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 /* TODO make configurable */
  23 #define dot11MeshMaxRetries 10
  24 #define dot11MeshRetryTimeout 1
  25 #define dot11MeshConfirmTimeout 1
  26 #define dot11MeshHoldingTimeout 1
  27
  28 struct mesh_peer_mgmt_ie {
  29         const u8 *proto_id;
  30         const u8 *llid;
  31         const u8 *plid;
  32         const u8 *reason;
  33         const u8 *pmk;
  34 };
  35
  36 static void plink_timer(void *eloop_ctx, void *user_data);
  37
  38
  39 enum plink_event {
  40         PLINK_UNDEFINED,
  41         OPN_ACPT,
  42         OPN_RJCT,
  43         OPN_IGNR,
  44         CNF_ACPT,
  45         CNF_RJCT,
  46         CNF_IGNR,
  47         CLS_ACPT,
  48         CLS_IGNR
  49 };
  50
  51 static const char * const mplstate[] = {
  52         [PLINK_LISTEN] = "LISTEN",
  53         [PLINK_OPEN_SENT] = "OPEN_SENT",
  54         [PLINK_OPEN_RCVD] = "OPEN_RCVD",
  55         [PLINK_CNF_RCVD] = "CNF_RCVD",
  56         [PLINK_ESTAB] = "ESTAB",
  57         [PLINK_HOLDING] = "HOLDING",
  58         [PLINK_BLOCKED] = "BLOCKED"
  59 };
  60
  61 static const char * const mplevent[] = {
  62         [PLINK_UNDEFINED] = "UNDEFINED",
  63         [OPN_ACPT] = "OPN_ACPT",
  64         [OPN_RJCT] = "OPN_RJCT",
  65         [OPN_IGNR] = "OPN_IGNR",
  66         [CNF_ACPT] = "CNF_ACPT",
  67         [CNF_RJCT] = "CNF_RJCT",
  68         [CNF_IGNR] = "CNF_IGNR",
  69         [CLS_ACPT] = "CLS_ACPT",
  70         [CLS_IGNR] = "CLS_IGNR"
  71 };
  72
  73
  74 static int mesh_mpm_parse_peer_mgmt(struct wpa_supplicant *wpa_s,
  75                                     u8 action_field,
  76                                     const u8 *ie, size_t len,
  77                                     struct mesh_peer_mgmt_ie *mpm_ie)
  78 {
  79         os_memset(mpm_ie, 0, sizeof(*mpm_ie));
  80
  81         /* remove optional PMK at end */
  82         if (len >= 16) {
  83                 len -= 16;
  84                 mpm_ie->pmk = ie + len - 16;
  85         }
  86
  87         if ((action_field == PLINK_OPEN && len != 4) ||
  88             (action_field == PLINK_CONFIRM && len != 6) ||
  89             (action_field == PLINK_CLOSE && len != 6 && len != 8)) {
  90                 wpa_msg(wpa_s, MSG_DEBUG, "MPM: Invalid peer mgmt ie");
  91                 return -1;
  92         }
  93
  94         /* required fields */
  95         if (len < 4)
  96                 return -1;
  97         mpm_ie->proto_id = ie;
  98         mpm_ie->llid = ie + 2;
  99         ie += 4;
 100         len -= 4;
 101
 102         /* close reason is always present at end for close */
 103         if (action_field == PLINK_CLOSE) {
 104                 if (len < 2)
 105                         return -1;
 106                 mpm_ie->reason = ie + len - 2;
 107                 len -= 2;
 108         }
 109
 110         /* plid, present for confirm, and possibly close */
 111         if (len)
 112                 mpm_ie->plid = ie;
 113
 114         return 0;
 115 }
 116
 117
 118 static int plink_free_count(struct hostapd_data *hapd)
 119 {
 120         if (hapd->max_plinks > hapd->num_plinks)
 121                 return hapd->max_plinks - hapd->num_plinks;
 122         return 0;
 123 }
 124
 125
 126 static u16 copy_supp_rates(struct wpa_supplicant *wpa_s,
 127                            struct sta_info *sta,
 128                            struct ieee802_11_elems *elems)
 129 {
 130         if (!elems->supp_rates) {
 131                 wpa_msg(wpa_s, MSG_ERROR, "no supported rates from " MACSTR,
 132                         MAC2STR(sta->addr));
 133                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 134         }
 135
 136         if (elems->supp_rates_len + elems->ext_supp_rates_len >
 137             sizeof(sta->supported_rates)) {
 138                 wpa_msg(wpa_s, MSG_ERROR,
 139                         "Invalid supported rates element length " MACSTR
 140                         " %d+%d", MAC2STR(sta->addr), elems->supp_rates_len,
 141                         elems->ext_supp_rates_len);
 142                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 143         }
 144
 145         sta->supported_rates_len = merge_byte_arrays(
 146                 sta->supported_rates, sizeof(sta->supported_rates),
 147                 elems->supp_rates, elems->supp_rates_len,
 148                 elems->ext_supp_rates, elems->ext_supp_rates_len);
 149
 150         return WLAN_STATUS_SUCCESS;
 151 }
 152
 153
 154 /* return true if elems from a neighbor match this MBSS */
 155 static Boolean matches_local(struct wpa_supplicant *wpa_s,
 156                              struct ieee802_11_elems *elems)
 157 {
 158         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
 159
 160         if (elems->mesh_config_len < 5)
 161                 return FALSE;
 162
 163         return (mconf->meshid_len == elems->mesh_id_len &&
 164                 os_memcmp(mconf->meshid, elems->mesh_id,
 165                           elems->mesh_id_len) == 0 &&
 166                 mconf->mesh_pp_id == elems->mesh_config[0] &&
 167                 mconf->mesh_pm_id == elems->mesh_config[1] &&
 168                 mconf->mesh_cc_id == elems->mesh_config[2] &&
 169                 mconf->mesh_sp_id == elems->mesh_config[3] &&
 170                 mconf->mesh_auth_id == elems->mesh_config[4]);
 171 }
 172
 173
 174 /* check if local link id is already used with another peer */
 175 static Boolean llid_in_use(struct wpa_supplicant *wpa_s, u16 llid)
 176 {
 177         struct sta_info *sta;
 178         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 179
 180         for (sta = hapd->sta_list; sta; sta = sta->next) {
 181                 if (sta->my_lid == llid)
 182                         return TRUE;
 183         }
 184
 185         return FALSE;
 186 }
 187
 188
 189 /* generate an llid for a link and set to initial state */
 190 static void mesh_mpm_init_link(struct wpa_supplicant *wpa_s,
 191                                struct sta_info *sta)
 192 {
 193         u16 llid;
 194
 195         do {
 196                 if (os_get_random((u8 *) &llid, sizeof(llid)) < 0)
 197                         continue;
 198         } while (!llid || llid_in_use(wpa_s, llid));
 199
 200         sta->my_lid = llid;
 201         sta->peer_lid = 0;
 202         sta->plink_state = PLINK_LISTEN;
 203 }
 204
 205
 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
 221         if (!sta)
 222                 return;
 223
 224         buf = wpabuf_alloc(2 +      /* capability info */
 225                            2 +      /* AID */
 226                            2 + 8 +  /* supported rates */
 227                            2 + (32 - 8) +
 228                            2 + 32 + /* mesh ID */
 229                            2 + 7 +  /* mesh config */
 230                            2 + 26 + /* HT capabilities */
 231                            2 + 22 + /* HT operation */
 232                            2 + 23 + /* peering management */
 233                            2 + 96 + /* AMPE */
 234                            2 + 16); /* MIC */
 235         if (!buf)
 236                 return;
 237
 238         cat = wpabuf_mhead_u8(buf);
 239         wpabuf_put_u8(buf, WLAN_ACTION_SELF_PROTECTED);
 240         wpabuf_put_u8(buf, type);
 241
 242         if (type != PLINK_CLOSE) {
 243                 /* capability info */
 244                 wpabuf_put_le16(buf, ampe ? IEEE80211_CAP_PRIVACY : 0);
 245
 246                 if (type == PLINK_CONFIRM)
 247                         wpabuf_put_le16(buf, sta->peer_lid);
 248
 249                 /* IE: supp + ext. supp rates */
 250                 pos = hostapd_eid_supp_rates(bss, supp_rates);
 251                 pos = hostapd_eid_ext_supp_rates(bss, pos);
 252                 wpabuf_put_data(buf, supp_rates, pos - supp_rates);
 253
 254                 /* IE: Mesh ID */
 255                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 256                 wpabuf_put_u8(buf, conf->meshid_len);
 257                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 258
 259                 /* IE: mesh conf */
 260                 wpabuf_put_u8(buf, WLAN_EID_MESH_CONFIG);
 261                 wpabuf_put_u8(buf, 7);
 262                 wpabuf_put_u8(buf, conf->mesh_pp_id);
 263                 wpabuf_put_u8(buf, conf->mesh_pm_id);
 264                 wpabuf_put_u8(buf, conf->mesh_cc_id);
 265                 wpabuf_put_u8(buf, conf->mesh_sp_id);
 266                 wpabuf_put_u8(buf, conf->mesh_auth_id);
 267                 /* TODO: formation info */
 268                 wpabuf_put_u8(buf, 0);
 269                 /* always forwarding & accepting plinks for now */
 270                 wpabuf_put_u8(buf, 0x1 | 0x8);
 271         } else {        /* Peer closing frame */
 272                 /* IE: Mesh ID */
 273                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 274                 wpabuf_put_u8(buf, conf->meshid_len);
 275                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 276         }
 277
 278         /* IE: Mesh Peering Management element */
 279         ie_len = 4;
 280         if (ampe)
 281                 ie_len += PMKID_LEN;
 282         switch (type) {
 283         case PLINK_OPEN:
 284                 break;
 285         case PLINK_CONFIRM:
 286                 ie_len += 2;
 287                 add_plid = 1;
 288                 break;
 289         case PLINK_CLOSE:
 290                 ie_len += 2;
 291                 add_plid = 1;
 292                 ie_len += 2; /* reason code */
 293                 break;
 294         }
 295
 296         wpabuf_put_u8(buf, WLAN_EID_PEER_MGMT);
 297         wpabuf_put_u8(buf, ie_len);
 298         /* peering protocol */
 299         if (ampe)
 300                 wpabuf_put_le16(buf, 1);
 301         else
 302                 wpabuf_put_le16(buf, 0);
 303         wpabuf_put_le16(buf, sta->my_lid);
 304         if (add_plid)
 305                 wpabuf_put_le16(buf, sta->peer_lid);
 306         if (type == PLINK_CLOSE)
 307                 wpabuf_put_le16(buf, close_reason);
 308         if (ampe)
 309                 mesh_rsn_get_pmkid(wpa_s->mesh_rsn, sta,
 310                                    wpabuf_put(buf, PMKID_LEN));
 311
 312         /* TODO HT IEs */
 313
 314         if (ampe && mesh_rsn_protect_frame(wpa_s->mesh_rsn, sta, cat, buf)) {
 315                 wpa_msg(wpa_s, MSG_INFO,
 316                         "Mesh MPM: failed to add AMPE and MIC IE");
 317                 goto fail;
 318         }
 319
 320         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0,
 321                                   sta->addr, wpa_s->own_addr, wpa_s->own_addr,
 322                                   wpabuf_head(buf), wpabuf_len(buf), 0);
 323         if (ret < 0)
 324                 wpa_msg(wpa_s, MSG_INFO,
 325                         "Mesh MPM: failed to send peering frame");
 326
 327 fail:
 328         wpabuf_free(buf);
 329 }
 330
 331
 332 /* configure peering state in ours and driver's station entry */
 333 static void
 334 wpa_mesh_set_plink_state(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 335                          enum mesh_plink_state state)
 336 {
 337         struct hostapd_sta_add_params params;
 338         int ret;
 339
 340         sta->plink_state = state;
 341
 342         os_memset(&params, 0, sizeof(params));
 343         params.addr = sta->addr;
 344         params.plink_state = state;
 345         params.set = 1;
 346
 347         wpa_msg(wpa_s, MSG_DEBUG, "MPM set " MACSTR " into %s",
 348                 MAC2STR(sta->addr), mplstate[state]);
 349         ret = wpa_drv_sta_add(wpa_s, &params);
 350         if (ret) {
 351                 wpa_msg(wpa_s, MSG_ERROR, "Driver failed to set " MACSTR
 352                         ": %d", MAC2STR(sta->addr), ret);
 353         }
 354 }
 355
 356
 357 static void mesh_mpm_fsm_restart(struct wpa_supplicant *wpa_s,
 358                                  struct sta_info *sta)
 359 {
 360         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 361
 362         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 363
 364         if (sta->mpm_close_reason == WLAN_REASON_MESH_CLOSE_RCVD) {
 365                 ap_free_sta(hapd, sta);
 366                 return;
 367         }
 368
 369         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_LISTEN);
 370         sta->my_lid = sta->peer_lid = sta->mpm_close_reason = 0;
 371         sta->mpm_retries = 0;
 372 }
 373
 374
 375 static void plink_timer(void *eloop_ctx, void *user_data)
 376 {
 377         struct wpa_supplicant *wpa_s = eloop_ctx;
 378         struct sta_info *sta = user_data;
 379         u16 reason = 0;
 380
 381         switch (sta->plink_state) {
 382         case PLINK_OPEN_RCVD:
 383         case PLINK_OPEN_SENT:
 384                 /* retry timer */
 385                 if (sta->mpm_retries < dot11MeshMaxRetries) {
 386                         eloop_register_timeout(dot11MeshRetryTimeout, 0,
 387                                                plink_timer, wpa_s, sta);
 388                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 389                         sta->mpm_retries++;
 390                         break;
 391                 }
 392                 reason = WLAN_REASON_MESH_MAX_RETRIES;
 393                 /* fall through on else */
 394
 395         case PLINK_CNF_RCVD:
 396                 /* confirm timer */
 397                 if (!reason)
 398                         reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
 399                 sta->plink_state = PLINK_HOLDING;
 400                 eloop_register_timeout(dot11MeshHoldingTimeout, 0,
 401                                        plink_timer, wpa_s, sta);
 402                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 403                 break;
 404         case PLINK_HOLDING:
 405                 /* holding timer */
 406                 mesh_mpm_fsm_restart(wpa_s, sta);
 407                 break;
 408         default:
 409                 break;
 410         }
 411 }
 412
 413
 414 /* initiate peering with station */
 415 static void
 416 mesh_mpm_plink_open(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 417                     enum mesh_plink_state next_state)
 418 {
 419         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 420         eloop_register_timeout(dot11MeshRetryTimeout, 0, plink_timer,
 421                                wpa_s, sta);
 422         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 423         wpa_mesh_set_plink_state(wpa_s, sta, next_state);
 424 }
 425
 426
 427 int mesh_mpm_plink_close(struct hostapd_data *hapd,
 428                          struct sta_info *sta, void *ctx)
 429 {
 430         struct wpa_supplicant *wpa_s = ctx;
 431         int reason = WLAN_REASON_MESH_PEERING_CANCELLED;
 432
 433         if (sta) {
 434                 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 435                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 436                 wpa_printf(MSG_DEBUG, "MPM closing plink sta=" MACSTR,
 437                            MAC2STR(sta->addr));
 438                 eloop_cancel_timeout(plink_timer, wpa_s, sta);
 439                 return 0;
 440         }
 441
 442         return 1;
 443 }
 444
 445
 446 void mesh_mpm_deinit(struct wpa_supplicant *wpa_s, struct hostapd_iface *ifmsh)
 447 {
 448         struct hostapd_data *hapd = ifmsh->bss[0];
 449
 450         /* notify peers we're leaving */
 451         ap_for_each_sta(hapd, mesh_mpm_plink_close, wpa_s);
 452
 453         hapd->num_plinks = 0;
 454         hostapd_free_stas(hapd);
 455 }
 456
 457
 458 /* for mesh_rsn to indicate this peer has completed authentication, and we're
 459  * ready to start AMPE */
 460 void mesh_mpm_auth_peer(struct wpa_supplicant *wpa_s, const u8 *addr)
 461 {
 462         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 463         struct hostapd_sta_add_params params;
 464         struct sta_info *sta;
 465         int ret;
 466
 467         sta = ap_get_sta(data, addr);
 468         if (!sta) {
 469                 wpa_msg(wpa_s, MSG_DEBUG, "no such mesh peer");
 470                 return;
 471         }
 472
 473         /* TODO: Should do nothing if this STA is already authenticated, but
 474          * the AP code already sets this flag. */
 475         sta->flags |= WLAN_STA_AUTH;
 476
 477         mesh_rsn_init_ampe_sta(wpa_s, sta);
 478
 479         os_memset(&params, 0, sizeof(params));
 480         params.addr = sta->addr;
 481         params.flags = WPA_STA_AUTHENTICATED | WPA_STA_AUTHORIZED;
 482         params.set = 1;
 483
 484         wpa_msg(wpa_s, MSG_DEBUG, "MPM authenticating " MACSTR,
 485                 MAC2STR(sta->addr));
 486         ret = wpa_drv_sta_add(wpa_s, &params);
 487         if (ret) {
 488                 wpa_msg(wpa_s, MSG_ERROR,
 489                         "Driver failed to set " MACSTR ": %d",
 490                         MAC2STR(sta->addr), ret);
 491         }
 492
 493         if (!sta->my_lid)
 494                 mesh_mpm_init_link(wpa_s, sta);
 495
 496         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 497 }
 498
 499
 500 void wpa_mesh_new_mesh_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 501                             struct ieee802_11_elems *elems)
 502 {
 503         struct hostapd_sta_add_params params;
 504         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 505         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 506         struct sta_info *sta;
 507         struct wpa_ssid *ssid = wpa_s->current_ssid;
 508         int ret = 0;
 509
 510         sta = ap_get_sta(data, addr);
 511         if (!sta) {
 512                 sta = ap_sta_add(data, addr);
 513                 if (!sta)
 514                         return;
 515         }
 516
 517         /* initialize sta */
 518         if (copy_supp_rates(wpa_s, sta, elems))
 519                 return;
 520
 521         mesh_mpm_init_link(wpa_s, sta);
 522
 523         /* insert into driver */
 524         os_memset(&params, 0, sizeof(params));
 525         params.supp_rates = sta->supported_rates;
 526         params.supp_rates_len = sta->supported_rates_len;
 527         params.addr = addr;
 528         params.plink_state = sta->plink_state;
 529         params.aid = sta->peer_lid;
 530         params.listen_interval = 100;
 531         /* TODO: HT capabilities */
 532         params.flags |= WPA_STA_WMM;
 533         params.flags_mask |= WPA_STA_AUTHENTICATED;
 534         if (conf->security == MESH_CONF_SEC_NONE) {
 535                 params.flags |= WPA_STA_AUTHORIZED;
 536                 params.flags |= WPA_STA_AUTHENTICATED;
 537         } else {
 538                 sta->flags |= WLAN_STA_MFP;
 539                 params.flags |= WPA_STA_MFP;
 540         }
 541
 542         ret = wpa_drv_sta_add(wpa_s, &params);
 543         if (ret) {
 544                 wpa_msg(wpa_s, MSG_ERROR,
 545                         "Driver failed to insert " MACSTR ": %d",
 546                         MAC2STR(addr), ret);
 547                 return;
 548         }
 549
 550         if (ssid && ssid->no_auto_peer) {
 551                 wpa_msg(wpa_s, MSG_INFO, "will not initiate new peer link with "
 552                         MACSTR " because of no_auto_peer", MAC2STR(addr));
 553                 return;
 554         }
 555
 556         if (conf->security == MESH_CONF_SEC_NONE)
 557                 mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 558         else
 559                 mesh_rsn_auth_sae_sta(wpa_s, sta);
 560 }
 561
 562
 563 void mesh_mpm_mgmt_rx(struct wpa_supplicant *wpa_s, struct rx_mgmt *rx_mgmt)
 564 {
 565         struct hostapd_frame_info fi;
 566
 567         os_memset(&fi, 0, sizeof(fi));
 568         fi.datarate = rx_mgmt->datarate;
 569         fi.ssi_signal = rx_mgmt->ssi_signal;
 570         ieee802_11_mgmt(wpa_s->ifmsh->bss[0], rx_mgmt->frame,
 571                         rx_mgmt->frame_len, &fi);
 572 }
 573
 574
 575 static void mesh_mpm_plink_estab(struct wpa_supplicant *wpa_s,
 576                                  struct sta_info *sta)
 577 {
 578         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 579         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 580         u8 seq[6] = {};
 581
 582         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR " established",
 583                 MAC2STR(sta->addr));
 584
 585         if (conf->security & MESH_CONF_SEC_AMPE) {
 586                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 0, 0,
 587                                 seq, sizeof(seq), sta->mtk, sizeof(sta->mtk));
 588                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 1, 0,
 589                                 seq, sizeof(seq),
 590                                 sta->mgtk, sizeof(sta->mgtk));
 591                 wpa_drv_set_key(wpa_s, WPA_ALG_IGTK, sta->addr, 4, 0,
 592                                 seq, sizeof(seq),
 593                                 sta->mgtk, sizeof(sta->mgtk));
 594
 595                 wpa_hexdump_key(MSG_DEBUG, "mtk:", sta->mtk, sizeof(sta->mtk));
 596                 wpa_hexdump_key(MSG_DEBUG, "mgtk:",
 597                                 sta->mgtk, sizeof(sta->mgtk));
 598         }
 599
 600         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_ESTAB);
 601         hapd->num_plinks++;
 602
 603         sta->flags |= WLAN_STA_ASSOC;
 604
 605         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 606
 607         /* Send ctrl event */
 608         wpa_msg_ctrl(wpa_s, MSG_INFO, MESH_PEER_CONNECTED MACSTR,
 609                      MAC2STR(sta->addr));
 610 }
 611
 612
 613 static void mesh_mpm_fsm(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 614                          enum plink_event event)
 615 {
 616         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 617         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 618         u16 reason = 0;
 619
 620         wpa_msg(wpa_s, MSG_DEBUG, "MPM " MACSTR " state %s event %s",
 621                 MAC2STR(sta->addr), mplstate[sta->plink_state],
 622                 mplevent[event]);
 623
 624         switch (sta->plink_state) {
 625         case PLINK_LISTEN:
 626                 switch (event) {
 627                 case CLS_ACPT:
 628                         mesh_mpm_fsm_restart(wpa_s, sta);
 629                         break;
 630                 case OPN_ACPT:
 631                         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_RCVD);
 632                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CONFIRM,
 633                                                    0);
 634                         break;
 635                 default:
 636                         break;
 637                 }
 638                 break;
 639         case PLINK_OPEN_SENT:
 640                 switch (event) {
 641                 case OPN_RJCT:
 642                 case CNF_RJCT:
 643                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 644                         /* fall-through */
 645                 case CLS_ACPT:
 646                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 647                         if (!reason)
 648                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 649                         eloop_register_timeout(dot11MeshHoldingTimeout, 0,
 650                                                plink_timer, wpa_s, sta);
 651                         mesh_mpm_send_plink_action(wpa_s, sta,
 652                                                    PLINK_CLOSE, reason);
 653                         break;
 654                 case OPN_ACPT:
 655                         /* retry timer is left untouched */
 656                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_OPEN_RCVD);
 657                         mesh_mpm_send_plink_action(wpa_s, sta,
 658                                                    PLINK_CONFIRM, 0);
 659                         break;
 660                 case CNF_ACPT:
 661                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_CNF_RCVD);
 662                         eloop_register_timeout(dot11MeshConfirmTimeout, 0,
 663                                                plink_timer, wpa_s, sta);
 664                         break;
 665                 default:
 666                         break;
 667                 }
 668                 break;
 669         case PLINK_OPEN_RCVD:
 670                 switch (event) {
 671                 case OPN_RJCT:
 672                 case CNF_RJCT:
 673                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 674                         /* fall-through */
 675                 case CLS_ACPT:
 676                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 677                         if (!reason)
 678                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 679                         eloop_register_timeout(dot11MeshHoldingTimeout, 0,
 680                                                plink_timer, wpa_s, sta);
 681                         sta->mpm_close_reason = reason;
 682                         mesh_mpm_send_plink_action(wpa_s, sta,
 683                                                    PLINK_CLOSE, reason);
 684                         break;
 685                 case OPN_ACPT:
 686                         mesh_mpm_send_plink_action(wpa_s, sta,
 687                                                    PLINK_CONFIRM, 0);
 688                         break;
 689                 case CNF_ACPT:
 690                         if (conf->security & MESH_CONF_SEC_AMPE)
 691                                 mesh_rsn_derive_mtk(wpa_s, sta);
 692                         mesh_mpm_plink_estab(wpa_s, sta);
 693                         break;
 694                 default:
 695                         break;
 696                 }
 697                 break;
 698         case PLINK_CNF_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(dot11MeshHoldingTimeout, 0,
 709                                                plink_timer, wpa_s, sta);
 710                         sta->mpm_close_reason = reason;
 711                         mesh_mpm_send_plink_action(wpa_s, sta,
 712                                                    PLINK_CLOSE, reason);
 713                         break;
 714                 case OPN_ACPT:
 715                         mesh_mpm_plink_estab(wpa_s, sta);
 716                         mesh_mpm_send_plink_action(wpa_s, sta,
 717                                                    PLINK_CONFIRM, 0);
 718                         break;
 719                 default:
 720                         break;
 721                 }
 722                 break;
 723         case PLINK_ESTAB:
 724                 switch (event) {
 725                 case CLS_ACPT:
 726                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 727                         reason = WLAN_REASON_MESH_CLOSE_RCVD;
 728
 729                         eloop_register_timeout(dot11MeshHoldingTimeout, 0,
 730                                                plink_timer, wpa_s, sta);
 731                         sta->mpm_close_reason = reason;
 732
 733                         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR
 734                                 " closed with reason %d",
 735                                 MAC2STR(sta->addr), reason);
 736
 737                         wpa_msg_ctrl(wpa_s, MSG_INFO,
 738                                      MESH_PEER_DISCONNECTED MACSTR,
 739                                      MAC2STR(sta->addr));
 740
 741                         hapd->num_plinks--;
 742
 743                         mesh_mpm_send_plink_action(wpa_s, sta,
 744                                                    PLINK_CLOSE, reason);
 745                         break;
 746                 case OPN_ACPT:
 747                         mesh_mpm_send_plink_action(wpa_s, sta,
 748                                                    PLINK_CONFIRM, 0);
 749                         break;
 750                 default:
 751                         break;
 752                 }
 753                 break;
 754         case PLINK_HOLDING:
 755                 switch (event) {
 756                 case CLS_ACPT:
 757                         mesh_mpm_fsm_restart(wpa_s, sta);
 758                         break;
 759                 case OPN_ACPT:
 760                 case CNF_ACPT:
 761                 case OPN_RJCT:
 762                 case CNF_RJCT:
 763                         reason = sta->mpm_close_reason;
 764                         mesh_mpm_send_plink_action(wpa_s, sta,
 765                                                    PLINK_CLOSE, reason);
 766                         break;
 767                 default:
 768                         break;
 769                 }
 770                 break;
 771         default:
 772                 wpa_msg(wpa_s, MSG_DEBUG,
 773                         "Unsupported MPM event %s for state %s",
 774                         mplevent[event], mplstate[sta->plink_state]);
 775                 break;
 776         }
 777 }
 778
 779
 780 void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
 781                         const struct ieee80211_mgmt *mgmt, size_t len)
 782 {
 783         u8 action_field;
 784         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 785         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
 786         struct sta_info *sta;
 787         u16 plid = 0, llid = 0;
 788         enum plink_event event;
 789         struct ieee802_11_elems elems;
 790         struct mesh_peer_mgmt_ie peer_mgmt_ie;
 791         const u8 *ies;
 792         size_t ie_len;
 793         int ret;
 794
 795         if (mgmt->u.action.category != WLAN_ACTION_SELF_PROTECTED)
 796                 return;
 797
 798         action_field = mgmt->u.action.u.slf_prot_action.action;
 799
 800         ies = mgmt->u.action.u.slf_prot_action.variable;
 801         ie_len = (const u8 *) mgmt + len -
 802                 mgmt->u.action.u.slf_prot_action.variable;
 803
 804         /* at least expect mesh id and peering mgmt */
 805         if (ie_len < 2 + 2)
 806                 return;
 807
 808         if (action_field == PLINK_OPEN || action_field == PLINK_CONFIRM) {
 809                 ies += 2;       /* capability */
 810                 ie_len -= 2;
 811         }
 812         if (action_field == PLINK_CONFIRM) {
 813                 ies += 2;       /* aid */
 814                 ie_len -= 2;
 815         }
 816
 817         /* check for mesh peering, mesh id and mesh config IEs */
 818         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed)
 819                 return;
 820         if (!elems.peer_mgmt)
 821                 return;
 822         if ((action_field != PLINK_CLOSE) &&
 823             (!elems.mesh_id || !elems.mesh_config))
 824                 return;
 825
 826         if (action_field != PLINK_CLOSE && !matches_local(wpa_s, &elems))
 827                 return;
 828
 829         ret = mesh_mpm_parse_peer_mgmt(wpa_s, action_field,
 830                                        elems.peer_mgmt,
 831                                        elems.peer_mgmt_len,
 832                                        &peer_mgmt_ie);
 833         if (ret)
 834                 return;
 835
 836         /* the sender's llid is our plid and vice-versa */
 837         plid = WPA_GET_LE16(peer_mgmt_ie.llid);
 838         if (peer_mgmt_ie.plid)
 839                 llid = WPA_GET_LE16(peer_mgmt_ie.plid);
 840
 841         sta = ap_get_sta(hapd, mgmt->sa);
 842         if (!sta)
 843                 return;
 844
 845 #ifdef CONFIG_SAE
 846         /* peer is in sae_accepted? */
 847         if (sta->sae && sta->sae->state != SAE_ACCEPTED)
 848                 return;
 849 #endif /* CONFIG_SAE */
 850
 851         if (!sta->my_lid)
 852                 mesh_mpm_init_link(wpa_s, sta);
 853
 854         if (mconf->security & MESH_CONF_SEC_AMPE)
 855                 if (mesh_rsn_process_ampe(wpa_s, sta, &elems,
 856                                           &mgmt->u.action.category,
 857                                           ies, ie_len))
 858                         return;
 859
 860         if (sta->plink_state == PLINK_BLOCKED)
 861                 return;
 862
 863         /* Now we will figure out the appropriate event... */
 864         switch (action_field) {
 865         case PLINK_OPEN:
 866                 if (!plink_free_count(hapd) ||
 867                     (sta->peer_lid && sta->peer_lid != plid)) {
 868                         event = OPN_IGNR;
 869                 } else {
 870                         sta->peer_lid = plid;
 871                         event = OPN_ACPT;
 872                 }
 873                 break;
 874         case PLINK_CONFIRM:
 875                 if (!plink_free_count(hapd) ||
 876                     sta->my_lid != llid ||
 877                     (sta->peer_lid && sta->peer_lid != plid)) {
 878                         event = CNF_IGNR;
 879                 } else {
 880                         if (!sta->peer_lid)
 881                                 sta->peer_lid = plid;
 882                         event = CNF_ACPT;
 883                 }
 884                 break;
 885         case PLINK_CLOSE:
 886                 if (sta->plink_state == PLINK_ESTAB)
 887                         /* Do not check for llid or plid. This does not
 888                          * follow the standard but since multiple plinks
 889                          * per cand are not supported, it is necessary in
 890                          * order to avoid a livelock when MP A sees an
 891                          * establish peer link to MP B but MP B does not
 892                          * see it. This can be caused by a timeout in
 893                          * B's peer link establishment or B being
 894                          * restarted.
 895                          */
 896                         event = CLS_ACPT;
 897                 else if (sta->peer_lid != plid)
 898                         event = CLS_IGNR;
 899                 else if (peer_mgmt_ie.plid && sta->my_lid != llid)
 900                         event = CLS_IGNR;
 901                 else
 902                         event = CLS_ACPT;
 903                 break;
 904         default:
 905                 wpa_msg(wpa_s, MSG_ERROR,
 906                         "Mesh plink: unknown frame subtype");
 907                 return;
 908         }
 909         mesh_mpm_fsm(wpa_s, sta, event);
 910 }
 911
 912
 913 /* called by ap_free_sta */
 914 void mesh_mpm_free_sta(struct sta_info *sta)
 915 {
 916         eloop_cancel_timeout(plink_timer, ELOOP_ALL_CTX, sta);
 917         eloop_cancel_timeout(mesh_auth_timer, ELOOP_ALL_CTX, sta);
 918 }