route.c revision 287351 
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 287351 2015-09-01 08:42:04Z hrs $");
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 <nlist.h>
60#include <stdint.h>
61#include <stdio.h>
62#include <stdlib.h>
63#include <stdbool.h>
64#include <string.h>
65#include <sysexits.h>
66#include <unistd.h>
67#include <err.h>
68#include <libxo/xo.h>
69#include "netstat.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
99/*
100 * kvm(3) bindings for every needed symbol
101 */
102static struct nlist rl[] = {
103#define	N_RTSTAT	0
104	{ .n_name = "_rtstat" },
105#define	N_RTTRASH	1
106	{ .n_name = "_rttrash" },
107	{ .n_name = NULL },
108};
109
110struct ifmap_entry {
111	char ifname[IFNAMSIZ];
112};
113static struct ifmap_entry *ifmap;
114static int ifmap_size;
115static struct timespec uptime;
116
117static const char *netname4(in_addr_t, in_addr_t);
118static const char *netname6(struct sockaddr_in6 *, struct sockaddr_in6 *);
119static void p_rtable_sysctl(int, int);
120static void p_rtentry_sysctl(const char *name, struct rt_msghdr *);
121static void p_sockaddr(const char *name, struct sockaddr *, struct sockaddr *,
122    int, int);
123static const char *fmt_sockaddr(struct sockaddr *sa, struct sockaddr *mask,
124    int flags);
125static void p_flags(int, const char *);
126static const char *fmt_flags(int f);
127static void domask(char *, in_addr_t, u_long);
128
129
130/*
131 * Print routing tables.
132 */
133void
134routepr(int fibnum, int af)
135{
136	size_t intsize;
137	int numfibs;
138
139	if (live == 0)
140		return;
141
142	intsize = sizeof(int);
143	if (fibnum == -1 &&
144	    sysctlbyname("net.my_fibnum", &fibnum, &intsize, NULL, 0) == -1)
145		fibnum = 0;
146	if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1)
147		numfibs = 1;
148	if (fibnum < 0 || fibnum > numfibs - 1)
149		errx(EX_USAGE, "%d: invalid fib", fibnum);
150	/*
151	 * Since kernel & userland use different timebase
152	 * (time_uptime vs time_second) and we are reading kernel memory
153	 * directly we should do rt_expire --> expire_time conversion.
154	 */
155	if (clock_gettime(CLOCK_UPTIME, &uptime) < 0)
156		err(EX_OSERR, "clock_gettime() failed");
157
158	xo_open_container("route-information");
159	xo_emit("{T:Routing tables}");
160	if (fibnum)
161		xo_emit(" ({L:fib}: {:fib/%d})", fibnum);
162	xo_emit("\n");
163	p_rtable_sysctl(fibnum, af);
164	xo_close_container("route-information");
165}
166
167
168/*
169 * Print address family header before a section of the routing table.
170 */
171void
172pr_family(int af1)
173{
174	const char *afname;
175
176	switch (af1) {
177	case AF_INET:
178		afname = "Internet";
179		break;
180#ifdef INET6
181	case AF_INET6:
182		afname = "Internet6";
183		break;
184#endif /*INET6*/
185	case AF_ISO:
186		afname = "ISO";
187		break;
188	case AF_CCITT:
189		afname = "X.25";
190		break;
191	case AF_NETGRAPH:
192		afname = "Netgraph";
193		break;
194	default:
195		afname = NULL;
196		break;
197	}
198	if (afname)
199		xo_emit("\n{k:address-family/%s}:\n", afname);
200	else
201		xo_emit("\n{L:Protocol Family} {k:address-family/%d}:\n", af1);
202}
203
204/* column widths; each followed by one space */
205#ifndef INET6
206#define	WID_DST_DEFAULT(af) 	18	/* width of destination column */
207#define	WID_GW_DEFAULT(af)	18	/* width of gateway column */
208#define	WID_IF_DEFAULT(af)	(Wflag ? 10 : 8) /* width of netif column */
209#else
210#define	WID_DST_DEFAULT(af) \
211	((af) == AF_INET6 ? (numeric_addr ? 33: 18) : 18)
212#define	WID_GW_DEFAULT(af) \
213	((af) == AF_INET6 ? (numeric_addr ? 29 : 18) : 18)
214#define	WID_IF_DEFAULT(af)	((af) == AF_INET6 ? 8 : (Wflag ? 10 : 8))
215#endif /*INET6*/
216
217static int wid_dst;
218static int wid_gw;
219static int wid_flags;
220static int wid_pksent;
221static int wid_mtu;
222static int wid_if;
223static int wid_expire;
224
225/*
226 * Print header for routing table columns.
227 */
228static void
229pr_rthdr(int af1 __unused)
230{
231
232	if (Wflag) {
233		xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} "
234		    "{T:/%*.*s} {T:/%*.*s} {T:/%*s}\n",
235			wid_dst,	wid_dst,	"Destination",
236			wid_gw,		wid_gw,		"Gateway",
237			wid_flags,	wid_flags,	"Flags",
238			wid_pksent,	wid_pksent,	"Use",
239			wid_mtu,	wid_mtu,	"Mtu",
240			wid_if,		wid_if,		"Netif",
241			wid_expire,			"Expire");
242	} else {
243		xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} "
244		    "{T:/%*s}\n",
245			wid_dst,	wid_dst,	"Destination",
246			wid_gw,		wid_gw,		"Gateway",
247			wid_flags,	wid_flags,	"Flags",
248			wid_if,		wid_if,		"Netif",
249			wid_expire,			"Expire");
250	}
251}
252
253static void
254p_rtable_sysctl(int fibnum, int af)
255{
256	size_t needed;
257	int mib[7];
258	char *buf, *next, *lim;
259	struct rt_msghdr *rtm;
260	struct sockaddr *sa;
261	int fam = AF_UNSPEC, ifindex = 0, size;
262	int need_table_close = false;
263
264	struct ifaddrs *ifap, *ifa;
265	struct sockaddr_dl *sdl;
266
267	/*
268	 * Retrieve interface list at first
269	 * since we need #ifindex -> if_xname match
270	 */
271	if (getifaddrs(&ifap) != 0)
272		err(EX_OSERR, "getifaddrs");
273
274	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
275
276		if (ifa->ifa_addr->sa_family != AF_LINK)
277			continue;
278
279		sdl = (struct sockaddr_dl *)ifa->ifa_addr;
280		ifindex = sdl->sdl_index;
281
282		if (ifindex >= ifmap_size) {
283			size = roundup(ifindex + 1, 32) *
284			    sizeof(struct ifmap_entry);
285			if ((ifmap = realloc(ifmap, size)) == NULL)
286				errx(2, "realloc(%d) failed", size);
287			memset(&ifmap[ifmap_size], 0,
288			    size - ifmap_size *
289			    sizeof(struct ifmap_entry));
290
291			ifmap_size = roundup(ifindex + 1, 32);
292		}
293
294		if (*ifmap[ifindex].ifname != '\0')
295			continue;
296
297		strlcpy(ifmap[ifindex].ifname, ifa->ifa_name, IFNAMSIZ);
298	}
299
300	freeifaddrs(ifap);
301
302	mib[0] = CTL_NET;
303	mib[1] = PF_ROUTE;
304	mib[2] = 0;
305	mib[3] = af;
306	mib[4] = NET_RT_DUMP;
307	mib[5] = 0;
308	mib[6] = fibnum;
309	if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
310		err(EX_OSERR, "sysctl: net.route.0.%d.dump.%d estimate", af,
311		    fibnum);
312	if ((buf = malloc(needed)) == NULL)
313		errx(2, "malloc(%lu)", (unsigned long)needed);
314	if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0)
315		err(1, "sysctl: net.route.0.%d.dump.%d", af, fibnum);
316	lim  = buf + needed;
317	xo_open_container("route-table");
318	xo_open_list("rt-family");
319	for (next = buf; next < lim; next += rtm->rtm_msglen) {
320		rtm = (struct rt_msghdr *)next;
321		if (rtm->rtm_version != RTM_VERSION)
322			continue;
323		/*
324		 * Peek inside header to determine AF
325		 */
326		sa = (struct sockaddr *)(rtm + 1);
327		/* Only print family first time. */
328		if (fam != sa->sa_family) {
329			if (need_table_close) {
330				xo_close_list("rt-entry");
331				xo_close_instance("rt-family");
332			}
333			need_table_close = true;
334
335			fam = sa->sa_family;
336			wid_dst = WID_DST_DEFAULT(fam);
337			wid_gw = WID_GW_DEFAULT(fam);
338			wid_flags = 6;
339			wid_pksent = 8;
340			wid_mtu = 6;
341			wid_if = WID_IF_DEFAULT(fam);
342			wid_expire = 6;
343			xo_open_instance("rt-family");
344			pr_family(fam);
345			xo_open_list("rt-entry");
346
347			pr_rthdr(fam);
348		}
349		p_rtentry_sysctl("rt-entry", rtm);
350	}
351	if (need_table_close) {
352		xo_close_list("rt-entry");
353		xo_close_instance("rt-family");
354	}
355	xo_close_list("rt-family");
356	xo_close_container("route-table");
357	free(buf);
358}
359
360static void
361p_rtentry_sysctl(const char *name, struct rt_msghdr *rtm)
362{
363	struct sockaddr *sa, *addr[RTAX_MAX];
364	char buffer[128];
365	char prettyname[128];
366	int i;
367
368	xo_open_instance(name);
369	sa = (struct sockaddr *)(rtm + 1);
370	for (i = 0; i < RTAX_MAX; i++) {
371		if (rtm->rtm_addrs & (1 << i))
372			addr[i] = sa;
373		sa = (struct sockaddr *)((char *)sa + SA_SIZE(sa));
374	}
375
376	p_sockaddr("destination", addr[RTAX_DST], addr[RTAX_NETMASK],
377	    rtm->rtm_flags, wid_dst);
378	p_sockaddr("gateway", addr[RTAX_GATEWAY], NULL, RTF_HOST, wid_gw);
379	snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ",
380	    wid_flags);
381	p_flags(rtm->rtm_flags, buffer);
382	if (Wflag) {
383		xo_emit("{t:use/%*lu} ", wid_pksent, rtm->rtm_rmx.rmx_pksent);
384
385		if (rtm->rtm_rmx.rmx_mtu != 0)
386			xo_emit("{t:mtu/%*lu} ", wid_mtu, rtm->rtm_rmx.rmx_mtu);
387		else
388			xo_emit("{P:/%*s} ", wid_mtu, "");
389	}
390
391	memset(prettyname, 0, sizeof(prettyname));
392	if (rtm->rtm_index < ifmap_size) {
393		strlcpy(prettyname, ifmap[rtm->rtm_index].ifname,
394		    sizeof(prettyname));
395		if (*prettyname == '\0')
396			strlcpy(prettyname, "---", sizeof(prettyname));
397	}
398
399	xo_emit("{t:interface-name/%*.*s}", wid_if, wid_if, prettyname);
400	if (rtm->rtm_rmx.rmx_expire) {
401		time_t expire_time;
402
403		if ((expire_time = rtm->rtm_rmx.rmx_expire - uptime.tv_sec) > 0)
404			xo_emit(" {:expire-time/%*d}", wid_expire,
405			    (int)expire_time);
406	}
407
408	xo_emit("\n");
409	xo_close_instance(name);
410}
411
412static void
413p_sockaddr(const char *name, struct sockaddr *sa, struct sockaddr *mask,
414    int flags, int width)
415{
416	const char *cp;
417	char buf[128];
418
419	cp = fmt_sockaddr(sa, mask, flags);
420
421	if (width < 0) {
422		snprintf(buf, sizeof(buf), "{:%s/%%s} ", name);
423		xo_emit(buf, cp);
424	} else {
425		if (Wflag != 0 || numeric_addr) {
426			snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%s}{]:} ",
427			    -width, name);
428			xo_emit(buf, cp);
429		} else {
430			snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%-.*s}{]:} ",
431			    -width, name);
432			xo_emit(buf, width, cp);
433		}
434	}
435}
436
437static const char *
438fmt_sockaddr(struct sockaddr *sa, struct sockaddr *mask, int flags)
439{
440	static char buf[128];
441	const char *cp;
442
443	if (sa == NULL)
444		return ("null");
445
446	switch(sa->sa_family) {
447#ifdef INET6
448	case AF_INET6:
449		/*
450		 * The sa6->sin6_scope_id must be filled here because
451		 * this sockaddr is extracted from kmem(4) directly
452		 * and has KAME-specific embedded scope id in
453		 * sa6->sin6_addr.s6_addr[2].
454		 */
455		in6_fillscopeid(satosin6(sa));
456		/* FALLTHROUGH */
457#endif /*INET6*/
458	case AF_INET:
459		if (flags & RTF_HOST)
460			cp = routename(sa, numeric_addr);
461		else if (mask)
462			cp = netname(sa, mask);
463		else
464			cp = netname(sa, NULL);
465		break;
466	case AF_NETGRAPH:
467	    {
468		strlcpy(buf, ((struct sockaddr_ng *)sa)->sg_data,
469		    sizeof(buf));
470		cp = buf;
471		break;
472	    }
473	case AF_LINK:
474	    {
475#if 0
476		struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
477
478		/* Interface route. */
479		if (sdl->sdl_nlen)
480			cp = sdl->sdl_data;
481		else
482#endif
483			cp = routename(sa, 1);
484		break;
485	    }
486	default:
487	    {
488		u_char *s = (u_char *)sa->sa_data, *slim;
489		char *cq, *cqlim;
490
491		cq = buf;
492		slim =  sa->sa_len + (u_char *) sa;
493		cqlim = cq + sizeof(buf) - 6;
494		cq += sprintf(cq, "(%d)", sa->sa_family);
495		while (s < slim && cq < cqlim) {
496			cq += sprintf(cq, " %02x", *s++);
497			if (s < slim)
498			    cq += sprintf(cq, "%02x", *s++);
499		}
500		cp = buf;
501	    }
502	}
503
504	return (cp);
505}
506
507static void
508p_flags(int f, const char *format)
509{
510	struct bits *p;
511
512	xo_emit(format, fmt_flags(f));
513
514	xo_open_list("flags_pretty");
515	for (p = bits; p->b_mask; p++)
516		if (p->b_mask & f)
517			xo_emit("{le:flags_pretty/%s}", p->b_name);
518	xo_close_list("flags_pretty");
519}
520
521static const char *
522fmt_flags(int f)
523{
524	static char name[33];
525	char *flags;
526	struct bits *p = bits;
527
528	for (flags = name; p->b_mask; p++)
529		if (p->b_mask & f)
530			*flags++ = p->b_val;
531	*flags = '\0';
532	return (name);
533}
534
535char *
536routename(struct sockaddr *sa, int flags)
537{
538	static char line[NI_MAXHOST];
539	int error, f;
540
541	f = (flags) ? NI_NUMERICHOST : 0;
542	error = getnameinfo(sa, sa->sa_len, line, sizeof(line),
543	    NULL, 0, f);
544	if (error) {
545		const void *src;
546		switch (sa->sa_family) {
547#ifdef INET
548		case AF_INET:
549			src = &satosin(sa)->sin_addr;
550			break;
551#endif /* INET */
552#ifdef INET6
553		case AF_INET6:
554			src = &satosin6(sa)->sin6_addr;
555			break;
556#endif /* INET6 */
557		default:
558			return(line);
559		}
560		inet_ntop(sa->sa_family, src, line, sizeof(line) - 1);
561		return (line);
562	}
563	trimdomain(line, strlen(line));
564
565	return (line);
566}
567
568#define	NSHIFT(m) (							\
569	(m) == IN_CLASSA_NET ? IN_CLASSA_NSHIFT :			\
570	(m) == IN_CLASSB_NET ? IN_CLASSB_NSHIFT :			\
571	(m) == IN_CLASSC_NET ? IN_CLASSC_NSHIFT :			\
572	0)
573
574static void
575domask(char *dst, in_addr_t addr __unused, u_long mask)
576{
577	int b, i;
578
579	if (mask == 0) {
580		*dst = '\0';
581		return;
582	}
583	i = 0;
584	for (b = 0; b < 32; b++)
585		if (mask & (1 << b)) {
586			int bb;
587
588			i = b;
589			for (bb = b+1; bb < 32; bb++)
590				if (!(mask & (1 << bb))) {
591					i = -1;	/* noncontig */
592					break;
593				}
594			break;
595		}
596	if (i == -1)
597		sprintf(dst, "&0x%lx", mask);
598	else
599		sprintf(dst, "/%d", 32-i);
600}
601
602/*
603 * Return the name of the network whose address is given.
604 */
605const char *
606netname(struct sockaddr *sa, struct sockaddr *mask)
607{
608	switch (sa->sa_family) {
609	case AF_INET:
610		if (mask != NULL)
611			return (netname4(satosin(sa)->sin_addr.s_addr,
612			    satosin(mask)->sin_addr.s_addr));
613		else
614			return (netname4(satosin(sa)->sin_addr.s_addr,
615			    INADDR_ANY));
616		break;
617#ifdef INET6
618	case AF_INET6:
619		return (netname6(satosin6(sa), satosin6(mask)));
620#endif /* INET6 */
621	default:
622		return (NULL);
623	}
624}
625
626static const char *
627netname4(in_addr_t in, in_addr_t mask)
628{
629	char *cp = 0;
630	static char line[MAXHOSTNAMELEN + sizeof("/xx")];
631	char nline[INET_ADDRSTRLEN];
632	struct netent *np = 0;
633	in_addr_t i;
634
635	if (in == INADDR_ANY && mask == 0) {
636		strlcpy(line, "default", sizeof(line));
637		return (line);
638	}
639
640	/* It is ok to supply host address. */
641	in &= mask;
642
643	i = ntohl(in);
644	if (!numeric_addr && i) {
645		np = getnetbyaddr(i >> NSHIFT(ntohl(mask)), AF_INET);
646		if (np != NULL) {
647			cp = np->n_name;
648			trimdomain(cp, strlen(cp));
649		}
650	}
651	inet_ntop(AF_INET, &in, nline, sizeof(line));
652	if (cp != NULL) {
653		if (strcpy(cp, nline) != 0)
654			return (line);
655		strlcpy(line, cp, sizeof(line));
656	} else
657		strlcpy(line, nline, sizeof(line));
658	domask(line + strlen(line), i, ntohl(mask));
659
660	return (line);
661}
662
663#undef NSHIFT
664
665#ifdef INET6
666void
667in6_fillscopeid(struct sockaddr_in6 *sa6)
668{
669#if defined(__KAME__)
670	/*
671	 * XXX: This is a special workaround for KAME kernels.
672	 * sin6_scope_id field of SA should be set in the future.
673	 */
674	if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr) ||
675	    IN6_IS_ADDR_MC_NODELOCAL(&sa6->sin6_addr) ||
676	    IN6_IS_ADDR_MC_LINKLOCAL(&sa6->sin6_addr)) {
677		if (sa6->sin6_scope_id == 0)
678			sa6->sin6_scope_id =
679			    ntohs(*(u_int16_t *)&sa6->sin6_addr.s6_addr[2]);
680		sa6->sin6_addr.s6_addr[2] = sa6->sin6_addr.s6_addr[3] = 0;
681	}
682#endif
683}
684
685/* Mask to length table.  To check an invalid value, (length + 1) is used. */
686static int masktolen[256] = {
687	[0xff] = 8 + 1,
688	[0xfe] = 7 + 1,
689	[0xfc] = 6 + 1,
690	[0xf8] = 5 + 1,
691	[0xf0] = 4 + 1,
692	[0xe0] = 3 + 1,
693	[0xc0] = 2 + 1,
694	[0x80] = 1 + 1,
695	[0x00] = 0 + 1,
696};
697
698static const char *
699netname6(struct sockaddr_in6 *sa6, struct sockaddr_in6 *mask)
700{
701	static char line[NI_MAXHOST + sizeof("/xxx") - 1];
702	char nline[NI_MAXHOST];
703	u_char *p, *lim;
704	int masklen, illegal = 0;
705
706	if (mask) {
707		p = (u_char *)&mask->sin6_addr;
708		for (masklen = 0, lim = p + 16; p < lim; p++) {
709			if (masktolen[*p] > 0)
710				/* -1 is required. */
711				masklen += masktolen[*p] - 1;
712			else
713				illegal++;
714		}
715		if (illegal)
716			xo_error("illegal prefixlen\n");
717	}
718	else
719		masklen = 128;
720
721	if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr))
722		return("default");
723
724	getnameinfo((struct sockaddr *)sa6, sa6->sin6_len, nline, sizeof(nline),
725	    NULL, 0, NI_NUMERICHOST);
726	if (numeric_addr)
727		strlcpy(line, nline, sizeof(line));
728	else
729		getnameinfo((struct sockaddr *)sa6, sa6->sin6_len, line,
730		    sizeof(line), NULL, 0, 0);
731	if (numeric_addr || strcmp(line, nline) == 0)
732		sprintf(&line[strlen(line)], "/%d", masklen);
733
734	return (line);
735}
736#endif /*INET6*/
737
738/*
739 * Print routing statistics
740 */
741void
742rt_stats(void)
743{
744	struct rtstat rtstat;
745	u_long rtsaddr, rttaddr;
746	int rttrash;
747
748	kresolve_list(rl);
749
750	if ((rtsaddr = rl[N_RTSTAT].n_value) == 0) {
751		xo_emit("{W:rtstat: symbol not in namelist}\n");
752		return;
753	}
754	if ((rttaddr = rl[N_RTTRASH].n_value) == 0) {
755		xo_emit("{W:rttrash: symbol not in namelist}\n");
756		return;
757	}
758	kread(rtsaddr, (char *)&rtstat, sizeof (rtstat));
759	kread(rttaddr, (char *)&rttrash, sizeof (rttrash));
760	xo_emit("{T:routing}:\n");
761
762#define	p(f, m) if (rtstat.f || sflag <= 1) \
763	xo_emit(m, rtstat.f, plural(rtstat.f))
764
765	p(rts_badredirect, "\t{:bad-redirects/%hu} "
766	    "{N:/bad routing redirect%s}\n");
767	p(rts_dynamic, "\t{:dynamically-created/%hu} "
768	    "{N:/dynamically created route%s}\n");
769	p(rts_newgateway, "\t{:new-gateways/%hu} "
770	    "{N:/new gateway%s due to redirects}\n");
771	p(rts_unreach, "\t{:unreachable-destination/%hu} "
772	    "{N:/destination%s found unreachable}\n");
773	p(rts_wildcard, "\t{:wildcard-uses/%hu} "
774	    "{N:/use%s of a wildcard route}\n");
775#undef p
776
777	if (rttrash || sflag <= 1)
778		xo_emit("\t{:unused-but-not-freed/%u} "
779		    "{N:/route%s not in table but not freed}\n",
780		    rttrash, plural(rttrash));
781}
782