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[project/luci.git] / contrib / 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;
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 if( genl_ctrl_alloc_cache(nls->nl_sock, &nls->nl_cache)) {
56 err = -ENOMEM;
57 goto err;
58 }
59
60 nls->nl80211 = genl_ctrl_search_by_name(nls->nl_cache, "nl80211");
61 if( !nls->nl80211 )
62 {
63 err = -ENOENT;
64 goto err;
65 }
66 }
67
68 return 0;
69
70
71 err:
72 if( nls && nls->nl_sock )
73 nl_socket_free(nls->nl_sock);
74
75 if( nls && nls->nl_cache )
76 nl_cache_free(nls->nl_cache);
77
78 if( nls )
79 free(nls);
80
81 nls = NULL;
82
83 return err;
84 }
85
86 static int nl80211_msg_error(struct sockaddr_nl *nla,
87 struct nlmsgerr *err, void *arg)
88 {
89 int *ret = arg;
90 *ret = err->error;
91 return NL_STOP;
92 }
93
94 static int nl80211_msg_finish(struct nl_msg *msg, void *arg)
95 {
96 int *ret = arg;
97 *ret = 0;
98 return NL_SKIP;
99 }
100
101 static int nl80211_msg_ack(struct nl_msg *msg, void *arg)
102 {
103 int *ret = arg;
104 *ret = 0;
105 return NL_STOP;
106 }
107
108 static int nl80211_msg_response(struct nl_msg *msg, void *arg)
109 {
110 struct nl80211_msg_conveyor *cv = arg;
111
112 nlmsg_get(msg);
113
114 cv->msg = msg;
115 cv->hdr = nlmsg_data(nlmsg_hdr(cv->msg));
116
117 nla_parse(cv->attr, NL80211_ATTR_MAX,
118 genlmsg_attrdata(cv->hdr, 0),
119 genlmsg_attrlen(cv->hdr, 0), NULL);
120
121 return NL_SKIP;
122 }
123
124 static void nl80211_free(struct nl80211_msg_conveyor *cv)
125 {
126 if( cv && cv->cb )
127 nl_cb_put(cv->cb);
128
129 if( cv && cv->msg )
130 nlmsg_free(cv->msg);
131 }
132
133 static struct nl80211_msg_conveyor * nl80211_msg(const char *ifname, int cmd, int flags)
134 {
135 static struct nl80211_msg_conveyor cv;
136
137 int ifidx;
138 struct nl_msg *req = NULL;
139 struct nl_cb *cb = NULL;
140
141 if( nl80211_init() < 0 )
142 goto err;
143
144 if( !strncmp(ifname, "mon.", 4) )
145 ifidx = if_nametoindex(&ifname[4]);
146 else
147 ifidx = if_nametoindex(ifname);
148
149 if( ifidx < 0 )
150 return NULL;
151
152 req = nlmsg_alloc();
153 if( !req )
154 goto err;
155
156 cb = nl_cb_alloc(NL_CB_DEFAULT);
157 if( !cb )
158 goto err;
159
160 genlmsg_put(req, 0, 0, genl_family_get_id(nls->nl80211), 0,
161 flags, cmd, 0);
162
163 NLA_PUT_U32(req, NL80211_ATTR_IFINDEX, ifidx);
164
165 nlmsg_get(req);
166
167 cv.msg = req;
168 cv.cb = cb;
169 cv.custom_cb = 0;
170
171 return &cv;
172
173 err:
174 nla_put_failure:
175 if( cb )
176 nl_cb_put(cb);
177
178 if( req )
179 nlmsg_free(req);
180
181 return NULL;
182 }
183
184 static void nl80211_cb(struct nl80211_msg_conveyor *cv,
185 int (*cb)(struct nl_msg *, void *), void *arg)
186 {
187 cv->custom_cb = 1;
188 nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, arg);
189 }
190
191 static struct nl80211_msg_conveyor * nl80211_send(struct nl80211_msg_conveyor *cv)
192 {
193 static struct nl80211_msg_conveyor rcv;
194 int err = 1;
195
196 if( !cv->custom_cb )
197 nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, nl80211_msg_response, &rcv);
198
199 if( nl_send_auto_complete(nls->nl_sock, cv->msg) < 0 )
200 goto err;
201
202 nl_cb_err(cv->cb, NL_CB_CUSTOM, nl80211_msg_error, &err);
203 nl_cb_set(cv->cb, NL_CB_FINISH, NL_CB_CUSTOM, nl80211_msg_finish, &err);
204 nl_cb_set(cv->cb, NL_CB_ACK, NL_CB_CUSTOM, nl80211_msg_ack, &err);
205
206 while (err > 0)
207 nl_recvmsgs(nls->nl_sock, cv->cb);
208
209 return &rcv;
210
211 err:
212 nl_cb_put(cv->cb);
213 nlmsg_free(cv->msg);
214
215 return NULL;
216 }
217
218 static int nl80211_freq2channel(int freq)
219 {
220 if (freq == 2484)
221 return 14;
222
223 if (freq < 2484)
224 return (freq - 2407) / 5;
225
226 return (freq / 5) - 1000;
227 }
228
229 static char * nl80211_getval(const char *buf, const char *key)
230 {
231 int i, len;
232 char lkey[64] = { 0 };
233 const char *ln = buf;
234 static char lval[256] = { 0 };
235
236 for( i = 0, len = strlen(buf); i < len; i++ )
237 {
238 if( !lkey[0] && (buf[i] == ' ' || buf[i] == '\t') )
239 {
240 ln++;
241 }
242 else if( !lkey[0] && (buf[i] == '=') )
243 {
244 if( (&buf[i] - ln) > 0 )
245 memcpy(lkey, ln, min(sizeof(lkey) - 1, &buf[i] - ln));
246 }
247 else if( buf[i] == '\n' )
248 {
249 if( lkey[0] && !strcmp(lkey, key) )
250 {
251 memcpy(lval, ln + strlen(lkey) + 1,
252 min(sizeof(lval) - 1, &buf[i] - ln - strlen(lkey) - 1));
253
254 return lval;
255 }
256
257 ln = &buf[i+1];
258 memset(lkey, 0, sizeof(lkey));
259 memset(lval, 0, sizeof(lval));
260 }
261 }
262
263 return NULL;
264 }
265
266 static char * nl80211_ifname2phy(const char *ifname)
267 {
268 static char phy[32] = { 0 };
269 struct nl80211_msg_conveyor *req, *res;
270
271 req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
272 if( req )
273 {
274 res = nl80211_send(req);
275 if( res )
276 {
277 if( res->attr[NL80211_ATTR_WIPHY_NAME] )
278 {
279 snprintf(phy, sizeof(phy), "%s",
280 nla_get_string(res->attr[NL80211_ATTR_WIPHY_NAME]));
281 }
282 nl80211_free(res);
283 }
284 nl80211_free(req);
285 }
286
287 return phy[0] ? phy : NULL;
288 }
289
290 static char * nl80211_hostapd_info(const char *ifname)
291 {
292 char *phy;
293 char path[32] = { 0 };
294 static char buf[4096] = { 0 };
295 FILE *conf;
296
297 if( (phy = nl80211_ifname2phy(ifname)) != NULL )
298 {
299 snprintf(path, sizeof(path), "/var/run/hostapd-%s.conf", phy);
300
301 if( (conf = fopen(path, "r")) != NULL )
302 {
303 fread(buf, sizeof(buf) - 1, 1, conf);
304 fclose(conf);
305
306 return buf;
307 }
308 }
309
310 return NULL;
311 }
312
313 static char * nl80211_wpasupp_info(const char *ifname, const char *cmd)
314 {
315 int sock = -1, len;
316 char *rv = NULL;
317 size_t remote_length, local_length;
318 static char buffer[1024] = { 0 };
319
320 struct timeval tv = { 2, 0 };
321 struct sockaddr_un local = { 0 };
322 struct sockaddr_un remote = { 0 };
323
324 fd_set rfds;
325
326 sock = socket(PF_UNIX, SOCK_DGRAM, 0);
327 if( sock < 0 )
328 return NULL;
329
330 remote.sun_family = AF_UNIX;
331 remote_length = sizeof(remote.sun_family) + sprintf(remote.sun_path,
332 "/var/run/wpa_supplicant-%s/%s", ifname, ifname);
333
334 if( connect(sock, (struct sockaddr *) &remote, remote_length) )
335 goto out;
336
337 local.sun_family = AF_UNIX;
338 local_length = sizeof(local.sun_family) + sprintf(local.sun_path,
339 "/var/run/iwinfo-%s-%d", ifname, getpid());
340
341 if( bind(sock, (struct sockaddr *) &local, local_length) )
342 goto out;
343
344 send(sock, cmd, strlen(cmd), 0);
345
346 while( 1 )
347 {
348 FD_ZERO(&rfds);
349 FD_SET(sock, &rfds);
350
351 if( select(sock + 1, &rfds, NULL, NULL, &tv) < 0 )
352 goto out;
353
354 if( !FD_ISSET(sock, &rfds) )
355 break;
356
357 if( (len = recv(sock, buffer, sizeof(buffer), 0)) <= 0 )
358 goto out;
359
360 buffer[len] = 0;
361
362 if( buffer[0] != '<' )
363 break;
364 }
365
366 rv = buffer;
367
368 out:
369 close(sock);
370 unlink(local.sun_path);
371
372 return rv;
373 }
374
375
376 int nl80211_probe(const char *ifname)
377 {
378 return !!nl80211_ifname2phy(ifname);
379 }
380
381 int nl80211_get_mode(const char *ifname, char *buf)
382 {
383 return wext_get_mode(ifname, buf);
384 }
385
386 int nl80211_get_ssid(const char *ifname, char *buf)
387 {
388 char *ssid;
389
390 if( !wext_get_ssid(ifname, buf) )
391 {
392 return 0;
393 }
394 else if( (ssid = nl80211_hostapd_info(ifname)) &&
395 (ssid = nl80211_getval(ssid, "ssid")) )
396 {
397 memcpy(buf, ssid, strlen(ssid));
398 return 0;
399 }
400
401 return -1;
402 }
403
404 int nl80211_get_bssid(const char *ifname, char *buf)
405 {
406 char *bssid;
407 unsigned char mac[6];
408
409 if( !wext_get_bssid(ifname, buf) )
410 {
411 return 0;
412 }
413 else if( (bssid = nl80211_hostapd_info(ifname)) &&
414 (bssid = nl80211_getval(bssid, "bssid")) )
415 {
416 mac[0] = strtol(&bssid[0], NULL, 16);
417 mac[1] = strtol(&bssid[3], NULL, 16);
418 mac[2] = strtol(&bssid[6], NULL, 16);
419 mac[3] = strtol(&bssid[9], NULL, 16);
420 mac[4] = strtol(&bssid[12], NULL, 16);
421 mac[5] = strtol(&bssid[15], NULL, 16);
422
423 sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
424 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
425
426 return 0;
427 }
428
429 return -1;
430 }
431
432 int nl80211_get_channel(const char *ifname, int *buf)
433 {
434 return wext_get_channel(ifname, buf);
435 }
436
437 int nl80211_get_frequency(const char *ifname, int *buf)
438 {
439 return wext_get_frequency(ifname, buf);
440 }
441
442 int nl80211_get_txpower(const char *ifname, int *buf)
443 {
444 return wext_get_txpower(ifname, buf);
445 }
446
447
448 static int nl80211_get_signal_cb(struct nl_msg *msg, void *arg)
449 {
450 int8_t dbm;
451 int16_t mbit;
452 struct nl80211_rssi_rate *rr = arg;
453
454 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
455 struct nlattr *attr[NL80211_ATTR_MAX + 1];
456 struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
457 struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
458
459 static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
460 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32 },
461 [NL80211_STA_INFO_RX_BYTES] = { .type = NLA_U32 },
462 [NL80211_STA_INFO_TX_BYTES] = { .type = NLA_U32 },
463 [NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 },
464 [NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 },
465 [NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 },
466 [NL80211_STA_INFO_TX_BITRATE] = { .type = NLA_NESTED },
467 [NL80211_STA_INFO_LLID] = { .type = NLA_U16 },
468 [NL80211_STA_INFO_PLID] = { .type = NLA_U16 },
469 [NL80211_STA_INFO_PLINK_STATE] = { .type = NLA_U8 },
470 };
471
472 static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
473 [NL80211_RATE_INFO_BITRATE] = { .type = NLA_U16 },
474 [NL80211_RATE_INFO_MCS] = { .type = NLA_U8 },
475 [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG },
476 [NL80211_RATE_INFO_SHORT_GI] = { .type = NLA_FLAG },
477 };
478
479 nla_parse(attr, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
480 genlmsg_attrlen(gnlh, 0), NULL);
481
482 if( attr[NL80211_ATTR_STA_INFO] )
483 {
484 if( !nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
485 attr[NL80211_ATTR_STA_INFO], stats_policy) )
486 {
487 if( sinfo[NL80211_STA_INFO_SIGNAL] )
488 {
489 dbm = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
490 rr->rssi = rr->rssi ? (int8_t)((rr->rssi + dbm) / 2) : dbm;
491 }
492
493 if( sinfo[NL80211_STA_INFO_TX_BITRATE] )
494 {
495 if( !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
496 sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy) )
497 {
498 if( rinfo[NL80211_RATE_INFO_BITRATE] )
499 {
500 mbit = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]);
501 rr->rate = rr->rate
502 ? (int16_t)((rr->rate + mbit) / 2) : mbit;
503 }
504 }
505 }
506 }
507 }
508
509 return NL_SKIP;
510 }
511
512 int nl80211_get_bitrate(const char *ifname, int *buf)
513 {
514 struct nl80211_rssi_rate rr;
515 struct nl80211_msg_conveyor *req;
516
517 if( !wext_get_bitrate(ifname, buf) )
518 return 0;
519
520 req = nl80211_msg(ifname, NL80211_CMD_GET_STATION, NLM_F_DUMP);
521 if( req )
522 {
523 rr.rssi = 0;
524 rr.rate = 0;
525
526 nl80211_cb(req, nl80211_get_signal_cb, &rr);
527 nl80211_send(req);
528 nl80211_free(req);
529
530 if( rr.rate )
531 {
532 *buf = (rr.rate * 100);
533 return 0;
534 }
535 }
536
537 return -1;
538 }
539
540 int nl80211_get_signal(const char *ifname, int *buf)
541 {
542 struct nl80211_rssi_rate rr;
543 struct nl80211_msg_conveyor *req;
544
545 if( !wext_get_signal(ifname, buf) )
546 return 0;
547
548 req = nl80211_msg(ifname, NL80211_CMD_GET_STATION, NLM_F_DUMP);
549 if( req )
550 {
551 rr.rssi = 0;
552 rr.rate = 0;
553
554 nl80211_cb(req, nl80211_get_signal_cb, &rr);
555 nl80211_send(req);
556 nl80211_free(req);
557
558 if( rr.rssi )
559 {
560 *buf = rr.rssi;
561 return 0;
562 }
563 }
564
565 return -1;
566 }
567
568 int nl80211_get_noise(const char *ifname, int *buf)
569 {
570 struct nl80211_msg_conveyor *req, *res;
571 struct nlattr *si[NL80211_SURVEY_INFO_MAX + 1];
572
573 static struct nla_policy sp[NL80211_SURVEY_INFO_MAX + 1] = {
574 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
575 [NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 },
576 };
577
578 req = nl80211_msg(ifname, NL80211_CMD_GET_SURVEY, NLM_F_DUMP);
579 if( req )
580 {
581 res = nl80211_send(req);
582 if( res )
583 {
584 if( res->attr[NL80211_ATTR_SURVEY_INFO] )
585 {
586 if( !nla_parse_nested(si, NL80211_SURVEY_INFO_MAX,
587 res->attr[NL80211_ATTR_SURVEY_INFO], sp) )
588 {
589 *buf = (int8_t)nla_get_u8(si[NL80211_SURVEY_INFO_NOISE]);
590 return 0;
591 }
592 }
593 nl80211_free(res);
594 }
595 nl80211_free(req);
596 }
597
598 return -1;
599 }
600
601 int nl80211_get_quality(const char *ifname, int *buf)
602 {
603 int signal;
604
605 if( wext_get_quality(ifname, buf) )
606 {
607 *buf = 0;
608
609 if( !nl80211_get_signal(ifname, &signal) )
610 {
611 /* A positive signal level is usually just a quality
612 * value, pass through as-is */
613 if( signal >= 0 )
614 {
615 *buf = signal;
616 }
617
618 /* The cfg80211 wext compat layer assumes a signal range
619 * of -110 dBm to -40 dBm, the quality value is derived
620 * by adding 110 to the signal level */
621 else
622 {
623 if( signal < -110 )
624 signal = -110;
625 else if( signal > -40 )
626 signal = -40;
627
628 *buf = (signal + 110);
629 }
630 }
631 }
632
633 return 0;
634 }
635
636 int nl80211_get_quality_max(const char *ifname, int *buf)
637 {
638 if( wext_get_quality_max(ifname, buf) )
639 /* The cfg80211 wext compat layer assumes a maximum
640 * quality of 70 */
641 *buf = 70;
642
643 return 0;
644 }
645
646 int nl80211_get_encryption(const char *ifname, char *buf)
647 {
648 int i;
649 char k[9];
650 char *val, *res;
651 struct iwinfo_crypto_entry *c = (struct iwinfo_crypto_entry *)buf;
652
653 /* Hostapd */
654 if( (res = nl80211_hostapd_info(ifname)) &&
655 nl80211_getval(res, "interface") )
656 {
657 if( (val = nl80211_getval(res, "auth_algs")) && (val > 0) )
658 {
659 c->auth_suites |= IWINFO_KMGMT_NONE;
660
661 switch(atoi(val)) {
662 case 1:
663 c->auth_algs |= IWINFO_AUTH_OPEN;
664 break;
665
666 case 2:
667 c->auth_algs |= IWINFO_AUTH_SHARED;
668 break;
669
670 case 3:
671 c->auth_algs |= IWINFO_AUTH_OPEN;
672 c->auth_algs |= IWINFO_AUTH_SHARED;
673 break;
674
675 default:
676 break;
677 }
678
679 for( i = 0; i < 4; i++ )
680 {
681 snprintf(k, sizeof(k), "wep_key%d", i);
682
683 if( (val = nl80211_getval(res, k)) )
684 {
685 if( (strlen(val) == 5) || (strlen(val) == 10) )
686 c->pair_ciphers |= IWINFO_CIPHER_WEP40;
687
688 else if( (strlen(val) == 13) || (strlen(val) == 26) )
689 c->pair_ciphers |= IWINFO_CIPHER_WEP104;
690 }
691 }
692
693 c->group_ciphers = c->pair_ciphers;
694
695 return 0;
696 }
697
698
699 if( (val = nl80211_getval(res, "wpa")) != NULL )
700 c->wpa_version = atoi(val);
701
702
703 val = nl80211_getval(res, "wpa_key_mgmt");
704
705 if( !val || strstr(val, "PSK") )
706 c->auth_suites |= IWINFO_KMGMT_PSK;
707
708 if( val && strstr(val, "EAP") )
709 c->auth_suites |= IWINFO_KMGMT_8021x;
710
711 if( val && strstr(val, "NONE") )
712 c->auth_suites |= IWINFO_KMGMT_NONE;
713
714
715 if( (val = nl80211_getval(res, "wpa_pairwise")) != NULL )
716 {
717 if( strstr(val, "TKIP") )
718 c->pair_ciphers |= IWINFO_CIPHER_TKIP;
719
720 if( strstr(val, "CCMP") )
721 c->pair_ciphers |= IWINFO_CIPHER_CCMP;
722
723 if( strstr(val, "NONE") )
724 c->pair_ciphers |= IWINFO_CIPHER_NONE;
725 }
726
727
728 c->group_ciphers = c->pair_ciphers;
729 c->enabled = (c->auth_algs || c->auth_suites) ? 1 : 0;
730
731 return 0;
732 }
733
734 /* WPA supplicant */
735 else if( (res = nl80211_wpasupp_info(ifname, "STATUS")) &&
736 (val = nl80211_getval(res, "pairwise_cipher")) )
737 {
738 /* WEP */
739 if( strstr(val, "WEP") )
740 {
741 if( strstr(val, "WEP-40") )
742 c->pair_ciphers |= IWINFO_CIPHER_WEP40;
743
744 else if( strstr(val, "WEP-104") )
745 c->pair_ciphers |= IWINFO_CIPHER_WEP104;
746
747 c->enabled = 1;
748 c->group_ciphers = c->pair_ciphers;
749
750 c->auth_suites |= IWINFO_KMGMT_NONE;
751 c->auth_algs |= IWINFO_AUTH_OPEN; /* XXX: assumption */
752 }
753
754 /* WPA */
755 else
756 {
757 if( strstr(val, "TKIP") )
758 c->pair_ciphers |= IWINFO_CIPHER_TKIP;
759
760 else if( strstr(val, "CCMP") )
761 c->pair_ciphers |= IWINFO_CIPHER_CCMP;
762
763 else if( strstr(val, "NONE") )
764 c->pair_ciphers |= IWINFO_CIPHER_NONE;
765
766 else if( strstr(val, "WEP-40") )
767 c->pair_ciphers |= IWINFO_CIPHER_WEP40;
768
769 else if( strstr(val, "WEP-104") )
770 c->pair_ciphers |= IWINFO_CIPHER_WEP104;
771
772
773 if( (val = nl80211_getval(res, "group_cipher")) )
774 {
775 if( strstr(val, "TKIP") )
776 c->group_ciphers |= IWINFO_CIPHER_TKIP;
777
778 else if( strstr(val, "CCMP") )
779 c->group_ciphers |= IWINFO_CIPHER_CCMP;
780
781 else if( strstr(val, "NONE") )
782 c->group_ciphers |= IWINFO_CIPHER_NONE;
783
784 else if( strstr(val, "WEP-40") )
785 c->group_ciphers |= IWINFO_CIPHER_WEP40;
786
787 else if( strstr(val, "WEP-104") )
788 c->group_ciphers |= IWINFO_CIPHER_WEP104;
789 }
790
791
792 if( (val = nl80211_getval(res, "key_mgmt")) )
793 {
794 if( strstr(val, "WPA2") )
795 c->wpa_version = 2;
796
797 else if( strstr(val, "WPA") )
798 c->wpa_version = 1;
799
800
801 if( strstr(val, "PSK") )
802 c->auth_suites |= IWINFO_KMGMT_PSK;
803
804 else if( strstr(val, "EAP") || strstr(val, "802.1X") )
805 c->auth_suites |= IWINFO_KMGMT_8021x;
806
807 else if( strstr(val, "NONE") )
808 c->auth_suites |= IWINFO_KMGMT_NONE;
809 }
810
811 c->enabled = (c->wpa_version && c->auth_suites) ? 1 : 0;
812 }
813
814 return 0;
815 }
816
817 return -1;
818 }
819
820
821 static int nl80211_get_assoclist_cb(struct nl_msg *msg, void *arg)
822 {
823 struct nl80211_assoc_count *ac = arg;
824 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
825 struct nlattr *attr[NL80211_ATTR_MAX + 1];
826 struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
827
828 static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
829 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32 },
830 [NL80211_STA_INFO_RX_BYTES] = { .type = NLA_U32 },
831 [NL80211_STA_INFO_TX_BYTES] = { .type = NLA_U32 },
832 [NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 },
833 [NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 },
834 [NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 },
835 [NL80211_STA_INFO_TX_BITRATE] = { .type = NLA_NESTED },
836 [NL80211_STA_INFO_LLID] = { .type = NLA_U16 },
837 [NL80211_STA_INFO_PLID] = { .type = NLA_U16 },
838 [NL80211_STA_INFO_PLINK_STATE] = { .type = NLA_U8 },
839 };
840
841 nla_parse(attr, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
842 genlmsg_attrlen(gnlh, 0), NULL);
843
844 if( attr[NL80211_ATTR_MAC] )
845 memcpy(ac->entry->mac, nla_data(attr[NL80211_ATTR_MAC]), 6);
846
847 if( attr[NL80211_ATTR_STA_INFO] )
848 {
849 if( !nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
850 attr[NL80211_ATTR_STA_INFO], stats_policy) )
851 {
852 if( sinfo[NL80211_STA_INFO_SIGNAL] )
853 ac->entry->signal = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
854 }
855 }
856
857 ac->entry->noise = ac->noise;
858 ac->entry++;
859 ac->count++;
860
861 return NL_SKIP;
862 }
863
864 int nl80211_get_assoclist(const char *ifname, char *buf, int *len)
865 {
866 struct nl80211_assoc_count ac;
867 struct nl80211_msg_conveyor *req;
868
869 nl80211_get_noise(ifname, &ac.noise);
870
871 req = nl80211_msg(ifname, NL80211_CMD_GET_STATION, NLM_F_DUMP);
872 if( req )
873 {
874 ac.count = 0;
875 ac.entry = (struct iwinfo_assoclist_entry *)buf;
876
877 nl80211_cb(req, nl80211_get_assoclist_cb, &ac);
878 nl80211_send(req);
879 nl80211_free(req);
880
881 *len = (ac.count * sizeof(struct iwinfo_assoclist_entry));
882 return 0;
883 }
884
885 return -1;
886 }
887
888 int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len)
889 {
890 int ch_cur, ch_cmp, bands_remain, freqs_remain;
891 int dbm_max = -1, dbm_cur, dbm_cnt;
892 struct nl80211_msg_conveyor *req, *res;
893 struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
894 struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
895 struct nlattr *band, *freq;
896 struct iwinfo_txpwrlist_entry entry;
897
898 static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
899 [NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 },
900 [NL80211_FREQUENCY_ATTR_DISABLED] = { .type = NLA_FLAG },
901 [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
902 [NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG },
903 [NL80211_FREQUENCY_ATTR_RADAR] = { .type = NLA_FLAG },
904 [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32 },
905 };
906
907 if( nl80211_get_channel(ifname, &ch_cur) )
908 return -1;
909
910 req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
911 if( req )
912 {
913 res = nl80211_send(req);
914 if( res )
915 {
916 nla_for_each_nested(band,
917 res->attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
918 {
919 nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
920 nla_len(band), NULL);
921
922 nla_for_each_nested(freq,
923 bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
924 {
925 nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
926 nla_data(freq), nla_len(freq), freq_policy);
927
928 ch_cmp = nl80211_freq2channel(
929 nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]));
930
931 if( (ch_cmp == ch_cur) &&
932 freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER] )
933 {
934 dbm_max = (int)(0.01 * nla_get_u32(
935 freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]));
936
937 break;
938 }
939 }
940 }
941
942 nl80211_free(res);
943 }
944 nl80211_free(req);
945 }
946
947 if( dbm_max > -1 )
948 {
949 for( dbm_cur = 0, dbm_cnt = 0;
950 dbm_cur < dbm_max;
951 dbm_cur += 2, dbm_cnt++ )
952 {
953 entry.dbm = dbm_cur;
954 entry.mw = wext_dbm2mw(dbm_cur);
955
956 memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
957 }
958
959 entry.dbm = dbm_max;
960 entry.mw = wext_dbm2mw(dbm_max);
961
962 memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
963 dbm_cnt++;
964
965 *len = dbm_cnt * sizeof(entry);
966 return 0;
967 }
968
969 return -1;
970 }
971
972 static void nl80211_get_scancrypto(const char *spec,
973 struct iwinfo_crypto_entry *c)
974 {
975 if( strstr(spec, "OPEN") )
976 {
977 c->enabled = 0;
978 }
979 else
980 {
981 c->enabled = 1;
982
983 if( strstr(spec, "WPA2-") && strstr(spec, "WPA-") )
984 c->wpa_version = 3;
985
986 else if( strstr(spec, "WPA2") )
987 c->wpa_version = 2;
988
989 else if( strstr(spec, "WPA") )
990 c->wpa_version = 1;
991
992 else if( strstr(spec, "WEP") )
993 c->auth_algs = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
994
995
996 if( strstr(spec, "PSK") )
997 c->auth_suites |= IWINFO_KMGMT_PSK;
998
999 if( strstr(spec, "802.1X") || strstr(spec, "EAP") )
1000 c->auth_suites |= IWINFO_KMGMT_8021x;
1001
1002 if( strstr(spec, "WPA-NONE") )
1003 c->auth_suites |= IWINFO_KMGMT_NONE;
1004
1005
1006 if( strstr(spec, "TKIP") )
1007 c->pair_ciphers |= IWINFO_CIPHER_TKIP;
1008
1009 if( strstr(spec, "CCMP") )
1010 c->pair_ciphers |= IWINFO_CIPHER_CCMP;
1011
1012 if( strstr(spec, "WEP-40") )
1013 c->pair_ciphers |= IWINFO_CIPHER_WEP40;
1014
1015 if( strstr(spec, "WEP-104") )
1016 c->pair_ciphers |= IWINFO_CIPHER_WEP104;
1017
1018 c->group_ciphers = c->pair_ciphers;
1019 }
1020 }
1021
1022 int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
1023 {
1024 int freq, rssi, qmax, count;
1025 char *res;
1026 char cmd[256];
1027 char ssid[128] = { 0 };
1028 char bssid[18] = { 0 };
1029 char cipher[256] = { 0 };
1030
1031 struct iwinfo_scanlist_entry *e = (struct iwinfo_scanlist_entry *)buf;
1032
1033 /* WPA supplicant */
1034 if( (res = nl80211_wpasupp_info(ifname, "SCAN")) &&
1035 !strcmp(res, "OK\n") )
1036 {
1037 sleep(2);
1038
1039 if( (res = nl80211_wpasupp_info(ifname, "SCAN_RESULTS")) )
1040 {
1041 nl80211_get_quality_max(ifname, &qmax);
1042
1043 /* skip header line */
1044 while( *res++ != '\n' );
1045
1046 count = 0;
1047
1048 while( sscanf(res, "%17s %d %d %255s %127[^\n]\n",
1049 bssid, &freq, &rssi, cipher, ssid) > 0 )
1050 {
1051 /* BSSID */
1052 e->mac[0] = strtol(&bssid[0], NULL, 16);
1053 e->mac[1] = strtol(&bssid[3], NULL, 16);
1054 e->mac[2] = strtol(&bssid[6], NULL, 16);
1055 e->mac[3] = strtol(&bssid[9], NULL, 16);
1056 e->mac[4] = strtol(&bssid[12], NULL, 16);
1057 e->mac[5] = strtol(&bssid[15], NULL, 16);
1058
1059 /* SSID */
1060 memcpy(e->ssid, ssid,
1061 min(strlen(ssid), sizeof(e->ssid) - 1));
1062
1063 /* Mode (assume master) */
1064 sprintf((char *)e->mode, "Master");
1065
1066 /* Channel */
1067 e->channel = nl80211_freq2channel(freq);
1068
1069 /* Signal */
1070 e->signal = rssi;
1071
1072 /* Quality */
1073 if( rssi < 0 )
1074 {
1075 /* The cfg80211 wext compat layer assumes a signal range
1076 * of -110 dBm to -40 dBm, the quality value is derived
1077 * by adding 110 to the signal level */
1078 if( rssi < -110 )
1079 rssi = -110;
1080 else if( rssi > -40 )
1081 rssi = -40;
1082
1083 e->quality = (rssi + 110);
1084 }
1085 else
1086 {
1087 e->quality = rssi;
1088 }
1089
1090 /* Max. Quality */
1091 e->quality_max = qmax;
1092
1093 /* Crypto */
1094 nl80211_get_scancrypto(cipher, &e->crypto);
1095
1096 /* advance to next line */
1097 while( *res && *res++ != '\n' );
1098
1099 count++;
1100 e++;
1101 }
1102
1103 *len = count * sizeof(struct iwinfo_scanlist_entry);
1104 return 0;
1105 }
1106 }
1107
1108 /* AP scan */
1109 else
1110 {
1111 if( (res = nl80211_ifname2phy(ifname)) != NULL )
1112 {
1113 /*
1114 * This is a big ugly hack, just look away.
1115 */
1116
1117 sprintf(cmd, "ifconfig %s down 2>/dev/null", ifname);
1118 if( WEXITSTATUS(system(cmd)) )
1119 goto out;
1120
1121 sprintf(cmd, "iw phy %s interface add scan.%s "
1122 "type station 2>/dev/null", res, ifname);
1123 if( WEXITSTATUS(system(cmd)) )
1124 goto out;
1125
1126 sprintf(cmd, "ifconfig scan.%s up 2>/dev/null", ifname);
1127 if( WEXITSTATUS(system(cmd)) )
1128 goto out;
1129
1130 sprintf(cmd, "scan.%s", ifname);
1131 wext_get_scanlist(cmd, buf, len);
1132
1133 out:
1134 sprintf(cmd, "ifconfig scan.%s down 2>/dev/null", ifname);
1135 (void) WEXITSTATUS(system(cmd));
1136
1137 sprintf(cmd, "iw dev scan.%s del 2>/dev/null", ifname);
1138 (void) WEXITSTATUS(system(cmd));
1139
1140 sprintf(cmd, "ifconfig %s up 2>/dev/null", ifname);
1141 (void) WEXITSTATUS(system(cmd));
1142
1143 sprintf(cmd, "killall -HUP hostapd 2>/dev/null");
1144 (void) WEXITSTATUS(system(cmd));
1145
1146 return 0;
1147 }
1148 }
1149
1150 return -1;
1151 }
1152
1153 int nl80211_get_freqlist(const char *ifname, char *buf, int *len)
1154 {
1155 return wext_get_freqlist(ifname, buf, len);
1156 }
1157
1158 int nl80211_get_mbssid_support(const char *ifname, int *buf)
1159 {
1160 /* We assume that multi bssid is always possible */
1161 *buf = 1;
1162 return 0;
1163 }
1164
Lua Configuration Interface (mirror)