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