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
 429 static int nl80211_subscribe_cb(struct nl_msg *msg, void *arg)
 430 {
 431         struct nl80211_group_conveyor *cv = arg;
 432
 433         struct nlattr **attr = nl80211_parse(msg);
 434         struct nlattr *mgrpinfo[CTRL_ATTR_MCAST_GRP_MAX + 1];
 435         struct nlattr *mgrp;
 436         int mgrpidx;
 437
 438         if (!attr[CTRL_ATTR_MCAST_GROUPS])
 439                 return NL_SKIP;
 440
 441         nla_for_each_nested(mgrp, attr[CTRL_ATTR_MCAST_GROUPS], mgrpidx)
 442         {
 443                 nla_parse(mgrpinfo, CTRL_ATTR_MCAST_GRP_MAX,
 444                           nla_data(mgrp), nla_len(mgrp), NULL);
 445
 446                 if (mgrpinfo[CTRL_ATTR_MCAST_GRP_ID] &&
 447                     mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME] &&
 448                     !strncmp(nla_data(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME]),
 449                              cv->name, nla_len(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME])))
 450                 {
 451                         cv->id = nla_get_u32(mgrpinfo[CTRL_ATTR_MCAST_GRP_ID]);
 452                         break;
 453                 }
 454         }
 455
 456         return NL_SKIP;
 457 }
 458
 459 static int nl80211_subscribe(const char *family, const char *group)
 460 {
 461         struct nl80211_group_conveyor cv = { .name = group, .id = -ENOENT };
 462         struct nl80211_msg_conveyor *req;
 463         int err;
 464
 465         req = nl80211_ctl(CTRL_CMD_GETFAMILY, 0);
 466         if (req)
 467         {
 468                 NLA_PUT_STRING(req->msg, CTRL_ATTR_FAMILY_NAME, family);
 469                 err = nl80211_send(req, nl80211_subscribe_cb, &cv);
 470
 471                 if (err)
 472                         return err;
 473
 474                 return nl_socket_add_membership(nls->nl_sock, cv.id);
 475
 476 nla_put_failure:
 477                 nl80211_free(req);
 478         }
 479
 480         return -ENOMEM;
 481 }
 482
 483
 484 static int nl80211_wait_cb(struct nl_msg *msg, void *arg)
 485 {
 486         struct nl80211_event_conveyor *cv = arg;
 487         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 488
 489         if (gnlh->cmd == cv->wait)
 490                 cv->recv = gnlh->cmd;
 491
 492         return NL_SKIP;
 493 }
 494
 495 static int nl80211_wait_seq_check(struct nl_msg *msg, void *arg)
 496 {
 497         return NL_OK;
 498 }
 499
 500 static int nl80211_wait(const char *family, const char *group, int cmd)
 501 {
 502         struct nl80211_event_conveyor cv = { .wait = cmd };
 503         struct nl_cb *cb;
 504         int err = 0;
 505
 506         if (nl80211_subscribe(family, group))
 507                 return -ENOENT;
 508
 509         cb = nl_cb_alloc(NL_CB_DEFAULT);
 510
 511         if (!cb)
 512                 return -ENOMEM;
 513
 514         nl_cb_err(cb,                  NL_CB_CUSTOM, nl80211_msg_error,      &err);
 515         nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, nl80211_wait_seq_check, NULL);
 516         nl_cb_set(cb, NL_CB_VALID,     NL_CB_CUSTOM, nl80211_wait_cb,        &cv );
 517
 518         while (!cv.recv && !err)
 519                 nl_recvmsgs(nls->nl_sock, cb);
 520
 521         nl_cb_put(cb);
 522
 523         return err;
 524 }
 525
 526
 527 static int nl80211_freq2channel(int freq)
 528 {
 529         if (freq == 2484)
 530                 return 14;
 531         else if (freq < 2484)
 532                 return (freq - 2407) / 5;
 533         else if (freq >= 4910 && freq <= 4980)
 534                 return (freq - 4000) / 5;
 535         else
 536                 return (freq - 5000) / 5;
 537 }
 538
 539 static int nl80211_channel2freq(int channel, const char *band)
 540 {
 541         if (!band || band[0] != 'a')
 542         {
 543                 if (channel == 14)
 544                         return 2484;
 545                 else if (channel < 14)
 546                         return (channel * 5) + 2407;
 547         }
 548         else
 549         {
 550                 if (channel >= 182 && channel <= 196)
 551                         return (channel * 5) + 4000;
 552                 else
 553                         return (channel * 5) + 5000;
 554         }
 555
 556         return 0;
 557 }
 558
 559 static int nl80211_ifname2phy_cb(struct nl_msg *msg, void *arg)
 560 {
 561         char *buf = arg;
 562         struct nlattr **attr = nl80211_parse(msg);
 563
 564         if (attr[NL80211_ATTR_WIPHY_NAME])
 565                 memcpy(buf, nla_data(attr[NL80211_ATTR_WIPHY_NAME]),
 566                        nla_len(attr[NL80211_ATTR_WIPHY_NAME]));
 567         else
 568                 buf[0] = 0;
 569
 570         return NL_SKIP;
 571 }
 572
 573 static char * nl80211_ifname2phy(const char *ifname)
 574 {
 575         static char phy[32] = { 0 };
 576
 577         memset(phy, 0, sizeof(phy));
 578
 579         nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
 580                         nl80211_ifname2phy_cb, phy);
 581
 582         return phy[0] ? phy : NULL;
 583 }
 584
 585 static char * nl80211_phy2ifname(const char *ifname)
 586 {
 587         int ifidx = -1, cifidx = -1, phyidx = -1;
 588         char buffer[64];
 589         static char nif[IFNAMSIZ] = { 0 };
 590
 591         DIR *d;
 592         struct dirent *e;
 593
 594         /* Only accept phy name of the form phy%d or radio%d */
 595         if (!ifname)
 596                 return NULL;
 597         else if (!strncmp(ifname, "phy", 3))
 598                 phyidx = atoi(&ifname[3]);
 599         else if (!strncmp(ifname, "radio", 5))
 600                 phyidx = nl80211_phy_idx_from_uci(ifname);
 601         else
 602                 return NULL;
 603
 604         memset(nif, 0, sizeof(nif));
 605
 606         if (phyidx > -1)
 607         {
 608                 if ((d = opendir("/sys/class/net")) != NULL)
 609                 {
 610                         while ((e = readdir(d)) != NULL)
 611                         {
 612                                 snprintf(buffer, sizeof(buffer),
 613                                          "/sys/class/net/%s/phy80211/index", e->d_name);
 614
 615                                 if (nl80211_readint(buffer) == phyidx)
 616                                 {
 617                                         snprintf(buffer, sizeof(buffer),
 618                                                  "/sys/class/net/%s/ifindex", e->d_name);
 619
 620                                         if ((cifidx = nl80211_readint(buffer)) >= 0 &&
 621                                             ((ifidx < 0) || (cifidx < ifidx)))
 622                                         {
 623                                                 ifidx = cifidx;
 624                                                 strncpy(nif, e->d_name, sizeof(nif) - 1);
 625                                         }
 626                                 }
 627                         }
 628
 629                         closedir(d);
 630                 }
 631         }
 632
 633         return nif[0] ? nif : NULL;
 634 }
 635
 636 static int nl80211_get_mode_cb(struct nl_msg *msg, void *arg)
 637 {
 638         int *mode = arg;
 639         struct nlattr **tb = nl80211_parse(msg);
 640         const int ifmodes[NL80211_IFTYPE_MAX + 1] = {
 641                 IWINFO_OPMODE_UNKNOWN,          /* unspecified */
 642                 IWINFO_OPMODE_ADHOC,            /* IBSS */
 643                 IWINFO_OPMODE_CLIENT,           /* managed */
 644                 IWINFO_OPMODE_MASTER,           /* AP */
 645                 IWINFO_OPMODE_AP_VLAN,          /* AP/VLAN */
 646                 IWINFO_OPMODE_WDS,                      /* WDS */
 647                 IWINFO_OPMODE_MONITOR,          /* monitor */
 648                 IWINFO_OPMODE_MESHPOINT,        /* mesh point */
 649                 IWINFO_OPMODE_P2P_CLIENT,       /* P2P-client */
 650                 IWINFO_OPMODE_P2P_GO,           /* P2P-GO */
 651         };
 652
 653         if (tb[NL80211_ATTR_IFTYPE])
 654                 *mode = ifmodes[nla_get_u32(tb[NL80211_ATTR_IFTYPE])];
 655
 656         return NL_SKIP;
 657 }
 658
 659
 660 static int nl80211_get_mode(const char *ifname, int *buf)
 661 {
 662         char *res;
 663
 664         *buf = IWINFO_OPMODE_UNKNOWN;
 665
 666         res = nl80211_phy2ifname(ifname);
 667
 668         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
 669                         nl80211_get_mode_cb, buf);
 670
 671         return (*buf == IWINFO_OPMODE_UNKNOWN) ? -1 : 0;
 672 }
 673
 674 static int __nl80211_hostapd_query(const char *ifname, ...)
 675 {
 676         va_list ap, ap_cur;
 677         char *phy, *search, *dest, *key, *val, buf[128];
 678         int len, mode, found = 0, match = 1;
 679         FILE *fp;
 680
 681         if (nl80211_get_mode(ifname, &mode))
 682                 return 0;
 683
 684         if (mode != IWINFO_OPMODE_MASTER && mode != IWINFO_OPMODE_AP_VLAN)
 685                 return 0;
 686
 687         phy = nl80211_ifname2phy(ifname);
 688
 689         if (!phy)
 690                 return 0;
 691
 692         snprintf(buf, sizeof(buf), "/var/run/hostapd-%s.conf", phy);
 693         fp = fopen(buf, "r");
 694
 695         if (!fp)
 696                 return 0;
 697
 698         va_start(ap, ifname);
 699
 700         /* clear all destination buffers */
 701         va_copy(ap_cur, ap);
 702
 703         while ((search = va_arg(ap_cur, char *)) != NULL)
 704         {
 705                 dest = va_arg(ap_cur, char *);
 706                 len  = va_arg(ap_cur, int);
 707
 708                 memset(dest, 0, len);
 709         }
 710
 711         va_end(ap_cur);
 712
 713         /* iterate applicable lines and copy found values into dest buffers */
 714         while (fgets(buf, sizeof(buf), fp))
 715         {
 716                 key = strtok(buf, " =\t\n");
 717                 val = strtok(NULL, "\n");
 718
 719                 if (!key || !val || !*key || *key == '#')
 720                         continue;
 721
 722                 if (!strcmp(key, "interface") || !strcmp(key, "bss"))
 723                         match = !strcmp(ifname, val);
 724
 725                 if (!match)
 726                         continue;
 727
 728                 va_copy(ap_cur, ap);
 729
 730                 while ((search = va_arg(ap_cur, char *)) != NULL)
 731                 {
 732                         dest = va_arg(ap_cur, char *);
 733                         len  = va_arg(ap_cur, int);
 734
 735                         if (!strcmp(search, key))
 736                         {
 737                                 strncpy(dest, val, len - 1);
 738                                 found++;
 739                                 break;
 740                         }
 741                 }
 742
 743                 va_end(ap_cur);
 744         }
 745
 746         fclose(fp);
 747
 748         va_end(ap);
 749
 750         return found;
 751 }
 752
 753 #define nl80211_hostapd_query(ifname, ...) \
 754         __nl80211_hostapd_query(ifname, ##__VA_ARGS__, NULL)
 755
 756
 757 static inline int nl80211_wpactl_recv(int sock, char *buf, int blen)
 758 {
 759         fd_set rfds;
 760         struct timeval tv = { 0, 256000 };
 761
 762         FD_ZERO(&rfds);
 763         FD_SET(sock, &rfds);
 764
 765         memset(buf, 0, blen);
 766
 767         if (select(sock + 1, &rfds, NULL, NULL, &tv) < 0)
 768                 return -1;
 769
 770         if (!FD_ISSET(sock, &rfds))
 771                 return -1;
 772
 773         return recv(sock, buf, blen - 1, 0);
 774 }
 775
 776 static int nl80211_wpactl_connect(const char *ifname, struct sockaddr_un *local)
 777 {
 778         struct sockaddr_un remote = { 0 };
 779         size_t remote_length, local_length;
 780
 781         int sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 782         if (sock < 0)
 783                 return sock;
 784
 785         remote.sun_family = AF_UNIX;
 786         remote_length = sizeof(remote.sun_family) +
 787                 sprintf(remote.sun_path, "/var/run/wpa_supplicant-%s/%s",
 788                         ifname, ifname);
 789
 790         if (fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC) < 0)
 791         {
 792                 close(sock);
 793                 return -1;
 794         }
 795
 796         if (connect(sock, (struct sockaddr *)&remote, remote_length))
 797         {
 798                 remote_length = sizeof(remote.sun_family) +
 799                         sprintf(remote.sun_path, "/var/run/wpa_supplicant/%s", ifname);
 800
 801                 if (connect(sock, (struct sockaddr *)&remote, remote_length))
 802                 {
 803                         close(sock);
 804                         return -1;
 805                 }
 806         }
 807
 808         local->sun_family = AF_UNIX;
 809         local_length = sizeof(local->sun_family) +
 810                 sprintf(local->sun_path, "/var/run/iwinfo-%s-%d", ifname, getpid());
 811
 812         if (bind(sock, (struct sockaddr *)local, local_length) < 0)
 813         {
 814                 close(sock);
 815                 return -1;
 816         }
 817
 818         return sock;
 819 }
 820
 821 static int __nl80211_wpactl_query(const char *ifname, ...)
 822 {
 823         va_list ap, ap_cur;
 824         struct sockaddr_un local = { 0 };
 825         int len, mode, found = 0, sock = -1;
 826         char *search, *dest, *key, *val, *line, *pos, buf[512];
 827
 828         if (nl80211_get_mode(ifname, &mode))
 829                 return 0;
 830
 831         if (mode != IWINFO_OPMODE_CLIENT && mode != IWINFO_OPMODE_ADHOC)
 832                 return 0;
 833
 834         sock = nl80211_wpactl_connect(ifname, &local);
 835
 836         if (sock < 0)
 837                 return 0;
 838
 839         va_start(ap, ifname);
 840
 841         /* clear all destination buffers */
 842         va_copy(ap_cur, ap);
 843
 844         while ((search = va_arg(ap_cur, char *)) != NULL)
 845         {
 846                 dest = va_arg(ap_cur, char *);
 847                 len  = va_arg(ap_cur, int);
 848
 849                 memset(dest, 0, len);
 850         }
 851
 852         va_end(ap_cur);
 853
 854         send(sock, "STATUS", 6, 0);
 855
 856         while (true)
 857         {
 858                 if (nl80211_wpactl_recv(sock, buf, sizeof(buf)) <= 0)
 859                         break;
 860
 861                 if (buf[0] == '<')
 862                         continue;
 863
 864                 for (line = strtok_r(buf, "\n", &pos);
 865                          line != NULL;
 866                          line = strtok_r(NULL, "\n", &pos))
 867                 {
 868                         key = strtok(line, "=");
 869                         val = strtok(NULL, "\n");
 870
 871                         if (!key || !val)
 872                                 continue;
 873
 874                         va_copy(ap_cur, ap);
 875
 876                         while ((search = va_arg(ap_cur, char *)) != NULL)
 877                         {
 878                                 dest = va_arg(ap_cur, char *);
 879                                 len  = va_arg(ap_cur, int);
 880
 881                                 if (!strcmp(search, key))
 882                                 {
 883                                         strncpy(dest, val, len - 1);
 884                                         found++;
 885                                         break;
 886                                 }
 887                         }
 888
 889                         va_end(ap_cur);
 890                 }
 891
 892                 break;
 893         }
 894
 895         va_end(ap);
 896
 897         close(sock);
 898         unlink(local.sun_path);
 899
 900         return found;
 901 }
 902
 903 #define nl80211_wpactl_query(ifname, ...) \
 904         __nl80211_wpactl_query(ifname, ##__VA_ARGS__, NULL)
 905
 906
 907 static char * nl80211_ifadd(const char *ifname)
 908 {
 909         char path[PATH_MAX];
 910         static char nif[IFNAMSIZ] = { 0 };
 911         struct nl80211_msg_conveyor *req;
 912         FILE *sysfs;
 913
 914         req = nl80211_msg(ifname, NL80211_CMD_NEW_INTERFACE, 0);
 915         if (req)
 916         {
 917                 snprintf(nif, sizeof(nif), "tmp.%s", ifname);
 918
 919                 NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, nif);
 920                 NLA_PUT_U32(req->msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_STATION);
 921
 922                 nl80211_send(req, NULL, NULL);
 923
 924                 snprintf(path, sizeof(path) - 1,
 925                          "/proc/sys/net/ipv6/conf/%s/disable_ipv6", nif);
 926
 927                 if ((sysfs = fopen(path, "w")) != NULL)
 928                 {
 929                         fwrite("0\n", 1, 2, sysfs);
 930                         fclose(sysfs);
 931                 }
 932
 933                 return nif;
 934
 935         nla_put_failure:
 936                 nl80211_free(req);
 937         }
 938
 939         return NULL;
 940 }
 941
 942 static void nl80211_ifdel(const char *ifname)
 943 {
 944         struct nl80211_msg_conveyor *req;
 945         int err;
 946
 947         req = nl80211_msg(ifname, NL80211_CMD_DEL_INTERFACE, 0);
 948         if (req)
 949         {
 950                 NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, ifname);
 951
 952                 nl80211_send(req, NULL, NULL);
 953                 return;
 954
 955         nla_put_failure:
 956                 nl80211_free(req);
 957         }
 958 }
 959
 960 static void nl80211_hostapd_hup(const char *ifname)
 961 {
 962         int fd, pid = 0;
 963         char buf[32];
 964         char *phy = nl80211_ifname2phy(ifname);
 965
 966         if (phy)
 967         {
 968                 snprintf(buf, sizeof(buf), "/var/run/wifi-%s.pid", phy);
 969                 if ((fd = open(buf, O_RDONLY)) >= 0)
 970                 {
 971                         if (read(fd, buf, sizeof(buf)) > 0)
 972                                 pid = atoi(buf);
 973
 974                         close(fd);
 975                 }
 976
 977                 if (pid > 0)
 978                         kill(pid, 1);
 979         }
 980 }
 981
 982
 983 static int nl80211_probe(const char *ifname)
 984 {
 985         return !!nl80211_ifname2phy(ifname);
 986 }
 987
 988 struct nl80211_ssid_bssid {
 989         unsigned char *ssid;
 990         unsigned char bssid[7];
 991 };
 992
 993 static int nl80211_get_ssid_bssid_cb(struct nl_msg *msg, void *arg)
 994 {
 995         int ielen;
 996         unsigned char *ie;
 997         struct nl80211_ssid_bssid *sb = arg;
 998         struct nlattr **tb = nl80211_parse(msg);
 999         struct nlattr *bss[NL80211_BSS_MAX + 1];
1000
1001         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
1002                 [NL80211_BSS_INFORMATION_ELEMENTS] = { 0 },
1003                 [NL80211_BSS_STATUS]               = { .type = NLA_U32 },
1004         };
1005
1006         if (!tb[NL80211_ATTR_BSS] ||
1007             nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
1008                              bss_policy) ||
1009             !bss[NL80211_BSS_BSSID] ||
1010             !bss[NL80211_BSS_STATUS] ||
1011             !bss[NL80211_BSS_INFORMATION_ELEMENTS])
1012         {
1013                 return NL_SKIP;
1014         }
1015
1016         switch (nla_get_u32(bss[NL80211_BSS_STATUS]))
1017         {
1018         case NL80211_BSS_STATUS_ASSOCIATED:
1019         case NL80211_BSS_STATUS_AUTHENTICATED:
1020         case NL80211_BSS_STATUS_IBSS_JOINED:
1021
1022                 if (sb->ssid)
1023                 {
1024                         ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
1025                         ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
1026
1027                         while (ielen >= 2 && ielen >= ie[1])
1028                         {
1029                                 if (ie[0] == 0)
1030                                 {
1031                                         memcpy(sb->ssid, ie + 2, min(ie[1], IWINFO_ESSID_MAX_SIZE));
1032                                         return NL_SKIP;
1033                                 }
1034
1035                                 ielen -= ie[1] + 2;
1036                                 ie += ie[1] + 2;
1037                         }
1038                 }
1039                 else
1040                 {
1041                         sb->bssid[0] = 1;
1042                         memcpy(sb->bssid + 1, nla_data(bss[NL80211_BSS_BSSID]), 6);
1043                         return NL_SKIP;
1044                 }
1045
1046         default:
1047                 return NL_SKIP;
1048         }
1049 }
1050
1051 static int nl80211_get_ssid(const char *ifname, char *buf)
1052 {
1053         char *res;
1054         struct nl80211_ssid_bssid sb = { .ssid = (unsigned char *)buf };
1055
1056         /* try to find ssid from scan dump results */
1057         res = nl80211_phy2ifname(ifname);
1058         sb.ssid[0] = 0;
1059
1060         nl80211_request(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1061                         nl80211_get_ssid_bssid_cb, &sb);
1062
1063         /* failed, try to find from hostapd info */
1064         if (sb.ssid[0] == 0)
1065                 nl80211_hostapd_query(ifname, "ssid", sb.ssid,
1066                                       IWINFO_ESSID_MAX_SIZE + 1);
1067
1068         return (sb.ssid[0] == 0) ? -1 : 0;
1069 }
1070
1071 static int nl80211_get_bssid(const char *ifname, char *buf)
1072 {
1073         char *res, bssid[sizeof("FF:FF:FF:FF:FF:FF\0")];
1074         struct nl80211_ssid_bssid sb = { };
1075
1076         /* try to find bssid from scan dump results */
1077         res = nl80211_phy2ifname(ifname);
1078
1079         nl80211_request(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1080                         nl80211_get_ssid_bssid_cb, &sb);
1081
1082         /* failed, try to find mac from hostapd info */
1083         if ((sb.bssid[0] == 0) &&
1084             nl80211_hostapd_query(ifname, "bssid", bssid, sizeof(bssid)))
1085         {
1086                 sb.bssid[0] = 1;
1087                 sb.bssid[1] = strtol(&bssid[0],  NULL, 16);
1088                 sb.bssid[2] = strtol(&bssid[3],  NULL, 16);
1089                 sb.bssid[3] = strtol(&bssid[6],  NULL, 16);
1090                 sb.bssid[4] = strtol(&bssid[9],  NULL, 16);
1091                 sb.bssid[5] = strtol(&bssid[12], NULL, 16);
1092                 sb.bssid[6] = strtol(&bssid[15], NULL, 16);
1093         }
1094
1095         if (sb.bssid[0])
1096         {
1097                 sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
1098                         sb.bssid[1], sb.bssid[2], sb.bssid[3],
1099                         sb.bssid[4], sb.bssid[5], sb.bssid[6]);
1100
1101                 return 0;
1102         }
1103
1104         return -1;
1105 }
1106
1107
1108 static int nl80211_get_frequency_scan_cb(struct nl_msg *msg, void *arg)
1109 {
1110         int *freq = arg;
1111         struct nlattr **attr = nl80211_parse(msg);
1112         struct nlattr *binfo[NL80211_BSS_MAX + 1];
1113
1114         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
1115                 [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
1116                 [NL80211_BSS_STATUS]    = { .type = NLA_U32 },
1117         };
1118
1119         if (attr[NL80211_ATTR_BSS] &&
1120             !nla_parse_nested(binfo, NL80211_BSS_MAX,
1121                               attr[NL80211_ATTR_BSS], bss_policy))
1122         {
1123                 if (binfo[NL80211_BSS_STATUS] && binfo[NL80211_BSS_FREQUENCY])
1124                         *freq = nla_get_u32(binfo[NL80211_BSS_FREQUENCY]);
1125         }
1126
1127         return NL_SKIP;
1128 }
1129
1130 static int nl80211_get_frequency_info_cb(struct nl_msg *msg, void *arg)
1131 {
1132         int *freq = arg;
1133         struct nlattr **tb = nl80211_parse(msg);
1134
1135         if (tb[NL80211_ATTR_WIPHY_FREQ])
1136                 *freq = nla_get_u32(tb[NL80211_ATTR_WIPHY_FREQ]);
1137
1138         return NL_SKIP;
1139 }
1140
1141 static int nl80211_get_frequency(const char *ifname, int *buf)
1142 {
1143         char *res, channel[4], hwmode[2];
1144
1145         /* try to find frequency from interface info */
1146         res = nl80211_phy2ifname(ifname);
1147         *buf = 0;
1148
1149         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1150                         nl80211_get_frequency_info_cb, buf);
1151
1152         /* failed, try to find frequency from hostapd info */
1153         if ((*buf == 0) &&
1154             nl80211_hostapd_query(ifname, "hw_mode", hwmode, sizeof(hwmode),
1155                                           "channel", channel, sizeof(channel)) == 2)
1156         {
1157                 *buf = nl80211_channel2freq(atoi(channel), hwmode);
1158         }
1159
1160         /* failed, try to find frequency from scan results */
1161         if (*buf == 0)
1162         {
1163                 res = nl80211_phy2ifname(ifname);
1164
1165                 nl80211_request(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1166                                 nl80211_get_frequency_scan_cb, buf);
1167         }
1168
1169         return (*buf == 0) ? -1 : 0;
1170 }
1171
1172 static int nl80211_get_channel(const char *ifname, int *buf)
1173 {
1174         if (!nl80211_get_frequency(ifname, buf))
1175         {
1176                 *buf = nl80211_freq2channel(*buf);
1177                 return 0;
1178         }
1179
1180         return -1;
1181 }
1182
1183 static int nl80211_get_txpower_cb(struct nl_msg *msg, void *arg)
1184 {
1185         int *buf = arg;
1186         struct nlattr **tb = nl80211_parse(msg);
1187
1188         if (tb[NL80211_ATTR_WIPHY_TX_POWER_LEVEL])
1189                 *buf = iwinfo_mbm2dbm(nla_get_u32(tb[NL80211_ATTR_WIPHY_TX_POWER_LEVEL]));
1190
1191         return NL_SKIP;
1192 }
1193
1194 static int nl80211_get_txpower(const char *ifname, int *buf)
1195 {
1196         char *res;
1197
1198         res = nl80211_phy2ifname(ifname);
1199         *buf = 0;
1200
1201         if (nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1202                             nl80211_get_txpower_cb, buf))
1203                 return -1;
1204
1205         return 0;
1206 }
1207
1208
1209 static int nl80211_fill_signal_cb(struct nl_msg *msg, void *arg)
1210 {
1211         int8_t dbm;
1212         int16_t mbit;
1213         struct nl80211_rssi_rate *rr = arg;
1214         struct nlattr **attr = nl80211_parse(msg);
1215         struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
1216         struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
1217
1218         static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
1219                 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32    },
1220                 [NL80211_STA_INFO_RX_BYTES]      = { .type = NLA_U32    },
1221                 [NL80211_STA_INFO_TX_BYTES]      = { .type = NLA_U32    },
1222                 [NL80211_STA_INFO_RX_PACKETS]    = { .type = NLA_U32    },
1223                 [NL80211_STA_INFO_TX_PACKETS]    = { .type = NLA_U32    },
1224                 [NL80211_STA_INFO_SIGNAL]        = { .type = NLA_U8     },
1225                 [NL80211_STA_INFO_TX_BITRATE]    = { .type = NLA_NESTED },
1226                 [NL80211_STA_INFO_LLID]          = { .type = NLA_U16    },
1227                 [NL80211_STA_INFO_PLID]          = { .type = NLA_U16    },
1228                 [NL80211_STA_INFO_PLINK_STATE]   = { .type = NLA_U8     },
1229         };
1230
1231         static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
1232                 [NL80211_RATE_INFO_BITRATE]      = { .type = NLA_U16  },
1233                 [NL80211_RATE_INFO_MCS]          = { .type = NLA_U8   },
1234                 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG },
1235                 [NL80211_RATE_INFO_SHORT_GI]     = { .type = NLA_FLAG },
1236         };
1237
1238         if (attr[NL80211_ATTR_STA_INFO])
1239         {
1240                 if (!nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
1241                                       attr[NL80211_ATTR_STA_INFO], stats_policy))
1242                 {
1243                         if (sinfo[NL80211_STA_INFO_SIGNAL])
1244                         {
1245                                 dbm = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
1246                                 rr->rssi = rr->rssi ? (int8_t)((rr->rssi + dbm) / 2) : dbm;
1247                         }
1248
1249                         if (sinfo[NL80211_STA_INFO_TX_BITRATE])
1250                         {
1251                                 if (!nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
1252                                                       sinfo[NL80211_STA_INFO_TX_BITRATE],
1253                                                       rate_policy))
1254                                 {
1255                                         if (rinfo[NL80211_RATE_INFO_BITRATE])
1256                                         {
1257                                                 mbit = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]);
1258                                                 rr->rate = rr->rate
1259                                                         ? (int16_t)((rr->rate + mbit) / 2) : mbit;
1260                                         }
1261                                 }
1262                         }
1263                 }
1264         }
1265
1266         return NL_SKIP;
1267 }
1268
1269 static void nl80211_fill_signal(const char *ifname, struct nl80211_rssi_rate *r)
1270 {
1271         DIR *d;
1272         struct dirent *de;
1273
1274         r->rssi = 0;
1275         r->rate = 0;
1276
1277         if ((d = opendir("/sys/class/net")) != NULL)
1278         {
1279                 while ((de = readdir(d)) != NULL)
1280                 {
1281                         if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
1282                             (!de->d_name[strlen(ifname)] ||
1283                              !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
1284                         {
1285                                 nl80211_request(de->d_name, NL80211_CMD_GET_STATION,
1286                                                 NLM_F_DUMP, nl80211_fill_signal_cb, r);
1287                         }
1288                 }
1289
1290                 closedir(d);
1291         }
1292 }
1293
1294 static int nl80211_get_bitrate(const char *ifname, int *buf)
1295 {
1296         struct nl80211_rssi_rate rr;
1297
1298         nl80211_fill_signal(ifname, &rr);
1299
1300         if (rr.rate)
1301         {
1302                 *buf = (rr.rate * 100);
1303                 return 0;
1304         }
1305
1306         return -1;
1307 }
1308
1309 static int nl80211_get_signal(const char *ifname, int *buf)
1310 {
1311         struct nl80211_rssi_rate rr;
1312
1313         nl80211_fill_signal(ifname, &rr);
1314
1315         if (rr.rssi)
1316         {
1317                 *buf = rr.rssi;
1318                 return 0;
1319         }
1320
1321         return -1;
1322 }
1323
1324 static int nl80211_get_noise_cb(struct nl_msg *msg, void *arg)
1325 {
1326         int8_t *noise = arg;
1327         struct nlattr **tb = nl80211_parse(msg);
1328         struct nlattr *si[NL80211_SURVEY_INFO_MAX + 1];
1329
1330         static struct nla_policy sp[NL80211_SURVEY_INFO_MAX + 1] = {
1331                 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
1332                 [NL80211_SURVEY_INFO_NOISE]     = { .type = NLA_U8  },
1333         };
1334
1335         if (!tb[NL80211_ATTR_SURVEY_INFO])
1336                 return NL_SKIP;
1337
1338         if (nla_parse_nested(si, NL80211_SURVEY_INFO_MAX,
1339                              tb[NL80211_ATTR_SURVEY_INFO], sp))
1340                 return NL_SKIP;
1341
1342         if (!si[NL80211_SURVEY_INFO_NOISE])
1343                 return NL_SKIP;
1344
1345         if (!*noise || si[NL80211_SURVEY_INFO_IN_USE])
1346                 *noise = (int8_t)nla_get_u8(si[NL80211_SURVEY_INFO_NOISE]);
1347
1348         return NL_SKIP;
1349 }
1350
1351
1352 static int nl80211_get_noise(const char *ifname, int *buf)
1353 {
1354         int8_t noise = 0;
1355
1356         if (nl80211_request(ifname, NL80211_CMD_GET_SURVEY, NLM_F_DUMP,
1357                             nl80211_get_noise_cb, &noise))
1358                 goto out;
1359
1360         *buf = noise;
1361         return 0;
1362
1363 out:
1364         *buf = 0;
1365         return -1;
1366 }
1367
1368 static int nl80211_get_quality(const char *ifname, int *buf)
1369 {
1370         int signal;
1371
1372         if (!nl80211_get_signal(ifname, &signal))
1373         {
1374                 /* A positive signal level is usually just a quality
1375                  * value, pass through as-is */
1376                 if (signal >= 0)
1377                 {
1378                         *buf = signal;
1379                 }
1380
1381                 /* The cfg80211 wext compat layer assumes a signal range
1382                  * of -110 dBm to -40 dBm, the quality value is derived
1383                  * by adding 110 to the signal level */
1384                 else
1385                 {
1386                         if (signal < -110)
1387                                 signal = -110;
1388                         else if (signal > -40)
1389                                 signal = -40;
1390
1391                         *buf = (signal + 110);
1392                 }
1393
1394                 return 0;
1395         }
1396
1397         return -1;
1398 }
1399
1400 static int nl80211_get_quality_max(const char *ifname, int *buf)
1401 {
1402         /* The cfg80211 wext compat layer assumes a maximum
1403          * quality of 70 */
1404         *buf = 70;
1405
1406         return 0;
1407 }
1408
1409 static int nl80211_check_wepkey(const char *key)
1410 {
1411         if (key && *key)
1412         {
1413                 switch (strlen(key))
1414                 {
1415                 case 5:
1416                 case 10:
1417                         return IWINFO_CIPHER_WEP40;
1418
1419                 case 13:
1420                 case 26:
1421                         return IWINFO_CIPHER_WEP104;
1422                 }
1423         }
1424
1425         return 0;
1426 }
1427
1428 static int nl80211_get_encryption(const char *ifname, char *buf)
1429 {
1430         char wpa[2], wpa_key_mgmt[16], wpa_pairwise[16], wpa_groupwise[16];
1431         char auth_algs[2], wep_key0[27], wep_key1[27], wep_key2[27], wep_key3[27];
1432
1433         struct iwinfo_crypto_entry *c = (struct iwinfo_crypto_entry *)buf;
1434
1435         /* WPA supplicant */
1436         if (nl80211_wpactl_query(ifname,
1437                         "pairwise_cipher", wpa_pairwise,  sizeof(wpa_pairwise),
1438                         "group_cipher",    wpa_groupwise, sizeof(wpa_groupwise),
1439                         "key_mgmt",        wpa_key_mgmt,  sizeof(wpa_key_mgmt)))
1440         {
1441                 /* WEP */
1442                 if (!strcmp(wpa_key_mgmt, "NONE"))
1443                 {
1444                         if (strstr(wpa_pairwise, "WEP-40"))
1445                                 c->pair_ciphers |= IWINFO_CIPHER_WEP40;
1446                         else if (strstr(wpa_pairwise, "WEP-104"))
1447                                 c->pair_ciphers |= IWINFO_CIPHER_WEP104;
1448
1449                         if (strstr(wpa_groupwise, "WEP-40"))
1450                                 c->group_ciphers |= IWINFO_CIPHER_WEP40;
1451                         else if (strstr(wpa_groupwise, "WEP-104"))
1452                                 c->group_ciphers |= IWINFO_CIPHER_WEP104;
1453
1454                         c->enabled      = !!(c->pair_ciphers | c->group_ciphers);
1455                         c->auth_suites |= IWINFO_KMGMT_NONE;
1456                         c->auth_algs   |= IWINFO_AUTH_OPEN; /* XXX: assumption */
1457                 }
1458
1459                 /* WPA */
1460                 else if (strstr(wpa_key_mgmt, "WPA"))
1461                 {
1462                         if (strstr(wpa_pairwise, "TKIP"))
1463                                 c->pair_ciphers |= IWINFO_CIPHER_TKIP;
1464                         else if (strstr(wpa_pairwise, "CCMP"))
1465                                 c->pair_ciphers |= IWINFO_CIPHER_CCMP;
1466                         else if (strstr(wpa_pairwise, "NONE"))
1467                                 c->pair_ciphers |= IWINFO_CIPHER_NONE;
1468                         else if (strstr(wpa_pairwise, "WEP-40"))
1469                                 c->pair_ciphers |= IWINFO_CIPHER_WEP40;
1470                         else if (strstr(wpa_pairwise, "WEP-104"))
1471                                 c->pair_ciphers |= IWINFO_CIPHER_WEP104;
1472
1473                         if (strstr(wpa_groupwise, "TKIP"))
1474                                 c->group_ciphers |= IWINFO_CIPHER_TKIP;
1475                         else if (strstr(wpa_groupwise, "CCMP"))
1476                                 c->group_ciphers |= IWINFO_CIPHER_CCMP;
1477                         else if (strstr(wpa_groupwise, "NONE"))
1478                                 c->group_ciphers |= IWINFO_CIPHER_NONE;
1479                         else if (strstr(wpa_groupwise, "WEP-40"))
1480                                 c->group_ciphers |= IWINFO_CIPHER_WEP40;
1481                         else if (strstr(wpa_groupwise, "WEP-104"))
1482                                 c->group_ciphers |= IWINFO_CIPHER_WEP104;
1483
1484                         if (strstr(wpa_key_mgmt, "WPA2"))
1485                                 c->wpa_version = 2;
1486                         else if (strstr(wpa_key_mgmt, "WPA"))
1487                                 c->wpa_version = 1;
1488
1489                         if (strstr(wpa_key_mgmt, "PSK"))
1490                                 c->auth_suites |= IWINFO_KMGMT_PSK;
1491                         else if (strstr(wpa_key_mgmt, "EAP") ||
1492                                  strstr(wpa_key_mgmt, "802.1X"))
1493                                 c->auth_suites |= IWINFO_KMGMT_8021x;
1494                         else if (strstr(wpa_key_mgmt, "NONE"))
1495                                 c->auth_suites |= IWINFO_KMGMT_NONE;
1496
1497                         c->enabled = !!(c->wpa_version && c->auth_suites);
1498                 }
1499
1500                 return 0;
1501         }
1502
1503         /* Hostapd */
1504         else if (nl80211_hostapd_query(ifname,
1505                                 "wpa",          wpa,          sizeof(wpa),
1506                                 "wpa_key_mgmt", wpa_key_mgmt, sizeof(wpa_key_mgmt),
1507                                 "wpa_pairwise", wpa_pairwise, sizeof(wpa_pairwise),
1508                                 "auth_algs",    auth_algs,    sizeof(auth_algs),
1509                                 "wep_key0",     wep_key0,     sizeof(wep_key0),
1510                                 "wep_key1",     wep_key1,     sizeof(wep_key1),
1511                                 "wep_key2",     wep_key2,     sizeof(wep_key2),
1512                                 "wep_key3",     wep_key3,     sizeof(wep_key3)))
1513         {
1514                 c->wpa_version = wpa[0] ? atoi(wpa) : 0;
1515
1516                 if (wpa_key_mgmt[0])
1517                 {
1518                         if (strstr(wpa_key_mgmt, "PSK"))
1519                                 c->auth_suites |= IWINFO_KMGMT_PSK;
1520
1521                         if (strstr(wpa_key_mgmt, "EAP"))
1522                                 c->auth_suites |= IWINFO_KMGMT_8021x;
1523
1524                         if (strstr(wpa_key_mgmt, "NONE"))
1525                                 c->auth_suites |= IWINFO_KMGMT_NONE;
1526                 }
1527                 else
1528                 {
1529                         c->auth_suites |= IWINFO_KMGMT_PSK;
1530                 }
1531
1532                 if (wpa_pairwise[0])
1533                 {
1534                         if (strstr(wpa_pairwise, "TKIP"))
1535                                 c->pair_ciphers |= IWINFO_CIPHER_TKIP;
1536
1537                         if (strstr(wpa_pairwise, "CCMP"))
1538                                 c->pair_ciphers |= IWINFO_CIPHER_CCMP;
1539
1540                         if (strstr(wpa_pairwise, "NONE"))
1541                                 c->pair_ciphers |= IWINFO_CIPHER_NONE;
1542                 }
1543
1544                 if (auth_algs[0])
1545                 {
1546                         switch(atoi(auth_algs))
1547                         {
1548                         case 1:
1549                                 c->auth_algs |= IWINFO_AUTH_OPEN;
1550                                 break;
1551
1552                         case 2:
1553                                 c->auth_algs |= IWINFO_AUTH_SHARED;
1554                                 break;
1555
1556                         case 3:
1557                                 c->auth_algs |= IWINFO_AUTH_OPEN;
1558                                 c->auth_algs |= IWINFO_AUTH_SHARED;
1559                                 break;
1560                         }
1561
1562                         c->pair_ciphers |= nl80211_check_wepkey(wep_key0);
1563                         c->pair_ciphers |= nl80211_check_wepkey(wep_key1);
1564                         c->pair_ciphers |= nl80211_check_wepkey(wep_key2);
1565                         c->pair_ciphers |= nl80211_check_wepkey(wep_key3);
1566                 }
1567
1568                 c->group_ciphers = c->pair_ciphers;
1569                 c->enabled = (c->wpa_version || c->pair_ciphers) ? 1 : 0;
1570
1571                 return 0;
1572         }
1573
1574         return -1;
1575 }
1576
1577 static int nl80211_get_phyname(const char *ifname, char *buf)
1578 {
1579         const char *name;
1580
1581         name = nl80211_ifname2phy(ifname);
1582
1583         if (name)
1584         {
1585                 strcpy(buf, name);
1586                 return 0;
1587         }
1588         else if ((name = nl80211_phy2ifname(ifname)) != NULL)
1589         {
1590                 name = nl80211_ifname2phy(name);
1591
1592                 if (name)
1593                 {
1594                         strcpy(buf, ifname);
1595                         return 0;
1596                 }
1597         }
1598
1599         return -1;
1600 }
1601
1602
1603 static void nl80211_parse_rateinfo(struct nlattr **ri,
1604                                    struct iwinfo_rate_entry *re)
1605 {
1606         if (ri[NL80211_RATE_INFO_BITRATE32])
1607                 re->rate = nla_get_u32(ri[NL80211_RATE_INFO_BITRATE32]) * 100;
1608         else if (ri[NL80211_RATE_INFO_BITRATE])
1609                 re->rate = nla_get_u16(ri[NL80211_RATE_INFO_BITRATE]) * 100;
1610
1611         if (ri[NL80211_RATE_INFO_VHT_MCS])
1612         {
1613                 re->is_vht = 1;
1614                 re->mcs = nla_get_u8(ri[NL80211_RATE_INFO_VHT_MCS]);
1615
1616                 if (ri[NL80211_RATE_INFO_VHT_NSS])
1617                         re->nss = nla_get_u8(ri[NL80211_RATE_INFO_VHT_NSS]);
1618         }
1619         else if (ri[NL80211_RATE_INFO_MCS])
1620         {
1621                 re->is_ht = 1;
1622                 re->mcs = nla_get_u8(ri[NL80211_RATE_INFO_MCS]);
1623         }
1624
1625         if (ri[NL80211_RATE_INFO_5_MHZ_WIDTH])
1626                 re->mhz = 5;
1627         else if (ri[NL80211_RATE_INFO_10_MHZ_WIDTH])
1628                 re->mhz = 10;
1629         else if (ri[NL80211_RATE_INFO_40_MHZ_WIDTH])
1630                 re->mhz = 40;
1631         else if (ri[NL80211_RATE_INFO_80_MHZ_WIDTH])
1632                 re->mhz = 80;
1633         else if (ri[NL80211_RATE_INFO_80P80_MHZ_WIDTH] ||
1634                  ri[NL80211_RATE_INFO_160_MHZ_WIDTH])
1635                 re->mhz = 160;
1636         else
1637                 re->mhz = 20;
1638
1639         if (ri[NL80211_RATE_INFO_SHORT_GI])
1640                 re->is_short_gi = 1;
1641
1642         re->is_40mhz = (re->mhz == 40);
1643 }
1644
1645 static int nl80211_get_assoclist_cb(struct nl_msg *msg, void *arg)
1646 {
1647         struct nl80211_array_buf *arr = arg;
1648         struct iwinfo_assoclist_entry *e = arr->buf;
1649         struct nlattr **attr = nl80211_parse(msg);
1650         struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
1651         struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
1652         struct nl80211_sta_flag_update *sta_flags;
1653
1654         static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
1655                 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32    },
1656                 [NL80211_STA_INFO_RX_PACKETS]    = { .type = NLA_U32    },
1657                 [NL80211_STA_INFO_TX_PACKETS]    = { .type = NLA_U32    },
1658                 [NL80211_STA_INFO_RX_BITRATE]    = { .type = NLA_NESTED },
1659                 [NL80211_STA_INFO_TX_BITRATE]    = { .type = NLA_NESTED },
1660                 [NL80211_STA_INFO_SIGNAL]        = { .type = NLA_U8     },
1661                 [NL80211_STA_INFO_RX_BYTES]      = { .type = NLA_U32    },
1662                 [NL80211_STA_INFO_TX_BYTES]      = { .type = NLA_U32    },
1663                 [NL80211_STA_INFO_TX_RETRIES]    = { .type = NLA_U32    },
1664                 [NL80211_STA_INFO_TX_FAILED]     = { .type = NLA_U32    },
1665                 [NL80211_STA_INFO_T_OFFSET]      = { .type = NLA_U64    },
1666                 [NL80211_STA_INFO_STA_FLAGS] =
1667                         { .minlen = sizeof(struct nl80211_sta_flag_update) },
1668         };
1669
1670         static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
1671                 [NL80211_RATE_INFO_BITRATE]      = { .type = NLA_U16    },
1672                 [NL80211_RATE_INFO_MCS]          = { .type = NLA_U8     },
1673                 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG   },
1674                 [NL80211_RATE_INFO_SHORT_GI]     = { .type = NLA_FLAG   },
1675         };
1676
1677         /* advance to end of array */
1678         e += arr->count;
1679         memset(e, 0, sizeof(*e));
1680
1681         if (attr[NL80211_ATTR_MAC])
1682                 memcpy(e->mac, nla_data(attr[NL80211_ATTR_MAC]), 6);
1683
1684         if (attr[NL80211_ATTR_STA_INFO] &&
1685             !nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
1686                               attr[NL80211_ATTR_STA_INFO], stats_policy))
1687         {
1688                 if (sinfo[NL80211_STA_INFO_SIGNAL])
1689                         e->signal = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
1690
1691                 if (sinfo[NL80211_STA_INFO_INACTIVE_TIME])
1692                         e->inactive = nla_get_u32(sinfo[NL80211_STA_INFO_INACTIVE_TIME]);
1693
1694                 if (sinfo[NL80211_STA_INFO_RX_PACKETS])
1695                         e->rx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_RX_PACKETS]);
1696
1697                 if (sinfo[NL80211_STA_INFO_TX_PACKETS])
1698                         e->tx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_TX_PACKETS]);
1699
1700                 if (sinfo[NL80211_STA_INFO_RX_BITRATE] &&
1701                     !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
1702                                       sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy))
1703                         nl80211_parse_rateinfo(rinfo, &e->rx_rate);
1704
1705                 if (sinfo[NL80211_STA_INFO_TX_BITRATE] &&
1706                     !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
1707                                       sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy))
1708                         nl80211_parse_rateinfo(rinfo, &e->tx_rate);
1709
1710                 if (sinfo[NL80211_STA_INFO_RX_BYTES])
1711                         e->rx_bytes = nla_get_u32(sinfo[NL80211_STA_INFO_RX_BYTES]);
1712
1713                 if (sinfo[NL80211_STA_INFO_TX_BYTES])
1714                         e->tx_bytes = nla_get_u32(sinfo[NL80211_STA_INFO_TX_BYTES]);
1715
1716                 if (sinfo[NL80211_STA_INFO_TX_RETRIES])
1717                         e->tx_retries = nla_get_u32(sinfo[NL80211_STA_INFO_TX_RETRIES]);
1718
1719                 if (sinfo[NL80211_STA_INFO_TX_FAILED])
1720                         e->tx_failed = nla_get_u32(sinfo[NL80211_STA_INFO_TX_FAILED]);
1721
1722                 if (sinfo[NL80211_STA_INFO_T_OFFSET])
1723                         e->t_offset = nla_get_u64(sinfo[NL80211_STA_INFO_T_OFFSET]);
1724
1725                 /* Station flags */
1726                 if (sinfo[NL80211_STA_INFO_STA_FLAGS])
1727                 {
1728                         sta_flags = (struct nl80211_sta_flag_update *)
1729                                 nla_data(sinfo[NL80211_STA_INFO_STA_FLAGS]);
1730
1731                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_AUTHORIZED) &&
1732                             sta_flags->set & BIT(NL80211_STA_FLAG_AUTHORIZED))
1733                                 e->is_authorized = 1;
1734
1735                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_AUTHENTICATED) &&
1736                             sta_flags->set & BIT(NL80211_STA_FLAG_AUTHENTICATED))
1737                                 e->is_authenticated = 1;
1738
1739                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) &&
1740                             sta_flags->set & BIT(NL80211_STA_FLAG_SHORT_PREAMBLE))
1741                                 e->is_preamble_short = 1;
1742
1743                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_WME) &&
1744                             sta_flags->set & BIT(NL80211_STA_FLAG_WME))
1745                                 e->is_wme = 1;
1746
1747                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_MFP) &&
1748                             sta_flags->set & BIT(NL80211_STA_FLAG_MFP))
1749                                 e->is_mfp = 1;
1750
1751                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_TDLS_PEER) &&
1752                             sta_flags->set & BIT(NL80211_STA_FLAG_TDLS_PEER))
1753                                 e->is_tdls = 1;
1754                 }
1755         }
1756
1757         e->noise = 0; /* filled in by caller */
1758         arr->count++;
1759
1760         return NL_SKIP;
1761 }
1762
1763 static int nl80211_get_assoclist(const char *ifname, char *buf, int *len)
1764 {
1765         DIR *d;
1766         int i, noise = 0;
1767         struct dirent *de;
1768         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
1769         struct iwinfo_assoclist_entry *e;
1770
1771         if ((d = opendir("/sys/class/net")) != NULL)
1772         {
1773                 while ((de = readdir(d)) != NULL)
1774                 {
1775                         if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
1776                             (!de->d_name[strlen(ifname)] ||
1777                              !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
1778                         {
1779                                 nl80211_request(de->d_name, NL80211_CMD_GET_STATION,
1780                                                 NLM_F_DUMP, nl80211_get_assoclist_cb, &arr);
1781                         }
1782                 }
1783
1784                 closedir(d);
1785
1786                 if (!nl80211_get_noise(ifname, &noise))
1787                         for (i = 0, e = arr.buf; i < arr.count; i++, e++)
1788                                 e->noise = noise;
1789
1790                 *len = (arr.count * sizeof(struct iwinfo_assoclist_entry));
1791                 return 0;
1792         }
1793
1794         return -1;
1795 }
1796
1797 static int nl80211_get_txpwrlist_cb(struct nl_msg *msg, void *arg)
1798 {
1799         int *dbm_max = arg;
1800         int ch_cur, ch_cmp, bands_remain, freqs_remain;
1801
1802         struct nlattr **attr = nl80211_parse(msg);
1803         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
1804         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
1805         struct nlattr *band, *freq;
1806
1807         static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
1808                 [NL80211_FREQUENCY_ATTR_FREQ]         = { .type = NLA_U32  },
1809                 [NL80211_FREQUENCY_ATTR_DISABLED]     = { .type = NLA_FLAG },
1810                 [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
1811                 [NL80211_FREQUENCY_ATTR_NO_IBSS]      = { .type = NLA_FLAG },
1812                 [NL80211_FREQUENCY_ATTR_RADAR]        = { .type = NLA_FLAG },
1813                 [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32  },
1814         };
1815
1816         ch_cur = *dbm_max; /* value int* is initialized with channel by caller */
1817         *dbm_max = -1;
1818
1819         nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
1820         {
1821                 nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
1822                           nla_len(band), NULL);
1823
1824                 nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
1825                 {
1826                         nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
1827                                   nla_data(freq), nla_len(freq), freq_policy);
1828
1829                         ch_cmp = nl80211_freq2channel(nla_get_u32(
1830                                 freqs[NL80211_FREQUENCY_ATTR_FREQ]));
1831
1832                         if ((!ch_cur || (ch_cmp == ch_cur)) &&
1833                             freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER])
1834                         {
1835                                 *dbm_max = (int)(0.01 * nla_get_u32(
1836                                         freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]));
1837
1838                                 break;
1839                         }
1840                 }
1841         }
1842
1843         return NL_SKIP;
1844 }
1845
1846 static int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len)
1847 {
1848         int err, ch_cur;
1849         int dbm_max = -1, dbm_cur, dbm_cnt;
1850         struct nl80211_msg_conveyor *req;
1851         struct iwinfo_txpwrlist_entry entry;
1852
1853         if (nl80211_get_channel(ifname, &ch_cur))
1854                 ch_cur = 0;
1855
1856         /* initialize the value pointer with channel for callback */
1857         dbm_max = ch_cur;
1858
1859         err = nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
1860                               nl80211_get_txpwrlist_cb, &dbm_max);
1861
1862         if (!err)
1863         {
1864                 for (dbm_cur = 0, dbm_cnt = 0;
1865                      dbm_cur < dbm_max;
1866                      dbm_cur++, dbm_cnt++)
1867                 {
1868                         entry.dbm = dbm_cur;
1869                         entry.mw  = iwinfo_dbm2mw(dbm_cur);
1870
1871                         memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
1872                 }
1873
1874                 entry.dbm = dbm_max;
1875                 entry.mw  = iwinfo_dbm2mw(dbm_max);
1876
1877                 memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
1878                 dbm_cnt++;
1879
1880                 *len = dbm_cnt * sizeof(entry);
1881                 return 0;
1882         }
1883
1884         return -1;
1885 }
1886
1887 static void nl80211_get_scancrypto(const char *spec,
1888         struct iwinfo_crypto_entry *c)
1889 {
1890         if (strstr(spec, "WPA") || strstr(spec, "WEP"))
1891         {
1892                 c->enabled = 1;
1893
1894                 if (strstr(spec, "WPA2-") && strstr(spec, "WPA-"))
1895                         c->wpa_version = 3;
1896
1897                 else if (strstr(spec, "WPA2"))
1898                         c->wpa_version = 2;
1899
1900                 else if (strstr(spec, "WPA"))
1901                         c->wpa_version = 1;
1902
1903                 else if (strstr(spec, "WEP"))
1904                         c->auth_algs = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
1905
1906
1907                 if (strstr(spec, "PSK"))
1908                         c->auth_suites |= IWINFO_KMGMT_PSK;
1909
1910                 if (strstr(spec, "802.1X") || strstr(spec, "EAP"))
1911                         c->auth_suites |= IWINFO_KMGMT_8021x;
1912
1913                 if (strstr(spec, "WPA-NONE"))
1914                         c->auth_suites |= IWINFO_KMGMT_NONE;
1915
1916
1917                 if (strstr(spec, "TKIP"))
1918                         c->pair_ciphers |= IWINFO_CIPHER_TKIP;
1919
1920                 if (strstr(spec, "CCMP"))
1921                         c->pair_ciphers |= IWINFO_CIPHER_CCMP;
1922
1923                 if (strstr(spec, "WEP-40"))
1924                         c->pair_ciphers |= IWINFO_CIPHER_WEP40;
1925
1926                 if (strstr(spec, "WEP-104"))
1927                         c->pair_ciphers |= IWINFO_CIPHER_WEP104;
1928
1929                 c->group_ciphers = c->pair_ciphers;
1930         }
1931         else
1932         {
1933                 c->enabled = 0;
1934         }
1935 }
1936
1937
1938 struct nl80211_scanlist {
1939         struct iwinfo_scanlist_entry *e;
1940         int len;
1941 };
1942
1943
1944 static void nl80211_get_scanlist_ie(struct nlattr **bss,
1945                                     struct iwinfo_scanlist_entry *e)
1946 {
1947         int ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
1948         unsigned char *ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
1949         static unsigned char ms_oui[3] = { 0x00, 0x50, 0xf2 };
1950         int len;
1951
1952         while (ielen >= 2 && ielen >= ie[1])
1953         {
1954                 switch (ie[0])
1955                 {
1956                 case 0: /* SSID */
1957                         len = min(ie[1], IWINFO_ESSID_MAX_SIZE);
1958                         memcpy(e->ssid, ie + 2, len);
1959                         e->ssid[len] = 0;
1960                         break;
1961
1962                 case 48: /* RSN */
1963                         iwinfo_parse_rsn(&e->crypto, ie + 2, ie[1],
1964                                          IWINFO_CIPHER_CCMP, IWINFO_KMGMT_8021x);
1965                         break;
1966
1967                 case 221: /* Vendor */
1968                         if (ie[1] >= 4 && !memcmp(ie + 2, ms_oui, 3) && ie[5] == 1)
1969                                 iwinfo_parse_rsn(&e->crypto, ie + 6, ie[1] - 4,
1970                                                  IWINFO_CIPHER_TKIP, IWINFO_KMGMT_PSK);
1971                         break;
1972                 }
1973
1974                 ielen -= ie[1] + 2;
1975                 ie += ie[1] + 2;
1976         }
1977 }
1978
1979 static int nl80211_get_scanlist_cb(struct nl_msg *msg, void *arg)
1980 {
1981         int8_t rssi;
1982         uint16_t caps;
1983
1984         struct nl80211_scanlist *sl = arg;
1985         struct nlattr **tb = nl80211_parse(msg);
1986         struct nlattr *bss[NL80211_BSS_MAX + 1];
1987
1988         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
1989                 [NL80211_BSS_TSF]                  = { .type = NLA_U64 },
1990                 [NL80211_BSS_FREQUENCY]            = { .type = NLA_U32 },
1991                 [NL80211_BSS_BSSID]                = { 0 },
1992                 [NL80211_BSS_BEACON_INTERVAL]      = { .type = NLA_U16 },
1993                 [NL80211_BSS_CAPABILITY]           = { .type = NLA_U16 },
1994                 [NL80211_BSS_INFORMATION_ELEMENTS] = { 0 },
1995                 [NL80211_BSS_SIGNAL_MBM]           = { .type = NLA_U32 },
1996                 [NL80211_BSS_SIGNAL_UNSPEC]        = { .type = NLA_U8  },
1997                 [NL80211_BSS_STATUS]               = { .type = NLA_U32 },
1998                 [NL80211_BSS_SEEN_MS_AGO]          = { .type = NLA_U32 },
1999                 [NL80211_BSS_BEACON_IES]           = { 0 },
2000         };
2001
2002         if (!tb[NL80211_ATTR_BSS] ||
2003                 nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
2004                                  bss_policy) ||
2005                 !bss[NL80211_BSS_BSSID])
2006         {
2007                 return NL_SKIP;
2008         }
2009
2010         if (bss[NL80211_BSS_CAPABILITY])
2011                 caps = nla_get_u16(bss[NL80211_BSS_CAPABILITY]);
2012         else
2013                 caps = 0;
2014
2015         memset(sl->e, 0, sizeof(*sl->e));
2016         memcpy(sl->e->mac, nla_data(bss[NL80211_BSS_BSSID]), 6);
2017
2018         if (caps & (1<<1))
2019                 sl->e->mode = IWINFO_OPMODE_ADHOC;
2020         else if (caps & (1<<0))
2021                 sl->e->mode = IWINFO_OPMODE_MASTER;
2022         else
2023                 sl->e->mode = IWINFO_OPMODE_MESHPOINT;
2024
2025         if (caps & (1<<4))
2026                 sl->e->crypto.enabled = 1;
2027
2028         if (bss[NL80211_BSS_FREQUENCY])
2029                 sl->e->channel = nl80211_freq2channel(nla_get_u32(
2030                         bss[NL80211_BSS_FREQUENCY]));
2031
2032         if (bss[NL80211_BSS_INFORMATION_ELEMENTS])
2033                 nl80211_get_scanlist_ie(bss, sl->e);
2034
2035         if (bss[NL80211_BSS_SIGNAL_MBM])
2036         {
2037                 sl->e->signal =
2038                         (uint8_t)((int32_t)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100);
2039
2040                 rssi = sl->e->signal - 0x100;
2041
2042                 if (rssi < -110)
2043                         rssi = -110;
2044                 else if (rssi > -40)
2045                         rssi = -40;
2046
2047                 sl->e->quality = (rssi + 110);
2048                 sl->e->quality_max = 70;
2049         }
2050
2051         if (sl->e->crypto.enabled && !sl->e->crypto.wpa_version)
2052         {
2053                 sl->e->crypto.auth_algs    = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
2054                 sl->e->crypto.pair_ciphers = IWINFO_CIPHER_WEP40 | IWINFO_CIPHER_WEP104;
2055         }
2056
2057         sl->e++;
2058         sl->len++;
2059
2060         return NL_SKIP;
2061 }
2062
2063 static int nl80211_get_scanlist_nl(const char *ifname, char *buf, int *len)
2064 {
2065         struct nl80211_scanlist sl = { .e = (struct iwinfo_scanlist_entry *)buf };
2066
2067         if (nl80211_request(ifname, NL80211_CMD_TRIGGER_SCAN, 0, NULL, NULL))
2068                 goto out;
2069
2070         if (nl80211_wait("nl80211", "scan", NL80211_CMD_NEW_SCAN_RESULTS))
2071                 goto out;
2072
2073         if (nl80211_request(ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
2074                             nl80211_get_scanlist_cb, &sl))
2075                 goto out;
2076
2077         *len = sl.len * sizeof(struct iwinfo_scanlist_entry);
2078         return 0;
2079
2080 out:
2081         *len = 0;
2082         return -1;
2083 }
2084
2085 static int wpasupp_ssid_decode(const char *in, char *out, int outlen)
2086 {
2087 #define hex(x) \
2088         (((x) >= 'a') ? ((x) - 'a' + 10) : \
2089                 (((x) >= 'A') ? ((x) - 'A' + 10) : ((x) - '0')))
2090
2091         int len = 0;
2092
2093         while (*in)
2094         {
2095                 if (len + 1 >= outlen)
2096                         break;
2097
2098                 switch (*in)
2099                 {
2100                 case '\\':
2101                         in++;
2102                         switch (*in)
2103                         {
2104                         case 'n':
2105                                 out[len++] = '\n'; in++;
2106                                 break;
2107
2108                         case 'r':
2109                                 out[len++] = '\r'; in++;
2110                                 break;
2111
2112                         case 't':
2113                                 out[len++] = '\t'; in++;
2114                                 break;
2115
2116                         case 'e':
2117                                 out[len++] = '\033'; in++;
2118                                 break;
2119
2120                         case 'x':
2121                                 if (isxdigit(*(in+1)) && isxdigit(*(in+2)))
2122                                         out[len++] = hex(*(in+1)) * 16 + hex(*(in+2));
2123                                 in += 3;
2124                                 break;
2125
2126                         default:
2127                                 out[len++] = *in++;
2128                                 break;
2129                         }
2130                         break;
2131
2132                 default:
2133                         out[len++] = *in++;
2134                         break;
2135                 }
2136         }
2137
2138         if (outlen > len)
2139                 out[len] = '\0';
2140
2141         return len;
2142 }
2143
2144 static int nl80211_get_scanlist_wpactl(const char *ifname, char *buf, int *len)
2145 {
2146         int sock, qmax, rssi, tries, count = -1, ready = 0;
2147         char *pos, *line, *bssid, *freq, *signal, *flags, *ssid, reply[4096];
2148         struct sockaddr_un local = { 0 };
2149         struct iwinfo_scanlist_entry *e = (struct iwinfo_scanlist_entry *)buf;
2150
2151         sock = nl80211_wpactl_connect(ifname, &local);
2152
2153         if (sock < 0)
2154                 return sock;
2155
2156         send(sock, "ATTACH", 6, 0);
2157         send(sock, "SCAN", 4, 0);
2158
2159         /*
2160          * wait for scan results:
2161          *   nl80211_wpactl_recv() will use a timeout of 256ms and we need to scan
2162          *   72 channels at most. We'll also receive two "OK" messages acknowledging
2163          *   the "ATTACH" and "SCAN" commands and the driver might need a bit extra
2164          *   time to process the results, so try 72 + 2 + 1 times.
2165          */
2166         for (tries = 0; tries < 75; tries++)
2167         {
2168                 if (nl80211_wpactl_recv(sock, reply, sizeof(reply)) <= 0)
2169                         continue;
2170
2171                 /* got an event notification */
2172                 if (reply[0] == '<')
2173                 {
2174                         /* scan results are ready */
2175                         if (strstr(reply, "CTRL-EVENT-SCAN-RESULTS"))
2176                         {
2177                                 /* send "SCAN_RESULTS" command */
2178                                 ready = (send(sock, "SCAN_RESULTS", 12, 0) == 12);
2179                                 break;
2180                         }
2181
2182                         /* is another unrelated event, retry */
2183                         tries--;
2184                 }
2185         }
2186
2187         /* receive and parse scan results if the wait above didn't time out */
2188         if (ready && nl80211_wpactl_recv(sock, reply, sizeof(reply)) > 0)
2189         {
2190                 nl80211_get_quality_max(ifname, &qmax);
2191
2192                 for (line = strtok_r(reply, "\n", &pos);
2193                      line != NULL;
2194                      line = strtok_r(NULL, "\n", &pos))
2195                 {
2196                         /* skip header line */
2197                         if (count < 0)
2198                         {
2199                                 count++;
2200                                 continue;
2201                         }
2202
2203                         bssid  = strtok(line, "\t");
2204                         freq   = strtok(NULL, "\t");
2205                         signal = strtok(NULL, "\t");
2206                         flags  = strtok(NULL, "\t");
2207                         ssid   = strtok(NULL, "\n");
2208
2209                         if (!bssid || !freq || !signal || !flags || !ssid)
2210                                 continue;
2211
2212                         /* BSSID */
2213                         e->mac[0] = strtol(&bssid[0],  NULL, 16);
2214                         e->mac[1] = strtol(&bssid[3],  NULL, 16);
2215                         e->mac[2] = strtol(&bssid[6],  NULL, 16);
2216                         e->mac[3] = strtol(&bssid[9],  NULL, 16);
2217                         e->mac[4] = strtol(&bssid[12], NULL, 16);
2218                         e->mac[5] = strtol(&bssid[15], NULL, 16);
2219
2220                         /* SSID */
2221                         wpasupp_ssid_decode(ssid, e->ssid, sizeof(e->ssid));
2222
2223                         /* Mode */
2224                         if (strstr(flags, "[MESH]"))
2225                                 e->mode = IWINFO_OPMODE_MESHPOINT;
2226                         else if (strstr(flags, "[IBSS]"))
2227                                 e->mode = IWINFO_OPMODE_ADHOC;
2228                         else
2229                                 e->mode = IWINFO_OPMODE_MASTER;
2230
2231                         /* Channel */
2232                         e->channel = nl80211_freq2channel(atoi(freq));
2233
2234                         /* Signal */
2235                         rssi = atoi(signal);
2236                         e->signal = rssi;
2237
2238                         /* Quality */
2239                         if (rssi < 0)
2240                         {
2241                                 /* The cfg80211 wext compat layer assumes a signal range
2242                                  * of -110 dBm to -40 dBm, the quality value is derived
2243                                  * by adding 110 to the signal level */
2244                                 if (rssi < -110)
2245                                         rssi = -110;
2246                                 else if (rssi > -40)
2247                                         rssi = -40;
2248
2249                                 e->quality = (rssi + 110);
2250                         }
2251                         else
2252                         {
2253                                 e->quality = rssi;
2254                         }
2255
2256                         /* Max. Quality */
2257                         e->quality_max = qmax;
2258
2259                         /* Crypto */
2260                         nl80211_get_scancrypto(flags, &e->crypto);
2261
2262                         count++;
2263                         e++;
2264                 }
2265
2266                 *len = count * sizeof(struct iwinfo_scanlist_entry);
2267         }
2268
2269         close(sock);
2270         unlink(local.sun_path);
2271
2272         return (count >= 0) ? 0 : -1;
2273 }
2274
2275 static int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
2276 {
2277         char *res;
2278         int rv, mode;
2279
2280         *len = 0;
2281
2282         /* Got a radioX pseudo interface, find some interface on it or create one */
2283         if (!strncmp(ifname, "radio", 5))
2284         {
2285                 /* Reuse existing interface */
2286                 if ((res = nl80211_phy2ifname(ifname)) != NULL)
2287                 {
2288                         return nl80211_get_scanlist(res, buf, len);
2289                 }
2290
2291                 /* Need to spawn a temporary iface for scanning */
2292                 else if ((res = nl80211_ifadd(ifname)) != NULL)
2293                 {
2294                         rv = nl80211_get_scanlist(res, buf, len);
2295                         nl80211_ifdel(res);
2296                         return rv;
2297                 }
2298         }
2299
2300         /* WPA supplicant */
2301         if (!nl80211_get_scanlist_wpactl(ifname, buf, len))
2302         {
2303                 return 0;
2304         }
2305
2306         /* station / ad-hoc / monitor scan */
2307         else if (!nl80211_get_mode(ifname, &mode) &&
2308                  (mode == IWINFO_OPMODE_ADHOC ||
2309                   mode == IWINFO_OPMODE_MASTER ||
2310                   mode == IWINFO_OPMODE_CLIENT ||
2311                   mode == IWINFO_OPMODE_MONITOR) &&
2312                  iwinfo_ifup(ifname))
2313         {
2314                 return nl80211_get_scanlist_nl(ifname, buf, len);
2315         }
2316
2317         /* AP scan */
2318         else
2319         {
2320                 /* Got a temp interface, don't create yet another one */
2321                 if (!strncmp(ifname, "tmp.", 4))
2322                 {
2323                         if (!iwinfo_ifup(ifname))
2324                                 return -1;
2325
2326                         rv = nl80211_get_scanlist_nl(ifname, buf, len);
2327                         iwinfo_ifdown(ifname);
2328                         return rv;
2329                 }
2330
2331                 /* Spawn a new scan interface */
2332                 else
2333                 {
2334                         if (!(res = nl80211_ifadd(ifname)))
2335                                 return -1;
2336
2337                         iwinfo_ifmac(res);
2338
2339                         /* if we can take the new interface up, the driver supports an
2340                          * additional interface and there's no need to tear down the ap */
2341                         if (iwinfo_ifup(res))
2342                         {
2343                                 rv = nl80211_get_scanlist_nl(res, buf, len);
2344                                 iwinfo_ifdown(res);
2345                         }
2346
2347                         /* driver cannot create secondary interface, take down ap
2348                          * during scan */
2349                         else if (iwinfo_ifdown(ifname) && iwinfo_ifup(res))
2350                         {
2351                                 rv = nl80211_get_scanlist_nl(res, buf, len);
2352                                 iwinfo_ifdown(res);
2353                                 iwinfo_ifup(ifname);
2354                                 nl80211_hostapd_hup(ifname);
2355                         }
2356
2357                         nl80211_ifdel(res);
2358                         return rv;
2359                 }
2360         }
2361
2362         return -1;
2363 }
2364
2365 static int nl80211_get_freqlist_cb(struct nl_msg *msg, void *arg)
2366 {
2367         int bands_remain, freqs_remain;
2368
2369         struct nl80211_array_buf *arr = arg;
2370         struct iwinfo_freqlist_entry *e;
2371
2372         struct nlattr **attr = nl80211_parse(msg);
2373         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
2374         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
2375         struct nlattr *band, *freq;
2376
2377         e = arr->buf;
2378         e += arr->count;
2379
2380         if (attr[NL80211_ATTR_WIPHY_BANDS]) {
2381                 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
2382                 {
2383                         nla_parse(bands, NL80211_BAND_ATTR_MAX,
2384                                   nla_data(band), nla_len(band), NULL);
2385
2386                         if (bands[NL80211_BAND_ATTR_FREQS]) {
2387                                 nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
2388                                 {
2389                                         nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
2390                                                   nla_data(freq), nla_len(freq), NULL);
2391
2392                                         if (!freqs[NL80211_FREQUENCY_ATTR_FREQ] ||
2393                                             freqs[NL80211_FREQUENCY_ATTR_DISABLED])
2394                                                 continue;
2395
2396                                         e->mhz = nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]);
2397                                         e->channel = nl80211_freq2channel(e->mhz);
2398
2399                                         e->restricted = (
2400                                                 freqs[NL80211_FREQUENCY_ATTR_NO_IR] &&
2401                                                 !freqs[NL80211_FREQUENCY_ATTR_RADAR]
2402                                         ) ? 1 : 0;
2403
2404                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_HT40_MINUS])
2405                                                 e->flags |= IWINFO_FREQ_NO_HT40MINUS;
2406                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_HT40_PLUS])
2407                                                 e->flags |= IWINFO_FREQ_NO_HT40PLUS;
2408                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_80MHZ])
2409                                                 e->flags |= IWINFO_FREQ_NO_80MHZ;
2410                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_160MHZ])
2411                                                 e->flags |= IWINFO_FREQ_NO_160MHZ;
2412                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_20MHZ])
2413                                                 e->flags |= IWINFO_FREQ_NO_20MHZ;
2414                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_10MHZ])
2415                                                 e->flags |= IWINFO_FREQ_NO_10MHZ;
2416
2417                                         e++;
2418                                         arr->count++;
2419                                 }
2420                         }
2421                 }
2422         }
2423
2424         return NL_SKIP;
2425 }
2426
2427 static int nl80211_get_freqlist(const char *ifname, char *buf, int *len)
2428 {
2429         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
2430
2431         if (nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
2432                             nl80211_get_freqlist_cb, &arr))
2433                 goto out;
2434
2435         *len = arr.count * sizeof(struct iwinfo_freqlist_entry);
2436         return 0;
2437
2438 out:
2439         *len = 0;
2440         return -1;
2441 }
2442
2443 static int nl80211_get_country_cb(struct nl_msg *msg, void *arg)
2444 {
2445         char *buf = arg;
2446         struct nlattr **attr = nl80211_parse(msg);
2447
2448         if (attr[NL80211_ATTR_REG_ALPHA2])
2449                 memcpy(buf, nla_data(attr[NL80211_ATTR_REG_ALPHA2]), 2);
2450         else
2451                 buf[0] = 0;
2452
2453         return NL_SKIP;
2454 }
2455
2456 static int nl80211_get_country(const char *ifname, char *buf)
2457 {
2458         if (nl80211_request(ifname, NL80211_CMD_GET_REG, 0,
2459                             nl80211_get_country_cb, buf))
2460                 return -1;
2461
2462         return 0;
2463 }
2464
2465 static int nl80211_get_countrylist(const char *ifname, char *buf, int *len)
2466 {
2467         int count;
2468         struct iwinfo_country_entry *e = (struct iwinfo_country_entry *)buf;
2469         const struct iwinfo_iso3166_label *l;
2470
2471         for (l = IWINFO_ISO3166_NAMES, count = 0; l->iso3166; l++, e++, count++)
2472         {
2473                 e->iso3166 = l->iso3166;
2474                 e->ccode[0] = (l->iso3166 / 256);
2475                 e->ccode[1] = (l->iso3166 % 256);
2476                 e->ccode[2] = 0;
2477         }
2478
2479         *len = (count * sizeof(struct iwinfo_country_entry));
2480         return 0;
2481 }
2482
2483
2484 struct nl80211_modes
2485 {
2486         bool ok;
2487         uint32_t hw;
2488         uint32_t ht;
2489 };
2490
2491 static int nl80211_get_modelist_cb(struct nl_msg *msg, void *arg)
2492 {
2493         struct nl80211_modes *m = arg;
2494         int bands_remain, freqs_remain;
2495         uint16_t caps = 0;
2496         uint32_t vht_caps = 0;
2497         struct nlattr **attr = nl80211_parse(msg);
2498         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
2499         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
2500         struct nlattr *band, *freq;
2501
2502         if (attr[NL80211_ATTR_WIPHY_BANDS])
2503         {
2504                 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
2505                 {
2506                         nla_parse(bands, NL80211_BAND_ATTR_MAX,
2507                                   nla_data(band), nla_len(band), NULL);
2508
2509                         if (bands[NL80211_BAND_ATTR_HT_CAPA])
2510                                 caps = nla_get_u16(bands[NL80211_BAND_ATTR_HT_CAPA]);
2511
2512                         /* Treat any nonzero capability as 11n */
2513                         if (caps > 0)
2514                         {
2515                                 m->hw |= IWINFO_80211_N;
2516                                 m->ht |= IWINFO_HTMODE_HT20;
2517
2518                                 if (caps & (1 << 1))
2519                                         m->ht |= IWINFO_HTMODE_HT40;
2520                         }
2521
2522                         nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS],
2523                                             freqs_remain)
2524                         {
2525                                 nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
2526                                           nla_data(freq), nla_len(freq), NULL);
2527
2528                                 if (!freqs[NL80211_FREQUENCY_ATTR_FREQ])
2529                                         continue;
2530
2531                                 if (nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]) < 2485)
2532                                 {
2533                                         m->hw |= IWINFO_80211_B;
2534                                         m->hw |= IWINFO_80211_G;
2535                                 }
2536                                 else if (bands[NL80211_BAND_ATTR_VHT_CAPA])
2537                                 {
2538                                         vht_caps = nla_get_u32(bands[NL80211_BAND_ATTR_VHT_CAPA]);
2539
2540                                         /* Treat any nonzero capability as 11ac */
2541                                         if (vht_caps > 0)
2542                                         {
2543                                                 m->hw |= IWINFO_80211_AC;
2544                                                 m->ht |= IWINFO_HTMODE_VHT20 | IWINFO_HTMODE_VHT40 | IWINFO_HTMODE_VHT80;
2545
2546                                                 switch ((vht_caps >> 2) & 3)
2547                                                 {
2548                                                 case 2:
2549                                                         m->ht |= IWINFO_HTMODE_VHT80_80;
2550                                                         /* fall through */
2551
2552                                                 case 1:
2553                                                         m->ht |= IWINFO_HTMODE_VHT160;
2554                                                 }
2555                                         }
2556                                 }
2557                                 else if (!(m->hw & IWINFO_80211_AC))
2558                                 {
2559                                         m->hw |= IWINFO_80211_A;
2560                                 }
2561                         }
2562                 }
2563
2564                 m->ok = 1;
2565         }
2566
2567         return NL_SKIP;
2568 }
2569
2570 static int nl80211_get_hwmodelist(const char *ifname, int *buf)
2571 {
2572         struct nl80211_modes m = { 0 };
2573
2574         if (nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
2575                             nl80211_get_modelist_cb, &m))
2576                 goto out;
2577
2578         if (!m.ok)
2579                 goto out;
2580
2581         *buf = m.hw;
2582         return 0;
2583
2584 out:
2585         *buf = 0;
2586         return -1;
2587 }
2588
2589 static int nl80211_get_htmodelist(const char *ifname, int *buf)
2590 {
2591         struct nl80211_modes m = { 0 };
2592
2593         if (nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
2594                             nl80211_get_modelist_cb, &m))
2595                 goto out;
2596
2597         if (!m.ok)
2598                 goto out;
2599
2600         *buf = m.ht;
2601         return 0;
2602
2603 out:
2604         *buf = 0;
2605         return -1;
2606 }
2607
2608
2609 static int nl80211_get_ifcomb_cb(struct nl_msg *msg, void *arg)
2610 {
2611         struct nlattr **attr = nl80211_parse(msg);
2612         struct nlattr *comb;
2613         int *ret = arg;
2614         int comb_rem, limit_rem, mode_rem;
2615
2616         *ret = 0;
2617         if (!attr[NL80211_ATTR_INTERFACE_COMBINATIONS])
2618                 return NL_SKIP;
2619
2620         nla_for_each_nested(comb, attr[NL80211_ATTR_INTERFACE_COMBINATIONS], comb_rem)
2621         {
2622                 static struct nla_policy iface_combination_policy[NUM_NL80211_IFACE_COMB] = {
2623                         [NL80211_IFACE_COMB_LIMITS] = { .type = NLA_NESTED },
2624                         [NL80211_IFACE_COMB_MAXNUM] = { .type = NLA_U32 },
2625                 };
2626                 struct nlattr *tb_comb[NUM_NL80211_IFACE_COMB+1];
2627                 static struct nla_policy iface_limit_policy[NUM_NL80211_IFACE_LIMIT] = {
2628                         [NL80211_IFACE_LIMIT_TYPES] = { .type = NLA_NESTED },
2629                         [NL80211_IFACE_LIMIT_MAX] = { .type = NLA_U32 },
2630                 };
2631                 struct nlattr *tb_limit[NUM_NL80211_IFACE_LIMIT+1];
2632                 struct nlattr *limit;
2633
2634                 nla_parse_nested(tb_comb, NUM_NL80211_IFACE_COMB, comb, iface_combination_policy);
2635
2636                 if (!tb_comb[NL80211_IFACE_COMB_LIMITS])
2637                         continue;
2638
2639                 nla_for_each_nested(limit, tb_comb[NL80211_IFACE_COMB_LIMITS], limit_rem)
2640                 {
2641                         struct nlattr *mode;
2642
2643                         nla_parse_nested(tb_limit, NUM_NL80211_IFACE_LIMIT, limit, iface_limit_policy);
2644
2645                         if (!tb_limit[NL80211_IFACE_LIMIT_TYPES] ||
2646                             !tb_limit[NL80211_IFACE_LIMIT_MAX])
2647                                 continue;
2648
2649                         if (nla_get_u32(tb_limit[NL80211_IFACE_LIMIT_MAX]) < 2)
2650                                 continue;
2651
2652                         nla_for_each_nested(mode, tb_limit[NL80211_IFACE_LIMIT_TYPES], mode_rem) {
2653                                 if (nla_type(mode) == NL80211_IFTYPE_AP)
2654                                         *ret = 1;
2655                         }
2656                 }
2657         }
2658
2659         return NL_SKIP;
2660 }
2661
2662 static int nl80211_get_mbssid_support(const char *ifname, int *buf)
2663 {
2664         if (nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
2665                             nl80211_get_ifcomb_cb, buf))
2666                 return -1;
2667
2668         return 0;
2669 }
2670
2671 static int nl80211_get_hardware_id(const char *ifname, char *buf)
2672 {
2673         int rv = -1;
2674         char *res;
2675
2676         /* Got a radioX pseudo interface, find some interface on it or create one */
2677         if (!strncmp(ifname, "radio", 5))
2678         {
2679                 /* Reuse existing interface */
2680                 if ((res = nl80211_phy2ifname(ifname)) != NULL)
2681                 {
2682                         rv = wext_ops.hardware_id(res, buf);
2683                 }
2684
2685                 /* Need to spawn a temporary iface for finding IDs */
2686                 else if ((res = nl80211_ifadd(ifname)) != NULL)
2687                 {
2688                         rv = wext_ops.hardware_id(res, buf);
2689                         nl80211_ifdel(res);
2690                 }
2691         }
2692         else
2693         {
2694                 rv = wext_ops.hardware_id(ifname, buf);
2695         }
2696
2697         /* Failed to obtain hardware IDs, search board config */
2698         if (rv)
2699         {
2700                 rv = iwinfo_hardware_id_from_mtd((struct iwinfo_hardware_id *)buf);
2701         }
2702
2703         return rv;
2704 }
2705
2706 static const struct iwinfo_hardware_entry *
2707 nl80211_get_hardware_entry(const char *ifname)
2708 {
2709         struct iwinfo_hardware_id id;
2710
2711         if (nl80211_get_hardware_id(ifname, (char *)&id))
2712                 return NULL;
2713
2714         return iwinfo_hardware(&id);
2715 }
2716
2717 static int nl80211_get_hardware_name(const char *ifname, char *buf)
2718 {
2719         const struct iwinfo_hardware_entry *hw;
2720
2721         if (!(hw = nl80211_get_hardware_entry(ifname)))
2722                 sprintf(buf, "Generic MAC80211");
2723         else
2724                 sprintf(buf, "%s %s", hw->vendor_name, hw->device_name);
2725
2726         return 0;
2727 }
2728
2729 static int nl80211_get_txpower_offset(const char *ifname, int *buf)
2730 {
2731         const struct iwinfo_hardware_entry *hw;
2732
2733         if (!(hw = nl80211_get_hardware_entry(ifname)))
2734                 return -1;
2735
2736         *buf = hw->txpower_offset;
2737         return 0;
2738 }
2739
2740 static int nl80211_get_frequency_offset(const char *ifname, int *buf)
2741 {
2742         const struct iwinfo_hardware_entry *hw;
2743
2744         if (!(hw = nl80211_get_hardware_entry(ifname)))
2745                 return -1;
2746
2747         *buf = hw->frequency_offset;
2748         return 0;
2749 }
2750
2751 static int nl80211_lookup_phyname(const char *section, char *buf)
2752 {
2753         int idx;
2754
2755         if ((idx = nl80211_phy_idx_from_uci(section)) < 0)
2756                 return -1;
2757
2758         sprintf(buf, "phy%d", idx);
2759         return 0;
2760 }
2761
2762 const struct iwinfo_ops nl80211_ops = {
2763         .name             = "nl80211",
2764         .probe            = nl80211_probe,
2765         .channel          = nl80211_get_channel,
2766         .frequency        = nl80211_get_frequency,
2767         .frequency_offset = nl80211_get_frequency_offset,
2768         .txpower          = nl80211_get_txpower,
2769         .txpower_offset   = nl80211_get_txpower_offset,
2770         .bitrate          = nl80211_get_bitrate,
2771         .signal           = nl80211_get_signal,
2772         .noise            = nl80211_get_noise,
2773         .quality          = nl80211_get_quality,
2774         .quality_max      = nl80211_get_quality_max,
2775         .mbssid_support   = nl80211_get_mbssid_support,
2776         .hwmodelist       = nl80211_get_hwmodelist,
2777         .htmodelist       = nl80211_get_htmodelist,
2778         .mode             = nl80211_get_mode,
2779         .ssid             = nl80211_get_ssid,
2780         .bssid            = nl80211_get_bssid,
2781         .country          = nl80211_get_country,
2782         .hardware_id      = nl80211_get_hardware_id,
2783         .hardware_name    = nl80211_get_hardware_name,
2784         .encryption       = nl80211_get_encryption,
2785         .phyname          = nl80211_get_phyname,
2786         .assoclist        = nl80211_get_assoclist,
2787         .txpwrlist        = nl80211_get_txpwrlist,
2788         .scanlist         = nl80211_get_scanlist,
2789         .freqlist         = nl80211_get_freqlist,
2790         .countrylist      = nl80211_get_countrylist,
2791         .lookup_phy       = nl80211_lookup_phyname,
2792         .close            = nl80211_close
2793 };