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 struct ieee80211_ht_capabilities *ht_capabilities;
125 struct ieee80211_vht_capabilities *vht_capabilities;
126
127 u8 qos_info;
128
129 u8 *ext_capab;
130 size_t ext_capab_len;
131 };
132
133
wpa_tdls_get_privacy(struct wpa_sm * sm)134 static int wpa_tdls_get_privacy(struct wpa_sm *sm)
135 {
136 /*
137 * Get info needed from supplicant to check if the current BSS supports
138 * security. Other than OPEN mode, rest are considered secured
139 * WEP/WPA/WPA2 hence TDLS frames are processed for TPK handshake.
140 */
141 return sm->pairwise_cipher != WPA_CIPHER_NONE;
142 }
143
144
wpa_add_ie(u8 * pos,const u8 * ie,size_t ie_len)145 static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len)
146 {
147 os_memcpy(pos, ie, ie_len);
148 return pos + ie_len;
149 }
150
151
wpa_tdls_del_key(struct wpa_sm * sm,struct wpa_tdls_peer * peer)152 static int wpa_tdls_del_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
153 {
154 if (wpa_sm_set_key(sm, WPA_ALG_NONE, peer->addr,
155 0, 0, NULL, 0, NULL, 0) < 0) {
156 wpa_printf(MSG_WARNING, "TDLS: Failed to delete TPK-TK from "
157 "the driver");
158 return -1;
159 }
160
161 return 0;
162 }
163
164
wpa_tdls_set_key(struct wpa_sm * sm,struct wpa_tdls_peer * peer)165 static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
166 {
167 u8 key_len;
168 u8 rsc[6];
169 enum wpa_alg alg;
170
171 os_memset(rsc, 0, 6);
172
173 switch (peer->cipher) {
174 case WPA_CIPHER_CCMP:
175 alg = WPA_ALG_CCMP;
176 key_len = 16;
177 break;
178 case WPA_CIPHER_NONE:
179 wpa_printf(MSG_DEBUG, "TDLS: Pairwise Cipher Suite: "
180 "NONE - do not use pairwise keys");
181 return -1;
182 default:
183 wpa_printf(MSG_WARNING, "TDLS: Unsupported pairwise cipher %d",
184 sm->pairwise_cipher);
185 return -1;
186 }
187
188 if (wpa_sm_set_key(sm, alg, peer->addr, -1, 1,
189 rsc, sizeof(rsc), peer->tpk.tk, key_len) < 0) {
190 wpa_printf(MSG_WARNING, "TDLS: Failed to set TPK to the "
191 "driver");
192 return -1;
193 }
194 return 0;
195 }
196
197
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)198 static int wpa_tdls_send_tpk_msg(struct wpa_sm *sm, const u8 *dst,
199 u8 action_code, u8 dialog_token,
200 u16 status_code, const u8 *buf, size_t len)
201 {
202 return wpa_sm_send_tdls_mgmt(sm, dst, action_code, dialog_token,
203 status_code, buf, len);
204 }
205
206
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)207 static int wpa_tdls_tpk_send(struct wpa_sm *sm, const u8 *dest, u8 action_code,
208 u8 dialog_token, u16 status_code,
209 const u8 *msg, size_t msg_len)
210 {
211 struct wpa_tdls_peer *peer;
212
213 wpa_printf(MSG_DEBUG, "TDLS: TPK send dest=" MACSTR " action_code=%u "
214 "dialog_token=%u status_code=%u msg_len=%u",
215 MAC2STR(dest), action_code, dialog_token, status_code,
216 (unsigned int) msg_len);
217
218 if (wpa_tdls_send_tpk_msg(sm, dest, action_code, dialog_token,
219 status_code, msg, msg_len)) {
220 wpa_printf(MSG_INFO, "TDLS: Failed to send message "
221 "(action_code=%u)", action_code);
222 return -1;
223 }
224
225 if (action_code == WLAN_TDLS_SETUP_CONFIRM ||
226 action_code == WLAN_TDLS_TEARDOWN ||
227 action_code == WLAN_TDLS_DISCOVERY_REQUEST ||
228 action_code == WLAN_TDLS_DISCOVERY_RESPONSE)
229 return 0; /* No retries */
230
231 for (peer = sm->tdls; peer; peer = peer->next) {
232 if (os_memcmp(peer->addr, dest, ETH_ALEN) == 0)
233 break;
234 }
235
236 if (peer == NULL) {
237 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
238 "retry " MACSTR, MAC2STR(dest));
239 return 0;
240 }
241
242 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
243
244 peer->sm_tmr.count = TPK_RETRY_COUNT;
245 peer->sm_tmr.timer = TPK_TIMEOUT;
246
247 /* Copy message to resend on timeout */
248 os_memcpy(peer->sm_tmr.dest, dest, ETH_ALEN);
249 peer->sm_tmr.action_code = action_code;
250 peer->sm_tmr.dialog_token = dialog_token;
251 peer->sm_tmr.status_code = status_code;
252 peer->sm_tmr.buf_len = msg_len;
253 os_free(peer->sm_tmr.buf);
254 peer->sm_tmr.buf = os_malloc(msg_len);
255 if (peer->sm_tmr.buf == NULL)
256 return -1;
257 os_memcpy(peer->sm_tmr.buf, msg, msg_len);
258
259 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout registered "
260 "(action_code=%u)", action_code);
261 eloop_register_timeout(peer->sm_tmr.timer / 1000, 0,
262 wpa_tdls_tpk_retry_timeout, sm, peer);
263 return 0;
264 }
265
266
wpa_tdls_do_teardown(struct wpa_sm * sm,struct wpa_tdls_peer * peer,u16 reason_code,int free_peer)267 static int wpa_tdls_do_teardown(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
268 u16 reason_code, int free_peer)
269 {
270 int ret;
271
272 if (sm->tdls_external_setup) {
273 ret = wpa_tdls_send_teardown(sm, peer->addr, reason_code);
274
275 /* disable the link after teardown was sent */
276 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
277 } else {
278 ret = wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr);
279 }
280
281 if (sm->tdls_external_setup || free_peer)
282 wpa_tdls_peer_free(sm, peer);
283
284 return ret;
285 }
286
287
wpa_tdls_tpk_retry_timeout(void * eloop_ctx,void * timeout_ctx)288 static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx)
289 {
290
291 struct wpa_sm *sm = eloop_ctx;
292 struct wpa_tdls_peer *peer = timeout_ctx;
293
294 if (peer->sm_tmr.count) {
295 peer->sm_tmr.count--;
296 peer->sm_tmr.timer = TPK_TIMEOUT;
297
298 wpa_printf(MSG_INFO, "TDLS: Retrying sending of message "
299 "(action_code=%u)",
300 peer->sm_tmr.action_code);
301
302 if (peer->sm_tmr.buf == NULL) {
303 wpa_printf(MSG_INFO, "TDLS: No retry buffer available "
304 "for action_code=%u",
305 peer->sm_tmr.action_code);
306 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm,
307 peer);
308 return;
309 }
310
311 /* resend TPK Handshake Message to Peer */
312 if (wpa_tdls_send_tpk_msg(sm, peer->sm_tmr.dest,
313 peer->sm_tmr.action_code,
314 peer->sm_tmr.dialog_token,
315 peer->sm_tmr.status_code,
316 peer->sm_tmr.buf,
317 peer->sm_tmr.buf_len)) {
318 wpa_printf(MSG_INFO, "TDLS: Failed to retry "
319 "transmission");
320 }
321
322 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
323 eloop_register_timeout(peer->sm_tmr.timer / 1000, 0,
324 wpa_tdls_tpk_retry_timeout, sm, peer);
325 } else {
326 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
327
328 wpa_printf(MSG_DEBUG, "TDLS: Sending Teardown Request");
329 wpa_tdls_do_teardown(sm, peer,
330 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1);
331 }
332 }
333
334
wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm * sm,struct wpa_tdls_peer * peer,u8 action_code)335 static void wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm *sm,
336 struct wpa_tdls_peer *peer,
337 u8 action_code)
338 {
339 if (action_code == peer->sm_tmr.action_code) {
340 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout cancelled for "
341 "action_code=%u", action_code);
342
343 /* Cancel Timeout registered */
344 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
345
346 /* free all resources meant for retry */
347 os_free(peer->sm_tmr.buf);
348 peer->sm_tmr.buf = NULL;
349
350 peer->sm_tmr.count = 0;
351 peer->sm_tmr.timer = 0;
352 peer->sm_tmr.buf_len = 0;
353 peer->sm_tmr.action_code = 0xff;
354 } else {
355 wpa_printf(MSG_INFO, "TDLS: Error in cancelling retry timeout "
356 "(Unknown action_code=%u)", action_code);
357 }
358 }
359
360
wpa_tdls_generate_tpk(struct wpa_tdls_peer * peer,const u8 * own_addr,const u8 * bssid)361 static void wpa_tdls_generate_tpk(struct wpa_tdls_peer *peer,
362 const u8 *own_addr, const u8 *bssid)
363 {
364 u8 key_input[SHA256_MAC_LEN];
365 const u8 *nonce[2];
366 size_t len[2];
367 u8 data[3 * ETH_ALEN];
368
369 /* IEEE Std 802.11z-2010 8.5.9.1:
370 * TPK-Key-Input = SHA-256(min(SNonce, ANonce) || max(SNonce, ANonce))
371 */
372 len[0] = WPA_NONCE_LEN;
373 len[1] = WPA_NONCE_LEN;
374 if (os_memcmp(peer->inonce, peer->rnonce, WPA_NONCE_LEN) < 0) {
375 nonce[0] = peer->inonce;
376 nonce[1] = peer->rnonce;
377 } else {
378 nonce[0] = peer->rnonce;
379 nonce[1] = peer->inonce;
380 }
381 wpa_hexdump(MSG_DEBUG, "TDLS: min(Nonce)", nonce[0], WPA_NONCE_LEN);
382 wpa_hexdump(MSG_DEBUG, "TDLS: max(Nonce)", nonce[1], WPA_NONCE_LEN);
383 sha256_vector(2, nonce, len, key_input);
384 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-Key-Input",
385 key_input, SHA256_MAC_LEN);
386
387 /*
388 * TPK-Key-Data = KDF-N_KEY(TPK-Key-Input, "TDLS PMK",
389 * min(MAC_I, MAC_R) || max(MAC_I, MAC_R) || BSSID || N_KEY)
390 * TODO: is N_KEY really included in KDF Context and if so, in which
391 * presentation format (little endian 16-bit?) is it used? It gets
392 * added by the KDF anyway..
393 */
394
395 if (os_memcmp(own_addr, peer->addr, ETH_ALEN) < 0) {
396 os_memcpy(data, own_addr, ETH_ALEN);
397 os_memcpy(data + ETH_ALEN, peer->addr, ETH_ALEN);
398 } else {
399 os_memcpy(data, peer->addr, ETH_ALEN);
400 os_memcpy(data + ETH_ALEN, own_addr, ETH_ALEN);
401 }
402 os_memcpy(data + 2 * ETH_ALEN, bssid, ETH_ALEN);
403 wpa_hexdump(MSG_DEBUG, "TDLS: KDF Context", data, sizeof(data));
404
405 sha256_prf(key_input, SHA256_MAC_LEN, "TDLS PMK", data, sizeof(data),
406 (u8 *) &peer->tpk, sizeof(peer->tpk));
407 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-KCK",
408 peer->tpk.kck, sizeof(peer->tpk.kck));
409 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-TK",
410 peer->tpk.tk, sizeof(peer->tpk.tk));
411 peer->tpk_set = 1;
412 }
413
414
415 /**
416 * wpa_tdls_ftie_mic - Calculate TDLS FTIE MIC
417 * @kck: TPK-KCK
418 * @lnkid: Pointer to the beginning of Link Identifier IE
419 * @rsnie: Pointer to the beginning of RSN IE used for handshake
420 * @timeoutie: Pointer to the beginning of Timeout IE used for handshake
421 * @ftie: Pointer to the beginning of FT IE
422 * @mic: Pointer for writing MIC
423 *
424 * Calculate MIC for TDLS frame.
425 */
wpa_tdls_ftie_mic(const u8 * kck,u8 trans_seq,const u8 * lnkid,const u8 * rsnie,const u8 * timeoutie,const u8 * ftie,u8 * mic)426 static int wpa_tdls_ftie_mic(const u8 *kck, u8 trans_seq, const u8 *lnkid,
427 const u8 *rsnie, const u8 *timeoutie,
428 const u8 *ftie, u8 *mic)
429 {
430 u8 *buf, *pos;
431 struct wpa_tdls_ftie *_ftie;
432 const struct wpa_tdls_lnkid *_lnkid;
433 int ret;
434 int len = 2 * ETH_ALEN + 1 + 2 + lnkid[1] + 2 + rsnie[1] +
435 2 + timeoutie[1] + 2 + ftie[1];
436 buf = os_zalloc(len);
437 if (!buf) {
438 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
439 return -1;
440 }
441
442 pos = buf;
443 _lnkid = (const struct wpa_tdls_lnkid *) lnkid;
444 /* 1) TDLS initiator STA MAC address */
445 os_memcpy(pos, _lnkid->init_sta, ETH_ALEN);
446 pos += ETH_ALEN;
447 /* 2) TDLS responder STA MAC address */
448 os_memcpy(pos, _lnkid->resp_sta, ETH_ALEN);
449 pos += ETH_ALEN;
450 /* 3) Transaction Sequence number */
451 *pos++ = trans_seq;
452 /* 4) Link Identifier IE */
453 os_memcpy(pos, lnkid, 2 + lnkid[1]);
454 pos += 2 + lnkid[1];
455 /* 5) RSN IE */
456 os_memcpy(pos, rsnie, 2 + rsnie[1]);
457 pos += 2 + rsnie[1];
458 /* 6) Timeout Interval IE */
459 os_memcpy(pos, timeoutie, 2 + timeoutie[1]);
460 pos += 2 + timeoutie[1];
461 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
462 os_memcpy(pos, ftie, 2 + ftie[1]);
463 _ftie = (struct wpa_tdls_ftie *) pos;
464 os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
465 pos += 2 + ftie[1];
466
467 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
468 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
469 ret = omac1_aes_128(kck, buf, pos - buf, mic);
470 os_free(buf);
471 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
472 return ret;
473 }
474
475
476 /**
477 * wpa_tdls_key_mic_teardown - Calculate TDLS FTIE MIC for Teardown frame
478 * @kck: TPK-KCK
479 * @trans_seq: Transaction Sequence Number (4 - Teardown)
480 * @rcode: Reason code for Teardown
481 * @dtoken: Dialog Token used for that particular link
482 * @lnkid: Pointer to the beginning of Link Identifier IE
483 * @ftie: Pointer to the beginning of FT IE
484 * @mic: Pointer for writing MIC
485 *
486 * Calculate MIC for TDLS frame.
487 */
wpa_tdls_key_mic_teardown(const u8 * kck,u8 trans_seq,u16 rcode,u8 dtoken,const u8 * lnkid,const u8 * ftie,u8 * mic)488 static int wpa_tdls_key_mic_teardown(const u8 *kck, u8 trans_seq, u16 rcode,
489 u8 dtoken, const u8 *lnkid,
490 const u8 *ftie, u8 *mic)
491 {
492 u8 *buf, *pos;
493 struct wpa_tdls_ftie *_ftie;
494 int ret;
495 int len;
496
497 if (lnkid == NULL)
498 return -1;
499
500 len = 2 + lnkid[1] + sizeof(rcode) + sizeof(dtoken) +
501 sizeof(trans_seq) + 2 + ftie[1];
502
503 buf = os_zalloc(len);
504 if (!buf) {
505 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
506 return -1;
507 }
508
509 pos = buf;
510 /* 1) Link Identifier IE */
511 os_memcpy(pos, lnkid, 2 + lnkid[1]);
512 pos += 2 + lnkid[1];
513 /* 2) Reason Code */
514 WPA_PUT_LE16(pos, rcode);
515 pos += sizeof(rcode);
516 /* 3) Dialog token */
517 *pos++ = dtoken;
518 /* 4) Transaction Sequence number */
519 *pos++ = trans_seq;
520 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
521 os_memcpy(pos, ftie, 2 + ftie[1]);
522 _ftie = (struct wpa_tdls_ftie *) pos;
523 os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
524 pos += 2 + ftie[1];
525
526 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
527 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
528 ret = omac1_aes_128(kck, buf, pos - buf, mic);
529 os_free(buf);
530 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
531 return ret;
532 }
533
534
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)535 static int wpa_supplicant_verify_tdls_mic(u8 trans_seq,
536 struct wpa_tdls_peer *peer,
537 const u8 *lnkid, const u8 *timeoutie,
538 const struct wpa_tdls_ftie *ftie)
539 {
540 u8 mic[16];
541
542 if (peer->tpk_set) {
543 wpa_tdls_ftie_mic(peer->tpk.kck, trans_seq, lnkid,
544 peer->rsnie_p, timeoutie, (u8 *) ftie,
545 mic);
546 if (os_memcmp(mic, ftie->mic, 16) != 0) {
547 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in FTIE - "
548 "dropping packet");
549 wpa_hexdump(MSG_DEBUG, "TDLS: Received MIC",
550 ftie->mic, 16);
551 wpa_hexdump(MSG_DEBUG, "TDLS: Calculated MIC",
552 mic, 16);
553 return -1;
554 }
555 } else {
556 wpa_printf(MSG_WARNING, "TDLS: Could not verify TDLS MIC, "
557 "TPK not set - dropping packet");
558 return -1;
559 }
560 return 0;
561 }
562
563
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)564 static int wpa_supplicant_verify_tdls_mic_teardown(
565 u8 trans_seq, u16 rcode, u8 dtoken, struct wpa_tdls_peer *peer,
566 const u8 *lnkid, const struct wpa_tdls_ftie *ftie)
567 {
568 u8 mic[16];
569
570 if (peer->tpk_set) {
571 wpa_tdls_key_mic_teardown(peer->tpk.kck, trans_seq, rcode,
572 dtoken, lnkid, (u8 *) ftie, mic);
573 if (os_memcmp(mic, ftie->mic, 16) != 0) {
574 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in Teardown - "
575 "dropping packet");
576 return -1;
577 }
578 } else {
579 wpa_printf(MSG_INFO, "TDLS: Could not verify TDLS Teardown "
580 "MIC, TPK not set - dropping packet");
581 return -1;
582 }
583 return 0;
584 }
585
586
wpa_tdls_tpk_timeout(void * eloop_ctx,void * timeout_ctx)587 static void wpa_tdls_tpk_timeout(void *eloop_ctx, void *timeout_ctx)
588 {
589 struct wpa_sm *sm = eloop_ctx;
590 struct wpa_tdls_peer *peer = timeout_ctx;
591
592 /*
593 * On TPK lifetime expiration, we have an option of either tearing down
594 * the direct link or trying to re-initiate it. The selection of what
595 * to do is not strictly speaking controlled by our role in the expired
596 * link, but for now, use that to select whether to renew or tear down
597 * the link.
598 */
599
600 if (peer->initiator) {
601 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
602 " - try to renew", MAC2STR(peer->addr));
603 wpa_tdls_start(sm, peer->addr);
604 } else {
605 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
606 " - tear down", MAC2STR(peer->addr));
607 wpa_tdls_do_teardown(sm, peer,
608 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1);
609 }
610 }
611
612
wpa_tdls_peer_free(struct wpa_sm * sm,struct wpa_tdls_peer * peer)613 static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
614 {
615 wpa_printf(MSG_DEBUG, "TDLS: Clear state for peer " MACSTR,
616 MAC2STR(peer->addr));
617 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
618 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
619 peer->initiator = 0;
620 os_free(peer->sm_tmr.buf);
621 peer->sm_tmr.buf = NULL;
622 os_free(peer->ht_capabilities);
623 peer->ht_capabilities = NULL;
624 os_free(peer->vht_capabilities);
625 peer->vht_capabilities = NULL;
626 os_free(peer->ext_capab);
627 peer->ext_capab = NULL;
628 peer->rsnie_i_len = peer->rsnie_p_len = 0;
629 peer->cipher = 0;
630 peer->tpk_set = peer->tpk_success = 0;
631 os_memset(&peer->tpk, 0, sizeof(peer->tpk));
632 os_memset(peer->inonce, 0, WPA_NONCE_LEN);
633 os_memset(peer->rnonce, 0, WPA_NONCE_LEN);
634 }
635
636
wpa_tdls_linkid(struct wpa_sm * sm,struct wpa_tdls_peer * peer,struct wpa_tdls_lnkid * lnkid)637 static void wpa_tdls_linkid(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
638 struct wpa_tdls_lnkid *lnkid)
639 {
640 lnkid->ie_type = WLAN_EID_LINK_ID;
641 lnkid->ie_len = 3 * ETH_ALEN;
642 os_memcpy(lnkid->bssid, sm->bssid, ETH_ALEN);
643 if (peer->initiator) {
644 os_memcpy(lnkid->init_sta, sm->own_addr, ETH_ALEN);
645 os_memcpy(lnkid->resp_sta, peer->addr, ETH_ALEN);
646 } else {
647 os_memcpy(lnkid->init_sta, peer->addr, ETH_ALEN);
648 os_memcpy(lnkid->resp_sta, sm->own_addr, ETH_ALEN);
649 }
650 }
651
652
wpa_tdls_send_teardown(struct wpa_sm * sm,const u8 * addr,u16 reason_code)653 int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr, u16 reason_code)
654 {
655 struct wpa_tdls_peer *peer;
656 struct wpa_tdls_ftie *ftie;
657 struct wpa_tdls_lnkid lnkid;
658 u8 dialog_token;
659 u8 *rbuf, *pos;
660 int ielen;
661
662 if (sm->tdls_disabled || !sm->tdls_supported)
663 return -1;
664
665 /* Find the node and free from the list */
666 for (peer = sm->tdls; peer; peer = peer->next) {
667 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
668 break;
669 }
670
671 if (peer == NULL) {
672 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
673 "Teardown " MACSTR, MAC2STR(addr));
674 return 0;
675 }
676
677 dialog_token = peer->dtoken;
678
679 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown for " MACSTR,
680 MAC2STR(addr));
681
682 ielen = 0;
683 if (wpa_tdls_get_privacy(sm) && peer->tpk_set && peer->tpk_success) {
684 /* To add FTIE for Teardown request and compute MIC */
685 ielen += sizeof(*ftie);
686 #ifdef CONFIG_TDLS_TESTING
687 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
688 ielen += 170;
689 #endif /* CONFIG_TDLS_TESTING */
690 }
691
692 rbuf = os_zalloc(ielen + 1);
693 if (rbuf == NULL)
694 return -1;
695 pos = rbuf;
696
697 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success) {
698 if (reason_code != WLAN_REASON_DEAUTH_LEAVING) {
699 /* Overwrite the reason code */
700 reason_code = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
701 }
702 goto skip_ies;
703 }
704
705 ftie = (struct wpa_tdls_ftie *) pos;
706 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
707 /* Using the recent nonce which should be for CONFIRM frame */
708 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
709 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
710 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
711 pos = (u8 *) (ftie + 1);
712 #ifdef CONFIG_TDLS_TESTING
713 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
714 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
715 "FTIE");
716 ftie->ie_len += 170;
717 *pos++ = 255; /* FTIE subelem */
718 *pos++ = 168; /* FTIE subelem length */
719 pos += 168;
720 }
721 #endif /* CONFIG_TDLS_TESTING */
722 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TDLS Teardown handshake",
723 (u8 *) ftie, pos - (u8 *) ftie);
724
725 /* compute MIC before sending */
726 wpa_tdls_linkid(sm, peer, &lnkid);
727 wpa_tdls_key_mic_teardown(peer->tpk.kck, 4, reason_code,
728 dialog_token, (u8 *) &lnkid, (u8 *) ftie,
729 ftie->mic);
730
731 skip_ies:
732 /* TODO: register for a Timeout handler, if Teardown is not received at
733 * the other end, then try again another time */
734
735 /* request driver to send Teardown using this FTIE */
736 wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_TEARDOWN, 0,
737 reason_code, rbuf, 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,int * existing)889 wpa_tdls_add_peer(struct wpa_sm *sm, const u8 *addr, int *existing)
890 {
891 struct wpa_tdls_peer *peer;
892
893 if (existing)
894 *existing = 0;
895 for (peer = sm->tdls; peer; peer = peer->next) {
896 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) {
897 if (existing)
898 *existing = 1;
899 return peer; /* re-use existing entry */
900 }
901 }
902
903 wpa_printf(MSG_INFO, "TDLS: Creating peer entry for " MACSTR,
904 MAC2STR(addr));
905
906 peer = os_zalloc(sizeof(*peer));
907 if (peer == NULL)
908 return NULL;
909
910 os_memcpy(peer->addr, addr, ETH_ALEN);
911 peer->next = sm->tdls;
912 sm->tdls = peer;
913
914 return peer;
915 }
916
917
wpa_tdls_send_tpk_m1(struct wpa_sm * sm,struct wpa_tdls_peer * peer)918 static int wpa_tdls_send_tpk_m1(struct wpa_sm *sm,
919 struct wpa_tdls_peer *peer)
920 {
921 size_t buf_len;
922 struct wpa_tdls_timeoutie timeoutie;
923 u16 rsn_capab;
924 struct wpa_tdls_ftie *ftie;
925 u8 *rbuf, *pos, *count_pos;
926 u16 count;
927 struct rsn_ie_hdr *hdr;
928
929 if (!wpa_tdls_get_privacy(sm)) {
930 wpa_printf(MSG_DEBUG, "TDLS: No security used on the link");
931 peer->rsnie_i_len = 0;
932 goto skip_rsnie;
933 }
934
935 /*
936 * TPK Handshake Message 1:
937 * FTIE: ANonce=0, SNonce=initiator nonce MIC=0, DataKDs=(RSNIE_I,
938 * Timeout Interval IE))
939 */
940
941 /* Filling RSN IE */
942 hdr = (struct rsn_ie_hdr *) peer->rsnie_i;
943 hdr->elem_id = WLAN_EID_RSN;
944 WPA_PUT_LE16(hdr->version, RSN_VERSION);
945
946 pos = (u8 *) (hdr + 1);
947 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
948 pos += RSN_SELECTOR_LEN;
949 count_pos = pos;
950 pos += 2;
951
952 count = 0;
953
954 /*
955 * AES-CCMP is the default Encryption preferred for TDLS, so
956 * RSN IE is filled only with CCMP CIPHER
957 * Note: TKIP is not used to encrypt TDLS link.
958 *
959 * Regardless of the cipher used on the AP connection, select CCMP
960 * here.
961 */
962 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
963 pos += RSN_SELECTOR_LEN;
964 count++;
965
966 WPA_PUT_LE16(count_pos, count);
967
968 WPA_PUT_LE16(pos, 1);
969 pos += 2;
970 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
971 pos += RSN_SELECTOR_LEN;
972
973 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
974 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
975 #ifdef CONFIG_TDLS_TESTING
976 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
977 wpa_printf(MSG_DEBUG, "TDLS: Use alternative RSN IE for "
978 "testing");
979 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
980 }
981 #endif /* CONFIG_TDLS_TESTING */
982 WPA_PUT_LE16(pos, rsn_capab);
983 pos += 2;
984 #ifdef CONFIG_TDLS_TESTING
985 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
986 /* Number of PMKIDs */
987 *pos++ = 0x00;
988 *pos++ = 0x00;
989 }
990 #endif /* CONFIG_TDLS_TESTING */
991
992 hdr->len = (pos - peer->rsnie_i) - 2;
993 peer->rsnie_i_len = pos - peer->rsnie_i;
994 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
995 peer->rsnie_i, peer->rsnie_i_len);
996
997 skip_rsnie:
998 buf_len = 0;
999 if (wpa_tdls_get_privacy(sm))
1000 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1001 sizeof(struct wpa_tdls_timeoutie);
1002 #ifdef CONFIG_TDLS_TESTING
1003 if (wpa_tdls_get_privacy(sm) &&
1004 (tdls_testing & TDLS_TESTING_LONG_FRAME))
1005 buf_len += 170;
1006 if (tdls_testing & TDLS_TESTING_DIFF_BSSID)
1007 buf_len += sizeof(struct wpa_tdls_lnkid);
1008 #endif /* CONFIG_TDLS_TESTING */
1009 rbuf = os_zalloc(buf_len + 1);
1010 if (rbuf == NULL) {
1011 wpa_tdls_peer_free(sm, peer);
1012 return -1;
1013 }
1014 pos = rbuf;
1015
1016 if (!wpa_tdls_get_privacy(sm))
1017 goto skip_ies;
1018
1019 /* Initiator RSN IE */
1020 pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len);
1021
1022 ftie = (struct wpa_tdls_ftie *) pos;
1023 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1024 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1025
1026 if (os_get_random(peer->inonce, WPA_NONCE_LEN)) {
1027 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1028 "TDLS: Failed to get random data for initiator Nonce");
1029 os_free(rbuf);
1030 wpa_tdls_peer_free(sm, peer);
1031 return -1;
1032 }
1033 wpa_hexdump(MSG_DEBUG, "TDLS: Initiator Nonce for TPK handshake",
1034 peer->inonce, WPA_NONCE_LEN);
1035 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1036
1037 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK Handshake M1",
1038 (u8 *) ftie, sizeof(struct wpa_tdls_ftie));
1039
1040 pos = (u8 *) (ftie + 1);
1041
1042 #ifdef CONFIG_TDLS_TESTING
1043 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1044 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1045 "FTIE");
1046 ftie->ie_len += 170;
1047 *pos++ = 255; /* FTIE subelem */
1048 *pos++ = 168; /* FTIE subelem length */
1049 pos += 168;
1050 }
1051 #endif /* CONFIG_TDLS_TESTING */
1052
1053 /* Lifetime */
1054 peer->lifetime = TPK_LIFETIME;
1055 #ifdef CONFIG_TDLS_TESTING
1056 if (tdls_testing & TDLS_TESTING_SHORT_LIFETIME) {
1057 wpa_printf(MSG_DEBUG, "TDLS: Testing - use short TPK "
1058 "lifetime");
1059 peer->lifetime = 301;
1060 }
1061 if (tdls_testing & TDLS_TESTING_LONG_LIFETIME) {
1062 wpa_printf(MSG_DEBUG, "TDLS: Testing - use long TPK "
1063 "lifetime");
1064 peer->lifetime = 0xffffffff;
1065 }
1066 #endif /* CONFIG_TDLS_TESTING */
1067 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1068 sizeof(timeoutie), peer->lifetime);
1069 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime);
1070
1071 skip_ies:
1072
1073 #ifdef CONFIG_TDLS_TESTING
1074 if (tdls_testing & TDLS_TESTING_DIFF_BSSID) {
1075 wpa_printf(MSG_DEBUG, "TDLS: Testing - use incorrect BSSID in "
1076 "Link Identifier");
1077 struct wpa_tdls_lnkid *l = (struct wpa_tdls_lnkid *) pos;
1078 wpa_tdls_linkid(sm, peer, l);
1079 l->bssid[5] ^= 0x01;
1080 pos += sizeof(*l);
1081 }
1082 #endif /* CONFIG_TDLS_TESTING */
1083
1084 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Request / TPK "
1085 "Handshake Message 1 (peer " MACSTR ")",
1086 MAC2STR(peer->addr));
1087
1088 wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_SETUP_REQUEST, 1, 0,
1089 rbuf, pos - rbuf);
1090 os_free(rbuf);
1091
1092 return 0;
1093 }
1094
1095
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)1096 static int wpa_tdls_send_tpk_m2(struct wpa_sm *sm,
1097 const unsigned char *src_addr, u8 dtoken,
1098 struct wpa_tdls_lnkid *lnkid,
1099 const struct wpa_tdls_peer *peer)
1100 {
1101 u8 *rbuf, *pos;
1102 size_t buf_len;
1103 u32 lifetime;
1104 struct wpa_tdls_timeoutie timeoutie;
1105 struct wpa_tdls_ftie *ftie;
1106
1107 buf_len = 0;
1108 if (wpa_tdls_get_privacy(sm)) {
1109 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1110 * Lifetime */
1111 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1112 sizeof(struct wpa_tdls_timeoutie);
1113 #ifdef CONFIG_TDLS_TESTING
1114 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1115 buf_len += 170;
1116 #endif /* CONFIG_TDLS_TESTING */
1117 }
1118
1119 rbuf = os_zalloc(buf_len + 1);
1120 if (rbuf == NULL)
1121 return -1;
1122 pos = rbuf;
1123
1124 if (!wpa_tdls_get_privacy(sm))
1125 goto skip_ies;
1126
1127 /* Peer RSN IE */
1128 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1129
1130 ftie = (struct wpa_tdls_ftie *) pos;
1131 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1132 /* TODO: ftie->mic_control to set 2-RESPONSE */
1133 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1134 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1135 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1136 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK M2",
1137 (u8 *) ftie, sizeof(*ftie));
1138
1139 pos = (u8 *) (ftie + 1);
1140
1141 #ifdef CONFIG_TDLS_TESTING
1142 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1143 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1144 "FTIE");
1145 ftie->ie_len += 170;
1146 *pos++ = 255; /* FTIE subelem */
1147 *pos++ = 168; /* FTIE subelem length */
1148 pos += 168;
1149 }
1150 #endif /* CONFIG_TDLS_TESTING */
1151
1152 /* Lifetime */
1153 lifetime = peer->lifetime;
1154 #ifdef CONFIG_TDLS_TESTING
1155 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_RESP) {
1156 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1157 "lifetime in response");
1158 lifetime++;
1159 }
1160 #endif /* CONFIG_TDLS_TESTING */
1161 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1162 sizeof(timeoutie), lifetime);
1163 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds from initiator",
1164 lifetime);
1165
1166 /* compute MIC before sending */
1167 wpa_tdls_ftie_mic(peer->tpk.kck, 2, (u8 *) lnkid, peer->rsnie_p,
1168 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1169
1170 skip_ies:
1171 wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0,
1172 rbuf, pos - rbuf);
1173 os_free(rbuf);
1174
1175 return 0;
1176 }
1177
1178
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)1179 static int wpa_tdls_send_tpk_m3(struct wpa_sm *sm,
1180 const unsigned char *src_addr, u8 dtoken,
1181 struct wpa_tdls_lnkid *lnkid,
1182 const struct wpa_tdls_peer *peer)
1183 {
1184 u8 *rbuf, *pos;
1185 size_t buf_len;
1186 struct wpa_tdls_ftie *ftie;
1187 struct wpa_tdls_timeoutie timeoutie;
1188 u32 lifetime;
1189
1190 buf_len = 0;
1191 if (wpa_tdls_get_privacy(sm)) {
1192 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1193 * Lifetime */
1194 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1195 sizeof(struct wpa_tdls_timeoutie);
1196 #ifdef CONFIG_TDLS_TESTING
1197 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1198 buf_len += 170;
1199 #endif /* CONFIG_TDLS_TESTING */
1200 }
1201
1202 rbuf = os_zalloc(buf_len + 1);
1203 if (rbuf == NULL)
1204 return -1;
1205 pos = rbuf;
1206
1207 if (!wpa_tdls_get_privacy(sm))
1208 goto skip_ies;
1209
1210 /* Peer RSN IE */
1211 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1212
1213 ftie = (struct wpa_tdls_ftie *) pos;
1214 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1215 /*TODO: ftie->mic_control to set 3-CONFIRM */
1216 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1217 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1218 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1219
1220 pos = (u8 *) (ftie + 1);
1221
1222 #ifdef CONFIG_TDLS_TESTING
1223 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1224 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1225 "FTIE");
1226 ftie->ie_len += 170;
1227 *pos++ = 255; /* FTIE subelem */
1228 *pos++ = 168; /* FTIE subelem length */
1229 pos += 168;
1230 }
1231 #endif /* CONFIG_TDLS_TESTING */
1232
1233 /* Lifetime */
1234 lifetime = peer->lifetime;
1235 #ifdef CONFIG_TDLS_TESTING
1236 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_CONF) {
1237 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1238 "lifetime in confirm");
1239 lifetime++;
1240 }
1241 #endif /* CONFIG_TDLS_TESTING */
1242 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1243 sizeof(timeoutie), lifetime);
1244 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds",
1245 lifetime);
1246
1247 /* compute MIC before sending */
1248 wpa_tdls_ftie_mic(peer->tpk.kck, 3, (u8 *) lnkid, peer->rsnie_p,
1249 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1250
1251 skip_ies:
1252 wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 0,
1253 rbuf, pos - rbuf);
1254 os_free(rbuf);
1255
1256 return 0;
1257 }
1258
1259
wpa_tdls_send_discovery_response(struct wpa_sm * sm,struct wpa_tdls_peer * peer,u8 dialog_token)1260 static int wpa_tdls_send_discovery_response(struct wpa_sm *sm,
1261 struct wpa_tdls_peer *peer,
1262 u8 dialog_token)
1263 {
1264 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Discovery Response "
1265 "(peer " MACSTR ")", MAC2STR(peer->addr));
1266
1267 return wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_DISCOVERY_RESPONSE,
1268 dialog_token, 0, NULL, 0);
1269 }
1270
1271
1272 static int
wpa_tdls_process_discovery_request(struct wpa_sm * sm,const u8 * addr,const u8 * buf,size_t len)1273 wpa_tdls_process_discovery_request(struct wpa_sm *sm, const u8 *addr,
1274 const u8 *buf, size_t len)
1275 {
1276 struct wpa_eapol_ie_parse kde;
1277 const struct wpa_tdls_lnkid *lnkid;
1278 struct wpa_tdls_peer *peer;
1279 size_t min_req_len = sizeof(struct wpa_tdls_frame) +
1280 1 /* dialog token */ + sizeof(struct wpa_tdls_lnkid);
1281 u8 dialog_token;
1282
1283 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from " MACSTR,
1284 MAC2STR(addr));
1285
1286 if (len < min_req_len) {
1287 wpa_printf(MSG_DEBUG, "TDLS Discovery Request is too short: "
1288 "%d", (int) len);
1289 return -1;
1290 }
1291
1292 dialog_token = buf[sizeof(struct wpa_tdls_frame)];
1293
1294 if (wpa_supplicant_parse_ies(buf + sizeof(struct wpa_tdls_frame) + 1,
1295 len - (sizeof(struct wpa_tdls_frame) + 1),
1296 &kde) < 0)
1297 return -1;
1298
1299 if (!kde.lnkid) {
1300 wpa_printf(MSG_DEBUG, "TDLS: Link ID not found in Discovery "
1301 "Request");
1302 return -1;
1303 }
1304
1305 lnkid = (const struct wpa_tdls_lnkid *) kde.lnkid;
1306
1307 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1308 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from different "
1309 " BSS " MACSTR, MAC2STR(lnkid->bssid));
1310 return -1;
1311 }
1312
1313 peer = wpa_tdls_add_peer(sm, addr, NULL);
1314 if (peer == NULL)
1315 return -1;
1316
1317 return wpa_tdls_send_discovery_response(sm, peer, dialog_token);
1318 }
1319
1320
wpa_tdls_send_discovery_request(struct wpa_sm * sm,const u8 * addr)1321 int wpa_tdls_send_discovery_request(struct wpa_sm *sm, const u8 *addr)
1322 {
1323 if (sm->tdls_disabled || !sm->tdls_supported)
1324 return -1;
1325
1326 wpa_printf(MSG_DEBUG, "TDLS: Sending Discovery Request to peer "
1327 MACSTR, MAC2STR(addr));
1328 return wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_DISCOVERY_REQUEST,
1329 1, 0, NULL, 0);
1330 }
1331
1332
copy_supp_rates(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1333 static int copy_supp_rates(const struct wpa_eapol_ie_parse *kde,
1334 struct wpa_tdls_peer *peer)
1335 {
1336 if (!kde->supp_rates) {
1337 wpa_printf(MSG_DEBUG, "TDLS: No supported rates received");
1338 return -1;
1339 }
1340 peer->supp_rates_len = merge_byte_arrays(
1341 peer->supp_rates, sizeof(peer->supp_rates),
1342 kde->supp_rates + 2, kde->supp_rates_len - 2,
1343 kde->ext_supp_rates + 2, kde->ext_supp_rates_len - 2);
1344 return 0;
1345 }
1346
1347
copy_peer_ht_capab(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1348 static int copy_peer_ht_capab(const struct wpa_eapol_ie_parse *kde,
1349 struct wpa_tdls_peer *peer)
1350 {
1351 if (!kde->ht_capabilities ||
1352 kde->ht_capabilities_len <
1353 sizeof(struct ieee80211_ht_capabilities) ) {
1354 wpa_printf(MSG_DEBUG, "TDLS: No supported ht capabilities "
1355 "received");
1356 return 0;
1357 }
1358
1359 if (!peer->ht_capabilities) {
1360 peer->ht_capabilities =
1361 os_zalloc(sizeof(struct ieee80211_ht_capabilities));
1362 if (peer->ht_capabilities == NULL)
1363 return -1;
1364 }
1365
1366 os_memcpy(peer->ht_capabilities, kde->ht_capabilities,
1367 sizeof(struct ieee80211_ht_capabilities));
1368 wpa_hexdump(MSG_DEBUG, "TDLS: Peer HT capabilities",
1369 (u8 *) peer->ht_capabilities,
1370 sizeof(struct ieee80211_ht_capabilities));
1371
1372 return 0;
1373 }
1374
1375
copy_peer_vht_capab(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1376 static int copy_peer_vht_capab(const struct wpa_eapol_ie_parse *kde,
1377 struct wpa_tdls_peer *peer)
1378 {
1379 if (!kde->vht_capabilities ||
1380 kde->vht_capabilities_len <
1381 sizeof(struct ieee80211_vht_capabilities) ) {
1382 wpa_printf(MSG_DEBUG, "TDLS: No supported vht capabilities "
1383 "received");
1384 return 0;
1385 }
1386
1387 if (!peer->vht_capabilities) {
1388 peer->vht_capabilities =
1389 os_zalloc(sizeof(struct ieee80211_vht_capabilities));
1390 if (peer->vht_capabilities == NULL)
1391 return -1;
1392 }
1393
1394 os_memcpy(peer->vht_capabilities, kde->vht_capabilities,
1395 sizeof(struct ieee80211_vht_capabilities));
1396 wpa_hexdump(MSG_DEBUG, "TDLS: Peer VHT capabilities",
1397 (u8 *) peer->vht_capabilities,
1398 sizeof(struct ieee80211_vht_capabilities));
1399
1400 return 0;
1401 }
1402
1403
copy_peer_ext_capab(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1404 static int copy_peer_ext_capab(const struct wpa_eapol_ie_parse *kde,
1405 struct wpa_tdls_peer *peer)
1406 {
1407 if (!kde->ext_capab) {
1408 wpa_printf(MSG_DEBUG, "TDLS: No extended capabilities "
1409 "received");
1410 return 0;
1411 }
1412
1413 if (!peer->ext_capab || peer->ext_capab_len < kde->ext_capab_len - 2) {
1414 /* Need to allocate buffer to fit the new information */
1415 os_free(peer->ext_capab);
1416 peer->ext_capab = os_zalloc(kde->ext_capab_len - 2);
1417 if (peer->ext_capab == NULL)
1418 return -1;
1419 }
1420
1421 peer->ext_capab_len = kde->ext_capab_len - 2;
1422 os_memcpy(peer->ext_capab, kde->ext_capab + 2, peer->ext_capab_len);
1423
1424 return 0;
1425 }
1426
1427
wpa_tdls_process_tpk_m1(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)1428 static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr,
1429 const u8 *buf, size_t len)
1430 {
1431 struct wpa_tdls_peer *peer;
1432 struct wpa_eapol_ie_parse kde;
1433 struct wpa_ie_data ie;
1434 int cipher;
1435 const u8 *cpos;
1436 struct wpa_tdls_ftie *ftie = NULL;
1437 struct wpa_tdls_timeoutie *timeoutie;
1438 struct wpa_tdls_lnkid *lnkid;
1439 u32 lifetime = 0;
1440 #if 0
1441 struct rsn_ie_hdr *hdr;
1442 u8 *pos;
1443 u16 rsn_capab;
1444 u16 rsn_ver;
1445 #endif
1446 u8 dtoken;
1447 u16 ielen;
1448 u16 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
1449 int tdls_prohibited = sm->tdls_prohibited;
1450 int existing_peer = 0;
1451
1452 if (len < 3 + 3)
1453 return -1;
1454
1455 cpos = buf;
1456 cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1457
1458 /* driver had already verified the frame format */
1459 dtoken = *cpos++; /* dialog token */
1460
1461 wpa_printf(MSG_INFO, "TDLS: Dialog Token in TPK M1 %d", dtoken);
1462
1463 peer = wpa_tdls_add_peer(sm, src_addr, &existing_peer);
1464 if (peer == NULL)
1465 goto error;
1466
1467 /* If found, use existing entry instead of adding a new one;
1468 * how to handle the case where both ends initiate at the
1469 * same time? */
1470 if (existing_peer) {
1471 if (peer->tpk_success) {
1472 wpa_printf(MSG_DEBUG, "TDLS: TDLS Setup Request while "
1473 "direct link is enabled - tear down the "
1474 "old link first");
1475 #if 0
1476 /* TODO: Disabling the link would be more proper
1477 * operation here, but it seems to trigger a race with
1478 * some drivers handling the new request frame. */
1479 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1480 #else
1481 if (sm->tdls_external_setup)
1482 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK,
1483 src_addr);
1484 else
1485 wpa_tdls_del_key(sm, peer);
1486 #endif
1487 wpa_tdls_peer_free(sm, peer);
1488 }
1489
1490 /*
1491 * An entry is already present, so check if we already sent a
1492 * TDLS Setup Request. If so, compare MAC addresses and let the
1493 * STA with the lower MAC address continue as the initiator.
1494 * The other negotiation is terminated.
1495 */
1496 if (peer->initiator) {
1497 if (os_memcmp(sm->own_addr, src_addr, ETH_ALEN) < 0) {
1498 wpa_printf(MSG_DEBUG, "TDLS: Discard request "
1499 "from peer with higher address "
1500 MACSTR, MAC2STR(src_addr));
1501 return -1;
1502 } else {
1503 wpa_printf(MSG_DEBUG, "TDLS: Accept request "
1504 "from peer with lower address "
1505 MACSTR " (terminate previously "
1506 "initiated negotiation",
1507 MAC2STR(src_addr));
1508 if (sm->tdls_external_setup)
1509 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK,
1510 src_addr);
1511 else
1512 wpa_tdls_del_key(sm, peer);
1513 wpa_tdls_peer_free(sm, peer);
1514 }
1515 }
1516 }
1517
1518 /* capability information */
1519 peer->capability = WPA_GET_LE16(cpos);
1520 cpos += 2;
1521
1522 ielen = len - (cpos - buf); /* start of IE in buf */
1523 if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0) {
1524 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M1");
1525 goto error;
1526 }
1527
1528 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1529 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
1530 "TPK M1");
1531 goto error;
1532 }
1533 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M1",
1534 kde.lnkid, kde.lnkid_len);
1535 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1536 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1537 wpa_printf(MSG_INFO, "TDLS: TPK M1 from diff BSS");
1538 status = WLAN_STATUS_NOT_IN_SAME_BSS;
1539 goto error;
1540 }
1541
1542 wpa_printf(MSG_DEBUG, "TDLS: TPK M1 - TPK initiator " MACSTR,
1543 MAC2STR(src_addr));
1544
1545 if (copy_supp_rates(&kde, peer) < 0)
1546 goto error;
1547
1548 if (copy_peer_ht_capab(&kde, peer) < 0)
1549 goto error;
1550
1551 if (copy_peer_vht_capab(&kde, peer) < 0)
1552 goto error;
1553
1554 if (copy_peer_ext_capab(&kde, peer) < 0)
1555 goto error;
1556
1557 peer->qos_info = kde.qosinfo;
1558
1559 #ifdef CONFIG_TDLS_TESTING
1560 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
1561 peer = wpa_tdls_add_peer(sm, src_addr, NULL);
1562 if (peer == NULL)
1563 goto error;
1564 wpa_printf(MSG_DEBUG, "TDLS: Testing concurrent initiation of "
1565 "TDLS setup - send own request");
1566 peer->initiator = 1;
1567 wpa_tdls_send_tpk_m1(sm, peer);
1568 }
1569
1570 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
1571 tdls_prohibited) {
1572 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
1573 "on TDLS");
1574 tdls_prohibited = 0;
1575 }
1576 #endif /* CONFIG_TDLS_TESTING */
1577
1578 if (tdls_prohibited) {
1579 wpa_printf(MSG_INFO, "TDLS: TDLS prohibited in this BSS");
1580 status = WLAN_STATUS_REQUEST_DECLINED;
1581 goto error;
1582 }
1583
1584 if (!wpa_tdls_get_privacy(sm)) {
1585 if (kde.rsn_ie) {
1586 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M1 while "
1587 "security is disabled");
1588 status = WLAN_STATUS_SECURITY_DISABLED;
1589 goto error;
1590 }
1591 goto skip_rsn;
1592 }
1593
1594 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
1595 kde.rsn_ie == NULL) {
1596 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M1");
1597 status = WLAN_STATUS_INVALID_PARAMETERS;
1598 goto error;
1599 }
1600
1601 if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
1602 wpa_printf(MSG_INFO, "TDLS: Too long Initiator RSN IE in "
1603 "TPK M1");
1604 status = WLAN_STATUS_INVALID_RSNIE;
1605 goto error;
1606 }
1607
1608 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
1609 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M1");
1610 status = WLAN_STATUS_INVALID_RSNIE;
1611 goto error;
1612 }
1613
1614 cipher = ie.pairwise_cipher;
1615 if (cipher & WPA_CIPHER_CCMP) {
1616 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
1617 cipher = WPA_CIPHER_CCMP;
1618 } else {
1619 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M1");
1620 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
1621 goto error;
1622 }
1623
1624 if ((ie.capabilities &
1625 (WPA_CAPABILITY_NO_PAIRWISE | WPA_CAPABILITY_PEERKEY_ENABLED)) !=
1626 WPA_CAPABILITY_PEERKEY_ENABLED) {
1627 wpa_printf(MSG_INFO, "TDLS: Invalid RSN Capabilities in "
1628 "TPK M1");
1629 status = WLAN_STATUS_INVALID_RSN_IE_CAPAB;
1630 goto error;
1631 }
1632
1633 /* Lifetime */
1634 if (kde.key_lifetime == NULL) {
1635 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1");
1636 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1637 goto error;
1638 }
1639 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
1640 lifetime = WPA_GET_LE32(timeoutie->value);
1641 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime);
1642 if (lifetime < 300) {
1643 wpa_printf(MSG_INFO, "TDLS: Too short TPK lifetime");
1644 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1645 goto error;
1646 }
1647
1648 skip_rsn:
1649 #ifdef CONFIG_TDLS_TESTING
1650 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
1651 if (os_memcmp(sm->own_addr, peer->addr, ETH_ALEN) < 0) {
1652 /*
1653 * The request frame from us is going to win, so do not
1654 * replace information based on this request frame from
1655 * the peer.
1656 */
1657 goto skip_rsn_check;
1658 }
1659 }
1660 #endif /* CONFIG_TDLS_TESTING */
1661
1662 peer->initiator = 0; /* Need to check */
1663 peer->dtoken = dtoken;
1664
1665 if (!wpa_tdls_get_privacy(sm)) {
1666 peer->rsnie_i_len = 0;
1667 peer->rsnie_p_len = 0;
1668 peer->cipher = WPA_CIPHER_NONE;
1669 goto skip_rsn_check;
1670 }
1671
1672 ftie = (struct wpa_tdls_ftie *) kde.ftie;
1673 os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN);
1674 os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
1675 peer->rsnie_i_len = kde.rsn_ie_len;
1676 peer->cipher = cipher;
1677
1678 if (os_get_random(peer->rnonce, WPA_NONCE_LEN)) {
1679 wpa_msg(sm->ctx->ctx, MSG_WARNING,
1680 "TDLS: Failed to get random data for responder nonce");
1681 wpa_tdls_peer_free(sm, peer);
1682 goto error;
1683 }
1684
1685 #if 0
1686 /* get version info from RSNIE received from Peer */
1687 hdr = (struct rsn_ie_hdr *) kde.rsn_ie;
1688 rsn_ver = WPA_GET_LE16(hdr->version);
1689
1690 /* use min(peer's version, out version) */
1691 if (rsn_ver > RSN_VERSION)
1692 rsn_ver = RSN_VERSION;
1693
1694 hdr = (struct rsn_ie_hdr *) peer->rsnie_p;
1695
1696 hdr->elem_id = WLAN_EID_RSN;
1697 WPA_PUT_LE16(hdr->version, rsn_ver);
1698 pos = (u8 *) (hdr + 1);
1699
1700 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
1701 pos += RSN_SELECTOR_LEN;
1702 /* Include only the selected cipher in pairwise cipher suite */
1703 WPA_PUT_LE16(pos, 1);
1704 pos += 2;
1705 if (cipher == WPA_CIPHER_CCMP)
1706 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1707 pos += RSN_SELECTOR_LEN;
1708
1709 WPA_PUT_LE16(pos, 1);
1710 pos += 2;
1711 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
1712 pos += RSN_SELECTOR_LEN;
1713
1714 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1715 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
1716 WPA_PUT_LE16(pos, rsn_capab);
1717 pos += 2;
1718
1719 hdr->len = (pos - peer->rsnie_p) - 2;
1720 peer->rsnie_p_len = pos - peer->rsnie_p;
1721 #endif
1722
1723 /* temp fix: validation of RSNIE later */
1724 os_memcpy(peer->rsnie_p, peer->rsnie_i, peer->rsnie_i_len);
1725 peer->rsnie_p_len = peer->rsnie_i_len;
1726
1727 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
1728 peer->rsnie_p, peer->rsnie_p_len);
1729
1730 peer->lifetime = lifetime;
1731
1732 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
1733
1734 skip_rsn_check:
1735 /* add the peer to the driver as a "setup in progress" peer */
1736 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, NULL, 0, NULL, NULL, 0,
1737 NULL, 0);
1738
1739 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Response / TPK M2");
1740 if (wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer) < 0) {
1741 wpa_tdls_disable_link(sm, peer->addr);
1742 goto error;
1743 }
1744
1745 return 0;
1746
1747 error:
1748 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken,
1749 status);
1750 return -1;
1751 }
1752
1753
wpa_tdls_enable_link(struct wpa_sm * sm,struct wpa_tdls_peer * peer)1754 static void wpa_tdls_enable_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
1755 {
1756 peer->tpk_success = 1;
1757 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
1758 if (wpa_tdls_get_privacy(sm)) {
1759 u32 lifetime = peer->lifetime;
1760 /*
1761 * Start the initiator process a bit earlier to avoid race
1762 * condition with the responder sending teardown request.
1763 */
1764 if (lifetime > 3 && peer->initiator)
1765 lifetime -= 3;
1766 eloop_register_timeout(lifetime, 0, wpa_tdls_tpk_timeout,
1767 sm, peer);
1768 #ifdef CONFIG_TDLS_TESTING
1769 if (tdls_testing & TDLS_TESTING_NO_TPK_EXPIRATION) {
1770 wpa_printf(MSG_DEBUG, "TDLS: Testing - disable TPK "
1771 "expiration");
1772 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
1773 }
1774 #endif /* CONFIG_TDLS_TESTING */
1775 }
1776
1777 /* add supported rates, capabilities, and qos_info to the TDLS peer */
1778 wpa_sm_tdls_peer_addset(sm, peer->addr, 0, peer->capability,
1779 peer->supp_rates, peer->supp_rates_len,
1780 peer->ht_capabilities, peer->vht_capabilities,
1781 peer->qos_info, peer->ext_capab,
1782 peer->ext_capab_len);
1783
1784 wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, peer->addr);
1785 }
1786
1787
wpa_tdls_process_tpk_m2(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)1788 static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
1789 const u8 *buf, size_t len)
1790 {
1791 struct wpa_tdls_peer *peer;
1792 struct wpa_eapol_ie_parse kde;
1793 struct wpa_ie_data ie;
1794 int cipher;
1795 struct wpa_tdls_ftie *ftie;
1796 struct wpa_tdls_timeoutie *timeoutie;
1797 struct wpa_tdls_lnkid *lnkid;
1798 u32 lifetime;
1799 u8 dtoken;
1800 int ielen;
1801 u16 status;
1802 const u8 *pos;
1803
1804 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Response / TPK M2 "
1805 "(Peer " MACSTR ")", MAC2STR(src_addr));
1806 for (peer = sm->tdls; peer; peer = peer->next) {
1807 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
1808 break;
1809 }
1810 if (peer == NULL) {
1811 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
1812 "TPK M2: " MACSTR, MAC2STR(src_addr));
1813 return -1;
1814 }
1815 if (!peer->initiator) {
1816 /*
1817 * This may happen if both devices try to initiate TDLS at the
1818 * same time and we accept the TPK M1 from the peer in
1819 * wpa_tdls_process_tpk_m1() and clear our previous state.
1820 */
1821 wpa_printf(MSG_INFO, "TDLS: We were not the initiator, so "
1822 "ignore TPK M2 from " MACSTR, MAC2STR(src_addr));
1823 return -1;
1824 }
1825 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_REQUEST);
1826
1827 if (len < 3 + 2 + 1)
1828 return -1;
1829 pos = buf;
1830 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1831 status = WPA_GET_LE16(pos);
1832 pos += 2 /* status code */;
1833
1834 if (status != WLAN_STATUS_SUCCESS) {
1835 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M2: %u",
1836 status);
1837 if (sm->tdls_external_setup)
1838 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1839 return -1;
1840 }
1841
1842 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
1843
1844 /* TODO: need to verify dialog token matches here or in kernel */
1845 dtoken = *pos++; /* dialog token */
1846
1847 wpa_printf(MSG_DEBUG, "TDLS: Dialog Token in TPK M2 %d", dtoken);
1848
1849 if (len < 3 + 2 + 1 + 2)
1850 return -1;
1851
1852 /* capability information */
1853 peer->capability = WPA_GET_LE16(pos);
1854 pos += 2;
1855
1856 ielen = len - (pos - buf); /* start of IE in buf */
1857 if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0) {
1858 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M2");
1859 goto error;
1860 }
1861
1862 #ifdef CONFIG_TDLS_TESTING
1863 if (tdls_testing & TDLS_TESTING_DECLINE_RESP) {
1864 wpa_printf(MSG_DEBUG, "TDLS: Testing - decline response");
1865 status = WLAN_STATUS_REQUEST_DECLINED;
1866 goto error;
1867 }
1868 #endif /* CONFIG_TDLS_TESTING */
1869
1870 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1871 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
1872 "TPK M2");
1873 goto error;
1874 }
1875 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M2",
1876 kde.lnkid, kde.lnkid_len);
1877 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1878
1879 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1880 wpa_printf(MSG_INFO, "TDLS: TPK M2 from different BSS");
1881 status = WLAN_STATUS_NOT_IN_SAME_BSS;
1882 goto error;
1883 }
1884
1885 if (copy_supp_rates(&kde, peer) < 0)
1886 goto error;
1887
1888 if (copy_peer_ht_capab(&kde, peer) < 0)
1889 goto error;
1890
1891 if (copy_peer_vht_capab(&kde, peer) < 0)
1892 goto error;
1893
1894 if (copy_peer_ext_capab(&kde, peer) < 0)
1895 goto error;
1896
1897 peer->qos_info = kde.qosinfo;
1898
1899 if (!wpa_tdls_get_privacy(sm)) {
1900 peer->rsnie_p_len = 0;
1901 peer->cipher = WPA_CIPHER_NONE;
1902 goto skip_rsn;
1903 }
1904
1905 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
1906 kde.rsn_ie == NULL) {
1907 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M2");
1908 status = WLAN_STATUS_INVALID_PARAMETERS;
1909 goto error;
1910 }
1911 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
1912 kde.rsn_ie, kde.rsn_ie_len);
1913
1914 /*
1915 * FIX: bitwise comparison of RSN IE is not the correct way of
1916 * validation this. It can be different, but certain fields must
1917 * match. Since we list only a single pairwise cipher in TPK M1, the
1918 * memcmp is likely to work in most cases, though.
1919 */
1920 if (kde.rsn_ie_len != peer->rsnie_i_len ||
1921 os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) != 0) {
1922 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M2 does "
1923 "not match with RSN IE used in TPK M1");
1924 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Sent in TPK M1",
1925 peer->rsnie_i, peer->rsnie_i_len);
1926 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
1927 kde.rsn_ie, kde.rsn_ie_len);
1928 status = WLAN_STATUS_INVALID_RSNIE;
1929 goto error;
1930 }
1931
1932 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
1933 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M2");
1934 status = WLAN_STATUS_INVALID_RSNIE;
1935 goto error;
1936 }
1937
1938 cipher = ie.pairwise_cipher;
1939 if (cipher == WPA_CIPHER_CCMP) {
1940 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
1941 cipher = WPA_CIPHER_CCMP;
1942 } else {
1943 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M2");
1944 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
1945 goto error;
1946 }
1947
1948 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M2",
1949 kde.ftie, sizeof(*ftie));
1950 ftie = (struct wpa_tdls_ftie *) kde.ftie;
1951
1952 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
1953 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does "
1954 "not match with FTIE SNonce used in TPK M1");
1955 /* Silently discard the frame */
1956 return -1;
1957 }
1958
1959 /* Responder Nonce and RSN IE */
1960 os_memcpy(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN);
1961 os_memcpy(peer->rsnie_p, kde.rsn_ie, kde.rsn_ie_len);
1962 peer->rsnie_p_len = kde.rsn_ie_len;
1963 peer->cipher = cipher;
1964
1965 /* Lifetime */
1966 if (kde.key_lifetime == NULL) {
1967 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M2");
1968 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1969 goto error;
1970 }
1971 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
1972 lifetime = WPA_GET_LE32(timeoutie->value);
1973 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M2",
1974 lifetime);
1975 if (lifetime != peer->lifetime) {
1976 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
1977 "TPK M2 (expected %u)", lifetime, peer->lifetime);
1978 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1979 goto error;
1980 }
1981
1982 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
1983
1984 /* Process MIC check to see if TPK M2 is right */
1985 if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid,
1986 (u8 *) timeoutie, ftie) < 0) {
1987 /* Discard the frame */
1988 wpa_tdls_del_key(sm, peer);
1989 wpa_tdls_peer_free(sm, peer);
1990 if (sm->tdls_external_setup)
1991 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1992 return -1;
1993 }
1994
1995 wpa_tdls_set_key(sm, peer);
1996
1997 skip_rsn:
1998 peer->dtoken = dtoken;
1999
2000 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Confirm / "
2001 "TPK Handshake Message 3");
2002 wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer);
2003
2004 wpa_tdls_enable_link(sm, peer);
2005
2006 return 0;
2007
2008 error:
2009 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken,
2010 status);
2011 if (sm->tdls_external_setup)
2012 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
2013 return -1;
2014 }
2015
2016
wpa_tdls_process_tpk_m3(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)2017 static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr,
2018 const u8 *buf, size_t len)
2019 {
2020 struct wpa_tdls_peer *peer;
2021 struct wpa_eapol_ie_parse kde;
2022 struct wpa_tdls_ftie *ftie;
2023 struct wpa_tdls_timeoutie *timeoutie;
2024 struct wpa_tdls_lnkid *lnkid;
2025 int ielen;
2026 u16 status;
2027 const u8 *pos;
2028 u32 lifetime;
2029
2030 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Confirm / TPK M3 "
2031 "(Peer " MACSTR ")", MAC2STR(src_addr));
2032 for (peer = sm->tdls; peer; peer = peer->next) {
2033 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
2034 break;
2035 }
2036 if (peer == NULL) {
2037 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
2038 "TPK M3: " MACSTR, MAC2STR(src_addr));
2039 return -1;
2040 }
2041 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_RESPONSE);
2042
2043 if (len < 3 + 3)
2044 return -1;
2045 pos = buf;
2046 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
2047
2048 status = WPA_GET_LE16(pos);
2049
2050 if (status != 0) {
2051 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M3: %u",
2052 status);
2053 if (sm->tdls_external_setup)
2054 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
2055 return -1;
2056 }
2057 pos += 2 /* status code */ + 1 /* dialog token */;
2058
2059 ielen = len - (pos - buf); /* start of IE in buf */
2060 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) {
2061 wpa_printf(MSG_INFO, "TDLS: Failed to parse KDEs in TPK M3");
2062 return -1;
2063 }
2064
2065 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
2066 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M3");
2067 return -1;
2068 }
2069 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M3",
2070 (u8 *) kde.lnkid, kde.lnkid_len);
2071 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
2072
2073 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
2074 wpa_printf(MSG_INFO, "TDLS: TPK M3 from diff BSS");
2075 return -1;
2076 }
2077
2078 if (!wpa_tdls_get_privacy(sm))
2079 goto skip_rsn;
2080
2081 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
2082 wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M3");
2083 return -1;
2084 }
2085 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M3",
2086 kde.ftie, sizeof(*ftie));
2087 ftie = (struct wpa_tdls_ftie *) kde.ftie;
2088
2089 if (kde.rsn_ie == NULL) {
2090 wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M3");
2091 return -1;
2092 }
2093 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M3",
2094 kde.rsn_ie, kde.rsn_ie_len);
2095 if (kde.rsn_ie_len != peer->rsnie_p_len ||
2096 os_memcmp(kde.rsn_ie, peer->rsnie_p, peer->rsnie_p_len) != 0) {
2097 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M3 does not match "
2098 "with the one sent in TPK M2");
2099 return -1;
2100 }
2101
2102 if (!os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) {
2103 wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does "
2104 "not match with FTIE ANonce used in TPK M2");
2105 return -1;
2106 }
2107
2108 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
2109 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M3 does not "
2110 "match with FTIE SNonce used in TPK M1");
2111 return -1;
2112 }
2113
2114 if (kde.key_lifetime == NULL) {
2115 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M3");
2116 return -1;
2117 }
2118 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
2119 wpa_hexdump(MSG_DEBUG, "TDLS: Timeout IE Received from TPK M3",
2120 (u8 *) timeoutie, sizeof(*timeoutie));
2121 lifetime = WPA_GET_LE32(timeoutie->value);
2122 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M3",
2123 lifetime);
2124 if (lifetime != peer->lifetime) {
2125 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
2126 "TPK M3 (expected %u)", lifetime, peer->lifetime);
2127 if (sm->tdls_external_setup)
2128 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
2129 return -1;
2130 }
2131
2132 if (wpa_supplicant_verify_tdls_mic(3, peer, (u8 *) lnkid,
2133 (u8 *) timeoutie, ftie) < 0) {
2134 wpa_tdls_del_key(sm, peer);
2135 wpa_tdls_peer_free(sm, peer);
2136 return -1;
2137 }
2138
2139 if (wpa_tdls_set_key(sm, peer) < 0)
2140 return -1;
2141
2142 skip_rsn:
2143 wpa_tdls_enable_link(sm, peer);
2144
2145 return 0;
2146 }
2147
2148
wpa_add_tdls_timeoutie(u8 * pos,u8 * ie,size_t ie_len,u32 tsecs)2149 static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs)
2150 {
2151 struct wpa_tdls_timeoutie *lifetime = (struct wpa_tdls_timeoutie *) ie;
2152
2153 os_memset(lifetime, 0, ie_len);
2154 lifetime->ie_type = WLAN_EID_TIMEOUT_INTERVAL;
2155 lifetime->ie_len = sizeof(struct wpa_tdls_timeoutie) - 2;
2156 lifetime->interval_type = WLAN_TIMEOUT_KEY_LIFETIME;
2157 WPA_PUT_LE32(lifetime->value, tsecs);
2158 os_memcpy(pos, ie, ie_len);
2159 return pos + ie_len;
2160 }
2161
2162
2163 /**
2164 * wpa_tdls_start - Initiate TDLS handshake (send TPK Handshake Message 1)
2165 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2166 * @peer: MAC address of the peer STA
2167 * Returns: 0 on success, or -1 on failure
2168 *
2169 * Send TPK Handshake Message 1 info to driver to start TDLS
2170 * handshake with the peer.
2171 */
wpa_tdls_start(struct wpa_sm * sm,const u8 * addr)2172 int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr)
2173 {
2174 struct wpa_tdls_peer *peer;
2175 int tdls_prohibited = sm->tdls_prohibited;
2176
2177 if (sm->tdls_disabled || !sm->tdls_supported)
2178 return -1;
2179
2180 #ifdef CONFIG_TDLS_TESTING
2181 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
2182 tdls_prohibited) {
2183 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
2184 "on TDLS");
2185 tdls_prohibited = 0;
2186 }
2187 #endif /* CONFIG_TDLS_TESTING */
2188
2189 if (tdls_prohibited) {
2190 wpa_printf(MSG_DEBUG, "TDLS: TDLS is prohibited in this BSS - "
2191 "reject request to start setup");
2192 return -1;
2193 }
2194
2195 peer = wpa_tdls_add_peer(sm, addr, NULL);
2196 if (peer == NULL)
2197 return -1;
2198
2199 peer->initiator = 1;
2200
2201 /* add the peer to the driver as a "setup in progress" peer */
2202 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, NULL, 0, NULL, NULL, 0,
2203 NULL, 0);
2204
2205 if (wpa_tdls_send_tpk_m1(sm, peer) < 0) {
2206 wpa_tdls_disable_link(sm, peer->addr);
2207 return -1;
2208 }
2209
2210 return 0;
2211 }
2212
2213
wpa_tdls_remove(struct wpa_sm * sm,const u8 * addr)2214 void wpa_tdls_remove(struct wpa_sm *sm, const u8 *addr)
2215 {
2216 struct wpa_tdls_peer *peer;
2217
2218 if (sm->tdls_disabled || !sm->tdls_supported)
2219 return;
2220
2221 for (peer = sm->tdls; peer; peer = peer->next) {
2222 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
2223 break;
2224 }
2225
2226 if (peer == NULL || !peer->tpk_success)
2227 return;
2228
2229 if (sm->tdls_external_setup) {
2230 /*
2231 * Disable previous link to allow renegotiation to be completed
2232 * on AP path.
2233 */
2234 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2235 }
2236 }
2237
2238
2239 /**
2240 * wpa_supplicant_rx_tdls - Receive TDLS data frame
2241 *
2242 * This function is called to receive TDLS (ethertype = 0x890d) data frames.
2243 */
wpa_supplicant_rx_tdls(void * ctx,const u8 * src_addr,const u8 * buf,size_t len)2244 static void wpa_supplicant_rx_tdls(void *ctx, const u8 *src_addr,
2245 const u8 *buf, size_t len)
2246 {
2247 struct wpa_sm *sm = ctx;
2248 struct wpa_tdls_frame *tf;
2249
2250 wpa_hexdump(MSG_DEBUG, "TDLS: Received Data frame encapsulation",
2251 buf, len);
2252
2253 if (sm->tdls_disabled || !sm->tdls_supported) {
2254 wpa_printf(MSG_DEBUG, "TDLS: Discard message - TDLS disabled "
2255 "or unsupported by driver");
2256 return;
2257 }
2258
2259 if (os_memcmp(src_addr, sm->own_addr, ETH_ALEN) == 0) {
2260 wpa_printf(MSG_DEBUG, "TDLS: Discard copy of own message");
2261 return;
2262 }
2263
2264 if (len < sizeof(*tf)) {
2265 wpa_printf(MSG_INFO, "TDLS: Drop too short frame");
2266 return;
2267 }
2268
2269 /* Check to make sure its a valid encapsulated TDLS frame */
2270 tf = (struct wpa_tdls_frame *) buf;
2271 if (tf->payloadtype != 2 /* TDLS_RFTYPE */ ||
2272 tf->category != WLAN_ACTION_TDLS) {
2273 wpa_printf(MSG_INFO, "TDLS: Invalid frame - payloadtype=%u "
2274 "category=%u action=%u",
2275 tf->payloadtype, tf->category, tf->action);
2276 return;
2277 }
2278
2279 switch (tf->action) {
2280 case WLAN_TDLS_SETUP_REQUEST:
2281 wpa_tdls_process_tpk_m1(sm, src_addr, buf, len);
2282 break;
2283 case WLAN_TDLS_SETUP_RESPONSE:
2284 wpa_tdls_process_tpk_m2(sm, src_addr, buf, len);
2285 break;
2286 case WLAN_TDLS_SETUP_CONFIRM:
2287 wpa_tdls_process_tpk_m3(sm, src_addr, buf, len);
2288 break;
2289 case WLAN_TDLS_TEARDOWN:
2290 wpa_tdls_recv_teardown(sm, src_addr, buf, len);
2291 break;
2292 case WLAN_TDLS_DISCOVERY_REQUEST:
2293 wpa_tdls_process_discovery_request(sm, src_addr, buf, len);
2294 break;
2295 default:
2296 /* Kernel code will process remaining frames */
2297 wpa_printf(MSG_DEBUG, "TDLS: Ignore TDLS frame action code %u",
2298 tf->action);
2299 break;
2300 }
2301 }
2302
2303
2304 /**
2305 * wpa_tdls_init - Initialize driver interface parameters for TDLS
2306 * @wpa_s: Pointer to wpa_supplicant data
2307 * Returns: 0 on success, -1 on failure
2308 *
2309 * This function is called to initialize driver interface parameters for TDLS.
2310 * wpa_drv_init() must have been called before this function to initialize the
2311 * driver interface.
2312 */
wpa_tdls_init(struct wpa_sm * sm)2313 int wpa_tdls_init(struct wpa_sm *sm)
2314 {
2315 if (sm == NULL)
2316 return -1;
2317
2318 sm->l2_tdls = l2_packet_init(sm->bridge_ifname ? sm->bridge_ifname :
2319 sm->ifname,
2320 sm->own_addr,
2321 ETH_P_80211_ENCAP, wpa_supplicant_rx_tdls,
2322 sm, 0);
2323 if (sm->l2_tdls == NULL) {
2324 wpa_printf(MSG_ERROR, "TDLS: Failed to open l2_packet "
2325 "connection");
2326 return -1;
2327 }
2328
2329 /*
2330 * Drivers that support TDLS but don't implement the get_capa callback
2331 * are assumed to perform everything internally
2332 */
2333 if (wpa_sm_tdls_get_capa(sm, &sm->tdls_supported,
2334 &sm->tdls_external_setup) < 0) {
2335 sm->tdls_supported = 1;
2336 sm->tdls_external_setup = 0;
2337 }
2338
2339 wpa_printf(MSG_DEBUG, "TDLS: TDLS operation%s supported by "
2340 "driver", sm->tdls_supported ? "" : " not");
2341 wpa_printf(MSG_DEBUG, "TDLS: Driver uses %s link setup",
2342 sm->tdls_external_setup ? "external" : "internal");
2343
2344 return 0;
2345 }
2346
2347
wpa_tdls_teardown_peers(struct wpa_sm * sm)2348 void wpa_tdls_teardown_peers(struct wpa_sm *sm)
2349 {
2350 struct wpa_tdls_peer *peer;
2351
2352 peer = sm->tdls;
2353
2354 wpa_printf(MSG_DEBUG, "TDLS: Tear down peers");
2355
2356 while (peer) {
2357 wpa_printf(MSG_DEBUG, "TDLS: Tear down peer " MACSTR,
2358 MAC2STR(peer->addr));
2359 if (sm->tdls_external_setup)
2360 wpa_tdls_send_teardown(sm, peer->addr,
2361 WLAN_REASON_DEAUTH_LEAVING);
2362 else
2363 wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr);
2364
2365 peer = peer->next;
2366 }
2367 }
2368
2369
wpa_tdls_remove_peers(struct wpa_sm * sm)2370 static void wpa_tdls_remove_peers(struct wpa_sm *sm)
2371 {
2372 struct wpa_tdls_peer *peer, *tmp;
2373
2374 peer = sm->tdls;
2375 sm->tdls = NULL;
2376
2377 while (peer) {
2378 int res;
2379 tmp = peer->next;
2380 res = wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2381 wpa_printf(MSG_DEBUG, "TDLS: Remove peer " MACSTR " (res=%d)",
2382 MAC2STR(peer->addr), res);
2383 wpa_tdls_peer_free(sm, peer);
2384 os_free(peer);
2385 peer = tmp;
2386 }
2387 }
2388
2389
2390 /**
2391 * wpa_tdls_deinit - Deinitialize driver interface parameters for TDLS
2392 *
2393 * This function is called to recover driver interface parameters for TDLS
2394 * and frees resources allocated for it.
2395 */
wpa_tdls_deinit(struct wpa_sm * sm)2396 void wpa_tdls_deinit(struct wpa_sm *sm)
2397 {
2398 if (sm == NULL)
2399 return;
2400
2401 if (sm->l2_tdls)
2402 l2_packet_deinit(sm->l2_tdls);
2403 sm->l2_tdls = NULL;
2404
2405 wpa_tdls_remove_peers(sm);
2406 }
2407
2408
wpa_tdls_assoc(struct wpa_sm * sm)2409 void wpa_tdls_assoc(struct wpa_sm *sm)
2410 {
2411 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on association");
2412 wpa_tdls_remove_peers(sm);
2413 }
2414
2415
wpa_tdls_disassoc(struct wpa_sm * sm)2416 void wpa_tdls_disassoc(struct wpa_sm *sm)
2417 {
2418 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on disassociation");
2419 wpa_tdls_remove_peers(sm);
2420 }
2421
2422
wpa_tdls_prohibited(const u8 * ies,size_t len)2423 static int wpa_tdls_prohibited(const u8 *ies, size_t len)
2424 {
2425 struct wpa_eapol_ie_parse elems;
2426
2427 if (ies == NULL)
2428 return 0;
2429
2430 if (wpa_supplicant_parse_ies(ies, len, &elems) < 0)
2431 return 0;
2432
2433 if (elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5)
2434 return 0;
2435
2436 /* bit 38 - TDLS Prohibited */
2437 return !!(elems.ext_capab[2 + 4] & 0x40);
2438 }
2439
2440
wpa_tdls_ap_ies(struct wpa_sm * sm,const u8 * ies,size_t len)2441 void wpa_tdls_ap_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2442 {
2443 sm->tdls_prohibited = wpa_tdls_prohibited(ies, len);
2444 wpa_printf(MSG_DEBUG, "TDLS: TDLS is %s in the target BSS",
2445 sm->tdls_prohibited ? "prohibited" : "allowed");
2446 }
2447
2448
wpa_tdls_assoc_resp_ies(struct wpa_sm * sm,const u8 * ies,size_t len)2449 void wpa_tdls_assoc_resp_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2450 {
2451 if (!sm->tdls_prohibited && wpa_tdls_prohibited(ies, len)) {
2452 wpa_printf(MSG_DEBUG, "TDLS: TDLS prohibited based on "
2453 "(Re)Association Response IEs");
2454 sm->tdls_prohibited = 1;
2455 }
2456 }
2457
2458
wpa_tdls_enable(struct wpa_sm * sm,int enabled)2459 void wpa_tdls_enable(struct wpa_sm *sm, int enabled)
2460 {
2461 wpa_printf(MSG_DEBUG, "TDLS: %s", enabled ? "enabled" : "disabled");
2462 sm->tdls_disabled = !enabled;
2463 }
2464
2465
wpa_tdls_is_external_setup(struct wpa_sm * sm)2466 int wpa_tdls_is_external_setup(struct wpa_sm *sm)
2467 {
2468 return sm->tdls_external_setup;
2469 }
2470