summaryrefslogtreecommitdiffstats
path: root/freebsd/sbin/ifconfig/ifconfig.c
blob: 0d658856aa29c7fff1d892ebfc80cb01ee8b2db8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)ifconfig.c	8.2 (Berkeley) 2/16/94";
#endif
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

#ifdef __rtems__
#define __need_getopt_newlib
#define option getopt_option
#include <getopt.h>
#undef option
#include <machine/rtems-bsd-program.h>
#include <machine/rtems-bsd-commands.h>
#endif /* __rtems__ */
#include <rtems/bsd/sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <rtems/bsd/sys/time.h>
#include <sys/module.h>
#include <sys/linker.h>

#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>

/* IP */
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <arpa/inet.h>
#include <netdb.h>

#include <ifaddrs.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <jail.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "ifconfig.h"

/*
 * Since "struct ifreq" is composed of various union members, callers
 * should pay special attention to interprete the value.
 * (.e.g. little/big endian difference in the structure.)
 */
struct	ifreq ifr;

char	name[IFNAMSIZ];
char	*descr = NULL;
size_t	descrlen = 64;
int	setaddr;
int	setmask;
int	doalias;
int	clearaddr;
int	newaddr = 1;
int	verbose;
int	noload;

int	supmedia = 0;
int	printkeys = 0;		/* Print keying material for interfaces. */

static	int ifconfig(int argc, char *const *argv, int iscreate,
		const struct afswtch *afp);
static	void status(const struct afswtch *afp, const struct sockaddr_dl *sdl,
		struct ifaddrs *ifa);
static	void tunnel_status(int s);
static	void usage(void);

static struct afswtch *af_getbyname(const char *name);
static struct afswtch *af_getbyfamily(int af);
static void af_other_status(int);

static struct option *opts = NULL;

void
opt_register(struct option *p)
{
	p->next = opts;
	opts = p;
}

static void
usage(void)
{
	char options[1024];
	struct option *p;

	/* XXX not right but close enough for now */
	options[0] = '\0';
	for (p = opts; p != NULL; p = p->next) {
		strlcat(options, p->opt_usage, sizeof(options));
		strlcat(options, " ", sizeof(options));
	}

	fprintf(stderr,
	"usage: ifconfig %sinterface address_family [address [dest_address]]\n"
	"                [parameters]\n"
	"       ifconfig interface create\n"
	"       ifconfig -a %s[-d] [-m] [-u] [-v] [address_family]\n"
	"       ifconfig -l [-d] [-u] [address_family]\n"
	"       ifconfig %s[-d] [-m] [-u] [-v]\n",
		options, options, options);
	exit(1);
}

#ifdef __rtems__
static void ifconfig_ctor(void);
static void ifconfig_dtor(void);
static int main(int argc, char *argv[]);

int rtems_bsd_command_ifconfig(int argc, char *argv[])
{
	int exit_code;

	rtems_bsd_program_lock();

	ifconfig_ctor();

	atalk_ctor();
	bridge_ctor();
	carp_ctor();
	clone_ctor();
	gif_ctor();
	gre_ctor();
	group_ctor();
	ifmedia_ctor();
	inet_ctor();
	inet6_ctor();
	lagg_ctor();
	link_ctor();
	mac_ctor();
	nd6_ctor();
	pfsync_ctor();
	vlan_ctor();

	exit_code = rtems_bsd_program_call_main("ifconfig", main, argc, argv);

	clone_dtor();
	ifconfig_dtor();

	rtems_bsd_program_unlock();

	return exit_code;
}
#endif /* __rtems__ */
int
main(int argc, char *argv[])
{
	int c, all, namesonly, downonly, uponly;
	const struct afswtch *afp = NULL;
	int ifindex;
	struct ifaddrs *ifap, *ifa;
	struct ifreq paifr;
	const struct sockaddr_dl *sdl;
	char options[1024], *cp;
	const char *ifname;
	struct option *p;
	size_t iflen;
#ifdef __rtems__
	struct getopt_data getopt_data;
	memset(&getopt_data, 0, sizeof(getopt_data));
#define optind getopt_data.optind
#define optarg getopt_data.optarg
#define opterr getopt_data.opterr
#define optopt getopt_data.optopt
#define getopt(argc, argv, opt) getopt_r(argc, argv, opt, &getopt_data)
#endif /* __rtems__ */

	all = downonly = uponly = namesonly = noload = verbose = 0;

	/* Parse leading line options */
	strlcpy(options, "adklmnuv", sizeof(options));
	for (p = opts; p != NULL; p = p->next)
		strlcat(options, p->opt, sizeof(options));
	while ((c = getopt(argc, argv, options)) != -1) {
		switch (c) {
		case 'a':	/* scan all interfaces */
			all++;
			break;
		case 'd':	/* restrict scan to "down" interfaces */
			downonly++;
			break;
		case 'k':
			printkeys++;
			break;
		case 'l':	/* scan interface names only */
			namesonly++;
			break;
		case 'm':	/* show media choices in status */
			supmedia = 1;
			break;
		case 'n':	/* suppress module loading */
			noload++;
			break;
		case 'u':	/* restrict scan to "up" interfaces */
			uponly++;
			break;
		case 'v':
			verbose++;
			break;
		default:
			for (p = opts; p != NULL; p = p->next)
				if (p->opt[0] == c) {
					p->cb(optarg);
					break;
				}
			if (p == NULL)
				usage();
			break;
		}
	}
	argc -= optind;
	argv += optind;

	/* -l cannot be used with -a or -m */
	if (namesonly && (all || supmedia))
		usage();

	/* nonsense.. */
	if (uponly && downonly)
		usage();

	/* no arguments is equivalent to '-a' */
	if (!namesonly && argc < 1)
		all = 1;

	/* -a and -l allow an address family arg to limit the output */
	if (all || namesonly) {
		if (argc > 1)
			usage();

		ifname = NULL;
		ifindex = 0;
		if (argc == 1) {
			afp = af_getbyname(*argv);
			if (afp == NULL)
				usage();
			if (afp->af_name != NULL)
				argc--, argv++;
			/* leave with afp non-zero */
		}
	} else {
		/* not listing, need an argument */
		if (argc < 1)
			usage();

		ifname = *argv;
		argc--, argv++;

		/* check and maybe load support for this interface */
		ifmaybeload(ifname);

		ifindex = if_nametoindex(ifname);
		if (ifindex == 0) {
			/*
			 * NOTE:  We must special-case the `create' command
			 * right here as we would otherwise fail when trying
			 * to find the interface.
			 */
			if (argc > 0 && (strcmp(argv[0], "create") == 0 ||
			    strcmp(argv[0], "plumb") == 0)) {
				iflen = strlcpy(name, ifname, sizeof(name));
				if (iflen >= sizeof(name))
					errx(1, "%s: cloning name too long",
					    ifname);
				ifconfig(argc, argv, 1, NULL);
				exit(0);
			}
			/*
			 * NOTE:  We have to special-case the `-vnet' command
			 * right here as we would otherwise fail when trying
			 * to find the interface as it lives in another vnet.
			 */
			if (argc > 0 && (strcmp(argv[0], "-vnet") == 0)) {
				iflen = strlcpy(name, ifname, sizeof(name));
				if (iflen >= sizeof(name))
					errx(1, "%s: interface name too long",
					    ifname);
				ifconfig(argc, argv, 0, NULL);
				exit(0);
			}
			errx(1, "interface %s does not exist", ifname);
		}
	}

	/* Check for address family */
	if (argc > 0) {
		afp = af_getbyname(*argv);
		if (afp != NULL)
			argc--, argv++;
	}

	if (getifaddrs(&ifap) != 0)
		err(EXIT_FAILURE, "getifaddrs");
	cp = NULL;
	ifindex = 0;
	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
		memset(&paifr, 0, sizeof(paifr));
		strncpy(paifr.ifr_name, ifa->ifa_name, sizeof(paifr.ifr_name));
		if (sizeof(paifr.ifr_addr) >= ifa->ifa_addr->sa_len) {
			memcpy(&paifr.ifr_addr, ifa->ifa_addr,
			    ifa->ifa_addr->sa_len);
		}

		if (ifname != NULL && strcmp(ifname, ifa->ifa_name) != 0)
			continue;
		if (ifa->ifa_addr->sa_family == AF_LINK)
			sdl = (const struct sockaddr_dl *) ifa->ifa_addr;
		else
			sdl = NULL;
		if (cp != NULL && strcmp(cp, ifa->ifa_name) == 0)
			continue;
		iflen = strlcpy(name, ifa->ifa_name, sizeof(name));
		if (iflen >= sizeof(name)) {
			warnx("%s: interface name too long, skipping",
			    ifa->ifa_name);
			continue;
		}
		cp = ifa->ifa_name;

		if ((ifa->ifa_flags & IFF_CANTCONFIG) != 0)
			continue;
		if (downonly && (ifa->ifa_flags & IFF_UP) != 0)
			continue;
		if (uponly && (ifa->ifa_flags & IFF_UP) == 0)
			continue;
		ifindex++;
		/*
		 * Are we just listing the interfaces?
		 */
		if (namesonly) {
			if (ifindex > 1)
				printf(" ");
			fputs(name, stdout);
			continue;
		}

		if (argc > 0)
			ifconfig(argc, argv, 0, afp);
		else
			status(afp, sdl, ifa);
	}
	if (namesonly)
		printf("\n");
	freeifaddrs(ifap);

	exit(0);
}

static struct afswtch *afs = NULL;

void
af_register(struct afswtch *p)
{
	p->af_next = afs;
	afs = p;
}

static struct afswtch *
af_getbyname(const char *name)
{
	struct afswtch *afp;

	for (afp = afs; afp !=  NULL; afp = afp->af_next)
		if (strcmp(afp->af_name, name) == 0)
			return afp;
	return NULL;
}

static struct afswtch *
af_getbyfamily(int af)
{
	struct afswtch *afp;

	for (afp = afs; afp != NULL; afp = afp->af_next)
		if (afp->af_af == af)
			return afp;
	return NULL;
}

static void
af_other_status(int s)
{
	struct afswtch *afp;
	uint8_t afmask[howmany(AF_MAX, NBBY)];

	memset(afmask, 0, sizeof(afmask));
	for (afp = afs; afp != NULL; afp = afp->af_next) {
		if (afp->af_other_status == NULL)
			continue;
		if (afp->af_af != AF_UNSPEC && isset(afmask, afp->af_af))
			continue;
		afp->af_other_status(s);
		setbit(afmask, afp->af_af);
	}
}

static void
af_all_tunnel_status(int s)
{
	struct afswtch *afp;
	uint8_t afmask[howmany(AF_MAX, NBBY)];

	memset(afmask, 0, sizeof(afmask));
	for (afp = afs; afp != NULL; afp = afp->af_next) {
		if (afp->af_status_tunnel == NULL)
			continue;
		if (afp->af_af != AF_UNSPEC && isset(afmask, afp->af_af))
			continue;
		afp->af_status_tunnel(s);
		setbit(afmask, afp->af_af);
	}
}

static struct cmd *cmds = NULL;

void
cmd_register(struct cmd *p)
{
	p->c_next = cmds;
	cmds = p;
}

static const struct cmd *
cmd_lookup(const char *name, int iscreate)
{
#define	N(a)	(sizeof(a)/sizeof(a[0]))
	const struct cmd *p;

	for (p = cmds; p != NULL; p = p->c_next)
		if (strcmp(name, p->c_name) == 0) {
			if (iscreate) {
				if (p->c_iscloneop)
					return p;
			} else {
				if (!p->c_iscloneop)
					return p;
			}
		}
	return NULL;
#undef N
}

struct callback {
	callback_func *cb_func;
	void	*cb_arg;
	struct callback *cb_next;
};
static struct callback *callbacks = NULL;

void
callback_register(callback_func *func, void *arg)
{
	struct callback *cb;

	cb = malloc(sizeof(struct callback));
	if (cb == NULL)
		errx(1, "unable to allocate memory for callback");
	cb->cb_func = func;
	cb->cb_arg = arg;
	cb->cb_next = callbacks;
	callbacks = cb;
}

/* specially-handled commands */
static void setifaddr(const char *, int, int, const struct afswtch *);
static const struct cmd setifaddr_cmd = DEF_CMD("ifaddr", 0, setifaddr);

static void setifdstaddr(const char *, int, int, const struct afswtch *);
static const struct cmd setifdstaddr_cmd =
	DEF_CMD("ifdstaddr", 0, setifdstaddr);

static int
ifconfig(int argc, char *const *argv, int iscreate, const struct afswtch *uafp)
{
	const struct afswtch *afp, *nafp;
	const struct cmd *p;
	struct callback *cb;
	int s;

	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
	afp = uafp != NULL ? uafp : af_getbyname("inet");
top:
	ifr.ifr_addr.sa_family =
		afp->af_af == AF_LINK || afp->af_af == AF_UNSPEC ?
		AF_LOCAL : afp->af_af;

	if ((s = socket(ifr.ifr_addr.sa_family, SOCK_DGRAM, 0)) < 0 &&
	    (uafp != NULL || errno != EPROTONOSUPPORT ||
	     (s = socket(AF_LOCAL, SOCK_DGRAM, 0)) < 0))
		err(1, "socket(family %u,SOCK_DGRAM", ifr.ifr_addr.sa_family);

	while (argc > 0) {
		p = cmd_lookup(*argv, iscreate);
		if (iscreate && p == NULL) {
			/*
			 * Push the clone create callback so the new
			 * device is created and can be used for any
			 * remaining arguments.
			 */
			cb = callbacks;
			if (cb == NULL)
				errx(1, "internal error, no callback");
			callbacks = cb->cb_next;
			cb->cb_func(s, cb->cb_arg);
			iscreate = 0;
			/*
			 * Handle any address family spec that
			 * immediately follows and potentially
			 * recreate the socket.
			 */
			nafp = af_getbyname(*argv);
			if (nafp != NULL) {
				argc--, argv++;
				if (nafp != afp) {
					close(s);
					afp = nafp;
					goto top;
				}
			}
			/*
			 * Look for a normal parameter.
			 */
			continue;
		}
		if (p == NULL) {
			/*
			 * Not a recognized command, choose between setting
			 * the interface address and the dst address.
			 */
			p = (setaddr ? &setifdstaddr_cmd : &setifaddr_cmd);
		}
		if (p->c_u.c_func || p->c_u.c_func2) {
			if (p->c_parameter == NEXTARG) {
				if (argv[1] == NULL)
					errx(1, "'%s' requires argument",
					    p->c_name);
				p->c_u.c_func(argv[1], 0, s, afp);
				argc--, argv++;
			} else if (p->c_parameter == OPTARG) {
				p->c_u.c_func(argv[1], 0, s, afp);
				if (argv[1] != NULL)
					argc--, argv++;
			} else if (p->c_parameter == NEXTARG2) {
				if (argc < 3)
					errx(1, "'%s' requires 2 arguments",
					    p->c_name);
				p->c_u.c_func2(argv[1], argv[2], s, afp);
				argc -= 2, argv += 2;
			} else
				p->c_u.c_func(*argv, p->c_parameter, s, afp);
		}
		argc--, argv++;
	}

	/*
	 * Do any post argument processing required by the address family.
	 */
	if (afp->af_postproc != NULL)
		afp->af_postproc(s, afp);
	/*
	 * Do deferred callbacks registered while processing
	 * command-line arguments.
	 */
	for (cb = callbacks; cb != NULL; cb = cb->cb_next)
		cb->cb_func(s, cb->cb_arg);
	/*
	 * Do deferred operations.
	 */
	if (clearaddr) {
		if (afp->af_ridreq == NULL || afp->af_difaddr == 0) {
			warnx("interface %s cannot change %s addresses!",
			      name, afp->af_name);
			clearaddr = 0;
		}
	}
	if (clearaddr) {
		int ret;
		strncpy(afp->af_ridreq, name, sizeof ifr.ifr_name);
		ret = ioctl(s, afp->af_difaddr, afp->af_ridreq);
		if (ret < 0) {
			if (errno == EADDRNOTAVAIL && (doalias >= 0)) {
				/* means no previous address for interface */
			} else
				Perror("ioctl (SIOCDIFADDR)");
		}
	}
	if (newaddr) {
		if (afp->af_addreq == NULL || afp->af_aifaddr == 0) {
			warnx("interface %s cannot change %s addresses!",
			      name, afp->af_name);
			newaddr = 0;
		}
	}
	if (newaddr && (setaddr || setmask)) {
		strncpy(afp->af_addreq, name, sizeof ifr.ifr_name);
		if (ioctl(s, afp->af_aifaddr, afp->af_addreq) < 0)
			Perror("ioctl (SIOCAIFADDR)");
	}

	close(s);
	return(0);
}

/*ARGSUSED*/
static void
setifaddr(const char *addr, int param, int s, const struct afswtch *afp)
{
	if (afp->af_getaddr == NULL)
		return;
	/*
	 * Delay the ioctl to set the interface addr until flags are all set.
	 * The address interpretation may depend on the flags,
	 * and the flags may change when the address is set.
	 */
	setaddr++;
	if (doalias == 0 && afp->af_af != AF_LINK)
		clearaddr = 1;
	afp->af_getaddr(addr, (doalias >= 0 ? ADDR : RIDADDR));
}

static void
settunnel(const char *src, const char *dst, int s, const struct afswtch *afp)
{
	struct addrinfo *srcres, *dstres;
	int ecode;

	if (afp->af_settunnel == NULL) {
		warn("address family %s does not support tunnel setup",
			afp->af_name);
		return;
	}

	if ((ecode = getaddrinfo(src, NULL, NULL, &srcres)) != 0)
		errx(1, "error in parsing address string: %s",
		    gai_strerror(ecode));

	if ((ecode = getaddrinfo(dst, NULL, NULL, &dstres)) != 0)  
		errx(1, "error in parsing address string: %s",
		    gai_strerror(ecode));

	if (srcres->ai_addr->sa_family != dstres->ai_addr->sa_family)
		errx(1,
		    "source and destination address families do not match");

	afp->af_settunnel(s, srcres, dstres);

	freeaddrinfo(srcres);
	freeaddrinfo(dstres);
}

/* ARGSUSED */
static void
deletetunnel(const char *vname, int param, int s, const struct afswtch *afp)
{

	if (ioctl(s, SIOCDIFPHYADDR, &ifr) < 0)
		err(1, "SIOCDIFPHYADDR");
}

#ifndef __rtems__
static void
setifvnet(const char *jname, int dummy __unused, int s,
    const struct afswtch *afp)
{
	struct ifreq my_ifr;

	memcpy(&my_ifr, &ifr, sizeof(my_ifr));
	my_ifr.ifr_jid = jail_getid(jname);
	if (my_ifr.ifr_jid < 0)
		errx(1, "%s", jail_errmsg);
	if (ioctl(s, SIOCSIFVNET, &my_ifr) < 0)
		err(1, "SIOCSIFVNET");
}

static void
setifrvnet(const char *jname, int dummy __unused, int s,
    const struct afswtch *afp)
{
	struct ifreq my_ifr;

	memcpy(&my_ifr, &ifr, sizeof(my_ifr));
	my_ifr.ifr_jid = jail_getid(jname);
	if (my_ifr.ifr_jid < 0)
		errx(1, "%s", jail_errmsg);
	if (ioctl(s, SIOCSIFRVNET, &my_ifr) < 0)
		err(1, "SIOCSIFRVNET(%d, %s)", my_ifr.ifr_jid, my_ifr.ifr_name);
}
#endif /* __rtems__ */

static void
setifnetmask(const char *addr, int dummy __unused, int s,
    const struct afswtch *afp)
{
	if (afp->af_getaddr != NULL) {
		setmask++;
		afp->af_getaddr(addr, MASK);
	}
}

static void
setifbroadaddr(const char *addr, int dummy __unused, int s,
    const struct afswtch *afp)
{
	if (afp->af_getaddr != NULL)
		afp->af_getaddr(addr, DSTADDR);
}

static void
setifipdst(const char *addr, int dummy __unused, int s,
    const struct afswtch *afp)
{
	const struct afswtch *inet;

	inet = af_getbyname("inet");
	if (inet == NULL)
		return;
	inet->af_getaddr(addr, DSTADDR);
	clearaddr = 0;
	newaddr = 0;
}

static void
notealias(const char *addr, int param, int s, const struct afswtch *afp)
{
#define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
	if (setaddr && doalias == 0 && param < 0)
		if (afp->af_addreq != NULL && afp->af_ridreq != NULL)
			bcopy((caddr_t)rqtosa(af_addreq),
			      (caddr_t)rqtosa(af_ridreq),
			      rqtosa(af_addreq)->sa_len);
	doalias = param;
	if (param < 0) {
		clearaddr = 1;
		newaddr = 0;
	} else
		clearaddr = 0;
#undef rqtosa
}

/*ARGSUSED*/
static void
setifdstaddr(const char *addr, int param __unused, int s, 
    const struct afswtch *afp)
{
	if (afp->af_getaddr != NULL)
		afp->af_getaddr(addr, DSTADDR);
}

/*
 * Note: doing an SIOCIGIFFLAGS scribbles on the union portion
 * of the ifreq structure, which may confuse other parts of ifconfig.
 * Make a private copy so we can avoid that.
 */
static void
setifflags(const char *vname, int value, int s, const struct afswtch *afp)
{
	struct ifreq		my_ifr;
	int flags;

	memset(&my_ifr, 0, sizeof(my_ifr));
	(void) strlcpy(my_ifr.ifr_name, name, sizeof(my_ifr.ifr_name));

 	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&my_ifr) < 0) {
 		Perror("ioctl (SIOCGIFFLAGS)");
 		exit(1);
 	}
	flags = (my_ifr.ifr_flags & 0xffff) | (my_ifr.ifr_flagshigh << 16);

	if (value < 0) {
		value = -value;
		flags &= ~value;
	} else
		flags |= value;
	my_ifr.ifr_flags = flags & 0xffff;
	my_ifr.ifr_flagshigh = flags >> 16;
	if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&my_ifr) < 0)
		Perror(vname);
}

void
setifcap(const char *vname, int value, int s, const struct afswtch *afp)
{
	int flags;

 	if (ioctl(s, SIOCGIFCAP, (caddr_t)&ifr) < 0) {
 		Perror("ioctl (SIOCGIFCAP)");
 		exit(1);
 	}
	flags = ifr.ifr_curcap;
	if (value < 0) {
		value = -value;
		flags &= ~value;
	} else
		flags |= value;
	flags &= ifr.ifr_reqcap;
	ifr.ifr_reqcap = flags;
	if (ioctl(s, SIOCSIFCAP, (caddr_t)&ifr) < 0)
		Perror(vname);
}

static void
setifmetric(const char *val, int dummy __unused, int s, 
    const struct afswtch *afp)
{
	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
	ifr.ifr_metric = atoi(val);
	if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
		warn("ioctl (set metric)");
}

static void
setifmtu(const char *val, int dummy __unused, int s, 
    const struct afswtch *afp)
{
	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
	ifr.ifr_mtu = atoi(val);
	if (ioctl(s, SIOCSIFMTU, (caddr_t)&ifr) < 0)
		warn("ioctl (set mtu)");
}

static void
setifname(const char *val, int dummy __unused, int s, 
    const struct afswtch *afp)
{
	char *newname;

	newname = strdup(val);
	if (newname == NULL) {
		warn("no memory to set ifname");
		return;
	}
	ifr.ifr_data = newname;
	if (ioctl(s, SIOCSIFNAME, (caddr_t)&ifr) < 0) {
		warn("ioctl (set name)");
		free(newname);
		return;
	}
	strlcpy(name, newname, sizeof(name));
	free(newname);
}

/* ARGSUSED */
static void
setifdescr(const char *val, int dummy __unused, int s, 
    const struct afswtch *afp)
{
	char *newdescr;

	ifr.ifr_buffer.length = strlen(val) + 1;
	if (ifr.ifr_buffer.length == 1) {
		ifr.ifr_buffer.buffer = newdescr = NULL;
		ifr.ifr_buffer.length = 0;
	} else {
		newdescr = strdup(val);
		ifr.ifr_buffer.buffer = newdescr;
		if (newdescr == NULL) {
			warn("no memory to set ifdescr");
			return;
		}
	}

	if (ioctl(s, SIOCSIFDESCR, (caddr_t)&ifr) < 0)
		warn("ioctl (set descr)");

	free(newdescr);
}

/* ARGSUSED */
static void
unsetifdescr(const char *val, int value, int s, const struct afswtch *afp)
{

	setifdescr("", 0, s, 0);
}

#define	IFFBITS \
"\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6SMART\7RUNNING" \
"\10NOARP\11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX\15LINK0\16LINK1\17LINK2" \
"\20MULTICAST\22PPROMISC\23MONITOR\24STATICARP"

#define	IFCAPBITS \
"\020\1RXCSUM\2TXCSUM\3NETCONS\4VLAN_MTU\5VLAN_HWTAGGING\6JUMBO_MTU\7POLLING" \
"\10VLAN_HWCSUM\11TSO4\12TSO6\13LRO\14WOL_UCAST\15WOL_MCAST\16WOL_MAGIC" \
"\21VLAN_HWFILTER\23VLAN_HWTSO\24LINKSTATE\25NETMAP"

/*
 * Print the status of the interface.  If an address family was
 * specified, show only it; otherwise, show them all.
 */
static void
status(const struct afswtch *afp, const struct sockaddr_dl *sdl,
	struct ifaddrs *ifa)
{
	struct ifaddrs *ift;
	int allfamilies, s;
	struct ifstat ifs;

	if (afp == NULL) {
		allfamilies = 1;
		ifr.ifr_addr.sa_family = AF_LOCAL;
	} else {
		allfamilies = 0;
		ifr.ifr_addr.sa_family =
		    afp->af_af == AF_LINK ? AF_LOCAL : afp->af_af;
	}
	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));

	s = socket(ifr.ifr_addr.sa_family, SOCK_DGRAM, 0);
	if (s < 0)
		err(1, "socket(family %u,SOCK_DGRAM)", ifr.ifr_addr.sa_family);

	printf("%s: ", name);
	printb("flags", ifa->ifa_flags, IFFBITS);
	if (ioctl(s, SIOCGIFMETRIC, &ifr) != -1)
		printf(" metric %d", ifr.ifr_metric);
	if (ioctl(s, SIOCGIFMTU, &ifr) != -1)
		printf(" mtu %d", ifr.ifr_mtu);
	putchar('\n');

	for (;;) {
		if ((descr = reallocf(descr, descrlen)) != NULL) {
			ifr.ifr_buffer.buffer = descr;
			ifr.ifr_buffer.length = descrlen;
			if (ioctl(s, SIOCGIFDESCR, &ifr) == 0) {
				if (ifr.ifr_buffer.buffer == descr) {
					if (strlen(descr) > 0)
						printf("\tdescription: %s\n",
						    descr);
				} else if (ifr.ifr_buffer.length > descrlen) {
					descrlen = ifr.ifr_buffer.length;
					continue;
				}
			}
		} else
			warn("unable to allocate memory for interface"
			    "description");
		break;
	}

	if (ioctl(s, SIOCGIFCAP, (caddr_t)&ifr) == 0) {
		if (ifr.ifr_curcap != 0) {
			printb("\toptions", ifr.ifr_curcap, IFCAPBITS);
			putchar('\n');
		}
		if (supmedia && ifr.ifr_reqcap != 0) {
			printb("\tcapabilities", ifr.ifr_reqcap, IFCAPBITS);
			putchar('\n');
		}
	}

	tunnel_status(s);

	for (ift = ifa; ift != NULL; ift = ift->ifa_next) {
		if (ift->ifa_addr == NULL)
			continue;
		if (strcmp(ifa->ifa_name, ift->ifa_name) != 0)
			continue;
		if (allfamilies) {
			const struct afswtch *p;
			p = af_getbyfamily(ift->ifa_addr->sa_family);
			if (p != NULL && p->af_status != NULL)
				p->af_status(s, ift);
		} else if (afp->af_af == ift->ifa_addr->sa_family)
			afp->af_status(s, ift);
	}
#if 0
	if (allfamilies || afp->af_af == AF_LINK) {
		const struct afswtch *lafp;

		/*
		 * Hack; the link level address is received separately
		 * from the routing information so any address is not
		 * handled above.  Cobble together an entry and invoke
		 * the status method specially.
		 */
		lafp = af_getbyname("lladdr");
		if (lafp != NULL) {
			info.rti_info[RTAX_IFA] = (struct sockaddr *)sdl;
			lafp->af_status(s, &info);
		}
	}
#endif
	if (allfamilies)
		af_other_status(s);
	else if (afp->af_other_status != NULL)
		afp->af_other_status(s);

	strncpy(ifs.ifs_name, name, sizeof ifs.ifs_name);
	if (ioctl(s, SIOCGIFSTATUS, &ifs) == 0) 
		printf("%s", ifs.ascii);

	close(s);
	return;
}

static void
tunnel_status(int s)
{
	af_all_tunnel_status(s);
}

void
Perror(const char *cmd)
{
	switch (errno) {

	case ENXIO:
		errx(1, "%s: no such interface", cmd);
		break;

	case EPERM:
		errx(1, "%s: permission denied", cmd);
		break;

	default:
		err(1, "%s", cmd);
	}
}

/*
 * Print a value a la the %b format of the kernel's printf
 */
void
printb(const char *s, unsigned v, const char *bits)
{
	int i, any = 0;
	char c;

	if (bits && *bits == 8)
		printf("%s=%o", s, v);
	else
		printf("%s=%x", s, v);
	bits++;
	if (bits) {
		putchar('<');
		while ((i = *bits++) != '\0') {
			if (v & (1 << (i-1))) {
				if (any)
					putchar(',');
				any = 1;
				for (; (c = *bits) > 32; bits++)
					putchar(c);
			} else
				for (; *bits > 32; bits++)
					;
		}
		putchar('>');
	}
}

void
ifmaybeload(const char *name)
{
#ifndef __rtems__
#define MOD_PREFIX_LEN		3	/* "if_" */
	struct module_stat mstat;
	int fileid, modid;
	char ifkind[IFNAMSIZ + MOD_PREFIX_LEN], ifname[IFNAMSIZ], *dp;
	const char *cp;

	/* loading suppressed by the user */
	if (noload)
		return;

	/* trim the interface number off the end */
	strlcpy(ifname, name, sizeof(ifname));
	for (dp = ifname; *dp != 0; dp++)
		if (isdigit(*dp)) {
			*dp = 0;
			break;
		}

	/* turn interface and unit into module name */
	strcpy(ifkind, "if_");
	strlcpy(ifkind + MOD_PREFIX_LEN, ifname,
	    sizeof(ifkind) - MOD_PREFIX_LEN);

	/* scan files in kernel */
	mstat.version = sizeof(struct module_stat);
	for (fileid = kldnext(0); fileid > 0; fileid = kldnext(fileid)) {
		/* scan modules in file */
		for (modid = kldfirstmod(fileid); modid > 0;
		     modid = modfnext(modid)) {
			if (modstat(modid, &mstat) < 0)
				continue;
			/* strip bus name if present */
			if ((cp = strchr(mstat.name, '/')) != NULL) {
				cp++;
			} else {
				cp = mstat.name;
			}
			/* already loaded? */
			if (strncmp(ifname, cp, strlen(ifname) + 1) == 0 ||
			    strncmp(ifkind, cp, strlen(ifkind) + 1) == 0)
				return;
		}
	}

	/* not present, we should try to load it */
	kldload(ifkind);
#endif
}

static struct cmd basic_cmds[] = {
	DEF_CMD("up",		IFF_UP,		setifflags),
	DEF_CMD("down",		-IFF_UP,	setifflags),
	DEF_CMD("arp",		-IFF_NOARP,	setifflags),
	DEF_CMD("-arp",		IFF_NOARP,	setifflags),
	DEF_CMD("debug",	IFF_DEBUG,	setifflags),
	DEF_CMD("-debug",	-IFF_DEBUG,	setifflags),
	DEF_CMD_ARG("description",		setifdescr),
	DEF_CMD_ARG("descr",			setifdescr),
	DEF_CMD("-description",	0,		unsetifdescr),
	DEF_CMD("-descr",	0,		unsetifdescr),
	DEF_CMD("promisc",	IFF_PPROMISC,	setifflags),
	DEF_CMD("-promisc",	-IFF_PPROMISC,	setifflags),
	DEF_CMD("add",		IFF_UP,		notealias),
	DEF_CMD("alias",	IFF_UP,		notealias),
	DEF_CMD("-alias",	-IFF_UP,	notealias),
	DEF_CMD("delete",	-IFF_UP,	notealias),
	DEF_CMD("remove",	-IFF_UP,	notealias),
#ifdef notdef
#define	EN_SWABIPS	0x1000
	DEF_CMD("swabips",	EN_SWABIPS,	setifflags),
	DEF_CMD("-swabips",	-EN_SWABIPS,	setifflags),
#endif
	DEF_CMD_ARG("netmask",			setifnetmask),
	DEF_CMD_ARG("metric",			setifmetric),
	DEF_CMD_ARG("broadcast",		setifbroadaddr),
	DEF_CMD_ARG("ipdst",			setifipdst),
	DEF_CMD_ARG2("tunnel",			settunnel),
	DEF_CMD("-tunnel", 0,			deletetunnel),
	DEF_CMD("deletetunnel", 0,		deletetunnel),
#ifndef __rtems__
	DEF_CMD_ARG("vnet",			setifvnet),
	DEF_CMD_ARG("-vnet",			setifrvnet),
#endif /* __rtems__ */
	DEF_CMD("link0",	IFF_LINK0,	setifflags),
	DEF_CMD("-link0",	-IFF_LINK0,	setifflags),
	DEF_CMD("link1",	IFF_LINK1,	setifflags),
	DEF_CMD("-link1",	-IFF_LINK1,	setifflags),
	DEF_CMD("link2",	IFF_LINK2,	setifflags),
	DEF_CMD("-link2",	-IFF_LINK2,	setifflags),
	DEF_CMD("monitor",	IFF_MONITOR,	setifflags),
	DEF_CMD("-monitor",	-IFF_MONITOR,	setifflags),
	DEF_CMD("staticarp",	IFF_STATICARP,	setifflags),
	DEF_CMD("-staticarp",	-IFF_STATICARP,	setifflags),
	DEF_CMD("rxcsum",	IFCAP_RXCSUM,	setifcap),
	DEF_CMD("-rxcsum",	-IFCAP_RXCSUM,	setifcap),
	DEF_CMD("txcsum",	IFCAP_TXCSUM,	setifcap),
	DEF_CMD("-txcsum",	-IFCAP_TXCSUM,	setifcap),
	DEF_CMD("netcons",	IFCAP_NETCONS,	setifcap),
	DEF_CMD("-netcons",	-IFCAP_NETCONS,	setifcap),
	DEF_CMD("polling",	IFCAP_POLLING,	setifcap),
	DEF_CMD("-polling",	-IFCAP_POLLING,	setifcap),
	DEF_CMD("tso",		IFCAP_TSO,	setifcap),
	DEF_CMD("-tso",		-IFCAP_TSO,	setifcap),
	DEF_CMD("lro",		IFCAP_LRO,	setifcap),
	DEF_CMD("-lro",		-IFCAP_LRO,	setifcap),
	DEF_CMD("wol",		IFCAP_WOL,	setifcap),
	DEF_CMD("-wol",		-IFCAP_WOL,	setifcap),
	DEF_CMD("wol_ucast",	IFCAP_WOL_UCAST,	setifcap),
	DEF_CMD("-wol_ucast",	-IFCAP_WOL_UCAST,	setifcap),
	DEF_CMD("wol_mcast",	IFCAP_WOL_MCAST,	setifcap),
	DEF_CMD("-wol_mcast",	-IFCAP_WOL_MCAST,	setifcap),
	DEF_CMD("wol_magic",	IFCAP_WOL_MAGIC,	setifcap),
	DEF_CMD("-wol_magic",	-IFCAP_WOL_MAGIC,	setifcap),
	DEF_CMD("normal",	-IFF_LINK0,	setifflags),
	DEF_CMD("compress",	IFF_LINK0,	setifflags),
	DEF_CMD("noicmp",	IFF_LINK1,	setifflags),
	DEF_CMD_ARG("mtu",			setifmtu),
	DEF_CMD_ARG("name",			setifname),
};

static __constructor void
ifconfig_ctor(void)
{
#ifdef __rtems__
	memset(&ifr, 0, sizeof(ifr));
	memset(&name, 0, sizeof(name));
	descr = NULL;
	descrlen = 64;
	setaddr = 0;
	setmask = 0;
	doalias = 0;
	clearaddr = 0;
	newaddr = 1;
	verbose = 0;
	noload = 0;
	supmedia = 0;
	printkeys = 0;
	opts = NULL;
	afs = NULL;
	callbacks = NULL;
	cmds = NULL;
#endif /* __rtems__ */
#define	N(a)	(sizeof(a) / sizeof(a[0]))
	size_t i;

	for (i = 0; i < N(basic_cmds);  i++)
		cmd_register(&basic_cmds[i]);
#undef N
}
#ifdef __rtems__
static void
ifconfig_dtor(void)
{
	struct callback *cb = callbacks;

	while (cb != NULL) {
		struct callback *to_free = cb;

		cb = to_free->cb_next;
		free(to_free);
	}

	free(descr);
}
#endif /* __rtems__ */