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Sources/iwinfo/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 #include <stdlib.h>
 30 
 31 #include "iwinfo_nl80211.h"
 32 
 33 #define min(x, y) ((x) < (y)) ? (x) : (y)
 34 
 35 #define BIT(x) (1ULL<<(x))
 36 
 37 static struct nl80211_state *nls = NULL;
 38 
 39 static void nl80211_close(void)
 40 {
 41         if (nls)
 42         {
 43                 if (nls->nlctrl)
 44                         genl_family_put(nls->nlctrl);
 45 
 46                 if (nls->nl80211)
 47                         genl_family_put(nls->nl80211);
 48 
 49                 if (nls->nl_sock)
 50                         nl_socket_free(nls->nl_sock);
 51 
 52                 if (nls->nl_cache)
 53                         nl_cache_free(nls->nl_cache);
 54 
 55                 free(nls);
 56                 nls = NULL;
 57         }
 58 }
 59 
 60 static int nl80211_init(void)
 61 {
 62         int err, fd;
 63 
 64         if (!nls)
 65         {
 66                 nls = malloc(sizeof(struct nl80211_state));
 67                 if (!nls) {
 68                         err = -ENOMEM;
 69                         goto err;
 70                 }
 71 
 72                 memset(nls, 0, sizeof(*nls));
 73 
 74                 nls->nl_sock = nl_socket_alloc();
 75                 if (!nls->nl_sock) {
 76                         err = -ENOMEM;
 77                         goto err;
 78                 }
 79 
 80                 if (genl_connect(nls->nl_sock)) {
 81                         err = -ENOLINK;
 82                         goto err;
 83                 }
 84 
 85                 fd = nl_socket_get_fd(nls->nl_sock);
 86                 if (fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC) < 0) {
 87                         err = -EINVAL;
 88                         goto err;
 89                 }
 90 
 91                 if (genl_ctrl_alloc_cache(nls->nl_sock, &nls->nl_cache)) {
 92                         err = -ENOMEM;
 93                         goto err;
 94                 }
 95 
 96                 nls->nl80211 = genl_ctrl_search_by_name(nls->nl_cache, "nl80211");
 97                 if (!nls->nl80211) {
 98                         err = -ENOENT;
 99                         goto err;
100                 }
101 
102                 nls->nlctrl = genl_ctrl_search_by_name(nls->nl_cache, "nlctrl");
103                 if (!nls->nlctrl) {
104                         err = -ENOENT;
105                         goto err;
106                 }
107         }
108 
109         return 0;
110 
111 
112 err:
113         nl80211_close();
114         return err;
115 }
116 
117 static int nl80211_readint(const char *path)
118 {
119         int fd;
120         int rv = -1;
121         char buffer[16];
122 
123         if ((fd = open(path, O_RDONLY)) > -1)
124         {
125                 if (read(fd, buffer, sizeof(buffer)) > 0)
126                         rv = atoi(buffer);
127 
128                 close(fd);
129         }
130 
131         return rv;
132 }
133 
134 static int nl80211_readstr(const char *path, char *buffer, int length)
135 {
136         int fd;
137         int rv = -1;
138 
139         if ((fd = open(path, O_RDONLY)) > -1)
140         {
141                 if ((rv = read(fd, buffer, length - 1)) > 0)
142                 {
143                         if (buffer[rv - 1] == '\n')
144                                 rv--;
145 
146                         buffer[rv] = 0;
147                 }
148 
149                 close(fd);
150         }
151 
152         return rv;
153 }
154 
155 
156 static int nl80211_msg_error(struct sockaddr_nl *nla,
157         struct nlmsgerr *err, void *arg)
158 {
159         int *ret = arg;
160         *ret = err->error;
161         return NL_STOP;
162 }
163 
164 static int nl80211_msg_finish(struct nl_msg *msg, void *arg)
165 {
166         int *ret = arg;
167         *ret = 0;
168         return NL_SKIP;
169 }
170 
171 static int nl80211_msg_ack(struct nl_msg *msg, void *arg)
172 {
173         int *ret = arg;
174         *ret = 0;
175         return NL_STOP;
176 }
177 
178 static int nl80211_msg_response(struct nl_msg *msg, void *arg)
179 {
180         return NL_SKIP;
181 }
182 
183 static void nl80211_free(struct nl80211_msg_conveyor *cv)
184 {
185         if (cv)
186         {
187                 if (cv->cb)
188                         nl_cb_put(cv->cb);
189 
190                 if (cv->msg)
191                         nlmsg_free(cv->msg);
192 
193                 cv->cb  = NULL;
194                 cv->msg = NULL;
195         }
196 }
197 
198 static struct nl80211_msg_conveyor * nl80211_new(struct genl_family *family,
199                                                  int cmd, int flags)
200 {
201         static struct nl80211_msg_conveyor cv;
202 
203         struct nl_msg *req = NULL;
204         struct nl_cb *cb = NULL;
205 
206         req = nlmsg_alloc();
207         if (!req)
208                 goto err;
209 
210         cb = nl_cb_alloc(NL_CB_DEFAULT);
211         if (!cb)
212                 goto err;
213 
214         genlmsg_put(req, 0, 0, genl_family_get_id(family), 0, flags, cmd, 0);
215 
216         cv.msg = req;
217         cv.cb  = cb;
218 
219         return &cv;
220 
221 err:
222         if (req)
223                 nlmsg_free(req);
224 
225         return NULL;
226 }
227 
228 static struct nl80211_msg_conveyor * nl80211_ctl(int cmd, int flags)
229 {
230         if (nl80211_init() < 0)
231                 return NULL;
232 
233         return nl80211_new(nls->nlctrl, cmd, flags);
234 }
235 
236 static int nl80211_phy_idx_from_uci_path(struct uci_section *s)
237 {
238         size_t linklen, pathlen;
239         char buf[128], *link;
240         struct dirent *e;
241         const char *path;
242         int idx = -1;
243         DIR *d;
244 
245         path = uci_lookup_option_string(uci_ctx, s, "path");
246         if (!path)
247                 return -1;
248 
249         if ((d = opendir("/sys/class/ieee80211")) != NULL)
250         {
251                 while ((e = readdir(d)) != NULL)
252                 {
253                         snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/device", e->d_name);
254 
255                         link = realpath(buf, NULL);
256 
257                         if (link == NULL)
258                                 continue;
259 
260                         linklen = strlen(link);
261                         pathlen = strlen(path);
262 
263                         if (pathlen >= linklen || strcmp(link + (linklen - pathlen), path))
264                                 linklen = 0;
265 
266                         free(link);
267 
268                         if (linklen == 0)
269                                 continue;
270 
271                         snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/index", e->d_name);
272 
273                         idx = nl80211_readint(buf);
274 
275                         if (idx >= 0)
276                                 break;
277                 }
278 
279                 closedir(d);
280         }
281 
282         return idx;
283 }
284 
285 static int nl80211_phy_idx_from_uci_macaddr(struct uci_section *s)
286 {
287         const char *opt;
288         char buf[128];
289         int i, idx = -1;
290         glob_t gl;
291 
292         opt = uci_lookup_option_string(uci_ctx, s, "macaddr");
293         if (!opt)
294                 return -1;
295 
296         snprintf(buf, sizeof(buf), "/sys/class/ieee80211/*");   /**/
297         if (glob(buf, 0, NULL, &gl))
298                 return -1;
299 
300         for (i = 0; i < gl.gl_pathc; i++)
301         {
302                 snprintf(buf, sizeof(buf), "%s/macaddress", gl.gl_pathv[i]);
303                 if (nl80211_readstr(buf, buf, sizeof(buf)) <= 0)
304                         continue;
305 
306                 if (fnmatch(opt, buf, FNM_CASEFOLD))
307                         continue;
308 
309                 snprintf(buf, sizeof(buf), "%s/index", gl.gl_pathv[i]);
310                 if ((idx = nl80211_readint(buf)) > -1)
311                         break;
312         }
313 
314         globfree(&gl);
315 
316         return idx;
317 }
318 
319 static int nl80211_phy_idx_from_uci_phy(struct uci_section *s)
320 {
321         const char *opt;
322         char buf[128];
323 
324         opt = uci_lookup_option_string(uci_ctx, s, "phy");
325         if (!opt)
326                 return -1;
327 
328         snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/index", opt);
329         return nl80211_readint(buf);
330 }
331 
332 static int nl80211_phy_idx_from_uci(const char *name)
333 {
334         struct uci_section *s;
335         int idx = -1;
336 
337         s = iwinfo_uci_get_radio(name, "mac80211");
338         if (!s)
339                 goto free;
340 
341         idx = nl80211_phy_idx_from_uci_path(s);
342 
343         if (idx < 0)
344                 idx = nl80211_phy_idx_from_uci_macaddr(s);
345 
346         if (idx < 0)
347                 idx = nl80211_phy_idx_from_uci_phy(s);
348 
349 free:
350         iwinfo_uci_free();
351         return idx;
352 }
353 
354 static struct nl80211_msg_conveyor * nl80211_msg(const char *ifname,
355                                                  int cmd, int flags)
356 {
357         int ifidx = -1, phyidx = -1;
358         struct nl80211_msg_conveyor *cv;
359 
360         if (ifname == NULL)
361                 return NULL;
362 
363         if (nl80211_init() < 0)
364                 return NULL;
365 
366         if (!strncmp(ifname, "phy", 3))
367                 phyidx = atoi(&ifname[3]);
368         else if (!strncmp(ifname, "radio", 5))
369                 phyidx = nl80211_phy_idx_from_uci(ifname);
370 
371         if (!strncmp(ifname, "mon.", 4))
372                 ifidx = if_nametoindex(&ifname[4]);
373         else
374                 ifidx = if_nametoindex(ifname);
375 
376         /* Valid ifidx must be greater than 0 */
377         if ((ifidx <= 0) && (phyidx < 0))
378                 return NULL;
379 
380         cv = nl80211_new(nls->nl80211, cmd, flags);
381         if (!cv)
382                 return NULL;
383 
384         if (ifidx > 0)
385                 NLA_PUT_U32(cv->msg, NL80211_ATTR_IFINDEX, ifidx);
386         else if (phyidx > -1)
387                 NLA_PUT_U32(cv->msg, NL80211_ATTR_WIPHY, phyidx);
388 
389         return cv;
390 
391 nla_put_failure:
392         nl80211_free(cv);
393         return NULL;
394 }
395 
396 static int nl80211_send(struct nl80211_msg_conveyor *cv,
397                         int (*cb_func)(struct nl_msg *, void *),
398                         void *cb_arg)
399 {
400         static struct nl80211_msg_conveyor rcv;
401         int err;
402 
403         if (cb_func)
404                 nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, cb_func, cb_arg);
405         else
406                 nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, nl80211_msg_response, &rcv);
407 
408         err = nl_send_auto_complete(nls->nl_sock, cv->msg);
409 
410         if (err < 0)
411                 goto out;
412 
413         err = 1;
414 
415         nl_cb_err(cv->cb,               NL_CB_CUSTOM, nl80211_msg_error,  &err);
416         nl_cb_set(cv->cb, NL_CB_FINISH, NL_CB_CUSTOM, nl80211_msg_finish, &err);
417         nl_cb_set(cv->cb, NL_CB_ACK,    NL_CB_CUSTOM, nl80211_msg_ack,    &err);
418 
419         while (err > 0)
420                 nl_recvmsgs(nls->nl_sock, cv->cb);
421 
422 out:
423         nl80211_free(cv);
424         return err;
425 }
426 
427 static int nl80211_request(const char *ifname, int cmd, int flags,
428                            int (*cb_func)(struct nl_msg *, void *),
429                            void *cb_arg)
430 {
431         struct nl80211_msg_conveyor *cv;
432 
433         cv = nl80211_msg(ifname, cmd, flags);
434 
435         if (!cv)
436                 return -ENOMEM;
437 
438         return nl80211_send(cv, cb_func, cb_arg);
439 }
440 
441 static struct nlattr ** nl80211_parse(struct nl_msg *msg)
442 {
443         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
444         static struct nlattr *attr[NL80211_ATTR_MAX + 1];
445 
446         nla_parse(attr, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
447                   genlmsg_attrlen(gnlh, 0), NULL);
448 
449         return attr;
450 }
451 
452 static int nl80211_get_protocol_features_cb(struct nl_msg *msg, void *arg)
453 {
454         uint32_t *features = arg;
455         struct nlattr **attr = nl80211_parse(msg);
456 
457         if (attr[NL80211_ATTR_PROTOCOL_FEATURES])
458                 *features = nla_get_u32(attr[NL80211_ATTR_PROTOCOL_FEATURES]);
459 
460         return NL_SKIP;
461 }
462 
463 static int nl80211_get_protocol_features(const char *ifname)
464 {
465         struct nl80211_msg_conveyor *req;
466         uint32_t features = 0;
467 
468         req = nl80211_msg(ifname, NL80211_CMD_GET_PROTOCOL_FEATURES, 0);
469         if (req) {
470                 nl80211_send(req, nl80211_get_protocol_features_cb, &features);
471                 nl80211_free(req);
472         }
473 
474         return features;
475 }
476 
477 static int nl80211_subscribe_cb(struct nl_msg *msg, void *arg)
478 {
479         struct nl80211_group_conveyor *cv = arg;
480 
481         struct nlattr **attr = nl80211_parse(msg);
482         struct nlattr *mgrpinfo[CTRL_ATTR_MCAST_GRP_MAX + 1];
483         struct nlattr *mgrp;
484         int mgrpidx;
485 
486         if (!attr[CTRL_ATTR_MCAST_GROUPS])
487                 return NL_SKIP;
488 
489         nla_for_each_nested(mgrp, attr[CTRL_ATTR_MCAST_GROUPS], mgrpidx)
490         {
491                 nla_parse(mgrpinfo, CTRL_ATTR_MCAST_GRP_MAX,
492                           nla_data(mgrp), nla_len(mgrp), NULL);
493 
494                 if (mgrpinfo[CTRL_ATTR_MCAST_GRP_ID] &&
495                     mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME] &&
496                     !strncmp(nla_data(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME]),
497                              cv->name, nla_len(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME])))
498                 {
499                         cv->id = nla_get_u32(mgrpinfo[CTRL_ATTR_MCAST_GRP_ID]);
500                         break;
501                 }
502         }
503 
504         return NL_SKIP;
505 }
506 
507 static int nl80211_subscribe(const char *family, const char *group)
508 {
509         struct nl80211_group_conveyor cv = { .name = group, .id = -ENOENT };
510         struct nl80211_msg_conveyor *req;
511         int err;
512 
513         req = nl80211_ctl(CTRL_CMD_GETFAMILY, 0);
514         if (req)
515         {
516                 NLA_PUT_STRING(req->msg, CTRL_ATTR_FAMILY_NAME, family);
517                 err = nl80211_send(req, nl80211_subscribe_cb, &cv);
518 
519                 if (err)
520                         return err;
521 
522                 return nl_socket_add_membership(nls->nl_sock, cv.id);
523 
524 nla_put_failure:
525                 nl80211_free(req);
526         }
527 
528         return -ENOMEM;
529 }
530 
531 
532 static int nl80211_wait_cb(struct nl_msg *msg, void *arg)
533 {
534         struct nl80211_event_conveyor *cv = arg;
535         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
536 
537         if (cv->wait[gnlh->cmd / 32] & (1 << (gnlh->cmd % 32)))
538                 cv->recv = gnlh->cmd;
539 
540         return NL_SKIP;
541 }
542 
543 static int nl80211_wait_seq_check(struct nl_msg *msg, void *arg)
544 {
545         return NL_OK;
546 }
547 
548 static int __nl80211_wait(const char *family, const char *group, ...)
549 {
550         struct nl80211_event_conveyor cv = { };
551         struct nl_cb *cb;
552         int err = 0;
553         int cmd;
554         va_list ap;
555 
556         if (nl80211_subscribe(family, group))
557                 return -ENOENT;
558 
559         cb = nl_cb_alloc(NL_CB_DEFAULT);
560 
561         if (!cb)
562                 return -ENOMEM;
563 
564         nl_cb_err(cb,                  NL_CB_CUSTOM, nl80211_msg_error,      &err);
565         nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, nl80211_wait_seq_check, NULL);
566         nl_cb_set(cb, NL_CB_VALID,     NL_CB_CUSTOM, nl80211_wait_cb,        &cv );
567 
568         va_start(ap, group);
569 
570         for (cmd = va_arg(ap, int); cmd != 0; cmd = va_arg(ap, int))
571                 cv.wait[cmd / 32] |= (1 << (cmd % 32));
572 
573         va_end(ap);
574 
575         while (!cv.recv && !err)
576                 nl_recvmsgs(nls->nl_sock, cb);
577 
578         nl_cb_put(cb);
579 
580         return err;
581 }
582 
583 #define nl80211_wait(family, group, ...) \
584         __nl80211_wait(family, group, __VA_ARGS__, 0)
585 
586 
587 static int nl80211_freq2channel(int freq)
588 {
589         if (freq == 2484)
590                 return 14;
591         else if (freq < 2484)
592                 return (freq - 2407) / 5;
593         else if (freq >= 4910 && freq <= 4980)
594                 return (freq - 4000) / 5;
595         else if(freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6)
596                 return (freq - 56160) / 2160;
597         else
598                 return (freq - 5000) / 5;
599 }
600 
601 static int nl80211_channel2freq(int channel, const char *band)
602 {
603         if (!band || band[0] != 'a')
604         {
605                 if (channel == 14)
606                         return 2484;
607                 else if (channel < 14)
608                         return (channel * 5) + 2407;
609         }
610         else if ( strcmp(band, "ad") == 0)
611         {
612                 return 56160 + 2160 * channel;
613         }
614         else
615         {
616                 if (channel >= 182 && channel <= 196)
617                         return (channel * 5) + 4000;
618                 else
619                         return (channel * 5) + 5000;
620         }
621 
622         return 0;
623 }
624 
625 static int nl80211_ifname2phy_cb(struct nl_msg *msg, void *arg)
626 {
627         char *buf = arg;
628         struct nlattr **attr = nl80211_parse(msg);
629 
630         if (attr[NL80211_ATTR_WIPHY_NAME])
631                 memcpy(buf, nla_data(attr[NL80211_ATTR_WIPHY_NAME]),
632                        nla_len(attr[NL80211_ATTR_WIPHY_NAME]));
633         else
634                 buf[0] = 0;
635 
636         return NL_SKIP;
637 }
638 
639 static char * nl80211_ifname2phy(const char *ifname)
640 {
641         static char phy[32] = { 0 };
642 
643         memset(phy, 0, sizeof(phy));
644 
645         nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
646                         nl80211_ifname2phy_cb, phy);
647 
648         return phy[0] ? phy : NULL;
649 }
650 
651 static char * nl80211_phy2ifname(const char *ifname)
652 {
653         int ifidx = -1, cifidx = -1, phyidx = -1;
654         char buffer[64];
655         static char nif[IFNAMSIZ] = { 0 };
656 
657         DIR *d;
658         struct dirent *e;
659 
660         /* Only accept phy name of the form phy%d or radio%d */
661         if (!ifname)
662                 return NULL;
663         else if (!strncmp(ifname, "phy", 3))
664                 phyidx = atoi(&ifname[3]);
665         else if (!strncmp(ifname, "radio", 5))
666                 phyidx = nl80211_phy_idx_from_uci(ifname);
667         else
668                 return NULL;
669 
670         memset(nif, 0, sizeof(nif));
671 
672         if (phyidx > -1)
673         {
674                 if ((d = opendir("/sys/class/net")) != NULL)
675                 {
676                         while ((e = readdir(d)) != NULL)
677                         {
678                                 snprintf(buffer, sizeof(buffer),
679                                          "/sys/class/net/%s/phy80211/index", e->d_name);
680 
681                                 if (nl80211_readint(buffer) == phyidx)
682                                 {
683                                         snprintf(buffer, sizeof(buffer),
684                                                  "/sys/class/net/%s/ifindex", e->d_name);
685 
686                                         if ((cifidx = nl80211_readint(buffer)) >= 0 &&
687                                             ((ifidx < 0) || (cifidx < ifidx)))
688                                         {
689                                                 ifidx = cifidx;
690                                                 strncpy(nif, e->d_name, sizeof(nif) - 1);
691                                         }
692                                 }
693                         }
694 
695                         closedir(d);
696                 }
697         }
698 
699         return nif[0] ? nif : NULL;
700 }
701 
702 static int nl80211_get_mode_cb(struct nl_msg *msg, void *arg)
703 {
704         int *mode = arg;
705         struct nlattr **tb = nl80211_parse(msg);
706         const int ifmodes[NL80211_IFTYPE_MAX + 1] = {
707                 IWINFO_OPMODE_UNKNOWN,          /* unspecified */
708                 IWINFO_OPMODE_ADHOC,            /* IBSS */
709                 IWINFO_OPMODE_CLIENT,           /* managed */
710                 IWINFO_OPMODE_MASTER,           /* AP */
711                 IWINFO_OPMODE_AP_VLAN,          /* AP/VLAN */
712                 IWINFO_OPMODE_WDS,                      /* WDS */
713                 IWINFO_OPMODE_MONITOR,          /* monitor */
714                 IWINFO_OPMODE_MESHPOINT,        /* mesh point */
715                 IWINFO_OPMODE_P2P_CLIENT,       /* P2P-client */
716                 IWINFO_OPMODE_P2P_GO,           /* P2P-GO */
717         };
718 
719         if (tb[NL80211_ATTR_IFTYPE])
720                 *mode = ifmodes[nla_get_u32(tb[NL80211_ATTR_IFTYPE])];
721 
722         return NL_SKIP;
723 }
724 
725 
726 static int nl80211_get_mode(const char *ifname, int *buf)
727 {
728         char *res;
729 
730         *buf = IWINFO_OPMODE_UNKNOWN;
731 
732         res = nl80211_phy2ifname(ifname);
733 
734         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
735                         nl80211_get_mode_cb, buf);
736 
737         return (*buf == IWINFO_OPMODE_UNKNOWN) ? -1 : 0;
738 }
739 
740 static int __nl80211_hostapd_query(const char *ifname, ...)
741 {
742         va_list ap, ap_cur;
743         char *phy, *search, *dest, *key, *val, buf[128];
744         int len, mode, found = 0, match = 1;
745         FILE *fp;
746 
747         if (nl80211_get_mode(ifname, &mode))
748                 return 0;
749 
750         if (mode != IWINFO_OPMODE_MASTER && mode != IWINFO_OPMODE_AP_VLAN)
751                 return 0;
752 
753         phy = nl80211_ifname2phy(ifname);
754 
755         if (!phy)
756                 return 0;
757 
758         snprintf(buf, sizeof(buf), "/var/run/hostapd-%s.conf", phy);
759         fp = fopen(buf, "r");
760 
761         if (!fp)
762                 return 0;
763 
764         va_start(ap, ifname);
765 
766         /* clear all destination buffers */
767         va_copy(ap_cur, ap);
768 
769         while ((search = va_arg(ap_cur, char *)) != NULL)
770         {
771                 dest = va_arg(ap_cur, char *);
772                 len  = va_arg(ap_cur, int);
773 
774                 memset(dest, 0, len);
775         }
776 
777         va_end(ap_cur);
778 
779         /* iterate applicable lines and copy found values into dest buffers */
780         while (fgets(buf, sizeof(buf), fp))
781         {
782                 key = strtok(buf, " =\t\n");
783                 val = strtok(NULL, "\n");
784 
785                 if (!key || !val || !*key || *key == '#')
786                         continue;
787 
788                 if (!strcmp(key, "interface") || !strcmp(key, "bss"))
789                         match = !strcmp(ifname, val);
790 
791                 if (!match)
792                         continue;
793 
794                 va_copy(ap_cur, ap);
795 
796                 while ((search = va_arg(ap_cur, char *)) != NULL)
797                 {
798                         dest = va_arg(ap_cur, char *);
799                         len  = va_arg(ap_cur, int);
800 
801                         if (!strcmp(search, key))
802                         {
803                                 strncpy(dest, val, len - 1);
804                                 found++;
805                                 break;
806                         }
807                 }
808 
809                 va_end(ap_cur);
810         }
811 
812         fclose(fp);
813 
814         va_end(ap);
815 
816         return found;
817 }
818 
819 #define nl80211_hostapd_query(ifname, ...) \
820         __nl80211_hostapd_query(ifname, ##__VA_ARGS__, NULL)
821 
822 
823 static inline int nl80211_wpactl_recv(int sock, char *buf, int blen)
824 {
825         fd_set rfds;
826         struct timeval tv = { 0, 256000 };
827 
828         FD_ZERO(&rfds);
829         FD_SET(sock, &rfds);
830 
831         memset(buf, 0, blen);
832 
833         if (select(sock + 1, &rfds, NULL, NULL, &tv) < 0)
834                 return -1;
835 
836         if (!FD_ISSET(sock, &rfds))
837                 return -1;
838 
839         return recv(sock, buf, blen - 1, 0);
840 }
841 
842 static int nl80211_wpactl_connect(const char *ifname, struct sockaddr_un *local)
843 {
844         struct sockaddr_un remote = { 0 };
845         size_t remote_length, local_length;
846 
847         int sock = socket(PF_UNIX, SOCK_DGRAM, 0);
848         if (sock < 0)
849                 return sock;
850 
851         remote.sun_family = AF_UNIX;
852         remote_length = sizeof(remote.sun_family) +
853                 sprintf(remote.sun_path, "/var/run/wpa_supplicant-%s/%s",
854                         ifname, ifname);
855 
856         if (fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC) < 0)
857         {
858                 close(sock);
859                 return -1;
860         }
861 
862         if (connect(sock, (struct sockaddr *)&remote, remote_length))
863         {
864                 remote_length = sizeof(remote.sun_family) +
865                         sprintf(remote.sun_path, "/var/run/wpa_supplicant/%s", ifname);
866 
867                 if (connect(sock, (struct sockaddr *)&remote, remote_length))
868                 {
869                         close(sock);
870                         return -1;
871                 }
872         }
873 
874         local->sun_family = AF_UNIX;
875         local_length = sizeof(local->sun_family) +
876                 sprintf(local->sun_path, "/var/run/iwinfo-%s-%d", ifname, getpid());
877 
878         if (bind(sock, (struct sockaddr *)local, local_length) < 0)
879         {
880                 close(sock);
881                 return -1;
882         }
883 
884         return sock;
885 }
886 
887 static int __nl80211_wpactl_query(const char *ifname, ...)
888 {
889         va_list ap, ap_cur;
890         struct sockaddr_un local = { 0 };
891         int len, mode, found = 0, sock = -1;
892         char *search, *dest, *key, *val, *line, *pos, buf[512];
893 
894         if (nl80211_get_mode(ifname, &mode))
895                 return 0;
896 
897         if (mode != IWINFO_OPMODE_CLIENT &&
898             mode != IWINFO_OPMODE_ADHOC &&
899             mode != IWINFO_OPMODE_MESHPOINT)
900                 return 0;
901 
902         sock = nl80211_wpactl_connect(ifname, &local);
903 
904         if (sock < 0)
905                 return 0;
906 
907         va_start(ap, ifname);
908 
909         /* clear all destination buffers */
910         va_copy(ap_cur, ap);
911 
912         while ((search = va_arg(ap_cur, char *)) != NULL)
913         {
914                 dest = va_arg(ap_cur, char *);
915                 len  = va_arg(ap_cur, int);
916 
917                 memset(dest, 0, len);
918         }
919 
920         va_end(ap_cur);
921 
922         send(sock, "STATUS", 6, 0);
923 
924         while (true)
925         {
926                 if (nl80211_wpactl_recv(sock, buf, sizeof(buf)) <= 0)
927                         break;
928 
929                 if (buf[0] == '<')
930                         continue;
931 
932                 for (line = strtok_r(buf, "\n", &pos);
933                          line != NULL;
934                          line = strtok_r(NULL, "\n", &pos))
935                 {
936                         key = strtok(line, "=");
937                         val = strtok(NULL, "\n");
938 
939                         if (!key || !val)
940                                 continue;
941 
942                         va_copy(ap_cur, ap);
943 
944                         while ((search = va_arg(ap_cur, char *)) != NULL)
945                         {
946                                 dest = va_arg(ap_cur, char *);
947                                 len  = va_arg(ap_cur, int);
948 
949                                 if (!strcmp(search, key))
950                                 {
951                                         strncpy(dest, val, len - 1);
952                                         found++;
953                                         break;
954                                 }
955                         }
956 
957                         va_end(ap_cur);
958                 }
959 
960                 break;
961         }
962 
963         va_end(ap);
964 
965         close(sock);
966         unlink(local.sun_path);
967 
968         return found;
969 }
970 
971 #define nl80211_wpactl_query(ifname, ...) \
972         __nl80211_wpactl_query(ifname, ##__VA_ARGS__, NULL)
973 
974 
975 static char * nl80211_ifadd(const char *ifname)
976 {
977         char path[PATH_MAX];
978         static char nif[IFNAMSIZ] = { 0 };
979         struct nl80211_msg_conveyor *req;
980         FILE *sysfs;
981 
982         req = nl80211_msg(ifname, NL80211_CMD_NEW_INTERFACE, 0);
983         if (req)
984         {
985                 snprintf(nif, sizeof(nif), "tmp.%s", ifname);
986 
987                 NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, nif);
988                 NLA_PUT_U32(req->msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_STATION);
989 
990                 nl80211_send(req, NULL, NULL);
991 
992                 snprintf(path, sizeof(path) - 1,
993                          "/proc/sys/net/ipv6/conf/%s/disable_ipv6", nif);
994 
995                 if ((sysfs = fopen(path, "w")) != NULL)
996                 {
997                         fwrite("\n", 1, 2, sysfs);
998                         fclose(sysfs);
999                 }
1000 
1001                 return nif;
1002 
1003         nla_put_failure:
1004                 nl80211_free(req);
1005         }
1006 
1007         return NULL;
1008 }
1009 
1010 static void nl80211_ifdel(const char *ifname)
1011 {
1012         struct nl80211_msg_conveyor *req;
1013         int err;
1014 
1015         req = nl80211_msg(ifname, NL80211_CMD_DEL_INTERFACE, 0);
1016         if (req)
1017         {
1018                 NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, ifname);
1019 
1020                 nl80211_send(req, NULL, NULL);
1021                 return;
1022 
1023         nla_put_failure:
1024                 nl80211_free(req);
1025         }
1026 }
1027 
1028 static void nl80211_hostapd_hup(const char *ifname)
1029 {
1030         int fd, pid = 0;
1031         char buf[32];
1032         char *phy = nl80211_ifname2phy(ifname);
1033 
1034         if (phy)
1035         {
1036                 snprintf(buf, sizeof(buf), "/var/run/wifi-%s.pid", phy);
1037                 if ((fd = open(buf, O_RDONLY)) >= 0)
1038                 {
1039                         if (read(fd, buf, sizeof(buf)) > 0)
1040                                 pid = atoi(buf);
1041 
1042                         close(fd);
1043                 }
1044 
1045                 if (pid > 0)
1046                         kill(pid, 1);
1047         }
1048 }
1049 
1050 
1051 static int nl80211_probe(const char *ifname)
1052 {
1053         return !!nl80211_ifname2phy(ifname);
1054 }
1055 
1056 struct nl80211_ssid_bssid {
1057         unsigned char *ssid;
1058         unsigned char bssid[7];
1059 };
1060 
1061 static int nl80211_get_macaddr_cb(struct nl_msg *msg, void *arg)
1062 {
1063         struct nl80211_ssid_bssid *sb = arg;
1064         struct nlattr **tb = nl80211_parse(msg);
1065 
1066         if (tb[NL80211_ATTR_MAC]) {
1067                 sb->bssid[0] = 1;
1068                 memcpy(sb->bssid + 1, nla_data(tb[NL80211_ATTR_MAC]),
1069                        sizeof(sb->bssid) - 1);
1070         }
1071 
1072         return NL_SKIP;
1073 }
1074 
1075 static int nl80211_get_ssid_bssid_cb(struct nl_msg *msg, void *arg)
1076 {
1077         int ielen;
1078         unsigned char *ie;
1079         struct nl80211_ssid_bssid *sb = arg;
1080         struct nlattr **tb = nl80211_parse(msg);
1081         struct nlattr *bss[NL80211_BSS_MAX + 1];
1082 
1083         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
1084                 [NL80211_BSS_INFORMATION_ELEMENTS] = { 0 },
1085                 [NL80211_BSS_STATUS]               = { .type = NLA_U32 },
1086         };
1087 
1088         if (!tb[NL80211_ATTR_BSS] ||
1089             nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
1090                              bss_policy) ||
1091             !bss[NL80211_BSS_BSSID] ||
1092             !bss[NL80211_BSS_STATUS] ||
1093             !bss[NL80211_BSS_INFORMATION_ELEMENTS])
1094         {
1095                 return NL_SKIP;
1096         }
1097 
1098         switch (nla_get_u32(bss[NL80211_BSS_STATUS]))
1099         {
1100         case NL80211_BSS_STATUS_ASSOCIATED:
1101         case NL80211_BSS_STATUS_AUTHENTICATED:
1102         case NL80211_BSS_STATUS_IBSS_JOINED:
1103 
1104                 if (sb->ssid)
1105                 {
1106                         ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
1107                         ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
1108 
1109                         while (ielen >= 2 && ielen >= ie[1])
1110                         {
1111                                 if (ie[0] == 0)
1112                                 {
1113                                         memcpy(sb->ssid, ie + 2, min(ie[1], IWINFO_ESSID_MAX_SIZE));
1114                                         return NL_SKIP;
1115                                 }
1116 
1117                                 ielen -= ie[1] + 2;
1118                                 ie += ie[1] + 2;
1119                         }
1120                 }
1121                 else
1122                 {
1123                         sb->bssid[0] = 1;
1124                         memcpy(sb->bssid + 1, nla_data(bss[NL80211_BSS_BSSID]), 6);
1125                         return NL_SKIP;
1126                 }
1127 
1128         default:
1129                 return NL_SKIP;
1130         }
1131 }
1132 
1133 static int nl80211_get_ssid(const char *ifname, char *buf)
1134 {
1135         char *res;
1136         struct nl80211_ssid_bssid sb = { .ssid = (unsigned char *)buf };
1137 
1138         /* try to find ssid from scan dump results */
1139         res = nl80211_phy2ifname(ifname);
1140         sb.ssid[0] = 0;
1141 
1142         nl80211_request(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1143                         nl80211_get_ssid_bssid_cb, &sb);
1144 
1145         /* failed, try to find from hostapd info */
1146         if (sb.ssid[0] == 0)
1147                 nl80211_hostapd_query(ifname, "ssid", sb.ssid,
1148                                       IWINFO_ESSID_MAX_SIZE + 1);
1149 
1150         /* failed, try to obtain Mesh ID */
1151         if (sb.ssid[0] == 0)
1152                 iwinfo_ubus_query(res ? res : ifname, "mesh_id",
1153                                   sb.ssid, IWINFO_ESSID_MAX_SIZE + 1);
1154 
1155         return (sb.ssid[0] == 0) ? -1 : 0;
1156 }
1157 
1158 static int nl80211_get_bssid(const char *ifname, char *buf)
1159 {
1160         char *res, bssid[sizeof("FF:FF:FF:FF:FF:FF\0")];
1161         struct nl80211_ssid_bssid sb = { };
1162 
1163         res = nl80211_phy2ifname(ifname);
1164 
1165         /* try to obtain mac address via NL80211_CMD_GET_INTERFACE */
1166         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1167                         nl80211_get_macaddr_cb, &sb);
1168 
1169         /* failed, try to find bssid from scan dump results */
1170         if (sb.bssid[0] == 0)
1171                 nl80211_request(res ? res : ifname,
1172                                 NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1173                                 nl80211_get_ssid_bssid_cb, &sb);
1174 
1175         /* failed, try to find mac from hostapd info */
1176         if ((sb.bssid[0] == 0) &&
1177             nl80211_hostapd_query(ifname, "bssid", bssid, sizeof(bssid)))
1178         {
1179                 sb.bssid[0] = 1;
1180                 sb.bssid[1] = strtol(&bssid[0],  NULL, 16);
1181                 sb.bssid[2] = strtol(&bssid[3],  NULL, 16);
1182                 sb.bssid[3] = strtol(&bssid[6],  NULL, 16);
1183                 sb.bssid[4] = strtol(&bssid[9],  NULL, 16);
1184                 sb.bssid[5] = strtol(&bssid[12], NULL, 16);
1185                 sb.bssid[6] = strtol(&bssid[15], NULL, 16);
1186         }
1187 
1188         if (sb.bssid[0])
1189         {
1190                 sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
1191                         sb.bssid[1], sb.bssid[2], sb.bssid[3],
1192                         sb.bssid[4], sb.bssid[5], sb.bssid[6]);
1193 
1194                 return 0;
1195         }
1196 
1197         return -1;
1198 }
1199 
1200 
1201 static int nl80211_get_frequency_scan_cb(struct nl_msg *msg, void *arg)
1202 {
1203         int *freq = arg;
1204         struct nlattr **attr = nl80211_parse(msg);
1205         struct nlattr *binfo[NL80211_BSS_MAX + 1];
1206 
1207         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
1208                 [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
1209                 [NL80211_BSS_STATUS]    = { .type = NLA_U32 },
1210         };
1211 
1212         if (attr[NL80211_ATTR_BSS] &&
1213             !nla_parse_nested(binfo, NL80211_BSS_MAX,
1214                               attr[NL80211_ATTR_BSS], bss_policy))
1215         {
1216                 if (binfo[NL80211_BSS_STATUS] && binfo[NL80211_BSS_FREQUENCY])
1217                         *freq = nla_get_u32(binfo[NL80211_BSS_FREQUENCY]);
1218         }
1219 
1220         return NL_SKIP;
1221 }
1222 
1223 static int nl80211_get_frequency_info_cb(struct nl_msg *msg, void *arg)
1224 {
1225         int *freq = arg;
1226         struct nlattr **tb = nl80211_parse(msg);
1227 
1228         if (tb[NL80211_ATTR_WIPHY_FREQ])
1229                 *freq = nla_get_u32(tb[NL80211_ATTR_WIPHY_FREQ]);
1230 
1231         return NL_SKIP;
1232 }
1233 
1234 static int nl80211_get_frequency(const char *ifname, int *buf)
1235 {
1236         char *res, channel[4], hwmode[3];
1237 
1238         /* try to find frequency from interface info */
1239         res = nl80211_phy2ifname(ifname);
1240         *buf = 0;
1241 
1242         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1243                         nl80211_get_frequency_info_cb, buf);
1244 
1245         /* failed, try to find frequency from hostapd info */
1246         if ((*buf == 0) &&
1247             nl80211_hostapd_query(ifname, "hw_mode", hwmode, sizeof(hwmode),
1248                                           "channel", channel, sizeof(channel)) == 2)
1249         {
1250                 *buf = nl80211_channel2freq(atoi(channel), hwmode);
1251         }
1252 
1253         /* failed, try to find frequency from scan results */
1254         if (*buf == 0)
1255         {
1256                 res = nl80211_phy2ifname(ifname);
1257 
1258                 nl80211_request(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1259                                 nl80211_get_frequency_scan_cb, buf);
1260         }
1261 
1262         return (*buf == 0) ? -1 : 0;
1263 }
1264 
1265 static int nl80211_get_center_freq1_cb(struct nl_msg *msg, void *arg)
1266 {
1267         int *freq = arg;
1268         struct nlattr **tb = nl80211_parse(msg);
1269 
1270         if (tb[NL80211_ATTR_CENTER_FREQ1])
1271                 *freq = nla_get_u32(tb[NL80211_ATTR_CENTER_FREQ1]);
1272 
1273         return NL_SKIP;
1274 }
1275 
1276 static int nl80211_get_center_freq1(const char *ifname, int *buf)
1277 {
1278         char *res;
1279 
1280         /* try to find frequency from interface info */
1281         res = nl80211_phy2ifname(ifname);
1282         *buf = 0;
1283 
1284         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1285                         nl80211_get_center_freq1_cb, buf);
1286 
1287         return (*buf == 0) ? -1 : 0;
1288 }
1289 
1290 static int nl80211_get_center_freq2_cb(struct nl_msg *msg, void *arg)
1291 {
1292         int *freq = arg;
1293         struct nlattr **tb = nl80211_parse(msg);
1294 
1295         if (tb[NL80211_ATTR_CENTER_FREQ2])
1296                 *freq = nla_get_u32(tb[NL80211_ATTR_CENTER_FREQ2]);
1297 
1298         return NL_SKIP;
1299 }
1300 
1301 static int nl80211_get_center_freq2(const char *ifname, int *buf)
1302 {
1303         char *res;
1304 
1305         /* try to find frequency from interface info */
1306         res = nl80211_phy2ifname(ifname);
1307         *buf = 0;
1308 
1309         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1310                         nl80211_get_center_freq2_cb, buf);
1311 
1312         return (*buf == 0) ? -1 : 0;
1313 }
1314 
1315 static int nl80211_get_channel(const char *ifname, int *buf)
1316 {
1317         if (!nl80211_get_frequency(ifname, buf))
1318         {
1319                 *buf = nl80211_freq2channel(*buf);
1320                 return 0;
1321         }
1322 
1323         return -1;
1324 }
1325 
1326 static int nl80211_get_center_chan1(const char *ifname, int *buf)
1327 {
1328         if (!nl80211_get_center_freq1(ifname, buf))
1329         {
1330                 *buf = nl80211_freq2channel(*buf);
1331                 return 0;
1332         }
1333 
1334         return -1;
1335 }
1336 
1337 static int nl80211_get_center_chan2(const char *ifname, int *buf)
1338 {
1339         if (!nl80211_get_center_freq2(ifname, buf))
1340         {
1341                 *buf = nl80211_freq2channel(*buf);
1342                 return 0;
1343         }
1344 
1345         return -1;
1346 }
1347 
1348 static int nl80211_get_txpower_cb(struct nl_msg *msg, void *arg)
1349 {
1350         int *buf = arg;
1351         struct nlattr **tb = nl80211_parse(msg);
1352 
1353         if (tb[NL80211_ATTR_WIPHY_TX_POWER_LEVEL])
1354                 *buf = iwinfo_mbm2dbm(nla_get_u32(tb[NL80211_ATTR_WIPHY_TX_POWER_LEVEL]));
1355 
1356         return NL_SKIP;
1357 }
1358 
1359 static int nl80211_get_txpower(const char *ifname, int *buf)
1360 {
1361         char *res;
1362 
1363         res = nl80211_phy2ifname(ifname);
1364         *buf = 0;
1365 
1366         if (nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1367                             nl80211_get_txpower_cb, buf))
1368                 return -1;
1369 
1370         return 0;
1371 }
1372 
1373 
1374 static int nl80211_fill_signal_cb(struct nl_msg *msg, void *arg)
1375 {
1376         int8_t dbm;
1377         int16_t mbit;
1378         struct nl80211_rssi_rate *rr = arg;
1379         struct nlattr **attr = nl80211_parse(msg);
1380         struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
1381         struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
1382 
1383         static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
1384                 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32    },
1385                 [NL80211_STA_INFO_RX_BYTES]      = { .type = NLA_U32    },
1386                 [NL80211_STA_INFO_TX_BYTES]      = { .type = NLA_U32    },
1387                 [NL80211_STA_INFO_RX_PACKETS]    = { .type = NLA_U32    },
1388                 [NL80211_STA_INFO_TX_PACKETS]    = { .type = NLA_U32    },
1389                 [NL80211_STA_INFO_SIGNAL]        = { .type = NLA_U8     },
1390                 [NL80211_STA_INFO_TX_BITRATE]    = { .type = NLA_NESTED },
1391                 [NL80211_STA_INFO_LLID]          = { .type = NLA_U16    },
1392                 [NL80211_STA_INFO_PLID]          = { .type = NLA_U16    },
1393                 [NL80211_STA_INFO_PLINK_STATE]   = { .type = NLA_U8     },
1394         };
1395 
1396         static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
1397                 [NL80211_RATE_INFO_BITRATE]      = { .type = NLA_U16  },
1398                 [NL80211_RATE_INFO_MCS]          = { .type = NLA_U8   },
1399                 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG },
1400                 [NL80211_RATE_INFO_SHORT_GI]     = { .type = NLA_FLAG },
1401         };
1402 
1403         if (attr[NL80211_ATTR_STA_INFO])
1404         {
1405                 if (!nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
1406                                       attr[NL80211_ATTR_STA_INFO], stats_policy))
1407                 {
1408                         if (sinfo[NL80211_STA_INFO_SIGNAL])
1409                         {
1410                                 dbm = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
1411                                 rr->rssi = (rr->rssi * rr->rssi_samples + dbm) / (rr->rssi_samples + 1);
1412                                 rr->rssi_samples++;
1413                         }
1414 
1415                         if (sinfo[NL80211_STA_INFO_TX_BITRATE])
1416                         {
1417                                 if (!nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
1418                                                       sinfo[NL80211_STA_INFO_TX_BITRATE],
1419                                                       rate_policy))
1420                                 {
1421                                         if (rinfo[NL80211_RATE_INFO_BITRATE])
1422                                         {
1423                                                 mbit = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]);
1424                                                 rr->rate = (rr->rate * rr->rate_samples + mbit) / (rr->rate_samples + 1);
1425                                                 rr->rate_samples++;
1426                                         }
1427                                 }
1428                         }
1429                 }
1430         }
1431 
1432         return NL_SKIP;
1433 }
1434 
1435 static void nl80211_fill_signal(const char *ifname, struct nl80211_rssi_rate *r)
1436 {
1437         DIR *d;
1438         struct dirent *de;
1439 
1440         memset(r, 0, sizeof(*r));
1441 
1442         if ((d = opendir("/sys/class/net")) != NULL)
1443         {
1444                 while ((de = readdir(d)) != NULL)
1445                 {
1446                         if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
1447                             (!de->d_name[strlen(ifname)] ||
1448                              !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
1449                         {
1450                                 nl80211_request(de->d_name, NL80211_CMD_GET_STATION,
1451                                                 NLM_F_DUMP, nl80211_fill_signal_cb, r);
1452                         }
1453                 }
1454 
1455                 closedir(d);
1456         }
1457 }
1458 
1459 static int nl80211_get_bitrate(const char *ifname, int *buf)
1460 {
1461         struct nl80211_rssi_rate rr;
1462 
1463         nl80211_fill_signal(ifname, &rr);
1464 
1465         if (rr.rate_samples)
1466         {
1467                 *buf = (rr.rate * 100);
1468                 return 0;
1469         }
1470 
1471         return -1;
1472 }
1473 
1474 static int nl80211_get_signal(const char *ifname, int *buf)
1475 {
1476         struct nl80211_rssi_rate rr;
1477 
1478         nl80211_fill_signal(ifname, &rr);
1479 
1480         if (rr.rssi_samples)
1481         {
1482                 *buf = rr.rssi;
1483                 return 0;
1484         }
1485 
1486         return -1;
1487 }
1488 
1489 static int nl80211_get_noise_cb(struct nl_msg *msg, void *arg)
1490 {
1491         int8_t *noise = arg;
1492         struct nlattr **tb = nl80211_parse(msg);
1493         struct nlattr *si[NL80211_SURVEY_INFO_MAX + 1];
1494 
1495         static struct nla_policy sp[NL80211_SURVEY_INFO_MAX + 1] = {
1496                 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
1497                 [NL80211_SURVEY_INFO_NOISE]     = { .type = NLA_U8  },
1498         };
1499 
1500         if (!tb[NL80211_ATTR_SURVEY_INFO])
1501                 return NL_SKIP;
1502 
1503         if (nla_parse_nested(si, NL80211_SURVEY_INFO_MAX,
1504                              tb[NL80211_ATTR_SURVEY_INFO], sp))
1505                 return NL_SKIP;
1506 
1507         if (!si[NL80211_SURVEY_INFO_NOISE])
1508                 return NL_SKIP;
1509 
1510         if (!*noise || si[NL80211_SURVEY_INFO_IN_USE])
1511                 *noise = (int8_t)nla_get_u8(si[NL80211_SURVEY_INFO_NOISE]);
1512 
1513         return NL_SKIP;
1514 }
1515 
1516 
1517 static int nl80211_get_noise(const char *ifname, int *buf)
1518 {
1519         int8_t noise = 0;
1520 
1521         if (nl80211_request(ifname, NL80211_CMD_GET_SURVEY, NLM_F_DUMP,
1522                             nl80211_get_noise_cb, &noise))
1523                 goto out;
1524 
1525         *buf = noise;
1526         return 0;
1527 
1528 out:
1529         *buf = 0;
1530         return -1;
1531 }
1532 
1533 static int nl80211_get_quality(const char *ifname, int *buf)
1534 {
1535         int signal;
1536 
1537         if (!nl80211_get_signal(ifname, &signal))
1538         {
1539                 /* A positive signal level is usually just a quality
1540                  * value, pass through as-is */
1541                 if (signal >= 0)
1542                 {
1543                         *buf = signal;
1544                 }
1545 
1546                 /* The cfg80211 wext compat layer assumes a signal range
1547                  * of -110 dBm to -40 dBm, the quality value is derived
1548                  * by adding 110 to the signal level */
1549                 else
1550                 {
1551                         if (signal < -110)
1552                                 signal = -110;
1553                         else if (signal > -40)
1554                                 signal = -40;
1555 
1556                         *buf = (signal + 110);
1557                 }
1558 
1559                 return 0;
1560         }
1561 
1562         return -1;
1563 }
1564 
1565 static int nl80211_get_quality_max(const char *ifname, int *buf)
1566 {
1567         /* The cfg80211 wext compat layer assumes a maximum
1568          * quality of 70 */
1569         *buf = 70;
1570 
1571         return 0;
1572 }
1573 
1574 static int nl80211_check_wepkey(const char *key)
1575 {
1576         if (key && *key)
1577         {
1578                 switch (strlen(key))
1579                 {
1580                 case 5:
1581                 case 10:
1582                         return IWINFO_CIPHER_WEP40;
1583 
1584                 case 13:
1585                 case 26:
1586                         return IWINFO_CIPHER_WEP104;
1587                 }
1588         }
1589 
1590         return 0;
1591 }
1592 
1593 static struct {
1594         const char *match;
1595         int version;
1596         int suite;
1597 } wpa_key_mgmt_strings[] = {
1598         { "IEEE 802.1X/EAP", 0, IWINFO_KMGMT_8021x },
1599         { "EAP-SUITE-B-192", 4, IWINFO_KMGMT_8021x },
1600         { "EAP-SUITE-B",     4, IWINFO_KMGMT_8021x },
1601         { "EAP-SHA256",      0, IWINFO_KMGMT_8021x },
1602         { "PSK-SHA256",      0, IWINFO_KMGMT_PSK },
1603         { "NONE",            0, IWINFO_KMGMT_NONE },
1604         { "None",            0, IWINFO_KMGMT_NONE },
1605         { "PSK",             0, IWINFO_KMGMT_PSK },
1606         { "EAP",             0, IWINFO_KMGMT_8021x },
1607         { "SAE",             4, IWINFO_KMGMT_SAE },
1608         { "OWE",             4, IWINFO_KMGMT_OWE }
1609 };
1610 
1611 static void parse_wpa_suites(const char *str, int defversion,
1612                              uint8_t *versions, uint8_t *suites)
1613 {
1614         size_t l;
1615         int i, version;
1616         const char *p, *q, *m, *sep = " \t\n,-+/";
1617 
1618         for (p = str; *p; )
1619         {
1620                 q = p;
1621 
1622                 for (i = 0; i < ARRAY_SIZE(wpa_key_mgmt_strings); i++)
1623                 {
1624                         m = wpa_key_mgmt_strings[i].match;
1625                         l = strlen(m);
1626 
1627                         if (!strncmp(q, m, l) && (!q[l] || strchr(sep, q[l])))
1628                         {
1629                                 if (wpa_key_mgmt_strings[i].version != 0)
1630                                         version = wpa_key_mgmt_strings[i].version;
1631                                 else
1632                                         version = defversion;
1633 
1634                                 *versions |= version;
1635                                 *suites |= wpa_key_mgmt_strings[i].suite;
1636 
1637                                 q += l;
1638                                 break;
1639                         }
1640                 }
1641 
1642                 if (q == p)
1643                         q += strcspn(q, sep);
1644 
1645                 p = q + strspn(q, sep);
1646         }
1647 }
1648 
1649 static struct {
1650         const char *match;
1651         int cipher;
1652 } wpa_cipher_strings[] = {
1653         { "WEP-104", IWINFO_CIPHER_WEP104 },
1654         { "WEP-40",  IWINFO_CIPHER_WEP40 },
1655         { "NONE",    IWINFO_CIPHER_NONE },
1656         { "TKIP",    IWINFO_CIPHER_TKIP },
1657         { "CCMP",    IWINFO_CIPHER_CCMP },
1658         { "GCMP",    IWINFO_CIPHER_GCMP }
1659 };
1660 
1661 static void parse_wpa_ciphers(const char *str, uint16_t *ciphers)
1662 {
1663         int i;
1664         size_t l;
1665         const char *m, *p, *q, *sep = " \t\n,-+/";
1666 
1667         for (p = str; *p; )
1668         {
1669                 q = p;
1670 
1671                 for (i = 0; i < ARRAY_SIZE(wpa_cipher_strings); i++)
1672                 {
1673                         m = wpa_cipher_strings[i].match;
1674                         l = strlen(m);
1675 
1676                         if (!strncmp(q, m, l) && (!q[l] || strchr(sep, q[l])))
1677                         {
1678                                 *ciphers |= wpa_cipher_strings[i].cipher;
1679 
1680                                 q += l;
1681                                 break;
1682                         }
1683                 }
1684 
1685                 if (q == p)
1686                         q += strcspn(q, sep);
1687 
1688                 p = q + strspn(q, sep);
1689         }
1690 }
1691 
1692 static int nl80211_get_encryption(const char *ifname, char *buf)
1693 {
1694         char *p;
1695         int opmode;
1696         uint8_t wpa_version = 0;
1697         char wpa[2], wpa_key_mgmt[64], wpa_pairwise[16], wpa_groupwise[16];
1698         char auth_algs[2], wep_key0[27], wep_key1[27], wep_key2[27], wep_key3[27];
1699         char mode[16];
1700 
1701         struct iwinfo_crypto_entry *c = (struct iwinfo_crypto_entry *)buf;
1702 
1703         /* WPA supplicant */
1704         if (nl80211_wpactl_query(ifname,
1705                         "pairwise_cipher", wpa_pairwise,  sizeof(wpa_pairwise),
1706                         "group_cipher",    wpa_groupwise, sizeof(wpa_groupwise),
1707                         "key_mgmt",        wpa_key_mgmt,  sizeof(wpa_key_mgmt),
1708                         "mode",            mode,          sizeof(mode)))
1709         {
1710                 /* WEP or Open */
1711                 if (!strcmp(wpa_key_mgmt, "NONE"))
1712                 {
1713                         parse_wpa_ciphers(wpa_pairwise, &c->pair_ciphers);
1714                         parse_wpa_ciphers(wpa_groupwise, &c->group_ciphers);
1715 
1716                         if (c->pair_ciphers != 0 && c->pair_ciphers != IWINFO_CIPHER_NONE) {
1717                                 c->enabled     = 1;
1718                                 c->auth_suites = IWINFO_KMGMT_NONE;
1719                                 c->auth_algs   = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
1720                         }
1721                         else {
1722                                 c->pair_ciphers = 0;
1723                                 c->group_ciphers = 0;
1724                         }
1725                 }
1726 
1727                 /* MESH with SAE */
1728                 else if (!strcmp(mode, "mesh") && !strcmp(wpa_key_mgmt, "UNKNOWN"))
1729                 {
1730                         c->enabled = 1;
1731                         c->wpa_version = 4;
1732                         c->auth_suites = IWINFO_KMGMT_SAE;
1733                         c->pair_ciphers = IWINFO_CIPHER_CCMP;
1734                         c->group_ciphers = IWINFO_CIPHER_CCMP;
1735                 }
1736 
1737                 /* WPA */
1738                 else
1739                 {
1740                         parse_wpa_ciphers(wpa_pairwise, &c->pair_ciphers);
1741                         parse_wpa_ciphers(wpa_groupwise, &c->group_ciphers);
1742 
1743                         p = wpa_key_mgmt;
1744 
1745                         if (!strncmp(p, "WPA2-", 5) || !strncmp(p, "WPA2/", 5))
1746                         {
1747                                 p += 5;
1748                                 wpa_version = 2;
1749                         }
1750                         else if (!strncmp(p, "WPA-", 4))
1751                         {
1752                                 p += 4;
1753                                 wpa_version = 1;
1754                         }
1755 
1756                         parse_wpa_suites(p, wpa_version, &c->wpa_version, &c->auth_suites);
1757 
1758                         c->enabled = !!(c->wpa_version && c->auth_suites);
1759                 }
1760 
1761                 return 0;
1762         }
1763 
1764         /* Hostapd */
1765         else if (nl80211_hostapd_query(ifname,
1766                                 "wpa",          wpa,          sizeof(wpa),
1767                                 "wpa_key_mgmt", wpa_key_mgmt, sizeof(wpa_key_mgmt),
1768                                 "wpa_pairwise", wpa_pairwise, sizeof(wpa_pairwise),
1769                                 "auth_algs",    auth_algs,    sizeof(auth_algs),
1770                                 "wep_key0",     wep_key0,     sizeof(wep_key0),
1771                                 "wep_key1",     wep_key1,     sizeof(wep_key1),
1772                                 "wep_key2",     wep_key2,     sizeof(wep_key2),
1773                                 "wep_key3",     wep_key3,     sizeof(wep_key3)))
1774         {
1775                 c->wpa_version = 0;
1776 
1777                 if (wpa_key_mgmt[0])
1778                 {
1779                         for (p = strtok(wpa_key_mgmt, " \t"); p != NULL; p = strtok(NULL, " \t"))
1780                         {
1781                                 if (!strncmp(p, "WPA-", 4))
1782                                         p += 4;
1783 
1784                                 parse_wpa_suites(p, atoi(wpa), &c->wpa_version, &c->auth_suites);
1785                         }
1786 
1787                         c->enabled = c->wpa_version ? 1 : 0;
1788                 }
1789 
1790                 if (wpa_pairwise[0])
1791                         parse_wpa_ciphers(wpa_pairwise, &c->pair_ciphers);
1792 
1793                 if (auth_algs[0])
1794                 {
1795                         switch (atoi(auth_algs))
1796                         {
1797                         case 1:
1798                                 c->auth_algs |= IWINFO_AUTH_OPEN;
1799                                 break;
1800 
1801                         case 2:
1802                                 c->auth_algs |= IWINFO_AUTH_SHARED;
1803                                 break;
1804 
1805                         case 3:
1806                                 c->auth_algs |= IWINFO_AUTH_OPEN;
1807                                 c->auth_algs |= IWINFO_AUTH_SHARED;
1808                                 break;
1809                         }
1810 
1811                         c->pair_ciphers |= nl80211_check_wepkey(wep_key0);
1812                         c->pair_ciphers |= nl80211_check_wepkey(wep_key1);
1813                         c->pair_ciphers |= nl80211_check_wepkey(wep_key2);
1814                         c->pair_ciphers |= nl80211_check_wepkey(wep_key3);
1815 
1816                         c->enabled = (c->auth_algs && c->pair_ciphers) ? 1 : 0;
1817                 }
1818 
1819                 c->group_ciphers = c->pair_ciphers;
1820 
1821                 return 0;
1822         }
1823 
1824         /* Ad-Hoc or Mesh interfaces without wpa_supplicant are open */
1825         else if (!nl80211_get_mode(ifname, &opmode) &&
1826                  (opmode == IWINFO_OPMODE_ADHOC ||
1827                   opmode == IWINFO_OPMODE_MESHPOINT))
1828         {
1829                 c->enabled = 0;
1830 
1831                 return 0;
1832         }
1833 
1834 
1835         return -1;
1836 }
1837 
1838 static int nl80211_get_phyname(const char *ifname, char *buf)
1839 {
1840         const char *name;
1841 
1842         name = nl80211_ifname2phy(ifname);
1843 
1844         if (name)
1845         {
1846                 strcpy(buf, name);
1847                 return 0;
1848         }
1849         else if ((name = nl80211_phy2ifname(ifname)) != NULL)
1850         {
1851                 name = nl80211_ifname2phy(name);
1852 
1853                 if (name)
1854                 {
1855                         strcpy(buf, ifname);
1856                         return 0;
1857                 }
1858         }
1859 
1860         return -1;
1861 }
1862 
1863 
1864 static void nl80211_parse_rateinfo(struct nlattr **ri,
1865                                    struct iwinfo_rate_entry *re)
1866 {
1867         if (ri[NL80211_RATE_INFO_BITRATE32])
1868                 re->rate = nla_get_u32(ri[NL80211_RATE_INFO_BITRATE32]) * 100;
1869         else if (ri[NL80211_RATE_INFO_BITRATE])
1870                 re->rate = nla_get_u16(ri[NL80211_RATE_INFO_BITRATE]) * 100;
1871 
1872         if (ri[NL80211_RATE_INFO_VHT_MCS])
1873         {
1874                 re->is_vht = 1;
1875                 re->mcs = nla_get_u8(ri[NL80211_RATE_INFO_VHT_MCS]);
1876 
1877                 if (ri[NL80211_RATE_INFO_VHT_NSS])
1878                         re->nss = nla_get_u8(ri[NL80211_RATE_INFO_VHT_NSS]);
1879         }
1880         else if (ri[NL80211_RATE_INFO_MCS])
1881         {
1882                 re->is_ht = 1;
1883                 re->mcs = nla_get_u8(ri[NL80211_RATE_INFO_MCS]);
1884         }
1885 
1886         if (ri[NL80211_RATE_INFO_5_MHZ_WIDTH])
1887                 re->mhz = 5;
1888         else if (ri[NL80211_RATE_INFO_10_MHZ_WIDTH])
1889                 re->mhz = 10;
1890         else if (ri[NL80211_RATE_INFO_40_MHZ_WIDTH])
1891                 re->mhz = 40;
1892         else if (ri[NL80211_RATE_INFO_80_MHZ_WIDTH])
1893                 re->mhz = 80;
1894         else if (ri[NL80211_RATE_INFO_80P80_MHZ_WIDTH] ||
1895                  ri[NL80211_RATE_INFO_160_MHZ_WIDTH])
1896                 re->mhz = 160;
1897         else
1898                 re->mhz = 20;
1899 
1900         if (ri[NL80211_RATE_INFO_SHORT_GI])
1901                 re->is_short_gi = 1;
1902 
1903         re->is_40mhz = (re->mhz == 40);
1904 }
1905 
1906 static int nl80211_get_survey_cb(struct nl_msg *msg, void *arg)
1907 {
1908         struct nl80211_array_buf *arr = arg;
1909         struct iwinfo_survey_entry *e = arr->buf;
1910         struct nlattr **attr = nl80211_parse(msg);
1911         struct nlattr *sinfo[NL80211_SURVEY_INFO_MAX + 1];
1912         int rc;
1913 
1914         static struct nla_policy survey_policy[NL80211_SURVEY_INFO_MAX + 1] = {
1915                 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
1916                 [NL80211_SURVEY_INFO_NOISE]  = { .type = NLA_U8     },
1917                 [NL80211_SURVEY_INFO_TIME] = { .type = NLA_U64   },
1918                 [NL80211_SURVEY_INFO_TIME_BUSY] = { .type = NLA_U64   },
1919                 [NL80211_SURVEY_INFO_TIME_EXT_BUSY] = { .type = NLA_U64   },
1920                 [NL80211_SURVEY_INFO_TIME_RX] = { .type = NLA_U64   },
1921                 [NL80211_SURVEY_INFO_TIME_TX] = { .type = NLA_U64   },
1922         };
1923 
1924         rc = nla_parse_nested(sinfo, NL80211_SURVEY_INFO_MAX,
1925                                 attr[NL80211_ATTR_SURVEY_INFO],
1926                                 survey_policy);
1927         if (rc)
1928                 return NL_SKIP;
1929 
1930         /* advance to end of array */
1931         e += arr->count;
1932         memset(e, 0, sizeof(*e));
1933 
1934         if (sinfo[NL80211_SURVEY_INFO_FREQUENCY])
1935                 e->mhz = nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]);
1936 
1937         if (sinfo[NL80211_SURVEY_INFO_NOISE])
1938                 e->noise = nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]);
1939 
1940         if (sinfo[NL80211_SURVEY_INFO_TIME])
1941                 e->active_time = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME]);
1942 
1943         if (sinfo[NL80211_SURVEY_INFO_TIME_BUSY])
1944                 e->busy_time = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_BUSY]);
1945 
1946         if (sinfo[NL80211_SURVEY_INFO_TIME_EXT_BUSY])
1947                 e->busy_time_ext = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_EXT_BUSY]);
1948 
1949         if (sinfo[NL80211_SURVEY_INFO_TIME_RX])
1950                 e->rxtime = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_RX]);
1951 
1952         if (sinfo[NL80211_SURVEY_INFO_TIME_TX])
1953                 e->txtime = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_TX]);
1954 
1955         arr->count++;
1956         return NL_SKIP;
1957 }
1958 
1959 
1960 static void plink_state_to_str(char *dst, unsigned state)
1961 {
1962         switch (state) {
1963         case NL80211_PLINK_LISTEN:
1964                 strcpy(dst, "LISTEN");
1965                 break;
1966         case NL80211_PLINK_OPN_SNT:
1967                 strcpy(dst, "OPN_SNT");
1968                 break;
1969         case NL80211_PLINK_OPN_RCVD:
1970                 strcpy(dst, "OPN_RCVD");
1971                 break;
1972         case NL80211_PLINK_CNF_RCVD:
1973                 strcpy(dst, "CNF_RCVD");
1974                 break;
1975         case NL80211_PLINK_ESTAB:
1976                 strcpy(dst, "ESTAB");
1977                 break;
1978         case NL80211_PLINK_HOLDING:
1979                 strcpy(dst, "HOLDING");
1980                 break;
1981         case NL80211_PLINK_BLOCKED:
1982                 strcpy(dst, "BLOCKED");
1983                 break;
1984         default:
1985                 strcpy(dst, "UNKNOWN");
1986                 break;
1987         }
1988 }
1989 
1990 static void power_mode_to_str(char *dst, struct nlattr *a)
1991 {
1992         enum nl80211_mesh_power_mode pm = nla_get_u32(a);
1993 
1994         switch (pm) {
1995         case NL80211_MESH_POWER_ACTIVE:
1996                 strcpy(dst, "ACTIVE");
1997                 break;
1998         case NL80211_MESH_POWER_LIGHT_SLEEP:
1999                 strcpy(dst, "LIGHT SLEEP");
2000                 break;
2001         case NL80211_MESH_POWER_DEEP_SLEEP:
2002                 strcpy(dst, "DEEP SLEEP");
2003                 break;
2004         default:
2005                 strcpy(dst, "UNKNOWN");
2006                 break;
2007         }
2008 }
2009 
2010 static int nl80211_get_assoclist_cb(struct nl_msg *msg, void *arg)
2011 {
2012         struct nl80211_array_buf *arr = arg;
2013         struct iwinfo_assoclist_entry *e = arr->buf;
2014         struct nlattr **attr = nl80211_parse(msg);
2015         struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
2016         struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
2017         struct nl80211_sta_flag_update *sta_flags;
2018 
2019         static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
2020                 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32    },
2021                 [NL80211_STA_INFO_RX_PACKETS]    = { .type = NLA_U32    },
2022                 [NL80211_STA_INFO_TX_PACKETS]    = { .type = NLA_U32    },
2023                 [NL80211_STA_INFO_RX_BITRATE]    = { .type = NLA_NESTED },
2024                 [NL80211_STA_INFO_TX_BITRATE]    = { .type = NLA_NESTED },
2025                 [NL80211_STA_INFO_SIGNAL]        = { .type = NLA_U8     },
2026                 [NL80211_STA_INFO_SIGNAL_AVG]    = { .type = NLA_U8     },
2027                 [NL80211_STA_INFO_RX_BYTES]      = { .type = NLA_U32    },
2028                 [NL80211_STA_INFO_TX_BYTES]      = { .type = NLA_U32    },
2029                 [NL80211_STA_INFO_TX_RETRIES]    = { .type = NLA_U32    },
2030                 [NL80211_STA_INFO_TX_FAILED]     = { .type = NLA_U32    },
2031                 [NL80211_STA_INFO_CONNECTED_TIME]= { .type = NLA_U32    },
2032                 [NL80211_STA_INFO_RX_DROP_MISC]  = { .type = NLA_U64    },
2033                 [NL80211_STA_INFO_T_OFFSET]      = { .type = NLA_U64    },
2034                 [NL80211_STA_INFO_STA_FLAGS] =
2035                         { .minlen = sizeof(struct nl80211_sta_flag_update) },
2036                 [NL80211_STA_INFO_EXPECTED_THROUGHPUT]   = { .type = NLA_U32    },
2037                 /* mesh */
2038                 [NL80211_STA_INFO_LLID]          = { .type = NLA_U16    },
2039                 [NL80211_STA_INFO_PLID]          = { .type = NLA_U16    },
2040                 [NL80211_STA_INFO_PLINK_STATE]   = { .type = NLA_U8     },
2041                 [NL80211_STA_INFO_LOCAL_PM]      = { .type = NLA_U32    },
2042                 [NL80211_STA_INFO_PEER_PM]       = { .type = NLA_U32    },
2043                 [NL80211_STA_INFO_NONPEER_PM]    = { .type = NLA_U32    },
2044         };
2045 
2046         static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
2047                 [NL80211_RATE_INFO_BITRATE]      = { .type = NLA_U16    },
2048                 [NL80211_RATE_INFO_MCS]          = { .type = NLA_U8     },
2049                 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG   },
2050                 [NL80211_RATE_INFO_SHORT_GI]     = { .type = NLA_FLAG   },
2051         };
2052 
2053         /* advance to end of array */
2054         e += arr->count;
2055         memset(e, 0, sizeof(*e));
2056 
2057         if (attr[NL80211_ATTR_MAC])
2058                 memcpy(e->mac, nla_data(attr[NL80211_ATTR_MAC]), 6);
2059 
2060         if (attr[NL80211_ATTR_STA_INFO] &&
2061             !nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
2062                               attr[NL80211_ATTR_STA_INFO], stats_policy))
2063         {
2064                 if (sinfo[NL80211_STA_INFO_SIGNAL])
2065                         e->signal = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
2066 
2067                 if (sinfo[NL80211_STA_INFO_SIGNAL_AVG])
2068                         e->signal_avg = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL_AVG]);
2069 
2070                 if (sinfo[NL80211_STA_INFO_INACTIVE_TIME])
2071                         e->inactive = nla_get_u32(sinfo[NL80211_STA_INFO_INACTIVE_TIME]);
2072 
2073                 if (sinfo[NL80211_STA_INFO_CONNECTED_TIME])
2074                         e->connected_time = nla_get_u32(sinfo[NL80211_STA_INFO_CONNECTED_TIME]);
2075 
2076                 if (sinfo[NL80211_STA_INFO_RX_PACKETS])
2077                         e->rx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_RX_PACKETS]);
2078 
2079                 if (sinfo[NL80211_STA_INFO_TX_PACKETS])
2080                         e->tx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_TX_PACKETS]);
2081 
2082                 if (sinfo[NL80211_STA_INFO_RX_BITRATE] &&
2083                     !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
2084                                       sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy))
2085                         nl80211_parse_rateinfo(rinfo, &e->rx_rate);
2086 
2087                 if (sinfo[NL80211_STA_INFO_TX_BITRATE] &&
2088                     !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
2089                                       sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy))
2090                         nl80211_parse_rateinfo(rinfo, &e->tx_rate);
2091 
2092                 if (sinfo[NL80211_STA_INFO_RX_BYTES])
2093                         e->rx_bytes = nla_get_u32(sinfo[NL80211_STA_INFO_RX_BYTES]);
2094 
2095                 if (sinfo[NL80211_STA_INFO_TX_BYTES])
2096                         e->tx_bytes = nla_get_u32(sinfo[NL80211_STA_INFO_TX_BYTES]);
2097 
2098                 if (sinfo[NL80211_STA_INFO_TX_RETRIES])
2099                         e->tx_retries = nla_get_u32(sinfo[NL80211_STA_INFO_TX_RETRIES]);
2100 
2101                 if (sinfo[NL80211_STA_INFO_TX_FAILED])
2102                         e->tx_failed = nla_get_u32(sinfo[NL80211_STA_INFO_TX_FAILED]);
2103 
2104                 if (sinfo[NL80211_STA_INFO_T_OFFSET])
2105                         e->t_offset = nla_get_u64(sinfo[NL80211_STA_INFO_T_OFFSET]);
2106 
2107                 if (sinfo[NL80211_STA_INFO_RX_DROP_MISC])
2108                         e->rx_drop_misc = nla_get_u64(sinfo[NL80211_STA_INFO_RX_DROP_MISC]);
2109 
2110                 if (sinfo[NL80211_STA_INFO_EXPECTED_THROUGHPUT])
2111                         e->thr = nla_get_u32(sinfo[NL80211_STA_INFO_EXPECTED_THROUGHPUT]);
2112 
2113                 /* mesh */
2114                 if (sinfo[NL80211_STA_INFO_LLID])
2115                         e->llid = nla_get_u16(sinfo[NL80211_STA_INFO_LLID]);
2116 
2117                 if (sinfo[NL80211_STA_INFO_PLID])
2118                         e->plid = nla_get_u16(sinfo[NL80211_STA_INFO_PLID]);
2119 
2120                 if (sinfo[NL80211_STA_INFO_PLINK_STATE])
2121                         plink_state_to_str(e->plink_state,
2122                                 nla_get_u8(sinfo[NL80211_STA_INFO_PLINK_STATE]));
2123 
2124                 if (sinfo[NL80211_STA_INFO_LOCAL_PM])
2125                         power_mode_to_str(e->local_ps, sinfo[NL80211_STA_INFO_LOCAL_PM]);
2126                 if (sinfo[NL80211_STA_INFO_PEER_PM])
2127                         power_mode_to_str(e->peer_ps, sinfo[NL80211_STA_INFO_PEER_PM]);
2128                 if (sinfo[NL80211_STA_INFO_NONPEER_PM])
2129                         power_mode_to_str(e->nonpeer_ps, sinfo[NL80211_STA_INFO_NONPEER_PM]);
2130 
2131                 /* Station flags */
2132                 if (sinfo[NL80211_STA_INFO_STA_FLAGS])
2133                 {
2134                         sta_flags = (struct nl80211_sta_flag_update *)
2135                                 nla_data(sinfo[NL80211_STA_INFO_STA_FLAGS]);
2136 
2137                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_AUTHORIZED) &&
2138                             sta_flags->set & BIT(NL80211_STA_FLAG_AUTHORIZED))
2139                                 e->is_authorized = 1;
2140 
2141                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_AUTHENTICATED) &&
2142                             sta_flags->set & BIT(NL80211_STA_FLAG_AUTHENTICATED))
2143                                 e->is_authenticated = 1;
2144 
2145                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) &&
2146                             sta_flags->set & BIT(NL80211_STA_FLAG_SHORT_PREAMBLE))
2147                                 e->is_preamble_short = 1;
2148 
2149                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_WME) &&
2150                             sta_flags->set & BIT(NL80211_STA_FLAG_WME))
2151                                 e->is_wme = 1;
2152 
2153                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_MFP) &&
2154                             sta_flags->set & BIT(NL80211_STA_FLAG_MFP))
2155                                 e->is_mfp = 1;
2156 
2157                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_TDLS_PEER) &&
2158                             sta_flags->set & BIT(NL80211_STA_FLAG_TDLS_PEER))
2159                                 e->is_tdls = 1;
2160                 }
2161         }
2162 
2163         e->noise = 0; /* filled in by caller */
2164         arr->count++;
2165 
2166         return NL_SKIP;
2167 }
2168 
2169 static int nl80211_get_survey(const char *ifname, char *buf, int *len)
2170 {
2171         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
2172         int rc;
2173 
2174         rc = nl80211_request(ifname, NL80211_CMD_GET_SURVEY,
2175                         NLM_F_DUMP, nl80211_get_survey_cb, &arr);
2176         if (!rc)
2177                 *len = (arr.count * sizeof(struct iwinfo_survey_entry));
2178         else
2179                 *len = 0;
2180 
2181         return 0;
2182 }
2183 
2184 static int nl80211_get_assoclist(const char *ifname, char *buf, int *len)
2185 {
2186         DIR *d;
2187         int i, noise = 0;
2188         struct dirent *de;
2189         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
2190         struct iwinfo_assoclist_entry *e;
2191 
2192         if ((d = opendir("/sys/class/net")) != NULL)
2193         {
2194                 while ((de = readdir(d)) != NULL)
2195                 {
2196                         if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
2197                             (!de->d_name[strlen(ifname)] ||
2198                              !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
2199                         {
2200                                 nl80211_request(de->d_name, NL80211_CMD_GET_STATION,
2201                                                 NLM_F_DUMP, nl80211_get_assoclist_cb, &arr);
2202                         }
2203                 }
2204 
2205                 closedir(d);
2206 
2207                 if (!nl80211_get_noise(ifname, &noise))
2208                         for (i = 0, e = arr.buf; i < arr.count; i++, e++)
2209                                 e->noise = noise;
2210 
2211                 *len = (arr.count * sizeof(struct iwinfo_assoclist_entry));
2212                 return 0;
2213         }
2214 
2215         return -1;
2216 }
2217 
2218 static int nl80211_get_txpwrlist_cb(struct nl_msg *msg, void *arg)
2219 {
2220         int *dbm_max = arg;
2221         int ch_cur, ch_cmp, bands_remain, freqs_remain;
2222 
2223         struct nlattr **attr = nl80211_parse(msg);
2224         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
2225         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
2226         struct nlattr *band, *freq;
2227 
2228         static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
2229                 [NL80211_FREQUENCY_ATTR_FREQ]         = { .type = NLA_U32  },
2230                 [NL80211_FREQUENCY_ATTR_DISABLED]     = { .type = NLA_FLAG },
2231                 [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
2232                 [NL80211_FREQUENCY_ATTR_NO_IBSS]      = { .type = NLA_FLAG },
2233                 [NL80211_FREQUENCY_ATTR_RADAR]        = { .type = NLA_FLAG },
2234                 [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32  },
2235         };
2236 
2237         ch_cur = *dbm_max; /* value int* is initialized with channel by caller */
2238         *dbm_max = -1;
2239 
2240         nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
2241         {
2242                 nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
2243                           nla_len(band), NULL);
2244 
2245                 nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
2246                 {
2247                         nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
2248                                   nla_data(freq), nla_len(freq), freq_policy);
2249 
2250                         ch_cmp = nl80211_freq2channel(nla_get_u32(
2251                                 freqs[NL80211_FREQUENCY_ATTR_FREQ]));
2252 
2253                         if ((!ch_cur || (ch_cmp == ch_cur)) &&
2254                             freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER])
2255                         {
2256                                 *dbm_max = (int)(0.01 * nla_get_u32(
2257                                         freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]));
2258 
2259                                 break;
2260                         }
2261                 }
2262         }
2263 
2264         return NL_SKIP;
2265 }
2266 
2267 static int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len)
2268 {
2269         int err, ch_cur;
2270         int dbm_max = -1, dbm_cur, dbm_cnt;
2271         struct nl80211_msg_conveyor *req;
2272         struct iwinfo_txpwrlist_entry entry;
2273 
2274         if (nl80211_get_channel(ifname, &ch_cur))
2275                 ch_cur = 0;
2276 
2277         /* initialize the value pointer with channel for callback */
2278         dbm_max = ch_cur;
2279 
2280         err = nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
2281                               nl80211_get_txpwrlist_cb, &dbm_max);
2282 
2283         if (!err)
2284         {
2285                 for (dbm_cur = 0, dbm_cnt = 0;
2286                      dbm_cur < dbm_max;
2287                      dbm_cur++, dbm_cnt++)
2288                 {
2289                         entry.dbm = dbm_cur;
2290                         entry.mw  = iwinfo_dbm2mw(dbm_cur);
2291 
2292                         memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
2293                 }
2294 
2295                 entry.dbm = dbm_max;
2296                 entry.mw  = iwinfo_dbm2mw(dbm_max);
2297 
2298                 memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
2299                 dbm_cnt++;
2300 
2301                 *len = dbm_cnt * sizeof(entry);
2302                 return 0;
2303         }
2304 
2305         return -1;
2306 }
2307 
2308 static void nl80211_get_scancrypto(char *spec, struct iwinfo_crypto_entry *c)
2309 {
2310         int wpa_version = 0;
2311         char *p, *q, *proto, *suites;
2312 
2313         c->enabled = 0;
2314 
2315         for (p = strtok_r(spec, "[]", &q); p; p = strtok_r(NULL, "[]", &q)) {
2316                 if (!strcmp(p, "WEP")) {
2317                         c->enabled      = 1;
2318                         c->auth_suites  = IWINFO_KMGMT_NONE;
2319                         c->auth_algs    = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
2320                         c->pair_ciphers = IWINFO_CIPHER_WEP40 | IWINFO_CIPHER_WEP104;
2321                         break;
2322                 }
2323 
2324                 proto = strtok(p, "-");
2325                 suites = strtok(NULL, "]");
2326 
2327                 if (!proto || !suites)
2328                         continue;
2329 
2330                 if (!strcmp(proto, "WPA2") || !strcmp(proto, "RSN"))
2331                         wpa_version = 2;
2332                 else if (!strcmp(proto, "WPA"))
2333                         wpa_version = 1;
2334                 else
2335                         continue;
2336 
2337                 c->enabled = 1;
2338 
2339                 parse_wpa_suites(suites, wpa_version, &c->wpa_version, &c->auth_suites);
2340                 parse_wpa_ciphers(suites, &c->pair_ciphers);
2341         }
2342 }
2343 
2344 
2345 struct nl80211_scanlist {
2346         struct iwinfo_scanlist_entry *e;
2347         int len;
2348 };
2349 
2350 
2351 static void nl80211_get_scanlist_ie(struct nlattr **bss,
2352                                     struct iwinfo_scanlist_entry *e)
2353 {
2354         int ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
2355         unsigned char *ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
2356         static unsigned char ms_oui[3] = { 0x00, 0x50, 0xf2 };
2357         int len;
2358 
2359         while (ielen >= 2 && ielen >= ie[1])
2360         {
2361                 switch (ie[0])
2362                 {
2363                 case 0: /* SSID */
2364                 case 114: /* Mesh ID */
2365                         if (e->ssid[0] == 0) {
2366                                 len = min(ie[1], IWINFO_ESSID_MAX_SIZE);
2367                                 memcpy(e->ssid, ie + 2, len);
2368                                 e->ssid[len] = 0;
2369                         }
2370                         break;
2371 
2372                 case 48: /* RSN */
2373                         iwinfo_parse_rsn(&e->crypto, ie + 2, ie[1],
2374                                          IWINFO_CIPHER_CCMP, IWINFO_KMGMT_8021x);
2375                         break;
2376 
2377                 case 221: /* Vendor */
2378                         if (ie[1] >= 4 && !memcmp(ie + 2, ms_oui, 3) && ie[5] == 1)
2379                                 iwinfo_parse_rsn(&e->crypto, ie + 6, ie[1] - 4,
2380                                                  IWINFO_CIPHER_TKIP, IWINFO_KMGMT_PSK);
2381                         break;
2382                 case 61: /* HT oeration */
2383                         if (ie[1] >= 3) {
2384                                 e->ht_chan_info.primary_chan = ie[2];
2385                                 e->ht_chan_info.secondary_chan_off = ie[3] & 0x3;
2386                                 e->ht_chan_info.chan_width = (ie[4] & 0x4)>>2;
2387                         }
2388                         break;
2389                 case 192: /* VHT operation */
2390                         if (ie[1] >= 3) {
2391                                 e->vht_chan_info.chan_width = ie[2];
2392                                 e->vht_chan_info.center_chan_1 = ie[3];
2393                                 e->vht_chan_info.center_chan_2 = ie[4];
2394                         }
2395                         break;
2396                 }
2397 
2398                 ielen -= ie[1] + 2;
2399                 ie += ie[1] + 2;
2400         }
2401 }
2402 
2403 static int nl80211_get_scanlist_cb(struct nl_msg *msg, void *arg)
2404 {
2405         int8_t rssi;
2406         uint16_t caps;
2407 
2408         struct nl80211_scanlist *sl = arg;
2409         struct nlattr **tb = nl80211_parse(msg);
2410         struct nlattr *bss[NL80211_BSS_MAX + 1];
2411 
2412         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
2413                 [NL80211_BSS_TSF]                  = { .type = NLA_U64 },
2414                 [NL80211_BSS_FREQUENCY]            = { .type = NLA_U32 },
2415                 [NL80211_BSS_BSSID]                = { 0 },
2416                 [NL80211_BSS_BEACON_INTERVAL]      = { .type = NLA_U16 },
2417                 [NL80211_BSS_CAPABILITY]           = { .type = NLA_U16 },
2418                 [NL80211_BSS_INFORMATION_ELEMENTS] = { 0 },
2419                 [NL80211_BSS_SIGNAL_MBM]           = { .type = NLA_U32 },
2420                 [NL80211_BSS_SIGNAL_UNSPEC]        = { .type = NLA_U8  },
2421                 [NL80211_BSS_STATUS]               = { .type = NLA_U32 },
2422                 [NL80211_BSS_SEEN_MS_AGO]          = { .type = NLA_U32 },
2423                 [NL80211_BSS_BEACON_IES]           = { 0 },
2424         };
2425 
2426         if (!tb[NL80211_ATTR_BSS] ||
2427                 nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
2428                                  bss_policy) ||
2429                 !bss[NL80211_BSS_BSSID])
2430         {
2431                 return NL_SKIP;
2432         }
2433 
2434         if (bss[NL80211_BSS_CAPABILITY])
2435                 caps = nla_get_u16(bss[NL80211_BSS_CAPABILITY]);
2436         else
2437                 caps = 0;
2438 
2439         memset(sl->e, 0, sizeof(*sl->e));
2440         memcpy(sl->e->mac, nla_data(bss[NL80211_BSS_BSSID]), 6);
2441 
2442         if (caps & (1<<1))
2443                 sl->e->mode = IWINFO_OPMODE_ADHOC;
2444         else if (caps & (1<<0))
2445                 sl->e->mode = IWINFO_OPMODE_MASTER;
2446         else
2447                 sl->e->mode = IWINFO_OPMODE_MESHPOINT;
2448 
2449         if (caps & (1<<4))
2450                 sl->e->crypto.enabled = 1;
2451 
2452         if (bss[NL80211_BSS_FREQUENCY])
2453                 sl->e->channel = nl80211_freq2channel(nla_get_u32(
2454                         bss[NL80211_BSS_FREQUENCY]));
2455 
2456         if (bss[NL80211_BSS_INFORMATION_ELEMENTS])
2457                 nl80211_get_scanlist_ie(bss, sl->e);
2458 
2459         if (bss[NL80211_BSS_SIGNAL_MBM])
2460         {
2461                 sl->e->signal =
2462                         (uint8_t)((int32_t)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100);
2463 
2464                 rssi = sl->e->signal - 0x100;
2465 
2466                 if (rssi < -110)
2467                         rssi = -110;
2468                 else if (rssi > -40)
2469                         rssi = -40;
2470 
2471                 sl->e->quality = (rssi + 110);
2472                 sl->e->quality_max = 70;
2473         }
2474 
2475         if (sl->e->crypto.enabled && !sl->e->crypto.wpa_version)
2476         {
2477                 sl->e->crypto.auth_algs    = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
2478                 sl->e->crypto.pair_ciphers = IWINFO_CIPHER_WEP40 | IWINFO_CIPHER_WEP104;
2479         }
2480 
2481         sl->e++;
2482         sl->len++;
2483 
2484         return NL_SKIP;
2485 }
2486 
2487 static int nl80211_get_scanlist_nl(const char *ifname, char *buf, int *len)
2488 {
2489         struct nl80211_scanlist sl = { .e = (struct iwinfo_scanlist_entry *)buf };
2490 
2491         if (nl80211_request(ifname, NL80211_CMD_TRIGGER_SCAN, 0, NULL, NULL))
2492                 goto out;
2493 
2494         if (nl80211_wait("nl80211", "scan",
2495                          NL80211_CMD_NEW_SCAN_RESULTS, NL80211_CMD_SCAN_ABORTED))
2496                 goto out;
2497 
2498         if (nl80211_request(ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
2499                             nl80211_get_scanlist_cb, &sl))
2500                 goto out;
2501 
2502         *len = sl.len * sizeof(struct iwinfo_scanlist_entry);
2503         return 0;
2504 
2505 out:
2506         *len = 0;
2507         return -1;
2508 }
2509 
2510 static int wpasupp_ssid_decode(const char *in, char *out, int outlen)
2511 {
2512 #define hex(x) \
2513         (((x) >= 'a') ? ((x) - 'a' + 10) : \
2514                 (((x) >= 'A') ? ((x) - 'A' + 10) : ((x) - '')))
2515 
2516         int len = 0;
2517 
2518         while (*in)
2519         {
2520                 if (len + 1 >= outlen)
2521                         break;
2522 
2523                 switch (*in)
2524                 {
2525                 case '\\':
2526                         in++;
2527                         switch (*in)
2528                         {
2529                         case 'n':
2530                                 out[len++] = '\n'; in++;
2531                                 break;
2532 
2533                         case 'r':
2534                                 out[len++] = '\r'; in++;
2535                                 break;
2536 
2537                         case 't':
2538                                 out[len++] = '\t'; in++;
2539                                 break;
2540 
2541                         case 'e':
2542                                 out[len++] = '\033'; in++;
2543                                 break;
2544 
2545                         case 'x':
2546                                 if (isxdigit(*(in+1)) && isxdigit(*(in+2)))
2547                                         out[len++] = hex(*(in+1)) * 16 + hex(*(in+2));
2548                                 in += 3;
2549                                 break;
2550 
2551                         default:
2552                                 out[len++] = *in++;
2553                                 break;
2554                         }
2555                         break;
2556 
2557                 default:
2558                         out[len++] = *in++;
2559                         break;
2560                 }
2561         }
2562 
2563         if (outlen > len)
2564                 out[len] = '\0';
2565 
2566         return len;
2567 }
2568 
2569 static int nl80211_get_scanlist_wpactl(const char *ifname, char *buf, int *len)
2570 {
2571         int sock, qmax, rssi, tries, count = -1, ready = 0;
2572         char *pos, *line, *bssid, *freq, *signal, *flags, *ssid, reply[4096];
2573         struct sockaddr_un local = { 0 };
2574         struct iwinfo_scanlist_entry *e = (struct iwinfo_scanlist_entry *)buf;
2575 
2576         sock = nl80211_wpactl_connect(ifname, &local);
2577 
2578         if (sock < 0)
2579                 return sock;
2580 
2581         send(sock, "ATTACH", 6, 0);
2582         send(sock, "SCAN", 4, 0);
2583 
2584         /*
2585          * wait for scan results:
2586          *   nl80211_wpactl_recv() will use a timeout of 256ms and we need to scan
2587          *   72 channels at most. We'll also receive two "OK" messages acknowledging
2588          *   the "ATTACH" and "SCAN" commands and the driver might need a bit extra
2589          *   time to process the results, so try 72 + 2 + 1 times.
2590          */
2591         for (tries = 0; tries < 75; tries++)
2592         {
2593                 if (nl80211_wpactl_recv(sock, reply, sizeof(reply)) <= 0)
2594                         continue;
2595 
2596                 /* got an event notification */
2597                 if (reply[0] == '<')
2598                 {
2599                         /* scan results are ready */
2600                         if (strstr(reply, "CTRL-EVENT-SCAN-RESULTS"))
2601                         {
2602                                 /* send "SCAN_RESULTS" command */
2603                                 ready = (send(sock, "SCAN_RESULTS", 12, 0) == 12);
2604                                 break;
2605                         }
2606 
2607                         /* is another unrelated event, retry */
2608                         tries--;
2609                 }
2610 
2611                 /* scanning already in progress, keep awaiting results */
2612                 else if (!strcmp(reply, "FAIL-BUSY\n"))
2613                 {
2614                         tries--;
2615                 }
2616 
2617                 /* another failure, abort */
2618                 else if (!strncmp(reply, "FAIL-", 5))
2619                 {
2620                         break;
2621                 }
2622         }
2623 
2624         /* receive and parse scan results if the wait above didn't time out */
2625         while (ready && nl80211_wpactl_recv(sock, reply, sizeof(reply)) > 0)
2626         {
2627                 /* received an event notification, receive again */
2628                 if (reply[0] == '<')
2629                         continue;
2630 
2631                 nl80211_get_quality_max(ifname, &qmax);
2632 
2633                 for (line = strtok_r(reply, "\n", &pos);
2634                      line != NULL;
2635                      line = strtok_r(NULL, "\n", &pos))
2636                 {
2637                         /* skip header line */
2638                         if (count < 0)
2639                         {
2640                                 count++;
2641                                 continue;
2642                         }
2643 
2644                         bssid  = strtok(line, "\t");
2645                         freq   = strtok(NULL, "\t");
2646                         signal = strtok(NULL, "\t");
2647                         flags  = strtok(NULL, "\t");
2648                         ssid   = strtok(NULL, "\n");
2649 
2650                         if (!bssid || !freq || !signal || !flags)
2651                                 continue;
2652 
2653                         /* BSSID */
2654                         e->mac[0] = strtol(&bssid[0],  NULL, 16);
2655                         e->mac[1] = strtol(&bssid[3],  NULL, 16);
2656                         e->mac[2] = strtol(&bssid[6],  NULL, 16);
2657                         e->mac[3] = strtol(&bssid[9],  NULL, 16);
2658                         e->mac[4] = strtol(&bssid[12], NULL, 16);
2659                         e->mac[5] = strtol(&bssid[15], NULL, 16);
2660 
2661                         /* SSID */
2662                         if (ssid)
2663                                 wpasupp_ssid_decode(ssid, e->ssid, sizeof(e->ssid));
2664                         else
2665                                 e->ssid[0] = 0;
2666 
2667                         /* Mode */
2668                         if (strstr(flags, "[MESH]"))
2669                                 e->mode = IWINFO_OPMODE_MESHPOINT;
2670                         else if (strstr(flags, "[IBSS]"))
2671                                 e->mode = IWINFO_OPMODE_ADHOC;
2672                         else
2673                                 e->mode = IWINFO_OPMODE_MASTER;
2674 
2675                         /* Channel */
2676                         e->channel = nl80211_freq2channel(atoi(freq));
2677 
2678                         /* Signal */
2679                         rssi = atoi(signal);
2680                         e->signal = rssi;
2681 
2682                         /* Quality */
2683                         if (rssi < 0)
2684                         {
2685                                 /* The cfg80211 wext compat layer assumes a signal range
2686                                  * of -110 dBm to -40 dBm, the quality value is derived
2687                                  * by adding 110 to the signal level */
2688                                 if (rssi < -110)
2689                                         rssi = -110;
2690                                 else if (rssi > -40)
2691                                         rssi = -40;
2692 
2693                                 e->quality = (rssi + 110);
2694                         }
2695                         else
2696                         {
2697                                 e->quality = rssi;
2698                         }
2699 
2700                         /* Max. Quality */
2701                         e->quality_max = qmax;
2702 
2703                         /* Crypto */
2704                         nl80211_get_scancrypto(flags, &e->crypto);
2705 
2706                         count++;
2707                         e++;
2708                 }
2709 
2710                 *len = count * sizeof(struct iwinfo_scanlist_entry);
2711                 break;
2712         }
2713 
2714         close(sock);
2715         unlink(local.sun_path);
2716 
2717         return (count >= 0) ? 0 : -1;
2718 }
2719 
2720 static int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
2721 {
2722         char *res;
2723         int rv, mode;
2724 
2725         *len = 0;
2726 
2727         /* Got a radioX pseudo interface, find some interface on it or create one */
2728         if (!strncmp(ifname, "radio", 5))
2729         {
2730                 /* Reuse existing interface */
2731                 if ((res = nl80211_phy2ifname(ifname)) != NULL)
2732                 {
2733                         return nl80211_get_scanlist(res, buf, len);
2734                 }
2735 
2736                 /* Need to spawn a temporary iface for scanning */
2737                 else if ((res = nl80211_ifadd(ifname)) != NULL)
2738                 {
2739                         rv = nl80211_get_scanlist(res, buf, len);
2740                         nl80211_ifdel(res);
2741                         return rv;
2742                 }
2743         }
2744 
2745         /* WPA supplicant */
2746         if (!nl80211_get_scanlist_wpactl(ifname, buf, len))
2747         {
2748                 return 0;
2749         }
2750 
2751         /* station / ad-hoc / monitor scan */
2752         else if (!nl80211_get_mode(ifname, &mode) &&
2753                  (mode == IWINFO_OPMODE_ADHOC ||
2754                   mode == IWINFO_OPMODE_MASTER ||
2755                   mode == IWINFO_OPMODE_CLIENT ||
2756                   mode == IWINFO_OPMODE_MONITOR) &&
2757                  iwinfo_ifup(ifname))
2758         {
2759                 return nl80211_get_scanlist_nl(ifname, buf, len);
2760         }
2761 
2762         /* AP scan */
2763         else
2764         {
2765                 /* Got a temp interface, don't create yet another one */
2766                 if (!strncmp(ifname, "tmp.", 4))
2767                 {
2768                         if (!iwinfo_ifup(ifname))
2769                                 return -1;
2770 
2771                         rv = nl80211_get_scanlist_nl(ifname, buf, len);
2772                         iwinfo_ifdown(ifname);
2773                         return rv;
2774                 }
2775 
2776                 /* Spawn a new scan interface */
2777                 else
2778                 {
2779                         if (!(res = nl80211_ifadd(ifname)))
2780                                 return -1;
2781 
2782                         iwinfo_ifmac(res);
2783 
2784                         /* if we can take the new interface up, the driver supports an
2785                          * additional interface and there's no need to tear down the ap */
2786                         if (iwinfo_ifup(res))
2787                         {
2788                                 rv = nl80211_get_scanlist_nl(res, buf, len);
2789                                 iwinfo_ifdown(res);
2790                         }
2791 
2792                         /* driver cannot create secondary interface, take down ap
2793                          * during scan */
2794                         else if (iwinfo_ifdown(ifname) && iwinfo_ifup(res))
2795                         {
2796                                 rv = nl80211_get_scanlist_nl(res, buf, len);
2797                                 iwinfo_ifdown(res);
2798                                 iwinfo_ifup(ifname);
2799                                 nl80211_hostapd_hup(ifname);
2800                         }
2801 
2802                         nl80211_ifdel(res);
2803                         return rv;
2804                 }
2805         }
2806 
2807         return -1;
2808 }
2809 
2810 static int nl80211_get_freqlist_cb(struct nl_msg *msg, void *arg)
2811 {
2812         int bands_remain, freqs_remain;
2813 
2814         struct nl80211_array_buf *arr = arg;
2815         struct iwinfo_freqlist_entry *e;
2816 
2817         struct nlattr **attr = nl80211_parse(msg);
2818         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
2819         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
2820         struct nlattr *band, *freq;
2821 
2822         e = arr->buf;
2823         e += arr->count;
2824 
2825         if (attr[NL80211_ATTR_WIPHY_BANDS]) {
2826                 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
2827                 {
2828                         nla_parse(bands, NL80211_BAND_ATTR_MAX,
2829                                   nla_data(band), nla_len(band), NULL);
2830 
2831                         if (bands[NL80211_BAND_ATTR_FREQS]) {
2832                                 nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
2833                                 {
2834                                         nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
2835                                                   nla_data(freq), nla_len(freq), NULL);
2836 
2837                                         if (!freqs[NL80211_FREQUENCY_ATTR_FREQ] ||
2838                                             freqs[NL80211_FREQUENCY_ATTR_DISABLED])
2839                                                 continue;
2840 
2841                                         e->mhz = nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]);
2842                                         e->channel = nl80211_freq2channel(e->mhz);
2843 
2844                                         e->restricted = (
2845                                                 freqs[NL80211_FREQUENCY_ATTR_NO_IR] &&
2846                                                 !freqs[NL80211_FREQUENCY_ATTR_RADAR]
2847                                         ) ? 1 : 0;
2848 
2849                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_HT40_MINUS])
2850                                                 e->flags |= IWINFO_FREQ_NO_HT40MINUS;
2851                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_HT40_PLUS])
2852                                                 e->flags |= IWINFO_FREQ_NO_HT40PLUS;
2853                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_80MHZ])
2854                                                 e->flags |= IWINFO_FREQ_NO_80MHZ;
2855                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_160MHZ])
2856                                                 e->flags |= IWINFO_FREQ_NO_160MHZ;
2857                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_20MHZ])
2858                                                 e->flags |= IWINFO_FREQ_NO_20MHZ;
2859                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_10MHZ])
2860                                                 e->flags |= IWINFO_FREQ_NO_10MHZ;
2861 
2862                                         e++;
2863                                         arr->count++;
2864                                 }
2865                         }
2866                 }
2867         }
2868 
2869         return NL_SKIP;
2870 }
2871 
2872 static int nl80211_get_freqlist(const char *ifname, char *buf, int *len)
2873 {
2874         struct nl80211_msg_conveyor *cv;
2875         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
2876         uint32_t features = nl80211_get_protocol_features(ifname);
2877         int flags;
2878 
2879         flags = features & NL80211_PROTOCOL_FEATURE_SPLIT_WIPHY_DUMP ? NLM_F_DUMP : 0;
2880         cv = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, flags);
2881         if (!cv)
2882                 goto out;
2883 
2884         NLA_PUT_FLAG(cv->msg, NL80211_ATTR_SPLIT_WIPHY_DUMP);
2885         if (nl80211_send(cv, nl80211_get_freqlist_cb, &arr))
2886                 goto out;
2887 
2888         *len = arr.count * sizeof(struct iwinfo_freqlist_entry);
2889         return 0;
2890 
2891 nla_put_failure:
2892         nl80211_free(cv);
2893 out:
2894         *len = 0;
2895         return -1;
2896 }
2897 
2898 static int nl80211_get_country_cb(struct nl_msg *msg, void *arg)
2899 {
2900         char *buf = arg;
2901         struct nlattr **attr = nl80211_parse(msg);
2902 
2903         if (attr[NL80211_ATTR_REG_ALPHA2])
2904                 memcpy(buf, nla_data(attr[NL80211_ATTR_REG_ALPHA2]), 2);
2905         else
2906                 buf[0] = 0;
2907 
2908         return NL_SKIP;
2909 }
2910 
2911 static int nl80211_get_country(const char *ifname, char *buf)
2912 {
2913         if (nl80211_request(ifname, NL80211_CMD_GET_REG, 0,
2914                             nl80211_get_country_cb, buf))
2915                 return -1;
2916 
2917         return 0;
2918 }
2919 
2920 static int nl80211_get_countrylist(const char *ifname, char *buf, int *len)
2921 {
2922         int count;
2923         struct iwinfo_country_entry *e = (struct iwinfo_country_entry *)buf;
2924         const struct iwinfo_iso3166_label *l;
2925 
2926         for (l = IWINFO_ISO3166_NAMES, count = 0; l->iso3166; l++, e++, count++)
2927         {
2928                 e->iso3166 = l->iso3166;
2929                 e->ccode[0] = (l->iso3166 / 256);
2930                 e->ccode[1] = (l->iso3166 % 256);
2931                 e->ccode[2] = 0;
2932         }
2933 
2934         *len = (count * sizeof(struct iwinfo_country_entry));
2935         return 0;
2936 }
2937 
2938 
2939 struct nl80211_modes
2940 {
2941         bool ok;
2942         uint32_t hw;
2943         uint32_t ht;
2944 };
2945 
2946 static int nl80211_get_modelist_cb(struct nl_msg *msg, void *arg)
2947 {
2948         struct nl80211_modes *m = arg;
2949         int bands_remain, freqs_remain;
2950         uint16_t caps = 0;
2951         uint32_t vht_caps = 0;
2952         struct nlattr **attr = nl80211_parse(msg);
2953         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
2954         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
2955         struct nlattr *band, *freq;
2956 
2957         if (attr[NL80211_ATTR_WIPHY_BANDS])
2958         {
2959                 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
2960                 {
2961                         nla_parse(bands, NL80211_BAND_ATTR_MAX,
2962                                   nla_data(band), nla_len(band), NULL);
2963 
2964                         if (bands[NL80211_BAND_ATTR_HT_CAPA])
2965                                 caps = nla_get_u16(bands[NL80211_BAND_ATTR_HT_CAPA]);
2966 
2967                         /* Treat any nonzero capability as 11n */
2968                         if (caps > 0)
2969                         {
2970                                 m->hw |= IWINFO_80211_N;
2971                                 m->ht |= IWINFO_HTMODE_HT20;
2972 
2973                                 if (caps & (1 << 1))
2974                                         m->ht |= IWINFO_HTMODE_HT40;
2975                         }
2976 
2977                         if (bands[NL80211_BAND_ATTR_IFTYPE_DATA]) {
2978                                 struct nlattr *tb[NL80211_BAND_IFTYPE_ATTR_MAX + 1];
2979                                 uint16_t phy_cap[6] = { 0 };
2980                                 struct nlattr *nl_iftype;
2981                                 int rem_band;
2982                                 int len;
2983 
2984                                 m->hw |= IWINFO_80211_AX;
2985                                 m->ht |= IWINFO_HTMODE_HE20;
2986 
2987                                 nla_for_each_nested(nl_iftype, bands[NL80211_BAND_ATTR_IFTYPE_DATA], rem_band) {
2988                                         nla_parse(tb, NL80211_BAND_IFTYPE_ATTR_MAX,
2989                                                   nla_data(nl_iftype), nla_len(nl_iftype), NULL);
2990                                         if (tb[NL80211_BAND_IFTYPE_ATTR_HE_CAP_PHY]) {
2991                                                 len = nla_len(tb[NL80211_BAND_IFTYPE_ATTR_HE_CAP_PHY]);
2992 
2993                                                 if (len > sizeof(phy_cap) - 1)
2994                                                         len = sizeof(phy_cap) - 1;
2995                                                 memcpy(&((__u8 *)phy_cap)[1],
2996                                                         nla_data(tb[NL80211_BAND_IFTYPE_ATTR_HE_CAP_PHY]),
2997                                                         len);
2998                                         }
2999 
3000                                         if (phy_cap[0] & BIT(9))
3001                                                 m->ht |= IWINFO_HTMODE_HE40;
3002                                         if (phy_cap[0] & BIT(10))
3003                                                 m->ht |= IWINFO_HTMODE_HE40 | IWINFO_HTMODE_HE80;
3004                                         if (phy_cap[0] & BIT(11))
3005                                                 m->ht |= IWINFO_HTMODE_HE160;
3006                                         if (phy_cap[0] & BIT(12))
3007                                                 m->ht |= IWINFO_HTMODE_HE160 | IWINFO_HTMODE_HE80_80;
3008                                 }
3009                         }
3010 
3011                         nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS],
3012                                             freqs_remain)
3013                         {
3014                                 nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
3015                                           nla_data(freq), nla_len(freq), NULL);
3016 
3017                                 if (!freqs[NL80211_FREQUENCY_ATTR_FREQ])
3018                                         continue;
3019 
3020                                 if (nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]) < 2485)
3021                                 {
3022                                         m->hw |= IWINFO_80211_B;
3023                                         m->hw |= IWINFO_80211_G;
3024                                 }
3025                                 else if (bands[NL80211_BAND_ATTR_VHT_CAPA])
3026                                 {
3027                                         vht_caps = nla_get_u32(bands[NL80211_BAND_ATTR_VHT_CAPA]);
3028 
3029                                         /* Treat any nonzero capability as 11ac */
3030                                         if (vht_caps > 0)
3031                                         {
3032                                                 m->hw |= IWINFO_80211_AC;
3033                                                 m->ht |= IWINFO_HTMODE_VHT20 | IWINFO_HTMODE_VHT40 | IWINFO_HTMODE_VHT80;
3034 
3035                                                 switch ((vht_caps >> 2) & 3)
3036                                                 {
3037                                                 case 2:
3038                                                         m->ht |= IWINFO_HTMODE_VHT80_80;
3039                                                         /* fall through */
3040 
3041                                                 case 1:
3042                                                         m->ht |= IWINFO_HTMODE_VHT160;
3043                                                 }
3044                                         }
3045                                 }
3046                                 else if (nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]) >= 56160)
3047                                 {
3048                                         m->hw |= IWINFO_80211_AD;
3049                                 }
3050                                 else if (!(m->hw & IWINFO_80211_AC))
3051                                 {
3052                                         m->hw |= IWINFO_80211_A;
3053                                 }
3054                         }
3055                 }
3056 
3057                 m->ok = 1;
3058         }
3059 
3060         return NL_SKIP;
3061 }
3062 
3063 static int nl80211_get_hwmodelist(const char *ifname, int *buf)
3064 {
3065         struct nl80211_modes m = { 0 };
3066 
3067         if (nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
3068                             nl80211_get_modelist_cb, &m))
3069                 goto out;
3070 
3071         if (!m.ok)
3072                 goto out;
3073 
3074         *buf = m.hw;
3075         return 0;
3076 
3077 out:
3078         *buf = 0;
3079         return -1;
3080 }
3081 
3082 struct chan_info {
3083         int width;
3084         int mode;
3085 };
3086 
3087 static int nl80211_get_htmode_cb(struct nl_msg *msg, void *arg)
3088 {
3089         struct nlattr **tb = nl80211_parse(msg);
3090         struct nlattr *cur;
3091         struct chan_info *chn = arg;
3092 
3093         if ((cur = tb[NL80211_ATTR_CHANNEL_WIDTH]))
3094                 chn->width = nla_get_u32(cur);
3095 
3096         if ((cur = tb[NL80211_ATTR_BSS_HT_OPMODE]))
3097                 chn->mode = nla_get_u32(cur);
3098 
3099         return NL_SKIP;
3100 }
3101 
3102 static int nl80211_get_htmode(const char *ifname, int *buf)
3103 {
3104         struct chan_info chn = { .width = 0, .mode = 0 };
3105         char *res;
3106         int err;
3107 
3108         res = nl80211_phy2ifname(ifname);
3109         *buf = 0;
3110 
3111         err =  nl80211_request(res ? res : ifname,
3112                                 NL80211_CMD_GET_INTERFACE, 0,
3113                                 nl80211_get_htmode_cb, &chn);
3114         if (err)
3115                 return -1;
3116 
3117         switch (chn.width) {
3118         case NL80211_CHAN_WIDTH_20:
3119                 if (chn.mode == -1)
3120                         *buf = IWINFO_HTMODE_VHT20;
3121                 else
3122                         *buf = IWINFO_HTMODE_HT20;
3123                 break;
3124         case NL80211_CHAN_WIDTH_40:
3125                 if (chn.mode == -1)
3126                         *buf = IWINFO_HTMODE_VHT40;
3127                 else
3128                         *buf = IWINFO_HTMODE_HT40;
3129                 break;
3130         case NL80211_CHAN_WIDTH_80:
3131                 *buf = IWINFO_HTMODE_VHT80;
3132                 break;
3133         case NL80211_CHAN_WIDTH_80P80:
3134                 *buf = IWINFO_HTMODE_VHT80_80;
3135                 break;
3136         case NL80211_CHAN_WIDTH_160:
3137                 *buf = IWINFO_HTMODE_VHT160;
3138                 break;
3139         case NL80211_CHAN_WIDTH_5:
3140         case NL80211_CHAN_WIDTH_10:
3141         case NL80211_CHAN_WIDTH_20_NOHT:
3142                 *buf = IWINFO_HTMODE_NOHT;
3143                 break;
3144         default:
3145                 return -1;
3146         }
3147 
3148         return 0;
3149 }
3150 
3151 static int nl80211_get_htmodelist(const char *ifname, int *buf)
3152 {
3153         struct nl80211_modes m = { 0 };
3154 
3155         if (nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
3156                             nl80211_get_modelist_cb, &m))
3157                 goto out;
3158 
3159         if (!m.ok)
3160                 goto out;
3161 
3162         *buf = m.ht;
3163         return 0;
3164 
3165 out:
3166         *buf = 0;
3167         return -1;
3168 }
3169 
3170 
3171 static int nl80211_get_ifcomb_cb(struct nl_msg *msg, void *arg)
3172 {
3173         struct nlattr **attr = nl80211_parse(msg);
3174         struct nlattr *comb;
3175         int *ret = arg;
3176         int comb_rem, limit_rem, mode_rem;
3177 
3178         *ret = 0;
3179         if (!attr[NL80211_ATTR_INTERFACE_COMBINATIONS])
3180                 return NL_SKIP;
3181 
3182         nla_for_each_nested(comb, attr[NL80211_ATTR_INTERFACE_COMBINATIONS], comb_rem)
3183         {
3184                 static struct nla_policy iface_combination_policy[NUM_NL80211_IFACE_COMB] = {
3185                         [NL80211_IFACE_COMB_LIMITS] = { .type = NLA_NESTED },
3186                         [NL80211_IFACE_COMB_MAXNUM] = { .type = NLA_U32 },
3187                 };
3188                 struct nlattr *tb_comb[NUM_NL80211_IFACE_COMB+1];
3189                 static struct nla_policy iface_limit_policy[NUM_NL80211_IFACE_LIMIT] = {
3190                         [NL80211_IFACE_LIMIT_TYPES] = { .type = NLA_NESTED },
3191                         [NL80211_IFACE_LIMIT_MAX] = { .type = NLA_U32 },
3192                 };
3193                 struct nlattr *tb_limit[NUM_NL80211_IFACE_LIMIT+1];
3194                 struct nlattr *limit;
3195 
3196                 nla_parse_nested(tb_comb, NUM_NL80211_IFACE_COMB, comb, iface_combination_policy);
3197 
3198                 if (!tb_comb[NL80211_IFACE_COMB_LIMITS])
3199                         continue;
3200 
3201                 nla_for_each_nested(limit, tb_comb[NL80211_IFACE_COMB_LIMITS], limit_rem)
3202                 {
3203                         struct nlattr *mode;
3204 
3205                         nla_parse_nested(tb_limit, NUM_NL80211_IFACE_LIMIT, limit, iface_limit_policy);
3206 
3207                         if (!tb_limit[NL80211_IFACE_LIMIT_TYPES] ||
3208                             !tb_limit[NL80211_IFACE_LIMIT_MAX])
3209                                 continue;
3210 
3211                         if (nla_get_u32(tb_limit[NL80211_IFACE_LIMIT_MAX]) < 2)
3212                                 continue;
3213 
3214                         nla_for_each_nested(mode, tb_limit[NL80211_IFACE_LIMIT_TYPES], mode_rem) {
3215                                 if (nla_type(mode) == NL80211_IFTYPE_AP)
3216                                         *ret = 1;
3217                         }
3218                 }
3219         }
3220 
3221         return NL_SKIP;
3222 }
3223 
3224 static int nl80211_get_mbssid_support(const char *ifname, int *buf)
3225 {
3226         if (nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
3227                             nl80211_get_ifcomb_cb, buf))
3228                 return -1;
3229 
3230         return 0;
3231 }
3232 
3233 static int nl80211_hardware_id_from_fdt(struct iwinfo_hardware_id *id, const char *ifname)
3234 {
3235         char *phy, compat[64], path[PATH_MAX];
3236         int i;
3237 
3238         /* Try to determine the phy name from the given interface */
3239         phy = nl80211_ifname2phy(ifname);
3240 
3241         snprintf(path, sizeof(path), "/sys/class/%s/%s/device/of_node/compatible",
3242                  phy ? "ieee80211" : "net", phy ? phy : ifname);
3243 
3244         if (nl80211_readstr(path, compat, sizeof(compat)) <= 0)
3245                 return -1;
3246 
3247         if (!strcmp(compat, "qca,ar9130-wmac")) {
3248                 id->vendor_id = 0x168c;
3249                 id->device_id = 0x0029;
3250                 id->subsystem_vendor_id = 0x168c;
3251                 id->subsystem_device_id = 0x9130;
3252         } else if (!strcmp(compat, "qca,ar9330-wmac")) {
3253                 id->vendor_id = 0x168c;
3254                 id->device_id = 0x0030;
3255                 id->subsystem_vendor_id = 0x168c;
3256                 id->subsystem_device_id = 0x9330;
3257         } else if (!strcmp(compat, "qca,ar9340-wmac")) {
3258                 id->vendor_id = 0x168c;
3259                 id->device_id = 0x0030;
3260                 id->subsystem_vendor_id = 0x168c;
3261                 id->subsystem_device_id = 0x9340;
3262         } else if (!strcmp(compat, "qca,qca9530-wmac")) {
3263                 id->vendor_id = 0x168c;
3264                 id->device_id = 0x0033;
3265                 id->subsystem_vendor_id = 0x168c;
3266                 id->subsystem_device_id = 0x9530;
3267         } else if (!strcmp(compat, "qca,qca9550-wmac")) {
3268                 id->vendor_id = 0x168c;
3269                 id->device_id = 0x0033;
3270                 id->subsystem_vendor_id = 0x168c;
3271                 id->subsystem_device_id = 0x9550;
3272         } else if (!strcmp(compat, "qca,qca9560-wmac")) {
3273                 id->vendor_id = 0x168c;
3274                 id->device_id = 0x0033;
3275                 id->subsystem_vendor_id = 0x168c;
3276                 id->subsystem_device_id = 0x9560;
3277         } else if (!strcmp(compat, "qcom,ipq4019-wifi")) {
3278                 id->vendor_id = 0x168c;
3279                 id->device_id = 0x003c;
3280                 id->subsystem_vendor_id = 0x168c;
3281                 id->subsystem_device_id = 0x4019;
3282         } else if (!strcmp(compat, "mediatek,mt7622-wmac")) {
3283                 id->vendor_id = 0x14c3;
3284                 id->device_id = 0x7622;
3285                 id->subsystem_vendor_id = 0x14c3;
3286                 id->subsystem_device_id = 0x7622;
3287         }
3288         return (id->vendor_id && id->device_id) ? 0 : -1;
3289 }
3290 
3291 
3292 static int nl80211_get_hardware_id(const char *ifname, char *buf)
3293 {
3294         struct iwinfo_hardware_id *id = (struct iwinfo_hardware_id *)buf;
3295         char *phy, num[8], path[PATH_MAX];
3296         int i;
3297 
3298         struct { const char *path; uint16_t *dest; } lookup[] = {
3299                 { "vendor", &id->vendor_id },
3300                 { "device", &id->device_id },
3301                 { "subsystem_vendor", &id->subsystem_vendor_id },
3302                 { "subsystem_device", &id->subsystem_device_id }
3303         };
3304 
3305         memset(id, 0, sizeof(*id));
3306 
3307         /* Try to determine the phy name from the given interface */
3308         phy = nl80211_ifname2phy(ifname);
3309 
3310         for (i = 0; i < ARRAY_SIZE(lookup); i++)
3311         {
3312                 snprintf(path, sizeof(path), "/sys/class/%s/%s/device/%s",
3313                          phy ? "ieee80211" : "net",
3314                          phy ? phy : ifname, lookup[i].path);
3315 
3316                 if (nl80211_readstr(path, num, sizeof(num)) > 0)
3317                         *lookup[i].dest = strtoul(num, NULL, 16);
3318         }
3319 
3320         /* Failed to obtain hardware IDs, try FDT */
3321         if (id->vendor_id == 0 || id->device_id == 0)
3322                 if (!nl80211_hardware_id_from_fdt(id, ifname))
3323                         return 0;
3324 
3325         /* Failed to obtain hardware IDs, search board config */
3326         if (id->vendor_id == 0 || id->device_id == 0)
3327                 return iwinfo_hardware_id_from_mtd(id);
3328 
3329         return 0;
3330 }
3331 
3332 static const struct iwinfo_hardware_entry *
3333 nl80211_get_hardware_entry(const char *ifname)
3334 {
3335         struct iwinfo_hardware_id id;
3336 
3337         if (nl80211_get_hardware_id(ifname, (char *)&id))
3338                 return NULL;
3339 
3340         return iwinfo_hardware(&id);
3341 }
3342 
3343 static int nl80211_get_hardware_name(const char *ifname, char *buf)
3344 {
3345         const struct iwinfo_hardware_entry *hw;
3346 
3347         if (!(hw = nl80211_get_hardware_entry(ifname)))
3348                 sprintf(buf, "Generic MAC80211");
3349         else
3350                 sprintf(buf, "%s %s", hw->vendor_name, hw->device_name);
3351 
3352         return 0;
3353 }
3354 
3355 static int nl80211_get_txpower_offset(const char *ifname, int *buf)
3356 {
3357         const struct iwinfo_hardware_entry *hw;
3358 
3359         if (!(hw = nl80211_get_hardware_entry(ifname)))
3360                 return -1;
3361 
3362         *buf = hw->txpower_offset;
3363         return 0;
3364 }
3365 
3366 static int nl80211_get_frequency_offset(const char *ifname, int *buf)
3367 {
3368         const struct iwinfo_hardware_entry *hw;
3369 
3370         if (!(hw = nl80211_get_hardware_entry(ifname)))
3371                 return -1;
3372 
3373         *buf = hw->frequency_offset;
3374         return 0;
3375 }
3376 
3377 static int nl80211_lookup_phyname(const char *section, char *buf)
3378 {
3379         int idx;
3380 
3381         if ((idx = nl80211_phy_idx_from_uci(section)) < 0)
3382                 return -1;
3383 
3384         sprintf(buf, "phy%d", idx);
3385         return 0;
3386 }
3387 
3388 const struct iwinfo_ops nl80211_ops = {
3389         .name             = "nl80211",
3390         .probe            = nl80211_probe,
3391         .channel          = nl80211_get_channel,
3392         .center_chan1     = nl80211_get_center_chan1,
3393         .center_chan2     = nl80211_get_center_chan2,
3394         .frequency        = nl80211_get_frequency,
3395         .frequency_offset = nl80211_get_frequency_offset,
3396         .txpower          = nl80211_get_txpower,
3397         .txpower_offset   = nl80211_get_txpower_offset,
3398         .bitrate          = nl80211_get_bitrate,
3399         .signal           = nl80211_get_signal,
3400         .noise            = nl80211_get_noise,
3401         .quality          = nl80211_get_quality,
3402         .quality_max      = nl80211_get_quality_max,
3403         .mbssid_support   = nl80211_get_mbssid_support,
3404         .hwmodelist       = nl80211_get_hwmodelist,
3405         .htmodelist       = nl80211_get_htmodelist,
3406         .htmode           = nl80211_get_htmode,
3407         .mode             = nl80211_get_mode,
3408         .ssid             = nl80211_get_ssid,
3409         .bssid            = nl80211_get_bssid,
3410         .country          = nl80211_get_country,
3411         .hardware_id      = nl80211_get_hardware_id,
3412         .hardware_name    = nl80211_get_hardware_name,
3413         .encryption       = nl80211_get_encryption,
3414         .phyname          = nl80211_get_phyname,
3415         .assoclist        = nl80211_get_assoclist,
3416         .txpwrlist        = nl80211_get_txpwrlist,
3417         .scanlist         = nl80211_get_scanlist,
3418         .freqlist         = nl80211_get_freqlist,
3419         .countrylist      = nl80211_get_countrylist,
3420         .survey           = nl80211_get_survey,
3421         .lookup_phy       = nl80211_lookup_phyname,
3422         .close            = nl80211_close
3423 };
3424 

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