src/rsn_supp/tdls.c

   1 /*
   2  * wpa_supplicant - TDLS
   3  * Copyright (c) 2010-2011, Atheros Communications
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "utils/os.h"
  14 #include "common/ieee802_11_defs.h"
  15 #include "crypto/sha256.h"
  16 #include "crypto/crypto.h"
  17 #include "crypto/aes_wrap.h"
  18 #include "rsn_supp/wpa.h"
  19 #include "rsn_supp/wpa_ie.h"
  20 #include "rsn_supp/wpa_i.h"
  21 #include "drivers/driver.h"
  22 #include "l2_packet/l2_packet.h"
  23
  24 #ifdef CONFIG_TDLS_TESTING
  25 #define TDLS_TESTING_LONG_FRAME BIT(0)
  26 #define TDLS_TESTING_ALT_RSN_IE BIT(1)
  27 #define TDLS_TESTING_DIFF_BSSID BIT(2)
  28 #define TDLS_TESTING_SHORT_LIFETIME BIT(3)
  29 #define TDLS_TESTING_WRONG_LIFETIME_RESP BIT(4)
  30 #define TDLS_TESTING_WRONG_LIFETIME_CONF BIT(5)
  31 #define TDLS_TESTING_LONG_LIFETIME BIT(6)
  32 #define TDLS_TESTING_CONCURRENT_INIT BIT(7)
  33 #define TDLS_TESTING_NO_TPK_EXPIRATION BIT(8)
  34 #define TDLS_TESTING_DECLINE_RESP BIT(9)
  35 #define TDLS_TESTING_IGNORE_AP_PROHIBIT BIT(10)
  36 unsigned int tdls_testing = 0;
  37 #endif /* CONFIG_TDLS_TESTING */
  38
  39 #define TPK_LIFETIME 43200 /* 12 hours */
  40 #define TPK_M1_RETRY_COUNT 3
  41 #define TPK_M1_TIMEOUT 5000 /* in milliseconds */
  42 #define TPK_M2_RETRY_COUNT 10
  43 #define TPK_M2_TIMEOUT 500 /* in milliseconds */
  44
  45 #define TDLS_MIC_LEN            16
  46
  47 #define TDLS_TIMEOUT_LEN        4
  48
  49 struct wpa_tdls_ftie {
  50         u8 ie_type; /* FTIE */
  51         u8 ie_len;
  52         u8 mic_ctrl[2];
  53         u8 mic[TDLS_MIC_LEN];
  54         u8 Anonce[WPA_NONCE_LEN]; /* Responder Nonce in TDLS */
  55         u8 Snonce[WPA_NONCE_LEN]; /* Initiator Nonce in TDLS */
  56         /* followed by optional elements */
  57 } STRUCT_PACKED;
  58
  59 struct wpa_tdls_timeoutie {
  60         u8 ie_type; /* Timeout IE */
  61         u8 ie_len;
  62         u8 interval_type;
  63         u8 value[TDLS_TIMEOUT_LEN];
  64 } STRUCT_PACKED;
  65
  66 struct wpa_tdls_lnkid {
  67         u8 ie_type; /* Link Identifier IE */
  68         u8 ie_len;
  69         u8 bssid[ETH_ALEN];
  70         u8 init_sta[ETH_ALEN];
  71         u8 resp_sta[ETH_ALEN];
  72 } STRUCT_PACKED;
  73
  74 /* TDLS frame headers as per IEEE Std 802.11z-2010 */
  75 struct wpa_tdls_frame {
  76         u8 payloadtype; /* IEEE80211_TDLS_RFTYPE */
  77         u8 category; /* Category */
  78         u8 action; /* Action (enum tdls_frame_type) */
  79 } STRUCT_PACKED;
  80
  81 static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs);
  82 static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx);
  83 static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer);
  84
  85
  86 #define TDLS_MAX_IE_LEN 80
  87 #define IEEE80211_MAX_SUPP_RATES 32
  88
  89 struct 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
 139 static 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
 150 static 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
 157 static 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
 170 static 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
 203 static 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
 212 static 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
 278 static 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
 299 static 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
 346 static 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
 372 static 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  */
 437 static 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  */
 499 static 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
 546 static 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
 575 static 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
 598 static 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
 624 static 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
 649 static 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
 665 int 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
 738 skip_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
 754 int 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
 782 void 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
 798 static 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
 862 skip_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
 884 static 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
 895 static struct wpa_tdls_peer *
 896 wpa_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
 925 static 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
1004 skip_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
1078 skip_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
1103 static 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
1177 skip_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
1186 static 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
1258 skip_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
1267 static 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
1279 static int
1280 wpa_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
1328 int 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
1340 static 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
1355 static 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
1383 static 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
1411 static 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
1435 static 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
1657 skip_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
1743 skip_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
1756 error:
1757         wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken,
1758                             status);
1759         return -1;
1760 }
1761
1762
1763 static 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
1807 static 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
2027 skip_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
2042 error:
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
2051 static 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
2184 skip_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
2195 static 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  */
2218 int 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
2260 void 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  */
2290 static 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  */
2359 int 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
2394 void 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
2416 static 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  */
2442 void 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
2455 void 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
2462 void 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
2469 static 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
2487 void 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
2495 void 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
2505 void 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
2512 int wpa_tdls_is_external_setup(struct wpa_sm *sm)
2513 {
2514         return sm->tdls_external_setup;
2515 }