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 "ap/wpa_auth.h"
  18 #include "wpa_supplicant_i.h"
  19 #include "driver_i.h"
  20 #include "mesh_mpm.h"
  21 #include "mesh_rsn.h"
  22
  23 struct mesh_peer_mgmt_ie {
  24         const u8 *proto_id; /* Mesh Peering Protocol Identifier (2 octets) */
  25         const u8 *llid; /* Local Link ID (2 octets) */
  26         const u8 *plid; /* Peer Link ID (conditional, 2 octets) */
  27         const u8 *reason; /* Reason Code (conditional, 2 octets) */
  28         const u8 *chosen_pmk; /* Chosen PMK (optional, 16 octets) */
  29 };
  30
  31 static void plink_timer(void *eloop_ctx, void *user_data);
  32
  33
  34 enum plink_event {
  35         PLINK_UNDEFINED,
  36         OPN_ACPT,
  37         OPN_RJCT,
  38         OPN_IGNR,
  39         CNF_ACPT,
  40         CNF_RJCT,
  41         CNF_IGNR,
  42         CLS_ACPT,
  43         CLS_IGNR
  44 };
  45
  46 static const char * const mplstate[] = {
  47         [0] = "UNINITIALIZED",
  48         [PLINK_LISTEN] = "LISTEN",
  49         [PLINK_OPEN_SENT] = "OPEN_SENT",
  50         [PLINK_OPEN_RCVD] = "OPEN_RCVD",
  51         [PLINK_CNF_RCVD] = "CNF_RCVD",
  52         [PLINK_ESTAB] = "ESTAB",
  53         [PLINK_HOLDING] = "HOLDING",
  54         [PLINK_BLOCKED] = "BLOCKED"
  55 };
  56
  57 static const char * const mplevent[] = {
  58         [PLINK_UNDEFINED] = "UNDEFINED",
  59         [OPN_ACPT] = "OPN_ACPT",
  60         [OPN_RJCT] = "OPN_RJCT",
  61         [OPN_IGNR] = "OPN_IGNR",
  62         [CNF_ACPT] = "CNF_ACPT",
  63         [CNF_RJCT] = "CNF_RJCT",
  64         [CNF_IGNR] = "CNF_IGNR",
  65         [CLS_ACPT] = "CLS_ACPT",
  66         [CLS_IGNR] = "CLS_IGNR"
  67 };
  68
  69
  70 static int mesh_mpm_parse_peer_mgmt(struct wpa_supplicant *wpa_s,
  71                                     u8 action_field,
  72                                     const u8 *ie, size_t len,
  73                                     struct mesh_peer_mgmt_ie *mpm_ie)
  74 {
  75         os_memset(mpm_ie, 0, sizeof(*mpm_ie));
  76
  77         /* Remove optional Chosen PMK field at end */
  78         if (len >= SAE_PMKID_LEN) {
  79                 mpm_ie->chosen_pmk = ie + len - SAE_PMKID_LEN;
  80                 len -= SAE_PMKID_LEN;
  81         }
  82
  83         if ((action_field == PLINK_OPEN && len != 4) ||
  84             (action_field == PLINK_CONFIRM && len != 6) ||
  85             (action_field == PLINK_CLOSE && len != 6 && len != 8)) {
  86                 wpa_msg(wpa_s, MSG_DEBUG, "MPM: Invalid peer mgmt ie");
  87                 return -1;
  88         }
  89
  90         /* required fields */
  91         if (len < 4)
  92                 return -1;
  93         mpm_ie->proto_id = ie;
  94         mpm_ie->llid = ie + 2;
  95         ie += 4;
  96         len -= 4;
  97
  98         /* close reason is always present at end for close */
  99         if (action_field == PLINK_CLOSE) {
 100                 if (len < 2)
 101                         return -1;
 102                 mpm_ie->reason = ie + len - 2;
 103                 len -= 2;
 104         }
 105
 106         /* Peer Link ID, present for confirm, and possibly close */
 107         if (len >= 2)
 108                 mpm_ie->plid = ie;
 109
 110         return 0;
 111 }
 112
 113
 114 static int plink_free_count(struct hostapd_data *hapd)
 115 {
 116         if (hapd->max_plinks > hapd->num_plinks)
 117                 return hapd->max_plinks - hapd->num_plinks;
 118         return 0;
 119 }
 120
 121
 122 static u16 copy_supp_rates(struct wpa_supplicant *wpa_s,
 123                            struct sta_info *sta,
 124                            struct ieee802_11_elems *elems)
 125 {
 126         if (!elems->supp_rates) {
 127                 wpa_msg(wpa_s, MSG_ERROR, "no supported rates from " MACSTR,
 128                         MAC2STR(sta->addr));
 129                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 130         }
 131
 132         if (elems->supp_rates_len + elems->ext_supp_rates_len >
 133             sizeof(sta->supported_rates)) {
 134                 wpa_msg(wpa_s, MSG_ERROR,
 135                         "Invalid supported rates element length " MACSTR
 136                         " %d+%d", MAC2STR(sta->addr), elems->supp_rates_len,
 137                         elems->ext_supp_rates_len);
 138                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 139         }
 140
 141         sta->supported_rates_len = merge_byte_arrays(
 142                 sta->supported_rates, sizeof(sta->supported_rates),
 143                 elems->supp_rates, elems->supp_rates_len,
 144                 elems->ext_supp_rates, elems->ext_supp_rates_len);
 145
 146         return WLAN_STATUS_SUCCESS;
 147 }
 148
 149
 150 /* return true if elems from a neighbor match this MBSS */
 151 static Boolean matches_local(struct wpa_supplicant *wpa_s,
 152                              struct ieee802_11_elems *elems)
 153 {
 154         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
 155
 156         if (elems->mesh_config_len < 5)
 157                 return FALSE;
 158
 159         return (mconf->meshid_len == elems->mesh_id_len &&
 160                 os_memcmp(mconf->meshid, elems->mesh_id,
 161                           elems->mesh_id_len) == 0 &&
 162                 mconf->mesh_pp_id == elems->mesh_config[0] &&
 163                 mconf->mesh_pm_id == elems->mesh_config[1] &&
 164                 mconf->mesh_cc_id == elems->mesh_config[2] &&
 165                 mconf->mesh_sp_id == elems->mesh_config[3] &&
 166                 mconf->mesh_auth_id == elems->mesh_config[4]);
 167 }
 168
 169
 170 /* check if local link id is already used with another peer */
 171 static Boolean llid_in_use(struct wpa_supplicant *wpa_s, u16 llid)
 172 {
 173         struct sta_info *sta;
 174         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 175
 176         for (sta = hapd->sta_list; sta; sta = sta->next) {
 177                 if (sta->my_lid == llid)
 178                         return TRUE;
 179         }
 180
 181         return FALSE;
 182 }
 183
 184
 185 /* generate an llid for a link and set to initial state */
 186 static void mesh_mpm_init_link(struct wpa_supplicant *wpa_s,
 187                                struct sta_info *sta)
 188 {
 189         u16 llid;
 190
 191         do {
 192                 if (os_get_random((u8 *) &llid, sizeof(llid)) < 0)
 193                         continue;
 194         } while (!llid || llid_in_use(wpa_s, llid));
 195
 196         sta->my_lid = llid;
 197         sta->peer_lid = 0;
 198
 199         /*
 200          * We do not use wpa_mesh_set_plink_state() here because there is no
 201          * entry in kernel yet.
 202          */
 203         sta->plink_state = PLINK_LISTEN;
 204 }
 205
 206
 207 static void mesh_mpm_send_plink_action(struct wpa_supplicant *wpa_s,
 208                                        struct sta_info *sta,
 209                                        enum plink_action_field type,
 210                                        u16 close_reason)
 211 {
 212         struct wpabuf *buf;
 213         struct hostapd_iface *ifmsh = wpa_s->ifmsh;
 214         struct hostapd_data *bss = ifmsh->bss[0];
 215         struct mesh_conf *conf = ifmsh->mconf;
 216         u8 supp_rates[2 + 2 + 32];
 217         u8 *pos, *cat;
 218         u8 ie_len, add_plid = 0;
 219         int ret;
 220         int ampe = conf->security & MESH_CONF_SEC_AMPE;
 221         size_t buf_len;
 222
 223         if (!sta)
 224                 return;
 225
 226         buf_len = 2 +      /* capability info */
 227                   2 +      /* AID */
 228                   2 + 8 +  /* supported rates */
 229                   2 + (32 - 8) +
 230                   2 + 32 + /* mesh ID */
 231                   2 + 7 +  /* mesh config */
 232                   2 + 23 + /* peering management */
 233                   2 + 96 + /* AMPE */
 234                   2 + 16;  /* MIC */
 235 #ifdef CONFIG_IEEE80211N
 236         if (type != PLINK_CLOSE && wpa_s->mesh_ht_enabled) {
 237                 buf_len += 2 + 26 + /* HT capabilities */
 238                            2 + 22;  /* HT operation */
 239         }
 240 #endif /* CONFIG_IEEE80211N */
 241 #ifdef CONFIG_IEEE80211AC
 242         if (type != PLINK_CLOSE && wpa_s->mesh_vht_enabled) {
 243                 buf_len += 2 + 12 + /* VHT Capabilities */
 244                            2 + 5;  /* VHT Operation */
 245         }
 246 #endif /* CONFIG_IEEE80211AC */
 247         if (type != PLINK_CLOSE)
 248                 buf_len += conf->rsn_ie_len; /* RSN IE */
 249
 250         buf = wpabuf_alloc(buf_len);
 251         if (!buf)
 252                 return;
 253
 254         cat = wpabuf_mhead_u8(buf);
 255         wpabuf_put_u8(buf, WLAN_ACTION_SELF_PROTECTED);
 256         wpabuf_put_u8(buf, type);
 257
 258         if (type != PLINK_CLOSE) {
 259                 u8 info;
 260
 261                 /* capability info */
 262                 wpabuf_put_le16(buf, ampe ? IEEE80211_CAP_PRIVACY : 0);
 263
 264                 /* aid */
 265                 if (type == PLINK_CONFIRM)
 266                         wpabuf_put_le16(buf, sta->aid);
 267
 268                 /* IE: supp + ext. supp rates */
 269                 pos = hostapd_eid_supp_rates(bss, supp_rates);
 270                 pos = hostapd_eid_ext_supp_rates(bss, pos);
 271                 wpabuf_put_data(buf, supp_rates, pos - supp_rates);
 272
 273                 /* IE: RSN IE */
 274                 wpabuf_put_data(buf, conf->rsn_ie, conf->rsn_ie_len);
 275
 276                 /* IE: Mesh ID */
 277                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 278                 wpabuf_put_u8(buf, conf->meshid_len);
 279                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 280
 281                 /* IE: mesh conf */
 282                 wpabuf_put_u8(buf, WLAN_EID_MESH_CONFIG);
 283                 wpabuf_put_u8(buf, 7);
 284                 wpabuf_put_u8(buf, conf->mesh_pp_id);
 285                 wpabuf_put_u8(buf, conf->mesh_pm_id);
 286                 wpabuf_put_u8(buf, conf->mesh_cc_id);
 287                 wpabuf_put_u8(buf, conf->mesh_sp_id);
 288                 wpabuf_put_u8(buf, conf->mesh_auth_id);
 289                 info = (bss->num_plinks > 63 ? 63 : bss->num_plinks) << 1;
 290                 /* TODO: Add Connected to Mesh Gate/AS subfields */
 291                 wpabuf_put_u8(buf, info);
 292                 /* always forwarding & accepting plinks for now */
 293                 wpabuf_put_u8(buf, 0x1 | 0x8);
 294         } else {        /* Peer closing frame */
 295                 /* IE: Mesh ID */
 296                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 297                 wpabuf_put_u8(buf, conf->meshid_len);
 298                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 299         }
 300
 301         /* IE: Mesh Peering Management element */
 302         ie_len = 4;
 303         if (ampe)
 304                 ie_len += PMKID_LEN;
 305         switch (type) {
 306         case PLINK_OPEN:
 307                 break;
 308         case PLINK_CONFIRM:
 309                 ie_len += 2;
 310                 add_plid = 1;
 311                 break;
 312         case PLINK_CLOSE:
 313                 ie_len += 2;
 314                 add_plid = 1;
 315                 ie_len += 2; /* reason code */
 316                 break;
 317         }
 318
 319         wpabuf_put_u8(buf, WLAN_EID_PEER_MGMT);
 320         wpabuf_put_u8(buf, ie_len);
 321         /* peering protocol */
 322         if (ampe)
 323                 wpabuf_put_le16(buf, 1);
 324         else
 325                 wpabuf_put_le16(buf, 0);
 326         wpabuf_put_le16(buf, sta->my_lid);
 327         if (add_plid)
 328                 wpabuf_put_le16(buf, sta->peer_lid);
 329         if (type == PLINK_CLOSE)
 330                 wpabuf_put_le16(buf, close_reason);
 331         if (ampe) {
 332                 if (sta->sae == NULL) {
 333                         wpa_msg(wpa_s, MSG_INFO, "Mesh MPM: no SAE session");
 334                         goto fail;
 335                 }
 336                 mesh_rsn_get_pmkid(wpa_s->mesh_rsn, sta,
 337                                    wpabuf_put(buf, PMKID_LEN));
 338         }
 339
 340 #ifdef CONFIG_IEEE80211N
 341         if (type != PLINK_CLOSE && wpa_s->mesh_ht_enabled) {
 342                 u8 ht_capa_oper[2 + 26 + 2 + 22];
 343
 344                 pos = hostapd_eid_ht_capabilities(bss, ht_capa_oper);
 345                 pos = hostapd_eid_ht_operation(bss, pos);
 346                 wpabuf_put_data(buf, ht_capa_oper, pos - ht_capa_oper);
 347         }
 348 #endif /* CONFIG_IEEE80211N */
 349 #ifdef CONFIG_IEEE80211AC
 350         if (type != PLINK_CLOSE && wpa_s->mesh_vht_enabled) {
 351                 u8 vht_capa_oper[2 + 12 + 2 + 5];
 352
 353                 pos = hostapd_eid_vht_capabilities(bss, vht_capa_oper);
 354                 pos = hostapd_eid_vht_operation(bss, pos);
 355                 wpabuf_put_data(buf, vht_capa_oper, pos - vht_capa_oper);
 356         }
 357 #endif /* CONFIG_IEEE80211AC */
 358
 359         if (ampe && mesh_rsn_protect_frame(wpa_s->mesh_rsn, sta, cat, buf)) {
 360                 wpa_msg(wpa_s, MSG_INFO,
 361                         "Mesh MPM: failed to add AMPE and MIC IE");
 362                 goto fail;
 363         }
 364
 365         wpa_msg(wpa_s, MSG_DEBUG, "Mesh MPM: Sending peering frame type %d to "
 366                 MACSTR " (my_lid=0x%x peer_lid=0x%x)",
 367                 type, MAC2STR(sta->addr), sta->my_lid, sta->peer_lid);
 368         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0,
 369                                   sta->addr, wpa_s->own_addr, wpa_s->own_addr,
 370                                   wpabuf_head(buf), wpabuf_len(buf), 0);
 371         if (ret < 0)
 372                 wpa_msg(wpa_s, MSG_INFO,
 373                         "Mesh MPM: failed to send peering frame");
 374
 375 fail:
 376         wpabuf_free(buf);
 377 }
 378
 379
 380 /* configure peering state in ours and driver's station entry */
 381 void wpa_mesh_set_plink_state(struct wpa_supplicant *wpa_s,
 382                               struct sta_info *sta,
 383                               enum mesh_plink_state state)
 384 {
 385         struct hostapd_sta_add_params params;
 386         int ret;
 387
 388         wpa_msg(wpa_s, MSG_DEBUG, "MPM set " MACSTR " from %s into %s",
 389                 MAC2STR(sta->addr), mplstate[sta->plink_state],
 390                 mplstate[state]);
 391         sta->plink_state = state;
 392
 393         os_memset(&params, 0, sizeof(params));
 394         params.addr = sta->addr;
 395         params.plink_state = state;
 396         params.set = 1;
 397
 398         ret = wpa_drv_sta_add(wpa_s, &params);
 399         if (ret) {
 400                 wpa_msg(wpa_s, MSG_ERROR, "Driver failed to set " MACSTR
 401                         ": %d", MAC2STR(sta->addr), ret);
 402         }
 403 }
 404
 405
 406 static void mesh_mpm_fsm_restart(struct wpa_supplicant *wpa_s,
 407                                  struct sta_info *sta)
 408 {
 409         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 410
 411         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 412
 413         ap_free_sta(hapd, sta);
 414 }
 415
 416
 417 static void plink_timer(void *eloop_ctx, void *user_data)
 418 {
 419         struct wpa_supplicant *wpa_s = eloop_ctx;
 420         struct sta_info *sta = user_data;
 421         u16 reason = 0;
 422         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 423         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 424
 425         switch (sta->plink_state) {
 426         case PLINK_OPEN_RCVD:
 427         case PLINK_OPEN_SENT:
 428                 /* retry timer */
 429                 if (sta->mpm_retries < conf->dot11MeshMaxRetries) {
 430                         eloop_register_timeout(
 431                                 conf->dot11MeshRetryTimeout / 1000,
 432                                 (conf->dot11MeshRetryTimeout % 1000) * 1000,
 433                                 plink_timer, wpa_s, sta);
 434                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 435                         sta->mpm_retries++;
 436                         break;
 437                 }
 438                 reason = WLAN_REASON_MESH_MAX_RETRIES;
 439                 /* fall through on else */
 440
 441         case PLINK_CNF_RCVD:
 442                 /* confirm timer */
 443                 if (!reason)
 444                         reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
 445                 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 446                 eloop_register_timeout(conf->dot11MeshHoldingTimeout / 1000,
 447                         (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 448                         plink_timer, wpa_s, sta);
 449                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 450                 break;
 451         case PLINK_HOLDING:
 452                 /* holding timer */
 453
 454                 if (sta->mesh_sae_pmksa_caching) {
 455                         wpa_printf(MSG_DEBUG, "MPM: Peer " MACSTR
 456                                    " looks like it does not support mesh SAE PMKSA caching, so remove the cached entry for it",
 457                                    MAC2STR(sta->addr));
 458                         wpa_auth_pmksa_remove(hapd->wpa_auth, sta->addr);
 459                 }
 460                 mesh_mpm_fsm_restart(wpa_s, sta);
 461                 break;
 462         default:
 463                 break;
 464         }
 465 }
 466
 467
 468 /* initiate peering with station */
 469 static void
 470 mesh_mpm_plink_open(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 471                     enum mesh_plink_state next_state)
 472 {
 473         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 474
 475         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 476         eloop_register_timeout(conf->dot11MeshRetryTimeout / 1000,
 477                                (conf->dot11MeshRetryTimeout % 1000) * 1000,
 478                                plink_timer, wpa_s, sta);
 479         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 480         wpa_mesh_set_plink_state(wpa_s, sta, next_state);
 481 }
 482
 483
 484 static int mesh_mpm_plink_close(struct hostapd_data *hapd, struct sta_info *sta,
 485                                 void *ctx)
 486 {
 487         struct wpa_supplicant *wpa_s = ctx;
 488         int reason = WLAN_REASON_MESH_PEERING_CANCELLED;
 489
 490         if (sta) {
 491                 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 492                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 493                 wpa_printf(MSG_DEBUG, "MPM closing plink sta=" MACSTR,
 494                            MAC2STR(sta->addr));
 495                 eloop_cancel_timeout(plink_timer, wpa_s, sta);
 496                 return 0;
 497         }
 498
 499         return 1;
 500 }
 501
 502
 503 int mesh_mpm_close_peer(struct wpa_supplicant *wpa_s, const u8 *addr)
 504 {
 505         struct hostapd_data *hapd;
 506         struct sta_info *sta;
 507
 508         if (!wpa_s->ifmsh) {
 509                 wpa_msg(wpa_s, MSG_INFO, "Mesh is not prepared yet");
 510                 return -1;
 511         }
 512
 513         hapd = wpa_s->ifmsh->bss[0];
 514         sta = ap_get_sta(hapd, addr);
 515         if (!sta) {
 516                 wpa_msg(wpa_s, MSG_INFO, "No such mesh peer");
 517                 return -1;
 518         }
 519
 520         return mesh_mpm_plink_close(hapd, sta, wpa_s) == 0 ? 0 : -1;
 521 }
 522
 523
 524 static void peer_add_timer(void *eloop_ctx, void *user_data)
 525 {
 526         struct wpa_supplicant *wpa_s = eloop_ctx;
 527         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 528
 529         os_memset(hapd->mesh_required_peer, 0, ETH_ALEN);
 530 }
 531
 532
 533 int mesh_mpm_connect_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 534                           int duration)
 535 {
 536         struct wpa_ssid *ssid = wpa_s->current_ssid;
 537         struct hostapd_data *hapd;
 538         struct sta_info *sta;
 539         struct mesh_conf *conf;
 540
 541         if (!wpa_s->ifmsh) {
 542                 wpa_msg(wpa_s, MSG_INFO, "Mesh is not prepared yet");
 543                 return -1;
 544         }
 545
 546         if (!ssid || !ssid->no_auto_peer) {
 547                 wpa_msg(wpa_s, MSG_INFO,
 548                         "This command is available only with no_auto_peer mesh network");
 549                 return -1;
 550         }
 551
 552         hapd = wpa_s->ifmsh->bss[0];
 553         conf = wpa_s->ifmsh->mconf;
 554
 555         sta = ap_get_sta(hapd, addr);
 556         if (!sta) {
 557                 wpa_msg(wpa_s, MSG_INFO, "No such mesh peer");
 558                 return -1;
 559         }
 560
 561         if ((PLINK_OPEN_SENT <= sta->plink_state &&
 562             sta->plink_state <= PLINK_ESTAB) ||
 563             (sta->sae && sta->sae->state > SAE_NOTHING)) {
 564                 wpa_msg(wpa_s, MSG_INFO,
 565                         "Specified peer is connecting/connected");
 566                 return -1;
 567         }
 568
 569         if (conf->security == MESH_CONF_SEC_NONE) {
 570                 mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 571         } else {
 572                 mesh_rsn_auth_sae_sta(wpa_s, sta);
 573                 os_memcpy(hapd->mesh_required_peer, addr, ETH_ALEN);
 574                 eloop_register_timeout(duration == -1 ? 10 : duration, 0,
 575                                        peer_add_timer, wpa_s, NULL);
 576         }
 577
 578         return 0;
 579 }
 580
 581
 582 void mesh_mpm_deinit(struct wpa_supplicant *wpa_s, struct hostapd_iface *ifmsh)
 583 {
 584         struct hostapd_data *hapd = ifmsh->bss[0];
 585
 586         /* notify peers we're leaving */
 587         ap_for_each_sta(hapd, mesh_mpm_plink_close, wpa_s);
 588
 589         hapd->num_plinks = 0;
 590         hostapd_free_stas(hapd);
 591         eloop_cancel_timeout(peer_add_timer, wpa_s, NULL);
 592 }
 593
 594
 595 /* for mesh_rsn to indicate this peer has completed authentication, and we're
 596  * ready to start AMPE */
 597 void mesh_mpm_auth_peer(struct wpa_supplicant *wpa_s, const u8 *addr)
 598 {
 599         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 600         struct hostapd_sta_add_params params;
 601         struct sta_info *sta;
 602         int ret;
 603
 604         sta = ap_get_sta(data, addr);
 605         if (!sta) {
 606                 wpa_msg(wpa_s, MSG_DEBUG, "no such mesh peer");
 607                 return;
 608         }
 609
 610         /* TODO: Should do nothing if this STA is already authenticated, but
 611          * the AP code already sets this flag. */
 612         sta->flags |= WLAN_STA_AUTH;
 613
 614         mesh_rsn_init_ampe_sta(wpa_s, sta);
 615
 616         os_memset(&params, 0, sizeof(params));
 617         params.addr = sta->addr;
 618         params.flags = WPA_STA_AUTHENTICATED | WPA_STA_AUTHORIZED;
 619         params.set = 1;
 620
 621         wpa_msg(wpa_s, MSG_DEBUG, "MPM authenticating " MACSTR,
 622                 MAC2STR(sta->addr));
 623         ret = wpa_drv_sta_add(wpa_s, &params);
 624         if (ret) {
 625                 wpa_msg(wpa_s, MSG_ERROR,
 626                         "Driver failed to set " MACSTR ": %d",
 627                         MAC2STR(sta->addr), ret);
 628         }
 629
 630         if (!sta->my_lid)
 631                 mesh_mpm_init_link(wpa_s, sta);
 632
 633         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 634 }
 635
 636 /*
 637  * Initialize a sta_info structure for a peer and upload it into the driver
 638  * in preparation for beginning authentication or peering. This is done when a
 639  * Beacon (secure or open mesh) or a peering open frame (for open mesh) is
 640  * received from the peer for the first time.
 641  */
 642 static struct sta_info * mesh_mpm_add_peer(struct wpa_supplicant *wpa_s,
 643                                            const u8 *addr,
 644                                            struct ieee802_11_elems *elems)
 645 {
 646         struct hostapd_sta_add_params params;
 647         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 648         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 649         struct sta_info *sta;
 650         int ret;
 651
 652         sta = ap_get_sta(data, addr);
 653         if (!sta) {
 654                 sta = ap_sta_add(data, addr);
 655                 if (!sta)
 656                         return NULL;
 657         }
 658
 659         /* Set WMM by default since Mesh STAs are QoS STAs */
 660         sta->flags |= WLAN_STA_WMM;
 661
 662         /* initialize sta */
 663         if (copy_supp_rates(wpa_s, sta, elems)) {
 664                 ap_free_sta(data, sta);
 665                 return NULL;
 666         }
 667
 668         if (!sta->my_lid)
 669                 mesh_mpm_init_link(wpa_s, sta);
 670
 671 #ifdef CONFIG_IEEE80211N
 672         copy_sta_ht_capab(data, sta, elems->ht_capabilities);
 673         update_ht_state(data, sta);
 674 #endif /* CONFIG_IEEE80211N */
 675
 676 #ifdef CONFIG_IEEE80211AC
 677         copy_sta_vht_capab(data, sta, elems->vht_capabilities);
 678         set_sta_vht_opmode(data, sta, elems->vht_opmode_notif);
 679 #endif /* CONFIG_IEEE80211AC */
 680
 681         if (hostapd_get_aid(data, sta) < 0) {
 682                 wpa_msg(wpa_s, MSG_ERROR, "No AIDs available");
 683                 ap_free_sta(data, sta);
 684                 return NULL;
 685         }
 686
 687         /* insert into driver */
 688         os_memset(&params, 0, sizeof(params));
 689         params.supp_rates = sta->supported_rates;
 690         params.supp_rates_len = sta->supported_rates_len;
 691         params.addr = addr;
 692         params.plink_state = sta->plink_state;
 693         params.aid = sta->aid;
 694         params.listen_interval = 100;
 695         params.ht_capabilities = sta->ht_capabilities;
 696         params.vht_capabilities = sta->vht_capabilities;
 697         params.flags |= WPA_STA_WMM;
 698         params.flags_mask |= WPA_STA_AUTHENTICATED;
 699         if (conf->security == MESH_CONF_SEC_NONE) {
 700                 params.flags |= WPA_STA_AUTHORIZED;
 701                 params.flags |= WPA_STA_AUTHENTICATED;
 702         } else {
 703                 sta->flags |= WLAN_STA_MFP;
 704                 params.flags |= WPA_STA_MFP;
 705         }
 706
 707         ret = wpa_drv_sta_add(wpa_s, &params);
 708         if (ret) {
 709                 wpa_msg(wpa_s, MSG_ERROR,
 710                         "Driver failed to insert " MACSTR ": %d",
 711                         MAC2STR(addr), ret);
 712                 ap_free_sta(data, sta);
 713                 return NULL;
 714         }
 715
 716         return sta;
 717 }
 718
 719
 720 void wpa_mesh_new_mesh_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 721                             struct ieee802_11_elems *elems)
 722 {
 723         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 724         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 725         struct sta_info *sta;
 726         struct wpa_ssid *ssid = wpa_s->current_ssid;
 727
 728         sta = mesh_mpm_add_peer(wpa_s, addr, elems);
 729         if (!sta)
 730                 return;
 731
 732         if (ssid && ssid->no_auto_peer &&
 733             (is_zero_ether_addr(data->mesh_required_peer) ||
 734              os_memcmp(data->mesh_required_peer, addr, ETH_ALEN) != 0)) {
 735                 wpa_msg(wpa_s, MSG_INFO, "will not initiate new peer link with "
 736                         MACSTR " because of no_auto_peer", MAC2STR(addr));
 737                 if (data->mesh_pending_auth) {
 738                         struct os_reltime age;
 739                         const struct ieee80211_mgmt *mgmt;
 740                         struct hostapd_frame_info fi;
 741
 742                         mgmt = wpabuf_head(data->mesh_pending_auth);
 743                         os_reltime_age(&data->mesh_pending_auth_time, &age);
 744                         if (age.sec < 2 &&
 745                             os_memcmp(mgmt->sa, addr, ETH_ALEN) == 0) {
 746                                 wpa_printf(MSG_DEBUG,
 747                                            "mesh: Process pending Authentication frame from %u.%06u seconds ago",
 748                                            (unsigned int) age.sec,
 749                                            (unsigned int) age.usec);
 750                                 os_memset(&fi, 0, sizeof(fi));
 751                                 ieee802_11_mgmt(
 752                                         data,
 753                                         wpabuf_head(data->mesh_pending_auth),
 754                                         wpabuf_len(data->mesh_pending_auth),
 755                                         &fi);
 756                         }
 757                         wpabuf_free(data->mesh_pending_auth);
 758                         data->mesh_pending_auth = NULL;
 759                 }
 760                 return;
 761         }
 762
 763         if (conf->security == MESH_CONF_SEC_NONE) {
 764                 if (sta->plink_state < PLINK_OPEN_SENT ||
 765                     sta->plink_state > PLINK_ESTAB)
 766                         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 767         } else {
 768                 mesh_rsn_auth_sae_sta(wpa_s, sta);
 769         }
 770 }
 771
 772
 773 void mesh_mpm_mgmt_rx(struct wpa_supplicant *wpa_s, struct rx_mgmt *rx_mgmt)
 774 {
 775         struct hostapd_frame_info fi;
 776
 777         os_memset(&fi, 0, sizeof(fi));
 778         fi.datarate = rx_mgmt->datarate;
 779         fi.ssi_signal = rx_mgmt->ssi_signal;
 780         ieee802_11_mgmt(wpa_s->ifmsh->bss[0], rx_mgmt->frame,
 781                         rx_mgmt->frame_len, &fi);
 782 }
 783
 784
 785 static void mesh_mpm_plink_estab(struct wpa_supplicant *wpa_s,
 786                                  struct sta_info *sta)
 787 {
 788         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 789         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 790         u8 seq[6] = {};
 791
 792         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR " established",
 793                 MAC2STR(sta->addr));
 794
 795         if (conf->security & MESH_CONF_SEC_AMPE) {
 796                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 0, 0,
 797                                 seq, sizeof(seq), sta->mtk, sizeof(sta->mtk));
 798                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 1, 0,
 799                                 seq, sizeof(seq),
 800                                 sta->mgtk, sizeof(sta->mgtk));
 801                 wpa_drv_set_key(wpa_s, WPA_ALG_IGTK, sta->addr, 4, 0,
 802                                 seq, sizeof(seq),
 803                                 sta->mgtk, sizeof(sta->mgtk));
 804
 805                 wpa_hexdump_key(MSG_DEBUG, "mtk:", sta->mtk, sizeof(sta->mtk));
 806                 wpa_hexdump_key(MSG_DEBUG, "mgtk:",
 807                                 sta->mgtk, sizeof(sta->mgtk));
 808         }
 809
 810         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_ESTAB);
 811         hapd->num_plinks++;
 812
 813         sta->flags |= WLAN_STA_ASSOC;
 814         sta->mesh_sae_pmksa_caching = 0;
 815
 816         eloop_cancel_timeout(peer_add_timer, wpa_s, NULL);
 817         peer_add_timer(wpa_s, NULL);
 818         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 819
 820         /* Send ctrl event */
 821         wpa_msg(wpa_s, MSG_INFO, MESH_PEER_CONNECTED MACSTR,
 822                 MAC2STR(sta->addr));
 823 }
 824
 825
 826 static void mesh_mpm_fsm(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 827                          enum plink_event event)
 828 {
 829         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 830         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 831         u16 reason = 0;
 832
 833         wpa_msg(wpa_s, MSG_DEBUG, "MPM " MACSTR " state %s event %s",
 834                 MAC2STR(sta->addr), mplstate[sta->plink_state],
 835                 mplevent[event]);
 836
 837         switch (sta->plink_state) {
 838         case PLINK_LISTEN:
 839                 switch (event) {
 840                 case CLS_ACPT:
 841                         mesh_mpm_fsm_restart(wpa_s, sta);
 842                         break;
 843                 case OPN_ACPT:
 844                         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_RCVD);
 845                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CONFIRM,
 846                                                    0);
 847                         break;
 848                 default:
 849                         break;
 850                 }
 851                 break;
 852         case PLINK_OPEN_SENT:
 853                 switch (event) {
 854                 case OPN_RJCT:
 855                 case CNF_RJCT:
 856                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 857                         /* fall-through */
 858                 case CLS_ACPT:
 859                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 860                         if (!reason)
 861                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 862                         eloop_register_timeout(
 863                                 conf->dot11MeshHoldingTimeout / 1000,
 864                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 865                                 plink_timer, wpa_s, sta);
 866                         mesh_mpm_send_plink_action(wpa_s, sta,
 867                                                    PLINK_CLOSE, reason);
 868                         break;
 869                 case OPN_ACPT:
 870                         /* retry timer is left untouched */
 871                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_OPEN_RCVD);
 872                         mesh_mpm_send_plink_action(wpa_s, sta,
 873                                                    PLINK_CONFIRM, 0);
 874                         break;
 875                 case CNF_ACPT:
 876                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_CNF_RCVD);
 877                         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 878                         eloop_register_timeout(
 879                                 conf->dot11MeshConfirmTimeout / 1000,
 880                                 (conf->dot11MeshConfirmTimeout % 1000) * 1000,
 881                                 plink_timer, wpa_s, sta);
 882                         break;
 883                 default:
 884                         break;
 885                 }
 886                 break;
 887         case PLINK_OPEN_RCVD:
 888                 switch (event) {
 889                 case OPN_RJCT:
 890                 case CNF_RJCT:
 891                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 892                         /* fall-through */
 893                 case CLS_ACPT:
 894                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 895                         if (!reason)
 896                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 897                         eloop_register_timeout(
 898                                 conf->dot11MeshHoldingTimeout / 1000,
 899                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 900                                 plink_timer, wpa_s, sta);
 901                         sta->mpm_close_reason = reason;
 902                         mesh_mpm_send_plink_action(wpa_s, sta,
 903                                                    PLINK_CLOSE, reason);
 904                         break;
 905                 case OPN_ACPT:
 906                         mesh_mpm_send_plink_action(wpa_s, sta,
 907                                                    PLINK_CONFIRM, 0);
 908                         break;
 909                 case CNF_ACPT:
 910                         if (conf->security & MESH_CONF_SEC_AMPE)
 911                                 mesh_rsn_derive_mtk(wpa_s, sta);
 912                         mesh_mpm_plink_estab(wpa_s, sta);
 913                         break;
 914                 default:
 915                         break;
 916                 }
 917                 break;
 918         case PLINK_CNF_RCVD:
 919                 switch (event) {
 920                 case OPN_RJCT:
 921                 case CNF_RJCT:
 922                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 923                         /* fall-through */
 924                 case CLS_ACPT:
 925                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 926                         if (!reason)
 927                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 928                         eloop_register_timeout(
 929                                 conf->dot11MeshHoldingTimeout / 1000,
 930                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 931                                 plink_timer, wpa_s, sta);
 932                         sta->mpm_close_reason = reason;
 933                         mesh_mpm_send_plink_action(wpa_s, sta,
 934                                                    PLINK_CLOSE, reason);
 935                         break;
 936                 case OPN_ACPT:
 937                         mesh_mpm_plink_estab(wpa_s, sta);
 938                         mesh_mpm_send_plink_action(wpa_s, sta,
 939                                                    PLINK_CONFIRM, 0);
 940                         break;
 941                 default:
 942                         break;
 943                 }
 944                 break;
 945         case PLINK_ESTAB:
 946                 switch (event) {
 947                 case CLS_ACPT:
 948                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 949                         reason = WLAN_REASON_MESH_CLOSE_RCVD;
 950
 951                         eloop_register_timeout(
 952                                 conf->dot11MeshHoldingTimeout / 1000,
 953                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 954                                 plink_timer, wpa_s, sta);
 955                         sta->mpm_close_reason = reason;
 956
 957                         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR
 958                                 " closed with reason %d",
 959                                 MAC2STR(sta->addr), reason);
 960
 961                         wpa_msg(wpa_s, MSG_INFO, MESH_PEER_DISCONNECTED MACSTR,
 962                                 MAC2STR(sta->addr));
 963
 964                         hapd->num_plinks--;
 965
 966                         mesh_mpm_send_plink_action(wpa_s, sta,
 967                                                    PLINK_CLOSE, reason);
 968                         break;
 969                 case OPN_ACPT:
 970                         mesh_mpm_send_plink_action(wpa_s, sta,
 971                                                    PLINK_CONFIRM, 0);
 972                         break;
 973                 default:
 974                         break;
 975                 }
 976                 break;
 977         case PLINK_HOLDING:
 978                 switch (event) {
 979                 case CLS_ACPT:
 980                         mesh_mpm_fsm_restart(wpa_s, sta);
 981                         break;
 982                 case OPN_ACPT:
 983                 case CNF_ACPT:
 984                 case OPN_RJCT:
 985                 case CNF_RJCT:
 986                         reason = sta->mpm_close_reason;
 987                         mesh_mpm_send_plink_action(wpa_s, sta,
 988                                                    PLINK_CLOSE, reason);
 989                         break;
 990                 default:
 991                         break;
 992                 }
 993                 break;
 994         default:
 995                 wpa_msg(wpa_s, MSG_DEBUG,
 996                         "Unsupported MPM event %s for state %s",
 997                         mplevent[event], mplstate[sta->plink_state]);
 998                 break;
 999         }
1000 }
1001
1002
1003 void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
1004                         const struct ieee80211_mgmt *mgmt, size_t len)
1005 {
1006         u8 action_field;
1007         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
1008         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
1009         struct sta_info *sta;
1010         u16 plid = 0, llid = 0;
1011         enum plink_event event;
1012         struct ieee802_11_elems elems;
1013         struct mesh_peer_mgmt_ie peer_mgmt_ie;
1014         const u8 *ies;
1015         size_t ie_len;
1016         int ret;
1017
1018         if (mgmt->u.action.category != WLAN_ACTION_SELF_PROTECTED)
1019                 return;
1020
1021         action_field = mgmt->u.action.u.slf_prot_action.action;
1022         if (action_field != PLINK_OPEN &&
1023             action_field != PLINK_CONFIRM &&
1024             action_field != PLINK_CLOSE)
1025                 return;
1026
1027         ies = mgmt->u.action.u.slf_prot_action.variable;
1028         ie_len = (const u8 *) mgmt + len -
1029                 mgmt->u.action.u.slf_prot_action.variable;
1030
1031         /* at least expect mesh id and peering mgmt */
1032         if (ie_len < 2 + 2) {
1033                 wpa_printf(MSG_DEBUG,
1034                            "MPM: Ignore too short action frame %u ie_len %u",
1035                            action_field, (unsigned int) ie_len);
1036                 return;
1037         }
1038         wpa_printf(MSG_DEBUG, "MPM: Received PLINK action %u", action_field);
1039
1040         if (action_field == PLINK_OPEN || action_field == PLINK_CONFIRM) {
1041                 wpa_printf(MSG_DEBUG, "MPM: Capability 0x%x",
1042                            WPA_GET_LE16(ies));
1043                 ies += 2;       /* capability */
1044                 ie_len -= 2;
1045         }
1046         if (action_field == PLINK_CONFIRM) {
1047                 wpa_printf(MSG_DEBUG, "MPM: AID 0x%x", WPA_GET_LE16(ies));
1048                 ies += 2;       /* aid */
1049                 ie_len -= 2;
1050         }
1051
1052         /* check for mesh peering, mesh id and mesh config IEs */
1053         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
1054                 wpa_printf(MSG_DEBUG, "MPM: Failed to parse PLINK IEs");
1055                 return;
1056         }
1057         if (!elems.peer_mgmt) {
1058                 wpa_printf(MSG_DEBUG,
1059                            "MPM: No Mesh Peering Management element");
1060                 return;
1061         }
1062         if (action_field != PLINK_CLOSE) {
1063                 if (!elems.mesh_id || !elems.mesh_config) {
1064                         wpa_printf(MSG_DEBUG,
1065                                    "MPM: No Mesh ID or Mesh Configuration element");
1066                         return;
1067                 }
1068
1069                 if (!matches_local(wpa_s, &elems)) {
1070                         wpa_printf(MSG_DEBUG,
1071                                    "MPM: Mesh ID or Mesh Configuration element do not match local MBSS");
1072                         return;
1073                 }
1074         }
1075
1076         ret = mesh_mpm_parse_peer_mgmt(wpa_s, action_field,
1077                                        elems.peer_mgmt,
1078                                        elems.peer_mgmt_len,
1079                                        &peer_mgmt_ie);
1080         if (ret) {
1081                 wpa_printf(MSG_DEBUG, "MPM: Mesh parsing rejected frame");
1082                 return;
1083         }
1084
1085         /* the sender's llid is our plid and vice-versa */
1086         plid = WPA_GET_LE16(peer_mgmt_ie.llid);
1087         if (peer_mgmt_ie.plid)
1088                 llid = WPA_GET_LE16(peer_mgmt_ie.plid);
1089         wpa_printf(MSG_DEBUG, "MPM: plid=0x%x llid=0x%x", plid, llid);
1090
1091         sta = ap_get_sta(hapd, mgmt->sa);
1092
1093         /*
1094          * If this is an open frame from an unknown STA, and this is an
1095          * open mesh, then go ahead and add the peer before proceeding.
1096          */
1097         if (!sta && action_field == PLINK_OPEN &&
1098             (!(mconf->security & MESH_CONF_SEC_AMPE) ||
1099              wpa_auth_pmksa_get(hapd->wpa_auth, mgmt->sa)))
1100                 sta = mesh_mpm_add_peer(wpa_s, mgmt->sa, &elems);
1101
1102         if (!sta) {
1103                 wpa_printf(MSG_DEBUG, "MPM: No STA entry for peer");
1104                 return;
1105         }
1106
1107 #ifdef CONFIG_SAE
1108         /* peer is in sae_accepted? */
1109         if (sta->sae && sta->sae->state != SAE_ACCEPTED) {
1110                 wpa_printf(MSG_DEBUG, "MPM: SAE not yet accepted for peer");
1111                 return;
1112         }
1113 #endif /* CONFIG_SAE */
1114
1115         if (!sta->my_lid)
1116                 mesh_mpm_init_link(wpa_s, sta);
1117
1118         if ((mconf->security & MESH_CONF_SEC_AMPE) &&
1119             mesh_rsn_process_ampe(wpa_s, sta, &elems,
1120                                   &mgmt->u.action.category,
1121                                   peer_mgmt_ie.chosen_pmk,
1122                                   ies, ie_len)) {
1123                 wpa_printf(MSG_DEBUG, "MPM: RSN process rejected frame");
1124                 return;
1125         }
1126
1127         if (sta->plink_state == PLINK_BLOCKED) {
1128                 wpa_printf(MSG_DEBUG, "MPM: PLINK_BLOCKED");
1129                 return;
1130         }
1131
1132         /* Now we will figure out the appropriate event... */
1133         switch (action_field) {
1134         case PLINK_OPEN:
1135                 if (plink_free_count(hapd) == 0) {
1136                         event = OPN_IGNR;
1137                         wpa_printf(MSG_INFO,
1138                                    "MPM: Peer link num over quota(%d)",
1139                                    hapd->max_plinks);
1140                 } else if (sta->peer_lid && sta->peer_lid != plid) {
1141                         event = OPN_IGNR;
1142                 } else {
1143                         sta->peer_lid = plid;
1144                         event = OPN_ACPT;
1145                 }
1146                 break;
1147         case PLINK_CONFIRM:
1148                 if (plink_free_count(hapd) == 0) {
1149                         event = CNF_IGNR;
1150                         wpa_printf(MSG_INFO,
1151                                    "MPM: Peer link num over quota(%d)",
1152                                    hapd->max_plinks);
1153                 } else if (sta->my_lid != llid ||
1154                            (sta->peer_lid && sta->peer_lid != plid)) {
1155                         event = CNF_IGNR;
1156                 } else {
1157                         if (!sta->peer_lid)
1158                                 sta->peer_lid = plid;
1159                         event = CNF_ACPT;
1160                 }
1161                 break;
1162         case PLINK_CLOSE:
1163                 if (sta->plink_state == PLINK_ESTAB)
1164                         /* Do not check for llid or plid. This does not
1165                          * follow the standard but since multiple plinks
1166                          * per cand are not supported, it is necessary in
1167                          * order to avoid a livelock when MP A sees an
1168                          * establish peer link to MP B but MP B does not
1169                          * see it. This can be caused by a timeout in
1170                          * B's peer link establishment or B being
1171                          * restarted.
1172                          */
1173                         event = CLS_ACPT;
1174                 else if (sta->peer_lid != plid)
1175                         event = CLS_IGNR;
1176                 else if (peer_mgmt_ie.plid && sta->my_lid != llid)
1177                         event = CLS_IGNR;
1178                 else
1179                         event = CLS_ACPT;
1180                 break;
1181         default:
1182                 /*
1183                  * This cannot be hit due to the action_field check above, but
1184                  * compilers may not be able to figure that out and can warn
1185                  * about uninitialized event below.
1186                  */
1187                 return;
1188         }
1189         mesh_mpm_fsm(wpa_s, sta, event);
1190 }
1191
1192
1193 /* called by ap_free_sta */
1194 void mesh_mpm_free_sta(struct hostapd_data *hapd, struct sta_info *sta)
1195 {
1196         if (sta->plink_state == PLINK_ESTAB)
1197                 hapd->num_plinks--;
1198         eloop_cancel_timeout(plink_timer, ELOOP_ALL_CTX, sta);
1199         eloop_cancel_timeout(mesh_auth_timer, ELOOP_ALL_CTX, sta);
1200 }