route.c revision 290388 
1/*-
2 * Copyright (c) 1983, 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if 0
31#ifndef lint
32static char sccsid[] = "From: @(#)route.c	8.6 (Berkeley) 4/28/95";
33#endif /* not lint */
34#endif
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: head/usr.bin/netstat/route.c 290388 2015-11-05 10:58:19Z ume $");
38
39#include <sys/param.h>
40#include <sys/protosw.h>
41#include <sys/socket.h>
42#include <sys/socketvar.h>
43#include <sys/sysctl.h>
44#include <sys/time.h>
45
46#include <net/ethernet.h>
47#include <net/if.h>
48#include <net/if_dl.h>
49#include <net/if_types.h>
50#include <net/route.h>
51
52#include <netinet/in.h>
53#include <netgraph/ng_socket.h>
54
55#include <arpa/inet.h>
56#include <ifaddrs.h>
57#include <libutil.h>
58#include <netdb.h>
59#include <stdint.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <stdbool.h>
63#include <string.h>
64#include <sysexits.h>
65#include <unistd.h>
66#include <err.h>
67#include <libxo/xo.h>
68#include "netstat.h"
69#include "nl_defs.h"
70
71/*
72 * Definitions for showing gateway flags.
73 */
74static struct bits {
75	u_long	b_mask;
76	char	b_val;
77	const char *b_name;
78} bits[] = {
79	{ RTF_UP,	'U', "up" },
80	{ RTF_GATEWAY,	'G', "gateway" },
81	{ RTF_HOST,	'H', "host" },
82	{ RTF_REJECT,	'R', "reject" },
83	{ RTF_DYNAMIC,	'D', "dynamic" },
84	{ RTF_MODIFIED,	'M', "modified" },
85	{ RTF_DONE,	'd', "done" }, /* Completed -- for routing msgs only */
86	{ RTF_XRESOLVE,	'X', "xresolve" },
87	{ RTF_STATIC,	'S', "static" },
88	{ RTF_PROTO1,	'1', "proto1" },
89	{ RTF_PROTO2,	'2', "proto2" },
90	{ RTF_PROTO3,	'3', "proto3" },
91	{ RTF_BLACKHOLE,'B', "blackhole" },
92	{ RTF_BROADCAST,'b', "broadcast" },
93#ifdef RTF_LLINFO
94	{ RTF_LLINFO,	'L', "llinfo" },
95#endif
96	{ 0 , 0, NULL }
97};
98
99struct ifmap_entry {
100	char ifname[IFNAMSIZ];
101};
102static struct ifmap_entry *ifmap;
103static int ifmap_size;
104static struct timespec uptime;
105
106static const char *netname4(in_addr_t, in_addr_t);
107static const char *netname6(struct sockaddr_in6 *, struct sockaddr_in6 *);
108static void p_rtable_sysctl(int, int);
109static void p_rtentry_sysctl(const char *name, struct rt_msghdr *);
110static void p_sockaddr(const char *name, struct sockaddr *, struct sockaddr *,
111    int, int);
112static const char *fmt_sockaddr(struct sockaddr *sa, struct sockaddr *mask,
113    int flags);
114static void p_flags(int, const char *);
115static const char *fmt_flags(int f);
116static void domask(char *, in_addr_t, u_long);
117
118
119/*
120 * Print routing tables.
121 */
122void
123routepr(int fibnum, int af)
124{
125	size_t intsize;
126	int numfibs;
127
128	if (live == 0)
129		return;
130
131	intsize = sizeof(int);
132	if (fibnum == -1 &&
133	    sysctlbyname("net.my_fibnum", &fibnum, &intsize, NULL, 0) == -1)
134		fibnum = 0;
135	if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1)
136		numfibs = 1;
137	if (fibnum < 0 || fibnum > numfibs - 1)
138		errx(EX_USAGE, "%d: invalid fib", fibnum);
139	/*
140	 * Since kernel & userland use different timebase
141	 * (time_uptime vs time_second) and we are reading kernel memory
142	 * directly we should do rt_expire --> expire_time conversion.
143	 */
144	if (clock_gettime(CLOCK_UPTIME, &uptime) < 0)
145		err(EX_OSERR, "clock_gettime() failed");
146
147	xo_open_container("route-information");
148	xo_emit("{T:Routing tables}");
149	if (fibnum)
150		xo_emit(" ({L:fib}: {:fib/%d})", fibnum);
151	xo_emit("\n");
152	p_rtable_sysctl(fibnum, af);
153	xo_close_container("route-information");
154}
155
156
157/*
158 * Print address family header before a section of the routing table.
159 */
160void
161pr_family(int af1)
162{
163	const char *afname;
164
165	switch (af1) {
166	case AF_INET:
167		afname = "Internet";
168		break;
169#ifdef INET6
170	case AF_INET6:
171		afname = "Internet6";
172		break;
173#endif /*INET6*/
174	case AF_ISO:
175		afname = "ISO";
176		break;
177	case AF_CCITT:
178		afname = "X.25";
179		break;
180	case AF_NETGRAPH:
181		afname = "Netgraph";
182		break;
183	default:
184		afname = NULL;
185		break;
186	}
187	if (afname)
188		xo_emit("\n{k:address-family/%s}:\n", afname);
189	else
190		xo_emit("\n{L:Protocol Family} {k:address-family/%d}:\n", af1);
191}
192
193/* column widths; each followed by one space */
194#ifndef INET6
195#define	WID_DST_DEFAULT(af) 	18	/* width of destination column */
196#define	WID_GW_DEFAULT(af)	18	/* width of gateway column */
197#define	WID_IF_DEFAULT(af)	(Wflag ? 10 : 8) /* width of netif column */
198#else
199#define	WID_DST_DEFAULT(af) \
200	((af) == AF_INET6 ? (numeric_addr ? 33: 18) : 18)
201#define	WID_GW_DEFAULT(af) \
202	((af) == AF_INET6 ? (numeric_addr ? 29 : 18) : 18)
203#define	WID_IF_DEFAULT(af)	((af) == AF_INET6 ? 8 : (Wflag ? 10 : 8))
204#endif /*INET6*/
205
206static int wid_dst;
207static int wid_gw;
208static int wid_flags;
209static int wid_pksent;
210static int wid_mtu;
211static int wid_if;
212static int wid_expire;
213
214/*
215 * Print header for routing table columns.
216 */
217static void
218pr_rthdr(int af1 __unused)
219{
220
221	if (Wflag) {
222		xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} "
223		    "{T:/%*.*s} {T:/%*.*s} {T:/%*s}\n",
224			wid_dst,	wid_dst,	"Destination",
225			wid_gw,		wid_gw,		"Gateway",
226			wid_flags,	wid_flags,	"Flags",
227			wid_pksent,	wid_pksent,	"Use",
228			wid_mtu,	wid_mtu,	"Mtu",
229			wid_if,		wid_if,		"Netif",
230			wid_expire,			"Expire");
231	} else {
232		xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} "
233		    "{T:/%*s}\n",
234			wid_dst,	wid_dst,	"Destination",
235			wid_gw,		wid_gw,		"Gateway",
236			wid_flags,	wid_flags,	"Flags",
237			wid_if,		wid_if,		"Netif",
238			wid_expire,			"Expire");
239	}
240}
241
242static void
243p_rtable_sysctl(int fibnum, int af)
244{
245	size_t needed;
246	int mib[7];
247	char *buf, *next, *lim;
248	struct rt_msghdr *rtm;
249	struct sockaddr *sa;
250	int fam = AF_UNSPEC, ifindex = 0, size;
251	int need_table_close = false;
252
253	struct ifaddrs *ifap, *ifa;
254	struct sockaddr_dl *sdl;
255
256	/*
257	 * Retrieve interface list at first
258	 * since we need #ifindex -> if_xname match
259	 */
260	if (getifaddrs(&ifap) != 0)
261		err(EX_OSERR, "getifaddrs");
262
263	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
264
265		if (ifa->ifa_addr->sa_family != AF_LINK)
266			continue;
267
268		sdl = (struct sockaddr_dl *)ifa->ifa_addr;
269		ifindex = sdl->sdl_index;
270
271		if (ifindex >= ifmap_size) {
272			size = roundup(ifindex + 1, 32) *
273			    sizeof(struct ifmap_entry);
274			if ((ifmap = realloc(ifmap, size)) == NULL)
275				errx(2, "realloc(%d) failed", size);
276			memset(&ifmap[ifmap_size], 0,
277			    size - ifmap_size *
278			    sizeof(struct ifmap_entry));
279
280			ifmap_size = roundup(ifindex + 1, 32);
281		}
282
283		if (*ifmap[ifindex].ifname != '\0')
284			continue;
285
286		strlcpy(ifmap[ifindex].ifname, ifa->ifa_name, IFNAMSIZ);
287	}
288
289	freeifaddrs(ifap);
290
291	mib[0] = CTL_NET;
292	mib[1] = PF_ROUTE;
293	mib[2] = 0;
294	mib[3] = af;
295	mib[4] = NET_RT_DUMP;
296	mib[5] = 0;
297	mib[6] = fibnum;
298	if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
299		err(EX_OSERR, "sysctl: net.route.0.%d.dump.%d estimate", af,
300		    fibnum);
301	if ((buf = malloc(needed)) == NULL)
302		errx(2, "malloc(%lu)", (unsigned long)needed);
303	if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0)
304		err(1, "sysctl: net.route.0.%d.dump.%d", af, fibnum);
305	lim  = buf + needed;
306	xo_open_container("route-table");
307	xo_open_list("rt-family");
308	for (next = buf; next < lim; next += rtm->rtm_msglen) {
309		rtm = (struct rt_msghdr *)next;
310		if (rtm->rtm_version != RTM_VERSION)
311			continue;
312		/*
313		 * Peek inside header to determine AF
314		 */
315		sa = (struct sockaddr *)(rtm + 1);
316		/* Only print family first time. */
317		if (fam != sa->sa_family) {
318			if (need_table_close) {
319				xo_close_list("rt-entry");
320				xo_close_instance("rt-family");
321			}
322			need_table_close = true;
323
324			fam = sa->sa_family;
325			wid_dst = WID_DST_DEFAULT(fam);
326			wid_gw = WID_GW_DEFAULT(fam);
327			wid_flags = 6;
328			wid_pksent = 8;
329			wid_mtu = 6;
330			wid_if = WID_IF_DEFAULT(fam);
331			wid_expire = 6;
332			xo_open_instance("rt-family");
333			pr_family(fam);
334			xo_open_list("rt-entry");
335
336			pr_rthdr(fam);
337		}
338		p_rtentry_sysctl("rt-entry", rtm);
339	}
340	if (need_table_close) {
341		xo_close_list("rt-entry");
342		xo_close_instance("rt-family");
343	}
344	xo_close_list("rt-family");
345	xo_close_container("route-table");
346	free(buf);
347}
348
349static void
350p_rtentry_sysctl(const char *name, struct rt_msghdr *rtm)
351{
352	struct sockaddr *sa, *addr[RTAX_MAX];
353	char buffer[128];
354	char prettyname[128];
355	int i;
356
357	xo_open_instance(name);
358	sa = (struct sockaddr *)(rtm + 1);
359	for (i = 0; i < RTAX_MAX; i++) {
360		if (rtm->rtm_addrs & (1 << i))
361			addr[i] = sa;
362		sa = (struct sockaddr *)((char *)sa + SA_SIZE(sa));
363	}
364
365	p_sockaddr("destination", addr[RTAX_DST], addr[RTAX_NETMASK],
366	    rtm->rtm_flags, wid_dst);
367	p_sockaddr("gateway", addr[RTAX_GATEWAY], NULL, RTF_HOST, wid_gw);
368	snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ",
369	    wid_flags);
370	p_flags(rtm->rtm_flags, buffer);
371	if (Wflag) {
372		xo_emit("{t:use/%*lu} ", wid_pksent, rtm->rtm_rmx.rmx_pksent);
373
374		if (rtm->rtm_rmx.rmx_mtu != 0)
375			xo_emit("{t:mtu/%*lu} ", wid_mtu, rtm->rtm_rmx.rmx_mtu);
376		else
377			xo_emit("{P:/%*s} ", wid_mtu, "");
378	}
379
380	memset(prettyname, 0, sizeof(prettyname));
381	if (rtm->rtm_index < ifmap_size) {
382		strlcpy(prettyname, ifmap[rtm->rtm_index].ifname,
383		    sizeof(prettyname));
384		if (*prettyname == '\0')
385			strlcpy(prettyname, "---", sizeof(prettyname));
386	}
387
388	xo_emit("{t:interface-name/%*.*s}", wid_if, wid_if, prettyname);
389	if (rtm->rtm_rmx.rmx_expire) {
390		time_t expire_time;
391
392		if ((expire_time = rtm->rtm_rmx.rmx_expire - uptime.tv_sec) > 0)
393			xo_emit(" {:expire-time/%*d}", wid_expire,
394			    (int)expire_time);
395	}
396
397	xo_emit("\n");
398	xo_close_instance(name);
399}
400
401static void
402p_sockaddr(const char *name, struct sockaddr *sa, struct sockaddr *mask,
403    int flags, int width)
404{
405	const char *cp;
406	char buf[128];
407
408	cp = fmt_sockaddr(sa, mask, flags);
409
410	if (width < 0) {
411		snprintf(buf, sizeof(buf), "{:%s/%%s} ", name);
412		xo_emit(buf, cp);
413	} else {
414		if (Wflag != 0 || numeric_addr) {
415			snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%s}{]:} ",
416			    -width, name);
417			xo_emit(buf, cp);
418		} else {
419			snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%-.*s}{]:} ",
420			    -width, name);
421			xo_emit(buf, width, cp);
422		}
423	}
424}
425
426static const char *
427fmt_sockaddr(struct sockaddr *sa, struct sockaddr *mask, int flags)
428{
429	static char buf[128];
430	const char *cp;
431
432	if (sa == NULL)
433		return ("null");
434
435	switch(sa->sa_family) {
436#ifdef INET6
437	case AF_INET6:
438		/*
439		 * The sa6->sin6_scope_id must be filled here because
440		 * this sockaddr is extracted from kmem(4) directly
441		 * and has KAME-specific embedded scope id in
442		 * sa6->sin6_addr.s6_addr[2].
443		 */
444		in6_fillscopeid(satosin6(sa));
445		/* FALLTHROUGH */
446#endif /*INET6*/
447	case AF_INET:
448		if (flags & RTF_HOST)
449			cp = routename(sa, numeric_addr);
450		else if (mask)
451			cp = netname(sa, mask);
452		else
453			cp = netname(sa, NULL);
454		break;
455	case AF_NETGRAPH:
456	    {
457		strlcpy(buf, ((struct sockaddr_ng *)sa)->sg_data,
458		    sizeof(buf));
459		cp = buf;
460		break;
461	    }
462	case AF_LINK:
463	    {
464#if 0
465		struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
466
467		/* Interface route. */
468		if (sdl->sdl_nlen)
469			cp = sdl->sdl_data;
470		else
471#endif
472			cp = routename(sa, 1);
473		break;
474	    }
475	default:
476	    {
477		u_char *s = (u_char *)sa->sa_data, *slim;
478		char *cq, *cqlim;
479
480		cq = buf;
481		slim =  sa->sa_len + (u_char *) sa;
482		cqlim = cq + sizeof(buf) - 6;
483		cq += sprintf(cq, "(%d)", sa->sa_family);
484		while (s < slim && cq < cqlim) {
485			cq += sprintf(cq, " %02x", *s++);
486			if (s < slim)
487			    cq += sprintf(cq, "%02x", *s++);
488		}
489		cp = buf;
490	    }
491	}
492
493	return (cp);
494}
495
496static void
497p_flags(int f, const char *format)
498{
499	struct bits *p;
500
501	xo_emit(format, fmt_flags(f));
502
503	xo_open_list("flags_pretty");
504	for (p = bits; p->b_mask; p++)
505		if (p->b_mask & f)
506			xo_emit("{le:flags_pretty/%s}", p->b_name);
507	xo_close_list("flags_pretty");
508}
509
510static const char *
511fmt_flags(int f)
512{
513	static char name[33];
514	char *flags;
515	struct bits *p = bits;
516
517	for (flags = name; p->b_mask; p++)
518		if (p->b_mask & f)
519			*flags++ = p->b_val;
520	*flags = '\0';
521	return (name);
522}
523
524char *
525routename(struct sockaddr *sa, int flags)
526{
527	static char line[NI_MAXHOST];
528	int error, f;
529
530	f = (flags) ? NI_NUMERICHOST : 0;
531	error = getnameinfo(sa, sa->sa_len, line, sizeof(line),
532	    NULL, 0, f);
533	if (error) {
534		const void *src;
535		switch (sa->sa_family) {
536#ifdef INET
537		case AF_INET:
538			src = &satosin(sa)->sin_addr;
539			break;
540#endif /* INET */
541#ifdef INET6
542		case AF_INET6:
543			src = &satosin6(sa)->sin6_addr;
544			break;
545#endif /* INET6 */
546		default:
547			return(line);
548		}
549		inet_ntop(sa->sa_family, src, line, sizeof(line) - 1);
550		return (line);
551	}
552	trimdomain(line, strlen(line));
553
554	return (line);
555}
556
557#define	NSHIFT(m) (							\
558	(m) == IN_CLASSA_NET ? IN_CLASSA_NSHIFT :			\
559	(m) == IN_CLASSB_NET ? IN_CLASSB_NSHIFT :			\
560	(m) == IN_CLASSC_NET ? IN_CLASSC_NSHIFT :			\
561	0)
562
563static void
564domask(char *dst, in_addr_t addr __unused, u_long mask)
565{
566	int b, i;
567
568	if (mask == 0) {
569		*dst = '\0';
570		return;
571	}
572	i = 0;
573	for (b = 0; b < 32; b++)
574		if (mask & (1 << b)) {
575			int bb;
576
577			i = b;
578			for (bb = b+1; bb < 32; bb++)
579				if (!(mask & (1 << bb))) {
580					i = -1;	/* noncontig */
581					break;
582				}
583			break;
584		}
585	if (i == -1)
586		sprintf(dst, "&0x%lx", mask);
587	else
588		sprintf(dst, "/%d", 32-i);
589}
590
591/*
592 * Return the name of the network whose address is given.
593 */
594const char *
595netname(struct sockaddr *sa, struct sockaddr *mask)
596{
597	switch (sa->sa_family) {
598	case AF_INET:
599		if (mask != NULL)
600			return (netname4(satosin(sa)->sin_addr.s_addr,
601			    satosin(mask)->sin_addr.s_addr));
602		else
603			return (netname4(satosin(sa)->sin_addr.s_addr,
604			    INADDR_ANY));
605		break;
606#ifdef INET6
607	case AF_INET6:
608		return (netname6(satosin6(sa), satosin6(mask)));
609#endif /* INET6 */
610	default:
611		return (NULL);
612	}
613}
614
615static const char *
616netname4(in_addr_t in, in_addr_t mask)
617{
618	char *cp = 0;
619	static char line[MAXHOSTNAMELEN + sizeof("/xx")];
620	char nline[INET_ADDRSTRLEN];
621	struct netent *np = 0;
622	in_addr_t i;
623
624	if (in == INADDR_ANY && mask == 0) {
625		strlcpy(line, "default", sizeof(line));
626		return (line);
627	}
628
629	/* It is ok to supply host address. */
630	in &= mask;
631
632	i = ntohl(in);
633	if (!numeric_addr && i) {
634		np = getnetbyaddr(i >> NSHIFT(ntohl(mask)), AF_INET);
635		if (np != NULL) {
636			cp = np->n_name;
637			trimdomain(cp, strlen(cp));
638		}
639	}
640	inet_ntop(AF_INET, &in, nline, sizeof(line));
641	if (cp != NULL) {
642		if (strcpy(cp, nline) != 0)
643			return (line);
644		strlcpy(line, cp, sizeof(line));
645	} else
646		strlcpy(line, nline, sizeof(line));
647	domask(line + strlen(line), i, ntohl(mask));
648
649	return (line);
650}
651
652#undef NSHIFT
653
654#ifdef INET6
655void
656in6_fillscopeid(struct sockaddr_in6 *sa6)
657{
658#if defined(__KAME__)
659	/*
660	 * XXX: This is a special workaround for KAME kernels.
661	 * sin6_scope_id field of SA should be set in the future.
662	 */
663	if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr) ||
664	    IN6_IS_ADDR_MC_NODELOCAL(&sa6->sin6_addr) ||
665	    IN6_IS_ADDR_MC_LINKLOCAL(&sa6->sin6_addr)) {
666		if (sa6->sin6_scope_id == 0)
667			sa6->sin6_scope_id =
668			    ntohs(*(u_int16_t *)&sa6->sin6_addr.s6_addr[2]);
669		sa6->sin6_addr.s6_addr[2] = sa6->sin6_addr.s6_addr[3] = 0;
670	}
671#endif
672}
673
674/* Mask to length table.  To check an invalid value, (length + 1) is used. */
675static int masktolen[256] = {
676	[0xff] = 8 + 1,
677	[0xfe] = 7 + 1,
678	[0xfc] = 6 + 1,
679	[0xf8] = 5 + 1,
680	[0xf0] = 4 + 1,
681	[0xe0] = 3 + 1,
682	[0xc0] = 2 + 1,
683	[0x80] = 1 + 1,
684	[0x00] = 0 + 1,
685};
686
687static const char *
688netname6(struct sockaddr_in6 *sa6, struct sockaddr_in6 *mask)
689{
690	static char line[NI_MAXHOST + sizeof("/xxx") - 1];
691	struct sockaddr_in6 addr;
692	char nline[NI_MAXHOST];
693	u_char *p, *lim;
694	int masklen, illegal = 0, i;
695
696	if (mask) {
697		p = (u_char *)&mask->sin6_addr;
698		for (masklen = 0, lim = p + 16; p < lim; p++) {
699			if (masktolen[*p] > 0)
700				/* -1 is required. */
701				masklen += masktolen[*p] - 1;
702			else
703				illegal++;
704		}
705		if (illegal)
706			xo_error("illegal prefixlen\n");
707
708		memcpy(&addr, sa6, sizeof(addr));
709		for (i = 0; i < 16; ++i)
710			addr.sin6_addr.s6_addr[i] &=
711			    mask->sin6_addr.s6_addr[i];
712		sa6 = &addr;
713	}
714	else
715		masklen = 128;
716
717	if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr))
718		return("default");
719
720	getnameinfo((struct sockaddr *)sa6, sa6->sin6_len, nline, sizeof(nline),
721	    NULL, 0, NI_NUMERICHOST);
722	if (numeric_addr)
723		strlcpy(line, nline, sizeof(line));
724	else
725		getnameinfo((struct sockaddr *)sa6, sa6->sin6_len, line,
726		    sizeof(line), NULL, 0, 0);
727	if (numeric_addr || strcmp(line, nline) == 0)
728		sprintf(&line[strlen(line)], "/%d", masklen);
729
730	return (line);
731}
732#endif /*INET6*/
733
734/*
735 * Print routing statistics
736 */
737void
738rt_stats(void)
739{
740	struct rtstat rtstat;
741	u_long rtsaddr, rttaddr;
742	int rttrash;
743
744	if ((rtsaddr = nl[N_RTSTAT].n_value) == 0) {
745		xo_emit("{W:rtstat: symbol not in namelist}\n");
746		return;
747	}
748	if ((rttaddr = nl[N_RTTRASH].n_value) == 0) {
749		xo_emit("{W:rttrash: symbol not in namelist}\n");
750		return;
751	}
752	kread(rtsaddr, (char *)&rtstat, sizeof (rtstat));
753	kread(rttaddr, (char *)&rttrash, sizeof (rttrash));
754	xo_emit("{T:routing}:\n");
755
756#define	p(f, m) if (rtstat.f || sflag <= 1) \
757	xo_emit(m, rtstat.f, plural(rtstat.f))
758
759	p(rts_badredirect, "\t{:bad-redirects/%hu} "
760	    "{N:/bad routing redirect%s}\n");
761	p(rts_dynamic, "\t{:dynamically-created/%hu} "
762	    "{N:/dynamically created route%s}\n");
763	p(rts_newgateway, "\t{:new-gateways/%hu} "
764	    "{N:/new gateway%s due to redirects}\n");
765	p(rts_unreach, "\t{:unreachable-destination/%hu} "
766	    "{N:/destination%s found unreachable}\n");
767	p(rts_wildcard, "\t{:wildcard-uses/%hu} "
768	    "{N:/use%s of a wildcard route}\n");
769#undef p
770
771	if (rttrash || sflag <= 1)
772		xo_emit("\t{:unused-but-not-freed/%u} "
773		    "{N:/route%s not in table but not freed}\n",
774		    rttrash, plural(rttrash));
775}
776