tdls.c revision 700a137ab366edc72e371da68ba187b4717ee660
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) 36unsigned int tdls_testing = 0; 37#endif /* CONFIG_TDLS_TESTING */ 38 39#define TPK_LIFETIME 43200 /* 12 hours */ 40#define TPK_RETRY_COUNT 3 41#define TPK_TIMEOUT 5000 /* in milliseconds */ 42 43#define TDLS_MIC_LEN 16 44 45#define TDLS_TIMEOUT_LEN 4 46 47struct wpa_tdls_ftie { 48 u8 ie_type; /* FTIE */ 49 u8 ie_len; 50 u8 mic_ctrl[2]; 51 u8 mic[TDLS_MIC_LEN]; 52 u8 Anonce[WPA_NONCE_LEN]; /* Responder Nonce in TDLS */ 53 u8 Snonce[WPA_NONCE_LEN]; /* Initiator Nonce in TDLS */ 54 /* followed by optional elements */ 55} STRUCT_PACKED; 56 57struct wpa_tdls_timeoutie { 58 u8 ie_type; /* Timeout IE */ 59 u8 ie_len; 60 u8 interval_type; 61 u8 value[TDLS_TIMEOUT_LEN]; 62} STRUCT_PACKED; 63 64struct wpa_tdls_lnkid { 65 u8 ie_type; /* Link Identifier IE */ 66 u8 ie_len; 67 u8 bssid[ETH_ALEN]; 68 u8 init_sta[ETH_ALEN]; 69 u8 resp_sta[ETH_ALEN]; 70} STRUCT_PACKED; 71 72/* TDLS frame headers as per IEEE Std 802.11z-2010 */ 73struct wpa_tdls_frame { 74 u8 payloadtype; /* IEEE80211_TDLS_RFTYPE */ 75 u8 category; /* Category */ 76 u8 action; /* Action (enum tdls_frame_type) */ 77} STRUCT_PACKED; 78 79static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs); 80static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx); 81static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer); 82 83 84#define TDLS_MAX_IE_LEN 80 85#define IEEE80211_MAX_SUPP_RATES 32 86 87struct wpa_tdls_peer { 88 struct wpa_tdls_peer *next; 89 int initiator; /* whether this end was initiator for TDLS setup */ 90 u8 addr[ETH_ALEN]; /* other end MAC address */ 91 u8 inonce[WPA_NONCE_LEN]; /* Initiator Nonce */ 92 u8 rnonce[WPA_NONCE_LEN]; /* Responder Nonce */ 93 u8 rsnie_i[TDLS_MAX_IE_LEN]; /* Initiator RSN IE */ 94 size_t rsnie_i_len; 95 u8 rsnie_p[TDLS_MAX_IE_LEN]; /* Peer RSN IE */ 96 size_t rsnie_p_len; 97 u32 lifetime; 98 int cipher; /* Selected cipher (WPA_CIPHER_*) */ 99 u8 dtoken; 100 101 struct tpk { 102 u8 kck[16]; /* TPK-KCK */ 103 u8 tk[16]; /* TPK-TK; assuming only CCMP will be used */ 104 } tpk; 105 int tpk_set; 106 int tpk_success; 107 108 struct tpk_timer { 109 u8 dest[ETH_ALEN]; 110 int count; /* Retry Count */ 111 int timer; /* Timeout in milliseconds */ 112 u8 action_code; /* TDLS frame type */ 113 u8 dialog_token; 114 u16 status_code; 115 int buf_len; /* length of TPK message for retransmission */ 116 u8 *buf; /* buffer for TPK message */ 117 } sm_tmr; 118 119 u16 capability; 120 121 u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; 122 size_t supp_rates_len; 123 124 struct ieee80211_ht_capabilities *ht_capabilities; 125 struct ieee80211_vht_capabilities *vht_capabilities; 126 127 u8 qos_info; 128 129 u8 *ext_capab; 130 size_t ext_capab_len; 131}; 132 133 134static int wpa_tdls_get_privacy(struct wpa_sm *sm) 135{ 136 /* 137 * Get info needed from supplicant to check if the current BSS supports 138 * security. Other than OPEN mode, rest are considered secured 139 * WEP/WPA/WPA2 hence TDLS frames are processed for TPK handshake. 140 */ 141 return sm->pairwise_cipher != WPA_CIPHER_NONE; 142} 143 144 145static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len) 146{ 147 os_memcpy(pos, ie, ie_len); 148 return pos + ie_len; 149} 150 151 152static int wpa_tdls_del_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 153{ 154 if (wpa_sm_set_key(sm, WPA_ALG_NONE, peer->addr, 155 0, 0, NULL, 0, NULL, 0) < 0) { 156 wpa_printf(MSG_WARNING, "TDLS: Failed to delete TPK-TK from " 157 "the driver"); 158 return -1; 159 } 160 161 return 0; 162} 163 164 165static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 166{ 167 u8 key_len; 168 u8 rsc[6]; 169 enum wpa_alg alg; 170 171 os_memset(rsc, 0, 6); 172 173 switch (peer->cipher) { 174 case WPA_CIPHER_CCMP: 175 alg = WPA_ALG_CCMP; 176 key_len = 16; 177 break; 178 case WPA_CIPHER_NONE: 179 wpa_printf(MSG_DEBUG, "TDLS: Pairwise Cipher Suite: " 180 "NONE - do not use pairwise keys"); 181 return -1; 182 default: 183 wpa_printf(MSG_WARNING, "TDLS: Unsupported pairwise cipher %d", 184 sm->pairwise_cipher); 185 return -1; 186 } 187 188 if (wpa_sm_set_key(sm, alg, peer->addr, -1, 1, 189 rsc, sizeof(rsc), peer->tpk.tk, key_len) < 0) { 190 wpa_printf(MSG_WARNING, "TDLS: Failed to set TPK to the " 191 "driver"); 192 return -1; 193 } 194 return 0; 195} 196 197 198static int wpa_tdls_send_tpk_msg(struct wpa_sm *sm, const u8 *dst, 199 u8 action_code, u8 dialog_token, 200 u16 status_code, const u8 *buf, size_t len) 201{ 202 return wpa_sm_send_tdls_mgmt(sm, dst, action_code, dialog_token, 203 status_code, buf, len); 204} 205 206 207static int wpa_tdls_tpk_send(struct wpa_sm *sm, const u8 *dest, u8 action_code, 208 u8 dialog_token, u16 status_code, 209 const u8 *msg, size_t msg_len) 210{ 211 struct wpa_tdls_peer *peer; 212 213 wpa_printf(MSG_DEBUG, "TDLS: TPK send dest=" MACSTR " action_code=%u " 214 "dialog_token=%u status_code=%u msg_len=%u", 215 MAC2STR(dest), action_code, dialog_token, status_code, 216 (unsigned int) msg_len); 217 218 if (wpa_tdls_send_tpk_msg(sm, dest, action_code, dialog_token, 219 status_code, msg, msg_len)) { 220 wpa_printf(MSG_INFO, "TDLS: Failed to send message " 221 "(action_code=%u)", action_code); 222 return -1; 223 } 224 225 if (action_code == WLAN_TDLS_SETUP_CONFIRM || 226 action_code == WLAN_TDLS_TEARDOWN || 227 action_code == WLAN_TDLS_DISCOVERY_REQUEST || 228 action_code == WLAN_TDLS_DISCOVERY_RESPONSE) 229 return 0; /* No retries */ 230 231 for (peer = sm->tdls; peer; peer = peer->next) { 232 if (os_memcmp(peer->addr, dest, ETH_ALEN) == 0) 233 break; 234 } 235 236 if (peer == NULL) { 237 wpa_printf(MSG_INFO, "TDLS: No matching entry found for " 238 "retry " MACSTR, MAC2STR(dest)); 239 return 0; 240 } 241 242 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 243 244 peer->sm_tmr.count = TPK_RETRY_COUNT; 245 peer->sm_tmr.timer = TPK_TIMEOUT; 246 247 /* Copy message to resend on timeout */ 248 os_memcpy(peer->sm_tmr.dest, dest, ETH_ALEN); 249 peer->sm_tmr.action_code = action_code; 250 peer->sm_tmr.dialog_token = dialog_token; 251 peer->sm_tmr.status_code = status_code; 252 peer->sm_tmr.buf_len = msg_len; 253 os_free(peer->sm_tmr.buf); 254 peer->sm_tmr.buf = os_malloc(msg_len); 255 if (peer->sm_tmr.buf == NULL) 256 return -1; 257 os_memcpy(peer->sm_tmr.buf, msg, msg_len); 258 259 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout registered " 260 "(action_code=%u)", action_code); 261 eloop_register_timeout(peer->sm_tmr.timer / 1000, 0, 262 wpa_tdls_tpk_retry_timeout, sm, peer); 263 return 0; 264} 265 266 267static int wpa_tdls_do_teardown(struct wpa_sm *sm, struct wpa_tdls_peer *peer, 268 u16 reason_code, int free_peer) 269{ 270 int ret; 271 272 if (sm->tdls_external_setup) { 273 ret = wpa_tdls_send_teardown(sm, peer->addr, reason_code); 274 275 /* disable the link after teardown was sent */ 276 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); 277 } else { 278 ret = wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr); 279 } 280 281 if (sm->tdls_external_setup || free_peer) 282 wpa_tdls_peer_free(sm, peer); 283 284 return ret; 285} 286 287 288static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx) 289{ 290 291 struct wpa_sm *sm = eloop_ctx; 292 struct wpa_tdls_peer *peer = timeout_ctx; 293 294 if (peer->sm_tmr.count) { 295 peer->sm_tmr.count--; 296 peer->sm_tmr.timer = TPK_TIMEOUT; 297 298 wpa_printf(MSG_INFO, "TDLS: Retrying sending of message " 299 "(action_code=%u)", 300 peer->sm_tmr.action_code); 301 302 if (peer->sm_tmr.buf == NULL) { 303 wpa_printf(MSG_INFO, "TDLS: No retry buffer available " 304 "for action_code=%u", 305 peer->sm_tmr.action_code); 306 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, 307 peer); 308 return; 309 } 310 311 /* resend TPK Handshake Message to Peer */ 312 if (wpa_tdls_send_tpk_msg(sm, peer->sm_tmr.dest, 313 peer->sm_tmr.action_code, 314 peer->sm_tmr.dialog_token, 315 peer->sm_tmr.status_code, 316 peer->sm_tmr.buf, 317 peer->sm_tmr.buf_len)) { 318 wpa_printf(MSG_INFO, "TDLS: Failed to retry " 319 "transmission"); 320 } 321 322 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 323 eloop_register_timeout(peer->sm_tmr.timer / 1000, 0, 324 wpa_tdls_tpk_retry_timeout, sm, peer); 325 } else { 326 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 327 328 wpa_printf(MSG_DEBUG, "TDLS: Sending Teardown Request"); 329 wpa_tdls_do_teardown(sm, peer, 330 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1); 331 } 332} 333 334 335static void wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm *sm, 336 struct wpa_tdls_peer *peer, 337 u8 action_code) 338{ 339 if (action_code == peer->sm_tmr.action_code) { 340 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout cancelled for " 341 "action_code=%u", action_code); 342 343 /* Cancel Timeout registered */ 344 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 345 346 /* free all resources meant for retry */ 347 os_free(peer->sm_tmr.buf); 348 peer->sm_tmr.buf = NULL; 349 350 peer->sm_tmr.count = 0; 351 peer->sm_tmr.timer = 0; 352 peer->sm_tmr.buf_len = 0; 353 peer->sm_tmr.action_code = 0xff; 354 } else { 355 wpa_printf(MSG_INFO, "TDLS: Error in cancelling retry timeout " 356 "(Unknown action_code=%u)", action_code); 357 } 358} 359 360 361static void wpa_tdls_generate_tpk(struct wpa_tdls_peer *peer, 362 const u8 *own_addr, const u8 *bssid) 363{ 364 u8 key_input[SHA256_MAC_LEN]; 365 const u8 *nonce[2]; 366 size_t len[2]; 367 u8 data[3 * ETH_ALEN]; 368 369 /* IEEE Std 802.11z-2010 8.5.9.1: 370 * TPK-Key-Input = SHA-256(min(SNonce, ANonce) || max(SNonce, ANonce)) 371 */ 372 len[0] = WPA_NONCE_LEN; 373 len[1] = WPA_NONCE_LEN; 374 if (os_memcmp(peer->inonce, peer->rnonce, WPA_NONCE_LEN) < 0) { 375 nonce[0] = peer->inonce; 376 nonce[1] = peer->rnonce; 377 } else { 378 nonce[0] = peer->rnonce; 379 nonce[1] = peer->inonce; 380 } 381 wpa_hexdump(MSG_DEBUG, "TDLS: min(Nonce)", nonce[0], WPA_NONCE_LEN); 382 wpa_hexdump(MSG_DEBUG, "TDLS: max(Nonce)", nonce[1], WPA_NONCE_LEN); 383 sha256_vector(2, nonce, len, key_input); 384 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-Key-Input", 385 key_input, SHA256_MAC_LEN); 386 387 /* 388 * TPK-Key-Data = KDF-N_KEY(TPK-Key-Input, "TDLS PMK", 389 * min(MAC_I, MAC_R) || max(MAC_I, MAC_R) || BSSID || N_KEY) 390 * TODO: is N_KEY really included in KDF Context and if so, in which 391 * presentation format (little endian 16-bit?) is it used? It gets 392 * added by the KDF anyway.. 393 */ 394 395 if (os_memcmp(own_addr, peer->addr, ETH_ALEN) < 0) { 396 os_memcpy(data, own_addr, ETH_ALEN); 397 os_memcpy(data + ETH_ALEN, peer->addr, ETH_ALEN); 398 } else { 399 os_memcpy(data, peer->addr, ETH_ALEN); 400 os_memcpy(data + ETH_ALEN, own_addr, ETH_ALEN); 401 } 402 os_memcpy(data + 2 * ETH_ALEN, bssid, ETH_ALEN); 403 wpa_hexdump(MSG_DEBUG, "TDLS: KDF Context", data, sizeof(data)); 404 405 sha256_prf(key_input, SHA256_MAC_LEN, "TDLS PMK", data, sizeof(data), 406 (u8 *) &peer->tpk, sizeof(peer->tpk)); 407 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-KCK", 408 peer->tpk.kck, sizeof(peer->tpk.kck)); 409 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-TK", 410 peer->tpk.tk, sizeof(peer->tpk.tk)); 411 peer->tpk_set = 1; 412} 413 414 415/** 416 * wpa_tdls_ftie_mic - Calculate TDLS FTIE MIC 417 * @kck: TPK-KCK 418 * @lnkid: Pointer to the beginning of Link Identifier IE 419 * @rsnie: Pointer to the beginning of RSN IE used for handshake 420 * @timeoutie: Pointer to the beginning of Timeout IE used for handshake 421 * @ftie: Pointer to the beginning of FT IE 422 * @mic: Pointer for writing MIC 423 * 424 * Calculate MIC for TDLS frame. 425 */ 426static int wpa_tdls_ftie_mic(const u8 *kck, u8 trans_seq, const u8 *lnkid, 427 const u8 *rsnie, const u8 *timeoutie, 428 const u8 *ftie, u8 *mic) 429{ 430 u8 *buf, *pos; 431 struct wpa_tdls_ftie *_ftie; 432 const struct wpa_tdls_lnkid *_lnkid; 433 int ret; 434 int len = 2 * ETH_ALEN + 1 + 2 + lnkid[1] + 2 + rsnie[1] + 435 2 + timeoutie[1] + 2 + ftie[1]; 436 buf = os_zalloc(len); 437 if (!buf) { 438 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation"); 439 return -1; 440 } 441 442 pos = buf; 443 _lnkid = (const struct wpa_tdls_lnkid *) lnkid; 444 /* 1) TDLS initiator STA MAC address */ 445 os_memcpy(pos, _lnkid->init_sta, ETH_ALEN); 446 pos += ETH_ALEN; 447 /* 2) TDLS responder STA MAC address */ 448 os_memcpy(pos, _lnkid->resp_sta, ETH_ALEN); 449 pos += ETH_ALEN; 450 /* 3) Transaction Sequence number */ 451 *pos++ = trans_seq; 452 /* 4) Link Identifier IE */ 453 os_memcpy(pos, lnkid, 2 + lnkid[1]); 454 pos += 2 + lnkid[1]; 455 /* 5) RSN IE */ 456 os_memcpy(pos, rsnie, 2 + rsnie[1]); 457 pos += 2 + rsnie[1]; 458 /* 6) Timeout Interval IE */ 459 os_memcpy(pos, timeoutie, 2 + timeoutie[1]); 460 pos += 2 + timeoutie[1]; 461 /* 7) FTIE, with the MIC field of the FTIE set to 0 */ 462 os_memcpy(pos, ftie, 2 + ftie[1]); 463 _ftie = (struct wpa_tdls_ftie *) pos; 464 os_memset(_ftie->mic, 0, TDLS_MIC_LEN); 465 pos += 2 + ftie[1]; 466 467 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf); 468 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16); 469 ret = omac1_aes_128(kck, buf, pos - buf, mic); 470 os_free(buf); 471 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16); 472 return ret; 473} 474 475 476/** 477 * wpa_tdls_key_mic_teardown - Calculate TDLS FTIE MIC for Teardown frame 478 * @kck: TPK-KCK 479 * @trans_seq: Transaction Sequence Number (4 - Teardown) 480 * @rcode: Reason code for Teardown 481 * @dtoken: Dialog Token used for that particular link 482 * @lnkid: Pointer to the beginning of Link Identifier IE 483 * @ftie: Pointer to the beginning of FT IE 484 * @mic: Pointer for writing MIC 485 * 486 * Calculate MIC for TDLS frame. 487 */ 488static int wpa_tdls_key_mic_teardown(const u8 *kck, u8 trans_seq, u16 rcode, 489 u8 dtoken, const u8 *lnkid, 490 const u8 *ftie, u8 *mic) 491{ 492 u8 *buf, *pos; 493 struct wpa_tdls_ftie *_ftie; 494 int ret; 495 int len; 496 497 if (lnkid == NULL) 498 return -1; 499 500 len = 2 + lnkid[1] + sizeof(rcode) + sizeof(dtoken) + 501 sizeof(trans_seq) + 2 + ftie[1]; 502 503 buf = os_zalloc(len); 504 if (!buf) { 505 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation"); 506 return -1; 507 } 508 509 pos = buf; 510 /* 1) Link Identifier IE */ 511 os_memcpy(pos, lnkid, 2 + lnkid[1]); 512 pos += 2 + lnkid[1]; 513 /* 2) Reason Code */ 514 WPA_PUT_LE16(pos, rcode); 515 pos += sizeof(rcode); 516 /* 3) Dialog token */ 517 *pos++ = dtoken; 518 /* 4) Transaction Sequence number */ 519 *pos++ = trans_seq; 520 /* 7) FTIE, with the MIC field of the FTIE set to 0 */ 521 os_memcpy(pos, ftie, 2 + ftie[1]); 522 _ftie = (struct wpa_tdls_ftie *) pos; 523 os_memset(_ftie->mic, 0, TDLS_MIC_LEN); 524 pos += 2 + ftie[1]; 525 526 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf); 527 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16); 528 ret = omac1_aes_128(kck, buf, pos - buf, mic); 529 os_free(buf); 530 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16); 531 return ret; 532} 533 534 535static int wpa_supplicant_verify_tdls_mic(u8 trans_seq, 536 struct wpa_tdls_peer *peer, 537 const u8 *lnkid, const u8 *timeoutie, 538 const struct wpa_tdls_ftie *ftie) 539{ 540 u8 mic[16]; 541 542 if (peer->tpk_set) { 543 wpa_tdls_ftie_mic(peer->tpk.kck, trans_seq, lnkid, 544 peer->rsnie_p, timeoutie, (u8 *) ftie, 545 mic); 546 if (os_memcmp(mic, ftie->mic, 16) != 0) { 547 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in FTIE - " 548 "dropping packet"); 549 wpa_hexdump(MSG_DEBUG, "TDLS: Received MIC", 550 ftie->mic, 16); 551 wpa_hexdump(MSG_DEBUG, "TDLS: Calculated MIC", 552 mic, 16); 553 return -1; 554 } 555 } else { 556 wpa_printf(MSG_WARNING, "TDLS: Could not verify TDLS MIC, " 557 "TPK not set - dropping packet"); 558 return -1; 559 } 560 return 0; 561} 562 563 564static int wpa_supplicant_verify_tdls_mic_teardown( 565 u8 trans_seq, u16 rcode, u8 dtoken, struct wpa_tdls_peer *peer, 566 const u8 *lnkid, const struct wpa_tdls_ftie *ftie) 567{ 568 u8 mic[16]; 569 570 if (peer->tpk_set) { 571 wpa_tdls_key_mic_teardown(peer->tpk.kck, trans_seq, rcode, 572 dtoken, lnkid, (u8 *) ftie, mic); 573 if (os_memcmp(mic, ftie->mic, 16) != 0) { 574 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in Teardown - " 575 "dropping packet"); 576 return -1; 577 } 578 } else { 579 wpa_printf(MSG_INFO, "TDLS: Could not verify TDLS Teardown " 580 "MIC, TPK not set - dropping packet"); 581 return -1; 582 } 583 return 0; 584} 585 586 587static void wpa_tdls_tpk_timeout(void *eloop_ctx, void *timeout_ctx) 588{ 589 struct wpa_sm *sm = eloop_ctx; 590 struct wpa_tdls_peer *peer = timeout_ctx; 591 592 /* 593 * On TPK lifetime expiration, we have an option of either tearing down 594 * the direct link or trying to re-initiate it. The selection of what 595 * to do is not strictly speaking controlled by our role in the expired 596 * link, but for now, use that to select whether to renew or tear down 597 * the link. 598 */ 599 600 if (peer->initiator) { 601 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR 602 " - try to renew", MAC2STR(peer->addr)); 603 wpa_tdls_start(sm, peer->addr); 604 } else { 605 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR 606 " - tear down", MAC2STR(peer->addr)); 607 wpa_tdls_do_teardown(sm, peer, 608 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1); 609 } 610} 611 612 613static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 614{ 615 wpa_printf(MSG_DEBUG, "TDLS: Clear state for peer " MACSTR, 616 MAC2STR(peer->addr)); 617 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer); 618 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 619 peer->initiator = 0; 620 os_free(peer->sm_tmr.buf); 621 peer->sm_tmr.buf = NULL; 622 os_free(peer->ht_capabilities); 623 peer->ht_capabilities = NULL; 624 os_free(peer->vht_capabilities); 625 peer->vht_capabilities = NULL; 626 os_free(peer->ext_capab); 627 peer->ext_capab = NULL; 628 peer->rsnie_i_len = peer->rsnie_p_len = 0; 629 peer->cipher = 0; 630 peer->tpk_set = peer->tpk_success = 0; 631 os_memset(&peer->tpk, 0, sizeof(peer->tpk)); 632 os_memset(peer->inonce, 0, WPA_NONCE_LEN); 633 os_memset(peer->rnonce, 0, WPA_NONCE_LEN); 634} 635 636 637static void wpa_tdls_linkid(struct wpa_sm *sm, struct wpa_tdls_peer *peer, 638 struct wpa_tdls_lnkid *lnkid) 639{ 640 lnkid->ie_type = WLAN_EID_LINK_ID; 641 lnkid->ie_len = 3 * ETH_ALEN; 642 os_memcpy(lnkid->bssid, sm->bssid, ETH_ALEN); 643 if (peer->initiator) { 644 os_memcpy(lnkid->init_sta, sm->own_addr, ETH_ALEN); 645 os_memcpy(lnkid->resp_sta, peer->addr, ETH_ALEN); 646 } else { 647 os_memcpy(lnkid->init_sta, peer->addr, ETH_ALEN); 648 os_memcpy(lnkid->resp_sta, sm->own_addr, ETH_ALEN); 649 } 650} 651 652 653int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr, u16 reason_code) 654{ 655 struct wpa_tdls_peer *peer; 656 struct wpa_tdls_ftie *ftie; 657 struct wpa_tdls_lnkid lnkid; 658 u8 dialog_token; 659 u8 *rbuf, *pos; 660 int ielen; 661 662 if (sm->tdls_disabled || !sm->tdls_supported) 663 return -1; 664 665 /* Find the node and free from the list */ 666 for (peer = sm->tdls; peer; peer = peer->next) { 667 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 668 break; 669 } 670 671 if (peer == NULL) { 672 wpa_printf(MSG_INFO, "TDLS: No matching entry found for " 673 "Teardown " MACSTR, MAC2STR(addr)); 674 return 0; 675 } 676 677 dialog_token = peer->dtoken; 678 679 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown for " MACSTR, 680 MAC2STR(addr)); 681 682 ielen = 0; 683 if (wpa_tdls_get_privacy(sm) && peer->tpk_set && peer->tpk_success) { 684 /* To add FTIE for Teardown request and compute MIC */ 685 ielen += sizeof(*ftie); 686#ifdef CONFIG_TDLS_TESTING 687 if (tdls_testing & TDLS_TESTING_LONG_FRAME) 688 ielen += 170; 689#endif /* CONFIG_TDLS_TESTING */ 690 } 691 692 rbuf = os_zalloc(ielen + 1); 693 if (rbuf == NULL) 694 return -1; 695 pos = rbuf; 696 697 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success) { 698 if (reason_code != WLAN_REASON_DEAUTH_LEAVING) { 699 /* Overwrite the reason code */ 700 reason_code = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; 701 } 702 goto skip_ies; 703 } 704 705 ftie = (struct wpa_tdls_ftie *) pos; 706 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; 707 /* Using the recent nonce which should be for CONFIRM frame */ 708 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN); 709 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); 710 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; 711 pos = (u8 *) (ftie + 1); 712#ifdef CONFIG_TDLS_TESTING 713 if (tdls_testing & TDLS_TESTING_LONG_FRAME) { 714 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " 715 "FTIE"); 716 ftie->ie_len += 170; 717 *pos++ = 255; /* FTIE subelem */ 718 *pos++ = 168; /* FTIE subelem length */ 719 pos += 168; 720 } 721#endif /* CONFIG_TDLS_TESTING */ 722 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TDLS Teardown handshake", 723 (u8 *) ftie, pos - (u8 *) ftie); 724 725 /* compute MIC before sending */ 726 wpa_tdls_linkid(sm, peer, &lnkid); 727 wpa_tdls_key_mic_teardown(peer->tpk.kck, 4, reason_code, 728 dialog_token, (u8 *) &lnkid, (u8 *) ftie, 729 ftie->mic); 730 731skip_ies: 732 /* TODO: register for a Timeout handler, if Teardown is not received at 733 * the other end, then try again another time */ 734 735 /* request driver to send Teardown using this FTIE */ 736 wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_TEARDOWN, 0, 737 reason_code, rbuf, pos - rbuf); 738 os_free(rbuf); 739 740 /* clear the Peerkey statemachine */ 741 wpa_tdls_peer_free(sm, peer); 742 743 return 0; 744} 745 746 747int wpa_tdls_teardown_link(struct wpa_sm *sm, const u8 *addr, u16 reason_code) 748{ 749 struct wpa_tdls_peer *peer; 750 751 if (sm->tdls_disabled || !sm->tdls_supported) 752 return -1; 753 754 for (peer = sm->tdls; peer; peer = peer->next) { 755 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 756 break; 757 } 758 759 if (peer == NULL) { 760 wpa_printf(MSG_DEBUG, "TDLS: Could not find peer " MACSTR 761 " for link Teardown", MAC2STR(addr)); 762 return -1; 763 } 764 765 if (!peer->tpk_success) { 766 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR 767 " not connected - cannot Teardown link", MAC2STR(addr)); 768 return -1; 769 } 770 771 return wpa_tdls_do_teardown(sm, peer, reason_code, 0); 772} 773 774 775void wpa_tdls_disable_link(struct wpa_sm *sm, const u8 *addr) 776{ 777 struct wpa_tdls_peer *peer; 778 779 for (peer = sm->tdls; peer; peer = peer->next) { 780 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 781 break; 782 } 783 784 if (peer) { 785 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, addr); 786 wpa_tdls_peer_free(sm, peer); 787 } 788} 789 790 791static int wpa_tdls_recv_teardown(struct wpa_sm *sm, const u8 *src_addr, 792 const u8 *buf, size_t len) 793{ 794 struct wpa_tdls_peer *peer = NULL; 795 struct wpa_tdls_ftie *ftie; 796 struct wpa_tdls_lnkid *lnkid; 797 struct wpa_eapol_ie_parse kde; 798 u16 reason_code; 799 const u8 *pos; 800 int ielen; 801 802 /* Find the node and free from the list */ 803 for (peer = sm->tdls; peer; peer = peer->next) { 804 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) 805 break; 806 } 807 808 if (peer == NULL) { 809 wpa_printf(MSG_INFO, "TDLS: No matching entry found for " 810 "Teardown " MACSTR, MAC2STR(src_addr)); 811 return 0; 812 } 813 814 pos = buf; 815 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; 816 817 reason_code = WPA_GET_LE16(pos); 818 pos += 2; 819 820 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown Request from " MACSTR 821 " (reason code %u)", MAC2STR(src_addr), reason_code); 822 823 ielen = len - (pos - buf); /* start of IE in buf */ 824 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) { 825 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in Teardown"); 826 return -1; 827 } 828 829 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { 830 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TDLS " 831 "Teardown"); 832 return -1; 833 } 834 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; 835 836 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success) 837 goto skip_ftie; 838 839 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) { 840 wpa_printf(MSG_INFO, "TDLS: No FTIE in TDLS Teardown"); 841 return -1; 842 } 843 844 ftie = (struct wpa_tdls_ftie *) kde.ftie; 845 846 /* Process MIC check to see if TDLS Teardown is right */ 847 if (wpa_supplicant_verify_tdls_mic_teardown(4, reason_code, 848 peer->dtoken, peer, 849 (u8 *) lnkid, ftie) < 0) { 850 wpa_printf(MSG_DEBUG, "TDLS: MIC failure for TDLS " 851 "Teardown Request from " MACSTR, MAC2STR(src_addr)); 852 return -1; 853 } 854 855skip_ftie: 856 /* 857 * Request the driver to disable the direct link and clear associated 858 * keys. 859 */ 860 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 861 862 /* clear the Peerkey statemachine */ 863 wpa_tdls_peer_free(sm, peer); 864 865 return 0; 866} 867 868 869/** 870 * wpa_tdls_send_error - To send suitable TDLS status response with 871 * appropriate status code mentioning reason for error/failure. 872 * @dst - MAC addr of Peer station 873 * @tdls_action - TDLS frame type for which error code is sent 874 * @status - status code mentioning reason 875 */ 876 877static int wpa_tdls_send_error(struct wpa_sm *sm, const u8 *dst, 878 u8 tdls_action, u8 dialog_token, u16 status) 879{ 880 wpa_printf(MSG_DEBUG, "TDLS: Sending error to " MACSTR 881 " (action=%u status=%u)", 882 MAC2STR(dst), tdls_action, status); 883 return wpa_tdls_tpk_send(sm, dst, tdls_action, dialog_token, status, 884 NULL, 0); 885} 886 887 888static struct wpa_tdls_peer * 889wpa_tdls_add_peer(struct wpa_sm *sm, const u8 *addr, int *existing) 890{ 891 struct wpa_tdls_peer *peer; 892 893 if (existing) 894 *existing = 0; 895 for (peer = sm->tdls; peer; peer = peer->next) { 896 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) { 897 if (existing) 898 *existing = 1; 899 return peer; /* re-use existing entry */ 900 } 901 } 902 903 wpa_printf(MSG_INFO, "TDLS: Creating peer entry for " MACSTR, 904 MAC2STR(addr)); 905 906 peer = os_zalloc(sizeof(*peer)); 907 if (peer == NULL) 908 return NULL; 909 910 os_memcpy(peer->addr, addr, ETH_ALEN); 911 peer->next = sm->tdls; 912 sm->tdls = peer; 913 914 return peer; 915} 916 917 918static int wpa_tdls_send_tpk_m1(struct wpa_sm *sm, 919 struct wpa_tdls_peer *peer) 920{ 921 size_t buf_len; 922 struct wpa_tdls_timeoutie timeoutie; 923 u16 rsn_capab; 924 struct wpa_tdls_ftie *ftie; 925 u8 *rbuf, *pos, *count_pos; 926 u16 count; 927 struct rsn_ie_hdr *hdr; 928 929 if (!wpa_tdls_get_privacy(sm)) { 930 wpa_printf(MSG_DEBUG, "TDLS: No security used on the link"); 931 peer->rsnie_i_len = 0; 932 goto skip_rsnie; 933 } 934 935 /* 936 * TPK Handshake Message 1: 937 * FTIE: ANonce=0, SNonce=initiator nonce MIC=0, DataKDs=(RSNIE_I, 938 * Timeout Interval IE)) 939 */ 940 941 /* Filling RSN IE */ 942 hdr = (struct rsn_ie_hdr *) peer->rsnie_i; 943 hdr->elem_id = WLAN_EID_RSN; 944 WPA_PUT_LE16(hdr->version, RSN_VERSION); 945 946 pos = (u8 *) (hdr + 1); 947 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED); 948 pos += RSN_SELECTOR_LEN; 949 count_pos = pos; 950 pos += 2; 951 952 count = 0; 953 954 /* 955 * AES-CCMP is the default Encryption preferred for TDLS, so 956 * RSN IE is filled only with CCMP CIPHER 957 * Note: TKIP is not used to encrypt TDLS link. 958 * 959 * Regardless of the cipher used on the AP connection, select CCMP 960 * here. 961 */ 962 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 963 pos += RSN_SELECTOR_LEN; 964 count++; 965 966 WPA_PUT_LE16(count_pos, count); 967 968 WPA_PUT_LE16(pos, 1); 969 pos += 2; 970 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE); 971 pos += RSN_SELECTOR_LEN; 972 973 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; 974 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2; 975#ifdef CONFIG_TDLS_TESTING 976 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) { 977 wpa_printf(MSG_DEBUG, "TDLS: Use alternative RSN IE for " 978 "testing"); 979 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; 980 } 981#endif /* CONFIG_TDLS_TESTING */ 982 WPA_PUT_LE16(pos, rsn_capab); 983 pos += 2; 984#ifdef CONFIG_TDLS_TESTING 985 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) { 986 /* Number of PMKIDs */ 987 *pos++ = 0x00; 988 *pos++ = 0x00; 989 } 990#endif /* CONFIG_TDLS_TESTING */ 991 992 hdr->len = (pos - peer->rsnie_i) - 2; 993 peer->rsnie_i_len = pos - peer->rsnie_i; 994 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake", 995 peer->rsnie_i, peer->rsnie_i_len); 996 997skip_rsnie: 998 buf_len = 0; 999 if (wpa_tdls_get_privacy(sm)) 1000 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) + 1001 sizeof(struct wpa_tdls_timeoutie); 1002#ifdef CONFIG_TDLS_TESTING 1003 if (wpa_tdls_get_privacy(sm) && 1004 (tdls_testing & TDLS_TESTING_LONG_FRAME)) 1005 buf_len += 170; 1006 if (tdls_testing & TDLS_TESTING_DIFF_BSSID) 1007 buf_len += sizeof(struct wpa_tdls_lnkid); 1008#endif /* CONFIG_TDLS_TESTING */ 1009 rbuf = os_zalloc(buf_len + 1); 1010 if (rbuf == NULL) { 1011 wpa_tdls_peer_free(sm, peer); 1012 return -1; 1013 } 1014 pos = rbuf; 1015 1016 if (!wpa_tdls_get_privacy(sm)) 1017 goto skip_ies; 1018 1019 /* Initiator RSN IE */ 1020 pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len); 1021 1022 ftie = (struct wpa_tdls_ftie *) pos; 1023 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; 1024 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; 1025 1026 if (os_get_random(peer->inonce, WPA_NONCE_LEN)) { 1027 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1028 "TDLS: Failed to get random data for initiator Nonce"); 1029 os_free(rbuf); 1030 wpa_tdls_peer_free(sm, peer); 1031 return -1; 1032 } 1033 wpa_hexdump(MSG_DEBUG, "TDLS: Initiator Nonce for TPK handshake", 1034 peer->inonce, WPA_NONCE_LEN); 1035 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); 1036 1037 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK Handshake M1", 1038 (u8 *) ftie, sizeof(struct wpa_tdls_ftie)); 1039 1040 pos = (u8 *) (ftie + 1); 1041 1042#ifdef CONFIG_TDLS_TESTING 1043 if (tdls_testing & TDLS_TESTING_LONG_FRAME) { 1044 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " 1045 "FTIE"); 1046 ftie->ie_len += 170; 1047 *pos++ = 255; /* FTIE subelem */ 1048 *pos++ = 168; /* FTIE subelem length */ 1049 pos += 168; 1050 } 1051#endif /* CONFIG_TDLS_TESTING */ 1052 1053 /* Lifetime */ 1054 peer->lifetime = TPK_LIFETIME; 1055#ifdef CONFIG_TDLS_TESTING 1056 if (tdls_testing & TDLS_TESTING_SHORT_LIFETIME) { 1057 wpa_printf(MSG_DEBUG, "TDLS: Testing - use short TPK " 1058 "lifetime"); 1059 peer->lifetime = 301; 1060 } 1061 if (tdls_testing & TDLS_TESTING_LONG_LIFETIME) { 1062 wpa_printf(MSG_DEBUG, "TDLS: Testing - use long TPK " 1063 "lifetime"); 1064 peer->lifetime = 0xffffffff; 1065 } 1066#endif /* CONFIG_TDLS_TESTING */ 1067 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, 1068 sizeof(timeoutie), peer->lifetime); 1069 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime); 1070 1071skip_ies: 1072 1073#ifdef CONFIG_TDLS_TESTING 1074 if (tdls_testing & TDLS_TESTING_DIFF_BSSID) { 1075 wpa_printf(MSG_DEBUG, "TDLS: Testing - use incorrect BSSID in " 1076 "Link Identifier"); 1077 struct wpa_tdls_lnkid *l = (struct wpa_tdls_lnkid *) pos; 1078 wpa_tdls_linkid(sm, peer, l); 1079 l->bssid[5] ^= 0x01; 1080 pos += sizeof(*l); 1081 } 1082#endif /* CONFIG_TDLS_TESTING */ 1083 1084 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Request / TPK " 1085 "Handshake Message 1 (peer " MACSTR ")", 1086 MAC2STR(peer->addr)); 1087 1088 wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_SETUP_REQUEST, 1, 0, 1089 rbuf, pos - rbuf); 1090 os_free(rbuf); 1091 1092 return 0; 1093} 1094 1095 1096static int wpa_tdls_send_tpk_m2(struct wpa_sm *sm, 1097 const unsigned char *src_addr, u8 dtoken, 1098 struct wpa_tdls_lnkid *lnkid, 1099 const struct wpa_tdls_peer *peer) 1100{ 1101 u8 *rbuf, *pos; 1102 size_t buf_len; 1103 u32 lifetime; 1104 struct wpa_tdls_timeoutie timeoutie; 1105 struct wpa_tdls_ftie *ftie; 1106 1107 buf_len = 0; 1108 if (wpa_tdls_get_privacy(sm)) { 1109 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce), 1110 * Lifetime */ 1111 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) + 1112 sizeof(struct wpa_tdls_timeoutie); 1113#ifdef CONFIG_TDLS_TESTING 1114 if (tdls_testing & TDLS_TESTING_LONG_FRAME) 1115 buf_len += 170; 1116#endif /* CONFIG_TDLS_TESTING */ 1117 } 1118 1119 rbuf = os_zalloc(buf_len + 1); 1120 if (rbuf == NULL) 1121 return -1; 1122 pos = rbuf; 1123 1124 if (!wpa_tdls_get_privacy(sm)) 1125 goto skip_ies; 1126 1127 /* Peer RSN IE */ 1128 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len); 1129 1130 ftie = (struct wpa_tdls_ftie *) pos; 1131 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; 1132 /* TODO: ftie->mic_control to set 2-RESPONSE */ 1133 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN); 1134 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); 1135 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; 1136 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK M2", 1137 (u8 *) ftie, sizeof(*ftie)); 1138 1139 pos = (u8 *) (ftie + 1); 1140 1141#ifdef CONFIG_TDLS_TESTING 1142 if (tdls_testing & TDLS_TESTING_LONG_FRAME) { 1143 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " 1144 "FTIE"); 1145 ftie->ie_len += 170; 1146 *pos++ = 255; /* FTIE subelem */ 1147 *pos++ = 168; /* FTIE subelem length */ 1148 pos += 168; 1149 } 1150#endif /* CONFIG_TDLS_TESTING */ 1151 1152 /* Lifetime */ 1153 lifetime = peer->lifetime; 1154#ifdef CONFIG_TDLS_TESTING 1155 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_RESP) { 1156 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK " 1157 "lifetime in response"); 1158 lifetime++; 1159 } 1160#endif /* CONFIG_TDLS_TESTING */ 1161 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, 1162 sizeof(timeoutie), lifetime); 1163 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds from initiator", 1164 lifetime); 1165 1166 /* compute MIC before sending */ 1167 wpa_tdls_ftie_mic(peer->tpk.kck, 2, (u8 *) lnkid, peer->rsnie_p, 1168 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic); 1169 1170skip_ies: 1171 wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0, 1172 rbuf, pos - rbuf); 1173 os_free(rbuf); 1174 1175 return 0; 1176} 1177 1178 1179static int wpa_tdls_send_tpk_m3(struct wpa_sm *sm, 1180 const unsigned char *src_addr, u8 dtoken, 1181 struct wpa_tdls_lnkid *lnkid, 1182 const struct wpa_tdls_peer *peer) 1183{ 1184 u8 *rbuf, *pos; 1185 size_t buf_len; 1186 struct wpa_tdls_ftie *ftie; 1187 struct wpa_tdls_timeoutie timeoutie; 1188 u32 lifetime; 1189 1190 buf_len = 0; 1191 if (wpa_tdls_get_privacy(sm)) { 1192 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce), 1193 * Lifetime */ 1194 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) + 1195 sizeof(struct wpa_tdls_timeoutie); 1196#ifdef CONFIG_TDLS_TESTING 1197 if (tdls_testing & TDLS_TESTING_LONG_FRAME) 1198 buf_len += 170; 1199#endif /* CONFIG_TDLS_TESTING */ 1200 } 1201 1202 rbuf = os_zalloc(buf_len + 1); 1203 if (rbuf == NULL) 1204 return -1; 1205 pos = rbuf; 1206 1207 if (!wpa_tdls_get_privacy(sm)) 1208 goto skip_ies; 1209 1210 /* Peer RSN IE */ 1211 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len); 1212 1213 ftie = (struct wpa_tdls_ftie *) pos; 1214 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; 1215 /*TODO: ftie->mic_control to set 3-CONFIRM */ 1216 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN); 1217 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); 1218 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; 1219 1220 pos = (u8 *) (ftie + 1); 1221 1222#ifdef CONFIG_TDLS_TESTING 1223 if (tdls_testing & TDLS_TESTING_LONG_FRAME) { 1224 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " 1225 "FTIE"); 1226 ftie->ie_len += 170; 1227 *pos++ = 255; /* FTIE subelem */ 1228 *pos++ = 168; /* FTIE subelem length */ 1229 pos += 168; 1230 } 1231#endif /* CONFIG_TDLS_TESTING */ 1232 1233 /* Lifetime */ 1234 lifetime = peer->lifetime; 1235#ifdef CONFIG_TDLS_TESTING 1236 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_CONF) { 1237 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK " 1238 "lifetime in confirm"); 1239 lifetime++; 1240 } 1241#endif /* CONFIG_TDLS_TESTING */ 1242 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, 1243 sizeof(timeoutie), lifetime); 1244 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", 1245 lifetime); 1246 1247 /* compute MIC before sending */ 1248 wpa_tdls_ftie_mic(peer->tpk.kck, 3, (u8 *) lnkid, peer->rsnie_p, 1249 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic); 1250 1251skip_ies: 1252 wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 0, 1253 rbuf, pos - rbuf); 1254 os_free(rbuf); 1255 1256 return 0; 1257} 1258 1259 1260static int wpa_tdls_send_discovery_response(struct wpa_sm *sm, 1261 struct wpa_tdls_peer *peer, 1262 u8 dialog_token) 1263{ 1264 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Discovery Response " 1265 "(peer " MACSTR ")", MAC2STR(peer->addr)); 1266 1267 return wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_DISCOVERY_RESPONSE, 1268 dialog_token, 0, NULL, 0); 1269} 1270 1271 1272static int 1273wpa_tdls_process_discovery_request(struct wpa_sm *sm, const u8 *addr, 1274 const u8 *buf, size_t len) 1275{ 1276 struct wpa_eapol_ie_parse kde; 1277 const struct wpa_tdls_lnkid *lnkid; 1278 struct wpa_tdls_peer *peer; 1279 size_t min_req_len = sizeof(struct wpa_tdls_frame) + 1280 1 /* dialog token */ + sizeof(struct wpa_tdls_lnkid); 1281 u8 dialog_token; 1282 1283 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from " MACSTR, 1284 MAC2STR(addr)); 1285 1286 if (len < min_req_len) { 1287 wpa_printf(MSG_DEBUG, "TDLS Discovery Request is too short: " 1288 "%d", (int) len); 1289 return -1; 1290 } 1291 1292 dialog_token = buf[sizeof(struct wpa_tdls_frame)]; 1293 1294 if (wpa_supplicant_parse_ies(buf + sizeof(struct wpa_tdls_frame) + 1, 1295 len - (sizeof(struct wpa_tdls_frame) + 1), 1296 &kde) < 0) 1297 return -1; 1298 1299 if (!kde.lnkid) { 1300 wpa_printf(MSG_DEBUG, "TDLS: Link ID not found in Discovery " 1301 "Request"); 1302 return -1; 1303 } 1304 1305 lnkid = (const struct wpa_tdls_lnkid *) kde.lnkid; 1306 1307 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { 1308 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from different " 1309 " BSS " MACSTR, MAC2STR(lnkid->bssid)); 1310 return -1; 1311 } 1312 1313 peer = wpa_tdls_add_peer(sm, addr, NULL); 1314 if (peer == NULL) 1315 return -1; 1316 1317 return wpa_tdls_send_discovery_response(sm, peer, dialog_token); 1318} 1319 1320 1321int wpa_tdls_send_discovery_request(struct wpa_sm *sm, const u8 *addr) 1322{ 1323 if (sm->tdls_disabled || !sm->tdls_supported) 1324 return -1; 1325 1326 wpa_printf(MSG_DEBUG, "TDLS: Sending Discovery Request to peer " 1327 MACSTR, MAC2STR(addr)); 1328 return wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_DISCOVERY_REQUEST, 1329 1, 0, NULL, 0); 1330} 1331 1332 1333static int copy_supp_rates(const struct wpa_eapol_ie_parse *kde, 1334 struct wpa_tdls_peer *peer) 1335{ 1336 if (!kde->supp_rates) { 1337 wpa_printf(MSG_DEBUG, "TDLS: No supported rates received"); 1338 return -1; 1339 } 1340 peer->supp_rates_len = merge_byte_arrays( 1341 peer->supp_rates, sizeof(peer->supp_rates), 1342 kde->supp_rates + 2, kde->supp_rates_len - 2, 1343 kde->ext_supp_rates + 2, kde->ext_supp_rates_len - 2); 1344 return 0; 1345} 1346 1347 1348static int copy_peer_ht_capab(const struct wpa_eapol_ie_parse *kde, 1349 struct wpa_tdls_peer *peer) 1350{ 1351 if (!kde->ht_capabilities || 1352 kde->ht_capabilities_len < 1353 sizeof(struct ieee80211_ht_capabilities) ) { 1354 wpa_printf(MSG_DEBUG, "TDLS: No supported ht capabilities " 1355 "received"); 1356 return 0; 1357 } 1358 1359 if (!peer->ht_capabilities) { 1360 peer->ht_capabilities = 1361 os_zalloc(sizeof(struct ieee80211_ht_capabilities)); 1362 if (peer->ht_capabilities == NULL) 1363 return -1; 1364 } 1365 1366 os_memcpy(peer->ht_capabilities, kde->ht_capabilities, 1367 sizeof(struct ieee80211_ht_capabilities)); 1368 wpa_hexdump(MSG_DEBUG, "TDLS: Peer HT capabilities", 1369 (u8 *) peer->ht_capabilities, 1370 sizeof(struct ieee80211_ht_capabilities)); 1371 1372 return 0; 1373} 1374 1375 1376static int copy_peer_vht_capab(const struct wpa_eapol_ie_parse *kde, 1377 struct wpa_tdls_peer *peer) 1378{ 1379 if (!kde->vht_capabilities || 1380 kde->vht_capabilities_len < 1381 sizeof(struct ieee80211_vht_capabilities) ) { 1382 wpa_printf(MSG_DEBUG, "TDLS: No supported vht capabilities " 1383 "received"); 1384 return 0; 1385 } 1386 1387 if (!peer->vht_capabilities) { 1388 peer->vht_capabilities = 1389 os_zalloc(sizeof(struct ieee80211_vht_capabilities)); 1390 if (peer->vht_capabilities == NULL) 1391 return -1; 1392 } 1393 1394 os_memcpy(peer->vht_capabilities, kde->vht_capabilities, 1395 sizeof(struct ieee80211_vht_capabilities)); 1396 wpa_hexdump(MSG_DEBUG, "TDLS: Peer VHT capabilities", 1397 (u8 *) peer->vht_capabilities, 1398 sizeof(struct ieee80211_vht_capabilities)); 1399 1400 return 0; 1401} 1402 1403 1404static int copy_peer_ext_capab(const struct wpa_eapol_ie_parse *kde, 1405 struct wpa_tdls_peer *peer) 1406{ 1407 if (!kde->ext_capab) { 1408 wpa_printf(MSG_DEBUG, "TDLS: No extended capabilities " 1409 "received"); 1410 return 0; 1411 } 1412 1413 if (!peer->ext_capab || peer->ext_capab_len < kde->ext_capab_len - 2) { 1414 /* Need to allocate buffer to fit the new information */ 1415 os_free(peer->ext_capab); 1416 peer->ext_capab = os_zalloc(kde->ext_capab_len - 2); 1417 if (peer->ext_capab == NULL) 1418 return -1; 1419 } 1420 1421 peer->ext_capab_len = kde->ext_capab_len - 2; 1422 os_memcpy(peer->ext_capab, kde->ext_capab + 2, peer->ext_capab_len); 1423 1424 return 0; 1425} 1426 1427 1428static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr, 1429 const u8 *buf, size_t len) 1430{ 1431 struct wpa_tdls_peer *peer; 1432 struct wpa_eapol_ie_parse kde; 1433 struct wpa_ie_data ie; 1434 int cipher; 1435 const u8 *cpos; 1436 struct wpa_tdls_ftie *ftie = NULL; 1437 struct wpa_tdls_timeoutie *timeoutie; 1438 struct wpa_tdls_lnkid *lnkid; 1439 u32 lifetime = 0; 1440#if 0 1441 struct rsn_ie_hdr *hdr; 1442 u8 *pos; 1443 u16 rsn_capab; 1444 u16 rsn_ver; 1445#endif 1446 u8 dtoken; 1447 u16 ielen; 1448 u16 status = WLAN_STATUS_UNSPECIFIED_FAILURE; 1449 int tdls_prohibited = sm->tdls_prohibited; 1450 int existing_peer = 0; 1451 1452 if (len < 3 + 3) 1453 return -1; 1454 1455 cpos = buf; 1456 cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; 1457 1458 /* driver had already verified the frame format */ 1459 dtoken = *cpos++; /* dialog token */ 1460 1461 wpa_printf(MSG_INFO, "TDLS: Dialog Token in TPK M1 %d", dtoken); 1462 1463 peer = wpa_tdls_add_peer(sm, src_addr, &existing_peer); 1464 if (peer == NULL) 1465 goto error; 1466 1467 /* capability information */ 1468 peer->capability = WPA_GET_LE16(cpos); 1469 cpos += 2; 1470 1471 ielen = len - (cpos - buf); /* start of IE in buf */ 1472 if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0) { 1473 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M1"); 1474 goto error; 1475 } 1476 1477 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { 1478 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in " 1479 "TPK M1"); 1480 goto error; 1481 } 1482 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M1", 1483 kde.lnkid, kde.lnkid_len); 1484 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; 1485 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { 1486 wpa_printf(MSG_INFO, "TDLS: TPK M1 from diff BSS"); 1487 status = WLAN_STATUS_NOT_IN_SAME_BSS; 1488 goto error; 1489 } 1490 1491 wpa_printf(MSG_DEBUG, "TDLS: TPK M1 - TPK initiator " MACSTR, 1492 MAC2STR(src_addr)); 1493 1494 if (copy_supp_rates(&kde, peer) < 0) 1495 goto error; 1496 1497 if (copy_peer_ht_capab(&kde, peer) < 0) 1498 goto error; 1499 1500 if (copy_peer_vht_capab(&kde, peer) < 0) 1501 goto error; 1502 1503 if (copy_peer_ext_capab(&kde, peer) < 0) 1504 goto error; 1505 1506 peer->qos_info = kde.qosinfo; 1507 1508#ifdef CONFIG_TDLS_TESTING 1509 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) { 1510 peer = wpa_tdls_add_peer(sm, src_addr, NULL); 1511 if (peer == NULL) 1512 goto error; 1513 wpa_printf(MSG_DEBUG, "TDLS: Testing concurrent initiation of " 1514 "TDLS setup - send own request"); 1515 peer->initiator = 1; 1516 wpa_tdls_send_tpk_m1(sm, peer); 1517 } 1518 1519 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) && 1520 tdls_prohibited) { 1521 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition " 1522 "on TDLS"); 1523 tdls_prohibited = 0; 1524 } 1525#endif /* CONFIG_TDLS_TESTING */ 1526 1527 if (tdls_prohibited) { 1528 wpa_printf(MSG_INFO, "TDLS: TDLS prohibited in this BSS"); 1529 status = WLAN_STATUS_REQUEST_DECLINED; 1530 goto error; 1531 } 1532 1533 if (!wpa_tdls_get_privacy(sm)) { 1534 if (kde.rsn_ie) { 1535 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M1 while " 1536 "security is disabled"); 1537 status = WLAN_STATUS_SECURITY_DISABLED; 1538 goto error; 1539 } 1540 goto skip_rsn; 1541 } 1542 1543 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) || 1544 kde.rsn_ie == NULL) { 1545 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M1"); 1546 status = WLAN_STATUS_INVALID_PARAMETERS; 1547 goto error; 1548 } 1549 1550 if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) { 1551 wpa_printf(MSG_INFO, "TDLS: Too long Initiator RSN IE in " 1552 "TPK M1"); 1553 status = WLAN_STATUS_INVALID_RSNIE; 1554 goto error; 1555 } 1556 1557 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) { 1558 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M1"); 1559 status = WLAN_STATUS_INVALID_RSNIE; 1560 goto error; 1561 } 1562 1563 cipher = ie.pairwise_cipher; 1564 if (cipher & WPA_CIPHER_CCMP) { 1565 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link"); 1566 cipher = WPA_CIPHER_CCMP; 1567 } else { 1568 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M1"); 1569 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID; 1570 goto error; 1571 } 1572 1573 if ((ie.capabilities & 1574 (WPA_CAPABILITY_NO_PAIRWISE | WPA_CAPABILITY_PEERKEY_ENABLED)) != 1575 WPA_CAPABILITY_PEERKEY_ENABLED) { 1576 wpa_printf(MSG_INFO, "TDLS: Invalid RSN Capabilities in " 1577 "TPK M1"); 1578 status = WLAN_STATUS_INVALID_RSN_IE_CAPAB; 1579 goto error; 1580 } 1581 1582 /* Lifetime */ 1583 if (kde.key_lifetime == NULL) { 1584 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1"); 1585 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; 1586 goto error; 1587 } 1588 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime; 1589 lifetime = WPA_GET_LE32(timeoutie->value); 1590 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime); 1591 if (lifetime < 300) { 1592 wpa_printf(MSG_INFO, "TDLS: Too short TPK lifetime"); 1593 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; 1594 goto error; 1595 } 1596 1597skip_rsn: 1598 /* If found, use existing entry instead of adding a new one; 1599 * how to handle the case where both ends initiate at the 1600 * same time? */ 1601 if (existing_peer) { 1602 if (peer->tpk_success) { 1603 wpa_printf(MSG_DEBUG, "TDLS: TDLS Setup Request while " 1604 "direct link is enabled - tear down the " 1605 "old link first"); 1606#if 0 1607 /* TODO: Disabling the link would be more proper 1608 * operation here, but it seems to trigger a race with 1609 * some drivers handling the new request frame. */ 1610 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 1611#else 1612 if (sm->tdls_external_setup) 1613 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, 1614 src_addr); 1615 else 1616 wpa_tdls_del_key(sm, peer); 1617#endif 1618 wpa_tdls_peer_free(sm, peer); 1619 } 1620 1621 /* 1622 * An entry is already present, so check if we already sent a 1623 * TDLS Setup Request. If so, compare MAC addresses and let the 1624 * STA with the lower MAC address continue as the initiator. 1625 * The other negotiation is terminated. 1626 */ 1627 if (peer->initiator) { 1628 if (os_memcmp(sm->own_addr, src_addr, ETH_ALEN) < 0) { 1629 wpa_printf(MSG_DEBUG, "TDLS: Discard request " 1630 "from peer with higher address " 1631 MACSTR, MAC2STR(src_addr)); 1632 return -1; 1633 } else { 1634 wpa_printf(MSG_DEBUG, "TDLS: Accept request " 1635 "from peer with lower address " 1636 MACSTR " (terminate previously " 1637 "initiated negotiation", 1638 MAC2STR(src_addr)); 1639 wpa_tdls_disable_link(sm, peer->addr); 1640 } 1641 } 1642 } 1643 1644#ifdef CONFIG_TDLS_TESTING 1645 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) { 1646 if (os_memcmp(sm->own_addr, peer->addr, ETH_ALEN) < 0) { 1647 /* 1648 * The request frame from us is going to win, so do not 1649 * replace information based on this request frame from 1650 * the peer. 1651 */ 1652 goto skip_rsn_check; 1653 } 1654 } 1655#endif /* CONFIG_TDLS_TESTING */ 1656 1657 peer->initiator = 0; /* Need to check */ 1658 peer->dtoken = dtoken; 1659 1660 if (!wpa_tdls_get_privacy(sm)) { 1661 peer->rsnie_i_len = 0; 1662 peer->rsnie_p_len = 0; 1663 peer->cipher = WPA_CIPHER_NONE; 1664 goto skip_rsn_check; 1665 } 1666 1667 ftie = (struct wpa_tdls_ftie *) kde.ftie; 1668 os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN); 1669 os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len); 1670 peer->rsnie_i_len = kde.rsn_ie_len; 1671 peer->cipher = cipher; 1672 1673 if (os_get_random(peer->rnonce, WPA_NONCE_LEN)) { 1674 wpa_msg(sm->ctx->ctx, MSG_WARNING, 1675 "TDLS: Failed to get random data for responder nonce"); 1676 wpa_tdls_peer_free(sm, peer); 1677 goto error; 1678 } 1679 1680#if 0 1681 /* get version info from RSNIE received from Peer */ 1682 hdr = (struct rsn_ie_hdr *) kde.rsn_ie; 1683 rsn_ver = WPA_GET_LE16(hdr->version); 1684 1685 /* use min(peer's version, out version) */ 1686 if (rsn_ver > RSN_VERSION) 1687 rsn_ver = RSN_VERSION; 1688 1689 hdr = (struct rsn_ie_hdr *) peer->rsnie_p; 1690 1691 hdr->elem_id = WLAN_EID_RSN; 1692 WPA_PUT_LE16(hdr->version, rsn_ver); 1693 pos = (u8 *) (hdr + 1); 1694 1695 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED); 1696 pos += RSN_SELECTOR_LEN; 1697 /* Include only the selected cipher in pairwise cipher suite */ 1698 WPA_PUT_LE16(pos, 1); 1699 pos += 2; 1700 if (cipher == WPA_CIPHER_CCMP) 1701 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 1702 pos += RSN_SELECTOR_LEN; 1703 1704 WPA_PUT_LE16(pos, 1); 1705 pos += 2; 1706 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE); 1707 pos += RSN_SELECTOR_LEN; 1708 1709 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; 1710 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2; 1711 WPA_PUT_LE16(pos, rsn_capab); 1712 pos += 2; 1713 1714 hdr->len = (pos - peer->rsnie_p) - 2; 1715 peer->rsnie_p_len = pos - peer->rsnie_p; 1716#endif 1717 1718 /* temp fix: validation of RSNIE later */ 1719 os_memcpy(peer->rsnie_p, peer->rsnie_i, peer->rsnie_i_len); 1720 peer->rsnie_p_len = peer->rsnie_i_len; 1721 1722 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake", 1723 peer->rsnie_p, peer->rsnie_p_len); 1724 1725 peer->lifetime = lifetime; 1726 1727 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid); 1728 1729skip_rsn_check: 1730 /* add the peer to the driver as a "setup in progress" peer */ 1731 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, NULL, 0, NULL, NULL, 0, 1732 NULL, 0); 1733 1734 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Response / TPK M2"); 1735 if (wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer) < 0) { 1736 wpa_tdls_disable_link(sm, peer->addr); 1737 goto error; 1738 } 1739 1740 return 0; 1741 1742error: 1743 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 1744 status); 1745 return -1; 1746} 1747 1748 1749static void wpa_tdls_enable_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 1750{ 1751 peer->tpk_success = 1; 1752 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer); 1753 if (wpa_tdls_get_privacy(sm)) { 1754 u32 lifetime = peer->lifetime; 1755 /* 1756 * Start the initiator process a bit earlier to avoid race 1757 * condition with the responder sending teardown request. 1758 */ 1759 if (lifetime > 3 && peer->initiator) 1760 lifetime -= 3; 1761 eloop_register_timeout(lifetime, 0, wpa_tdls_tpk_timeout, 1762 sm, peer); 1763#ifdef CONFIG_TDLS_TESTING 1764 if (tdls_testing & TDLS_TESTING_NO_TPK_EXPIRATION) { 1765 wpa_printf(MSG_DEBUG, "TDLS: Testing - disable TPK " 1766 "expiration"); 1767 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer); 1768 } 1769#endif /* CONFIG_TDLS_TESTING */ 1770 } 1771 1772 /* add supported rates, capabilities, and qos_info to the TDLS peer */ 1773 wpa_sm_tdls_peer_addset(sm, peer->addr, 0, peer->capability, 1774 peer->supp_rates, peer->supp_rates_len, 1775 peer->ht_capabilities, peer->vht_capabilities, 1776 peer->qos_info, peer->ext_capab, 1777 peer->ext_capab_len); 1778 1779 wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, peer->addr); 1780} 1781 1782 1783static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr, 1784 const u8 *buf, size_t len) 1785{ 1786 struct wpa_tdls_peer *peer; 1787 struct wpa_eapol_ie_parse kde; 1788 struct wpa_ie_data ie; 1789 int cipher; 1790 struct wpa_tdls_ftie *ftie; 1791 struct wpa_tdls_timeoutie *timeoutie; 1792 struct wpa_tdls_lnkid *lnkid; 1793 u32 lifetime; 1794 u8 dtoken; 1795 int ielen; 1796 u16 status; 1797 const u8 *pos; 1798 1799 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Response / TPK M2 " 1800 "(Peer " MACSTR ")", MAC2STR(src_addr)); 1801 for (peer = sm->tdls; peer; peer = peer->next) { 1802 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) 1803 break; 1804 } 1805 if (peer == NULL) { 1806 wpa_printf(MSG_INFO, "TDLS: No matching peer found for " 1807 "TPK M2: " MACSTR, MAC2STR(src_addr)); 1808 return -1; 1809 } 1810 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_REQUEST); 1811 1812 if (len < 3 + 2 + 1) 1813 return -1; 1814 pos = buf; 1815 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; 1816 status = WPA_GET_LE16(pos); 1817 pos += 2 /* status code */; 1818 1819 if (status != WLAN_STATUS_SUCCESS) { 1820 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M2: %u", 1821 status); 1822 if (sm->tdls_external_setup) 1823 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 1824 return -1; 1825 } 1826 1827 status = WLAN_STATUS_UNSPECIFIED_FAILURE; 1828 1829 /* TODO: need to verify dialog token matches here or in kernel */ 1830 dtoken = *pos++; /* dialog token */ 1831 1832 wpa_printf(MSG_DEBUG, "TDLS: Dialog Token in TPK M2 %d", dtoken); 1833 1834 if (len < 3 + 2 + 1 + 2) 1835 return -1; 1836 1837 /* capability information */ 1838 peer->capability = WPA_GET_LE16(pos); 1839 pos += 2; 1840 1841 ielen = len - (pos - buf); /* start of IE in buf */ 1842 if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0) { 1843 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M2"); 1844 goto error; 1845 } 1846 1847#ifdef CONFIG_TDLS_TESTING 1848 if (tdls_testing & TDLS_TESTING_DECLINE_RESP) { 1849 wpa_printf(MSG_DEBUG, "TDLS: Testing - decline response"); 1850 status = WLAN_STATUS_REQUEST_DECLINED; 1851 goto error; 1852 } 1853#endif /* CONFIG_TDLS_TESTING */ 1854 1855 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { 1856 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in " 1857 "TPK M2"); 1858 goto error; 1859 } 1860 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M2", 1861 kde.lnkid, kde.lnkid_len); 1862 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; 1863 1864 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { 1865 wpa_printf(MSG_INFO, "TDLS: TPK M2 from different BSS"); 1866 status = WLAN_STATUS_NOT_IN_SAME_BSS; 1867 goto error; 1868 } 1869 1870 if (copy_supp_rates(&kde, peer) < 0) 1871 goto error; 1872 1873 if (copy_peer_ht_capab(&kde, peer) < 0) 1874 goto error; 1875 1876 if (copy_peer_vht_capab(&kde, peer) < 0) 1877 goto error; 1878 1879 if (copy_peer_ext_capab(&kde, peer) < 0) 1880 goto error; 1881 1882 peer->qos_info = kde.qosinfo; 1883 1884 if (!wpa_tdls_get_privacy(sm)) { 1885 peer->rsnie_p_len = 0; 1886 peer->cipher = WPA_CIPHER_NONE; 1887 goto skip_rsn; 1888 } 1889 1890 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) || 1891 kde.rsn_ie == NULL) { 1892 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M2"); 1893 status = WLAN_STATUS_INVALID_PARAMETERS; 1894 goto error; 1895 } 1896 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2", 1897 kde.rsn_ie, kde.rsn_ie_len); 1898 1899 /* 1900 * FIX: bitwise comparison of RSN IE is not the correct way of 1901 * validation this. It can be different, but certain fields must 1902 * match. Since we list only a single pairwise cipher in TPK M1, the 1903 * memcmp is likely to work in most cases, though. 1904 */ 1905 if (kde.rsn_ie_len != peer->rsnie_i_len || 1906 os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) != 0) { 1907 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M2 does " 1908 "not match with RSN IE used in TPK M1"); 1909 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Sent in TPK M1", 1910 peer->rsnie_i, peer->rsnie_i_len); 1911 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2", 1912 kde.rsn_ie, kde.rsn_ie_len); 1913 status = WLAN_STATUS_INVALID_RSNIE; 1914 goto error; 1915 } 1916 1917 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) { 1918 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M2"); 1919 status = WLAN_STATUS_INVALID_RSNIE; 1920 goto error; 1921 } 1922 1923 cipher = ie.pairwise_cipher; 1924 if (cipher == WPA_CIPHER_CCMP) { 1925 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link"); 1926 cipher = WPA_CIPHER_CCMP; 1927 } else { 1928 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M2"); 1929 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID; 1930 goto error; 1931 } 1932 1933 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M2", 1934 kde.ftie, sizeof(*ftie)); 1935 ftie = (struct wpa_tdls_ftie *) kde.ftie; 1936 1937 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) { 1938 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does " 1939 "not match with FTIE SNonce used in TPK M1"); 1940 /* Silently discard the frame */ 1941 return -1; 1942 } 1943 1944 /* Responder Nonce and RSN IE */ 1945 os_memcpy(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN); 1946 os_memcpy(peer->rsnie_p, kde.rsn_ie, kde.rsn_ie_len); 1947 peer->rsnie_p_len = kde.rsn_ie_len; 1948 peer->cipher = cipher; 1949 1950 /* Lifetime */ 1951 if (kde.key_lifetime == NULL) { 1952 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M2"); 1953 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; 1954 goto error; 1955 } 1956 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime; 1957 lifetime = WPA_GET_LE32(timeoutie->value); 1958 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M2", 1959 lifetime); 1960 if (lifetime != peer->lifetime) { 1961 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in " 1962 "TPK M2 (expected %u)", lifetime, peer->lifetime); 1963 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; 1964 goto error; 1965 } 1966 1967 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid); 1968 1969 /* Process MIC check to see if TPK M2 is right */ 1970 if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid, 1971 (u8 *) timeoutie, ftie) < 0) { 1972 /* Discard the frame */ 1973 wpa_tdls_del_key(sm, peer); 1974 wpa_tdls_peer_free(sm, peer); 1975 if (sm->tdls_external_setup) 1976 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 1977 return -1; 1978 } 1979 1980 wpa_tdls_set_key(sm, peer); 1981 1982skip_rsn: 1983 peer->dtoken = dtoken; 1984 1985 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Confirm / " 1986 "TPK Handshake Message 3"); 1987 wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer); 1988 1989 wpa_tdls_enable_link(sm, peer); 1990 1991 return 0; 1992 1993error: 1994 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 1995 status); 1996 if (sm->tdls_external_setup) 1997 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 1998 return -1; 1999} 2000 2001 2002static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr, 2003 const u8 *buf, size_t len) 2004{ 2005 struct wpa_tdls_peer *peer; 2006 struct wpa_eapol_ie_parse kde; 2007 struct wpa_tdls_ftie *ftie; 2008 struct wpa_tdls_timeoutie *timeoutie; 2009 struct wpa_tdls_lnkid *lnkid; 2010 int ielen; 2011 u16 status; 2012 const u8 *pos; 2013 u32 lifetime; 2014 2015 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Confirm / TPK M3 " 2016 "(Peer " MACSTR ")", MAC2STR(src_addr)); 2017 for (peer = sm->tdls; peer; peer = peer->next) { 2018 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) 2019 break; 2020 } 2021 if (peer == NULL) { 2022 wpa_printf(MSG_INFO, "TDLS: No matching peer found for " 2023 "TPK M3: " MACSTR, MAC2STR(src_addr)); 2024 return -1; 2025 } 2026 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_RESPONSE); 2027 2028 if (len < 3 + 3) 2029 return -1; 2030 pos = buf; 2031 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; 2032 2033 status = WPA_GET_LE16(pos); 2034 2035 if (status != 0) { 2036 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M3: %u", 2037 status); 2038 if (sm->tdls_external_setup) 2039 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 2040 return -1; 2041 } 2042 pos += 2 /* status code */ + 1 /* dialog token */; 2043 2044 ielen = len - (pos - buf); /* start of IE in buf */ 2045 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) { 2046 wpa_printf(MSG_INFO, "TDLS: Failed to parse KDEs in TPK M3"); 2047 return -1; 2048 } 2049 2050 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { 2051 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M3"); 2052 return -1; 2053 } 2054 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M3", 2055 (u8 *) kde.lnkid, kde.lnkid_len); 2056 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; 2057 2058 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { 2059 wpa_printf(MSG_INFO, "TDLS: TPK M3 from diff BSS"); 2060 return -1; 2061 } 2062 2063 if (!wpa_tdls_get_privacy(sm)) 2064 goto skip_rsn; 2065 2066 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) { 2067 wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M3"); 2068 return -1; 2069 } 2070 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M3", 2071 kde.ftie, sizeof(*ftie)); 2072 ftie = (struct wpa_tdls_ftie *) kde.ftie; 2073 2074 if (kde.rsn_ie == NULL) { 2075 wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M3"); 2076 return -1; 2077 } 2078 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M3", 2079 kde.rsn_ie, kde.rsn_ie_len); 2080 if (kde.rsn_ie_len != peer->rsnie_p_len || 2081 os_memcmp(kde.rsn_ie, peer->rsnie_p, peer->rsnie_p_len) != 0) { 2082 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M3 does not match " 2083 "with the one sent in TPK M2"); 2084 return -1; 2085 } 2086 2087 if (!os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) { 2088 wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does " 2089 "not match with FTIE ANonce used in TPK M2"); 2090 return -1; 2091 } 2092 2093 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) { 2094 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M3 does not " 2095 "match with FTIE SNonce used in TPK M1"); 2096 return -1; 2097 } 2098 2099 if (kde.key_lifetime == NULL) { 2100 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M3"); 2101 return -1; 2102 } 2103 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime; 2104 wpa_hexdump(MSG_DEBUG, "TDLS: Timeout IE Received from TPK M3", 2105 (u8 *) timeoutie, sizeof(*timeoutie)); 2106 lifetime = WPA_GET_LE32(timeoutie->value); 2107 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M3", 2108 lifetime); 2109 if (lifetime != peer->lifetime) { 2110 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in " 2111 "TPK M3 (expected %u)", lifetime, peer->lifetime); 2112 if (sm->tdls_external_setup) 2113 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 2114 return -1; 2115 } 2116 2117 if (wpa_supplicant_verify_tdls_mic(3, peer, (u8 *) lnkid, 2118 (u8 *) timeoutie, ftie) < 0) { 2119 wpa_tdls_del_key(sm, peer); 2120 wpa_tdls_peer_free(sm, peer); 2121 return -1; 2122 } 2123 2124 if (wpa_tdls_set_key(sm, peer) < 0) 2125 return -1; 2126 2127skip_rsn: 2128 wpa_tdls_enable_link(sm, peer); 2129 2130 return 0; 2131} 2132 2133 2134static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs) 2135{ 2136 struct wpa_tdls_timeoutie *lifetime = (struct wpa_tdls_timeoutie *) ie; 2137 2138 os_memset(lifetime, 0, ie_len); 2139 lifetime->ie_type = WLAN_EID_TIMEOUT_INTERVAL; 2140 lifetime->ie_len = sizeof(struct wpa_tdls_timeoutie) - 2; 2141 lifetime->interval_type = WLAN_TIMEOUT_KEY_LIFETIME; 2142 WPA_PUT_LE32(lifetime->value, tsecs); 2143 os_memcpy(pos, ie, ie_len); 2144 return pos + ie_len; 2145} 2146 2147 2148/** 2149 * wpa_tdls_start - Initiate TDLS handshake (send TPK Handshake Message 1) 2150 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2151 * @peer: MAC address of the peer STA 2152 * Returns: 0 on success, or -1 on failure 2153 * 2154 * Send TPK Handshake Message 1 info to driver to start TDLS 2155 * handshake with the peer. 2156 */ 2157int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr) 2158{ 2159 struct wpa_tdls_peer *peer; 2160 int tdls_prohibited = sm->tdls_prohibited; 2161 2162 if (sm->tdls_disabled || !sm->tdls_supported) 2163 return -1; 2164 2165#ifdef CONFIG_TDLS_TESTING 2166 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) && 2167 tdls_prohibited) { 2168 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition " 2169 "on TDLS"); 2170 tdls_prohibited = 0; 2171 } 2172#endif /* CONFIG_TDLS_TESTING */ 2173 2174 if (tdls_prohibited) { 2175 wpa_printf(MSG_DEBUG, "TDLS: TDLS is prohibited in this BSS - " 2176 "reject request to start setup"); 2177 return -1; 2178 } 2179 2180 peer = wpa_tdls_add_peer(sm, addr, NULL); 2181 if (peer == NULL) 2182 return -1; 2183 2184 peer->initiator = 1; 2185 2186 /* add the peer to the driver as a "setup in progress" peer */ 2187 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, NULL, 0, NULL, NULL, 0, 2188 NULL, 0); 2189 2190 if (wpa_tdls_send_tpk_m1(sm, peer) < 0) { 2191 wpa_tdls_disable_link(sm, peer->addr); 2192 return -1; 2193 } 2194 2195 return 0; 2196} 2197 2198 2199void wpa_tdls_remove(struct wpa_sm *sm, const u8 *addr) 2200{ 2201 struct wpa_tdls_peer *peer; 2202 2203 if (sm->tdls_disabled || !sm->tdls_supported) 2204 return; 2205 2206 for (peer = sm->tdls; peer; peer = peer->next) { 2207 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 2208 break; 2209 } 2210 2211 if (peer == NULL || !peer->tpk_success) 2212 return; 2213 2214 if (sm->tdls_external_setup) { 2215 /* 2216 * Disable previous link to allow renegotiation to be completed 2217 * on AP path. 2218 */ 2219 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); 2220 } 2221} 2222 2223 2224/** 2225 * wpa_supplicant_rx_tdls - Receive TDLS data frame 2226 * 2227 * This function is called to receive TDLS (ethertype = 0x890d) data frames. 2228 */ 2229static void wpa_supplicant_rx_tdls(void *ctx, const u8 *src_addr, 2230 const u8 *buf, size_t len) 2231{ 2232 struct wpa_sm *sm = ctx; 2233 struct wpa_tdls_frame *tf; 2234 2235 wpa_hexdump(MSG_DEBUG, "TDLS: Received Data frame encapsulation", 2236 buf, len); 2237 2238 if (sm->tdls_disabled || !sm->tdls_supported) { 2239 wpa_printf(MSG_DEBUG, "TDLS: Discard message - TDLS disabled " 2240 "or unsupported by driver"); 2241 return; 2242 } 2243 2244 if (os_memcmp(src_addr, sm->own_addr, ETH_ALEN) == 0) { 2245 wpa_printf(MSG_DEBUG, "TDLS: Discard copy of own message"); 2246 return; 2247 } 2248 2249 if (len < sizeof(*tf)) { 2250 wpa_printf(MSG_INFO, "TDLS: Drop too short frame"); 2251 return; 2252 } 2253 2254 /* Check to make sure its a valid encapsulated TDLS frame */ 2255 tf = (struct wpa_tdls_frame *) buf; 2256 if (tf->payloadtype != 2 /* TDLS_RFTYPE */ || 2257 tf->category != WLAN_ACTION_TDLS) { 2258 wpa_printf(MSG_INFO, "TDLS: Invalid frame - payloadtype=%u " 2259 "category=%u action=%u", 2260 tf->payloadtype, tf->category, tf->action); 2261 return; 2262 } 2263 2264 switch (tf->action) { 2265 case WLAN_TDLS_SETUP_REQUEST: 2266 wpa_tdls_process_tpk_m1(sm, src_addr, buf, len); 2267 break; 2268 case WLAN_TDLS_SETUP_RESPONSE: 2269 wpa_tdls_process_tpk_m2(sm, src_addr, buf, len); 2270 break; 2271 case WLAN_TDLS_SETUP_CONFIRM: 2272 wpa_tdls_process_tpk_m3(sm, src_addr, buf, len); 2273 break; 2274 case WLAN_TDLS_TEARDOWN: 2275 wpa_tdls_recv_teardown(sm, src_addr, buf, len); 2276 break; 2277 case WLAN_TDLS_DISCOVERY_REQUEST: 2278 wpa_tdls_process_discovery_request(sm, src_addr, buf, len); 2279 break; 2280 default: 2281 /* Kernel code will process remaining frames */ 2282 wpa_printf(MSG_DEBUG, "TDLS: Ignore TDLS frame action code %u", 2283 tf->action); 2284 break; 2285 } 2286} 2287 2288 2289/** 2290 * wpa_tdls_init - Initialize driver interface parameters for TDLS 2291 * @wpa_s: Pointer to wpa_supplicant data 2292 * Returns: 0 on success, -1 on failure 2293 * 2294 * This function is called to initialize driver interface parameters for TDLS. 2295 * wpa_drv_init() must have been called before this function to initialize the 2296 * driver interface. 2297 */ 2298int wpa_tdls_init(struct wpa_sm *sm) 2299{ 2300 if (sm == NULL) 2301 return -1; 2302 2303 sm->l2_tdls = l2_packet_init(sm->bridge_ifname ? sm->bridge_ifname : 2304 sm->ifname, 2305 sm->own_addr, 2306 ETH_P_80211_ENCAP, wpa_supplicant_rx_tdls, 2307 sm, 0); 2308 if (sm->l2_tdls == NULL) { 2309 wpa_printf(MSG_ERROR, "TDLS: Failed to open l2_packet " 2310 "connection"); 2311 return -1; 2312 } 2313 2314 /* 2315 * Drivers that support TDLS but don't implement the get_capa callback 2316 * are assumed to perform everything internally 2317 */ 2318 if (wpa_sm_tdls_get_capa(sm, &sm->tdls_supported, 2319 &sm->tdls_external_setup) < 0) { 2320 sm->tdls_supported = 1; 2321 sm->tdls_external_setup = 0; 2322 } 2323 2324 wpa_printf(MSG_DEBUG, "TDLS: TDLS operation%s supported by " 2325 "driver", sm->tdls_supported ? "" : " not"); 2326 wpa_printf(MSG_DEBUG, "TDLS: Driver uses %s link setup", 2327 sm->tdls_external_setup ? "external" : "internal"); 2328 2329 return 0; 2330} 2331 2332 2333void wpa_tdls_teardown_peers(struct wpa_sm *sm) 2334{ 2335 struct wpa_tdls_peer *peer; 2336 2337 peer = sm->tdls; 2338 2339 wpa_printf(MSG_DEBUG, "TDLS: Tear down peers"); 2340 2341 while (peer) { 2342 wpa_printf(MSG_DEBUG, "TDLS: Tear down peer " MACSTR, 2343 MAC2STR(peer->addr)); 2344 if (sm->tdls_external_setup) 2345 wpa_tdls_send_teardown(sm, peer->addr, 2346 WLAN_REASON_DEAUTH_LEAVING); 2347 else 2348 wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr); 2349 2350 peer = peer->next; 2351 } 2352} 2353 2354 2355static void wpa_tdls_remove_peers(struct wpa_sm *sm) 2356{ 2357 struct wpa_tdls_peer *peer, *tmp; 2358 2359 peer = sm->tdls; 2360 sm->tdls = NULL; 2361 2362 while (peer) { 2363 int res; 2364 tmp = peer->next; 2365 res = wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); 2366 wpa_printf(MSG_DEBUG, "TDLS: Remove peer " MACSTR " (res=%d)", 2367 MAC2STR(peer->addr), res); 2368 wpa_tdls_peer_free(sm, peer); 2369 os_free(peer); 2370 peer = tmp; 2371 } 2372} 2373 2374 2375/** 2376 * wpa_tdls_deinit - Deinitialize driver interface parameters for TDLS 2377 * 2378 * This function is called to recover driver interface parameters for TDLS 2379 * and frees resources allocated for it. 2380 */ 2381void wpa_tdls_deinit(struct wpa_sm *sm) 2382{ 2383 if (sm == NULL) 2384 return; 2385 2386 if (sm->l2_tdls) 2387 l2_packet_deinit(sm->l2_tdls); 2388 sm->l2_tdls = NULL; 2389 2390 wpa_tdls_remove_peers(sm); 2391} 2392 2393 2394void wpa_tdls_assoc(struct wpa_sm *sm) 2395{ 2396 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on association"); 2397 wpa_tdls_remove_peers(sm); 2398} 2399 2400 2401void wpa_tdls_disassoc(struct wpa_sm *sm) 2402{ 2403 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on disassociation"); 2404 wpa_tdls_remove_peers(sm); 2405} 2406 2407 2408static int wpa_tdls_prohibited(const u8 *ies, size_t len) 2409{ 2410 struct wpa_eapol_ie_parse elems; 2411 2412 if (ies == NULL) 2413 return 0; 2414 2415 if (wpa_supplicant_parse_ies(ies, len, &elems) < 0) 2416 return 0; 2417 2418 if (elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5) 2419 return 0; 2420 2421 /* bit 38 - TDLS Prohibited */ 2422 return !!(elems.ext_capab[2 + 4] & 0x40); 2423} 2424 2425 2426void wpa_tdls_ap_ies(struct wpa_sm *sm, const u8 *ies, size_t len) 2427{ 2428 sm->tdls_prohibited = wpa_tdls_prohibited(ies, len); 2429 wpa_printf(MSG_DEBUG, "TDLS: TDLS is %s in the target BSS", 2430 sm->tdls_prohibited ? "prohibited" : "allowed"); 2431} 2432 2433 2434void wpa_tdls_assoc_resp_ies(struct wpa_sm *sm, const u8 *ies, size_t len) 2435{ 2436 if (!sm->tdls_prohibited && wpa_tdls_prohibited(ies, len)) { 2437 wpa_printf(MSG_DEBUG, "TDLS: TDLS prohibited based on " 2438 "(Re)Association Response IEs"); 2439 sm->tdls_prohibited = 1; 2440 } 2441} 2442 2443 2444void wpa_tdls_enable(struct wpa_sm *sm, int enabled) 2445{ 2446 wpa_printf(MSG_DEBUG, "TDLS: %s", enabled ? "enabled" : "disabled"); 2447 sm->tdls_disabled = !enabled; 2448} 2449 2450 2451int wpa_tdls_is_external_setup(struct wpa_sm *sm) 2452{ 2453 return sm->tdls_external_setup; 2454} 2455