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
22 #define MAX_TFS_IE_LEN 1024
23 #define WNM_MAX_NEIGHBOR_REPORT 10
24
25
26 /* 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)27 static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
28 u16 *buf_len, enum wnm_oper oper)
29 {
30 wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
31
32 return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
33 }
34
35
36 /* 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)37 static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
38 const u8 *addr, u8 *buf, u16 *buf_len,
39 enum wnm_oper oper)
40 {
41 wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
42
43 return wpa_drv_wnm_oper(wpa_s, oper, addr, buf, buf_len);
44 }
45
46
47 /* MLME-SLEEPMODE.request */
ieee802_11_send_wnmsleep_req(struct wpa_supplicant * wpa_s,u8 action,u16 intval,struct wpabuf * tfs_req)48 int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
49 u8 action, u16 intval, struct wpabuf *tfs_req)
50 {
51 struct ieee80211_mgmt *mgmt;
52 int res;
53 size_t len;
54 struct wnm_sleep_element *wnmsleep_ie;
55 u8 *wnmtfs_ie;
56 u8 wnmsleep_ie_len;
57 u16 wnmtfs_ie_len; /* possibly multiple IE(s) */
58 enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
59 WNM_SLEEP_TFS_REQ_IE_NONE;
60
61 wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request "
62 "action=%s to " MACSTR,
63 action == 0 ? "enter" : "exit",
64 MAC2STR(wpa_s->bssid));
65
66 /* WNM-Sleep Mode IE */
67 wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
68 wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
69 if (wnmsleep_ie == NULL)
70 return -1;
71 wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
72 wnmsleep_ie->len = wnmsleep_ie_len - 2;
73 wnmsleep_ie->action_type = action;
74 wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
75 wnmsleep_ie->intval = host_to_le16(intval);
76 wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element",
77 (u8 *) wnmsleep_ie, wnmsleep_ie_len);
78
79 /* TFS IE(s) */
80 if (tfs_req) {
81 wnmtfs_ie_len = wpabuf_len(tfs_req);
82 wnmtfs_ie = os_malloc(wnmtfs_ie_len);
83 if (wnmtfs_ie == NULL) {
84 os_free(wnmsleep_ie);
85 return -1;
86 }
87 os_memcpy(wnmtfs_ie, wpabuf_head(tfs_req), wnmtfs_ie_len);
88 } else {
89 wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
90 if (wnmtfs_ie == NULL) {
91 os_free(wnmsleep_ie);
92 return -1;
93 }
94 if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
95 tfs_oper)) {
96 wnmtfs_ie_len = 0;
97 os_free(wnmtfs_ie);
98 wnmtfs_ie = NULL;
99 }
100 }
101 wpa_hexdump(MSG_DEBUG, "WNM: TFS Request element",
102 (u8 *) wnmtfs_ie, wnmtfs_ie_len);
103
104 mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len);
105 if (mgmt == NULL) {
106 wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
107 "WNM-Sleep Request action frame");
108 os_free(wnmsleep_ie);
109 os_free(wnmtfs_ie);
110 return -1;
111 }
112
113 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
114 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
115 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
116 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
117 WLAN_FC_STYPE_ACTION);
118 mgmt->u.action.category = WLAN_ACTION_WNM;
119 mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ;
120 mgmt->u.action.u.wnm_sleep_req.dialogtoken = 1;
121 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
122 wnmsleep_ie_len);
123 /* copy TFS IE here */
124 if (wnmtfs_ie_len > 0) {
125 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
126 wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
127 }
128
129 len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
130 wnmtfs_ie_len;
131
132 res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
133 wpa_s->own_addr, wpa_s->bssid,
134 &mgmt->u.action.category, len, 0);
135 if (res < 0)
136 wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
137 "(action=%d, intval=%d)", action, intval);
138
139 os_free(wnmsleep_ie);
140 os_free(wnmtfs_ie);
141 os_free(mgmt);
142
143 return res;
144 }
145
146
wnm_sleep_mode_enter_success(struct wpa_supplicant * wpa_s,u8 * tfsresp_ie_start,u8 * tfsresp_ie_end)147 static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s,
148 u8 *tfsresp_ie_start,
149 u8 *tfsresp_ie_end)
150 {
151 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
152 wpa_s->bssid, NULL, NULL);
153 /* remove GTK/IGTK ?? */
154
155 /* set the TFS Resp IE(s) */
156 if (tfsresp_ie_start && tfsresp_ie_end &&
157 tfsresp_ie_end - tfsresp_ie_start >= 0) {
158 u16 tfsresp_ie_len;
159 tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) -
160 tfsresp_ie_start;
161 wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
162 /* pass the TFS Resp IE(s) to driver for processing */
163 if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid,
164 tfsresp_ie_start,
165 &tfsresp_ie_len,
166 WNM_SLEEP_TFS_RESP_IE_SET))
167 wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE");
168 }
169 }
170
171
wnm_sleep_mode_exit_success(struct wpa_supplicant * wpa_s,const u8 * frm,u16 key_len_total)172 static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
173 const u8 *frm, u16 key_len_total)
174 {
175 u8 *ptr, *end;
176 u8 gtk_len;
177
178 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM, wpa_s->bssid,
179 NULL, NULL);
180
181 /* Install GTK/IGTK */
182
183 /* point to key data field */
184 ptr = (u8 *) frm + 1 + 1 + 2;
185 end = ptr + key_len_total;
186 wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
187
188 while (ptr + 1 < end) {
189 if (ptr + 2 + ptr[1] > end) {
190 wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
191 "length");
192 if (end > ptr) {
193 wpa_hexdump(MSG_DEBUG, "WNM: Remaining data",
194 ptr, end - ptr);
195 }
196 break;
197 }
198 if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
199 if (ptr[1] < 11 + 5) {
200 wpa_printf(MSG_DEBUG, "WNM: Too short GTK "
201 "subelem");
202 break;
203 }
204 gtk_len = *(ptr + 4);
205 if (ptr[1] < 11 + gtk_len ||
206 gtk_len < 5 || gtk_len > 32) {
207 wpa_printf(MSG_DEBUG, "WNM: Invalid GTK "
208 "subelem");
209 break;
210 }
211 wpa_wnmsleep_install_key(
212 wpa_s->wpa,
213 WNM_SLEEP_SUBELEM_GTK,
214 ptr);
215 ptr += 13 + gtk_len;
216 #ifdef CONFIG_IEEE80211W
217 } else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) {
218 if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) {
219 wpa_printf(MSG_DEBUG, "WNM: Too short IGTK "
220 "subelem");
221 break;
222 }
223 wpa_wnmsleep_install_key(wpa_s->wpa,
224 WNM_SLEEP_SUBELEM_IGTK, ptr);
225 ptr += 10 + WPA_IGTK_LEN;
226 #endif /* CONFIG_IEEE80211W */
227 } else
228 break; /* skip the loop */
229 }
230 }
231
232
ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant * wpa_s,const u8 * frm,int len)233 static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
234 const u8 *frm, int len)
235 {
236 /*
237 * Action [1] | Diaglog Token [1] | Key Data Len [2] | Key Data |
238 * WNM-Sleep Mode IE | TFS Response IE
239 */
240 u8 *pos = (u8 *) frm; /* point to action field */
241 u16 key_len_total = le_to_host16(*((u16 *)(frm+2)));
242 struct wnm_sleep_element *wnmsleep_ie = NULL;
243 /* multiple TFS Resp IE (assuming consecutive) */
244 u8 *tfsresp_ie_start = NULL;
245 u8 *tfsresp_ie_end = NULL;
246
247 wpa_printf(MSG_DEBUG, "action=%d token = %d key_len_total = %d",
248 frm[0], frm[1], key_len_total);
249 pos += 4 + key_len_total;
250 if (pos > frm + len) {
251 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
252 return;
253 }
254 while (pos - frm < len) {
255 u8 ie_len = *(pos + 1);
256 if (pos + 2 + ie_len > frm + len) {
257 wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
258 break;
259 }
260 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
261 if (*pos == WLAN_EID_WNMSLEEP)
262 wnmsleep_ie = (struct wnm_sleep_element *) pos;
263 else if (*pos == WLAN_EID_TFS_RESP) {
264 if (!tfsresp_ie_start)
265 tfsresp_ie_start = pos;
266 tfsresp_ie_end = pos;
267 } else
268 wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
269 pos += ie_len + 2;
270 }
271
272 if (!wnmsleep_ie) {
273 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
274 return;
275 }
276
277 if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
278 wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
279 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
280 "frame (action=%d, intval=%d)",
281 wnmsleep_ie->action_type, wnmsleep_ie->intval);
282 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
283 wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
284 tfsresp_ie_end);
285 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
286 wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
287 }
288 } else {
289 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
290 "(action=%d, intval=%d)",
291 wnmsleep_ie->action_type, wnmsleep_ie->intval);
292 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
293 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
294 wpa_s->bssid, NULL, NULL);
295 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
296 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
297 wpa_s->bssid, NULL, NULL);
298 }
299 }
300
301
wnm_deallocate_memory(struct wpa_supplicant * wpa_s)302 void wnm_deallocate_memory(struct wpa_supplicant *wpa_s)
303 {
304 int i;
305
306 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
307 os_free(wpa_s->wnm_neighbor_report_elements[i].tsf_info);
308 os_free(wpa_s->wnm_neighbor_report_elements[i].con_coun_str);
309 os_free(wpa_s->wnm_neighbor_report_elements[i].bss_tran_can);
310 os_free(wpa_s->wnm_neighbor_report_elements[i].bss_term_dur);
311 os_free(wpa_s->wnm_neighbor_report_elements[i].bearing);
312 os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot);
313 os_free(wpa_s->wnm_neighbor_report_elements[i].rrm_cap);
314 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid);
315 }
316
317 os_free(wpa_s->wnm_neighbor_report_elements);
318 wpa_s->wnm_neighbor_report_elements = NULL;
319 }
320
321
wnm_parse_neighbor_report_elem(struct neighbor_report * rep,u8 id,u8 elen,const u8 * pos)322 static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep,
323 u8 id, u8 elen, const u8 *pos)
324 {
325 switch (id) {
326 case WNM_NEIGHBOR_TSF:
327 if (elen < 2 + 2) {
328 wpa_printf(MSG_DEBUG, "WNM: Too short TSF");
329 break;
330 }
331 rep->tsf_info = os_zalloc(sizeof(struct tsf_info));
332 if (rep->tsf_info == NULL)
333 break;
334 rep->tsf_info->present = 1;
335 os_memcpy(rep->tsf_info->tsf_offset, pos, 2);
336 os_memcpy(rep->tsf_info->beacon_interval, pos + 2, 2);
337 break;
338 case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
339 if (elen < 2) {
340 wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
341 "country string");
342 break;
343 }
344 rep->con_coun_str =
345 os_zalloc(sizeof(struct condensed_country_string));
346 if (rep->con_coun_str == NULL)
347 break;
348 rep->con_coun_str->present = 1;
349 os_memcpy(rep->con_coun_str->country_string, pos, 2);
350 break;
351 case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
352 if (elen < 1) {
353 wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
354 "candidate");
355 break;
356 }
357 rep->bss_tran_can =
358 os_zalloc(sizeof(struct bss_transition_candidate));
359 if (rep->bss_tran_can == NULL)
360 break;
361 rep->bss_tran_can->present = 1;
362 rep->bss_tran_can->preference = pos[0];
363 break;
364 case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
365 if (elen < 12) {
366 wpa_printf(MSG_DEBUG, "WNM: Too short BSS termination "
367 "duration");
368 break;
369 }
370 rep->bss_term_dur =
371 os_zalloc(sizeof(struct bss_termination_duration));
372 if (rep->bss_term_dur == NULL)
373 break;
374 rep->bss_term_dur->present = 1;
375 os_memcpy(rep->bss_term_dur->duration, pos, 12);
376 break;
377 case WNM_NEIGHBOR_BEARING:
378 if (elen < 8) {
379 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
380 "bearing");
381 break;
382 }
383 rep->bearing = os_zalloc(sizeof(struct bearing));
384 if (rep->bearing == NULL)
385 break;
386 rep->bearing->present = 1;
387 os_memcpy(rep->bearing->bearing, pos, 8);
388 break;
389 case WNM_NEIGHBOR_MEASUREMENT_PILOT:
390 if (elen < 2) {
391 wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
392 "pilot");
393 break;
394 }
395 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
396 if (rep->meas_pilot == NULL)
397 break;
398 rep->meas_pilot->present = 1;
399 rep->meas_pilot->measurement_pilot = pos[0];
400 rep->meas_pilot->num_vendor_specific = pos[1];
401 os_memcpy(rep->meas_pilot->vendor_specific, pos + 2, elen - 2);
402 break;
403 case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
404 if (elen < 4) {
405 wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
406 "capabilities");
407 break;
408 }
409 rep->rrm_cap =
410 os_zalloc(sizeof(struct rrm_enabled_capabilities));
411 if (rep->rrm_cap == NULL)
412 break;
413 rep->rrm_cap->present = 1;
414 os_memcpy(rep->rrm_cap->capabilities, pos, 4);
415 break;
416 case WNM_NEIGHBOR_MULTIPLE_BSSID:
417 if (elen < 2) {
418 wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
419 break;
420 }
421 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
422 if (rep->mul_bssid == NULL)
423 break;
424 rep->mul_bssid->present = 1;
425 rep->mul_bssid->max_bssid_indicator = pos[0];
426 rep->mul_bssid->num_vendor_specific = pos[1];
427 os_memcpy(rep->mul_bssid->vendor_specific, pos + 2, elen - 2);
428 break;
429 }
430 }
431
432
wnm_parse_neighbor_report(struct wpa_supplicant * wpa_s,const u8 * pos,u8 len,struct neighbor_report * rep)433 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
434 const u8 *pos, u8 len,
435 struct neighbor_report *rep)
436 {
437 u8 left = len;
438
439 if (left < 13) {
440 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
441 return;
442 }
443
444 os_memcpy(rep->bssid, pos, ETH_ALEN);
445 os_memcpy(rep->bssid_information, pos + ETH_ALEN, 4);
446 rep->regulatory_class = *(pos + 10);
447 rep->channel_number = *(pos + 11);
448 rep->phy_type = *(pos + 12);
449
450 pos += 13;
451 left -= 13;
452
453 while (left >= 2) {
454 u8 id, elen;
455
456 id = *pos++;
457 elen = *pos++;
458 wnm_parse_neighbor_report_elem(rep, id, elen, pos);
459 left -= 2 + elen;
460 pos += elen;
461 }
462 }
463
464
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)465 static int compare_scan_neighbor_results(struct wpa_supplicant *wpa_s,
466 struct wpa_scan_results *scan_res,
467 struct neighbor_report *neigh_rep,
468 u8 num_neigh_rep, u8 *bssid_to_connect)
469 {
470
471 u8 i, j;
472
473 if (scan_res == NULL || num_neigh_rep == 0)
474 return 0;
475
476 for (i = 0; i < num_neigh_rep; i++) {
477 for (j = 0; j < scan_res->num; j++) {
478 /* Check for a better RSSI AP */
479 if (os_memcmp(scan_res->res[j]->bssid,
480 neigh_rep[i].bssid, ETH_ALEN) == 0 &&
481 scan_res->res[j]->level >
482 wpa_s->current_bss->level) {
483 /* Got a BSSID with better RSSI value */
484 os_memcpy(bssid_to_connect, neigh_rep[i].bssid,
485 ETH_ALEN);
486 return 1;
487 }
488 }
489 }
490
491 return 0;
492 }
493
494
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)495 static void wnm_send_bss_transition_mgmt_resp(
496 struct wpa_supplicant *wpa_s, u8 dialog_token,
497 enum bss_trans_mgmt_status_code status, u8 delay,
498 const u8 *target_bssid)
499 {
500 u8 buf[1000], *pos;
501 struct ieee80211_mgmt *mgmt;
502 size_t len;
503
504 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response "
505 "to " MACSTR " dialog_token=%u status=%u delay=%d",
506 MAC2STR(wpa_s->bssid), dialog_token, status, delay);
507
508 mgmt = (struct ieee80211_mgmt *) buf;
509 os_memset(&buf, 0, sizeof(buf));
510 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
511 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
512 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
513 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
514 WLAN_FC_STYPE_ACTION);
515 mgmt->u.action.category = WLAN_ACTION_WNM;
516 mgmt->u.action.u.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP;
517 mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token;
518 mgmt->u.action.u.bss_tm_resp.status_code = status;
519 mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay;
520 pos = mgmt->u.action.u.bss_tm_resp.variable;
521 if (target_bssid) {
522 os_memcpy(pos, target_bssid, ETH_ALEN);
523 pos += ETH_ALEN;
524 }
525
526 len = pos - (u8 *) &mgmt->u.action.category;
527
528 wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
529 wpa_s->own_addr, wpa_s->bssid,
530 &mgmt->u.action.category, len, 0);
531 }
532
533
wnm_scan_response(struct wpa_supplicant * wpa_s,struct wpa_scan_results * scan_res)534 void wnm_scan_response(struct wpa_supplicant *wpa_s,
535 struct wpa_scan_results *scan_res)
536 {
537 u8 bssid[ETH_ALEN];
538
539 if (scan_res == NULL) {
540 wpa_printf(MSG_ERROR, "Scan result is NULL");
541 goto send_bss_resp_fail;
542 }
543
544 /* Compare the Neighbor Report and scan results */
545 if (compare_scan_neighbor_results(wpa_s, scan_res,
546 wpa_s->wnm_neighbor_report_elements,
547 wpa_s->wnm_num_neighbor_report,
548 bssid) == 1) {
549 /* Associate to the network */
550 struct wpa_bss *bss;
551 struct wpa_ssid *ssid = wpa_s->current_ssid;
552
553 bss = wpa_bss_get_bssid(wpa_s, bssid);
554 if (!bss) {
555 wpa_printf(MSG_DEBUG, "WNM: Target AP not found from "
556 "BSS table");
557 goto send_bss_resp_fail;
558 }
559
560 /* Send the BSS Management Response - Accept */
561 if (wpa_s->wnm_reply) {
562 wnm_send_bss_transition_mgmt_resp(wpa_s,
563 wpa_s->wnm_dialog_token,
564 WNM_BSS_TM_ACCEPT,
565 0, NULL);
566 }
567
568 wpa_s->reassociate = 1;
569 wpa_supplicant_connect(wpa_s, bss, ssid);
570 wnm_deallocate_memory(wpa_s);
571 return;
572 }
573
574 /* Send reject response for all the failures */
575 send_bss_resp_fail:
576 wnm_deallocate_memory(wpa_s);
577 if (wpa_s->wnm_reply) {
578 wnm_send_bss_transition_mgmt_resp(wpa_s,
579 wpa_s->wnm_dialog_token,
580 WNM_BSS_TM_REJECT_UNSPECIFIED,
581 0, NULL);
582 }
583 return;
584 }
585
586
ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant * wpa_s,const u8 * pos,const u8 * end,int reply)587 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
588 const u8 *pos, const u8 *end,
589 int reply)
590 {
591 if (pos + 5 > end)
592 return;
593
594 wpa_s->wnm_dialog_token = pos[0];
595 wpa_s->wnm_mode = pos[1];
596 wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
597 wpa_s->wnm_validity_interval = pos[4];
598 wpa_s->wnm_reply = reply;
599
600 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
601 "dialog_token=%u request_mode=0x%x "
602 "disassoc_timer=%u validity_interval=%u",
603 wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
604 wpa_s->wnm_dissoc_timer, wpa_s->wnm_validity_interval);
605
606 pos += 5;
607
608 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
609 if (pos + 12 > end) {
610 wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
611 return;
612 }
613 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
614 pos += 12; /* BSS Termination Duration */
615 }
616
617 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
618 char url[256];
619 unsigned int beacon_int;
620
621 if (pos + 1 > end || pos + 1 + pos[0] > end) {
622 wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
623 "Management Request (URL)");
624 return;
625 }
626 os_memcpy(url, pos + 1, pos[0]);
627 url[pos[0]] = '\0';
628 pos += 1 + pos[0];
629
630 if (wpa_s->current_bss)
631 beacon_int = wpa_s->current_bss->beacon_int;
632 else
633 beacon_int = 100; /* best guess */
634
635 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
636 wpa_sm_pmf_enabled(wpa_s->wpa),
637 wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
638 }
639
640 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
641 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
642 "Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
643 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) {
644 /* TODO: mark current BSS less preferred for
645 * selection */
646 wpa_printf(MSG_DEBUG, "Trying to find another BSS");
647 wpa_supplicant_req_scan(wpa_s, 0, 0);
648 }
649 }
650
651 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
652 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
653 wpa_s->wnm_num_neighbor_report = 0;
654 os_free(wpa_s->wnm_neighbor_report_elements);
655 wpa_s->wnm_neighbor_report_elements = os_zalloc(
656 WNM_MAX_NEIGHBOR_REPORT *
657 sizeof(struct neighbor_report));
658 if (wpa_s->wnm_neighbor_report_elements == NULL)
659 return;
660
661 while (pos + 2 <= end &&
662 wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
663 {
664 u8 tag = *pos++;
665 u8 len = *pos++;
666
667 wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
668 tag);
669 if (pos + len > end) {
670 wpa_printf(MSG_DEBUG, "WNM: Truncated request");
671 return;
672 }
673 wnm_parse_neighbor_report(
674 wpa_s, pos, len,
675 &wpa_s->wnm_neighbor_report_elements[
676 wpa_s->wnm_num_neighbor_report]);
677
678 pos += len;
679 wpa_s->wnm_num_neighbor_report++;
680 }
681
682 wpa_s->scan_res_handler = wnm_scan_response;
683 wpa_supplicant_req_scan(wpa_s, 0, 0);
684 } else if (reply) {
685 enum bss_trans_mgmt_status_code status;
686 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT)
687 status = WNM_BSS_TM_ACCEPT;
688 else {
689 wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates");
690 status = WNM_BSS_TM_REJECT_UNSPECIFIED;
691 }
692 wnm_send_bss_transition_mgmt_resp(wpa_s,
693 wpa_s->wnm_dialog_token,
694 status, 0, NULL);
695 }
696 }
697
698
wnm_send_bss_transition_mgmt_query(struct wpa_supplicant * wpa_s,u8 query_reason)699 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
700 u8 query_reason)
701 {
702 u8 buf[1000], *pos;
703 struct ieee80211_mgmt *mgmt;
704 size_t len;
705 int ret;
706
707 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
708 MACSTR " query_reason=%u",
709 MAC2STR(wpa_s->bssid), query_reason);
710
711 mgmt = (struct ieee80211_mgmt *) buf;
712 os_memset(&buf, 0, sizeof(buf));
713 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
714 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
715 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
716 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
717 WLAN_FC_STYPE_ACTION);
718 mgmt->u.action.category = WLAN_ACTION_WNM;
719 mgmt->u.action.u.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY;
720 mgmt->u.action.u.bss_tm_query.dialog_token = 0;
721 mgmt->u.action.u.bss_tm_query.query_reason = query_reason;
722 pos = mgmt->u.action.u.bss_tm_query.variable;
723
724 len = pos - (u8 *) &mgmt->u.action.category;
725
726 ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
727 wpa_s->own_addr, wpa_s->bssid,
728 &mgmt->u.action.category, len, 0);
729
730 return ret;
731 }
732
733
ieee802_11_rx_wnm_action(struct wpa_supplicant * wpa_s,struct rx_action * action)734 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
735 struct rx_action *action)
736 {
737 const u8 *pos, *end;
738 u8 act;
739
740 if (action->data == NULL || action->len == 0)
741 return;
742
743 pos = action->data;
744 end = pos + action->len;
745 act = *pos++;
746
747 wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
748 act, MAC2STR(action->sa));
749 if (wpa_s->wpa_state < WPA_ASSOCIATED ||
750 os_memcmp(action->sa, wpa_s->bssid, ETH_ALEN) != 0) {
751 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
752 "frame");
753 return;
754 }
755
756 switch (act) {
757 case WNM_BSS_TRANS_MGMT_REQ:
758 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
759 !(action->da[0] & 0x01));
760 break;
761 case WNM_SLEEP_MODE_RESP:
762 ieee802_11_rx_wnmsleep_resp(wpa_s, action->data, action->len);
763 break;
764 default:
765 wpa_printf(MSG_ERROR, "WNM: Unknown request");
766 break;
767 }
768 }
769