1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1988, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #if 0
33 #ifndef lint
34 static char sccsid[] = "From: @(#)route.c 8.6 (Berkeley) 4/28/95";
35 #endif /* not lint */
36 #endif
37
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: stable/12/usr.bin/netstat/route.c 366592 2020-10-09 22:59:27Z allanjude $");
40
41 #include <sys/param.h>
42 #include <sys/protosw.h>
43 #include <sys/socket.h>
44 #include <sys/socketvar.h>
45 #include <sys/sysctl.h>
46 #include <sys/time.h>
47
48 #include <net/ethernet.h>
49 #include <net/if.h>
50 #include <net/if_dl.h>
51 #include <net/if_types.h>
52 #include <net/route.h>
53
54 #include <netinet/in.h>
55 #include <netgraph/ng_socket.h>
56
57 #include <arpa/inet.h>
58 #include <ifaddrs.h>
59 #include <libutil.h>
60 #include <netdb.h>
61 #include <stdbool.h>
62 #include <stdint.h>
63 #include <stdio.h>
64 #include <stdlib.h>
65 #include <stdbool.h>
66 #include <string.h>
67 #include <sysexits.h>
68 #include <unistd.h>
69 #include <err.h>
70 #include <libxo/xo.h>
71 #include "netstat.h"
72 #include "nl_defs.h"
73
74 /*
75 * Definitions for showing gateway flags.
76 */
77 static struct bits {
78 u_long b_mask;
79 char b_val;
80 const char *b_name;
81 } bits[] = {
82 { RTF_UP, 'U', "up" },
83 { RTF_GATEWAY, 'G', "gateway" },
84 { RTF_HOST, 'H', "host" },
85 { RTF_REJECT, 'R', "reject" },
86 { RTF_DYNAMIC, 'D', "dynamic" },
87 { RTF_MODIFIED, 'M', "modified" },
88 { RTF_DONE, 'd', "done" }, /* Completed -- for routing msgs only */
89 { RTF_XRESOLVE, 'X', "xresolve" },
90 { RTF_STATIC, 'S', "static" },
91 { RTF_PROTO1, '1', "proto1" },
92 { RTF_PROTO2, '2', "proto2" },
93 { RTF_PROTO3, '3', "proto3" },
94 { RTF_BLACKHOLE,'B', "blackhole" },
95 { RTF_BROADCAST,'b', "broadcast" },
96 #ifdef RTF_LLINFO
97 { RTF_LLINFO, 'L', "llinfo" },
98 #endif
99 { 0 , 0, NULL }
100 };
101
102 struct ifmap_entry {
103 char ifname[IFNAMSIZ];
104 };
105 static struct ifmap_entry *ifmap;
106 static int ifmap_size;
107 static struct timespec uptime;
108
109 static const char *netname4(in_addr_t, in_addr_t);
110 #ifdef INET6
111 static const char *netname6(struct sockaddr_in6 *, struct sockaddr_in6 *);
112 #endif
113 static void p_rtable_sysctl(int, int);
114 static void p_rtentry_sysctl(const char *name, struct rt_msghdr *);
115 static int p_sockaddr(const char *name, struct sockaddr *, struct sockaddr *,
116 int, int);
117 static const char *fmt_sockaddr(struct sockaddr *sa, struct sockaddr *mask,
118 int flags);
119 static void p_flags(int, const char *);
120 static const char *fmt_flags(int f);
121 static void domask(char *, size_t, u_long);
122
123
124 /*
125 * Print routing tables.
126 */
127 void
routepr(int fibnum,int af)128 routepr(int fibnum, int af)
129 {
130 size_t intsize;
131 int numfibs;
132
133 if (live == 0)
134 return;
135
136 intsize = sizeof(int);
137 if (fibnum == -1 &&
138 sysctlbyname("net.my_fibnum", &fibnum, &intsize, NULL, 0) == -1)
139 fibnum = 0;
140 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1)
141 numfibs = 1;
142 if (fibnum < 0 || fibnum > numfibs - 1)
143 errx(EX_USAGE, "%d: invalid fib", fibnum);
144 /*
145 * Since kernel & userland use different timebase
146 * (time_uptime vs time_second) and we are reading kernel memory
147 * directly we should do rt_expire --> expire_time conversion.
148 */
149 if (clock_gettime(CLOCK_UPTIME, &uptime) < 0)
150 err(EX_OSERR, "clock_gettime() failed");
151
152 xo_open_container("route-information");
153 xo_emit("{T:Routing tables}");
154 if (fibnum)
155 xo_emit(" ({L:fib}: {:fib/%d})", fibnum);
156 xo_emit("\n");
157 p_rtable_sysctl(fibnum, af);
158 xo_close_container("route-information");
159 }
160
161
162 /*
163 * Print address family header before a section of the routing table.
164 */
165 void
pr_family(int af1)166 pr_family(int af1)
167 {
168 const char *afname;
169
170 switch (af1) {
171 case AF_INET:
172 afname = "Internet";
173 break;
174 #ifdef INET6
175 case AF_INET6:
176 afname = "Internet6";
177 break;
178 #endif /*INET6*/
179 case AF_ISO:
180 afname = "ISO";
181 break;
182 case AF_CCITT:
183 afname = "X.25";
184 break;
185 case AF_NETGRAPH:
186 afname = "Netgraph";
187 break;
188 default:
189 afname = NULL;
190 break;
191 }
192 if (afname)
193 xo_emit("\n{k:address-family/%s}:\n", afname);
194 else
195 xo_emit("\n{L:Protocol Family} {k:address-family/%d}:\n", af1);
196 }
197
198 /* column widths; each followed by one space */
199 #ifndef INET6
200 #define WID_DST_DEFAULT(af) 18 /* width of destination column */
201 #define WID_GW_DEFAULT(af) 18 /* width of gateway column */
202 #define WID_IF_DEFAULT(af) (Wflag ? 10 : 8) /* width of netif column */
203 #else
204 #define WID_DST_DEFAULT(af) \
205 ((af) == AF_INET6 ? (numeric_addr ? 33: 18) : 18)
206 #define WID_GW_DEFAULT(af) \
207 ((af) == AF_INET6 ? (numeric_addr ? 29 : 18) : 18)
208 #define WID_IF_DEFAULT(af) ((af) == AF_INET6 ? 8 : (Wflag ? 10 : 8))
209 #endif /*INET6*/
210
211 static int wid_dst;
212 static int wid_gw;
213 static int wid_flags;
214 static int wid_pksent;
215 static int wid_mtu;
216 static int wid_if;
217 static int wid_expire;
218
219 /*
220 * Print header for routing table columns.
221 */
222 static void
pr_rthdr(int af1 __unused)223 pr_rthdr(int af1 __unused)
224 {
225
226 if (Wflag) {
227 xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} "
228 "{T:/%*.*s} {T:/%*.*s} {T:/%*s}\n",
229 wid_dst, wid_dst, "Destination",
230 wid_gw, wid_gw, "Gateway",
231 wid_flags, wid_flags, "Flags",
232 wid_pksent, wid_pksent, "Use",
233 wid_mtu, wid_mtu, "Mtu",
234 wid_if, wid_if, "Netif",
235 wid_expire, "Expire");
236 } else {
237 xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} "
238 "{T:/%*s}\n",
239 wid_dst, wid_dst, "Destination",
240 wid_gw, wid_gw, "Gateway",
241 wid_flags, wid_flags, "Flags",
242 wid_if, wid_if, "Netif",
243 wid_expire, "Expire");
244 }
245 }
246
247 static void
p_rtable_sysctl(int fibnum,int af)248 p_rtable_sysctl(int fibnum, int af)
249 {
250 size_t needed;
251 int mib[7];
252 char *buf, *next, *lim;
253 struct rt_msghdr *rtm;
254 struct sockaddr *sa;
255 int fam = AF_UNSPEC, ifindex = 0, size;
256 int need_table_close = false;
257
258 struct ifaddrs *ifap, *ifa;
259 struct sockaddr_dl *sdl;
260
261 /*
262 * Retrieve interface list at first
263 * since we need #ifindex -> if_xname match
264 */
265 if (getifaddrs(&ifap) != 0)
266 err(EX_OSERR, "getifaddrs");
267
268 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
269
270 if (ifa->ifa_addr->sa_family != AF_LINK)
271 continue;
272
273 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
274 ifindex = sdl->sdl_index;
275
276 if (ifindex >= ifmap_size) {
277 size = roundup(ifindex + 1, 32) *
278 sizeof(struct ifmap_entry);
279 if ((ifmap = realloc(ifmap, size)) == NULL)
280 errx(2, "realloc(%d) failed", size);
281 memset(&ifmap[ifmap_size], 0,
282 size - ifmap_size *
283 sizeof(struct ifmap_entry));
284
285 ifmap_size = roundup(ifindex + 1, 32);
286 }
287
288 if (*ifmap[ifindex].ifname != '\0')
289 continue;
290
291 strlcpy(ifmap[ifindex].ifname, ifa->ifa_name, IFNAMSIZ);
292 }
293
294 freeifaddrs(ifap);
295
296 mib[0] = CTL_NET;
297 mib[1] = PF_ROUTE;
298 mib[2] = 0;
299 mib[3] = af;
300 mib[4] = NET_RT_DUMP;
301 mib[5] = 0;
302 mib[6] = fibnum;
303 if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
304 err(EX_OSERR, "sysctl: net.route.0.%d.dump.%d estimate", af,
305 fibnum);
306 if ((buf = malloc(needed)) == NULL)
307 errx(2, "malloc(%lu)", (unsigned long)needed);
308 if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0)
309 err(1, "sysctl: net.route.0.%d.dump.%d", af, fibnum);
310 lim = buf + needed;
311 xo_open_container("route-table");
312 xo_open_list("rt-family");
313 for (next = buf; next < lim; next += rtm->rtm_msglen) {
314 rtm = (struct rt_msghdr *)next;
315 if (rtm->rtm_version != RTM_VERSION)
316 continue;
317 /*
318 * Peek inside header to determine AF
319 */
320 sa = (struct sockaddr *)(rtm + 1);
321 /* Only print family first time. */
322 if (fam != sa->sa_family) {
323 if (need_table_close) {
324 xo_close_list("rt-entry");
325 xo_close_instance("rt-family");
326 }
327 need_table_close = true;
328
329 fam = sa->sa_family;
330 wid_dst = WID_DST_DEFAULT(fam);
331 wid_gw = WID_GW_DEFAULT(fam);
332 wid_flags = 6;
333 wid_pksent = 8;
334 wid_mtu = 6;
335 wid_if = WID_IF_DEFAULT(fam);
336 wid_expire = 6;
337 xo_open_instance("rt-family");
338 pr_family(fam);
339 xo_open_list("rt-entry");
340
341 pr_rthdr(fam);
342 }
343 p_rtentry_sysctl("rt-entry", rtm);
344 }
345 if (need_table_close) {
346 xo_close_list("rt-entry");
347 xo_close_instance("rt-family");
348 }
349 xo_close_list("rt-family");
350 xo_close_container("route-table");
351 free(buf);
352 }
353
354 static void
p_rtentry_sysctl(const char * name,struct rt_msghdr * rtm)355 p_rtentry_sysctl(const char *name, struct rt_msghdr *rtm)
356 {
357 struct sockaddr *sa, *addr[RTAX_MAX];
358 char buffer[128];
359 char prettyname[128];
360 int i, protrusion;
361
362 xo_open_instance(name);
363 sa = (struct sockaddr *)(rtm + 1);
364 for (i = 0; i < RTAX_MAX; i++) {
365 if (rtm->rtm_addrs & (1 << i)) {
366 addr[i] = sa;
367 sa = (struct sockaddr *)((char *)sa + SA_SIZE(sa));
368 }
369 }
370
371 protrusion = p_sockaddr("destination", addr[RTAX_DST],
372 addr[RTAX_NETMASK],
373 rtm->rtm_flags, wid_dst);
374 protrusion = p_sockaddr("gateway", addr[RTAX_GATEWAY], NULL, RTF_HOST,
375 wid_gw - protrusion);
376 snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ",
377 wid_flags - protrusion);
378 p_flags(rtm->rtm_flags, buffer);
379 if (Wflag) {
380 xo_emit("{t:use/%*lu} ", wid_pksent, rtm->rtm_rmx.rmx_pksent);
381
382 if (rtm->rtm_rmx.rmx_mtu != 0)
383 xo_emit("{t:mtu/%*lu} ", wid_mtu, rtm->rtm_rmx.rmx_mtu);
384 else
385 xo_emit("{P:/%*s} ", wid_mtu, "");
386 }
387
388 memset(prettyname, 0, sizeof(prettyname));
389 if (rtm->rtm_index < ifmap_size) {
390 strlcpy(prettyname, ifmap[rtm->rtm_index].ifname,
391 sizeof(prettyname));
392 if (*prettyname == '\0')
393 strlcpy(prettyname, "---", sizeof(prettyname));
394 }
395
396 if (Wflag)
397 xo_emit("{t:interface-name/%*s}", wid_if, prettyname);
398 else
399 xo_emit("{t:interface-name/%*.*s}", wid_if, wid_if,
400 prettyname);
401 if (rtm->rtm_rmx.rmx_expire) {
402 time_t expire_time;
403
404 if ((expire_time = rtm->rtm_rmx.rmx_expire - uptime.tv_sec) > 0)
405 xo_emit(" {:expire-time/%*d}", wid_expire,
406 (int)expire_time);
407 }
408
409 xo_emit("\n");
410 xo_close_instance(name);
411 }
412
413 static int
p_sockaddr(const char * name,struct sockaddr * sa,struct sockaddr * mask,int flags,int width)414 p_sockaddr(const char *name, struct sockaddr *sa, struct sockaddr *mask,
415 int flags, int width)
416 {
417 const char *cp;
418 char buf[128];
419 int protrusion;
420
421 cp = fmt_sockaddr(sa, mask, flags);
422
423 if (width < 0) {
424 snprintf(buf, sizeof(buf), "{:%s/%%s} ", name);
425 xo_emit(buf, cp);
426 protrusion = 0;
427 } else {
428 if (Wflag != 0 || numeric_addr) {
429 snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%s}{]:} ",
430 -width, name);
431 xo_emit(buf, cp);
432 protrusion = strlen(cp) - width;
433 if (protrusion < 0)
434 protrusion = 0;
435 } else {
436 snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%-.*s}{]:} ",
437 -width, name);
438 xo_emit(buf, width, cp);
439 protrusion = 0;
440 }
441 }
442 return (protrusion);
443 }
444
445 static const char *
fmt_sockaddr(struct sockaddr * sa,struct sockaddr * mask,int flags)446 fmt_sockaddr(struct sockaddr *sa, struct sockaddr *mask, int flags)
447 {
448 static char buf[128];
449 const char *cp;
450
451 if (sa == NULL)
452 return ("null");
453
454 switch(sa->sa_family) {
455 #ifdef INET6
456 case AF_INET6:
457 /*
458 * The sa6->sin6_scope_id must be filled here because
459 * this sockaddr is extracted from kmem(4) directly
460 * and has KAME-specific embedded scope id in
461 * sa6->sin6_addr.s6_addr[2].
462 */
463 in6_fillscopeid(satosin6(sa));
464 /* FALLTHROUGH */
465 #endif /*INET6*/
466 case AF_INET:
467 if (flags & RTF_HOST)
468 cp = routename(sa, numeric_addr);
469 else if (mask)
470 cp = netname(sa, mask);
471 else
472 cp = netname(sa, NULL);
473 break;
474 case AF_NETGRAPH:
475 {
476 strlcpy(buf, ((struct sockaddr_ng *)sa)->sg_data,
477 sizeof(buf));
478 cp = buf;
479 break;
480 }
481 case AF_LINK:
482 {
483 #if 0
484 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
485
486 /* Interface route. */
487 if (sdl->sdl_nlen)
488 cp = sdl->sdl_data;
489 else
490 #endif
491 cp = routename(sa, 1);
492 break;
493 }
494 default:
495 {
496 u_char *s = (u_char *)sa->sa_data, *slim;
497 char *cq, *cqlim;
498
499 cq = buf;
500 slim = sa->sa_len + (u_char *) sa;
501 cqlim = cq + sizeof(buf) - sizeof(" ffff");
502 snprintf(cq, sizeof(buf), "(%d)", sa->sa_family);
503 cq += strlen(cq);
504 while (s < slim && cq < cqlim) {
505 snprintf(cq, sizeof(" ff"), " %02x", *s++);
506 cq += strlen(cq);
507 if (s < slim) {
508 snprintf(cq, sizeof("ff"), "%02x", *s++);
509 cq += strlen(cq);
510 }
511 }
512 cp = buf;
513 }
514 }
515
516 return (cp);
517 }
518
519 static void
p_flags(int f,const char * format)520 p_flags(int f, const char *format)
521 {
522 struct bits *p;
523
524 xo_emit(format, fmt_flags(f));
525
526 xo_open_list("flags_pretty");
527 for (p = bits; p->b_mask; p++)
528 if (p->b_mask & f)
529 xo_emit("{le:flags_pretty/%s}", p->b_name);
530 xo_close_list("flags_pretty");
531 }
532
533 static const char *
fmt_flags(int f)534 fmt_flags(int f)
535 {
536 static char name[33];
537 char *flags;
538 struct bits *p = bits;
539
540 for (flags = name; p->b_mask; p++)
541 if (p->b_mask & f)
542 *flags++ = p->b_val;
543 *flags = '\0';
544 return (name);
545 }
546
547 char *
routename(struct sockaddr * sa,int flags)548 routename(struct sockaddr *sa, int flags)
549 {
550 static char line[NI_MAXHOST];
551 int error, f;
552
553 f = (flags) ? NI_NUMERICHOST : 0;
554 error = getnameinfo(sa, sa->sa_len, line, sizeof(line),
555 NULL, 0, f);
556 if (error) {
557 const void *src;
558 switch (sa->sa_family) {
559 #ifdef INET
560 case AF_INET:
561 src = &satosin(sa)->sin_addr;
562 break;
563 #endif /* INET */
564 #ifdef INET6
565 case AF_INET6:
566 src = &satosin6(sa)->sin6_addr;
567 break;
568 #endif /* INET6 */
569 default:
570 return(line);
571 }
572 inet_ntop(sa->sa_family, src, line, sizeof(line) - 1);
573 return (line);
574 }
575 trimdomain(line, strlen(line));
576
577 return (line);
578 }
579
580 #define NSHIFT(m) ( \
581 (m) == IN_CLASSA_NET ? IN_CLASSA_NSHIFT : \
582 (m) == IN_CLASSB_NET ? IN_CLASSB_NSHIFT : \
583 (m) == IN_CLASSC_NET ? IN_CLASSC_NSHIFT : \
584 0)
585
586 static void
domask(char * dst,size_t buflen,u_long mask)587 domask(char *dst, size_t buflen, u_long mask)
588 {
589 int b, i;
590
591 if (mask == 0) {
592 *dst = '\0';
593 return;
594 }
595 i = 0;
596 for (b = 0; b < 32; b++)
597 if (mask & (1 << b)) {
598 int bb;
599
600 i = b;
601 for (bb = b+1; bb < 32; bb++)
602 if (!(mask & (1 << bb))) {
603 i = -1; /* noncontig */
604 break;
605 }
606 break;
607 }
608 if (i == -1)
609 snprintf(dst, buflen, "&0x%lx", mask);
610 else
611 snprintf(dst, buflen, "/%d", 32-i);
612 }
613
614 /*
615 * Return the name of the network whose address is given.
616 */
617 const char *
netname(struct sockaddr * sa,struct sockaddr * mask)618 netname(struct sockaddr *sa, struct sockaddr *mask)
619 {
620 switch (sa->sa_family) {
621 case AF_INET:
622 if (mask != NULL)
623 return (netname4(satosin(sa)->sin_addr.s_addr,
624 satosin(mask)->sin_addr.s_addr));
625 else
626 return (netname4(satosin(sa)->sin_addr.s_addr,
627 INADDR_ANY));
628 break;
629 #ifdef INET6
630 case AF_INET6:
631 return (netname6(satosin6(sa), satosin6(mask)));
632 #endif /* INET6 */
633 default:
634 return (NULL);
635 }
636 }
637
638 static const char *
netname4(in_addr_t in,in_addr_t mask)639 netname4(in_addr_t in, in_addr_t mask)
640 {
641 char *cp = 0;
642 static char line[MAXHOSTNAMELEN + sizeof("&0xffffffff")];
643 char nline[INET_ADDRSTRLEN];
644 struct netent *np = 0;
645 in_addr_t i;
646
647 if (in == INADDR_ANY && mask == 0) {
648 strlcpy(line, "default", sizeof(line));
649 return (line);
650 }
651
652 /* It is ok to supply host address. */
653 in &= mask;
654
655 i = ntohl(in);
656 if (!numeric_addr && i) {
657 np = getnetbyaddr(i >> NSHIFT(ntohl(mask)), AF_INET);
658 if (np != NULL) {
659 cp = np->n_name;
660 trimdomain(cp, strlen(cp));
661 }
662 }
663 if (cp != NULL)
664 strlcpy(line, cp, sizeof(line));
665 else {
666 inet_ntop(AF_INET, &in, nline, sizeof(nline));
667 strlcpy(line, nline, sizeof(line));
668 domask(line + strlen(line), sizeof(line) - strlen(line), ntohl(mask));
669 }
670
671 return (line);
672 }
673
674 #undef NSHIFT
675
676 #ifdef INET6
677 void
in6_fillscopeid(struct sockaddr_in6 * sa6)678 in6_fillscopeid(struct sockaddr_in6 *sa6)
679 {
680 #if defined(__KAME__)
681 /*
682 * XXX: This is a special workaround for KAME kernels.
683 * sin6_scope_id field of SA should be set in the future.
684 */
685 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr) ||
686 IN6_IS_ADDR_MC_NODELOCAL(&sa6->sin6_addr) ||
687 IN6_IS_ADDR_MC_LINKLOCAL(&sa6->sin6_addr)) {
688 if (sa6->sin6_scope_id == 0)
689 sa6->sin6_scope_id =
690 ntohs(*(u_int16_t *)&sa6->sin6_addr.s6_addr[2]);
691 sa6->sin6_addr.s6_addr[2] = sa6->sin6_addr.s6_addr[3] = 0;
692 }
693 #endif
694 }
695
696 /* Mask to length table. To check an invalid value, (length + 1) is used. */
697 static const u_char masktolen[256] = {
698 [0xff] = 8 + 1,
699 [0xfe] = 7 + 1,
700 [0xfc] = 6 + 1,
701 [0xf8] = 5 + 1,
702 [0xf0] = 4 + 1,
703 [0xe0] = 3 + 1,
704 [0xc0] = 2 + 1,
705 [0x80] = 1 + 1,
706 [0x00] = 0 + 1,
707 };
708
709 static const char *
netname6(struct sockaddr_in6 * sa6,struct sockaddr_in6 * mask)710 netname6(struct sockaddr_in6 *sa6, struct sockaddr_in6 *mask)
711 {
712 static char line[NI_MAXHOST + sizeof("/xxx") - 1];
713 struct sockaddr_in6 addr;
714 char nline[NI_MAXHOST];
715 char maskbuf[sizeof("/xxx")];
716 u_char *p, *lim;
717 u_char masklen;
718 int i;
719 bool illegal = false;
720
721 if (mask) {
722 p = (u_char *)&mask->sin6_addr;
723 for (masklen = 0, lim = p + 16; p < lim; p++) {
724 if (masktolen[*p] > 0) {
725 /* -1 is required. */
726 masklen += (masktolen[*p] - 1);
727 } else
728 illegal = true;
729 }
730 if (illegal)
731 xo_error("illegal prefixlen\n");
732
733 memcpy(&addr, sa6, sizeof(addr));
734 for (i = 0; i < 16; ++i)
735 addr.sin6_addr.s6_addr[i] &=
736 mask->sin6_addr.s6_addr[i];
737 sa6 = &addr;
738 }
739 else
740 masklen = 128;
741
742 if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr))
743 return("default");
744
745 getnameinfo((struct sockaddr *)sa6, sa6->sin6_len, nline, sizeof(nline),
746 NULL, 0, NI_NUMERICHOST);
747 if (numeric_addr)
748 strlcpy(line, nline, sizeof(line));
749 else
750 getnameinfo((struct sockaddr *)sa6, sa6->sin6_len, line,
751 sizeof(line), NULL, 0, 0);
752 if (numeric_addr || strcmp(line, nline) == 0) {
753 snprintf(maskbuf, sizeof(maskbuf), "/%d", masklen);
754 strlcat(line, maskbuf, sizeof(line));
755 }
756
757 return (line);
758 }
759 #endif /*INET6*/
760
761 /*
762 * Print routing statistics
763 */
764 void
rt_stats(void)765 rt_stats(void)
766 {
767 struct rtstat rtstat;
768 u_long rtsaddr, rttaddr;
769 int rttrash;
770
771 if ((rtsaddr = nl[N_RTSTAT].n_value) == 0) {
772 xo_emit("{W:rtstat: symbol not in namelist}\n");
773 return;
774 }
775 if ((rttaddr = nl[N_RTTRASH].n_value) == 0) {
776 xo_emit("{W:rttrash: symbol not in namelist}\n");
777 return;
778 }
779 kread(rtsaddr, (char *)&rtstat, sizeof (rtstat));
780 kread(rttaddr, (char *)&rttrash, sizeof (rttrash));
781 xo_emit("{T:routing}:\n");
782
783 #define p(f, m) if (rtstat.f || sflag <= 1) \
784 xo_emit(m, rtstat.f, plural(rtstat.f))
785
786 p(rts_badredirect, "\t{:bad-redirects/%hu} "
787 "{N:/bad routing redirect%s}\n");
788 p(rts_dynamic, "\t{:dynamically-created/%hu} "
789 "{N:/dynamically created route%s}\n");
790 p(rts_newgateway, "\t{:new-gateways/%hu} "
791 "{N:/new gateway%s due to redirects}\n");
792 p(rts_unreach, "\t{:unreachable-destination/%hu} "
793 "{N:/destination%s found unreachable}\n");
794 p(rts_wildcard, "\t{:wildcard-uses/%hu} "
795 "{N:/use%s of a wildcard route}\n");
796 #undef p
797
798 if (rttrash || sflag <= 1)
799 xo_emit("\t{:unused-but-not-freed/%u} "
800 "{N:/route%s not in table but not freed}\n",
801 rttrash, plural(rttrash));
802 }
803