wpa_supplicant/mesh_mpm.c

   1 /*
   2  * WPA Supplicant - Basic mesh peer management
   3  * Copyright (c) 2013-2014, cozybit, Inc.  All rights reserved.
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "common/ieee802_11_defs.h"
  14 #include "ap/hostapd.h"
  15 #include "ap/sta_info.h"
  16 #include "ap/ieee802_11.h"
  17 #include "wpa_supplicant_i.h"
  18 #include "driver_i.h"
  19 #include "mesh_mpm.h"
  20 #include "mesh_rsn.h"
  21
  22 struct mesh_peer_mgmt_ie {
  23         const u8 *proto_id;
  24         const u8 *llid;
  25         const u8 *plid;
  26         const u8 *reason;
  27         const u8 *pmk;
  28 };
  29
  30 static void plink_timer(void *eloop_ctx, void *user_data);
  31
  32
  33 enum plink_event {
  34         PLINK_UNDEFINED,
  35         OPN_ACPT,
  36         OPN_RJCT,
  37         OPN_IGNR,
  38         CNF_ACPT,
  39         CNF_RJCT,
  40         CNF_IGNR,
  41         CLS_ACPT,
  42         CLS_IGNR
  43 };
  44
  45 static const char * const mplstate[] = {
  46         [PLINK_LISTEN] = "LISTEN",
  47         [PLINK_OPEN_SENT] = "OPEN_SENT",
  48         [PLINK_OPEN_RCVD] = "OPEN_RCVD",
  49         [PLINK_CNF_RCVD] = "CNF_RCVD",
  50         [PLINK_ESTAB] = "ESTAB",
  51         [PLINK_HOLDING] = "HOLDING",
  52         [PLINK_BLOCKED] = "BLOCKED"
  53 };
  54
  55 static const char * const mplevent[] = {
  56         [PLINK_UNDEFINED] = "UNDEFINED",
  57         [OPN_ACPT] = "OPN_ACPT",
  58         [OPN_RJCT] = "OPN_RJCT",
  59         [OPN_IGNR] = "OPN_IGNR",
  60         [CNF_ACPT] = "CNF_ACPT",
  61         [CNF_RJCT] = "CNF_RJCT",
  62         [CNF_IGNR] = "CNF_IGNR",
  63         [CLS_ACPT] = "CLS_ACPT",
  64         [CLS_IGNR] = "CLS_IGNR"
  65 };
  66
  67
  68 static int mesh_mpm_parse_peer_mgmt(struct wpa_supplicant *wpa_s,
  69                                     u8 action_field,
  70                                     const u8 *ie, size_t len,
  71                                     struct mesh_peer_mgmt_ie *mpm_ie)
  72 {
  73         os_memset(mpm_ie, 0, sizeof(*mpm_ie));
  74
  75         /* remove optional PMK at end */
  76         if (len >= 16) {
  77                 len -= 16;
  78                 mpm_ie->pmk = ie + len - 16;
  79         }
  80
  81         if ((action_field == PLINK_OPEN && len != 4) ||
  82             (action_field == PLINK_CONFIRM && len != 6) ||
  83             (action_field == PLINK_CLOSE && len != 6 && len != 8)) {
  84                 wpa_msg(wpa_s, MSG_DEBUG, "MPM: Invalid peer mgmt ie");
  85                 return -1;
  86         }
  87
  88         /* required fields */
  89         if (len < 4)
  90                 return -1;
  91         mpm_ie->proto_id = ie;
  92         mpm_ie->llid = ie + 2;
  93         ie += 4;
  94         len -= 4;
  95
  96         /* close reason is always present at end for close */
  97         if (action_field == PLINK_CLOSE) {
  98                 if (len < 2)
  99                         return -1;
 100                 mpm_ie->reason = ie + len - 2;
 101                 len -= 2;
 102         }
 103
 104         /* plid, present for confirm, and possibly close */
 105         if (len)
 106                 mpm_ie->plid = ie;
 107
 108         return 0;
 109 }
 110
 111
 112 static int plink_free_count(struct hostapd_data *hapd)
 113 {
 114         if (hapd->max_plinks > hapd->num_plinks)
 115                 return hapd->max_plinks - hapd->num_plinks;
 116         return 0;
 117 }
 118
 119
 120 static u16 copy_supp_rates(struct wpa_supplicant *wpa_s,
 121                            struct sta_info *sta,
 122                            struct ieee802_11_elems *elems)
 123 {
 124         if (!elems->supp_rates) {
 125                 wpa_msg(wpa_s, MSG_ERROR, "no supported rates from " MACSTR,
 126                         MAC2STR(sta->addr));
 127                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 128         }
 129
 130         if (elems->supp_rates_len + elems->ext_supp_rates_len >
 131             sizeof(sta->supported_rates)) {
 132                 wpa_msg(wpa_s, MSG_ERROR,
 133                         "Invalid supported rates element length " MACSTR
 134                         " %d+%d", MAC2STR(sta->addr), elems->supp_rates_len,
 135                         elems->ext_supp_rates_len);
 136                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 137         }
 138
 139         sta->supported_rates_len = merge_byte_arrays(
 140                 sta->supported_rates, sizeof(sta->supported_rates),
 141                 elems->supp_rates, elems->supp_rates_len,
 142                 elems->ext_supp_rates, elems->ext_supp_rates_len);
 143
 144         return WLAN_STATUS_SUCCESS;
 145 }
 146
 147
 148 /* return true if elems from a neighbor match this MBSS */
 149 static Boolean matches_local(struct wpa_supplicant *wpa_s,
 150                              struct ieee802_11_elems *elems)
 151 {
 152         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
 153
 154         if (elems->mesh_config_len < 5)
 155                 return FALSE;
 156
 157         return (mconf->meshid_len == elems->mesh_id_len &&
 158                 os_memcmp(mconf->meshid, elems->mesh_id,
 159                           elems->mesh_id_len) == 0 &&
 160                 mconf->mesh_pp_id == elems->mesh_config[0] &&
 161                 mconf->mesh_pm_id == elems->mesh_config[1] &&
 162                 mconf->mesh_cc_id == elems->mesh_config[2] &&
 163                 mconf->mesh_sp_id == elems->mesh_config[3] &&
 164                 mconf->mesh_auth_id == elems->mesh_config[4]);
 165 }
 166
 167
 168 /* check if local link id is already used with another peer */
 169 static Boolean llid_in_use(struct wpa_supplicant *wpa_s, u16 llid)
 170 {
 171         struct sta_info *sta;
 172         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 173
 174         for (sta = hapd->sta_list; sta; sta = sta->next) {
 175                 if (sta->my_lid == llid)
 176                         return TRUE;
 177         }
 178
 179         return FALSE;
 180 }
 181
 182
 183 /* generate an llid for a link and set to initial state */
 184 static void mesh_mpm_init_link(struct wpa_supplicant *wpa_s,
 185                                struct sta_info *sta)
 186 {
 187         u16 llid;
 188
 189         do {
 190                 if (os_get_random((u8 *) &llid, sizeof(llid)) < 0)
 191                         continue;
 192         } while (!llid || llid_in_use(wpa_s, llid));
 193
 194         sta->my_lid = llid;
 195         sta->peer_lid = 0;
 196
 197         /*
 198          * We do not use wpa_mesh_set_plink_state() here because there is no
 199          * entry in kernel yet.
 200          */
 201         sta->plink_state = PLINK_LISTEN;
 202 }
 203
 204
 205 static void mesh_mpm_send_plink_action(struct wpa_supplicant *wpa_s,
 206                                        struct sta_info *sta,
 207                                        enum plink_action_field type,
 208                                        u16 close_reason)
 209 {
 210         struct wpabuf *buf;
 211         struct hostapd_iface *ifmsh = wpa_s->ifmsh;
 212         struct hostapd_data *bss = ifmsh->bss[0];
 213         struct mesh_conf *conf = ifmsh->mconf;
 214         u8 supp_rates[2 + 2 + 32];
 215 #ifdef CONFIG_IEEE80211N
 216         u8 ht_capa_oper[2 + 26 + 2 + 22];
 217 #endif /* CONFIG_IEEE80211N */
 218         u8 *pos, *cat;
 219         u8 ie_len, add_plid = 0;
 220         int ret;
 221         int ampe = conf->security & MESH_CONF_SEC_AMPE;
 222         size_t buf_len;
 223
 224         if (!sta)
 225                 return;
 226
 227         buf_len = 2 +      /* capability info */
 228                   2 +      /* AID */
 229                   2 + 8 +  /* supported rates */
 230                   2 + (32 - 8) +
 231                   2 + 32 + /* mesh ID */
 232                   2 + 7 +  /* mesh config */
 233                   2 + 23 + /* peering management */
 234                   2 + 96 + /* AMPE */
 235                   2 + 16;  /* MIC */
 236 #ifdef CONFIG_IEEE80211N
 237         if (type != PLINK_CLOSE && wpa_s->mesh_ht_enabled) {
 238                 buf_len += 2 + 26 + /* HT capabilities */
 239                            2 + 22;  /* HT operation */
 240         }
 241 #endif /* CONFIG_IEEE80211N */
 242         buf = wpabuf_alloc(buf_len);
 243         if (!buf)
 244                 return;
 245
 246         cat = wpabuf_mhead_u8(buf);
 247         wpabuf_put_u8(buf, WLAN_ACTION_SELF_PROTECTED);
 248         wpabuf_put_u8(buf, type);
 249
 250         if (type != PLINK_CLOSE) {
 251                 u8 info;
 252
 253                 /* capability info */
 254                 wpabuf_put_le16(buf, ampe ? IEEE80211_CAP_PRIVACY : 0);
 255
 256                 /* aid */
 257                 if (type == PLINK_CONFIRM)
 258                         wpabuf_put_le16(buf, sta->peer_lid);
 259
 260                 /* IE: supp + ext. supp rates */
 261                 pos = hostapd_eid_supp_rates(bss, supp_rates);
 262                 pos = hostapd_eid_ext_supp_rates(bss, pos);
 263                 wpabuf_put_data(buf, supp_rates, pos - supp_rates);
 264
 265                 /* IE: Mesh ID */
 266                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 267                 wpabuf_put_u8(buf, conf->meshid_len);
 268                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 269
 270                 /* IE: mesh conf */
 271                 wpabuf_put_u8(buf, WLAN_EID_MESH_CONFIG);
 272                 wpabuf_put_u8(buf, 7);
 273                 wpabuf_put_u8(buf, conf->mesh_pp_id);
 274                 wpabuf_put_u8(buf, conf->mesh_pm_id);
 275                 wpabuf_put_u8(buf, conf->mesh_cc_id);
 276                 wpabuf_put_u8(buf, conf->mesh_sp_id);
 277                 wpabuf_put_u8(buf, conf->mesh_auth_id);
 278                 info = (bss->num_plinks > 63 ? 63 : bss->num_plinks) << 1;
 279                 /* TODO: Add Connected to Mesh Gate/AS subfields */
 280                 wpabuf_put_u8(buf, info);
 281                 /* always forwarding & accepting plinks for now */
 282                 wpabuf_put_u8(buf, 0x1 | 0x8);
 283         } else {        /* Peer closing frame */
 284                 /* IE: Mesh ID */
 285                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 286                 wpabuf_put_u8(buf, conf->meshid_len);
 287                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 288         }
 289
 290         /* IE: Mesh Peering Management element */
 291         ie_len = 4;
 292         if (ampe)
 293                 ie_len += PMKID_LEN;
 294         switch (type) {
 295         case PLINK_OPEN:
 296                 break;
 297         case PLINK_CONFIRM:
 298                 ie_len += 2;
 299                 add_plid = 1;
 300                 break;
 301         case PLINK_CLOSE:
 302                 ie_len += 2;
 303                 add_plid = 1;
 304                 ie_len += 2; /* reason code */
 305                 break;
 306         }
 307
 308         wpabuf_put_u8(buf, WLAN_EID_PEER_MGMT);
 309         wpabuf_put_u8(buf, ie_len);
 310         /* peering protocol */
 311         if (ampe)
 312                 wpabuf_put_le16(buf, 1);
 313         else
 314                 wpabuf_put_le16(buf, 0);
 315         wpabuf_put_le16(buf, sta->my_lid);
 316         if (add_plid)
 317                 wpabuf_put_le16(buf, sta->peer_lid);
 318         if (type == PLINK_CLOSE)
 319                 wpabuf_put_le16(buf, close_reason);
 320         if (ampe) {
 321                 if (sta->sae == NULL) {
 322                         wpa_msg(wpa_s, MSG_INFO, "Mesh MPM: no SAE session");
 323                         goto fail;
 324                 }
 325                 mesh_rsn_get_pmkid(wpa_s->mesh_rsn, sta,
 326                                    wpabuf_put(buf, PMKID_LEN));
 327         }
 328
 329 #ifdef CONFIG_IEEE80211N
 330         if (type != PLINK_CLOSE && wpa_s->mesh_ht_enabled) {
 331                 pos = hostapd_eid_ht_capabilities(bss, ht_capa_oper);
 332                 pos = hostapd_eid_ht_operation(bss, pos);
 333                 wpabuf_put_data(buf, ht_capa_oper, pos - ht_capa_oper);
 334         }
 335 #endif /* CONFIG_IEEE80211N */
 336
 337         if (ampe && mesh_rsn_protect_frame(wpa_s->mesh_rsn, sta, cat, buf)) {
 338                 wpa_msg(wpa_s, MSG_INFO,
 339                         "Mesh MPM: failed to add AMPE and MIC IE");
 340                 goto fail;
 341         }
 342
 343         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0,
 344                                   sta->addr, wpa_s->own_addr, wpa_s->own_addr,
 345                                   wpabuf_head(buf), wpabuf_len(buf), 0);
 346         if (ret < 0)
 347                 wpa_msg(wpa_s, MSG_INFO,
 348                         "Mesh MPM: failed to send peering frame");
 349
 350 fail:
 351         wpabuf_free(buf);
 352 }
 353
 354
 355 /* configure peering state in ours and driver's station entry */
 356 void wpa_mesh_set_plink_state(struct wpa_supplicant *wpa_s,
 357                               struct sta_info *sta,
 358                               enum mesh_plink_state state)
 359 {
 360         struct hostapd_sta_add_params params;
 361         int ret;
 362
 363         sta->plink_state = state;
 364
 365         os_memset(&params, 0, sizeof(params));
 366         params.addr = sta->addr;
 367         params.plink_state = state;
 368         params.set = 1;
 369
 370         wpa_msg(wpa_s, MSG_DEBUG, "MPM set " MACSTR " into %s",
 371                 MAC2STR(sta->addr), mplstate[state]);
 372         ret = wpa_drv_sta_add(wpa_s, &params);
 373         if (ret) {
 374                 wpa_msg(wpa_s, MSG_ERROR, "Driver failed to set " MACSTR
 375                         ": %d", MAC2STR(sta->addr), ret);
 376         }
 377 }
 378
 379
 380 static void mesh_mpm_fsm_restart(struct wpa_supplicant *wpa_s,
 381                                  struct sta_info *sta)
 382 {
 383         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 384
 385         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 386
 387         if (sta->mpm_close_reason == WLAN_REASON_MESH_CLOSE_RCVD) {
 388                 ap_free_sta(hapd, sta);
 389                 return;
 390         }
 391
 392         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_LISTEN);
 393         sta->my_lid = sta->peer_lid = sta->mpm_close_reason = 0;
 394         sta->mpm_retries = 0;
 395 }
 396
 397
 398 static void plink_timer(void *eloop_ctx, void *user_data)
 399 {
 400         struct wpa_supplicant *wpa_s = eloop_ctx;
 401         struct sta_info *sta = user_data;
 402         u16 reason = 0;
 403         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 404
 405         switch (sta->plink_state) {
 406         case PLINK_OPEN_RCVD:
 407         case PLINK_OPEN_SENT:
 408                 /* retry timer */
 409                 if (sta->mpm_retries < conf->dot11MeshMaxRetries) {
 410                         eloop_register_timeout(
 411                                 conf->dot11MeshRetryTimeout / 1000,
 412                                 (conf->dot11MeshRetryTimeout % 1000) * 1000,
 413                                 plink_timer, wpa_s, sta);
 414                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 415                         sta->mpm_retries++;
 416                         break;
 417                 }
 418                 reason = WLAN_REASON_MESH_MAX_RETRIES;
 419                 /* fall through on else */
 420
 421         case PLINK_CNF_RCVD:
 422                 /* confirm timer */
 423                 if (!reason)
 424                         reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
 425                 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 426                 eloop_register_timeout(conf->dot11MeshHoldingTimeout / 1000,
 427                         (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 428                         plink_timer, wpa_s, sta);
 429                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 430                 break;
 431         case PLINK_HOLDING:
 432                 /* holding timer */
 433                 mesh_mpm_fsm_restart(wpa_s, sta);
 434                 break;
 435         default:
 436                 break;
 437         }
 438 }
 439
 440
 441 /* initiate peering with station */
 442 static void
 443 mesh_mpm_plink_open(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 444                     enum mesh_plink_state next_state)
 445 {
 446         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 447
 448         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 449         eloop_register_timeout(conf->dot11MeshRetryTimeout / 1000,
 450                                (conf->dot11MeshRetryTimeout % 1000) * 1000,
 451                                plink_timer, wpa_s, sta);
 452         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 453         wpa_mesh_set_plink_state(wpa_s, sta, next_state);
 454 }
 455
 456
 457 int mesh_mpm_plink_close(struct hostapd_data *hapd,
 458                          struct sta_info *sta, void *ctx)
 459 {
 460         struct wpa_supplicant *wpa_s = ctx;
 461         int reason = WLAN_REASON_MESH_PEERING_CANCELLED;
 462
 463         if (sta) {
 464                 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 465                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 466                 wpa_printf(MSG_DEBUG, "MPM closing plink sta=" MACSTR,
 467                            MAC2STR(sta->addr));
 468                 eloop_cancel_timeout(plink_timer, wpa_s, sta);
 469                 return 0;
 470         }
 471
 472         return 1;
 473 }
 474
 475
 476 void mesh_mpm_deinit(struct wpa_supplicant *wpa_s, struct hostapd_iface *ifmsh)
 477 {
 478         struct hostapd_data *hapd = ifmsh->bss[0];
 479
 480         /* notify peers we're leaving */
 481         ap_for_each_sta(hapd, mesh_mpm_plink_close, wpa_s);
 482
 483         hapd->num_plinks = 0;
 484         hostapd_free_stas(hapd);
 485 }
 486
 487
 488 /* for mesh_rsn to indicate this peer has completed authentication, and we're
 489  * ready to start AMPE */
 490 void mesh_mpm_auth_peer(struct wpa_supplicant *wpa_s, const u8 *addr)
 491 {
 492         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 493         struct hostapd_sta_add_params params;
 494         struct sta_info *sta;
 495         int ret;
 496
 497         sta = ap_get_sta(data, addr);
 498         if (!sta) {
 499                 wpa_msg(wpa_s, MSG_DEBUG, "no such mesh peer");
 500                 return;
 501         }
 502
 503         /* TODO: Should do nothing if this STA is already authenticated, but
 504          * the AP code already sets this flag. */
 505         sta->flags |= WLAN_STA_AUTH;
 506
 507         mesh_rsn_init_ampe_sta(wpa_s, sta);
 508
 509         os_memset(&params, 0, sizeof(params));
 510         params.addr = sta->addr;
 511         params.flags = WPA_STA_AUTHENTICATED | WPA_STA_AUTHORIZED;
 512         params.set = 1;
 513
 514         wpa_msg(wpa_s, MSG_DEBUG, "MPM authenticating " MACSTR,
 515                 MAC2STR(sta->addr));
 516         ret = wpa_drv_sta_add(wpa_s, &params);
 517         if (ret) {
 518                 wpa_msg(wpa_s, MSG_ERROR,
 519                         "Driver failed to set " MACSTR ": %d",
 520                         MAC2STR(sta->addr), ret);
 521         }
 522
 523         if (!sta->my_lid)
 524                 mesh_mpm_init_link(wpa_s, sta);
 525
 526         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 527 }
 528
 529
 530 void wpa_mesh_new_mesh_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 531                             struct ieee802_11_elems *elems)
 532 {
 533         struct hostapd_sta_add_params params;
 534         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 535         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 536         struct sta_info *sta;
 537         struct wpa_ssid *ssid = wpa_s->current_ssid;
 538         int ret = 0;
 539
 540         sta = ap_get_sta(data, addr);
 541         if (!sta) {
 542                 sta = ap_sta_add(data, addr);
 543                 if (!sta)
 544                         return;
 545         }
 546
 547         /* initialize sta */
 548         if (copy_supp_rates(wpa_s, sta, elems))
 549                 return;
 550
 551         mesh_mpm_init_link(wpa_s, sta);
 552
 553 #ifdef CONFIG_IEEE80211N
 554         copy_sta_ht_capab(data, sta, elems->ht_capabilities,
 555                         elems->ht_capabilities_len);
 556         update_ht_state(data, sta);
 557 #endif /* CONFIG_IEEE80211N */
 558
 559         /* insert into driver */
 560         os_memset(&params, 0, sizeof(params));
 561         params.supp_rates = sta->supported_rates;
 562         params.supp_rates_len = sta->supported_rates_len;
 563         params.addr = addr;
 564         params.plink_state = sta->plink_state;
 565         params.aid = sta->peer_lid;
 566         params.listen_interval = 100;
 567         params.ht_capabilities = sta->ht_capabilities;
 568         params.flags |= WPA_STA_WMM;
 569         params.flags_mask |= WPA_STA_AUTHENTICATED;
 570         if (conf->security == MESH_CONF_SEC_NONE) {
 571                 params.flags |= WPA_STA_AUTHORIZED;
 572                 params.flags |= WPA_STA_AUTHENTICATED;
 573         } else {
 574                 sta->flags |= WLAN_STA_MFP;
 575                 params.flags |= WPA_STA_MFP;
 576         }
 577
 578         ret = wpa_drv_sta_add(wpa_s, &params);
 579         if (ret) {
 580                 wpa_msg(wpa_s, MSG_ERROR,
 581                         "Driver failed to insert " MACSTR ": %d",
 582                         MAC2STR(addr), ret);
 583                 return;
 584         }
 585
 586         if (ssid && ssid->no_auto_peer) {
 587                 wpa_msg(wpa_s, MSG_INFO, "will not initiate new peer link with "
 588                         MACSTR " because of no_auto_peer", MAC2STR(addr));
 589                 if (data->mesh_pending_auth) {
 590                         struct os_reltime age;
 591                         const struct ieee80211_mgmt *mgmt;
 592                         struct hostapd_frame_info fi;
 593
 594                         mgmt = wpabuf_head(data->mesh_pending_auth);
 595                         os_reltime_age(&data->mesh_pending_auth_time, &age);
 596                         if (age.sec < 2 &&
 597                             os_memcmp(mgmt->sa, addr, ETH_ALEN) == 0) {
 598                                 wpa_printf(MSG_DEBUG,
 599                                            "mesh: Process pending Authentication frame from %u.%06u seconds ago",
 600                                            (unsigned int) age.sec,
 601                                            (unsigned int) age.usec);
 602                                 os_memset(&fi, 0, sizeof(fi));
 603                                 ieee802_11_mgmt(
 604                                         data,
 605                                         wpabuf_head(data->mesh_pending_auth),
 606                                         wpabuf_len(data->mesh_pending_auth),
 607                                         &fi);
 608                         }
 609                         wpabuf_free(data->mesh_pending_auth);
 610                         data->mesh_pending_auth = NULL;
 611                 }
 612                 return;
 613         }
 614
 615         if (conf->security == MESH_CONF_SEC_NONE)
 616                 mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 617         else
 618                 mesh_rsn_auth_sae_sta(wpa_s, sta);
 619 }
 620
 621
 622 void mesh_mpm_mgmt_rx(struct wpa_supplicant *wpa_s, struct rx_mgmt *rx_mgmt)
 623 {
 624         struct hostapd_frame_info fi;
 625
 626         os_memset(&fi, 0, sizeof(fi));
 627         fi.datarate = rx_mgmt->datarate;
 628         fi.ssi_signal = rx_mgmt->ssi_signal;
 629         ieee802_11_mgmt(wpa_s->ifmsh->bss[0], rx_mgmt->frame,
 630                         rx_mgmt->frame_len, &fi);
 631 }
 632
 633
 634 static void mesh_mpm_plink_estab(struct wpa_supplicant *wpa_s,
 635                                  struct sta_info *sta)
 636 {
 637         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 638         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 639         u8 seq[6] = {};
 640
 641         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR " established",
 642                 MAC2STR(sta->addr));
 643
 644         if (conf->security & MESH_CONF_SEC_AMPE) {
 645                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 0, 0,
 646                                 seq, sizeof(seq), sta->mtk, sizeof(sta->mtk));
 647                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 1, 0,
 648                                 seq, sizeof(seq),
 649                                 sta->mgtk, sizeof(sta->mgtk));
 650                 wpa_drv_set_key(wpa_s, WPA_ALG_IGTK, sta->addr, 4, 0,
 651                                 seq, sizeof(seq),
 652                                 sta->mgtk, sizeof(sta->mgtk));
 653
 654                 wpa_hexdump_key(MSG_DEBUG, "mtk:", sta->mtk, sizeof(sta->mtk));
 655                 wpa_hexdump_key(MSG_DEBUG, "mgtk:",
 656                                 sta->mgtk, sizeof(sta->mgtk));
 657         }
 658
 659         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_ESTAB);
 660         hapd->num_plinks++;
 661
 662         sta->flags |= WLAN_STA_ASSOC;
 663
 664         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 665
 666         /* Send ctrl event */
 667         wpa_msg_ctrl(wpa_s, MSG_INFO, MESH_PEER_CONNECTED MACSTR,
 668                      MAC2STR(sta->addr));
 669 }
 670
 671
 672 static void mesh_mpm_fsm(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 673                          enum plink_event event)
 674 {
 675         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 676         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 677         u16 reason = 0;
 678
 679         wpa_msg(wpa_s, MSG_DEBUG, "MPM " MACSTR " state %s event %s",
 680                 MAC2STR(sta->addr), mplstate[sta->plink_state],
 681                 mplevent[event]);
 682
 683         switch (sta->plink_state) {
 684         case PLINK_LISTEN:
 685                 switch (event) {
 686                 case CLS_ACPT:
 687                         mesh_mpm_fsm_restart(wpa_s, sta);
 688                         break;
 689                 case OPN_ACPT:
 690                         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_RCVD);
 691                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CONFIRM,
 692                                                    0);
 693                         break;
 694                 default:
 695                         break;
 696                 }
 697                 break;
 698         case PLINK_OPEN_SENT:
 699                 switch (event) {
 700                 case OPN_RJCT:
 701                 case CNF_RJCT:
 702                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 703                         /* fall-through */
 704                 case CLS_ACPT:
 705                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 706                         if (!reason)
 707                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 708                         eloop_register_timeout(
 709                                 conf->dot11MeshHoldingTimeout / 1000,
 710                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 711                                 plink_timer, wpa_s, sta);
 712                         mesh_mpm_send_plink_action(wpa_s, sta,
 713                                                    PLINK_CLOSE, reason);
 714                         break;
 715                 case OPN_ACPT:
 716                         /* retry timer is left untouched */
 717                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_OPEN_RCVD);
 718                         mesh_mpm_send_plink_action(wpa_s, sta,
 719                                                    PLINK_CONFIRM, 0);
 720                         break;
 721                 case CNF_ACPT:
 722                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_CNF_RCVD);
 723                         eloop_register_timeout(
 724                                 conf->dot11MeshConfirmTimeout / 1000,
 725                                 (conf->dot11MeshConfirmTimeout % 1000) * 1000,
 726                                 plink_timer, wpa_s, sta);
 727                         break;
 728                 default:
 729                         break;
 730                 }
 731                 break;
 732         case PLINK_OPEN_RCVD:
 733                 switch (event) {
 734                 case OPN_RJCT:
 735                 case CNF_RJCT:
 736                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 737                         /* fall-through */
 738                 case CLS_ACPT:
 739                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 740                         if (!reason)
 741                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 742                         eloop_register_timeout(
 743                                 conf->dot11MeshHoldingTimeout / 1000,
 744                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 745                                 plink_timer, wpa_s, sta);
 746                         sta->mpm_close_reason = reason;
 747                         mesh_mpm_send_plink_action(wpa_s, sta,
 748                                                    PLINK_CLOSE, reason);
 749                         break;
 750                 case OPN_ACPT:
 751                         mesh_mpm_send_plink_action(wpa_s, sta,
 752                                                    PLINK_CONFIRM, 0);
 753                         break;
 754                 case CNF_ACPT:
 755                         if (conf->security & MESH_CONF_SEC_AMPE)
 756                                 mesh_rsn_derive_mtk(wpa_s, sta);
 757                         mesh_mpm_plink_estab(wpa_s, sta);
 758                         break;
 759                 default:
 760                         break;
 761                 }
 762                 break;
 763         case PLINK_CNF_RCVD:
 764                 switch (event) {
 765                 case OPN_RJCT:
 766                 case CNF_RJCT:
 767                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 768                         /* fall-through */
 769                 case CLS_ACPT:
 770                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 771                         if (!reason)
 772                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 773                         eloop_register_timeout(
 774                                 conf->dot11MeshHoldingTimeout / 1000,
 775                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 776                                 plink_timer, wpa_s, sta);
 777                         sta->mpm_close_reason = reason;
 778                         mesh_mpm_send_plink_action(wpa_s, sta,
 779                                                    PLINK_CLOSE, reason);
 780                         break;
 781                 case OPN_ACPT:
 782                         mesh_mpm_plink_estab(wpa_s, sta);
 783                         mesh_mpm_send_plink_action(wpa_s, sta,
 784                                                    PLINK_CONFIRM, 0);
 785                         break;
 786                 default:
 787                         break;
 788                 }
 789                 break;
 790         case PLINK_ESTAB:
 791                 switch (event) {
 792                 case CLS_ACPT:
 793                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 794                         reason = WLAN_REASON_MESH_CLOSE_RCVD;
 795
 796                         eloop_register_timeout(
 797                                 conf->dot11MeshHoldingTimeout / 1000,
 798                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 799                                 plink_timer, wpa_s, sta);
 800                         sta->mpm_close_reason = reason;
 801
 802                         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR
 803                                 " closed with reason %d",
 804                                 MAC2STR(sta->addr), reason);
 805
 806                         wpa_msg_ctrl(wpa_s, MSG_INFO,
 807                                      MESH_PEER_DISCONNECTED MACSTR,
 808                                      MAC2STR(sta->addr));
 809
 810                         hapd->num_plinks--;
 811
 812                         mesh_mpm_send_plink_action(wpa_s, sta,
 813                                                    PLINK_CLOSE, reason);
 814                         break;
 815                 case OPN_ACPT:
 816                         mesh_mpm_send_plink_action(wpa_s, sta,
 817                                                    PLINK_CONFIRM, 0);
 818                         break;
 819                 default:
 820                         break;
 821                 }
 822                 break;
 823         case PLINK_HOLDING:
 824                 switch (event) {
 825                 case CLS_ACPT:
 826                         mesh_mpm_fsm_restart(wpa_s, sta);
 827                         break;
 828                 case OPN_ACPT:
 829                 case CNF_ACPT:
 830                 case OPN_RJCT:
 831                 case CNF_RJCT:
 832                         reason = sta->mpm_close_reason;
 833                         mesh_mpm_send_plink_action(wpa_s, sta,
 834                                                    PLINK_CLOSE, reason);
 835                         break;
 836                 default:
 837                         break;
 838                 }
 839                 break;
 840         default:
 841                 wpa_msg(wpa_s, MSG_DEBUG,
 842                         "Unsupported MPM event %s for state %s",
 843                         mplevent[event], mplstate[sta->plink_state]);
 844                 break;
 845         }
 846 }
 847
 848
 849 void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
 850                         const struct ieee80211_mgmt *mgmt, size_t len)
 851 {
 852         u8 action_field;
 853         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 854         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
 855         struct sta_info *sta;
 856         u16 plid = 0, llid = 0;
 857         enum plink_event event;
 858         struct ieee802_11_elems elems;
 859         struct mesh_peer_mgmt_ie peer_mgmt_ie;
 860         const u8 *ies;
 861         size_t ie_len;
 862         int ret;
 863
 864         if (mgmt->u.action.category != WLAN_ACTION_SELF_PROTECTED)
 865                 return;
 866
 867         action_field = mgmt->u.action.u.slf_prot_action.action;
 868         if (action_field != PLINK_OPEN &&
 869             action_field != PLINK_CONFIRM &&
 870             action_field != PLINK_CLOSE)
 871                 return;
 872
 873         ies = mgmt->u.action.u.slf_prot_action.variable;
 874         ie_len = (const u8 *) mgmt + len -
 875                 mgmt->u.action.u.slf_prot_action.variable;
 876
 877         /* at least expect mesh id and peering mgmt */
 878         if (ie_len < 2 + 2) {
 879                 wpa_printf(MSG_DEBUG,
 880                            "MPM: Ignore too short action frame %u ie_len %u",
 881                            action_field, (unsigned int) ie_len);
 882                 return;
 883         }
 884         wpa_printf(MSG_DEBUG, "MPM: Received PLINK action %u", action_field);
 885
 886         if (action_field == PLINK_OPEN || action_field == PLINK_CONFIRM) {
 887                 wpa_printf(MSG_DEBUG, "MPM: Capability 0x%x",
 888                            WPA_GET_LE16(ies));
 889                 ies += 2;       /* capability */
 890                 ie_len -= 2;
 891         }
 892         if (action_field == PLINK_CONFIRM) {
 893                 wpa_printf(MSG_DEBUG, "MPM: AID 0x%x", WPA_GET_LE16(ies));
 894                 ies += 2;       /* aid */
 895                 ie_len -= 2;
 896         }
 897
 898         /* check for mesh peering, mesh id and mesh config IEs */
 899         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
 900                 wpa_printf(MSG_DEBUG, "MPM: Failed to parse PLINK IEs");
 901                 return;
 902         }
 903         if (!elems.peer_mgmt) {
 904                 wpa_printf(MSG_DEBUG,
 905                            "MPM: No Mesh Peering Management element");
 906                 return;
 907         }
 908         if (action_field != PLINK_CLOSE) {
 909                 if (!elems.mesh_id || !elems.mesh_config) {
 910                         wpa_printf(MSG_DEBUG,
 911                                    "MPM: No Mesh ID or Mesh Configuration element");
 912                         return;
 913                 }
 914
 915                 if (!matches_local(wpa_s, &elems)) {
 916                         wpa_printf(MSG_DEBUG,
 917                                    "MPM: Mesh ID or Mesh Configuration element do not match local MBSS");
 918                         return;
 919                 }
 920         }
 921
 922         ret = mesh_mpm_parse_peer_mgmt(wpa_s, action_field,
 923                                        elems.peer_mgmt,
 924                                        elems.peer_mgmt_len,
 925                                        &peer_mgmt_ie);
 926         if (ret) {
 927                 wpa_printf(MSG_DEBUG, "MPM: Mesh parsing rejected frame");
 928                 return;
 929         }
 930
 931         /* the sender's llid is our plid and vice-versa */
 932         plid = WPA_GET_LE16(peer_mgmt_ie.llid);
 933         if (peer_mgmt_ie.plid)
 934                 llid = WPA_GET_LE16(peer_mgmt_ie.plid);
 935         wpa_printf(MSG_DEBUG, "MPM: plid=0x%x llid=0x%x", plid, llid);
 936
 937         sta = ap_get_sta(hapd, mgmt->sa);
 938         if (!sta) {
 939                 wpa_printf(MSG_DEBUG, "MPM: No STA entry for peer");
 940                 return;
 941         }
 942
 943 #ifdef CONFIG_SAE
 944         /* peer is in sae_accepted? */
 945         if (sta->sae && sta->sae->state != SAE_ACCEPTED) {
 946                 wpa_printf(MSG_DEBUG, "MPM: SAE not yet accepted for peer");
 947                 return;
 948         }
 949 #endif /* CONFIG_SAE */
 950
 951         if (!sta->my_lid)
 952                 mesh_mpm_init_link(wpa_s, sta);
 953
 954         if ((mconf->security & MESH_CONF_SEC_AMPE) &&
 955             mesh_rsn_process_ampe(wpa_s, sta, &elems,
 956                                   &mgmt->u.action.category,
 957                                   ies, ie_len)) {
 958                 wpa_printf(MSG_DEBUG, "MPM: RSN process rejected frame");
 959                 return;
 960         }
 961
 962         if (sta->plink_state == PLINK_BLOCKED) {
 963                 wpa_printf(MSG_DEBUG, "MPM: PLINK_BLOCKED");
 964                 return;
 965         }
 966
 967         /* Now we will figure out the appropriate event... */
 968         switch (action_field) {
 969         case PLINK_OPEN:
 970                 if (plink_free_count(hapd) == 0) {
 971                         event = OPN_IGNR;
 972                         wpa_printf(MSG_INFO,
 973                                    "MPM: Peer link num over quota(%d)",
 974                                    hapd->max_plinks);
 975                 } else if (sta->peer_lid && sta->peer_lid != plid) {
 976                         event = OPN_IGNR;
 977                 } else {
 978                         sta->peer_lid = plid;
 979                         event = OPN_ACPT;
 980                 }
 981                 break;
 982         case PLINK_CONFIRM:
 983                 if (plink_free_count(hapd) == 0) {
 984                         event = CNF_IGNR;
 985                         wpa_printf(MSG_INFO,
 986                                    "MPM: Peer link num over quota(%d)",
 987                                    hapd->max_plinks);
 988                 } else if (sta->my_lid != llid ||
 989                            (sta->peer_lid && sta->peer_lid != plid)) {
 990                         event = CNF_IGNR;
 991                 } else {
 992                         if (!sta->peer_lid)
 993                                 sta->peer_lid = plid;
 994                         event = CNF_ACPT;
 995                 }
 996                 break;
 997         case PLINK_CLOSE:
 998                 if (sta->plink_state == PLINK_ESTAB)
 999                         /* Do not check for llid or plid. This does not
1000                          * follow the standard but since multiple plinks
1001                          * per cand are not supported, it is necessary in
1002                          * order to avoid a livelock when MP A sees an
1003                          * establish peer link to MP B but MP B does not
1004                          * see it. This can be caused by a timeout in
1005                          * B's peer link establishment or B being
1006                          * restarted.
1007                          */
1008                         event = CLS_ACPT;
1009                 else if (sta->peer_lid != plid)
1010                         event = CLS_IGNR;
1011                 else if (peer_mgmt_ie.plid && sta->my_lid != llid)
1012                         event = CLS_IGNR;
1013                 else
1014                         event = CLS_ACPT;
1015                 break;
1016         default:
1017                 /*
1018                  * This cannot be hit due to the action_field check above, but
1019                  * compilers may not be able to figure that out and can warn
1020                  * about uninitialized event below.
1021                  */
1022                 return;
1023         }
1024         mesh_mpm_fsm(wpa_s, sta, event);
1025 }
1026
1027
1028 /* called by ap_free_sta */
1029 void mesh_mpm_free_sta(struct sta_info *sta)
1030 {
1031         eloop_cancel_timeout(plink_timer, ELOOP_ALL_CTX, sta);
1032         eloop_cancel_timeout(mesh_auth_timer, ELOOP_ALL_CTX, sta);
1033 }