xref: /original-bsd/sbin/ifconfig/ifconfig.c (revision e59fb703) 
1 /*
2  * Copyright (c) 1983 The Regents of the University of California.
3  * All rights reserved.
4  *
5  * %sccs.include.redist.c%
6  */
7 
8 #ifndef lint
9 char copyright[] =
10 "@(#) Copyright (c) 1983 The Regents of the University of California.\n\
11  All rights reserved.\n";
12 #endif /* not lint */
13 
14 #ifndef lint
15 static char sccsid[] = "@(#)ifconfig.c	5.4 (Berkeley) 10/16/91";
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 <unistd.h>
37 #include <stdio.h>
38 #include <errno.h>
39 #include <ctype.h>
40 #include <stdlib.h>
41 #include <string.h>
42 
43 struct	ifreq		ifr, ridreq;
44 struct	ifaliasreq	addreq;
45 struct	iso_ifreq	iso_ridreq;
46 struct	iso_aliasreq	iso_addreq;
47 struct	sockaddr_in	netmask;
48 
49 char	name[30];
50 int	flags;
51 int	metric;
52 int	nsellength = 1;
53 int	setaddr;
54 int	setipdst;
55 int	doalias;
56 int	clearaddr;
57 int	newaddr = 1;
58 int	s;
59 extern	int errno;
60 
61 int	setifflags(), setifaddr(), setifdstaddr(), setifnetmask();
62 int	setifmetric(), setifbroadaddr(), setifipdst();
63 int	notealias(), setsnpaoffset(), setnsellength();
64 
65 #define	NEXTARG		0xffffff
66 
67 struct	cmd {
68 	char	*c_name;
69 	int	c_parameter;		/* NEXTARG means next argv */
70 	int	(*c_func)();
71 } cmds[] = {
72 	{ "up",		IFF_UP,		setifflags } ,
73 	{ "down",	-IFF_UP,	setifflags },
74 	{ "trailers",	-IFF_NOTRAILERS,setifflags },
75 	{ "-trailers",	IFF_NOTRAILERS,	setifflags },
76 	{ "arp",	-IFF_NOARP,	setifflags },
77 	{ "-arp",	IFF_NOARP,	setifflags },
78 	{ "debug",	IFF_DEBUG,	setifflags },
79 	{ "-debug",	-IFF_DEBUG,	setifflags },
80 	{ "alias",	IFF_UP,		notealias },
81 	{ "-alias",	-IFF_UP,	notealias },
82 	{ "delete",	-IFF_UP,	notealias },
83 #ifdef notdef
84 #define	EN_SWABIPS	0x1000
85 	{ "swabips",	EN_SWABIPS,	setifflags },
86 	{ "-swabips",	-EN_SWABIPS,	setifflags },
87 #endif
88 	{ "netmask",	NEXTARG,	setifnetmask },
89 	{ "metric",	NEXTARG,	setifmetric },
90 	{ "broadcast",	NEXTARG,	setifbroadaddr },
91 	{ "ipdst",	NEXTARG,	setifipdst },
92 	{ "snpaoffset",	NEXTARG,	setsnpaoffset },
93 	{ "nsellength",	NEXTARG,	setnsellength },
94 	{ "llc0",	IFF_LLC0,	setifflags } ,
95 	{ "-llc0",	-IFF_LLC0,	setifflags } ,
96 	{ "llc1",	IFF_LLC1,	setifflags } ,
97 	{ "-llc1",	-IFF_LLC1,	setifflags } ,
98 	{ "llc2",	IFF_LLC2,	setifflags } ,
99 	{ "-llc2",	-IFF_LLC2,	setifflags } ,
100 	{ 0,		0,		setifaddr },
101 	{ 0,		0,		setifdstaddr },
102 };
103 
104 /*
105  * XNS support liberally adapted from
106  * code written at the University of Maryland
107  * 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%s",
145 		    "\t[ af [ address [ dest_addr ] ] [ up ] [ down ]",
146 			    "[ netmask mask ] ]\n",
147 		    "\t[ metric n ]\n",
148 		    "\t[ trailers | -trailers ]\n",
149 		    "\t[ arp | -arp ]\n",
150 		    "\t[ llc0 | -llc0 ] [ llc1 | -llc1 ] [ llc2 | -llc2 ] \n");
151 		exit(1);
152 	}
153 	argc--, argv++;
154 	strncpy(name, *argv, sizeof(name));
155 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
156 	argc--, argv++;
157 	if (argc > 0) {
158 		for (afp = rafp = afs; rafp->af_name; rafp++)
159 			if (strcmp(rafp->af_name, *argv) == 0) {
160 				afp = rafp; argc--; argv++;
161 				break;
162 			}
163 		rafp = afp;
164 		af = ifr.ifr_addr.sa_family = rafp->af_af;
165 	}
166 	s = socket(af, SOCK_DGRAM, 0);
167 	if (s < 0) {
168 		perror("ifconfig: socket");
169 		exit(1);
170 	}
171 	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
172 		Perror("ioctl (SIOCGIFFLAGS)");
173 		exit(1);
174 	}
175 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
176 	flags = ifr.ifr_flags;
177 	if (ioctl(s, SIOCGIFMETRIC, (caddr_t)&ifr) < 0)
178 		perror("ioctl (SIOCGIFMETRIC)");
179 	else
180 		metric = ifr.ifr_metric;
181 	if (argc == 0) {
182 		status();
183 		exit(0);
184 	}
185 	while (argc > 0) {
186 		register struct cmd *p;
187 
188 		for (p = cmds; p->c_name; p++)
189 			if (strcmp(*argv, p->c_name) == 0)
190 				break;
191 		if (p->c_name == 0 && setaddr)
192 			p++;	/* got src, do dst */
193 		if (p->c_func) {
194 			if (p->c_parameter == NEXTARG) {
195 				(*p->c_func)(argv[1]);
196 				argc--, argv++;
197 			} else
198 				(*p->c_func)(*argv, p->c_parameter);
199 		}
200 		argc--, argv++;
201 	}
202 	if (af == AF_ISO)
203 		adjust_nsellength();
204 	if (setipdst && af==AF_NS) {
205 		struct nsip_req rq;
206 		int size = sizeof(rq);
207 
208 		rq.rq_ns = addreq.ifra_addr;
209 		rq.rq_ip = addreq.ifra_dstaddr;
210 
211 		if (setsockopt(s, 0, SO_NSIP_ROUTE, &rq, size) < 0)
212 			Perror("Encapsulation Routing");
213 	}
214 	if (clearaddr) {
215 		int ret;
216 		strncpy(rafp->af_ridreq, name, sizeof ifr.ifr_name);
217 		if ((ret = ioctl(s, rafp->af_difaddr, rafp->af_ridreq)) < 0) {
218 			if (errno == EADDRNOTAVAIL && (doalias >= 0)) {
219 				/* means no previous address for interface */
220 			} else
221 				Perror("ioctl (SIOCDIFADDR)");
222 		}
223 	}
224 	if (newaddr) {
225 		strncpy(rafp->af_addreq, name, sizeof ifr.ifr_name);
226 		if (ioctl(s, rafp->af_aifaddr, rafp->af_addreq) < 0)
227 			Perror("ioctl (SIOCAIFADDR)");
228 	}
229 	exit(0);
230 }
231 #define RIDADDR 0
232 #define ADDR	1
233 #define MASK	2
234 #define DSTADDR	3
235 
236 /*ARGSUSED*/
237 setifaddr(addr, param)
238 	char *addr;
239 	short param;
240 {
241 	/*
242 	 * Delay the ioctl to set the interface addr until flags are all set.
243 	 * The address interpretation may depend on the flags,
244 	 * and the flags may change when the address is set.
245 	 */
246 	setaddr++;
247 	if (doalias == 0)
248 		clearaddr = 1;
249 	(*afp->af_getaddr)(addr, (doalias >= 0 ? ADDR : RIDADDR));
250 }
251 
252 setifnetmask(addr)
253 	char *addr;
254 {
255 	(*afp->af_getaddr)(addr, MASK);
256 }
257 
258 setifbroadaddr(addr)
259 	char *addr;
260 {
261 	(*afp->af_getaddr)(addr, DSTADDR);
262 }
263 
264 setifipdst(addr)
265 	char *addr;
266 {
267 	in_getaddr(addr, DSTADDR);
268 	setipdst++;
269 	clearaddr = 0;
270 	newaddr = 0;
271 }
272 #define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
273 /*ARGSUSED*/
274 notealias(addr, param)
275 	char *addr;
276 {
277 	if (setaddr && doalias == 0 && param < 0)
278 		bcopy((caddr_t)rqtosa(af_addreq),
279 		      (caddr_t)rqtosa(af_ridreq),
280 		      rqtosa(af_addreq)->sa_len);
281 	doalias = param;
282 	if (param < 0) {
283 		clearaddr = 1;
284 		newaddr = 0;
285 	} else
286 		clearaddr = 0;
287 }
288 
289 /*ARGSUSED*/
290 setifdstaddr(addr, param)
291 	char *addr;
292 	int param;
293 {
294 	(*afp->af_getaddr)(addr, DSTADDR);
295 }
296 
297 setifflags(vname, value)
298 	char *vname;
299 	short value;
300 {
301  	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
302  		Perror("ioctl (SIOCGIFFLAGS)");
303  		exit(1);
304  	}
305 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
306  	flags = ifr.ifr_flags;
307 
308 	if (value < 0) {
309 		value = -value;
310 		flags &= ~value;
311 	} else
312 		flags |= value;
313 	ifr.ifr_flags = flags;
314 	if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
315 		Perror(vname);
316 }
317 
318 setifmetric(val)
319 	char *val;
320 {
321 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
322 	ifr.ifr_metric = atoi(val);
323 	if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
324 		perror("ioctl (set metric)");
325 }
326 
327 setsnpaoffset(val)
328 	char *val;
329 {
330 	iso_addreq.ifra_snpaoffset = atoi(val);
331 }
332 
333 #define	IFFBITS \
334 "\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6NOTRAILERS\7RUNNING\10NOARP\
335 \11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX\15LLC0\16LLC1\16LLC2"
336 
337 /*
338  * Print the status of the interface.  If an address family was
339  * specified, show it and it only; otherwise, show them all.
340  */
341 status()
342 {
343 	register struct afswtch *p = afp;
344 	short af = ifr.ifr_addr.sa_family;
345 
346 	printf("%s: ", name);
347 	printb("flags", flags, IFFBITS);
348 	if (metric)
349 		printf(" metric %d", metric);
350 	putchar('\n');
351 	if ((p = afp) != NULL) {
352 		(*p->af_status)(1);
353 	} else for (p = afs; p->af_name; p++) {
354 		ifr.ifr_addr.sa_family = p->af_af;
355 		(*p->af_status)(0);
356 	}
357 }
358 
359 in_status(force)
360 	int force;
361 {
362 	struct sockaddr_in *sin;
363 	char *inet_ntoa();
364 
365 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
366 	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
367 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
368 			if (!force)
369 				return;
370 			bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
371 		} else
372 			perror("ioctl (SIOCGIFADDR)");
373 	}
374 	sin = (struct sockaddr_in *)&ifr.ifr_addr;
375 	printf("\tinet %s ", inet_ntoa(sin->sin_addr));
376 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
377 	if (ioctl(s, SIOCGIFNETMASK, (caddr_t)&ifr) < 0) {
378 		if (errno != EADDRNOTAVAIL)
379 			perror("ioctl (SIOCGIFNETMASK)");
380 		bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
381 	} else
382 		netmask.sin_addr =
383 		    ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
384 	if (flags & IFF_POINTOPOINT) {
385 		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
386 			if (errno == EADDRNOTAVAIL)
387 			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
388 			else
389 			    perror("ioctl (SIOCGIFDSTADDR)");
390 		}
391 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
392 		sin = (struct sockaddr_in *)&ifr.ifr_dstaddr;
393 		printf("--> %s ", inet_ntoa(sin->sin_addr));
394 	}
395 	printf("netmask %x ", ntohl(netmask.sin_addr.s_addr));
396 	if (flags & IFF_BROADCAST) {
397 		if (ioctl(s, SIOCGIFBRDADDR, (caddr_t)&ifr) < 0) {
398 			if (errno == EADDRNOTAVAIL)
399 			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
400 			else
401 			    perror("ioctl (SIOCGIFADDR)");
402 		}
403 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
404 		sin = (struct sockaddr_in *)&ifr.ifr_addr;
405 		if (sin->sin_addr.s_addr != 0)
406 			printf("broadcast %s", inet_ntoa(sin->sin_addr));
407 	}
408 	putchar('\n');
409 }
410 
411 
412 xns_status(force)
413 	int force;
414 {
415 	struct sockaddr_ns *sns;
416 
417 	close(s);
418 	s = socket(AF_NS, SOCK_DGRAM, 0);
419 	if (s < 0) {
420 		if (errno == EPROTONOSUPPORT)
421 			return;
422 		perror("ifconfig: socket");
423 		exit(1);
424 	}
425 	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
426 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
427 			if (!force)
428 				return;
429 			bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
430 		} else
431 			perror("ioctl (SIOCGIFADDR)");
432 	}
433 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
434 	sns = (struct sockaddr_ns *)&ifr.ifr_addr;
435 	printf("\tns %s ", ns_ntoa(sns->sns_addr));
436 	if (flags & IFF_POINTOPOINT) { /* by W. Nesheim@Cornell */
437 		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
438 			if (errno == EADDRNOTAVAIL)
439 			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
440 			else
441 			    Perror("ioctl (SIOCGIFDSTADDR)");
442 		}
443 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
444 		sns = (struct sockaddr_ns *)&ifr.ifr_dstaddr;
445 		printf("--> %s ", ns_ntoa(sns->sns_addr));
446 	}
447 	putchar('\n');
448 }
449 
450 iso_status(force)
451 	int force;
452 {
453 	struct sockaddr_iso *siso;
454 	struct iso_ifreq ifr;
455 
456 	close(s);
457 	s = socket(AF_ISO, SOCK_DGRAM, 0);
458 	if (s < 0) {
459 		if (errno == EPROTONOSUPPORT)
460 			return;
461 		perror("ifconfig: socket");
462 		exit(1);
463 	}
464 	bzero((caddr_t)&ifr, sizeof(ifr));
465 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
466 	if (ioctl(s, SIOCGIFADDR_ISO, (caddr_t)&ifr) < 0) {
467 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
468 			if (!force)
469 				return;
470 			bzero((char *)&ifr.ifr_Addr, sizeof(ifr.ifr_Addr));
471 		} else {
472 			perror("ioctl (SIOCGIFADDR_ISO)");
473 			exit(1);
474 		}
475 	}
476 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
477 	siso = &ifr.ifr_Addr;
478 	printf("\tiso %s ", iso_ntoa(&siso->siso_addr));
479 	if (ioctl(s, SIOCGIFNETMASK_ISO, (caddr_t)&ifr) < 0) {
480 		if (errno != EADDRNOTAVAIL)
481 			perror("ioctl (SIOCGIFNETMASK_ISO)");
482 	} else {
483 		printf(" netmask %s ", iso_ntoa(&siso->siso_addr));
484 	}
485 	if (flags & IFF_POINTOPOINT) {
486 		if (ioctl(s, SIOCGIFDSTADDR_ISO, (caddr_t)&ifr) < 0) {
487 			if (errno == EADDRNOTAVAIL)
488 			    bzero((char *)&ifr.ifr_Addr, sizeof(ifr.ifr_Addr));
489 			else
490 			    Perror("ioctl (SIOCGIFDSTADDR_ISO)");
491 		}
492 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
493 		siso = &ifr.ifr_Addr;
494 		printf("--> %s ", iso_ntoa(&siso->siso_addr));
495 	}
496 	putchar('\n');
497 }
498 
499 Perror(cmd)
500 	char *cmd;
501 {
502 	extern int errno;
503 
504 	fprintf(stderr, "ifconfig: ");
505 	switch (errno) {
506 
507 	case ENXIO:
508 		fprintf(stderr, "%s: no such interface\n", cmd);
509 		break;
510 
511 	case EPERM:
512 		fprintf(stderr, "%s: permission denied\n", cmd);
513 		break;
514 
515 	default:
516 		perror(cmd);
517 	}
518 	exit(1);
519 }
520 
521 struct	in_addr inet_makeaddr();
522 
523 #define SIN(x) ((struct sockaddr_in *) &(x))
524 struct sockaddr_in *sintab[] = {
525 SIN(ridreq.ifr_addr), SIN(addreq.ifra_addr),
526 SIN(addreq.ifra_mask), SIN(addreq.ifra_broadaddr)};
527 
528 in_getaddr(s, which)
529 	char *s;
530 {
531 	register struct sockaddr_in *sin = sintab[which];
532 	struct hostent *hp;
533 	struct netent *np;
534 	int val;
535 
536 	sin->sin_len = sizeof(*sin);
537 	if (which != MASK)
538 		sin->sin_family = AF_INET;
539 
540 	if ((val = inet_addr(s)) != -1)
541 		sin->sin_addr.s_addr = val;
542 	else if (hp = gethostbyname(s))
543 		bcopy(hp->h_addr, (char *)&sin->sin_addr, hp->h_length);
544 	else if (np = getnetbyname(s))
545 		sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
546 	else {
547 		fprintf(stderr, "%s: bad value\n", s);
548 		exit(1);
549 	}
550 }
551 
552 /*
553  * Print a value a la the %b format of the kernel's printf
554  */
555 printb(s, v, bits)
556 	char *s;
557 	register char *bits;
558 	register unsigned short v;
559 {
560 	register int i, any = 0;
561 	register char c;
562 
563 	if (bits && *bits == 8)
564 		printf("%s=%o", s, v);
565 	else
566 		printf("%s=%x", s, v);
567 	bits++;
568 	if (bits) {
569 		putchar('<');
570 		while (i = *bits++) {
571 			if (v & (1 << (i-1))) {
572 				if (any)
573 					putchar(',');
574 				any = 1;
575 				for (; (c = *bits) > 32; bits++)
576 					putchar(c);
577 			} else
578 				for (; *bits > 32; bits++)
579 					;
580 		}
581 		putchar('>');
582 	}
583 }
584 
585 #define SNS(x) ((struct sockaddr_ns *) &(x))
586 struct sockaddr_ns *snstab[] = {
587 SNS(ridreq.ifr_addr), SNS(addreq.ifra_addr),
588 SNS(addreq.ifra_mask), SNS(addreq.ifra_broadaddr)};
589 
590 xns_getaddr(addr, which)
591 char *addr;
592 {
593 	struct sockaddr_ns *sns = snstab[which];
594 	struct ns_addr ns_addr();
595 
596 	sns->sns_family = AF_NS;
597 	sns->sns_len = sizeof(*sns);
598 	sns->sns_addr = ns_addr(addr);
599 	if (which == MASK)
600 		printf("Attempt to set XNS netmask will be ineffectual\n");
601 }
602 
603 #define SISO(x) ((struct sockaddr_iso *) &(x))
604 struct sockaddr_iso *sisotab[] = {
605 SISO(iso_ridreq.ifr_Addr), SISO(iso_addreq.ifra_addr),
606 SISO(iso_addreq.ifra_mask), SISO(iso_addreq.ifra_dstaddr)};
607 
608 iso_getaddr(addr, which)
609 char *addr;
610 {
611 	register struct sockaddr_iso *siso = sisotab[which];
612 	struct iso_addr *iso_addr();
613 	siso->siso_addr = *iso_addr(addr);
614 
615 	if (which == MASK) {
616 		siso->siso_len = TSEL(siso) - (caddr_t)(siso);
617 		siso->siso_nlen = 0;
618 	} else {
619 		siso->siso_len = sizeof(*siso);
620 		siso->siso_family = AF_ISO;
621 	}
622 }
623 
624 setnsellength(val)
625 	char *val;
626 {
627 	nsellength = atoi(val);
628 	if (nsellength < 0) {
629 		fprintf(stderr, "Negative NSEL length is absurd\n");
630 		exit (1);
631 	}
632 	if (afp == 0 || afp->af_af != AF_ISO) {
633 		fprintf(stderr, "Setting NSEL length valid only for iso\n");
634 		exit (1);
635 	}
636 }
637 
638 fixnsel(s)
639 register struct sockaddr_iso *s;
640 {
641 	if (s->siso_family == 0)
642 		return;
643 	s->siso_tlen = nsellength;
644 }
645 
646 adjust_nsellength()
647 {
648 	fixnsel(sisotab[RIDADDR]);
649 	fixnsel(sisotab[ADDR]);
650 	fixnsel(sisotab[DSTADDR]);
651 }
652