route.c revision 302408 
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: stable/11/usr.bin/netstat/route.c 297321 2016-03-27 20:02:21Z pfg $");
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 int 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, protrusion;
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	protrusion = p_sockaddr("destination", addr[RTAX_DST],
366	    addr[RTAX_NETMASK],
367	    rtm->rtm_flags, wid_dst);
368	protrusion = p_sockaddr("gateway", addr[RTAX_GATEWAY], NULL, RTF_HOST,
369	    wid_gw - protrusion);
370	snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ",
371	    wid_flags - protrusion);
372	p_flags(rtm->rtm_flags, buffer);
373	if (Wflag) {
374		xo_emit("{t:use/%*lu} ", wid_pksent, rtm->rtm_rmx.rmx_pksent);
375
376		if (rtm->rtm_rmx.rmx_mtu != 0)
377			xo_emit("{t:mtu/%*lu} ", wid_mtu, rtm->rtm_rmx.rmx_mtu);
378		else
379			xo_emit("{P:/%*s} ", wid_mtu, "");
380	}
381
382	memset(prettyname, 0, sizeof(prettyname));
383	if (rtm->rtm_index < ifmap_size) {
384		strlcpy(prettyname, ifmap[rtm->rtm_index].ifname,
385		    sizeof(prettyname));
386		if (*prettyname == '\0')
387			strlcpy(prettyname, "---", sizeof(prettyname));
388	}
389
390	if (Wflag)
391		xo_emit("{t:interface-name/%*s}", wid_if, prettyname);
392	else
393		xo_emit("{t:interface-name/%*.*s}", wid_if, wid_if,
394		    prettyname);
395	if (rtm->rtm_rmx.rmx_expire) {
396		time_t expire_time;
397
398		if ((expire_time = rtm->rtm_rmx.rmx_expire - uptime.tv_sec) > 0)
399			xo_emit(" {:expire-time/%*d}", wid_expire,
400			    (int)expire_time);
401	}
402
403	xo_emit("\n");
404	xo_close_instance(name);
405}
406
407static int
408p_sockaddr(const char *name, struct sockaddr *sa, struct sockaddr *mask,
409    int flags, int width)
410{
411	const char *cp;
412	char buf[128];
413	int protrusion;
414
415	cp = fmt_sockaddr(sa, mask, flags);
416
417	if (width < 0) {
418		snprintf(buf, sizeof(buf), "{:%s/%%s} ", name);
419		xo_emit(buf, cp);
420		protrusion = 0;
421	} else {
422		if (Wflag != 0 || numeric_addr) {
423			snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%s}{]:} ",
424			    -width, name);
425			xo_emit(buf, cp);
426			protrusion = strlen(cp) - width;
427			if (protrusion < 0)
428				protrusion = 0;
429		} else {
430			snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%-.*s}{]:} ",
431			    -width, name);
432			xo_emit(buf, width, cp);
433			protrusion = 0;
434		}
435	}
436	return (protrusion);
437}
438
439static const char *
440fmt_sockaddr(struct sockaddr *sa, struct sockaddr *mask, int flags)
441{
442	static char buf[128];
443	const char *cp;
444
445	if (sa == NULL)
446		return ("null");
447
448	switch(sa->sa_family) {
449#ifdef INET6
450	case AF_INET6:
451		/*
452		 * The sa6->sin6_scope_id must be filled here because
453		 * this sockaddr is extracted from kmem(4) directly
454		 * and has KAME-specific embedded scope id in
455		 * sa6->sin6_addr.s6_addr[2].
456		 */
457		in6_fillscopeid(satosin6(sa));
458		/* FALLTHROUGH */
459#endif /*INET6*/
460	case AF_INET:
461		if (flags & RTF_HOST)
462			cp = routename(sa, numeric_addr);
463		else if (mask)
464			cp = netname(sa, mask);
465		else
466			cp = netname(sa, NULL);
467		break;
468	case AF_NETGRAPH:
469	    {
470		strlcpy(buf, ((struct sockaddr_ng *)sa)->sg_data,
471		    sizeof(buf));
472		cp = buf;
473		break;
474	    }
475	case AF_LINK:
476	    {
477#if 0
478		struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
479
480		/* Interface route. */
481		if (sdl->sdl_nlen)
482			cp = sdl->sdl_data;
483		else
484#endif
485			cp = routename(sa, 1);
486		break;
487	    }
488	default:
489	    {
490		u_char *s = (u_char *)sa->sa_data, *slim;
491		char *cq, *cqlim;
492
493		cq = buf;
494		slim =  sa->sa_len + (u_char *) sa;
495		cqlim = cq + sizeof(buf) - 6;
496		cq += sprintf(cq, "(%d)", sa->sa_family);
497		while (s < slim && cq < cqlim) {
498			cq += sprintf(cq, " %02x", *s++);
499			if (s < slim)
500			    cq += sprintf(cq, "%02x", *s++);
501		}
502		cp = buf;
503	    }
504	}
505
506	return (cp);
507}
508
509static void
510p_flags(int f, const char *format)
511{
512	struct bits *p;
513
514	xo_emit(format, fmt_flags(f));
515
516	xo_open_list("flags_pretty");
517	for (p = bits; p->b_mask; p++)
518		if (p->b_mask & f)
519			xo_emit("{le:flags_pretty/%s}", p->b_name);
520	xo_close_list("flags_pretty");
521}
522
523static const char *
524fmt_flags(int f)
525{
526	static char name[33];
527	char *flags;
528	struct bits *p = bits;
529
530	for (flags = name; p->b_mask; p++)
531		if (p->b_mask & f)
532			*flags++ = p->b_val;
533	*flags = '\0';
534	return (name);
535}
536
537char *
538routename(struct sockaddr *sa, int flags)
539{
540	static char line[NI_MAXHOST];
541	int error, f;
542
543	f = (flags) ? NI_NUMERICHOST : 0;
544	error = getnameinfo(sa, sa->sa_len, line, sizeof(line),
545	    NULL, 0, f);
546	if (error) {
547		const void *src;
548		switch (sa->sa_family) {
549#ifdef INET
550		case AF_INET:
551			src = &satosin(sa)->sin_addr;
552			break;
553#endif /* INET */
554#ifdef INET6
555		case AF_INET6:
556			src = &satosin6(sa)->sin6_addr;
557			break;
558#endif /* INET6 */
559		default:
560			return(line);
561		}
562		inet_ntop(sa->sa_family, src, line, sizeof(line) - 1);
563		return (line);
564	}
565	trimdomain(line, strlen(line));
566
567	return (line);
568}
569
570#define	NSHIFT(m) (							\
571	(m) == IN_CLASSA_NET ? IN_CLASSA_NSHIFT :			\
572	(m) == IN_CLASSB_NET ? IN_CLASSB_NSHIFT :			\
573	(m) == IN_CLASSC_NET ? IN_CLASSC_NSHIFT :			\
574	0)
575
576static void
577domask(char *dst, in_addr_t addr __unused, u_long mask)
578{
579	int b, i;
580
581	if (mask == 0) {
582		*dst = '\0';
583		return;
584	}
585	i = 0;
586	for (b = 0; b < 32; b++)
587		if (mask & (1 << b)) {
588			int bb;
589
590			i = b;
591			for (bb = b+1; bb < 32; bb++)
592				if (!(mask & (1 << bb))) {
593					i = -1;	/* noncontig */
594					break;
595				}
596			break;
597		}
598	if (i == -1)
599		sprintf(dst, "&0x%lx", mask);
600	else
601		sprintf(dst, "/%d", 32-i);
602}
603
604/*
605 * Return the name of the network whose address is given.
606 */
607const char *
608netname(struct sockaddr *sa, struct sockaddr *mask)
609{
610	switch (sa->sa_family) {
611	case AF_INET:
612		if (mask != NULL)
613			return (netname4(satosin(sa)->sin_addr.s_addr,
614			    satosin(mask)->sin_addr.s_addr));
615		else
616			return (netname4(satosin(sa)->sin_addr.s_addr,
617			    INADDR_ANY));
618		break;
619#ifdef INET6
620	case AF_INET6:
621		return (netname6(satosin6(sa), satosin6(mask)));
622#endif /* INET6 */
623	default:
624		return (NULL);
625	}
626}
627
628static const char *
629netname4(in_addr_t in, in_addr_t mask)
630{
631	char *cp = 0;
632	static char line[MAXHOSTNAMELEN + sizeof("/xx")];
633	char nline[INET_ADDRSTRLEN];
634	struct netent *np = 0;
635	in_addr_t i;
636
637	if (in == INADDR_ANY && mask == 0) {
638		strlcpy(line, "default", sizeof(line));
639		return (line);
640	}
641
642	/* It is ok to supply host address. */
643	in &= mask;
644
645	i = ntohl(in);
646	if (!numeric_addr && i) {
647		np = getnetbyaddr(i >> NSHIFT(ntohl(mask)), AF_INET);
648		if (np != NULL) {
649			cp = np->n_name;
650			trimdomain(cp, strlen(cp));
651		}
652	}
653	if (cp != NULL)
654		strlcpy(line, cp, sizeof(line));
655	else {
656		inet_ntop(AF_INET, &in, nline, sizeof(nline));
657		strlcpy(line, nline, sizeof(line));
658		domask(line + strlen(line), i, ntohl(mask));
659	}
660
661	return (line);
662}
663
664#undef NSHIFT
665
666#ifdef INET6
667void
668in6_fillscopeid(struct sockaddr_in6 *sa6)
669{
670#if defined(__KAME__)
671	/*
672	 * XXX: This is a special workaround for KAME kernels.
673	 * sin6_scope_id field of SA should be set in the future.
674	 */
675	if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr) ||
676	    IN6_IS_ADDR_MC_NODELOCAL(&sa6->sin6_addr) ||
677	    IN6_IS_ADDR_MC_LINKLOCAL(&sa6->sin6_addr)) {
678		if (sa6->sin6_scope_id == 0)
679			sa6->sin6_scope_id =
680			    ntohs(*(u_int16_t *)&sa6->sin6_addr.s6_addr[2]);
681		sa6->sin6_addr.s6_addr[2] = sa6->sin6_addr.s6_addr[3] = 0;
682	}
683#endif
684}
685
686/* Mask to length table.  To check an invalid value, (length + 1) is used. */
687static int masktolen[256] = {
688	[0xff] = 8 + 1,
689	[0xfe] = 7 + 1,
690	[0xfc] = 6 + 1,
691	[0xf8] = 5 + 1,
692	[0xf0] = 4 + 1,
693	[0xe0] = 3 + 1,
694	[0xc0] = 2 + 1,
695	[0x80] = 1 + 1,
696	[0x00] = 0 + 1,
697};
698
699static const char *
700netname6(struct sockaddr_in6 *sa6, struct sockaddr_in6 *mask)
701{
702	static char line[NI_MAXHOST + sizeof("/xxx") - 1];
703	struct sockaddr_in6 addr;
704	char nline[NI_MAXHOST];
705	u_char *p, *lim;
706	int masklen, illegal = 0, i;
707
708	if (mask) {
709		p = (u_char *)&mask->sin6_addr;
710		for (masklen = 0, lim = p + 16; p < lim; p++) {
711			if (masktolen[*p] > 0)
712				/* -1 is required. */
713				masklen += masktolen[*p] - 1;
714			else
715				illegal++;
716		}
717		if (illegal)
718			xo_error("illegal prefixlen\n");
719
720		memcpy(&addr, sa6, sizeof(addr));
721		for (i = 0; i < 16; ++i)
722			addr.sin6_addr.s6_addr[i] &=
723			    mask->sin6_addr.s6_addr[i];
724		sa6 = &addr;
725	}
726	else
727		masklen = 128;
728
729	if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr))
730		return("default");
731
732	getnameinfo((struct sockaddr *)sa6, sa6->sin6_len, nline, sizeof(nline),
733	    NULL, 0, NI_NUMERICHOST);
734	if (numeric_addr)
735		strlcpy(line, nline, sizeof(line));
736	else
737		getnameinfo((struct sockaddr *)sa6, sa6->sin6_len, line,
738		    sizeof(line), NULL, 0, 0);
739	if (numeric_addr || strcmp(line, nline) == 0)
740		sprintf(&line[strlen(line)], "/%d", masklen);
741
742	return (line);
743}
744#endif /*INET6*/
745
746/*
747 * Print routing statistics
748 */
749void
750rt_stats(void)
751{
752	struct rtstat rtstat;
753	u_long rtsaddr, rttaddr;
754	int rttrash;
755
756	if ((rtsaddr = nl[N_RTSTAT].n_value) == 0) {
757		xo_emit("{W:rtstat: symbol not in namelist}\n");
758		return;
759	}
760	if ((rttaddr = nl[N_RTTRASH].n_value) == 0) {
761		xo_emit("{W:rttrash: symbol not in namelist}\n");
762		return;
763	}
764	kread(rtsaddr, (char *)&rtstat, sizeof (rtstat));
765	kread(rttaddr, (char *)&rttrash, sizeof (rttrash));
766	xo_emit("{T:routing}:\n");
767
768#define	p(f, m) if (rtstat.f || sflag <= 1) \
769	xo_emit(m, rtstat.f, plural(rtstat.f))
770
771	p(rts_badredirect, "\t{:bad-redirects/%hu} "
772	    "{N:/bad routing redirect%s}\n");
773	p(rts_dynamic, "\t{:dynamically-created/%hu} "
774	    "{N:/dynamically created route%s}\n");
775	p(rts_newgateway, "\t{:new-gateways/%hu} "
776	    "{N:/new gateway%s due to redirects}\n");
777	p(rts_unreach, "\t{:unreachable-destination/%hu} "
778	    "{N:/destination%s found unreachable}\n");
779	p(rts_wildcard, "\t{:wildcard-uses/%hu} "
780	    "{N:/use%s of a wildcard route}\n");
781#undef p
782
783	if (rttrash || sflag <= 1)
784		xo_emit("\t{:unused-but-not-freed/%u} "
785		    "{N:/route%s not in table but not freed}\n",
786		    rttrash, plural(rttrash));
787}
788