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 "common/ocv.h"
16 #include "rsn_supp/wpa.h"
17 #include "config.h"
18 #include "wpa_supplicant_i.h"
19 #include "driver_i.h"
20 #include "scan.h"
21 #include "ctrl_iface.h"
22 #include "bss.h"
23 #include "wnm_sta.h"
24 #include "notify.h"
25 #include "hs20_supplicant.h"
26
27 #define MAX_TFS_IE_LEN 1024
28 #define WNM_MAX_NEIGHBOR_REPORT 10
29
30 #define WNM_SCAN_RESULT_AGE 2 /* 2 seconds */
31
32 /* 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)33 static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
34 u16 *buf_len, enum wnm_oper oper)
35 {
36 wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
37
38 return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
39 }
40
41
42 /* 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)43 static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
44 const u8 *addr, const u8 *buf, u16 buf_len,
45 enum wnm_oper oper)
46 {
47 u16 len = buf_len;
48
49 wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
50
51 return wpa_drv_wnm_oper(wpa_s, oper, addr, (u8 *) buf, &len);
52 }
53
54
55 /* MLME-SLEEPMODE.request */
ieee802_11_send_wnmsleep_req(struct wpa_supplicant * wpa_s,u8 action,u16 intval,struct wpabuf * tfs_req)56 int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
57 u8 action, u16 intval, struct wpabuf *tfs_req)
58 {
59 struct ieee80211_mgmt *mgmt;
60 int res;
61 size_t len;
62 struct wnm_sleep_element *wnmsleep_ie;
63 u8 *wnmtfs_ie, *oci_ie;
64 u8 wnmsleep_ie_len, oci_ie_len;
65 u16 wnmtfs_ie_len; /* possibly multiple IE(s) */
66 enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
67 WNM_SLEEP_TFS_REQ_IE_NONE;
68
69 wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request "
70 "action=%s to " MACSTR,
71 action == 0 ? "enter" : "exit",
72 MAC2STR(wpa_s->bssid));
73
74 /* WNM-Sleep Mode IE */
75 wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
76 wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
77 if (wnmsleep_ie == NULL)
78 return -1;
79 wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
80 wnmsleep_ie->len = wnmsleep_ie_len - 2;
81 wnmsleep_ie->action_type = action;
82 wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
83 wnmsleep_ie->intval = host_to_le16(intval);
84 wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element",
85 (u8 *) wnmsleep_ie, wnmsleep_ie_len);
86
87 /* TFS IE(s) */
88 if (tfs_req) {
89 wnmtfs_ie_len = wpabuf_len(tfs_req);
90 wnmtfs_ie = os_memdup(wpabuf_head(tfs_req), wnmtfs_ie_len);
91 if (wnmtfs_ie == NULL) {
92 os_free(wnmsleep_ie);
93 return -1;
94 }
95 } else {
96 wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
97 if (wnmtfs_ie == NULL) {
98 os_free(wnmsleep_ie);
99 return -1;
100 }
101 if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
102 tfs_oper)) {
103 wnmtfs_ie_len = 0;
104 os_free(wnmtfs_ie);
105 wnmtfs_ie = NULL;
106 }
107 }
108 wpa_hexdump(MSG_DEBUG, "WNM: TFS Request element",
109 (u8 *) wnmtfs_ie, wnmtfs_ie_len);
110
111 oci_ie = NULL;
112 oci_ie_len = 0;
113 #ifdef CONFIG_OCV
114 if (action == WNM_SLEEP_MODE_EXIT && wpa_sm_ocv_enabled(wpa_s->wpa)) {
115 struct wpa_channel_info ci;
116
117 if (wpa_drv_channel_info(wpa_s, &ci) != 0) {
118 wpa_printf(MSG_WARNING,
119 "Failed to get channel info for OCI element in WNM-Sleep Mode frame");
120 os_free(wnmsleep_ie);
121 os_free(wnmtfs_ie);
122 return -1;
123 }
124 #ifdef CONFIG_TESTING_OPTIONS
125 if (wpa_s->oci_freq_override_wnm_sleep) {
126 wpa_printf(MSG_INFO,
127 "TEST: Override OCI KDE frequency %d -> %d MHz",
128 ci.frequency,
129 wpa_s->oci_freq_override_wnm_sleep);
130 ci.frequency = wpa_s->oci_freq_override_wnm_sleep;
131 }
132 #endif /* CONFIG_TESTING_OPTIONS */
133
134 oci_ie_len = OCV_OCI_EXTENDED_LEN;
135 oci_ie = os_zalloc(oci_ie_len);
136 if (!oci_ie) {
137 wpa_printf(MSG_WARNING,
138 "Failed to allocate buffer for for OCI element in WNM-Sleep Mode frame");
139 os_free(wnmsleep_ie);
140 os_free(wnmtfs_ie);
141 return -1;
142 }
143
144 if (ocv_insert_extended_oci(&ci, oci_ie) < 0) {
145 os_free(wnmsleep_ie);
146 os_free(wnmtfs_ie);
147 os_free(oci_ie);
148 return -1;
149 }
150 }
151 #endif /* CONFIG_OCV */
152
153 mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len +
154 oci_ie_len);
155 if (mgmt == NULL) {
156 wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
157 "WNM-Sleep Request action frame");
158 os_free(wnmsleep_ie);
159 os_free(wnmtfs_ie);
160 return -1;
161 }
162
163 os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
164 os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
165 os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
166 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
167 WLAN_FC_STYPE_ACTION);
168 mgmt->u.action.category = WLAN_ACTION_WNM;
169 mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ;
170 mgmt->u.action.u.wnm_sleep_req.dialogtoken = 1;
171 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
172 wnmsleep_ie_len);
173 /* copy TFS IE here */
174 if (wnmtfs_ie_len > 0) {
175 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
176 wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
177 }
178
179 #ifdef CONFIG_OCV
180 /* copy OCV OCI here */
181 if (oci_ie_len > 0) {
182 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
183 wnmsleep_ie_len + wnmtfs_ie_len, oci_ie, oci_ie_len);
184 }
185 #endif /* CONFIG_OCV */
186
187 len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
188 wnmtfs_ie_len + oci_ie_len;
189
190 res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
191 wpa_s->own_addr, wpa_s->bssid,
192 &mgmt->u.action.category, len, 0);
193 if (res < 0)
194 wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
195 "(action=%d, intval=%d)", action, intval);
196 else
197 wpa_s->wnmsleep_used = 1;
198
199 os_free(wnmsleep_ie);
200 os_free(wnmtfs_ie);
201 os_free(oci_ie);
202 os_free(mgmt);
203
204 return res;
205 }
206
207
wnm_sleep_mode_enter_success(struct wpa_supplicant * wpa_s,const u8 * tfsresp_ie_start,const u8 * tfsresp_ie_end)208 static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s,
209 const u8 *tfsresp_ie_start,
210 const u8 *tfsresp_ie_end)
211 {
212 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
213 wpa_s->bssid, NULL, NULL);
214 /* remove GTK/IGTK ?? */
215
216 /* set the TFS Resp IE(s) */
217 if (tfsresp_ie_start && tfsresp_ie_end &&
218 tfsresp_ie_end - tfsresp_ie_start >= 0) {
219 u16 tfsresp_ie_len;
220 tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) -
221 tfsresp_ie_start;
222 wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
223 /* pass the TFS Resp IE(s) to driver for processing */
224 if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid,
225 tfsresp_ie_start,
226 tfsresp_ie_len,
227 WNM_SLEEP_TFS_RESP_IE_SET))
228 wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE");
229 }
230 }
231
232
wnm_sleep_mode_exit_success(struct wpa_supplicant * wpa_s,const u8 * frm,u16 key_len_total)233 static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
234 const u8 *frm, u16 key_len_total)
235 {
236 u8 *ptr, *end;
237 u8 gtk_len;
238
239 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM, wpa_s->bssid,
240 NULL, NULL);
241
242 /* Install GTK/IGTK */
243
244 /* point to key data field */
245 ptr = (u8 *) frm + 1 + 2;
246 end = ptr + key_len_total;
247 wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
248
249 if (key_len_total && !wpa_sm_pmf_enabled(wpa_s->wpa)) {
250 wpa_msg(wpa_s, MSG_INFO,
251 "WNM: Ignore Key Data in WNM-Sleep Mode Response - PMF not enabled");
252 return;
253 }
254
255 while (end - ptr > 1) {
256 if (2 + ptr[1] > end - ptr) {
257 wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
258 "length");
259 if (end > ptr) {
260 wpa_hexdump(MSG_DEBUG, "WNM: Remaining data",
261 ptr, end - ptr);
262 }
263 break;
264 }
265 if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
266 if (ptr[1] < 11 + 5) {
267 wpa_printf(MSG_DEBUG, "WNM: Too short GTK "
268 "subelem");
269 break;
270 }
271 gtk_len = *(ptr + 4);
272 if (ptr[1] < 11 + gtk_len ||
273 gtk_len < 5 || gtk_len > 32) {
274 wpa_printf(MSG_DEBUG, "WNM: Invalid GTK "
275 "subelem");
276 break;
277 }
278 wpa_wnmsleep_install_key(
279 wpa_s->wpa,
280 WNM_SLEEP_SUBELEM_GTK,
281 ptr);
282 ptr += 13 + gtk_len;
283 } else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) {
284 if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) {
285 wpa_printf(MSG_DEBUG, "WNM: Too short IGTK "
286 "subelem");
287 break;
288 }
289 wpa_wnmsleep_install_key(wpa_s->wpa,
290 WNM_SLEEP_SUBELEM_IGTK, ptr);
291 ptr += 10 + WPA_IGTK_LEN;
292 } else if (*ptr == WNM_SLEEP_SUBELEM_BIGTK) {
293 if (ptr[1] < 2 + 6 + WPA_BIGTK_LEN) {
294 wpa_printf(MSG_DEBUG,
295 "WNM: Too short BIGTK subelem");
296 break;
297 }
298 wpa_wnmsleep_install_key(wpa_s->wpa,
299 WNM_SLEEP_SUBELEM_BIGTK, ptr);
300 ptr += 10 + WPA_BIGTK_LEN;
301 } else
302 break; /* skip the loop */
303 }
304 }
305
306
ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant * wpa_s,const u8 * frm,int len)307 static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
308 const u8 *frm, int len)
309 {
310 /*
311 * Action [1] | Dialog Token [1] | Key Data Len [2] | Key Data |
312 * WNM-Sleep Mode IE | TFS Response IE
313 */
314 const u8 *pos = frm; /* point to payload after the action field */
315 u16 key_len_total;
316 struct wnm_sleep_element *wnmsleep_ie = NULL;
317 /* multiple TFS Resp IE (assuming consecutive) */
318 const u8 *tfsresp_ie_start = NULL;
319 const u8 *tfsresp_ie_end = NULL;
320 #ifdef CONFIG_OCV
321 const u8 *oci_ie = NULL;
322 u8 oci_ie_len = 0;
323 #endif /* CONFIG_OCV */
324 size_t left;
325
326 if (!wpa_s->wnmsleep_used) {
327 wpa_printf(MSG_DEBUG,
328 "WNM: Ignore WNM-Sleep Mode Response frame since WNM-Sleep Mode operation has not been requested");
329 return;
330 }
331
332 if (len < 3)
333 return;
334 key_len_total = WPA_GET_LE16(frm + 1);
335
336 wpa_printf(MSG_DEBUG, "WNM-Sleep Mode Response token=%u key_len_total=%d",
337 frm[0], key_len_total);
338 left = len - 3;
339 if (key_len_total > left) {
340 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
341 return;
342 }
343 pos += 3 + key_len_total;
344 while (pos - frm + 1 < len) {
345 u8 ie_len = *(pos + 1);
346 if (2 + ie_len > frm + len - pos) {
347 wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
348 break;
349 }
350 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
351 if (*pos == WLAN_EID_WNMSLEEP && ie_len >= 4)
352 wnmsleep_ie = (struct wnm_sleep_element *) pos;
353 else if (*pos == WLAN_EID_TFS_RESP) {
354 if (!tfsresp_ie_start)
355 tfsresp_ie_start = pos;
356 tfsresp_ie_end = pos;
357 #ifdef CONFIG_OCV
358 } else if (*pos == WLAN_EID_EXTENSION && ie_len >= 1 &&
359 pos[2] == WLAN_EID_EXT_OCV_OCI) {
360 oci_ie = pos + 3;
361 oci_ie_len = ie_len - 1;
362 #endif /* CONFIG_OCV */
363 } else
364 wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
365 pos += ie_len + 2;
366 }
367
368 if (!wnmsleep_ie) {
369 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
370 return;
371 }
372
373 #ifdef CONFIG_OCV
374 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT &&
375 wpa_sm_ocv_enabled(wpa_s->wpa)) {
376 struct wpa_channel_info ci;
377
378 if (wpa_drv_channel_info(wpa_s, &ci) != 0) {
379 wpa_msg(wpa_s, MSG_WARNING,
380 "Failed to get channel info to validate received OCI in WNM-Sleep Mode frame");
381 return;
382 }
383
384 if (ocv_verify_tx_params(oci_ie, oci_ie_len, &ci,
385 channel_width_to_int(ci.chanwidth),
386 ci.seg1_idx) != OCI_SUCCESS) {
387 wpa_msg(wpa_s, MSG_WARNING, "WNM: OCV failed: %s",
388 ocv_errorstr);
389 return;
390 }
391 }
392 #endif /* CONFIG_OCV */
393
394 wpa_s->wnmsleep_used = 0;
395
396 if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
397 wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
398 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
399 "frame (action=%d, intval=%d)",
400 wnmsleep_ie->action_type, wnmsleep_ie->intval);
401 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
402 wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
403 tfsresp_ie_end);
404 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
405 wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
406 }
407 } else {
408 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
409 "(action=%d, intval=%d)",
410 wnmsleep_ie->action_type, wnmsleep_ie->intval);
411 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
412 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
413 wpa_s->bssid, NULL, NULL);
414 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
415 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
416 wpa_s->bssid, NULL, NULL);
417 }
418 }
419
420
wnm_deallocate_memory(struct wpa_supplicant * wpa_s)421 void wnm_deallocate_memory(struct wpa_supplicant *wpa_s)
422 {
423 int i;
424
425 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
426 os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot);
427 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid);
428 }
429
430 wpa_s->wnm_num_neighbor_report = 0;
431 os_free(wpa_s->wnm_neighbor_report_elements);
432 wpa_s->wnm_neighbor_report_elements = NULL;
433
434 wpabuf_free(wpa_s->coloc_intf_elems);
435 wpa_s->coloc_intf_elems = NULL;
436 }
437
438
wnm_parse_neighbor_report_elem(struct neighbor_report * rep,u8 id,u8 elen,const u8 * pos)439 static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep,
440 u8 id, u8 elen, const u8 *pos)
441 {
442 switch (id) {
443 case WNM_NEIGHBOR_TSF:
444 if (elen < 2 + 2) {
445 wpa_printf(MSG_DEBUG, "WNM: Too short TSF");
446 break;
447 }
448 rep->tsf_offset = WPA_GET_LE16(pos);
449 rep->beacon_int = WPA_GET_LE16(pos + 2);
450 rep->tsf_present = 1;
451 break;
452 case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
453 if (elen < 2) {
454 wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
455 "country string");
456 break;
457 }
458 os_memcpy(rep->country, pos, 2);
459 rep->country_present = 1;
460 break;
461 case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
462 if (elen < 1) {
463 wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
464 "candidate");
465 break;
466 }
467 rep->preference = pos[0];
468 rep->preference_present = 1;
469 break;
470 case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
471 if (elen < 10) {
472 wpa_printf(MSG_DEBUG,
473 "WNM: Too short BSS termination duration");
474 break;
475 }
476 rep->bss_term_tsf = WPA_GET_LE64(pos);
477 rep->bss_term_dur = WPA_GET_LE16(pos + 8);
478 rep->bss_term_present = 1;
479 break;
480 case WNM_NEIGHBOR_BEARING:
481 if (elen < 8) {
482 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
483 "bearing");
484 break;
485 }
486 rep->bearing = WPA_GET_LE16(pos);
487 rep->distance = WPA_GET_LE32(pos + 2);
488 rep->rel_height = WPA_GET_LE16(pos + 2 + 4);
489 rep->bearing_present = 1;
490 break;
491 case WNM_NEIGHBOR_MEASUREMENT_PILOT:
492 if (elen < 1) {
493 wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
494 "pilot");
495 break;
496 }
497 os_free(rep->meas_pilot);
498 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
499 if (rep->meas_pilot == NULL)
500 break;
501 rep->meas_pilot->measurement_pilot = pos[0];
502 rep->meas_pilot->subelem_len = elen - 1;
503 os_memcpy(rep->meas_pilot->subelems, pos + 1, elen - 1);
504 break;
505 case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
506 if (elen < 5) {
507 wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
508 "capabilities");
509 break;
510 }
511 os_memcpy(rep->rm_capab, pos, 5);
512 rep->rm_capab_present = 1;
513 break;
514 case WNM_NEIGHBOR_MULTIPLE_BSSID:
515 if (elen < 1) {
516 wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
517 break;
518 }
519 os_free(rep->mul_bssid);
520 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
521 if (rep->mul_bssid == NULL)
522 break;
523 rep->mul_bssid->max_bssid_indicator = pos[0];
524 rep->mul_bssid->subelem_len = elen - 1;
525 os_memcpy(rep->mul_bssid->subelems, pos + 1, elen - 1);
526 break;
527 default:
528 wpa_printf(MSG_DEBUG,
529 "WNM: Unsupported neighbor report subelement id %u",
530 id);
531 break;
532 }
533 }
534
535
wnm_nei_get_chan(struct wpa_supplicant * wpa_s,u8 op_class,u8 chan)536 static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan)
537 {
538 struct wpa_bss *bss = wpa_s->current_bss;
539 const char *country = NULL;
540 int freq;
541
542 if (bss) {
543 const u8 *elem = wpa_bss_get_ie(bss, WLAN_EID_COUNTRY);
544
545 if (elem && elem[1] >= 2)
546 country = (const char *) (elem + 2);
547 }
548
549 freq = ieee80211_chan_to_freq(country, op_class, chan);
550 if (freq <= 0 && op_class == 0) {
551 /*
552 * Some APs do not advertise correct operating class
553 * information. Try to determine the most likely operating
554 * frequency based on the channel number.
555 */
556 if (chan >= 1 && chan <= 13)
557 freq = 2407 + chan * 5;
558 else if (chan == 14)
559 freq = 2484;
560 else if (chan >= 36 && chan <= 177)
561 freq = 5000 + chan * 5;
562 }
563 return freq;
564 }
565
566
wnm_parse_neighbor_report(struct wpa_supplicant * wpa_s,const u8 * pos,u8 len,struct neighbor_report * rep)567 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
568 const u8 *pos, u8 len,
569 struct neighbor_report *rep)
570 {
571 u8 left = len;
572
573 if (left < 13) {
574 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
575 return;
576 }
577
578 os_memcpy(rep->bssid, pos, ETH_ALEN);
579 rep->bssid_info = WPA_GET_LE32(pos + ETH_ALEN);
580 rep->regulatory_class = *(pos + 10);
581 rep->channel_number = *(pos + 11);
582 rep->phy_type = *(pos + 12);
583
584 pos += 13;
585 left -= 13;
586
587 while (left >= 2) {
588 u8 id, elen;
589
590 id = *pos++;
591 elen = *pos++;
592 wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen);
593 left -= 2;
594 if (elen > left) {
595 wpa_printf(MSG_DEBUG,
596 "WNM: Truncated neighbor report subelement");
597 break;
598 }
599 wnm_parse_neighbor_report_elem(rep, id, elen, pos);
600 left -= elen;
601 pos += elen;
602 }
603
604 rep->freq = wnm_nei_get_chan(wpa_s, rep->regulatory_class,
605 rep->channel_number);
606 }
607
608
wnm_clear_acceptable(struct wpa_supplicant * wpa_s)609 static void wnm_clear_acceptable(struct wpa_supplicant *wpa_s)
610 {
611 unsigned int i;
612
613 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++)
614 wpa_s->wnm_neighbor_report_elements[i].acceptable = 0;
615 }
616
617 #ifdef CONFIG_MBO
618 static struct wpa_bss *
get_mbo_transition_candidate(struct wpa_supplicant * wpa_s,enum mbo_transition_reject_reason * reason)619 get_mbo_transition_candidate(struct wpa_supplicant *wpa_s,
620 enum mbo_transition_reject_reason *reason)
621 {
622 struct wpa_bss *target = NULL;
623 struct wpa_bss_trans_info params;
624 struct wpa_bss_candidate_info *info = NULL;
625 struct neighbor_report *nei = wpa_s->wnm_neighbor_report_elements;
626 u8 *first_candidate_bssid = NULL, *pos;
627 unsigned int i;
628
629 params.mbo_transition_reason = wpa_s->wnm_mbo_transition_reason;
630 params.n_candidates = 0;
631 params.bssid = os_calloc(wpa_s->wnm_num_neighbor_report, ETH_ALEN);
632 if (!params.bssid)
633 return NULL;
634
635 pos = params.bssid;
636 for (i = 0; i < wpa_s->wnm_num_neighbor_report; nei++, i++) {
637 if (nei->is_first)
638 first_candidate_bssid = nei->bssid;
639 if (!nei->acceptable)
640 continue;
641 os_memcpy(pos, nei->bssid, ETH_ALEN);
642 pos += ETH_ALEN;
643 params.n_candidates++;
644 }
645
646 if (!params.n_candidates)
647 goto end;
648
649 info = wpa_drv_get_bss_trans_status(wpa_s, ¶ms);
650 if (!info) {
651 /* If failed to get candidate BSS transition status from driver,
652 * get the first acceptable candidate from wpa_supplicant.
653 */
654 target = wpa_bss_get_bssid(wpa_s, params.bssid);
655 goto end;
656 }
657
658 /* Get the first acceptable candidate from driver */
659 for (i = 0; i < info->num; i++) {
660 if (info->candidates[i].is_accept) {
661 target = wpa_bss_get_bssid(wpa_s,
662 info->candidates[i].bssid);
663 goto end;
664 }
665 }
666
667 /* If Disassociation Imminent is set and driver rejects all the
668 * candidate select first acceptable candidate which has
669 * rssi > disassoc_imminent_rssi_threshold
670 */
671 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
672 for (i = 0; i < info->num; i++) {
673 target = wpa_bss_get_bssid(wpa_s,
674 info->candidates[i].bssid);
675 if (target &&
676 (target->level <
677 wpa_s->conf->disassoc_imminent_rssi_threshold))
678 continue;
679 goto end;
680 }
681 }
682
683 /* While sending BTM reject use reason code of the first candidate
684 * received in BTM request frame
685 */
686 if (reason) {
687 for (i = 0; i < info->num; i++) {
688 if (first_candidate_bssid &&
689 os_memcmp(first_candidate_bssid,
690 info->candidates[i].bssid, ETH_ALEN) == 0)
691 {
692 *reason = info->candidates[i].reject_reason;
693 break;
694 }
695 }
696 }
697
698 target = NULL;
699
700 end:
701 os_free(params.bssid);
702 if (info) {
703 os_free(info->candidates);
704 os_free(info);
705 }
706 return target;
707 }
708 #endif /* CONFIG_MBO */
709
710
find_better_target(struct wpa_bss * a,struct wpa_bss * b)711 static struct wpa_bss * find_better_target(struct wpa_bss *a,
712 struct wpa_bss *b)
713 {
714 if (!a)
715 return b;
716 if (!b)
717 return a;
718
719 if (a->est_throughput > b->est_throughput) {
720 wpa_printf(MSG_DEBUG, "WNM: A is better: " MACSTR
721 " est-tput: %d B: " MACSTR " est-tput: %d",
722 MAC2STR(a->bssid), a->est_throughput,
723 MAC2STR(b->bssid), b->est_throughput);
724 return a;
725 }
726
727 wpa_printf(MSG_DEBUG, "WNM: B is better, A: " MACSTR
728 " est-tput: %d B: " MACSTR " est-tput: %d",
729 MAC2STR(a->bssid), a->est_throughput,
730 MAC2STR(b->bssid), b->est_throughput);
731 return b;
732 }
733
734 static struct wpa_bss *
compare_scan_neighbor_results(struct wpa_supplicant * wpa_s,os_time_t age_secs,enum mbo_transition_reject_reason * reason)735 compare_scan_neighbor_results(struct wpa_supplicant *wpa_s, os_time_t age_secs,
736 enum mbo_transition_reject_reason *reason)
737 {
738 u8 i;
739 struct wpa_bss *bss = wpa_s->current_bss;
740 struct wpa_bss *target;
741 struct wpa_bss *best_target = NULL;
742 struct wpa_bss *bss_in_list = NULL;
743
744 if (!bss)
745 return NULL;
746
747 wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
748 MAC2STR(wpa_s->bssid), bss->level);
749
750 wnm_clear_acceptable(wpa_s);
751
752 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
753 struct neighbor_report *nei;
754
755 nei = &wpa_s->wnm_neighbor_report_elements[i];
756 if (nei->preference_present && nei->preference == 0) {
757 wpa_printf(MSG_DEBUG, "Skip excluded BSS " MACSTR,
758 MAC2STR(nei->bssid));
759 continue;
760 }
761
762 target = wpa_bss_get_bssid(wpa_s, nei->bssid);
763 if (!target) {
764 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
765 " (pref %d) not found in scan results",
766 MAC2STR(nei->bssid),
767 nei->preference_present ? nei->preference :
768 -1);
769 continue;
770 }
771
772 if (age_secs) {
773 struct os_reltime now;
774
775 if (os_get_reltime(&now) == 0 &&
776 os_reltime_expired(&now, &target->last_update,
777 age_secs)) {
778 wpa_printf(MSG_DEBUG,
779 "Candidate BSS is more than %ld seconds old",
780 age_secs);
781 continue;
782 }
783 }
784
785 if (bss->ssid_len != target->ssid_len ||
786 os_memcmp(bss->ssid, target->ssid, bss->ssid_len) != 0) {
787 /*
788 * TODO: Could consider allowing transition to another
789 * ESS if PMF was enabled for the association.
790 */
791 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
792 " (pref %d) in different ESS",
793 MAC2STR(nei->bssid),
794 nei->preference_present ? nei->preference :
795 -1);
796 continue;
797 }
798
799 if (wpa_s->current_ssid &&
800 !wpa_scan_res_match(wpa_s, 0, target, wpa_s->current_ssid,
801 1, 0)) {
802 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
803 " (pref %d) does not match the current network profile",
804 MAC2STR(nei->bssid),
805 nei->preference_present ? nei->preference :
806 -1);
807 continue;
808 }
809
810 if (wpa_is_bss_tmp_disallowed(wpa_s, target)) {
811 wpa_printf(MSG_DEBUG,
812 "MBO: Candidate BSS " MACSTR
813 " retry delay is not over yet",
814 MAC2STR(nei->bssid));
815 continue;
816 }
817
818 if (target->level < bss->level && target->level < -80) {
819 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
820 " (pref %d) does not have sufficient signal level (%d)",
821 MAC2STR(nei->bssid),
822 nei->preference_present ? nei->preference :
823 -1,
824 target->level);
825 continue;
826 }
827
828 nei->acceptable = 1;
829
830 best_target = find_better_target(target, best_target);
831 if (target == bss)
832 bss_in_list = bss;
833 }
834
835 #ifdef CONFIG_MBO
836 if (wpa_s->wnm_mbo_trans_reason_present)
837 target = get_mbo_transition_candidate(wpa_s, reason);
838 else
839 target = best_target;
840 #else /* CONFIG_MBO */
841 target = best_target;
842 #endif /* CONFIG_MBO */
843
844 if (!target)
845 return NULL;
846
847 wpa_printf(MSG_DEBUG,
848 "WNM: Found an acceptable preferred transition candidate BSS "
849 MACSTR " (RSSI %d, tput: %d bss-tput: %d)",
850 MAC2STR(target->bssid), target->level,
851 target->est_throughput, bss->est_throughput);
852
853 if (!bss_in_list)
854 return target;
855
856 if ((!target->est_throughput && !bss_in_list->est_throughput) ||
857 (target->est_throughput > bss_in_list->est_throughput &&
858 target->est_throughput - bss_in_list->est_throughput >
859 bss_in_list->est_throughput >> 4)) {
860 /* It is more than 100/16 percent better, so switch. */
861 return target;
862 }
863
864 wpa_printf(MSG_DEBUG,
865 "WNM: Stay with our current BSS, not enough change in estimated throughput to switch");
866 return bss_in_list;
867 }
868
869
wpa_bss_ies_eq(struct wpa_bss * a,struct wpa_bss * b,u8 eid)870 static int wpa_bss_ies_eq(struct wpa_bss *a, struct wpa_bss *b, u8 eid)
871 {
872 const u8 *ie_a, *ie_b;
873
874 if (!a || !b)
875 return 0;
876
877 ie_a = wpa_bss_get_ie(a, eid);
878 ie_b = wpa_bss_get_ie(b, eid);
879
880 if (!ie_a || !ie_b || ie_a[1] != ie_b[1])
881 return 0;
882
883 return os_memcmp(ie_a, ie_b, ie_a[1]) == 0;
884 }
885
886
wnm_get_bss_info(struct wpa_supplicant * wpa_s,struct wpa_bss * bss)887 static u32 wnm_get_bss_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
888 {
889 u32 info = 0;
890
891 info |= NEI_REP_BSSID_INFO_AP_UNKNOWN_REACH;
892
893 /*
894 * Leave the security and key scope bits unset to indicate that the
895 * security information is not available.
896 */
897
898 if (bss->caps & WLAN_CAPABILITY_SPECTRUM_MGMT)
899 info |= NEI_REP_BSSID_INFO_SPECTRUM_MGMT;
900 if (bss->caps & WLAN_CAPABILITY_QOS)
901 info |= NEI_REP_BSSID_INFO_QOS;
902 if (bss->caps & WLAN_CAPABILITY_APSD)
903 info |= NEI_REP_BSSID_INFO_APSD;
904 if (bss->caps & WLAN_CAPABILITY_RADIO_MEASUREMENT)
905 info |= NEI_REP_BSSID_INFO_RM;
906 if (bss->caps & WLAN_CAPABILITY_DELAYED_BLOCK_ACK)
907 info |= NEI_REP_BSSID_INFO_DELAYED_BA;
908 if (bss->caps & WLAN_CAPABILITY_IMM_BLOCK_ACK)
909 info |= NEI_REP_BSSID_INFO_IMM_BA;
910 if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_MOBILITY_DOMAIN))
911 info |= NEI_REP_BSSID_INFO_MOBILITY_DOMAIN;
912 if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_HT_CAP))
913 info |= NEI_REP_BSSID_INFO_HT;
914
915 return info;
916 }
917
918
wnm_add_nei_rep(struct wpabuf ** buf,const u8 * bssid,u32 bss_info,u8 op_class,u8 chan,u8 phy_type,u8 pref)919 static int wnm_add_nei_rep(struct wpabuf **buf, const u8 *bssid,
920 u32 bss_info, u8 op_class, u8 chan, u8 phy_type,
921 u8 pref)
922 {
923 if (wpabuf_len(*buf) + 18 >
924 IEEE80211_MAX_MMPDU_SIZE - IEEE80211_HDRLEN) {
925 wpa_printf(MSG_DEBUG,
926 "WNM: No room in frame for Neighbor Report element");
927 return -1;
928 }
929
930 if (wpabuf_resize(buf, 18) < 0) {
931 wpa_printf(MSG_DEBUG,
932 "WNM: Failed to allocate memory for Neighbor Report element");
933 return -1;
934 }
935
936 wpabuf_put_u8(*buf, WLAN_EID_NEIGHBOR_REPORT);
937 /* length: 13 for basic neighbor report + 3 for preference subelement */
938 wpabuf_put_u8(*buf, 16);
939 wpabuf_put_data(*buf, bssid, ETH_ALEN);
940 wpabuf_put_le32(*buf, bss_info);
941 wpabuf_put_u8(*buf, op_class);
942 wpabuf_put_u8(*buf, chan);
943 wpabuf_put_u8(*buf, phy_type);
944 wpabuf_put_u8(*buf, WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE);
945 wpabuf_put_u8(*buf, 1);
946 wpabuf_put_u8(*buf, pref);
947 return 0;
948 }
949
950
wnm_nei_rep_add_bss(struct wpa_supplicant * wpa_s,struct wpa_bss * bss,struct wpabuf ** buf,u8 pref)951 static int wnm_nei_rep_add_bss(struct wpa_supplicant *wpa_s,
952 struct wpa_bss *bss, struct wpabuf **buf,
953 u8 pref)
954 {
955 const u8 *ie;
956 u8 op_class, chan;
957 int sec_chan = 0;
958 enum oper_chan_width vht = CONF_OPER_CHWIDTH_USE_HT;
959 enum phy_type phy_type;
960 u32 info;
961 struct ieee80211_ht_operation *ht_oper = NULL;
962 struct ieee80211_vht_operation *vht_oper = NULL;
963
964 ie = wpa_bss_get_ie(bss, WLAN_EID_HT_OPERATION);
965 if (ie && ie[1] >= 2) {
966 ht_oper = (struct ieee80211_ht_operation *) (ie + 2);
967
968 if (ht_oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
969 sec_chan = 1;
970 else if (ht_oper->ht_param &
971 HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
972 sec_chan = -1;
973 }
974
975 ie = wpa_bss_get_ie(bss, WLAN_EID_VHT_OPERATION);
976 if (ie && ie[1] >= 1) {
977 vht_oper = (struct ieee80211_vht_operation *) (ie + 2);
978
979 if (vht_oper->vht_op_info_chwidth == CHANWIDTH_80MHZ ||
980 vht_oper->vht_op_info_chwidth == CHANWIDTH_160MHZ ||
981 vht_oper->vht_op_info_chwidth == CHANWIDTH_80P80MHZ)
982 vht = vht_oper->vht_op_info_chwidth;
983 }
984
985 if (ieee80211_freq_to_channel_ext(bss->freq, sec_chan, vht, &op_class,
986 &chan) == NUM_HOSTAPD_MODES) {
987 wpa_printf(MSG_DEBUG,
988 "WNM: Cannot determine operating class and channel");
989 return -2;
990 }
991
992 phy_type = ieee80211_get_phy_type(bss->freq, (ht_oper != NULL),
993 (vht_oper != NULL));
994 if (phy_type == PHY_TYPE_UNSPECIFIED) {
995 wpa_printf(MSG_DEBUG,
996 "WNM: Cannot determine BSS phy type for Neighbor Report");
997 return -2;
998 }
999
1000 info = wnm_get_bss_info(wpa_s, bss);
1001
1002 return wnm_add_nei_rep(buf, bss->bssid, info, op_class, chan, phy_type,
1003 pref);
1004 }
1005
1006
wnm_add_cand_list(struct wpa_supplicant * wpa_s,struct wpabuf ** buf)1007 static void wnm_add_cand_list(struct wpa_supplicant *wpa_s, struct wpabuf **buf)
1008 {
1009 unsigned int i, pref = 255;
1010 struct os_reltime now;
1011 struct wpa_ssid *ssid = wpa_s->current_ssid;
1012
1013 if (!ssid)
1014 return;
1015
1016 /*
1017 * TODO: Define when scan results are no longer valid for the candidate
1018 * list.
1019 */
1020 os_get_reltime(&now);
1021 if (os_reltime_expired(&now, &wpa_s->last_scan, 10))
1022 return;
1023
1024 wpa_printf(MSG_DEBUG,
1025 "WNM: Add candidate list to BSS Transition Management Response frame");
1026 for (i = 0; i < wpa_s->last_scan_res_used && pref; i++) {
1027 struct wpa_bss *bss = wpa_s->last_scan_res[i];
1028 int res;
1029
1030 if (wpa_scan_res_match(wpa_s, i, bss, ssid, 1, 0)) {
1031 res = wnm_nei_rep_add_bss(wpa_s, bss, buf, pref--);
1032 if (res == -2)
1033 continue; /* could not build entry for BSS */
1034 if (res < 0)
1035 break; /* no more room for candidates */
1036 if (pref == 1)
1037 break;
1038 }
1039 }
1040
1041 wpa_hexdump_buf(MSG_DEBUG,
1042 "WNM: BSS Transition Management Response candidate list",
1043 *buf);
1044 }
1045
1046
1047 #define BTM_RESP_MIN_SIZE 5 + ETH_ALEN
1048
wnm_send_bss_transition_mgmt_resp(struct wpa_supplicant * wpa_s,u8 dialog_token,enum bss_trans_mgmt_status_code status,enum mbo_transition_reject_reason reason,u8 delay,const u8 * target_bssid)1049 static void wnm_send_bss_transition_mgmt_resp(
1050 struct wpa_supplicant *wpa_s, u8 dialog_token,
1051 enum bss_trans_mgmt_status_code status,
1052 enum mbo_transition_reject_reason reason,
1053 u8 delay, const u8 *target_bssid)
1054 {
1055 struct wpabuf *buf;
1056 int res;
1057
1058 wpa_printf(MSG_DEBUG,
1059 "WNM: Send BSS Transition Management Response to " MACSTR
1060 " dialog_token=%u status=%u reason=%u delay=%d",
1061 MAC2STR(wpa_s->bssid), dialog_token, status, reason, delay);
1062 if (!wpa_s->current_bss) {
1063 wpa_printf(MSG_DEBUG,
1064 "WNM: Current BSS not known - drop response");
1065 return;
1066 }
1067
1068 buf = wpabuf_alloc(BTM_RESP_MIN_SIZE);
1069 if (!buf) {
1070 wpa_printf(MSG_DEBUG,
1071 "WNM: Failed to allocate memory for BTM response");
1072 return;
1073 }
1074
1075 wpa_s->bss_tm_status = status;
1076 wpas_notify_bss_tm_status(wpa_s);
1077
1078 wpabuf_put_u8(buf, WLAN_ACTION_WNM);
1079 wpabuf_put_u8(buf, WNM_BSS_TRANS_MGMT_RESP);
1080 wpabuf_put_u8(buf, dialog_token);
1081 wpabuf_put_u8(buf, status);
1082 wpabuf_put_u8(buf, delay);
1083 if (target_bssid) {
1084 wpabuf_put_data(buf, target_bssid, ETH_ALEN);
1085 } else if (status == WNM_BSS_TM_ACCEPT) {
1086 /*
1087 * P802.11-REVmc clarifies that the Target BSSID field is always
1088 * present when status code is zero, so use a fake value here if
1089 * no BSSID is yet known.
1090 */
1091 wpabuf_put_data(buf, "\0\0\0\0\0\0", ETH_ALEN);
1092 }
1093
1094 if (status == WNM_BSS_TM_ACCEPT)
1095 wnm_add_cand_list(wpa_s, &buf);
1096
1097 #ifdef CONFIG_MBO
1098 if (status != WNM_BSS_TM_ACCEPT &&
1099 wpa_bss_get_vendor_ie(wpa_s->current_bss, MBO_IE_VENDOR_TYPE)) {
1100 u8 mbo[10];
1101 size_t ret;
1102
1103 ret = wpas_mbo_ie_bss_trans_reject(wpa_s, mbo, sizeof(mbo),
1104 reason);
1105 if (ret) {
1106 if (wpabuf_resize(&buf, ret) < 0) {
1107 wpabuf_free(buf);
1108 wpa_printf(MSG_DEBUG,
1109 "WNM: Failed to allocate memory for MBO IE");
1110 return;
1111 }
1112
1113 wpabuf_put_data(buf, mbo, ret);
1114 }
1115 }
1116 #endif /* CONFIG_MBO */
1117
1118 res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
1119 wpa_s->own_addr, wpa_s->bssid,
1120 wpabuf_head_u8(buf), wpabuf_len(buf), 0);
1121 if (res < 0) {
1122 wpa_printf(MSG_DEBUG,
1123 "WNM: Failed to send BSS Transition Management Response");
1124 }
1125
1126 wpabuf_free(buf);
1127 }
1128
1129
wnm_bss_tm_connect(struct wpa_supplicant * wpa_s,struct wpa_bss * bss,struct wpa_ssid * ssid,int after_new_scan)1130 static void wnm_bss_tm_connect(struct wpa_supplicant *wpa_s,
1131 struct wpa_bss *bss, struct wpa_ssid *ssid,
1132 int after_new_scan)
1133 {
1134 struct wpa_radio_work *already_connecting;
1135
1136 wpa_dbg(wpa_s, MSG_DEBUG,
1137 "WNM: Transition to BSS " MACSTR
1138 " based on BSS Transition Management Request (old BSSID "
1139 MACSTR " after_new_scan=%d)",
1140 MAC2STR(bss->bssid), MAC2STR(wpa_s->bssid), after_new_scan);
1141
1142 /* Send the BSS Management Response - Accept */
1143 if (wpa_s->wnm_reply) {
1144 wpa_s->wnm_reply = 0;
1145 wpa_printf(MSG_DEBUG,
1146 "WNM: Sending successful BSS Transition Management Response");
1147 wnm_send_bss_transition_mgmt_resp(
1148 wpa_s, wpa_s->wnm_dialog_token, WNM_BSS_TM_ACCEPT,
1149 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
1150 bss->bssid);
1151 }
1152
1153 if (bss == wpa_s->current_bss) {
1154 wpa_printf(MSG_DEBUG,
1155 "WNM: Already associated with the preferred candidate");
1156 wnm_deallocate_memory(wpa_s);
1157 return;
1158 }
1159
1160 already_connecting = radio_work_pending(wpa_s, "sme-connect");
1161 wpa_s->reassociate = 1;
1162 wpa_printf(MSG_DEBUG, "WNM: Issuing connect");
1163 wpa_supplicant_connect(wpa_s, bss, ssid);
1164
1165 /*
1166 * Indicate that a BSS transition is in progress so scan results that
1167 * come in before the 'sme-connect' radio work gets executed do not
1168 * override the original connection attempt.
1169 */
1170 if (!already_connecting && radio_work_pending(wpa_s, "sme-connect"))
1171 wpa_s->bss_trans_mgmt_in_progress = true;
1172 wnm_deallocate_memory(wpa_s);
1173 }
1174
1175
wnm_scan_process(struct wpa_supplicant * wpa_s,int reply_on_fail)1176 int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail)
1177 {
1178 struct wpa_bss *bss;
1179 struct wpa_ssid *ssid = wpa_s->current_ssid;
1180 enum bss_trans_mgmt_status_code status = WNM_BSS_TM_REJECT_UNSPECIFIED;
1181 enum mbo_transition_reject_reason reason =
1182 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED;
1183
1184 if (!wpa_s->wnm_neighbor_report_elements)
1185 return 0;
1186
1187 wpa_dbg(wpa_s, MSG_DEBUG,
1188 "WNM: Process scan results for BSS Transition Management");
1189 if (os_reltime_before(&wpa_s->wnm_cand_valid_until,
1190 &wpa_s->scan_trigger_time)) {
1191 wpa_printf(MSG_DEBUG, "WNM: Previously stored BSS transition candidate list is not valid anymore - drop it");
1192 wnm_deallocate_memory(wpa_s);
1193 return 0;
1194 }
1195
1196 if (!wpa_s->current_bss ||
1197 os_memcmp(wpa_s->wnm_cand_from_bss, wpa_s->current_bss->bssid,
1198 ETH_ALEN) != 0) {
1199 wpa_printf(MSG_DEBUG, "WNM: Stored BSS transition candidate list not from the current BSS - ignore it");
1200 return 0;
1201 }
1202
1203 /* Compare the Neighbor Report and scan results */
1204 bss = compare_scan_neighbor_results(wpa_s, 0, &reason);
1205 if (!bss) {
1206 wpa_printf(MSG_DEBUG, "WNM: No BSS transition candidate match found");
1207 status = WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES;
1208 goto send_bss_resp_fail;
1209 }
1210
1211 /* Associate to the network */
1212 wnm_bss_tm_connect(wpa_s, bss, ssid, 1);
1213 return 1;
1214
1215 send_bss_resp_fail:
1216 if (!reply_on_fail)
1217 return 0;
1218
1219 /* Send reject response for all the failures */
1220
1221 if (wpa_s->wnm_reply) {
1222 wpa_s->wnm_reply = 0;
1223 wnm_send_bss_transition_mgmt_resp(wpa_s,
1224 wpa_s->wnm_dialog_token,
1225 status, reason, 0, NULL);
1226 }
1227 wnm_deallocate_memory(wpa_s);
1228
1229 return 0;
1230 }
1231
1232
cand_pref_compar(const void * a,const void * b)1233 static int cand_pref_compar(const void *a, const void *b)
1234 {
1235 const struct neighbor_report *aa = a;
1236 const struct neighbor_report *bb = b;
1237
1238 if (aa->disassoc_imminent && !bb->disassoc_imminent)
1239 return 1;
1240 if (bb->disassoc_imminent && !aa->disassoc_imminent)
1241 return -1;
1242
1243 if (!aa->preference_present && !bb->preference_present)
1244 return 0;
1245 if (!aa->preference_present)
1246 return 1;
1247 if (!bb->preference_present)
1248 return -1;
1249 if (bb->preference > aa->preference)
1250 return 1;
1251 if (bb->preference < aa->preference)
1252 return -1;
1253 return 0;
1254 }
1255
1256
wnm_sort_cand_list(struct wpa_supplicant * wpa_s)1257 static void wnm_sort_cand_list(struct wpa_supplicant *wpa_s)
1258 {
1259 if (!wpa_s->wnm_neighbor_report_elements)
1260 return;
1261 qsort(wpa_s->wnm_neighbor_report_elements,
1262 wpa_s->wnm_num_neighbor_report, sizeof(struct neighbor_report),
1263 cand_pref_compar);
1264 }
1265
1266
wnm_dump_cand_list(struct wpa_supplicant * wpa_s)1267 static void wnm_dump_cand_list(struct wpa_supplicant *wpa_s)
1268 {
1269 unsigned int i;
1270
1271 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Candidate List");
1272 if (!wpa_s->wnm_neighbor_report_elements)
1273 return;
1274 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
1275 struct neighbor_report *nei;
1276
1277 nei = &wpa_s->wnm_neighbor_report_elements[i];
1278 wpa_printf(MSG_DEBUG, "%u: " MACSTR
1279 " info=0x%x op_class=%u chan=%u phy=%u pref=%d freq=%d",
1280 i, MAC2STR(nei->bssid), nei->bssid_info,
1281 nei->regulatory_class,
1282 nei->channel_number, nei->phy_type,
1283 nei->preference_present ? nei->preference : -1,
1284 nei->freq);
1285 }
1286 }
1287
1288
chan_supported(struct wpa_supplicant * wpa_s,int freq)1289 static int chan_supported(struct wpa_supplicant *wpa_s, int freq)
1290 {
1291 unsigned int i;
1292
1293 for (i = 0; i < wpa_s->hw.num_modes; i++) {
1294 struct hostapd_hw_modes *mode = &wpa_s->hw.modes[i];
1295 int j;
1296
1297 for (j = 0; j < mode->num_channels; j++) {
1298 struct hostapd_channel_data *chan;
1299
1300 chan = &mode->channels[j];
1301 if (chan->freq == freq &&
1302 !(chan->flag & HOSTAPD_CHAN_DISABLED))
1303 return 1;
1304 }
1305 }
1306
1307 return 0;
1308 }
1309
1310
wnm_set_scan_freqs(struct wpa_supplicant * wpa_s)1311 static void wnm_set_scan_freqs(struct wpa_supplicant *wpa_s)
1312 {
1313 int *freqs;
1314 int num_freqs = 0;
1315 unsigned int i;
1316
1317 if (!wpa_s->wnm_neighbor_report_elements)
1318 return;
1319
1320 if (wpa_s->hw.modes == NULL)
1321 return;
1322
1323 os_free(wpa_s->next_scan_freqs);
1324 wpa_s->next_scan_freqs = NULL;
1325
1326 freqs = os_calloc(wpa_s->wnm_num_neighbor_report + 1, sizeof(int));
1327 if (freqs == NULL)
1328 return;
1329
1330 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
1331 struct neighbor_report *nei;
1332
1333 nei = &wpa_s->wnm_neighbor_report_elements[i];
1334 if (nei->freq <= 0) {
1335 wpa_printf(MSG_DEBUG,
1336 "WNM: Unknown neighbor operating frequency for "
1337 MACSTR " - scan all channels",
1338 MAC2STR(nei->bssid));
1339 os_free(freqs);
1340 return;
1341 }
1342 if (chan_supported(wpa_s, nei->freq))
1343 add_freq(freqs, &num_freqs, nei->freq);
1344 }
1345
1346 if (num_freqs == 0) {
1347 os_free(freqs);
1348 return;
1349 }
1350
1351 wpa_printf(MSG_DEBUG,
1352 "WNM: Scan %d frequencies based on transition candidate list",
1353 num_freqs);
1354 wpa_s->next_scan_freqs = freqs;
1355 }
1356
1357
wnm_fetch_scan_results(struct wpa_supplicant * wpa_s)1358 static int wnm_fetch_scan_results(struct wpa_supplicant *wpa_s)
1359 {
1360 struct wpa_scan_results *scan_res;
1361 struct wpa_bss *bss;
1362 struct wpa_ssid *ssid = wpa_s->current_ssid;
1363 u8 i, found = 0;
1364 size_t j;
1365
1366 wpa_dbg(wpa_s, MSG_DEBUG,
1367 "WNM: Fetch current scan results from the driver for checking transition candidates");
1368 scan_res = wpa_drv_get_scan_results2(wpa_s);
1369 if (!scan_res) {
1370 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Failed to get scan results");
1371 return 0;
1372 }
1373
1374 if (scan_res->fetch_time.sec == 0)
1375 os_get_reltime(&scan_res->fetch_time);
1376
1377 filter_scan_res(wpa_s, scan_res);
1378
1379 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
1380 struct neighbor_report *nei;
1381
1382 nei = &wpa_s->wnm_neighbor_report_elements[i];
1383 if (nei->preference_present && nei->preference == 0)
1384 continue;
1385
1386 for (j = 0; j < scan_res->num; j++) {
1387 struct wpa_scan_res *res;
1388 const u8 *ssid_ie;
1389
1390 res = scan_res->res[j];
1391 if (os_memcmp(nei->bssid, res->bssid, ETH_ALEN) != 0 ||
1392 res->age > WNM_SCAN_RESULT_AGE * 1000)
1393 continue;
1394 bss = wpa_s->current_bss;
1395 ssid_ie = wpa_scan_get_ie(res, WLAN_EID_SSID);
1396 if (bss && ssid_ie && ssid_ie[1] &&
1397 (bss->ssid_len != ssid_ie[1] ||
1398 os_memcmp(bss->ssid, ssid_ie + 2,
1399 bss->ssid_len) != 0))
1400 continue; /* Skip entries for other ESSs */
1401
1402 /* Potential candidate found */
1403 found = 1;
1404 scan_snr(res);
1405 scan_est_throughput(wpa_s, res);
1406 wpa_bss_update_scan_res(wpa_s, res,
1407 &scan_res->fetch_time);
1408 }
1409 }
1410
1411 wpa_scan_results_free(scan_res);
1412 if (!found) {
1413 wpa_dbg(wpa_s, MSG_DEBUG,
1414 "WNM: No transition candidate matches existing scan results");
1415 return 0;
1416 }
1417
1418 bss = compare_scan_neighbor_results(wpa_s, WNM_SCAN_RESULT_AGE, NULL);
1419 if (!bss) {
1420 wpa_dbg(wpa_s, MSG_DEBUG,
1421 "WNM: Comparison of scan results against transition candidates did not find matches");
1422 return 0;
1423 }
1424
1425 /* Associate to the network */
1426 wnm_bss_tm_connect(wpa_s, bss, ssid, 0);
1427 return 1;
1428 }
1429
1430
ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant * wpa_s,const u8 * pos,const u8 * end,int reply)1431 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
1432 const u8 *pos, const u8 *end,
1433 int reply)
1434 {
1435 unsigned int beacon_int;
1436 u8 valid_int;
1437 #ifdef CONFIG_MBO
1438 const u8 *vendor;
1439 #endif /* CONFIG_MBO */
1440
1441 if (wpa_s->disable_mbo_oce || wpa_s->conf->disable_btm)
1442 return;
1443
1444 if (end - pos < 5)
1445 return;
1446
1447 #ifdef CONFIG_MBO
1448 wpa_s->wnm_mbo_trans_reason_present = 0;
1449 wpa_s->wnm_mbo_transition_reason = 0;
1450 wpa_s->wnm_mbo_cell_pref_present = 0;
1451 wpa_s->wnm_mbo_cell_preference = 0;
1452 wpa_s->wnm_mbo_assoc_retry_delay_present = 0;
1453 wpa_s->wnm_mbo_assoc_retry_delay_sec = 0;
1454 #endif /* CONFIG_MBO */
1455
1456 if (wpa_s->current_bss)
1457 beacon_int = wpa_s->current_bss->beacon_int;
1458 else
1459 beacon_int = 100; /* best guess */
1460
1461 wpa_s->wnm_dialog_token = pos[0];
1462 wpa_s->wnm_mode = pos[1];
1463 wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
1464 valid_int = pos[4];
1465 wpa_s->wnm_reply = reply;
1466
1467 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
1468 "dialog_token=%u request_mode=0x%x "
1469 "disassoc_timer=%u validity_interval=%u",
1470 wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
1471 wpa_s->wnm_dissoc_timer, valid_int);
1472
1473 #if defined(CONFIG_MBO) && defined(CONFIG_TESTING_OPTIONS)
1474 if (wpa_s->reject_btm_req_reason) {
1475 wpa_printf(MSG_INFO,
1476 "WNM: Testing - reject BSS Transition Management Request: reject_btm_req_reason=%d",
1477 wpa_s->reject_btm_req_reason);
1478 wnm_send_bss_transition_mgmt_resp(
1479 wpa_s, wpa_s->wnm_dialog_token,
1480 wpa_s->reject_btm_req_reason,
1481 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0, NULL);
1482 return;
1483 }
1484 #endif /* CONFIG_MBO && CONFIG_TESTING_OPTIONS */
1485
1486 pos += 5;
1487
1488 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
1489 if (end - pos < 12) {
1490 wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
1491 return;
1492 }
1493 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
1494 pos += 12; /* BSS Termination Duration */
1495 }
1496
1497 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
1498 char url[256];
1499 u8 url_len;
1500
1501 if (end - pos < 1) {
1502 wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
1503 "Management Request (URL)");
1504 return;
1505 }
1506 url_len = *pos++;
1507 if (url_len > end - pos) {
1508 wpa_printf(MSG_DEBUG,
1509 "WNM: Invalid BSS Transition Management Request (URL truncated)");
1510 return;
1511 }
1512 os_memcpy(url, pos, url_len);
1513 url[url_len] = '\0';
1514 pos += url_len;
1515
1516 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
1517 wpa_sm_pmf_enabled(wpa_s->wpa),
1518 wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
1519 }
1520
1521 #ifdef CONFIG_MBO
1522 vendor = get_ie(pos, end - pos, WLAN_EID_VENDOR_SPECIFIC);
1523 if (vendor) {
1524 wpas_mbo_ie_trans_req(wpa_s, vendor + 2, vendor[1]);
1525 }
1526 #endif /* CONFIG_MBO */
1527 if (wpa_s->conf->btm_offload) {
1528 wpa_printf(MSG_INFO,
1529 "WNM: BTM offload enabled. Notify status and return");
1530 wpa_s->bss_tm_status = WNM_BSS_TM_ACCEPT;
1531 wpas_notify_bss_tm_status(wpa_s);
1532 return;
1533 }
1534
1535 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
1536 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
1537 "Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
1538 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning &&
1539 (!wpa_s->current_ssid || !wpa_s->current_ssid->bssid_set)) {
1540 wpa_printf(MSG_DEBUG, "Trying to find another BSS");
1541 wpa_supplicant_req_scan(wpa_s, 0, 0);
1542 }
1543 }
1544
1545 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
1546 unsigned int valid_ms;
1547
1548 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
1549 wnm_deallocate_memory(wpa_s);
1550 wpa_s->wnm_neighbor_report_elements = os_calloc(
1551 WNM_MAX_NEIGHBOR_REPORT,
1552 sizeof(struct neighbor_report));
1553 if (wpa_s->wnm_neighbor_report_elements == NULL)
1554 return;
1555
1556 while (end - pos >= 2 &&
1557 wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
1558 {
1559 u8 tag = *pos++;
1560 u8 len = *pos++;
1561
1562 wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
1563 tag);
1564 if (len > end - pos) {
1565 wpa_printf(MSG_DEBUG, "WNM: Truncated request");
1566 return;
1567 }
1568 if (tag == WLAN_EID_NEIGHBOR_REPORT) {
1569 struct neighbor_report *rep;
1570 rep = &wpa_s->wnm_neighbor_report_elements[
1571 wpa_s->wnm_num_neighbor_report];
1572 wnm_parse_neighbor_report(wpa_s, pos, len, rep);
1573 if ((wpa_s->wnm_mode &
1574 WNM_BSS_TM_REQ_DISASSOC_IMMINENT) &&
1575 os_memcmp(rep->bssid, wpa_s->bssid,
1576 ETH_ALEN) == 0)
1577 rep->disassoc_imminent = 1;
1578
1579 wpa_s->wnm_num_neighbor_report++;
1580 #ifdef CONFIG_MBO
1581 if (wpa_s->wnm_mbo_trans_reason_present &&
1582 wpa_s->wnm_num_neighbor_report == 1) {
1583 rep->is_first = 1;
1584 wpa_printf(MSG_DEBUG,
1585 "WNM: First transition candidate is "
1586 MACSTR, MAC2STR(rep->bssid));
1587 }
1588 #endif /* CONFIG_MBO */
1589 }
1590
1591 pos += len;
1592 }
1593
1594 if (!wpa_s->wnm_num_neighbor_report) {
1595 wpa_printf(MSG_DEBUG,
1596 "WNM: Candidate list included bit is set, but no candidates found");
1597 wnm_send_bss_transition_mgmt_resp(
1598 wpa_s, wpa_s->wnm_dialog_token,
1599 WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES,
1600 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
1601 NULL);
1602 return;
1603 }
1604
1605 if (wpa_s->current_ssid && wpa_s->current_ssid->bssid_set) {
1606 wpa_printf(MSG_DEBUG,
1607 "WNM: Configuration prevents roaming (BSSID set)");
1608 wnm_send_bss_transition_mgmt_resp(
1609 wpa_s, wpa_s->wnm_dialog_token,
1610 WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES,
1611 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
1612 NULL);
1613 return;
1614 }
1615
1616 wnm_sort_cand_list(wpa_s);
1617 wnm_dump_cand_list(wpa_s);
1618 valid_ms = valid_int * beacon_int * 128 / 125;
1619 wpa_printf(MSG_DEBUG, "WNM: Candidate list valid for %u ms",
1620 valid_ms);
1621 os_get_reltime(&wpa_s->wnm_cand_valid_until);
1622 wpa_s->wnm_cand_valid_until.sec += valid_ms / 1000;
1623 wpa_s->wnm_cand_valid_until.usec += (valid_ms % 1000) * 1000;
1624 wpa_s->wnm_cand_valid_until.sec +=
1625 wpa_s->wnm_cand_valid_until.usec / 1000000;
1626 wpa_s->wnm_cand_valid_until.usec %= 1000000;
1627 os_memcpy(wpa_s->wnm_cand_from_bss, wpa_s->bssid, ETH_ALEN);
1628
1629 /*
1630 * Fetch the latest scan results from the kernel and check for
1631 * candidates based on those results first. This can help in
1632 * finding more up-to-date information should the driver has
1633 * done some internal scanning operations after the last scan
1634 * result update in wpa_supplicant.
1635 */
1636 if (wnm_fetch_scan_results(wpa_s) > 0)
1637 return;
1638
1639 /*
1640 * Try to use previously received scan results, if they are
1641 * recent enough to use for a connection.
1642 */
1643 if (wpa_s->last_scan_res_used > 0) {
1644 struct os_reltime now;
1645
1646 os_get_reltime(&now);
1647 if (!os_reltime_expired(&now, &wpa_s->last_scan, 10)) {
1648 wpa_printf(MSG_DEBUG,
1649 "WNM: Try to use recent scan results");
1650 if (wnm_scan_process(wpa_s, 0) > 0)
1651 return;
1652 wpa_printf(MSG_DEBUG,
1653 "WNM: No match in previous scan results - try a new scan");
1654 }
1655 }
1656
1657 wnm_set_scan_freqs(wpa_s);
1658 if (wpa_s->wnm_num_neighbor_report == 1) {
1659 os_memcpy(wpa_s->next_scan_bssid,
1660 wpa_s->wnm_neighbor_report_elements[0].bssid,
1661 ETH_ALEN);
1662 wpa_printf(MSG_DEBUG,
1663 "WNM: Scan only for a specific BSSID since there is only a single candidate "
1664 MACSTR, MAC2STR(wpa_s->next_scan_bssid));
1665 }
1666 wpa_supplicant_req_scan(wpa_s, 0, 0);
1667 } else if (reply) {
1668 enum bss_trans_mgmt_status_code status;
1669 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT)
1670 status = WNM_BSS_TM_ACCEPT;
1671 else {
1672 wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates");
1673 status = WNM_BSS_TM_REJECT_UNSPECIFIED;
1674 }
1675 wnm_send_bss_transition_mgmt_resp(
1676 wpa_s, wpa_s->wnm_dialog_token, status,
1677 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0, NULL);
1678 }
1679 }
1680
1681
1682 #define BTM_QUERY_MIN_SIZE 4
1683
wnm_send_bss_transition_mgmt_query(struct wpa_supplicant * wpa_s,u8 query_reason,const char * btm_candidates,int cand_list)1684 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
1685 u8 query_reason,
1686 const char *btm_candidates,
1687 int cand_list)
1688 {
1689 struct wpabuf *buf;
1690 int ret;
1691
1692 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
1693 MACSTR " query_reason=%u%s",
1694 MAC2STR(wpa_s->bssid), query_reason,
1695 cand_list ? " candidate list" : "");
1696
1697 buf = wpabuf_alloc(BTM_QUERY_MIN_SIZE);
1698 if (!buf)
1699 return -1;
1700
1701 wpabuf_put_u8(buf, WLAN_ACTION_WNM);
1702 wpabuf_put_u8(buf, WNM_BSS_TRANS_MGMT_QUERY);
1703 wpabuf_put_u8(buf, 1);
1704 wpabuf_put_u8(buf, query_reason);
1705
1706 if (cand_list)
1707 wnm_add_cand_list(wpa_s, &buf);
1708
1709 if (btm_candidates) {
1710 const size_t max_len = 1000;
1711
1712 ret = wpabuf_resize(&buf, max_len);
1713 if (ret < 0) {
1714 wpabuf_free(buf);
1715 return ret;
1716 }
1717
1718 ret = ieee802_11_parse_candidate_list(btm_candidates,
1719 wpabuf_put(buf, 0),
1720 max_len);
1721 if (ret < 0) {
1722 wpabuf_free(buf);
1723 return ret;
1724 }
1725
1726 wpabuf_put(buf, ret);
1727 }
1728
1729 ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
1730 wpa_s->own_addr, wpa_s->bssid,
1731 wpabuf_head_u8(buf), wpabuf_len(buf), 0);
1732
1733 wpabuf_free(buf);
1734 return ret;
1735 }
1736
1737
ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant * wpa_s,const u8 * sa,const u8 * data,int len)1738 static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s,
1739 const u8 *sa, const u8 *data,
1740 int len)
1741 {
1742 const u8 *pos, *end, *next;
1743 u8 ie, ie_len;
1744
1745 pos = data;
1746 end = data + len;
1747
1748 while (end - pos > 1) {
1749 ie = *pos++;
1750 ie_len = *pos++;
1751 wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u",
1752 ie, ie_len);
1753 if (ie_len > end - pos) {
1754 wpa_printf(MSG_DEBUG, "WNM: Not enough room for "
1755 "subelement");
1756 break;
1757 }
1758 next = pos + ie_len;
1759 if (ie_len < 4) {
1760 pos = next;
1761 continue;
1762 }
1763 wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u",
1764 WPA_GET_BE24(pos), pos[3]);
1765
1766 #ifdef CONFIG_HS20
1767 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
1768 WPA_GET_BE24(pos) == OUI_WFA &&
1769 pos[3] == HS20_WNM_SUB_REM_NEEDED) {
1770 /* Subscription Remediation subelement */
1771 const u8 *ie_end;
1772 u8 url_len;
1773 char *url;
1774 u8 osu_method;
1775
1776 wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation "
1777 "subelement");
1778 ie_end = pos + ie_len;
1779 pos += 4;
1780 url_len = *pos++;
1781 if (url_len == 0) {
1782 wpa_printf(MSG_DEBUG, "WNM: No Server URL included");
1783 url = NULL;
1784 osu_method = 1;
1785 } else {
1786 if (url_len + 1 > ie_end - pos) {
1787 wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)",
1788 url_len,
1789 (int) (ie_end - pos));
1790 break;
1791 }
1792 url = os_malloc(url_len + 1);
1793 if (url == NULL)
1794 break;
1795 os_memcpy(url, pos, url_len);
1796 url[url_len] = '\0';
1797 osu_method = pos[url_len];
1798 }
1799 hs20_rx_subscription_remediation(wpa_s, url,
1800 osu_method);
1801 os_free(url);
1802 pos = next;
1803 continue;
1804 }
1805
1806 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 &&
1807 WPA_GET_BE24(pos) == OUI_WFA &&
1808 pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) {
1809 const u8 *ie_end;
1810 u8 url_len;
1811 char *url;
1812 u8 code;
1813 u16 reauth_delay;
1814
1815 ie_end = pos + ie_len;
1816 pos += 4;
1817 code = *pos++;
1818 reauth_delay = WPA_GET_LE16(pos);
1819 pos += 2;
1820 url_len = *pos++;
1821 wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication "
1822 "Imminent - Reason Code %u "
1823 "Re-Auth Delay %u URL Length %u",
1824 code, reauth_delay, url_len);
1825 if (url_len > ie_end - pos)
1826 break;
1827 url = os_malloc(url_len + 1);
1828 if (url == NULL)
1829 break;
1830 os_memcpy(url, pos, url_len);
1831 url[url_len] = '\0';
1832 hs20_rx_deauth_imminent_notice(wpa_s, code,
1833 reauth_delay, url);
1834 os_free(url);
1835 pos = next;
1836 continue;
1837 }
1838
1839 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
1840 WPA_GET_BE24(pos) == OUI_WFA &&
1841 pos[3] == HS20_WNM_T_C_ACCEPTANCE) {
1842 const u8 *ie_end;
1843 u8 url_len;
1844 char *url;
1845
1846 ie_end = pos + ie_len;
1847 pos += 4;
1848 url_len = *pos++;
1849 wpa_printf(MSG_DEBUG,
1850 "WNM: HS 2.0 Terms and Conditions Acceptance (URL Length %u)",
1851 url_len);
1852 if (url_len > ie_end - pos)
1853 break;
1854 url = os_malloc(url_len + 1);
1855 if (!url)
1856 break;
1857 os_memcpy(url, pos, url_len);
1858 url[url_len] = '\0';
1859 hs20_rx_t_c_acceptance(wpa_s, url);
1860 os_free(url);
1861 pos = next;
1862 continue;
1863 }
1864 #endif /* CONFIG_HS20 */
1865
1866 pos = next;
1867 }
1868 }
1869
1870
ieee802_11_rx_wnm_notif_req(struct wpa_supplicant * wpa_s,const u8 * sa,const u8 * frm,int len)1871 static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s,
1872 const u8 *sa, const u8 *frm, int len)
1873 {
1874 const u8 *pos, *end;
1875 u8 dialog_token, type;
1876
1877 /* Dialog Token [1] | Type [1] | Subelements */
1878
1879 if (len < 2 || sa == NULL)
1880 return;
1881 end = frm + len;
1882 pos = frm;
1883 dialog_token = *pos++;
1884 type = *pos++;
1885
1886 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request "
1887 "(dialog_token %u type %u sa " MACSTR ")",
1888 dialog_token, type, MAC2STR(sa));
1889 wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements",
1890 pos, end - pos);
1891
1892 if (wpa_s->wpa_state != WPA_COMPLETED ||
1893 os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
1894 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not "
1895 "from our AP - ignore it");
1896 return;
1897 }
1898
1899 switch (type) {
1900 case 1:
1901 ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos);
1902 break;
1903 default:
1904 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown "
1905 "WNM-Notification type %u", type);
1906 break;
1907 }
1908 }
1909
1910
ieee802_11_rx_wnm_coloc_intf_req(struct wpa_supplicant * wpa_s,const u8 * sa,const u8 * frm,int len)1911 static void ieee802_11_rx_wnm_coloc_intf_req(struct wpa_supplicant *wpa_s,
1912 const u8 *sa, const u8 *frm,
1913 int len)
1914 {
1915 u8 dialog_token, req_info, auto_report, timeout;
1916
1917 if (!wpa_s->conf->coloc_intf_reporting)
1918 return;
1919
1920 /* Dialog Token [1] | Request Info [1] */
1921
1922 if (len < 2)
1923 return;
1924 dialog_token = frm[0];
1925 req_info = frm[1];
1926 auto_report = req_info & 0x03;
1927 timeout = req_info >> 2;
1928
1929 wpa_dbg(wpa_s, MSG_DEBUG,
1930 "WNM: Received Collocated Interference Request (dialog_token %u auto_report %u timeout %u sa " MACSTR ")",
1931 dialog_token, auto_report, timeout, MAC2STR(sa));
1932
1933 if (dialog_token == 0)
1934 return; /* only nonzero values are used for request */
1935
1936 if (wpa_s->wpa_state != WPA_COMPLETED ||
1937 os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
1938 wpa_dbg(wpa_s, MSG_DEBUG,
1939 "WNM: Collocated Interference Request frame not from current AP - ignore it");
1940 return;
1941 }
1942
1943 wpa_msg(wpa_s, MSG_INFO, COLOC_INTF_REQ "%u %u %u",
1944 dialog_token, auto_report, timeout);
1945 wpa_s->coloc_intf_dialog_token = dialog_token;
1946 wpa_s->coloc_intf_auto_report = auto_report;
1947 wpa_s->coloc_intf_timeout = timeout;
1948 }
1949
1950
ieee802_11_rx_wnm_action(struct wpa_supplicant * wpa_s,const struct ieee80211_mgmt * mgmt,size_t len)1951 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
1952 const struct ieee80211_mgmt *mgmt, size_t len)
1953 {
1954 const u8 *pos, *end;
1955 u8 act;
1956
1957 if (len < IEEE80211_HDRLEN + 2)
1958 return;
1959
1960 pos = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 1;
1961 act = *pos++;
1962 end = ((const u8 *) mgmt) + len;
1963
1964 wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
1965 act, MAC2STR(mgmt->sa));
1966 if (wpa_s->wpa_state < WPA_ASSOCIATED ||
1967 os_memcmp(mgmt->sa, wpa_s->bssid, ETH_ALEN) != 0) {
1968 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
1969 "frame");
1970 return;
1971 }
1972
1973 switch (act) {
1974 case WNM_BSS_TRANS_MGMT_REQ:
1975 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
1976 !(mgmt->da[0] & 0x01));
1977 break;
1978 case WNM_SLEEP_MODE_RESP:
1979 ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos);
1980 break;
1981 case WNM_NOTIFICATION_REQ:
1982 ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos);
1983 break;
1984 case WNM_COLLOCATED_INTERFERENCE_REQ:
1985 ieee802_11_rx_wnm_coloc_intf_req(wpa_s, mgmt->sa, pos,
1986 end - pos);
1987 break;
1988 default:
1989 wpa_printf(MSG_ERROR, "WNM: Unknown request");
1990 break;
1991 }
1992 }
1993
1994
wnm_send_coloc_intf_report(struct wpa_supplicant * wpa_s,u8 dialog_token,const struct wpabuf * elems)1995 int wnm_send_coloc_intf_report(struct wpa_supplicant *wpa_s, u8 dialog_token,
1996 const struct wpabuf *elems)
1997 {
1998 struct wpabuf *buf;
1999 int ret;
2000
2001 if (wpa_s->wpa_state < WPA_ASSOCIATED || !elems)
2002 return -1;
2003
2004 wpa_printf(MSG_DEBUG, "WNM: Send Collocated Interference Report to "
2005 MACSTR " (dialog token %u)",
2006 MAC2STR(wpa_s->bssid), dialog_token);
2007
2008 buf = wpabuf_alloc(3 + wpabuf_len(elems));
2009 if (!buf)
2010 return -1;
2011
2012 wpabuf_put_u8(buf, WLAN_ACTION_WNM);
2013 wpabuf_put_u8(buf, WNM_COLLOCATED_INTERFERENCE_REPORT);
2014 wpabuf_put_u8(buf, dialog_token);
2015 wpabuf_put_buf(buf, elems);
2016
2017 ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
2018 wpa_s->own_addr, wpa_s->bssid,
2019 wpabuf_head_u8(buf), wpabuf_len(buf), 0);
2020 wpabuf_free(buf);
2021 return ret;
2022 }
2023
2024
wnm_set_coloc_intf_elems(struct wpa_supplicant * wpa_s,struct wpabuf * elems)2025 void wnm_set_coloc_intf_elems(struct wpa_supplicant *wpa_s,
2026 struct wpabuf *elems)
2027 {
2028 wpabuf_free(wpa_s->coloc_intf_elems);
2029 if (elems && wpabuf_len(elems) == 0) {
2030 wpabuf_free(elems);
2031 elems = NULL;
2032 }
2033 wpa_s->coloc_intf_elems = elems;
2034
2035 if (wpa_s->conf->coloc_intf_reporting && wpa_s->coloc_intf_elems &&
2036 wpa_s->coloc_intf_dialog_token &&
2037 (wpa_s->coloc_intf_auto_report == 1 ||
2038 wpa_s->coloc_intf_auto_report == 3)) {
2039 /* TODO: Check that there has not been less than
2040 * wpa_s->coloc_intf_timeout * 200 TU from the last report.
2041 */
2042 wnm_send_coloc_intf_report(wpa_s,
2043 wpa_s->coloc_intf_dialog_token,
2044 wpa_s->coloc_intf_elems);
2045 }
2046 }
2047
2048
wnm_clear_coloc_intf_reporting(struct wpa_supplicant * wpa_s)2049 void wnm_clear_coloc_intf_reporting(struct wpa_supplicant *wpa_s)
2050 {
2051 #ifdef CONFIG_WNM
2052 wpa_s->coloc_intf_dialog_token = 0;
2053 wpa_s->coloc_intf_auto_report = 0;
2054 #endif /* CONFIG_WNM */
2055 }
2056