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iwinfo: fix segmentation fault when doing two consecutive scans through wpa_supplican...
[openwrt/openwrt.git] / package / iwinfo / src / iwinfo_nl80211.c
1 /*
2 * iwinfo - Wireless Information Library - NL80211 Backend
3 *
4 * Copyright (C) 2010 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 "iwinfo/nl80211.h"
26 #include "iwinfo/wext.h"
27
28 #define min(x, y) ((x) < (y)) ? (x) : (y)
29
30 static struct nl80211_state *nls = NULL;
31
32 static int nl80211_init(void)
33 {
34 int err, fd;
35
36 if (!nls)
37 {
38 nls = malloc(sizeof(struct nl80211_state));
39 if (!nls) {
40 err = -ENOMEM;
41 goto err;
42 }
43
44 nls->nl_sock = nl_socket_alloc();
45 if (!nls->nl_sock) {
46 err = -ENOMEM;
47 goto err;
48 }
49
50 if( genl_connect(nls->nl_sock)) {
51 err = -ENOLINK;
52 goto err;
53 }
54
55 fd = nl_socket_get_fd(nls->nl_sock);
56 if (fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC) < 0)
57 {
58 err = -EINVAL;
59 goto err;
60 }
61
62 if( genl_ctrl_alloc_cache(nls->nl_sock, &nls->nl_cache)) {
63 err = -ENOMEM;
64 goto err;
65 }
66
67 nls->nl80211 = genl_ctrl_search_by_name(nls->nl_cache, "nl80211");
68 if (!nls->nl80211)
69 {
70 err = -ENOENT;
71 goto err;
72 }
73 }
74
75 return 0;
76
77
78 err:
79 nl80211_close();
80 return err;
81 }
82
83 static int nl80211_msg_error(struct sockaddr_nl *nla,
84 struct nlmsgerr *err, void *arg)
85 {
86 int *ret = arg;
87 *ret = err->error;
88 return NL_STOP;
89 }
90
91 static int nl80211_msg_finish(struct nl_msg *msg, void *arg)
92 {
93 int *ret = arg;
94 *ret = 0;
95 return NL_SKIP;
96 }
97
98 static int nl80211_msg_ack(struct nl_msg *msg, void *arg)
99 {
100 int *ret = arg;
101 *ret = 0;
102 return NL_STOP;
103 }
104
105 static int nl80211_msg_response(struct nl_msg *msg, void *arg)
106 {
107 return NL_SKIP;
108 }
109
110 static void nl80211_free(struct nl80211_msg_conveyor *cv)
111 {
112 if (cv)
113 {
114 if (cv->cb)
115 nl_cb_put(cv->cb);
116
117 if (cv->msg)
118 nlmsg_free(cv->msg);
119
120 cv->cb = NULL;
121 cv->msg = NULL;
122 }
123 }
124
125 static struct nl80211_msg_conveyor * nl80211_msg(const char *ifname, int cmd, int flags)
126 {
127 static struct nl80211_msg_conveyor cv;
128
129 int ifidx = -1, phyidx = -1;
130 struct nl_msg *req = NULL;
131 struct nl_cb *cb = NULL;
132
133 if (nl80211_init() < 0)
134 goto err;
135
136 if (!strncmp(ifname, "phy", 3))
137 phyidx = atoi(&ifname[3]);
138 else if (!strncmp(ifname, "radio", 5))
139 phyidx = atoi(&ifname[5]);
140 else if (!strncmp(ifname, "mon.", 4))
141 ifidx = if_nametoindex(&ifname[4]);
142 else
143 ifidx = if_nametoindex(ifname);
144
145 if ((ifidx < 0) && (phyidx < 0))
146 return NULL;
147
148 req = nlmsg_alloc();
149 if (!req)
150 goto err;
151
152 cb = nl_cb_alloc(NL_CB_DEFAULT);
153 if (!cb)
154 goto err;
155
156 genlmsg_put(req, 0, 0, genl_family_get_id(nls->nl80211), 0,
157 flags, cmd, 0);
158
159 if (ifidx > -1)
160 NLA_PUT_U32(req, NL80211_ATTR_IFINDEX, ifidx);
161
162 if (phyidx > -1)
163 NLA_PUT_U32(req, NL80211_ATTR_WIPHY, phyidx);
164
165 cv.msg = req;
166 cv.cb = cb;
167
168 return &cv;
169
170 err:
171 nla_put_failure:
172 if (cb)
173 nl_cb_put(cb);
174
175 if (req)
176 nlmsg_free(req);
177
178 return NULL;
179 }
180
181 static struct nl80211_msg_conveyor * nl80211_send(
182 struct nl80211_msg_conveyor *cv,
183 int (*cb_func)(struct nl_msg *, void *), void *cb_arg
184 ) {
185 static struct nl80211_msg_conveyor rcv;
186 int err = 1;
187
188 if (cb_func)
189 nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, cb_func, cb_arg);
190 else
191 nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, nl80211_msg_response, &rcv);
192
193 if (nl_send_auto_complete(nls->nl_sock, cv->msg) < 0)
194 goto err;
195
196 nl_cb_err(cv->cb, NL_CB_CUSTOM, nl80211_msg_error, &err);
197 nl_cb_set(cv->cb, NL_CB_FINISH, NL_CB_CUSTOM, nl80211_msg_finish, &err);
198 nl_cb_set(cv->cb, NL_CB_ACK, NL_CB_CUSTOM, nl80211_msg_ack, &err);
199
200 while (err > 0)
201 nl_recvmsgs(nls->nl_sock, cv->cb);
202
203 return &rcv;
204
205 err:
206 nl_cb_put(cv->cb);
207 nlmsg_free(cv->msg);
208
209 return NULL;
210 }
211
212 static struct nlattr ** nl80211_parse(struct nl_msg *msg)
213 {
214 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
215 static struct nlattr *attr[NL80211_ATTR_MAX + 1];
216
217 nla_parse(attr, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
218 genlmsg_attrlen(gnlh, 0), NULL);
219
220 return attr;
221 }
222
223 static int nl80211_freq2channel(int freq)
224 {
225 if (freq == 2484)
226 return 14;
227
228 if (freq < 2484)
229 return (freq - 2407) / 5;
230
231 return (freq / 5) - 1000;
232 }
233
234 static char * nl80211_getval(const char *ifname, const char *buf, const char *key)
235 {
236 int i, len;
237 char lkey[64] = { 0 };
238 const char *ln = buf;
239 static char lval[256] = { 0 };
240
241 int matched_if = ifname ? 0 : 1;
242
243
244 for( i = 0, len = strlen(buf); i < len; i++ )
245 {
246 if (!lkey[0] && (buf[i] == ' ' || buf[i] == '\t'))
247 {
248 ln++;
249 }
250 else if (!lkey[0] && (buf[i] == '='))
251 {
252 if ((&buf[i] - ln) > 0)
253 memcpy(lkey, ln, min(sizeof(lkey) - 1, &buf[i] - ln));
254 }
255 else if (buf[i] == '\n')
256 {
257 if (lkey[0])
258 {
259 memcpy(lval, ln + strlen(lkey) + 1,
260 min(sizeof(lval) - 1, &buf[i] - ln - strlen(lkey) - 1));
261
262 if ((ifname != NULL) &&
263 (!strcmp(lkey, "interface") || !strcmp(lkey, "bss")) )
264 {
265 matched_if = !strcmp(lval, ifname);
266 }
267 else if (matched_if && !strcmp(lkey, key))
268 {
269 return lval;
270 }
271 }
272
273 ln = &buf[i+1];
274 memset(lkey, 0, sizeof(lkey));
275 memset(lval, 0, sizeof(lval));
276 }
277 }
278
279 return NULL;
280 }
281
282 static int nl80211_ifname2phy_cb(struct nl_msg *msg, void *arg)
283 {
284 char *buf = arg;
285 struct nlattr **attr = nl80211_parse(msg);
286
287 if (attr[NL80211_ATTR_WIPHY_NAME])
288 sprintf(buf, "%s", nla_data(attr[NL80211_ATTR_WIPHY_NAME]));
289 else
290 buf[0] = 0;
291
292 return NL_SKIP;
293 }
294
295 static char * nl80211_ifname2phy(const char *ifname)
296 {
297 static char phy[32] = { 0 };
298 struct nl80211_msg_conveyor *req;
299
300 memset(phy, 0, sizeof(phy));
301
302 req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
303 if (req)
304 {
305 nl80211_send(req, nl80211_ifname2phy_cb, phy);
306 nl80211_free(req);
307 }
308
309 return phy[0] ? phy : NULL;
310 }
311
312 static char * nl80211_hostapd_info(const char *ifname)
313 {
314 char *phy;
315 char path[32] = { 0 };
316 static char buf[4096] = { 0 };
317 FILE *conf;
318
319 if ((phy = nl80211_ifname2phy(ifname)) != NULL)
320 {
321 snprintf(path, sizeof(path), "/var/run/hostapd-%s.conf", phy);
322
323 if ((conf = fopen(path, "r")) != NULL)
324 {
325 fread(buf, sizeof(buf) - 1, 1, conf);
326 fclose(conf);
327
328 return buf;
329 }
330 }
331
332 return NULL;
333 }
334
335 static inline int nl80211_wpactl_recv(int sock, char *buf, int blen)
336 {
337 fd_set rfds;
338 struct timeval tv = { 2, 0 };
339
340 FD_ZERO(&rfds);
341 FD_SET(sock, &rfds);
342
343 memset(buf, 0, blen);
344
345
346 if (select(sock + 1, &rfds, NULL, NULL, &tv) < 0)
347 return -1;
348
349 if (!FD_ISSET(sock, &rfds))
350 return -1;
351
352 return recv(sock, buf, blen, 0);
353 }
354
355 static char * nl80211_wpactl_info(const char *ifname, const char *cmd,
356 const char *event)
357 {
358 int numtry = 0;
359 int sock = -1;
360 char *rv = NULL;
361 size_t remote_length, local_length;
362 static char buffer[10240] = { 0 };
363
364 struct sockaddr_un local = { 0 };
365 struct sockaddr_un remote = { 0 };
366
367
368 sock = socket(PF_UNIX, SOCK_DGRAM, 0);
369 if (sock < 0)
370 return NULL;
371
372 remote.sun_family = AF_UNIX;
373 remote_length = sizeof(remote.sun_family) + sprintf(remote.sun_path,
374 "/var/run/wpa_supplicant-%s/%s", ifname, ifname);
375
376 if (fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC) < 0)
377 goto out;
378
379 if (connect(sock, (struct sockaddr *) &remote, remote_length))
380 goto out;
381
382 local.sun_family = AF_UNIX;
383 local_length = sizeof(local.sun_family) + sprintf(local.sun_path,
384 "/var/run/iwinfo-%s-%d", ifname, getpid());
385
386 if (bind(sock, (struct sockaddr *) &local, local_length))
387 goto out;
388
389
390 if (event)
391 {
392 send(sock, "ATTACH", 6, 0);
393
394 if (nl80211_wpactl_recv(sock, buffer, sizeof(buffer)) <= 0)
395 goto out;
396 }
397
398
399 send(sock, cmd, strlen(cmd), 0);
400
401 while( numtry++ < 5 )
402 {
403 if (nl80211_wpactl_recv(sock, buffer, sizeof(buffer)) <= 0)
404 {
405 if (event)
406 continue;
407
408 break;
409 }
410
411 if ((!event && buffer[0] != '<') || (event && strstr(buffer, event)))
412 break;
413 }
414
415 rv = buffer;
416
417 out:
418 close(sock);
419
420 if (local.sun_family)
421 unlink(local.sun_path);
422
423 return rv;
424 }
425
426 static inline int nl80211_readint(const char *path)
427 {
428 int fd;
429 int rv = -1;
430 char buffer[16];
431
432 if ((fd = open(path, O_RDONLY)) > -1)
433 {
434 if (read(fd, buffer, sizeof(buffer)) > 0)
435 rv = atoi(buffer);
436
437 close(fd);
438 }
439
440 return rv;
441 }
442
443 static char * nl80211_phy2ifname(const char *ifname)
444 {
445 int fd, ifidx = -1, cifidx = -1, phyidx = -1;
446 char buffer[64];
447 static char nif[IFNAMSIZ] = { 0 };
448
449 DIR *d;
450 struct dirent *e;
451
452 if (!ifname)
453 return NULL;
454 else if (!strncmp(ifname, "phy", 3))
455 phyidx = atoi(&ifname[3]);
456 else if (!strncmp(ifname, "radio", 5))
457 phyidx = atoi(&ifname[5]);
458
459 memset(nif, 0, sizeof(nif));
460
461 if (phyidx > -1)
462 {
463 if ((d = opendir("/sys/class/net")) != NULL)
464 {
465 while( (e = readdir(d)) != NULL )
466 {
467 snprintf(buffer, sizeof(buffer),
468 "/sys/class/net/%s/phy80211/index", e->d_name);
469
470 if (nl80211_readint(buffer) == phyidx)
471 {
472 snprintf(buffer, sizeof(buffer),
473 "/sys/class/net/%s/ifindex", e->d_name);
474
475 if( (cifidx = nl80211_readint(buffer)) >= 0 &&
476 ((ifidx < 0) || (cifidx < ifidx)) )
477 {
478 ifidx = cifidx;
479 strncpy(nif, e->d_name, sizeof(nif));
480 }
481 }
482 }
483
484 closedir(d);
485 }
486 }
487
488 return nif[0] ? nif : NULL;
489 }
490
491 static char * nl80211_ifadd(const char *ifname)
492 {
493 int phyidx;
494 char *rv = NULL;
495 static char nif[IFNAMSIZ] = { 0 };
496 struct nl80211_msg_conveyor *req, *res;
497
498 req = nl80211_msg(ifname, NL80211_CMD_NEW_INTERFACE, 0);
499 if (req)
500 {
501 snprintf(nif, sizeof(nif), "tmp.%s", ifname);
502
503 NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, nif);
504 NLA_PUT_U32(req->msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_STATION);
505
506 nl80211_send(req, NULL, NULL);
507
508 rv = nif;
509
510 nla_put_failure:
511 nl80211_free(req);
512 }
513
514 return rv;
515 }
516
517 static void nl80211_ifdel(const char *ifname)
518 {
519 struct nl80211_msg_conveyor *req;
520
521 req = nl80211_msg(ifname, NL80211_CMD_DEL_INTERFACE, 0);
522 if (req)
523 {
524 NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, ifname);
525
526 nl80211_send(req, NULL, NULL);
527
528 nla_put_failure:
529 nl80211_free(req);
530 }
531 }
532
533 static void nl80211_hostapd_hup(const char *ifname)
534 {
535 int fd, pid = 0;
536 char buf[32];
537 char *phy = nl80211_ifname2phy(ifname);
538
539 if (phy)
540 {
541 snprintf(buf, sizeof(buf), "/var/run/wifi-%s.pid", phy);
542 if ((fd = open(buf, O_RDONLY)) > 0)
543 {
544 if (read(fd, buf, sizeof(buf)) > 0)
545 pid = atoi(buf);
546
547 close(fd);
548 }
549
550 if (pid > 0)
551 kill(pid, 1);
552 }
553 }
554
555
556 int nl80211_probe(const char *ifname)
557 {
558 return !!nl80211_ifname2phy(ifname);
559 }
560
561 void nl80211_close(void)
562 {
563 if (nls)
564 {
565 if (nls->nl80211)
566 genl_family_put(nls->nl80211);
567
568 if (nls->nl_sock)
569 nl_socket_free(nls->nl_sock);
570
571 if (nls->nl_cache)
572 nl_cache_free(nls->nl_cache);
573
574 free(nls);
575 nls = NULL;
576 }
577 }
578
579 int nl80211_get_mode(const char *ifname, char *buf)
580 {
581 return wext_get_mode(ifname, buf);
582 }
583
584 int nl80211_get_ssid(const char *ifname, char *buf)
585 {
586 char *ssid;
587
588 if (!wext_get_ssid(ifname, buf))
589 {
590 return 0;
591 }
592 else if( (ssid = nl80211_hostapd_info(ifname)) &&
593 (ssid = nl80211_getval(ifname, ssid, "ssid")) )
594 {
595 memcpy(buf, ssid, strlen(ssid));
596 return 0;
597 }
598
599 return -1;
600 }
601
602 int nl80211_get_bssid(const char *ifname, char *buf)
603 {
604 char *bssid;
605 unsigned char mac[6];
606
607 if (!wext_get_bssid(ifname, buf))
608 {
609 return 0;
610 }
611 else if((bssid = nl80211_hostapd_info(ifname)) &&
612 (bssid = nl80211_getval(ifname, bssid, "bssid")))
613 {
614 mac[0] = strtol(&bssid[0], NULL, 16);
615 mac[1] = strtol(&bssid[3], NULL, 16);
616 mac[2] = strtol(&bssid[6], NULL, 16);
617 mac[3] = strtol(&bssid[9], NULL, 16);
618 mac[4] = strtol(&bssid[12], NULL, 16);
619 mac[5] = strtol(&bssid[15], NULL, 16);
620
621 sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
622 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
623
624 return 0;
625 }
626
627 return -1;
628 }
629
630 int nl80211_get_channel(const char *ifname, int *buf)
631 {
632 char *first;
633
634 if (!wext_get_channel(ifname, buf))
635 return 0;
636
637 else if ((first = nl80211_phy2ifname(nl80211_ifname2phy(ifname))) != NULL)
638 return wext_get_channel(first, buf);
639
640 return -1;
641 }
642
643 int nl80211_get_frequency(const char *ifname, int *buf)
644 {
645 char *first;
646
647 if (!wext_get_frequency(ifname, buf))
648 return 0;
649
650 else if ((first = nl80211_phy2ifname(nl80211_ifname2phy(ifname))) != NULL)
651 return wext_get_frequency(first, buf);
652
653 return -1;
654 }
655
656 int nl80211_get_txpower(const char *ifname, int *buf)
657 {
658 return wext_get_txpower(ifname, buf);
659 }
660
661
662 static int nl80211_fill_signal_cb(struct nl_msg *msg, void *arg)
663 {
664 int8_t dbm;
665 int16_t mbit;
666 struct nl80211_rssi_rate *rr = arg;
667 struct nlattr **attr = nl80211_parse(msg);
668 struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
669 struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
670
671 static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
672 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32 },
673 [NL80211_STA_INFO_RX_BYTES] = { .type = NLA_U32 },
674 [NL80211_STA_INFO_TX_BYTES] = { .type = NLA_U32 },
675 [NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 },
676 [NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 },
677 [NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 },
678 [NL80211_STA_INFO_TX_BITRATE] = { .type = NLA_NESTED },
679 [NL80211_STA_INFO_LLID] = { .type = NLA_U16 },
680 [NL80211_STA_INFO_PLID] = { .type = NLA_U16 },
681 [NL80211_STA_INFO_PLINK_STATE] = { .type = NLA_U8 },
682 };
683
684 static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
685 [NL80211_RATE_INFO_BITRATE] = { .type = NLA_U16 },
686 [NL80211_RATE_INFO_MCS] = { .type = NLA_U8 },
687 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG },
688 [NL80211_RATE_INFO_SHORT_GI] = { .type = NLA_FLAG },
689 };
690
691 if (attr[NL80211_ATTR_STA_INFO])
692 {
693 if( !nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
694 attr[NL80211_ATTR_STA_INFO], stats_policy) )
695 {
696 if (sinfo[NL80211_STA_INFO_SIGNAL])
697 {
698 dbm = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
699 rr->rssi = rr->rssi ? (int8_t)((rr->rssi + dbm) / 2) : dbm;
700 }
701
702 if (sinfo[NL80211_STA_INFO_TX_BITRATE])
703 {
704 if( !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
705 sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy) )
706 {
707 if (rinfo[NL80211_RATE_INFO_BITRATE])
708 {
709 mbit = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]);
710 rr->rate = rr->rate
711 ? (int16_t)((rr->rate + mbit) / 2) : mbit;
712 }
713 }
714 }
715 }
716 }
717
718 return NL_SKIP;
719 }
720
721 static void nl80211_fill_signal(const char *ifname, struct nl80211_rssi_rate *r)
722 {
723 DIR *d;
724 struct dirent *de;
725 struct nl80211_msg_conveyor *req;
726
727 r->rssi = 0;
728 r->rate = 0;
729
730 if ((d = opendir("/sys/class/net")) != NULL)
731 {
732 while ((de = readdir(d)) != NULL)
733 {
734 if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
735 (!de->d_name[strlen(ifname)] ||
736 !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
737 {
738 req = nl80211_msg(de->d_name, NL80211_CMD_GET_STATION,
739 NLM_F_DUMP);
740
741 if (req)
742 {
743 nl80211_send(req, nl80211_fill_signal_cb, r);
744 nl80211_free(req);
745 }
746 }
747 }
748
749 closedir(d);
750 }
751 }
752
753 int nl80211_get_bitrate(const char *ifname, int *buf)
754 {
755 struct nl80211_rssi_rate rr;
756
757 if (!wext_get_bitrate(ifname, buf))
758 return 0;
759
760 nl80211_fill_signal(ifname, &rr);
761
762 if (rr.rate)
763 {
764 *buf = (rr.rate * 100);
765 return 0;
766 }
767
768 return -1;
769 }
770
771 int nl80211_get_signal(const char *ifname, int *buf)
772 {
773 struct nl80211_rssi_rate rr;
774
775 if (!wext_get_signal(ifname, buf))
776 return 0;
777
778 nl80211_fill_signal(ifname, &rr);
779
780 if (rr.rssi)
781 {
782 *buf = rr.rssi;
783 return 0;
784 }
785
786 return -1;
787 }
788
789 static int nl80211_get_noise_cb(struct nl_msg *msg, void *arg)
790 {
791 int8_t *noise = arg;
792 struct nlattr **tb = nl80211_parse(msg);
793 struct nlattr *si[NL80211_SURVEY_INFO_MAX + 1];
794
795 static struct nla_policy sp[NL80211_SURVEY_INFO_MAX + 1] = {
796 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
797 [NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 },
798 };
799
800 if (!tb[NL80211_ATTR_SURVEY_INFO])
801 return NL_SKIP;
802
803 if (nla_parse_nested(si, NL80211_SURVEY_INFO_MAX,
804 tb[NL80211_ATTR_SURVEY_INFO], sp))
805 return NL_SKIP;
806
807 if (!si[NL80211_SURVEY_INFO_NOISE])
808 return NL_SKIP;
809
810 if (!*noise || si[NL80211_SURVEY_INFO_IN_USE])
811 *noise = (int8_t)nla_get_u8(si[NL80211_SURVEY_INFO_NOISE]);
812
813 return NL_SKIP;
814 }
815
816
817 int nl80211_get_noise(const char *ifname, int *buf)
818 {
819 int8_t noise;
820 struct nl80211_msg_conveyor *req;
821
822 req = nl80211_msg(ifname, NL80211_CMD_GET_SURVEY, NLM_F_DUMP);
823 if (req)
824 {
825 noise = 0;
826
827 nl80211_send(req, nl80211_get_noise_cb, &noise);
828 nl80211_free(req);
829
830 if (noise)
831 {
832 *buf = noise;
833 return 0;
834 }
835 }
836
837 return -1;
838 }
839
840 int nl80211_get_quality(const char *ifname, int *buf)
841 {
842 int signal;
843
844 if (wext_get_quality(ifname, buf))
845 {
846 *buf = 0;
847
848 if (!nl80211_get_signal(ifname, &signal))
849 {
850 /* A positive signal level is usually just a quality
851 * value, pass through as-is */
852 if (signal >= 0)
853 {
854 *buf = signal;
855 }
856
857 /* The cfg80211 wext compat layer assumes a signal range
858 * of -110 dBm to -40 dBm, the quality value is derived
859 * by adding 110 to the signal level */
860 else
861 {
862 if (signal < -110)
863 signal = -110;
864 else if (signal > -40)
865 signal = -40;
866
867 *buf = (signal + 110);
868 }
869 }
870 }
871
872 return 0;
873 }
874
875 int nl80211_get_quality_max(const char *ifname, int *buf)
876 {
877 if (wext_get_quality_max(ifname, buf))
878 /* The cfg80211 wext compat layer assumes a maximum
879 * quality of 70 */
880 *buf = 70;
881
882 return 0;
883 }
884
885 int nl80211_get_encryption(const char *ifname, char *buf)
886 {
887 int i;
888 char k[9];
889 char *val, *res;
890 struct iwinfo_crypto_entry *c = (struct iwinfo_crypto_entry *)buf;
891
892 /* WPA supplicant */
893 if( (res = nl80211_wpactl_info(ifname, "STATUS", NULL)) &&
894 (val = nl80211_getval(NULL, res, "pairwise_cipher")) )
895 {
896 /* WEP */
897 if (strstr(val, "WEP"))
898 {
899 if (strstr(val, "WEP-40"))
900 c->pair_ciphers |= IWINFO_CIPHER_WEP40;
901
902 else if (strstr(val, "WEP-104"))
903 c->pair_ciphers |= IWINFO_CIPHER_WEP104;
904
905 c->enabled = 1;
906 c->group_ciphers = c->pair_ciphers;
907
908 c->auth_suites |= IWINFO_KMGMT_NONE;
909 c->auth_algs |= IWINFO_AUTH_OPEN; /* XXX: assumption */
910 }
911
912 /* WPA */
913 else
914 {
915 if (strstr(val, "TKIP"))
916 c->pair_ciphers |= IWINFO_CIPHER_TKIP;
917
918 else if (strstr(val, "CCMP"))
919 c->pair_ciphers |= IWINFO_CIPHER_CCMP;
920
921 else if (strstr(val, "NONE"))
922 c->pair_ciphers |= IWINFO_CIPHER_NONE;
923
924 else if (strstr(val, "WEP-40"))
925 c->pair_ciphers |= IWINFO_CIPHER_WEP40;
926
927 else if (strstr(val, "WEP-104"))
928 c->pair_ciphers |= IWINFO_CIPHER_WEP104;
929
930
931 if ((val = nl80211_getval(NULL, res, "group_cipher")))
932 {
933 if (strstr(val, "TKIP"))
934 c->group_ciphers |= IWINFO_CIPHER_TKIP;
935
936 else if (strstr(val, "CCMP"))
937 c->group_ciphers |= IWINFO_CIPHER_CCMP;
938
939 else if (strstr(val, "NONE"))
940 c->group_ciphers |= IWINFO_CIPHER_NONE;
941
942 else if (strstr(val, "WEP-40"))
943 c->group_ciphers |= IWINFO_CIPHER_WEP40;
944
945 else if (strstr(val, "WEP-104"))
946 c->group_ciphers |= IWINFO_CIPHER_WEP104;
947 }
948
949
950 if ((val = nl80211_getval(NULL, res, "key_mgmt")))
951 {
952 if (strstr(val, "WPA2"))
953 c->wpa_version = 2;
954
955 else if (strstr(val, "WPA"))
956 c->wpa_version = 1;
957
958
959 if (strstr(val, "PSK"))
960 c->auth_suites |= IWINFO_KMGMT_PSK;
961
962 else if (strstr(val, "EAP") || strstr(val, "802.1X"))
963 c->auth_suites |= IWINFO_KMGMT_8021x;
964
965 else if (strstr(val, "NONE"))
966 c->auth_suites |= IWINFO_KMGMT_NONE;
967 }
968
969 c->enabled = (c->wpa_version && c->auth_suites) ? 1 : 0;
970 }
971
972 return 0;
973 }
974
975 /* Hostapd */
976 else if ((res = nl80211_hostapd_info(ifname)))
977 {
978 if ((val = nl80211_getval(ifname, res, "wpa")) != NULL)
979 c->wpa_version = atoi(val);
980
981 val = nl80211_getval(ifname, res, "wpa_key_mgmt");
982
983 if (!val || strstr(val, "PSK"))
984 c->auth_suites |= IWINFO_KMGMT_PSK;
985
986 if (val && strstr(val, "EAP"))
987 c->auth_suites |= IWINFO_KMGMT_8021x;
988
989 if (val && strstr(val, "NONE"))
990 c->auth_suites |= IWINFO_KMGMT_NONE;
991
992 if ((val = nl80211_getval(ifname, res, "wpa_pairwise")) != NULL)
993 {
994 if (strstr(val, "TKIP"))
995 c->pair_ciphers |= IWINFO_CIPHER_TKIP;
996
997 if (strstr(val, "CCMP"))
998 c->pair_ciphers |= IWINFO_CIPHER_CCMP;
999
1000 if (strstr(val, "NONE"))
1001 c->pair_ciphers |= IWINFO_CIPHER_NONE;
1002 }
1003
1004 if ((val = nl80211_getval(ifname, res, "auth_algs")) != NULL)
1005 {
1006 switch(atoi(val)) {
1007 case 1:
1008 c->auth_algs |= IWINFO_AUTH_OPEN;
1009 break;
1010
1011 case 2:
1012 c->auth_algs |= IWINFO_AUTH_SHARED;
1013 break;
1014
1015 case 3:
1016 c->auth_algs |= IWINFO_AUTH_OPEN;
1017 c->auth_algs |= IWINFO_AUTH_SHARED;
1018 break;
1019
1020 default:
1021 break;
1022 }
1023
1024 for( i = 0; i < 4; i++ )
1025 {
1026 snprintf(k, sizeof(k), "wep_key%d", i);
1027
1028 if ((val = nl80211_getval(ifname, res, k)))
1029 {
1030 if ((strlen(val) == 5) || (strlen(val) == 10))
1031 c->pair_ciphers |= IWINFO_CIPHER_WEP40;
1032
1033 else if ((strlen(val) == 13) || (strlen(val) == 26))
1034 c->pair_ciphers |= IWINFO_CIPHER_WEP104;
1035 }
1036 }
1037 }
1038
1039 c->group_ciphers = c->pair_ciphers;
1040 c->enabled = (c->wpa_version || c->pair_ciphers) ? 1 : 0;
1041
1042 return 0;
1043 }
1044
1045 return -1;
1046 }
1047
1048
1049 static int nl80211_get_assoclist_cb(struct nl_msg *msg, void *arg)
1050 {
1051 struct nl80211_array_buf *arr = arg;
1052 struct iwinfo_assoclist_entry *e = arr->buf;
1053 struct nlattr **attr = nl80211_parse(msg);
1054 struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
1055
1056 static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
1057 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32 },
1058 [NL80211_STA_INFO_RX_BYTES] = { .type = NLA_U32 },
1059 [NL80211_STA_INFO_TX_BYTES] = { .type = NLA_U32 },
1060 [NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 },
1061 [NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 },
1062 [NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 },
1063 [NL80211_STA_INFO_TX_BITRATE] = { .type = NLA_NESTED },
1064 [NL80211_STA_INFO_LLID] = { .type = NLA_U16 },
1065 [NL80211_STA_INFO_PLID] = { .type = NLA_U16 },
1066 [NL80211_STA_INFO_PLINK_STATE] = { .type = NLA_U8 },
1067 };
1068
1069 /* advance to end of array */
1070 e += arr->count;
1071
1072 if (attr[NL80211_ATTR_MAC])
1073 memcpy(e->mac, nla_data(attr[NL80211_ATTR_MAC]), 6);
1074
1075 if (attr[NL80211_ATTR_STA_INFO])
1076 {
1077 if (!nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
1078 attr[NL80211_ATTR_STA_INFO], stats_policy))
1079 {
1080 if (sinfo[NL80211_STA_INFO_SIGNAL])
1081 e->signal = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
1082 }
1083 }
1084
1085 e->noise = 0; /* filled in by caller */
1086 arr->count++;
1087
1088 return NL_SKIP;
1089 }
1090
1091 int nl80211_get_assoclist(const char *ifname, char *buf, int *len)
1092 {
1093 DIR *d;
1094 int i, noise = 0;
1095 struct dirent *de;
1096 struct nl80211_msg_conveyor *req;
1097 struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
1098 struct iwinfo_assoclist_entry *e;
1099
1100 if ((d = opendir("/sys/class/net")) != NULL)
1101 {
1102 while ((de = readdir(d)) != NULL)
1103 {
1104 if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
1105 (!de->d_name[strlen(ifname)] ||
1106 !strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
1107 {
1108 req = nl80211_msg(de->d_name, NL80211_CMD_GET_STATION,
1109 NLM_F_DUMP);
1110
1111 if (req)
1112 {
1113 nl80211_send(req, nl80211_get_assoclist_cb, &arr);
1114 nl80211_free(req);
1115 }
1116
1117 break;
1118 }
1119 }
1120
1121 closedir(d);
1122
1123 if (!nl80211_get_noise(ifname, &noise))
1124 for (i = 0, e = arr.buf; i < arr.count; i++, e++)
1125 e->noise = noise;
1126
1127 *len = (arr.count * sizeof(struct iwinfo_assoclist_entry));
1128 return 0;
1129 }
1130
1131 return -1;
1132 }
1133
1134 static int nl80211_get_txpwrlist_cb(struct nl_msg *msg, void *arg)
1135 {
1136 int *dbm_max = arg;
1137 int ch_cur, ch_cmp, bands_remain, freqs_remain;
1138
1139 struct nlattr **attr = nl80211_parse(msg);
1140 struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
1141 struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
1142 struct nlattr *band, *freq;
1143
1144 static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
1145 [NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 },
1146 [NL80211_FREQUENCY_ATTR_DISABLED] = { .type = NLA_FLAG },
1147 [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
1148 [NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG },
1149 [NL80211_FREQUENCY_ATTR_RADAR] = { .type = NLA_FLAG },
1150 [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32 },
1151 };
1152
1153 ch_cur = *dbm_max; /* value int* is initialized with channel by caller */
1154 *dbm_max = -1;
1155
1156 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
1157 {
1158 nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
1159 nla_len(band), NULL);
1160
1161 nla_for_each_nested(freq,
1162 bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
1163 {
1164 nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
1165 nla_data(freq), nla_len(freq), freq_policy);
1166
1167 ch_cmp = nl80211_freq2channel(
1168 nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]));
1169
1170 if( (!ch_cur || (ch_cmp == ch_cur)) &&
1171 freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER] )
1172 {
1173 *dbm_max = (int)(0.01 * nla_get_u32(
1174 freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]));
1175
1176 break;
1177 }
1178 }
1179 }
1180
1181 return NL_SKIP;
1182 }
1183
1184 int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len)
1185 {
1186 int ch_cur;
1187 int dbm_max = -1, dbm_cur, dbm_cnt;
1188 struct nl80211_msg_conveyor *req;
1189 struct iwinfo_txpwrlist_entry entry;
1190
1191 if (nl80211_get_channel(ifname, &ch_cur))
1192 ch_cur = 0;
1193
1194 req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
1195 if (req)
1196 {
1197 /* initialize the value pointer with channel for callback */
1198 dbm_max = ch_cur;
1199
1200 nl80211_send(req, nl80211_get_txpwrlist_cb, &dbm_max);
1201 nl80211_free(req);
1202 }
1203
1204 if (dbm_max > -1)
1205 {
1206 for (dbm_cur = 0, dbm_cnt = 0;
1207 dbm_cur < dbm_max;
1208 dbm_cur++, dbm_cnt++)
1209 {
1210 entry.dbm = dbm_cur;
1211 entry.mw = iwinfo_dbm2mw(dbm_cur);
1212
1213 memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
1214 }
1215
1216 entry.dbm = dbm_max;
1217 entry.mw = iwinfo_dbm2mw(dbm_max);
1218
1219 memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
1220 dbm_cnt++;
1221
1222 *len = dbm_cnt * sizeof(entry);
1223 return 0;
1224 }
1225
1226 return -1;
1227 }
1228
1229 static void nl80211_get_scancrypto(const char *spec,
1230 struct iwinfo_crypto_entry *c)
1231 {
1232 if (strstr(spec, "WPA") || strstr(spec, "WEP"))
1233 {
1234 c->enabled = 1;
1235
1236 if (strstr(spec, "WPA2-") && strstr(spec, "WPA-"))
1237 c->wpa_version = 3;
1238
1239 else if (strstr(spec, "WPA2"))
1240 c->wpa_version = 2;
1241
1242 else if (strstr(spec, "WPA"))
1243 c->wpa_version = 1;
1244
1245 else if (strstr(spec, "WEP"))
1246 c->auth_algs = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
1247
1248
1249 if (strstr(spec, "PSK"))
1250 c->auth_suites |= IWINFO_KMGMT_PSK;
1251
1252 if (strstr(spec, "802.1X") || strstr(spec, "EAP"))
1253 c->auth_suites |= IWINFO_KMGMT_8021x;
1254
1255 if (strstr(spec, "WPA-NONE"))
1256 c->auth_suites |= IWINFO_KMGMT_NONE;
1257
1258
1259 if (strstr(spec, "TKIP"))
1260 c->pair_ciphers |= IWINFO_CIPHER_TKIP;
1261
1262 if (strstr(spec, "CCMP"))
1263 c->pair_ciphers |= IWINFO_CIPHER_CCMP;
1264
1265 if (strstr(spec, "WEP-40"))
1266 c->pair_ciphers |= IWINFO_CIPHER_WEP40;
1267
1268 if (strstr(spec, "WEP-104"))
1269 c->pair_ciphers |= IWINFO_CIPHER_WEP104;
1270
1271 c->group_ciphers = c->pair_ciphers;
1272 }
1273 else
1274 {
1275 c->enabled = 0;
1276 }
1277 }
1278
1279 int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
1280 {
1281 int freq, rssi, qmax, count;
1282 char *res;
1283 char ssid[128] = { 0 };
1284 char bssid[18] = { 0 };
1285 char cipher[256] = { 0 };
1286
1287 /* Got a radioX pseudo interface, find some interface on it or create one */
1288 if (!strncmp(ifname, "radio", 5))
1289 {
1290 /* Reuse existing interface */
1291 if ((res = nl80211_phy2ifname(ifname)) != NULL)
1292 {
1293 return nl80211_get_scanlist(res, buf, len);
1294 }
1295
1296 /* Need to spawn a temporary iface for scanning */
1297 else if ((res = nl80211_ifadd(ifname)) != NULL)
1298 {
1299 count = nl80211_get_scanlist(res, buf, len);
1300 nl80211_ifdel(res);
1301 return count;
1302 }
1303 }
1304
1305 struct iwinfo_scanlist_entry *e = (struct iwinfo_scanlist_entry *)buf;
1306
1307 /* WPA supplicant */
1308 if ((res = nl80211_wpactl_info(ifname, "SCAN", "CTRL-EVENT-SCAN-RESULTS")))
1309 {
1310 if ((res = nl80211_wpactl_info(ifname, "SCAN_RESULTS", NULL)))
1311 {
1312 nl80211_get_quality_max(ifname, &qmax);
1313
1314 /* skip header line */
1315 while( *res++ != '\n' );
1316
1317 count = 0;
1318
1319 while( sscanf(res, "%17s %d %d %255s%*[ \t]%127[^\n]\n",
1320 bssid, &freq, &rssi, cipher, ssid) > 0 )
1321 {
1322 /* BSSID */
1323 e->mac[0] = strtol(&bssid[0], NULL, 16);
1324 e->mac[1] = strtol(&bssid[3], NULL, 16);
1325 e->mac[2] = strtol(&bssid[6], NULL, 16);
1326 e->mac[3] = strtol(&bssid[9], NULL, 16);
1327 e->mac[4] = strtol(&bssid[12], NULL, 16);
1328 e->mac[5] = strtol(&bssid[15], NULL, 16);
1329
1330 /* SSID */
1331 memcpy(e->ssid, ssid,
1332 min(strlen(ssid), sizeof(e->ssid) - 1));
1333
1334 /* Mode (assume master) */
1335 sprintf((char *)e->mode, "Master");
1336
1337 /* Channel */
1338 e->channel = nl80211_freq2channel(freq);
1339
1340 /* Signal */
1341 e->signal = rssi;
1342
1343 /* Quality */
1344 if (rssi < 0)
1345 {
1346 /* The cfg80211 wext compat layer assumes a signal range
1347 * of -110 dBm to -40 dBm, the quality value is derived
1348 * by adding 110 to the signal level */
1349 if (rssi < -110)
1350 rssi = -110;
1351 else if (rssi > -40)
1352 rssi = -40;
1353
1354 e->quality = (rssi + 110);
1355 }
1356 else
1357 {
1358 e->quality = rssi;
1359 }
1360
1361 /* Max. Quality */
1362 e->quality_max = qmax;
1363
1364 /* Crypto */
1365 nl80211_get_scancrypto(cipher, &e->crypto);
1366
1367 /* advance to next line */
1368 while( *res && *res++ != '\n' );
1369
1370 count++;
1371 e++;
1372
1373 memset(ssid, 0, sizeof(ssid));
1374 memset(bssid, 0, sizeof(bssid));
1375 memset(cipher, 0, sizeof(cipher));
1376 }
1377
1378 *len = count * sizeof(struct iwinfo_scanlist_entry);
1379 return 0;
1380 }
1381 }
1382
1383 /* AP scan */
1384 else
1385 {
1386 /* Got a temp interface, don't create yet another one */
1387 if (!strncmp(ifname, "tmp.", 4))
1388 {
1389 if (!iwinfo_ifup(ifname))
1390 return -1;
1391
1392 wext_get_scanlist(ifname, buf, len);
1393 iwinfo_ifdown(ifname);
1394 return 0;
1395 }
1396
1397 /* Spawn a new scan interface */
1398 else
1399 {
1400 if (!(res = nl80211_ifadd(ifname)))
1401 goto out;
1402
1403 if (!iwinfo_ifmac(res))
1404 goto out;
1405
1406 /* if we can take the new interface up, the driver supports an
1407 * additional interface and there's no need to tear down the ap */
1408 if (iwinfo_ifup(res))
1409 {
1410 wext_get_scanlist(res, buf, len);
1411 iwinfo_ifdown(res);
1412 }
1413
1414 /* driver cannot create secondary interface, take down ap
1415 * during scan */
1416 else if (iwinfo_ifdown(ifname) && iwinfo_ifup(res))
1417 {
1418 wext_get_scanlist(res, buf, len);
1419 iwinfo_ifdown(res);
1420 iwinfo_ifup(ifname);
1421 nl80211_hostapd_hup(ifname);
1422 }
1423
1424 out:
1425 nl80211_ifdel(res);
1426 return 0;
1427 }
1428 }
1429
1430 return -1;
1431 }
1432
1433 static int nl80211_get_freqlist_cb(struct nl_msg *msg, void *arg)
1434 {
1435 int bands_remain, freqs_remain;
1436
1437 struct nl80211_array_buf *arr = arg;
1438 struct iwinfo_freqlist_entry *e = arr->buf;
1439
1440 struct nlattr **attr = nl80211_parse(msg);
1441 struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
1442 struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
1443 struct nlattr *band, *freq;
1444
1445 static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
1446 [NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 },
1447 [NL80211_FREQUENCY_ATTR_DISABLED] = { .type = NLA_FLAG },
1448 [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
1449 [NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG },
1450 [NL80211_FREQUENCY_ATTR_RADAR] = { .type = NLA_FLAG },
1451 [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32 },
1452 };
1453
1454 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
1455 {
1456 nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
1457 nla_len(band), NULL);
1458
1459 nla_for_each_nested(freq,
1460 bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
1461 {
1462 nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
1463 nla_data(freq), nla_len(freq), NULL);
1464
1465 if( !freqs[NL80211_FREQUENCY_ATTR_FREQ] ||
1466 freqs[NL80211_FREQUENCY_ATTR_DISABLED] )
1467 continue;
1468
1469 e->mhz = nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]);
1470 e->channel = nl80211_freq2channel(e->mhz);
1471
1472 e->restricted = (
1473 freqs[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] ||
1474 freqs[NL80211_FREQUENCY_ATTR_NO_IBSS] ||
1475 freqs[NL80211_FREQUENCY_ATTR_RADAR]
1476 ) ? 1 : 0;
1477
1478 e++;
1479 arr->count++;
1480 }
1481 }
1482
1483 return NL_SKIP;
1484 }
1485
1486 int nl80211_get_freqlist(const char *ifname, char *buf, int *len)
1487 {
1488 struct nl80211_msg_conveyor *req;
1489 struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
1490
1491 req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
1492 if (req)
1493 {
1494 nl80211_send(req, nl80211_get_freqlist_cb, &arr);
1495 nl80211_free(req);
1496 }
1497
1498 if (arr.count > 0)
1499 {
1500 *len = arr.count * sizeof(struct iwinfo_freqlist_entry);
1501 return 0;
1502 }
1503
1504 return -1;
1505 }
1506
1507 static int nl80211_get_country_cb(struct nl_msg *msg, void *arg)
1508 {
1509 char *buf = arg;
1510 struct nlattr **attr = nl80211_parse(msg);
1511
1512 if (attr[NL80211_ATTR_REG_ALPHA2])
1513 memcpy(buf, nla_data(attr[NL80211_ATTR_REG_ALPHA2]), 2);
1514 else
1515 buf[0] = 0;
1516
1517 return NL_SKIP;
1518 }
1519
1520 int nl80211_get_country(const char *ifname, char *buf)
1521 {
1522 int rv = -1;
1523 struct nl80211_msg_conveyor *req;
1524
1525 req = nl80211_msg(ifname, NL80211_CMD_GET_REG, 0);
1526 if (req)
1527 {
1528 nl80211_send(req, nl80211_get_country_cb, buf);
1529 nl80211_free(req);
1530
1531 if (buf[0])
1532 rv = 0;
1533 }
1534
1535 return rv;
1536 }
1537
1538 int nl80211_get_countrylist(const char *ifname, char *buf, int *len)
1539 {
1540 int i, count;
1541 struct iwinfo_country_entry *e = (struct iwinfo_country_entry *)buf;
1542 const struct iwinfo_iso3166_label *l;
1543
1544 for( l = IWINFO_ISO3166_NAMES, count = 0; l->iso3166; l++, e++, count++ )
1545 {
1546 e->iso3166 = l->iso3166;
1547 e->ccode[0] = (l->iso3166 / 256);
1548 e->ccode[1] = (l->iso3166 % 256);
1549 }
1550
1551 *len = (count * sizeof(struct iwinfo_country_entry));
1552 return 0;
1553 }
1554
1555 static int nl80211_get_hwmodelist_cb(struct nl_msg *msg, void *arg)
1556 {
1557 int *modes = arg;
1558 int bands_remain, freqs_remain;
1559 uint16_t caps = 0;
1560 struct nlattr **attr = nl80211_parse(msg);
1561 struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
1562 struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
1563 struct nlattr *band, *freq;
1564
1565 *modes = 0;
1566
1567 if (attr[NL80211_ATTR_WIPHY_BANDS])
1568 {
1569 nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
1570 {
1571 nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
1572 nla_len(band), NULL);
1573
1574 if (bands[NL80211_BAND_ATTR_HT_CAPA])
1575 caps = nla_get_u16(bands[NL80211_BAND_ATTR_HT_CAPA]);
1576
1577 /* Treat any nonzero capability as 11n */
1578 if (caps > 0)
1579 *modes |= IWINFO_80211_N;
1580
1581 nla_for_each_nested(freq,
1582 bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
1583 {
1584 nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
1585 nla_data(freq), nla_len(freq), NULL);
1586
1587 if (!freqs[NL80211_FREQUENCY_ATTR_FREQ])
1588 continue;
1589
1590 if (nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]) < 2485)
1591 {
1592 *modes |= IWINFO_80211_B;
1593 *modes |= IWINFO_80211_G;
1594 }
1595 else
1596 {
1597 *modes |= IWINFO_80211_A;
1598 }
1599 }
1600 }
1601 }
1602
1603 return NL_SKIP;
1604 }
1605
1606 int nl80211_get_hwmodelist(const char *ifname, int *buf)
1607 {
1608 struct nl80211_msg_conveyor *req;
1609
1610 req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
1611 if (req)
1612 {
1613 nl80211_send(req, nl80211_get_hwmodelist_cb, buf);
1614 nl80211_free(req);
1615 }
1616
1617 return *buf ? 0 : -1;
1618 }
1619
1620 int nl80211_get_mbssid_support(const char *ifname, int *buf)
1621 {
1622 /* Test whether we can create another interface */
1623 char *nif = nl80211_ifadd(ifname);
1624
1625 if (nif)
1626 {
1627 *buf = (iwinfo_ifmac(nif) && iwinfo_ifup(nif));
1628
1629 iwinfo_ifdown(nif);
1630 nl80211_ifdel(nif);
1631
1632 return 0;
1633 }
1634
1635 return -1;
1636 }
1637
1638 int nl80211_get_hardware_id(const char *ifname, char *buf)
1639 {
1640 int rv;
1641 char *res;
1642
1643 /* Got a radioX pseudo interface, find some interface on it or create one */
1644 if (!strncmp(ifname, "radio", 5))
1645 {
1646 /* Reuse existing interface */
1647 if ((res = nl80211_phy2ifname(ifname)) != NULL)
1648 {
1649 return wext_get_hardware_id(res, buf);
1650 }
1651
1652 /* Need to spawn a temporary iface for finding IDs */
1653 else if ((res = nl80211_ifadd(ifname)) != NULL)
1654 {
1655 rv = wext_get_hardware_id(res, buf);
1656 nl80211_ifdel(res);
1657 return rv;
1658 }
1659 }
1660
1661 return wext_get_hardware_id(ifname, buf);
1662 }
1663
1664 static const struct iwinfo_hardware_entry *
1665 nl80211_get_hardware_entry(const char *ifname)
1666 {
1667 struct iwinfo_hardware_id id;
1668
1669 if (nl80211_get_hardware_id(ifname, (char *)&id))
1670 return NULL;
1671
1672 return iwinfo_hardware(&id);
1673 }
1674
1675 int nl80211_get_hardware_name(const char *ifname, char *buf)
1676 {
1677 const struct iwinfo_hardware_entry *hw;
1678
1679 if (!(hw = nl80211_get_hardware_entry(ifname)))
1680 sprintf(buf, "Generic MAC80211");
1681 else
1682 sprintf(buf, "%s %s", hw->vendor_name, hw->device_name);
1683
1684 return 0;
1685 }
1686
1687 int nl80211_get_txpower_offset(const char *ifname, int *buf)
1688 {
1689 const struct iwinfo_hardware_entry *hw;
1690
1691 if (!(hw = nl80211_get_hardware_entry(ifname)))
1692 return -1;
1693
1694 *buf = hw->txpower_offset;
1695 return 0;
1696 }
1697
1698 int nl80211_get_frequency_offset(const char *ifname, int *buf)
1699 {
1700 const struct iwinfo_hardware_entry *hw;
1701
1702 if (!(hw = nl80211_get_hardware_entry(ifname)))
1703 return -1;
1704
1705 *buf = hw->frequency_offset;
1706 return 0;
1707 }
OpenWrt Source Repository