wpa_supplicant/ibss_rsn.c

   1 /*
   2  * wpa_supplicant - IBSS RSN
   3  * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "l2_packet/l2_packet.h"
  13 #include "rsn_supp/wpa.h"
  14 #include "rsn_supp/wpa_ie.h"
  15 #include "ap/wpa_auth.h"
  16 #include "wpa_supplicant_i.h"
  17 #include "driver_i.h"
  18 #include "common/ieee802_11_defs.h"
  19 #include "ibss_rsn.h"
  20
  21
  22 static struct ibss_rsn_peer * ibss_rsn_get_peer(struct ibss_rsn *ibss_rsn,
  23                                                 const u8 *addr)
  24 {
  25         struct ibss_rsn_peer *peer;
  26
  27         for (peer = ibss_rsn->peers; peer; peer = peer->next)
  28                 if (os_memcmp(addr, peer->addr, ETH_ALEN) == 0)
  29                         break;
  30         return peer;
  31 }
  32
  33
  34 static void ibss_rsn_free(struct ibss_rsn_peer *peer)
  35 {
  36         wpa_auth_sta_deinit(peer->auth);
  37         wpa_sm_deinit(peer->supp);
  38         os_free(peer);
  39 }
  40
  41
  42 static void supp_set_state(void *ctx, enum wpa_states state)
  43 {
  44         struct ibss_rsn_peer *peer = ctx;
  45         peer->supp_state = state;
  46 }
  47
  48
  49 static enum wpa_states supp_get_state(void *ctx)
  50 {
  51         struct ibss_rsn_peer *peer = ctx;
  52         return peer->supp_state;
  53 }
  54
  55
  56 static int supp_ether_send(void *ctx, const u8 *dest, u16 proto, const u8 *buf,
  57                            size_t len)
  58 {
  59         struct ibss_rsn_peer *peer = ctx;
  60         struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
  61
  62         wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR " proto=0x%04x "
  63                    "len=%lu)",
  64                    __func__, MAC2STR(dest), proto, (unsigned long) len);
  65
  66         if (wpa_s->l2)
  67                 return l2_packet_send(wpa_s->l2, dest, proto, buf, len);
  68
  69         return wpa_drv_send_eapol(wpa_s, dest, proto, buf, len);
  70 }
  71
  72
  73 static u8 * supp_alloc_eapol(void *ctx, u8 type, const void *data,
  74                              u16 data_len, size_t *msg_len, void **data_pos)
  75 {
  76         struct ieee802_1x_hdr *hdr;
  77
  78         wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)",
  79                    __func__, type, data_len);
  80
  81         *msg_len = sizeof(*hdr) + data_len;
  82         hdr = os_malloc(*msg_len);
  83         if (hdr == NULL)
  84                 return NULL;
  85
  86         hdr->version = 2;
  87         hdr->type = type;
  88         hdr->length = host_to_be16(data_len);
  89
  90         if (data)
  91                 os_memcpy(hdr + 1, data, data_len);
  92         else
  93                 os_memset(hdr + 1, 0, data_len);
  94
  95         if (data_pos)
  96                 *data_pos = hdr + 1;
  97
  98         return (u8 *) hdr;
  99 }
 100
 101
 102 static int supp_get_beacon_ie(void *ctx)
 103 {
 104         struct ibss_rsn_peer *peer = ctx;
 105
 106         wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
 107         /* TODO: get correct RSN IE */
 108         return wpa_sm_set_ap_rsn_ie(peer->supp,
 109                                     (u8 *) "\x30\x14\x01\x00"
 110                                     "\x00\x0f\xac\x04"
 111                                     "\x01\x00\x00\x0f\xac\x04"
 112                                     "\x01\x00\x00\x0f\xac\x02"
 113                                     "\x00\x00", 22);
 114 }
 115
 116
 117 static int supp_set_key(void *ctx, enum wpa_alg alg,
 118                         const u8 *addr, int key_idx, int set_tx,
 119                         const u8 *seq, size_t seq_len,
 120                         const u8 *key, size_t key_len)
 121 {
 122         struct ibss_rsn_peer *peer = ctx;
 123
 124         wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d "
 125                    "set_tx=%d)",
 126                    __func__, alg, MAC2STR(addr), key_idx, set_tx);
 127         wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len);
 128         wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len);
 129
 130         if (key_idx == 0) {
 131                 /*
 132                  * In IBSS RSN, the pairwise key from the 4-way handshake
 133                  * initiated by the peer with highest MAC address is used.
 134                  */
 135                 if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr,
 136                               ETH_ALEN) > 0) {
 137                         wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK");
 138                         return 0;
 139                 }
 140         }
 141
 142         if (is_broadcast_ether_addr(addr))
 143                 addr = peer->addr;
 144         return wpa_drv_set_key(peer->ibss_rsn->wpa_s, alg, addr, key_idx,
 145                                set_tx, seq, seq_len, key, key_len);
 146 }
 147
 148
 149 static void * supp_get_network_ctx(void *ctx)
 150 {
 151         struct ibss_rsn_peer *peer = ctx;
 152         return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s);
 153 }
 154
 155
 156 static int supp_mlme_setprotection(void *ctx, const u8 *addr,
 157                                    int protection_type, int key_type)
 158 {
 159         wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
 160                    "key_type=%d)",
 161                    __func__, MAC2STR(addr), protection_type, key_type);
 162         return 0;
 163 }
 164
 165
 166 static void supp_cancel_auth_timeout(void *ctx)
 167 {
 168         wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
 169 }
 170
 171
 172 static void supp_deauthenticate(void * ctx, int reason_code)
 173 {
 174         wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
 175 }
 176
 177
 178 static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
 179                               const u8 *psk)
 180 {
 181         struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
 182         if (ctx == NULL)
 183                 return -1;
 184
 185         ctx->ctx = peer;
 186         ctx->msg_ctx = peer->ibss_rsn->wpa_s;
 187         ctx->set_state = supp_set_state;
 188         ctx->get_state = supp_get_state;
 189         ctx->ether_send = supp_ether_send;
 190         ctx->get_beacon_ie = supp_get_beacon_ie;
 191         ctx->alloc_eapol = supp_alloc_eapol;
 192         ctx->set_key = supp_set_key;
 193         ctx->get_network_ctx = supp_get_network_ctx;
 194         ctx->mlme_setprotection = supp_mlme_setprotection;
 195         ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
 196         ctx->deauthenticate = supp_deauthenticate;
 197         peer->supp = wpa_sm_init(ctx);
 198         if (peer->supp == NULL) {
 199                 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
 200                 return -1;
 201         }
 202
 203         wpa_sm_set_own_addr(peer->supp, own_addr);
 204         wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
 205         wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
 206         wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
 207         wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
 208         wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
 209         wpa_sm_set_pmk(peer->supp, psk, PMK_LEN);
 210
 211         peer->supp_ie_len = sizeof(peer->supp_ie);
 212         if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
 213                                             &peer->supp_ie_len) < 0) {
 214                 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
 215                            " failed");
 216                 return -1;
 217         }
 218
 219         wpa_sm_notify_assoc(peer->supp, peer->addr);
 220
 221         return 0;
 222 }
 223
 224
 225 static void auth_logger(void *ctx, const u8 *addr, logger_level level,
 226                         const char *txt)
 227 {
 228         if (addr)
 229                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
 230                            MAC2STR(addr), txt);
 231         else
 232                 wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
 233 }
 234
 235
 236 static const u8 * auth_get_psk(void *ctx, const u8 *addr, const u8 *prev_psk)
 237 {
 238         struct ibss_rsn *ibss_rsn = ctx;
 239         wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
 240                    __func__, MAC2STR(addr), prev_psk);
 241         if (prev_psk)
 242                 return NULL;
 243         return ibss_rsn->psk;
 244 }
 245
 246
 247 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
 248                            size_t data_len, int encrypt)
 249 {
 250         struct ibss_rsn *ibss_rsn = ctx;
 251         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 252
 253         wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
 254                    "encrypt=%d)",
 255                    __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
 256
 257         if (wpa_s->l2)
 258                 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
 259                                       data_len);
 260
 261         return wpa_drv_send_eapol(wpa_s, addr, ETH_P_EAPOL, data, data_len);
 262 }
 263
 264
 265 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
 266                         const u8 *addr, int idx, u8 *key, size_t key_len)
 267 {
 268         struct ibss_rsn *ibss_rsn = ctx;
 269         u8 seq[6];
 270
 271         os_memset(seq, 0, sizeof(seq));
 272
 273         if (addr) {
 274                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
 275                            " key_idx=%d)",
 276                            __func__, alg, MAC2STR(addr), idx);
 277         } else {
 278                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
 279                            __func__, alg, idx);
 280         }
 281         wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
 282
 283         if (idx == 0) {
 284                 /*
 285                  * In IBSS RSN, the pairwise key from the 4-way handshake
 286                  * initiated by the peer with highest MAC address is used.
 287                  */
 288                 if (addr == NULL ||
 289                     os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
 290                         wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
 291                         return 0;
 292                 }
 293         }
 294
 295         return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
 296                                1, seq, 6, key, key_len);
 297 }
 298
 299
 300 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
 301 {
 302         struct ibss_rsn *ibss_rsn = ctx;
 303         wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
 304 }
 305
 306
 307 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
 308                                                   void *ctx),
 309                              void *cb_ctx)
 310 {
 311         struct ibss_rsn *ibss_rsn = ctx;
 312         struct ibss_rsn_peer *peer;
 313
 314         wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
 315
 316         for (peer = ibss_rsn->peers; peer; peer = peer->next) {
 317                 if (peer->auth && cb(peer->auth, cb_ctx))
 318                         return 1;
 319         }
 320
 321         return 0;
 322 }
 323
 324
 325 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
 326                                     struct ibss_rsn_peer *peer, int authorized)
 327 {
 328         int res;
 329
 330         if (authorized) {
 331                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 332                                             WPA_STA_AUTHORIZED,
 333                                             WPA_STA_AUTHORIZED, ~0);
 334                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
 335                            MAC2STR(peer->addr));
 336         } else {
 337                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 338                                             0, 0, ~WPA_STA_AUTHORIZED);
 339                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
 340                            MAC2STR(peer->addr));
 341         }
 342
 343         if (res && errno != ENOENT) {
 344                 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
 345                            "for kernel driver (errno=%d)",
 346                            MAC2STR(peer->addr), errno);
 347         }
 348 }
 349
 350
 351 static void auth_set_eapol(void *ctx, const u8 *addr,
 352                                        wpa_eapol_variable var, int value)
 353 {
 354         struct ibss_rsn *ibss_rsn = ctx;
 355         struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
 356
 357         if (peer == NULL)
 358                 return;
 359
 360         switch (var) {
 361         case WPA_EAPOL_authorized:
 362                 ibss_set_sta_authorized(ibss_rsn, peer, value);
 363                 break;
 364         default:
 365                 /* do not handle any other event */
 366                 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
 367                 break;
 368         }
 369 }
 370
 371
 372 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
 373                                     const u8 *own_addr)
 374 {
 375         struct wpa_auth_config conf;
 376         struct wpa_auth_callbacks cb;
 377
 378         wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
 379
 380         os_memset(&conf, 0, sizeof(conf));
 381         conf.wpa = 2;
 382         conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
 383         conf.wpa_pairwise = WPA_CIPHER_CCMP;
 384         conf.rsn_pairwise = WPA_CIPHER_CCMP;
 385         conf.wpa_group = WPA_CIPHER_CCMP;
 386         conf.eapol_version = 2;
 387         conf.wpa_group_rekey = 600;
 388
 389         os_memset(&cb, 0, sizeof(cb));
 390         cb.ctx = ibss_rsn;
 391         cb.logger = auth_logger;
 392         cb.set_eapol = auth_set_eapol;
 393         cb.send_eapol = auth_send_eapol;
 394         cb.get_psk = auth_get_psk;
 395         cb.set_key = auth_set_key;
 396         cb.for_each_sta = auth_for_each_sta;
 397         cb.disconnect = ibss_rsn_disconnect;
 398
 399         ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb);
 400         if (ibss_rsn->auth_group == NULL) {
 401                 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
 402                 return -1;
 403         }
 404
 405         wpa_init_keys(ibss_rsn->auth_group);
 406
 407         return 0;
 408 }
 409
 410
 411 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
 412                               struct ibss_rsn_peer *peer)
 413 {
 414         peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr);
 415         if (peer->auth == NULL) {
 416                 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
 417                 return -1;
 418         }
 419
 420         /* TODO: get peer RSN IE with Probe Request */
 421         if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth,
 422                                 (u8 *) "\x30\x14\x01\x00"
 423                                 "\x00\x0f\xac\x04"
 424                                 "\x01\x00\x00\x0f\xac\x04"
 425                                 "\x01\x00\x00\x0f\xac\x02"
 426                                 "\x00\x00", 22, NULL, 0) !=
 427             WPA_IE_OK) {
 428                 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
 429                 return -1;
 430         }
 431
 432         if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
 433                 return -1;
 434
 435         if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
 436                 return -1;
 437
 438         return 0;
 439 }
 440
 441
 442 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
 443 {
 444         struct ieee80211_mgmt auth;
 445         const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
 446         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 447
 448         if (wpa_s->driver->send_frame == NULL)
 449                 return -1;
 450
 451         os_memset(&auth, 0, sizeof(auth));
 452
 453         auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 454                                           WLAN_FC_STYPE_AUTH);
 455         os_memcpy(auth.da, da, ETH_ALEN);
 456         os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
 457         os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
 458
 459         auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
 460         auth.u.auth.auth_transaction = host_to_le16(seq);
 461         auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
 462
 463         wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
 464                    seq, MAC2STR(da));
 465
 466         return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth,
 467                                          auth_length, 0);
 468 }
 469
 470
 471 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
 472 {
 473         return peer->authentication_status &
 474                (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
 475 }
 476
 477
 478 static struct ibss_rsn_peer *
 479 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
 480 {
 481         struct ibss_rsn_peer *peer;
 482         if (ibss_rsn == NULL)
 483                 return NULL;
 484
 485         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 486         if (peer) {
 487                 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
 488                            " already running", MAC2STR(addr));
 489                 return peer;
 490         }
 491
 492         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
 493                    MAC2STR(addr));
 494
 495         peer = os_zalloc(sizeof(*peer));
 496         if (peer == NULL) {
 497                 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
 498                 return NULL;
 499         }
 500
 501         peer->ibss_rsn = ibss_rsn;
 502         os_memcpy(peer->addr, addr, ETH_ALEN);
 503         peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
 504
 505         if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
 506                                ibss_rsn->psk) < 0) {
 507                 ibss_rsn_free(peer);
 508                 return NULL;
 509         }
 510
 511         peer->next = ibss_rsn->peers;
 512         ibss_rsn->peers = peer;
 513
 514         return peer;
 515 }
 516
 517
 518 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
 519 {
 520         struct ibss_rsn_peer *peer;
 521         int res;
 522
 523         /* if the peer already exists, exit immediately */
 524         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 525         if (peer)
 526                 return 0;
 527
 528         peer = ibss_rsn_peer_init(ibss_rsn, addr);
 529         if (peer == NULL)
 530                 return -1;
 531
 532         /* Open Authentication: send first Authentication frame */
 533         res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
 534         if (res) {
 535                 /*
 536                  * The driver may not support Authentication frame exchange in
 537                  * IBSS. Ignore authentication and go through EAPOL exchange.
 538                  */
 539                 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
 540                 return ibss_rsn_auth_init(ibss_rsn, peer);
 541         }
 542
 543         return 0;
 544 }
 545
 546
 547 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
 548                                        struct ibss_rsn_peer *peer, int reason)
 549 {
 550         int already_started;
 551
 552         if (ibss_rsn == NULL || peer == NULL)
 553                 return -1;
 554
 555         already_started = ibss_rsn_is_auth_started(peer);
 556         peer->authentication_status |= reason;
 557
 558         if (already_started) {
 559                 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
 560                            "started for peer " MACSTR, MAC2STR(peer->addr));
 561                 return 0;
 562         }
 563
 564         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
 565                    "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
 566
 567         return ibss_rsn_auth_init(ibss_rsn, peer);
 568 }
 569
 570
 571 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
 572 {
 573         struct ibss_rsn_peer *peer, *prev;
 574
 575         if (ibss_rsn == NULL)
 576                 return;
 577
 578         if (peermac == NULL) {
 579                 /* remove all peers */
 580                 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
 581                 peer = ibss_rsn->peers;
 582                 while (peer) {
 583                         prev = peer;
 584                         peer = peer->next;
 585                         ibss_rsn_free(prev);
 586                         ibss_rsn->peers = peer;
 587                 }
 588         } else {
 589                 /* remove specific peer */
 590                 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
 591                            __func__, MAC2STR(peermac));
 592
 593                 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
 594                      prev = peer, peer = peer->next) {
 595                         if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
 596                                 if (prev == NULL)
 597                                         ibss_rsn->peers = peer->next;
 598                                 else
 599                                         prev->next = peer->next;
 600                                 ibss_rsn_free(peer);
 601                                 wpa_printf(MSG_DEBUG, "%s: Successfully "
 602                                            "removed a specific peer",
 603                                            __func__);
 604                                 break;
 605                         }
 606                 }
 607         }
 608 }
 609
 610
 611 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s)
 612 {
 613         struct ibss_rsn *ibss_rsn;
 614
 615         ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
 616         if (ibss_rsn == NULL)
 617                 return NULL;
 618         ibss_rsn->wpa_s = wpa_s;
 619
 620         if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr) < 0) {
 621                 ibss_rsn_deinit(ibss_rsn);
 622                 return NULL;
 623         }
 624
 625         return ibss_rsn;
 626 }
 627
 628
 629 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
 630 {
 631         struct ibss_rsn_peer *peer, *prev;
 632
 633         if (ibss_rsn == NULL)
 634                 return;
 635
 636         peer = ibss_rsn->peers;
 637         while (peer) {
 638                 prev = peer;
 639                 peer = peer->next;
 640                 ibss_rsn_free(prev);
 641         }
 642
 643         wpa_deinit(ibss_rsn->auth_group);
 644         os_free(ibss_rsn);
 645
 646 }
 647
 648
 649 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
 650 {
 651         const struct ieee802_1x_hdr *hdr;
 652         const struct wpa_eapol_key *key;
 653         u16 key_info;
 654         size_t plen;
 655
 656         /* TODO: Support other EAPOL packets than just EAPOL-Key */
 657
 658         if (len < sizeof(*hdr) + sizeof(*key))
 659                 return -1;
 660
 661         hdr = (const struct ieee802_1x_hdr *) buf;
 662         key = (const struct wpa_eapol_key *) (hdr + 1);
 663         plen = be_to_host16(hdr->length);
 664
 665         if (hdr->version < EAPOL_VERSION) {
 666                 /* TODO: backwards compatibility */
 667         }
 668         if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
 669                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
 670                         "not a Key frame", hdr->type);
 671                 return -1;
 672         }
 673         if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
 674                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
 675                            "invalid (frame size %lu)",
 676                            (unsigned long) plen, (unsigned long) len);
 677                 return -1;
 678         }
 679
 680         if (key->type != EAPOL_KEY_TYPE_RSN) {
 681                 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
 682                            "discarded", key->type);
 683                 return -1;
 684         }
 685
 686         key_info = WPA_GET_BE16(key->key_info);
 687
 688         return !!(key_info & WPA_KEY_INFO_ACK);
 689 }
 690
 691
 692 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
 693                                      struct ibss_rsn_peer *peer,
 694                                      const u8 *buf, size_t len)
 695 {
 696         int supp;
 697         u8 *tmp;
 698
 699         supp = ibss_rsn_eapol_dst_supp(buf, len);
 700         if (supp < 0)
 701                 return -1;
 702
 703         tmp = os_malloc(len);
 704         if (tmp == NULL)
 705                 return -1;
 706         os_memcpy(tmp, buf, len);
 707         if (supp) {
 708                 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
 709                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
 710                            MACSTR, MAC2STR(peer->addr));
 711                 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
 712         } else {
 713                 if (ibss_rsn_is_auth_started(peer) == 0) {
 714                         wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
 715                                    "Authenticator dropped as " MACSTR " is not "
 716                                    "authenticated", MAC2STR(peer->addr));
 717                         os_free(tmp);
 718                         return -1;
 719                 }
 720
 721                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
 722                            "from "MACSTR, MAC2STR(peer->addr));
 723                 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
 724         }
 725         os_free(tmp);
 726
 727         return 1;
 728 }
 729
 730
 731 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
 732                       const u8 *buf, size_t len)
 733 {
 734         struct ibss_rsn_peer *peer;
 735
 736         if (ibss_rsn == NULL)
 737                 return -1;
 738
 739         peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
 740         if (peer)
 741                 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
 742
 743         if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
 744                 /*
 745                  * Create new IBSS peer based on an EAPOL message from the peer
 746                  * Authenticator.
 747                  */
 748                 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
 749                 if (peer == NULL)
 750                         return -1;
 751
 752                 /* assume the peer is authenticated already */
 753                 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
 754                            MACSTR, MAC2STR(src_addr));
 755                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 756                                             IBSS_RSN_AUTH_EAPOL_BY_US);
 757
 758                 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
 759                                                  buf, len);
 760         }
 761
 762         return 0;
 763 }
 764
 765 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
 766 {
 767         if (ibss_rsn == NULL)
 768                 return;
 769         os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
 770 }
 771
 772
 773 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
 774                                         struct ibss_rsn_peer *peer,
 775                                         const u8* addr)
 776 {
 777         wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
 778                    MAC2STR(addr));
 779
 780         if (peer &&
 781             peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
 782                 /*
 783                  * A peer sent us an Authentication frame even though it already
 784                  * started an EAPOL session. We should reinit state machines
 785                  * here, but it's much more complicated than just deleting and
 786                  * recreating the state machine
 787                  */
 788                 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
 789                            MACSTR, MAC2STR(addr));
 790
 791                 ibss_rsn_stop(ibss_rsn, addr);
 792                 peer = NULL;
 793         }
 794
 795         if (!peer) {
 796                 peer = ibss_rsn_peer_init(ibss_rsn, addr);
 797                 if (!peer)
 798                         return;
 799
 800                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
 801                            MAC2STR(addr));
 802         }
 803
 804         /* reply with an Authentication frame now, before sending an EAPOL */
 805         ibss_rsn_send_auth(ibss_rsn, addr, 2);
 806         /* no need to start another AUTH challenge in the other way.. */
 807         ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
 808 }
 809
 810
 811 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
 812                           size_t len)
 813 {
 814         const struct ieee80211_mgmt *header;
 815         struct ibss_rsn_peer *peer;
 816         size_t auth_length;
 817
 818         header = (const struct ieee80211_mgmt *) auth_frame;
 819         auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
 820
 821         if (ibss_rsn == NULL || len < auth_length)
 822                 return;
 823
 824         if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
 825             le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
 826                 return;
 827
 828         peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
 829
 830         switch (le_to_host16(header->u.auth.auth_transaction)) {
 831         case 1:
 832                 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
 833                 break;
 834         case 2:
 835                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
 836                            MACSTR, MAC2STR(header->sa));
 837                 if (!peer) {
 838                         wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
 839                                    "unknown STA " MACSTR, MAC2STR(header->sa));
 840                         break;
 841                 }
 842
 843                 /* authentication has been completed */
 844                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with "MACSTR,
 845                            MAC2STR(header->sa));
 846                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 847                                             IBSS_RSN_AUTH_BY_US);
 848                 break;
 849         }
 850 }