xref: /original-bsd/sbin/ifconfig/ifconfig.c (revision f737e041) 
1 /*
2  * Copyright (c) 1983, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * %sccs.include.redist.c%
6  */
7 
8 #ifndef lint
9 static char copyright[] =
10 "@(#) Copyright (c) 1983, 1993\n\
11 	The Regents of the University of California.  All rights reserved.\n";
12 #endif /* not lint */
13 
14 #ifndef lint
15 static char sccsid[] = "@(#)ifconfig.c	8.2 (Berkeley) 02/16/94";
16 #endif /* not lint */
17 
18 #include <sys/param.h>
19 #include <sys/socket.h>
20 #include <sys/ioctl.h>
21 
22 #include <net/if.h>
23 #include <netinet/in.h>
24 #include <arpa/inet.h>
25 
26 #define	NSIP
27 #include <netns/ns.h>
28 #include <netns/ns_if.h>
29 #include <netdb.h>
30 
31 #define EON
32 #include <netiso/iso.h>
33 #include <netiso/iso_var.h>
34 #include <sys/protosw.h>
35 
36 #include <ctype.h>
37 #include <err.h>
38 #include <errno.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <unistd.h>
43 
44 struct	ifreq		ifr, ridreq;
45 struct	ifaliasreq	addreq;
46 struct	iso_ifreq	iso_ridreq;
47 struct	iso_aliasreq	iso_addreq;
48 struct	sockaddr_in	netmask;
49 
50 char	name[30];
51 int	flags;
52 int	metric;
53 int	nsellength = 1;
54 int	setaddr;
55 int	setipdst;
56 int	doalias;
57 int	clearaddr;
58 int	newaddr = 1;
59 int	s;
60 extern	int errno;
61 
62 int	setifflags(), setifaddr(), setifdstaddr(), setifnetmask();
63 int	setifmetric(), setifbroadaddr(), setifipdst();
64 int	notealias(), setsnpaoffset(), setnsellength(), notrailers();
65 
66 #define	NEXTARG		0xffffff
67 
68 struct	cmd {
69 	char	*c_name;
70 	int	c_parameter;		/* NEXTARG means next argv */
71 	int	(*c_func)();
72 } cmds[] = {
73 	{ "up",		IFF_UP,		setifflags } ,
74 	{ "down",	-IFF_UP,	setifflags },
75 	{ "trailers",	-1,		notrailers },
76 	{ "-trailers",	1,		notrailers },
77 	{ "arp",	-IFF_NOARP,	setifflags },
78 	{ "-arp",	IFF_NOARP,	setifflags },
79 	{ "debug",	IFF_DEBUG,	setifflags },
80 	{ "-debug",	-IFF_DEBUG,	setifflags },
81 	{ "alias",	IFF_UP,		notealias },
82 	{ "-alias",	-IFF_UP,	notealias },
83 	{ "delete",	-IFF_UP,	notealias },
84 #ifdef notdef
85 #define	EN_SWABIPS	0x1000
86 	{ "swabips",	EN_SWABIPS,	setifflags },
87 	{ "-swabips",	-EN_SWABIPS,	setifflags },
88 #endif
89 	{ "netmask",	NEXTARG,	setifnetmask },
90 	{ "metric",	NEXTARG,	setifmetric },
91 	{ "broadcast",	NEXTARG,	setifbroadaddr },
92 	{ "ipdst",	NEXTARG,	setifipdst },
93 	{ "snpaoffset",	NEXTARG,	setsnpaoffset },
94 	{ "nsellength",	NEXTARG,	setnsellength },
95 	{ "link0",	IFF_LINK0,	setifflags } ,
96 	{ "-link0",	-IFF_LINK0,	setifflags } ,
97 	{ "link1",	IFF_LINK1,	setifflags } ,
98 	{ "-link1",	-IFF_LINK1,	setifflags } ,
99 	{ "link2",	IFF_LINK2,	setifflags } ,
100 	{ "-link2",	-IFF_LINK2,	setifflags } ,
101 	{ 0,		0,		setifaddr },
102 	{ 0,		0,		setifdstaddr },
103 };
104 
105 /*
106  * XNS support liberally adapted from code written at the University of
107  * Maryland principally by James O'Toole and Chris Torek.
108  */
109 int	in_status(), in_getaddr();
110 int	xns_status(), xns_getaddr();
111 int	iso_status(), iso_getaddr();
112 
113 /* Known address families */
114 struct afswtch {
115 	char *af_name;
116 	short af_af;
117 	int (*af_status)();
118 	int (*af_getaddr)();
119 	int af_difaddr;
120 	int af_aifaddr;
121 	caddr_t af_ridreq;
122 	caddr_t af_addreq;
123 } afs[] = {
124 #define C(x) ((caddr_t) &x)
125 	{ "inet", AF_INET, in_status, in_getaddr,
126 	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
127 	{ "ns", AF_NS, xns_status, xns_getaddr,
128 	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
129 	{ "iso", AF_ISO, iso_status, iso_getaddr,
130 	     SIOCDIFADDR_ISO, SIOCAIFADDR_ISO, C(iso_ridreq), C(iso_addreq) },
131 	{ 0,	0,	    0,		0 }
132 };
133 
134 struct afswtch *afp;	/*the address family being set or asked about*/
135 
136 main(argc, argv)
137 	int argc;
138 	char *argv[];
139 {
140 	int af = AF_INET;
141 	register struct afswtch *rafp;
142 
143 	if (argc < 2) {
144 		fprintf(stderr, "usage: ifconfig interface\n%s%s%s%s%s",
145 		    "\t[ af [ address [ dest_addr ] ] [ up ] [ down ]",
146 			    "[ netmask mask ] ]\n",
147 		    "\t[ metric n ]\n",
148 		    "\t[ arp | -arp ]\n",
149 		    "\t[ link0 | -link0 ] [ link1 | -link1 ] [ link2 | -link2 ] \n");
150 		exit(1);
151 	}
152 	argc--, argv++;
153 	strncpy(name, *argv, sizeof(name));
154 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
155 	argc--, argv++;
156 	if (argc > 0) {
157 		for (afp = rafp = afs; rafp->af_name; rafp++)
158 			if (strcmp(rafp->af_name, *argv) == 0) {
159 				afp = rafp; argc--; argv++;
160 				break;
161 			}
162 		rafp = afp;
163 		af = ifr.ifr_addr.sa_family = rafp->af_af;
164 	}
165 	s = socket(af, SOCK_DGRAM, 0);
166 	if (s < 0) {
167 		perror("ifconfig: socket");
168 		exit(1);
169 	}
170 	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
171 		Perror("ioctl (SIOCGIFFLAGS)");
172 		exit(1);
173 	}
174 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
175 	flags = ifr.ifr_flags;
176 	if (ioctl(s, SIOCGIFMETRIC, (caddr_t)&ifr) < 0)
177 		perror("ioctl (SIOCGIFMETRIC)");
178 	else
179 		metric = ifr.ifr_metric;
180 	if (argc == 0) {
181 		status();
182 		exit(0);
183 	}
184 	while (argc > 0) {
185 		register struct cmd *p;
186 
187 		for (p = cmds; p->c_name; p++)
188 			if (strcmp(*argv, p->c_name) == 0)
189 				break;
190 		if (p->c_name == 0 && setaddr)
191 			p++;	/* got src, do dst */
192 		if (p->c_func) {
193 			if (p->c_parameter == NEXTARG) {
194 				if (argv[1] == NULL)
195 					errx(1, "'%s' requires argument",
196 					    p->c_name);
197 				(*p->c_func)(argv[1]);
198 				argc--, argv++;
199 			} else
200 				(*p->c_func)(*argv, p->c_parameter);
201 		}
202 		argc--, argv++;
203 	}
204 	if (af == AF_ISO)
205 		adjust_nsellength();
206 	if (setipdst && af==AF_NS) {
207 		struct nsip_req rq;
208 		int size = sizeof(rq);
209 
210 		rq.rq_ns = addreq.ifra_addr;
211 		rq.rq_ip = addreq.ifra_dstaddr;
212 
213 		if (setsockopt(s, 0, SO_NSIP_ROUTE, &rq, size) < 0)
214 			Perror("Encapsulation Routing");
215 	}
216 	if (clearaddr) {
217 		int ret;
218 		strncpy(rafp->af_ridreq, name, sizeof ifr.ifr_name);
219 		if ((ret = ioctl(s, rafp->af_difaddr, rafp->af_ridreq)) < 0) {
220 			if (errno == EADDRNOTAVAIL && (doalias >= 0)) {
221 				/* means no previous address for interface */
222 			} else
223 				Perror("ioctl (SIOCDIFADDR)");
224 		}
225 	}
226 	if (newaddr) {
227 		strncpy(rafp->af_addreq, name, sizeof ifr.ifr_name);
228 		if (ioctl(s, rafp->af_aifaddr, rafp->af_addreq) < 0)
229 			Perror("ioctl (SIOCAIFADDR)");
230 	}
231 	exit(0);
232 }
233 #define RIDADDR 0
234 #define ADDR	1
235 #define MASK	2
236 #define DSTADDR	3
237 
238 /*ARGSUSED*/
239 setifaddr(addr, param)
240 	char *addr;
241 	short param;
242 {
243 	/*
244 	 * Delay the ioctl to set the interface addr until flags are all set.
245 	 * The address interpretation may depend on the flags,
246 	 * and the flags may change when the address is set.
247 	 */
248 	setaddr++;
249 	if (doalias == 0)
250 		clearaddr = 1;
251 	(*afp->af_getaddr)(addr, (doalias >= 0 ? ADDR : RIDADDR));
252 }
253 
254 setifnetmask(addr)
255 	char *addr;
256 {
257 	(*afp->af_getaddr)(addr, MASK);
258 }
259 
260 setifbroadaddr(addr)
261 	char *addr;
262 {
263 	(*afp->af_getaddr)(addr, DSTADDR);
264 }
265 
266 setifipdst(addr)
267 	char *addr;
268 {
269 	in_getaddr(addr, DSTADDR);
270 	setipdst++;
271 	clearaddr = 0;
272 	newaddr = 0;
273 }
274 #define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
275 /*ARGSUSED*/
276 notealias(addr, param)
277 	char *addr;
278 {
279 	if (setaddr && doalias == 0 && param < 0)
280 		bcopy((caddr_t)rqtosa(af_addreq),
281 		      (caddr_t)rqtosa(af_ridreq),
282 		      rqtosa(af_addreq)->sa_len);
283 	doalias = param;
284 	if (param < 0) {
285 		clearaddr = 1;
286 		newaddr = 0;
287 	} else
288 		clearaddr = 0;
289 }
290 
291 /*ARGSUSED*/
292 notrailers(vname, value)
293 	char *vname;
294 	int value;
295 {
296 	printf("Note: trailers are no longer sent, but always received\n");
297 }
298 
299 /*ARGSUSED*/
300 setifdstaddr(addr, param)
301 	char *addr;
302 	int param;
303 {
304 	(*afp->af_getaddr)(addr, DSTADDR);
305 }
306 
307 setifflags(vname, value)
308 	char *vname;
309 	short value;
310 {
311  	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
312  		Perror("ioctl (SIOCGIFFLAGS)");
313  		exit(1);
314  	}
315 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
316  	flags = ifr.ifr_flags;
317 
318 	if (value < 0) {
319 		value = -value;
320 		flags &= ~value;
321 	} else
322 		flags |= value;
323 	ifr.ifr_flags = flags;
324 	if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
325 		Perror(vname);
326 }
327 
328 setifmetric(val)
329 	char *val;
330 {
331 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
332 	ifr.ifr_metric = atoi(val);
333 	if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
334 		perror("ioctl (set metric)");
335 }
336 
337 setsnpaoffset(val)
338 	char *val;
339 {
340 	iso_addreq.ifra_snpaoffset = atoi(val);
341 }
342 
343 #define	IFFBITS \
344 "\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6NOTRAILERS\7RUNNING\10NOARP\
345 \11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX\15LINK0\16LINK1\17LINK2\20MULTICAST"
346 
347 /*
348  * Print the status of the interface.  If an address family was
349  * specified, show it and it only; otherwise, show them all.
350  */
351 status()
352 {
353 	register struct afswtch *p = afp;
354 	short af = ifr.ifr_addr.sa_family;
355 
356 	printf("%s: ", name);
357 	printb("flags", flags, IFFBITS);
358 	if (metric)
359 		printf(" metric %d", metric);
360 	putchar('\n');
361 	if ((p = afp) != NULL) {
362 		(*p->af_status)(1);
363 	} else for (p = afs; p->af_name; p++) {
364 		ifr.ifr_addr.sa_family = p->af_af;
365 		(*p->af_status)(0);
366 	}
367 }
368 
369 in_status(force)
370 	int force;
371 {
372 	struct sockaddr_in *sin;
373 	char *inet_ntoa();
374 
375 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
376 	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
377 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
378 			if (!force)
379 				return;
380 			bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
381 		} else
382 			perror("ioctl (SIOCGIFADDR)");
383 	}
384 	sin = (struct sockaddr_in *)&ifr.ifr_addr;
385 	printf("\tinet %s ", inet_ntoa(sin->sin_addr));
386 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
387 	if (ioctl(s, SIOCGIFNETMASK, (caddr_t)&ifr) < 0) {
388 		if (errno != EADDRNOTAVAIL)
389 			perror("ioctl (SIOCGIFNETMASK)");
390 		bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
391 	} else
392 		netmask.sin_addr =
393 		    ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
394 	if (flags & IFF_POINTOPOINT) {
395 		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
396 			if (errno == EADDRNOTAVAIL)
397 			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
398 			else
399 			    perror("ioctl (SIOCGIFDSTADDR)");
400 		}
401 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
402 		sin = (struct sockaddr_in *)&ifr.ifr_dstaddr;
403 		printf("--> %s ", inet_ntoa(sin->sin_addr));
404 	}
405 	printf("netmask 0x%x ", ntohl(netmask.sin_addr.s_addr));
406 	if (flags & IFF_BROADCAST) {
407 		if (ioctl(s, SIOCGIFBRDADDR, (caddr_t)&ifr) < 0) {
408 			if (errno == EADDRNOTAVAIL)
409 			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
410 			else
411 			    perror("ioctl (SIOCGIFADDR)");
412 		}
413 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
414 		sin = (struct sockaddr_in *)&ifr.ifr_addr;
415 		if (sin->sin_addr.s_addr != 0)
416 			printf("broadcast %s", inet_ntoa(sin->sin_addr));
417 	}
418 	putchar('\n');
419 }
420 
421 
422 xns_status(force)
423 	int force;
424 {
425 	struct sockaddr_ns *sns;
426 
427 	close(s);
428 	s = socket(AF_NS, SOCK_DGRAM, 0);
429 	if (s < 0) {
430 		if (errno == EPROTONOSUPPORT)
431 			return;
432 		perror("ifconfig: socket");
433 		exit(1);
434 	}
435 	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
436 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
437 			if (!force)
438 				return;
439 			bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
440 		} else
441 			perror("ioctl (SIOCGIFADDR)");
442 	}
443 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
444 	sns = (struct sockaddr_ns *)&ifr.ifr_addr;
445 	printf("\tns %s ", ns_ntoa(sns->sns_addr));
446 	if (flags & IFF_POINTOPOINT) { /* by W. Nesheim@Cornell */
447 		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
448 			if (errno == EADDRNOTAVAIL)
449 			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
450 			else
451 			    Perror("ioctl (SIOCGIFDSTADDR)");
452 		}
453 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
454 		sns = (struct sockaddr_ns *)&ifr.ifr_dstaddr;
455 		printf("--> %s ", ns_ntoa(sns->sns_addr));
456 	}
457 	putchar('\n');
458 }
459 
460 iso_status(force)
461 	int force;
462 {
463 	struct sockaddr_iso *siso;
464 	struct iso_ifreq ifr;
465 
466 	close(s);
467 	s = socket(AF_ISO, SOCK_DGRAM, 0);
468 	if (s < 0) {
469 		if (errno == EPROTONOSUPPORT)
470 			return;
471 		perror("ifconfig: socket");
472 		exit(1);
473 	}
474 	bzero((caddr_t)&ifr, sizeof(ifr));
475 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
476 	if (ioctl(s, SIOCGIFADDR_ISO, (caddr_t)&ifr) < 0) {
477 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
478 			if (!force)
479 				return;
480 			bzero((char *)&ifr.ifr_Addr, sizeof(ifr.ifr_Addr));
481 		} else {
482 			perror("ioctl (SIOCGIFADDR_ISO)");
483 			exit(1);
484 		}
485 	}
486 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
487 	siso = &ifr.ifr_Addr;
488 	printf("\tiso %s ", iso_ntoa(&siso->siso_addr));
489 	if (ioctl(s, SIOCGIFNETMASK_ISO, (caddr_t)&ifr) < 0) {
490 		if (errno != EADDRNOTAVAIL)
491 			perror("ioctl (SIOCGIFNETMASK_ISO)");
492 	} else {
493 		printf(" netmask %s ", iso_ntoa(&siso->siso_addr));
494 	}
495 	if (flags & IFF_POINTOPOINT) {
496 		if (ioctl(s, SIOCGIFDSTADDR_ISO, (caddr_t)&ifr) < 0) {
497 			if (errno == EADDRNOTAVAIL)
498 			    bzero((char *)&ifr.ifr_Addr, sizeof(ifr.ifr_Addr));
499 			else
500 			    Perror("ioctl (SIOCGIFDSTADDR_ISO)");
501 		}
502 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
503 		siso = &ifr.ifr_Addr;
504 		printf("--> %s ", iso_ntoa(&siso->siso_addr));
505 	}
506 	putchar('\n');
507 }
508 
509 Perror(cmd)
510 	char *cmd;
511 {
512 	extern int errno;
513 
514 	switch (errno) {
515 
516 	case ENXIO:
517 		errx(1, "%s: no such interface", cmd);
518 		break;
519 
520 	case EPERM:
521 		errx(1, "%s: permission denied", cmd);
522 		break;
523 
524 	default:
525 		err(1, "%s", cmd);
526 	}
527 }
528 
529 struct	in_addr inet_makeaddr();
530 
531 #define SIN(x) ((struct sockaddr_in *) &(x))
532 struct sockaddr_in *sintab[] = {
533 SIN(ridreq.ifr_addr), SIN(addreq.ifra_addr),
534 SIN(addreq.ifra_mask), SIN(addreq.ifra_broadaddr)};
535 
536 in_getaddr(s, which)
537 	char *s;
538 {
539 	register struct sockaddr_in *sin = sintab[which];
540 	struct hostent *hp;
541 	struct netent *np;
542 	int val;
543 
544 	sin->sin_len = sizeof(*sin);
545 	if (which != MASK)
546 		sin->sin_family = AF_INET;
547 
548 	if ((val = inet_addr(s)) != -1)
549 		sin->sin_addr.s_addr = val;
550 	else if (hp = gethostbyname(s))
551 		bcopy(hp->h_addr, (char *)&sin->sin_addr, hp->h_length);
552 	else if (np = getnetbyname(s))
553 		sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
554 	else
555 		errx(1, "%s: bad value", s);
556 }
557 
558 /*
559  * Print a value a la the %b format of the kernel's printf
560  */
561 printb(s, v, bits)
562 	char *s;
563 	register char *bits;
564 	register unsigned short v;
565 {
566 	register int i, any = 0;
567 	register char c;
568 
569 	if (bits && *bits == 8)
570 		printf("%s=%o", s, v);
571 	else
572 		printf("%s=%x", s, v);
573 	bits++;
574 	if (bits) {
575 		putchar('<');
576 		while (i = *bits++) {
577 			if (v & (1 << (i-1))) {
578 				if (any)
579 					putchar(',');
580 				any = 1;
581 				for (; (c = *bits) > 32; bits++)
582 					putchar(c);
583 			} else
584 				for (; *bits > 32; bits++)
585 					;
586 		}
587 		putchar('>');
588 	}
589 }
590 
591 #define SNS(x) ((struct sockaddr_ns *) &(x))
592 struct sockaddr_ns *snstab[] = {
593 SNS(ridreq.ifr_addr), SNS(addreq.ifra_addr),
594 SNS(addreq.ifra_mask), SNS(addreq.ifra_broadaddr)};
595 
596 xns_getaddr(addr, which)
597 char *addr;
598 {
599 	struct sockaddr_ns *sns = snstab[which];
600 	struct ns_addr ns_addr();
601 
602 	sns->sns_family = AF_NS;
603 	sns->sns_len = sizeof(*sns);
604 	sns->sns_addr = ns_addr(addr);
605 	if (which == MASK)
606 		printf("Attempt to set XNS netmask will be ineffectual\n");
607 }
608 
609 #define SISO(x) ((struct sockaddr_iso *) &(x))
610 struct sockaddr_iso *sisotab[] = {
611 SISO(iso_ridreq.ifr_Addr), SISO(iso_addreq.ifra_addr),
612 SISO(iso_addreq.ifra_mask), SISO(iso_addreq.ifra_dstaddr)};
613 
614 iso_getaddr(addr, which)
615 char *addr;
616 {
617 	register struct sockaddr_iso *siso = sisotab[which];
618 	struct iso_addr *iso_addr();
619 	siso->siso_addr = *iso_addr(addr);
620 
621 	if (which == MASK) {
622 		siso->siso_len = TSEL(siso) - (caddr_t)(siso);
623 		siso->siso_nlen = 0;
624 	} else {
625 		siso->siso_len = sizeof(*siso);
626 		siso->siso_family = AF_ISO;
627 	}
628 }
629 
630 setnsellength(val)
631 	char *val;
632 {
633 	nsellength = atoi(val);
634 	if (nsellength < 0)
635 		errx(1, "Negative NSEL length is absurd");
636 	if (afp == 0 || afp->af_af != AF_ISO)
637 		errx(1, "Setting NSEL length valid only for iso");
638 }
639 
640 fixnsel(s)
641 register struct sockaddr_iso *s;
642 {
643 	if (s->siso_family == 0)
644 		return;
645 	s->siso_tlen = nsellength;
646 }
647 
648 adjust_nsellength()
649 {
650 	fixnsel(sisotab[RIDADDR]);
651 	fixnsel(sisotab[ADDR]);
652 	fixnsel(sisotab[DSTADDR]);
653 }
654