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