xref: /openbsd/usr.bin/netstat/show.c (revision 09467b48) 
1 /*	$OpenBSD: show.c,v 1.55 2018/08/31 15:18:02 yasuoka Exp $	*/
2 /*	$NetBSD: show.c,v 1.1 1996/11/15 18:01:41 gwr Exp $	*/
3 
4 /*
5  * Copyright (c) 1983, 1988, 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32 
33 #include <sys/socket.h>
34 #include <sys/sysctl.h>
35 
36 #include <net/if.h>
37 #include <net/if_dl.h>
38 #include <net/if_types.h>
39 #include <net/route.h>
40 #include <netinet/in.h>
41 #include <netinet/if_ether.h>
42 #include <netmpls/mpls.h>
43 #include <arpa/inet.h>
44 
45 #include <err.h>
46 #include <errno.h>
47 #include <netdb.h>
48 #include <stdio.h>
49 #include <stddef.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <unistd.h>
53 #include <limits.h>
54 
55 #include "netstat.h"
56 
57 char	*any_ntoa(const struct sockaddr *);
58 char	*link_print(struct sockaddr *);
59 char	*label_print(struct sockaddr *);
60 
61 #define ROUNDUP(a) \
62 	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
63 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
64 
65 /*
66  * Definitions for showing gateway flags.
67  */
68 struct bits {
69 	int	b_mask;
70 	char	b_val;
71 };
72 static const struct bits bits[] = {
73 	{ RTF_UP,	'U' },
74 	{ RTF_GATEWAY,	'G' },
75 	{ RTF_HOST,	'H' },
76 	{ RTF_REJECT,	'R' },
77 	{ RTF_DYNAMIC,	'D' },
78 	{ RTF_MODIFIED,	'M' },
79 	{ RTF_DONE,	'd' }, /* Completed -- for routing messages only */
80 	{ RTF_CLONING,	'C' },
81 	{ RTF_MULTICAST,'m' },
82 	{ RTF_LLINFO,	'L' },
83 	{ RTF_STATIC,	'S' },
84 	{ RTF_BLACKHOLE,'B' },
85 	{ RTF_PROTO3,	'3' },
86 	{ RTF_PROTO2,	'2' },
87 	{ RTF_PROTO1,	'1' },
88 	{ RTF_CLONED,	'c' },
89 	{ RTF_CACHED,	'h' },
90 	{ RTF_MPATH,	'P' },
91 	{ RTF_MPLS,	'T' },
92 	{ RTF_LOCAL,	'l' },
93 	{ RTF_BFD,	'F' },
94 	{ RTF_BROADCAST,'b' },
95 	{ RTF_CONNECTED,'n' },
96 	{ 0 }
97 };
98 
99 int	 WID_DST(int);
100 void	 p_rtentry(struct rt_msghdr *);
101 void	 pr_family(int);
102 void	 p_sockaddr(struct sockaddr *, struct sockaddr *, int, int);
103 void	 p_sockaddr_mpls(struct sockaddr *, struct sockaddr *, int, int);
104 void	 p_flags(int, char *);
105 char	*routename4(in_addr_t);
106 char	*routename6(struct sockaddr_in6 *);
107 
108 size_t
109 get_sysctl(const int *mib, u_int mcnt, char **buf)
110 {
111 	size_t needed;
112 
113 	while (1) {
114 		if (sysctl(mib, mcnt, NULL, &needed, NULL, 0) == -1)
115 			err(1, "sysctl-estimate");
116 		if (needed == 0)
117 			break;
118 		if ((*buf = realloc(*buf, needed)) == NULL)
119 			err(1, NULL);
120 		if (sysctl(mib, mcnt, *buf, &needed, NULL, 0) == -1) {
121 			if (errno == ENOMEM)
122 				continue;
123 			err(1, "sysctl");
124 		}
125 		break;
126 	}
127 
128 	return needed;
129 }
130 
131 /*
132  * Print routing tables.
133  */
134 void
135 p_rttables(int af, u_int tableid)
136 {
137 	struct rt_msghdr *rtm;
138 	char *buf = NULL, *next, *lim = NULL;
139 	size_t needed;
140 	int mib[7], mcnt;
141 
142 	mib[0] = CTL_NET;
143 	mib[1] = PF_ROUTE;
144 	mib[2] = 0;
145 	mib[3] = af;
146 	mib[4] = NET_RT_DUMP;
147 	mib[5] = 0;
148 	mib[6] = tableid;
149 	mcnt = 7;
150 
151 	needed = get_sysctl(mib, mcnt, &buf);
152 	lim = buf + needed;
153 
154 	printf("Routing tables\n");
155 
156 	if (buf) {
157 		for (next = buf; next < lim; next += rtm->rtm_msglen) {
158 			rtm = (struct rt_msghdr *)next;
159 			if (rtm->rtm_version != RTM_VERSION)
160 				continue;
161 			p_rtentry(rtm);
162 		}
163 	}
164 	free(buf);
165 }
166 
167 /*
168  * column widths; each followed by one space
169  * width of destination/gateway column
170  * strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4
171  */
172 #define	WID_GW(af)	((af) == AF_INET6 ? (nflag ? 30 : 18) : 18)
173 
174 int
175 WID_DST(int af)
176 {
177 
178 	if (nflag)
179 		switch (af) {
180 		case AF_MPLS:
181 			return 9;
182 		case AF_INET6:
183 			return 34;
184 		default:
185 			return 18;
186 		}
187 	else
188 		switch (af) {
189 		case AF_MPLS:
190 			return 9;
191  		default:
192 			return 18;
193 		}
194 }
195 
196 /*
197  * Print header for routing table columns.
198  */
199 void
200 pr_rthdr(int af, int Aflag)
201 {
202 	if (Aflag)
203 		printf("%-*.*s ", PLEN, PLEN, "Address");
204 	switch (af) {
205 	case PF_KEY:
206 		printf("%-18s %-5s %-18s %-5s %-5s %-22s\n",
207 		    "Source", "Port", "Destination",
208 		    "Port", "Proto", "SA(Address/Proto/Type/Direction)");
209 		break;
210 	case PF_MPLS:
211 		printf("%-9s %-9s %-6s %-18s %-6.6s %5.5s %8.8s %5.5s  %4.4s %s\n",
212 		    "In label", "Out label", "Op", "Gateway",
213 		    "Flags", "Refs", "Use", "Mtu", "Prio", "Interface");
214 		break;
215 	default:
216 		printf("%-*.*s %-*.*s %-6.6s %5.5s %8.8s %5.5s  %4.4s %s",
217 		    WID_DST(af), WID_DST(af), "Destination",
218 		    WID_GW(af), WID_GW(af), "Gateway",
219 		    "Flags", "Refs", "Use", "Mtu", "Prio", "Iface");
220 		if (vflag && !Aflag)
221 			printf(" %s", "Label");
222 		putchar('\n');
223 		break;
224 	}
225 }
226 
227 static void
228 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
229 {
230 	int	i;
231 
232 	for (i = 0; i < RTAX_MAX; i++) {
233 		if (addrs & (1 << i)) {
234 			rti_info[i] = sa;
235 			sa = (struct sockaddr *)((char *)(sa) +
236 			    ROUNDUP(sa->sa_len));
237 		} else
238 			rti_info[i] = NULL;
239 	}
240 }
241 
242 /*
243  * Print a routing table entry.
244  */
245 void
246 p_rtentry(struct rt_msghdr *rtm)
247 {
248 	static int	 old_af = -1;
249 	struct sockaddr	*sa = (struct sockaddr *)((char *)rtm + rtm->rtm_hdrlen);
250 	struct sockaddr	*mask, *rti_info[RTAX_MAX];
251 	char		 ifbuf[IF_NAMESIZE];
252 
253 	if (sa->sa_family == AF_KEY)
254 		return;
255 
256 	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
257 
258 	if (Fflag && rti_info[RTAX_GATEWAY]->sa_family != sa->sa_family) {
259 		return;
260 	}
261 	if (old_af != sa->sa_family) {
262 		old_af = sa->sa_family;
263 		pr_family(sa->sa_family);
264 		pr_rthdr(sa->sa_family, 0);
265 	}
266 
267 	mask = rti_info[RTAX_NETMASK];
268 	if ((sa = rti_info[RTAX_DST]) == NULL)
269 		return;
270 
271 	p_sockaddr(sa, mask, rtm->rtm_flags, WID_DST(sa->sa_family));
272 	p_sockaddr_mpls(sa, rti_info[RTAX_SRC], rtm->rtm_mpls,
273 	    WID_DST(sa->sa_family));
274 
275 	p_sockaddr(rti_info[RTAX_GATEWAY], NULL, RTF_HOST,
276 	    WID_GW(sa->sa_family));
277 
278 	p_flags(rtm->rtm_flags, "%-6.6s ");
279 	printf("%5u %8llu ", rtm->rtm_rmx.rmx_refcnt,
280 	    rtm->rtm_rmx.rmx_pksent);
281 	if (rtm->rtm_rmx.rmx_mtu)
282 		printf("%5u ", rtm->rtm_rmx.rmx_mtu);
283 	else
284 		printf("%5s ", "-");
285 	putchar((rtm->rtm_rmx.rmx_locks & RTV_MTU) ? 'L' : ' ');
286 	printf("  %2d %-5.16s", rtm->rtm_priority,
287 	    if_indextoname(rtm->rtm_index, ifbuf));
288 	if (vflag && rti_info[RTAX_LABEL])
289 		printf(" %s", ((struct sockaddr_rtlabel *)
290 		    rti_info[RTAX_LABEL])->sr_label);
291 	putchar('\n');
292 }
293 
294 /*
295  * Print address family header before a section of the routing table.
296  */
297 void
298 pr_family(int af)
299 {
300 	char *afname;
301 
302 	switch (af) {
303 	case AF_INET:
304 		afname = "Internet";
305 		break;
306 	case AF_INET6:
307 		afname = "Internet6";
308 		break;
309 	case PF_KEY:
310 		afname = "Encap";
311 		break;
312 	case AF_MPLS:
313 		afname = "MPLS";
314 		break;
315 	default:
316 		afname = NULL;
317 		break;
318 	}
319 	if (afname)
320 		printf("\n%s:\n", afname);
321 	else
322 		printf("\nProtocol Family %d:\n", af);
323 }
324 
325 void
326 p_addr(struct sockaddr *sa, struct sockaddr *mask, int flags)
327 {
328 	p_sockaddr(sa, mask, flags, WID_DST(sa->sa_family));
329 }
330 
331 void
332 p_gwaddr(struct sockaddr *sa, int af)
333 {
334 	p_sockaddr(sa, 0, RTF_HOST, WID_GW(af));
335 }
336 
337 void
338 p_sockaddr(struct sockaddr *sa, struct sockaddr *mask, int flags, int width)
339 {
340 	char *cp;
341 
342 	switch (sa->sa_family) {
343 	case AF_INET6:
344 	    {
345 		struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
346 		struct in6_addr *in6 = &sa6->sin6_addr;
347 
348 		/*
349 		 * XXX: This is a special workaround for KAME kernels.
350 		 * sin6_scope_id field of SA should be set in the future.
351 		 */
352 		if (IN6_IS_ADDR_LINKLOCAL(in6) ||
353 		    IN6_IS_ADDR_MC_LINKLOCAL(in6) ||
354 		    IN6_IS_ADDR_MC_INTFACELOCAL(in6)) {
355 			/* XXX: override is ok? */
356 			sa6->sin6_scope_id = (u_int32_t)ntohs(*(u_short *)
357 			    &in6->s6_addr[2]);
358 			*(u_short *)&in6->s6_addr[2] = 0;
359 		}
360 		if (flags & RTF_HOST)
361 			cp = routename((struct sockaddr *)sa6);
362 		else
363 			cp = netname((struct sockaddr *)sa6, mask);
364 		break;
365 	    }
366 	case AF_MPLS:
367 		return;
368 	default:
369 		if ((flags & RTF_HOST) || mask == NULL)
370 			cp = routename(sa);
371 		else
372 			cp = netname(sa, mask);
373 		break;
374 	}
375 	if (width < 0)
376 		printf("%s", cp);
377 	else {
378 		if (nflag)
379 			printf("%-*s ", width, cp);
380 		else
381 			printf("%-*.*s ", width, width, cp);
382 	}
383 }
384 
385 static char line[HOST_NAME_MAX+1];
386 static char domain[HOST_NAME_MAX+1];
387 
388 void
389 p_sockaddr_mpls(struct sockaddr *in, struct sockaddr *out, int flags, int width)
390 {
391 	if (in->sa_family != AF_MPLS)
392 		return;
393 
394 	if (flags & MPLS_OP_POP || flags == MPLS_OP_LOCAL) {
395 		printf("%-*s ", width, label_print(in));
396 		printf("%-*s ", width, label_print(NULL));
397 	} else {
398 		printf("%-*s ", width, label_print(in));
399 		printf("%-*s ", width, label_print(out));
400 	}
401 
402 	printf("%-6s ", mpls_op(flags));
403 }
404 
405 void
406 p_flags(int f, char *format)
407 {
408 	char name[33], *flags;
409 	const struct bits *p = bits;
410 
411 	for (flags = name; p->b_mask && flags < &name[sizeof(name) - 2]; p++)
412 		if (p->b_mask & f)
413 			*flags++ = p->b_val;
414 	*flags = '\0';
415 	printf(format, name);
416 }
417 
418 char *
419 routename(struct sockaddr *sa)
420 {
421 	char *cp = NULL;
422 	static int first = 1;
423 
424 	if (first) {
425 		first = 0;
426 		if (gethostname(domain, sizeof(domain)) == 0 &&
427 		    (cp = strchr(domain, '.')))
428 			(void)strlcpy(domain, cp + 1, sizeof(domain));
429 		else
430 			domain[0] = '\0';
431 		cp = NULL;
432 	}
433 
434 	if (sa->sa_len == 0) {
435 		(void)strlcpy(line, "default", sizeof(line));
436 		return (line);
437 	}
438 
439 	switch (sa->sa_family) {
440 	case AF_INET:
441 		return
442 		    (routename4(((struct sockaddr_in *)sa)->sin_addr.s_addr));
443 
444 	case AF_INET6:
445 	    {
446 		struct sockaddr_in6 sin6;
447 
448 		memset(&sin6, 0, sizeof(sin6));
449 		memcpy(&sin6, sa, sa->sa_len);
450 		sin6.sin6_family = AF_INET6;
451 		if (sa->sa_len == sizeof(struct sockaddr_in6) &&
452 		    (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
453 		     IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr) ||
454 		     IN6_IS_ADDR_MC_INTFACELOCAL(&sin6.sin6_addr)) &&
455 		    sin6.sin6_scope_id == 0) {
456 			sin6.sin6_scope_id =
457 			    ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
458 			sin6.sin6_addr.s6_addr[2] = 0;
459 			sin6.sin6_addr.s6_addr[3] = 0;
460 		}
461 		return (routename6(&sin6));
462 	    }
463 
464 	case AF_LINK:
465 		return (link_print(sa));
466 	case AF_MPLS:
467 		return (label_print(sa));
468 	case AF_UNSPEC:
469 		if (sa->sa_len == sizeof(struct sockaddr_rtlabel)) {
470 			static char name[RTLABEL_LEN];
471 			struct sockaddr_rtlabel *sr;
472 
473 			sr = (struct sockaddr_rtlabel *)sa;
474 			(void)strlcpy(name, sr->sr_label, sizeof(name));
475 			return (name);
476 		}
477 		/* FALLTHROUGH */
478 	default:
479 		(void)snprintf(line, sizeof(line), "(%d) %s",
480 		    sa->sa_family, any_ntoa(sa));
481 		break;
482 	}
483 	return (line);
484 }
485 
486 char *
487 routename4(in_addr_t in)
488 {
489 	char		*cp = NULL;
490 	struct in_addr	 ina;
491 	struct hostent	*hp;
492 
493 	if (!cp && !nflag) {
494 		if ((hp = gethostbyaddr((char *)&in,
495 		    sizeof(in), AF_INET)) != NULL) {
496 			if ((cp = strchr(hp->h_name, '.')) &&
497 			    !strcmp(cp + 1, domain))
498 				*cp = '\0';
499 			cp = hp->h_name;
500 		}
501 	}
502 	ina.s_addr = in;
503 	strlcpy(line, cp ? cp : inet_ntoa(ina), sizeof(line));
504 
505 	return (line);
506 }
507 
508 char *
509 routename6(struct sockaddr_in6 *sin6)
510 {
511 	int	 niflags = 0;
512 
513 	if (nflag)
514 		niflags |= NI_NUMERICHOST;
515 	else
516 		niflags |= NI_NOFQDN;
517 
518 	if (getnameinfo((struct sockaddr *)sin6, sizeof(*sin6),
519 	    line, sizeof(line), NULL, 0, niflags) != 0)
520 		strncpy(line, "invalid", sizeof(line));
521 
522 	return (line);
523 }
524 
525 /*
526  * Return the name of the network whose address is given.
527  * The address is assumed to be that of a net or subnet, not a host.
528  */
529 char *
530 netname4(in_addr_t in, in_addr_t mask)
531 {
532 	int mbits;
533 
534 	in = ntohl(in);
535 	mask = ntohl(mask);
536 	mbits = mask ? 33 - ffs(mask) : 0;
537 	if (in == INADDR_ANY && mask == INADDR_ANY)
538 		strlcpy(line, "default", sizeof(line));
539 #define C(x)	((x) & 0xff)
540 	else if (mbits < 9)
541 		snprintf(line, sizeof(line), "%u/%d", C(in >> 24), mbits);
542 	else if (mbits < 17)
543 		snprintf(line, sizeof(line), "%u.%u/%d",
544 		    C(in >> 24) , C(in >> 16), mbits);
545 	else if (mbits < 25)
546 		snprintf(line, sizeof(line), "%u.%u.%u/%d",
547 		    C(in >> 24), C(in >> 16), C(in >> 8), mbits);
548 	else
549 		snprintf(line, sizeof(line), "%u.%u.%u.%u/%d", C(in >> 24),
550 		    C(in >> 16), C(in >> 8), C(in), mbits);
551 #undef C
552 	return (line);
553 }
554 
555 char *
556 netname6(struct sockaddr_in6 *sa6, struct sockaddr_in6 *mask)
557 {
558 	struct sockaddr_in6 sin6;
559 	u_char *p;
560 	int masklen, final = 0, illegal = 0;
561 	int i, lim, flag, error;
562 	char hbuf[NI_MAXHOST];
563 
564 	sin6 = *sa6;
565 
566 	flag = 0;
567 	masklen = 0;
568 	if (mask) {
569 		lim = mask->sin6_len - offsetof(struct sockaddr_in6, sin6_addr);
570 		lim = lim < (int)sizeof(struct in6_addr) ?
571 		    lim : (int)sizeof(struct in6_addr);
572 		for (p = (u_char *)&mask->sin6_addr, i = 0; i < lim; p++) {
573 			if (final && *p) {
574 				illegal++;
575 				sin6.sin6_addr.s6_addr[i++] = 0x00;
576 				continue;
577 			}
578 
579 			switch (*p & 0xff) {
580 			case 0xff:
581 				masklen += 8;
582 				break;
583 			case 0xfe:
584 				masklen += 7;
585 				final++;
586 				break;
587 			case 0xfc:
588 				masklen += 6;
589 				final++;
590 				break;
591 			case 0xf8:
592 				masklen += 5;
593 				final++;
594 				break;
595 			case 0xf0:
596 				masklen += 4;
597 				final++;
598 				break;
599 			case 0xe0:
600 				masklen += 3;
601 				final++;
602 				break;
603 			case 0xc0:
604 				masklen += 2;
605 				final++;
606 				break;
607 			case 0x80:
608 				masklen += 1;
609 				final++;
610 				break;
611 			case 0x00:
612 				final++;
613 				break;
614 			default:
615 				final++;
616 				illegal++;
617 				break;
618 			}
619 
620 			if (!illegal)
621 				sin6.sin6_addr.s6_addr[i++] &= *p;
622 			else
623 				sin6.sin6_addr.s6_addr[i++] = 0x00;
624 		}
625 		while (i < (int)sizeof(struct in6_addr))
626 			sin6.sin6_addr.s6_addr[i++] = 0x00;
627 	} else
628 		masklen = 128;
629 
630 	if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr))
631 		return ("default");
632 
633 	if (illegal)
634 		warnx("illegal prefixlen");
635 
636 	if (nflag)
637 		flag |= NI_NUMERICHOST;
638 	error = getnameinfo((struct sockaddr *)&sin6, sizeof(sin6),
639 	    hbuf, sizeof(hbuf), NULL, 0, flag);
640 	if (error)
641 		snprintf(hbuf, sizeof(hbuf), "invalid");
642 
643 	snprintf(line, sizeof(line), "%s/%d", hbuf, masklen);
644 	return (line);
645 }
646 
647 /*
648  * Return the name of the network whose address is given.
649  * The address is assumed to be that of a net or subnet, not a host.
650  */
651 char *
652 netname(struct sockaddr *sa, struct sockaddr *mask)
653 {
654 	switch (sa->sa_family) {
655 	case AF_INET:
656 		return netname4(((struct sockaddr_in *)sa)->sin_addr.s_addr,
657 		    mask->sa_len == 0 ? 0 :
658 		    ((struct sockaddr_in *)mask)->sin_addr.s_addr);
659 	case AF_INET6:
660 		return netname6((struct sockaddr_in6 *)sa,
661 		    (struct sockaddr_in6 *)mask);
662 	case AF_LINK:
663 		return (link_print(sa));
664 	case AF_MPLS:
665 		return (label_print(sa));
666 	default:
667 		snprintf(line, sizeof(line), "af %d: %s",
668 		    sa->sa_family, any_ntoa(sa));
669 		break;
670 	}
671 	return (line);
672 }
673 
674 static const char hexlist[] = "0123456789abcdef";
675 
676 char *
677 any_ntoa(const struct sockaddr *sa)
678 {
679 	static char obuf[240];
680 	const char *in = sa->sa_data;
681 	char *out = obuf;
682 	int len = sa->sa_len - offsetof(struct sockaddr, sa_data);
683 
684 	*out++ = 'Q';
685 	do {
686 		*out++ = hexlist[(*in >> 4) & 15];
687 		*out++ = hexlist[(*in++)    & 15];
688 		*out++ = '.';
689 	} while (--len > 0 && (out + 3) < &obuf[sizeof(obuf) - 1]);
690 	out[-1] = '\0';
691 	return (obuf);
692 }
693 
694 char *
695 link_print(struct sockaddr *sa)
696 {
697 	struct sockaddr_dl	*sdl = (struct sockaddr_dl *)sa;
698 	u_char			*lla = (u_char *)sdl->sdl_data + sdl->sdl_nlen;
699 
700 	if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
701 	    sdl->sdl_slen == 0) {
702 		(void)snprintf(line, sizeof(line), "link#%d", sdl->sdl_index);
703 		return (line);
704 	}
705 	switch (sdl->sdl_type) {
706 	case IFT_ETHER:
707 	case IFT_CARP:
708 		return (ether_ntoa((struct ether_addr *)lla));
709 	default:
710 		return (link_ntoa(sdl));
711 	}
712 }
713 
714 char *
715 mpls_op(u_int32_t type)
716 {
717 	switch (type & (MPLS_OP_PUSH | MPLS_OP_POP | MPLS_OP_SWAP)) {
718 	case MPLS_OP_LOCAL:
719 		return ("LOCAL");
720 	case MPLS_OP_POP:
721 		return ("POP");
722 	case MPLS_OP_SWAP:
723 		return ("SWAP");
724 	case MPLS_OP_PUSH:
725 		return ("PUSH");
726 	default:
727 		return ("?");
728 	}
729 }
730 
731 char *
732 label_print(struct sockaddr *sa)
733 {
734 	struct sockaddr_mpls	*smpls = (struct sockaddr_mpls *)sa;
735 
736 	if (smpls)
737 		(void)snprintf(line, sizeof(line), "%u",
738 		    ntohl(smpls->smpls_label) >> MPLS_LABEL_OFFSET);
739 	else
740 		(void)snprintf(line, sizeof(line), "-");
741 
742 	return (line);
743 }
744