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)));