tdls.c revision f7e0a9905988e62e4f70fed8b795722abeab719b
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_M1_RETRY_COUNT 3 41#define TPK_M1_TIMEOUT 5000 /* in milliseconds */ 42#define TPK_M2_RETRY_COUNT 10 43#define TPK_M2_TIMEOUT 500 /* in milliseconds */ 44 45#define TDLS_MIC_LEN 16 46 47#define TDLS_TIMEOUT_LEN 4 48 49struct wpa_tdls_ftie { 50 u8 ie_type; /* FTIE */ 51 u8 ie_len; 52 u8 mic_ctrl[2]; 53 u8 mic[TDLS_MIC_LEN]; 54 u8 Anonce[WPA_NONCE_LEN]; /* Responder Nonce in TDLS */ 55 u8 Snonce[WPA_NONCE_LEN]; /* Initiator Nonce in TDLS */ 56 /* followed by optional elements */ 57} STRUCT_PACKED; 58 59struct wpa_tdls_timeoutie { 60 u8 ie_type; /* Timeout IE */ 61 u8 ie_len; 62 u8 interval_type; 63 u8 value[TDLS_TIMEOUT_LEN]; 64} STRUCT_PACKED; 65 66struct wpa_tdls_lnkid { 67 u8 ie_type; /* Link Identifier IE */ 68 u8 ie_len; 69 u8 bssid[ETH_ALEN]; 70 u8 init_sta[ETH_ALEN]; 71 u8 resp_sta[ETH_ALEN]; 72} STRUCT_PACKED; 73 74/* TDLS frame headers as per IEEE Std 802.11z-2010 */ 75struct wpa_tdls_frame { 76 u8 payloadtype; /* IEEE80211_TDLS_RFTYPE */ 77 u8 category; /* Category */ 78 u8 action; /* Action (enum tdls_frame_type) */ 79} STRUCT_PACKED; 80 81static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs); 82static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx); 83static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer); 84 85 86#define TDLS_MAX_IE_LEN 80 87#define IEEE80211_MAX_SUPP_RATES 32 88 89struct wpa_tdls_peer { 90 struct wpa_tdls_peer *next; 91 unsigned int reconfig_key:1; 92 int initiator; /* whether this end was initiator for TDLS setup */ 93 u8 addr[ETH_ALEN]; /* other end MAC address */ 94 u8 inonce[WPA_NONCE_LEN]; /* Initiator Nonce */ 95 u8 rnonce[WPA_NONCE_LEN]; /* Responder Nonce */ 96 u8 rsnie_i[TDLS_MAX_IE_LEN]; /* Initiator RSN IE */ 97 size_t rsnie_i_len; 98 u8 rsnie_p[TDLS_MAX_IE_LEN]; /* Peer RSN IE */ 99 size_t rsnie_p_len; 100 u32 lifetime; 101 int cipher; /* Selected cipher (WPA_CIPHER_*) */ 102 u8 dtoken; 103 104 struct tpk { 105 u8 kck[16]; /* TPK-KCK */ 106 u8 tk[16]; /* TPK-TK; assuming only CCMP will be used */ 107 } tpk; 108 int tpk_set; 109 int tpk_success; 110 111 struct tpk_timer { 112 u8 dest[ETH_ALEN]; 113 int count; /* Retry Count */ 114 int timer; /* Timeout in milliseconds */ 115 u8 action_code; /* TDLS frame type */ 116 u8 dialog_token; 117 u16 status_code; 118 int buf_len; /* length of TPK message for retransmission */ 119 u8 *buf; /* buffer for TPK message */ 120 } sm_tmr; 121 122 u16 capability; 123 124 u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; 125 size_t supp_rates_len; 126 127 struct ieee80211_ht_capabilities *ht_capabilities; 128 struct ieee80211_vht_capabilities *vht_capabilities; 129 130 u8 qos_info; 131 132 u16 aid; 133 134 u8 *ext_capab; 135 size_t ext_capab_len; 136}; 137 138 139static int wpa_tdls_get_privacy(struct wpa_sm *sm) 140{ 141 /* 142 * Get info needed from supplicant to check if the current BSS supports 143 * security. Other than OPEN mode, rest are considered secured 144 * WEP/WPA/WPA2 hence TDLS frames are processed for TPK handshake. 145 */ 146 return sm->pairwise_cipher != WPA_CIPHER_NONE; 147} 148 149 150static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len) 151{ 152 os_memcpy(pos, ie, ie_len); 153 return pos + ie_len; 154} 155 156 157static int wpa_tdls_del_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 158{ 159 if (wpa_sm_set_key(sm, WPA_ALG_NONE, peer->addr, 160 0, 0, NULL, 0, NULL, 0) < 0) { 161 wpa_printf(MSG_WARNING, "TDLS: Failed to delete TPK-TK from " 162 "the driver"); 163 return -1; 164 } 165 166 return 0; 167} 168 169 170static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 171{ 172 u8 key_len; 173 u8 rsc[6]; 174 enum wpa_alg alg; 175 176 os_memset(rsc, 0, 6); 177 178 switch (peer->cipher) { 179 case WPA_CIPHER_CCMP: 180 alg = WPA_ALG_CCMP; 181 key_len = 16; 182 break; 183 case WPA_CIPHER_NONE: 184 wpa_printf(MSG_DEBUG, "TDLS: Pairwise Cipher Suite: " 185 "NONE - do not use pairwise keys"); 186 return -1; 187 default: 188 wpa_printf(MSG_WARNING, "TDLS: Unsupported pairwise cipher %d", 189 sm->pairwise_cipher); 190 return -1; 191 } 192 193 if (wpa_sm_set_key(sm, alg, peer->addr, -1, 1, 194 rsc, sizeof(rsc), peer->tpk.tk, key_len) < 0) { 195 wpa_printf(MSG_WARNING, "TDLS: Failed to set TPK to the " 196 "driver"); 197 return -1; 198 } 199 return 0; 200} 201 202 203static int wpa_tdls_send_tpk_msg(struct wpa_sm *sm, const u8 *dst, 204 u8 action_code, u8 dialog_token, 205 u16 status_code, const u8 *buf, size_t len) 206{ 207 return wpa_sm_send_tdls_mgmt(sm, dst, action_code, dialog_token, 208 status_code, buf, len); 209} 210 211 212static int wpa_tdls_tpk_send(struct wpa_sm *sm, const u8 *dest, u8 action_code, 213 u8 dialog_token, u16 status_code, 214 const u8 *msg, size_t msg_len) 215{ 216 struct wpa_tdls_peer *peer; 217 218 wpa_printf(MSG_DEBUG, "TDLS: TPK send dest=" MACSTR " action_code=%u " 219 "dialog_token=%u status_code=%u msg_len=%u", 220 MAC2STR(dest), action_code, dialog_token, status_code, 221 (unsigned int) msg_len); 222 223 if (wpa_tdls_send_tpk_msg(sm, dest, action_code, dialog_token, 224 status_code, msg, msg_len)) { 225 wpa_printf(MSG_INFO, "TDLS: Failed to send message " 226 "(action_code=%u)", action_code); 227 return -1; 228 } 229 230 if (action_code == WLAN_TDLS_SETUP_CONFIRM || 231 action_code == WLAN_TDLS_TEARDOWN || 232 action_code == WLAN_TDLS_DISCOVERY_REQUEST || 233 action_code == WLAN_TDLS_DISCOVERY_RESPONSE) 234 return 0; /* No retries */ 235 236 for (peer = sm->tdls; peer; peer = peer->next) { 237 if (os_memcmp(peer->addr, dest, ETH_ALEN) == 0) 238 break; 239 } 240 241 if (peer == NULL) { 242 wpa_printf(MSG_INFO, "TDLS: No matching entry found for " 243 "retry " MACSTR, MAC2STR(dest)); 244 return 0; 245 } 246 247 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 248 249 if (action_code == WLAN_TDLS_SETUP_RESPONSE) { 250 peer->sm_tmr.count = TPK_M2_RETRY_COUNT; 251 peer->sm_tmr.timer = TPK_M2_TIMEOUT; 252 } else { 253 peer->sm_tmr.count = TPK_M1_RETRY_COUNT; 254 peer->sm_tmr.timer = TPK_M1_TIMEOUT; 255 } 256 257 /* Copy message to resend on timeout */ 258 os_memcpy(peer->sm_tmr.dest, dest, ETH_ALEN); 259 peer->sm_tmr.action_code = action_code; 260 peer->sm_tmr.dialog_token = dialog_token; 261 peer->sm_tmr.status_code = status_code; 262 peer->sm_tmr.buf_len = msg_len; 263 os_free(peer->sm_tmr.buf); 264 peer->sm_tmr.buf = os_malloc(msg_len); 265 if (peer->sm_tmr.buf == NULL) 266 return -1; 267 os_memcpy(peer->sm_tmr.buf, msg, msg_len); 268 269 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout registered " 270 "(action_code=%u)", action_code); 271 eloop_register_timeout(peer->sm_tmr.timer / 1000, 272 (peer->sm_tmr.timer % 1000) * 1000, 273 wpa_tdls_tpk_retry_timeout, sm, peer); 274 return 0; 275} 276 277 278static int wpa_tdls_do_teardown(struct wpa_sm *sm, struct wpa_tdls_peer *peer, 279 u16 reason_code, int free_peer) 280{ 281 int ret; 282 283 if (sm->tdls_external_setup) { 284 ret = wpa_tdls_send_teardown(sm, peer->addr, reason_code); 285 286 /* disable the link after teardown was sent */ 287 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); 288 } else { 289 ret = wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr); 290 } 291 292 if (sm->tdls_external_setup || free_peer) 293 wpa_tdls_peer_free(sm, peer); 294 295 return ret; 296} 297 298 299static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx) 300{ 301 302 struct wpa_sm *sm = eloop_ctx; 303 struct wpa_tdls_peer *peer = timeout_ctx; 304 305 if (peer->sm_tmr.count) { 306 peer->sm_tmr.count--; 307 308 wpa_printf(MSG_INFO, "TDLS: Retrying sending of message " 309 "(action_code=%u)", 310 peer->sm_tmr.action_code); 311 312 if (peer->sm_tmr.buf == NULL) { 313 wpa_printf(MSG_INFO, "TDLS: No retry buffer available " 314 "for action_code=%u", 315 peer->sm_tmr.action_code); 316 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, 317 peer); 318 return; 319 } 320 321 /* resend TPK Handshake Message to Peer */ 322 if (wpa_tdls_send_tpk_msg(sm, peer->sm_tmr.dest, 323 peer->sm_tmr.action_code, 324 peer->sm_tmr.dialog_token, 325 peer->sm_tmr.status_code, 326 peer->sm_tmr.buf, 327 peer->sm_tmr.buf_len)) { 328 wpa_printf(MSG_INFO, "TDLS: Failed to retry " 329 "transmission"); 330 } 331 332 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 333 eloop_register_timeout(peer->sm_tmr.timer / 1000, 334 (peer->sm_tmr.timer % 1000) * 1000, 335 wpa_tdls_tpk_retry_timeout, sm, peer); 336 } else { 337 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 338 339 wpa_printf(MSG_DEBUG, "TDLS: Sending Teardown Request"); 340 wpa_tdls_do_teardown(sm, peer, 341 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1); 342 } 343} 344 345 346static void wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm *sm, 347 struct wpa_tdls_peer *peer, 348 u8 action_code) 349{ 350 if (action_code == peer->sm_tmr.action_code) { 351 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout cancelled for " 352 "action_code=%u", action_code); 353 354 /* Cancel Timeout registered */ 355 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 356 357 /* free all resources meant for retry */ 358 os_free(peer->sm_tmr.buf); 359 peer->sm_tmr.buf = NULL; 360 361 peer->sm_tmr.count = 0; 362 peer->sm_tmr.timer = 0; 363 peer->sm_tmr.buf_len = 0; 364 peer->sm_tmr.action_code = 0xff; 365 } else { 366 wpa_printf(MSG_INFO, "TDLS: Error in cancelling retry timeout " 367 "(Unknown action_code=%u)", action_code); 368 } 369} 370 371 372static void wpa_tdls_generate_tpk(struct wpa_tdls_peer *peer, 373 const u8 *own_addr, const u8 *bssid) 374{ 375 u8 key_input[SHA256_MAC_LEN]; 376 const u8 *nonce[2]; 377 size_t len[2]; 378 u8 data[3 * ETH_ALEN]; 379 380 /* IEEE Std 802.11z-2010 8.5.9.1: 381 * TPK-Key-Input = SHA-256(min(SNonce, ANonce) || max(SNonce, ANonce)) 382 */ 383 len[0] = WPA_NONCE_LEN; 384 len[1] = WPA_NONCE_LEN; 385 if (os_memcmp(peer->inonce, peer->rnonce, WPA_NONCE_LEN) < 0) { 386 nonce[0] = peer->inonce; 387 nonce[1] = peer->rnonce; 388 } else { 389 nonce[0] = peer->rnonce; 390 nonce[1] = peer->inonce; 391 } 392 wpa_hexdump(MSG_DEBUG, "TDLS: min(Nonce)", nonce[0], WPA_NONCE_LEN); 393 wpa_hexdump(MSG_DEBUG, "TDLS: max(Nonce)", nonce[1], WPA_NONCE_LEN); 394 sha256_vector(2, nonce, len, key_input); 395 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-Key-Input", 396 key_input, SHA256_MAC_LEN); 397 398 /* 399 * TPK-Key-Data = KDF-N_KEY(TPK-Key-Input, "TDLS PMK", 400 * min(MAC_I, MAC_R) || max(MAC_I, MAC_R) || BSSID || N_KEY) 401 * TODO: is N_KEY really included in KDF Context and if so, in which 402 * presentation format (little endian 16-bit?) is it used? It gets 403 * added by the KDF anyway.. 404 */ 405 406 if (os_memcmp(own_addr, peer->addr, ETH_ALEN) < 0) { 407 os_memcpy(data, own_addr, ETH_ALEN); 408 os_memcpy(data + ETH_ALEN, peer->addr, ETH_ALEN); 409 } else { 410 os_memcpy(data, peer->addr, ETH_ALEN); 411 os_memcpy(data + ETH_ALEN, own_addr, ETH_ALEN); 412 } 413 os_memcpy(data + 2 * ETH_ALEN, bssid, ETH_ALEN); 414 wpa_hexdump(MSG_DEBUG, "TDLS: KDF Context", data, sizeof(data)); 415 416 sha256_prf(key_input, SHA256_MAC_LEN, "TDLS PMK", data, sizeof(data), 417 (u8 *) &peer->tpk, sizeof(peer->tpk)); 418 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-KCK", 419 peer->tpk.kck, sizeof(peer->tpk.kck)); 420 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-TK", 421 peer->tpk.tk, sizeof(peer->tpk.tk)); 422 peer->tpk_set = 1; 423} 424 425 426/** 427 * wpa_tdls_ftie_mic - Calculate TDLS FTIE MIC 428 * @kck: TPK-KCK 429 * @lnkid: Pointer to the beginning of Link Identifier IE 430 * @rsnie: Pointer to the beginning of RSN IE used for handshake 431 * @timeoutie: Pointer to the beginning of Timeout IE used for handshake 432 * @ftie: Pointer to the beginning of FT IE 433 * @mic: Pointer for writing MIC 434 * 435 * Calculate MIC for TDLS frame. 436 */ 437static int wpa_tdls_ftie_mic(const u8 *kck, u8 trans_seq, const u8 *lnkid, 438 const u8 *rsnie, const u8 *timeoutie, 439 const u8 *ftie, u8 *mic) 440{ 441 u8 *buf, *pos; 442 struct wpa_tdls_ftie *_ftie; 443 const struct wpa_tdls_lnkid *_lnkid; 444 int ret; 445 int len = 2 * ETH_ALEN + 1 + 2 + lnkid[1] + 2 + rsnie[1] + 446 2 + timeoutie[1] + 2 + ftie[1]; 447 buf = os_zalloc(len); 448 if (!buf) { 449 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation"); 450 return -1; 451 } 452 453 pos = buf; 454 _lnkid = (const struct wpa_tdls_lnkid *) lnkid; 455 /* 1) TDLS initiator STA MAC address */ 456 os_memcpy(pos, _lnkid->init_sta, ETH_ALEN); 457 pos += ETH_ALEN; 458 /* 2) TDLS responder STA MAC address */ 459 os_memcpy(pos, _lnkid->resp_sta, ETH_ALEN); 460 pos += ETH_ALEN; 461 /* 3) Transaction Sequence number */ 462 *pos++ = trans_seq; 463 /* 4) Link Identifier IE */ 464 os_memcpy(pos, lnkid, 2 + lnkid[1]); 465 pos += 2 + lnkid[1]; 466 /* 5) RSN IE */ 467 os_memcpy(pos, rsnie, 2 + rsnie[1]); 468 pos += 2 + rsnie[1]; 469 /* 6) Timeout Interval IE */ 470 os_memcpy(pos, timeoutie, 2 + timeoutie[1]); 471 pos += 2 + timeoutie[1]; 472 /* 7) FTIE, with the MIC field of the FTIE set to 0 */ 473 os_memcpy(pos, ftie, 2 + ftie[1]); 474 _ftie = (struct wpa_tdls_ftie *) pos; 475 os_memset(_ftie->mic, 0, TDLS_MIC_LEN); 476 pos += 2 + ftie[1]; 477 478 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf); 479 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16); 480 ret = omac1_aes_128(kck, buf, pos - buf, mic); 481 os_free(buf); 482 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16); 483 return ret; 484} 485 486 487/** 488 * wpa_tdls_key_mic_teardown - Calculate TDLS FTIE MIC for Teardown frame 489 * @kck: TPK-KCK 490 * @trans_seq: Transaction Sequence Number (4 - Teardown) 491 * @rcode: Reason code for Teardown 492 * @dtoken: Dialog Token used for that particular link 493 * @lnkid: Pointer to the beginning of Link Identifier IE 494 * @ftie: Pointer to the beginning of FT IE 495 * @mic: Pointer for writing MIC 496 * 497 * Calculate MIC for TDLS frame. 498 */ 499static int wpa_tdls_key_mic_teardown(const u8 *kck, u8 trans_seq, u16 rcode, 500 u8 dtoken, const u8 *lnkid, 501 const u8 *ftie, u8 *mic) 502{ 503 u8 *buf, *pos; 504 struct wpa_tdls_ftie *_ftie; 505 int ret; 506 int len; 507 508 if (lnkid == NULL) 509 return -1; 510 511 len = 2 + lnkid[1] + sizeof(rcode) + sizeof(dtoken) + 512 sizeof(trans_seq) + 2 + ftie[1]; 513 514 buf = os_zalloc(len); 515 if (!buf) { 516 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation"); 517 return -1; 518 } 519 520 pos = buf; 521 /* 1) Link Identifier IE */ 522 os_memcpy(pos, lnkid, 2 + lnkid[1]); 523 pos += 2 + lnkid[1]; 524 /* 2) Reason Code */ 525 WPA_PUT_LE16(pos, rcode); 526 pos += sizeof(rcode); 527 /* 3) Dialog token */ 528 *pos++ = dtoken; 529 /* 4) Transaction Sequence number */ 530 *pos++ = trans_seq; 531 /* 7) FTIE, with the MIC field of the FTIE set to 0 */ 532 os_memcpy(pos, ftie, 2 + ftie[1]); 533 _ftie = (struct wpa_tdls_ftie *) pos; 534 os_memset(_ftie->mic, 0, TDLS_MIC_LEN); 535 pos += 2 + ftie[1]; 536 537 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf); 538 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16); 539 ret = omac1_aes_128(kck, buf, pos - buf, mic); 540 os_free(buf); 541 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16); 542 return ret; 543} 544 545 546static int wpa_supplicant_verify_tdls_mic(u8 trans_seq, 547 struct wpa_tdls_peer *peer, 548 const u8 *lnkid, const u8 *timeoutie, 549 const struct wpa_tdls_ftie *ftie) 550{ 551 u8 mic[16]; 552 553 if (peer->tpk_set) { 554 wpa_tdls_ftie_mic(peer->tpk.kck, trans_seq, lnkid, 555 peer->rsnie_p, timeoutie, (u8 *) ftie, 556 mic); 557 if (os_memcmp(mic, ftie->mic, 16) != 0) { 558 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in FTIE - " 559 "dropping packet"); 560 wpa_hexdump(MSG_DEBUG, "TDLS: Received MIC", 561 ftie->mic, 16); 562 wpa_hexdump(MSG_DEBUG, "TDLS: Calculated MIC", 563 mic, 16); 564 return -1; 565 } 566 } else { 567 wpa_printf(MSG_WARNING, "TDLS: Could not verify TDLS MIC, " 568 "TPK not set - dropping packet"); 569 return -1; 570 } 571 return 0; 572} 573 574 575static int wpa_supplicant_verify_tdls_mic_teardown( 576 u8 trans_seq, u16 rcode, u8 dtoken, struct wpa_tdls_peer *peer, 577 const u8 *lnkid, const struct wpa_tdls_ftie *ftie) 578{ 579 u8 mic[16]; 580 581 if (peer->tpk_set) { 582 wpa_tdls_key_mic_teardown(peer->tpk.kck, trans_seq, rcode, 583 dtoken, lnkid, (u8 *) ftie, mic); 584 if (os_memcmp(mic, ftie->mic, 16) != 0) { 585 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in Teardown - " 586 "dropping packet"); 587 return -1; 588 } 589 } else { 590 wpa_printf(MSG_INFO, "TDLS: Could not verify TDLS Teardown " 591 "MIC, TPK not set - dropping packet"); 592 return -1; 593 } 594 return 0; 595} 596 597 598static void wpa_tdls_tpk_timeout(void *eloop_ctx, void *timeout_ctx) 599{ 600 struct wpa_sm *sm = eloop_ctx; 601 struct wpa_tdls_peer *peer = timeout_ctx; 602 603 /* 604 * On TPK lifetime expiration, we have an option of either tearing down 605 * the direct link or trying to re-initiate it. The selection of what 606 * to do is not strictly speaking controlled by our role in the expired 607 * link, but for now, use that to select whether to renew or tear down 608 * the link. 609 */ 610 611 if (peer->initiator) { 612 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR 613 " - try to renew", MAC2STR(peer->addr)); 614 wpa_tdls_start(sm, peer->addr); 615 } else { 616 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR 617 " - tear down", MAC2STR(peer->addr)); 618 wpa_tdls_do_teardown(sm, peer, 619 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1); 620 } 621} 622 623 624static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 625{ 626 wpa_printf(MSG_DEBUG, "TDLS: Clear state for peer " MACSTR, 627 MAC2STR(peer->addr)); 628 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer); 629 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 630 peer->reconfig_key = 0; 631 peer->initiator = 0; 632 os_free(peer->sm_tmr.buf); 633 peer->sm_tmr.buf = NULL; 634 os_free(peer->ht_capabilities); 635 peer->ht_capabilities = NULL; 636 os_free(peer->vht_capabilities); 637 peer->vht_capabilities = NULL; 638 os_free(peer->ext_capab); 639 peer->ext_capab = NULL; 640 peer->rsnie_i_len = peer->rsnie_p_len = 0; 641 peer->cipher = 0; 642 peer->tpk_set = peer->tpk_success = 0; 643 os_memset(&peer->tpk, 0, sizeof(peer->tpk)); 644 os_memset(peer->inonce, 0, WPA_NONCE_LEN); 645 os_memset(peer->rnonce, 0, WPA_NONCE_LEN); 646} 647 648 649static void wpa_tdls_linkid(struct wpa_sm *sm, struct wpa_tdls_peer *peer, 650 struct wpa_tdls_lnkid *lnkid) 651{ 652 lnkid->ie_type = WLAN_EID_LINK_ID; 653 lnkid->ie_len = 3 * ETH_ALEN; 654 os_memcpy(lnkid->bssid, sm->bssid, ETH_ALEN); 655 if (peer->initiator) { 656 os_memcpy(lnkid->init_sta, sm->own_addr, ETH_ALEN); 657 os_memcpy(lnkid->resp_sta, peer->addr, ETH_ALEN); 658 } else { 659 os_memcpy(lnkid->init_sta, peer->addr, ETH_ALEN); 660 os_memcpy(lnkid->resp_sta, sm->own_addr, ETH_ALEN); 661 } 662} 663 664 665int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr, u16 reason_code) 666{ 667 struct wpa_tdls_peer *peer; 668 struct wpa_tdls_ftie *ftie; 669 struct wpa_tdls_lnkid lnkid; 670 u8 dialog_token; 671 u8 *rbuf, *pos; 672 int ielen; 673 674 if (sm->tdls_disabled || !sm->tdls_supported) 675 return -1; 676 677 /* Find the node and free from the list */ 678 for (peer = sm->tdls; peer; peer = peer->next) { 679 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 680 break; 681 } 682 683 if (peer == NULL) { 684 wpa_printf(MSG_INFO, "TDLS: No matching entry found for " 685 "Teardown " MACSTR, MAC2STR(addr)); 686 return 0; 687 } 688 689 dialog_token = peer->dtoken; 690 691 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown for " MACSTR, 692 MAC2STR(addr)); 693 694 ielen = 0; 695 if (wpa_tdls_get_privacy(sm) && peer->tpk_set && peer->tpk_success) { 696 /* To add FTIE for Teardown request and compute MIC */ 697 ielen += sizeof(*ftie); 698#ifdef CONFIG_TDLS_TESTING 699 if (tdls_testing & TDLS_TESTING_LONG_FRAME) 700 ielen += 170; 701#endif /* CONFIG_TDLS_TESTING */ 702 } 703 704 rbuf = os_zalloc(ielen + 1); 705 if (rbuf == NULL) 706 return -1; 707 pos = rbuf; 708 709 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success) 710 goto skip_ies; 711 712 ftie = (struct wpa_tdls_ftie *) pos; 713 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; 714 /* Using the recent nonce which should be for CONFIRM frame */ 715 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN); 716 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); 717 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; 718 pos = (u8 *) (ftie + 1); 719#ifdef CONFIG_TDLS_TESTING 720 if (tdls_testing & TDLS_TESTING_LONG_FRAME) { 721 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " 722 "FTIE"); 723 ftie->ie_len += 170; 724 *pos++ = 255; /* FTIE subelem */ 725 *pos++ = 168; /* FTIE subelem length */ 726 pos += 168; 727 } 728#endif /* CONFIG_TDLS_TESTING */ 729 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TDLS Teardown handshake", 730 (u8 *) ftie, pos - (u8 *) ftie); 731 732 /* compute MIC before sending */ 733 wpa_tdls_linkid(sm, peer, &lnkid); 734 wpa_tdls_key_mic_teardown(peer->tpk.kck, 4, reason_code, 735 dialog_token, (u8 *) &lnkid, (u8 *) ftie, 736 ftie->mic); 737 738skip_ies: 739 /* TODO: register for a Timeout handler, if Teardown is not received at 740 * the other end, then try again another time */ 741 742 /* request driver to send Teardown using this FTIE */ 743 wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_TEARDOWN, 0, 744 reason_code, rbuf, pos - rbuf); 745 os_free(rbuf); 746 747 /* clear the Peerkey statemachine */ 748 wpa_tdls_peer_free(sm, peer); 749 750 return 0; 751} 752 753 754int wpa_tdls_teardown_link(struct wpa_sm *sm, const u8 *addr, u16 reason_code) 755{ 756 struct wpa_tdls_peer *peer; 757 758 if (sm->tdls_disabled || !sm->tdls_supported) 759 return -1; 760 761 for (peer = sm->tdls; peer; peer = peer->next) { 762 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 763 break; 764 } 765 766 if (peer == NULL) { 767 wpa_printf(MSG_DEBUG, "TDLS: Could not find peer " MACSTR 768 " for link Teardown", MAC2STR(addr)); 769 return -1; 770 } 771 772 if (!peer->tpk_success) { 773 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR 774 " not connected - cannot Teardown link", MAC2STR(addr)); 775 return -1; 776 } 777 778 return wpa_tdls_do_teardown(sm, peer, reason_code, 0); 779} 780 781 782void wpa_tdls_disable_link(struct wpa_sm *sm, const u8 *addr) 783{ 784 struct wpa_tdls_peer *peer; 785 786 for (peer = sm->tdls; peer; peer = peer->next) { 787 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 788 break; 789 } 790 791 if (peer) { 792 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, addr); 793 wpa_tdls_peer_free(sm, peer); 794 } 795} 796 797 798static int wpa_tdls_recv_teardown(struct wpa_sm *sm, const u8 *src_addr, 799 const u8 *buf, size_t len) 800{ 801 struct wpa_tdls_peer *peer = NULL; 802 struct wpa_tdls_ftie *ftie; 803 struct wpa_tdls_lnkid *lnkid; 804 struct wpa_eapol_ie_parse kde; 805 u16 reason_code; 806 const u8 *pos; 807 int ielen; 808 809 /* Find the node and free from the list */ 810 for (peer = sm->tdls; peer; peer = peer->next) { 811 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) 812 break; 813 } 814 815 if (peer == NULL) { 816 wpa_printf(MSG_INFO, "TDLS: No matching entry found for " 817 "Teardown " MACSTR, MAC2STR(src_addr)); 818 return 0; 819 } 820 821 pos = buf; 822 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; 823 824 reason_code = WPA_GET_LE16(pos); 825 pos += 2; 826 827 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown Request from " MACSTR 828 " (reason code %u)", MAC2STR(src_addr), reason_code); 829 830 ielen = len - (pos - buf); /* start of IE in buf */ 831 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) { 832 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in Teardown"); 833 return -1; 834 } 835 836 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { 837 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TDLS " 838 "Teardown"); 839 return -1; 840 } 841 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; 842 843 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success) 844 goto skip_ftie; 845 846 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) { 847 wpa_printf(MSG_INFO, "TDLS: No FTIE in TDLS Teardown"); 848 return -1; 849 } 850 851 ftie = (struct wpa_tdls_ftie *) kde.ftie; 852 853 /* Process MIC check to see if TDLS Teardown is right */ 854 if (wpa_supplicant_verify_tdls_mic_teardown(4, reason_code, 855 peer->dtoken, peer, 856 (u8 *) lnkid, ftie) < 0) { 857 wpa_printf(MSG_DEBUG, "TDLS: MIC failure for TDLS " 858 "Teardown Request from " MACSTR, MAC2STR(src_addr)); 859 return -1; 860 } 861 862skip_ftie: 863 /* 864 * Request the driver to disable the direct link and clear associated 865 * keys. 866 */ 867 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 868 869 /* clear the Peerkey statemachine */ 870 wpa_tdls_peer_free(sm, peer); 871 872 return 0; 873} 874 875 876/** 877 * wpa_tdls_send_error - To send suitable TDLS status response with 878 * appropriate status code mentioning reason for error/failure. 879 * @dst - MAC addr of Peer station 880 * @tdls_action - TDLS frame type for which error code is sent 881 * @status - status code mentioning reason 882 */ 883 884static int wpa_tdls_send_error(struct wpa_sm *sm, const u8 *dst, 885 u8 tdls_action, u8 dialog_token, u16 status) 886{ 887 wpa_printf(MSG_DEBUG, "TDLS: Sending error to " MACSTR 888 " (action=%u status=%u)", 889 MAC2STR(dst), tdls_action, status); 890 return wpa_tdls_tpk_send(sm, dst, tdls_action, dialog_token, status, 891 NULL, 0); 892} 893 894 895static struct wpa_tdls_peer * 896wpa_tdls_add_peer(struct wpa_sm *sm, const u8 *addr, int *existing) 897{ 898 struct wpa_tdls_peer *peer; 899 900 if (existing) 901 *existing = 0; 902 for (peer = sm->tdls; peer; peer = peer->next) { 903 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) { 904 if (existing) 905 *existing = 1; 906 return peer; /* re-use existing entry */ 907 } 908 } 909 910 wpa_printf(MSG_INFO, "TDLS: Creating peer entry for " MACSTR, 911 MAC2STR(addr)); 912 913 peer = os_zalloc(sizeof(*peer)); 914 if (peer == NULL) 915 return NULL; 916 917 os_memcpy(peer->addr, addr, ETH_ALEN); 918 peer->next = sm->tdls; 919 sm->tdls = peer; 920 921 return peer; 922} 923 924 925static int wpa_tdls_send_tpk_m1(struct wpa_sm *sm, 926 struct wpa_tdls_peer *peer) 927{ 928 size_t buf_len; 929 struct wpa_tdls_timeoutie timeoutie; 930 u16 rsn_capab; 931 struct wpa_tdls_ftie *ftie; 932 u8 *rbuf, *pos, *count_pos; 933 u16 count; 934 struct rsn_ie_hdr *hdr; 935 936 if (!wpa_tdls_get_privacy(sm)) { 937 wpa_printf(MSG_DEBUG, "TDLS: No security used on the link"); 938 peer->rsnie_i_len = 0; 939 goto skip_rsnie; 940 } 941 942 /* 943 * TPK Handshake Message 1: 944 * FTIE: ANonce=0, SNonce=initiator nonce MIC=0, DataKDs=(RSNIE_I, 945 * Timeout Interval IE)) 946 */ 947 948 /* Filling RSN IE */ 949 hdr = (struct rsn_ie_hdr *) peer->rsnie_i; 950 hdr->elem_id = WLAN_EID_RSN; 951 WPA_PUT_LE16(hdr->version, RSN_VERSION); 952 953 pos = (u8 *) (hdr + 1); 954 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED); 955 pos += RSN_SELECTOR_LEN; 956 count_pos = pos; 957 pos += 2; 958 959 count = 0; 960 961 /* 962 * AES-CCMP is the default Encryption preferred for TDLS, so 963 * RSN IE is filled only with CCMP CIPHER 964 * Note: TKIP is not used to encrypt TDLS link. 965 * 966 * Regardless of the cipher used on the AP connection, select CCMP 967 * here. 968 */ 969 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 970 pos += RSN_SELECTOR_LEN; 971 count++; 972 973 WPA_PUT_LE16(count_pos, count); 974 975 WPA_PUT_LE16(pos, 1); 976 pos += 2; 977 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE); 978 pos += RSN_SELECTOR_LEN; 979 980 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; 981 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2; 982#ifdef CONFIG_TDLS_TESTING 983 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) { 984 wpa_printf(MSG_DEBUG, "TDLS: Use alternative RSN IE for " 985 "testing"); 986 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; 987 } 988#endif /* CONFIG_TDLS_TESTING */ 989 WPA_PUT_LE16(pos, rsn_capab); 990 pos += 2; 991#ifdef CONFIG_TDLS_TESTING 992 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) { 993 /* Number of PMKIDs */ 994 *pos++ = 0x00; 995 *pos++ = 0x00; 996 } 997#endif /* CONFIG_TDLS_TESTING */ 998 999 hdr->len = (pos - peer->rsnie_i) - 2; 1000 peer->rsnie_i_len = pos - peer->rsnie_i; 1001 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake", 1002 peer->rsnie_i, peer->rsnie_i_len); 1003 1004skip_rsnie: 1005 buf_len = 0; 1006 if (wpa_tdls_get_privacy(sm)) 1007 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) + 1008 sizeof(struct wpa_tdls_timeoutie); 1009#ifdef CONFIG_TDLS_TESTING 1010 if (wpa_tdls_get_privacy(sm) && 1011 (tdls_testing & TDLS_TESTING_LONG_FRAME)) 1012 buf_len += 170; 1013 if (tdls_testing & TDLS_TESTING_DIFF_BSSID) 1014 buf_len += sizeof(struct wpa_tdls_lnkid); 1015#endif /* CONFIG_TDLS_TESTING */ 1016 rbuf = os_zalloc(buf_len + 1); 1017 if (rbuf == NULL) { 1018 wpa_tdls_peer_free(sm, peer); 1019 return -1; 1020 } 1021 pos = rbuf; 1022 1023 if (!wpa_tdls_get_privacy(sm)) 1024 goto skip_ies; 1025 1026 /* Initiator RSN IE */ 1027 pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len); 1028 1029 ftie = (struct wpa_tdls_ftie *) pos; 1030 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; 1031 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; 1032 1033 if (os_get_random(peer->inonce, WPA_NONCE_LEN)) { 1034 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1035 "TDLS: Failed to get random data for initiator Nonce"); 1036 os_free(rbuf); 1037 wpa_tdls_peer_free(sm, peer); 1038 return -1; 1039 } 1040 wpa_hexdump(MSG_DEBUG, "TDLS: Initiator Nonce for TPK handshake", 1041 peer->inonce, WPA_NONCE_LEN); 1042 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); 1043 1044 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK Handshake M1", 1045 (u8 *) ftie, sizeof(struct wpa_tdls_ftie)); 1046 1047 pos = (u8 *) (ftie + 1); 1048 1049#ifdef CONFIG_TDLS_TESTING 1050 if (tdls_testing & TDLS_TESTING_LONG_FRAME) { 1051 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " 1052 "FTIE"); 1053 ftie->ie_len += 170; 1054 *pos++ = 255; /* FTIE subelem */ 1055 *pos++ = 168; /* FTIE subelem length */ 1056 pos += 168; 1057 } 1058#endif /* CONFIG_TDLS_TESTING */ 1059 1060 /* Lifetime */ 1061 peer->lifetime = TPK_LIFETIME; 1062#ifdef CONFIG_TDLS_TESTING 1063 if (tdls_testing & TDLS_TESTING_SHORT_LIFETIME) { 1064 wpa_printf(MSG_DEBUG, "TDLS: Testing - use short TPK " 1065 "lifetime"); 1066 peer->lifetime = 301; 1067 } 1068 if (tdls_testing & TDLS_TESTING_LONG_LIFETIME) { 1069 wpa_printf(MSG_DEBUG, "TDLS: Testing - use long TPK " 1070 "lifetime"); 1071 peer->lifetime = 0xffffffff; 1072 } 1073#endif /* CONFIG_TDLS_TESTING */ 1074 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, 1075 sizeof(timeoutie), peer->lifetime); 1076 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime); 1077 1078skip_ies: 1079 1080#ifdef CONFIG_TDLS_TESTING 1081 if (tdls_testing & TDLS_TESTING_DIFF_BSSID) { 1082 wpa_printf(MSG_DEBUG, "TDLS: Testing - use incorrect BSSID in " 1083 "Link Identifier"); 1084 struct wpa_tdls_lnkid *l = (struct wpa_tdls_lnkid *) pos; 1085 wpa_tdls_linkid(sm, peer, l); 1086 l->bssid[5] ^= 0x01; 1087 pos += sizeof(*l); 1088 } 1089#endif /* CONFIG_TDLS_TESTING */ 1090 1091 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Request / TPK " 1092 "Handshake Message 1 (peer " MACSTR ")", 1093 MAC2STR(peer->addr)); 1094 1095 wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_SETUP_REQUEST, 1, 0, 1096 rbuf, pos - rbuf); 1097 os_free(rbuf); 1098 1099 return 0; 1100} 1101 1102 1103static int wpa_tdls_send_tpk_m2(struct wpa_sm *sm, 1104 const unsigned char *src_addr, u8 dtoken, 1105 struct wpa_tdls_lnkid *lnkid, 1106 const struct wpa_tdls_peer *peer) 1107{ 1108 u8 *rbuf, *pos; 1109 size_t buf_len; 1110 u32 lifetime; 1111 struct wpa_tdls_timeoutie timeoutie; 1112 struct wpa_tdls_ftie *ftie; 1113 1114 buf_len = 0; 1115 if (wpa_tdls_get_privacy(sm)) { 1116 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce), 1117 * Lifetime */ 1118 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) + 1119 sizeof(struct wpa_tdls_timeoutie); 1120#ifdef CONFIG_TDLS_TESTING 1121 if (tdls_testing & TDLS_TESTING_LONG_FRAME) 1122 buf_len += 170; 1123#endif /* CONFIG_TDLS_TESTING */ 1124 } 1125 1126 rbuf = os_zalloc(buf_len + 1); 1127 if (rbuf == NULL) 1128 return -1; 1129 pos = rbuf; 1130 1131 if (!wpa_tdls_get_privacy(sm)) 1132 goto skip_ies; 1133 1134 /* Peer RSN IE */ 1135 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len); 1136 1137 ftie = (struct wpa_tdls_ftie *) pos; 1138 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; 1139 /* TODO: ftie->mic_control to set 2-RESPONSE */ 1140 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN); 1141 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); 1142 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; 1143 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK M2", 1144 (u8 *) ftie, sizeof(*ftie)); 1145 1146 pos = (u8 *) (ftie + 1); 1147 1148#ifdef CONFIG_TDLS_TESTING 1149 if (tdls_testing & TDLS_TESTING_LONG_FRAME) { 1150 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " 1151 "FTIE"); 1152 ftie->ie_len += 170; 1153 *pos++ = 255; /* FTIE subelem */ 1154 *pos++ = 168; /* FTIE subelem length */ 1155 pos += 168; 1156 } 1157#endif /* CONFIG_TDLS_TESTING */ 1158 1159 /* Lifetime */ 1160 lifetime = peer->lifetime; 1161#ifdef CONFIG_TDLS_TESTING 1162 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_RESP) { 1163 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK " 1164 "lifetime in response"); 1165 lifetime++; 1166 } 1167#endif /* CONFIG_TDLS_TESTING */ 1168 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, 1169 sizeof(timeoutie), lifetime); 1170 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds from initiator", 1171 lifetime); 1172 1173 /* compute MIC before sending */ 1174 wpa_tdls_ftie_mic(peer->tpk.kck, 2, (u8 *) lnkid, peer->rsnie_p, 1175 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic); 1176 1177skip_ies: 1178 wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0, 1179 rbuf, pos - rbuf); 1180 os_free(rbuf); 1181 1182 return 0; 1183} 1184 1185 1186static int wpa_tdls_send_tpk_m3(struct wpa_sm *sm, 1187 const unsigned char *src_addr, u8 dtoken, 1188 struct wpa_tdls_lnkid *lnkid, 1189 const struct wpa_tdls_peer *peer) 1190{ 1191 u8 *rbuf, *pos; 1192 size_t buf_len; 1193 struct wpa_tdls_ftie *ftie; 1194 struct wpa_tdls_timeoutie timeoutie; 1195 u32 lifetime; 1196 1197 buf_len = 0; 1198 if (wpa_tdls_get_privacy(sm)) { 1199 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce), 1200 * Lifetime */ 1201 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) + 1202 sizeof(struct wpa_tdls_timeoutie); 1203#ifdef CONFIG_TDLS_TESTING 1204 if (tdls_testing & TDLS_TESTING_LONG_FRAME) 1205 buf_len += 170; 1206#endif /* CONFIG_TDLS_TESTING */ 1207 } 1208 1209 rbuf = os_zalloc(buf_len + 1); 1210 if (rbuf == NULL) 1211 return -1; 1212 pos = rbuf; 1213 1214 if (!wpa_tdls_get_privacy(sm)) 1215 goto skip_ies; 1216 1217 /* Peer RSN IE */ 1218 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len); 1219 1220 ftie = (struct wpa_tdls_ftie *) pos; 1221 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; 1222 /*TODO: ftie->mic_control to set 3-CONFIRM */ 1223 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN); 1224 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); 1225 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; 1226 1227 pos = (u8 *) (ftie + 1); 1228 1229#ifdef CONFIG_TDLS_TESTING 1230 if (tdls_testing & TDLS_TESTING_LONG_FRAME) { 1231 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " 1232 "FTIE"); 1233 ftie->ie_len += 170; 1234 *pos++ = 255; /* FTIE subelem */ 1235 *pos++ = 168; /* FTIE subelem length */ 1236 pos += 168; 1237 } 1238#endif /* CONFIG_TDLS_TESTING */ 1239 1240 /* Lifetime */ 1241 lifetime = peer->lifetime; 1242#ifdef CONFIG_TDLS_TESTING 1243 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_CONF) { 1244 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK " 1245 "lifetime in confirm"); 1246 lifetime++; 1247 } 1248#endif /* CONFIG_TDLS_TESTING */ 1249 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, 1250 sizeof(timeoutie), lifetime); 1251 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", 1252 lifetime); 1253 1254 /* compute MIC before sending */ 1255 wpa_tdls_ftie_mic(peer->tpk.kck, 3, (u8 *) lnkid, peer->rsnie_p, 1256 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic); 1257 1258skip_ies: 1259 wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 0, 1260 rbuf, pos - rbuf); 1261 os_free(rbuf); 1262 1263 return 0; 1264} 1265 1266 1267static int wpa_tdls_send_discovery_response(struct wpa_sm *sm, 1268 struct wpa_tdls_peer *peer, 1269 u8 dialog_token) 1270{ 1271 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Discovery Response " 1272 "(peer " MACSTR ")", MAC2STR(peer->addr)); 1273 1274 return wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_DISCOVERY_RESPONSE, 1275 dialog_token, 0, NULL, 0); 1276} 1277 1278 1279static int 1280wpa_tdls_process_discovery_request(struct wpa_sm *sm, const u8 *addr, 1281 const u8 *buf, size_t len) 1282{ 1283 struct wpa_eapol_ie_parse kde; 1284 const struct wpa_tdls_lnkid *lnkid; 1285 struct wpa_tdls_peer *peer; 1286 size_t min_req_len = sizeof(struct wpa_tdls_frame) + 1287 1 /* dialog token */ + sizeof(struct wpa_tdls_lnkid); 1288 u8 dialog_token; 1289 1290 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from " MACSTR, 1291 MAC2STR(addr)); 1292 1293 if (len < min_req_len) { 1294 wpa_printf(MSG_DEBUG, "TDLS Discovery Request is too short: " 1295 "%d", (int) len); 1296 return -1; 1297 } 1298 1299 dialog_token = buf[sizeof(struct wpa_tdls_frame)]; 1300 1301 if (wpa_supplicant_parse_ies(buf + sizeof(struct wpa_tdls_frame) + 1, 1302 len - (sizeof(struct wpa_tdls_frame) + 1), 1303 &kde) < 0) 1304 return -1; 1305 1306 if (!kde.lnkid) { 1307 wpa_printf(MSG_DEBUG, "TDLS: Link ID not found in Discovery " 1308 "Request"); 1309 return -1; 1310 } 1311 1312 lnkid = (const struct wpa_tdls_lnkid *) kde.lnkid; 1313 1314 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { 1315 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from different " 1316 " BSS " MACSTR, MAC2STR(lnkid->bssid)); 1317 return -1; 1318 } 1319 1320 peer = wpa_tdls_add_peer(sm, addr, NULL); 1321 if (peer == NULL) 1322 return -1; 1323 1324 return wpa_tdls_send_discovery_response(sm, peer, dialog_token); 1325} 1326 1327 1328int wpa_tdls_send_discovery_request(struct wpa_sm *sm, const u8 *addr) 1329{ 1330 if (sm->tdls_disabled || !sm->tdls_supported) 1331 return -1; 1332 1333 wpa_printf(MSG_DEBUG, "TDLS: Sending Discovery Request to peer " 1334 MACSTR, MAC2STR(addr)); 1335 return wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_DISCOVERY_REQUEST, 1336 1, 0, NULL, 0); 1337} 1338 1339 1340static int copy_supp_rates(const struct wpa_eapol_ie_parse *kde, 1341 struct wpa_tdls_peer *peer) 1342{ 1343 if (!kde->supp_rates) { 1344 wpa_printf(MSG_DEBUG, "TDLS: No supported rates received"); 1345 return -1; 1346 } 1347 peer->supp_rates_len = merge_byte_arrays( 1348 peer->supp_rates, sizeof(peer->supp_rates), 1349 kde->supp_rates + 2, kde->supp_rates_len - 2, 1350 kde->ext_supp_rates + 2, kde->ext_supp_rates_len - 2); 1351 return 0; 1352} 1353 1354 1355static int copy_peer_ht_capab(const struct wpa_eapol_ie_parse *kde, 1356 struct wpa_tdls_peer *peer) 1357{ 1358 if (!kde->ht_capabilities || 1359 kde->ht_capabilities_len < 1360 sizeof(struct ieee80211_ht_capabilities) ) { 1361 wpa_printf(MSG_DEBUG, "TDLS: No supported ht capabilities " 1362 "received"); 1363 return 0; 1364 } 1365 1366 if (!peer->ht_capabilities) { 1367 peer->ht_capabilities = 1368 os_zalloc(sizeof(struct ieee80211_ht_capabilities)); 1369 if (peer->ht_capabilities == NULL) 1370 return -1; 1371 } 1372 1373 os_memcpy(peer->ht_capabilities, kde->ht_capabilities, 1374 sizeof(struct ieee80211_ht_capabilities)); 1375 wpa_hexdump(MSG_DEBUG, "TDLS: Peer HT capabilities", 1376 (u8 *) peer->ht_capabilities, 1377 sizeof(struct ieee80211_ht_capabilities)); 1378 1379 return 0; 1380} 1381 1382 1383static int copy_peer_vht_capab(const struct wpa_eapol_ie_parse *kde, 1384 struct wpa_tdls_peer *peer) 1385{ 1386 if (!kde->vht_capabilities || 1387 kde->vht_capabilities_len < 1388 sizeof(struct ieee80211_vht_capabilities) ) { 1389 wpa_printf(MSG_DEBUG, "TDLS: No supported vht capabilities " 1390 "received"); 1391 return 0; 1392 } 1393 1394 if (!peer->vht_capabilities) { 1395 peer->vht_capabilities = 1396 os_zalloc(sizeof(struct ieee80211_vht_capabilities)); 1397 if (peer->vht_capabilities == NULL) 1398 return -1; 1399 } 1400 1401 os_memcpy(peer->vht_capabilities, kde->vht_capabilities, 1402 sizeof(struct ieee80211_vht_capabilities)); 1403 wpa_hexdump(MSG_DEBUG, "TDLS: Peer VHT capabilities", 1404 (u8 *) peer->vht_capabilities, 1405 sizeof(struct ieee80211_vht_capabilities)); 1406 1407 return 0; 1408} 1409 1410 1411static int copy_peer_ext_capab(const struct wpa_eapol_ie_parse *kde, 1412 struct wpa_tdls_peer *peer) 1413{ 1414 if (!kde->ext_capab) { 1415 wpa_printf(MSG_DEBUG, "TDLS: No extended capabilities " 1416 "received"); 1417 return 0; 1418 } 1419 1420 if (!peer->ext_capab || peer->ext_capab_len < kde->ext_capab_len - 2) { 1421 /* Need to allocate buffer to fit the new information */ 1422 os_free(peer->ext_capab); 1423 peer->ext_capab = os_zalloc(kde->ext_capab_len - 2); 1424 if (peer->ext_capab == NULL) 1425 return -1; 1426 } 1427 1428 peer->ext_capab_len = kde->ext_capab_len - 2; 1429 os_memcpy(peer->ext_capab, kde->ext_capab + 2, peer->ext_capab_len); 1430 1431 return 0; 1432} 1433 1434 1435static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr, 1436 const u8 *buf, size_t len) 1437{ 1438 struct wpa_tdls_peer *peer; 1439 struct wpa_eapol_ie_parse kde; 1440 struct wpa_ie_data ie; 1441 int cipher; 1442 const u8 *cpos; 1443 struct wpa_tdls_ftie *ftie = NULL; 1444 struct wpa_tdls_timeoutie *timeoutie; 1445 struct wpa_tdls_lnkid *lnkid; 1446 u32 lifetime = 0; 1447#if 0 1448 struct rsn_ie_hdr *hdr; 1449 u8 *pos; 1450 u16 rsn_capab; 1451 u16 rsn_ver; 1452#endif 1453 u8 dtoken; 1454 u16 ielen; 1455 u16 status = WLAN_STATUS_UNSPECIFIED_FAILURE; 1456 int tdls_prohibited = sm->tdls_prohibited; 1457 int existing_peer = 0; 1458 1459 if (len < 3 + 3) 1460 return -1; 1461 1462 cpos = buf; 1463 cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; 1464 1465 /* driver had already verified the frame format */ 1466 dtoken = *cpos++; /* dialog token */ 1467 1468 wpa_printf(MSG_INFO, "TDLS: Dialog Token in TPK M1 %d", dtoken); 1469 1470 peer = wpa_tdls_add_peer(sm, src_addr, &existing_peer); 1471 if (peer == NULL) 1472 goto error; 1473 1474 /* If found, use existing entry instead of adding a new one; 1475 * how to handle the case where both ends initiate at the 1476 * same time? */ 1477 if (existing_peer) { 1478 if (peer->tpk_success) { 1479 wpa_printf(MSG_DEBUG, "TDLS: TDLS Setup Request while " 1480 "direct link is enabled - tear down the " 1481 "old link first"); 1482#if 0 1483 /* TODO: Disabling the link would be more proper 1484 * operation here, but it seems to trigger a race with 1485 * some drivers handling the new request frame. */ 1486 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 1487#else 1488 if (sm->tdls_external_setup) 1489 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, 1490 src_addr); 1491 else 1492 wpa_tdls_del_key(sm, peer); 1493#endif 1494 wpa_tdls_peer_free(sm, peer); 1495 } 1496 1497 /* 1498 * An entry is already present, so check if we already sent a 1499 * TDLS Setup Request. If so, compare MAC addresses and let the 1500 * STA with the lower MAC address continue as the initiator. 1501 * The other negotiation is terminated. 1502 */ 1503 if (peer->initiator) { 1504 if (os_memcmp(sm->own_addr, src_addr, ETH_ALEN) < 0) { 1505 wpa_printf(MSG_DEBUG, "TDLS: Discard request " 1506 "from peer with higher address " 1507 MACSTR, MAC2STR(src_addr)); 1508 return -1; 1509 } else { 1510 wpa_printf(MSG_DEBUG, "TDLS: Accept request " 1511 "from peer with lower address " 1512 MACSTR " (terminate previously " 1513 "initiated negotiation", 1514 MAC2STR(src_addr)); 1515 if (sm->tdls_external_setup) 1516 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, 1517 src_addr); 1518 else 1519 wpa_tdls_del_key(sm, peer); 1520 wpa_tdls_peer_free(sm, peer); 1521 } 1522 } 1523 } 1524 1525 /* capability information */ 1526 peer->capability = WPA_GET_LE16(cpos); 1527 cpos += 2; 1528 1529 ielen = len - (cpos - buf); /* start of IE in buf */ 1530 if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0) { 1531 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M1"); 1532 goto error; 1533 } 1534 1535 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { 1536 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in " 1537 "TPK M1"); 1538 goto error; 1539 } 1540 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M1", 1541 kde.lnkid, kde.lnkid_len); 1542 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; 1543 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { 1544 wpa_printf(MSG_INFO, "TDLS: TPK M1 from diff BSS"); 1545 status = WLAN_STATUS_NOT_IN_SAME_BSS; 1546 goto error; 1547 } 1548 1549 wpa_printf(MSG_DEBUG, "TDLS: TPK M1 - TPK initiator " MACSTR, 1550 MAC2STR(src_addr)); 1551 1552 if (copy_supp_rates(&kde, peer) < 0) 1553 goto error; 1554 1555 if (copy_peer_ht_capab(&kde, peer) < 0) 1556 goto error; 1557 1558 if (copy_peer_vht_capab(&kde, peer) < 0) 1559 goto error; 1560 1561 if (copy_peer_ext_capab(&kde, peer) < 0) 1562 goto error; 1563 1564 peer->qos_info = kde.qosinfo; 1565 1566 peer->aid = kde.aid; 1567 1568#ifdef CONFIG_TDLS_TESTING 1569 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) { 1570 peer = wpa_tdls_add_peer(sm, src_addr, NULL); 1571 if (peer == NULL) 1572 goto error; 1573 wpa_printf(MSG_DEBUG, "TDLS: Testing concurrent initiation of " 1574 "TDLS setup - send own request"); 1575 peer->initiator = 1; 1576 wpa_tdls_send_tpk_m1(sm, peer); 1577 } 1578 1579 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) && 1580 tdls_prohibited) { 1581 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition " 1582 "on TDLS"); 1583 tdls_prohibited = 0; 1584 } 1585#endif /* CONFIG_TDLS_TESTING */ 1586 1587 if (tdls_prohibited) { 1588 wpa_printf(MSG_INFO, "TDLS: TDLS prohibited in this BSS"); 1589 status = WLAN_STATUS_REQUEST_DECLINED; 1590 goto error; 1591 } 1592 1593 if (!wpa_tdls_get_privacy(sm)) { 1594 if (kde.rsn_ie) { 1595 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M1 while " 1596 "security is disabled"); 1597 status = WLAN_STATUS_SECURITY_DISABLED; 1598 goto error; 1599 } 1600 goto skip_rsn; 1601 } 1602 1603 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) || 1604 kde.rsn_ie == NULL) { 1605 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M1"); 1606 status = WLAN_STATUS_INVALID_PARAMETERS; 1607 goto error; 1608 } 1609 1610 if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) { 1611 wpa_printf(MSG_INFO, "TDLS: Too long Initiator RSN IE in " 1612 "TPK M1"); 1613 status = WLAN_STATUS_INVALID_RSNIE; 1614 goto error; 1615 } 1616 1617 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) { 1618 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M1"); 1619 status = WLAN_STATUS_INVALID_RSNIE; 1620 goto error; 1621 } 1622 1623 cipher = ie.pairwise_cipher; 1624 if (cipher & WPA_CIPHER_CCMP) { 1625 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link"); 1626 cipher = WPA_CIPHER_CCMP; 1627 } else { 1628 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M1"); 1629 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID; 1630 goto error; 1631 } 1632 1633 if ((ie.capabilities & 1634 (WPA_CAPABILITY_NO_PAIRWISE | WPA_CAPABILITY_PEERKEY_ENABLED)) != 1635 WPA_CAPABILITY_PEERKEY_ENABLED) { 1636 wpa_printf(MSG_INFO, "TDLS: Invalid RSN Capabilities in " 1637 "TPK M1"); 1638 status = WLAN_STATUS_INVALID_RSN_IE_CAPAB; 1639 goto error; 1640 } 1641 1642 /* Lifetime */ 1643 if (kde.key_lifetime == NULL) { 1644 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1"); 1645 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; 1646 goto error; 1647 } 1648 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime; 1649 lifetime = WPA_GET_LE32(timeoutie->value); 1650 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime); 1651 if (lifetime < 300) { 1652 wpa_printf(MSG_INFO, "TDLS: Too short TPK lifetime"); 1653 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; 1654 goto error; 1655 } 1656 1657skip_rsn: 1658#ifdef CONFIG_TDLS_TESTING 1659 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) { 1660 if (os_memcmp(sm->own_addr, peer->addr, ETH_ALEN) < 0) { 1661 /* 1662 * The request frame from us is going to win, so do not 1663 * replace information based on this request frame from 1664 * the peer. 1665 */ 1666 goto skip_rsn_check; 1667 } 1668 } 1669#endif /* CONFIG_TDLS_TESTING */ 1670 1671 peer->initiator = 0; /* Need to check */ 1672 peer->dtoken = dtoken; 1673 1674 if (!wpa_tdls_get_privacy(sm)) { 1675 peer->rsnie_i_len = 0; 1676 peer->rsnie_p_len = 0; 1677 peer->cipher = WPA_CIPHER_NONE; 1678 goto skip_rsn_check; 1679 } 1680 1681 ftie = (struct wpa_tdls_ftie *) kde.ftie; 1682 os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN); 1683 os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len); 1684 peer->rsnie_i_len = kde.rsn_ie_len; 1685 peer->cipher = cipher; 1686 1687 if (os_get_random(peer->rnonce, WPA_NONCE_LEN)) { 1688 wpa_msg(sm->ctx->ctx, MSG_WARNING, 1689 "TDLS: Failed to get random data for responder nonce"); 1690 wpa_tdls_peer_free(sm, peer); 1691 goto error; 1692 } 1693 1694#if 0 1695 /* get version info from RSNIE received from Peer */ 1696 hdr = (struct rsn_ie_hdr *) kde.rsn_ie; 1697 rsn_ver = WPA_GET_LE16(hdr->version); 1698 1699 /* use min(peer's version, out version) */ 1700 if (rsn_ver > RSN_VERSION) 1701 rsn_ver = RSN_VERSION; 1702 1703 hdr = (struct rsn_ie_hdr *) peer->rsnie_p; 1704 1705 hdr->elem_id = WLAN_EID_RSN; 1706 WPA_PUT_LE16(hdr->version, rsn_ver); 1707 pos = (u8 *) (hdr + 1); 1708 1709 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED); 1710 pos += RSN_SELECTOR_LEN; 1711 /* Include only the selected cipher in pairwise cipher suite */ 1712 WPA_PUT_LE16(pos, 1); 1713 pos += 2; 1714 if (cipher == WPA_CIPHER_CCMP) 1715 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 1716 pos += RSN_SELECTOR_LEN; 1717 1718 WPA_PUT_LE16(pos, 1); 1719 pos += 2; 1720 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE); 1721 pos += RSN_SELECTOR_LEN; 1722 1723 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; 1724 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2; 1725 WPA_PUT_LE16(pos, rsn_capab); 1726 pos += 2; 1727 1728 hdr->len = (pos - peer->rsnie_p) - 2; 1729 peer->rsnie_p_len = pos - peer->rsnie_p; 1730#endif 1731 1732 /* temp fix: validation of RSNIE later */ 1733 os_memcpy(peer->rsnie_p, peer->rsnie_i, peer->rsnie_i_len); 1734 peer->rsnie_p_len = peer->rsnie_i_len; 1735 1736 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake", 1737 peer->rsnie_p, peer->rsnie_p_len); 1738 1739 peer->lifetime = lifetime; 1740 1741 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid); 1742 1743skip_rsn_check: 1744 /* add the peer to the driver as a "setup in progress" peer */ 1745 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL, NULL, 0, 1746 NULL, 0); 1747 1748 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Response / TPK M2"); 1749 if (wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer) < 0) { 1750 wpa_tdls_disable_link(sm, peer->addr); 1751 goto error; 1752 } 1753 1754 return 0; 1755 1756error: 1757 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 1758 status); 1759 return -1; 1760} 1761 1762 1763static int wpa_tdls_enable_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 1764{ 1765 peer->tpk_success = 1; 1766 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer); 1767 if (wpa_tdls_get_privacy(sm)) { 1768 u32 lifetime = peer->lifetime; 1769 /* 1770 * Start the initiator process a bit earlier to avoid race 1771 * condition with the responder sending teardown request. 1772 */ 1773 if (lifetime > 3 && peer->initiator) 1774 lifetime -= 3; 1775 eloop_register_timeout(lifetime, 0, wpa_tdls_tpk_timeout, 1776 sm, peer); 1777#ifdef CONFIG_TDLS_TESTING 1778 if (tdls_testing & TDLS_TESTING_NO_TPK_EXPIRATION) { 1779 wpa_printf(MSG_DEBUG, "TDLS: Testing - disable TPK " 1780 "expiration"); 1781 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer); 1782 } 1783#endif /* CONFIG_TDLS_TESTING */ 1784 } 1785 1786 /* add supported rates, capabilities, and qos_info to the TDLS peer */ 1787 if (wpa_sm_tdls_peer_addset(sm, peer->addr, 0, peer->aid, 1788 peer->capability, 1789 peer->supp_rates, peer->supp_rates_len, 1790 peer->ht_capabilities, 1791 peer->vht_capabilities, 1792 peer->qos_info, peer->ext_capab, 1793 peer->ext_capab_len) < 0) 1794 return -1; 1795 1796 if (peer->reconfig_key && wpa_tdls_set_key(sm, peer) < 0) { 1797 wpa_printf(MSG_INFO, "TDLS: Could not configure key to the " 1798 "driver"); 1799 return -1; 1800 } 1801 peer->reconfig_key = 0; 1802 1803 return wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, peer->addr); 1804} 1805 1806 1807static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr, 1808 const u8 *buf, size_t len) 1809{ 1810 struct wpa_tdls_peer *peer; 1811 struct wpa_eapol_ie_parse kde; 1812 struct wpa_ie_data ie; 1813 int cipher; 1814 struct wpa_tdls_ftie *ftie; 1815 struct wpa_tdls_timeoutie *timeoutie; 1816 struct wpa_tdls_lnkid *lnkid; 1817 u32 lifetime; 1818 u8 dtoken; 1819 int ielen; 1820 u16 status; 1821 const u8 *pos; 1822 int ret; 1823 1824 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Response / TPK M2 " 1825 "(Peer " MACSTR ")", MAC2STR(src_addr)); 1826 for (peer = sm->tdls; peer; peer = peer->next) { 1827 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) 1828 break; 1829 } 1830 if (peer == NULL) { 1831 wpa_printf(MSG_INFO, "TDLS: No matching peer found for " 1832 "TPK M2: " MACSTR, MAC2STR(src_addr)); 1833 return -1; 1834 } 1835 if (!peer->initiator) { 1836 /* 1837 * This may happen if both devices try to initiate TDLS at the 1838 * same time and we accept the TPK M1 from the peer in 1839 * wpa_tdls_process_tpk_m1() and clear our previous state. 1840 */ 1841 wpa_printf(MSG_INFO, "TDLS: We were not the initiator, so " 1842 "ignore TPK M2 from " MACSTR, MAC2STR(src_addr)); 1843 return -1; 1844 } 1845 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_REQUEST); 1846 1847 if (len < 3 + 2 + 1) 1848 return -1; 1849 pos = buf; 1850 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; 1851 status = WPA_GET_LE16(pos); 1852 pos += 2 /* status code */; 1853 1854 if (status != WLAN_STATUS_SUCCESS) { 1855 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M2: %u", 1856 status); 1857 if (sm->tdls_external_setup) 1858 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 1859 return -1; 1860 } 1861 1862 status = WLAN_STATUS_UNSPECIFIED_FAILURE; 1863 1864 /* TODO: need to verify dialog token matches here or in kernel */ 1865 dtoken = *pos++; /* dialog token */ 1866 1867 wpa_printf(MSG_DEBUG, "TDLS: Dialog Token in TPK M2 %d", dtoken); 1868 1869 if (len < 3 + 2 + 1 + 2) 1870 return -1; 1871 1872 /* capability information */ 1873 peer->capability = WPA_GET_LE16(pos); 1874 pos += 2; 1875 1876 ielen = len - (pos - buf); /* start of IE in buf */ 1877 if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0) { 1878 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M2"); 1879 goto error; 1880 } 1881 1882#ifdef CONFIG_TDLS_TESTING 1883 if (tdls_testing & TDLS_TESTING_DECLINE_RESP) { 1884 wpa_printf(MSG_DEBUG, "TDLS: Testing - decline response"); 1885 status = WLAN_STATUS_REQUEST_DECLINED; 1886 goto error; 1887 } 1888#endif /* CONFIG_TDLS_TESTING */ 1889 1890 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { 1891 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in " 1892 "TPK M2"); 1893 goto error; 1894 } 1895 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M2", 1896 kde.lnkid, kde.lnkid_len); 1897 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; 1898 1899 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { 1900 wpa_printf(MSG_INFO, "TDLS: TPK M2 from different BSS"); 1901 status = WLAN_STATUS_NOT_IN_SAME_BSS; 1902 goto error; 1903 } 1904 1905 if (copy_supp_rates(&kde, peer) < 0) 1906 goto error; 1907 1908 if (copy_peer_ht_capab(&kde, peer) < 0) 1909 goto error; 1910 1911 if (copy_peer_vht_capab(&kde, peer) < 0) 1912 goto error; 1913 1914 if (copy_peer_ext_capab(&kde, peer) < 0) 1915 goto error; 1916 1917 peer->qos_info = kde.qosinfo; 1918 1919 peer->aid = kde.aid; 1920 1921 if (!wpa_tdls_get_privacy(sm)) { 1922 peer->rsnie_p_len = 0; 1923 peer->cipher = WPA_CIPHER_NONE; 1924 goto skip_rsn; 1925 } 1926 1927 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) || 1928 kde.rsn_ie == NULL) { 1929 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M2"); 1930 status = WLAN_STATUS_INVALID_PARAMETERS; 1931 goto error; 1932 } 1933 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2", 1934 kde.rsn_ie, kde.rsn_ie_len); 1935 1936 /* 1937 * FIX: bitwise comparison of RSN IE is not the correct way of 1938 * validation this. It can be different, but certain fields must 1939 * match. Since we list only a single pairwise cipher in TPK M1, the 1940 * memcmp is likely to work in most cases, though. 1941 */ 1942 if (kde.rsn_ie_len != peer->rsnie_i_len || 1943 os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) != 0) { 1944 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M2 does " 1945 "not match with RSN IE used in TPK M1"); 1946 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Sent in TPK M1", 1947 peer->rsnie_i, peer->rsnie_i_len); 1948 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2", 1949 kde.rsn_ie, kde.rsn_ie_len); 1950 status = WLAN_STATUS_INVALID_RSNIE; 1951 goto error; 1952 } 1953 1954 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) { 1955 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M2"); 1956 status = WLAN_STATUS_INVALID_RSNIE; 1957 goto error; 1958 } 1959 1960 cipher = ie.pairwise_cipher; 1961 if (cipher == WPA_CIPHER_CCMP) { 1962 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link"); 1963 cipher = WPA_CIPHER_CCMP; 1964 } else { 1965 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M2"); 1966 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID; 1967 goto error; 1968 } 1969 1970 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M2", 1971 kde.ftie, sizeof(*ftie)); 1972 ftie = (struct wpa_tdls_ftie *) kde.ftie; 1973 1974 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) { 1975 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does " 1976 "not match with FTIE SNonce used in TPK M1"); 1977 /* Silently discard the frame */ 1978 return -1; 1979 } 1980 1981 /* Responder Nonce and RSN IE */ 1982 os_memcpy(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN); 1983 os_memcpy(peer->rsnie_p, kde.rsn_ie, kde.rsn_ie_len); 1984 peer->rsnie_p_len = kde.rsn_ie_len; 1985 peer->cipher = cipher; 1986 1987 /* Lifetime */ 1988 if (kde.key_lifetime == NULL) { 1989 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M2"); 1990 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; 1991 goto error; 1992 } 1993 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime; 1994 lifetime = WPA_GET_LE32(timeoutie->value); 1995 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M2", 1996 lifetime); 1997 if (lifetime != peer->lifetime) { 1998 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in " 1999 "TPK M2 (expected %u)", lifetime, peer->lifetime); 2000 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; 2001 goto error; 2002 } 2003 2004 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid); 2005 2006 /* Process MIC check to see if TPK M2 is right */ 2007 if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid, 2008 (u8 *) timeoutie, ftie) < 0) { 2009 /* Discard the frame */ 2010 wpa_tdls_del_key(sm, peer); 2011 wpa_tdls_peer_free(sm, peer); 2012 if (sm->tdls_external_setup) 2013 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 2014 return -1; 2015 } 2016 2017 if (wpa_tdls_set_key(sm, peer) < 0) { 2018 /* 2019 * Some drivers may not be able to config the key prior to full 2020 * STA entry having been configured. 2021 */ 2022 wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after " 2023 "STA entry is complete"); 2024 peer->reconfig_key = 1; 2025 } 2026 2027skip_rsn: 2028 peer->dtoken = dtoken; 2029 2030 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Confirm / " 2031 "TPK Handshake Message 3"); 2032 wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer); 2033 2034 ret = wpa_tdls_enable_link(sm, peer); 2035 if (ret < 0) { 2036 wpa_printf(MSG_DEBUG, "TDLS: Could not enable link"); 2037 wpa_tdls_do_teardown(sm, peer, 2038 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1); 2039 } 2040 return ret; 2041 2042error: 2043 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 2044 status); 2045 if (sm->tdls_external_setup) 2046 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 2047 return -1; 2048} 2049 2050 2051static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr, 2052 const u8 *buf, size_t len) 2053{ 2054 struct wpa_tdls_peer *peer; 2055 struct wpa_eapol_ie_parse kde; 2056 struct wpa_tdls_ftie *ftie; 2057 struct wpa_tdls_timeoutie *timeoutie; 2058 struct wpa_tdls_lnkid *lnkid; 2059 int ielen; 2060 u16 status; 2061 const u8 *pos; 2062 u32 lifetime; 2063 int ret; 2064 2065 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Confirm / TPK M3 " 2066 "(Peer " MACSTR ")", MAC2STR(src_addr)); 2067 for (peer = sm->tdls; peer; peer = peer->next) { 2068 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) 2069 break; 2070 } 2071 if (peer == NULL) { 2072 wpa_printf(MSG_INFO, "TDLS: No matching peer found for " 2073 "TPK M3: " MACSTR, MAC2STR(src_addr)); 2074 return -1; 2075 } 2076 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_RESPONSE); 2077 2078 if (len < 3 + 3) 2079 return -1; 2080 pos = buf; 2081 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; 2082 2083 status = WPA_GET_LE16(pos); 2084 2085 if (status != 0) { 2086 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M3: %u", 2087 status); 2088 if (sm->tdls_external_setup) 2089 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 2090 return -1; 2091 } 2092 pos += 2 /* status code */ + 1 /* dialog token */; 2093 2094 ielen = len - (pos - buf); /* start of IE in buf */ 2095 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) { 2096 wpa_printf(MSG_INFO, "TDLS: Failed to parse KDEs in TPK M3"); 2097 return -1; 2098 } 2099 2100 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { 2101 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M3"); 2102 return -1; 2103 } 2104 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M3", 2105 (u8 *) kde.lnkid, kde.lnkid_len); 2106 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; 2107 2108 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { 2109 wpa_printf(MSG_INFO, "TDLS: TPK M3 from diff BSS"); 2110 return -1; 2111 } 2112 2113 if (!wpa_tdls_get_privacy(sm)) 2114 goto skip_rsn; 2115 2116 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) { 2117 wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M3"); 2118 return -1; 2119 } 2120 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M3", 2121 kde.ftie, sizeof(*ftie)); 2122 ftie = (struct wpa_tdls_ftie *) kde.ftie; 2123 2124 if (kde.rsn_ie == NULL) { 2125 wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M3"); 2126 return -1; 2127 } 2128 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M3", 2129 kde.rsn_ie, kde.rsn_ie_len); 2130 if (kde.rsn_ie_len != peer->rsnie_p_len || 2131 os_memcmp(kde.rsn_ie, peer->rsnie_p, peer->rsnie_p_len) != 0) { 2132 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M3 does not match " 2133 "with the one sent in TPK M2"); 2134 return -1; 2135 } 2136 2137 if (!os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) { 2138 wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does " 2139 "not match with FTIE ANonce used in TPK M2"); 2140 return -1; 2141 } 2142 2143 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) { 2144 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M3 does not " 2145 "match with FTIE SNonce used in TPK M1"); 2146 return -1; 2147 } 2148 2149 if (kde.key_lifetime == NULL) { 2150 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M3"); 2151 return -1; 2152 } 2153 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime; 2154 wpa_hexdump(MSG_DEBUG, "TDLS: Timeout IE Received from TPK M3", 2155 (u8 *) timeoutie, sizeof(*timeoutie)); 2156 lifetime = WPA_GET_LE32(timeoutie->value); 2157 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M3", 2158 lifetime); 2159 if (lifetime != peer->lifetime) { 2160 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in " 2161 "TPK M3 (expected %u)", lifetime, peer->lifetime); 2162 if (sm->tdls_external_setup) 2163 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr); 2164 return -1; 2165 } 2166 2167 if (wpa_supplicant_verify_tdls_mic(3, peer, (u8 *) lnkid, 2168 (u8 *) timeoutie, ftie) < 0) { 2169 wpa_tdls_del_key(sm, peer); 2170 wpa_tdls_peer_free(sm, peer); 2171 return -1; 2172 } 2173 2174 if (wpa_tdls_set_key(sm, peer) < 0) { 2175 /* 2176 * Some drivers may not be able to config the key prior to full 2177 * STA entry having been configured. 2178 */ 2179 wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after " 2180 "STA entry is complete"); 2181 peer->reconfig_key = 1; 2182 } 2183 2184skip_rsn: 2185 ret = wpa_tdls_enable_link(sm, peer); 2186 if (ret < 0) { 2187 wpa_printf(MSG_DEBUG, "TDLS: Could not enable link"); 2188 wpa_tdls_do_teardown(sm, peer, 2189 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1); 2190 } 2191 return ret; 2192} 2193 2194 2195static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs) 2196{ 2197 struct wpa_tdls_timeoutie *lifetime = (struct wpa_tdls_timeoutie *) ie; 2198 2199 os_memset(lifetime, 0, ie_len); 2200 lifetime->ie_type = WLAN_EID_TIMEOUT_INTERVAL; 2201 lifetime->ie_len = sizeof(struct wpa_tdls_timeoutie) - 2; 2202 lifetime->interval_type = WLAN_TIMEOUT_KEY_LIFETIME; 2203 WPA_PUT_LE32(lifetime->value, tsecs); 2204 os_memcpy(pos, ie, ie_len); 2205 return pos + ie_len; 2206} 2207 2208 2209/** 2210 * wpa_tdls_start - Initiate TDLS handshake (send TPK Handshake Message 1) 2211 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2212 * @peer: MAC address of the peer STA 2213 * Returns: 0 on success, or -1 on failure 2214 * 2215 * Send TPK Handshake Message 1 info to driver to start TDLS 2216 * handshake with the peer. 2217 */ 2218int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr) 2219{ 2220 struct wpa_tdls_peer *peer; 2221 int tdls_prohibited = sm->tdls_prohibited; 2222 2223 if (sm->tdls_disabled || !sm->tdls_supported) 2224 return -1; 2225 2226#ifdef CONFIG_TDLS_TESTING 2227 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) && 2228 tdls_prohibited) { 2229 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition " 2230 "on TDLS"); 2231 tdls_prohibited = 0; 2232 } 2233#endif /* CONFIG_TDLS_TESTING */ 2234 2235 if (tdls_prohibited) { 2236 wpa_printf(MSG_DEBUG, "TDLS: TDLS is prohibited in this BSS - " 2237 "reject request to start setup"); 2238 return -1; 2239 } 2240 2241 peer = wpa_tdls_add_peer(sm, addr, NULL); 2242 if (peer == NULL) 2243 return -1; 2244 2245 peer->initiator = 1; 2246 2247 /* add the peer to the driver as a "setup in progress" peer */ 2248 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL, NULL, 0, 2249 NULL, 0); 2250 2251 if (wpa_tdls_send_tpk_m1(sm, peer) < 0) { 2252 wpa_tdls_disable_link(sm, peer->addr); 2253 return -1; 2254 } 2255 2256 return 0; 2257} 2258 2259 2260void wpa_tdls_remove(struct wpa_sm *sm, const u8 *addr) 2261{ 2262 struct wpa_tdls_peer *peer; 2263 2264 if (sm->tdls_disabled || !sm->tdls_supported) 2265 return; 2266 2267 for (peer = sm->tdls; peer; peer = peer->next) { 2268 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 2269 break; 2270 } 2271 2272 if (peer == NULL || !peer->tpk_success) 2273 return; 2274 2275 if (sm->tdls_external_setup) { 2276 /* 2277 * Disable previous link to allow renegotiation to be completed 2278 * on AP path. 2279 */ 2280 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); 2281 } 2282} 2283 2284 2285/** 2286 * wpa_supplicant_rx_tdls - Receive TDLS data frame 2287 * 2288 * This function is called to receive TDLS (ethertype = 0x890d) data frames. 2289 */ 2290static void wpa_supplicant_rx_tdls(void *ctx, const u8 *src_addr, 2291 const u8 *buf, size_t len) 2292{ 2293 struct wpa_sm *sm = ctx; 2294 struct wpa_tdls_frame *tf; 2295 2296 wpa_hexdump(MSG_DEBUG, "TDLS: Received Data frame encapsulation", 2297 buf, len); 2298 2299 if (sm->tdls_disabled || !sm->tdls_supported) { 2300 wpa_printf(MSG_DEBUG, "TDLS: Discard message - TDLS disabled " 2301 "or unsupported by driver"); 2302 return; 2303 } 2304 2305 if (os_memcmp(src_addr, sm->own_addr, ETH_ALEN) == 0) { 2306 wpa_printf(MSG_DEBUG, "TDLS: Discard copy of own message"); 2307 return; 2308 } 2309 2310 if (len < sizeof(*tf)) { 2311 wpa_printf(MSG_INFO, "TDLS: Drop too short frame"); 2312 return; 2313 } 2314 2315 /* Check to make sure its a valid encapsulated TDLS frame */ 2316 tf = (struct wpa_tdls_frame *) buf; 2317 if (tf->payloadtype != 2 /* TDLS_RFTYPE */ || 2318 tf->category != WLAN_ACTION_TDLS) { 2319 wpa_printf(MSG_INFO, "TDLS: Invalid frame - payloadtype=%u " 2320 "category=%u action=%u", 2321 tf->payloadtype, tf->category, tf->action); 2322 return; 2323 } 2324 2325 switch (tf->action) { 2326 case WLAN_TDLS_SETUP_REQUEST: 2327 wpa_tdls_process_tpk_m1(sm, src_addr, buf, len); 2328 break; 2329 case WLAN_TDLS_SETUP_RESPONSE: 2330 wpa_tdls_process_tpk_m2(sm, src_addr, buf, len); 2331 break; 2332 case WLAN_TDLS_SETUP_CONFIRM: 2333 wpa_tdls_process_tpk_m3(sm, src_addr, buf, len); 2334 break; 2335 case WLAN_TDLS_TEARDOWN: 2336 wpa_tdls_recv_teardown(sm, src_addr, buf, len); 2337 break; 2338 case WLAN_TDLS_DISCOVERY_REQUEST: 2339 wpa_tdls_process_discovery_request(sm, src_addr, buf, len); 2340 break; 2341 default: 2342 /* Kernel code will process remaining frames */ 2343 wpa_printf(MSG_DEBUG, "TDLS: Ignore TDLS frame action code %u", 2344 tf->action); 2345 break; 2346 } 2347} 2348 2349 2350/** 2351 * wpa_tdls_init - Initialize driver interface parameters for TDLS 2352 * @wpa_s: Pointer to wpa_supplicant data 2353 * Returns: 0 on success, -1 on failure 2354 * 2355 * This function is called to initialize driver interface parameters for TDLS. 2356 * wpa_drv_init() must have been called before this function to initialize the 2357 * driver interface. 2358 */ 2359int wpa_tdls_init(struct wpa_sm *sm) 2360{ 2361 if (sm == NULL) 2362 return -1; 2363 2364 sm->l2_tdls = l2_packet_init(sm->bridge_ifname ? sm->bridge_ifname : 2365 sm->ifname, 2366 sm->own_addr, 2367 ETH_P_80211_ENCAP, wpa_supplicant_rx_tdls, 2368 sm, 0); 2369 if (sm->l2_tdls == NULL) { 2370 wpa_printf(MSG_ERROR, "TDLS: Failed to open l2_packet " 2371 "connection"); 2372 return -1; 2373 } 2374 2375 /* 2376 * Drivers that support TDLS but don't implement the get_capa callback 2377 * are assumed to perform everything internally 2378 */ 2379 if (wpa_sm_tdls_get_capa(sm, &sm->tdls_supported, 2380 &sm->tdls_external_setup) < 0) { 2381 sm->tdls_supported = 1; 2382 sm->tdls_external_setup = 0; 2383 } 2384 2385 wpa_printf(MSG_DEBUG, "TDLS: TDLS operation%s supported by " 2386 "driver", sm->tdls_supported ? "" : " not"); 2387 wpa_printf(MSG_DEBUG, "TDLS: Driver uses %s link setup", 2388 sm->tdls_external_setup ? "external" : "internal"); 2389 2390 return 0; 2391} 2392 2393 2394void wpa_tdls_teardown_peers(struct wpa_sm *sm) 2395{ 2396 struct wpa_tdls_peer *peer; 2397 2398 peer = sm->tdls; 2399 2400 wpa_printf(MSG_DEBUG, "TDLS: Tear down peers"); 2401 2402 while (peer) { 2403 wpa_printf(MSG_DEBUG, "TDLS: Tear down peer " MACSTR, 2404 MAC2STR(peer->addr)); 2405 if (sm->tdls_external_setup) 2406 wpa_tdls_send_teardown(sm, peer->addr, 2407 WLAN_REASON_DEAUTH_LEAVING); 2408 else 2409 wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr); 2410 2411 peer = peer->next; 2412 } 2413} 2414 2415 2416static void wpa_tdls_remove_peers(struct wpa_sm *sm) 2417{ 2418 struct wpa_tdls_peer *peer, *tmp; 2419 2420 peer = sm->tdls; 2421 sm->tdls = NULL; 2422 2423 while (peer) { 2424 int res; 2425 tmp = peer->next; 2426 res = wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); 2427 wpa_printf(MSG_DEBUG, "TDLS: Remove peer " MACSTR " (res=%d)", 2428 MAC2STR(peer->addr), res); 2429 wpa_tdls_peer_free(sm, peer); 2430 os_free(peer); 2431 peer = tmp; 2432 } 2433} 2434 2435 2436/** 2437 * wpa_tdls_deinit - Deinitialize driver interface parameters for TDLS 2438 * 2439 * This function is called to recover driver interface parameters for TDLS 2440 * and frees resources allocated for it. 2441 */ 2442void wpa_tdls_deinit(struct wpa_sm *sm) 2443{ 2444 if (sm == NULL) 2445 return; 2446 2447 if (sm->l2_tdls) 2448 l2_packet_deinit(sm->l2_tdls); 2449 sm->l2_tdls = NULL; 2450 2451 wpa_tdls_remove_peers(sm); 2452} 2453 2454 2455void wpa_tdls_assoc(struct wpa_sm *sm) 2456{ 2457 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on association"); 2458 wpa_tdls_remove_peers(sm); 2459} 2460 2461 2462void wpa_tdls_disassoc(struct wpa_sm *sm) 2463{ 2464 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on disassociation"); 2465 wpa_tdls_remove_peers(sm); 2466} 2467 2468 2469static int wpa_tdls_prohibited(const u8 *ies, size_t len) 2470{ 2471 struct wpa_eapol_ie_parse elems; 2472 2473 if (ies == NULL) 2474 return 0; 2475 2476 if (wpa_supplicant_parse_ies(ies, len, &elems) < 0) 2477 return 0; 2478 2479 if (elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5) 2480 return 0; 2481 2482 /* bit 38 - TDLS Prohibited */ 2483 return !!(elems.ext_capab[2 + 4] & 0x40); 2484} 2485 2486 2487void wpa_tdls_ap_ies(struct wpa_sm *sm, const u8 *ies, size_t len) 2488{ 2489 sm->tdls_prohibited = wpa_tdls_prohibited(ies, len); 2490 wpa_printf(MSG_DEBUG, "TDLS: TDLS is %s in the target BSS", 2491 sm->tdls_prohibited ? "prohibited" : "allowed"); 2492} 2493 2494 2495void wpa_tdls_assoc_resp_ies(struct wpa_sm *sm, const u8 *ies, size_t len) 2496{ 2497 if (!sm->tdls_prohibited && wpa_tdls_prohibited(ies, len)) { 2498 wpa_printf(MSG_DEBUG, "TDLS: TDLS prohibited based on " 2499 "(Re)Association Response IEs"); 2500 sm->tdls_prohibited = 1; 2501 } 2502} 2503 2504 2505void wpa_tdls_enable(struct wpa_sm *sm, int enabled) 2506{ 2507 wpa_printf(MSG_DEBUG, "TDLS: %s", enabled ? "enabled" : "disabled"); 2508 sm->tdls_disabled = !enabled; 2509} 2510 2511 2512int wpa_tdls_is_external_setup(struct wpa_sm *sm) 2513{ 2514 return sm->tdls_external_setup; 2515} 2516