/* * wpa_supplicant - TDLS * Copyright (c) 2010-2011, Atheros Communications * * This software may be distributed under the terms of the BSD license. * See README for more details. */ #include "utils/includes.h" #include "utils/common.h" #include "utils/eloop.h" #include "utils/os.h" #include "common/ieee802_11_defs.h" #include "crypto/sha256.h" #include "crypto/crypto.h" #include "crypto/aes_wrap.h" #include "rsn_supp/wpa.h" #include "rsn_supp/wpa_ie.h" #include "rsn_supp/wpa_i.h" #include "drivers/driver.h" #include "l2_packet/l2_packet.h" #ifdef CONFIG_TDLS_TESTING #define TDLS_TESTING_LONG_FRAME BIT(0) #define TDLS_TESTING_ALT_RSN_IE BIT(1) #define TDLS_TESTING_DIFF_BSSID BIT(2) #define TDLS_TESTING_SHORT_LIFETIME BIT(3) #define TDLS_TESTING_WRONG_LIFETIME_RESP BIT(4) #define TDLS_TESTING_WRONG_LIFETIME_CONF BIT(5) #define TDLS_TESTING_LONG_LIFETIME BIT(6) #define TDLS_TESTING_CONCURRENT_INIT BIT(7) #define TDLS_TESTING_NO_TPK_EXPIRATION BIT(8) #define TDLS_TESTING_DECLINE_RESP BIT(9) #define TDLS_TESTING_IGNORE_AP_PROHIBIT BIT(10) #define TDLS_TESTING_WRONG_MIC BIT(11) unsigned int tdls_testing = 0; #endif /* CONFIG_TDLS_TESTING */ #define TPK_LIFETIME 43200 /* 12 hours */ #define TPK_M1_RETRY_COUNT 3 #define TPK_M1_TIMEOUT 5000 /* in milliseconds */ #define TPK_M2_RETRY_COUNT 10 #define TPK_M2_TIMEOUT 500 /* in milliseconds */ #define TDLS_MIC_LEN 16 #define TDLS_TIMEOUT_LEN 4 struct wpa_tdls_ftie { u8 ie_type; /* FTIE */ u8 ie_len; u8 mic_ctrl[2]; u8 mic[TDLS_MIC_LEN]; u8 Anonce[WPA_NONCE_LEN]; /* Responder Nonce in TDLS */ u8 Snonce[WPA_NONCE_LEN]; /* Initiator Nonce in TDLS */ /* followed by optional elements */ } STRUCT_PACKED; struct wpa_tdls_timeoutie { u8 ie_type; /* Timeout IE */ u8 ie_len; u8 interval_type; u8 value[TDLS_TIMEOUT_LEN]; } STRUCT_PACKED; struct wpa_tdls_lnkid { u8 ie_type; /* Link Identifier IE */ u8 ie_len; u8 bssid[ETH_ALEN]; u8 init_sta[ETH_ALEN]; u8 resp_sta[ETH_ALEN]; } STRUCT_PACKED; /* TDLS frame headers as per IEEE Std 802.11z-2010 */ struct wpa_tdls_frame { u8 payloadtype; /* IEEE80211_TDLS_RFTYPE */ u8 category; /* Category */ u8 action; /* Action (enum tdls_frame_type) */ } STRUCT_PACKED; static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs); static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx); static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer); static void wpa_tdls_disable_peer_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer); static int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr, u16 reason_code); #define TDLS_MAX_IE_LEN 80 #define IEEE80211_MAX_SUPP_RATES 32 struct wpa_tdls_peer { struct wpa_tdls_peer *next; unsigned int reconfig_key:1; int initiator; /* whether this end was initiator for TDLS setup */ u8 addr[ETH_ALEN]; /* other end MAC address */ u8 inonce[WPA_NONCE_LEN]; /* Initiator Nonce */ u8 rnonce[WPA_NONCE_LEN]; /* Responder Nonce */ u8 rsnie_i[TDLS_MAX_IE_LEN]; /* Initiator RSN IE */ size_t rsnie_i_len; u8 rsnie_p[TDLS_MAX_IE_LEN]; /* Peer RSN IE */ size_t rsnie_p_len; u32 lifetime; int cipher; /* Selected cipher (WPA_CIPHER_*) */ u8 dtoken; struct tpk { u8 kck[16]; /* TPK-KCK */ u8 tk[16]; /* TPK-TK; assuming only CCMP will be used */ } tpk; int tpk_set; int tpk_success; int tpk_in_progress; struct tpk_timer { u8 dest[ETH_ALEN]; int count; /* Retry Count */ int timer; /* Timeout in milliseconds */ u8 action_code; /* TDLS frame type */ u8 dialog_token; u16 status_code; u32 peer_capab; int buf_len; /* length of TPK message for retransmission */ u8 *buf; /* buffer for TPK message */ } sm_tmr; u16 capability; u8 supp_rates[IEEE80211_MAX_SUPP_RATES]; size_t supp_rates_len; struct ieee80211_ht_capabilities *ht_capabilities; struct ieee80211_vht_capabilities *vht_capabilities; u8 qos_info; u16 aid; u8 *ext_capab; size_t ext_capab_len; u8 *supp_channels; size_t supp_channels_len; u8 *supp_oper_classes; size_t supp_oper_classes_len; u8 wmm_capable; }; static int wpa_tdls_get_privacy(struct wpa_sm *sm) { /* * Get info needed from supplicant to check if the current BSS supports * security. Other than OPEN mode, rest are considered secured * WEP/WPA/WPA2 hence TDLS frames are processed for TPK handshake. */ return sm->pairwise_cipher != WPA_CIPHER_NONE; } static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len) { os_memcpy(pos, ie, ie_len); return pos + ie_len; } static int wpa_tdls_del_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer) { if (wpa_sm_set_key(sm, WPA_ALG_NONE, peer->addr, 0, 0, NULL, 0, NULL, 0) < 0) { wpa_printf(MSG_WARNING, "TDLS: Failed to delete TPK-TK from " "the driver"); return -1; } return 0; } static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer) { u8 key_len; u8 rsc[6]; enum wpa_alg alg; os_memset(rsc, 0, 6); switch (peer->cipher) { case WPA_CIPHER_CCMP: alg = WPA_ALG_CCMP; key_len = 16; break; case WPA_CIPHER_NONE: wpa_printf(MSG_DEBUG, "TDLS: Pairwise Cipher Suite: " "NONE - do not use pairwise keys"); return -1; default: wpa_printf(MSG_WARNING, "TDLS: Unsupported pairwise cipher %d", sm->pairwise_cipher); return -1; } if (wpa_sm_set_key(sm, alg, peer->addr, -1, 1, rsc, sizeof(rsc), peer->tpk.tk, key_len) < 0) { wpa_printf(MSG_WARNING, "TDLS: Failed to set TPK to the " "driver"); return -1; } return 0; } static int wpa_tdls_send_tpk_msg(struct wpa_sm *sm, const u8 *dst, u8 action_code, u8 dialog_token, u16 status_code, u32 peer_capab, const u8 *buf, size_t len) { return wpa_sm_send_tdls_mgmt(sm, dst, action_code, dialog_token, status_code, peer_capab, buf, len); } static int wpa_tdls_tpk_send(struct wpa_sm *sm, const u8 *dest, u8 action_code, u8 dialog_token, u16 status_code, u32 peer_capab, const u8 *msg, size_t msg_len) { struct wpa_tdls_peer *peer; wpa_printf(MSG_DEBUG, "TDLS: TPK send dest=" MACSTR " action_code=%u " "dialog_token=%u status_code=%u peer_capab=%u msg_len=%u", MAC2STR(dest), action_code, dialog_token, status_code, peer_capab, (unsigned int) msg_len); if (wpa_tdls_send_tpk_msg(sm, dest, action_code, dialog_token, status_code, peer_capab, msg, msg_len)) { wpa_printf(MSG_INFO, "TDLS: Failed to send message " "(action_code=%u)", action_code); return -1; } if (action_code == WLAN_TDLS_SETUP_CONFIRM || action_code == WLAN_TDLS_TEARDOWN || action_code == WLAN_TDLS_DISCOVERY_REQUEST || action_code == WLAN_TDLS_DISCOVERY_RESPONSE) return 0; /* No retries */ for (peer = sm->tdls; peer; peer = peer->next) { if (os_memcmp(peer->addr, dest, ETH_ALEN) == 0) break; } if (peer == NULL) { wpa_printf(MSG_INFO, "TDLS: No matching entry found for " "retry " MACSTR, MAC2STR(dest)); return 0; } eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); if (action_code == WLAN_TDLS_SETUP_RESPONSE) { peer->sm_tmr.count = TPK_M2_RETRY_COUNT; peer->sm_tmr.timer = TPK_M2_TIMEOUT; } else { peer->sm_tmr.count = TPK_M1_RETRY_COUNT; peer->sm_tmr.timer = TPK_M1_TIMEOUT; } /* Copy message to resend on timeout */ os_memcpy(peer->sm_tmr.dest, dest, ETH_ALEN); peer->sm_tmr.action_code = action_code; peer->sm_tmr.dialog_token = dialog_token; peer->sm_tmr.status_code = status_code; peer->sm_tmr.peer_capab = peer_capab; peer->sm_tmr.buf_len = msg_len; os_free(peer->sm_tmr.buf); peer->sm_tmr.buf = os_malloc(msg_len); if (peer->sm_tmr.buf == NULL) return -1; os_memcpy(peer->sm_tmr.buf, msg, msg_len); wpa_printf(MSG_DEBUG, "TDLS: Retry timeout registered " "(action_code=%u)", action_code); eloop_register_timeout(peer->sm_tmr.timer / 1000, (peer->sm_tmr.timer % 1000) * 1000, wpa_tdls_tpk_retry_timeout, sm, peer); return 0; } static int wpa_tdls_do_teardown(struct wpa_sm *sm, struct wpa_tdls_peer *peer, u16 reason_code) { int ret; ret = wpa_tdls_send_teardown(sm, peer->addr, reason_code); /* disable the link after teardown was sent */ wpa_tdls_disable_peer_link(sm, peer); return ret; } static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx) { struct wpa_sm *sm = eloop_ctx; struct wpa_tdls_peer *peer = timeout_ctx; if (peer->sm_tmr.count) { peer->sm_tmr.count--; wpa_printf(MSG_INFO, "TDLS: Retrying sending of message " "(action_code=%u)", peer->sm_tmr.action_code); if (peer->sm_tmr.buf == NULL) { wpa_printf(MSG_INFO, "TDLS: No retry buffer available " "for action_code=%u", peer->sm_tmr.action_code); eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); return; } /* resend TPK Handshake Message to Peer */ if (wpa_tdls_send_tpk_msg(sm, peer->sm_tmr.dest, peer->sm_tmr.action_code, peer->sm_tmr.dialog_token, peer->sm_tmr.status_code, peer->sm_tmr.peer_capab, peer->sm_tmr.buf, peer->sm_tmr.buf_len)) { wpa_printf(MSG_INFO, "TDLS: Failed to retry " "transmission"); } eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); eloop_register_timeout(peer->sm_tmr.timer / 1000, (peer->sm_tmr.timer % 1000) * 1000, wpa_tdls_tpk_retry_timeout, sm, peer); } else { eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); wpa_printf(MSG_DEBUG, "TDLS: Sending Teardown Request"); wpa_tdls_do_teardown(sm, peer, WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED); } } static void wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm *sm, struct wpa_tdls_peer *peer, u8 action_code) { if (action_code == peer->sm_tmr.action_code) { wpa_printf(MSG_DEBUG, "TDLS: Retry timeout cancelled for " "action_code=%u", action_code); /* Cancel Timeout registered */ eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); /* free all resources meant for retry */ os_free(peer->sm_tmr.buf); peer->sm_tmr.buf = NULL; peer->sm_tmr.count = 0; peer->sm_tmr.timer = 0; peer->sm_tmr.buf_len = 0; peer->sm_tmr.action_code = 0xff; } else { wpa_printf(MSG_INFO, "TDLS: Error in cancelling retry timeout " "(Unknown action_code=%u)", action_code); } } static void wpa_tdls_generate_tpk(struct wpa_tdls_peer *peer, const u8 *own_addr, const u8 *bssid) { u8 key_input[SHA256_MAC_LEN]; const u8 *nonce[2]; size_t len[2]; u8 data[3 * ETH_ALEN]; /* IEEE Std 802.11z-2010 8.5.9.1: * TPK-Key-Input = SHA-256(min(SNonce, ANonce) || max(SNonce, ANonce)) */ len[0] = WPA_NONCE_LEN; len[1] = WPA_NONCE_LEN; if (os_memcmp(peer->inonce, peer->rnonce, WPA_NONCE_LEN) < 0) { nonce[0] = peer->inonce; nonce[1] = peer->rnonce; } else { nonce[0] = peer->rnonce; nonce[1] = peer->inonce; } wpa_hexdump(MSG_DEBUG, "TDLS: min(Nonce)", nonce[0], WPA_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "TDLS: max(Nonce)", nonce[1], WPA_NONCE_LEN); sha256_vector(2, nonce, len, key_input); wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-Key-Input", key_input, SHA256_MAC_LEN); /* * TPK-Key-Data = KDF-N_KEY(TPK-Key-Input, "TDLS PMK", * min(MAC_I, MAC_R) || max(MAC_I, MAC_R) || BSSID || N_KEY) * TODO: is N_KEY really included in KDF Context and if so, in which * presentation format (little endian 16-bit?) is it used? It gets * added by the KDF anyway.. */ if (os_memcmp(own_addr, peer->addr, ETH_ALEN) < 0) { os_memcpy(data, own_addr, ETH_ALEN); os_memcpy(data + ETH_ALEN, peer->addr, ETH_ALEN); } else { os_memcpy(data, peer->addr, ETH_ALEN); os_memcpy(data + ETH_ALEN, own_addr, ETH_ALEN); } os_memcpy(data + 2 * ETH_ALEN, bssid, ETH_ALEN); wpa_hexdump(MSG_DEBUG, "TDLS: KDF Context", data, sizeof(data)); sha256_prf(key_input, SHA256_MAC_LEN, "TDLS PMK", data, sizeof(data), (u8 *) &peer->tpk, sizeof(peer->tpk)); wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-KCK", peer->tpk.kck, sizeof(peer->tpk.kck)); wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-TK", peer->tpk.tk, sizeof(peer->tpk.tk)); peer->tpk_set = 1; } /** * wpa_tdls_ftie_mic - Calculate TDLS FTIE MIC * @kck: TPK-KCK * @lnkid: Pointer to the beginning of Link Identifier IE * @rsnie: Pointer to the beginning of RSN IE used for handshake * @timeoutie: Pointer to the beginning of Timeout IE used for handshake * @ftie: Pointer to the beginning of FT IE * @mic: Pointer for writing MIC * * Calculate MIC for TDLS frame. */ static int wpa_tdls_ftie_mic(const u8 *kck, u8 trans_seq, const u8 *lnkid, const u8 *rsnie, const u8 *timeoutie, const u8 *ftie, u8 *mic) { u8 *buf, *pos; struct wpa_tdls_ftie *_ftie; const struct wpa_tdls_lnkid *_lnkid; int ret; int len = 2 * ETH_ALEN + 1 + 2 + lnkid[1] + 2 + rsnie[1] + 2 + timeoutie[1] + 2 + ftie[1]; buf = os_zalloc(len); if (!buf) { wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation"); return -1; } pos = buf; _lnkid = (const struct wpa_tdls_lnkid *) lnkid; /* 1) TDLS initiator STA MAC address */ os_memcpy(pos, _lnkid->init_sta, ETH_ALEN); pos += ETH_ALEN; /* 2) TDLS responder STA MAC address */ os_memcpy(pos, _lnkid->resp_sta, ETH_ALEN); pos += ETH_ALEN; /* 3) Transaction Sequence number */ *pos++ = trans_seq; /* 4) Link Identifier IE */ os_memcpy(pos, lnkid, 2 + lnkid[1]); pos += 2 + lnkid[1]; /* 5) RSN IE */ os_memcpy(pos, rsnie, 2 + rsnie[1]); pos += 2 + rsnie[1]; /* 6) Timeout Interval IE */ os_memcpy(pos, timeoutie, 2 + timeoutie[1]); pos += 2 + timeoutie[1]; /* 7) FTIE, with the MIC field of the FTIE set to 0 */ os_memcpy(pos, ftie, 2 + ftie[1]); _ftie = (struct wpa_tdls_ftie *) pos; os_memset(_ftie->mic, 0, TDLS_MIC_LEN); pos += 2 + ftie[1]; wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf); wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16); ret = omac1_aes_128(kck, buf, pos - buf, mic); os_free(buf); wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16); return ret; } /** * wpa_tdls_key_mic_teardown - Calculate TDLS FTIE MIC for Teardown frame * @kck: TPK-KCK * @trans_seq: Transaction Sequence Number (4 - Teardown) * @rcode: Reason code for Teardown * @dtoken: Dialog Token used for that particular link * @lnkid: Pointer to the beginning of Link Identifier IE * @ftie: Pointer to the beginning of FT IE * @mic: Pointer for writing MIC * * Calculate MIC for TDLS frame. */ static int wpa_tdls_key_mic_teardown(const u8 *kck, u8 trans_seq, u16 rcode, u8 dtoken, const u8 *lnkid, const u8 *ftie, u8 *mic) { u8 *buf, *pos; struct wpa_tdls_ftie *_ftie; int ret; int len; if (lnkid == NULL) return -1; len = 2 + lnkid[1] + sizeof(rcode) + sizeof(dtoken) + sizeof(trans_seq) + 2 + ftie[1]; buf = os_zalloc(len); if (!buf) { wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation"); return -1; } pos = buf; /* 1) Link Identifier IE */ os_memcpy(pos, lnkid, 2 + lnkid[1]); pos += 2 + lnkid[1]; /* 2) Reason Code */ WPA_PUT_LE16(pos, rcode); pos += sizeof(rcode); /* 3) Dialog token */ *pos++ = dtoken; /* 4) Transaction Sequence number */ *pos++ = trans_seq; /* 7) FTIE, with the MIC field of the FTIE set to 0 */ os_memcpy(pos, ftie, 2 + ftie[1]); _ftie = (struct wpa_tdls_ftie *) pos; os_memset(_ftie->mic, 0, TDLS_MIC_LEN); pos += 2 + ftie[1]; wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf); wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16); ret = omac1_aes_128(kck, buf, pos - buf, mic); os_free(buf); wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16); return ret; } static int wpa_supplicant_verify_tdls_mic(u8 trans_seq, struct wpa_tdls_peer *peer, const u8 *lnkid, const u8 *timeoutie, const struct wpa_tdls_ftie *ftie) { u8 mic[16]; if (peer->tpk_set) { wpa_tdls_ftie_mic(peer->tpk.kck, trans_seq, lnkid, peer->rsnie_p, timeoutie, (u8 *) ftie, mic); if (os_memcmp_const(mic, ftie->mic, 16) != 0) { wpa_printf(MSG_INFO, "TDLS: Invalid MIC in FTIE - " "dropping packet"); wpa_hexdump(MSG_DEBUG, "TDLS: Received MIC", ftie->mic, 16); wpa_hexdump(MSG_DEBUG, "TDLS: Calculated MIC", mic, 16); return -1; } } else { wpa_printf(MSG_WARNING, "TDLS: Could not verify TDLS MIC, " "TPK not set - dropping packet"); return -1; } return 0; } static int wpa_supplicant_verify_tdls_mic_teardown( u8 trans_seq, u16 rcode, u8 dtoken, struct wpa_tdls_peer *peer, const u8 *lnkid, const struct wpa_tdls_ftie *ftie) { u8 mic[16]; if (peer->tpk_set) { wpa_tdls_key_mic_teardown(peer->tpk.kck, trans_seq, rcode, dtoken, lnkid, (u8 *) ftie, mic); if (os_memcmp_const(mic, ftie->mic, 16) != 0) { wpa_printf(MSG_INFO, "TDLS: Invalid MIC in Teardown - " "dropping packet"); return -1; } } else { wpa_printf(MSG_INFO, "TDLS: Could not verify TDLS Teardown " "MIC, TPK not set - dropping packet"); return -1; } return 0; } static void wpa_tdls_tpk_timeout(void *eloop_ctx, void *timeout_ctx) { struct wpa_sm *sm = eloop_ctx; struct wpa_tdls_peer *peer = timeout_ctx; /* * On TPK lifetime expiration, we have an option of either tearing down * the direct link or trying to re-initiate it. The selection of what * to do is not strictly speaking controlled by our role in the expired * link, but for now, use that to select whether to renew or tear down * the link. */ if (peer->initiator) { wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR " - try to renew", MAC2STR(peer->addr)); wpa_tdls_start(sm, peer->addr); } else { wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR " - tear down", MAC2STR(peer->addr)); wpa_tdls_do_teardown(sm, peer, WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED); } } static void wpa_tdls_peer_remove_from_list(struct wpa_sm *sm, struct wpa_tdls_peer *peer) { struct wpa_tdls_peer *cur, *prev; cur = sm->tdls; prev = NULL; while (cur && cur != peer) { prev = cur; cur = cur->next; } if (cur != peer) { wpa_printf(MSG_ERROR, "TDLS: Could not find peer " MACSTR " to remove it from the list", MAC2STR(peer->addr)); return; } if (prev) prev->next = peer->next; else sm->tdls = peer->next; } static void wpa_tdls_peer_clear(struct wpa_sm *sm, struct wpa_tdls_peer *peer) { wpa_printf(MSG_DEBUG, "TDLS: Clear state for peer " MACSTR, MAC2STR(peer->addr)); eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer); eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer); peer->reconfig_key = 0; peer->initiator = 0; peer->tpk_in_progress = 0; os_free(peer->sm_tmr.buf); peer->sm_tmr.buf = NULL; os_free(peer->ht_capabilities); peer->ht_capabilities = NULL; os_free(peer->vht_capabilities); peer->vht_capabilities = NULL; os_free(peer->ext_capab); peer->ext_capab = NULL; os_free(peer->supp_channels); peer->supp_channels = NULL; os_free(peer->supp_oper_classes); peer->supp_oper_classes = NULL; peer->rsnie_i_len = peer->rsnie_p_len = 0; peer->cipher = 0; peer->qos_info = 0; peer->wmm_capable = 0; peer->tpk_set = peer->tpk_success = 0; os_memset(&peer->tpk, 0, sizeof(peer->tpk)); os_memset(peer->inonce, 0, WPA_NONCE_LEN); os_memset(peer->rnonce, 0, WPA_NONCE_LEN); } static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer) { wpa_tdls_peer_clear(sm, peer); wpa_tdls_peer_remove_from_list(sm, peer); os_free(peer); } static void wpa_tdls_linkid(struct wpa_sm *sm, struct wpa_tdls_peer *peer, struct wpa_tdls_lnkid *lnkid) { lnkid->ie_type = WLAN_EID_LINK_ID; lnkid->ie_len = 3 * ETH_ALEN; os_memcpy(lnkid->bssid, sm->bssid, ETH_ALEN); if (peer->initiator) { os_memcpy(lnkid->init_sta, sm->own_addr, ETH_ALEN); os_memcpy(lnkid->resp_sta, peer->addr, ETH_ALEN); } else { os_memcpy(lnkid->init_sta, peer->addr, ETH_ALEN); os_memcpy(lnkid->resp_sta, sm->own_addr, ETH_ALEN); } } static int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr, u16 reason_code) { struct wpa_tdls_peer *peer; struct wpa_tdls_ftie *ftie; struct wpa_tdls_lnkid lnkid; u8 dialog_token; u8 *rbuf, *pos; int ielen; if (sm->tdls_disabled || !sm->tdls_supported) return -1; /* Find the node and free from the list */ for (peer = sm->tdls; peer; peer = peer->next) { if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) break; } if (peer == NULL) { wpa_printf(MSG_INFO, "TDLS: No matching entry found for " "Teardown " MACSTR, MAC2STR(addr)); return 0; } dialog_token = peer->dtoken; wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown for " MACSTR, MAC2STR(addr)); ielen = 0; if (wpa_tdls_get_privacy(sm) && peer->tpk_set && peer->tpk_success) { /* To add FTIE for Teardown request and compute MIC */ ielen += sizeof(*ftie); #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_LONG_FRAME) ielen += 170; #endif /* CONFIG_TDLS_TESTING */ } rbuf = os_zalloc(ielen + 1); if (rbuf == NULL) return -1; pos = rbuf; if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success) goto skip_ies; ftie = (struct wpa_tdls_ftie *) pos; ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; /* Using the recent nonce which should be for CONFIRM frame */ os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN); os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; pos = (u8 *) (ftie + 1); #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_LONG_FRAME) { wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " "FTIE"); ftie->ie_len += 170; *pos++ = 255; /* FTIE subelem */ *pos++ = 168; /* FTIE subelem length */ pos += 168; } #endif /* CONFIG_TDLS_TESTING */ wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TDLS Teardown handshake", (u8 *) ftie, pos - (u8 *) ftie); /* compute MIC before sending */ wpa_tdls_linkid(sm, peer, &lnkid); wpa_tdls_key_mic_teardown(peer->tpk.kck, 4, reason_code, dialog_token, (u8 *) &lnkid, (u8 *) ftie, ftie->mic); skip_ies: /* TODO: register for a Timeout handler, if Teardown is not received at * the other end, then try again another time */ /* request driver to send Teardown using this FTIE */ wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_TEARDOWN, 0, reason_code, 0, rbuf, pos - rbuf); os_free(rbuf); return 0; } int wpa_tdls_teardown_link(struct wpa_sm *sm, const u8 *addr, u16 reason_code) { struct wpa_tdls_peer *peer; if (sm->tdls_disabled || !sm->tdls_supported) return -1; for (peer = sm->tdls; peer; peer = peer->next) { if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) break; } if (peer == NULL) { wpa_printf(MSG_DEBUG, "TDLS: Could not find peer " MACSTR " for link Teardown", MAC2STR(addr)); return -1; } if (!peer->tpk_success) { wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR " not connected - cannot Teardown link", MAC2STR(addr)); return -1; } return wpa_tdls_do_teardown(sm, peer, reason_code); } static void wpa_tdls_disable_peer_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer) { wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); wpa_tdls_peer_free(sm, peer); } void wpa_tdls_disable_unreachable_link(struct wpa_sm *sm, const u8 *addr) { struct wpa_tdls_peer *peer; for (peer = sm->tdls; peer; peer = peer->next) { if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) break; } if (!peer || !peer->tpk_success) { wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR " not connected - cannot teardown unreachable link", MAC2STR(addr)); return; } if (wpa_tdls_is_external_setup(sm)) { /* * Disable the link, send a teardown packet through the * AP, and then reset link data. */ wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, addr); wpa_tdls_send_teardown(sm, addr, WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE); wpa_tdls_peer_free(sm, peer); } else { wpa_tdls_disable_peer_link(sm, peer); } } const char * wpa_tdls_get_link_status(struct wpa_sm *sm, const u8 *addr) { struct wpa_tdls_peer *peer; if (sm->tdls_disabled || !sm->tdls_supported) return "disabled"; for (peer = sm->tdls; peer; peer = peer->next) { if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) break; } if (peer == NULL) return "peer does not exist"; if (!peer->tpk_success) return "peer not connected"; return "connected"; } static int wpa_tdls_recv_teardown(struct wpa_sm *sm, const u8 *src_addr, const u8 *buf, size_t len) { struct wpa_tdls_peer *peer = NULL; struct wpa_tdls_ftie *ftie; struct wpa_tdls_lnkid *lnkid; struct wpa_eapol_ie_parse kde; u16 reason_code; const u8 *pos; int ielen; /* Find the node and free from the list */ for (peer = sm->tdls; peer; peer = peer->next) { if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) break; } if (peer == NULL) { wpa_printf(MSG_INFO, "TDLS: No matching entry found for " "Teardown " MACSTR, MAC2STR(src_addr)); return 0; } pos = buf; pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; reason_code = WPA_GET_LE16(pos); pos += 2; wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown Request from " MACSTR " (reason code %u)", MAC2STR(src_addr), reason_code); ielen = len - (pos - buf); /* start of IE in buf */ if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) { wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in Teardown"); return -1; } if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TDLS " "Teardown"); return -1; } lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success) goto skip_ftie; if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) { wpa_printf(MSG_INFO, "TDLS: No FTIE in TDLS Teardown"); return -1; } ftie = (struct wpa_tdls_ftie *) kde.ftie; /* Process MIC check to see if TDLS Teardown is right */ if (wpa_supplicant_verify_tdls_mic_teardown(4, reason_code, peer->dtoken, peer, (u8 *) lnkid, ftie) < 0) { wpa_printf(MSG_DEBUG, "TDLS: MIC failure for TDLS " "Teardown Request from " MACSTR, MAC2STR(src_addr)); return -1; } skip_ftie: /* * Request the driver to disable the direct link and clear associated * keys. */ wpa_tdls_disable_peer_link(sm, peer); return 0; } /** * wpa_tdls_send_error - To send suitable TDLS status response with * appropriate status code mentioning reason for error/failure. * @dst - MAC addr of Peer station * @tdls_action - TDLS frame type for which error code is sent * @status - status code mentioning reason */ static int wpa_tdls_send_error(struct wpa_sm *sm, const u8 *dst, u8 tdls_action, u8 dialog_token, u16 status) { wpa_printf(MSG_DEBUG, "TDLS: Sending error to " MACSTR " (action=%u status=%u)", MAC2STR(dst), tdls_action, status); return wpa_tdls_tpk_send(sm, dst, tdls_action, dialog_token, status, 0, NULL, 0); } static struct wpa_tdls_peer * wpa_tdls_add_peer(struct wpa_sm *sm, const u8 *addr, int *existing) { struct wpa_tdls_peer *peer; if (existing) *existing = 0; for (peer = sm->tdls; peer; peer = peer->next) { if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) { if (existing) *existing = 1; return peer; /* re-use existing entry */ } } wpa_printf(MSG_INFO, "TDLS: Creating peer entry for " MACSTR, MAC2STR(addr)); peer = os_zalloc(sizeof(*peer)); if (peer == NULL) return NULL; os_memcpy(peer->addr, addr, ETH_ALEN); peer->next = sm->tdls; sm->tdls = peer; return peer; } static int wpa_tdls_send_tpk_m1(struct wpa_sm *sm, struct wpa_tdls_peer *peer) { size_t buf_len; struct wpa_tdls_timeoutie timeoutie; u16 rsn_capab; struct wpa_tdls_ftie *ftie; u8 *rbuf, *pos, *count_pos; u16 count; struct rsn_ie_hdr *hdr; int status; if (!wpa_tdls_get_privacy(sm)) { wpa_printf(MSG_DEBUG, "TDLS: No security used on the link"); peer->rsnie_i_len = 0; goto skip_rsnie; } /* * TPK Handshake Message 1: * FTIE: ANonce=0, SNonce=initiator nonce MIC=0, DataKDs=(RSNIE_I, * Timeout Interval IE)) */ /* Filling RSN IE */ hdr = (struct rsn_ie_hdr *) peer->rsnie_i; hdr->elem_id = WLAN_EID_RSN; WPA_PUT_LE16(hdr->version, RSN_VERSION); pos = (u8 *) (hdr + 1); RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED); pos += RSN_SELECTOR_LEN; count_pos = pos; pos += 2; count = 0; /* * AES-CCMP is the default Encryption preferred for TDLS, so * RSN IE is filled only with CCMP CIPHER * Note: TKIP is not used to encrypt TDLS link. * * Regardless of the cipher used on the AP connection, select CCMP * here. */ RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); pos += RSN_SELECTOR_LEN; count++; WPA_PUT_LE16(count_pos, count); WPA_PUT_LE16(pos, 1); pos += 2; RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE); pos += RSN_SELECTOR_LEN; rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2; #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) { wpa_printf(MSG_DEBUG, "TDLS: Use alternative RSN IE for " "testing"); rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; } #endif /* CONFIG_TDLS_TESTING */ WPA_PUT_LE16(pos, rsn_capab); pos += 2; #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) { /* Number of PMKIDs */ *pos++ = 0x00; *pos++ = 0x00; } #endif /* CONFIG_TDLS_TESTING */ hdr->len = (pos - peer->rsnie_i) - 2; peer->rsnie_i_len = pos - peer->rsnie_i; wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake", peer->rsnie_i, peer->rsnie_i_len); skip_rsnie: buf_len = 0; if (wpa_tdls_get_privacy(sm)) buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) + sizeof(struct wpa_tdls_timeoutie); #ifdef CONFIG_TDLS_TESTING if (wpa_tdls_get_privacy(sm) && (tdls_testing & TDLS_TESTING_LONG_FRAME)) buf_len += 170; if (tdls_testing & TDLS_TESTING_DIFF_BSSID) buf_len += sizeof(struct wpa_tdls_lnkid); #endif /* CONFIG_TDLS_TESTING */ rbuf = os_zalloc(buf_len + 1); if (rbuf == NULL) { wpa_tdls_peer_free(sm, peer); return -1; } pos = rbuf; if (!wpa_tdls_get_privacy(sm)) goto skip_ies; /* Initiator RSN IE */ pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len); ftie = (struct wpa_tdls_ftie *) pos; ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; if (os_get_random(peer->inonce, WPA_NONCE_LEN)) { wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "TDLS: Failed to get random data for initiator Nonce"); os_free(rbuf); wpa_tdls_peer_free(sm, peer); return -1; } wpa_hexdump(MSG_DEBUG, "TDLS: Initiator Nonce for TPK handshake", peer->inonce, WPA_NONCE_LEN); os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK Handshake M1", (u8 *) ftie, sizeof(struct wpa_tdls_ftie)); pos = (u8 *) (ftie + 1); #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_LONG_FRAME) { wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " "FTIE"); ftie->ie_len += 170; *pos++ = 255; /* FTIE subelem */ *pos++ = 168; /* FTIE subelem length */ pos += 168; } #endif /* CONFIG_TDLS_TESTING */ /* Lifetime */ peer->lifetime = TPK_LIFETIME; #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_SHORT_LIFETIME) { wpa_printf(MSG_DEBUG, "TDLS: Testing - use short TPK " "lifetime"); peer->lifetime = 301; } if (tdls_testing & TDLS_TESTING_LONG_LIFETIME) { wpa_printf(MSG_DEBUG, "TDLS: Testing - use long TPK " "lifetime"); peer->lifetime = 0xffffffff; } #endif /* CONFIG_TDLS_TESTING */ pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, sizeof(timeoutie), peer->lifetime); wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime); skip_ies: #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_DIFF_BSSID) { wpa_printf(MSG_DEBUG, "TDLS: Testing - use incorrect BSSID in " "Link Identifier"); struct wpa_tdls_lnkid *l = (struct wpa_tdls_lnkid *) pos; wpa_tdls_linkid(sm, peer, l); l->bssid[5] ^= 0x01; pos += sizeof(*l); } #endif /* CONFIG_TDLS_TESTING */ wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Request / TPK " "Handshake Message 1 (peer " MACSTR ")", MAC2STR(peer->addr)); status = wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_SETUP_REQUEST, 1, 0, 0, rbuf, pos - rbuf); os_free(rbuf); return status; } static int wpa_tdls_send_tpk_m2(struct wpa_sm *sm, const unsigned char *src_addr, u8 dtoken, struct wpa_tdls_lnkid *lnkid, const struct wpa_tdls_peer *peer) { u8 *rbuf, *pos; size_t buf_len; u32 lifetime; struct wpa_tdls_timeoutie timeoutie; struct wpa_tdls_ftie *ftie; int status; buf_len = 0; if (wpa_tdls_get_privacy(sm)) { /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce), * Lifetime */ buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) + sizeof(struct wpa_tdls_timeoutie); #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_LONG_FRAME) buf_len += 170; #endif /* CONFIG_TDLS_TESTING */ } rbuf = os_zalloc(buf_len + 1); if (rbuf == NULL) return -1; pos = rbuf; if (!wpa_tdls_get_privacy(sm)) goto skip_ies; /* Peer RSN IE */ pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len); ftie = (struct wpa_tdls_ftie *) pos; ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; /* TODO: ftie->mic_control to set 2-RESPONSE */ os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN); os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK M2", (u8 *) ftie, sizeof(*ftie)); pos = (u8 *) (ftie + 1); #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_LONG_FRAME) { wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " "FTIE"); ftie->ie_len += 170; *pos++ = 255; /* FTIE subelem */ *pos++ = 168; /* FTIE subelem length */ pos += 168; } #endif /* CONFIG_TDLS_TESTING */ /* Lifetime */ lifetime = peer->lifetime; #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_RESP) { wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK " "lifetime in response"); lifetime++; } #endif /* CONFIG_TDLS_TESTING */ pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, sizeof(timeoutie), lifetime); wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds from initiator", lifetime); /* compute MIC before sending */ wpa_tdls_ftie_mic(peer->tpk.kck, 2, (u8 *) lnkid, peer->rsnie_p, (u8 *) &timeoutie, (u8 *) ftie, ftie->mic); #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_WRONG_MIC) { wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong MIC"); ftie->mic[0] ^= 0x01; } #endif /* CONFIG_TDLS_TESTING */ skip_ies: status = wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0, 0, rbuf, pos - rbuf); os_free(rbuf); return status; } static int wpa_tdls_send_tpk_m3(struct wpa_sm *sm, const unsigned char *src_addr, u8 dtoken, struct wpa_tdls_lnkid *lnkid, const struct wpa_tdls_peer *peer) { u8 *rbuf, *pos; size_t buf_len; struct wpa_tdls_ftie *ftie; struct wpa_tdls_timeoutie timeoutie; u32 lifetime; int status; u32 peer_capab = 0; buf_len = 0; if (wpa_tdls_get_privacy(sm)) { /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce), * Lifetime */ buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) + sizeof(struct wpa_tdls_timeoutie); #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_LONG_FRAME) buf_len += 170; #endif /* CONFIG_TDLS_TESTING */ } rbuf = os_zalloc(buf_len + 1); if (rbuf == NULL) return -1; pos = rbuf; if (!wpa_tdls_get_privacy(sm)) goto skip_ies; /* Peer RSN IE */ pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len); ftie = (struct wpa_tdls_ftie *) pos; ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION; /*TODO: ftie->mic_control to set 3-CONFIRM */ os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN); os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN); ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2; pos = (u8 *) (ftie + 1); #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_LONG_FRAME) { wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to " "FTIE"); ftie->ie_len += 170; *pos++ = 255; /* FTIE subelem */ *pos++ = 168; /* FTIE subelem length */ pos += 168; } #endif /* CONFIG_TDLS_TESTING */ /* Lifetime */ lifetime = peer->lifetime; #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_CONF) { wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK " "lifetime in confirm"); lifetime++; } #endif /* CONFIG_TDLS_TESTING */ pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie, sizeof(timeoutie), lifetime); wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime); /* compute MIC before sending */ wpa_tdls_ftie_mic(peer->tpk.kck, 3, (u8 *) lnkid, peer->rsnie_p, (u8 *) &timeoutie, (u8 *) ftie, ftie->mic); #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_WRONG_MIC) { wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong MIC"); ftie->mic[0] ^= 0x01; } #endif /* CONFIG_TDLS_TESTING */ skip_ies: if (peer->vht_capabilities) peer_capab |= TDLS_PEER_VHT; if (peer->ht_capabilities) peer_capab |= TDLS_PEER_HT; if (peer->wmm_capable) peer_capab |= TDLS_PEER_WMM; status = wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 0, peer_capab, rbuf, pos - rbuf); os_free(rbuf); return status; } static int wpa_tdls_send_discovery_response(struct wpa_sm *sm, struct wpa_tdls_peer *peer, u8 dialog_token) { wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Discovery Response " "(peer " MACSTR ")", MAC2STR(peer->addr)); return wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_DISCOVERY_RESPONSE, dialog_token, 0, 0, NULL, 0); } static int wpa_tdls_process_discovery_request(struct wpa_sm *sm, const u8 *addr, const u8 *buf, size_t len) { struct wpa_eapol_ie_parse kde; const struct wpa_tdls_lnkid *lnkid; struct wpa_tdls_peer *peer; size_t min_req_len = sizeof(struct wpa_tdls_frame) + 1 /* dialog token */ + sizeof(struct wpa_tdls_lnkid); u8 dialog_token; wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from " MACSTR, MAC2STR(addr)); if (len < min_req_len) { wpa_printf(MSG_DEBUG, "TDLS Discovery Request is too short: " "%d", (int) len); return -1; } dialog_token = buf[sizeof(struct wpa_tdls_frame)]; /* * Some APs will tack on a weird IE to the end of a TDLS * discovery request packet. This needn't fail the response, * since the required IE are verified separately. */ if (wpa_supplicant_parse_ies(buf + sizeof(struct wpa_tdls_frame) + 1, len - (sizeof(struct wpa_tdls_frame) + 1), &kde) < 0) { wpa_printf(MSG_DEBUG, "TDLS: Failed to parse IEs in Discovery Request - ignore as an interop workaround"); } if (!kde.lnkid) { wpa_printf(MSG_DEBUG, "TDLS: Link ID not found in Discovery " "Request"); return -1; } lnkid = (const struct wpa_tdls_lnkid *) kde.lnkid; if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from different " " BSS " MACSTR, MAC2STR(lnkid->bssid)); return -1; } peer = wpa_tdls_add_peer(sm, addr, NULL); if (peer == NULL) return -1; return wpa_tdls_send_discovery_response(sm, peer, dialog_token); } int wpa_tdls_send_discovery_request(struct wpa_sm *sm, const u8 *addr) { if (sm->tdls_disabled || !sm->tdls_supported) return -1; wpa_printf(MSG_DEBUG, "TDLS: Sending Discovery Request to peer " MACSTR, MAC2STR(addr)); return wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_DISCOVERY_REQUEST, 1, 0, 0, NULL, 0); } static int copy_supp_rates(const struct wpa_eapol_ie_parse *kde, struct wpa_tdls_peer *peer) { if (!kde->supp_rates) { wpa_printf(MSG_DEBUG, "TDLS: No supported rates received"); return -1; } peer->supp_rates_len = merge_byte_arrays( peer->supp_rates, sizeof(peer->supp_rates), kde->supp_rates + 2, kde->supp_rates_len - 2, kde->ext_supp_rates ? kde->ext_supp_rates + 2 : NULL, kde->ext_supp_rates_len - 2); return 0; } static int copy_peer_ht_capab(const struct wpa_eapol_ie_parse *kde, struct wpa_tdls_peer *peer) { if (!kde->ht_capabilities || kde->ht_capabilities_len < sizeof(struct ieee80211_ht_capabilities) ) { wpa_printf(MSG_DEBUG, "TDLS: No supported ht capabilities " "received"); return 0; } if (!peer->ht_capabilities) { peer->ht_capabilities = os_zalloc(sizeof(struct ieee80211_ht_capabilities)); if (peer->ht_capabilities == NULL) return -1; } os_memcpy(peer->ht_capabilities, kde->ht_capabilities, sizeof(struct ieee80211_ht_capabilities)); wpa_hexdump(MSG_DEBUG, "TDLS: Peer HT capabilities", (u8 *) peer->ht_capabilities, sizeof(struct ieee80211_ht_capabilities)); return 0; } static int copy_peer_vht_capab(const struct wpa_eapol_ie_parse *kde, struct wpa_tdls_peer *peer) { if (!kde->vht_capabilities || kde->vht_capabilities_len < sizeof(struct ieee80211_vht_capabilities) ) { wpa_printf(MSG_DEBUG, "TDLS: No supported vht capabilities " "received"); return 0; } if (!peer->vht_capabilities) { peer->vht_capabilities = os_zalloc(sizeof(struct ieee80211_vht_capabilities)); if (peer->vht_capabilities == NULL) return -1; } os_memcpy(peer->vht_capabilities, kde->vht_capabilities, sizeof(struct ieee80211_vht_capabilities)); wpa_hexdump(MSG_DEBUG, "TDLS: Peer VHT capabilities", (u8 *) peer->vht_capabilities, sizeof(struct ieee80211_vht_capabilities)); return 0; } static int copy_peer_ext_capab(const struct wpa_eapol_ie_parse *kde, struct wpa_tdls_peer *peer) { if (!kde->ext_capab) { wpa_printf(MSG_DEBUG, "TDLS: No extended capabilities " "received"); return 0; } if (!peer->ext_capab || peer->ext_capab_len < kde->ext_capab_len - 2) { /* Need to allocate buffer to fit the new information */ os_free(peer->ext_capab); peer->ext_capab = os_zalloc(kde->ext_capab_len - 2); if (peer->ext_capab == NULL) return -1; } peer->ext_capab_len = kde->ext_capab_len - 2; os_memcpy(peer->ext_capab, kde->ext_capab + 2, peer->ext_capab_len); return 0; } static int copy_peer_wmm_capab(const struct wpa_eapol_ie_parse *kde, struct wpa_tdls_peer *peer) { struct wmm_information_element *wmm; if (!kde->wmm) { wpa_printf(MSG_DEBUG, "TDLS: No supported WMM capabilities received"); return 0; } if (kde->wmm_len < sizeof(struct wmm_information_element)) { wpa_printf(MSG_DEBUG, "TDLS: Invalid supported WMM capabilities received"); return -1; } wmm = (struct wmm_information_element *) kde->wmm; peer->qos_info = wmm->qos_info; peer->wmm_capable = 1; wpa_printf(MSG_DEBUG, "TDLS: Peer WMM QOS Info 0x%x", peer->qos_info); return 0; } static int copy_peer_supp_channels(const struct wpa_eapol_ie_parse *kde, struct wpa_tdls_peer *peer) { if (!kde->supp_channels) { wpa_printf(MSG_DEBUG, "TDLS: No supported channels received"); return 0; } if (!peer->supp_channels || peer->supp_channels_len < kde->supp_channels_len) { os_free(peer->supp_channels); peer->supp_channels = os_zalloc(kde->supp_channels_len); if (peer->supp_channels == NULL) return -1; } peer->supp_channels_len = kde->supp_channels_len; os_memcpy(peer->supp_channels, kde->supp_channels, peer->supp_channels_len); wpa_hexdump(MSG_DEBUG, "TDLS: Peer Supported Channels", (u8 *) peer->supp_channels, peer->supp_channels_len); return 0; } static int copy_peer_supp_oper_classes(const struct wpa_eapol_ie_parse *kde, struct wpa_tdls_peer *peer) { if (!kde->supp_oper_classes) { wpa_printf(MSG_DEBUG, "TDLS: No supported operating classes received"); return 0; } if (!peer->supp_oper_classes || peer->supp_oper_classes_len < kde->supp_oper_classes_len) { os_free(peer->supp_oper_classes); peer->supp_oper_classes = os_zalloc(kde->supp_oper_classes_len); if (peer->supp_oper_classes == NULL) return -1; } peer->supp_oper_classes_len = kde->supp_oper_classes_len; os_memcpy(peer->supp_oper_classes, kde->supp_oper_classes, peer->supp_oper_classes_len); wpa_hexdump(MSG_DEBUG, "TDLS: Peer Supported Operating Classes", (u8 *) peer->supp_oper_classes, peer->supp_oper_classes_len); return 0; } static int wpa_tdls_addset_peer(struct wpa_sm *sm, struct wpa_tdls_peer *peer, int add) { return wpa_sm_tdls_peer_addset(sm, peer->addr, add, peer->aid, peer->capability, peer->supp_rates, peer->supp_rates_len, peer->ht_capabilities, peer->vht_capabilities, peer->qos_info, peer->ext_capab, peer->ext_capab_len, peer->supp_channels, peer->supp_channels_len, peer->supp_oper_classes, peer->supp_oper_classes_len); } static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr, const u8 *buf, size_t len) { struct wpa_tdls_peer *peer; struct wpa_eapol_ie_parse kde; struct wpa_ie_data ie; int cipher; const u8 *cpos; struct wpa_tdls_ftie *ftie = NULL; struct wpa_tdls_timeoutie *timeoutie; struct wpa_tdls_lnkid *lnkid; u32 lifetime = 0; #if 0 struct rsn_ie_hdr *hdr; u8 *pos; u16 rsn_capab; u16 rsn_ver; #endif u8 dtoken; u16 ielen; u16 status = WLAN_STATUS_UNSPECIFIED_FAILURE; int tdls_prohibited = sm->tdls_prohibited; int existing_peer = 0; if (len < 3 + 3) return -1; cpos = buf; cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; /* driver had already verified the frame format */ dtoken = *cpos++; /* dialog token */ wpa_printf(MSG_INFO, "TDLS: Dialog Token in TPK M1 %d", dtoken); peer = wpa_tdls_add_peer(sm, src_addr, &existing_peer); if (peer == NULL) goto error; /* If found, use existing entry instead of adding a new one; * how to handle the case where both ends initiate at the * same time? */ if (existing_peer) { if (peer->tpk_success) { wpa_printf(MSG_DEBUG, "TDLS: TDLS Setup Request while " "direct link is enabled - tear down the " "old link first"); wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); wpa_tdls_peer_clear(sm, peer); } else if (peer->initiator) { /* * An entry is already present, so check if we already * sent a TDLS Setup Request. If so, compare MAC * addresses and let the STA with the lower MAC address * continue as the initiator. The other negotiation is * terminated. */ if (os_memcmp(sm->own_addr, src_addr, ETH_ALEN) < 0) { wpa_printf(MSG_DEBUG, "TDLS: Discard request " "from peer with higher address " MACSTR, MAC2STR(src_addr)); return -1; } else { wpa_printf(MSG_DEBUG, "TDLS: Accept request " "from peer with lower address " MACSTR " (terminate previously " "initiated negotiation", MAC2STR(src_addr)); wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); wpa_tdls_peer_clear(sm, peer); } } } /* capability information */ peer->capability = WPA_GET_LE16(cpos); cpos += 2; ielen = len - (cpos - buf); /* start of IE in buf */ if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0) { wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M1"); goto error; } if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in " "TPK M1"); goto error; } wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M1", kde.lnkid, kde.lnkid_len); lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { wpa_printf(MSG_INFO, "TDLS: TPK M1 from diff BSS"); status = WLAN_STATUS_NOT_IN_SAME_BSS; goto error; } wpa_printf(MSG_DEBUG, "TDLS: TPK M1 - TPK initiator " MACSTR, MAC2STR(src_addr)); if (copy_supp_rates(&kde, peer) < 0) goto error; if (copy_peer_ht_capab(&kde, peer) < 0) goto error; if (copy_peer_vht_capab(&kde, peer) < 0) goto error; if (copy_peer_ext_capab(&kde, peer) < 0) goto error; if (copy_peer_supp_channels(&kde, peer) < 0) goto error; if (copy_peer_supp_oper_classes(&kde, peer) < 0) goto error; peer->qos_info = kde.qosinfo; /* Overwrite with the qos_info obtained in WMM IE */ if (copy_peer_wmm_capab(&kde, peer) < 0) goto error; peer->aid = kde.aid; #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) { peer = wpa_tdls_add_peer(sm, src_addr, NULL); if (peer == NULL) goto error; wpa_printf(MSG_DEBUG, "TDLS: Testing concurrent initiation of " "TDLS setup - send own request"); peer->initiator = 1; wpa_tdls_send_tpk_m1(sm, peer); } if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) && tdls_prohibited) { wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition " "on TDLS"); tdls_prohibited = 0; } #endif /* CONFIG_TDLS_TESTING */ if (tdls_prohibited) { wpa_printf(MSG_INFO, "TDLS: TDLS prohibited in this BSS"); status = WLAN_STATUS_REQUEST_DECLINED; goto error; } if (!wpa_tdls_get_privacy(sm)) { if (kde.rsn_ie) { wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M1 while " "security is disabled"); status = WLAN_STATUS_SECURITY_DISABLED; goto error; } goto skip_rsn; } if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) || kde.rsn_ie == NULL) { wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M1"); status = WLAN_STATUS_INVALID_PARAMETERS; goto error; } if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) { wpa_printf(MSG_INFO, "TDLS: Too long Initiator RSN IE in " "TPK M1"); status = WLAN_STATUS_INVALID_RSNIE; goto error; } if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) { wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M1"); status = WLAN_STATUS_INVALID_RSNIE; goto error; } cipher = ie.pairwise_cipher; if (cipher & WPA_CIPHER_CCMP) { wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link"); cipher = WPA_CIPHER_CCMP; } else { wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M1"); status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID; goto error; } if ((ie.capabilities & (WPA_CAPABILITY_NO_PAIRWISE | WPA_CAPABILITY_PEERKEY_ENABLED)) != WPA_CAPABILITY_PEERKEY_ENABLED) { wpa_printf(MSG_INFO, "TDLS: Invalid RSN Capabilities in " "TPK M1"); status = WLAN_STATUS_INVALID_RSN_IE_CAPAB; goto error; } /* Lifetime */ if (kde.key_lifetime == NULL) { wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1"); status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; goto error; } timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime; lifetime = WPA_GET_LE32(timeoutie->value); wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime); if (lifetime < 300) { wpa_printf(MSG_INFO, "TDLS: Too short TPK lifetime"); status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; goto error; } skip_rsn: #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) { if (os_memcmp(sm->own_addr, peer->addr, ETH_ALEN) < 0) { /* * The request frame from us is going to win, so do not * replace information based on this request frame from * the peer. */ goto skip_rsn_check; } } #endif /* CONFIG_TDLS_TESTING */ peer->initiator = 0; /* Need to check */ peer->dtoken = dtoken; if (!wpa_tdls_get_privacy(sm)) { peer->rsnie_i_len = 0; peer->rsnie_p_len = 0; peer->cipher = WPA_CIPHER_NONE; goto skip_rsn_check; } ftie = (struct wpa_tdls_ftie *) kde.ftie; os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len); peer->rsnie_i_len = kde.rsn_ie_len; peer->cipher = cipher; if (os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) != 0) { /* * There is no point in updating the RNonce for every obtained * TPK M1 frame (e.g., retransmission due to timeout) with the * same INonce (SNonce in FTIE). However, if the TPK M1 is * retransmitted with a different INonce, update the RNonce * since this is for a new TDLS session. */ wpa_printf(MSG_DEBUG, "TDLS: New TPK M1 INonce - generate new RNonce"); os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN); if (os_get_random(peer->rnonce, WPA_NONCE_LEN)) { wpa_msg(sm->ctx->ctx, MSG_WARNING, "TDLS: Failed to get random data for responder nonce"); goto error; } } #if 0 /* get version info from RSNIE received from Peer */ hdr = (struct rsn_ie_hdr *) kde.rsn_ie; rsn_ver = WPA_GET_LE16(hdr->version); /* use min(peer's version, out version) */ if (rsn_ver > RSN_VERSION) rsn_ver = RSN_VERSION; hdr = (struct rsn_ie_hdr *) peer->rsnie_p; hdr->elem_id = WLAN_EID_RSN; WPA_PUT_LE16(hdr->version, rsn_ver); pos = (u8 *) (hdr + 1); RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED); pos += RSN_SELECTOR_LEN; /* Include only the selected cipher in pairwise cipher suite */ WPA_PUT_LE16(pos, 1); pos += 2; if (cipher == WPA_CIPHER_CCMP) RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); pos += RSN_SELECTOR_LEN; WPA_PUT_LE16(pos, 1); pos += 2; RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE); pos += RSN_SELECTOR_LEN; rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED; rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2; WPA_PUT_LE16(pos, rsn_capab); pos += 2; hdr->len = (pos - peer->rsnie_p) - 2; peer->rsnie_p_len = pos - peer->rsnie_p; #endif /* temp fix: validation of RSNIE later */ os_memcpy(peer->rsnie_p, peer->rsnie_i, peer->rsnie_i_len); peer->rsnie_p_len = peer->rsnie_i_len; wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake", peer->rsnie_p, peer->rsnie_p_len); peer->lifetime = lifetime; wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid); skip_rsn_check: /* add supported rates, capabilities, and qos_info to the TDLS peer */ if (wpa_tdls_addset_peer(sm, peer, 1) < 0) goto error; peer->tpk_in_progress = 1; wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Response / TPK M2"); if (wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer) < 0) { wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); goto error; } return 0; error: wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, status); if (peer) wpa_tdls_peer_free(sm, peer); return -1; } static int wpa_tdls_enable_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer) { peer->tpk_success = 1; peer->tpk_in_progress = 0; eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer); if (wpa_tdls_get_privacy(sm)) { u32 lifetime = peer->lifetime; /* * Start the initiator process a bit earlier to avoid race * condition with the responder sending teardown request. */ if (lifetime > 3 && peer->initiator) lifetime -= 3; eloop_register_timeout(lifetime, 0, wpa_tdls_tpk_timeout, sm, peer); #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_NO_TPK_EXPIRATION) { wpa_printf(MSG_DEBUG, "TDLS: Testing - disable TPK " "expiration"); eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer); } #endif /* CONFIG_TDLS_TESTING */ } if (peer->reconfig_key && wpa_tdls_set_key(sm, peer) < 0) { wpa_printf(MSG_INFO, "TDLS: Could not configure key to the " "driver"); return -1; } peer->reconfig_key = 0; return wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, peer->addr); } static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr, const u8 *buf, size_t len) { struct wpa_tdls_peer *peer; struct wpa_eapol_ie_parse kde; struct wpa_ie_data ie; int cipher; struct wpa_tdls_ftie *ftie; struct wpa_tdls_timeoutie *timeoutie; struct wpa_tdls_lnkid *lnkid; u32 lifetime; u8 dtoken; int ielen; u16 status; const u8 *pos; int ret = 0; wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Response / TPK M2 " "(Peer " MACSTR ")", MAC2STR(src_addr)); for (peer = sm->tdls; peer; peer = peer->next) { if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) break; } if (peer == NULL) { wpa_printf(MSG_INFO, "TDLS: No matching peer found for " "TPK M2: " MACSTR, MAC2STR(src_addr)); return -1; } if (!peer->initiator) { /* * This may happen if both devices try to initiate TDLS at the * same time and we accept the TPK M1 from the peer in * wpa_tdls_process_tpk_m1() and clear our previous state. */ wpa_printf(MSG_INFO, "TDLS: We were not the initiator, so " "ignore TPK M2 from " MACSTR, MAC2STR(src_addr)); return -1; } wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_REQUEST); if (len < 3 + 2 + 1) { wpa_tdls_disable_peer_link(sm, peer); return -1; } pos = buf; pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; status = WPA_GET_LE16(pos); pos += 2 /* status code */; if (status != WLAN_STATUS_SUCCESS) { wpa_printf(MSG_INFO, "TDLS: Status code in TPK M2: %u", status); wpa_tdls_disable_peer_link(sm, peer); return -1; } status = WLAN_STATUS_UNSPECIFIED_FAILURE; /* TODO: need to verify dialog token matches here or in kernel */ dtoken = *pos++; /* dialog token */ wpa_printf(MSG_DEBUG, "TDLS: Dialog Token in TPK M2 %d", dtoken); if (len < 3 + 2 + 1 + 2) { wpa_tdls_disable_peer_link(sm, peer); return -1; } /* capability information */ peer->capability = WPA_GET_LE16(pos); pos += 2; ielen = len - (pos - buf); /* start of IE in buf */ if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0) { wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M2"); goto error; } #ifdef CONFIG_TDLS_TESTING if (tdls_testing & TDLS_TESTING_DECLINE_RESP) { wpa_printf(MSG_DEBUG, "TDLS: Testing - decline response"); status = WLAN_STATUS_REQUEST_DECLINED; goto error; } #endif /* CONFIG_TDLS_TESTING */ if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in " "TPK M2"); goto error; } wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M2", kde.lnkid, kde.lnkid_len); lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { wpa_printf(MSG_INFO, "TDLS: TPK M2 from different BSS"); status = WLAN_STATUS_NOT_IN_SAME_BSS; goto error; } if (copy_supp_rates(&kde, peer) < 0) goto error; if (copy_peer_ht_capab(&kde, peer) < 0) goto error; if (copy_peer_vht_capab(&kde, peer) < 0) goto error; if (copy_peer_ext_capab(&kde, peer) < 0) goto error; if (copy_peer_supp_channels(&kde, peer) < 0) goto error; if (copy_peer_supp_oper_classes(&kde, peer) < 0) goto error; peer->qos_info = kde.qosinfo; /* Overwrite with the qos_info obtained in WMM IE */ if (copy_peer_wmm_capab(&kde, peer) < 0) goto error; peer->aid = kde.aid; if (!wpa_tdls_get_privacy(sm)) { peer->rsnie_p_len = 0; peer->cipher = WPA_CIPHER_NONE; goto skip_rsn; } if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) || kde.rsn_ie == NULL) { wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M2"); status = WLAN_STATUS_INVALID_PARAMETERS; goto error; } wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2", kde.rsn_ie, kde.rsn_ie_len); if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) { wpa_printf(MSG_INFO, "TDLS: Too long Responder RSN IE in TPK M2"); status = WLAN_STATUS_INVALID_RSNIE; goto error; } /* * FIX: bitwise comparison of RSN IE is not the correct way of * validation this. It can be different, but certain fields must * match. Since we list only a single pairwise cipher in TPK M1, the * memcmp is likely to work in most cases, though. */ if (kde.rsn_ie_len != peer->rsnie_i_len || os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) != 0) { wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M2 does " "not match with RSN IE used in TPK M1"); wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Sent in TPK M1", peer->rsnie_i, peer->rsnie_i_len); wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2", kde.rsn_ie, kde.rsn_ie_len); status = WLAN_STATUS_INVALID_RSNIE; goto error; } if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) { wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M2"); status = WLAN_STATUS_INVALID_RSNIE; goto error; } cipher = ie.pairwise_cipher; if (cipher == WPA_CIPHER_CCMP) { wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link"); cipher = WPA_CIPHER_CCMP; } else { wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M2"); status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID; goto error; } wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M2", kde.ftie, sizeof(*ftie)); ftie = (struct wpa_tdls_ftie *) kde.ftie; if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) { wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does " "not match with FTIE SNonce used in TPK M1"); /* Silently discard the frame */ return -1; } /* Responder Nonce and RSN IE */ os_memcpy(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN); os_memcpy(peer->rsnie_p, kde.rsn_ie, kde.rsn_ie_len); peer->rsnie_p_len = kde.rsn_ie_len; peer->cipher = cipher; /* Lifetime */ if (kde.key_lifetime == NULL) { wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M2"); status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; goto error; } timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime; lifetime = WPA_GET_LE32(timeoutie->value); wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M2", lifetime); if (lifetime != peer->lifetime) { wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in " "TPK M2 (expected %u)", lifetime, peer->lifetime); status = WLAN_STATUS_UNACCEPTABLE_LIFETIME; goto error; } wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid); /* Process MIC check to see if TPK M2 is right */ if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid, (u8 *) timeoutie, ftie) < 0) { /* Discard the frame */ wpa_tdls_del_key(sm, peer); wpa_tdls_disable_peer_link(sm, peer); return -1; } if (wpa_tdls_set_key(sm, peer) < 0) { /* * Some drivers may not be able to config the key prior to full * STA entry having been configured. */ wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after " "STA entry is complete"); peer->reconfig_key = 1; } skip_rsn: peer->dtoken = dtoken; /* add supported rates, capabilities, and qos_info to the TDLS peer */ if (wpa_tdls_addset_peer(sm, peer, 0) < 0) goto error; wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Confirm / " "TPK Handshake Message 3"); if (wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer) < 0) goto error; if (!peer->tpk_success) { /* * Enable Link only when tpk_success is 0, signifying that this * processing of TPK M2 frame is not because of a retransmission * during TDLS setup handshake. */ ret = wpa_tdls_enable_link(sm, peer); if (ret < 0) { wpa_printf(MSG_DEBUG, "TDLS: Could not enable link"); wpa_tdls_do_teardown( sm, peer, WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED); } } return ret; error: wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, status); wpa_tdls_disable_peer_link(sm, peer); return -1; } static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr, const u8 *buf, size_t len) { struct wpa_tdls_peer *peer; struct wpa_eapol_ie_parse kde; struct wpa_tdls_ftie *ftie; struct wpa_tdls_timeoutie *timeoutie; struct wpa_tdls_lnkid *lnkid; int ielen; u16 status; const u8 *pos; u32 lifetime; int ret = 0; wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Confirm / TPK M3 " "(Peer " MACSTR ")", MAC2STR(src_addr)); for (peer = sm->tdls; peer; peer = peer->next) { if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) break; } if (peer == NULL) { wpa_printf(MSG_INFO, "TDLS: No matching peer found for " "TPK M3: " MACSTR, MAC2STR(src_addr)); return -1; } wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_RESPONSE); if (len < 3 + 3) goto error; pos = buf; pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */; status = WPA_GET_LE16(pos); if (status != 0) { wpa_printf(MSG_INFO, "TDLS: Status code in TPK M3: %u", status); goto error; } pos += 2 /* status code */ + 1 /* dialog token */; ielen = len - (pos - buf); /* start of IE in buf */ /* * Don't reject the message if failing to parse IEs. The IEs we need are * explicitly checked below. Some APs piggy-back broken IEs to the end * of a TDLS Confirm packet, which will fail the link if we don't ignore * this error. */ if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) { wpa_printf(MSG_DEBUG, "TDLS: Failed to parse KDEs in TPK M3 - ignore as an interop workaround"); } if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) { wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M3"); goto error; } wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M3", (u8 *) kde.lnkid, kde.lnkid_len); lnkid = (struct wpa_tdls_lnkid *) kde.lnkid; if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) { wpa_printf(MSG_INFO, "TDLS: TPK M3 from diff BSS"); goto error; } if (!wpa_tdls_get_privacy(sm)) goto skip_rsn; if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) { wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M3"); goto error; } wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M3", kde.ftie, sizeof(*ftie)); ftie = (struct wpa_tdls_ftie *) kde.ftie; if (kde.rsn_ie == NULL) { wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M3"); goto error; } wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M3", kde.rsn_ie, kde.rsn_ie_len); if (kde.rsn_ie_len != peer->rsnie_p_len || os_memcmp(kde.rsn_ie, peer->rsnie_p, peer->rsnie_p_len) != 0) { wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M3 does not match " "with the one sent in TPK M2"); goto error; } if (!os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) { wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does " "not match with FTIE ANonce used in TPK M2"); goto error; } if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) { wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M3 does not " "match with FTIE SNonce used in TPK M1"); goto error; } if (kde.key_lifetime == NULL) { wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M3"); goto error; } timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime; wpa_hexdump(MSG_DEBUG, "TDLS: Timeout IE Received from TPK M3", (u8 *) timeoutie, sizeof(*timeoutie)); lifetime = WPA_GET_LE32(timeoutie->value); wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M3", lifetime); if (lifetime != peer->lifetime) { wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in " "TPK M3 (expected %u)", lifetime, peer->lifetime); goto error; } if (wpa_supplicant_verify_tdls_mic(3, peer, (u8 *) lnkid, (u8 *) timeoutie, ftie) < 0) { wpa_tdls_del_key(sm, peer); goto error; } if (wpa_tdls_set_key(sm, peer) < 0) { /* * Some drivers may not be able to config the key prior to full * STA entry having been configured. */ wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after " "STA entry is complete"); peer->reconfig_key = 1; } skip_rsn: /* add supported rates, capabilities, and qos_info to the TDLS peer */ if (wpa_tdls_addset_peer(sm, peer, 0) < 0) goto error; if (!peer->tpk_success) { /* * Enable Link only when tpk_success is 0, signifying that this * processing of TPK M3 frame is not because of a retransmission * during TDLS setup handshake. */ ret = wpa_tdls_enable_link(sm, peer); if (ret < 0) { wpa_printf(MSG_DEBUG, "TDLS: Could not enable link"); goto error; } } return ret; error: wpa_tdls_do_teardown(sm, peer, WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED); return -1; } static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs) { struct wpa_tdls_timeoutie *lifetime = (struct wpa_tdls_timeoutie *) ie; os_memset(lifetime, 0, ie_len); lifetime->ie_type = WLAN_EID_TIMEOUT_INTERVAL; lifetime->ie_len = sizeof(struct wpa_tdls_timeoutie) - 2; lifetime->interval_type = WLAN_TIMEOUT_KEY_LIFETIME; WPA_PUT_LE32(lifetime->value, tsecs); os_memcpy(pos, ie, ie_len); return pos + ie_len; } /** * wpa_tdls_start - Initiate TDLS handshake (send TPK Handshake Message 1) * @sm: Pointer to WPA state machine data from wpa_sm_init() * @peer: MAC address of the peer STA * Returns: 0 on success, or -1 on failure * * Send TPK Handshake Message 1 info to driver to start TDLS * handshake with the peer. */ int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr) { struct wpa_tdls_peer *peer; int tdls_prohibited = sm->tdls_prohibited; if (sm->tdls_disabled || !sm->tdls_supported) return -1; #ifdef CONFIG_TDLS_TESTING if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) && tdls_prohibited) { wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition " "on TDLS"); tdls_prohibited = 0; } #endif /* CONFIG_TDLS_TESTING */ if (tdls_prohibited) { wpa_printf(MSG_DEBUG, "TDLS: TDLS is prohibited in this BSS - " "reject request to start setup"); return -1; } peer = wpa_tdls_add_peer(sm, addr, NULL); if (peer == NULL) return -1; if (peer->tpk_in_progress) { wpa_printf(MSG_DEBUG, "TDLS: Setup is already in progress with the peer"); return 0; } peer->initiator = 1; /* add the peer to the driver as a "setup in progress" peer */ if (wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL, NULL, 0, NULL, 0, NULL, 0, NULL, 0)) { wpa_tdls_disable_peer_link(sm, peer); return -1; } peer->tpk_in_progress = 1; if (wpa_tdls_send_tpk_m1(sm, peer) < 0) { wpa_tdls_disable_peer_link(sm, peer); return -1; } return 0; } void wpa_tdls_remove(struct wpa_sm *sm, const u8 *addr) { struct wpa_tdls_peer *peer; if (sm->tdls_disabled || !sm->tdls_supported) return; for (peer = sm->tdls; peer; peer = peer->next) { if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) break; } if (peer == NULL || !peer->tpk_success) return; if (sm->tdls_external_setup) { /* * Disable previous link to allow renegotiation to be completed * on AP path. */ wpa_tdls_do_teardown(sm, peer, WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED); } } /** * wpa_supplicant_rx_tdls - Receive TDLS data frame * * This function is called to receive TDLS (ethertype = 0x890d) data frames. */ static void wpa_supplicant_rx_tdls(void *ctx, const u8 *src_addr, const u8 *buf, size_t len) { struct wpa_sm *sm = ctx; struct wpa_tdls_frame *tf; wpa_hexdump(MSG_DEBUG, "TDLS: Received Data frame encapsulation", buf, len); if (sm->tdls_disabled || !sm->tdls_supported) { wpa_printf(MSG_DEBUG, "TDLS: Discard message - TDLS disabled " "or unsupported by driver"); return; } if (os_memcmp(src_addr, sm->own_addr, ETH_ALEN) == 0) { wpa_printf(MSG_DEBUG, "TDLS: Discard copy of own message"); return; } if (len < sizeof(*tf)) { wpa_printf(MSG_INFO, "TDLS: Drop too short frame"); return; } /* Check to make sure its a valid encapsulated TDLS frame */ tf = (struct wpa_tdls_frame *) buf; if (tf->payloadtype != 2 /* TDLS_RFTYPE */ || tf->category != WLAN_ACTION_TDLS) { wpa_printf(MSG_INFO, "TDLS: Invalid frame - payloadtype=%u " "category=%u action=%u", tf->payloadtype, tf->category, tf->action); return; } switch (tf->action) { case WLAN_TDLS_SETUP_REQUEST: wpa_tdls_process_tpk_m1(sm, src_addr, buf, len); break; case WLAN_TDLS_SETUP_RESPONSE: wpa_tdls_process_tpk_m2(sm, src_addr, buf, len); break; case WLAN_TDLS_SETUP_CONFIRM: wpa_tdls_process_tpk_m3(sm, src_addr, buf, len); break; case WLAN_TDLS_TEARDOWN: wpa_tdls_recv_teardown(sm, src_addr, buf, len); break; case WLAN_TDLS_DISCOVERY_REQUEST: wpa_tdls_process_discovery_request(sm, src_addr, buf, len); break; default: /* Kernel code will process remaining frames */ wpa_printf(MSG_DEBUG, "TDLS: Ignore TDLS frame action code %u", tf->action); break; } } /** * wpa_tdls_init - Initialize driver interface parameters for TDLS * @wpa_s: Pointer to wpa_supplicant data * Returns: 0 on success, -1 on failure * * This function is called to initialize driver interface parameters for TDLS. * wpa_drv_init() must have been called before this function to initialize the * driver interface. */ int wpa_tdls_init(struct wpa_sm *sm) { if (sm == NULL) return -1; sm->l2_tdls = l2_packet_init(sm->bridge_ifname ? sm->bridge_ifname : sm->ifname, sm->own_addr, ETH_P_80211_ENCAP, wpa_supplicant_rx_tdls, sm, 0); if (sm->l2_tdls == NULL) { wpa_printf(MSG_ERROR, "TDLS: Failed to open l2_packet " "connection"); return -1; } /* * Drivers that support TDLS but don't implement the get_capa callback * are assumed to perform everything internally */ if (wpa_sm_tdls_get_capa(sm, &sm->tdls_supported, &sm->tdls_external_setup) < 0) { sm->tdls_supported = 1; sm->tdls_external_setup = 0; } wpa_printf(MSG_DEBUG, "TDLS: TDLS operation%s supported by " "driver", sm->tdls_supported ? "" : " not"); wpa_printf(MSG_DEBUG, "TDLS: Driver uses %s link setup", sm->tdls_external_setup ? "external" : "internal"); return 0; } void wpa_tdls_teardown_peers(struct wpa_sm *sm) { struct wpa_tdls_peer *peer, *tmp; peer = sm->tdls; wpa_printf(MSG_DEBUG, "TDLS: Tear down peers"); while (peer) { tmp = peer->next; wpa_printf(MSG_DEBUG, "TDLS: Tear down peer " MACSTR, MAC2STR(peer->addr)); if (sm->tdls_external_setup) wpa_tdls_do_teardown(sm, peer, WLAN_REASON_DEAUTH_LEAVING); else wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr); peer = tmp; } } static void wpa_tdls_remove_peers(struct wpa_sm *sm) { struct wpa_tdls_peer *peer, *tmp; peer = sm->tdls; while (peer) { int res; tmp = peer->next; res = wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr); wpa_printf(MSG_DEBUG, "TDLS: Remove peer " MACSTR " (res=%d)", MAC2STR(peer->addr), res); wpa_tdls_peer_free(sm, peer); peer = tmp; } } /** * wpa_tdls_deinit - Deinitialize driver interface parameters for TDLS * * This function is called to recover driver interface parameters for TDLS * and frees resources allocated for it. */ void wpa_tdls_deinit(struct wpa_sm *sm) { if (sm == NULL) return; if (sm->l2_tdls) l2_packet_deinit(sm->l2_tdls); sm->l2_tdls = NULL; wpa_tdls_remove_peers(sm); } void wpa_tdls_assoc(struct wpa_sm *sm) { wpa_printf(MSG_DEBUG, "TDLS: Remove peers on association"); wpa_tdls_remove_peers(sm); } void wpa_tdls_disassoc(struct wpa_sm *sm) { wpa_printf(MSG_DEBUG, "TDLS: Remove peers on disassociation"); wpa_tdls_remove_peers(sm); } static int wpa_tdls_prohibited(const u8 *ies, size_t len) { struct wpa_eapol_ie_parse elems; if (ies == NULL) return 0; if (wpa_supplicant_parse_ies(ies, len, &elems) < 0) return 0; if (elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5) return 0; /* bit 38 - TDLS Prohibited */ return !!(elems.ext_capab[2 + 4] & 0x40); } void wpa_tdls_ap_ies(struct wpa_sm *sm, const u8 *ies, size_t len) { sm->tdls_prohibited = wpa_tdls_prohibited(ies, len); wpa_printf(MSG_DEBUG, "TDLS: TDLS is %s in the target BSS", sm->tdls_prohibited ? "prohibited" : "allowed"); } void wpa_tdls_assoc_resp_ies(struct wpa_sm *sm, const u8 *ies, size_t len) { if (!sm->tdls_prohibited && wpa_tdls_prohibited(ies, len)) { wpa_printf(MSG_DEBUG, "TDLS: TDLS prohibited based on " "(Re)Association Response IEs"); sm->tdls_prohibited = 1; } } void wpa_tdls_enable(struct wpa_sm *sm, int enabled) { wpa_printf(MSG_DEBUG, "TDLS: %s", enabled ? "enabled" : "disabled"); sm->tdls_disabled = !enabled; } int wpa_tdls_is_external_setup(struct wpa_sm *sm) { return sm->tdls_external_setup; }