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                 u8 info;
 248
 249                 /* capability info */
 250                 wpabuf_put_le16(buf, ampe ? IEEE80211_CAP_PRIVACY : 0);
 251
 252                 /* aid */
 253                 if (type == PLINK_CONFIRM)
 254                         wpabuf_put_le16(buf, sta->peer_lid);
 255
 256                 /* IE: supp + ext. supp rates */
 257                 pos = hostapd_eid_supp_rates(bss, supp_rates);
 258                 pos = hostapd_eid_ext_supp_rates(bss, pos);
 259                 wpabuf_put_data(buf, supp_rates, pos - supp_rates);
 260
 261                 /* IE: Mesh ID */
 262                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 263                 wpabuf_put_u8(buf, conf->meshid_len);
 264                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 265
 266                 /* IE: mesh conf */
 267                 wpabuf_put_u8(buf, WLAN_EID_MESH_CONFIG);
 268                 wpabuf_put_u8(buf, 7);
 269                 wpabuf_put_u8(buf, conf->mesh_pp_id);
 270                 wpabuf_put_u8(buf, conf->mesh_pm_id);
 271                 wpabuf_put_u8(buf, conf->mesh_cc_id);
 272                 wpabuf_put_u8(buf, conf->mesh_sp_id);
 273                 wpabuf_put_u8(buf, conf->mesh_auth_id);
 274                 info = (bss->num_plinks > 63 ? 63 : bss->num_plinks) << 1;
 275                 /* TODO: Add Connected to Mesh Gate/AS subfields */
 276                 wpabuf_put_u8(buf, info);
 277                 /* always forwarding & accepting plinks for now */
 278                 wpabuf_put_u8(buf, 0x1 | 0x8);
 279         } else {        /* Peer closing frame */
 280                 /* IE: Mesh ID */
 281                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 282                 wpabuf_put_u8(buf, conf->meshid_len);
 283                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 284         }
 285
 286         /* IE: Mesh Peering Management element */
 287         ie_len = 4;
 288         if (ampe)
 289                 ie_len += PMKID_LEN;
 290         switch (type) {
 291         case PLINK_OPEN:
 292                 break;
 293         case PLINK_CONFIRM:
 294                 ie_len += 2;
 295                 add_plid = 1;
 296                 break;
 297         case PLINK_CLOSE:
 298                 ie_len += 2;
 299                 add_plid = 1;
 300                 ie_len += 2; /* reason code */
 301                 break;
 302         }
 303
 304         wpabuf_put_u8(buf, WLAN_EID_PEER_MGMT);
 305         wpabuf_put_u8(buf, ie_len);
 306         /* peering protocol */
 307         if (ampe)
 308                 wpabuf_put_le16(buf, 1);
 309         else
 310                 wpabuf_put_le16(buf, 0);
 311         wpabuf_put_le16(buf, sta->my_lid);
 312         if (add_plid)
 313                 wpabuf_put_le16(buf, sta->peer_lid);
 314         if (type == PLINK_CLOSE)
 315                 wpabuf_put_le16(buf, close_reason);
 316         if (ampe) {
 317                 if (sta->sae == NULL) {
 318                         wpa_msg(wpa_s, MSG_INFO, "Mesh MPM: no SAE session");
 319                         goto fail;
 320                 }
 321                 mesh_rsn_get_pmkid(wpa_s->mesh_rsn, sta,
 322                                    wpabuf_put(buf, PMKID_LEN));
 323         }
 324
 325 #ifdef CONFIG_IEEE80211N
 326         if (type != PLINK_CLOSE &&
 327             wpa_s->current_ssid->mesh_ht_mode > CHAN_NO_HT) {
 328                 pos = hostapd_eid_ht_capabilities(bss, ht_capa_oper);
 329                 pos = hostapd_eid_ht_operation(bss, pos);
 330                 wpabuf_put_data(buf, ht_capa_oper, pos - ht_capa_oper);
 331         }
 332 #endif /* CONFIG_IEEE80211N */
 333
 334         if (ampe && mesh_rsn_protect_frame(wpa_s->mesh_rsn, sta, cat, buf)) {
 335                 wpa_msg(wpa_s, MSG_INFO,
 336                         "Mesh MPM: failed to add AMPE and MIC IE");
 337                 goto fail;
 338         }
 339
 340         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0,
 341                                   sta->addr, wpa_s->own_addr, wpa_s->own_addr,
 342                                   wpabuf_head(buf), wpabuf_len(buf), 0);
 343         if (ret < 0)
 344                 wpa_msg(wpa_s, MSG_INFO,
 345                         "Mesh MPM: failed to send peering frame");
 346
 347 fail:
 348         wpabuf_free(buf);
 349 }
 350
 351
 352 /* configure peering state in ours and driver's station entry */
 353 static void
 354 wpa_mesh_set_plink_state(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 355                          enum mesh_plink_state state)
 356 {
 357         struct hostapd_sta_add_params params;
 358         int ret;
 359
 360         sta->plink_state = state;
 361
 362         os_memset(&params, 0, sizeof(params));
 363         params.addr = sta->addr;
 364         params.plink_state = state;
 365         params.set = 1;
 366
 367         wpa_msg(wpa_s, MSG_DEBUG, "MPM set " MACSTR " into %s",
 368                 MAC2STR(sta->addr), mplstate[state]);
 369         ret = wpa_drv_sta_add(wpa_s, &params);
 370         if (ret) {
 371                 wpa_msg(wpa_s, MSG_ERROR, "Driver failed to set " MACSTR
 372                         ": %d", MAC2STR(sta->addr), ret);
 373         }
 374 }
 375
 376
 377 static void mesh_mpm_fsm_restart(struct wpa_supplicant *wpa_s,
 378                                  struct sta_info *sta)
 379 {
 380         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 381
 382         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 383
 384         if (sta->mpm_close_reason == WLAN_REASON_MESH_CLOSE_RCVD) {
 385                 ap_free_sta(hapd, sta);
 386                 return;
 387         }
 388
 389         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_LISTEN);
 390         sta->my_lid = sta->peer_lid = sta->mpm_close_reason = 0;
 391         sta->mpm_retries = 0;
 392 }
 393
 394
 395 static void plink_timer(void *eloop_ctx, void *user_data)
 396 {
 397         struct wpa_supplicant *wpa_s = eloop_ctx;
 398         struct sta_info *sta = user_data;
 399         u16 reason = 0;
 400         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 401
 402         switch (sta->plink_state) {
 403         case PLINK_OPEN_RCVD:
 404         case PLINK_OPEN_SENT:
 405                 /* retry timer */
 406                 if (sta->mpm_retries < conf->dot11MeshMaxRetries) {
 407                         eloop_register_timeout(
 408                                 conf->dot11MeshRetryTimeout / 1000,
 409                                 (conf->dot11MeshRetryTimeout % 1000) * 1000,
 410                                 plink_timer, wpa_s, sta);
 411                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 412                         sta->mpm_retries++;
 413                         break;
 414                 }
 415                 reason = WLAN_REASON_MESH_MAX_RETRIES;
 416                 /* fall through on else */
 417
 418         case PLINK_CNF_RCVD:
 419                 /* confirm timer */
 420                 if (!reason)
 421                         reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
 422                 sta->plink_state = PLINK_HOLDING;
 423                 eloop_register_timeout(conf->dot11MeshHoldingTimeout / 1000,
 424                         (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 425                         plink_timer, wpa_s, sta);
 426                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 427                 break;
 428         case PLINK_HOLDING:
 429                 /* holding timer */
 430                 mesh_mpm_fsm_restart(wpa_s, sta);
 431                 break;
 432         default:
 433                 break;
 434         }
 435 }
 436
 437
 438 /* initiate peering with station */
 439 static void
 440 mesh_mpm_plink_open(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 441                     enum mesh_plink_state next_state)
 442 {
 443         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 444
 445         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 446         eloop_register_timeout(conf->dot11MeshRetryTimeout / 1000,
 447                                (conf->dot11MeshRetryTimeout % 1000) * 1000,
 448                                plink_timer, wpa_s, sta);
 449         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 450         wpa_mesh_set_plink_state(wpa_s, sta, next_state);
 451 }
 452
 453
 454 int mesh_mpm_plink_close(struct hostapd_data *hapd,
 455                          struct sta_info *sta, void *ctx)
 456 {
 457         struct wpa_supplicant *wpa_s = ctx;
 458         int reason = WLAN_REASON_MESH_PEERING_CANCELLED;
 459
 460         if (sta) {
 461                 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 462                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 463                 wpa_printf(MSG_DEBUG, "MPM closing plink sta=" MACSTR,
 464                            MAC2STR(sta->addr));
 465                 eloop_cancel_timeout(plink_timer, wpa_s, sta);
 466                 return 0;
 467         }
 468
 469         return 1;
 470 }
 471
 472
 473 void mesh_mpm_deinit(struct wpa_supplicant *wpa_s, struct hostapd_iface *ifmsh)
 474 {
 475         struct hostapd_data *hapd = ifmsh->bss[0];
 476
 477         /* notify peers we're leaving */
 478         ap_for_each_sta(hapd, mesh_mpm_plink_close, wpa_s);
 479
 480         hapd->num_plinks = 0;
 481         hostapd_free_stas(hapd);
 482 }
 483
 484
 485 /* for mesh_rsn to indicate this peer has completed authentication, and we're
 486  * ready to start AMPE */
 487 void mesh_mpm_auth_peer(struct wpa_supplicant *wpa_s, const u8 *addr)
 488 {
 489         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 490         struct hostapd_sta_add_params params;
 491         struct sta_info *sta;
 492         int ret;
 493
 494         sta = ap_get_sta(data, addr);
 495         if (!sta) {
 496                 wpa_msg(wpa_s, MSG_DEBUG, "no such mesh peer");
 497                 return;
 498         }
 499
 500         /* TODO: Should do nothing if this STA is already authenticated, but
 501          * the AP code already sets this flag. */
 502         sta->flags |= WLAN_STA_AUTH;
 503
 504         mesh_rsn_init_ampe_sta(wpa_s, sta);
 505
 506         os_memset(&params, 0, sizeof(params));
 507         params.addr = sta->addr;
 508         params.flags = WPA_STA_AUTHENTICATED | WPA_STA_AUTHORIZED;
 509         params.set = 1;
 510
 511         wpa_msg(wpa_s, MSG_DEBUG, "MPM authenticating " MACSTR,
 512                 MAC2STR(sta->addr));
 513         ret = wpa_drv_sta_add(wpa_s, &params);
 514         if (ret) {
 515                 wpa_msg(wpa_s, MSG_ERROR,
 516                         "Driver failed to set " MACSTR ": %d",
 517                         MAC2STR(sta->addr), ret);
 518         }
 519
 520         if (!sta->my_lid)
 521                 mesh_mpm_init_link(wpa_s, sta);
 522
 523         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 524 }
 525
 526
 527 void wpa_mesh_new_mesh_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 528                             struct ieee802_11_elems *elems)
 529 {
 530         struct hostapd_sta_add_params params;
 531         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 532         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 533         struct sta_info *sta;
 534         struct wpa_ssid *ssid = wpa_s->current_ssid;
 535         int ret = 0;
 536
 537         sta = ap_get_sta(data, addr);
 538         if (!sta) {
 539                 sta = ap_sta_add(data, addr);
 540                 if (!sta)
 541                         return;
 542         }
 543
 544         /* initialize sta */
 545         if (copy_supp_rates(wpa_s, sta, elems))
 546                 return;
 547
 548         mesh_mpm_init_link(wpa_s, sta);
 549
 550 #ifdef CONFIG_IEEE80211N
 551         copy_sta_ht_capab(data, sta, elems->ht_capabilities,
 552                         elems->ht_capabilities_len);
 553         update_ht_state(data, sta);
 554 #endif /* CONFIG_IEEE80211N */
 555
 556         /* insert into driver */
 557         os_memset(&params, 0, sizeof(params));
 558         params.supp_rates = sta->supported_rates;
 559         params.supp_rates_len = sta->supported_rates_len;
 560         params.addr = addr;
 561         params.plink_state = sta->plink_state;
 562         params.aid = sta->peer_lid;
 563         params.listen_interval = 100;
 564         params.ht_capabilities = sta->ht_capabilities;
 565         params.flags |= WPA_STA_WMM;
 566         params.flags_mask |= WPA_STA_AUTHENTICATED;
 567         if (conf->security == MESH_CONF_SEC_NONE) {
 568                 params.flags |= WPA_STA_AUTHORIZED;
 569                 params.flags |= WPA_STA_AUTHENTICATED;
 570         } else {
 571                 sta->flags |= WLAN_STA_MFP;
 572                 params.flags |= WPA_STA_MFP;
 573         }
 574
 575         ret = wpa_drv_sta_add(wpa_s, &params);
 576         if (ret) {
 577                 wpa_msg(wpa_s, MSG_ERROR,
 578                         "Driver failed to insert " MACSTR ": %d",
 579                         MAC2STR(addr), ret);
 580                 return;
 581         }
 582
 583         if (ssid && ssid->no_auto_peer) {
 584                 wpa_msg(wpa_s, MSG_INFO, "will not initiate new peer link with "
 585                         MACSTR " because of no_auto_peer", MAC2STR(addr));
 586                 if (data->mesh_pending_auth) {
 587                         struct os_reltime age;
 588                         const struct ieee80211_mgmt *mgmt;
 589                         struct hostapd_frame_info fi;
 590
 591                         mgmt = wpabuf_head(data->mesh_pending_auth);
 592                         os_reltime_age(&data->mesh_pending_auth_time, &age);
 593                         if (age.sec < 2 &&
 594                             os_memcmp(mgmt->sa, addr, ETH_ALEN) == 0) {
 595                                 wpa_printf(MSG_DEBUG,
 596                                            "mesh: Process pending Authentication frame from %u.%06u seconds ago",
 597                                            (unsigned int) age.sec,
 598                                            (unsigned int) age.usec);
 599                                 os_memset(&fi, 0, sizeof(fi));
 600                                 ieee802_11_mgmt(
 601                                         data,
 602                                         wpabuf_head(data->mesh_pending_auth),
 603                                         wpabuf_len(data->mesh_pending_auth),
 604                                         &fi);
 605                         }
 606                         wpabuf_free(data->mesh_pending_auth);
 607                         data->mesh_pending_auth = NULL;
 608                 }
 609                 return;
 610         }
 611
 612         if (conf->security == MESH_CONF_SEC_NONE)
 613                 mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 614         else
 615                 mesh_rsn_auth_sae_sta(wpa_s, sta);
 616 }
 617
 618
 619 void mesh_mpm_mgmt_rx(struct wpa_supplicant *wpa_s, struct rx_mgmt *rx_mgmt)
 620 {
 621         struct hostapd_frame_info fi;
 622
 623         os_memset(&fi, 0, sizeof(fi));
 624         fi.datarate = rx_mgmt->datarate;
 625         fi.ssi_signal = rx_mgmt->ssi_signal;
 626         ieee802_11_mgmt(wpa_s->ifmsh->bss[0], rx_mgmt->frame,
 627                         rx_mgmt->frame_len, &fi);
 628 }
 629
 630
 631 static void mesh_mpm_plink_estab(struct wpa_supplicant *wpa_s,
 632                                  struct sta_info *sta)
 633 {
 634         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 635         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 636         u8 seq[6] = {};
 637
 638         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR " established",
 639                 MAC2STR(sta->addr));
 640
 641         if (conf->security & MESH_CONF_SEC_AMPE) {
 642                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 0, 0,
 643                                 seq, sizeof(seq), sta->mtk, sizeof(sta->mtk));
 644                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 1, 0,
 645                                 seq, sizeof(seq),
 646                                 sta->mgtk, sizeof(sta->mgtk));
 647                 wpa_drv_set_key(wpa_s, WPA_ALG_IGTK, sta->addr, 4, 0,
 648                                 seq, sizeof(seq),
 649                                 sta->mgtk, sizeof(sta->mgtk));
 650
 651                 wpa_hexdump_key(MSG_DEBUG, "mtk:", sta->mtk, sizeof(sta->mtk));
 652                 wpa_hexdump_key(MSG_DEBUG, "mgtk:",
 653                                 sta->mgtk, sizeof(sta->mgtk));
 654         }
 655
 656         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_ESTAB);
 657         hapd->num_plinks++;
 658
 659         sta->flags |= WLAN_STA_ASSOC;
 660
 661         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 662
 663         /* Send ctrl event */
 664         wpa_msg_ctrl(wpa_s, MSG_INFO, MESH_PEER_CONNECTED MACSTR,
 665                      MAC2STR(sta->addr));
 666 }
 667
 668
 669 static void mesh_mpm_fsm(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 670                          enum plink_event event)
 671 {
 672         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 673         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 674         u16 reason = 0;
 675
 676         wpa_msg(wpa_s, MSG_DEBUG, "MPM " MACSTR " state %s event %s",
 677                 MAC2STR(sta->addr), mplstate[sta->plink_state],
 678                 mplevent[event]);
 679
 680         switch (sta->plink_state) {
 681         case PLINK_LISTEN:
 682                 switch (event) {
 683                 case CLS_ACPT:
 684                         mesh_mpm_fsm_restart(wpa_s, sta);
 685                         break;
 686                 case OPN_ACPT:
 687                         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_RCVD);
 688                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CONFIRM,
 689                                                    0);
 690                         break;
 691                 default:
 692                         break;
 693                 }
 694                 break;
 695         case PLINK_OPEN_SENT:
 696                 switch (event) {
 697                 case OPN_RJCT:
 698                 case CNF_RJCT:
 699                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 700                         /* fall-through */
 701                 case CLS_ACPT:
 702                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 703                         if (!reason)
 704                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 705                         eloop_register_timeout(
 706                                 conf->dot11MeshHoldingTimeout / 1000,
 707                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 708                                 plink_timer, wpa_s, sta);
 709                         mesh_mpm_send_plink_action(wpa_s, sta,
 710                                                    PLINK_CLOSE, reason);
 711                         break;
 712                 case OPN_ACPT:
 713                         /* retry timer is left untouched */
 714                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_OPEN_RCVD);
 715                         mesh_mpm_send_plink_action(wpa_s, sta,
 716                                                    PLINK_CONFIRM, 0);
 717                         break;
 718                 case CNF_ACPT:
 719                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_CNF_RCVD);
 720                         eloop_register_timeout(
 721                                 conf->dot11MeshConfirmTimeout / 1000,
 722                                 (conf->dot11MeshConfirmTimeout % 1000) * 1000,
 723                                 plink_timer, wpa_s, sta);
 724                         break;
 725                 default:
 726                         break;
 727                 }
 728                 break;
 729         case PLINK_OPEN_RCVD:
 730                 switch (event) {
 731                 case OPN_RJCT:
 732                 case CNF_RJCT:
 733                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 734                         /* fall-through */
 735                 case CLS_ACPT:
 736                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 737                         if (!reason)
 738                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 739                         eloop_register_timeout(
 740                                 conf->dot11MeshHoldingTimeout / 1000,
 741                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 742                                 plink_timer, wpa_s, sta);
 743                         sta->mpm_close_reason = reason;
 744                         mesh_mpm_send_plink_action(wpa_s, sta,
 745                                                    PLINK_CLOSE, reason);
 746                         break;
 747                 case OPN_ACPT:
 748                         mesh_mpm_send_plink_action(wpa_s, sta,
 749                                                    PLINK_CONFIRM, 0);
 750                         break;
 751                 case CNF_ACPT:
 752                         if (conf->security & MESH_CONF_SEC_AMPE)
 753                                 mesh_rsn_derive_mtk(wpa_s, sta);
 754                         mesh_mpm_plink_estab(wpa_s, sta);
 755                         break;
 756                 default:
 757                         break;
 758                 }
 759                 break;
 760         case PLINK_CNF_RCVD:
 761                 switch (event) {
 762                 case OPN_RJCT:
 763                 case CNF_RJCT:
 764                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 765                         /* fall-through */
 766                 case CLS_ACPT:
 767                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 768                         if (!reason)
 769                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 770                         eloop_register_timeout(
 771                                 conf->dot11MeshHoldingTimeout / 1000,
 772                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 773                                 plink_timer, wpa_s, sta);
 774                         sta->mpm_close_reason = reason;
 775                         mesh_mpm_send_plink_action(wpa_s, sta,
 776                                                    PLINK_CLOSE, reason);
 777                         break;
 778                 case OPN_ACPT:
 779                         mesh_mpm_plink_estab(wpa_s, sta);
 780                         mesh_mpm_send_plink_action(wpa_s, sta,
 781                                                    PLINK_CONFIRM, 0);
 782                         break;
 783                 default:
 784                         break;
 785                 }
 786                 break;
 787         case PLINK_ESTAB:
 788                 switch (event) {
 789                 case CLS_ACPT:
 790                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 791                         reason = WLAN_REASON_MESH_CLOSE_RCVD;
 792
 793                         eloop_register_timeout(
 794                                 conf->dot11MeshHoldingTimeout / 1000,
 795                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 796                                 plink_timer, wpa_s, sta);
 797                         sta->mpm_close_reason = reason;
 798
 799                         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR
 800                                 " closed with reason %d",
 801                                 MAC2STR(sta->addr), reason);
 802
 803                         wpa_msg_ctrl(wpa_s, MSG_INFO,
 804                                      MESH_PEER_DISCONNECTED MACSTR,
 805                                      MAC2STR(sta->addr));
 806
 807                         hapd->num_plinks--;
 808
 809                         mesh_mpm_send_plink_action(wpa_s, sta,
 810                                                    PLINK_CLOSE, reason);
 811                         break;
 812                 case OPN_ACPT:
 813                         mesh_mpm_send_plink_action(wpa_s, sta,
 814                                                    PLINK_CONFIRM, 0);
 815                         break;
 816                 default:
 817                         break;
 818                 }
 819                 break;
 820         case PLINK_HOLDING:
 821                 switch (event) {
 822                 case CLS_ACPT:
 823                         mesh_mpm_fsm_restart(wpa_s, sta);
 824                         break;
 825                 case OPN_ACPT:
 826                 case CNF_ACPT:
 827                 case OPN_RJCT:
 828                 case CNF_RJCT:
 829                         reason = sta->mpm_close_reason;
 830                         mesh_mpm_send_plink_action(wpa_s, sta,
 831                                                    PLINK_CLOSE, reason);
 832                         break;
 833                 default:
 834                         break;
 835                 }
 836                 break;
 837         default:
 838                 wpa_msg(wpa_s, MSG_DEBUG,
 839                         "Unsupported MPM event %s for state %s",
 840                         mplevent[event], mplstate[sta->plink_state]);
 841                 break;
 842         }
 843 }
 844
 845
 846 void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
 847                         const struct ieee80211_mgmt *mgmt, size_t len)
 848 {
 849         u8 action_field;
 850         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 851         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
 852         struct sta_info *sta;
 853         u16 plid = 0, llid = 0;
 854         enum plink_event event;
 855         struct ieee802_11_elems elems;
 856         struct mesh_peer_mgmt_ie peer_mgmt_ie;
 857         const u8 *ies;
 858         size_t ie_len;
 859         int ret;
 860
 861         if (mgmt->u.action.category != WLAN_ACTION_SELF_PROTECTED)
 862                 return;
 863
 864         action_field = mgmt->u.action.u.slf_prot_action.action;
 865         if (action_field != PLINK_OPEN &&
 866             action_field != PLINK_CONFIRM &&
 867             action_field != PLINK_CLOSE)
 868                 return;
 869
 870         ies = mgmt->u.action.u.slf_prot_action.variable;
 871         ie_len = (const u8 *) mgmt + len -
 872                 mgmt->u.action.u.slf_prot_action.variable;
 873
 874         /* at least expect mesh id and peering mgmt */
 875         if (ie_len < 2 + 2) {
 876                 wpa_printf(MSG_DEBUG,
 877                            "MPM: Ignore too short action frame %u ie_len %u",
 878                            action_field, (unsigned int) ie_len);
 879                 return;
 880         }
 881         wpa_printf(MSG_DEBUG, "MPM: Received PLINK action %u", action_field);
 882
 883         if (action_field == PLINK_OPEN || action_field == PLINK_CONFIRM) {
 884                 wpa_printf(MSG_DEBUG, "MPM: Capability 0x%x",
 885                            WPA_GET_LE16(ies));
 886                 ies += 2;       /* capability */
 887                 ie_len -= 2;
 888         }
 889         if (action_field == PLINK_CONFIRM) {
 890                 wpa_printf(MSG_DEBUG, "MPM: AID 0x%x", WPA_GET_LE16(ies));
 891                 ies += 2;       /* aid */
 892                 ie_len -= 2;
 893         }
 894
 895         /* check for mesh peering, mesh id and mesh config IEs */
 896         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
 897                 wpa_printf(MSG_DEBUG, "MPM: Failed to parse PLINK IEs");
 898                 return;
 899         }
 900         if (!elems.peer_mgmt) {
 901                 wpa_printf(MSG_DEBUG,
 902                            "MPM: No Mesh Peering Management element");
 903                 return;
 904         }
 905         if (action_field != PLINK_CLOSE) {
 906                 if (!elems.mesh_id || !elems.mesh_config) {
 907                         wpa_printf(MSG_DEBUG,
 908                                    "MPM: No Mesh ID or Mesh Configuration element");
 909                         return;
 910                 }
 911
 912                 if (!matches_local(wpa_s, &elems)) {
 913                         wpa_printf(MSG_DEBUG,
 914                                    "MPM: Mesh ID or Mesh Configuration element do not match local MBSS");
 915                         return;
 916                 }
 917         }
 918
 919         ret = mesh_mpm_parse_peer_mgmt(wpa_s, action_field,
 920                                        elems.peer_mgmt,
 921                                        elems.peer_mgmt_len,
 922                                        &peer_mgmt_ie);
 923         if (ret) {
 924                 wpa_printf(MSG_DEBUG, "MPM: Mesh parsing rejected frame");
 925                 return;
 926         }
 927
 928         /* the sender's llid is our plid and vice-versa */
 929         plid = WPA_GET_LE16(peer_mgmt_ie.llid);
 930         if (peer_mgmt_ie.plid)
 931                 llid = WPA_GET_LE16(peer_mgmt_ie.plid);
 932         wpa_printf(MSG_DEBUG, "MPM: plid=0x%x llid=0x%x", plid, llid);
 933
 934         sta = ap_get_sta(hapd, mgmt->sa);
 935         if (!sta) {
 936                 wpa_printf(MSG_DEBUG, "MPM: No STA entry for peer");
 937                 return;
 938         }
 939
 940 #ifdef CONFIG_SAE
 941         /* peer is in sae_accepted? */
 942         if (sta->sae && sta->sae->state != SAE_ACCEPTED) {
 943                 wpa_printf(MSG_DEBUG, "MPM: SAE not yet accepted for peer");
 944                 return;
 945         }
 946 #endif /* CONFIG_SAE */
 947
 948         if (!sta->my_lid)
 949                 mesh_mpm_init_link(wpa_s, sta);
 950
 951         if ((mconf->security & MESH_CONF_SEC_AMPE) &&
 952             mesh_rsn_process_ampe(wpa_s, sta, &elems,
 953                                   &mgmt->u.action.category,
 954                                   ies, ie_len)) {
 955                 wpa_printf(MSG_DEBUG, "MPM: RSN process rejected frame");
 956                 return;
 957         }
 958
 959         if (sta->plink_state == PLINK_BLOCKED) {
 960                 wpa_printf(MSG_DEBUG, "MPM: PLINK_BLOCKED");
 961                 return;
 962         }
 963
 964         /* Now we will figure out the appropriate event... */
 965         switch (action_field) {
 966         case PLINK_OPEN:
 967                 if (plink_free_count(hapd) == 0) {
 968                         event = OPN_IGNR;
 969                         wpa_printf(MSG_INFO,
 970                                    "MPM: Peer link num over quota(%d)",
 971                                    hapd->max_plinks);
 972                 } else if (sta->peer_lid && sta->peer_lid != plid) {
 973                         event = OPN_IGNR;
 974                 } else {
 975                         sta->peer_lid = plid;
 976                         event = OPN_ACPT;
 977                 }
 978                 break;
 979         case PLINK_CONFIRM:
 980                 if (plink_free_count(hapd) == 0) {
 981                         event = CNF_IGNR;
 982                         wpa_printf(MSG_INFO,
 983                                    "MPM: Peer link num over quota(%d)",
 984                                    hapd->max_plinks);
 985                 } else if (sta->my_lid != llid ||
 986                            (sta->peer_lid && sta->peer_lid != plid)) {
 987                         event = CNF_IGNR;
 988                 } else {
 989                         if (!sta->peer_lid)
 990                                 sta->peer_lid = plid;
 991                         event = CNF_ACPT;
 992                 }
 993                 break;
 994         case PLINK_CLOSE:
 995                 if (sta->plink_state == PLINK_ESTAB)
 996                         /* Do not check for llid or plid. This does not
 997                          * follow the standard but since multiple plinks
 998                          * per cand are not supported, it is necessary in
 999                          * order to avoid a livelock when MP A sees an
1000                          * establish peer link to MP B but MP B does not
1001                          * see it. This can be caused by a timeout in
1002                          * B's peer link establishment or B being
1003                          * restarted.
1004                          */
1005                         event = CLS_ACPT;
1006                 else if (sta->peer_lid != plid)
1007                         event = CLS_IGNR;
1008                 else if (peer_mgmt_ie.plid && sta->my_lid != llid)
1009                         event = CLS_IGNR;
1010                 else
1011                         event = CLS_ACPT;
1012                 break;
1013         default:
1014                 /*
1015                  * This cannot be hit due to the action_field check above, but
1016                  * compilers may not be able to figure that out and can warn
1017                  * about uninitialized event below.
1018                  */
1019                 return;
1020         }
1021         mesh_mpm_fsm(wpa_s, sta, event);
1022 }
1023
1024
1025 /* called by ap_free_sta */
1026 void mesh_mpm_free_sta(struct sta_info *sta)
1027 {
1028         eloop_cancel_timeout(plink_timer, ELOOP_ALL_CTX, sta);
1029         eloop_cancel_timeout(mesh_auth_timer, ELOOP_ALL_CTX, sta);
1030 }