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/wpa_ctrl.h"
14 #include "rsn_supp/wpa.h"
15 #include "wpa_supplicant_i.h"
16 #include "driver_i.h"
17 #include "scan.h"
18 #include "ctrl_iface.h"
19 #include "bss.h"
20 #include "wnm_sta.h"
21 #include "hs20_supplicant.h"
22
23 #define MAX_TFS_IE_LEN 1024
24 #define WNM_MAX_NEIGHBOR_REPORT 10
25
26
27 /* 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)28 static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
29 u16 *buf_len, enum wnm_oper oper)
30 {
31 wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
32
33 return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
34 }
35
36
37 /* set the TFS IE to driver */
ieee80211_11_set_tfs_ie(struct wpa_supplicant * wpa_s,const u8 * addr,u8 * buf,u16 * buf_len,enum wnm_oper oper)38 static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
39 const u8 *addr, u8 *buf, u16 *buf_len,
40 enum wnm_oper oper)
41 {
42 wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
43
44 return wpa_drv_wnm_oper(wpa_s, oper, addr, buf, buf_len);
45 }
46
47
48 /* MLME-SLEEPMODE.request */
ieee802_11_send_wnmsleep_req(struct wpa_supplicant * wpa_s,u8 action,u16 intval,struct wpabuf * tfs_req)49 int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
50 u8 action, u16 intval, struct wpabuf *tfs_req)
51 {
52 struct ieee80211_mgmt *mgmt;
53 int res;
54 size_t len;
55 struct wnm_sleep_element *wnmsleep_ie;
56 u8 *wnmtfs_ie;
57 u8 wnmsleep_ie_len;
58 u16 wnmtfs_ie_len; /* possibly multiple IE(s) */
59 enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
60 WNM_SLEEP_TFS_REQ_IE_NONE;
61
62 wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request "
63 "action=%s to " MACSTR,
64 action == 0 ? "enter" : "exit",
65 MAC2STR(wpa_s->bssid));
66
67 /* WNM-Sleep Mode IE */
68 wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
69 wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
70 if (wnmsleep_ie == NULL)
71 return -1;
72 wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
73 wnmsleep_ie->len = wnmsleep_ie_len - 2;
74 wnmsleep_ie->action_type = action;
75 wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
76 wnmsleep_ie->intval = host_to_le16(intval);
77 wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element",
78 (u8 *) wnmsleep_ie, wnmsleep_ie_len);
79
80 /* TFS IE(s) */
81 if (tfs_req) {
82 wnmtfs_ie_len = wpabuf_len(tfs_req);
83 wnmtfs_ie = os_malloc(wnmtfs_ie_len);
84 if (wnmtfs_ie == NULL) {
85 os_free(wnmsleep_ie);
86 return -1;
87 }
88 os_memcpy(wnmtfs_ie, wpabuf_head(tfs_req), wnmtfs_ie_len);
89 } else {
90 wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
91 if (wnmtfs_ie == NULL) {
92 os_free(wnmsleep_ie);
93 return -1;
94 }
95 if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
96 tfs_oper)) {
97 wnmtfs_ie_len = 0;
98 os_free(wnmtfs_ie);
99 wnmtfs_ie = NULL;
100 }
101 }
102 wpa_hexdump(MSG_DEBUG, "WNM: TFS Request element",
103 (u8 *) wnmtfs_ie, wnmtfs_ie_len);
104
105 mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len);
106 if (mgmt == NULL) {
107 wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
108 "WNM-Sleep Request action frame");
109 os_free(wnmsleep_ie);
110 os_free(wnmtfs_ie);
111 return -1;
112 }
113
114 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
115 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
116 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
117 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
118 WLAN_FC_STYPE_ACTION);
119 mgmt->u.action.category = WLAN_ACTION_WNM;
120 mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ;
121 mgmt->u.action.u.wnm_sleep_req.dialogtoken = 1;
122 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
123 wnmsleep_ie_len);
124 /* copy TFS IE here */
125 if (wnmtfs_ie_len > 0) {
126 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
127 wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
128 }
129
130 len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
131 wnmtfs_ie_len;
132
133 res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
134 wpa_s->own_addr, wpa_s->bssid,
135 &mgmt->u.action.category, len, 0);
136 if (res < 0)
137 wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
138 "(action=%d, intval=%d)", action, intval);
139
140 os_free(wnmsleep_ie);
141 os_free(wnmtfs_ie);
142 os_free(mgmt);
143
144 return res;
145 }
146
147
wnm_sleep_mode_enter_success(struct wpa_supplicant * wpa_s,u8 * tfsresp_ie_start,u8 * tfsresp_ie_end)148 static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s,
149 u8 *tfsresp_ie_start,
150 u8 *tfsresp_ie_end)
151 {
152 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
153 wpa_s->bssid, NULL, NULL);
154 /* remove GTK/IGTK ?? */
155
156 /* set the TFS Resp IE(s) */
157 if (tfsresp_ie_start && tfsresp_ie_end &&
158 tfsresp_ie_end - tfsresp_ie_start >= 0) {
159 u16 tfsresp_ie_len;
160 tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) -
161 tfsresp_ie_start;
162 wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
163 /* pass the TFS Resp IE(s) to driver for processing */
164 if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid,
165 tfsresp_ie_start,
166 &tfsresp_ie_len,
167 WNM_SLEEP_TFS_RESP_IE_SET))
168 wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE");
169 }
170 }
171
172
wnm_sleep_mode_exit_success(struct wpa_supplicant * wpa_s,const u8 * frm,u16 key_len_total)173 static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
174 const u8 *frm, u16 key_len_total)
175 {
176 u8 *ptr, *end;
177 u8 gtk_len;
178
179 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM, wpa_s->bssid,
180 NULL, NULL);
181
182 /* Install GTK/IGTK */
183
184 /* point to key data field */
185 ptr = (u8 *) frm + 1 + 2;
186 end = ptr + key_len_total;
187 wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
188
189 while (ptr + 1 < end) {
190 if (ptr + 2 + ptr[1] > end) {
191 wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
192 "length");
193 if (end > ptr) {
194 wpa_hexdump(MSG_DEBUG, "WNM: Remaining data",
195 ptr, end - ptr);
196 }
197 break;
198 }
199 if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
200 if (ptr[1] < 11 + 5) {
201 wpa_printf(MSG_DEBUG, "WNM: Too short GTK "
202 "subelem");
203 break;
204 }
205 gtk_len = *(ptr + 4);
206 if (ptr[1] < 11 + gtk_len ||
207 gtk_len < 5 || gtk_len > 32) {
208 wpa_printf(MSG_DEBUG, "WNM: Invalid GTK "
209 "subelem");
210 break;
211 }
212 wpa_wnmsleep_install_key(
213 wpa_s->wpa,
214 WNM_SLEEP_SUBELEM_GTK,
215 ptr);
216 ptr += 13 + gtk_len;
217 #ifdef CONFIG_IEEE80211W
218 } else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) {
219 if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) {
220 wpa_printf(MSG_DEBUG, "WNM: Too short IGTK "
221 "subelem");
222 break;
223 }
224 wpa_wnmsleep_install_key(wpa_s->wpa,
225 WNM_SLEEP_SUBELEM_IGTK, ptr);
226 ptr += 10 + WPA_IGTK_LEN;
227 #endif /* CONFIG_IEEE80211W */
228 } else
229 break; /* skip the loop */
230 }
231 }
232
233
ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant * wpa_s,const u8 * frm,int len)234 static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
235 const u8 *frm, int len)
236 {
237 /*
238 * Action [1] | Dialog Token [1] | Key Data Len [2] | Key Data |
239 * WNM-Sleep Mode IE | TFS Response IE
240 */
241 u8 *pos = (u8 *) frm; /* point to payload after the action field */
242 u16 key_len_total;
243 struct wnm_sleep_element *wnmsleep_ie = NULL;
244 /* multiple TFS Resp IE (assuming consecutive) */
245 u8 *tfsresp_ie_start = NULL;
246 u8 *tfsresp_ie_end = NULL;
247
248 if (len < 3)
249 return;
250 key_len_total = WPA_GET_LE16(frm + 1);
251
252 wpa_printf(MSG_DEBUG, "WNM-Sleep Mode Response token=%u key_len_total=%d",
253 frm[0], key_len_total);
254 pos += 3 + key_len_total;
255 if (pos > frm + len) {
256 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
257 return;
258 }
259 while (pos - frm < len) {
260 u8 ie_len = *(pos + 1);
261 if (pos + 2 + ie_len > frm + len) {
262 wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
263 break;
264 }
265 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
266 if (*pos == WLAN_EID_WNMSLEEP)
267 wnmsleep_ie = (struct wnm_sleep_element *) pos;
268 else if (*pos == WLAN_EID_TFS_RESP) {
269 if (!tfsresp_ie_start)
270 tfsresp_ie_start = pos;
271 tfsresp_ie_end = pos;
272 } else
273 wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
274 pos += ie_len + 2;
275 }
276
277 if (!wnmsleep_ie) {
278 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
279 return;
280 }
281
282 if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
283 wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
284 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
285 "frame (action=%d, intval=%d)",
286 wnmsleep_ie->action_type, wnmsleep_ie->intval);
287 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
288 wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
289 tfsresp_ie_end);
290 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
291 wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
292 }
293 } else {
294 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
295 "(action=%d, intval=%d)",
296 wnmsleep_ie->action_type, wnmsleep_ie->intval);
297 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
298 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
299 wpa_s->bssid, NULL, NULL);
300 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
301 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
302 wpa_s->bssid, NULL, NULL);
303 }
304 }
305
306
wnm_deallocate_memory(struct wpa_supplicant * wpa_s)307 void wnm_deallocate_memory(struct wpa_supplicant *wpa_s)
308 {
309 int i;
310
311 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
312 os_free(wpa_s->wnm_neighbor_report_elements[i].tsf_info);
313 os_free(wpa_s->wnm_neighbor_report_elements[i].con_coun_str);
314 os_free(wpa_s->wnm_neighbor_report_elements[i].bss_tran_can);
315 os_free(wpa_s->wnm_neighbor_report_elements[i].bss_term_dur);
316 os_free(wpa_s->wnm_neighbor_report_elements[i].bearing);
317 os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot);
318 os_free(wpa_s->wnm_neighbor_report_elements[i].rrm_cap);
319 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid);
320 }
321
322 wpa_s->wnm_num_neighbor_report = 0;
323 os_free(wpa_s->wnm_neighbor_report_elements);
324 wpa_s->wnm_neighbor_report_elements = NULL;
325 }
326
327
wnm_parse_neighbor_report_elem(struct neighbor_report * rep,u8 id,u8 elen,const u8 * pos)328 static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep,
329 u8 id, u8 elen, const u8 *pos)
330 {
331 switch (id) {
332 case WNM_NEIGHBOR_TSF:
333 if (elen < 2 + 2) {
334 wpa_printf(MSG_DEBUG, "WNM: Too short TSF");
335 break;
336 }
337 os_free(rep->tsf_info);
338 rep->tsf_info = os_zalloc(sizeof(struct tsf_info));
339 if (rep->tsf_info == NULL)
340 break;
341 os_memcpy(rep->tsf_info->tsf_offset, pos, 2);
342 os_memcpy(rep->tsf_info->beacon_interval, pos + 2, 2);
343 break;
344 case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
345 if (elen < 2) {
346 wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
347 "country string");
348 break;
349 }
350 os_free(rep->con_coun_str);
351 rep->con_coun_str =
352 os_zalloc(sizeof(struct condensed_country_string));
353 if (rep->con_coun_str == NULL)
354 break;
355 os_memcpy(rep->con_coun_str->country_string, pos, 2);
356 break;
357 case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
358 if (elen < 1) {
359 wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
360 "candidate");
361 break;
362 }
363 os_free(rep->bss_tran_can);
364 rep->bss_tran_can =
365 os_zalloc(sizeof(struct bss_transition_candidate));
366 if (rep->bss_tran_can == NULL)
367 break;
368 rep->bss_tran_can->preference = pos[0];
369 break;
370 case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
371 if (elen < 10) {
372 wpa_printf(MSG_DEBUG, "WNM: Too short BSS termination "
373 "duration");
374 break;
375 }
376 os_free(rep->bss_term_dur);
377 rep->bss_term_dur =
378 os_zalloc(sizeof(struct bss_termination_duration));
379 if (rep->bss_term_dur == NULL)
380 break;
381 os_memcpy(rep->bss_term_dur->duration, pos, 10);
382 break;
383 case WNM_NEIGHBOR_BEARING:
384 if (elen < 8) {
385 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
386 "bearing");
387 break;
388 }
389 os_free(rep->bearing);
390 rep->bearing = os_zalloc(sizeof(struct bearing));
391 if (rep->bearing == NULL)
392 break;
393 os_memcpy(rep->bearing->bearing, pos, 8);
394 break;
395 case WNM_NEIGHBOR_MEASUREMENT_PILOT:
396 if (elen < 1) {
397 wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
398 "pilot");
399 break;
400 }
401 os_free(rep->meas_pilot);
402 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
403 if (rep->meas_pilot == NULL)
404 break;
405 rep->meas_pilot->measurement_pilot = pos[0];
406 rep->meas_pilot->subelem_len = elen - 1;
407 os_memcpy(rep->meas_pilot->subelems, pos + 1, elen - 1);
408 break;
409 case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
410 if (elen < 5) {
411 wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
412 "capabilities");
413 break;
414 }
415 os_free(rep->rrm_cap);
416 rep->rrm_cap =
417 os_zalloc(sizeof(struct rrm_enabled_capabilities));
418 if (rep->rrm_cap == NULL)
419 break;
420 os_memcpy(rep->rrm_cap->capabilities, pos, 5);
421 break;
422 case WNM_NEIGHBOR_MULTIPLE_BSSID:
423 if (elen < 1) {
424 wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
425 break;
426 }
427 os_free(rep->mul_bssid);
428 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
429 if (rep->mul_bssid == NULL)
430 break;
431 rep->mul_bssid->max_bssid_indicator = pos[0];
432 rep->mul_bssid->subelem_len = elen - 1;
433 os_memcpy(rep->mul_bssid->subelems, pos + 1, elen - 1);
434 break;
435 }
436 }
437
438
wnm_parse_neighbor_report(struct wpa_supplicant * wpa_s,const u8 * pos,u8 len,struct neighbor_report * rep)439 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
440 const u8 *pos, u8 len,
441 struct neighbor_report *rep)
442 {
443 u8 left = len;
444
445 if (left < 13) {
446 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
447 return;
448 }
449
450 os_memcpy(rep->bssid, pos, ETH_ALEN);
451 os_memcpy(rep->bssid_information, pos + ETH_ALEN, 4);
452 rep->regulatory_class = *(pos + 10);
453 rep->channel_number = *(pos + 11);
454 rep->phy_type = *(pos + 12);
455
456 pos += 13;
457 left -= 13;
458
459 while (left >= 2) {
460 u8 id, elen;
461
462 id = *pos++;
463 elen = *pos++;
464 wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen);
465 left -= 2;
466 if (elen > left) {
467 wpa_printf(MSG_DEBUG,
468 "WNM: Truncated neighbor report subelement");
469 break;
470 }
471 wnm_parse_neighbor_report_elem(rep, id, elen, pos);
472 left -= elen;
473 pos += elen;
474 }
475 }
476
477
compare_scan_neighbor_results(struct wpa_supplicant * wpa_s,struct wpa_scan_results * scan_res,struct neighbor_report * neigh_rep,u8 num_neigh_rep,u8 * bssid_to_connect)478 static int compare_scan_neighbor_results(struct wpa_supplicant *wpa_s,
479 struct wpa_scan_results *scan_res,
480 struct neighbor_report *neigh_rep,
481 u8 num_neigh_rep, u8 *bssid_to_connect)
482 {
483
484 u8 i, j;
485
486 if (scan_res == NULL || num_neigh_rep == 0 || !wpa_s->current_bss)
487 return 0;
488
489 wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
490 MAC2STR(wpa_s->bssid), wpa_s->current_bss->level);
491
492 for (i = 0; i < num_neigh_rep; i++) {
493 for (j = 0; j < scan_res->num; j++) {
494 /* Check for a better RSSI AP */
495 if (os_memcmp(scan_res->res[j]->bssid,
496 neigh_rep[i].bssid, ETH_ALEN) == 0 &&
497 scan_res->res[j]->level >
498 wpa_s->current_bss->level) {
499 /* Got a BSSID with better RSSI value */
500 os_memcpy(bssid_to_connect, neigh_rep[i].bssid,
501 ETH_ALEN);
502 wpa_printf(MSG_DEBUG, "Found a BSS " MACSTR
503 " with better scan RSSI %d",
504 MAC2STR(scan_res->res[j]->bssid),
505 scan_res->res[j]->level);
506 return 1;
507 }
508 wpa_printf(MSG_DEBUG, "scan_res[%d] " MACSTR
509 " RSSI %d", j,
510 MAC2STR(scan_res->res[j]->bssid),
511 scan_res->res[j]->level);
512 }
513 }
514
515 return 0;
516 }
517
518
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)519 static void wnm_send_bss_transition_mgmt_resp(
520 struct wpa_supplicant *wpa_s, u8 dialog_token,
521 enum bss_trans_mgmt_status_code status, u8 delay,
522 const u8 *target_bssid)
523 {
524 u8 buf[1000], *pos;
525 struct ieee80211_mgmt *mgmt;
526 size_t len;
527
528 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response "
529 "to " MACSTR " dialog_token=%u status=%u delay=%d",
530 MAC2STR(wpa_s->bssid), dialog_token, status, delay);
531
532 mgmt = (struct ieee80211_mgmt *) buf;
533 os_memset(&buf, 0, sizeof(buf));
534 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
535 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
536 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
537 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
538 WLAN_FC_STYPE_ACTION);
539 mgmt->u.action.category = WLAN_ACTION_WNM;
540 mgmt->u.action.u.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP;
541 mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token;
542 mgmt->u.action.u.bss_tm_resp.status_code = status;
543 mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay;
544 pos = mgmt->u.action.u.bss_tm_resp.variable;
545 if (target_bssid) {
546 os_memcpy(pos, target_bssid, ETH_ALEN);
547 pos += ETH_ALEN;
548 } else if (status == WNM_BSS_TM_ACCEPT) {
549 /*
550 * P802.11-REVmc clarifies that the Target BSSID field is always
551 * present when status code is zero, so use a fake value here if
552 * no BSSID is yet known.
553 */
554 os_memset(pos, 0, ETH_ALEN);
555 pos += ETH_ALEN;
556 }
557
558 len = pos - (u8 *) &mgmt->u.action.category;
559
560 wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
561 wpa_s->own_addr, wpa_s->bssid,
562 &mgmt->u.action.category, len, 0);
563 }
564
565
wnm_scan_response(struct wpa_supplicant * wpa_s,struct wpa_scan_results * scan_res)566 void wnm_scan_response(struct wpa_supplicant *wpa_s,
567 struct wpa_scan_results *scan_res)
568 {
569 u8 bssid[ETH_ALEN];
570
571 if (scan_res == NULL) {
572 wpa_printf(MSG_ERROR, "Scan result is NULL");
573 goto send_bss_resp_fail;
574 }
575
576 /* Compare the Neighbor Report and scan results */
577 if (compare_scan_neighbor_results(wpa_s, scan_res,
578 wpa_s->wnm_neighbor_report_elements,
579 wpa_s->wnm_num_neighbor_report,
580 bssid) == 1) {
581 /* Associate to the network */
582 struct wpa_bss *bss;
583 struct wpa_ssid *ssid = wpa_s->current_ssid;
584
585 bss = wpa_bss_get_bssid(wpa_s, bssid);
586 if (!bss) {
587 wpa_printf(MSG_DEBUG, "WNM: Target AP not found from "
588 "BSS table");
589 goto send_bss_resp_fail;
590 }
591
592 /* Send the BSS Management Response - Accept */
593 if (wpa_s->wnm_reply) {
594 wnm_send_bss_transition_mgmt_resp(wpa_s,
595 wpa_s->wnm_dialog_token,
596 WNM_BSS_TM_ACCEPT,
597 0, bssid);
598 }
599
600 wpa_s->reassociate = 1;
601 wpa_supplicant_connect(wpa_s, bss, ssid);
602 wnm_deallocate_memory(wpa_s);
603 return;
604 }
605
606 /* Send reject response for all the failures */
607 send_bss_resp_fail:
608 wnm_deallocate_memory(wpa_s);
609 if (wpa_s->wnm_reply) {
610 wnm_send_bss_transition_mgmt_resp(wpa_s,
611 wpa_s->wnm_dialog_token,
612 WNM_BSS_TM_REJECT_UNSPECIFIED,
613 0, NULL);
614 }
615 return;
616 }
617
618
ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant * wpa_s,const u8 * pos,const u8 * end,int reply)619 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
620 const u8 *pos, const u8 *end,
621 int reply)
622 {
623 if (pos + 5 > end)
624 return;
625
626 wpa_s->wnm_dialog_token = pos[0];
627 wpa_s->wnm_mode = pos[1];
628 wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
629 wpa_s->wnm_validity_interval = pos[4];
630 wpa_s->wnm_reply = reply;
631
632 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
633 "dialog_token=%u request_mode=0x%x "
634 "disassoc_timer=%u validity_interval=%u",
635 wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
636 wpa_s->wnm_dissoc_timer, wpa_s->wnm_validity_interval);
637
638 pos += 5;
639
640 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
641 if (pos + 12 > end) {
642 wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
643 return;
644 }
645 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
646 pos += 12; /* BSS Termination Duration */
647 }
648
649 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
650 char url[256];
651 unsigned int beacon_int;
652
653 if (pos + 1 > end || pos + 1 + pos[0] > end) {
654 wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
655 "Management Request (URL)");
656 return;
657 }
658 os_memcpy(url, pos + 1, pos[0]);
659 url[pos[0]] = '\0';
660 pos += 1 + pos[0];
661
662 if (wpa_s->current_bss)
663 beacon_int = wpa_s->current_bss->beacon_int;
664 else
665 beacon_int = 100; /* best guess */
666
667 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
668 wpa_sm_pmf_enabled(wpa_s->wpa),
669 wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
670 }
671
672 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
673 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
674 "Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
675 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) {
676 /* TODO: mark current BSS less preferred for
677 * selection */
678 wpa_printf(MSG_DEBUG, "Trying to find another BSS");
679 wpa_supplicant_req_scan(wpa_s, 0, 0);
680 }
681 }
682
683 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
684 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
685 wpa_s->wnm_num_neighbor_report = 0;
686 os_free(wpa_s->wnm_neighbor_report_elements);
687 wpa_s->wnm_neighbor_report_elements = os_zalloc(
688 WNM_MAX_NEIGHBOR_REPORT *
689 sizeof(struct neighbor_report));
690 if (wpa_s->wnm_neighbor_report_elements == NULL)
691 return;
692
693 while (pos + 2 <= end &&
694 wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
695 {
696 u8 tag = *pos++;
697 u8 len = *pos++;
698
699 wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
700 tag);
701 if (pos + len > end) {
702 wpa_printf(MSG_DEBUG, "WNM: Truncated request");
703 return;
704 }
705 if (tag == WLAN_EID_NEIGHBOR_REPORT) {
706 struct neighbor_report *rep;
707 rep = &wpa_s->wnm_neighbor_report_elements[
708 wpa_s->wnm_num_neighbor_report];
709 wnm_parse_neighbor_report(wpa_s, pos, len, rep);
710 }
711
712 pos += len;
713 wpa_s->wnm_num_neighbor_report++;
714 }
715
716 wpa_s->scan_res_handler = wnm_scan_response;
717 wpa_supplicant_req_scan(wpa_s, 0, 0);
718 } else if (reply) {
719 enum bss_trans_mgmt_status_code status;
720 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT)
721 status = WNM_BSS_TM_ACCEPT;
722 else {
723 wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates");
724 status = WNM_BSS_TM_REJECT_UNSPECIFIED;
725 }
726 wnm_send_bss_transition_mgmt_resp(wpa_s,
727 wpa_s->wnm_dialog_token,
728 status, 0, NULL);
729 }
730 }
731
732
wnm_send_bss_transition_mgmt_query(struct wpa_supplicant * wpa_s,u8 query_reason)733 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
734 u8 query_reason)
735 {
736 u8 buf[1000], *pos;
737 struct ieee80211_mgmt *mgmt;
738 size_t len;
739 int ret;
740
741 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
742 MACSTR " query_reason=%u",
743 MAC2STR(wpa_s->bssid), query_reason);
744
745 mgmt = (struct ieee80211_mgmt *) buf;
746 os_memset(&buf, 0, sizeof(buf));
747 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
748 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
749 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
750 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
751 WLAN_FC_STYPE_ACTION);
752 mgmt->u.action.category = WLAN_ACTION_WNM;
753 mgmt->u.action.u.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY;
754 mgmt->u.action.u.bss_tm_query.dialog_token = 1;
755 mgmt->u.action.u.bss_tm_query.query_reason = query_reason;
756 pos = mgmt->u.action.u.bss_tm_query.variable;
757
758 len = pos - (u8 *) &mgmt->u.action.category;
759
760 ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
761 wpa_s->own_addr, wpa_s->bssid,
762 &mgmt->u.action.category, len, 0);
763
764 return ret;
765 }
766
767
ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant * wpa_s,const u8 * sa,const u8 * data,int len)768 static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s,
769 const u8 *sa, const u8 *data,
770 int len)
771 {
772 const u8 *pos, *end, *next;
773 u8 ie, ie_len;
774
775 pos = data;
776 end = data + len;
777
778 while (pos + 1 < end) {
779 ie = *pos++;
780 ie_len = *pos++;
781 wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u",
782 ie, ie_len);
783 if (ie_len > end - pos) {
784 wpa_printf(MSG_DEBUG, "WNM: Not enough room for "
785 "subelement");
786 break;
787 }
788 next = pos + ie_len;
789 if (ie_len < 4) {
790 pos = next;
791 continue;
792 }
793 wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u",
794 WPA_GET_BE24(pos), pos[3]);
795
796 #ifdef CONFIG_HS20
797 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
798 WPA_GET_BE24(pos) == OUI_WFA &&
799 pos[3] == HS20_WNM_SUB_REM_NEEDED) {
800 /* Subscription Remediation subelement */
801 const u8 *ie_end;
802 u8 url_len;
803 char *url;
804 u8 osu_method;
805
806 wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation "
807 "subelement");
808 ie_end = pos + ie_len;
809 pos += 4;
810 url_len = *pos++;
811 if (url_len == 0) {
812 wpa_printf(MSG_DEBUG, "WNM: No Server URL included");
813 url = NULL;
814 osu_method = 1;
815 } else {
816 if (pos + url_len + 1 > ie_end) {
817 wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)",
818 url_len,
819 (int) (ie_end - pos));
820 break;
821 }
822 url = os_malloc(url_len + 1);
823 if (url == NULL)
824 break;
825 os_memcpy(url, pos, url_len);
826 url[url_len] = '\0';
827 osu_method = pos[url_len];
828 }
829 hs20_rx_subscription_remediation(wpa_s, url,
830 osu_method);
831 os_free(url);
832 pos = next;
833 continue;
834 }
835
836 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 &&
837 WPA_GET_BE24(pos) == OUI_WFA &&
838 pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) {
839 const u8 *ie_end;
840 u8 url_len;
841 char *url;
842 u8 code;
843 u16 reauth_delay;
844
845 ie_end = pos + ie_len;
846 pos += 4;
847 code = *pos++;
848 reauth_delay = WPA_GET_LE16(pos);
849 pos += 2;
850 url_len = *pos++;
851 wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication "
852 "Imminent - Reason Code %u "
853 "Re-Auth Delay %u URL Length %u",
854 code, reauth_delay, url_len);
855 if (pos + url_len > ie_end)
856 break;
857 url = os_malloc(url_len + 1);
858 if (url == NULL)
859 break;
860 os_memcpy(url, pos, url_len);
861 url[url_len] = '\0';
862 hs20_rx_deauth_imminent_notice(wpa_s, code,
863 reauth_delay, url);
864 os_free(url);
865 pos = next;
866 continue;
867 }
868 #endif /* CONFIG_HS20 */
869
870 pos = next;
871 }
872 }
873
874
ieee802_11_rx_wnm_notif_req(struct wpa_supplicant * wpa_s,const u8 * sa,const u8 * frm,int len)875 static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s,
876 const u8 *sa, const u8 *frm, int len)
877 {
878 const u8 *pos, *end;
879 u8 dialog_token, type;
880
881 /* Dialog Token [1] | Type [1] | Subelements */
882
883 if (len < 2 || sa == NULL)
884 return;
885 end = frm + len;
886 pos = frm;
887 dialog_token = *pos++;
888 type = *pos++;
889
890 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request "
891 "(dialog_token %u type %u sa " MACSTR ")",
892 dialog_token, type, MAC2STR(sa));
893 wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements",
894 pos, end - pos);
895
896 if (wpa_s->wpa_state != WPA_COMPLETED ||
897 os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
898 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not "
899 "from our AP - ignore it");
900 return;
901 }
902
903 switch (type) {
904 case 1:
905 ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos);
906 break;
907 default:
908 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown "
909 "WNM-Notification type %u", type);
910 break;
911 }
912 }
913
914
ieee802_11_rx_wnm_action(struct wpa_supplicant * wpa_s,const struct ieee80211_mgmt * mgmt,size_t len)915 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
916 const struct ieee80211_mgmt *mgmt, size_t len)
917 {
918 const u8 *pos, *end;
919 u8 act;
920
921 if (len < IEEE80211_HDRLEN + 2)
922 return;
923
924 pos = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 1;
925 act = *pos++;
926 end = ((const u8 *) mgmt) + len;
927
928 wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
929 act, MAC2STR(mgmt->sa));
930 if (wpa_s->wpa_state < WPA_ASSOCIATED ||
931 os_memcmp(mgmt->sa, wpa_s->bssid, ETH_ALEN) != 0) {
932 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
933 "frame");
934 return;
935 }
936
937 switch (act) {
938 case WNM_BSS_TRANS_MGMT_REQ:
939 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
940 !(mgmt->da[0] & 0x01));
941 break;
942 case WNM_SLEEP_MODE_RESP:
943 ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos);
944 break;
945 case WNM_NOTIFICATION_REQ:
946 ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos);
947 break;
948 default:
949 wpa_printf(MSG_ERROR, "WNM: Unknown request");
950 break;
951 }
952 }
953