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 tk_set; /* TPK-TK configured to the driver */
116 int tpk_success;
117 int tpk_in_progress;
118
119 struct tpk_timer {
120 u8 dest[ETH_ALEN];
121 int count; /* Retry Count */
122 int timer; /* Timeout in milliseconds */
123 u8 action_code; /* TDLS frame type */
124 u8 dialog_token;
125 u16 status_code;
126 u32 peer_capab;
127 int buf_len; /* length of TPK message for retransmission */
128 u8 *buf; /* buffer for TPK message */
129 } sm_tmr;
130
131 u16 capability;
132
133 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
134 size_t supp_rates_len;
135
136 struct ieee80211_ht_capabilities *ht_capabilities;
137 struct ieee80211_vht_capabilities *vht_capabilities;
138
139 u8 qos_info;
140
141 u16 aid;
142
143 u8 *ext_capab;
144 size_t ext_capab_len;
145
146 u8 *supp_channels;
147 size_t supp_channels_len;
148
149 u8 *supp_oper_classes;
150 size_t supp_oper_classes_len;
151
152 u8 wmm_capable;
153
154 /* channel switch currently enabled */
155 int chan_switch_enabled;
156 };
157
158
wpa_tdls_get_privacy(struct wpa_sm * sm)159 static int wpa_tdls_get_privacy(struct wpa_sm *sm)
160 {
161 /*
162 * Get info needed from supplicant to check if the current BSS supports
163 * security. Other than OPEN mode, rest are considered secured
164 * WEP/WPA/WPA2 hence TDLS frames are processed for TPK handshake.
165 */
166 return sm->pairwise_cipher != WPA_CIPHER_NONE;
167 }
168
169
wpa_add_ie(u8 * pos,const u8 * ie,size_t ie_len)170 static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len)
171 {
172 os_memcpy(pos, ie, ie_len);
173 return pos + ie_len;
174 }
175
176
wpa_tdls_del_key(struct wpa_sm * sm,struct wpa_tdls_peer * peer)177 static int wpa_tdls_del_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
178 {
179 if (wpa_sm_set_key(sm, WPA_ALG_NONE, peer->addr,
180 0, 0, NULL, 0, NULL, 0) < 0) {
181 wpa_printf(MSG_WARNING, "TDLS: Failed to delete TPK-TK from "
182 "the driver");
183 return -1;
184 }
185
186 return 0;
187 }
188
189
wpa_tdls_set_key(struct wpa_sm * sm,struct wpa_tdls_peer * peer)190 static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
191 {
192 u8 key_len;
193 u8 rsc[6];
194 enum wpa_alg alg;
195
196 if (peer->tk_set) {
197 /*
198 * This same TPK-TK has already been configured to the driver
199 * and this new configuration attempt (likely due to an
200 * unexpected retransmitted frame) would result in clearing
201 * the TX/RX sequence number which can break security, so must
202 * not allow that to happen.
203 */
204 wpa_printf(MSG_INFO, "TDLS: TPK-TK for the peer " MACSTR
205 " has already been configured to the driver - do not reconfigure",
206 MAC2STR(peer->addr));
207 return -1;
208 }
209
210 os_memset(rsc, 0, 6);
211
212 switch (peer->cipher) {
213 case WPA_CIPHER_CCMP:
214 alg = WPA_ALG_CCMP;
215 key_len = 16;
216 break;
217 case WPA_CIPHER_NONE:
218 wpa_printf(MSG_DEBUG, "TDLS: Pairwise Cipher Suite: "
219 "NONE - do not use pairwise keys");
220 return -1;
221 default:
222 wpa_printf(MSG_WARNING, "TDLS: Unsupported pairwise cipher %d",
223 sm->pairwise_cipher);
224 return -1;
225 }
226
227 wpa_printf(MSG_DEBUG, "TDLS: Configure pairwise key for peer " MACSTR,
228 MAC2STR(peer->addr));
229 if (wpa_sm_set_key(sm, alg, peer->addr, -1, 1,
230 rsc, sizeof(rsc), peer->tpk.tk, key_len) < 0) {
231 wpa_printf(MSG_WARNING, "TDLS: Failed to set TPK to the "
232 "driver");
233 return -1;
234 }
235 peer->tk_set = 1;
236 return 0;
237 }
238
239
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)240 static int wpa_tdls_send_tpk_msg(struct wpa_sm *sm, const u8 *dst,
241 u8 action_code, u8 dialog_token,
242 u16 status_code, u32 peer_capab,
243 int initiator, const u8 *buf, size_t len)
244 {
245 return wpa_sm_send_tdls_mgmt(sm, dst, action_code, dialog_token,
246 status_code, peer_capab, initiator, buf,
247 len);
248 }
249
250
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)251 static int wpa_tdls_tpk_send(struct wpa_sm *sm, const u8 *dest, u8 action_code,
252 u8 dialog_token, u16 status_code, u32 peer_capab,
253 int initiator, const u8 *msg, size_t msg_len)
254 {
255 struct wpa_tdls_peer *peer;
256
257 wpa_printf(MSG_DEBUG, "TDLS: TPK send dest=" MACSTR " action_code=%u "
258 "dialog_token=%u status_code=%u peer_capab=%u initiator=%d "
259 "msg_len=%u",
260 MAC2STR(dest), action_code, dialog_token, status_code,
261 peer_capab, initiator, (unsigned int) msg_len);
262
263 if (wpa_tdls_send_tpk_msg(sm, dest, action_code, dialog_token,
264 status_code, peer_capab, initiator, msg,
265 msg_len)) {
266 wpa_printf(MSG_INFO, "TDLS: Failed to send message "
267 "(action_code=%u)", action_code);
268 return -1;
269 }
270
271 if (action_code == WLAN_TDLS_SETUP_CONFIRM ||
272 action_code == WLAN_TDLS_TEARDOWN ||
273 action_code == WLAN_TDLS_DISCOVERY_REQUEST ||
274 action_code == WLAN_TDLS_DISCOVERY_RESPONSE)
275 return 0; /* No retries */
276
277 for (peer = sm->tdls; peer; peer = peer->next) {
278 if (os_memcmp(peer->addr, dest, ETH_ALEN) == 0)
279 break;
280 }
281
282 if (peer == NULL) {
283 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
284 "retry " MACSTR, MAC2STR(dest));
285 return 0;
286 }
287
288 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
289
290 if (action_code == WLAN_TDLS_SETUP_RESPONSE) {
291 peer->sm_tmr.count = TPK_M2_RETRY_COUNT;
292 peer->sm_tmr.timer = TPK_M2_TIMEOUT;
293 } else {
294 peer->sm_tmr.count = TPK_M1_RETRY_COUNT;
295 peer->sm_tmr.timer = TPK_M1_TIMEOUT;
296 }
297
298 /* Copy message to resend on timeout */
299 os_memcpy(peer->sm_tmr.dest, dest, ETH_ALEN);
300 peer->sm_tmr.action_code = action_code;
301 peer->sm_tmr.dialog_token = dialog_token;
302 peer->sm_tmr.status_code = status_code;
303 peer->sm_tmr.peer_capab = peer_capab;
304 peer->sm_tmr.buf_len = msg_len;
305 os_free(peer->sm_tmr.buf);
306 peer->sm_tmr.buf = os_malloc(msg_len);
307 if (peer->sm_tmr.buf == NULL)
308 return -1;
309 os_memcpy(peer->sm_tmr.buf, msg, msg_len);
310
311 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout registered "
312 "(action_code=%u)", action_code);
313 eloop_register_timeout(peer->sm_tmr.timer / 1000,
314 (peer->sm_tmr.timer % 1000) * 1000,
315 wpa_tdls_tpk_retry_timeout, sm, peer);
316 return 0;
317 }
318
319
wpa_tdls_do_teardown(struct wpa_sm * sm,struct wpa_tdls_peer * peer,u16 reason_code)320 static int wpa_tdls_do_teardown(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
321 u16 reason_code)
322 {
323 int ret;
324
325 ret = wpa_tdls_send_teardown(sm, peer->addr, reason_code);
326 /* disable the link after teardown was sent */
327 wpa_tdls_disable_peer_link(sm, peer);
328
329 return ret;
330 }
331
332
wpa_tdls_tpk_retry_timeout(void * eloop_ctx,void * timeout_ctx)333 static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx)
334 {
335
336 struct wpa_sm *sm = eloop_ctx;
337 struct wpa_tdls_peer *peer = timeout_ctx;
338
339 if (peer->sm_tmr.count) {
340 peer->sm_tmr.count--;
341
342 wpa_printf(MSG_INFO, "TDLS: Retrying sending of message "
343 "(action_code=%u)",
344 peer->sm_tmr.action_code);
345
346 if (peer->sm_tmr.buf == NULL) {
347 wpa_printf(MSG_INFO, "TDLS: No retry buffer available "
348 "for action_code=%u",
349 peer->sm_tmr.action_code);
350 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm,
351 peer);
352 return;
353 }
354
355 /* resend TPK Handshake Message to Peer */
356 if (wpa_tdls_send_tpk_msg(sm, peer->sm_tmr.dest,
357 peer->sm_tmr.action_code,
358 peer->sm_tmr.dialog_token,
359 peer->sm_tmr.status_code,
360 peer->sm_tmr.peer_capab,
361 peer->initiator,
362 peer->sm_tmr.buf,
363 peer->sm_tmr.buf_len)) {
364 wpa_printf(MSG_INFO, "TDLS: Failed to retry "
365 "transmission");
366 }
367
368 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
369 eloop_register_timeout(peer->sm_tmr.timer / 1000,
370 (peer->sm_tmr.timer % 1000) * 1000,
371 wpa_tdls_tpk_retry_timeout, sm, peer);
372 } else {
373 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
374
375 wpa_printf(MSG_DEBUG, "TDLS: Sending Teardown Request");
376 wpa_tdls_do_teardown(sm, peer,
377 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
378 }
379 }
380
381
wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm * sm,struct wpa_tdls_peer * peer,u8 action_code)382 static void wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm *sm,
383 struct wpa_tdls_peer *peer,
384 u8 action_code)
385 {
386 if (action_code == peer->sm_tmr.action_code) {
387 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout cancelled for "
388 "action_code=%u", action_code);
389
390 /* Cancel Timeout registered */
391 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
392
393 /* free all resources meant for retry */
394 os_free(peer->sm_tmr.buf);
395 peer->sm_tmr.buf = NULL;
396
397 peer->sm_tmr.count = 0;
398 peer->sm_tmr.timer = 0;
399 peer->sm_tmr.buf_len = 0;
400 peer->sm_tmr.action_code = 0xff;
401 } else {
402 wpa_printf(MSG_INFO, "TDLS: Error in cancelling retry timeout "
403 "(Unknown action_code=%u)", action_code);
404 }
405 }
406
407
wpa_tdls_generate_tpk(struct wpa_tdls_peer * peer,const u8 * own_addr,const u8 * bssid)408 static void wpa_tdls_generate_tpk(struct wpa_tdls_peer *peer,
409 const u8 *own_addr, const u8 *bssid)
410 {
411 u8 key_input[SHA256_MAC_LEN];
412 const u8 *nonce[2];
413 size_t len[2];
414 u8 data[3 * ETH_ALEN];
415
416 /* IEEE Std 802.11z-2010 8.5.9.1:
417 * TPK-Key-Input = SHA-256(min(SNonce, ANonce) || max(SNonce, ANonce))
418 */
419 len[0] = WPA_NONCE_LEN;
420 len[1] = WPA_NONCE_LEN;
421 if (os_memcmp(peer->inonce, peer->rnonce, WPA_NONCE_LEN) < 0) {
422 nonce[0] = peer->inonce;
423 nonce[1] = peer->rnonce;
424 } else {
425 nonce[0] = peer->rnonce;
426 nonce[1] = peer->inonce;
427 }
428 wpa_hexdump(MSG_DEBUG, "TDLS: min(Nonce)", nonce[0], WPA_NONCE_LEN);
429 wpa_hexdump(MSG_DEBUG, "TDLS: max(Nonce)", nonce[1], WPA_NONCE_LEN);
430 sha256_vector(2, nonce, len, key_input);
431 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-Key-Input",
432 key_input, SHA256_MAC_LEN);
433
434 /*
435 * TPK-Key-Data = KDF-N_KEY(TPK-Key-Input, "TDLS PMK",
436 * min(MAC_I, MAC_R) || max(MAC_I, MAC_R) || BSSID || N_KEY)
437 * TODO: is N_KEY really included in KDF Context and if so, in which
438 * presentation format (little endian 16-bit?) is it used? It gets
439 * added by the KDF anyway..
440 */
441
442 if (os_memcmp(own_addr, peer->addr, ETH_ALEN) < 0) {
443 os_memcpy(data, own_addr, ETH_ALEN);
444 os_memcpy(data + ETH_ALEN, peer->addr, ETH_ALEN);
445 } else {
446 os_memcpy(data, peer->addr, ETH_ALEN);
447 os_memcpy(data + ETH_ALEN, own_addr, ETH_ALEN);
448 }
449 os_memcpy(data + 2 * ETH_ALEN, bssid, ETH_ALEN);
450 wpa_hexdump(MSG_DEBUG, "TDLS: KDF Context", data, sizeof(data));
451
452 sha256_prf(key_input, SHA256_MAC_LEN, "TDLS PMK", data, sizeof(data),
453 (u8 *) &peer->tpk, sizeof(peer->tpk));
454 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-KCK",
455 peer->tpk.kck, sizeof(peer->tpk.kck));
456 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-TK",
457 peer->tpk.tk, sizeof(peer->tpk.tk));
458 peer->tpk_set = 1;
459 }
460
461
462 /**
463 * wpa_tdls_ftie_mic - Calculate TDLS FTIE MIC
464 * @kck: TPK-KCK
465 * @lnkid: Pointer to the beginning of Link Identifier IE
466 * @rsnie: Pointer to the beginning of RSN IE used for handshake
467 * @timeoutie: Pointer to the beginning of Timeout IE used for handshake
468 * @ftie: Pointer to the beginning of FT IE
469 * @mic: Pointer for writing MIC
470 *
471 * Calculate MIC for TDLS frame.
472 */
wpa_tdls_ftie_mic(const u8 * kck,u8 trans_seq,const u8 * lnkid,const u8 * rsnie,const u8 * timeoutie,const u8 * ftie,u8 * mic)473 static int wpa_tdls_ftie_mic(const u8 *kck, u8 trans_seq, const u8 *lnkid,
474 const u8 *rsnie, const u8 *timeoutie,
475 const u8 *ftie, u8 *mic)
476 {
477 u8 *buf, *pos;
478 struct wpa_tdls_ftie *_ftie;
479 const struct wpa_tdls_lnkid *_lnkid;
480 int ret;
481 int len = 2 * ETH_ALEN + 1 + 2 + lnkid[1] + 2 + rsnie[1] +
482 2 + timeoutie[1] + 2 + ftie[1];
483 buf = os_zalloc(len);
484 if (!buf) {
485 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
486 return -1;
487 }
488
489 pos = buf;
490 _lnkid = (const struct wpa_tdls_lnkid *) lnkid;
491 /* 1) TDLS initiator STA MAC address */
492 os_memcpy(pos, _lnkid->init_sta, ETH_ALEN);
493 pos += ETH_ALEN;
494 /* 2) TDLS responder STA MAC address */
495 os_memcpy(pos, _lnkid->resp_sta, ETH_ALEN);
496 pos += ETH_ALEN;
497 /* 3) Transaction Sequence number */
498 *pos++ = trans_seq;
499 /* 4) Link Identifier IE */
500 os_memcpy(pos, lnkid, 2 + lnkid[1]);
501 pos += 2 + lnkid[1];
502 /* 5) RSN IE */
503 os_memcpy(pos, rsnie, 2 + rsnie[1]);
504 pos += 2 + rsnie[1];
505 /* 6) Timeout Interval IE */
506 os_memcpy(pos, timeoutie, 2 + timeoutie[1]);
507 pos += 2 + timeoutie[1];
508 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
509 os_memcpy(pos, ftie, 2 + ftie[1]);
510 _ftie = (struct wpa_tdls_ftie *) pos;
511 os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
512 pos += 2 + ftie[1];
513
514 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
515 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
516 ret = omac1_aes_128(kck, buf, pos - buf, mic);
517 os_free(buf);
518 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
519 return ret;
520 }
521
522
523 /**
524 * wpa_tdls_key_mic_teardown - Calculate TDLS FTIE MIC for Teardown frame
525 * @kck: TPK-KCK
526 * @trans_seq: Transaction Sequence Number (4 - Teardown)
527 * @rcode: Reason code for Teardown
528 * @dtoken: Dialog Token used for that particular link
529 * @lnkid: Pointer to the beginning of Link Identifier IE
530 * @ftie: Pointer to the beginning of FT IE
531 * @mic: Pointer for writing MIC
532 *
533 * Calculate MIC for TDLS frame.
534 */
wpa_tdls_key_mic_teardown(const u8 * kck,u8 trans_seq,u16 rcode,u8 dtoken,const u8 * lnkid,const u8 * ftie,u8 * mic)535 static int wpa_tdls_key_mic_teardown(const u8 *kck, u8 trans_seq, u16 rcode,
536 u8 dtoken, const u8 *lnkid,
537 const u8 *ftie, u8 *mic)
538 {
539 u8 *buf, *pos;
540 struct wpa_tdls_ftie *_ftie;
541 int ret;
542 int len;
543
544 if (lnkid == NULL)
545 return -1;
546
547 len = 2 + lnkid[1] + sizeof(rcode) + sizeof(dtoken) +
548 sizeof(trans_seq) + 2 + ftie[1];
549
550 buf = os_zalloc(len);
551 if (!buf) {
552 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
553 return -1;
554 }
555
556 pos = buf;
557 /* 1) Link Identifier IE */
558 os_memcpy(pos, lnkid, 2 + lnkid[1]);
559 pos += 2 + lnkid[1];
560 /* 2) Reason Code */
561 WPA_PUT_LE16(pos, rcode);
562 pos += sizeof(rcode);
563 /* 3) Dialog token */
564 *pos++ = dtoken;
565 /* 4) Transaction Sequence number */
566 *pos++ = trans_seq;
567 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
568 os_memcpy(pos, ftie, 2 + ftie[1]);
569 _ftie = (struct wpa_tdls_ftie *) pos;
570 os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
571 pos += 2 + ftie[1];
572
573 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
574 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
575 ret = omac1_aes_128(kck, buf, pos - buf, mic);
576 os_free(buf);
577 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
578 return ret;
579 }
580
581
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)582 static int wpa_supplicant_verify_tdls_mic(u8 trans_seq,
583 struct wpa_tdls_peer *peer,
584 const u8 *lnkid, const u8 *timeoutie,
585 const struct wpa_tdls_ftie *ftie)
586 {
587 u8 mic[16];
588
589 if (peer->tpk_set) {
590 wpa_tdls_ftie_mic(peer->tpk.kck, trans_seq, lnkid,
591 peer->rsnie_p, timeoutie, (u8 *) ftie,
592 mic);
593 if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
594 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in FTIE - "
595 "dropping packet");
596 wpa_hexdump(MSG_DEBUG, "TDLS: Received MIC",
597 ftie->mic, 16);
598 wpa_hexdump(MSG_DEBUG, "TDLS: Calculated MIC",
599 mic, 16);
600 return -1;
601 }
602 } else {
603 wpa_printf(MSG_WARNING, "TDLS: Could not verify TDLS MIC, "
604 "TPK not set - dropping packet");
605 return -1;
606 }
607 return 0;
608 }
609
610
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)611 static int wpa_supplicant_verify_tdls_mic_teardown(
612 u8 trans_seq, u16 rcode, u8 dtoken, struct wpa_tdls_peer *peer,
613 const u8 *lnkid, const struct wpa_tdls_ftie *ftie)
614 {
615 u8 mic[16];
616
617 if (peer->tpk_set) {
618 wpa_tdls_key_mic_teardown(peer->tpk.kck, trans_seq, rcode,
619 dtoken, lnkid, (u8 *) ftie, mic);
620 if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
621 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in Teardown - "
622 "dropping packet");
623 return -1;
624 }
625 } else {
626 wpa_printf(MSG_INFO, "TDLS: Could not verify TDLS Teardown "
627 "MIC, TPK not set - dropping packet");
628 return -1;
629 }
630 return 0;
631 }
632
633
wpa_tdls_tpk_timeout(void * eloop_ctx,void * timeout_ctx)634 static void wpa_tdls_tpk_timeout(void *eloop_ctx, void *timeout_ctx)
635 {
636 struct wpa_sm *sm = eloop_ctx;
637 struct wpa_tdls_peer *peer = timeout_ctx;
638
639 /*
640 * On TPK lifetime expiration, we have an option of either tearing down
641 * the direct link or trying to re-initiate it. The selection of what
642 * to do is not strictly speaking controlled by our role in the expired
643 * link, but for now, use that to select whether to renew or tear down
644 * the link.
645 */
646
647 if (peer->initiator) {
648 u8 addr[ETH_ALEN];
649
650 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
651 " - try to renew", MAC2STR(peer->addr));
652 /* cache the peer address before do_teardown */
653 os_memcpy(addr, peer->addr, ETH_ALEN);
654 wpa_tdls_do_teardown(sm, peer,
655 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
656 wpa_tdls_start(sm, addr);
657 } else {
658 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
659 " - tear down", MAC2STR(peer->addr));
660 wpa_tdls_do_teardown(sm, peer,
661 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
662 }
663 }
664
665
wpa_tdls_peer_remove_from_list(struct wpa_sm * sm,struct wpa_tdls_peer * peer)666 static void wpa_tdls_peer_remove_from_list(struct wpa_sm *sm,
667 struct wpa_tdls_peer *peer)
668 {
669 struct wpa_tdls_peer *cur, *prev;
670
671 cur = sm->tdls;
672 prev = NULL;
673 while (cur && cur != peer) {
674 prev = cur;
675 cur = cur->next;
676 }
677
678 if (cur != peer) {
679 wpa_printf(MSG_ERROR, "TDLS: Could not find peer " MACSTR
680 " to remove it from the list",
681 MAC2STR(peer->addr));
682 return;
683 }
684
685 if (prev)
686 prev->next = peer->next;
687 else
688 sm->tdls = peer->next;
689 }
690
691
wpa_tdls_peer_clear(struct wpa_sm * sm,struct wpa_tdls_peer * peer)692 static void wpa_tdls_peer_clear(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
693 {
694 wpa_printf(MSG_DEBUG, "TDLS: Clear state for peer " MACSTR,
695 MAC2STR(peer->addr));
696 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
697 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
698 peer->reconfig_key = 0;
699 peer->initiator = 0;
700 peer->tpk_in_progress = 0;
701 os_free(peer->sm_tmr.buf);
702 peer->sm_tmr.buf = NULL;
703 os_free(peer->ht_capabilities);
704 peer->ht_capabilities = NULL;
705 os_free(peer->vht_capabilities);
706 peer->vht_capabilities = NULL;
707 os_free(peer->ext_capab);
708 peer->ext_capab = NULL;
709 os_free(peer->supp_channels);
710 peer->supp_channels = NULL;
711 os_free(peer->supp_oper_classes);
712 peer->supp_oper_classes = NULL;
713 peer->rsnie_i_len = peer->rsnie_p_len = 0;
714 peer->cipher = 0;
715 peer->qos_info = 0;
716 peer->wmm_capable = 0;
717 peer->tk_set = peer->tpk_set = peer->tpk_success = 0;
718 peer->chan_switch_enabled = 0;
719 os_memset(&peer->tpk, 0, sizeof(peer->tpk));
720 os_memset(peer->inonce, 0, WPA_NONCE_LEN);
721 os_memset(peer->rnonce, 0, WPA_NONCE_LEN);
722 }
723
724
wpa_tdls_peer_free(struct wpa_sm * sm,struct wpa_tdls_peer * peer)725 static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
726 {
727 wpa_tdls_peer_clear(sm, peer);
728 wpa_tdls_peer_remove_from_list(sm, peer);
729 os_free(peer);
730 }
731
732
wpa_tdls_linkid(struct wpa_sm * sm,struct wpa_tdls_peer * peer,struct wpa_tdls_lnkid * lnkid)733 static void wpa_tdls_linkid(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
734 struct wpa_tdls_lnkid *lnkid)
735 {
736 lnkid->ie_type = WLAN_EID_LINK_ID;
737 lnkid->ie_len = 3 * ETH_ALEN;
738 os_memcpy(lnkid->bssid, sm->bssid, ETH_ALEN);
739 if (peer->initiator) {
740 os_memcpy(lnkid->init_sta, sm->own_addr, ETH_ALEN);
741 os_memcpy(lnkid->resp_sta, peer->addr, ETH_ALEN);
742 } else {
743 os_memcpy(lnkid->init_sta, peer->addr, ETH_ALEN);
744 os_memcpy(lnkid->resp_sta, sm->own_addr, ETH_ALEN);
745 }
746 }
747
748
wpa_tdls_send_teardown(struct wpa_sm * sm,const u8 * addr,u16 reason_code)749 static int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr,
750 u16 reason_code)
751 {
752 struct wpa_tdls_peer *peer;
753 struct wpa_tdls_ftie *ftie;
754 struct wpa_tdls_lnkid lnkid;
755 u8 dialog_token;
756 u8 *rbuf, *pos;
757 int ielen;
758
759 if (sm->tdls_disabled || !sm->tdls_supported)
760 return -1;
761
762 /* Find the node and free from the list */
763 for (peer = sm->tdls; peer; peer = peer->next) {
764 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
765 break;
766 }
767
768 if (peer == NULL) {
769 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
770 "Teardown " MACSTR, MAC2STR(addr));
771 return 0;
772 }
773
774 /* Cancel active channel switch before teardown */
775 if (peer->chan_switch_enabled) {
776 wpa_printf(MSG_DEBUG, "TDLS: First returning link with " MACSTR
777 " to base channel", MAC2STR(addr));
778 wpa_sm_tdls_disable_channel_switch(sm, peer->addr);
779 }
780
781 dialog_token = peer->dtoken;
782
783 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown for " MACSTR,
784 MAC2STR(addr));
785
786 ielen = 0;
787 if (wpa_tdls_get_privacy(sm) && peer->tpk_set && peer->tpk_success) {
788 /* To add FTIE for Teardown request and compute MIC */
789 ielen += sizeof(*ftie);
790 #ifdef CONFIG_TDLS_TESTING
791 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
792 ielen += 170;
793 #endif /* CONFIG_TDLS_TESTING */
794 }
795
796 rbuf = os_zalloc(ielen + 1);
797 if (rbuf == NULL)
798 return -1;
799 pos = rbuf;
800
801 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success)
802 goto skip_ies;
803
804 ftie = (struct wpa_tdls_ftie *) pos;
805 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
806 /* Using the recent nonce which should be for CONFIRM frame */
807 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
808 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
809 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
810 pos = (u8 *) (ftie + 1);
811 #ifdef CONFIG_TDLS_TESTING
812 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
813 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
814 "FTIE");
815 ftie->ie_len += 170;
816 *pos++ = 255; /* FTIE subelem */
817 *pos++ = 168; /* FTIE subelem length */
818 pos += 168;
819 }
820 #endif /* CONFIG_TDLS_TESTING */
821 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TDLS Teardown handshake",
822 (u8 *) ftie, pos - (u8 *) ftie);
823
824 /* compute MIC before sending */
825 wpa_tdls_linkid(sm, peer, &lnkid);
826 wpa_tdls_key_mic_teardown(peer->tpk.kck, 4, reason_code,
827 dialog_token, (u8 *) &lnkid, (u8 *) ftie,
828 ftie->mic);
829
830 skip_ies:
831 /* TODO: register for a Timeout handler, if Teardown is not received at
832 * the other end, then try again another time */
833
834 /* request driver to send Teardown using this FTIE */
835 wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_TEARDOWN, 0,
836 reason_code, 0, peer->initiator, rbuf, pos - rbuf);
837 os_free(rbuf);
838
839 return 0;
840 }
841
842
wpa_tdls_teardown_link(struct wpa_sm * sm,const u8 * addr,u16 reason_code)843 int wpa_tdls_teardown_link(struct wpa_sm *sm, const u8 *addr, u16 reason_code)
844 {
845 struct wpa_tdls_peer *peer;
846
847 if (sm->tdls_disabled || !sm->tdls_supported)
848 return -1;
849
850 for (peer = sm->tdls; peer; peer = peer->next) {
851 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
852 break;
853 }
854
855 if (peer == NULL) {
856 wpa_printf(MSG_DEBUG, "TDLS: Could not find peer " MACSTR
857 " for link Teardown", MAC2STR(addr));
858 return -1;
859 }
860
861 if (!peer->tpk_success) {
862 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR
863 " not connected - cannot Teardown link", MAC2STR(addr));
864 return -1;
865 }
866
867 return wpa_tdls_do_teardown(sm, peer, reason_code);
868 }
869
870
wpa_tdls_disable_peer_link(struct wpa_sm * sm,struct wpa_tdls_peer * peer)871 static void wpa_tdls_disable_peer_link(struct wpa_sm *sm,
872 struct wpa_tdls_peer *peer)
873 {
874 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
875 wpa_tdls_peer_free(sm, peer);
876 }
877
878
wpa_tdls_disable_unreachable_link(struct wpa_sm * sm,const u8 * addr)879 void wpa_tdls_disable_unreachable_link(struct wpa_sm *sm, const u8 *addr)
880 {
881 struct wpa_tdls_peer *peer;
882
883 for (peer = sm->tdls; peer; peer = peer->next) {
884 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
885 break;
886 }
887
888 if (!peer || !peer->tpk_success) {
889 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR
890 " not connected - cannot teardown unreachable link",
891 MAC2STR(addr));
892 return;
893 }
894
895 if (wpa_tdls_is_external_setup(sm)) {
896 /*
897 * Get us on the base channel, disable the link, send a
898 * teardown packet through the AP, and then reset link data.
899 */
900 if (peer->chan_switch_enabled)
901 wpa_sm_tdls_disable_channel_switch(sm, peer->addr);
902 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, addr);
903 wpa_tdls_send_teardown(sm, addr,
904 WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE);
905 wpa_tdls_peer_free(sm, peer);
906 } else {
907 wpa_tdls_disable_peer_link(sm, peer);
908 }
909 }
910
911
wpa_tdls_get_link_status(struct wpa_sm * sm,const u8 * addr)912 const char * wpa_tdls_get_link_status(struct wpa_sm *sm, const u8 *addr)
913 {
914 struct wpa_tdls_peer *peer;
915
916 if (sm->tdls_disabled || !sm->tdls_supported)
917 return "disabled";
918
919 for (peer = sm->tdls; peer; peer = peer->next) {
920 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
921 break;
922 }
923
924 if (peer == NULL)
925 return "peer does not exist";
926
927 if (!peer->tpk_success)
928 return "peer not connected";
929
930 return "connected";
931 }
932
933
wpa_tdls_recv_teardown(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)934 static int wpa_tdls_recv_teardown(struct wpa_sm *sm, const u8 *src_addr,
935 const u8 *buf, size_t len)
936 {
937 struct wpa_tdls_peer *peer = NULL;
938 struct wpa_tdls_ftie *ftie;
939 struct wpa_tdls_lnkid *lnkid;
940 struct wpa_eapol_ie_parse kde;
941 u16 reason_code;
942 const u8 *pos;
943 int ielen;
944
945 /* Find the node and free from the list */
946 for (peer = sm->tdls; peer; peer = peer->next) {
947 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
948 break;
949 }
950
951 if (peer == NULL) {
952 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
953 "Teardown " MACSTR, MAC2STR(src_addr));
954 return 0;
955 }
956
957 pos = buf;
958 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
959
960 reason_code = WPA_GET_LE16(pos);
961 pos += 2;
962
963 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown Request from " MACSTR
964 " (reason code %u)", MAC2STR(src_addr), reason_code);
965
966 ielen = len - (pos - buf); /* start of IE in buf */
967
968 /*
969 * Don't reject the message if failing to parse IEs. The IEs we need are
970 * explicitly checked below. Some APs may add arbitrary padding to the
971 * end of short TDLS frames and that would look like invalid IEs.
972 */
973 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0)
974 wpa_printf(MSG_DEBUG,
975 "TDLS: Failed to parse IEs in Teardown - ignore as an interop workaround");
976
977 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
978 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TDLS "
979 "Teardown");
980 return -1;
981 }
982 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
983
984 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success)
985 goto skip_ftie;
986
987 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
988 wpa_printf(MSG_INFO, "TDLS: No FTIE in TDLS Teardown");
989 return -1;
990 }
991
992 ftie = (struct wpa_tdls_ftie *) kde.ftie;
993
994 /* Process MIC check to see if TDLS Teardown is right */
995 if (wpa_supplicant_verify_tdls_mic_teardown(4, reason_code,
996 peer->dtoken, peer,
997 (u8 *) lnkid, ftie) < 0) {
998 wpa_printf(MSG_DEBUG, "TDLS: MIC failure for TDLS "
999 "Teardown Request from " MACSTR, MAC2STR(src_addr));
1000 return -1;
1001 }
1002
1003 skip_ftie:
1004 /*
1005 * Request the driver to disable the direct link and clear associated
1006 * keys.
1007 */
1008 wpa_tdls_disable_peer_link(sm, peer);
1009 return 0;
1010 }
1011
1012
1013 /**
1014 * wpa_tdls_send_error - To send suitable TDLS status response with
1015 * appropriate status code mentioning reason for error/failure.
1016 * @dst - MAC addr of Peer station
1017 * @tdls_action - TDLS frame type for which error code is sent
1018 * @initiator - was this end the initiator of the connection
1019 * @status - status code mentioning reason
1020 */
1021
wpa_tdls_send_error(struct wpa_sm * sm,const u8 * dst,u8 tdls_action,u8 dialog_token,int initiator,u16 status)1022 static int wpa_tdls_send_error(struct wpa_sm *sm, const u8 *dst,
1023 u8 tdls_action, u8 dialog_token, int initiator,
1024 u16 status)
1025 {
1026 wpa_printf(MSG_DEBUG, "TDLS: Sending error to " MACSTR
1027 " (action=%u status=%u)",
1028 MAC2STR(dst), tdls_action, status);
1029 return wpa_tdls_tpk_send(sm, dst, tdls_action, dialog_token, status,
1030 0, initiator, NULL, 0);
1031 }
1032
1033
1034 static struct wpa_tdls_peer *
wpa_tdls_add_peer(struct wpa_sm * sm,const u8 * addr,int * existing)1035 wpa_tdls_add_peer(struct wpa_sm *sm, const u8 *addr, int *existing)
1036 {
1037 struct wpa_tdls_peer *peer;
1038
1039 if (existing)
1040 *existing = 0;
1041 for (peer = sm->tdls; peer; peer = peer->next) {
1042 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0) {
1043 if (existing)
1044 *existing = 1;
1045 return peer; /* re-use existing entry */
1046 }
1047 }
1048
1049 wpa_printf(MSG_INFO, "TDLS: Creating peer entry for " MACSTR,
1050 MAC2STR(addr));
1051
1052 peer = os_zalloc(sizeof(*peer));
1053 if (peer == NULL)
1054 return NULL;
1055
1056 os_memcpy(peer->addr, addr, ETH_ALEN);
1057 peer->next = sm->tdls;
1058 sm->tdls = peer;
1059
1060 return peer;
1061 }
1062
1063
wpa_tdls_send_tpk_m1(struct wpa_sm * sm,struct wpa_tdls_peer * peer)1064 static int wpa_tdls_send_tpk_m1(struct wpa_sm *sm,
1065 struct wpa_tdls_peer *peer)
1066 {
1067 size_t buf_len;
1068 struct wpa_tdls_timeoutie timeoutie;
1069 u16 rsn_capab;
1070 struct wpa_tdls_ftie *ftie;
1071 u8 *rbuf, *pos, *count_pos;
1072 u16 count;
1073 struct rsn_ie_hdr *hdr;
1074 int status;
1075
1076 if (!wpa_tdls_get_privacy(sm)) {
1077 wpa_printf(MSG_DEBUG, "TDLS: No security used on the link");
1078 peer->rsnie_i_len = 0;
1079 goto skip_rsnie;
1080 }
1081
1082 /*
1083 * TPK Handshake Message 1:
1084 * FTIE: ANonce=0, SNonce=initiator nonce MIC=0, DataKDs=(RSNIE_I,
1085 * Timeout Interval IE))
1086 */
1087
1088 /* Filling RSN IE */
1089 hdr = (struct rsn_ie_hdr *) peer->rsnie_i;
1090 hdr->elem_id = WLAN_EID_RSN;
1091 WPA_PUT_LE16(hdr->version, RSN_VERSION);
1092
1093 pos = (u8 *) (hdr + 1);
1094 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
1095 pos += RSN_SELECTOR_LEN;
1096 count_pos = pos;
1097 pos += 2;
1098
1099 count = 0;
1100
1101 /*
1102 * AES-CCMP is the default Encryption preferred for TDLS, so
1103 * RSN IE is filled only with CCMP CIPHER
1104 * Note: TKIP is not used to encrypt TDLS link.
1105 *
1106 * Regardless of the cipher used on the AP connection, select CCMP
1107 * here.
1108 */
1109 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1110 pos += RSN_SELECTOR_LEN;
1111 count++;
1112
1113 WPA_PUT_LE16(count_pos, count);
1114
1115 WPA_PUT_LE16(pos, 1);
1116 pos += 2;
1117 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
1118 pos += RSN_SELECTOR_LEN;
1119
1120 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1121 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
1122 #ifdef CONFIG_TDLS_TESTING
1123 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
1124 wpa_printf(MSG_DEBUG, "TDLS: Use alternative RSN IE for "
1125 "testing");
1126 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1127 }
1128 #endif /* CONFIG_TDLS_TESTING */
1129 WPA_PUT_LE16(pos, rsn_capab);
1130 pos += 2;
1131 #ifdef CONFIG_TDLS_TESTING
1132 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
1133 /* Number of PMKIDs */
1134 *pos++ = 0x00;
1135 *pos++ = 0x00;
1136 }
1137 #endif /* CONFIG_TDLS_TESTING */
1138
1139 hdr->len = (pos - peer->rsnie_i) - 2;
1140 peer->rsnie_i_len = pos - peer->rsnie_i;
1141 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
1142 peer->rsnie_i, peer->rsnie_i_len);
1143
1144 skip_rsnie:
1145 buf_len = 0;
1146 if (wpa_tdls_get_privacy(sm))
1147 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1148 sizeof(struct wpa_tdls_timeoutie);
1149 #ifdef CONFIG_TDLS_TESTING
1150 if (wpa_tdls_get_privacy(sm) &&
1151 (tdls_testing & TDLS_TESTING_LONG_FRAME))
1152 buf_len += 170;
1153 if (tdls_testing & TDLS_TESTING_DIFF_BSSID)
1154 buf_len += sizeof(struct wpa_tdls_lnkid);
1155 #endif /* CONFIG_TDLS_TESTING */
1156 rbuf = os_zalloc(buf_len + 1);
1157 if (rbuf == NULL) {
1158 wpa_tdls_peer_free(sm, peer);
1159 return -1;
1160 }
1161 pos = rbuf;
1162
1163 if (!wpa_tdls_get_privacy(sm))
1164 goto skip_ies;
1165
1166 /* Initiator RSN IE */
1167 pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len);
1168
1169 ftie = (struct wpa_tdls_ftie *) pos;
1170 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1171 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1172
1173 if (os_get_random(peer->inonce, WPA_NONCE_LEN)) {
1174 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1175 "TDLS: Failed to get random data for initiator Nonce");
1176 os_free(rbuf);
1177 wpa_tdls_peer_free(sm, peer);
1178 return -1;
1179 }
1180 peer->tk_set = 0; /* A new nonce results in a new TK */
1181 wpa_hexdump(MSG_DEBUG, "TDLS: Initiator Nonce for TPK handshake",
1182 peer->inonce, WPA_NONCE_LEN);
1183 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1184
1185 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK Handshake M1",
1186 (u8 *) ftie, sizeof(struct wpa_tdls_ftie));
1187
1188 pos = (u8 *) (ftie + 1);
1189
1190 #ifdef CONFIG_TDLS_TESTING
1191 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1192 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1193 "FTIE");
1194 ftie->ie_len += 170;
1195 *pos++ = 255; /* FTIE subelem */
1196 *pos++ = 168; /* FTIE subelem length */
1197 pos += 168;
1198 }
1199 #endif /* CONFIG_TDLS_TESTING */
1200
1201 /* Lifetime */
1202 peer->lifetime = TPK_LIFETIME;
1203 #ifdef CONFIG_TDLS_TESTING
1204 if (tdls_testing & TDLS_TESTING_SHORT_LIFETIME) {
1205 wpa_printf(MSG_DEBUG, "TDLS: Testing - use short TPK "
1206 "lifetime");
1207 peer->lifetime = 301;
1208 }
1209 if (tdls_testing & TDLS_TESTING_LONG_LIFETIME) {
1210 wpa_printf(MSG_DEBUG, "TDLS: Testing - use long TPK "
1211 "lifetime");
1212 peer->lifetime = 0xffffffff;
1213 }
1214 #endif /* CONFIG_TDLS_TESTING */
1215 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1216 sizeof(timeoutie), peer->lifetime);
1217 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime);
1218
1219 skip_ies:
1220
1221 #ifdef CONFIG_TDLS_TESTING
1222 if (tdls_testing & TDLS_TESTING_DIFF_BSSID) {
1223 struct wpa_tdls_lnkid *l = (struct wpa_tdls_lnkid *) pos;
1224
1225 wpa_printf(MSG_DEBUG, "TDLS: Testing - use incorrect BSSID in "
1226 "Link Identifier");
1227 wpa_tdls_linkid(sm, peer, l);
1228 l->bssid[5] ^= 0x01;
1229 pos += sizeof(*l);
1230 }
1231 #endif /* CONFIG_TDLS_TESTING */
1232
1233 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Request / TPK "
1234 "Handshake Message 1 (peer " MACSTR ")",
1235 MAC2STR(peer->addr));
1236
1237 status = wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_SETUP_REQUEST,
1238 1, 0, 0, peer->initiator, rbuf, pos - rbuf);
1239 os_free(rbuf);
1240
1241 return status;
1242 }
1243
1244
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)1245 static int wpa_tdls_send_tpk_m2(struct wpa_sm *sm,
1246 const unsigned char *src_addr, u8 dtoken,
1247 struct wpa_tdls_lnkid *lnkid,
1248 const struct wpa_tdls_peer *peer)
1249 {
1250 u8 *rbuf, *pos;
1251 size_t buf_len;
1252 u32 lifetime;
1253 struct wpa_tdls_timeoutie timeoutie;
1254 struct wpa_tdls_ftie *ftie;
1255 int status;
1256
1257 buf_len = 0;
1258 if (wpa_tdls_get_privacy(sm)) {
1259 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1260 * Lifetime */
1261 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1262 sizeof(struct wpa_tdls_timeoutie);
1263 #ifdef CONFIG_TDLS_TESTING
1264 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1265 buf_len += 170;
1266 #endif /* CONFIG_TDLS_TESTING */
1267 }
1268
1269 rbuf = os_zalloc(buf_len + 1);
1270 if (rbuf == NULL)
1271 return -1;
1272 pos = rbuf;
1273
1274 if (!wpa_tdls_get_privacy(sm))
1275 goto skip_ies;
1276
1277 /* Peer RSN IE */
1278 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1279
1280 ftie = (struct wpa_tdls_ftie *) pos;
1281 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1282 /* TODO: ftie->mic_control to set 2-RESPONSE */
1283 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1284 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1285 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1286 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK M2",
1287 (u8 *) ftie, sizeof(*ftie));
1288
1289 pos = (u8 *) (ftie + 1);
1290
1291 #ifdef CONFIG_TDLS_TESTING
1292 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1293 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1294 "FTIE");
1295 ftie->ie_len += 170;
1296 *pos++ = 255; /* FTIE subelem */
1297 *pos++ = 168; /* FTIE subelem length */
1298 pos += 168;
1299 }
1300 #endif /* CONFIG_TDLS_TESTING */
1301
1302 /* Lifetime */
1303 lifetime = peer->lifetime;
1304 #ifdef CONFIG_TDLS_TESTING
1305 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_RESP) {
1306 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1307 "lifetime in response");
1308 lifetime++;
1309 }
1310 #endif /* CONFIG_TDLS_TESTING */
1311 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1312 sizeof(timeoutie), lifetime);
1313 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds from initiator",
1314 lifetime);
1315
1316 /* compute MIC before sending */
1317 wpa_tdls_ftie_mic(peer->tpk.kck, 2, (u8 *) lnkid, peer->rsnie_p,
1318 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1319 #ifdef CONFIG_TDLS_TESTING
1320 if (tdls_testing & TDLS_TESTING_WRONG_MIC) {
1321 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong MIC");
1322 ftie->mic[0] ^= 0x01;
1323 }
1324 #endif /* CONFIG_TDLS_TESTING */
1325
1326 skip_ies:
1327 status = wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE,
1328 dtoken, 0, 0, peer->initiator, rbuf,
1329 pos - rbuf);
1330 os_free(rbuf);
1331
1332 return status;
1333 }
1334
1335
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)1336 static int wpa_tdls_send_tpk_m3(struct wpa_sm *sm,
1337 const unsigned char *src_addr, u8 dtoken,
1338 struct wpa_tdls_lnkid *lnkid,
1339 const struct wpa_tdls_peer *peer)
1340 {
1341 u8 *rbuf, *pos;
1342 size_t buf_len;
1343 struct wpa_tdls_ftie *ftie;
1344 struct wpa_tdls_timeoutie timeoutie;
1345 u32 lifetime;
1346 int status;
1347 u32 peer_capab = 0;
1348
1349 buf_len = 0;
1350 if (wpa_tdls_get_privacy(sm)) {
1351 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1352 * Lifetime */
1353 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1354 sizeof(struct wpa_tdls_timeoutie);
1355 #ifdef CONFIG_TDLS_TESTING
1356 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1357 buf_len += 170;
1358 #endif /* CONFIG_TDLS_TESTING */
1359 }
1360
1361 rbuf = os_zalloc(buf_len + 1);
1362 if (rbuf == NULL)
1363 return -1;
1364 pos = rbuf;
1365
1366 if (!wpa_tdls_get_privacy(sm))
1367 goto skip_ies;
1368
1369 /* Peer RSN IE */
1370 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1371
1372 ftie = (struct wpa_tdls_ftie *) pos;
1373 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1374 /*TODO: ftie->mic_control to set 3-CONFIRM */
1375 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1376 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1377 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1378
1379 pos = (u8 *) (ftie + 1);
1380
1381 #ifdef CONFIG_TDLS_TESTING
1382 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1383 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1384 "FTIE");
1385 ftie->ie_len += 170;
1386 *pos++ = 255; /* FTIE subelem */
1387 *pos++ = 168; /* FTIE subelem length */
1388 pos += 168;
1389 }
1390 #endif /* CONFIG_TDLS_TESTING */
1391
1392 /* Lifetime */
1393 lifetime = peer->lifetime;
1394 #ifdef CONFIG_TDLS_TESTING
1395 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_CONF) {
1396 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1397 "lifetime in confirm");
1398 lifetime++;
1399 }
1400 #endif /* CONFIG_TDLS_TESTING */
1401 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1402 sizeof(timeoutie), lifetime);
1403 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds",
1404 lifetime);
1405
1406 /* compute MIC before sending */
1407 wpa_tdls_ftie_mic(peer->tpk.kck, 3, (u8 *) lnkid, peer->rsnie_p,
1408 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1409 #ifdef CONFIG_TDLS_TESTING
1410 if (tdls_testing & TDLS_TESTING_WRONG_MIC) {
1411 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong MIC");
1412 ftie->mic[0] ^= 0x01;
1413 }
1414 #endif /* CONFIG_TDLS_TESTING */
1415
1416 skip_ies:
1417
1418 if (peer->vht_capabilities)
1419 peer_capab |= TDLS_PEER_VHT;
1420 if (peer->ht_capabilities)
1421 peer_capab |= TDLS_PEER_HT;
1422 if (peer->wmm_capable)
1423 peer_capab |= TDLS_PEER_WMM;
1424
1425 status = wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM,
1426 dtoken, 0, peer_capab, peer->initiator,
1427 rbuf, pos - rbuf);
1428 os_free(rbuf);
1429
1430 return status;
1431 }
1432
1433
wpa_tdls_send_discovery_response(struct wpa_sm * sm,struct wpa_tdls_peer * peer,u8 dialog_token)1434 static int wpa_tdls_send_discovery_response(struct wpa_sm *sm,
1435 struct wpa_tdls_peer *peer,
1436 u8 dialog_token)
1437 {
1438 size_t buf_len = 0;
1439 struct wpa_tdls_timeoutie timeoutie;
1440 u16 rsn_capab;
1441 u8 *rbuf, *pos, *count_pos;
1442 u16 count;
1443 struct rsn_ie_hdr *hdr;
1444 int status;
1445
1446 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Discovery Response "
1447 "(peer " MACSTR ")", MAC2STR(peer->addr));
1448 if (!wpa_tdls_get_privacy(sm))
1449 goto skip_rsn_ies;
1450
1451 /* Filling RSN IE */
1452 hdr = (struct rsn_ie_hdr *) peer->rsnie_i;
1453 hdr->elem_id = WLAN_EID_RSN;
1454 WPA_PUT_LE16(hdr->version, RSN_VERSION);
1455 pos = (u8 *) (hdr + 1);
1456 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
1457 pos += RSN_SELECTOR_LEN;
1458 count_pos = pos;
1459 pos += 2;
1460 count = 0;
1461
1462 /*
1463 * AES-CCMP is the default encryption preferred for TDLS, so
1464 * RSN IE is filled only with CCMP cipher suite.
1465 * Note: TKIP is not used to encrypt TDLS link.
1466 *
1467 * Regardless of the cipher used on the AP connection, select CCMP
1468 * here.
1469 */
1470 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1471 pos += RSN_SELECTOR_LEN;
1472 count++;
1473 WPA_PUT_LE16(count_pos, count);
1474 WPA_PUT_LE16(pos, 1);
1475 pos += 2;
1476 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
1477 pos += RSN_SELECTOR_LEN;
1478
1479 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1480 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
1481 WPA_PUT_LE16(pos, rsn_capab);
1482 pos += 2;
1483 hdr->len = (pos - (u8 *) hdr) - 2;
1484 peer->rsnie_i_len = pos - peer->rsnie_i;
1485
1486 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for Discovery Response",
1487 (u8 *) hdr, hdr->len + 2);
1488 skip_rsn_ies:
1489 buf_len = 0;
1490 if (wpa_tdls_get_privacy(sm)) {
1491 /* Peer RSN IE, Lifetime */
1492 buf_len += peer->rsnie_i_len +
1493 sizeof(struct wpa_tdls_timeoutie);
1494 }
1495 rbuf = os_zalloc(buf_len + 1);
1496 if (rbuf == NULL) {
1497 wpa_tdls_peer_free(sm, peer);
1498 return -1;
1499 }
1500 pos = rbuf;
1501
1502 if (!wpa_tdls_get_privacy(sm))
1503 goto skip_ies;
1504 /* Initiator RSN IE */
1505 pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len);
1506 /* Lifetime */
1507 peer->lifetime = TPK_LIFETIME;
1508 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1509 sizeof(timeoutie), peer->lifetime);
1510 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime);
1511 skip_ies:
1512 status = wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_DISCOVERY_RESPONSE,
1513 dialog_token, 0, 0, 0, rbuf, pos - rbuf);
1514 os_free(rbuf);
1515
1516 return status;
1517 }
1518
1519
1520 static int
wpa_tdls_process_discovery_request(struct wpa_sm * sm,const u8 * addr,const u8 * buf,size_t len)1521 wpa_tdls_process_discovery_request(struct wpa_sm *sm, const u8 *addr,
1522 const u8 *buf, size_t len)
1523 {
1524 struct wpa_eapol_ie_parse kde;
1525 const struct wpa_tdls_lnkid *lnkid;
1526 struct wpa_tdls_peer *peer;
1527 size_t min_req_len = sizeof(struct wpa_tdls_frame) +
1528 1 /* dialog token */ + sizeof(struct wpa_tdls_lnkid);
1529 u8 dialog_token;
1530
1531 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from " MACSTR,
1532 MAC2STR(addr));
1533
1534 if (len < min_req_len) {
1535 wpa_printf(MSG_DEBUG, "TDLS Discovery Request is too short: "
1536 "%d", (int) len);
1537 return -1;
1538 }
1539
1540 dialog_token = buf[sizeof(struct wpa_tdls_frame)];
1541
1542 /*
1543 * Some APs will tack on a weird IE to the end of a TDLS
1544 * discovery request packet. This needn't fail the response,
1545 * since the required IE are verified separately.
1546 */
1547 if (wpa_supplicant_parse_ies(buf + sizeof(struct wpa_tdls_frame) + 1,
1548 len - (sizeof(struct wpa_tdls_frame) + 1),
1549 &kde) < 0) {
1550 wpa_printf(MSG_DEBUG,
1551 "TDLS: Failed to parse IEs in Discovery Request - ignore as an interop workaround");
1552 }
1553
1554 if (!kde.lnkid) {
1555 wpa_printf(MSG_DEBUG, "TDLS: Link ID not found in Discovery "
1556 "Request");
1557 return -1;
1558 }
1559
1560 lnkid = (const struct wpa_tdls_lnkid *) kde.lnkid;
1561
1562 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1563 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from different "
1564 " BSS " MACSTR, MAC2STR(lnkid->bssid));
1565 return -1;
1566 }
1567
1568 peer = wpa_tdls_add_peer(sm, addr, NULL);
1569 if (peer == NULL)
1570 return -1;
1571
1572 return wpa_tdls_send_discovery_response(sm, peer, dialog_token);
1573 }
1574
1575
wpa_tdls_send_discovery_request(struct wpa_sm * sm,const u8 * addr)1576 int wpa_tdls_send_discovery_request(struct wpa_sm *sm, const u8 *addr)
1577 {
1578 if (sm->tdls_disabled || !sm->tdls_supported)
1579 return -1;
1580
1581 wpa_printf(MSG_DEBUG, "TDLS: Sending Discovery Request to peer "
1582 MACSTR, MAC2STR(addr));
1583 return wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_DISCOVERY_REQUEST,
1584 1, 0, 0, 1, NULL, 0);
1585 }
1586
1587
copy_supp_rates(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1588 static int copy_supp_rates(const struct wpa_eapol_ie_parse *kde,
1589 struct wpa_tdls_peer *peer)
1590 {
1591 if (!kde->supp_rates) {
1592 wpa_printf(MSG_DEBUG, "TDLS: No supported rates received");
1593 return -1;
1594 }
1595 peer->supp_rates_len = merge_byte_arrays(
1596 peer->supp_rates, sizeof(peer->supp_rates),
1597 kde->supp_rates + 2, kde->supp_rates_len - 2,
1598 kde->ext_supp_rates ? kde->ext_supp_rates + 2 : NULL,
1599 kde->ext_supp_rates_len - 2);
1600 return 0;
1601 }
1602
1603
copy_peer_ht_capab(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1604 static int copy_peer_ht_capab(const struct wpa_eapol_ie_parse *kde,
1605 struct wpa_tdls_peer *peer)
1606 {
1607 if (!kde->ht_capabilities) {
1608 wpa_printf(MSG_DEBUG, "TDLS: No supported ht capabilities "
1609 "received");
1610 return 0;
1611 }
1612
1613 if (!peer->ht_capabilities) {
1614 peer->ht_capabilities =
1615 os_zalloc(sizeof(struct ieee80211_ht_capabilities));
1616 if (peer->ht_capabilities == NULL)
1617 return -1;
1618 }
1619
1620 os_memcpy(peer->ht_capabilities, kde->ht_capabilities,
1621 sizeof(struct ieee80211_ht_capabilities));
1622 wpa_hexdump(MSG_DEBUG, "TDLS: Peer HT capabilities",
1623 (u8 *) peer->ht_capabilities,
1624 sizeof(struct ieee80211_ht_capabilities));
1625
1626 return 0;
1627 }
1628
1629
copy_peer_vht_capab(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1630 static int copy_peer_vht_capab(const struct wpa_eapol_ie_parse *kde,
1631 struct wpa_tdls_peer *peer)
1632 {
1633 if (!kde->vht_capabilities) {
1634 wpa_printf(MSG_DEBUG, "TDLS: No supported vht capabilities "
1635 "received");
1636 return 0;
1637 }
1638
1639 if (!peer->vht_capabilities) {
1640 peer->vht_capabilities =
1641 os_zalloc(sizeof(struct ieee80211_vht_capabilities));
1642 if (peer->vht_capabilities == NULL)
1643 return -1;
1644 }
1645
1646 os_memcpy(peer->vht_capabilities, kde->vht_capabilities,
1647 sizeof(struct ieee80211_vht_capabilities));
1648 wpa_hexdump(MSG_DEBUG, "TDLS: Peer VHT capabilities",
1649 (u8 *) peer->vht_capabilities,
1650 sizeof(struct ieee80211_vht_capabilities));
1651
1652 return 0;
1653 }
1654
1655
copy_peer_ext_capab(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1656 static int copy_peer_ext_capab(const struct wpa_eapol_ie_parse *kde,
1657 struct wpa_tdls_peer *peer)
1658 {
1659 if (!kde->ext_capab) {
1660 wpa_printf(MSG_DEBUG, "TDLS: No extended capabilities "
1661 "received");
1662 return 0;
1663 }
1664
1665 if (!peer->ext_capab || peer->ext_capab_len < kde->ext_capab_len - 2) {
1666 /* Need to allocate buffer to fit the new information */
1667 os_free(peer->ext_capab);
1668 peer->ext_capab = os_zalloc(kde->ext_capab_len - 2);
1669 if (peer->ext_capab == NULL)
1670 return -1;
1671 }
1672
1673 peer->ext_capab_len = kde->ext_capab_len - 2;
1674 os_memcpy(peer->ext_capab, kde->ext_capab + 2, peer->ext_capab_len);
1675
1676 return 0;
1677 }
1678
1679
copy_peer_wmm_capab(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1680 static int copy_peer_wmm_capab(const struct wpa_eapol_ie_parse *kde,
1681 struct wpa_tdls_peer *peer)
1682 {
1683 struct wmm_information_element *wmm;
1684
1685 if (!kde->wmm) {
1686 wpa_printf(MSG_DEBUG, "TDLS: No supported WMM capabilities received");
1687 return 0;
1688 }
1689
1690 if (kde->wmm_len < sizeof(struct wmm_information_element)) {
1691 wpa_printf(MSG_DEBUG, "TDLS: Invalid supported WMM capabilities received");
1692 return -1;
1693 }
1694
1695 wmm = (struct wmm_information_element *) kde->wmm;
1696 peer->qos_info = wmm->qos_info;
1697
1698 peer->wmm_capable = 1;
1699
1700 wpa_printf(MSG_DEBUG, "TDLS: Peer WMM QOS Info 0x%x", peer->qos_info);
1701 return 0;
1702 }
1703
1704
copy_peer_supp_channels(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1705 static int copy_peer_supp_channels(const struct wpa_eapol_ie_parse *kde,
1706 struct wpa_tdls_peer *peer)
1707 {
1708 if (!kde->supp_channels) {
1709 wpa_printf(MSG_DEBUG, "TDLS: No supported channels received");
1710 return 0;
1711 }
1712
1713 if (!peer->supp_channels ||
1714 peer->supp_channels_len < kde->supp_channels_len) {
1715 os_free(peer->supp_channels);
1716 peer->supp_channels = os_zalloc(kde->supp_channels_len);
1717 if (peer->supp_channels == NULL)
1718 return -1;
1719 }
1720
1721 peer->supp_channels_len = kde->supp_channels_len;
1722
1723 os_memcpy(peer->supp_channels, kde->supp_channels,
1724 peer->supp_channels_len);
1725 wpa_hexdump(MSG_DEBUG, "TDLS: Peer Supported Channels",
1726 (u8 *) peer->supp_channels, peer->supp_channels_len);
1727 return 0;
1728 }
1729
1730
copy_peer_supp_oper_classes(const struct wpa_eapol_ie_parse * kde,struct wpa_tdls_peer * peer)1731 static int copy_peer_supp_oper_classes(const struct wpa_eapol_ie_parse *kde,
1732 struct wpa_tdls_peer *peer)
1733 {
1734 if (!kde->supp_oper_classes) {
1735 wpa_printf(MSG_DEBUG, "TDLS: No supported operating classes received");
1736 return 0;
1737 }
1738
1739 if (!peer->supp_oper_classes ||
1740 peer->supp_oper_classes_len < kde->supp_oper_classes_len) {
1741 os_free(peer->supp_oper_classes);
1742 peer->supp_oper_classes = os_zalloc(kde->supp_oper_classes_len);
1743 if (peer->supp_oper_classes == NULL)
1744 return -1;
1745 }
1746
1747 peer->supp_oper_classes_len = kde->supp_oper_classes_len;
1748 os_memcpy(peer->supp_oper_classes, kde->supp_oper_classes,
1749 peer->supp_oper_classes_len);
1750 wpa_hexdump(MSG_DEBUG, "TDLS: Peer Supported Operating Classes",
1751 (u8 *) peer->supp_oper_classes,
1752 peer->supp_oper_classes_len);
1753 return 0;
1754 }
1755
1756
wpa_tdls_addset_peer(struct wpa_sm * sm,struct wpa_tdls_peer * peer,int add)1757 static int wpa_tdls_addset_peer(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
1758 int add)
1759 {
1760 return wpa_sm_tdls_peer_addset(sm, peer->addr, add, peer->aid,
1761 peer->capability,
1762 peer->supp_rates, peer->supp_rates_len,
1763 peer->ht_capabilities,
1764 peer->vht_capabilities,
1765 peer->qos_info, peer->wmm_capable,
1766 peer->ext_capab, peer->ext_capab_len,
1767 peer->supp_channels,
1768 peer->supp_channels_len,
1769 peer->supp_oper_classes,
1770 peer->supp_oper_classes_len);
1771 }
1772
1773
tdls_nonce_set(const u8 * nonce)1774 static int tdls_nonce_set(const u8 *nonce)
1775 {
1776 int i;
1777
1778 for (i = 0; i < WPA_NONCE_LEN; i++) {
1779 if (nonce[i])
1780 return 1;
1781 }
1782
1783 return 0;
1784 }
1785
1786
wpa_tdls_process_tpk_m1(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)1787 static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr,
1788 const u8 *buf, size_t len)
1789 {
1790 struct wpa_tdls_peer *peer;
1791 struct wpa_eapol_ie_parse kde;
1792 struct wpa_ie_data ie;
1793 int cipher;
1794 const u8 *cpos;
1795 struct wpa_tdls_ftie *ftie = NULL;
1796 struct wpa_tdls_timeoutie *timeoutie;
1797 struct wpa_tdls_lnkid *lnkid;
1798 u32 lifetime = 0;
1799 #if 0
1800 struct rsn_ie_hdr *hdr;
1801 u8 *pos;
1802 u16 rsn_capab;
1803 u16 rsn_ver;
1804 #endif
1805 u8 dtoken;
1806 u16 ielen;
1807 u16 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
1808 int tdls_prohibited = sm->tdls_prohibited;
1809 int existing_peer = 0;
1810
1811 if (len < 3 + 3)
1812 return -1;
1813
1814 cpos = buf;
1815 cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1816
1817 /* driver had already verified the frame format */
1818 dtoken = *cpos++; /* dialog token */
1819
1820 wpa_printf(MSG_INFO, "TDLS: Dialog Token in TPK M1 %d", dtoken);
1821
1822 peer = wpa_tdls_add_peer(sm, src_addr, &existing_peer);
1823 if (peer == NULL)
1824 goto error;
1825
1826 /* If found, use existing entry instead of adding a new one;
1827 * how to handle the case where both ends initiate at the
1828 * same time? */
1829 if (existing_peer) {
1830 if (peer->tpk_success) {
1831 wpa_printf(MSG_DEBUG, "TDLS: TDLS Setup Request while "
1832 "direct link is enabled - tear down the "
1833 "old link first");
1834 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
1835 wpa_tdls_peer_clear(sm, peer);
1836 } else if (peer->initiator) {
1837 /*
1838 * An entry is already present, so check if we already
1839 * sent a TDLS Setup Request. If so, compare MAC
1840 * addresses and let the STA with the lower MAC address
1841 * continue as the initiator. The other negotiation is
1842 * terminated.
1843 */
1844 if (os_memcmp(sm->own_addr, src_addr, ETH_ALEN) < 0) {
1845 wpa_printf(MSG_DEBUG, "TDLS: Discard request "
1846 "from peer with higher address "
1847 MACSTR, MAC2STR(src_addr));
1848 return -1;
1849 } else {
1850 wpa_printf(MSG_DEBUG, "TDLS: Accept request "
1851 "from peer with lower address "
1852 MACSTR " (terminate previously "
1853 "initiated negotiation",
1854 MAC2STR(src_addr));
1855 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK,
1856 peer->addr);
1857 wpa_tdls_peer_clear(sm, peer);
1858 }
1859 }
1860 }
1861
1862 /* capability information */
1863 peer->capability = WPA_GET_LE16(cpos);
1864 cpos += 2;
1865
1866 ielen = len - (cpos - buf); /* start of IE in buf */
1867
1868 /*
1869 * Don't reject the message if failing to parse IEs. The IEs we need are
1870 * explicitly checked below. Some APs may add arbitrary padding to the
1871 * end of short TDLS frames and that would look like invalid IEs.
1872 */
1873 if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0)
1874 wpa_printf(MSG_DEBUG,
1875 "TDLS: Failed to parse IEs in TPK M1 - ignore as an interop workaround");
1876
1877 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1878 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
1879 "TPK M1");
1880 goto error;
1881 }
1882 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M1",
1883 kde.lnkid, kde.lnkid_len);
1884 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1885 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1886 wpa_printf(MSG_INFO, "TDLS: TPK M1 from diff BSS");
1887 status = WLAN_STATUS_REQUEST_DECLINED;
1888 goto error;
1889 }
1890
1891 wpa_printf(MSG_DEBUG, "TDLS: TPK M1 - TPK initiator " MACSTR,
1892 MAC2STR(src_addr));
1893
1894 if (copy_supp_rates(&kde, peer) < 0)
1895 goto error;
1896
1897 if (copy_peer_ht_capab(&kde, peer) < 0)
1898 goto error;
1899
1900 if (copy_peer_vht_capab(&kde, peer) < 0)
1901 goto error;
1902
1903 if (copy_peer_ext_capab(&kde, peer) < 0)
1904 goto error;
1905
1906 if (copy_peer_supp_channels(&kde, peer) < 0)
1907 goto error;
1908
1909 if (copy_peer_supp_oper_classes(&kde, peer) < 0)
1910 goto error;
1911
1912 peer->qos_info = kde.qosinfo;
1913
1914 /* Overwrite with the qos_info obtained in WMM IE */
1915 if (copy_peer_wmm_capab(&kde, peer) < 0)
1916 goto error;
1917
1918 peer->aid = kde.aid;
1919
1920 #ifdef CONFIG_TDLS_TESTING
1921 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
1922 peer = wpa_tdls_add_peer(sm, src_addr, NULL);
1923 if (peer == NULL)
1924 goto error;
1925 wpa_printf(MSG_DEBUG, "TDLS: Testing concurrent initiation of "
1926 "TDLS setup - send own request");
1927 peer->initiator = 1;
1928 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL,
1929 NULL, 0, 0, NULL, 0, NULL, 0, NULL, 0);
1930 wpa_tdls_send_tpk_m1(sm, peer);
1931 }
1932
1933 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
1934 tdls_prohibited) {
1935 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
1936 "on TDLS");
1937 tdls_prohibited = 0;
1938 }
1939 #endif /* CONFIG_TDLS_TESTING */
1940
1941 if (tdls_prohibited) {
1942 wpa_printf(MSG_INFO, "TDLS: TDLS prohibited in this BSS");
1943 status = WLAN_STATUS_REQUEST_DECLINED;
1944 goto error;
1945 }
1946
1947 if (!wpa_tdls_get_privacy(sm)) {
1948 if (kde.rsn_ie) {
1949 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M1 while "
1950 "security is disabled");
1951 status = WLAN_STATUS_SECURITY_DISABLED;
1952 goto error;
1953 }
1954 goto skip_rsn;
1955 }
1956
1957 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
1958 kde.rsn_ie == NULL) {
1959 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M1");
1960 status = WLAN_STATUS_INVALID_PARAMETERS;
1961 goto error;
1962 }
1963
1964 if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
1965 wpa_printf(MSG_INFO, "TDLS: Too long Initiator RSN IE in "
1966 "TPK M1");
1967 status = WLAN_STATUS_INVALID_RSNIE;
1968 goto error;
1969 }
1970
1971 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
1972 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M1");
1973 status = WLAN_STATUS_INVALID_RSNIE;
1974 goto error;
1975 }
1976
1977 cipher = ie.pairwise_cipher;
1978 if (cipher & WPA_CIPHER_CCMP) {
1979 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
1980 cipher = WPA_CIPHER_CCMP;
1981 } else {
1982 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M1");
1983 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
1984 goto error;
1985 }
1986
1987 if ((ie.capabilities &
1988 (WPA_CAPABILITY_NO_PAIRWISE | WPA_CAPABILITY_PEERKEY_ENABLED)) !=
1989 WPA_CAPABILITY_PEERKEY_ENABLED) {
1990 wpa_printf(MSG_INFO, "TDLS: Invalid RSN Capabilities in "
1991 "TPK M1");
1992 status = WLAN_STATUS_INVALID_RSN_IE_CAPAB;
1993 goto error;
1994 }
1995
1996 /* Lifetime */
1997 if (kde.key_lifetime == NULL) {
1998 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1");
1999 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
2000 goto error;
2001 }
2002 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
2003 lifetime = WPA_GET_LE32(timeoutie->value);
2004 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime);
2005 if (lifetime < 300) {
2006 wpa_printf(MSG_INFO, "TDLS: Too short TPK lifetime");
2007 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
2008 goto error;
2009 }
2010
2011 skip_rsn:
2012 #ifdef CONFIG_TDLS_TESTING
2013 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
2014 if (os_memcmp(sm->own_addr, peer->addr, ETH_ALEN) < 0) {
2015 /*
2016 * The request frame from us is going to win, so do not
2017 * replace information based on this request frame from
2018 * the peer.
2019 */
2020 goto skip_rsn_check;
2021 }
2022 }
2023 #endif /* CONFIG_TDLS_TESTING */
2024
2025 peer->initiator = 0; /* Need to check */
2026 peer->dtoken = dtoken;
2027
2028 if (!wpa_tdls_get_privacy(sm)) {
2029 peer->rsnie_i_len = 0;
2030 peer->rsnie_p_len = 0;
2031 peer->cipher = WPA_CIPHER_NONE;
2032 goto skip_rsn_check;
2033 }
2034
2035 ftie = (struct wpa_tdls_ftie *) kde.ftie;
2036 os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
2037 peer->rsnie_i_len = kde.rsn_ie_len;
2038 peer->cipher = cipher;
2039
2040 if (os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) != 0 ||
2041 !tdls_nonce_set(peer->inonce)) {
2042 /*
2043 * There is no point in updating the RNonce for every obtained
2044 * TPK M1 frame (e.g., retransmission due to timeout) with the
2045 * same INonce (SNonce in FTIE). However, if the TPK M1 is
2046 * retransmitted with a different INonce, update the RNonce
2047 * since this is for a new TDLS session.
2048 */
2049 wpa_printf(MSG_DEBUG,
2050 "TDLS: New TPK M1 INonce - generate new RNonce");
2051 os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN);
2052 if (os_get_random(peer->rnonce, WPA_NONCE_LEN)) {
2053 wpa_msg(sm->ctx->ctx, MSG_WARNING,
2054 "TDLS: Failed to get random data for responder nonce");
2055 goto error;
2056 }
2057 peer->tk_set = 0; /* A new nonce results in a new TK */
2058 }
2059
2060 #if 0
2061 /* get version info from RSNIE received from Peer */
2062 hdr = (struct rsn_ie_hdr *) kde.rsn_ie;
2063 rsn_ver = WPA_GET_LE16(hdr->version);
2064
2065 /* use min(peer's version, out version) */
2066 if (rsn_ver > RSN_VERSION)
2067 rsn_ver = RSN_VERSION;
2068
2069 hdr = (struct rsn_ie_hdr *) peer->rsnie_p;
2070
2071 hdr->elem_id = WLAN_EID_RSN;
2072 WPA_PUT_LE16(hdr->version, rsn_ver);
2073 pos = (u8 *) (hdr + 1);
2074
2075 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
2076 pos += RSN_SELECTOR_LEN;
2077 /* Include only the selected cipher in pairwise cipher suite */
2078 WPA_PUT_LE16(pos, 1);
2079 pos += 2;
2080 if (cipher == WPA_CIPHER_CCMP)
2081 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
2082 pos += RSN_SELECTOR_LEN;
2083
2084 WPA_PUT_LE16(pos, 1);
2085 pos += 2;
2086 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
2087 pos += RSN_SELECTOR_LEN;
2088
2089 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
2090 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
2091 WPA_PUT_LE16(pos, rsn_capab);
2092 pos += 2;
2093
2094 hdr->len = (pos - peer->rsnie_p) - 2;
2095 peer->rsnie_p_len = pos - peer->rsnie_p;
2096 #endif
2097
2098 /* temp fix: validation of RSNIE later */
2099 os_memcpy(peer->rsnie_p, peer->rsnie_i, peer->rsnie_i_len);
2100 peer->rsnie_p_len = peer->rsnie_i_len;
2101
2102 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
2103 peer->rsnie_p, peer->rsnie_p_len);
2104
2105 peer->lifetime = lifetime;
2106
2107 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
2108
2109 skip_rsn_check:
2110 #ifdef CONFIG_TDLS_TESTING
2111 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT)
2112 goto skip_add_peer;
2113 #endif /* CONFIG_TDLS_TESTING */
2114
2115 /* add supported rates, capabilities, and qos_info to the TDLS peer */
2116 if (wpa_tdls_addset_peer(sm, peer, 1) < 0)
2117 goto error;
2118
2119 #ifdef CONFIG_TDLS_TESTING
2120 skip_add_peer:
2121 #endif /* CONFIG_TDLS_TESTING */
2122 peer->tpk_in_progress = 1;
2123
2124 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Response / TPK M2");
2125 if (wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer) < 0) {
2126 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2127 goto error;
2128 }
2129
2130 return 0;
2131
2132 error:
2133 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0,
2134 status);
2135 if (peer)
2136 wpa_tdls_peer_free(sm, peer);
2137 return -1;
2138 }
2139
2140
wpa_tdls_enable_link(struct wpa_sm * sm,struct wpa_tdls_peer * peer)2141 static int wpa_tdls_enable_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
2142 {
2143 peer->tpk_success = 1;
2144 peer->tpk_in_progress = 0;
2145 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
2146 if (wpa_tdls_get_privacy(sm)) {
2147 u32 lifetime = peer->lifetime;
2148 /*
2149 * Start the initiator process a bit earlier to avoid race
2150 * condition with the responder sending teardown request.
2151 */
2152 if (lifetime > 3 && peer->initiator)
2153 lifetime -= 3;
2154 eloop_register_timeout(lifetime, 0, wpa_tdls_tpk_timeout,
2155 sm, peer);
2156 #ifdef CONFIG_TDLS_TESTING
2157 if (tdls_testing & TDLS_TESTING_NO_TPK_EXPIRATION) {
2158 wpa_printf(MSG_DEBUG, "TDLS: Testing - disable TPK "
2159 "expiration");
2160 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
2161 }
2162 #endif /* CONFIG_TDLS_TESTING */
2163 }
2164
2165 if (peer->reconfig_key && wpa_tdls_set_key(sm, peer) < 0) {
2166 wpa_printf(MSG_INFO, "TDLS: Could not configure key to the "
2167 "driver");
2168 return -1;
2169 }
2170 peer->reconfig_key = 0;
2171
2172 return wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, peer->addr);
2173 }
2174
2175
wpa_tdls_process_tpk_m2(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)2176 static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
2177 const u8 *buf, size_t len)
2178 {
2179 struct wpa_tdls_peer *peer;
2180 struct wpa_eapol_ie_parse kde;
2181 struct wpa_ie_data ie;
2182 int cipher;
2183 struct wpa_tdls_ftie *ftie;
2184 struct wpa_tdls_timeoutie *timeoutie;
2185 struct wpa_tdls_lnkid *lnkid;
2186 u32 lifetime;
2187 u8 dtoken;
2188 int ielen;
2189 u16 status;
2190 const u8 *pos;
2191 int ret = 0;
2192
2193 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Response / TPK M2 "
2194 "(Peer " MACSTR ")", MAC2STR(src_addr));
2195 for (peer = sm->tdls; peer; peer = peer->next) {
2196 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
2197 break;
2198 }
2199 if (peer == NULL) {
2200 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
2201 "TPK M2: " MACSTR, MAC2STR(src_addr));
2202 return -1;
2203 }
2204 if (!peer->initiator) {
2205 /*
2206 * This may happen if both devices try to initiate TDLS at the
2207 * same time and we accept the TPK M1 from the peer in
2208 * wpa_tdls_process_tpk_m1() and clear our previous state.
2209 */
2210 wpa_printf(MSG_INFO, "TDLS: We were not the initiator, so "
2211 "ignore TPK M2 from " MACSTR, MAC2STR(src_addr));
2212 return -1;
2213 }
2214
2215 if (peer->tpk_success) {
2216 wpa_printf(MSG_INFO, "TDLS: Ignore incoming TPK M2 retry, from "
2217 MACSTR " as TPK M3 was already sent",
2218 MAC2STR(src_addr));
2219 return 0;
2220 }
2221
2222 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_REQUEST);
2223
2224 if (len < 3 + 2 + 1) {
2225 wpa_tdls_disable_peer_link(sm, peer);
2226 return -1;
2227 }
2228
2229 pos = buf;
2230 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
2231 status = WPA_GET_LE16(pos);
2232 pos += 2 /* status code */;
2233
2234 if (status != WLAN_STATUS_SUCCESS) {
2235 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M2: %u",
2236 status);
2237 wpa_tdls_disable_peer_link(sm, peer);
2238 return -1;
2239 }
2240
2241 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
2242
2243 /* TODO: need to verify dialog token matches here or in kernel */
2244 dtoken = *pos++; /* dialog token */
2245
2246 wpa_printf(MSG_DEBUG, "TDLS: Dialog Token in TPK M2 %d", dtoken);
2247
2248 if (len < 3 + 2 + 1 + 2) {
2249 wpa_tdls_disable_peer_link(sm, peer);
2250 return -1;
2251 }
2252
2253 /* capability information */
2254 peer->capability = WPA_GET_LE16(pos);
2255 pos += 2;
2256
2257 ielen = len - (pos - buf); /* start of IE in buf */
2258
2259 /*
2260 * Don't reject the message if failing to parse IEs. The IEs we need are
2261 * explicitly checked below. Some APs may add arbitrary padding to the
2262 * end of short TDLS frames and that would look like invalid IEs.
2263 */
2264 if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0)
2265 wpa_printf(MSG_DEBUG,
2266 "TDLS: Failed to parse IEs in TPK M2 - ignore as an interop workaround");
2267
2268 #ifdef CONFIG_TDLS_TESTING
2269 if (tdls_testing & TDLS_TESTING_DECLINE_RESP) {
2270 wpa_printf(MSG_DEBUG, "TDLS: Testing - decline response");
2271 status = WLAN_STATUS_REQUEST_DECLINED;
2272 goto error;
2273 }
2274 #endif /* CONFIG_TDLS_TESTING */
2275
2276 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
2277 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
2278 "TPK M2");
2279 goto error;
2280 }
2281 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M2",
2282 kde.lnkid, kde.lnkid_len);
2283 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
2284
2285 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
2286 wpa_printf(MSG_INFO, "TDLS: TPK M2 from different BSS");
2287 status = WLAN_STATUS_NOT_IN_SAME_BSS;
2288 goto error;
2289 }
2290
2291 if (copy_supp_rates(&kde, peer) < 0)
2292 goto error;
2293
2294 if (copy_peer_ht_capab(&kde, peer) < 0)
2295 goto error;
2296
2297 if (copy_peer_vht_capab(&kde, peer) < 0)
2298 goto error;
2299
2300 if (copy_peer_ext_capab(&kde, peer) < 0)
2301 goto error;
2302
2303 if (copy_peer_supp_channels(&kde, peer) < 0)
2304 goto error;
2305
2306 if (copy_peer_supp_oper_classes(&kde, peer) < 0)
2307 goto error;
2308
2309 peer->qos_info = kde.qosinfo;
2310
2311 /* Overwrite with the qos_info obtained in WMM IE */
2312 if (copy_peer_wmm_capab(&kde, peer) < 0)
2313 goto error;
2314
2315 peer->aid = kde.aid;
2316
2317 if (!wpa_tdls_get_privacy(sm)) {
2318 peer->rsnie_p_len = 0;
2319 peer->cipher = WPA_CIPHER_NONE;
2320 goto skip_rsn;
2321 }
2322
2323 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
2324 kde.rsn_ie == NULL) {
2325 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M2");
2326 status = WLAN_STATUS_INVALID_PARAMETERS;
2327 goto error;
2328 }
2329 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
2330 kde.rsn_ie, kde.rsn_ie_len);
2331
2332 if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
2333 wpa_printf(MSG_INFO,
2334 "TDLS: Too long Responder RSN IE in TPK M2");
2335 status = WLAN_STATUS_INVALID_RSNIE;
2336 goto error;
2337 }
2338
2339 /*
2340 * FIX: bitwise comparison of RSN IE is not the correct way of
2341 * validation this. It can be different, but certain fields must
2342 * match. Since we list only a single pairwise cipher in TPK M1, the
2343 * memcmp is likely to work in most cases, though.
2344 */
2345 if (kde.rsn_ie_len != peer->rsnie_i_len ||
2346 os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) != 0) {
2347 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M2 does "
2348 "not match with RSN IE used in TPK M1");
2349 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Sent in TPK M1",
2350 peer->rsnie_i, peer->rsnie_i_len);
2351 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
2352 kde.rsn_ie, kde.rsn_ie_len);
2353 status = WLAN_STATUS_INVALID_RSNIE;
2354 goto error;
2355 }
2356
2357 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
2358 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M2");
2359 status = WLAN_STATUS_INVALID_RSNIE;
2360 goto error;
2361 }
2362
2363 cipher = ie.pairwise_cipher;
2364 if (cipher == WPA_CIPHER_CCMP) {
2365 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
2366 cipher = WPA_CIPHER_CCMP;
2367 } else {
2368 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M2");
2369 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
2370 goto error;
2371 }
2372
2373 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M2",
2374 kde.ftie, sizeof(*ftie));
2375 ftie = (struct wpa_tdls_ftie *) kde.ftie;
2376
2377 if (os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) != 0) {
2378 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does "
2379 "not match with FTIE SNonce used in TPK M1");
2380 /* Silently discard the frame */
2381 return -1;
2382 }
2383
2384 /* Responder Nonce and RSN IE */
2385 os_memcpy(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN);
2386 os_memcpy(peer->rsnie_p, kde.rsn_ie, kde.rsn_ie_len);
2387 peer->rsnie_p_len = kde.rsn_ie_len;
2388 peer->cipher = cipher;
2389
2390 /* Lifetime */
2391 if (kde.key_lifetime == NULL) {
2392 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M2");
2393 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
2394 goto error;
2395 }
2396 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
2397 lifetime = WPA_GET_LE32(timeoutie->value);
2398 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M2",
2399 lifetime);
2400 if (lifetime != peer->lifetime) {
2401 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
2402 "TPK M2 (expected %u)", lifetime, peer->lifetime);
2403 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
2404 goto error;
2405 }
2406
2407 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
2408
2409 /* Process MIC check to see if TPK M2 is right */
2410 if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid,
2411 (u8 *) timeoutie, ftie) < 0) {
2412 /* Discard the frame */
2413 wpa_tdls_del_key(sm, peer);
2414 wpa_tdls_disable_peer_link(sm, peer);
2415 return -1;
2416 }
2417
2418 if (wpa_tdls_set_key(sm, peer) < 0) {
2419 /*
2420 * Some drivers may not be able to config the key prior to full
2421 * STA entry having been configured.
2422 */
2423 wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after "
2424 "STA entry is complete");
2425 peer->reconfig_key = 1;
2426 }
2427
2428 skip_rsn:
2429 peer->dtoken = dtoken;
2430
2431 /* add supported rates, capabilities, and qos_info to the TDLS peer */
2432 if (wpa_tdls_addset_peer(sm, peer, 0) < 0)
2433 goto error;
2434
2435 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Confirm / "
2436 "TPK Handshake Message 3");
2437 if (wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer) < 0)
2438 goto error_no_msg;
2439
2440 if (!peer->tpk_success) {
2441 /*
2442 * Enable Link only when tpk_success is 0, signifying that this
2443 * processing of TPK M2 frame is not because of a retransmission
2444 * during TDLS setup handshake.
2445 */
2446 ret = wpa_tdls_enable_link(sm, peer);
2447 if (ret < 0) {
2448 wpa_printf(MSG_DEBUG, "TDLS: Could not enable link");
2449 wpa_tdls_do_teardown(
2450 sm, peer,
2451 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
2452 }
2453 }
2454 return ret;
2455
2456 error:
2457 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 1,
2458 status);
2459 error_no_msg:
2460 wpa_tdls_disable_peer_link(sm, peer);
2461 return -1;
2462 }
2463
2464
wpa_tdls_process_tpk_m3(struct wpa_sm * sm,const u8 * src_addr,const u8 * buf,size_t len)2465 static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr,
2466 const u8 *buf, size_t len)
2467 {
2468 struct wpa_tdls_peer *peer;
2469 struct wpa_eapol_ie_parse kde;
2470 struct wpa_tdls_ftie *ftie;
2471 struct wpa_tdls_timeoutie *timeoutie;
2472 struct wpa_tdls_lnkid *lnkid;
2473 int ielen;
2474 u16 status;
2475 const u8 *pos;
2476 u32 lifetime;
2477 int ret = 0;
2478
2479 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Confirm / TPK M3 "
2480 "(Peer " MACSTR ")", MAC2STR(src_addr));
2481 for (peer = sm->tdls; peer; peer = peer->next) {
2482 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
2483 break;
2484 }
2485 if (peer == NULL) {
2486 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
2487 "TPK M3: " MACSTR, MAC2STR(src_addr));
2488 return -1;
2489 }
2490 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_RESPONSE);
2491
2492 if (len < 3 + 3)
2493 goto error;
2494 pos = buf;
2495 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
2496
2497 status = WPA_GET_LE16(pos);
2498
2499 if (status != 0) {
2500 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M3: %u",
2501 status);
2502 goto error;
2503 }
2504 pos += 2 /* status code */ + 1 /* dialog token */;
2505
2506 ielen = len - (pos - buf); /* start of IE in buf */
2507
2508 /*
2509 * Don't reject the message if failing to parse IEs. The IEs we need are
2510 * explicitly checked below. Some APs piggy-back broken IEs to the end
2511 * of a TDLS Confirm packet, which will fail the link if we don't ignore
2512 * this error.
2513 */
2514 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) {
2515 wpa_printf(MSG_DEBUG,
2516 "TDLS: Failed to parse KDEs in TPK M3 - ignore as an interop workaround");
2517 }
2518
2519 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
2520 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M3");
2521 goto error;
2522 }
2523 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M3",
2524 (u8 *) kde.lnkid, kde.lnkid_len);
2525 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
2526
2527 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
2528 wpa_printf(MSG_INFO, "TDLS: TPK M3 from diff BSS");
2529 goto error;
2530 }
2531
2532 if (!wpa_tdls_get_privacy(sm))
2533 goto skip_rsn;
2534
2535 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
2536 wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M3");
2537 goto error;
2538 }
2539 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M3",
2540 kde.ftie, sizeof(*ftie));
2541 ftie = (struct wpa_tdls_ftie *) kde.ftie;
2542
2543 if (kde.rsn_ie == NULL) {
2544 wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M3");
2545 goto error;
2546 }
2547 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M3",
2548 kde.rsn_ie, kde.rsn_ie_len);
2549 if (kde.rsn_ie_len != peer->rsnie_p_len ||
2550 os_memcmp(kde.rsn_ie, peer->rsnie_p, peer->rsnie_p_len) != 0) {
2551 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M3 does not match "
2552 "with the one sent in TPK M2");
2553 goto error;
2554 }
2555
2556 if (os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) != 0) {
2557 wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does "
2558 "not match with FTIE ANonce used in TPK M2");
2559 goto error;
2560 }
2561
2562 if (os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) != 0) {
2563 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M3 does not "
2564 "match with FTIE SNonce used in TPK M1");
2565 goto error;
2566 }
2567
2568 if (kde.key_lifetime == NULL) {
2569 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M3");
2570 goto error;
2571 }
2572 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
2573 wpa_hexdump(MSG_DEBUG, "TDLS: Timeout IE Received from TPK M3",
2574 (u8 *) timeoutie, sizeof(*timeoutie));
2575 lifetime = WPA_GET_LE32(timeoutie->value);
2576 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M3",
2577 lifetime);
2578 if (lifetime != peer->lifetime) {
2579 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
2580 "TPK M3 (expected %u)", lifetime, peer->lifetime);
2581 goto error;
2582 }
2583
2584 if (wpa_supplicant_verify_tdls_mic(3, peer, (u8 *) lnkid,
2585 (u8 *) timeoutie, ftie) < 0) {
2586 wpa_tdls_del_key(sm, peer);
2587 goto error;
2588 }
2589
2590 if (wpa_tdls_set_key(sm, peer) < 0) {
2591 /*
2592 * Some drivers may not be able to config the key prior to full
2593 * STA entry having been configured.
2594 */
2595 wpa_printf(MSG_DEBUG, "TDLS: Try to configure TPK again after "
2596 "STA entry is complete");
2597 peer->reconfig_key = 1;
2598 }
2599
2600 skip_rsn:
2601 /* add supported rates, capabilities, and qos_info to the TDLS peer */
2602 if (wpa_tdls_addset_peer(sm, peer, 0) < 0)
2603 goto error;
2604
2605 if (!peer->tpk_success) {
2606 /*
2607 * Enable Link only when tpk_success is 0, signifying that this
2608 * processing of TPK M3 frame is not because of a retransmission
2609 * during TDLS setup handshake.
2610 */
2611 ret = wpa_tdls_enable_link(sm, peer);
2612 if (ret < 0) {
2613 wpa_printf(MSG_DEBUG, "TDLS: Could not enable link");
2614 goto error;
2615 }
2616 }
2617 return ret;
2618 error:
2619 wpa_tdls_do_teardown(sm, peer, WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
2620 return -1;
2621 }
2622
2623
wpa_add_tdls_timeoutie(u8 * pos,u8 * ie,size_t ie_len,u32 tsecs)2624 static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs)
2625 {
2626 struct wpa_tdls_timeoutie *lifetime = (struct wpa_tdls_timeoutie *) ie;
2627
2628 os_memset(lifetime, 0, ie_len);
2629 lifetime->ie_type = WLAN_EID_TIMEOUT_INTERVAL;
2630 lifetime->ie_len = sizeof(struct wpa_tdls_timeoutie) - 2;
2631 lifetime->interval_type = WLAN_TIMEOUT_KEY_LIFETIME;
2632 WPA_PUT_LE32(lifetime->value, tsecs);
2633 os_memcpy(pos, ie, ie_len);
2634 return pos + ie_len;
2635 }
2636
2637
2638 /**
2639 * wpa_tdls_start - Initiate TDLS handshake (send TPK Handshake Message 1)
2640 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2641 * @peer: MAC address of the peer STA
2642 * Returns: 0 on success, or -1 on failure
2643 *
2644 * Send TPK Handshake Message 1 info to driver to start TDLS
2645 * handshake with the peer.
2646 */
wpa_tdls_start(struct wpa_sm * sm,const u8 * addr)2647 int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr)
2648 {
2649 struct wpa_tdls_peer *peer;
2650 int tdls_prohibited = sm->tdls_prohibited;
2651
2652 if (sm->tdls_disabled || !sm->tdls_supported)
2653 return -1;
2654
2655 #ifdef CONFIG_TDLS_TESTING
2656 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
2657 tdls_prohibited) {
2658 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
2659 "on TDLS");
2660 tdls_prohibited = 0;
2661 }
2662 #endif /* CONFIG_TDLS_TESTING */
2663
2664 if (tdls_prohibited) {
2665 wpa_printf(MSG_DEBUG, "TDLS: TDLS is prohibited in this BSS - "
2666 "reject request to start setup");
2667 return -1;
2668 }
2669
2670 peer = wpa_tdls_add_peer(sm, addr, NULL);
2671 if (peer == NULL)
2672 return -1;
2673
2674 if (peer->tpk_in_progress) {
2675 wpa_printf(MSG_DEBUG, "TDLS: Setup is already in progress with the peer");
2676 return 0;
2677 }
2678
2679 peer->initiator = 1;
2680
2681 /* add the peer to the driver as a "setup in progress" peer */
2682 if (wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, 0, NULL, 0, NULL,
2683 NULL, 0, 0, NULL, 0, NULL, 0, NULL, 0)) {
2684 wpa_tdls_disable_peer_link(sm, peer);
2685 return -1;
2686 }
2687
2688 peer->tpk_in_progress = 1;
2689
2690 if (wpa_tdls_send_tpk_m1(sm, peer) < 0) {
2691 wpa_tdls_disable_peer_link(sm, peer);
2692 return -1;
2693 }
2694
2695 return 0;
2696 }
2697
2698
wpa_tdls_remove(struct wpa_sm * sm,const u8 * addr)2699 void wpa_tdls_remove(struct wpa_sm *sm, const u8 *addr)
2700 {
2701 struct wpa_tdls_peer *peer;
2702
2703 if (sm->tdls_disabled || !sm->tdls_supported)
2704 return;
2705
2706 for (peer = sm->tdls; peer; peer = peer->next) {
2707 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
2708 break;
2709 }
2710
2711 if (peer == NULL || !peer->tpk_success)
2712 return;
2713
2714 if (sm->tdls_external_setup) {
2715 /*
2716 * Disable previous link to allow renegotiation to be completed
2717 * on AP path.
2718 */
2719 wpa_tdls_do_teardown(sm, peer,
2720 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED);
2721 }
2722 }
2723
2724
2725 /**
2726 * wpa_supplicant_rx_tdls - Receive TDLS data frame
2727 *
2728 * This function is called to receive TDLS (ethertype = 0x890d) data frames.
2729 */
wpa_supplicant_rx_tdls(void * ctx,const u8 * src_addr,const u8 * buf,size_t len)2730 static void wpa_supplicant_rx_tdls(void *ctx, const u8 *src_addr,
2731 const u8 *buf, size_t len)
2732 {
2733 struct wpa_sm *sm = ctx;
2734 struct wpa_tdls_frame *tf;
2735
2736 wpa_hexdump(MSG_DEBUG, "TDLS: Received Data frame encapsulation",
2737 buf, len);
2738
2739 if (sm->tdls_disabled || !sm->tdls_supported) {
2740 wpa_printf(MSG_DEBUG, "TDLS: Discard message - TDLS disabled "
2741 "or unsupported by driver");
2742 return;
2743 }
2744
2745 if (os_memcmp(src_addr, sm->own_addr, ETH_ALEN) == 0) {
2746 wpa_printf(MSG_DEBUG, "TDLS: Discard copy of own message");
2747 return;
2748 }
2749
2750 if (len < sizeof(*tf)) {
2751 wpa_printf(MSG_INFO, "TDLS: Drop too short frame");
2752 return;
2753 }
2754
2755 /* Check to make sure its a valid encapsulated TDLS frame */
2756 tf = (struct wpa_tdls_frame *) buf;
2757 if (tf->payloadtype != 2 /* TDLS_RFTYPE */ ||
2758 tf->category != WLAN_ACTION_TDLS) {
2759 wpa_printf(MSG_INFO, "TDLS: Invalid frame - payloadtype=%u "
2760 "category=%u action=%u",
2761 tf->payloadtype, tf->category, tf->action);
2762 return;
2763 }
2764
2765 switch (tf->action) {
2766 case WLAN_TDLS_SETUP_REQUEST:
2767 wpa_tdls_process_tpk_m1(sm, src_addr, buf, len);
2768 break;
2769 case WLAN_TDLS_SETUP_RESPONSE:
2770 wpa_tdls_process_tpk_m2(sm, src_addr, buf, len);
2771 break;
2772 case WLAN_TDLS_SETUP_CONFIRM:
2773 wpa_tdls_process_tpk_m3(sm, src_addr, buf, len);
2774 break;
2775 case WLAN_TDLS_TEARDOWN:
2776 wpa_tdls_recv_teardown(sm, src_addr, buf, len);
2777 break;
2778 case WLAN_TDLS_DISCOVERY_REQUEST:
2779 wpa_tdls_process_discovery_request(sm, src_addr, buf, len);
2780 break;
2781 default:
2782 /* Kernel code will process remaining frames */
2783 wpa_printf(MSG_DEBUG, "TDLS: Ignore TDLS frame action code %u",
2784 tf->action);
2785 break;
2786 }
2787 }
2788
2789
2790 /**
2791 * wpa_tdls_init - Initialize driver interface parameters for TDLS
2792 * @wpa_s: Pointer to wpa_supplicant data
2793 * Returns: 0 on success, -1 on failure
2794 *
2795 * This function is called to initialize driver interface parameters for TDLS.
2796 * wpa_drv_init() must have been called before this function to initialize the
2797 * driver interface.
2798 */
wpa_tdls_init(struct wpa_sm * sm)2799 int wpa_tdls_init(struct wpa_sm *sm)
2800 {
2801 if (sm == NULL)
2802 return -1;
2803
2804 sm->l2_tdls = l2_packet_init(sm->bridge_ifname ? sm->bridge_ifname :
2805 sm->ifname,
2806 sm->own_addr,
2807 ETH_P_80211_ENCAP, wpa_supplicant_rx_tdls,
2808 sm, 0);
2809 if (sm->l2_tdls == NULL) {
2810 wpa_printf(MSG_ERROR, "TDLS: Failed to open l2_packet "
2811 "connection");
2812 return -1;
2813 }
2814
2815 /*
2816 * Drivers that support TDLS but don't implement the get_capa callback
2817 * are assumed to perform everything internally
2818 */
2819 if (wpa_sm_tdls_get_capa(sm, &sm->tdls_supported,
2820 &sm->tdls_external_setup,
2821 &sm->tdls_chan_switch) < 0) {
2822 sm->tdls_supported = 1;
2823 sm->tdls_external_setup = 0;
2824 }
2825
2826 wpa_printf(MSG_DEBUG, "TDLS: TDLS operation%s supported by "
2827 "driver", sm->tdls_supported ? "" : " not");
2828 wpa_printf(MSG_DEBUG, "TDLS: Driver uses %s link setup",
2829 sm->tdls_external_setup ? "external" : "internal");
2830 wpa_printf(MSG_DEBUG, "TDLS: Driver %s TDLS channel switching",
2831 sm->tdls_chan_switch ? "supports" : "does not support");
2832
2833 return 0;
2834 }
2835
2836
wpa_tdls_teardown_peers(struct wpa_sm * sm)2837 void wpa_tdls_teardown_peers(struct wpa_sm *sm)
2838 {
2839 struct wpa_tdls_peer *peer, *tmp;
2840
2841 if (!sm)
2842 return;
2843 peer = sm->tdls;
2844
2845 wpa_printf(MSG_DEBUG, "TDLS: Tear down peers");
2846
2847 while (peer) {
2848 tmp = peer->next;
2849 wpa_printf(MSG_DEBUG, "TDLS: Tear down peer " MACSTR,
2850 MAC2STR(peer->addr));
2851 if (sm->tdls_external_setup)
2852 wpa_tdls_do_teardown(sm, peer,
2853 WLAN_REASON_DEAUTH_LEAVING);
2854 else
2855 wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr);
2856
2857 peer = tmp;
2858 }
2859 }
2860
2861
wpa_tdls_remove_peers(struct wpa_sm * sm)2862 static void wpa_tdls_remove_peers(struct wpa_sm *sm)
2863 {
2864 struct wpa_tdls_peer *peer, *tmp;
2865
2866 peer = sm->tdls;
2867
2868 while (peer) {
2869 int res;
2870 tmp = peer->next;
2871 res = wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2872 wpa_printf(MSG_DEBUG, "TDLS: Remove peer " MACSTR " (res=%d)",
2873 MAC2STR(peer->addr), res);
2874 wpa_tdls_peer_free(sm, peer);
2875 peer = tmp;
2876 }
2877 }
2878
2879
2880 /**
2881 * wpa_tdls_deinit - Deinitialize driver interface parameters for TDLS
2882 *
2883 * This function is called to recover driver interface parameters for TDLS
2884 * and frees resources allocated for it.
2885 */
wpa_tdls_deinit(struct wpa_sm * sm)2886 void wpa_tdls_deinit(struct wpa_sm *sm)
2887 {
2888 if (sm == NULL)
2889 return;
2890
2891 if (sm->l2_tdls)
2892 l2_packet_deinit(sm->l2_tdls);
2893 sm->l2_tdls = NULL;
2894
2895 wpa_tdls_remove_peers(sm);
2896 }
2897
2898
wpa_tdls_assoc(struct wpa_sm * sm)2899 void wpa_tdls_assoc(struct wpa_sm *sm)
2900 {
2901 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on association");
2902 wpa_tdls_remove_peers(sm);
2903 }
2904
2905
wpa_tdls_disassoc(struct wpa_sm * sm)2906 void wpa_tdls_disassoc(struct wpa_sm *sm)
2907 {
2908 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on disassociation");
2909 wpa_tdls_remove_peers(sm);
2910 }
2911
2912
wpa_tdls_prohibited(struct ieee802_11_elems * elems)2913 static int wpa_tdls_prohibited(struct ieee802_11_elems *elems)
2914 {
2915 /* bit 38 - TDLS Prohibited */
2916 return !!(elems->ext_capab[4] & 0x40);
2917 }
2918
2919
wpa_tdls_chan_switch_prohibited(struct ieee802_11_elems * elems)2920 static int wpa_tdls_chan_switch_prohibited(struct ieee802_11_elems *elems)
2921 {
2922 /* bit 39 - TDLS Channel Switch Prohibited */
2923 return !!(elems->ext_capab[4] & 0x80);
2924 }
2925
2926
wpa_tdls_ap_ies(struct wpa_sm * sm,const u8 * ies,size_t len)2927 void wpa_tdls_ap_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2928 {
2929 struct ieee802_11_elems elems;
2930
2931 sm->tdls_prohibited = 0;
2932 sm->tdls_chan_switch_prohibited = 0;
2933
2934 if (ies == NULL ||
2935 ieee802_11_parse_elems(ies, len, &elems, 0) == ParseFailed ||
2936 elems.ext_capab == NULL || elems.ext_capab_len < 5)
2937 return;
2938
2939 sm->tdls_prohibited = wpa_tdls_prohibited(&elems);
2940 wpa_printf(MSG_DEBUG, "TDLS: TDLS is %s in the target BSS",
2941 sm->tdls_prohibited ? "prohibited" : "allowed");
2942 sm->tdls_chan_switch_prohibited =
2943 wpa_tdls_chan_switch_prohibited(&elems);
2944 wpa_printf(MSG_DEBUG, "TDLS: TDLS channel switch %s in the target BSS",
2945 sm->tdls_chan_switch_prohibited ? "prohibited" : "allowed");
2946 }
2947
2948
wpa_tdls_assoc_resp_ies(struct wpa_sm * sm,const u8 * ies,size_t len)2949 void wpa_tdls_assoc_resp_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2950 {
2951 struct ieee802_11_elems elems;
2952
2953 if (ies == NULL ||
2954 ieee802_11_parse_elems(ies, len, &elems, 0) == ParseFailed ||
2955 elems.ext_capab == NULL || elems.ext_capab_len < 5)
2956 return;
2957
2958 if (!sm->tdls_prohibited && wpa_tdls_prohibited(&elems)) {
2959 wpa_printf(MSG_DEBUG, "TDLS: TDLS prohibited based on "
2960 "(Re)Association Response IEs");
2961 sm->tdls_prohibited = 1;
2962 }
2963
2964 if (!sm->tdls_chan_switch_prohibited &&
2965 wpa_tdls_chan_switch_prohibited(&elems)) {
2966 wpa_printf(MSG_DEBUG,
2967 "TDLS: TDLS channel switch prohibited based on (Re)Association Response IEs");
2968 sm->tdls_chan_switch_prohibited = 1;
2969 }
2970 }
2971
2972
wpa_tdls_enable(struct wpa_sm * sm,int enabled)2973 void wpa_tdls_enable(struct wpa_sm *sm, int enabled)
2974 {
2975 wpa_printf(MSG_DEBUG, "TDLS: %s", enabled ? "enabled" : "disabled");
2976 sm->tdls_disabled = !enabled;
2977 }
2978
2979
wpa_tdls_is_external_setup(struct wpa_sm * sm)2980 int wpa_tdls_is_external_setup(struct wpa_sm *sm)
2981 {
2982 return sm->tdls_external_setup;
2983 }
2984
2985
wpa_tdls_enable_chan_switch(struct wpa_sm * sm,const u8 * addr,u8 oper_class,struct hostapd_freq_params * freq_params)2986 int wpa_tdls_enable_chan_switch(struct wpa_sm *sm, const u8 *addr,
2987 u8 oper_class,
2988 struct hostapd_freq_params *freq_params)
2989 {
2990 struct wpa_tdls_peer *peer;
2991 int ret;
2992
2993 if (sm->tdls_disabled || !sm->tdls_supported)
2994 return -1;
2995
2996 if (!sm->tdls_chan_switch) {
2997 wpa_printf(MSG_DEBUG,
2998 "TDLS: Channel switching not supported by the driver");
2999 return -1;
3000 }
3001
3002 if (sm->tdls_chan_switch_prohibited) {
3003 wpa_printf(MSG_DEBUG,
3004 "TDLS: Channel switching is prohibited in this BSS - reject request to switch channel");
3005 return -1;
3006 }
3007
3008 for (peer = sm->tdls; peer; peer = peer->next) {
3009 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
3010 break;
3011 }
3012
3013 if (peer == NULL || !peer->tpk_success) {
3014 wpa_printf(MSG_ERROR, "TDLS: Peer " MACSTR
3015 " not found for channel switching", MAC2STR(addr));
3016 return -1;
3017 }
3018
3019 if (peer->chan_switch_enabled) {
3020 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR
3021 " already has channel switching enabled",
3022 MAC2STR(addr));
3023 return 0;
3024 }
3025
3026 ret = wpa_sm_tdls_enable_channel_switch(sm, peer->addr,
3027 oper_class, freq_params);
3028 if (!ret)
3029 peer->chan_switch_enabled = 1;
3030
3031 return ret;
3032 }
3033
3034
wpa_tdls_disable_chan_switch(struct wpa_sm * sm,const u8 * addr)3035 int wpa_tdls_disable_chan_switch(struct wpa_sm *sm, const u8 *addr)
3036 {
3037 struct wpa_tdls_peer *peer;
3038
3039 if (sm->tdls_disabled || !sm->tdls_supported)
3040 return -1;
3041
3042 for (peer = sm->tdls; peer; peer = peer->next) {
3043 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
3044 break;
3045 }
3046
3047 if (!peer || !peer->chan_switch_enabled) {
3048 wpa_printf(MSG_ERROR, "TDLS: Channel switching not enabled for "
3049 MACSTR, MAC2STR(addr));
3050 return -1;
3051 }
3052
3053 /* ignore the return value */
3054 wpa_sm_tdls_disable_channel_switch(sm, peer->addr);
3055
3056 peer->chan_switch_enabled = 0;
3057 return 0;
3058 }
3059