len > end - pos) {
1391 wpa_printf(MSG_DEBUG, "WNM: Truncated request");
1392 return;
1393 }
1394 if (tag == WLAN_EID_NEIGHBOR_REPORT) {
1395 struct neighbor_report *rep;
1396 rep = &wpa_s->wnm_neighbor_report_elements[
1397 wpa_s->wnm_num_neighbor_report];
1398 wnm_parse_neighbor_report(wpa_s, pos, len, rep);
1399 wpa_s->wnm_num_neighbor_report++;
1400 #ifdef CONFIG_MBO
1401 if (wpa_s->wnm_mbo_trans_reason_present &&
1402 wpa_s->wnm_num_neighbor_report == 1) {
1403 rep->is_first = 1;
1404 wpa_printf(MSG_DEBUG,
1405 "WNM: First transition candidate is "
1406 MACSTR, MAC2STR(rep->bssid));
1407 }
1408 #endif /* CONFIG_MBO */
1409 }
1410
1411 pos += len;
1412 }
1413
1414 if (!wpa_s->wnm_num_neighbor_report) {
1415 wpa_printf(MSG_DEBUG,
1416 "WNM: Candidate list included bit is set, but no candidates found");
1417 wnm_send_bss_transition_mgmt_resp(
1418 wpa_s, wpa_s->wnm_dialog_token,
1419 WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES,
1420 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
1421 NULL);
1422 return;
1423 }
1424
1425 wnm_sort_cand_list(wpa_s);
1426 wnm_dump_cand_list(wpa_s);
1427 valid_ms = valid_int * beacon_int * 128 / 125;
1428 wpa_printf(MSG_DEBUG, "WNM: Candidate list valid for %u ms",
1429 valid_ms);
1430 os_get_reltime(&wpa_s->wnm_cand_valid_until);
1431 wpa_s->wnm_cand_valid_until.sec += valid_ms / 1000;
1432 wpa_s->wnm_cand_valid_until.usec += (valid_ms % 1000) * 1000;
1433 wpa_s->wnm_cand_valid_until.sec +=
1434 wpa_s->wnm_cand_valid_until.usec / 1000000;
1435 wpa_s->wnm_cand_valid_until.usec %= 1000000;
1436 os_memcpy(wpa_s->wnm_cand_from_bss, wpa_s->bssid, ETH_ALEN);
1437
1438 /*
1439 * Fetch the latest scan results from the kernel and check for
1440 * candidates based on those results first. This can help in
1441 * finding more up-to-date information should the driver has
1442 * done some internal scanning operations after the last scan
1443 * result update in wpa_supplicant.
1444 */
1445 if (wnm_fetch_scan_results(wpa_s) > 0)
1446 return;
1447
1448 /*
1449 * Try to use previously received scan results, if they are
1450 * recent enough to use for a connection.
1451 */
1452 if (wpa_s->last_scan_res_used > 0) {
1453 struct os_reltime now;
1454
1455 os_get_reltime(&now);
1456 if (!os_reltime_expired(&now, &wpa_s->last_scan, 10)) {
1457 wpa_printf(MSG_DEBUG,
1458 "WNM: Try to use recent scan results");
1459 if (wnm_scan_process(wpa_s, 0) > 0)
1460 return;
1461 wpa_printf(MSG_DEBUG,
1462 "WNM: No match in previous scan results - try a new scan");
1463 }
1464 }
1465
1466 wnm_set_scan_freqs(wpa_s);
1467 if (wpa_s->wnm_num_neighbor_report == 1) {
1468 os_memcpy(wpa_s->next_scan_bssid,
1469 wpa_s->wnm_neighbor_report_elements[0].bssid,
1470 ETH_ALEN);
1471 wpa_printf(MSG_DEBUG,
1472 "WNM: Scan only for a specific BSSID since there is only a single candidate "
1473 MACSTR, MAC2STR(wpa_s->next_scan_bssid));
1474 }
1475 wpa_supplicant_req_scan(wpa_s, 0, 0);
1476 } else if (reply) {
1477 enum bss_trans_mgmt_status_code status;
1478 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT)
1479 status = WNM_BSS_TM_ACCEPT;
1480 else {
1481 wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates");
1482 status = WNM_BSS_TM_REJECT_UNSPECIFIED;
1483 }
1484 wnm_send_bss_transition_mgmt_resp(
1485 wpa_s, wpa_s->wnm_dialog_token, status,
1486 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0, NULL);
1487 }
1488 }
1489
1490
1491 #define BTM_QUERY_MIN_SIZE 4
1492
wnm_send_bss_transition_mgmt_query(struct wpa_supplicant * wpa_s,u8 query_reason,const char * btm_candidates,int cand_list)1493 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
1494 u8 query_reason,
1495 const char *btm_candidates,
1496 int cand_list)
1497 {
1498 struct wpabuf *buf;
1499 int ret;
1500
1501 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
1502 MACSTR " query_reason=%u%s",
1503 MAC2STR(wpa_s->bssid), query_reason,
1504 cand_list ? " candidate list" : "");
1505
1506 buf = wpabuf_alloc(BTM_QUERY_MIN_SIZE);
1507 if (!buf)
1508 return -1;
1509
1510 wpabuf_put_u8(buf, WLAN_ACTION_WNM);
1511 wpabuf_put_u8(buf, WNM_BSS_TRANS_MGMT_QUERY);
1512 wpabuf_put_u8(buf, 1);
1513 wpabuf_put_u8(buf, query_reason);
1514
1515 if (cand_list)
1516 wnm_add_cand_list(wpa_s, &buf);
1517
1518 if (btm_candidates) {
1519 const size_t max_len = 1000;
1520
1521 ret = wpabuf_resize(&buf, max_len);
1522 if (ret < 0) {
1523 wpabuf_free(buf);
1524 return ret;
1525 }
1526
1527 ret = ieee802_11_parse_candidate_list(btm_candidates,
1528 wpabuf_put(buf, 0),
1529 max_len);
1530 if (ret < 0) {
1531 wpabuf_free(buf);
1532 return ret;
1533 }
1534
1535 wpabuf_put(buf, ret);
1536 }
1537
1538 ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
1539 wpa_s->own_addr, wpa_s->bssid,
1540 wpabuf_head_u8(buf), wpabuf_len(buf), 0);
1541
1542 wpabuf_free(buf);
1543 return ret;
1544 }
1545
1546
ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant * wpa_s,const u8 * sa,const u8 * data,int len)1547 static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s,
1548 const u8 *sa, const u8 *data,
1549 int len)
1550 {
1551 const u8 *pos, *end, *next;
1552 u8 ie, ie_len;
1553
1554 pos = data;
1555 end = data + len;
1556
1557 while (end - pos > 1) {
1558 ie = *pos++;
1559 ie_len = *pos++;
1560 wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u",
1561 ie, ie_len);
1562 if (ie_len > end - pos) {
1563 wpa_printf(MSG_DEBUG, "WNM: Not enough room for "
1564 "subelement");
1565 break;
1566 }
1567 next = pos + ie_len;
1568 if (ie_len < 4) {
1569 pos = next;
1570 continue;
1571 }
1572 wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u",
1573 WPA_GET_BE24(pos), pos[3]);
1574
1575 #ifdef CONFIG_HS20
1576 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
1577 WPA_GET_BE24(pos) == OUI_WFA &&
1578 pos[3] == HS20_WNM_SUB_REM_NEEDED) {
1579 /* Subscription Remediation subelement */
1580 const u8 *ie_end;
1581 u8 url_len;
1582 char *url;
1583 u8 osu_method;
1584
1585 wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation "
1586 "subelement");
1587 ie_end = pos + ie_len;
1588 pos += 4;
1589 url_len = *pos++;
1590 if (url_len == 0) {
1591 wpa_printf(MSG_DEBUG, "WNM: No Server URL included");
1592 url = NULL;
1593 osu_method = 1;
1594 } else {
1595 if (url_len + 1 > ie_end - pos) {
1596 wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)",
1597 url_len,
1598 (int) (ie_end - pos));
1599 break;
1600 }
1601 url = os_malloc(url_len + 1);
1602 if (url == NULL)
1603 break;
1604 os_memcpy(url, pos, url_len);
1605 url[url_len] = '\0';
1606 osu_method = pos[url_len];
1607 }
1608 hs20_rx_subscription_remediation(wpa_s, url,
1609 osu_method);
1610 os_free(url);
1611 pos = next;
1612 continue;
1613 }
1614
1615 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 &&
1616 WPA_GET_BE24(pos) == OUI_WFA &&
1617 pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) {
1618 const u8 *ie_end;
1619 u8 url_len;
1620 char *url;
1621 u8 code;
1622 u16 reauth_delay;
1623
1624 ie_end = pos + ie_len;
1625 pos += 4;
1626 code = *pos++;
1627 reauth_delay = WPA_GET_LE16(pos);
1628 pos += 2;
1629 url_len = *pos++;
1630 wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication "
1631 "Imminent - Reason Code %u "
1632 "Re-Auth Delay %u URL Length %u",
1633 code, reauth_delay, url_len);
1634 if (url_len > ie_end - pos)
1635 break;
1636 url = os_malloc(url_len + 1);
1637 if (url == NULL)
1638 break;
1639 os_memcpy(url, pos, url_len);
1640 url[url_len] = '\0';
1641 hs20_rx_deauth_imminent_notice(wpa_s, code,
1642 reauth_delay, url);
1643 os_free(url);
1644 pos = next;
1645 continue;
1646 }
1647 #endif /* CONFIG_HS20 */
1648
1649 pos = next;
1650 }
1651 }
1652
1653
ieee802_11_rx_wnm_notif_req(struct wpa_supplicant * wpa_s,const u8 * sa,const u8 * frm,int len)1654 static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s,
1655 const u8 *sa, const u8 *frm, int len)
1656 {
1657 const u8 *pos, *end;
1658 u8 dialog_token, type;
1659
1660 /* Dialog Token [1] | Type [1] | Subelements */
1661
1662 if (len < 2 || sa == NULL)
1663 return;
1664 end = frm + len;
1665 pos = frm;
1666 dialog_token = *pos++;
1667 type = *pos++;
1668
1669 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request "
1670 "(dialog_token %u type %u sa " MACSTR ")",
1671 dialog_token, type, MAC2STR(sa));
1672 wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements",
1673 pos, end - pos);
1674
1675 if (wpa_s->wpa_state != WPA_COMPLETED ||
1676 os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
1677 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not "
1678 "from our AP - ignore it");
1679 return;
1680 }
1681
1682 switch (type) {
1683 case 1:
1684 ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos);
1685 break;
1686 default:
1687 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown "
1688 "WNM-Notification type %u", type);
1689 break;
1690 }
1691 }
1692
1693
ieee802_11_rx_wnm_action(struct wpa_supplicant * wpa_s,const struct ieee80211_mgmt * mgmt,size_t len)1694 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
1695 const struct ieee80211_mgmt *mgmt, size_t len)
1696 {
1697 const u8 *pos, *end;
1698 u8 act;
1699
1700 if (len < IEEE80211_HDRLEN + 2)
1701 return;
1702
1703 pos = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 1;
1704 act = *pos++;
1705 end = ((const u8 *) mgmt) + len;
1706
1707 wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
1708 act, MAC2STR(mgmt->sa));
1709 if (wpa_s->wpa_state < WPA_ASSOCIATED ||
1710 os_memcmp(mgmt->sa, wpa_s->bssid, ETH_ALEN) != 0) {
1711 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
1712 "frame");
1713 return;
1714 }
1715
1716 switch (act) {
1717 case WNM_BSS_TRANS_MGMT_REQ:
1718 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
1719 !(mgmt->da[0] & 0x01));
1720 break;
1721 case WNM_SLEEP_MODE_RESP:
1722 ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos);
1723 break;
1724 case WNM_NOTIFICATION_REQ:
1725 ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos);
1726 break;
1727 default:
1728 wpa_printf(MSG_ERROR, "WNM: Unknown request");
1729 break;
1730 }
1731 }
1732