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Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001/*
2 * wpa_supplicant - TDLS
3 * Copyright (c) 2010-2011, Atheros Communications
4 *
Dmitry Shmidtc5ec7f52012-03-06 16:33:24 -08005 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07007 */
8
9#include "utils/includes.h"
10
11#include "utils/common.h"
12#include "utils/eloop.h"
13#include "utils/os.h"
14#include "common/ieee802_11_defs.h"
15#include "crypto/sha256.h"
16#include "crypto/crypto.h"
17#include "crypto/aes_wrap.h"
18#include "rsn_supp/wpa.h"
19#include "rsn_supp/wpa_ie.h"
20#include "rsn_supp/wpa_i.h"
21#include "drivers/driver.h"
22#include "l2_packet/l2_packet.h"
23
24#ifdef CONFIG_TDLS_TESTING
25#define TDLS_TESTING_LONG_FRAME BIT(0)
26#define TDLS_TESTING_ALT_RSN_IE BIT(1)
27#define TDLS_TESTING_DIFF_BSSID BIT(2)
28#define TDLS_TESTING_SHORT_LIFETIME BIT(3)
29#define TDLS_TESTING_WRONG_LIFETIME_RESP BIT(4)
30#define TDLS_TESTING_WRONG_LIFETIME_CONF BIT(5)
31#define TDLS_TESTING_LONG_LIFETIME BIT(6)
32#define TDLS_TESTING_CONCURRENT_INIT BIT(7)
33#define TDLS_TESTING_NO_TPK_EXPIRATION BIT(8)
34#define TDLS_TESTING_DECLINE_RESP BIT(9)
35#define TDLS_TESTING_IGNORE_AP_PROHIBIT BIT(10)
36unsigned int tdls_testing = 0;
37#endif /* CONFIG_TDLS_TESTING */
38
39#define TPK_LIFETIME 43200 /* 12 hours */
Dmitry Shmidtf7e0a992013-05-23 11:03:10 -070040#define TPK_M1_RETRY_COUNT 3
41#define TPK_M1_TIMEOUT 5000 /* in milliseconds */
42#define TPK_M2_RETRY_COUNT 10
43#define TPK_M2_TIMEOUT 500 /* in milliseconds */
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -070044
45#define TDLS_MIC_LEN 16
46
47#define TDLS_TIMEOUT_LEN 4
48
49struct wpa_tdls_ftie {
50 u8 ie_type; /* FTIE */
51 u8 ie_len;
52 u8 mic_ctrl[2];
53 u8 mic[TDLS_MIC_LEN];
54 u8 Anonce[WPA_NONCE_LEN]; /* Responder Nonce in TDLS */
55 u8 Snonce[WPA_NONCE_LEN]; /* Initiator Nonce in TDLS */
56 /* followed by optional elements */
57} STRUCT_PACKED;
58
59struct wpa_tdls_timeoutie {
60 u8 ie_type; /* Timeout IE */
61 u8 ie_len;
62 u8 interval_type;
63 u8 value[TDLS_TIMEOUT_LEN];
64} STRUCT_PACKED;
65
66struct wpa_tdls_lnkid {
67 u8 ie_type; /* Link Identifier IE */
68 u8 ie_len;
69 u8 bssid[ETH_ALEN];
70 u8 init_sta[ETH_ALEN];
71 u8 resp_sta[ETH_ALEN];
72} STRUCT_PACKED;
73
74/* TDLS frame headers as per IEEE Std 802.11z-2010 */
75struct wpa_tdls_frame {
76 u8 payloadtype; /* IEEE80211_TDLS_RFTYPE */
77 u8 category; /* Category */
78 u8 action; /* Action (enum tdls_frame_type) */
79} STRUCT_PACKED;
80
81static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs);
82static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx);
83static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer);
84
85
86#define TDLS_MAX_IE_LEN 80
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -080087#define IEEE80211_MAX_SUPP_RATES 32
88
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -070089struct wpa_tdls_peer {
90 struct wpa_tdls_peer *next;
Dmitry Shmidt8da800a2013-04-24 12:57:01 -070091 unsigned int reconfig_key:1;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -070092 int initiator; /* whether this end was initiator for TDLS setup */
93 u8 addr[ETH_ALEN]; /* other end MAC address */
94 u8 inonce[WPA_NONCE_LEN]; /* Initiator Nonce */
95 u8 rnonce[WPA_NONCE_LEN]; /* Responder Nonce */
96 u8 rsnie_i[TDLS_MAX_IE_LEN]; /* Initiator RSN IE */
97 size_t rsnie_i_len;
98 u8 rsnie_p[TDLS_MAX_IE_LEN]; /* Peer RSN IE */
99 size_t rsnie_p_len;
100 u32 lifetime;
101 int cipher; /* Selected cipher (WPA_CIPHER_*) */
102 u8 dtoken;
103
104 struct tpk {
105 u8 kck[16]; /* TPK-KCK */
106 u8 tk[16]; /* TPK-TK; assuming only CCMP will be used */
107 } tpk;
108 int tpk_set;
109 int tpk_success;
110
111 struct tpk_timer {
112 u8 dest[ETH_ALEN];
113 int count; /* Retry Count */
114 int timer; /* Timeout in milliseconds */
115 u8 action_code; /* TDLS frame type */
116 u8 dialog_token;
117 u16 status_code;
118 int buf_len; /* length of TPK message for retransmission */
119 u8 *buf; /* buffer for TPK message */
120 } sm_tmr;
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800121
122 u16 capability;
123
124 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
125 size_t supp_rates_len;
Dmitry Shmidtf8623282013-02-20 14:34:59 -0800126
127 struct ieee80211_ht_capabilities *ht_capabilities;
Dmitry Shmidt33e38bf2013-02-27 12:56:00 -0800128 struct ieee80211_vht_capabilities *vht_capabilities;
Dmitry Shmidtf8623282013-02-20 14:34:59 -0800129
130 u8 qos_info;
131
Dmitry Shmidt51b6ea82013-05-08 10:42:09 -0700132 u16 aid;
133
Dmitry Shmidtf8623282013-02-20 14:34:59 -0800134 u8 *ext_capab;
135 size_t ext_capab_len;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700136};
137
138
139static int wpa_tdls_get_privacy(struct wpa_sm *sm)
140{
141 /*
142 * Get info needed from supplicant to check if the current BSS supports
143 * security. Other than OPEN mode, rest are considered secured
144 * WEP/WPA/WPA2 hence TDLS frames are processed for TPK handshake.
145 */
146 return sm->pairwise_cipher != WPA_CIPHER_NONE;
147}
148
149
150static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len)
151{
152 os_memcpy(pos, ie, ie_len);
153 return pos + ie_len;
154}
155
156
157static int wpa_tdls_del_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
158{
159 if (wpa_sm_set_key(sm, WPA_ALG_NONE, peer->addr,
160 0, 0, NULL, 0, NULL, 0) < 0) {
161 wpa_printf(MSG_WARNING, "TDLS: Failed to delete TPK-TK from "
162 "the driver");
163 return -1;
164 }
165
166 return 0;
167}
168
169
170static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
171{
172 u8 key_len;
173 u8 rsc[6];
174 enum wpa_alg alg;
175
176 os_memset(rsc, 0, 6);
177
178 switch (peer->cipher) {
179 case WPA_CIPHER_CCMP:
180 alg = WPA_ALG_CCMP;
181 key_len = 16;
182 break;
183 case WPA_CIPHER_NONE:
184 wpa_printf(MSG_DEBUG, "TDLS: Pairwise Cipher Suite: "
185 "NONE - do not use pairwise keys");
186 return -1;
187 default:
188 wpa_printf(MSG_WARNING, "TDLS: Unsupported pairwise cipher %d",
189 sm->pairwise_cipher);
190 return -1;
191 }
192
193 if (wpa_sm_set_key(sm, alg, peer->addr, -1, 1,
194 rsc, sizeof(rsc), peer->tpk.tk, key_len) < 0) {
195 wpa_printf(MSG_WARNING, "TDLS: Failed to set TPK to the "
196 "driver");
197 return -1;
198 }
199 return 0;
200}
201
202
203static int wpa_tdls_send_tpk_msg(struct wpa_sm *sm, const u8 *dst,
204 u8 action_code, u8 dialog_token,
205 u16 status_code, const u8 *buf, size_t len)
206{
207 return wpa_sm_send_tdls_mgmt(sm, dst, action_code, dialog_token,
208 status_code, buf, len);
209}
210
211
212static int wpa_tdls_tpk_send(struct wpa_sm *sm, const u8 *dest, u8 action_code,
213 u8 dialog_token, u16 status_code,
214 const u8 *msg, size_t msg_len)
215{
216 struct wpa_tdls_peer *peer;
217
218 wpa_printf(MSG_DEBUG, "TDLS: TPK send dest=" MACSTR " action_code=%u "
219 "dialog_token=%u status_code=%u msg_len=%u",
220 MAC2STR(dest), action_code, dialog_token, status_code,
221 (unsigned int) msg_len);
222
223 if (wpa_tdls_send_tpk_msg(sm, dest, action_code, dialog_token,
224 status_code, msg, msg_len)) {
225 wpa_printf(MSG_INFO, "TDLS: Failed to send message "
226 "(action_code=%u)", action_code);
227 return -1;
228 }
229
230 if (action_code == WLAN_TDLS_SETUP_CONFIRM ||
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800231 action_code == WLAN_TDLS_TEARDOWN ||
232 action_code == WLAN_TDLS_DISCOVERY_REQUEST ||
233 action_code == WLAN_TDLS_DISCOVERY_RESPONSE)
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700234 return 0; /* No retries */
235
236 for (peer = sm->tdls; peer; peer = peer->next) {
237 if (os_memcmp(peer->addr, dest, ETH_ALEN) == 0)
238 break;
239 }
240
241 if (peer == NULL) {
242 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
243 "retry " MACSTR, MAC2STR(dest));
244 return 0;
245 }
246
247 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
248
Dmitry Shmidtf7e0a992013-05-23 11:03:10 -0700249 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
250 peer->sm_tmr.count = TPK_M2_RETRY_COUNT;
251 peer->sm_tmr.timer = TPK_M2_TIMEOUT;
252 } else {
253 peer->sm_tmr.count = TPK_M1_RETRY_COUNT;
254 peer->sm_tmr.timer = TPK_M1_TIMEOUT;
255 }
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700256
257 /* Copy message to resend on timeout */
258 os_memcpy(peer->sm_tmr.dest, dest, ETH_ALEN);
259 peer->sm_tmr.action_code = action_code;
260 peer->sm_tmr.dialog_token = dialog_token;
261 peer->sm_tmr.status_code = status_code;
262 peer->sm_tmr.buf_len = msg_len;
263 os_free(peer->sm_tmr.buf);
264 peer->sm_tmr.buf = os_malloc(msg_len);
265 if (peer->sm_tmr.buf == NULL)
266 return -1;
267 os_memcpy(peer->sm_tmr.buf, msg, msg_len);
268
269 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout registered "
270 "(action_code=%u)", action_code);
Dmitry Shmidtf7e0a992013-05-23 11:03:10 -0700271 eloop_register_timeout(peer->sm_tmr.timer / 1000,
272 (peer->sm_tmr.timer % 1000) * 1000,
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700273 wpa_tdls_tpk_retry_timeout, sm, peer);
274 return 0;
275}
276
277
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800278static int wpa_tdls_do_teardown(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
279 u16 reason_code, int free_peer)
280{
281 int ret;
282
283 if (sm->tdls_external_setup) {
284 ret = wpa_tdls_send_teardown(sm, peer->addr, reason_code);
285
286 /* disable the link after teardown was sent */
287 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
288 } else {
289 ret = wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr);
290 }
291
292 if (sm->tdls_external_setup || free_peer)
293 wpa_tdls_peer_free(sm, peer);
294
295 return ret;
296}
297
298
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700299static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx)
300{
301
302 struct wpa_sm *sm = eloop_ctx;
303 struct wpa_tdls_peer *peer = timeout_ctx;
304
305 if (peer->sm_tmr.count) {
306 peer->sm_tmr.count--;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700307
308 wpa_printf(MSG_INFO, "TDLS: Retrying sending of message "
309 "(action_code=%u)",
310 peer->sm_tmr.action_code);
311
312 if (peer->sm_tmr.buf == NULL) {
313 wpa_printf(MSG_INFO, "TDLS: No retry buffer available "
314 "for action_code=%u",
315 peer->sm_tmr.action_code);
316 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm,
317 peer);
318 return;
319 }
320
321 /* resend TPK Handshake Message to Peer */
322 if (wpa_tdls_send_tpk_msg(sm, peer->sm_tmr.dest,
323 peer->sm_tmr.action_code,
324 peer->sm_tmr.dialog_token,
325 peer->sm_tmr.status_code,
326 peer->sm_tmr.buf,
327 peer->sm_tmr.buf_len)) {
328 wpa_printf(MSG_INFO, "TDLS: Failed to retry "
329 "transmission");
330 }
331
332 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
Dmitry Shmidtf7e0a992013-05-23 11:03:10 -0700333 eloop_register_timeout(peer->sm_tmr.timer / 1000,
334 (peer->sm_tmr.timer % 1000) * 1000,
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700335 wpa_tdls_tpk_retry_timeout, sm, peer);
336 } else {
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700337 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
338
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800339 wpa_printf(MSG_DEBUG, "TDLS: Sending Teardown Request");
340 wpa_tdls_do_teardown(sm, peer,
341 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1);
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700342 }
343}
344
345
346static void wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm *sm,
347 struct wpa_tdls_peer *peer,
348 u8 action_code)
349{
350 if (action_code == peer->sm_tmr.action_code) {
351 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout cancelled for "
352 "action_code=%u", action_code);
353
354 /* Cancel Timeout registered */
355 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
356
357 /* free all resources meant for retry */
358 os_free(peer->sm_tmr.buf);
359 peer->sm_tmr.buf = NULL;
360
361 peer->sm_tmr.count = 0;
362 peer->sm_tmr.timer = 0;
363 peer->sm_tmr.buf_len = 0;
364 peer->sm_tmr.action_code = 0xff;
365 } else {
366 wpa_printf(MSG_INFO, "TDLS: Error in cancelling retry timeout "
367 "(Unknown action_code=%u)", action_code);
368 }
369}
370
371
372static void wpa_tdls_generate_tpk(struct wpa_tdls_peer *peer,
373 const u8 *own_addr, const u8 *bssid)
374{
375 u8 key_input[SHA256_MAC_LEN];
376 const u8 *nonce[2];
377 size_t len[2];
378 u8 data[3 * ETH_ALEN];
379
380 /* IEEE Std 802.11z-2010 8.5.9.1:
381 * TPK-Key-Input = SHA-256(min(SNonce, ANonce) || max(SNonce, ANonce))
382 */
383 len[0] = WPA_NONCE_LEN;
384 len[1] = WPA_NONCE_LEN;
385 if (os_memcmp(peer->inonce, peer->rnonce, WPA_NONCE_LEN) < 0) {
386 nonce[0] = peer->inonce;
387 nonce[1] = peer->rnonce;
388 } else {
389 nonce[0] = peer->rnonce;
390 nonce[1] = peer->inonce;
391 }
392 wpa_hexdump(MSG_DEBUG, "TDLS: min(Nonce)", nonce[0], WPA_NONCE_LEN);
393 wpa_hexdump(MSG_DEBUG, "TDLS: max(Nonce)", nonce[1], WPA_NONCE_LEN);
394 sha256_vector(2, nonce, len, key_input);
395 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-Key-Input",
396 key_input, SHA256_MAC_LEN);
397
398 /*
399 * TPK-Key-Data = KDF-N_KEY(TPK-Key-Input, "TDLS PMK",
400 * min(MAC_I, MAC_R) || max(MAC_I, MAC_R) || BSSID || N_KEY)
401 * TODO: is N_KEY really included in KDF Context and if so, in which
402 * presentation format (little endian 16-bit?) is it used? It gets
403 * added by the KDF anyway..
404 */
405
406 if (os_memcmp(own_addr, peer->addr, ETH_ALEN) < 0) {
407 os_memcpy(data, own_addr, ETH_ALEN);
408 os_memcpy(data + ETH_ALEN, peer->addr, ETH_ALEN);
409 } else {
410 os_memcpy(data, peer->addr, ETH_ALEN);
411 os_memcpy(data + ETH_ALEN, own_addr, ETH_ALEN);
412 }
413 os_memcpy(data + 2 * ETH_ALEN, bssid, ETH_ALEN);
414 wpa_hexdump(MSG_DEBUG, "TDLS: KDF Context", data, sizeof(data));
415
416 sha256_prf(key_input, SHA256_MAC_LEN, "TDLS PMK", data, sizeof(data),
417 (u8 *) &peer->tpk, sizeof(peer->tpk));
418 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-KCK",
419 peer->tpk.kck, sizeof(peer->tpk.kck));
420 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-TK",
421 peer->tpk.tk, sizeof(peer->tpk.tk));
422 peer->tpk_set = 1;
423}
424
425
426/**
427 * wpa_tdls_ftie_mic - Calculate TDLS FTIE MIC
428 * @kck: TPK-KCK
429 * @lnkid: Pointer to the beginning of Link Identifier IE
430 * @rsnie: Pointer to the beginning of RSN IE used for handshake
431 * @timeoutie: Pointer to the beginning of Timeout IE used for handshake
432 * @ftie: Pointer to the beginning of FT IE
433 * @mic: Pointer for writing MIC
434 *
435 * Calculate MIC for TDLS frame.
436 */
437static int wpa_tdls_ftie_mic(const u8 *kck, u8 trans_seq, const u8 *lnkid,
438 const u8 *rsnie, const u8 *timeoutie,
439 const u8 *ftie, u8 *mic)
440{
441 u8 *buf, *pos;
442 struct wpa_tdls_ftie *_ftie;
443 const struct wpa_tdls_lnkid *_lnkid;
444 int ret;
445 int len = 2 * ETH_ALEN + 1 + 2 + lnkid[1] + 2 + rsnie[1] +
446 2 + timeoutie[1] + 2 + ftie[1];
447 buf = os_zalloc(len);
448 if (!buf) {
449 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
450 return -1;
451 }
452
453 pos = buf;
454 _lnkid = (const struct wpa_tdls_lnkid *) lnkid;
455 /* 1) TDLS initiator STA MAC address */
456 os_memcpy(pos, _lnkid->init_sta, ETH_ALEN);
457 pos += ETH_ALEN;
458 /* 2) TDLS responder STA MAC address */
459 os_memcpy(pos, _lnkid->resp_sta, ETH_ALEN);
460 pos += ETH_ALEN;
461 /* 3) Transaction Sequence number */
462 *pos++ = trans_seq;
463 /* 4) Link Identifier IE */
464 os_memcpy(pos, lnkid, 2 + lnkid[1]);
465 pos += 2 + lnkid[1];
466 /* 5) RSN IE */
467 os_memcpy(pos, rsnie, 2 + rsnie[1]);
468 pos += 2 + rsnie[1];
469 /* 6) Timeout Interval IE */
470 os_memcpy(pos, timeoutie, 2 + timeoutie[1]);
471 pos += 2 + timeoutie[1];
472 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
473 os_memcpy(pos, ftie, 2 + ftie[1]);
474 _ftie = (struct wpa_tdls_ftie *) pos;
475 os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
476 pos += 2 + ftie[1];
477
478 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
479 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
480 ret = omac1_aes_128(kck, buf, pos - buf, mic);
481 os_free(buf);
482 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
483 return ret;
484}
485
486
487/**
488 * wpa_tdls_key_mic_teardown - Calculate TDLS FTIE MIC for Teardown frame
489 * @kck: TPK-KCK
490 * @trans_seq: Transaction Sequence Number (4 - Teardown)
491 * @rcode: Reason code for Teardown
492 * @dtoken: Dialog Token used for that particular link
493 * @lnkid: Pointer to the beginning of Link Identifier IE
494 * @ftie: Pointer to the beginning of FT IE
495 * @mic: Pointer for writing MIC
496 *
497 * Calculate MIC for TDLS frame.
498 */
499static int wpa_tdls_key_mic_teardown(const u8 *kck, u8 trans_seq, u16 rcode,
500 u8 dtoken, const u8 *lnkid,
501 const u8 *ftie, u8 *mic)
502{
503 u8 *buf, *pos;
504 struct wpa_tdls_ftie *_ftie;
505 int ret;
506 int len;
507
508 if (lnkid == NULL)
509 return -1;
510
511 len = 2 + lnkid[1] + sizeof(rcode) + sizeof(dtoken) +
512 sizeof(trans_seq) + 2 + ftie[1];
513
514 buf = os_zalloc(len);
515 if (!buf) {
516 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
517 return -1;
518 }
519
520 pos = buf;
521 /* 1) Link Identifier IE */
522 os_memcpy(pos, lnkid, 2 + lnkid[1]);
523 pos += 2 + lnkid[1];
524 /* 2) Reason Code */
525 WPA_PUT_LE16(pos, rcode);
526 pos += sizeof(rcode);
527 /* 3) Dialog token */
528 *pos++ = dtoken;
529 /* 4) Transaction Sequence number */
530 *pos++ = trans_seq;
531 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
532 os_memcpy(pos, ftie, 2 + ftie[1]);
533 _ftie = (struct wpa_tdls_ftie *) pos;
534 os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
535 pos += 2 + ftie[1];
536
537 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
538 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
539 ret = omac1_aes_128(kck, buf, pos - buf, mic);
540 os_free(buf);
541 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
542 return ret;
543}
544
545
546static int wpa_supplicant_verify_tdls_mic(u8 trans_seq,
547 struct wpa_tdls_peer *peer,
548 const u8 *lnkid, const u8 *timeoutie,
549 const struct wpa_tdls_ftie *ftie)
550{
551 u8 mic[16];
552
553 if (peer->tpk_set) {
554 wpa_tdls_ftie_mic(peer->tpk.kck, trans_seq, lnkid,
555 peer->rsnie_p, timeoutie, (u8 *) ftie,
556 mic);
557 if (os_memcmp(mic, ftie->mic, 16) != 0) {
558 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in FTIE - "
559 "dropping packet");
560 wpa_hexdump(MSG_DEBUG, "TDLS: Received MIC",
561 ftie->mic, 16);
562 wpa_hexdump(MSG_DEBUG, "TDLS: Calculated MIC",
563 mic, 16);
564 return -1;
565 }
566 } else {
567 wpa_printf(MSG_WARNING, "TDLS: Could not verify TDLS MIC, "
568 "TPK not set - dropping packet");
569 return -1;
570 }
571 return 0;
572}
573
574
575static int wpa_supplicant_verify_tdls_mic_teardown(
576 u8 trans_seq, u16 rcode, u8 dtoken, struct wpa_tdls_peer *peer,
577 const u8 *lnkid, const struct wpa_tdls_ftie *ftie)
578{
579 u8 mic[16];
580
581 if (peer->tpk_set) {
582 wpa_tdls_key_mic_teardown(peer->tpk.kck, trans_seq, rcode,
583 dtoken, lnkid, (u8 *) ftie, mic);
584 if (os_memcmp(mic, ftie->mic, 16) != 0) {
585 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in Teardown - "
586 "dropping packet");
587 return -1;
588 }
589 } else {
590 wpa_printf(MSG_INFO, "TDLS: Could not verify TDLS Teardown "
591 "MIC, TPK not set - dropping packet");
592 return -1;
593 }
594 return 0;
595}
596
597
598static void wpa_tdls_tpk_timeout(void *eloop_ctx, void *timeout_ctx)
599{
600 struct wpa_sm *sm = eloop_ctx;
601 struct wpa_tdls_peer *peer = timeout_ctx;
602
603 /*
604 * On TPK lifetime expiration, we have an option of either tearing down
605 * the direct link or trying to re-initiate it. The selection of what
606 * to do is not strictly speaking controlled by our role in the expired
607 * link, but for now, use that to select whether to renew or tear down
608 * the link.
609 */
610
611 if (peer->initiator) {
612 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
613 " - try to renew", MAC2STR(peer->addr));
614 wpa_tdls_start(sm, peer->addr);
615 } else {
616 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
617 " - tear down", MAC2STR(peer->addr));
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800618 wpa_tdls_do_teardown(sm, peer,
619 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1);
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700620 }
621}
622
623
624static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
625{
626 wpa_printf(MSG_DEBUG, "TDLS: Clear state for peer " MACSTR,
627 MAC2STR(peer->addr));
628 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
629 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
Dmitry Shmidt8da800a2013-04-24 12:57:01 -0700630 peer->reconfig_key = 0;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700631 peer->initiator = 0;
632 os_free(peer->sm_tmr.buf);
633 peer->sm_tmr.buf = NULL;
Dmitry Shmidtf8623282013-02-20 14:34:59 -0800634 os_free(peer->ht_capabilities);
635 peer->ht_capabilities = NULL;
Dmitry Shmidt33e38bf2013-02-27 12:56:00 -0800636 os_free(peer->vht_capabilities);
637 peer->vht_capabilities = NULL;
Dmitry Shmidtf8623282013-02-20 14:34:59 -0800638 os_free(peer->ext_capab);
639 peer->ext_capab = NULL;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700640 peer->rsnie_i_len = peer->rsnie_p_len = 0;
641 peer->cipher = 0;
642 peer->tpk_set = peer->tpk_success = 0;
643 os_memset(&peer->tpk, 0, sizeof(peer->tpk));
644 os_memset(peer->inonce, 0, WPA_NONCE_LEN);
645 os_memset(peer->rnonce, 0, WPA_NONCE_LEN);
646}
647
648
649static void wpa_tdls_linkid(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
650 struct wpa_tdls_lnkid *lnkid)
651{
652 lnkid->ie_type = WLAN_EID_LINK_ID;
653 lnkid->ie_len = 3 * ETH_ALEN;
654 os_memcpy(lnkid->bssid, sm->bssid, ETH_ALEN);
655 if (peer->initiator) {
656 os_memcpy(lnkid->init_sta, sm->own_addr, ETH_ALEN);
657 os_memcpy(lnkid->resp_sta, peer->addr, ETH_ALEN);
658 } else {
659 os_memcpy(lnkid->init_sta, peer->addr, ETH_ALEN);
660 os_memcpy(lnkid->resp_sta, sm->own_addr, ETH_ALEN);
661 }
662}
663
664
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800665int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr, u16 reason_code)
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700666{
667 struct wpa_tdls_peer *peer;
668 struct wpa_tdls_ftie *ftie;
669 struct wpa_tdls_lnkid lnkid;
670 u8 dialog_token;
671 u8 *rbuf, *pos;
672 int ielen;
673
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800674 if (sm->tdls_disabled || !sm->tdls_supported)
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700675 return -1;
676
677 /* Find the node and free from the list */
678 for (peer = sm->tdls; peer; peer = peer->next) {
679 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
680 break;
681 }
682
683 if (peer == NULL) {
684 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
685 "Teardown " MACSTR, MAC2STR(addr));
686 return 0;
687 }
688
689 dialog_token = peer->dtoken;
690
691 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown for " MACSTR,
692 MAC2STR(addr));
693
694 ielen = 0;
695 if (wpa_tdls_get_privacy(sm) && peer->tpk_set && peer->tpk_success) {
696 /* To add FTIE for Teardown request and compute MIC */
697 ielen += sizeof(*ftie);
698#ifdef CONFIG_TDLS_TESTING
699 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
700 ielen += 170;
701#endif /* CONFIG_TDLS_TESTING */
702 }
703
704 rbuf = os_zalloc(ielen + 1);
705 if (rbuf == NULL)
706 return -1;
707 pos = rbuf;
708
Dmitry Shmidt51b6ea82013-05-08 10:42:09 -0700709 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success)
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700710 goto skip_ies;
711
712 ftie = (struct wpa_tdls_ftie *) pos;
713 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
714 /* Using the recent nonce which should be for CONFIRM frame */
715 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
716 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
717 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
718 pos = (u8 *) (ftie + 1);
719#ifdef CONFIG_TDLS_TESTING
720 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
721 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
722 "FTIE");
723 ftie->ie_len += 170;
724 *pos++ = 255; /* FTIE subelem */
725 *pos++ = 168; /* FTIE subelem length */
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800726 pos += 168;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700727 }
728#endif /* CONFIG_TDLS_TESTING */
729 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TDLS Teardown handshake",
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800730 (u8 *) ftie, pos - (u8 *) ftie);
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700731
732 /* compute MIC before sending */
733 wpa_tdls_linkid(sm, peer, &lnkid);
734 wpa_tdls_key_mic_teardown(peer->tpk.kck, 4, reason_code,
735 dialog_token, (u8 *) &lnkid, (u8 *) ftie,
736 ftie->mic);
737
738skip_ies:
739 /* TODO: register for a Timeout handler, if Teardown is not received at
740 * the other end, then try again another time */
741
742 /* request driver to send Teardown using this FTIE */
743 wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_TEARDOWN, 0,
Dmitry Shmidt4b9d52f2013-02-05 17:44:43 -0800744 reason_code, rbuf, pos - rbuf);
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700745 os_free(rbuf);
746
747 /* clear the Peerkey statemachine */
748 wpa_tdls_peer_free(sm, peer);
749
750 return 0;
751}
752
753
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800754int wpa_tdls_teardown_link(struct wpa_sm *sm, const u8 *addr, u16 reason_code)
755{
756 struct wpa_tdls_peer *peer;
757
758 if (sm->tdls_disabled || !sm->tdls_supported)
759 return -1;
760
761 for (peer = sm->tdls; peer; peer = peer->next) {
762 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
763 break;
764 }
765
766 if (peer == NULL) {
767 wpa_printf(MSG_DEBUG, "TDLS: Could not find peer " MACSTR
768 " for link Teardown", MAC2STR(addr));
769 return -1;
770 }
771
772 if (!peer->tpk_success) {
773 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR
774 " not connected - cannot Teardown link", MAC2STR(addr));
775 return -1;
776 }
777
778 return wpa_tdls_do_teardown(sm, peer, reason_code, 0);
779}
780
781
782void wpa_tdls_disable_link(struct wpa_sm *sm, const u8 *addr)
783{
784 struct wpa_tdls_peer *peer;
785
786 for (peer = sm->tdls; peer; peer = peer->next) {
787 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
788 break;
789 }
790
791 if (peer) {
792 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, addr);
793 wpa_tdls_peer_free(sm, peer);
794 }
795}
796
797
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700798static int wpa_tdls_recv_teardown(struct wpa_sm *sm, const u8 *src_addr,
799 const u8 *buf, size_t len)
800{
801 struct wpa_tdls_peer *peer = NULL;
802 struct wpa_tdls_ftie *ftie;
803 struct wpa_tdls_lnkid *lnkid;
804 struct wpa_eapol_ie_parse kde;
805 u16 reason_code;
806 const u8 *pos;
807 int ielen;
808
809 /* Find the node and free from the list */
810 for (peer = sm->tdls; peer; peer = peer->next) {
811 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
812 break;
813 }
814
815 if (peer == NULL) {
816 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
817 "Teardown " MACSTR, MAC2STR(src_addr));
818 return 0;
819 }
820
821 pos = buf;
822 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
823
824 reason_code = WPA_GET_LE16(pos);
825 pos += 2;
826
827 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown Request from " MACSTR
828 " (reason code %u)", MAC2STR(src_addr), reason_code);
829
830 ielen = len - (pos - buf); /* start of IE in buf */
831 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) {
832 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in Teardown");
833 return -1;
834 }
835
836 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
837 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TDLS "
838 "Teardown");
839 return -1;
840 }
841 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
842
843 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success)
844 goto skip_ftie;
845
846 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
847 wpa_printf(MSG_INFO, "TDLS: No FTIE in TDLS Teardown");
848 return -1;
849 }
850
851 ftie = (struct wpa_tdls_ftie *) kde.ftie;
852
853 /* Process MIC check to see if TDLS Teardown is right */
854 if (wpa_supplicant_verify_tdls_mic_teardown(4, reason_code,
855 peer->dtoken, peer,
856 (u8 *) lnkid, ftie) < 0) {
857 wpa_printf(MSG_DEBUG, "TDLS: MIC failure for TDLS "
858 "Teardown Request from " MACSTR, MAC2STR(src_addr));
859 return -1;
860 }
861
862skip_ftie:
863 /*
864 * Request the driver to disable the direct link and clear associated
865 * keys.
866 */
867 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
868
869 /* clear the Peerkey statemachine */
870 wpa_tdls_peer_free(sm, peer);
871
872 return 0;
873}
874
875
876/**
877 * wpa_tdls_send_error - To send suitable TDLS status response with
878 * appropriate status code mentioning reason for error/failure.
879 * @dst - MAC addr of Peer station
880 * @tdls_action - TDLS frame type for which error code is sent
881 * @status - status code mentioning reason
882 */
883
884static int wpa_tdls_send_error(struct wpa_sm *sm, const u8 *dst,
885 u8 tdls_action, u8 dialog_token, u16 status)
886{
887 wpa_printf(MSG_DEBUG, "TDLS: Sending error to " MACSTR
888 " (action=%u status=%u)",
889 MAC2STR(dst), tdls_action, status);
890 return wpa_tdls_tpk_send(sm, dst, tdls_action, dialog_token, status,
891 NULL, 0);
892}
893
894
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800895static struct wpa_tdls_peer *
Dmitry Shmidt4b9d52f2013-02-05 17:44:43 -0800896wpa_tdls_add_peer(struct wpa_sm *sm, const u8 *addr, int *existing)
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800897{
898 struct wpa_tdls_peer *peer;
899
Dmitry Shmidt4b9d52f2013-02-05 17:44:43 -0800900 if (existing)
901 *existing = 0;
902 for (peer = sm->tdls; peer; peer = peer->next) {
903 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) {
904 if (existing)
905 *existing = 1;
906 return peer; /* re-use existing entry */
907 }
908 }
909
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -0800910 wpa_printf(MSG_INFO, "TDLS: Creating peer entry for " MACSTR,
911 MAC2STR(addr));
912
913 peer = os_zalloc(sizeof(*peer));
914 if (peer == NULL)
915 return NULL;
916
917 os_memcpy(peer->addr, addr, ETH_ALEN);
918 peer->next = sm->tdls;
919 sm->tdls = peer;
920
921 return peer;
922}
923
924
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -0700925static int wpa_tdls_send_tpk_m1(struct wpa_sm *sm,
926 struct wpa_tdls_peer *peer)
927{
928 size_t buf_len;
929 struct wpa_tdls_timeoutie timeoutie;
930 u16 rsn_capab;
931 struct wpa_tdls_ftie *ftie;
932 u8 *rbuf, *pos, *count_pos;
933 u16 count;
934 struct rsn_ie_hdr *hdr;
935
936 if (!wpa_tdls_get_privacy(sm)) {
937 wpa_printf(MSG_DEBUG, "TDLS: No security used on the link");
938 peer->rsnie_i_len = 0;
939 goto skip_rsnie;
940 }
941
942 /*
943 * TPK Handshake Message 1:
944 * FTIE: ANonce=0, SNonce=initiator nonce MIC=0, DataKDs=(RSNIE_I,
945 * Timeout Interval IE))
946 */
947
948 /* Filling RSN IE */
949 hdr = (struct rsn_ie_hdr *) peer->rsnie_i;
950 hdr->elem_id = WLAN_EID_RSN;
951 WPA_PUT_LE16(hdr->version, RSN_VERSION);
952
953 pos = (u8 *) (hdr + 1);
954 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
955 pos += RSN_SELECTOR_LEN;
956 count_pos = pos;
957 pos += 2;
958
959 count = 0;
960
961 /*
962 * AES-CCMP is the default Encryption preferred for TDLS, so
963 * RSN IE is filled only with CCMP CIPHER
964 * Note: TKIP is not used to encrypt TDLS link.
965 *
966 * Regardless of the cipher used on the AP connection, select CCMP
967 * here.
968 */
969 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
970 pos += RSN_SELECTOR_LEN;
971 count++;
972
973 WPA_PUT_LE16(count_pos, count);
974
975 WPA_PUT_LE16(pos, 1);
976 pos += 2;
977 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
978 pos += RSN_SELECTOR_LEN;
979
980 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
981 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
982#ifdef CONFIG_TDLS_TESTING
983 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
984 wpa_printf(MSG_DEBUG, "TDLS: Use alternative RSN IE for "
985 "testing");
986 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
987 }
988#endif /* CONFIG_TDLS_TESTING */
989 WPA_PUT_LE16(pos, rsn_capab);
990 pos += 2;
991#ifdef CONFIG_TDLS_TESTING
992 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
993 /* Number of PMKIDs */
994 *pos++ = 0x00;
995 *pos++ = 0x00;
996 }
997#endif /* CONFIG_TDLS_TESTING */
998
999 hdr->len = (pos - peer->rsnie_i) - 2;
1000 peer->rsnie_i_len = pos - peer->rsnie_i;
1001 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
1002 peer->rsnie_i, peer->rsnie_i_len);
1003
1004skip_rsnie:
1005 buf_len = 0;
1006 if (wpa_tdls_get_privacy(sm))
1007 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1008 sizeof(struct wpa_tdls_timeoutie);
1009#ifdef CONFIG_TDLS_TESTING
1010 if (wpa_tdls_get_privacy(sm) &&
1011 (tdls_testing & TDLS_TESTING_LONG_FRAME))
1012 buf_len += 170;
1013 if (tdls_testing & TDLS_TESTING_DIFF_BSSID)
1014 buf_len += sizeof(struct wpa_tdls_lnkid);
1015#endif /* CONFIG_TDLS_TESTING */
1016 rbuf = os_zalloc(buf_len + 1);
1017 if (rbuf == NULL) {
1018 wpa_tdls_peer_free(sm, peer);
1019 return -1;
1020 }
1021 pos = rbuf;
1022
1023 if (!wpa_tdls_get_privacy(sm))
1024 goto skip_ies;
1025
1026 /* Initiator RSN IE */
1027 pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len);
1028
1029 ftie = (struct wpa_tdls_ftie *) pos;
1030 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1031 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1032
1033 if (os_get_random(peer->inonce, WPA_NONCE_LEN)) {
1034 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1035 "TDLS: Failed to get random data for initiator Nonce");
1036 os_free(rbuf);
1037 wpa_tdls_peer_free(sm, peer);
1038 return -1;
1039 }
1040 wpa_hexdump(MSG_DEBUG, "TDLS: Initiator Nonce for TPK handshake",
1041 peer->inonce, WPA_NONCE_LEN);
1042 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1043
1044 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK Handshake M1",
1045 (u8 *) ftie, sizeof(struct wpa_tdls_ftie));
1046
1047 pos = (u8 *) (ftie + 1);
1048
1049#ifdef CONFIG_TDLS_TESTING
1050 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1051 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1052 "FTIE");
1053 ftie->ie_len += 170;
1054 *pos++ = 255; /* FTIE subelem */
1055 *pos++ = 168; /* FTIE subelem length */
1056 pos += 168;
1057 }
1058#endif /* CONFIG_TDLS_TESTING */
1059
1060 /* Lifetime */
1061 peer->lifetime = TPK_LIFETIME;
1062#ifdef CONFIG_TDLS_TESTING
1063 if (tdls_testing & TDLS_TESTING_SHORT_LIFETIME) {
1064 wpa_printf(MSG_DEBUG, "TDLS: Testing - use short TPK "
1065 "lifetime");
1066 peer->lifetime = 301;
1067 }
1068 if (tdls_testing & TDLS_TESTING_LONG_LIFETIME) {
1069 wpa_printf(MSG_DEBUG, "TDLS: Testing - use long TPK "
1070 "lifetime");
1071 peer->lifetime = 0xffffffff;
1072 }
1073#endif /* CONFIG_TDLS_TESTING */
1074 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1075 sizeof(timeoutie), peer->lifetime);
1076 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime);
1077
1078skip_ies:
1079
1080#ifdef CONFIG_TDLS_TESTING
1081 if (tdls_testing & TDLS_TESTING_DIFF_BSSID) {
1082 wpa_printf(MSG_DEBUG, "TDLS: Testing - use incorrect BSSID in "
1083 "Link Identifier");
1084 struct wpa_tdls_lnkid *l = (struct wpa_tdls_lnkid *) pos;
1085 wpa_tdls_linkid(sm, peer, l);
1086 l->bssid[5] ^= 0x01;
1087 pos += sizeof(*l);
1088 }
1089#endif /* CONFIG_TDLS_TESTING */
1090
1091 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Request / TPK "
1092 "Handshake Message 1 (peer " MACSTR ")",
1093 MAC2STR(peer->addr));
1094
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001095 wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_SETUP_REQUEST, 1, 0,
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001096 rbuf, pos - rbuf);
1097 os_free(rbuf);
1098
1099 return 0;
1100}
1101
1102
1103static int wpa_tdls_send_tpk_m2(struct wpa_sm *sm,
1104 const unsigned char *src_addr, u8 dtoken,
1105 struct wpa_tdls_lnkid *lnkid,
1106 const struct wpa_tdls_peer *peer)
1107{
1108 u8 *rbuf, *pos;
1109 size_t buf_len;
1110 u32 lifetime;
1111 struct wpa_tdls_timeoutie timeoutie;
1112 struct wpa_tdls_ftie *ftie;
1113
1114 buf_len = 0;
1115 if (wpa_tdls_get_privacy(sm)) {
1116 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1117 * Lifetime */
1118 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1119 sizeof(struct wpa_tdls_timeoutie);
1120#ifdef CONFIG_TDLS_TESTING
1121 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1122 buf_len += 170;
1123#endif /* CONFIG_TDLS_TESTING */
1124 }
1125
1126 rbuf = os_zalloc(buf_len + 1);
1127 if (rbuf == NULL)
1128 return -1;
1129 pos = rbuf;
1130
1131 if (!wpa_tdls_get_privacy(sm))
1132 goto skip_ies;
1133
1134 /* Peer RSN IE */
1135 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1136
1137 ftie = (struct wpa_tdls_ftie *) pos;
1138 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1139 /* TODO: ftie->mic_control to set 2-RESPONSE */
1140 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1141 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1142 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1143 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK M2",
1144 (u8 *) ftie, sizeof(*ftie));
1145
1146 pos = (u8 *) (ftie + 1);
1147
1148#ifdef CONFIG_TDLS_TESTING
1149 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1150 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1151 "FTIE");
1152 ftie->ie_len += 170;
1153 *pos++ = 255; /* FTIE subelem */
1154 *pos++ = 168; /* FTIE subelem length */
1155 pos += 168;
1156 }
1157#endif /* CONFIG_TDLS_TESTING */
1158
1159 /* Lifetime */
1160 lifetime = peer->lifetime;
1161#ifdef CONFIG_TDLS_TESTING
1162 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_RESP) {
1163 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1164 "lifetime in response");
1165 lifetime++;
1166 }
1167#endif /* CONFIG_TDLS_TESTING */
1168 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1169 sizeof(timeoutie), lifetime);
1170 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds from initiator",
1171 lifetime);
1172
1173 /* compute MIC before sending */
1174 wpa_tdls_ftie_mic(peer->tpk.kck, 2, (u8 *) lnkid, peer->rsnie_p,
1175 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1176
1177skip_ies:
1178 wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0,
1179 rbuf, pos - rbuf);
1180 os_free(rbuf);
1181
1182 return 0;
1183}
1184
1185
1186static int wpa_tdls_send_tpk_m3(struct wpa_sm *sm,
1187 const unsigned char *src_addr, u8 dtoken,
1188 struct wpa_tdls_lnkid *lnkid,
1189 const struct wpa_tdls_peer *peer)
1190{
1191 u8 *rbuf, *pos;
1192 size_t buf_len;
1193 struct wpa_tdls_ftie *ftie;
1194 struct wpa_tdls_timeoutie timeoutie;
1195 u32 lifetime;
1196
1197 buf_len = 0;
1198 if (wpa_tdls_get_privacy(sm)) {
1199 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1200 * Lifetime */
1201 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1202 sizeof(struct wpa_tdls_timeoutie);
1203#ifdef CONFIG_TDLS_TESTING
1204 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1205 buf_len += 170;
1206#endif /* CONFIG_TDLS_TESTING */
1207 }
1208
1209 rbuf = os_zalloc(buf_len + 1);
1210 if (rbuf == NULL)
1211 return -1;
1212 pos = rbuf;
1213
1214 if (!wpa_tdls_get_privacy(sm))
1215 goto skip_ies;
1216
1217 /* Peer RSN IE */
1218 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1219
1220 ftie = (struct wpa_tdls_ftie *) pos;
1221 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1222 /*TODO: ftie->mic_control to set 3-CONFIRM */
1223 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1224 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1225 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1226
1227 pos = (u8 *) (ftie + 1);
1228
1229#ifdef CONFIG_TDLS_TESTING
1230 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1231 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1232 "FTIE");
1233 ftie->ie_len += 170;
1234 *pos++ = 255; /* FTIE subelem */
1235 *pos++ = 168; /* FTIE subelem length */
1236 pos += 168;
1237 }
1238#endif /* CONFIG_TDLS_TESTING */
1239
1240 /* Lifetime */
1241 lifetime = peer->lifetime;
1242#ifdef CONFIG_TDLS_TESTING
1243 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_CONF) {
1244 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1245 "lifetime in confirm");
1246 lifetime++;
1247 }
1248#endif /* CONFIG_TDLS_TESTING */
1249 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1250 sizeof(timeoutie), lifetime);
1251 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds",
1252 lifetime);
1253
1254 /* compute MIC before sending */
1255 wpa_tdls_ftie_mic(peer->tpk.kck, 3, (u8 *) lnkid, peer->rsnie_p,
1256 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1257
1258skip_ies:
1259 wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 0,
1260 rbuf, pos - rbuf);
1261 os_free(rbuf);
1262
1263 return 0;
1264}
1265
1266
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001267static int wpa_tdls_send_discovery_response(struct wpa_sm *sm,
1268 struct wpa_tdls_peer *peer,
1269 u8 dialog_token)
1270{
1271 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Discovery Response "
1272 "(peer " MACSTR ")", MAC2STR(peer->addr));
1273
1274 return wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_DISCOVERY_RESPONSE,
1275 dialog_token, 0, NULL, 0);
1276}
1277
1278
1279static int
1280wpa_tdls_process_discovery_request(struct wpa_sm *sm, const u8 *addr,
1281 const u8 *buf, size_t len)
1282{
1283 struct wpa_eapol_ie_parse kde;
1284 const struct wpa_tdls_lnkid *lnkid;
1285 struct wpa_tdls_peer *peer;
1286 size_t min_req_len = sizeof(struct wpa_tdls_frame) +
1287 1 /* dialog token */ + sizeof(struct wpa_tdls_lnkid);
1288 u8 dialog_token;
1289
1290 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from " MACSTR,
1291 MAC2STR(addr));
1292
1293 if (len < min_req_len) {
1294 wpa_printf(MSG_DEBUG, "TDLS Discovery Request is too short: "
1295 "%d", (int) len);
1296 return -1;
1297 }
1298
1299 dialog_token = buf[sizeof(struct wpa_tdls_frame)];
1300
1301 if (wpa_supplicant_parse_ies(buf + sizeof(struct wpa_tdls_frame) + 1,
1302 len - (sizeof(struct wpa_tdls_frame) + 1),
1303 &kde) < 0)
1304 return -1;
1305
1306 if (!kde.lnkid) {
1307 wpa_printf(MSG_DEBUG, "TDLS: Link ID not found in Discovery "
1308 "Request");
1309 return -1;
1310 }
1311
1312 lnkid = (const struct wpa_tdls_lnkid *) kde.lnkid;
1313
1314 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1315 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from different "
1316 " BSS " MACSTR, MAC2STR(lnkid->bssid));
1317 return -1;
1318 }
1319
Dmitry Shmidt4b9d52f2013-02-05 17:44:43 -08001320 peer = wpa_tdls_add_peer(sm, addr, NULL);
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001321 if (peer == NULL)
1322 return -1;
1323
1324 return wpa_tdls_send_discovery_response(sm, peer, dialog_token);
1325}
1326
1327
1328int wpa_tdls_send_discovery_request(struct wpa_sm *sm, const u8 *addr)
1329{
1330 if (sm->tdls_disabled || !sm->tdls_supported)
1331 return -1;
1332
1333 wpa_printf(MSG_DEBUG, "TDLS: Sending Discovery Request to peer "
1334 MACSTR, MAC2STR(addr));
1335 return wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_DISCOVERY_REQUEST,
1336 1, 0, NULL, 0);
1337}
1338
1339
1340static int copy_supp_rates(const struct wpa_eapol_ie_parse *kde,
1341 struct wpa_tdls_peer *peer)
1342{
1343 if (!kde->supp_rates) {
1344 wpa_printf(MSG_DEBUG, "TDLS: No supported rates received");
1345 return -1;
1346 }
Dmitry Shmidta54fa5f2013-01-15 13:53:35 -08001347 peer->supp_rates_len = merge_byte_arrays(
1348 peer->supp_rates, sizeof(peer->supp_rates),
1349 kde->supp_rates + 2, kde->supp_rates_len - 2,
1350 kde->ext_supp_rates + 2, kde->ext_supp_rates_len - 2);
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001351 return 0;
1352}
1353
1354
Dmitry Shmidtf8623282013-02-20 14:34:59 -08001355static int copy_peer_ht_capab(const struct wpa_eapol_ie_parse *kde,
1356 struct wpa_tdls_peer *peer)
1357{
1358 if (!kde->ht_capabilities ||
1359 kde->ht_capabilities_len <
1360 sizeof(struct ieee80211_ht_capabilities) ) {
1361 wpa_printf(MSG_DEBUG, "TDLS: No supported ht capabilities "
1362 "received");
1363 return 0;
1364 }
1365
1366 if (!peer->ht_capabilities) {
1367 peer->ht_capabilities =
1368 os_zalloc(sizeof(struct ieee80211_ht_capabilities));
1369 if (peer->ht_capabilities == NULL)
1370 return -1;
1371 }
1372
1373 os_memcpy(peer->ht_capabilities, kde->ht_capabilities,
1374 sizeof(struct ieee80211_ht_capabilities));
1375 wpa_hexdump(MSG_DEBUG, "TDLS: Peer HT capabilities",
1376 (u8 *) peer->ht_capabilities,
1377 sizeof(struct ieee80211_ht_capabilities));
1378
1379 return 0;
1380}
1381
1382
Dmitry Shmidt33e38bf2013-02-27 12:56:00 -08001383static int copy_peer_vht_capab(const struct wpa_eapol_ie_parse *kde,
1384 struct wpa_tdls_peer *peer)
1385{
1386 if (!kde->vht_capabilities ||
1387 kde->vht_capabilities_len <
1388 sizeof(struct ieee80211_vht_capabilities) ) {
1389 wpa_printf(MSG_DEBUG, "TDLS: No supported vht capabilities "
1390 "received");
1391 return 0;
1392 }
1393
1394 if (!peer->vht_capabilities) {
1395 peer->vht_capabilities =
1396 os_zalloc(sizeof(struct ieee80211_vht_capabilities));
1397 if (peer->vht_capabilities == NULL)
1398 return -1;
1399 }
1400
1401 os_memcpy(peer->vht_capabilities, kde->vht_capabilities,
1402 sizeof(struct ieee80211_vht_capabilities));
1403 wpa_hexdump(MSG_DEBUG, "TDLS: Peer VHT capabilities",
1404 (u8 *) peer->vht_capabilities,
1405 sizeof(struct ieee80211_vht_capabilities));
1406
1407 return 0;
1408}
1409
1410
Dmitry Shmidtf8623282013-02-20 14:34:59 -08001411static int copy_peer_ext_capab(const struct wpa_eapol_ie_parse *kde,
1412 struct wpa_tdls_peer *peer)
1413{
1414 if (!kde->ext_capab) {
1415 wpa_printf(MSG_DEBUG, "TDLS: No extended capabilities "
1416 "received");
1417 return 0;
1418 }
1419
1420 if (!peer->ext_capab || peer->ext_capab_len < kde->ext_capab_len - 2) {
1421 /* Need to allocate buffer to fit the new information */
1422 os_free(peer->ext_capab);
1423 peer->ext_capab = os_zalloc(kde->ext_capab_len - 2);
1424 if (peer->ext_capab == NULL)
1425 return -1;
1426 }
1427
1428 peer->ext_capab_len = kde->ext_capab_len - 2;
1429 os_memcpy(peer->ext_capab, kde->ext_capab + 2, peer->ext_capab_len);
1430
1431 return 0;
1432}
1433
1434
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001435static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr,
1436 const u8 *buf, size_t len)
1437{
1438 struct wpa_tdls_peer *peer;
1439 struct wpa_eapol_ie_parse kde;
1440 struct wpa_ie_data ie;
1441 int cipher;
1442 const u8 *cpos;
1443 struct wpa_tdls_ftie *ftie = NULL;
1444 struct wpa_tdls_timeoutie *timeoutie;
1445 struct wpa_tdls_lnkid *lnkid;
1446 u32 lifetime = 0;
1447#if 0
1448 struct rsn_ie_hdr *hdr;
1449 u8 *pos;
1450 u16 rsn_capab;
1451 u16 rsn_ver;
1452#endif
1453 u8 dtoken;
1454 u16 ielen;
1455 u16 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
1456 int tdls_prohibited = sm->tdls_prohibited;
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001457 int existing_peer = 0;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001458
1459 if (len < 3 + 3)
1460 return -1;
1461
1462 cpos = buf;
1463 cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1464
1465 /* driver had already verified the frame format */
1466 dtoken = *cpos++; /* dialog token */
1467
1468 wpa_printf(MSG_INFO, "TDLS: Dialog Token in TPK M1 %d", dtoken);
1469
Dmitry Shmidt4b9d52f2013-02-05 17:44:43 -08001470 peer = wpa_tdls_add_peer(sm, src_addr, &existing_peer);
1471 if (peer == NULL)
1472 goto error;
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001473
Dmitry Shmidt0ccb66e2013-03-29 16:41:28 -07001474 /* If found, use existing entry instead of adding a new one;
1475 * how to handle the case where both ends initiate at the
1476 * same time? */
1477 if (existing_peer) {
1478 if (peer->tpk_success) {
1479 wpa_printf(MSG_DEBUG, "TDLS: TDLS Setup Request while "
1480 "direct link is enabled - tear down the "
1481 "old link first");
1482#if 0
1483 /* TODO: Disabling the link would be more proper
1484 * operation here, but it seems to trigger a race with
1485 * some drivers handling the new request frame. */
1486 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1487#else
1488 if (sm->tdls_external_setup)
1489 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK,
1490 src_addr);
1491 else
1492 wpa_tdls_del_key(sm, peer);
1493#endif
1494 wpa_tdls_peer_free(sm, peer);
1495 }
1496
1497 /*
1498 * An entry is already present, so check if we already sent a
1499 * TDLS Setup Request. If so, compare MAC addresses and let the
1500 * STA with the lower MAC address continue as the initiator.
1501 * The other negotiation is terminated.
1502 */
1503 if (peer->initiator) {
1504 if (os_memcmp(sm->own_addr, src_addr, ETH_ALEN) < 0) {
1505 wpa_printf(MSG_DEBUG, "TDLS: Discard request "
1506 "from peer with higher address "
1507 MACSTR, MAC2STR(src_addr));
1508 return -1;
1509 } else {
1510 wpa_printf(MSG_DEBUG, "TDLS: Accept request "
1511 "from peer with lower address "
1512 MACSTR " (terminate previously "
1513 "initiated negotiation",
1514 MAC2STR(src_addr));
1515 if (sm->tdls_external_setup)
1516 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK,
1517 src_addr);
1518 else
1519 wpa_tdls_del_key(sm, peer);
1520 wpa_tdls_peer_free(sm, peer);
1521 }
1522 }
1523 }
1524
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001525 /* capability information */
1526 peer->capability = WPA_GET_LE16(cpos);
1527 cpos += 2;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001528
1529 ielen = len - (cpos - buf); /* start of IE in buf */
1530 if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0) {
1531 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M1");
1532 goto error;
1533 }
1534
1535 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1536 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
1537 "TPK M1");
1538 goto error;
1539 }
1540 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M1",
1541 kde.lnkid, kde.lnkid_len);
1542 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1543 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1544 wpa_printf(MSG_INFO, "TDLS: TPK M1 from diff BSS");
1545 status = WLAN_STATUS_NOT_IN_SAME_BSS;
1546 goto error;
1547 }
1548
1549 wpa_printf(MSG_DEBUG, "TDLS: TPK M1 - TPK initiator " MACSTR,
1550 MAC2STR(src_addr));
1551
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001552 if (copy_supp_rates(&kde, peer) < 0)
1553 goto error;
1554
Dmitry Shmidtf8623282013-02-20 14:34:59 -08001555 if (copy_peer_ht_capab(&kde, peer) < 0)
1556 goto error;
1557
Dmitry Shmidt33e38bf2013-02-27 12:56:00 -08001558 if (copy_peer_vht_capab(&kde, peer) < 0)
1559 goto error;
1560
Dmitry Shmidtf8623282013-02-20 14:34:59 -08001561 if (copy_peer_ext_capab(&kde, peer) < 0)
1562 goto error;
1563
1564 peer->qos_info = kde.qosinfo;
1565
Dmitry Shmidt51b6ea82013-05-08 10:42:09 -07001566 peer->aid = kde.aid;
1567
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001568#ifdef CONFIG_TDLS_TESTING
1569 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
Dmitry Shmidt4b9d52f2013-02-05 17:44:43 -08001570 peer = wpa_tdls_add_peer(sm, src_addr, NULL);
1571 if (peer == NULL)
1572 goto error;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001573 wpa_printf(MSG_DEBUG, "TDLS: Testing concurrent initiation of "
1574 "TDLS setup - send own request");
1575 peer->initiator = 1;
1576 wpa_tdls_send_tpk_m1(sm, peer);
1577 }
1578
1579 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
1580 tdls_prohibited) {
1581 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
1582 "on TDLS");
1583 tdls_prohibited = 0;
1584 }
1585#endif /* CONFIG_TDLS_TESTING */
1586
1587 if (tdls_prohibited) {
1588 wpa_printf(MSG_INFO, "TDLS: TDLS prohibited in this BSS");
1589 status = WLAN_STATUS_REQUEST_DECLINED;
1590 goto error;
1591 }
1592
1593 if (!wpa_tdls_get_privacy(sm)) {
1594 if (kde.rsn_ie) {
1595 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M1 while "
1596 "security is disabled");
1597 status = WLAN_STATUS_SECURITY_DISABLED;
1598 goto error;
1599 }
1600 goto skip_rsn;
1601 }
1602
1603 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
1604 kde.rsn_ie == NULL) {
1605 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M1");
1606 status = WLAN_STATUS_INVALID_PARAMETERS;
1607 goto error;
1608 }
1609
1610 if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
1611 wpa_printf(MSG_INFO, "TDLS: Too long Initiator RSN IE in "
1612 "TPK M1");
1613 status = WLAN_STATUS_INVALID_RSNIE;
1614 goto error;
1615 }
1616
1617 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
1618 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M1");
1619 status = WLAN_STATUS_INVALID_RSNIE;
1620 goto error;
1621 }
1622
1623 cipher = ie.pairwise_cipher;
1624 if (cipher & WPA_CIPHER_CCMP) {
1625 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
1626 cipher = WPA_CIPHER_CCMP;
1627 } else {
1628 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M1");
1629 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
1630 goto error;
1631 }
1632
1633 if ((ie.capabilities &
1634 (WPA_CAPABILITY_NO_PAIRWISE | WPA_CAPABILITY_PEERKEY_ENABLED)) !=
1635 WPA_CAPABILITY_PEERKEY_ENABLED) {
1636 wpa_printf(MSG_INFO, "TDLS: Invalid RSN Capabilities in "
1637 "TPK M1");
1638 status = WLAN_STATUS_INVALID_RSN_IE_CAPAB;
1639 goto error;
1640 }
1641
1642 /* Lifetime */
1643 if (kde.key_lifetime == NULL) {
1644 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1");
1645 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1646 goto error;
1647 }
1648 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
1649 lifetime = WPA_GET_LE32(timeoutie->value);
1650 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime);
1651 if (lifetime < 300) {
1652 wpa_printf(MSG_INFO, "TDLS: Too short TPK lifetime");
1653 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1654 goto error;
1655 }
1656
1657skip_rsn:
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001658#ifdef CONFIG_TDLS_TESTING
1659 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
1660 if (os_memcmp(sm->own_addr, peer->addr, ETH_ALEN) < 0) {
1661 /*
1662 * The request frame from us is going to win, so do not
1663 * replace information based on this request frame from
1664 * the peer.
1665 */
1666 goto skip_rsn_check;
1667 }
1668 }
1669#endif /* CONFIG_TDLS_TESTING */
1670
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001671 peer->initiator = 0; /* Need to check */
1672 peer->dtoken = dtoken;
1673
1674 if (!wpa_tdls_get_privacy(sm)) {
1675 peer->rsnie_i_len = 0;
1676 peer->rsnie_p_len = 0;
1677 peer->cipher = WPA_CIPHER_NONE;
1678 goto skip_rsn_check;
1679 }
1680
1681 ftie = (struct wpa_tdls_ftie *) kde.ftie;
1682 os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN);
1683 os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
1684 peer->rsnie_i_len = kde.rsn_ie_len;
1685 peer->cipher = cipher;
1686
1687 if (os_get_random(peer->rnonce, WPA_NONCE_LEN)) {
1688 wpa_msg(sm->ctx->ctx, MSG_WARNING,
1689 "TDLS: Failed to get random data for responder nonce");
1690 wpa_tdls_peer_free(sm, peer);
1691 goto error;
1692 }
1693
1694#if 0
1695 /* get version info from RSNIE received from Peer */
1696 hdr = (struct rsn_ie_hdr *) kde.rsn_ie;
1697 rsn_ver = WPA_GET_LE16(hdr->version);
1698
1699 /* use min(peer's version, out version) */
1700 if (rsn_ver > RSN_VERSION)
1701 rsn_ver = RSN_VERSION;
1702
1703 hdr = (struct rsn_ie_hdr *) peer->rsnie_p;
1704
1705 hdr->elem_id = WLAN_EID_RSN;
1706 WPA_PUT_LE16(hdr->version, rsn_ver);
1707 pos = (u8 *) (hdr + 1);
1708
1709 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
1710 pos += RSN_SELECTOR_LEN;
1711 /* Include only the selected cipher in pairwise cipher suite */
1712 WPA_PUT_LE16(pos, 1);
1713 pos += 2;
1714 if (cipher == WPA_CIPHER_CCMP)
1715 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1716 pos += RSN_SELECTOR_LEN;
1717
1718 WPA_PUT_LE16(pos, 1);
1719 pos += 2;
1720 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
1721 pos += RSN_SELECTOR_LEN;
1722
1723 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1724 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
1725 WPA_PUT_LE16(pos, rsn_capab);
1726 pos += 2;
1727
1728 hdr->len = (pos - peer->rsnie_p) - 2;
1729 peer->rsnie_p_len = pos - peer->rsnie_p;
1730#endif
1731
1732 /* temp fix: validation of RSNIE later */
1733 os_memcpy(peer->rsnie_p, peer->rsnie_i, peer->rsnie_i_len);
1734 peer->rsnie_p_len = peer->rsnie_i_len;
1735
1736 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
1737 peer->rsnie_p, peer->rsnie_p_len);
1738
1739 peer->lifetime = lifetime;
1740
1741 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
1742
1743skip_rsn_check:
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001744 /* add the peer to the driver as a "setup in progress" peer */
Dmitry Shmidt51b6ea82013-05-08 10:42:09 -07001745 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL, NULL, 0,
Dmitry Shmidtf8623282013-02-20 14:34:59 -08001746 NULL, 0);
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001747
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001748 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Response / TPK M2");
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001749 if (wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer) < 0) {
1750 wpa_tdls_disable_link(sm, peer->addr);
1751 goto error;
1752 }
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001753
1754 return 0;
1755
1756error:
1757 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken,
1758 status);
1759 return -1;
1760}
1761
1762
Dmitry Shmidt8da800a2013-04-24 12:57:01 -07001763static int wpa_tdls_enable_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001764{
1765 peer->tpk_success = 1;
1766 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
1767 if (wpa_tdls_get_privacy(sm)) {
1768 u32 lifetime = peer->lifetime;
1769 /*
1770 * Start the initiator process a bit earlier to avoid race
1771 * condition with the responder sending teardown request.
1772 */
1773 if (lifetime > 3 && peer->initiator)
1774 lifetime -= 3;
1775 eloop_register_timeout(lifetime, 0, wpa_tdls_tpk_timeout,
1776 sm, peer);
1777#ifdef CONFIG_TDLS_TESTING
1778 if (tdls_testing & TDLS_TESTING_NO_TPK_EXPIRATION) {
1779 wpa_printf(MSG_DEBUG, "TDLS: Testing - disable TPK "
1780 "expiration");
1781 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
1782 }
1783#endif /* CONFIG_TDLS_TESTING */
1784 }
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001785
Dmitry Shmidtf8623282013-02-20 14:34:59 -08001786 /* add supported rates, capabilities, and qos_info to the TDLS peer */
Dmitry Shmidt51b6ea82013-05-08 10:42:09 -07001787 if (wpa_sm_tdls_peer_addset(sm, peer->addr, 0, peer->aid,
1788 peer->capability,
Dmitry Shmidt8da800a2013-04-24 12:57:01 -07001789 peer->supp_rates, peer->supp_rates_len,
1790 peer->ht_capabilities,
1791 peer->vht_capabilities,
1792 peer->qos_info, peer->ext_capab,
1793 peer->ext_capab_len) < 0)
1794 return -1;
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001795
Dmitry Shmidt8da800a2013-04-24 12:57:01 -07001796 if (peer->reconfig_key && wpa_tdls_set_key(sm, peer) < 0) {
1797 wpa_printf(MSG_INFO, "TDLS: Could not configure key to the "
1798 "driver");
1799 return -1;
1800 }
1801 peer->reconfig_key = 0;
1802
1803 return wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, peer->addr);
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001804}
1805
1806
1807static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
1808 const u8 *buf, size_t len)
1809{
1810 struct wpa_tdls_peer *peer;
1811 struct wpa_eapol_ie_parse kde;
1812 struct wpa_ie_data ie;
1813 int cipher;
1814 struct wpa_tdls_ftie *ftie;
1815 struct wpa_tdls_timeoutie *timeoutie;
1816 struct wpa_tdls_lnkid *lnkid;
1817 u32 lifetime;
1818 u8 dtoken;
1819 int ielen;
1820 u16 status;
1821 const u8 *pos;
Dmitry Shmidt8da800a2013-04-24 12:57:01 -07001822 int ret;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001823
1824 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Response / TPK M2 "
1825 "(Peer " MACSTR ")", MAC2STR(src_addr));
1826 for (peer = sm->tdls; peer; peer = peer->next) {
1827 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
1828 break;
1829 }
1830 if (peer == NULL) {
1831 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
1832 "TPK M2: " MACSTR, MAC2STR(src_addr));
1833 return -1;
1834 }
Dmitry Shmidt0ccb66e2013-03-29 16:41:28 -07001835 if (!peer->initiator) {
1836 /*
1837 * This may happen if both devices try to initiate TDLS at the
1838 * same time and we accept the TPK M1 from the peer in
1839 * wpa_tdls_process_tpk_m1() and clear our previous state.
1840 */
1841 wpa_printf(MSG_INFO, "TDLS: We were not the initiator, so "
1842 "ignore TPK M2 from " MACSTR, MAC2STR(src_addr));
1843 return -1;
1844 }
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001845 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_REQUEST);
1846
1847 if (len < 3 + 2 + 1)
1848 return -1;
1849 pos = buf;
1850 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1851 status = WPA_GET_LE16(pos);
1852 pos += 2 /* status code */;
1853
1854 if (status != WLAN_STATUS_SUCCESS) {
1855 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M2: %u",
1856 status);
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001857 if (sm->tdls_external_setup)
1858 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001859 return -1;
1860 }
1861
1862 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
1863
1864 /* TODO: need to verify dialog token matches here or in kernel */
1865 dtoken = *pos++; /* dialog token */
1866
1867 wpa_printf(MSG_DEBUG, "TDLS: Dialog Token in TPK M2 %d", dtoken);
1868
1869 if (len < 3 + 2 + 1 + 2)
1870 return -1;
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001871
1872 /* capability information */
1873 peer->capability = WPA_GET_LE16(pos);
1874 pos += 2;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001875
1876 ielen = len - (pos - buf); /* start of IE in buf */
1877 if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0) {
1878 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M2");
1879 goto error;
1880 }
1881
1882#ifdef CONFIG_TDLS_TESTING
1883 if (tdls_testing & TDLS_TESTING_DECLINE_RESP) {
1884 wpa_printf(MSG_DEBUG, "TDLS: Testing - decline response");
1885 status = WLAN_STATUS_REQUEST_DECLINED;
1886 goto error;
1887 }
1888#endif /* CONFIG_TDLS_TESTING */
1889
1890 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1891 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
1892 "TPK M2");
1893 goto error;
1894 }
1895 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M2",
1896 kde.lnkid, kde.lnkid_len);
1897 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1898
1899 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1900 wpa_printf(MSG_INFO, "TDLS: TPK M2 from different BSS");
1901 status = WLAN_STATUS_NOT_IN_SAME_BSS;
1902 goto error;
1903 }
1904
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08001905 if (copy_supp_rates(&kde, peer) < 0)
1906 goto error;
1907
Dmitry Shmidtf8623282013-02-20 14:34:59 -08001908 if (copy_peer_ht_capab(&kde, peer) < 0)
1909 goto error;
1910
Dmitry Shmidt33e38bf2013-02-27 12:56:00 -08001911 if (copy_peer_vht_capab(&kde, peer) < 0)
1912 goto error;
1913
Dmitry Shmidtf8623282013-02-20 14:34:59 -08001914 if (copy_peer_ext_capab(&kde, peer) < 0)
1915 goto error;
1916
1917 peer->qos_info = kde.qosinfo;
1918
Dmitry Shmidt51b6ea82013-05-08 10:42:09 -07001919 peer->aid = kde.aid;
1920
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07001921 if (!wpa_tdls_get_privacy(sm)) {
1922 peer->rsnie_p_len = 0;
1923 peer->cipher = WPA_CIPHER_NONE;
1924 goto skip_rsn;
1925 }
1926
1927 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
1928 kde.rsn_ie == NULL) {
1929 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M2");
1930 status = WLAN_STATUS_INVALID_PARAMETERS;
1931 goto error;
1932 }
1933 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
1934 kde.rsn_ie, kde.rsn_ie_len);
1935
1936 /*
1937 * FIX: bitwise comparison of RSN IE is not the correct way of
1938 * validation this. It can be different, but certain fields must
1939 * match. Since we list only a single pairwise cipher in TPK M1, the
1940 * memcmp is likely to work in most cases, though.
1941 */
1942 if (kde.rsn_ie_len != peer->rsnie_i_len ||
1943 os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) != 0) {
1944 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M2 does "
1945 "not match with RSN IE used in TPK M1");
1946 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Sent in TPK M1",
1947 peer->rsnie_i, peer->rsnie_i_len);
1948 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
1949 kde.rsn_ie, kde.rsn_ie_len);
1950 status = WLAN_STATUS_INVALID_RSNIE;
1951 goto error;
1952 }
1953
1954 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
1955 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M2");
1956 status = WLAN_STATUS_INVALID_RSNIE;
1957 goto error;
1958 }
1959
1960 cipher = ie.pairwise_cipher;
1961 if (cipher == WPA_CIPHER_CCMP) {
1962 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
1963 cipher = WPA_CIPHER_CCMP;
1964 } else {
1965 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M2");
1966 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
1967 goto error;
1968 }
1969
1970 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M2",
1971 kde.ftie, sizeof(*ftie));
1972 ftie = (struct wpa_tdls_ftie *) kde.ftie;
1973
1974 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
1975 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does "
1976 "not match with FTIE SNonce used in TPK M1");
1977 /* Silently discard the frame */
1978 return -1;
1979 }
1980
1981 /* Responder Nonce and RSN IE */
1982 os_memcpy(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN);
1983 os_memcpy(peer->rsnie_p, kde.rsn_ie, kde.rsn_ie_len);
1984 peer->rsnie_p_len = kde.rsn_ie_len;
1985 peer->cipher = cipher;
1986
1987 /* Lifetime */
1988 if (kde.key_lifetime == NULL) {
1989 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M2");
1990 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1991 goto error;
1992 }
1993 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
1994 lifetime = WPA_GET_LE32(timeoutie->value);
1995 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M2",
1996 lifetime);
1997 if (lifetime != peer->lifetime) {
1998 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
1999 "TPK M2 (expected %u)", lifetime, peer->lifetime);
2000 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
2001 goto error;
2002 }
2003
2004 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
2005
2006 /* Process MIC check to see if TPK M2 is right */
2007 if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid,
2008 (u8 *) timeoutie, ftie) < 0) {
2009 /* Discard the frame */
2010 wpa_tdls_del_key(sm, peer);
2011 wpa_tdls_peer_free(sm, peer);
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002012 if (sm->tdls_external_setup)
2013 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002014 return -1;
2015 }
2016
Dmitry Shmidt8da800a2013-04-24 12:57:01 -07002017 if (wpa_tdls_set_key(sm, peer) < 0) {
2018 /*
2019 * Some drivers may not be able to config the key prior to full
2020 * STA entry having been configured.
2021 */
2022 wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after "
2023 "STA entry is complete");
2024 peer->reconfig_key = 1;
2025 }
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002026
2027skip_rsn:
2028 peer->dtoken = dtoken;
2029
2030 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Confirm / "
2031 "TPK Handshake Message 3");
2032 wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer);
2033
Dmitry Shmidt8da800a2013-04-24 12:57:01 -07002034 ret = wpa_tdls_enable_link(sm, peer);
2035 if (ret < 0) {
2036 wpa_printf(MSG_DEBUG, "TDLS: Could not enable link");
2037 wpa_tdls_do_teardown(sm, peer,
2038 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1);
2039 }
2040 return ret;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002041
2042error:
2043 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken,
2044 status);
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002045 if (sm->tdls_external_setup)
2046 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002047 return -1;
2048}
2049
2050
2051static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr,
2052 const u8 *buf, size_t len)
2053{
2054 struct wpa_tdls_peer *peer;
2055 struct wpa_eapol_ie_parse kde;
2056 struct wpa_tdls_ftie *ftie;
2057 struct wpa_tdls_timeoutie *timeoutie;
2058 struct wpa_tdls_lnkid *lnkid;
2059 int ielen;
2060 u16 status;
2061 const u8 *pos;
2062 u32 lifetime;
Dmitry Shmidt8da800a2013-04-24 12:57:01 -07002063 int ret;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002064
2065 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Confirm / TPK M3 "
2066 "(Peer " MACSTR ")", MAC2STR(src_addr));
2067 for (peer = sm->tdls; peer; peer = peer->next) {
2068 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
2069 break;
2070 }
2071 if (peer == NULL) {
2072 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
2073 "TPK M3: " MACSTR, MAC2STR(src_addr));
2074 return -1;
2075 }
2076 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_RESPONSE);
2077
2078 if (len < 3 + 3)
2079 return -1;
2080 pos = buf;
2081 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
2082
2083 status = WPA_GET_LE16(pos);
2084
2085 if (status != 0) {
2086 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M3: %u",
2087 status);
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002088 if (sm->tdls_external_setup)
2089 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002090 return -1;
2091 }
2092 pos += 2 /* status code */ + 1 /* dialog token */;
2093
2094 ielen = len - (pos - buf); /* start of IE in buf */
2095 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) {
2096 wpa_printf(MSG_INFO, "TDLS: Failed to parse KDEs in TPK M3");
2097 return -1;
2098 }
2099
2100 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
2101 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M3");
2102 return -1;
2103 }
2104 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M3",
2105 (u8 *) kde.lnkid, kde.lnkid_len);
2106 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
2107
2108 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
2109 wpa_printf(MSG_INFO, "TDLS: TPK M3 from diff BSS");
2110 return -1;
2111 }
2112
2113 if (!wpa_tdls_get_privacy(sm))
2114 goto skip_rsn;
2115
2116 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
2117 wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M3");
2118 return -1;
2119 }
2120 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M3",
2121 kde.ftie, sizeof(*ftie));
2122 ftie = (struct wpa_tdls_ftie *) kde.ftie;
2123
2124 if (kde.rsn_ie == NULL) {
2125 wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M3");
2126 return -1;
2127 }
2128 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M3",
2129 kde.rsn_ie, kde.rsn_ie_len);
2130 if (kde.rsn_ie_len != peer->rsnie_p_len ||
2131 os_memcmp(kde.rsn_ie, peer->rsnie_p, peer->rsnie_p_len) != 0) {
2132 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M3 does not match "
2133 "with the one sent in TPK M2");
2134 return -1;
2135 }
2136
2137 if (!os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) {
2138 wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does "
2139 "not match with FTIE ANonce used in TPK M2");
2140 return -1;
2141 }
2142
2143 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
2144 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M3 does not "
2145 "match with FTIE SNonce used in TPK M1");
2146 return -1;
2147 }
2148
2149 if (kde.key_lifetime == NULL) {
2150 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M3");
2151 return -1;
2152 }
2153 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
2154 wpa_hexdump(MSG_DEBUG, "TDLS: Timeout IE Received from TPK M3",
2155 (u8 *) timeoutie, sizeof(*timeoutie));
2156 lifetime = WPA_GET_LE32(timeoutie->value);
2157 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M3",
2158 lifetime);
2159 if (lifetime != peer->lifetime) {
2160 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
2161 "TPK M3 (expected %u)", lifetime, peer->lifetime);
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002162 if (sm->tdls_external_setup)
2163 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002164 return -1;
2165 }
2166
2167 if (wpa_supplicant_verify_tdls_mic(3, peer, (u8 *) lnkid,
2168 (u8 *) timeoutie, ftie) < 0) {
2169 wpa_tdls_del_key(sm, peer);
2170 wpa_tdls_peer_free(sm, peer);
2171 return -1;
2172 }
2173
Dmitry Shmidt8da800a2013-04-24 12:57:01 -07002174 if (wpa_tdls_set_key(sm, peer) < 0) {
2175 /*
2176 * Some drivers may not be able to config the key prior to full
2177 * STA entry having been configured.
2178 */
2179 wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after "
2180 "STA entry is complete");
2181 peer->reconfig_key = 1;
2182 }
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002183
2184skip_rsn:
Dmitry Shmidt8da800a2013-04-24 12:57:01 -07002185 ret = wpa_tdls_enable_link(sm, peer);
2186 if (ret < 0) {
2187 wpa_printf(MSG_DEBUG, "TDLS: Could not enable link");
2188 wpa_tdls_do_teardown(sm, peer,
2189 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1);
2190 }
2191 return ret;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002192}
2193
2194
2195static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs)
2196{
2197 struct wpa_tdls_timeoutie *lifetime = (struct wpa_tdls_timeoutie *) ie;
2198
2199 os_memset(lifetime, 0, ie_len);
2200 lifetime->ie_type = WLAN_EID_TIMEOUT_INTERVAL;
2201 lifetime->ie_len = sizeof(struct wpa_tdls_timeoutie) - 2;
2202 lifetime->interval_type = WLAN_TIMEOUT_KEY_LIFETIME;
2203 WPA_PUT_LE32(lifetime->value, tsecs);
2204 os_memcpy(pos, ie, ie_len);
2205 return pos + ie_len;
2206}
2207
2208
2209/**
2210 * wpa_tdls_start - Initiate TDLS handshake (send TPK Handshake Message 1)
2211 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2212 * @peer: MAC address of the peer STA
2213 * Returns: 0 on success, or -1 on failure
2214 *
2215 * Send TPK Handshake Message 1 info to driver to start TDLS
2216 * handshake with the peer.
2217 */
2218int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr)
2219{
2220 struct wpa_tdls_peer *peer;
2221 int tdls_prohibited = sm->tdls_prohibited;
2222
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002223 if (sm->tdls_disabled || !sm->tdls_supported)
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002224 return -1;
2225
2226#ifdef CONFIG_TDLS_TESTING
2227 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
2228 tdls_prohibited) {
2229 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
2230 "on TDLS");
2231 tdls_prohibited = 0;
2232 }
2233#endif /* CONFIG_TDLS_TESTING */
2234
2235 if (tdls_prohibited) {
2236 wpa_printf(MSG_DEBUG, "TDLS: TDLS is prohibited in this BSS - "
2237 "reject request to start setup");
2238 return -1;
2239 }
2240
Dmitry Shmidt4b9d52f2013-02-05 17:44:43 -08002241 peer = wpa_tdls_add_peer(sm, addr, NULL);
2242 if (peer == NULL)
2243 return -1;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002244
2245 peer->initiator = 1;
2246
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002247 /* add the peer to the driver as a "setup in progress" peer */
Dmitry Shmidt51b6ea82013-05-08 10:42:09 -07002248 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL, NULL, 0,
Dmitry Shmidtf8623282013-02-20 14:34:59 -08002249 NULL, 0);
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002250
2251 if (wpa_tdls_send_tpk_m1(sm, peer) < 0) {
2252 wpa_tdls_disable_link(sm, peer->addr);
2253 return -1;
2254 }
2255
2256 return 0;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002257}
2258
2259
Dmitry Shmidt4b9d52f2013-02-05 17:44:43 -08002260void wpa_tdls_remove(struct wpa_sm *sm, const u8 *addr)
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002261{
2262 struct wpa_tdls_peer *peer;
2263
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002264 if (sm->tdls_disabled || !sm->tdls_supported)
Dmitry Shmidt4b9d52f2013-02-05 17:44:43 -08002265 return;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002266
2267 for (peer = sm->tdls; peer; peer = peer->next) {
2268 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
2269 break;
2270 }
2271
2272 if (peer == NULL || !peer->tpk_success)
Dmitry Shmidt4b9d52f2013-02-05 17:44:43 -08002273 return;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002274
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002275 if (sm->tdls_external_setup) {
2276 /*
2277 * Disable previous link to allow renegotiation to be completed
2278 * on AP path.
2279 */
2280 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2281 }
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002282}
2283
2284
2285/**
2286 * wpa_supplicant_rx_tdls - Receive TDLS data frame
2287 *
2288 * This function is called to receive TDLS (ethertype = 0x890d) data frames.
2289 */
2290static void wpa_supplicant_rx_tdls(void *ctx, const u8 *src_addr,
2291 const u8 *buf, size_t len)
2292{
2293 struct wpa_sm *sm = ctx;
2294 struct wpa_tdls_frame *tf;
2295
2296 wpa_hexdump(MSG_DEBUG, "TDLS: Received Data frame encapsulation",
2297 buf, len);
2298
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002299 if (sm->tdls_disabled || !sm->tdls_supported) {
2300 wpa_printf(MSG_DEBUG, "TDLS: Discard message - TDLS disabled "
2301 "or unsupported by driver");
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002302 return;
2303 }
2304
2305 if (os_memcmp(src_addr, sm->own_addr, ETH_ALEN) == 0) {
2306 wpa_printf(MSG_DEBUG, "TDLS: Discard copy of own message");
2307 return;
2308 }
2309
2310 if (len < sizeof(*tf)) {
2311 wpa_printf(MSG_INFO, "TDLS: Drop too short frame");
2312 return;
2313 }
2314
2315 /* Check to make sure its a valid encapsulated TDLS frame */
2316 tf = (struct wpa_tdls_frame *) buf;
2317 if (tf->payloadtype != 2 /* TDLS_RFTYPE */ ||
2318 tf->category != WLAN_ACTION_TDLS) {
2319 wpa_printf(MSG_INFO, "TDLS: Invalid frame - payloadtype=%u "
2320 "category=%u action=%u",
2321 tf->payloadtype, tf->category, tf->action);
2322 return;
2323 }
2324
2325 switch (tf->action) {
2326 case WLAN_TDLS_SETUP_REQUEST:
2327 wpa_tdls_process_tpk_m1(sm, src_addr, buf, len);
2328 break;
2329 case WLAN_TDLS_SETUP_RESPONSE:
2330 wpa_tdls_process_tpk_m2(sm, src_addr, buf, len);
2331 break;
2332 case WLAN_TDLS_SETUP_CONFIRM:
2333 wpa_tdls_process_tpk_m3(sm, src_addr, buf, len);
2334 break;
2335 case WLAN_TDLS_TEARDOWN:
2336 wpa_tdls_recv_teardown(sm, src_addr, buf, len);
2337 break;
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002338 case WLAN_TDLS_DISCOVERY_REQUEST:
2339 wpa_tdls_process_discovery_request(sm, src_addr, buf, len);
2340 break;
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002341 default:
2342 /* Kernel code will process remaining frames */
2343 wpa_printf(MSG_DEBUG, "TDLS: Ignore TDLS frame action code %u",
2344 tf->action);
2345 break;
2346 }
2347}
2348
2349
2350/**
2351 * wpa_tdls_init - Initialize driver interface parameters for TDLS
2352 * @wpa_s: Pointer to wpa_supplicant data
2353 * Returns: 0 on success, -1 on failure
2354 *
2355 * This function is called to initialize driver interface parameters for TDLS.
2356 * wpa_drv_init() must have been called before this function to initialize the
2357 * driver interface.
2358 */
2359int wpa_tdls_init(struct wpa_sm *sm)
2360{
2361 if (sm == NULL)
2362 return -1;
2363
Dmitry Shmidt04949592012-07-19 12:16:46 -07002364 sm->l2_tdls = l2_packet_init(sm->bridge_ifname ? sm->bridge_ifname :
2365 sm->ifname,
2366 sm->own_addr,
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002367 ETH_P_80211_ENCAP, wpa_supplicant_rx_tdls,
2368 sm, 0);
2369 if (sm->l2_tdls == NULL) {
2370 wpa_printf(MSG_ERROR, "TDLS: Failed to open l2_packet "
2371 "connection");
2372 return -1;
2373 }
2374
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002375 /*
2376 * Drivers that support TDLS but don't implement the get_capa callback
2377 * are assumed to perform everything internally
2378 */
2379 if (wpa_sm_tdls_get_capa(sm, &sm->tdls_supported,
2380 &sm->tdls_external_setup) < 0) {
2381 sm->tdls_supported = 1;
2382 sm->tdls_external_setup = 0;
2383 }
2384
2385 wpa_printf(MSG_DEBUG, "TDLS: TDLS operation%s supported by "
2386 "driver", sm->tdls_supported ? "" : " not");
2387 wpa_printf(MSG_DEBUG, "TDLS: Driver uses %s link setup",
2388 sm->tdls_external_setup ? "external" : "internal");
2389
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002390 return 0;
2391}
2392
2393
Dmitry Shmidtf8623282013-02-20 14:34:59 -08002394void wpa_tdls_teardown_peers(struct wpa_sm *sm)
2395{
2396 struct wpa_tdls_peer *peer;
2397
2398 peer = sm->tdls;
2399
2400 wpa_printf(MSG_DEBUG, "TDLS: Tear down peers");
2401
2402 while (peer) {
2403 wpa_printf(MSG_DEBUG, "TDLS: Tear down peer " MACSTR,
2404 MAC2STR(peer->addr));
2405 if (sm->tdls_external_setup)
2406 wpa_tdls_send_teardown(sm, peer->addr,
2407 WLAN_REASON_DEAUTH_LEAVING);
2408 else
2409 wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr);
2410
2411 peer = peer->next;
2412 }
2413}
2414
2415
Dmitry Shmidt8d520ff2011-05-09 14:06:53 -07002416static void wpa_tdls_remove_peers(struct wpa_sm *sm)
2417{
2418 struct wpa_tdls_peer *peer, *tmp;
2419
2420 peer = sm->tdls;
2421 sm->tdls = NULL;
2422
2423 while (peer) {
2424 int res;
2425 tmp = peer->next;
2426 res = wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2427 wpa_printf(MSG_DEBUG, "TDLS: Remove peer " MACSTR " (res=%d)",
2428 MAC2STR(peer->addr), res);
2429 wpa_tdls_peer_free(sm, peer);
2430 os_free(peer);
2431 peer = tmp;
2432 }
2433}
2434
2435
2436/**
2437 * wpa_tdls_deinit - Deinitialize driver interface parameters for TDLS
2438 *
2439 * This function is called to recover driver interface parameters for TDLS
2440 * and frees resources allocated for it.
2441 */
2442void wpa_tdls_deinit(struct wpa_sm *sm)
2443{
2444 if (sm == NULL)
2445 return;
2446
2447 if (sm->l2_tdls)
2448 l2_packet_deinit(sm->l2_tdls);
2449 sm->l2_tdls = NULL;
2450
2451 wpa_tdls_remove_peers(sm);
2452}
2453
2454
2455void wpa_tdls_assoc(struct wpa_sm *sm)
2456{
2457 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on association");
2458 wpa_tdls_remove_peers(sm);
2459}
2460
2461
2462void wpa_tdls_disassoc(struct wpa_sm *sm)
2463{
2464 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on disassociation");
2465 wpa_tdls_remove_peers(sm);
2466}
2467
2468
2469static int wpa_tdls_prohibited(const u8 *ies, size_t len)
2470{
2471 struct wpa_eapol_ie_parse elems;
2472
2473 if (ies == NULL)
2474 return 0;
2475
2476 if (wpa_supplicant_parse_ies(ies, len, &elems) < 0)
2477 return 0;
2478
2479 if (elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5)
2480 return 0;
2481
2482 /* bit 38 - TDLS Prohibited */
2483 return !!(elems.ext_capab[2 + 4] & 0x40);
2484}
2485
2486
2487void wpa_tdls_ap_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2488{
2489 sm->tdls_prohibited = wpa_tdls_prohibited(ies, len);
2490 wpa_printf(MSG_DEBUG, "TDLS: TDLS is %s in the target BSS",
2491 sm->tdls_prohibited ? "prohibited" : "allowed");
2492}
2493
2494
2495void wpa_tdls_assoc_resp_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2496{
2497 if (!sm->tdls_prohibited && wpa_tdls_prohibited(ies, len)) {
2498 wpa_printf(MSG_DEBUG, "TDLS: TDLS prohibited based on "
2499 "(Re)Association Response IEs");
2500 sm->tdls_prohibited = 1;
2501 }
2502}
2503
2504
2505void wpa_tdls_enable(struct wpa_sm *sm, int enabled)
2506{
2507 wpa_printf(MSG_DEBUG, "TDLS: %s", enabled ? "enabled" : "disabled");
2508 sm->tdls_disabled = !enabled;
2509}
Dmitry Shmidt1f69aa52012-01-24 16:10:04 -08002510
2511
2512int wpa_tdls_is_external_setup(struct wpa_sm *sm)
2513{
2514 return sm->tdls_external_setup;
2515}