wlantest/rx_data.c

   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;
 343         size_t dlen;
 344         int tid;
 345         u8 pn[6], *rsc;
 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                         return;
 429                 try_ptk_iter = 1;
 430         }
 431
 432         if (len < 4) {
 433                 add_note(wt, MSG_INFO, "Too short encrypted data frame");
 434                 return;
 435         }
 436
 437         if (sta == NULL)
 438                 return;
 439         if (sta->pairwise_cipher & (WPA_CIPHER_TKIP | WPA_CIPHER_CCMP) &&
 440             !(data[3] & 0x20)) {
 441                 add_note(wt, MSG_INFO, "Expected TKIP/CCMP frame from "
 442                          MACSTR " did not have ExtIV bit set to 1",
 443                          MAC2STR(src));
 444                 return;
 445         }
 446
 447         if (tk == NULL && sta->pairwise_cipher == WPA_CIPHER_TKIP) {
 448                 if (data[3] & 0x1f) {
 449                         add_note(wt, MSG_INFO, "TKIP frame from " MACSTR
 450                                  " used non-zero reserved bit",
 451                                  MAC2STR(hdr->addr2));
 452                 }
 453                 if (data[1] != ((data[0] | 0x20) & 0x7f)) {
 454                         add_note(wt, MSG_INFO, "TKIP frame from " MACSTR
 455                                  " used incorrect WEPSeed[1] (was 0x%x, "
 456                                  "expected 0x%x)",
 457                                  MAC2STR(hdr->addr2), data[1],
 458                                  (data[0] | 0x20) & 0x7f);
 459                 }
 460         } else if (tk || sta->pairwise_cipher == WPA_CIPHER_CCMP) {
 461                 if (data[2] != 0 || (data[3] & 0x1f) != 0) {
 462                         add_note(wt, MSG_INFO, "CCMP frame from " MACSTR
 463                                  " used non-zero reserved bit",
 464                                  MAC2STR(hdr->addr2));
 465                 }
 466         }
 467
 468         keyid = data[3] >> 6;
 469         if (keyid != 0) {
 470                 add_note(wt, MSG_INFO, "Unexpected non-zero KeyID %d in "
 471                          "individually addressed Data frame from " MACSTR,
 472                          keyid, MAC2STR(hdr->addr2));
 473         }
 474
 475         if (qos) {
 476                 tid = qos[0] & 0x0f;
 477                 if (fc & WLAN_FC_TODS)
 478                         sta->tx_tid[tid]++;
 479                 else
 480                         sta->rx_tid[tid]++;
 481         } else {
 482                 tid = 0;
 483                 if (fc & WLAN_FC_TODS)
 484                         sta->tx_tid[16]++;
 485                 else
 486                         sta->rx_tid[16]++;
 487         }
 488         if (tk) {
 489                 if (os_memcmp(hdr->addr2, tdls->init->addr, ETH_ALEN) == 0)
 490                         rsc = tdls->rsc_init[tid];
 491                 else
 492                         rsc = tdls->rsc_resp[tid];
 493         } else if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
 494                    (WLAN_FC_TODS | WLAN_FC_FROMDS)) {
 495                 if (os_memcmp(sta->addr, hdr->addr2, ETH_ALEN) == 0)
 496                         rsc = sta->rsc_tods[tid];
 497                 else
 498                         rsc = sta->rsc_fromds[tid];
 499         } else if (fc & WLAN_FC_TODS)
 500                 rsc = sta->rsc_tods[tid];
 501         else
 502                 rsc = sta->rsc_fromds[tid];
 503
 504
 505         if (tk == NULL && sta->pairwise_cipher == WPA_CIPHER_TKIP)
 506                 tkip_get_pn(pn, data);
 507         else if (sta->pairwise_cipher == WPA_CIPHER_WEP40)
 508                 goto skip_replay_det;
 509         else
 510                 ccmp_get_pn(pn, data);
 511         if (os_memcmp(pn, rsc, 6) <= 0) {
 512                 u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
 513                 char pn_hex[6 * 2 + 1], rsc_hex[6 * 2 + 1];
 514
 515                 wpa_snprintf_hex(pn_hex, sizeof(pn_hex), pn, 6);
 516                 wpa_snprintf_hex(rsc_hex, sizeof(rsc_hex), rsc, 6);
 517                 add_note(wt, MSG_INFO, "replay detected: A1=" MACSTR
 518                          " A2=" MACSTR " A3=" MACSTR
 519                          " seq=%u frag=%u%s keyid=%d tid=%d %s<=%s",
 520                          MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
 521                          MAC2STR(hdr->addr3),
 522                          WLAN_GET_SEQ_SEQ(seq_ctrl),
 523                          WLAN_GET_SEQ_FRAG(seq_ctrl),
 524                          (le_to_host16(hdr->frame_control) &  WLAN_FC_RETRY) ?
 525                          " Retry" : "",
 526                          keyid, tid, pn_hex, rsc_hex);
 527                 wpa_hexdump(MSG_INFO, "RX PN", pn, 6);
 528                 wpa_hexdump(MSG_INFO, "RSC", rsc, 6);
 529                 replay = 1;
 530         }
 531
 532 skip_replay_det:
 533         if (tk) {
 534                 if (sta->pairwise_cipher == WPA_CIPHER_CCMP_256) {
 535                         decrypted = ccmp_256_decrypt(tk, hdr, data, len, &dlen);
 536                         write_decrypted_note(wt, decrypted, tk, 32, keyid);
 537                 } else if (sta->pairwise_cipher == WPA_CIPHER_GCMP ||
 538                            sta->pairwise_cipher == WPA_CIPHER_GCMP_256) {
 539                         decrypted = gcmp_decrypt(tk, sta->ptk.tk_len, hdr, data,
 540                                                  len, &dlen);
 541                         write_decrypted_note(wt, decrypted, tk, sta->ptk.tk_len,
 542                                              keyid);
 543                 } else {
 544                         decrypted = ccmp_decrypt(tk, hdr, data, len, &dlen);
 545                         write_decrypted_note(wt, decrypted, tk, 16, keyid);
 546                 }
 547         } else if (sta->pairwise_cipher == WPA_CIPHER_TKIP) {
 548                 decrypted = tkip_decrypt(sta->ptk.tk, hdr, data, len, &dlen);
 549                 write_decrypted_note(wt, decrypted, sta->ptk.tk, 32, keyid);
 550         } else if (sta->pairwise_cipher == WPA_CIPHER_WEP40) {
 551                 decrypted = wep_decrypt(wt, hdr, data, len, &dlen);
 552         } else if (sta->ptk_set) {
 553                 if (sta->pairwise_cipher == WPA_CIPHER_CCMP_256)
 554                         decrypted = ccmp_256_decrypt(sta->ptk.tk, hdr, data,
 555                                                      len, &dlen);
 556                 else if (sta->pairwise_cipher == WPA_CIPHER_GCMP ||
 557                          sta->pairwise_cipher == WPA_CIPHER_GCMP_256)
 558                         decrypted = gcmp_decrypt(sta->ptk.tk, sta->ptk.tk_len,
 559                                                  hdr, data, len, &dlen);
 560                 else
 561                         decrypted = ccmp_decrypt(sta->ptk.tk, hdr, data, len,
 562                                                  &dlen);
 563                 write_decrypted_note(wt, decrypted, sta->ptk.tk,
 564                                      sta->ptk.tk_len, keyid);
 565         } else {
 566                 decrypted = try_all_ptk(wt, sta->pairwise_cipher, hdr, keyid,
 567                                         data, len, &dlen);
 568                 ptk_iter_done = 1;
 569         }
 570         if (!decrypted && !ptk_iter_done) {
 571                 decrypted = try_all_ptk(wt, sta->pairwise_cipher, hdr, keyid,
 572                                         data, len, &dlen);
 573                 if (decrypted) {
 574                         add_note(wt, MSG_DEBUG, "Current PTK did not work, but found a match from all known PTKs");
 575                 }
 576         }
 577         if (!decrypted) {
 578                 struct wpa_ptk zero_ptk;
 579
 580                 os_memset(&zero_ptk, 0, sizeof(zero_ptk));
 581                 zero_ptk.tk_len = wpa_cipher_key_len(sta->pairwise_cipher);
 582                 decrypted = try_ptk(sta->pairwise_cipher, &zero_ptk, hdr,
 583                                     data, len, &dlen);
 584                 if (decrypted) {
 585                         add_note(wt, MSG_DEBUG,
 586                                  "Frame was encrypted with zero TK");
 587                         write_decrypted_note(wt, decrypted, zero_ptk.tk,
 588                                              zero_ptk.tk_len, keyid);
 589                 }
 590         }
 591         if (decrypted) {
 592                 u16 fc = le_to_host16(hdr->frame_control);
 593                 const u8 *peer_addr = NULL;
 594                 if (!(fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)))
 595                         peer_addr = hdr->addr1;
 596                 if (!replay)
 597                         os_memcpy(rsc, pn, 6);
 598                 rx_data_process(wt, bss->bssid, sta->addr, dst, src, decrypted,
 599                                 dlen, 1, peer_addr);
 600                 write_pcap_decrypted(wt, (const u8 *) hdr, hdrlen,
 601                                      decrypted, dlen);
 602         } else {
 603                 if (!try_ptk_iter)
 604                         add_note(wt, MSG_DEBUG, "Failed to decrypt frame");
 605
 606                 /* Assume the frame was corrupted and there was no FCS to check.
 607                  * Allow retry of this particular frame to be processed so that
 608                  * it could end up getting decrypted if it was received without
 609                  * corruption. */
 610                 sta->allow_duplicate = 1;
 611         }
 612         os_free(decrypted);
 613 }
 614
 615
 616 static void rx_data_bss(struct wlantest *wt, const struct ieee80211_hdr *hdr,
 617                         size_t hdrlen, const u8 *qos, const u8 *dst,
 618                         const u8 *src, const u8 *data, size_t len)
 619 {
 620         u16 fc = le_to_host16(hdr->frame_control);
 621         int prot = !!(fc & WLAN_FC_ISWEP);
 622
 623         if (qos) {
 624                 u8 ack = (qos[0] & 0x60) >> 5;
 625                 wpa_printf(MSG_MSGDUMP, "BSS DATA: " MACSTR " -> " MACSTR
 626                            " len=%u%s tid=%u%s%s",
 627                            MAC2STR(src), MAC2STR(dst), (unsigned int) len,
 628                            prot ? " Prot" : "", qos[0] & 0x0f,
 629                            (qos[0] & 0x10) ? " EOSP" : "",
 630                            ack == 0 ? "" :
 631                            (ack == 1 ? " NoAck" :
 632                             (ack == 2 ? " NoExpAck" : " BA")));
 633         } else {
 634                 wpa_printf(MSG_MSGDUMP, "BSS DATA: " MACSTR " -> " MACSTR
 635                            " len=%u%s",
 636                            MAC2STR(src), MAC2STR(dst), (unsigned int) len,
 637                            prot ? " Prot" : "");
 638         }
 639
 640         if (prot)
 641                 rx_data_bss_prot(wt, hdr, hdrlen, qos, dst, src, data, len);
 642         else {
 643                 const u8 *bssid, *sta_addr, *peer_addr;
 644                 struct wlantest_bss *bss;
 645
 646                 if (fc & WLAN_FC_TODS) {
 647                         bssid = hdr->addr1;
 648                         sta_addr = hdr->addr2;
 649                         peer_addr = NULL;
 650                 } else if (fc & WLAN_FC_FROMDS) {
 651                         bssid = hdr->addr2;
 652                         sta_addr = hdr->addr1;
 653                         peer_addr = NULL;
 654                 } else {
 655                         bssid = hdr->addr3;
 656                         sta_addr = hdr->addr2;
 657                         peer_addr = hdr->addr1;
 658                 }
 659
 660                 bss = bss_get(wt, bssid);
 661                 if (bss) {
 662                         struct wlantest_sta *sta = sta_get(bss, sta_addr);
 663
 664                         if (sta) {
 665                                 if (qos) {
 666                                         int tid = qos[0] & 0x0f;
 667                                         if (fc & WLAN_FC_TODS)
 668                                                 sta->tx_tid[tid]++;
 669                                         else
 670                                                 sta->rx_tid[tid]++;
 671                                 } else {
 672                                         if (fc & WLAN_FC_TODS)
 673                                                 sta->tx_tid[16]++;
 674                                         else
 675                                                 sta->rx_tid[16]++;
 676                                 }
 677                         }
 678                 }
 679
 680                 rx_data_process(wt, bssid, sta_addr, dst, src, data, len, 0,
 681                                 peer_addr);
 682         }
 683 }
 684
 685
 686 static struct wlantest_tdls * get_tdls(struct wlantest *wt, const u8 *bssid,
 687                                        const u8 *sta1_addr,
 688                                        const u8 *sta2_addr)
 689 {
 690         struct wlantest_bss *bss;
 691         struct wlantest_sta *sta1, *sta2;
 692         struct wlantest_tdls *tdls, *found = NULL;
 693
 694         bss = bss_find(wt, bssid);
 695         if (bss == NULL)
 696                 return NULL;
 697         sta1 = sta_find(bss, sta1_addr);
 698         if (sta1 == NULL)
 699                 return NULL;
 700         sta2 = sta_find(bss, sta2_addr);
 701         if (sta2 == NULL)
 702                 return NULL;
 703
 704         dl_list_for_each(tdls, &bss->tdls, struct wlantest_tdls, list) {
 705                 if ((tdls->init == sta1 && tdls->resp == sta2) ||
 706                     (tdls->init == sta2 && tdls->resp == sta1)) {
 707                         found = tdls;
 708                         if (tdls->link_up)
 709                                 break;
 710                 }
 711         }
 712
 713         return found;
 714 }
 715
 716
 717 static void add_direct_link(struct wlantest *wt, const u8 *bssid,
 718                             const u8 *sta1_addr, const u8 *sta2_addr)
 719 {
 720         struct wlantest_tdls *tdls;
 721
 722         tdls = get_tdls(wt, bssid, sta1_addr, sta2_addr);
 723         if (tdls == NULL)
 724                 return;
 725
 726         if (tdls->link_up)
 727                 tdls->counters[WLANTEST_TDLS_COUNTER_VALID_DIRECT_LINK]++;
 728         else
 729                 tdls->counters[WLANTEST_TDLS_COUNTER_INVALID_DIRECT_LINK]++;
 730 }
 731
 732
 733 static void add_ap_path(struct wlantest *wt, const u8 *bssid,
 734                         const u8 *sta1_addr, const u8 *sta2_addr)
 735 {
 736         struct wlantest_tdls *tdls;
 737
 738         tdls = get_tdls(wt, bssid, sta1_addr, sta2_addr);
 739         if (tdls == NULL)
 740                 return;
 741
 742         if (tdls->link_up)
 743                 tdls->counters[WLANTEST_TDLS_COUNTER_INVALID_AP_PATH]++;
 744         else
 745                 tdls->counters[WLANTEST_TDLS_COUNTER_VALID_AP_PATH]++;
 746 }
 747
 748
 749 void rx_data(struct wlantest *wt, const u8 *data, size_t len)
 750 {
 751         const struct ieee80211_hdr *hdr;
 752         u16 fc, stype;
 753         size_t hdrlen;
 754         const u8 *qos = NULL;
 755
 756         if (len < 24)
 757                 return;
 758
 759         hdr = (const struct ieee80211_hdr *) data;
 760         fc = le_to_host16(hdr->frame_control);
 761         stype = WLAN_FC_GET_STYPE(fc);
 762         hdrlen = 24;
 763         if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
 764             (WLAN_FC_TODS | WLAN_FC_FROMDS))
 765                 hdrlen += ETH_ALEN;
 766         if (stype & 0x08) {
 767                 qos = data + hdrlen;
 768                 hdrlen += 2;
 769         }
 770         if (len < hdrlen)
 771                 return;
 772         wt->rx_data++;
 773
 774         switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) {
 775         case 0:
 776                 wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s IBSS DA=" MACSTR " SA="
 777                            MACSTR " BSSID=" MACSTR,
 778                            data_stype(WLAN_FC_GET_STYPE(fc)),
 779                            fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
 780                            fc & WLAN_FC_ISWEP ? " Prot" : "",
 781                            MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
 782                            MAC2STR(hdr->addr3));
 783                 add_direct_link(wt, hdr->addr3, hdr->addr1, hdr->addr2);
 784                 rx_data_bss(wt, hdr, hdrlen, qos, hdr->addr1, hdr->addr2,
 785                             data + hdrlen, len - hdrlen);
 786                 break;
 787         case WLAN_FC_FROMDS:
 788                 wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s FromDS DA=" MACSTR
 789                            " BSSID=" MACSTR " SA=" MACSTR,
 790                            data_stype(WLAN_FC_GET_STYPE(fc)),
 791                            fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
 792                            fc & WLAN_FC_ISWEP ? " Prot" : "",
 793                            MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
 794                            MAC2STR(hdr->addr3));
 795                 add_ap_path(wt, hdr->addr2, hdr->addr1, hdr->addr3);
 796                 rx_data_bss(wt, hdr, hdrlen, qos, hdr->addr1, hdr->addr3,
 797                             data + hdrlen, len - hdrlen);
 798                 break;
 799         case WLAN_FC_TODS:
 800                 wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s ToDS BSSID=" MACSTR
 801                            " SA=" MACSTR " DA=" MACSTR,
 802                            data_stype(WLAN_FC_GET_STYPE(fc)),
 803                            fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
 804                            fc & WLAN_FC_ISWEP ? " Prot" : "",
 805                            MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
 806                            MAC2STR(hdr->addr3));
 807                 add_ap_path(wt, hdr->addr1, hdr->addr3, hdr->addr2);
 808                 rx_data_bss(wt, hdr, hdrlen, qos, hdr->addr3, hdr->addr2,
 809                             data + hdrlen, len - hdrlen);
 810                 break;
 811         case WLAN_FC_TODS | WLAN_FC_FROMDS:
 812                 wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s WDS RA=" MACSTR " TA="
 813                            MACSTR " DA=" MACSTR " SA=" MACSTR,
 814                            data_stype(WLAN_FC_GET_STYPE(fc)),
 815                            fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
 816                            fc & WLAN_FC_ISWEP ? " Prot" : "",
 817                            MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
 818                            MAC2STR(hdr->addr3),
 819                            MAC2STR((const u8 *) (hdr + 1)));
 820                 rx_data_bss(wt, hdr, hdrlen, qos, hdr->addr1, hdr->addr2,
 821                             data + hdrlen, len - hdrlen);
 822                 break;
 823         }
 824 }