• source navigation  • diff markup  • identifier search  • freetext search  • 

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 <sys/stat.h>
 26 #include <limits.h>
 27 #include <glob.h>
 28 #include <fnmatch.h>
 29 #include <stdarg.h>
 30 #include <stdlib.h>
 31 
 32 #include "iwinfo_nl80211.h"
 33 
 34 #define min(x, y) ((x) < (y)) ? (x) : (y)
 35 
 36 #define BIT(x) (1ULL<<(x))
 37 
 38 static struct nl80211_state *nls = NULL;
 39 
 40 static void nl80211_close(void)
 41 {
 42         if (nls)
 43         {
 44                 if (nls->nlctrl)
 45                         genl_family_put(nls->nlctrl);
 46 
 47                 if (nls->nl80211)
 48                         genl_family_put(nls->nl80211);
 49 
 50                 if (nls->nl_sock)
 51                         nl_socket_free(nls->nl_sock);
 52 
 53                 if (nls->nl_cache)
 54                         nl_cache_free(nls->nl_cache);
 55 
 56                 free(nls);
 57                 nls = NULL;
 58         }
 59 }
 60 
 61 static int nl80211_init(void)
 62 {
 63         int err, fd;
 64 
 65         if (!nls)
 66         {
 67                 nls = malloc(sizeof(struct nl80211_state));
 68                 if (!nls) {
 69                         err = -ENOMEM;
 70                         goto err;
 71                 }
 72 
 73                 memset(nls, 0, sizeof(*nls));
 74 
 75                 nls->nl_sock = nl_socket_alloc();
 76                 if (!nls->nl_sock) {
 77                         err = -ENOMEM;
 78                         goto err;
 79                 }
 80 
 81                 if (genl_connect(nls->nl_sock)) {
 82                         err = -ENOLINK;
 83                         goto err;
 84                 }
 85 
 86                 fd = nl_socket_get_fd(nls->nl_sock);
 87                 if (fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC) < 0) {
 88                         err = -EINVAL;
 89                         goto err;
 90                 }
 91 
 92                 if (genl_ctrl_alloc_cache(nls->nl_sock, &nls->nl_cache)) {
 93                         err = -ENOMEM;
 94                         goto err;
 95                 }
 96 
 97                 nls->nl80211 = genl_ctrl_search_by_name(nls->nl_cache, "nl80211");
 98                 if (!nls->nl80211) {
 99                         err = -ENOENT;
100                         goto err;
101                 }
102 
103                 nls->nlctrl = genl_ctrl_search_by_name(nls->nl_cache, "nlctrl");
104                 if (!nls->nlctrl) {
105                         err = -ENOENT;
106                         goto err;
107                 }
108         }
109 
110         return 0;
111 
112 
113 err:
114         nl80211_close();
115         return err;
116 }
117 
118 static int nl80211_readint(const char *path)
119 {
120         int fd;
121         int rv = -1;
122         char buffer[16];
123 
124         if ((fd = open(path, O_RDONLY)) > -1)
125         {
126                 if (read(fd, buffer, sizeof(buffer)) > 0)
127                         rv = atoi(buffer);
128 
129                 close(fd);
130         }
131 
132         return rv;
133 }
134 
135 static int nl80211_readstr(const char *path, char *buffer, int length)
136 {
137         int fd;
138         int rv = -1;
139 
140         if ((fd = open(path, O_RDONLY)) > -1)
141         {
142                 if ((rv = read(fd, buffer, length - 1)) > 0)
143                 {
144                         if (buffer[rv - 1] == '\n')
145                                 rv--;
146 
147                         buffer[rv] = 0;
148                 }
149 
150                 close(fd);
151         }
152 
153         return rv;
154 }
155 
156 static int nl80211_get_band(int nla_type)
157 {
158         switch (nla_type)
159         {
160         case NL80211_BAND_2GHZ:
161                 return IWINFO_BAND_24;
162         case NL80211_BAND_5GHZ:
163                 return IWINFO_BAND_5;
164         case NL80211_BAND_6GHZ:
165                 return IWINFO_BAND_6;
166         case NL80211_BAND_60GHZ:
167                 return IWINFO_BAND_60;
168         }
169 
170         return 0;
171 }
172 
173 
174 static int nl80211_msg_error(struct sockaddr_nl *nla,
175         struct nlmsgerr *err, void *arg)
176 {
177         int *ret = arg;
178         *ret = err->error;
179         return NL_STOP;
180 }
181 
182 static int nl80211_msg_finish(struct nl_msg *msg, void *arg)
183 {
184         int *ret = arg;
185         *ret = 0;
186         return NL_SKIP;
187 }
188 
189 static int nl80211_msg_ack(struct nl_msg *msg, void *arg)
190 {
191         int *ret = arg;
192         *ret = 0;
193         return NL_STOP;
194 }
195 
196 static int nl80211_msg_response(struct nl_msg *msg, void *arg)
197 {
198         return NL_SKIP;
199 }
200 
201 static void nl80211_free(struct nl80211_msg_conveyor *cv)
202 {
203         if (cv)
204         {
205                 if (cv->cb)
206                         nl_cb_put(cv->cb);
207 
208                 if (cv->msg)
209                         nlmsg_free(cv->msg);
210 
211                 cv->cb  = NULL;
212                 cv->msg = NULL;
213         }
214 }
215 
216 static struct nl80211_msg_conveyor * nl80211_new(struct genl_family *family,
217                                                  int cmd, int flags)
218 {
219         static struct nl80211_msg_conveyor cv;
220 
221         struct nl_msg *req = NULL;
222         struct nl_cb *cb = NULL;
223 
224         req = nlmsg_alloc();
225         if (!req)
226                 goto err;
227 
228         cb = nl_cb_alloc(NL_CB_DEFAULT);
229         if (!cb)
230                 goto err;
231 
232         genlmsg_put(req, 0, 0, genl_family_get_id(family), 0, flags, cmd, 0);
233 
234         cv.msg = req;
235         cv.cb  = cb;
236 
237         return &cv;
238 
239 err:
240         if (req)
241                 nlmsg_free(req);
242 
243         return NULL;
244 }
245 
246 static struct nl80211_msg_conveyor * nl80211_ctl(int cmd, int flags)
247 {
248         if (nl80211_init() < 0)
249                 return NULL;
250 
251         return nl80211_new(nls->nlctrl, cmd, flags);
252 }
253 
254 static const char *nl80211_phy_path_str(const char *phyname)
255 {
256         static char path[PATH_MAX];
257         const char *prefix = "/sys/devices/";
258         int prefix_len = strlen(prefix);
259         int buf_len, offset;
260         struct dirent *e;
261         char buf[512], *link;
262         int phy_idx;
263         int seq = 0;
264         DIR *d;
265 
266         snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/index", phyname);
267         phy_idx = nl80211_readint(buf);
268         if (phy_idx < 0)
269                 return NULL;
270 
271         buf_len = snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/device", phyname);
272         link = realpath(buf, path);
273         if (!link)
274                 return NULL;
275 
276         if (strncmp(link, prefix, prefix_len) != 0)
277                 return NULL;
278 
279         link += prefix_len;
280 
281         prefix = "platform/";
282         prefix_len = strlen(prefix);
283         if (!strncmp(link, prefix, prefix_len) && strstr(link, "/pci"))
284                 link += prefix_len;
285 
286         snprintf(buf + buf_len, sizeof(buf) - buf_len, "/ieee80211");
287         d = opendir(buf);
288         if (!d)
289                 return link;
290 
291         while ((e = readdir(d)) != NULL) {
292                 int cur_idx;
293 
294                 snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/index", e->d_name);
295                 cur_idx = nl80211_readint(buf);
296                 if (cur_idx < 0)
297                         continue;
298 
299                 if (cur_idx >= phy_idx)
300                         continue;
301 
302                 seq++;
303         }
304 
305         closedir(d);
306 
307         if (!seq)
308                 return link;
309 
310         offset = link - path + strlen(link);
311         snprintf(path + offset, sizeof(path) - offset, "+%d", seq);
312 
313         return link;
314 }
315 
316 static int nl80211_phy_idx_from_path(const char *path)
317 {
318         char buf[512];
319         struct dirent *e;
320         const char *cur_path;
321         int cur_path_len;
322         int path_len;
323         int idx = -1;
324         DIR *d;
325 
326         if (!path)
327                 return -1;
328 
329         path_len = strlen(path);
330         if (!path_len)
331                 return -1;
332 
333         d = opendir("/sys/class/ieee80211");
334         if (!d)
335                 return -1;
336 
337         while ((e = readdir(d)) != NULL) {
338                 cur_path = nl80211_phy_path_str(e->d_name);
339                 if (!cur_path)
340                         continue;
341 
342                 cur_path_len = strlen(cur_path);
343                 if (cur_path_len < path_len)
344                         continue;
345 
346                 if (strcmp(cur_path + cur_path_len - path_len, path) != 0)
347                         continue;
348 
349                 snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/index", e->d_name);
350                 idx = nl80211_readint(buf);
351 
352                 if (idx >= 0)
353                         break;
354         }
355 
356         closedir(d);
357 
358         return idx;
359 }
360 
361 static int nl80211_phy_idx_from_macaddr(const char *opt)
362 {
363         char buf[128];
364         int i, idx = -1;
365         glob_t gl;
366 
367         if (!opt)
368                 return -1;
369 
370         snprintf(buf, sizeof(buf), "/sys/class/ieee80211/*");
371         if (glob(buf, 0, NULL, &gl))
372                 return -1;
373 
374         for (i = 0; i < gl.gl_pathc; i++)
375         {
376                 snprintf(buf, sizeof(buf), "%s/macaddress", gl.gl_pathv[i]);
377                 if (nl80211_readstr(buf, buf, sizeof(buf)) <= 0)
378                         continue;
379 
380                 if (fnmatch(opt, buf, FNM_CASEFOLD))
381                         continue;
382 
383                 snprintf(buf, sizeof(buf), "%s/index", gl.gl_pathv[i]);
384                 if ((idx = nl80211_readint(buf)) > -1)
385                         break;
386         }
387 
388         globfree(&gl);
389 
390         return idx;
391 }
392 
393 static int nl80211_phy_idx_from_phy(const char *opt)
394 {
395         char buf[128];
396 
397         if (!opt)
398                 return -1;
399 
400         snprintf(buf, sizeof(buf), "/sys/class/ieee80211/%s/index", opt);
401         return nl80211_readint(buf);
402 }
403 
404 static int nl80211_phy_idx_from_uci(const char *name)
405 {
406         struct uci_section *s;
407         const char *opt;
408         int idx = -1;
409 
410         s = iwinfo_uci_get_radio(name, "mac80211");
411         if (!s)
412                 goto out;
413 
414         opt = uci_lookup_option_string(uci_ctx, s, "path");
415         idx = nl80211_phy_idx_from_path(opt);
416         if (idx >= 0)
417                 goto out;
418 
419         opt = uci_lookup_option_string(uci_ctx, s, "macaddr");
420         idx = nl80211_phy_idx_from_macaddr(opt);
421         if (idx >= 0)
422                 goto out;
423 
424         opt = uci_lookup_option_string(uci_ctx, s, "phy");
425         idx = nl80211_phy_idx_from_phy(opt);
426 
427 out:
428         iwinfo_uci_free();
429         return idx;
430 }
431 
432 static bool nl80211_is_ifname(const char *name)
433 {
434         struct stat st;
435         char buffer[PATH_MAX];
436 
437         snprintf(buffer, sizeof(buffer), "/sys/class/net/%s", name);
438         return !lstat(buffer, &st);
439 }
440 
441 static struct nl80211_msg_conveyor * nl80211_msg(const char *ifname,
442                                                  int cmd, int flags)
443 {
444         unsigned int ifidx = 0;
445         int phyidx = -1;
446         struct nl80211_msg_conveyor *cv;
447 
448         if (ifname == NULL)
449                 return NULL;
450 
451         if (nl80211_init() < 0)
452                 return NULL;
453 
454         if (!strncmp(ifname, "mon.", 4))
455                 ifidx = if_nametoindex(&ifname[4]);
456         else if (nl80211_is_ifname(ifname))
457                 ifidx = if_nametoindex(ifname);
458         else
459         {
460                 phyidx = nl80211_phy_idx_from_phy(ifname);
461                 if (phyidx < 0)
462                         phyidx = nl80211_phy_idx_from_uci(ifname);
463         }
464 
465         /* Valid ifidx must be greater than 0 */
466         if ((ifidx <= 0) && (phyidx < 0))
467                 return NULL;
468 
469         cv = nl80211_new(nls->nl80211, cmd, flags);
470         if (!cv)
471                 return NULL;
472 
473         if (ifidx > 0)
474                 NLA_PUT_U32(cv->msg, NL80211_ATTR_IFINDEX, ifidx);
475         else if (phyidx > -1)
476                 NLA_PUT_U32(cv->msg, NL80211_ATTR_WIPHY, phyidx);
477 
478         return cv;
479 
480 nla_put_failure:
481         nl80211_free(cv);
482         return NULL;
483 }
484 
485 static int nl80211_send(struct nl80211_msg_conveyor *cv,
486                         int (*cb_func)(struct nl_msg *, void *),
487                         void *cb_arg)
488 {
489         static struct nl80211_msg_conveyor rcv;
490         int err;
491 
492         if (cb_func)
493                 nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, cb_func, cb_arg);
494         else
495                 nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, nl80211_msg_response, &rcv);
496 
497         err = nl_send_auto_complete(nls->nl_sock, cv->msg);
498 
499         if (err < 0)
500                 goto out;
501 
502         err = 1;
503 
504         nl_cb_err(cv->cb,               NL_CB_CUSTOM, nl80211_msg_error,  &err);
505         nl_cb_set(cv->cb, NL_CB_FINISH, NL_CB_CUSTOM, nl80211_msg_finish, &err);
506         nl_cb_set(cv->cb, NL_CB_ACK,    NL_CB_CUSTOM, nl80211_msg_ack,    &err);
507 
508         while (err > 0)
509                 nl_recvmsgs(nls->nl_sock, cv->cb);
510 
511 out:
512         nl80211_free(cv);
513         return err;
514 }
515 
516 static int nl80211_request(const char *ifname, int cmd, int flags,
517                            int (*cb_func)(struct nl_msg *, void *),
518                            void *cb_arg)
519 {
520         struct nl80211_msg_conveyor *cv;
521 
522         cv = nl80211_msg(ifname, cmd, flags);
523 
524         if (!cv)
525                 return -ENOMEM;
526 
527         return nl80211_send(cv, cb_func, cb_arg);
528 }
529 
530 static struct nlattr ** nl80211_parse(struct nl_msg *msg)
531 {
532         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
533         static struct nlattr *attr[NL80211_ATTR_MAX + 1];
534 
535         nla_parse(attr, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
536                   genlmsg_attrlen(gnlh, 0), NULL);
537 
538         return attr;
539 }
540 
541 static int nl80211_get_protocol_features_cb(struct nl_msg *msg, void *arg)
542 {
543         uint32_t *features = arg;
544         struct nlattr **attr = nl80211_parse(msg);
545 
546         if (attr[NL80211_ATTR_PROTOCOL_FEATURES])
547                 *features = nla_get_u32(attr[NL80211_ATTR_PROTOCOL_FEATURES]);
548 
549         return NL_SKIP;
550 }
551 
552 static int nl80211_get_protocol_features(const char *ifname)
553 {
554         struct nl80211_msg_conveyor *req;
555         uint32_t features = 0;
556 
557         req = nl80211_msg(ifname, NL80211_CMD_GET_PROTOCOL_FEATURES, 0);
558         if (req) {
559                 nl80211_send(req, nl80211_get_protocol_features_cb, &features);
560                 nl80211_free(req);
561         }
562 
563         return features;
564 }
565 
566 static int nl80211_subscribe_cb(struct nl_msg *msg, void *arg)
567 {
568         struct nl80211_group_conveyor *cv = arg;
569 
570         struct nlattr **attr = nl80211_parse(msg);
571         struct nlattr *mgrpinfo[CTRL_ATTR_MCAST_GRP_MAX + 1];
572         struct nlattr *mgrp;
573         int mgrpidx;
574 
575         if (!attr[CTRL_ATTR_MCAST_GROUPS])
576                 return NL_SKIP;
577 
578         nla_for_each_nested(mgrp, attr[CTRL_ATTR_MCAST_GROUPS], mgrpidx)
579         {
580                 nla_parse(mgrpinfo, CTRL_ATTR_MCAST_GRP_MAX,
581                           nla_data(mgrp), nla_len(mgrp), NULL);
582 
583                 if (mgrpinfo[CTRL_ATTR_MCAST_GRP_ID] &&
584                     mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME] &&
585                     !strncmp(nla_data(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME]),
586                              cv->name, nla_len(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME])))
587                 {
588                         cv->id = nla_get_u32(mgrpinfo[CTRL_ATTR_MCAST_GRP_ID]);
589                         break;
590                 }
591         }
592 
593         return NL_SKIP;
594 }
595 
596 static int nl80211_subscribe(const char *family, const char *group)
597 {
598         struct nl80211_group_conveyor cv = { .name = group, .id = -ENOENT };
599         struct nl80211_msg_conveyor *req;
600         int err;
601 
602         req = nl80211_ctl(CTRL_CMD_GETFAMILY, 0);
603         if (req)
604         {
605                 NLA_PUT_STRING(req->msg, CTRL_ATTR_FAMILY_NAME, family);
606                 err = nl80211_send(req, nl80211_subscribe_cb, &cv);
607 
608                 if (err)
609                         return err;
610 
611                 return nl_socket_add_membership(nls->nl_sock, cv.id);
612 
613 nla_put_failure:
614                 nl80211_free(req);
615         }
616 
617         return -ENOMEM;
618 }
619 
620 
621 static int nl80211_wait_cb(struct nl_msg *msg, void *arg)
622 {
623         struct nl80211_event_conveyor *cv = arg;
624         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
625 
626         if (cv->wait[gnlh->cmd / 32] & (1 << (gnlh->cmd % 32)))
627                 cv->recv = gnlh->cmd;
628 
629         return NL_SKIP;
630 }
631 
632 static int nl80211_wait_seq_check(struct nl_msg *msg, void *arg)
633 {
634         return NL_OK;
635 }
636 
637 static int __nl80211_wait(const char *family, const char *group, ...)
638 {
639         struct nl80211_event_conveyor cv = { };
640         struct nl_cb *cb;
641         int err = 0;
642         int cmd;
643         va_list ap;
644 
645         if (nl80211_subscribe(family, group))
646                 return -ENOENT;
647 
648         cb = nl_cb_alloc(NL_CB_DEFAULT);
649 
650         if (!cb)
651                 return -ENOMEM;
652 
653         nl_cb_err(cb,                  NL_CB_CUSTOM, nl80211_msg_error,      &err);
654         nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, nl80211_wait_seq_check, NULL);
655         nl_cb_set(cb, NL_CB_VALID,     NL_CB_CUSTOM, nl80211_wait_cb,        &cv );
656 
657         va_start(ap, group);
658 
659         for (cmd = va_arg(ap, int); cmd != 0; cmd = va_arg(ap, int))
660                 cv.wait[cmd / 32] |= (1 << (cmd % 32));
661 
662         va_end(ap);
663 
664         while (!cv.recv && !err)
665                 nl_recvmsgs(nls->nl_sock, cb);
666 
667         nl_cb_put(cb);
668 
669         return err;
670 }
671 
672 #define nl80211_wait(family, group, ...) \
673         __nl80211_wait(family, group, __VA_ARGS__, 0)
674 
675 /* This is linux's ieee80211_freq_khz_to_channel() which is:
676  * SPDX-License-Identifier: GPL-2.0
677  * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
678  * Copyright 2013-2014 Intel Mobile Communications GmbH
679  * Copyright 2017 Intel Deutschland GmbH
680  * Copyright (C) 2018-2022 Intel Corporation
681  */
682 static int nl80211_freq2channel(int freq)
683 {
684         if (freq == 2484)
685                 return 14;
686         else if (freq < 2484)
687                 return (freq - 2407) / 5;
688         else if (freq >= 4910 && freq <= 4980)
689                 return (freq - 4000) / 5;
690         else if (freq < 5925)
691                 return (freq - 5000) / 5;
692         else if (freq == 5935)
693                 return 2;
694         else if (freq <= 45000) /* DMG band lower limit */
695                 /* see 802.11ax D6.1 27.3.22.2 */
696                 return (freq - 5950) / 5;
697         else if (freq >= 58320 && freq <= 70200)
698                 return (freq - 56160) / 2160;
699         else
700                 return 0;
701 }
702 
703 /* This is linux's ieee80211_channel_to_freq_khz() which is:
704  * SPDX-License-Identifier: GPL-2.0
705  * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
706  * Copyright 2013-2014 Intel Mobile Communications GmbH
707  * Copyright 2017 Intel Deutschland GmbH
708  * Copyright (C) 2018-2022 Intel Corporation
709  */
710 static int nl80211_channel2freq(int channel, const char *band, bool ax)
711 {
712         if (channel < 1)
713                 return 0;
714 
715         if (!band || band[0] != 'a')
716         {
717                 if (channel == 14)
718                         return 2484;
719                 else if (channel < 14)
720                         return (channel * 5) + 2407;
721         }
722         else if (strcmp(band, "ad")  == 0)
723         {
724                 if (channel < 7)
725                         return 56160 + 2160 * channel;
726         }
727         else if (ax)
728         {
729                 if (channel == 2)
730                         return 5935;
731                 if (channel < 233)
732                         return (channel * 5) + 5950;
733         }
734         else
735         {
736                 if (channel >= 182 && channel <= 196)
737                         return (channel * 5) + 4000;
738                 else
739                         return (channel * 5) + 5000;
740         }
741 
742         return 0;
743 }
744 
745 static uint8_t nl80211_freq2band(int freq)
746 {
747         if (freq >= 2412 && freq <= 2484)
748                 return IWINFO_BAND_24;
749         else if (freq >= 5160 && freq <= 5885)
750                 return IWINFO_BAND_5;
751         else if (freq >= 5925 && freq <= 7125)
752                 return IWINFO_BAND_6;
753         else if (freq >= 58320 && freq <= 69120)
754                 return IWINFO_BAND_60;
755 
756         return 0;
757 }
758 
759 static int nl80211_phyname_cb(struct nl_msg *msg, void *arg)
760 {
761         char *buf = arg;
762         struct nlattr **attr = nl80211_parse(msg);
763 
764         if (attr[NL80211_ATTR_WIPHY_NAME])
765                 memcpy(buf, nla_data(attr[NL80211_ATTR_WIPHY_NAME]),
766                        nla_len(attr[NL80211_ATTR_WIPHY_NAME]));
767         else
768                 buf[0] = 0;
769 
770         return NL_SKIP;
771 }
772 
773 static char * nl80211_ifname2phy(const char *ifname)
774 {
775         static char phy[32] = { 0 };
776 
777         memset(phy, 0, sizeof(phy));
778 
779         nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
780                         nl80211_phyname_cb, phy);
781 
782         return phy[0] ? phy : NULL;
783 }
784 
785 static char * nl80211_phyidx2name(unsigned int idx)
786 {
787         struct nl80211_msg_conveyor *cv;
788         static char phy[32] = { 0 };
789 
790         if (nl80211_init() < 0)
791                 return NULL;
792 
793         cv = nl80211_new(nls->nl80211, NL80211_CMD_GET_WIPHY, 0);
794         if (!cv)
795                 return NULL;
796 
797         NLA_PUT_U32(cv->msg, NL80211_ATTR_WIPHY, idx);
798 
799         memset(phy, 0, sizeof(phy));
800         nl80211_send(cv, nl80211_phyname_cb, phy);
801 
802         return phy[0] ? phy : NULL;
803 
804 nla_put_failure:
805         return NULL;
806 }
807 
808 static char * nl80211_phy2ifname(const char *ifname)
809 {
810         int ifidx = -1, cifidx, lmode = 1, clmode, phyidx;
811         char buffer[512];
812         static char nif[IFNAMSIZ] = { 0 };
813         DIR *d;
814         struct dirent *e;
815 
816         /* Only accept phy name in the form of phy%d or radio%d */
817         if (!ifname)
818                 return NULL;
819 
820         phyidx = nl80211_phy_idx_from_phy(ifname);
821         if (phyidx < 0)
822                 phyidx = nl80211_phy_idx_from_uci(ifname);;
823         if (phyidx < 0)
824                 return NULL;
825 
826         memset(nif, 0, sizeof(nif));
827 
828         if ((d = opendir("/sys/class/net")) != NULL)
829         {
830                 while ((e = readdir(d)) != NULL)
831                 {
832                         snprintf(buffer, sizeof(buffer),
833                                  "/sys/class/net/%s/phy80211/index", e->d_name);
834                         if (nl80211_readint(buffer) != phyidx)
835                                 continue;
836 
837                         snprintf(buffer, sizeof(buffer),
838                                  "/sys/class/net/%s/ifindex", e->d_name);
839                         cifidx = nl80211_readint(buffer);
840 
841                         if (cifidx < 0)
842                                 continue;
843 
844                         snprintf(buffer, sizeof(buffer),
845                                  "/sys/class/net/%s/link_mode", e->d_name);
846                         clmode = nl80211_readint(buffer);
847 
848                         /* prefer non-supplicant-based devices */
849                         if ((ifidx < 0) || (cifidx < ifidx) || ((lmode == 1) && (clmode != 1)))
850                         {
851                                 ifidx = cifidx;
852                                 lmode = clmode;
853                                 strncpy(nif, e->d_name, sizeof(nif) - 1);
854                         }
855                 }
856 
857                 closedir(d);
858         }
859 
860         return nif[0] ? nif : NULL;
861 }
862 
863 static int nl80211_get_mode_cb(struct nl_msg *msg, void *arg)
864 {
865         int *mode = arg;
866         struct nlattr **tb = nl80211_parse(msg);
867         const int ifmodes[NL80211_IFTYPE_MAX + 1] = {
868                 IWINFO_OPMODE_UNKNOWN,          /* unspecified */
869                 IWINFO_OPMODE_ADHOC,            /* IBSS */
870                 IWINFO_OPMODE_CLIENT,           /* managed */
871                 IWINFO_OPMODE_MASTER,           /* AP */
872                 IWINFO_OPMODE_AP_VLAN,          /* AP/VLAN */
873                 IWINFO_OPMODE_WDS,              /* WDS */
874                 IWINFO_OPMODE_MONITOR,          /* monitor */
875                 IWINFO_OPMODE_MESHPOINT,        /* mesh point */
876                 IWINFO_OPMODE_P2P_CLIENT,       /* P2P-client */
877                 IWINFO_OPMODE_P2P_GO,           /* P2P-GO */
878         };
879 
880         if (tb[NL80211_ATTR_IFTYPE])
881                 *mode = ifmodes[nla_get_u32(tb[NL80211_ATTR_IFTYPE])];
882 
883         return NL_SKIP;
884 }
885 
886 
887 static int nl80211_get_mode(const char *ifname, int *buf)
888 {
889         char *res;
890 
891         *buf = IWINFO_OPMODE_UNKNOWN;
892 
893         res = nl80211_phy2ifname(ifname);
894 
895         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
896                         nl80211_get_mode_cb, buf);
897 
898         return (*buf == IWINFO_OPMODE_UNKNOWN) ? -1 : 0;
899 }
900 
901 static int __nl80211_hostapd_query(const char *ifname, ...)
902 {
903         va_list ap, ap_cur;
904         char *phy, *search, *dest, *key, *val, buf[128];
905         int len, mode, found = 0, match = 1;
906         FILE *fp;
907 
908         if (nl80211_get_mode(ifname, &mode))
909                 return 0;
910 
911         if (mode != IWINFO_OPMODE_MASTER && mode != IWINFO_OPMODE_AP_VLAN)
912                 return 0;
913 
914         phy = nl80211_ifname2phy(ifname);
915 
916         if (!phy)
917                 return 0;
918 
919         snprintf(buf, sizeof(buf), "/var/run/hostapd-%s.conf", phy);
920         fp = fopen(buf, "r");
921 
922         if (!fp)
923                 return 0;
924 
925         va_start(ap, ifname);
926 
927         /* clear all destination buffers */
928         va_copy(ap_cur, ap);
929 
930         while ((search = va_arg(ap_cur, char *)) != NULL)
931         {
932                 dest = va_arg(ap_cur, char *);
933                 len  = va_arg(ap_cur, int);
934 
935                 memset(dest, 0, len);
936         }
937 
938         va_end(ap_cur);
939 
940         /* iterate applicable lines and copy found values into dest buffers */
941         while (fgets(buf, sizeof(buf), fp))
942         {
943                 key = strtok(buf, " =\t\n");
944                 val = strtok(NULL, "\n");
945 
946                 if (!key || !val || !*key || *key == '#')
947                         continue;
948 
949                 if (!strcmp(key, "interface") || !strcmp(key, "bss"))
950                         match = !strcmp(ifname, val);
951 
952                 if (!match)
953                         continue;
954 
955                 va_copy(ap_cur, ap);
956 
957                 while ((search = va_arg(ap_cur, char *)) != NULL)
958                 {
959                         dest = va_arg(ap_cur, char *);
960                         len  = va_arg(ap_cur, int);
961 
962                         if (!strcmp(search, key))
963                         {
964                                 strncpy(dest, val, len - 1);
965                                 found++;
966                                 break;
967                         }
968                 }
969 
970                 va_end(ap_cur);
971         }
972 
973         fclose(fp);
974 
975         va_end(ap);
976 
977         return found;
978 }
979 
980 #define nl80211_hostapd_query(ifname, ...) \
981         __nl80211_hostapd_query(ifname, ##__VA_ARGS__, NULL)
982 
983 
984 static inline int nl80211_wpactl_recv(int sock, char *buf, int blen)
985 {
986         fd_set rfds;
987         struct timeval tv = { 0, 256000 };
988 
989         FD_ZERO(&rfds);
990         FD_SET(sock, &rfds);
991 
992         memset(buf, 0, blen);
993 
994         if (select(sock + 1, &rfds, NULL, NULL, &tv) < 0)
995                 return -1;
996 
997         if (!FD_ISSET(sock, &rfds))
998                 return -1;
999 
1000         return recv(sock, buf, blen - 1, 0);
1001 }
1002 
1003 static int nl80211_wpactl_connect(const char *ifname, struct sockaddr_un *local)
1004 {
1005         struct sockaddr_un remote = { 0 };
1006         size_t remote_length, local_length;
1007 
1008         int sock = socket(PF_UNIX, SOCK_DGRAM, 0);
1009         if (sock < 0)
1010                 return sock;
1011 
1012         remote.sun_family = AF_UNIX;
1013         remote_length = sizeof(remote.sun_family) +
1014                 sprintf(remote.sun_path, "/var/run/wpa_supplicant/%s", ifname);
1015 
1016         /* Set client socket file permissions so that bind() creates the client
1017         * socket with these permissions and there is no need to try to change
1018         * them with chmod() after bind() which would have potential issues with
1019         * race conditions. These permissions are needed to make sure the server
1020         * side (wpa_supplicant or hostapd) can reply to the control interface
1021         * messages.
1022         *
1023         * The lchown() calls below after bind() are also part of the needed
1024         * operations to allow the response to go through. Those are using the
1025         * no-deference-symlinks version to avoid races. */
1026         fchmod(sock, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
1027 
1028         if (fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC) < 0)
1029         {
1030                 close(sock);
1031                 return -1;
1032         }
1033 
1034         if (connect(sock, (struct sockaddr *)&remote, remote_length))
1035         {
1036                 close(sock);
1037                 return -1;
1038         }
1039 
1040         local->sun_family = AF_UNIX;
1041         local_length = sizeof(local->sun_family) +
1042                 sprintf(local->sun_path, "/var/run/iwinfo-%s-%d", ifname, getpid());
1043 
1044         if (bind(sock, (struct sockaddr *)local, local_length) < 0)
1045         {
1046                 close(sock);
1047                 return -1;
1048         }
1049 
1050         /* Set group even if we do not have privileges to change owner */
1051         lchown(local->sun_path, -1, 101);
1052         lchown(local->sun_path, 101, 101);
1053 
1054         return sock;
1055 }
1056 
1057 static int __nl80211_wpactl_query(const char *ifname, ...)
1058 {
1059         va_list ap, ap_cur;
1060         struct sockaddr_un local = { 0 };
1061         int len, mode, found = 0, sock = -1;
1062         char *search, *dest, *key, *val, *line, *pos, buf[512];
1063 
1064         if (nl80211_get_mode(ifname, &mode))
1065                 return 0;
1066 
1067         if (mode != IWINFO_OPMODE_CLIENT &&
1068             mode != IWINFO_OPMODE_ADHOC &&
1069             mode != IWINFO_OPMODE_MESHPOINT)
1070                 return 0;
1071 
1072         sock = nl80211_wpactl_connect(ifname, &local);
1073 
1074         if (sock < 0)
1075                 return 0;
1076 
1077         va_start(ap, ifname);
1078 
1079         /* clear all destination buffers */
1080         va_copy(ap_cur, ap);
1081 
1082         while ((search = va_arg(ap_cur, char *)) != NULL)
1083         {
1084                 dest = va_arg(ap_cur, char *);
1085                 len  = va_arg(ap_cur, int);
1086 
1087                 memset(dest, 0, len);
1088         }
1089 
1090         va_end(ap_cur);
1091 
1092         send(sock, "STATUS", 6, 0);
1093 
1094         while (true)
1095         {
1096                 if (nl80211_wpactl_recv(sock, buf, sizeof(buf)) <= 0)
1097                         break;
1098 
1099                 if (buf[0] == '<')
1100                         continue;
1101 
1102                 for (line = strtok_r(buf, "\n", &pos);
1103                          line != NULL;
1104                          line = strtok_r(NULL, "\n", &pos))
1105                 {
1106                         key = strtok(line, "=");
1107                         val = strtok(NULL, "\n");
1108 
1109                         if (!key || !val)
1110                                 continue;
1111 
1112                         va_copy(ap_cur, ap);
1113 
1114                         while ((search = va_arg(ap_cur, char *)) != NULL)
1115                         {
1116                                 dest = va_arg(ap_cur, char *);
1117                                 len  = va_arg(ap_cur, int);
1118 
1119                                 if (!strcmp(search, key))
1120                                 {
1121                                         strncpy(dest, val, len - 1);
1122                                         found++;
1123                                         break;
1124                                 }
1125                         }
1126 
1127                         va_end(ap_cur);
1128                 }
1129 
1130                 break;
1131         }
1132 
1133         va_end(ap);
1134 
1135         close(sock);
1136         unlink(local.sun_path);
1137 
1138         return found;
1139 }
1140 
1141 #define nl80211_wpactl_query(ifname, ...) \
1142         __nl80211_wpactl_query(ifname, ##__VA_ARGS__, NULL)
1143 
1144 
1145 static char * nl80211_ifadd(const char *ifname)
1146 {
1147         char path[PATH_MAX];
1148         static char nif[IFNAMSIZ] = { 0 };
1149         struct nl80211_msg_conveyor *req;
1150         FILE *sysfs;
1151 
1152         req = nl80211_msg(ifname, NL80211_CMD_NEW_INTERFACE, 0);
1153         if (req)
1154         {
1155                 snprintf(nif, sizeof(nif), "tmp.%s", ifname);
1156 
1157                 NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, nif);
1158                 NLA_PUT_U32(req->msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_STATION);
1159 
1160                 nl80211_send(req, NULL, NULL);
1161 
1162                 snprintf(path, sizeof(path) - 1,
1163                          "/proc/sys/net/ipv6/conf/%s/disable_ipv6", nif);
1164 
1165                 if ((sysfs = fopen(path, "w")) != NULL)
1166                 {
1167                         fwrite("\n", 1, 2, sysfs);
1168                         fclose(sysfs);
1169                 }
1170 
1171                 return nif;
1172 
1173         nla_put_failure:
1174                 nl80211_free(req);
1175         }
1176 
1177         return NULL;
1178 }
1179 
1180 static void nl80211_ifdel(const char *ifname)
1181 {
1182         struct nl80211_msg_conveyor *req;
1183 
1184         req = nl80211_msg(ifname, NL80211_CMD_DEL_INTERFACE, 0);
1185         if (req)
1186         {
1187                 NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, ifname);
1188 
1189                 nl80211_send(req, NULL, NULL);
1190                 return;
1191 
1192         nla_put_failure:
1193                 nl80211_free(req);
1194         }
1195 }
1196 
1197 static void nl80211_hostapd_hup(const char *ifname)
1198 {
1199         int fd, pid = 0;
1200         char buf[32];
1201         char *phy = nl80211_ifname2phy(ifname);
1202 
1203         if (phy)
1204         {
1205                 snprintf(buf, sizeof(buf), "/var/run/wifi-%s.pid", phy);
1206                 if ((fd = open(buf, O_RDONLY)) >= 0)
1207                 {
1208                         if (read(fd, buf, sizeof(buf)) > 0)
1209                                 pid = atoi(buf);
1210 
1211                         close(fd);
1212                 }
1213 
1214                 if (pid > 0)
1215                         kill(pid, 1);
1216         }
1217 }
1218 
1219 
1220 static int nl80211_probe(const char *ifname)
1221 {
1222         return !!nl80211_ifname2phy(ifname);
1223 }
1224 
1225 struct nl80211_ssid_bssid {
1226         unsigned char *ssid;
1227         unsigned char bssid[7];
1228 };
1229 
1230 static int nl80211_get_macaddr_cb(struct nl_msg *msg, void *arg)
1231 {
1232         struct nl80211_ssid_bssid *sb = arg;
1233         struct nlattr **tb = nl80211_parse(msg);
1234 
1235         if (tb[NL80211_ATTR_MAC]) {
1236                 sb->bssid[0] = 1;
1237                 memcpy(sb->bssid + 1, nla_data(tb[NL80211_ATTR_MAC]),
1238                        sizeof(sb->bssid) - 1);
1239         }
1240 
1241         return NL_SKIP;
1242 }
1243 
1244 static int nl80211_get_ssid_bssid_cb(struct nl_msg *msg, void *arg)
1245 {
1246         int ielen;
1247         unsigned char *ie;
1248         struct nl80211_ssid_bssid *sb = arg;
1249         struct nlattr **tb = nl80211_parse(msg);
1250         struct nlattr *bss[NL80211_BSS_MAX + 1];
1251 
1252         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
1253                 [NL80211_BSS_INFORMATION_ELEMENTS] = { 0 },
1254                 [NL80211_BSS_STATUS]               = { .type = NLA_U32 },
1255         };
1256 
1257         if (!tb[NL80211_ATTR_BSS] ||
1258             nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
1259                              bss_policy) ||
1260             !bss[NL80211_BSS_BSSID] ||
1261             !bss[NL80211_BSS_STATUS] ||
1262             !bss[NL80211_BSS_INFORMATION_ELEMENTS])
1263         {
1264                 return NL_SKIP;
1265         }
1266 
1267         switch (nla_get_u32(bss[NL80211_BSS_STATUS]))
1268         {
1269         case NL80211_BSS_STATUS_ASSOCIATED:
1270         case NL80211_BSS_STATUS_AUTHENTICATED:
1271         case NL80211_BSS_STATUS_IBSS_JOINED:
1272 
1273                 if (sb->ssid)
1274                 {
1275                         ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
1276                         ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
1277 
1278                         while (ielen >= 2 && ielen >= ie[1])
1279                         {
1280                                 if (ie[0] == 0)
1281                                 {
1282                                         memcpy(sb->ssid, ie + 2, min(ie[1], IWINFO_ESSID_MAX_SIZE));
1283                                         return NL_SKIP;
1284                                 }
1285 
1286                                 ielen -= ie[1] + 2;
1287                                 ie += ie[1] + 2;
1288                         }
1289                 }
1290                 else
1291                 {
1292                         sb->bssid[0] = 1;
1293                         memcpy(sb->bssid + 1, nla_data(bss[NL80211_BSS_BSSID]), 6);
1294                         return NL_SKIP;
1295                 }
1296 
1297         default:
1298                 return NL_SKIP;
1299         }
1300 }
1301 
1302 static int nl80211_get_ssid(const char *ifname, char *buf)
1303 {
1304         char *res;
1305         struct nl80211_ssid_bssid sb = { .ssid = (unsigned char *)buf };
1306 
1307         /* try to find ssid from scan dump results */
1308         res = nl80211_phy2ifname(ifname);
1309         sb.ssid[0] = 0;
1310 
1311         nl80211_request(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1312                         nl80211_get_ssid_bssid_cb, &sb);
1313 
1314         /* failed, try to find from hostapd info */
1315         if (sb.ssid[0] == 0)
1316                 nl80211_hostapd_query(ifname, "ssid", sb.ssid,
1317                                       IWINFO_ESSID_MAX_SIZE + 1);
1318 
1319         /* failed, try to obtain Mesh ID */
1320         if (sb.ssid[0] == 0)
1321                 iwinfo_ubus_query(res ? res : ifname, "mesh_id",
1322                                   buf, IWINFO_ESSID_MAX_SIZE + 1);
1323 
1324         return (sb.ssid[0] == 0) ? -1 : 0;
1325 }
1326 
1327 static int nl80211_get_bssid(const char *ifname, char *buf)
1328 {
1329         char *res, bssid[sizeof("FF:FF:FF:FF:FF:FF\0")];
1330         struct nl80211_ssid_bssid sb = { };
1331 
1332         res = nl80211_phy2ifname(ifname);
1333 
1334         /* try to obtain mac address via NL80211_CMD_GET_INTERFACE */
1335         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1336                         nl80211_get_macaddr_cb, &sb);
1337 
1338         /* failed, try to find bssid from scan dump results */
1339         if (sb.bssid[0] == 0)
1340                 nl80211_request(res ? res : ifname,
1341                                 NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1342                                 nl80211_get_ssid_bssid_cb, &sb);
1343 
1344         /* failed, try to find mac from hostapd info */
1345         if ((sb.bssid[0] == 0) &&
1346             nl80211_hostapd_query(ifname, "bssid", bssid, sizeof(bssid)))
1347         {
1348                 sb.bssid[0] = 1;
1349                 sb.bssid[1] = strtol(&bssid[0],  NULL, 16);
1350                 sb.bssid[2] = strtol(&bssid[3],  NULL, 16);
1351                 sb.bssid[3] = strtol(&bssid[6],  NULL, 16);
1352                 sb.bssid[4] = strtol(&bssid[9],  NULL, 16);
1353                 sb.bssid[5] = strtol(&bssid[12], NULL, 16);
1354                 sb.bssid[6] = strtol(&bssid[15], NULL, 16);
1355         }
1356 
1357         if (sb.bssid[0])
1358         {
1359                 sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
1360                         sb.bssid[1], sb.bssid[2], sb.bssid[3],
1361                         sb.bssid[4], sb.bssid[5], sb.bssid[6]);
1362 
1363                 return 0;
1364         }
1365 
1366         return -1;
1367 }
1368 
1369 
1370 static int nl80211_get_frequency_scan_cb(struct nl_msg *msg, void *arg)
1371 {
1372         int *freq = arg;
1373         struct nlattr **attr = nl80211_parse(msg);
1374         struct nlattr *binfo[NL80211_BSS_MAX + 1];
1375 
1376         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
1377                 [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
1378                 [NL80211_BSS_STATUS]    = { .type = NLA_U32 },
1379         };
1380 
1381         if (attr[NL80211_ATTR_BSS] &&
1382             !nla_parse_nested(binfo, NL80211_BSS_MAX,
1383                               attr[NL80211_ATTR_BSS], bss_policy))
1384         {
1385                 if (binfo[NL80211_BSS_STATUS] && binfo[NL80211_BSS_FREQUENCY])
1386                         *freq = nla_get_u32(binfo[NL80211_BSS_FREQUENCY]);
1387         }
1388 
1389         return NL_SKIP;
1390 }
1391 
1392 static int nl80211_get_frequency_info_cb(struct nl_msg *msg, void *arg)
1393 {
1394         int *freq = arg;
1395         struct nlattr **tb = nl80211_parse(msg);
1396 
1397         if (tb[NL80211_ATTR_WIPHY_FREQ])
1398                 *freq = nla_get_u32(tb[NL80211_ATTR_WIPHY_FREQ]);
1399 
1400         return NL_SKIP;
1401 }
1402 
1403 static int nl80211_get_frequency(const char *ifname, int *buf)
1404 {
1405         char *res, channel[4] = { 0 }, hwmode[3] = { 0 }, ax[2] = { 0 };
1406 
1407         /* try to find frequency from interface info */
1408         res = nl80211_phy2ifname(ifname);
1409         *buf = 0;
1410 
1411         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1412                         nl80211_get_frequency_info_cb, buf);
1413 
1414         /* failed, try to find frequency from hostapd info */
1415         if ((*buf == 0) &&
1416             nl80211_hostapd_query(ifname, "hw_mode", hwmode, sizeof(hwmode),
1417                                           "channel", channel, sizeof(channel),
1418                                           "ieee80211ax", ax, sizeof(ax)) >= 2)
1419         {
1420                 *buf = nl80211_channel2freq(atoi(channel), hwmode, ax[0] == '1');
1421         }
1422 
1423         /* failed, try to find frequency from scan results */
1424         if (*buf == 0)
1425         {
1426                 res = nl80211_phy2ifname(ifname);
1427 
1428                 nl80211_request(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
1429                                 nl80211_get_frequency_scan_cb, buf);
1430         }
1431 
1432         return (*buf == 0) ? -1 : 0;
1433 }
1434 
1435 static int nl80211_get_center_freq1_cb(struct nl_msg *msg, void *arg)
1436 {
1437         int *freq = arg;
1438         struct nlattr **tb = nl80211_parse(msg);
1439 
1440         if (tb[NL80211_ATTR_CENTER_FREQ1])
1441                 *freq = nla_get_u32(tb[NL80211_ATTR_CENTER_FREQ1]);
1442 
1443         return NL_SKIP;
1444 }
1445 
1446 static int nl80211_get_center_freq1(const char *ifname, int *buf)
1447 {
1448         char *res;
1449 
1450         /* try to find frequency from interface info */
1451         res = nl80211_phy2ifname(ifname);
1452         *buf = 0;
1453 
1454         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1455                         nl80211_get_center_freq1_cb, buf);
1456 
1457         return (*buf == 0) ? -1 : 0;
1458 }
1459 
1460 static int nl80211_get_center_freq2_cb(struct nl_msg *msg, void *arg)
1461 {
1462         int *freq = arg;
1463         struct nlattr **tb = nl80211_parse(msg);
1464 
1465         if (tb[NL80211_ATTR_CENTER_FREQ2])
1466                 *freq = nla_get_u32(tb[NL80211_ATTR_CENTER_FREQ2]);
1467 
1468         return NL_SKIP;
1469 }
1470 
1471 static int nl80211_get_center_freq2(const char *ifname, int *buf)
1472 {
1473         char *res;
1474 
1475         /* try to find frequency from interface info */
1476         res = nl80211_phy2ifname(ifname);
1477         *buf = 0;
1478 
1479         nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1480                         nl80211_get_center_freq2_cb, buf);
1481 
1482         return (*buf == 0) ? -1 : 0;
1483 }
1484 
1485 static int nl80211_get_channel(const char *ifname, int *buf)
1486 {
1487         if (!nl80211_get_frequency(ifname, buf))
1488         {
1489                 *buf = nl80211_freq2channel(*buf);
1490                 return 0;
1491         }
1492 
1493         return -1;
1494 }
1495 
1496 static int nl80211_get_center_chan1(const char *ifname, int *buf)
1497 {
1498         if (!nl80211_get_center_freq1(ifname, buf))
1499         {
1500                 *buf = nl80211_freq2channel(*buf);
1501                 return 0;
1502         }
1503 
1504         return -1;
1505 }
1506 
1507 static int nl80211_get_center_chan2(const char *ifname, int *buf)
1508 {
1509         if (!nl80211_get_center_freq2(ifname, buf))
1510         {
1511                 *buf = nl80211_freq2channel(*buf);
1512                 return 0;
1513         }
1514 
1515         return -1;
1516 }
1517 
1518 static int nl80211_get_txpower_cb(struct nl_msg *msg, void *arg)
1519 {
1520         int *buf = arg;
1521         struct nlattr **tb = nl80211_parse(msg);
1522 
1523         if (tb[NL80211_ATTR_WIPHY_TX_POWER_LEVEL])
1524                 *buf = iwinfo_mbm2dbm(nla_get_u32(tb[NL80211_ATTR_WIPHY_TX_POWER_LEVEL]));
1525 
1526         return NL_SKIP;
1527 }
1528 
1529 static int nl80211_get_txpower(const char *ifname, int *buf)
1530 {
1531         char *res;
1532 
1533         res = nl80211_phy2ifname(ifname);
1534         *buf = 0;
1535 
1536         if (nl80211_request(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0,
1537                             nl80211_get_txpower_cb, buf))
1538                 return -1;
1539 
1540         return 0;
1541 }
1542 
1543 
1544 static int nl80211_fill_signal_cb(struct nl_msg *msg, void *arg)
1545 {
1546         int8_t dbm;
1547         int16_t mbit;
1548         struct nl80211_rssi_rate *rr = arg;
1549         struct nlattr **attr = nl80211_parse(msg);
1550         struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
1551         struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
1552 
1553         static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
1554                 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32    },
1555                 [NL80211_STA_INFO_RX_BYTES]      = { .type = NLA_U32    },
1556                 [NL80211_STA_INFO_TX_BYTES]      = { .type = NLA_U32    },
1557                 [NL80211_STA_INFO_RX_PACKETS]    = { .type = NLA_U32    },
1558                 [NL80211_STA_INFO_TX_PACKETS]    = { .type = NLA_U32    },
1559                 [NL80211_STA_INFO_SIGNAL]        = { .type = NLA_U8     },
1560                 [NL80211_STA_INFO_TX_BITRATE]    = { .type = NLA_NESTED },
1561                 [NL80211_STA_INFO_LLID]          = { .type = NLA_U16    },
1562                 [NL80211_STA_INFO_PLID]          = { .type = NLA_U16    },
1563                 [NL80211_STA_INFO_PLINK_STATE]   = { .type = NLA_U8     },
1564         };
1565 
1566         static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
1567                 [NL80211_RATE_INFO_BITRATE]      = { .type = NLA_U16  },
1568                 [NL80211_RATE_INFO_MCS]          = { .type = NLA_U8   },
1569                 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG },
1570                 [NL80211_RATE_INFO_SHORT_GI]     = { .type = NLA_FLAG },
1571         };
1572 
1573         if (attr[NL80211_ATTR_STA_INFO])
1574         {
1575                 if (!nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
1576                                       attr[NL80211_ATTR_STA_INFO], stats_policy))
1577                 {
1578                         if (sinfo[NL80211_STA_INFO_SIGNAL])
1579                         {
1580                                 dbm = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
1581                                 rr->rssi = (rr->rssi * rr->rssi_samples + dbm) / (rr->rssi_samples + 1);
1582                                 rr->rssi_samples++;
1583                         }
1584 
1585                         if (sinfo[NL80211_STA_INFO_TX_BITRATE])
1586                         {
1587                                 if (!nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
1588                                                       sinfo[NL80211_STA_INFO_TX_BITRATE],
1589                                                       rate_policy))
1590                                 {
1591                                         if (rinfo[NL80211_RATE_INFO_BITRATE])
1592                                         {
1593                                                 mbit = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]);
1594                                                 rr->rate = (rr->rate * rr->rate_samples + mbit) / (rr->rate_samples + 1);
1595                                                 rr->rate_samples++;
1596                                         }
1597                                 }
1598                         }
1599                 }
1600         }
1601 
1602         return NL_SKIP;
1603 }
1604 
1605 static void nl80211_fill_signal(const char *ifname, struct nl80211_rssi_rate *r)
1606 {
1607         DIR *d;
1608         struct dirent *de;
1609 
1610         memset(r, 0, sizeof(*r));
1611 
1612         if ((d = opendir("/sys/class/net")) != NULL)
1613         {
1614                 while ((de = readdir(d)) != NULL)
1615                 {
1616                         if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
1617                             (!de->d_name[strlen(ifname)] ||
1618                              !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
1619                         {
1620                                 nl80211_request(de->d_name, NL80211_CMD_GET_STATION,
1621                                                 NLM_F_DUMP, nl80211_fill_signal_cb, r);
1622                         }
1623                 }
1624 
1625                 closedir(d);
1626         }
1627 }
1628 
1629 static int nl80211_get_bitrate(const char *ifname, int *buf)
1630 {
1631         struct nl80211_rssi_rate rr;
1632 
1633         nl80211_fill_signal(ifname, &rr);
1634 
1635         if (rr.rate_samples)
1636         {
1637                 *buf = (rr.rate * 100);
1638                 return 0;
1639         }
1640 
1641         return -1;
1642 }
1643 
1644 static int nl80211_get_signal(const char *ifname, int *buf)
1645 {
1646         struct nl80211_rssi_rate rr;
1647 
1648         nl80211_fill_signal(ifname, &rr);
1649 
1650         if (rr.rssi_samples)
1651         {
1652                 *buf = rr.rssi;
1653                 return 0;
1654         }
1655 
1656         return -1;
1657 }
1658 
1659 static int nl80211_get_noise_cb(struct nl_msg *msg, void *arg)
1660 {
1661         int8_t *noise = arg;
1662         struct nlattr **tb = nl80211_parse(msg);
1663         struct nlattr *si[NL80211_SURVEY_INFO_MAX + 1];
1664 
1665         static struct nla_policy sp[NL80211_SURVEY_INFO_MAX + 1] = {
1666                 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
1667                 [NL80211_SURVEY_INFO_NOISE]     = { .type = NLA_U8  },
1668         };
1669 
1670         if (!tb[NL80211_ATTR_SURVEY_INFO])
1671                 return NL_SKIP;
1672 
1673         if (nla_parse_nested(si, NL80211_SURVEY_INFO_MAX,
1674                              tb[NL80211_ATTR_SURVEY_INFO], sp))
1675                 return NL_SKIP;
1676 
1677         if (!si[NL80211_SURVEY_INFO_NOISE])
1678                 return NL_SKIP;
1679 
1680         if (!*noise || si[NL80211_SURVEY_INFO_IN_USE])
1681                 *noise = (int8_t)nla_get_u8(si[NL80211_SURVEY_INFO_NOISE]);
1682 
1683         return NL_SKIP;
1684 }
1685 
1686 
1687 static int nl80211_get_noise(const char *ifname, int *buf)
1688 {
1689         int8_t noise = 0;
1690 
1691         if (nl80211_request(ifname, NL80211_CMD_GET_SURVEY, NLM_F_DUMP,
1692                             nl80211_get_noise_cb, &noise))
1693                 goto out;
1694 
1695         *buf = noise;
1696         return 0;
1697 
1698 out:
1699         *buf = 0;
1700         return -1;
1701 }
1702 
1703 static int nl80211_get_quality(const char *ifname, int *buf)
1704 {
1705         int signal;
1706 
1707         if (!nl80211_get_signal(ifname, &signal))
1708         {
1709                 /* A positive signal level is usually just a quality
1710                  * value, pass through as-is */
1711                 if (signal >= 0)
1712                 {
1713                         *buf = signal;
1714                 }
1715 
1716                 /* The cfg80211 wext compat layer assumes a signal range
1717                  * of -110 dBm to -40 dBm, the quality value is derived
1718                  * by adding 110 to the signal level */
1719                 else
1720                 {
1721                         if (signal < -110)
1722                                 signal = -110;
1723                         else if (signal > -40)
1724                                 signal = -40;
1725 
1726                         *buf = (signal + 110);
1727                 }
1728 
1729                 return 0;
1730         }
1731 
1732         return -1;
1733 }
1734 
1735 static int nl80211_get_quality_max(const char *ifname, int *buf)
1736 {
1737         /* The cfg80211 wext compat layer assumes a maximum
1738          * quality of 70 */
1739         *buf = 70;
1740 
1741         return 0;
1742 }
1743 
1744 static int nl80211_check_wepkey(const char *key)
1745 {
1746         if (key && *key)
1747         {
1748                 switch (strlen(key))
1749                 {
1750                 case 5:
1751                 case 10:
1752                         return IWINFO_CIPHER_WEP40;
1753 
1754                 case 13:
1755                 case 26:
1756                         return IWINFO_CIPHER_WEP104;
1757                 }
1758         }
1759 
1760         return 0;
1761 }
1762 
1763 static struct {
1764         const char *match;
1765         int version;
1766         int suite;
1767 } wpa_key_mgmt_strings[] = {
1768         { "IEEE 802.1X/EAP", 0, IWINFO_KMGMT_8021x },
1769         { "EAP-SUITE-B-192", 4, IWINFO_KMGMT_8021x },
1770         { "EAP-SUITE-B",     4, IWINFO_KMGMT_8021x },
1771         { "EAP-SHA384",      4, IWINFO_KMGMT_8021x },
1772         { "EAP-SHA256",      0, IWINFO_KMGMT_8021x },
1773         { "PSK-SHA256",      0, IWINFO_KMGMT_PSK },
1774         { "NONE",            0, IWINFO_KMGMT_NONE },
1775         { "None",            0, IWINFO_KMGMT_NONE },
1776         { "PSK",             0, IWINFO_KMGMT_PSK },
1777         { "EAP",             0, IWINFO_KMGMT_8021x },
1778         { "SAE",             4, IWINFO_KMGMT_SAE },
1779         { "OWE",             4, IWINFO_KMGMT_OWE }
1780 };
1781 
1782 static void parse_wpa_suites(const char *str, int defversion,
1783                              uint8_t *versions, uint8_t *suites)
1784 {
1785         size_t l;
1786         int i, version;
1787         const char *p, *q, *m, *sep = " \t\n,-+/";
1788 
1789         for (p = str; *p; )
1790         {
1791                 q = p;
1792 
1793                 for (i = 0; i < ARRAY_SIZE(wpa_key_mgmt_strings); i++)
1794                 {
1795                         m = wpa_key_mgmt_strings[i].match;
1796                         l = strlen(m);
1797 
1798                         if (!strncmp(q, m, l) && (!q[l] || strchr(sep, q[l])))
1799                         {
1800                                 if (wpa_key_mgmt_strings[i].version != 0)
1801                                         version = wpa_key_mgmt_strings[i].version;
1802                                 else
1803                                         version = defversion;
1804 
1805                                 *versions |= version;
1806                                 *suites |= wpa_key_mgmt_strings[i].suite;
1807 
1808                                 q += l;
1809                                 break;
1810                         }
1811                 }
1812 
1813                 if (q == p)
1814                         q += strcspn(q, sep);
1815 
1816                 p = q + strspn(q, sep);
1817         }
1818 }
1819 
1820 static struct {
1821         const char *match;
1822         int cipher;
1823 } wpa_cipher_strings[] = {
1824         { "WEP-104", IWINFO_CIPHER_WEP104  },
1825         { "WEP-40",  IWINFO_CIPHER_WEP40   },
1826         { "NONE",    IWINFO_CIPHER_NONE    },
1827         { "TKIP",    IWINFO_CIPHER_TKIP    },
1828         { "CCMP-256",IWINFO_CIPHER_CCMP256 },
1829         { "CCMP",    IWINFO_CIPHER_CCMP    },
1830         { "GCMP-256",IWINFO_CIPHER_GCMP256 },
1831         { "GCMP",    IWINFO_CIPHER_GCMP    }
1832 };
1833 
1834 static void parse_wpa_ciphers(const char *str, uint16_t *ciphers)
1835 {
1836         int i;
1837         size_t l;
1838         const char *m, *p, *q, *sep = " \t\n,-+/";
1839 
1840         for (p = str; *p; )
1841         {
1842                 q = p;
1843 
1844                 for (i = 0; i < ARRAY_SIZE(wpa_cipher_strings); i++)
1845                 {
1846                         m = wpa_cipher_strings[i].match;
1847                         l = strlen(m);
1848 
1849                         if (!strncmp(q, m, l) && (!q[l] || strchr(sep, q[l])))
1850                         {
1851                                 *ciphers |= wpa_cipher_strings[i].cipher;
1852 
1853                                 q += l;
1854                                 break;
1855                         }
1856                 }
1857 
1858                 if (q == p)
1859                         q += strcspn(q, sep);
1860 
1861                 p = q + strspn(q, sep);
1862         }
1863 }
1864 
1865 static int nl80211_get_encryption(const char *ifname, char *buf)
1866 {
1867         char *p;
1868         int opmode;
1869         uint8_t wpa_version = 0;
1870         char wpa[2], wpa_key_mgmt[64], wpa_pairwise[16], wpa_groupwise[16];
1871         char auth_algs[2], wep_key0[27], wep_key1[27], wep_key2[27], wep_key3[27];
1872         char mode[16];
1873 
1874         struct iwinfo_crypto_entry *c = (struct iwinfo_crypto_entry *)buf;
1875 
1876         /* WPA supplicant */
1877         if (nl80211_wpactl_query(ifname,
1878                         "pairwise_cipher", wpa_pairwise,  sizeof(wpa_pairwise),
1879                         "group_cipher",    wpa_groupwise, sizeof(wpa_groupwise),
1880                         "key_mgmt",        wpa_key_mgmt,  sizeof(wpa_key_mgmt),
1881                         "mode",            mode,          sizeof(mode)))
1882         {
1883                 /* WEP or Open */
1884                 if (!strcmp(wpa_key_mgmt, "NONE"))
1885                 {
1886                         parse_wpa_ciphers(wpa_pairwise, &c->pair_ciphers);
1887                         parse_wpa_ciphers(wpa_groupwise, &c->group_ciphers);
1888 
1889                         if (c->pair_ciphers != 0 && c->pair_ciphers != IWINFO_CIPHER_NONE) {
1890                                 c->enabled     = 1;
1891                                 c->auth_suites = IWINFO_KMGMT_NONE;
1892                                 c->auth_algs   = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
1893                         }
1894                         else {
1895                                 c->pair_ciphers = 0;
1896                                 c->group_ciphers = 0;
1897                         }
1898                 }
1899 
1900                 /* MESH with SAE */
1901                 else if (!strcmp(mode, "mesh") && !strcmp(wpa_key_mgmt, "UNKNOWN"))
1902                 {
1903                         c->enabled = 1;
1904                         c->wpa_version = 4;
1905                         c->auth_suites = IWINFO_KMGMT_SAE;
1906                         c->pair_ciphers = IWINFO_CIPHER_CCMP;
1907                         c->group_ciphers = IWINFO_CIPHER_CCMP;
1908                 }
1909 
1910                 /* WPA */
1911                 else
1912                 {
1913                         parse_wpa_ciphers(wpa_pairwise, &c->pair_ciphers);
1914                         parse_wpa_ciphers(wpa_groupwise, &c->group_ciphers);
1915 
1916                         p = wpa_key_mgmt;
1917 
1918                         if (!strncmp(p, "WPA2-", 5) || !strncmp(p, "WPA2/", 5))
1919                         {
1920                                 p += 5;
1921                                 wpa_version = 2;
1922                         }
1923                         else if (!strncmp(p, "WPA-", 4))
1924                         {
1925                                 p += 4;
1926                                 wpa_version = 1;
1927                         }
1928 
1929                         parse_wpa_suites(p, wpa_version, &c->wpa_version, &c->auth_suites);
1930 
1931                         c->enabled = !!(c->wpa_version && c->auth_suites);
1932                 }
1933 
1934                 return 0;
1935         }
1936 
1937         /* Hostapd */
1938         else if (nl80211_hostapd_query(ifname,
1939                                 "wpa",          wpa,          sizeof(wpa),
1940                                 "wpa_key_mgmt", wpa_key_mgmt, sizeof(wpa_key_mgmt),
1941                                 "wpa_pairwise", wpa_pairwise, sizeof(wpa_pairwise),
1942                                 "auth_algs",    auth_algs,    sizeof(auth_algs),
1943                                 "wep_key0",     wep_key0,     sizeof(wep_key0),
1944                                 "wep_key1",     wep_key1,     sizeof(wep_key1),
1945                                 "wep_key2",     wep_key2,     sizeof(wep_key2),
1946                                 "wep_key3",     wep_key3,     sizeof(wep_key3)))
1947         {
1948                 c->wpa_version = 0;
1949 
1950                 if (wpa_key_mgmt[0])
1951                 {
1952                         for (p = strtok(wpa_key_mgmt, " \t"); p != NULL; p = strtok(NULL, " \t"))
1953                         {
1954                                 if (!strncmp(p, "WPA-", 4))
1955                                         p += 4;
1956 
1957                                 if (!strncmp(p, "FT-", 3))
1958                                         p += 3;
1959 
1960                                 parse_wpa_suites(p, atoi(wpa), &c->wpa_version, &c->auth_suites);
1961                         }
1962 
1963                         c->enabled = c->wpa_version ? 1 : 0;
1964                 }
1965 
1966                 if (wpa_pairwise[0])
1967                         parse_wpa_ciphers(wpa_pairwise, &c->pair_ciphers);
1968 
1969                 if (auth_algs[0])
1970                 {
1971                         switch (atoi(auth_algs))
1972                         {
1973                         case 1:
1974                                 c->auth_algs |= IWINFO_AUTH_OPEN;
1975                                 break;
1976 
1977                         case 2:
1978                                 c->auth_algs |= IWINFO_AUTH_SHARED;
1979                                 break;
1980 
1981                         case 3:
1982                                 c->auth_algs |= IWINFO_AUTH_OPEN;
1983                                 c->auth_algs |= IWINFO_AUTH_SHARED;
1984                                 break;
1985                         }
1986 
1987                         c->pair_ciphers |= nl80211_check_wepkey(wep_key0);
1988                         c->pair_ciphers |= nl80211_check_wepkey(wep_key1);
1989                         c->pair_ciphers |= nl80211_check_wepkey(wep_key2);
1990                         c->pair_ciphers |= nl80211_check_wepkey(wep_key3);
1991 
1992                         c->enabled = (c->auth_algs && c->pair_ciphers) ? 1 : 0;
1993                 }
1994 
1995                 c->group_ciphers = c->pair_ciphers;
1996 
1997                 return 0;
1998         }
1999 
2000         /* Ad-Hoc or Mesh interfaces without wpa_supplicant are open */
2001         else if (!nl80211_get_mode(ifname, &opmode) &&
2002                  (opmode == IWINFO_OPMODE_ADHOC ||
2003                   opmode == IWINFO_OPMODE_MESHPOINT))
2004         {
2005                 c->enabled = 0;
2006 
2007                 return 0;
2008         }
2009 
2010 
2011         return -1;
2012 }
2013 
2014 static int nl80211_get_phyname(const char *ifname, char *buf)
2015 {
2016         const char *name;
2017 
2018         name = nl80211_ifname2phy(ifname);
2019 
2020         if (name)
2021         {
2022                 strcpy(buf, name);
2023                 return 0;
2024         }
2025         else if ((name = nl80211_phy2ifname(ifname)) != NULL)
2026         {
2027                 name = nl80211_ifname2phy(name);
2028 
2029                 if (name)
2030                 {
2031                         strcpy(buf, ifname);
2032                         return 0;
2033                 }
2034         }
2035 
2036         return -1;
2037 }
2038 
2039 
2040 static void nl80211_parse_rateinfo(struct nlattr **ri,
2041                                    struct iwinfo_rate_entry *re)
2042 {
2043         if (ri[NL80211_RATE_INFO_BITRATE32])
2044                 re->rate = nla_get_u32(ri[NL80211_RATE_INFO_BITRATE32]) * 100;
2045         else if (ri[NL80211_RATE_INFO_BITRATE])
2046                 re->rate = nla_get_u16(ri[NL80211_RATE_INFO_BITRATE]) * 100;
2047 
2048         if (ri[NL80211_RATE_INFO_HE_MCS])
2049         {
2050                 re->is_he = 1;
2051                 re->mcs = nla_get_u8(ri[NL80211_RATE_INFO_HE_MCS]);
2052 
2053                 if (ri[NL80211_RATE_INFO_HE_NSS])
2054                         re->nss = nla_get_u8(ri[NL80211_RATE_INFO_HE_NSS]);
2055                 if (ri[NL80211_RATE_INFO_HE_GI])
2056                         re->he_gi = nla_get_u8(ri[NL80211_RATE_INFO_HE_GI]);
2057                 if (ri[NL80211_RATE_INFO_HE_DCM])
2058                         re->he_dcm = nla_get_u8(ri[NL80211_RATE_INFO_HE_DCM]);
2059         }
2060         else if (ri[NL80211_RATE_INFO_VHT_MCS])
2061         {
2062                 re->is_vht = 1;
2063                 re->mcs = nla_get_u8(ri[NL80211_RATE_INFO_VHT_MCS]);
2064 
2065                 if (ri[NL80211_RATE_INFO_VHT_NSS])
2066                         re->nss = nla_get_u8(ri[NL80211_RATE_INFO_VHT_NSS]);
2067         }
2068         else if (ri[NL80211_RATE_INFO_MCS])
2069         {
2070                 re->is_ht = 1;
2071                 re->mcs = nla_get_u8(ri[NL80211_RATE_INFO_MCS]);
2072         }
2073 
2074         if (ri[NL80211_RATE_INFO_5_MHZ_WIDTH])
2075                 re->mhz = 5;
2076         else if (ri[NL80211_RATE_INFO_10_MHZ_WIDTH])
2077                 re->mhz = 10;
2078         else if (ri[NL80211_RATE_INFO_40_MHZ_WIDTH])
2079                 re->mhz = 40;
2080         else if (ri[NL80211_RATE_INFO_80_MHZ_WIDTH])
2081                 re->mhz = 80;
2082         else if (ri[NL80211_RATE_INFO_80P80_MHZ_WIDTH] ||
2083                  ri[NL80211_RATE_INFO_160_MHZ_WIDTH])
2084                 re->mhz = 160;
2085         else
2086                 re->mhz = 20;
2087 
2088         if (ri[NL80211_RATE_INFO_SHORT_GI])
2089                 re->is_short_gi = 1;
2090 
2091         re->is_40mhz = (re->mhz == 40);
2092 }
2093 
2094 static int nl80211_get_survey_cb(struct nl_msg *msg, void *arg)
2095 {
2096         struct nl80211_array_buf *arr = arg;
2097         struct iwinfo_survey_entry *e = arr->buf;
2098         struct nlattr **attr = nl80211_parse(msg);
2099         struct nlattr *sinfo[NL80211_SURVEY_INFO_MAX + 1];
2100         int rc;
2101 
2102         static struct nla_policy survey_policy[NL80211_SURVEY_INFO_MAX + 1] = {
2103                 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
2104                 [NL80211_SURVEY_INFO_NOISE]  = { .type = NLA_U8     },
2105                 [NL80211_SURVEY_INFO_TIME] = { .type = NLA_U64   },
2106                 [NL80211_SURVEY_INFO_TIME_BUSY] = { .type = NLA_U64   },
2107                 [NL80211_SURVEY_INFO_TIME_EXT_BUSY] = { .type = NLA_U64   },
2108                 [NL80211_SURVEY_INFO_TIME_RX] = { .type = NLA_U64   },
2109                 [NL80211_SURVEY_INFO_TIME_TX] = { .type = NLA_U64   },
2110         };
2111 
2112         rc = nla_parse_nested(sinfo, NL80211_SURVEY_INFO_MAX,
2113                                 attr[NL80211_ATTR_SURVEY_INFO],
2114                                 survey_policy);
2115         if (rc)
2116                 return NL_SKIP;
2117 
2118         /* advance to end of array */
2119         e += arr->count;
2120         memset(e, 0, sizeof(*e));
2121 
2122         if (sinfo[NL80211_SURVEY_INFO_FREQUENCY])
2123                 e->mhz = nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]);
2124 
2125         if (sinfo[NL80211_SURVEY_INFO_NOISE])
2126                 e->noise = nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]);
2127 
2128         if (sinfo[NL80211_SURVEY_INFO_TIME])
2129                 e->active_time = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME]);
2130 
2131         if (sinfo[NL80211_SURVEY_INFO_TIME_BUSY])
2132                 e->busy_time = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_BUSY]);
2133 
2134         if (sinfo[NL80211_SURVEY_INFO_TIME_EXT_BUSY])
2135                 e->busy_time_ext = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_EXT_BUSY]);
2136 
2137         if (sinfo[NL80211_SURVEY_INFO_TIME_RX])
2138                 e->rxtime = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_RX]);
2139 
2140         if (sinfo[NL80211_SURVEY_INFO_TIME_TX])
2141                 e->txtime = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_TX]);
2142 
2143         arr->count++;
2144         return NL_SKIP;
2145 }
2146 
2147 
2148 static void plink_state_to_str(char *dst, unsigned state)
2149 {
2150         switch (state) {
2151         case NL80211_PLINK_LISTEN:
2152                 strcpy(dst, "LISTEN");
2153                 break;
2154         case NL80211_PLINK_OPN_SNT:
2155                 strcpy(dst, "OPN_SNT");
2156                 break;
2157         case NL80211_PLINK_OPN_RCVD:
2158                 strcpy(dst, "OPN_RCVD");
2159                 break;
2160         case NL80211_PLINK_CNF_RCVD:
2161                 strcpy(dst, "CNF_RCVD");
2162                 break;
2163         case NL80211_PLINK_ESTAB:
2164                 strcpy(dst, "ESTAB");
2165                 break;
2166         case NL80211_PLINK_HOLDING:
2167                 strcpy(dst, "HOLDING");
2168                 break;
2169         case NL80211_PLINK_BLOCKED:
2170                 strcpy(dst, "BLOCKED");
2171                 break;
2172         default:
2173                 strcpy(dst, "UNKNOWN");
2174                 break;
2175         }
2176 }
2177 
2178 static void power_mode_to_str(char *dst, struct nlattr *a)
2179 {
2180         enum nl80211_mesh_power_mode pm = nla_get_u32(a);
2181 
2182         switch (pm) {
2183         case NL80211_MESH_POWER_ACTIVE:
2184                 strcpy(dst, "ACTIVE");
2185                 break;
2186         case NL80211_MESH_POWER_LIGHT_SLEEP:
2187                 strcpy(dst, "LIGHT SLEEP");
2188                 break;
2189         case NL80211_MESH_POWER_DEEP_SLEEP:
2190                 strcpy(dst, "DEEP SLEEP");
2191                 break;
2192         default:
2193                 strcpy(dst, "UNKNOWN");
2194                 break;
2195         }
2196 }
2197 
2198 static int nl80211_get_assoclist_cb(struct nl_msg *msg, void *arg)
2199 {
2200         struct nl80211_array_buf *arr = arg;
2201         struct iwinfo_assoclist_entry *e = arr->buf;
2202         struct nlattr **attr = nl80211_parse(msg);
2203         struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
2204         struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
2205         struct nl80211_sta_flag_update *sta_flags;
2206 
2207         static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
2208                 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32    },
2209                 [NL80211_STA_INFO_RX_PACKETS]    = { .type = NLA_U32    },
2210                 [NL80211_STA_INFO_TX_PACKETS]    = { .type = NLA_U32    },
2211                 [NL80211_STA_INFO_RX_BITRATE]    = { .type = NLA_NESTED },
2212                 [NL80211_STA_INFO_TX_BITRATE]    = { .type = NLA_NESTED },
2213                 [NL80211_STA_INFO_SIGNAL]        = { .type = NLA_U8     },
2214                 [NL80211_STA_INFO_SIGNAL_AVG]    = { .type = NLA_U8     },
2215                 [NL80211_STA_INFO_RX_BYTES]      = { .type = NLA_U32    },
2216                 [NL80211_STA_INFO_TX_BYTES]      = { .type = NLA_U32    },
2217                 [NL80211_STA_INFO_TX_RETRIES]    = { .type = NLA_U32    },
2218                 [NL80211_STA_INFO_TX_FAILED]     = { .type = NLA_U32    },
2219                 [NL80211_STA_INFO_CONNECTED_TIME]= { .type = NLA_U32    },
2220                 [NL80211_STA_INFO_RX_DROP_MISC]  = { .type = NLA_U64    },
2221                 [NL80211_STA_INFO_T_OFFSET]      = { .type = NLA_U64    },
2222                 [NL80211_STA_INFO_STA_FLAGS] =
2223                         { .minlen = sizeof(struct nl80211_sta_flag_update) },
2224                 [NL80211_STA_INFO_EXPECTED_THROUGHPUT]   = { .type = NLA_U32    },
2225                 /* mesh */
2226                 [NL80211_STA_INFO_LLID]          = { .type = NLA_U16    },
2227                 [NL80211_STA_INFO_PLID]          = { .type = NLA_U16    },
2228                 [NL80211_STA_INFO_PLINK_STATE]   = { .type = NLA_U8     },
2229                 [NL80211_STA_INFO_LOCAL_PM]      = { .type = NLA_U32    },
2230                 [NL80211_STA_INFO_PEER_PM]       = { .type = NLA_U32    },
2231                 [NL80211_STA_INFO_NONPEER_PM]    = { .type = NLA_U32    },
2232         };
2233 
2234         static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
2235                 [NL80211_RATE_INFO_BITRATE]      = { .type = NLA_U16    },
2236                 [NL80211_RATE_INFO_MCS]          = { .type = NLA_U8     },
2237                 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG   },
2238                 [NL80211_RATE_INFO_SHORT_GI]     = { .type = NLA_FLAG   },
2239         };
2240 
2241         /* advance to end of array */
2242         e += arr->count;
2243         memset(e, 0, sizeof(*e));
2244 
2245         if (attr[NL80211_ATTR_MAC])
2246                 memcpy(e->mac, nla_data(attr[NL80211_ATTR_MAC]), 6);
2247 
2248         if (attr[NL80211_ATTR_STA_INFO] &&
2249             !nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
2250                               attr[NL80211_ATTR_STA_INFO], stats_policy))
2251         {
2252                 if (sinfo[NL80211_STA_INFO_SIGNAL])
2253                         e->signal = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
2254 
2255                 if (sinfo[NL80211_STA_INFO_SIGNAL_AVG])
2256                         e->signal_avg = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL_AVG]);
2257 
2258                 if (sinfo[NL80211_STA_INFO_INACTIVE_TIME])
2259                         e->inactive = nla_get_u32(sinfo[NL80211_STA_INFO_INACTIVE_TIME]);
2260 
2261                 if (sinfo[NL80211_STA_INFO_CONNECTED_TIME])
2262                         e->connected_time = nla_get_u32(sinfo[NL80211_STA_INFO_CONNECTED_TIME]);
2263 
2264                 if (sinfo[NL80211_STA_INFO_RX_PACKETS])
2265                         e->rx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_RX_PACKETS]);
2266 
2267                 if (sinfo[NL80211_STA_INFO_TX_PACKETS])
2268                         e->tx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_TX_PACKETS]);
2269 
2270                 if (sinfo[NL80211_STA_INFO_RX_BITRATE] &&
2271                     !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
2272                                       sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy))
2273                         nl80211_parse_rateinfo(rinfo, &e->rx_rate);
2274 
2275                 if (sinfo[NL80211_STA_INFO_TX_BITRATE] &&
2276                     !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
2277                                       sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy))
2278                         nl80211_parse_rateinfo(rinfo, &e->tx_rate);
2279 
2280                 if (sinfo[NL80211_STA_INFO_RX_BYTES])
2281                         e->rx_bytes = nla_get_u32(sinfo[NL80211_STA_INFO_RX_BYTES]);
2282 
2283                 if (sinfo[NL80211_STA_INFO_TX_BYTES])
2284                         e->tx_bytes = nla_get_u32(sinfo[NL80211_STA_INFO_TX_BYTES]);
2285 
2286                 if (sinfo[NL80211_STA_INFO_TX_RETRIES])
2287                         e->tx_retries = nla_get_u32(sinfo[NL80211_STA_INFO_TX_RETRIES]);
2288 
2289                 if (sinfo[NL80211_STA_INFO_TX_FAILED])
2290                         e->tx_failed = nla_get_u32(sinfo[NL80211_STA_INFO_TX_FAILED]);
2291 
2292                 if (sinfo[NL80211_STA_INFO_T_OFFSET])
2293                         e->t_offset = nla_get_u64(sinfo[NL80211_STA_INFO_T_OFFSET]);
2294 
2295                 if (sinfo[NL80211_STA_INFO_RX_DROP_MISC])
2296                         e->rx_drop_misc = nla_get_u64(sinfo[NL80211_STA_INFO_RX_DROP_MISC]);
2297 
2298                 if (sinfo[NL80211_STA_INFO_EXPECTED_THROUGHPUT])
2299                         e->thr = nla_get_u32(sinfo[NL80211_STA_INFO_EXPECTED_THROUGHPUT]);
2300 
2301                 /* mesh */
2302                 if (sinfo[NL80211_STA_INFO_LLID])
2303                         e->llid = nla_get_u16(sinfo[NL80211_STA_INFO_LLID]);
2304 
2305                 if (sinfo[NL80211_STA_INFO_PLID])
2306                         e->plid = nla_get_u16(sinfo[NL80211_STA_INFO_PLID]);
2307 
2308                 if (sinfo[NL80211_STA_INFO_PLINK_STATE])
2309                         plink_state_to_str(e->plink_state,
2310                                 nla_get_u8(sinfo[NL80211_STA_INFO_PLINK_STATE]));
2311 
2312                 if (sinfo[NL80211_STA_INFO_LOCAL_PM])
2313                         power_mode_to_str(e->local_ps, sinfo[NL80211_STA_INFO_LOCAL_PM]);
2314                 if (sinfo[NL80211_STA_INFO_PEER_PM])
2315                         power_mode_to_str(e->peer_ps, sinfo[NL80211_STA_INFO_PEER_PM]);
2316                 if (sinfo[NL80211_STA_INFO_NONPEER_PM])
2317                         power_mode_to_str(e->nonpeer_ps, sinfo[NL80211_STA_INFO_NONPEER_PM]);
2318 
2319                 /* Station flags */
2320                 if (sinfo[NL80211_STA_INFO_STA_FLAGS])
2321                 {
2322                         sta_flags = (struct nl80211_sta_flag_update *)
2323                                 nla_data(sinfo[NL80211_STA_INFO_STA_FLAGS]);
2324 
2325                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_AUTHORIZED) &&
2326                             sta_flags->set & BIT(NL80211_STA_FLAG_AUTHORIZED))
2327                                 e->is_authorized = 1;
2328 
2329                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_AUTHENTICATED) &&
2330                             sta_flags->set & BIT(NL80211_STA_FLAG_AUTHENTICATED))
2331                                 e->is_authenticated = 1;
2332 
2333                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) &&
2334                             sta_flags->set & BIT(NL80211_STA_FLAG_SHORT_PREAMBLE))
2335                                 e->is_preamble_short = 1;
2336 
2337                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_WME) &&
2338                             sta_flags->set & BIT(NL80211_STA_FLAG_WME))
2339                                 e->is_wme = 1;
2340 
2341                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_MFP) &&
2342                             sta_flags->set & BIT(NL80211_STA_FLAG_MFP))
2343                                 e->is_mfp = 1;
2344 
2345                         if (sta_flags->mask & BIT(NL80211_STA_FLAG_TDLS_PEER) &&
2346                             sta_flags->set & BIT(NL80211_STA_FLAG_TDLS_PEER))
2347                                 e->is_tdls = 1;
2348                 }
2349         }
2350 
2351         e->noise = 0; /* filled in by caller */
2352         arr->count++;
2353 
2354         return NL_SKIP;
2355 }
2356 
2357 static int nl80211_get_survey(const char *ifname, char *buf, int *len)
2358 {
2359         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
2360         int rc;
2361 
2362         rc = nl80211_request(ifname, NL80211_CMD_GET_SURVEY,
2363                         NLM_F_DUMP, nl80211_get_survey_cb, &arr);
2364         if (!rc)
2365                 *len = (arr.count * sizeof(struct iwinfo_survey_entry));
2366         else
2367                 *len = 0;
2368 
2369         return 0;
2370 }
2371 
2372 static int nl80211_get_assoclist(const char *ifname, char *buf, int *len)
2373 {
2374         DIR *d;
2375         int i, noise = 0;
2376         struct dirent *de;
2377         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
2378         struct iwinfo_assoclist_entry *e;
2379 
2380         if ((d = opendir("/sys/class/net")) != NULL)
2381         {
2382                 while ((de = readdir(d)) != NULL)
2383                 {
2384                         if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
2385                             (!de->d_name[strlen(ifname)] ||
2386                              !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
2387                         {
2388                                 nl80211_request(de->d_name, NL80211_CMD_GET_STATION,
2389                                                 NLM_F_DUMP, nl80211_get_assoclist_cb, &arr);
2390                         }
2391                 }
2392 
2393                 closedir(d);
2394 
2395                 if (!nl80211_get_noise(ifname, &noise))
2396                         for (i = 0, e = arr.buf; i < arr.count; i++, e++)
2397                                 e->noise = noise;
2398 
2399                 *len = (arr.count * sizeof(struct iwinfo_assoclist_entry));
2400                 return 0;
2401         }
2402 
2403         return -1;
2404 }
2405 
2406 static int nl80211_get_txpwrlist_cb(struct nl_msg *msg, void *arg)
2407 {
2408         int *dbm_max = arg;
2409         int ch_cur, ch_cmp, bands_remain, freqs_remain;
2410 
2411         struct nlattr **attr = nl80211_parse(msg);
2412         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
2413         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
2414         struct nlattr *band, *freq;
2415 
2416         static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
2417                 [NL80211_FREQUENCY_ATTR_FREQ]         = { .type = NLA_U32  },
2418                 [NL80211_FREQUENCY_ATTR_DISABLED]     = { .type = NLA_FLAG },
2419                 [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
2420                 [NL80211_FREQUENCY_ATTR_NO_IBSS]      = { .type = NLA_FLAG },
2421                 [NL80211_FREQUENCY_ATTR_RADAR]        = { .type = NLA_FLAG },
2422                 [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32  },
2423         };
2424 
2425         ch_cur = *dbm_max; /* value int* is initialized with channel by caller */
2426         *dbm_max = -1;
2427 
2428         nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
2429         {
2430                 nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
2431                           nla_len(band), NULL);
2432 
2433                 nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
2434                 {
2435                         nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
2436                                   nla_data(freq), nla_len(freq), freq_policy);
2437 
2438                         ch_cmp = nl80211_freq2channel(nla_get_u32(
2439                                 freqs[NL80211_FREQUENCY_ATTR_FREQ]));
2440 
2441                         if ((!ch_cur || (ch_cmp == ch_cur)) &&
2442                             freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER])
2443                         {
2444                                 *dbm_max = (int)(0.01 * nla_get_u32(
2445                                         freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]));
2446 
2447                                 break;
2448                         }
2449                 }
2450         }
2451 
2452         return NL_SKIP;
2453 }
2454 
2455 static int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len)
2456 {
2457         int err, ch_cur;
2458         int dbm_max = -1, dbm_cur, dbm_cnt;
2459         struct iwinfo_txpwrlist_entry entry;
2460 
2461         if (nl80211_get_channel(ifname, &ch_cur))
2462                 ch_cur = 0;
2463 
2464         /* initialize the value pointer with channel for callback */
2465         dbm_max = ch_cur;
2466 
2467         err = nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
2468                               nl80211_get_txpwrlist_cb, &dbm_max);
2469 
2470         if (!err)
2471         {
2472                 for (dbm_cur = 0, dbm_cnt = 0;
2473                      dbm_cur < dbm_max;
2474                      dbm_cur++, dbm_cnt++)
2475                 {
2476                         entry.dbm = dbm_cur;
2477                         entry.mw  = iwinfo_dbm2mw(dbm_cur);
2478 
2479                         memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
2480                 }
2481 
2482                 entry.dbm = dbm_max;
2483                 entry.mw  = iwinfo_dbm2mw(dbm_max);
2484 
2485                 memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
2486                 dbm_cnt++;
2487 
2488                 *len = dbm_cnt * sizeof(entry);
2489                 return 0;
2490         }
2491 
2492         return -1;
2493 }
2494 
2495 static void nl80211_get_scancrypto(char *spec, struct iwinfo_crypto_entry *c)
2496 {
2497         int wpa_version = 0;
2498         char *p, *q, *proto, *suites;
2499 
2500         c->enabled = 0;
2501 
2502         for (p = strtok_r(spec, "[]", &q); p; p = strtok_r(NULL, "[]", &q)) {
2503                 if (!strcmp(p, "WEP")) {
2504                         c->enabled      = 1;
2505                         c->auth_suites  = IWINFO_KMGMT_NONE;
2506                         c->auth_algs    = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
2507                         c->pair_ciphers = IWINFO_CIPHER_WEP40 | IWINFO_CIPHER_WEP104;
2508                         break;
2509                 }
2510 
2511                 proto = strtok(p, "-");
2512                 suites = strtok(NULL, "]");
2513 
2514                 if (!proto || !suites)
2515                         continue;
2516 
2517                 if (!strcmp(proto, "WPA2") || !strcmp(proto, "RSN"))
2518                         wpa_version = 2;
2519                 else if (!strcmp(proto, "WPA"))
2520                         wpa_version = 1;
2521                 else
2522                         continue;
2523 
2524                 c->enabled = 1;
2525 
2526                 parse_wpa_suites(suites, wpa_version, &c->wpa_version, &c->auth_suites);
2527                 parse_wpa_ciphers(suites, &c->pair_ciphers);
2528         }
2529 }
2530 
2531 
2532 struct nl80211_scanlist {
2533         struct iwinfo_scanlist_entry *e;
2534         int len;
2535 };
2536 
2537 
2538 static void nl80211_get_scanlist_ie(struct nlattr **bss,
2539                                     struct iwinfo_scanlist_entry *e)
2540 {
2541         int ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
2542         unsigned char *ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
2543         static unsigned char ms_oui[3] = { 0x00, 0x50, 0xf2 };
2544         int len;
2545 
2546         while (ielen >= 2 && ielen >= ie[1])
2547         {
2548                 switch (ie[0])
2549                 {
2550                 case 0: /* SSID */
2551                 case 114: /* Mesh ID */
2552                         if (e->ssid[0] == 0) {
2553                                 len = min(ie[1], IWINFO_ESSID_MAX_SIZE);
2554                                 memcpy(e->ssid, ie + 2, len);
2555                                 e->ssid[len] = 0;
2556                         }
2557                         break;
2558 
2559                 case 48: /* RSN */
2560                         iwinfo_parse_rsn(&e->crypto, ie + 2, ie[1],
2561                                          IWINFO_CIPHER_CCMP, IWINFO_KMGMT_8021x);
2562                         break;
2563 
2564                 case 221: /* Vendor */
2565                         if (ie[1] >= 4 && !memcmp(ie + 2, ms_oui, 3) && ie[5] == 1)
2566                                 iwinfo_parse_rsn(&e->crypto, ie + 6, ie[1] - 4,
2567                                                  IWINFO_CIPHER_TKIP, IWINFO_KMGMT_PSK);
2568                         break;
2569                 case 61: /* HT operation */
2570                         if (ie[1] >= 3) {
2571                                 e->ht_chan_info.primary_chan = ie[2];
2572                                 e->ht_chan_info.secondary_chan_off = ie[3] & 0x3;
2573                                 e->ht_chan_info.chan_width = (ie[4] & 0x4)>>2;
2574                         }
2575                         break;
2576                 case 192: /* VHT operation */
2577                         if (ie[1] >= 3) {
2578                                 e->vht_chan_info.chan_width = ie[2];
2579                                 e->vht_chan_info.center_chan_1 = ie[3];
2580                                 e->vht_chan_info.center_chan_2 = ie[4];
2581                         }
2582                         break;
2583                 }
2584 
2585                 ielen -= ie[1] + 2;
2586                 ie += ie[1] + 2;
2587         }
2588 }
2589 
2590 static int nl80211_get_scanlist_cb(struct nl_msg *msg, void *arg)
2591 {
2592         int8_t rssi;
2593         uint16_t caps;
2594 
2595         struct nl80211_scanlist *sl = arg;
2596         struct nlattr **tb = nl80211_parse(msg);
2597         struct nlattr *bss[NL80211_BSS_MAX + 1];
2598 
2599         static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
2600                 [NL80211_BSS_TSF]                  = { .type = NLA_U64 },
2601                 [NL80211_BSS_FREQUENCY]            = { .type = NLA_U32 },
2602                 [NL80211_BSS_BSSID]                = { 0 },
2603                 [NL80211_BSS_BEACON_INTERVAL]      = { .type = NLA_U16 },
2604                 [NL80211_BSS_CAPABILITY]           = { .type = NLA_U16 },
2605                 [NL80211_BSS_INFORMATION_ELEMENTS] = { 0 },
2606                 [NL80211_BSS_SIGNAL_MBM]           = { .type = NLA_U32 },
2607                 [NL80211_BSS_SIGNAL_UNSPEC]        = { .type = NLA_U8  },
2608                 [NL80211_BSS_STATUS]               = { .type = NLA_U32 },
2609                 [NL80211_BSS_SEEN_MS_AGO]          = { .type = NLA_U32 },
2610                 [NL80211_BSS_BEACON_IES]           = { 0 },
2611         };
2612 
2613         if (!tb[NL80211_ATTR_BSS] ||
2614                 nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
2615                                  bss_policy) ||
2616                 !bss[NL80211_BSS_BSSID])
2617         {
2618                 return NL_SKIP;
2619         }
2620 
2621         if (bss[NL80211_BSS_CAPABILITY])
2622                 caps = nla_get_u16(bss[NL80211_BSS_CAPABILITY]);
2623         else
2624                 caps = 0;
2625 
2626         memset(sl->e, 0, sizeof(*sl->e));
2627         memcpy(sl->e->mac, nla_data(bss[NL80211_BSS_BSSID]), 6);
2628 
2629         if (caps & (1<<1))
2630                 sl->e->mode = IWINFO_OPMODE_ADHOC;
2631         else if (caps & (1<<0))
2632                 sl->e->mode = IWINFO_OPMODE_MASTER;
2633         else
2634                 sl->e->mode = IWINFO_OPMODE_MESHPOINT;
2635 
2636         if (caps & (1<<4))
2637                 sl->e->crypto.enabled = 1;
2638 
2639         if (bss[NL80211_BSS_FREQUENCY])
2640         {
2641                 sl->e->mhz = nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
2642                 sl->e->band = nl80211_freq2band(sl->e->mhz);
2643                 sl->e->channel = nl80211_freq2channel(sl->e->mhz);
2644         }
2645 
2646         if (bss[NL80211_BSS_INFORMATION_ELEMENTS])
2647                 nl80211_get_scanlist_ie(bss, sl->e);
2648 
2649         if (bss[NL80211_BSS_SIGNAL_MBM])
2650         {
2651                 sl->e->signal =
2652                         (uint8_t)((int32_t)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100);
2653 
2654                 rssi = sl->e->signal - 0x100;
2655 
2656                 if (rssi < -110)
2657                         rssi = -110;
2658                 else if (rssi > -40)
2659                         rssi = -40;
2660 
2661                 sl->e->quality = (rssi + 110);
2662                 sl->e->quality_max = 70;
2663         }
2664 
2665         if (sl->e->crypto.enabled && !sl->e->crypto.wpa_version)
2666         {
2667                 sl->e->crypto.auth_algs    = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
2668                 sl->e->crypto.pair_ciphers = IWINFO_CIPHER_WEP40 | IWINFO_CIPHER_WEP104;
2669         }
2670 
2671         sl->e++;
2672         sl->len++;
2673 
2674         return NL_SKIP;
2675 }
2676 
2677 static int nl80211_get_scanlist_nl(const char *ifname, char *buf, int *len)
2678 {
2679         struct nl80211_scanlist sl = { .e = (struct iwinfo_scanlist_entry *)buf };
2680 
2681         if (nl80211_request(ifname, NL80211_CMD_TRIGGER_SCAN, 0, NULL, NULL))
2682                 goto out;
2683 
2684         if (nl80211_wait("nl80211", "scan",
2685                          NL80211_CMD_NEW_SCAN_RESULTS, NL80211_CMD_SCAN_ABORTED))
2686                 goto out;
2687 
2688         if (nl80211_request(ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP,
2689                             nl80211_get_scanlist_cb, &sl))
2690                 goto out;
2691 
2692         *len = sl.len * sizeof(struct iwinfo_scanlist_entry);
2693         return 0;
2694 
2695 out:
2696         *len = 0;
2697         return -1;
2698 }
2699 
2700 static int wpasupp_ssid_decode(const char *in, char *out, int outlen)
2701 {
2702 #define hex(x) \
2703         (((x) >= 'a') ? ((x) - 'a' + 10) : \
2704                 (((x) >= 'A') ? ((x) - 'A' + 10) : ((x) - '')))
2705 
2706         int len = 0;
2707 
2708         while (*in)
2709         {
2710                 if (len + 1 >= outlen)
2711                         break;
2712 
2713                 switch (*in)
2714                 {
2715                 case '\\':
2716                         in++;
2717                         switch (*in)
2718                         {
2719                         case 'n':
2720                                 out[len++] = '\n'; in++;
2721                                 break;
2722 
2723                         case 'r':
2724                                 out[len++] = '\r'; in++;
2725                                 break;
2726 
2727                         case 't':
2728                                 out[len++] = '\t'; in++;
2729                                 break;
2730 
2731                         case 'e':
2732                                 out[len++] = '\033'; in++;
2733                                 break;
2734 
2735                         case 'x':
2736                                 if (isxdigit(*(in+1)) && isxdigit(*(in+2)))
2737                                         out[len++] = hex(*(in+1)) * 16 + hex(*(in+2));
2738                                 in += 3;
2739                                 break;
2740 
2741                         default:
2742                                 out[len++] = *in++;
2743                                 break;
2744                         }
2745                         break;
2746 
2747                 default:
2748                         out[len++] = *in++;
2749                         break;
2750                 }
2751         }
2752 
2753         if (outlen > len)
2754                 out[len] = '\0';
2755 
2756         return len;
2757 }
2758 
2759 static int nl80211_get_scanlist_wpactl(const char *ifname, char *buf, int *len)
2760 {
2761         int sock, qmax, rssi, tries, count = -1, ready = 0;
2762         char *pos, *line, *bssid, *freq, *signal, *flags, *ssid, reply[4096];
2763         struct sockaddr_un local = { 0 };
2764         struct iwinfo_scanlist_entry *e = (struct iwinfo_scanlist_entry *)buf;
2765 
2766         sock = nl80211_wpactl_connect(ifname, &local);
2767 
2768         if (sock < 0)
2769                 return sock;
2770 
2771         send(sock, "ATTACH", 6, 0);
2772         send(sock, "SCAN", 4, 0);
2773 
2774         /*
2775          * wait for scan results:
2776          *   nl80211_wpactl_recv() will use a timeout of 256ms and we need to scan
2777          *   72 channels at most. We'll also receive two "OK" messages acknowledging
2778          *   the "ATTACH" and "SCAN" commands and the driver might need a bit extra
2779          *   time to process the results, so try 72 + 2 + 1 times.
2780          */
2781         for (tries = 0; tries < 75; tries++)
2782         {
2783                 if (nl80211_wpactl_recv(sock, reply, sizeof(reply)) <= 0)
2784                         continue;
2785 
2786                 /* got an event notification */
2787                 if (reply[0] == '<')
2788                 {
2789                         /* scan results are ready */
2790                         if (strstr(reply, "CTRL-EVENT-SCAN-RESULTS"))
2791                         {
2792                                 /* send "SCAN_RESULTS" command */
2793                                 ready = (send(sock, "SCAN_RESULTS", 12, 0) == 12);
2794                                 break;
2795                         }
2796 
2797                         /* is another unrelated event, retry */
2798                         tries--;
2799                 }
2800 
2801                 /* scanning already in progress, keep awaiting results */
2802                 else if (!strcmp(reply, "FAIL-BUSY\n"))
2803                 {
2804                         tries--;
2805                 }
2806 
2807                 /* another failure, abort */
2808                 else if (!strncmp(reply, "FAIL-", 5))
2809                 {
2810                         break;
2811                 }
2812         }
2813 
2814         /* receive and parse scan results if the wait above didn't time out */
2815         while (ready && nl80211_wpactl_recv(sock, reply, sizeof(reply)) > 0)
2816         {
2817                 /* received an event notification, receive again */
2818                 if (reply[0] == '<')
2819                         continue;
2820 
2821                 nl80211_get_quality_max(ifname, &qmax);
2822 
2823                 for (line = strtok_r(reply, "\n", &pos);
2824                      line != NULL;
2825                      line = strtok_r(NULL, "\n", &pos))
2826                 {
2827                         /* skip header line */
2828                         if (count < 0)
2829                         {
2830                                 count++;
2831                                 continue;
2832                         }
2833 
2834                         bssid  = strtok(line, "\t");
2835                         freq   = strtok(NULL, "\t");
2836                         signal = strtok(NULL, "\t");
2837                         flags  = strtok(NULL, "\t");
2838                         ssid   = strtok(NULL, "\n");
2839 
2840                         if (!bssid || !freq || !signal || !flags)
2841                                 continue;
2842 
2843                         /* BSSID */
2844                         e->mac[0] = strtol(&bssid[0],  NULL, 16);
2845                         e->mac[1] = strtol(&bssid[3],  NULL, 16);
2846                         e->mac[2] = strtol(&bssid[6],  NULL, 16);
2847                         e->mac[3] = strtol(&bssid[9],  NULL, 16);
2848                         e->mac[4] = strtol(&bssid[12], NULL, 16);
2849                         e->mac[5] = strtol(&bssid[15], NULL, 16);
2850 
2851                         /* SSID */
2852                         if (ssid)
2853                                 wpasupp_ssid_decode(ssid, e->ssid, sizeof(e->ssid));
2854                         else
2855                                 e->ssid[0] = 0;
2856 
2857                         /* Mode */
2858                         if (strstr(flags, "[MESH]"))
2859                                 e->mode = IWINFO_OPMODE_MESHPOINT;
2860                         else if (strstr(flags, "[IBSS]"))
2861                                 e->mode = IWINFO_OPMODE_ADHOC;
2862                         else
2863                                 e->mode = IWINFO_OPMODE_MASTER;
2864 
2865                         /* Channel */
2866                         e->mhz = atoi(freq);
2867                         e->band = nl80211_freq2band(e->mhz);
2868                         e->channel = nl80211_freq2channel(e->mhz);
2869 
2870                         /* Signal */
2871                         rssi = atoi(signal);
2872                         e->signal = rssi;
2873 
2874                         /* Quality */
2875                         if (rssi < 0)
2876                         {
2877                                 /* The cfg80211 wext compat layer assumes a signal range
2878                                  * of -110 dBm to -40 dBm, the quality value is derived
2879                                  * by adding 110 to the signal level */
2880                                 if (rssi < -110)
2881                                         rssi = -110;
2882                                 else if (rssi > -40)
2883                                         rssi = -40;
2884 
2885                                 e->quality = (rssi + 110);
2886                         }
2887                         else
2888                         {
2889                                 e->quality = rssi;
2890                         }
2891 
2892                         /* Max. Quality */
2893                         e->quality_max = qmax;
2894 
2895                         /* Crypto */
2896                         nl80211_get_scancrypto(flags, &e->crypto);
2897 
2898                         count++;
2899                         e++;
2900                 }
2901 
2902                 *len = count * sizeof(struct iwinfo_scanlist_entry);
2903                 break;
2904         }
2905 
2906         close(sock);
2907         unlink(local.sun_path);
2908 
2909         return (count >= 0) ? 0 : -1;
2910 }
2911 
2912 static int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
2913 {
2914         char *res;
2915         int rv, mode;
2916 
2917         *len = 0;
2918 
2919         /* Got a radioX pseudo interface, find some interface on it or create one */
2920         if (!strncmp(ifname, "radio", 5))
2921         {
2922                 /* Reuse existing interface */
2923                 if ((res = nl80211_phy2ifname(ifname)) != NULL)
2924                 {
2925                         return nl80211_get_scanlist(res, buf, len);
2926                 }
2927 
2928                 /* Need to spawn a temporary iface for scanning */
2929                 else if ((res = nl80211_ifadd(ifname)) != NULL)
2930                 {
2931                         rv = nl80211_get_scanlist(res, buf, len);
2932                         nl80211_ifdel(res);
2933                         return rv;
2934                 }
2935         }
2936 
2937         /* WPA supplicant */
2938         if (!nl80211_get_scanlist_wpactl(ifname, buf, len))
2939         {
2940                 return 0;
2941         }
2942 
2943         /* station / ad-hoc / monitor scan */
2944         else if (!nl80211_get_mode(ifname, &mode) &&
2945                  (mode == IWINFO_OPMODE_ADHOC ||
2946                   mode == IWINFO_OPMODE_MASTER ||
2947                   mode == IWINFO_OPMODE_CLIENT ||
2948                   mode == IWINFO_OPMODE_MONITOR) &&
2949                  iwinfo_ifup(ifname))
2950         {
2951                 return nl80211_get_scanlist_nl(ifname, buf, len);
2952         }
2953 
2954         /* AP scan */
2955         else
2956         {
2957                 /* Got a temp interface, don't create yet another one */
2958                 if (!strncmp(ifname, "tmp.", 4))
2959                 {
2960                         if (!iwinfo_ifup(ifname))
2961                                 return -1;
2962 
2963                         rv = nl80211_get_scanlist_nl(ifname, buf, len);
2964                         iwinfo_ifdown(ifname);
2965                         return rv;
2966                 }
2967 
2968                 /* Spawn a new scan interface */
2969                 else
2970                 {
2971                         if (!(res = nl80211_ifadd(ifname)))
2972                                 return -1;
2973 
2974                         iwinfo_ifmac(res);
2975 
2976                         /* if we can take the new interface up, the driver supports an
2977                          * additional interface and there's no need to tear down the ap */
2978                         if (iwinfo_ifup(res))
2979                         {
2980                                 rv = nl80211_get_scanlist_nl(res, buf, len);
2981                                 iwinfo_ifdown(res);
2982                         }
2983 
2984                         /* driver cannot create secondary interface, take down ap
2985                          * during scan */
2986                         else if (iwinfo_ifdown(ifname) && iwinfo_ifup(res))
2987                         {
2988                                 rv = nl80211_get_scanlist_nl(res, buf, len);
2989                                 iwinfo_ifdown(res);
2990                                 iwinfo_ifup(ifname);
2991                                 nl80211_hostapd_hup(ifname);
2992                         }
2993                         else
2994                                 rv = -1;
2995 
2996                         nl80211_ifdel(res);
2997                         return rv;
2998                 }
2999         }
3000 
3001         return -1;
3002 }
3003 
3004 static int nl80211_get_freqlist_cb(struct nl_msg *msg, void *arg)
3005 {
3006         int bands_remain, freqs_remain;
3007 
3008         struct nl80211_array_buf *arr = arg;
3009         struct iwinfo_freqlist_entry *e;
3010 
3011         struct nlattr **attr = nl80211_parse(msg);
3012         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
3013         struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
3014         struct nlattr *band, *freq;
3015 
3016         e = arr->buf;
3017         e += arr->count;
3018 
3019         if (attr[NL80211_ATTR_WIPHY_BANDS]) {
3020                 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
3021                 {
3022                         nla_parse(bands, NL80211_BAND_ATTR_MAX,
3023                                   nla_data(band), nla_len(band), NULL);
3024 
3025                         if (bands[NL80211_BAND_ATTR_FREQS]) {
3026                                 nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
3027                                 {
3028                                         nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
3029                                                   nla_data(freq), nla_len(freq), NULL);
3030 
3031                                         if (!freqs[NL80211_FREQUENCY_ATTR_FREQ] ||
3032                                             freqs[NL80211_FREQUENCY_ATTR_DISABLED])
3033                                                 continue;
3034 
3035                                         e->band = nl80211_get_band(band->nla_type);
3036                                         e->mhz = nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]);
3037                                         e->channel = nl80211_freq2channel(e->mhz);
3038 
3039                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_HT40_MINUS])
3040                                                 e->flags |= IWINFO_FREQ_NO_HT40MINUS;
3041                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_HT40_PLUS])
3042                                                 e->flags |= IWINFO_FREQ_NO_HT40PLUS;
3043                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_80MHZ])
3044                                                 e->flags |= IWINFO_FREQ_NO_80MHZ;
3045                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_160MHZ])
3046                                                 e->flags |= IWINFO_FREQ_NO_160MHZ;
3047                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_20MHZ])
3048                                                 e->flags |= IWINFO_FREQ_NO_20MHZ;
3049                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_10MHZ])
3050                                                 e->flags |= IWINFO_FREQ_NO_10MHZ;
3051                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_HE])
3052                                                 e->flags |= IWINFO_FREQ_NO_HE;
3053                                         if (freqs[NL80211_FREQUENCY_ATTR_NO_IR] &&
3054                                             !freqs[NL80211_FREQUENCY_ATTR_RADAR])
3055                                                 e->flags |= IWINFO_FREQ_NO_IR;
3056                                         if (freqs[NL80211_FREQUENCY_ATTR_INDOOR_ONLY])
3057                                                 e->flags |= IWINFO_FREQ_INDOOR_ONLY;
3058 
3059                                         /* keep backwards compatibility */
3060                                         e->restricted = (e->flags & IWINFO_FREQ_NO_IR) ? 1 : 0;
3061 
3062                                         e++;
3063                                         arr->count++;
3064                                 }
3065                         }
3066                 }
3067         }
3068 
3069         return NL_SKIP;
3070 }
3071 
3072 static int nl80211_get_freqlist(const char *ifname, char *buf, int *len)
3073 {
3074         struct nl80211_msg_conveyor *cv;
3075         struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
3076         uint32_t features = nl80211_get_protocol_features(ifname);
3077         int flags;
3078 
3079         flags = features & NL80211_PROTOCOL_FEATURE_SPLIT_WIPHY_DUMP ? NLM_F_DUMP : 0;
3080         cv = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, flags);
3081         if (!cv)
3082                 goto out;
3083 
3084         NLA_PUT_FLAG(cv->msg, NL80211_ATTR_SPLIT_WIPHY_DUMP);
3085         if (nl80211_send(cv, nl80211_get_freqlist_cb, &arr))
3086                 goto out;
3087 
3088         *len = arr.count * sizeof(struct iwinfo_freqlist_entry);
3089         return 0;
3090 
3091 nla_put_failure:
3092         nl80211_free(cv);
3093 out:
3094         *len = 0;
3095         return -1;
3096 }
3097 
3098 static int nl80211_get_country_cb(struct nl_msg *msg, void *arg)
3099 {
3100         char *buf = arg;
3101         struct nlattr **attr = nl80211_parse(msg);
3102 
3103         if (attr[NL80211_ATTR_REG_ALPHA2])
3104                 memcpy(buf, nla_data(attr[NL80211_ATTR_REG_ALPHA2]), 2);
3105         else
3106                 buf[0] = 0;
3107 
3108         return NL_SKIP;
3109 }
3110 
3111 static int nl80211_get_country(const char *ifname, char *buf)
3112 {
3113         if (nl80211_request(ifname, NL80211_CMD_GET_REG, 0,
3114                             nl80211_get_country_cb, buf))
3115                 return -1;
3116 
3117         return 0;
3118 }
3119 
3120 static int nl80211_get_countrylist(const char *ifname, char *buf, int *len)
3121 {
3122         int count;
3123         struct iwinfo_country_entry *e = (struct iwinfo_country_entry *)buf;
3124         const struct iwinfo_iso3166_label *l;
3125 
3126         for (l = IWINFO_ISO3166_NAMES, count = 0; l->iso3166; l++, e++, count++)
3127         {
3128                 e->iso3166 = l->iso3166;
3129                 e->ccode[0] = (l->iso3166 / 256);
3130                 e->ccode[1] = (l->iso3166 % 256);
3131                 e->ccode[2] = 0;
3132         }
3133 
3134         *len = (count * sizeof(struct iwinfo_country_entry));
3135         return 0;
3136 }
3137 
3138 
3139 struct nl80211_modes
3140 {
3141         bool ok;
3142         uint32_t hw;
3143         uint32_t ht;
3144 
3145         uint8_t bands;
3146 
3147         uint16_t nl_ht;
3148         uint32_t nl_vht;
3149         uint16_t he_phy_cap[6];
3150 };
3151 
3152 static void nl80211_eval_modelist(struct nl80211_modes *m)
3153 {
3154         /* Treat any nonzero capability as 11n */
3155         if (m->nl_ht > 0)
3156         {
3157                 m->hw |= IWINFO_80211_N;
3158                 m->ht |= IWINFO_HTMODE_HT20;
3159 
3160                 if (m->nl_ht & (1 << 1))
3161                         m->ht |= IWINFO_HTMODE_HT40;
3162         }
3163 
3164         if (m->he_phy_cap[0] != 0) {
3165                 m->hw |= IWINFO_80211_AX;
3166                 m->ht |= IWINFO_HTMODE_HE20;
3167 
3168                 if (m->he_phy_cap[0] & BIT(9))
3169                         m->ht |= IWINFO_HTMODE_HE40;
3170                 if (m->he_phy_cap[0] & BIT(10))
3171                         m->ht |= IWINFO_HTMODE_HE40 | IWINFO_HTMODE_HE80;
3172                 if (m->he_phy_cap[0] & BIT(11))
3173                         m->ht |= IWINFO_HTMODE_HE160;
3174                 if (m->he_phy_cap[0] & BIT(12))
3175                         m->ht |= IWINFO_HTMODE_HE160 | IWINFO_HTMODE_HE80_80;
3176         }
3177 
3178         if (m->bands & IWINFO_BAND_24)
3179         {
3180                 m->hw |= IWINFO_80211_B;
3181                 m->hw |= IWINFO_80211_G;
3182         }
3183 
3184         if (m->bands & IWINFO_BAND_5)
3185         {
3186                 /* Treat any nonzero capability as 11ac */
3187                 if (m->nl_vht > 0)
3188                 {
3189                         m->hw |= IWINFO_80211_AC;
3190                         m->ht |= IWINFO_HTMODE_VHT20 | IWINFO_HTMODE_VHT40 | IWINFO_HTMODE_VHT80;
3191 
3192                         switch ((m->nl_vht >> 2) & 3)
3193                         {
3194                         case 2:
3195                                 m->ht |= IWINFO_HTMODE_VHT80_80;
3196                                 /* fall through */
3197 
3198                         case 1:
3199                                 m->ht |= IWINFO_HTMODE_VHT160;
3200                         }
3201                 }
3202                 else
3203                 {
3204                         m->hw |= IWINFO_80211_A;
3205                 }
3206         }
3207 
3208         if (m->bands & IWINFO_BAND_60)
3209         {
3210                 m->hw |= IWINFO_80211_AD;
3211         }
3212 
3213 }
3214 
3215 static int nl80211_get_modelist_cb(struct nl_msg *msg, void *arg)
3216 {
3217         struct nl80211_modes *m = arg;
3218         int bands_remain;
3219         struct nlattr **attr = nl80211_parse(msg);
3220         struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
3221         struct nlattr *band;
3222 
3223         if (attr[NL80211_ATTR_WIPHY_BANDS])
3224         {
3225                 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
3226                 {
3227                         m->bands |= nl80211_get_band(band->nla_type);
3228 
3229                         nla_parse(bands, NL80211_BAND_ATTR_MAX,
3230                                   nla_data(band), nla_len(band), NULL);
3231 
3232                         if (bands[NL80211_BAND_ATTR_HT_CAPA])
3233                                 m->nl_ht = nla_get_u16(bands[NL80211_BAND_ATTR_HT_CAPA]);
3234 
3235                         if (bands[NL80211_BAND_ATTR_VHT_CAPA])
3236                                 m->nl_vht = nla_get_u32(bands[NL80211_BAND_ATTR_VHT_CAPA]);
3237 
3238                         if (bands[NL80211_BAND_ATTR_IFTYPE_DATA]) {
3239                                 struct nlattr *tb[NL80211_BAND_IFTYPE_ATTR_MAX + 1];
3240                                 struct nlattr *nl_iftype;
3241                                 int rem_band;
3242                                 int len;
3243 
3244                                 nla_for_each_nested(nl_iftype, bands[NL80211_BAND_ATTR_IFTYPE_DATA], rem_band) {
3245                                         nla_parse(tb, NL80211_BAND_IFTYPE_ATTR_MAX,
3246                                                   nla_data(nl_iftype), nla_len(nl_iftype), NULL);
3247                                         if (tb[NL80211_BAND_IFTYPE_ATTR_HE_CAP_PHY]) {
3248                                                 len = nla_len(tb[NL80211_BAND_IFTYPE_ATTR_HE_CAP_PHY]);
3249 
3250                                                 if (len > sizeof(m->he_phy_cap) - 1)
3251                                                         len = sizeof(m->he_phy_cap) - 1;
3252                                                 memcpy(&((__u8 *)m->he_phy_cap)[1],
3253                                                         nla_data(tb[NL80211_BAND_IFTYPE_ATTR_HE_CAP_PHY]),
3254                                                         len);
3255                                         }
3256                                 }
3257                         }
3258                 }
3259 
3260                 m->ok = 1;
3261         }
3262 
3263         return NL_SKIP;
3264 }
3265 
3266 static int nl80211_get_hwmodelist(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.hw;
3285 
3286         return 0;
3287 
3288 nla_put_failure:
3289         nl80211_free(cv);
3290 out:
3291         return -1;
3292 }
3293 
3294 struct chan_info {
3295         int width;
3296         int mode;
3297 };
3298 
3299 static int nl80211_get_htmode_cb(struct nl_msg *msg, void *arg)
3300 {
3301         struct nlattr **tb = nl80211_parse(msg);
3302         struct nlattr *cur;
3303         struct chan_info *chn = arg;
3304 
3305         if ((cur = tb[NL80211_ATTR_CHANNEL_WIDTH]))
3306                 chn->width = nla_get_u32(cur);
3307 
3308         if ((cur = tb[NL80211_ATTR_BSS_HT_OPMODE]))
3309                 chn->mode = nla_get_u32(cur);
3310 
3311         return NL_SKIP;
3312 }
3313 
3314 static int nl80211_get_htmode(const char *ifname, int *buf)
3315 {
3316         struct chan_info chn = { 0 };
3317         char *res, b[2] = { 0 };
3318         int err;
3319         bool he = false;
3320 
3321         res = nl80211_phy2ifname(ifname);
3322         *buf = 0;
3323 
3324         err =  nl80211_request(res ? res : ifname,
3325                                 NL80211_CMD_GET_INTERFACE, 0,
3326                                 nl80211_get_htmode_cb, &chn);
3327         if (err)
3328                 return -1;
3329 
3330         if (nl80211_hostapd_query(res ? res : ifname, "ieee80211ax", b, sizeof(b)))
3331                 he = b[0] == '1';
3332         else if (nl80211_wpactl_query(res ? res : ifname, "wifi_generation", b, sizeof(b)))
3333                 he = b[0] == '6';
3334 
3335         switch (chn.width) {
3336         case NL80211_CHAN_WIDTH_20:
3337                 if (he)
3338                         *buf = IWINFO_HTMODE_HE20;
3339                 else if (chn.mode == -1)
3340                         *buf = IWINFO_HTMODE_VHT20;
3341                 else
3342                         *buf = IWINFO_HTMODE_HT20;
3343                 break;
3344         case NL80211_CHAN_WIDTH_40:
3345                 if (he)
3346                         *buf = IWINFO_HTMODE_HE40;
3347                 else if (chn.mode == -1)
3348                         *buf = IWINFO_HTMODE_VHT40;
3349                 else
3350                         *buf = IWINFO_HTMODE_HT40;
3351                 break;
3352         case NL80211_CHAN_WIDTH_80:
3353                 if (he)
3354                         *buf = IWINFO_HTMODE_HE80;
3355                 else
3356                         *buf = IWINFO_HTMODE_VHT80;
3357                 break;
3358         case NL80211_CHAN_WIDTH_80P80:
3359                 if (he)
3360                         *buf = IWINFO_HTMODE_HE80_80;
3361                 else
3362                         *buf = IWINFO_HTMODE_VHT80_80;
3363                 break;
3364         case NL80211_CHAN_WIDTH_160:
3365                 if (he)
3366                         *buf = IWINFO_HTMODE_HE160;
3367                 else
3368                         *buf = IWINFO_HTMODE_VHT160;
3369                 break;
3370         case NL80211_CHAN_WIDTH_5:
3371         case NL80211_CHAN_WIDTH_10:
3372         case NL80211_CHAN_WIDTH_20_NOHT:
3373                 *buf = IWINFO_HTMODE_NOHT;
3374                 break;
3375         default:
3376                 return -1;
3377         }
3378 
3379         return 0;
3380 }
3381 
3382 static int nl80211_get_htmodelist(const char *ifname, int *buf)
3383 {
3384         struct nl80211_msg_conveyor *cv;
3385         struct nl80211_modes m = {};
3386         uint32_t features = nl80211_get_protocol_features(ifname);
3387         int flags;
3388 
3389         flags = features & NL80211_PROTOCOL_FEATURE_SPLIT_WIPHY_DUMP ? NLM_F_DUMP : 0;
3390         cv = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, flags);
3391         if (!cv)
3392                 goto out;
3393 
3394         NLA_PUT_FLAG(cv->msg, NL80211_ATTR_SPLIT_WIPHY_DUMP);
3395         if (nl80211_send(cv, nl80211_get_modelist_cb, &m))
3396                 goto nla_put_failure;
3397 
3398         nl80211_eval_modelist(&m);
3399 
3400         *buf = m.ht;
3401 
3402         return 0;
3403 
3404 nla_put_failure:
3405         nl80211_free(cv);
3406 out:
3407         return -1;
3408 }
3409 
3410 
3411 static int nl80211_get_ifcomb_cb(struct nl_msg *msg, void *arg)
3412 {
3413         struct nlattr **attr = nl80211_parse(msg);
3414         struct nlattr *comb;
3415         int *ret = arg;
3416         int comb_rem, limit_rem, mode_rem;
3417 
3418         *ret = 0;
3419         if (!attr[NL80211_ATTR_INTERFACE_COMBINATIONS])
3420                 return NL_SKIP;
3421 
3422         nla_for_each_nested(comb, attr[NL80211_ATTR_INTERFACE_COMBINATIONS], comb_rem)
3423         {
3424                 static struct nla_policy iface_combination_policy[NUM_NL80211_IFACE_COMB] = {
3425                         [NL80211_IFACE_COMB_LIMITS] = { .type = NLA_NESTED },
3426                         [NL80211_IFACE_COMB_MAXNUM] = { .type = NLA_U32 },
3427                 };
3428                 struct nlattr *tb_comb[NUM_NL80211_IFACE_COMB+1];
3429                 static struct nla_policy iface_limit_policy[NUM_NL80211_IFACE_LIMIT] = {
3430                         [NL80211_IFACE_LIMIT_TYPES] = { .type = NLA_NESTED },
3431                         [NL80211_IFACE_LIMIT_MAX] = { .type = NLA_U32 },
3432                 };
3433                 struct nlattr *tb_limit[NUM_NL80211_IFACE_LIMIT+1];
3434                 struct nlattr *limit;
3435 
3436                 nla_parse_nested(tb_comb, NUM_NL80211_IFACE_COMB, comb, iface_combination_policy);
3437 
3438                 if (!tb_comb[NL80211_IFACE_COMB_LIMITS])
3439                         continue;
3440 
3441                 nla_for_each_nested(limit, tb_comb[NL80211_IFACE_COMB_LIMITS], limit_rem)
3442                 {
3443                         struct nlattr *mode;
3444 
3445                         nla_parse_nested(tb_limit, NUM_NL80211_IFACE_LIMIT, limit, iface_limit_policy);
3446 
3447                         if (!tb_limit[NL80211_IFACE_LIMIT_TYPES] ||
3448                             !tb_limit[NL80211_IFACE_LIMIT_MAX])
3449                                 continue;
3450 
3451                         if (nla_get_u32(tb_limit[NL80211_IFACE_LIMIT_MAX]) < 2)
3452                                 continue;
3453 
3454                         nla_for_each_nested(mode, tb_limit[NL80211_IFACE_LIMIT_TYPES], mode_rem) {
3455                                 if (nla_type(mode) == NL80211_IFTYPE_AP)
3456                                         *ret = 1;
3457                         }
3458                 }
3459         }
3460 
3461         return NL_SKIP;
3462 }
3463 
3464 static int nl80211_get_mbssid_support(const char *ifname, int *buf)
3465 {
3466         if (nl80211_request(ifname, NL80211_CMD_GET_WIPHY, 0,
3467                             nl80211_get_ifcomb_cb, buf))
3468                 return -1;
3469 
3470         return 0;
3471 }
3472 
3473 static int nl80211_hardware_id_from_fdt(struct iwinfo_hardware_id *id, const char *ifname)
3474 {
3475         char *phy, path[PATH_MAX];
3476 
3477         /* Try to determine the phy name from the given interface */
3478         phy = nl80211_ifname2phy(ifname);
3479 
3480         snprintf(path, sizeof(path), "/sys/class/%s/%s/device/of_node/compatible",
3481                  phy ? "ieee80211" : "net", phy ? phy : ifname);
3482 
3483         if (nl80211_readstr(path, id->compatible, sizeof(id->compatible)) <= 0)
3484                 return -1;
3485 
3486         return 0;
3487 }
3488 
3489 
3490 static int nl80211_get_hardware_id(const char *ifname, char *buf)
3491 {
3492         struct iwinfo_hardware_id *id = (struct iwinfo_hardware_id *)buf;
3493         char *phy, num[8], path[PATH_MAX];
3494         int i;
3495 
3496         struct { const char *path; uint16_t *dest; } lookup[] = {
3497                 { "vendor", &id->vendor_id },
3498                 { "device", &id->device_id },
3499                 { "subsystem_vendor", &id->subsystem_vendor_id },
3500                 { "subsystem_device", &id->subsystem_device_id },
3501                 { "../idVendor", &id->subsystem_vendor_id },
3502                 { "../idProduct", &id->subsystem_device_id }
3503         };
3504 
3505         memset(id, 0, sizeof(*id));
3506 
3507         /* Try to determine the phy name from the given interface */
3508         phy = nl80211_ifname2phy(ifname);
3509 
3510         for (i = 0; i < ARRAY_SIZE(lookup); i++)
3511         {
3512                 snprintf(path, sizeof(path), "/sys/class/%s/%s/device/%s",
3513                          phy ? "ieee80211" : "net",
3514                          phy ? phy : ifname, lookup[i].path);
3515 
3516                 if (nl80211_readstr(path, num, sizeof(num)) > 0)
3517                         *lookup[i].dest = strtoul(num, NULL, 16);
3518         }
3519 
3520         /* Failed to obtain hardware PCI/USB IDs... */
3521         if (id->vendor_id == 0 && id->device_id == 0 &&
3522             id->subsystem_vendor_id == 0 && id->subsystem_device_id == 0)
3523                 /* ... first fallback to FDT ... */
3524                 if (nl80211_hardware_id_from_fdt(id, ifname) == -1)
3525                         /* ... then board config */
3526                         return iwinfo_hardware_id_from_mtd(id);
3527 
3528         return 0;
3529 }
3530 
3531 static const struct iwinfo_hardware_entry *
3532 nl80211_get_hardware_entry(const char *ifname)
3533 {
3534         struct iwinfo_hardware_id id;
3535 
3536         if (nl80211_get_hardware_id(ifname, (char *)&id))
3537                 return NULL;
3538 
3539         return iwinfo_hardware(&id);
3540 }
3541 
3542 static int nl80211_get_hardware_name(const char *ifname, char *buf)
3543 {
3544         const struct iwinfo_hardware_entry *hw;
3545 
3546         if (!(hw = nl80211_get_hardware_entry(ifname)))
3547                 sprintf(buf, "Generic MAC80211");
3548         else
3549                 sprintf(buf, "%s %s", hw->vendor_name, hw->device_name);
3550 
3551         return 0;
3552 }
3553 
3554 static int nl80211_get_txpower_offset(const char *ifname, int *buf)
3555 {
3556         const struct iwinfo_hardware_entry *hw;
3557 
3558         if (!(hw = nl80211_get_hardware_entry(ifname)))
3559                 return -1;
3560 
3561         *buf = hw->txpower_offset;
3562         return 0;
3563 }
3564 
3565 static int nl80211_get_frequency_offset(const char *ifname, int *buf)
3566 {
3567         const struct iwinfo_hardware_entry *hw;
3568 
3569         if (!(hw = nl80211_get_hardware_entry(ifname)))
3570                 return -1;
3571 
3572         *buf = hw->frequency_offset;
3573         return 0;
3574 }
3575 
3576 static int nl80211_lookup_phyname(const char *section, char *buf)
3577 {
3578         const char *name;
3579         int idx;
3580 
3581         if (!strncmp(section, "path=", 5))
3582                 idx = nl80211_phy_idx_from_path(section + 5);
3583         else if (!strncmp(section, "macaddr=", 8))
3584                 idx = nl80211_phy_idx_from_macaddr(section + 8);
3585         else
3586                 idx = nl80211_phy_idx_from_uci(section);
3587 
3588         if (idx < 0)
3589                 return -1;
3590 
3591         name = nl80211_phyidx2name(idx);
3592         if (!name)
3593                 return -1;
3594 
3595         strcpy(buf, name);
3596         return 0;
3597 }
3598 
3599 static int nl80211_phy_path(const char *phyname, const char **path)
3600 {
3601         if (strchr(phyname, '/'))
3602                 return -1;
3603 
3604         *path = nl80211_phy_path_str(phyname);
3605         if (!*path)
3606                 return -1;
3607 
3608         return 0;
3609 }
3610 
3611 const struct iwinfo_ops nl80211_ops = {
3612         .name             = "nl80211",
3613         .probe            = nl80211_probe,
3614         .channel          = nl80211_get_channel,
3615         .center_chan1     = nl80211_get_center_chan1,
3616         .center_chan2     = nl80211_get_center_chan2,
3617         .frequency        = nl80211_get_frequency,
3618         .frequency_offset = nl80211_get_frequency_offset,
3619         .txpower          = nl80211_get_txpower,
3620         .txpower_offset   = nl80211_get_txpower_offset,
3621         .bitrate          = nl80211_get_bitrate,
3622         .signal           = nl80211_get_signal,
3623         .noise            = nl80211_get_noise,
3624         .quality          = nl80211_get_quality,
3625         .quality_max      = nl80211_get_quality_max,
3626         .mbssid_support   = nl80211_get_mbssid_support,
3627         .hwmodelist       = nl80211_get_hwmodelist,
3628         .htmodelist       = nl80211_get_htmodelist,
3629         .htmode           = nl80211_get_htmode,
3630         .mode             = nl80211_get_mode,
3631         .ssid             = nl80211_get_ssid,
3632         .bssid            = nl80211_get_bssid,
3633         .country          = nl80211_get_country,
3634         .hardware_id      = nl80211_get_hardware_id,
3635         .hardware_name    = nl80211_get_hardware_name,
3636         .encryption       = nl80211_get_encryption,
3637         .phyname          = nl80211_get_phyname,
3638         .assoclist        = nl80211_get_assoclist,
3639         .txpwrlist        = nl80211_get_txpwrlist,
3640         .scanlist         = nl80211_get_scanlist,
3641         .freqlist         = nl80211_get_freqlist,
3642         .countrylist      = nl80211_get_countrylist,
3643         .survey           = nl80211_get_survey,
3644         .lookup_phy       = nl80211_lookup_phyname,
3645         .phy_path         = nl80211_phy_path,
3646         .close            = nl80211_close
3647 };
3648 

This page was automatically generated by LXR 0.3.1.  •  OpenWrt