contrib/hostapd-0.5.8/driver.c

   1 /*
   2  * hostapd / Kernel driver communication with Linux Host AP driver
   3  * Copyright (c) 2002-2005, 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 "includes.h"
  16 #include <sys/ioctl.h>
  17
  18 #ifdef USE_KERNEL_HEADERS
  19 #include <asm/types.h>
  20 #include <linux/if_packet.h>
  21 #include <linux/if_ether.h>   /* The L2 protocols */
  22 #include <linux/if_arp.h>
  23 #include <linux/wireless.h>
  24 #else /* USE_KERNEL_HEADERS */
  25 #include <net/if_arp.h>
  26 #include <netpacket/packet.h>
  27 #include "wireless_copy.h"
  28 #endif /* USE_KERNEL_HEADERS */
  29
  30 #include "hostapd.h"
  31 #include "driver.h"
  32 #include "ieee802_1x.h"
  33 #include "eloop.h"
  34 #include "priv_netlink.h"
  35 #include "ieee802_11.h"
  36 #include "sta_info.h"
  37 #include "hostap_common.h"
  38 #include "hw_features.h"
  39
  40
  41 struct hostap_driver_data {
  42         struct driver_ops ops;
  43         struct hostapd_data *hapd;
  44
  45         char iface[IFNAMSIZ + 1];
  46         int sock; /* raw packet socket for driver access */
  47         int ioctl_sock; /* socket for ioctl() use */
  48         int wext_sock; /* socket for wireless events */
  49
  50         int we_version;
  51 };
  52
  53 static const struct driver_ops hostap_driver_ops;
  54
  55
  56 static int hostapd_ioctl(void *priv, struct prism2_hostapd_param *param,
  57                          int len);
  58 static int hostap_set_iface_flags(void *priv, int dev_up);
  59
  60 static void handle_data(struct hostapd_data *hapd, u8 *buf, size_t len,
  61                         u16 stype)
  62 {
  63         struct ieee80211_hdr *hdr;
  64         u16 fc, ethertype;
  65         u8 *pos, *sa;
  66         size_t left;
  67         struct sta_info *sta;
  68
  69         if (len < sizeof(struct ieee80211_hdr))
  70                 return;
  71
  72         hdr = (struct ieee80211_hdr *) buf;
  73         fc = le_to_host16(hdr->frame_control);
  74
  75         if ((fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)) != WLAN_FC_TODS) {
  76                 printf("Not ToDS data frame (fc=0x%04x)\n", fc);
  77                 return;
  78         }
  79
  80         sa = hdr->addr2;
  81         sta = ap_get_sta(hapd, sa);
  82         if (!sta || !(sta->flags & WLAN_STA_ASSOC)) {
  83                 printf("Data frame from not associated STA " MACSTR "\n",
  84                        MAC2STR(sa));
  85                 if (sta && (sta->flags & WLAN_STA_AUTH))
  86                         hostapd_sta_disassoc(
  87                                 hapd, sa,
  88                                 WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
  89                 else
  90                         hostapd_sta_deauth(
  91                                 hapd, sa,
  92                                 WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
  93                 return;
  94         }
  95
  96         pos = (u8 *) (hdr + 1);
  97         left = len - sizeof(*hdr);
  98
  99         if (left < sizeof(rfc1042_header)) {
 100                 printf("Too short data frame\n");
 101                 return;
 102         }
 103
 104         if (memcmp(pos, rfc1042_header, sizeof(rfc1042_header)) != 0) {
 105                 printf("Data frame with no RFC1042 header\n");
 106                 return;
 107         }
 108         pos += sizeof(rfc1042_header);
 109         left -= sizeof(rfc1042_header);
 110
 111         if (left < 2) {
 112                 printf("No ethertype in data frame\n");
 113                 return;
 114         }
 115
 116         ethertype = *pos++ << 8;
 117         ethertype |= *pos++;
 118         left -= 2;
 119         switch (ethertype) {
 120         case ETH_P_PAE:
 121                 ieee802_1x_receive(hapd, sa, pos, left);
 122                 break;
 123
 124         default:
 125                 printf("Unknown ethertype 0x%04x in data frame\n", ethertype);
 126                 break;
 127         }
 128 }
 129
 130
 131 static void handle_tx_callback(struct hostapd_data *hapd, u8 *buf, size_t len,
 132                                int ok)
 133 {
 134         struct ieee80211_hdr *hdr;
 135         u16 fc, type, stype;
 136         struct sta_info *sta;
 137
 138         hdr = (struct ieee80211_hdr *) buf;
 139         fc = le_to_host16(hdr->frame_control);
 140
 141         type = WLAN_FC_GET_TYPE(fc);
 142         stype = WLAN_FC_GET_STYPE(fc);
 143
 144         switch (type) {
 145         case WLAN_FC_TYPE_MGMT:
 146                 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
 147                               "MGMT (TX callback) %s\n", ok ? "ACK" : "fail");
 148                 ieee802_11_mgmt_cb(hapd, buf, len, stype, ok);
 149                 break;
 150         case WLAN_FC_TYPE_CTRL:
 151                 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
 152                               "CTRL (TX callback) %s\n", ok ? "ACK" : "fail");
 153                 break;
 154         case WLAN_FC_TYPE_DATA:
 155                 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
 156                               "DATA (TX callback) %s\n", ok ? "ACK" : "fail");
 157                 sta = ap_get_sta(hapd, hdr->addr1);
 158                 if (sta && sta->flags & WLAN_STA_PENDING_POLL) {
 159                         HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "STA " MACSTR
 160                                       " %s pending activity poll\n",
 161                                       MAC2STR(sta->addr),
 162                                       ok ? "ACKed" : "did not ACK");
 163                         if (ok)
 164                                 sta->flags &= ~WLAN_STA_PENDING_POLL;
 165                 }
 166                 if (sta)
 167                         ieee802_1x_tx_status(hapd, sta, buf, len, ok);
 168                 break;
 169         default:
 170                 printf("unknown TX callback frame type %d\n", type);
 171                 break;
 172         }
 173 }
 174
 175
 176 static void handle_frame(struct hostapd_data *hapd, u8 *buf, size_t len)
 177 {
 178         struct ieee80211_hdr *hdr;
 179         u16 fc, extra_len, type, stype;
 180         unsigned char *extra = NULL;
 181         size_t data_len = len;
 182         int ver;
 183
 184         /* PSPOLL is only 16 bytes, but driver does not (at least yet) pass
 185          * these to user space */
 186         if (len < 24) {
 187                 HOSTAPD_DEBUG(HOSTAPD_DEBUG_VERBOSE, "handle_frame: too short "
 188                               "(%lu)\n", (unsigned long) len);
 189                 return;
 190         }
 191
 192         hdr = (struct ieee80211_hdr *) buf;
 193         fc = le_to_host16(hdr->frame_control);
 194         type = WLAN_FC_GET_TYPE(fc);
 195         stype = WLAN_FC_GET_STYPE(fc);
 196
 197         if (type != WLAN_FC_TYPE_MGMT || stype != WLAN_FC_STYPE_BEACON ||
 198             hapd->conf->debug >= HOSTAPD_DEBUG_EXCESSIVE) {
 199                 wpa_hexdump(MSG_MSGDUMP, "Received management frrame",
 200                             buf, len);
 201         }
 202
 203         ver = fc & WLAN_FC_PVER;
 204
 205         /* protocol version 3 is reserved for indicating extra data after the
 206          * payload, version 2 for indicating ACKed frame (TX callbacks), and
 207          * version 1 for indicating failed frame (no ACK, TX callbacks) */
 208         if (ver == 3) {
 209                 u8 *pos = buf + len - 2;
 210                 extra_len = (u16) pos[1] << 8 | pos[0];
 211                 printf("extra data in frame (elen=%d)\n", extra_len);
 212                 if ((size_t) extra_len + 2 > len) {
 213                         printf("  extra data overflow\n");
 214                         return;
 215                 }
 216                 len -= extra_len + 2;
 217                 extra = buf + len;
 218         } else if (ver == 1 || ver == 2) {
 219                 handle_tx_callback(hapd, buf, data_len, ver == 2 ? 1 : 0);
 220                 return;
 221         } else if (ver != 0) {
 222                 printf("unknown protocol version %d\n", ver);
 223                 return;
 224         }
 225
 226         switch (type) {
 227         case WLAN_FC_TYPE_MGMT:
 228                 HOSTAPD_DEBUG(stype == WLAN_FC_STYPE_BEACON ?
 229                               HOSTAPD_DEBUG_EXCESSIVE : HOSTAPD_DEBUG_VERBOSE,
 230                               "MGMT\n");
 231                 ieee802_11_mgmt(hapd, buf, data_len, stype, NULL);
 232                 break;
 233         case WLAN_FC_TYPE_CTRL:
 234                 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "CTRL\n");
 235                 break;
 236         case WLAN_FC_TYPE_DATA:
 237                 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "DATA\n");
 238                 handle_data(hapd, buf, data_len, stype);
 239                 break;
 240         default:
 241                 printf("unknown frame type %d\n", type);
 242                 break;
 243         }
 244 }
 245
 246
 247 static void handle_read(int sock, void *eloop_ctx, void *sock_ctx)
 248 {
 249         struct hostapd_data *hapd = (struct hostapd_data *) eloop_ctx;
 250         int len;
 251         unsigned char buf[3000];
 252
 253         len = recv(sock, buf, sizeof(buf), 0);
 254         if (len < 0) {
 255                 perror("recv");
 256                 return;
 257         }
 258
 259         handle_frame(hapd, buf, len);
 260 }
 261
 262
 263 static int hostap_init_sockets(struct hostap_driver_data *drv)
 264 {
 265         struct hostapd_data *hapd = drv->hapd;
 266         struct ifreq ifr;
 267         struct sockaddr_ll addr;
 268
 269         drv->sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
 270         if (drv->sock < 0) {
 271                 perror("socket[PF_PACKET,SOCK_RAW]");
 272                 return -1;
 273         }
 274
 275         if (eloop_register_read_sock(drv->sock, handle_read, drv->hapd, NULL))
 276         {
 277                 printf("Could not register read socket\n");
 278                 return -1;
 279         }
 280
 281         memset(&ifr, 0, sizeof(ifr));
 282         snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%sap", drv->iface);
 283         if (ioctl(drv->sock, SIOCGIFINDEX, &ifr) != 0) {
 284                 perror("ioctl(SIOCGIFINDEX)");
 285                 return -1;
 286         }
 287
 288         if (hostap_set_iface_flags(drv, 1)) {
 289                 return -1;
 290         }
 291
 292         memset(&addr, 0, sizeof(addr));
 293         addr.sll_family = AF_PACKET;
 294         addr.sll_ifindex = ifr.ifr_ifindex;
 295         HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
 296                       "Opening raw packet socket for ifindex %d\n",
 297                       addr.sll_ifindex);
 298
 299         if (bind(drv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 300                 perror("bind");
 301                 return -1;
 302         }
 303
 304         memset(&ifr, 0, sizeof(ifr));
 305         snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", drv->iface);
 306         if (ioctl(drv->sock, SIOCGIFHWADDR, &ifr) != 0) {
 307                 perror("ioctl(SIOCGIFHWADDR)");
 308                 return -1;
 309         }
 310
 311         if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
 312                 printf("Invalid HW-addr family 0x%04x\n",
 313                        ifr.ifr_hwaddr.sa_family);
 314                 return -1;
 315         }
 316         memcpy(drv->hapd->own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
 317
 318         return 0;
 319 }
 320
 321
 322 static int hostap_send_mgmt_frame(void *priv, const void *msg, size_t len,
 323                                   int flags)
 324 {
 325         struct hostap_driver_data *drv = priv;
 326
 327         return send(drv->sock, msg, len, flags);
 328 }
 329
 330
 331 static int hostap_send_eapol(void *priv, const u8 *addr, const u8 *data,
 332                              size_t data_len, int encrypt, const u8 *own_addr)
 333 {
 334         struct hostap_driver_data *drv = priv;
 335         struct ieee80211_hdr *hdr;
 336         size_t len;
 337         u8 *pos;
 338         int res;
 339
 340         len = sizeof(*hdr) + sizeof(rfc1042_header) + 2 + data_len;
 341         hdr = wpa_zalloc(len);
 342         if (hdr == NULL) {
 343                 printf("malloc() failed for hostapd_send_data(len=%lu)\n",
 344                        (unsigned long) len);
 345                 return -1;
 346         }
 347
 348         hdr->frame_control =
 349                 IEEE80211_FC(WLAN_FC_TYPE_DATA, WLAN_FC_STYPE_DATA);
 350         hdr->frame_control |= host_to_le16(WLAN_FC_FROMDS);
 351         /* Request TX callback */
 352         hdr->frame_control |= host_to_le16(BIT(1));
 353         if (encrypt)
 354                 hdr->frame_control |= host_to_le16(WLAN_FC_ISWEP);
 355         memcpy(hdr->IEEE80211_DA_FROMDS, addr, ETH_ALEN);
 356         memcpy(hdr->IEEE80211_BSSID_FROMDS, own_addr, ETH_ALEN);
 357         memcpy(hdr->IEEE80211_SA_FROMDS, own_addr, ETH_ALEN);
 358
 359         pos = (u8 *) (hdr + 1);
 360         memcpy(pos, rfc1042_header, sizeof(rfc1042_header));
 361         pos += sizeof(rfc1042_header);
 362         *((u16 *) pos) = htons(ETH_P_PAE);
 363         pos += 2;
 364         memcpy(pos, data, data_len);
 365
 366         res = hostap_send_mgmt_frame(drv, (u8 *) hdr, len, 0);
 367         free(hdr);
 368
 369         if (res < 0) {
 370                 perror("hostapd_send_eapol: send");
 371                 printf("hostapd_send_eapol - packet len: %lu - failed\n",
 372                        (unsigned long) len);
 373         }
 374
 375         return res;
 376 }
 377
 378
 379 static int hostap_sta_set_flags(void *priv, const u8 *addr,
 380                                 int flags_or, int flags_and)
 381 {
 382         struct hostap_driver_data *drv = priv;
 383         struct prism2_hostapd_param param;
 384
 385         memset(&param, 0, sizeof(param));
 386         param.cmd = PRISM2_HOSTAPD_SET_FLAGS_STA;
 387         memcpy(param.sta_addr, addr, ETH_ALEN);
 388         param.u.set_flags_sta.flags_or = flags_or;
 389         param.u.set_flags_sta.flags_and = flags_and;
 390         return hostapd_ioctl(drv, &param, sizeof(param));
 391 }
 392
 393
 394 static int hostap_set_iface_flags(void *priv, int dev_up)
 395 {
 396         struct hostap_driver_data *drv = priv;
 397         struct ifreq ifr;
 398
 399         if (drv->ioctl_sock < 0)
 400                 return -1;
 401
 402         memset(&ifr, 0, sizeof(ifr));
 403         snprintf(ifr.ifr_name, IFNAMSIZ, "%sap", drv->iface);
 404
 405         if (ioctl(drv->ioctl_sock, SIOCGIFFLAGS, &ifr) != 0) {
 406                 perror("ioctl[SIOCGIFFLAGS]");
 407                 return -1;
 408         }
 409
 410         if (dev_up)
 411                 ifr.ifr_flags |= IFF_UP;
 412         else
 413                 ifr.ifr_flags &= ~IFF_UP;
 414
 415         if (ioctl(drv->ioctl_sock, SIOCSIFFLAGS, &ifr) != 0) {
 416                 perror("ioctl[SIOCSIFFLAGS]");
 417                 return -1;
 418         }
 419
 420         if (dev_up) {
 421                 memset(&ifr, 0, sizeof(ifr));
 422                 snprintf(ifr.ifr_name, IFNAMSIZ, "%sap", drv->iface);
 423                 ifr.ifr_mtu = HOSTAPD_MTU;
 424                 if (ioctl(drv->ioctl_sock, SIOCSIFMTU, &ifr) != 0) {
 425                         perror("ioctl[SIOCSIFMTU]");
 426                         printf("Setting MTU failed - trying to survive with "
 427                                "current value\n");
 428                 }
 429         }
 430
 431         return 0;
 432 }
 433
 434
 435 static int hostapd_ioctl(void *priv, struct prism2_hostapd_param *param,
 436                          int len)
 437 {
 438         struct hostap_driver_data *drv = priv;
 439         struct iwreq iwr;
 440
 441         memset(&iwr, 0, sizeof(iwr));
 442         strncpy(iwr.ifr_name, drv->iface, IFNAMSIZ);
 443         iwr.u.data.pointer = (caddr_t) param;
 444         iwr.u.data.length = len;
 445
 446         if (ioctl(drv->ioctl_sock, PRISM2_IOCTL_HOSTAPD, &iwr) < 0) {
 447                 perror("ioctl[PRISM2_IOCTL_HOSTAPD]");
 448                 return -1;
 449         }
 450
 451         return 0;
 452 }
 453
 454
 455 static int hostap_set_encryption(const char *ifname, void *priv,
 456                                  const char *alg, const u8 *addr,
 457                                  int idx, const u8 *key, size_t key_len,
 458                                  int txkey)
 459 {
 460         struct hostap_driver_data *drv = priv;
 461         struct prism2_hostapd_param *param;
 462         u8 *buf;
 463         size_t blen;
 464         int ret = 0;
 465
 466         blen = sizeof(*param) + key_len;
 467         buf = wpa_zalloc(blen);
 468         if (buf == NULL)
 469                 return -1;
 470
 471         param = (struct prism2_hostapd_param *) buf;
 472         param->cmd = PRISM2_SET_ENCRYPTION;
 473         if (addr == NULL)
 474                 memset(param->sta_addr, 0xff, ETH_ALEN);
 475         else
 476                 memcpy(param->sta_addr, addr, ETH_ALEN);
 477         strncpy((char *) param->u.crypt.alg, alg, HOSTAP_CRYPT_ALG_NAME_LEN);
 478         param->u.crypt.flags = txkey ? HOSTAP_CRYPT_FLAG_SET_TX_KEY : 0;
 479         param->u.crypt.idx = idx;
 480         param->u.crypt.key_len = key_len;
 481         memcpy((u8 *) (param + 1), key, key_len);
 482
 483         if (hostapd_ioctl(drv, param, blen)) {
 484                 printf("Failed to set encryption.\n");
 485                 ret = -1;
 486         }
 487         free(buf);
 488
 489         return ret;
 490 }
 491
 492
 493 static int hostap_get_seqnum(const char *ifname, void *priv, const u8 *addr,
 494                              int idx, u8 *seq)
 495 {
 496         struct hostap_driver_data *drv = priv;
 497         struct prism2_hostapd_param *param;
 498         u8 *buf;
 499         size_t blen;
 500         int ret = 0;
 501
 502         blen = sizeof(*param) + 32;
 503         buf = wpa_zalloc(blen);
 504         if (buf == NULL)
 505                 return -1;
 506
 507         param = (struct prism2_hostapd_param *) buf;
 508         param->cmd = PRISM2_GET_ENCRYPTION;
 509         if (addr == NULL)
 510                 memset(param->sta_addr, 0xff, ETH_ALEN);
 511         else
 512                 memcpy(param->sta_addr, addr, ETH_ALEN);
 513         param->u.crypt.idx = idx;
 514
 515         if (hostapd_ioctl(drv, param, blen)) {
 516                 printf("Failed to get encryption.\n");
 517                 ret = -1;
 518         } else {
 519                 memcpy(seq, param->u.crypt.seq, 8);
 520         }
 521         free(buf);
 522
 523         return ret;
 524 }
 525
 526
 527 static int hostap_ioctl_prism2param(void *priv, int param, int value)
 528 {
 529         struct hostap_driver_data *drv = priv;
 530         struct iwreq iwr;
 531         int *i;
 532
 533         memset(&iwr, 0, sizeof(iwr));
 534         strncpy(iwr.ifr_name, drv->iface, IFNAMSIZ);
 535         i = (int *) iwr.u.name;
 536         *i++ = param;
 537         *i++ = value;
 538
 539         if (ioctl(drv->ioctl_sock, PRISM2_IOCTL_PRISM2_PARAM, &iwr) < 0) {
 540                 perror("ioctl[PRISM2_IOCTL_PRISM2_PARAM]");
 541                 return -1;
 542         }
 543
 544         return 0;
 545 }
 546
 547
 548 static int hostap_set_ieee8021x(const char *ifname, void *priv, int enabled)
 549 {
 550         struct hostap_driver_data *drv = priv;
 551
 552         /* enable kernel driver support for IEEE 802.1X */
 553         if (hostap_ioctl_prism2param(drv, PRISM2_PARAM_IEEE_802_1X, enabled)) {
 554                 printf("Could not setup IEEE 802.1X support in kernel driver."
 555                        "\n");
 556                 return -1;
 557         }
 558
 559         if (!enabled)
 560                 return 0;
 561
 562         /* use host driver implementation of encryption to allow
 563          * individual keys and passing plaintext EAPOL frames */
 564         if (hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOST_DECRYPT, 1) ||
 565             hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOST_ENCRYPT, 1)) {
 566                 printf("Could not setup host-based encryption in kernel "
 567                        "driver.\n");
 568                 return -1;
 569         }
 570
 571         return 0;
 572 }
 573
 574
 575 static int hostap_set_privacy(const char *ifname, void *priv, int enabled)
 576 {
 577         struct hostap_drvier_data *drv = priv;
 578
 579         return hostap_ioctl_prism2param(drv, PRISM2_PARAM_PRIVACY_INVOKED,
 580                                         enabled);
 581 }
 582
 583
 584 static int hostap_set_ssid(const char *ifname, void *priv, const u8 *buf,
 585                            int len)
 586 {
 587         struct hostap_driver_data *drv = priv;
 588         struct iwreq iwr;
 589
 590         memset(&iwr, 0, sizeof(iwr));
 591         strncpy(iwr.ifr_name, drv->iface, IFNAMSIZ);
 592         iwr.u.essid.flags = 1; /* SSID active */
 593         iwr.u.essid.pointer = (caddr_t) buf;
 594         iwr.u.essid.length = len + 1;
 595
 596         if (ioctl(drv->ioctl_sock, SIOCSIWESSID, &iwr) < 0) {
 597                 perror("ioctl[SIOCSIWESSID]");
 598                 printf("len=%d\n", len);
 599                 return -1;
 600         }
 601
 602         return 0;
 603 }
 604
 605
 606 static int hostap_flush(void *priv)
 607 {
 608         struct hostap_driver_data *drv = priv;
 609         struct prism2_hostapd_param param;
 610
 611         memset(&param, 0, sizeof(param));
 612         param.cmd = PRISM2_HOSTAPD_FLUSH;
 613         return hostapd_ioctl(drv, &param, sizeof(param));
 614 }
 615
 616
 617 static int hostap_read_sta_data(void *priv,
 618                                 struct hostap_sta_driver_data *data,
 619                                 const u8 *addr)
 620 {
 621         struct hostap_driver_data *drv = priv;
 622         char buf[1024], line[128], *pos;
 623         FILE *f;
 624         unsigned long val;
 625
 626         memset(data, 0, sizeof(*data));
 627         snprintf(buf, sizeof(buf), "/proc/net/hostap/%s/" MACSTR,
 628                  drv->iface, MAC2STR(addr));
 629
 630         f = fopen(buf, "r");
 631         if (!f)
 632                 return -1;
 633         /* Need to read proc file with in one piece, so use large enough
 634          * buffer. */
 635         setbuffer(f, buf, sizeof(buf));
 636
 637         while (fgets(line, sizeof(line), f)) {
 638                 pos = strchr(line, '=');
 639                 if (!pos)
 640                         continue;
 641                 *pos++ = '\0';
 642                 val = strtoul(pos, NULL, 10);
 643                 if (strcmp(line, "rx_packets") == 0)
 644                         data->rx_packets = val;
 645                 else if (strcmp(line, "tx_packets") == 0)
 646                         data->tx_packets = val;
 647                 else if (strcmp(line, "rx_bytes") == 0)
 648                         data->rx_bytes = val;
 649                 else if (strcmp(line, "tx_bytes") == 0)
 650                         data->tx_bytes = val;
 651         }
 652
 653         fclose(f);
 654
 655         return 0;
 656 }
 657
 658
 659 static int hostap_sta_add(const char *ifname, void *priv, const u8 *addr,
 660                           u16 aid, u16 capability, u8 *supp_rates,
 661                           size_t supp_rates_len, int flags)
 662 {
 663         struct hostap_driver_data *drv = priv;
 664         struct prism2_hostapd_param param;
 665         int tx_supp_rates = 0;
 666         size_t i;
 667
 668 #define WLAN_RATE_1M BIT(0)
 669 #define WLAN_RATE_2M BIT(1)
 670 #define WLAN_RATE_5M5 BIT(2)
 671 #define WLAN_RATE_11M BIT(3)
 672
 673         for (i = 0; i < supp_rates_len; i++) {
 674                 if ((supp_rates[i] & 0x7f) == 2)
 675                         tx_supp_rates |= WLAN_RATE_1M;
 676                 if ((supp_rates[i] & 0x7f) == 4)
 677                         tx_supp_rates |= WLAN_RATE_2M;
 678                 if ((supp_rates[i] & 0x7f) == 11)
 679                         tx_supp_rates |= WLAN_RATE_5M5;
 680                 if ((supp_rates[i] & 0x7f) == 22)
 681                         tx_supp_rates |= WLAN_RATE_11M;
 682         }
 683
 684         memset(&param, 0, sizeof(param));
 685         param.cmd = PRISM2_HOSTAPD_ADD_STA;
 686         memcpy(param.sta_addr, addr, ETH_ALEN);
 687         param.u.add_sta.aid = aid;
 688         param.u.add_sta.capability = capability;
 689         param.u.add_sta.tx_supp_rates = tx_supp_rates;
 690         return hostapd_ioctl(drv, &param, sizeof(param));
 691 }
 692
 693
 694 static int hostap_sta_remove(void *priv, const u8 *addr)
 695 {
 696         struct hostap_driver_data *drv = priv;
 697         struct prism2_hostapd_param param;
 698
 699         hostap_sta_set_flags(drv, addr, 0, ~WLAN_STA_AUTHORIZED);
 700
 701         memset(&param, 0, sizeof(param));
 702         param.cmd = PRISM2_HOSTAPD_REMOVE_STA;
 703         memcpy(param.sta_addr, addr, ETH_ALEN);
 704         if (hostapd_ioctl(drv, &param, sizeof(param))) {
 705                 printf("Could not remove station from kernel driver.\n");
 706                 return -1;
 707         }
 708         return 0;
 709 }
 710
 711
 712 static int hostap_get_inact_sec(void *priv, const u8 *addr)
 713 {
 714         struct hostap_driver_data *drv = priv;
 715         struct prism2_hostapd_param param;
 716
 717         memset(&param, 0, sizeof(param));
 718         param.cmd = PRISM2_HOSTAPD_GET_INFO_STA;
 719         memcpy(param.sta_addr, addr, ETH_ALEN);
 720         if (hostapd_ioctl(drv, &param, sizeof(param))) {
 721                 return -1;
 722         }
 723
 724         return param.u.get_info_sta.inactive_sec;
 725 }
 726
 727
 728 static int hostap_sta_clear_stats(void *priv, const u8 *addr)
 729 {
 730         struct hostap_driver_data *drv = priv;
 731         struct prism2_hostapd_param param;
 732
 733         memset(&param, 0, sizeof(param));
 734         param.cmd = PRISM2_HOSTAPD_STA_CLEAR_STATS;
 735         memcpy(param.sta_addr, addr, ETH_ALEN);
 736         if (hostapd_ioctl(drv, &param, sizeof(param))) {
 737                 return -1;
 738         }
 739
 740         return 0;
 741 }
 742
 743
 744 static int hostap_set_assoc_ap(void *priv, const u8 *addr)
 745 {
 746         struct hostap_driver_data *drv = priv;
 747         struct prism2_hostapd_param param;
 748
 749         memset(&param, 0, sizeof(param));
 750         param.cmd = PRISM2_HOSTAPD_SET_ASSOC_AP_ADDR;
 751         memcpy(param.sta_addr, addr, ETH_ALEN);
 752         if (hostapd_ioctl(drv, &param, sizeof(param)))
 753                 return -1;
 754
 755         return 0;
 756 }
 757
 758
 759 static int hostap_set_generic_elem(const char *ifname, void *priv,
 760                                    const u8 *elem, size_t elem_len)
 761 {
 762         struct hostap_driver_data *drv = priv;
 763         struct prism2_hostapd_param *param;
 764         int res;
 765         size_t blen = PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN + elem_len;
 766         if (blen < sizeof(*param))
 767                 blen = sizeof(*param);
 768
 769         param = wpa_zalloc(blen);
 770         if (param == NULL)
 771                 return -1;
 772
 773         param->cmd = PRISM2_HOSTAPD_SET_GENERIC_ELEMENT;
 774         param->u.generic_elem.len = elem_len;
 775         memcpy(param->u.generic_elem.data, elem, elem_len);
 776         res = hostapd_ioctl(drv, param, blen);
 777
 778         free(param);
 779
 780         return res;
 781 }
 782
 783
 784 static void
 785 hostapd_wireless_event_wireless_custom(struct hostap_driver_data *drv,
 786                                        char *custom)
 787 {
 788         struct hostapd_data *hapd = drv->hapd;
 789
 790         HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Custom wireless event: '%s'\n",
 791                       custom);
 792
 793         if (strncmp(custom, "MLME-MICHAELMICFAILURE.indication", 33) == 0) {
 794                 char *pos;
 795                 u8 addr[ETH_ALEN];
 796                 pos = strstr(custom, "addr=");
 797                 if (pos == NULL) {
 798                         HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
 799                                       "MLME-MICHAELMICFAILURE.indication "
 800                                       "without sender address ignored\n");
 801                         return;
 802                 }
 803                 pos += 5;
 804                 if (hwaddr_aton(pos, addr) == 0) {
 805                         ieee80211_michael_mic_failure(drv->hapd, addr, 1);
 806                 } else {
 807                         HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
 808                                       "MLME-MICHAELMICFAILURE.indication "
 809                                       "with invalid MAC address");
 810                 }
 811         }
 812 }
 813
 814
 815 static void hostapd_wireless_event_wireless(struct hostap_driver_data *drv,
 816                                             char *data, int len)
 817 {
 818         struct hostapd_data *hapd = drv->hapd;
 819         struct iw_event iwe_buf, *iwe = &iwe_buf;
 820         char *pos, *end, *custom, *buf;
 821
 822         pos = data;
 823         end = data + len;
 824
 825         while (pos + IW_EV_LCP_LEN <= end) {
 826                 /* Event data may be unaligned, so make a local, aligned copy
 827                  * before processing. */
 828                 memcpy(&iwe_buf, pos, IW_EV_LCP_LEN);
 829                 HOSTAPD_DEBUG(HOSTAPD_DEBUG_VERBOSE, "Wireless event: "
 830                               "cmd=0x%x len=%d\n", iwe->cmd, iwe->len);
 831                 if (iwe->len <= IW_EV_LCP_LEN)
 832                         return;
 833
 834                 custom = pos + IW_EV_POINT_LEN;
 835                 if (drv->we_version > 18 &&
 836                     (iwe->cmd == IWEVMICHAELMICFAILURE ||
 837                      iwe->cmd == IWEVCUSTOM)) {
 838                         /* WE-19 removed the pointer from struct iw_point */
 839                         char *dpos = (char *) &iwe_buf.u.data.length;
 840                         int dlen = dpos - (char *) &iwe_buf;
 841                         memcpy(dpos, pos + IW_EV_LCP_LEN,
 842                                sizeof(struct iw_event) - dlen);
 843                 } else {
 844                         memcpy(&iwe_buf, pos, sizeof(struct iw_event));
 845                         custom += IW_EV_POINT_OFF;
 846                 }
 847
 848                 switch (iwe->cmd) {
 849                 case IWEVCUSTOM:
 850                         if (custom + iwe->u.data.length > end)
 851                                 return;
 852                         buf = malloc(iwe->u.data.length + 1);
 853                         if (buf == NULL)
 854                                 return;
 855                         memcpy(buf, custom, iwe->u.data.length);
 856                         buf[iwe->u.data.length] = '\0';
 857                         hostapd_wireless_event_wireless_custom(drv, buf);
 858                         free(buf);
 859                         break;
 860                 }
 861
 862                 pos += iwe->len;
 863         }
 864 }
 865
 866
 867 static void hostapd_wireless_event_rtm_newlink(struct hostap_driver_data *drv,
 868                                                struct nlmsghdr *h, int len)
 869 {
 870         struct ifinfomsg *ifi;
 871         int attrlen, nlmsg_len, rta_len;
 872         struct rtattr * attr;
 873
 874         if (len < (int) sizeof(*ifi))
 875                 return;
 876
 877         ifi = NLMSG_DATA(h);
 878
 879         /* TODO: use ifi->ifi_index to filter out wireless events from other
 880          * interfaces */
 881
 882         nlmsg_len = NLMSG_ALIGN(sizeof(struct ifinfomsg));
 883
 884         attrlen = h->nlmsg_len - nlmsg_len;
 885         if (attrlen < 0)
 886                 return;
 887
 888         attr = (struct rtattr *) (((char *) ifi) + nlmsg_len);
 889
 890         rta_len = RTA_ALIGN(sizeof(struct rtattr));
 891         while (RTA_OK(attr, attrlen)) {
 892                 if (attr->rta_type == IFLA_WIRELESS) {
 893                         hostapd_wireless_event_wireless(
 894                                 drv, ((char *) attr) + rta_len,
 895                                 attr->rta_len - rta_len);
 896                 }
 897                 attr = RTA_NEXT(attr, attrlen);
 898         }
 899 }
 900
 901
 902 static void hostapd_wireless_event_receive(int sock, void *eloop_ctx,
 903                                            void *sock_ctx)
 904 {
 905         char buf[256];
 906         int left;
 907         struct sockaddr_nl from;
 908         socklen_t fromlen;
 909         struct nlmsghdr *h;
 910         struct hostap_driver_data *drv = eloop_ctx;
 911
 912         fromlen = sizeof(from);
 913         left = recvfrom(sock, buf, sizeof(buf), MSG_DONTWAIT,
 914                         (struct sockaddr *) &from, &fromlen);
 915         if (left < 0) {
 916                 if (errno != EINTR && errno != EAGAIN)
 917                         perror("recvfrom(netlink)");
 918                 return;
 919         }
 920
 921         h = (struct nlmsghdr *) buf;
 922         while (left >= (int) sizeof(*h)) {
 923                 int len, plen;
 924
 925                 len = h->nlmsg_len;
 926                 plen = len - sizeof(*h);
 927                 if (len > left || plen < 0) {
 928                         printf("Malformed netlink message: "
 929                                "len=%d left=%d plen=%d\n",
 930                                len, left, plen);
 931                         break;
 932                 }
 933
 934                 switch (h->nlmsg_type) {
 935                 case RTM_NEWLINK:
 936                         hostapd_wireless_event_rtm_newlink(drv, h, plen);
 937                         break;
 938                 }
 939
 940                 len = NLMSG_ALIGN(len);
 941                 left -= len;
 942                 h = (struct nlmsghdr *) ((char *) h + len);
 943         }
 944
 945         if (left > 0) {
 946                 printf("%d extra bytes in the end of netlink message\n", left);
 947         }
 948 }
 949
 950
 951 static int hostap_get_we_version(struct hostap_driver_data *drv)
 952 {
 953         struct iw_range *range;
 954         struct iwreq iwr;
 955         int minlen;
 956         size_t buflen;
 957
 958         drv->we_version = 0;
 959
 960         /*
 961          * Use larger buffer than struct iw_range in order to allow the
 962          * structure to grow in the future.
 963          */
 964         buflen = sizeof(struct iw_range) + 500;
 965         range = wpa_zalloc(buflen);
 966         if (range == NULL)
 967                 return -1;
 968
 969         memset(&iwr, 0, sizeof(iwr));
 970         strncpy(iwr.ifr_name, drv->iface, IFNAMSIZ);
 971         iwr.u.data.pointer = (caddr_t) range;
 972         iwr.u.data.length = buflen;
 973
 974         minlen = ((char *) &range->enc_capa) - (char *) range +
 975                 sizeof(range->enc_capa);
 976
 977         if (ioctl(drv->ioctl_sock, SIOCGIWRANGE, &iwr) < 0) {
 978                 perror("ioctl[SIOCGIWRANGE]");
 979                 free(range);
 980                 return -1;
 981         } else if (iwr.u.data.length >= minlen &&
 982                    range->we_version_compiled >= 18) {
 983                 wpa_printf(MSG_DEBUG, "SIOCGIWRANGE: WE(compiled)=%d "
 984                            "WE(source)=%d enc_capa=0x%x",
 985                            range->we_version_compiled,
 986                            range->we_version_source,
 987                            range->enc_capa);
 988                 drv->we_version = range->we_version_compiled;
 989         }
 990
 991         free(range);
 992         return 0;
 993 }
 994
 995
 996 static int hostap_wireless_event_init(void *priv)
 997 {
 998         struct hostap_driver_data *drv = priv;
 999         int s;
1000         struct sockaddr_nl local;
1001
1002         hostap_get_we_version(drv);
1003
1004         drv->wext_sock = -1;
1005
1006         s = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
1007         if (s < 0) {
1008                 perror("socket(PF_NETLINK,SOCK_RAW,NETLINK_ROUTE)");
1009                 return -1;
1010         }
1011
1012         memset(&local, 0, sizeof(local));
1013         local.nl_family = AF_NETLINK;
1014         local.nl_groups = RTMGRP_LINK;
1015         if (bind(s, (struct sockaddr *) &local, sizeof(local)) < 0) {
1016                 perror("bind(netlink)");
1017                 close(s);
1018                 return -1;
1019         }
1020
1021         eloop_register_read_sock(s, hostapd_wireless_event_receive, drv,
1022                                  NULL);
1023         drv->wext_sock = s;
1024
1025         return 0;
1026 }
1027
1028
1029 static void hostap_wireless_event_deinit(void *priv)
1030 {
1031         struct hostap_driver_data *drv = priv;
1032         if (drv->wext_sock < 0)
1033                 return;
1034         eloop_unregister_read_sock(drv->wext_sock);
1035         close(drv->wext_sock);
1036 }
1037
1038
1039 static int hostap_init(struct hostapd_data *hapd)
1040 {
1041         struct hostap_driver_data *drv;
1042
1043         drv = wpa_zalloc(sizeof(struct hostap_driver_data));
1044         if (drv == NULL) {
1045                 printf("Could not allocate memory for hostapd driver data\n");
1046                 return -1;
1047         }
1048
1049         drv->ops = hostap_driver_ops;
1050         drv->hapd = hapd;
1051         drv->ioctl_sock = drv->sock = -1;
1052         memcpy(drv->iface, hapd->conf->iface, sizeof(drv->iface));
1053
1054         drv->ioctl_sock = socket(PF_INET, SOCK_DGRAM, 0);
1055         if (drv->ioctl_sock < 0) {
1056                 perror("socket[PF_INET,SOCK_DGRAM]");
1057                 free(drv);
1058                 return -1;
1059         }
1060
1061         if (hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOSTAPD, 1)) {
1062                 printf("Could not enable hostapd mode for interface %s\n",
1063                        drv->iface);
1064                 close(drv->ioctl_sock);
1065                 free(drv);
1066                 return -1;
1067         }
1068
1069         if (hapd->conf->assoc_ap &&
1070             hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOSTAPD_STA, 1)) {
1071                 printf("Could not enable hostapd STA mode for interface %s\n",
1072                        drv->iface);
1073                 close(drv->ioctl_sock);
1074                 free(drv);
1075                 return -1;
1076         }
1077
1078         if (hostap_init_sockets(drv)) {
1079                 close(drv->ioctl_sock);
1080                 free(drv);
1081                 return -1;
1082         }
1083
1084         hapd->driver = &drv->ops;
1085         return 0;
1086 }
1087
1088
1089 static void hostap_driver_deinit(void *priv)
1090 {
1091         struct hostap_driver_data *drv = priv;
1092
1093         drv->hapd->driver = NULL;
1094
1095         (void) hostap_set_iface_flags(drv, 0);
1096         (void) hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOSTAPD, 0);
1097         (void) hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOSTAPD_STA, 0);
1098
1099         if (drv->ioctl_sock >= 0)
1100                 close(drv->ioctl_sock);
1101
1102         if (drv->sock >= 0)
1103                 close(drv->sock);
1104
1105         free(drv);
1106 }
1107
1108
1109 static int hostap_sta_deauth(void *priv, const u8 *addr, int reason)
1110 {
1111         struct hostap_driver_data *drv = priv;
1112         struct ieee80211_mgmt mgmt;
1113
1114         memset(&mgmt, 0, sizeof(mgmt));
1115         mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
1116                                           WLAN_FC_STYPE_DEAUTH);
1117         memcpy(mgmt.da, addr, ETH_ALEN);
1118         memcpy(mgmt.sa, drv->hapd->own_addr, ETH_ALEN);
1119         memcpy(mgmt.bssid, drv->hapd->own_addr, ETH_ALEN);
1120         mgmt.u.deauth.reason_code = host_to_le16(reason);
1121         return hostap_send_mgmt_frame(drv, &mgmt, IEEE80211_HDRLEN +
1122                                       sizeof(mgmt.u.deauth), 0);
1123 }
1124
1125
1126 static int hostap_sta_disassoc(void *priv, const u8 *addr, int reason)
1127 {
1128         struct hostap_driver_data *drv = priv;
1129         struct ieee80211_mgmt mgmt;
1130
1131         memset(&mgmt, 0, sizeof(mgmt));
1132         mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
1133                                           WLAN_FC_STYPE_DISASSOC);
1134         memcpy(mgmt.da, addr, ETH_ALEN);
1135         memcpy(mgmt.sa, drv->hapd->own_addr, ETH_ALEN);
1136         memcpy(mgmt.bssid, drv->hapd->own_addr, ETH_ALEN);
1137         mgmt.u.disassoc.reason_code = host_to_le16(reason);
1138         return  hostap_send_mgmt_frame(drv, &mgmt, IEEE80211_HDRLEN +
1139                                        sizeof(mgmt.u.disassoc), 0);
1140 }
1141
1142
1143 static struct hostapd_hw_modes * hostap_get_hw_feature_data(void *priv,
1144                                                             u16 *num_modes,
1145                                                             u16 *flags)
1146 {
1147         struct hostapd_hw_modes *mode;
1148         int i, clen, rlen;
1149         const short chan2freq[14] = {
1150                 2412, 2417, 2422, 2427, 2432, 2437, 2442,
1151                 2447, 2452, 2457, 2462, 2467, 2472, 2484
1152         };
1153
1154         mode = wpa_zalloc(sizeof(struct hostapd_hw_modes));
1155         if (mode == NULL)
1156                 return NULL;
1157
1158         *num_modes = 1;
1159         *flags = 0;
1160
1161         mode->mode = HOSTAPD_MODE_IEEE80211B;
1162         mode->num_channels = 14;
1163         mode->num_rates = 4;
1164
1165         clen = mode->num_channels * sizeof(struct hostapd_channel_data);
1166         rlen = mode->num_rates * sizeof(struct hostapd_rate_data);
1167
1168         mode->channels = wpa_zalloc(clen);
1169         mode->rates = wpa_zalloc(rlen);
1170         if (mode->channels == NULL || mode->rates == NULL) {
1171                 hostapd_free_hw_features(mode, *num_modes);
1172                 return NULL;
1173         }
1174
1175         for (i = 0; i < 14; i++) {
1176                 mode->channels[i].chan = i + 1;
1177                 mode->channels[i].freq = chan2freq[i];
1178         }
1179
1180         mode->rates[0].rate = 10;
1181         mode->rates[0].flags = HOSTAPD_RATE_CCK;
1182         mode->rates[1].rate = 20;
1183         mode->rates[1].flags = HOSTAPD_RATE_CCK;
1184         mode->rates[2].rate = 55;
1185         mode->rates[2].flags = HOSTAPD_RATE_CCK;
1186         mode->rates[3].rate = 110;
1187         mode->rates[3].flags = HOSTAPD_RATE_CCK;
1188
1189         return mode;
1190 }
1191
1192
1193 static const struct driver_ops hostap_driver_ops = {
1194         .name = "hostap",
1195         .init = hostap_init,
1196         .deinit = hostap_driver_deinit,
1197         .wireless_event_init = hostap_wireless_event_init,
1198         .wireless_event_deinit = hostap_wireless_event_deinit,
1199         .set_ieee8021x = hostap_set_ieee8021x,
1200         .set_privacy = hostap_set_privacy,
1201         .set_encryption = hostap_set_encryption,
1202         .get_seqnum = hostap_get_seqnum,
1203         .flush = hostap_flush,
1204         .set_generic_elem = hostap_set_generic_elem,
1205         .read_sta_data = hostap_read_sta_data,
1206         .send_eapol = hostap_send_eapol,
1207         .sta_set_flags = hostap_sta_set_flags,
1208         .sta_deauth = hostap_sta_deauth,
1209         .sta_disassoc = hostap_sta_disassoc,
1210         .sta_remove = hostap_sta_remove,
1211         .set_ssid = hostap_set_ssid,
1212         .send_mgmt_frame = hostap_send_mgmt_frame,
1213         .set_assoc_ap = hostap_set_assoc_ap,
1214         .sta_add = hostap_sta_add,
1215         .get_inact_sec = hostap_get_inact_sec,
1216         .sta_clear_stats = hostap_sta_clear_stats,
1217         .get_hw_feature_data = hostap_get_hw_feature_data,
1218 };
1219
1220
1221 void hostap_driver_register(void)
1222 {
1223         driver_register(hostap_driver_ops.name, &hostap_driver_ops);
1224 }