--- /dev/null
+/*
+ * wpa_supplicant - TDLS
+ * Copyright (c) 2010-2011, Atheros Communications
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING 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" /* for set key */
+#include "drivers/driver.h"
+#include "l2_packet/l2_packet.h"
+
+#define SMK_RETRY_COUNT 3
+#define SMK_TIMEOUT 5000 /* 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]; /* Peer Nonce */
+ u8 Snonce[WPA_NONCE_LEN]; /* Initiator Nonce */
+ /* 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;
+
+#define TDLS_FRAME_TYPE(tf) (((struct wpa_tdls_frame *) tf)->action)
+
+static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs);
+static void wpa_tdls_smkretry_timeout(void *eloop_ctx, void *timeout_ctx);
+
+
+#define TDLS_MAX_IE_LEN 80
+struct wpa_tdls_peer {
+ struct wpa_tdls_peer *next;
+ int initiator; /* whether this end was initator for SMK handshake */
+ u8 addr[ETH_ALEN]; /* other end MAC address */
+ u8 inonce[WPA_NONCE_LEN]; /* Initiator Nonce */
+ u8 pnonce[WPA_NONCE_LEN]; /* Peer 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;
+ os_time_t expiration;
+ int cipher; /* Selected cipher (WPA_CIPHER_*) */
+
+#define TDLS_LNKID_LEN 20 /* T+L+V(18-octet) */
+ u8 lnkid[TDLS_LNKID_LEN];
+ u8 dtoken;
+
+ struct tpk {
+ u8 kck[16]; /* TPK-KCK */
+ u8 tk[16]; /* TPK-TK; assuming only CCMP will be used */
+ } tpk;
+ int tpk_set;
+
+ struct smk_timer {
+ u8 dest[ETH_ALEN];
+ int count; /* Retry Count: dot11RSNAConfigSMKUpdateCount
+ */
+ int timer; /* Timeout: 2000 milliseconds */
+ u8 action_code; /* TDLS frame type */
+ u8 dialog_token;
+ u16 status_code;
+ int buf_len; /* length of SMK message for retransmission */
+ u8 *buf; /* buffer for SMK message */
+ } sm_tmr;
+};
+
+
+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 PTK-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, "WPA: Pairwise Cipher Suite: "
+ "NONE - do not use pairwise keys");
+ return -1;
+ default:
+ wpa_printf(MSG_WARNING, "WPA: 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, "RSN: 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, const u8 *buf, size_t len)
+{
+ return wpa_sm_send_tdls_mgmt(sm, dst, action_code, dialog_token,
+ status_code, buf, len);
+}
+
+
+static int wpa_tdls_smk_send(struct wpa_sm *sm, const u8 *dest, u8 action_code,
+ u8 dialog_token, u16 status_code,
+ const u8 *msg, size_t msg_len)
+{
+ struct wpa_tdls_peer *peer;
+
+ wpa_printf(MSG_DEBUG, "TDLS: SMK Send dest=" MACSTR " action_code=%u "
+ "dialog_token=%u status_code=%u msg_len=%u",
+ MAC2STR(dest), action_code, dialog_token, status_code,
+ (unsigned int) msg_len);
+
+ if (wpa_tdls_send_tpk_msg(sm, dest, action_code, dialog_token,
+ status_code, 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)
+ 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_smkretry_timeout, sm, peer);
+
+ peer->sm_tmr.count = SMK_RETRY_COUNT;
+ peer->sm_tmr.timer = SMK_TIMEOUT; /* value in milliseconds */
+
+ /* 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.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, 0,
+ wpa_tdls_smkretry_timeout, sm, peer);
+ return 0;
+}
+
+
+static void tdls_clear_peer(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
+{
+ u8 mac[ETH_ALEN];
+ struct wpa_tdls_peer *tmp;
+
+ os_memcpy(mac, peer->addr, ETH_ALEN);
+ tmp = peer->next;
+ peer->initiator = 0;
+ eloop_cancel_timeout(wpa_tdls_smkretry_timeout, sm, peer);
+ os_free(peer->sm_tmr.buf);
+
+ /* reset all */
+ os_memset(peer, 0, sizeof(*peer));
+
+ /* restore things */
+ os_memcpy(peer->addr, mac, ETH_ALEN);
+ peer->next = tmp;
+}
+
+
+static void wpa_supplicant_smk_timeout(void *eloop_ctx, void *timeout_ctx)
+{
+ struct wpa_sm *sm = eloop_ctx;
+ struct wpa_tdls_peer *peer = timeout_ctx;
+ /* On SMK timer expiry initiate SMK followed by STK */
+ if (peer->initiator)
+ wpa_tdls_start(sm, peer->addr);
+ else {
+ /*TODO::: to send Request for new SMK/STK handshake */
+ ;
+ }
+}
+
+
+static void wpa_supplicant_peer_free(struct wpa_sm *sm,
+ struct wpa_tdls_peer *peer)
+{
+ if (peer->lifetime) {
+ eloop_cancel_timeout(wpa_supplicant_smk_timeout, sm, peer);
+ peer->lifetime = 0;
+ }
+ /* need to clear Peerkey SM */
+ tdls_clear_peer(sm, peer);
+ //os_free(peer);
+}
+
+
+static void wpa_tdls_smkretry_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--;
+ peer->sm_tmr.timer = SMK_TIMEOUT; /* value in milliseconds */
+
+ 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_smkretry_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.buf,
+ peer->sm_tmr.buf_len)) {
+ wpa_printf(MSG_INFO, "TDLS: Failed to retry "
+ "transmission");
+ }
+
+ eloop_cancel_timeout(wpa_tdls_smkretry_timeout, sm, peer);
+ eloop_register_timeout(peer->sm_tmr.timer / 1000, 0,
+ wpa_tdls_smkretry_timeout, sm, peer);
+ } else {
+ wpa_printf(MSG_INFO, "Sending Tear_Down Request");
+ wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr);
+
+ wpa_printf(MSG_INFO, "Clearing SM: Peerkey(" MACSTR ")",
+ MAC2STR(peer->addr));
+ eloop_cancel_timeout(wpa_tdls_smkretry_timeout, sm, peer);
+
+ /* clear the Peerkey statemachine */
+ wpa_supplicant_peer_free(sm, peer);
+ }
+}
+
+
+static void wpa_tdls_smkretry_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_smkretry_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->pnonce, WPA_NONCE_LEN) < 0) {
+ nonce[0] = peer->inonce;
+ nonce[1] = peer->pnonce;
+ } else {
+ nonce[0] = peer->pnonce;
+ 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: Dialogue 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(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(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_smk_timeout(void *eloop_ctx, void *timeout_ctx)
+{
+ struct wpa_sm *sm = eloop_ctx;
+ struct wpa_tdls_peer *peer = timeout_ctx;
+ /* On SMK timer expiry initiate SMK followed by STK */
+ if (peer->initiator)
+ wpa_tdls_start(sm, peer->addr);
+ else {
+ /*TODO::: to send Request for new SMK/STK handshake */
+ ;
+ }
+}
+
+static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
+{
+ if (peer->lifetime) {
+ eloop_cancel_timeout(wpa_tdls_smk_timeout, sm, peer);
+ peer->lifetime = 0;
+ }
+
+ /* need to clear Peerkey SM */
+ tdls_clear_peer(sm, peer);
+ //os_free(peer);
+}
+
+
+int wpa_tdls_recv_teardown_notify(struct wpa_sm *sm, const u8 *addr,
+ u16 reason_code)
+{
+ struct wpa_tdls_peer *peer = NULL;
+ struct wpa_tdls_ftie *ftie;
+ struct wpa_tdls_lnkid *lnkid;
+ u8 dialogue_token = 0;
+ u8 *rbuf;
+ int ielen;
+
+ /* 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;
+ }
+
+ dialogue_token = peer->dtoken;
+
+ lnkid = (struct wpa_tdls_lnkid *) &peer->lnkid;
+
+ wpa_printf(MSG_DEBUG, "RSN: TDLS Teardown for " MACSTR,
+ MAC2STR(addr));
+
+ /* To add FTIE for Teardown request and compute MIC */
+ ielen = sizeof(*ftie);
+
+ rbuf = os_zalloc(ielen);
+ if (rbuf == NULL)
+ return -1;
+
+ ftie = (struct wpa_tdls_ftie *) rbuf;
+ ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
+ /* Using the recent nonce which should be for CONFIRM frame */
+ os_memcpy(ftie->Anonce, peer->pnonce, 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, "WPA: FTIE for TDLS Teardown handshake",
+ (u8 *) ftie, sizeof(*ftie));
+
+ /* compute MIC before sending */
+ wpa_tdls_key_mic_teardown(peer->tpk.kck, 4, reason_code,
+ dialogue_token, (u8 *) lnkid, (u8 *) ftie,
+ ftie->mic);
+
+ /* 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_smk_send(sm, addr, WLAN_TDLS_TEARDOWN, 0,
+ WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, rbuf, ielen);
+ os_free(rbuf);
+
+ /* clear the Peerkey statemachine */
+ wpa_supplicant_peer_free(sm, peer);
+
+ return 0;
+}
+
+
+static int wpa_tdls_recv_teardown(struct wpa_sm *sm, const u8 *src_addr,
+ const u8 *buf, u16 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 = 0;
+ u8 dialogue_token = 0;
+ 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;
+ }
+
+ if (buf == NULL) {
+ wpa_printf(MSG_INFO, "TDLS: No message delivered for "
+ "wpa_tdls_recv_teardown?!");
+ return -1;
+ }
+
+ pos = buf;
+ pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
+
+ reason_code = WPA_GET_LE16(pos);
+ pos += 2;
+
+ wpa_printf(MSG_INFO, "TDLS: Reason code in Teardown rcode %d",
+ 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.ftie == NULL) {
+ wpa_printf(MSG_INFO, "TDLS: No FTIE in TDLS 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;
+ }
+
+ ftie = (struct wpa_tdls_ftie *) kde.ftie;
+ lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
+ dialogue_token = peer->dtoken; /* used for TDLS handshake */
+
+ wpa_printf(MSG_DEBUG, "RSN: TDLS Teardown Request from " MACSTR,
+ MAC2STR(src_addr));
+
+ /* Process MIC check to see if TDLS Teardown is right */
+ if (wpa_supplicant_verify_tdls_mic_teardown(4, reason_code,
+ dialogue_token, peer,
+ (u8 *) lnkid, ftie) < 0) {
+ wpa_printf(MSG_DEBUG, "RSN: MIC failure for TDLS "
+ "Teardown Request from " MACSTR,
+ MAC2STR(src_addr));
+ //return -1;
+ }
+
+ /*
+ * Request the driver to disable the direct link and clear associated
+ * keys.
+ */
+ wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
+
+ /* clear the Peerkey statemachine */
+ wpa_tdls_peer_free(sm, peer);
+
+ return 0;
+}
+
+
+/**
+ * wpa_tdls_send_smk_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_smk_error(struct wpa_sm *sm, const u8 *dst,
+ u8 tdls_action, u8 dialog_token, u16 status)
+{
+ return wpa_tdls_smk_send(sm, dst, tdls_action, dialog_token, status,
+ NULL, 0);
+}
+
+
+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;
+ u16 kde_len;
+ u32 lifetime = 0;
+ struct wpa_tdls_timeoutie timeoutie;
+ struct wpa_tdls_ftie *ftie;
+
+ /* Peer RSN IE, FTIE(Initiator Nonce, Peer nonce), Lifetime */
+ kde_len = peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
+ sizeof(struct wpa_tdls_timeoutie);
+
+ rbuf = os_zalloc(kde_len);
+ if (rbuf == NULL)
+ return -1;
+ pos = rbuf;
+
+ /* 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->pnonce, WPA_NONCE_LEN);
+ os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
+ ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
+ wpa_hexdump(MSG_WARNING, "WPA: FTIE for SMK M2 handshake",
+ (u8 *) ftie, sizeof(*ftie));
+
+ pos = (u8 *) (ftie + 1);
+
+ /* Lifetime */
+ lifetime = peer->lifetime;
+ pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
+ sizeof(timeoutie), lifetime);
+ wpa_printf(MSG_DEBUG, "RSN: SMK lifetime %u seconds from Responder",
+ lifetime);
+ wpa_hexdump(MSG_WARNING, "WPA: TimeoutIE for SMK M2",
+ (u8 *) &timeoutie, sizeof(timeoutie));
+
+ /* compute MIC before sending */
+ wpa_tdls_ftie_mic(peer->tpk.kck, 2, (u8 *) lnkid, peer->rsnie_p,
+ (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
+
+ wpa_tdls_smk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0,
+ rbuf, kde_len);
+ os_free(rbuf);
+
+ return 0;
+}
+
+
+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;
+ u16 kde_len;
+ struct wpa_tdls_ftie *ftie;
+ struct wpa_tdls_timeoutie timeoutie;
+ u32 lifetime = 0;
+
+ /* Peer RSN IE, FTIE(Initiator Nonce, Peer nonce), Lifetime */
+ kde_len = peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
+ sizeof(struct wpa_tdls_timeoutie);
+
+ rbuf = os_zalloc(kde_len);
+ if (rbuf == NULL)
+ return -1;
+ pos = rbuf;
+
+ /* 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->pnonce, 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);
+
+ /* Lifetime */
+ lifetime = peer->lifetime;
+ pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
+ sizeof(timeoutie), lifetime);
+ wpa_printf(MSG_DEBUG, "RSN: SMK lifetime %u seconds from Responder",
+ lifetime);
+
+ wpa_hexdump(MSG_WARNING, "WPA: TimeoutIE for PTK Handshake M3",
+ (u8 *) &timeoutie, sizeof(timeoutie));
+
+ /* compute MIC before sending */
+ wpa_tdls_ftie_mic(peer->tpk.kck, 3, (u8 *) lnkid, peer->rsnie_p,
+ (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
+
+ wpa_tdls_smk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 0,
+ rbuf, kde_len);
+ os_free(rbuf);
+
+ return 0;
+}
+
+
+static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr,
+ const u8 *buf, u16 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;
+ struct wpa_tdls_timeoutie *timeoutie;
+ struct wpa_tdls_lnkid *lnkid;
+ u32 lifetime = 0;
+ struct os_time now;
+#if 0
+ struct rsn_ie_hdr *hdr;
+ u8 *pos;
+ u16 rsn_capab;
+ u16 rsn_ver;
+#endif
+ u8 dtoken;
+ u16 ielen;
+
+ if (buf == NULL) {
+ wpa_printf(MSG_INFO, "TDLS: No message delivered for "
+ "wpa_tdls_process_tpk_m1?!");
+ return -1;
+ }
+
+ cpos = buf;
+ cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
+
+ /* driver had already verified the frame format */
+ dtoken = *cpos++; /* dialogue token */
+
+ wpa_printf(MSG_INFO, "TDLS: Dialogue Token in TPK M1 %d",
+ dtoken);
+
+ cpos += 2; /* capability information */
+
+ ielen = len - (cpos - buf); /* start of IE in buf */
+ if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0) {
+ wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in TDLS_M1");
+ return -1;
+ }
+
+ if (kde.ftie == NULL) {
+ wpa_printf(MSG_INFO, "RSN: No FTIE in TDLS_M1");
+ return -1;
+ }
+ if (kde.rsn_ie == NULL) {
+ wpa_printf(MSG_INFO, "RSN: No RSN IE in TDLS_M1");
+ return -1;
+ }
+ if (kde.key_lifetime == NULL) {
+ wpa_printf(MSG_INFO, "RSN: No Lifetime IE in TDLS_M1");
+ return -1;
+ }
+ if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
+ wpa_printf(MSG_INFO, "RSN: No Link Identifier IE in TDLS_M1");
+ return -1;
+ }
+
+ ftie = (struct wpa_tdls_ftie *) kde.ftie;
+ timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
+ 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");
+ return -1;
+ }
+
+ wpa_printf(MSG_DEBUG, "RSN: TDLS_M1 - SMK initiator " MACSTR,
+ MAC2STR(src_addr));
+
+ if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
+ wpa_printf(MSG_INFO, "RSN: Too long Initiator RSN IE in "
+ "TDLS_M1");
+ return -1;
+ }
+
+ if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
+ wpa_printf(MSG_INFO, "RSN: Failed to parse RSN IE in TDLS_M1");
+ return -1;
+ }
+
+ cipher = ie.pairwise_cipher;
+ if (cipher & WPA_CIPHER_CCMP) {
+ wpa_printf(MSG_DEBUG, "RSN: Using CCMP for direct link");
+ cipher = WPA_CIPHER_CCMP;
+ } else {
+ wpa_printf(MSG_INFO, "RSN: No acceptable cipher in TDLS_M1");
+ wpa_tdls_send_smk_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE,
+ dtoken,
+ WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID);
+ return -1;
+ }
+
+ /* Find existing entry and if found, use that instead of adding
+ * a new one; how to handle the case where both ends initiate at the
+ * same time? */
+ 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, "RSN: No matching entry found for "
+ "Initiator, creating one. " MACSTR,
+ MAC2STR(src_addr));
+ peer = os_malloc(sizeof(*peer));
+ if (peer == NULL)
+ return -1;
+ os_memset(peer, 0, sizeof(*peer));
+ os_memcpy(peer->addr, src_addr, ETH_ALEN);
+ peer->next = sm->tdls;
+ sm->tdls = peer;
+ } else {
+ /*
+ * An entry is already present, so check if a TPK_M1 Request
+ * had been sent.
+ * If so compare MAC address and let
+ * - greater MAC continue to be initiator
+ * - other MAC be Peer and process the Req.
+ */
+ if (peer->initiator) {
+ if (os_memcmp(sm->own_addr, src_addr, ETH_ALEN) > 0) {
+ wpa_printf(MSG_DEBUG, "TDLS: Dropping Request "
+ "from peer with smaller address "
+ MACSTR, MAC2STR(src_addr));
+ return -1;
+ } else {
+ /*
+ * If smaller node then accept the packet,
+ * clear values and get ready to process this
+ * Req.
+ */
+ wpa_printf(MSG_DEBUG, "TDLS: Accepting "
+ "Request from peer " MACSTR,
+ MAC2STR(src_addr));
+ /* clear sm info and preserve the list */
+ wpa_supplicant_peer_free(sm, peer);
+ }
+ }
+ }
+
+ peer->initiator = 0; /* Need to check */
+ peer->dtoken = dtoken;
+ os_memcpy(peer->lnkid, (u8 *) lnkid, sizeof(struct wpa_tdls_lnkid));
+ os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN);
+ 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_get_random(peer->pnonce, WPA_NONCE_LEN)) {
+ wpa_msg(sm->ctx->ctx, MSG_WARNING,
+ "WPA: Failed to get random data for PNonce");
+ wpa_tdls_peer_free(sm, peer);
+ return -1;
+ }
+
+#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 PTK handshake",
+ peer->rsnie_p, peer->rsnie_p_len);
+
+ /* Lifetime */
+ lifetime = WPA_GET_LE32(timeoutie->value);
+ wpa_printf(MSG_DEBUG, "RSN: SMK lifetime %u seconds", lifetime);
+ if (lifetime < 300)
+ lifetime = 300; /* minimum seconds */
+ peer->lifetime = lifetime;
+
+ /* SMK Lifetime Expiry */
+ os_get_time(&now);
+ peer->expiration = now.sec + peer->lifetime;
+ /*eloop_register_timeout(lifetime, 0, wpa_tdls_smk_timeout,
+ sm, peer);*/
+
+ /* generate SMK using Nonce */
+ wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
+
+ wpa_printf(MSG_DEBUG, "TDLS: Sending TPK Handshake Message 2");
+ wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer);
+
+ return 0;
+}
+
+
+static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
+ const u8 *buf, u16 len)
+{
+ struct wpa_tdls_peer *peer;
+ struct wpa_eapol_ie_parse kde;
+ struct wpa_ie_data ie;
+ int cipher;
+ struct os_time now;
+ struct wpa_tdls_ftie *ftie;
+ struct wpa_tdls_timeoutie *timeoutie;
+ struct wpa_tdls_lnkid *lnkid;
+ u32 lifetime = 0;
+ u8 dtoken = 0;
+ int ielen;
+ u16 status;
+ const u8 *pos;
+
+ if (buf == NULL) {
+ wpa_printf(MSG_INFO, "TDLS: No message delivered for "
+ "wpa_tdls_process_tpk_m2?!");
+ return -1;
+ }
+
+ pos = buf;
+ pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
+ status = WPA_GET_LE16(pos);
+ pos += 2 /* status code */;
+
+ if (status != 0) {
+ wpa_printf(MSG_INFO, "TDLS: status in TPK M2 %d", status);
+ /* TODO: Respond appropriately to status_code.
+ * (e.g.)
+ * if (status_code == 44)
+ * then rectify RSNIE in M1 and resend
+ * else if (status_code == XXX)
+ * then do XXX
+ */
+ return -1;
+ }
+
+ /* driver had already verified the frame format */
+ dtoken = *pos++; /* dialogue token */
+
+ wpa_printf(MSG_INFO, "TDLS: Dialogue Token in TPK M2 %d",
+ dtoken);
+
+ pos += 2; /* capability information */
+
+ ielen = len - (pos - buf); /* start of IE in buf */
+ if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0) {
+ wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in TDLS_M2");
+ return -1;
+ }
+
+ if (kde.ftie == NULL) {
+ wpa_printf(MSG_INFO, "RSN: No FTIE in TDLS_M2");
+ return -1;
+ }
+ if (kde.rsn_ie == NULL) {
+ wpa_printf(MSG_INFO, "RSN: No RSN IE KDE in TDLS_M2");
+ return -1;
+ }
+ if (kde.key_lifetime == NULL) {
+ wpa_printf(MSG_INFO, "RSN: No Lifetime IE in TDLS_M2");
+ return -1;
+ }
+ if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
+ wpa_printf(MSG_INFO, "RSN: No Link Identifier IE in TDLS_M2");
+ return -1;
+ }
+
+ ftie = (struct wpa_tdls_ftie *) kde.ftie;
+ timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
+ 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 diff BSS");
+ return -1;
+ }
+
+ wpa_printf(MSG_DEBUG, "RSN: SMK M2 - SMK Peer " MACSTR,
+ MAC2STR(src_addr));
+
+ if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
+ wpa_printf(MSG_INFO, "RSN: Too long Initiator RSN IE in TDLS_"
+ "M2");
+ return -1;
+ }
+
+ if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
+ wpa_printf(MSG_INFO, "RSN: Failed to parse RSN IE in SMK M2");
+ return -1;
+ }
+
+ cipher = ie.pairwise_cipher;
+ if (cipher & WPA_CIPHER_CCMP) {
+ wpa_printf(MSG_DEBUG, "RSN: Using CCMP for direct link");
+ cipher = WPA_CIPHER_CCMP;
+ } else {
+ wpa_printf(MSG_INFO, "RSN: No acceptable cipher in TDLS_M2");
+ wpa_tdls_send_smk_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM,
+ dtoken,
+ WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID);
+ return -1;
+ }
+
+ for (peer = sm->tdls; peer; peer = peer->next) {
+ if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
+ /* && os_memcmp(peer->inonce, kde.nonce,
+ WPA_NONCE_LEN) == 0) */
+ break;
+ }
+ if (peer == NULL) {
+ wpa_printf(MSG_INFO, "TDLS: No matching peer found for PTK "
+ "Handshake Message 3: " MACSTR, MAC2STR(src_addr));
+ return -1;
+ } else {
+ wpa_tdls_smkretry_timeout_cancel(sm, peer,
+ WLAN_TDLS_SETUP_REQUEST);
+ }
+
+ if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
+ wpa_printf(MSG_INFO, "RSN: Key Nonce in TDLS_M2 does "
+ "not match with INonce used in TDLS_M1");
+ return -1;
+ }
+
+ if (!os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) == 0) {
+ wpa_printf(MSG_INFO, "TDLS: RSNIE in TPK M2 does "
+ "not match with RSNIE used in TPK M1");
+ wpa_hexdump(MSG_DEBUG, "TDLS: RSNIE Sent in TPK M1",
+ peer->rsnie_i, peer->rsnie_i_len);
+ wpa_hexdump(MSG_DEBUG, "TDLS: RSNIE Received from TPK M2",
+ kde.rsn_ie, kde.rsn_ie_len);
+ wpa_tdls_send_smk_error(
+ sm, src_addr,
+ WLAN_TDLS_SETUP_CONFIRM, dtoken,
+ WLAN_STATUS_UNSUPPORTED_RSN_IE_VERSION);
+
+ return -1;
+ }
+
+ wpa_hexdump(MSG_DEBUG, "RSN: FTIE Received from SMK M2",
+ (u8 *) ftie, sizeof(*ftie));
+ wpa_hexdump(MSG_DEBUG, "RSN: Timeout IE Received from SMK M2",
+ (u8 *) timeoutie, sizeof(*timeoutie));
+ wpa_hexdump(MSG_DEBUG, "RSN: RSNIE Received from SMK M2",
+ kde.rsn_ie, kde.rsn_ie_len);
+ wpa_hexdump(MSG_DEBUG, "RSN: Link ID Received from SMK M2",
+ (u8 *) lnkid, kde.lnkid_len);
+
+ /* P-Nonce and RSN_IE */
+ peer->dtoken = dtoken;
+ os_memcpy(peer->lnkid, (u8 *) lnkid, sizeof(struct wpa_tdls_lnkid));
+ os_memcpy(peer->pnonce, 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 */
+ lifetime = WPA_GET_LE32(timeoutie->value);
+ wpa_printf(MSG_DEBUG, "RSN: SMK lifetime %u seconds", lifetime);
+ if (lifetime < 300)
+ lifetime = 300; /* minimum seconds */
+ peer->lifetime = lifetime;
+ os_get_time(&now);
+ peer->expiration = now.sec + lifetime;
+ /*eloop_register_timeout(lifetime, 0, wpa_tdls_smk_timeout,
+ sm, peer);*/
+
+ /* generate SMK using Nonce */
+ wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
+
+ /* Process MIC check to see if TDLS_M2 is right */
+ if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid,
+ (u8 *) timeoutie, ftie) < 0) {
+ wpa_tdls_del_key(sm, peer);
+ wpa_tdls_peer_free(sm, peer);
+ return -1;
+ }
+
+ wpa_tdls_set_key(sm, peer);
+
+ wpa_printf(MSG_DEBUG, "TDLS: Sending TPK Handshake Message 3");
+ wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer);
+
+ wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, src_addr);
+
+ return 0;
+}
+
+
+static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr,
+ const u8 *buf, u16 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;
+
+ if (buf == NULL) {
+ wpa_printf(MSG_INFO, "TDLS: No message delivered for "
+ "wpa_tdls_process_tpk_m3?!");
+ return -1;
+ }
+
+ pos = buf;
+ pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
+
+ status = WPA_GET_LE16(pos);
+
+ if (status != 0) {
+ wpa_printf(MSG_INFO, "TDLS: status in TPK M3 %d", status);
+ /* TODO: Respond appropriately to status_code
+ * (e.g.)
+ * if (status_code == 44)
+ * then rectify RSNIE in M1 and resend M1
+ * else if (status_code == XXX)
+ * then do XXX
+ */
+ return -1;
+ }
+ pos += 2 /* status code */ + 1 /* dialogue token */;
+
+ 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 KDEs in TPK "
+ "Handshake Message 3");
+ return -1;
+ }
+
+ if (kde.ftie == NULL) {
+ wpa_printf(MSG_INFO, "RSN: No FTIE in TDLS_M3");
+ return -1;
+ }
+ if (kde.rsn_ie == NULL) {
+ wpa_printf(MSG_INFO, "RSN: No RSN IE KDE in TDLS_M3");
+ return -1;
+ }
+ if (kde.key_lifetime == NULL) {
+ wpa_printf(MSG_INFO, "RSN: No Lifetime IE in TDLS_M3");
+ return -1;
+ }
+ if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
+ wpa_printf(MSG_INFO, "RSN: No Link Identifier IE in TDLS_M3");
+ return -1;
+ }
+
+ ftie = (struct wpa_tdls_ftie *) kde.ftie;
+ timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
+ 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");
+ return -1;
+ }
+
+ wpa_printf(MSG_DEBUG, "RSN: Received TDLS_M3 (Peer "
+ MACSTR ")", MAC2STR(src_addr));
+
+ wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M3",
+ (u8 *) ftie, sizeof(*ftie));
+ wpa_hexdump(MSG_DEBUG, "TDLS: Timeout IE Received from TPK M3",
+ (u8 *) timeoutie, sizeof(*timeoutie));
+ wpa_hexdump(MSG_DEBUG, "TDLS: RSNIE Received from TPK M3",
+ kde.rsn_ie, kde.rsn_ie_len);
+ wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M3",
+ (u8 *) lnkid, sizeof(*lnkid));
+
+ 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 TDLS peer found "
+ "for TPK Handshake Message 3: " MACSTR,
+ MAC2STR(src_addr));
+ return -1;
+ } else
+ wpa_tdls_smkretry_timeout_cancel(sm, peer,
+ WLAN_TDLS_SETUP_RESPONSE);
+
+ if (!os_memcmp(peer->pnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) {
+ wpa_printf(MSG_INFO, "RSN: PNonce in TDLS_M3 does "
+ "not match with PNonce used in TDLS_M2");
+ return -1;
+ }
+
+ if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
+ wpa_printf(MSG_INFO, "RSN: INonce in TDLS_M3 did not "
+ "match with the one received in TDLS_M1");
+ return -1;
+ }
+
+ if (wpa_supplicant_verify_tdls_mic(3, peer, (u8 *) lnkid,
+ (u8 *) timeoutie, ftie) < 0) {
+ wpa_tdls_del_key(sm, peer);
+ wpa_tdls_peer_free(sm, peer);
+ return -1;
+ }
+
+ if (wpa_tdls_set_key(sm, peer) < 0)
+ return -1;
+
+ wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, src_addr);
+
+ return 0;
+}
+
+
+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); /* dot11RSNAConfigSMKLifetime */
+ 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)
+{
+ u16 kde_len; /* TDLS TPK Messages are around 400 bytes */
+ struct wpa_tdls_ftie *ftie;
+ u8 *rbuf, *pos, *count_pos;
+ u16 count;
+ struct rsn_ie_hdr *hdr;
+ struct wpa_tdls_peer *peer;
+ struct wpa_tdls_timeoutie timeoutie;
+ u32 lifetime = 0;
+ u16 rsn_capab;
+
+ /* Find existing entry and if found, use that instead of adding
+ * a new one */
+ 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, "RSN: No matching entry found for "
+ "peer, creating one. " MACSTR, MAC2STR(addr));
+ peer = os_malloc(sizeof(*peer));
+ if (peer == NULL)
+ return -1;
+ os_memset(peer, 0, sizeof(*peer));
+ os_memcpy(peer->addr, addr, ETH_ALEN);
+ peer->next = sm->tdls;
+ sm->tdls = peer;
+ }
+
+ peer->initiator = 1;
+
+ /*
+ * TPK Handshake Message 1:
+ * FTIE: ANonce=0, SNonce=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;
+ WPA_PUT_LE16(pos, rsn_capab);
+ pos += 2;
+
+ 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);
+
+ kde_len = peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
+ sizeof(struct wpa_tdls_timeoutie);
+ rbuf = os_zalloc(kde_len);
+ if (rbuf == NULL) {
+ wpa_supplicant_peer_free(sm, peer);
+ return -1;
+ }
+ pos = rbuf;
+
+ /* 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,
+ "WPA: Failed to get random data for INonce");
+ os_free(rbuf);
+ wpa_supplicant_peer_free(sm, peer);
+ return -1;
+ }
+ os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
+ wpa_hexdump(MSG_DEBUG, "TDLS: INonce for TPK handshake",
+ ftie->Snonce, WPA_NONCE_LEN);
+
+ wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK Handshake M1",
+ (u8 *) ftie, sizeof(struct wpa_tdls_ftie));
+
+ pos = (u8 *) (ftie + 1);
+
+ /* Lifetime */
+ lifetime = 43200; /* 12 hrs */
+ pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
+ sizeof(timeoutie), lifetime);
+ wpa_hexdump(MSG_WARNING, "WPA: TimeoutIE for TPK Handshake M1",
+ (u8 *) &timeoutie, sizeof(timeoutie));
+ peer->lifetime = lifetime;
+ wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime);
+
+ wpa_printf(MSG_DEBUG, "TDLS: Sending TPK Handshake Message 1 (peer "
+ MACSTR ")", MAC2STR(addr));
+
+ wpa_tdls_smk_send(sm, addr, WLAN_TDLS_SETUP_REQUEST, 0, 0,
+ rbuf, kde_len);
+ os_free(rbuf);
+
+ return 0;
+}
+
+
+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;
+}
+
+
+/**
+ * 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_printf(MSG_DEBUG, "Received TDLS Packet");
+
+ if (!wpa_tdls_get_privacy(sm)) {
+ wpa_printf(MSG_INFO, "TDLS: %s: In open mode, so discard",
+ __func__);
+ return;
+ }
+
+ if (os_memcmp(src_addr, sm->own_addr, ETH_ALEN) == 0) {
+ wpa_printf(MSG_DEBUG, "TDLS: Discard copy of own message");
+ return;
+ }
+
+ tf = (struct wpa_tdls_frame *) buf;
+
+ /* Check to make sure its a valid setup request */
+ if (tf->payloadtype != 2 /* TDLS_RFTYPE */) {
+ wpa_printf(MSG_INFO, "TDLS: Invalid payloadtype: %x, "
+ "action:%x", tf->payloadtype, TDLS_FRAME_TYPE(tf));
+ return;
+ }
+
+ if (!len) {
+ wpa_printf(MSG_INFO, "%s cannot process a frame of 0 len",
+ __func__);
+ return;
+ }
+
+ wpa_hexdump(MSG_DEBUG, "TDLS: l2_packet Received frame", buf, len);
+
+ if (TDLS_FRAME_TYPE(tf) == WLAN_TDLS_SETUP_REQUEST)
+ wpa_tdls_process_tpk_m1(sm, src_addr, buf, len);
+ else if (TDLS_FRAME_TYPE(tf) == WLAN_TDLS_SETUP_RESPONSE)
+ wpa_tdls_process_tpk_m2(sm, src_addr, buf, len);
+ else if (TDLS_FRAME_TYPE(tf) == WLAN_TDLS_SETUP_CONFIRM)
+ wpa_tdls_process_tpk_m3(sm, src_addr, buf, len);
+ else if (TDLS_FRAME_TYPE(tf) == WLAN_TDLS_TEARDOWN)
+ wpa_tdls_recv_teardown(sm, src_addr, buf, len);
+}
+
+
+/**
+ * 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->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;
+ }
+
+ return 0;
+}
+
+
+/**
+ * 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)
+{
+ struct wpa_tdls_peer *peer;
+
+ if (sm == NULL)
+ return;
+
+ if (sm->l2_tdls)
+ l2_packet_deinit(sm->l2_tdls);
+ sm->l2_tdls = NULL;
+
+ peer = sm->tdls;
+ while (peer) {
+ struct wpa_tdls_peer *tmp;
+ tmp = peer->next;
+ /* clear tdls sm */
+ wpa_supplicant_peer_free(sm, peer);
+ os_free(peer);
+ peer = tmp;
+ }
+ sm->tdls = NULL;
+}
projects / mech_eap.git / commitdiff