1 /*
2 * WPA Supplicant - Basic mesh peer management
3 * Copyright (c) 2013-2014, cozybit, Inc. All rights reserved.
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 "utils/eloop.h"
13 #include "common/ieee802_11_defs.h"
14 #include "common/hw_features_common.h"
15 #include "ap/hostapd.h"
16 #include "ap/sta_info.h"
17 #include "ap/ieee802_11.h"
18 #include "ap/wpa_auth.h"
19 #include "wpa_supplicant_i.h"
20 #include "driver_i.h"
21 #include "mesh_mpm.h"
22 #include "mesh_rsn.h"
23 #include "notify.h"
24
25 struct mesh_peer_mgmt_ie {
26 const u8 *proto_id; /* Mesh Peering Protocol Identifier (2 octets) */
27 const u8 *llid; /* Local Link ID (2 octets) */
28 const u8 *plid; /* Peer Link ID (conditional, 2 octets) */
29 const u8 *reason; /* Reason Code (conditional, 2 octets) */
30 const u8 *chosen_pmk; /* Chosen PMK (optional, 16 octets) */
31 };
32
33 static void plink_timer(void *eloop_ctx, void *user_data);
34
35
36 enum plink_event {
37 PLINK_UNDEFINED,
38 OPN_ACPT,
39 OPN_RJCT,
40 CNF_ACPT,
41 CNF_RJCT,
42 CLS_ACPT,
43 REQ_RJCT
44 };
45
46 static const char * const mplstate[] = {
47 [0] = "UNINITIALIZED",
48 [PLINK_IDLE] = "IDLE",
49 [PLINK_OPN_SNT] = "OPN_SNT",
50 [PLINK_OPN_RCVD] = "OPN_RCVD",
51 [PLINK_CNF_RCVD] = "CNF_RCVD",
52 [PLINK_ESTAB] = "ESTAB",
53 [PLINK_HOLDING] = "HOLDING",
54 [PLINK_BLOCKED] = "BLOCKED"
55 };
56
57 static const char * const mplevent[] = {
58 [PLINK_UNDEFINED] = "UNDEFINED",
59 [OPN_ACPT] = "OPN_ACPT",
60 [OPN_RJCT] = "OPN_RJCT",
61 [CNF_ACPT] = "CNF_ACPT",
62 [CNF_RJCT] = "CNF_RJCT",
63 [CLS_ACPT] = "CLS_ACPT",
64 [REQ_RJCT] = "REQ_RJCT",
65 };
66
67
mesh_mpm_parse_peer_mgmt(struct wpa_supplicant * wpa_s,u8 action_field,const u8 * ie,size_t len,struct mesh_peer_mgmt_ie * mpm_ie)68 static int mesh_mpm_parse_peer_mgmt(struct wpa_supplicant *wpa_s,
69 u8 action_field,
70 const u8 *ie, size_t len,
71 struct mesh_peer_mgmt_ie *mpm_ie)
72 {
73 os_memset(mpm_ie, 0, sizeof(*mpm_ie));
74
75 /* Remove optional Chosen PMK field at end */
76 if (len >= SAE_PMKID_LEN) {
77 mpm_ie->chosen_pmk = ie + len - SAE_PMKID_LEN;
78 len -= SAE_PMKID_LEN;
79 }
80
81 if ((action_field == PLINK_OPEN && len != 4) ||
82 (action_field == PLINK_CONFIRM && len != 6) ||
83 (action_field == PLINK_CLOSE && len != 6 && len != 8)) {
84 wpa_msg(wpa_s, MSG_DEBUG, "MPM: Invalid peer mgmt ie");
85 return -1;
86 }
87
88 /* required fields */
89 if (len < 4)
90 return -1;
91 mpm_ie->proto_id = ie;
92 mpm_ie->llid = ie + 2;
93 ie += 4;
94 len -= 4;
95
96 /* close reason is always present at end for close */
97 if (action_field == PLINK_CLOSE) {
98 if (len < 2)
99 return -1;
100 mpm_ie->reason = ie + len - 2;
101 len -= 2;
102 }
103
104 /* Peer Link ID, present for confirm, and possibly close */
105 if (len >= 2)
106 mpm_ie->plid = ie;
107
108 return 0;
109 }
110
111
plink_free_count(struct hostapd_data * hapd)112 static int plink_free_count(struct hostapd_data *hapd)
113 {
114 if (hapd->max_plinks > hapd->num_plinks)
115 return hapd->max_plinks - hapd->num_plinks;
116 return 0;
117 }
118
119
copy_supp_rates(struct wpa_supplicant * wpa_s,struct sta_info * sta,struct ieee802_11_elems * elems)120 static u16 copy_supp_rates(struct wpa_supplicant *wpa_s,
121 struct sta_info *sta,
122 struct ieee802_11_elems *elems)
123 {
124 if (!elems->supp_rates) {
125 wpa_msg(wpa_s, MSG_ERROR, "no supported rates from " MACSTR,
126 MAC2STR(sta->addr));
127 return WLAN_STATUS_UNSPECIFIED_FAILURE;
128 }
129
130 if (elems->supp_rates_len + elems->ext_supp_rates_len >
131 sizeof(sta->supported_rates)) {
132 wpa_msg(wpa_s, MSG_ERROR,
133 "Invalid supported rates element length " MACSTR
134 " %d+%d", MAC2STR(sta->addr), elems->supp_rates_len,
135 elems->ext_supp_rates_len);
136 return WLAN_STATUS_UNSPECIFIED_FAILURE;
137 }
138
139 sta->supported_rates_len = merge_byte_arrays(
140 sta->supported_rates, sizeof(sta->supported_rates),
141 elems->supp_rates, elems->supp_rates_len,
142 elems->ext_supp_rates, elems->ext_supp_rates_len);
143
144 return WLAN_STATUS_SUCCESS;
145 }
146
147
148 /* return true if elems from a neighbor match this MBSS */
matches_local(struct wpa_supplicant * wpa_s,struct ieee802_11_elems * elems)149 static Boolean matches_local(struct wpa_supplicant *wpa_s,
150 struct ieee802_11_elems *elems)
151 {
152 struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
153
154 if (elems->mesh_config_len < 5)
155 return FALSE;
156
157 return (mconf->meshid_len == elems->mesh_id_len &&
158 os_memcmp(mconf->meshid, elems->mesh_id,
159 elems->mesh_id_len) == 0 &&
160 mconf->mesh_pp_id == elems->mesh_config[0] &&
161 mconf->mesh_pm_id == elems->mesh_config[1] &&
162 mconf->mesh_cc_id == elems->mesh_config[2] &&
163 mconf->mesh_sp_id == elems->mesh_config[3] &&
164 mconf->mesh_auth_id == elems->mesh_config[4]);
165 }
166
167
168 /* check if local link id is already used with another peer */
llid_in_use(struct wpa_supplicant * wpa_s,u16 llid)169 static Boolean llid_in_use(struct wpa_supplicant *wpa_s, u16 llid)
170 {
171 struct sta_info *sta;
172 struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
173
174 for (sta = hapd->sta_list; sta; sta = sta->next) {
175 if (sta->my_lid == llid)
176 return TRUE;
177 }
178
179 return FALSE;
180 }
181
182
183 /* generate an llid for a link and set to initial state */
mesh_mpm_init_link(struct wpa_supplicant * wpa_s,struct sta_info * sta)184 static void mesh_mpm_init_link(struct wpa_supplicant *wpa_s,
185 struct sta_info *sta)
186 {
187 u16 llid;
188
189 do {
190 if (os_get_random((u8 *) &llid, sizeof(llid)) < 0)
191 continue;
192 } while (!llid || llid_in_use(wpa_s, llid));
193
194 sta->my_lid = llid;
195 sta->peer_lid = 0;
196 sta->peer_aid = 0;
197
198 /*
199 * We do not use wpa_mesh_set_plink_state() here because there is no
200 * entry in kernel yet.
201 */
202 sta->plink_state = PLINK_IDLE;
203 }
204
205
mesh_mpm_send_plink_action(struct wpa_supplicant * wpa_s,struct sta_info * sta,enum plink_action_field type,u16 close_reason)206 static void mesh_mpm_send_plink_action(struct wpa_supplicant *wpa_s,
207 struct sta_info *sta,
208 enum plink_action_field type,
209 u16 close_reason)
210 {
211 struct wpabuf *buf;
212 struct hostapd_iface *ifmsh = wpa_s->ifmsh;
213 struct hostapd_data *bss = ifmsh->bss[0];
214 struct mesh_conf *conf = ifmsh->mconf;
215 u8 supp_rates[2 + 2 + 32];
216 u8 *pos, *cat;
217 u8 ie_len, add_plid = 0;
218 int ret;
219 int ampe = conf->security & MESH_CONF_SEC_AMPE;
220 size_t buf_len;
221
222 if (!sta)
223 return;
224
225 buf_len = 2 + /* capability info */
226 2 + /* AID */
227 2 + 8 + /* supported rates */
228 2 + (32 - 8) +
229 2 + 32 + /* mesh ID */
230 2 + 7 + /* mesh config */
231 2 + 23 + /* peering management */
232 2 + 96 + /* AMPE */
233 2 + 16; /* MIC */
234 #ifdef CONFIG_IEEE80211N
235 if (type != PLINK_CLOSE && wpa_s->mesh_ht_enabled) {
236 buf_len += 2 + 26 + /* HT capabilities */
237 2 + 22; /* HT operation */
238 }
239 #endif /* CONFIG_IEEE80211N */
240 #ifdef CONFIG_IEEE80211AC
241 if (type != PLINK_CLOSE && wpa_s->mesh_vht_enabled) {
242 buf_len += 2 + 12 + /* VHT Capabilities */
243 2 + 5; /* VHT Operation */
244 }
245 #endif /* CONFIG_IEEE80211AC */
246 if (type != PLINK_CLOSE)
247 buf_len += conf->rsn_ie_len; /* RSN IE */
248
249 buf = wpabuf_alloc(buf_len);
250 if (!buf)
251 return;
252
253 cat = wpabuf_mhead_u8(buf);
254 wpabuf_put_u8(buf, WLAN_ACTION_SELF_PROTECTED);
255 wpabuf_put_u8(buf, type);
256
257 if (type != PLINK_CLOSE) {
258 u8 info;
259
260 /* capability info */
261 wpabuf_put_le16(buf, ampe ? IEEE80211_CAP_PRIVACY : 0);
262
263 /* aid */
264 if (type == PLINK_CONFIRM)
265 wpabuf_put_le16(buf, sta->aid);
266
267 /* IE: supp + ext. supp rates */
268 pos = hostapd_eid_supp_rates(bss, supp_rates);
269 pos = hostapd_eid_ext_supp_rates(bss, pos);
270 wpabuf_put_data(buf, supp_rates, pos - supp_rates);
271
272 /* IE: RSN IE */
273 wpabuf_put_data(buf, conf->rsn_ie, conf->rsn_ie_len);
274
275 /* IE: Mesh ID */
276 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
277 wpabuf_put_u8(buf, conf->meshid_len);
278 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
279
280 /* IE: mesh conf */
281 wpabuf_put_u8(buf, WLAN_EID_MESH_CONFIG);
282 wpabuf_put_u8(buf, 7);
283 wpabuf_put_u8(buf, conf->mesh_pp_id);
284 wpabuf_put_u8(buf, conf->mesh_pm_id);
285 wpabuf_put_u8(buf, conf->mesh_cc_id);
286 wpabuf_put_u8(buf, conf->mesh_sp_id);
287 wpabuf_put_u8(buf, conf->mesh_auth_id);
288 info = (bss->num_plinks > 63 ? 63 : bss->num_plinks) << 1;
289 /* TODO: Add Connected to Mesh Gate/AS subfields */
290 wpabuf_put_u8(buf, info);
291 /* always forwarding & accepting plinks for now */
292 wpabuf_put_u8(buf, MESH_CAP_ACCEPT_ADDITIONAL_PEER |
293 MESH_CAP_FORWARDING);
294 } else { /* Peer closing frame */
295 /* IE: Mesh ID */
296 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
297 wpabuf_put_u8(buf, conf->meshid_len);
298 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
299 }
300
301 /* IE: Mesh Peering Management element */
302 ie_len = 4;
303 if (ampe)
304 ie_len += PMKID_LEN;
305 switch (type) {
306 case PLINK_OPEN:
307 break;
308 case PLINK_CONFIRM:
309 ie_len += 2;
310 add_plid = 1;
311 break;
312 case PLINK_CLOSE:
313 ie_len += 2;
314 add_plid = 1;
315 ie_len += 2; /* reason code */
316 break;
317 }
318
319 wpabuf_put_u8(buf, WLAN_EID_PEER_MGMT);
320 wpabuf_put_u8(buf, ie_len);
321 /* peering protocol */
322 if (ampe)
323 wpabuf_put_le16(buf, 1);
324 else
325 wpabuf_put_le16(buf, 0);
326 wpabuf_put_le16(buf, sta->my_lid);
327 if (add_plid)
328 wpabuf_put_le16(buf, sta->peer_lid);
329 if (type == PLINK_CLOSE)
330 wpabuf_put_le16(buf, close_reason);
331 if (ampe) {
332 if (sta->sae == NULL) {
333 wpa_msg(wpa_s, MSG_INFO, "Mesh MPM: no SAE session");
334 goto fail;
335 }
336 mesh_rsn_get_pmkid(wpa_s->mesh_rsn, sta,
337 wpabuf_put(buf, PMKID_LEN));
338 }
339
340 #ifdef CONFIG_IEEE80211N
341 if (type != PLINK_CLOSE && wpa_s->mesh_ht_enabled) {
342 u8 ht_capa_oper[2 + 26 + 2 + 22];
343
344 pos = hostapd_eid_ht_capabilities(bss, ht_capa_oper);
345 pos = hostapd_eid_ht_operation(bss, pos);
346 wpabuf_put_data(buf, ht_capa_oper, pos - ht_capa_oper);
347 }
348 #endif /* CONFIG_IEEE80211N */
349 #ifdef CONFIG_IEEE80211AC
350 if (type != PLINK_CLOSE && wpa_s->mesh_vht_enabled) {
351 u8 vht_capa_oper[2 + 12 + 2 + 5];
352
353 pos = hostapd_eid_vht_capabilities(bss, vht_capa_oper, 0);
354 pos = hostapd_eid_vht_operation(bss, pos);
355 wpabuf_put_data(buf, vht_capa_oper, pos - vht_capa_oper);
356 }
357 #endif /* CONFIG_IEEE80211AC */
358
359 if (ampe && mesh_rsn_protect_frame(wpa_s->mesh_rsn, sta, cat, buf)) {
360 wpa_msg(wpa_s, MSG_INFO,
361 "Mesh MPM: failed to add AMPE and MIC IE");
362 goto fail;
363 }
364
365 wpa_msg(wpa_s, MSG_DEBUG, "Mesh MPM: Sending peering frame type %d to "
366 MACSTR " (my_lid=0x%x peer_lid=0x%x)",
367 type, MAC2STR(sta->addr), sta->my_lid, sta->peer_lid);
368 ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0,
369 sta->addr, wpa_s->own_addr, wpa_s->own_addr,
370 wpabuf_head(buf), wpabuf_len(buf), 0);
371 if (ret < 0)
372 wpa_msg(wpa_s, MSG_INFO,
373 "Mesh MPM: failed to send peering frame");
374
375 fail:
376 wpabuf_free(buf);
377 }
378
379
380 /* configure peering state in ours and driver's station entry */
wpa_mesh_set_plink_state(struct wpa_supplicant * wpa_s,struct sta_info * sta,enum mesh_plink_state state)381 void wpa_mesh_set_plink_state(struct wpa_supplicant *wpa_s,
382 struct sta_info *sta,
383 enum mesh_plink_state state)
384 {
385 struct hostapd_sta_add_params params;
386 int ret;
387
388 wpa_msg(wpa_s, MSG_DEBUG, "MPM set " MACSTR " from %s into %s",
389 MAC2STR(sta->addr), mplstate[sta->plink_state],
390 mplstate[state]);
391 sta->plink_state = state;
392
393 os_memset(¶ms, 0, sizeof(params));
394 params.addr = sta->addr;
395 params.plink_state = state;
396 params.peer_aid = sta->peer_aid;
397 params.set = 1;
398
399 ret = wpa_drv_sta_add(wpa_s, ¶ms);
400 if (ret) {
401 wpa_msg(wpa_s, MSG_ERROR, "Driver failed to set " MACSTR
402 ": %d", MAC2STR(sta->addr), ret);
403 }
404 }
405
406
mesh_mpm_fsm_restart(struct wpa_supplicant * wpa_s,struct sta_info * sta)407 static void mesh_mpm_fsm_restart(struct wpa_supplicant *wpa_s,
408 struct sta_info *sta)
409 {
410 struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
411
412 eloop_cancel_timeout(plink_timer, wpa_s, sta);
413
414 ap_free_sta(hapd, sta);
415 }
416
417
plink_timer(void * eloop_ctx,void * user_data)418 static void plink_timer(void *eloop_ctx, void *user_data)
419 {
420 struct wpa_supplicant *wpa_s = eloop_ctx;
421 struct sta_info *sta = user_data;
422 u16 reason = 0;
423 struct mesh_conf *conf = wpa_s->ifmsh->mconf;
424 struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
425
426 switch (sta->plink_state) {
427 case PLINK_OPN_RCVD:
428 case PLINK_OPN_SNT:
429 /* retry timer */
430 if (sta->mpm_retries < conf->dot11MeshMaxRetries) {
431 eloop_register_timeout(
432 conf->dot11MeshRetryTimeout / 1000,
433 (conf->dot11MeshRetryTimeout % 1000) * 1000,
434 plink_timer, wpa_s, sta);
435 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
436 sta->mpm_retries++;
437 break;
438 }
439 reason = WLAN_REASON_MESH_MAX_RETRIES;
440 /* fall through on else */
441
442 case PLINK_CNF_RCVD:
443 /* confirm timer */
444 if (!reason)
445 reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
446 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
447 eloop_register_timeout(conf->dot11MeshHoldingTimeout / 1000,
448 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
449 plink_timer, wpa_s, sta);
450 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
451 break;
452 case PLINK_HOLDING:
453 /* holding timer */
454
455 if (sta->mesh_sae_pmksa_caching) {
456 wpa_printf(MSG_DEBUG, "MPM: Peer " MACSTR
457 " looks like it does not support mesh SAE PMKSA caching, so remove the cached entry for it",
458 MAC2STR(sta->addr));
459 wpa_auth_pmksa_remove(hapd->wpa_auth, sta->addr);
460 }
461 mesh_mpm_fsm_restart(wpa_s, sta);
462 break;
463 default:
464 break;
465 }
466 }
467
468
469 /* initiate peering with station */
470 static void
mesh_mpm_plink_open(struct wpa_supplicant * wpa_s,struct sta_info * sta,enum mesh_plink_state next_state)471 mesh_mpm_plink_open(struct wpa_supplicant *wpa_s, struct sta_info *sta,
472 enum mesh_plink_state next_state)
473 {
474 struct mesh_conf *conf = wpa_s->ifmsh->mconf;
475
476 eloop_cancel_timeout(plink_timer, wpa_s, sta);
477 eloop_register_timeout(conf->dot11MeshRetryTimeout / 1000,
478 (conf->dot11MeshRetryTimeout % 1000) * 1000,
479 plink_timer, wpa_s, sta);
480 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
481 wpa_mesh_set_plink_state(wpa_s, sta, next_state);
482 }
483
484
mesh_mpm_plink_close(struct hostapd_data * hapd,struct sta_info * sta,void * ctx)485 static int mesh_mpm_plink_close(struct hostapd_data *hapd, struct sta_info *sta,
486 void *ctx)
487 {
488 struct wpa_supplicant *wpa_s = ctx;
489 int reason = WLAN_REASON_MESH_PEERING_CANCELLED;
490
491 if (sta) {
492 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
493 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
494 wpa_printf(MSG_DEBUG, "MPM closing plink sta=" MACSTR,
495 MAC2STR(sta->addr));
496 eloop_cancel_timeout(plink_timer, wpa_s, sta);
497 return 0;
498 }
499
500 return 1;
501 }
502
503
mesh_mpm_close_peer(struct wpa_supplicant * wpa_s,const u8 * addr)504 int mesh_mpm_close_peer(struct wpa_supplicant *wpa_s, const u8 *addr)
505 {
506 struct hostapd_data *hapd;
507 struct sta_info *sta;
508
509 if (!wpa_s->ifmsh) {
510 wpa_msg(wpa_s, MSG_INFO, "Mesh is not prepared yet");
511 return -1;
512 }
513
514 hapd = wpa_s->ifmsh->bss[0];
515 sta = ap_get_sta(hapd, addr);
516 if (!sta) {
517 wpa_msg(wpa_s, MSG_INFO, "No such mesh peer");
518 return -1;
519 }
520
521 return mesh_mpm_plink_close(hapd, sta, wpa_s) == 0 ? 0 : -1;
522 }
523
524
peer_add_timer(void * eloop_ctx,void * user_data)525 static void peer_add_timer(void *eloop_ctx, void *user_data)
526 {
527 struct wpa_supplicant *wpa_s = eloop_ctx;
528 struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
529
530 os_memset(hapd->mesh_required_peer, 0, ETH_ALEN);
531 }
532
533
mesh_mpm_connect_peer(struct wpa_supplicant * wpa_s,const u8 * addr,int duration)534 int mesh_mpm_connect_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
535 int duration)
536 {
537 struct wpa_ssid *ssid = wpa_s->current_ssid;
538 struct hostapd_data *hapd;
539 struct sta_info *sta;
540 struct mesh_conf *conf;
541
542 if (!wpa_s->ifmsh) {
543 wpa_msg(wpa_s, MSG_INFO, "Mesh is not prepared yet");
544 return -1;
545 }
546
547 if (!ssid || !ssid->no_auto_peer) {
548 wpa_msg(wpa_s, MSG_INFO,
549 "This command is available only with no_auto_peer mesh network");
550 return -1;
551 }
552
553 hapd = wpa_s->ifmsh->bss[0];
554 conf = wpa_s->ifmsh->mconf;
555
556 sta = ap_get_sta(hapd, addr);
557 if (!sta) {
558 wpa_msg(wpa_s, MSG_INFO, "No such mesh peer");
559 return -1;
560 }
561
562 if ((PLINK_OPN_SNT <= sta->plink_state &&
563 sta->plink_state <= PLINK_ESTAB) ||
564 (sta->sae && sta->sae->state > SAE_NOTHING)) {
565 wpa_msg(wpa_s, MSG_INFO,
566 "Specified peer is connecting/connected");
567 return -1;
568 }
569
570 if (conf->security == MESH_CONF_SEC_NONE) {
571 mesh_mpm_plink_open(wpa_s, sta, PLINK_OPN_SNT);
572 } else {
573 mesh_rsn_auth_sae_sta(wpa_s, sta);
574 os_memcpy(hapd->mesh_required_peer, addr, ETH_ALEN);
575 eloop_register_timeout(duration == -1 ? 10 : duration, 0,
576 peer_add_timer, wpa_s, NULL);
577 }
578
579 return 0;
580 }
581
582
mesh_mpm_deinit(struct wpa_supplicant * wpa_s,struct hostapd_iface * ifmsh)583 void mesh_mpm_deinit(struct wpa_supplicant *wpa_s, struct hostapd_iface *ifmsh)
584 {
585 struct hostapd_data *hapd = ifmsh->bss[0];
586
587 /* notify peers we're leaving */
588 ap_for_each_sta(hapd, mesh_mpm_plink_close, wpa_s);
589
590 hapd->num_plinks = 0;
591 hostapd_free_stas(hapd);
592 eloop_cancel_timeout(peer_add_timer, wpa_s, NULL);
593 }
594
595
596 /* for mesh_rsn to indicate this peer has completed authentication, and we're
597 * ready to start AMPE */
mesh_mpm_auth_peer(struct wpa_supplicant * wpa_s,const u8 * addr)598 void mesh_mpm_auth_peer(struct wpa_supplicant *wpa_s, const u8 *addr)
599 {
600 struct hostapd_data *data = wpa_s->ifmsh->bss[0];
601 struct hostapd_sta_add_params params;
602 struct sta_info *sta;
603 int ret;
604
605 sta = ap_get_sta(data, addr);
606 if (!sta) {
607 wpa_msg(wpa_s, MSG_DEBUG, "no such mesh peer");
608 return;
609 }
610
611 /* TODO: Should do nothing if this STA is already authenticated, but
612 * the AP code already sets this flag. */
613 sta->flags |= WLAN_STA_AUTH;
614
615 mesh_rsn_init_ampe_sta(wpa_s, sta);
616
617 os_memset(¶ms, 0, sizeof(params));
618 params.addr = sta->addr;
619 params.flags = WPA_STA_AUTHENTICATED | WPA_STA_AUTHORIZED;
620 params.set = 1;
621
622 wpa_msg(wpa_s, MSG_DEBUG, "MPM authenticating " MACSTR,
623 MAC2STR(sta->addr));
624 ret = wpa_drv_sta_add(wpa_s, ¶ms);
625 if (ret) {
626 wpa_msg(wpa_s, MSG_ERROR,
627 "Driver failed to set " MACSTR ": %d",
628 MAC2STR(sta->addr), ret);
629 }
630
631 if (!sta->my_lid)
632 mesh_mpm_init_link(wpa_s, sta);
633
634 mesh_mpm_plink_open(wpa_s, sta, PLINK_OPN_SNT);
635 }
636
637 /*
638 * Initialize a sta_info structure for a peer and upload it into the driver
639 * in preparation for beginning authentication or peering. This is done when a
640 * Beacon (secure or open mesh) or a peering open frame (for open mesh) is
641 * received from the peer for the first time.
642 */
mesh_mpm_add_peer(struct wpa_supplicant * wpa_s,const u8 * addr,struct ieee802_11_elems * elems)643 static struct sta_info * mesh_mpm_add_peer(struct wpa_supplicant *wpa_s,
644 const u8 *addr,
645 struct ieee802_11_elems *elems)
646 {
647 struct hostapd_sta_add_params params;
648 struct mesh_conf *conf = wpa_s->ifmsh->mconf;
649 struct hostapd_data *data = wpa_s->ifmsh->bss[0];
650 struct sta_info *sta;
651 #ifdef CONFIG_IEEE80211N
652 struct ieee80211_ht_operation *oper;
653 #endif /* CONFIG_IEEE80211N */
654 int ret;
655
656 if (elems->mesh_config_len >= 7 &&
657 !(elems->mesh_config[6] & MESH_CAP_ACCEPT_ADDITIONAL_PEER)) {
658 wpa_msg(wpa_s, MSG_DEBUG,
659 "mesh: Ignore a crowded peer " MACSTR,
660 MAC2STR(addr));
661 return NULL;
662 }
663
664 sta = ap_get_sta(data, addr);
665 if (!sta) {
666 sta = ap_sta_add(data, addr);
667 if (!sta)
668 return NULL;
669 }
670
671 /* Set WMM by default since Mesh STAs are QoS STAs */
672 sta->flags |= WLAN_STA_WMM;
673
674 /* initialize sta */
675 if (copy_supp_rates(wpa_s, sta, elems)) {
676 ap_free_sta(data, sta);
677 return NULL;
678 }
679
680 if (!sta->my_lid)
681 mesh_mpm_init_link(wpa_s, sta);
682
683 #ifdef CONFIG_IEEE80211N
684 copy_sta_ht_capab(data, sta, elems->ht_capabilities);
685
686 oper = (struct ieee80211_ht_operation *) elems->ht_operation;
687 if (oper &&
688 !(oper->ht_param & HT_INFO_HT_PARAM_STA_CHNL_WIDTH) &&
689 sta->ht_capabilities) {
690 wpa_msg(wpa_s, MSG_DEBUG, MACSTR
691 " does not support 40 MHz bandwidth",
692 MAC2STR(sta->addr));
693 set_disable_ht40(sta->ht_capabilities, 1);
694 }
695
696 update_ht_state(data, sta);
697 #endif /* CONFIG_IEEE80211N */
698
699 #ifdef CONFIG_IEEE80211AC
700 copy_sta_vht_capab(data, sta, elems->vht_capabilities);
701 set_sta_vht_opmode(data, sta, elems->vht_opmode_notif);
702 #endif /* CONFIG_IEEE80211AC */
703
704 if (hostapd_get_aid(data, sta) < 0) {
705 wpa_msg(wpa_s, MSG_ERROR, "No AIDs available");
706 ap_free_sta(data, sta);
707 return NULL;
708 }
709
710 /* insert into driver */
711 os_memset(¶ms, 0, sizeof(params));
712 params.supp_rates = sta->supported_rates;
713 params.supp_rates_len = sta->supported_rates_len;
714 params.addr = addr;
715 params.plink_state = sta->plink_state;
716 params.aid = sta->aid;
717 params.peer_aid = sta->peer_aid;
718 params.listen_interval = 100;
719 params.ht_capabilities = sta->ht_capabilities;
720 params.vht_capabilities = sta->vht_capabilities;
721 params.flags |= WPA_STA_WMM;
722 params.flags_mask |= WPA_STA_AUTHENTICATED;
723 if (conf->security == MESH_CONF_SEC_NONE) {
724 params.flags |= WPA_STA_AUTHORIZED;
725 params.flags |= WPA_STA_AUTHENTICATED;
726 } else {
727 sta->flags |= WLAN_STA_MFP;
728 params.flags |= WPA_STA_MFP;
729 }
730
731 ret = wpa_drv_sta_add(wpa_s, ¶ms);
732 if (ret) {
733 wpa_msg(wpa_s, MSG_ERROR,
734 "Driver failed to insert " MACSTR ": %d",
735 MAC2STR(addr), ret);
736 ap_free_sta(data, sta);
737 return NULL;
738 }
739
740 return sta;
741 }
742
743
wpa_mesh_new_mesh_peer(struct wpa_supplicant * wpa_s,const u8 * addr,struct ieee802_11_elems * elems)744 void wpa_mesh_new_mesh_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
745 struct ieee802_11_elems *elems)
746 {
747 struct mesh_conf *conf = wpa_s->ifmsh->mconf;
748 struct hostapd_data *data = wpa_s->ifmsh->bss[0];
749 struct sta_info *sta;
750 struct wpa_ssid *ssid = wpa_s->current_ssid;
751
752 sta = mesh_mpm_add_peer(wpa_s, addr, elems);
753 if (!sta)
754 return;
755
756 if (ssid && ssid->no_auto_peer &&
757 (is_zero_ether_addr(data->mesh_required_peer) ||
758 os_memcmp(data->mesh_required_peer, addr, ETH_ALEN) != 0)) {
759 wpa_msg(wpa_s, MSG_INFO, "will not initiate new peer link with "
760 MACSTR " because of no_auto_peer", MAC2STR(addr));
761 if (data->mesh_pending_auth) {
762 struct os_reltime age;
763 const struct ieee80211_mgmt *mgmt;
764 struct hostapd_frame_info fi;
765
766 mgmt = wpabuf_head(data->mesh_pending_auth);
767 os_reltime_age(&data->mesh_pending_auth_time, &age);
768 if (age.sec < 2 &&
769 os_memcmp(mgmt->sa, addr, ETH_ALEN) == 0) {
770 wpa_printf(MSG_DEBUG,
771 "mesh: Process pending Authentication frame from %u.%06u seconds ago",
772 (unsigned int) age.sec,
773 (unsigned int) age.usec);
774 os_memset(&fi, 0, sizeof(fi));
775 ieee802_11_mgmt(
776 data,
777 wpabuf_head(data->mesh_pending_auth),
778 wpabuf_len(data->mesh_pending_auth),
779 &fi);
780 }
781 wpabuf_free(data->mesh_pending_auth);
782 data->mesh_pending_auth = NULL;
783 }
784 return;
785 }
786
787 if (conf->security == MESH_CONF_SEC_NONE) {
788 if (sta->plink_state < PLINK_OPN_SNT ||
789 sta->plink_state > PLINK_ESTAB)
790 mesh_mpm_plink_open(wpa_s, sta, PLINK_OPN_SNT);
791 } else {
792 mesh_rsn_auth_sae_sta(wpa_s, sta);
793 }
794 }
795
796
mesh_mpm_mgmt_rx(struct wpa_supplicant * wpa_s,struct rx_mgmt * rx_mgmt)797 void mesh_mpm_mgmt_rx(struct wpa_supplicant *wpa_s, struct rx_mgmt *rx_mgmt)
798 {
799 struct hostapd_frame_info fi;
800
801 os_memset(&fi, 0, sizeof(fi));
802 fi.datarate = rx_mgmt->datarate;
803 fi.ssi_signal = rx_mgmt->ssi_signal;
804 ieee802_11_mgmt(wpa_s->ifmsh->bss[0], rx_mgmt->frame,
805 rx_mgmt->frame_len, &fi);
806 }
807
808
mesh_mpm_plink_estab(struct wpa_supplicant * wpa_s,struct sta_info * sta)809 static void mesh_mpm_plink_estab(struct wpa_supplicant *wpa_s,
810 struct sta_info *sta)
811 {
812 struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
813 struct mesh_conf *conf = wpa_s->ifmsh->mconf;
814 u8 seq[6] = {};
815
816 wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR " established",
817 MAC2STR(sta->addr));
818
819 if (conf->security & MESH_CONF_SEC_AMPE) {
820 wpa_hexdump_key(MSG_DEBUG, "mesh: MTK", sta->mtk, sta->mtk_len);
821 wpa_drv_set_key(wpa_s, wpa_cipher_to_alg(conf->pairwise_cipher),
822 sta->addr, 0, 0, seq, sizeof(seq),
823 sta->mtk, sta->mtk_len);
824
825 wpa_hexdump_key(MSG_DEBUG, "mesh: RX MGTK Key RSC",
826 sta->mgtk_rsc, sizeof(sta->mgtk_rsc));
827 wpa_hexdump_key(MSG_DEBUG, "mesh: RX MGTK",
828 sta->mgtk, sta->mgtk_len);
829 wpa_drv_set_key(wpa_s, wpa_cipher_to_alg(conf->group_cipher),
830 sta->addr, sta->mgtk_key_id, 0,
831 sta->mgtk_rsc, sizeof(sta->mgtk_rsc),
832 sta->mgtk, sta->mgtk_len);
833
834 if (sta->igtk_len) {
835 wpa_hexdump_key(MSG_DEBUG, "mesh: RX IGTK Key RSC",
836 sta->igtk_rsc, sizeof(sta->igtk_rsc));
837 wpa_hexdump_key(MSG_DEBUG, "mesh: RX IGTK",
838 sta->igtk, sta->igtk_len);
839 wpa_drv_set_key(
840 wpa_s,
841 wpa_cipher_to_alg(conf->mgmt_group_cipher),
842 sta->addr, sta->igtk_key_id, 0,
843 sta->igtk_rsc, sizeof(sta->igtk_rsc),
844 sta->igtk, sta->igtk_len);
845 }
846 }
847
848 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_ESTAB);
849 hapd->num_plinks++;
850
851 sta->flags |= WLAN_STA_ASSOC;
852 sta->mesh_sae_pmksa_caching = 0;
853
854 eloop_cancel_timeout(peer_add_timer, wpa_s, NULL);
855 peer_add_timer(wpa_s, NULL);
856 eloop_cancel_timeout(plink_timer, wpa_s, sta);
857
858 /* Send ctrl event */
859 wpa_msg(wpa_s, MSG_INFO, MESH_PEER_CONNECTED MACSTR,
860 MAC2STR(sta->addr));
861
862 /* Send D-Bus event */
863 wpas_notify_mesh_peer_connected(wpa_s, sta->addr);
864 }
865
866
mesh_mpm_fsm(struct wpa_supplicant * wpa_s,struct sta_info * sta,enum plink_event event,u16 reason)867 static void mesh_mpm_fsm(struct wpa_supplicant *wpa_s, struct sta_info *sta,
868 enum plink_event event, u16 reason)
869 {
870 struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
871 struct mesh_conf *conf = wpa_s->ifmsh->mconf;
872
873 wpa_msg(wpa_s, MSG_DEBUG, "MPM " MACSTR " state %s event %s",
874 MAC2STR(sta->addr), mplstate[sta->plink_state],
875 mplevent[event]);
876
877 switch (sta->plink_state) {
878 case PLINK_IDLE:
879 switch (event) {
880 case CLS_ACPT:
881 mesh_mpm_fsm_restart(wpa_s, sta);
882 break;
883 case OPN_ACPT:
884 mesh_mpm_plink_open(wpa_s, sta, PLINK_OPN_RCVD);
885 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CONFIRM,
886 0);
887 break;
888 case REQ_RJCT:
889 mesh_mpm_send_plink_action(wpa_s, sta,
890 PLINK_CLOSE, reason);
891 break;
892 default:
893 break;
894 }
895 break;
896 case PLINK_OPN_SNT:
897 switch (event) {
898 case OPN_RJCT:
899 case CNF_RJCT:
900 if (!reason)
901 reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
902 /* fall-through */
903 case CLS_ACPT:
904 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
905 if (!reason)
906 reason = WLAN_REASON_MESH_CLOSE_RCVD;
907 eloop_register_timeout(
908 conf->dot11MeshHoldingTimeout / 1000,
909 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
910 plink_timer, wpa_s, sta);
911 mesh_mpm_send_plink_action(wpa_s, sta,
912 PLINK_CLOSE, reason);
913 break;
914 case OPN_ACPT:
915 /* retry timer is left untouched */
916 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_OPN_RCVD);
917 mesh_mpm_send_plink_action(wpa_s, sta,
918 PLINK_CONFIRM, 0);
919 break;
920 case CNF_ACPT:
921 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_CNF_RCVD);
922 eloop_cancel_timeout(plink_timer, wpa_s, sta);
923 eloop_register_timeout(
924 conf->dot11MeshConfirmTimeout / 1000,
925 (conf->dot11MeshConfirmTimeout % 1000) * 1000,
926 plink_timer, wpa_s, sta);
927 break;
928 default:
929 break;
930 }
931 break;
932 case PLINK_OPN_RCVD:
933 switch (event) {
934 case OPN_RJCT:
935 case CNF_RJCT:
936 if (!reason)
937 reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
938 /* fall-through */
939 case CLS_ACPT:
940 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
941 if (!reason)
942 reason = WLAN_REASON_MESH_CLOSE_RCVD;
943 eloop_register_timeout(
944 conf->dot11MeshHoldingTimeout / 1000,
945 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
946 plink_timer, wpa_s, sta);
947 sta->mpm_close_reason = reason;
948 mesh_mpm_send_plink_action(wpa_s, sta,
949 PLINK_CLOSE, reason);
950 break;
951 case OPN_ACPT:
952 mesh_mpm_send_plink_action(wpa_s, sta,
953 PLINK_CONFIRM, 0);
954 break;
955 case CNF_ACPT:
956 if (conf->security & MESH_CONF_SEC_AMPE)
957 mesh_rsn_derive_mtk(wpa_s, sta);
958 mesh_mpm_plink_estab(wpa_s, sta);
959 break;
960 default:
961 break;
962 }
963 break;
964 case PLINK_CNF_RCVD:
965 switch (event) {
966 case OPN_RJCT:
967 case CNF_RJCT:
968 if (!reason)
969 reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
970 /* fall-through */
971 case CLS_ACPT:
972 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
973 if (!reason)
974 reason = WLAN_REASON_MESH_CLOSE_RCVD;
975 eloop_register_timeout(
976 conf->dot11MeshHoldingTimeout / 1000,
977 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
978 plink_timer, wpa_s, sta);
979 sta->mpm_close_reason = reason;
980 mesh_mpm_send_plink_action(wpa_s, sta,
981 PLINK_CLOSE, reason);
982 break;
983 case OPN_ACPT:
984 if (conf->security & MESH_CONF_SEC_AMPE)
985 mesh_rsn_derive_mtk(wpa_s, sta);
986 mesh_mpm_plink_estab(wpa_s, sta);
987 mesh_mpm_send_plink_action(wpa_s, sta,
988 PLINK_CONFIRM, 0);
989 break;
990 default:
991 break;
992 }
993 break;
994 case PLINK_ESTAB:
995 switch (event) {
996 case OPN_RJCT:
997 case CNF_RJCT:
998 case CLS_ACPT:
999 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
1000 if (!reason)
1001 reason = WLAN_REASON_MESH_CLOSE_RCVD;
1002
1003 eloop_register_timeout(
1004 conf->dot11MeshHoldingTimeout / 1000,
1005 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
1006 plink_timer, wpa_s, sta);
1007 sta->mpm_close_reason = reason;
1008
1009 wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR
1010 " closed with reason %d",
1011 MAC2STR(sta->addr), reason);
1012
1013 wpa_msg(wpa_s, MSG_INFO, MESH_PEER_DISCONNECTED MACSTR,
1014 MAC2STR(sta->addr));
1015
1016 /* Send D-Bus event */
1017 wpas_notify_mesh_peer_disconnected(wpa_s, sta->addr,
1018 reason);
1019
1020 hapd->num_plinks--;
1021
1022 mesh_mpm_send_plink_action(wpa_s, sta,
1023 PLINK_CLOSE, reason);
1024 break;
1025 case OPN_ACPT:
1026 mesh_mpm_send_plink_action(wpa_s, sta,
1027 PLINK_CONFIRM, 0);
1028 break;
1029 default:
1030 break;
1031 }
1032 break;
1033 case PLINK_HOLDING:
1034 switch (event) {
1035 case CLS_ACPT:
1036 mesh_mpm_fsm_restart(wpa_s, sta);
1037 break;
1038 case OPN_ACPT:
1039 case CNF_ACPT:
1040 case OPN_RJCT:
1041 case CNF_RJCT:
1042 reason = sta->mpm_close_reason;
1043 mesh_mpm_send_plink_action(wpa_s, sta,
1044 PLINK_CLOSE, reason);
1045 break;
1046 default:
1047 break;
1048 }
1049 break;
1050 default:
1051 wpa_msg(wpa_s, MSG_DEBUG,
1052 "Unsupported MPM event %s for state %s",
1053 mplevent[event], mplstate[sta->plink_state]);
1054 break;
1055 }
1056 }
1057
1058
mesh_mpm_action_rx(struct wpa_supplicant * wpa_s,const struct ieee80211_mgmt * mgmt,size_t len)1059 void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
1060 const struct ieee80211_mgmt *mgmt, size_t len)
1061 {
1062 u8 action_field;
1063 struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
1064 struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
1065 struct sta_info *sta;
1066 u16 plid = 0, llid = 0, aid = 0;
1067 enum plink_event event;
1068 struct ieee802_11_elems elems;
1069 struct mesh_peer_mgmt_ie peer_mgmt_ie;
1070 const u8 *ies;
1071 size_t ie_len;
1072 int ret;
1073 u16 reason = 0;
1074
1075 if (mgmt->u.action.category != WLAN_ACTION_SELF_PROTECTED)
1076 return;
1077
1078 action_field = mgmt->u.action.u.slf_prot_action.action;
1079 if (action_field != PLINK_OPEN &&
1080 action_field != PLINK_CONFIRM &&
1081 action_field != PLINK_CLOSE)
1082 return;
1083
1084 ies = mgmt->u.action.u.slf_prot_action.variable;
1085 ie_len = (const u8 *) mgmt + len -
1086 mgmt->u.action.u.slf_prot_action.variable;
1087
1088 /* at least expect mesh id and peering mgmt */
1089 if (ie_len < 2 + 2) {
1090 wpa_printf(MSG_DEBUG,
1091 "MPM: Ignore too short action frame %u ie_len %u",
1092 action_field, (unsigned int) ie_len);
1093 return;
1094 }
1095 wpa_printf(MSG_DEBUG, "MPM: Received PLINK action %u", action_field);
1096
1097 if (action_field == PLINK_OPEN || action_field == PLINK_CONFIRM) {
1098 wpa_printf(MSG_DEBUG, "MPM: Capability 0x%x",
1099 WPA_GET_LE16(ies));
1100 ies += 2; /* capability */
1101 ie_len -= 2;
1102 }
1103 if (action_field == PLINK_CONFIRM) {
1104 aid = WPA_GET_LE16(ies);
1105 wpa_printf(MSG_DEBUG, "MPM: AID 0x%x", aid);
1106 ies += 2; /* aid */
1107 ie_len -= 2;
1108 }
1109
1110 /* check for mesh peering, mesh id and mesh config IEs */
1111 if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
1112 wpa_printf(MSG_DEBUG, "MPM: Failed to parse PLINK IEs");
1113 return;
1114 }
1115 if (!elems.peer_mgmt) {
1116 wpa_printf(MSG_DEBUG,
1117 "MPM: No Mesh Peering Management element");
1118 return;
1119 }
1120 if (action_field != PLINK_CLOSE) {
1121 if (!elems.mesh_id || !elems.mesh_config) {
1122 wpa_printf(MSG_DEBUG,
1123 "MPM: No Mesh ID or Mesh Configuration element");
1124 return;
1125 }
1126
1127 if (!matches_local(wpa_s, &elems)) {
1128 wpa_printf(MSG_DEBUG,
1129 "MPM: Mesh ID or Mesh Configuration element do not match local MBSS");
1130 return;
1131 }
1132 }
1133
1134 ret = mesh_mpm_parse_peer_mgmt(wpa_s, action_field,
1135 elems.peer_mgmt,
1136 elems.peer_mgmt_len,
1137 &peer_mgmt_ie);
1138 if (ret) {
1139 wpa_printf(MSG_DEBUG, "MPM: Mesh parsing rejected frame");
1140 return;
1141 }
1142
1143 /* the sender's llid is our plid and vice-versa */
1144 plid = WPA_GET_LE16(peer_mgmt_ie.llid);
1145 if (peer_mgmt_ie.plid)
1146 llid = WPA_GET_LE16(peer_mgmt_ie.plid);
1147 wpa_printf(MSG_DEBUG, "MPM: plid=0x%x llid=0x%x", plid, llid);
1148
1149 if (action_field == PLINK_CLOSE)
1150 wpa_printf(MSG_DEBUG, "MPM: close reason=%u",
1151 WPA_GET_LE16(peer_mgmt_ie.reason));
1152
1153 sta = ap_get_sta(hapd, mgmt->sa);
1154
1155 /*
1156 * If this is an open frame from an unknown STA, and this is an
1157 * open mesh, then go ahead and add the peer before proceeding.
1158 */
1159 if (!sta && action_field == PLINK_OPEN &&
1160 (!(mconf->security & MESH_CONF_SEC_AMPE) ||
1161 wpa_auth_pmksa_get(hapd->wpa_auth, mgmt->sa, NULL)))
1162 sta = mesh_mpm_add_peer(wpa_s, mgmt->sa, &elems);
1163
1164 if (!sta) {
1165 wpa_printf(MSG_DEBUG, "MPM: No STA entry for peer");
1166 return;
1167 }
1168
1169 #ifdef CONFIG_SAE
1170 /* peer is in sae_accepted? */
1171 if (sta->sae && sta->sae->state != SAE_ACCEPTED) {
1172 wpa_printf(MSG_DEBUG, "MPM: SAE not yet accepted for peer");
1173 return;
1174 }
1175 #endif /* CONFIG_SAE */
1176
1177 if (!sta->my_lid)
1178 mesh_mpm_init_link(wpa_s, sta);
1179
1180 if (mconf->security & MESH_CONF_SEC_AMPE) {
1181 int res;
1182
1183 res = mesh_rsn_process_ampe(wpa_s, sta, &elems,
1184 &mgmt->u.action.category,
1185 peer_mgmt_ie.chosen_pmk,
1186 ies, ie_len);
1187 if (res) {
1188 wpa_printf(MSG_DEBUG,
1189 "MPM: RSN process rejected frame (res=%d)",
1190 res);
1191 if (action_field == PLINK_OPEN && res == -2) {
1192 /* AES-SIV decryption failed */
1193 mesh_mpm_fsm(wpa_s, sta, OPN_RJCT,
1194 WLAN_REASON_MESH_INVALID_GTK);
1195 }
1196 return;
1197 }
1198 }
1199
1200 if (sta->plink_state == PLINK_BLOCKED) {
1201 wpa_printf(MSG_DEBUG, "MPM: PLINK_BLOCKED");
1202 return;
1203 }
1204
1205 /* Now we will figure out the appropriate event... */
1206 switch (action_field) {
1207 case PLINK_OPEN:
1208 if (plink_free_count(hapd) == 0) {
1209 event = REQ_RJCT;
1210 reason = WLAN_REASON_MESH_MAX_PEERS;
1211 wpa_printf(MSG_INFO,
1212 "MPM: Peer link num over quota(%d)",
1213 hapd->max_plinks);
1214 } else if (sta->peer_lid && sta->peer_lid != plid) {
1215 wpa_printf(MSG_DEBUG,
1216 "MPM: peer_lid mismatch: 0x%x != 0x%x",
1217 sta->peer_lid, plid);
1218 return; /* no FSM event */
1219 } else {
1220 sta->peer_lid = plid;
1221 event = OPN_ACPT;
1222 }
1223 break;
1224 case PLINK_CONFIRM:
1225 if (plink_free_count(hapd) == 0) {
1226 event = REQ_RJCT;
1227 reason = WLAN_REASON_MESH_MAX_PEERS;
1228 wpa_printf(MSG_INFO,
1229 "MPM: Peer link num over quota(%d)",
1230 hapd->max_plinks);
1231 } else if (sta->my_lid != llid ||
1232 (sta->peer_lid && sta->peer_lid != plid)) {
1233 wpa_printf(MSG_DEBUG,
1234 "MPM: lid mismatch: my_lid: 0x%x != 0x%x or peer_lid: 0x%x != 0x%x",
1235 sta->my_lid, llid, sta->peer_lid, plid);
1236 return; /* no FSM event */
1237 } else {
1238 if (!sta->peer_lid)
1239 sta->peer_lid = plid;
1240 sta->peer_aid = aid;
1241 event = CNF_ACPT;
1242 }
1243 break;
1244 case PLINK_CLOSE:
1245 if (sta->plink_state == PLINK_ESTAB)
1246 /* Do not check for llid or plid. This does not
1247 * follow the standard but since multiple plinks
1248 * per cand are not supported, it is necessary in
1249 * order to avoid a livelock when MP A sees an
1250 * establish peer link to MP B but MP B does not
1251 * see it. This can be caused by a timeout in
1252 * B's peer link establishment or B being
1253 * restarted.
1254 */
1255 event = CLS_ACPT;
1256 else if (sta->peer_lid != plid) {
1257 wpa_printf(MSG_DEBUG,
1258 "MPM: peer_lid mismatch: 0x%x != 0x%x",
1259 sta->peer_lid, plid);
1260 return; /* no FSM event */
1261 } else if (peer_mgmt_ie.plid && sta->my_lid != llid) {
1262 wpa_printf(MSG_DEBUG,
1263 "MPM: my_lid mismatch: 0x%x != 0x%x",
1264 sta->my_lid, llid);
1265 return; /* no FSM event */
1266 } else {
1267 event = CLS_ACPT;
1268 }
1269 break;
1270 default:
1271 /*
1272 * This cannot be hit due to the action_field check above, but
1273 * compilers may not be able to figure that out and can warn
1274 * about uninitialized event below.
1275 */
1276 return;
1277 }
1278 mesh_mpm_fsm(wpa_s, sta, event, reason);
1279 }
1280
1281
1282 /* called by ap_free_sta */
mesh_mpm_free_sta(struct hostapd_data * hapd,struct sta_info * sta)1283 void mesh_mpm_free_sta(struct hostapd_data *hapd, struct sta_info *sta)
1284 {
1285 if (sta->plink_state == PLINK_ESTAB)
1286 hapd->num_plinks--;
1287 eloop_cancel_timeout(plink_timer, ELOOP_ALL_CTX, sta);
1288 eloop_cancel_timeout(mesh_auth_timer, ELOOP_ALL_CTX, sta);
1289 }
1290