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rtutil.c revision 1.4.2.2 
      1 /*	$NetBSD: rtutil.c,v 1.4.2.2 2015/01/08 11:01:01 martin Exp $	*/
      2 /*	$OpenBSD: show.c,v 1.1 2006/05/27 19:16:37 claudio 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/param.h>
     34 #include <sys/protosw.h>
     35 #include <sys/socket.h>
     36 #include <sys/mbuf.h>
     37 #include <sys/sysctl.h>
     38 
     39 #include <net/if.h>
     40 #include <net/if_dl.h>
     41 #include <net/if_types.h>
     42 #include <net/pfvar.h>
     43 #include <net/pfkeyv2.h>
     44 #include <net/route.h>
     45 #include <netinet/in.h>
     46 #include <netinet/if_ether.h>
     47 #include <netatalk/at.h>
     48 #include <netmpls/mpls.h>
     49 #include <arpa/inet.h>
     50 
     51 #include <err.h>
     52 #include <errno.h>
     53 #include <netdb.h>
     54 #include <stdio.h>
     55 #include <stddef.h>
     56 #include <stdlib.h>
     57 #include <string.h>
     58 #include <unistd.h>
     59 
     60 #include "prog_ops.h"
     61 #include "rtutil.h"
     62 
     63 
     64 #define PLEN    (LONG_BIT / 4 + 2)
     65 #define PFKEYV2_CHUNK sizeof(u_int64_t)
     66 static char *link_print(const struct sockaddr *);
     67 
     68 /*
     69  * Definitions for showing gateway flags.
     70  */
     71 struct bits {
     72 	int	b_mask;
     73 	char	b_val;
     74 };
     75 static const struct bits bits[] = {
     76 	{ RTF_UP,	'U' },
     77 	{ RTF_GATEWAY,	'G' },
     78 	{ RTF_HOST,	'H' },
     79 	{ RTF_REJECT,	'R' },
     80 	{ RTF_BLACKHOLE, 'B' },
     81 	{ RTF_DYNAMIC,	'D' },
     82 	{ RTF_MODIFIED,	'M' },
     83 	{ RTF_DONE,	'd' }, /* Completed -- for routing messages only */
     84 	{ RTF_MASK,	'm' }, /* Mask Present -- for routing messages only */
     85 	{ RTF_CLONING,	'C' },
     86 	{ RTF_XRESOLVE,	'X' },
     87 	{ RTF_LLINFO,	'L' },
     88 	{ RTF_STATIC,	'S' },
     89 	{ RTF_PROTO1,	'1' },
     90 	{ RTF_PROTO2,	'2' },
     91 	/* { RTF_PROTO3,	'3' }, */
     92 	{ RTF_CLONED,	'c' },
     93 	/* { RTF_JUMBO,	'J' }, */
     94 	{ RTF_ANNOUNCE,	'p' },
     95 	{ 0, 0 }
     96 };
     97 
     98 #ifndef SMALL
     99 static void p_tag(const struct sockaddr *sa);
    100 #endif
    101 static void p_rtentry(struct rt_msghdr *, int, int);
    102 
    103 /*
    104  * Print routing tables.
    105  */
    106 void
    107 p_rttables(int paf, int flags, int pflags, int interesting)
    108 {
    109 	struct rt_msghdr *rtm;
    110 	char *buf = NULL, *next, *lim = NULL;
    111 	size_t needed;
    112 	int mib[6];
    113 	struct sockaddr *sa;
    114 
    115 	mib[0] = CTL_NET;
    116 	mib[1] = PF_ROUTE;
    117 	mib[2] = 0;
    118 	mib[3] = paf;
    119 	mib[4] = NET_RT_DUMP;
    120 	mib[5] = 0;
    121 	if (prog_sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
    122 		err(1, "route-sysctl-estimate");
    123 	if (needed > 0) {
    124 		if ((buf = malloc(needed)) == 0)
    125 			err(1, NULL);
    126 		if (prog_sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
    127 			err(1, "sysctl of routing table");
    128 		lim = buf + needed;
    129 	}
    130 
    131 	printf("Routing tables\n");
    132 
    133 	if (buf) {
    134 		for (next = buf; next < lim; next += rtm->rtm_msglen) {
    135 			rtm = (struct rt_msghdr *)next;
    136 			sa = (struct sockaddr *)(rtm + 1);
    137 			if ((rtm->rtm_flags & pflags) != pflags)
    138 				continue;
    139 			if (paf != AF_UNSPEC && sa->sa_family != paf)
    140 				continue;
    141 			p_rtentry(rtm, flags, interesting);
    142 		}
    143 		free(buf);
    144 		buf = NULL;
    145 	}
    146 
    147 	if (paf != 0 && paf != PF_KEY)
    148 		return;
    149 
    150 #if 0 /* XXX-elad */
    151 	mib[0] = CTL_NET;
    152 	mib[1] = PF_KEY;
    153 	mib[2] = PF_KEY_V2;
    154 	mib[3] = NET_KEY_SPD_DUMP;
    155 	mib[4] = mib[5] = 0;
    156 
    157 	if (prog_sysctl(mib, 4, NULL, &needed, NULL, 0) == -1) {
    158 		if (errno == ENOPROTOOPT)
    159 			return;
    160 		err(1, "spd-sysctl-estimate");
    161 	}
    162 	if (needed > 0) {
    163 		if ((buf = malloc(needed)) == 0)
    164 			err(1, NULL);
    165 		if (prog_sysctl(mib, 4, buf, &needed, NULL, 0) == -1)
    166 			err(1,"sysctl of spd");
    167 		lim = buf + needed;
    168 	}
    169 
    170 	if (buf) {
    171 		printf("\nEncap:\n");
    172 
    173 		for (next = buf; next < lim; next += msg->sadb_msg_len *
    174 		    PFKEYV2_CHUNK) {
    175 			msg = (struct sadb_msg *)next;
    176 			if (msg->sadb_msg_len == 0)
    177 				break;
    178 			p_pfkentry(msg);
    179 		}
    180 		free(buf);
    181 		buf = NULL;
    182 	}
    183 #endif /* 0 */
    184 }
    185 
    186 /*
    187  * column widths; each followed by one space
    188  * width of destination/gateway column
    189  * strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4
    190  */
    191 #ifndef INET6
    192 #define	WID_DST(af)	18	/* width of destination column */
    193 #define	WID_GW(af)	18	/* width of gateway column */
    194 #else
    195 #define	WID_DST(af)	((af) == AF_INET6 ? ((flags & RT_NFLAG) ? 34 : 18) : 18)
    196 #define	WID_GW(af)	((af) == AF_INET6 ? ((flags & RT_NFLAG) ? 30 : 18) : 18)
    197 #endif
    198 
    199 /*
    200  * Print header for routing table columns.
    201  */
    202 void
    203 p_rthdr(int paf, int flags)
    204 {
    205 #ifndef SMALL
    206 	if (flags & RT_AFLAG)
    207 		printf("%-*.*s ", PLEN, PLEN, "Address");
    208 	if (paf == PF_KEY) {
    209 		printf("%-18s %-5s %-18s %-5s %-5s %-22s\n",
    210 		    "Source", "Port", "Destination",
    211 		    "Port", "Proto", "SA(Address/Proto/Type/Direction)");
    212 		return;
    213 	}
    214 	if (flags & RT_TFLAG) {
    215 	    printf("%-*.*s %-*.*s %-6.6s %6.6s %8.8s %6.6s %7.7s"
    216 		" %s\n", WID_DST(paf), WID_DST(paf), "Destination",
    217 		WID_GW(paf), WID_GW(paf), "Gateway",
    218 		"Flags", "Refs", "Use", "Mtu", "Tag", "Interface");
    219 	    return;
    220 	}
    221 #endif
    222 #ifndef SMALL
    223 	printf("%-*.*s %-*.*s %-6.6s %6.6s %8.8s %6.6s %s\n",
    224 	    WID_DST(paf), WID_DST(paf), "Destination",
    225 	    WID_GW(paf), WID_GW(paf), "Gateway",
    226 	    "Flags", "Refs", "Use", "Mtu", "Interface");
    227 #else
    228 	printf("%-*.*s %-*.*s %-6.6s\n",
    229 	    WID_DST(paf), WID_DST(paf), "Destination",
    230 	    WID_GW(paf), WID_GW(paf), "Gateway",
    231 	    "Flags");
    232 #endif
    233 }
    234 
    235 static void
    236 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
    237 {
    238 	int	i;
    239 
    240 	for (i = 0; i < RTAX_MAX; i++) {
    241 		if (addrs & (1 << i)) {
    242 			rti_info[i] = sa;
    243 			sa = (struct sockaddr *)((char *)(sa) +
    244 			    RT_ROUNDUP(sa->sa_len));
    245 		} else
    246 			rti_info[i] = NULL;
    247 	}
    248 }
    249 
    250 /*
    251  * Print a routing table entry.
    252  */
    253 static void
    254 p_rtentry(struct rt_msghdr *rtm, int flags, int interesting)
    255 {
    256 	static int	 old_af = -1;
    257 	struct sockaddr	*sa = (struct sockaddr *)(rtm + 1);
    258 	struct sockaddr	*mask, *rti_info[RTAX_MAX];
    259 #ifndef SMALL
    260 	char		 ifbuf[IF_NAMESIZE];
    261 #endif
    262 
    263 	if (old_af != sa->sa_family) {
    264 		old_af = sa->sa_family;
    265 		p_family(sa->sa_family);
    266 		p_rthdr(sa->sa_family, flags);
    267 	}
    268 	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
    269 
    270 	mask = rti_info[RTAX_NETMASK];
    271 	if ((sa = rti_info[RTAX_DST]) == NULL)
    272 		return;
    273 
    274 	p_sockaddr(sa, mask, rtm->rtm_flags, WID_DST(sa->sa_family), flags);
    275 	p_sockaddr(rti_info[RTAX_GATEWAY], NULL, RTF_HOST,
    276 	    WID_GW(sa->sa_family), flags);
    277 	p_flags(rtm->rtm_flags & interesting);
    278 #if 0 /* XXX-elad */
    279 	printf("%6d %8"PRId64" ", (int)rtm->rtm_rmx.rmx_refcnt,
    280 	    rtm->rtm_rmx.rmx_pksent);
    281 #else
    282 	printf("%6s %8s ", "-", "-");
    283 #endif
    284 #ifndef SMALL
    285 	if (rtm->rtm_rmx.rmx_mtu)
    286 		printf("%6"PRId64, rtm->rtm_rmx.rmx_mtu);
    287 	else
    288 		printf("%6s", "-");
    289 	putchar((rtm->rtm_rmx.rmx_locks & RTV_MTU) ? 'L' : ' ');
    290 	if (flags & RT_TFLAG)
    291 		p_tag(rti_info[RTAX_TAG]);
    292 	printf(" %.16s", if_indextoname(rtm->rtm_index, ifbuf));
    293 	putchar('\n');
    294 	if (flags & RT_VFLAG)
    295 		p_rtrmx(&rtm->rtm_rmx);
    296 #endif
    297 }
    298 
    299 /*
    300  * Print address family header before a section of the routing table.
    301  */
    302 void
    303 p_family(int paf)
    304 {
    305 	const char *afname;
    306 
    307 	switch (paf) {
    308 	case AF_INET:
    309 		afname = "Internet";
    310 		break;
    311 #ifdef INET6
    312 	case AF_INET6:
    313 		afname = "Internet6";
    314 		break;
    315 #endif
    316 	case PF_KEY:
    317 		afname = "Encap";
    318 		break;
    319 	case AF_APPLETALK:
    320 		afname = "AppleTalk";
    321 		break;
    322 #ifndef SMALL
    323 	case AF_MPLS:
    324 		afname = "MPLS";
    325 		break;
    326 #endif
    327 	default:
    328 		afname = NULL;
    329 		break;
    330 	}
    331 	if (afname)
    332 		printf("\n%s:\n", afname);
    333 	else
    334 		printf("\nProtocol Family %d:\n", paf);
    335 }
    336 
    337 void
    338 p_sockaddr(const struct sockaddr *sa, const struct sockaddr *mask, int rflags,
    339     int width, int flags)
    340 {
    341 	char *cp;
    342 
    343 	switch (sa->sa_family) {
    344 #ifdef INET6
    345 	case AF_INET6:
    346 	    {
    347 		struct sockaddr_in6 sa6 = *(const struct sockaddr_in6 *)sa;
    348 
    349 		inet6_getscopeid(&sa6, INET6_IS_ADDR_LINKLOCAL|
    350 		    INET6_IS_ADDR_MC_LINKLOCAL);
    351 		if (rflags & RTF_HOST)
    352 			cp = routename((const struct sockaddr *)&sa6, flags);
    353 		else
    354 			cp = netname((const struct sockaddr *)&sa6, mask, flags);
    355 		break;
    356 	    }
    357 #endif
    358 	default:
    359 		if ((rflags & RTF_HOST) || mask == NULL)
    360 			cp = routename(sa, flags);
    361 		else
    362 			cp = netname(sa, mask, flags);
    363 		break;
    364 	}
    365 	if (width < 0)
    366 		printf("%s", cp);
    367 	else {
    368 		if (flags & RT_NFLAG)
    369 			printf("%-*s ", width, cp);
    370 		else
    371 			printf("%-*.*s ", width, width, cp);
    372 	}
    373 }
    374 
    375 void
    376 p_flags(int f)
    377 {
    378 	char name[33], *flags;
    379 	const struct bits *p = bits;
    380 
    381 	for (flags = name; p->b_mask && flags < &name[sizeof(name) - 2]; p++)
    382 		if (p->b_mask & f)
    383 			*flags++ = p->b_val;
    384 	*flags = '\0';
    385 	printf("%-6.6s ", name);
    386 }
    387 
    388 #ifndef SMALL
    389 void
    390 p_rtrmx(const struct rt_metrics *rmx)
    391 {
    392 	printf("\texpire   %10"PRId64"%c  recvpipe %10"PRIu64"%c  "
    393 	    "sendpipe %10"PRIu64"%c\n",
    394 	    (int64_t)rmx->rmx_expire,
    395 	    (rmx->rmx_locks & RTV_EXPIRE) ? 'L' : ' ', rmx->rmx_recvpipe,
    396 	    (rmx->rmx_locks & RTV_RPIPE) ? 'L' : ' ', rmx->rmx_sendpipe,
    397 	    (rmx->rmx_locks & RTV_SPIPE) ? 'L' : ' ');
    398 	printf("\tssthresh %10"PRIu64"%c  rtt      %10"PRIu64"%c  "
    399 	    "rttvar   %10"PRIu64"%c\n", rmx->rmx_ssthresh,
    400 	    (rmx->rmx_locks & RTV_SSTHRESH) ? 'L' : ' ',
    401 	    rmx->rmx_rtt, (rmx->rmx_locks & RTV_RTT) ? 'L' : ' ',
    402 	    rmx->rmx_rttvar, (rmx->rmx_locks & RTV_RTTVAR) ? 'L' : ' ');
    403 	printf("\thopcount %10"PRIu64"%c\n",
    404 	    rmx->rmx_hopcount, (rmx->rmx_locks & RTV_HOPCOUNT) ? 'L' : ' ');
    405 }
    406 
    407 static void
    408 p_tag(const struct sockaddr *sa)
    409 {
    410 	char *line;
    411 
    412 	if (sa == NULL || sa->sa_family != AF_MPLS) {
    413 		printf("%7s", "-");
    414 		return;
    415 	}
    416 	line = mpls_ntoa(sa);
    417 	if (strlen(line) < 7)
    418 		printf("%7s", line);
    419 	else
    420 		printf("%s", line);
    421 }
    422 #endif
    423 
    424 static char line[MAXHOSTNAMELEN];
    425 static char domain[MAXHOSTNAMELEN];
    426 
    427 char *
    428 routename(const struct sockaddr *sa, int flags)
    429 {
    430 	char *cp = NULL;
    431 	static int first = 1;
    432 
    433 	if (first) {
    434 		first = 0;
    435 		if (gethostname(domain, sizeof(domain)) == 0 &&
    436 		    (cp = strchr(domain, '.')))
    437 			(void)strlcpy(domain, cp + 1, sizeof(domain));
    438 		else
    439 			domain[0] = '\0';
    440 		cp = NULL;
    441 	}
    442 
    443 	if (sa->sa_len == 0) {
    444 		(void)strlcpy(line, "default", sizeof(line));
    445 		return (line);
    446 	}
    447 
    448 	switch (sa->sa_family) {
    449 	case AF_INET:
    450 		return routename4(
    451 		    ((const struct sockaddr_in *)sa)->sin_addr.s_addr,
    452 		    flags);
    453 #ifdef INET6
    454 	case AF_INET6:
    455 	    {
    456 		struct sockaddr_in6 sin6;
    457 
    458 		memset(&sin6, 0, sizeof(sin6));
    459 		memcpy(&sin6, sa, sa->sa_len);
    460 		sin6.sin6_len = sizeof(struct sockaddr_in6);
    461 		sin6.sin6_family = AF_INET6;
    462 		if (sa->sa_len == sizeof(struct sockaddr_in6))
    463 			inet6_getscopeid(&sin6, INET6_IS_ADDR_LINKLOCAL|
    464 			    INET6_IS_ADDR_MC_LINKLOCAL);
    465 		return routename6(&sin6, flags);
    466 	    }
    467 #endif
    468 	case AF_LINK:
    469 		return link_print(sa);
    470 
    471 #ifndef SMALL
    472 	case AF_MPLS:
    473 		return mpls_ntoa(sa);
    474 
    475 	case AF_APPLETALK:
    476 		(void)snprintf(line, sizeof(line), "atalk %d.%d",
    477 		    ((const struct sockaddr_at *)sa)->sat_addr.s_net,
    478 		    ((const struct sockaddr_at *)sa)->sat_addr.s_node);
    479 		break;
    480 #endif
    481 
    482 #if 0 /* XXX-elad */
    483 	case AF_UNSPEC:
    484 		if (sa->sa_len == sizeof(struct sockaddr_rtlabel)) {
    485 			static char name[RTLABEL_LEN];
    486 			struct sockaddr_rtlabel *sr;
    487 
    488 			sr = (struct sockaddr_rtlabel *)sa;
    489 			strlcpy(name, sr->sr_label, sizeof(name));
    490 			return (name);
    491 		}
    492 		/* FALLTHROUGH */
    493 #endif
    494 	default:
    495 		(void)snprintf(line, sizeof(line), "(%d) %s",
    496 		    sa->sa_family, any_ntoa(sa));
    497 		break;
    498 	}
    499 	return (line);
    500 }
    501 
    502 char *
    503 routename4(in_addr_t in, int flags)
    504 {
    505 	const char	*cp = NULL;
    506 	struct in_addr	 ina;
    507 	struct hostent	*hp;
    508 
    509 	if (in == INADDR_ANY)
    510 		cp = "default";
    511 	if (!cp && (flags & RT_NFLAG) == 0) {
    512 		if ((hp = gethostbyaddr((char *)&in,
    513 		    sizeof(in), AF_INET)) != NULL) {
    514 			char *p;
    515 			if ((p = strchr(hp->h_name, '.')) &&
    516 			    !strcmp(p + 1, domain))
    517 				*p = '\0';
    518 			cp = hp->h_name;
    519 		}
    520 	}
    521 	ina.s_addr = in;
    522 	strlcpy(line, cp ? cp : inet_ntoa(ina), sizeof(line));
    523 
    524 	return (line);
    525 }
    526 
    527 #ifdef INET6
    528 char *
    529 routename6(const struct sockaddr_in6 *sin6, int flags)
    530 {
    531 	int	 niflags = 0;
    532 
    533 	if ((flags & RT_NFLAG))
    534 		niflags |= NI_NUMERICHOST;
    535 	else
    536 		niflags |= NI_NOFQDN;
    537 
    538 	if (getnameinfo((const struct sockaddr *)sin6, sin6->sin6_len,
    539 	    line, sizeof(line), NULL, 0, niflags) != 0)
    540 		strncpy(line, "invalid", sizeof(line));
    541 
    542 	return (line);
    543 }
    544 #endif
    545 
    546 /*
    547  * Return the name of the network whose address is given.
    548  * The address is assumed to be that of a net or subnet, not a host.
    549  */
    550 char *
    551 netname4(in_addr_t in, in_addr_t mask, int flags)
    552 {
    553 	const char *cp = NULL;
    554 	struct netent *np = NULL;
    555 	int mbits;
    556 
    557 	in = ntohl(in);
    558 	mask = ntohl(mask);
    559 	if (!(flags & RT_NFLAG) && in != INADDR_ANY) {
    560 		if ((np = getnetbyaddr(in, AF_INET)) != NULL)
    561 			cp = np->n_name;
    562 	}
    563 	mbits = mask ? 33 - ffs(mask) : 0;
    564 	if (in == INADDR_ANY && !mbits)
    565 			cp = "default";
    566 	if (cp)
    567 		strlcpy(line, cp, sizeof(line));
    568 #define C(x)	((x) & 0xff)
    569 	else if (mbits < 9)
    570 		snprintf(line, sizeof(line), "%u/%d", C(in >> 24), mbits);
    571 	else if (mbits < 17)
    572 		snprintf(line, sizeof(line), "%u.%u/%d",
    573 		    C(in >> 24) , C(in >> 16), mbits);
    574 	else if (mbits < 25)
    575 		snprintf(line, sizeof(line), "%u.%u.%u/%d",
    576 		    C(in >> 24), C(in >> 16), C(in >> 8), mbits);
    577 	else
    578 		snprintf(line, sizeof(line), "%u.%u.%u.%u/%d", C(in >> 24),
    579 		    C(in >> 16), C(in >> 8), C(in), mbits);
    580 #undef C
    581 	return (line);
    582 }
    583 
    584 #ifdef INET6
    585 char *
    586 netname6(const struct sockaddr_in6 *sa6, const struct sockaddr_in6 *mask, int flags)
    587 {
    588 	struct sockaddr_in6 sin6;
    589 	const u_char *p;
    590 	int masklen, final = 0, illegal = 0;
    591 	int i, lim, flag, error;
    592 	char hbuf[NI_MAXHOST];
    593 
    594 	sin6 = *sa6;
    595 
    596 	flag = 0;
    597 	masklen = 0;
    598 	if (mask) {
    599 		lim = mask->sin6_len - offsetof(struct sockaddr_in6, sin6_addr);
    600 		if (lim < 0)
    601 			lim = 0;
    602 		else if (lim > (int)sizeof(struct in6_addr))
    603 			lim = sizeof(struct in6_addr);
    604 		for (p = (const u_char *)&mask->sin6_addr, i = 0; i < lim; p++) {
    605 			if (final && *p) {
    606 				illegal++;
    607 				sin6.sin6_addr.s6_addr[i++] = 0x00;
    608 				continue;
    609 			}
    610 
    611 			switch (*p & 0xff) {
    612 			case 0xff:
    613 				masklen += 8;
    614 				break;
    615 			case 0xfe:
    616 				masklen += 7;
    617 				final++;
    618 				break;
    619 			case 0xfc:
    620 				masklen += 6;
    621 				final++;
    622 				break;
    623 			case 0xf8:
    624 				masklen += 5;
    625 				final++;
    626 				break;
    627 			case 0xf0:
    628 				masklen += 4;
    629 				final++;
    630 				break;
    631 			case 0xe0:
    632 				masklen += 3;
    633 				final++;
    634 				break;
    635 			case 0xc0:
    636 				masklen += 2;
    637 				final++;
    638 				break;
    639 			case 0x80:
    640 				masklen += 1;
    641 				final++;
    642 				break;
    643 			case 0x00:
    644 				final++;
    645 				break;
    646 			default:
    647 				final++;
    648 				illegal++;
    649 				break;
    650 			}
    651 
    652 			if (!illegal)
    653 				sin6.sin6_addr.s6_addr[i++] &= *p;
    654 			else
    655 				sin6.sin6_addr.s6_addr[i++] = 0x00;
    656 		}
    657 		while (i < (int)sizeof(struct in6_addr))
    658 			sin6.sin6_addr.s6_addr[i++] = 0x00;
    659 	} else
    660 		masklen = 128;
    661 
    662 	if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr)) {
    663 		snprintf(line, sizeof(line), "default");
    664 		return (line);
    665 	}
    666 
    667 	if (illegal)
    668 		warnx("illegal prefixlen");
    669 
    670 	if (flags & RT_NFLAG)
    671 		flag |= NI_NUMERICHOST;
    672 	error = getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
    673 	    hbuf, sizeof(hbuf), NULL, 0, flag);
    674 	if (error)
    675 		snprintf(hbuf, sizeof(hbuf), "invalid");
    676 
    677 	snprintf(line, sizeof(line), "%s/%d", hbuf, masklen);
    678 	return (line);
    679 }
    680 #endif
    681 
    682 /*
    683  * Return the name of the network whose address is given.
    684  * The address is assumed to be that of a net or subnet, not a host.
    685  */
    686 char *
    687 netname(const struct sockaddr *sa, const struct sockaddr *mask, int flags)
    688 {
    689 	switch (sa->sa_family) {
    690 
    691 	case AF_INET:
    692 		return netname4(((const struct sockaddr_in *)sa)->sin_addr.s_addr,
    693 		    ((const struct sockaddr_in *)mask)->sin_addr.s_addr, flags);
    694 #ifdef INET6
    695 	case AF_INET6:
    696 		return netname6((const struct sockaddr_in6 *)sa,
    697 		    (const struct sockaddr_in6 *)mask, flags);
    698 #endif
    699 	case AF_LINK:
    700 		return link_print(sa);
    701 	default:
    702 		snprintf(line, sizeof(line), "af %d: %s",
    703 		    sa->sa_family, any_ntoa(sa));
    704 		break;
    705 	}
    706 	return (line);
    707 }
    708 
    709 static const char hexlist[] = "0123456789abcdef";
    710 
    711 char *
    712 any_ntoa(const struct sockaddr *sa)
    713 {
    714 	static char obuf[240];
    715 	const char *in = sa->sa_data;
    716 	char *out = obuf;
    717 	int len = sa->sa_len - offsetof(struct sockaddr, sa_data);
    718 
    719 	*out++ = 'Q';
    720 	do {
    721 		*out++ = hexlist[(*in >> 4) & 15];
    722 		*out++ = hexlist[(*in++)    & 15];
    723 		*out++ = '.';
    724 	} while (--len > 0 && (out + 3) < &obuf[sizeof(obuf) - 1]);
    725 	out[-1] = '\0';
    726 	return (obuf);
    727 }
    728 
    729 static char *
    730 link_print(const struct sockaddr *sa)
    731 {
    732 	const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)sa;
    733 	const u_char *lla = (const u_char *)sdl->sdl_data + sdl->sdl_nlen;
    734 
    735 	if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
    736 	    sdl->sdl_slen == 0) {
    737 		(void)snprintf(line, sizeof(line), "link#%d", sdl->sdl_index);
    738 		return (line);
    739 	}
    740 	switch (sdl->sdl_type) {
    741 	case IFT_ETHER:
    742 	case IFT_CARP:
    743 		return ether_ntoa((const struct ether_addr *)lla);
    744 	default:
    745 		return link_ntoa(sdl);
    746 	}
    747 }
    748 
    749 #ifndef SMALL
    750 char *
    751 mpls_ntoa(const struct sockaddr *sa)
    752 {
    753 	static char obuf[16];
    754 	size_t olen;
    755 	const union mpls_shim *pms;
    756 	union mpls_shim ms;
    757 	int psize = sizeof(struct sockaddr_mpls);
    758 
    759 	pms = &((const struct sockaddr_mpls*)sa)->smpls_addr;
    760 	ms.s_addr = ntohl(pms->s_addr);
    761 
    762 	snprintf(obuf, sizeof(obuf), "%u", ms.shim.label);
    763 
    764 	while(psize < sa->sa_len) {
    765 		pms++;
    766 		ms.s_addr = ntohl(pms->s_addr);
    767 		olen = strlen(obuf);
    768 		snprintf(obuf + olen, sizeof(obuf) - olen, ",%u",
    769 		    ms.shim.label);
    770 		psize+=sizeof(ms);
    771 	}
    772 	return obuf;
    773 }
    774 #endif
    775 
    776 void
    777 p_addr(const struct sockaddr *sa, const struct sockaddr *mask, int rflags, int flags)
    778 {
    779 	p_sockaddr(sa, mask, rflags, WID_DST(sa->sa_family), flags);
    780 }
    781 
    782 void
    783 p_gwaddr(const struct sockaddr *sa, int gwaf, int flags)
    784 {
    785 	p_sockaddr(sa, 0, RTF_HOST, WID_GW(gwaf), flags);
    786 }
    787