wpa_supplicant/mesh_mpm.c

   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 "ap/hostapd.h"
  15 #include "ap/sta_info.h"
  16 #include "ap/ieee802_11.h"
  17 #include "wpa_supplicant_i.h"
  18 #include "driver_i.h"
  19 #include "mesh_mpm.h"
  20 #include "mesh_rsn.h"
  21
  22 struct mesh_peer_mgmt_ie {
  23         const u8 *proto_id;
  24         const u8 *llid;
  25         const u8 *plid;
  26         const u8 *reason;
  27         const u8 *pmk;
  28 };
  29
  30 static void plink_timer(void *eloop_ctx, void *user_data);
  31
  32
  33 enum plink_event {
  34         PLINK_UNDEFINED,
  35         OPN_ACPT,
  36         OPN_RJCT,
  37         OPN_IGNR,
  38         CNF_ACPT,
  39         CNF_RJCT,
  40         CNF_IGNR,
  41         CLS_ACPT,
  42         CLS_IGNR
  43 };
  44
  45 static const char * const mplstate[] = {
  46         [PLINK_LISTEN] = "LISTEN",
  47         [PLINK_OPEN_SENT] = "OPEN_SENT",
  48         [PLINK_OPEN_RCVD] = "OPEN_RCVD",
  49         [PLINK_CNF_RCVD] = "CNF_RCVD",
  50         [PLINK_ESTAB] = "ESTAB",
  51         [PLINK_HOLDING] = "HOLDING",
  52         [PLINK_BLOCKED] = "BLOCKED"
  53 };
  54
  55 static const char * const mplevent[] = {
  56         [PLINK_UNDEFINED] = "UNDEFINED",
  57         [OPN_ACPT] = "OPN_ACPT",
  58         [OPN_RJCT] = "OPN_RJCT",
  59         [OPN_IGNR] = "OPN_IGNR",
  60         [CNF_ACPT] = "CNF_ACPT",
  61         [CNF_RJCT] = "CNF_RJCT",
  62         [CNF_IGNR] = "CNF_IGNR",
  63         [CLS_ACPT] = "CLS_ACPT",
  64         [CLS_IGNR] = "CLS_IGNR"
  65 };
  66
  67
  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 PMK at end */
  76         if (len >= 16) {
  77                 len -= 16;
  78                 mpm_ie->pmk = ie + len - 16;
  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         /* plid, present for confirm, and possibly close */
 105         if (len)
 106                 mpm_ie->plid = ie;
 107
 108         return 0;
 109 }
 110
 111
 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
 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 */
 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 */
 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 */
 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->plink_state = PLINK_LISTEN;
 197 }
 198
 199
 200 static void mesh_mpm_send_plink_action(struct wpa_supplicant *wpa_s,
 201                                        struct sta_info *sta,
 202                                        enum plink_action_field type,
 203                                        u16 close_reason)
 204 {
 205         struct wpabuf *buf;
 206         struct hostapd_iface *ifmsh = wpa_s->ifmsh;
 207         struct hostapd_data *bss = ifmsh->bss[0];
 208         struct mesh_conf *conf = ifmsh->mconf;
 209         u8 supp_rates[2 + 2 + 32];
 210 #ifdef CONFIG_IEEE80211N
 211         u8 ht_capa_oper[2 + 26 + 2 + 22];
 212 #endif /* CONFIG_IEEE80211N */
 213         u8 *pos, *cat;
 214         u8 ie_len, add_plid = 0;
 215         int ret;
 216         int ampe = conf->security & MESH_CONF_SEC_AMPE;
 217         size_t buf_len;
 218
 219         if (!sta)
 220                 return;
 221
 222         buf_len = 2 +      /* capability info */
 223                   2 +      /* AID */
 224                   2 + 8 +  /* supported rates */
 225                   2 + (32 - 8) +
 226                   2 + 32 + /* mesh ID */
 227                   2 + 7 +  /* mesh config */
 228                   2 + 23 + /* peering management */
 229                   2 + 96 + /* AMPE */
 230                   2 + 16;  /* MIC */
 231 #ifdef CONFIG_IEEE80211N
 232         if (type != PLINK_CLOSE &&
 233             wpa_s->current_ssid->mesh_ht_mode > CHAN_NO_HT) {
 234                 buf_len += 2 + 26 + /* HT capabilities */
 235                            2 + 22;  /* HT operation */
 236         }
 237 #endif /* CONFIG_IEEE80211N */
 238         buf = wpabuf_alloc(buf_len);
 239         if (!buf)
 240                 return;
 241
 242         cat = wpabuf_mhead_u8(buf);
 243         wpabuf_put_u8(buf, WLAN_ACTION_SELF_PROTECTED);
 244         wpabuf_put_u8(buf, type);
 245
 246         if (type != PLINK_CLOSE) {
 247                 /* capability info */
 248                 wpabuf_put_le16(buf, ampe ? IEEE80211_CAP_PRIVACY : 0);
 249
 250                 /* aid */
 251                 if (type == PLINK_CONFIRM)
 252                         wpabuf_put_le16(buf, sta->peer_lid);
 253
 254                 /* IE: supp + ext. supp rates */
 255                 pos = hostapd_eid_supp_rates(bss, supp_rates);
 256                 pos = hostapd_eid_ext_supp_rates(bss, pos);
 257                 wpabuf_put_data(buf, supp_rates, pos - supp_rates);
 258
 259                 /* IE: Mesh ID */
 260                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 261                 wpabuf_put_u8(buf, conf->meshid_len);
 262                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 263
 264                 /* IE: mesh conf */
 265                 wpabuf_put_u8(buf, WLAN_EID_MESH_CONFIG);
 266                 wpabuf_put_u8(buf, 7);
 267                 wpabuf_put_u8(buf, conf->mesh_pp_id);
 268                 wpabuf_put_u8(buf, conf->mesh_pm_id);
 269                 wpabuf_put_u8(buf, conf->mesh_cc_id);
 270                 wpabuf_put_u8(buf, conf->mesh_sp_id);
 271                 wpabuf_put_u8(buf, conf->mesh_auth_id);
 272                 /* TODO: formation info */
 273                 wpabuf_put_u8(buf, 0);
 274                 /* always forwarding & accepting plinks for now */
 275                 wpabuf_put_u8(buf, 0x1 | 0x8);
 276         } else {        /* Peer closing frame */
 277                 /* IE: Mesh ID */
 278                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 279                 wpabuf_put_u8(buf, conf->meshid_len);
 280                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 281         }
 282
 283         /* IE: Mesh Peering Management element */
 284         ie_len = 4;
 285         if (ampe)
 286                 ie_len += PMKID_LEN;
 287         switch (type) {
 288         case PLINK_OPEN:
 289                 break;
 290         case PLINK_CONFIRM:
 291                 ie_len += 2;
 292                 add_plid = 1;
 293                 break;
 294         case PLINK_CLOSE:
 295                 ie_len += 2;
 296                 add_plid = 1;
 297                 ie_len += 2; /* reason code */
 298                 break;
 299         }
 300
 301         wpabuf_put_u8(buf, WLAN_EID_PEER_MGMT);
 302         wpabuf_put_u8(buf, ie_len);
 303         /* peering protocol */
 304         if (ampe)
 305                 wpabuf_put_le16(buf, 1);
 306         else
 307                 wpabuf_put_le16(buf, 0);
 308         wpabuf_put_le16(buf, sta->my_lid);
 309         if (add_plid)
 310                 wpabuf_put_le16(buf, sta->peer_lid);
 311         if (type == PLINK_CLOSE)
 312                 wpabuf_put_le16(buf, close_reason);
 313         if (ampe)
 314                 mesh_rsn_get_pmkid(wpa_s->mesh_rsn, sta,
 315                                    wpabuf_put(buf, PMKID_LEN));
 316
 317 #ifdef CONFIG_IEEE80211N
 318         if (type != PLINK_CLOSE &&
 319             wpa_s->current_ssid->mesh_ht_mode > CHAN_NO_HT) {
 320                 pos = hostapd_eid_ht_capabilities(bss, ht_capa_oper);
 321                 pos = hostapd_eid_ht_operation(bss, pos);
 322                 wpabuf_put_data(buf, ht_capa_oper, pos - ht_capa_oper);
 323         }
 324 #endif /* CONFIG_IEEE80211N */
 325
 326         if (ampe && mesh_rsn_protect_frame(wpa_s->mesh_rsn, sta, cat, buf)) {
 327                 wpa_msg(wpa_s, MSG_INFO,
 328                         "Mesh MPM: failed to add AMPE and MIC IE");
 329                 goto fail;
 330         }
 331
 332         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0,
 333                                   sta->addr, wpa_s->own_addr, wpa_s->own_addr,
 334                                   wpabuf_head(buf), wpabuf_len(buf), 0);
 335         if (ret < 0)
 336                 wpa_msg(wpa_s, MSG_INFO,
 337                         "Mesh MPM: failed to send peering frame");
 338
 339 fail:
 340         wpabuf_free(buf);
 341 }
 342
 343
 344 /* configure peering state in ours and driver's station entry */
 345 static void
 346 wpa_mesh_set_plink_state(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 347                          enum mesh_plink_state state)
 348 {
 349         struct hostapd_sta_add_params params;
 350         int ret;
 351
 352         sta->plink_state = state;
 353
 354         os_memset(&params, 0, sizeof(params));
 355         params.addr = sta->addr;
 356         params.plink_state = state;
 357         params.set = 1;
 358
 359         wpa_msg(wpa_s, MSG_DEBUG, "MPM set " MACSTR " into %s",
 360                 MAC2STR(sta->addr), mplstate[state]);
 361         ret = wpa_drv_sta_add(wpa_s, &params);
 362         if (ret) {
 363                 wpa_msg(wpa_s, MSG_ERROR, "Driver failed to set " MACSTR
 364                         ": %d", MAC2STR(sta->addr), ret);
 365         }
 366 }
 367
 368
 369 static void mesh_mpm_fsm_restart(struct wpa_supplicant *wpa_s,
 370                                  struct sta_info *sta)
 371 {
 372         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 373
 374         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 375
 376         if (sta->mpm_close_reason == WLAN_REASON_MESH_CLOSE_RCVD) {
 377                 ap_free_sta(hapd, sta);
 378                 return;
 379         }
 380
 381         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_LISTEN);
 382         sta->my_lid = sta->peer_lid = sta->mpm_close_reason = 0;
 383         sta->mpm_retries = 0;
 384 }
 385
 386
 387 static void plink_timer(void *eloop_ctx, void *user_data)
 388 {
 389         struct wpa_supplicant *wpa_s = eloop_ctx;
 390         struct sta_info *sta = user_data;
 391         u16 reason = 0;
 392         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 393
 394         switch (sta->plink_state) {
 395         case PLINK_OPEN_RCVD:
 396         case PLINK_OPEN_SENT:
 397                 /* retry timer */
 398                 if (sta->mpm_retries < conf->dot11MeshMaxRetries) {
 399                         eloop_register_timeout(
 400                                 conf->dot11MeshRetryTimeout / 1000,
 401                                 (conf->dot11MeshRetryTimeout % 1000) * 1000,
 402                                 plink_timer, wpa_s, sta);
 403                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 404                         sta->mpm_retries++;
 405                         break;
 406                 }
 407                 reason = WLAN_REASON_MESH_MAX_RETRIES;
 408                 /* fall through on else */
 409
 410         case PLINK_CNF_RCVD:
 411                 /* confirm timer */
 412                 if (!reason)
 413                         reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
 414                 sta->plink_state = PLINK_HOLDING;
 415                 eloop_register_timeout(conf->dot11MeshHoldingTimeout / 1000,
 416                         (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 417                         plink_timer, wpa_s, sta);
 418                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 419                 break;
 420         case PLINK_HOLDING:
 421                 /* holding timer */
 422                 mesh_mpm_fsm_restart(wpa_s, sta);
 423                 break;
 424         default:
 425                 break;
 426         }
 427 }
 428
 429
 430 /* initiate peering with station */
 431 static void
 432 mesh_mpm_plink_open(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 433                     enum mesh_plink_state next_state)
 434 {
 435         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 436
 437         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 438         eloop_register_timeout(conf->dot11MeshRetryTimeout / 1000,
 439                                (conf->dot11MeshRetryTimeout % 1000) * 1000,
 440                                plink_timer, wpa_s, sta);
 441         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 442         wpa_mesh_set_plink_state(wpa_s, sta, next_state);
 443 }
 444
 445
 446 int mesh_mpm_plink_close(struct hostapd_data *hapd,
 447                          struct sta_info *sta, void *ctx)
 448 {
 449         struct wpa_supplicant *wpa_s = ctx;
 450         int reason = WLAN_REASON_MESH_PEERING_CANCELLED;
 451
 452         if (sta) {
 453                 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 454                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 455                 wpa_printf(MSG_DEBUG, "MPM closing plink sta=" MACSTR,
 456                            MAC2STR(sta->addr));
 457                 eloop_cancel_timeout(plink_timer, wpa_s, sta);
 458                 return 0;
 459         }
 460
 461         return 1;
 462 }
 463
 464
 465 void mesh_mpm_deinit(struct wpa_supplicant *wpa_s, struct hostapd_iface *ifmsh)
 466 {
 467         struct hostapd_data *hapd = ifmsh->bss[0];
 468
 469         /* notify peers we're leaving */
 470         ap_for_each_sta(hapd, mesh_mpm_plink_close, wpa_s);
 471
 472         hapd->num_plinks = 0;
 473         hostapd_free_stas(hapd);
 474 }
 475
 476
 477 /* for mesh_rsn to indicate this peer has completed authentication, and we're
 478  * ready to start AMPE */
 479 void mesh_mpm_auth_peer(struct wpa_supplicant *wpa_s, const u8 *addr)
 480 {
 481         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 482         struct hostapd_sta_add_params params;
 483         struct sta_info *sta;
 484         int ret;
 485
 486         sta = ap_get_sta(data, addr);
 487         if (!sta) {
 488                 wpa_msg(wpa_s, MSG_DEBUG, "no such mesh peer");
 489                 return;
 490         }
 491
 492         /* TODO: Should do nothing if this STA is already authenticated, but
 493          * the AP code already sets this flag. */
 494         sta->flags |= WLAN_STA_AUTH;
 495
 496         mesh_rsn_init_ampe_sta(wpa_s, sta);
 497
 498         os_memset(&params, 0, sizeof(params));
 499         params.addr = sta->addr;
 500         params.flags = WPA_STA_AUTHENTICATED | WPA_STA_AUTHORIZED;
 501         params.set = 1;
 502
 503         wpa_msg(wpa_s, MSG_DEBUG, "MPM authenticating " MACSTR,
 504                 MAC2STR(sta->addr));
 505         ret = wpa_drv_sta_add(wpa_s, &params);
 506         if (ret) {
 507                 wpa_msg(wpa_s, MSG_ERROR,
 508                         "Driver failed to set " MACSTR ": %d",
 509                         MAC2STR(sta->addr), ret);
 510         }
 511
 512         if (!sta->my_lid)
 513                 mesh_mpm_init_link(wpa_s, sta);
 514
 515         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 516 }
 517
 518
 519 void wpa_mesh_new_mesh_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 520                             struct ieee802_11_elems *elems)
 521 {
 522         struct hostapd_sta_add_params params;
 523         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 524         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 525         struct sta_info *sta;
 526         struct wpa_ssid *ssid = wpa_s->current_ssid;
 527         int ret = 0;
 528
 529         sta = ap_get_sta(data, addr);
 530         if (!sta) {
 531                 sta = ap_sta_add(data, addr);
 532                 if (!sta)
 533                         return;
 534         }
 535
 536         /* initialize sta */
 537         if (copy_supp_rates(wpa_s, sta, elems))
 538                 return;
 539
 540         mesh_mpm_init_link(wpa_s, sta);
 541
 542 #ifdef CONFIG_IEEE80211N
 543         copy_sta_ht_capab(data, sta, elems->ht_capabilities,
 544                         elems->ht_capabilities_len);
 545         update_ht_state(data, sta);
 546 #endif /* CONFIG_IEEE80211N */
 547
 548         /* insert into driver */
 549         os_memset(&params, 0, sizeof(params));
 550         params.supp_rates = sta->supported_rates;
 551         params.supp_rates_len = sta->supported_rates_len;
 552         params.addr = addr;
 553         params.plink_state = sta->plink_state;
 554         params.aid = sta->peer_lid;
 555         params.listen_interval = 100;
 556         params.ht_capabilities = sta->ht_capabilities;
 557         params.flags |= WPA_STA_WMM;
 558         params.flags_mask |= WPA_STA_AUTHENTICATED;
 559         if (conf->security == MESH_CONF_SEC_NONE) {
 560                 params.flags |= WPA_STA_AUTHORIZED;
 561                 params.flags |= WPA_STA_AUTHENTICATED;
 562         } else {
 563                 sta->flags |= WLAN_STA_MFP;
 564                 params.flags |= WPA_STA_MFP;
 565         }
 566
 567         ret = wpa_drv_sta_add(wpa_s, &params);
 568         if (ret) {
 569                 wpa_msg(wpa_s, MSG_ERROR,
 570                         "Driver failed to insert " MACSTR ": %d",
 571                         MAC2STR(addr), ret);
 572                 return;
 573         }
 574
 575         if (ssid && ssid->no_auto_peer) {
 576                 wpa_msg(wpa_s, MSG_INFO, "will not initiate new peer link with "
 577                         MACSTR " because of no_auto_peer", MAC2STR(addr));
 578                 return;
 579         }
 580
 581         if (conf->security == MESH_CONF_SEC_NONE)
 582                 mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 583         else
 584                 mesh_rsn_auth_sae_sta(wpa_s, sta);
 585 }
 586
 587
 588 void mesh_mpm_mgmt_rx(struct wpa_supplicant *wpa_s, struct rx_mgmt *rx_mgmt)
 589 {
 590         struct hostapd_frame_info fi;
 591
 592         os_memset(&fi, 0, sizeof(fi));
 593         fi.datarate = rx_mgmt->datarate;
 594         fi.ssi_signal = rx_mgmt->ssi_signal;
 595         ieee802_11_mgmt(wpa_s->ifmsh->bss[0], rx_mgmt->frame,
 596                         rx_mgmt->frame_len, &fi);
 597 }
 598
 599
 600 static void mesh_mpm_plink_estab(struct wpa_supplicant *wpa_s,
 601                                  struct sta_info *sta)
 602 {
 603         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 604         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 605         u8 seq[6] = {};
 606
 607         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR " established",
 608                 MAC2STR(sta->addr));
 609
 610         if (conf->security & MESH_CONF_SEC_AMPE) {
 611                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 0, 0,
 612                                 seq, sizeof(seq), sta->mtk, sizeof(sta->mtk));
 613                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 1, 0,
 614                                 seq, sizeof(seq),
 615                                 sta->mgtk, sizeof(sta->mgtk));
 616                 wpa_drv_set_key(wpa_s, WPA_ALG_IGTK, sta->addr, 4, 0,
 617                                 seq, sizeof(seq),
 618                                 sta->mgtk, sizeof(sta->mgtk));
 619
 620                 wpa_hexdump_key(MSG_DEBUG, "mtk:", sta->mtk, sizeof(sta->mtk));
 621                 wpa_hexdump_key(MSG_DEBUG, "mgtk:",
 622                                 sta->mgtk, sizeof(sta->mgtk));
 623         }
 624
 625         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_ESTAB);
 626         hapd->num_plinks++;
 627
 628         sta->flags |= WLAN_STA_ASSOC;
 629
 630         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 631
 632         /* Send ctrl event */
 633         wpa_msg_ctrl(wpa_s, MSG_INFO, MESH_PEER_CONNECTED MACSTR,
 634                      MAC2STR(sta->addr));
 635 }
 636
 637
 638 static void mesh_mpm_fsm(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 639                          enum plink_event event)
 640 {
 641         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 642         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 643         u16 reason = 0;
 644
 645         wpa_msg(wpa_s, MSG_DEBUG, "MPM " MACSTR " state %s event %s",
 646                 MAC2STR(sta->addr), mplstate[sta->plink_state],
 647                 mplevent[event]);
 648
 649         switch (sta->plink_state) {
 650         case PLINK_LISTEN:
 651                 switch (event) {
 652                 case CLS_ACPT:
 653                         mesh_mpm_fsm_restart(wpa_s, sta);
 654                         break;
 655                 case OPN_ACPT:
 656                         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_RCVD);
 657                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CONFIRM,
 658                                                    0);
 659                         break;
 660                 default:
 661                         break;
 662                 }
 663                 break;
 664         case PLINK_OPEN_SENT:
 665                 switch (event) {
 666                 case OPN_RJCT:
 667                 case CNF_RJCT:
 668                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 669                         /* fall-through */
 670                 case CLS_ACPT:
 671                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 672                         if (!reason)
 673                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 674                         eloop_register_timeout(
 675                                 conf->dot11MeshHoldingTimeout / 1000,
 676                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 677                                 plink_timer, wpa_s, sta);
 678                         mesh_mpm_send_plink_action(wpa_s, sta,
 679                                                    PLINK_CLOSE, reason);
 680                         break;
 681                 case OPN_ACPT:
 682                         /* retry timer is left untouched */
 683                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_OPEN_RCVD);
 684                         mesh_mpm_send_plink_action(wpa_s, sta,
 685                                                    PLINK_CONFIRM, 0);
 686                         break;
 687                 case CNF_ACPT:
 688                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_CNF_RCVD);
 689                         eloop_register_timeout(
 690                                 conf->dot11MeshConfirmTimeout / 1000,
 691                                 (conf->dot11MeshConfirmTimeout % 1000) * 1000,
 692                                 plink_timer, wpa_s, sta);
 693                         break;
 694                 default:
 695                         break;
 696                 }
 697                 break;
 698         case PLINK_OPEN_RCVD:
 699                 switch (event) {
 700                 case OPN_RJCT:
 701                 case CNF_RJCT:
 702                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 703                         /* fall-through */
 704                 case CLS_ACPT:
 705                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 706                         if (!reason)
 707                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 708                         eloop_register_timeout(
 709                                 conf->dot11MeshHoldingTimeout / 1000,
 710                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 711                                 plink_timer, wpa_s, sta);
 712                         sta->mpm_close_reason = reason;
 713                         mesh_mpm_send_plink_action(wpa_s, sta,
 714                                                    PLINK_CLOSE, reason);
 715                         break;
 716                 case OPN_ACPT:
 717                         mesh_mpm_send_plink_action(wpa_s, sta,
 718                                                    PLINK_CONFIRM, 0);
 719                         break;
 720                 case CNF_ACPT:
 721                         if (conf->security & MESH_CONF_SEC_AMPE)
 722                                 mesh_rsn_derive_mtk(wpa_s, sta);
 723                         mesh_mpm_plink_estab(wpa_s, sta);
 724                         break;
 725                 default:
 726                         break;
 727                 }
 728                 break;
 729         case PLINK_CNF_RCVD:
 730                 switch (event) {
 731                 case OPN_RJCT:
 732                 case CNF_RJCT:
 733                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 734                         /* fall-through */
 735                 case CLS_ACPT:
 736                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 737                         if (!reason)
 738                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 739                         eloop_register_timeout(
 740                                 conf->dot11MeshHoldingTimeout / 1000,
 741                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 742                                 plink_timer, wpa_s, sta);
 743                         sta->mpm_close_reason = reason;
 744                         mesh_mpm_send_plink_action(wpa_s, sta,
 745                                                    PLINK_CLOSE, reason);
 746                         break;
 747                 case OPN_ACPT:
 748                         mesh_mpm_plink_estab(wpa_s, sta);
 749                         mesh_mpm_send_plink_action(wpa_s, sta,
 750                                                    PLINK_CONFIRM, 0);
 751                         break;
 752                 default:
 753                         break;
 754                 }
 755                 break;
 756         case PLINK_ESTAB:
 757                 switch (event) {
 758                 case CLS_ACPT:
 759                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 760                         reason = WLAN_REASON_MESH_CLOSE_RCVD;
 761
 762                         eloop_register_timeout(
 763                                 conf->dot11MeshHoldingTimeout / 1000,
 764                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 765                                 plink_timer, wpa_s, sta);
 766                         sta->mpm_close_reason = reason;
 767
 768                         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR
 769                                 " closed with reason %d",
 770                                 MAC2STR(sta->addr), reason);
 771
 772                         wpa_msg_ctrl(wpa_s, MSG_INFO,
 773                                      MESH_PEER_DISCONNECTED MACSTR,
 774                                      MAC2STR(sta->addr));
 775
 776                         hapd->num_plinks--;
 777
 778                         mesh_mpm_send_plink_action(wpa_s, sta,
 779                                                    PLINK_CLOSE, reason);
 780                         break;
 781                 case OPN_ACPT:
 782                         mesh_mpm_send_plink_action(wpa_s, sta,
 783                                                    PLINK_CONFIRM, 0);
 784                         break;
 785                 default:
 786                         break;
 787                 }
 788                 break;
 789         case PLINK_HOLDING:
 790                 switch (event) {
 791                 case CLS_ACPT:
 792                         mesh_mpm_fsm_restart(wpa_s, sta);
 793                         break;
 794                 case OPN_ACPT:
 795                 case CNF_ACPT:
 796                 case OPN_RJCT:
 797                 case CNF_RJCT:
 798                         reason = sta->mpm_close_reason;
 799                         mesh_mpm_send_plink_action(wpa_s, sta,
 800                                                    PLINK_CLOSE, reason);
 801                         break;
 802                 default:
 803                         break;
 804                 }
 805                 break;
 806         default:
 807                 wpa_msg(wpa_s, MSG_DEBUG,
 808                         "Unsupported MPM event %s for state %s",
 809                         mplevent[event], mplstate[sta->plink_state]);
 810                 break;
 811         }
 812 }
 813
 814
 815 void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
 816                         const struct ieee80211_mgmt *mgmt, size_t len)
 817 {
 818         u8 action_field;
 819         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 820         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
 821         struct sta_info *sta;
 822         u16 plid = 0, llid = 0;
 823         enum plink_event event;
 824         struct ieee802_11_elems elems;
 825         struct mesh_peer_mgmt_ie peer_mgmt_ie;
 826         const u8 *ies;
 827         size_t ie_len;
 828         int ret;
 829
 830         if (mgmt->u.action.category != WLAN_ACTION_SELF_PROTECTED)
 831                 return;
 832
 833         action_field = mgmt->u.action.u.slf_prot_action.action;
 834         if (action_field != PLINK_OPEN &&
 835             action_field != PLINK_CONFIRM &&
 836             action_field != PLINK_CLOSE)
 837                 return;
 838
 839         ies = mgmt->u.action.u.slf_prot_action.variable;
 840         ie_len = (const u8 *) mgmt + len -
 841                 mgmt->u.action.u.slf_prot_action.variable;
 842
 843         /* at least expect mesh id and peering mgmt */
 844         if (ie_len < 2 + 2) {
 845                 wpa_printf(MSG_DEBUG,
 846                            "MPM: Ignore too short action frame %u ie_len %u",
 847                            action_field, (unsigned int) ie_len);
 848                 return;
 849         }
 850         wpa_printf(MSG_DEBUG, "MPM: Received PLINK action %u", action_field);
 851
 852         if (action_field == PLINK_OPEN || action_field == PLINK_CONFIRM) {
 853                 wpa_printf(MSG_DEBUG, "MPM: Capability 0x%x",
 854                            WPA_GET_LE16(ies));
 855                 ies += 2;       /* capability */
 856                 ie_len -= 2;
 857         }
 858         if (action_field == PLINK_CONFIRM) {
 859                 wpa_printf(MSG_DEBUG, "MPM: AID 0x%x", WPA_GET_LE16(ies));
 860                 ies += 2;       /* aid */
 861                 ie_len -= 2;
 862         }
 863
 864         /* check for mesh peering, mesh id and mesh config IEs */
 865         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
 866                 wpa_printf(MSG_DEBUG, "MPM: Failed to parse PLINK IEs");
 867                 return;
 868         }
 869         if (!elems.peer_mgmt) {
 870                 wpa_printf(MSG_DEBUG,
 871                            "MPM: No Mesh Peering Management element");
 872                 return;
 873         }
 874         if (action_field != PLINK_CLOSE) {
 875                 if (!elems.mesh_id || !elems.mesh_config) {
 876                         wpa_printf(MSG_DEBUG,
 877                                    "MPM: No Mesh ID or Mesh Configuration element");
 878                         return;
 879                 }
 880
 881                 if (!matches_local(wpa_s, &elems)) {
 882                         wpa_printf(MSG_DEBUG,
 883                                    "MPM: Mesh ID or Mesh Configuration element do not match local MBSS");
 884                         return;
 885                 }
 886         }
 887
 888         ret = mesh_mpm_parse_peer_mgmt(wpa_s, action_field,
 889                                        elems.peer_mgmt,
 890                                        elems.peer_mgmt_len,
 891                                        &peer_mgmt_ie);
 892         if (ret) {
 893                 wpa_printf(MSG_DEBUG, "MPM: Mesh parsing rejected frame");
 894                 return;
 895         }
 896
 897         /* the sender's llid is our plid and vice-versa */
 898         plid = WPA_GET_LE16(peer_mgmt_ie.llid);
 899         if (peer_mgmt_ie.plid)
 900                 llid = WPA_GET_LE16(peer_mgmt_ie.plid);
 901         wpa_printf(MSG_DEBUG, "MPM: plid=0x%x llid=0x%x", plid, llid);
 902
 903         sta = ap_get_sta(hapd, mgmt->sa);
 904         if (!sta) {
 905                 wpa_printf(MSG_DEBUG, "MPM: No STA entry for peer");
 906                 return;
 907         }
 908
 909 #ifdef CONFIG_SAE
 910         /* peer is in sae_accepted? */
 911         if (sta->sae && sta->sae->state != SAE_ACCEPTED) {
 912                 wpa_printf(MSG_DEBUG, "MPM: SAE not yet accepted for peer");
 913                 return;
 914         }
 915 #endif /* CONFIG_SAE */
 916
 917         if (!sta->my_lid)
 918                 mesh_mpm_init_link(wpa_s, sta);
 919
 920         if ((mconf->security & MESH_CONF_SEC_AMPE) &&
 921             mesh_rsn_process_ampe(wpa_s, sta, &elems,
 922                                   &mgmt->u.action.category,
 923                                   ies, ie_len)) {
 924                 wpa_printf(MSG_DEBUG, "MPM: RSN process rejected frame");
 925                 return;
 926         }
 927
 928         if (sta->plink_state == PLINK_BLOCKED) {
 929                 wpa_printf(MSG_DEBUG, "MPM: PLINK_BLOCKED");
 930                 return;
 931         }
 932
 933         /* Now we will figure out the appropriate event... */
 934         switch (action_field) {
 935         case PLINK_OPEN:
 936                 if (!plink_free_count(hapd) ||
 937                     (sta->peer_lid && sta->peer_lid != plid)) {
 938                         event = OPN_IGNR;
 939                 } else {
 940                         sta->peer_lid = plid;
 941                         event = OPN_ACPT;
 942                 }
 943                 break;
 944         case PLINK_CONFIRM:
 945                 if (!plink_free_count(hapd) ||
 946                     sta->my_lid != llid ||
 947                     (sta->peer_lid && sta->peer_lid != plid)) {
 948                         event = CNF_IGNR;
 949                 } else {
 950                         if (!sta->peer_lid)
 951                                 sta->peer_lid = plid;
 952                         event = CNF_ACPT;
 953                 }
 954                 break;
 955         case PLINK_CLOSE:
 956                 if (sta->plink_state == PLINK_ESTAB)
 957                         /* Do not check for llid or plid. This does not
 958                          * follow the standard but since multiple plinks
 959                          * per cand are not supported, it is necessary in
 960                          * order to avoid a livelock when MP A sees an
 961                          * establish peer link to MP B but MP B does not
 962                          * see it. This can be caused by a timeout in
 963                          * B's peer link establishment or B being
 964                          * restarted.
 965                          */
 966                         event = CLS_ACPT;
 967                 else if (sta->peer_lid != plid)
 968                         event = CLS_IGNR;
 969                 else if (peer_mgmt_ie.plid && sta->my_lid != llid)
 970                         event = CLS_IGNR;
 971                 else
 972                         event = CLS_ACPT;
 973                 break;
 974         }
 975         mesh_mpm_fsm(wpa_s, sta, event);
 976 }
 977
 978
 979 /* called by ap_free_sta */
 980 void mesh_mpm_free_sta(struct sta_info *sta)
 981 {
 982         eloop_cancel_timeout(plink_timer, ELOOP_ALL_CTX, sta);
 983         eloop_cancel_timeout(mesh_auth_timer, ELOOP_ALL_CTX, sta);
 984 }