contrib/wpa/src/rsn_supp/tdls.c

   1 /*
   2  * wpa_supplicant - TDLS
   3  * Copyright (c) 2010-2011, Atheros Communications
   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 "utils/os.h"
  14 #include "common/ieee802_11_defs.h"
  15 #include "common/ieee802_11_common.h"
  16 #include "crypto/sha256.h"
  17 #include "crypto/crypto.h"
  18 #include "crypto/aes_wrap.h"
  19 #include "rsn_supp/wpa.h"
  20 #include "rsn_supp/wpa_ie.h"
  21 #include "rsn_supp/wpa_i.h"
  22 #include "drivers/driver.h"
  23 #include "l2_packet/l2_packet.h"
  24
  25 #ifdef CONFIG_TDLS_TESTING
  26 #define TDLS_TESTING_LONG_FRAME BIT(0)
  27 #define TDLS_TESTING_ALT_RSN_IE BIT(1)
  28 #define TDLS_TESTING_DIFF_BSSID BIT(2)
  29 #define TDLS_TESTING_SHORT_LIFETIME BIT(3)
  30 #define TDLS_TESTING_WRONG_LIFETIME_RESP BIT(4)
  31 #define TDLS_TESTING_WRONG_LIFETIME_CONF BIT(5)
  32 #define TDLS_TESTING_LONG_LIFETIME BIT(6)
  33 #define TDLS_TESTING_CONCURRENT_INIT BIT(7)
  34 #define TDLS_TESTING_NO_TPK_EXPIRATION BIT(8)
  35 #define TDLS_TESTING_DECLINE_RESP BIT(9)
  36 #define TDLS_TESTING_IGNORE_AP_PROHIBIT BIT(10)
  37 #define TDLS_TESTING_WRONG_MIC BIT(11)
  38 unsigned int tdls_testing = 0;
  39 #endif /* CONFIG_TDLS_TESTING */
  40
  41 #define TPK_LIFETIME 43200 /* 12 hours */
  42 #define TPK_M1_RETRY_COUNT 3
  43 #define TPK_M1_TIMEOUT 5000 /* in milliseconds */
  44 #define TPK_M2_RETRY_COUNT 10
  45 #define TPK_M2_TIMEOUT 500 /* in milliseconds */
  46
  47 #define TDLS_MIC_LEN            16
  48
  49 #define TDLS_TIMEOUT_LEN        4
  50
  51 struct wpa_tdls_ftie {
  52         u8 ie_type; /* FTIE */
  53         u8 ie_len;
  54         u8 mic_ctrl[2];
  55         u8 mic[TDLS_MIC_LEN];
  56         u8 Anonce[WPA_NONCE_LEN]; /* Responder Nonce in TDLS */
  57         u8 Snonce[WPA_NONCE_LEN]; /* Initiator Nonce in TDLS */
  58         /* followed by optional elements */
  59 } STRUCT_PACKED;
  60
  61 struct wpa_tdls_timeoutie {
  62         u8 ie_type; /* Timeout IE */
  63         u8 ie_len;
  64         u8 interval_type;
  65         u8 value[TDLS_TIMEOUT_LEN];
  66 } STRUCT_PACKED;
  67
  68 struct wpa_tdls_lnkid {
  69         u8 ie_type; /* Link Identifier IE */
  70         u8 ie_len;
  71         u8 bssid[ETH_ALEN];
  72         u8 init_sta[ETH_ALEN];
  73         u8 resp_sta[ETH_ALEN];
  74 } STRUCT_PACKED;
  75
  76 /* TDLS frame headers as per IEEE Std 802.11z-2010 */
  77 struct wpa_tdls_frame {
  78         u8 payloadtype; /* IEEE80211_TDLS_RFTYPE */
  79         u8 category; /* Category */
  80         u8 action; /* Action (enum tdls_frame_type) */
  81 } STRUCT_PACKED;
  82
  83 static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs);
  84 static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx);
  85 static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer);
  86 static void wpa_tdls_disable_peer_link(struct wpa_sm *sm,
  87                                        struct wpa_tdls_peer *peer);
  88 static int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr,
  89                                   u16 reason_code);
  90
  91
  92 #define TDLS_MAX_IE_LEN 80
  93 #define IEEE80211_MAX_SUPP_RATES 32
  94
  95 struct wpa_tdls_peer {
  96         struct wpa_tdls_peer *next;
  97         unsigned int reconfig_key:1;
  98         int initiator; /* whether this end was initiator for TDLS setup */
  99         u8 addr[ETH_ALEN]; /* other end MAC address */
 100         u8 inonce[WPA_NONCE_LEN]; /* Initiator Nonce */
 101         u8 rnonce[WPA_NONCE_LEN]; /* Responder Nonce */
 102         u8 rsnie_i[TDLS_MAX_IE_LEN]; /* Initiator RSN IE */
 103         size_t rsnie_i_len;
 104         u8 rsnie_p[TDLS_MAX_IE_LEN]; /* Peer RSN IE */
 105         size_t rsnie_p_len;
 106         u32 lifetime;
 107         int cipher; /* Selected cipher (WPA_CIPHER_*) */
 108         u8 dtoken;
 109
 110         struct tpk {
 111                 u8 kck[16]; /* TPK-KCK */
 112                 u8 tk[16]; /* TPK-TK; assuming only CCMP will be used */
 113         } tpk;
 114         int tpk_set;
 115         int tk_set; /* TPK-TK configured to the driver */
 116         int tpk_success;
 117         int tpk_in_progress;
 118
 119         struct tpk_timer {
 120                 u8 dest[ETH_ALEN];
 121                 int count;      /* Retry Count */
 122                 int timer;      /* Timeout in milliseconds */
 123                 u8 action_code; /* TDLS frame type */
 124                 u8 dialog_token;
 125                 u16 status_code;
 126                 u32 peer_capab;
 127                 int buf_len;    /* length of TPK message for retransmission */
 128                 u8 *buf;        /* buffer for TPK message */
 129         } sm_tmr;
 130
 131         u16 capability;
 132
 133         u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
 134         size_t supp_rates_len;
 135
 136         struct ieee80211_ht_capabilities *ht_capabilities;
 137         struct ieee80211_vht_capabilities *vht_capabilities;
 138
 139         u8 qos_info;
 140
 141         u16 aid;
 142
 143         u8 *ext_capab;
 144         size_t ext_capab_len;
 145
 146         u8 *supp_channels;
 147         size_t supp_channels_len;
 148
 149         u8 *supp_oper_classes;
 150         size_t supp_oper_classes_len;
 151
 152         u8 wmm_capable;
 153
 154         /* channel switch currently enabled */
 155         int chan_switch_enabled;
 156 };
 157
 158
 159 static int wpa_tdls_get_privacy(struct wpa_sm *sm)
 160 {
 161         /*
 162          * Get info needed from supplicant to check if the current BSS supports
 163          * security. Other than OPEN mode, rest are considered secured
 164          * WEP/WPA/WPA2 hence TDLS frames are processed for TPK handshake.
 165          */
 166         return sm->pairwise_cipher != WPA_CIPHER_NONE;
 167 }
 168
 169
 170 static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len)
 171 {
 172         os_memcpy(pos, ie, ie_len);
 173         return pos + ie_len;
 174 }
 175
 176
 177 static int wpa_tdls_del_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
 178 {
 179         if (wpa_sm_set_key(sm, WPA_ALG_NONE, peer->addr,
 180                            0, 0, NULL, 0, NULL, 0) < 0) {
 181                 wpa_printf(MSG_WARNING, "TDLS: Failed to delete TPK-TK from "
 182                            "the driver");
 183                 return -1;
 184         }
 185
 186         return 0;
 187 }
 188
 189
 190 static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
 191 {
 192         u8 key_len;
 193         u8 rsc[6];
 194         enum wpa_alg alg;
 195
 196         if (peer->tk_set) {
 197                 /*
 198                  * This same TPK-TK has already been configured to the driver
 199                  * and this new configuration attempt (likely due to an
 200                  * unexpected retransmitted frame) would result in clearing
 201                  * the TX/RX sequence number which can break security, so must
 202                  * not allow that to happen.
 203                  */
 204                 wpa_printf(MSG_INFO, "TDLS: TPK-TK for the peer " MACSTR
 205                            " has already been configured to the driver - do not reconfigure",
 206                            MAC2STR(peer->addr));
 207                 return -1;
 208         }
 209
 210         os_memset(rsc, 0, 6);
 211
 212         switch (peer->cipher) {
 213         case WPA_CIPHER_CCMP:
 214                 alg = WPA_ALG_CCMP;
 215                 key_len = 16;
 216                 break;
 217         case WPA_CIPHER_NONE:
 218                 wpa_printf(MSG_DEBUG, "TDLS: Pairwise Cipher Suite: "
 219                            "NONE - do not use pairwise keys");
 220                 return -1;
 221         default:
 222                 wpa_printf(MSG_WARNING, "TDLS: Unsupported pairwise cipher %d",
 223                            sm->pairwise_cipher);
 224                 return -1;
 225         }
 226
 227         wpa_printf(MSG_DEBUG, "TDLS: Configure pairwise key for peer " MACSTR,
 228                    MAC2STR(peer->addr));
 229         if (wpa_sm_set_key(sm, alg, peer->addr, -1, 1,
 230                            rsc, sizeof(rsc), peer->tpk.tk, key_len) < 0) {
 231                 wpa_printf(MSG_WARNING, "TDLS: Failed to set TPK to the "
 232                            "driver");
 233                 return -1;
 234         }
 235         peer->tk_set = 1;
 236         return 0;
 237 }
 238
 239
 240 static int wpa_tdls_send_tpk_msg(struct wpa_sm *sm, const u8 *dst,
 241                                  u8 action_code, u8 dialog_token,
 242                                  u16 status_code, u32 peer_capab,
 243                                  int initiator, const u8 *buf, size_t len)
 244 {
 245         return wpa_sm_send_tdls_mgmt(sm, dst, action_code, dialog_token,
 246                                      status_code, peer_capab, initiator, buf,
 247                                      len);
 248 }
 249
 250
 251 static int wpa_tdls_tpk_send(struct wpa_sm *sm, const u8 *dest, u8 action_code,
 252                              u8 dialog_token, u16 status_code, u32 peer_capab,
 253                              int initiator, const u8 *msg, size_t msg_len)
 254 {
 255         struct wpa_tdls_peer *peer;
 256
 257         wpa_printf(MSG_DEBUG, "TDLS: TPK send dest=" MACSTR " action_code=%u "
 258                    "dialog_token=%u status_code=%u peer_capab=%u initiator=%d "
 259                    "msg_len=%u",
 260                    MAC2STR(dest), action_code, dialog_token, status_code,
 261                    peer_capab, initiator, (unsigned int) msg_len);
 262
 263         if (wpa_tdls_send_tpk_msg(sm, dest, action_code, dialog_token,
 264                                   status_code, peer_capab, initiator, msg,
 265                                   msg_len)) {
 266                 wpa_printf(MSG_INFO, "TDLS: Failed to send message "
 267                            "(action_code=%u)", action_code);
 268                 return -1;
 269         }
 270
 271         if (action_code == WLAN_TDLS_SETUP_CONFIRM ||
 272             action_code == WLAN_TDLS_TEARDOWN ||
 273             action_code == WLAN_TDLS_DISCOVERY_REQUEST ||
 274             action_code == WLAN_TDLS_DISCOVERY_RESPONSE)
 275                 return 0; /* No retries */
 276
 277         for (peer = sm->tdls; peer; peer = peer->next) {
 278                 if (os_memcmp(peer->addr, dest, ETH_ALEN) == 0)
 279                         break;
 280         }
 281
 282         if (peer == NULL) {
 283                 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
 284                            "retry " MACSTR, MAC2STR(dest));
 285                 return 0;
 286         }
 287
 288         eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
 289
 290         if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
 291                 peer->sm_tmr.count = TPK_M2_RETRY_COUNT;
 292                 peer->sm_tmr.timer = TPK_M2_TIMEOUT;
 293         } else {
 294                 peer->sm_tmr.count = TPK_M1_RETRY_COUNT;
 295                 peer->sm_tmr.timer = TPK_M1_TIMEOUT;
 296         }
 297
 298         /* Copy message to resend on timeout */
 299         os_memcpy(peer->sm_tmr.dest, dest, ETH_ALEN);
 300         peer->sm_tmr.action_code = action_code;
 301         peer->sm_tmr.dialog_token = dialog_token;
 302         peer->sm_tmr.status_code = status_code;
 303         peer->sm_tmr.peer_capab = peer_capab;
 304         peer->sm_tmr.buf_len = msg_len;
 305         os_free(peer->sm_tmr.buf);
 306         peer->sm_tmr.buf = os_malloc(msg_len);
 307         if (peer->sm_tmr.buf == NULL)
 308                 return -1;
 309         os_memcpy(peer->sm_tmr.buf, msg, msg_len);
 310
 311         wpa_printf(MSG_DEBUG, "TDLS: Retry timeout registered "
 312                    "(action_code=%u)", action_code);
 313         eloop_register_timeout(peer->sm_tmr.timer / 1000,
 314                                (peer->sm_tmr.timer % 1000) * 1000,
 315                                wpa_tdls_tpk_retry_timeout, sm, peer);
 316         return 0;
 317 }
 318
 319
 320 static int wpa_tdls_do_teardown(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
 321                                 u16 reason_code)
 322 {
 323         int ret;
 324
 325         ret = wpa_tdls_send_teardown(sm, peer->addr, reason_code);
 326         /* disable the link after teardown was sent */
 327         wpa_tdls_disable_peer_link(sm, peer);
 328
 329         return ret;
 330 }
 331
 332
 333 static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx)
 334 {
 335
 336         struct wpa_sm *sm = eloop_ctx;
 337         struct wpa_tdls_peer *peer = timeout_ctx;
 338
 339         if (peer->sm_tmr.count) {
 340                 peer->sm_tmr.count--;
 341
 342                 wpa_printf(MSG_INFO, "TDLS: Retrying sending of message "
 343                            "(action_code=%u)",
 344                            peer->sm_tmr.action_code);
 345
 346                 if (peer->sm_tmr.buf == NULL) {
 347                         wpa_printf(MSG_INFO, "TDLS: No retry buffer available "
 348                                    "for action_code=%u",
 349                                    peer->sm_tmr.action_code);
 350                         eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm,
 351                                              peer);
 352                         return;
 353                 }
 354
 355                 /* resend TPK Handshake Message to Peer */
 356                 if (wpa_tdls_send_tpk_msg(sm, peer->sm_tmr.dest,
 357                                           peer->sm_tmr.action_code,
 358                                           peer->sm_tmr.dialog_token,
 359                                           peer->sm_tmr.status_code,
 360                                           peer->sm_tmr.peer_capab,
 361                                           peer->initiator,
 362                                           peer->sm_tmr.buf,
 363                                           peer->sm_tmr.buf_len)) {
 364                         wpa_printf(MSG_INFO, "TDLS: Failed to retry "
 365                                    "transmission");
 366                 }
 367
 368                 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
 369                 eloop_register_timeout(peer->sm_tmr.timer / 1000,
 370                                        (peer->sm_tmr.timer % 1000) * 1000,
 371                                        wpa_tdls_tpk_retry_timeout, sm, peer);
 372         } else {
 373                 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
 374
 375                 wpa_printf(MSG_DEBUG, "TDLS: Sending Teardown Request");
 376                 wpa_tdls_do_teardown(sm, peer,
 377                                      WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
 378         }
 379 }
 380
 381
 382 static void wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm *sm,
 383                                               struct wpa_tdls_peer *peer,
 384                                               u8 action_code)
 385 {
 386         if (action_code == peer->sm_tmr.action_code) {
 387                 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout cancelled for "
 388                            "action_code=%u", action_code);
 389
 390                 /* Cancel Timeout registered */
 391                 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
 392
 393                 /* free all resources meant for retry */
 394                 os_free(peer->sm_tmr.buf);
 395                 peer->sm_tmr.buf = NULL;
 396
 397                 peer->sm_tmr.count = 0;
 398                 peer->sm_tmr.timer = 0;
 399                 peer->sm_tmr.buf_len = 0;
 400                 peer->sm_tmr.action_code = 0xff;
 401         } else {
 402                 wpa_printf(MSG_INFO, "TDLS: Error in cancelling retry timeout "
 403                            "(Unknown action_code=%u)", action_code);
 404         }
 405 }
 406
 407
 408 static void wpa_tdls_generate_tpk(struct wpa_tdls_peer *peer,
 409                                   const u8 *own_addr, const u8 *bssid)
 410 {
 411         u8 key_input[SHA256_MAC_LEN];
 412         const u8 *nonce[2];
 413         size_t len[2];
 414         u8 data[3 * ETH_ALEN];
 415
 416         /* IEEE Std 802.11z-2010 8.5.9.1:
 417          * TPK-Key-Input = SHA-256(min(SNonce, ANonce) || max(SNonce, ANonce))
 418          */
 419         len[0] = WPA_NONCE_LEN;
 420         len[1] = WPA_NONCE_LEN;
 421         if (os_memcmp(peer->inonce, peer->rnonce, WPA_NONCE_LEN) < 0) {
 422                 nonce[0] = peer->inonce;
 423                 nonce[1] = peer->rnonce;
 424         } else {
 425                 nonce[0] = peer->rnonce;
 426                 nonce[1] = peer->inonce;
 427         }
 428         wpa_hexdump(MSG_DEBUG, "TDLS: min(Nonce)", nonce[0], WPA_NONCE_LEN);
 429         wpa_hexdump(MSG_DEBUG, "TDLS: max(Nonce)", nonce[1], WPA_NONCE_LEN);
 430         sha256_vector(2, nonce, len, key_input);
 431         wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-Key-Input",
 432                         key_input, SHA256_MAC_LEN);
 433
 434         /*
 435          * TPK-Key-Data = KDF-N_KEY(TPK-Key-Input, "TDLS PMK",
 436          *      min(MAC_I, MAC_R) || max(MAC_I, MAC_R) || BSSID || N_KEY)
 437          * TODO: is N_KEY really included in KDF Context and if so, in which
 438          * presentation format (little endian 16-bit?) is it used? It gets
 439          * added by the KDF anyway..
 440          */
 441
 442         if (os_memcmp(own_addr, peer->addr, ETH_ALEN) < 0) {
 443                 os_memcpy(data, own_addr, ETH_ALEN);
 444                 os_memcpy(data + ETH_ALEN, peer->addr, ETH_ALEN);
 445         } else {
 446                 os_memcpy(data, peer->addr, ETH_ALEN);
 447                 os_memcpy(data + ETH_ALEN, own_addr, ETH_ALEN);
 448         }
 449         os_memcpy(data + 2 * ETH_ALEN, bssid, ETH_ALEN);
 450         wpa_hexdump(MSG_DEBUG, "TDLS: KDF Context", data, sizeof(data));
 451
 452         sha256_prf(key_input, SHA256_MAC_LEN, "TDLS PMK", data, sizeof(data),
 453                    (u8 *) &peer->tpk, sizeof(peer->tpk));
 454         wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-KCK",
 455                         peer->tpk.kck, sizeof(peer->tpk.kck));
 456         wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-TK",
 457                         peer->tpk.tk, sizeof(peer->tpk.tk));
 458         peer->tpk_set = 1;
 459 }
 460
 461
 462 /**
 463  * wpa_tdls_ftie_mic - Calculate TDLS FTIE MIC
 464  * @kck: TPK-KCK
 465  * @lnkid: Pointer to the beginning of Link Identifier IE
 466  * @rsnie: Pointer to the beginning of RSN IE used for handshake
 467  * @timeoutie: Pointer to the beginning of Timeout IE used for handshake
 468  * @ftie: Pointer to the beginning of FT IE
 469  * @mic: Pointer for writing MIC
 470  *
 471  * Calculate MIC for TDLS frame.
 472  */
 473 static int wpa_tdls_ftie_mic(const u8 *kck, u8 trans_seq, const u8 *lnkid,
 474                              const u8 *rsnie, const u8 *timeoutie,
 475                              const u8 *ftie, u8 *mic)
 476 {
 477         u8 *buf, *pos;
 478         struct wpa_tdls_ftie *_ftie;
 479         const struct wpa_tdls_lnkid *_lnkid;
 480         int ret;
 481         int len = 2 * ETH_ALEN + 1 + 2 + lnkid[1] + 2 + rsnie[1] +
 482                 2 + timeoutie[1] + 2 + ftie[1];
 483         buf = os_zalloc(len);
 484         if (!buf) {
 485                 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
 486                 return -1;
 487         }
 488
 489         pos = buf;
 490         _lnkid = (const struct wpa_tdls_lnkid *) lnkid;
 491         /* 1) TDLS initiator STA MAC address */
 492         os_memcpy(pos, _lnkid->init_sta, ETH_ALEN);
 493         pos += ETH_ALEN;
 494         /* 2) TDLS responder STA MAC address */
 495         os_memcpy(pos, _lnkid->resp_sta, ETH_ALEN);
 496         pos += ETH_ALEN;
 497         /* 3) Transaction Sequence number */
 498         *pos++ = trans_seq;
 499         /* 4) Link Identifier IE */
 500         os_memcpy(pos, lnkid, 2 + lnkid[1]);
 501         pos += 2 + lnkid[1];
 502         /* 5) RSN IE */
 503         os_memcpy(pos, rsnie, 2 + rsnie[1]);
 504         pos += 2 + rsnie[1];
 505         /* 6) Timeout Interval IE */
 506         os_memcpy(pos, timeoutie, 2 + timeoutie[1]);
 507         pos += 2 + timeoutie[1];
 508         /* 7) FTIE, with the MIC field of the FTIE set to 0 */
 509         os_memcpy(pos, ftie, 2 + ftie[1]);
 510         _ftie = (struct wpa_tdls_ftie *) pos;
 511         os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
 512         pos += 2 + ftie[1];
 513
 514         wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
 515         wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
 516         ret = omac1_aes_128(kck, buf, pos - buf, mic);
 517         os_free(buf);
 518         wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
 519         return ret;
 520 }
 521
 522
 523 /**
 524  * wpa_tdls_key_mic_teardown - Calculate TDLS FTIE MIC for Teardown frame
 525  * @kck: TPK-KCK
 526  * @trans_seq: Transaction Sequence Number (4 - Teardown)
 527  * @rcode: Reason code for Teardown
 528  * @dtoken: Dialog Token used for that particular link
 529  * @lnkid: Pointer to the beginning of Link Identifier IE
 530  * @ftie: Pointer to the beginning of FT IE
 531  * @mic: Pointer for writing MIC
 532  *
 533  * Calculate MIC for TDLS frame.
 534  */
 535 static int wpa_tdls_key_mic_teardown(const u8 *kck, u8 trans_seq, u16 rcode,
 536                                      u8 dtoken, const u8 *lnkid,
 537                                      const u8 *ftie, u8 *mic)
 538 {
 539         u8 *buf, *pos;
 540         struct wpa_tdls_ftie *_ftie;
 541         int ret;
 542         int len;
 543
 544         if (lnkid == NULL)
 545                 return -1;
 546
 547         len = 2 + lnkid[1] + sizeof(rcode) + sizeof(dtoken) +
 548                 sizeof(trans_seq) + 2 + ftie[1];
 549
 550         buf = os_zalloc(len);
 551         if (!buf) {
 552                 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
 553                 return -1;
 554         }
 555
 556         pos = buf;
 557         /* 1) Link Identifier IE */
 558         os_memcpy(pos, lnkid, 2 + lnkid[1]);
 559         pos += 2 + lnkid[1];
 560         /* 2) Reason Code */
 561         WPA_PUT_LE16(pos, rcode);
 562         pos += sizeof(rcode);
 563         /* 3) Dialog token */
 564         *pos++ = dtoken;
 565         /* 4) Transaction Sequence number */
 566         *pos++ = trans_seq;
 567         /* 7) FTIE, with the MIC field of the FTIE set to 0 */
 568         os_memcpy(pos, ftie, 2 + ftie[1]);
 569         _ftie = (struct wpa_tdls_ftie *) pos;
 570         os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
 571         pos += 2 + ftie[1];
 572
 573         wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
 574         wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
 575         ret = omac1_aes_128(kck, buf, pos - buf, mic);
 576         os_free(buf);
 577         wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
 578         return ret;
 579 }
 580
 581
 582 static int wpa_supplicant_verify_tdls_mic(u8 trans_seq,
 583                                           struct wpa_tdls_peer *peer,
 584                                           const u8 *lnkid, const u8 *timeoutie,
 585                                           const struct wpa_tdls_ftie *ftie)
 586 {
 587         u8 mic[16];
 588
 589         if (peer->tpk_set) {
 590                 wpa_tdls_ftie_mic(peer->tpk.kck, trans_seq, lnkid,
 591                                   peer->rsnie_p, timeoutie, (u8 *) ftie,
 592                                   mic);
 593                 if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
 594                         wpa_printf(MSG_INFO, "TDLS: Invalid MIC in FTIE - "
 595                                    "dropping packet");
 596                         wpa_hexdump(MSG_DEBUG, "TDLS: Received MIC",
 597                                     ftie->mic, 16);
 598                         wpa_hexdump(MSG_DEBUG, "TDLS: Calculated MIC",
 599                                     mic, 16);
 600                         return -1;
 601                 }
 602         } else {
 603                 wpa_printf(MSG_WARNING, "TDLS: Could not verify TDLS MIC, "
 604                            "TPK not set - dropping packet");
 605                 return -1;
 606         }
 607         return 0;
 608 }
 609
 610
 611 static int wpa_supplicant_verify_tdls_mic_teardown(
 612         u8 trans_seq, u16 rcode, u8 dtoken, struct wpa_tdls_peer *peer,
 613         const u8 *lnkid, const struct wpa_tdls_ftie *ftie)
 614 {
 615         u8 mic[16];
 616
 617         if (peer->tpk_set) {
 618                 wpa_tdls_key_mic_teardown(peer->tpk.kck, trans_seq, rcode,
 619                                           dtoken, lnkid, (u8 *) ftie, mic);
 620                 if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
 621                         wpa_printf(MSG_INFO, "TDLS: Invalid MIC in Teardown - "
 622                                    "dropping packet");
 623                         return -1;
 624                 }
 625         } else {
 626                 wpa_printf(MSG_INFO, "TDLS: Could not verify TDLS Teardown "
 627                            "MIC, TPK not set - dropping packet");
 628                 return -1;
 629         }
 630         return 0;
 631 }
 632
 633
 634 static void wpa_tdls_tpk_timeout(void *eloop_ctx, void *timeout_ctx)
 635 {
 636         struct wpa_sm *sm = eloop_ctx;
 637         struct wpa_tdls_peer *peer = timeout_ctx;
 638
 639         /*
 640          * On TPK lifetime expiration, we have an option of either tearing down
 641          * the direct link or trying to re-initiate it. The selection of what
 642          * to do is not strictly speaking controlled by our role in the expired
 643          * link, but for now, use that to select whether to renew or tear down
 644          * the link.
 645          */
 646
 647         if (peer->initiator) {
 648                 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
 649                            " - try to renew", MAC2STR(peer->addr));
 650                 wpa_tdls_start(sm, peer->addr);
 651         } else {
 652                 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
 653                            " - tear down", MAC2STR(peer->addr));
 654                 wpa_tdls_do_teardown(sm, peer,
 655                                      WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
 656         }
 657 }
 658
 659
 660 static void wpa_tdls_peer_remove_from_list(struct wpa_sm *sm,
 661                                            struct wpa_tdls_peer *peer)
 662 {
 663         struct wpa_tdls_peer *cur, *prev;
 664
 665         cur = sm->tdls;
 666         prev = NULL;
 667         while (cur && cur != peer) {
 668                 prev = cur;
 669                 cur = cur->next;
 670         }
 671
 672         if (cur != peer) {
 673                 wpa_printf(MSG_ERROR, "TDLS: Could not find peer " MACSTR
 674                            " to remove it from the list",
 675                            MAC2STR(peer->addr));
 676                 return;
 677         }
 678
 679         if (prev)
 680                 prev->next = peer->next;
 681         else
 682                 sm->tdls = peer->next;
 683 }
 684
 685
 686 static void wpa_tdls_peer_clear(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
 687 {
 688         wpa_printf(MSG_DEBUG, "TDLS: Clear state for peer " MACSTR,
 689                    MAC2STR(peer->addr));
 690         eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
 691         eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
 692         peer->reconfig_key = 0;
 693         peer->initiator = 0;
 694         peer->tpk_in_progress = 0;
 695         os_free(peer->sm_tmr.buf);
 696         peer->sm_tmr.buf = NULL;
 697         os_free(peer->ht_capabilities);
 698         peer->ht_capabilities = NULL;
 699         os_free(peer->vht_capabilities);
 700         peer->vht_capabilities = NULL;
 701         os_free(peer->ext_capab);
 702         peer->ext_capab = NULL;
 703         os_free(peer->supp_channels);
 704         peer->supp_channels = NULL;
 705         os_free(peer->supp_oper_classes);
 706         peer->supp_oper_classes = NULL;
 707         peer->rsnie_i_len = peer->rsnie_p_len = 0;
 708         peer->cipher = 0;
 709         peer->qos_info = 0;
 710         peer->wmm_capable = 0;
 711         peer->tk_set = peer->tpk_set = peer->tpk_success = 0;
 712         peer->chan_switch_enabled = 0;
 713         os_memset(&peer->tpk, 0, sizeof(peer->tpk));
 714         os_memset(peer->inonce, 0, WPA_NONCE_LEN);
 715         os_memset(peer->rnonce, 0, WPA_NONCE_LEN);
 716 }
 717
 718
 719 static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
 720 {
 721         wpa_tdls_peer_clear(sm, peer);
 722         wpa_tdls_peer_remove_from_list(sm, peer);
 723         os_free(peer);
 724 }
 725
 726
 727 static void wpa_tdls_linkid(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
 728                             struct wpa_tdls_lnkid *lnkid)
 729 {
 730         lnkid->ie_type = WLAN_EID_LINK_ID;
 731         lnkid->ie_len = 3 * ETH_ALEN;
 732         os_memcpy(lnkid->bssid, sm->bssid, ETH_ALEN);
 733         if (peer->initiator) {
 734                 os_memcpy(lnkid->init_sta, sm->own_addr, ETH_ALEN);
 735                 os_memcpy(lnkid->resp_sta, peer->addr, ETH_ALEN);
 736         } else {
 737                 os_memcpy(lnkid->init_sta, peer->addr, ETH_ALEN);
 738                 os_memcpy(lnkid->resp_sta, sm->own_addr, ETH_ALEN);
 739         }
 740 }
 741
 742
 743 static int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr,
 744                                   u16 reason_code)
 745 {
 746         struct wpa_tdls_peer *peer;
 747         struct wpa_tdls_ftie *ftie;
 748         struct wpa_tdls_lnkid lnkid;
 749         u8 dialog_token;
 750         u8 *rbuf, *pos;
 751         int ielen;
 752
 753         if (sm->tdls_disabled || !sm->tdls_supported)
 754                 return -1;
 755
 756         /* Find the node and free from the list */
 757         for (peer = sm->tdls; peer; peer = peer->next) {
 758                 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
 759                         break;
 760         }
 761
 762         if (peer == NULL) {
 763                 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
 764                            "Teardown " MACSTR, MAC2STR(addr));
 765                 return 0;
 766         }
 767
 768         /* Cancel active channel switch before teardown */
 769         if (peer->chan_switch_enabled) {
 770                 wpa_printf(MSG_DEBUG, "TDLS: First returning link with " MACSTR
 771                            " to base channel", MAC2STR(addr));
 772                 wpa_sm_tdls_disable_channel_switch(sm, peer->addr);
 773         }
 774
 775         dialog_token = peer->dtoken;
 776
 777         wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown for " MACSTR,
 778                    MAC2STR(addr));
 779
 780         ielen = 0;
 781         if (wpa_tdls_get_privacy(sm) && peer->tpk_set && peer->tpk_success) {
 782                 /* To add FTIE for Teardown request and compute MIC */
 783                 ielen += sizeof(*ftie);
 784 #ifdef CONFIG_TDLS_TESTING
 785                 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
 786                         ielen += 170;
 787 #endif /* CONFIG_TDLS_TESTING */
 788         }
 789
 790         rbuf = os_zalloc(ielen + 1);
 791         if (rbuf == NULL)
 792                 return -1;
 793         pos = rbuf;
 794
 795         if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success)
 796                 goto skip_ies;
 797
 798         ftie = (struct wpa_tdls_ftie *) pos;
 799         ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
 800         /* Using the recent nonce which should be for CONFIRM frame */
 801         os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
 802         os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
 803         ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
 804         pos = (u8 *) (ftie + 1);
 805 #ifdef CONFIG_TDLS_TESTING
 806         if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
 807                 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
 808                            "FTIE");
 809                 ftie->ie_len += 170;
 810                 *pos++ = 255; /* FTIE subelem */
 811                 *pos++ = 168; /* FTIE subelem length */
 812                 pos += 168;
 813         }
 814 #endif /* CONFIG_TDLS_TESTING */
 815         wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TDLS Teardown handshake",
 816                     (u8 *) ftie, pos - (u8 *) ftie);
 817
 818         /* compute MIC before sending */
 819         wpa_tdls_linkid(sm, peer, &lnkid);
 820         wpa_tdls_key_mic_teardown(peer->tpk.kck, 4, reason_code,
 821                                   dialog_token, (u8 *) &lnkid, (u8 *) ftie,
 822                                   ftie->mic);
 823
 824 skip_ies:
 825         /* TODO: register for a Timeout handler, if Teardown is not received at
 826          * the other end, then try again another time */
 827
 828         /* request driver to send Teardown using this FTIE */
 829         wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_TEARDOWN, 0,
 830                           reason_code, 0, peer->initiator, rbuf, pos - rbuf);
 831         os_free(rbuf);
 832
 833         return 0;
 834 }
 835
 836
 837 int wpa_tdls_teardown_link(struct wpa_sm *sm, const u8 *addr, u16 reason_code)
 838 {
 839         struct wpa_tdls_peer *peer;
 840
 841         if (sm->tdls_disabled || !sm->tdls_supported)
 842                 return -1;
 843
 844         for (peer = sm->tdls; peer; peer = peer->next) {
 845                 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
 846                         break;
 847         }
 848
 849         if (peer == NULL) {
 850                 wpa_printf(MSG_DEBUG, "TDLS: Could not find peer " MACSTR
 851                    " for link Teardown", MAC2STR(addr));
 852                 return -1;
 853         }
 854
 855         if (!peer->tpk_success) {
 856                 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR
 857                    " not connected - cannot Teardown link", MAC2STR(addr));
 858                 return -1;
 859         }
 860
 861         return wpa_tdls_do_teardown(sm, peer, reason_code);
 862 }
 863
 864
 865 static void wpa_tdls_disable_peer_link(struct wpa_sm *sm,
 866                                        struct wpa_tdls_peer *peer)
 867 {
 868         wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
 869         wpa_tdls_peer_free(sm, peer);
 870 }
 871
 872
 873 void wpa_tdls_disable_unreachable_link(struct wpa_sm *sm, const u8 *addr)
 874 {
 875         struct wpa_tdls_peer *peer;
 876
 877         for (peer = sm->tdls; peer; peer = peer->next) {
 878                 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
 879                         break;
 880         }
 881
 882         if (!peer || !peer->tpk_success) {
 883                 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR
 884                            " not connected - cannot teardown unreachable link",
 885                            MAC2STR(addr));
 886                 return;
 887         }
 888
 889         if (wpa_tdls_is_external_setup(sm)) {
 890                 /*
 891                  * Get us on the base channel, disable the link, send a
 892                  * teardown packet through the AP, and then reset link data.
 893                  */
 894                 if (peer->chan_switch_enabled)
 895                         wpa_sm_tdls_disable_channel_switch(sm, peer->addr);
 896                 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, addr);
 897                 wpa_tdls_send_teardown(sm, addr,
 898                                        WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE);
 899                 wpa_tdls_peer_free(sm, peer);
 900         } else {
 901                 wpa_tdls_disable_peer_link(sm, peer);
 902         }
 903 }
 904
 905
 906 const char * wpa_tdls_get_link_status(struct wpa_sm *sm, const u8 *addr)
 907 {
 908         struct wpa_tdls_peer *peer;
 909
 910         if (sm->tdls_disabled || !sm->tdls_supported)
 911                 return "disabled";
 912
 913         for (peer = sm->tdls; peer; peer = peer->next) {
 914                 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
 915                         break;
 916         }
 917
 918         if (peer == NULL)
 919                 return "peer does not exist";
 920
 921         if (!peer->tpk_success)
 922                 return "peer not connected";
 923
 924         return "connected";
 925 }
 926
 927
 928 static int wpa_tdls_recv_teardown(struct wpa_sm *sm, const u8 *src_addr,
 929                                   const u8 *buf, size_t len)
 930 {
 931         struct wpa_tdls_peer *peer = NULL;
 932         struct wpa_tdls_ftie *ftie;
 933         struct wpa_tdls_lnkid *lnkid;
 934         struct wpa_eapol_ie_parse kde;
 935         u16 reason_code;
 936         const u8 *pos;
 937         int ielen;
 938
 939         /* Find the node and free from the list */
 940         for (peer = sm->tdls; peer; peer = peer->next) {
 941                 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
 942                         break;
 943         }
 944
 945         if (peer == NULL) {
 946                 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
 947                            "Teardown " MACSTR, MAC2STR(src_addr));
 948                 return 0;
 949         }
 950
 951         pos = buf;
 952         pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
 953
 954         reason_code = WPA_GET_LE16(pos);
 955         pos += 2;
 956
 957         wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown Request from " MACSTR
 958                    " (reason code %u)", MAC2STR(src_addr), reason_code);
 959
 960         ielen = len - (pos - buf); /* start of IE in buf */
 961
 962         /*
 963          * Don't reject the message if failing to parse IEs. The IEs we need are
 964          * explicitly checked below. Some APs may add arbitrary padding to the
 965          * end of short TDLS frames and that would look like invalid IEs.
 966          */
 967         if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0)
 968                 wpa_printf(MSG_DEBUG,
 969                            "TDLS: Failed to parse IEs in Teardown - ignore as an interop workaround");
 970
 971         if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
 972                 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TDLS "
 973                            "Teardown");
 974                 return -1;
 975         }
 976         lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
 977
 978         if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success)
 979                 goto skip_ftie;
 980
 981         if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
 982                 wpa_printf(MSG_INFO, "TDLS: No FTIE in TDLS Teardown");
 983                 return -1;
 984         }
 985
 986         ftie = (struct wpa_tdls_ftie *) kde.ftie;
 987
 988         /* Process MIC check to see if TDLS Teardown is right */
 989         if (wpa_supplicant_verify_tdls_mic_teardown(4, reason_code,
 990                                                     peer->dtoken, peer,
 991                                                     (u8 *) lnkid, ftie) < 0) {
 992                 wpa_printf(MSG_DEBUG, "TDLS: MIC failure for TDLS "
 993                            "Teardown Request from " MACSTR, MAC2STR(src_addr));
 994                 return -1;
 995         }
 996
 997 skip_ftie:
 998         /*
 999          * Request the driver to disable the direct link and clear associated
1000          * keys.
1001          */
1002         wpa_tdls_disable_peer_link(sm, peer);
1003         return 0;
1004 }
1005
1006
1007 /**
1008  * wpa_tdls_send_error - To send suitable TDLS status response with
1009  *      appropriate status code mentioning reason for error/failure.
1010  * @dst         - MAC addr of Peer station
1011  * @tdls_action - TDLS frame type for which error code is sent
1012  * @initiator   - was this end the initiator of the connection
1013  * @status      - status code mentioning reason
1014  */
1015
1016 static int wpa_tdls_send_error(struct wpa_sm *sm, const u8 *dst,
1017                                u8 tdls_action, u8 dialog_token, int initiator,
1018                                u16 status)
1019 {
1020         wpa_printf(MSG_DEBUG, "TDLS: Sending error to " MACSTR
1021                    " (action=%u status=%u)",
1022                    MAC2STR(dst), tdls_action, status);
1023         return wpa_tdls_tpk_send(sm, dst, tdls_action, dialog_token, status,
1024                                  0, initiator, NULL, 0);
1025 }
1026
1027
1028 static struct wpa_tdls_peer *
1029 wpa_tdls_add_peer(struct wpa_sm *sm, const u8 *addr, int *existing)
1030 {
1031         struct wpa_tdls_peer *peer;
1032
1033         if (existing)
1034                 *existing = 0;
1035         for (peer = sm->tdls; peer; peer = peer->next) {
1036                 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) {
1037                         if (existing)
1038                                 *existing = 1;
1039                         return peer; /* re-use existing entry */
1040                 }
1041         }
1042
1043         wpa_printf(MSG_INFO, "TDLS: Creating peer entry for " MACSTR,
1044                    MAC2STR(addr));
1045
1046         peer = os_zalloc(sizeof(*peer));
1047         if (peer == NULL)
1048                 return NULL;
1049
1050         os_memcpy(peer->addr, addr, ETH_ALEN);
1051         peer->next = sm->tdls;
1052         sm->tdls = peer;
1053
1054         return peer;
1055 }
1056
1057
1058 static int wpa_tdls_send_tpk_m1(struct wpa_sm *sm,
1059                                 struct wpa_tdls_peer *peer)
1060 {
1061         size_t buf_len;
1062         struct wpa_tdls_timeoutie timeoutie;
1063         u16 rsn_capab;
1064         struct wpa_tdls_ftie *ftie;
1065         u8 *rbuf, *pos, *count_pos;
1066         u16 count;
1067         struct rsn_ie_hdr *hdr;
1068         int status;
1069
1070         if (!wpa_tdls_get_privacy(sm)) {
1071                 wpa_printf(MSG_DEBUG, "TDLS: No security used on the link");
1072                 peer->rsnie_i_len = 0;
1073                 goto skip_rsnie;
1074         }
1075
1076         /*
1077          * TPK Handshake Message 1:
1078          * FTIE: ANonce=0, SNonce=initiator nonce MIC=0, DataKDs=(RSNIE_I,
1079          * Timeout Interval IE))
1080          */
1081
1082         /* Filling RSN IE */
1083         hdr = (struct rsn_ie_hdr *) peer->rsnie_i;
1084         hdr->elem_id = WLAN_EID_RSN;
1085         WPA_PUT_LE16(hdr->version, RSN_VERSION);
1086
1087         pos = (u8 *) (hdr + 1);
1088         RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
1089         pos += RSN_SELECTOR_LEN;
1090         count_pos = pos;
1091         pos += 2;
1092
1093         count = 0;
1094
1095         /*
1096          * AES-CCMP is the default Encryption preferred for TDLS, so
1097          * RSN IE is filled only with CCMP CIPHER
1098          * Note: TKIP is not used to encrypt TDLS link.
1099          *
1100          * Regardless of the cipher used on the AP connection, select CCMP
1101          * here.
1102          */
1103         RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1104         pos += RSN_SELECTOR_LEN;
1105         count++;
1106
1107         WPA_PUT_LE16(count_pos, count);
1108
1109         WPA_PUT_LE16(pos, 1);
1110         pos += 2;
1111         RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
1112         pos += RSN_SELECTOR_LEN;
1113
1114         rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1115         rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
1116 #ifdef CONFIG_TDLS_TESTING
1117         if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
1118                 wpa_printf(MSG_DEBUG, "TDLS: Use alternative RSN IE for "
1119                            "testing");
1120                 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1121         }
1122 #endif /* CONFIG_TDLS_TESTING */
1123         WPA_PUT_LE16(pos, rsn_capab);
1124         pos += 2;
1125 #ifdef CONFIG_TDLS_TESTING
1126         if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
1127                 /* Number of PMKIDs */
1128                 *pos++ = 0x00;
1129                 *pos++ = 0x00;
1130         }
1131 #endif /* CONFIG_TDLS_TESTING */
1132
1133         hdr->len = (pos - peer->rsnie_i) - 2;
1134         peer->rsnie_i_len = pos - peer->rsnie_i;
1135         wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
1136                     peer->rsnie_i, peer->rsnie_i_len);
1137
1138 skip_rsnie:
1139         buf_len = 0;
1140         if (wpa_tdls_get_privacy(sm))
1141                 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1142                         sizeof(struct wpa_tdls_timeoutie);
1143 #ifdef CONFIG_TDLS_TESTING
1144         if (wpa_tdls_get_privacy(sm) &&
1145             (tdls_testing & TDLS_TESTING_LONG_FRAME))
1146                 buf_len += 170;
1147         if (tdls_testing & TDLS_TESTING_DIFF_BSSID)
1148                 buf_len += sizeof(struct wpa_tdls_lnkid);
1149 #endif /* CONFIG_TDLS_TESTING */
1150         rbuf = os_zalloc(buf_len + 1);
1151         if (rbuf == NULL) {
1152                 wpa_tdls_peer_free(sm, peer);
1153                 return -1;
1154         }
1155         pos = rbuf;
1156
1157         if (!wpa_tdls_get_privacy(sm))
1158                 goto skip_ies;
1159
1160         /* Initiator RSN IE */
1161         pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len);
1162
1163         ftie = (struct wpa_tdls_ftie *) pos;
1164         ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1165         ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1166
1167         if (os_get_random(peer->inonce, WPA_NONCE_LEN)) {
1168                 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1169                         "TDLS: Failed to get random data for initiator Nonce");
1170                 os_free(rbuf);
1171                 wpa_tdls_peer_free(sm, peer);
1172                 return -1;
1173         }
1174         peer->tk_set = 0; /* A new nonce results in a new TK */
1175         wpa_hexdump(MSG_DEBUG, "TDLS: Initiator Nonce for TPK handshake",
1176                     peer->inonce, WPA_NONCE_LEN);
1177         os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1178
1179         wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK Handshake M1",
1180                     (u8 *) ftie, sizeof(struct wpa_tdls_ftie));
1181
1182         pos = (u8 *) (ftie + 1);
1183
1184 #ifdef CONFIG_TDLS_TESTING
1185         if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1186                 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1187                            "FTIE");
1188                 ftie->ie_len += 170;
1189                 *pos++ = 255; /* FTIE subelem */
1190                 *pos++ = 168; /* FTIE subelem length */
1191                 pos += 168;
1192         }
1193 #endif /* CONFIG_TDLS_TESTING */
1194
1195         /* Lifetime */
1196         peer->lifetime = TPK_LIFETIME;
1197 #ifdef CONFIG_TDLS_TESTING
1198         if (tdls_testing & TDLS_TESTING_SHORT_LIFETIME) {
1199                 wpa_printf(MSG_DEBUG, "TDLS: Testing - use short TPK "
1200                            "lifetime");
1201                 peer->lifetime = 301;
1202         }
1203         if (tdls_testing & TDLS_TESTING_LONG_LIFETIME) {
1204                 wpa_printf(MSG_DEBUG, "TDLS: Testing - use long TPK "
1205                            "lifetime");
1206                 peer->lifetime = 0xffffffff;
1207         }
1208 #endif /* CONFIG_TDLS_TESTING */
1209         pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1210                                      sizeof(timeoutie), peer->lifetime);
1211         wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime);
1212
1213 skip_ies:
1214
1215 #ifdef CONFIG_TDLS_TESTING
1216         if (tdls_testing & TDLS_TESTING_DIFF_BSSID) {
1217                 wpa_printf(MSG_DEBUG, "TDLS: Testing - use incorrect BSSID in "
1218                            "Link Identifier");
1219                 struct wpa_tdls_lnkid *l = (struct wpa_tdls_lnkid *) pos;
1220                 wpa_tdls_linkid(sm, peer, l);
1221                 l->bssid[5] ^= 0x01;
1222                 pos += sizeof(*l);
1223         }
1224 #endif /* CONFIG_TDLS_TESTING */
1225
1226         wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Request / TPK "
1227                    "Handshake Message 1 (peer " MACSTR ")",
1228                    MAC2STR(peer->addr));
1229
1230         status = wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_SETUP_REQUEST,
1231                                    1, 0, 0, peer->initiator, rbuf, pos - rbuf);
1232         os_free(rbuf);
1233
1234         return status;
1235 }
1236
1237
1238 static int wpa_tdls_send_tpk_m2(struct wpa_sm *sm,
1239                                 const unsigned char *src_addr, u8 dtoken,
1240                                 struct wpa_tdls_lnkid *lnkid,
1241                                 const struct wpa_tdls_peer *peer)
1242 {
1243         u8 *rbuf, *pos;
1244         size_t buf_len;
1245         u32 lifetime;
1246         struct wpa_tdls_timeoutie timeoutie;
1247         struct wpa_tdls_ftie *ftie;
1248         int status;
1249
1250         buf_len = 0;
1251         if (wpa_tdls_get_privacy(sm)) {
1252                 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1253                  * Lifetime */
1254                 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1255                         sizeof(struct wpa_tdls_timeoutie);
1256 #ifdef CONFIG_TDLS_TESTING
1257                 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1258                         buf_len += 170;
1259 #endif /* CONFIG_TDLS_TESTING */
1260         }
1261
1262         rbuf = os_zalloc(buf_len + 1);
1263         if (rbuf == NULL)
1264                 return -1;
1265         pos = rbuf;
1266
1267         if (!wpa_tdls_get_privacy(sm))
1268                 goto skip_ies;
1269
1270         /* Peer RSN IE */
1271         pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1272
1273         ftie = (struct wpa_tdls_ftie *) pos;
1274         ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1275         /* TODO: ftie->mic_control to set 2-RESPONSE */
1276         os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1277         os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1278         ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1279         wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK M2",
1280                     (u8 *) ftie, sizeof(*ftie));
1281
1282         pos = (u8 *) (ftie + 1);
1283
1284 #ifdef CONFIG_TDLS_TESTING
1285         if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1286                 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1287                            "FTIE");
1288                 ftie->ie_len += 170;
1289                 *pos++ = 255; /* FTIE subelem */
1290                 *pos++ = 168; /* FTIE subelem length */
1291                 pos += 168;
1292         }
1293 #endif /* CONFIG_TDLS_TESTING */
1294
1295         /* Lifetime */
1296         lifetime = peer->lifetime;
1297 #ifdef CONFIG_TDLS_TESTING
1298         if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_RESP) {
1299                 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1300                            "lifetime in response");
1301                 lifetime++;
1302         }
1303 #endif /* CONFIG_TDLS_TESTING */
1304         pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1305                                      sizeof(timeoutie), lifetime);
1306         wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds from initiator",
1307                    lifetime);
1308
1309         /* compute MIC before sending */
1310         wpa_tdls_ftie_mic(peer->tpk.kck, 2, (u8 *) lnkid, peer->rsnie_p,
1311                           (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1312 #ifdef CONFIG_TDLS_TESTING
1313         if (tdls_testing & TDLS_TESTING_WRONG_MIC) {
1314                 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong MIC");
1315                 ftie->mic[0] ^= 0x01;
1316         }
1317 #endif /* CONFIG_TDLS_TESTING */
1318
1319 skip_ies:
1320         status = wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE,
1321                                    dtoken, 0, 0, peer->initiator, rbuf,
1322                                    pos - rbuf);
1323         os_free(rbuf);
1324
1325         return status;
1326 }
1327
1328
1329 static int wpa_tdls_send_tpk_m3(struct wpa_sm *sm,
1330                                 const unsigned char *src_addr, u8 dtoken,
1331                                 struct wpa_tdls_lnkid *lnkid,
1332                                 const struct wpa_tdls_peer *peer)
1333 {
1334         u8 *rbuf, *pos;
1335         size_t buf_len;
1336         struct wpa_tdls_ftie *ftie;
1337         struct wpa_tdls_timeoutie timeoutie;
1338         u32 lifetime;
1339         int status;
1340         u32 peer_capab = 0;
1341
1342         buf_len = 0;
1343         if (wpa_tdls_get_privacy(sm)) {
1344                 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1345                  * Lifetime */
1346                 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1347                         sizeof(struct wpa_tdls_timeoutie);
1348 #ifdef CONFIG_TDLS_TESTING
1349                 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1350                         buf_len += 170;
1351 #endif /* CONFIG_TDLS_TESTING */
1352         }
1353
1354         rbuf = os_zalloc(buf_len + 1);
1355         if (rbuf == NULL)
1356                 return -1;
1357         pos = rbuf;
1358
1359         if (!wpa_tdls_get_privacy(sm))
1360                 goto skip_ies;
1361
1362         /* Peer RSN IE */
1363         pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1364
1365         ftie = (struct wpa_tdls_ftie *) pos;
1366         ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1367         /*TODO: ftie->mic_control to set 3-CONFIRM */
1368         os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1369         os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1370         ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1371
1372         pos = (u8 *) (ftie + 1);
1373
1374 #ifdef CONFIG_TDLS_TESTING
1375         if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1376                 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1377                            "FTIE");
1378                 ftie->ie_len += 170;
1379                 *pos++ = 255; /* FTIE subelem */
1380                 *pos++ = 168; /* FTIE subelem length */
1381                 pos += 168;
1382         }
1383 #endif /* CONFIG_TDLS_TESTING */
1384
1385         /* Lifetime */
1386         lifetime = peer->lifetime;
1387 #ifdef CONFIG_TDLS_TESTING
1388         if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_CONF) {
1389                 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1390                            "lifetime in confirm");
1391                 lifetime++;
1392         }
1393 #endif /* CONFIG_TDLS_TESTING */
1394         pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1395                                      sizeof(timeoutie), lifetime);
1396         wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds",
1397                    lifetime);
1398
1399         /* compute MIC before sending */
1400         wpa_tdls_ftie_mic(peer->tpk.kck, 3, (u8 *) lnkid, peer->rsnie_p,
1401                           (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1402 #ifdef CONFIG_TDLS_TESTING
1403         if (tdls_testing & TDLS_TESTING_WRONG_MIC) {
1404                 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong MIC");
1405                 ftie->mic[0] ^= 0x01;
1406         }
1407 #endif /* CONFIG_TDLS_TESTING */
1408
1409 skip_ies:
1410
1411         if (peer->vht_capabilities)
1412                 peer_capab |= TDLS_PEER_VHT;
1413         if (peer->ht_capabilities)
1414                 peer_capab |= TDLS_PEER_HT;
1415         if (peer->wmm_capable)
1416                 peer_capab |= TDLS_PEER_WMM;
1417
1418         status = wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM,
1419                                    dtoken, 0, peer_capab, peer->initiator,
1420                                    rbuf, pos - rbuf);
1421         os_free(rbuf);
1422
1423         return status;
1424 }
1425
1426
1427 static int wpa_tdls_send_discovery_response(struct wpa_sm *sm,
1428                                             struct wpa_tdls_peer *peer,
1429                                             u8 dialog_token)
1430 {
1431         size_t buf_len = 0;
1432         struct wpa_tdls_timeoutie timeoutie;
1433         u16 rsn_capab;
1434         u8 *rbuf, *pos, *count_pos;
1435         u16 count;
1436         struct rsn_ie_hdr *hdr;
1437         int status;
1438
1439         wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Discovery Response "
1440                    "(peer " MACSTR ")", MAC2STR(peer->addr));
1441         if (!wpa_tdls_get_privacy(sm))
1442                 goto skip_rsn_ies;
1443
1444         /* Filling RSN IE */
1445         hdr = (struct rsn_ie_hdr *) peer->rsnie_i;
1446         hdr->elem_id = WLAN_EID_RSN;
1447         WPA_PUT_LE16(hdr->version, RSN_VERSION);
1448         pos = (u8 *) (hdr + 1);
1449         RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
1450         pos += RSN_SELECTOR_LEN;
1451         count_pos = pos;
1452         pos += 2;
1453         count = 0;
1454
1455         /*
1456         * AES-CCMP is the default encryption preferred for TDLS, so
1457         * RSN IE is filled only with CCMP cipher suite.
1458         * Note: TKIP is not used to encrypt TDLS link.
1459         *
1460         * Regardless of the cipher used on the AP connection, select CCMP
1461         * here.
1462         */
1463         RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1464         pos += RSN_SELECTOR_LEN;
1465         count++;
1466         WPA_PUT_LE16(count_pos, count);
1467         WPA_PUT_LE16(pos, 1);
1468         pos += 2;
1469         RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
1470         pos += RSN_SELECTOR_LEN;
1471
1472         rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1473         rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
1474         WPA_PUT_LE16(pos, rsn_capab);
1475         pos += 2;
1476         hdr->len = (pos - (u8 *) hdr) - 2;
1477         peer->rsnie_i_len = pos - peer->rsnie_i;
1478
1479         wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for Discovery Response",
1480                     (u8 *) hdr, hdr->len + 2);
1481 skip_rsn_ies:
1482         buf_len = 0;
1483         if (wpa_tdls_get_privacy(sm)) {
1484                 /* Peer RSN IE, Lifetime */
1485                 buf_len += peer->rsnie_i_len +
1486                         sizeof(struct wpa_tdls_timeoutie);
1487         }
1488         rbuf = os_zalloc(buf_len + 1);
1489         if (rbuf == NULL) {
1490                 wpa_tdls_peer_free(sm, peer);
1491                 return -1;
1492         }
1493         pos = rbuf;
1494
1495         if (!wpa_tdls_get_privacy(sm))
1496                 goto skip_ies;
1497         /* Initiator RSN IE */
1498         pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len);
1499         /* Lifetime */
1500         peer->lifetime = TPK_LIFETIME;
1501         pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1502                                      sizeof(timeoutie), peer->lifetime);
1503         wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime);
1504 skip_ies:
1505         status = wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_DISCOVERY_RESPONSE,
1506                                    dialog_token, 0, 0, 0, rbuf, pos - rbuf);
1507         os_free(rbuf);
1508
1509         return status;
1510 }
1511
1512
1513 static int
1514 wpa_tdls_process_discovery_request(struct wpa_sm *sm, const u8 *addr,
1515                                    const u8 *buf, size_t len)
1516 {
1517         struct wpa_eapol_ie_parse kde;
1518         const struct wpa_tdls_lnkid *lnkid;
1519         struct wpa_tdls_peer *peer;
1520         size_t min_req_len = sizeof(struct wpa_tdls_frame) +
1521                 1 /* dialog token */ + sizeof(struct wpa_tdls_lnkid);
1522         u8 dialog_token;
1523
1524         wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from " MACSTR,
1525                    MAC2STR(addr));
1526
1527         if (len < min_req_len) {
1528                 wpa_printf(MSG_DEBUG, "TDLS Discovery Request is too short: "
1529                            "%d", (int) len);
1530                 return -1;
1531         }
1532
1533         dialog_token = buf[sizeof(struct wpa_tdls_frame)];
1534
1535         /*
1536          * Some APs will tack on a weird IE to the end of a TDLS
1537          * discovery request packet. This needn't fail the response,
1538          * since the required IE are verified separately.
1539          */
1540         if (wpa_supplicant_parse_ies(buf + sizeof(struct wpa_tdls_frame) + 1,
1541                                      len - (sizeof(struct wpa_tdls_frame) + 1),
1542                                      &kde) < 0) {
1543                 wpa_printf(MSG_DEBUG,
1544                            "TDLS: Failed to parse IEs in Discovery Request - ignore as an interop workaround");
1545         }
1546
1547         if (!kde.lnkid) {
1548                 wpa_printf(MSG_DEBUG, "TDLS: Link ID not found in Discovery "
1549                            "Request");
1550                 return -1;
1551         }
1552
1553         lnkid = (const struct wpa_tdls_lnkid *) kde.lnkid;
1554
1555         if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1556                 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from different "
1557                            " BSS " MACSTR, MAC2STR(lnkid->bssid));
1558                 return -1;
1559         }
1560
1561         peer = wpa_tdls_add_peer(sm, addr, NULL);
1562         if (peer == NULL)
1563                 return -1;
1564
1565         return wpa_tdls_send_discovery_response(sm, peer, dialog_token);
1566 }
1567
1568
1569 int wpa_tdls_send_discovery_request(struct wpa_sm *sm, const u8 *addr)
1570 {
1571         if (sm->tdls_disabled || !sm->tdls_supported)
1572                 return -1;
1573
1574         wpa_printf(MSG_DEBUG, "TDLS: Sending Discovery Request to peer "
1575                    MACSTR, MAC2STR(addr));
1576         return wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_DISCOVERY_REQUEST,
1577                                  1, 0, 0, 1, NULL, 0);
1578 }
1579
1580
1581 static int copy_supp_rates(const struct wpa_eapol_ie_parse *kde,
1582                            struct wpa_tdls_peer *peer)
1583 {
1584         if (!kde->supp_rates) {
1585                 wpa_printf(MSG_DEBUG, "TDLS: No supported rates received");
1586                 return -1;
1587         }
1588         peer->supp_rates_len = merge_byte_arrays(
1589                 peer->supp_rates, sizeof(peer->supp_rates),
1590                 kde->supp_rates + 2, kde->supp_rates_len - 2,
1591                 kde->ext_supp_rates ? kde->ext_supp_rates + 2 : NULL,
1592                 kde->ext_supp_rates_len - 2);
1593         return 0;
1594 }
1595
1596
1597 static int copy_peer_ht_capab(const struct wpa_eapol_ie_parse *kde,
1598                               struct wpa_tdls_peer *peer)
1599 {
1600         if (!kde->ht_capabilities) {
1601                 wpa_printf(MSG_DEBUG, "TDLS: No supported ht capabilities "
1602                            "received");
1603                 return 0;
1604         }
1605
1606         if (!peer->ht_capabilities) {
1607                 peer->ht_capabilities =
1608                         os_zalloc(sizeof(struct ieee80211_ht_capabilities));
1609                 if (peer->ht_capabilities == NULL)
1610                         return -1;
1611         }
1612
1613         os_memcpy(peer->ht_capabilities, kde->ht_capabilities,
1614                   sizeof(struct ieee80211_ht_capabilities));
1615         wpa_hexdump(MSG_DEBUG, "TDLS: Peer HT capabilities",
1616                     (u8 *) peer->ht_capabilities,
1617                     sizeof(struct ieee80211_ht_capabilities));
1618
1619         return 0;
1620 }
1621
1622
1623 static int copy_peer_vht_capab(const struct wpa_eapol_ie_parse *kde,
1624                               struct wpa_tdls_peer *peer)
1625 {
1626         if (!kde->vht_capabilities) {
1627                 wpa_printf(MSG_DEBUG, "TDLS: No supported vht capabilities "
1628                            "received");
1629                 return 0;
1630         }
1631
1632         if (!peer->vht_capabilities) {
1633                 peer->vht_capabilities =
1634                         os_zalloc(sizeof(struct ieee80211_vht_capabilities));
1635                 if (peer->vht_capabilities == NULL)
1636                         return -1;
1637         }
1638
1639         os_memcpy(peer->vht_capabilities, kde->vht_capabilities,
1640                   sizeof(struct ieee80211_vht_capabilities));
1641         wpa_hexdump(MSG_DEBUG, "TDLS: Peer VHT capabilities",
1642                     (u8 *) peer->vht_capabilities,
1643                     sizeof(struct ieee80211_vht_capabilities));
1644
1645         return 0;
1646 }
1647
1648
1649 static int copy_peer_ext_capab(const struct wpa_eapol_ie_parse *kde,
1650                                struct wpa_tdls_peer *peer)
1651 {
1652         if (!kde->ext_capab) {
1653                 wpa_printf(MSG_DEBUG, "TDLS: No extended capabilities "
1654                            "received");
1655                 return 0;
1656         }
1657
1658         if (!peer->ext_capab || peer->ext_capab_len < kde->ext_capab_len - 2) {
1659                 /* Need to allocate buffer to fit the new information */
1660                 os_free(peer->ext_capab);
1661                 peer->ext_capab = os_zalloc(kde->ext_capab_len - 2);
1662                 if (peer->ext_capab == NULL)
1663                         return -1;
1664         }
1665
1666         peer->ext_capab_len = kde->ext_capab_len - 2;
1667         os_memcpy(peer->ext_capab, kde->ext_capab + 2, peer->ext_capab_len);
1668
1669         return 0;
1670 }
1671
1672
1673 static int copy_peer_wmm_capab(const struct wpa_eapol_ie_parse *kde,
1674                                struct wpa_tdls_peer *peer)
1675 {
1676         struct wmm_information_element *wmm;
1677
1678         if (!kde->wmm) {
1679                 wpa_printf(MSG_DEBUG, "TDLS: No supported WMM capabilities received");
1680                 return 0;
1681         }
1682
1683         if (kde->wmm_len < sizeof(struct wmm_information_element)) {
1684                 wpa_printf(MSG_DEBUG, "TDLS: Invalid supported WMM capabilities received");
1685                 return -1;
1686         }
1687
1688         wmm = (struct wmm_information_element *) kde->wmm;
1689         peer->qos_info = wmm->qos_info;
1690
1691         peer->wmm_capable = 1;
1692
1693         wpa_printf(MSG_DEBUG, "TDLS: Peer WMM QOS Info 0x%x", peer->qos_info);
1694         return 0;
1695 }
1696
1697
1698 static int copy_peer_supp_channels(const struct wpa_eapol_ie_parse *kde,
1699                                    struct wpa_tdls_peer *peer)
1700 {
1701         if (!kde->supp_channels) {
1702                 wpa_printf(MSG_DEBUG, "TDLS: No supported channels received");
1703                 return 0;
1704         }
1705
1706         if (!peer->supp_channels ||
1707             peer->supp_channels_len < kde->supp_channels_len) {
1708                 os_free(peer->supp_channels);
1709                 peer->supp_channels = os_zalloc(kde->supp_channels_len);
1710                 if (peer->supp_channels == NULL)
1711                         return -1;
1712         }
1713
1714         peer->supp_channels_len = kde->supp_channels_len;
1715
1716         os_memcpy(peer->supp_channels, kde->supp_channels,
1717                   peer->supp_channels_len);
1718         wpa_hexdump(MSG_DEBUG, "TDLS: Peer Supported Channels",
1719                     (u8 *) peer->supp_channels, peer->supp_channels_len);
1720         return 0;
1721 }
1722
1723
1724 static int copy_peer_supp_oper_classes(const struct wpa_eapol_ie_parse *kde,
1725                                        struct wpa_tdls_peer *peer)
1726 {
1727         if (!kde->supp_oper_classes) {
1728                 wpa_printf(MSG_DEBUG, "TDLS: No supported operating classes received");
1729                 return 0;
1730         }
1731
1732         if (!peer->supp_oper_classes ||
1733             peer->supp_oper_classes_len < kde->supp_oper_classes_len) {
1734                 os_free(peer->supp_oper_classes);
1735                 peer->supp_oper_classes = os_zalloc(kde->supp_oper_classes_len);
1736                 if (peer->supp_oper_classes == NULL)
1737                         return -1;
1738         }
1739
1740         peer->supp_oper_classes_len = kde->supp_oper_classes_len;
1741         os_memcpy(peer->supp_oper_classes, kde->supp_oper_classes,
1742                   peer->supp_oper_classes_len);
1743         wpa_hexdump(MSG_DEBUG, "TDLS: Peer Supported Operating Classes",
1744                     (u8 *) peer->supp_oper_classes,
1745                     peer->supp_oper_classes_len);
1746         return 0;
1747 }
1748
1749
1750 static int wpa_tdls_addset_peer(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
1751                                 int add)
1752 {
1753         return wpa_sm_tdls_peer_addset(sm, peer->addr, add, peer->aid,
1754                                        peer->capability,
1755                                        peer->supp_rates, peer->supp_rates_len,
1756                                        peer->ht_capabilities,
1757                                        peer->vht_capabilities,
1758                                        peer->qos_info, peer->wmm_capable,
1759                                        peer->ext_capab, peer->ext_capab_len,
1760                                        peer->supp_channels,
1761                                        peer->supp_channels_len,
1762                                        peer->supp_oper_classes,
1763                                        peer->supp_oper_classes_len);
1764 }
1765
1766
1767 static int tdls_nonce_set(const u8 *nonce)
1768 {
1769         int i;
1770
1771         for (i = 0; i < WPA_NONCE_LEN; i++) {
1772                 if (nonce[i])
1773                         return 1;
1774         }
1775
1776         return 0;
1777 }
1778
1779
1780 static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr,
1781                                    const u8 *buf, size_t len)
1782 {
1783         struct wpa_tdls_peer *peer;
1784         struct wpa_eapol_ie_parse kde;
1785         struct wpa_ie_data ie;
1786         int cipher;
1787         const u8 *cpos;
1788         struct wpa_tdls_ftie *ftie = NULL;
1789         struct wpa_tdls_timeoutie *timeoutie;
1790         struct wpa_tdls_lnkid *lnkid;
1791         u32 lifetime = 0;
1792 #if 0
1793         struct rsn_ie_hdr *hdr;
1794         u8 *pos;
1795         u16 rsn_capab;
1796         u16 rsn_ver;
1797 #endif
1798         u8 dtoken;
1799         u16 ielen;
1800         u16 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
1801         int tdls_prohibited = sm->tdls_prohibited;
1802         int existing_peer = 0;
1803
1804         if (len < 3 + 3)
1805                 return -1;
1806
1807         cpos = buf;
1808         cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1809
1810         /* driver had already verified the frame format */
1811         dtoken = *cpos++; /* dialog token */
1812
1813         wpa_printf(MSG_INFO, "TDLS: Dialog Token in TPK M1 %d", dtoken);
1814
1815         peer = wpa_tdls_add_peer(sm, src_addr, &existing_peer);
1816         if (peer == NULL)
1817                 goto error;
1818
1819         /* If found, use existing entry instead of adding a new one;
1820          * how to handle the case where both ends initiate at the
1821          * same time? */
1822         if (existing_peer) {
1823                 if (peer->tpk_success) {
1824                         wpa_printf(MSG_DEBUG, "TDLS: TDLS Setup Request while "
1825                                    "direct link is enabled - tear down the "
1826                                    "old link first");
1827                         wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
1828                         wpa_tdls_peer_clear(sm, peer);
1829                 } else if (peer->initiator) {
1830                         /*
1831                          * An entry is already present, so check if we already
1832                          * sent a TDLS Setup Request. If so, compare MAC
1833                          * addresses and let the STA with the lower MAC address
1834                          * continue as the initiator. The other negotiation is
1835                          * terminated.
1836                          */
1837                         if (os_memcmp(sm->own_addr, src_addr, ETH_ALEN) < 0) {
1838                                 wpa_printf(MSG_DEBUG, "TDLS: Discard request "
1839                                            "from peer with higher address "
1840                                            MACSTR, MAC2STR(src_addr));
1841                                 return -1;
1842                         } else {
1843                                 wpa_printf(MSG_DEBUG, "TDLS: Accept request "
1844                                            "from peer with lower address "
1845                                            MACSTR " (terminate previously "
1846                                            "initiated negotiation",
1847                                            MAC2STR(src_addr));
1848                                 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK,
1849                                                  peer->addr);
1850                                 wpa_tdls_peer_clear(sm, peer);
1851                         }
1852                 }
1853         }
1854
1855         /* capability information */
1856         peer->capability = WPA_GET_LE16(cpos);
1857         cpos += 2;
1858
1859         ielen = len - (cpos - buf); /* start of IE in buf */
1860
1861         /*
1862          * Don't reject the message if failing to parse IEs. The IEs we need are
1863          * explicitly checked below. Some APs may add arbitrary padding to the
1864          * end of short TDLS frames and that would look like invalid IEs.
1865          */
1866         if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0)
1867                 wpa_printf(MSG_DEBUG,
1868                            "TDLS: Failed to parse IEs in TPK M1 - ignore as an interop workaround");
1869
1870         if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1871                 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
1872                            "TPK M1");
1873                 goto error;
1874         }
1875         wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M1",
1876                     kde.lnkid, kde.lnkid_len);
1877         lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1878         if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1879                 wpa_printf(MSG_INFO, "TDLS: TPK M1 from diff BSS");
1880                 status = WLAN_STATUS_REQUEST_DECLINED;
1881                 goto error;
1882         }
1883
1884         wpa_printf(MSG_DEBUG, "TDLS: TPK M1 - TPK initiator " MACSTR,
1885                    MAC2STR(src_addr));
1886
1887         if (copy_supp_rates(&kde, peer) < 0)
1888                 goto error;
1889
1890         if (copy_peer_ht_capab(&kde, peer) < 0)
1891                 goto error;
1892
1893         if (copy_peer_vht_capab(&kde, peer) < 0)
1894                 goto error;
1895
1896         if (copy_peer_ext_capab(&kde, peer) < 0)
1897                 goto error;
1898
1899         if (copy_peer_supp_channels(&kde, peer) < 0)
1900                 goto error;
1901
1902         if (copy_peer_supp_oper_classes(&kde, peer) < 0)
1903                 goto error;
1904
1905         peer->qos_info = kde.qosinfo;
1906
1907         /* Overwrite with the qos_info obtained in WMM IE */
1908         if (copy_peer_wmm_capab(&kde, peer) < 0)
1909                 goto error;
1910
1911         peer->aid = kde.aid;
1912
1913 #ifdef CONFIG_TDLS_TESTING
1914         if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
1915                 peer = wpa_tdls_add_peer(sm, src_addr, NULL);
1916                 if (peer == NULL)
1917                         goto error;
1918                 wpa_printf(MSG_DEBUG, "TDLS: Testing concurrent initiation of "
1919                            "TDLS setup - send own request");
1920                 peer->initiator = 1;
1921                 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL,
1922                                         NULL, 0, 0, NULL, 0, NULL, 0, NULL, 0);
1923                 wpa_tdls_send_tpk_m1(sm, peer);
1924         }
1925
1926         if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
1927             tdls_prohibited) {
1928                 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
1929                            "on TDLS");
1930                 tdls_prohibited = 0;
1931         }
1932 #endif /* CONFIG_TDLS_TESTING */
1933
1934         if (tdls_prohibited) {
1935                 wpa_printf(MSG_INFO, "TDLS: TDLS prohibited in this BSS");
1936                 status = WLAN_STATUS_REQUEST_DECLINED;
1937                 goto error;
1938         }
1939
1940         if (!wpa_tdls_get_privacy(sm)) {
1941                 if (kde.rsn_ie) {
1942                         wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M1 while "
1943                                    "security is disabled");
1944                         status = WLAN_STATUS_SECURITY_DISABLED;
1945                         goto error;
1946                 }
1947                 goto skip_rsn;
1948         }
1949
1950         if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
1951             kde.rsn_ie == NULL) {
1952                 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M1");
1953                 status = WLAN_STATUS_INVALID_PARAMETERS;
1954                 goto error;
1955         }
1956
1957         if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
1958                 wpa_printf(MSG_INFO, "TDLS: Too long Initiator RSN IE in "
1959                            "TPK M1");
1960                 status = WLAN_STATUS_INVALID_RSNIE;
1961                 goto error;
1962         }
1963
1964         if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
1965                 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M1");
1966                 status = WLAN_STATUS_INVALID_RSNIE;
1967                 goto error;
1968         }
1969
1970         cipher = ie.pairwise_cipher;
1971         if (cipher & WPA_CIPHER_CCMP) {
1972                 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
1973                 cipher = WPA_CIPHER_CCMP;
1974         } else {
1975                 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M1");
1976                 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
1977                 goto error;
1978         }
1979
1980         if ((ie.capabilities &
1981              (WPA_CAPABILITY_NO_PAIRWISE | WPA_CAPABILITY_PEERKEY_ENABLED)) !=
1982             WPA_CAPABILITY_PEERKEY_ENABLED) {
1983                 wpa_printf(MSG_INFO, "TDLS: Invalid RSN Capabilities in "
1984                            "TPK M1");
1985                 status = WLAN_STATUS_INVALID_RSN_IE_CAPAB;
1986                 goto error;
1987         }
1988
1989         /* Lifetime */
1990         if (kde.key_lifetime == NULL) {
1991                 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1");
1992                 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1993                 goto error;
1994         }
1995         timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
1996         lifetime = WPA_GET_LE32(timeoutie->value);
1997         wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime);
1998         if (lifetime < 300) {
1999                 wpa_printf(MSG_INFO, "TDLS: Too short TPK lifetime");
2000                 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
2001                 goto error;
2002         }
2003
2004 skip_rsn:
2005 #ifdef CONFIG_TDLS_TESTING
2006         if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
2007                 if (os_memcmp(sm->own_addr, peer->addr, ETH_ALEN) < 0) {
2008                         /*
2009                          * The request frame from us is going to win, so do not
2010                          * replace information based on this request frame from
2011                          * the peer.
2012                          */
2013                         goto skip_rsn_check;
2014                 }
2015         }
2016 #endif /* CONFIG_TDLS_TESTING */
2017
2018         peer->initiator = 0; /* Need to check */
2019         peer->dtoken = dtoken;
2020
2021         if (!wpa_tdls_get_privacy(sm)) {
2022                 peer->rsnie_i_len = 0;
2023                 peer->rsnie_p_len = 0;
2024                 peer->cipher = WPA_CIPHER_NONE;
2025                 goto skip_rsn_check;
2026         }
2027
2028         ftie = (struct wpa_tdls_ftie *) kde.ftie;
2029         os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
2030         peer->rsnie_i_len = kde.rsn_ie_len;
2031         peer->cipher = cipher;
2032
2033         if (os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) != 0 ||
2034             !tdls_nonce_set(peer->inonce)) {
2035                 /*
2036                  * There is no point in updating the RNonce for every obtained
2037                  * TPK M1 frame (e.g., retransmission due to timeout) with the
2038                  * same INonce (SNonce in FTIE). However, if the TPK M1 is
2039                  * retransmitted with a different INonce, update the RNonce
2040                  * since this is for a new TDLS session.
2041                  */
2042                 wpa_printf(MSG_DEBUG,
2043                            "TDLS: New TPK M1 INonce - generate new RNonce");
2044                 os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN);
2045                 if (os_get_random(peer->rnonce, WPA_NONCE_LEN)) {
2046                         wpa_msg(sm->ctx->ctx, MSG_WARNING,
2047                                 "TDLS: Failed to get random data for responder nonce");
2048                         goto error;
2049                 }
2050                 peer->tk_set = 0; /* A new nonce results in a new TK */
2051         }
2052
2053 #if 0
2054         /* get version info from RSNIE received from Peer */
2055         hdr = (struct rsn_ie_hdr *) kde.rsn_ie;
2056         rsn_ver = WPA_GET_LE16(hdr->version);
2057
2058         /* use min(peer's version, out version) */
2059         if (rsn_ver > RSN_VERSION)
2060                 rsn_ver = RSN_VERSION;
2061
2062         hdr = (struct rsn_ie_hdr *) peer->rsnie_p;
2063
2064         hdr->elem_id = WLAN_EID_RSN;
2065         WPA_PUT_LE16(hdr->version, rsn_ver);
2066         pos = (u8 *) (hdr + 1);
2067
2068         RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
2069         pos += RSN_SELECTOR_LEN;
2070         /* Include only the selected cipher in pairwise cipher suite */
2071         WPA_PUT_LE16(pos, 1);
2072         pos += 2;
2073         if (cipher == WPA_CIPHER_CCMP)
2074                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
2075         pos += RSN_SELECTOR_LEN;
2076
2077         WPA_PUT_LE16(pos, 1);
2078         pos += 2;
2079         RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
2080         pos += RSN_SELECTOR_LEN;
2081
2082         rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
2083         rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
2084         WPA_PUT_LE16(pos, rsn_capab);
2085         pos += 2;
2086
2087         hdr->len = (pos - peer->rsnie_p) - 2;
2088         peer->rsnie_p_len = pos - peer->rsnie_p;
2089 #endif
2090
2091         /* temp fix: validation of RSNIE later */
2092         os_memcpy(peer->rsnie_p, peer->rsnie_i, peer->rsnie_i_len);
2093         peer->rsnie_p_len = peer->rsnie_i_len;
2094
2095         wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
2096                     peer->rsnie_p, peer->rsnie_p_len);
2097
2098         peer->lifetime = lifetime;
2099
2100         wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
2101
2102 skip_rsn_check:
2103 #ifdef CONFIG_TDLS_TESTING
2104         if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT)
2105                 goto skip_add_peer;
2106 #endif /* CONFIG_TDLS_TESTING */
2107
2108         /* add supported rates, capabilities, and qos_info to the TDLS peer */
2109         if (wpa_tdls_addset_peer(sm, peer, 1) < 0)
2110                 goto error;
2111
2112 #ifdef CONFIG_TDLS_TESTING
2113 skip_add_peer:
2114 #endif /* CONFIG_TDLS_TESTING */
2115         peer->tpk_in_progress = 1;
2116
2117         wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Response / TPK M2");
2118         if (wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer) < 0) {
2119                 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2120                 goto error;
2121         }
2122
2123         return 0;
2124
2125 error:
2126         wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0,
2127                             status);
2128         if (peer)
2129                 wpa_tdls_peer_free(sm, peer);
2130         return -1;
2131 }
2132
2133
2134 static int wpa_tdls_enable_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
2135 {
2136         peer->tpk_success = 1;
2137         peer->tpk_in_progress = 0;
2138         eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
2139         if (wpa_tdls_get_privacy(sm)) {
2140                 u32 lifetime = peer->lifetime;
2141                 /*
2142                  * Start the initiator process a bit earlier to avoid race
2143                  * condition with the responder sending teardown request.
2144                  */
2145                 if (lifetime > 3 && peer->initiator)
2146                         lifetime -= 3;
2147                 eloop_register_timeout(lifetime, 0, wpa_tdls_tpk_timeout,
2148                                        sm, peer);
2149 #ifdef CONFIG_TDLS_TESTING
2150         if (tdls_testing & TDLS_TESTING_NO_TPK_EXPIRATION) {
2151                 wpa_printf(MSG_DEBUG, "TDLS: Testing - disable TPK "
2152                            "expiration");
2153                 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
2154         }
2155 #endif /* CONFIG_TDLS_TESTING */
2156         }
2157
2158         if (peer->reconfig_key && wpa_tdls_set_key(sm, peer) < 0) {
2159                 wpa_printf(MSG_INFO, "TDLS: Could not configure key to the "
2160                            "driver");
2161                 return -1;
2162         }
2163         peer->reconfig_key = 0;
2164
2165         return wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, peer->addr);
2166 }
2167
2168
2169 static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
2170                                    const u8 *buf, size_t len)
2171 {
2172         struct wpa_tdls_peer *peer;
2173         struct wpa_eapol_ie_parse kde;
2174         struct wpa_ie_data ie;
2175         int cipher;
2176         struct wpa_tdls_ftie *ftie;
2177         struct wpa_tdls_timeoutie *timeoutie;
2178         struct wpa_tdls_lnkid *lnkid;
2179         u32 lifetime;
2180         u8 dtoken;
2181         int ielen;
2182         u16 status;
2183         const u8 *pos;
2184         int ret = 0;
2185
2186         wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Response / TPK M2 "
2187                    "(Peer " MACSTR ")", MAC2STR(src_addr));
2188         for (peer = sm->tdls; peer; peer = peer->next) {
2189                 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
2190                         break;
2191         }
2192         if (peer == NULL) {
2193                 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
2194                            "TPK M2: " MACSTR, MAC2STR(src_addr));
2195                 return -1;
2196         }
2197         if (!peer->initiator) {
2198                 /*
2199                  * This may happen if both devices try to initiate TDLS at the
2200                  * same time and we accept the TPK M1 from the peer in
2201                  * wpa_tdls_process_tpk_m1() and clear our previous state.
2202                  */
2203                 wpa_printf(MSG_INFO, "TDLS: We were not the initiator, so "
2204                            "ignore TPK M2 from " MACSTR, MAC2STR(src_addr));
2205                 return -1;
2206         }
2207
2208         if (peer->tpk_success) {
2209                 wpa_printf(MSG_INFO, "TDLS: Ignore incoming TPK M2 retry, from "
2210                            MACSTR " as TPK M3 was already sent",
2211                            MAC2STR(src_addr));
2212                 return 0;
2213         }
2214
2215         wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_REQUEST);
2216
2217         if (len < 3 + 2 + 1) {
2218                 wpa_tdls_disable_peer_link(sm, peer);
2219                 return -1;
2220         }
2221
2222         pos = buf;
2223         pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
2224         status = WPA_GET_LE16(pos);
2225         pos += 2 /* status code */;
2226
2227         if (status != WLAN_STATUS_SUCCESS) {
2228                 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M2: %u",
2229                            status);
2230                 wpa_tdls_disable_peer_link(sm, peer);
2231                 return -1;
2232         }
2233
2234         status = WLAN_STATUS_UNSPECIFIED_FAILURE;
2235
2236         /* TODO: need to verify dialog token matches here or in kernel */
2237         dtoken = *pos++; /* dialog token */
2238
2239         wpa_printf(MSG_DEBUG, "TDLS: Dialog Token in TPK M2 %d", dtoken);
2240
2241         if (len < 3 + 2 + 1 + 2) {
2242                 wpa_tdls_disable_peer_link(sm, peer);
2243                 return -1;
2244         }
2245
2246         /* capability information */
2247         peer->capability = WPA_GET_LE16(pos);
2248         pos += 2;
2249
2250         ielen = len - (pos - buf); /* start of IE in buf */
2251
2252         /*
2253          * Don't reject the message if failing to parse IEs. The IEs we need are
2254          * explicitly checked below. Some APs may add arbitrary padding to the
2255          * end of short TDLS frames and that would look like invalid IEs.
2256          */
2257         if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0)
2258                 wpa_printf(MSG_DEBUG,
2259                            "TDLS: Failed to parse IEs in TPK M2 - ignore as an interop workaround");
2260
2261 #ifdef CONFIG_TDLS_TESTING
2262         if (tdls_testing & TDLS_TESTING_DECLINE_RESP) {
2263                 wpa_printf(MSG_DEBUG, "TDLS: Testing - decline response");
2264                 status = WLAN_STATUS_REQUEST_DECLINED;
2265                 goto error;
2266         }
2267 #endif /* CONFIG_TDLS_TESTING */
2268
2269         if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
2270                 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
2271                            "TPK M2");
2272                 goto error;
2273         }
2274         wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M2",
2275                     kde.lnkid, kde.lnkid_len);
2276         lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
2277
2278         if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
2279                 wpa_printf(MSG_INFO, "TDLS: TPK M2 from different BSS");
2280                 status = WLAN_STATUS_NOT_IN_SAME_BSS;
2281                 goto error;
2282         }
2283
2284         if (copy_supp_rates(&kde, peer) < 0)
2285                 goto error;
2286
2287         if (copy_peer_ht_capab(&kde, peer) < 0)
2288                 goto error;
2289
2290         if (copy_peer_vht_capab(&kde, peer) < 0)
2291                 goto error;
2292
2293         if (copy_peer_ext_capab(&kde, peer) < 0)
2294                 goto error;
2295
2296         if (copy_peer_supp_channels(&kde, peer) < 0)
2297                 goto error;
2298
2299         if (copy_peer_supp_oper_classes(&kde, peer) < 0)
2300                 goto error;
2301
2302         peer->qos_info = kde.qosinfo;
2303
2304         /* Overwrite with the qos_info obtained in WMM IE */
2305         if (copy_peer_wmm_capab(&kde, peer) < 0)
2306                 goto error;
2307
2308         peer->aid = kde.aid;
2309
2310         if (!wpa_tdls_get_privacy(sm)) {
2311                 peer->rsnie_p_len = 0;
2312                 peer->cipher = WPA_CIPHER_NONE;
2313                 goto skip_rsn;
2314         }
2315
2316         if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
2317             kde.rsn_ie == NULL) {
2318                 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M2");
2319                 status = WLAN_STATUS_INVALID_PARAMETERS;
2320                 goto error;
2321         }
2322         wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
2323                     kde.rsn_ie, kde.rsn_ie_len);
2324
2325         if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
2326                 wpa_printf(MSG_INFO,
2327                            "TDLS: Too long Responder RSN IE in TPK M2");
2328                 status = WLAN_STATUS_INVALID_RSNIE;
2329                 goto error;
2330         }
2331
2332         /*
2333          * FIX: bitwise comparison of RSN IE is not the correct way of
2334          * validation this. It can be different, but certain fields must
2335          * match. Since we list only a single pairwise cipher in TPK M1, the
2336          * memcmp is likely to work in most cases, though.
2337          */
2338         if (kde.rsn_ie_len != peer->rsnie_i_len ||
2339             os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) != 0) {
2340                 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M2 does "
2341                            "not match with RSN IE used in TPK M1");
2342                 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Sent in TPK M1",
2343                             peer->rsnie_i, peer->rsnie_i_len);
2344                 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
2345                             kde.rsn_ie, kde.rsn_ie_len);
2346                 status = WLAN_STATUS_INVALID_RSNIE;
2347                 goto error;
2348         }
2349
2350         if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
2351                 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M2");
2352                 status = WLAN_STATUS_INVALID_RSNIE;
2353                 goto error;
2354         }
2355
2356         cipher = ie.pairwise_cipher;
2357         if (cipher == WPA_CIPHER_CCMP) {
2358                 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
2359                 cipher = WPA_CIPHER_CCMP;
2360         } else {
2361                 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M2");
2362                 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
2363                 goto error;
2364         }
2365
2366         wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M2",
2367                     kde.ftie, sizeof(*ftie));
2368         ftie = (struct wpa_tdls_ftie *) kde.ftie;
2369
2370         if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
2371                 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does "
2372                            "not match with FTIE SNonce used in TPK M1");
2373                 /* Silently discard the frame */
2374                 return -1;
2375         }
2376
2377         /* Responder Nonce and RSN IE */
2378         os_memcpy(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN);
2379         os_memcpy(peer->rsnie_p, kde.rsn_ie, kde.rsn_ie_len);
2380         peer->rsnie_p_len = kde.rsn_ie_len;
2381         peer->cipher = cipher;
2382
2383         /* Lifetime */
2384         if (kde.key_lifetime == NULL) {
2385                 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M2");
2386                 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
2387                 goto error;
2388         }
2389         timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
2390         lifetime = WPA_GET_LE32(timeoutie->value);
2391         wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M2",
2392                    lifetime);
2393         if (lifetime != peer->lifetime) {
2394                 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
2395                            "TPK M2 (expected %u)", lifetime, peer->lifetime);
2396                 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
2397                 goto error;
2398         }
2399
2400         wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
2401
2402         /* Process MIC check to see if TPK M2 is right */
2403         if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid,
2404                                            (u8 *) timeoutie, ftie) < 0) {
2405                 /* Discard the frame */
2406                 wpa_tdls_del_key(sm, peer);
2407                 wpa_tdls_disable_peer_link(sm, peer);
2408                 return -1;
2409         }
2410
2411         if (wpa_tdls_set_key(sm, peer) < 0) {
2412                 /*
2413                  * Some drivers may not be able to config the key prior to full
2414                  * STA entry having been configured.
2415                  */
2416                 wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after "
2417                            "STA entry is complete");
2418                 peer->reconfig_key = 1;
2419         }
2420
2421 skip_rsn:
2422         peer->dtoken = dtoken;
2423
2424         /* add supported rates, capabilities, and qos_info to the TDLS peer */
2425         if (wpa_tdls_addset_peer(sm, peer, 0) < 0)
2426                 goto error;
2427
2428         wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Confirm / "
2429                    "TPK Handshake Message 3");
2430         if (wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer) < 0)
2431                 goto error;
2432
2433         if (!peer->tpk_success) {
2434                 /*
2435                  * Enable Link only when tpk_success is 0, signifying that this
2436                  * processing of TPK M2 frame is not because of a retransmission
2437                  * during TDLS setup handshake.
2438                  */
2439                 ret = wpa_tdls_enable_link(sm, peer);
2440                 if (ret < 0) {
2441                         wpa_printf(MSG_DEBUG, "TDLS: Could not enable link");
2442                         wpa_tdls_do_teardown(
2443                                 sm, peer,
2444                                 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
2445                 }
2446         }
2447         return ret;
2448
2449 error:
2450         wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 1,
2451                             status);
2452         wpa_tdls_disable_peer_link(sm, peer);
2453         return -1;
2454 }
2455
2456
2457 static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr,
2458                                    const u8 *buf, size_t len)
2459 {
2460         struct wpa_tdls_peer *peer;
2461         struct wpa_eapol_ie_parse kde;
2462         struct wpa_tdls_ftie *ftie;
2463         struct wpa_tdls_timeoutie *timeoutie;
2464         struct wpa_tdls_lnkid *lnkid;
2465         int ielen;
2466         u16 status;
2467         const u8 *pos;
2468         u32 lifetime;
2469         int ret = 0;
2470
2471         wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Confirm / TPK M3 "
2472                    "(Peer " MACSTR ")", MAC2STR(src_addr));
2473         for (peer = sm->tdls; peer; peer = peer->next) {
2474                 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
2475                         break;
2476         }
2477         if (peer == NULL) {
2478                 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
2479                            "TPK M3: " MACSTR, MAC2STR(src_addr));
2480                 return -1;
2481         }
2482         wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_RESPONSE);
2483
2484         if (len < 3 + 3)
2485                 goto error;
2486         pos = buf;
2487         pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
2488
2489         status = WPA_GET_LE16(pos);
2490
2491         if (status != 0) {
2492                 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M3: %u",
2493                            status);
2494                 goto error;
2495         }
2496         pos += 2 /* status code */ + 1 /* dialog token */;
2497
2498         ielen = len - (pos - buf); /* start of IE in buf */
2499
2500         /*
2501          * Don't reject the message if failing to parse IEs. The IEs we need are
2502          * explicitly checked below. Some APs piggy-back broken IEs to the end
2503          * of a TDLS Confirm packet, which will fail the link if we don't ignore
2504          * this error.
2505          */
2506         if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) {
2507                 wpa_printf(MSG_DEBUG,
2508                            "TDLS: Failed to parse KDEs in TPK M3 - ignore as an interop workaround");
2509         }
2510
2511         if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
2512                 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M3");
2513                 goto error;
2514         }
2515         wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M3",
2516                     (u8 *) kde.lnkid, kde.lnkid_len);
2517         lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
2518
2519         if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
2520                 wpa_printf(MSG_INFO, "TDLS: TPK M3 from diff BSS");
2521                 goto error;
2522         }
2523
2524         if (!wpa_tdls_get_privacy(sm))
2525                 goto skip_rsn;
2526
2527         if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
2528                 wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M3");
2529                 goto error;
2530         }
2531         wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M3",
2532                     kde.ftie, sizeof(*ftie));
2533         ftie = (struct wpa_tdls_ftie *) kde.ftie;
2534
2535         if (kde.rsn_ie == NULL) {
2536                 wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M3");
2537                 goto error;
2538         }
2539         wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M3",
2540                     kde.rsn_ie, kde.rsn_ie_len);
2541         if (kde.rsn_ie_len != peer->rsnie_p_len ||
2542             os_memcmp(kde.rsn_ie, peer->rsnie_p, peer->rsnie_p_len) != 0) {
2543                 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M3 does not match "
2544                            "with the one sent in TPK M2");
2545                 goto error;
2546         }
2547
2548         if (!os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) {
2549                 wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does "
2550                            "not match with FTIE ANonce used in TPK M2");
2551                 goto error;
2552         }
2553
2554         if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
2555                 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M3 does not "
2556                            "match with FTIE SNonce used in TPK M1");
2557                 goto error;
2558         }
2559
2560         if (kde.key_lifetime == NULL) {
2561                 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M3");
2562                 goto error;
2563         }
2564         timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
2565         wpa_hexdump(MSG_DEBUG, "TDLS: Timeout IE Received from TPK M3",
2566                     (u8 *) timeoutie, sizeof(*timeoutie));
2567         lifetime = WPA_GET_LE32(timeoutie->value);
2568         wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M3",
2569                    lifetime);
2570         if (lifetime != peer->lifetime) {
2571                 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
2572                            "TPK M3 (expected %u)", lifetime, peer->lifetime);
2573                 goto error;
2574         }
2575
2576         if (wpa_supplicant_verify_tdls_mic(3, peer, (u8 *) lnkid,
2577                                            (u8 *) timeoutie, ftie) < 0) {
2578                 wpa_tdls_del_key(sm, peer);
2579                 goto error;
2580         }
2581
2582         if (wpa_tdls_set_key(sm, peer) < 0) {
2583                 /*
2584                  * Some drivers may not be able to config the key prior to full
2585                  * STA entry having been configured.
2586                  */
2587                 wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after "
2588                            "STA entry is complete");
2589                 peer->reconfig_key = 1;
2590         }
2591
2592 skip_rsn:
2593         /* add supported rates, capabilities, and qos_info to the TDLS peer */
2594         if (wpa_tdls_addset_peer(sm, peer, 0) < 0)
2595                 goto error;
2596
2597         if (!peer->tpk_success) {
2598                 /*
2599                  * Enable Link only when tpk_success is 0, signifying that this
2600                  * processing of TPK M3 frame is not because of a retransmission
2601                  * during TDLS setup handshake.
2602                  */
2603                 ret = wpa_tdls_enable_link(sm, peer);
2604                 if (ret < 0) {
2605                         wpa_printf(MSG_DEBUG, "TDLS: Could not enable link");
2606                         goto error;
2607                 }
2608         }
2609         return ret;
2610 error:
2611         wpa_tdls_do_teardown(sm, peer, WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
2612         return -1;
2613 }
2614
2615
2616 static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs)
2617 {
2618         struct wpa_tdls_timeoutie *lifetime = (struct wpa_tdls_timeoutie *) ie;
2619
2620         os_memset(lifetime, 0, ie_len);
2621         lifetime->ie_type = WLAN_EID_TIMEOUT_INTERVAL;
2622         lifetime->ie_len = sizeof(struct wpa_tdls_timeoutie) - 2;
2623         lifetime->interval_type = WLAN_TIMEOUT_KEY_LIFETIME;
2624         WPA_PUT_LE32(lifetime->value, tsecs);
2625         os_memcpy(pos, ie, ie_len);
2626         return pos + ie_len;
2627 }
2628
2629
2630 /**
2631  * wpa_tdls_start - Initiate TDLS handshake (send TPK Handshake Message 1)
2632  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2633  * @peer: MAC address of the peer STA
2634  * Returns: 0 on success, or -1 on failure
2635  *
2636  * Send TPK Handshake Message 1 info to driver to start TDLS
2637  * handshake with the peer.
2638  */
2639 int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr)
2640 {
2641         struct wpa_tdls_peer *peer;
2642         int tdls_prohibited = sm->tdls_prohibited;
2643
2644         if (sm->tdls_disabled || !sm->tdls_supported)
2645                 return -1;
2646
2647 #ifdef CONFIG_TDLS_TESTING
2648         if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
2649             tdls_prohibited) {
2650                 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
2651                            "on TDLS");
2652                 tdls_prohibited = 0;
2653         }
2654 #endif /* CONFIG_TDLS_TESTING */
2655
2656         if (tdls_prohibited) {
2657                 wpa_printf(MSG_DEBUG, "TDLS: TDLS is prohibited in this BSS - "
2658                            "reject request to start setup");
2659                 return -1;
2660         }
2661
2662         peer = wpa_tdls_add_peer(sm, addr, NULL);
2663         if (peer == NULL)
2664                 return -1;
2665
2666         if (peer->tpk_in_progress) {
2667                 wpa_printf(MSG_DEBUG, "TDLS: Setup is already in progress with the peer");
2668                 return 0;
2669         }
2670
2671         peer->initiator = 1;
2672
2673         /* add the peer to the driver as a "setup in progress" peer */
2674         if (wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL,
2675                                     NULL, 0, 0, NULL, 0, NULL, 0, NULL, 0)) {
2676                 wpa_tdls_disable_peer_link(sm, peer);
2677                 return -1;
2678         }
2679
2680         peer->tpk_in_progress = 1;
2681
2682         if (wpa_tdls_send_tpk_m1(sm, peer) < 0) {
2683                 wpa_tdls_disable_peer_link(sm, peer);
2684                 return -1;
2685         }
2686
2687         return 0;
2688 }
2689
2690
2691 void wpa_tdls_remove(struct wpa_sm *sm, const u8 *addr)
2692 {
2693         struct wpa_tdls_peer *peer;
2694
2695         if (sm->tdls_disabled || !sm->tdls_supported)
2696                 return;
2697
2698         for (peer = sm->tdls; peer; peer = peer->next) {
2699                 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
2700                         break;
2701         }
2702
2703         if (peer == NULL || !peer->tpk_success)
2704                 return;
2705
2706         if (sm->tdls_external_setup) {
2707                 /*
2708                  * Disable previous link to allow renegotiation to be completed
2709                  * on AP path.
2710                  */
2711                 wpa_tdls_do_teardown(sm, peer,
2712                                      WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
2713         }
2714 }
2715
2716
2717 /**
2718  * wpa_supplicant_rx_tdls - Receive TDLS data frame
2719  *
2720  * This function is called to receive TDLS (ethertype = 0x890d) data frames.
2721  */
2722 static void wpa_supplicant_rx_tdls(void *ctx, const u8 *src_addr,
2723                                    const u8 *buf, size_t len)
2724 {
2725         struct wpa_sm *sm = ctx;
2726         struct wpa_tdls_frame *tf;
2727
2728         wpa_hexdump(MSG_DEBUG, "TDLS: Received Data frame encapsulation",
2729                     buf, len);
2730
2731         if (sm->tdls_disabled || !sm->tdls_supported) {
2732                 wpa_printf(MSG_DEBUG, "TDLS: Discard message - TDLS disabled "
2733                            "or unsupported by driver");
2734                 return;
2735         }
2736
2737         if (os_memcmp(src_addr, sm->own_addr, ETH_ALEN) == 0) {
2738                 wpa_printf(MSG_DEBUG, "TDLS: Discard copy of own message");
2739                 return;
2740         }
2741
2742         if (len < sizeof(*tf)) {
2743                 wpa_printf(MSG_INFO, "TDLS: Drop too short frame");
2744                 return;
2745         }
2746
2747         /* Check to make sure its a valid encapsulated TDLS frame */
2748         tf = (struct wpa_tdls_frame *) buf;
2749         if (tf->payloadtype != 2 /* TDLS_RFTYPE */ ||
2750             tf->category != WLAN_ACTION_TDLS) {
2751                 wpa_printf(MSG_INFO, "TDLS: Invalid frame - payloadtype=%u "
2752                            "category=%u action=%u",
2753                            tf->payloadtype, tf->category, tf->action);
2754                 return;
2755         }
2756
2757         switch (tf->action) {
2758         case WLAN_TDLS_SETUP_REQUEST:
2759                 wpa_tdls_process_tpk_m1(sm, src_addr, buf, len);
2760                 break;
2761         case WLAN_TDLS_SETUP_RESPONSE:
2762                 wpa_tdls_process_tpk_m2(sm, src_addr, buf, len);
2763                 break;
2764         case WLAN_TDLS_SETUP_CONFIRM:
2765                 wpa_tdls_process_tpk_m3(sm, src_addr, buf, len);
2766                 break;
2767         case WLAN_TDLS_TEARDOWN:
2768                 wpa_tdls_recv_teardown(sm, src_addr, buf, len);
2769                 break;
2770         case WLAN_TDLS_DISCOVERY_REQUEST:
2771                 wpa_tdls_process_discovery_request(sm, src_addr, buf, len);
2772                 break;
2773         default:
2774                 /* Kernel code will process remaining frames */
2775                 wpa_printf(MSG_DEBUG, "TDLS: Ignore TDLS frame action code %u",
2776                            tf->action);
2777                 break;
2778         }
2779 }
2780
2781
2782 /**
2783  * wpa_tdls_init - Initialize driver interface parameters for TDLS
2784  * @wpa_s: Pointer to wpa_supplicant data
2785  * Returns: 0 on success, -1 on failure
2786  *
2787  * This function is called to initialize driver interface parameters for TDLS.
2788  * wpa_drv_init() must have been called before this function to initialize the
2789  * driver interface.
2790  */
2791 int wpa_tdls_init(struct wpa_sm *sm)
2792 {
2793         if (sm == NULL)
2794                 return -1;
2795
2796         sm->l2_tdls = l2_packet_init(sm->bridge_ifname ? sm->bridge_ifname :
2797                                      sm->ifname,
2798                                      sm->own_addr,
2799                                      ETH_P_80211_ENCAP, wpa_supplicant_rx_tdls,
2800                                      sm, 0);
2801         if (sm->l2_tdls == NULL) {
2802                 wpa_printf(MSG_ERROR, "TDLS: Failed to open l2_packet "
2803                            "connection");
2804                 return -1;
2805         }
2806
2807         /*
2808          * Drivers that support TDLS but don't implement the get_capa callback
2809          * are assumed to perform everything internally
2810          */
2811         if (wpa_sm_tdls_get_capa(sm, &sm->tdls_supported,
2812                                  &sm->tdls_external_setup,
2813                                  &sm->tdls_chan_switch) < 0) {
2814                 sm->tdls_supported = 1;
2815                 sm->tdls_external_setup = 0;
2816         }
2817
2818         wpa_printf(MSG_DEBUG, "TDLS: TDLS operation%s supported by "
2819                    "driver", sm->tdls_supported ? "" : " not");
2820         wpa_printf(MSG_DEBUG, "TDLS: Driver uses %s link setup",
2821                    sm->tdls_external_setup ? "external" : "internal");
2822         wpa_printf(MSG_DEBUG, "TDLS: Driver %s TDLS channel switching",
2823                    sm->tdls_chan_switch ? "supports" : "does not support");
2824
2825         return 0;
2826 }
2827
2828
2829 void wpa_tdls_teardown_peers(struct wpa_sm *sm)
2830 {
2831         struct wpa_tdls_peer *peer, *tmp;
2832
2833         if (!sm)
2834                 return;
2835         peer = sm->tdls;
2836
2837         wpa_printf(MSG_DEBUG, "TDLS: Tear down peers");
2838
2839         while (peer) {
2840                 tmp = peer->next;
2841                 wpa_printf(MSG_DEBUG, "TDLS: Tear down peer " MACSTR,
2842                            MAC2STR(peer->addr));
2843                 if (sm->tdls_external_setup)
2844                         wpa_tdls_do_teardown(sm, peer,
2845                                              WLAN_REASON_DEAUTH_LEAVING);
2846                 else
2847                         wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr);
2848
2849                 peer = tmp;
2850         }
2851 }
2852
2853
2854 static void wpa_tdls_remove_peers(struct wpa_sm *sm)
2855 {
2856         struct wpa_tdls_peer *peer, *tmp;
2857
2858         peer = sm->tdls;
2859
2860         while (peer) {
2861                 int res;
2862                 tmp = peer->next;
2863                 res = wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2864                 wpa_printf(MSG_DEBUG, "TDLS: Remove peer " MACSTR " (res=%d)",
2865                            MAC2STR(peer->addr), res);
2866                 wpa_tdls_peer_free(sm, peer);
2867                 peer = tmp;
2868         }
2869 }
2870
2871
2872 /**
2873  * wpa_tdls_deinit - Deinitialize driver interface parameters for TDLS
2874  *
2875  * This function is called to recover driver interface parameters for TDLS
2876  * and frees resources allocated for it.
2877  */
2878 void wpa_tdls_deinit(struct wpa_sm *sm)
2879 {
2880         if (sm == NULL)
2881                 return;
2882
2883         if (sm->l2_tdls)
2884                 l2_packet_deinit(sm->l2_tdls);
2885         sm->l2_tdls = NULL;
2886
2887         wpa_tdls_remove_peers(sm);
2888 }
2889
2890
2891 void wpa_tdls_assoc(struct wpa_sm *sm)
2892 {
2893         wpa_printf(MSG_DEBUG, "TDLS: Remove peers on association");
2894         wpa_tdls_remove_peers(sm);
2895 }
2896
2897
2898 void wpa_tdls_disassoc(struct wpa_sm *sm)
2899 {
2900         wpa_printf(MSG_DEBUG, "TDLS: Remove peers on disassociation");
2901         wpa_tdls_remove_peers(sm);
2902 }
2903
2904
2905 static int wpa_tdls_prohibited(struct ieee802_11_elems *elems)
2906 {
2907         /* bit 38 - TDLS Prohibited */
2908         return !!(elems->ext_capab[2 + 4] & 0x40);
2909 }
2910
2911
2912 static int wpa_tdls_chan_switch_prohibited(struct ieee802_11_elems *elems)
2913 {
2914         /* bit 39 - TDLS Channel Switch Prohibited */
2915         return !!(elems->ext_capab[2 + 4] & 0x80);
2916 }
2917
2918
2919 void wpa_tdls_ap_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2920 {
2921         struct ieee802_11_elems elems;
2922
2923         sm->tdls_prohibited = 0;
2924         sm->tdls_chan_switch_prohibited = 0;
2925
2926         if (ies == NULL ||
2927             ieee802_11_parse_elems(ies, len, &elems, 0) == ParseFailed ||
2928             elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5)
2929                 return;
2930
2931         sm->tdls_prohibited = wpa_tdls_prohibited(&elems);
2932         wpa_printf(MSG_DEBUG, "TDLS: TDLS is %s in the target BSS",
2933                    sm->tdls_prohibited ? "prohibited" : "allowed");
2934         sm->tdls_chan_switch_prohibited =
2935                 wpa_tdls_chan_switch_prohibited(&elems);
2936         wpa_printf(MSG_DEBUG, "TDLS: TDLS channel switch %s in the target BSS",
2937                    sm->tdls_chan_switch_prohibited ? "prohibited" : "allowed");
2938 }
2939
2940
2941 void wpa_tdls_assoc_resp_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2942 {
2943         struct ieee802_11_elems elems;
2944
2945         if (ies == NULL ||
2946             ieee802_11_parse_elems(ies, len, &elems, 0) == ParseFailed ||
2947             elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5)
2948                 return;
2949
2950         if (!sm->tdls_prohibited && wpa_tdls_prohibited(&elems)) {
2951                 wpa_printf(MSG_DEBUG, "TDLS: TDLS prohibited based on "
2952                            "(Re)Association Response IEs");
2953                 sm->tdls_prohibited = 1;
2954         }
2955
2956         if (!sm->tdls_chan_switch_prohibited &&
2957             wpa_tdls_chan_switch_prohibited(&elems)) {
2958                 wpa_printf(MSG_DEBUG,
2959                            "TDLS: TDLS channel switch prohibited based on (Re)Association Response IEs");
2960                 sm->tdls_chan_switch_prohibited = 1;
2961         }
2962 }
2963
2964
2965 void wpa_tdls_enable(struct wpa_sm *sm, int enabled)
2966 {
2967         wpa_printf(MSG_DEBUG, "TDLS: %s", enabled ? "enabled" : "disabled");
2968         sm->tdls_disabled = !enabled;
2969 }
2970
2971
2972 int wpa_tdls_is_external_setup(struct wpa_sm *sm)
2973 {
2974         return sm->tdls_external_setup;
2975 }
2976
2977
2978 int wpa_tdls_enable_chan_switch(struct wpa_sm *sm, const u8 *addr,
2979                                 u8 oper_class,
2980                                 struct hostapd_freq_params *freq_params)
2981 {
2982         struct wpa_tdls_peer *peer;
2983         int ret;
2984
2985         if (sm->tdls_disabled || !sm->tdls_supported)
2986                 return -1;
2987
2988         if (!sm->tdls_chan_switch) {
2989                 wpa_printf(MSG_DEBUG,
2990                            "TDLS: Channel switching not supported by the driver");
2991                 return -1;
2992         }
2993
2994         if (sm->tdls_chan_switch_prohibited) {
2995                 wpa_printf(MSG_DEBUG,
2996                            "TDLS: Channel switching is prohibited in this BSS - reject request to switch channel");
2997                 return -1;
2998         }
2999
3000         for (peer = sm->tdls; peer; peer = peer->next) {
3001                 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
3002                         break;
3003         }
3004
3005         if (peer == NULL || !peer->tpk_success) {
3006                 wpa_printf(MSG_ERROR, "TDLS: Peer " MACSTR
3007                            " not found for channel switching", MAC2STR(addr));
3008                 return -1;
3009         }
3010
3011         if (peer->chan_switch_enabled) {
3012                 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR
3013                            " already has channel switching enabled",
3014                            MAC2STR(addr));
3015                 return 0;
3016         }
3017
3018         ret = wpa_sm_tdls_enable_channel_switch(sm, peer->addr,
3019                                                 oper_class, freq_params);
3020         if (!ret)
3021                 peer->chan_switch_enabled = 1;
3022
3023         return ret;
3024 }
3025
3026
3027 int wpa_tdls_disable_chan_switch(struct wpa_sm *sm, const u8 *addr)
3028 {
3029         struct wpa_tdls_peer *peer;
3030
3031         if (sm->tdls_disabled || !sm->tdls_supported)
3032                 return -1;
3033
3034         for (peer = sm->tdls; peer; peer = peer->next) {
3035                 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
3036                         break;
3037         }
3038
3039         if (!peer || !peer->chan_switch_enabled) {
3040                 wpa_printf(MSG_ERROR, "TDLS: Channel switching not enabled for "
3041                            MACSTR, MAC2STR(addr));
3042                 return -1;
3043         }
3044
3045         /* ignore the return value */
3046         wpa_sm_tdls_disable_channel_switch(sm, peer->addr);
3047
3048         peer->chan_switch_enabled = 0;
3049         return 0;
3050 }