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
  21 /* TODO make configurable */
  22 #define dot11MeshMaxRetries 10
  23 #define dot11MeshRetryTimeout 1
  24 #define dot11MeshConfirmTimeout 1
  25 #define dot11MeshHoldingTimeout 1
  26
  27 struct mesh_peer_mgmt_ie {
  28         const u8 *proto_id;
  29         const u8 *llid;
  30         const u8 *plid;
  31         const u8 *reason;
  32         const u8 *pmk;
  33 };
  34
  35 static void plink_timer(void *eloop_ctx, void *user_data);
  36
  37
  38 enum plink_event {
  39         PLINK_UNDEFINED,
  40         OPN_ACPT,
  41         OPN_RJCT,
  42         OPN_IGNR,
  43         CNF_ACPT,
  44         CNF_RJCT,
  45         CNF_IGNR,
  46         CLS_ACPT,
  47         CLS_IGNR
  48 };
  49
  50 static const char * const mplstate[] = {
  51         [PLINK_LISTEN] = "LISTEN",
  52         [PLINK_OPEN_SENT] = "OPEN_SENT",
  53         [PLINK_OPEN_RCVD] = "OPEN_RCVD",
  54         [PLINK_CNF_RCVD] = "CNF_RCVD",
  55         [PLINK_ESTAB] = "ESTAB",
  56         [PLINK_HOLDING] = "HOLDING",
  57         [PLINK_BLOCKED] = "BLOCKED"
  58 };
  59
  60 static const char * const mplevent[] = {
  61         [PLINK_UNDEFINED] = "UNDEFINED",
  62         [OPN_ACPT] = "OPN_ACPT",
  63         [OPN_RJCT] = "OPN_RJCT",
  64         [OPN_IGNR] = "OPN_IGNR",
  65         [CNF_ACPT] = "CNF_ACPT",
  66         [CNF_RJCT] = "CNF_RJCT",
  67         [CNF_IGNR] = "CNF_IGNR",
  68         [CLS_ACPT] = "CLS_ACPT",
  69         [CLS_IGNR] = "CLS_IGNR"
  70 };
  71
  72
  73 static int mesh_mpm_parse_peer_mgmt(struct wpa_supplicant *wpa_s,
  74                                     u8 action_field,
  75                                     const u8 *ie, size_t len,
  76                                     struct mesh_peer_mgmt_ie *mpm_ie)
  77 {
  78         os_memset(mpm_ie, 0, sizeof(*mpm_ie));
  79
  80         /* remove optional PMK at end */
  81         if (len >= 16) {
  82                 len -= 16;
  83                 mpm_ie->pmk = ie + len - 16;
  84         }
  85
  86         if ((action_field == PLINK_OPEN && len != 4) ||
  87             (action_field == PLINK_CONFIRM && len != 6) ||
  88             (action_field == PLINK_CLOSE && len != 6 && len != 8)) {
  89                 wpa_msg(wpa_s, MSG_DEBUG, "MPM: Invalid peer mgmt ie");
  90                 return -1;
  91         }
  92
  93         /* required fields */
  94         if (len < 4)
  95                 return -1;
  96         mpm_ie->proto_id = ie;
  97         mpm_ie->llid = ie + 2;
  98         ie += 4;
  99         len -= 4;
 100
 101         /* close reason is always present at end for close */
 102         if (action_field == PLINK_CLOSE) {
 103                 if (len < 2)
 104                         return -1;
 105                 mpm_ie->reason = ie + len - 2;
 106                 len -= 2;
 107         }
 108
 109         /* plid, present for confirm, and possibly close */
 110         if (len)
 111                 mpm_ie->plid = ie;
 112
 113         return 0;
 114 }
 115
 116
 117 static int plink_free_count(struct hostapd_data *hapd)
 118 {
 119         if (hapd->max_plinks > hapd->num_plinks)
 120                 return hapd->max_plinks - hapd->num_plinks;
 121         return 0;
 122 }
 123
 124
 125 static u16 copy_supp_rates(struct wpa_supplicant *wpa_s,
 126                            struct sta_info *sta,
 127                            struct ieee802_11_elems *elems)
 128 {
 129         if (!elems->supp_rates) {
 130                 wpa_msg(wpa_s, MSG_ERROR, "no supported rates from " MACSTR,
 131                         MAC2STR(sta->addr));
 132                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 133         }
 134
 135         if (elems->supp_rates_len + elems->ext_supp_rates_len >
 136             sizeof(sta->supported_rates)) {
 137                 wpa_msg(wpa_s, MSG_ERROR,
 138                         "Invalid supported rates element length " MACSTR
 139                         " %d+%d", MAC2STR(sta->addr), elems->supp_rates_len,
 140                         elems->ext_supp_rates_len);
 141                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 142         }
 143
 144         sta->supported_rates_len = merge_byte_arrays(
 145                 sta->supported_rates, sizeof(sta->supported_rates),
 146                 elems->supp_rates, elems->supp_rates_len,
 147                 elems->ext_supp_rates, elems->ext_supp_rates_len);
 148
 149         return WLAN_STATUS_SUCCESS;
 150 }
 151
 152
 153 /* return true if elems from a neighbor match this MBSS */
 154 static Boolean matches_local(struct wpa_supplicant *wpa_s,
 155                              struct ieee802_11_elems *elems)
 156 {
 157         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
 158
 159         if (elems->mesh_config_len < 5)
 160                 return FALSE;
 161
 162         return (mconf->meshid_len == elems->mesh_id_len &&
 163                 os_memcmp(mconf->meshid, elems->mesh_id,
 164                           elems->mesh_id_len) == 0 &&
 165                 mconf->mesh_pp_id == elems->mesh_config[0] &&
 166                 mconf->mesh_pm_id == elems->mesh_config[1] &&
 167                 mconf->mesh_cc_id == elems->mesh_config[2] &&
 168                 mconf->mesh_sp_id == elems->mesh_config[3] &&
 169                 mconf->mesh_auth_id == elems->mesh_config[4]);
 170 }
 171
 172
 173 /* check if local link id is already used with another peer */
 174 static Boolean llid_in_use(struct wpa_supplicant *wpa_s, u16 llid)
 175 {
 176         struct sta_info *sta;
 177         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 178
 179         for (sta = hapd->sta_list; sta; sta = sta->next) {
 180                 if (sta->my_lid == llid)
 181                         return TRUE;
 182         }
 183
 184         return FALSE;
 185 }
 186
 187
 188 /* generate an llid for a link and set to initial state */
 189 static void mesh_mpm_init_link(struct wpa_supplicant *wpa_s,
 190                                struct sta_info *sta)
 191 {
 192         u16 llid;
 193
 194         do {
 195                 if (os_get_random((u8 *) &llid, sizeof(llid)) < 0)
 196                         continue;
 197         } while (!llid || llid_in_use(wpa_s, llid));
 198
 199         sta->my_lid = llid;
 200         sta->peer_lid = 0;
 201         sta->plink_state = PLINK_LISTEN;
 202 }
 203
 204
 205 static void mesh_mpm_send_plink_action(struct wpa_supplicant *wpa_s,
 206                                        struct sta_info *sta,
 207                                        enum plink_action_field type,
 208                                        u16 close_reason)
 209 {
 210         struct wpabuf *buf;
 211         struct hostapd_iface *ifmsh = wpa_s->ifmsh;
 212         struct hostapd_data *bss = ifmsh->bss[0];
 213         struct mesh_conf *conf = ifmsh->mconf;
 214         u8 supp_rates[2 + 2 + 32];
 215         u8 *pos;
 216         u8 ie_len, add_plid = 0;
 217         int ret;
 218         int ampe = conf->security & MESH_CONF_SEC_AMPE;
 219
 220         if (!sta)
 221                 return;
 222
 223         buf = wpabuf_alloc(2 +      /* capability info */
 224                            2 +      /* AID */
 225                            2 + 8 +  /* supported rates */
 226                            2 + (32 - 8) +
 227                            2 + 32 + /* mesh ID */
 228                            2 + 7 +  /* mesh config */
 229                            2 + 26 + /* HT capabilities */
 230                            2 + 22 + /* HT operation */
 231                            2 + 23 + /* peering management */
 232                            2 + 96 + /* AMPE */
 233                            2 + 16); /* MIC */
 234         if (!buf)
 235                 return;
 236
 237         wpabuf_put_u8(buf, WLAN_ACTION_SELF_PROTECTED);
 238         wpabuf_put_u8(buf, type);
 239
 240         if (type != PLINK_CLOSE) {
 241                 /* capability info */
 242                 wpabuf_put_le16(buf, ampe ? IEEE80211_CAP_PRIVACY : 0);
 243
 244                 if (type == PLINK_CONFIRM)
 245                         wpabuf_put_le16(buf, sta->peer_lid);
 246
 247                 /* IE: supp + ext. supp rates */
 248                 pos = hostapd_eid_supp_rates(bss, supp_rates);
 249                 pos = hostapd_eid_ext_supp_rates(bss, pos);
 250                 wpabuf_put_data(buf, supp_rates, pos - supp_rates);
 251
 252                 /* IE: Mesh ID */
 253                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 254                 wpabuf_put_u8(buf, conf->meshid_len);
 255                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 256
 257                 /* IE: mesh conf */
 258                 wpabuf_put_u8(buf, WLAN_EID_MESH_CONFIG);
 259                 wpabuf_put_u8(buf, 7);
 260                 wpabuf_put_u8(buf, conf->mesh_pp_id);
 261                 wpabuf_put_u8(buf, conf->mesh_pm_id);
 262                 wpabuf_put_u8(buf, conf->mesh_cc_id);
 263                 wpabuf_put_u8(buf, conf->mesh_sp_id);
 264                 wpabuf_put_u8(buf, conf->mesh_auth_id);
 265                 /* TODO: formation info */
 266                 wpabuf_put_u8(buf, 0);
 267                 /* always forwarding & accepting plinks for now */
 268                 wpabuf_put_u8(buf, 0x1 | 0x8);
 269         } else {        /* Peer closing frame */
 270                 /* IE: Mesh ID */
 271                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 272                 wpabuf_put_u8(buf, conf->meshid_len);
 273                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 274         }
 275
 276         /* IE: Mesh Peering Management element */
 277         ie_len = 4;
 278         if (ampe)
 279                 ie_len += PMKID_LEN;
 280         switch (type) {
 281         case PLINK_OPEN:
 282                 break;
 283         case PLINK_CONFIRM:
 284                 ie_len += 2;
 285                 add_plid = 1;
 286                 break;
 287         case PLINK_CLOSE:
 288                 ie_len += 2;
 289                 add_plid = 1;
 290                 ie_len += 2; /* reason code */
 291                 break;
 292         }
 293
 294         wpabuf_put_u8(buf, WLAN_EID_PEER_MGMT);
 295         wpabuf_put_u8(buf, ie_len);
 296         /* peering protocol */
 297         if (ampe)
 298                 wpabuf_put_le16(buf, 1);
 299         else
 300                 wpabuf_put_le16(buf, 0);
 301         wpabuf_put_le16(buf, sta->my_lid);
 302         if (add_plid)
 303                 wpabuf_put_le16(buf, sta->peer_lid);
 304         if (type == PLINK_CLOSE)
 305                 wpabuf_put_le16(buf, close_reason);
 306
 307         /* TODO HT IEs */
 308
 309         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0,
 310                                   sta->addr, wpa_s->own_addr, wpa_s->own_addr,
 311                                   wpabuf_head(buf), wpabuf_len(buf), 0);
 312         if (ret < 0)
 313                 wpa_msg(wpa_s, MSG_INFO,
 314                         "Mesh MPM: failed to send peering frame");
 315
 316         wpabuf_free(buf);
 317 }
 318
 319
 320 /* configure peering state in ours and driver's station entry */
 321 static void
 322 wpa_mesh_set_plink_state(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 323                          enum mesh_plink_state state)
 324 {
 325         struct hostapd_sta_add_params params;
 326         int ret;
 327
 328         sta->plink_state = state;
 329
 330         os_memset(&params, 0, sizeof(params));
 331         params.addr = sta->addr;
 332         params.plink_state = state;
 333         params.set = 1;
 334
 335         wpa_msg(wpa_s, MSG_DEBUG, "MPM set " MACSTR " into %s",
 336                 MAC2STR(sta->addr), mplstate[state]);
 337         ret = wpa_drv_sta_add(wpa_s, &params);
 338         if (ret) {
 339                 wpa_msg(wpa_s, MSG_ERROR, "Driver failed to set " MACSTR
 340                         ": %d", MAC2STR(sta->addr), ret);
 341         }
 342 }
 343
 344
 345 static void mesh_mpm_fsm_restart(struct wpa_supplicant *wpa_s,
 346                                  struct sta_info *sta)
 347 {
 348         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 349
 350         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 351
 352         if (sta->mpm_close_reason == WLAN_REASON_MESH_CLOSE_RCVD) {
 353                 ap_free_sta(hapd, sta);
 354                 return;
 355         }
 356
 357         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_LISTEN);
 358         sta->my_lid = sta->peer_lid = sta->mpm_close_reason = 0;
 359         sta->mpm_retries = 0;
 360 }
 361
 362
 363 static void plink_timer(void *eloop_ctx, void *user_data)
 364 {
 365         struct wpa_supplicant *wpa_s = eloop_ctx;
 366         struct sta_info *sta = user_data;
 367         u16 reason = 0;
 368
 369         switch (sta->plink_state) {
 370         case PLINK_OPEN_RCVD:
 371         case PLINK_OPEN_SENT:
 372                 /* retry timer */
 373                 if (sta->mpm_retries < dot11MeshMaxRetries) {
 374                         eloop_register_timeout(dot11MeshRetryTimeout, 0,
 375                                                plink_timer, wpa_s, sta);
 376                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 377                         sta->mpm_retries++;
 378                         break;
 379                 }
 380                 reason = WLAN_REASON_MESH_MAX_RETRIES;
 381                 /* fall through on else */
 382
 383         case PLINK_CNF_RCVD:
 384                 /* confirm timer */
 385                 if (!reason)
 386                         reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
 387                 sta->plink_state = PLINK_HOLDING;
 388                 eloop_register_timeout(dot11MeshHoldingTimeout, 0,
 389                                        plink_timer, wpa_s, sta);
 390                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 391                 break;
 392         case PLINK_HOLDING:
 393                 /* holding timer */
 394                 mesh_mpm_fsm_restart(wpa_s, sta);
 395                 break;
 396         default:
 397                 break;
 398         }
 399 }
 400
 401
 402 /* initiate peering with station */
 403 static void
 404 mesh_mpm_plink_open(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 405                     enum mesh_plink_state next_state)
 406 {
 407         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 408         eloop_register_timeout(dot11MeshRetryTimeout, 0, plink_timer,
 409                                wpa_s, sta);
 410         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 411         wpa_mesh_set_plink_state(wpa_s, sta, next_state);
 412 }
 413
 414
 415 int mesh_mpm_plink_close(struct hostapd_data *hapd,
 416                          struct sta_info *sta, void *ctx)
 417 {
 418         struct wpa_supplicant *wpa_s = ctx;
 419         int reason = WLAN_REASON_MESH_PEERING_CANCELLED;
 420
 421         if (sta) {
 422                 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 423                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 424                 wpa_printf(MSG_DEBUG, "MPM closing plink sta=" MACSTR,
 425                            MAC2STR(sta->addr));
 426                 eloop_cancel_timeout(plink_timer, wpa_s, sta);
 427                 return 0;
 428         }
 429
 430         return 1;
 431 }
 432
 433
 434 void mesh_mpm_deinit(struct wpa_supplicant *wpa_s, struct hostapd_iface *ifmsh)
 435 {
 436         struct hostapd_data *hapd = ifmsh->bss[0];
 437
 438         /* notify peers we're leaving */
 439         ap_for_each_sta(hapd, mesh_mpm_plink_close, wpa_s);
 440
 441         hapd->num_plinks = 0;
 442         hostapd_free_stas(hapd);
 443 }
 444
 445
 446 /* for mesh_rsn to indicate this peer has completed authentication, and we're
 447  * ready to start AMPE */
 448 void mesh_mpm_auth_peer(struct wpa_supplicant *wpa_s, const u8 *addr)
 449 {
 450         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 451         struct hostapd_sta_add_params params;
 452         struct sta_info *sta;
 453         int ret;
 454
 455         sta = ap_get_sta(data, addr);
 456         if (!sta) {
 457                 wpa_msg(wpa_s, MSG_DEBUG, "no such mesh peer");
 458                 return;
 459         }
 460
 461         /* TODO: Should do nothing if this STA is already authenticated, but
 462          * the AP code already sets this flag. */
 463         sta->flags |= WLAN_STA_AUTH;
 464
 465         os_memset(&params, 0, sizeof(params));
 466         params.addr = sta->addr;
 467         params.flags = WPA_STA_AUTHENTICATED | WPA_STA_AUTHORIZED;
 468         params.set = 1;
 469
 470         wpa_msg(wpa_s, MSG_DEBUG, "MPM authenticating " MACSTR,
 471                 MAC2STR(sta->addr));
 472         ret = wpa_drv_sta_add(wpa_s, &params);
 473         if (ret) {
 474                 wpa_msg(wpa_s, MSG_ERROR,
 475                         "Driver failed to set " MACSTR ": %d",
 476                         MAC2STR(sta->addr), ret);
 477         }
 478
 479         if (!sta->my_lid)
 480                 mesh_mpm_init_link(wpa_s, sta);
 481
 482         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 483 }
 484
 485
 486 void wpa_mesh_new_mesh_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 487                             struct ieee802_11_elems *elems)
 488 {
 489         struct hostapd_sta_add_params params;
 490         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 491         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 492         struct sta_info *sta;
 493         int ret = 0;
 494
 495         sta = ap_get_sta(data, addr);
 496         if (!sta) {
 497                 sta = ap_sta_add(data, addr);
 498                 if (!sta)
 499                         return;
 500         }
 501
 502         /* initialize sta */
 503         if (copy_supp_rates(wpa_s, sta, elems))
 504                 return;
 505
 506         mesh_mpm_init_link(wpa_s, sta);
 507
 508         /* insert into driver */
 509         os_memset(&params, 0, sizeof(params));
 510         params.supp_rates = sta->supported_rates;
 511         params.supp_rates_len = sta->supported_rates_len;
 512         params.addr = addr;
 513         params.plink_state = sta->plink_state;
 514         params.aid = sta->peer_lid;
 515         params.listen_interval = 100;
 516         /* TODO: HT capabilities */
 517         params.flags |= WPA_STA_WMM;
 518         params.flags_mask |= WPA_STA_AUTHENTICATED;
 519         if (conf->security == MESH_CONF_SEC_NONE) {
 520                 params.flags |= WPA_STA_AUTHORIZED;
 521                 params.flags |= WPA_STA_AUTHENTICATED;
 522         } else {
 523                 sta->flags |= WLAN_STA_MFP;
 524                 params.flags |= WPA_STA_MFP;
 525         }
 526
 527         ret = wpa_drv_sta_add(wpa_s, &params);
 528         if (ret) {
 529                 wpa_msg(wpa_s, MSG_ERROR,
 530                         "Driver failed to insert " MACSTR ": %d",
 531                         MAC2STR(addr), ret);
 532                 return;
 533         }
 534
 535         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 536 }
 537
 538
 539 void mesh_mpm_mgmt_rx(struct wpa_supplicant *wpa_s, struct rx_mgmt *rx_mgmt)
 540 {
 541         struct hostapd_frame_info fi;
 542
 543         os_memset(&fi, 0, sizeof(fi));
 544         fi.datarate = rx_mgmt->datarate;
 545         fi.ssi_signal = rx_mgmt->ssi_signal;
 546         ieee802_11_mgmt(wpa_s->ifmsh->bss[0], rx_mgmt->frame,
 547                         rx_mgmt->frame_len, &fi);
 548 }
 549
 550
 551 static void mesh_mpm_plink_estab(struct wpa_supplicant *wpa_s,
 552                                  struct sta_info *sta)
 553 {
 554         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 555
 556         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR " established",
 557                 MAC2STR(sta->addr));
 558
 559         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_ESTAB);
 560         hapd->num_plinks++;
 561
 562         sta->flags |= WLAN_STA_ASSOC;
 563
 564         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 565
 566         /* Send ctrl event */
 567         wpa_msg_ctrl(wpa_s, MSG_INFO, MESH_PEER_CONNECTED MACSTR,
 568                      MAC2STR(sta->addr));
 569 }
 570
 571
 572 static void mesh_mpm_fsm(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 573                          enum plink_event event)
 574 {
 575         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 576         u16 reason = 0;
 577
 578         wpa_msg(wpa_s, MSG_DEBUG, "MPM " MACSTR " state %s event %s",
 579                 MAC2STR(sta->addr), mplstate[sta->plink_state],
 580                 mplevent[event]);
 581
 582         switch (sta->plink_state) {
 583         case PLINK_LISTEN:
 584                 switch (event) {
 585                 case CLS_ACPT:
 586                         mesh_mpm_fsm_restart(wpa_s, sta);
 587                         break;
 588                 case OPN_ACPT:
 589                         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_RCVD);
 590                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CONFIRM,
 591                                                    0);
 592                         break;
 593                 default:
 594                         break;
 595                 }
 596                 break;
 597         case PLINK_OPEN_SENT:
 598                 switch (event) {
 599                 case OPN_RJCT:
 600                 case CNF_RJCT:
 601                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 602                         /* fall-through */
 603                 case CLS_ACPT:
 604                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 605                         if (!reason)
 606                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 607                         eloop_register_timeout(dot11MeshHoldingTimeout, 0,
 608                                                plink_timer, wpa_s, sta);
 609                         mesh_mpm_send_plink_action(wpa_s, sta,
 610                                                    PLINK_CLOSE, reason);
 611                         break;
 612                 case OPN_ACPT:
 613                         /* retry timer is left untouched */
 614                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_OPEN_RCVD);
 615                         mesh_mpm_send_plink_action(wpa_s, sta,
 616                                                    PLINK_CONFIRM, 0);
 617                         break;
 618                 case CNF_ACPT:
 619                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_CNF_RCVD);
 620                         eloop_register_timeout(dot11MeshConfirmTimeout, 0,
 621                                                plink_timer, wpa_s, sta);
 622                         break;
 623                 default:
 624                         break;
 625                 }
 626                 break;
 627         case PLINK_OPEN_RCVD:
 628                 switch (event) {
 629                 case OPN_RJCT:
 630                 case CNF_RJCT:
 631                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 632                         /* fall-through */
 633                 case CLS_ACPT:
 634                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 635                         if (!reason)
 636                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 637                         eloop_register_timeout(dot11MeshHoldingTimeout, 0,
 638                                                plink_timer, wpa_s, sta);
 639                         sta->mpm_close_reason = reason;
 640                         mesh_mpm_send_plink_action(wpa_s, sta,
 641                                                    PLINK_CLOSE, reason);
 642                         break;
 643                 case OPN_ACPT:
 644                         mesh_mpm_send_plink_action(wpa_s, sta,
 645                                                    PLINK_CONFIRM, 0);
 646                         break;
 647                 case CNF_ACPT:
 648                         mesh_mpm_plink_estab(wpa_s, sta);
 649                         break;
 650                 default:
 651                         break;
 652                 }
 653                 break;
 654         case PLINK_CNF_RCVD:
 655                 switch (event) {
 656                 case OPN_RJCT:
 657                 case CNF_RJCT:
 658                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 659                         /* fall-through */
 660                 case CLS_ACPT:
 661                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 662                         if (!reason)
 663                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 664                         eloop_register_timeout(dot11MeshHoldingTimeout, 0,
 665                                                plink_timer, wpa_s, sta);
 666                         sta->mpm_close_reason = reason;
 667                         mesh_mpm_send_plink_action(wpa_s, sta,
 668                                                    PLINK_CLOSE, reason);
 669                         break;
 670                 case OPN_ACPT:
 671                         mesh_mpm_plink_estab(wpa_s, sta);
 672                         mesh_mpm_send_plink_action(wpa_s, sta,
 673                                                    PLINK_CONFIRM, 0);
 674                         break;
 675                 default:
 676                         break;
 677                 }
 678                 break;
 679         case PLINK_ESTAB:
 680                 switch (event) {
 681                 case CLS_ACPT:
 682                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 683                         reason = WLAN_REASON_MESH_CLOSE_RCVD;
 684
 685                         eloop_register_timeout(dot11MeshHoldingTimeout, 0,
 686                                                plink_timer, wpa_s, sta);
 687                         sta->mpm_close_reason = reason;
 688
 689                         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR
 690                                 " closed with reason %d",
 691                                 MAC2STR(sta->addr), reason);
 692
 693                         wpa_msg_ctrl(wpa_s, MSG_INFO,
 694                                      MESH_PEER_DISCONNECTED MACSTR,
 695                                      MAC2STR(sta->addr));
 696
 697                         hapd->num_plinks--;
 698
 699                         mesh_mpm_send_plink_action(wpa_s, sta,
 700                                                    PLINK_CLOSE, reason);
 701                         break;
 702                 case OPN_ACPT:
 703                         mesh_mpm_send_plink_action(wpa_s, sta,
 704                                                    PLINK_CONFIRM, 0);
 705                         break;
 706                 default:
 707                         break;
 708                 }
 709                 break;
 710         case PLINK_HOLDING:
 711                 switch (event) {
 712                 case CLS_ACPT:
 713                         mesh_mpm_fsm_restart(wpa_s, sta);
 714                         break;
 715                 case OPN_ACPT:
 716                 case CNF_ACPT:
 717                 case OPN_RJCT:
 718                 case CNF_RJCT:
 719                         reason = sta->mpm_close_reason;
 720                         mesh_mpm_send_plink_action(wpa_s, sta,
 721                                                    PLINK_CLOSE, reason);
 722                         break;
 723                 default:
 724                         break;
 725                 }
 726                 break;
 727         default:
 728                 wpa_msg(wpa_s, MSG_DEBUG,
 729                         "Unsupported MPM event %s for state %s",
 730                         mplevent[event], mplstate[sta->plink_state]);
 731                 break;
 732         }
 733 }
 734
 735
 736 void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
 737                         const struct ieee80211_mgmt *mgmt, size_t len)
 738 {
 739         u8 action_field;
 740         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 741         struct sta_info *sta;
 742         u16 plid = 0, llid = 0;
 743         enum plink_event event;
 744         struct ieee802_11_elems elems;
 745         struct mesh_peer_mgmt_ie peer_mgmt_ie;
 746         const u8 *ies;
 747         size_t ie_len;
 748         int ret;
 749
 750         if (mgmt->u.action.category != WLAN_ACTION_SELF_PROTECTED)
 751                 return;
 752
 753         action_field = mgmt->u.action.u.slf_prot_action.action;
 754
 755         ies = mgmt->u.action.u.slf_prot_action.variable;
 756         ie_len = (const u8 *) mgmt + len -
 757                 mgmt->u.action.u.slf_prot_action.variable;
 758
 759         /* at least expect mesh id and peering mgmt */
 760         if (ie_len < 2 + 2)
 761                 return;
 762
 763         if (action_field == PLINK_OPEN || action_field == PLINK_CONFIRM) {
 764                 ies += 2;       /* capability */
 765                 ie_len -= 2;
 766         }
 767         if (action_field == PLINK_CONFIRM) {
 768                 ies += 2;       /* aid */
 769                 ie_len -= 2;
 770         }
 771
 772         /* check for mesh peering, mesh id and mesh config IEs */
 773         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed)
 774                 return;
 775         if (!elems.peer_mgmt)
 776                 return;
 777         if ((action_field != PLINK_CLOSE) &&
 778             (!elems.mesh_id || !elems.mesh_config))
 779                 return;
 780
 781         if (action_field != PLINK_CLOSE && !matches_local(wpa_s, &elems))
 782                 return;
 783
 784         ret = mesh_mpm_parse_peer_mgmt(wpa_s, action_field,
 785                                        elems.peer_mgmt,
 786                                        elems.peer_mgmt_len,
 787                                        &peer_mgmt_ie);
 788         if (ret)
 789                 return;
 790
 791         /* the sender's llid is our plid and vice-versa */
 792         plid = WPA_GET_LE16(peer_mgmt_ie.llid);
 793         if (peer_mgmt_ie.plid)
 794                 llid = WPA_GET_LE16(peer_mgmt_ie.plid);
 795
 796         sta = ap_get_sta(hapd, mgmt->sa);
 797         if (!sta)
 798                 return;
 799
 800         if (!sta->my_lid)
 801                 mesh_mpm_init_link(wpa_s, sta);
 802
 803         if (sta->plink_state == PLINK_BLOCKED)
 804                 return;
 805
 806         /* Now we will figure out the appropriate event... */
 807         switch (action_field) {
 808         case PLINK_OPEN:
 809                 if (!plink_free_count(hapd) ||
 810                     (sta->peer_lid && sta->peer_lid != plid)) {
 811                         event = OPN_IGNR;
 812                 } else {
 813                         sta->peer_lid = plid;
 814                         event = OPN_ACPT;
 815                 }
 816                 break;
 817         case PLINK_CONFIRM:
 818                 if (!plink_free_count(hapd) ||
 819                     sta->my_lid != llid ||
 820                     (sta->peer_lid && sta->peer_lid != plid)) {
 821                         event = CNF_IGNR;
 822                 } else {
 823                         if (!sta->peer_lid)
 824                                 sta->peer_lid = plid;
 825                         event = CNF_ACPT;
 826                 }
 827                 break;
 828         case PLINK_CLOSE:
 829                 if (sta->plink_state == PLINK_ESTAB)
 830                         /* Do not check for llid or plid. This does not
 831                          * follow the standard but since multiple plinks
 832                          * per cand are not supported, it is necessary in
 833                          * order to avoid a livelock when MP A sees an
 834                          * establish peer link to MP B but MP B does not
 835                          * see it. This can be caused by a timeout in
 836                          * B's peer link establishment or B being
 837                          * restarted.
 838                          */
 839                         event = CLS_ACPT;
 840                 else if (sta->peer_lid != plid)
 841                         event = CLS_IGNR;
 842                 else if (peer_mgmt_ie.plid && sta->my_lid != llid)
 843                         event = CLS_IGNR;
 844                 else
 845                         event = CLS_ACPT;
 846                 break;
 847         default:
 848                 wpa_msg(wpa_s, MSG_ERROR,
 849                         "Mesh plink: unknown frame subtype");
 850                 return;
 851         }
 852         mesh_mpm_fsm(wpa_s, sta, event);
 853 }