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         sta->plink_state = PLINK_LISTEN;
 197 }
 198
 199
 200 static void mesh_mpm_send_plink_action(struct wpa_supplicant *wpa_s,
 201                                        struct sta_info *sta,
 202                                        enum plink_action_field type,
 203                                        u16 close_reason)
 204 {
 205         struct wpabuf *buf;
 206         struct hostapd_iface *ifmsh = wpa_s->ifmsh;
 207         struct hostapd_data *bss = ifmsh->bss[0];
 208         struct mesh_conf *conf = ifmsh->mconf;
 209         u8 supp_rates[2 + 2 + 32];
 210 #ifdef CONFIG_IEEE80211N
 211         u8 ht_capa_oper[2 + 26 + 2 + 22];
 212 #endif /* CONFIG_IEEE80211N */
 213         u8 *pos, *cat;
 214         u8 ie_len, add_plid = 0;
 215         int ret;
 216         int ampe = conf->security & MESH_CONF_SEC_AMPE;
 217         size_t buf_len;
 218
 219         if (!sta)
 220                 return;
 221
 222         buf_len = 2 +      /* capability info */
 223                   2 +      /* AID */
 224                   2 + 8 +  /* supported rates */
 225                   2 + (32 - 8) +
 226                   2 + 32 + /* mesh ID */
 227                   2 + 7 +  /* mesh config */
 228                   2 + 23 + /* peering management */
 229                   2 + 96 + /* AMPE */
 230                   2 + 16;  /* MIC */
 231 #ifdef CONFIG_IEEE80211N
 232         if (type != PLINK_CLOSE &&
 233             wpa_s->current_ssid->mesh_ht_mode > CHAN_NO_HT) {
 234                 buf_len += 2 + 26 + /* HT capabilities */
 235                            2 + 22;  /* HT operation */
 236         }
 237 #endif /* CONFIG_IEEE80211N */
 238         buf = wpabuf_alloc(buf_len);
 239         if (!buf)
 240                 return;
 241
 242         cat = wpabuf_mhead_u8(buf);
 243         wpabuf_put_u8(buf, WLAN_ACTION_SELF_PROTECTED);
 244         wpabuf_put_u8(buf, type);
 245
 246         if (type != PLINK_CLOSE) {
 247                 /* capability info */
 248                 wpabuf_put_le16(buf, ampe ? IEEE80211_CAP_PRIVACY : 0);
 249
 250                 /* aid */
 251                 if (type == PLINK_CONFIRM)
 252                         wpabuf_put_le16(buf, sta->peer_lid);
 253
 254                 /* IE: supp + ext. supp rates */
 255                 pos = hostapd_eid_supp_rates(bss, supp_rates);
 256                 pos = hostapd_eid_ext_supp_rates(bss, pos);
 257                 wpabuf_put_data(buf, supp_rates, pos - supp_rates);
 258
 259                 /* IE: Mesh ID */
 260                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 261                 wpabuf_put_u8(buf, conf->meshid_len);
 262                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 263
 264                 /* IE: mesh conf */
 265                 wpabuf_put_u8(buf, WLAN_EID_MESH_CONFIG);
 266                 wpabuf_put_u8(buf, 7);
 267                 wpabuf_put_u8(buf, conf->mesh_pp_id);
 268                 wpabuf_put_u8(buf, conf->mesh_pm_id);
 269                 wpabuf_put_u8(buf, conf->mesh_cc_id);
 270                 wpabuf_put_u8(buf, conf->mesh_sp_id);
 271                 wpabuf_put_u8(buf, conf->mesh_auth_id);
 272                 /* TODO: formation info */
 273                 wpabuf_put_u8(buf, 0);
 274                 /* always forwarding & accepting plinks for now */
 275                 wpabuf_put_u8(buf, 0x1 | 0x8);
 276         } else {        /* Peer closing frame */
 277                 /* IE: Mesh ID */
 278                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 279                 wpabuf_put_u8(buf, conf->meshid_len);
 280                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 281         }
 282
 283         /* IE: Mesh Peering Management element */
 284         ie_len = 4;
 285         if (ampe)
 286                 ie_len += PMKID_LEN;
 287         switch (type) {
 288         case PLINK_OPEN:
 289                 break;
 290         case PLINK_CONFIRM:
 291                 ie_len += 2;
 292                 add_plid = 1;
 293                 break;
 294         case PLINK_CLOSE:
 295                 ie_len += 2;
 296                 add_plid = 1;
 297                 ie_len += 2; /* reason code */
 298                 break;
 299         }
 300
 301         wpabuf_put_u8(buf, WLAN_EID_PEER_MGMT);
 302         wpabuf_put_u8(buf, ie_len);
 303         /* peering protocol */
 304         if (ampe)
 305                 wpabuf_put_le16(buf, 1);
 306         else
 307                 wpabuf_put_le16(buf, 0);
 308         wpabuf_put_le16(buf, sta->my_lid);
 309         if (add_plid)
 310                 wpabuf_put_le16(buf, sta->peer_lid);
 311         if (type == PLINK_CLOSE)
 312                 wpabuf_put_le16(buf, close_reason);
 313         if (ampe) {
 314                 if (sta->sae == NULL) {
 315                         wpa_msg(wpa_s, MSG_INFO, "Mesh MPM: no SAE session");
 316                         goto fail;
 317                 }
 318                 mesh_rsn_get_pmkid(wpa_s->mesh_rsn, sta,
 319                                    wpabuf_put(buf, PMKID_LEN));
 320         }
 321
 322 #ifdef CONFIG_IEEE80211N
 323         if (type != PLINK_CLOSE &&
 324             wpa_s->current_ssid->mesh_ht_mode > CHAN_NO_HT) {
 325                 pos = hostapd_eid_ht_capabilities(bss, ht_capa_oper);
 326                 pos = hostapd_eid_ht_operation(bss, pos);
 327                 wpabuf_put_data(buf, ht_capa_oper, pos - ht_capa_oper);
 328         }
 329 #endif /* CONFIG_IEEE80211N */
 330
 331         if (ampe && mesh_rsn_protect_frame(wpa_s->mesh_rsn, sta, cat, buf)) {
 332                 wpa_msg(wpa_s, MSG_INFO,
 333                         "Mesh MPM: failed to add AMPE and MIC IE");
 334                 goto fail;
 335         }
 336
 337         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0,
 338                                   sta->addr, wpa_s->own_addr, wpa_s->own_addr,
 339                                   wpabuf_head(buf), wpabuf_len(buf), 0);
 340         if (ret < 0)
 341                 wpa_msg(wpa_s, MSG_INFO,
 342                         "Mesh MPM: failed to send peering frame");
 343
 344 fail:
 345         wpabuf_free(buf);
 346 }
 347
 348
 349 /* configure peering state in ours and driver's station entry */
 350 static void
 351 wpa_mesh_set_plink_state(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 352                          enum mesh_plink_state state)
 353 {
 354         struct hostapd_sta_add_params params;
 355         int ret;
 356
 357         sta->plink_state = state;
 358
 359         os_memset(&params, 0, sizeof(params));
 360         params.addr = sta->addr;
 361         params.plink_state = state;
 362         params.set = 1;
 363
 364         wpa_msg(wpa_s, MSG_DEBUG, "MPM set " MACSTR " into %s",
 365                 MAC2STR(sta->addr), mplstate[state]);
 366         ret = wpa_drv_sta_add(wpa_s, &params);
 367         if (ret) {
 368                 wpa_msg(wpa_s, MSG_ERROR, "Driver failed to set " MACSTR
 369                         ": %d", MAC2STR(sta->addr), ret);
 370         }
 371 }
 372
 373
 374 static void mesh_mpm_fsm_restart(struct wpa_supplicant *wpa_s,
 375                                  struct sta_info *sta)
 376 {
 377         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 378
 379         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 380
 381         if (sta->mpm_close_reason == WLAN_REASON_MESH_CLOSE_RCVD) {
 382                 ap_free_sta(hapd, sta);
 383                 return;
 384         }
 385
 386         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_LISTEN);
 387         sta->my_lid = sta->peer_lid = sta->mpm_close_reason = 0;
 388         sta->mpm_retries = 0;
 389 }
 390
 391
 392 static void plink_timer(void *eloop_ctx, void *user_data)
 393 {
 394         struct wpa_supplicant *wpa_s = eloop_ctx;
 395         struct sta_info *sta = user_data;
 396         u16 reason = 0;
 397         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 398
 399         switch (sta->plink_state) {
 400         case PLINK_OPEN_RCVD:
 401         case PLINK_OPEN_SENT:
 402                 /* retry timer */
 403                 if (sta->mpm_retries < conf->dot11MeshMaxRetries) {
 404                         eloop_register_timeout(
 405                                 conf->dot11MeshRetryTimeout / 1000,
 406                                 (conf->dot11MeshRetryTimeout % 1000) * 1000,
 407                                 plink_timer, wpa_s, sta);
 408                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 409                         sta->mpm_retries++;
 410                         break;
 411                 }
 412                 reason = WLAN_REASON_MESH_MAX_RETRIES;
 413                 /* fall through on else */
 414
 415         case PLINK_CNF_RCVD:
 416                 /* confirm timer */
 417                 if (!reason)
 418                         reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
 419                 sta->plink_state = PLINK_HOLDING;
 420                 eloop_register_timeout(conf->dot11MeshHoldingTimeout / 1000,
 421                         (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 422                         plink_timer, wpa_s, sta);
 423                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 424                 break;
 425         case PLINK_HOLDING:
 426                 /* holding timer */
 427                 mesh_mpm_fsm_restart(wpa_s, sta);
 428                 break;
 429         default:
 430                 break;
 431         }
 432 }
 433
 434
 435 /* initiate peering with station */
 436 static void
 437 mesh_mpm_plink_open(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 438                     enum mesh_plink_state next_state)
 439 {
 440         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 441
 442         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 443         eloop_register_timeout(conf->dot11MeshRetryTimeout / 1000,
 444                                (conf->dot11MeshRetryTimeout % 1000) * 1000,
 445                                plink_timer, wpa_s, sta);
 446         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 447         wpa_mesh_set_plink_state(wpa_s, sta, next_state);
 448 }
 449
 450
 451 int mesh_mpm_plink_close(struct hostapd_data *hapd,
 452                          struct sta_info *sta, void *ctx)
 453 {
 454         struct wpa_supplicant *wpa_s = ctx;
 455         int reason = WLAN_REASON_MESH_PEERING_CANCELLED;
 456
 457         if (sta) {
 458                 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 459                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 460                 wpa_printf(MSG_DEBUG, "MPM closing plink sta=" MACSTR,
 461                            MAC2STR(sta->addr));
 462                 eloop_cancel_timeout(plink_timer, wpa_s, sta);
 463                 return 0;
 464         }
 465
 466         return 1;
 467 }
 468
 469
 470 void mesh_mpm_deinit(struct wpa_supplicant *wpa_s, struct hostapd_iface *ifmsh)
 471 {
 472         struct hostapd_data *hapd = ifmsh->bss[0];
 473
 474         /* notify peers we're leaving */
 475         ap_for_each_sta(hapd, mesh_mpm_plink_close, wpa_s);
 476
 477         hapd->num_plinks = 0;
 478         hostapd_free_stas(hapd);
 479 }
 480
 481
 482 /* for mesh_rsn to indicate this peer has completed authentication, and we're
 483  * ready to start AMPE */
 484 void mesh_mpm_auth_peer(struct wpa_supplicant *wpa_s, const u8 *addr)
 485 {
 486         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 487         struct hostapd_sta_add_params params;
 488         struct sta_info *sta;
 489         int ret;
 490
 491         sta = ap_get_sta(data, addr);
 492         if (!sta) {
 493                 wpa_msg(wpa_s, MSG_DEBUG, "no such mesh peer");
 494                 return;
 495         }
 496
 497         /* TODO: Should do nothing if this STA is already authenticated, but
 498          * the AP code already sets this flag. */
 499         sta->flags |= WLAN_STA_AUTH;
 500
 501         mesh_rsn_init_ampe_sta(wpa_s, sta);
 502
 503         os_memset(&params, 0, sizeof(params));
 504         params.addr = sta->addr;
 505         params.flags = WPA_STA_AUTHENTICATED | WPA_STA_AUTHORIZED;
 506         params.set = 1;
 507
 508         wpa_msg(wpa_s, MSG_DEBUG, "MPM authenticating " MACSTR,
 509                 MAC2STR(sta->addr));
 510         ret = wpa_drv_sta_add(wpa_s, &params);
 511         if (ret) {
 512                 wpa_msg(wpa_s, MSG_ERROR,
 513                         "Driver failed to set " MACSTR ": %d",
 514                         MAC2STR(sta->addr), ret);
 515         }
 516
 517         if (!sta->my_lid)
 518                 mesh_mpm_init_link(wpa_s, sta);
 519
 520         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 521 }
 522
 523
 524 void wpa_mesh_new_mesh_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 525                             struct ieee802_11_elems *elems)
 526 {
 527         struct hostapd_sta_add_params params;
 528         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 529         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 530         struct sta_info *sta;
 531         struct wpa_ssid *ssid = wpa_s->current_ssid;
 532         int ret = 0;
 533
 534         sta = ap_get_sta(data, addr);
 535         if (!sta) {
 536                 sta = ap_sta_add(data, addr);
 537                 if (!sta)
 538                         return;
 539         }
 540
 541         /* initialize sta */
 542         if (copy_supp_rates(wpa_s, sta, elems))
 543                 return;
 544
 545         mesh_mpm_init_link(wpa_s, sta);
 546
 547 #ifdef CONFIG_IEEE80211N
 548         copy_sta_ht_capab(data, sta, elems->ht_capabilities,
 549                         elems->ht_capabilities_len);
 550         update_ht_state(data, sta);
 551 #endif /* CONFIG_IEEE80211N */
 552
 553         /* insert into driver */
 554         os_memset(&params, 0, sizeof(params));
 555         params.supp_rates = sta->supported_rates;
 556         params.supp_rates_len = sta->supported_rates_len;
 557         params.addr = addr;
 558         params.plink_state = sta->plink_state;
 559         params.aid = sta->peer_lid;
 560         params.listen_interval = 100;
 561         params.ht_capabilities = sta->ht_capabilities;
 562         params.flags |= WPA_STA_WMM;
 563         params.flags_mask |= WPA_STA_AUTHENTICATED;
 564         if (conf->security == MESH_CONF_SEC_NONE) {
 565                 params.flags |= WPA_STA_AUTHORIZED;
 566                 params.flags |= WPA_STA_AUTHENTICATED;
 567         } else {
 568                 sta->flags |= WLAN_STA_MFP;
 569                 params.flags |= WPA_STA_MFP;
 570         }
 571
 572         ret = wpa_drv_sta_add(wpa_s, &params);
 573         if (ret) {
 574                 wpa_msg(wpa_s, MSG_ERROR,
 575                         "Driver failed to insert " MACSTR ": %d",
 576                         MAC2STR(addr), ret);
 577                 return;
 578         }
 579
 580         if (ssid && ssid->no_auto_peer) {
 581                 wpa_msg(wpa_s, MSG_INFO, "will not initiate new peer link with "
 582                         MACSTR " because of no_auto_peer", MAC2STR(addr));
 583                 return;
 584         }
 585
 586         if (conf->security == MESH_CONF_SEC_NONE)
 587                 mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 588         else
 589                 mesh_rsn_auth_sae_sta(wpa_s, sta);
 590 }
 591
 592
 593 void mesh_mpm_mgmt_rx(struct wpa_supplicant *wpa_s, struct rx_mgmt *rx_mgmt)
 594 {
 595         struct hostapd_frame_info fi;
 596
 597         os_memset(&fi, 0, sizeof(fi));
 598         fi.datarate = rx_mgmt->datarate;
 599         fi.ssi_signal = rx_mgmt->ssi_signal;
 600         ieee802_11_mgmt(wpa_s->ifmsh->bss[0], rx_mgmt->frame,
 601                         rx_mgmt->frame_len, &fi);
 602 }
 603
 604
 605 static void mesh_mpm_plink_estab(struct wpa_supplicant *wpa_s,
 606                                  struct sta_info *sta)
 607 {
 608         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 609         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 610         u8 seq[6] = {};
 611
 612         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR " established",
 613                 MAC2STR(sta->addr));
 614
 615         if (conf->security & MESH_CONF_SEC_AMPE) {
 616                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 0, 0,
 617                                 seq, sizeof(seq), sta->mtk, sizeof(sta->mtk));
 618                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 1, 0,
 619                                 seq, sizeof(seq),
 620                                 sta->mgtk, sizeof(sta->mgtk));
 621                 wpa_drv_set_key(wpa_s, WPA_ALG_IGTK, sta->addr, 4, 0,
 622                                 seq, sizeof(seq),
 623                                 sta->mgtk, sizeof(sta->mgtk));
 624
 625                 wpa_hexdump_key(MSG_DEBUG, "mtk:", sta->mtk, sizeof(sta->mtk));
 626                 wpa_hexdump_key(MSG_DEBUG, "mgtk:",
 627                                 sta->mgtk, sizeof(sta->mgtk));
 628         }
 629
 630         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_ESTAB);
 631         hapd->num_plinks++;
 632
 633         sta->flags |= WLAN_STA_ASSOC;
 634
 635         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 636
 637         /* Send ctrl event */
 638         wpa_msg_ctrl(wpa_s, MSG_INFO, MESH_PEER_CONNECTED MACSTR,
 639                      MAC2STR(sta->addr));
 640 }
 641
 642
 643 static void mesh_mpm_fsm(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 644                          enum plink_event event)
 645 {
 646         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 647         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 648         u16 reason = 0;
 649
 650         wpa_msg(wpa_s, MSG_DEBUG, "MPM " MACSTR " state %s event %s",
 651                 MAC2STR(sta->addr), mplstate[sta->plink_state],
 652                 mplevent[event]);
 653
 654         switch (sta->plink_state) {
 655         case PLINK_LISTEN:
 656                 switch (event) {
 657                 case CLS_ACPT:
 658                         mesh_mpm_fsm_restart(wpa_s, sta);
 659                         break;
 660                 case OPN_ACPT:
 661                         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_RCVD);
 662                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CONFIRM,
 663                                                    0);
 664                         break;
 665                 default:
 666                         break;
 667                 }
 668                 break;
 669         case PLINK_OPEN_SENT:
 670                 switch (event) {
 671                 case OPN_RJCT:
 672                 case CNF_RJCT:
 673                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 674                         /* fall-through */
 675                 case CLS_ACPT:
 676                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 677                         if (!reason)
 678                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 679                         eloop_register_timeout(
 680                                 conf->dot11MeshHoldingTimeout / 1000,
 681                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 682                                 plink_timer, wpa_s, sta);
 683                         mesh_mpm_send_plink_action(wpa_s, sta,
 684                                                    PLINK_CLOSE, reason);
 685                         break;
 686                 case OPN_ACPT:
 687                         /* retry timer is left untouched */
 688                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_OPEN_RCVD);
 689                         mesh_mpm_send_plink_action(wpa_s, sta,
 690                                                    PLINK_CONFIRM, 0);
 691                         break;
 692                 case CNF_ACPT:
 693                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_CNF_RCVD);
 694                         eloop_register_timeout(
 695                                 conf->dot11MeshConfirmTimeout / 1000,
 696                                 (conf->dot11MeshConfirmTimeout % 1000) * 1000,
 697                                 plink_timer, wpa_s, sta);
 698                         break;
 699                 default:
 700                         break;
 701                 }
 702                 break;
 703         case PLINK_OPEN_RCVD:
 704                 switch (event) {
 705                 case OPN_RJCT:
 706                 case CNF_RJCT:
 707                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 708                         /* fall-through */
 709                 case CLS_ACPT:
 710                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 711                         if (!reason)
 712                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 713                         eloop_register_timeout(
 714                                 conf->dot11MeshHoldingTimeout / 1000,
 715                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 716                                 plink_timer, wpa_s, sta);
 717                         sta->mpm_close_reason = reason;
 718                         mesh_mpm_send_plink_action(wpa_s, sta,
 719                                                    PLINK_CLOSE, reason);
 720                         break;
 721                 case OPN_ACPT:
 722                         mesh_mpm_send_plink_action(wpa_s, sta,
 723                                                    PLINK_CONFIRM, 0);
 724                         break;
 725                 case CNF_ACPT:
 726                         if (conf->security & MESH_CONF_SEC_AMPE)
 727                                 mesh_rsn_derive_mtk(wpa_s, sta);
 728                         mesh_mpm_plink_estab(wpa_s, sta);
 729                         break;
 730                 default:
 731                         break;
 732                 }
 733                 break;
 734         case PLINK_CNF_RCVD:
 735                 switch (event) {
 736                 case OPN_RJCT:
 737                 case CNF_RJCT:
 738                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 739                         /* fall-through */
 740                 case CLS_ACPT:
 741                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 742                         if (!reason)
 743                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 744                         eloop_register_timeout(
 745                                 conf->dot11MeshHoldingTimeout / 1000,
 746                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 747                                 plink_timer, wpa_s, sta);
 748                         sta->mpm_close_reason = reason;
 749                         mesh_mpm_send_plink_action(wpa_s, sta,
 750                                                    PLINK_CLOSE, reason);
 751                         break;
 752                 case OPN_ACPT:
 753                         mesh_mpm_plink_estab(wpa_s, sta);
 754                         mesh_mpm_send_plink_action(wpa_s, sta,
 755                                                    PLINK_CONFIRM, 0);
 756                         break;
 757                 default:
 758                         break;
 759                 }
 760                 break;
 761         case PLINK_ESTAB:
 762                 switch (event) {
 763                 case CLS_ACPT:
 764                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 765                         reason = WLAN_REASON_MESH_CLOSE_RCVD;
 766
 767                         eloop_register_timeout(
 768                                 conf->dot11MeshHoldingTimeout / 1000,
 769                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 770                                 plink_timer, wpa_s, sta);
 771                         sta->mpm_close_reason = reason;
 772
 773                         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR
 774                                 " closed with reason %d",
 775                                 MAC2STR(sta->addr), reason);
 776
 777                         wpa_msg_ctrl(wpa_s, MSG_INFO,
 778                                      MESH_PEER_DISCONNECTED MACSTR,
 779                                      MAC2STR(sta->addr));
 780
 781                         hapd->num_plinks--;
 782
 783                         mesh_mpm_send_plink_action(wpa_s, sta,
 784                                                    PLINK_CLOSE, reason);
 785                         break;
 786                 case OPN_ACPT:
 787                         mesh_mpm_send_plink_action(wpa_s, sta,
 788                                                    PLINK_CONFIRM, 0);
 789                         break;
 790                 default:
 791                         break;
 792                 }
 793                 break;
 794         case PLINK_HOLDING:
 795                 switch (event) {
 796                 case CLS_ACPT:
 797                         mesh_mpm_fsm_restart(wpa_s, sta);
 798                         break;
 799                 case OPN_ACPT:
 800                 case CNF_ACPT:
 801                 case OPN_RJCT:
 802                 case CNF_RJCT:
 803                         reason = sta->mpm_close_reason;
 804                         mesh_mpm_send_plink_action(wpa_s, sta,
 805                                                    PLINK_CLOSE, reason);
 806                         break;
 807                 default:
 808                         break;
 809                 }
 810                 break;
 811         default:
 812                 wpa_msg(wpa_s, MSG_DEBUG,
 813                         "Unsupported MPM event %s for state %s",
 814                         mplevent[event], mplstate[sta->plink_state]);
 815                 break;
 816         }
 817 }
 818
 819
 820 void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
 821                         const struct ieee80211_mgmt *mgmt, size_t len)
 822 {
 823         u8 action_field;
 824         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 825         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
 826         struct sta_info *sta;
 827         u16 plid = 0, llid = 0;
 828         enum plink_event event;
 829         struct ieee802_11_elems elems;
 830         struct mesh_peer_mgmt_ie peer_mgmt_ie;
 831         const u8 *ies;
 832         size_t ie_len;
 833         int ret;
 834
 835         if (mgmt->u.action.category != WLAN_ACTION_SELF_PROTECTED)
 836                 return;
 837
 838         action_field = mgmt->u.action.u.slf_prot_action.action;
 839         if (action_field != PLINK_OPEN &&
 840             action_field != PLINK_CONFIRM &&
 841             action_field != PLINK_CLOSE)
 842                 return;
 843
 844         ies = mgmt->u.action.u.slf_prot_action.variable;
 845         ie_len = (const u8 *) mgmt + len -
 846                 mgmt->u.action.u.slf_prot_action.variable;
 847
 848         /* at least expect mesh id and peering mgmt */
 849         if (ie_len < 2 + 2) {
 850                 wpa_printf(MSG_DEBUG,
 851                            "MPM: Ignore too short action frame %u ie_len %u",
 852                            action_field, (unsigned int) ie_len);
 853                 return;
 854         }
 855         wpa_printf(MSG_DEBUG, "MPM: Received PLINK action %u", action_field);
 856
 857         if (action_field == PLINK_OPEN || action_field == PLINK_CONFIRM) {
 858                 wpa_printf(MSG_DEBUG, "MPM: Capability 0x%x",
 859                            WPA_GET_LE16(ies));
 860                 ies += 2;       /* capability */
 861                 ie_len -= 2;
 862         }
 863         if (action_field == PLINK_CONFIRM) {
 864                 wpa_printf(MSG_DEBUG, "MPM: AID 0x%x", WPA_GET_LE16(ies));
 865                 ies += 2;       /* aid */
 866                 ie_len -= 2;
 867         }
 868
 869         /* check for mesh peering, mesh id and mesh config IEs */
 870         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
 871                 wpa_printf(MSG_DEBUG, "MPM: Failed to parse PLINK IEs");
 872                 return;
 873         }
 874         if (!elems.peer_mgmt) {
 875                 wpa_printf(MSG_DEBUG,
 876                            "MPM: No Mesh Peering Management element");
 877                 return;
 878         }
 879         if (action_field != PLINK_CLOSE) {
 880                 if (!elems.mesh_id || !elems.mesh_config) {
 881                         wpa_printf(MSG_DEBUG,
 882                                    "MPM: No Mesh ID or Mesh Configuration element");
 883                         return;
 884                 }
 885
 886                 if (!matches_local(wpa_s, &elems)) {
 887                         wpa_printf(MSG_DEBUG,
 888                                    "MPM: Mesh ID or Mesh Configuration element do not match local MBSS");
 889                         return;
 890                 }
 891         }
 892
 893         ret = mesh_mpm_parse_peer_mgmt(wpa_s, action_field,
 894                                        elems.peer_mgmt,
 895                                        elems.peer_mgmt_len,
 896                                        &peer_mgmt_ie);
 897         if (ret) {
 898                 wpa_printf(MSG_DEBUG, "MPM: Mesh parsing rejected frame");
 899                 return;
 900         }
 901
 902         /* the sender's llid is our plid and vice-versa */
 903         plid = WPA_GET_LE16(peer_mgmt_ie.llid);
 904         if (peer_mgmt_ie.plid)
 905                 llid = WPA_GET_LE16(peer_mgmt_ie.plid);
 906         wpa_printf(MSG_DEBUG, "MPM: plid=0x%x llid=0x%x", plid, llid);
 907
 908         sta = ap_get_sta(hapd, mgmt->sa);
 909         if (!sta) {
 910                 wpa_printf(MSG_DEBUG, "MPM: No STA entry for peer");
 911                 return;
 912         }
 913
 914 #ifdef CONFIG_SAE
 915         /* peer is in sae_accepted? */
 916         if (sta->sae && sta->sae->state != SAE_ACCEPTED) {
 917                 wpa_printf(MSG_DEBUG, "MPM: SAE not yet accepted for peer");
 918                 return;
 919         }
 920 #endif /* CONFIG_SAE */
 921
 922         if (!sta->my_lid)
 923                 mesh_mpm_init_link(wpa_s, sta);
 924
 925         if ((mconf->security & MESH_CONF_SEC_AMPE) &&
 926             mesh_rsn_process_ampe(wpa_s, sta, &elems,
 927                                   &mgmt->u.action.category,
 928                                   ies, ie_len)) {
 929                 wpa_printf(MSG_DEBUG, "MPM: RSN process rejected frame");
 930                 return;
 931         }
 932
 933         if (sta->plink_state == PLINK_BLOCKED) {
 934                 wpa_printf(MSG_DEBUG, "MPM: PLINK_BLOCKED");
 935                 return;
 936         }
 937
 938         /* Now we will figure out the appropriate event... */
 939         switch (action_field) {
 940         case PLINK_OPEN:
 941                 if (plink_free_count(hapd) == 0) {
 942                         event = OPN_IGNR;
 943                         wpa_printf(MSG_INFO,
 944                                    "MPM: Peer link num over quota(%d)",
 945                                    hapd->max_plinks);
 946                 } else if (sta->peer_lid && sta->peer_lid != plid) {
 947                         event = OPN_IGNR;
 948                 } else {
 949                         sta->peer_lid = plid;
 950                         event = OPN_ACPT;
 951                 }
 952                 break;
 953         case PLINK_CONFIRM:
 954                 if (plink_free_count(hapd) == 0) {
 955                         event = CNF_IGNR;
 956                         wpa_printf(MSG_INFO,
 957                                    "MPM: Peer link num over quota(%d)",
 958                                    hapd->max_plinks);
 959                 } else if (sta->my_lid != llid ||
 960                            (sta->peer_lid && sta->peer_lid != plid)) {
 961                         event = CNF_IGNR;
 962                 } else {
 963                         if (!sta->peer_lid)
 964                                 sta->peer_lid = plid;
 965                         event = CNF_ACPT;
 966                 }
 967                 break;
 968         case PLINK_CLOSE:
 969                 if (sta->plink_state == PLINK_ESTAB)
 970                         /* Do not check for llid or plid. This does not
 971                          * follow the standard but since multiple plinks
 972                          * per cand are not supported, it is necessary in
 973                          * order to avoid a livelock when MP A sees an
 974                          * establish peer link to MP B but MP B does not
 975                          * see it. This can be caused by a timeout in
 976                          * B's peer link establishment or B being
 977                          * restarted.
 978                          */
 979                         event = CLS_ACPT;
 980                 else if (sta->peer_lid != plid)
 981                         event = CLS_IGNR;
 982                 else if (peer_mgmt_ie.plid && sta->my_lid != llid)
 983                         event = CLS_IGNR;
 984                 else
 985                         event = CLS_ACPT;
 986                 break;
 987         default:
 988                 /*
 989                  * This cannot be hit due to the action_field check above, but
 990                  * compilers may not be able to figure that out and can warn
 991                  * about uninitialized event below.
 992                  */
 993                 return;
 994         }
 995         mesh_mpm_fsm(wpa_s, sta, event);
 996 }
 997
 998
 999 /* called by ap_free_sta */
1000 void mesh_mpm_free_sta(struct sta_info *sta)
1001 {
1002         eloop_cancel_timeout(plink_timer, ELOOP_ALL_CTX, sta);
1003         eloop_cancel_timeout(mesh_auth_timer, ELOOP_ALL_CTX, sta);
1004 }