2 * Received Data frame processing
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"
10 #include <linux/if_ether.h>
12 #include "utils/common.h"
13 #include "common/defs.h"
14 #include "common/ieee802_11_defs.h"
18 static const char * data_stype(u16 stype
)
21 case WLAN_FC_STYPE_DATA
:
23 case WLAN_FC_STYPE_DATA_CFACK
:
25 case WLAN_FC_STYPE_DATA_CFPOLL
:
27 case WLAN_FC_STYPE_DATA_CFACKPOLL
:
28 return "DATA-CFACKPOLL";
29 case WLAN_FC_STYPE_NULLFUNC
:
31 case WLAN_FC_STYPE_CFACK
:
33 case WLAN_FC_STYPE_CFPOLL
:
35 case WLAN_FC_STYPE_CFACKPOLL
:
37 case WLAN_FC_STYPE_QOS_DATA
:
39 case WLAN_FC_STYPE_QOS_DATA_CFACK
:
40 return "QOSDATA-CFACK";
41 case WLAN_FC_STYPE_QOS_DATA_CFPOLL
:
42 return "QOSDATA-CFPOLL";
43 case WLAN_FC_STYPE_QOS_DATA_CFACKPOLL
:
44 return "QOSDATA-CFACKPOLL";
45 case WLAN_FC_STYPE_QOS_NULL
:
47 case WLAN_FC_STYPE_QOS_CFPOLL
:
49 case WLAN_FC_STYPE_QOS_CFACKPOLL
:
50 return "QOS-CFACKPOLL";
56 static void rx_data_eth(struct wlantest
*wt
, const u8
*bssid
,
57 const u8
*sta_addr
, const u8
*dst
, const u8
*src
,
58 u16 ethertype
, const u8
*data
, size_t len
, int prot
,
63 rx_data_eapol(wt
, dst
, src
, data
, len
, prot
);
66 rx_data_ip(wt
, bssid
, sta_addr
, dst
, src
, data
, len
,
70 rx_data_80211_encap(wt
, bssid
, sta_addr
, dst
, src
, data
, len
);
76 static void rx_data_process(struct wlantest
*wt
, const u8
*bssid
,
78 const u8
*dst
, const u8
*src
,
79 const u8
*data
, size_t len
, int prot
,
85 if (len
>= 8 && os_memcmp(data
, "\xaa\xaa\x03\x00\x00\x00", 6) == 0) {
86 rx_data_eth(wt
, bssid
, sta_addr
, dst
, src
,
87 WPA_GET_BE16(data
+ 6), data
+ 8, len
- 8, prot
,
92 wpa_hexdump(MSG_DEBUG
, "Unrecognized LLC", data
, len
> 8 ? 8 : len
);
96 static void rx_data_bss_prot_group(struct wlantest
*wt
,
97 const struct ieee80211_hdr
*hdr
,
98 const u8
*qos
, const u8
*dst
, const u8
*src
,
99 const u8
*data
, size_t len
)
101 struct wlantest_bss
*bss
;
107 bss
= bss_get(wt
, hdr
->addr2
);
111 add_note(wt
, MSG_INFO
, "Too short group addressed data frame");
115 if (bss
->group_cipher
& (WPA_CIPHER_TKIP
| WPA_CIPHER_CCMP
) &&
117 add_note(wt
, MSG_INFO
, "Expected TKIP/CCMP frame from "
118 MACSTR
" did not have ExtIV bit set to 1",
119 MAC2STR(bss
->bssid
));
123 if (bss
->group_cipher
== WPA_CIPHER_TKIP
) {
124 if (data
[3] & 0x1f) {
125 add_note(wt
, MSG_INFO
, "TKIP frame from " MACSTR
126 " used non-zero reserved bit",
127 MAC2STR(bss
->bssid
));
129 if (data
[1] != ((data
[0] | 0x20) & 0x7f)) {
130 add_note(wt
, MSG_INFO
, "TKIP frame from " MACSTR
131 " used incorrect WEPSeed[1] (was 0x%x, "
133 MAC2STR(bss
->bssid
), data
[1],
134 (data
[0] | 0x20) & 0x7f);
136 } else if (bss
->group_cipher
== WPA_CIPHER_CCMP
) {
137 if (data
[2] != 0 || (data
[3] & 0x1f) != 0) {
138 add_note(wt
, MSG_INFO
, "CCMP frame from " MACSTR
139 " used non-zero reserved bit",
140 MAC2STR(bss
->bssid
));
144 keyid
= data
[3] >> 6;
145 if (bss
->gtk_len
[keyid
] == 0 && bss
->group_cipher
!= WPA_CIPHER_WEP40
)
147 add_note(wt
, MSG_MSGDUMP
, "No GTK known to decrypt the frame "
148 "(A2=" MACSTR
" KeyID=%d)",
149 MAC2STR(hdr
->addr2
), keyid
);
153 if (bss
->group_cipher
== WPA_CIPHER_TKIP
)
154 tkip_get_pn(pn
, data
);
155 else if (bss
->group_cipher
== WPA_CIPHER_WEP40
)
156 goto skip_replay_det
;
158 ccmp_get_pn(pn
, data
);
159 if (os_memcmp(pn
, bss
->rsc
[keyid
], 6) <= 0) {
160 u16 seq_ctrl
= le_to_host16(hdr
->seq_ctrl
);
161 add_note(wt
, MSG_INFO
, "CCMP/TKIP replay detected: A1=" MACSTR
162 " A2=" MACSTR
" A3=" MACSTR
" seq=%u frag=%u",
163 MAC2STR(hdr
->addr1
), MAC2STR(hdr
->addr2
),
165 WLAN_GET_SEQ_SEQ(seq_ctrl
),
166 WLAN_GET_SEQ_FRAG(seq_ctrl
));
167 wpa_hexdump(MSG_INFO
, "RX PN", pn
, 6);
168 wpa_hexdump(MSG_INFO
, "RSC", bss
->rsc
[keyid
], 6);
172 if (bss
->group_cipher
== WPA_CIPHER_TKIP
)
173 decrypted
= tkip_decrypt(bss
->gtk
[keyid
], hdr
, data
, len
,
175 else if (bss
->group_cipher
== WPA_CIPHER_WEP40
)
176 decrypted
= wep_decrypt(wt
, hdr
, data
, len
, &dlen
);
178 decrypted
= ccmp_decrypt(bss
->gtk
[keyid
], hdr
, data
, len
,
181 rx_data_process(wt
, bss
->bssid
, NULL
, dst
, src
, decrypted
,
183 os_memcpy(bss
->rsc
[keyid
], pn
, 6);
184 write_pcap_decrypted(wt
, (const u8
*) hdr
, 24 + (qos
? 2 : 0),
187 add_note(wt
, MSG_DEBUG
, "Failed to decrypt frame");
192 static void rx_data_bss_prot(struct wlantest
*wt
,
193 const struct ieee80211_hdr
*hdr
, const u8
*qos
,
194 const u8
*dst
, const u8
*src
, const u8
*data
,
197 struct wlantest_bss
*bss
;
198 struct wlantest_sta
*sta
, *sta2
;
200 u16 fc
= le_to_host16(hdr
->frame_control
);
205 struct wlantest_tdls
*tdls
= NULL
, *found
;
208 if (hdr
->addr1
[0] & 0x01) {
209 rx_data_bss_prot_group(wt
, hdr
, qos
, dst
, src
, data
, len
);
213 if (fc
& WLAN_FC_TODS
) {
214 bss
= bss_get(wt
, hdr
->addr1
);
217 sta
= sta_get(bss
, hdr
->addr2
);
219 sta
->counters
[WLANTEST_STA_COUNTER_PROT_DATA_TX
]++;
220 } else if (fc
& WLAN_FC_FROMDS
) {
221 bss
= bss_get(wt
, hdr
->addr2
);
224 sta
= sta_get(bss
, hdr
->addr1
);
226 bss
= bss_get(wt
, hdr
->addr3
);
229 sta
= sta_find(bss
, hdr
->addr2
);
230 sta2
= sta_find(bss
, hdr
->addr1
);
231 if (sta
== NULL
|| sta2
== NULL
)
234 dl_list_for_each(tdls
, &bss
->tdls
, struct wlantest_tdls
, list
)
236 if ((tdls
->init
== sta
&& tdls
->resp
== sta2
) ||
237 (tdls
->init
== sta2
&& tdls
->resp
== sta
)) {
245 add_note(wt
, MSG_DEBUG
,
246 "TDLS: Link not up, but Data "
253 (!sta
->ptk_set
&& sta
->pairwise_cipher
!= WPA_CIPHER_WEP40
)) &&
255 add_note(wt
, MSG_MSGDUMP
, "No PTK known to decrypt the frame");
260 add_note(wt
, MSG_INFO
, "Too short encrypted data frame");
264 if (sta
->pairwise_cipher
& (WPA_CIPHER_TKIP
| WPA_CIPHER_CCMP
) &&
266 add_note(wt
, MSG_INFO
, "Expected TKIP/CCMP frame from "
267 MACSTR
" did not have ExtIV bit set to 1",
272 if (tk
== NULL
&& sta
->pairwise_cipher
== WPA_CIPHER_TKIP
) {
273 if (data
[3] & 0x1f) {
274 add_note(wt
, MSG_INFO
, "TKIP frame from " MACSTR
275 " used non-zero reserved bit",
276 MAC2STR(hdr
->addr2
));
278 if (data
[1] != ((data
[0] | 0x20) & 0x7f)) {
279 add_note(wt
, MSG_INFO
, "TKIP frame from " MACSTR
280 " used incorrect WEPSeed[1] (was 0x%x, "
282 MAC2STR(hdr
->addr2
), data
[1],
283 (data
[0] | 0x20) & 0x7f);
285 } else if (tk
|| sta
->pairwise_cipher
== WPA_CIPHER_CCMP
) {
286 if (data
[2] != 0 || (data
[3] & 0x1f) != 0) {
287 add_note(wt
, MSG_INFO
, "CCMP frame from " MACSTR
288 " used non-zero reserved bit",
289 MAC2STR(hdr
->addr2
));
293 keyid
= data
[3] >> 6;
295 add_note(wt
, MSG_INFO
, "Unexpected non-zero KeyID %d in "
296 "individually addressed Data frame from " MACSTR
,
297 keyid
, MAC2STR(hdr
->addr2
));
305 if (os_memcmp(hdr
->addr2
, tdls
->init
->addr
, ETH_ALEN
) == 0)
306 rsc
= tdls
->rsc_init
[tid
];
308 rsc
= tdls
->rsc_resp
[tid
];
309 } else if (fc
& WLAN_FC_TODS
)
310 rsc
= sta
->rsc_tods
[tid
];
312 rsc
= sta
->rsc_fromds
[tid
];
315 if (tk
== NULL
&& sta
->pairwise_cipher
== WPA_CIPHER_TKIP
)
316 tkip_get_pn(pn
, data
);
317 else if (sta
->pairwise_cipher
== WPA_CIPHER_WEP40
)
318 goto skip_replay_det
;
320 ccmp_get_pn(pn
, data
);
321 if (os_memcmp(pn
, rsc
, 6) <= 0) {
322 u16 seq_ctrl
= le_to_host16(hdr
->seq_ctrl
);
323 add_note(wt
, MSG_INFO
, "CCMP/TKIP replay detected: A1=" MACSTR
324 " A2=" MACSTR
" A3=" MACSTR
" seq=%u frag=%u",
325 MAC2STR(hdr
->addr1
), MAC2STR(hdr
->addr2
),
327 WLAN_GET_SEQ_SEQ(seq_ctrl
),
328 WLAN_GET_SEQ_FRAG(seq_ctrl
));
329 wpa_hexdump(MSG_INFO
, "RX PN", pn
, 6);
330 wpa_hexdump(MSG_INFO
, "RSC", rsc
, 6);
335 decrypted
= ccmp_decrypt(tk
, hdr
, data
, len
, &dlen
);
336 else if (sta
->pairwise_cipher
== WPA_CIPHER_TKIP
)
337 decrypted
= tkip_decrypt(sta
->ptk
.tk1
, hdr
, data
, len
, &dlen
);
338 else if (sta
->pairwise_cipher
== WPA_CIPHER_WEP40
)
339 decrypted
= wep_decrypt(wt
, hdr
, data
, len
, &dlen
);
341 decrypted
= ccmp_decrypt(sta
->ptk
.tk1
, hdr
, data
, len
, &dlen
);
343 u16 fc
= le_to_host16(hdr
->frame_control
);
344 const u8
*peer_addr
= NULL
;
345 if (!(fc
& (WLAN_FC_FROMDS
| WLAN_FC_TODS
)))
346 peer_addr
= hdr
->addr1
;
347 os_memcpy(rsc
, pn
, 6);
348 rx_data_process(wt
, bss
->bssid
, sta
->addr
, dst
, src
, decrypted
,
350 write_pcap_decrypted(wt
, (const u8
*) hdr
, 24 + (qos
? 2 : 0),
353 add_note(wt
, MSG_DEBUG
, "Failed to decrypt frame");
358 static void rx_data_bss(struct wlantest
*wt
, const struct ieee80211_hdr
*hdr
,
359 const u8
*qos
, const u8
*dst
, const u8
*src
,
360 const u8
*data
, size_t len
)
362 u16 fc
= le_to_host16(hdr
->frame_control
);
363 int prot
= !!(fc
& WLAN_FC_ISWEP
);
366 u8 ack
= (qos
[0] & 0x60) >> 5;
367 wpa_printf(MSG_MSGDUMP
, "BSS DATA: " MACSTR
" -> " MACSTR
368 " len=%u%s tid=%u%s%s",
369 MAC2STR(src
), MAC2STR(dst
), (unsigned int) len
,
370 prot
? " Prot" : "", qos
[0] & 0x0f,
371 (qos
[0] & 0x10) ? " EOSP" : "",
373 (ack
== 1 ? " NoAck" :
374 (ack
== 2 ? " NoExpAck" : " BA")));
376 wpa_printf(MSG_MSGDUMP
, "BSS DATA: " MACSTR
" -> " MACSTR
378 MAC2STR(src
), MAC2STR(dst
), (unsigned int) len
,
379 prot
? " Prot" : "");
383 rx_data_bss_prot(wt
, hdr
, qos
, dst
, src
, data
, len
);
385 const u8
*bssid
, *sta_addr
, *peer_addr
;
386 if (fc
& WLAN_FC_TODS
) {
388 sta_addr
= hdr
->addr2
;
390 } else if (fc
& WLAN_FC_FROMDS
) {
392 sta_addr
= hdr
->addr1
;
396 sta_addr
= hdr
->addr2
;
397 peer_addr
= hdr
->addr1
;
399 rx_data_process(wt
, bssid
, sta_addr
, dst
, src
, data
, len
, 0,
405 static struct wlantest_tdls
* get_tdls(struct wlantest
*wt
, const u8
*bssid
,
409 struct wlantest_bss
*bss
;
410 struct wlantest_sta
*sta1
, *sta2
;
411 struct wlantest_tdls
*tdls
, *found
= NULL
;
413 bss
= bss_find(wt
, bssid
);
416 sta1
= sta_find(bss
, sta1_addr
);
419 sta2
= sta_find(bss
, sta2_addr
);
423 dl_list_for_each(tdls
, &bss
->tdls
, struct wlantest_tdls
, list
) {
424 if ((tdls
->init
== sta1
&& tdls
->resp
== sta2
) ||
425 (tdls
->init
== sta2
&& tdls
->resp
== sta1
)) {
436 static void add_direct_link(struct wlantest
*wt
, const u8
*bssid
,
437 const u8
*sta1_addr
, const u8
*sta2_addr
)
439 struct wlantest_tdls
*tdls
;
441 tdls
= get_tdls(wt
, bssid
, sta1_addr
, sta2_addr
);
446 tdls
->counters
[WLANTEST_TDLS_COUNTER_VALID_DIRECT_LINK
]++;
448 tdls
->counters
[WLANTEST_TDLS_COUNTER_INVALID_DIRECT_LINK
]++;
452 static void add_ap_path(struct wlantest
*wt
, const u8
*bssid
,
453 const u8
*sta1_addr
, const u8
*sta2_addr
)
455 struct wlantest_tdls
*tdls
;
457 tdls
= get_tdls(wt
, bssid
, sta1_addr
, sta2_addr
);
462 tdls
->counters
[WLANTEST_TDLS_COUNTER_INVALID_AP_PATH
]++;
464 tdls
->counters
[WLANTEST_TDLS_COUNTER_VALID_AP_PATH
]++;
468 void rx_data(struct wlantest
*wt
, const u8
*data
, size_t len
)
470 const struct ieee80211_hdr
*hdr
;
473 const u8
*qos
= NULL
;
478 hdr
= (const struct ieee80211_hdr
*) data
;
479 fc
= le_to_host16(hdr
->frame_control
);
480 stype
= WLAN_FC_GET_STYPE(fc
);
482 if ((fc
& (WLAN_FC_TODS
| WLAN_FC_FROMDS
)) ==
483 (WLAN_FC_TODS
| WLAN_FC_FROMDS
))
493 switch (fc
& (WLAN_FC_TODS
| WLAN_FC_FROMDS
)) {
495 wpa_printf(MSG_EXCESSIVE
, "DATA %s%s%s IBSS DA=" MACSTR
" SA="
496 MACSTR
" BSSID=" MACSTR
,
497 data_stype(WLAN_FC_GET_STYPE(fc
)),
498 fc
& WLAN_FC_PWRMGT
? " PwrMgt" : "",
499 fc
& WLAN_FC_ISWEP
? " Prot" : "",
500 MAC2STR(hdr
->addr1
), MAC2STR(hdr
->addr2
),
501 MAC2STR(hdr
->addr3
));
502 add_direct_link(wt
, hdr
->addr3
, hdr
->addr1
, hdr
->addr2
);
503 rx_data_bss(wt
, hdr
, qos
, hdr
->addr1
, hdr
->addr2
,
504 data
+ hdrlen
, len
- hdrlen
);
507 wpa_printf(MSG_EXCESSIVE
, "DATA %s%s%s FromDS DA=" MACSTR
508 " BSSID=" MACSTR
" SA=" MACSTR
,
509 data_stype(WLAN_FC_GET_STYPE(fc
)),
510 fc
& WLAN_FC_PWRMGT
? " PwrMgt" : "",
511 fc
& WLAN_FC_ISWEP
? " Prot" : "",
512 MAC2STR(hdr
->addr1
), MAC2STR(hdr
->addr2
),
513 MAC2STR(hdr
->addr3
));
514 add_ap_path(wt
, hdr
->addr2
, hdr
->addr1
, hdr
->addr3
);
515 rx_data_bss(wt
, hdr
, qos
, hdr
->addr1
, hdr
->addr3
,
516 data
+ hdrlen
, len
- hdrlen
);
519 wpa_printf(MSG_EXCESSIVE
, "DATA %s%s%s ToDS BSSID=" MACSTR
520 " SA=" MACSTR
" DA=" MACSTR
,
521 data_stype(WLAN_FC_GET_STYPE(fc
)),
522 fc
& WLAN_FC_PWRMGT
? " PwrMgt" : "",
523 fc
& WLAN_FC_ISWEP
? " Prot" : "",
524 MAC2STR(hdr
->addr1
), MAC2STR(hdr
->addr2
),
525 MAC2STR(hdr
->addr3
));
526 add_ap_path(wt
, hdr
->addr1
, hdr
->addr3
, hdr
->addr2
);
527 rx_data_bss(wt
, hdr
, qos
, hdr
->addr3
, hdr
->addr2
,
528 data
+ hdrlen
, len
- hdrlen
);
530 case WLAN_FC_TODS
| WLAN_FC_FROMDS
:
531 wpa_printf(MSG_EXCESSIVE
, "DATA %s%s%s WDS RA=" MACSTR
" TA="
532 MACSTR
" DA=" MACSTR
" SA=" MACSTR
,
533 data_stype(WLAN_FC_GET_STYPE(fc
)),
534 fc
& WLAN_FC_PWRMGT
? " PwrMgt" : "",
535 fc
& WLAN_FC_ISWEP
? " Prot" : "",
536 MAC2STR(hdr
->addr1
), MAC2STR(hdr
->addr2
),
538 MAC2STR((const u8
*) (hdr
+ 1)));