wlantest/rx_mgmt.c

   1 /*
   2  * Received Management frame processing
   3  * Copyright (c) 2010, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "utils/includes.h"
  16
  17 #include "utils/common.h"
  18 #include "common/ieee802_11_defs.h"
  19 #include "common/ieee802_11_common.h"
  20 #include "crypto/aes_wrap.h"
  21 #include "wlantest.h"
  22
  23
  24 static const char * mgmt_stype(u16 stype)
  25 {
  26         switch (stype) {
  27         case WLAN_FC_STYPE_ASSOC_REQ:
  28                 return "ASSOC-REQ";
  29         case WLAN_FC_STYPE_ASSOC_RESP:
  30                 return "ASSOC-RESP";
  31         case WLAN_FC_STYPE_REASSOC_REQ:
  32                 return "REASSOC-REQ";
  33         case WLAN_FC_STYPE_REASSOC_RESP:
  34                 return "REASSOC-RESP";
  35         case WLAN_FC_STYPE_PROBE_REQ:
  36                 return "PROBE-REQ";
  37         case WLAN_FC_STYPE_PROBE_RESP:
  38                 return "PROBE-RESP";
  39         case WLAN_FC_STYPE_BEACON:
  40                 return "BEACON";
  41         case WLAN_FC_STYPE_ATIM:
  42                 return "ATIM";
  43         case WLAN_FC_STYPE_DISASSOC:
  44                 return "DISASSOC";
  45         case WLAN_FC_STYPE_AUTH:
  46                 return "AUTH";
  47         case WLAN_FC_STYPE_DEAUTH:
  48                 return "DEAUTH";
  49         case WLAN_FC_STYPE_ACTION:
  50                 return "ACTION";
  51         }
  52         return "??";
  53 }
  54
  55
  56 static void rx_mgmt_beacon(struct wlantest *wt, const u8 *data, size_t len)
  57 {
  58         const struct ieee80211_mgmt *mgmt;
  59         struct wlantest_bss *bss;
  60         struct ieee802_11_elems elems;
  61
  62         mgmt = (const struct ieee80211_mgmt *) data;
  63         bss = bss_get(wt, mgmt->bssid);
  64         if (bss == NULL)
  65                 return;
  66         if (bss->proberesp_seen)
  67                 return; /* do not override with Beacon data */
  68         bss->capab_info = le_to_host16(mgmt->u.beacon.capab_info);
  69         if (ieee802_11_parse_elems(mgmt->u.beacon.variable,
  70                                    len - (mgmt->u.beacon.variable - data),
  71                                    &elems, 0) == ParseFailed) {
  72                 if (bss->parse_error_reported)
  73                         return;
  74                 wpa_printf(MSG_INFO, "Invalid IEs in a Beacon frame from "
  75                            MACSTR, MAC2STR(mgmt->sa));
  76                 bss->parse_error_reported = 1;
  77                 return;
  78         }
  79
  80         bss_update(wt, bss, &elems);
  81 }
  82
  83
  84 static void rx_mgmt_probe_resp(struct wlantest *wt, const u8 *data, size_t len)
  85 {
  86         const struct ieee80211_mgmt *mgmt;
  87         struct wlantest_bss *bss;
  88         struct ieee802_11_elems elems;
  89
  90         mgmt = (const struct ieee80211_mgmt *) data;
  91         bss = bss_get(wt, mgmt->bssid);
  92         if (bss == NULL)
  93                 return;
  94
  95         bss->capab_info = le_to_host16(mgmt->u.probe_resp.capab_info);
  96         if (ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
  97                                    len - (mgmt->u.probe_resp.variable - data),
  98                                    &elems, 0) == ParseFailed) {
  99                 if (bss->parse_error_reported)
 100                         return;
 101                 wpa_printf(MSG_INFO, "Invalid IEs in a Probe Response frame "
 102                            "from " MACSTR, MAC2STR(mgmt->sa));
 103                 bss->parse_error_reported = 1;
 104                 return;
 105         }
 106
 107         bss_update(wt, bss, &elems);
 108 }
 109
 110
 111 static void rx_mgmt_auth(struct wlantest *wt, const u8 *data, size_t len)
 112 {
 113         const struct ieee80211_mgmt *mgmt;
 114         struct wlantest_bss *bss;
 115         struct wlantest_sta *sta;
 116         u16 alg, trans, status;
 117
 118         mgmt = (const struct ieee80211_mgmt *) data;
 119         bss = bss_get(wt, mgmt->bssid);
 120         if (bss == NULL)
 121                 return;
 122         if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
 123                 sta = sta_get(bss, mgmt->da);
 124         else
 125                 sta = sta_get(bss, mgmt->sa);
 126         if (sta == NULL)
 127                 return;
 128
 129         if (len < 24 + 6) {
 130                 wpa_printf(MSG_INFO, "Too short Authentication frame from "
 131                            MACSTR, MAC2STR(mgmt->sa));
 132                 return;
 133         }
 134
 135         alg = le_to_host16(mgmt->u.auth.auth_alg);
 136         trans = le_to_host16(mgmt->u.auth.auth_transaction);
 137         status = le_to_host16(mgmt->u.auth.status_code);
 138
 139         wpa_printf(MSG_DEBUG, "AUTH " MACSTR " -> " MACSTR
 140                    " (alg=%u trans=%u status=%u)",
 141                    MAC2STR(mgmt->sa), MAC2STR(mgmt->da), alg, trans, status);
 142
 143         if (alg == 0 && trans == 2 && status == 0) {
 144                 if (sta->state == STATE1) {
 145                         wpa_printf(MSG_DEBUG, "STA " MACSTR
 146                                    " moved to State 2 with " MACSTR,
 147                                    MAC2STR(sta->addr), MAC2STR(bss->bssid));
 148                         sta->state = STATE2;
 149                 }
 150         }
 151 }
 152
 153
 154 static void rx_mgmt_deauth(struct wlantest *wt, const u8 *data, size_t len,
 155                            int valid)
 156 {
 157         const struct ieee80211_mgmt *mgmt;
 158         struct wlantest_bss *bss;
 159         struct wlantest_sta *sta;
 160
 161         mgmt = (const struct ieee80211_mgmt *) data;
 162         bss = bss_get(wt, mgmt->bssid);
 163         if (bss == NULL)
 164                 return;
 165         if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
 166                 sta = sta_get(bss, mgmt->da);
 167         else
 168                 sta = sta_get(bss, mgmt->sa);
 169         if (sta == NULL)
 170                 return;
 171
 172         if (len < 24 + 2) {
 173                 wpa_printf(MSG_INFO, "Too short Deauthentication frame from "
 174                            MACSTR, MAC2STR(mgmt->sa));
 175                 return;
 176         }
 177
 178         wpa_printf(MSG_DEBUG, "DEAUTH " MACSTR " -> " MACSTR
 179                    " (reason=%u)",
 180                    MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
 181                    le_to_host16(mgmt->u.deauth.reason_code));
 182         wpa_hexdump(MSG_MSGDUMP, "DEAUTH payload", data + 24, len - 24);
 183
 184         if (!valid) {
 185                 wpa_printf(MSG_INFO, "Do not change STA " MACSTR " State "
 186                            "since Disassociation frame was not protected "
 187                            "correctly", MAC2STR(sta->addr));
 188                 return;
 189         }
 190
 191         if (sta->state != STATE1) {
 192                 wpa_printf(MSG_DEBUG, "STA " MACSTR
 193                            " moved to State 1 with " MACSTR,
 194                            MAC2STR(sta->addr), MAC2STR(bss->bssid));
 195                 sta->state = STATE1;
 196         }
 197 }
 198
 199
 200 static void rx_mgmt_assoc_req(struct wlantest *wt, const u8 *data, size_t len)
 201 {
 202         const struct ieee80211_mgmt *mgmt;
 203         struct wlantest_bss *bss;
 204         struct wlantest_sta *sta;
 205         struct ieee802_11_elems elems;
 206
 207         mgmt = (const struct ieee80211_mgmt *) data;
 208         bss = bss_get(wt, mgmt->bssid);
 209         if (bss == NULL)
 210                 return;
 211         sta = sta_get(bss, mgmt->sa);
 212         if (sta == NULL)
 213                 return;
 214
 215         if (len < 24 + 4) {
 216                 wpa_printf(MSG_INFO, "Too short Association Request frame "
 217                            "from " MACSTR, MAC2STR(mgmt->sa));
 218                 return;
 219         }
 220
 221         wpa_printf(MSG_DEBUG, "ASSOCREQ " MACSTR " -> " MACSTR
 222                    " (capab=0x%x listen_int=%u)",
 223                    MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
 224                    le_to_host16(mgmt->u.assoc_req.capab_info),
 225                    le_to_host16(mgmt->u.assoc_req.listen_interval));
 226
 227         if (ieee802_11_parse_elems(mgmt->u.assoc_req.variable,
 228                                    len - (mgmt->u.assoc_req.variable - data),
 229                                    &elems, 0) == ParseFailed) {
 230                 wpa_printf(MSG_INFO, "Invalid IEs in Association Request "
 231                            "frame from " MACSTR, MAC2STR(mgmt->sa));
 232                 return;
 233         }
 234
 235         sta_update_assoc(sta, &elems);
 236 }
 237
 238
 239 static void rx_mgmt_assoc_resp(struct wlantest *wt, const u8 *data, size_t len)
 240 {
 241         const struct ieee80211_mgmt *mgmt;
 242         struct wlantest_bss *bss;
 243         struct wlantest_sta *sta;
 244         u16 capab, status, aid;
 245
 246         mgmt = (const struct ieee80211_mgmt *) data;
 247         bss = bss_get(wt, mgmt->bssid);
 248         if (bss == NULL)
 249                 return;
 250         sta = sta_get(bss, mgmt->da);
 251         if (sta == NULL)
 252                 return;
 253
 254         if (len < 24 + 6) {
 255                 wpa_printf(MSG_INFO, "Too short Association Response frame "
 256                            "from " MACSTR, MAC2STR(mgmt->sa));
 257                 return;
 258         }
 259
 260         capab = le_to_host16(mgmt->u.assoc_resp.capab_info);
 261         status = le_to_host16(mgmt->u.assoc_resp.status_code);
 262         aid = le_to_host16(mgmt->u.assoc_resp.aid);
 263
 264         wpa_printf(MSG_DEBUG, "ASSOCRESP " MACSTR " -> " MACSTR
 265                    " (capab=0x%x status=%u aid=%u)",
 266                    MAC2STR(mgmt->sa), MAC2STR(mgmt->da), capab, status,
 267                    aid & 0x3fff);
 268
 269         if (status)
 270                 return;
 271
 272         if ((aid & 0xc000) != 0xc000) {
 273                 wpa_printf(MSG_DEBUG, "Two MSBs of the AID were not set to 1 "
 274                            "in Association Response from " MACSTR,
 275                            MAC2STR(mgmt->sa));
 276         }
 277         sta->aid = aid & 0xc000;
 278
 279         if (sta->state < STATE2) {
 280                 wpa_printf(MSG_DEBUG, "STA " MACSTR " was not in State 2 when "
 281                            "getting associated", MAC2STR(sta->addr));
 282         }
 283
 284         if (sta->state < STATE3) {
 285                 wpa_printf(MSG_DEBUG, "STA " MACSTR
 286                            " moved to State 3 with " MACSTR,
 287                            MAC2STR(sta->addr), MAC2STR(bss->bssid));
 288                 sta->state = STATE3;
 289         }
 290 }
 291
 292
 293 static void rx_mgmt_reassoc_req(struct wlantest *wt, const u8 *data,
 294                                 size_t len)
 295 {
 296         const struct ieee80211_mgmt *mgmt;
 297         struct wlantest_bss *bss;
 298         struct wlantest_sta *sta;
 299         struct ieee802_11_elems elems;
 300
 301         mgmt = (const struct ieee80211_mgmt *) data;
 302         bss = bss_get(wt, mgmt->bssid);
 303         if (bss == NULL)
 304                 return;
 305         sta = sta_get(bss, mgmt->sa);
 306         if (sta == NULL)
 307                 return;
 308
 309         if (len < 24 + 4 + ETH_ALEN) {
 310                 wpa_printf(MSG_INFO, "Too short Reassociation Request frame "
 311                            "from " MACSTR, MAC2STR(mgmt->sa));
 312                 return;
 313         }
 314
 315         wpa_printf(MSG_DEBUG, "REASSOCREQ " MACSTR " -> " MACSTR
 316                    " (capab=0x%x listen_int=%u current_ap=" MACSTR ")",
 317                    MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
 318                    le_to_host16(mgmt->u.reassoc_req.capab_info),
 319                    le_to_host16(mgmt->u.reassoc_req.listen_interval),
 320                    MAC2STR(mgmt->u.reassoc_req.current_ap));
 321
 322         if (ieee802_11_parse_elems(mgmt->u.reassoc_req.variable,
 323                                    len - (mgmt->u.reassoc_req.variable - data),
 324                                    &elems, 0) == ParseFailed) {
 325                 wpa_printf(MSG_INFO, "Invalid IEs in Reassociation Request "
 326                            "frame from " MACSTR, MAC2STR(mgmt->sa));
 327                 return;
 328         }
 329
 330         sta_update_assoc(sta, &elems);
 331 }
 332
 333
 334 static void rx_mgmt_reassoc_resp(struct wlantest *wt, const u8 *data,
 335                                  size_t len)
 336 {
 337         const struct ieee80211_mgmt *mgmt;
 338         struct wlantest_bss *bss;
 339         struct wlantest_sta *sta;
 340         u16 capab, status, aid;
 341
 342         mgmt = (const struct ieee80211_mgmt *) data;
 343         bss = bss_get(wt, mgmt->bssid);
 344         if (bss == NULL)
 345                 return;
 346         sta = sta_get(bss, mgmt->da);
 347         if (sta == NULL)
 348                 return;
 349
 350         if (len < 24 + 6) {
 351                 wpa_printf(MSG_INFO, "Too short Reassociation Response frame "
 352                            "from " MACSTR, MAC2STR(mgmt->sa));
 353                 return;
 354         }
 355
 356         capab = le_to_host16(mgmt->u.reassoc_resp.capab_info);
 357         status = le_to_host16(mgmt->u.reassoc_resp.status_code);
 358         aid = le_to_host16(mgmt->u.reassoc_resp.aid);
 359
 360         wpa_printf(MSG_DEBUG, "REASSOCRESP " MACSTR " -> " MACSTR
 361                    " (capab=0x%x status=%u aid=%u)",
 362                    MAC2STR(mgmt->sa), MAC2STR(mgmt->da), capab, status,
 363                    aid & 0x3fff);
 364
 365         if (status)
 366                 return;
 367
 368         if ((aid & 0xc000) != 0xc000) {
 369                 wpa_printf(MSG_DEBUG, "Two MSBs of the AID were not set to 1 "
 370                            "in Reassociation Response from " MACSTR,
 371                            MAC2STR(mgmt->sa));
 372         }
 373         sta->aid = aid & 0xc000;
 374
 375         if (sta->state < STATE2) {
 376                 wpa_printf(MSG_DEBUG, "STA " MACSTR " was not in State 2 when "
 377                            "getting associated", MAC2STR(sta->addr));
 378         }
 379
 380         if (sta->state < STATE3) {
 381                 wpa_printf(MSG_DEBUG, "STA " MACSTR
 382                            " moved to State 3 with " MACSTR,
 383                            MAC2STR(sta->addr), MAC2STR(bss->bssid));
 384                 sta->state = STATE3;
 385         }
 386 }
 387
 388
 389 static void rx_mgmt_disassoc(struct wlantest *wt, const u8 *data, size_t len,
 390                              int valid)
 391 {
 392         const struct ieee80211_mgmt *mgmt;
 393         struct wlantest_bss *bss;
 394         struct wlantest_sta *sta;
 395
 396         mgmt = (const struct ieee80211_mgmt *) data;
 397         bss = bss_get(wt, mgmt->bssid);
 398         if (bss == NULL)
 399                 return;
 400         if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
 401                 sta = sta_get(bss, mgmt->da);
 402         else
 403                 sta = sta_get(bss, mgmt->sa);
 404         if (sta == NULL)
 405                 return;
 406
 407         if (len < 24 + 2) {
 408                 wpa_printf(MSG_INFO, "Too short Disassociation frame from "
 409                            MACSTR, MAC2STR(mgmt->sa));
 410                 return;
 411         }
 412
 413         wpa_printf(MSG_DEBUG, "DISASSOC " MACSTR " -> " MACSTR
 414                    " (reason=%u)",
 415                    MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
 416                    le_to_host16(mgmt->u.disassoc.reason_code));
 417         wpa_hexdump(MSG_MSGDUMP, "DISASSOC payload", data + 24, len - 24);
 418
 419         if (!valid) {
 420                 wpa_printf(MSG_INFO, "Do not change STA " MACSTR " State "
 421                            "since Disassociation frame was not protected "
 422                            "correctly", MAC2STR(sta->addr));
 423                 return;
 424         }
 425
 426         if (sta->state < STATE2) {
 427                 wpa_printf(MSG_DEBUG, "STA " MACSTR " was not in State 2 or 3 "
 428                            "when getting disassociated", MAC2STR(sta->addr));
 429         }
 430
 431         if (sta->state > STATE2) {
 432                 wpa_printf(MSG_DEBUG, "STA " MACSTR
 433                            " moved to State 2 with " MACSTR,
 434                            MAC2STR(sta->addr), MAC2STR(bss->bssid));
 435                 sta->state = STATE2;
 436         }
 437 }
 438
 439
 440 static void rx_mgmt_action_sa_query(struct wlantest *wt,
 441                                     struct wlantest_sta *sta,
 442                                     const struct ieee80211_mgmt *mgmt,
 443                                     size_t len)
 444 {
 445         const u8 *rx_id;
 446         u8 *id;
 447
 448         if (len < 24 + 2 + WLAN_SA_QUERY_TR_ID_LEN) {
 449                 wpa_printf(MSG_INFO, "Too short SA Query frame from " MACSTR,
 450                            MAC2STR(mgmt->sa));
 451                 return;
 452         }
 453
 454         if (len > 24 + 2 + WLAN_SA_QUERY_TR_ID_LEN) {
 455                 size_t elen = len - (24 + 2 + WLAN_SA_QUERY_TR_ID_LEN);
 456                 wpa_printf(MSG_INFO, "Unexpected %u octets of extra data at "
 457                            "the end of SA Query frame from " MACSTR,
 458                            (unsigned) elen, MAC2STR(mgmt->sa));
 459                 wpa_hexdump(MSG_INFO, "SA Query extra data",
 460                             ((const u8 *) mgmt) + len - elen, elen);
 461         }
 462
 463         switch (mgmt->u.action.u.sa_query_req.action) {
 464         case WLAN_SA_QUERY_REQUEST:
 465                 rx_id = (const u8 *) mgmt->u.action.u.sa_query_req.trans_id;
 466                 if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
 467                         id = sta->ap_sa_query_tr;
 468                 else
 469                         id = sta->sta_sa_query_tr;
 470                 wpa_printf(MSG_INFO, "SA Query Request " MACSTR " -> " MACSTR
 471                            " (trans_id=%02x%02x)",
 472                            MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
 473                            rx_id[0], rx_id[1]);
 474                 os_memcpy(id, mgmt->u.action.u.sa_query_req.trans_id, 2);
 475                 break;
 476         case WLAN_SA_QUERY_RESPONSE:
 477                 rx_id = (const u8 *) mgmt->u.action.u.sa_query_resp.trans_id;
 478                 if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
 479                         id = sta->sta_sa_query_tr;
 480                 else
 481                         id = sta->ap_sa_query_tr;
 482                 wpa_printf(MSG_INFO, "SA Query Response " MACSTR " -> " MACSTR
 483                            " (trans_id=%02x%02x; %s)",
 484                            MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
 485                            rx_id[0], rx_id[1],
 486                            os_memcmp(rx_id, id, 2) == 0 ?
 487                            "match" : "mismatch");
 488                 break;
 489         default:
 490                 wpa_printf(MSG_INFO, "Unexpected SA Query action value %u "
 491                            "from " MACSTR,
 492                            mgmt->u.action.u.sa_query_req.action,
 493                            MAC2STR(mgmt->sa));
 494         }
 495 }
 496
 497
 498 static void rx_mgmt_action(struct wlantest *wt, const u8 *data, size_t len)
 499 {
 500         const struct ieee80211_mgmt *mgmt;
 501         struct wlantest_bss *bss;
 502         struct wlantest_sta *sta;
 503
 504         mgmt = (const struct ieee80211_mgmt *) data;
 505         if (mgmt->da[0] & 0x01)
 506                 return; /* Ignore group addressed Action frames for now */
 507         bss = bss_get(wt, mgmt->bssid);
 508         if (bss == NULL)
 509                 return;
 510         if (os_memcmp(mgmt->sa, mgmt->bssid, ETH_ALEN) == 0)
 511                 sta = sta_get(bss, mgmt->da);
 512         else
 513                 sta = sta_get(bss, mgmt->sa);
 514         if (sta == NULL)
 515                 return;
 516
 517         if (len < 24 + 1) {
 518                 wpa_printf(MSG_INFO, "Too short Action frame from "
 519                            MACSTR, MAC2STR(mgmt->sa));
 520                 return;
 521         }
 522
 523         wpa_printf(MSG_DEBUG, "ACTION " MACSTR " -> " MACSTR
 524                    " (category=%u)",
 525                    MAC2STR(mgmt->sa), MAC2STR(mgmt->da),
 526                    mgmt->u.action.category);
 527         wpa_hexdump(MSG_MSGDUMP, "ACTION payload", data + 24, len - 24);
 528
 529         if (mgmt->u.action.category != WLAN_ACTION_PUBLIC &&
 530             sta->state < STATE3) {
 531                 wpa_printf(MSG_INFO, "Action frame sent when STA is not in "
 532                            "State 3 (SA=" MACSTR " DATA=" MACSTR ")",
 533                            MAC2STR(mgmt->sa), MAC2STR(mgmt->da));
 534         }
 535
 536         switch (mgmt->u.action.category) {
 537         case WLAN_ACTION_SA_QUERY:
 538                 rx_mgmt_action_sa_query(wt, sta, mgmt, len);
 539                 break;
 540         }
 541 }
 542
 543
 544 static int check_mmie_mic(const u8 *igtk, const u8 *data, size_t len)
 545 {
 546         u8 *buf;
 547         u8 mic[16];
 548         u16 fc;
 549         const struct ieee80211_hdr *hdr;
 550
 551         buf = os_malloc(len + 20 - 24);
 552         if (buf == NULL)
 553                 return -1;
 554
 555         /* BIP AAD: FC(masked) A1 A2 A3 */
 556         hdr = (const struct ieee80211_hdr *) data;
 557         fc = le_to_host16(hdr->frame_control);
 558         fc &= ~(WLAN_FC_RETRY | WLAN_FC_PWRMGT | WLAN_FC_MOREDATA);
 559         WPA_PUT_LE16(buf, fc);
 560         os_memcpy(buf + 2, hdr->addr1, 3 * ETH_ALEN);
 561
 562         /* Frame body with MMIE MIC masked to zero */
 563         os_memcpy(buf + 20, data + 24, len - 24 - 8);
 564         os_memset(buf + 20 + len - 24 - 8, 0, 8);
 565
 566         wpa_hexdump(MSG_MSGDUMP, "BIP: AAD|Body(masked)", buf, len + 20 - 24);
 567         /* MIC = L(AES-128-CMAC(AAD || Frame Body(masked)), 0, 64) */
 568         if (omac1_aes_128(igtk, buf, len + 20 - 24, mic) < 0) {
 569                 os_free(buf);
 570                 return -1;
 571         }
 572
 573         os_free(buf);
 574
 575         if (os_memcmp(data + len - 8, mic, 8) != 0)
 576                 return -1;
 577
 578         return 0;
 579 }
 580
 581
 582 static int check_bip(struct wlantest *wt, const u8 *data, size_t len)
 583 {
 584         const struct ieee80211_mgmt *mgmt;
 585         u16 fc, stype;
 586         const u8 *mmie;
 587         int keyid;
 588         struct wlantest_bss *bss;
 589
 590         mgmt = (const struct ieee80211_mgmt *) data;
 591         fc = le_to_host16(mgmt->frame_control);
 592         stype = WLAN_FC_GET_STYPE(fc);
 593
 594         if (stype == WLAN_FC_STYPE_ACTION) {
 595                 if (len < 24 + 1)
 596                         return 0;
 597                 if (mgmt->u.action.category == WLAN_ACTION_PUBLIC)
 598                         return 0; /* Not a robust management frame */
 599         }
 600
 601         bss = bss_get(wt, mgmt->bssid);
 602         if (bss == NULL)
 603                 return 0; /* No key known yet */
 604
 605         if (len < 24 + 18 || data[len - 18] != WLAN_EID_MMIE ||
 606             data[len - 17] != 16) {
 607                 /* No MMIE */
 608                 /* TODO: use MFPC flag in RSN IE instead of IGTK flags */
 609                 if (bss->igtk_set[4] || bss->igtk_set[5]) {
 610                         wpa_printf(MSG_INFO, "Robust group-addressed "
 611                                    "management frame sent without BIP by "
 612                                    MACSTR, MAC2STR(mgmt->sa));
 613                         return -1;
 614                 }
 615                 return 0;
 616         }
 617
 618         mmie = data + len - 16;
 619         keyid = WPA_GET_LE16(mmie);
 620         if (keyid < 4 || keyid > 5) {
 621                 wpa_printf(MSG_INFO, "Unexpected MMIE KeyID %u from " MACSTR,
 622                            keyid, MAC2STR(mgmt->sa));
 623                 return 0;
 624         }
 625         wpa_printf(MSG_DEBUG, "MMIE KeyID %u", keyid);
 626         wpa_hexdump(MSG_MSGDUMP, "MMIE IPN", mmie + 2, 6);
 627         wpa_hexdump(MSG_MSGDUMP, "MMIE MIC", mmie + 8, 8);
 628
 629         if (!bss->igtk_set[keyid]) {
 630                 wpa_printf(MSG_DEBUG, "No IGTK known to validate BIP frame");
 631                 return 0;
 632         }
 633
 634         if (os_memcmp(mmie + 2, bss->ipn[keyid], 6) <= 0) {
 635                 wpa_printf(MSG_INFO, "BIP replay detected: SA=" MACSTR,
 636                            MAC2STR(mgmt->sa));
 637                 wpa_hexdump(MSG_INFO, "RX IPN", mmie + 2, 6);
 638                 wpa_hexdump(MSG_INFO, "Last RX IPN", bss->ipn[keyid], 6);
 639         }
 640
 641         if (check_mmie_mic(bss->igtk[keyid], data, len) < 0) {
 642                 wpa_printf(MSG_INFO, "Invalid MMIE MIC in a frame from "
 643                            MACSTR, MAC2STR(mgmt->sa));
 644                 return -1;
 645         }
 646
 647         wpa_printf(MSG_DEBUG, "Valid MMIE MIC");
 648         os_memcpy(bss->ipn[keyid], mmie + 2, 6);
 649
 650         return 0;
 651 }
 652
 653
 654 static u8 * mgmt_ccmp_decrypt(struct wlantest *wt, const u8 *data, size_t len,
 655                               size_t *dlen)
 656 {
 657         struct wlantest_bss *bss;
 658         struct wlantest_sta *sta;
 659         const struct ieee80211_hdr *hdr;
 660         int keyid;
 661         u8 *decrypted, *frame;
 662         u8 pn[6], *rsc;
 663
 664         hdr = (const struct ieee80211_hdr *) data;
 665         bss = bss_get(wt, hdr->addr3);
 666         if (bss == NULL)
 667                 return NULL;
 668         if (os_memcmp(hdr->addr1, hdr->addr3, ETH_ALEN) == 0)
 669                 sta = sta_get(bss, hdr->addr2);
 670         else
 671                 sta = sta_get(bss, hdr->addr1);
 672         if (sta == NULL || !sta->ptk_set) {
 673                 wpa_printf(MSG_MSGDUMP, "No PTK known to decrypt the frame");
 674                 return NULL;
 675         }
 676
 677         keyid = data[3] >> 6;
 678         if (keyid != 0) {
 679                 wpa_printf(MSG_INFO, "Unexpected non-zero KeyID %d in "
 680                            "individually addressed Management frame from "
 681                            MACSTR, keyid, MAC2STR(hdr->addr2));
 682         }
 683
 684         if (os_memcmp(hdr->addr1, hdr->addr3, ETH_ALEN) == 0)
 685                 rsc = sta->rsc_tods[16];
 686         else
 687                 rsc = sta->rsc_fromds[16];
 688
 689         ccmp_get_pn(pn, data + 24);
 690         if (os_memcmp(pn, rsc, 6) <= 0) {
 691                 wpa_printf(MSG_INFO, "CCMP/TKIP replay detected: SA=" MACSTR,
 692                            MAC2STR(hdr->addr2));
 693                 wpa_hexdump(MSG_INFO, "RX PN", pn, 6);
 694                 wpa_hexdump(MSG_INFO, "RSC", rsc, 6);
 695         }
 696
 697         decrypted = ccmp_decrypt(sta->ptk.tk1, hdr, data + 24, len - 24, dlen);
 698         if (decrypted)
 699                 os_memcpy(rsc, pn, 6);
 700
 701         frame = os_malloc(24 + *dlen);
 702         if (frame) {
 703                 os_memcpy(frame, data, 24);
 704                 os_memcpy(frame + 24, decrypted, *dlen);
 705                 *dlen += 24;
 706         }
 707
 708         os_free(decrypted);
 709
 710         return frame;
 711 }
 712
 713
 714 void rx_mgmt(struct wlantest *wt, const u8 *data, size_t len)
 715 {
 716         const struct ieee80211_hdr *hdr;
 717         u16 fc, stype;
 718         int valid = 1;
 719         u8 *decrypted = NULL;
 720         size_t dlen;
 721
 722         if (len < 24)
 723                 return;
 724
 725         hdr = (const struct ieee80211_hdr *) data;
 726         fc = le_to_host16(hdr->frame_control);
 727         wt->rx_mgmt++;
 728         stype = WLAN_FC_GET_STYPE(fc);
 729
 730         if ((hdr->addr1[0] & 0x01) &&
 731             (stype == WLAN_FC_STYPE_DEAUTH ||
 732              stype == WLAN_FC_STYPE_DISASSOC ||
 733              stype == WLAN_FC_STYPE_ACTION))
 734                 check_bip(wt, data, len);
 735
 736         wpa_printf((stype == WLAN_FC_STYPE_BEACON ||
 737                     stype == WLAN_FC_STYPE_PROBE_RESP ||
 738                     stype == WLAN_FC_STYPE_PROBE_REQ) ?
 739                    MSG_EXCESSIVE : MSG_MSGDUMP,
 740                    "MGMT %s%s%s DA=" MACSTR " SA=" MACSTR " BSSID=" MACSTR,
 741                    mgmt_stype(stype),
 742                    fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
 743                    fc & WLAN_FC_ISWEP ? " Prot" : "",
 744                    MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
 745                    MAC2STR(hdr->addr3));
 746
 747         if ((fc & WLAN_FC_ISWEP) &&
 748             !(hdr->addr1[0] & 0x01) &&
 749             (stype == WLAN_FC_STYPE_DEAUTH ||
 750              stype == WLAN_FC_STYPE_DISASSOC ||
 751              stype == WLAN_FC_STYPE_ACTION)) {
 752                 decrypted = mgmt_ccmp_decrypt(wt, data, len, &dlen);
 753                 if (decrypted) {
 754                         write_pcap_decrypted(wt, decrypted, dlen, NULL, 0);
 755                         data = decrypted;
 756                         len = dlen;
 757                 } else
 758                         valid = 0;
 759         }
 760
 761         /* TODO: verify that robust management frames are protected if MFP was
 762          * negotiated */
 763
 764         switch (stype) {
 765         case WLAN_FC_STYPE_BEACON:
 766                 rx_mgmt_beacon(wt, data, len);
 767                 break;
 768         case WLAN_FC_STYPE_PROBE_RESP:
 769                 rx_mgmt_probe_resp(wt, data, len);
 770                 break;
 771         case WLAN_FC_STYPE_AUTH:
 772                 rx_mgmt_auth(wt, data, len);
 773                 break;
 774         case WLAN_FC_STYPE_DEAUTH:
 775                 rx_mgmt_deauth(wt, data, len, valid);
 776                 break;
 777         case WLAN_FC_STYPE_ASSOC_REQ:
 778                 rx_mgmt_assoc_req(wt, data, len);
 779                 break;
 780         case WLAN_FC_STYPE_ASSOC_RESP:
 781                 rx_mgmt_assoc_resp(wt, data, len);
 782                 break;
 783         case WLAN_FC_STYPE_REASSOC_REQ:
 784                 rx_mgmt_reassoc_req(wt, data, len);
 785                 break;
 786         case WLAN_FC_STYPE_REASSOC_RESP:
 787                 rx_mgmt_reassoc_resp(wt, data, len);
 788                 break;
 789         case WLAN_FC_STYPE_DISASSOC:
 790                 rx_mgmt_disassoc(wt, data, len, valid);
 791                 break;
 792         case WLAN_FC_STYPE_ACTION:
 793                 if (valid)
 794                         rx_mgmt_action(wt, data, len);
 795                 break;
 796         }
 797
 798         os_free(decrypted);
 799 }