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hostap/src/rsn_supp/tdls.c
Jouni Malinen de61795e7c TDLS: Use merge_byte_arrays() helper 
This makes implementation simpler and easier for static analyzers to
understand.

Signed-hostap: Jouni Malinen <j@w1.fi>
2013-01-12 17:51:53 +02:00

2323 lines
62 KiB
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/*
* 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)
unsigned int tdls_testing = 0;
#endif /* CONFIG_TDLS_TESTING */
#define TPK_LIFETIME 43200 /* 12 hours */
#define TPK_RETRY_COUNT 3
#define TPK_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]; /* 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);
#define TDLS_MAX_IE_LEN 80
#define IEEE80211_MAX_SUPP_RATES 32
struct wpa_tdls_peer {
struct wpa_tdls_peer *next;
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;
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;
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;
};
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, 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_tpk_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: TPK 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 ||
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);
peer->sm_tmr.count = TPK_RETRY_COUNT;
peer->sm_tmr.timer = TPK_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.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_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 free_peer)
{
int ret;
if (sm->tdls_external_setup) {
ret = wpa_tdls_send_teardown(sm, peer->addr, reason_code);
/* disable the link after teardown was sent */
wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
} else {
ret = wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr);
}
if (sm->tdls_external_setup || free_peer)
wpa_tdls_peer_free(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--;
peer->sm_tmr.timer = TPK_TIMEOUT;
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.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, 0,
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, 1);
}
}
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(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_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, 1);
}
}
static void wpa_tdls_peer_free(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->initiator = 0;
os_free(peer->sm_tmr.buf);
peer->sm_tmr.buf = NULL;
peer->rsnie_i_len = peer->rsnie_p_len = 0;
peer->cipher = 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_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);
}
}
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,
WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, rbuf,
pos - rbuf);
os_free(rbuf);
/* clear the Peerkey statemachine */
wpa_tdls_peer_free(sm, peer);
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, 0);
}
void wpa_tdls_disable_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) {
wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, addr);
wpa_tdls_peer_free(sm, peer);
}
}
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_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
/* clear the Peerkey statemachine */
wpa_tdls_peer_free(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,
NULL, 0);
}
static struct wpa_tdls_peer *
wpa_tdls_add_peer(struct wpa_sm *sm, const u8 *addr)
{
struct wpa_tdls_peer *peer;
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;
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));
wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_SETUP_REQUEST, 1, 0,
rbuf, pos - rbuf);
os_free(rbuf);
return 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;
size_t buf_len;
u32 lifetime;
struct wpa_tdls_timeoutie timeoutie;
struct wpa_tdls_ftie *ftie;
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);
skip_ies:
wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0,
rbuf, pos - rbuf);
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;
size_t buf_len;
struct wpa_tdls_ftie *ftie;
struct wpa_tdls_timeoutie timeoutie;
u32 lifetime;
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);
skip_ies:
wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 0,
rbuf, pos - rbuf);
os_free(rbuf);
return 0;
}
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, 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)];
if (wpa_supplicant_parse_ies(buf + sizeof(struct wpa_tdls_frame) + 1,
len - (sizeof(struct wpa_tdls_frame) + 1),
&kde) < 0)
return -1;
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);
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, 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 + 2, kde->ext_supp_rates_len - 2);
return 0;
}
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);
for (peer = sm->tdls; peer; peer = peer->next) {
if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) {
existing_peer = 1;
break;
}
}
if (peer == NULL) {
peer = wpa_tdls_add_peer(sm, src_addr);
if (peer == NULL)
goto error;
}
/* 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;
#ifdef CONFIG_TDLS_TESTING
if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
for (peer = sm->tdls; peer; peer = peer->next) {
if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
break;
}
if (peer == NULL) {
peer = wpa_tdls_add_peer(sm, src_addr);
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:
/* 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");
#if 0
/* TODO: Disabling the link would be more proper
* operation here, but it seems to trigger a race with
* some drivers handling the new request frame. */
wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
#else
if (sm->tdls_external_setup)
wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK,
src_addr);
else
wpa_tdls_del_key(sm, peer);
#endif
wpa_tdls_peer_free(sm, peer);
}
/*
* 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 (peer->initiator) {
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_tdls_peer_free(sm, peer);
}
}
}
#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->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->rnonce, WPA_NONCE_LEN)) {
wpa_msg(sm->ctx->ctx, MSG_WARNING,
"TDLS: Failed to get random data for responder nonce");
wpa_tdls_peer_free(sm, peer);
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 the peer to the driver as a "setup in progress" peer */
wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, NULL, 0);
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_tdls_disable_link(sm, peer->addr);
goto error;
}
return 0;
error:
wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken,
status);
return -1;
}
static void wpa_tdls_enable_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
{
peer->tpk_success = 1;
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 */
}
/* add supported rates and capabilities to the TDLS peer */
wpa_sm_tdls_peer_addset(sm, peer->addr, 0, peer->capability,
peer->supp_rates, peer->supp_rates_len);
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;
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;
}
wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_REQUEST);
if (len < 3 + 2 + 1)
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);
if (sm->tdls_external_setup)
wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
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)
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 (!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);
/*
* 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_peer_free(sm, peer);
if (sm->tdls_external_setup)
wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
return -1;
}
wpa_tdls_set_key(sm, peer);
skip_rsn:
peer->dtoken = dtoken;
wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Confirm / "
"TPK Handshake Message 3");
wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer);
wpa_tdls_enable_link(sm, peer);
return 0;
error:
wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken,
status);
if (sm->tdls_external_setup)
wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
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;
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)
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 code in TPK M3: %u",
status);
if (sm->tdls_external_setup)
wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
return -1;
}
pos += 2 /* status code */ + 1 /* dialog 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 M3");
return -1;
}
if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M3");
return -1;
}
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");
return -1;
}
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");
return -1;
}
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");
return -1;
}
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");
return -1;
}
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");
return -1;
}
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");
return -1;
}
if (kde.key_lifetime == NULL) {
wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M3");
return -1;
}
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);
if (sm->tdls_external_setup)
wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
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;
skip_rsn:
wpa_tdls_enable_link(sm, peer);
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);
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;
}
/* 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) {
peer = wpa_tdls_add_peer(sm, addr);
if (peer == NULL)
return -1;
}
peer->initiator = 1;
/* add the peer to the driver as a "setup in progress" peer */
wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, NULL, 0);
if (wpa_tdls_send_tpk_m1(sm, peer) < 0) {
wpa_tdls_disable_link(sm, peer->addr);
return -1;
}
return 0;
}
int wpa_tdls_reneg(struct wpa_sm *sm, const u8 *addr)
{
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 || !peer->tpk_success)
return -1;
if (sm->tdls_external_setup) {
/*
* Disable previous link to allow renegotiation to be completed
* on AP path.
*/
wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
}
return wpa_tdls_start(sm, addr);
}
/**
* 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;
}
static void wpa_tdls_remove_peers(struct wpa_sm *sm)
{
struct wpa_tdls_peer *peer, *tmp;
peer = sm->tdls;
sm->tdls = NULL;
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);
os_free(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;
}
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