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_hexdump_key(MSG_DEBUG, "mesh: MTK", sta->mtk, sta->mtk_len);
 797                 /* TODO: support for other ciphers */
 798                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 0, 0,
 799                                 seq, sizeof(seq), sta->mtk, sta->mtk_len);
 800
 801                 wpa_hexdump_key(MSG_DEBUG, "mesh: RX MGTK",
 802                                 sta->mgtk, sta->mgtk_len);
 803                 /* TODO: support for other ciphers */
 804                 /* FIX: key index.. */
 805                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 1, 0,
 806                                 seq, sizeof(seq),
 807                                 sta->mgtk, sta->mgtk_len);
 808
 809                 if (sta->igtk_len) {
 810                         wpa_hexdump_key(MSG_DEBUG, "RX IGTK",
 811                                         sta->igtk, sta->igtk_len);
 812                         /* FIX: key index.. */
 813                         wpa_drv_set_key(wpa_s, WPA_ALG_IGTK, sta->addr, 4, 0,
 814                                         seq, sizeof(seq),
 815                                         sta->igtk, sta->igtk_len);
 816                 }
 817         }
 818
 819         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_ESTAB);
 820         hapd->num_plinks++;
 821
 822         sta->flags |= WLAN_STA_ASSOC;
 823         sta->mesh_sae_pmksa_caching = 0;
 824
 825         eloop_cancel_timeout(peer_add_timer, wpa_s, NULL);
 826         peer_add_timer(wpa_s, NULL);
 827         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 828
 829         /* Send ctrl event */
 830         wpa_msg(wpa_s, MSG_INFO, MESH_PEER_CONNECTED MACSTR,
 831                 MAC2STR(sta->addr));
 832 }
 833
 834
 835 static void mesh_mpm_fsm(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 836                          enum plink_event event)
 837 {
 838         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 839         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 840         u16 reason = 0;
 841
 842         wpa_msg(wpa_s, MSG_DEBUG, "MPM " MACSTR " state %s event %s",
 843                 MAC2STR(sta->addr), mplstate[sta->plink_state],
 844                 mplevent[event]);
 845
 846         switch (sta->plink_state) {
 847         case PLINK_LISTEN:
 848                 switch (event) {
 849                 case CLS_ACPT:
 850                         mesh_mpm_fsm_restart(wpa_s, sta);
 851                         break;
 852                 case OPN_ACPT:
 853                         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_RCVD);
 854                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CONFIRM,
 855                                                    0);
 856                         break;
 857                 default:
 858                         break;
 859                 }
 860                 break;
 861         case PLINK_OPEN_SENT:
 862                 switch (event) {
 863                 case OPN_RJCT:
 864                 case CNF_RJCT:
 865                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 866                         /* fall-through */
 867                 case CLS_ACPT:
 868                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 869                         if (!reason)
 870                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 871                         eloop_register_timeout(
 872                                 conf->dot11MeshHoldingTimeout / 1000,
 873                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 874                                 plink_timer, wpa_s, sta);
 875                         mesh_mpm_send_plink_action(wpa_s, sta,
 876                                                    PLINK_CLOSE, reason);
 877                         break;
 878                 case OPN_ACPT:
 879                         /* retry timer is left untouched */
 880                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_OPEN_RCVD);
 881                         mesh_mpm_send_plink_action(wpa_s, sta,
 882                                                    PLINK_CONFIRM, 0);
 883                         break;
 884                 case CNF_ACPT:
 885                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_CNF_RCVD);
 886                         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 887                         eloop_register_timeout(
 888                                 conf->dot11MeshConfirmTimeout / 1000,
 889                                 (conf->dot11MeshConfirmTimeout % 1000) * 1000,
 890                                 plink_timer, wpa_s, sta);
 891                         break;
 892                 default:
 893                         break;
 894                 }
 895                 break;
 896         case PLINK_OPEN_RCVD:
 897                 switch (event) {
 898                 case OPN_RJCT:
 899                 case CNF_RJCT:
 900                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 901                         /* fall-through */
 902                 case CLS_ACPT:
 903                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 904                         if (!reason)
 905                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 906                         eloop_register_timeout(
 907                                 conf->dot11MeshHoldingTimeout / 1000,
 908                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 909                                 plink_timer, wpa_s, sta);
 910                         sta->mpm_close_reason = reason;
 911                         mesh_mpm_send_plink_action(wpa_s, sta,
 912                                                    PLINK_CLOSE, reason);
 913                         break;
 914                 case OPN_ACPT:
 915                         mesh_mpm_send_plink_action(wpa_s, sta,
 916                                                    PLINK_CONFIRM, 0);
 917                         break;
 918                 case CNF_ACPT:
 919                         if (conf->security & MESH_CONF_SEC_AMPE)
 920                                 mesh_rsn_derive_mtk(wpa_s, sta);
 921                         mesh_mpm_plink_estab(wpa_s, sta);
 922                         break;
 923                 default:
 924                         break;
 925                 }
 926                 break;
 927         case PLINK_CNF_RCVD:
 928                 switch (event) {
 929                 case OPN_RJCT:
 930                 case CNF_RJCT:
 931                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 932                         /* fall-through */
 933                 case CLS_ACPT:
 934                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 935                         if (!reason)
 936                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 937                         eloop_register_timeout(
 938                                 conf->dot11MeshHoldingTimeout / 1000,
 939                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 940                                 plink_timer, wpa_s, sta);
 941                         sta->mpm_close_reason = reason;
 942                         mesh_mpm_send_plink_action(wpa_s, sta,
 943                                                    PLINK_CLOSE, reason);
 944                         break;
 945                 case OPN_ACPT:
 946                         if (conf->security & MESH_CONF_SEC_AMPE)
 947                                 mesh_rsn_derive_mtk(wpa_s, sta);
 948                         mesh_mpm_plink_estab(wpa_s, sta);
 949                         mesh_mpm_send_plink_action(wpa_s, sta,
 950                                                    PLINK_CONFIRM, 0);
 951                         break;
 952                 default:
 953                         break;
 954                 }
 955                 break;
 956         case PLINK_ESTAB:
 957                 switch (event) {
 958                 case CLS_ACPT:
 959                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 960                         reason = WLAN_REASON_MESH_CLOSE_RCVD;
 961
 962                         eloop_register_timeout(
 963                                 conf->dot11MeshHoldingTimeout / 1000,
 964                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 965                                 plink_timer, wpa_s, sta);
 966                         sta->mpm_close_reason = reason;
 967
 968                         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR
 969                                 " closed with reason %d",
 970                                 MAC2STR(sta->addr), reason);
 971
 972                         wpa_msg(wpa_s, MSG_INFO, MESH_PEER_DISCONNECTED MACSTR,
 973                                 MAC2STR(sta->addr));
 974
 975                         hapd->num_plinks--;
 976
 977                         mesh_mpm_send_plink_action(wpa_s, sta,
 978                                                    PLINK_CLOSE, reason);
 979                         break;
 980                 case OPN_ACPT:
 981                         mesh_mpm_send_plink_action(wpa_s, sta,
 982                                                    PLINK_CONFIRM, 0);
 983                         break;
 984                 default:
 985                         break;
 986                 }
 987                 break;
 988         case PLINK_HOLDING:
 989                 switch (event) {
 990                 case CLS_ACPT:
 991                         mesh_mpm_fsm_restart(wpa_s, sta);
 992                         break;
 993                 case OPN_ACPT:
 994                 case CNF_ACPT:
 995                 case OPN_RJCT:
 996                 case CNF_RJCT:
 997                         reason = sta->mpm_close_reason;
 998                         mesh_mpm_send_plink_action(wpa_s, sta,
 999                                                    PLINK_CLOSE, reason);
1000                         break;
1001                 default:
1002                         break;
1003                 }
1004                 break;
1005         default:
1006                 wpa_msg(wpa_s, MSG_DEBUG,
1007                         "Unsupported MPM event %s for state %s",
1008                         mplevent[event], mplstate[sta->plink_state]);
1009                 break;
1010         }
1011 }
1012
1013
1014 void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
1015                         const struct ieee80211_mgmt *mgmt, size_t len)
1016 {
1017         u8 action_field;
1018         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
1019         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
1020         struct sta_info *sta;
1021         u16 plid = 0, llid = 0;
1022         enum plink_event event;
1023         struct ieee802_11_elems elems;
1024         struct mesh_peer_mgmt_ie peer_mgmt_ie;
1025         const u8 *ies;
1026         size_t ie_len;
1027         int ret;
1028
1029         if (mgmt->u.action.category != WLAN_ACTION_SELF_PROTECTED)
1030                 return;
1031
1032         action_field = mgmt->u.action.u.slf_prot_action.action;
1033         if (action_field != PLINK_OPEN &&
1034             action_field != PLINK_CONFIRM &&
1035             action_field != PLINK_CLOSE)
1036                 return;
1037
1038         ies = mgmt->u.action.u.slf_prot_action.variable;
1039         ie_len = (const u8 *) mgmt + len -
1040                 mgmt->u.action.u.slf_prot_action.variable;
1041
1042         /* at least expect mesh id and peering mgmt */
1043         if (ie_len < 2 + 2) {
1044                 wpa_printf(MSG_DEBUG,
1045                            "MPM: Ignore too short action frame %u ie_len %u",
1046                            action_field, (unsigned int) ie_len);
1047                 return;
1048         }
1049         wpa_printf(MSG_DEBUG, "MPM: Received PLINK action %u", action_field);
1050
1051         if (action_field == PLINK_OPEN || action_field == PLINK_CONFIRM) {
1052                 wpa_printf(MSG_DEBUG, "MPM: Capability 0x%x",
1053                            WPA_GET_LE16(ies));
1054                 ies += 2;       /* capability */
1055                 ie_len -= 2;
1056         }
1057         if (action_field == PLINK_CONFIRM) {
1058                 wpa_printf(MSG_DEBUG, "MPM: AID 0x%x", WPA_GET_LE16(ies));
1059                 ies += 2;       /* aid */
1060                 ie_len -= 2;
1061         }
1062
1063         /* check for mesh peering, mesh id and mesh config IEs */
1064         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
1065                 wpa_printf(MSG_DEBUG, "MPM: Failed to parse PLINK IEs");
1066                 return;
1067         }
1068         if (!elems.peer_mgmt) {
1069                 wpa_printf(MSG_DEBUG,
1070                            "MPM: No Mesh Peering Management element");
1071                 return;
1072         }
1073         if (action_field != PLINK_CLOSE) {
1074                 if (!elems.mesh_id || !elems.mesh_config) {
1075                         wpa_printf(MSG_DEBUG,
1076                                    "MPM: No Mesh ID or Mesh Configuration element");
1077                         return;
1078                 }
1079
1080                 if (!matches_local(wpa_s, &elems)) {
1081                         wpa_printf(MSG_DEBUG,
1082                                    "MPM: Mesh ID or Mesh Configuration element do not match local MBSS");
1083                         return;
1084                 }
1085         }
1086
1087         ret = mesh_mpm_parse_peer_mgmt(wpa_s, action_field,
1088                                        elems.peer_mgmt,
1089                                        elems.peer_mgmt_len,
1090                                        &peer_mgmt_ie);
1091         if (ret) {
1092                 wpa_printf(MSG_DEBUG, "MPM: Mesh parsing rejected frame");
1093                 return;
1094         }
1095
1096         /* the sender's llid is our plid and vice-versa */
1097         plid = WPA_GET_LE16(peer_mgmt_ie.llid);
1098         if (peer_mgmt_ie.plid)
1099                 llid = WPA_GET_LE16(peer_mgmt_ie.plid);
1100         wpa_printf(MSG_DEBUG, "MPM: plid=0x%x llid=0x%x", plid, llid);
1101
1102         sta = ap_get_sta(hapd, mgmt->sa);
1103
1104         /*
1105          * If this is an open frame from an unknown STA, and this is an
1106          * open mesh, then go ahead and add the peer before proceeding.
1107          */
1108         if (!sta && action_field == PLINK_OPEN &&
1109             (!(mconf->security & MESH_CONF_SEC_AMPE) ||
1110              wpa_auth_pmksa_get(hapd->wpa_auth, mgmt->sa)))
1111                 sta = mesh_mpm_add_peer(wpa_s, mgmt->sa, &elems);
1112
1113         if (!sta) {
1114                 wpa_printf(MSG_DEBUG, "MPM: No STA entry for peer");
1115                 return;
1116         }
1117
1118 #ifdef CONFIG_SAE
1119         /* peer is in sae_accepted? */
1120         if (sta->sae && sta->sae->state != SAE_ACCEPTED) {
1121                 wpa_printf(MSG_DEBUG, "MPM: SAE not yet accepted for peer");
1122                 return;
1123         }
1124 #endif /* CONFIG_SAE */
1125
1126         if (!sta->my_lid)
1127                 mesh_mpm_init_link(wpa_s, sta);
1128
1129         if ((mconf->security & MESH_CONF_SEC_AMPE) &&
1130             mesh_rsn_process_ampe(wpa_s, sta, &elems,
1131                                   &mgmt->u.action.category,
1132                                   peer_mgmt_ie.chosen_pmk,
1133                                   ies, ie_len)) {
1134                 wpa_printf(MSG_DEBUG, "MPM: RSN process rejected frame");
1135                 return;
1136         }
1137
1138         if (sta->plink_state == PLINK_BLOCKED) {
1139                 wpa_printf(MSG_DEBUG, "MPM: PLINK_BLOCKED");
1140                 return;
1141         }
1142
1143         /* Now we will figure out the appropriate event... */
1144         switch (action_field) {
1145         case PLINK_OPEN:
1146                 if (plink_free_count(hapd) == 0) {
1147                         event = OPN_IGNR;
1148                         wpa_printf(MSG_INFO,
1149                                    "MPM: Peer link num over quota(%d)",
1150                                    hapd->max_plinks);
1151                 } else if (sta->peer_lid && sta->peer_lid != plid) {
1152                         event = OPN_IGNR;
1153                 } else {
1154                         sta->peer_lid = plid;
1155                         event = OPN_ACPT;
1156                 }
1157                 break;
1158         case PLINK_CONFIRM:
1159                 if (plink_free_count(hapd) == 0) {
1160                         event = CNF_IGNR;
1161                         wpa_printf(MSG_INFO,
1162                                    "MPM: Peer link num over quota(%d)",
1163                                    hapd->max_plinks);
1164                 } else if (sta->my_lid != llid ||
1165                            (sta->peer_lid && sta->peer_lid != plid)) {
1166                         event = CNF_IGNR;
1167                 } else {
1168                         if (!sta->peer_lid)
1169                                 sta->peer_lid = plid;
1170                         event = CNF_ACPT;
1171                 }
1172                 break;
1173         case PLINK_CLOSE:
1174                 if (sta->plink_state == PLINK_ESTAB)
1175                         /* Do not check for llid or plid. This does not
1176                          * follow the standard but since multiple plinks
1177                          * per cand are not supported, it is necessary in
1178                          * order to avoid a livelock when MP A sees an
1179                          * establish peer link to MP B but MP B does not
1180                          * see it. This can be caused by a timeout in
1181                          * B's peer link establishment or B being
1182                          * restarted.
1183                          */
1184                         event = CLS_ACPT;
1185                 else if (sta->peer_lid != plid)
1186                         event = CLS_IGNR;
1187                 else if (peer_mgmt_ie.plid && sta->my_lid != llid)
1188                         event = CLS_IGNR;
1189                 else
1190                         event = CLS_ACPT;
1191                 break;
1192         default:
1193                 /*
1194                  * This cannot be hit due to the action_field check above, but
1195                  * compilers may not be able to figure that out and can warn
1196                  * about uninitialized event below.
1197                  */
1198                 return;
1199         }
1200         mesh_mpm_fsm(wpa_s, sta, event);
1201 }
1202
1203
1204 /* called by ap_free_sta */
1205 void mesh_mpm_free_sta(struct hostapd_data *hapd, struct sta_info *sta)
1206 {
1207         if (sta->plink_state == PLINK_ESTAB)
1208                 hapd->num_plinks--;
1209         eloop_cancel_timeout(plink_timer, ELOOP_ALL_CTX, sta);
1210         eloop_cancel_timeout(mesh_auth_timer, ELOOP_ALL_CTX, sta);
1211 }