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 #ifndef CONFIG_NO_WPA
237 u8 *ptr, *end;
238 u8 gtk_len;
239 #endif /* CONFIG_NO_WPA */
240
241 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM, wpa_s->bssid,
242 NULL, NULL);
243
244 #ifndef CONFIG_NO_WPA
245 /* Install GTK/IGTK */
246
247 /* point to key data field */
248 ptr = (u8 *) frm + 1 + 2;
249 end = ptr + key_len_total;
250 wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
251
252 if (key_len_total && !wpa_sm_pmf_enabled(wpa_s->wpa)) {
253 wpa_msg(wpa_s, MSG_INFO,
254 "WNM: Ignore Key Data in WNM-Sleep Mode Response - PMF not enabled");
255 return;
256 }
257
258 while (end - ptr > 1) {
259 if (2 + ptr[1] > end - ptr) {
260 wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
261 "length");
262 if (end > ptr) {
263 wpa_hexdump(MSG_DEBUG, "WNM: Remaining data",
264 ptr, end - ptr);
265 }
266 break;
267 }
268 if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
269 if (ptr[1] < 11 + 5) {
270 wpa_printf(MSG_DEBUG, "WNM: Too short GTK "
271 "subelem");
272 break;
273 }
274 gtk_len = *(ptr + 4);
275 if (ptr[1] < 11 + gtk_len ||
276 gtk_len < 5 || gtk_len > 32) {
277 wpa_printf(MSG_DEBUG, "WNM: Invalid GTK "
278 "subelem");
279 break;
280 }
281 wpa_wnmsleep_install_key(
282 wpa_s->wpa,
283 WNM_SLEEP_SUBELEM_GTK,
284 ptr);
285 ptr += 13 + gtk_len;
286 } else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) {
287 if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) {
288 wpa_printf(MSG_DEBUG, "WNM: Too short IGTK "
289 "subelem");
290 break;
291 }
292 wpa_wnmsleep_install_key(wpa_s->wpa,
293 WNM_SLEEP_SUBELEM_IGTK, ptr);
294 ptr += 10 + WPA_IGTK_LEN;
295 } else if (*ptr == WNM_SLEEP_SUBELEM_BIGTK) {
296 if (ptr[1] < 2 + 6 + WPA_BIGTK_LEN) {
297 wpa_printf(MSG_DEBUG,
298 "WNM: Too short BIGTK subelem");
299 break;
300 }
301 wpa_wnmsleep_install_key(wpa_s->wpa,
302 WNM_SLEEP_SUBELEM_BIGTK, ptr);
303 ptr += 10 + WPA_BIGTK_LEN;
304 } else
305 break; /* skip the loop */
306 }
307 #endif /* CONFIG_NO_WPA */
308 }
309
310
ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant * wpa_s,const u8 * frm,int len)311 static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
312 const u8 *frm, int len)
313 {
314 /*
315 * Action [1] | Dialog Token [1] | Key Data Len [2] | Key Data |
316 * WNM-Sleep Mode IE | TFS Response IE
317 */
318 const u8 *pos = frm; /* point to payload after the action field */
319 u16 key_len_total;
320 struct wnm_sleep_element *wnmsleep_ie = NULL;
321 /* multiple TFS Resp IE (assuming consecutive) */
322 const u8 *tfsresp_ie_start = NULL;
323 const u8 *tfsresp_ie_end = NULL;
324 #ifdef CONFIG_OCV
325 const u8 *oci_ie = NULL;
326 u8 oci_ie_len = 0;
327 #endif /* CONFIG_OCV */
328 size_t left;
329
330 if (!wpa_s->wnmsleep_used) {
331 wpa_printf(MSG_DEBUG,
332 "WNM: Ignore WNM-Sleep Mode Response frame since WNM-Sleep Mode operation has not been requested");
333 return;
334 }
335
336 if (len < 3)
337 return;
338 key_len_total = WPA_GET_LE16(frm + 1);
339
340 wpa_printf(MSG_DEBUG, "WNM-Sleep Mode Response token=%u key_len_total=%d",
341 frm[0], key_len_total);
342 left = len - 3;
343 if (key_len_total > left) {
344 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
345 return;
346 }
347 pos += 3 + key_len_total;
348 while (pos - frm + 1 < len) {
349 u8 ie_len = *(pos + 1);
350 if (2 + ie_len > frm + len - pos) {
351 wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
352 break;
353 }
354 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
355 if (*pos == WLAN_EID_WNMSLEEP && ie_len >= 4)
356 wnmsleep_ie = (struct wnm_sleep_element *) pos;
357 else if (*pos == WLAN_EID_TFS_RESP) {
358 if (!tfsresp_ie_start)
359 tfsresp_ie_start = pos;
360 tfsresp_ie_end = pos;
361 #ifdef CONFIG_OCV
362 } else if (*pos == WLAN_EID_EXTENSION && ie_len >= 1 &&
363 pos[2] == WLAN_EID_EXT_OCV_OCI) {
364 oci_ie = pos + 3;
365 oci_ie_len = ie_len - 1;
366 #endif /* CONFIG_OCV */
367 } else
368 wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
369 pos += ie_len + 2;
370 }
371
372 if (!wnmsleep_ie) {
373 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
374 return;
375 }
376
377 #ifdef CONFIG_OCV
378 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT &&
379 wpa_sm_ocv_enabled(wpa_s->wpa)) {
380 struct wpa_channel_info ci;
381
382 if (wpa_drv_channel_info(wpa_s, &ci) != 0) {
383 wpa_msg(wpa_s, MSG_WARNING,
384 "Failed to get channel info to validate received OCI in WNM-Sleep Mode frame");
385 return;
386 }
387
388 if (ocv_verify_tx_params(oci_ie, oci_ie_len, &ci,
389 channel_width_to_int(ci.chanwidth),
390 ci.seg1_idx) != OCI_SUCCESS) {
391 wpa_msg(wpa_s, MSG_WARNING, "WNM: OCV failed: %s",
392 ocv_errorstr);
393 return;
394 }
395 }
396 #endif /* CONFIG_OCV */
397
398 wpa_s->wnmsleep_used = 0;
399
400 if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
401 wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
402 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
403 "frame (action=%d, intval=%d)",
404 wnmsleep_ie->action_type, wnmsleep_ie->intval);
405 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
406 wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
407 tfsresp_ie_end);
408 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
409 wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
410 }
411 } else {
412 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
413 "(action=%d, intval=%d)",
414 wnmsleep_ie->action_type, wnmsleep_ie->intval);
415 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
416 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
417 wpa_s->bssid, NULL, NULL);
418 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
419 wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
420 wpa_s->bssid, NULL, NULL);
421 }
422 }
423
424
wnm_btm_reset(struct wpa_supplicant * wpa_s)425 void wnm_btm_reset(struct wpa_supplicant *wpa_s)
426 {
427 int i;
428
429 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
430 os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot);
431 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid);
432 }
433
434 wpa_s->wnm_num_neighbor_report = 0;
435 os_free(wpa_s->wnm_neighbor_report_elements);
436 wpa_s->wnm_neighbor_report_elements = NULL;
437
438 wpa_s->wnm_cand_valid_until.sec = 0;
439 wpa_s->wnm_cand_valid_until.usec = 0;
440
441 wpa_s->wnm_mode = 0;
442 wpa_s->wnm_dialog_token = 0;
443 wpa_s->wnm_reply = 0;
444
445 #ifdef CONFIG_MBO
446 wpa_s->wnm_mbo_trans_reason_present = 0;
447 wpa_s->wnm_mbo_transition_reason = 0;
448 #endif /* CONFIG_MBO */
449 }
450
451
wnm_parse_neighbor_report_elem(struct neighbor_report * rep,u8 id,u8 elen,const u8 * pos)452 static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep,
453 u8 id, u8 elen, const u8 *pos)
454 {
455 switch (id) {
456 case WNM_NEIGHBOR_TSF:
457 if (elen < 2 + 2) {
458 wpa_printf(MSG_DEBUG, "WNM: Too short TSF");
459 break;
460 }
461 rep->tsf_offset = WPA_GET_LE16(pos);
462 rep->beacon_int = WPA_GET_LE16(pos + 2);
463 rep->tsf_present = 1;
464 break;
465 case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
466 if (elen < 2) {
467 wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
468 "country string");
469 break;
470 }
471 os_memcpy(rep->country, pos, 2);
472 rep->country_present = 1;
473 break;
474 case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
475 if (elen < 1) {
476 wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
477 "candidate");
478 break;
479 }
480 rep->preference = pos[0];
481 rep->preference_present = 1;
482 break;
483 case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
484 if (elen < 10) {
485 wpa_printf(MSG_DEBUG,
486 "WNM: Too short BSS termination duration");
487 break;
488 }
489 rep->bss_term_tsf = WPA_GET_LE64(pos);
490 rep->bss_term_dur = WPA_GET_LE16(pos + 8);
491 rep->bss_term_present = 1;
492 break;
493 case WNM_NEIGHBOR_BEARING:
494 if (elen < 8) {
495 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
496 "bearing");
497 break;
498 }
499 rep->bearing = WPA_GET_LE16(pos);
500 rep->distance = WPA_GET_LE32(pos + 2);
501 rep->rel_height = WPA_GET_LE16(pos + 2 + 4);
502 rep->bearing_present = 1;
503 break;
504 case WNM_NEIGHBOR_MEASUREMENT_PILOT:
505 if (elen < 1) {
506 wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
507 "pilot");
508 break;
509 }
510 os_free(rep->meas_pilot);
511 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
512 if (rep->meas_pilot == NULL)
513 break;
514 rep->meas_pilot->measurement_pilot = pos[0];
515 rep->meas_pilot->subelem_len = elen - 1;
516 os_memcpy(rep->meas_pilot->subelems, pos + 1, elen - 1);
517 break;
518 case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
519 if (elen < 5) {
520 wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
521 "capabilities");
522 break;
523 }
524 os_memcpy(rep->rm_capab, pos, 5);
525 rep->rm_capab_present = 1;
526 break;
527 case WNM_NEIGHBOR_MULTIPLE_BSSID:
528 if (elen < 1) {
529 wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
530 break;
531 }
532 os_free(rep->mul_bssid);
533 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
534 if (rep->mul_bssid == NULL)
535 break;
536 rep->mul_bssid->max_bssid_indicator = pos[0];
537 rep->mul_bssid->subelem_len = elen - 1;
538 os_memcpy(rep->mul_bssid->subelems, pos + 1, elen - 1);
539 break;
540 default:
541 wpa_printf(MSG_DEBUG,
542 "WNM: Unsupported neighbor report subelement id %u",
543 id);
544 break;
545 }
546 }
547
548
wnm_nei_get_chan(struct wpa_supplicant * wpa_s,u8 op_class,u8 chan)549 static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan)
550 {
551 struct wpa_bss *bss = wpa_s->current_bss;
552 const char *country = NULL;
553 int freq;
554
555 if (bss) {
556 const u8 *elem = wpa_bss_get_ie(bss, WLAN_EID_COUNTRY);
557
558 if (elem && elem[1] >= 2)
559 country = (const char *) (elem + 2);
560 }
561
562 freq = ieee80211_chan_to_freq(country, op_class, chan);
563 if (freq <= 0 && op_class == 0) {
564 /*
565 * Some APs do not advertise correct operating class
566 * information. Try to determine the most likely operating
567 * frequency based on the channel number.
568 */
569 if (chan >= 1 && chan <= 13)
570 freq = 2407 + chan * 5;
571 else if (chan == 14)
572 freq = 2484;
573 else if (chan >= 36 && chan <= 177)
574 freq = 5000 + chan * 5;
575 }
576 return freq;
577 }
578
579
wnm_parse_neighbor_report(struct wpa_supplicant * wpa_s,const u8 * pos,u8 len,struct neighbor_report * rep)580 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
581 const u8 *pos, u8 len,
582 struct neighbor_report *rep)
583 {
584 u8 left = len;
585
586 if (left < 13) {
587 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
588 return;
589 }
590
591 os_memcpy(rep->bssid, pos, ETH_ALEN);
592 rep->bssid_info = WPA_GET_LE32(pos + ETH_ALEN);
593 rep->regulatory_class = *(pos + 10);
594 rep->channel_number = *(pos + 11);
595 rep->phy_type = *(pos + 12);
596
597 pos += 13;
598 left -= 13;
599
600 while (left >= 2) {
601 u8 id, elen;
602
603 id = *pos++;
604 elen = *pos++;
605 wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen);
606 left -= 2;
607 if (elen > left) {
608 wpa_printf(MSG_DEBUG,
609 "WNM: Truncated neighbor report subelement");
610 break;
611 }
612 wnm_parse_neighbor_report_elem(rep, id, elen, pos);
613 left -= elen;
614 pos += elen;
615 }
616
617 rep->freq = wnm_nei_get_chan(wpa_s, rep->regulatory_class,
618 rep->channel_number);
619 }
620
621
wnm_clear_acceptable(struct wpa_supplicant * wpa_s)622 static void wnm_clear_acceptable(struct wpa_supplicant *wpa_s)
623 {
624 unsigned int i;
625
626 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++)
627 wpa_s->wnm_neighbor_report_elements[i].acceptable = 0;
628 }
629
630 #ifdef CONFIG_MBO
631 static struct wpa_bss *
get_mbo_transition_candidate(struct wpa_supplicant * wpa_s,enum mbo_transition_reject_reason * reason)632 get_mbo_transition_candidate(struct wpa_supplicant *wpa_s,
633 enum mbo_transition_reject_reason *reason)
634 {
635 struct wpa_bss *target = NULL;
636 struct wpa_bss_trans_info params;
637 struct wpa_bss_candidate_info *info = NULL;
638 struct neighbor_report *nei = wpa_s->wnm_neighbor_report_elements;
639 u8 *first_candidate_bssid = NULL, *pos;
640 unsigned int i;
641
642 params.mbo_transition_reason = wpa_s->wnm_mbo_transition_reason;
643 params.n_candidates = 0;
644 params.bssid = os_calloc(wpa_s->wnm_num_neighbor_report, ETH_ALEN);
645 if (!params.bssid)
646 return NULL;
647
648 pos = params.bssid;
649 for (i = 0; i < wpa_s->wnm_num_neighbor_report; nei++, i++) {
650 if (nei->is_first)
651 first_candidate_bssid = nei->bssid;
652 if (!nei->acceptable)
653 continue;
654 os_memcpy(pos, nei->bssid, ETH_ALEN);
655 pos += ETH_ALEN;
656 params.n_candidates++;
657 }
658
659 if (!params.n_candidates)
660 goto end;
661
662 info = wpa_drv_get_bss_trans_status(wpa_s, ¶ms);
663 if (!info) {
664 /* If failed to get candidate BSS transition status from driver,
665 * get the first acceptable candidate from wpa_supplicant.
666 */
667 target = wpa_bss_get_bssid(wpa_s, params.bssid);
668 goto end;
669 }
670
671 /* Get the first acceptable candidate from driver */
672 for (i = 0; i < info->num; i++) {
673 if (info->candidates[i].is_accept) {
674 target = wpa_bss_get_bssid(wpa_s,
675 info->candidates[i].bssid);
676 goto end;
677 }
678 }
679
680 /* If Disassociation Imminent is set and driver rejects all the
681 * candidate select first acceptable candidate which has
682 * rssi > disassoc_imminent_rssi_threshold
683 */
684 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
685 for (i = 0; i < info->num; i++) {
686 target = wpa_bss_get_bssid(wpa_s,
687 info->candidates[i].bssid);
688 if (target &&
689 (target->level <
690 wpa_s->conf->disassoc_imminent_rssi_threshold))
691 continue;
692 goto end;
693 }
694 }
695
696 /* While sending BTM reject use reason code of the first candidate
697 * received in BTM request frame
698 */
699 if (reason) {
700 for (i = 0; i < info->num; i++) {
701 if (first_candidate_bssid &&
702 ether_addr_equal(first_candidate_bssid,
703 info->candidates[i].bssid)) {
704 *reason = info->candidates[i].reject_reason;
705 break;
706 }
707 }
708 }
709
710 target = NULL;
711
712 end:
713 os_free(params.bssid);
714 if (info) {
715 os_free(info->candidates);
716 os_free(info);
717 }
718 return target;
719 }
720 #endif /* CONFIG_MBO */
721
722
find_better_target(struct wpa_bss * a,struct wpa_bss * b)723 static struct wpa_bss * find_better_target(struct wpa_bss *a,
724 struct wpa_bss *b)
725 {
726 if (!a)
727 return b;
728 if (!b)
729 return a;
730
731 if (a->est_throughput > b->est_throughput) {
732 wpa_printf(MSG_DEBUG, "WNM: A is better: " MACSTR
733 " est-tput: %d B: " MACSTR " est-tput: %d",
734 MAC2STR(a->bssid), a->est_throughput,
735 MAC2STR(b->bssid), b->est_throughput);
736 return a;
737 }
738
739 wpa_printf(MSG_DEBUG, "WNM: B is better, A: " MACSTR
740 " est-tput: %d B: " MACSTR " est-tput: %d",
741 MAC2STR(a->bssid), a->est_throughput,
742 MAC2STR(b->bssid), b->est_throughput);
743 return b;
744 }
745
746 static struct wpa_bss *
compare_scan_neighbor_results(struct wpa_supplicant * wpa_s,os_time_t age_secs,enum mbo_transition_reject_reason * reason)747 compare_scan_neighbor_results(struct wpa_supplicant *wpa_s, os_time_t age_secs,
748 enum mbo_transition_reject_reason *reason)
749 {
750 u8 i;
751 struct wpa_bss *bss = wpa_s->current_bss;
752 struct wpa_bss *target;
753 struct wpa_bss *best_target = NULL;
754 struct wpa_bss *bss_in_list = NULL;
755
756 if (!bss)
757 return NULL;
758
759 wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
760 MAC2STR(wpa_s->bssid), bss->level);
761
762 wnm_clear_acceptable(wpa_s);
763
764 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
765 struct neighbor_report *nei;
766
767 nei = &wpa_s->wnm_neighbor_report_elements[i];
768 if (nei->preference_present && nei->preference == 0) {
769 wpa_printf(MSG_DEBUG, "Skip excluded BSS " MACSTR,
770 MAC2STR(nei->bssid));
771 continue;
772 }
773
774 target = wpa_bss_get_bssid(wpa_s, nei->bssid);
775 if (!target) {
776 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
777 " (pref %d) not found in scan results",
778 MAC2STR(nei->bssid),
779 nei->preference_present ? nei->preference :
780 -1);
781 continue;
782 }
783
784 if (age_secs) {
785 struct os_reltime now;
786
787 if (os_get_reltime(&now) == 0 &&
788 os_reltime_expired(&now, &target->last_update,
789 age_secs)) {
790 wpa_printf(MSG_DEBUG,
791 "Candidate BSS is more than %ld seconds old",
792 age_secs);
793 continue;
794 }
795 }
796
797 /*
798 * TODO: Could consider allowing transition to another ESS if
799 * PMF was enabled for the association.
800 */
801 if (!wpa_scan_res_match(wpa_s, 0, target, wpa_s->current_ssid,
802 1, 0)) {
803 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
804 " (pref %d) does not match the current network profile",
805 MAC2STR(nei->bssid),
806 nei->preference_present ? nei->preference :
807 -1);
808 continue;
809 }
810
811 if (target->level < bss->level && target->level < -80) {
812 wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
813 " (pref %d) does not have sufficient signal level (%d)",
814 MAC2STR(nei->bssid),
815 nei->preference_present ? nei->preference :
816 -1,
817 target->level);
818 continue;
819 }
820
821 nei->acceptable = 1;
822
823 best_target = find_better_target(target, best_target);
824 if (target == bss)
825 bss_in_list = bss;
826 }
827
828 #ifdef CONFIG_MBO
829 if (wpa_s->wnm_mbo_trans_reason_present)
830 target = get_mbo_transition_candidate(wpa_s, reason);
831 else
832 target = best_target;
833 #else /* CONFIG_MBO */
834 target = best_target;
835 #endif /* CONFIG_MBO */
836
837 if (!target)
838 return NULL;
839
840 wpa_printf(MSG_DEBUG,
841 "WNM: Found an acceptable preferred transition candidate BSS "
842 MACSTR " (RSSI %d, tput: %d bss-tput: %d)",
843 MAC2STR(target->bssid), target->level,
844 target->est_throughput, bss->est_throughput);
845
846 if (!bss_in_list)
847 return target;
848
849 if ((!target->est_throughput && !bss_in_list->est_throughput) ||
850 (target->est_throughput > bss_in_list->est_throughput &&
851 target->est_throughput - bss_in_list->est_throughput >
852 bss_in_list->est_throughput >> 4)) {
853 /* It is more than 100/16 percent better, so switch. */
854 return target;
855 }
856
857 wpa_printf(MSG_DEBUG,
858 "WNM: Stay with our current BSS, not enough change in estimated throughput to switch");
859 return bss_in_list;
860 }
861
862
wpa_bss_ies_eq(struct wpa_bss * a,struct wpa_bss * b,u8 eid)863 static int wpa_bss_ies_eq(struct wpa_bss *a, struct wpa_bss *b, u8 eid)
864 {
865 const u8 *ie_a, *ie_b;
866
867 if (!a || !b)
868 return 0;
869
870 ie_a = wpa_bss_get_ie(a, eid);
871 ie_b = wpa_bss_get_ie(b, eid);
872
873 if (!ie_a || !ie_b || ie_a[1] != ie_b[1])
874 return 0;
875
876 return os_memcmp(ie_a, ie_b, ie_a[1]) == 0;
877 }
878
879
wnm_get_bss_info(struct wpa_supplicant * wpa_s,struct wpa_bss * bss)880 static u32 wnm_get_bss_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
881 {
882 u32 info = 0;
883
884 info |= NEI_REP_BSSID_INFO_AP_UNKNOWN_REACH;
885
886 /*
887 * Leave the security and key scope bits unset to indicate that the
888 * security information is not available.
889 */
890
891 if (bss->caps & WLAN_CAPABILITY_SPECTRUM_MGMT)
892 info |= NEI_REP_BSSID_INFO_SPECTRUM_MGMT;
893 if (bss->caps & WLAN_CAPABILITY_QOS)
894 info |= NEI_REP_BSSID_INFO_QOS;
895 if (bss->caps & WLAN_CAPABILITY_APSD)
896 info |= NEI_REP_BSSID_INFO_APSD;
897 if (bss->caps & WLAN_CAPABILITY_RADIO_MEASUREMENT)
898 info |= NEI_REP_BSSID_INFO_RM;
899 if (bss->caps & WLAN_CAPABILITY_DELAYED_BLOCK_ACK)
900 info |= NEI_REP_BSSID_INFO_DELAYED_BA;
901 if (bss->caps & WLAN_CAPABILITY_IMM_BLOCK_ACK)
902 info |= NEI_REP_BSSID_INFO_IMM_BA;
903 if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_MOBILITY_DOMAIN))
904 info |= NEI_REP_BSSID_INFO_MOBILITY_DOMAIN;
905 if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_HT_CAP))
906 info |= NEI_REP_BSSID_INFO_HT;
907
908 return info;
909 }
910
911
wnm_add_nei_rep(struct wpabuf ** buf,const u8 * bssid,u32 bss_info,u8 op_class,u8 chan,u8 phy_type,u8 pref)912 static int wnm_add_nei_rep(struct wpabuf **buf, const u8 *bssid,
913 u32 bss_info, u8 op_class, u8 chan, u8 phy_type,
914 u8 pref)
915 {
916 if (wpabuf_len(*buf) + 18 >
917 IEEE80211_MAX_MMPDU_SIZE - IEEE80211_HDRLEN) {
918 wpa_printf(MSG_DEBUG,
919 "WNM: No room in frame for Neighbor Report element");
920 return -1;
921 }
922
923 if (wpabuf_resize(buf, 18) < 0) {
924 wpa_printf(MSG_DEBUG,
925 "WNM: Failed to allocate memory for Neighbor Report element");
926 return -1;
927 }
928
929 wpabuf_put_u8(*buf, WLAN_EID_NEIGHBOR_REPORT);
930 /* length: 13 for basic neighbor report + 3 for preference subelement */
931 wpabuf_put_u8(*buf, 16);
932 wpabuf_put_data(*buf, bssid, ETH_ALEN);
933 wpabuf_put_le32(*buf, bss_info);
934 wpabuf_put_u8(*buf, op_class);
935 wpabuf_put_u8(*buf, chan);
936 wpabuf_put_u8(*buf, phy_type);
937 wpabuf_put_u8(*buf, WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE);
938 wpabuf_put_u8(*buf, 1);
939 wpabuf_put_u8(*buf, pref);
940 return 0;
941 }
942
943
wnm_nei_rep_add_bss(struct wpa_supplicant * wpa_s,struct wpa_bss * bss,struct wpabuf ** buf,u8 pref)944 static int wnm_nei_rep_add_bss(struct wpa_supplicant *wpa_s,
945 struct wpa_bss *bss, struct wpabuf **buf,
946 u8 pref)
947 {
948 const u8 *ie;
949 u8 op_class, chan;
950 int sec_chan = 0;
951 enum oper_chan_width vht = CONF_OPER_CHWIDTH_USE_HT;
952 enum phy_type phy_type;
953 u32 info;
954 struct ieee80211_ht_operation *ht_oper = NULL;
955 struct ieee80211_vht_operation *vht_oper = NULL;
956
957 ie = wpa_bss_get_ie(bss, WLAN_EID_HT_OPERATION);
958 if (ie && ie[1] >= 2) {
959 ht_oper = (struct ieee80211_ht_operation *) (ie + 2);
960
961 if (ht_oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
962 sec_chan = 1;
963 else if (ht_oper->ht_param &
964 HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
965 sec_chan = -1;
966 }
967
968 ie = wpa_bss_get_ie(bss, WLAN_EID_VHT_OPERATION);
969 if (ie && ie[1] >= 1) {
970 vht_oper = (struct ieee80211_vht_operation *) (ie + 2);
971
972 if (vht_oper->vht_op_info_chwidth == CHANWIDTH_80MHZ ||
973 vht_oper->vht_op_info_chwidth == CHANWIDTH_160MHZ ||
974 vht_oper->vht_op_info_chwidth == CHANWIDTH_80P80MHZ)
975 vht = vht_oper->vht_op_info_chwidth;
976 }
977
978 if (ieee80211_freq_to_channel_ext(bss->freq, sec_chan, vht, &op_class,
979 &chan) == NUM_HOSTAPD_MODES) {
980 wpa_printf(MSG_DEBUG,
981 "WNM: Cannot determine operating class and channel");
982 return -2;
983 }
984
985 phy_type = ieee80211_get_phy_type(bss->freq, (ht_oper != NULL),
986 (vht_oper != NULL));
987 if (phy_type == PHY_TYPE_UNSPECIFIED) {
988 wpa_printf(MSG_DEBUG,
989 "WNM: Cannot determine BSS phy type for Neighbor Report");
990 return -2;
991 }
992
993 info = wnm_get_bss_info(wpa_s, bss);
994
995 return wnm_add_nei_rep(buf, bss->bssid, info, op_class, chan, phy_type,
996 pref);
997 }
998
999
wnm_add_cand_list(struct wpa_supplicant * wpa_s,struct wpabuf ** buf)1000 static void wnm_add_cand_list(struct wpa_supplicant *wpa_s, struct wpabuf **buf)
1001 {
1002 unsigned int i, pref = 255;
1003 struct os_reltime now;
1004 struct wpa_ssid *ssid = wpa_s->current_ssid;
1005
1006 if (!ssid)
1007 return;
1008
1009 /*
1010 * TODO: Define when scan results are no longer valid for the candidate
1011 * list.
1012 */
1013 os_get_reltime(&now);
1014 if (os_reltime_expired(&now, &wpa_s->last_scan, 10))
1015 return;
1016
1017 wpa_printf(MSG_DEBUG,
1018 "WNM: Add candidate list to BSS Transition Management Response frame");
1019 for (i = 0; i < wpa_s->last_scan_res_used && pref; i++) {
1020 struct wpa_bss *bss = wpa_s->last_scan_res[i];
1021 int res;
1022
1023 if (wpa_scan_res_match(wpa_s, i, bss, ssid, 1, 0)) {
1024 res = wnm_nei_rep_add_bss(wpa_s, bss, buf, pref--);
1025 if (res == -2)
1026 continue; /* could not build entry for BSS */
1027 if (res < 0)
1028 break; /* no more room for candidates */
1029 if (pref == 1)
1030 break;
1031 }
1032 }
1033
1034 wpa_hexdump_buf(MSG_DEBUG,
1035 "WNM: BSS Transition Management Response candidate list",
1036 *buf);
1037 }
1038
1039
1040 #define BTM_RESP_MIN_SIZE 5 + ETH_ALEN
1041
wnm_send_bss_transition_mgmt_resp(struct wpa_supplicant * wpa_s,enum bss_trans_mgmt_status_code status,enum mbo_transition_reject_reason reason,u8 delay,const u8 * target_bssid)1042 static int wnm_send_bss_transition_mgmt_resp(
1043 struct wpa_supplicant *wpa_s,
1044 enum bss_trans_mgmt_status_code status,
1045 enum mbo_transition_reject_reason reason,
1046 u8 delay, const u8 *target_bssid)
1047 {
1048 struct wpabuf *buf;
1049 int res;
1050
1051 wpa_s->wnm_reply = 0;
1052
1053 wpa_printf(MSG_DEBUG,
1054 "WNM: Send BSS Transition Management Response to " MACSTR
1055 " dialog_token=%u status=%u reason=%u delay=%d",
1056 MAC2STR(wpa_s->bssid), wpa_s->wnm_dialog_token, status,
1057 reason, delay);
1058 if (!wpa_s->current_bss) {
1059 wpa_printf(MSG_DEBUG,
1060 "WNM: Current BSS not known - drop response");
1061 return -1;
1062 }
1063
1064 buf = wpabuf_alloc(BTM_RESP_MIN_SIZE);
1065 if (!buf) {
1066 wpa_printf(MSG_DEBUG,
1067 "WNM: Failed to allocate memory for BTM response");
1068 return -1;
1069 }
1070
1071 wpa_s->bss_tm_status = status;
1072 wpas_notify_bss_tm_status(wpa_s);
1073
1074 wpabuf_put_u8(buf, WLAN_ACTION_WNM);
1075 wpabuf_put_u8(buf, WNM_BSS_TRANS_MGMT_RESP);
1076 wpabuf_put_u8(buf, wpa_s->wnm_dialog_token);
1077 wpabuf_put_u8(buf, status);
1078 wpabuf_put_u8(buf, delay);
1079 if (target_bssid) {
1080 wpabuf_put_data(buf, target_bssid, ETH_ALEN);
1081 } else if (status == WNM_BSS_TM_ACCEPT) {
1082 /*
1083 * P802.11-REVmc clarifies that the Target BSSID field is always
1084 * present when status code is zero, so use a fake value here if
1085 * no BSSID is yet known.
1086 */
1087 wpabuf_put_data(buf, "\0\0\0\0\0\0", ETH_ALEN);
1088 }
1089
1090 if (status == WNM_BSS_TM_ACCEPT && target_bssid)
1091 wnm_add_cand_list(wpa_s, &buf);
1092
1093 #ifdef CONFIG_MBO
1094 if (status != WNM_BSS_TM_ACCEPT &&
1095 wpa_bss_get_vendor_ie(wpa_s->current_bss, MBO_IE_VENDOR_TYPE)) {
1096 u8 mbo[10];
1097 size_t ret;
1098
1099 ret = wpas_mbo_ie_bss_trans_reject(wpa_s, mbo, sizeof(mbo),
1100 reason);
1101 if (ret) {
1102 if (wpabuf_resize(&buf, ret) < 0) {
1103 wpabuf_free(buf);
1104 wpa_printf(MSG_DEBUG,
1105 "WNM: Failed to allocate memory for MBO IE");
1106 return -1;
1107 }
1108
1109 wpabuf_put_data(buf, mbo, ret);
1110 }
1111 }
1112 #endif /* CONFIG_MBO */
1113
1114 res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
1115 wpa_s->own_addr, wpa_s->bssid,
1116 wpabuf_head_u8(buf), wpabuf_len(buf), 0);
1117 if (res < 0) {
1118 wpa_printf(MSG_DEBUG,
1119 "WNM: Failed to send BSS Transition Management Response");
1120 }
1121
1122 wpabuf_free(buf);
1123
1124 return res;
1125 }
1126
1127
wnm_bss_tm_connect(struct wpa_supplicant * wpa_s,struct wpa_bss * bss,struct wpa_ssid * ssid,int after_new_scan)1128 static void wnm_bss_tm_connect(struct wpa_supplicant *wpa_s,
1129 struct wpa_bss *bss, struct wpa_ssid *ssid,
1130 int after_new_scan)
1131 {
1132 struct wpa_radio_work *already_connecting;
1133
1134 wpa_dbg(wpa_s, MSG_DEBUG,
1135 "WNM: Transition to BSS " MACSTR
1136 " based on BSS Transition Management Request (old BSSID "
1137 MACSTR " after_new_scan=%d)",
1138 MAC2STR(bss->bssid), MAC2STR(wpa_s->bssid), after_new_scan);
1139
1140 /* Send the BSS Management Response - Accept */
1141 if (wpa_s->wnm_reply) {
1142 wpa_s->wnm_target_bss = bss;
1143 wpa_printf(MSG_DEBUG,
1144 "WNM: Sending successful BSS Transition Management Response");
1145
1146 /* This function will be called again from the TX handler to
1147 * start the actual reassociation after this response has been
1148 * delivered to the current AP. */
1149 if (wnm_send_bss_transition_mgmt_resp(
1150 wpa_s, WNM_BSS_TM_ACCEPT,
1151 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
1152 bss->bssid) >= 0)
1153 return;
1154 }
1155
1156 if (bss == wpa_s->current_bss) {
1157 wpa_printf(MSG_DEBUG,
1158 "WNM: Already associated with the preferred candidate");
1159 wnm_btm_reset(wpa_s);
1160 return;
1161 }
1162
1163 already_connecting = radio_work_pending(wpa_s, "sme-connect");
1164 wpa_s->reassociate = 1;
1165 wpa_printf(MSG_DEBUG, "WNM: Issuing connect");
1166 wpa_supplicant_connect(wpa_s, bss, ssid);
1167
1168 /*
1169 * Indicate that a BSS transition is in progress so scan results that
1170 * come in before the 'sme-connect' radio work gets executed do not
1171 * override the original connection attempt.
1172 */
1173 if (!already_connecting && radio_work_pending(wpa_s, "sme-connect"))
1174 wpa_s->bss_trans_mgmt_in_progress = true;
1175 }
1176
1177
wnm_scan_process(struct wpa_supplicant * wpa_s,bool pre_scan_check)1178 int wnm_scan_process(struct wpa_supplicant *wpa_s, bool pre_scan_check)
1179 {
1180 struct wpa_bss *bss;
1181 struct wpa_ssid *ssid = wpa_s->current_ssid;
1182 enum bss_trans_mgmt_status_code status = WNM_BSS_TM_REJECT_UNSPECIFIED;
1183 enum mbo_transition_reject_reason reason =
1184 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED;
1185
1186 if (!wpa_s->wnm_dialog_token)
1187 return 0;
1188
1189 wpa_dbg(wpa_s, MSG_DEBUG,
1190 "WNM: Process scan results for BSS Transition Management");
1191 if (!pre_scan_check &&
1192 os_reltime_initialized(&wpa_s->wnm_cand_valid_until) &&
1193 os_reltime_before(&wpa_s->wnm_cand_valid_until,
1194 &wpa_s->scan_trigger_time)) {
1195 wpa_printf(MSG_DEBUG, "WNM: Previously stored BSS transition candidate list is not valid anymore - drop it");
1196 goto send_bss_resp_fail;
1197 }
1198
1199 /* Compare the Neighbor Report and scan results */
1200 bss = compare_scan_neighbor_results(wpa_s, 0, &reason);
1201
1202 /*
1203 * If this is a pre-scan check, returning 0 will trigger a scan and
1204 * another call. In that case, reject "bad" candidates in the hope of
1205 * finding a better candidate after scanning.
1206 *
1207 * Use a simple heuristic to check whether the selection is reasonable
1208 * or a scan is a good idea. For that, we need to have found a
1209 * candidate BSS (which might be the current one), it is up-to-date,
1210 * and we don't want to immediately roam back again.
1211 */
1212 if (pre_scan_check) {
1213 struct os_reltime age;
1214
1215 if (!bss)
1216 return 0;
1217
1218 os_reltime_age(&bss->last_update, &age);
1219 if (age.sec >= 10)
1220 return 0;
1221
1222 #ifndef CONFIG_NO_ROAMING
1223 if (wpa_s->current_bss && bss != wpa_s->current_bss &&
1224 wpa_supplicant_need_to_roam_within_ess(wpa_s,
1225 wpa_s->current_bss,
1226 bss))
1227 return 0;
1228 #endif /* CONFIG_NO_ROAMING */
1229 }
1230
1231 if (!bss) {
1232 wpa_printf(MSG_DEBUG, "WNM: No BSS transition candidate match found");
1233 status = WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES;
1234 goto send_bss_resp_fail;
1235 }
1236
1237 /* Associate to the network */
1238 wnm_bss_tm_connect(wpa_s, bss, ssid, 1);
1239 return 1;
1240
1241 send_bss_resp_fail:
1242 /* Send reject response for all the failures */
1243
1244 if (wpa_s->wnm_reply)
1245 wnm_send_bss_transition_mgmt_resp(wpa_s, status, reason,
1246 0, NULL);
1247
1248 wnm_btm_reset(wpa_s);
1249
1250 return 0;
1251 }
1252
1253
cand_pref_compar(const void * a,const void * b)1254 static int cand_pref_compar(const void *a, const void *b)
1255 {
1256 const struct neighbor_report *aa = a;
1257 const struct neighbor_report *bb = b;
1258
1259 if (aa->disassoc_imminent && !bb->disassoc_imminent)
1260 return 1;
1261 if (bb->disassoc_imminent && !aa->disassoc_imminent)
1262 return -1;
1263
1264 if (!aa->preference_present && !bb->preference_present)
1265 return 0;
1266 if (!aa->preference_present)
1267 return 1;
1268 if (!bb->preference_present)
1269 return -1;
1270 if (bb->preference > aa->preference)
1271 return 1;
1272 if (bb->preference < aa->preference)
1273 return -1;
1274 return 0;
1275 }
1276
1277
wnm_sort_cand_list(struct wpa_supplicant * wpa_s)1278 static void wnm_sort_cand_list(struct wpa_supplicant *wpa_s)
1279 {
1280 if (!wpa_s->wnm_neighbor_report_elements)
1281 return;
1282 qsort(wpa_s->wnm_neighbor_report_elements,
1283 wpa_s->wnm_num_neighbor_report, sizeof(struct neighbor_report),
1284 cand_pref_compar);
1285 }
1286
1287
wnm_dump_cand_list(struct wpa_supplicant * wpa_s)1288 static void wnm_dump_cand_list(struct wpa_supplicant *wpa_s)
1289 {
1290 unsigned int i;
1291
1292 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Candidate List");
1293 if (!wpa_s->wnm_neighbor_report_elements)
1294 return;
1295 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
1296 struct neighbor_report *nei;
1297
1298 nei = &wpa_s->wnm_neighbor_report_elements[i];
1299 wpa_printf(MSG_DEBUG, "%u: " MACSTR
1300 " info=0x%x op_class=%u chan=%u phy=%u pref=%d freq=%d",
1301 i, MAC2STR(nei->bssid), nei->bssid_info,
1302 nei->regulatory_class,
1303 nei->channel_number, nei->phy_type,
1304 nei->preference_present ? nei->preference : -1,
1305 nei->freq);
1306 }
1307 }
1308
1309
chan_supported(struct wpa_supplicant * wpa_s,int freq)1310 static int chan_supported(struct wpa_supplicant *wpa_s, int freq)
1311 {
1312 unsigned int i;
1313
1314 for (i = 0; i < wpa_s->hw.num_modes; i++) {
1315 struct hostapd_hw_modes *mode = &wpa_s->hw.modes[i];
1316 int j;
1317
1318 for (j = 0; j < mode->num_channels; j++) {
1319 struct hostapd_channel_data *chan;
1320
1321 chan = &mode->channels[j];
1322 if (chan->freq == freq &&
1323 !(chan->flag & HOSTAPD_CHAN_DISABLED))
1324 return 1;
1325 }
1326 }
1327
1328 return 0;
1329 }
1330
1331
wnm_set_scan_freqs(struct wpa_supplicant * wpa_s)1332 static void wnm_set_scan_freqs(struct wpa_supplicant *wpa_s)
1333 {
1334 int *freqs;
1335 int num_freqs = 0;
1336 unsigned int i;
1337
1338 if (!wpa_s->wnm_neighbor_report_elements)
1339 return;
1340
1341 if (wpa_s->hw.modes == NULL)
1342 return;
1343
1344 os_free(wpa_s->next_scan_freqs);
1345 wpa_s->next_scan_freqs = NULL;
1346
1347 freqs = os_calloc(wpa_s->wnm_num_neighbor_report + 1, sizeof(int));
1348 if (freqs == NULL)
1349 return;
1350
1351 for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
1352 struct neighbor_report *nei;
1353
1354 nei = &wpa_s->wnm_neighbor_report_elements[i];
1355
1356 if (nei->preference_present && nei->preference == 0)
1357 continue;
1358
1359 if (nei->freq <= 0) {
1360 wpa_printf(MSG_DEBUG,
1361 "WNM: Unknown neighbor operating frequency for "
1362 MACSTR " - scan all channels",
1363 MAC2STR(nei->bssid));
1364 os_free(freqs);
1365 return;
1366 }
1367 if (chan_supported(wpa_s, nei->freq))
1368 add_freq(freqs, &num_freqs, nei->freq);
1369 }
1370
1371 if (num_freqs == 0) {
1372 os_free(freqs);
1373 return;
1374 }
1375
1376 wpa_printf(MSG_DEBUG,
1377 "WNM: Scan %d frequencies based on transition candidate list",
1378 num_freqs);
1379 wpa_s->next_scan_freqs = freqs;
1380 }
1381
1382
ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant * wpa_s,const u8 * pos,const u8 * end,int reply)1383 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
1384 const u8 *pos, const u8 *end,
1385 int reply)
1386 {
1387 unsigned int beacon_int;
1388 u8 valid_int;
1389 #ifdef CONFIG_MBO
1390 const u8 *vendor;
1391 #endif /* CONFIG_MBO */
1392 bool disassoc_imminent;
1393
1394 if (wpa_s->disable_mbo_oce || wpa_s->conf->disable_btm)
1395 return;
1396
1397 if (end - pos < 5)
1398 return;
1399
1400 if (wpa_s->current_bss)
1401 beacon_int = wpa_s->current_bss->beacon_int;
1402 else
1403 beacon_int = 100; /* best guess */
1404
1405 wnm_btm_reset(wpa_s);
1406
1407 wpa_s->wnm_dialog_token = pos[0];
1408 wpa_s->wnm_mode = pos[1];
1409 wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
1410 wpa_s->wnm_link_removal = false;
1411 valid_int = pos[4];
1412 wpa_s->wnm_reply = reply;
1413
1414 wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
1415 "dialog_token=%u request_mode=0x%x "
1416 "disassoc_timer=%u validity_interval=%u",
1417 wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
1418 wpa_s->wnm_dissoc_timer, valid_int);
1419
1420 #if defined(CONFIG_MBO) && defined(CONFIG_TESTING_OPTIONS)
1421 if (wpa_s->reject_btm_req_reason) {
1422 wpa_printf(MSG_INFO,
1423 "WNM: Testing - reject BSS Transition Management Request: reject_btm_req_reason=%d",
1424 wpa_s->reject_btm_req_reason);
1425 wnm_send_bss_transition_mgmt_resp(
1426 wpa_s, wpa_s->reject_btm_req_reason,
1427 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0, NULL);
1428 return;
1429 }
1430 #endif /* CONFIG_MBO && CONFIG_TESTING_OPTIONS */
1431
1432 pos += 5;
1433
1434 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
1435 if (end - pos < 12) {
1436 wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
1437 return;
1438 }
1439 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
1440 pos += 12; /* BSS Termination Duration */
1441 }
1442
1443 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
1444 char url[256];
1445 u8 url_len;
1446
1447 if (end - pos < 1) {
1448 wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
1449 "Management Request (URL)");
1450 return;
1451 }
1452 url_len = *pos++;
1453 if (url_len > end - pos) {
1454 wpa_printf(MSG_DEBUG,
1455 "WNM: Invalid BSS Transition Management Request (URL truncated)");
1456 return;
1457 }
1458 os_memcpy(url, pos, url_len);
1459 url[url_len] = '\0';
1460 pos += url_len;
1461
1462 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
1463 wpa_sm_pmf_enabled(wpa_s->wpa),
1464 wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
1465 }
1466
1467 disassoc_imminent = wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT;
1468
1469 /*
1470 * Based on IEEE P802.11be/D5.0, when a station is a non-AP MLD with
1471 * more than one affiliated link, the Link Removal Imminent field is
1472 * set to 1, and the BSS Termination Included field is set to 1, only
1473 * one of the links is removed and the other links remain associated.
1474 * Ignore the Disassociation Imminent field in such a case.
1475 *
1476 * TODO: We should check if the AP has more than one link.
1477 * TODO: We should pass the RX link and use that
1478 */
1479 if (disassoc_imminent && wpa_s->valid_links &&
1480 (wpa_s->wnm_mode & WNM_BSS_TM_REQ_LINK_REMOVAL_IMMINENT) &&
1481 (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED)) {
1482 /* If we still have a link, then just accept the request */
1483 if (wpa_s->valid_links & (wpa_s->valid_links - 1)) {
1484 wpa_printf(MSG_INFO,
1485 "WNM: BTM request for a single MLO link - ignore disassociation imminent since other links remain associated");
1486 disassoc_imminent = false;
1487
1488 wnm_send_bss_transition_mgmt_resp(
1489 wpa_s, WNM_BSS_TM_ACCEPT, 0, 0, NULL);
1490
1491 return;
1492 }
1493
1494 /* The last link is being removed (which must be the assoc link)
1495 */
1496 wpa_s->wnm_link_removal = true;
1497 os_memcpy(wpa_s->wnm_dissoc_addr,
1498 wpa_s->links[wpa_s->mlo_assoc_link_id].bssid,
1499 ETH_ALEN);
1500 } else {
1501 os_memcpy(wpa_s->wnm_dissoc_addr, wpa_s->valid_links ?
1502 wpa_s->ap_mld_addr : wpa_s->bssid, ETH_ALEN);
1503 }
1504
1505 if (disassoc_imminent) {
1506 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
1507 "Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
1508 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning &&
1509 (!wpa_s->current_ssid || !wpa_s->current_ssid->bssid_set)) {
1510 wpa_printf(MSG_DEBUG, "Trying to find another BSS");
1511 wpa_supplicant_req_scan(wpa_s, 0, 0);
1512 }
1513 }
1514
1515 #ifdef CONFIG_MBO
1516 vendor = get_ie(pos, end - pos, WLAN_EID_VENDOR_SPECIFIC);
1517 if (vendor)
1518 wpas_mbo_ie_trans_req(wpa_s, vendor + 2, vendor[1]);
1519 #endif /* CONFIG_MBO */
1520
1521 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
1522 unsigned int valid_ms;
1523
1524 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
1525 wpa_s->wnm_neighbor_report_elements = os_calloc(
1526 WNM_MAX_NEIGHBOR_REPORT,
1527 sizeof(struct neighbor_report));
1528 if (wpa_s->wnm_neighbor_report_elements == NULL)
1529 return;
1530
1531 while (end - pos >= 2 &&
1532 wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
1533 {
1534 u8 tag = *pos++;
1535 u8 len = *pos++;
1536
1537 wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
1538 tag);
1539 if (len > end - pos) {
1540 wpa_printf(MSG_DEBUG, "WNM: Truncated request");
1541 return;
1542 }
1543 if (tag == WLAN_EID_NEIGHBOR_REPORT) {
1544 struct neighbor_report *rep;
1545 rep = &wpa_s->wnm_neighbor_report_elements[
1546 wpa_s->wnm_num_neighbor_report];
1547 wnm_parse_neighbor_report(wpa_s, pos, len, rep);
1548 if ((wpa_s->wnm_mode &
1549 WNM_BSS_TM_REQ_DISASSOC_IMMINENT) &&
1550 ether_addr_equal(rep->bssid, wpa_s->bssid))
1551 rep->disassoc_imminent = 1;
1552
1553 wpa_s->wnm_num_neighbor_report++;
1554 #ifdef CONFIG_MBO
1555 if (wpa_s->wnm_mbo_trans_reason_present &&
1556 wpa_s->wnm_num_neighbor_report == 1) {
1557 rep->is_first = 1;
1558 wpa_printf(MSG_DEBUG,
1559 "WNM: First transition candidate is "
1560 MACSTR, MAC2STR(rep->bssid));
1561 }
1562 #endif /* CONFIG_MBO */
1563 }
1564
1565 pos += len;
1566 }
1567
1568 if (!wpa_s->wnm_num_neighbor_report) {
1569 wpa_printf(MSG_DEBUG,
1570 "WNM: Candidate list included bit is set, but no candidates found");
1571 wnm_send_bss_transition_mgmt_resp(
1572 wpa_s, WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES,
1573 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
1574 NULL);
1575 return;
1576 }
1577
1578 if (wpa_s->current_ssid && wpa_s->current_ssid->bssid_set) {
1579 wpa_printf(MSG_DEBUG,
1580 "WNM: Configuration prevents roaming (BSSID set)");
1581 wnm_send_bss_transition_mgmt_resp(
1582 wpa_s, WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES,
1583 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0,
1584 NULL);
1585 return;
1586 }
1587
1588 wnm_sort_cand_list(wpa_s);
1589 wnm_dump_cand_list(wpa_s);
1590 valid_ms = valid_int * beacon_int * 128 / 125;
1591 wpa_printf(MSG_DEBUG, "WNM: Candidate list valid for %u ms",
1592 valid_ms);
1593 os_get_reltime(&wpa_s->wnm_cand_valid_until);
1594 wpa_s->wnm_cand_valid_until.sec += valid_ms / 1000;
1595 wpa_s->wnm_cand_valid_until.usec += (valid_ms % 1000) * 1000;
1596 wpa_s->wnm_cand_valid_until.sec +=
1597 wpa_s->wnm_cand_valid_until.usec / 1000000;
1598 wpa_s->wnm_cand_valid_until.usec %= 1000000;
1599
1600 /*
1601 * Try fetching the latest scan results from the kernel.
1602 * This can help in finding more up-to-date information should
1603 * the driver have done some internal scanning operations after
1604 * the last scan result update in wpa_supplicant.
1605 *
1606 * It is not a new scan, this does not update the last_scan
1607 * timestamp nor will it expire old BSSs.
1608 */
1609 wpa_supplicant_update_scan_results(wpa_s, NULL);
1610 if (wnm_scan_process(wpa_s, true) > 0)
1611 return;
1612 wpa_printf(MSG_DEBUG,
1613 "WNM: No valid match in previous scan results - try a new scan");
1614
1615 wnm_set_scan_freqs(wpa_s);
1616 if (wpa_s->wnm_num_neighbor_report == 1) {
1617 os_memcpy(wpa_s->next_scan_bssid,
1618 wpa_s->wnm_neighbor_report_elements[0].bssid,
1619 ETH_ALEN);
1620 wpa_printf(MSG_DEBUG,
1621 "WNM: Scan only for a specific BSSID since there is only a single candidate "
1622 MACSTR, MAC2STR(wpa_s->next_scan_bssid));
1623 }
1624 wpa_supplicant_req_scan(wpa_s, 0, 0);
1625 } else if (reply) {
1626 enum bss_trans_mgmt_status_code status;
1627
1628 if ((wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) ||
1629 wpa_s->wnm_link_removal)
1630 status = WNM_BSS_TM_ACCEPT;
1631 else {
1632 wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates");
1633 status = WNM_BSS_TM_REJECT_UNSPECIFIED;
1634 }
1635 wnm_send_bss_transition_mgmt_resp(
1636 wpa_s, status,
1637 MBO_TRANSITION_REJECT_REASON_UNSPECIFIED, 0, NULL);
1638 }
1639 }
1640
1641
wnm_btm_resp_tx_status(struct wpa_supplicant * wpa_s,const u8 * data,size_t data_len)1642 int wnm_btm_resp_tx_status(struct wpa_supplicant *wpa_s, const u8 *data,
1643 size_t data_len)
1644 {
1645 const struct ieee80211_mgmt *frame =
1646 (const struct ieee80211_mgmt *) data;
1647
1648 if (data_len <
1649 IEEE80211_HDRLEN + sizeof(frame->u.action.u.bss_tm_resp) ||
1650 frame->u.action.category != WLAN_ACTION_WNM ||
1651 frame->u.action.u.bss_tm_resp.action != WNM_BSS_TRANS_MGMT_RESP ||
1652 frame->u.action.u.bss_tm_resp.status_code != WNM_BSS_TM_ACCEPT)
1653 return -1;
1654
1655 /*
1656 * If disassoc imminent bit was set in the request, the response may
1657 * indicate accept even if no candidate was found, so bail out here.
1658 */
1659 if (!wpa_s->wnm_target_bss) {
1660 wpa_printf(MSG_DEBUG, "WNM: Target BSS is not set");
1661 return 0;
1662 }
1663
1664 if (!wpa_s->current_ssid)
1665 return 0;
1666
1667 wnm_bss_tm_connect(wpa_s, wpa_s->wnm_target_bss, wpa_s->current_ssid,
1668 0);
1669
1670 wpa_s->wnm_target_bss = NULL;
1671 return 0;
1672 }
1673
1674
1675 #define BTM_QUERY_MIN_SIZE 4
1676
wnm_send_bss_transition_mgmt_query(struct wpa_supplicant * wpa_s,u8 query_reason,const char * btm_candidates,int cand_list)1677 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
1678 u8 query_reason,
1679 const char *btm_candidates,
1680 int cand_list)
1681 {
1682 struct wpabuf *buf;
1683 int ret;
1684
1685 wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
1686 MACSTR " query_reason=%u%s",
1687 MAC2STR(wpa_s->bssid), query_reason,
1688 cand_list ? " candidate list" : "");
1689
1690 buf = wpabuf_alloc(BTM_QUERY_MIN_SIZE);
1691 if (!buf)
1692 return -1;
1693
1694 wpabuf_put_u8(buf, WLAN_ACTION_WNM);
1695 wpabuf_put_u8(buf, WNM_BSS_TRANS_MGMT_QUERY);
1696 wpabuf_put_u8(buf, 1);
1697 wpabuf_put_u8(buf, query_reason);
1698
1699 if (cand_list)
1700 wnm_add_cand_list(wpa_s, &buf);
1701
1702 if (btm_candidates) {
1703 const size_t max_len = 1000;
1704
1705 ret = wpabuf_resize(&buf, max_len);
1706 if (ret < 0) {
1707 wpabuf_free(buf);
1708 return ret;
1709 }
1710
1711 ret = ieee802_11_parse_candidate_list(btm_candidates,
1712 wpabuf_put(buf, 0),
1713 max_len);
1714 if (ret < 0) {
1715 wpabuf_free(buf);
1716 return ret;
1717 }
1718
1719 wpabuf_put(buf, ret);
1720 }
1721
1722 ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
1723 wpa_s->own_addr, wpa_s->bssid,
1724 wpabuf_head_u8(buf), wpabuf_len(buf), 0);
1725
1726 wpabuf_free(buf);
1727 return ret;
1728 }
1729
1730
ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant * wpa_s,const u8 * sa,const u8 * data,int len)1731 static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s,
1732 const u8 *sa, const u8 *data,
1733 int len)
1734 {
1735 const u8 *pos, *end, *next;
1736 u8 ie, ie_len;
1737
1738 pos = data;
1739 end = data + len;
1740
1741 while (end - pos > 1) {
1742 ie = *pos++;
1743 ie_len = *pos++;
1744 wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u",
1745 ie, ie_len);
1746 if (ie_len > end - pos) {
1747 wpa_printf(MSG_DEBUG, "WNM: Not enough room for "
1748 "subelement");
1749 break;
1750 }
1751 next = pos + ie_len;
1752 if (ie_len < 4) {
1753 pos = next;
1754 continue;
1755 }
1756 wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u",
1757 WPA_GET_BE24(pos), pos[3]);
1758
1759 #ifdef CONFIG_HS20
1760 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
1761 WPA_GET_BE24(pos) == OUI_WFA &&
1762 pos[3] == HS20_WNM_SUB_REM_NEEDED) {
1763 /* Subscription Remediation subelement */
1764 const u8 *ie_end;
1765 u8 url_len;
1766 char *url;
1767 u8 osu_method;
1768
1769 wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation "
1770 "subelement");
1771 ie_end = pos + ie_len;
1772 pos += 4;
1773 url_len = *pos++;
1774 if (url_len == 0) {
1775 wpa_printf(MSG_DEBUG, "WNM: No Server URL included");
1776 url = NULL;
1777 osu_method = 1;
1778 } else {
1779 if (url_len + 1 > ie_end - pos) {
1780 wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)",
1781 url_len,
1782 (int) (ie_end - pos));
1783 break;
1784 }
1785 url = os_malloc(url_len + 1);
1786 if (url == NULL)
1787 break;
1788 os_memcpy(url, pos, url_len);
1789 url[url_len] = '\0';
1790 osu_method = pos[url_len];
1791 }
1792 hs20_rx_subscription_remediation(wpa_s, url,
1793 osu_method);
1794 os_free(url);
1795 pos = next;
1796 continue;
1797 }
1798
1799 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 &&
1800 WPA_GET_BE24(pos) == OUI_WFA &&
1801 pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) {
1802 const u8 *ie_end;
1803 u8 url_len;
1804 char *url;
1805 u8 code;
1806 u16 reauth_delay;
1807
1808 ie_end = pos + ie_len;
1809 pos += 4;
1810 code = *pos++;
1811 reauth_delay = WPA_GET_LE16(pos);
1812 pos += 2;
1813 url_len = *pos++;
1814 wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication "
1815 "Imminent - Reason Code %u "
1816 "Re-Auth Delay %u URL Length %u",
1817 code, reauth_delay, url_len);
1818 if (url_len > ie_end - pos)
1819 break;
1820 url = os_malloc(url_len + 1);
1821 if (url == NULL)
1822 break;
1823 os_memcpy(url, pos, url_len);
1824 url[url_len] = '\0';
1825 hs20_rx_deauth_imminent_notice(wpa_s, code,
1826 reauth_delay, url);
1827 os_free(url);
1828 pos = next;
1829 continue;
1830 }
1831
1832 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
1833 WPA_GET_BE24(pos) == OUI_WFA &&
1834 pos[3] == HS20_WNM_T_C_ACCEPTANCE) {
1835 const u8 *ie_end;
1836 u8 url_len;
1837 char *url;
1838
1839 ie_end = pos + ie_len;
1840 pos += 4;
1841 url_len = *pos++;
1842 wpa_printf(MSG_DEBUG,
1843 "WNM: HS 2.0 Terms and Conditions Acceptance (URL Length %u)",
1844 url_len);
1845 if (url_len > ie_end - pos)
1846 break;
1847 url = os_malloc(url_len + 1);
1848 if (!url)
1849 break;
1850 os_memcpy(url, pos, url_len);
1851 url[url_len] = '\0';
1852 hs20_rx_t_c_acceptance(wpa_s, url);
1853 os_free(url);
1854 pos = next;
1855 continue;
1856 }
1857 #endif /* CONFIG_HS20 */
1858
1859 pos = next;
1860 }
1861 }
1862
1863
ieee802_11_rx_wnm_notif_req(struct wpa_supplicant * wpa_s,const u8 * sa,const u8 * frm,int len)1864 static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s,
1865 const u8 *sa, const u8 *frm, int len)
1866 {
1867 const u8 *pos, *end;
1868 u8 dialog_token, type;
1869
1870 /* Dialog Token [1] | Type [1] | Subelements */
1871
1872 if (len < 2 || sa == NULL)
1873 return;
1874 end = frm + len;
1875 pos = frm;
1876 dialog_token = *pos++;
1877 type = *pos++;
1878
1879 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request "
1880 "(dialog_token %u type %u sa " MACSTR ")",
1881 dialog_token, type, MAC2STR(sa));
1882 wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements",
1883 pos, end - pos);
1884
1885 if (wpa_s->wpa_state != WPA_COMPLETED ||
1886 (!ether_addr_equal(sa, wpa_s->bssid) &&
1887 (!wpa_s->valid_links ||
1888 !ether_addr_equal(sa, wpa_s->ap_mld_addr)))) {
1889 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not "
1890 "from our AP - ignore it");
1891 return;
1892 }
1893
1894 switch (type) {
1895 case 1:
1896 ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos);
1897 break;
1898 default:
1899 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown "
1900 "WNM-Notification type %u", type);
1901 break;
1902 }
1903 }
1904
1905
ieee802_11_rx_wnm_coloc_intf_req(struct wpa_supplicant * wpa_s,const u8 * sa,const u8 * frm,int len)1906 static void ieee802_11_rx_wnm_coloc_intf_req(struct wpa_supplicant *wpa_s,
1907 const u8 *sa, const u8 *frm,
1908 int len)
1909 {
1910 u8 dialog_token, req_info, auto_report, timeout;
1911
1912 if (!wpa_s->conf->coloc_intf_reporting)
1913 return;
1914
1915 /* Dialog Token [1] | Request Info [1] */
1916
1917 if (len < 2)
1918 return;
1919 dialog_token = frm[0];
1920 req_info = frm[1];
1921 auto_report = req_info & 0x03;
1922 timeout = req_info >> 2;
1923
1924 wpa_dbg(wpa_s, MSG_DEBUG,
1925 "WNM: Received Collocated Interference Request (dialog_token %u auto_report %u timeout %u sa " MACSTR ")",
1926 dialog_token, auto_report, timeout, MAC2STR(sa));
1927
1928 if (dialog_token == 0)
1929 return; /* only nonzero values are used for request */
1930
1931 if (wpa_s->wpa_state != WPA_COMPLETED ||
1932 (!ether_addr_equal(sa, wpa_s->bssid) &&
1933 (!wpa_s->valid_links ||
1934 !ether_addr_equal(sa, wpa_s->ap_mld_addr)))) {
1935 wpa_dbg(wpa_s, MSG_DEBUG,
1936 "WNM: Collocated Interference Request frame not from current AP - ignore it");
1937 return;
1938 }
1939
1940 wpa_msg(wpa_s, MSG_INFO, COLOC_INTF_REQ "%u %u %u",
1941 dialog_token, auto_report, timeout);
1942 wpa_s->coloc_intf_dialog_token = dialog_token;
1943 wpa_s->coloc_intf_auto_report = auto_report;
1944 wpa_s->coloc_intf_timeout = timeout;
1945 }
1946
1947
ieee802_11_rx_wnm_action(struct wpa_supplicant * wpa_s,const struct ieee80211_mgmt * mgmt,size_t len)1948 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
1949 const struct ieee80211_mgmt *mgmt, size_t len)
1950 {
1951 const u8 *pos, *end;
1952 u8 act;
1953
1954 if (len < IEEE80211_HDRLEN + 2)
1955 return;
1956
1957 pos = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 1;
1958 act = *pos++;
1959 end = ((const u8 *) mgmt) + len;
1960
1961 wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
1962 act, MAC2STR(mgmt->sa));
1963 if (wpa_s->wpa_state < WPA_ASSOCIATED ||
1964 (!ether_addr_equal(mgmt->sa, wpa_s->bssid) &&
1965 (!wpa_s->valid_links ||
1966 !ether_addr_equal(mgmt->sa, wpa_s->ap_mld_addr)))) {
1967 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
1968 "frame");
1969 return;
1970 }
1971
1972 switch (act) {
1973 case WNM_BSS_TRANS_MGMT_REQ:
1974 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
1975 !(mgmt->da[0] & 0x01));
1976 break;
1977 case WNM_SLEEP_MODE_RESP:
1978 ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos);
1979 break;
1980 case WNM_NOTIFICATION_REQ:
1981 ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos);
1982 break;
1983 case WNM_COLLOCATED_INTERFERENCE_REQ:
1984 ieee802_11_rx_wnm_coloc_intf_req(wpa_s, mgmt->sa, pos,
1985 end - pos);
1986 break;
1987 default:
1988 wpa_printf(MSG_ERROR, "WNM: Unknown request");
1989 break;
1990 }
1991 }
1992
1993
wnm_send_coloc_intf_report(struct wpa_supplicant * wpa_s,u8 dialog_token,const struct wpabuf * elems)1994 int wnm_send_coloc_intf_report(struct wpa_supplicant *wpa_s, u8 dialog_token,
1995 const struct wpabuf *elems)
1996 {
1997 struct wpabuf *buf;
1998 int ret;
1999
2000 if (wpa_s->wpa_state < WPA_ASSOCIATED || !elems)
2001 return -1;
2002
2003 wpa_printf(MSG_DEBUG, "WNM: Send Collocated Interference Report to "
2004 MACSTR " (dialog token %u)",
2005 MAC2STR(wpa_s->bssid), dialog_token);
2006
2007 buf = wpabuf_alloc(3 + wpabuf_len(elems));
2008 if (!buf)
2009 return -1;
2010
2011 wpabuf_put_u8(buf, WLAN_ACTION_WNM);
2012 wpabuf_put_u8(buf, WNM_COLLOCATED_INTERFERENCE_REPORT);
2013 wpabuf_put_u8(buf, dialog_token);
2014 wpabuf_put_buf(buf, elems);
2015
2016 ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
2017 wpa_s->own_addr, wpa_s->bssid,
2018 wpabuf_head_u8(buf), wpabuf_len(buf), 0);
2019 wpabuf_free(buf);
2020 return ret;
2021 }
2022
2023
wnm_set_coloc_intf_elems(struct wpa_supplicant * wpa_s,struct wpabuf * elems)2024 void wnm_set_coloc_intf_elems(struct wpa_supplicant *wpa_s,
2025 struct wpabuf *elems)
2026 {
2027 if (elems && wpabuf_len(elems) == 0) {
2028 wpabuf_free(elems);
2029 elems = NULL;
2030 }
2031
2032 /* NOTE: The elements are not stored as they are only send out once */
2033
2034 if (wpa_s->conf->coloc_intf_reporting && elems &&
2035 wpa_s->coloc_intf_dialog_token &&
2036 (wpa_s->coloc_intf_auto_report == 1 ||
2037 wpa_s->coloc_intf_auto_report == 3)) {
2038 /* TODO: Check that there has not been less than
2039 * wpa_s->coloc_intf_timeout * 200 TU from the last report.
2040 */
2041 wnm_send_coloc_intf_report(wpa_s,
2042 wpa_s->coloc_intf_dialog_token,
2043 elems);
2044 }
2045
2046 wpabuf_free(elems);
2047 }
2048
2049
wnm_clear_coloc_intf_reporting(struct wpa_supplicant * wpa_s)2050 void wnm_clear_coloc_intf_reporting(struct wpa_supplicant *wpa_s)
2051 {
2052 wpa_s->coloc_intf_dialog_token = 0;
2053 wpa_s->coloc_intf_auto_report = 0;
2054 }
2055
2056
wnm_is_bss_excluded(struct wpa_supplicant * wpa_s,struct wpa_bss * bss)2057 bool wnm_is_bss_excluded(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
2058 {
2059 if (!(wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT))
2060 return false;
2061
2062 /*
2063 * In case disassociation imminent is set, do no try to use a BSS to
2064 * which we are connected.
2065 */
2066 if (wpa_s->wnm_link_removal ||
2067 !(wpa_s->drv_flags2 & WPA_DRIVER_FLAGS2_MLO) ||
2068 is_zero_ether_addr(bss->mld_addr)) {
2069 if (ether_addr_equal(bss->bssid, wpa_s->wnm_dissoc_addr))
2070 return true;
2071 } else {
2072 if (ether_addr_equal(bss->mld_addr, wpa_s->wnm_dissoc_addr))
2073 return true;
2074 }
2075
2076 return false;
2077 }
2078
