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 "wpa_supplicant_i.h"
17 #include "driver_i.h"
18 #include "scan.h"
19 #include "ctrl_iface.h"
20 #include "bss.h"
21 #include "wnm_sta.h"
22 #include "hs20_supplicant.h"
23
24 #define MAX_TFS_IE_LEN 1024
25 #define WNM_MAX_NEIGHBOR_REPORT 10
26
27 #define WNM_SCAN_RESULT_AGE 2 /* 2 seconds */
28
29 /* 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)30 static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
31 u16 *buf_len, enum wnm_oper oper)
32 {
33 wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
34
35 return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
36 }
37
38
39 /* 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)40 static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
41 const u8 *addr, const u8 *buf, u16 buf_len,
42 enum wnm_oper oper)
43 {
44 u16 len = buf_len;
45
46 wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
47
48 return wpa_drv_wnm_oper(wpa_s, oper, addr, (u8 *) buf, &len);
49 }
50
51
52 /* MLME-SLEEPMODE.request */
ieee802_11_send_wnmsleep_req(struct wpa_supplicant * wpa_s,u8 action,u16 intval,struct wpabuf * tfs_req)53 int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
54 u8 action, u16 intval, struct wpabuf *tfs_req)
55 {
56 struct ieee80211_mgmt *mgmt;
57 int res;
58 size_t len;
59 struct wnm_sleep_element *wnmsleep_ie;
60 u8 *wnmtfs_ie;
61 u8 wnmsleep_ie_len;
62 u16 wnmtfs_ie_len; /* possibly multiple IE(s) */
63 enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
64 WNM_SLEEP_TFS_REQ_IE_NONE;
65
66 wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request "
67 "action=%s to " MACSTR,
68 action == 0 ? "enter" : "exit",
69 MAC2STR(wpa_s->bssid));
70
71 /* WNM-Sleep Mode IE */
72 wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
73 wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
74 if (wnmsleep_ie == NULL)
75 return -1;
76 wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
77 wnmsleep_ie->len = wnmsleep_ie_len - 2;
78 wnmsleep_ie->action_type = action;
79 wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
80 wnmsleep_ie->intval = host_to_le16(intval);
81 wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element",
82 (u8 *) wnmsleep_ie, wnmsleep_ie_len);
83
84 /* TFS IE(s) */
85 if (tfs_req) {
86 wnmtfs_ie_len = wpabuf_len(tfs_req);
87 wnmtfs_ie = os_malloc(wnmtfs_ie_len);
88 if (wnmtfs_ie == NULL) {
89 os_free(wnmsleep_ie);
90 return -1;
91 }
92 os_memcpy(wnmtfs_ie, wpabuf_head(tfs_req), wnmtfs_ie_len);
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 has not been used in this association");
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 if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
303 wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
304 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
305 "frame (action=%d, intval=%d)",
306 wnmsleep_ie->action_type, wnmsleep_ie->intval);
307 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
308 wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
309 tfsresp_ie_end);
310 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
311 wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
312 }
313 } else {
314 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
315 "(action=%d, intval=%d)",
316 wnmsleep_ie->action_type, wnmsleep_ie->intval);
317 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
318 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
319 wpa_s->bssid, NULL, NULL);
320 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
321 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
322 wpa_s->bssid, NULL, NULL);
323 }
324 }
325
326
wnm_deallocate_memory(struct wpa_supplicant * wpa_s)327 void wnm_deallocate_memory(struct wpa_supplicant *wpa_s)
328 {
329 int i;
330
331 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
332 os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot);
333 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid);
334 }
335
336 wpa_s->wnm_num_neighbor_report = 0;
337 os_free(wpa_s->wnm_neighbor_report_elements);
338 wpa_s->wnm_neighbor_report_elements = NULL;
339 }
340
341
wnm_parse_neighbor_report_elem(struct neighbor_report * rep,u8 id,u8 elen,const u8 * pos)342 static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep,
343 u8 id, u8 elen, const u8 *pos)
344 {
345 switch (id) {
346 case WNM_NEIGHBOR_TSF:
347 if (elen < 2 + 2) {
348 wpa_printf(MSG_DEBUG, "WNM: Too short TSF");
349 break;
350 }
351 rep->tsf_offset = WPA_GET_LE16(pos);
352 rep->beacon_int = WPA_GET_LE16(pos + 2);
353 rep->tsf_present = 1;
354 break;
355 case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
356 if (elen < 2) {
357 wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
358 "country string");
359 break;
360 }
361 os_memcpy(rep->country, pos, 2);
362 rep->country_present = 1;
363 break;
364 case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
365 if (elen < 1) {
366 wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
367 "candidate");
368 break;
369 }
370 rep->preference = pos[0];
371 rep->preference_present = 1;
372 break;
373 case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
374 rep->bss_term_tsf = WPA_GET_LE64(pos);
375 rep->bss_term_dur = WPA_GET_LE16(pos + 8);
376 rep->bss_term_present = 1;
377 break;
378 case WNM_NEIGHBOR_BEARING:
379 if (elen < 8) {
380 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
381 "bearing");
382 break;
383 }
384 rep->bearing = WPA_GET_LE16(pos);
385 rep->distance = WPA_GET_LE32(pos + 2);
386 rep->rel_height = WPA_GET_LE16(pos + 2 + 4);
387 rep->bearing_present = 1;
388 break;
389 case WNM_NEIGHBOR_MEASUREMENT_PILOT:
390 if (elen < 1) {
391 wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
392 "pilot");
393 break;
394 }
395 os_free(rep->meas_pilot);
396 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
397 if (rep->meas_pilot == NULL)
398 break;
399 rep->meas_pilot->measurement_pilot = pos[0];
400 rep->meas_pilot->subelem_len = elen - 1;
401 os_memcpy(rep->meas_pilot->subelems, pos + 1, elen - 1);
402 break;
403 case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
404 if (elen < 5) {
405 wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
406 "capabilities");
407 break;
408 }
409 os_memcpy(rep->rm_capab, pos, 5);
410 rep->rm_capab_present = 1;
411 break;
412 case WNM_NEIGHBOR_MULTIPLE_BSSID:
413 if (elen < 1) {
414 wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
415 break;
416 }
417 os_free(rep->mul_bssid);
418 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
419 if (rep->mul_bssid == NULL)
420 break;
421 rep->mul_bssid->max_bssid_indicator = pos[0];
422 rep->mul_bssid->subelem_len = elen - 1;
423 os_memcpy(rep->mul_bssid->subelems, pos + 1, elen - 1);
424 break;
425 }
426 }
427
428
wnm_nei_get_chan(struct wpa_supplicant * wpa_s,u8 op_class,u8 chan)429 static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan)
430 {
431 struct wpa_bss *bss = wpa_s->current_bss;
432 const char *country = NULL;
433 int freq;
434
435 if (bss) {
436 const u8 *elem = wpa_bss_get_ie(bss, WLAN_EID_COUNTRY);
437
438 if (elem && elem[1] >= 2)
439 country = (const char *) (elem + 2);
440 }
441
442 freq = ieee80211_chan_to_freq(country, op_class, chan);
443 if (freq <= 0 && op_class == 0) {
444 /*
445 * Some APs do not advertise correct operating class
446 * information. Try to determine the most likely operating
447 * frequency based on the channel number.
448 */
449 if (chan >= 1 && chan <= 13)
450 freq = 2407 + chan * 5;
451 else if (chan == 14)
452 freq = 2484;
453 else if (chan >= 36 && chan <= 169)
454 freq = 5000 + chan * 5;
455 }
456 return freq;
457 }
458
459
wnm_parse_neighbor_report(struct wpa_supplicant * wpa_s,const u8 * pos,u8 len,struct neighbor_report * rep)460 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
461 const u8 *pos, u8 len,
462 struct neighbor_report *rep)
463 {
464 u8 left = len;
465
466 if (left < 13) {
467 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
468 return;
469 }
470
471 os_memcpy(rep->bssid, pos, ETH_ALEN);
472 rep->bssid_info = WPA_GET_LE32(pos + ETH_ALEN);
473 rep->regulatory_class = *(pos + 10);
474 rep->channel_number = *(pos + 11);
475 rep->phy_type = *(pos + 12);
476
477 pos += 13;
478 left -= 13;
479
480 while (left >= 2) {
481 u8 id, elen;
482
483 id = *pos++;
484 elen = *pos++;
485 wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen);
486 left -= 2;
487 if (elen > left) {
488 wpa_printf(MSG_DEBUG,
489 "WNM: Truncated neighbor report subelement");
490 break;
491 }
492 wnm_parse_neighbor_report_elem(rep, id, elen, pos);
493 left -= elen;
494 pos += elen;
495 }
496
497 rep->freq = wnm_nei_get_chan(wpa_s, rep->regulatory_class,
498 rep->channel_number);
499 }
500
501
502 static struct wpa_bss *
compare_scan_neighbor_results(struct wpa_supplicant * wpa_s,os_time_t age_secs)503 compare_scan_neighbor_results(struct wpa_supplicant *wpa_s, os_time_t age_secs)
504 {
505
506 u8 i;
507 struct wpa_bss *bss = wpa_s->current_bss;
508 struct wpa_bss *target;
509
510 if (!bss)
511 return NULL;
512
513 wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
514 MAC2STR(wpa_s->bssid), bss->level);
515
516 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
517 struct neighbor_report *nei;
518
519 nei = &wpa_s->wnm_neighbor_report_elements[i];
520 if (nei->preference_present && nei->preference == 0) {
521 wpa_printf(MSG_DEBUG, "Skip excluded BSS " MACSTR,
522 MAC2STR(nei->bssid));
523 continue;
524 }
525
526 target = wpa_bss_get_bssid(wpa_s, nei->bssid);
527 if (!target) {
528 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
529 " (pref %d) not found in scan results",
530 MAC2STR(nei->bssid),
531 nei->preference_present ? nei->preference :
532 -1);
533 continue;
534 }
535
536 if (age_secs) {
537 struct os_reltime now;
538
539 if (os_get_reltime(&now) == 0 &&
540 os_reltime_expired(&now, &target->last_update,
541 age_secs)) {
542 wpa_printf(MSG_DEBUG,
543 "Candidate BSS is more than %ld seconds old",
544 age_secs);
545 continue;
546 }
547 }
548
549 if (bss->ssid_len != target->ssid_len ||
550 os_memcmp(bss->ssid, target->ssid, bss->ssid_len) != 0) {
551 /*
552 * TODO: Could consider allowing transition to another
553 * ESS if PMF was enabled for the association.
554 */
555 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
556 " (pref %d) in different ESS",
557 MAC2STR(nei->bssid),
558 nei->preference_present ? nei->preference :
559 -1);
560 continue;
561 }
562
563 if (wpa_s->current_ssid &&
564 !wpa_scan_res_match(wpa_s, 0, target, wpa_s->current_ssid,
565 1, 0)) {
566 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
567 " (pref %d) does not match the current network profile",
568 MAC2STR(nei->bssid),
569 nei->preference_present ? nei->preference :
570 -1);
571 continue;
572 }
573
574 if (wpa_is_bss_tmp_disallowed(wpa_s, target->bssid)) {
575 wpa_printf(MSG_DEBUG,
576 "MBO: Candidate BSS " MACSTR
577 " retry delay is not over yet",
578 MAC2STR(nei->bssid));
579 continue;
580 }
581
582 if (target->level < bss->level && target->level < -80) {
583 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
584 " (pref %d) does not have sufficient signal level (%d)",
585 MAC2STR(nei->bssid),
586 nei->preference_present ? nei->preference :
587 -1,
588 target->level);
589 continue;
590 }
591
592 wpa_printf(MSG_DEBUG,
593 "WNM: Found an acceptable preferred transition candidate BSS "
594 MACSTR " (RSSI %d)",
595 MAC2STR(nei->bssid), target->level);
596 return target;
597 }
598
599 return NULL;
600 }
601
602
wpa_bss_ies_eq(struct wpa_bss * a,struct wpa_bss * b,u8 eid)603 static int wpa_bss_ies_eq(struct wpa_bss *a, struct wpa_bss *b, u8 eid)
604 {
605 const u8 *ie_a, *ie_b;
606
607 if (!a || !b)
608 return 0;
609
610 ie_a = wpa_bss_get_ie(a, eid);
611 ie_b = wpa_bss_get_ie(b, eid);
612
613 if (!ie_a || !ie_b || ie_a[1] != ie_b[1])
614 return 0;
615
616 return os_memcmp(ie_a, ie_b, ie_a[1]) == 0;
617 }
618
619
wnm_get_bss_info(struct wpa_supplicant * wpa_s,struct wpa_bss * bss)620 static u32 wnm_get_bss_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
621 {
622 u32 info = 0;
623
624 info |= NEI_REP_BSSID_INFO_AP_UNKNOWN_REACH;
625
626 /*
627 * Leave the security and key scope bits unset to indicate that the
628 * security information is not available.
629 */
630
631 if (bss->caps & WLAN_CAPABILITY_SPECTRUM_MGMT)
632 info |= NEI_REP_BSSID_INFO_SPECTRUM_MGMT;
633 if (bss->caps & WLAN_CAPABILITY_QOS)
634 info |= NEI_REP_BSSID_INFO_QOS;
635 if (bss->caps & WLAN_CAPABILITY_APSD)
636 info |= NEI_REP_BSSID_INFO_APSD;
637 if (bss->caps & WLAN_CAPABILITY_RADIO_MEASUREMENT)
638 info |= NEI_REP_BSSID_INFO_RM;
639 if (bss->caps & WLAN_CAPABILITY_DELAYED_BLOCK_ACK)
640 info |= NEI_REP_BSSID_INFO_DELAYED_BA;
641 if (bss->caps & WLAN_CAPABILITY_IMM_BLOCK_ACK)
642 info |= NEI_REP_BSSID_INFO_IMM_BA;
643 if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_MOBILITY_DOMAIN))
644 info |= NEI_REP_BSSID_INFO_MOBILITY_DOMAIN;
645 if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_HT_CAP))
646 info |= NEI_REP_BSSID_INFO_HT;
647
648 return info;
649 }
650
651
wnm_add_nei_rep(u8 * buf,size_t len,const u8 * bssid,u32 bss_info,u8 op_class,u8 chan,u8 phy_type,u8 pref)652 static int wnm_add_nei_rep(u8 *buf, size_t len, const u8 *bssid, u32 bss_info,
653 u8 op_class, u8 chan, u8 phy_type, u8 pref)
654 {
655 u8 *pos = buf;
656
657 if (len < 18) {
658 wpa_printf(MSG_DEBUG,
659 "WNM: Not enough room for Neighbor Report element");
660 return -1;
661 }
662
663 *pos++ = WLAN_EID_NEIGHBOR_REPORT;
664 /* length: 13 for basic neighbor report + 3 for preference subelement */
665 *pos++ = 16;
666 os_memcpy(pos, bssid, ETH_ALEN);
667 pos += ETH_ALEN;
668 WPA_PUT_LE32(pos, bss_info);
669 pos += 4;
670 *pos++ = op_class;
671 *pos++ = chan;
672 *pos++ = phy_type;
673 *pos++ = WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE;
674 *pos++ = 1;
675 *pos++ = pref;
676 return pos - buf;
677 }
678
679
wnm_nei_rep_add_bss(struct wpa_supplicant * wpa_s,struct wpa_bss * bss,u8 * buf,size_t len,u8 pref)680 static int wnm_nei_rep_add_bss(struct wpa_supplicant *wpa_s,
681 struct wpa_bss *bss, u8 *buf, size_t len,
682 u8 pref)
683 {
684 const u8 *ie;
685 u8 op_class, chan;
686 int sec_chan = 0, vht = 0;
687 enum phy_type phy_type;
688 u32 info;
689 struct ieee80211_ht_operation *ht_oper = NULL;
690 struct ieee80211_vht_operation *vht_oper = NULL;
691
692 ie = wpa_bss_get_ie(bss, WLAN_EID_HT_OPERATION);
693 if (ie && ie[1] >= 2) {
694 ht_oper = (struct ieee80211_ht_operation *) (ie + 2);
695
696 if (ht_oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
697 sec_chan = 1;
698 else if (ht_oper->ht_param &
699 HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
700 sec_chan = -1;
701 }
702
703 ie = wpa_bss_get_ie(bss, WLAN_EID_VHT_OPERATION);
704 if (ie && ie[1] >= 1) {
705 vht_oper = (struct ieee80211_vht_operation *) (ie + 2);
706
707 if (vht_oper->vht_op_info_chwidth == VHT_CHANWIDTH_80MHZ ||
708 vht_oper->vht_op_info_chwidth == VHT_CHANWIDTH_160MHZ ||
709 vht_oper->vht_op_info_chwidth == VHT_CHANWIDTH_80P80MHZ)
710 vht = vht_oper->vht_op_info_chwidth;
711 }
712
713 if (ieee80211_freq_to_channel_ext(bss->freq, sec_chan, vht, &op_class,
714 &chan) == NUM_HOSTAPD_MODES) {
715 wpa_printf(MSG_DEBUG,
716 "WNM: Cannot determine operating class and channel");
717 return -2;
718 }
719
720 phy_type = ieee80211_get_phy_type(bss->freq, (ht_oper != NULL),
721 (vht_oper != NULL));
722 if (phy_type == PHY_TYPE_UNSPECIFIED) {
723 wpa_printf(MSG_DEBUG,
724 "WNM: Cannot determine BSS phy type for Neighbor Report");
725 return -2;
726 }
727
728 info = wnm_get_bss_info(wpa_s, bss);
729
730 return wnm_add_nei_rep(buf, len, bss->bssid, info, op_class, chan,
731 phy_type, pref);
732 }
733
734
wnm_add_cand_list(struct wpa_supplicant * wpa_s,u8 * buf,size_t len)735 static int wnm_add_cand_list(struct wpa_supplicant *wpa_s, u8 *buf, size_t len)
736 {
737 u8 *pos = buf;
738 unsigned int i, pref = 255;
739 struct os_reltime now;
740 struct wpa_ssid *ssid = wpa_s->current_ssid;
741
742 if (!ssid)
743 return 0;
744
745 /*
746 * TODO: Define when scan results are no longer valid for the candidate
747 * list.
748 */
749 os_get_reltime(&now);
750 if (os_reltime_expired(&now, &wpa_s->last_scan, 10))
751 return 0;
752
753 wpa_printf(MSG_DEBUG,
754 "WNM: Add candidate list to BSS Transition Management Response frame");
755 for (i = 0; i < wpa_s->last_scan_res_used && pref; i++) {
756 struct wpa_bss *bss = wpa_s->last_scan_res[i];
757 int res;
758
759 if (wpa_scan_res_match(wpa_s, i, bss, ssid, 1, 0)) {
760 res = wnm_nei_rep_add_bss(wpa_s, bss, pos, len, pref--);
761 if (res == -2)
762 continue; /* could not build entry for BSS */
763 if (res < 0)
764 break; /* no more room for candidates */
765 if (pref == 1)
766 break;
767
768 pos += res;
769 len -= res;
770 }
771 }
772
773 wpa_hexdump(MSG_DEBUG,
774 "WNM: BSS Transition Management Response candidate list",
775 buf, pos - buf);
776
777 return pos - buf;
778 }
779
780
wnm_send_bss_transition_mgmt_resp(struct wpa_supplicant * wpa_s,u8 dialog_token,enum bss_trans_mgmt_status_code status,u8 delay,const u8 * target_bssid)781 static void wnm_send_bss_transition_mgmt_resp(
782 struct wpa_supplicant *wpa_s, u8 dialog_token,
783 enum bss_trans_mgmt_status_code status, u8 delay,
784 const u8 *target_bssid)
785 {
786 u8 buf[2000], *pos;
787 struct ieee80211_mgmt *mgmt;
788 size_t len;
789 int res;
790
791 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response "
792 "to " MACSTR " dialog_token=%u status=%u delay=%d",
793 MAC2STR(wpa_s->bssid), dialog_token, status, delay);
794 if (!wpa_s->current_bss) {
795 wpa_printf(MSG_DEBUG,
796 "WNM: Current BSS not known - drop response");
797 return;
798 }
799
800 mgmt = (struct ieee80211_mgmt *) buf;
801 os_memset(&buf, 0, sizeof(buf));
802 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
803 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
804 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
805 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
806 WLAN_FC_STYPE_ACTION);
807 mgmt->u.action.category = WLAN_ACTION_WNM;
808 mgmt->u.action.u.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP;
809 mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token;
810 mgmt->u.action.u.bss_tm_resp.status_code = status;
811 mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay;
812 pos = mgmt->u.action.u.bss_tm_resp.variable;
813 if (target_bssid) {
814 os_memcpy(pos, target_bssid, ETH_ALEN);
815 pos += ETH_ALEN;
816 } else if (status == WNM_BSS_TM_ACCEPT) {
817 /*
818 * P802.11-REVmc clarifies that the Target BSSID field is always
819 * present when status code is zero, so use a fake value here if
820 * no BSSID is yet known.
821 */
822 os_memset(pos, 0, ETH_ALEN);
823 pos += ETH_ALEN;
824 }
825
826 if (status == WNM_BSS_TM_ACCEPT)
827 pos += wnm_add_cand_list(wpa_s, pos, buf + sizeof(buf) - pos);
828
829 #ifdef CONFIG_MBO
830 if (status != WNM_BSS_TM_ACCEPT) {
831 pos += wpas_mbo_ie_bss_trans_reject(
832 wpa_s, pos, buf + sizeof(buf) - pos,
833 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED);
834 }
835 #endif /* CONFIG_MBO */
836
837 len = pos - (u8 *) &mgmt->u.action.category;
838
839 res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
840 wpa_s->own_addr, wpa_s->bssid,
841 &mgmt->u.action.category, len, 0);
842 if (res < 0) {
843 wpa_printf(MSG_DEBUG,
844 "WNM: Failed to send BSS Transition Management Response");
845 }
846 }
847
848
wnm_bss_tm_connect(struct wpa_supplicant * wpa_s,struct wpa_bss * bss,struct wpa_ssid * ssid,int after_new_scan)849 static void wnm_bss_tm_connect(struct wpa_supplicant *wpa_s,
850 struct wpa_bss *bss, struct wpa_ssid *ssid,
851 int after_new_scan)
852 {
853 wpa_dbg(wpa_s, MSG_DEBUG,
854 "WNM: Transition to BSS " MACSTR
855 " based on BSS Transition Management Request (old BSSID "
856 MACSTR " after_new_scan=%d)",
857 MAC2STR(bss->bssid), MAC2STR(wpa_s->bssid), after_new_scan);
858
859 /* Send the BSS Management Response - Accept */
860 if (wpa_s->wnm_reply) {
861 wpa_s->wnm_reply = 0;
862 wpa_printf(MSG_DEBUG,
863 "WNM: Sending successful BSS Transition Management Response");
864 wnm_send_bss_transition_mgmt_resp(wpa_s,
865 wpa_s->wnm_dialog_token,
866 WNM_BSS_TM_ACCEPT,
867 0, bss->bssid);
868 }
869
870 if (bss == wpa_s->current_bss) {
871 wpa_printf(MSG_DEBUG,
872 "WNM: Already associated with the preferred candidate");
873 wnm_deallocate_memory(wpa_s);
874 return;
875 }
876
877 wpa_s->reassociate = 1;
878 wpa_printf(MSG_DEBUG, "WNM: Issuing connect");
879 wpa_supplicant_connect(wpa_s, bss, ssid);
880 wnm_deallocate_memory(wpa_s);
881 }
882
883
wnm_scan_process(struct wpa_supplicant * wpa_s,int reply_on_fail)884 int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail)
885 {
886 struct wpa_bss *bss;
887 struct wpa_ssid *ssid = wpa_s->current_ssid;
888 enum bss_trans_mgmt_status_code status = WNM_BSS_TM_REJECT_UNSPECIFIED;
889
890 if (!wpa_s->wnm_neighbor_report_elements)
891 return 0;
892
893 wpa_dbg(wpa_s, MSG_DEBUG,
894 "WNM: Process scan results for BSS Transition Management");
895 if (os_reltime_before(&wpa_s->wnm_cand_valid_until,
896 &wpa_s->scan_trigger_time)) {
897 wpa_printf(MSG_DEBUG, "WNM: Previously stored BSS transition candidate list is not valid anymore - drop it");
898 wnm_deallocate_memory(wpa_s);
899 return 0;
900 }
901
902 if (!wpa_s->current_bss ||
903 os_memcmp(wpa_s->wnm_cand_from_bss, wpa_s->current_bss->bssid,
904 ETH_ALEN) != 0) {
905 wpa_printf(MSG_DEBUG, "WNM: Stored BSS transition candidate list not from the current BSS - ignore it");
906 return 0;
907 }
908
909 /* Compare the Neighbor Report and scan results */
910 bss = compare_scan_neighbor_results(wpa_s, 0);
911 if (!bss) {
912 wpa_printf(MSG_DEBUG, "WNM: No BSS transition candidate match found");
913 status = WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES;
914 goto send_bss_resp_fail;
915 }
916
917 /* Associate to the network */
918 wnm_bss_tm_connect(wpa_s, bss, ssid, 1);
919 return 1;
920
921 send_bss_resp_fail:
922 if (!reply_on_fail)
923 return 0;
924
925 /* Send reject response for all the failures */
926
927 if (wpa_s->wnm_reply) {
928 wpa_s->wnm_reply = 0;
929 wnm_send_bss_transition_mgmt_resp(wpa_s,
930 wpa_s->wnm_dialog_token,
931 status, 0, NULL);
932 }
933 wnm_deallocate_memory(wpa_s);
934
935 return 0;
936 }
937
938
cand_pref_compar(const void * a,const void * b)939 static int cand_pref_compar(const void *a, const void *b)
940 {
941 const struct neighbor_report *aa = a;
942 const struct neighbor_report *bb = b;
943
944 if (!aa->preference_present && !bb->preference_present)
945 return 0;
946 if (!aa->preference_present)
947 return 1;
948 if (!bb->preference_present)
949 return -1;
950 if (bb->preference > aa->preference)
951 return 1;
952 if (bb->preference < aa->preference)
953 return -1;
954 return 0;
955 }
956
957
wnm_sort_cand_list(struct wpa_supplicant * wpa_s)958 static void wnm_sort_cand_list(struct wpa_supplicant *wpa_s)
959 {
960 if (!wpa_s->wnm_neighbor_report_elements)
961 return;
962 qsort(wpa_s->wnm_neighbor_report_elements,
963 wpa_s->wnm_num_neighbor_report, sizeof(struct neighbor_report),
964 cand_pref_compar);
965 }
966
967
wnm_dump_cand_list(struct wpa_supplicant * wpa_s)968 static void wnm_dump_cand_list(struct wpa_supplicant *wpa_s)
969 {
970 unsigned int i;
971
972 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Candidate List");
973 if (!wpa_s->wnm_neighbor_report_elements)
974 return;
975 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
976 struct neighbor_report *nei;
977
978 nei = &wpa_s->wnm_neighbor_report_elements[i];
979 wpa_printf(MSG_DEBUG, "%u: " MACSTR
980 " info=0x%x op_class=%u chan=%u phy=%u pref=%d freq=%d",
981 i, MAC2STR(nei->bssid), nei->bssid_info,
982 nei->regulatory_class,
983 nei->channel_number, nei->phy_type,
984 nei->preference_present ? nei->preference : -1,
985 nei->freq);
986 }
987 }
988
989
chan_supported(struct wpa_supplicant * wpa_s,int freq)990 static int chan_supported(struct wpa_supplicant *wpa_s, int freq)
991 {
992 unsigned int i;
993
994 for (i = 0; i < wpa_s->hw.num_modes; i++) {
995 struct hostapd_hw_modes *mode = &wpa_s->hw.modes[i];
996 int j;
997
998 for (j = 0; j < mode->num_channels; j++) {
999 struct hostapd_channel_data *chan;
1000
1001 chan = &mode->channels[j];
1002 if (chan->freq == freq &&
1003 !(chan->flag & HOSTAPD_CHAN_DISABLED))
1004 return 1;
1005 }
1006 }
1007
1008 return 0;
1009 }
1010
1011
wnm_set_scan_freqs(struct wpa_supplicant * wpa_s)1012 static void wnm_set_scan_freqs(struct wpa_supplicant *wpa_s)
1013 {
1014 int *freqs;
1015 int num_freqs = 0;
1016 unsigned int i;
1017
1018 if (!wpa_s->wnm_neighbor_report_elements)
1019 return;
1020
1021 if (wpa_s->hw.modes == NULL)
1022 return;
1023
1024 os_free(wpa_s->next_scan_freqs);
1025 wpa_s->next_scan_freqs = NULL;
1026
1027 freqs = os_calloc(wpa_s->wnm_num_neighbor_report + 1, sizeof(int));
1028 if (freqs == NULL)
1029 return;
1030
1031 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
1032 struct neighbor_report *nei;
1033
1034 nei = &wpa_s->wnm_neighbor_report_elements[i];
1035 if (nei->freq <= 0) {
1036 wpa_printf(MSG_DEBUG,
1037 "WNM: Unknown neighbor operating frequency for "
1038 MACSTR " - scan all channels",
1039 MAC2STR(nei->bssid));
1040 os_free(freqs);
1041 return;
1042 }
1043 if (chan_supported(wpa_s, nei->freq))
1044 add_freq(freqs, &num_freqs, nei->freq);
1045 }
1046
1047 if (num_freqs == 0) {
1048 os_free(freqs);
1049 return;
1050 }
1051
1052 wpa_printf(MSG_DEBUG,
1053 "WNM: Scan %d frequencies based on transition candidate list",
1054 num_freqs);
1055 wpa_s->next_scan_freqs = freqs;
1056 }
1057
1058
wnm_fetch_scan_results(struct wpa_supplicant * wpa_s)1059 static int wnm_fetch_scan_results(struct wpa_supplicant *wpa_s)
1060 {
1061 struct wpa_scan_results *scan_res;
1062 struct wpa_bss *bss;
1063 struct wpa_ssid *ssid = wpa_s->current_ssid;
1064 u8 i, found = 0;
1065 size_t j;
1066
1067 wpa_dbg(wpa_s, MSG_DEBUG,
1068 "WNM: Fetch current scan results from the driver for checking transition candidates");
1069 scan_res = wpa_drv_get_scan_results2(wpa_s);
1070 if (!scan_res) {
1071 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Failed to get scan results");
1072 return 0;
1073 }
1074
1075 if (scan_res->fetch_time.sec == 0)
1076 os_get_reltime(&scan_res->fetch_time);
1077
1078 filter_scan_res(wpa_s, scan_res);
1079
1080 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
1081 struct neighbor_report *nei;
1082
1083 nei = &wpa_s->wnm_neighbor_report_elements[i];
1084 if (nei->preference_present && nei->preference == 0)
1085 continue;
1086
1087 for (j = 0; j < scan_res->num; j++) {
1088 struct wpa_scan_res *res;
1089 const u8 *ssid_ie;
1090
1091 res = scan_res->res[j];
1092 if (os_memcmp(nei->bssid, res->bssid, ETH_ALEN) != 0 ||
1093 res->age > WNM_SCAN_RESULT_AGE * 1000)
1094 continue;
1095 bss = wpa_s->current_bss;
1096 ssid_ie = wpa_scan_get_ie(res, WLAN_EID_SSID);
1097 if (bss && ssid_ie &&
1098 (bss->ssid_len != ssid_ie[1] ||
1099 os_memcmp(bss->ssid, ssid_ie + 2,
1100 bss->ssid_len) != 0))
1101 continue;
1102
1103 /* Potential candidate found */
1104 found = 1;
1105 scan_snr(res);
1106 scan_est_throughput(wpa_s, res);
1107 wpa_bss_update_scan_res(wpa_s, res,
1108 &scan_res->fetch_time);
1109 }
1110 }
1111
1112 wpa_scan_results_free(scan_res);
1113 if (!found) {
1114 wpa_dbg(wpa_s, MSG_DEBUG,
1115 "WNM: No transition candidate matches existing scan results");
1116 return 0;
1117 }
1118
1119 bss = compare_scan_neighbor_results(wpa_s, WNM_SCAN_RESULT_AGE);
1120 if (!bss) {
1121 wpa_dbg(wpa_s, MSG_DEBUG,
1122 "WNM: Comparison of scan results against transition candidates did not find matches");
1123 return 0;
1124 }
1125
1126 /* Associate to the network */
1127 wnm_bss_tm_connect(wpa_s, bss, ssid, 0);
1128 return 1;
1129 }
1130
1131
ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant * wpa_s,const u8 * pos,const u8 * end,int reply)1132 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
1133 const u8 *pos, const u8 *end,
1134 int reply)
1135 {
1136 unsigned int beacon_int;
1137 u8 valid_int;
1138 #ifdef CONFIG_MBO
1139 const u8 *vendor;
1140 #endif /* CONFIG_MBO */
1141
1142 if (end - pos < 5)
1143 return;
1144
1145 if (wpa_s->current_bss)
1146 beacon_int = wpa_s->current_bss->beacon_int;
1147 else
1148 beacon_int = 100; /* best guess */
1149
1150 wpa_s->wnm_dialog_token = pos[0];
1151 wpa_s->wnm_mode = pos[1];
1152 wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
1153 valid_int = pos[4];
1154 wpa_s->wnm_reply = reply;
1155
1156 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
1157 "dialog_token=%u request_mode=0x%x "
1158 "disassoc_timer=%u validity_interval=%u",
1159 wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
1160 wpa_s->wnm_dissoc_timer, valid_int);
1161
1162 #if defined(CONFIG_MBO) && defined(CONFIG_TESTING_OPTIONS)
1163 if (wpa_s->reject_btm_req_reason) {
1164 wpa_printf(MSG_INFO,
1165 "WNM: Testing - reject BSS Transition Management Request: reject_btm_req_reason=%d",
1166 wpa_s->reject_btm_req_reason);
1167 wnm_send_bss_transition_mgmt_resp(wpa_s,
1168 wpa_s->wnm_dialog_token,
1169 wpa_s->reject_btm_req_reason,
1170 0, NULL);
1171 return;
1172 }
1173 #endif /* CONFIG_MBO && CONFIG_TESTING_OPTIONS */
1174
1175 pos += 5;
1176
1177 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
1178 if (end - pos < 12) {
1179 wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
1180 return;
1181 }
1182 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
1183 pos += 12; /* BSS Termination Duration */
1184 }
1185
1186 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
1187 char url[256];
1188
1189 if (end - pos < 1 || 1 + pos[0] > end - pos) {
1190 wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
1191 "Management Request (URL)");
1192 return;
1193 }
1194 os_memcpy(url, pos + 1, pos[0]);
1195 url[pos[0]] = '\0';
1196 pos += 1 + pos[0];
1197
1198 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
1199 wpa_sm_pmf_enabled(wpa_s->wpa),
1200 wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
1201 }
1202
1203 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
1204 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
1205 "Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
1206 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) {
1207 /* TODO: mark current BSS less preferred for
1208 * selection */
1209 wpa_printf(MSG_DEBUG, "Trying to find another BSS");
1210 wpa_supplicant_req_scan(wpa_s, 0, 0);
1211 }
1212 }
1213
1214 #ifdef CONFIG_MBO
1215 vendor = get_ie(pos, end - pos, WLAN_EID_VENDOR_SPECIFIC);
1216 if (vendor)
1217 wpas_mbo_ie_trans_req(wpa_s, vendor + 2, vendor[1]);
1218 #endif /* CONFIG_MBO */
1219
1220 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
1221 unsigned int valid_ms;
1222
1223 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
1224 wnm_deallocate_memory(wpa_s);
1225 wpa_s->wnm_neighbor_report_elements = os_calloc(
1226 WNM_MAX_NEIGHBOR_REPORT,
1227 sizeof(struct neighbor_report));
1228 if (wpa_s->wnm_neighbor_report_elements == NULL)
1229 return;
1230
1231 while (end - pos >= 2 &&
1232 wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
1233 {
1234 u8 tag = *pos++;
1235 u8 len = *pos++;
1236
1237 wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
1238 tag);
1239 if (len > end - pos) {
1240 wpa_printf(MSG_DEBUG, "WNM: Truncated request");
1241 return;
1242 }
1243 if (tag == WLAN_EID_NEIGHBOR_REPORT) {
1244 struct neighbor_report *rep;
1245 rep = &wpa_s->wnm_neighbor_report_elements[
1246 wpa_s->wnm_num_neighbor_report];
1247 wnm_parse_neighbor_report(wpa_s, pos, len, rep);
1248 wpa_s->wnm_num_neighbor_report++;
1249 }
1250
1251 pos += len;
1252 }
1253
1254 if (!wpa_s->wnm_num_neighbor_report) {
1255 wpa_printf(MSG_DEBUG,
1256 "WNM: Candidate list included bit is set, but no candidates found");
1257 wnm_send_bss_transition_mgmt_resp(
1258 wpa_s, wpa_s->wnm_dialog_token,
1259 WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES,
1260 0, NULL);
1261 return;
1262 }
1263
1264 wnm_sort_cand_list(wpa_s);
1265 wnm_dump_cand_list(wpa_s);
1266 valid_ms = valid_int * beacon_int * 128 / 125;
1267 wpa_printf(MSG_DEBUG, "WNM: Candidate list valid for %u ms",
1268 valid_ms);
1269 os_get_reltime(&wpa_s->wnm_cand_valid_until);
1270 wpa_s->wnm_cand_valid_until.sec += valid_ms / 1000;
1271 wpa_s->wnm_cand_valid_until.usec += (valid_ms % 1000) * 1000;
1272 wpa_s->wnm_cand_valid_until.sec +=
1273 wpa_s->wnm_cand_valid_until.usec / 1000000;
1274 wpa_s->wnm_cand_valid_until.usec %= 1000000;
1275 os_memcpy(wpa_s->wnm_cand_from_bss, wpa_s->bssid, ETH_ALEN);
1276
1277 /*
1278 * Fetch the latest scan results from the kernel and check for
1279 * candidates based on those results first. This can help in
1280 * finding more up-to-date information should the driver has
1281 * done some internal scanning operations after the last scan
1282 * result update in wpa_supplicant.
1283 */
1284 if (wnm_fetch_scan_results(wpa_s) > 0)
1285 return;
1286
1287 /*
1288 * Try to use previously received scan results, if they are
1289 * recent enough to use for a connection.
1290 */
1291 if (wpa_s->last_scan_res_used > 0) {
1292 struct os_reltime now;
1293
1294 os_get_reltime(&now);
1295 if (!os_reltime_expired(&now, &wpa_s->last_scan, 10)) {
1296 wpa_printf(MSG_DEBUG,
1297 "WNM: Try to use recent scan results");
1298 if (wnm_scan_process(wpa_s, 0) > 0)
1299 return;
1300 wpa_printf(MSG_DEBUG,
1301 "WNM: No match in previous scan results - try a new scan");
1302 }
1303 }
1304
1305 wnm_set_scan_freqs(wpa_s);
1306 if (wpa_s->wnm_num_neighbor_report == 1) {
1307 os_memcpy(wpa_s->next_scan_bssid,
1308 wpa_s->wnm_neighbor_report_elements[0].bssid,
1309 ETH_ALEN);
1310 wpa_printf(MSG_DEBUG,
1311 "WNM: Scan only for a specific BSSID since there is only a single candidate "
1312 MACSTR, MAC2STR(wpa_s->next_scan_bssid));
1313 }
1314 wpa_supplicant_req_scan(wpa_s, 0, 0);
1315 } else if (reply) {
1316 enum bss_trans_mgmt_status_code status;
1317 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT)
1318 status = WNM_BSS_TM_ACCEPT;
1319 else {
1320 wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates");
1321 status = WNM_BSS_TM_REJECT_UNSPECIFIED;
1322 }
1323 wnm_send_bss_transition_mgmt_resp(wpa_s,
1324 wpa_s->wnm_dialog_token,
1325 status, 0, NULL);
1326 }
1327 }
1328
1329
wnm_send_bss_transition_mgmt_query(struct wpa_supplicant * wpa_s,u8 query_reason,int cand_list)1330 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
1331 u8 query_reason, int cand_list)
1332 {
1333 u8 buf[2000], *pos;
1334 struct ieee80211_mgmt *mgmt;
1335 size_t len;
1336 int ret;
1337
1338 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
1339 MACSTR " query_reason=%u%s",
1340 MAC2STR(wpa_s->bssid), query_reason,
1341 cand_list ? " candidate list" : "");
1342
1343 mgmt = (struct ieee80211_mgmt *) buf;
1344 os_memset(&buf, 0, sizeof(buf));
1345 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
1346 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
1347 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
1348 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
1349 WLAN_FC_STYPE_ACTION);
1350 mgmt->u.action.category = WLAN_ACTION_WNM;
1351 mgmt->u.action.u.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY;
1352 mgmt->u.action.u.bss_tm_query.dialog_token = 1;
1353 mgmt->u.action.u.bss_tm_query.query_reason = query_reason;
1354 pos = mgmt->u.action.u.bss_tm_query.variable;
1355
1356 if (cand_list)
1357 pos += wnm_add_cand_list(wpa_s, pos, buf + sizeof(buf) - pos);
1358
1359 len = pos - (u8 *) &mgmt->u.action.category;
1360
1361 ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
1362 wpa_s->own_addr, wpa_s->bssid,
1363 &mgmt->u.action.category, len, 0);
1364
1365 return ret;
1366 }
1367
1368
ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant * wpa_s,const u8 * sa,const u8 * data,int len)1369 static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s,
1370 const u8 *sa, const u8 *data,
1371 int len)
1372 {
1373 const u8 *pos, *end, *next;
1374 u8 ie, ie_len;
1375
1376 pos = data;
1377 end = data + len;
1378
1379 while (end - pos > 1) {
1380 ie = *pos++;
1381 ie_len = *pos++;
1382 wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u",
1383 ie, ie_len);
1384 if (ie_len > end - pos) {
1385 wpa_printf(MSG_DEBUG, "WNM: Not enough room for "
1386 "subelement");
1387 break;
1388 }
1389 next = pos + ie_len;
1390 if (ie_len < 4) {
1391 pos = next;
1392 continue;
1393 }
1394 wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u",
1395 WPA_GET_BE24(pos), pos[3]);
1396
1397 #ifdef CONFIG_HS20
1398 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
1399 WPA_GET_BE24(pos) == OUI_WFA &&
1400 pos[3] == HS20_WNM_SUB_REM_NEEDED) {
1401 /* Subscription Remediation subelement */
1402 const u8 *ie_end;
1403 u8 url_len;
1404 char *url;
1405 u8 osu_method;
1406
1407 wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation "
1408 "subelement");
1409 ie_end = pos + ie_len;
1410 pos += 4;
1411 url_len = *pos++;
1412 if (url_len == 0) {
1413 wpa_printf(MSG_DEBUG, "WNM: No Server URL included");
1414 url = NULL;
1415 osu_method = 1;
1416 } else {
1417 if (url_len + 1 > ie_end - pos) {
1418 wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)",
1419 url_len,
1420 (int) (ie_end - pos));
1421 break;
1422 }
1423 url = os_malloc(url_len + 1);
1424 if (url == NULL)
1425 break;
1426 os_memcpy(url, pos, url_len);
1427 url[url_len] = '\0';
1428 osu_method = pos[url_len];
1429 }
1430 hs20_rx_subscription_remediation(wpa_s, url,
1431 osu_method);
1432 os_free(url);
1433 pos = next;
1434 continue;
1435 }
1436
1437 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 &&
1438 WPA_GET_BE24(pos) == OUI_WFA &&
1439 pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) {
1440 const u8 *ie_end;
1441 u8 url_len;
1442 char *url;
1443 u8 code;
1444 u16 reauth_delay;
1445
1446 ie_end = pos + ie_len;
1447 pos += 4;
1448 code = *pos++;
1449 reauth_delay = WPA_GET_LE16(pos);
1450 pos += 2;
1451 url_len = *pos++;
1452 wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication "
1453 "Imminent - Reason Code %u "
1454 "Re-Auth Delay %u URL Length %u",
1455 code, reauth_delay, url_len);
1456 if (url_len > ie_end - pos)
1457 break;
1458 url = os_malloc(url_len + 1);
1459 if (url == NULL)
1460 break;
1461 os_memcpy(url, pos, url_len);
1462 url[url_len] = '\0';
1463 hs20_rx_deauth_imminent_notice(wpa_s, code,
1464 reauth_delay, url);
1465 os_free(url);
1466 pos = next;
1467 continue;
1468 }
1469 #endif /* CONFIG_HS20 */
1470
1471 pos = next;
1472 }
1473 }
1474
1475
ieee802_11_rx_wnm_notif_req(struct wpa_supplicant * wpa_s,const u8 * sa,const u8 * frm,int len)1476 static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s,
1477 const u8 *sa, const u8 *frm, int len)
1478 {
1479 const u8 *pos, *end;
1480 u8 dialog_token, type;
1481
1482 /* Dialog Token [1] | Type [1] | Subelements */
1483
1484 if (len < 2 || sa == NULL)
1485 return;
1486 end = frm + len;
1487 pos = frm;
1488 dialog_token = *pos++;
1489 type = *pos++;
1490
1491 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request "
1492 "(dialog_token %u type %u sa " MACSTR ")",
1493 dialog_token, type, MAC2STR(sa));
1494 wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements",
1495 pos, end - pos);
1496
1497 if (wpa_s->wpa_state != WPA_COMPLETED ||
1498 os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
1499 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not "
1500 "from our AP - ignore it");
1501 return;
1502 }
1503
1504 switch (type) {
1505 case 1:
1506 ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos);
1507 break;
1508 default:
1509 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown "
1510 "WNM-Notification type %u", type);
1511 break;
1512 }
1513 }
1514
1515
ieee802_11_rx_wnm_action(struct wpa_supplicant * wpa_s,const struct ieee80211_mgmt * mgmt,size_t len)1516 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
1517 const struct ieee80211_mgmt *mgmt, size_t len)
1518 {
1519 const u8 *pos, *end;
1520 u8 act;
1521
1522 if (len < IEEE80211_HDRLEN + 2)
1523 return;
1524
1525 pos = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 1;
1526 act = *pos++;
1527 end = ((const u8 *) mgmt) + len;
1528
1529 wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
1530 act, MAC2STR(mgmt->sa));
1531 if (wpa_s->wpa_state < WPA_ASSOCIATED ||
1532 os_memcmp(mgmt->sa, wpa_s->bssid, ETH_ALEN) != 0) {
1533 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
1534 "frame");
1535 return;
1536 }
1537
1538 switch (act) {
1539 case WNM_BSS_TRANS_MGMT_REQ:
1540 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
1541 !(mgmt->da[0] & 0x01));
1542 break;
1543 case WNM_SLEEP_MODE_RESP:
1544 ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos);
1545 break;
1546 case WNM_NOTIFICATION_REQ:
1547 ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos);
1548 break;
1549 default:
1550 wpa_printf(MSG_ERROR, "WNM: Unknown request");
1551 break;
1552 }
1553 }
1554