]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * Received Data frame processing | |
3 | * Copyright (c) 2010-2015, Jouni Malinen <j@w1.fi> | |
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 "common/defs.h" | |
13 | #include "common/ieee802_11_defs.h" | |
14 | #include "wlantest.h" | |
15 | ||
16 | ||
17 | static const char * data_stype(u16 stype) | |
18 | { | |
19 | switch (stype) { | |
20 | case WLAN_FC_STYPE_DATA: | |
21 | return "DATA"; | |
22 | case WLAN_FC_STYPE_DATA_CFACK: | |
23 | return "DATA-CFACK"; | |
24 | case WLAN_FC_STYPE_DATA_CFPOLL: | |
25 | return "DATA-CFPOLL"; | |
26 | case WLAN_FC_STYPE_DATA_CFACKPOLL: | |
27 | return "DATA-CFACKPOLL"; | |
28 | case WLAN_FC_STYPE_NULLFUNC: | |
29 | return "NULLFUNC"; | |
30 | case WLAN_FC_STYPE_CFACK: | |
31 | return "CFACK"; | |
32 | case WLAN_FC_STYPE_CFPOLL: | |
33 | return "CFPOLL"; | |
34 | case WLAN_FC_STYPE_CFACKPOLL: | |
35 | return "CFACKPOLL"; | |
36 | case WLAN_FC_STYPE_QOS_DATA: | |
37 | return "QOSDATA"; | |
38 | case WLAN_FC_STYPE_QOS_DATA_CFACK: | |
39 | return "QOSDATA-CFACK"; | |
40 | case WLAN_FC_STYPE_QOS_DATA_CFPOLL: | |
41 | return "QOSDATA-CFPOLL"; | |
42 | case WLAN_FC_STYPE_QOS_DATA_CFACKPOLL: | |
43 | return "QOSDATA-CFACKPOLL"; | |
44 | case WLAN_FC_STYPE_QOS_NULL: | |
45 | return "QOS-NULL"; | |
46 | case WLAN_FC_STYPE_QOS_CFPOLL: | |
47 | return "QOS-CFPOLL"; | |
48 | case WLAN_FC_STYPE_QOS_CFACKPOLL: | |
49 | return "QOS-CFACKPOLL"; | |
50 | } | |
51 | return "??"; | |
52 | } | |
53 | ||
54 | ||
55 | static void rx_data_eth(struct wlantest *wt, const u8 *bssid, | |
56 | const u8 *sta_addr, const u8 *dst, const u8 *src, | |
57 | u16 ethertype, const u8 *data, size_t len, int prot, | |
58 | const u8 *peer_addr); | |
59 | ||
60 | static void rx_data_vlan(struct wlantest *wt, const u8 *bssid, | |
61 | const u8 *sta_addr, const u8 *dst, const u8 *src, | |
62 | const u8 *data, size_t len, int prot, | |
63 | const u8 *peer_addr) | |
64 | { | |
65 | u16 tag; | |
66 | ||
67 | if (len < 4) | |
68 | return; | |
69 | tag = WPA_GET_BE16(data); | |
70 | wpa_printf(MSG_MSGDUMP, "VLAN tag: Priority=%u ID=%u", | |
71 | tag >> 12, tag & 0x0ffff); | |
72 | /* ignore VLAN information and process the original frame */ | |
73 | rx_data_eth(wt, bssid, sta_addr, dst, src, WPA_GET_BE16(data + 2), | |
74 | data + 4, len - 4, prot, peer_addr); | |
75 | } | |
76 | ||
77 | ||
78 | static void rx_data_eth(struct wlantest *wt, const u8 *bssid, | |
79 | const u8 *sta_addr, const u8 *dst, const u8 *src, | |
80 | u16 ethertype, const u8 *data, size_t len, int prot, | |
81 | const u8 *peer_addr) | |
82 | { | |
83 | switch (ethertype) { | |
84 | case ETH_P_PAE: | |
85 | rx_data_eapol(wt, bssid, sta_addr, dst, src, data, len, prot); | |
86 | break; | |
87 | case ETH_P_IP: | |
88 | rx_data_ip(wt, bssid, sta_addr, dst, src, data, len, | |
89 | peer_addr); | |
90 | break; | |
91 | case 0x890d: | |
92 | rx_data_80211_encap(wt, bssid, sta_addr, dst, src, data, len); | |
93 | break; | |
94 | case ETH_P_8021Q: | |
95 | rx_data_vlan(wt, bssid, sta_addr, dst, src, data, len, prot, | |
96 | peer_addr); | |
97 | break; | |
98 | } | |
99 | } | |
100 | ||
101 | ||
102 | static void rx_data_process(struct wlantest *wt, const u8 *bssid, | |
103 | const u8 *sta_addr, | |
104 | const u8 *dst, const u8 *src, | |
105 | const u8 *data, size_t len, int prot, | |
106 | const u8 *peer_addr) | |
107 | { | |
108 | if (len == 0) | |
109 | return; | |
110 | ||
111 | if (len >= 8 && os_memcmp(data, "\xaa\xaa\x03\x00\x00\x00", 6) == 0) { | |
112 | rx_data_eth(wt, bssid, sta_addr, dst, src, | |
113 | WPA_GET_BE16(data + 6), data + 8, len - 8, prot, | |
114 | peer_addr); | |
115 | return; | |
116 | } | |
117 | ||
118 | wpa_hexdump(MSG_DEBUG, "Unrecognized LLC", data, len > 8 ? 8 : len); | |
119 | } | |
120 | ||
121 | ||
122 | static void write_decrypted_note(struct wlantest *wt, const u8 *decrypted, | |
123 | const u8 *tk, size_t tk_len, int keyid) | |
124 | { | |
125 | char tk_hex[65]; | |
126 | ||
127 | if (!decrypted) | |
128 | return; | |
129 | ||
130 | wpa_snprintf_hex(tk_hex, sizeof(tk_hex), tk, tk_len); | |
131 | add_note(wt, MSG_EXCESSIVE, "TK[%d] %s", keyid, tk_hex); | |
132 | } | |
133 | ||
134 | ||
135 | static u8 * try_ptk(int pairwise_cipher, struct wpa_ptk *ptk, | |
136 | const struct ieee80211_hdr *hdr, | |
137 | const u8 *data, size_t data_len, size_t *decrypted_len) | |
138 | { | |
139 | u8 *decrypted; | |
140 | unsigned int tk_len = ptk->tk_len; | |
141 | ||
142 | decrypted = NULL; | |
143 | if ((pairwise_cipher == WPA_CIPHER_CCMP || | |
144 | pairwise_cipher == 0) && tk_len == 16) { | |
145 | decrypted = ccmp_decrypt(ptk->tk, hdr, data, | |
146 | data_len, decrypted_len); | |
147 | } else if ((pairwise_cipher == WPA_CIPHER_CCMP_256 || | |
148 | pairwise_cipher == 0) && tk_len == 32) { | |
149 | decrypted = ccmp_256_decrypt(ptk->tk, hdr, data, | |
150 | data_len, decrypted_len); | |
151 | } else if ((pairwise_cipher == WPA_CIPHER_GCMP || | |
152 | pairwise_cipher == WPA_CIPHER_GCMP_256 || | |
153 | pairwise_cipher == 0) && | |
154 | (tk_len == 16 || tk_len == 32)) { | |
155 | decrypted = gcmp_decrypt(ptk->tk, tk_len, hdr, | |
156 | data, data_len, decrypted_len); | |
157 | } else if ((pairwise_cipher == WPA_CIPHER_TKIP || | |
158 | pairwise_cipher == 0) && tk_len == 32) { | |
159 | decrypted = tkip_decrypt(ptk->tk, hdr, data, data_len, | |
160 | decrypted_len); | |
161 | } | |
162 | ||
163 | return decrypted; | |
164 | } | |
165 | ||
166 | ||
167 | static u8 * try_all_ptk(struct wlantest *wt, int pairwise_cipher, | |
168 | const struct ieee80211_hdr *hdr, int keyid, | |
169 | const u8 *data, size_t data_len, size_t *decrypted_len) | |
170 | { | |
171 | struct wlantest_ptk *ptk; | |
172 | u8 *decrypted; | |
173 | int prev_level = wpa_debug_level; | |
174 | ||
175 | wpa_debug_level = MSG_WARNING; | |
176 | dl_list_for_each(ptk, &wt->ptk, struct wlantest_ptk, list) { | |
177 | decrypted = try_ptk(pairwise_cipher, &ptk->ptk, hdr, | |
178 | data, data_len, decrypted_len); | |
179 | if (decrypted) { | |
180 | wpa_debug_level = prev_level; | |
181 | add_note(wt, MSG_DEBUG, | |
182 | "Found PTK match from list of all known PTKs"); | |
183 | write_decrypted_note(wt, decrypted, ptk->ptk.tk, | |
184 | ptk->ptk.tk_len, keyid); | |
185 | return decrypted; | |
186 | } | |
187 | } | |
188 | wpa_debug_level = prev_level; | |
189 | ||
190 | return NULL; | |
191 | } | |
192 | ||
193 | ||
194 | static void check_plaintext_prot(struct wlantest *wt, | |
195 | const struct ieee80211_hdr *hdr, | |
196 | const u8 *data, size_t len) | |
197 | { | |
198 | if (len < 8 + 3 || data[8] != 0xaa || data[9] != 0xaa || | |
199 | data[10] != 0x03) | |
200 | return; | |
201 | ||
202 | add_note(wt, MSG_DEBUG, | |
203 | "Plaintext payload in protected frame"); | |
204 | wpa_printf(MSG_INFO, "Plaintext payload in protected frame #%u: A2=" | |
205 | MACSTR " seq=%u", | |
206 | wt->frame_num, MAC2STR(hdr->addr2), | |
207 | WLAN_GET_SEQ_SEQ(le_to_host16(hdr->seq_ctrl))); | |
208 | } | |
209 | ||
210 | ||
211 | static void rx_data_bss_prot_group(struct wlantest *wt, | |
212 | const struct ieee80211_hdr *hdr, | |
213 | size_t hdrlen, | |
214 | const u8 *qos, const u8 *dst, const u8 *src, | |
215 | const u8 *data, size_t len) | |
216 | { | |
217 | struct wlantest_bss *bss; | |
218 | int keyid; | |
219 | u8 *decrypted = NULL; | |
220 | size_t dlen; | |
221 | u8 pn[6]; | |
222 | int replay = 0; | |
223 | ||
224 | bss = bss_get(wt, hdr->addr2); | |
225 | if (bss == NULL) | |
226 | return; | |
227 | if (len < 4) { | |
228 | add_note(wt, MSG_INFO, "Too short group addressed data frame"); | |
229 | return; | |
230 | } | |
231 | ||
232 | if (bss->group_cipher & (WPA_CIPHER_TKIP | WPA_CIPHER_CCMP) && | |
233 | !(data[3] & 0x20)) { | |
234 | add_note(wt, MSG_INFO, "Expected TKIP/CCMP frame from " | |
235 | MACSTR " did not have ExtIV bit set to 1", | |
236 | MAC2STR(bss->bssid)); | |
237 | return; | |
238 | } | |
239 | ||
240 | if (bss->group_cipher == WPA_CIPHER_TKIP) { | |
241 | if (data[3] & 0x1f) { | |
242 | add_note(wt, MSG_INFO, "TKIP frame from " MACSTR | |
243 | " used non-zero reserved bit", | |
244 | MAC2STR(bss->bssid)); | |
245 | } | |
246 | if (data[1] != ((data[0] | 0x20) & 0x7f)) { | |
247 | add_note(wt, MSG_INFO, "TKIP frame from " MACSTR | |
248 | " used incorrect WEPSeed[1] (was 0x%x, " | |
249 | "expected 0x%x)", | |
250 | MAC2STR(bss->bssid), data[1], | |
251 | (data[0] | 0x20) & 0x7f); | |
252 | } | |
253 | } else if (bss->group_cipher == WPA_CIPHER_CCMP) { | |
254 | if (data[2] != 0 || (data[3] & 0x1f) != 0) { | |
255 | add_note(wt, MSG_INFO, "CCMP frame from " MACSTR | |
256 | " used non-zero reserved bit", | |
257 | MAC2STR(bss->bssid)); | |
258 | } | |
259 | } | |
260 | ||
261 | check_plaintext_prot(wt, hdr, data, len); | |
262 | keyid = data[3] >> 6; | |
263 | if (bss->gtk_len[keyid] == 0 && bss->group_cipher != WPA_CIPHER_WEP40) | |
264 | { | |
265 | add_note(wt, MSG_MSGDUMP, "No GTK known to decrypt the frame " | |
266 | "(A2=" MACSTR " KeyID=%d)", | |
267 | MAC2STR(hdr->addr2), keyid); | |
268 | return; | |
269 | } | |
270 | ||
271 | if (bss->group_cipher == WPA_CIPHER_TKIP) | |
272 | tkip_get_pn(pn, data); | |
273 | else if (bss->group_cipher == WPA_CIPHER_WEP40) | |
274 | goto skip_replay_det; | |
275 | else | |
276 | ccmp_get_pn(pn, data); | |
277 | if (os_memcmp(pn, bss->rsc[keyid], 6) <= 0) { | |
278 | u16 seq_ctrl = le_to_host16(hdr->seq_ctrl); | |
279 | char pn_hex[6 * 2 + 1], rsc_hex[6 * 2 + 1]; | |
280 | ||
281 | wpa_snprintf_hex(pn_hex, sizeof(pn_hex), pn, 6); | |
282 | wpa_snprintf_hex(rsc_hex, sizeof(rsc_hex), bss->rsc[keyid], 6); | |
283 | add_note(wt, MSG_INFO, "replay detected: A1=" MACSTR | |
284 | " A2=" MACSTR " A3=" MACSTR | |
285 | " seq=%u frag=%u%s keyid=%d %s<=%s", | |
286 | MAC2STR(hdr->addr1), MAC2STR(hdr->addr2), | |
287 | MAC2STR(hdr->addr3), | |
288 | WLAN_GET_SEQ_SEQ(seq_ctrl), | |
289 | WLAN_GET_SEQ_FRAG(seq_ctrl), | |
290 | (le_to_host16(hdr->frame_control) & WLAN_FC_RETRY) ? | |
291 | " Retry" : "", | |
292 | keyid, pn_hex, rsc_hex); | |
293 | wpa_hexdump(MSG_INFO, "RX PN", pn, 6); | |
294 | wpa_hexdump(MSG_INFO, "RSC", bss->rsc[keyid], 6); | |
295 | replay = 1; | |
296 | } | |
297 | ||
298 | skip_replay_det: | |
299 | if (bss->group_cipher == WPA_CIPHER_TKIP) | |
300 | decrypted = tkip_decrypt(bss->gtk[keyid], hdr, data, len, | |
301 | &dlen); | |
302 | else if (bss->group_cipher == WPA_CIPHER_WEP40) | |
303 | decrypted = wep_decrypt(wt, hdr, data, len, &dlen); | |
304 | else if (bss->group_cipher == WPA_CIPHER_CCMP) | |
305 | decrypted = ccmp_decrypt(bss->gtk[keyid], hdr, data, len, | |
306 | &dlen); | |
307 | else if (bss->group_cipher == WPA_CIPHER_CCMP_256) | |
308 | decrypted = ccmp_256_decrypt(bss->gtk[keyid], hdr, data, len, | |
309 | &dlen); | |
310 | else if (bss->group_cipher == WPA_CIPHER_GCMP || | |
311 | bss->group_cipher == WPA_CIPHER_GCMP_256) | |
312 | decrypted = gcmp_decrypt(bss->gtk[keyid], bss->gtk_len[keyid], | |
313 | hdr, data, len, &dlen); | |
314 | ||
315 | if (decrypted) { | |
316 | char gtk[65]; | |
317 | ||
318 | wpa_snprintf_hex(gtk, sizeof(gtk), bss->gtk[keyid], | |
319 | bss->gtk_len[keyid]); | |
320 | add_note(wt, MSG_EXCESSIVE, "GTK[%d] %s", keyid, gtk); | |
321 | rx_data_process(wt, bss->bssid, NULL, dst, src, decrypted, | |
322 | dlen, 1, NULL); | |
323 | if (!replay) | |
324 | os_memcpy(bss->rsc[keyid], pn, 6); | |
325 | write_pcap_decrypted(wt, (const u8 *) hdr, hdrlen, | |
326 | decrypted, dlen); | |
327 | } else | |
328 | add_note(wt, MSG_DEBUG, "Failed to decrypt frame"); | |
329 | os_free(decrypted); | |
330 | } | |
331 | ||
332 | ||
333 | static void rx_data_bss_prot(struct wlantest *wt, | |
334 | const struct ieee80211_hdr *hdr, size_t hdrlen, | |
335 | const u8 *qos, const u8 *dst, const u8 *src, | |
336 | const u8 *data, size_t len) | |
337 | { | |
338 | struct wlantest_bss *bss, *bss2; | |
339 | struct wlantest_sta *sta, *sta2; | |
340 | int keyid; | |
341 | u16 fc = le_to_host16(hdr->frame_control); | |
342 | u8 *decrypted = NULL; | |
343 | size_t dlen; | |
344 | int tid; | |
345 | u8 pn[6], *rsc = NULL; | |
346 | struct wlantest_tdls *tdls = NULL, *found; | |
347 | const u8 *tk = NULL; | |
348 | int ptk_iter_done = 0; | |
349 | int try_ptk_iter = 0; | |
350 | int replay = 0; | |
351 | ||
352 | if (hdr->addr1[0] & 0x01) { | |
353 | rx_data_bss_prot_group(wt, hdr, hdrlen, qos, dst, src, | |
354 | data, len); | |
355 | return; | |
356 | } | |
357 | ||
358 | if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) == | |
359 | (WLAN_FC_TODS | WLAN_FC_FROMDS)) { | |
360 | bss = bss_find(wt, hdr->addr1); | |
361 | if (bss) { | |
362 | sta = sta_find(bss, hdr->addr2); | |
363 | if (sta) { | |
364 | sta->counters[ | |
365 | WLANTEST_STA_COUNTER_PROT_DATA_TX]++; | |
366 | } | |
367 | if (!sta || !sta->ptk_set) { | |
368 | bss2 = bss_find(wt, hdr->addr2); | |
369 | if (bss2) { | |
370 | sta2 = sta_find(bss2, hdr->addr1); | |
371 | if (sta2 && (!sta || sta2->ptk_set)) { | |
372 | bss = bss2; | |
373 | sta = sta2; | |
374 | } | |
375 | } | |
376 | } | |
377 | } else { | |
378 | bss = bss_find(wt, hdr->addr2); | |
379 | if (!bss) | |
380 | return; | |
381 | sta = sta_find(bss, hdr->addr1); | |
382 | } | |
383 | } else if (fc & WLAN_FC_TODS) { | |
384 | bss = bss_get(wt, hdr->addr1); | |
385 | if (bss == NULL) | |
386 | return; | |
387 | sta = sta_get(bss, hdr->addr2); | |
388 | if (sta) | |
389 | sta->counters[WLANTEST_STA_COUNTER_PROT_DATA_TX]++; | |
390 | } else if (fc & WLAN_FC_FROMDS) { | |
391 | bss = bss_get(wt, hdr->addr2); | |
392 | if (bss == NULL) | |
393 | return; | |
394 | sta = sta_get(bss, hdr->addr1); | |
395 | } else { | |
396 | bss = bss_get(wt, hdr->addr3); | |
397 | if (bss == NULL) | |
398 | return; | |
399 | sta = sta_find(bss, hdr->addr2); | |
400 | sta2 = sta_find(bss, hdr->addr1); | |
401 | if (sta == NULL || sta2 == NULL) | |
402 | return; | |
403 | found = NULL; | |
404 | dl_list_for_each(tdls, &bss->tdls, struct wlantest_tdls, list) | |
405 | { | |
406 | if ((tdls->init == sta && tdls->resp == sta2) || | |
407 | (tdls->init == sta2 && tdls->resp == sta)) { | |
408 | found = tdls; | |
409 | if (tdls->link_up) | |
410 | break; | |
411 | } | |
412 | } | |
413 | if (found) { | |
414 | if (!found->link_up) | |
415 | add_note(wt, MSG_DEBUG, | |
416 | "TDLS: Link not up, but Data " | |
417 | "frame seen"); | |
418 | tk = found->tpk.tk; | |
419 | tdls = found; | |
420 | } | |
421 | } | |
422 | check_plaintext_prot(wt, hdr, data, len); | |
423 | if ((sta == NULL || | |
424 | (!sta->ptk_set && sta->pairwise_cipher != WPA_CIPHER_WEP40)) && | |
425 | tk == NULL) { | |
426 | add_note(wt, MSG_MSGDUMP, "No PTK known to decrypt the frame"); | |
427 | if (dl_list_empty(&wt->ptk)) { | |
428 | if (len >= 4 && sta) { | |
429 | keyid = data[3] >> 6; | |
430 | goto check_zero_tk; | |
431 | } | |
432 | return; | |
433 | } | |
434 | ||
435 | try_ptk_iter = 1; | |
436 | } | |
437 | ||
438 | if (len < 4) { | |
439 | add_note(wt, MSG_INFO, "Too short encrypted data frame"); | |
440 | return; | |
441 | } | |
442 | ||
443 | if (sta == NULL) | |
444 | return; | |
445 | if (sta->pairwise_cipher & (WPA_CIPHER_TKIP | WPA_CIPHER_CCMP) && | |
446 | !(data[3] & 0x20)) { | |
447 | add_note(wt, MSG_INFO, "Expected TKIP/CCMP frame from " | |
448 | MACSTR " did not have ExtIV bit set to 1", | |
449 | MAC2STR(src)); | |
450 | return; | |
451 | } | |
452 | ||
453 | if (tk == NULL && sta->pairwise_cipher == WPA_CIPHER_TKIP) { | |
454 | if (data[3] & 0x1f) { | |
455 | add_note(wt, MSG_INFO, "TKIP frame from " MACSTR | |
456 | " used non-zero reserved bit", | |
457 | MAC2STR(hdr->addr2)); | |
458 | } | |
459 | if (data[1] != ((data[0] | 0x20) & 0x7f)) { | |
460 | add_note(wt, MSG_INFO, "TKIP frame from " MACSTR | |
461 | " used incorrect WEPSeed[1] (was 0x%x, " | |
462 | "expected 0x%x)", | |
463 | MAC2STR(hdr->addr2), data[1], | |
464 | (data[0] | 0x20) & 0x7f); | |
465 | } | |
466 | } else if (tk || sta->pairwise_cipher == WPA_CIPHER_CCMP) { | |
467 | if (data[2] != 0 || (data[3] & 0x1f) != 0) { | |
468 | add_note(wt, MSG_INFO, "CCMP frame from " MACSTR | |
469 | " used non-zero reserved bit", | |
470 | MAC2STR(hdr->addr2)); | |
471 | } | |
472 | } | |
473 | ||
474 | keyid = data[3] >> 6; | |
475 | if (keyid != 0 && | |
476 | (!(sta->rsn_capab & WPA_CAPABILITY_EXT_KEY_ID_FOR_UNICAST) || | |
477 | !(bss->rsn_capab & WPA_CAPABILITY_EXT_KEY_ID_FOR_UNICAST) || | |
478 | keyid != 1)) { | |
479 | add_note(wt, MSG_INFO, | |
480 | "Unexpected KeyID %d in individually addressed Data frame from " | |
481 | MACSTR, | |
482 | keyid, MAC2STR(hdr->addr2)); | |
483 | } | |
484 | ||
485 | if (qos) { | |
486 | tid = qos[0] & 0x0f; | |
487 | if (fc & WLAN_FC_TODS) | |
488 | sta->tx_tid[tid]++; | |
489 | else | |
490 | sta->rx_tid[tid]++; | |
491 | } else { | |
492 | tid = 0; | |
493 | if (fc & WLAN_FC_TODS) | |
494 | sta->tx_tid[16]++; | |
495 | else | |
496 | sta->rx_tid[16]++; | |
497 | } | |
498 | if (tk) { | |
499 | if (os_memcmp(hdr->addr2, tdls->init->addr, ETH_ALEN) == 0) | |
500 | rsc = tdls->rsc_init[tid]; | |
501 | else | |
502 | rsc = tdls->rsc_resp[tid]; | |
503 | } else if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) == | |
504 | (WLAN_FC_TODS | WLAN_FC_FROMDS)) { | |
505 | if (os_memcmp(sta->addr, hdr->addr2, ETH_ALEN) == 0) | |
506 | rsc = sta->rsc_tods[tid]; | |
507 | else | |
508 | rsc = sta->rsc_fromds[tid]; | |
509 | } else if (fc & WLAN_FC_TODS) | |
510 | rsc = sta->rsc_tods[tid]; | |
511 | else | |
512 | rsc = sta->rsc_fromds[tid]; | |
513 | ||
514 | ||
515 | if (tk == NULL && sta->pairwise_cipher == WPA_CIPHER_TKIP) | |
516 | tkip_get_pn(pn, data); | |
517 | else if (sta->pairwise_cipher == WPA_CIPHER_WEP40) | |
518 | goto skip_replay_det; | |
519 | else | |
520 | ccmp_get_pn(pn, data); | |
521 | if (os_memcmp(pn, rsc, 6) <= 0) { | |
522 | u16 seq_ctrl = le_to_host16(hdr->seq_ctrl); | |
523 | char pn_hex[6 * 2 + 1], rsc_hex[6 * 2 + 1]; | |
524 | ||
525 | wpa_snprintf_hex(pn_hex, sizeof(pn_hex), pn, 6); | |
526 | wpa_snprintf_hex(rsc_hex, sizeof(rsc_hex), rsc, 6); | |
527 | add_note(wt, MSG_INFO, "replay detected: A1=" MACSTR | |
528 | " A2=" MACSTR " A3=" MACSTR | |
529 | " seq=%u frag=%u%s keyid=%d tid=%d %s<=%s", | |
530 | MAC2STR(hdr->addr1), MAC2STR(hdr->addr2), | |
531 | MAC2STR(hdr->addr3), | |
532 | WLAN_GET_SEQ_SEQ(seq_ctrl), | |
533 | WLAN_GET_SEQ_FRAG(seq_ctrl), | |
534 | (le_to_host16(hdr->frame_control) & WLAN_FC_RETRY) ? | |
535 | " Retry" : "", | |
536 | keyid, tid, pn_hex, rsc_hex); | |
537 | wpa_hexdump(MSG_INFO, "RX PN", pn, 6); | |
538 | wpa_hexdump(MSG_INFO, "RSC", rsc, 6); | |
539 | replay = 1; | |
540 | } | |
541 | ||
542 | skip_replay_det: | |
543 | if (tk) { | |
544 | if (sta->pairwise_cipher == WPA_CIPHER_CCMP_256) { | |
545 | decrypted = ccmp_256_decrypt(tk, hdr, data, len, &dlen); | |
546 | write_decrypted_note(wt, decrypted, tk, 32, keyid); | |
547 | } else if (sta->pairwise_cipher == WPA_CIPHER_GCMP || | |
548 | sta->pairwise_cipher == WPA_CIPHER_GCMP_256) { | |
549 | decrypted = gcmp_decrypt(tk, sta->ptk.tk_len, hdr, data, | |
550 | len, &dlen); | |
551 | write_decrypted_note(wt, decrypted, tk, sta->ptk.tk_len, | |
552 | keyid); | |
553 | } else { | |
554 | decrypted = ccmp_decrypt(tk, hdr, data, len, &dlen); | |
555 | write_decrypted_note(wt, decrypted, tk, 16, keyid); | |
556 | } | |
557 | } else if (sta->pairwise_cipher == WPA_CIPHER_TKIP) { | |
558 | decrypted = tkip_decrypt(sta->ptk.tk, hdr, data, len, &dlen); | |
559 | write_decrypted_note(wt, decrypted, sta->ptk.tk, 32, keyid); | |
560 | } else if (sta->pairwise_cipher == WPA_CIPHER_WEP40) { | |
561 | decrypted = wep_decrypt(wt, hdr, data, len, &dlen); | |
562 | } else if (sta->ptk_set) { | |
563 | if (sta->pairwise_cipher == WPA_CIPHER_CCMP_256) | |
564 | decrypted = ccmp_256_decrypt(sta->ptk.tk, hdr, data, | |
565 | len, &dlen); | |
566 | else if (sta->pairwise_cipher == WPA_CIPHER_GCMP || | |
567 | sta->pairwise_cipher == WPA_CIPHER_GCMP_256) | |
568 | decrypted = gcmp_decrypt(sta->ptk.tk, sta->ptk.tk_len, | |
569 | hdr, data, len, &dlen); | |
570 | else | |
571 | decrypted = ccmp_decrypt(sta->ptk.tk, hdr, data, len, | |
572 | &dlen); | |
573 | write_decrypted_note(wt, decrypted, sta->ptk.tk, | |
574 | sta->ptk.tk_len, keyid); | |
575 | } else { | |
576 | decrypted = try_all_ptk(wt, sta->pairwise_cipher, hdr, keyid, | |
577 | data, len, &dlen); | |
578 | ptk_iter_done = 1; | |
579 | } | |
580 | if (!decrypted && !ptk_iter_done) { | |
581 | decrypted = try_all_ptk(wt, sta->pairwise_cipher, hdr, keyid, | |
582 | data, len, &dlen); | |
583 | if (decrypted) { | |
584 | add_note(wt, MSG_DEBUG, "Current PTK did not work, but found a match from all known PTKs"); | |
585 | } | |
586 | } | |
587 | check_zero_tk: | |
588 | if (!decrypted) { | |
589 | struct wpa_ptk zero_ptk; | |
590 | int old_debug_level = wpa_debug_level; | |
591 | ||
592 | os_memset(&zero_ptk, 0, sizeof(zero_ptk)); | |
593 | zero_ptk.tk_len = wpa_cipher_key_len(sta->pairwise_cipher); | |
594 | wpa_debug_level = MSG_ERROR; | |
595 | decrypted = try_ptk(sta->pairwise_cipher, &zero_ptk, hdr, | |
596 | data, len, &dlen); | |
597 | wpa_debug_level = old_debug_level; | |
598 | if (decrypted) { | |
599 | add_note(wt, MSG_DEBUG, | |
600 | "Frame was encrypted with zero TK"); | |
601 | wpa_printf(MSG_INFO, "Zero TK used in frame #%u: A2=" | |
602 | MACSTR " seq=%u", | |
603 | wt->frame_num, MAC2STR(hdr->addr2), | |
604 | WLAN_GET_SEQ_SEQ( | |
605 | le_to_host16(hdr->seq_ctrl))); | |
606 | write_decrypted_note(wt, decrypted, zero_ptk.tk, | |
607 | zero_ptk.tk_len, keyid); | |
608 | } | |
609 | } | |
610 | if (decrypted) { | |
611 | u16 fc = le_to_host16(hdr->frame_control); | |
612 | const u8 *peer_addr = NULL; | |
613 | if (!(fc & (WLAN_FC_FROMDS | WLAN_FC_TODS))) | |
614 | peer_addr = hdr->addr1; | |
615 | if (!replay && rsc) | |
616 | os_memcpy(rsc, pn, 6); | |
617 | rx_data_process(wt, bss->bssid, sta->addr, dst, src, decrypted, | |
618 | dlen, 1, peer_addr); | |
619 | write_pcap_decrypted(wt, (const u8 *) hdr, hdrlen, | |
620 | decrypted, dlen); | |
621 | } else { | |
622 | if (!try_ptk_iter) | |
623 | add_note(wt, MSG_DEBUG, "Failed to decrypt frame"); | |
624 | ||
625 | /* Assume the frame was corrupted and there was no FCS to check. | |
626 | * Allow retry of this particular frame to be processed so that | |
627 | * it could end up getting decrypted if it was received without | |
628 | * corruption. */ | |
629 | sta->allow_duplicate = 1; | |
630 | } | |
631 | os_free(decrypted); | |
632 | } | |
633 | ||
634 | ||
635 | static void rx_data_bss(struct wlantest *wt, const struct ieee80211_hdr *hdr, | |
636 | size_t hdrlen, const u8 *qos, const u8 *dst, | |
637 | const u8 *src, const u8 *data, size_t len) | |
638 | { | |
639 | u16 fc = le_to_host16(hdr->frame_control); | |
640 | int prot = !!(fc & WLAN_FC_ISWEP); | |
641 | ||
642 | if (qos) { | |
643 | u8 ack = (qos[0] & 0x60) >> 5; | |
644 | wpa_printf(MSG_MSGDUMP, "BSS DATA: " MACSTR " -> " MACSTR | |
645 | " len=%u%s tid=%u%s%s", | |
646 | MAC2STR(src), MAC2STR(dst), (unsigned int) len, | |
647 | prot ? " Prot" : "", qos[0] & 0x0f, | |
648 | (qos[0] & 0x10) ? " EOSP" : "", | |
649 | ack == 0 ? "" : | |
650 | (ack == 1 ? " NoAck" : | |
651 | (ack == 2 ? " NoExpAck" : " BA"))); | |
652 | } else { | |
653 | wpa_printf(MSG_MSGDUMP, "BSS DATA: " MACSTR " -> " MACSTR | |
654 | " len=%u%s", | |
655 | MAC2STR(src), MAC2STR(dst), (unsigned int) len, | |
656 | prot ? " Prot" : ""); | |
657 | } | |
658 | ||
659 | if (prot) | |
660 | rx_data_bss_prot(wt, hdr, hdrlen, qos, dst, src, data, len); | |
661 | else { | |
662 | const u8 *bssid, *sta_addr, *peer_addr; | |
663 | struct wlantest_bss *bss; | |
664 | ||
665 | if (fc & WLAN_FC_TODS) { | |
666 | bssid = hdr->addr1; | |
667 | sta_addr = hdr->addr2; | |
668 | peer_addr = NULL; | |
669 | } else if (fc & WLAN_FC_FROMDS) { | |
670 | bssid = hdr->addr2; | |
671 | sta_addr = hdr->addr1; | |
672 | peer_addr = NULL; | |
673 | } else { | |
674 | bssid = hdr->addr3; | |
675 | sta_addr = hdr->addr2; | |
676 | peer_addr = hdr->addr1; | |
677 | } | |
678 | ||
679 | bss = bss_get(wt, bssid); | |
680 | if (bss) { | |
681 | struct wlantest_sta *sta = sta_get(bss, sta_addr); | |
682 | ||
683 | if (sta) { | |
684 | if (qos) { | |
685 | int tid = qos[0] & 0x0f; | |
686 | if (fc & WLAN_FC_TODS) | |
687 | sta->tx_tid[tid]++; | |
688 | else | |
689 | sta->rx_tid[tid]++; | |
690 | } else { | |
691 | if (fc & WLAN_FC_TODS) | |
692 | sta->tx_tid[16]++; | |
693 | else | |
694 | sta->rx_tid[16]++; | |
695 | } | |
696 | } | |
697 | } | |
698 | ||
699 | rx_data_process(wt, bssid, sta_addr, dst, src, data, len, 0, | |
700 | peer_addr); | |
701 | } | |
702 | } | |
703 | ||
704 | ||
705 | static struct wlantest_tdls * get_tdls(struct wlantest *wt, const u8 *bssid, | |
706 | const u8 *sta1_addr, | |
707 | const u8 *sta2_addr) | |
708 | { | |
709 | struct wlantest_bss *bss; | |
710 | struct wlantest_sta *sta1, *sta2; | |
711 | struct wlantest_tdls *tdls, *found = NULL; | |
712 | ||
713 | bss = bss_find(wt, bssid); | |
714 | if (bss == NULL) | |
715 | return NULL; | |
716 | sta1 = sta_find(bss, sta1_addr); | |
717 | if (sta1 == NULL) | |
718 | return NULL; | |
719 | sta2 = sta_find(bss, sta2_addr); | |
720 | if (sta2 == NULL) | |
721 | return NULL; | |
722 | ||
723 | dl_list_for_each(tdls, &bss->tdls, struct wlantest_tdls, list) { | |
724 | if ((tdls->init == sta1 && tdls->resp == sta2) || | |
725 | (tdls->init == sta2 && tdls->resp == sta1)) { | |
726 | found = tdls; | |
727 | if (tdls->link_up) | |
728 | break; | |
729 | } | |
730 | } | |
731 | ||
732 | return found; | |
733 | } | |
734 | ||
735 | ||
736 | static void add_direct_link(struct wlantest *wt, const u8 *bssid, | |
737 | const u8 *sta1_addr, const u8 *sta2_addr) | |
738 | { | |
739 | struct wlantest_tdls *tdls; | |
740 | ||
741 | tdls = get_tdls(wt, bssid, sta1_addr, sta2_addr); | |
742 | if (tdls == NULL) | |
743 | return; | |
744 | ||
745 | if (tdls->link_up) | |
746 | tdls->counters[WLANTEST_TDLS_COUNTER_VALID_DIRECT_LINK]++; | |
747 | else | |
748 | tdls->counters[WLANTEST_TDLS_COUNTER_INVALID_DIRECT_LINK]++; | |
749 | } | |
750 | ||
751 | ||
752 | static void add_ap_path(struct wlantest *wt, const u8 *bssid, | |
753 | const u8 *sta1_addr, const u8 *sta2_addr) | |
754 | { | |
755 | struct wlantest_tdls *tdls; | |
756 | ||
757 | tdls = get_tdls(wt, bssid, sta1_addr, sta2_addr); | |
758 | if (tdls == NULL) | |
759 | return; | |
760 | ||
761 | if (tdls->link_up) | |
762 | tdls->counters[WLANTEST_TDLS_COUNTER_INVALID_AP_PATH]++; | |
763 | else | |
764 | tdls->counters[WLANTEST_TDLS_COUNTER_VALID_AP_PATH]++; | |
765 | } | |
766 | ||
767 | ||
768 | void rx_data(struct wlantest *wt, const u8 *data, size_t len) | |
769 | { | |
770 | const struct ieee80211_hdr *hdr; | |
771 | u16 fc, stype; | |
772 | size_t hdrlen; | |
773 | const u8 *qos = NULL; | |
774 | ||
775 | if (len < 24) | |
776 | return; | |
777 | ||
778 | hdr = (const struct ieee80211_hdr *) data; | |
779 | fc = le_to_host16(hdr->frame_control); | |
780 | stype = WLAN_FC_GET_STYPE(fc); | |
781 | hdrlen = 24; | |
782 | if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) == | |
783 | (WLAN_FC_TODS | WLAN_FC_FROMDS)) | |
784 | hdrlen += ETH_ALEN; | |
785 | if (stype & 0x08) { | |
786 | qos = data + hdrlen; | |
787 | hdrlen += 2; | |
788 | } | |
789 | if (len < hdrlen) | |
790 | return; | |
791 | wt->rx_data++; | |
792 | ||
793 | switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) { | |
794 | case 0: | |
795 | wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s IBSS DA=" MACSTR " SA=" | |
796 | MACSTR " BSSID=" MACSTR, | |
797 | data_stype(WLAN_FC_GET_STYPE(fc)), | |
798 | fc & WLAN_FC_PWRMGT ? " PwrMgt" : "", | |
799 | fc & WLAN_FC_ISWEP ? " Prot" : "", | |
800 | MAC2STR(hdr->addr1), MAC2STR(hdr->addr2), | |
801 | MAC2STR(hdr->addr3)); | |
802 | add_direct_link(wt, hdr->addr3, hdr->addr1, hdr->addr2); | |
803 | rx_data_bss(wt, hdr, hdrlen, qos, hdr->addr1, hdr->addr2, | |
804 | data + hdrlen, len - hdrlen); | |
805 | break; | |
806 | case WLAN_FC_FROMDS: | |
807 | wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s FromDS DA=" MACSTR | |
808 | " BSSID=" MACSTR " SA=" MACSTR, | |
809 | data_stype(WLAN_FC_GET_STYPE(fc)), | |
810 | fc & WLAN_FC_PWRMGT ? " PwrMgt" : "", | |
811 | fc & WLAN_FC_ISWEP ? " Prot" : "", | |
812 | MAC2STR(hdr->addr1), MAC2STR(hdr->addr2), | |
813 | MAC2STR(hdr->addr3)); | |
814 | add_ap_path(wt, hdr->addr2, hdr->addr1, hdr->addr3); | |
815 | rx_data_bss(wt, hdr, hdrlen, qos, hdr->addr1, hdr->addr3, | |
816 | data + hdrlen, len - hdrlen); | |
817 | break; | |
818 | case WLAN_FC_TODS: | |
819 | wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s ToDS BSSID=" MACSTR | |
820 | " SA=" MACSTR " DA=" MACSTR, | |
821 | data_stype(WLAN_FC_GET_STYPE(fc)), | |
822 | fc & WLAN_FC_PWRMGT ? " PwrMgt" : "", | |
823 | fc & WLAN_FC_ISWEP ? " Prot" : "", | |
824 | MAC2STR(hdr->addr1), MAC2STR(hdr->addr2), | |
825 | MAC2STR(hdr->addr3)); | |
826 | add_ap_path(wt, hdr->addr1, hdr->addr3, hdr->addr2); | |
827 | rx_data_bss(wt, hdr, hdrlen, qos, hdr->addr3, hdr->addr2, | |
828 | data + hdrlen, len - hdrlen); | |
829 | break; | |
830 | case WLAN_FC_TODS | WLAN_FC_FROMDS: | |
831 | wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s WDS RA=" MACSTR " TA=" | |
832 | MACSTR " DA=" MACSTR " SA=" MACSTR, | |
833 | data_stype(WLAN_FC_GET_STYPE(fc)), | |
834 | fc & WLAN_FC_PWRMGT ? " PwrMgt" : "", | |
835 | fc & WLAN_FC_ISWEP ? " Prot" : "", | |
836 | MAC2STR(hdr->addr1), MAC2STR(hdr->addr2), | |
837 | MAC2STR(hdr->addr3), | |
838 | MAC2STR((const u8 *) (hdr + 1))); | |
839 | rx_data_bss(wt, hdr, hdrlen, qos, hdr->addr1, hdr->addr2, | |
840 | data + hdrlen, len - hdrlen); | |
841 | break; | |
842 | } | |
843 | } |