wpa_supplicant/src/drivers/driver_bsd.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
  15 #include "includes.h"
  16 #include <sys/ioctl.h>
  17
  18 #include "common.h"
  19 #include "driver.h"
  20 #include "eloop.h"
  21 #include "ieee802_11_defs.h"
  22
  23 #include <net/if.h>
  24
  25 #ifdef __NetBSD__
  26 #include <net/if_ether.h>
  27 #define COMPAT_FREEBSD_NET80211
  28 #else
  29 #include <net/ethernet.h>
  30 #endif
  31
  32 #include <net80211/ieee80211.h>
  33 #include <net80211/ieee80211_crypto.h>
  34 #include <net80211/ieee80211_ioctl.h>
  35
  36 struct wpa_driver_bsd_data {
  37         int     sock;                   /* open socket for 802.11 ioctls */
  38         int     route;                  /* routing socket for events */
  39         char    ifname[IFNAMSIZ+1];     /* interface name */
  40         unsigned int ifindex;           /* interface index */
  41         void    *ctx;
  42         int     prev_roaming;           /* roaming state to restore on deinit */
  43         int     prev_privacy;           /* privacy state to restore on deinit */
  44         int     prev_wpa;               /* wpa state to restore on deinit */
  45 };
  46
  47 static int
  48 set80211var(struct wpa_driver_bsd_data *drv, int op, const void *arg, int arg_len)
  49 {
  50         struct ieee80211req ireq;
  51
  52         os_memset(&ireq, 0, sizeof(ireq));
  53         os_strlcpy(ireq.i_name, drv->ifname, IFNAMSIZ);
  54         ireq.i_type = op;
  55         ireq.i_len = arg_len;
  56         ireq.i_data = (void *) arg;
  57
  58         if (ioctl(drv->sock, SIOCS80211, &ireq) < 0) {
  59                 fprintf(stderr, "ioctl[SIOCS80211, op %u, len %u]: %s\n",
  60                         op, arg_len, strerror(errno));
  61                 return -1;
  62         }
  63         return 0;
  64 }
  65
  66 static int
  67 get80211var(struct wpa_driver_bsd_data *drv, int op, void *arg, int arg_len)
  68 {
  69         struct ieee80211req ireq;
  70
  71         os_memset(&ireq, 0, sizeof(ireq));
  72         os_strlcpy(ireq.i_name, drv->ifname, IFNAMSIZ);
  73         ireq.i_type = op;
  74         ireq.i_len = arg_len;
  75         ireq.i_data = arg;
  76
  77         if (ioctl(drv->sock, SIOCG80211, &ireq) < 0) {
  78                 fprintf(stderr, "ioctl[SIOCG80211, op %u, len %u]: %s\n",
  79                         op, arg_len, strerror(errno));
  80                 return -1;
  81         }
  82         return ireq.i_len;
  83 }
  84
  85 static int
  86 set80211param(struct wpa_driver_bsd_data *drv, int op, int arg)
  87 {
  88         struct ieee80211req ireq;
  89
  90         os_memset(&ireq, 0, sizeof(ireq));
  91         os_strlcpy(ireq.i_name, drv->ifname, IFNAMSIZ);
  92         ireq.i_type = op;
  93         ireq.i_val = arg;
  94
  95         if (ioctl(drv->sock, SIOCS80211, &ireq) < 0) {
  96                 fprintf(stderr, "ioctl[SIOCS80211, op %u, arg 0x%x]: %s\n",
  97                         op, arg, strerror(errno));
  98                 return -1;
  99         }
 100         return 0;
 101 }
 102
 103 static int
 104 get80211param(struct wpa_driver_bsd_data *drv, int op)
 105 {
 106         struct ieee80211req ireq;
 107
 108         os_memset(&ireq, 0, sizeof(ireq));
 109         os_strlcpy(ireq.i_name, drv->ifname, IFNAMSIZ);
 110         ireq.i_type = op;
 111
 112         if (ioctl(drv->sock, SIOCG80211, &ireq) < 0) {
 113                 fprintf(stderr, "ioctl[SIOCG80211, op %u]: %s\n",
 114                         op, strerror(errno));
 115                 return -1;
 116         }
 117         return ireq.i_val;
 118 }
 119
 120 static int
 121 getifflags(struct wpa_driver_bsd_data *drv, int *flags)
 122 {
 123         struct ifreq ifr;
 124
 125         os_memset(&ifr, 0, sizeof(ifr));
 126         os_strlcpy(ifr.ifr_name, drv->ifname, sizeof(ifr.ifr_name));
 127         if (ioctl(drv->sock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
 128                 perror("SIOCGIFFLAGS");
 129                 return errno;
 130         }
 131         *flags = ifr.ifr_flags & 0xffff;
 132         return 0;
 133 }
 134
 135 static int
 136 setifflags(struct wpa_driver_bsd_data *drv, int flags)
 137 {
 138         struct ifreq ifr;
 139
 140         os_memset(&ifr, 0, sizeof(ifr));
 141         os_strlcpy(ifr.ifr_name, drv->ifname, sizeof(ifr.ifr_name));
 142         ifr.ifr_flags = flags & 0xffff;
 143         if (ioctl(drv->sock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) {
 144                 perror("SIOCSIFFLAGS");
 145                 return errno;
 146         }
 147         return 0;
 148 }
 149
 150 static int
 151 wpa_driver_bsd_get_bssid(void *priv, u8 *bssid)
 152 {
 153         struct wpa_driver_bsd_data *drv = priv;
 154
 155         return get80211var(drv, IEEE80211_IOC_BSSID,
 156                 bssid, IEEE80211_ADDR_LEN) < 0 ? -1 : 0;
 157 }
 158
 159 #if 0
 160 static int
 161 wpa_driver_bsd_set_bssid(void *priv, const char *bssid)
 162 {
 163         struct wpa_driver_bsd_data *drv = priv;
 164
 165         return set80211var(drv, IEEE80211_IOC_BSSID,
 166                 bssid, IEEE80211_ADDR_LEN);
 167 }
 168 #endif
 169
 170 static int
 171 wpa_driver_bsd_get_ssid(void *priv, u8 *ssid)
 172 {
 173         struct wpa_driver_bsd_data *drv = priv;
 174
 175         return get80211var(drv, IEEE80211_IOC_SSID,
 176                 ssid, IEEE80211_NWID_LEN);
 177 }
 178
 179 static int
 180 wpa_driver_bsd_set_ssid(void *priv, const u8 *ssid,
 181                              size_t ssid_len)
 182 {
 183         struct wpa_driver_bsd_data *drv = priv;
 184
 185         return set80211var(drv, IEEE80211_IOC_SSID, ssid, ssid_len);
 186 }
 187
 188 static int
 189 wpa_driver_bsd_set_wpa_ie(struct wpa_driver_bsd_data *drv,
 190         const u8 *wpa_ie, size_t wpa_ie_len)
 191 {
 192         return set80211var(drv, IEEE80211_IOC_OPTIE, wpa_ie, wpa_ie_len);
 193 }
 194
 195 static int
 196 wpa_driver_bsd_set_wpa_internal(void *priv, int wpa, int privacy)
 197 {
 198         struct wpa_driver_bsd_data *drv = priv;
 199         int ret = 0;
 200
 201         wpa_printf(MSG_DEBUG, "%s: wpa=%d privacy=%d",
 202                 __FUNCTION__, wpa, privacy);
 203
 204         if (!wpa && wpa_driver_bsd_set_wpa_ie(drv, NULL, 0) < 0)
 205                 ret = -1;
 206         if (set80211param(drv, IEEE80211_IOC_PRIVACY, privacy) < 0)
 207                 ret = -1;
 208         if (set80211param(drv, IEEE80211_IOC_WPA, wpa) < 0)
 209                 ret = -1;
 210
 211         return ret;
 212 }
 213
 214 static int
 215 wpa_driver_bsd_set_wpa(void *priv, int enabled)
 216 {
 217         wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
 218
 219         return wpa_driver_bsd_set_wpa_internal(priv, enabled ? 3 : 0, enabled);
 220 }
 221
 222 static int
 223 wpa_driver_bsd_del_key(struct wpa_driver_bsd_data *drv, int key_idx,
 224                        const unsigned char *addr)
 225 {
 226         struct ieee80211req_del_key wk;
 227
 228         os_memset(&wk, 0, sizeof(wk));
 229         if (addr != NULL &&
 230             bcmp(addr, "\xff\xff\xff\xff\xff\xff", IEEE80211_ADDR_LEN) != 0) {
 231                 struct ether_addr ea;
 232
 233                 os_memcpy(&ea, addr, IEEE80211_ADDR_LEN);
 234                 wpa_printf(MSG_DEBUG, "%s: addr=%s keyidx=%d",
 235                         __func__, ether_ntoa(&ea), key_idx);
 236                 os_memcpy(wk.idk_macaddr, addr, IEEE80211_ADDR_LEN);
 237                 wk.idk_keyix = (uint8_t) IEEE80211_KEYIX_NONE;
 238         } else {
 239                 wpa_printf(MSG_DEBUG, "%s: keyidx=%d", __func__, key_idx);
 240                 wk.idk_keyix = key_idx;
 241         }
 242         return set80211var(drv, IEEE80211_IOC_DELKEY, &wk, sizeof(wk));
 243 }
 244
 245 static int
 246 wpa_driver_bsd_set_key(void *priv, wpa_alg alg,
 247                        const unsigned char *addr, int key_idx, int set_tx,
 248                        const u8 *seq, size_t seq_len,
 249                        const u8 *key, size_t key_len)
 250 {
 251         struct wpa_driver_bsd_data *drv = priv;
 252         struct ieee80211req_key wk;
 253         struct ether_addr ea;
 254         char *alg_name;
 255         u_int8_t cipher;
 256
 257         if (alg == WPA_ALG_NONE)
 258                 return wpa_driver_bsd_del_key(drv, key_idx, addr);
 259
 260         switch (alg) {
 261         case WPA_ALG_WEP:
 262                 alg_name = "WEP";
 263                 cipher = IEEE80211_CIPHER_WEP;
 264                 break;
 265         case WPA_ALG_TKIP:
 266                 alg_name = "TKIP";
 267                 cipher = IEEE80211_CIPHER_TKIP;
 268                 break;
 269         case WPA_ALG_CCMP:
 270                 alg_name = "CCMP";
 271                 cipher = IEEE80211_CIPHER_AES_CCM;
 272                 break;
 273         default:
 274                 wpa_printf(MSG_DEBUG, "%s: unknown/unsupported algorithm %d",
 275                         __func__, alg);
 276                 return -1;
 277         }
 278
 279         os_memcpy(&ea, addr, IEEE80211_ADDR_LEN);
 280         wpa_printf(MSG_DEBUG,
 281                 "%s: alg=%s addr=%s key_idx=%d set_tx=%d seq_len=%zu key_len=%zu",
 282                 __func__, alg_name, ether_ntoa(&ea), key_idx, set_tx,
 283                 seq_len, key_len);
 284
 285         if (seq_len > sizeof(u_int64_t)) {
 286                 wpa_printf(MSG_DEBUG, "%s: seq_len %zu too big",
 287                         __func__, seq_len);
 288                 return -2;
 289         }
 290         if (key_len > sizeof(wk.ik_keydata)) {
 291                 wpa_printf(MSG_DEBUG, "%s: key length %zu too big",
 292                         __func__, key_len);
 293                 return -3;
 294         }
 295
 296         os_memset(&wk, 0, sizeof(wk));
 297         wk.ik_type = cipher;
 298         wk.ik_flags = IEEE80211_KEY_RECV;
 299         if (set_tx)
 300                 wk.ik_flags |= IEEE80211_KEY_XMIT;
 301         os_memcpy(wk.ik_macaddr, addr, IEEE80211_ADDR_LEN);
 302         /*
 303          * Deduce whether group/global or unicast key by checking
 304          * the address (yech).  Note also that we can only mark global
 305          * keys default; doing this for a unicast key is an error.
 306          */
 307         if (bcmp(addr, "\xff\xff\xff\xff\xff\xff", IEEE80211_ADDR_LEN) == 0) {
 308                 wk.ik_flags |= IEEE80211_KEY_GROUP;
 309                 wk.ik_keyix = key_idx;
 310         } else {
 311                 wk.ik_keyix = (key_idx == 0 ? IEEE80211_KEYIX_NONE : key_idx);
 312         }
 313         if (wk.ik_keyix != IEEE80211_KEYIX_NONE && set_tx)
 314                 wk.ik_flags |= IEEE80211_KEY_DEFAULT;
 315         wk.ik_keylen = key_len;
 316         os_memcpy(&wk.ik_keyrsc, seq, seq_len);
 317         os_memcpy(wk.ik_keydata, key, key_len);
 318
 319         return set80211var(drv, IEEE80211_IOC_WPAKEY, &wk, sizeof(wk));
 320 }
 321
 322 static int
 323 wpa_driver_bsd_set_countermeasures(void *priv, int enabled)
 324 {
 325         struct wpa_driver_bsd_data *drv = priv;
 326
 327         wpa_printf(MSG_DEBUG, "%s: enabled=%d", __func__, enabled);
 328         return set80211param(drv, IEEE80211_IOC_COUNTERMEASURES, enabled);
 329 }
 330
 331
 332 static int
 333 wpa_driver_bsd_set_drop_unencrypted(void *priv, int enabled)
 334 {
 335         struct wpa_driver_bsd_data *drv = priv;
 336
 337         wpa_printf(MSG_DEBUG, "%s: enabled=%d", __func__, enabled);
 338         return set80211param(drv, IEEE80211_IOC_DROPUNENCRYPTED, enabled);
 339 }
 340
 341 static int
 342 wpa_driver_bsd_deauthenticate(void *priv, const u8 *addr, int reason_code)
 343 {
 344         struct wpa_driver_bsd_data *drv = priv;
 345         struct ieee80211req_mlme mlme;
 346
 347         wpa_printf(MSG_DEBUG, "%s", __func__);
 348         os_memset(&mlme, 0, sizeof(mlme));
 349         mlme.im_op = IEEE80211_MLME_DEAUTH;
 350         mlme.im_reason = reason_code;
 351         os_memcpy(mlme.im_macaddr, addr, IEEE80211_ADDR_LEN);
 352         return set80211var(drv, IEEE80211_IOC_MLME, &mlme, sizeof(mlme));
 353 }
 354
 355 static int
 356 wpa_driver_bsd_disassociate(void *priv, const u8 *addr, int reason_code)
 357 {
 358         struct wpa_driver_bsd_data *drv = priv;
 359         struct ieee80211req_mlme mlme;
 360
 361         wpa_printf(MSG_DEBUG, "%s", __func__);
 362         os_memset(&mlme, 0, sizeof(mlme));
 363         mlme.im_op = IEEE80211_MLME_DISASSOC;
 364         mlme.im_reason = reason_code;
 365         os_memcpy(mlme.im_macaddr, addr, IEEE80211_ADDR_LEN);
 366         return set80211var(drv, IEEE80211_IOC_MLME, &mlme, sizeof(mlme));
 367 }
 368
 369 static int
 370 wpa_driver_bsd_associate(void *priv, struct wpa_driver_associate_params *params)
 371 {
 372         struct wpa_driver_bsd_data *drv = priv;
 373         struct ieee80211req_mlme mlme;
 374         int privacy;
 375
 376         wpa_printf(MSG_DEBUG,
 377                 "%s: ssid '%.*s' wpa ie len %u pairwise %u group %u key mgmt %u"
 378                 , __func__
 379                 , params->ssid_len, params->ssid
 380                 , params->wpa_ie_len
 381                 , params->pairwise_suite
 382                 , params->group_suite
 383                 , params->key_mgmt_suite
 384         );
 385
 386         /* XXX error handling is wrong but unclear what to do... */
 387         if (wpa_driver_bsd_set_wpa_ie(drv, params->wpa_ie, params->wpa_ie_len) < 0)
 388                 return -1;
 389 #ifndef NEW_FREEBSD_MLME_ASSOC
 390         if (wpa_driver_bsd_set_ssid(drv, params->ssid, params->ssid_len) < 0)
 391                 return -1;
 392 #endif
 393
 394         privacy = !(params->pairwise_suite == CIPHER_NONE &&
 395             params->group_suite == CIPHER_NONE &&
 396             params->key_mgmt_suite == KEY_MGMT_NONE &&
 397             params->wpa_ie_len == 0);
 398         wpa_printf(MSG_DEBUG, "%s: set PRIVACY %u", __func__, privacy);
 399
 400         if (set80211param(drv, IEEE80211_IOC_PRIVACY, privacy) < 0)
 401                 return -1;
 402
 403         if (params->wpa_ie_len &&
 404             set80211param(drv, IEEE80211_IOC_WPA,
 405                           params->wpa_ie[0] == WLAN_EID_RSN ? 2 : 1) < 0)
 406                 return -1;
 407
 408         os_memset(&mlme, 0, sizeof(mlme));
 409         mlme.im_op = IEEE80211_MLME_ASSOC;
 410 #ifdef NEW_FREEBSD_MLME_ASSOC
 411         if (params->ssid != NULL)
 412                 os_memcpy(mlme.im_ssid, params->ssid, params->ssid_len);
 413         mlme.im_ssid_len = params->ssid_len;
 414 #endif
 415         if (params->bssid != NULL)
 416                 os_memcpy(mlme.im_macaddr, params->bssid, IEEE80211_ADDR_LEN);
 417         if (set80211var(drv, IEEE80211_IOC_MLME, &mlme, sizeof(mlme)) < 0)
 418                 return -1;
 419         return 0;
 420 }
 421
 422 static int
 423 wpa_driver_bsd_set_auth_alg(void *priv, int auth_alg)
 424 {
 425         struct wpa_driver_bsd_data *drv = priv;
 426         int authmode;
 427
 428         if ((auth_alg & AUTH_ALG_OPEN_SYSTEM) &&
 429             (auth_alg & AUTH_ALG_SHARED_KEY))
 430                 authmode = IEEE80211_AUTH_AUTO;
 431         else if (auth_alg & AUTH_ALG_SHARED_KEY)
 432                 authmode = IEEE80211_AUTH_SHARED;
 433         else
 434                 authmode = IEEE80211_AUTH_OPEN;
 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 #if __FreeBSD__
 459 #include <net80211/ieee80211_freebsd.h>
 460 #endif
 461 #if __NetBSD__
 462 #include <net80211/ieee80211_netbsd.h>
 463 #endif
 464
 465 static void
 466 wpa_driver_bsd_event_receive(int sock, void *ctx, void *sock_ctx)
 467 {
 468         struct wpa_driver_bsd_data *drv = sock_ctx;
 469         char buf[2048];
 470         struct if_announcemsghdr *ifan;
 471         struct if_msghdr *ifm;
 472         struct rt_msghdr *rtm;
 473         union wpa_event_data event;
 474         struct ieee80211_michael_event *mic;
 475         int n;
 476
 477         n = read(sock, buf, sizeof(buf));
 478         if (n < 0) {
 479                 if (errno != EINTR && errno != EAGAIN)
 480                         perror("read(PF_ROUTE)");
 481                 return;
 482         }
 483
 484         rtm = (struct rt_msghdr *) buf;
 485         if (rtm->rtm_version != RTM_VERSION) {
 486                 wpa_printf(MSG_DEBUG, "Routing message version %d not "
 487                         "understood\n", rtm->rtm_version);
 488                 return;
 489         }
 490         os_memset(&event, 0, sizeof(event));
 491         switch (rtm->rtm_type) {
 492         case RTM_IFANNOUNCE:
 493                 ifan = (struct if_announcemsghdr *) rtm;
 494                 if (ifan->ifan_index != drv->ifindex)
 495                         break;
 496                 strlcpy(event.interface_status.ifname, drv->ifname,
 497                         sizeof(event.interface_status.ifname));
 498                 switch (ifan->ifan_what) {
 499                 case IFAN_DEPARTURE:
 500                         event.interface_status.ievent = EVENT_INTERFACE_REMOVED;
 501                 default:
 502                         return;
 503                 }
 504                 wpa_printf(MSG_DEBUG, "RTM_IFANNOUNCE: Interface '%s' %s",
 505                            event.interface_status.ifname,
 506                            ifan->ifan_what == IFAN_DEPARTURE ?
 507                                 "removed" : "added");
 508                 wpa_supplicant_event(ctx, EVENT_INTERFACE_STATUS, &event);
 509                 break;
 510         case RTM_IEEE80211:
 511                 ifan = (struct if_announcemsghdr *) rtm;
 512                 if (ifan->ifan_index != drv->ifindex)
 513                         break;
 514                 switch (ifan->ifan_what) {
 515                 case RTM_IEEE80211_ASSOC:
 516                 case RTM_IEEE80211_REASSOC:
 517                         wpa_supplicant_event(ctx, EVENT_ASSOC, NULL);
 518                         break;
 519                 case RTM_IEEE80211_DISASSOC:
 520                         wpa_supplicant_event(ctx, EVENT_DISASSOC, NULL);
 521                         break;
 522                 case RTM_IEEE80211_SCAN:
 523                         wpa_supplicant_event(ctx, EVENT_SCAN_RESULTS, NULL);
 524                         break;
 525                 case RTM_IEEE80211_REPLAY:
 526                         /* ignore */
 527                         break;
 528                 case RTM_IEEE80211_MICHAEL:
 529                         mic = (struct ieee80211_michael_event *) &ifan[1];
 530                         wpa_printf(MSG_DEBUG,
 531                                 "Michael MIC failure wireless event: "
 532                                 "keyix=%u src_addr=" MACSTR, mic->iev_keyix,
 533                                 MAC2STR(mic->iev_src));
 534
 535                         os_memset(&event, 0, sizeof(event));
 536                         event.michael_mic_failure.unicast =
 537                                 !IEEE80211_IS_MULTICAST(mic->iev_dst);
 538                         wpa_supplicant_event(ctx, EVENT_MICHAEL_MIC_FAILURE,
 539                                 &event);
 540                         break;
 541                 }
 542                 break;
 543         case RTM_IFINFO:
 544                 ifm = (struct if_msghdr *) rtm;
 545                 if (ifm->ifm_index != drv->ifindex)
 546                         break;
 547                 if ((rtm->rtm_flags & RTF_UP) == 0) {
 548                         strlcpy(event.interface_status.ifname, drv->ifname,
 549                                 sizeof(event.interface_status.ifname));
 550                         event.interface_status.ievent = EVENT_INTERFACE_REMOVED;
 551                         wpa_printf(MSG_DEBUG, "RTM_IFINFO: Interface '%s' DOWN",
 552                                    event.interface_status.ifname);
 553                         wpa_supplicant_event(ctx, EVENT_INTERFACE_STATUS, &event);
 554                 }
 555                 break;
 556         }
 557 }
 558
 559 /* Compare function for sorting scan results. Return >0 if @b is consider
 560  * better. */
 561 static int
 562 wpa_scan_result_compar(const void *a, const void *b)
 563 {
 564         const struct wpa_scan_result *wa = a;
 565         const struct wpa_scan_result *wb = b;
 566
 567         /* WPA/WPA2 support preferred */
 568         if ((wb->wpa_ie_len || wb->rsn_ie_len) &&
 569             !(wa->wpa_ie_len || wa->rsn_ie_len))
 570                 return 1;
 571         if (!(wb->wpa_ie_len || wb->rsn_ie_len) &&
 572             (wa->wpa_ie_len || wa->rsn_ie_len))
 573                 return -1;
 574
 575         /* privacy support preferred */
 576         if ((wa->caps & IEEE80211_CAPINFO_PRIVACY) &&
 577             (wb->caps & IEEE80211_CAPINFO_PRIVACY) == 0)
 578                 return 1;
 579         if ((wa->caps & IEEE80211_CAPINFO_PRIVACY) == 0 &&
 580             (wb->caps & IEEE80211_CAPINFO_PRIVACY))
 581                 return -1;
 582
 583         /* best/max rate preferred if signal level close enough XXX */
 584         if (wa->maxrate != wb->maxrate && abs(wb->level - wa->level) < 5)
 585                 return wb->maxrate - wa->maxrate;
 586
 587         /* use freq for channel preference */
 588
 589         /* all things being equal, use signal level */
 590         return wb->level - wa->level;
 591 }
 592
 593 static int
 594 getmaxrate(uint8_t rates[15], uint8_t nrates)
 595 {
 596         int i, maxrate = -1;
 597
 598         for (i = 0; i < nrates; i++) {
 599                 int rate = rates[i] & IEEE80211_RATE_VAL;
 600                 if (rate > maxrate)
 601                         rate = maxrate;
 602         }
 603         return maxrate;
 604 }
 605
 606 /* unalligned little endian access */
 607 #define LE_READ_4(p)                                    \
 608         ((u_int32_t)                                    \
 609          ((((const u_int8_t *)(p))[0]      ) |          \
 610           (((const u_int8_t *)(p))[1] <<  8) |          \
 611           (((const u_int8_t *)(p))[2] << 16) |          \
 612           (((const u_int8_t *)(p))[3] << 24)))
 613
 614 static int __inline
 615 iswpaoui(const u_int8_t *frm)
 616 {
 617         return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI);
 618 }
 619
 620 static int
 621 wpa_driver_bsd_get_scan_results(void *priv,
 622                                      struct wpa_scan_result *results,
 623                                      size_t max_size)
 624 {
 625 #define min(a,b)        ((a)>(b)?(b):(a))
 626         struct wpa_driver_bsd_data *drv = priv;
 627         uint8_t buf[24*1024];
 628         uint8_t *cp, *vp;
 629         struct ieee80211req_scan_result *sr;
 630         struct wpa_scan_result *wsr;
 631         int len, ielen;
 632
 633         os_memset(results, 0, max_size * sizeof(struct wpa_scan_result));
 634
 635         len = get80211var(drv, IEEE80211_IOC_SCAN_RESULTS, buf, sizeof(buf));
 636         if (len < 0)
 637                 return -1;
 638         cp = buf;
 639         wsr = results;
 640         while (len >= sizeof(struct ieee80211req_scan_result)) {
 641                 sr = (struct ieee80211req_scan_result *) cp;
 642                 os_memcpy(wsr->bssid, sr->isr_bssid, IEEE80211_ADDR_LEN);
 643                 wsr->ssid_len = sr->isr_ssid_len;
 644                 wsr->freq = sr->isr_freq;
 645                 wsr->noise = sr->isr_noise;
 646                 wsr->qual = sr->isr_rssi;
 647                 wsr->level = 0;         /* XXX? */
 648                 wsr->caps = sr->isr_capinfo;
 649                 wsr->maxrate = getmaxrate(sr->isr_rates, sr->isr_nrates);
 650                 vp = (u_int8_t *)(sr+1);
 651                 os_memcpy(wsr->ssid, vp, sr->isr_ssid_len);
 652                 if (sr->isr_ie_len > 0) {
 653                         vp += sr->isr_ssid_len;
 654                         ielen = sr->isr_ie_len;
 655                         while (ielen > 0) {
 656                                 switch (vp[0]) {
 657                                 case IEEE80211_ELEMID_VENDOR:
 658                                         if (!iswpaoui(vp))
 659                                                 break;
 660                                         wsr->wpa_ie_len =
 661                                             min(2+vp[1], SSID_MAX_WPA_IE_LEN);
 662                                         os_memcpy(wsr->wpa_ie, vp,
 663                                                   wsr->wpa_ie_len);
 664                                         break;
 665                                 case IEEE80211_ELEMID_RSN:
 666                                         wsr->rsn_ie_len =
 667                                             min(2+vp[1], SSID_MAX_WPA_IE_LEN);
 668                                         os_memcpy(wsr->rsn_ie, vp,
 669                                                   wsr->rsn_ie_len);
 670                                         break;
 671                                 }
 672                                 ielen -= 2+vp[1];
 673                                 vp += 2+vp[1];
 674                         }
 675                 }
 676
 677                 cp += sr->isr_len, len -= sr->isr_len;
 678                 wsr++;
 679         }
 680         qsort(results, wsr - results, sizeof(struct wpa_scan_result),
 681               wpa_scan_result_compar);
 682
 683         wpa_printf(MSG_DEBUG, "Received %d bytes of scan results (%d BSSes)",
 684                    len, wsr - results);
 685
 686         return wsr - results;
 687 #undef min
 688 }
 689
 690 static void *
 691 wpa_driver_bsd_init(void *ctx, const char *ifname)
 692 {
 693 #define GETPARAM(drv, param, v) \
 694         (((v) = get80211param(drv, param)) != -1)
 695         struct wpa_driver_bsd_data *drv;
 696
 697         drv = os_zalloc(sizeof(*drv));
 698         if (drv == NULL)
 699                 return NULL;
 700         /*
 701          * NB: We require the interface name be mappable to an index.
 702          *     This implies we do not support having wpa_supplicant
 703          *     wait for an interface to appear.  This seems ok; that
 704          *     doesn't belong here; it's really the job of devd.
 705          */
 706         drv->ifindex = if_nametoindex(ifname);
 707         if (drv->ifindex == 0) {
 708                 wpa_printf(MSG_DEBUG, "%s: interface %s does not exist",
 709                            __func__, ifname);
 710                 goto fail1;
 711         }
 712         drv->sock = socket(PF_INET, SOCK_DGRAM, 0);
 713         if (drv->sock < 0)
 714                 goto fail1;
 715         drv->route = socket(PF_ROUTE, SOCK_RAW, 0);
 716         if (drv->route < 0)
 717                 goto fail;
 718         eloop_register_read_sock(drv->route,
 719                 wpa_driver_bsd_event_receive, ctx, drv);
 720
 721         drv->ctx = ctx;
 722         os_strlcpy(drv->ifname, ifname, sizeof(drv->ifname));
 723
 724         if (!GETPARAM(drv, IEEE80211_IOC_ROAMING, drv->prev_roaming)) {
 725                 wpa_printf(MSG_DEBUG, "%s: failed to get roaming state: %s",
 726                         __func__, strerror(errno));
 727                 goto fail;
 728         }
 729         if (!GETPARAM(drv, IEEE80211_IOC_PRIVACY, drv->prev_privacy)) {
 730                 wpa_printf(MSG_DEBUG, "%s: failed to get privacy state: %s",
 731                         __func__, strerror(errno));
 732                 goto fail;
 733         }
 734         if (!GETPARAM(drv, IEEE80211_IOC_WPA, drv->prev_wpa)) {
 735                 wpa_printf(MSG_DEBUG, "%s: failed to get wpa state: %s",
 736                         __func__, strerror(errno));
 737                 goto fail;
 738         }
 739         if (set80211param(drv, IEEE80211_IOC_ROAMING, IEEE80211_ROAMING_MANUAL) < 0) {
 740                 wpa_printf(MSG_DEBUG, "%s: failed to set wpa_supplicant-based "
 741                            "roaming: %s", __func__, strerror(errno));
 742                 goto fail;
 743         }
 744
 745         if (set80211param(drv, IEEE80211_IOC_WPA, 1+2) < 0) {
 746                 wpa_printf(MSG_DEBUG, "%s: failed to enable WPA support %s",
 747                            __func__, strerror(errno));
 748                 goto fail;
 749         }
 750
 751         return drv;
 752 fail:
 753         close(drv->sock);
 754 fail1:
 755         os_free(drv);
 756         return NULL;
 757 #undef GETPARAM
 758 }
 759
 760 static void
 761 wpa_driver_bsd_deinit(void *priv)
 762 {
 763         struct wpa_driver_bsd_data *drv = priv;
 764         int flags;
 765
 766         eloop_unregister_read_sock(drv->route);
 767
 768         /* NB: mark interface down */
 769         if (getifflags(drv, &flags) == 0)
 770                 (void) setifflags(drv, flags &~ IFF_UP);
 771
 772         wpa_driver_bsd_set_wpa_internal(drv, drv->prev_wpa, drv->prev_privacy);
 773         if (set80211param(drv, IEEE80211_IOC_ROAMING, drv->prev_roaming) < 0)
 774                 wpa_printf(MSG_DEBUG, "%s: failed to restore roaming state",
 775                         __func__);
 776
 777         (void) close(drv->route);               /* ioctl socket */
 778         (void) close(drv->sock);                /* event socket */
 779         os_free(drv);
 780 }
 781
 782
 783 const struct wpa_driver_ops wpa_driver_bsd_ops = {
 784         .name                   = "bsd",
 785         .desc                   = "BSD 802.11 support (Atheros, etc.)",
 786         .init                   = wpa_driver_bsd_init,
 787         .deinit                 = wpa_driver_bsd_deinit,
 788         .get_bssid              = wpa_driver_bsd_get_bssid,
 789         .get_ssid               = wpa_driver_bsd_get_ssid,
 790         .set_wpa                = wpa_driver_bsd_set_wpa,
 791         .set_key                = wpa_driver_bsd_set_key,
 792         .set_countermeasures    = wpa_driver_bsd_set_countermeasures,
 793         .set_drop_unencrypted   = wpa_driver_bsd_set_drop_unencrypted,
 794         .scan                   = wpa_driver_bsd_scan,
 795         .get_scan_results       = wpa_driver_bsd_get_scan_results,
 796         .deauthenticate         = wpa_driver_bsd_deauthenticate,
 797         .disassociate           = wpa_driver_bsd_disassociate,
 798         .associate              = wpa_driver_bsd_associate,
 799         .set_auth_alg           = wpa_driver_bsd_set_auth_alg,
 800 };