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