2 * Received Data frame processing for TDLS packets
3 * Copyright (c) 2010, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
9 #include "utils/includes.h"
11 #include "utils/common.h"
12 #include "crypto/sha256.h"
13 #include "crypto/crypto.h"
14 #include "crypto/aes_wrap.h"
15 #include "common/ieee802_11_defs.h"
16 #include "common/ieee802_11_common.h"
20 static struct wlantest_tdls
* get_tdls(struct wlantest
*wt
, const u8
*linkid
,
21 int create_new
, const u8
*bssid
)
23 struct wlantest_bss
*bss
;
24 struct wlantest_sta
*init
, *resp
;
25 struct wlantest_tdls
*tdls
;
27 bss
= bss_find(wt
, linkid
);
28 if (bss
== NULL
&& bssid
) {
29 bss
= bss_find(wt
, bssid
);
31 add_note(wt
, MSG_INFO
, "TDLS: Incorrect BSSID " MACSTR
32 " in LinkId?! (init=" MACSTR
" resp="
34 MAC2STR(linkid
), MAC2STR(linkid
+ ETH_ALEN
),
35 MAC2STR(linkid
+ 2 * ETH_ALEN
));
40 init
= sta_find(bss
, linkid
+ ETH_ALEN
);
44 resp
= sta_find(bss
, linkid
+ 2 * ETH_ALEN
);
48 dl_list_for_each(tdls
, &bss
->tdls
, struct wlantest_tdls
, list
) {
49 if (tdls
->init
== init
&& tdls
->resp
== resp
)
56 add_note(wt
, MSG_DEBUG
, "Add new TDLS link context: initiator " MACSTR
57 " responder " MACSTR
" BSSID " MACSTR
,
58 MAC2STR(linkid
+ ETH_ALEN
),
59 MAC2STR(linkid
+ 2 * ETH_ALEN
),
62 tdls
= os_zalloc(sizeof(*tdls
));
67 dl_list_add(&bss
->tdls
, &tdls
->list
);
72 static int tdls_derive_tpk(struct wlantest_tdls
*tdls
, const u8
*bssid
,
73 const u8
*ftie
, u8 ftie_len
)
75 const struct rsn_ftie
*f
;
76 u8 key_input
[SHA256_MAC_LEN
];
79 u8 data
[3 * ETH_ALEN
];
81 if (ftie
== NULL
|| ftie_len
< sizeof(struct rsn_ftie
))
84 f
= (const struct rsn_ftie
*) ftie
;
85 wpa_hexdump(MSG_DEBUG
, "TDLS ANonce", f
->anonce
, WPA_NONCE_LEN
);
86 wpa_hexdump(MSG_DEBUG
, "TDLS SNonce", f
->snonce
, WPA_NONCE_LEN
);
89 * IEEE Std 802.11z-2010 8.5.9.1:
90 * TPK-Key-Input = SHA-256(min(SNonce, ANonce) || max(SNonce, ANonce))
92 len
[0] = WPA_NONCE_LEN
;
93 len
[1] = WPA_NONCE_LEN
;
94 if (os_memcmp(f
->anonce
, f
->snonce
, WPA_NONCE_LEN
) < 0) {
101 sha256_vector(2, nonce
, len
, key_input
);
102 wpa_hexdump_key(MSG_DEBUG
, "TDLS: TPK-Key-Input",
103 key_input
, SHA256_MAC_LEN
);
106 * TPK-Key-Data = KDF-N_KEY(TPK-Key-Input, "TDLS PMK",
107 * min(MAC_I, MAC_R) || max(MAC_I, MAC_R) || BSSID || N_KEY)
108 * TODO: is N_KEY really included in KDF Context and if so, in which
109 * presentation format (little endian 16-bit?) is it used? It gets
110 * added by the KDF anyway..
113 if (os_memcmp(tdls
->init
->addr
, tdls
->resp
->addr
, ETH_ALEN
) < 0) {
114 os_memcpy(data
, tdls
->init
->addr
, ETH_ALEN
);
115 os_memcpy(data
+ ETH_ALEN
, tdls
->resp
->addr
, ETH_ALEN
);
117 os_memcpy(data
, tdls
->resp
->addr
, ETH_ALEN
);
118 os_memcpy(data
+ ETH_ALEN
, tdls
->init
->addr
, ETH_ALEN
);
120 os_memcpy(data
+ 2 * ETH_ALEN
, bssid
, ETH_ALEN
);
121 wpa_hexdump(MSG_DEBUG
, "TDLS: KDF Context", data
, sizeof(data
));
123 sha256_prf(key_input
, SHA256_MAC_LEN
, "TDLS PMK", data
, sizeof(data
),
124 (u8
*) &tdls
->tpk
, sizeof(tdls
->tpk
));
125 wpa_hexdump_key(MSG_DEBUG
, "TDLS: TPK-KCK",
126 tdls
->tpk
.kck
, sizeof(tdls
->tpk
.kck
));
127 wpa_hexdump_key(MSG_DEBUG
, "TDLS: TPK-TK",
128 tdls
->tpk
.tk
, sizeof(tdls
->tpk
.tk
));
134 static int tdls_verify_mic(struct wlantest
*wt
, struct wlantest_tdls
*tdls
,
135 u8 trans_seq
, struct ieee802_11_elems
*elems
)
141 const struct rsn_ftie
*rx_ftie
;
142 struct rsn_ftie
*tmp_ftie
;
144 if (elems
->link_id
== NULL
|| elems
->rsn_ie
== NULL
||
145 elems
->timeout_int
== NULL
|| elems
->ftie
== NULL
)
148 len
= 2 * ETH_ALEN
+ 1 + 2 + 18 + 2 + elems
->rsn_ie_len
+
149 2 + elems
->timeout_int_len
+ 2 + elems
->ftie_len
;
151 buf
= os_zalloc(len
);
156 /* 1) TDLS initiator STA MAC address */
157 os_memcpy(pos
, elems
->link_id
+ ETH_ALEN
, ETH_ALEN
);
159 /* 2) TDLS responder STA MAC address */
160 os_memcpy(pos
, elems
->link_id
+ 2 * ETH_ALEN
, ETH_ALEN
);
162 /* 3) Transaction Sequence number */
164 /* 4) Link Identifier IE */
165 os_memcpy(pos
, elems
->link_id
- 2, 2 + 18);
168 os_memcpy(pos
, elems
->rsn_ie
- 2, 2 + elems
->rsn_ie_len
);
169 pos
+= 2 + elems
->rsn_ie_len
;
170 /* 6) Timeout Interval IE */
171 os_memcpy(pos
, elems
->timeout_int
- 2, 2 + elems
->timeout_int_len
);
172 pos
+= 2 + elems
->timeout_int_len
;
173 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
174 os_memcpy(pos
, elems
->ftie
- 2, 2 + elems
->ftie_len
);
176 tmp_ftie
= (struct rsn_ftie
*) pos
;
177 os_memset(tmp_ftie
->mic
, 0, 16);
178 pos
+= elems
->ftie_len
;
180 wpa_hexdump(MSG_DEBUG
, "TDLS: Data for FTIE MIC", buf
, pos
- buf
);
181 wpa_hexdump_key(MSG_DEBUG
, "TDLS: KCK", tdls
->tpk
.kck
, 16);
182 ret
= omac1_aes_128(tdls
->tpk
.kck
, buf
, pos
- buf
, mic
);
186 wpa_hexdump(MSG_DEBUG
, "TDLS: FTIE MIC", mic
, 16);
187 rx_ftie
= (const struct rsn_ftie
*) elems
->ftie
;
189 if (os_memcmp(mic
, rx_ftie
->mic
, 16) == 0) {
190 add_note(wt
, MSG_DEBUG
, "TDLS: Valid MIC");
193 add_note(wt
, MSG_DEBUG
, "TDLS: Invalid MIC");
198 static void rx_data_tdls_setup_request(struct wlantest
*wt
, const u8
*bssid
,
199 const u8
*sta_addr
, const u8
*dst
,
201 const u8
*data
, size_t len
)
203 struct ieee802_11_elems elems
;
204 struct wlantest_tdls
*tdls
;
205 u8 linkid
[3 * ETH_ALEN
];
208 add_note(wt
, MSG_INFO
, "Too short TDLS Setup Request " MACSTR
209 " -> " MACSTR
, MAC2STR(src
), MAC2STR(dst
));
212 wpa_printf(MSG_DEBUG
, "TDLS Setup Request " MACSTR
" -> "
213 MACSTR
, MAC2STR(src
), MAC2STR(dst
));
215 if (ieee802_11_parse_elems(data
+ 3, len
- 3, &elems
, 1) ==
216 ParseFailed
|| elems
.link_id
== NULL
)
218 wpa_printf(MSG_DEBUG
, "TDLS Link Identifier: BSSID " MACSTR
219 " initiator STA " MACSTR
" responder STA " MACSTR
,
220 MAC2STR(elems
.link_id
), MAC2STR(elems
.link_id
+ ETH_ALEN
),
221 MAC2STR(elems
.link_id
+ 2 * ETH_ALEN
));
222 tdls
= get_tdls(wt
, elems
.link_id
, 1, bssid
);
224 tdls
->counters
[WLANTEST_TDLS_COUNTER_SETUP_REQ
]++;
225 tdls
->dialog_token
= data
[0];
226 if (elems
.ftie
&& elems
.ftie_len
>= sizeof(struct rsn_ftie
)) {
227 const struct rsn_ftie
*f
;
228 f
= (const struct rsn_ftie
*) elems
.ftie
;
229 os_memcpy(tdls
->inonce
, f
->snonce
, WPA_NONCE_LEN
);
233 /* Check whether reverse direction context exists already */
234 os_memcpy(linkid
, bssid
, ETH_ALEN
);
235 os_memcpy(linkid
+ ETH_ALEN
, dst
, ETH_ALEN
);
236 os_memcpy(linkid
+ 2 * ETH_ALEN
, src
, ETH_ALEN
);
237 tdls
= get_tdls(wt
, linkid
, 0, bssid
);
239 add_note(wt
, MSG_INFO
, "Reverse direction TDLS context exists");
243 static void rx_data_tdls_setup_response_failure(struct wlantest
*wt
,
246 u8 dialog_token
, u16 status
)
248 struct wlantest_bss
*bss
;
249 struct wlantest_tdls
*tdls
;
250 struct wlantest_sta
*sta
;
252 if (status
== WLAN_STATUS_SUCCESS
) {
253 add_note(wt
, MSG_INFO
, "TDLS: Invalid TDLS Setup Response from "
254 MACSTR
, MAC2STR(sta_addr
));
258 bss
= bss_find(wt
, bssid
);
261 sta
= sta_find(bss
, sta_addr
);
265 dl_list_for_each(tdls
, &bss
->tdls
, struct wlantest_tdls
, list
) {
266 if (tdls
->resp
== sta
) {
267 if (dialog_token
!= tdls
->dialog_token
) {
268 add_note(wt
, MSG_DEBUG
, "TDLS: Dialog token "
269 "mismatch in TDLS Setup Response "
273 add_note(wt
, MSG_DEBUG
, "TDLS: Found matching TDLS "
274 "setup session based on dialog token");
276 WLANTEST_TDLS_COUNTER_SETUP_RESP_FAIL
]++;
283 static void rx_data_tdls_setup_response(struct wlantest
*wt
, const u8
*bssid
,
284 const u8
*sta_addr
, const u8
*dst
,
286 const u8
*data
, size_t len
)
289 struct ieee802_11_elems elems
;
290 struct wlantest_tdls
*tdls
;
293 add_note(wt
, MSG_INFO
, "Too short TDLS Setup Response " MACSTR
294 " -> " MACSTR
, MAC2STR(src
), MAC2STR(dst
));
297 status
= WPA_GET_LE16(data
);
298 wpa_printf(MSG_DEBUG
, "TDLS Setup Response " MACSTR
" -> "
299 MACSTR
" (status %d)",
300 MAC2STR(src
), MAC2STR(dst
), status
);
301 if (len
< 5 && status
== 0) {
302 add_note(wt
, MSG_INFO
, "Too short TDLS Setup Response " MACSTR
303 " -> " MACSTR
, MAC2STR(src
), MAC2STR(dst
));
308 ieee802_11_parse_elems(data
+ 5, len
- 5, &elems
, 1) ==
309 ParseFailed
|| elems
.link_id
== NULL
) {
310 /* Need to match TDLS link based on Dialog Token */
311 rx_data_tdls_setup_response_failure(wt
, bssid
, sta_addr
,
315 wpa_printf(MSG_DEBUG
, "TDLS Link Identifier: BSSID " MACSTR
316 " initiator STA " MACSTR
" responder STA " MACSTR
,
317 MAC2STR(elems
.link_id
), MAC2STR(elems
.link_id
+ ETH_ALEN
),
318 MAC2STR(elems
.link_id
+ 2 * ETH_ALEN
));
320 tdls
= get_tdls(wt
, elems
.link_id
, 1, bssid
);
322 add_note(wt
, MSG_INFO
, "No match TDLS context found");
326 tdls
->counters
[WLANTEST_TDLS_COUNTER_SETUP_RESP_FAIL
]++;
328 tdls
->counters
[WLANTEST_TDLS_COUNTER_SETUP_RESP_OK
]++;
330 if (status
!= WLAN_STATUS_SUCCESS
)
333 if (elems
.ftie
&& elems
.ftie_len
>= sizeof(struct rsn_ftie
)) {
334 const struct rsn_ftie
*f
;
335 f
= (const struct rsn_ftie
*) elems
.ftie
;
336 if (os_memcmp(tdls
->inonce
, f
->snonce
, WPA_NONCE_LEN
) != 0) {
337 add_note(wt
, MSG_INFO
, "Mismatch in TDLS initiator "
340 os_memcpy(tdls
->rnonce
, f
->anonce
, WPA_NONCE_LEN
);
343 if (tdls_derive_tpk(tdls
, bssid
, elems
.ftie
, elems
.ftie_len
) < 1)
345 if (tdls_verify_mic(wt
, tdls
, 2, &elems
) == 0) {
346 tdls
->dialog_token
= data
[2];
347 add_note(wt
, MSG_DEBUG
, "TDLS: Dialog Token for the link: %u",
353 static void rx_data_tdls_setup_confirm_failure(struct wlantest
*wt
,
356 u8 dialog_token
, u16 status
)
358 struct wlantest_bss
*bss
;
359 struct wlantest_tdls
*tdls
;
360 struct wlantest_sta
*sta
;
362 if (status
== WLAN_STATUS_SUCCESS
) {
363 add_note(wt
, MSG_INFO
, "TDLS: Invalid TDLS Setup Confirm from "
364 MACSTR
, MAC2STR(src
));
368 bss
= bss_find(wt
, bssid
);
371 sta
= sta_find(bss
, src
);
375 dl_list_for_each(tdls
, &bss
->tdls
, struct wlantest_tdls
, list
) {
376 if (tdls
->init
== sta
) {
377 if (dialog_token
!= tdls
->dialog_token
) {
378 add_note(wt
, MSG_DEBUG
, "TDLS: Dialog token "
379 "mismatch in TDLS Setup Confirm "
383 add_note(wt
, MSG_DEBUG
, "TDLS: Found matching TDLS "
384 "setup session based on dialog token");
386 WLANTEST_TDLS_COUNTER_SETUP_CONF_FAIL
]++;
393 static void rx_data_tdls_setup_confirm(struct wlantest
*wt
, const u8
*bssid
,
394 const u8
*sta_addr
, const u8
*dst
,
396 const u8
*data
, size_t len
)
399 struct ieee802_11_elems elems
;
400 struct wlantest_tdls
*tdls
;
401 u8 link_id
[3 * ETH_ALEN
];
404 add_note(wt
, MSG_INFO
, "Too short TDLS Setup Confirm " MACSTR
405 " -> " MACSTR
, MAC2STR(src
), MAC2STR(dst
));
408 status
= WPA_GET_LE16(data
);
409 wpa_printf(MSG_DEBUG
, "TDLS Setup Confirm " MACSTR
" -> "
410 MACSTR
" (status %d)",
411 MAC2STR(src
), MAC2STR(dst
), status
);
413 if (ieee802_11_parse_elems(data
+ 3, len
- 3, &elems
, 1) ==
414 ParseFailed
|| elems
.link_id
== NULL
) {
415 /* Need to match TDLS link based on Dialog Token */
416 rx_data_tdls_setup_confirm_failure(wt
, bssid
, src
,
420 wpa_printf(MSG_DEBUG
, "TDLS Link Identifier: BSSID " MACSTR
421 " initiator STA " MACSTR
" responder STA " MACSTR
,
422 MAC2STR(elems
.link_id
), MAC2STR(elems
.link_id
+ ETH_ALEN
),
423 MAC2STR(elems
.link_id
+ 2 * ETH_ALEN
));
425 tdls
= get_tdls(wt
, elems
.link_id
, 1, bssid
);
429 tdls
->counters
[WLANTEST_TDLS_COUNTER_SETUP_CONF_FAIL
]++;
431 tdls
->counters
[WLANTEST_TDLS_COUNTER_SETUP_CONF_OK
]++;
433 if (status
!= WLAN_STATUS_SUCCESS
)
436 if (elems
.ftie
&& elems
.ftie_len
>= sizeof(struct rsn_ftie
)) {
437 const struct rsn_ftie
*f
;
438 f
= (const struct rsn_ftie
*) elems
.ftie
;
439 if (os_memcmp(tdls
->inonce
, f
->snonce
, WPA_NONCE_LEN
) != 0) {
440 add_note(wt
, MSG_INFO
, "Mismatch in TDLS initiator "
443 if (os_memcmp(tdls
->rnonce
, f
->anonce
, WPA_NONCE_LEN
) != 0) {
444 add_note(wt
, MSG_INFO
, "Mismatch in TDLS responder "
450 if (tdls_derive_tpk(tdls
, bssid
, elems
.ftie
, elems
.ftie_len
) < 1) {
451 if (elems
.ftie
== NULL
)
455 if (tdls_verify_mic(wt
, tdls
, 3, &elems
) == 0) {
456 tdls
->dialog_token
= data
[2];
457 add_note(wt
, MSG_DEBUG
, "TDLS: Link up - Dialog Token: %u",
463 * The TDLS link itself is bidirectional, but there is explicit
464 * initiator/responder roles. Remove the other direction of the link
465 * (if it exists) to make sure that the link counters are stored for
466 * the current TDLS entery.
468 os_memcpy(link_id
, elems
.link_id
, ETH_ALEN
);
469 os_memcpy(link_id
+ ETH_ALEN
, elems
.link_id
+ 2 * ETH_ALEN
, ETH_ALEN
);
470 os_memcpy(link_id
+ 2 * ETH_ALEN
, elems
.link_id
+ ETH_ALEN
, ETH_ALEN
);
471 tdls
= get_tdls(wt
, link_id
, 0, bssid
);
473 add_note(wt
, MSG_DEBUG
, "TDLS: Remove reverse link entry");
479 static int tdls_verify_mic_teardown(struct wlantest
*wt
,
480 struct wlantest_tdls
*tdls
, u8 trans_seq
,
481 const u8
*reason_code
,
482 struct ieee802_11_elems
*elems
)
488 const struct rsn_ftie
*rx_ftie
;
489 struct rsn_ftie
*tmp_ftie
;
491 if (elems
->link_id
== NULL
|| elems
->ftie
== NULL
)
494 len
= 2 + 18 + 2 + 1 + 1 + 2 + elems
->ftie_len
;
496 buf
= os_zalloc(len
);
501 /* 1) Link Identifier IE */
502 os_memcpy(pos
, elems
->link_id
- 2, 2 + 18);
505 os_memcpy(pos
, reason_code
, 2);
507 /* 3) Dialog token */
508 *pos
++ = tdls
->dialog_token
;
509 /* 4) Transaction Sequence number */
511 /* 5) FTIE, with the MIC field of the FTIE set to 0 */
512 os_memcpy(pos
, elems
->ftie
- 2, 2 + elems
->ftie_len
);
514 tmp_ftie
= (struct rsn_ftie
*) pos
;
515 os_memset(tmp_ftie
->mic
, 0, 16);
516 pos
+= elems
->ftie_len
;
518 wpa_hexdump(MSG_DEBUG
, "TDLS: Data for FTIE MIC", buf
, pos
- buf
);
519 wpa_hexdump_key(MSG_DEBUG
, "TDLS: KCK", tdls
->tpk
.kck
, 16);
520 ret
= omac1_aes_128(tdls
->tpk
.kck
, buf
, pos
- buf
, mic
);
524 wpa_hexdump(MSG_DEBUG
, "TDLS: FTIE MIC", mic
, 16);
525 rx_ftie
= (const struct rsn_ftie
*) elems
->ftie
;
527 if (os_memcmp(mic
, rx_ftie
->mic
, 16) == 0) {
528 add_note(wt
, MSG_DEBUG
, "TDLS: Valid MIC");
531 add_note(wt
, MSG_DEBUG
, "TDLS: Invalid MIC");
536 static void rx_data_tdls_teardown(struct wlantest
*wt
, const u8
*bssid
,
537 const u8
*sta_addr
, const u8
*dst
,
539 const u8
*data
, size_t len
)
542 struct ieee802_11_elems elems
;
543 struct wlantest_tdls
*tdls
;
547 reason
= WPA_GET_LE16(data
);
548 wpa_printf(MSG_DEBUG
, "TDLS Teardown " MACSTR
" -> "
549 MACSTR
" (reason %d)",
550 MAC2STR(src
), MAC2STR(dst
), reason
);
552 if (ieee802_11_parse_elems(data
+ 2, len
- 2, &elems
, 1) ==
553 ParseFailed
|| elems
.link_id
== NULL
)
555 wpa_printf(MSG_DEBUG
, "TDLS Link Identifier: BSSID " MACSTR
556 " initiator STA " MACSTR
" responder STA " MACSTR
,
557 MAC2STR(elems
.link_id
), MAC2STR(elems
.link_id
+ ETH_ALEN
),
558 MAC2STR(elems
.link_id
+ 2 * ETH_ALEN
));
560 tdls
= get_tdls(wt
, elems
.link_id
, 1, bssid
);
563 add_note(wt
, MSG_DEBUG
, "TDLS: Link down");
565 tdls
->counters
[WLANTEST_TDLS_COUNTER_TEARDOWN
]++;
566 tdls_verify_mic_teardown(wt
, tdls
, 4, data
, &elems
);
571 static void rx_data_tdls(struct wlantest
*wt
, const u8
*bssid
,
572 const u8
*sta_addr
, const u8
*dst
, const u8
*src
,
573 const u8
*data
, size_t len
)
575 /* data contains the payload of a TDLS Action frame */
576 if (len
< 2 || data
[0] != WLAN_ACTION_TDLS
) {
577 wpa_hexdump(MSG_DEBUG
, "Unrecognized encapsulated TDLS frame",
583 case WLAN_TDLS_SETUP_REQUEST
:
584 rx_data_tdls_setup_request(wt
, bssid
, sta_addr
, dst
, src
,
587 case WLAN_TDLS_SETUP_RESPONSE
:
588 rx_data_tdls_setup_response(wt
, bssid
, sta_addr
, dst
, src
,
591 case WLAN_TDLS_SETUP_CONFIRM
:
592 rx_data_tdls_setup_confirm(wt
, bssid
, sta_addr
, dst
, src
,
595 case WLAN_TDLS_TEARDOWN
:
596 rx_data_tdls_teardown(wt
, bssid
, sta_addr
, dst
, src
, data
+ 2,
599 case WLAN_TDLS_DISCOVERY_REQUEST
:
600 wpa_printf(MSG_DEBUG
, "TDLS Discovery Request " MACSTR
" -> "
601 MACSTR
, MAC2STR(src
), MAC2STR(dst
));
607 void rx_data_80211_encap(struct wlantest
*wt
, const u8
*bssid
,
608 const u8
*sta_addr
, const u8
*dst
, const u8
*src
,
609 const u8
*data
, size_t len
)
611 wpa_hexdump(MSG_EXCESSIVE
, "802.11 data encap frame", data
, len
);
615 rx_data_tdls(wt
, bssid
, sta_addr
, dst
, src
, data
+ 1, len
- 1);