1 /*
2 * wpa_supplicant - TDLS
3 * Copyright (c) 2010-2011, Atheros Communications
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "utils/os.h"
14 #include "common/ieee802_11_defs.h"
15 #include "crypto/sha256.h"
16 #include "crypto/crypto.h"
17 #include "crypto/aes_wrap.h"
18 #include "rsn_supp/wpa.h"
19 #include "rsn_supp/wpa_ie.h"
20 #include "rsn_supp/wpa_i.h"
21 #include "drivers/driver.h"
22 #include "l2_packet/l2_packet.h"
23
24 #ifdef CONFIG_TDLS_TESTING
25 #define TDLS_TESTING_LONG_FRAME BIT(0)
26 #define TDLS_TESTING_ALT_RSN_IE BIT(1)
27 #define TDLS_TESTING_DIFF_BSSID BIT(2)
28 #define TDLS_TESTING_SHORT_LIFETIME BIT(3)
29 #define TDLS_TESTING_WRONG_LIFETIME_RESP BIT(4)
30 #define TDLS_TESTING_WRONG_LIFETIME_CONF BIT(5)
31 #define TDLS_TESTING_LONG_LIFETIME BIT(6)
32 #define TDLS_TESTING_CONCURRENT_INIT BIT(7)
33 #define TDLS_TESTING_NO_TPK_EXPIRATION BIT(8)
34 #define TDLS_TESTING_DECLINE_RESP BIT(9)
35 #define TDLS_TESTING_IGNORE_AP_PROHIBIT BIT(10)
36 unsigned int tdls_testing = 0;
37 #endif /* CONFIG_TDLS_TESTING */
38
39 #define TPK_LIFETIME 43200 /* 12 hours */
40 #define TPK_RETRY_COUNT 3
41 #define TPK_TIMEOUT 5000 /* in milliseconds */
42
43 #define TDLS_MIC_LEN 16
44
45 #define TDLS_TIMEOUT_LEN 4
46
47 struct wpa_tdls_ftie {
48 u8 ie_type; /* FTIE */
49 u8 ie_len;
50 u8 mic_ctrl[2];
51 u8 mic[TDLS_MIC_LEN];
52 u8 Anonce[WPA_NONCE_LEN]; /* Responder Nonce in TDLS */
53 u8 Snonce[WPA_NONCE_LEN]; /* Initiator Nonce in TDLS */
54 /* followed by optional elements */
55 } STRUCT_PACKED;
56
57 struct wpa_tdls_timeoutie {
58 u8 ie_type; /* Timeout IE */
59 u8 ie_len;
60 u8 interval_type;
61 u8 value[TDLS_TIMEOUT_LEN];
62 } STRUCT_PACKED;
63
64 struct wpa_tdls_lnkid {
65 u8 ie_type; /* Link Identifier IE */
66 u8 ie_len;
67 u8 bssid[ETH_ALEN];
68 u8 init_sta[ETH_ALEN];
69 u8 resp_sta[ETH_ALEN];
70 } STRUCT_PACKED;
71
72 /* TDLS frame headers as per IEEE Std 802.11z-2010 */
73 struct wpa_tdls_frame {
74 u8 payloadtype; /* IEEE80211_TDLS_RFTYPE */
75 u8 category; /* Category */
76 u8 action; /* Action (enum tdls_frame_type) */
77 } STRUCT_PACKED;
78
79 static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs);
80 static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx);
81 static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer);
82
83
84 #define TDLS_MAX_IE_LEN 80
85 #define IEEE80211_MAX_SUPP_RATES 32
86
87 struct wpa_tdls_peer {
88 struct wpa_tdls_peer *next;
89 int initiator; /* whether this end was initiator for TDLS setup */
90 u8 addr[ETH_ALEN]; /* other end MAC address */
91 u8 inonce[WPA_NONCE_LEN]; /* Initiator Nonce */
92 u8 rnonce[WPA_NONCE_LEN]; /* Responder Nonce */
93 u8 rsnie_i[TDLS_MAX_IE_LEN]; /* Initiator RSN IE */
94 size_t rsnie_i_len;
95 u8 rsnie_p[TDLS_MAX_IE_LEN]; /* Peer RSN IE */
96 size_t rsnie_p_len;
97 u32 lifetime;
98 int cipher; /* Selected cipher (WPA_CIPHER_*) */
99 u8 dtoken;
100
101 struct tpk {
102 u8 kck[16]; /* TPK-KCK */
103 u8 tk[16]; /* TPK-TK; assuming only CCMP will be used */
104 } tpk;
105 int tpk_set;
106 int tk_set; /* TPK-TK configured to the driver */
107 int tpk_success;
108
109 struct tpk_timer {
110 u8 dest[ETH_ALEN];
111 int count; /* Retry Count */
112 int timer; /* Timeout in milliseconds */
113 u8 action_code; /* TDLS frame type */
114 u8 dialog_token;
115 u16 status_code;
116 int buf_len; /* length of TPK message for retransmission */
117 u8 *buf; /* buffer for TPK message */
118 } sm_tmr;
119
120 u16 capability;
121
122 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
123 size_t supp_rates_len;
124 };
125
126
wpa_tdls_get_privacy(struct wpa_sm * sm)127 static int wpa_tdls_get_privacy(struct wpa_sm *sm)
128 {
129 /*
130 * Get info needed from supplicant to check if the current BSS supports
131 * security. Other than OPEN mode, rest are considered secured
132 * WEP/WPA/WPA2 hence TDLS frames are processed for TPK handshake.
133 */
134 return sm->pairwise_cipher != WPA_CIPHER_NONE;
135 }
136
137
wpa_add_ie(u8 * pos,const u8 * ie,size_t ie_len)138 static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len)
139 {
140 os_memcpy(pos, ie, ie_len);
141 return pos + ie_len;
142 }
143
144
wpa_tdls_del_key(struct wpa_sm * sm,struct wpa_tdls_peer * peer)145 static int wpa_tdls_del_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
146 {
147 if (wpa_sm_set_key(sm, WPA_ALG_NONE, peer->addr,
148 0, 0, NULL, 0, NULL, 0) < 0) {
149 wpa_printf(MSG_WARNING, "TDLS: Failed to delete TPK-TK from "
150 "the driver");
151 return -1;
152 }
153
154 return 0;
155 }
156
157
wpa_tdls_set_key(struct wpa_sm * sm,struct wpa_tdls_peer * peer)158 static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
159 {
160 u8 key_len;
161 u8 rsc[6];
162 enum wpa_alg alg;
163
164 if (peer->tk_set) {
165 /*
166 * This same TPK-TK has already been configured to the driver
167 * and this new configuration attempt (likely due to an
168 * unexpected retransmitted frame) would result in clearing
169 * the TX/RX sequence number which can break security, so must
170 * not allow that to happen.
171 */
172 wpa_printf(MSG_INFO, "TDLS: TPK-TK for the peer " MACSTR
173 " has already been configured to the driver - do not reconfigure",
174 MAC2STR(peer->addr));
175 return -1;
176 }
177
178 os_memset(rsc, 0, 6);
179
180 switch (peer->cipher) {
181 case WPA_CIPHER_CCMP:
182 alg = WPA_ALG_CCMP;
183 key_len = 16;
184 break;
185 case WPA_CIPHER_NONE:
186 wpa_printf(MSG_DEBUG, "TDLS: Pairwise Cipher Suite: "
187 "NONE - do not use pairwise keys");
188 return -1;
189 default:
190 wpa_printf(MSG_WARNING, "TDLS: Unsupported pairwise cipher %d",
191 sm->pairwise_cipher);
192 return -1;
193 }
194
195 wpa_printf(MSG_DEBUG, "TDLS: Configure pairwise key for peer " MACSTR,
196 MAC2STR(peer->addr));
197 if (wpa_sm_set_key(sm, alg, peer->addr, -1, 1,
198 rsc, sizeof(rsc), peer->tpk.tk, key_len) < 0) {
199 wpa_printf(MSG_WARNING, "TDLS: Failed to set TPK to the "
200 "driver");
201 return -1;
202 }
203 peer->tk_set = 1;
204 return 0;
205 }
206
207
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)208 static int wpa_tdls_send_tpk_msg(struct wpa_sm *sm, const u8 *dst,
209 u8 action_code, u8 dialog_token,
210 u16 status_code, const u8 *buf, size_t len)
211 {
212 return wpa_sm_send_tdls_mgmt(sm, dst, action_code, dialog_token,
213 status_code, buf, len);
214 }
215
216
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)217 static int wpa_tdls_tpk_send(struct wpa_sm *sm, const u8 *dest, u8 action_code,
218 u8 dialog_token, u16 status_code,
219 const u8 *msg, size_t msg_len)
220 {
221 struct wpa_tdls_peer *peer;
222
223 wpa_printf(MSG_DEBUG, "TDLS: TPK send dest=" MACSTR " action_code=%u "
224 "dialog_token=%u status_code=%u msg_len=%u",
225 MAC2STR(dest), action_code, dialog_token, status_code,
226 (unsigned int) msg_len);
227
228 if (wpa_tdls_send_tpk_msg(sm, dest, action_code, dialog_token,
229 status_code, msg, msg_len)) {
230 wpa_printf(MSG_INFO, "TDLS: Failed to send message "
231 "(action_code=%u)", action_code);
232 return -1;
233 }
234
235 if (action_code == WLAN_TDLS_SETUP_CONFIRM ||
236 action_code == WLAN_TDLS_TEARDOWN ||
237 action_code == WLAN_TDLS_DISCOVERY_REQUEST ||
238 action_code == WLAN_TDLS_DISCOVERY_RESPONSE)
239 return 0; /* No retries */
240
241 for (peer = sm->tdls; peer; peer = peer->next) {
242 if (os_memcmp(peer->addr, dest, ETH_ALEN) == 0)
243 break;
244 }
245
246 if (peer == NULL) {
247 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
248 "retry " MACSTR, MAC2STR(dest));
249 return 0;
250 }
251
252 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
253
254 peer->sm_tmr.count = TPK_RETRY_COUNT;
255 peer->sm_tmr.timer = TPK_TIMEOUT;
256
257 /* Copy message to resend on timeout */
258 os_memcpy(peer->sm_tmr.dest, dest, ETH_ALEN);
259 peer->sm_tmr.action_code = action_code;
260 peer->sm_tmr.dialog_token = dialog_token;
261 peer->sm_tmr.status_code = status_code;
262 peer->sm_tmr.buf_len = msg_len;
263 os_free(peer->sm_tmr.buf);
264 peer->sm_tmr.buf = os_malloc(msg_len);
265 if (peer->sm_tmr.buf == NULL)
266 return -1;
267 os_memcpy(peer->sm_tmr.buf, msg, msg_len);
268
269 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout registered "
270 "(action_code=%u)", action_code);
271 eloop_register_timeout(peer->sm_tmr.timer / 1000, 0,
272 wpa_tdls_tpk_retry_timeout, sm, peer);
273 return 0;
274 }
275
276
wpa_tdls_do_teardown(struct wpa_sm * sm,struct wpa_tdls_peer * peer,u16 reason_code,int free_peer)277 static int wpa_tdls_do_teardown(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
278 u16 reason_code, int free_peer)
279 {
280 int ret;
281
282 if (sm->tdls_external_setup) {
283 ret = wpa_tdls_send_teardown(sm, peer->addr, reason_code);
284
285 /* disable the link after teardown was sent */
286 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
287 } else {
288 ret = wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr);
289 }
290
291 if (sm->tdls_external_setup || free_peer)
292 wpa_tdls_peer_free(sm, peer);
293
294 return ret;
295 }
296
297
wpa_tdls_tpk_retry_timeout(void * eloop_ctx,void * timeout_ctx)298 static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx)
299 {
300
301 struct wpa_sm *sm = eloop_ctx;
302 struct wpa_tdls_peer *peer = timeout_ctx;
303
304 if (peer->sm_tmr.count) {
305 peer->sm_tmr.count--;
306 peer->sm_tmr.timer = TPK_TIMEOUT;
307
308 wpa_printf(MSG_INFO, "TDLS: Retrying sending of message "
309 "(action_code=%u)",
310 peer->sm_tmr.action_code);
311
312 if (peer->sm_tmr.buf == NULL) {
313 wpa_printf(MSG_INFO, "TDLS: No retry buffer available "
314 "for action_code=%u",
315 peer->sm_tmr.action_code);
316 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm,
317 peer);
318 return;
319 }
320
321 /* resend TPK Handshake Message to Peer */
322 if (wpa_tdls_send_tpk_msg(sm, peer->sm_tmr.dest,
323 peer->sm_tmr.action_code,
324 peer->sm_tmr.dialog_token,
325 peer->sm_tmr.status_code,
326 peer->sm_tmr.buf,
327 peer->sm_tmr.buf_len)) {
328 wpa_printf(MSG_INFO, "TDLS: Failed to retry "
329 "transmission");
330 }
331
332 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
333 eloop_register_timeout(peer->sm_tmr.timer / 1000, 0,
334 wpa_tdls_tpk_retry_timeout, sm, peer);
335 } else {
336 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
337
338 wpa_printf(MSG_DEBUG, "TDLS: Sending Teardown Request");
339 wpa_tdls_do_teardown(sm, peer,
340 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1);
341 }
342 }
343
344
wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm * sm,struct wpa_tdls_peer * peer,u8 action_code)345 static void wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm *sm,
346 struct wpa_tdls_peer *peer,
347 u8 action_code)
348 {
349 if (action_code == peer->sm_tmr.action_code) {
350 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout cancelled for "
351 "action_code=%u", action_code);
352
353 /* Cancel Timeout registered */
354 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
355
356 /* free all resources meant for retry */
357 os_free(peer->sm_tmr.buf);
358 peer->sm_tmr.buf = NULL;
359
360 peer->sm_tmr.count = 0;
361 peer->sm_tmr.timer = 0;
362 peer->sm_tmr.buf_len = 0;
363 peer->sm_tmr.action_code = 0xff;
364 } else {
365 wpa_printf(MSG_INFO, "TDLS: Error in cancelling retry timeout "
366 "(Unknown action_code=%u)", action_code);
367 }
368 }
369
370
wpa_tdls_generate_tpk(struct wpa_tdls_peer * peer,const u8 * own_addr,const u8 * bssid)371 static void wpa_tdls_generate_tpk(struct wpa_tdls_peer *peer,
372 const u8 *own_addr, const u8 *bssid)
373 {
374 u8 key_input[SHA256_MAC_LEN];
375 const u8 *nonce[2];
376 size_t len[2];
377 u8 data[3 * ETH_ALEN];
378
379 /* IEEE Std 802.11z-2010 8.5.9.1:
380 * TPK-Key-Input = SHA-256(min(SNonce, ANonce) || max(SNonce, ANonce))
381 */
382 len[0] = WPA_NONCE_LEN;
383 len[1] = WPA_NONCE_LEN;
384 if (os_memcmp(peer->inonce, peer->rnonce, WPA_NONCE_LEN) < 0) {
385 nonce[0] = peer->inonce;
386 nonce[1] = peer->rnonce;
387 } else {
388 nonce[0] = peer->rnonce;
389 nonce[1] = peer->inonce;
390 }
391 wpa_hexdump(MSG_DEBUG, "TDLS: min(Nonce)", nonce[0], WPA_NONCE_LEN);
392 wpa_hexdump(MSG_DEBUG, "TDLS: max(Nonce)", nonce[1], WPA_NONCE_LEN);
393 sha256_vector(2, nonce, len, key_input);
394 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-Key-Input",
395 key_input, SHA256_MAC_LEN);
396
397 /*
398 * TPK-Key-Data = KDF-N_KEY(TPK-Key-Input, "TDLS PMK",
399 * min(MAC_I, MAC_R) || max(MAC_I, MAC_R) || BSSID || N_KEY)
400 * TODO: is N_KEY really included in KDF Context and if so, in which
401 * presentation format (little endian 16-bit?) is it used? It gets
402 * added by the KDF anyway..
403 */
404
405 if (os_memcmp(own_addr, peer->addr, ETH_ALEN) < 0) {
406 os_memcpy(data, own_addr, ETH_ALEN);
407 os_memcpy(data + ETH_ALEN, peer->addr, ETH_ALEN);
408 } else {
409 os_memcpy(data, peer->addr, ETH_ALEN);
410 os_memcpy(data + ETH_ALEN, own_addr, ETH_ALEN);
411 }
412 os_memcpy(data + 2 * ETH_ALEN, bssid, ETH_ALEN);
413 wpa_hexdump(MSG_DEBUG, "TDLS: KDF Context", data, sizeof(data));
414
415 sha256_prf(key_input, SHA256_MAC_LEN, "TDLS PMK", data, sizeof(data),
416 (u8 *) &peer->tpk, sizeof(peer->tpk));
417 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-KCK",
418 peer->tpk.kck, sizeof(peer->tpk.kck));
419 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-TK",
420 peer->tpk.tk, sizeof(peer->tpk.tk));
421 peer->tpk_set = 1;
422 }
423
424
425 /**
426 * wpa_tdls_ftie_mic - Calculate TDLS FTIE MIC
427 * @kck: TPK-KCK
428 * @lnkid: Pointer to the beginning of Link Identifier IE
429 * @rsnie: Pointer to the beginning of RSN IE used for handshake
430 * @timeoutie: Pointer to the beginning of Timeout IE used for handshake
431 * @ftie: Pointer to the beginning of FT IE
432 * @mic: Pointer for writing MIC
433 *
434 * Calculate MIC for TDLS frame.
435 */
wpa_tdls_ftie_mic(const u8 * kck,u8 trans_seq,const u8 * lnkid,const u8 * rsnie,const u8 * timeoutie,const u8 * ftie,u8 * mic)436 static int wpa_tdls_ftie_mic(const u8 *kck, u8 trans_seq, const u8 *lnkid,
437 const u8 *rsnie, const u8 *timeoutie,
438 const u8 *ftie, u8 *mic)
439 {
440 u8 *buf, *pos;
441 struct wpa_tdls_ftie *_ftie;
442 const struct wpa_tdls_lnkid *_lnkid;
443 int ret;
444 int len = 2 * ETH_ALEN + 1 + 2 + lnkid[1] + 2 + rsnie[1] +
445 2 + timeoutie[1] + 2 + ftie[1];
446 buf = os_zalloc(len);
447 if (!buf) {
448 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
449 return -1;
450 }
451
452 pos = buf;
453 _lnkid = (const struct wpa_tdls_lnkid *) lnkid;
454 /* 1) TDLS initiator STA MAC address */
455 os_memcpy(pos, _lnkid->init_sta, ETH_ALEN);
456 pos += ETH_ALEN;
457 /* 2) TDLS responder STA MAC address */
458 os_memcpy(pos, _lnkid->resp_sta, ETH_ALEN);
459 pos += ETH_ALEN;
460 /* 3) Transaction Sequence number */
461 *pos++ = trans_seq;
462 /* 4) Link Identifier IE */
463 os_memcpy(pos, lnkid, 2 + lnkid[1]);
464 pos += 2 + lnkid[1];
465 /* 5) RSN IE */
466 os_memcpy(pos, rsnie, 2 + rsnie[1]);
467 pos += 2 + rsnie[1];
468 /* 6) Timeout Interval IE */
469 os_memcpy(pos, timeoutie, 2 + timeoutie[1]);
470 pos += 2 + timeoutie[1];
471 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
472 os_memcpy(pos, ftie, 2 + ftie[1]);
473 _ftie = (struct wpa_tdls_ftie *) pos;
474 os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
475 pos += 2 + ftie[1];
476
477 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
478 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
479 ret = omac1_aes_128(kck, buf, pos - buf, mic);
480 os_free(buf);
481 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
482 return ret;
483 }
484
485
486 /**
487 * wpa_tdls_key_mic_teardown - Calculate TDLS FTIE MIC for Teardown frame
488 * @kck: TPK-KCK
489 * @trans_seq: Transaction Sequence Number (4 - Teardown)
490 * @rcode: Reason code for Teardown
491 * @dtoken: Dialog Token used for that particular link
492 * @lnkid: Pointer to the beginning of Link Identifier IE
493 * @ftie: Pointer to the beginning of FT IE
494 * @mic: Pointer for writing MIC
495 *
496 * Calculate MIC for TDLS frame.
497 */
wpa_tdls_key_mic_teardown(const u8 * kck,u8 trans_seq,u16 rcode,u8 dtoken,const u8 * lnkid,const u8 * ftie,u8 * mic)498 static int wpa_tdls_key_mic_teardown(const u8 *kck, u8 trans_seq, u16 rcode,
499 u8 dtoken, const u8 *lnkid,
500 const u8 *ftie, u8 *mic)
501 {
502 u8 *buf, *pos;
503 struct wpa_tdls_ftie *_ftie;
504 int ret;
505 int len;
506
507 if (lnkid == NULL)
508 return -1;
509
510 len = 2 + lnkid[1] + sizeof(rcode) + sizeof(dtoken) +
511 sizeof(trans_seq) + 2 + ftie[1];
512
513 buf = os_zalloc(len);
514 if (!buf) {
515 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
516 return -1;
517 }
518
519 pos = buf;
520 /* 1) Link Identifier IE */
521 os_memcpy(pos, lnkid, 2 + lnkid[1]);
522 pos += 2 + lnkid[1];
523 /* 2) Reason Code */
524 WPA_PUT_LE16(pos, rcode);
525 pos += sizeof(rcode);
526 /* 3) Dialog token */
527 *pos++ = dtoken;
528 /* 4) Transaction Sequence number */
529 *pos++ = trans_seq;
530 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
531 os_memcpy(pos, ftie, 2 + ftie[1]);
532 _ftie = (struct wpa_tdls_ftie *) pos;
533 os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
534 pos += 2 + ftie[1];
535
536 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
537 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
538 ret = omac1_aes_128(kck, buf, pos - buf, mic);
539 os_free(buf);
540 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
541 return ret;
542 }
543
544
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)545 static int wpa_supplicant_verify_tdls_mic(u8 trans_seq,
546 struct wpa_tdls_peer *peer,
547 const u8 *lnkid, const u8 *timeoutie,
548 const struct wpa_tdls_ftie *ftie)
549 {
550 u8 mic[16];
551
552 if (peer->tpk_set) {
553 wpa_tdls_ftie_mic(peer->tpk.kck, trans_seq, lnkid,
554 peer->rsnie_p, timeoutie, (u8 *) ftie,
555 mic);
556 if (os_memcmp(mic, ftie->mic, 16) != 0) {
557 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in FTIE - "
558 "dropping packet");
559 wpa_hexdump(MSG_DEBUG, "TDLS: Received MIC",
560 ftie->mic, 16);
561 wpa_hexdump(MSG_DEBUG, "TDLS: Calculated MIC",
562 mic, 16);
563 return -1;
564 }
565 } else {
566 wpa_printf(MSG_WARNING, "TDLS: Could not verify TDLS MIC, "
567 "TPK not set - dropping packet");
568 return -1;
569 }
570 return 0;
571 }
572
573
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)574 static int wpa_supplicant_verify_tdls_mic_teardown(
575 u8 trans_seq, u16 rcode, u8 dtoken, struct wpa_tdls_peer *peer,
576 const u8 *lnkid, const struct wpa_tdls_ftie *ftie)
577 {
578 u8 mic[16];
579
580 if (peer->tpk_set) {
581 wpa_tdls_key_mic_teardown(peer->tpk.kck, trans_seq, rcode,
582 dtoken, lnkid, (u8 *) ftie, mic);
583 if (os_memcmp(mic, ftie->mic, 16) != 0) {
584 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in Teardown - "
585 "dropping packet");
586 return -1;
587 }
588 } else {
589 wpa_printf(MSG_INFO, "TDLS: Could not verify TDLS Teardown "
590 "MIC, TPK not set - dropping packet");
591 return -1;
592 }
593 return 0;
594 }
595
596
wpa_tdls_tpk_timeout(void * eloop_ctx,void * timeout_ctx)597 static void wpa_tdls_tpk_timeout(void *eloop_ctx, void *timeout_ctx)
598 {
599 struct wpa_sm *sm = eloop_ctx;
600 struct wpa_tdls_peer *peer = timeout_ctx;
601
602 /*
603 * On TPK lifetime expiration, we have an option of either tearing down
604 * the direct link or trying to re-initiate it. The selection of what
605 * to do is not strictly speaking controlled by our role in the expired
606 * link, but for now, use that to select whether to renew or tear down
607 * the link.
608 */
609
610 if (peer->initiator) {
611 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
612 " - try to renew", MAC2STR(peer->addr));
613 wpa_tdls_start(sm, peer->addr);
614 } else {
615 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
616 " - tear down", MAC2STR(peer->addr));
617 wpa_tdls_do_teardown(sm, peer,
618 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1);
619 }
620 }
621
622
wpa_tdls_peer_free(struct wpa_sm * sm,struct wpa_tdls_peer * peer)623 static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
624 {
625 wpa_printf(MSG_DEBUG, "TDLS: Clear state for peer " MACSTR,
626 MAC2STR(peer->addr));
627 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
628 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
629 peer->initiator = 0;
630 os_free(peer->sm_tmr.buf);
631 peer->sm_tmr.buf = NULL;
632 peer->rsnie_i_len = peer->rsnie_p_len = 0;
633 peer->cipher = 0;
634 peer->tk_set = peer->tpk_set = peer->tpk_success = 0;
635 os_memset(&peer->tpk, 0, sizeof(peer->tpk));
636 os_memset(peer->inonce, 0, WPA_NONCE_LEN);
637 os_memset(peer->rnonce, 0, WPA_NONCE_LEN);
638 }
639
640
wpa_tdls_linkid(struct wpa_sm * sm,struct wpa_tdls_peer * peer,struct wpa_tdls_lnkid * lnkid)641 static void wpa_tdls_linkid(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
642 struct wpa_tdls_lnkid *lnkid)
643 {
644 lnkid->ie_type = WLAN_EID_LINK_ID;
645 lnkid->ie_len = 3 * ETH_ALEN;
646 os_memcpy(lnkid->bssid, sm->bssid, ETH_ALEN);
647 if (peer->initiator) {
648 os_memcpy(lnkid->init_sta, sm->own_addr, ETH_ALEN);
649 os_memcpy(lnkid->resp_sta, peer->addr, ETH_ALEN);
650 } else {
651 os_memcpy(lnkid->init_sta, peer->addr, ETH_ALEN);
652 os_memcpy(lnkid->resp_sta, sm->own_addr, ETH_ALEN);
653 }
654 }
655
656
wpa_tdls_send_teardown(struct wpa_sm * sm,const u8 * addr,u16 reason_code)657 int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr, u16 reason_code)
658 {
659 struct wpa_tdls_peer *peer;
660 struct wpa_tdls_ftie *ftie;
661 struct wpa_tdls_lnkid lnkid;
662 u8 dialog_token;
663 u8 *rbuf, *pos;
664 int ielen;
665
666 if (sm->tdls_disabled || !sm->tdls_supported)
667 return -1;
668
669 /* Find the node and free from the list */
670 for (peer = sm->tdls; peer; peer = peer->next) {
671 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
672 break;
673 }
674
675 if (peer == NULL) {
676 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
677 "Teardown " MACSTR, MAC2STR(addr));
678 return 0;
679 }
680
681 dialog_token = peer->dtoken;
682
683 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown for " MACSTR,
684 MAC2STR(addr));
685
686 ielen = 0;
687 if (wpa_tdls_get_privacy(sm) && peer->tpk_set && peer->tpk_success) {
688 /* To add FTIE for Teardown request and compute MIC */
689 ielen += sizeof(*ftie);
690 #ifdef CONFIG_TDLS_TESTING
691 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
692 ielen += 170;
693 #endif /* CONFIG_TDLS_TESTING */
694 }
695
696 rbuf = os_zalloc(ielen + 1);
697 if (rbuf == NULL)
698 return -1;
699 pos = rbuf;
700
701 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success)
702 goto skip_ies;
703
704 ftie = (struct wpa_tdls_ftie *) pos;
705 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
706 /* Using the recent nonce which should be for CONFIRM frame */
707 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
708 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
709 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
710 pos = (u8 *) (ftie + 1);
711 #ifdef CONFIG_TDLS_TESTING
712 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
713 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
714 "FTIE");
715 ftie->ie_len += 170;
716 *pos++ = 255; /* FTIE subelem */
717 *pos++ = 168; /* FTIE subelem length */
718 pos += 168;
719 }
720 #endif /* CONFIG_TDLS_TESTING */
721 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TDLS Teardown handshake",
722 (u8 *) ftie, pos - (u8 *) ftie);
723
724 /* compute MIC before sending */
725 wpa_tdls_linkid(sm, peer, &lnkid);
726 wpa_tdls_key_mic_teardown(peer->tpk.kck, 4, reason_code,
727 dialog_token, (u8 *) &lnkid, (u8 *) ftie,
728 ftie->mic);
729
730 skip_ies:
731 /* TODO: register for a Timeout handler, if Teardown is not received at
732 * the other end, then try again another time */
733
734 /* request driver to send Teardown using this FTIE */
735 wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_TEARDOWN, 0,
736 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, rbuf,
737 pos - rbuf);
738 os_free(rbuf);
739
740 /* clear the Peerkey statemachine */
741 wpa_tdls_peer_free(sm, peer);
742
743 return 0;
744 }
745
746
wpa_tdls_teardown_link(struct wpa_sm * sm,const u8 * addr,u16 reason_code)747 int wpa_tdls_teardown_link(struct wpa_sm *sm, const u8 *addr, u16 reason_code)
748 {
749 struct wpa_tdls_peer *peer;
750
751 if (sm->tdls_disabled || !sm->tdls_supported)
752 return -1;
753
754 for (peer = sm->tdls; peer; peer = peer->next) {
755 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
756 break;
757 }
758
759 if (peer == NULL) {
760 wpa_printf(MSG_DEBUG, "TDLS: Could not find peer " MACSTR
761 " for link Teardown", MAC2STR(addr));
762 return -1;
763 }
764
765 if (!peer->tpk_success) {
766 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR
767 " not connected - cannot Teardown link", MAC2STR(addr));
768 return -1;
769 }
770
771 return wpa_tdls_do_teardown(sm, peer, reason_code, 0);
772 }
773
774
wpa_tdls_disable_link(struct wpa_sm * sm,const u8 * addr)775 void wpa_tdls_disable_link(struct wpa_sm *sm, const u8 *addr)
776 {
777 struct wpa_tdls_peer *peer;
778
779 for (peer = sm->tdls; peer; peer = peer->next) {
780 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
781 break;
782 }
783
784 if (peer) {
785 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, addr);
786 wpa_tdls_peer_free(sm, peer);
787 }
788 }
789
790
wpa_tdls_recv_teardown(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)791 static int wpa_tdls_recv_teardown(struct wpa_sm *sm, const u8 *src_addr,
792 const u8 *buf, size_t len)
793 {
794 struct wpa_tdls_peer *peer = NULL;
795 struct wpa_tdls_ftie *ftie;
796 struct wpa_tdls_lnkid *lnkid;
797 struct wpa_eapol_ie_parse kde;
798 u16 reason_code;
799 const u8 *pos;
800 int ielen;
801
802 /* Find the node and free from the list */
803 for (peer = sm->tdls; peer; peer = peer->next) {
804 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
805 break;
806 }
807
808 if (peer == NULL) {
809 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
810 "Teardown " MACSTR, MAC2STR(src_addr));
811 return 0;
812 }
813
814 pos = buf;
815 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
816
817 reason_code = WPA_GET_LE16(pos);
818 pos += 2;
819
820 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown Request from " MACSTR
821 " (reason code %u)", MAC2STR(src_addr), reason_code);
822
823 ielen = len - (pos - buf); /* start of IE in buf */
824 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) {
825 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in Teardown");
826 return -1;
827 }
828
829 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
830 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TDLS "
831 "Teardown");
832 return -1;
833 }
834 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
835
836 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success)
837 goto skip_ftie;
838
839 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
840 wpa_printf(MSG_INFO, "TDLS: No FTIE in TDLS Teardown");
841 return -1;
842 }
843
844 ftie = (struct wpa_tdls_ftie *) kde.ftie;
845
846 /* Process MIC check to see if TDLS Teardown is right */
847 if (wpa_supplicant_verify_tdls_mic_teardown(4, reason_code,
848 peer->dtoken, peer,
849 (u8 *) lnkid, ftie) < 0) {
850 wpa_printf(MSG_DEBUG, "TDLS: MIC failure for TDLS "
851 "Teardown Request from " MACSTR, MAC2STR(src_addr));
852 return -1;
853 }
854
855 skip_ftie:
856 /*
857 * Request the driver to disable the direct link and clear associated
858 * keys.
859 */
860 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
861
862 /* clear the Peerkey statemachine */
863 wpa_tdls_peer_free(sm, peer);
864
865 return 0;
866 }
867
868
869 /**
870 * wpa_tdls_send_error - To send suitable TDLS status response with
871 * appropriate status code mentioning reason for error/failure.
872 * @dst - MAC addr of Peer station
873 * @tdls_action - TDLS frame type for which error code is sent
874 * @status - status code mentioning reason
875 */
876
wpa_tdls_send_error(struct wpa_sm * sm,const u8 * dst,u8 tdls_action,u8 dialog_token,u16 status)877 static int wpa_tdls_send_error(struct wpa_sm *sm, const u8 *dst,
878 u8 tdls_action, u8 dialog_token, u16 status)
879 {
880 wpa_printf(MSG_DEBUG, "TDLS: Sending error to " MACSTR
881 " (action=%u status=%u)",
882 MAC2STR(dst), tdls_action, status);
883 return wpa_tdls_tpk_send(sm, dst, tdls_action, dialog_token, status,
884 NULL, 0);
885 }
886
887
888 static struct wpa_tdls_peer *
wpa_tdls_add_peer(struct wpa_sm * sm,const u8 * addr)889 wpa_tdls_add_peer(struct wpa_sm *sm, const u8 *addr)
890 {
891 struct wpa_tdls_peer *peer;
892
893 wpa_printf(MSG_INFO, "TDLS: Creating peer entry for " MACSTR,
894 MAC2STR(addr));
895
896 peer = os_zalloc(sizeof(*peer));
897 if (peer == NULL)
898 return NULL;
899
900 os_memcpy(peer->addr, addr, ETH_ALEN);
901 peer->next = sm->tdls;
902 sm->tdls = peer;
903
904 return peer;
905 }
906
907
wpa_tdls_send_tpk_m1(struct wpa_sm * sm,struct wpa_tdls_peer * peer)908 static int wpa_tdls_send_tpk_m1(struct wpa_sm *sm,
909 struct wpa_tdls_peer *peer)
910 {
911 size_t buf_len;
912 struct wpa_tdls_timeoutie timeoutie;
913 u16 rsn_capab;
914 struct wpa_tdls_ftie *ftie;
915 u8 *rbuf, *pos, *count_pos;
916 u16 count;
917 struct rsn_ie_hdr *hdr;
918
919 if (!wpa_tdls_get_privacy(sm)) {
920 wpa_printf(MSG_DEBUG, "TDLS: No security used on the link");
921 peer->rsnie_i_len = 0;
922 goto skip_rsnie;
923 }
924
925 /*
926 * TPK Handshake Message 1:
927 * FTIE: ANonce=0, SNonce=initiator nonce MIC=0, DataKDs=(RSNIE_I,
928 * Timeout Interval IE))
929 */
930
931 /* Filling RSN IE */
932 hdr = (struct rsn_ie_hdr *) peer->rsnie_i;
933 hdr->elem_id = WLAN_EID_RSN;
934 WPA_PUT_LE16(hdr->version, RSN_VERSION);
935
936 pos = (u8 *) (hdr + 1);
937 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
938 pos += RSN_SELECTOR_LEN;
939 count_pos = pos;
940 pos += 2;
941
942 count = 0;
943
944 /*
945 * AES-CCMP is the default Encryption preferred for TDLS, so
946 * RSN IE is filled only with CCMP CIPHER
947 * Note: TKIP is not used to encrypt TDLS link.
948 *
949 * Regardless of the cipher used on the AP connection, select CCMP
950 * here.
951 */
952 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
953 pos += RSN_SELECTOR_LEN;
954 count++;
955
956 WPA_PUT_LE16(count_pos, count);
957
958 WPA_PUT_LE16(pos, 1);
959 pos += 2;
960 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
961 pos += RSN_SELECTOR_LEN;
962
963 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
964 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
965 #ifdef CONFIG_TDLS_TESTING
966 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
967 wpa_printf(MSG_DEBUG, "TDLS: Use alternative RSN IE for "
968 "testing");
969 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
970 }
971 #endif /* CONFIG_TDLS_TESTING */
972 WPA_PUT_LE16(pos, rsn_capab);
973 pos += 2;
974 #ifdef CONFIG_TDLS_TESTING
975 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
976 /* Number of PMKIDs */
977 *pos++ = 0x00;
978 *pos++ = 0x00;
979 }
980 #endif /* CONFIG_TDLS_TESTING */
981
982 hdr->len = (pos - peer->rsnie_i) - 2;
983 peer->rsnie_i_len = pos - peer->rsnie_i;
984 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
985 peer->rsnie_i, peer->rsnie_i_len);
986
987 skip_rsnie:
988 buf_len = 0;
989 if (wpa_tdls_get_privacy(sm))
990 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
991 sizeof(struct wpa_tdls_timeoutie);
992 #ifdef CONFIG_TDLS_TESTING
993 if (wpa_tdls_get_privacy(sm) &&
994 (tdls_testing & TDLS_TESTING_LONG_FRAME))
995 buf_len += 170;
996 if (tdls_testing & TDLS_TESTING_DIFF_BSSID)
997 buf_len += sizeof(struct wpa_tdls_lnkid);
998 #endif /* CONFIG_TDLS_TESTING */
999 rbuf = os_zalloc(buf_len + 1);
1000 if (rbuf == NULL) {
1001 wpa_tdls_peer_free(sm, peer);
1002 return -1;
1003 }
1004 pos = rbuf;
1005
1006 if (!wpa_tdls_get_privacy(sm))
1007 goto skip_ies;
1008
1009 /* Initiator RSN IE */
1010 pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len);
1011
1012 ftie = (struct wpa_tdls_ftie *) pos;
1013 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1014 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1015
1016 if (os_get_random(peer->inonce, WPA_NONCE_LEN)) {
1017 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1018 "TDLS: Failed to get random data for initiator Nonce");
1019 os_free(rbuf);
1020 wpa_tdls_peer_free(sm, peer);
1021 return -1;
1022 }
1023 peer->tk_set = 0; /* A new nonce results in a new TK */
1024 wpa_hexdump(MSG_DEBUG, "TDLS: Initiator Nonce for TPK handshake",
1025 peer->inonce, WPA_NONCE_LEN);
1026 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1027
1028 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK Handshake M1",
1029 (u8 *) ftie, sizeof(struct wpa_tdls_ftie));
1030
1031 pos = (u8 *) (ftie + 1);
1032
1033 #ifdef CONFIG_TDLS_TESTING
1034 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1035 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1036 "FTIE");
1037 ftie->ie_len += 170;
1038 *pos++ = 255; /* FTIE subelem */
1039 *pos++ = 168; /* FTIE subelem length */
1040 pos += 168;
1041 }
1042 #endif /* CONFIG_TDLS_TESTING */
1043
1044 /* Lifetime */
1045 peer->lifetime = TPK_LIFETIME;
1046 #ifdef CONFIG_TDLS_TESTING
1047 if (tdls_testing & TDLS_TESTING_SHORT_LIFETIME) {
1048 wpa_printf(MSG_DEBUG, "TDLS: Testing - use short TPK "
1049 "lifetime");
1050 peer->lifetime = 301;
1051 }
1052 if (tdls_testing & TDLS_TESTING_LONG_LIFETIME) {
1053 wpa_printf(MSG_DEBUG, "TDLS: Testing - use long TPK "
1054 "lifetime");
1055 peer->lifetime = 0xffffffff;
1056 }
1057 #endif /* CONFIG_TDLS_TESTING */
1058 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1059 sizeof(timeoutie), peer->lifetime);
1060 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime);
1061
1062 skip_ies:
1063
1064 #ifdef CONFIG_TDLS_TESTING
1065 if (tdls_testing & TDLS_TESTING_DIFF_BSSID) {
1066 wpa_printf(MSG_DEBUG, "TDLS: Testing - use incorrect BSSID in "
1067 "Link Identifier");
1068 struct wpa_tdls_lnkid *l = (struct wpa_tdls_lnkid *) pos;
1069 wpa_tdls_linkid(sm, peer, l);
1070 l->bssid[5] ^= 0x01;
1071 pos += sizeof(*l);
1072 }
1073 #endif /* CONFIG_TDLS_TESTING */
1074
1075 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Request / TPK "
1076 "Handshake Message 1 (peer " MACSTR ")",
1077 MAC2STR(peer->addr));
1078
1079 wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_SETUP_REQUEST, 1, 0,
1080 rbuf, pos - rbuf);
1081 os_free(rbuf);
1082
1083 return 0;
1084 }
1085
1086
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)1087 static int wpa_tdls_send_tpk_m2(struct wpa_sm *sm,
1088 const unsigned char *src_addr, u8 dtoken,
1089 struct wpa_tdls_lnkid *lnkid,
1090 const struct wpa_tdls_peer *peer)
1091 {
1092 u8 *rbuf, *pos;
1093 size_t buf_len;
1094 u32 lifetime;
1095 struct wpa_tdls_timeoutie timeoutie;
1096 struct wpa_tdls_ftie *ftie;
1097
1098 buf_len = 0;
1099 if (wpa_tdls_get_privacy(sm)) {
1100 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1101 * Lifetime */
1102 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1103 sizeof(struct wpa_tdls_timeoutie);
1104 #ifdef CONFIG_TDLS_TESTING
1105 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1106 buf_len += 170;
1107 #endif /* CONFIG_TDLS_TESTING */
1108 }
1109
1110 rbuf = os_zalloc(buf_len + 1);
1111 if (rbuf == NULL)
1112 return -1;
1113 pos = rbuf;
1114
1115 if (!wpa_tdls_get_privacy(sm))
1116 goto skip_ies;
1117
1118 /* Peer RSN IE */
1119 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1120
1121 ftie = (struct wpa_tdls_ftie *) pos;
1122 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1123 /* TODO: ftie->mic_control to set 2-RESPONSE */
1124 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1125 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1126 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1127 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK M2",
1128 (u8 *) ftie, sizeof(*ftie));
1129
1130 pos = (u8 *) (ftie + 1);
1131
1132 #ifdef CONFIG_TDLS_TESTING
1133 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1134 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1135 "FTIE");
1136 ftie->ie_len += 170;
1137 *pos++ = 255; /* FTIE subelem */
1138 *pos++ = 168; /* FTIE subelem length */
1139 pos += 168;
1140 }
1141 #endif /* CONFIG_TDLS_TESTING */
1142
1143 /* Lifetime */
1144 lifetime = peer->lifetime;
1145 #ifdef CONFIG_TDLS_TESTING
1146 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_RESP) {
1147 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1148 "lifetime in response");
1149 lifetime++;
1150 }
1151 #endif /* CONFIG_TDLS_TESTING */
1152 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1153 sizeof(timeoutie), lifetime);
1154 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds from initiator",
1155 lifetime);
1156
1157 /* compute MIC before sending */
1158 wpa_tdls_ftie_mic(peer->tpk.kck, 2, (u8 *) lnkid, peer->rsnie_p,
1159 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1160
1161 skip_ies:
1162 wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0,
1163 rbuf, pos - rbuf);
1164 os_free(rbuf);
1165
1166 return 0;
1167 }
1168
1169
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)1170 static int wpa_tdls_send_tpk_m3(struct wpa_sm *sm,
1171 const unsigned char *src_addr, u8 dtoken,
1172 struct wpa_tdls_lnkid *lnkid,
1173 const struct wpa_tdls_peer *peer)
1174 {
1175 u8 *rbuf, *pos;
1176 size_t buf_len;
1177 struct wpa_tdls_ftie *ftie;
1178 struct wpa_tdls_timeoutie timeoutie;
1179 u32 lifetime;
1180
1181 buf_len = 0;
1182 if (wpa_tdls_get_privacy(sm)) {
1183 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1184 * Lifetime */
1185 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1186 sizeof(struct wpa_tdls_timeoutie);
1187 #ifdef CONFIG_TDLS_TESTING
1188 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1189 buf_len += 170;
1190 #endif /* CONFIG_TDLS_TESTING */
1191 }
1192
1193 rbuf = os_zalloc(buf_len + 1);
1194 if (rbuf == NULL)
1195 return -1;
1196 pos = rbuf;
1197
1198 if (!wpa_tdls_get_privacy(sm))
1199 goto skip_ies;
1200
1201 /* Peer RSN IE */
1202 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1203
1204 ftie = (struct wpa_tdls_ftie *) pos;
1205 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1206 /*TODO: ftie->mic_control to set 3-CONFIRM */
1207 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1208 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1209 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1210
1211 pos = (u8 *) (ftie + 1);
1212
1213 #ifdef CONFIG_TDLS_TESTING
1214 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1215 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1216 "FTIE");
1217 ftie->ie_len += 170;
1218 *pos++ = 255; /* FTIE subelem */
1219 *pos++ = 168; /* FTIE subelem length */
1220 pos += 168;
1221 }
1222 #endif /* CONFIG_TDLS_TESTING */
1223
1224 /* Lifetime */
1225 lifetime = peer->lifetime;
1226 #ifdef CONFIG_TDLS_TESTING
1227 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_CONF) {
1228 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1229 "lifetime in confirm");
1230 lifetime++;
1231 }
1232 #endif /* CONFIG_TDLS_TESTING */
1233 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1234 sizeof(timeoutie), lifetime);
1235 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds",
1236 lifetime);
1237
1238 /* compute MIC before sending */
1239 wpa_tdls_ftie_mic(peer->tpk.kck, 3, (u8 *) lnkid, peer->rsnie_p,
1240 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1241
1242 skip_ies:
1243 wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 0,
1244 rbuf, pos - rbuf);
1245 os_free(rbuf);
1246
1247 return 0;
1248 }
1249
1250
wpa_tdls_send_discovery_response(struct wpa_sm * sm,struct wpa_tdls_peer * peer,u8 dialog_token)1251 static int wpa_tdls_send_discovery_response(struct wpa_sm *sm,
1252 struct wpa_tdls_peer *peer,
1253 u8 dialog_token)
1254 {
1255 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Discovery Response "
1256 "(peer " MACSTR ")", MAC2STR(peer->addr));
1257
1258 return wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_DISCOVERY_RESPONSE,
1259 dialog_token, 0, NULL, 0);
1260 }
1261
1262
1263 static int
wpa_tdls_process_discovery_request(struct wpa_sm * sm,const u8 * addr,const u8 * buf,size_t len)1264 wpa_tdls_process_discovery_request(struct wpa_sm *sm, const u8 *addr,
1265 const u8 *buf, size_t len)
1266 {
1267 struct wpa_eapol_ie_parse kde;
1268 const struct wpa_tdls_lnkid *lnkid;
1269 struct wpa_tdls_peer *peer;
1270 size_t min_req_len = sizeof(struct wpa_tdls_frame) +
1271 1 /* dialog token */ + sizeof(struct wpa_tdls_lnkid);
1272 u8 dialog_token;
1273
1274 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from " MACSTR,
1275 MAC2STR(addr));
1276
1277 if (len < min_req_len) {
1278 wpa_printf(MSG_DEBUG, "TDLS Discovery Request is too short: "
1279 "%d", (int) len);
1280 return -1;
1281 }
1282
1283 dialog_token = buf[sizeof(struct wpa_tdls_frame)];
1284
1285 if (wpa_supplicant_parse_ies(buf + sizeof(struct wpa_tdls_frame) + 1,
1286 len - (sizeof(struct wpa_tdls_frame) + 1),
1287 &kde) < 0)
1288 return -1;
1289
1290 if (!kde.lnkid) {
1291 wpa_printf(MSG_DEBUG, "TDLS: Link ID not found in Discovery "
1292 "Request");
1293 return -1;
1294 }
1295
1296 lnkid = (const struct wpa_tdls_lnkid *) kde.lnkid;
1297
1298 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1299 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from different "
1300 " BSS " MACSTR, MAC2STR(lnkid->bssid));
1301 return -1;
1302 }
1303
1304 peer = wpa_tdls_add_peer(sm, addr);
1305 if (peer == NULL)
1306 return -1;
1307
1308 return wpa_tdls_send_discovery_response(sm, peer, dialog_token);
1309 }
1310
1311
wpa_tdls_send_discovery_request(struct wpa_sm * sm,const u8 * addr)1312 int wpa_tdls_send_discovery_request(struct wpa_sm *sm, const u8 *addr)
1313 {
1314 if (sm->tdls_disabled || !sm->tdls_supported)
1315 return -1;
1316
1317 wpa_printf(MSG_DEBUG, "TDLS: Sending Discovery Request to peer "
1318 MACSTR, MAC2STR(addr));
1319 return wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_DISCOVERY_REQUEST,
1320 1, 0, NULL, 0);
1321 }
1322
1323
copy_supp_rates(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1324 static int copy_supp_rates(const struct wpa_eapol_ie_parse *kde,
1325 struct wpa_tdls_peer *peer)
1326 {
1327 if (!kde->supp_rates) {
1328 wpa_printf(MSG_DEBUG, "TDLS: No supported rates received");
1329 return -1;
1330 }
1331
1332 peer->supp_rates_len = kde->supp_rates_len - 2;
1333 if (peer->supp_rates_len > IEEE80211_MAX_SUPP_RATES)
1334 peer->supp_rates_len = IEEE80211_MAX_SUPP_RATES;
1335 os_memcpy(peer->supp_rates, kde->supp_rates + 2, peer->supp_rates_len);
1336
1337 if (kde->ext_supp_rates) {
1338 int clen = kde->ext_supp_rates_len - 2;
1339 if (peer->supp_rates_len + clen > IEEE80211_MAX_SUPP_RATES)
1340 clen = IEEE80211_MAX_SUPP_RATES - peer->supp_rates_len;
1341 os_memcpy(peer->supp_rates + peer->supp_rates_len,
1342 kde->ext_supp_rates + 2, clen);
1343 peer->supp_rates_len += clen;
1344 }
1345
1346 return 0;
1347 }
1348
1349
wpa_tdls_process_tpk_m1(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)1350 static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr,
1351 const u8 *buf, size_t len)
1352 {
1353 struct wpa_tdls_peer *peer;
1354 struct wpa_eapol_ie_parse kde;
1355 struct wpa_ie_data ie;
1356 int cipher;
1357 const u8 *cpos;
1358 struct wpa_tdls_ftie *ftie = NULL;
1359 struct wpa_tdls_timeoutie *timeoutie;
1360 struct wpa_tdls_lnkid *lnkid;
1361 u32 lifetime = 0;
1362 #if 0
1363 struct rsn_ie_hdr *hdr;
1364 u8 *pos;
1365 u16 rsn_capab;
1366 u16 rsn_ver;
1367 #endif
1368 u8 dtoken;
1369 u16 ielen;
1370 u16 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
1371 int tdls_prohibited = sm->tdls_prohibited;
1372 int existing_peer = 0;
1373
1374 if (len < 3 + 3)
1375 return -1;
1376
1377 cpos = buf;
1378 cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1379
1380 /* driver had already verified the frame format */
1381 dtoken = *cpos++; /* dialog token */
1382
1383 wpa_printf(MSG_INFO, "TDLS: Dialog Token in TPK M1 %d", dtoken);
1384
1385 for (peer = sm->tdls; peer; peer = peer->next) {
1386 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) {
1387 existing_peer = 1;
1388 break;
1389 }
1390 }
1391
1392 if (peer == NULL) {
1393 peer = wpa_tdls_add_peer(sm, src_addr);
1394 if (peer == NULL)
1395 goto error;
1396 }
1397
1398 /* capability information */
1399 peer->capability = WPA_GET_LE16(cpos);
1400 cpos += 2;
1401
1402 ielen = len - (cpos - buf); /* start of IE in buf */
1403 if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0) {
1404 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M1");
1405 goto error;
1406 }
1407
1408 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1409 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
1410 "TPK M1");
1411 goto error;
1412 }
1413 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M1",
1414 kde.lnkid, kde.lnkid_len);
1415 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1416 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1417 wpa_printf(MSG_INFO, "TDLS: TPK M1 from diff BSS");
1418 status = WLAN_STATUS_NOT_IN_SAME_BSS;
1419 goto error;
1420 }
1421
1422 wpa_printf(MSG_DEBUG, "TDLS: TPK M1 - TPK initiator " MACSTR,
1423 MAC2STR(src_addr));
1424
1425 if (copy_supp_rates(&kde, peer) < 0)
1426 goto error;
1427
1428 #ifdef CONFIG_TDLS_TESTING
1429 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
1430 for (peer = sm->tdls; peer; peer = peer->next) {
1431 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
1432 break;
1433 }
1434 if (peer == NULL) {
1435 peer = wpa_tdls_add_peer(sm, src_addr);
1436 if (peer == NULL)
1437 goto error;
1438 }
1439 wpa_printf(MSG_DEBUG, "TDLS: Testing concurrent initiation of "
1440 "TDLS setup - send own request");
1441 peer->initiator = 1;
1442 wpa_tdls_send_tpk_m1(sm, peer);
1443 }
1444
1445 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
1446 tdls_prohibited) {
1447 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
1448 "on TDLS");
1449 tdls_prohibited = 0;
1450 }
1451 #endif /* CONFIG_TDLS_TESTING */
1452
1453 if (tdls_prohibited) {
1454 wpa_printf(MSG_INFO, "TDLS: TDLS prohibited in this BSS");
1455 status = WLAN_STATUS_REQUEST_DECLINED;
1456 goto error;
1457 }
1458
1459 if (!wpa_tdls_get_privacy(sm)) {
1460 if (kde.rsn_ie) {
1461 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M1 while "
1462 "security is disabled");
1463 status = WLAN_STATUS_SECURITY_DISABLED;
1464 goto error;
1465 }
1466 goto skip_rsn;
1467 }
1468
1469 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
1470 kde.rsn_ie == NULL) {
1471 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M1");
1472 status = WLAN_STATUS_INVALID_PARAMETERS;
1473 goto error;
1474 }
1475
1476 if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
1477 wpa_printf(MSG_INFO, "TDLS: Too long Initiator RSN IE in "
1478 "TPK M1");
1479 status = WLAN_STATUS_INVALID_RSNIE;
1480 goto error;
1481 }
1482
1483 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
1484 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M1");
1485 status = WLAN_STATUS_INVALID_RSNIE;
1486 goto error;
1487 }
1488
1489 cipher = ie.pairwise_cipher;
1490 if (cipher & WPA_CIPHER_CCMP) {
1491 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
1492 cipher = WPA_CIPHER_CCMP;
1493 } else {
1494 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M1");
1495 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
1496 goto error;
1497 }
1498
1499 if ((ie.capabilities &
1500 (WPA_CAPABILITY_NO_PAIRWISE | WPA_CAPABILITY_PEERKEY_ENABLED)) !=
1501 WPA_CAPABILITY_PEERKEY_ENABLED) {
1502 wpa_printf(MSG_INFO, "TDLS: Invalid RSN Capabilities in "
1503 "TPK M1");
1504 status = WLAN_STATUS_INVALID_RSN_IE_CAPAB;
1505 goto error;
1506 }
1507
1508 /* Lifetime */
1509 if (kde.key_lifetime == NULL) {
1510 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1");
1511 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1512 goto error;
1513 }
1514 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
1515 lifetime = WPA_GET_LE32(timeoutie->value);
1516 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime);
1517 if (lifetime < 300) {
1518 wpa_printf(MSG_INFO, "TDLS: Too short TPK lifetime");
1519 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1520 goto error;
1521 }
1522
1523 skip_rsn:
1524 /* If found, use existing entry instead of adding a new one;
1525 * how to handle the case where both ends initiate at the
1526 * same time? */
1527 if (existing_peer) {
1528 if (peer->tpk_success) {
1529 wpa_printf(MSG_DEBUG, "TDLS: TDLS Setup Request while "
1530 "direct link is enabled - tear down the "
1531 "old link first");
1532 #if 0
1533 /* TODO: Disabling the link would be more proper
1534 * operation here, but it seems to trigger a race with
1535 * some drivers handling the new request frame. */
1536 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1537 #else
1538 if (sm->tdls_external_setup)
1539 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK,
1540 src_addr);
1541 else
1542 wpa_tdls_del_key(sm, peer);
1543 #endif
1544 wpa_tdls_peer_free(sm, peer);
1545 }
1546
1547 /*
1548 * An entry is already present, so check if we already sent a
1549 * TDLS Setup Request. If so, compare MAC addresses and let the
1550 * STA with the lower MAC address continue as the initiator.
1551 * The other negotiation is terminated.
1552 */
1553 if (peer->initiator) {
1554 if (os_memcmp(sm->own_addr, src_addr, ETH_ALEN) < 0) {
1555 wpa_printf(MSG_DEBUG, "TDLS: Discard request "
1556 "from peer with higher address "
1557 MACSTR, MAC2STR(src_addr));
1558 return -1;
1559 } else {
1560 wpa_printf(MSG_DEBUG, "TDLS: Accept request "
1561 "from peer with lower address "
1562 MACSTR " (terminate previously "
1563 "initiated negotiation",
1564 MAC2STR(src_addr));
1565 wpa_tdls_peer_free(sm, peer);
1566 }
1567 }
1568 }
1569
1570 #ifdef CONFIG_TDLS_TESTING
1571 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
1572 if (os_memcmp(sm->own_addr, peer->addr, ETH_ALEN) < 0) {
1573 /*
1574 * The request frame from us is going to win, so do not
1575 * replace information based on this request frame from
1576 * the peer.
1577 */
1578 goto skip_rsn_check;
1579 }
1580 }
1581 #endif /* CONFIG_TDLS_TESTING */
1582
1583 peer->initiator = 0; /* Need to check */
1584 peer->dtoken = dtoken;
1585
1586 if (!wpa_tdls_get_privacy(sm)) {
1587 peer->rsnie_i_len = 0;
1588 peer->rsnie_p_len = 0;
1589 peer->cipher = WPA_CIPHER_NONE;
1590 goto skip_rsn_check;
1591 }
1592
1593 ftie = (struct wpa_tdls_ftie *) kde.ftie;
1594 os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN);
1595 os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
1596 peer->rsnie_i_len = kde.rsn_ie_len;
1597 peer->cipher = cipher;
1598
1599 if (os_get_random(peer->rnonce, WPA_NONCE_LEN)) {
1600 wpa_msg(sm->ctx->ctx, MSG_WARNING,
1601 "TDLS: Failed to get random data for responder nonce");
1602 wpa_tdls_peer_free(sm, peer);
1603 goto error;
1604 }
1605 peer->tk_set = 0; /* A new nonce results in a new TK */
1606
1607 #if 0
1608 /* get version info from RSNIE received from Peer */
1609 hdr = (struct rsn_ie_hdr *) kde.rsn_ie;
1610 rsn_ver = WPA_GET_LE16(hdr->version);
1611
1612 /* use min(peer's version, out version) */
1613 if (rsn_ver > RSN_VERSION)
1614 rsn_ver = RSN_VERSION;
1615
1616 hdr = (struct rsn_ie_hdr *) peer->rsnie_p;
1617
1618 hdr->elem_id = WLAN_EID_RSN;
1619 WPA_PUT_LE16(hdr->version, rsn_ver);
1620 pos = (u8 *) (hdr + 1);
1621
1622 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
1623 pos += RSN_SELECTOR_LEN;
1624 /* Include only the selected cipher in pairwise cipher suite */
1625 WPA_PUT_LE16(pos, 1);
1626 pos += 2;
1627 if (cipher == WPA_CIPHER_CCMP)
1628 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1629 pos += RSN_SELECTOR_LEN;
1630
1631 WPA_PUT_LE16(pos, 1);
1632 pos += 2;
1633 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
1634 pos += RSN_SELECTOR_LEN;
1635
1636 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1637 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
1638 WPA_PUT_LE16(pos, rsn_capab);
1639 pos += 2;
1640
1641 hdr->len = (pos - peer->rsnie_p) - 2;
1642 peer->rsnie_p_len = pos - peer->rsnie_p;
1643 #endif
1644
1645 /* temp fix: validation of RSNIE later */
1646 os_memcpy(peer->rsnie_p, peer->rsnie_i, peer->rsnie_i_len);
1647 peer->rsnie_p_len = peer->rsnie_i_len;
1648
1649 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
1650 peer->rsnie_p, peer->rsnie_p_len);
1651
1652 peer->lifetime = lifetime;
1653
1654 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
1655
1656 skip_rsn_check:
1657 /* add the peer to the driver as a "setup in progress" peer */
1658 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, NULL, 0);
1659
1660 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Response / TPK M2");
1661 if (wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer) < 0) {
1662 wpa_tdls_disable_link(sm, peer->addr);
1663 goto error;
1664 }
1665
1666 return 0;
1667
1668 error:
1669 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken,
1670 status);
1671 return -1;
1672 }
1673
1674
wpa_tdls_enable_link(struct wpa_sm * sm,struct wpa_tdls_peer * peer)1675 static void wpa_tdls_enable_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
1676 {
1677 peer->tpk_success = 1;
1678 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
1679 if (wpa_tdls_get_privacy(sm)) {
1680 u32 lifetime = peer->lifetime;
1681 /*
1682 * Start the initiator process a bit earlier to avoid race
1683 * condition with the responder sending teardown request.
1684 */
1685 if (lifetime > 3 && peer->initiator)
1686 lifetime -= 3;
1687 eloop_register_timeout(lifetime, 0, wpa_tdls_tpk_timeout,
1688 sm, peer);
1689 #ifdef CONFIG_TDLS_TESTING
1690 if (tdls_testing & TDLS_TESTING_NO_TPK_EXPIRATION) {
1691 wpa_printf(MSG_DEBUG, "TDLS: Testing - disable TPK "
1692 "expiration");
1693 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
1694 }
1695 #endif /* CONFIG_TDLS_TESTING */
1696 }
1697
1698 /* add supported rates and capabilities to the TDLS peer */
1699 wpa_sm_tdls_peer_addset(sm, peer->addr, 0, peer->capability,
1700 peer->supp_rates, peer->supp_rates_len);
1701
1702 wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, peer->addr);
1703 }
1704
1705
wpa_tdls_process_tpk_m2(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)1706 static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
1707 const u8 *buf, size_t len)
1708 {
1709 struct wpa_tdls_peer *peer;
1710 struct wpa_eapol_ie_parse kde;
1711 struct wpa_ie_data ie;
1712 int cipher;
1713 struct wpa_tdls_ftie *ftie;
1714 struct wpa_tdls_timeoutie *timeoutie;
1715 struct wpa_tdls_lnkid *lnkid;
1716 u32 lifetime;
1717 u8 dtoken;
1718 int ielen;
1719 u16 status;
1720 const u8 *pos;
1721
1722 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Response / TPK M2 "
1723 "(Peer " MACSTR ")", MAC2STR(src_addr));
1724 for (peer = sm->tdls; peer; peer = peer->next) {
1725 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
1726 break;
1727 }
1728 if (peer == NULL) {
1729 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
1730 "TPK M2: " MACSTR, MAC2STR(src_addr));
1731 return -1;
1732 }
1733
1734 if (peer->tpk_success) {
1735 wpa_printf(MSG_INFO, "TDLS: Ignore incoming TPK M2 retry, from "
1736 MACSTR " as TPK M3 was already sent",
1737 MAC2STR(src_addr));
1738 return 0;
1739 }
1740
1741 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_REQUEST);
1742
1743 if (len < 3 + 2 + 1)
1744 return -1;
1745 pos = buf;
1746 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1747 status = WPA_GET_LE16(pos);
1748 pos += 2 /* status code */;
1749
1750 if (status != WLAN_STATUS_SUCCESS) {
1751 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M2: %u",
1752 status);
1753 if (sm->tdls_external_setup)
1754 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1755 return -1;
1756 }
1757
1758 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
1759
1760 /* TODO: need to verify dialog token matches here or in kernel */
1761 dtoken = *pos++; /* dialog token */
1762
1763 wpa_printf(MSG_DEBUG, "TDLS: Dialog Token in TPK M2 %d", dtoken);
1764
1765 if (len < 3 + 2 + 1 + 2)
1766 return -1;
1767
1768 /* capability information */
1769 peer->capability = WPA_GET_LE16(pos);
1770 pos += 2;
1771
1772 ielen = len - (pos - buf); /* start of IE in buf */
1773 if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0) {
1774 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M2");
1775 goto error;
1776 }
1777
1778 #ifdef CONFIG_TDLS_TESTING
1779 if (tdls_testing & TDLS_TESTING_DECLINE_RESP) {
1780 wpa_printf(MSG_DEBUG, "TDLS: Testing - decline response");
1781 status = WLAN_STATUS_REQUEST_DECLINED;
1782 goto error;
1783 }
1784 #endif /* CONFIG_TDLS_TESTING */
1785
1786 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1787 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
1788 "TPK M2");
1789 goto error;
1790 }
1791 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M2",
1792 kde.lnkid, kde.lnkid_len);
1793 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1794
1795 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1796 wpa_printf(MSG_INFO, "TDLS: TPK M2 from different BSS");
1797 status = WLAN_STATUS_NOT_IN_SAME_BSS;
1798 goto error;
1799 }
1800
1801 if (copy_supp_rates(&kde, peer) < 0)
1802 goto error;
1803
1804 if (!wpa_tdls_get_privacy(sm)) {
1805 peer->rsnie_p_len = 0;
1806 peer->cipher = WPA_CIPHER_NONE;
1807 goto skip_rsn;
1808 }
1809
1810 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
1811 kde.rsn_ie == NULL) {
1812 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M2");
1813 status = WLAN_STATUS_INVALID_PARAMETERS;
1814 goto error;
1815 }
1816 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
1817 kde.rsn_ie, kde.rsn_ie_len);
1818
1819 /*
1820 * FIX: bitwise comparison of RSN IE is not the correct way of
1821 * validation this. It can be different, but certain fields must
1822 * match. Since we list only a single pairwise cipher in TPK M1, the
1823 * memcmp is likely to work in most cases, though.
1824 */
1825 if (kde.rsn_ie_len != peer->rsnie_i_len ||
1826 os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) != 0) {
1827 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M2 does "
1828 "not match with RSN IE used in TPK M1");
1829 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Sent in TPK M1",
1830 peer->rsnie_i, peer->rsnie_i_len);
1831 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
1832 kde.rsn_ie, kde.rsn_ie_len);
1833 status = WLAN_STATUS_INVALID_RSNIE;
1834 goto error;
1835 }
1836
1837 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
1838 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M2");
1839 status = WLAN_STATUS_INVALID_RSNIE;
1840 goto error;
1841 }
1842
1843 cipher = ie.pairwise_cipher;
1844 if (cipher == WPA_CIPHER_CCMP) {
1845 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
1846 cipher = WPA_CIPHER_CCMP;
1847 } else {
1848 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M2");
1849 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
1850 goto error;
1851 }
1852
1853 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M2",
1854 kde.ftie, sizeof(*ftie));
1855 ftie = (struct wpa_tdls_ftie *) kde.ftie;
1856
1857 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
1858 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does "
1859 "not match with FTIE SNonce used in TPK M1");
1860 /* Silently discard the frame */
1861 return -1;
1862 }
1863
1864 /* Responder Nonce and RSN IE */
1865 os_memcpy(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN);
1866 os_memcpy(peer->rsnie_p, kde.rsn_ie, kde.rsn_ie_len);
1867 peer->rsnie_p_len = kde.rsn_ie_len;
1868 peer->cipher = cipher;
1869
1870 /* Lifetime */
1871 if (kde.key_lifetime == NULL) {
1872 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M2");
1873 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1874 goto error;
1875 }
1876 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
1877 lifetime = WPA_GET_LE32(timeoutie->value);
1878 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M2",
1879 lifetime);
1880 if (lifetime != peer->lifetime) {
1881 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
1882 "TPK M2 (expected %u)", lifetime, peer->lifetime);
1883 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1884 goto error;
1885 }
1886
1887 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
1888
1889 /* Process MIC check to see if TPK M2 is right */
1890 if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid,
1891 (u8 *) timeoutie, ftie) < 0) {
1892 /* Discard the frame */
1893 wpa_tdls_del_key(sm, peer);
1894 wpa_tdls_peer_free(sm, peer);
1895 if (sm->tdls_external_setup)
1896 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1897 return -1;
1898 }
1899
1900 wpa_tdls_set_key(sm, peer);
1901
1902 skip_rsn:
1903 peer->dtoken = dtoken;
1904
1905 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Confirm / "
1906 "TPK Handshake Message 3");
1907 wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer);
1908
1909 wpa_tdls_enable_link(sm, peer);
1910
1911 return 0;
1912
1913 error:
1914 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken,
1915 status);
1916 if (sm->tdls_external_setup)
1917 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1918 return -1;
1919 }
1920
1921
wpa_tdls_process_tpk_m3(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)1922 static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr,
1923 const u8 *buf, size_t len)
1924 {
1925 struct wpa_tdls_peer *peer;
1926 struct wpa_eapol_ie_parse kde;
1927 struct wpa_tdls_ftie *ftie;
1928 struct wpa_tdls_timeoutie *timeoutie;
1929 struct wpa_tdls_lnkid *lnkid;
1930 int ielen;
1931 u16 status;
1932 const u8 *pos;
1933 u32 lifetime;
1934
1935 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Confirm / TPK M3 "
1936 "(Peer " MACSTR ")", MAC2STR(src_addr));
1937 for (peer = sm->tdls; peer; peer = peer->next) {
1938 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
1939 break;
1940 }
1941 if (peer == NULL) {
1942 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
1943 "TPK M3: " MACSTR, MAC2STR(src_addr));
1944 return -1;
1945 }
1946 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_RESPONSE);
1947
1948 if (len < 3 + 3)
1949 return -1;
1950 pos = buf;
1951 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1952
1953 status = WPA_GET_LE16(pos);
1954
1955 if (status != 0) {
1956 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M3: %u",
1957 status);
1958 if (sm->tdls_external_setup)
1959 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1960 return -1;
1961 }
1962 pos += 2 /* status code */ + 1 /* dialog token */;
1963
1964 ielen = len - (pos - buf); /* start of IE in buf */
1965 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) {
1966 wpa_printf(MSG_INFO, "TDLS: Failed to parse KDEs in TPK M3");
1967 return -1;
1968 }
1969
1970 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1971 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M3");
1972 return -1;
1973 }
1974 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M3",
1975 (u8 *) kde.lnkid, kde.lnkid_len);
1976 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1977
1978 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1979 wpa_printf(MSG_INFO, "TDLS: TPK M3 from diff BSS");
1980 return -1;
1981 }
1982
1983 if (!wpa_tdls_get_privacy(sm))
1984 goto skip_rsn;
1985
1986 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
1987 wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M3");
1988 return -1;
1989 }
1990 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M3",
1991 kde.ftie, sizeof(*ftie));
1992 ftie = (struct wpa_tdls_ftie *) kde.ftie;
1993
1994 if (kde.rsn_ie == NULL) {
1995 wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M3");
1996 return -1;
1997 }
1998 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M3",
1999 kde.rsn_ie, kde.rsn_ie_len);
2000 if (kde.rsn_ie_len != peer->rsnie_p_len ||
2001 os_memcmp(kde.rsn_ie, peer->rsnie_p, peer->rsnie_p_len) != 0) {
2002 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M3 does not match "
2003 "with the one sent in TPK M2");
2004 return -1;
2005 }
2006
2007 if (!os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) {
2008 wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does "
2009 "not match with FTIE ANonce used in TPK M2");
2010 return -1;
2011 }
2012
2013 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
2014 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M3 does not "
2015 "match with FTIE SNonce used in TPK M1");
2016 return -1;
2017 }
2018
2019 if (kde.key_lifetime == NULL) {
2020 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M3");
2021 return -1;
2022 }
2023 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
2024 wpa_hexdump(MSG_DEBUG, "TDLS: Timeout IE Received from TPK M3",
2025 (u8 *) timeoutie, sizeof(*timeoutie));
2026 lifetime = WPA_GET_LE32(timeoutie->value);
2027 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M3",
2028 lifetime);
2029 if (lifetime != peer->lifetime) {
2030 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
2031 "TPK M3 (expected %u)", lifetime, peer->lifetime);
2032 if (sm->tdls_external_setup)
2033 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
2034 return -1;
2035 }
2036
2037 if (wpa_supplicant_verify_tdls_mic(3, peer, (u8 *) lnkid,
2038 (u8 *) timeoutie, ftie) < 0) {
2039 wpa_tdls_del_key(sm, peer);
2040 wpa_tdls_peer_free(sm, peer);
2041 return -1;
2042 }
2043
2044 if (wpa_tdls_set_key(sm, peer) < 0)
2045 return -1;
2046
2047 skip_rsn:
2048 wpa_tdls_enable_link(sm, peer);
2049
2050 return 0;
2051 }
2052
2053
wpa_add_tdls_timeoutie(u8 * pos,u8 * ie,size_t ie_len,u32 tsecs)2054 static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs)
2055 {
2056 struct wpa_tdls_timeoutie *lifetime = (struct wpa_tdls_timeoutie *) ie;
2057
2058 os_memset(lifetime, 0, ie_len);
2059 lifetime->ie_type = WLAN_EID_TIMEOUT_INTERVAL;
2060 lifetime->ie_len = sizeof(struct wpa_tdls_timeoutie) - 2;
2061 lifetime->interval_type = WLAN_TIMEOUT_KEY_LIFETIME;
2062 WPA_PUT_LE32(lifetime->value, tsecs);
2063 os_memcpy(pos, ie, ie_len);
2064 return pos + ie_len;
2065 }
2066
2067
2068 /**
2069 * wpa_tdls_start - Initiate TDLS handshake (send TPK Handshake Message 1)
2070 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2071 * @peer: MAC address of the peer STA
2072 * Returns: 0 on success, or -1 on failure
2073 *
2074 * Send TPK Handshake Message 1 info to driver to start TDLS
2075 * handshake with the peer.
2076 */
wpa_tdls_start(struct wpa_sm * sm,const u8 * addr)2077 int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr)
2078 {
2079 struct wpa_tdls_peer *peer;
2080 int tdls_prohibited = sm->tdls_prohibited;
2081
2082 if (sm->tdls_disabled || !sm->tdls_supported)
2083 return -1;
2084
2085 #ifdef CONFIG_TDLS_TESTING
2086 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
2087 tdls_prohibited) {
2088 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
2089 "on TDLS");
2090 tdls_prohibited = 0;
2091 }
2092 #endif /* CONFIG_TDLS_TESTING */
2093
2094 if (tdls_prohibited) {
2095 wpa_printf(MSG_DEBUG, "TDLS: TDLS is prohibited in this BSS - "
2096 "reject request to start setup");
2097 return -1;
2098 }
2099
2100 /* Find existing entry and if found, use that instead of adding
2101 * a new one */
2102 for (peer = sm->tdls; peer; peer = peer->next) {
2103 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
2104 break;
2105 }
2106
2107 if (peer == NULL) {
2108 peer = wpa_tdls_add_peer(sm, addr);
2109 if (peer == NULL)
2110 return -1;
2111 }
2112
2113 peer->initiator = 1;
2114
2115 /* add the peer to the driver as a "setup in progress" peer */
2116 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, NULL, 0);
2117
2118 if (wpa_tdls_send_tpk_m1(sm, peer) < 0) {
2119 wpa_tdls_disable_link(sm, peer->addr);
2120 return -1;
2121 }
2122
2123 return 0;
2124 }
2125
2126
wpa_tdls_reneg(struct wpa_sm * sm,const u8 * addr)2127 int wpa_tdls_reneg(struct wpa_sm *sm, const u8 *addr)
2128 {
2129 struct wpa_tdls_peer *peer;
2130
2131 if (sm->tdls_disabled || !sm->tdls_supported)
2132 return -1;
2133
2134 for (peer = sm->tdls; peer; peer = peer->next) {
2135 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
2136 break;
2137 }
2138
2139 if (peer == NULL || !peer->tpk_success)
2140 return -1;
2141
2142 if (sm->tdls_external_setup) {
2143 /*
2144 * Disable previous link to allow renegotiation to be completed
2145 * on AP path.
2146 */
2147 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2148 }
2149
2150 return wpa_tdls_start(sm, addr);
2151 }
2152
2153
2154 /**
2155 * wpa_supplicant_rx_tdls - Receive TDLS data frame
2156 *
2157 * This function is called to receive TDLS (ethertype = 0x890d) data frames.
2158 */
wpa_supplicant_rx_tdls(void * ctx,const u8 * src_addr,const u8 * buf,size_t len)2159 static void wpa_supplicant_rx_tdls(void *ctx, const u8 *src_addr,
2160 const u8 *buf, size_t len)
2161 {
2162 struct wpa_sm *sm = ctx;
2163 struct wpa_tdls_frame *tf;
2164
2165 wpa_hexdump(MSG_DEBUG, "TDLS: Received Data frame encapsulation",
2166 buf, len);
2167
2168 if (sm->tdls_disabled || !sm->tdls_supported) {
2169 wpa_printf(MSG_DEBUG, "TDLS: Discard message - TDLS disabled "
2170 "or unsupported by driver");
2171 return;
2172 }
2173
2174 if (os_memcmp(src_addr, sm->own_addr, ETH_ALEN) == 0) {
2175 wpa_printf(MSG_DEBUG, "TDLS: Discard copy of own message");
2176 return;
2177 }
2178
2179 if (len < sizeof(*tf)) {
2180 wpa_printf(MSG_INFO, "TDLS: Drop too short frame");
2181 return;
2182 }
2183
2184 /* Check to make sure its a valid encapsulated TDLS frame */
2185 tf = (struct wpa_tdls_frame *) buf;
2186 if (tf->payloadtype != 2 /* TDLS_RFTYPE */ ||
2187 tf->category != WLAN_ACTION_TDLS) {
2188 wpa_printf(MSG_INFO, "TDLS: Invalid frame - payloadtype=%u "
2189 "category=%u action=%u",
2190 tf->payloadtype, tf->category, tf->action);
2191 return;
2192 }
2193
2194 switch (tf->action) {
2195 case WLAN_TDLS_SETUP_REQUEST:
2196 wpa_tdls_process_tpk_m1(sm, src_addr, buf, len);
2197 break;
2198 case WLAN_TDLS_SETUP_RESPONSE:
2199 wpa_tdls_process_tpk_m2(sm, src_addr, buf, len);
2200 break;
2201 case WLAN_TDLS_SETUP_CONFIRM:
2202 wpa_tdls_process_tpk_m3(sm, src_addr, buf, len);
2203 break;
2204 case WLAN_TDLS_TEARDOWN:
2205 wpa_tdls_recv_teardown(sm, src_addr, buf, len);
2206 break;
2207 case WLAN_TDLS_DISCOVERY_REQUEST:
2208 wpa_tdls_process_discovery_request(sm, src_addr, buf, len);
2209 break;
2210 default:
2211 /* Kernel code will process remaining frames */
2212 wpa_printf(MSG_DEBUG, "TDLS: Ignore TDLS frame action code %u",
2213 tf->action);
2214 break;
2215 }
2216 }
2217
2218
2219 /**
2220 * wpa_tdls_init - Initialize driver interface parameters for TDLS
2221 * @wpa_s: Pointer to wpa_supplicant data
2222 * Returns: 0 on success, -1 on failure
2223 *
2224 * This function is called to initialize driver interface parameters for TDLS.
2225 * wpa_drv_init() must have been called before this function to initialize the
2226 * driver interface.
2227 */
wpa_tdls_init(struct wpa_sm * sm)2228 int wpa_tdls_init(struct wpa_sm *sm)
2229 {
2230 if (sm == NULL)
2231 return -1;
2232
2233 sm->l2_tdls = l2_packet_init(sm->bridge_ifname ? sm->bridge_ifname :
2234 sm->ifname,
2235 sm->own_addr,
2236 ETH_P_80211_ENCAP, wpa_supplicant_rx_tdls,
2237 sm, 0);
2238 if (sm->l2_tdls == NULL) {
2239 wpa_printf(MSG_ERROR, "TDLS: Failed to open l2_packet "
2240 "connection");
2241 return -1;
2242 }
2243
2244 /*
2245 * Drivers that support TDLS but don't implement the get_capa callback
2246 * are assumed to perform everything internally
2247 */
2248 if (wpa_sm_tdls_get_capa(sm, &sm->tdls_supported,
2249 &sm->tdls_external_setup) < 0) {
2250 sm->tdls_supported = 1;
2251 sm->tdls_external_setup = 0;
2252 }
2253
2254 wpa_printf(MSG_DEBUG, "TDLS: TDLS operation%s supported by "
2255 "driver", sm->tdls_supported ? "" : " not");
2256 wpa_printf(MSG_DEBUG, "TDLS: Driver uses %s link setup",
2257 sm->tdls_external_setup ? "external" : "internal");
2258
2259 return 0;
2260 }
2261
2262
wpa_tdls_remove_peers(struct wpa_sm * sm)2263 static void wpa_tdls_remove_peers(struct wpa_sm *sm)
2264 {
2265 struct wpa_tdls_peer *peer, *tmp;
2266
2267 peer = sm->tdls;
2268 sm->tdls = NULL;
2269
2270 while (peer) {
2271 int res;
2272 tmp = peer->next;
2273 res = wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2274 wpa_printf(MSG_DEBUG, "TDLS: Remove peer " MACSTR " (res=%d)",
2275 MAC2STR(peer->addr), res);
2276 wpa_tdls_peer_free(sm, peer);
2277 os_free(peer);
2278 peer = tmp;
2279 }
2280 }
2281
2282
2283 /**
2284 * wpa_tdls_deinit - Deinitialize driver interface parameters for TDLS
2285 *
2286 * This function is called to recover driver interface parameters for TDLS
2287 * and frees resources allocated for it.
2288 */
wpa_tdls_deinit(struct wpa_sm * sm)2289 void wpa_tdls_deinit(struct wpa_sm *sm)
2290 {
2291 if (sm == NULL)
2292 return;
2293
2294 if (sm->l2_tdls)
2295 l2_packet_deinit(sm->l2_tdls);
2296 sm->l2_tdls = NULL;
2297
2298 wpa_tdls_remove_peers(sm);
2299 }
2300
2301
wpa_tdls_assoc(struct wpa_sm * sm)2302 void wpa_tdls_assoc(struct wpa_sm *sm)
2303 {
2304 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on association");
2305 wpa_tdls_remove_peers(sm);
2306 }
2307
2308
wpa_tdls_disassoc(struct wpa_sm * sm)2309 void wpa_tdls_disassoc(struct wpa_sm *sm)
2310 {
2311 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on disassociation");
2312 wpa_tdls_remove_peers(sm);
2313 }
2314
2315
wpa_tdls_prohibited(const u8 * ies,size_t len)2316 static int wpa_tdls_prohibited(const u8 *ies, size_t len)
2317 {
2318 struct wpa_eapol_ie_parse elems;
2319
2320 if (ies == NULL)
2321 return 0;
2322
2323 if (wpa_supplicant_parse_ies(ies, len, &elems) < 0)
2324 return 0;
2325
2326 if (elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5)
2327 return 0;
2328
2329 /* bit 38 - TDLS Prohibited */
2330 return !!(elems.ext_capab[2 + 4] & 0x40);
2331 }
2332
2333
wpa_tdls_ap_ies(struct wpa_sm * sm,const u8 * ies,size_t len)2334 void wpa_tdls_ap_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2335 {
2336 sm->tdls_prohibited = wpa_tdls_prohibited(ies, len);
2337 wpa_printf(MSG_DEBUG, "TDLS: TDLS is %s in the target BSS",
2338 sm->tdls_prohibited ? "prohibited" : "allowed");
2339 }
2340
2341
wpa_tdls_assoc_resp_ies(struct wpa_sm * sm,const u8 * ies,size_t len)2342 void wpa_tdls_assoc_resp_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2343 {
2344 if (!sm->tdls_prohibited && wpa_tdls_prohibited(ies, len)) {
2345 wpa_printf(MSG_DEBUG, "TDLS: TDLS prohibited based on "
2346 "(Re)Association Response IEs");
2347 sm->tdls_prohibited = 1;
2348 }
2349 }
2350
2351
wpa_tdls_enable(struct wpa_sm * sm,int enabled)2352 void wpa_tdls_enable(struct wpa_sm *sm, int enabled)
2353 {
2354 wpa_printf(MSG_DEBUG, "TDLS: %s", enabled ? "enabled" : "disabled");
2355 sm->tdls_disabled = !enabled;
2356 }
2357
2358
wpa_tdls_is_external_setup(struct wpa_sm * sm)2359 int wpa_tdls_is_external_setup(struct wpa_sm *sm)
2360 {
2361 return sm->tdls_external_setup;
2362 }
2363