src/drivers/driver_nl80211_scan.c

   1 /*
   2  * Driver interaction with Linux nl80211/cfg80211 - Scanning
   3  * Copyright (c) 2002-2014, Jouni Malinen <j@w1.fi>
   4  * Copyright (c) 2007, Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright (c) 2009-2010, Atheros Communications
   6  *
   7  * This software may be distributed under the terms of the BSD license.
   8  * See README for more details.
   9  */
  10
  11 #include "includes.h"
  12 #include <netlink/genl/genl.h>
  13
  14 #include "utils/common.h"
  15 #include "utils/eloop.h"
  16 #include "common/ieee802_11_defs.h"
  17 #include "common/qca-vendor.h"
  18 #include "driver_nl80211.h"
  19
  20
  21 static int get_noise_for_scan_results(struct nl_msg *msg, void *arg)
  22 {
  23         struct nlattr *tb[NL80211_ATTR_MAX + 1];
  24         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
  25         struct nlattr *sinfo[NL80211_SURVEY_INFO_MAX + 1];
  26         static struct nla_policy survey_policy[NL80211_SURVEY_INFO_MAX + 1] = {
  27                 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
  28                 [NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 },
  29         };
  30         struct wpa_scan_results *scan_results = arg;
  31         struct wpa_scan_res *scan_res;
  32         size_t i;
  33
  34         nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
  35                   genlmsg_attrlen(gnlh, 0), NULL);
  36
  37         if (!tb[NL80211_ATTR_SURVEY_INFO]) {
  38                 wpa_printf(MSG_DEBUG, "nl80211: Survey data missing");
  39                 return NL_SKIP;
  40         }
  41
  42         if (nla_parse_nested(sinfo, NL80211_SURVEY_INFO_MAX,
  43                              tb[NL80211_ATTR_SURVEY_INFO],
  44                              survey_policy)) {
  45                 wpa_printf(MSG_DEBUG, "nl80211: Failed to parse nested "
  46                            "attributes");
  47                 return NL_SKIP;
  48         }
  49
  50         if (!sinfo[NL80211_SURVEY_INFO_NOISE])
  51                 return NL_SKIP;
  52
  53         if (!sinfo[NL80211_SURVEY_INFO_FREQUENCY])
  54                 return NL_SKIP;
  55
  56         for (i = 0; i < scan_results->num; ++i) {
  57                 scan_res = scan_results->res[i];
  58                 if (!scan_res)
  59                         continue;
  60                 if ((int) nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]) !=
  61                     scan_res->freq)
  62                         continue;
  63                 if (!(scan_res->flags & WPA_SCAN_NOISE_INVALID))
  64                         continue;
  65                 scan_res->noise = (s8)
  66                         nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]);
  67                 scan_res->flags &= ~WPA_SCAN_NOISE_INVALID;
  68         }
  69
  70         return NL_SKIP;
  71 }
  72
  73
  74 static int nl80211_get_noise_for_scan_results(
  75         struct wpa_driver_nl80211_data *drv,
  76         struct wpa_scan_results *scan_res)
  77 {
  78         struct nl_msg *msg;
  79
  80         msg = nl80211_drv_msg(drv, NLM_F_DUMP, NL80211_CMD_GET_SURVEY);
  81         return send_and_recv_msgs(drv, msg, get_noise_for_scan_results,
  82                                   scan_res);
  83 }
  84
  85
  86 /**
  87  * wpa_driver_nl80211_scan_timeout - Scan timeout to report scan completion
  88  * @eloop_ctx: Driver private data
  89  * @timeout_ctx: ctx argument given to wpa_driver_nl80211_init()
  90  *
  91  * This function can be used as registered timeout when starting a scan to
  92  * generate a scan completed event if the driver does not report this.
  93  */
  94 void wpa_driver_nl80211_scan_timeout(void *eloop_ctx, void *timeout_ctx)
  95 {
  96         struct wpa_driver_nl80211_data *drv = eloop_ctx;
  97         if (drv->ap_scan_as_station != NL80211_IFTYPE_UNSPECIFIED) {
  98                 wpa_driver_nl80211_set_mode(drv->first_bss,
  99                                             drv->ap_scan_as_station);
 100                 drv->ap_scan_as_station = NL80211_IFTYPE_UNSPECIFIED;
 101         }
 102         wpa_printf(MSG_DEBUG, "Scan timeout - try to get results");
 103         wpa_supplicant_event(timeout_ctx, EVENT_SCAN_RESULTS, NULL);
 104 }
 105
 106
 107 static struct nl_msg *
 108 nl80211_scan_common(struct i802_bss *bss, u8 cmd,
 109                     struct wpa_driver_scan_params *params)
 110 {
 111         struct wpa_driver_nl80211_data *drv = bss->drv;
 112         struct nl_msg *msg;
 113         size_t i;
 114         u32 scan_flags = 0;
 115
 116         msg = nl80211_cmd_msg(bss, 0, cmd);
 117         if (!msg)
 118                 return NULL;
 119
 120         if (params->num_ssids) {
 121                 struct nlattr *ssids;
 122
 123                 ssids = nla_nest_start(msg, NL80211_ATTR_SCAN_SSIDS);
 124                 if (ssids == NULL)
 125                         goto fail;
 126                 for (i = 0; i < params->num_ssids; i++) {
 127                         wpa_hexdump_ascii(MSG_MSGDUMP, "nl80211: Scan SSID",
 128                                           params->ssids[i].ssid,
 129                                           params->ssids[i].ssid_len);
 130                         if (nla_put(msg, i + 1, params->ssids[i].ssid_len,
 131                                     params->ssids[i].ssid))
 132                                 goto fail;
 133                 }
 134                 nla_nest_end(msg, ssids);
 135         }
 136
 137         if (params->extra_ies) {
 138                 wpa_hexdump(MSG_MSGDUMP, "nl80211: Scan extra IEs",
 139                             params->extra_ies, params->extra_ies_len);
 140                 if (nla_put(msg, NL80211_ATTR_IE, params->extra_ies_len,
 141                             params->extra_ies))
 142                         goto fail;
 143         }
 144
 145         if (params->freqs) {
 146                 struct nlattr *freqs;
 147                 freqs = nla_nest_start(msg, NL80211_ATTR_SCAN_FREQUENCIES);
 148                 if (freqs == NULL)
 149                         goto fail;
 150                 for (i = 0; params->freqs[i]; i++) {
 151                         wpa_printf(MSG_MSGDUMP, "nl80211: Scan frequency %u "
 152                                    "MHz", params->freqs[i]);
 153                         if (nla_put_u32(msg, i + 1, params->freqs[i]))
 154                                 goto fail;
 155                 }
 156                 nla_nest_end(msg, freqs);
 157         }
 158
 159         os_free(drv->filter_ssids);
 160         drv->filter_ssids = params->filter_ssids;
 161         params->filter_ssids = NULL;
 162         drv->num_filter_ssids = params->num_filter_ssids;
 163
 164         if (params->only_new_results) {
 165                 wpa_printf(MSG_DEBUG, "nl80211: Add NL80211_SCAN_FLAG_FLUSH");
 166                 scan_flags |= NL80211_SCAN_FLAG_FLUSH;
 167         }
 168
 169         if (params->low_priority && drv->have_low_prio_scan) {
 170                 wpa_printf(MSG_DEBUG,
 171                            "nl80211: Add NL80211_SCAN_FLAG_LOW_PRIORITY");
 172                 scan_flags |= NL80211_SCAN_FLAG_LOW_PRIORITY;
 173         }
 174
 175         if (params->mac_addr_rand) {
 176                 wpa_printf(MSG_DEBUG,
 177                            "nl80211: Add NL80211_SCAN_FLAG_RANDOM_ADDR");
 178                 scan_flags |= NL80211_SCAN_FLAG_RANDOM_ADDR;
 179
 180                 if (params->mac_addr) {
 181                         wpa_printf(MSG_DEBUG, "nl80211: MAC address: " MACSTR,
 182                                    MAC2STR(params->mac_addr));
 183                         if (nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN,
 184                                     params->mac_addr))
 185                                 goto fail;
 186                 }
 187
 188                 if (params->mac_addr_mask) {
 189                         wpa_printf(MSG_DEBUG, "nl80211: MAC address mask: "
 190                                    MACSTR, MAC2STR(params->mac_addr_mask));
 191                         if (nla_put(msg, NL80211_ATTR_MAC_MASK, ETH_ALEN,
 192                                     params->mac_addr_mask))
 193                                 goto fail;
 194                 }
 195         }
 196
 197         if (scan_flags &&
 198             nla_put_u32(msg, NL80211_ATTR_SCAN_FLAGS, scan_flags))
 199                 goto fail;
 200
 201         return msg;
 202
 203 fail:
 204         nlmsg_free(msg);
 205         return NULL;
 206 }
 207
 208
 209 /**
 210  * wpa_driver_nl80211_scan - Request the driver to initiate scan
 211  * @bss: Pointer to private driver data from wpa_driver_nl80211_init()
 212  * @params: Scan parameters
 213  * Returns: 0 on success, -1 on failure
 214  */
 215 int wpa_driver_nl80211_scan(struct i802_bss *bss,
 216                             struct wpa_driver_scan_params *params)
 217 {
 218         struct wpa_driver_nl80211_data *drv = bss->drv;
 219         int ret = -1, timeout;
 220         struct nl_msg *msg = NULL;
 221
 222         wpa_dbg(drv->ctx, MSG_DEBUG, "nl80211: scan request");
 223         drv->scan_for_auth = 0;
 224
 225         if (TEST_FAIL())
 226                 return -1;
 227
 228         msg = nl80211_scan_common(bss, NL80211_CMD_TRIGGER_SCAN, params);
 229         if (!msg)
 230                 return -1;
 231
 232         if (params->p2p_probe) {
 233                 struct nlattr *rates;
 234
 235                 wpa_printf(MSG_DEBUG, "nl80211: P2P probe - mask SuppRates");
 236
 237                 rates = nla_nest_start(msg, NL80211_ATTR_SCAN_SUPP_RATES);
 238                 if (rates == NULL)
 239                         goto fail;
 240
 241                 /*
 242                  * Remove 2.4 GHz rates 1, 2, 5.5, 11 Mbps from supported rates
 243                  * by masking out everything else apart from the OFDM rates 6,
 244                  * 9, 12, 18, 24, 36, 48, 54 Mbps from non-MCS rates. All 5 GHz
 245                  * rates are left enabled.
 246                  */
 247                 if (nla_put(msg, NL80211_BAND_2GHZ, 8,
 248                             "\x0c\x12\x18\x24\x30\x48\x60\x6c"))
 249                         goto fail;
 250                 nla_nest_end(msg, rates);
 251
 252                 if (nla_put_flag(msg, NL80211_ATTR_TX_NO_CCK_RATE))
 253                         goto fail;
 254         }
 255
 256         ret = send_and_recv_msgs(drv, msg, NULL, NULL);
 257         msg = NULL;
 258         if (ret) {
 259                 wpa_printf(MSG_DEBUG, "nl80211: Scan trigger failed: ret=%d "
 260                            "(%s)", ret, strerror(-ret));
 261                 if (drv->hostapd && is_ap_interface(drv->nlmode)) {
 262                         enum nl80211_iftype old_mode = drv->nlmode;
 263
 264                         /*
 265                          * mac80211 does not allow scan requests in AP mode, so
 266                          * try to do this in station mode.
 267                          */
 268                         if (wpa_driver_nl80211_set_mode(
 269                                     bss, NL80211_IFTYPE_STATION))
 270                                 goto fail;
 271
 272                         if (wpa_driver_nl80211_scan(bss, params)) {
 273                                 wpa_driver_nl80211_set_mode(bss, old_mode);
 274                                 goto fail;
 275                         }
 276
 277                         /* Restore AP mode when processing scan results */
 278                         drv->ap_scan_as_station = old_mode;
 279                         ret = 0;
 280                 } else
 281                         goto fail;
 282         }
 283
 284         drv->scan_state = SCAN_REQUESTED;
 285         /* Not all drivers generate "scan completed" wireless event, so try to
 286          * read results after a timeout. */
 287         timeout = 10;
 288         if (drv->scan_complete_events) {
 289                 /*
 290                  * The driver seems to deliver events to notify when scan is
 291                  * complete, so use longer timeout to avoid race conditions
 292                  * with scanning and following association request.
 293                  */
 294                 timeout = 30;
 295         }
 296         wpa_printf(MSG_DEBUG, "Scan requested (ret=%d) - scan timeout %d "
 297                    "seconds", ret, timeout);
 298         eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv, drv->ctx);
 299         eloop_register_timeout(timeout, 0, wpa_driver_nl80211_scan_timeout,
 300                                drv, drv->ctx);
 301         drv->last_scan_cmd = NL80211_CMD_TRIGGER_SCAN;
 302
 303 fail:
 304         nlmsg_free(msg);
 305         return ret;
 306 }
 307
 308
 309 /**
 310  * wpa_driver_nl80211_sched_scan - Initiate a scheduled scan
 311  * @priv: Pointer to private driver data from wpa_driver_nl80211_init()
 312  * @params: Scan parameters
 313  * @interval: Interval between scan cycles in milliseconds
 314  * Returns: 0 on success, -1 on failure or if not supported
 315  */
 316 int wpa_driver_nl80211_sched_scan(void *priv,
 317                                   struct wpa_driver_scan_params *params,
 318                                   u32 interval)
 319 {
 320         struct i802_bss *bss = priv;
 321         struct wpa_driver_nl80211_data *drv = bss->drv;
 322         int ret = -1;
 323         struct nl_msg *msg;
 324         size_t i;
 325
 326         wpa_dbg(drv->ctx, MSG_DEBUG, "nl80211: sched_scan request");
 327
 328 #ifdef ANDROID
 329         if (!drv->capa.sched_scan_supported)
 330                 return android_pno_start(bss, params);
 331 #endif /* ANDROID */
 332
 333         msg = nl80211_scan_common(bss, NL80211_CMD_START_SCHED_SCAN, params);
 334         if (!msg ||
 335             nla_put_u32(msg, NL80211_ATTR_SCHED_SCAN_INTERVAL, interval))
 336                 goto fail;
 337
 338         if ((drv->num_filter_ssids &&
 339             (int) drv->num_filter_ssids <= drv->capa.max_match_sets) ||
 340             params->filter_rssi) {
 341                 struct nlattr *match_sets;
 342                 match_sets = nla_nest_start(msg, NL80211_ATTR_SCHED_SCAN_MATCH);
 343                 if (match_sets == NULL)
 344                         goto fail;
 345
 346                 for (i = 0; i < drv->num_filter_ssids; i++) {
 347                         struct nlattr *match_set_ssid;
 348                         wpa_hexdump_ascii(MSG_MSGDUMP,
 349                                           "nl80211: Sched scan filter SSID",
 350                                           drv->filter_ssids[i].ssid,
 351                                           drv->filter_ssids[i].ssid_len);
 352
 353                         match_set_ssid = nla_nest_start(msg, i + 1);
 354                         if (match_set_ssid == NULL ||
 355                             nla_put(msg, NL80211_ATTR_SCHED_SCAN_MATCH_SSID,
 356                                     drv->filter_ssids[i].ssid_len,
 357                                     drv->filter_ssids[i].ssid) ||
 358                             (params->filter_rssi &&
 359                              nla_put_u32(msg,
 360                                          NL80211_SCHED_SCAN_MATCH_ATTR_RSSI,
 361                                          params->filter_rssi)))
 362                                 goto fail;
 363
 364                         nla_nest_end(msg, match_set_ssid);
 365                 }
 366
 367                 /*
 368                  * Due to backward compatibility code, newer kernels treat this
 369                  * matchset (with only an RSSI filter) as the default for all
 370                  * other matchsets, unless it's the only one, in which case the
 371                  * matchset will actually allow all SSIDs above the RSSI.
 372                  */
 373                 if (params->filter_rssi) {
 374                         struct nlattr *match_set_rssi;
 375                         match_set_rssi = nla_nest_start(msg, 0);
 376                         if (match_set_rssi == NULL ||
 377                             nla_put_u32(msg, NL80211_SCHED_SCAN_MATCH_ATTR_RSSI,
 378                                         params->filter_rssi))
 379                                 goto fail;
 380                         wpa_printf(MSG_MSGDUMP,
 381                                    "nl80211: Sched scan RSSI filter %d dBm",
 382                                    params->filter_rssi);
 383                         nla_nest_end(msg, match_set_rssi);
 384                 }
 385
 386                 nla_nest_end(msg, match_sets);
 387         }
 388
 389         ret = send_and_recv_msgs(drv, msg, NULL, NULL);
 390
 391         /* TODO: if we get an error here, we should fall back to normal scan */
 392
 393         msg = NULL;
 394         if (ret) {
 395                 wpa_printf(MSG_DEBUG, "nl80211: Sched scan start failed: "
 396                            "ret=%d (%s)", ret, strerror(-ret));
 397                 goto fail;
 398         }
 399
 400         wpa_printf(MSG_DEBUG, "nl80211: Sched scan requested (ret=%d) - "
 401                    "scan interval %d msec", ret, interval);
 402
 403 fail:
 404         nlmsg_free(msg);
 405         return ret;
 406 }
 407
 408
 409 /**
 410  * wpa_driver_nl80211_stop_sched_scan - Stop a scheduled scan
 411  * @priv: Pointer to private driver data from wpa_driver_nl80211_init()
 412  * Returns: 0 on success, -1 on failure or if not supported
 413  */
 414 int wpa_driver_nl80211_stop_sched_scan(void *priv)
 415 {
 416         struct i802_bss *bss = priv;
 417         struct wpa_driver_nl80211_data *drv = bss->drv;
 418         int ret;
 419         struct nl_msg *msg;
 420
 421 #ifdef ANDROID
 422         if (!drv->capa.sched_scan_supported)
 423                 return android_pno_stop(bss);
 424 #endif /* ANDROID */
 425
 426         msg = nl80211_drv_msg(drv, 0, NL80211_CMD_STOP_SCHED_SCAN);
 427         ret = send_and_recv_msgs(drv, msg, NULL, NULL);
 428         if (ret) {
 429                 wpa_printf(MSG_DEBUG,
 430                            "nl80211: Sched scan stop failed: ret=%d (%s)",
 431                            ret, strerror(-ret));
 432         } else {
 433                 wpa_printf(MSG_DEBUG,
 434                            "nl80211: Sched scan stop sent");
 435         }
 436
 437         return ret;
 438 }
 439
 440
 441 const u8 * nl80211_get_ie(const u8 *ies, size_t ies_len, u8 ie)
 442 {
 443         const u8 *end, *pos;
 444
 445         if (ies == NULL)
 446                 return NULL;
 447
 448         pos = ies;
 449         end = ies + ies_len;
 450
 451         while (end - pos > 1) {
 452                 if (2 + pos[1] > end - pos)
 453                         break;
 454                 if (pos[0] == ie)
 455                         return pos;
 456                 pos += 2 + pos[1];
 457         }
 458
 459         return NULL;
 460 }
 461
 462
 463 static int nl80211_scan_filtered(struct wpa_driver_nl80211_data *drv,
 464                                  const u8 *ie, size_t ie_len)
 465 {
 466         const u8 *ssid;
 467         size_t i;
 468
 469         if (drv->filter_ssids == NULL)
 470                 return 0;
 471
 472         ssid = nl80211_get_ie(ie, ie_len, WLAN_EID_SSID);
 473         if (ssid == NULL)
 474                 return 1;
 475
 476         for (i = 0; i < drv->num_filter_ssids; i++) {
 477                 if (ssid[1] == drv->filter_ssids[i].ssid_len &&
 478                     os_memcmp(ssid + 2, drv->filter_ssids[i].ssid, ssid[1]) ==
 479                     0)
 480                         return 0;
 481         }
 482
 483         return 1;
 484 }
 485
 486
 487 int bss_info_handler(struct nl_msg *msg, void *arg)
 488 {
 489         struct nlattr *tb[NL80211_ATTR_MAX + 1];
 490         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 491         struct nlattr *bss[NL80211_BSS_MAX + 1];
 492         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
 493                 [NL80211_BSS_BSSID] = { .type = NLA_UNSPEC },
 494                 [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
 495                 [NL80211_BSS_TSF] = { .type = NLA_U64 },
 496                 [NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 },
 497                 [NL80211_BSS_CAPABILITY] = { .type = NLA_U16 },
 498                 [NL80211_BSS_INFORMATION_ELEMENTS] = { .type = NLA_UNSPEC },
 499                 [NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
 500                 [NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
 501                 [NL80211_BSS_STATUS] = { .type = NLA_U32 },
 502                 [NL80211_BSS_SEEN_MS_AGO] = { .type = NLA_U32 },
 503                 [NL80211_BSS_BEACON_IES] = { .type = NLA_UNSPEC },
 504         };
 505         struct nl80211_bss_info_arg *_arg = arg;
 506         struct wpa_scan_results *res = _arg->res;
 507         struct wpa_scan_res **tmp;
 508         struct wpa_scan_res *r;
 509         const u8 *ie, *beacon_ie;
 510         size_t ie_len, beacon_ie_len;
 511         u8 *pos;
 512         size_t i;
 513
 514         nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 515                   genlmsg_attrlen(gnlh, 0), NULL);
 516         if (!tb[NL80211_ATTR_BSS])
 517                 return NL_SKIP;
 518         if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
 519                              bss_policy))
 520                 return NL_SKIP;
 521         if (bss[NL80211_BSS_STATUS]) {
 522                 enum nl80211_bss_status status;
 523                 status = nla_get_u32(bss[NL80211_BSS_STATUS]);
 524                 if (status == NL80211_BSS_STATUS_ASSOCIATED &&
 525                     bss[NL80211_BSS_FREQUENCY]) {
 526                         _arg->assoc_freq =
 527                                 nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
 528                         wpa_printf(MSG_DEBUG, "nl80211: Associated on %u MHz",
 529                                    _arg->assoc_freq);
 530                 }
 531                 if (status == NL80211_BSS_STATUS_IBSS_JOINED &&
 532                     bss[NL80211_BSS_FREQUENCY]) {
 533                         _arg->ibss_freq =
 534                                 nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
 535                         wpa_printf(MSG_DEBUG, "nl80211: IBSS-joined on %u MHz",
 536                                    _arg->ibss_freq);
 537                 }
 538                 if (status == NL80211_BSS_STATUS_ASSOCIATED &&
 539                     bss[NL80211_BSS_BSSID]) {
 540                         os_memcpy(_arg->assoc_bssid,
 541                                   nla_data(bss[NL80211_BSS_BSSID]), ETH_ALEN);
 542                         wpa_printf(MSG_DEBUG, "nl80211: Associated with "
 543                                    MACSTR, MAC2STR(_arg->assoc_bssid));
 544                 }
 545         }
 546         if (!res)
 547                 return NL_SKIP;
 548         if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) {
 549                 ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
 550                 ie_len = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
 551         } else {
 552                 ie = NULL;
 553                 ie_len = 0;
 554         }
 555         if (bss[NL80211_BSS_BEACON_IES]) {
 556                 beacon_ie = nla_data(bss[NL80211_BSS_BEACON_IES]);
 557                 beacon_ie_len = nla_len(bss[NL80211_BSS_BEACON_IES]);
 558         } else {
 559                 beacon_ie = NULL;
 560                 beacon_ie_len = 0;
 561         }
 562
 563         if (nl80211_scan_filtered(_arg->drv, ie ? ie : beacon_ie,
 564                                   ie ? ie_len : beacon_ie_len))
 565                 return NL_SKIP;
 566
 567         r = os_zalloc(sizeof(*r) + ie_len + beacon_ie_len);
 568         if (r == NULL)
 569                 return NL_SKIP;
 570         if (bss[NL80211_BSS_BSSID])
 571                 os_memcpy(r->bssid, nla_data(bss[NL80211_BSS_BSSID]),
 572                           ETH_ALEN);
 573         if (bss[NL80211_BSS_FREQUENCY])
 574                 r->freq = nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
 575         if (bss[NL80211_BSS_BEACON_INTERVAL])
 576                 r->beacon_int = nla_get_u16(bss[NL80211_BSS_BEACON_INTERVAL]);
 577         if (bss[NL80211_BSS_CAPABILITY])
 578                 r->caps = nla_get_u16(bss[NL80211_BSS_CAPABILITY]);
 579         r->flags |= WPA_SCAN_NOISE_INVALID;
 580         if (bss[NL80211_BSS_SIGNAL_MBM]) {
 581                 r->level = nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]);
 582                 r->level /= 100; /* mBm to dBm */
 583                 r->flags |= WPA_SCAN_LEVEL_DBM | WPA_SCAN_QUAL_INVALID;
 584         } else if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
 585                 r->level = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
 586                 r->flags |= WPA_SCAN_QUAL_INVALID;
 587         } else
 588                 r->flags |= WPA_SCAN_LEVEL_INVALID | WPA_SCAN_QUAL_INVALID;
 589         if (bss[NL80211_BSS_TSF])
 590                 r->tsf = nla_get_u64(bss[NL80211_BSS_TSF]);
 591         if (bss[NL80211_BSS_BEACON_TSF]) {
 592                 u64 tsf = nla_get_u64(bss[NL80211_BSS_BEACON_TSF]);
 593                 if (tsf > r->tsf)
 594                         r->tsf = tsf;
 595         }
 596         if (bss[NL80211_BSS_SEEN_MS_AGO])
 597                 r->age = nla_get_u32(bss[NL80211_BSS_SEEN_MS_AGO]);
 598         r->ie_len = ie_len;
 599         pos = (u8 *) (r + 1);
 600         if (ie) {
 601                 os_memcpy(pos, ie, ie_len);
 602                 pos += ie_len;
 603         }
 604         r->beacon_ie_len = beacon_ie_len;
 605         if (beacon_ie)
 606                 os_memcpy(pos, beacon_ie, beacon_ie_len);
 607
 608         if (bss[NL80211_BSS_STATUS]) {
 609                 enum nl80211_bss_status status;
 610                 status = nla_get_u32(bss[NL80211_BSS_STATUS]);
 611                 switch (status) {
 612                 case NL80211_BSS_STATUS_ASSOCIATED:
 613                         r->flags |= WPA_SCAN_ASSOCIATED;
 614                         break;
 615                 default:
 616                         break;
 617                 }
 618         }
 619
 620         /*
 621          * cfg80211 maintains separate BSS table entries for APs if the same
 622          * BSSID,SSID pair is seen on multiple channels. wpa_supplicant does
 623          * not use frequency as a separate key in the BSS table, so filter out
 624          * duplicated entries. Prefer associated BSS entry in such a case in
 625          * order to get the correct frequency into the BSS table. Similarly,
 626          * prefer newer entries over older.
 627          */
 628         for (i = 0; i < res->num; i++) {
 629                 const u8 *s1, *s2;
 630                 if (os_memcmp(res->res[i]->bssid, r->bssid, ETH_ALEN) != 0)
 631                         continue;
 632
 633                 s1 = nl80211_get_ie((u8 *) (res->res[i] + 1),
 634                                     res->res[i]->ie_len, WLAN_EID_SSID);
 635                 s2 = nl80211_get_ie((u8 *) (r + 1), r->ie_len, WLAN_EID_SSID);
 636                 if (s1 == NULL || s2 == NULL || s1[1] != s2[1] ||
 637                     os_memcmp(s1, s2, 2 + s1[1]) != 0)
 638                         continue;
 639
 640                 /* Same BSSID,SSID was already included in scan results */
 641                 wpa_printf(MSG_DEBUG, "nl80211: Remove duplicated scan result "
 642                            "for " MACSTR, MAC2STR(r->bssid));
 643
 644                 if (((r->flags & WPA_SCAN_ASSOCIATED) &&
 645                      !(res->res[i]->flags & WPA_SCAN_ASSOCIATED)) ||
 646                     r->age < res->res[i]->age) {
 647                         os_free(res->res[i]);
 648                         res->res[i] = r;
 649                 } else
 650                         os_free(r);
 651                 return NL_SKIP;
 652         }
 653
 654         tmp = os_realloc_array(res->res, res->num + 1,
 655                                sizeof(struct wpa_scan_res *));
 656         if (tmp == NULL) {
 657                 os_free(r);
 658                 return NL_SKIP;
 659         }
 660         tmp[res->num++] = r;
 661         res->res = tmp;
 662
 663         return NL_SKIP;
 664 }
 665
 666
 667 static void clear_state_mismatch(struct wpa_driver_nl80211_data *drv,
 668                                  const u8 *addr)
 669 {
 670         if (drv->capa.flags & WPA_DRIVER_FLAGS_SME) {
 671                 wpa_printf(MSG_DEBUG, "nl80211: Clear possible state "
 672                            "mismatch (" MACSTR ")", MAC2STR(addr));
 673                 wpa_driver_nl80211_mlme(drv, addr,
 674                                         NL80211_CMD_DEAUTHENTICATE,
 675                                         WLAN_REASON_PREV_AUTH_NOT_VALID, 1);
 676         }
 677 }
 678
 679
 680 static void wpa_driver_nl80211_check_bss_status(
 681         struct wpa_driver_nl80211_data *drv, struct wpa_scan_results *res)
 682 {
 683         size_t i;
 684
 685         for (i = 0; i < res->num; i++) {
 686                 struct wpa_scan_res *r = res->res[i];
 687
 688                 if (r->flags & WPA_SCAN_ASSOCIATED) {
 689                         wpa_printf(MSG_DEBUG, "nl80211: Scan results "
 690                                    "indicate BSS status with " MACSTR
 691                                    " as associated",
 692                                    MAC2STR(r->bssid));
 693                         if (is_sta_interface(drv->nlmode) &&
 694                             !drv->associated) {
 695                                 wpa_printf(MSG_DEBUG, "nl80211: Local state "
 696                                            "(not associated) does not match "
 697                                            "with BSS state");
 698                                 clear_state_mismatch(drv, r->bssid);
 699                         } else if (is_sta_interface(drv->nlmode) &&
 700                                    os_memcmp(drv->bssid, r->bssid, ETH_ALEN) !=
 701                                    0) {
 702                                 wpa_printf(MSG_DEBUG, "nl80211: Local state "
 703                                            "(associated with " MACSTR ") does "
 704                                            "not match with BSS state",
 705                                            MAC2STR(drv->bssid));
 706                                 clear_state_mismatch(drv, r->bssid);
 707                                 clear_state_mismatch(drv, drv->bssid);
 708                         }
 709                 }
 710         }
 711 }
 712
 713
 714 static struct wpa_scan_results *
 715 nl80211_get_scan_results(struct wpa_driver_nl80211_data *drv)
 716 {
 717         struct nl_msg *msg;
 718         struct wpa_scan_results *res;
 719         int ret;
 720         struct nl80211_bss_info_arg arg;
 721
 722         res = os_zalloc(sizeof(*res));
 723         if (res == NULL)
 724                 return NULL;
 725         if (!(msg = nl80211_cmd_msg(drv->first_bss, NLM_F_DUMP,
 726                                     NL80211_CMD_GET_SCAN))) {
 727                 wpa_scan_results_free(res);
 728                 return NULL;
 729         }
 730
 731         arg.drv = drv;
 732         arg.res = res;
 733         ret = send_and_recv_msgs(drv, msg, bss_info_handler, &arg);
 734         if (ret == 0) {
 735                 wpa_printf(MSG_DEBUG, "nl80211: Received scan results (%lu "
 736                            "BSSes)", (unsigned long) res->num);
 737                 nl80211_get_noise_for_scan_results(drv, res);
 738                 return res;
 739         }
 740         wpa_printf(MSG_DEBUG, "nl80211: Scan result fetch failed: ret=%d "
 741                    "(%s)", ret, strerror(-ret));
 742         wpa_scan_results_free(res);
 743         return NULL;
 744 }
 745
 746
 747 /**
 748  * wpa_driver_nl80211_get_scan_results - Fetch the latest scan results
 749  * @priv: Pointer to private wext data from wpa_driver_nl80211_init()
 750  * Returns: Scan results on success, -1 on failure
 751  */
 752 struct wpa_scan_results * wpa_driver_nl80211_get_scan_results(void *priv)
 753 {
 754         struct i802_bss *bss = priv;
 755         struct wpa_driver_nl80211_data *drv = bss->drv;
 756         struct wpa_scan_results *res;
 757
 758         res = nl80211_get_scan_results(drv);
 759         if (res)
 760                 wpa_driver_nl80211_check_bss_status(drv, res);
 761         return res;
 762 }
 763
 764
 765 void nl80211_dump_scan(struct wpa_driver_nl80211_data *drv)
 766 {
 767         struct wpa_scan_results *res;
 768         size_t i;
 769
 770         res = nl80211_get_scan_results(drv);
 771         if (res == NULL) {
 772                 wpa_printf(MSG_DEBUG, "nl80211: Failed to get scan results");
 773                 return;
 774         }
 775
 776         wpa_printf(MSG_DEBUG, "nl80211: Scan result dump");
 777         for (i = 0; i < res->num; i++) {
 778                 struct wpa_scan_res *r = res->res[i];
 779                 wpa_printf(MSG_DEBUG, "nl80211: %d/%d " MACSTR "%s",
 780                            (int) i, (int) res->num, MAC2STR(r->bssid),
 781                            r->flags & WPA_SCAN_ASSOCIATED ? " [assoc]" : "");
 782         }
 783
 784         wpa_scan_results_free(res);
 785 }
 786
 787
 788 #ifdef CONFIG_DRIVER_NL80211_QCA
 789
 790 static int scan_cookie_handler(struct nl_msg *msg, void *arg)
 791 {
 792         struct nlattr *tb[NL80211_ATTR_MAX + 1];
 793         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 794         u64 *cookie = arg;
 795
 796         nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 797                   genlmsg_attrlen(gnlh, 0), NULL);
 798
 799         if (tb[NL80211_ATTR_VENDOR_DATA]) {
 800                 struct nlattr *nl_vendor = tb[NL80211_ATTR_VENDOR_DATA];
 801                 struct nlattr *tb_vendor[QCA_WLAN_VENDOR_ATTR_SCAN_MAX + 1];
 802
 803                 nla_parse(tb_vendor, QCA_WLAN_VENDOR_ATTR_SCAN_MAX,
 804                           nla_data(nl_vendor), nla_len(nl_vendor), NULL);
 805
 806                 if (tb_vendor[QCA_WLAN_VENDOR_ATTR_SCAN_COOKIE])
 807                         *cookie = nla_get_u64(
 808                                 tb_vendor[QCA_WLAN_VENDOR_ATTR_SCAN_COOKIE]);
 809         }
 810
 811         return NL_SKIP;
 812 }
 813
 814
 815 /**
 816  * wpa_driver_nl80211_vendor_scan - Request the driver to initiate a vendor scan
 817  * @bss: Pointer to private driver data from wpa_driver_nl80211_init()
 818  * @params: Scan parameters
 819  * Returns: 0 on success, -1 on failure
 820  */
 821 int wpa_driver_nl80211_vendor_scan(struct i802_bss *bss,
 822                                    struct wpa_driver_scan_params *params)
 823 {
 824         struct wpa_driver_nl80211_data *drv = bss->drv;
 825         struct nl_msg *msg = NULL;
 826         struct nlattr *attr;
 827         size_t i;
 828         u32 scan_flags = 0;
 829         int ret = -1;
 830         u64 cookie = 0;
 831
 832         wpa_dbg(drv->ctx, MSG_DEBUG, "nl80211: vendor scan request");
 833         drv->scan_for_auth = 0;
 834
 835         if (!(msg = nl80211_drv_msg(drv, 0, NL80211_CMD_VENDOR)) ||
 836             nla_put_u32(msg, NL80211_ATTR_VENDOR_ID, OUI_QCA) ||
 837             nla_put_u32(msg, NL80211_ATTR_VENDOR_SUBCMD,
 838                         QCA_NL80211_VENDOR_SUBCMD_TRIGGER_SCAN) )
 839                 goto fail;
 840
 841         attr = nla_nest_start(msg, NL80211_ATTR_VENDOR_DATA);
 842         if (attr == NULL)
 843                 goto fail;
 844
 845         if (params->num_ssids) {
 846                 struct nlattr *ssids;
 847
 848                 ssids = nla_nest_start(msg, QCA_WLAN_VENDOR_ATTR_SCAN_SSIDS);
 849                 if (ssids == NULL)
 850                         goto fail;
 851                 for (i = 0; i < params->num_ssids; i++) {
 852                         wpa_hexdump_ascii(MSG_MSGDUMP, "nl80211: Scan SSID",
 853                                         params->ssids[i].ssid,
 854                                         params->ssids[i].ssid_len);
 855                         if (nla_put(msg, i + 1, params->ssids[i].ssid_len,
 856                                     params->ssids[i].ssid))
 857                                 goto fail;
 858                 }
 859                 nla_nest_end(msg, ssids);
 860         }
 861
 862         if (params->extra_ies) {
 863                 wpa_hexdump(MSG_MSGDUMP, "nl80211: Scan extra IEs",
 864                             params->extra_ies, params->extra_ies_len);
 865                 if (nla_put(msg, QCA_WLAN_VENDOR_ATTR_SCAN_IE,
 866                             params->extra_ies_len, params->extra_ies))
 867                         goto fail;
 868         }
 869
 870         if (params->freqs) {
 871                 struct nlattr *freqs;
 872
 873                 freqs = nla_nest_start(msg,
 874                                        QCA_WLAN_VENDOR_ATTR_SCAN_FREQUENCIES);
 875                 if (freqs == NULL)
 876                         goto fail;
 877                 for (i = 0; params->freqs[i]; i++) {
 878                         wpa_printf(MSG_MSGDUMP,
 879                                    "nl80211: Scan frequency %u MHz",
 880                                    params->freqs[i]);
 881                         if (nla_put_u32(msg, i + 1, params->freqs[i]))
 882                                 goto fail;
 883                 }
 884                 nla_nest_end(msg, freqs);
 885         }
 886
 887         os_free(drv->filter_ssids);
 888         drv->filter_ssids = params->filter_ssids;
 889         params->filter_ssids = NULL;
 890         drv->num_filter_ssids = params->num_filter_ssids;
 891
 892         if (params->low_priority && drv->have_low_prio_scan) {
 893                 wpa_printf(MSG_DEBUG,
 894                            "nl80211: Add NL80211_SCAN_FLAG_LOW_PRIORITY");
 895                 scan_flags |= NL80211_SCAN_FLAG_LOW_PRIORITY;
 896         }
 897
 898         if (params->mac_addr_rand) {
 899                 wpa_printf(MSG_DEBUG,
 900                            "nl80211: Add NL80211_SCAN_FLAG_RANDOM_ADDR");
 901                 scan_flags |= NL80211_SCAN_FLAG_RANDOM_ADDR;
 902
 903                 if (params->mac_addr) {
 904                         wpa_printf(MSG_DEBUG, "nl80211: MAC address: " MACSTR,
 905                                    MAC2STR(params->mac_addr));
 906                         if (nla_put(msg, QCA_WLAN_VENDOR_ATTR_SCAN_MAC,
 907                                     ETH_ALEN, params->mac_addr))
 908                                 goto fail;
 909                 }
 910
 911                 if (params->mac_addr_mask) {
 912                         wpa_printf(MSG_DEBUG, "nl80211: MAC address mask: "
 913                                    MACSTR, MAC2STR(params->mac_addr_mask));
 914                         if (nla_put(msg, QCA_WLAN_VENDOR_ATTR_SCAN_MAC_MASK,
 915                                     ETH_ALEN, params->mac_addr_mask))
 916                                 goto fail;
 917                 }
 918         }
 919
 920         if (scan_flags &&
 921             nla_put_u32(msg, NL80211_ATTR_SCAN_FLAGS, scan_flags))
 922                 goto fail;
 923
 924         if (params->p2p_probe) {
 925                 struct nlattr *rates;
 926
 927                 wpa_printf(MSG_DEBUG, "nl80211: P2P probe - mask SuppRates");
 928
 929                 rates = nla_nest_start(msg,
 930                                        QCA_WLAN_VENDOR_ATTR_SCAN_SUPP_RATES);
 931                 if (rates == NULL)
 932                         goto fail;
 933
 934                 /*
 935                  * Remove 2.4 GHz rates 1, 2, 5.5, 11 Mbps from supported rates
 936                  * by masking out everything else apart from the OFDM rates 6,
 937                  * 9, 12, 18, 24, 36, 48, 54 Mbps from non-MCS rates. All 5 GHz
 938                  * rates are left enabled.
 939                  */
 940                 if (nla_put(msg, NL80211_BAND_2GHZ, 8,
 941                             "\x0c\x12\x18\x24\x30\x48\x60\x6c"))
 942                         goto fail;
 943                 nla_nest_end(msg, rates);
 944
 945                 if (nla_put_flag(msg, QCA_WLAN_VENDOR_ATTR_SCAN_TX_NO_CCK_RATE))
 946                         goto fail;
 947         }
 948
 949         nla_nest_end(msg, attr);
 950
 951         ret = send_and_recv_msgs(drv, msg, scan_cookie_handler, &cookie);
 952         msg = NULL;
 953         if (ret) {
 954                 wpa_printf(MSG_DEBUG,
 955                            "nl80211: Vendor scan trigger failed: ret=%d (%s)",
 956                            ret, strerror(-ret));
 957                 goto fail;
 958         }
 959
 960         drv->vendor_scan_cookie = cookie;
 961         drv->scan_state = SCAN_REQUESTED;
 962
 963         wpa_printf(MSG_DEBUG,
 964                    "nl80211: Vendor scan requested (ret=%d) - scan timeout 30 seconds, scan cookie:0x%llx",
 965                    ret, (long long unsigned int) cookie);
 966         eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv, drv->ctx);
 967         eloop_register_timeout(30, 0, wpa_driver_nl80211_scan_timeout,
 968                                drv, drv->ctx);
 969         drv->last_scan_cmd = NL80211_CMD_VENDOR;
 970
 971 fail:
 972         nlmsg_free(msg);
 973         return ret;
 974 }
 975
 976 #endif /* CONFIG_DRIVER_NL80211_QCA */