iwinfo_nl80211.c

   1 /*
   2  * iwinfo - Wireless Information Library - NL80211 Backend
   3  *
   4  *   Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
   5  *
   6  * The iwinfo library is free software: you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * The iwinfo library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with the iwinfo library. If not, see http://www.gnu.org/licenses/.
  17  *
  18  * The signal handling code is derived from the official madwifi tools,
  19  * wlanconfig.c in particular. The encryption property handling was
  20  * inspired by the hostapd madwifi driver.
  21  *
  22  * Parts of this code are derived from the Linux iw utility.
  23  */
  24
  25 #include <limits.h>
  26 #include <glob.h>
  27 #include <fnmatch.h>
  28 #include <stdarg.h>
  29
  30 #include "iwinfo_nl80211.h"
  31
  32 #define min(x, y) ((x) < (y)) ? (x) : (y)
  33
  34 #define BIT(x) (1ULL<<(x))
  35
  36 static struct nl80211_state *nls = NULL;
  37
  38 static void nl80211_close(void)
  39 {
  40         if (nls)
  41         {
  42                 if (nls->nlctrl)
  43                         genl_family_put(nls->nlctrl);
  44
  45                 if (nls->nl80211)
  46                         genl_family_put(nls->nl80211);
  47
  48                 if (nls->nl_sock)
  49                         nl_socket_free(nls->nl_sock);
  50
  51                 if (nls->nl_cache)
  52                         nl_cache_free(nls->nl_cache);
  53
  54                 free(nls);
  55                 nls = NULL;
  56         }
  57 }
  58
  59 static int nl80211_init(void)
  60 {
  61         int err, fd;
  62
  63         if (!nls)
  64         {
  65                 nls = malloc(sizeof(struct nl80211_state));
  66                 if (!nls) {
  67                         err = -ENOMEM;
  68                         goto err;
  69                 }
  70
  71                 memset(nls, 0, sizeof(*nls));
  72
  73                 nls->nl_sock = nl_socket_alloc();
  74                 if (!nls->nl_sock) {
  75                         err = -ENOMEM;
  76                         goto err;
  77                 }
  78
  79                 if (genl_connect(nls->nl_sock)) {
  80                         err = -ENOLINK;
  81                         goto err;
  82                 }
  83
  84                 fd = nl_socket_get_fd(nls->nl_sock);
  85                 if (fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC) < 0) {
  86                         err = -EINVAL;
  87                         goto err;
  88                 }
  89
  90                 if (genl_ctrl_alloc_cache(nls->nl_sock, &nls->nl_cache)) {
  91                         err = -ENOMEM;
  92                         goto err;
  93                 }
  94
  95                 nls->nl80211 = genl_ctrl_search_by_name(nls->nl_cache, "nl80211");
  96                 if (!nls->nl80211) {
  97                         err = -ENOENT;
  98                         goto err;
  99                 }
 100
 101                 nls->nlctrl = genl_ctrl_search_by_name(nls->nl_cache, "nlctrl");
 102                 if (!nls->nlctrl) {
 103                         err = -ENOENT;
 104                         goto err;
 105                 }
 106         }
 107
 108         return 0;
 109
 110
 111 err:
 112         nl80211_close();
 113         return err;
 114 }
 115
 116 static int nl80211_readint(const char *path)
 117 {
 118         int fd;
 119         int rv = -1;
 120         char buffer[16];
 121
 122         if ((fd = open(path, O_RDONLY)) > -1)
 123         {
 124                 if (read(fd, buffer, sizeof(buffer)) > 0)
 125                         rv = atoi(buffer);
 126
 127                 close(fd);
 128         }
 129
 130         return rv;
 131 }
 132
 133 static int nl80211_readstr(const char *path, char *buffer, int length)
 134 {
 135         int fd;
 136         int rv = -1;
 137
 138         if ((fd = open(path, O_RDONLY)) > -1)
 139         {
 140                 if ((rv = read(fd, buffer, length - 1)) > 0)
 141                 {
 142                         if (buffer[rv - 1] == '\n')
 143                                 rv--;
 144
 145                         buffer[rv] = 0;
 146                 }
 147
 148                 close(fd);
 149         }
 150
 151         return rv;
 152 }
 153
 154
 155 static int nl80211_msg_error(struct sockaddr_nl *nla,
 156         struct nlmsgerr *err, void *arg)
 157 {
 158         int *ret = arg;
 159         *ret = err->error;
 160         return NL_STOP;
 161 }
 162
 163 static int nl80211_msg_finish(struct nl_msg *msg, void *arg)
 164 {
 165         int *ret = arg;
 166         *ret = 0;
 167         return NL_SKIP;
 168 }
 169
 170 static int nl80211_msg_ack(struct nl_msg *msg, void *arg)
 171 {
 172         int *ret = arg;
 173         *ret = 0;
 174         return NL_STOP;
 175 }
 176
 177 static int nl80211_msg_response(struct nl_msg *msg, void *arg)
 178 {
 179         return NL_SKIP;
 180 }
 181
 182 static void nl80211_free(struct nl80211_msg_conveyor *cv)
 183 {
 184         if (cv)
 185         {
 186                 if (cv->cb)
 187                         nl_cb_put(cv->cb);
 188
 189                 if (cv->msg)
 190                         nlmsg_free(cv->msg);
 191
 192                 cv->cb  = NULL;
 193                 cv->msg = NULL;
 194         }
 195 }
 196
 197 static struct nl80211_msg_conveyor * nl80211_new(struct genl_family *family,
 198                                                  int cmd, int flags)
 199 {
 200         static struct nl80211_msg_conveyor cv;
 201
 202         struct nl_msg *req = NULL;
 203         struct nl_cb *cb = NULL;
 204
 205         req = nlmsg_alloc();
 206         if (!req)
 207                 goto err;
 208
 209         cb = nl_cb_alloc(NL_CB_DEFAULT);
 210         if (!cb)
 211                 goto err;
 212
 213         genlmsg_put(req, 0, 0, genl_family_get_id(family), 0, flags, cmd, 0);
 214
 215         cv.msg = req;
 216         cv.cb  = cb;
 217
 218         return &cv;
 219
 220 err:
 221         if (req)
 222                 nlmsg_free(req);
 223
 224         return NULL;
 225 }
 226
 227 static struct nl80211_msg_conveyor * nl80211_ctl(int cmd, int flags)
 228 {
 229         if (nl80211_init() < 0)
 230                 return NULL;
 231
 232         return nl80211_new(nls->nlctrl, cmd, flags);
 233 }
 234
 235 static int nl80211_phy_idx_from_uci_path(struct uci_section *s)
 236 {
 237         const char *opt;
 238         char buf[128];
 239         int idx = -1;
 240         glob_t gl;
 241
 242         opt = uci_lookup_option_string(uci_ctx, s, "path");
 243         if (!opt)
 244                 return -1;
 245
 246         snprintf(buf, sizeof(buf), "/sys/devices/%s/ieee80211/*/index", opt);  /**/
 247         if (glob(buf, 0, NULL, &gl))
 248                 snprintf(buf, sizeof(buf), "/sys/devices/platform/%s/ieee80211/*/index", opt);  /**/
 249
 250         if (glob(buf, 0, NULL, &gl))
 251                 return -1;
 252
 253         if (gl.gl_pathc > 0)
 254                 idx = nl80211_readint(gl.gl_pathv[0]);
 255
 256         globfree(&gl);
 257
 258         return idx;
 259 }
 260
 261 static int nl80211_phy_idx_from_uci_macaddr(struct uci_section *s)
 262 {
 263         const char *opt;
 264         char buf[128];
 265         int i, idx = -1;
 266         glob_t gl;
 267
 268         opt = uci_lookup_option_string(uci_ctx, s, "macaddr");
 269         if (!opt)
 270                 return -1;
 271
 272         snprintf(buf, sizeof(buf), "/sys/class/ieee80211/*");   /**/
 273         if (glob(buf, 0, NULL, &gl))
 274                 return -1;
 275
 276         for (i = 0; i < gl.gl_pathc; i++)
 277         {
 278                 snprintf(buf, sizeof(buf), "%s/macaddress", gl.gl_pathv[i]);
 279                 if (nl80211_readstr(buf, buf, sizeof(buf)) <= 0)
 280                         continue;
 281
 282                 if (fnmatch(opt, buf, FNM_CASEFOLD))
 283                         continue;
 284
 285                 snprintf(buf, sizeof(buf), "%s/index", gl.gl_pathv[i]);
 286                 if ((idx = nl80211_readint(buf)) > -1)
 287                         break;
 288         }
 289
 290         globfree(&gl);
 291
 292         return idx;
 293 }
 294
 295 static int nl80211_phy_idx_from_uci_phy(struct uci_section *s)
 296 {
 297         const char *opt;
 298         char buf[128];
 299
 300         opt = uci_lookup_option_string(uci_ctx, s, "phy");
 301         if (!opt)
 302                 return -1;
 303
 304         snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/index", opt);
 305         return nl80211_readint(buf);
 306 }
 307
 308 static int nl80211_phy_idx_from_uci(const char *name)
 309 {
 310         struct uci_section *s;
 311         int idx = -1;
 312
 313         s = iwinfo_uci_get_radio(name, "mac80211");
 314         if (!s)
 315                 goto free;
 316
 317         idx = nl80211_phy_idx_from_uci_path(s);
 318
 319         if (idx < 0)
 320                 idx = nl80211_phy_idx_from_uci_macaddr(s);
 321
 322         if (idx < 0)
 323                 idx = nl80211_phy_idx_from_uci_phy(s);
 324
 325 free:
 326         iwinfo_uci_free();
 327         return idx;
 328 }
 329
 330 static struct nl80211_msg_conveyor * nl80211_msg(const char *ifname,
 331                                                  int cmd, int flags)
 332 {
 333         int ifidx = -1, phyidx = -1;
 334         struct nl80211_msg_conveyor *cv;
 335
 336         if (ifname == NULL)
 337                 return NULL;
 338
 339         if (nl80211_init() < 0)
 340                 return NULL;
 341
 342         if (!strncmp(ifname, "phy", 3))
 343                 phyidx = atoi(&ifname[3]);
 344         else if (!strncmp(ifname, "radio", 5))
 345                 phyidx = nl80211_phy_idx_from_uci(ifname);
 346         else if (!strncmp(ifname, "mon.", 4))
 347                 ifidx = if_nametoindex(&ifname[4]);
 348         else
 349                 ifidx = if_nametoindex(ifname);
 350
 351         /* Valid ifidx must be greater than 0 */
 352         if ((ifidx <= 0) && (phyidx < 0))
 353                 return NULL;
 354
 355         cv = nl80211_new(nls->nl80211, cmd, flags);
 356         if (!cv)
 357                 return NULL;
 358
 359         if (ifidx > -1)
 360                 NLA_PUT_U32(cv->msg, NL80211_ATTR_IFINDEX, ifidx);
 361
 362         if (phyidx > -1)
 363                 NLA_PUT_U32(cv->msg, NL80211_ATTR_WIPHY, phyidx);
 364
 365         return cv;
 366
 367 nla_put_failure:
 368         nl80211_free(cv);
 369         return NULL;
 370 }
 371
 372 static int nl80211_send(struct nl80211_msg_conveyor *cv,
 373                         int (*cb_func)(struct nl_msg *, void *),
 374                         void *cb_arg)
 375 {
 376         static struct nl80211_msg_conveyor rcv;
 377         int err;
 378
 379         if (cb_func)
 380                 nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, cb_func, cb_arg);
 381         else
 382                 nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, nl80211_msg_response, &rcv);
 383
 384         err = nl_send_auto_complete(nls->nl_sock, cv->msg);
 385
 386         if (err < 0)
 387                 goto out;
 388
 389         err = 1;
 390
 391         nl_cb_err(cv->cb,               NL_CB_CUSTOM, nl80211_msg_error,  &err);
 392         nl_cb_set(cv->cb, NL_CB_FINISH, NL_CB_CUSTOM, nl80211_msg_finish, &err);
 393         nl_cb_set(cv->cb, NL_CB_ACK,    NL_CB_CUSTOM, nl80211_msg_ack,    &err);
 394
 395         while (err > 0)
 396                 nl_recvmsgs(nls->nl_sock, cv->cb);
 397
 398 out:
 399         nl80211_free(cv);
 400         return err;
 401 }
 402
 403 static int nl80211_request(const char *ifname, int cmd, int flags,
 404                            int (*cb_func)(struct nl_msg *, void *),
 405                            void *cb_arg)
 406 {
 407         struct nl80211_msg_conveyor *cv;
 408
 409         cv = nl80211_msg(ifname, cmd, flags);
 410
 411         if (!cv)
 412                 return -ENOMEM;
 413
 414         return nl80211_send(cv, cb_func, cb_arg);
 415 }
 416
 417 static struct nlattr ** nl80211_parse(struct nl_msg *msg)
 418 {
 419         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 420         static struct nlattr *attr[NL80211_ATTR_MAX + 1];
 421
 422         nla_parse(attr, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 423                   genlmsg_attrlen(gnlh, 0), NULL);
 424
 425         return attr;
 426 }
 427
 428 static int nl80211_get_protocol_features_cb(struct nl_msg *msg, void *arg)
 429 {
 430         uint32_t *features = arg;
 431         struct nlattr **attr = nl80211_parse(msg);
 432
 433         if (attr[NL80211_ATTR_PROTOCOL_FEATURES])
 434                 *features = nla_get_u32(attr[NL80211_ATTR_PROTOCOL_FEATURES]);
 435
 436         return NL_SKIP;
 437 }
 438
 439 static int nl80211_get_protocol_features(const char *ifname)
 440 {
 441         struct nl80211_msg_conveyor *req;
 442         uint32_t features = 0;
 443
 444         req = nl80211_msg(ifname, NL80211_CMD_GET_PROTOCOL_FEATURES, 0);
 445         if (req) {
 446                 nl80211_send(req, nl80211_get_protocol_features_cb, &features);
 447                 nl80211_free(req);
 448         }
 449
 450         return features;
 451 }
 452
 453 static int nl80211_subscribe_cb(struct nl_msg *msg, void *arg)
 454 {
 455         struct nl80211_group_conveyor *cv = arg;
 456
 457         struct nlattr **attr = nl80211_parse(msg);
 458         struct nlattr *mgrpinfo[CTRL_ATTR_MCAST_GRP_MAX + 1];
 459         struct nlattr *mgrp;
 460         int mgrpidx;
 461
 462         if (!attr[CTRL_ATTR_MCAST_GROUPS])
 463                 return NL_SKIP;
 464
 465         nla_for_each_nested(mgrp, attr[CTRL_ATTR_MCAST_GROUPS], mgrpidx)
 466         {
 467                 nla_parse(mgrpinfo, CTRL_ATTR_MCAST_GRP_MAX,
 468                           nla_data(mgrp), nla_len(mgrp), NULL);
 469
 470                 if (mgrpinfo[CTRL_ATTR_MCAST_GRP_ID] &&
 471                     mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME] &&
 472                     !strncmp(nla_data(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME]),
 473                              cv->name, nla_len(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME])))
 474                 {
 475                         cv->id = nla_get_u32(mgrpinfo[CTRL_ATTR_MCAST_GRP_ID]);
 476                         break;
 477                 }
 478         }
 479
 480         return NL_SKIP;
 481 }
 482
 483 static int nl80211_subscribe(const char *family, const char *group)
 484 {
 485         struct nl80211_group_conveyor cv = { .name = group, .id = -ENOENT };
 486         struct nl80211_msg_conveyor *req;
 487         int err;
 488
 489         req = nl80211_ctl(CTRL_CMD_GETFAMILY, 0);
 490         if (req)
 491         {
 492                 NLA_PUT_STRING(req->msg, CTRL_ATTR_FAMILY_NAME, family);
 493                 err = nl80211_send(req, nl80211_subscribe_cb, &cv);
 494
 495                 if (err)
 496                         return err;
 497
 498                 return nl_socket_add_membership(nls->nl_sock, cv.id);
 499
 500 nla_put_failure:
 501                 nl80211_free(req);
 502         }
 503
 504         return -ENOMEM;
 505 }
 506
 507
 508 static int nl80211_wait_cb(struct nl_msg *msg, void *arg)
 509 {
 510         struct nl80211_event_conveyor *cv = arg;
 511         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 512
 513         if (cv->wait[gnlh->cmd / 32] & (1 << (gnlh->cmd % 32)))
 514                 cv->recv = gnlh->cmd;
 515
 516         return NL_SKIP;
 517 }
 518
 519 static int nl80211_wait_seq_check(struct nl_msg *msg, void *arg)
 520 {
 521         return NL_OK;
 522 }
 523
 524 static int __nl80211_wait(const char *family, const char *group, ...)
 525 {
 526         struct nl80211_event_conveyor cv = { };
 527         struct nl_cb *cb;
 528         int err = 0;
 529         int cmd;
 530         va_list ap;
 531
 532         if (nl80211_subscribe(family, group))
 533                 return -ENOENT;
 534
 535         cb = nl_cb_alloc(NL_CB_DEFAULT);
 536
 537         if (!cb)
 538                 return -ENOMEM;
 539
 540         nl_cb_err(cb,                  NL_CB_CUSTOM, nl80211_msg_error,      &err);
 541         nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, nl80211_wait_seq_check, NULL);
 542         nl_cb_set(cb, NL_CB_VALID,     NL_CB_CUSTOM, nl80211_wait_cb,        &cv );
 543
 544         va_start(ap, group);
 545
 546         for (cmd = va_arg(ap, int); cmd != 0; cmd = va_arg(ap, int))
 547                 cv.wait[cmd / 32] |= (1 << (cmd % 32));
 548
 549         va_end(ap);
 550
 551         while (!cv.recv && !err)
 552                 nl_recvmsgs(nls->nl_sock, cb);
 553
 554         nl_cb_put(cb);
 555
 556         return err;
 557 }
 558
 559 #define nl80211_wait(family, group, ...) \
 560         __nl80211_wait(family, group, __VA_ARGS__, 0)
 561
 562
 563 static int nl80211_freq2channel(int freq)
 564 {
 565         if (freq == 2484)
 566                 return 14;
 567         else if (freq < 2484)
 568                 return (freq - 2407) / 5;
 569         else if (freq >= 4910 && freq <= 4980)
 570                 return (freq - 4000) / 5;
 571         else if(freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6)
 572                 return (freq - 56160) / 2160;
 573         else
 574                 return (freq - 5000) / 5;
 575 }
 576
 577 static int nl80211_channel2freq(int channel, const char *band)
 578 {
 579         if (!band || band[0] != 'a')
 580         {
 581                 if (channel == 14)
 582                         return 2484;
 583                 else if (channel < 14)
 584                         return (channel * 5) + 2407;
 585         }
 586         else if ( strcmp(band, "ad") == 0)
 587         {
 588                 return 56160 + 2160 * channel;
 589         }
 590         else
 591         {
 592                 if (channel >= 182 && channel <= 196)
 593                         return (channel * 5) + 4000;
 594                 else
 595                         return (channel * 5) + 5000;
 596         }
 597
 598         return 0;
 599 }
 600
 601 static int nl80211_ifname2phy_cb(struct nl_msg *msg, void *arg)
 602 {
 603         char *buf = arg;
 604         struct nlattr **attr = nl80211_parse(msg);
 605
 606         if (attr[NL80211_ATTR_WIPHY_NAME])
 607                 memcpy(buf, nla_data(attr[NL80211_ATTR_WIPHY_NAME]),
 608                        nla_len(attr[NL80211_ATTR_WIPHY_NAME]));
 609         else
 610                 buf[0] = 0;
 611
 612         return NL_SKIP;
 613 }
 614
 615 static char * nl80211_ifname2phy(const char *ifname)
 616 {
 617         static char phy[32] = { 0 };
 618
 619         memset(phy, 0, sizeof(phy));
 620
 621         nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
 622                         nl80211_ifname2phy_cb, phy);
 623
 624         return phy[0] ? phy : NULL;
 625 }
 626
 627 static char * nl80211_phy2ifname(const char *ifname)
 628 {
 629         int ifidx = -1, cifidx = -1, phyidx = -1;
 630         char buffer[64];
 631         static char nif[IFNAMSIZ] = { 0 };
 632
 633         DIR *d;
 634         struct dirent *e;
 635
 636         /* Only accept phy name of the form phy%d or radio%d */
 637         if (!ifname)
 638                 return NULL;
 639         else if (!strncmp(ifname, "phy", 3))
 640                 phyidx = atoi(&ifname[3]);
 641         else if (!strncmp(ifname, "radio", 5))
 642                 phyidx = nl80211_phy_idx_from_uci(ifname);
 643         else
 644                 return NULL;
 645
 646         memset(nif, 0, sizeof(nif));
 647
 648         if (phyidx > -1)
 649         {
 650                 if ((d = opendir("/sys/class/net")) != NULL)
 651                 {
 652                         while ((e = readdir(d)) != NULL)
 653                         {
 654                                 snprintf(buffer, sizeof(buffer),
 655                                          "/sys/class/net/%s/phy80211/index", e->d_name);
 656
 657                                 if (nl80211_readint(buffer) == phyidx)
 658                                 {
 659                                         snprintf(buffer, sizeof(buffer),
 660                                                  "/sys/class/net/%s/ifindex", e->d_name);
 661
 662                                         if ((cifidx = nl80211_readint(buffer)) >= 0 &&
 663                                             ((ifidx < 0) || (cifidx < ifidx)))
 664                                         {
 665                                                 ifidx = cifidx;
 666                                                 strncpy(nif, e->d_name, sizeof(nif) - 1);
 667                                         }
 668                                 }
 669                         }
 670
 671                         closedir(d);
 672                 }
 673         }
 674
 675         return nif[0] ? nif : NULL;
 676 }
 677
 678 static int nl80211_get_mode_cb(struct nl_msg *msg, void *arg)
 679 {
 680         int *mode = arg;
 681         struct nlattr **tb = nl80211_parse(msg);
 682         const int ifmodes[NL80211_IFTYPE_MAX + 1] = {
 683                 IWINFO_OPMODE_UNKNOWN,          /* unspecified */
 684                 IWINFO_OPMODE_ADHOC,            /* IBSS */
 685                 IWINFO_OPMODE_CLIENT,           /* managed */
 686                 IWINFO_OPMODE_MASTER,           /* AP */
 687                 IWINFO_OPMODE_AP_VLAN,          /* AP/VLAN */
 688                 IWINFO_OPMODE_WDS,                      /* WDS */
 689                 IWINFO_OPMODE_MONITOR,          /* monitor */
 690                 IWINFO_OPMODE_MESHPOINT,        /* mesh point */
 691                 IWINFO_OPMODE_P2P_CLIENT,       /* P2P-client */
 692                 IWINFO_OPMODE_P2P_GO,           /* P2P-GO */
 693         };
 694
 695         if (tb[NL80211_ATTR_IFTYPE])
 696                 *mode = ifmodes[nla_get_u32(tb[NL80211_ATTR_IFTYPE])];
 697
 698         return NL_SKIP;
 699 }
 700
 701
 702 static int nl80211_get_mode(const char *ifname, int *buf)
 703 {
 704         char *res;
 705
 706         *buf = IWINFO_OPMODE_UNKNOWN;
 707
 708         res = nl80211_phy2ifname(ifname);
 709
 710         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
 711                         nl80211_get_mode_cb, buf);
 712
 713         return (*buf == IWINFO_OPMODE_UNKNOWN) ? -1 : 0;
 714 }
 715
 716 static int __nl80211_hostapd_query(const char *ifname, ...)
 717 {
 718         va_list ap, ap_cur;
 719         char *phy, *search, *dest, *key, *val, buf[128];
 720         int len, mode, found = 0, match = 1;
 721         FILE *fp;
 722
 723         if (nl80211_get_mode(ifname, &mode))
 724                 return 0;
 725
 726         if (mode != IWINFO_OPMODE_MASTER && mode != IWINFO_OPMODE_AP_VLAN)
 727                 return 0;
 728
 729         phy = nl80211_ifname2phy(ifname);
 730
 731         if (!phy)
 732                 return 0;
 733
 734         snprintf(buf, sizeof(buf), "/var/run/hostapd-%s.conf", phy);
 735         fp = fopen(buf, "r");
 736
 737         if (!fp)
 738                 return 0;
 739
 740         va_start(ap, ifname);
 741
 742         /* clear all destination buffers */
 743         va_copy(ap_cur, ap);
 744
 745         while ((search = va_arg(ap_cur, char *)) != NULL)
 746         {
 747                 dest = va_arg(ap_cur, char *);
 748                 len  = va_arg(ap_cur, int);
 749
 750                 memset(dest, 0, len);
 751         }
 752
 753         va_end(ap_cur);
 754
 755         /* iterate applicable lines and copy found values into dest buffers */
 756         while (fgets(buf, sizeof(buf), fp))
 757         {
 758                 key = strtok(buf, " =\t\n");
 759                 val = strtok(NULL, "\n");
 760
 761                 if (!key || !val || !*key || *key == '#')
 762                         continue;
 763
 764                 if (!strcmp(key, "interface") || !strcmp(key, "bss"))
 765                         match = !strcmp(ifname, val);
 766
 767                 if (!match)
 768                         continue;
 769
 770                 va_copy(ap_cur, ap);
 771
 772                 while ((search = va_arg(ap_cur, char *)) != NULL)
 773                 {
 774                         dest = va_arg(ap_cur, char *);
 775                         len  = va_arg(ap_cur, int);
 776
 777                         if (!strcmp(search, key))
 778                         {
 779                                 strncpy(dest, val, len - 1);
 780                                 found++;
 781                                 break;
 782                         }
 783                 }
 784
 785                 va_end(ap_cur);
 786         }
 787
 788         fclose(fp);
 789
 790         va_end(ap);
 791
 792         return found;
 793 }
 794
 795 #define nl80211_hostapd_query(ifname, ...) \
 796         __nl80211_hostapd_query(ifname, ##__VA_ARGS__, NULL)
 797
 798
 799 static inline int nl80211_wpactl_recv(int sock, char *buf, int blen)
 800 {
 801         fd_set rfds;
 802         struct timeval tv = { 0, 256000 };
 803
 804         FD_ZERO(&rfds);
 805         FD_SET(sock, &rfds);
 806
 807         memset(buf, 0, blen);
 808
 809         if (select(sock + 1, &rfds, NULL, NULL, &tv) < 0)
 810                 return -1;
 811
 812         if (!FD_ISSET(sock, &rfds))
 813                 return -1;
 814
 815         return recv(sock, buf, blen - 1, 0);
 816 }
 817
 818 static int nl80211_wpactl_connect(const char *ifname, struct sockaddr_un *local)
 819 {
 820         struct sockaddr_un remote = { 0 };
 821         size_t remote_length, local_length;
 822
 823         int sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 824         if (sock < 0)
 825                 return sock;
 826
 827         remote.sun_family = AF_UNIX;
 828         remote_length = sizeof(remote.sun_family) +
 829                 sprintf(remote.sun_path, "/var/run/wpa_supplicant-%s/%s",
 830                         ifname, ifname);
 831
 832         if (fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC) < 0)
 833         {
 834                 close(sock);
 835                 return -1;
 836         }
 837
 838         if (connect(sock, (struct sockaddr *)&remote, remote_length))
 839         {
 840                 remote_length = sizeof(remote.sun_family) +
 841                         sprintf(remote.sun_path, "/var/run/wpa_supplicant/%s", ifname);
 842
 843                 if (connect(sock, (struct sockaddr *)&remote, remote_length))
 844                 {
 845                         close(sock);
 846                         return -1;
 847                 }
 848         }
 849
 850         local->sun_family = AF_UNIX;
 851         local_length = sizeof(local->sun_family) +
 852                 sprintf(local->sun_path, "/var/run/iwinfo-%s-%d", ifname, getpid());
 853
 854         if (bind(sock, (struct sockaddr *)local, local_length) < 0)
 855         {
 856                 close(sock);
 857                 return -1;
 858         }
 859
 860         return sock;
 861 }
 862
 863 static int __nl80211_wpactl_query(const char *ifname, ...)
 864 {
 865         va_list ap, ap_cur;
 866         struct sockaddr_un local = { 0 };
 867         int len, mode, found = 0, sock = -1;
 868         char *search, *dest, *key, *val, *line, *pos, buf[512];
 869
 870         if (nl80211_get_mode(ifname, &mode))
 871                 return 0;
 872
 873         if (mode != IWINFO_OPMODE_CLIENT && mode != IWINFO_OPMODE_ADHOC)
 874                 return 0;
 875
 876         sock = nl80211_wpactl_connect(ifname, &local);
 877
 878         if (sock < 0)
 879                 return 0;
 880
 881         va_start(ap, ifname);
 882
 883         /* clear all destination buffers */
 884         va_copy(ap_cur, ap);
 885
 886         while ((search = va_arg(ap_cur, char *)) != NULL)
 887         {
 888                 dest = va_arg(ap_cur, char *);
 889                 len  = va_arg(ap_cur, int);
 890
 891                 memset(dest, 0, len);
 892         }
 893
 894         va_end(ap_cur);
 895
 896         send(sock, "STATUS", 6, 0);
 897
 898         while (true)
 899         {
 900                 if (nl80211_wpactl_recv(sock, buf, sizeof(buf)) <= 0)
 901                         break;
 902
 903                 if (buf[0] == '<')
 904                         continue;
 905
 906                 for (line = strtok_r(buf, "\n", &pos);
 907                          line != NULL;
 908                          line = strtok_r(NULL, "\n", &pos))
 909                 {
 910                         key = strtok(line, "=");
 911                         val = strtok(NULL, "\n");
 912
 913                         if (!key || !val)
 914                                 continue;
 915
 916                         va_copy(ap_cur, ap);
 917
 918                         while ((search = va_arg(ap_cur, char *)) != NULL)
 919                         {
 920                                 dest = va_arg(ap_cur, char *);
 921                                 len  = va_arg(ap_cur, int);
 922
 923                                 if (!strcmp(search, key))
 924                                 {
 925                                         strncpy(dest, val, len - 1);
 926                                         found++;
 927                                         break;
 928                                 }
 929                         }
 930
 931                         va_end(ap_cur);
 932                 }
 933
 934                 break;
 935         }
 936
 937         va_end(ap);
 938
 939         close(sock);
 940         unlink(local.sun_path);
 941
 942         return found;
 943 }
 944
 945 #define nl80211_wpactl_query(ifname, ...) \
 946         __nl80211_wpactl_query(ifname, ##__VA_ARGS__, NULL)
 947
 948
 949 static char * nl80211_ifadd(const char *ifname)
 950 {
 951         char path[PATH_MAX];
 952         static char nif[IFNAMSIZ] = { 0 };
 953         struct nl80211_msg_conveyor *req;
 954         FILE *sysfs;
 955
 956         req = nl80211_msg(ifname, NL80211_CMD_NEW_INTERFACE, 0);
 957         if (req)
 958         {
 959                 snprintf(nif, sizeof(nif), "tmp.%s", ifname);
 960
 961                 NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, nif);
 962                 NLA_PUT_U32(req->msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_STATION);
 963
 964                 nl80211_send(req, NULL, NULL);
 965
 966                 snprintf(path, sizeof(path) - 1,
 967                          "/proc/sys/net/ipv6/conf/%s/disable_ipv6", nif);
 968
 969                 if ((sysfs = fopen(path, "w")) != NULL)
 970                 {
 971                         fwrite("0\n", 1, 2, sysfs);
 972                         fclose(sysfs);
 973                 }
 974
 975                 return nif;
 976
 977         nla_put_failure:
 978                 nl80211_free(req);
 979         }
 980
 981         return NULL;
 982 }
 983
 984 static void nl80211_ifdel(const char *ifname)
 985 {
 986         struct nl80211_msg_conveyor *req;
 987         int err;
 988
 989         req = nl80211_msg(ifname, NL80211_CMD_DEL_INTERFACE, 0);
 990         if (req)
 991         {
 992                 NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, ifname);
 993
 994                 nl80211_send(req, NULL, NULL);
 995                 return;
 996
 997         nla_put_failure:
 998                 nl80211_free(req);
 999         }
1000 }
1001
1002 static void nl80211_hostapd_hup(const char *ifname)
1003 {
1004         int fd, pid = 0;
1005         char buf[32];
1006         char *phy = nl80211_ifname2phy(ifname);
1007
1008         if (phy)
1009         {
1010                 snprintf(buf, sizeof(buf), "/var/run/wifi-%s.pid", phy);
1011                 if ((fd = open(buf, O_RDONLY)) >= 0)
1012                 {
1013                         if (read(fd, buf, sizeof(buf)) > 0)
1014                                 pid = atoi(buf);
1015
1016                         close(fd);
1017                 }
1018
1019                 if (pid > 0)
1020                         kill(pid, 1);
1021         }
1022 }
1023
1024
1025 static int nl80211_probe(const char *ifname)
1026 {
1027         return !!nl80211_ifname2phy(ifname);
1028 }
1029
1030 struct nl80211_ssid_bssid {
1031         unsigned char *ssid;
1032         unsigned char bssid[7];
1033 };
1034
1035 static int nl80211_get_macaddr_cb(struct nl_msg *msg, void *arg)
1036 {
1037         struct nl80211_ssid_bssid *sb = arg;
1038         struct nlattr **tb = nl80211_parse(msg);
1039
1040         if (tb[NL80211_ATTR_MAC]) {
1041                 sb->bssid[0] = 1;
1042                 memcpy(sb->bssid + 1, nla_data(tb[NL80211_ATTR_MAC]),
1043                        sizeof(sb->bssid) - 1);
1044         }
1045
1046         return NL_SKIP;
1047 }
1048
1049 static int nl80211_get_ssid_bssid_cb(struct nl_msg *msg, void *arg)
1050 {
1051         int ielen;
1052         unsigned char *ie;
1053         struct nl80211_ssid_bssid *sb = arg;
1054         struct nlattr **tb = nl80211_parse(msg);
1055         struct nlattr *bss[NL80211_BSS_MAX + 1];
1056
1057         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
1058                 [NL80211_BSS_INFORMATION_ELEMENTS] = { 0 },
1059                 [NL80211_BSS_STATUS]               = { .type = NLA_U32 },
1060         };
1061
1062         if (!tb[NL80211_ATTR_BSS] ||
1063             nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
1064                              bss_policy) ||
1065             !bss[NL80211_BSS_BSSID] ||
1066             !bss[NL80211_BSS_STATUS] ||
1067             !bss[NL80211_BSS_INFORMATION_ELEMENTS])
1068         {
1069                 return NL_SKIP;
1070         }
1071
1072         switch (nla_get_u32(bss[NL80211_BSS_STATUS]))
1073         {
1074         case NL80211_BSS_STATUS_ASSOCIATED:
1075         case NL80211_BSS_STATUS_AUTHENTICATED:
1076         case NL80211_BSS_STATUS_IBSS_JOINED:
1077
1078                 if (sb->ssid)
1079                 {
1080                         ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
1081                         ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
1082
1083                         while (ielen >= 2 && ielen >= ie[1])
1084                         {
1085                                 if (ie[0] == 0)
1086                                 {
1087                                         memcpy(sb->ssid, ie + 2, min(ie[1], IWINFO_ESSID_MAX_SIZE));
1088                                         return NL_SKIP;
1089                                 }
1090
1091                                 ielen -= ie[1] + 2;
1092                                 ie += ie[1] + 2;
1093                         }
1094                 }
1095                 else
1096                 {
1097                         sb->bssid[0] = 1;
1098                         memcpy(sb->bssid + 1, nla_data(bss[NL80211_BSS_BSSID]), 6);
1099                         return NL_SKIP;
1100                 }
1101
1102         default:
1103                 return NL_SKIP;
1104         }
1105 }
1106
1107 static int nl80211_get_ssid(const char *ifname, char *buf)
1108 {
1109         char *res;
1110         struct nl80211_ssid_bssid sb = { .ssid = (unsigned char *)buf };
1111
1112         /* try to find ssid from scan dump results */
1113         res = nl80211_phy2ifname(ifname);
1114         sb.ssid[0] = 0;
1115
1116         nl80211_request(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1117                         nl80211_get_ssid_bssid_cb, &sb);
1118
1119         /* failed, try to find from hostapd info */
1120         if (sb.ssid[0] == 0)
1121                 nl80211_hostapd_query(ifname, "ssid", sb.ssid,
1122                                       IWINFO_ESSID_MAX_SIZE + 1);
1123
1124         /* failed, try to obtain Mesh ID */
1125         if (sb.ssid[0] == 0)
1126                 iwinfo_ubus_query(res ? res : ifname, "mesh_id",
1127                                   sb.ssid, IWINFO_ESSID_MAX_SIZE + 1);
1128
1129         return (sb.ssid[0] == 0) ? -1 : 0;
1130 }
1131
1132 static int nl80211_get_bssid(const char *ifname, char *buf)
1133 {
1134         char *res, bssid[sizeof("FF:FF:FF:FF:FF:FF\0")];
1135         struct nl80211_ssid_bssid sb = { };
1136
1137         res = nl80211_phy2ifname(ifname);
1138
1139         /* try to obtain mac address via NL80211_CMD_GET_INTERFACE */
1140         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1141                         nl80211_get_macaddr_cb, &sb);
1142
1143         /* failed, try to find bssid from scan dump results */
1144         if (sb.bssid[0] == 0)
1145                 nl80211_request(res ? res : ifname,
1146                                 NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1147                                 nl80211_get_ssid_bssid_cb, &sb);
1148
1149         /* failed, try to find mac from hostapd info */
1150         if ((sb.bssid[0] == 0) &&
1151             nl80211_hostapd_query(ifname, "bssid", bssid, sizeof(bssid)))
1152         {
1153                 sb.bssid[0] = 1;
1154                 sb.bssid[1] = strtol(&bssid[0],  NULL, 16);
1155                 sb.bssid[2] = strtol(&bssid[3],  NULL, 16);
1156                 sb.bssid[3] = strtol(&bssid[6],  NULL, 16);
1157                 sb.bssid[4] = strtol(&bssid[9],  NULL, 16);
1158                 sb.bssid[5] = strtol(&bssid[12], NULL, 16);
1159                 sb.bssid[6] = strtol(&bssid[15], NULL, 16);
1160         }
1161
1162         if (sb.bssid[0])
1163         {
1164                 sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
1165                         sb.bssid[1], sb.bssid[2], sb.bssid[3],
1166                         sb.bssid[4], sb.bssid[5], sb.bssid[6]);
1167
1168                 return 0;
1169         }
1170
1171         return -1;
1172 }
1173
1174
1175 static int nl80211_get_frequency_scan_cb(struct nl_msg *msg, void *arg)
1176 {
1177         int *freq = arg;
1178         struct nlattr **attr = nl80211_parse(msg);
1179         struct nlattr *binfo[NL80211_BSS_MAX + 1];
1180
1181         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
1182                 [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
1183                 [NL80211_BSS_STATUS]    = { .type = NLA_U32 },
1184         };
1185
1186         if (attr[NL80211_ATTR_BSS] &&
1187             !nla_parse_nested(binfo, NL80211_BSS_MAX,
1188                               attr[NL80211_ATTR_BSS], bss_policy))
1189         {
1190                 if (binfo[NL80211_BSS_STATUS] && binfo[NL80211_BSS_FREQUENCY])
1191                         *freq = nla_get_u32(binfo[NL80211_BSS_FREQUENCY]);
1192         }
1193
1194         return NL_SKIP;
1195 }
1196
1197 static int nl80211_get_frequency_info_cb(struct nl_msg *msg, void *arg)
1198 {
1199         int *freq = arg;
1200         struct nlattr **tb = nl80211_parse(msg);
1201
1202         if (tb[NL80211_ATTR_WIPHY_FREQ])
1203                 *freq = nla_get_u32(tb[NL80211_ATTR_WIPHY_FREQ]);
1204
1205         return NL_SKIP;
1206 }
1207
1208 static int nl80211_get_frequency(const char *ifname, int *buf)
1209 {
1210         char *res, channel[4], hwmode[3];
1211
1212         /* try to find frequency from interface info */
1213         res = nl80211_phy2ifname(ifname);
1214         *buf = 0;
1215
1216         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1217                         nl80211_get_frequency_info_cb, buf);
1218
1219         /* failed, try to find frequency from hostapd info */
1220         if ((*buf == 0) &&
1221             nl80211_hostapd_query(ifname, "hw_mode", hwmode, sizeof(hwmode),
1222                                           "channel", channel, sizeof(channel)) == 2)
1223         {
1224                 *buf = nl80211_channel2freq(atoi(channel), hwmode);
1225         }
1226
1227         /* failed, try to find frequency from scan results */
1228         if (*buf == 0)
1229         {
1230                 res = nl80211_phy2ifname(ifname);
1231
1232                 nl80211_request(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1233                                 nl80211_get_frequency_scan_cb, buf);
1234         }
1235
1236         return (*buf == 0) ? -1 : 0;
1237 }
1238
1239 static int nl80211_get_channel(const char *ifname, int *buf)
1240 {
1241         if (!nl80211_get_frequency(ifname, buf))
1242         {
1243                 *buf = nl80211_freq2channel(*buf);
1244                 return 0;
1245         }
1246
1247         return -1;
1248 }
1249
1250 static int nl80211_get_txpower_cb(struct nl_msg *msg, void *arg)
1251 {
1252         int *buf = arg;
1253         struct nlattr **tb = nl80211_parse(msg);
1254
1255         if (tb[NL80211_ATTR_WIPHY_TX_POWER_LEVEL])
1256                 *buf = iwinfo_mbm2dbm(nla_get_u32(tb[NL80211_ATTR_WIPHY_TX_POWER_LEVEL]));
1257
1258         return NL_SKIP;
1259 }
1260
1261 static int nl80211_get_txpower(const char *ifname, int *buf)
1262 {
1263         char *res;
1264
1265         res = nl80211_phy2ifname(ifname);
1266         *buf = 0;
1267
1268         if (nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1269                             nl80211_get_txpower_cb, buf))
1270                 return -1;
1271
1272         return 0;
1273 }
1274
1275
1276 static int nl80211_fill_signal_cb(struct nl_msg *msg, void *arg)
1277 {
1278         int8_t dbm;
1279         int16_t mbit;
1280         struct nl80211_rssi_rate *rr = arg;
1281         struct nlattr **attr = nl80211_parse(msg);
1282         struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
1283         struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
1284
1285         static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
1286                 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32    },
1287                 [NL80211_STA_INFO_RX_BYTES]      = { .type = NLA_U32    },
1288                 [NL80211_STA_INFO_TX_BYTES]      = { .type = NLA_U32    },
1289                 [NL80211_STA_INFO_RX_PACKETS]    = { .type = NLA_U32    },
1290                 [NL80211_STA_INFO_TX_PACKETS]    = { .type = NLA_U32    },
1291                 [NL80211_STA_INFO_SIGNAL]        = { .type = NLA_U8     },
1292                 [NL80211_STA_INFO_TX_BITRATE]    = { .type = NLA_NESTED },
1293                 [NL80211_STA_INFO_LLID]          = { .type = NLA_U16    },
1294                 [NL80211_STA_INFO_PLID]          = { .type = NLA_U16    },
1295                 [NL80211_STA_INFO_PLINK_STATE]   = { .type = NLA_U8     },
1296         };
1297
1298         static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
1299                 [NL80211_RATE_INFO_BITRATE]      = { .type = NLA_U16  },
1300                 [NL80211_RATE_INFO_MCS]          = { .type = NLA_U8   },
1301                 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG },
1302                 [NL80211_RATE_INFO_SHORT_GI]     = { .type = NLA_FLAG },
1303         };
1304
1305         if (attr[NL80211_ATTR_STA_INFO])
1306         {
1307                 if (!nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
1308                                       attr[NL80211_ATTR_STA_INFO], stats_policy))
1309                 {
1310                         if (sinfo[NL80211_STA_INFO_SIGNAL])
1311                         {
1312                                 dbm = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
1313                                 rr->rssi = (rr->rssi * rr->rssi_samples + dbm) / (rr->rssi_samples + 1);
1314                                 rr->rssi_samples++;
1315                         }
1316
1317                         if (sinfo[NL80211_STA_INFO_TX_BITRATE])
1318                         {
1319                                 if (!nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
1320                                                       sinfo[NL80211_STA_INFO_TX_BITRATE],
1321                                                       rate_policy))
1322                                 {
1323                                         if (rinfo[NL80211_RATE_INFO_BITRATE])
1324                                         {
1325                                                 mbit = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]);
1326                                                 rr->rate = (rr->rate * rr->rate_samples + mbit) / (rr->rate_samples + 1);
1327                                                 rr->rate_samples++;
1328                                         }
1329                                 }
1330                         }
1331                 }
1332         }
1333
1334         return NL_SKIP;
1335 }
1336
1337 static void nl80211_fill_signal(const char *ifname, struct nl80211_rssi_rate *r)
1338 {
1339         DIR *d;
1340         struct dirent *de;
1341
1342         memset(r, 0, sizeof(*r));
1343
1344         if ((d = opendir("/sys/class/net")) != NULL)
1345         {
1346                 while ((de = readdir(d)) != NULL)
1347                 {
1348                         if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
1349                             (!de->d_name[strlen(ifname)] ||
1350                              !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
1351                         {
1352                                 nl80211_request(de->d_name, NL80211_CMD_GET_STATION,
1353                                                 NLM_F_DUMP, nl80211_fill_signal_cb, r);
1354                         }
1355                 }
1356
1357                 closedir(d);
1358         }
1359 }
1360
1361 static int nl80211_get_bitrate(const char *ifname, int *buf)
1362 {
1363         struct nl80211_rssi_rate rr;
1364
1365         nl80211_fill_signal(ifname, &rr);
1366
1367         if (rr.rate_samples)
1368         {
1369                 *buf = (rr.rate * 100);
1370                 return 0;
1371         }
1372
1373         return -1;
1374 }
1375
1376 static int nl80211_get_signal(const char *ifname, int *buf)
1377 {
1378         struct nl80211_rssi_rate rr;
1379
1380         nl80211_fill_signal(ifname, &rr);
1381
1382         if (rr.rssi_samples)
1383         {
1384                 *buf = rr.rssi;
1385                 return 0;
1386         }
1387
1388         return -1;
1389 }
1390
1391 static int nl80211_get_noise_cb(struct nl_msg *msg, void *arg)
1392 {
1393         int8_t *noise = arg;
1394         struct nlattr **tb = nl80211_parse(msg);
1395         struct nlattr *si[NL80211_SURVEY_INFO_MAX + 1];
1396
1397         static struct nla_policy sp[NL80211_SURVEY_INFO_MAX + 1] = {
1398                 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
1399                 [NL80211_SURVEY_INFO_NOISE]     = { .type = NLA_U8  },
1400         };
1401
1402         if (!tb[NL80211_ATTR_SURVEY_INFO])
1403                 return NL_SKIP;
1404
1405         if (nla_parse_nested(si, NL80211_SURVEY_INFO_MAX,
1406                              tb[NL80211_ATTR_SURVEY_INFO], sp))
1407                 return NL_SKIP;
1408
1409         if (!si[NL80211_SURVEY_INFO_NOISE])
1410                 return NL_SKIP;
1411
1412         if (!*noise || si[NL80211_SURVEY_INFO_IN_USE])
1413                 *noise = (int8_t)nla_get_u8(si[NL80211_SURVEY_INFO_NOISE]);
1414
1415         return NL_SKIP;
1416 }
1417
1418
1419 static int nl80211_get_noise(const char *ifname, int *buf)
1420 {
1421         int8_t noise = 0;
1422
1423         if (nl80211_request(ifname, NL80211_CMD_GET_SURVEY, NLM_F_DUMP,
1424                             nl80211_get_noise_cb, &noise))
1425                 goto out;
1426
1427         *buf = noise;
1428         return 0;
1429
1430 out:
1431         *buf = 0;
1432         return -1;
1433 }
1434
1435 static int nl80211_get_quality(const char *ifname, int *buf)
1436 {
1437         int signal;
1438
1439         if (!nl80211_get_signal(ifname, &signal))
1440         {
1441                 /* A positive signal level is usually just a quality
1442                  * value, pass through as-is */
1443                 if (signal >= 0)
1444                 {
1445                         *buf = signal;
1446                 }
1447
1448                 /* The cfg80211 wext compat layer assumes a signal range
1449                  * of -110 dBm to -40 dBm, the quality value is derived
1450                  * by adding 110 to the signal level */
1451                 else
1452                 {
1453                         if (signal < -110)
1454                                 signal = -110;
1455                         else if (signal > -40)
1456                                 signal = -40;
1457
1458                         *buf = (signal + 110);
1459                 }
1460
1461                 return 0;
1462         }
1463
1464         return -1;
1465 }
1466
1467 static int nl80211_get_quality_max(const char *ifname, int *buf)
1468 {
1469         /* The cfg80211 wext compat layer assumes a maximum
1470          * quality of 70 */
1471         *buf = 70;
1472
1473         return 0;
1474 }
1475
1476 static int nl80211_check_wepkey(const char *key)
1477 {
1478         if (key && *key)
1479         {
1480                 switch (strlen(key))
1481                 {
1482                 case 5:
1483                 case 10:
1484                         return IWINFO_CIPHER_WEP40;
1485
1486                 case 13:
1487                 case 26:
1488                         return IWINFO_CIPHER_WEP104;
1489                 }
1490         }
1491
1492         return 0;
1493 }
1494
1495 static int nl80211_get_encryption(const char *ifname, char *buf)
1496 {
1497         char wpa[2], wpa_key_mgmt[64], wpa_pairwise[16], wpa_groupwise[16];
1498         char auth_algs[2], wep_key0[27], wep_key1[27], wep_key2[27], wep_key3[27];
1499
1500         struct iwinfo_crypto_entry *c = (struct iwinfo_crypto_entry *)buf;
1501
1502         /* WPA supplicant */
1503         if (nl80211_wpactl_query(ifname,
1504                         "pairwise_cipher", wpa_pairwise,  sizeof(wpa_pairwise),
1505                         "group_cipher",    wpa_groupwise, sizeof(wpa_groupwise),
1506                         "key_mgmt",        wpa_key_mgmt,  sizeof(wpa_key_mgmt)))
1507         {
1508                 /* WEP */
1509                 if (!strcmp(wpa_key_mgmt, "NONE"))
1510                 {
1511                         if (strstr(wpa_pairwise, "WEP-40"))
1512                                 c->pair_ciphers |= IWINFO_CIPHER_WEP40;
1513                         else if (strstr(wpa_pairwise, "WEP-104"))
1514                                 c->pair_ciphers |= IWINFO_CIPHER_WEP104;
1515
1516                         if (strstr(wpa_groupwise, "WEP-40"))
1517                                 c->group_ciphers |= IWINFO_CIPHER_WEP40;
1518                         else if (strstr(wpa_groupwise, "WEP-104"))
1519                                 c->group_ciphers |= IWINFO_CIPHER_WEP104;
1520
1521                         c->enabled      = !!(c->pair_ciphers | c->group_ciphers);
1522                         c->auth_suites |= IWINFO_KMGMT_NONE;
1523                         c->auth_algs   |= IWINFO_AUTH_OPEN; /* XXX: assumption */
1524                 }
1525
1526                 /* WPA */
1527                 else if (strstr(wpa_key_mgmt, "WPA"))
1528                 {
1529                         if (strstr(wpa_pairwise, "TKIP"))
1530                                 c->pair_ciphers |= IWINFO_CIPHER_TKIP;
1531                         else if (strstr(wpa_pairwise, "CCMP"))
1532                                 c->pair_ciphers |= IWINFO_CIPHER_CCMP;
1533                         else if (strstr(wpa_pairwise, "NONE"))
1534                                 c->pair_ciphers |= IWINFO_CIPHER_NONE;
1535                         else if (strstr(wpa_pairwise, "WEP-40"))
1536                                 c->pair_ciphers |= IWINFO_CIPHER_WEP40;
1537                         else if (strstr(wpa_pairwise, "WEP-104"))
1538                                 c->pair_ciphers |= IWINFO_CIPHER_WEP104;
1539
1540                         if (strstr(wpa_groupwise, "TKIP"))
1541                                 c->group_ciphers |= IWINFO_CIPHER_TKIP;
1542                         else if (strstr(wpa_groupwise, "CCMP"))
1543                                 c->group_ciphers |= IWINFO_CIPHER_CCMP;
1544                         else if (strstr(wpa_groupwise, "NONE"))
1545                                 c->group_ciphers |= IWINFO_CIPHER_NONE;
1546                         else if (strstr(wpa_groupwise, "WEP-40"))
1547                                 c->group_ciphers |= IWINFO_CIPHER_WEP40;
1548                         else if (strstr(wpa_groupwise, "WEP-104"))
1549                                 c->group_ciphers |= IWINFO_CIPHER_WEP104;
1550
1551                         if (strstr(wpa_key_mgmt, "WPA2"))
1552                                 c->wpa_version = 2;
1553                         else if (strstr(wpa_key_mgmt, "WPA"))
1554                                 c->wpa_version = 1;
1555
1556                         if (strstr(wpa_key_mgmt, "PSK"))
1557                                 c->auth_suites |= IWINFO_KMGMT_PSK;
1558                         else if (strstr(wpa_key_mgmt, "EAP") ||
1559                                  strstr(wpa_key_mgmt, "802.1X"))
1560                                 c->auth_suites |= IWINFO_KMGMT_8021x;
1561                         else if (strstr(wpa_key_mgmt, "NONE"))
1562                                 c->auth_suites |= IWINFO_KMGMT_NONE;
1563
1564                         c->enabled = !!(c->wpa_version && c->auth_suites);
1565                 }
1566
1567                 return 0;
1568         }
1569
1570         /* Hostapd */
1571         else if (nl80211_hostapd_query(ifname,
1572                                 "wpa",          wpa,          sizeof(wpa),
1573                                 "wpa_key_mgmt", wpa_key_mgmt, sizeof(wpa_key_mgmt),
1574                                 "wpa_pairwise", wpa_pairwise, sizeof(wpa_pairwise),
1575                                 "auth_algs",    auth_algs,    sizeof(auth_algs),
1576                                 "wep_key0",     wep_key0,     sizeof(wep_key0),
1577                                 "wep_key1",     wep_key1,     sizeof(wep_key1),
1578                                 "wep_key2",     wep_key2,     sizeof(wep_key2),
1579                                 "wep_key3",     wep_key3,     sizeof(wep_key3)))
1580         {
1581                 c->wpa_version = wpa[0] ? atoi(wpa) : 0;
1582
1583                 if (wpa_key_mgmt[0])
1584                 {
1585                         if (strstr(wpa_key_mgmt, "PSK"))
1586                                 c->auth_suites |= IWINFO_KMGMT_PSK;
1587
1588                         if (strstr(wpa_key_mgmt, "EAP"))
1589                                 c->auth_suites |= IWINFO_KMGMT_8021x;
1590
1591                         if (strstr(wpa_key_mgmt, "SAE")){
1592                                 c->auth_suites |= IWINFO_KMGMT_SAE;
1593                                 c->wpa_version = 4;
1594                         }
1595
1596                         if (strstr(wpa_key_mgmt, "OWE")){
1597                                 c->auth_suites |= IWINFO_KMGMT_OWE;
1598                                 c->wpa_version = 4;
1599                         }
1600
1601                         if (strstr(wpa_key_mgmt, "NONE"))
1602                                 c->auth_suites |= IWINFO_KMGMT_NONE;
1603                 }
1604                 else
1605                 {
1606                         c->auth_suites |= IWINFO_KMGMT_PSK;
1607                 }
1608
1609                 if (wpa_pairwise[0])
1610                 {
1611                         if (strstr(wpa_pairwise, "TKIP"))
1612                                 c->pair_ciphers |= IWINFO_CIPHER_TKIP;
1613
1614                         if (strstr(wpa_pairwise, "CCMP"))
1615                                 c->pair_ciphers |= IWINFO_CIPHER_CCMP;
1616
1617                         if (strstr(wpa_pairwise, "NONE"))
1618                                 c->pair_ciphers |= IWINFO_CIPHER_NONE;
1619                 }
1620
1621                 if (auth_algs[0])
1622                 {
1623                         switch(atoi(auth_algs))
1624                         {
1625                         case 1:
1626                                 c->auth_algs |= IWINFO_AUTH_OPEN;
1627                                 break;
1628
1629                         case 2:
1630                                 c->auth_algs |= IWINFO_AUTH_SHARED;
1631                                 break;
1632
1633                         case 3:
1634                                 c->auth_algs |= IWINFO_AUTH_OPEN;
1635                                 c->auth_algs |= IWINFO_AUTH_SHARED;
1636                                 break;
1637                         }
1638
1639                         c->pair_ciphers |= nl80211_check_wepkey(wep_key0);
1640                         c->pair_ciphers |= nl80211_check_wepkey(wep_key1);
1641                         c->pair_ciphers |= nl80211_check_wepkey(wep_key2);
1642                         c->pair_ciphers |= nl80211_check_wepkey(wep_key3);
1643                 }
1644
1645                 c->group_ciphers = c->pair_ciphers;
1646                 c->enabled = (c->wpa_version || c->pair_ciphers) ? 1 : 0;
1647
1648                 return 0;
1649         }
1650
1651         return -1;
1652 }
1653
1654 static int nl80211_get_phyname(const char *ifname, char *buf)
1655 {
1656         const char *name;
1657
1658         name = nl80211_ifname2phy(ifname);
1659
1660         if (name)
1661         {
1662                 strcpy(buf, name);
1663                 return 0;
1664         }
1665         else if ((name = nl80211_phy2ifname(ifname)) != NULL)
1666         {
1667                 name = nl80211_ifname2phy(name);
1668
1669                 if (name)
1670                 {
1671                         strcpy(buf, ifname);
1672                         return 0;
1673                 }
1674         }
1675
1676         return -1;
1677 }
1678
1679
1680 static void nl80211_parse_rateinfo(struct nlattr **ri,
1681                                    struct iwinfo_rate_entry *re)
1682 {
1683         if (ri[NL80211_RATE_INFO_BITRATE32])
1684                 re->rate = nla_get_u32(ri[NL80211_RATE_INFO_BITRATE32]) * 100;
1685         else if (ri[NL80211_RATE_INFO_BITRATE])
1686                 re->rate = nla_get_u16(ri[NL80211_RATE_INFO_BITRATE]) * 100;
1687
1688         if (ri[NL80211_RATE_INFO_VHT_MCS])
1689         {
1690                 re->is_vht = 1;
1691                 re->mcs = nla_get_u8(ri[NL80211_RATE_INFO_VHT_MCS]);
1692
1693                 if (ri[NL80211_RATE_INFO_VHT_NSS])
1694                         re->nss = nla_get_u8(ri[NL80211_RATE_INFO_VHT_NSS]);
1695         }
1696         else if (ri[NL80211_RATE_INFO_MCS])
1697         {
1698                 re->is_ht = 1;
1699                 re->mcs = nla_get_u8(ri[NL80211_RATE_INFO_MCS]);
1700         }
1701
1702         if (ri[NL80211_RATE_INFO_5_MHZ_WIDTH])
1703                 re->mhz = 5;
1704         else if (ri[NL80211_RATE_INFO_10_MHZ_WIDTH])
1705                 re->mhz = 10;
1706         else if (ri[NL80211_RATE_INFO_40_MHZ_WIDTH])
1707                 re->mhz = 40;
1708         else if (ri[NL80211_RATE_INFO_80_MHZ_WIDTH])
1709                 re->mhz = 80;
1710         else if (ri[NL80211_RATE_INFO_80P80_MHZ_WIDTH] ||
1711                  ri[NL80211_RATE_INFO_160_MHZ_WIDTH])
1712                 re->mhz = 160;
1713         else
1714                 re->mhz = 20;
1715
1716         if (ri[NL80211_RATE_INFO_SHORT_GI])
1717                 re->is_short_gi = 1;
1718
1719         re->is_40mhz = (re->mhz == 40);
1720 }
1721
1722 static int nl80211_get_survey_cb(struct nl_msg *msg, void *arg)
1723 {
1724         struct nl80211_array_buf *arr = arg;
1725         struct iwinfo_survey_entry *e = arr->buf;
1726         struct nlattr **attr = nl80211_parse(msg);
1727         struct nlattr *sinfo[NL80211_SURVEY_INFO_MAX + 1];
1728         int rc;
1729
1730         static struct nla_policy survey_policy[NL80211_SURVEY_INFO_MAX + 1] = {
1731                 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
1732                 [NL80211_SURVEY_INFO_NOISE]  = { .type = NLA_U8     },
1733                 [NL80211_SURVEY_INFO_TIME] = { .type = NLA_U64   },
1734                 [NL80211_SURVEY_INFO_TIME_BUSY] = { .type = NLA_U64   },
1735                 [NL80211_SURVEY_INFO_TIME_EXT_BUSY] = { .type = NLA_U64   },
1736                 [NL80211_SURVEY_INFO_TIME_RX] = { .type = NLA_U64   },
1737                 [NL80211_SURVEY_INFO_TIME_TX] = { .type = NLA_U64   },
1738         };
1739
1740         rc = nla_parse_nested(sinfo, NL80211_SURVEY_INFO_MAX,
1741                                 attr[NL80211_ATTR_SURVEY_INFO],
1742                                 survey_policy);
1743         if (rc)
1744                 return NL_SKIP;
1745
1746         /* advance to end of array */
1747         e += arr->count;
1748         memset(e, 0, sizeof(*e));
1749
1750         if (sinfo[NL80211_SURVEY_INFO_FREQUENCY])
1751                 e->mhz = nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]);
1752
1753         if (sinfo[NL80211_SURVEY_INFO_NOISE])
1754                 e->noise = nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]);
1755
1756         if (sinfo[NL80211_SURVEY_INFO_TIME])
1757                 e->active_time = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME]);
1758
1759         if (sinfo[NL80211_SURVEY_INFO_TIME_BUSY])
1760                 e->busy_time = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_BUSY]);
1761
1762         if (sinfo[NL80211_SURVEY_INFO_TIME_EXT_BUSY])
1763                 e->busy_time_ext = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_EXT_BUSY]);
1764
1765         if (sinfo[NL80211_SURVEY_INFO_TIME_RX])
1766                 e->rxtime = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_RX]);
1767
1768         if (sinfo[NL80211_SURVEY_INFO_TIME_TX])
1769                 e->txtime = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_TX]);
1770
1771         arr->count++;
1772         return NL_SKIP;
1773 }
1774
1775
1776 static void plink_state_to_str(char *dst, unsigned state)
1777 {
1778         switch (state) {
1779         case NL80211_PLINK_LISTEN:
1780                 strcpy(dst, "LISTEN");
1781                 break;
1782         case NL80211_PLINK_OPN_SNT:
1783                 strcpy(dst, "OPN_SNT");
1784                 break;
1785         case NL80211_PLINK_OPN_RCVD:
1786                 strcpy(dst, "OPN_RCVD");
1787                 break;
1788         case NL80211_PLINK_CNF_RCVD:
1789                 strcpy(dst, "CNF_RCVD");
1790                 break;
1791         case NL80211_PLINK_ESTAB:
1792                 strcpy(dst, "ESTAB");
1793                 break;
1794         case NL80211_PLINK_HOLDING:
1795                 strcpy(dst, "HOLDING");
1796                 break;
1797         case NL80211_PLINK_BLOCKED:
1798                 strcpy(dst, "BLOCKED");
1799                 break;
1800         default:
1801                 strcpy(dst, "UNKNOWN");
1802                 break;
1803         }
1804 }
1805
1806 static void power_mode_to_str(char *dst, struct nlattr *a)
1807 {
1808         enum nl80211_mesh_power_mode pm = nla_get_u32(a);
1809
1810         switch (pm) {
1811         case NL80211_MESH_POWER_ACTIVE:
1812                 strcpy(dst, "ACTIVE");
1813                 break;
1814         case NL80211_MESH_POWER_LIGHT_SLEEP:
1815                 strcpy(dst, "LIGHT SLEEP");
1816                 break;
1817         case NL80211_MESH_POWER_DEEP_SLEEP:
1818                 strcpy(dst, "DEEP SLEEP");
1819                 break;
1820         default:
1821                 strcpy(dst, "UNKNOWN");
1822                 break;
1823         }
1824 }
1825
1826 static int nl80211_get_assoclist_cb(struct nl_msg *msg, void *arg)
1827 {
1828         struct nl80211_array_buf *arr = arg;
1829         struct iwinfo_assoclist_entry *e = arr->buf;
1830         struct nlattr **attr = nl80211_parse(msg);
1831         struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
1832         struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
1833         struct nl80211_sta_flag_update *sta_flags;
1834
1835         static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
1836                 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32    },
1837                 [NL80211_STA_INFO_RX_PACKETS]    = { .type = NLA_U32    },
1838                 [NL80211_STA_INFO_TX_PACKETS]    = { .type = NLA_U32    },
1839                 [NL80211_STA_INFO_RX_BITRATE]    = { .type = NLA_NESTED },
1840                 [NL80211_STA_INFO_TX_BITRATE]    = { .type = NLA_NESTED },
1841                 [NL80211_STA_INFO_SIGNAL]        = { .type = NLA_U8     },
1842                 [NL80211_STA_INFO_SIGNAL_AVG]    = { .type = NLA_U8     },
1843                 [NL80211_STA_INFO_RX_BYTES]      = { .type = NLA_U32    },
1844                 [NL80211_STA_INFO_TX_BYTES]      = { .type = NLA_U32    },
1845                 [NL80211_STA_INFO_TX_RETRIES]    = { .type = NLA_U32    },
1846                 [NL80211_STA_INFO_TX_FAILED]     = { .type = NLA_U32    },
1847                 [NL80211_STA_INFO_CONNECTED_TIME]= { .type = NLA_U32    },
1848                 [NL80211_STA_INFO_RX_DROP_MISC]  = { .type = NLA_U64    },
1849                 [NL80211_STA_INFO_T_OFFSET]      = { .type = NLA_U64    },
1850                 [NL80211_STA_INFO_STA_FLAGS] =
1851                         { .minlen = sizeof(struct nl80211_sta_flag_update) },
1852                 [NL80211_STA_INFO_EXPECTED_THROUGHPUT]   = { .type = NLA_U32    },
1853                 /* mesh */
1854                 [NL80211_STA_INFO_LLID]          = { .type = NLA_U16    },
1855                 [NL80211_STA_INFO_PLID]          = { .type = NLA_U16    },
1856                 [NL80211_STA_INFO_PLINK_STATE]   = { .type = NLA_U8     },
1857                 [NL80211_STA_INFO_LOCAL_PM]      = { .type = NLA_U32    },
1858                 [NL80211_STA_INFO_PEER_PM]       = { .type = NLA_U32    },
1859                 [NL80211_STA_INFO_NONPEER_PM]    = { .type = NLA_U32    },
1860         };
1861
1862         static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
1863                 [NL80211_RATE_INFO_BITRATE]      = { .type = NLA_U16    },
1864                 [NL80211_RATE_INFO_MCS]          = { .type = NLA_U8     },
1865                 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG   },
1866                 [NL80211_RATE_INFO_SHORT_GI]     = { .type = NLA_FLAG   },
1867         };
1868
1869         /* advance to end of array */
1870         e += arr->count;
1871         memset(e, 0, sizeof(*e));
1872
1873         if (attr[NL80211_ATTR_MAC])
1874                 memcpy(e->mac, nla_data(attr[NL80211_ATTR_MAC]), 6);
1875
1876         if (attr[NL80211_ATTR_STA_INFO] &&
1877             !nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
1878                               attr[NL80211_ATTR_STA_INFO], stats_policy))
1879         {
1880                 if (sinfo[NL80211_STA_INFO_SIGNAL])
1881                         e->signal = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
1882
1883                 if (sinfo[NL80211_STA_INFO_SIGNAL_AVG])
1884                         e->signal_avg = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL_AVG]);
1885
1886                 if (sinfo[NL80211_STA_INFO_INACTIVE_TIME])
1887                         e->inactive = nla_get_u32(sinfo[NL80211_STA_INFO_INACTIVE_TIME]);
1888
1889                 if (sinfo[NL80211_STA_INFO_CONNECTED_TIME])
1890                         e->connected_time = nla_get_u32(sinfo[NL80211_STA_INFO_CONNECTED_TIME]);
1891
1892                 if (sinfo[NL80211_STA_INFO_RX_PACKETS])
1893                         e->rx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_RX_PACKETS]);
1894
1895                 if (sinfo[NL80211_STA_INFO_TX_PACKETS])
1896                         e->tx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_TX_PACKETS]);
1897
1898                 if (sinfo[NL80211_STA_INFO_RX_BITRATE] &&
1899                     !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
1900                                       sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy))
1901                         nl80211_parse_rateinfo(rinfo, &e->rx_rate);
1902
1903                 if (sinfo[NL80211_STA_INFO_TX_BITRATE] &&
1904                     !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
1905                                       sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy))
1906                         nl80211_parse_rateinfo(rinfo, &e->tx_rate);
1907
1908                 if (sinfo[NL80211_STA_INFO_RX_BYTES])
1909                         e->rx_bytes = nla_get_u32(sinfo[NL80211_STA_INFO_RX_BYTES]);
1910
1911                 if (sinfo[NL80211_STA_INFO_TX_BYTES])
1912                         e->tx_bytes = nla_get_u32(sinfo[NL80211_STA_INFO_TX_BYTES]);
1913
1914                 if (sinfo[NL80211_STA_INFO_TX_RETRIES])
1915                         e->tx_retries = nla_get_u32(sinfo[NL80211_STA_INFO_TX_RETRIES]);
1916
1917                 if (sinfo[NL80211_STA_INFO_TX_FAILED])
1918                         e->tx_failed = nla_get_u32(sinfo[NL80211_STA_INFO_TX_FAILED]);
1919
1920                 if (sinfo[NL80211_STA_INFO_T_OFFSET])
1921                         e->t_offset = nla_get_u64(sinfo[NL80211_STA_INFO_T_OFFSET]);
1922
1923                 if (sinfo[NL80211_STA_INFO_RX_DROP_MISC])
1924                         e->rx_drop_misc = nla_get_u64(sinfo[NL80211_STA_INFO_RX_DROP_MISC]);
1925
1926                 if (sinfo[NL80211_STA_INFO_EXPECTED_THROUGHPUT])
1927                         e->thr = nla_get_u32(sinfo[NL80211_STA_INFO_EXPECTED_THROUGHPUT]);
1928
1929                 /* mesh */
1930                 if (sinfo[NL80211_STA_INFO_LLID])
1931                         e->llid = nla_get_u16(sinfo[NL80211_STA_INFO_LLID]);
1932
1933                 if (sinfo[NL80211_STA_INFO_PLID])
1934                         e->plid = nla_get_u16(sinfo[NL80211_STA_INFO_PLID]);
1935
1936                 if (sinfo[NL80211_STA_INFO_PLINK_STATE])
1937                         plink_state_to_str(e->plink_state,
1938                                 nla_get_u8(sinfo[NL80211_STA_INFO_PLINK_STATE]));
1939
1940                 if (sinfo[NL80211_STA_INFO_LOCAL_PM])
1941                         power_mode_to_str(e->local_ps, sinfo[NL80211_STA_INFO_LOCAL_PM]);
1942                 if (sinfo[NL80211_STA_INFO_PEER_PM])
1943                         power_mode_to_str(e->peer_ps, sinfo[NL80211_STA_INFO_PEER_PM]);
1944                 if (sinfo[NL80211_STA_INFO_NONPEER_PM])
1945                         power_mode_to_str(e->nonpeer_ps, sinfo[NL80211_STA_INFO_NONPEER_PM]);
1946
1947                 /* Station flags */
1948                 if (sinfo[NL80211_STA_INFO_STA_FLAGS])
1949                 {
1950                         sta_flags = (struct nl80211_sta_flag_update *)
1951                                 nla_data(sinfo[NL80211_STA_INFO_STA_FLAGS]);
1952
1953                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_AUTHORIZED) &&
1954                             sta_flags->set & BIT(NL80211_STA_FLAG_AUTHORIZED))
1955                                 e->is_authorized = 1;
1956
1957                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_AUTHENTICATED) &&
1958                             sta_flags->set & BIT(NL80211_STA_FLAG_AUTHENTICATED))
1959                                 e->is_authenticated = 1;
1960
1961                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) &&
1962                             sta_flags->set & BIT(NL80211_STA_FLAG_SHORT_PREAMBLE))
1963                                 e->is_preamble_short = 1;
1964
1965                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_WME) &&
1966                             sta_flags->set & BIT(NL80211_STA_FLAG_WME))
1967                                 e->is_wme = 1;
1968
1969                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_MFP) &&
1970                             sta_flags->set & BIT(NL80211_STA_FLAG_MFP))
1971                                 e->is_mfp = 1;
1972
1973                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_TDLS_PEER) &&
1974                             sta_flags->set & BIT(NL80211_STA_FLAG_TDLS_PEER))
1975                                 e->is_tdls = 1;
1976                 }
1977         }
1978
1979         e->noise = 0; /* filled in by caller */
1980         arr->count++;
1981
1982         return NL_SKIP;
1983 }
1984
1985 static int nl80211_get_survey(const char *ifname, char *buf, int *len)
1986 {
1987         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
1988         int rc;
1989
1990         rc = nl80211_request(ifname, NL80211_CMD_GET_SURVEY,
1991                         NLM_F_DUMP, nl80211_get_survey_cb, &arr);
1992         if (!rc)
1993                 *len = (arr.count * sizeof(struct iwinfo_survey_entry));
1994         else
1995                 *len = 0;
1996
1997         return 0;
1998 }
1999
2000 static int nl80211_get_assoclist(const char *ifname, char *buf, int *len)
2001 {
2002         DIR *d;
2003         int i, noise = 0;
2004         struct dirent *de;
2005         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
2006         struct iwinfo_assoclist_entry *e;
2007
2008         if ((d = opendir("/sys/class/net")) != NULL)
2009         {
2010                 while ((de = readdir(d)) != NULL)
2011                 {
2012                         if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
2013                             (!de->d_name[strlen(ifname)] ||
2014                              !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
2015                         {
2016                                 nl80211_request(de->d_name, NL80211_CMD_GET_STATION,
2017                                                 NLM_F_DUMP, nl80211_get_assoclist_cb, &arr);
2018                         }
2019                 }
2020
2021                 closedir(d);
2022
2023                 if (!nl80211_get_noise(ifname, &noise))
2024                         for (i = 0, e = arr.buf; i < arr.count; i++, e++)
2025                                 e->noise = noise;
2026
2027                 *len = (arr.count * sizeof(struct iwinfo_assoclist_entry));
2028                 return 0;
2029         }
2030
2031         return -1;
2032 }
2033
2034 static int nl80211_get_txpwrlist_cb(struct nl_msg *msg, void *arg)
2035 {
2036         int *dbm_max = arg;
2037         int ch_cur, ch_cmp, bands_remain, freqs_remain;
2038
2039         struct nlattr **attr = nl80211_parse(msg);
2040         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
2041         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
2042         struct nlattr *band, *freq;
2043
2044         static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
2045                 [NL80211_FREQUENCY_ATTR_FREQ]         = { .type = NLA_U32  },
2046                 [NL80211_FREQUENCY_ATTR_DISABLED]     = { .type = NLA_FLAG },
2047                 [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
2048                 [NL80211_FREQUENCY_ATTR_NO_IBSS]      = { .type = NLA_FLAG },
2049                 [NL80211_FREQUENCY_ATTR_RADAR]        = { .type = NLA_FLAG },
2050                 [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32  },
2051         };
2052
2053         ch_cur = *dbm_max; /* value int* is initialized with channel by caller */
2054         *dbm_max = -1;
2055
2056         nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
2057         {
2058                 nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
2059                           nla_len(band), NULL);
2060
2061                 nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
2062                 {
2063                         nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
2064                                   nla_data(freq), nla_len(freq), freq_policy);
2065
2066                         ch_cmp = nl80211_freq2channel(nla_get_u32(
2067                                 freqs[NL80211_FREQUENCY_ATTR_FREQ]));
2068
2069                         if ((!ch_cur || (ch_cmp == ch_cur)) &&
2070                             freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER])
2071                         {
2072                                 *dbm_max = (int)(0.01 * nla_get_u32(
2073                                         freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]));
2074
2075                                 break;
2076                         }
2077                 }
2078         }
2079
2080         return NL_SKIP;
2081 }
2082
2083 static int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len)
2084 {
2085         int err, ch_cur;
2086         int dbm_max = -1, dbm_cur, dbm_cnt;
2087         struct nl80211_msg_conveyor *req;
2088         struct iwinfo_txpwrlist_entry entry;
2089
2090         if (nl80211_get_channel(ifname, &ch_cur))
2091                 ch_cur = 0;
2092
2093         /* initialize the value pointer with channel for callback */
2094         dbm_max = ch_cur;
2095
2096         err = nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
2097                               nl80211_get_txpwrlist_cb, &dbm_max);
2098
2099         if (!err)
2100         {
2101                 for (dbm_cur = 0, dbm_cnt = 0;
2102                      dbm_cur < dbm_max;
2103                      dbm_cur++, dbm_cnt++)
2104                 {
2105                         entry.dbm = dbm_cur;
2106                         entry.mw  = iwinfo_dbm2mw(dbm_cur);
2107
2108                         memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
2109                 }
2110
2111                 entry.dbm = dbm_max;
2112                 entry.mw  = iwinfo_dbm2mw(dbm_max);
2113
2114                 memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
2115                 dbm_cnt++;
2116
2117                 *len = dbm_cnt * sizeof(entry);
2118                 return 0;
2119         }
2120
2121         return -1;
2122 }
2123
2124 static void nl80211_get_scancrypto(const char *spec,
2125         struct iwinfo_crypto_entry *c)
2126 {
2127         if (strstr(spec, "WPA") || strstr(spec, "WEP"))
2128         {
2129                 c->enabled = 1;
2130
2131                 if (strstr(spec, "WPA2-") && strstr(spec, "WPA-"))
2132                         c->wpa_version = 3;
2133
2134                 else if (strstr(spec, "WPA2"))
2135                         c->wpa_version = 2;
2136
2137                 else if (strstr(spec, "WPA"))
2138                         c->wpa_version = 1;
2139
2140                 else if (strstr(spec, "WEP"))
2141                         c->auth_algs = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
2142
2143
2144                 if (strstr(spec, "PSK"))
2145                         c->auth_suites |= IWINFO_KMGMT_PSK;
2146
2147                 if (strstr(spec, "802.1X") || strstr(spec, "EAP"))
2148                         c->auth_suites |= IWINFO_KMGMT_8021x;
2149
2150                 if (strstr(spec, "WPA-NONE"))
2151                         c->auth_suites |= IWINFO_KMGMT_NONE;
2152
2153
2154                 if (strstr(spec, "TKIP"))
2155                         c->pair_ciphers |= IWINFO_CIPHER_TKIP;
2156
2157                 if (strstr(spec, "CCMP"))
2158                         c->pair_ciphers |= IWINFO_CIPHER_CCMP;
2159
2160                 if (strstr(spec, "WEP-40"))
2161                         c->pair_ciphers |= IWINFO_CIPHER_WEP40;
2162
2163                 if (strstr(spec, "WEP-104"))
2164                         c->pair_ciphers |= IWINFO_CIPHER_WEP104;
2165
2166                 c->group_ciphers = c->pair_ciphers;
2167         }
2168         else
2169         {
2170                 c->enabled = 0;
2171         }
2172 }
2173
2174
2175 struct nl80211_scanlist {
2176         struct iwinfo_scanlist_entry *e;
2177         int len;
2178 };
2179
2180
2181 static void nl80211_get_scanlist_ie(struct nlattr **bss,
2182                                     struct iwinfo_scanlist_entry *e)
2183 {
2184         int ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
2185         unsigned char *ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
2186         static unsigned char ms_oui[3] = { 0x00, 0x50, 0xf2 };
2187         int len;
2188
2189         while (ielen >= 2 && ielen >= ie[1])
2190         {
2191                 switch (ie[0])
2192                 {
2193                 case 0: /* SSID */
2194                 case 114: /* Mesh ID */
2195                         if (e->ssid[0] == 0) {
2196                                 len = min(ie[1], IWINFO_ESSID_MAX_SIZE);
2197                                 memcpy(e->ssid, ie + 2, len);
2198                                 e->ssid[len] = 0;
2199                         }
2200                         break;
2201
2202                 case 48: /* RSN */
2203                         iwinfo_parse_rsn(&e->crypto, ie + 2, ie[1],
2204                                          IWINFO_CIPHER_CCMP, IWINFO_KMGMT_8021x);
2205                         break;
2206
2207                 case 221: /* Vendor */
2208                         if (ie[1] >= 4 && !memcmp(ie + 2, ms_oui, 3) && ie[5] == 1)
2209                                 iwinfo_parse_rsn(&e->crypto, ie + 6, ie[1] - 4,
2210                                                  IWINFO_CIPHER_TKIP, IWINFO_KMGMT_PSK);
2211                         break;
2212                 }
2213
2214                 ielen -= ie[1] + 2;
2215                 ie += ie[1] + 2;
2216         }
2217 }
2218
2219 static int nl80211_get_scanlist_cb(struct nl_msg *msg, void *arg)
2220 {
2221         int8_t rssi;
2222         uint16_t caps;
2223
2224         struct nl80211_scanlist *sl = arg;
2225         struct nlattr **tb = nl80211_parse(msg);
2226         struct nlattr *bss[NL80211_BSS_MAX + 1];
2227
2228         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
2229                 [NL80211_BSS_TSF]                  = { .type = NLA_U64 },
2230                 [NL80211_BSS_FREQUENCY]            = { .type = NLA_U32 },
2231                 [NL80211_BSS_BSSID]                = { 0 },
2232                 [NL80211_BSS_BEACON_INTERVAL]      = { .type = NLA_U16 },
2233                 [NL80211_BSS_CAPABILITY]           = { .type = NLA_U16 },
2234                 [NL80211_BSS_INFORMATION_ELEMENTS] = { 0 },
2235                 [NL80211_BSS_SIGNAL_MBM]           = { .type = NLA_U32 },
2236                 [NL80211_BSS_SIGNAL_UNSPEC]        = { .type = NLA_U8  },
2237                 [NL80211_BSS_STATUS]               = { .type = NLA_U32 },
2238                 [NL80211_BSS_SEEN_MS_AGO]          = { .type = NLA_U32 },
2239                 [NL80211_BSS_BEACON_IES]           = { 0 },
2240         };
2241
2242         if (!tb[NL80211_ATTR_BSS] ||
2243                 nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
2244                                  bss_policy) ||
2245                 !bss[NL80211_BSS_BSSID])
2246         {
2247                 return NL_SKIP;
2248         }
2249
2250         if (bss[NL80211_BSS_CAPABILITY])
2251                 caps = nla_get_u16(bss[NL80211_BSS_CAPABILITY]);
2252         else
2253                 caps = 0;
2254
2255         memset(sl->e, 0, sizeof(*sl->e));
2256         memcpy(sl->e->mac, nla_data(bss[NL80211_BSS_BSSID]), 6);
2257
2258         if (caps & (1<<1))
2259                 sl->e->mode = IWINFO_OPMODE_ADHOC;
2260         else if (caps & (1<<0))
2261                 sl->e->mode = IWINFO_OPMODE_MASTER;
2262         else
2263                 sl->e->mode = IWINFO_OPMODE_MESHPOINT;
2264
2265         if (caps & (1<<4))
2266                 sl->e->crypto.enabled = 1;
2267
2268         if (bss[NL80211_BSS_FREQUENCY])
2269                 sl->e->channel = nl80211_freq2channel(nla_get_u32(
2270                         bss[NL80211_BSS_FREQUENCY]));
2271
2272         if (bss[NL80211_BSS_INFORMATION_ELEMENTS])
2273                 nl80211_get_scanlist_ie(bss, sl->e);
2274
2275         if (bss[NL80211_BSS_SIGNAL_MBM])
2276         {
2277                 sl->e->signal =
2278                         (uint8_t)((int32_t)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100);
2279
2280                 rssi = sl->e->signal - 0x100;
2281
2282                 if (rssi < -110)
2283                         rssi = -110;
2284                 else if (rssi > -40)
2285                         rssi = -40;
2286
2287                 sl->e->quality = (rssi + 110);
2288                 sl->e->quality_max = 70;
2289         }
2290
2291         if (sl->e->crypto.enabled && !sl->e->crypto.wpa_version)
2292         {
2293                 sl->e->crypto.auth_algs    = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
2294                 sl->e->crypto.pair_ciphers = IWINFO_CIPHER_WEP40 | IWINFO_CIPHER_WEP104;
2295         }
2296
2297         sl->e++;
2298         sl->len++;
2299
2300         return NL_SKIP;
2301 }
2302
2303 static int nl80211_get_scanlist_nl(const char *ifname, char *buf, int *len)
2304 {
2305         struct nl80211_scanlist sl = { .e = (struct iwinfo_scanlist_entry *)buf };
2306
2307         if (nl80211_request(ifname, NL80211_CMD_TRIGGER_SCAN, 0, NULL, NULL))
2308                 goto out;
2309
2310         if (nl80211_wait("nl80211", "scan",
2311                          NL80211_CMD_NEW_SCAN_RESULTS, NL80211_CMD_SCAN_ABORTED))
2312                 goto out;
2313
2314         if (nl80211_request(ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
2315                             nl80211_get_scanlist_cb, &sl))
2316                 goto out;
2317
2318         *len = sl.len * sizeof(struct iwinfo_scanlist_entry);
2319         return 0;
2320
2321 out:
2322         *len = 0;
2323         return -1;
2324 }
2325
2326 static int wpasupp_ssid_decode(const char *in, char *out, int outlen)
2327 {
2328 #define hex(x) \
2329         (((x) >= 'a') ? ((x) - 'a' + 10) : \
2330                 (((x) >= 'A') ? ((x) - 'A' + 10) : ((x) - '0')))
2331
2332         int len = 0;
2333
2334         while (*in)
2335         {
2336                 if (len + 1 >= outlen)
2337                         break;
2338
2339                 switch (*in)
2340                 {
2341                 case '\\':
2342                         in++;
2343                         switch (*in)
2344                         {
2345                         case 'n':
2346                                 out[len++] = '\n'; in++;
2347                                 break;
2348
2349                         case 'r':
2350                                 out[len++] = '\r'; in++;
2351                                 break;
2352
2353                         case 't':
2354                                 out[len++] = '\t'; in++;
2355                                 break;
2356
2357                         case 'e':
2358                                 out[len++] = '\033'; in++;
2359                                 break;
2360
2361                         case 'x':
2362                                 if (isxdigit(*(in+1)) && isxdigit(*(in+2)))
2363                                         out[len++] = hex(*(in+1)) * 16 + hex(*(in+2));
2364                                 in += 3;
2365                                 break;
2366
2367                         default:
2368                                 out[len++] = *in++;
2369                                 break;
2370                         }
2371                         break;
2372
2373                 default:
2374                         out[len++] = *in++;
2375                         break;
2376                 }
2377         }
2378
2379         if (outlen > len)
2380                 out[len] = '\0';
2381
2382         return len;
2383 }
2384
2385 static int nl80211_get_scanlist_wpactl(const char *ifname, char *buf, int *len)
2386 {
2387         int sock, qmax, rssi, tries, count = -1, ready = 0;
2388         char *pos, *line, *bssid, *freq, *signal, *flags, *ssid, reply[4096];
2389         struct sockaddr_un local = { 0 };
2390         struct iwinfo_scanlist_entry *e = (struct iwinfo_scanlist_entry *)buf;
2391
2392         sock = nl80211_wpactl_connect(ifname, &local);
2393
2394         if (sock < 0)
2395                 return sock;
2396
2397         send(sock, "ATTACH", 6, 0);
2398         send(sock, "SCAN", 4, 0);
2399
2400         /*
2401          * wait for scan results:
2402          *   nl80211_wpactl_recv() will use a timeout of 256ms and we need to scan
2403          *   72 channels at most. We'll also receive two "OK" messages acknowledging
2404          *   the "ATTACH" and "SCAN" commands and the driver might need a bit extra
2405          *   time to process the results, so try 72 + 2 + 1 times.
2406          */
2407         for (tries = 0; tries < 75; tries++)
2408         {
2409                 if (nl80211_wpactl_recv(sock, reply, sizeof(reply)) <= 0)
2410                         continue;
2411
2412                 /* got an event notification */
2413                 if (reply[0] == '<')
2414                 {
2415                         /* scan results are ready */
2416                         if (strstr(reply, "CTRL-EVENT-SCAN-RESULTS"))
2417                         {
2418                                 /* send "SCAN_RESULTS" command */
2419                                 ready = (send(sock, "SCAN_RESULTS", 12, 0) == 12);
2420                                 break;
2421                         }
2422
2423                         /* is another unrelated event, retry */
2424                         tries--;
2425                 }
2426
2427                 /* got a failure reply */
2428                 else if (!strcmp(reply, "FAIL-BUSY\n"))
2429                 {
2430                         break;
2431                 }
2432         }
2433
2434         /* receive and parse scan results if the wait above didn't time out */
2435         while (ready && nl80211_wpactl_recv(sock, reply, sizeof(reply)) > 0)
2436         {
2437                 /* received an event notification, receive again */
2438                 if (reply[0] == '<')
2439                         continue;
2440
2441                 nl80211_get_quality_max(ifname, &qmax);
2442
2443                 for (line = strtok_r(reply, "\n", &pos);
2444                      line != NULL;
2445                      line = strtok_r(NULL, "\n", &pos))
2446                 {
2447                         /* skip header line */
2448                         if (count < 0)
2449                         {
2450                                 count++;
2451                                 continue;
2452                         }
2453
2454                         bssid  = strtok(line, "\t");
2455                         freq   = strtok(NULL, "\t");
2456                         signal = strtok(NULL, "\t");
2457                         flags  = strtok(NULL, "\t");
2458                         ssid   = strtok(NULL, "\n");
2459
2460                         if (!bssid || !freq || !signal || !flags || !ssid)
2461                                 continue;
2462
2463                         /* BSSID */
2464                         e->mac[0] = strtol(&bssid[0],  NULL, 16);
2465                         e->mac[1] = strtol(&bssid[3],  NULL, 16);
2466                         e->mac[2] = strtol(&bssid[6],  NULL, 16);
2467                         e->mac[3] = strtol(&bssid[9],  NULL, 16);
2468                         e->mac[4] = strtol(&bssid[12], NULL, 16);
2469                         e->mac[5] = strtol(&bssid[15], NULL, 16);
2470
2471                         /* SSID */
2472                         wpasupp_ssid_decode(ssid, e->ssid, sizeof(e->ssid));
2473
2474                         /* Mode */
2475                         if (strstr(flags, "[MESH]"))
2476                                 e->mode = IWINFO_OPMODE_MESHPOINT;
2477                         else if (strstr(flags, "[IBSS]"))
2478                                 e->mode = IWINFO_OPMODE_ADHOC;
2479                         else
2480                                 e->mode = IWINFO_OPMODE_MASTER;
2481
2482                         /* Channel */
2483                         e->channel = nl80211_freq2channel(atoi(freq));
2484
2485                         /* Signal */
2486                         rssi = atoi(signal);
2487                         e->signal = rssi;
2488
2489                         /* Quality */
2490                         if (rssi < 0)
2491                         {
2492                                 /* The cfg80211 wext compat layer assumes a signal range
2493                                  * of -110 dBm to -40 dBm, the quality value is derived
2494                                  * by adding 110 to the signal level */
2495                                 if (rssi < -110)
2496                                         rssi = -110;
2497                                 else if (rssi > -40)
2498                                         rssi = -40;
2499
2500                                 e->quality = (rssi + 110);
2501                         }
2502                         else
2503                         {
2504                                 e->quality = rssi;
2505                         }
2506
2507                         /* Max. Quality */
2508                         e->quality_max = qmax;
2509
2510                         /* Crypto */
2511                         nl80211_get_scancrypto(flags, &e->crypto);
2512
2513                         count++;
2514                         e++;
2515                 }
2516
2517                 *len = count * sizeof(struct iwinfo_scanlist_entry);
2518                 break;
2519         }
2520
2521         close(sock);
2522         unlink(local.sun_path);
2523
2524         return (count >= 0) ? 0 : -1;
2525 }
2526
2527 static int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
2528 {
2529         char *res;
2530         int rv, mode;
2531
2532         *len = 0;
2533
2534         /* Got a radioX pseudo interface, find some interface on it or create one */
2535         if (!strncmp(ifname, "radio", 5))
2536         {
2537                 /* Reuse existing interface */
2538                 if ((res = nl80211_phy2ifname(ifname)) != NULL)
2539                 {
2540                         return nl80211_get_scanlist(res, buf, len);
2541                 }
2542
2543                 /* Need to spawn a temporary iface for scanning */
2544                 else if ((res = nl80211_ifadd(ifname)) != NULL)
2545                 {
2546                         rv = nl80211_get_scanlist(res, buf, len);
2547                         nl80211_ifdel(res);
2548                         return rv;
2549                 }
2550         }
2551
2552         /* WPA supplicant */
2553         if (!nl80211_get_scanlist_wpactl(ifname, buf, len))
2554         {
2555                 return 0;
2556         }
2557
2558         /* station / ad-hoc / monitor scan */
2559         else if (!nl80211_get_mode(ifname, &mode) &&
2560                  (mode == IWINFO_OPMODE_ADHOC ||
2561                   mode == IWINFO_OPMODE_MASTER ||
2562                   mode == IWINFO_OPMODE_CLIENT ||
2563                   mode == IWINFO_OPMODE_MONITOR) &&
2564                  iwinfo_ifup(ifname))
2565         {
2566                 return nl80211_get_scanlist_nl(ifname, buf, len);
2567         }
2568
2569         /* AP scan */
2570         else
2571         {
2572                 /* Got a temp interface, don't create yet another one */
2573                 if (!strncmp(ifname, "tmp.", 4))
2574                 {
2575                         if (!iwinfo_ifup(ifname))
2576                                 return -1;
2577
2578                         rv = nl80211_get_scanlist_nl(ifname, buf, len);
2579                         iwinfo_ifdown(ifname);
2580                         return rv;
2581                 }
2582
2583                 /* Spawn a new scan interface */
2584                 else
2585                 {
2586                         if (!(res = nl80211_ifadd(ifname)))
2587                                 return -1;
2588
2589                         iwinfo_ifmac(res);
2590
2591                         /* if we can take the new interface up, the driver supports an
2592                          * additional interface and there's no need to tear down the ap */
2593                         if (iwinfo_ifup(res))
2594                         {
2595                                 rv = nl80211_get_scanlist_nl(res, buf, len);
2596                                 iwinfo_ifdown(res);
2597                         }
2598
2599                         /* driver cannot create secondary interface, take down ap
2600                          * during scan */
2601                         else if (iwinfo_ifdown(ifname) && iwinfo_ifup(res))
2602                         {
2603                                 rv = nl80211_get_scanlist_nl(res, buf, len);
2604                                 iwinfo_ifdown(res);
2605                                 iwinfo_ifup(ifname);
2606                                 nl80211_hostapd_hup(ifname);
2607                         }
2608
2609                         nl80211_ifdel(res);
2610                         return rv;
2611                 }
2612         }
2613
2614         return -1;
2615 }
2616
2617 static int nl80211_get_freqlist_cb(struct nl_msg *msg, void *arg)
2618 {
2619         int bands_remain, freqs_remain;
2620
2621         struct nl80211_array_buf *arr = arg;
2622         struct iwinfo_freqlist_entry *e;
2623
2624         struct nlattr **attr = nl80211_parse(msg);
2625         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
2626         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
2627         struct nlattr *band, *freq;
2628
2629         e = arr->buf;
2630         e += arr->count;
2631
2632         if (attr[NL80211_ATTR_WIPHY_BANDS]) {
2633                 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
2634                 {
2635                         nla_parse(bands, NL80211_BAND_ATTR_MAX,
2636                                   nla_data(band), nla_len(band), NULL);
2637
2638                         if (bands[NL80211_BAND_ATTR_FREQS]) {
2639                                 nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
2640                                 {
2641                                         nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
2642                                                   nla_data(freq), nla_len(freq), NULL);
2643
2644                                         if (!freqs[NL80211_FREQUENCY_ATTR_FREQ] ||
2645                                             freqs[NL80211_FREQUENCY_ATTR_DISABLED])
2646                                                 continue;
2647
2648                                         e->mhz = nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]);
2649                                         e->channel = nl80211_freq2channel(e->mhz);
2650
2651                                         e->restricted = (
2652                                                 freqs[NL80211_FREQUENCY_ATTR_NO_IR] &&
2653                                                 !freqs[NL80211_FREQUENCY_ATTR_RADAR]
2654                                         ) ? 1 : 0;
2655
2656                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_HT40_MINUS])
2657                                                 e->flags |= IWINFO_FREQ_NO_HT40MINUS;
2658                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_HT40_PLUS])
2659                                                 e->flags |= IWINFO_FREQ_NO_HT40PLUS;
2660                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_80MHZ])
2661                                                 e->flags |= IWINFO_FREQ_NO_80MHZ;
2662                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_160MHZ])
2663                                                 e->flags |= IWINFO_FREQ_NO_160MHZ;
2664                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_20MHZ])
2665                                                 e->flags |= IWINFO_FREQ_NO_20MHZ;
2666                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_10MHZ])
2667                                                 e->flags |= IWINFO_FREQ_NO_10MHZ;
2668
2669                                         e++;
2670                                         arr->count++;
2671                                 }
2672                         }
2673                 }
2674         }
2675
2676         return NL_SKIP;
2677 }
2678
2679 static int nl80211_get_freqlist(const char *ifname, char *buf, int *len)
2680 {
2681         struct nl80211_msg_conveyor *cv;
2682         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
2683         uint32_t features = nl80211_get_protocol_features(ifname);
2684         int flags;
2685
2686         flags = features & NL80211_PROTOCOL_FEATURE_SPLIT_WIPHY_DUMP ? NLM_F_DUMP : 0;
2687         cv = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, flags);
2688         if (!cv)
2689                 goto out;
2690
2691         NLA_PUT_FLAG(cv->msg, NL80211_ATTR_SPLIT_WIPHY_DUMP);
2692         if (nl80211_send(cv, nl80211_get_freqlist_cb, &arr))
2693                 goto out;
2694
2695         *len = arr.count * sizeof(struct iwinfo_freqlist_entry);
2696         return 0;
2697
2698 nla_put_failure:
2699         nl80211_free(cv);
2700 out:
2701         *len = 0;
2702         return -1;
2703 }
2704
2705 static int nl80211_get_country_cb(struct nl_msg *msg, void *arg)
2706 {
2707         char *buf = arg;
2708         struct nlattr **attr = nl80211_parse(msg);
2709
2710         if (attr[NL80211_ATTR_REG_ALPHA2])
2711                 memcpy(buf, nla_data(attr[NL80211_ATTR_REG_ALPHA2]), 2);
2712         else
2713                 buf[0] = 0;
2714
2715         return NL_SKIP;
2716 }
2717
2718 static int nl80211_get_country(const char *ifname, char *buf)
2719 {
2720         if (nl80211_request(ifname, NL80211_CMD_GET_REG, 0,
2721                             nl80211_get_country_cb, buf))
2722                 return -1;
2723
2724         return 0;
2725 }
2726
2727 static int nl80211_get_countrylist(const char *ifname, char *buf, int *len)
2728 {
2729         int count;
2730         struct iwinfo_country_entry *e = (struct iwinfo_country_entry *)buf;
2731         const struct iwinfo_iso3166_label *l;
2732
2733         for (l = IWINFO_ISO3166_NAMES, count = 0; l->iso3166; l++, e++, count++)
2734         {
2735                 e->iso3166 = l->iso3166;
2736                 e->ccode[0] = (l->iso3166 / 256);
2737                 e->ccode[1] = (l->iso3166 % 256);
2738                 e->ccode[2] = 0;
2739         }
2740
2741         *len = (count * sizeof(struct iwinfo_country_entry));
2742         return 0;
2743 }
2744
2745
2746 struct nl80211_modes
2747 {
2748         bool ok;
2749         uint32_t hw;
2750         uint32_t ht;
2751 };
2752
2753 static int nl80211_get_modelist_cb(struct nl_msg *msg, void *arg)
2754 {
2755         struct nl80211_modes *m = arg;
2756         int bands_remain, freqs_remain;
2757         uint16_t caps = 0;
2758         uint32_t vht_caps = 0;
2759         struct nlattr **attr = nl80211_parse(msg);
2760         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
2761         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
2762         struct nlattr *band, *freq;
2763
2764         if (attr[NL80211_ATTR_WIPHY_BANDS])
2765         {
2766                 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
2767                 {
2768                         nla_parse(bands, NL80211_BAND_ATTR_MAX,
2769                                   nla_data(band), nla_len(band), NULL);
2770
2771                         if (bands[NL80211_BAND_ATTR_HT_CAPA])
2772                                 caps = nla_get_u16(bands[NL80211_BAND_ATTR_HT_CAPA]);
2773
2774                         /* Treat any nonzero capability as 11n */
2775                         if (caps > 0)
2776                         {
2777                                 m->hw |= IWINFO_80211_N;
2778                                 m->ht |= IWINFO_HTMODE_HT20;
2779
2780                                 if (caps & (1 << 1))
2781                                         m->ht |= IWINFO_HTMODE_HT40;
2782                         }
2783
2784                         nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS],
2785                                             freqs_remain)
2786                         {
2787                                 nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
2788                                           nla_data(freq), nla_len(freq), NULL);
2789
2790                                 if (!freqs[NL80211_FREQUENCY_ATTR_FREQ])
2791                                         continue;
2792
2793                                 if (nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]) < 2485)
2794                                 {
2795                                         m->hw |= IWINFO_80211_B;
2796                                         m->hw |= IWINFO_80211_G;
2797                                 }
2798                                 else if (bands[NL80211_BAND_ATTR_VHT_CAPA])
2799                                 {
2800                                         vht_caps = nla_get_u32(bands[NL80211_BAND_ATTR_VHT_CAPA]);
2801
2802                                         /* Treat any nonzero capability as 11ac */
2803                                         if (vht_caps > 0)
2804                                         {
2805                                                 m->hw |= IWINFO_80211_AC;
2806                                                 m->ht |= IWINFO_HTMODE_VHT20 | IWINFO_HTMODE_VHT40 | IWINFO_HTMODE_VHT80;
2807
2808                                                 switch ((vht_caps >> 2) & 3)
2809                                                 {
2810                                                 case 2:
2811                                                         m->ht |= IWINFO_HTMODE_VHT80_80;
2812                                                         /* fall through */
2813
2814                                                 case 1:
2815                                                         m->ht |= IWINFO_HTMODE_VHT160;
2816                                                 }
2817                                         }
2818                                 }
2819                                 else if (nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]) >= 56160)
2820                                 {
2821                                         m->hw |= IWINFO_80211_AD;
2822                                 }
2823                                 else if (!(m->hw & IWINFO_80211_AC))
2824                                 {
2825                                         m->hw |= IWINFO_80211_A;
2826                                 }
2827                         }
2828                 }
2829
2830                 m->ok = 1;
2831         }
2832
2833         return NL_SKIP;
2834 }
2835
2836 static int nl80211_get_hwmodelist(const char *ifname, int *buf)
2837 {
2838         struct nl80211_modes m = { 0 };
2839
2840         if (nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
2841                             nl80211_get_modelist_cb, &m))
2842                 goto out;
2843
2844         if (!m.ok)
2845                 goto out;
2846
2847         *buf = m.hw;
2848         return 0;
2849
2850 out:
2851         *buf = 0;
2852         return -1;
2853 }
2854
2855 static int nl80211_get_htmodelist(const char *ifname, int *buf)
2856 {
2857         struct nl80211_modes m = { 0 };
2858
2859         if (nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
2860                             nl80211_get_modelist_cb, &m))
2861                 goto out;
2862
2863         if (!m.ok)
2864                 goto out;
2865
2866         *buf = m.ht;
2867         return 0;
2868
2869 out:
2870         *buf = 0;
2871         return -1;
2872 }
2873
2874
2875 static int nl80211_get_ifcomb_cb(struct nl_msg *msg, void *arg)
2876 {
2877         struct nlattr **attr = nl80211_parse(msg);
2878         struct nlattr *comb;
2879         int *ret = arg;
2880         int comb_rem, limit_rem, mode_rem;
2881
2882         *ret = 0;
2883         if (!attr[NL80211_ATTR_INTERFACE_COMBINATIONS])
2884                 return NL_SKIP;
2885
2886         nla_for_each_nested(comb, attr[NL80211_ATTR_INTERFACE_COMBINATIONS], comb_rem)
2887         {
2888                 static struct nla_policy iface_combination_policy[NUM_NL80211_IFACE_COMB] = {
2889                         [NL80211_IFACE_COMB_LIMITS] = { .type = NLA_NESTED },
2890                         [NL80211_IFACE_COMB_MAXNUM] = { .type = NLA_U32 },
2891                 };
2892                 struct nlattr *tb_comb[NUM_NL80211_IFACE_COMB+1];
2893                 static struct nla_policy iface_limit_policy[NUM_NL80211_IFACE_LIMIT] = {
2894                         [NL80211_IFACE_LIMIT_TYPES] = { .type = NLA_NESTED },
2895                         [NL80211_IFACE_LIMIT_MAX] = { .type = NLA_U32 },
2896                 };
2897                 struct nlattr *tb_limit[NUM_NL80211_IFACE_LIMIT+1];
2898                 struct nlattr *limit;
2899
2900                 nla_parse_nested(tb_comb, NUM_NL80211_IFACE_COMB, comb, iface_combination_policy);
2901
2902                 if (!tb_comb[NL80211_IFACE_COMB_LIMITS])
2903                         continue;
2904
2905                 nla_for_each_nested(limit, tb_comb[NL80211_IFACE_COMB_LIMITS], limit_rem)
2906                 {
2907                         struct nlattr *mode;
2908
2909                         nla_parse_nested(tb_limit, NUM_NL80211_IFACE_LIMIT, limit, iface_limit_policy);
2910
2911                         if (!tb_limit[NL80211_IFACE_LIMIT_TYPES] ||
2912                             !tb_limit[NL80211_IFACE_LIMIT_MAX])
2913                                 continue;
2914
2915                         if (nla_get_u32(tb_limit[NL80211_IFACE_LIMIT_MAX]) < 2)
2916                                 continue;
2917
2918                         nla_for_each_nested(mode, tb_limit[NL80211_IFACE_LIMIT_TYPES], mode_rem) {
2919                                 if (nla_type(mode) == NL80211_IFTYPE_AP)
2920                                         *ret = 1;
2921                         }
2922                 }
2923         }
2924
2925         return NL_SKIP;
2926 }
2927
2928 static int nl80211_get_mbssid_support(const char *ifname, int *buf)
2929 {
2930         if (nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
2931                             nl80211_get_ifcomb_cb, buf))
2932                 return -1;
2933
2934         return 0;
2935 }
2936
2937 static int nl80211_get_hardware_id(const char *ifname, char *buf)
2938 {
2939         struct iwinfo_hardware_id *id = (struct iwinfo_hardware_id *)buf;
2940         char *phy, num[8], path[PATH_MAX];
2941         int i;
2942
2943         struct { const char *path; uint16_t *dest; } lookup[] = {
2944                 { "vendor", &id->vendor_id },
2945                 { "device", &id->device_id },
2946                 { "subsystem_vendor", &id->subsystem_vendor_id },
2947                 { "subsystem_device", &id->subsystem_device_id }
2948         };
2949
2950         memset(id, 0, sizeof(*id));
2951
2952         /* Try to determine the phy name from the given interface */
2953         phy = nl80211_ifname2phy(ifname);
2954
2955         for (i = 0; i < ARRAY_SIZE(lookup); i++)
2956         {
2957                 snprintf(path, sizeof(path), "/sys/class/%s/%s/device/%s",
2958                          phy ? "ieee80211" : "net",
2959                          phy ? phy : ifname, lookup[i].path);
2960
2961                 if (nl80211_readstr(path, num, sizeof(num)) > 0)
2962                         *lookup[i].dest = strtoul(num, NULL, 16);
2963         }
2964
2965         /* Failed to obtain hardware IDs, search board config */
2966         if (id->vendor_id == 0 || id->device_id == 0)
2967                 return iwinfo_hardware_id_from_mtd(id);
2968
2969         return 0;
2970 }
2971
2972 static const struct iwinfo_hardware_entry *
2973 nl80211_get_hardware_entry(const char *ifname)
2974 {
2975         struct iwinfo_hardware_id id;
2976
2977         if (nl80211_get_hardware_id(ifname, (char *)&id))
2978                 return NULL;
2979
2980         return iwinfo_hardware(&id);
2981 }
2982
2983 static int nl80211_get_hardware_name(const char *ifname, char *buf)
2984 {
2985         const struct iwinfo_hardware_entry *hw;
2986
2987         if (!(hw = nl80211_get_hardware_entry(ifname)))
2988                 sprintf(buf, "Generic MAC80211");
2989         else
2990                 sprintf(buf, "%s %s", hw->vendor_name, hw->device_name);
2991
2992         return 0;
2993 }
2994
2995 static int nl80211_get_txpower_offset(const char *ifname, int *buf)
2996 {
2997         const struct iwinfo_hardware_entry *hw;
2998
2999         if (!(hw = nl80211_get_hardware_entry(ifname)))
3000                 return -1;
3001
3002         *buf = hw->txpower_offset;
3003         return 0;
3004 }
3005
3006 static int nl80211_get_frequency_offset(const char *ifname, int *buf)
3007 {
3008         const struct iwinfo_hardware_entry *hw;
3009
3010         if (!(hw = nl80211_get_hardware_entry(ifname)))
3011                 return -1;
3012
3013         *buf = hw->frequency_offset;
3014         return 0;
3015 }
3016
3017 static int nl80211_lookup_phyname(const char *section, char *buf)
3018 {
3019         int idx;
3020
3021         if ((idx = nl80211_phy_idx_from_uci(section)) < 0)
3022                 return -1;
3023
3024         sprintf(buf, "phy%d", idx);
3025         return 0;
3026 }
3027
3028 const struct iwinfo_ops nl80211_ops = {
3029         .name             = "nl80211",
3030         .probe            = nl80211_probe,
3031         .channel          = nl80211_get_channel,
3032         .frequency        = nl80211_get_frequency,
3033         .frequency_offset = nl80211_get_frequency_offset,
3034         .txpower          = nl80211_get_txpower,
3035         .txpower_offset   = nl80211_get_txpower_offset,
3036         .bitrate          = nl80211_get_bitrate,
3037         .signal           = nl80211_get_signal,
3038         .noise            = nl80211_get_noise,
3039         .quality          = nl80211_get_quality,
3040         .quality_max      = nl80211_get_quality_max,
3041         .mbssid_support   = nl80211_get_mbssid_support,
3042         .hwmodelist       = nl80211_get_hwmodelist,
3043         .htmodelist       = nl80211_get_htmodelist,
3044         .mode             = nl80211_get_mode,
3045         .ssid             = nl80211_get_ssid,
3046         .bssid            = nl80211_get_bssid,
3047         .country          = nl80211_get_country,
3048         .hardware_id      = nl80211_get_hardware_id,
3049         .hardware_name    = nl80211_get_hardware_name,
3050         .encryption       = nl80211_get_encryption,
3051         .phyname          = nl80211_get_phyname,
3052         .assoclist        = nl80211_get_assoclist,
3053         .txpwrlist        = nl80211_get_txpwrlist,
3054         .scanlist         = nl80211_get_scanlist,
3055         .freqlist         = nl80211_get_freqlist,
3056         .countrylist      = nl80211_get_countrylist,
3057         .survey           = nl80211_get_survey,
3058         .lookup_phy       = nl80211_lookup_phyname,
3059         .close            = nl80211_close
3060 };