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 "common/ieee802_11_common.h"
16 #include "crypto/sha256.h"
17 #include "crypto/crypto.h"
18 #include "crypto/aes_wrap.h"
19 #include "rsn_supp/wpa.h"
20 #include "rsn_supp/wpa_ie.h"
21 #include "rsn_supp/wpa_i.h"
22 #include "drivers/driver.h"
23 #include "l2_packet/l2_packet.h"
24
25 #ifdef CONFIG_TDLS_TESTING
26 #define TDLS_TESTING_LONG_FRAME BIT(0)
27 #define TDLS_TESTING_ALT_RSN_IE BIT(1)
28 #define TDLS_TESTING_DIFF_BSSID BIT(2)
29 #define TDLS_TESTING_SHORT_LIFETIME BIT(3)
30 #define TDLS_TESTING_WRONG_LIFETIME_RESP BIT(4)
31 #define TDLS_TESTING_WRONG_LIFETIME_CONF BIT(5)
32 #define TDLS_TESTING_LONG_LIFETIME BIT(6)
33 #define TDLS_TESTING_CONCURRENT_INIT BIT(7)
34 #define TDLS_TESTING_NO_TPK_EXPIRATION BIT(8)
35 #define TDLS_TESTING_DECLINE_RESP BIT(9)
36 #define TDLS_TESTING_IGNORE_AP_PROHIBIT BIT(10)
37 #define TDLS_TESTING_WRONG_MIC BIT(11)
38 unsigned int tdls_testing = 0;
39 #endif /* CONFIG_TDLS_TESTING */
40
41 #define TPK_LIFETIME 43200 /* 12 hours */
42 #define TPK_M1_RETRY_COUNT 3
43 #define TPK_M1_TIMEOUT 5000 /* in milliseconds */
44 #define TPK_M2_RETRY_COUNT 10
45 #define TPK_M2_TIMEOUT 500 /* in milliseconds */
46
47 #define TDLS_MIC_LEN 16
48
49 #define TDLS_TIMEOUT_LEN 4
50
51 struct wpa_tdls_ftie {
52 u8 ie_type; /* FTIE */
53 u8 ie_len;
54 u8 mic_ctrl[2];
55 u8 mic[TDLS_MIC_LEN];
56 u8 Anonce[WPA_NONCE_LEN]; /* Responder Nonce in TDLS */
57 u8 Snonce[WPA_NONCE_LEN]; /* Initiator Nonce in TDLS */
58 /* followed by optional elements */
59 } STRUCT_PACKED;
60
61 struct wpa_tdls_timeoutie {
62 u8 ie_type; /* Timeout IE */
63 u8 ie_len;
64 u8 interval_type;
65 u8 value[TDLS_TIMEOUT_LEN];
66 } STRUCT_PACKED;
67
68 struct wpa_tdls_lnkid {
69 u8 ie_type; /* Link Identifier IE */
70 u8 ie_len;
71 u8 bssid[ETH_ALEN];
72 u8 init_sta[ETH_ALEN];
73 u8 resp_sta[ETH_ALEN];
74 } STRUCT_PACKED;
75
76 /* TDLS frame headers as per IEEE Std 802.11z-2010 */
77 struct wpa_tdls_frame {
78 u8 payloadtype; /* IEEE80211_TDLS_RFTYPE */
79 u8 category; /* Category */
80 u8 action; /* Action (enum tdls_frame_type) */
81 } STRUCT_PACKED;
82
83 static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs);
84 static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx);
85 static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer);
86 static void wpa_tdls_disable_peer_link(struct wpa_sm *sm,
87 struct wpa_tdls_peer *peer);
88 static int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr,
89 u16 reason_code);
90
91
92 #define TDLS_MAX_IE_LEN 80
93 #define IEEE80211_MAX_SUPP_RATES 32
94
95 struct wpa_tdls_peer {
96 struct wpa_tdls_peer *next;
97 unsigned int reconfig_key:1;
98 int initiator; /* whether this end was initiator for TDLS setup */
99 u8 addr[ETH_ALEN]; /* other end MAC address */
100 u8 inonce[WPA_NONCE_LEN]; /* Initiator Nonce */
101 u8 rnonce[WPA_NONCE_LEN]; /* Responder Nonce */
102 u8 rsnie_i[TDLS_MAX_IE_LEN]; /* Initiator RSN IE */
103 size_t rsnie_i_len;
104 u8 rsnie_p[TDLS_MAX_IE_LEN]; /* Peer RSN IE */
105 size_t rsnie_p_len;
106 u32 lifetime;
107 int cipher; /* Selected cipher (WPA_CIPHER_*) */
108 u8 dtoken;
109
110 struct tpk {
111 u8 kck[16]; /* TPK-KCK */
112 u8 tk[16]; /* TPK-TK; assuming only CCMP will be used */
113 } tpk;
114 int tpk_set;
115 int tpk_success;
116 int tpk_in_progress;
117
118 struct tpk_timer {
119 u8 dest[ETH_ALEN];
120 int count; /* Retry Count */
121 int timer; /* Timeout in milliseconds */
122 u8 action_code; /* TDLS frame type */
123 u8 dialog_token;
124 u16 status_code;
125 u32 peer_capab;
126 int buf_len; /* length of TPK message for retransmission */
127 u8 *buf; /* buffer for TPK message */
128 } sm_tmr;
129
130 u16 capability;
131
132 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
133 size_t supp_rates_len;
134
135 struct ieee80211_ht_capabilities *ht_capabilities;
136 struct ieee80211_vht_capabilities *vht_capabilities;
137
138 u8 qos_info;
139
140 u16 aid;
141
142 u8 *ext_capab;
143 size_t ext_capab_len;
144
145 u8 *supp_channels;
146 size_t supp_channels_len;
147
148 u8 *supp_oper_classes;
149 size_t supp_oper_classes_len;
150
151 u8 wmm_capable;
152
153 /* channel switch currently enabled */
154 int chan_switch_enabled;
155 };
156
157
wpa_tdls_get_privacy(struct wpa_sm * sm)158 static int wpa_tdls_get_privacy(struct wpa_sm *sm)
159 {
160 /*
161 * Get info needed from supplicant to check if the current BSS supports
162 * security. Other than OPEN mode, rest are considered secured
163 * WEP/WPA/WPA2 hence TDLS frames are processed for TPK handshake.
164 */
165 return sm->pairwise_cipher != WPA_CIPHER_NONE;
166 }
167
168
wpa_add_ie(u8 * pos,const u8 * ie,size_t ie_len)169 static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len)
170 {
171 os_memcpy(pos, ie, ie_len);
172 return pos + ie_len;
173 }
174
175
wpa_tdls_del_key(struct wpa_sm * sm,struct wpa_tdls_peer * peer)176 static int wpa_tdls_del_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
177 {
178 if (wpa_sm_set_key(sm, WPA_ALG_NONE, peer->addr,
179 0, 0, NULL, 0, NULL, 0) < 0) {
180 wpa_printf(MSG_WARNING, "TDLS: Failed to delete TPK-TK from "
181 "the driver");
182 return -1;
183 }
184
185 return 0;
186 }
187
188
wpa_tdls_set_key(struct wpa_sm * sm,struct wpa_tdls_peer * peer)189 static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
190 {
191 u8 key_len;
192 u8 rsc[6];
193 enum wpa_alg alg;
194
195 os_memset(rsc, 0, 6);
196
197 switch (peer->cipher) {
198 case WPA_CIPHER_CCMP:
199 alg = WPA_ALG_CCMP;
200 key_len = 16;
201 break;
202 case WPA_CIPHER_NONE:
203 wpa_printf(MSG_DEBUG, "TDLS: Pairwise Cipher Suite: "
204 "NONE - do not use pairwise keys");
205 return -1;
206 default:
207 wpa_printf(MSG_WARNING, "TDLS: Unsupported pairwise cipher %d",
208 sm->pairwise_cipher);
209 return -1;
210 }
211
212 if (wpa_sm_set_key(sm, alg, peer->addr, -1, 1,
213 rsc, sizeof(rsc), peer->tpk.tk, key_len) < 0) {
214 wpa_printf(MSG_WARNING, "TDLS: Failed to set TPK to the "
215 "driver");
216 return -1;
217 }
218 return 0;
219 }
220
221
wpa_tdls_send_tpk_msg(struct wpa_sm * sm,const u8 * dst,u8 action_code,u8 dialog_token,u16 status_code,u32 peer_capab,int initiator,const u8 * buf,size_t len)222 static int wpa_tdls_send_tpk_msg(struct wpa_sm *sm, const u8 *dst,
223 u8 action_code, u8 dialog_token,
224 u16 status_code, u32 peer_capab,
225 int initiator, const u8 *buf, size_t len)
226 {
227 return wpa_sm_send_tdls_mgmt(sm, dst, action_code, dialog_token,
228 status_code, peer_capab, initiator, buf,
229 len);
230 }
231
232
wpa_tdls_tpk_send(struct wpa_sm * sm,const u8 * dest,u8 action_code,u8 dialog_token,u16 status_code,u32 peer_capab,int initiator,const u8 * msg,size_t msg_len)233 static int wpa_tdls_tpk_send(struct wpa_sm *sm, const u8 *dest, u8 action_code,
234 u8 dialog_token, u16 status_code, u32 peer_capab,
235 int initiator, const u8 *msg, size_t msg_len)
236 {
237 struct wpa_tdls_peer *peer;
238
239 wpa_printf(MSG_DEBUG, "TDLS: TPK send dest=" MACSTR " action_code=%u "
240 "dialog_token=%u status_code=%u peer_capab=%u initiator=%d "
241 "msg_len=%u",
242 MAC2STR(dest), action_code, dialog_token, status_code,
243 peer_capab, initiator, (unsigned int) msg_len);
244
245 if (wpa_tdls_send_tpk_msg(sm, dest, action_code, dialog_token,
246 status_code, peer_capab, initiator, msg,
247 msg_len)) {
248 wpa_printf(MSG_INFO, "TDLS: Failed to send message "
249 "(action_code=%u)", action_code);
250 return -1;
251 }
252
253 if (action_code == WLAN_TDLS_SETUP_CONFIRM ||
254 action_code == WLAN_TDLS_TEARDOWN ||
255 action_code == WLAN_TDLS_DISCOVERY_REQUEST ||
256 action_code == WLAN_TDLS_DISCOVERY_RESPONSE)
257 return 0; /* No retries */
258
259 for (peer = sm->tdls; peer; peer = peer->next) {
260 if (os_memcmp(peer->addr, dest, ETH_ALEN) == 0)
261 break;
262 }
263
264 if (peer == NULL) {
265 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
266 "retry " MACSTR, MAC2STR(dest));
267 return 0;
268 }
269
270 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
271
272 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
273 peer->sm_tmr.count = TPK_M2_RETRY_COUNT;
274 peer->sm_tmr.timer = TPK_M2_TIMEOUT;
275 } else {
276 peer->sm_tmr.count = TPK_M1_RETRY_COUNT;
277 peer->sm_tmr.timer = TPK_M1_TIMEOUT;
278 }
279
280 /* Copy message to resend on timeout */
281 os_memcpy(peer->sm_tmr.dest, dest, ETH_ALEN);
282 peer->sm_tmr.action_code = action_code;
283 peer->sm_tmr.dialog_token = dialog_token;
284 peer->sm_tmr.status_code = status_code;
285 peer->sm_tmr.peer_capab = peer_capab;
286 peer->sm_tmr.buf_len = msg_len;
287 os_free(peer->sm_tmr.buf);
288 peer->sm_tmr.buf = os_malloc(msg_len);
289 if (peer->sm_tmr.buf == NULL)
290 return -1;
291 os_memcpy(peer->sm_tmr.buf, msg, msg_len);
292
293 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout registered "
294 "(action_code=%u)", action_code);
295 eloop_register_timeout(peer->sm_tmr.timer / 1000,
296 (peer->sm_tmr.timer % 1000) * 1000,
297 wpa_tdls_tpk_retry_timeout, sm, peer);
298 return 0;
299 }
300
301
wpa_tdls_do_teardown(struct wpa_sm * sm,struct wpa_tdls_peer * peer,u16 reason_code)302 static int wpa_tdls_do_teardown(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
303 u16 reason_code)
304 {
305 int ret;
306
307 ret = wpa_tdls_send_teardown(sm, peer->addr, reason_code);
308 /* disable the link after teardown was sent */
309 wpa_tdls_disable_peer_link(sm, peer);
310
311 return ret;
312 }
313
314
wpa_tdls_tpk_retry_timeout(void * eloop_ctx,void * timeout_ctx)315 static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx)
316 {
317
318 struct wpa_sm *sm = eloop_ctx;
319 struct wpa_tdls_peer *peer = timeout_ctx;
320
321 if (peer->sm_tmr.count) {
322 peer->sm_tmr.count--;
323
324 wpa_printf(MSG_INFO, "TDLS: Retrying sending of message "
325 "(action_code=%u)",
326 peer->sm_tmr.action_code);
327
328 if (peer->sm_tmr.buf == NULL) {
329 wpa_printf(MSG_INFO, "TDLS: No retry buffer available "
330 "for action_code=%u",
331 peer->sm_tmr.action_code);
332 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm,
333 peer);
334 return;
335 }
336
337 /* resend TPK Handshake Message to Peer */
338 if (wpa_tdls_send_tpk_msg(sm, peer->sm_tmr.dest,
339 peer->sm_tmr.action_code,
340 peer->sm_tmr.dialog_token,
341 peer->sm_tmr.status_code,
342 peer->sm_tmr.peer_capab,
343 peer->initiator,
344 peer->sm_tmr.buf,
345 peer->sm_tmr.buf_len)) {
346 wpa_printf(MSG_INFO, "TDLS: Failed to retry "
347 "transmission");
348 }
349
350 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
351 eloop_register_timeout(peer->sm_tmr.timer / 1000,
352 (peer->sm_tmr.timer % 1000) * 1000,
353 wpa_tdls_tpk_retry_timeout, sm, peer);
354 } else {
355 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
356
357 wpa_printf(MSG_DEBUG, "TDLS: Sending Teardown Request");
358 wpa_tdls_do_teardown(sm, peer,
359 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
360 }
361 }
362
363
wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm * sm,struct wpa_tdls_peer * peer,u8 action_code)364 static void wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm *sm,
365 struct wpa_tdls_peer *peer,
366 u8 action_code)
367 {
368 if (action_code == peer->sm_tmr.action_code) {
369 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout cancelled for "
370 "action_code=%u", action_code);
371
372 /* Cancel Timeout registered */
373 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
374
375 /* free all resources meant for retry */
376 os_free(peer->sm_tmr.buf);
377 peer->sm_tmr.buf = NULL;
378
379 peer->sm_tmr.count = 0;
380 peer->sm_tmr.timer = 0;
381 peer->sm_tmr.buf_len = 0;
382 peer->sm_tmr.action_code = 0xff;
383 } else {
384 wpa_printf(MSG_INFO, "TDLS: Error in cancelling retry timeout "
385 "(Unknown action_code=%u)", action_code);
386 }
387 }
388
389
wpa_tdls_generate_tpk(struct wpa_tdls_peer * peer,const u8 * own_addr,const u8 * bssid)390 static void wpa_tdls_generate_tpk(struct wpa_tdls_peer *peer,
391 const u8 *own_addr, const u8 *bssid)
392 {
393 u8 key_input[SHA256_MAC_LEN];
394 const u8 *nonce[2];
395 size_t len[2];
396 u8 data[3 * ETH_ALEN];
397
398 /* IEEE Std 802.11z-2010 8.5.9.1:
399 * TPK-Key-Input = SHA-256(min(SNonce, ANonce) || max(SNonce, ANonce))
400 */
401 len[0] = WPA_NONCE_LEN;
402 len[1] = WPA_NONCE_LEN;
403 if (os_memcmp(peer->inonce, peer->rnonce, WPA_NONCE_LEN) < 0) {
404 nonce[0] = peer->inonce;
405 nonce[1] = peer->rnonce;
406 } else {
407 nonce[0] = peer->rnonce;
408 nonce[1] = peer->inonce;
409 }
410 wpa_hexdump(MSG_DEBUG, "TDLS: min(Nonce)", nonce[0], WPA_NONCE_LEN);
411 wpa_hexdump(MSG_DEBUG, "TDLS: max(Nonce)", nonce[1], WPA_NONCE_LEN);
412 sha256_vector(2, nonce, len, key_input);
413 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-Key-Input",
414 key_input, SHA256_MAC_LEN);
415
416 /*
417 * TPK-Key-Data = KDF-N_KEY(TPK-Key-Input, "TDLS PMK",
418 * min(MAC_I, MAC_R) || max(MAC_I, MAC_R) || BSSID || N_KEY)
419 * TODO: is N_KEY really included in KDF Context and if so, in which
420 * presentation format (little endian 16-bit?) is it used? It gets
421 * added by the KDF anyway..
422 */
423
424 if (os_memcmp(own_addr, peer->addr, ETH_ALEN) < 0) {
425 os_memcpy(data, own_addr, ETH_ALEN);
426 os_memcpy(data + ETH_ALEN, peer->addr, ETH_ALEN);
427 } else {
428 os_memcpy(data, peer->addr, ETH_ALEN);
429 os_memcpy(data + ETH_ALEN, own_addr, ETH_ALEN);
430 }
431 os_memcpy(data + 2 * ETH_ALEN, bssid, ETH_ALEN);
432 wpa_hexdump(MSG_DEBUG, "TDLS: KDF Context", data, sizeof(data));
433
434 sha256_prf(key_input, SHA256_MAC_LEN, "TDLS PMK", data, sizeof(data),
435 (u8 *) &peer->tpk, sizeof(peer->tpk));
436 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-KCK",
437 peer->tpk.kck, sizeof(peer->tpk.kck));
438 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-TK",
439 peer->tpk.tk, sizeof(peer->tpk.tk));
440 peer->tpk_set = 1;
441 }
442
443
444 /**
445 * wpa_tdls_ftie_mic - Calculate TDLS FTIE MIC
446 * @kck: TPK-KCK
447 * @lnkid: Pointer to the beginning of Link Identifier IE
448 * @rsnie: Pointer to the beginning of RSN IE used for handshake
449 * @timeoutie: Pointer to the beginning of Timeout IE used for handshake
450 * @ftie: Pointer to the beginning of FT IE
451 * @mic: Pointer for writing MIC
452 *
453 * Calculate MIC for TDLS frame.
454 */
wpa_tdls_ftie_mic(const u8 * kck,u8 trans_seq,const u8 * lnkid,const u8 * rsnie,const u8 * timeoutie,const u8 * ftie,u8 * mic)455 static int wpa_tdls_ftie_mic(const u8 *kck, u8 trans_seq, const u8 *lnkid,
456 const u8 *rsnie, const u8 *timeoutie,
457 const u8 *ftie, u8 *mic)
458 {
459 u8 *buf, *pos;
460 struct wpa_tdls_ftie *_ftie;
461 const struct wpa_tdls_lnkid *_lnkid;
462 int ret;
463 int len = 2 * ETH_ALEN + 1 + 2 + lnkid[1] + 2 + rsnie[1] +
464 2 + timeoutie[1] + 2 + ftie[1];
465 buf = os_zalloc(len);
466 if (!buf) {
467 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
468 return -1;
469 }
470
471 pos = buf;
472 _lnkid = (const struct wpa_tdls_lnkid *) lnkid;
473 /* 1) TDLS initiator STA MAC address */
474 os_memcpy(pos, _lnkid->init_sta, ETH_ALEN);
475 pos += ETH_ALEN;
476 /* 2) TDLS responder STA MAC address */
477 os_memcpy(pos, _lnkid->resp_sta, ETH_ALEN);
478 pos += ETH_ALEN;
479 /* 3) Transaction Sequence number */
480 *pos++ = trans_seq;
481 /* 4) Link Identifier IE */
482 os_memcpy(pos, lnkid, 2 + lnkid[1]);
483 pos += 2 + lnkid[1];
484 /* 5) RSN IE */
485 os_memcpy(pos, rsnie, 2 + rsnie[1]);
486 pos += 2 + rsnie[1];
487 /* 6) Timeout Interval IE */
488 os_memcpy(pos, timeoutie, 2 + timeoutie[1]);
489 pos += 2 + timeoutie[1];
490 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
491 os_memcpy(pos, ftie, 2 + ftie[1]);
492 _ftie = (struct wpa_tdls_ftie *) pos;
493 os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
494 pos += 2 + ftie[1];
495
496 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
497 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
498 ret = omac1_aes_128(kck, buf, pos - buf, mic);
499 os_free(buf);
500 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
501 return ret;
502 }
503
504
505 /**
506 * wpa_tdls_key_mic_teardown - Calculate TDLS FTIE MIC for Teardown frame
507 * @kck: TPK-KCK
508 * @trans_seq: Transaction Sequence Number (4 - Teardown)
509 * @rcode: Reason code for Teardown
510 * @dtoken: Dialog Token used for that particular link
511 * @lnkid: Pointer to the beginning of Link Identifier IE
512 * @ftie: Pointer to the beginning of FT IE
513 * @mic: Pointer for writing MIC
514 *
515 * Calculate MIC for TDLS frame.
516 */
wpa_tdls_key_mic_teardown(const u8 * kck,u8 trans_seq,u16 rcode,u8 dtoken,const u8 * lnkid,const u8 * ftie,u8 * mic)517 static int wpa_tdls_key_mic_teardown(const u8 *kck, u8 trans_seq, u16 rcode,
518 u8 dtoken, const u8 *lnkid,
519 const u8 *ftie, u8 *mic)
520 {
521 u8 *buf, *pos;
522 struct wpa_tdls_ftie *_ftie;
523 int ret;
524 int len;
525
526 if (lnkid == NULL)
527 return -1;
528
529 len = 2 + lnkid[1] + sizeof(rcode) + sizeof(dtoken) +
530 sizeof(trans_seq) + 2 + ftie[1];
531
532 buf = os_zalloc(len);
533 if (!buf) {
534 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
535 return -1;
536 }
537
538 pos = buf;
539 /* 1) Link Identifier IE */
540 os_memcpy(pos, lnkid, 2 + lnkid[1]);
541 pos += 2 + lnkid[1];
542 /* 2) Reason Code */
543 WPA_PUT_LE16(pos, rcode);
544 pos += sizeof(rcode);
545 /* 3) Dialog token */
546 *pos++ = dtoken;
547 /* 4) Transaction Sequence number */
548 *pos++ = trans_seq;
549 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
550 os_memcpy(pos, ftie, 2 + ftie[1]);
551 _ftie = (struct wpa_tdls_ftie *) pos;
552 os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
553 pos += 2 + ftie[1];
554
555 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
556 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
557 ret = omac1_aes_128(kck, buf, pos - buf, mic);
558 os_free(buf);
559 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
560 return ret;
561 }
562
563
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)564 static int wpa_supplicant_verify_tdls_mic(u8 trans_seq,
565 struct wpa_tdls_peer *peer,
566 const u8 *lnkid, const u8 *timeoutie,
567 const struct wpa_tdls_ftie *ftie)
568 {
569 u8 mic[16];
570
571 if (peer->tpk_set) {
572 wpa_tdls_ftie_mic(peer->tpk.kck, trans_seq, lnkid,
573 peer->rsnie_p, timeoutie, (u8 *) ftie,
574 mic);
575 if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
576 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in FTIE - "
577 "dropping packet");
578 wpa_hexdump(MSG_DEBUG, "TDLS: Received MIC",
579 ftie->mic, 16);
580 wpa_hexdump(MSG_DEBUG, "TDLS: Calculated MIC",
581 mic, 16);
582 return -1;
583 }
584 } else {
585 wpa_printf(MSG_WARNING, "TDLS: Could not verify TDLS MIC, "
586 "TPK not set - dropping packet");
587 return -1;
588 }
589 return 0;
590 }
591
592
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)593 static int wpa_supplicant_verify_tdls_mic_teardown(
594 u8 trans_seq, u16 rcode, u8 dtoken, struct wpa_tdls_peer *peer,
595 const u8 *lnkid, const struct wpa_tdls_ftie *ftie)
596 {
597 u8 mic[16];
598
599 if (peer->tpk_set) {
600 wpa_tdls_key_mic_teardown(peer->tpk.kck, trans_seq, rcode,
601 dtoken, lnkid, (u8 *) ftie, mic);
602 if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
603 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in Teardown - "
604 "dropping packet");
605 return -1;
606 }
607 } else {
608 wpa_printf(MSG_INFO, "TDLS: Could not verify TDLS Teardown "
609 "MIC, TPK not set - dropping packet");
610 return -1;
611 }
612 return 0;
613 }
614
615
wpa_tdls_tpk_timeout(void * eloop_ctx,void * timeout_ctx)616 static void wpa_tdls_tpk_timeout(void *eloop_ctx, void *timeout_ctx)
617 {
618 struct wpa_sm *sm = eloop_ctx;
619 struct wpa_tdls_peer *peer = timeout_ctx;
620
621 /*
622 * On TPK lifetime expiration, we have an option of either tearing down
623 * the direct link or trying to re-initiate it. The selection of what
624 * to do is not strictly speaking controlled by our role in the expired
625 * link, but for now, use that to select whether to renew or tear down
626 * the link.
627 */
628
629 if (peer->initiator) {
630 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
631 " - try to renew", MAC2STR(peer->addr));
632 wpa_tdls_start(sm, peer->addr);
633 } else {
634 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
635 " - tear down", MAC2STR(peer->addr));
636 wpa_tdls_do_teardown(sm, peer,
637 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
638 }
639 }
640
641
wpa_tdls_peer_remove_from_list(struct wpa_sm * sm,struct wpa_tdls_peer * peer)642 static void wpa_tdls_peer_remove_from_list(struct wpa_sm *sm,
643 struct wpa_tdls_peer *peer)
644 {
645 struct wpa_tdls_peer *cur, *prev;
646
647 cur = sm->tdls;
648 prev = NULL;
649 while (cur && cur != peer) {
650 prev = cur;
651 cur = cur->next;
652 }
653
654 if (cur != peer) {
655 wpa_printf(MSG_ERROR, "TDLS: Could not find peer " MACSTR
656 " to remove it from the list",
657 MAC2STR(peer->addr));
658 return;
659 }
660
661 if (prev)
662 prev->next = peer->next;
663 else
664 sm->tdls = peer->next;
665 }
666
667
wpa_tdls_peer_clear(struct wpa_sm * sm,struct wpa_tdls_peer * peer)668 static void wpa_tdls_peer_clear(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
669 {
670 wpa_printf(MSG_DEBUG, "TDLS: Clear state for peer " MACSTR,
671 MAC2STR(peer->addr));
672 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
673 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
674 peer->reconfig_key = 0;
675 peer->initiator = 0;
676 peer->tpk_in_progress = 0;
677 os_free(peer->sm_tmr.buf);
678 peer->sm_tmr.buf = NULL;
679 os_free(peer->ht_capabilities);
680 peer->ht_capabilities = NULL;
681 os_free(peer->vht_capabilities);
682 peer->vht_capabilities = NULL;
683 os_free(peer->ext_capab);
684 peer->ext_capab = NULL;
685 os_free(peer->supp_channels);
686 peer->supp_channels = NULL;
687 os_free(peer->supp_oper_classes);
688 peer->supp_oper_classes = NULL;
689 peer->rsnie_i_len = peer->rsnie_p_len = 0;
690 peer->cipher = 0;
691 peer->qos_info = 0;
692 peer->wmm_capable = 0;
693 peer->tpk_set = peer->tpk_success = 0;
694 peer->chan_switch_enabled = 0;
695 os_memset(&peer->tpk, 0, sizeof(peer->tpk));
696 os_memset(peer->inonce, 0, WPA_NONCE_LEN);
697 os_memset(peer->rnonce, 0, WPA_NONCE_LEN);
698 }
699
700
wpa_tdls_peer_free(struct wpa_sm * sm,struct wpa_tdls_peer * peer)701 static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
702 {
703 wpa_tdls_peer_clear(sm, peer);
704 wpa_tdls_peer_remove_from_list(sm, peer);
705 os_free(peer);
706 }
707
708
wpa_tdls_linkid(struct wpa_sm * sm,struct wpa_tdls_peer * peer,struct wpa_tdls_lnkid * lnkid)709 static void wpa_tdls_linkid(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
710 struct wpa_tdls_lnkid *lnkid)
711 {
712 lnkid->ie_type = WLAN_EID_LINK_ID;
713 lnkid->ie_len = 3 * ETH_ALEN;
714 os_memcpy(lnkid->bssid, sm->bssid, ETH_ALEN);
715 if (peer->initiator) {
716 os_memcpy(lnkid->init_sta, sm->own_addr, ETH_ALEN);
717 os_memcpy(lnkid->resp_sta, peer->addr, ETH_ALEN);
718 } else {
719 os_memcpy(lnkid->init_sta, peer->addr, ETH_ALEN);
720 os_memcpy(lnkid->resp_sta, sm->own_addr, ETH_ALEN);
721 }
722 }
723
724
wpa_tdls_send_teardown(struct wpa_sm * sm,const u8 * addr,u16 reason_code)725 static int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr,
726 u16 reason_code)
727 {
728 struct wpa_tdls_peer *peer;
729 struct wpa_tdls_ftie *ftie;
730 struct wpa_tdls_lnkid lnkid;
731 u8 dialog_token;
732 u8 *rbuf, *pos;
733 int ielen;
734
735 if (sm->tdls_disabled || !sm->tdls_supported)
736 return -1;
737
738 /* Find the node and free from the list */
739 for (peer = sm->tdls; peer; peer = peer->next) {
740 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
741 break;
742 }
743
744 if (peer == NULL) {
745 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
746 "Teardown " MACSTR, MAC2STR(addr));
747 return 0;
748 }
749
750 /* Cancel active channel switch before teardown */
751 if (peer->chan_switch_enabled) {
752 wpa_printf(MSG_DEBUG, "TDLS: First returning link with " MACSTR
753 " to base channel", MAC2STR(addr));
754 wpa_sm_tdls_disable_channel_switch(sm, peer->addr);
755 }
756
757 dialog_token = peer->dtoken;
758
759 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown for " MACSTR,
760 MAC2STR(addr));
761
762 ielen = 0;
763 if (wpa_tdls_get_privacy(sm) && peer->tpk_set && peer->tpk_success) {
764 /* To add FTIE for Teardown request and compute MIC */
765 ielen += sizeof(*ftie);
766 #ifdef CONFIG_TDLS_TESTING
767 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
768 ielen += 170;
769 #endif /* CONFIG_TDLS_TESTING */
770 }
771
772 rbuf = os_zalloc(ielen + 1);
773 if (rbuf == NULL)
774 return -1;
775 pos = rbuf;
776
777 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success)
778 goto skip_ies;
779
780 ftie = (struct wpa_tdls_ftie *) pos;
781 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
782 /* Using the recent nonce which should be for CONFIRM frame */
783 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
784 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
785 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
786 pos = (u8 *) (ftie + 1);
787 #ifdef CONFIG_TDLS_TESTING
788 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
789 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
790 "FTIE");
791 ftie->ie_len += 170;
792 *pos++ = 255; /* FTIE subelem */
793 *pos++ = 168; /* FTIE subelem length */
794 pos += 168;
795 }
796 #endif /* CONFIG_TDLS_TESTING */
797 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TDLS Teardown handshake",
798 (u8 *) ftie, pos - (u8 *) ftie);
799
800 /* compute MIC before sending */
801 wpa_tdls_linkid(sm, peer, &lnkid);
802 wpa_tdls_key_mic_teardown(peer->tpk.kck, 4, reason_code,
803 dialog_token, (u8 *) &lnkid, (u8 *) ftie,
804 ftie->mic);
805
806 skip_ies:
807 /* TODO: register for a Timeout handler, if Teardown is not received at
808 * the other end, then try again another time */
809
810 /* request driver to send Teardown using this FTIE */
811 wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_TEARDOWN, 0,
812 reason_code, 0, peer->initiator, rbuf, pos - rbuf);
813 os_free(rbuf);
814
815 return 0;
816 }
817
818
wpa_tdls_teardown_link(struct wpa_sm * sm,const u8 * addr,u16 reason_code)819 int wpa_tdls_teardown_link(struct wpa_sm *sm, const u8 *addr, u16 reason_code)
820 {
821 struct wpa_tdls_peer *peer;
822
823 if (sm->tdls_disabled || !sm->tdls_supported)
824 return -1;
825
826 for (peer = sm->tdls; peer; peer = peer->next) {
827 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
828 break;
829 }
830
831 if (peer == NULL) {
832 wpa_printf(MSG_DEBUG, "TDLS: Could not find peer " MACSTR
833 " for link Teardown", MAC2STR(addr));
834 return -1;
835 }
836
837 if (!peer->tpk_success) {
838 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR
839 " not connected - cannot Teardown link", MAC2STR(addr));
840 return -1;
841 }
842
843 return wpa_tdls_do_teardown(sm, peer, reason_code);
844 }
845
846
wpa_tdls_disable_peer_link(struct wpa_sm * sm,struct wpa_tdls_peer * peer)847 static void wpa_tdls_disable_peer_link(struct wpa_sm *sm,
848 struct wpa_tdls_peer *peer)
849 {
850 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
851 wpa_tdls_peer_free(sm, peer);
852 }
853
854
wpa_tdls_disable_unreachable_link(struct wpa_sm * sm,const u8 * addr)855 void wpa_tdls_disable_unreachable_link(struct wpa_sm *sm, const u8 *addr)
856 {
857 struct wpa_tdls_peer *peer;
858
859 for (peer = sm->tdls; peer; peer = peer->next) {
860 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
861 break;
862 }
863
864 if (!peer || !peer->tpk_success) {
865 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR
866 " not connected - cannot teardown unreachable link",
867 MAC2STR(addr));
868 return;
869 }
870
871 if (wpa_tdls_is_external_setup(sm)) {
872 /*
873 * Get us on the base channel, disable the link, send a
874 * teardown packet through the AP, and then reset link data.
875 */
876 if (peer->chan_switch_enabled)
877 wpa_sm_tdls_disable_channel_switch(sm, peer->addr);
878 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, addr);
879 wpa_tdls_send_teardown(sm, addr,
880 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE);
881 wpa_tdls_peer_free(sm, peer);
882 } else {
883 wpa_tdls_disable_peer_link(sm, peer);
884 }
885 }
886
887
wpa_tdls_get_link_status(struct wpa_sm * sm,const u8 * addr)888 const char * wpa_tdls_get_link_status(struct wpa_sm *sm, const u8 *addr)
889 {
890 struct wpa_tdls_peer *peer;
891
892 if (sm->tdls_disabled || !sm->tdls_supported)
893 return "disabled";
894
895 for (peer = sm->tdls; peer; peer = peer->next) {
896 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
897 break;
898 }
899
900 if (peer == NULL)
901 return "peer does not exist";
902
903 if (!peer->tpk_success)
904 return "peer not connected";
905
906 return "connected";
907 }
908
909
wpa_tdls_recv_teardown(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)910 static int wpa_tdls_recv_teardown(struct wpa_sm *sm, const u8 *src_addr,
911 const u8 *buf, size_t len)
912 {
913 struct wpa_tdls_peer *peer = NULL;
914 struct wpa_tdls_ftie *ftie;
915 struct wpa_tdls_lnkid *lnkid;
916 struct wpa_eapol_ie_parse kde;
917 u16 reason_code;
918 const u8 *pos;
919 int ielen;
920
921 /* Find the node and free from the list */
922 for (peer = sm->tdls; peer; peer = peer->next) {
923 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
924 break;
925 }
926
927 if (peer == NULL) {
928 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
929 "Teardown " MACSTR, MAC2STR(src_addr));
930 return 0;
931 }
932
933 pos = buf;
934 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
935
936 reason_code = WPA_GET_LE16(pos);
937 pos += 2;
938
939 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown Request from " MACSTR
940 " (reason code %u)", MAC2STR(src_addr), reason_code);
941
942 ielen = len - (pos - buf); /* start of IE in buf */
943
944 /*
945 * Don't reject the message if failing to parse IEs. The IEs we need are
946 * explicitly checked below. Some APs may add arbitrary padding to the
947 * end of short TDLS frames and that would look like invalid IEs.
948 */
949 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0)
950 wpa_printf(MSG_DEBUG,
951 "TDLS: Failed to parse IEs in Teardown - ignore as an interop workaround");
952
953 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
954 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TDLS "
955 "Teardown");
956 return -1;
957 }
958 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
959
960 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success)
961 goto skip_ftie;
962
963 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
964 wpa_printf(MSG_INFO, "TDLS: No FTIE in TDLS Teardown");
965 return -1;
966 }
967
968 ftie = (struct wpa_tdls_ftie *) kde.ftie;
969
970 /* Process MIC check to see if TDLS Teardown is right */
971 if (wpa_supplicant_verify_tdls_mic_teardown(4, reason_code,
972 peer->dtoken, peer,
973 (u8 *) lnkid, ftie) < 0) {
974 wpa_printf(MSG_DEBUG, "TDLS: MIC failure for TDLS "
975 "Teardown Request from " MACSTR, MAC2STR(src_addr));
976 return -1;
977 }
978
979 skip_ftie:
980 /*
981 * Request the driver to disable the direct link and clear associated
982 * keys.
983 */
984 wpa_tdls_disable_peer_link(sm, peer);
985 return 0;
986 }
987
988
989 /**
990 * wpa_tdls_send_error - To send suitable TDLS status response with
991 * appropriate status code mentioning reason for error/failure.
992 * @dst - MAC addr of Peer station
993 * @tdls_action - TDLS frame type for which error code is sent
994 * @initiator - was this end the initiator of the connection
995 * @status - status code mentioning reason
996 */
997
wpa_tdls_send_error(struct wpa_sm * sm,const u8 * dst,u8 tdls_action,u8 dialog_token,int initiator,u16 status)998 static int wpa_tdls_send_error(struct wpa_sm *sm, const u8 *dst,
999 u8 tdls_action, u8 dialog_token, int initiator,
1000 u16 status)
1001 {
1002 wpa_printf(MSG_DEBUG, "TDLS: Sending error to " MACSTR
1003 " (action=%u status=%u)",
1004 MAC2STR(dst), tdls_action, status);
1005 return wpa_tdls_tpk_send(sm, dst, tdls_action, dialog_token, status,
1006 0, initiator, NULL, 0);
1007 }
1008
1009
1010 static struct wpa_tdls_peer *
wpa_tdls_add_peer(struct wpa_sm * sm,const u8 * addr,int * existing)1011 wpa_tdls_add_peer(struct wpa_sm *sm, const u8 *addr, int *existing)
1012 {
1013 struct wpa_tdls_peer *peer;
1014
1015 if (existing)
1016 *existing = 0;
1017 for (peer = sm->tdls; peer; peer = peer->next) {
1018 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) {
1019 if (existing)
1020 *existing = 1;
1021 return peer; /* re-use existing entry */
1022 }
1023 }
1024
1025 wpa_printf(MSG_INFO, "TDLS: Creating peer entry for " MACSTR,
1026 MAC2STR(addr));
1027
1028 peer = os_zalloc(sizeof(*peer));
1029 if (peer == NULL)
1030 return NULL;
1031
1032 os_memcpy(peer->addr, addr, ETH_ALEN);
1033 peer->next = sm->tdls;
1034 sm->tdls = peer;
1035
1036 return peer;
1037 }
1038
1039
wpa_tdls_send_tpk_m1(struct wpa_sm * sm,struct wpa_tdls_peer * peer)1040 static int wpa_tdls_send_tpk_m1(struct wpa_sm *sm,
1041 struct wpa_tdls_peer *peer)
1042 {
1043 size_t buf_len;
1044 struct wpa_tdls_timeoutie timeoutie;
1045 u16 rsn_capab;
1046 struct wpa_tdls_ftie *ftie;
1047 u8 *rbuf, *pos, *count_pos;
1048 u16 count;
1049 struct rsn_ie_hdr *hdr;
1050 int status;
1051
1052 if (!wpa_tdls_get_privacy(sm)) {
1053 wpa_printf(MSG_DEBUG, "TDLS: No security used on the link");
1054 peer->rsnie_i_len = 0;
1055 goto skip_rsnie;
1056 }
1057
1058 /*
1059 * TPK Handshake Message 1:
1060 * FTIE: ANonce=0, SNonce=initiator nonce MIC=0, DataKDs=(RSNIE_I,
1061 * Timeout Interval IE))
1062 */
1063
1064 /* Filling RSN IE */
1065 hdr = (struct rsn_ie_hdr *) peer->rsnie_i;
1066 hdr->elem_id = WLAN_EID_RSN;
1067 WPA_PUT_LE16(hdr->version, RSN_VERSION);
1068
1069 pos = (u8 *) (hdr + 1);
1070 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
1071 pos += RSN_SELECTOR_LEN;
1072 count_pos = pos;
1073 pos += 2;
1074
1075 count = 0;
1076
1077 /*
1078 * AES-CCMP is the default Encryption preferred for TDLS, so
1079 * RSN IE is filled only with CCMP CIPHER
1080 * Note: TKIP is not used to encrypt TDLS link.
1081 *
1082 * Regardless of the cipher used on the AP connection, select CCMP
1083 * here.
1084 */
1085 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1086 pos += RSN_SELECTOR_LEN;
1087 count++;
1088
1089 WPA_PUT_LE16(count_pos, count);
1090
1091 WPA_PUT_LE16(pos, 1);
1092 pos += 2;
1093 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
1094 pos += RSN_SELECTOR_LEN;
1095
1096 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1097 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
1098 #ifdef CONFIG_TDLS_TESTING
1099 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
1100 wpa_printf(MSG_DEBUG, "TDLS: Use alternative RSN IE for "
1101 "testing");
1102 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1103 }
1104 #endif /* CONFIG_TDLS_TESTING */
1105 WPA_PUT_LE16(pos, rsn_capab);
1106 pos += 2;
1107 #ifdef CONFIG_TDLS_TESTING
1108 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
1109 /* Number of PMKIDs */
1110 *pos++ = 0x00;
1111 *pos++ = 0x00;
1112 }
1113 #endif /* CONFIG_TDLS_TESTING */
1114
1115 hdr->len = (pos - peer->rsnie_i) - 2;
1116 peer->rsnie_i_len = pos - peer->rsnie_i;
1117 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
1118 peer->rsnie_i, peer->rsnie_i_len);
1119
1120 skip_rsnie:
1121 buf_len = 0;
1122 if (wpa_tdls_get_privacy(sm))
1123 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1124 sizeof(struct wpa_tdls_timeoutie);
1125 #ifdef CONFIG_TDLS_TESTING
1126 if (wpa_tdls_get_privacy(sm) &&
1127 (tdls_testing & TDLS_TESTING_LONG_FRAME))
1128 buf_len += 170;
1129 if (tdls_testing & TDLS_TESTING_DIFF_BSSID)
1130 buf_len += sizeof(struct wpa_tdls_lnkid);
1131 #endif /* CONFIG_TDLS_TESTING */
1132 rbuf = os_zalloc(buf_len + 1);
1133 if (rbuf == NULL) {
1134 wpa_tdls_peer_free(sm, peer);
1135 return -1;
1136 }
1137 pos = rbuf;
1138
1139 if (!wpa_tdls_get_privacy(sm))
1140 goto skip_ies;
1141
1142 /* Initiator RSN IE */
1143 pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len);
1144
1145 ftie = (struct wpa_tdls_ftie *) pos;
1146 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1147 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1148
1149 if (os_get_random(peer->inonce, WPA_NONCE_LEN)) {
1150 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1151 "TDLS: Failed to get random data for initiator Nonce");
1152 os_free(rbuf);
1153 wpa_tdls_peer_free(sm, peer);
1154 return -1;
1155 }
1156 wpa_hexdump(MSG_DEBUG, "TDLS: Initiator Nonce for TPK handshake",
1157 peer->inonce, WPA_NONCE_LEN);
1158 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1159
1160 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK Handshake M1",
1161 (u8 *) ftie, sizeof(struct wpa_tdls_ftie));
1162
1163 pos = (u8 *) (ftie + 1);
1164
1165 #ifdef CONFIG_TDLS_TESTING
1166 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1167 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1168 "FTIE");
1169 ftie->ie_len += 170;
1170 *pos++ = 255; /* FTIE subelem */
1171 *pos++ = 168; /* FTIE subelem length */
1172 pos += 168;
1173 }
1174 #endif /* CONFIG_TDLS_TESTING */
1175
1176 /* Lifetime */
1177 peer->lifetime = TPK_LIFETIME;
1178 #ifdef CONFIG_TDLS_TESTING
1179 if (tdls_testing & TDLS_TESTING_SHORT_LIFETIME) {
1180 wpa_printf(MSG_DEBUG, "TDLS: Testing - use short TPK "
1181 "lifetime");
1182 peer->lifetime = 301;
1183 }
1184 if (tdls_testing & TDLS_TESTING_LONG_LIFETIME) {
1185 wpa_printf(MSG_DEBUG, "TDLS: Testing - use long TPK "
1186 "lifetime");
1187 peer->lifetime = 0xffffffff;
1188 }
1189 #endif /* CONFIG_TDLS_TESTING */
1190 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1191 sizeof(timeoutie), peer->lifetime);
1192 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime);
1193
1194 skip_ies:
1195
1196 #ifdef CONFIG_TDLS_TESTING
1197 if (tdls_testing & TDLS_TESTING_DIFF_BSSID) {
1198 wpa_printf(MSG_DEBUG, "TDLS: Testing - use incorrect BSSID in "
1199 "Link Identifier");
1200 struct wpa_tdls_lnkid *l = (struct wpa_tdls_lnkid *) pos;
1201 wpa_tdls_linkid(sm, peer, l);
1202 l->bssid[5] ^= 0x01;
1203 pos += sizeof(*l);
1204 }
1205 #endif /* CONFIG_TDLS_TESTING */
1206
1207 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Request / TPK "
1208 "Handshake Message 1 (peer " MACSTR ")",
1209 MAC2STR(peer->addr));
1210
1211 status = wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_SETUP_REQUEST,
1212 1, 0, 0, peer->initiator, rbuf, pos - rbuf);
1213 os_free(rbuf);
1214
1215 return status;
1216 }
1217
1218
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)1219 static int wpa_tdls_send_tpk_m2(struct wpa_sm *sm,
1220 const unsigned char *src_addr, u8 dtoken,
1221 struct wpa_tdls_lnkid *lnkid,
1222 const struct wpa_tdls_peer *peer)
1223 {
1224 u8 *rbuf, *pos;
1225 size_t buf_len;
1226 u32 lifetime;
1227 struct wpa_tdls_timeoutie timeoutie;
1228 struct wpa_tdls_ftie *ftie;
1229 int status;
1230
1231 buf_len = 0;
1232 if (wpa_tdls_get_privacy(sm)) {
1233 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1234 * Lifetime */
1235 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1236 sizeof(struct wpa_tdls_timeoutie);
1237 #ifdef CONFIG_TDLS_TESTING
1238 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1239 buf_len += 170;
1240 #endif /* CONFIG_TDLS_TESTING */
1241 }
1242
1243 rbuf = os_zalloc(buf_len + 1);
1244 if (rbuf == NULL)
1245 return -1;
1246 pos = rbuf;
1247
1248 if (!wpa_tdls_get_privacy(sm))
1249 goto skip_ies;
1250
1251 /* Peer RSN IE */
1252 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1253
1254 ftie = (struct wpa_tdls_ftie *) pos;
1255 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1256 /* TODO: ftie->mic_control to set 2-RESPONSE */
1257 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1258 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1259 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1260 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK M2",
1261 (u8 *) ftie, sizeof(*ftie));
1262
1263 pos = (u8 *) (ftie + 1);
1264
1265 #ifdef CONFIG_TDLS_TESTING
1266 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1267 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1268 "FTIE");
1269 ftie->ie_len += 170;
1270 *pos++ = 255; /* FTIE subelem */
1271 *pos++ = 168; /* FTIE subelem length */
1272 pos += 168;
1273 }
1274 #endif /* CONFIG_TDLS_TESTING */
1275
1276 /* Lifetime */
1277 lifetime = peer->lifetime;
1278 #ifdef CONFIG_TDLS_TESTING
1279 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_RESP) {
1280 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1281 "lifetime in response");
1282 lifetime++;
1283 }
1284 #endif /* CONFIG_TDLS_TESTING */
1285 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1286 sizeof(timeoutie), lifetime);
1287 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds from initiator",
1288 lifetime);
1289
1290 /* compute MIC before sending */
1291 wpa_tdls_ftie_mic(peer->tpk.kck, 2, (u8 *) lnkid, peer->rsnie_p,
1292 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1293 #ifdef CONFIG_TDLS_TESTING
1294 if (tdls_testing & TDLS_TESTING_WRONG_MIC) {
1295 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong MIC");
1296 ftie->mic[0] ^= 0x01;
1297 }
1298 #endif /* CONFIG_TDLS_TESTING */
1299
1300 skip_ies:
1301 status = wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE,
1302 dtoken, 0, 0, peer->initiator, rbuf,
1303 pos - rbuf);
1304 os_free(rbuf);
1305
1306 return status;
1307 }
1308
1309
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)1310 static int wpa_tdls_send_tpk_m3(struct wpa_sm *sm,
1311 const unsigned char *src_addr, u8 dtoken,
1312 struct wpa_tdls_lnkid *lnkid,
1313 const struct wpa_tdls_peer *peer)
1314 {
1315 u8 *rbuf, *pos;
1316 size_t buf_len;
1317 struct wpa_tdls_ftie *ftie;
1318 struct wpa_tdls_timeoutie timeoutie;
1319 u32 lifetime;
1320 int status;
1321 u32 peer_capab = 0;
1322
1323 buf_len = 0;
1324 if (wpa_tdls_get_privacy(sm)) {
1325 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1326 * Lifetime */
1327 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1328 sizeof(struct wpa_tdls_timeoutie);
1329 #ifdef CONFIG_TDLS_TESTING
1330 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1331 buf_len += 170;
1332 #endif /* CONFIG_TDLS_TESTING */
1333 }
1334
1335 rbuf = os_zalloc(buf_len + 1);
1336 if (rbuf == NULL)
1337 return -1;
1338 pos = rbuf;
1339
1340 if (!wpa_tdls_get_privacy(sm))
1341 goto skip_ies;
1342
1343 /* Peer RSN IE */
1344 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1345
1346 ftie = (struct wpa_tdls_ftie *) pos;
1347 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1348 /*TODO: ftie->mic_control to set 3-CONFIRM */
1349 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1350 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1351 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1352
1353 pos = (u8 *) (ftie + 1);
1354
1355 #ifdef CONFIG_TDLS_TESTING
1356 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1357 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1358 "FTIE");
1359 ftie->ie_len += 170;
1360 *pos++ = 255; /* FTIE subelem */
1361 *pos++ = 168; /* FTIE subelem length */
1362 pos += 168;
1363 }
1364 #endif /* CONFIG_TDLS_TESTING */
1365
1366 /* Lifetime */
1367 lifetime = peer->lifetime;
1368 #ifdef CONFIG_TDLS_TESTING
1369 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_CONF) {
1370 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1371 "lifetime in confirm");
1372 lifetime++;
1373 }
1374 #endif /* CONFIG_TDLS_TESTING */
1375 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1376 sizeof(timeoutie), lifetime);
1377 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds",
1378 lifetime);
1379
1380 /* compute MIC before sending */
1381 wpa_tdls_ftie_mic(peer->tpk.kck, 3, (u8 *) lnkid, peer->rsnie_p,
1382 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1383 #ifdef CONFIG_TDLS_TESTING
1384 if (tdls_testing & TDLS_TESTING_WRONG_MIC) {
1385 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong MIC");
1386 ftie->mic[0] ^= 0x01;
1387 }
1388 #endif /* CONFIG_TDLS_TESTING */
1389
1390 skip_ies:
1391
1392 if (peer->vht_capabilities)
1393 peer_capab |= TDLS_PEER_VHT;
1394 if (peer->ht_capabilities)
1395 peer_capab |= TDLS_PEER_HT;
1396 if (peer->wmm_capable)
1397 peer_capab |= TDLS_PEER_WMM;
1398
1399 status = wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM,
1400 dtoken, 0, peer_capab, peer->initiator,
1401 rbuf, pos - rbuf);
1402 os_free(rbuf);
1403
1404 return status;
1405 }
1406
1407
wpa_tdls_send_discovery_response(struct wpa_sm * sm,struct wpa_tdls_peer * peer,u8 dialog_token)1408 static int wpa_tdls_send_discovery_response(struct wpa_sm *sm,
1409 struct wpa_tdls_peer *peer,
1410 u8 dialog_token)
1411 {
1412 size_t buf_len = 0;
1413 struct wpa_tdls_timeoutie timeoutie;
1414 u16 rsn_capab;
1415 u8 *rbuf, *pos, *count_pos;
1416 u16 count;
1417 struct rsn_ie_hdr *hdr;
1418 int status;
1419
1420 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Discovery Response "
1421 "(peer " MACSTR ")", MAC2STR(peer->addr));
1422 if (!wpa_tdls_get_privacy(sm))
1423 goto skip_rsn_ies;
1424
1425 /* Filling RSN IE */
1426 hdr = (struct rsn_ie_hdr *) peer->rsnie_i;
1427 hdr->elem_id = WLAN_EID_RSN;
1428 WPA_PUT_LE16(hdr->version, RSN_VERSION);
1429 pos = (u8 *) (hdr + 1);
1430 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
1431 pos += RSN_SELECTOR_LEN;
1432 count_pos = pos;
1433 pos += 2;
1434 count = 0;
1435
1436 /*
1437 * AES-CCMP is the default encryption preferred for TDLS, so
1438 * RSN IE is filled only with CCMP cipher suite.
1439 * Note: TKIP is not used to encrypt TDLS link.
1440 *
1441 * Regardless of the cipher used on the AP connection, select CCMP
1442 * here.
1443 */
1444 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1445 pos += RSN_SELECTOR_LEN;
1446 count++;
1447 WPA_PUT_LE16(count_pos, count);
1448 WPA_PUT_LE16(pos, 1);
1449 pos += 2;
1450 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
1451 pos += RSN_SELECTOR_LEN;
1452
1453 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1454 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
1455 WPA_PUT_LE16(pos, rsn_capab);
1456 pos += 2;
1457 hdr->len = (pos - (u8 *) hdr) - 2;
1458 peer->rsnie_i_len = pos - peer->rsnie_i;
1459
1460 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for Discovery Response",
1461 (u8 *) hdr, hdr->len + 2);
1462 skip_rsn_ies:
1463 buf_len = 0;
1464 if (wpa_tdls_get_privacy(sm)) {
1465 /* Peer RSN IE, Lifetime */
1466 buf_len += peer->rsnie_i_len +
1467 sizeof(struct wpa_tdls_timeoutie);
1468 }
1469 rbuf = os_zalloc(buf_len + 1);
1470 if (rbuf == NULL) {
1471 wpa_tdls_peer_free(sm, peer);
1472 return -1;
1473 }
1474 pos = rbuf;
1475
1476 if (!wpa_tdls_get_privacy(sm))
1477 goto skip_ies;
1478 /* Initiator RSN IE */
1479 pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len);
1480 /* Lifetime */
1481 peer->lifetime = TPK_LIFETIME;
1482 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1483 sizeof(timeoutie), peer->lifetime);
1484 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime);
1485 skip_ies:
1486 status = wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_DISCOVERY_RESPONSE,
1487 dialog_token, 0, 0, 0, rbuf, pos - rbuf);
1488 os_free(rbuf);
1489
1490 return status;
1491 }
1492
1493
1494 static int
wpa_tdls_process_discovery_request(struct wpa_sm * sm,const u8 * addr,const u8 * buf,size_t len)1495 wpa_tdls_process_discovery_request(struct wpa_sm *sm, const u8 *addr,
1496 const u8 *buf, size_t len)
1497 {
1498 struct wpa_eapol_ie_parse kde;
1499 const struct wpa_tdls_lnkid *lnkid;
1500 struct wpa_tdls_peer *peer;
1501 size_t min_req_len = sizeof(struct wpa_tdls_frame) +
1502 1 /* dialog token */ + sizeof(struct wpa_tdls_lnkid);
1503 u8 dialog_token;
1504
1505 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from " MACSTR,
1506 MAC2STR(addr));
1507
1508 if (len < min_req_len) {
1509 wpa_printf(MSG_DEBUG, "TDLS Discovery Request is too short: "
1510 "%d", (int) len);
1511 return -1;
1512 }
1513
1514 dialog_token = buf[sizeof(struct wpa_tdls_frame)];
1515
1516 /*
1517 * Some APs will tack on a weird IE to the end of a TDLS
1518 * discovery request packet. This needn't fail the response,
1519 * since the required IE are verified separately.
1520 */
1521 if (wpa_supplicant_parse_ies(buf + sizeof(struct wpa_tdls_frame) + 1,
1522 len - (sizeof(struct wpa_tdls_frame) + 1),
1523 &kde) < 0) {
1524 wpa_printf(MSG_DEBUG,
1525 "TDLS: Failed to parse IEs in Discovery Request - ignore as an interop workaround");
1526 }
1527
1528 if (!kde.lnkid) {
1529 wpa_printf(MSG_DEBUG, "TDLS: Link ID not found in Discovery "
1530 "Request");
1531 return -1;
1532 }
1533
1534 lnkid = (const struct wpa_tdls_lnkid *) kde.lnkid;
1535
1536 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1537 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from different "
1538 " BSS " MACSTR, MAC2STR(lnkid->bssid));
1539 return -1;
1540 }
1541
1542 peer = wpa_tdls_add_peer(sm, addr, NULL);
1543 if (peer == NULL)
1544 return -1;
1545
1546 return wpa_tdls_send_discovery_response(sm, peer, dialog_token);
1547 }
1548
1549
wpa_tdls_send_discovery_request(struct wpa_sm * sm,const u8 * addr)1550 int wpa_tdls_send_discovery_request(struct wpa_sm *sm, const u8 *addr)
1551 {
1552 if (sm->tdls_disabled || !sm->tdls_supported)
1553 return -1;
1554
1555 wpa_printf(MSG_DEBUG, "TDLS: Sending Discovery Request to peer "
1556 MACSTR, MAC2STR(addr));
1557 return wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_DISCOVERY_REQUEST,
1558 1, 0, 0, 1, NULL, 0);
1559 }
1560
1561
copy_supp_rates(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1562 static int copy_supp_rates(const struct wpa_eapol_ie_parse *kde,
1563 struct wpa_tdls_peer *peer)
1564 {
1565 if (!kde->supp_rates) {
1566 wpa_printf(MSG_DEBUG, "TDLS: No supported rates received");
1567 return -1;
1568 }
1569 peer->supp_rates_len = merge_byte_arrays(
1570 peer->supp_rates, sizeof(peer->supp_rates),
1571 kde->supp_rates + 2, kde->supp_rates_len - 2,
1572 kde->ext_supp_rates ? kde->ext_supp_rates + 2 : NULL,
1573 kde->ext_supp_rates_len - 2);
1574 return 0;
1575 }
1576
1577
copy_peer_ht_capab(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1578 static int copy_peer_ht_capab(const struct wpa_eapol_ie_parse *kde,
1579 struct wpa_tdls_peer *peer)
1580 {
1581 if (!kde->ht_capabilities) {
1582 wpa_printf(MSG_DEBUG, "TDLS: No supported ht capabilities "
1583 "received");
1584 return 0;
1585 }
1586
1587 if (!peer->ht_capabilities) {
1588 peer->ht_capabilities =
1589 os_zalloc(sizeof(struct ieee80211_ht_capabilities));
1590 if (peer->ht_capabilities == NULL)
1591 return -1;
1592 }
1593
1594 os_memcpy(peer->ht_capabilities, kde->ht_capabilities,
1595 sizeof(struct ieee80211_ht_capabilities));
1596 wpa_hexdump(MSG_DEBUG, "TDLS: Peer HT capabilities",
1597 (u8 *) peer->ht_capabilities,
1598 sizeof(struct ieee80211_ht_capabilities));
1599
1600 return 0;
1601 }
1602
1603
copy_peer_vht_capab(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1604 static int copy_peer_vht_capab(const struct wpa_eapol_ie_parse *kde,
1605 struct wpa_tdls_peer *peer)
1606 {
1607 if (!kde->vht_capabilities) {
1608 wpa_printf(MSG_DEBUG, "TDLS: No supported vht capabilities "
1609 "received");
1610 return 0;
1611 }
1612
1613 if (!peer->vht_capabilities) {
1614 peer->vht_capabilities =
1615 os_zalloc(sizeof(struct ieee80211_vht_capabilities));
1616 if (peer->vht_capabilities == NULL)
1617 return -1;
1618 }
1619
1620 os_memcpy(peer->vht_capabilities, kde->vht_capabilities,
1621 sizeof(struct ieee80211_vht_capabilities));
1622 wpa_hexdump(MSG_DEBUG, "TDLS: Peer VHT capabilities",
1623 (u8 *) peer->vht_capabilities,
1624 sizeof(struct ieee80211_vht_capabilities));
1625
1626 return 0;
1627 }
1628
1629
copy_peer_ext_capab(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1630 static int copy_peer_ext_capab(const struct wpa_eapol_ie_parse *kde,
1631 struct wpa_tdls_peer *peer)
1632 {
1633 if (!kde->ext_capab) {
1634 wpa_printf(MSG_DEBUG, "TDLS: No extended capabilities "
1635 "received");
1636 return 0;
1637 }
1638
1639 if (!peer->ext_capab || peer->ext_capab_len < kde->ext_capab_len - 2) {
1640 /* Need to allocate buffer to fit the new information */
1641 os_free(peer->ext_capab);
1642 peer->ext_capab = os_zalloc(kde->ext_capab_len - 2);
1643 if (peer->ext_capab == NULL)
1644 return -1;
1645 }
1646
1647 peer->ext_capab_len = kde->ext_capab_len - 2;
1648 os_memcpy(peer->ext_capab, kde->ext_capab + 2, peer->ext_capab_len);
1649
1650 return 0;
1651 }
1652
1653
copy_peer_wmm_capab(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1654 static int copy_peer_wmm_capab(const struct wpa_eapol_ie_parse *kde,
1655 struct wpa_tdls_peer *peer)
1656 {
1657 struct wmm_information_element *wmm;
1658
1659 if (!kde->wmm) {
1660 wpa_printf(MSG_DEBUG, "TDLS: No supported WMM capabilities received");
1661 return 0;
1662 }
1663
1664 if (kde->wmm_len < sizeof(struct wmm_information_element)) {
1665 wpa_printf(MSG_DEBUG, "TDLS: Invalid supported WMM capabilities received");
1666 return -1;
1667 }
1668
1669 wmm = (struct wmm_information_element *) kde->wmm;
1670 peer->qos_info = wmm->qos_info;
1671
1672 peer->wmm_capable = 1;
1673
1674 wpa_printf(MSG_DEBUG, "TDLS: Peer WMM QOS Info 0x%x", peer->qos_info);
1675 return 0;
1676 }
1677
1678
copy_peer_supp_channels(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1679 static int copy_peer_supp_channels(const struct wpa_eapol_ie_parse *kde,
1680 struct wpa_tdls_peer *peer)
1681 {
1682 if (!kde->supp_channels) {
1683 wpa_printf(MSG_DEBUG, "TDLS: No supported channels received");
1684 return 0;
1685 }
1686
1687 if (!peer->supp_channels ||
1688 peer->supp_channels_len < kde->supp_channels_len) {
1689 os_free(peer->supp_channels);
1690 peer->supp_channels = os_zalloc(kde->supp_channels_len);
1691 if (peer->supp_channels == NULL)
1692 return -1;
1693 }
1694
1695 peer->supp_channels_len = kde->supp_channels_len;
1696
1697 os_memcpy(peer->supp_channels, kde->supp_channels,
1698 peer->supp_channels_len);
1699 wpa_hexdump(MSG_DEBUG, "TDLS: Peer Supported Channels",
1700 (u8 *) peer->supp_channels, peer->supp_channels_len);
1701 return 0;
1702 }
1703
1704
copy_peer_supp_oper_classes(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1705 static int copy_peer_supp_oper_classes(const struct wpa_eapol_ie_parse *kde,
1706 struct wpa_tdls_peer *peer)
1707 {
1708 if (!kde->supp_oper_classes) {
1709 wpa_printf(MSG_DEBUG, "TDLS: No supported operating classes received");
1710 return 0;
1711 }
1712
1713 if (!peer->supp_oper_classes ||
1714 peer->supp_oper_classes_len < kde->supp_oper_classes_len) {
1715 os_free(peer->supp_oper_classes);
1716 peer->supp_oper_classes = os_zalloc(kde->supp_oper_classes_len);
1717 if (peer->supp_oper_classes == NULL)
1718 return -1;
1719 }
1720
1721 peer->supp_oper_classes_len = kde->supp_oper_classes_len;
1722 os_memcpy(peer->supp_oper_classes, kde->supp_oper_classes,
1723 peer->supp_oper_classes_len);
1724 wpa_hexdump(MSG_DEBUG, "TDLS: Peer Supported Operating Classes",
1725 (u8 *) peer->supp_oper_classes,
1726 peer->supp_oper_classes_len);
1727 return 0;
1728 }
1729
1730
wpa_tdls_addset_peer(struct wpa_sm * sm,struct wpa_tdls_peer * peer,int add)1731 static int wpa_tdls_addset_peer(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
1732 int add)
1733 {
1734 return wpa_sm_tdls_peer_addset(sm, peer->addr, add, peer->aid,
1735 peer->capability,
1736 peer->supp_rates, peer->supp_rates_len,
1737 peer->ht_capabilities,
1738 peer->vht_capabilities,
1739 peer->qos_info, peer->wmm_capable,
1740 peer->ext_capab, peer->ext_capab_len,
1741 peer->supp_channels,
1742 peer->supp_channels_len,
1743 peer->supp_oper_classes,
1744 peer->supp_oper_classes_len);
1745 }
1746
1747
wpa_tdls_process_tpk_m1(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)1748 static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr,
1749 const u8 *buf, size_t len)
1750 {
1751 struct wpa_tdls_peer *peer;
1752 struct wpa_eapol_ie_parse kde;
1753 struct wpa_ie_data ie;
1754 int cipher;
1755 const u8 *cpos;
1756 struct wpa_tdls_ftie *ftie = NULL;
1757 struct wpa_tdls_timeoutie *timeoutie;
1758 struct wpa_tdls_lnkid *lnkid;
1759 u32 lifetime = 0;
1760 #if 0
1761 struct rsn_ie_hdr *hdr;
1762 u8 *pos;
1763 u16 rsn_capab;
1764 u16 rsn_ver;
1765 #endif
1766 u8 dtoken;
1767 u16 ielen;
1768 u16 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
1769 int tdls_prohibited = sm->tdls_prohibited;
1770 int existing_peer = 0;
1771
1772 if (len < 3 + 3)
1773 return -1;
1774
1775 cpos = buf;
1776 cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1777
1778 /* driver had already verified the frame format */
1779 dtoken = *cpos++; /* dialog token */
1780
1781 wpa_printf(MSG_INFO, "TDLS: Dialog Token in TPK M1 %d", dtoken);
1782
1783 peer = wpa_tdls_add_peer(sm, src_addr, &existing_peer);
1784 if (peer == NULL)
1785 goto error;
1786
1787 /* If found, use existing entry instead of adding a new one;
1788 * how to handle the case where both ends initiate at the
1789 * same time? */
1790 if (existing_peer) {
1791 if (peer->tpk_success) {
1792 wpa_printf(MSG_DEBUG, "TDLS: TDLS Setup Request while "
1793 "direct link is enabled - tear down the "
1794 "old link first");
1795 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
1796 wpa_tdls_peer_clear(sm, peer);
1797 } else if (peer->initiator) {
1798 /*
1799 * An entry is already present, so check if we already
1800 * sent a TDLS Setup Request. If so, compare MAC
1801 * addresses and let the STA with the lower MAC address
1802 * continue as the initiator. The other negotiation is
1803 * terminated.
1804 */
1805 if (os_memcmp(sm->own_addr, src_addr, ETH_ALEN) < 0) {
1806 wpa_printf(MSG_DEBUG, "TDLS: Discard request "
1807 "from peer with higher address "
1808 MACSTR, MAC2STR(src_addr));
1809 return -1;
1810 } else {
1811 wpa_printf(MSG_DEBUG, "TDLS: Accept request "
1812 "from peer with lower address "
1813 MACSTR " (terminate previously "
1814 "initiated negotiation",
1815 MAC2STR(src_addr));
1816 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK,
1817 peer->addr);
1818 wpa_tdls_peer_clear(sm, peer);
1819 }
1820 }
1821 }
1822
1823 /* capability information */
1824 peer->capability = WPA_GET_LE16(cpos);
1825 cpos += 2;
1826
1827 ielen = len - (cpos - buf); /* start of IE in buf */
1828
1829 /*
1830 * Don't reject the message if failing to parse IEs. The IEs we need are
1831 * explicitly checked below. Some APs may add arbitrary padding to the
1832 * end of short TDLS frames and that would look like invalid IEs.
1833 */
1834 if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0)
1835 wpa_printf(MSG_DEBUG,
1836 "TDLS: Failed to parse IEs in TPK M1 - ignore as an interop workaround");
1837
1838 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1839 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
1840 "TPK M1");
1841 goto error;
1842 }
1843 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M1",
1844 kde.lnkid, kde.lnkid_len);
1845 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1846 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1847 wpa_printf(MSG_INFO, "TDLS: TPK M1 from diff BSS");
1848 status = WLAN_STATUS_REQUEST_DECLINED;
1849 goto error;
1850 }
1851
1852 wpa_printf(MSG_DEBUG, "TDLS: TPK M1 - TPK initiator " MACSTR,
1853 MAC2STR(src_addr));
1854
1855 if (copy_supp_rates(&kde, peer) < 0)
1856 goto error;
1857
1858 if (copy_peer_ht_capab(&kde, peer) < 0)
1859 goto error;
1860
1861 if (copy_peer_vht_capab(&kde, peer) < 0)
1862 goto error;
1863
1864 if (copy_peer_ext_capab(&kde, peer) < 0)
1865 goto error;
1866
1867 if (copy_peer_supp_channels(&kde, peer) < 0)
1868 goto error;
1869
1870 if (copy_peer_supp_oper_classes(&kde, peer) < 0)
1871 goto error;
1872
1873 peer->qos_info = kde.qosinfo;
1874
1875 /* Overwrite with the qos_info obtained in WMM IE */
1876 if (copy_peer_wmm_capab(&kde, peer) < 0)
1877 goto error;
1878
1879 peer->aid = kde.aid;
1880
1881 #ifdef CONFIG_TDLS_TESTING
1882 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
1883 peer = wpa_tdls_add_peer(sm, src_addr, NULL);
1884 if (peer == NULL)
1885 goto error;
1886 wpa_printf(MSG_DEBUG, "TDLS: Testing concurrent initiation of "
1887 "TDLS setup - send own request");
1888 peer->initiator = 1;
1889 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL,
1890 NULL, 0, 0, NULL, 0, NULL, 0, NULL, 0);
1891 wpa_tdls_send_tpk_m1(sm, peer);
1892 }
1893
1894 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
1895 tdls_prohibited) {
1896 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
1897 "on TDLS");
1898 tdls_prohibited = 0;
1899 }
1900 #endif /* CONFIG_TDLS_TESTING */
1901
1902 if (tdls_prohibited) {
1903 wpa_printf(MSG_INFO, "TDLS: TDLS prohibited in this BSS");
1904 status = WLAN_STATUS_REQUEST_DECLINED;
1905 goto error;
1906 }
1907
1908 if (!wpa_tdls_get_privacy(sm)) {
1909 if (kde.rsn_ie) {
1910 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M1 while "
1911 "security is disabled");
1912 status = WLAN_STATUS_SECURITY_DISABLED;
1913 goto error;
1914 }
1915 goto skip_rsn;
1916 }
1917
1918 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
1919 kde.rsn_ie == NULL) {
1920 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M1");
1921 status = WLAN_STATUS_INVALID_PARAMETERS;
1922 goto error;
1923 }
1924
1925 if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
1926 wpa_printf(MSG_INFO, "TDLS: Too long Initiator RSN IE in "
1927 "TPK M1");
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 M1");
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 M1");
1944 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
1945 goto error;
1946 }
1947
1948 if ((ie.capabilities &
1949 (WPA_CAPABILITY_NO_PAIRWISE | WPA_CAPABILITY_PEERKEY_ENABLED)) !=
1950 WPA_CAPABILITY_PEERKEY_ENABLED) {
1951 wpa_printf(MSG_INFO, "TDLS: Invalid RSN Capabilities in "
1952 "TPK M1");
1953 status = WLAN_STATUS_INVALID_RSN_IE_CAPAB;
1954 goto error;
1955 }
1956
1957 /* Lifetime */
1958 if (kde.key_lifetime == NULL) {
1959 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1");
1960 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1961 goto error;
1962 }
1963 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
1964 lifetime = WPA_GET_LE32(timeoutie->value);
1965 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime);
1966 if (lifetime < 300) {
1967 wpa_printf(MSG_INFO, "TDLS: Too short TPK lifetime");
1968 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1969 goto error;
1970 }
1971
1972 skip_rsn:
1973 #ifdef CONFIG_TDLS_TESTING
1974 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
1975 if (os_memcmp(sm->own_addr, peer->addr, ETH_ALEN) < 0) {
1976 /*
1977 * The request frame from us is going to win, so do not
1978 * replace information based on this request frame from
1979 * the peer.
1980 */
1981 goto skip_rsn_check;
1982 }
1983 }
1984 #endif /* CONFIG_TDLS_TESTING */
1985
1986 peer->initiator = 0; /* Need to check */
1987 peer->dtoken = dtoken;
1988
1989 if (!wpa_tdls_get_privacy(sm)) {
1990 peer->rsnie_i_len = 0;
1991 peer->rsnie_p_len = 0;
1992 peer->cipher = WPA_CIPHER_NONE;
1993 goto skip_rsn_check;
1994 }
1995
1996 ftie = (struct wpa_tdls_ftie *) kde.ftie;
1997 os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
1998 peer->rsnie_i_len = kde.rsn_ie_len;
1999 peer->cipher = cipher;
2000
2001 if (os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) != 0) {
2002 /*
2003 * There is no point in updating the RNonce for every obtained
2004 * TPK M1 frame (e.g., retransmission due to timeout) with the
2005 * same INonce (SNonce in FTIE). However, if the TPK M1 is
2006 * retransmitted with a different INonce, update the RNonce
2007 * since this is for a new TDLS session.
2008 */
2009 wpa_printf(MSG_DEBUG,
2010 "TDLS: New TPK M1 INonce - generate new RNonce");
2011 os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN);
2012 if (os_get_random(peer->rnonce, WPA_NONCE_LEN)) {
2013 wpa_msg(sm->ctx->ctx, MSG_WARNING,
2014 "TDLS: Failed to get random data for responder nonce");
2015 goto error;
2016 }
2017 }
2018
2019 #if 0
2020 /* get version info from RSNIE received from Peer */
2021 hdr = (struct rsn_ie_hdr *) kde.rsn_ie;
2022 rsn_ver = WPA_GET_LE16(hdr->version);
2023
2024 /* use min(peer's version, out version) */
2025 if (rsn_ver > RSN_VERSION)
2026 rsn_ver = RSN_VERSION;
2027
2028 hdr = (struct rsn_ie_hdr *) peer->rsnie_p;
2029
2030 hdr->elem_id = WLAN_EID_RSN;
2031 WPA_PUT_LE16(hdr->version, rsn_ver);
2032 pos = (u8 *) (hdr + 1);
2033
2034 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
2035 pos += RSN_SELECTOR_LEN;
2036 /* Include only the selected cipher in pairwise cipher suite */
2037 WPA_PUT_LE16(pos, 1);
2038 pos += 2;
2039 if (cipher == WPA_CIPHER_CCMP)
2040 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
2041 pos += RSN_SELECTOR_LEN;
2042
2043 WPA_PUT_LE16(pos, 1);
2044 pos += 2;
2045 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
2046 pos += RSN_SELECTOR_LEN;
2047
2048 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
2049 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
2050 WPA_PUT_LE16(pos, rsn_capab);
2051 pos += 2;
2052
2053 hdr->len = (pos - peer->rsnie_p) - 2;
2054 peer->rsnie_p_len = pos - peer->rsnie_p;
2055 #endif
2056
2057 /* temp fix: validation of RSNIE later */
2058 os_memcpy(peer->rsnie_p, peer->rsnie_i, peer->rsnie_i_len);
2059 peer->rsnie_p_len = peer->rsnie_i_len;
2060
2061 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
2062 peer->rsnie_p, peer->rsnie_p_len);
2063
2064 peer->lifetime = lifetime;
2065
2066 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
2067
2068 skip_rsn_check:
2069 #ifdef CONFIG_TDLS_TESTING
2070 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT)
2071 goto skip_add_peer;
2072 #endif /* CONFIG_TDLS_TESTING */
2073
2074 /* add supported rates, capabilities, and qos_info to the TDLS peer */
2075 if (wpa_tdls_addset_peer(sm, peer, 1) < 0)
2076 goto error;
2077
2078 #ifdef CONFIG_TDLS_TESTING
2079 skip_add_peer:
2080 #endif /* CONFIG_TDLS_TESTING */
2081 peer->tpk_in_progress = 1;
2082
2083 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Response / TPK M2");
2084 if (wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer) < 0) {
2085 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2086 goto error;
2087 }
2088
2089 return 0;
2090
2091 error:
2092 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0,
2093 status);
2094 if (peer)
2095 wpa_tdls_peer_free(sm, peer);
2096 return -1;
2097 }
2098
2099
wpa_tdls_enable_link(struct wpa_sm * sm,struct wpa_tdls_peer * peer)2100 static int wpa_tdls_enable_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
2101 {
2102 peer->tpk_success = 1;
2103 peer->tpk_in_progress = 0;
2104 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
2105 if (wpa_tdls_get_privacy(sm)) {
2106 u32 lifetime = peer->lifetime;
2107 /*
2108 * Start the initiator process a bit earlier to avoid race
2109 * condition with the responder sending teardown request.
2110 */
2111 if (lifetime > 3 && peer->initiator)
2112 lifetime -= 3;
2113 eloop_register_timeout(lifetime, 0, wpa_tdls_tpk_timeout,
2114 sm, peer);
2115 #ifdef CONFIG_TDLS_TESTING
2116 if (tdls_testing & TDLS_TESTING_NO_TPK_EXPIRATION) {
2117 wpa_printf(MSG_DEBUG, "TDLS: Testing - disable TPK "
2118 "expiration");
2119 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
2120 }
2121 #endif /* CONFIG_TDLS_TESTING */
2122 }
2123
2124 if (peer->reconfig_key && wpa_tdls_set_key(sm, peer) < 0) {
2125 wpa_printf(MSG_INFO, "TDLS: Could not configure key to the "
2126 "driver");
2127 return -1;
2128 }
2129 peer->reconfig_key = 0;
2130
2131 return wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, peer->addr);
2132 }
2133
2134
wpa_tdls_process_tpk_m2(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)2135 static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
2136 const u8 *buf, size_t len)
2137 {
2138 struct wpa_tdls_peer *peer;
2139 struct wpa_eapol_ie_parse kde;
2140 struct wpa_ie_data ie;
2141 int cipher;
2142 struct wpa_tdls_ftie *ftie;
2143 struct wpa_tdls_timeoutie *timeoutie;
2144 struct wpa_tdls_lnkid *lnkid;
2145 u32 lifetime;
2146 u8 dtoken;
2147 int ielen;
2148 u16 status;
2149 const u8 *pos;
2150 int ret = 0;
2151
2152 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Response / TPK M2 "
2153 "(Peer " MACSTR ")", MAC2STR(src_addr));
2154 for (peer = sm->tdls; peer; peer = peer->next) {
2155 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
2156 break;
2157 }
2158 if (peer == NULL) {
2159 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
2160 "TPK M2: " MACSTR, MAC2STR(src_addr));
2161 return -1;
2162 }
2163 if (!peer->initiator) {
2164 /*
2165 * This may happen if both devices try to initiate TDLS at the
2166 * same time and we accept the TPK M1 from the peer in
2167 * wpa_tdls_process_tpk_m1() and clear our previous state.
2168 */
2169 wpa_printf(MSG_INFO, "TDLS: We were not the initiator, so "
2170 "ignore TPK M2 from " MACSTR, MAC2STR(src_addr));
2171 return -1;
2172 }
2173 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_REQUEST);
2174
2175 if (len < 3 + 2 + 1) {
2176 wpa_tdls_disable_peer_link(sm, peer);
2177 return -1;
2178 }
2179
2180 pos = buf;
2181 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
2182 status = WPA_GET_LE16(pos);
2183 pos += 2 /* status code */;
2184
2185 if (status != WLAN_STATUS_SUCCESS) {
2186 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M2: %u",
2187 status);
2188 wpa_tdls_disable_peer_link(sm, peer);
2189 return -1;
2190 }
2191
2192 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
2193
2194 /* TODO: need to verify dialog token matches here or in kernel */
2195 dtoken = *pos++; /* dialog token */
2196
2197 wpa_printf(MSG_DEBUG, "TDLS: Dialog Token in TPK M2 %d", dtoken);
2198
2199 if (len < 3 + 2 + 1 + 2) {
2200 wpa_tdls_disable_peer_link(sm, peer);
2201 return -1;
2202 }
2203
2204 /* capability information */
2205 peer->capability = WPA_GET_LE16(pos);
2206 pos += 2;
2207
2208 ielen = len - (pos - buf); /* start of IE in buf */
2209
2210 /*
2211 * Don't reject the message if failing to parse IEs. The IEs we need are
2212 * explicitly checked below. Some APs may add arbitrary padding to the
2213 * end of short TDLS frames and that would look like invalid IEs.
2214 */
2215 if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0)
2216 wpa_printf(MSG_DEBUG,
2217 "TDLS: Failed to parse IEs in TPK M2 - ignore as an interop workaround");
2218
2219 #ifdef CONFIG_TDLS_TESTING
2220 if (tdls_testing & TDLS_TESTING_DECLINE_RESP) {
2221 wpa_printf(MSG_DEBUG, "TDLS: Testing - decline response");
2222 status = WLAN_STATUS_REQUEST_DECLINED;
2223 goto error;
2224 }
2225 #endif /* CONFIG_TDLS_TESTING */
2226
2227 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
2228 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
2229 "TPK M2");
2230 goto error;
2231 }
2232 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M2",
2233 kde.lnkid, kde.lnkid_len);
2234 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
2235
2236 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
2237 wpa_printf(MSG_INFO, "TDLS: TPK M2 from different BSS");
2238 status = WLAN_STATUS_NOT_IN_SAME_BSS;
2239 goto error;
2240 }
2241
2242 if (copy_supp_rates(&kde, peer) < 0)
2243 goto error;
2244
2245 if (copy_peer_ht_capab(&kde, peer) < 0)
2246 goto error;
2247
2248 if (copy_peer_vht_capab(&kde, peer) < 0)
2249 goto error;
2250
2251 if (copy_peer_ext_capab(&kde, peer) < 0)
2252 goto error;
2253
2254 if (copy_peer_supp_channels(&kde, peer) < 0)
2255 goto error;
2256
2257 if (copy_peer_supp_oper_classes(&kde, peer) < 0)
2258 goto error;
2259
2260 peer->qos_info = kde.qosinfo;
2261
2262 /* Overwrite with the qos_info obtained in WMM IE */
2263 if (copy_peer_wmm_capab(&kde, peer) < 0)
2264 goto error;
2265
2266 peer->aid = kde.aid;
2267
2268 if (!wpa_tdls_get_privacy(sm)) {
2269 peer->rsnie_p_len = 0;
2270 peer->cipher = WPA_CIPHER_NONE;
2271 goto skip_rsn;
2272 }
2273
2274 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
2275 kde.rsn_ie == NULL) {
2276 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M2");
2277 status = WLAN_STATUS_INVALID_PARAMETERS;
2278 goto error;
2279 }
2280 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
2281 kde.rsn_ie, kde.rsn_ie_len);
2282
2283 if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
2284 wpa_printf(MSG_INFO,
2285 "TDLS: Too long Responder RSN IE in TPK M2");
2286 status = WLAN_STATUS_INVALID_RSNIE;
2287 goto error;
2288 }
2289
2290 /*
2291 * FIX: bitwise comparison of RSN IE is not the correct way of
2292 * validation this. It can be different, but certain fields must
2293 * match. Since we list only a single pairwise cipher in TPK M1, the
2294 * memcmp is likely to work in most cases, though.
2295 */
2296 if (kde.rsn_ie_len != peer->rsnie_i_len ||
2297 os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) != 0) {
2298 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M2 does "
2299 "not match with RSN IE used in TPK M1");
2300 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Sent in TPK M1",
2301 peer->rsnie_i, peer->rsnie_i_len);
2302 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
2303 kde.rsn_ie, kde.rsn_ie_len);
2304 status = WLAN_STATUS_INVALID_RSNIE;
2305 goto error;
2306 }
2307
2308 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
2309 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M2");
2310 status = WLAN_STATUS_INVALID_RSNIE;
2311 goto error;
2312 }
2313
2314 cipher = ie.pairwise_cipher;
2315 if (cipher == WPA_CIPHER_CCMP) {
2316 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
2317 cipher = WPA_CIPHER_CCMP;
2318 } else {
2319 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M2");
2320 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
2321 goto error;
2322 }
2323
2324 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M2",
2325 kde.ftie, sizeof(*ftie));
2326 ftie = (struct wpa_tdls_ftie *) kde.ftie;
2327
2328 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
2329 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does "
2330 "not match with FTIE SNonce used in TPK M1");
2331 /* Silently discard the frame */
2332 return -1;
2333 }
2334
2335 /* Responder Nonce and RSN IE */
2336 os_memcpy(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN);
2337 os_memcpy(peer->rsnie_p, kde.rsn_ie, kde.rsn_ie_len);
2338 peer->rsnie_p_len = kde.rsn_ie_len;
2339 peer->cipher = cipher;
2340
2341 /* Lifetime */
2342 if (kde.key_lifetime == NULL) {
2343 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M2");
2344 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
2345 goto error;
2346 }
2347 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
2348 lifetime = WPA_GET_LE32(timeoutie->value);
2349 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M2",
2350 lifetime);
2351 if (lifetime != peer->lifetime) {
2352 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
2353 "TPK M2 (expected %u)", lifetime, peer->lifetime);
2354 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
2355 goto error;
2356 }
2357
2358 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
2359
2360 /* Process MIC check to see if TPK M2 is right */
2361 if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid,
2362 (u8 *) timeoutie, ftie) < 0) {
2363 /* Discard the frame */
2364 wpa_tdls_del_key(sm, peer);
2365 wpa_tdls_disable_peer_link(sm, peer);
2366 return -1;
2367 }
2368
2369 if (wpa_tdls_set_key(sm, peer) < 0) {
2370 /*
2371 * Some drivers may not be able to config the key prior to full
2372 * STA entry having been configured.
2373 */
2374 wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after "
2375 "STA entry is complete");
2376 peer->reconfig_key = 1;
2377 }
2378
2379 skip_rsn:
2380 peer->dtoken = dtoken;
2381
2382 /* add supported rates, capabilities, and qos_info to the TDLS peer */
2383 if (wpa_tdls_addset_peer(sm, peer, 0) < 0)
2384 goto error;
2385
2386 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Confirm / "
2387 "TPK Handshake Message 3");
2388 if (wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer) < 0)
2389 goto error;
2390
2391 if (!peer->tpk_success) {
2392 /*
2393 * Enable Link only when tpk_success is 0, signifying that this
2394 * processing of TPK M2 frame is not because of a retransmission
2395 * during TDLS setup handshake.
2396 */
2397 ret = wpa_tdls_enable_link(sm, peer);
2398 if (ret < 0) {
2399 wpa_printf(MSG_DEBUG, "TDLS: Could not enable link");
2400 wpa_tdls_do_teardown(
2401 sm, peer,
2402 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
2403 }
2404 }
2405 return ret;
2406
2407 error:
2408 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 1,
2409 status);
2410 wpa_tdls_disable_peer_link(sm, peer);
2411 return -1;
2412 }
2413
2414
wpa_tdls_process_tpk_m3(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)2415 static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr,
2416 const u8 *buf, size_t len)
2417 {
2418 struct wpa_tdls_peer *peer;
2419 struct wpa_eapol_ie_parse kde;
2420 struct wpa_tdls_ftie *ftie;
2421 struct wpa_tdls_timeoutie *timeoutie;
2422 struct wpa_tdls_lnkid *lnkid;
2423 int ielen;
2424 u16 status;
2425 const u8 *pos;
2426 u32 lifetime;
2427 int ret = 0;
2428
2429 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Confirm / TPK M3 "
2430 "(Peer " MACSTR ")", MAC2STR(src_addr));
2431 for (peer = sm->tdls; peer; peer = peer->next) {
2432 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
2433 break;
2434 }
2435 if (peer == NULL) {
2436 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
2437 "TPK M3: " MACSTR, MAC2STR(src_addr));
2438 return -1;
2439 }
2440 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_RESPONSE);
2441
2442 if (len < 3 + 3)
2443 goto error;
2444 pos = buf;
2445 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
2446
2447 status = WPA_GET_LE16(pos);
2448
2449 if (status != 0) {
2450 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M3: %u",
2451 status);
2452 goto error;
2453 }
2454 pos += 2 /* status code */ + 1 /* dialog token */;
2455
2456 ielen = len - (pos - buf); /* start of IE in buf */
2457
2458 /*
2459 * Don't reject the message if failing to parse IEs. The IEs we need are
2460 * explicitly checked below. Some APs piggy-back broken IEs to the end
2461 * of a TDLS Confirm packet, which will fail the link if we don't ignore
2462 * this error.
2463 */
2464 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) {
2465 wpa_printf(MSG_DEBUG,
2466 "TDLS: Failed to parse KDEs in TPK M3 - ignore as an interop workaround");
2467 }
2468
2469 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
2470 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M3");
2471 goto error;
2472 }
2473 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M3",
2474 (u8 *) kde.lnkid, kde.lnkid_len);
2475 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
2476
2477 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
2478 wpa_printf(MSG_INFO, "TDLS: TPK M3 from diff BSS");
2479 goto error;
2480 }
2481
2482 if (!wpa_tdls_get_privacy(sm))
2483 goto skip_rsn;
2484
2485 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
2486 wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M3");
2487 goto error;
2488 }
2489 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M3",
2490 kde.ftie, sizeof(*ftie));
2491 ftie = (struct wpa_tdls_ftie *) kde.ftie;
2492
2493 if (kde.rsn_ie == NULL) {
2494 wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M3");
2495 goto error;
2496 }
2497 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M3",
2498 kde.rsn_ie, kde.rsn_ie_len);
2499 if (kde.rsn_ie_len != peer->rsnie_p_len ||
2500 os_memcmp(kde.rsn_ie, peer->rsnie_p, peer->rsnie_p_len) != 0) {
2501 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M3 does not match "
2502 "with the one sent in TPK M2");
2503 goto error;
2504 }
2505
2506 if (!os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) {
2507 wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does "
2508 "not match with FTIE ANonce used in TPK M2");
2509 goto error;
2510 }
2511
2512 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
2513 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M3 does not "
2514 "match with FTIE SNonce used in TPK M1");
2515 goto error;
2516 }
2517
2518 if (kde.key_lifetime == NULL) {
2519 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M3");
2520 goto error;
2521 }
2522 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
2523 wpa_hexdump(MSG_DEBUG, "TDLS: Timeout IE Received from TPK M3",
2524 (u8 *) timeoutie, sizeof(*timeoutie));
2525 lifetime = WPA_GET_LE32(timeoutie->value);
2526 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M3",
2527 lifetime);
2528 if (lifetime != peer->lifetime) {
2529 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
2530 "TPK M3 (expected %u)", lifetime, peer->lifetime);
2531 goto error;
2532 }
2533
2534 if (wpa_supplicant_verify_tdls_mic(3, peer, (u8 *) lnkid,
2535 (u8 *) timeoutie, ftie) < 0) {
2536 wpa_tdls_del_key(sm, peer);
2537 goto error;
2538 }
2539
2540 if (wpa_tdls_set_key(sm, peer) < 0) {
2541 /*
2542 * Some drivers may not be able to config the key prior to full
2543 * STA entry having been configured.
2544 */
2545 wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after "
2546 "STA entry is complete");
2547 peer->reconfig_key = 1;
2548 }
2549
2550 skip_rsn:
2551 /* add supported rates, capabilities, and qos_info to the TDLS peer */
2552 if (wpa_tdls_addset_peer(sm, peer, 0) < 0)
2553 goto error;
2554
2555 if (!peer->tpk_success) {
2556 /*
2557 * Enable Link only when tpk_success is 0, signifying that this
2558 * processing of TPK M3 frame is not because of a retransmission
2559 * during TDLS setup handshake.
2560 */
2561 ret = wpa_tdls_enable_link(sm, peer);
2562 if (ret < 0) {
2563 wpa_printf(MSG_DEBUG, "TDLS: Could not enable link");
2564 goto error;
2565 }
2566 }
2567 return ret;
2568 error:
2569 wpa_tdls_do_teardown(sm, peer, WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
2570 return -1;
2571 }
2572
2573
wpa_add_tdls_timeoutie(u8 * pos,u8 * ie,size_t ie_len,u32 tsecs)2574 static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs)
2575 {
2576 struct wpa_tdls_timeoutie *lifetime = (struct wpa_tdls_timeoutie *) ie;
2577
2578 os_memset(lifetime, 0, ie_len);
2579 lifetime->ie_type = WLAN_EID_TIMEOUT_INTERVAL;
2580 lifetime->ie_len = sizeof(struct wpa_tdls_timeoutie) - 2;
2581 lifetime->interval_type = WLAN_TIMEOUT_KEY_LIFETIME;
2582 WPA_PUT_LE32(lifetime->value, tsecs);
2583 os_memcpy(pos, ie, ie_len);
2584 return pos + ie_len;
2585 }
2586
2587
2588 /**
2589 * wpa_tdls_start - Initiate TDLS handshake (send TPK Handshake Message 1)
2590 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2591 * @peer: MAC address of the peer STA
2592 * Returns: 0 on success, or -1 on failure
2593 *
2594 * Send TPK Handshake Message 1 info to driver to start TDLS
2595 * handshake with the peer.
2596 */
wpa_tdls_start(struct wpa_sm * sm,const u8 * addr)2597 int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr)
2598 {
2599 struct wpa_tdls_peer *peer;
2600 int tdls_prohibited = sm->tdls_prohibited;
2601
2602 if (sm->tdls_disabled || !sm->tdls_supported)
2603 return -1;
2604
2605 #ifdef CONFIG_TDLS_TESTING
2606 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
2607 tdls_prohibited) {
2608 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
2609 "on TDLS");
2610 tdls_prohibited = 0;
2611 }
2612 #endif /* CONFIG_TDLS_TESTING */
2613
2614 if (tdls_prohibited) {
2615 wpa_printf(MSG_DEBUG, "TDLS: TDLS is prohibited in this BSS - "
2616 "reject request to start setup");
2617 return -1;
2618 }
2619
2620 peer = wpa_tdls_add_peer(sm, addr, NULL);
2621 if (peer == NULL)
2622 return -1;
2623
2624 if (peer->tpk_in_progress) {
2625 wpa_printf(MSG_DEBUG, "TDLS: Setup is already in progress with the peer");
2626 return 0;
2627 }
2628
2629 peer->initiator = 1;
2630
2631 /* add the peer to the driver as a "setup in progress" peer */
2632 if (wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL,
2633 NULL, 0, 0, NULL, 0, NULL, 0, NULL, 0)) {
2634 wpa_tdls_disable_peer_link(sm, peer);
2635 return -1;
2636 }
2637
2638 peer->tpk_in_progress = 1;
2639
2640 if (wpa_tdls_send_tpk_m1(sm, peer) < 0) {
2641 wpa_tdls_disable_peer_link(sm, peer);
2642 return -1;
2643 }
2644
2645 return 0;
2646 }
2647
2648
wpa_tdls_remove(struct wpa_sm * sm,const u8 * addr)2649 void wpa_tdls_remove(struct wpa_sm *sm, const u8 *addr)
2650 {
2651 struct wpa_tdls_peer *peer;
2652
2653 if (sm->tdls_disabled || !sm->tdls_supported)
2654 return;
2655
2656 for (peer = sm->tdls; peer; peer = peer->next) {
2657 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
2658 break;
2659 }
2660
2661 if (peer == NULL || !peer->tpk_success)
2662 return;
2663
2664 if (sm->tdls_external_setup) {
2665 /*
2666 * Disable previous link to allow renegotiation to be completed
2667 * on AP path.
2668 */
2669 wpa_tdls_do_teardown(sm, peer,
2670 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
2671 }
2672 }
2673
2674
2675 /**
2676 * wpa_supplicant_rx_tdls - Receive TDLS data frame
2677 *
2678 * This function is called to receive TDLS (ethertype = 0x890d) data frames.
2679 */
wpa_supplicant_rx_tdls(void * ctx,const u8 * src_addr,const u8 * buf,size_t len)2680 static void wpa_supplicant_rx_tdls(void *ctx, const u8 *src_addr,
2681 const u8 *buf, size_t len)
2682 {
2683 struct wpa_sm *sm = ctx;
2684 struct wpa_tdls_frame *tf;
2685
2686 wpa_hexdump(MSG_DEBUG, "TDLS: Received Data frame encapsulation",
2687 buf, len);
2688
2689 if (sm->tdls_disabled || !sm->tdls_supported) {
2690 wpa_printf(MSG_DEBUG, "TDLS: Discard message - TDLS disabled "
2691 "or unsupported by driver");
2692 return;
2693 }
2694
2695 if (os_memcmp(src_addr, sm->own_addr, ETH_ALEN) == 0) {
2696 wpa_printf(MSG_DEBUG, "TDLS: Discard copy of own message");
2697 return;
2698 }
2699
2700 if (len < sizeof(*tf)) {
2701 wpa_printf(MSG_INFO, "TDLS: Drop too short frame");
2702 return;
2703 }
2704
2705 /* Check to make sure its a valid encapsulated TDLS frame */
2706 tf = (struct wpa_tdls_frame *) buf;
2707 if (tf->payloadtype != 2 /* TDLS_RFTYPE */ ||
2708 tf->category != WLAN_ACTION_TDLS) {
2709 wpa_printf(MSG_INFO, "TDLS: Invalid frame - payloadtype=%u "
2710 "category=%u action=%u",
2711 tf->payloadtype, tf->category, tf->action);
2712 return;
2713 }
2714
2715 switch (tf->action) {
2716 case WLAN_TDLS_SETUP_REQUEST:
2717 wpa_tdls_process_tpk_m1(sm, src_addr, buf, len);
2718 break;
2719 case WLAN_TDLS_SETUP_RESPONSE:
2720 wpa_tdls_process_tpk_m2(sm, src_addr, buf, len);
2721 break;
2722 case WLAN_TDLS_SETUP_CONFIRM:
2723 wpa_tdls_process_tpk_m3(sm, src_addr, buf, len);
2724 break;
2725 case WLAN_TDLS_TEARDOWN:
2726 wpa_tdls_recv_teardown(sm, src_addr, buf, len);
2727 break;
2728 case WLAN_TDLS_DISCOVERY_REQUEST:
2729 wpa_tdls_process_discovery_request(sm, src_addr, buf, len);
2730 break;
2731 default:
2732 /* Kernel code will process remaining frames */
2733 wpa_printf(MSG_DEBUG, "TDLS: Ignore TDLS frame action code %u",
2734 tf->action);
2735 break;
2736 }
2737 }
2738
2739
2740 /**
2741 * wpa_tdls_init - Initialize driver interface parameters for TDLS
2742 * @wpa_s: Pointer to wpa_supplicant data
2743 * Returns: 0 on success, -1 on failure
2744 *
2745 * This function is called to initialize driver interface parameters for TDLS.
2746 * wpa_drv_init() must have been called before this function to initialize the
2747 * driver interface.
2748 */
wpa_tdls_init(struct wpa_sm * sm)2749 int wpa_tdls_init(struct wpa_sm *sm)
2750 {
2751 if (sm == NULL)
2752 return -1;
2753
2754 sm->l2_tdls = l2_packet_init(sm->bridge_ifname ? sm->bridge_ifname :
2755 sm->ifname,
2756 sm->own_addr,
2757 ETH_P_80211_ENCAP, wpa_supplicant_rx_tdls,
2758 sm, 0);
2759 if (sm->l2_tdls == NULL) {
2760 wpa_printf(MSG_ERROR, "TDLS: Failed to open l2_packet "
2761 "connection");
2762 return -1;
2763 }
2764
2765 /*
2766 * Drivers that support TDLS but don't implement the get_capa callback
2767 * are assumed to perform everything internally
2768 */
2769 if (wpa_sm_tdls_get_capa(sm, &sm->tdls_supported,
2770 &sm->tdls_external_setup,
2771 &sm->tdls_chan_switch) < 0) {
2772 sm->tdls_supported = 1;
2773 sm->tdls_external_setup = 0;
2774 }
2775
2776 wpa_printf(MSG_DEBUG, "TDLS: TDLS operation%s supported by "
2777 "driver", sm->tdls_supported ? "" : " not");
2778 wpa_printf(MSG_DEBUG, "TDLS: Driver uses %s link setup",
2779 sm->tdls_external_setup ? "external" : "internal");
2780 wpa_printf(MSG_DEBUG, "TDLS: Driver %s TDLS channel switching",
2781 sm->tdls_chan_switch ? "supports" : "does not support");
2782
2783 return 0;
2784 }
2785
2786
wpa_tdls_teardown_peers(struct wpa_sm * sm)2787 void wpa_tdls_teardown_peers(struct wpa_sm *sm)
2788 {
2789 struct wpa_tdls_peer *peer, *tmp;
2790
2791 if (!sm)
2792 return;
2793 peer = sm->tdls;
2794
2795 wpa_printf(MSG_DEBUG, "TDLS: Tear down peers");
2796
2797 while (peer) {
2798 tmp = peer->next;
2799 wpa_printf(MSG_DEBUG, "TDLS: Tear down peer " MACSTR,
2800 MAC2STR(peer->addr));
2801 if (sm->tdls_external_setup)
2802 wpa_tdls_do_teardown(sm, peer,
2803 WLAN_REASON_DEAUTH_LEAVING);
2804 else
2805 wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr);
2806
2807 peer = tmp;
2808 }
2809 }
2810
2811
wpa_tdls_remove_peers(struct wpa_sm * sm)2812 static void wpa_tdls_remove_peers(struct wpa_sm *sm)
2813 {
2814 struct wpa_tdls_peer *peer, *tmp;
2815
2816 peer = sm->tdls;
2817
2818 while (peer) {
2819 int res;
2820 tmp = peer->next;
2821 res = wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2822 wpa_printf(MSG_DEBUG, "TDLS: Remove peer " MACSTR " (res=%d)",
2823 MAC2STR(peer->addr), res);
2824 wpa_tdls_peer_free(sm, peer);
2825 peer = tmp;
2826 }
2827 }
2828
2829
2830 /**
2831 * wpa_tdls_deinit - Deinitialize driver interface parameters for TDLS
2832 *
2833 * This function is called to recover driver interface parameters for TDLS
2834 * and frees resources allocated for it.
2835 */
wpa_tdls_deinit(struct wpa_sm * sm)2836 void wpa_tdls_deinit(struct wpa_sm *sm)
2837 {
2838 if (sm == NULL)
2839 return;
2840
2841 if (sm->l2_tdls)
2842 l2_packet_deinit(sm->l2_tdls);
2843 sm->l2_tdls = NULL;
2844
2845 wpa_tdls_remove_peers(sm);
2846 }
2847
2848
wpa_tdls_assoc(struct wpa_sm * sm)2849 void wpa_tdls_assoc(struct wpa_sm *sm)
2850 {
2851 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on association");
2852 wpa_tdls_remove_peers(sm);
2853 }
2854
2855
wpa_tdls_disassoc(struct wpa_sm * sm)2856 void wpa_tdls_disassoc(struct wpa_sm *sm)
2857 {
2858 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on disassociation");
2859 wpa_tdls_remove_peers(sm);
2860 }
2861
2862
wpa_tdls_prohibited(struct ieee802_11_elems * elems)2863 static int wpa_tdls_prohibited(struct ieee802_11_elems *elems)
2864 {
2865 /* bit 38 - TDLS Prohibited */
2866 return !!(elems->ext_capab[2 + 4] & 0x40);
2867 }
2868
2869
wpa_tdls_chan_switch_prohibited(struct ieee802_11_elems * elems)2870 static int wpa_tdls_chan_switch_prohibited(struct ieee802_11_elems *elems)
2871 {
2872 /* bit 39 - TDLS Channel Switch Prohibited */
2873 return !!(elems->ext_capab[2 + 4] & 0x80);
2874 }
2875
2876
wpa_tdls_ap_ies(struct wpa_sm * sm,const u8 * ies,size_t len)2877 void wpa_tdls_ap_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2878 {
2879 struct ieee802_11_elems elems;
2880
2881 sm->tdls_prohibited = 0;
2882 sm->tdls_chan_switch_prohibited = 0;
2883
2884 if (ies == NULL ||
2885 ieee802_11_parse_elems(ies, len, &elems, 0) == ParseFailed ||
2886 elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5)
2887 return;
2888
2889 sm->tdls_prohibited = wpa_tdls_prohibited(&elems);
2890 wpa_printf(MSG_DEBUG, "TDLS: TDLS is %s in the target BSS",
2891 sm->tdls_prohibited ? "prohibited" : "allowed");
2892 sm->tdls_chan_switch_prohibited =
2893 wpa_tdls_chan_switch_prohibited(&elems);
2894 wpa_printf(MSG_DEBUG, "TDLS: TDLS channel switch %s in the target BSS",
2895 sm->tdls_chan_switch_prohibited ? "prohibited" : "allowed");
2896 }
2897
2898
wpa_tdls_assoc_resp_ies(struct wpa_sm * sm,const u8 * ies,size_t len)2899 void wpa_tdls_assoc_resp_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2900 {
2901 struct ieee802_11_elems elems;
2902
2903 if (ies == NULL ||
2904 ieee802_11_parse_elems(ies, len, &elems, 0) == ParseFailed ||
2905 elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5)
2906 return;
2907
2908 if (!sm->tdls_prohibited && wpa_tdls_prohibited(&elems)) {
2909 wpa_printf(MSG_DEBUG, "TDLS: TDLS prohibited based on "
2910 "(Re)Association Response IEs");
2911 sm->tdls_prohibited = 1;
2912 }
2913
2914 if (!sm->tdls_chan_switch_prohibited &&
2915 wpa_tdls_chan_switch_prohibited(&elems)) {
2916 wpa_printf(MSG_DEBUG,
2917 "TDLS: TDLS channel switch prohibited based on (Re)Association Response IEs");
2918 sm->tdls_chan_switch_prohibited = 1;
2919 }
2920 }
2921
2922
wpa_tdls_enable(struct wpa_sm * sm,int enabled)2923 void wpa_tdls_enable(struct wpa_sm *sm, int enabled)
2924 {
2925 wpa_printf(MSG_DEBUG, "TDLS: %s", enabled ? "enabled" : "disabled");
2926 sm->tdls_disabled = !enabled;
2927 }
2928
2929
wpa_tdls_is_external_setup(struct wpa_sm * sm)2930 int wpa_tdls_is_external_setup(struct wpa_sm *sm)
2931 {
2932 return sm->tdls_external_setup;
2933 }
2934
2935
wpa_tdls_enable_chan_switch(struct wpa_sm * sm,const u8 * addr,u8 oper_class,struct hostapd_freq_params * freq_params)2936 int wpa_tdls_enable_chan_switch(struct wpa_sm *sm, const u8 *addr,
2937 u8 oper_class,
2938 struct hostapd_freq_params *freq_params)
2939 {
2940 struct wpa_tdls_peer *peer;
2941 int ret;
2942
2943 if (sm->tdls_disabled || !sm->tdls_supported)
2944 return -1;
2945
2946 if (!sm->tdls_chan_switch) {
2947 wpa_printf(MSG_DEBUG,
2948 "TDLS: Channel switching not supported by the driver");
2949 return -1;
2950 }
2951
2952 if (sm->tdls_chan_switch_prohibited) {
2953 wpa_printf(MSG_DEBUG,
2954 "TDLS: Channel switching is prohibited in this BSS - reject request to switch channel");
2955 return -1;
2956 }
2957
2958 for (peer = sm->tdls; peer; peer = peer->next) {
2959 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
2960 break;
2961 }
2962
2963 if (peer == NULL || !peer->tpk_success) {
2964 wpa_printf(MSG_ERROR, "TDLS: Peer " MACSTR
2965 " not found for channel switching", MAC2STR(addr));
2966 return -1;
2967 }
2968
2969 if (peer->chan_switch_enabled) {
2970 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR
2971 " already has channel switching enabled",
2972 MAC2STR(addr));
2973 return 0;
2974 }
2975
2976 ret = wpa_sm_tdls_enable_channel_switch(sm, peer->addr,
2977 oper_class, freq_params);
2978 if (!ret)
2979 peer->chan_switch_enabled = 1;
2980
2981 return ret;
2982 }
2983
2984
wpa_tdls_disable_chan_switch(struct wpa_sm * sm,const u8 * addr)2985 int wpa_tdls_disable_chan_switch(struct wpa_sm *sm, const u8 *addr)
2986 {
2987 struct wpa_tdls_peer *peer;
2988
2989 if (sm->tdls_disabled || !sm->tdls_supported)
2990 return -1;
2991
2992 for (peer = sm->tdls; peer; peer = peer->next) {
2993 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
2994 break;
2995 }
2996
2997 if (!peer || !peer->chan_switch_enabled) {
2998 wpa_printf(MSG_ERROR, "TDLS: Channel switching not enabled for "
2999 MACSTR, MAC2STR(addr));
3000 return -1;
3001 }
3002
3003 /* ignore the return value */
3004 wpa_sm_tdls_disable_channel_switch(sm, peer->addr);
3005
3006 peer->chan_switch_enabled = 0;
3007 return 0;
3008 }
3009