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