tdls.c revision 7f65602d49069f96a7bb44da8bd79ffe8d4c6a98
1/* 2 * wpa_supplicant - TDLS 3 * Copyright (c) 2010-2011, Atheros Communications 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9#include "utils/includes.h" 10 11#include "utils/common.h" 12#include "utils/eloop.h" 13#include "utils/os.h" 14#include "common/ieee802_11_defs.h" 15#include "crypto/sha256.h" 16#include "crypto/crypto.h" 17#include "crypto/aes_wrap.h" 18#include "rsn_supp/wpa.h" 19#include "rsn_supp/wpa_ie.h" 20#include "rsn_supp/wpa_i.h" 21#include "drivers/driver.h" 22#include "l2_packet/l2_packet.h" 23 24#ifdef CONFIG_TDLS_TESTING 25#define TDLS_TESTING_LONG_FRAME BIT(0) 26#define TDLS_TESTING_ALT_RSN_IE BIT(1) 27#define TDLS_TESTING_DIFF_BSSID BIT(2) 28#define TDLS_TESTING_SHORT_LIFETIME BIT(3) 29#define TDLS_TESTING_WRONG_LIFETIME_RESP BIT(4) 30#define TDLS_TESTING_WRONG_LIFETIME_CONF BIT(5) 31#define TDLS_TESTING_LONG_LIFETIME BIT(6) 32#define TDLS_TESTING_CONCURRENT_INIT BIT(7) 33#define TDLS_TESTING_NO_TPK_EXPIRATION BIT(8) 34#define TDLS_TESTING_DECLINE_RESP BIT(9) 35#define TDLS_TESTING_IGNORE_AP_PROHIBIT BIT(10) 36#define TDLS_TESTING_WRONG_MIC BIT(11) 37unsigned int tdls_testing = 0; 38#endif /* CONFIG_TDLS_TESTING */ 39 40#define TPK_LIFETIME 43200 /* 12 hours */ 41#define TPK_M1_RETRY_COUNT 3 42#define TPK_M1_TIMEOUT 5000 /* in milliseconds */ 43#define TPK_M2_RETRY_COUNT 10 44#define TPK_M2_TIMEOUT 500 /* in milliseconds */ 45 46#define TDLS_MIC_LEN 16 47 48#define TDLS_TIMEOUT_LEN 4 49 50struct wpa_tdls_ftie { 51 u8 ie_type; /* FTIE */ 52 u8 ie_len; 53 u8 mic_ctrl[2]; 54 u8 mic[TDLS_MIC_LEN]; 55 u8 Anonce[WPA_NONCE_LEN]; /* Responder Nonce in TDLS */ 56 u8 Snonce[WPA_NONCE_LEN]; /* Initiator Nonce in TDLS */ 57 /* followed by optional elements */ 58} STRUCT_PACKED; 59 60struct wpa_tdls_timeoutie { 61 u8 ie_type; /* Timeout IE */ 62 u8 ie_len; 63 u8 interval_type; 64 u8 value[TDLS_TIMEOUT_LEN]; 65} STRUCT_PACKED; 66 67struct wpa_tdls_lnkid { 68 u8 ie_type; /* Link Identifier IE */ 69 u8 ie_len; 70 u8 bssid[ETH_ALEN]; 71 u8 init_sta[ETH_ALEN]; 72 u8 resp_sta[ETH_ALEN]; 73} STRUCT_PACKED; 74 75/* TDLS frame headers as per IEEE Std 802.11z-2010 */ 76struct wpa_tdls_frame { 77 u8 payloadtype; /* IEEE80211_TDLS_RFTYPE */ 78 u8 category; /* Category */ 79 u8 action; /* Action (enum tdls_frame_type) */ 80} STRUCT_PACKED; 81 82static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs); 83static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx); 84static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer); 85static void wpa_tdls_disable_peer_link(struct wpa_sm *sm, 86 struct wpa_tdls_peer *peer); 87static int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr, 88 u16 reason_code); 89 90 91#define TDLS_MAX_IE_LEN 80 92#define IEEE80211_MAX_SUPP_RATES 32 93 94struct wpa_tdls_peer { 95 struct wpa_tdls_peer *next; 96 unsigned int reconfig_key:1; 97 int initiator; /* whether this end was initiator for TDLS setup */ 98 u8 addr[ETH_ALEN]; /* other end MAC address */ 99 u8 inonce[WPA_NONCE_LEN]; /* Initiator Nonce */ 100 u8 rnonce[WPA_NONCE_LEN]; /* Responder Nonce */ 101 u8 rsnie_i[TDLS_MAX_IE_LEN]; /* Initiator RSN IE */ 102 size_t rsnie_i_len; 103 u8 rsnie_p[TDLS_MAX_IE_LEN]; /* Peer RSN IE */ 104 size_t rsnie_p_len; 105 u32 lifetime; 106 int cipher; /* Selected cipher (WPA_CIPHER_*) */ 107 u8 dtoken; 108 109 struct tpk { 110 u8 kck[16]; /* TPK-KCK */ 111 u8 tk[16]; /* TPK-TK; assuming only CCMP will be used */ 112 } tpk; 113 int tpk_set; 114 int tpk_success; 115 int tpk_in_progress; 116 117 struct tpk_timer { 118 u8 dest[ETH_ALEN]; 119 int count; /* Retry Count */ 120 int timer; /* Timeout in milliseconds */ 121 u8 action_code; /* TDLS frame type */ 122 u8 dialog_token; 123 u16 status_code; 124 u32 peer_capab; 125 int buf_len; /* length of TPK message for retransmission */ 126 u8 *buf; /* buffer for TPK message */ 127 } sm_tmr; 128 129 u16 capability; 130 131 u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; 132 size_t supp_rates_len; 133 134 struct ieee80211_ht_capabilities *ht_capabilities; 135 struct ieee80211_vht_capabilities *vht_capabilities; 136 137 u8 qos_info; 138 139 u16 aid; 140 141 u8 *ext_capab; 142 size_t ext_capab_len; 143 144 u8 *supp_channels; 145 size_t supp_channels_len; 146 147 u8 *supp_oper_classes; 148 size_t supp_oper_classes_len; 149 150 u8 wmm_capable; 151 152 /* channel switch currently enabled */ 153 int chan_switch_enabled; 154}; 155 156 157static int wpa_tdls_get_privacy(struct wpa_sm *sm) 158{ 159 /* 160 * Get info needed from supplicant to check if the current BSS supports 161 * security. Other than OPEN mode, rest are considered secured 162 * WEP/WPA/WPA2 hence TDLS frames are processed for TPK handshake. 163 */ 164 return sm->pairwise_cipher != WPA_CIPHER_NONE; 165} 166 167 168static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len) 169{ 170 os_memcpy(pos, ie, ie_len); 171 return pos + ie_len; 172} 173 174 175static int wpa_tdls_del_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 176{ 177 if (wpa_sm_set_key(sm, WPA_ALG_NONE, peer->addr, 178 0, 0, NULL, 0, NULL, 0) < 0) { 179 wpa_printf(MSG_WARNING, "TDLS: Failed to delete TPK-TK from " 180 "the driver"); 181 return -1; 182 } 183 184 return 0; 185} 186 187 188static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 189{ 190 u8 key_len; 191 u8 rsc[6]; 192 enum wpa_alg alg; 193 194 os_memset(rsc, 0, 6); 195 196 switch (peer->cipher) { 197 case WPA_CIPHER_CCMP: 198 alg = WPA_ALG_CCMP; 199 key_len = 16; 200 break; 201 case WPA_CIPHER_NONE: 202 wpa_printf(MSG_DEBUG, "TDLS: Pairwise Cipher Suite: " 203 "NONE - do not use pairwise keys"); 204 return -1; 205 default: 206 wpa_printf(MSG_WARNING, "TDLS: Unsupported pairwise cipher %d", 207 sm->pairwise_cipher); 208 return -1; 209 } 210 211 if (wpa_sm_set_key(sm, alg, peer->addr, -1, 1, 212 rsc, sizeof(rsc), peer->tpk.tk, key_len) < 0) { 213 wpa_printf(MSG_WARNING, "TDLS: Failed to set TPK to the " 214 "driver"); 215 return -1; 216 } 217 return 0; 218} 219 220 221static int wpa_tdls_send_tpk_msg(struct wpa_sm *sm, const u8 *dst, 222 u8 action_code, u8 dialog_token, 223 u16 status_code, u32 peer_capab, 224 int initiator, const u8 *buf, size_t len) 225{ 226 return wpa_sm_send_tdls_mgmt(sm, dst, action_code, dialog_token, 227 status_code, peer_capab, initiator, buf, 228 len); 229} 230 231 232static int wpa_tdls_tpk_send(struct wpa_sm *sm, const u8 *dest, u8 action_code, 233 u8 dialog_token, u16 status_code, u32 peer_capab, 234 int initiator, const u8 *msg, size_t msg_len) 235{ 236 struct wpa_tdls_peer *peer; 237 238 wpa_printf(MSG_DEBUG, "TDLS: TPK send dest=" MACSTR " action_code=%u " 239 "dialog_token=%u status_code=%u peer_capab=%u initiator=%d " 240 "msg_len=%u", 241 MAC2STR(dest), action_code, dialog_token, status_code, 242 peer_capab, initiator, (unsigned int) msg_len); 243 244 if (wpa_tdls_send_tpk_msg(sm, dest, action_code, dialog_token, 245 status_code, peer_capab, initiator, msg, 246 msg_len)) { 247 wpa_printf(MSG_INFO, "TDLS: Failed to send message " 248 "(action_code=%u)", action_code); 249 return -1; 250 } 251 252 if (action_code == WLAN_TDLS_SETUP_CONFIRM || 253 action_code == WLAN_TDLS_TEARDOWN || 254 action_code == WLAN_TDLS_DISCOVERY_REQUEST || 255 action_code == WLAN_TDLS_DISCOVERY_RESPONSE) 256 return 0; /* No retries */ 257 258 for (peer = sm->tdls; peer; peer = peer->next) { 259 if (os_memcmp(peer->addr, dest, ETH_ALEN) == 0) 260 break; 261 } 262 263 if (peer == NULL) { 264 wpa_printf(MSG_INFO, "TDLS: No matching entry found for " 265 "retry " MACSTR, MAC2STR(dest)); 266 return 0; 267 } 268 269 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 270 271 if (action_code == WLAN_TDLS_SETUP_RESPONSE) { 272 peer->sm_tmr.count = TPK_M2_RETRY_COUNT; 273 peer->sm_tmr.timer = TPK_M2_TIMEOUT; 274 } else { 275 peer->sm_tmr.count = TPK_M1_RETRY_COUNT; 276 peer->sm_tmr.timer = TPK_M1_TIMEOUT; 277 } 278 279 /* Copy message to resend on timeout */ 280 os_memcpy(peer->sm_tmr.dest, dest, ETH_ALEN); 281 peer->sm_tmr.action_code = action_code; 282 peer->sm_tmr.dialog_token = dialog_token; 283 peer->sm_tmr.status_code = status_code; 284 peer->sm_tmr.peer_capab = peer_capab; 285 peer->sm_tmr.buf_len = msg_len; 286 os_free(peer->sm_tmr.buf); 287 peer->sm_tmr.buf = os_malloc(msg_len); 288 if (peer->sm_tmr.buf == NULL) 289 return -1; 290 os_memcpy(peer->sm_tmr.buf, msg, msg_len); 291 292 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout registered " 293 "(action_code=%u)", action_code); 294 eloop_register_timeout(peer->sm_tmr.timer / 1000, 295 (peer->sm_tmr.timer % 1000) * 1000, 296 wpa_tdls_tpk_retry_timeout, sm, peer); 297 return 0; 298} 299 300 301static int wpa_tdls_do_teardown(struct wpa_sm *sm, struct wpa_tdls_peer *peer, 302 u16 reason_code) 303{ 304 int ret; 305 306 ret = wpa_tdls_send_teardown(sm, peer->addr, reason_code); 307 /* disable the link after teardown was sent */ 308 wpa_tdls_disable_peer_link(sm, peer); 309 310 return ret; 311} 312 313 314static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx) 315{ 316 317 struct wpa_sm *sm = eloop_ctx; 318 struct wpa_tdls_peer *peer = timeout_ctx; 319 320 if (peer->sm_tmr.count) { 321 peer->sm_tmr.count--; 322 323 wpa_printf(MSG_INFO, "TDLS: Retrying sending of message " 324 "(action_code=%u)", 325 peer->sm_tmr.action_code); 326 327 if (peer->sm_tmr.buf == NULL) { 328 wpa_printf(MSG_INFO, "TDLS: No retry buffer available " 329 "for action_code=%u", 330 peer->sm_tmr.action_code); 331 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, 332 peer); 333 return; 334 } 335 336 /* resend TPK Handshake Message to Peer */ 337 if (wpa_tdls_send_tpk_msg(sm, peer->sm_tmr.dest, 338 peer->sm_tmr.action_code, 339 peer->sm_tmr.dialog_token, 340 peer->sm_tmr.status_code, 341 peer->sm_tmr.peer_capab, 342 peer->initiator, 343 peer->sm_tmr.buf, 344 peer->sm_tmr.buf_len)) { 345 wpa_printf(MSG_INFO, "TDLS: Failed to retry " 346 "transmission"); 347 } 348 349 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 350 eloop_register_timeout(peer->sm_tmr.timer / 1000, 351 (peer->sm_tmr.timer % 1000) * 1000, 352 wpa_tdls_tpk_retry_timeout, sm, peer); 353 } else { 354 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 355 356 wpa_printf(MSG_DEBUG, "TDLS: Sending Teardown Request"); 357 wpa_tdls_do_teardown(sm, peer, 358 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED); 359 } 360} 361 362 363static void wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm *sm, 364 struct wpa_tdls_peer *peer, 365 u8 action_code) 366{ 367 if (action_code == peer->sm_tmr.action_code) { 368 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout cancelled for " 369 "action_code=%u", action_code); 370 371 /* Cancel Timeout registered */ 372 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 373 374 /* free all resources meant for retry */ 375 os_free(peer->sm_tmr.buf); 376 peer->sm_tmr.buf = NULL; 377 378 peer->sm_tmr.count = 0; 379 peer->sm_tmr.timer = 0; 380 peer->sm_tmr.buf_len = 0; 381 peer->sm_tmr.action_code = 0xff; 382 } else { 383 wpa_printf(MSG_INFO, "TDLS: Error in cancelling retry timeout " 384 "(Unknown action_code=%u)", action_code); 385 } 386} 387 388 389static void wpa_tdls_generate_tpk(struct wpa_tdls_peer *peer, 390 const u8 *own_addr, const u8 *bssid) 391{ 392 u8 key_input[SHA256_MAC_LEN]; 393 const u8 *nonce[2]; 394 size_t len[2]; 395 u8 data[3 * ETH_ALEN]; 396 397 /* IEEE Std 802.11z-2010 8.5.9.1: 398 * TPK-Key-Input = SHA-256(min(SNonce, ANonce) || max(SNonce, ANonce)) 399 */ 400 len[0] = WPA_NONCE_LEN; 401 len[1] = WPA_NONCE_LEN; 402 if (os_memcmp(peer->inonce, peer->rnonce, WPA_NONCE_LEN) < 0) { 403 nonce[0] = peer->inonce; 404 nonce[1] = peer->rnonce; 405 } else { 406 nonce[0] = peer->rnonce; 407 nonce[1] = peer->inonce; 408 } 409 wpa_hexdump(MSG_DEBUG, "TDLS: min(Nonce)", nonce[0], WPA_NONCE_LEN); 410 wpa_hexdump(MSG_DEBUG, "TDLS: max(Nonce)", nonce[1], WPA_NONCE_LEN); 411 sha256_vector(2, nonce, len, key_input); 412 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-Key-Input", 413 key_input, SHA256_MAC_LEN); 414 415 /* 416 * TPK-Key-Data = KDF-N_KEY(TPK-Key-Input, "TDLS PMK", 417 * min(MAC_I, MAC_R) || max(MAC_I, MAC_R) || BSSID || N_KEY) 418 * TODO: is N_KEY really included in KDF Context and if so, in which 419 * presentation format (little endian 16-bit?) is it used? It gets 420 * added by the KDF anyway.. 421 */ 422 423 if (os_memcmp(own_addr, peer->addr, ETH_ALEN) < 0) { 424 os_memcpy(data, own_addr, ETH_ALEN); 425 os_memcpy(data + ETH_ALEN, peer->addr, ETH_ALEN); 426 } else { 427 os_memcpy(data, peer->addr, ETH_ALEN); 428 os_memcpy(data + ETH_ALEN, own_addr, ETH_ALEN); 429 } 430 os_memcpy(data + 2 * ETH_ALEN, bssid, ETH_ALEN); 431 wpa_hexdump(MSG_DEBUG, "TDLS: KDF Context", data, sizeof(data)); 432 433 sha256_prf(key_input, SHA256_MAC_LEN, "TDLS PMK", data, sizeof(data), 434 (u8 *) &peer->tpk, sizeof(peer->tpk)); 435 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-KCK", 436 peer->tpk.kck, sizeof(peer->tpk.kck)); 437 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-TK", 438 peer->tpk.tk, sizeof(peer->tpk.tk)); 439 peer->tpk_set = 1; 440} 441 442 443/** 444 * wpa_tdls_ftie_mic - Calculate TDLS FTIE MIC 445 * @kck: TPK-KCK 446 * @lnkid: Pointer to the beginning of Link Identifier IE 447 * @rsnie: Pointer to the beginning of RSN IE used for handshake 448 * @timeoutie: Pointer to the beginning of Timeout IE used for handshake 449 * @ftie: Pointer to the beginning of FT IE 450 * @mic: Pointer for writing MIC 451 * 452 * Calculate MIC for TDLS frame. 453 */ 454static int wpa_tdls_ftie_mic(const u8 *kck, u8 trans_seq, const u8 *lnkid, 455 const u8 *rsnie, const u8 *timeoutie, 456 const u8 *ftie, u8 *mic) 457{ 458 u8 *buf, *pos; 459 struct wpa_tdls_ftie *_ftie; 460 const struct wpa_tdls_lnkid *_lnkid; 461 int ret; 462 int len = 2 * ETH_ALEN + 1 + 2 + lnkid[1] + 2 + rsnie[1] + 463 2 + timeoutie[1] + 2 + ftie[1]; 464 buf = os_zalloc(len); 465 if (!buf) { 466 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation"); 467 return -1; 468 } 469 470 pos = buf; 471 _lnkid = (const struct wpa_tdls_lnkid *) lnkid; 472 /* 1) TDLS initiator STA MAC address */ 473 os_memcpy(pos, _lnkid->init_sta, ETH_ALEN); 474 pos += ETH_ALEN; 475 /* 2) TDLS responder STA MAC address */ 476 os_memcpy(pos, _lnkid->resp_sta, ETH_ALEN); 477 pos += ETH_ALEN; 478 /* 3) Transaction Sequence number */ 479 *pos++ = trans_seq; 480 /* 4) Link Identifier IE */ 481 os_memcpy(pos, lnkid, 2 + lnkid[1]); 482 pos += 2 + lnkid[1]; 483 /* 5) RSN IE */ 484 os_memcpy(pos, rsnie, 2 + rsnie[1]); 485 pos += 2 + rsnie[1]; 486 /* 6) Timeout Interval IE */ 487 os_memcpy(pos, timeoutie, 2 + timeoutie[1]); 488 pos += 2 + timeoutie[1]; 489 /* 7) FTIE, with the MIC field of the FTIE set to 0 */ 490 os_memcpy(pos, ftie, 2 + ftie[1]); 491 _ftie = (struct wpa_tdls_ftie *) pos; 492 os_memset(_ftie->mic, 0, TDLS_MIC_LEN); 493 pos += 2 + ftie[1]; 494 495 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf); 496 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16); 497 ret = omac1_aes_128(kck, buf, pos - buf, mic); 498 os_free(buf); 499 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16); 500 return ret; 501} 502 503 504/** 505 * wpa_tdls_key_mic_teardown - Calculate TDLS FTIE MIC for Teardown frame 506 * @kck: TPK-KCK 507 * @trans_seq: Transaction Sequence Number (4 - Teardown) 508 * @rcode: Reason code for Teardown 509 * @dtoken: Dialog Token used for that particular link 510 * @lnkid: Pointer to the beginning of Link Identifier IE 511 * @ftie: Pointer to the beginning of FT IE 512 * @mic: Pointer for writing MIC 513 * 514 * Calculate MIC for TDLS frame. 515 */ 516static int wpa_tdls_key_mic_teardown(const u8 *kck, u8 trans_seq, u16 rcode, 517 u8 dtoken, const u8 *lnkid, 518 const u8 *ftie, u8 *mic) 519{ 520 u8 *buf, *pos; 521 struct wpa_tdls_ftie *_ftie; 522 int ret; 523 int len; 524 525 if (lnkid == NULL) 526 return -1; 527 528 len = 2 + lnkid[1] + sizeof(rcode) + sizeof(dtoken) + 529 sizeof(trans_seq) + 2 + ftie[1]; 530 531 buf = os_zalloc(len); 532 if (!buf) { 533 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation"); 534 return -1; 535 } 536 537 pos = buf; 538 /* 1) Link Identifier IE */ 539 os_memcpy(pos, lnkid, 2 + lnkid[1]); 540 pos += 2 + lnkid[1]; 541 /* 2) Reason Code */ 542 WPA_PUT_LE16(pos, rcode); 543 pos += sizeof(rcode); 544 /* 3) Dialog token */ 545 *pos++ = dtoken; 546 /* 4) Transaction Sequence number */ 547 *pos++ = trans_seq; 548 /* 7) FTIE, with the MIC field of the FTIE set to 0 */ 549 os_memcpy(pos, ftie, 2 + ftie[1]); 550 _ftie = (struct wpa_tdls_ftie *) pos; 551 os_memset(_ftie->mic, 0, TDLS_MIC_LEN); 552 pos += 2 + ftie[1]; 553 554 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf); 555 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16); 556 ret = omac1_aes_128(kck, buf, pos - buf, mic); 557 os_free(buf); 558 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16); 559 return ret; 560} 561 562 563static int wpa_supplicant_verify_tdls_mic(u8 trans_seq, 564 struct wpa_tdls_peer *peer, 565 const u8 *lnkid, const u8 *timeoutie, 566 const struct wpa_tdls_ftie *ftie) 567{ 568 u8 mic[16]; 569 570 if (peer->tpk_set) { 571 wpa_tdls_ftie_mic(peer->tpk.kck, trans_seq, lnkid, 572 peer->rsnie_p, timeoutie, (u8 *) ftie, 573 mic); 574 if (os_memcmp_const(mic, ftie->mic, 16) != 0) { 575 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in FTIE - " 576 "dropping packet"); 577 wpa_hexdump(MSG_DEBUG, "TDLS: Received MIC", 578 ftie->mic, 16); 579 wpa_hexdump(MSG_DEBUG, "TDLS: Calculated MIC", 580 mic, 16); 581 return -1; 582 } 583 } else { 584 wpa_printf(MSG_WARNING, "TDLS: Could not verify TDLS MIC, " 585 "TPK not set - dropping packet"); 586 return -1; 587 } 588 return 0; 589} 590 591 592static int wpa_supplicant_verify_tdls_mic_teardown( 593 u8 trans_seq, u16 rcode, u8 dtoken, struct wpa_tdls_peer *peer, 594 const u8 *lnkid, const struct wpa_tdls_ftie *ftie) 595{ 596 u8 mic[16]; 597 598 if (peer->tpk_set) { 599 wpa_tdls_key_mic_teardown(peer->tpk.kck, trans_seq, rcode, 600 dtoken, lnkid, (u8 *) ftie, mic); 601 if (os_memcmp_const(mic, ftie->mic, 16) != 0) { 602 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in Teardown - " 603 "dropping packet"); 604 return -1; 605 } 606 } else { 607 wpa_printf(MSG_INFO, "TDLS: Could not verify TDLS Teardown " 608 "MIC, TPK not set - dropping packet"); 609 return -1; 610 } 611 return 0; 612} 613 614 615static void wpa_tdls_tpk_timeout(void *eloop_ctx, void *timeout_ctx) 616{ 617 struct wpa_sm *sm = eloop_ctx; 618 struct wpa_tdls_peer *peer = timeout_ctx; 619 620 /* 621 * On TPK lifetime expiration, we have an option of either tearing down 622 * the direct link or trying to re-initiate it. The selection of what 623 * to do is not strictly speaking controlled by our role in the expired 624 * link, but for now, use that to select whether to renew or tear down 625 * the link. 626 */ 627 628 if (peer->initiator) { 629 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR 630 " - try to renew", MAC2STR(peer->addr)); 631 wpa_tdls_start(sm, peer->addr); 632 } else { 633 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR 634 " - tear down", MAC2STR(peer->addr)); 635 wpa_tdls_do_teardown(sm, peer, 636 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED); 637 } 638} 639 640 641static void wpa_tdls_peer_remove_from_list(struct wpa_sm *sm, 642 struct wpa_tdls_peer *peer) 643{ 644 struct wpa_tdls_peer *cur, *prev; 645 646 cur = sm->tdls; 647 prev = NULL; 648 while (cur && cur != peer) { 649 prev = cur; 650 cur = cur->next; 651 } 652 653 if (cur != peer) { 654 wpa_printf(MSG_ERROR, "TDLS: Could not find peer " MACSTR 655 " to remove it from the list", 656 MAC2STR(peer->addr)); 657 return; 658 } 659 660 if (prev) 661 prev->next = peer->next; 662 else 663 sm->tdls = peer->next; 664} 665 666 667static void wpa_tdls_peer_clear(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 668{ 669 wpa_printf(MSG_DEBUG, "TDLS: Clear state for peer " MACSTR, 670 MAC2STR(peer->addr)); 671 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer); 672 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); 673 peer->reconfig_key = 0; 674 peer->initiator = 0; 675 peer->tpk_in_progress = 0; 676 os_free(peer->sm_tmr.buf); 677 peer->sm_tmr.buf = NULL; 678 os_free(peer->ht_capabilities); 679 peer->ht_capabilities = NULL; 680 os_free(peer->vht_capabilities); 681 peer->vht_capabilities = NULL; 682 os_free(peer->ext_capab); 683 peer->ext_capab = NULL; 684 os_free(peer->supp_channels); 685 peer->supp_channels = NULL; 686 os_free(peer->supp_oper_classes); 687 peer->supp_oper_classes = NULL; 688 peer->rsnie_i_len = peer->rsnie_p_len = 0; 689 peer->cipher = 0; 690 peer->qos_info = 0; 691 peer->wmm_capable = 0; 692 peer->tpk_set = peer->tpk_success = 0; 693 peer->chan_switch_enabled = 0; 694 os_memset(&peer->tpk, 0, sizeof(peer->tpk)); 695 os_memset(peer->inonce, 0, WPA_NONCE_LEN); 696 os_memset(peer->rnonce, 0, WPA_NONCE_LEN); 697} 698 699 700static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 701{ 702 wpa_tdls_peer_clear(sm, peer); 703 wpa_tdls_peer_remove_from_list(sm, peer); 704 os_free(peer); 705} 706 707 708static void wpa_tdls_linkid(struct wpa_sm *sm, struct wpa_tdls_peer *peer, 709 struct wpa_tdls_lnkid *lnkid) 710{ 711 lnkid->ie_type = WLAN_EID_LINK_ID; 712 lnkid->ie_len = 3 * ETH_ALEN; 713 os_memcpy(lnkid->bssid, sm->bssid, ETH_ALEN); 714 if (peer->initiator) { 715 os_memcpy(lnkid->init_sta, sm->own_addr, ETH_ALEN); 716 os_memcpy(lnkid->resp_sta, peer->addr, ETH_ALEN); 717 } else { 718 os_memcpy(lnkid->init_sta, peer->addr, ETH_ALEN); 719 os_memcpy(lnkid->resp_sta, sm->own_addr, ETH_ALEN); 720 } 721} 722 723 724static int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr, 725 u16 reason_code) 726{ 727 struct wpa_tdls_peer *peer; 728 struct wpa_tdls_ftie *ftie; 729 struct wpa_tdls_lnkid lnkid; 730 u8 dialog_token; 731 u8 *rbuf, *pos; 732 int ielen; 733 734 if (sm->tdls_disabled || !sm->tdls_supported) 735 return -1; 736 737 /* Find the node and free from the list */ 738 for (peer = sm->tdls; peer; peer = peer->next) { 739 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 740 break; 741 } 742 743 if (peer == NULL) { 744 wpa_printf(MSG_INFO, "TDLS: No matching entry found for " 745 "Teardown " MACSTR, MAC2STR(addr)); 746 return 0; 747 } 748 749 /* Cancel active channel switch before teardown */ 750 if (peer->chan_switch_enabled) { 751 wpa_printf(MSG_DEBUG, "TDLS: First returning link with " MACSTR 752 " to base channel", MAC2STR(addr)); 753 wpa_sm_tdls_disable_channel_switch(sm, peer->addr); 754 } 755 756 dialog_token = peer->dtoken; 757 758 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown for " MACSTR, 759 MAC2STR(addr)); 760 761 ielen = 0; 762 if (wpa_tdls_get_privacy(sm) && peer->tpk_set && peer->tpk_success) { 763 /* To add FTIE for Teardown request and compute MIC */ 764 ielen += sizeof(*ftie); 765#ifdef CONFIG_TDLS_TESTING 766 if (tdls_testing & TDLS_TESTING_LONG_FRAME) 767 ielen += 170; 768#endif /* CONFIG_TDLS_TESTING */ 769 } 770 771 rbuf = os_zalloc(ielen + 1); 772 if (rbuf == NULL) 773 return -1; 774 pos = rbuf; 775 776 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success) 777 goto skip_ies; 778 779 ftie = (struct wpa_tdls_ftie *) pos; 780 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; 781 /* Using the recent nonce which should be for CONFIRM frame */ 782 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN); 783 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); 784 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; 785 pos = (u8 *) (ftie + 1); 786#ifdef CONFIG_TDLS_TESTING 787 if (tdls_testing & TDLS_TESTING_LONG_FRAME) { 788 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " 789 "FTIE"); 790 ftie->ie_len += 170; 791 *pos++ = 255; /* FTIE subelem */ 792 *pos++ = 168; /* FTIE subelem length */ 793 pos += 168; 794 } 795#endif /* CONFIG_TDLS_TESTING */ 796 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TDLS Teardown handshake", 797 (u8 *) ftie, pos - (u8 *) ftie); 798 799 /* compute MIC before sending */ 800 wpa_tdls_linkid(sm, peer, &lnkid); 801 wpa_tdls_key_mic_teardown(peer->tpk.kck, 4, reason_code, 802 dialog_token, (u8 *) &lnkid, (u8 *) ftie, 803 ftie->mic); 804 805skip_ies: 806 /* TODO: register for a Timeout handler, if Teardown is not received at 807 * the other end, then try again another time */ 808 809 /* request driver to send Teardown using this FTIE */ 810 wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_TEARDOWN, 0, 811 reason_code, 0, peer->initiator, rbuf, pos - rbuf); 812 os_free(rbuf); 813 814 return 0; 815} 816 817 818int wpa_tdls_teardown_link(struct wpa_sm *sm, const u8 *addr, u16 reason_code) 819{ 820 struct wpa_tdls_peer *peer; 821 822 if (sm->tdls_disabled || !sm->tdls_supported) 823 return -1; 824 825 for (peer = sm->tdls; peer; peer = peer->next) { 826 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 827 break; 828 } 829 830 if (peer == NULL) { 831 wpa_printf(MSG_DEBUG, "TDLS: Could not find peer " MACSTR 832 " for link Teardown", MAC2STR(addr)); 833 return -1; 834 } 835 836 if (!peer->tpk_success) { 837 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR 838 " not connected - cannot Teardown link", MAC2STR(addr)); 839 return -1; 840 } 841 842 return wpa_tdls_do_teardown(sm, peer, reason_code); 843} 844 845 846static void wpa_tdls_disable_peer_link(struct wpa_sm *sm, 847 struct wpa_tdls_peer *peer) 848{ 849 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); 850 wpa_tdls_peer_free(sm, peer); 851} 852 853 854void wpa_tdls_disable_unreachable_link(struct wpa_sm *sm, const u8 *addr) 855{ 856 struct wpa_tdls_peer *peer; 857 858 for (peer = sm->tdls; peer; peer = peer->next) { 859 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 860 break; 861 } 862 863 if (!peer || !peer->tpk_success) { 864 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR 865 " not connected - cannot teardown unreachable link", 866 MAC2STR(addr)); 867 return; 868 } 869 870 if (wpa_tdls_is_external_setup(sm)) { 871 /* 872 * Get us on the base channel, disable the link, send a 873 * teardown packet through the AP, and then reset link data. 874 */ 875 if (peer->chan_switch_enabled) 876 wpa_sm_tdls_disable_channel_switch(sm, peer->addr); 877 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, addr); 878 wpa_tdls_send_teardown(sm, addr, 879 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE); 880 wpa_tdls_peer_free(sm, peer); 881 } else { 882 wpa_tdls_disable_peer_link(sm, peer); 883 } 884} 885 886 887const char * wpa_tdls_get_link_status(struct wpa_sm *sm, const u8 *addr) 888{ 889 struct wpa_tdls_peer *peer; 890 891 if (sm->tdls_disabled || !sm->tdls_supported) 892 return "disabled"; 893 894 for (peer = sm->tdls; peer; peer = peer->next) { 895 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 896 break; 897 } 898 899 if (peer == NULL) 900 return "peer does not exist"; 901 902 if (!peer->tpk_success) 903 return "peer not connected"; 904 905 return "connected"; 906} 907 908 909static int wpa_tdls_recv_teardown(struct wpa_sm *sm, const u8 *src_addr, 910 const u8 *buf, size_t len) 911{ 912 struct wpa_tdls_peer *peer = NULL; 913 struct wpa_tdls_ftie *ftie; 914 struct wpa_tdls_lnkid *lnkid; 915 struct wpa_eapol_ie_parse kde; 916 u16 reason_code; 917 const u8 *pos; 918 int ielen; 919 920 /* Find the node and free from the list */ 921 for (peer = sm->tdls; peer; peer = peer->next) { 922 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) 923 break; 924 } 925 926 if (peer == NULL) { 927 wpa_printf(MSG_INFO, "TDLS: No matching entry found for " 928 "Teardown " MACSTR, MAC2STR(src_addr)); 929 return 0; 930 } 931 932 pos = buf; 933 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; 934 935 reason_code = WPA_GET_LE16(pos); 936 pos += 2; 937 938 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown Request from " MACSTR 939 " (reason code %u)", MAC2STR(src_addr), reason_code); 940 941 ielen = len - (pos - buf); /* start of IE in buf */ 942 943 /* 944 * Don't reject the message if failing to parse IEs. The IEs we need are 945 * explicitly checked below. Some APs may add arbitrary padding to the 946 * end of short TDLS frames and that would look like invalid IEs. 947 */ 948 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) 949 wpa_printf(MSG_DEBUG, 950 "TDLS: Failed to parse IEs in Teardown - ignore as an interop workaround"); 951 952 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { 953 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TDLS " 954 "Teardown"); 955 return -1; 956 } 957 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; 958 959 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success) 960 goto skip_ftie; 961 962 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) { 963 wpa_printf(MSG_INFO, "TDLS: No FTIE in TDLS Teardown"); 964 return -1; 965 } 966 967 ftie = (struct wpa_tdls_ftie *) kde.ftie; 968 969 /* Process MIC check to see if TDLS Teardown is right */ 970 if (wpa_supplicant_verify_tdls_mic_teardown(4, reason_code, 971 peer->dtoken, peer, 972 (u8 *) lnkid, ftie) < 0) { 973 wpa_printf(MSG_DEBUG, "TDLS: MIC failure for TDLS " 974 "Teardown Request from " MACSTR, MAC2STR(src_addr)); 975 return -1; 976 } 977 978skip_ftie: 979 /* 980 * Request the driver to disable the direct link and clear associated 981 * keys. 982 */ 983 wpa_tdls_disable_peer_link(sm, peer); 984 return 0; 985} 986 987 988/** 989 * wpa_tdls_send_error - To send suitable TDLS status response with 990 * appropriate status code mentioning reason for error/failure. 991 * @dst - MAC addr of Peer station 992 * @tdls_action - TDLS frame type for which error code is sent 993 * @initiator - was this end the initiator of the connection 994 * @status - status code mentioning reason 995 */ 996 997static int wpa_tdls_send_error(struct wpa_sm *sm, const u8 *dst, 998 u8 tdls_action, u8 dialog_token, int initiator, 999 u16 status) 1000{ 1001 wpa_printf(MSG_DEBUG, "TDLS: Sending error to " MACSTR 1002 " (action=%u status=%u)", 1003 MAC2STR(dst), tdls_action, status); 1004 return wpa_tdls_tpk_send(sm, dst, tdls_action, dialog_token, status, 1005 0, initiator, NULL, 0); 1006} 1007 1008 1009static struct wpa_tdls_peer * 1010wpa_tdls_add_peer(struct wpa_sm *sm, const u8 *addr, int *existing) 1011{ 1012 struct wpa_tdls_peer *peer; 1013 1014 if (existing) 1015 *existing = 0; 1016 for (peer = sm->tdls; peer; peer = peer->next) { 1017 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) { 1018 if (existing) 1019 *existing = 1; 1020 return peer; /* re-use existing entry */ 1021 } 1022 } 1023 1024 wpa_printf(MSG_INFO, "TDLS: Creating peer entry for " MACSTR, 1025 MAC2STR(addr)); 1026 1027 peer = os_zalloc(sizeof(*peer)); 1028 if (peer == NULL) 1029 return NULL; 1030 1031 os_memcpy(peer->addr, addr, ETH_ALEN); 1032 peer->next = sm->tdls; 1033 sm->tdls = peer; 1034 1035 return peer; 1036} 1037 1038 1039static int wpa_tdls_send_tpk_m1(struct wpa_sm *sm, 1040 struct wpa_tdls_peer *peer) 1041{ 1042 size_t buf_len; 1043 struct wpa_tdls_timeoutie timeoutie; 1044 u16 rsn_capab; 1045 struct wpa_tdls_ftie *ftie; 1046 u8 *rbuf, *pos, *count_pos; 1047 u16 count; 1048 struct rsn_ie_hdr *hdr; 1049 int status; 1050 1051 if (!wpa_tdls_get_privacy(sm)) { 1052 wpa_printf(MSG_DEBUG, "TDLS: No security used on the link"); 1053 peer->rsnie_i_len = 0; 1054 goto skip_rsnie; 1055 } 1056 1057 /* 1058 * TPK Handshake Message 1: 1059 * FTIE: ANonce=0, SNonce=initiator nonce MIC=0, DataKDs=(RSNIE_I, 1060 * Timeout Interval IE)) 1061 */ 1062 1063 /* Filling RSN IE */ 1064 hdr = (struct rsn_ie_hdr *) peer->rsnie_i; 1065 hdr->elem_id = WLAN_EID_RSN; 1066 WPA_PUT_LE16(hdr->version, RSN_VERSION); 1067 1068 pos = (u8 *) (hdr + 1); 1069 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED); 1070 pos += RSN_SELECTOR_LEN; 1071 count_pos = pos; 1072 pos += 2; 1073 1074 count = 0; 1075 1076 /* 1077 * AES-CCMP is the default Encryption preferred for TDLS, so 1078 * RSN IE is filled only with CCMP CIPHER 1079 * Note: TKIP is not used to encrypt TDLS link. 1080 * 1081 * Regardless of the cipher used on the AP connection, select CCMP 1082 * here. 1083 */ 1084 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 1085 pos += RSN_SELECTOR_LEN; 1086 count++; 1087 1088 WPA_PUT_LE16(count_pos, count); 1089 1090 WPA_PUT_LE16(pos, 1); 1091 pos += 2; 1092 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE); 1093 pos += RSN_SELECTOR_LEN; 1094 1095 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; 1096 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2; 1097#ifdef CONFIG_TDLS_TESTING 1098 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) { 1099 wpa_printf(MSG_DEBUG, "TDLS: Use alternative RSN IE for " 1100 "testing"); 1101 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; 1102 } 1103#endif /* CONFIG_TDLS_TESTING */ 1104 WPA_PUT_LE16(pos, rsn_capab); 1105 pos += 2; 1106#ifdef CONFIG_TDLS_TESTING 1107 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) { 1108 /* Number of PMKIDs */ 1109 *pos++ = 0x00; 1110 *pos++ = 0x00; 1111 } 1112#endif /* CONFIG_TDLS_TESTING */ 1113 1114 hdr->len = (pos - peer->rsnie_i) - 2; 1115 peer->rsnie_i_len = pos - peer->rsnie_i; 1116 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake", 1117 peer->rsnie_i, peer->rsnie_i_len); 1118 1119skip_rsnie: 1120 buf_len = 0; 1121 if (wpa_tdls_get_privacy(sm)) 1122 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) + 1123 sizeof(struct wpa_tdls_timeoutie); 1124#ifdef CONFIG_TDLS_TESTING 1125 if (wpa_tdls_get_privacy(sm) && 1126 (tdls_testing & TDLS_TESTING_LONG_FRAME)) 1127 buf_len += 170; 1128 if (tdls_testing & TDLS_TESTING_DIFF_BSSID) 1129 buf_len += sizeof(struct wpa_tdls_lnkid); 1130#endif /* CONFIG_TDLS_TESTING */ 1131 rbuf = os_zalloc(buf_len + 1); 1132 if (rbuf == NULL) { 1133 wpa_tdls_peer_free(sm, peer); 1134 return -1; 1135 } 1136 pos = rbuf; 1137 1138 if (!wpa_tdls_get_privacy(sm)) 1139 goto skip_ies; 1140 1141 /* Initiator RSN IE */ 1142 pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len); 1143 1144 ftie = (struct wpa_tdls_ftie *) pos; 1145 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; 1146 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; 1147 1148 if (os_get_random(peer->inonce, WPA_NONCE_LEN)) { 1149 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1150 "TDLS: Failed to get random data for initiator Nonce"); 1151 os_free(rbuf); 1152 wpa_tdls_peer_free(sm, peer); 1153 return -1; 1154 } 1155 wpa_hexdump(MSG_DEBUG, "TDLS: Initiator Nonce for TPK handshake", 1156 peer->inonce, WPA_NONCE_LEN); 1157 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); 1158 1159 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK Handshake M1", 1160 (u8 *) ftie, sizeof(struct wpa_tdls_ftie)); 1161 1162 pos = (u8 *) (ftie + 1); 1163 1164#ifdef CONFIG_TDLS_TESTING 1165 if (tdls_testing & TDLS_TESTING_LONG_FRAME) { 1166 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " 1167 "FTIE"); 1168 ftie->ie_len += 170; 1169 *pos++ = 255; /* FTIE subelem */ 1170 *pos++ = 168; /* FTIE subelem length */ 1171 pos += 168; 1172 } 1173#endif /* CONFIG_TDLS_TESTING */ 1174 1175 /* Lifetime */ 1176 peer->lifetime = TPK_LIFETIME; 1177#ifdef CONFIG_TDLS_TESTING 1178 if (tdls_testing & TDLS_TESTING_SHORT_LIFETIME) { 1179 wpa_printf(MSG_DEBUG, "TDLS: Testing - use short TPK " 1180 "lifetime"); 1181 peer->lifetime = 301; 1182 } 1183 if (tdls_testing & TDLS_TESTING_LONG_LIFETIME) { 1184 wpa_printf(MSG_DEBUG, "TDLS: Testing - use long TPK " 1185 "lifetime"); 1186 peer->lifetime = 0xffffffff; 1187 } 1188#endif /* CONFIG_TDLS_TESTING */ 1189 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, 1190 sizeof(timeoutie), peer->lifetime); 1191 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime); 1192 1193skip_ies: 1194 1195#ifdef CONFIG_TDLS_TESTING 1196 if (tdls_testing & TDLS_TESTING_DIFF_BSSID) { 1197 wpa_printf(MSG_DEBUG, "TDLS: Testing - use incorrect BSSID in " 1198 "Link Identifier"); 1199 struct wpa_tdls_lnkid *l = (struct wpa_tdls_lnkid *) pos; 1200 wpa_tdls_linkid(sm, peer, l); 1201 l->bssid[5] ^= 0x01; 1202 pos += sizeof(*l); 1203 } 1204#endif /* CONFIG_TDLS_TESTING */ 1205 1206 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Request / TPK " 1207 "Handshake Message 1 (peer " MACSTR ")", 1208 MAC2STR(peer->addr)); 1209 1210 status = wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_SETUP_REQUEST, 1211 1, 0, 0, peer->initiator, rbuf, pos - rbuf); 1212 os_free(rbuf); 1213 1214 return status; 1215} 1216 1217 1218static int wpa_tdls_send_tpk_m2(struct wpa_sm *sm, 1219 const unsigned char *src_addr, u8 dtoken, 1220 struct wpa_tdls_lnkid *lnkid, 1221 const struct wpa_tdls_peer *peer) 1222{ 1223 u8 *rbuf, *pos; 1224 size_t buf_len; 1225 u32 lifetime; 1226 struct wpa_tdls_timeoutie timeoutie; 1227 struct wpa_tdls_ftie *ftie; 1228 int status; 1229 1230 buf_len = 0; 1231 if (wpa_tdls_get_privacy(sm)) { 1232 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce), 1233 * Lifetime */ 1234 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) + 1235 sizeof(struct wpa_tdls_timeoutie); 1236#ifdef CONFIG_TDLS_TESTING 1237 if (tdls_testing & TDLS_TESTING_LONG_FRAME) 1238 buf_len += 170; 1239#endif /* CONFIG_TDLS_TESTING */ 1240 } 1241 1242 rbuf = os_zalloc(buf_len + 1); 1243 if (rbuf == NULL) 1244 return -1; 1245 pos = rbuf; 1246 1247 if (!wpa_tdls_get_privacy(sm)) 1248 goto skip_ies; 1249 1250 /* Peer RSN IE */ 1251 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len); 1252 1253 ftie = (struct wpa_tdls_ftie *) pos; 1254 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; 1255 /* TODO: ftie->mic_control to set 2-RESPONSE */ 1256 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN); 1257 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); 1258 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; 1259 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK M2", 1260 (u8 *) ftie, sizeof(*ftie)); 1261 1262 pos = (u8 *) (ftie + 1); 1263 1264#ifdef CONFIG_TDLS_TESTING 1265 if (tdls_testing & TDLS_TESTING_LONG_FRAME) { 1266 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " 1267 "FTIE"); 1268 ftie->ie_len += 170; 1269 *pos++ = 255; /* FTIE subelem */ 1270 *pos++ = 168; /* FTIE subelem length */ 1271 pos += 168; 1272 } 1273#endif /* CONFIG_TDLS_TESTING */ 1274 1275 /* Lifetime */ 1276 lifetime = peer->lifetime; 1277#ifdef CONFIG_TDLS_TESTING 1278 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_RESP) { 1279 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK " 1280 "lifetime in response"); 1281 lifetime++; 1282 } 1283#endif /* CONFIG_TDLS_TESTING */ 1284 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, 1285 sizeof(timeoutie), lifetime); 1286 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds from initiator", 1287 lifetime); 1288 1289 /* compute MIC before sending */ 1290 wpa_tdls_ftie_mic(peer->tpk.kck, 2, (u8 *) lnkid, peer->rsnie_p, 1291 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic); 1292#ifdef CONFIG_TDLS_TESTING 1293 if (tdls_testing & TDLS_TESTING_WRONG_MIC) { 1294 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong MIC"); 1295 ftie->mic[0] ^= 0x01; 1296 } 1297#endif /* CONFIG_TDLS_TESTING */ 1298 1299skip_ies: 1300 status = wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, 1301 dtoken, 0, 0, peer->initiator, rbuf, 1302 pos - rbuf); 1303 os_free(rbuf); 1304 1305 return status; 1306} 1307 1308 1309static int wpa_tdls_send_tpk_m3(struct wpa_sm *sm, 1310 const unsigned char *src_addr, u8 dtoken, 1311 struct wpa_tdls_lnkid *lnkid, 1312 const struct wpa_tdls_peer *peer) 1313{ 1314 u8 *rbuf, *pos; 1315 size_t buf_len; 1316 struct wpa_tdls_ftie *ftie; 1317 struct wpa_tdls_timeoutie timeoutie; 1318 u32 lifetime; 1319 int status; 1320 u32 peer_capab = 0; 1321 1322 buf_len = 0; 1323 if (wpa_tdls_get_privacy(sm)) { 1324 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce), 1325 * Lifetime */ 1326 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) + 1327 sizeof(struct wpa_tdls_timeoutie); 1328#ifdef CONFIG_TDLS_TESTING 1329 if (tdls_testing & TDLS_TESTING_LONG_FRAME) 1330 buf_len += 170; 1331#endif /* CONFIG_TDLS_TESTING */ 1332 } 1333 1334 rbuf = os_zalloc(buf_len + 1); 1335 if (rbuf == NULL) 1336 return -1; 1337 pos = rbuf; 1338 1339 if (!wpa_tdls_get_privacy(sm)) 1340 goto skip_ies; 1341 1342 /* Peer RSN IE */ 1343 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len); 1344 1345 ftie = (struct wpa_tdls_ftie *) pos; 1346 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; 1347 /*TODO: ftie->mic_control to set 3-CONFIRM */ 1348 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN); 1349 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); 1350 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; 1351 1352 pos = (u8 *) (ftie + 1); 1353 1354#ifdef CONFIG_TDLS_TESTING 1355 if (tdls_testing & TDLS_TESTING_LONG_FRAME) { 1356 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " 1357 "FTIE"); 1358 ftie->ie_len += 170; 1359 *pos++ = 255; /* FTIE subelem */ 1360 *pos++ = 168; /* FTIE subelem length */ 1361 pos += 168; 1362 } 1363#endif /* CONFIG_TDLS_TESTING */ 1364 1365 /* Lifetime */ 1366 lifetime = peer->lifetime; 1367#ifdef CONFIG_TDLS_TESTING 1368 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_CONF) { 1369 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK " 1370 "lifetime in confirm"); 1371 lifetime++; 1372 } 1373#endif /* CONFIG_TDLS_TESTING */ 1374 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, 1375 sizeof(timeoutie), lifetime); 1376 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", 1377 lifetime); 1378 1379 /* compute MIC before sending */ 1380 wpa_tdls_ftie_mic(peer->tpk.kck, 3, (u8 *) lnkid, peer->rsnie_p, 1381 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic); 1382#ifdef CONFIG_TDLS_TESTING 1383 if (tdls_testing & TDLS_TESTING_WRONG_MIC) { 1384 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong MIC"); 1385 ftie->mic[0] ^= 0x01; 1386 } 1387#endif /* CONFIG_TDLS_TESTING */ 1388 1389skip_ies: 1390 1391 if (peer->vht_capabilities) 1392 peer_capab |= TDLS_PEER_VHT; 1393 if (peer->ht_capabilities) 1394 peer_capab |= TDLS_PEER_HT; 1395 if (peer->wmm_capable) 1396 peer_capab |= TDLS_PEER_WMM; 1397 1398 status = wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, 1399 dtoken, 0, peer_capab, peer->initiator, 1400 rbuf, pos - rbuf); 1401 os_free(rbuf); 1402 1403 return status; 1404} 1405 1406 1407static int wpa_tdls_send_discovery_response(struct wpa_sm *sm, 1408 struct wpa_tdls_peer *peer, 1409 u8 dialog_token) 1410{ 1411 size_t buf_len = 0; 1412 struct wpa_tdls_timeoutie timeoutie; 1413 u16 rsn_capab; 1414 u8 *rbuf, *pos, *count_pos; 1415 u16 count; 1416 struct rsn_ie_hdr *hdr; 1417 int status; 1418 1419 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Discovery Response " 1420 "(peer " MACSTR ")", MAC2STR(peer->addr)); 1421 if (!wpa_tdls_get_privacy(sm)) 1422 goto skip_rsn_ies; 1423 1424 /* Filling RSN IE */ 1425 hdr = (struct rsn_ie_hdr *) peer->rsnie_i; 1426 hdr->elem_id = WLAN_EID_RSN; 1427 WPA_PUT_LE16(hdr->version, RSN_VERSION); 1428 pos = (u8 *) (hdr + 1); 1429 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED); 1430 pos += RSN_SELECTOR_LEN; 1431 count_pos = pos; 1432 pos += 2; 1433 count = 0; 1434 1435 /* 1436 * AES-CCMP is the default encryption preferred for TDLS, so 1437 * RSN IE is filled only with CCMP cipher suite. 1438 * Note: TKIP is not used to encrypt TDLS link. 1439 * 1440 * Regardless of the cipher used on the AP connection, select CCMP 1441 * here. 1442 */ 1443 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 1444 pos += RSN_SELECTOR_LEN; 1445 count++; 1446 WPA_PUT_LE16(count_pos, count); 1447 WPA_PUT_LE16(pos, 1); 1448 pos += 2; 1449 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE); 1450 pos += RSN_SELECTOR_LEN; 1451 1452 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; 1453 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2; 1454 WPA_PUT_LE16(pos, rsn_capab); 1455 pos += 2; 1456 hdr->len = (pos - (u8 *) hdr) - 2; 1457 peer->rsnie_i_len = pos - peer->rsnie_i; 1458 1459 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for Discovery Response", 1460 (u8 *) hdr, hdr->len + 2); 1461skip_rsn_ies: 1462 buf_len = 0; 1463 if (wpa_tdls_get_privacy(sm)) { 1464 /* Peer RSN IE, Lifetime */ 1465 buf_len += peer->rsnie_i_len + 1466 sizeof(struct wpa_tdls_timeoutie); 1467 } 1468 rbuf = os_zalloc(buf_len + 1); 1469 if (rbuf == NULL) { 1470 wpa_tdls_peer_free(sm, peer); 1471 return -1; 1472 } 1473 pos = rbuf; 1474 1475 if (!wpa_tdls_get_privacy(sm)) 1476 goto skip_ies; 1477 /* Initiator RSN IE */ 1478 pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len); 1479 /* Lifetime */ 1480 peer->lifetime = TPK_LIFETIME; 1481 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, 1482 sizeof(timeoutie), peer->lifetime); 1483 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime); 1484skip_ies: 1485 status = wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_DISCOVERY_RESPONSE, 1486 dialog_token, 0, 0, 0, rbuf, pos - rbuf); 1487 os_free(rbuf); 1488 1489 return status; 1490} 1491 1492 1493static int 1494wpa_tdls_process_discovery_request(struct wpa_sm *sm, const u8 *addr, 1495 const u8 *buf, size_t len) 1496{ 1497 struct wpa_eapol_ie_parse kde; 1498 const struct wpa_tdls_lnkid *lnkid; 1499 struct wpa_tdls_peer *peer; 1500 size_t min_req_len = sizeof(struct wpa_tdls_frame) + 1501 1 /* dialog token */ + sizeof(struct wpa_tdls_lnkid); 1502 u8 dialog_token; 1503 1504 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from " MACSTR, 1505 MAC2STR(addr)); 1506 1507 if (len < min_req_len) { 1508 wpa_printf(MSG_DEBUG, "TDLS Discovery Request is too short: " 1509 "%d", (int) len); 1510 return -1; 1511 } 1512 1513 dialog_token = buf[sizeof(struct wpa_tdls_frame)]; 1514 1515 /* 1516 * Some APs will tack on a weird IE to the end of a TDLS 1517 * discovery request packet. This needn't fail the response, 1518 * since the required IE are verified separately. 1519 */ 1520 if (wpa_supplicant_parse_ies(buf + sizeof(struct wpa_tdls_frame) + 1, 1521 len - (sizeof(struct wpa_tdls_frame) + 1), 1522 &kde) < 0) { 1523 wpa_printf(MSG_DEBUG, 1524 "TDLS: Failed to parse IEs in Discovery Request - ignore as an interop workaround"); 1525 } 1526 1527 if (!kde.lnkid) { 1528 wpa_printf(MSG_DEBUG, "TDLS: Link ID not found in Discovery " 1529 "Request"); 1530 return -1; 1531 } 1532 1533 lnkid = (const struct wpa_tdls_lnkid *) kde.lnkid; 1534 1535 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { 1536 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from different " 1537 " BSS " MACSTR, MAC2STR(lnkid->bssid)); 1538 return -1; 1539 } 1540 1541 peer = wpa_tdls_add_peer(sm, addr, NULL); 1542 if (peer == NULL) 1543 return -1; 1544 1545 return wpa_tdls_send_discovery_response(sm, peer, dialog_token); 1546} 1547 1548 1549int wpa_tdls_send_discovery_request(struct wpa_sm *sm, const u8 *addr) 1550{ 1551 if (sm->tdls_disabled || !sm->tdls_supported) 1552 return -1; 1553 1554 wpa_printf(MSG_DEBUG, "TDLS: Sending Discovery Request to peer " 1555 MACSTR, MAC2STR(addr)); 1556 return wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_DISCOVERY_REQUEST, 1557 1, 0, 0, 1, NULL, 0); 1558} 1559 1560 1561static int copy_supp_rates(const struct wpa_eapol_ie_parse *kde, 1562 struct wpa_tdls_peer *peer) 1563{ 1564 if (!kde->supp_rates) { 1565 wpa_printf(MSG_DEBUG, "TDLS: No supported rates received"); 1566 return -1; 1567 } 1568 peer->supp_rates_len = merge_byte_arrays( 1569 peer->supp_rates, sizeof(peer->supp_rates), 1570 kde->supp_rates + 2, kde->supp_rates_len - 2, 1571 kde->ext_supp_rates ? kde->ext_supp_rates + 2 : NULL, 1572 kde->ext_supp_rates_len - 2); 1573 return 0; 1574} 1575 1576 1577static int copy_peer_ht_capab(const struct wpa_eapol_ie_parse *kde, 1578 struct wpa_tdls_peer *peer) 1579{ 1580 if (!kde->ht_capabilities || 1581 kde->ht_capabilities_len < 1582 sizeof(struct ieee80211_ht_capabilities) ) { 1583 wpa_printf(MSG_DEBUG, "TDLS: No supported ht capabilities " 1584 "received"); 1585 return 0; 1586 } 1587 1588 if (!peer->ht_capabilities) { 1589 peer->ht_capabilities = 1590 os_zalloc(sizeof(struct ieee80211_ht_capabilities)); 1591 if (peer->ht_capabilities == NULL) 1592 return -1; 1593 } 1594 1595 os_memcpy(peer->ht_capabilities, kde->ht_capabilities, 1596 sizeof(struct ieee80211_ht_capabilities)); 1597 wpa_hexdump(MSG_DEBUG, "TDLS: Peer HT capabilities", 1598 (u8 *) peer->ht_capabilities, 1599 sizeof(struct ieee80211_ht_capabilities)); 1600 1601 return 0; 1602} 1603 1604 1605static int copy_peer_vht_capab(const struct wpa_eapol_ie_parse *kde, 1606 struct wpa_tdls_peer *peer) 1607{ 1608 if (!kde->vht_capabilities || 1609 kde->vht_capabilities_len < 1610 sizeof(struct ieee80211_vht_capabilities) ) { 1611 wpa_printf(MSG_DEBUG, "TDLS: No supported vht capabilities " 1612 "received"); 1613 return 0; 1614 } 1615 1616 if (!peer->vht_capabilities) { 1617 peer->vht_capabilities = 1618 os_zalloc(sizeof(struct ieee80211_vht_capabilities)); 1619 if (peer->vht_capabilities == NULL) 1620 return -1; 1621 } 1622 1623 os_memcpy(peer->vht_capabilities, kde->vht_capabilities, 1624 sizeof(struct ieee80211_vht_capabilities)); 1625 wpa_hexdump(MSG_DEBUG, "TDLS: Peer VHT capabilities", 1626 (u8 *) peer->vht_capabilities, 1627 sizeof(struct ieee80211_vht_capabilities)); 1628 1629 return 0; 1630} 1631 1632 1633static int copy_peer_ext_capab(const struct wpa_eapol_ie_parse *kde, 1634 struct wpa_tdls_peer *peer) 1635{ 1636 if (!kde->ext_capab) { 1637 wpa_printf(MSG_DEBUG, "TDLS: No extended capabilities " 1638 "received"); 1639 return 0; 1640 } 1641 1642 if (!peer->ext_capab || peer->ext_capab_len < kde->ext_capab_len - 2) { 1643 /* Need to allocate buffer to fit the new information */ 1644 os_free(peer->ext_capab); 1645 peer->ext_capab = os_zalloc(kde->ext_capab_len - 2); 1646 if (peer->ext_capab == NULL) 1647 return -1; 1648 } 1649 1650 peer->ext_capab_len = kde->ext_capab_len - 2; 1651 os_memcpy(peer->ext_capab, kde->ext_capab + 2, peer->ext_capab_len); 1652 1653 return 0; 1654} 1655 1656 1657static int copy_peer_wmm_capab(const struct wpa_eapol_ie_parse *kde, 1658 struct wpa_tdls_peer *peer) 1659{ 1660 struct wmm_information_element *wmm; 1661 1662 if (!kde->wmm) { 1663 wpa_printf(MSG_DEBUG, "TDLS: No supported WMM capabilities received"); 1664 return 0; 1665 } 1666 1667 if (kde->wmm_len < sizeof(struct wmm_information_element)) { 1668 wpa_printf(MSG_DEBUG, "TDLS: Invalid supported WMM capabilities received"); 1669 return -1; 1670 } 1671 1672 wmm = (struct wmm_information_element *) kde->wmm; 1673 peer->qos_info = wmm->qos_info; 1674 1675 peer->wmm_capable = 1; 1676 1677 wpa_printf(MSG_DEBUG, "TDLS: Peer WMM QOS Info 0x%x", peer->qos_info); 1678 return 0; 1679} 1680 1681 1682static int copy_peer_supp_channels(const struct wpa_eapol_ie_parse *kde, 1683 struct wpa_tdls_peer *peer) 1684{ 1685 if (!kde->supp_channels) { 1686 wpa_printf(MSG_DEBUG, "TDLS: No supported channels received"); 1687 return 0; 1688 } 1689 1690 if (!peer->supp_channels || 1691 peer->supp_channels_len < kde->supp_channels_len) { 1692 os_free(peer->supp_channels); 1693 peer->supp_channels = os_zalloc(kde->supp_channels_len); 1694 if (peer->supp_channels == NULL) 1695 return -1; 1696 } 1697 1698 peer->supp_channels_len = kde->supp_channels_len; 1699 1700 os_memcpy(peer->supp_channels, kde->supp_channels, 1701 peer->supp_channels_len); 1702 wpa_hexdump(MSG_DEBUG, "TDLS: Peer Supported Channels", 1703 (u8 *) peer->supp_channels, peer->supp_channels_len); 1704 return 0; 1705} 1706 1707 1708static int copy_peer_supp_oper_classes(const struct wpa_eapol_ie_parse *kde, 1709 struct wpa_tdls_peer *peer) 1710{ 1711 if (!kde->supp_oper_classes) { 1712 wpa_printf(MSG_DEBUG, "TDLS: No supported operating classes received"); 1713 return 0; 1714 } 1715 1716 if (!peer->supp_oper_classes || 1717 peer->supp_oper_classes_len < kde->supp_oper_classes_len) { 1718 os_free(peer->supp_oper_classes); 1719 peer->supp_oper_classes = os_zalloc(kde->supp_oper_classes_len); 1720 if (peer->supp_oper_classes == NULL) 1721 return -1; 1722 } 1723 1724 peer->supp_oper_classes_len = kde->supp_oper_classes_len; 1725 os_memcpy(peer->supp_oper_classes, kde->supp_oper_classes, 1726 peer->supp_oper_classes_len); 1727 wpa_hexdump(MSG_DEBUG, "TDLS: Peer Supported Operating Classes", 1728 (u8 *) peer->supp_oper_classes, 1729 peer->supp_oper_classes_len); 1730 return 0; 1731} 1732 1733 1734static int wpa_tdls_addset_peer(struct wpa_sm *sm, struct wpa_tdls_peer *peer, 1735 int add) 1736{ 1737 return wpa_sm_tdls_peer_addset(sm, peer->addr, add, peer->aid, 1738 peer->capability, 1739 peer->supp_rates, peer->supp_rates_len, 1740 peer->ht_capabilities, 1741 peer->vht_capabilities, 1742 peer->qos_info, peer->wmm_capable, 1743 peer->ext_capab, peer->ext_capab_len, 1744 peer->supp_channels, 1745 peer->supp_channels_len, 1746 peer->supp_oper_classes, 1747 peer->supp_oper_classes_len); 1748} 1749 1750 1751static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr, 1752 const u8 *buf, size_t len) 1753{ 1754 struct wpa_tdls_peer *peer; 1755 struct wpa_eapol_ie_parse kde; 1756 struct wpa_ie_data ie; 1757 int cipher; 1758 const u8 *cpos; 1759 struct wpa_tdls_ftie *ftie = NULL; 1760 struct wpa_tdls_timeoutie *timeoutie; 1761 struct wpa_tdls_lnkid *lnkid; 1762 u32 lifetime = 0; 1763#if 0 1764 struct rsn_ie_hdr *hdr; 1765 u8 *pos; 1766 u16 rsn_capab; 1767 u16 rsn_ver; 1768#endif 1769 u8 dtoken; 1770 u16 ielen; 1771 u16 status = WLAN_STATUS_UNSPECIFIED_FAILURE; 1772 int tdls_prohibited = sm->tdls_prohibited; 1773 int existing_peer = 0; 1774 1775 if (len < 3 + 3) 1776 return -1; 1777 1778 cpos = buf; 1779 cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; 1780 1781 /* driver had already verified the frame format */ 1782 dtoken = *cpos++; /* dialog token */ 1783 1784 wpa_printf(MSG_INFO, "TDLS: Dialog Token in TPK M1 %d", dtoken); 1785 1786 peer = wpa_tdls_add_peer(sm, src_addr, &existing_peer); 1787 if (peer == NULL) 1788 goto error; 1789 1790 /* If found, use existing entry instead of adding a new one; 1791 * how to handle the case where both ends initiate at the 1792 * same time? */ 1793 if (existing_peer) { 1794 if (peer->tpk_success) { 1795 wpa_printf(MSG_DEBUG, "TDLS: TDLS Setup Request while " 1796 "direct link is enabled - tear down the " 1797 "old link first"); 1798 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); 1799 wpa_tdls_peer_clear(sm, peer); 1800 } else if (peer->initiator) { 1801 /* 1802 * An entry is already present, so check if we already 1803 * sent a TDLS Setup Request. If so, compare MAC 1804 * addresses and let the STA with the lower MAC address 1805 * continue as the initiator. The other negotiation is 1806 * terminated. 1807 */ 1808 if (os_memcmp(sm->own_addr, src_addr, ETH_ALEN) < 0) { 1809 wpa_printf(MSG_DEBUG, "TDLS: Discard request " 1810 "from peer with higher address " 1811 MACSTR, MAC2STR(src_addr)); 1812 return -1; 1813 } else { 1814 wpa_printf(MSG_DEBUG, "TDLS: Accept request " 1815 "from peer with lower address " 1816 MACSTR " (terminate previously " 1817 "initiated negotiation", 1818 MAC2STR(src_addr)); 1819 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, 1820 peer->addr); 1821 wpa_tdls_peer_clear(sm, peer); 1822 } 1823 } 1824 } 1825 1826 /* capability information */ 1827 peer->capability = WPA_GET_LE16(cpos); 1828 cpos += 2; 1829 1830 ielen = len - (cpos - buf); /* start of IE in buf */ 1831 1832 /* 1833 * Don't reject the message if failing to parse IEs. The IEs we need are 1834 * explicitly checked below. Some APs may add arbitrary padding to the 1835 * end of short TDLS frames and that would look like invalid IEs. 1836 */ 1837 if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0) 1838 wpa_printf(MSG_DEBUG, 1839 "TDLS: Failed to parse IEs in TPK M1 - ignore as an interop workaround"); 1840 1841 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { 1842 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in " 1843 "TPK M1"); 1844 goto error; 1845 } 1846 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M1", 1847 kde.lnkid, kde.lnkid_len); 1848 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; 1849 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { 1850 wpa_printf(MSG_INFO, "TDLS: TPK M1 from diff BSS"); 1851 status = WLAN_STATUS_REQUEST_DECLINED; 1852 goto error; 1853 } 1854 1855 wpa_printf(MSG_DEBUG, "TDLS: TPK M1 - TPK initiator " MACSTR, 1856 MAC2STR(src_addr)); 1857 1858 if (copy_supp_rates(&kde, peer) < 0) 1859 goto error; 1860 1861 if (copy_peer_ht_capab(&kde, peer) < 0) 1862 goto error; 1863 1864 if (copy_peer_vht_capab(&kde, peer) < 0) 1865 goto error; 1866 1867 if (copy_peer_ext_capab(&kde, peer) < 0) 1868 goto error; 1869 1870 if (copy_peer_supp_channels(&kde, peer) < 0) 1871 goto error; 1872 1873 if (copy_peer_supp_oper_classes(&kde, peer) < 0) 1874 goto error; 1875 1876 peer->qos_info = kde.qosinfo; 1877 1878 /* Overwrite with the qos_info obtained in WMM IE */ 1879 if (copy_peer_wmm_capab(&kde, peer) < 0) 1880 goto error; 1881 1882 peer->aid = kde.aid; 1883 1884#ifdef CONFIG_TDLS_TESTING 1885 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) { 1886 peer = wpa_tdls_add_peer(sm, src_addr, NULL); 1887 if (peer == NULL) 1888 goto error; 1889 wpa_printf(MSG_DEBUG, "TDLS: Testing concurrent initiation of " 1890 "TDLS setup - send own request"); 1891 peer->initiator = 1; 1892 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL, 1893 NULL, 0, 0, NULL, 0, NULL, 0, NULL, 0); 1894 wpa_tdls_send_tpk_m1(sm, peer); 1895 } 1896 1897 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) && 1898 tdls_prohibited) { 1899 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition " 1900 "on TDLS"); 1901 tdls_prohibited = 0; 1902 } 1903#endif /* CONFIG_TDLS_TESTING */ 1904 1905 if (tdls_prohibited) { 1906 wpa_printf(MSG_INFO, "TDLS: TDLS prohibited in this BSS"); 1907 status = WLAN_STATUS_REQUEST_DECLINED; 1908 goto error; 1909 } 1910 1911 if (!wpa_tdls_get_privacy(sm)) { 1912 if (kde.rsn_ie) { 1913 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M1 while " 1914 "security is disabled"); 1915 status = WLAN_STATUS_SECURITY_DISABLED; 1916 goto error; 1917 } 1918 goto skip_rsn; 1919 } 1920 1921 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) || 1922 kde.rsn_ie == NULL) { 1923 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M1"); 1924 status = WLAN_STATUS_INVALID_PARAMETERS; 1925 goto error; 1926 } 1927 1928 if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) { 1929 wpa_printf(MSG_INFO, "TDLS: Too long Initiator RSN IE in " 1930 "TPK M1"); 1931 status = WLAN_STATUS_INVALID_RSNIE; 1932 goto error; 1933 } 1934 1935 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) { 1936 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M1"); 1937 status = WLAN_STATUS_INVALID_RSNIE; 1938 goto error; 1939 } 1940 1941 cipher = ie.pairwise_cipher; 1942 if (cipher & WPA_CIPHER_CCMP) { 1943 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link"); 1944 cipher = WPA_CIPHER_CCMP; 1945 } else { 1946 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M1"); 1947 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID; 1948 goto error; 1949 } 1950 1951 if ((ie.capabilities & 1952 (WPA_CAPABILITY_NO_PAIRWISE | WPA_CAPABILITY_PEERKEY_ENABLED)) != 1953 WPA_CAPABILITY_PEERKEY_ENABLED) { 1954 wpa_printf(MSG_INFO, "TDLS: Invalid RSN Capabilities in " 1955 "TPK M1"); 1956 status = WLAN_STATUS_INVALID_RSN_IE_CAPAB; 1957 goto error; 1958 } 1959 1960 /* Lifetime */ 1961 if (kde.key_lifetime == NULL) { 1962 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1"); 1963 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; 1964 goto error; 1965 } 1966 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime; 1967 lifetime = WPA_GET_LE32(timeoutie->value); 1968 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime); 1969 if (lifetime < 300) { 1970 wpa_printf(MSG_INFO, "TDLS: Too short TPK lifetime"); 1971 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; 1972 goto error; 1973 } 1974 1975skip_rsn: 1976#ifdef CONFIG_TDLS_TESTING 1977 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) { 1978 if (os_memcmp(sm->own_addr, peer->addr, ETH_ALEN) < 0) { 1979 /* 1980 * The request frame from us is going to win, so do not 1981 * replace information based on this request frame from 1982 * the peer. 1983 */ 1984 goto skip_rsn_check; 1985 } 1986 } 1987#endif /* CONFIG_TDLS_TESTING */ 1988 1989 peer->initiator = 0; /* Need to check */ 1990 peer->dtoken = dtoken; 1991 1992 if (!wpa_tdls_get_privacy(sm)) { 1993 peer->rsnie_i_len = 0; 1994 peer->rsnie_p_len = 0; 1995 peer->cipher = WPA_CIPHER_NONE; 1996 goto skip_rsn_check; 1997 } 1998 1999 ftie = (struct wpa_tdls_ftie *) kde.ftie; 2000 os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len); 2001 peer->rsnie_i_len = kde.rsn_ie_len; 2002 peer->cipher = cipher; 2003 2004 if (os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) != 0) { 2005 /* 2006 * There is no point in updating the RNonce for every obtained 2007 * TPK M1 frame (e.g., retransmission due to timeout) with the 2008 * same INonce (SNonce in FTIE). However, if the TPK M1 is 2009 * retransmitted with a different INonce, update the RNonce 2010 * since this is for a new TDLS session. 2011 */ 2012 wpa_printf(MSG_DEBUG, 2013 "TDLS: New TPK M1 INonce - generate new RNonce"); 2014 os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN); 2015 if (os_get_random(peer->rnonce, WPA_NONCE_LEN)) { 2016 wpa_msg(sm->ctx->ctx, MSG_WARNING, 2017 "TDLS: Failed to get random data for responder nonce"); 2018 goto error; 2019 } 2020 } 2021 2022#if 0 2023 /* get version info from RSNIE received from Peer */ 2024 hdr = (struct rsn_ie_hdr *) kde.rsn_ie; 2025 rsn_ver = WPA_GET_LE16(hdr->version); 2026 2027 /* use min(peer's version, out version) */ 2028 if (rsn_ver > RSN_VERSION) 2029 rsn_ver = RSN_VERSION; 2030 2031 hdr = (struct rsn_ie_hdr *) peer->rsnie_p; 2032 2033 hdr->elem_id = WLAN_EID_RSN; 2034 WPA_PUT_LE16(hdr->version, rsn_ver); 2035 pos = (u8 *) (hdr + 1); 2036 2037 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED); 2038 pos += RSN_SELECTOR_LEN; 2039 /* Include only the selected cipher in pairwise cipher suite */ 2040 WPA_PUT_LE16(pos, 1); 2041 pos += 2; 2042 if (cipher == WPA_CIPHER_CCMP) 2043 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 2044 pos += RSN_SELECTOR_LEN; 2045 2046 WPA_PUT_LE16(pos, 1); 2047 pos += 2; 2048 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE); 2049 pos += RSN_SELECTOR_LEN; 2050 2051 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; 2052 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2; 2053 WPA_PUT_LE16(pos, rsn_capab); 2054 pos += 2; 2055 2056 hdr->len = (pos - peer->rsnie_p) - 2; 2057 peer->rsnie_p_len = pos - peer->rsnie_p; 2058#endif 2059 2060 /* temp fix: validation of RSNIE later */ 2061 os_memcpy(peer->rsnie_p, peer->rsnie_i, peer->rsnie_i_len); 2062 peer->rsnie_p_len = peer->rsnie_i_len; 2063 2064 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake", 2065 peer->rsnie_p, peer->rsnie_p_len); 2066 2067 peer->lifetime = lifetime; 2068 2069 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid); 2070 2071skip_rsn_check: 2072#ifdef CONFIG_TDLS_TESTING 2073 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) 2074 goto skip_add_peer; 2075#endif /* CONFIG_TDLS_TESTING */ 2076 2077 /* add supported rates, capabilities, and qos_info to the TDLS peer */ 2078 if (wpa_tdls_addset_peer(sm, peer, 1) < 0) 2079 goto error; 2080 2081#ifdef CONFIG_TDLS_TESTING 2082skip_add_peer: 2083#endif /* CONFIG_TDLS_TESTING */ 2084 peer->tpk_in_progress = 1; 2085 2086 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Response / TPK M2"); 2087 if (wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer) < 0) { 2088 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); 2089 goto error; 2090 } 2091 2092 return 0; 2093 2094error: 2095 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0, 2096 status); 2097 if (peer) 2098 wpa_tdls_peer_free(sm, peer); 2099 return -1; 2100} 2101 2102 2103static int wpa_tdls_enable_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer) 2104{ 2105 peer->tpk_success = 1; 2106 peer->tpk_in_progress = 0; 2107 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer); 2108 if (wpa_tdls_get_privacy(sm)) { 2109 u32 lifetime = peer->lifetime; 2110 /* 2111 * Start the initiator process a bit earlier to avoid race 2112 * condition with the responder sending teardown request. 2113 */ 2114 if (lifetime > 3 && peer->initiator) 2115 lifetime -= 3; 2116 eloop_register_timeout(lifetime, 0, wpa_tdls_tpk_timeout, 2117 sm, peer); 2118#ifdef CONFIG_TDLS_TESTING 2119 if (tdls_testing & TDLS_TESTING_NO_TPK_EXPIRATION) { 2120 wpa_printf(MSG_DEBUG, "TDLS: Testing - disable TPK " 2121 "expiration"); 2122 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer); 2123 } 2124#endif /* CONFIG_TDLS_TESTING */ 2125 } 2126 2127 if (peer->reconfig_key && wpa_tdls_set_key(sm, peer) < 0) { 2128 wpa_printf(MSG_INFO, "TDLS: Could not configure key to the " 2129 "driver"); 2130 return -1; 2131 } 2132 peer->reconfig_key = 0; 2133 2134 return wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, peer->addr); 2135} 2136 2137 2138static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr, 2139 const u8 *buf, size_t len) 2140{ 2141 struct wpa_tdls_peer *peer; 2142 struct wpa_eapol_ie_parse kde; 2143 struct wpa_ie_data ie; 2144 int cipher; 2145 struct wpa_tdls_ftie *ftie; 2146 struct wpa_tdls_timeoutie *timeoutie; 2147 struct wpa_tdls_lnkid *lnkid; 2148 u32 lifetime; 2149 u8 dtoken; 2150 int ielen; 2151 u16 status; 2152 const u8 *pos; 2153 int ret = 0; 2154 2155 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Response / TPK M2 " 2156 "(Peer " MACSTR ")", MAC2STR(src_addr)); 2157 for (peer = sm->tdls; peer; peer = peer->next) { 2158 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) 2159 break; 2160 } 2161 if (peer == NULL) { 2162 wpa_printf(MSG_INFO, "TDLS: No matching peer found for " 2163 "TPK M2: " MACSTR, MAC2STR(src_addr)); 2164 return -1; 2165 } 2166 if (!peer->initiator) { 2167 /* 2168 * This may happen if both devices try to initiate TDLS at the 2169 * same time and we accept the TPK M1 from the peer in 2170 * wpa_tdls_process_tpk_m1() and clear our previous state. 2171 */ 2172 wpa_printf(MSG_INFO, "TDLS: We were not the initiator, so " 2173 "ignore TPK M2 from " MACSTR, MAC2STR(src_addr)); 2174 return -1; 2175 } 2176 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_REQUEST); 2177 2178 if (len < 3 + 2 + 1) { 2179 wpa_tdls_disable_peer_link(sm, peer); 2180 return -1; 2181 } 2182 2183 pos = buf; 2184 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; 2185 status = WPA_GET_LE16(pos); 2186 pos += 2 /* status code */; 2187 2188 if (status != WLAN_STATUS_SUCCESS) { 2189 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M2: %u", 2190 status); 2191 wpa_tdls_disable_peer_link(sm, peer); 2192 return -1; 2193 } 2194 2195 status = WLAN_STATUS_UNSPECIFIED_FAILURE; 2196 2197 /* TODO: need to verify dialog token matches here or in kernel */ 2198 dtoken = *pos++; /* dialog token */ 2199 2200 wpa_printf(MSG_DEBUG, "TDLS: Dialog Token in TPK M2 %d", dtoken); 2201 2202 if (len < 3 + 2 + 1 + 2) { 2203 wpa_tdls_disable_peer_link(sm, peer); 2204 return -1; 2205 } 2206 2207 /* capability information */ 2208 peer->capability = WPA_GET_LE16(pos); 2209 pos += 2; 2210 2211 ielen = len - (pos - buf); /* start of IE in buf */ 2212 2213 /* 2214 * Don't reject the message if failing to parse IEs. The IEs we need are 2215 * explicitly checked below. Some APs may add arbitrary padding to the 2216 * end of short TDLS frames and that would look like invalid IEs. 2217 */ 2218 if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0) 2219 wpa_printf(MSG_DEBUG, 2220 "TDLS: Failed to parse IEs in TPK M2 - ignore as an interop workaround"); 2221 2222#ifdef CONFIG_TDLS_TESTING 2223 if (tdls_testing & TDLS_TESTING_DECLINE_RESP) { 2224 wpa_printf(MSG_DEBUG, "TDLS: Testing - decline response"); 2225 status = WLAN_STATUS_REQUEST_DECLINED; 2226 goto error; 2227 } 2228#endif /* CONFIG_TDLS_TESTING */ 2229 2230 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { 2231 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in " 2232 "TPK M2"); 2233 goto error; 2234 } 2235 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M2", 2236 kde.lnkid, kde.lnkid_len); 2237 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; 2238 2239 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { 2240 wpa_printf(MSG_INFO, "TDLS: TPK M2 from different BSS"); 2241 status = WLAN_STATUS_NOT_IN_SAME_BSS; 2242 goto error; 2243 } 2244 2245 if (copy_supp_rates(&kde, peer) < 0) 2246 goto error; 2247 2248 if (copy_peer_ht_capab(&kde, peer) < 0) 2249 goto error; 2250 2251 if (copy_peer_vht_capab(&kde, peer) < 0) 2252 goto error; 2253 2254 if (copy_peer_ext_capab(&kde, peer) < 0) 2255 goto error; 2256 2257 if (copy_peer_supp_channels(&kde, peer) < 0) 2258 goto error; 2259 2260 if (copy_peer_supp_oper_classes(&kde, peer) < 0) 2261 goto error; 2262 2263 peer->qos_info = kde.qosinfo; 2264 2265 /* Overwrite with the qos_info obtained in WMM IE */ 2266 if (copy_peer_wmm_capab(&kde, peer) < 0) 2267 goto error; 2268 2269 peer->aid = kde.aid; 2270 2271 if (!wpa_tdls_get_privacy(sm)) { 2272 peer->rsnie_p_len = 0; 2273 peer->cipher = WPA_CIPHER_NONE; 2274 goto skip_rsn; 2275 } 2276 2277 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) || 2278 kde.rsn_ie == NULL) { 2279 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M2"); 2280 status = WLAN_STATUS_INVALID_PARAMETERS; 2281 goto error; 2282 } 2283 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2", 2284 kde.rsn_ie, kde.rsn_ie_len); 2285 2286 if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) { 2287 wpa_printf(MSG_INFO, 2288 "TDLS: Too long Responder RSN IE in TPK M2"); 2289 status = WLAN_STATUS_INVALID_RSNIE; 2290 goto error; 2291 } 2292 2293 /* 2294 * FIX: bitwise comparison of RSN IE is not the correct way of 2295 * validation this. It can be different, but certain fields must 2296 * match. Since we list only a single pairwise cipher in TPK M1, the 2297 * memcmp is likely to work in most cases, though. 2298 */ 2299 if (kde.rsn_ie_len != peer->rsnie_i_len || 2300 os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) != 0) { 2301 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M2 does " 2302 "not match with RSN IE used in TPK M1"); 2303 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Sent in TPK M1", 2304 peer->rsnie_i, peer->rsnie_i_len); 2305 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2", 2306 kde.rsn_ie, kde.rsn_ie_len); 2307 status = WLAN_STATUS_INVALID_RSNIE; 2308 goto error; 2309 } 2310 2311 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) { 2312 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M2"); 2313 status = WLAN_STATUS_INVALID_RSNIE; 2314 goto error; 2315 } 2316 2317 cipher = ie.pairwise_cipher; 2318 if (cipher == WPA_CIPHER_CCMP) { 2319 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link"); 2320 cipher = WPA_CIPHER_CCMP; 2321 } else { 2322 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M2"); 2323 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID; 2324 goto error; 2325 } 2326 2327 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M2", 2328 kde.ftie, sizeof(*ftie)); 2329 ftie = (struct wpa_tdls_ftie *) kde.ftie; 2330 2331 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) { 2332 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does " 2333 "not match with FTIE SNonce used in TPK M1"); 2334 /* Silently discard the frame */ 2335 return -1; 2336 } 2337 2338 /* Responder Nonce and RSN IE */ 2339 os_memcpy(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN); 2340 os_memcpy(peer->rsnie_p, kde.rsn_ie, kde.rsn_ie_len); 2341 peer->rsnie_p_len = kde.rsn_ie_len; 2342 peer->cipher = cipher; 2343 2344 /* Lifetime */ 2345 if (kde.key_lifetime == NULL) { 2346 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M2"); 2347 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; 2348 goto error; 2349 } 2350 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime; 2351 lifetime = WPA_GET_LE32(timeoutie->value); 2352 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M2", 2353 lifetime); 2354 if (lifetime != peer->lifetime) { 2355 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in " 2356 "TPK M2 (expected %u)", lifetime, peer->lifetime); 2357 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; 2358 goto error; 2359 } 2360 2361 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid); 2362 2363 /* Process MIC check to see if TPK M2 is right */ 2364 if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid, 2365 (u8 *) timeoutie, ftie) < 0) { 2366 /* Discard the frame */ 2367 wpa_tdls_del_key(sm, peer); 2368 wpa_tdls_disable_peer_link(sm, peer); 2369 return -1; 2370 } 2371 2372 if (wpa_tdls_set_key(sm, peer) < 0) { 2373 /* 2374 * Some drivers may not be able to config the key prior to full 2375 * STA entry having been configured. 2376 */ 2377 wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after " 2378 "STA entry is complete"); 2379 peer->reconfig_key = 1; 2380 } 2381 2382skip_rsn: 2383 peer->dtoken = dtoken; 2384 2385 /* add supported rates, capabilities, and qos_info to the TDLS peer */ 2386 if (wpa_tdls_addset_peer(sm, peer, 0) < 0) 2387 goto error; 2388 2389 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Confirm / " 2390 "TPK Handshake Message 3"); 2391 if (wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer) < 0) 2392 goto error; 2393 2394 if (!peer->tpk_success) { 2395 /* 2396 * Enable Link only when tpk_success is 0, signifying that this 2397 * processing of TPK M2 frame is not because of a retransmission 2398 * during TDLS setup handshake. 2399 */ 2400 ret = wpa_tdls_enable_link(sm, peer); 2401 if (ret < 0) { 2402 wpa_printf(MSG_DEBUG, "TDLS: Could not enable link"); 2403 wpa_tdls_do_teardown( 2404 sm, peer, 2405 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED); 2406 } 2407 } 2408 return ret; 2409 2410error: 2411 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 1, 2412 status); 2413 wpa_tdls_disable_peer_link(sm, peer); 2414 return -1; 2415} 2416 2417 2418static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr, 2419 const u8 *buf, size_t len) 2420{ 2421 struct wpa_tdls_peer *peer; 2422 struct wpa_eapol_ie_parse kde; 2423 struct wpa_tdls_ftie *ftie; 2424 struct wpa_tdls_timeoutie *timeoutie; 2425 struct wpa_tdls_lnkid *lnkid; 2426 int ielen; 2427 u16 status; 2428 const u8 *pos; 2429 u32 lifetime; 2430 int ret = 0; 2431 2432 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Confirm / TPK M3 " 2433 "(Peer " MACSTR ")", MAC2STR(src_addr)); 2434 for (peer = sm->tdls; peer; peer = peer->next) { 2435 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) 2436 break; 2437 } 2438 if (peer == NULL) { 2439 wpa_printf(MSG_INFO, "TDLS: No matching peer found for " 2440 "TPK M3: " MACSTR, MAC2STR(src_addr)); 2441 return -1; 2442 } 2443 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_RESPONSE); 2444 2445 if (len < 3 + 3) 2446 goto error; 2447 pos = buf; 2448 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; 2449 2450 status = WPA_GET_LE16(pos); 2451 2452 if (status != 0) { 2453 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M3: %u", 2454 status); 2455 goto error; 2456 } 2457 pos += 2 /* status code */ + 1 /* dialog token */; 2458 2459 ielen = len - (pos - buf); /* start of IE in buf */ 2460 2461 /* 2462 * Don't reject the message if failing to parse IEs. The IEs we need are 2463 * explicitly checked below. Some APs piggy-back broken IEs to the end 2464 * of a TDLS Confirm packet, which will fail the link if we don't ignore 2465 * this error. 2466 */ 2467 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) { 2468 wpa_printf(MSG_DEBUG, 2469 "TDLS: Failed to parse KDEs in TPK M3 - ignore as an interop workaround"); 2470 } 2471 2472 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { 2473 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M3"); 2474 goto error; 2475 } 2476 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M3", 2477 (u8 *) kde.lnkid, kde.lnkid_len); 2478 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; 2479 2480 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { 2481 wpa_printf(MSG_INFO, "TDLS: TPK M3 from diff BSS"); 2482 goto error; 2483 } 2484 2485 if (!wpa_tdls_get_privacy(sm)) 2486 goto skip_rsn; 2487 2488 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) { 2489 wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M3"); 2490 goto error; 2491 } 2492 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M3", 2493 kde.ftie, sizeof(*ftie)); 2494 ftie = (struct wpa_tdls_ftie *) kde.ftie; 2495 2496 if (kde.rsn_ie == NULL) { 2497 wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M3"); 2498 goto error; 2499 } 2500 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M3", 2501 kde.rsn_ie, kde.rsn_ie_len); 2502 if (kde.rsn_ie_len != peer->rsnie_p_len || 2503 os_memcmp(kde.rsn_ie, peer->rsnie_p, peer->rsnie_p_len) != 0) { 2504 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M3 does not match " 2505 "with the one sent in TPK M2"); 2506 goto error; 2507 } 2508 2509 if (!os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) { 2510 wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does " 2511 "not match with FTIE ANonce used in TPK M2"); 2512 goto error; 2513 } 2514 2515 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) { 2516 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M3 does not " 2517 "match with FTIE SNonce used in TPK M1"); 2518 goto error; 2519 } 2520 2521 if (kde.key_lifetime == NULL) { 2522 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M3"); 2523 goto error; 2524 } 2525 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime; 2526 wpa_hexdump(MSG_DEBUG, "TDLS: Timeout IE Received from TPK M3", 2527 (u8 *) timeoutie, sizeof(*timeoutie)); 2528 lifetime = WPA_GET_LE32(timeoutie->value); 2529 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M3", 2530 lifetime); 2531 if (lifetime != peer->lifetime) { 2532 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in " 2533 "TPK M3 (expected %u)", lifetime, peer->lifetime); 2534 goto error; 2535 } 2536 2537 if (wpa_supplicant_verify_tdls_mic(3, peer, (u8 *) lnkid, 2538 (u8 *) timeoutie, ftie) < 0) { 2539 wpa_tdls_del_key(sm, peer); 2540 goto error; 2541 } 2542 2543 if (wpa_tdls_set_key(sm, peer) < 0) { 2544 /* 2545 * Some drivers may not be able to config the key prior to full 2546 * STA entry having been configured. 2547 */ 2548 wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after " 2549 "STA entry is complete"); 2550 peer->reconfig_key = 1; 2551 } 2552 2553skip_rsn: 2554 /* add supported rates, capabilities, and qos_info to the TDLS peer */ 2555 if (wpa_tdls_addset_peer(sm, peer, 0) < 0) 2556 goto error; 2557 2558 if (!peer->tpk_success) { 2559 /* 2560 * Enable Link only when tpk_success is 0, signifying that this 2561 * processing of TPK M3 frame is not because of a retransmission 2562 * during TDLS setup handshake. 2563 */ 2564 ret = wpa_tdls_enable_link(sm, peer); 2565 if (ret < 0) { 2566 wpa_printf(MSG_DEBUG, "TDLS: Could not enable link"); 2567 goto error; 2568 } 2569 } 2570 return ret; 2571error: 2572 wpa_tdls_do_teardown(sm, peer, WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED); 2573 return -1; 2574} 2575 2576 2577static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs) 2578{ 2579 struct wpa_tdls_timeoutie *lifetime = (struct wpa_tdls_timeoutie *) ie; 2580 2581 os_memset(lifetime, 0, ie_len); 2582 lifetime->ie_type = WLAN_EID_TIMEOUT_INTERVAL; 2583 lifetime->ie_len = sizeof(struct wpa_tdls_timeoutie) - 2; 2584 lifetime->interval_type = WLAN_TIMEOUT_KEY_LIFETIME; 2585 WPA_PUT_LE32(lifetime->value, tsecs); 2586 os_memcpy(pos, ie, ie_len); 2587 return pos + ie_len; 2588} 2589 2590 2591/** 2592 * wpa_tdls_start - Initiate TDLS handshake (send TPK Handshake Message 1) 2593 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2594 * @peer: MAC address of the peer STA 2595 * Returns: 0 on success, or -1 on failure 2596 * 2597 * Send TPK Handshake Message 1 info to driver to start TDLS 2598 * handshake with the peer. 2599 */ 2600int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr) 2601{ 2602 struct wpa_tdls_peer *peer; 2603 int tdls_prohibited = sm->tdls_prohibited; 2604 2605 if (sm->tdls_disabled || !sm->tdls_supported) 2606 return -1; 2607 2608#ifdef CONFIG_TDLS_TESTING 2609 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) && 2610 tdls_prohibited) { 2611 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition " 2612 "on TDLS"); 2613 tdls_prohibited = 0; 2614 } 2615#endif /* CONFIG_TDLS_TESTING */ 2616 2617 if (tdls_prohibited) { 2618 wpa_printf(MSG_DEBUG, "TDLS: TDLS is prohibited in this BSS - " 2619 "reject request to start setup"); 2620 return -1; 2621 } 2622 2623 peer = wpa_tdls_add_peer(sm, addr, NULL); 2624 if (peer == NULL) 2625 return -1; 2626 2627 if (peer->tpk_in_progress) { 2628 wpa_printf(MSG_DEBUG, "TDLS: Setup is already in progress with the peer"); 2629 return 0; 2630 } 2631 2632 peer->initiator = 1; 2633 2634 /* add the peer to the driver as a "setup in progress" peer */ 2635 if (wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL, 2636 NULL, 0, 0, NULL, 0, NULL, 0, NULL, 0)) { 2637 wpa_tdls_disable_peer_link(sm, peer); 2638 return -1; 2639 } 2640 2641 peer->tpk_in_progress = 1; 2642 2643 if (wpa_tdls_send_tpk_m1(sm, peer) < 0) { 2644 wpa_tdls_disable_peer_link(sm, peer); 2645 return -1; 2646 } 2647 2648 return 0; 2649} 2650 2651 2652void wpa_tdls_remove(struct wpa_sm *sm, const u8 *addr) 2653{ 2654 struct wpa_tdls_peer *peer; 2655 2656 if (sm->tdls_disabled || !sm->tdls_supported) 2657 return; 2658 2659 for (peer = sm->tdls; peer; peer = peer->next) { 2660 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 2661 break; 2662 } 2663 2664 if (peer == NULL || !peer->tpk_success) 2665 return; 2666 2667 if (sm->tdls_external_setup) { 2668 /* 2669 * Disable previous link to allow renegotiation to be completed 2670 * on AP path. 2671 */ 2672 wpa_tdls_do_teardown(sm, peer, 2673 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED); 2674 } 2675} 2676 2677 2678/** 2679 * wpa_supplicant_rx_tdls - Receive TDLS data frame 2680 * 2681 * This function is called to receive TDLS (ethertype = 0x890d) data frames. 2682 */ 2683static void wpa_supplicant_rx_tdls(void *ctx, const u8 *src_addr, 2684 const u8 *buf, size_t len) 2685{ 2686 struct wpa_sm *sm = ctx; 2687 struct wpa_tdls_frame *tf; 2688 2689 wpa_hexdump(MSG_DEBUG, "TDLS: Received Data frame encapsulation", 2690 buf, len); 2691 2692 if (sm->tdls_disabled || !sm->tdls_supported) { 2693 wpa_printf(MSG_DEBUG, "TDLS: Discard message - TDLS disabled " 2694 "or unsupported by driver"); 2695 return; 2696 } 2697 2698 if (os_memcmp(src_addr, sm->own_addr, ETH_ALEN) == 0) { 2699 wpa_printf(MSG_DEBUG, "TDLS: Discard copy of own message"); 2700 return; 2701 } 2702 2703 if (len < sizeof(*tf)) { 2704 wpa_printf(MSG_INFO, "TDLS: Drop too short frame"); 2705 return; 2706 } 2707 2708 /* Check to make sure its a valid encapsulated TDLS frame */ 2709 tf = (struct wpa_tdls_frame *) buf; 2710 if (tf->payloadtype != 2 /* TDLS_RFTYPE */ || 2711 tf->category != WLAN_ACTION_TDLS) { 2712 wpa_printf(MSG_INFO, "TDLS: Invalid frame - payloadtype=%u " 2713 "category=%u action=%u", 2714 tf->payloadtype, tf->category, tf->action); 2715 return; 2716 } 2717 2718 switch (tf->action) { 2719 case WLAN_TDLS_SETUP_REQUEST: 2720 wpa_tdls_process_tpk_m1(sm, src_addr, buf, len); 2721 break; 2722 case WLAN_TDLS_SETUP_RESPONSE: 2723 wpa_tdls_process_tpk_m2(sm, src_addr, buf, len); 2724 break; 2725 case WLAN_TDLS_SETUP_CONFIRM: 2726 wpa_tdls_process_tpk_m3(sm, src_addr, buf, len); 2727 break; 2728 case WLAN_TDLS_TEARDOWN: 2729 wpa_tdls_recv_teardown(sm, src_addr, buf, len); 2730 break; 2731 case WLAN_TDLS_DISCOVERY_REQUEST: 2732 wpa_tdls_process_discovery_request(sm, src_addr, buf, len); 2733 break; 2734 default: 2735 /* Kernel code will process remaining frames */ 2736 wpa_printf(MSG_DEBUG, "TDLS: Ignore TDLS frame action code %u", 2737 tf->action); 2738 break; 2739 } 2740} 2741 2742 2743/** 2744 * wpa_tdls_init - Initialize driver interface parameters for TDLS 2745 * @wpa_s: Pointer to wpa_supplicant data 2746 * Returns: 0 on success, -1 on failure 2747 * 2748 * This function is called to initialize driver interface parameters for TDLS. 2749 * wpa_drv_init() must have been called before this function to initialize the 2750 * driver interface. 2751 */ 2752int wpa_tdls_init(struct wpa_sm *sm) 2753{ 2754 if (sm == NULL) 2755 return -1; 2756 2757 sm->l2_tdls = l2_packet_init(sm->bridge_ifname ? sm->bridge_ifname : 2758 sm->ifname, 2759 sm->own_addr, 2760 ETH_P_80211_ENCAP, wpa_supplicant_rx_tdls, 2761 sm, 0); 2762 if (sm->l2_tdls == NULL) { 2763 wpa_printf(MSG_ERROR, "TDLS: Failed to open l2_packet " 2764 "connection"); 2765 return -1; 2766 } 2767 2768 /* 2769 * Drivers that support TDLS but don't implement the get_capa callback 2770 * are assumed to perform everything internally 2771 */ 2772 if (wpa_sm_tdls_get_capa(sm, &sm->tdls_supported, 2773 &sm->tdls_external_setup, 2774 &sm->tdls_chan_switch) < 0) { 2775 sm->tdls_supported = 1; 2776 sm->tdls_external_setup = 0; 2777 } 2778 2779 wpa_printf(MSG_DEBUG, "TDLS: TDLS operation%s supported by " 2780 "driver", sm->tdls_supported ? "" : " not"); 2781 wpa_printf(MSG_DEBUG, "TDLS: Driver uses %s link setup", 2782 sm->tdls_external_setup ? "external" : "internal"); 2783 wpa_printf(MSG_DEBUG, "TDLS: Driver %s TDLS channel switching", 2784 sm->tdls_chan_switch ? "supports" : "does not support"); 2785 2786 return 0; 2787} 2788 2789 2790void wpa_tdls_teardown_peers(struct wpa_sm *sm) 2791{ 2792 struct wpa_tdls_peer *peer, *tmp; 2793 2794 if (!sm) 2795 return; 2796 peer = sm->tdls; 2797 2798 wpa_printf(MSG_DEBUG, "TDLS: Tear down peers"); 2799 2800 while (peer) { 2801 tmp = peer->next; 2802 wpa_printf(MSG_DEBUG, "TDLS: Tear down peer " MACSTR, 2803 MAC2STR(peer->addr)); 2804 if (sm->tdls_external_setup) 2805 wpa_tdls_do_teardown(sm, peer, 2806 WLAN_REASON_DEAUTH_LEAVING); 2807 else 2808 wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr); 2809 2810 peer = tmp; 2811 } 2812} 2813 2814 2815static void wpa_tdls_remove_peers(struct wpa_sm *sm) 2816{ 2817 struct wpa_tdls_peer *peer, *tmp; 2818 2819 peer = sm->tdls; 2820 2821 while (peer) { 2822 int res; 2823 tmp = peer->next; 2824 res = wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); 2825 wpa_printf(MSG_DEBUG, "TDLS: Remove peer " MACSTR " (res=%d)", 2826 MAC2STR(peer->addr), res); 2827 wpa_tdls_peer_free(sm, peer); 2828 peer = tmp; 2829 } 2830} 2831 2832 2833/** 2834 * wpa_tdls_deinit - Deinitialize driver interface parameters for TDLS 2835 * 2836 * This function is called to recover driver interface parameters for TDLS 2837 * and frees resources allocated for it. 2838 */ 2839void wpa_tdls_deinit(struct wpa_sm *sm) 2840{ 2841 if (sm == NULL) 2842 return; 2843 2844 if (sm->l2_tdls) 2845 l2_packet_deinit(sm->l2_tdls); 2846 sm->l2_tdls = NULL; 2847 2848 wpa_tdls_remove_peers(sm); 2849} 2850 2851 2852void wpa_tdls_assoc(struct wpa_sm *sm) 2853{ 2854 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on association"); 2855 wpa_tdls_remove_peers(sm); 2856} 2857 2858 2859void wpa_tdls_disassoc(struct wpa_sm *sm) 2860{ 2861 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on disassociation"); 2862 wpa_tdls_remove_peers(sm); 2863} 2864 2865 2866static int wpa_tdls_prohibited(struct wpa_eapol_ie_parse *elems) 2867{ 2868 /* bit 38 - TDLS Prohibited */ 2869 return !!(elems->ext_capab[2 + 4] & 0x40); 2870} 2871 2872 2873static int wpa_tdls_chan_switch_prohibited(struct wpa_eapol_ie_parse *elems) 2874{ 2875 /* bit 39 - TDLS Channel Switch Prohibited */ 2876 return !!(elems->ext_capab[2 + 4] & 0x80); 2877} 2878 2879 2880void wpa_tdls_ap_ies(struct wpa_sm *sm, const u8 *ies, size_t len) 2881{ 2882 struct wpa_eapol_ie_parse elems; 2883 2884 sm->tdls_prohibited = 0; 2885 sm->tdls_chan_switch_prohibited = 0; 2886 2887 if (ies == NULL || wpa_supplicant_parse_ies(ies, len, &elems) < 0 || 2888 elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5) 2889 return; 2890 2891 sm->tdls_prohibited = wpa_tdls_prohibited(&elems); 2892 wpa_printf(MSG_DEBUG, "TDLS: TDLS is %s in the target BSS", 2893 sm->tdls_prohibited ? "prohibited" : "allowed"); 2894 sm->tdls_chan_switch_prohibited = 2895 wpa_tdls_chan_switch_prohibited(&elems); 2896 wpa_printf(MSG_DEBUG, "TDLS: TDLS channel switch %s in the target BSS", 2897 sm->tdls_chan_switch_prohibited ? "prohibited" : "allowed"); 2898} 2899 2900 2901void wpa_tdls_assoc_resp_ies(struct wpa_sm *sm, const u8 *ies, size_t len) 2902{ 2903 struct wpa_eapol_ie_parse elems; 2904 2905 if (ies == NULL || wpa_supplicant_parse_ies(ies, len, &elems) < 0 || 2906 elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5) 2907 return; 2908 2909 if (!sm->tdls_prohibited && wpa_tdls_prohibited(&elems)) { 2910 wpa_printf(MSG_DEBUG, "TDLS: TDLS prohibited based on " 2911 "(Re)Association Response IEs"); 2912 sm->tdls_prohibited = 1; 2913 } 2914 2915 if (!sm->tdls_chan_switch_prohibited && 2916 wpa_tdls_chan_switch_prohibited(&elems)) { 2917 wpa_printf(MSG_DEBUG, 2918 "TDLS: TDLS channel switch prohibited based on (Re)Association Response IEs"); 2919 sm->tdls_chan_switch_prohibited = 1; 2920 } 2921} 2922 2923 2924void wpa_tdls_enable(struct wpa_sm *sm, int enabled) 2925{ 2926 wpa_printf(MSG_DEBUG, "TDLS: %s", enabled ? "enabled" : "disabled"); 2927 sm->tdls_disabled = !enabled; 2928} 2929 2930 2931int wpa_tdls_is_external_setup(struct wpa_sm *sm) 2932{ 2933 return sm->tdls_external_setup; 2934} 2935 2936 2937int wpa_tdls_enable_chan_switch(struct wpa_sm *sm, const u8 *addr, 2938 u8 oper_class, 2939 struct hostapd_freq_params *freq_params) 2940{ 2941 struct wpa_tdls_peer *peer; 2942 int ret; 2943 2944 if (sm->tdls_disabled || !sm->tdls_supported) 2945 return -1; 2946 2947 if (!sm->tdls_chan_switch) { 2948 wpa_printf(MSG_DEBUG, 2949 "TDLS: Channel switching not supported by the driver"); 2950 return -1; 2951 } 2952 2953 if (sm->tdls_chan_switch_prohibited) { 2954 wpa_printf(MSG_DEBUG, 2955 "TDLS: Channel switching is prohibited in this BSS - reject request to switch channel"); 2956 return -1; 2957 } 2958 2959 for (peer = sm->tdls; peer; peer = peer->next) { 2960 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 2961 break; 2962 } 2963 2964 if (peer == NULL || !peer->tpk_success) { 2965 wpa_printf(MSG_ERROR, "TDLS: Peer " MACSTR 2966 " not found for channel switching", MAC2STR(addr)); 2967 return -1; 2968 } 2969 2970 if (peer->chan_switch_enabled) { 2971 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR 2972 " already has channel switching enabled", 2973 MAC2STR(addr)); 2974 return 0; 2975 } 2976 2977 ret = wpa_sm_tdls_enable_channel_switch(sm, peer->addr, 2978 oper_class, freq_params); 2979 if (!ret) 2980 peer->chan_switch_enabled = 1; 2981 2982 return ret; 2983} 2984 2985 2986int wpa_tdls_disable_chan_switch(struct wpa_sm *sm, const u8 *addr) 2987{ 2988 struct wpa_tdls_peer *peer; 2989 2990 if (sm->tdls_disabled || !sm->tdls_supported) 2991 return -1; 2992 2993 for (peer = sm->tdls; peer; peer = peer->next) { 2994 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) 2995 break; 2996 } 2997 2998 if (!peer || !peer->chan_switch_enabled) { 2999 wpa_printf(MSG_ERROR, "TDLS: Channel switching not enabled for " 3000 MACSTR, MAC2STR(addr)); 3001 return -1; 3002 } 3003 3004 /* ignore the return value */ 3005 wpa_sm_tdls_disable_channel_switch(sm, peer->addr); 3006 3007 peer->chan_switch_enabled = 0; 3008 return 0; 3009} 3010