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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 const char *nl80211_phy_path_str(const char *phyname)
237 {
238         static char path[PATH_MAX];
239         const char *prefix = "/sys/devices/";
240         int prefix_len = strlen(prefix);
241         int buf_len, offset;
242         struct dirent *e;
243         char buf[128], *link;
244         int phy_id;
245         int seq = 0;
246         DIR *d;
247 
248         if (strncmp(phyname, "phy", 3) != 0)
249                 return NULL;
250 
251         phy_id = atoi(phyname + 3);
252         buf_len = snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/device", phyname);
253         link = realpath(buf, path);
254         if (!link)
255                 return NULL;
256 
257         if (strncmp(link, prefix, prefix_len) != 0)
258                 return NULL;
259 
260         link += prefix_len;
261 
262         prefix = "platform/";
263         prefix_len = strlen(prefix);
264         if (!strncmp(link, prefix, prefix_len) && strstr(link, "/pci"))
265                 link += prefix_len;
266 
267         snprintf(buf + buf_len, sizeof(buf) - buf_len, "/ieee80211");
268         d = opendir(buf);
269         if (!d)
270                 return link;
271 
272         while ((e = readdir(d)) != NULL) {
273                 int cur_id;
274 
275                 if (strncmp(e->d_name, "phy", 3) != 0)
276                         continue;
277 
278                 cur_id = atoi(e->d_name + 3);
279                 if (cur_id >= phy_id)
280                         continue;
281 
282                 seq++;
283         }
284 
285         closedir(d);
286 
287         if (!seq)
288                 return link;
289 
290         offset = link - path + strlen(link);
291         snprintf(path + offset, sizeof(path) - offset, "+%d", seq);
292 
293         return link;
294 }
295 
296 static int nl80211_phy_idx_from_path(const char *path)
297 {
298         char buf[128];
299         struct dirent *e;
300         const char *cur_path;
301         int cur_path_len;
302         int path_len;
303         int idx = -1;
304         DIR *d;
305 
306         if (!path)
307                 return -1;
308 
309         path_len = strlen(path);
310         if (!path_len)
311                 return -1;
312 
313         d = opendir("/sys/class/ieee80211");
314         if (!d)
315                 return -1;
316 
317         while ((e = readdir(d)) != NULL) {
318                 cur_path = nl80211_phy_path_str(e->d_name);
319                 if (!cur_path)
320                         continue;
321 
322                 cur_path_len = strlen(cur_path);
323                 if (cur_path_len < path_len)
324                         continue;
325 
326                 if (strcmp(cur_path + cur_path_len - path_len, path) != 0)
327                         continue;
328 
329                 snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/index", e->d_name);
330                 idx = nl80211_readint(buf);
331 
332                 if (idx >= 0)
333                         break;
334         }
335 
336         closedir(d);
337 
338         return idx;
339 }
340 
341 static int nl80211_phy_idx_from_macaddr(const char *opt)
342 {
343         char buf[128];
344         int i, idx = -1;
345         glob_t gl;
346 
347         if (!opt)
348                 return -1;
349 
350         snprintf(buf, sizeof(buf), "/sys/class/ieee80211/*");   /**/
351         if (glob(buf, 0, NULL, &gl))
352                 return -1;
353 
354         for (i = 0; i < gl.gl_pathc; i++)
355         {
356                 snprintf(buf, sizeof(buf), "%s/macaddress", gl.gl_pathv[i]);
357                 if (nl80211_readstr(buf, buf, sizeof(buf)) <= 0)
358                         continue;
359 
360                 if (fnmatch(opt, buf, FNM_CASEFOLD))
361                         continue;
362 
363                 snprintf(buf, sizeof(buf), "%s/index", gl.gl_pathv[i]);
364                 if ((idx = nl80211_readint(buf)) > -1)
365                         break;
366         }
367 
368         globfree(&gl);
369 
370         return idx;
371 }
372 
373 static int nl80211_phy_idx_from_phy(const char *opt)
374 {
375         char buf[128];
376 
377         if (!opt)
378                 return -1;
379 
380         snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/index", opt);
381         return nl80211_readint(buf);
382 }
383 
384 static int nl80211_phy_idx_from_uci(const char *name)
385 {
386         struct uci_section *s;
387         const char *opt;
388         int idx = -1;
389 
390         s = iwinfo_uci_get_radio(name, "mac80211");
391         if (!s)
392                 goto out;
393 
394         opt = uci_lookup_option_string(uci_ctx, s, "path");
395         idx = nl80211_phy_idx_from_path(opt);
396         if (idx >= 0)
397                 goto out;
398 
399         opt = uci_lookup_option_string(uci_ctx, s, "macaddr");
400         idx = nl80211_phy_idx_from_macaddr(opt);
401         if (idx >= 0)
402                 goto out;
403 
404         opt = uci_lookup_option_string(uci_ctx, s, "phy");
405         idx = nl80211_phy_idx_from_phy(opt);
406 
407 out:
408         iwinfo_uci_free();
409         return idx;
410 }
411 
412 static struct nl80211_msg_conveyor * nl80211_msg(const char *ifname,
413                                                  int cmd, int flags)
414 {
415         int ifidx = -1, phyidx = -1;
416         struct nl80211_msg_conveyor *cv;
417 
418         if (ifname == NULL)
419                 return NULL;
420 
421         if (nl80211_init() < 0)
422                 return NULL;
423 
424         if (!strncmp(ifname, "phy", 3))
425                 phyidx = atoi(&ifname[3]);
426         else if (!strncmp(ifname, "radio", 5))
427                 phyidx = nl80211_phy_idx_from_uci(ifname);
428 
429         if (!strncmp(ifname, "mon.", 4))
430                 ifidx = if_nametoindex(&ifname[4]);
431         else
432                 ifidx = if_nametoindex(ifname);
433 
434         /* Valid ifidx must be greater than 0 */
435         if ((ifidx <= 0) && (phyidx < 0))
436                 return NULL;
437 
438         cv = nl80211_new(nls->nl80211, cmd, flags);
439         if (!cv)
440                 return NULL;
441 
442         if (ifidx > 0)
443                 NLA_PUT_U32(cv->msg, NL80211_ATTR_IFINDEX, ifidx);
444         else if (phyidx > -1)
445                 NLA_PUT_U32(cv->msg, NL80211_ATTR_WIPHY, phyidx);
446 
447         return cv;
448 
449 nla_put_failure:
450         nl80211_free(cv);
451         return NULL;
452 }
453 
454 static int nl80211_send(struct nl80211_msg_conveyor *cv,
455                         int (*cb_func)(struct nl_msg *, void *),
456                         void *cb_arg)
457 {
458         static struct nl80211_msg_conveyor rcv;
459         int err;
460 
461         if (cb_func)
462                 nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, cb_func, cb_arg);
463         else
464                 nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, nl80211_msg_response, &rcv);
465 
466         err = nl_send_auto_complete(nls->nl_sock, cv->msg);
467 
468         if (err < 0)
469                 goto out;
470 
471         err = 1;
472 
473         nl_cb_err(cv->cb,               NL_CB_CUSTOM, nl80211_msg_error,  &err);
474         nl_cb_set(cv->cb, NL_CB_FINISH, NL_CB_CUSTOM, nl80211_msg_finish, &err);
475         nl_cb_set(cv->cb, NL_CB_ACK,    NL_CB_CUSTOM, nl80211_msg_ack,    &err);
476 
477         while (err > 0)
478                 nl_recvmsgs(nls->nl_sock, cv->cb);
479 
480 out:
481         nl80211_free(cv);
482         return err;
483 }
484 
485 static int nl80211_request(const char *ifname, int cmd, int flags,
486                            int (*cb_func)(struct nl_msg *, void *),
487                            void *cb_arg)
488 {
489         struct nl80211_msg_conveyor *cv;
490 
491         cv = nl80211_msg(ifname, cmd, flags);
492 
493         if (!cv)
494                 return -ENOMEM;
495 
496         return nl80211_send(cv, cb_func, cb_arg);
497 }
498 
499 static struct nlattr ** nl80211_parse(struct nl_msg *msg)
500 {
501         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
502         static struct nlattr *attr[NL80211_ATTR_MAX + 1];
503 
504         nla_parse(attr, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
505                   genlmsg_attrlen(gnlh, 0), NULL);
506 
507         return attr;
508 }
509 
510 static int nl80211_get_protocol_features_cb(struct nl_msg *msg, void *arg)
511 {
512         uint32_t *features = arg;
513         struct nlattr **attr = nl80211_parse(msg);
514 
515         if (attr[NL80211_ATTR_PROTOCOL_FEATURES])
516                 *features = nla_get_u32(attr[NL80211_ATTR_PROTOCOL_FEATURES]);
517 
518         return NL_SKIP;
519 }
520 
521 static int nl80211_get_protocol_features(const char *ifname)
522 {
523         struct nl80211_msg_conveyor *req;
524         uint32_t features = 0;
525 
526         req = nl80211_msg(ifname, NL80211_CMD_GET_PROTOCOL_FEATURES, 0);
527         if (req) {
528                 nl80211_send(req, nl80211_get_protocol_features_cb, &features);
529                 nl80211_free(req);
530         }
531 
532         return features;
533 }
534 
535 static int nl80211_subscribe_cb(struct nl_msg *msg, void *arg)
536 {
537         struct nl80211_group_conveyor *cv = arg;
538 
539         struct nlattr **attr = nl80211_parse(msg);
540         struct nlattr *mgrpinfo[CTRL_ATTR_MCAST_GRP_MAX + 1];
541         struct nlattr *mgrp;
542         int mgrpidx;
543 
544         if (!attr[CTRL_ATTR_MCAST_GROUPS])
545                 return NL_SKIP;
546 
547         nla_for_each_nested(mgrp, attr[CTRL_ATTR_MCAST_GROUPS], mgrpidx)
548         {
549                 nla_parse(mgrpinfo, CTRL_ATTR_MCAST_GRP_MAX,
550                           nla_data(mgrp), nla_len(mgrp), NULL);
551 
552                 if (mgrpinfo[CTRL_ATTR_MCAST_GRP_ID] &&
553                     mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME] &&
554                     !strncmp(nla_data(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME]),
555                              cv->name, nla_len(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME])))
556                 {
557                         cv->id = nla_get_u32(mgrpinfo[CTRL_ATTR_MCAST_GRP_ID]);
558                         break;
559                 }
560         }
561 
562         return NL_SKIP;
563 }
564 
565 static int nl80211_subscribe(const char *family, const char *group)
566 {
567         struct nl80211_group_conveyor cv = { .name = group, .id = -ENOENT };
568         struct nl80211_msg_conveyor *req;
569         int err;
570 
571         req = nl80211_ctl(CTRL_CMD_GETFAMILY, 0);
572         if (req)
573         {
574                 NLA_PUT_STRING(req->msg, CTRL_ATTR_FAMILY_NAME, family);
575                 err = nl80211_send(req, nl80211_subscribe_cb, &cv);
576 
577                 if (err)
578                         return err;
579 
580                 return nl_socket_add_membership(nls->nl_sock, cv.id);
581 
582 nla_put_failure:
583                 nl80211_free(req);
584         }
585 
586         return -ENOMEM;
587 }
588 
589 
590 static int nl80211_wait_cb(struct nl_msg *msg, void *arg)
591 {
592         struct nl80211_event_conveyor *cv = arg;
593         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
594 
595         if (cv->wait[gnlh->cmd / 32] & (1 << (gnlh->cmd % 32)))
596                 cv->recv = gnlh->cmd;
597 
598         return NL_SKIP;
599 }
600 
601 static int nl80211_wait_seq_check(struct nl_msg *msg, void *arg)
602 {
603         return NL_OK;
604 }
605 
606 static int __nl80211_wait(const char *family, const char *group, ...)
607 {
608         struct nl80211_event_conveyor cv = { };
609         struct nl_cb *cb;
610         int err = 0;
611         int cmd;
612         va_list ap;
613 
614         if (nl80211_subscribe(family, group))
615                 return -ENOENT;
616 
617         cb = nl_cb_alloc(NL_CB_DEFAULT);
618 
619         if (!cb)
620                 return -ENOMEM;
621 
622         nl_cb_err(cb,                  NL_CB_CUSTOM, nl80211_msg_error,      &err);
623         nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, nl80211_wait_seq_check, NULL);
624         nl_cb_set(cb, NL_CB_VALID,     NL_CB_CUSTOM, nl80211_wait_cb,        &cv );
625 
626         va_start(ap, group);
627 
628         for (cmd = va_arg(ap, int); cmd != 0; cmd = va_arg(ap, int))
629                 cv.wait[cmd / 32] |= (1 << (cmd % 32));
630 
631         va_end(ap);
632 
633         while (!cv.recv && !err)
634                 nl_recvmsgs(nls->nl_sock, cb);
635 
636         nl_cb_put(cb);
637 
638         return err;
639 }
640 
641 #define nl80211_wait(family, group, ...) \
642         __nl80211_wait(family, group, __VA_ARGS__, 0)
643 
644 
645 static int nl80211_freq2channel(int freq)
646 {
647         if (freq == 2484)
648                 return 14;
649         else if (freq < 2484)
650                 return (freq - 2407) / 5;
651         else if (freq >= 4910 && freq <= 4980)
652                 return (freq - 4000) / 5;
653         else if(freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6)
654                 return (freq - 56160) / 2160;
655         else
656                 return (freq - 5000) / 5;
657 }
658 
659 static int nl80211_channel2freq(int channel, const char *band)
660 {
661         if (!band || band[0] != 'a')
662         {
663                 if (channel == 14)
664                         return 2484;
665                 else if (channel < 14)
666                         return (channel * 5) + 2407;
667         }
668         else if ( strcmp(band, "ad") == 0)
669         {
670                 return 56160 + 2160 * channel;
671         }
672         else
673         {
674                 if (channel >= 182 && channel <= 196)
675                         return (channel * 5) + 4000;
676                 else
677                         return (channel * 5) + 5000;
678         }
679 
680         return 0;
681 }
682 
683 static int nl80211_ifname2phy_cb(struct nl_msg *msg, void *arg)
684 {
685         char *buf = arg;
686         struct nlattr **attr = nl80211_parse(msg);
687 
688         if (attr[NL80211_ATTR_WIPHY_NAME])
689                 memcpy(buf, nla_data(attr[NL80211_ATTR_WIPHY_NAME]),
690                        nla_len(attr[NL80211_ATTR_WIPHY_NAME]));
691         else
692                 buf[0] = 0;
693 
694         return NL_SKIP;
695 }
696 
697 static char * nl80211_ifname2phy(const char *ifname)
698 {
699         static char phy[32] = { 0 };
700 
701         memset(phy, 0, sizeof(phy));
702 
703         nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
704                         nl80211_ifname2phy_cb, phy);
705 
706         return phy[0] ? phy : NULL;
707 }
708 
709 static char * nl80211_phy2ifname(const char *ifname)
710 {
711         int ifidx = -1, cifidx = -1, phyidx = -1;
712         char buffer[64];
713         static char nif[IFNAMSIZ] = { 0 };
714 
715         DIR *d;
716         struct dirent *e;
717 
718         /* Only accept phy name of the form phy%d or radio%d */
719         if (!ifname)
720                 return NULL;
721         else if (!strncmp(ifname, "phy", 3))
722                 phyidx = atoi(&ifname[3]);
723         else if (!strncmp(ifname, "radio", 5))
724                 phyidx = nl80211_phy_idx_from_uci(ifname);
725         else
726                 return NULL;
727 
728         memset(nif, 0, sizeof(nif));
729 
730         if (phyidx > -1)
731         {
732                 if ((d = opendir("/sys/class/net")) != NULL)
733                 {
734                         while ((e = readdir(d)) != NULL)
735                         {
736                                 snprintf(buffer, sizeof(buffer),
737                                          "/sys/class/net/%s/phy80211/index", e->d_name);
738 
739                                 if (nl80211_readint(buffer) == phyidx)
740                                 {
741                                         snprintf(buffer, sizeof(buffer),
742                                                  "/sys/class/net/%s/ifindex", e->d_name);
743 
744                                         if ((cifidx = nl80211_readint(buffer)) >= 0 &&
745                                             ((ifidx < 0) || (cifidx < ifidx)))
746                                         {
747                                                 ifidx = cifidx;
748                                                 strncpy(nif, e->d_name, sizeof(nif) - 1);
749                                         }
750                                 }
751                         }
752 
753                         closedir(d);
754                 }
755         }
756 
757         return nif[0] ? nif : NULL;
758 }
759 
760 static int nl80211_get_mode_cb(struct nl_msg *msg, void *arg)
761 {
762         int *mode = arg;
763         struct nlattr **tb = nl80211_parse(msg);
764         const int ifmodes[NL80211_IFTYPE_MAX + 1] = {
765                 IWINFO_OPMODE_UNKNOWN,          /* unspecified */
766                 IWINFO_OPMODE_ADHOC,            /* IBSS */
767                 IWINFO_OPMODE_CLIENT,           /* managed */
768                 IWINFO_OPMODE_MASTER,           /* AP */
769                 IWINFO_OPMODE_AP_VLAN,          /* AP/VLAN */
770                 IWINFO_OPMODE_WDS,                      /* WDS */
771                 IWINFO_OPMODE_MONITOR,          /* monitor */
772                 IWINFO_OPMODE_MESHPOINT,        /* mesh point */
773                 IWINFO_OPMODE_P2P_CLIENT,       /* P2P-client */
774                 IWINFO_OPMODE_P2P_GO,           /* P2P-GO */
775         };
776 
777         if (tb[NL80211_ATTR_IFTYPE])
778                 *mode = ifmodes[nla_get_u32(tb[NL80211_ATTR_IFTYPE])];
779 
780         return NL_SKIP;
781 }
782 
783 
784 static int nl80211_get_mode(const char *ifname, int *buf)
785 {
786         char *res;
787 
788         *buf = IWINFO_OPMODE_UNKNOWN;
789 
790         res = nl80211_phy2ifname(ifname);
791 
792         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
793                         nl80211_get_mode_cb, buf);
794 
795         return (*buf == IWINFO_OPMODE_UNKNOWN) ? -1 : 0;
796 }
797 
798 static int __nl80211_hostapd_query(const char *ifname, ...)
799 {
800         va_list ap, ap_cur;
801         char *phy, *search, *dest, *key, *val, buf[128];
802         int len, mode, found = 0, match = 1;
803         FILE *fp;
804 
805         if (nl80211_get_mode(ifname, &mode))
806                 return 0;
807 
808         if (mode != IWINFO_OPMODE_MASTER && mode != IWINFO_OPMODE_AP_VLAN)
809                 return 0;
810 
811         phy = nl80211_ifname2phy(ifname);
812 
813         if (!phy)
814                 return 0;
815 
816         snprintf(buf, sizeof(buf), "/var/run/hostapd-%s.conf", phy);
817         fp = fopen(buf, "r");
818 
819         if (!fp)
820                 return 0;
821 
822         va_start(ap, ifname);
823 
824         /* clear all destination buffers */
825         va_copy(ap_cur, ap);
826 
827         while ((search = va_arg(ap_cur, char *)) != NULL)
828         {
829                 dest = va_arg(ap_cur, char *);
830                 len  = va_arg(ap_cur, int);
831 
832                 memset(dest, 0, len);
833         }
834 
835         va_end(ap_cur);
836 
837         /* iterate applicable lines and copy found values into dest buffers */
838         while (fgets(buf, sizeof(buf), fp))
839         {
840                 key = strtok(buf, " =\t\n");
841                 val = strtok(NULL, "\n");
842 
843                 if (!key || !val || !*key || *key == '#')
844                         continue;
845 
846                 if (!strcmp(key, "interface") || !strcmp(key, "bss"))
847                         match = !strcmp(ifname, val);
848 
849                 if (!match)
850                         continue;
851 
852                 va_copy(ap_cur, ap);
853 
854                 while ((search = va_arg(ap_cur, char *)) != NULL)
855                 {
856                         dest = va_arg(ap_cur, char *);
857                         len  = va_arg(ap_cur, int);
858 
859                         if (!strcmp(search, key))
860                         {
861                                 strncpy(dest, val, len - 1);
862                                 found++;
863                                 break;
864                         }
865                 }
866 
867                 va_end(ap_cur);
868         }
869 
870         fclose(fp);
871 
872         va_end(ap);
873 
874         return found;
875 }
876 
877 #define nl80211_hostapd_query(ifname, ...) \
878         __nl80211_hostapd_query(ifname, ##__VA_ARGS__, NULL)
879 
880 
881 static inline int nl80211_wpactl_recv(int sock, char *buf, int blen)
882 {
883         fd_set rfds;
884         struct timeval tv = { 0, 256000 };
885 
886         FD_ZERO(&rfds);
887         FD_SET(sock, &rfds);
888 
889         memset(buf, 0, blen);
890 
891         if (select(sock + 1, &rfds, NULL, NULL, &tv) < 0)
892                 return -1;
893 
894         if (!FD_ISSET(sock, &rfds))
895                 return -1;
896 
897         return recv(sock, buf, blen - 1, 0);
898 }
899 
900 static int nl80211_wpactl_connect(const char *ifname, struct sockaddr_un *local)
901 {
902         struct sockaddr_un remote = { 0 };
903         size_t remote_length, local_length;
904 
905         int sock = socket(PF_UNIX, SOCK_DGRAM, 0);
906         if (sock < 0)
907                 return sock;
908 
909         remote.sun_family = AF_UNIX;
910         remote_length = sizeof(remote.sun_family) +
911                 sprintf(remote.sun_path, "/var/run/wpa_supplicant-%s/%s",
912                         ifname, ifname);
913 
914         if (fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC) < 0)
915         {
916                 close(sock);
917                 return -1;
918         }
919 
920         if (connect(sock, (struct sockaddr *)&remote, remote_length))
921         {
922                 remote_length = sizeof(remote.sun_family) +
923                         sprintf(remote.sun_path, "/var/run/wpa_supplicant/%s", ifname);
924 
925                 if (connect(sock, (struct sockaddr *)&remote, remote_length))
926                 {
927                         close(sock);
928                         return -1;
929                 }
930         }
931 
932         local->sun_family = AF_UNIX;
933         local_length = sizeof(local->sun_family) +
934                 sprintf(local->sun_path, "/var/run/iwinfo-%s-%d", ifname, getpid());
935 
936         if (bind(sock, (struct sockaddr *)local, local_length) < 0)
937         {
938                 close(sock);
939                 return -1;
940         }
941 
942         return sock;
943 }
944 
945 static int __nl80211_wpactl_query(const char *ifname, ...)
946 {
947         va_list ap, ap_cur;
948         struct sockaddr_un local = { 0 };
949         int len, mode, found = 0, sock = -1;
950         char *search, *dest, *key, *val, *line, *pos, buf[512];
951 
952         if (nl80211_get_mode(ifname, &mode))
953                 return 0;
954 
955         if (mode != IWINFO_OPMODE_CLIENT &&
956             mode != IWINFO_OPMODE_ADHOC &&
957             mode != IWINFO_OPMODE_MESHPOINT)
958                 return 0;
959 
960         sock = nl80211_wpactl_connect(ifname, &local);
961 
962         if (sock < 0)
963                 return 0;
964 
965         va_start(ap, ifname);
966 
967         /* clear all destination buffers */
968         va_copy(ap_cur, ap);
969 
970         while ((search = va_arg(ap_cur, char *)) != NULL)
971         {
972                 dest = va_arg(ap_cur, char *);
973                 len  = va_arg(ap_cur, int);
974 
975                 memset(dest, 0, len);
976         }
977 
978         va_end(ap_cur);
979 
980         send(sock, "STATUS", 6, 0);
981 
982         while (true)
983         {
984                 if (nl80211_wpactl_recv(sock, buf, sizeof(buf)) <= 0)
985                         break;
986 
987                 if (buf[0] == '<')
988                         continue;
989 
990                 for (line = strtok_r(buf, "\n", &pos);
991                          line != NULL;
992                          line = strtok_r(NULL, "\n", &pos))
993                 {
994                         key = strtok(line, "=");
995                         val = strtok(NULL, "\n");
996 
997                         if (!key || !val)
998                                 continue;
999 
1000                         va_copy(ap_cur, ap);
1001 
1002                         while ((search = va_arg(ap_cur, char *)) != NULL)
1003                         {
1004                                 dest = va_arg(ap_cur, char *);
1005                                 len  = va_arg(ap_cur, int);
1006 
1007                                 if (!strcmp(search, key))
1008                                 {
1009                                         strncpy(dest, val, len - 1);
1010                                         found++;
1011                                         break;
1012                                 }
1013                         }
1014 
1015                         va_end(ap_cur);
1016                 }
1017 
1018                 break;
1019         }
1020 
1021         va_end(ap);
1022 
1023         close(sock);
1024         unlink(local.sun_path);
1025 
1026         return found;
1027 }
1028 
1029 #define nl80211_wpactl_query(ifname, ...) \
1030         __nl80211_wpactl_query(ifname, ##__VA_ARGS__, NULL)
1031 
1032 
1033 static char * nl80211_ifadd(const char *ifname)
1034 {
1035         char path[PATH_MAX];
1036         static char nif[IFNAMSIZ] = { 0 };
1037         struct nl80211_msg_conveyor *req;
1038         FILE *sysfs;
1039 
1040         req = nl80211_msg(ifname, NL80211_CMD_NEW_INTERFACE, 0);
1041         if (req)
1042         {
1043                 snprintf(nif, sizeof(nif), "tmp.%s", ifname);
1044 
1045                 NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, nif);
1046                 NLA_PUT_U32(req->msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_STATION);
1047 
1048                 nl80211_send(req, NULL, NULL);
1049 
1050                 snprintf(path, sizeof(path) - 1,
1051                          "/proc/sys/net/ipv6/conf/%s/disable_ipv6", nif);
1052 
1053                 if ((sysfs = fopen(path, "w")) != NULL)
1054                 {
1055                         fwrite("\n", 1, 2, sysfs);
1056                         fclose(sysfs);
1057                 }
1058 
1059                 return nif;
1060 
1061         nla_put_failure:
1062                 nl80211_free(req);
1063         }
1064 
1065         return NULL;
1066 }
1067 
1068 static void nl80211_ifdel(const char *ifname)
1069 {
1070         struct nl80211_msg_conveyor *req;
1071         int err;
1072 
1073         req = nl80211_msg(ifname, NL80211_CMD_DEL_INTERFACE, 0);
1074         if (req)
1075         {
1076                 NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, ifname);
1077 
1078                 nl80211_send(req, NULL, NULL);
1079                 return;
1080 
1081         nla_put_failure:
1082                 nl80211_free(req);
1083         }
1084 }
1085 
1086 static void nl80211_hostapd_hup(const char *ifname)
1087 {
1088         int fd, pid = 0;
1089         char buf[32];
1090         char *phy = nl80211_ifname2phy(ifname);
1091 
1092         if (phy)
1093         {
1094                 snprintf(buf, sizeof(buf), "/var/run/wifi-%s.pid", phy);
1095                 if ((fd = open(buf, O_RDONLY)) >= 0)
1096                 {
1097                         if (read(fd, buf, sizeof(buf)) > 0)
1098                                 pid = atoi(buf);
1099 
1100                         close(fd);
1101                 }
1102 
1103                 if (pid > 0)
1104                         kill(pid, 1);
1105         }
1106 }
1107 
1108 
1109 static int nl80211_probe(const char *ifname)
1110 {
1111         return !!nl80211_ifname2phy(ifname);
1112 }
1113 
1114 struct nl80211_ssid_bssid {
1115         unsigned char *ssid;
1116         unsigned char bssid[7];
1117 };
1118 
1119 static int nl80211_get_macaddr_cb(struct nl_msg *msg, void *arg)
1120 {
1121         struct nl80211_ssid_bssid *sb = arg;
1122         struct nlattr **tb = nl80211_parse(msg);
1123 
1124         if (tb[NL80211_ATTR_MAC]) {
1125                 sb->bssid[0] = 1;
1126                 memcpy(sb->bssid + 1, nla_data(tb[NL80211_ATTR_MAC]),
1127                        sizeof(sb->bssid) - 1);
1128         }
1129 
1130         return NL_SKIP;
1131 }
1132 
1133 static int nl80211_get_ssid_bssid_cb(struct nl_msg *msg, void *arg)
1134 {
1135         int ielen;
1136         unsigned char *ie;
1137         struct nl80211_ssid_bssid *sb = arg;
1138         struct nlattr **tb = nl80211_parse(msg);
1139         struct nlattr *bss[NL80211_BSS_MAX + 1];
1140 
1141         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
1142                 [NL80211_BSS_INFORMATION_ELEMENTS] = { 0 },
1143                 [NL80211_BSS_STATUS]               = { .type = NLA_U32 },
1144         };
1145 
1146         if (!tb[NL80211_ATTR_BSS] ||
1147             nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
1148                              bss_policy) ||
1149             !bss[NL80211_BSS_BSSID] ||
1150             !bss[NL80211_BSS_STATUS] ||
1151             !bss[NL80211_BSS_INFORMATION_ELEMENTS])
1152         {
1153                 return NL_SKIP;
1154         }
1155 
1156         switch (nla_get_u32(bss[NL80211_BSS_STATUS]))
1157         {
1158         case NL80211_BSS_STATUS_ASSOCIATED:
1159         case NL80211_BSS_STATUS_AUTHENTICATED:
1160         case NL80211_BSS_STATUS_IBSS_JOINED:
1161 
1162                 if (sb->ssid)
1163                 {
1164                         ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
1165                         ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
1166 
1167                         while (ielen >= 2 && ielen >= ie[1])
1168                         {
1169                                 if (ie[0] == 0)
1170                                 {
1171                                         memcpy(sb->ssid, ie + 2, min(ie[1], IWINFO_ESSID_MAX_SIZE));
1172                                         return NL_SKIP;
1173                                 }
1174 
1175                                 ielen -= ie[1] + 2;
1176                                 ie += ie[1] + 2;
1177                         }
1178                 }
1179                 else
1180                 {
1181                         sb->bssid[0] = 1;
1182                         memcpy(sb->bssid + 1, nla_data(bss[NL80211_BSS_BSSID]), 6);
1183                         return NL_SKIP;
1184                 }
1185 
1186         default:
1187                 return NL_SKIP;
1188         }
1189 }
1190 
1191 static int nl80211_get_ssid(const char *ifname, char *buf)
1192 {
1193         char *res;
1194         struct nl80211_ssid_bssid sb = { .ssid = (unsigned char *)buf };
1195 
1196         /* try to find ssid from scan dump results */
1197         res = nl80211_phy2ifname(ifname);
1198         sb.ssid[0] = 0;
1199 
1200         nl80211_request(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1201                         nl80211_get_ssid_bssid_cb, &sb);
1202 
1203         /* failed, try to find from hostapd info */
1204         if (sb.ssid[0] == 0)
1205                 nl80211_hostapd_query(ifname, "ssid", sb.ssid,
1206                                       IWINFO_ESSID_MAX_SIZE + 1);
1207 
1208         /* failed, try to obtain Mesh ID */
1209         if (sb.ssid[0] == 0)
1210                 iwinfo_ubus_query(res ? res : ifname, "mesh_id",
1211                                   sb.ssid, IWINFO_ESSID_MAX_SIZE + 1);
1212 
1213         return (sb.ssid[0] == 0) ? -1 : 0;
1214 }
1215 
1216 static int nl80211_get_bssid(const char *ifname, char *buf)
1217 {
1218         char *res, bssid[sizeof("FF:FF:FF:FF:FF:FF\0")];
1219         struct nl80211_ssid_bssid sb = { };
1220 
1221         res = nl80211_phy2ifname(ifname);
1222 
1223         /* try to obtain mac address via NL80211_CMD_GET_INTERFACE */
1224         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1225                         nl80211_get_macaddr_cb, &sb);
1226 
1227         /* failed, try to find bssid from scan dump results */
1228         if (sb.bssid[0] == 0)
1229                 nl80211_request(res ? res : ifname,
1230                                 NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1231                                 nl80211_get_ssid_bssid_cb, &sb);
1232 
1233         /* failed, try to find mac from hostapd info */
1234         if ((sb.bssid[0] == 0) &&
1235             nl80211_hostapd_query(ifname, "bssid", bssid, sizeof(bssid)))
1236         {
1237                 sb.bssid[0] = 1;
1238                 sb.bssid[1] = strtol(&bssid[0],  NULL, 16);
1239                 sb.bssid[2] = strtol(&bssid[3],  NULL, 16);
1240                 sb.bssid[3] = strtol(&bssid[6],  NULL, 16);
1241                 sb.bssid[4] = strtol(&bssid[9],  NULL, 16);
1242                 sb.bssid[5] = strtol(&bssid[12], NULL, 16);
1243                 sb.bssid[6] = strtol(&bssid[15], NULL, 16);
1244         }
1245 
1246         if (sb.bssid[0])
1247         {
1248                 sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
1249                         sb.bssid[1], sb.bssid[2], sb.bssid[3],
1250                         sb.bssid[4], sb.bssid[5], sb.bssid[6]);
1251 
1252                 return 0;
1253         }
1254 
1255         return -1;
1256 }
1257 
1258 
1259 static int nl80211_get_frequency_scan_cb(struct nl_msg *msg, void *arg)
1260 {
1261         int *freq = arg;
1262         struct nlattr **attr = nl80211_parse(msg);
1263         struct nlattr *binfo[NL80211_BSS_MAX + 1];
1264 
1265         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
1266                 [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
1267                 [NL80211_BSS_STATUS]    = { .type = NLA_U32 },
1268         };
1269 
1270         if (attr[NL80211_ATTR_BSS] &&
1271             !nla_parse_nested(binfo, NL80211_BSS_MAX,
1272                               attr[NL80211_ATTR_BSS], bss_policy))
1273         {
1274                 if (binfo[NL80211_BSS_STATUS] && binfo[NL80211_BSS_FREQUENCY])
1275                         *freq = nla_get_u32(binfo[NL80211_BSS_FREQUENCY]);
1276         }
1277 
1278         return NL_SKIP;
1279 }
1280 
1281 static int nl80211_get_frequency_info_cb(struct nl_msg *msg, void *arg)
1282 {
1283         int *freq = arg;
1284         struct nlattr **tb = nl80211_parse(msg);
1285 
1286         if (tb[NL80211_ATTR_WIPHY_FREQ])
1287                 *freq = nla_get_u32(tb[NL80211_ATTR_WIPHY_FREQ]);
1288 
1289         return NL_SKIP;
1290 }
1291 
1292 static int nl80211_get_frequency(const char *ifname, int *buf)
1293 {
1294         char *res, channel[4], hwmode[3];
1295 
1296         /* try to find frequency from interface info */
1297         res = nl80211_phy2ifname(ifname);
1298         *buf = 0;
1299 
1300         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1301                         nl80211_get_frequency_info_cb, buf);
1302 
1303         /* failed, try to find frequency from hostapd info */
1304         if ((*buf == 0) &&
1305             nl80211_hostapd_query(ifname, "hw_mode", hwmode, sizeof(hwmode),
1306                                           "channel", channel, sizeof(channel)) == 2)
1307         {
1308                 *buf = nl80211_channel2freq(atoi(channel), hwmode);
1309         }
1310 
1311         /* failed, try to find frequency from scan results */
1312         if (*buf == 0)
1313         {
1314                 res = nl80211_phy2ifname(ifname);
1315 
1316                 nl80211_request(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1317                                 nl80211_get_frequency_scan_cb, buf);
1318         }
1319 
1320         return (*buf == 0) ? -1 : 0;
1321 }
1322 
1323 static int nl80211_get_center_freq1_cb(struct nl_msg *msg, void *arg)
1324 {
1325         int *freq = arg;
1326         struct nlattr **tb = nl80211_parse(msg);
1327 
1328         if (tb[NL80211_ATTR_CENTER_FREQ1])
1329                 *freq = nla_get_u32(tb[NL80211_ATTR_CENTER_FREQ1]);
1330 
1331         return NL_SKIP;
1332 }
1333 
1334 static int nl80211_get_center_freq1(const char *ifname, int *buf)
1335 {
1336         char *res;
1337 
1338         /* try to find frequency from interface info */
1339         res = nl80211_phy2ifname(ifname);
1340         *buf = 0;
1341 
1342         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1343                         nl80211_get_center_freq1_cb, buf);
1344 
1345         return (*buf == 0) ? -1 : 0;
1346 }
1347 
1348 static int nl80211_get_center_freq2_cb(struct nl_msg *msg, void *arg)
1349 {
1350         int *freq = arg;
1351         struct nlattr **tb = nl80211_parse(msg);
1352 
1353         if (tb[NL80211_ATTR_CENTER_FREQ2])
1354                 *freq = nla_get_u32(tb[NL80211_ATTR_CENTER_FREQ2]);
1355 
1356         return NL_SKIP;
1357 }
1358 
1359 static int nl80211_get_center_freq2(const char *ifname, int *buf)
1360 {
1361         char *res;
1362 
1363         /* try to find frequency from interface info */
1364         res = nl80211_phy2ifname(ifname);
1365         *buf = 0;
1366 
1367         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1368                         nl80211_get_center_freq2_cb, buf);
1369 
1370         return (*buf == 0) ? -1 : 0;
1371 }
1372 
1373 static int nl80211_get_channel(const char *ifname, int *buf)
1374 {
1375         if (!nl80211_get_frequency(ifname, buf))
1376         {
1377                 *buf = nl80211_freq2channel(*buf);
1378                 return 0;
1379         }
1380 
1381         return -1;
1382 }
1383 
1384 static int nl80211_get_center_chan1(const char *ifname, int *buf)
1385 {
1386         if (!nl80211_get_center_freq1(ifname, buf))
1387         {
1388                 *buf = nl80211_freq2channel(*buf);
1389                 return 0;
1390         }
1391 
1392         return -1;
1393 }
1394 
1395 static int nl80211_get_center_chan2(const char *ifname, int *buf)
1396 {
1397         if (!nl80211_get_center_freq2(ifname, buf))
1398         {
1399                 *buf = nl80211_freq2channel(*buf);
1400                 return 0;
1401         }
1402 
1403         return -1;
1404 }
1405 
1406 static int nl80211_get_txpower_cb(struct nl_msg *msg, void *arg)
1407 {
1408         int *buf = arg;
1409         struct nlattr **tb = nl80211_parse(msg);
1410 
1411         if (tb[NL80211_ATTR_WIPHY_TX_POWER_LEVEL])
1412                 *buf = iwinfo_mbm2dbm(nla_get_u32(tb[NL80211_ATTR_WIPHY_TX_POWER_LEVEL]));
1413 
1414         return NL_SKIP;
1415 }
1416 
1417 static int nl80211_get_txpower(const char *ifname, int *buf)
1418 {
1419         char *res;
1420 
1421         res = nl80211_phy2ifname(ifname);
1422         *buf = 0;
1423 
1424         if (nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1425                             nl80211_get_txpower_cb, buf))
1426                 return -1;
1427 
1428         return 0;
1429 }
1430 
1431 
1432 static int nl80211_fill_signal_cb(struct nl_msg *msg, void *arg)
1433 {
1434         int8_t dbm;
1435         int16_t mbit;
1436         struct nl80211_rssi_rate *rr = arg;
1437         struct nlattr **attr = nl80211_parse(msg);
1438         struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
1439         struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
1440 
1441         static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
1442                 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32    },
1443                 [NL80211_STA_INFO_RX_BYTES]      = { .type = NLA_U32    },
1444                 [NL80211_STA_INFO_TX_BYTES]      = { .type = NLA_U32    },
1445                 [NL80211_STA_INFO_RX_PACKETS]    = { .type = NLA_U32    },
1446                 [NL80211_STA_INFO_TX_PACKETS]    = { .type = NLA_U32    },
1447                 [NL80211_STA_INFO_SIGNAL]        = { .type = NLA_U8     },
1448                 [NL80211_STA_INFO_TX_BITRATE]    = { .type = NLA_NESTED },
1449                 [NL80211_STA_INFO_LLID]          = { .type = NLA_U16    },
1450                 [NL80211_STA_INFO_PLID]          = { .type = NLA_U16    },
1451                 [NL80211_STA_INFO_PLINK_STATE]   = { .type = NLA_U8     },
1452         };
1453 
1454         static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
1455                 [NL80211_RATE_INFO_BITRATE]      = { .type = NLA_U16  },
1456                 [NL80211_RATE_INFO_MCS]          = { .type = NLA_U8   },
1457                 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG },
1458                 [NL80211_RATE_INFO_SHORT_GI]     = { .type = NLA_FLAG },
1459         };
1460 
1461         if (attr[NL80211_ATTR_STA_INFO])
1462         {
1463                 if (!nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
1464                                       attr[NL80211_ATTR_STA_INFO], stats_policy))
1465                 {
1466                         if (sinfo[NL80211_STA_INFO_SIGNAL])
1467                         {
1468                                 dbm = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
1469                                 rr->rssi = (rr->rssi * rr->rssi_samples + dbm) / (rr->rssi_samples + 1);
1470                                 rr->rssi_samples++;
1471                         }
1472 
1473                         if (sinfo[NL80211_STA_INFO_TX_BITRATE])
1474                         {
1475                                 if (!nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
1476                                                       sinfo[NL80211_STA_INFO_TX_BITRATE],
1477                                                       rate_policy))
1478                                 {
1479                                         if (rinfo[NL80211_RATE_INFO_BITRATE])
1480                                         {
1481                                                 mbit = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]);
1482                                                 rr->rate = (rr->rate * rr->rate_samples + mbit) / (rr->rate_samples + 1);
1483                                                 rr->rate_samples++;
1484                                         }
1485                                 }
1486                         }
1487                 }
1488         }
1489 
1490         return NL_SKIP;
1491 }
1492 
1493 static void nl80211_fill_signal(const char *ifname, struct nl80211_rssi_rate *r)
1494 {
1495         DIR *d;
1496         struct dirent *de;
1497 
1498         memset(r, 0, sizeof(*r));
1499 
1500         if ((d = opendir("/sys/class/net")) != NULL)
1501         {
1502                 while ((de = readdir(d)) != NULL)
1503                 {
1504                         if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
1505                             (!de->d_name[strlen(ifname)] ||
1506                              !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
1507                         {
1508                                 nl80211_request(de->d_name, NL80211_CMD_GET_STATION,
1509                                                 NLM_F_DUMP, nl80211_fill_signal_cb, r);
1510                         }
1511                 }
1512 
1513                 closedir(d);
1514         }
1515 }
1516 
1517 static int nl80211_get_bitrate(const char *ifname, int *buf)
1518 {
1519         struct nl80211_rssi_rate rr;
1520 
1521         nl80211_fill_signal(ifname, &rr);
1522 
1523         if (rr.rate_samples)
1524         {
1525                 *buf = (rr.rate * 100);
1526                 return 0;
1527         }
1528 
1529         return -1;
1530 }
1531 
1532 static int nl80211_get_signal(const char *ifname, int *buf)
1533 {
1534         struct nl80211_rssi_rate rr;
1535 
1536         nl80211_fill_signal(ifname, &rr);
1537 
1538         if (rr.rssi_samples)
1539         {
1540                 *buf = rr.rssi;
1541                 return 0;
1542         }
1543 
1544         return -1;
1545 }
1546 
1547 static int nl80211_get_noise_cb(struct nl_msg *msg, void *arg)
1548 {
1549         int8_t *noise = arg;
1550         struct nlattr **tb = nl80211_parse(msg);
1551         struct nlattr *si[NL80211_SURVEY_INFO_MAX + 1];
1552 
1553         static struct nla_policy sp[NL80211_SURVEY_INFO_MAX + 1] = {
1554                 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
1555                 [NL80211_SURVEY_INFO_NOISE]     = { .type = NLA_U8  },
1556         };
1557 
1558         if (!tb[NL80211_ATTR_SURVEY_INFO])
1559                 return NL_SKIP;
1560 
1561         if (nla_parse_nested(si, NL80211_SURVEY_INFO_MAX,
1562                              tb[NL80211_ATTR_SURVEY_INFO], sp))
1563                 return NL_SKIP;
1564 
1565         if (!si[NL80211_SURVEY_INFO_NOISE])
1566                 return NL_SKIP;
1567 
1568         if (!*noise || si[NL80211_SURVEY_INFO_IN_USE])
1569                 *noise = (int8_t)nla_get_u8(si[NL80211_SURVEY_INFO_NOISE]);
1570 
1571         return NL_SKIP;
1572 }
1573 
1574 
1575 static int nl80211_get_noise(const char *ifname, int *buf)
1576 {
1577         int8_t noise = 0;
1578 
1579         if (nl80211_request(ifname, NL80211_CMD_GET_SURVEY, NLM_F_DUMP,
1580                             nl80211_get_noise_cb, &noise))
1581                 goto out;
1582 
1583         *buf = noise;
1584         return 0;
1585 
1586 out:
1587         *buf = 0;
1588         return -1;
1589 }
1590 
1591 static int nl80211_get_quality(const char *ifname, int *buf)
1592 {
1593         int signal;
1594 
1595         if (!nl80211_get_signal(ifname, &signal))
1596         {
1597                 /* A positive signal level is usually just a quality
1598                  * value, pass through as-is */
1599                 if (signal >= 0)
1600                 {
1601                         *buf = signal;
1602                 }
1603 
1604                 /* The cfg80211 wext compat layer assumes a signal range
1605                  * of -110 dBm to -40 dBm, the quality value is derived
1606                  * by adding 110 to the signal level */
1607                 else
1608                 {
1609                         if (signal < -110)
1610                                 signal = -110;
1611                         else if (signal > -40)
1612                                 signal = -40;
1613 
1614                         *buf = (signal + 110);
1615                 }
1616 
1617                 return 0;
1618         }
1619 
1620         return -1;
1621 }
1622 
1623 static int nl80211_get_quality_max(const char *ifname, int *buf)
1624 {
1625         /* The cfg80211 wext compat layer assumes a maximum
1626          * quality of 70 */
1627         *buf = 70;
1628 
1629         return 0;
1630 }
1631 
1632 static int nl80211_check_wepkey(const char *key)
1633 {
1634         if (key && *key)
1635         {
1636                 switch (strlen(key))
1637                 {
1638                 case 5:
1639                 case 10:
1640                         return IWINFO_CIPHER_WEP40;
1641 
1642                 case 13:
1643                 case 26:
1644                         return IWINFO_CIPHER_WEP104;
1645                 }
1646         }
1647 
1648         return 0;
1649 }
1650 
1651 static struct {
1652         const char *match;
1653         int version;
1654         int suite;
1655 } wpa_key_mgmt_strings[] = {
1656         { "IEEE 802.1X/EAP", 0, IWINFO_KMGMT_8021x },
1657         { "EAP-SUITE-B-192", 4, IWINFO_KMGMT_8021x },
1658         { "EAP-SUITE-B",     4, IWINFO_KMGMT_8021x },
1659         { "EAP-SHA256",      0, IWINFO_KMGMT_8021x },
1660         { "PSK-SHA256",      0, IWINFO_KMGMT_PSK },
1661         { "NONE",            0, IWINFO_KMGMT_NONE },
1662         { "None",            0, IWINFO_KMGMT_NONE },
1663         { "PSK",             0, IWINFO_KMGMT_PSK },
1664         { "EAP",             0, IWINFO_KMGMT_8021x },
1665         { "SAE",             4, IWINFO_KMGMT_SAE },
1666         { "OWE",             4, IWINFO_KMGMT_OWE }
1667 };
1668 
1669 static void parse_wpa_suites(const char *str, int defversion,
1670                              uint8_t *versions, uint8_t *suites)
1671 {
1672         size_t l;
1673         int i, version;
1674         const char *p, *q, *m, *sep = " \t\n,-+/";
1675 
1676         for (p = str; *p; )
1677         {
1678                 q = p;
1679 
1680                 for (i = 0; i < ARRAY_SIZE(wpa_key_mgmt_strings); i++)
1681                 {
1682                         m = wpa_key_mgmt_strings[i].match;
1683                         l = strlen(m);
1684 
1685                         if (!strncmp(q, m, l) && (!q[l] || strchr(sep, q[l])))
1686                         {
1687                                 if (wpa_key_mgmt_strings[i].version != 0)
1688                                         version = wpa_key_mgmt_strings[i].version;
1689                                 else
1690                                         version = defversion;
1691 
1692                                 *versions |= version;
1693                                 *suites |= wpa_key_mgmt_strings[i].suite;
1694 
1695                                 q += l;
1696                                 break;
1697                         }
1698                 }
1699 
1700                 if (q == p)
1701                         q += strcspn(q, sep);
1702 
1703                 p = q + strspn(q, sep);
1704         }
1705 }
1706 
1707 static struct {
1708         const char *match;
1709         int cipher;
1710 } wpa_cipher_strings[] = {
1711         { "WEP-104", IWINFO_CIPHER_WEP104 },
1712         { "WEP-40",  IWINFO_CIPHER_WEP40 },
1713         { "NONE",    IWINFO_CIPHER_NONE },
1714         { "TKIP",    IWINFO_CIPHER_TKIP },
1715         { "CCMP",    IWINFO_CIPHER_CCMP },
1716         { "GCMP",    IWINFO_CIPHER_GCMP }
1717 };
1718 
1719 static void parse_wpa_ciphers(const char *str, uint16_t *ciphers)
1720 {
1721         int i;
1722         size_t l;
1723         const char *m, *p, *q, *sep = " \t\n,-+/";
1724 
1725         for (p = str; *p; )
1726         {
1727                 q = p;
1728 
1729                 for (i = 0; i < ARRAY_SIZE(wpa_cipher_strings); i++)
1730                 {
1731                         m = wpa_cipher_strings[i].match;
1732                         l = strlen(m);
1733 
1734                         if (!strncmp(q, m, l) && (!q[l] || strchr(sep, q[l])))
1735                         {
1736                                 *ciphers |= wpa_cipher_strings[i].cipher;
1737 
1738                                 q += l;
1739                                 break;
1740                         }
1741                 }
1742 
1743                 if (q == p)
1744                         q += strcspn(q, sep);
1745 
1746                 p = q + strspn(q, sep);
1747         }
1748 }
1749 
1750 static int nl80211_get_encryption(const char *ifname, char *buf)
1751 {
1752         char *p;
1753         int opmode;
1754         uint8_t wpa_version = 0;
1755         char wpa[2], wpa_key_mgmt[64], wpa_pairwise[16], wpa_groupwise[16];
1756         char auth_algs[2], wep_key0[27], wep_key1[27], wep_key2[27], wep_key3[27];
1757         char mode[16];
1758 
1759         struct iwinfo_crypto_entry *c = (struct iwinfo_crypto_entry *)buf;
1760 
1761         /* WPA supplicant */
1762         if (nl80211_wpactl_query(ifname,
1763                         "pairwise_cipher", wpa_pairwise,  sizeof(wpa_pairwise),
1764                         "group_cipher",    wpa_groupwise, sizeof(wpa_groupwise),
1765                         "key_mgmt",        wpa_key_mgmt,  sizeof(wpa_key_mgmt),
1766                         "mode",            mode,          sizeof(mode)))
1767         {
1768                 /* WEP or Open */
1769                 if (!strcmp(wpa_key_mgmt, "NONE"))
1770                 {
1771                         parse_wpa_ciphers(wpa_pairwise, &c->pair_ciphers);
1772                         parse_wpa_ciphers(wpa_groupwise, &c->group_ciphers);
1773 
1774                         if (c->pair_ciphers != 0 && c->pair_ciphers != IWINFO_CIPHER_NONE) {
1775                                 c->enabled     = 1;
1776                                 c->auth_suites = IWINFO_KMGMT_NONE;
1777                                 c->auth_algs   = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
1778                         }
1779                         else {
1780                                 c->pair_ciphers = 0;
1781                                 c->group_ciphers = 0;
1782                         }
1783                 }
1784 
1785                 /* MESH with SAE */
1786                 else if (!strcmp(mode, "mesh") && !strcmp(wpa_key_mgmt, "UNKNOWN"))
1787                 {
1788                         c->enabled = 1;
1789                         c->wpa_version = 4;
1790                         c->auth_suites = IWINFO_KMGMT_SAE;
1791                         c->pair_ciphers = IWINFO_CIPHER_CCMP;
1792                         c->group_ciphers = IWINFO_CIPHER_CCMP;
1793                 }
1794 
1795                 /* WPA */
1796                 else
1797                 {
1798                         parse_wpa_ciphers(wpa_pairwise, &c->pair_ciphers);
1799                         parse_wpa_ciphers(wpa_groupwise, &c->group_ciphers);
1800 
1801                         p = wpa_key_mgmt;
1802 
1803                         if (!strncmp(p, "WPA2-", 5) || !strncmp(p, "WPA2/", 5))
1804                         {
1805                                 p += 5;
1806                                 wpa_version = 2;
1807                         }
1808                         else if (!strncmp(p, "WPA-", 4))
1809                         {
1810                                 p += 4;
1811                                 wpa_version = 1;
1812                         }
1813 
1814                         parse_wpa_suites(p, wpa_version, &c->wpa_version, &c->auth_suites);
1815 
1816                         c->enabled = !!(c->wpa_version && c->auth_suites);
1817                 }
1818 
1819                 return 0;
1820         }
1821 
1822         /* Hostapd */
1823         else if (nl80211_hostapd_query(ifname,
1824                                 "wpa",          wpa,          sizeof(wpa),
1825                                 "wpa_key_mgmt", wpa_key_mgmt, sizeof(wpa_key_mgmt),
1826                                 "wpa_pairwise", wpa_pairwise, sizeof(wpa_pairwise),
1827                                 "auth_algs",    auth_algs,    sizeof(auth_algs),
1828                                 "wep_key0",     wep_key0,     sizeof(wep_key0),
1829                                 "wep_key1",     wep_key1,     sizeof(wep_key1),
1830                                 "wep_key2",     wep_key2,     sizeof(wep_key2),
1831                                 "wep_key3",     wep_key3,     sizeof(wep_key3)))
1832         {
1833                 c->wpa_version = 0;
1834 
1835                 if (wpa_key_mgmt[0])
1836                 {
1837                         for (p = strtok(wpa_key_mgmt, " \t"); p != NULL; p = strtok(NULL, " \t"))
1838                         {
1839                                 if (!strncmp(p, "WPA-", 4))
1840                                         p += 4;
1841 
1842                                 parse_wpa_suites(p, atoi(wpa), &c->wpa_version, &c->auth_suites);
1843                         }
1844 
1845                         c->enabled = c->wpa_version ? 1 : 0;
1846                 }
1847 
1848                 if (wpa_pairwise[0])
1849                         parse_wpa_ciphers(wpa_pairwise, &c->pair_ciphers);
1850 
1851                 if (auth_algs[0])
1852                 {
1853                         switch (atoi(auth_algs))
1854                         {
1855                         case 1:
1856                                 c->auth_algs |= IWINFO_AUTH_OPEN;
1857                                 break;
1858 
1859                         case 2:
1860                                 c->auth_algs |= IWINFO_AUTH_SHARED;
1861                                 break;
1862 
1863                         case 3:
1864                                 c->auth_algs |= IWINFO_AUTH_OPEN;
1865                                 c->auth_algs |= IWINFO_AUTH_SHARED;
1866                                 break;
1867                         }
1868 
1869                         c->pair_ciphers |= nl80211_check_wepkey(wep_key0);
1870                         c->pair_ciphers |= nl80211_check_wepkey(wep_key1);
1871                         c->pair_ciphers |= nl80211_check_wepkey(wep_key2);
1872                         c->pair_ciphers |= nl80211_check_wepkey(wep_key3);
1873 
1874                         c->enabled = (c->auth_algs && c->pair_ciphers) ? 1 : 0;
1875                 }
1876 
1877                 c->group_ciphers = c->pair_ciphers;
1878 
1879                 return 0;
1880         }
1881 
1882         /* Ad-Hoc or Mesh interfaces without wpa_supplicant are open */
1883         else if (!nl80211_get_mode(ifname, &opmode) &&
1884                  (opmode == IWINFO_OPMODE_ADHOC ||
1885                   opmode == IWINFO_OPMODE_MESHPOINT))
1886         {
1887                 c->enabled = 0;
1888 
1889                 return 0;
1890         }
1891 
1892 
1893         return -1;
1894 }
1895 
1896 static int nl80211_get_phyname(const char *ifname, char *buf)
1897 {
1898         const char *name;
1899 
1900         name = nl80211_ifname2phy(ifname);
1901 
1902         if (name)
1903         {
1904                 strcpy(buf, name);
1905                 return 0;
1906         }
1907         else if ((name = nl80211_phy2ifname(ifname)) != NULL)
1908         {
1909                 name = nl80211_ifname2phy(name);
1910 
1911                 if (name)
1912                 {
1913                         strcpy(buf, ifname);
1914                         return 0;
1915                 }
1916         }
1917 
1918         return -1;
1919 }
1920 
1921 
1922 static void nl80211_parse_rateinfo(struct nlattr **ri,
1923                                    struct iwinfo_rate_entry *re)
1924 {
1925         if (ri[NL80211_RATE_INFO_BITRATE32])
1926                 re->rate = nla_get_u32(ri[NL80211_RATE_INFO_BITRATE32]) * 100;
1927         else if (ri[NL80211_RATE_INFO_BITRATE])
1928                 re->rate = nla_get_u16(ri[NL80211_RATE_INFO_BITRATE]) * 100;
1929 
1930         if (ri[NL80211_RATE_INFO_HE_MCS])
1931         {
1932                 re->is_he = 1;
1933                 re->mcs = nla_get_u8(ri[NL80211_RATE_INFO_HE_MCS]);
1934 
1935                 if (ri[NL80211_RATE_INFO_HE_NSS])
1936                         re->nss = nla_get_u8(ri[NL80211_RATE_INFO_HE_NSS]);
1937                 if (ri[NL80211_RATE_INFO_HE_GI])
1938                         re->he_gi = nla_get_u8(ri[NL80211_RATE_INFO_HE_GI]);
1939                 if (ri[NL80211_RATE_INFO_HE_DCM])
1940                         re->he_dcm = nla_get_u8(ri[NL80211_RATE_INFO_HE_DCM]);
1941         }
1942         else if (ri[NL80211_RATE_INFO_VHT_MCS])
1943         {
1944                 re->is_vht = 1;
1945                 re->mcs = nla_get_u8(ri[NL80211_RATE_INFO_VHT_MCS]);
1946 
1947                 if (ri[NL80211_RATE_INFO_VHT_NSS])
1948                         re->nss = nla_get_u8(ri[NL80211_RATE_INFO_VHT_NSS]);
1949         }
1950         else if (ri[NL80211_RATE_INFO_MCS])
1951         {
1952                 re->is_ht = 1;
1953                 re->mcs = nla_get_u8(ri[NL80211_RATE_INFO_MCS]);
1954         }
1955 
1956         if (ri[NL80211_RATE_INFO_5_MHZ_WIDTH])
1957                 re->mhz = 5;
1958         else if (ri[NL80211_RATE_INFO_10_MHZ_WIDTH])
1959                 re->mhz = 10;
1960         else if (ri[NL80211_RATE_INFO_40_MHZ_WIDTH])
1961                 re->mhz = 40;
1962         else if (ri[NL80211_RATE_INFO_80_MHZ_WIDTH])
1963                 re->mhz = 80;
1964         else if (ri[NL80211_RATE_INFO_80P80_MHZ_WIDTH] ||
1965                  ri[NL80211_RATE_INFO_160_MHZ_WIDTH])
1966                 re->mhz = 160;
1967         else
1968                 re->mhz = 20;
1969 
1970         if (ri[NL80211_RATE_INFO_SHORT_GI])
1971                 re->is_short_gi = 1;
1972 
1973         re->is_40mhz = (re->mhz == 40);
1974 }
1975 
1976 static int nl80211_get_survey_cb(struct nl_msg *msg, void *arg)
1977 {
1978         struct nl80211_array_buf *arr = arg;
1979         struct iwinfo_survey_entry *e = arr->buf;
1980         struct nlattr **attr = nl80211_parse(msg);
1981         struct nlattr *sinfo[NL80211_SURVEY_INFO_MAX + 1];
1982         int rc;
1983 
1984         static struct nla_policy survey_policy[NL80211_SURVEY_INFO_MAX + 1] = {
1985                 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
1986                 [NL80211_SURVEY_INFO_NOISE]  = { .type = NLA_U8     },
1987                 [NL80211_SURVEY_INFO_TIME] = { .type = NLA_U64   },
1988                 [NL80211_SURVEY_INFO_TIME_BUSY] = { .type = NLA_U64   },
1989                 [NL80211_SURVEY_INFO_TIME_EXT_BUSY] = { .type = NLA_U64   },
1990                 [NL80211_SURVEY_INFO_TIME_RX] = { .type = NLA_U64   },
1991                 [NL80211_SURVEY_INFO_TIME_TX] = { .type = NLA_U64   },
1992         };
1993 
1994         rc = nla_parse_nested(sinfo, NL80211_SURVEY_INFO_MAX,
1995                                 attr[NL80211_ATTR_SURVEY_INFO],
1996                                 survey_policy);
1997         if (rc)
1998                 return NL_SKIP;
1999 
2000         /* advance to end of array */
2001         e += arr->count;
2002         memset(e, 0, sizeof(*e));
2003 
2004         if (sinfo[NL80211_SURVEY_INFO_FREQUENCY])
2005                 e->mhz = nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]);
2006 
2007         if (sinfo[NL80211_SURVEY_INFO_NOISE])
2008                 e->noise = nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]);
2009 
2010         if (sinfo[NL80211_SURVEY_INFO_TIME])
2011                 e->active_time = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME]);
2012 
2013         if (sinfo[NL80211_SURVEY_INFO_TIME_BUSY])
2014                 e->busy_time = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_BUSY]);
2015 
2016         if (sinfo[NL80211_SURVEY_INFO_TIME_EXT_BUSY])
2017                 e->busy_time_ext = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_EXT_BUSY]);
2018 
2019         if (sinfo[NL80211_SURVEY_INFO_TIME_RX])
2020                 e->rxtime = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_RX]);
2021 
2022         if (sinfo[NL80211_SURVEY_INFO_TIME_TX])
2023                 e->txtime = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_TX]);
2024 
2025         arr->count++;
2026         return NL_SKIP;
2027 }
2028 
2029 
2030 static void plink_state_to_str(char *dst, unsigned state)
2031 {
2032         switch (state) {
2033         case NL80211_PLINK_LISTEN:
2034                 strcpy(dst, "LISTEN");
2035                 break;
2036         case NL80211_PLINK_OPN_SNT:
2037                 strcpy(dst, "OPN_SNT");
2038                 break;
2039         case NL80211_PLINK_OPN_RCVD:
2040                 strcpy(dst, "OPN_RCVD");
2041                 break;
2042         case NL80211_PLINK_CNF_RCVD:
2043                 strcpy(dst, "CNF_RCVD");
2044                 break;
2045         case NL80211_PLINK_ESTAB:
2046                 strcpy(dst, "ESTAB");
2047                 break;
2048         case NL80211_PLINK_HOLDING:
2049                 strcpy(dst, "HOLDING");
2050                 break;
2051         case NL80211_PLINK_BLOCKED:
2052                 strcpy(dst, "BLOCKED");
2053                 break;
2054         default:
2055                 strcpy(dst, "UNKNOWN");
2056                 break;
2057         }
2058 }
2059 
2060 static void power_mode_to_str(char *dst, struct nlattr *a)
2061 {
2062         enum nl80211_mesh_power_mode pm = nla_get_u32(a);
2063 
2064         switch (pm) {
2065         case NL80211_MESH_POWER_ACTIVE:
2066                 strcpy(dst, "ACTIVE");
2067                 break;
2068         case NL80211_MESH_POWER_LIGHT_SLEEP:
2069                 strcpy(dst, "LIGHT SLEEP");
2070                 break;
2071         case NL80211_MESH_POWER_DEEP_SLEEP:
2072                 strcpy(dst, "DEEP SLEEP");
2073                 break;
2074         default:
2075                 strcpy(dst, "UNKNOWN");
2076                 break;
2077         }
2078 }
2079 
2080 static int nl80211_get_assoclist_cb(struct nl_msg *msg, void *arg)
2081 {
2082         struct nl80211_array_buf *arr = arg;
2083         struct iwinfo_assoclist_entry *e = arr->buf;
2084         struct nlattr **attr = nl80211_parse(msg);
2085         struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
2086         struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
2087         struct nl80211_sta_flag_update *sta_flags;
2088 
2089         static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
2090                 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32    },
2091                 [NL80211_STA_INFO_RX_PACKETS]    = { .type = NLA_U32    },
2092                 [NL80211_STA_INFO_TX_PACKETS]    = { .type = NLA_U32    },
2093                 [NL80211_STA_INFO_RX_BITRATE]    = { .type = NLA_NESTED },
2094                 [NL80211_STA_INFO_TX_BITRATE]    = { .type = NLA_NESTED },
2095                 [NL80211_STA_INFO_SIGNAL]        = { .type = NLA_U8     },
2096                 [NL80211_STA_INFO_SIGNAL_AVG]    = { .type = NLA_U8     },
2097                 [NL80211_STA_INFO_RX_BYTES]      = { .type = NLA_U32    },
2098                 [NL80211_STA_INFO_TX_BYTES]      = { .type = NLA_U32    },
2099                 [NL80211_STA_INFO_TX_RETRIES]    = { .type = NLA_U32    },
2100                 [NL80211_STA_INFO_TX_FAILED]     = { .type = NLA_U32    },
2101                 [NL80211_STA_INFO_CONNECTED_TIME]= { .type = NLA_U32    },
2102                 [NL80211_STA_INFO_RX_DROP_MISC]  = { .type = NLA_U64    },
2103                 [NL80211_STA_INFO_T_OFFSET]      = { .type = NLA_U64    },
2104                 [NL80211_STA_INFO_STA_FLAGS] =
2105                         { .minlen = sizeof(struct nl80211_sta_flag_update) },
2106                 [NL80211_STA_INFO_EXPECTED_THROUGHPUT]   = { .type = NLA_U32    },
2107                 /* mesh */
2108                 [NL80211_STA_INFO_LLID]          = { .type = NLA_U16    },
2109                 [NL80211_STA_INFO_PLID]          = { .type = NLA_U16    },
2110                 [NL80211_STA_INFO_PLINK_STATE]   = { .type = NLA_U8     },
2111                 [NL80211_STA_INFO_LOCAL_PM]      = { .type = NLA_U32    },
2112                 [NL80211_STA_INFO_PEER_PM]       = { .type = NLA_U32    },
2113                 [NL80211_STA_INFO_NONPEER_PM]    = { .type = NLA_U32    },
2114         };
2115 
2116         static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
2117                 [NL80211_RATE_INFO_BITRATE]      = { .type = NLA_U16    },
2118                 [NL80211_RATE_INFO_MCS]          = { .type = NLA_U8     },
2119                 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG   },
2120                 [NL80211_RATE_INFO_SHORT_GI]     = { .type = NLA_FLAG   },
2121         };
2122 
2123         /* advance to end of array */
2124         e += arr->count;
2125         memset(e, 0, sizeof(*e));
2126 
2127         if (attr[NL80211_ATTR_MAC])
2128                 memcpy(e->mac, nla_data(attr[NL80211_ATTR_MAC]), 6);
2129 
2130         if (attr[NL80211_ATTR_STA_INFO] &&
2131             !nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
2132                               attr[NL80211_ATTR_STA_INFO], stats_policy))
2133         {
2134                 if (sinfo[NL80211_STA_INFO_SIGNAL])
2135                         e->signal = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
2136 
2137                 if (sinfo[NL80211_STA_INFO_SIGNAL_AVG])
2138                         e->signal_avg = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL_AVG]);
2139 
2140                 if (sinfo[NL80211_STA_INFO_INACTIVE_TIME])
2141                         e->inactive = nla_get_u32(sinfo[NL80211_STA_INFO_INACTIVE_TIME]);
2142 
2143                 if (sinfo[NL80211_STA_INFO_CONNECTED_TIME])
2144                         e->connected_time = nla_get_u32(sinfo[NL80211_STA_INFO_CONNECTED_TIME]);
2145 
2146                 if (sinfo[NL80211_STA_INFO_RX_PACKETS])
2147                         e->rx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_RX_PACKETS]);
2148 
2149                 if (sinfo[NL80211_STA_INFO_TX_PACKETS])
2150                         e->tx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_TX_PACKETS]);
2151 
2152                 if (sinfo[NL80211_STA_INFO_RX_BITRATE] &&
2153                     !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
2154                                       sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy))
2155                         nl80211_parse_rateinfo(rinfo, &e->rx_rate);
2156 
2157                 if (sinfo[NL80211_STA_INFO_TX_BITRATE] &&
2158                     !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
2159                                       sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy))
2160                         nl80211_parse_rateinfo(rinfo, &e->tx_rate);
2161 
2162                 if (sinfo[NL80211_STA_INFO_RX_BYTES])
2163                         e->rx_bytes = nla_get_u32(sinfo[NL80211_STA_INFO_RX_BYTES]);
2164 
2165                 if (sinfo[NL80211_STA_INFO_TX_BYTES])
2166                         e->tx_bytes = nla_get_u32(sinfo[NL80211_STA_INFO_TX_BYTES]);
2167 
2168                 if (sinfo[NL80211_STA_INFO_TX_RETRIES])
2169                         e->tx_retries = nla_get_u32(sinfo[NL80211_STA_INFO_TX_RETRIES]);
2170 
2171                 if (sinfo[NL80211_STA_INFO_TX_FAILED])
2172                         e->tx_failed = nla_get_u32(sinfo[NL80211_STA_INFO_TX_FAILED]);
2173 
2174                 if (sinfo[NL80211_STA_INFO_T_OFFSET])
2175                         e->t_offset = nla_get_u64(sinfo[NL80211_STA_INFO_T_OFFSET]);
2176 
2177                 if (sinfo[NL80211_STA_INFO_RX_DROP_MISC])
2178                         e->rx_drop_misc = nla_get_u64(sinfo[NL80211_STA_INFO_RX_DROP_MISC]);
2179 
2180                 if (sinfo[NL80211_STA_INFO_EXPECTED_THROUGHPUT])
2181                         e->thr = nla_get_u32(sinfo[NL80211_STA_INFO_EXPECTED_THROUGHPUT]);
2182 
2183                 /* mesh */
2184                 if (sinfo[NL80211_STA_INFO_LLID])
2185                         e->llid = nla_get_u16(sinfo[NL80211_STA_INFO_LLID]);
2186 
2187                 if (sinfo[NL80211_STA_INFO_PLID])
2188                         e->plid = nla_get_u16(sinfo[NL80211_STA_INFO_PLID]);
2189 
2190                 if (sinfo[NL80211_STA_INFO_PLINK_STATE])
2191                         plink_state_to_str(e->plink_state,
2192                                 nla_get_u8(sinfo[NL80211_STA_INFO_PLINK_STATE]));
2193 
2194                 if (sinfo[NL80211_STA_INFO_LOCAL_PM])
2195                         power_mode_to_str(e->local_ps, sinfo[NL80211_STA_INFO_LOCAL_PM]);
2196                 if (sinfo[NL80211_STA_INFO_PEER_PM])
2197                         power_mode_to_str(e->peer_ps, sinfo[NL80211_STA_INFO_PEER_PM]);
2198                 if (sinfo[NL80211_STA_INFO_NONPEER_PM])
2199                         power_mode_to_str(e->nonpeer_ps, sinfo[NL80211_STA_INFO_NONPEER_PM]);
2200 
2201                 /* Station flags */
2202                 if (sinfo[NL80211_STA_INFO_STA_FLAGS])
2203                 {
2204                         sta_flags = (struct nl80211_sta_flag_update *)
2205                                 nla_data(sinfo[NL80211_STA_INFO_STA_FLAGS]);
2206 
2207                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_AUTHORIZED) &&
2208                             sta_flags->set & BIT(NL80211_STA_FLAG_AUTHORIZED))
2209                                 e->is_authorized = 1;
2210 
2211                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_AUTHENTICATED) &&
2212                             sta_flags->set & BIT(NL80211_STA_FLAG_AUTHENTICATED))
2213                                 e->is_authenticated = 1;
2214 
2215                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) &&
2216                             sta_flags->set & BIT(NL80211_STA_FLAG_SHORT_PREAMBLE))
2217                                 e->is_preamble_short = 1;
2218 
2219                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_WME) &&
2220                             sta_flags->set & BIT(NL80211_STA_FLAG_WME))
2221                                 e->is_wme = 1;
2222 
2223                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_MFP) &&
2224                             sta_flags->set & BIT(NL80211_STA_FLAG_MFP))
2225                                 e->is_mfp = 1;
2226 
2227                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_TDLS_PEER) &&
2228                             sta_flags->set & BIT(NL80211_STA_FLAG_TDLS_PEER))
2229                                 e->is_tdls = 1;
2230                 }
2231         }
2232 
2233         e->noise = 0; /* filled in by caller */
2234         arr->count++;
2235 
2236         return NL_SKIP;
2237 }
2238 
2239 static int nl80211_get_survey(const char *ifname, char *buf, int *len)
2240 {
2241         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
2242         int rc;
2243 
2244         rc = nl80211_request(ifname, NL80211_CMD_GET_SURVEY,
2245                         NLM_F_DUMP, nl80211_get_survey_cb, &arr);
2246         if (!rc)
2247                 *len = (arr.count * sizeof(struct iwinfo_survey_entry));
2248         else
2249                 *len = 0;
2250 
2251         return 0;
2252 }
2253 
2254 static int nl80211_get_assoclist(const char *ifname, char *buf, int *len)
2255 {
2256         DIR *d;
2257         int i, noise = 0;
2258         struct dirent *de;
2259         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
2260         struct iwinfo_assoclist_entry *e;
2261 
2262         if ((d = opendir("/sys/class/net")) != NULL)
2263         {
2264                 while ((de = readdir(d)) != NULL)
2265                 {
2266                         if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
2267                             (!de->d_name[strlen(ifname)] ||
2268                              !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
2269                         {
2270                                 nl80211_request(de->d_name, NL80211_CMD_GET_STATION,
2271                                                 NLM_F_DUMP, nl80211_get_assoclist_cb, &arr);
2272                         }
2273                 }
2274 
2275                 closedir(d);
2276 
2277                 if (!nl80211_get_noise(ifname, &noise))
2278                         for (i = 0, e = arr.buf; i < arr.count; i++, e++)
2279                                 e->noise = noise;
2280 
2281                 *len = (arr.count * sizeof(struct iwinfo_assoclist_entry));
2282                 return 0;
2283         }
2284 
2285         return -1;
2286 }
2287 
2288 static int nl80211_get_txpwrlist_cb(struct nl_msg *msg, void *arg)
2289 {
2290         int *dbm_max = arg;
2291         int ch_cur, ch_cmp, bands_remain, freqs_remain;
2292 
2293         struct nlattr **attr = nl80211_parse(msg);
2294         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
2295         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
2296         struct nlattr *band, *freq;
2297 
2298         static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
2299                 [NL80211_FREQUENCY_ATTR_FREQ]         = { .type = NLA_U32  },
2300                 [NL80211_FREQUENCY_ATTR_DISABLED]     = { .type = NLA_FLAG },
2301                 [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
2302                 [NL80211_FREQUENCY_ATTR_NO_IBSS]      = { .type = NLA_FLAG },
2303                 [NL80211_FREQUENCY_ATTR_RADAR]        = { .type = NLA_FLAG },
2304                 [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32  },
2305         };
2306 
2307         ch_cur = *dbm_max; /* value int* is initialized with channel by caller */
2308         *dbm_max = -1;
2309 
2310         nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
2311         {
2312                 nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
2313                           nla_len(band), NULL);
2314 
2315                 nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
2316                 {
2317                         nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
2318                                   nla_data(freq), nla_len(freq), freq_policy);
2319 
2320                         ch_cmp = nl80211_freq2channel(nla_get_u32(
2321                                 freqs[NL80211_FREQUENCY_ATTR_FREQ]));
2322 
2323                         if ((!ch_cur || (ch_cmp == ch_cur)) &&
2324                             freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER])
2325                         {
2326                                 *dbm_max = (int)(0.01 * nla_get_u32(
2327                                         freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]));
2328 
2329                                 break;
2330                         }
2331                 }
2332         }
2333 
2334         return NL_SKIP;
2335 }
2336 
2337 static int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len)
2338 {
2339         int err, ch_cur;
2340         int dbm_max = -1, dbm_cur, dbm_cnt;
2341         struct nl80211_msg_conveyor *req;
2342         struct iwinfo_txpwrlist_entry entry;
2343 
2344         if (nl80211_get_channel(ifname, &ch_cur))
2345                 ch_cur = 0;
2346 
2347         /* initialize the value pointer with channel for callback */
2348         dbm_max = ch_cur;
2349 
2350         err = nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
2351                               nl80211_get_txpwrlist_cb, &dbm_max);
2352 
2353         if (!err)
2354         {
2355                 for (dbm_cur = 0, dbm_cnt = 0;
2356                      dbm_cur < dbm_max;
2357                      dbm_cur++, dbm_cnt++)
2358                 {
2359                         entry.dbm = dbm_cur;
2360                         entry.mw  = iwinfo_dbm2mw(dbm_cur);
2361 
2362                         memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
2363                 }
2364 
2365                 entry.dbm = dbm_max;
2366                 entry.mw  = iwinfo_dbm2mw(dbm_max);
2367 
2368                 memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
2369                 dbm_cnt++;
2370 
2371                 *len = dbm_cnt * sizeof(entry);
2372                 return 0;
2373         }
2374 
2375         return -1;
2376 }
2377 
2378 static void nl80211_get_scancrypto(char *spec, struct iwinfo_crypto_entry *c)
2379 {
2380         int wpa_version = 0;
2381         char *p, *q, *proto, *suites;
2382 
2383         c->enabled = 0;
2384 
2385         for (p = strtok_r(spec, "[]", &q); p; p = strtok_r(NULL, "[]", &q)) {
2386                 if (!strcmp(p, "WEP")) {
2387                         c->enabled      = 1;
2388                         c->auth_suites  = IWINFO_KMGMT_NONE;
2389                         c->auth_algs    = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
2390                         c->pair_ciphers = IWINFO_CIPHER_WEP40 | IWINFO_CIPHER_WEP104;
2391                         break;
2392                 }
2393 
2394                 proto = strtok(p, "-");
2395                 suites = strtok(NULL, "]");
2396 
2397                 if (!proto || !suites)
2398                         continue;
2399 
2400                 if (!strcmp(proto, "WPA2") || !strcmp(proto, "RSN"))
2401                         wpa_version = 2;
2402                 else if (!strcmp(proto, "WPA"))
2403                         wpa_version = 1;
2404                 else
2405                         continue;
2406 
2407                 c->enabled = 1;
2408 
2409                 parse_wpa_suites(suites, wpa_version, &c->wpa_version, &c->auth_suites);
2410                 parse_wpa_ciphers(suites, &c->pair_ciphers);
2411         }
2412 }
2413 
2414 
2415 struct nl80211_scanlist {
2416         struct iwinfo_scanlist_entry *e;
2417         int len;
2418 };
2419 
2420 
2421 static void nl80211_get_scanlist_ie(struct nlattr **bss,
2422                                     struct iwinfo_scanlist_entry *e)
2423 {
2424         int ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
2425         unsigned char *ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
2426         static unsigned char ms_oui[3] = { 0x00, 0x50, 0xf2 };
2427         int len;
2428 
2429         while (ielen >= 2 && ielen >= ie[1])
2430         {
2431                 switch (ie[0])
2432                 {
2433                 case 0: /* SSID */
2434                 case 114: /* Mesh ID */
2435                         if (e->ssid[0] == 0) {
2436                                 len = min(ie[1], IWINFO_ESSID_MAX_SIZE);
2437                                 memcpy(e->ssid, ie + 2, len);
2438                                 e->ssid[len] = 0;
2439                         }
2440                         break;
2441 
2442                 case 48: /* RSN */
2443                         iwinfo_parse_rsn(&e->crypto, ie + 2, ie[1],
2444                                          IWINFO_CIPHER_CCMP, IWINFO_KMGMT_8021x);
2445                         break;
2446 
2447                 case 221: /* Vendor */
2448                         if (ie[1] >= 4 && !memcmp(ie + 2, ms_oui, 3) && ie[5] == 1)
2449                                 iwinfo_parse_rsn(&e->crypto, ie + 6, ie[1] - 4,
2450                                                  IWINFO_CIPHER_TKIP, IWINFO_KMGMT_PSK);
2451                         break;
2452                 case 61: /* HT oeration */
2453                         if (ie[1] >= 3) {
2454                                 e->ht_chan_info.primary_chan = ie[2];
2455                                 e->ht_chan_info.secondary_chan_off = ie[3] & 0x3;
2456                                 e->ht_chan_info.chan_width = (ie[4] & 0x4)>>2;
2457                         }
2458                         break;
2459                 case 192: /* VHT operation */
2460                         if (ie[1] >= 3) {
2461                                 e->vht_chan_info.chan_width = ie[2];
2462                                 e->vht_chan_info.center_chan_1 = ie[3];
2463                                 e->vht_chan_info.center_chan_2 = ie[4];
2464                         }
2465                         break;
2466                 }
2467 
2468                 ielen -= ie[1] + 2;
2469                 ie += ie[1] + 2;
2470         }
2471 }
2472 
2473 static int nl80211_get_scanlist_cb(struct nl_msg *msg, void *arg)
2474 {
2475         int8_t rssi;
2476         uint16_t caps;
2477 
2478         struct nl80211_scanlist *sl = arg;
2479         struct nlattr **tb = nl80211_parse(msg);
2480         struct nlattr *bss[NL80211_BSS_MAX + 1];
2481 
2482         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
2483                 [NL80211_BSS_TSF]                  = { .type = NLA_U64 },
2484                 [NL80211_BSS_FREQUENCY]            = { .type = NLA_U32 },
2485                 [NL80211_BSS_BSSID]                = { 0 },
2486                 [NL80211_BSS_BEACON_INTERVAL]      = { .type = NLA_U16 },
2487                 [NL80211_BSS_CAPABILITY]           = { .type = NLA_U16 },
2488                 [NL80211_BSS_INFORMATION_ELEMENTS] = { 0 },
2489                 [NL80211_BSS_SIGNAL_MBM]           = { .type = NLA_U32 },
2490                 [NL80211_BSS_SIGNAL_UNSPEC]        = { .type = NLA_U8  },
2491                 [NL80211_BSS_STATUS]               = { .type = NLA_U32 },
2492                 [NL80211_BSS_SEEN_MS_AGO]          = { .type = NLA_U32 },
2493                 [NL80211_BSS_BEACON_IES]           = { 0 },
2494         };
2495 
2496         if (!tb[NL80211_ATTR_BSS] ||
2497                 nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
2498                                  bss_policy) ||
2499                 !bss[NL80211_BSS_BSSID])
2500         {
2501                 return NL_SKIP;
2502         }
2503 
2504         if (bss[NL80211_BSS_CAPABILITY])
2505                 caps = nla_get_u16(bss[NL80211_BSS_CAPABILITY]);
2506         else
2507                 caps = 0;
2508 
2509         memset(sl->e, 0, sizeof(*sl->e));
2510         memcpy(sl->e->mac, nla_data(bss[NL80211_BSS_BSSID]), 6);
2511 
2512         if (caps & (1<<1))
2513                 sl->e->mode = IWINFO_OPMODE_ADHOC;
2514         else if (caps & (1<<0))
2515                 sl->e->mode = IWINFO_OPMODE_MASTER;
2516         else
2517                 sl->e->mode = IWINFO_OPMODE_MESHPOINT;
2518 
2519         if (caps & (1<<4))
2520                 sl->e->crypto.enabled = 1;
2521 
2522         if (bss[NL80211_BSS_FREQUENCY])
2523                 sl->e->channel = nl80211_freq2channel(nla_get_u32(
2524                         bss[NL80211_BSS_FREQUENCY]));
2525 
2526         if (bss[NL80211_BSS_INFORMATION_ELEMENTS])
2527                 nl80211_get_scanlist_ie(bss, sl->e);
2528 
2529         if (bss[NL80211_BSS_SIGNAL_MBM])
2530         {
2531                 sl->e->signal =
2532                         (uint8_t)((int32_t)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100);
2533 
2534                 rssi = sl->e->signal - 0x100;
2535 
2536                 if (rssi < -110)
2537                         rssi = -110;
2538                 else if (rssi > -40)
2539                         rssi = -40;
2540 
2541                 sl->e->quality = (rssi + 110);
2542                 sl->e->quality_max = 70;
2543         }
2544 
2545         if (sl->e->crypto.enabled && !sl->e->crypto.wpa_version)
2546         {
2547                 sl->e->crypto.auth_algs    = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
2548                 sl->e->crypto.pair_ciphers = IWINFO_CIPHER_WEP40 | IWINFO_CIPHER_WEP104;
2549         }
2550 
2551         sl->e++;
2552         sl->len++;
2553 
2554         return NL_SKIP;
2555 }
2556 
2557 static int nl80211_get_scanlist_nl(const char *ifname, char *buf, int *len)
2558 {
2559         struct nl80211_scanlist sl = { .e = (struct iwinfo_scanlist_entry *)buf };
2560 
2561         if (nl80211_request(ifname, NL80211_CMD_TRIGGER_SCAN, 0, NULL, NULL))
2562                 goto out;
2563 
2564         if (nl80211_wait("nl80211", "scan",
2565                          NL80211_CMD_NEW_SCAN_RESULTS, NL80211_CMD_SCAN_ABORTED))
2566                 goto out;
2567 
2568         if (nl80211_request(ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
2569                             nl80211_get_scanlist_cb, &sl))
2570                 goto out;
2571 
2572         *len = sl.len * sizeof(struct iwinfo_scanlist_entry);
2573         return 0;
2574 
2575 out:
2576         *len = 0;
2577         return -1;
2578 }
2579 
2580 static int wpasupp_ssid_decode(const char *in, char *out, int outlen)
2581 {
2582 #define hex(x) \
2583         (((x) >= 'a') ? ((x) - 'a' + 10) : \
2584                 (((x) >= 'A') ? ((x) - 'A' + 10) : ((x) - '')))
2585 
2586         int len = 0;
2587 
2588         while (*in)
2589         {
2590                 if (len + 1 >= outlen)
2591                         break;
2592 
2593                 switch (*in)
2594                 {
2595                 case '\\':
2596                         in++;
2597                         switch (*in)
2598                         {
2599                         case 'n':
2600                                 out[len++] = '\n'; in++;
2601                                 break;
2602 
2603                         case 'r':
2604                                 out[len++] = '\r'; in++;
2605                                 break;
2606 
2607                         case 't':
2608                                 out[len++] = '\t'; in++;
2609                                 break;
2610 
2611                         case 'e':
2612                                 out[len++] = '\033'; in++;
2613                                 break;
2614 
2615                         case 'x':
2616                                 if (isxdigit(*(in+1)) && isxdigit(*(in+2)))
2617                                         out[len++] = hex(*(in+1)) * 16 + hex(*(in+2));
2618                                 in += 3;
2619                                 break;
2620 
2621                         default:
2622                                 out[len++] = *in++;
2623                                 break;
2624                         }
2625                         break;
2626 
2627                 default:
2628                         out[len++] = *in++;
2629                         break;
2630                 }
2631         }
2632 
2633         if (outlen > len)
2634                 out[len] = '\0';
2635 
2636         return len;
2637 }
2638 
2639 static int nl80211_get_scanlist_wpactl(const char *ifname, char *buf, int *len)
2640 {
2641         int sock, qmax, rssi, tries, count = -1, ready = 0;
2642         char *pos, *line, *bssid, *freq, *signal, *flags, *ssid, reply[4096];
2643         struct sockaddr_un local = { 0 };
2644         struct iwinfo_scanlist_entry *e = (struct iwinfo_scanlist_entry *)buf;
2645 
2646         sock = nl80211_wpactl_connect(ifname, &local);
2647 
2648         if (sock < 0)
2649                 return sock;
2650 
2651         send(sock, "ATTACH", 6, 0);
2652         send(sock, "SCAN", 4, 0);
2653 
2654         /*
2655          * wait for scan results:
2656          *   nl80211_wpactl_recv() will use a timeout of 256ms and we need to scan
2657          *   72 channels at most. We'll also receive two "OK" messages acknowledging
2658          *   the "ATTACH" and "SCAN" commands and the driver might need a bit extra
2659          *   time to process the results, so try 72 + 2 + 1 times.
2660          */
2661         for (tries = 0; tries < 75; tries++)
2662         {
2663                 if (nl80211_wpactl_recv(sock, reply, sizeof(reply)) <= 0)
2664                         continue;
2665 
2666                 /* got an event notification */
2667                 if (reply[0] == '<')
2668                 {
2669                         /* scan results are ready */
2670                         if (strstr(reply, "CTRL-EVENT-SCAN-RESULTS"))
2671                         {
2672                                 /* send "SCAN_RESULTS" command */
2673                                 ready = (send(sock, "SCAN_RESULTS", 12, 0) == 12);
2674                                 break;
2675                         }
2676 
2677                         /* is another unrelated event, retry */
2678                         tries--;
2679                 }
2680 
2681                 /* scanning already in progress, keep awaiting results */
2682                 else if (!strcmp(reply, "FAIL-BUSY\n"))
2683                 {
2684                         tries--;
2685                 }
2686 
2687                 /* another failure, abort */
2688                 else if (!strncmp(reply, "FAIL-", 5))
2689                 {
2690                         break;
2691                 }
2692         }
2693 
2694         /* receive and parse scan results if the wait above didn't time out */
2695         while (ready && nl80211_wpactl_recv(sock, reply, sizeof(reply)) > 0)
2696         {
2697                 /* received an event notification, receive again */
2698                 if (reply[0] == '<')
2699                         continue;
2700 
2701                 nl80211_get_quality_max(ifname, &qmax);
2702 
2703                 for (line = strtok_r(reply, "\n", &pos);
2704                      line != NULL;
2705                      line = strtok_r(NULL, "\n", &pos))
2706                 {
2707                         /* skip header line */
2708                         if (count < 0)
2709                         {
2710                                 count++;
2711                                 continue;
2712                         }
2713 
2714                         bssid  = strtok(line, "\t");
2715                         freq   = strtok(NULL, "\t");
2716                         signal = strtok(NULL, "\t");
2717                         flags  = strtok(NULL, "\t");
2718                         ssid   = strtok(NULL, "\n");
2719 
2720                         if (!bssid || !freq || !signal || !flags)
2721                                 continue;
2722 
2723                         /* BSSID */
2724                         e->mac[0] = strtol(&bssid[0],  NULL, 16);
2725                         e->mac[1] = strtol(&bssid[3],  NULL, 16);
2726                         e->mac[2] = strtol(&bssid[6],  NULL, 16);
2727                         e->mac[3] = strtol(&bssid[9],  NULL, 16);
2728                         e->mac[4] = strtol(&bssid[12], NULL, 16);
2729                         e->mac[5] = strtol(&bssid[15], NULL, 16);
2730 
2731                         /* SSID */
2732                         if (ssid)
2733                                 wpasupp_ssid_decode(ssid, e->ssid, sizeof(e->ssid));
2734                         else
2735                                 e->ssid[0] = 0;
2736 
2737                         /* Mode */
2738                         if (strstr(flags, "[MESH]"))
2739                                 e->mode = IWINFO_OPMODE_MESHPOINT;
2740                         else if (strstr(flags, "[IBSS]"))
2741                                 e->mode = IWINFO_OPMODE_ADHOC;
2742                         else
2743                                 e->mode = IWINFO_OPMODE_MASTER;
2744 
2745                         /* Channel */
2746                         e->channel = nl80211_freq2channel(atoi(freq));
2747 
2748                         /* Signal */
2749                         rssi = atoi(signal);
2750                         e->signal = rssi;
2751 
2752                         /* Quality */
2753                         if (rssi < 0)
2754                         {
2755                                 /* The cfg80211 wext compat layer assumes a signal range
2756                                  * of -110 dBm to -40 dBm, the quality value is derived
2757                                  * by adding 110 to the signal level */
2758                                 if (rssi < -110)
2759                                         rssi = -110;
2760                                 else if (rssi > -40)
2761                                         rssi = -40;
2762 
2763                                 e->quality = (rssi + 110);
2764                         }
2765                         else
2766                         {
2767                                 e->quality = rssi;
2768                         }
2769 
2770                         /* Max. Quality */
2771                         e->quality_max = qmax;
2772 
2773                         /* Crypto */
2774                         nl80211_get_scancrypto(flags, &e->crypto);
2775 
2776                         count++;
2777                         e++;
2778                 }
2779 
2780                 *len = count * sizeof(struct iwinfo_scanlist_entry);
2781                 break;
2782         }
2783 
2784         close(sock);
2785         unlink(local.sun_path);
2786 
2787         return (count >= 0) ? 0 : -1;
2788 }
2789 
2790 static int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
2791 {
2792         char *res;
2793         int rv, mode;
2794 
2795         *len = 0;
2796 
2797         /* Got a radioX pseudo interface, find some interface on it or create one */
2798         if (!strncmp(ifname, "radio", 5))
2799         {
2800                 /* Reuse existing interface */
2801                 if ((res = nl80211_phy2ifname(ifname)) != NULL)
2802                 {
2803                         return nl80211_get_scanlist(res, buf, len);
2804                 }
2805 
2806                 /* Need to spawn a temporary iface for scanning */
2807                 else if ((res = nl80211_ifadd(ifname)) != NULL)
2808                 {
2809                         rv = nl80211_get_scanlist(res, buf, len);
2810                         nl80211_ifdel(res);
2811                         return rv;
2812                 }
2813         }
2814 
2815         /* WPA supplicant */
2816         if (!nl80211_get_scanlist_wpactl(ifname, buf, len))
2817         {
2818                 return 0;
2819         }
2820 
2821         /* station / ad-hoc / monitor scan */
2822         else if (!nl80211_get_mode(ifname, &mode) &&
2823                  (mode == IWINFO_OPMODE_ADHOC ||
2824                   mode == IWINFO_OPMODE_MASTER ||
2825                   mode == IWINFO_OPMODE_CLIENT ||
2826                   mode == IWINFO_OPMODE_MONITOR) &&
2827                  iwinfo_ifup(ifname))
2828         {
2829                 return nl80211_get_scanlist_nl(ifname, buf, len);
2830         }
2831 
2832         /* AP scan */
2833         else
2834         {
2835                 /* Got a temp interface, don't create yet another one */
2836                 if (!strncmp(ifname, "tmp.", 4))
2837                 {
2838                         if (!iwinfo_ifup(ifname))
2839                                 return -1;
2840 
2841                         rv = nl80211_get_scanlist_nl(ifname, buf, len);
2842                         iwinfo_ifdown(ifname);
2843                         return rv;
2844                 }
2845 
2846                 /* Spawn a new scan interface */
2847                 else
2848                 {
2849                         if (!(res = nl80211_ifadd(ifname)))
2850                                 return -1;
2851 
2852                         iwinfo_ifmac(res);
2853 
2854                         /* if we can take the new interface up, the driver supports an
2855                          * additional interface and there's no need to tear down the ap */
2856                         if (iwinfo_ifup(res))
2857                         {
2858                                 rv = nl80211_get_scanlist_nl(res, buf, len);
2859                                 iwinfo_ifdown(res);
2860                         }
2861 
2862                         /* driver cannot create secondary interface, take down ap
2863                          * during scan */
2864                         else if (iwinfo_ifdown(ifname) && iwinfo_ifup(res))
2865                         {
2866                                 rv = nl80211_get_scanlist_nl(res, buf, len);
2867                                 iwinfo_ifdown(res);
2868                                 iwinfo_ifup(ifname);
2869                                 nl80211_hostapd_hup(ifname);
2870                         }
2871 
2872                         nl80211_ifdel(res);
2873                         return rv;
2874                 }
2875         }
2876 
2877         return -1;
2878 }
2879 
2880 static int nl80211_get_freqlist_cb(struct nl_msg *msg, void *arg)
2881 {
2882         int bands_remain, freqs_remain;
2883 
2884         struct nl80211_array_buf *arr = arg;
2885         struct iwinfo_freqlist_entry *e;
2886 
2887         struct nlattr **attr = nl80211_parse(msg);
2888         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
2889         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
2890         struct nlattr *band, *freq;
2891 
2892         e = arr->buf;
2893         e += arr->count;
2894 
2895         if (attr[NL80211_ATTR_WIPHY_BANDS]) {
2896                 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
2897                 {
2898                         nla_parse(bands, NL80211_BAND_ATTR_MAX,
2899                                   nla_data(band), nla_len(band), NULL);
2900 
2901                         if (bands[NL80211_BAND_ATTR_FREQS]) {
2902                                 nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
2903                                 {
2904                                         nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
2905                                                   nla_data(freq), nla_len(freq), NULL);
2906 
2907                                         if (!freqs[NL80211_FREQUENCY_ATTR_FREQ] ||
2908                                             freqs[NL80211_FREQUENCY_ATTR_DISABLED])
2909                                                 continue;
2910 
2911                                         e->mhz = nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]);
2912                                         e->channel = nl80211_freq2channel(e->mhz);
2913 
2914                                         e->restricted = (
2915                                                 freqs[NL80211_FREQUENCY_ATTR_NO_IR] &&
2916                                                 !freqs[NL80211_FREQUENCY_ATTR_RADAR]
2917                                         ) ? 1 : 0;
2918 
2919                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_HT40_MINUS])
2920                                                 e->flags |= IWINFO_FREQ_NO_HT40MINUS;
2921                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_HT40_PLUS])
2922                                                 e->flags |= IWINFO_FREQ_NO_HT40PLUS;
2923                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_80MHZ])
2924                                                 e->flags |= IWINFO_FREQ_NO_80MHZ;
2925                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_160MHZ])
2926                                                 e->flags |= IWINFO_FREQ_NO_160MHZ;
2927                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_20MHZ])
2928                                                 e->flags |= IWINFO_FREQ_NO_20MHZ;
2929                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_10MHZ])
2930                                                 e->flags |= IWINFO_FREQ_NO_10MHZ;
2931 
2932                                         e++;
2933                                         arr->count++;
2934                                 }
2935                         }
2936                 }
2937         }
2938 
2939         return NL_SKIP;
2940 }
2941 
2942 static int nl80211_get_freqlist(const char *ifname, char *buf, int *len)
2943 {
2944         struct nl80211_msg_conveyor *cv;
2945         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
2946         uint32_t features = nl80211_get_protocol_features(ifname);
2947         int flags;
2948 
2949         flags = features & NL80211_PROTOCOL_FEATURE_SPLIT_WIPHY_DUMP ? NLM_F_DUMP : 0;
2950         cv = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, flags);
2951         if (!cv)
2952                 goto out;
2953 
2954         NLA_PUT_FLAG(cv->msg, NL80211_ATTR_SPLIT_WIPHY_DUMP);
2955         if (nl80211_send(cv, nl80211_get_freqlist_cb, &arr))
2956                 goto out;
2957 
2958         *len = arr.count * sizeof(struct iwinfo_freqlist_entry);
2959         return 0;
2960 
2961 nla_put_failure:
2962         nl80211_free(cv);
2963 out:
2964         *len = 0;
2965         return -1;
2966 }
2967 
2968 static int nl80211_get_country_cb(struct nl_msg *msg, void *arg)
2969 {
2970         char *buf = arg;
2971         struct nlattr **attr = nl80211_parse(msg);
2972 
2973         if (attr[NL80211_ATTR_REG_ALPHA2])
2974                 memcpy(buf, nla_data(attr[NL80211_ATTR_REG_ALPHA2]), 2);
2975         else
2976                 buf[0] = 0;
2977 
2978         return NL_SKIP;
2979 }
2980 
2981 static int nl80211_get_country(const char *ifname, char *buf)
2982 {
2983         if (nl80211_request(ifname, NL80211_CMD_GET_REG, 0,
2984                             nl80211_get_country_cb, buf))
2985                 return -1;
2986 
2987         return 0;
2988 }
2989 
2990 static int nl80211_get_countrylist(const char *ifname, char *buf, int *len)
2991 {
2992         int count;
2993         struct iwinfo_country_entry *e = (struct iwinfo_country_entry *)buf;
2994         const struct iwinfo_iso3166_label *l;
2995 
2996         for (l = IWINFO_ISO3166_NAMES, count = 0; l->iso3166; l++, e++, count++)
2997         {
2998                 e->iso3166 = l->iso3166;
2999                 e->ccode[0] = (l->iso3166 / 256);
3000                 e->ccode[1] = (l->iso3166 % 256);
3001                 e->ccode[2] = 0;
3002         }
3003 
3004         *len = (count * sizeof(struct iwinfo_country_entry));
3005         return 0;
3006 }
3007 
3008 
3009 struct nl80211_modes
3010 {
3011         bool ok;
3012         uint32_t hw;
3013         uint32_t ht;
3014 
3015         uint8_t bands;
3016 
3017         uint16_t nl_ht;
3018         uint32_t nl_vht;
3019         uint16_t he_phy_cap[6];
3020 };
3021 
3022 static int nl80211_eval_modelist(struct nl80211_modes *m)
3023 {
3024         /* Treat any nonzero capability as 11n */
3025         if (m->nl_ht > 0)
3026         {
3027                 m->hw |= IWINFO_80211_N;
3028                 m->ht |= IWINFO_HTMODE_HT20;
3029 
3030                 if (m->nl_ht & (1 << 1))
3031                         m->ht |= IWINFO_HTMODE_HT40;
3032         }
3033 
3034         if (m->he_phy_cap[0] != 0) {
3035                 m->hw |= IWINFO_80211_AX;
3036                 m->ht |= IWINFO_HTMODE_HE20;
3037 
3038                 if (m->he_phy_cap[0] & BIT(9))
3039                         m->ht |= IWINFO_HTMODE_HE40;
3040                 if (m->he_phy_cap[0] & BIT(10))
3041                         m->ht |= IWINFO_HTMODE_HE40 | IWINFO_HTMODE_HE80;
3042                 if (m->he_phy_cap[0] & BIT(11))
3043                         m->ht |= IWINFO_HTMODE_HE160;
3044                 if (m->he_phy_cap[0] & BIT(12))
3045                         m->ht |= IWINFO_HTMODE_HE160 | IWINFO_HTMODE_HE80_80;
3046         }
3047 
3048         if (m->bands & IWINFO_BAND_24)
3049         {
3050                 m->hw |= IWINFO_80211_B;
3051                 m->hw |= IWINFO_80211_G;
3052         }
3053 
3054         if (m->bands & IWINFO_BAND_5)
3055         {
3056                 /* Treat any nonzero capability as 11ac */
3057                 if (m->nl_vht > 0)
3058                 {
3059                         m->hw |= IWINFO_80211_AC;
3060                         m->ht |= IWINFO_HTMODE_VHT20 | IWINFO_HTMODE_VHT40 | IWINFO_HTMODE_VHT80;
3061 
3062                         switch ((m->nl_vht >> 2) & 3)
3063                         {
3064                         case 2:
3065                                 m->ht |= IWINFO_HTMODE_VHT80_80;
3066                                 /* fall through */
3067 
3068                         case 1:
3069                                 m->ht |= IWINFO_HTMODE_VHT160;
3070                         }
3071                 }
3072                 else
3073                 {
3074                         m->hw |= IWINFO_80211_A;
3075                 }
3076         }
3077 
3078         if (m->bands & IWINFO_BAND_60)
3079         {
3080                 m->hw |= IWINFO_80211_AD;
3081         }
3082 
3083 }
3084 
3085 static int nl80211_get_modelist_cb(struct nl_msg *msg, void *arg)
3086 {
3087         struct nl80211_modes *m = arg;
3088         int bands_remain, freqs_remain;
3089         uint16_t caps = 0;
3090         uint32_t vht_caps = 0;
3091         struct nlattr **attr = nl80211_parse(msg);
3092         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
3093         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
3094         struct nlattr *band, *freq;
3095         uint32_t freq_mhz;
3096 
3097         if (attr[NL80211_ATTR_WIPHY_BANDS])
3098         {
3099                 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
3100                 {
3101                         nla_parse(bands, NL80211_BAND_ATTR_MAX,
3102                                   nla_data(band), nla_len(band), NULL);
3103 
3104                         if (bands[NL80211_BAND_ATTR_HT_CAPA])
3105                                 m->nl_ht = nla_get_u16(bands[NL80211_BAND_ATTR_HT_CAPA]);
3106 
3107                         if (bands[NL80211_BAND_ATTR_VHT_CAPA])
3108                                 m->nl_vht = nla_get_u32(bands[NL80211_BAND_ATTR_VHT_CAPA]);
3109 
3110                         if (bands[NL80211_BAND_ATTR_IFTYPE_DATA]) {
3111                                 struct nlattr *tb[NL80211_BAND_IFTYPE_ATTR_MAX + 1];
3112                                 struct nlattr *nl_iftype;
3113                                 int rem_band;
3114                                 int len;
3115 
3116                                 nla_for_each_nested(nl_iftype, bands[NL80211_BAND_ATTR_IFTYPE_DATA], rem_band) {
3117                                         nla_parse(tb, NL80211_BAND_IFTYPE_ATTR_MAX,
3118                                                   nla_data(nl_iftype), nla_len(nl_iftype), NULL);
3119                                         if (tb[NL80211_BAND_IFTYPE_ATTR_HE_CAP_PHY]) {
3120                                                 len = nla_len(tb[NL80211_BAND_IFTYPE_ATTR_HE_CAP_PHY]);
3121 
3122                                                 if (len > sizeof(m->he_phy_cap) - 1)
3123                                                         len = sizeof(m->he_phy_cap) - 1;
3124                                                 memcpy(&((__u8 *)m->he_phy_cap)[1],
3125                                                         nla_data(tb[NL80211_BAND_IFTYPE_ATTR_HE_CAP_PHY]),
3126                                                         len);
3127                                         }
3128                                 }
3129                         }
3130 
3131                         if (bands[NL80211_BAND_ATTR_FREQS]) {
3132                                 nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS],
3133                                                     freqs_remain)
3134                                 {
3135                                         nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
3136                                                 nla_data(freq), nla_len(freq), NULL);
3137 
3138                                         if (!freqs[NL80211_FREQUENCY_ATTR_FREQ])
3139                                                 continue;
3140 
3141                                         freq_mhz = nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]);
3142 
3143                                         if (freq_mhz > 2400 && freq_mhz < 2485)
3144                                         {
3145                                                 m->bands |= IWINFO_BAND_24;
3146                                         }
3147                                         else if (freq_mhz > 5000 && freq_mhz < 5850)
3148                                         {
3149                                                 m->bands |= IWINFO_BAND_5;
3150                                         }
3151                                         else if (freq_mhz > 6000 && freq_mhz < 7120)
3152                                         {
3153                                                 m->bands |= IWINFO_BAND_6;
3154                                         }
3155                                         else if (freq_mhz >= 56160)
3156                                         {
3157                                                 m->bands |= IWINFO_BAND_60;
3158                                         }
3159                                 }
3160                         }
3161                 }
3162 
3163                 m->ok = 1;
3164         }
3165 
3166         return NL_SKIP;
3167 }
3168 
3169 static int nl80211_get_hwmodelist(const char *ifname, int *buf)
3170 {
3171         struct nl80211_msg_conveyor *cv;
3172         struct nl80211_modes m = {};
3173         uint32_t features = nl80211_get_protocol_features(ifname);
3174         int flags;
3175 
3176         flags = features & NL80211_PROTOCOL_FEATURE_SPLIT_WIPHY_DUMP ? NLM_F_DUMP : 0;
3177         cv = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, flags);
3178         if (!cv)
3179                 goto out;
3180 
3181         NLA_PUT_FLAG(cv->msg, NL80211_ATTR_SPLIT_WIPHY_DUMP);
3182         if (nl80211_send(cv, nl80211_get_modelist_cb, &m))
3183                 goto nla_put_failure;
3184 
3185         nl80211_eval_modelist(&m);
3186 
3187         *buf = m.hw;
3188 
3189         return 0;
3190 
3191 nla_put_failure:
3192         nl80211_free(cv);
3193 out:
3194         return -1;
3195 }
3196 
3197 struct chan_info {
3198         int width;
3199         int mode;
3200 };
3201 
3202 static int nl80211_get_htmode_cb(struct nl_msg *msg, void *arg)
3203 {
3204         struct nlattr **tb = nl80211_parse(msg);
3205         struct nlattr *cur;
3206         struct chan_info *chn = arg;
3207 
3208         if ((cur = tb[NL80211_ATTR_CHANNEL_WIDTH]))
3209                 chn->width = nla_get_u32(cur);
3210 
3211         if ((cur = tb[NL80211_ATTR_BSS_HT_OPMODE]))
3212                 chn->mode = nla_get_u32(cur);
3213 
3214         return NL_SKIP;
3215 }
3216 
3217 static int nl80211_get_htmode(const char *ifname, int *buf)
3218 {
3219         struct chan_info chn = { .width = 0, .mode = 0 };
3220         char *res;
3221         int err;
3222 
3223         res = nl80211_phy2ifname(ifname);
3224         *buf = 0;
3225 
3226         err =  nl80211_request(res ? res : ifname,
3227                                 NL80211_CMD_GET_INTERFACE, 0,
3228                                 nl80211_get_htmode_cb, &chn);
3229         if (err)
3230                 return -1;
3231 
3232         switch (chn.width) {
3233         case NL80211_CHAN_WIDTH_20:
3234                 if (chn.mode == -1)
3235                         *buf = IWINFO_HTMODE_VHT20;
3236                 else
3237                         *buf = IWINFO_HTMODE_HT20;
3238                 break;
3239         case NL80211_CHAN_WIDTH_40:
3240                 if (chn.mode == -1)
3241                         *buf = IWINFO_HTMODE_VHT40;
3242                 else
3243                         *buf = IWINFO_HTMODE_HT40;
3244                 break;
3245         case NL80211_CHAN_WIDTH_80:
3246                 *buf = IWINFO_HTMODE_VHT80;
3247                 break;
3248         case NL80211_CHAN_WIDTH_80P80:
3249                 *buf = IWINFO_HTMODE_VHT80_80;
3250                 break;
3251         case NL80211_CHAN_WIDTH_160:
3252                 *buf = IWINFO_HTMODE_VHT160;
3253                 break;
3254         case NL80211_CHAN_WIDTH_5:
3255         case NL80211_CHAN_WIDTH_10:
3256         case NL80211_CHAN_WIDTH_20_NOHT:
3257                 *buf = IWINFO_HTMODE_NOHT;
3258                 break;
3259         default:
3260                 return -1;
3261         }
3262 
3263         return 0;
3264 }
3265 
3266 static int nl80211_get_htmodelist(const char *ifname, int *buf)
3267 {
3268         struct nl80211_msg_conveyor *cv;
3269         struct nl80211_modes m = {};
3270         uint32_t features = nl80211_get_protocol_features(ifname);
3271         int flags;
3272 
3273         flags = features & NL80211_PROTOCOL_FEATURE_SPLIT_WIPHY_DUMP ? NLM_F_DUMP : 0;
3274         cv = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, flags);
3275         if (!cv)
3276                 goto out;
3277 
3278         NLA_PUT_FLAG(cv->msg, NL80211_ATTR_SPLIT_WIPHY_DUMP);
3279         if (nl80211_send(cv, nl80211_get_modelist_cb, &m))
3280                 goto nla_put_failure;
3281 
3282         nl80211_eval_modelist(&m);
3283 
3284         *buf = m.ht;
3285 
3286         return 0;
3287 
3288 nla_put_failure:
3289         nl80211_free(cv);
3290 out:
3291         return -1;
3292 }
3293 
3294 
3295 static int nl80211_get_ifcomb_cb(struct nl_msg *msg, void *arg)
3296 {
3297         struct nlattr **attr = nl80211_parse(msg);
3298         struct nlattr *comb;
3299         int *ret = arg;
3300         int comb_rem, limit_rem, mode_rem;
3301 
3302         *ret = 0;
3303         if (!attr[NL80211_ATTR_INTERFACE_COMBINATIONS])
3304                 return NL_SKIP;
3305 
3306         nla_for_each_nested(comb, attr[NL80211_ATTR_INTERFACE_COMBINATIONS], comb_rem)
3307         {
3308                 static struct nla_policy iface_combination_policy[NUM_NL80211_IFACE_COMB] = {
3309                         [NL80211_IFACE_COMB_LIMITS] = { .type = NLA_NESTED },
3310                         [NL80211_IFACE_COMB_MAXNUM] = { .type = NLA_U32 },
3311                 };
3312                 struct nlattr *tb_comb[NUM_NL80211_IFACE_COMB+1];
3313                 static struct nla_policy iface_limit_policy[NUM_NL80211_IFACE_LIMIT] = {
3314                         [NL80211_IFACE_LIMIT_TYPES] = { .type = NLA_NESTED },
3315                         [NL80211_IFACE_LIMIT_MAX] = { .type = NLA_U32 },
3316                 };
3317                 struct nlattr *tb_limit[NUM_NL80211_IFACE_LIMIT+1];
3318                 struct nlattr *limit;
3319 
3320                 nla_parse_nested(tb_comb, NUM_NL80211_IFACE_COMB, comb, iface_combination_policy);
3321 
3322                 if (!tb_comb[NL80211_IFACE_COMB_LIMITS])
3323                         continue;
3324 
3325                 nla_for_each_nested(limit, tb_comb[NL80211_IFACE_COMB_LIMITS], limit_rem)
3326                 {
3327                         struct nlattr *mode;
3328 
3329                         nla_parse_nested(tb_limit, NUM_NL80211_IFACE_LIMIT, limit, iface_limit_policy);
3330 
3331                         if (!tb_limit[NL80211_IFACE_LIMIT_TYPES] ||
3332                             !tb_limit[NL80211_IFACE_LIMIT_MAX])
3333                                 continue;
3334 
3335                         if (nla_get_u32(tb_limit[NL80211_IFACE_LIMIT_MAX]) < 2)
3336                                 continue;
3337 
3338                         nla_for_each_nested(mode, tb_limit[NL80211_IFACE_LIMIT_TYPES], mode_rem) {
3339                                 if (nla_type(mode) == NL80211_IFTYPE_AP)
3340                                         *ret = 1;
3341                         }
3342                 }
3343         }
3344 
3345         return NL_SKIP;
3346 }
3347 
3348 static int nl80211_get_mbssid_support(const char *ifname, int *buf)
3349 {
3350         if (nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
3351                             nl80211_get_ifcomb_cb, buf))
3352                 return -1;
3353 
3354         return 0;
3355 }
3356 
3357 static int nl80211_hardware_id_from_fdt(struct iwinfo_hardware_id *id, const char *ifname)
3358 {
3359         char *phy, compat[64], path[PATH_MAX];
3360         int i;
3361 
3362         /* Try to determine the phy name from the given interface */
3363         phy = nl80211_ifname2phy(ifname);
3364 
3365         snprintf(path, sizeof(path), "/sys/class/%s/%s/device/of_node/compatible",
3366                  phy ? "ieee80211" : "net", phy ? phy : ifname);
3367 
3368         if (nl80211_readstr(path, compat, sizeof(compat)) <= 0)
3369                 return -1;
3370 
3371         if (!strcmp(compat, "qca,ar9130-wmac")) {
3372                 id->vendor_id = 0x168c;
3373                 id->device_id = 0x0029;
3374                 id->subsystem_vendor_id = 0x168c;
3375                 id->subsystem_device_id = 0x9130;
3376         } else if (!strcmp(compat, "qca,ar9330-wmac")) {
3377                 id->vendor_id = 0x168c;
3378                 id->device_id = 0x0030;
3379                 id->subsystem_vendor_id = 0x168c;
3380                 id->subsystem_device_id = 0x9330;
3381         } else if (!strcmp(compat, "qca,ar9340-wmac")) {
3382                 id->vendor_id = 0x168c;
3383                 id->device_id = 0x0030;
3384                 id->subsystem_vendor_id = 0x168c;
3385                 id->subsystem_device_id = 0x9340;
3386         } else if (!strcmp(compat, "qca,qca9530-wmac")) {
3387                 id->vendor_id = 0x168c;
3388                 id->device_id = 0x0033;
3389                 id->subsystem_vendor_id = 0x168c;
3390                 id->subsystem_device_id = 0x9530;
3391         } else if (!strcmp(compat, "qca,qca9550-wmac")) {
3392                 id->vendor_id = 0x168c;
3393                 id->device_id = 0x0033;
3394                 id->subsystem_vendor_id = 0x168c;
3395                 id->subsystem_device_id = 0x9550;
3396         } else if (!strcmp(compat, "qca,qca9560-wmac")) {
3397                 id->vendor_id = 0x168c;
3398                 id->device_id = 0x0033;
3399                 id->subsystem_vendor_id = 0x168c;
3400                 id->subsystem_device_id = 0x9560;
3401         } else if (!strcmp(compat, "qcom,ipq4019-wifi")) {
3402                 id->vendor_id = 0x168c;
3403                 id->device_id = 0x003c;
3404                 id->subsystem_vendor_id = 0x168c;
3405                 id->subsystem_device_id = 0x4019;
3406         } else if (!strcmp(compat, "mediatek,mt7622-wmac")) {
3407                 id->vendor_id = 0x14c3;
3408                 id->device_id = 0x7622;
3409                 id->subsystem_vendor_id = 0x14c3;
3410                 id->subsystem_device_id = 0x7622;
3411         }
3412         return (id->vendor_id && id->device_id) ? 0 : -1;
3413 }
3414 
3415 
3416 static int nl80211_get_hardware_id(const char *ifname, char *buf)
3417 {
3418         struct iwinfo_hardware_id *id = (struct iwinfo_hardware_id *)buf;
3419         char *phy, num[8], path[PATH_MAX];
3420         int i;
3421 
3422         struct { const char *path; uint16_t *dest; } lookup[] = {
3423                 { "vendor", &id->vendor_id },
3424                 { "device", &id->device_id },
3425                 { "subsystem_vendor", &id->subsystem_vendor_id },
3426                 { "subsystem_device", &id->subsystem_device_id }
3427         };
3428 
3429         memset(id, 0, sizeof(*id));
3430 
3431         /* Try to determine the phy name from the given interface */
3432         phy = nl80211_ifname2phy(ifname);
3433 
3434         for (i = 0; i < ARRAY_SIZE(lookup); i++)
3435         {
3436                 snprintf(path, sizeof(path), "/sys/class/%s/%s/device/%s",
3437                          phy ? "ieee80211" : "net",
3438                          phy ? phy : ifname, lookup[i].path);
3439 
3440                 if (nl80211_readstr(path, num, sizeof(num)) > 0)
3441                         *lookup[i].dest = strtoul(num, NULL, 16);
3442         }
3443 
3444         /* Failed to obtain hardware IDs, try FDT */
3445         if (id->vendor_id == 0 || id->device_id == 0)
3446                 if (!nl80211_hardware_id_from_fdt(id, ifname))
3447                         return 0;
3448 
3449         /* Failed to obtain hardware IDs, search board config */
3450         if (id->vendor_id == 0 || id->device_id == 0)
3451                 return iwinfo_hardware_id_from_mtd(id);
3452 
3453         return 0;
3454 }
3455 
3456 static const struct iwinfo_hardware_entry *
3457 nl80211_get_hardware_entry(const char *ifname)
3458 {
3459         struct iwinfo_hardware_id id;
3460 
3461         if (nl80211_get_hardware_id(ifname, (char *)&id))
3462                 return NULL;
3463 
3464         return iwinfo_hardware(&id);
3465 }
3466 
3467 static int nl80211_get_hardware_name(const char *ifname, char *buf)
3468 {
3469         const struct iwinfo_hardware_entry *hw;
3470 
3471         if (!(hw = nl80211_get_hardware_entry(ifname)))
3472                 sprintf(buf, "Generic MAC80211");
3473         else
3474                 sprintf(buf, "%s %s", hw->vendor_name, hw->device_name);
3475 
3476         return 0;
3477 }
3478 
3479 static int nl80211_get_txpower_offset(const char *ifname, int *buf)
3480 {
3481         const struct iwinfo_hardware_entry *hw;
3482 
3483         if (!(hw = nl80211_get_hardware_entry(ifname)))
3484                 return -1;
3485 
3486         *buf = hw->txpower_offset;
3487         return 0;
3488 }
3489 
3490 static int nl80211_get_frequency_offset(const char *ifname, int *buf)
3491 {
3492         const struct iwinfo_hardware_entry *hw;
3493 
3494         if (!(hw = nl80211_get_hardware_entry(ifname)))
3495                 return -1;
3496 
3497         *buf = hw->frequency_offset;
3498         return 0;
3499 }
3500 
3501 static int nl80211_lookup_phyname(const char *section, char *buf)
3502 {
3503         int idx;
3504 
3505         if (!strncmp(section, "path=", 5))
3506                 idx = nl80211_phy_idx_from_path(section + 5);
3507         else if (!strncmp(section, "macaddr=", 8))
3508                 idx = nl80211_phy_idx_from_macaddr(section + 8);
3509         else
3510                 idx = nl80211_phy_idx_from_uci(section);
3511 
3512         if (idx < 0)
3513                 return -1;
3514 
3515         sprintf(buf, "phy%d", idx);
3516         return 0;
3517 }
3518 
3519 static int nl80211_phy_path(const char *phyname, const char **path)
3520 {
3521         if (strncmp(phyname, "phy", 3) != 0)
3522                 return -1;
3523 
3524         if (strchr(phyname, '/'))
3525                 return -1;
3526 
3527         *path = nl80211_phy_path_str(phyname);
3528         if (!*path)
3529                 return -1;
3530 
3531         return 0;
3532 }
3533 
3534 const struct iwinfo_ops nl80211_ops = {
3535         .name             = "nl80211",
3536         .probe            = nl80211_probe,
3537         .channel          = nl80211_get_channel,
3538         .center_chan1     = nl80211_get_center_chan1,
3539         .center_chan2     = nl80211_get_center_chan2,
3540         .frequency        = nl80211_get_frequency,
3541         .frequency_offset = nl80211_get_frequency_offset,
3542         .txpower          = nl80211_get_txpower,
3543         .txpower_offset   = nl80211_get_txpower_offset,
3544         .bitrate          = nl80211_get_bitrate,
3545         .signal           = nl80211_get_signal,
3546         .noise            = nl80211_get_noise,
3547         .quality          = nl80211_get_quality,
3548         .quality_max      = nl80211_get_quality_max,
3549         .mbssid_support   = nl80211_get_mbssid_support,
3550         .hwmodelist       = nl80211_get_hwmodelist,
3551         .htmodelist       = nl80211_get_htmodelist,
3552         .htmode           = nl80211_get_htmode,
3553         .mode             = nl80211_get_mode,
3554         .ssid             = nl80211_get_ssid,
3555         .bssid            = nl80211_get_bssid,
3556         .country          = nl80211_get_country,
3557         .hardware_id      = nl80211_get_hardware_id,
3558         .hardware_name    = nl80211_get_hardware_name,
3559         .encryption       = nl80211_get_encryption,
3560         .phyname          = nl80211_get_phyname,
3561         .assoclist        = nl80211_get_assoclist,
3562         .txpwrlist        = nl80211_get_txpwrlist,
3563         .scanlist         = nl80211_get_scanlist,
3564         .freqlist         = nl80211_get_freqlist,
3565         .countrylist      = nl80211_get_countrylist,
3566         .survey           = nl80211_get_survey,
3567         .lookup_phy       = nl80211_lookup_phyname,
3568         .phy_path         = nl80211_phy_path,
3569         .close            = nl80211_close
3570 };
3571 

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