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