usr.sbin/wpa/wpa_supplicant/driver_freebsd.c

   1 /*
   2  * WPA Supplicant - driver interaction with BSD net80211 layer
   3  * Copyright (c) 2004, Sam Leffler <sam@errno.com>
   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  * $FreeBSD$
  15  */
  16
  17 #include <stdlib.h>
  18 #include <stdio.h>
  19 #include <unistd.h>
  20 #include <string.h>
  21 #include <sys/ioctl.h>
  22 #include <errno.h>
  23
  24 #include "common.h"
  25 #include "driver.h"
  26 #include "eloop.h"
  27 #include "wpa_supplicant.h"
  28 #include "l2_packet.h"
  29 #include "wpa.h"                        /* XXX for RSN_INFO_ELEM */
  30
  31 #include <sys/socket.h>
  32 #include <net/if.h>
  33 #include <net/ethernet.h>
  34
  35 #include <net80211/ieee80211.h>
  36 #include <net80211/ieee80211_crypto.h>
  37 #include <net80211/ieee80211_ioctl.h>
  38
  39 struct wpa_driver_bsd_data {
  40         int     sock;                   /* open socket for 802.11 ioctls */
  41         int     route;                  /* routing socket for events */
  42         char    ifname[IFNAMSIZ+1];     /* interface name */
  43         unsigned int ifindex;           /* interface index */
  44         void    *ctx;
  45         int     prev_roaming;           /* roaming state to restore on deinit */
  46         int     prev_privacy;           /* privacy state to restore on deinit */
  47         int     prev_wpa;               /* wpa state to restore on deinit */
  48 };
  49
  50 static int
  51 set80211var(struct wpa_driver_bsd_data *drv, int op, const void *arg, int arg_len)
  52 {
  53         struct ieee80211req ireq;
  54
  55         memset(&ireq, 0, sizeof(ireq));
  56         strncpy(ireq.i_name, drv->ifname, IFNAMSIZ);
  57         ireq.i_type = op;
  58         ireq.i_len = arg_len;
  59         ireq.i_data = (void *) arg;
  60
  61         if (ioctl(drv->sock, SIOCS80211, &ireq) < 0) {
  62                 fprintf(stderr, "ioctl[SIOCS80211, op %u, len %u]: %s\n",
  63                         op, arg_len, strerror(errno));
  64                 return -1;
  65         }
  66         return 0;
  67 }
  68
  69 static int
  70 get80211var(struct wpa_driver_bsd_data *drv, int op, void *arg, int arg_len)
  71 {
  72         struct ieee80211req ireq;
  73
  74         memset(&ireq, 0, sizeof(ireq));
  75         strncpy(ireq.i_name, drv->ifname, IFNAMSIZ);
  76         ireq.i_type = op;
  77         ireq.i_len = arg_len;
  78         ireq.i_data = arg;
  79
  80         if (ioctl(drv->sock, SIOCG80211, &ireq) < 0) {
  81                 fprintf(stderr, "ioctl[SIOCG80211, op %u, len %u]: %s\n",
  82                         op, arg_len, strerror(errno));
  83                 return -1;
  84         }
  85         return ireq.i_len;
  86 }
  87
  88 static int
  89 set80211param(struct wpa_driver_bsd_data *drv, int op, int arg)
  90 {
  91         struct ieee80211req ireq;
  92
  93         memset(&ireq, 0, sizeof(ireq));
  94         strncpy(ireq.i_name, drv->ifname, IFNAMSIZ);
  95         ireq.i_type = op;
  96         ireq.i_val = arg;
  97
  98         if (ioctl(drv->sock, SIOCS80211, &ireq) < 0) {
  99                 fprintf(stderr, "ioctl[SIOCS80211, op %u, arg 0x%x]: %s\n",
 100                         op, arg, strerror(errno));
 101                 return -1;
 102         }
 103         return 0;
 104 }
 105
 106 static int
 107 get80211param(struct wpa_driver_bsd_data *drv, int op)
 108 {
 109         struct ieee80211req ireq;
 110
 111         memset(&ireq, 0, sizeof(ireq));
 112         strncpy(ireq.i_name, drv->ifname, IFNAMSIZ);
 113         ireq.i_type = op;
 114
 115         if (ioctl(drv->sock, SIOCG80211, &ireq) < 0) {
 116                 fprintf(stderr, "ioctl[SIOCG80211, op %u]: %s\n",
 117                         op, strerror(errno));
 118                 return -1;
 119         }
 120         return ireq.i_val;
 121 }
 122
 123 static int
 124 getifflags(struct wpa_driver_bsd_data *drv, int *flags)
 125 {
 126         struct ifreq ifr;
 127
 128         memset(&ifr, 0, sizeof(ifr));
 129         strncpy(ifr.ifr_name, drv->ifname, sizeof (ifr.ifr_name));
 130         if (ioctl(drv->sock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
 131                 perror("SIOCGIFFLAGS");
 132                 return errno;
 133         }
 134         *flags = ifr.ifr_flags & 0xffff;
 135         return 0;
 136 }
 137
 138 static int
 139 setifflags(struct wpa_driver_bsd_data *drv, int flags)
 140 {
 141         struct ifreq ifr;
 142
 143         memset(&ifr, 0, sizeof(ifr));
 144         strncpy(ifr.ifr_name, drv->ifname, sizeof (ifr.ifr_name));
 145         ifr.ifr_flags = flags & 0xffff;
 146         if (ioctl(drv->sock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) {
 147                 perror("SIOCSIFFLAGS");
 148                 return errno;
 149         }
 150         return 0;
 151 }
 152
 153 static int
 154 wpa_driver_bsd_get_bssid(void *priv, u8 *bssid)
 155 {
 156         struct wpa_driver_bsd_data *drv = priv;
 157
 158         return get80211var(drv, IEEE80211_IOC_BSSID,
 159                 bssid, IEEE80211_ADDR_LEN) < 0 ? -1 : 0;
 160 }
 161
 162 #if 0
 163 static int
 164 wpa_driver_bsd_set_bssid(void *priv, const char *bssid)
 165 {
 166         struct wpa_driver_bsd_data *drv = priv;
 167
 168         return set80211var(drv, IEEE80211_IOC_BSSID,
 169                 bssid, IEEE80211_ADDR_LEN);
 170 }
 171 #endif
 172
 173 static int
 174 wpa_driver_bsd_get_ssid(void *priv, u8 *ssid)
 175 {
 176         struct wpa_driver_bsd_data *drv = priv;
 177
 178         return get80211var(drv, IEEE80211_IOC_SSID,
 179                 ssid, IEEE80211_NWID_LEN);
 180 }
 181
 182 static int
 183 wpa_driver_bsd_set_ssid(void *priv, const char *ssid,
 184                              size_t ssid_len)
 185 {
 186         struct wpa_driver_bsd_data *drv = priv;
 187
 188         return set80211var(drv, IEEE80211_IOC_SSID, ssid, ssid_len);
 189 }
 190
 191 static int
 192 wpa_driver_bsd_set_wpa_ie(struct wpa_driver_bsd_data *drv,
 193         const char *wpa_ie, size_t wpa_ie_len)
 194 {
 195         return set80211var(drv, IEEE80211_IOC_OPTIE, wpa_ie, wpa_ie_len);
 196 }
 197
 198 static int
 199 wpa_driver_bsd_set_wpa_internal(void *priv, int wpa, int privacy)
 200 {
 201         struct wpa_driver_bsd_data *drv = priv;
 202         int ret = 0;
 203
 204         wpa_printf(MSG_DEBUG, "%s: wpa=%d privacy=%d",
 205                 __FUNCTION__, wpa, privacy);
 206
 207         if (!wpa && wpa_driver_bsd_set_wpa_ie(drv, NULL, 0) < 0)
 208                 ret = -1;
 209         if (set80211param(drv, IEEE80211_IOC_PRIVACY, privacy) < 0)
 210                 ret = -1;
 211         if (set80211param(drv, IEEE80211_IOC_WPA, wpa) < 0)
 212                 ret = -1;
 213
 214         return ret;
 215 }
 216
 217 static int
 218 wpa_driver_bsd_set_wpa(void *priv, int enabled)
 219 {
 220         wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
 221
 222         return wpa_driver_bsd_set_wpa_internal(priv, enabled ? 3 : 0, enabled);
 223 }
 224
 225 static int
 226 wpa_driver_bsd_del_key(struct wpa_driver_bsd_data *drv, int key_idx,
 227                        const unsigned char *addr)
 228 {
 229         struct ieee80211req_del_key wk;
 230
 231         memset(&wk, 0, sizeof(wk));
 232         if (addr != NULL &&
 233             bcmp(addr, "\xff\xff\xff\xff\xff\xff", IEEE80211_ADDR_LEN) != 0) {
 234                 struct ether_addr ea;
 235
 236                 memcpy(&ea, addr, IEEE80211_ADDR_LEN);
 237                 wpa_printf(MSG_DEBUG, "%s: addr=%s keyidx=%d",
 238                         __func__, ether_ntoa(&ea), key_idx);
 239                 memcpy(wk.idk_macaddr, addr, IEEE80211_ADDR_LEN);
 240                 wk.idk_keyix = (uint8_t) IEEE80211_KEYIX_NONE;
 241         } else {
 242                 wpa_printf(MSG_DEBUG, "%s: keyidx=%d", __func__, key_idx);
 243                 wk.idk_keyix = key_idx;
 244         }
 245         return set80211var(drv, IEEE80211_IOC_DELKEY, &wk, sizeof(wk));
 246 }
 247
 248 static int
 249 wpa_driver_bsd_set_key(void *priv, wpa_alg alg,
 250                        const unsigned char *addr, int key_idx, int set_tx,
 251                        const u8 *seq, size_t seq_len,
 252                        const u8 *key, size_t key_len)
 253 {
 254         struct wpa_driver_bsd_data *drv = priv;
 255         struct ieee80211req_key wk;
 256         struct ether_addr ea;
 257         char *alg_name;
 258         u_int8_t cipher;
 259
 260         if (alg == WPA_ALG_NONE)
 261                 return wpa_driver_bsd_del_key(drv, key_idx, addr);
 262
 263         switch (alg) {
 264         case WPA_ALG_WEP:
 265                 alg_name = "WEP";
 266                 cipher = IEEE80211_CIPHER_WEP;
 267                 break;
 268         case WPA_ALG_TKIP:
 269                 alg_name = "TKIP";
 270                 cipher = IEEE80211_CIPHER_TKIP;
 271                 break;
 272         case WPA_ALG_CCMP:
 273                 alg_name = "CCMP";
 274                 cipher = IEEE80211_CIPHER_AES_CCM;
 275                 break;
 276         default:
 277                 wpa_printf(MSG_DEBUG, "%s: unknown/unsupported algorithm %d",
 278                         __func__, alg);
 279                 return -1;
 280         }
 281
 282         memcpy(&ea, addr, IEEE80211_ADDR_LEN);
 283         wpa_printf(MSG_DEBUG,
 284                 "%s: alg=%s addr=%s key_idx=%d set_tx=%d seq_len=%zu key_len=%zu",
 285                 __func__, alg_name, ether_ntoa(&ea), key_idx, set_tx,
 286                 seq_len, key_len);
 287
 288         if (seq_len > sizeof(u_int64_t)) {
 289                 wpa_printf(MSG_DEBUG, "%s: seq_len %zu too big",
 290                         __func__, seq_len);
 291                 return -2;
 292         }
 293         if (key_len > sizeof(wk.ik_keydata)) {
 294                 wpa_printf(MSG_DEBUG, "%s: key length %zu too big",
 295                         __func__, key_len);
 296                 return -3;
 297         }
 298
 299         memset(&wk, 0, sizeof(wk));
 300         wk.ik_type = cipher;
 301         wk.ik_flags = IEEE80211_KEY_RECV;
 302         if (set_tx)
 303                 wk.ik_flags |= IEEE80211_KEY_XMIT;
 304         memcpy(wk.ik_macaddr, addr, IEEE80211_ADDR_LEN);
 305         /*
 306          * Deduce whether group/global or unicast key by checking
 307          * the address (yech).  Note also that we can only mark global
 308          * keys default; doing this for a unicast key is an error.
 309          */
 310         if (bcmp(addr, "\xff\xff\xff\xff\xff\xff", IEEE80211_ADDR_LEN) == 0) {
 311                 wk.ik_flags |= IEEE80211_KEY_GROUP;
 312                 wk.ik_keyix = key_idx;
 313         } else {
 314                 wk.ik_keyix = (key_idx == 0 ? IEEE80211_KEYIX_NONE : key_idx);
 315         }
 316         if (wk.ik_keyix != IEEE80211_KEYIX_NONE && set_tx)
 317                 wk.ik_flags |= IEEE80211_KEY_DEFAULT;
 318         wk.ik_keylen = key_len;
 319         memcpy(&wk.ik_keyrsc, seq, seq_len);
 320         memcpy(wk.ik_keydata, key, key_len);
 321
 322         return set80211var(drv, IEEE80211_IOC_WPAKEY, &wk, sizeof(wk));
 323 }
 324
 325 static int
 326 wpa_driver_bsd_set_countermeasures(void *priv, int enabled)
 327 {
 328         struct wpa_driver_bsd_data *drv = priv;
 329
 330         wpa_printf(MSG_DEBUG, "%s: enabled=%d", __func__, enabled);
 331         return set80211param(drv, IEEE80211_IOC_COUNTERMEASURES, enabled);
 332 }
 333
 334
 335 static int
 336 wpa_driver_bsd_set_drop_unencrypted(void *priv, int enabled)
 337 {
 338         struct wpa_driver_bsd_data *drv = priv;
 339
 340         wpa_printf(MSG_DEBUG, "%s: enabled=%d", __func__, enabled);
 341         return set80211param(drv, IEEE80211_IOC_DROPUNENCRYPTED, enabled);
 342 }
 343
 344 static int
 345 wpa_driver_bsd_deauthenticate(void *priv, const u8 *addr, int reason_code)
 346 {
 347         struct wpa_driver_bsd_data *drv = priv;
 348         struct ieee80211req_mlme mlme;
 349
 350         wpa_printf(MSG_DEBUG, "%s", __func__);
 351         memset(&mlme, 0, sizeof(mlme));
 352         mlme.im_op = IEEE80211_MLME_DEAUTH;
 353         mlme.im_reason = reason_code;
 354         memcpy(mlme.im_macaddr, addr, IEEE80211_ADDR_LEN);
 355         return set80211var(drv, IEEE80211_IOC_MLME, &mlme, sizeof(mlme));
 356 }
 357
 358 static int
 359 wpa_driver_bsd_disassociate(void *priv, const u8 *addr, int reason_code)
 360 {
 361         struct wpa_driver_bsd_data *drv = priv;
 362         struct ieee80211req_mlme mlme;
 363
 364         wpa_printf(MSG_DEBUG, "%s", __func__);
 365         memset(&mlme, 0, sizeof(mlme));
 366         mlme.im_op = IEEE80211_MLME_DISASSOC;
 367         mlme.im_reason = reason_code;
 368         memcpy(mlme.im_macaddr, addr, IEEE80211_ADDR_LEN);
 369         return set80211var(drv, IEEE80211_IOC_MLME, &mlme, sizeof(mlme));
 370 }
 371
 372 static int
 373 wpa_driver_bsd_associate(void *priv, struct wpa_driver_associate_params *params)
 374 {
 375         struct wpa_driver_bsd_data *drv = priv;
 376         struct ieee80211req_mlme mlme;
 377         int privacy;
 378
 379         wpa_printf(MSG_DEBUG,
 380                 "%s: ssid '%.*s' wpa ie len %u pairwise %u group %u key mgmt %u"
 381                 , __func__
 382                 , params->ssid_len, params->ssid
 383                 , params->wpa_ie_len
 384                 , params->pairwise_suite
 385                 , params->group_suite
 386                 , params->key_mgmt_suite
 387         );
 388
 389         /* XXX error handling is wrong but unclear what to do... */
 390         if (wpa_driver_bsd_set_wpa_ie(drv, params->wpa_ie, params->wpa_ie_len) < 0)
 391                 return -1;
 392
 393         privacy = !(params->pairwise_suite == CIPHER_NONE &&
 394             params->group_suite == CIPHER_NONE &&
 395             params->key_mgmt_suite == KEY_MGMT_NONE &&
 396             params->wpa_ie_len == 0);
 397         wpa_printf(MSG_DEBUG, "%s: set PRIVACY %u", __func__, privacy);
 398
 399         if (set80211param(drv, IEEE80211_IOC_PRIVACY, privacy) < 0)
 400                 return -1;
 401
 402         if (params->wpa_ie_len &&
 403             set80211param(drv, IEEE80211_IOC_WPA,
 404                           params->wpa_ie[0] == RSN_INFO_ELEM ? 2 : 1) < 0)
 405                 return -1;
 406
 407         memset(&mlme, 0, sizeof(mlme));
 408         mlme.im_op = IEEE80211_MLME_ASSOC;
 409         if (params->ssid != NULL)
 410                 memcpy(mlme.im_ssid, params->ssid, params->ssid_len);
 411         mlme.im_ssid_len = params->ssid_len;
 412         if (params->bssid != NULL)
 413                 memcpy(mlme.im_macaddr, params->bssid, IEEE80211_ADDR_LEN);
 414         if (set80211var(drv, IEEE80211_IOC_MLME, &mlme, sizeof(mlme)) < 0)
 415                 return -1;
 416         return 0;
 417 }
 418
 419 static int
 420 wpa_driver_bsd_set_auth_alg(void *priv, int auth_alg)
 421 {
 422         struct wpa_driver_bsd_data *drv = priv;
 423         int authmode;
 424
 425         if ((auth_alg & AUTH_ALG_OPEN_SYSTEM) &&
 426             (auth_alg & AUTH_ALG_SHARED_KEY))
 427                 authmode = IEEE80211_AUTH_AUTO;
 428         else if (auth_alg & AUTH_ALG_SHARED_KEY)
 429                 authmode = IEEE80211_AUTH_SHARED;
 430         else
 431                 authmode = IEEE80211_AUTH_OPEN;
 432
 433         wpa_printf(MSG_DEBUG, "%s alg 0x%x authmode %u",
 434                 __func__, auth_alg, authmode);
 435
 436         return set80211param(drv, IEEE80211_IOC_AUTHMODE, authmode);
 437 }
 438
 439 static int
 440 wpa_driver_bsd_scan(void *priv, const u8 *ssid, size_t ssid_len)
 441 {
 442         struct wpa_driver_bsd_data *drv = priv;
 443         int flags;
 444
 445         /* NB: interface must be marked UP to do a scan */
 446         if (getifflags(drv, &flags) != 0 || setifflags(drv, flags | IFF_UP) != 0)
 447                 return -1;
 448
 449         /* set desired ssid before scan */
 450         if (wpa_driver_bsd_set_ssid(drv, ssid, ssid_len) < 0)
 451                 return -1;
 452
 453         /* NB: net80211 delivers a scan complete event so no need to poll */
 454         return set80211param(drv, IEEE80211_IOC_SCAN_REQ, 0);
 455 }
 456
 457 #include <net/route.h>
 458 #include <net80211/ieee80211_freebsd.h>
 459
 460 static void
 461 wpa_driver_bsd_event_receive(int sock, void *ctx, void *sock_ctx)
 462 {
 463         struct wpa_driver_bsd_data *drv = sock_ctx;
 464         char buf[2048];
 465         struct if_announcemsghdr *ifan;
 466         struct if_msghdr *ifm;
 467         struct rt_msghdr *rtm;
 468         union wpa_event_data event;
 469         struct ieee80211_michael_event *mic;
 470         int n;
 471
 472         n = read(sock, buf, sizeof(buf));
 473         if (n < 0) {
 474                 if (errno != EINTR && errno != EAGAIN)
 475                         perror("read(PF_ROUTE)");
 476                 return;
 477         }
 478
 479         rtm = (struct rt_msghdr *) buf;
 480         if (rtm->rtm_version != RTM_VERSION) {
 481                 wpa_printf(MSG_DEBUG, "Routing message version %d not "
 482                         "understood\n", rtm->rtm_version);
 483                 return;
 484         }
 485         memset(&event, 0, sizeof(event));
 486         switch (rtm->rtm_type) {
 487         case RTM_IFANNOUNCE:
 488                 ifan = (struct if_announcemsghdr *) rtm;
 489                 if (ifan->ifan_index != drv->ifindex)
 490                         break;
 491                 strlcpy(event.interface_status.ifname, drv->ifname,
 492                         sizeof(event.interface_status.ifname));
 493                 switch (ifan->ifan_what) {
 494                 case IFAN_DEPARTURE:
 495                         event.interface_status.ievent = EVENT_INTERFACE_REMOVED;
 496                 default:
 497                         return;
 498                 }
 499                 wpa_printf(MSG_DEBUG, "RTM_IFANNOUNCE: Interface '%s' %s",
 500                            event.interface_status.ifname,
 501                            ifan->ifan_what == IFAN_DEPARTURE ?
 502                                 "removed" : "added");
 503                 wpa_supplicant_event(ctx, EVENT_INTERFACE_STATUS, &event);
 504                 break;
 505         case RTM_IEEE80211:
 506                 ifan = (struct if_announcemsghdr *) rtm;
 507                 if (ifan->ifan_index != drv->ifindex)
 508                         break;
 509                 switch (ifan->ifan_what) {
 510                 case RTM_IEEE80211_ASSOC:
 511                 case RTM_IEEE80211_REASSOC:
 512                         wpa_supplicant_event(ctx, EVENT_ASSOC, NULL);
 513                         break;
 514                 case RTM_IEEE80211_DISASSOC:
 515                         wpa_supplicant_event(ctx, EVENT_DISASSOC, NULL);
 516                         break;
 517                 case RTM_IEEE80211_SCAN:
 518                         wpa_supplicant_event(ctx, EVENT_SCAN_RESULTS, NULL);
 519                         break;
 520                 case RTM_IEEE80211_REPLAY:
 521                         /* ignore */
 522                         break;
 523                 case RTM_IEEE80211_MICHAEL:
 524                         mic = (struct ieee80211_michael_event *) &ifan[1];
 525                         wpa_printf(MSG_DEBUG,
 526                                 "Michael MIC failure wireless event: "
 527                                 "keyix=%u src_addr=" MACSTR, mic->iev_keyix,
 528                                 MAC2STR(mic->iev_src));
 529
 530                         memset(&event, 0, sizeof(event));
 531                         event.michael_mic_failure.unicast =
 532                                 !IEEE80211_IS_MULTICAST(mic->iev_dst);
 533                         wpa_supplicant_event(ctx, EVENT_MICHAEL_MIC_FAILURE,
 534                                 &event);
 535                         break;
 536                 }
 537                 break;
 538         case RTM_IFINFO:
 539                 ifm = (struct if_msghdr *) rtm;
 540                 if (ifm->ifm_index != drv->ifindex)
 541                         break;
 542                 if ((rtm->rtm_flags & RTF_UP) == 0) {
 543                         strlcpy(event.interface_status.ifname, drv->ifname,
 544                                 sizeof(event.interface_status.ifname));
 545                         event.interface_status.ievent = EVENT_INTERFACE_REMOVED;
 546                         wpa_printf(MSG_DEBUG, "RTM_IFINFO: Interface '%s' DOWN",
 547                                    event.interface_status.ifname);
 548                         wpa_supplicant_event(ctx, EVENT_INTERFACE_STATUS, &event);
 549                 }
 550                 break;
 551         }
 552 }
 553
 554 /* Compare function for sorting scan results. Return >0 if @b is consider
 555  * better. */
 556 static int
 557 wpa_scan_result_compar(const void *a, const void *b)
 558 {
 559         const struct wpa_scan_result *wa = a;
 560         const struct wpa_scan_result *wb = b;
 561
 562         /* WPA/WPA2 support preferred */
 563         if ((wb->wpa_ie_len || wb->rsn_ie_len) &&
 564             !(wa->wpa_ie_len || wa->rsn_ie_len))
 565                 return 1;
 566         if (!(wb->wpa_ie_len || wb->rsn_ie_len) &&
 567             (wa->wpa_ie_len || wa->rsn_ie_len))
 568                 return -1;
 569
 570         /* privacy support preferred */
 571         if ((wa->caps & IEEE80211_CAPINFO_PRIVACY) &&
 572             (wb->caps & IEEE80211_CAPINFO_PRIVACY) == 0)
 573                 return 1;
 574         if ((wa->caps & IEEE80211_CAPINFO_PRIVACY) == 0 &&
 575             (wb->caps & IEEE80211_CAPINFO_PRIVACY))
 576                 return -1;
 577
 578         /* best/max rate preferred if signal level close enough XXX */
 579         if (wa->maxrate != wb->maxrate && abs(wb->level - wa->level) < 5)
 580                 return wb->maxrate - wa->maxrate;
 581
 582         /* use freq for channel preference */
 583
 584         /* all things being equal, use signal level */
 585         return wb->level - wa->level;
 586 }
 587
 588 static int
 589 getmaxrate(uint8_t rates[15], uint8_t nrates)
 590 {
 591         int i, maxrate = -1;
 592
 593         for (i = 0; i < nrates; i++) {
 594                 int rate = rates[i] & IEEE80211_RATE_VAL;
 595                 if (rate > maxrate)
 596                         rate = maxrate;
 597         }
 598         return maxrate;
 599 }
 600
 601 /* unalligned little endian access */
 602 #define LE_READ_4(p)                                    \
 603         ((u_int32_t)                                    \
 604          ((((const u_int8_t *)(p))[0]      ) |          \
 605           (((const u_int8_t *)(p))[1] <<  8) |          \
 606           (((const u_int8_t *)(p))[2] << 16) |          \
 607           (((const u_int8_t *)(p))[3] << 24)))
 608
 609 static int __inline
 610 iswpaoui(const u_int8_t *frm)
 611 {
 612         return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI);
 613 }
 614
 615 static int
 616 wpa_driver_bsd_get_scan_results(void *priv,
 617                                      struct wpa_scan_result *results,
 618                                      size_t max_size)
 619 {
 620 #define min(a,b)        ((a)>(b)?(b):(a))
 621         struct wpa_driver_bsd_data *drv = priv;
 622         uint8_t buf[24*1024];
 623         uint8_t *cp, *vp;
 624         struct ieee80211req_scan_result *sr;
 625         struct wpa_scan_result *wsr;
 626         int len, ielen;
 627
 628         memset(results, 0, max_size * sizeof(struct wpa_scan_result));
 629
 630         len = get80211var(drv, IEEE80211_IOC_SCAN_RESULTS, buf, sizeof(buf));
 631         if (len < 0)
 632                 return -1;
 633         cp = buf;
 634         wsr = results;
 635         while (len >= sizeof(struct ieee80211req_scan_result)) {
 636                 sr = (struct ieee80211req_scan_result *) cp;
 637                 memcpy(wsr->bssid, sr->isr_bssid, IEEE80211_ADDR_LEN);
 638                 wsr->ssid_len = sr->isr_ssid_len;
 639                 wsr->freq = sr->isr_freq;
 640                 wsr->noise = sr->isr_noise;
 641                 wsr->qual = sr->isr_rssi;
 642                 wsr->level = 0;         /* XXX? */
 643                 wsr->caps = sr->isr_capinfo;
 644                 wsr->maxrate = getmaxrate(sr->isr_rates, sr->isr_nrates);
 645                 vp = (u_int8_t *)(sr+1);
 646                 memcpy(wsr->ssid, vp, sr->isr_ssid_len);
 647                 if (sr->isr_ie_len > 0) {
 648                         vp += sr->isr_ssid_len;
 649                         ielen = sr->isr_ie_len;
 650                         while (ielen > 0) {
 651                                 switch (vp[0]) {
 652                                 case IEEE80211_ELEMID_VENDOR:
 653                                         if (!iswpaoui(vp))
 654                                                 break;
 655                                         wsr->wpa_ie_len =
 656                                             min(2+vp[1], SSID_MAX_WPA_IE_LEN);
 657                                         memcpy(wsr->wpa_ie, vp, wsr->wpa_ie_len);
 658                                         break;
 659                                 case IEEE80211_ELEMID_RSN:
 660                                         wsr->rsn_ie_len =
 661                                             min(2+vp[1], SSID_MAX_WPA_IE_LEN);
 662                                         memcpy(wsr->rsn_ie, vp, wsr->rsn_ie_len);
 663                                         break;
 664                                 }
 665                                 ielen -= 2+vp[1];
 666                                 vp += 2+vp[1];
 667                         }
 668                 }
 669
 670                 cp += sr->isr_len, len -= sr->isr_len;
 671                 wsr++;
 672         }
 673         qsort(results, wsr - results, sizeof(struct wpa_scan_result),
 674               wpa_scan_result_compar);
 675
 676         wpa_printf(MSG_DEBUG, "Received %d bytes of scan results (%d BSSes)",
 677                    len, wsr - results);
 678
 679         return wsr - results;
 680 #undef min
 681 }
 682
 683 static void *
 684 wpa_driver_bsd_init(void *ctx, const char *ifname)
 685 {
 686 #define GETPARAM(drv, param, v) \
 687         (((v) = get80211param(drv, param)) != -1)
 688         struct wpa_driver_bsd_data *drv;
 689
 690         drv = malloc(sizeof(*drv));
 691         if (drv == NULL)
 692                 return NULL;
 693         memset(drv, 0, sizeof(*drv));
 694         /*
 695          * NB: We require the interface name be mappable to an index.
 696          *     This implies we do not support having wpa_supplicant
 697          *     wait for an interface to appear.  This seems ok; that
 698          *     doesn't belong here; it's really the job of devd.
 699          */
 700         drv->ifindex = if_nametoindex(ifname);
 701         if (drv->ifindex == 0) {
 702                 wpa_printf(MSG_DEBUG, "%s: interface %s does not exist",
 703                            __func__, ifname);
 704                 goto fail1;
 705         }
 706         drv->sock = socket(PF_INET, SOCK_DGRAM, 0);
 707         if (drv->sock < 0)
 708                 goto fail1;
 709         drv->route = socket(PF_ROUTE, SOCK_RAW, 0);
 710         if (drv->route < 0)
 711                 goto fail;
 712         eloop_register_read_sock(drv->route,
 713                 wpa_driver_bsd_event_receive, ctx, drv);
 714
 715         drv->ctx = ctx;
 716         strncpy(drv->ifname, ifname, sizeof(drv->ifname));
 717
 718         if (!GETPARAM(drv, IEEE80211_IOC_ROAMING, drv->prev_roaming)) {
 719                 wpa_printf(MSG_DEBUG, "%s: failed to get roaming state: %s",
 720                         __func__, strerror(errno));
 721                 goto fail;
 722         }
 723         if (!GETPARAM(drv, IEEE80211_IOC_PRIVACY, drv->prev_privacy)) {
 724                 wpa_printf(MSG_DEBUG, "%s: failed to get privacy state: %s",
 725                         __func__, strerror(errno));
 726                 goto fail;
 727         }
 728         if (!GETPARAM(drv, IEEE80211_IOC_WPA, drv->prev_wpa)) {
 729                 wpa_printf(MSG_DEBUG, "%s: failed to get wpa state: %s",
 730                         __func__, strerror(errno));
 731                 goto fail;
 732         }
 733         if (set80211param(drv, IEEE80211_IOC_ROAMING, IEEE80211_ROAMING_MANUAL) < 0) {
 734                 wpa_printf(MSG_DEBUG, "%s: failed to set wpa_supplicant-based "
 735                            "roaming: %s", __func__, strerror(errno));
 736                 goto fail;
 737         }
 738
 739         if (set80211param(drv, IEEE80211_IOC_WPA, 1+2) < 0) {
 740                 wpa_printf(MSG_DEBUG, "%s: failed to enable WPA support %s",
 741                            __func__, strerror(errno));
 742                 goto fail;
 743         }
 744
 745         return drv;
 746 fail:
 747         close(drv->sock);
 748 fail1:
 749         free(drv);
 750         return NULL;
 751 #undef GETPARAM
 752 }
 753
 754 static void
 755 wpa_driver_bsd_deinit(void *priv)
 756 {
 757         struct wpa_driver_bsd_data *drv = priv;
 758         int flags;
 759
 760         /* NB: mark interface down */
 761         if (getifflags(drv, &flags) == 0)
 762                 (void) setifflags(drv, flags &~ IFF_UP);
 763
 764         wpa_driver_bsd_set_wpa_internal(drv, drv->prev_wpa, drv->prev_privacy);
 765         if (set80211param(drv, IEEE80211_IOC_ROAMING, drv->prev_roaming) < 0)
 766                 wpa_printf(MSG_DEBUG, "%s: failed to restore roaming state",
 767                         __func__);
 768
 769         (void) close(drv->route);               /* ioctl socket */
 770         (void) close(drv->sock);                /* event socket */
 771         free(drv);
 772 }
 773
 774
 775 struct wpa_driver_ops wpa_driver_bsd_ops = {
 776         .name                   = "bsd",
 777         .desc                   = "BSD 802.11 support (Atheros, etc.)",
 778         .init                   = wpa_driver_bsd_init,
 779         .deinit                 = wpa_driver_bsd_deinit,
 780         .get_bssid              = wpa_driver_bsd_get_bssid,
 781         .get_ssid               = wpa_driver_bsd_get_ssid,
 782         .set_wpa                = wpa_driver_bsd_set_wpa,
 783         .set_key                = wpa_driver_bsd_set_key,
 784         .set_countermeasures    = wpa_driver_bsd_set_countermeasures,
 785         .set_drop_unencrypted   = wpa_driver_bsd_set_drop_unencrypted,
 786         .scan                   = wpa_driver_bsd_scan,
 787         .get_scan_results       = wpa_driver_bsd_get_scan_results,
 788         .deauthenticate         = wpa_driver_bsd_deauthenticate,
 789         .disassociate           = wpa_driver_bsd_disassociate,
 790         .associate              = wpa_driver_bsd_associate,
 791         .set_auth_alg           = wpa_driver_bsd_set_auth_alg,
 792 };