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[netbsd-mini2440.git] / usr.sbin / route6d / route6d.c
blob6896c63f95ec5bb0df75780b1fd83095a0cf02b6
1 /* $NetBSD: route6d.c,v 1.61 2008/01/21 20:46:58 dyoung Exp $ */
2 /* $KAME: route6d.c,v 1.94 2002/10/26 20:08:55 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * 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 project 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 PROJECT 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 PROJECT 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/cdefs.h>
34 #ifndef lint
35 __RCSID("$NetBSD: route6d.c,v 1.61 2008/01/21 20:46:58 dyoung Exp $");
36 #endif
37
38 #include <stdbool.h>
39 #include <stdio.h>
40
41 #include <time.h>
42 #include <unistd.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <signal.h>
46 #include <stdarg.h>
47 #include <syslog.h>
48 #include <stddef.h>
49 #include <errno.h>
50 #include <err.h>
51 #include <util.h>
52 #include <poll.h>
53
54 #include <sys/types.h>
55 #include <sys/param.h>
56 #include <sys/file.h>
57 #include <sys/socket.h>
58 #include <sys/ioctl.h>
59 #include <sys/sysctl.h>
60 #include <sys/uio.h>
61 #include <net/if.h>
62 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
63 #include <net/if_var.h>
64 #endif /* __FreeBSD__ >= 3 */
65 #define KERNEL 1
66 #define _KERNEL 1
67 #include <net/route.h>
68 #undef KERNEL
69 #undef _KERNEL
70 #include <netinet/in.h>
71 #include <netinet/in_var.h>
72 #include <netinet/ip6.h>
73 #include <netinet/udp.h>
74 #include <netdb.h>
75 #include <ifaddrs.h>
76
77 #include <arpa/inet.h>
78
79 #include "route6d.h"
80
81 #define MAXFILTER 40
82
83 #ifdef DEBUG
84 #define INIT_INTERVAL6 6
85 #else
86 #define INIT_INTERVAL6 10 /* Wait to submit a initial riprequest */
87 #endif
88
89 /* alignment constraint for routing socket */
90 #define ROUNDUP(a) \
91 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
92 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
93
94 /*
95 * Following two macros are highly depending on KAME Release
96 */
97 #define IN6_LINKLOCAL_IFINDEX(addr) \
98 ((addr).s6_addr[2] << 8 | (addr).s6_addr[3])
99
100 #define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \
101 do { \
102 (addr).s6_addr[2] = ((index) >> 8) & 0xff; \
103 (addr).s6_addr[3] = (index) & 0xff; \
104 } while (0)
105
106 struct ifc { /* Configuration of an interface */
107 char *ifc_name; /* if name */
108 struct ifc *ifc_next;
109 int ifc_index; /* if index */
110 int ifc_mtu; /* if mtu */
111 int ifc_metric; /* if metric */
112 u_int ifc_flags; /* flags */
113 short ifc_cflags; /* IFC_XXX */
114 struct in6_addr ifc_mylladdr; /* my link-local address */
115 struct sockaddr_in6 ifc_ripsin; /* rip multicast address */
116 struct iff *ifc_filter; /* filter structure */
117 struct ifac *ifc_addr; /* list of AF_INET6 addresses */
118 int ifc_joined; /* joined to ff02::9 */
119 };
120
121 struct ifac { /* Address associated to an interface */
122 struct ifc *ifa_conf; /* back pointer */
123 struct ifac *ifa_next;
124 struct in6_addr ifa_addr; /* address */
125 struct in6_addr ifa_raddr; /* remote address, valid in p2p */
126 int ifa_plen; /* prefix length */
127 };
128
129 struct iff {
130 int iff_type;
131 struct in6_addr iff_addr;
132 int iff_plen;
133 struct iff *iff_next;
134 };
135
136 struct ifc *ifc;
137 int nifc; /* number of valid ifc's */
138 struct ifc **index2ifc;
139 int nindex2ifc;
140 struct ifc *loopifcp = NULL; /* pointing to loopback */
141 struct pollfd set[2];
142 int rtsock; /* the routing socket */
143 int ripsock; /* socket to send/receive RIP datagram */
144
145 struct rip6 *ripbuf; /* packet buffer for sending */
146
147 /*
148 * Maintain the routes in a linked list. When the number of the routes
149 * grows, somebody would like to introduce a hash based or a radix tree
150 * based structure. I believe the number of routes handled by RIP is
151 * limited and I don't have to manage a complex data structure, however.
152 *
153 * One of the major drawbacks of the linear linked list is the difficulty
154 * of representing the relationship between a couple of routes. This may
155 * be a significant problem when we have to support route aggregation with
156 * supressing the specifices covered by the aggregate.
157 */
158
159 struct riprt {
160 struct riprt *rrt_next; /* next destination */
161 struct riprt *rrt_same; /* same destination - future use */
162 struct netinfo6 rrt_info; /* network info */
163 struct in6_addr rrt_gw; /* gateway */
164 u_long rrt_flags; /* kernel routing table flags */
165 u_long rrt_rflags; /* route6d routing table flags */
166 time_t rrt_t; /* when the route validated */
167 int rrt_index; /* ifindex from which this route got */
168 };
169
170 struct riprt *riprt = 0;
171
172 int dflag = 0; /* debug flag */
173 int qflag = 0; /* quiet flag */
174 int nflag = 0; /* don't update kernel routing table */
175 int aflag = 0; /* age out even the statically defined routes */
176 int hflag = 0; /* don't split horizon */
177 int lflag = 0; /* exchange site local routes */
178 int sflag = 0; /* announce static routes w/ split horizon */
179 int Sflag = 0; /* announce static routes to every interface */
180 unsigned long routetag = 0; /* route tag attached on originating case */
181
182 char *filter[MAXFILTER];
183 int filtertype[MAXFILTER];
184 int nfilter = 0;
185
186 pid_t pid;
187
188 struct sockaddr_storage ripsin;
189
190 struct rtentry rtentry;
191
192 int interval = 1;
193 time_t nextalarm = 0;
194 time_t sup_trig_update = 0;
195
196 FILE *rtlog = NULL;
197
198 int logopened = 0;
199
200 static int seq = 0;
201
202 volatile sig_atomic_t seenalrm;
203 volatile sig_atomic_t seenquit;
204 volatile sig_atomic_t seenusr1;
205
206 #define RRTF_AGGREGATE 0x08000000
207 #define RRTF_NOADVERTISE 0x10000000
208 #define RRTF_NH_NOT_LLADDR 0x20000000
209 #define RRTF_SENDANYWAY 0x40000000
210 #define RRTF_CHANGED 0x80000000
211
212 int main(int, char **);
213 void sighandler(int);
214 void ripalarm(void);
215 void riprecv(void);
216 void ripsend(struct ifc *, struct sockaddr_in6 *, int);
217 int out_filter(struct riprt *, struct ifc *);
218 void init(void);
219 void sockopt(struct ifc *);
220 void ifconfig(void);
221 void ifconfig1(const char *, const struct sockaddr *, struct ifc *, int);
222 void rtrecv(void);
223 int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *,
224 const struct sockaddr_in6 *);
225 int rt_deladdr(struct ifc *, const struct sockaddr_in6 *,
226 const struct sockaddr_in6 *);
227 void filterconfig(void);
228 int getifmtu(int);
229 const char *
230 rttypes(struct rt_msghdr *);
231 const char *
232 rtflags(struct rt_msghdr *);
233 const char *
234 ifflags(int);
235 int ifrt(struct ifc *, int);
236 void ifrt_p2p(struct ifc *, int);
237 void applymask(struct in6_addr *, struct in6_addr *);
238 void applyplen(struct in6_addr *, int);
239 void ifrtdump(int);
240 void ifdump(int);
241 void ifdump0(FILE *, const struct ifc *);
242 void rtdump(int);
243 void rt_entry(struct rt_msghdr *, int);
244 void rtdexit(void);
245 void riprequest(struct ifc *, struct netinfo6 *, int,
246 struct sockaddr_in6 *);
247 void ripflush(struct ifc *, struct sockaddr_in6 *);
248 void sendrequest(struct ifc *);
249 int sin6mask2len(const struct sockaddr_in6 *);
250 int mask2len(const struct in6_addr *, int);
251 int sendpacket(struct sockaddr_in6 *, int);
252 int addroute(struct riprt *, const struct in6_addr *, struct ifc *);
253 int delroute(struct netinfo6 *, struct in6_addr *);
254 struct in6_addr *
255 getroute(struct netinfo6 *, struct in6_addr *);
256 void krtread(int);
257 int tobeadv(struct riprt *, struct ifc *);
258 char * allocopy(char *);
259 char * hms(void);
260 const char *
261 inet6_n2p(const struct in6_addr *);
262 struct ifac *
263 ifa_match(const struct ifc *, const struct in6_addr *, int);
264 struct in6_addr *
265 plen2mask(int);
266 struct riprt *
267 rtsearch(struct netinfo6 *, struct riprt **);
268 int ripinterval(int);
269 time_t ripsuptrig(void);
270 void fatal(const char *, ...)
271 __attribute__((__format__(__printf__, 1, 2)));
272 void trace(int, const char *, ...)
273 __attribute__((__format__(__printf__, 2, 3)));
274 void tracet(int, const char *, ...)
275 __attribute__((__format__(__printf__, 2, 3)));
276 unsigned int
277 if_maxindex(void);
278 struct ifc *
279 ifc_find(char *);
280 struct iff *
281 iff_find(struct ifc *, int);
282 void setindex2ifc(int, struct ifc *);
283
284 #define MALLOC(type) ((type *)malloc(sizeof(type)))
285
286 int
287 main(int argc, char **argv)
288 {
289 int ch;
290 int error = 0;
291 struct ifc *ifcp;
292 sigset_t mask, omask;
293 char *progname;
294 char *ep;
295
296 progname = strrchr(*argv, '/');
297 if (progname)
298 progname++;
299 else
300 progname = *argv;
301
302 pid = getpid();
303 while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) {
304 switch (ch) {
305 case 'A':
306 case 'N':
307 case 'O':
308 case 'T':
309 case 'L':
310 if (nfilter >= MAXFILTER) {
311 fatal("Exceeds MAXFILTER");
312 /*NOTREACHED*/
313 }
314 filtertype[nfilter] = ch;
315 filter[nfilter++] = allocopy(optarg);
316 break;
317 case 't':
318 ep = NULL;
319 routetag = strtoul(optarg, &ep, 0);
320 if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) {
321 fatal("invalid route tag");
322 /*NOTREACHED*/
323 }
324 break;
325 case 'R':
326 if ((rtlog = fopen(optarg, "w")) == NULL) {
327 fatal("Can not write to routelog");
328 /*NOTREACHED*/
329 }
330 break;
331 #define FLAG(c, flag, n) case c: do { flag = n; break; } while(0)
332 FLAG('a', aflag, 1); break;
333 FLAG('d', dflag, 1); break;
334 FLAG('D', dflag, 2); break;
335 FLAG('h', hflag, 1); break;
336 FLAG('l', lflag, 1); break;
337 FLAG('n', nflag, 1); break;
338 FLAG('q', qflag, 1); break;
339 FLAG('s', sflag, 1); break;
340 FLAG('S', Sflag, 1); break;
341 #undef FLAG
342 default:
343 fatal("Invalid option specified, terminating");
344 /*NOTREACHED*/
345 }
346 }
347 argc -= optind;
348 argv += optind;
349 if (argc > 0) {
350 fatal("bogus extra arguments");
351 /*NOTREACHED*/
352 }
353
354 if (geteuid()) {
355 nflag = 1;
356 fprintf(stderr, "No kernel update is allowed\n");
357 }
358
359 if (dflag == 0) {
360 if (daemon(0, 0) < 0) {
361 fatal("daemon");
362 /*NOTREACHED*/
363 }
364 }
365
366 openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
367 logopened++;
368
369 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL)
370 fatal("malloc");
371 memset(ripbuf, 0, RIP6_MAXMTU);
372 ripbuf->rip6_cmd = RIP6_RESPONSE;
373 ripbuf->rip6_vers = RIP6_VERSION;
374 ripbuf->rip6_res1[0] = 0;
375 ripbuf->rip6_res1[1] = 0;
376
377 init();
378 ifconfig();
379 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
380 if (ifcp->ifc_index < 0) {
381 fprintf(stderr,
382 "No ifindex found at %s (no link-local address?)\n",
383 ifcp->ifc_name);
384 error++;
385 }
386 }
387 if (error)
388 exit(1);
389 if (loopifcp == NULL) {
390 fatal("No loopback found");
391 /*NOTREACHED*/
392 }
393 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
394 ifrt(ifcp, 0);
395 filterconfig();
396 krtread(0);
397 if (dflag)
398 ifrtdump(0);
399
400 pidfile(NULL);
401
402 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) {
403 fatal("malloc");
404 /*NOTREACHED*/
405 }
406 memset(ripbuf, 0, RIP6_MAXMTU);
407 ripbuf->rip6_cmd = RIP6_RESPONSE;
408 ripbuf->rip6_vers = RIP6_VERSION;
409 ripbuf->rip6_res1[0] = 0;
410 ripbuf->rip6_res1[1] = 0;
411
412 if (signal(SIGALRM, sighandler) == SIG_ERR ||
413 signal(SIGQUIT, sighandler) == SIG_ERR ||
414 signal(SIGTERM, sighandler) == SIG_ERR ||
415 signal(SIGUSR1, sighandler) == SIG_ERR ||
416 signal(SIGHUP, sighandler) == SIG_ERR ||
417 signal(SIGINT, sighandler) == SIG_ERR) {
418 fatal("signal");
419 /*NOTREACHED*/
420 }
421 /*
422 * To avoid rip packet congestion (not on a cable but in this
423 * process), wait for a moment to send the first RIP6_RESPONSE
424 * packets.
425 */
426 alarm(ripinterval(INIT_INTERVAL6));
427
428 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
429 if (iff_find(ifcp, 'N'))
430 continue;
431 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
432 sendrequest(ifcp);
433 }
434
435 syslog(LOG_INFO, "**** Started ****");
436 sigemptyset(&mask);
437 sigaddset(&mask, SIGALRM);
438 while (1) {
439 if (seenalrm) {
440 ripalarm();
441 seenalrm = 0;
442 continue;
443 }
444 if (seenquit) {
445 rtdexit();
446 seenquit = 0;
447 continue;
448 }
449 if (seenusr1) {
450 ifrtdump(SIGUSR1);
451 seenusr1 = 0;
452 continue;
453 }
454
455 switch (poll(set, 2, INFTIM))
456 {
457 case -1:
458 if (errno != EINTR) {
459 fatal("poll");
460 /*NOTREACHED*/
461 }
462 continue;
463 case 0:
464 continue;
465 default:
466 if (set[0].revents & POLLIN)
467 {
468 sigprocmask(SIG_BLOCK, &mask, &omask);
469 riprecv();
470 sigprocmask(SIG_SETMASK, &omask, NULL);
471 }
472 if (set[1].revents & POLLIN)
473 {
474 sigprocmask(SIG_BLOCK, &mask, &omask);
475 rtrecv();
476 sigprocmask(SIG_SETMASK, &omask, NULL);
477 }
478 }
479 }
480 }
481
482 void
483 sighandler(int signo)
484 {
485
486 switch (signo) {
487 case SIGALRM:
488 seenalrm++;
489 break;
490 case SIGQUIT:
491 case SIGTERM:
492 seenquit++;
493 break;
494 case SIGUSR1:
495 case SIGHUP:
496 case SIGINT:
497 seenusr1++;
498 break;
499 }
500 }
501
502 /*
503 * gracefully exits after resetting sockopts.
504 */
505 /* ARGSUSED */
506 void
507 rtdexit(void)
508 {
509 struct riprt *rrt;
510
511 alarm(0);
512 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
513 if (rrt->rrt_rflags & RRTF_AGGREGATE) {
514 delroute(&rrt->rrt_info, &rrt->rrt_gw);
515 }
516 }
517 close(ripsock);
518 close(rtsock);
519 syslog(LOG_INFO, "**** Terminated ****");
520 closelog();
521 exit(1);
522 }
523
524 /*
525 * Called periodically:
526 * 1. age out the learned route. remove it if necessary.
527 * 2. submit RIP6_RESPONSE packets.
528 * Invoked in every SUPPLY_INTERVAL6 (30) seconds. I believe we don't have
529 * to invoke this function in every 1 or 5 or 10 seconds only to age the
530 * routes more precisely.
531 */
532 /* ARGSUSED */
533 void
534 ripalarm(void)
535 {
536 struct ifc *ifcp;
537 struct riprt *rrt, *rrt_prev, *rrt_next;
538 time_t t_lifetime, t_holddown;
539
540 /* age the RIP routes */
541 rrt_prev = 0;
542 t_lifetime = time(NULL) - RIP_LIFETIME;
543 t_holddown = t_lifetime - RIP_HOLDDOWN;
544 for (rrt = riprt; rrt; rrt = rrt_next) {
545 rrt_next = rrt->rrt_next;
546
547 if (rrt->rrt_t == 0) {
548 rrt_prev = rrt;
549 continue;
550 }
551 if (rrt->rrt_t < t_holddown) {
552 if (rrt_prev) {
553 rrt_prev->rrt_next = rrt->rrt_next;
554 } else {
555 riprt = rrt->rrt_next;
556 }
557 delroute(&rrt->rrt_info, &rrt->rrt_gw);
558 free(rrt);
559 continue;
560 }
561 if (rrt->rrt_t < t_lifetime)
562 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
563 rrt_prev = rrt;
564 }
565 /* Supply updates */
566 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
567 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
568 ripsend(ifcp, &ifcp->ifc_ripsin, 0);
569 }
570 alarm(ripinterval(SUPPLY_INTERVAL6));
571 }
572
573 void
574 init(void)
575 {
576 int i, error;
577 const int int0 = 0, int1 = 1, int255 = 255;
578 struct addrinfo hints, *res;
579 char port[NI_MAXSERV];
580
581 ifc = (struct ifc *)NULL;
582 nifc = 0;
583 nindex2ifc = 0; /*initial guess*/
584 index2ifc = NULL;
585 snprintf(port, sizeof(port), "%u", RIP6_PORT);
586
587 memset(&hints, 0, sizeof(hints));
588 hints.ai_family = PF_INET6;
589 hints.ai_socktype = SOCK_DGRAM;
590 hints.ai_flags = AI_PASSIVE;
591 error = getaddrinfo(NULL, port, &hints, &res);
592 if (error) {
593 fatal("%s", gai_strerror(error));
594 /*NOTREACHED*/
595 }
596 if (res->ai_next) {
597 fatal(":: resolved to multiple address");
598 /*NOTREACHED*/
599 }
600
601 ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
602 if (ripsock < 0) {
603 fatal("rip socket");
604 /*NOTREACHED*/
605 }
606 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_V6ONLY,
607 &int1, sizeof(int1)) < 0) {
608 fatal("rip IPV6_V6ONLY");
609 /*NOTREACHED*/
610 }
611 if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) {
612 fatal("rip bind");
613 /*NOTREACHED*/
614 }
615 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
616 &int255, sizeof(int255)) < 0) {
617 fatal("rip IPV6_MULTICAST_HOPS");
618 /*NOTREACHED*/
619 }
620 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
621 &int0, sizeof(int0)) < 0) {
622 fatal("rip IPV6_MULTICAST_LOOP");
623 /*NOTREACHED*/
624 }
625
626 i = 1;
627 #ifdef IPV6_RECVPKTINFO
628 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i,
629 sizeof(i)) < 0) {
630 fatal("rip IPV6_RECVPKTINFO");
631 /*NOTREACHED*/
632 }
633 #else /* old adv. API */
634 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, &i,
635 sizeof(i)) < 0) {
636 fatal("rip IPV6_PKTINFO");
637 /*NOTREACHED*/
638 }
639 #endif
640
641 memset(&hints, 0, sizeof(hints));
642 hints.ai_family = PF_INET6;
643 hints.ai_socktype = SOCK_DGRAM;
644 error = getaddrinfo(RIP6_DEST, port, &hints, &res);
645 if (error) {
646 fatal("%s", gai_strerror(error));
647 /*NOTREACHED*/
648 }
649 if (res->ai_next) {
650 fatal("%s resolved to multiple address", RIP6_DEST);
651 /*NOTREACHED*/
652 }
653 memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
654
655 set[0].fd = ripsock;
656 set[0].events = POLLIN;
657
658 if (nflag == 0) {
659 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
660 fatal("route socket");
661 /*NOTREACHED*/
662 }
663 set[1].fd = rtsock;
664 set[1].events = POLLIN;
665 } else {
666 set[1].fd = -1;
667 }
668 }
669
670 #define RIPSIZE(n) \
671 (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6))
672
673 /*
674 * ripflush flushes the rip datagram stored in the rip buffer
675 */
676 static int nrt;
677 static struct netinfo6 *nip;
678
679 void
680 ripflush(struct ifc *ifcp, struct sockaddr_in6 *sin6)
681 {
682 int i;
683 int error;
684
685 if (ifcp)
686 tracet(1, "Send(%s): info(%d) to %s.%d\n",
687 ifcp->ifc_name, nrt,
688 inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port));
689 else
690 tracet(1, "Send: info(%d) to %s.%d\n",
691 nrt, inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port));
692 if (dflag >= 2) {
693 nip = ripbuf->rip6_nets;
694 for (i = 0; i < nrt; i++, nip++) {
695 if (nip->rip6_metric == NEXTHOP_METRIC) {
696 if (IN6_IS_ADDR_UNSPECIFIED(&nip->rip6_dest))
697 trace(2, " NextHop reset");
698 else {
699 trace(2, " NextHop %s",
700 inet6_n2p(&nip->rip6_dest));
701 }
702 } else {
703 trace(2, " %s/%d[%d]",
704 inet6_n2p(&nip->rip6_dest),
705 nip->rip6_plen, nip->rip6_metric);
706 }
707 if (nip->rip6_tag) {
708 trace(2, " tag=0x%04x",
709 ntohs(nip->rip6_tag) & 0xffff);
710 }
711 trace(2, "\n");
712 }
713 }
714 error = sendpacket(sin6, RIPSIZE(nrt));
715 if (error == EAFNOSUPPORT && ifcp) {
716 /* Protocol not supported */
717 tracet(1, "Could not send info to %s (%s): "
718 "set IFF_UP to 0\n",
719 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
720 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */
721 }
722 nrt = 0; nip = ripbuf->rip6_nets;
723 }
724
725 /*
726 * Generate RIP6_RESPONSE packets and send them.
727 */
728 void
729 ripsend(struct ifc *ifcp, struct sockaddr_in6 *sin6, int flag)
730 {
731 struct riprt *rrt;
732 struct in6_addr *nh; /* next hop */
733 int maxrte;
734
735 if (qflag)
736 return;
737
738 if (ifcp == NULL) {
739 /*
740 * Request from non-link local address is not
741 * a regular route6d update.
742 */
743 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) -
744 sizeof(struct udphdr) -
745 sizeof(struct rip6) + sizeof(struct netinfo6)) /
746 sizeof(struct netinfo6);
747 nrt = 0; nip = ripbuf->rip6_nets; nh = NULL;
748 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
749 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
750 continue;
751 /* Put the route to the buffer */
752 *nip = rrt->rrt_info;
753 nip++; nrt++;
754 if (nrt == maxrte) {
755 ripflush(NULL, sin6);
756 nh = NULL;
757 }
758 }
759 if (nrt) /* Send last packet */
760 ripflush(NULL, sin6);
761 return;
762 }
763
764 if ((flag & RRTF_SENDANYWAY) == 0 &&
765 (qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
766 return;
767
768 /* -N: no use */
769 if (iff_find(ifcp, 'N') != NULL)
770 return;
771
772 /* -T: generate default route only */
773 if (iff_find(ifcp, 'T') != NULL) {
774 struct netinfo6 rrt_info;
775 memset(&rrt_info, 0, sizeof(struct netinfo6));
776 rrt_info.rip6_dest = in6addr_any;
777 rrt_info.rip6_plen = 0;
778 rrt_info.rip6_metric = 1;
779 rrt_info.rip6_metric += ifcp->ifc_metric;
780 rrt_info.rip6_tag = htons(routetag & 0xffff);
781 nip = ripbuf->rip6_nets;
782 *nip = rrt_info;
783 nrt = 1;
784 ripflush(ifcp, sin6);
785 return;
786 }
787
788 maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) -
789 sizeof(struct udphdr) -
790 sizeof(struct rip6) + sizeof(struct netinfo6)) /
791 sizeof(struct netinfo6);
792
793 nrt = 0; nip = ripbuf->rip6_nets; nh = NULL;
794 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
795 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
796 continue;
797
798 /* Need to check filter here */
799 if (out_filter(rrt, ifcp) == 0)
800 continue;
801
802 /* Check split horizon and other conditions */
803 if (tobeadv(rrt, ifcp) == 0)
804 continue;
805
806 /* Only considers the routes with flag if specified */
807 if ((flag & RRTF_CHANGED) &&
808 (rrt->rrt_rflags & RRTF_CHANGED) == 0)
809 continue;
810
811 /* Check nexthop */
812 if (rrt->rrt_index == ifcp->ifc_index &&
813 !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) &&
814 (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) {
815 if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) {
816 if (nrt == maxrte - 2)
817 ripflush(ifcp, sin6);
818 nip->rip6_dest = rrt->rrt_gw;
819 if (IN6_IS_ADDR_LINKLOCAL(&nip->rip6_dest))
820 SET_IN6_LINKLOCAL_IFINDEX(nip->rip6_dest, 0);
821 nip->rip6_plen = 0;
822 nip->rip6_tag = 0;
823 nip->rip6_metric = NEXTHOP_METRIC;
824 nh = &rrt->rrt_gw;
825 nip++; nrt++;
826 }
827 } else if (nh && (rrt->rrt_index != ifcp->ifc_index ||
828 !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) ||
829 rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) {
830 /* Reset nexthop */
831 if (nrt == maxrte - 2)
832 ripflush(ifcp, sin6);
833 memset(nip, 0, sizeof(struct netinfo6));
834 nip->rip6_metric = NEXTHOP_METRIC;
835 nh = NULL;
836 nip++; nrt++;
837 }
838
839 /* Put the route to the buffer */
840 *nip = rrt->rrt_info;
841 nip++; nrt++;
842 if (nrt == maxrte) {
843 ripflush(ifcp, sin6);
844 nh = NULL;
845 }
846 }
847 if (nrt) /* Send last packet */
848 ripflush(ifcp, sin6);
849 }
850
851 /*
852 * outbound filter logic, per-route/interface.
853 */
854 int
855 out_filter(struct riprt *rrt, struct ifc *ifcp)
856 {
857 struct iff *iffp;
858 struct in6_addr ia;
859 int ok;
860
861 /*
862 * -A: filter out less specific routes, if we have aggregated
863 * route configured.
864 */
865 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
866 if (iffp->iff_type != 'A')
867 continue;
868 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen)
869 continue;
870 ia = rrt->rrt_info.rip6_dest;
871 applyplen(&ia, iffp->iff_plen);
872 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr))
873 return 0;
874 }
875
876 /*
877 * if it is an aggregated route, advertise it only to the
878 * interfaces specified on -A.
879 */
880 if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) {
881 ok = 0;
882 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
883 if (iffp->iff_type != 'A')
884 continue;
885 if (rrt->rrt_info.rip6_plen == iffp->iff_plen &&
886 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
887 &iffp->iff_addr)) {
888 ok = 1;
889 break;
890 }
891 }
892 if (!ok)
893 return 0;
894 }
895
896 /*
897 * -O: advertise only if prefix matches the configured prefix.
898 */
899 if (iff_find(ifcp, 'O')) {
900 ok = 0;
901 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
902 if (iffp->iff_type != 'O')
903 continue;
904 if (rrt->rrt_info.rip6_plen < iffp->iff_plen)
905 continue;
906 ia = rrt->rrt_info.rip6_dest;
907 applyplen(&ia, iffp->iff_plen);
908 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
909 ok = 1;
910 break;
911 }
912 }
913 if (!ok)
914 return 0;
915 }
916
917 /* the prefix should be advertised */
918 return 1;
919 }
920
921 /*
922 * Determine if the route is to be advertised on the specified interface.
923 * It checks options specified in the arguments and the split horizon rule.
924 */
925 int
926 tobeadv(struct riprt *rrt, struct ifc *ifcp)
927 {
928
929 /* Special care for static routes */
930 if (rrt->rrt_flags & RTF_STATIC) {
931 /* XXX don't advertise reject/blackhole routes */
932 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE))
933 return 0;
934
935 if (Sflag) /* Yes, advertise it anyway */
936 return 1;
937 if (sflag && rrt->rrt_index != ifcp->ifc_index)
938 return 1;
939 return 0;
940 }
941 /* Regular split horizon */
942 if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index)
943 return 0;
944 return 1;
945 }
946
947 /*
948 * Send a rip packet actually.
949 */
950 int
951 sendpacket(struct sockaddr_in6 *sin6, int len)
952 {
953 struct msghdr m;
954 struct cmsghdr *cm;
955 struct iovec iov[2];
956 u_char cmsgbuf[256];
957 struct in6_pktinfo *pi;
958 int idx;
959 struct sockaddr_in6 sincopy;
960
961 /* do not overwrite the given sin */
962 sincopy = *sin6;
963 sin6 = &sincopy;
964
965 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
966 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
967 /* XXX: do not mix the interface index and link index */
968 idx = IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr);
969 SET_IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr, 0);
970 sin6->sin6_scope_id = idx;
971 } else
972 idx = 0;
973
974 m.msg_name = (caddr_t)sin6;
975 m.msg_namelen = sizeof(*sin6);
976 iov[0].iov_base = (caddr_t)ripbuf;
977 iov[0].iov_len = len;
978 m.msg_iov = iov;
979 m.msg_iovlen = 1;
980 if (!idx) {
981 m.msg_control = NULL;
982 m.msg_controllen = 0;
983 } else {
984 memset(cmsgbuf, 0, sizeof(cmsgbuf));
985 cm = (struct cmsghdr *)cmsgbuf;
986 m.msg_control = (caddr_t)cm;
987 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
988
989 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
990 cm->cmsg_level = IPPROTO_IPV6;
991 cm->cmsg_type = IPV6_PKTINFO;
992 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
993 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/
994 pi->ipi6_ifindex = idx;
995 }
996
997 if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) {
998 trace(1, "sendmsg: %s\n", strerror(errno));
999 return errno;
1000 }
1001
1002 return 0;
1003 }
1004
1005 /*
1006 * Receive and process RIP packets. Update the routes/kernel forwarding
1007 * table if necessary.
1008 */
1009 void
1010 riprecv(void)
1011 {
1012 struct ifc *ifcp, *ic;
1013 struct sockaddr_in6 fsock;
1014 struct in6_addr nh; /* next hop */
1015 struct rip6 *rp;
1016 struct netinfo6 *np, *nq;
1017 struct riprt *rrt;
1018 ssize_t len, nn;
1019 unsigned int need_trigger, idx;
1020 char buf[4 * RIP6_MAXMTU];
1021 time_t t;
1022 struct msghdr m;
1023 struct cmsghdr *cm;
1024 struct iovec iov[2];
1025 u_char cmsgbuf[256];
1026 struct in6_pktinfo *pi;
1027 struct iff *iffp;
1028 struct in6_addr ia;
1029 int ok;
1030 time_t t_half_lifetime;
1031
1032 need_trigger = 0;
1033
1034 m.msg_name = (caddr_t)&fsock;
1035 m.msg_namelen = sizeof(fsock);
1036 iov[0].iov_base = (caddr_t)buf;
1037 iov[0].iov_len = sizeof(buf);
1038 m.msg_iov = iov;
1039 m.msg_iovlen = 1;
1040 cm = (struct cmsghdr *)cmsgbuf;
1041 m.msg_control = (caddr_t)cm;
1042 m.msg_controllen = sizeof(cmsgbuf);
1043 if ((len = recvmsg(ripsock, &m, 0)) < 0) {
1044 fatal("recvmsg");
1045 /*NOTREACHED*/
1046 }
1047 idx = 0;
1048 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
1049 cm;
1050 cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
1051 if (cm->cmsg_level == IPPROTO_IPV6 &&
1052 cm->cmsg_type == IPV6_PKTINFO) {
1053 pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
1054 idx = pi->ipi6_ifindex;
1055 break;
1056 }
1057 }
1058 if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr))
1059 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx);
1060
1061 if (len < (int)sizeof(struct rip6)) {
1062 trace(1, "Packet too short\n");
1063 return;
1064 }
1065
1066 nh = fsock.sin6_addr;
1067 nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) /
1068 sizeof(struct netinfo6);
1069 rp = (struct rip6 *)buf;
1070 np = rp->rip6_nets;
1071
1072 if (rp->rip6_vers != RIP6_VERSION) {
1073 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers);
1074 return;
1075 }
1076 if (rp->rip6_cmd == RIP6_REQUEST) {
1077 if (idx && idx < (unsigned)nindex2ifc) {
1078 ifcp = index2ifc[idx];
1079 riprequest(ifcp, np, nn, &fsock);
1080 } else {
1081 riprequest(NULL, np, nn, &fsock);
1082 }
1083 return;
1084 }
1085
1086 if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) {
1087 trace(1, "Packets from non-ll addr: %s\n",
1088 inet6_n2p(&fsock.sin6_addr));
1089 return; /* Ignore packets from non-link-local addr */
1090 }
1091 idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr);
1092 ifcp = (idx < (unsigned)nindex2ifc) ? index2ifc[idx] : NULL;
1093 if (!ifcp) {
1094 trace(1, "Packets to unknown interface index %d\n", idx);
1095 return; /* Ignore it */
1096 }
1097 if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr))
1098 return; /* The packet is from me; ignore */
1099 if (rp->rip6_cmd != RIP6_RESPONSE) {
1100 trace(1, "Invalid command %d\n", rp->rip6_cmd);
1101 return;
1102 }
1103
1104 /* -N: no use */
1105 if (iff_find(ifcp, 'N') != NULL)
1106 return;
1107
1108 tracet(1, "Recv(%s): from %s.%d info(%d)\n",
1109 ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), (int)nn);
1110
1111 t = time(NULL);
1112 t_half_lifetime = t - (RIP_LIFETIME/2);
1113 for (; nn; nn--, np++) {
1114 if (np->rip6_metric == NEXTHOP_METRIC) {
1115 /* modify neighbor address */
1116 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1117 nh = np->rip6_dest;
1118 SET_IN6_LINKLOCAL_IFINDEX(nh, idx);
1119 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1120 } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) {
1121 nh = fsock.sin6_addr;
1122 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1123 } else {
1124 nh = fsock.sin6_addr;
1125 trace(1, "\tInvalid Nexthop: %s\n",
1126 inet6_n2p(&np->rip6_dest));
1127 }
1128 continue;
1129 }
1130 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) {
1131 trace(1, "\tMulticast netinfo6: %s/%d [%d]\n",
1132 inet6_n2p(&np->rip6_dest),
1133 np->rip6_plen, np->rip6_metric);
1134 continue;
1135 }
1136 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) {
1137 trace(1, "\tLoopback netinfo6: %s/%d [%d]\n",
1138 inet6_n2p(&np->rip6_dest),
1139 np->rip6_plen, np->rip6_metric);
1140 continue;
1141 }
1142 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1143 trace(1, "\tLink Local netinfo6: %s/%d [%d]\n",
1144 inet6_n2p(&np->rip6_dest),
1145 np->rip6_plen, np->rip6_metric);
1146 continue;
1147 }
1148 /* may need to pass sitelocal prefix in some case, however*/
1149 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) {
1150 trace(1, "\tSite Local netinfo6: %s/%d [%d]\n",
1151 inet6_n2p(&np->rip6_dest),
1152 np->rip6_plen, np->rip6_metric);
1153 continue;
1154 }
1155 trace(2, "\tnetinfo6: %s/%d [%d]",
1156 inet6_n2p(&np->rip6_dest),
1157 np->rip6_plen, np->rip6_metric);
1158 if (np->rip6_tag)
1159 trace(2, " tag=0x%04x", ntohs(np->rip6_tag) & 0xffff);
1160 if (dflag >= 2) {
1161 ia = np->rip6_dest;
1162 applyplen(&ia, np->rip6_plen);
1163 if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest))
1164 trace(2, " [junk outside prefix]");
1165 }
1166
1167 /*
1168 * -L: listen only if the prefix matches the configuration
1169 */
1170 ok = 1; /* if there's no L filter, it is ok */
1171 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
1172 if (iffp->iff_type != 'L')
1173 continue;
1174 ok = 0;
1175 if (np->rip6_plen < iffp->iff_plen)
1176 continue;
1177 /* special rule: ::/0 means default, not "in /0" */
1178 if (iffp->iff_plen == 0 && np->rip6_plen > 0)
1179 continue;
1180 ia = np->rip6_dest;
1181 applyplen(&ia, iffp->iff_plen);
1182 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
1183 ok = 1;
1184 break;
1185 }
1186 }
1187 if (!ok) {
1188 trace(2, " (filtered)\n");
1189 continue;
1190 }
1191
1192 trace(2, "\n");
1193 np->rip6_metric++;
1194 np->rip6_metric += ifcp->ifc_metric;
1195 if (np->rip6_metric > HOPCNT_INFINITY6)
1196 np->rip6_metric = HOPCNT_INFINITY6;
1197
1198 applyplen(&np->rip6_dest, np->rip6_plen);
1199 if ((rrt = rtsearch(np, NULL)) != NULL) {
1200 if (rrt->rrt_t == 0)
1201 continue; /* Intf route has priority */
1202 nq = &rrt->rrt_info;
1203 if (nq->rip6_metric > np->rip6_metric) {
1204 if (rrt->rrt_index == ifcp->ifc_index &&
1205 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1206 /* Small metric from the same gateway */
1207 nq->rip6_metric = np->rip6_metric;
1208 } else {
1209 /* Better route found */
1210 rrt->rrt_index = ifcp->ifc_index;
1211 /* Update routing table */
1212 delroute(nq, &rrt->rrt_gw);
1213 rrt->rrt_gw = nh;
1214 *nq = *np;
1215 addroute(rrt, &nh, ifcp);
1216 }
1217 rrt->rrt_rflags |= RRTF_CHANGED;
1218 rrt->rrt_t = t;
1219 need_trigger = 1;
1220 } else if (nq->rip6_metric < np->rip6_metric &&
1221 rrt->rrt_index == ifcp->ifc_index &&
1222 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1223 /* Got worse route from same gw */
1224 nq->rip6_metric = np->rip6_metric;
1225 rrt->rrt_t = t;
1226 rrt->rrt_rflags |= RRTF_CHANGED;
1227 need_trigger = 1;
1228 } else if (nq->rip6_metric == np->rip6_metric &&
1229 np->rip6_metric < HOPCNT_INFINITY6) {
1230 if (rrt->rrt_index == ifcp->ifc_index &&
1231 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1232 /* same metric, same route from same gw */
1233 rrt->rrt_t = t;
1234 } else if (rrt->rrt_t < t_half_lifetime) {
1235 /* Better route found */
1236 rrt->rrt_index = ifcp->ifc_index;
1237 /* Update routing table */
1238 delroute(nq, &rrt->rrt_gw);
1239 rrt->rrt_gw = nh;
1240 *nq = *np;
1241 addroute(rrt, &nh, ifcp);
1242 rrt->rrt_rflags |= RRTF_CHANGED;
1243 rrt->rrt_t = t;
1244 }
1245 }
1246 /*
1247 * if nq->rip6_metric == HOPCNT_INFINITY6 then
1248 * do not update age value. Do nothing.
1249 */
1250 } else if (np->rip6_metric < HOPCNT_INFINITY6) {
1251 /* Got a new valid route */
1252 if ((rrt = MALLOC(struct riprt)) == NULL) {
1253 fatal("malloc: struct riprt");
1254 /*NOTREACHED*/
1255 }
1256 memset(rrt, 0, sizeof(*rrt));
1257 nq = &rrt->rrt_info;
1258
1259 rrt->rrt_same = NULL;
1260 rrt->rrt_index = ifcp->ifc_index;
1261 rrt->rrt_flags = RTF_UP|RTF_GATEWAY;
1262 rrt->rrt_gw = nh;
1263 *nq = *np;
1264 applyplen(&nq->rip6_dest, nq->rip6_plen);
1265 if (nq->rip6_plen == sizeof(struct in6_addr) * 8)
1266 rrt->rrt_flags |= RTF_HOST;
1267
1268 /* Put the route to the list */
1269 rrt->rrt_next = riprt;
1270 riprt = rrt;
1271 /* Update routing table */
1272 addroute(rrt, &nh, ifcp);
1273 rrt->rrt_rflags |= RRTF_CHANGED;
1274 need_trigger = 1;
1275 rrt->rrt_t = t;
1276 }
1277 }
1278 /* XXX need to care the interval between triggered updates */
1279 if (need_trigger) {
1280 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) {
1281 for (ic = ifc; ic; ic = ic->ifc_next) {
1282 if (ifcp->ifc_index == ic->ifc_index)
1283 continue;
1284 if (ic->ifc_flags & IFF_UP)
1285 ripsend(ic, &ic->ifc_ripsin,
1286 RRTF_CHANGED);
1287 }
1288 }
1289 /* Reset the flag */
1290 for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1291 rrt->rrt_rflags &= ~RRTF_CHANGED;
1292 }
1293 }
1294
1295 /*
1296 * Send all routes request packet to the specified interface.
1297 */
1298 void
1299 sendrequest(struct ifc *ifcp)
1300 {
1301 struct netinfo6 *np;
1302 int error;
1303
1304 if (ifcp->ifc_flags & IFF_LOOPBACK)
1305 return;
1306 ripbuf->rip6_cmd = RIP6_REQUEST;
1307 np = ripbuf->rip6_nets;
1308 memset(np, 0, sizeof(struct netinfo6));
1309 np->rip6_metric = HOPCNT_INFINITY6;
1310 tracet(1, "Send rtdump Request to %s (%s)\n",
1311 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1312 error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
1313 if (error == EAFNOSUPPORT) {
1314 /* Protocol not supported */
1315 tracet(1, "Could not send rtdump Request to %s (%s): "
1316 "set IFF_UP to 0\n",
1317 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1318 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */
1319 }
1320 ripbuf->rip6_cmd = RIP6_RESPONSE;
1321 }
1322
1323 /*
1324 * Process a RIP6_REQUEST packet.
1325 */
1326 void
1327 riprequest(struct ifc *ifcp, struct netinfo6 *np, int nn,
1328 struct sockaddr_in6 *sin6)
1329 {
1330 int i;
1331 struct riprt *rrt;
1332
1333 if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) &&
1334 np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) {
1335 /* Specific response, don't split-horizon */
1336 trace(1, "\tRIP Request\n");
1337 for (i = 0; i < nn; i++, np++) {
1338 rrt = rtsearch(np, NULL);
1339 if (rrt)
1340 np->rip6_metric = rrt->rrt_info.rip6_metric;
1341 else
1342 np->rip6_metric = HOPCNT_INFINITY6;
1343 }
1344 (void)sendpacket(sin6, RIPSIZE(nn));
1345 return;
1346 }
1347 /* Whole routing table dump */
1348 trace(1, "\tRIP Request -- whole routing table\n");
1349 ripsend(ifcp, sin6, RRTF_SENDANYWAY);
1350 }
1351
1352 /*
1353 * Get information of each interface.
1354 */
1355 void
1356 ifconfig(void)
1357 {
1358 struct ifaddrs *ifap, *ifa;
1359 struct ifc *ifcp;
1360 struct ipv6_mreq mreq;
1361 int s;
1362
1363 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
1364 fatal("socket");
1365 /*NOTREACHED*/
1366 }
1367
1368 if (getifaddrs(&ifap) != 0) {
1369 fatal("getifaddrs");
1370 /*NOTREACHED*/
1371 }
1372
1373 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1374 if (ifa->ifa_addr->sa_family != AF_INET6)
1375 continue;
1376 ifcp = ifc_find(ifa->ifa_name);
1377 /* we are interested in multicast-capable interfaces */
1378 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
1379 continue;
1380 if (!ifcp) {
1381 /* new interface */
1382 if ((ifcp = MALLOC(struct ifc)) == NULL) {
1383 fatal("malloc: struct ifc");
1384 /*NOTREACHED*/
1385 }
1386 memset(ifcp, 0, sizeof(*ifcp));
1387 ifcp->ifc_index = -1;
1388 ifcp->ifc_next = ifc;
1389 ifc = ifcp;
1390 nifc++;
1391 ifcp->ifc_name = allocopy(ifa->ifa_name);
1392 ifcp->ifc_addr = 0;
1393 ifcp->ifc_filter = 0;
1394 ifcp->ifc_flags = ifa->ifa_flags;
1395 trace(1, "newif %s <%s>\n", ifcp->ifc_name,
1396 ifflags(ifcp->ifc_flags));
1397 if (!strcmp(ifcp->ifc_name, LOOPBACK_IF))
1398 loopifcp = ifcp;
1399 } else {
1400 /* update flag, this may be up again */
1401 if (ifcp->ifc_flags != ifa->ifa_flags) {
1402 trace(1, "%s: <%s> -> ", ifcp->ifc_name,
1403 ifflags(ifcp->ifc_flags));
1404 trace(1, "<%s>\n", ifflags(ifa->ifa_flags));
1405 ifcp->ifc_cflags |= IFC_CHANGED;
1406 }
1407 ifcp->ifc_flags = ifa->ifa_flags;
1408 }
1409 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s);
1410 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP
1411 && 0 < ifcp->ifc_index && !ifcp->ifc_joined) {
1412 mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr;
1413 mreq.ipv6mr_interface = ifcp->ifc_index;
1414 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1415 &mreq, sizeof(mreq)) < 0) {
1416 fatal("IPV6_JOIN_GROUP");
1417 /*NOTREACHED*/
1418 }
1419 trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST);
1420 ifcp->ifc_joined++;
1421 }
1422 }
1423 close(s);
1424 freeifaddrs(ifap);
1425 }
1426
1427 void
1428 ifconfig1(const char *name, const struct sockaddr *sa, struct ifc *ifcp, int s)
1429 {
1430 struct in6_ifreq ifr;
1431 const struct sockaddr_in6 *sin6;
1432 struct ifac *ifa;
1433 int plen;
1434 char buf[BUFSIZ];
1435
1436 sin6 = (const struct sockaddr_in6 *)sa;
1437 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) && !lflag)
1438 return;
1439 ifr.ifr_addr = *sin6;
1440 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1441 if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) {
1442 fatal("ioctl: SIOCGIFNETMASK_IN6");
1443 /*NOTREACHED*/
1444 }
1445 plen = sin6mask2len(&ifr.ifr_addr);
1446 if ((ifa = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) {
1447 /* same interface found */
1448 /* need check if something changed */
1449 /* XXX not yet implemented */
1450 return;
1451 }
1452 /*
1453 * New address is found
1454 */
1455 if ((ifa = MALLOC(struct ifac)) == NULL) {
1456 fatal("malloc: struct ifac");
1457 /*NOTREACHED*/
1458 }
1459 memset(ifa, 0, sizeof(*ifa));
1460 ifa->ifa_conf = ifcp;
1461 ifa->ifa_next = ifcp->ifc_addr;
1462 ifcp->ifc_addr = ifa;
1463 ifa->ifa_addr = sin6->sin6_addr;
1464 ifa->ifa_plen = plen;
1465 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1466 ifr.ifr_addr = *sin6;
1467 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) {
1468 fatal("ioctl: SIOCGIFDSTADDR_IN6");
1469 /*NOTREACHED*/
1470 }
1471 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr;
1472 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf));
1473 trace(1, "found address %s/%d -- %s\n",
1474 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf);
1475 } else {
1476 trace(1, "found address %s/%d\n",
1477 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen);
1478 }
1479 if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1480 ifcp->ifc_mylladdr = ifa->ifa_addr;
1481 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr);
1482 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len);
1483 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr,
1484 ifcp->ifc_index);
1485 setindex2ifc(ifcp->ifc_index, ifcp);
1486 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index);
1487 if (ifcp->ifc_mtu > RIP6_MAXMTU)
1488 ifcp->ifc_mtu = RIP6_MAXMTU;
1489 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) {
1490 fatal("ioctl: SIOCGIFMETRIC");
1491 /*NOTREACHED*/
1492 }
1493 ifcp->ifc_metric = ifr.ifr_metric;
1494 trace(1, "\tindex: %d, mtu: %d, metric: %d\n",
1495 ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric);
1496 } else
1497 ifcp->ifc_cflags |= IFC_CHANGED;
1498 }
1499
1500 /*
1501 * Receive and process routing messages.
1502 * Update interface information as necessary.
1503 */
1504 void
1505 rtrecv(void)
1506 {
1507 char buf[BUFSIZ];
1508 char *p, *q;
1509 struct rt_msghdr *rtm;
1510 struct ifa_msghdr *ifam;
1511 struct if_msghdr *ifm;
1512 int len;
1513 struct ifc *ifcp, *ic;
1514 int iface = 0, rtable = 0;
1515 struct sockaddr_in6 *rta[RTAX_MAX];
1516 struct sockaddr_in6 mask;
1517 int i, addrs;
1518 struct riprt *rrt;
1519
1520 if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
1521 perror("read from rtsock");
1522 exit(1);
1523 }
1524 if (len < (int)sizeof(*rtm)) {
1525 trace(1, "short read from rtsock: %d (should be > %lu)\n",
1526 len, (u_long)sizeof(*rtm));
1527 return;
1528 }
1529 if (dflag >= 2) {
1530 fprintf(stderr, "rtmsg:\n");
1531 for (i = 0; i < len; i++) {
1532 fprintf(stderr, "%02x ", buf[i] & 0xff);
1533 if (i % 16 == 15) fprintf(stderr, "\n");
1534 }
1535 fprintf(stderr, "\n");
1536 }
1537
1538 for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) {
1539 /* safety against bogus message */
1540 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) {
1541 trace(1, "bogus rtmsg: length=%d\n",
1542 ((struct rt_msghdr *)p)->rtm_msglen);
1543 break;
1544 }
1545 rtm = NULL;
1546 ifam = NULL;
1547 ifm = NULL;
1548 switch (((struct rt_msghdr *)p)->rtm_type) {
1549 case RTM_NEWADDR:
1550 case RTM_DELADDR:
1551 ifam = (struct ifa_msghdr *)p;
1552 addrs = ifam->ifam_addrs;
1553 q = (char *)(ifam + 1);
1554 break;
1555 case RTM_IFINFO:
1556 ifm = (struct if_msghdr *)p;
1557 addrs = ifm->ifm_addrs;
1558 q = (char *)(ifm + 1);
1559 break;
1560 default:
1561 rtm = (struct rt_msghdr *)p;
1562 addrs = rtm->rtm_addrs;
1563 q = (char *)(rtm + 1);
1564 if (rtm->rtm_version != RTM_VERSION) {
1565 trace(1, "unexpected rtmsg version %d "
1566 "(should be %d)\n",
1567 rtm->rtm_version, RTM_VERSION);
1568 continue;
1569 }
1570 if (rtm->rtm_pid == pid) {
1571 #if 0
1572 trace(1, "rtmsg looped back to me, ignored\n");
1573 #endif
1574 continue;
1575 }
1576 break;
1577 }
1578 memset(&rta, 0, sizeof(rta));
1579 for (i = 0; i < RTAX_MAX; i++) {
1580 if (addrs & (1 << i)) {
1581 rta[i] = (struct sockaddr_in6 *)q;
1582 q += ROUNDUP(rta[i]->sin6_len);
1583 }
1584 }
1585
1586 trace(1, "rtsock: %s (addrs=%x)\n",
1587 rttypes((struct rt_msghdr *)p), addrs);
1588 if (dflag >= 2) {
1589 for (i = 0;
1590 i < ((struct rt_msghdr *)p)->rtm_msglen;
1591 i++) {
1592 fprintf(stderr, "%02x ", p[i] & 0xff);
1593 if (i % 16 == 15) fprintf(stderr, "\n");
1594 }
1595 fprintf(stderr, "\n");
1596 }
1597
1598 /*
1599 * Easy ones first.
1600 *
1601 * We may be able to optimize by using ifm->ifm_index or
1602 * ifam->ifam_index. For simplicity we don't do that here.
1603 */
1604 switch (((struct rt_msghdr *)p)->rtm_type) {
1605 case RTM_NEWADDR:
1606 case RTM_IFINFO:
1607 iface++;
1608 continue;
1609 case RTM_ADD:
1610 rtable++;
1611 continue;
1612 case RTM_LOSING:
1613 case RTM_MISS:
1614 case RTM_RESOLVE:
1615 case RTM_GET:
1616 case RTM_LOCK:
1617 /* nothing to be done here */
1618 trace(1, "\tnothing to be done, ignored\n");
1619 continue;
1620 }
1621
1622 #if 0
1623 if (rta[RTAX_DST] == NULL) {
1624 trace(1, "\tno destination, ignored\n");
1625 continue;
1626 }
1627 if (rta[RTAX_DST]->sin6_family != AF_INET6) {
1628 trace(1, "\taf mismatch, ignored\n");
1629 continue;
1630 }
1631 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) {
1632 trace(1, "\tlinklocal destination, ignored\n");
1633 continue;
1634 }
1635 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) {
1636 trace(1, "\tloopback destination, ignored\n");
1637 continue; /* Loopback */
1638 }
1639 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) {
1640 trace(1, "\tmulticast destination, ignored\n");
1641 continue;
1642 }
1643 #endif
1644
1645 /* hard ones */
1646 switch (((struct rt_msghdr *)p)->rtm_type) {
1647 case RTM_NEWADDR:
1648 case RTM_IFINFO:
1649 case RTM_ADD:
1650 case RTM_LOSING:
1651 case RTM_MISS:
1652 case RTM_RESOLVE:
1653 case RTM_GET:
1654 case RTM_LOCK:
1655 /* should already be handled */
1656 fatal("rtrecv: never reach here");
1657 /*NOTREACHED*/
1658 case RTM_DELETE:
1659 if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) {
1660 trace(1, "\tsome of dst/gw/netamsk are "
1661 "unavailable, ignored\n");
1662 break;
1663 }
1664 if ((rtm->rtm_flags & RTF_HOST) != 0) {
1665 mask.sin6_len = sizeof(mask);
1666 memset(&mask.sin6_addr, 0xff,
1667 sizeof(mask.sin6_addr));
1668 rta[RTAX_NETMASK] = &mask;
1669 } else if (!rta[RTAX_NETMASK]) {
1670 trace(1, "\tsome of dst/gw/netamsk are "
1671 "unavailable, ignored\n");
1672 break;
1673 }
1674 if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY],
1675 rta[RTAX_NETMASK]) == 0) {
1676 rtable++; /*just to be sure*/
1677 }
1678 break;
1679 case RTM_CHANGE:
1680 case RTM_REDIRECT:
1681 trace(1, "\tnot supported yet, ignored\n");
1682 break;
1683 case RTM_DELADDR:
1684 if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) {
1685 trace(1, "\tno netmask or ifa given, ignored\n");
1686 break;
1687 }
1688 if (ifam->ifam_index < nindex2ifc)
1689 ifcp = index2ifc[ifam->ifam_index];
1690 else
1691 ifcp = NULL;
1692 if (!ifcp) {
1693 trace(1, "\tinvalid ifam_index %d, ignored\n",
1694 ifam->ifam_index);
1695 break;
1696 }
1697 if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK]))
1698 iface++;
1699 break;
1700 case RTM_OLDADD:
1701 case RTM_OLDDEL:
1702 trace(1, "\tnot supported yet, ignored\n");
1703 break;
1704 }
1705
1706 }
1707
1708 if (iface) {
1709 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n");
1710 ifconfig();
1711 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
1712 if (ifcp->ifc_cflags & IFC_CHANGED) {
1713 if (ifrt(ifcp, 1)) {
1714 for (ic = ifc; ic; ic = ic->ifc_next) {
1715 if (ifcp->ifc_index == ic->ifc_index)
1716 continue;
1717 if (ic->ifc_flags & IFF_UP)
1718 ripsend(ic, &ic->ifc_ripsin,
1719 RRTF_CHANGED);
1720 }
1721 /* Reset the flag */
1722 for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1723 rrt->rrt_rflags &= ~RRTF_CHANGED;
1724 }
1725 ifcp->ifc_cflags &= ~IFC_CHANGED;
1726 }
1727 }
1728 if (rtable) {
1729 trace(1, "rtsock: read routing table again\n");
1730 krtread(1);
1731 }
1732 }
1733
1734 /*
1735 * remove specified route from the internal routing table.
1736 */
1737 int
1738 rt_del(const struct sockaddr_in6 *sdst, const struct sockaddr_in6 *sgw,
1739 const struct sockaddr_in6 *smask)
1740 {
1741 const struct in6_addr *dst = NULL;
1742 const struct in6_addr *gw = NULL;
1743 int prefix;
1744 struct netinfo6 ni6;
1745 struct riprt *rrt = NULL;
1746 time_t t_lifetime;
1747
1748 if (sdst->sin6_family != AF_INET6) {
1749 trace(1, "\tother AF, ignored\n");
1750 return -1;
1751 }
1752 if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr)
1753 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback)
1754 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) {
1755 trace(1, "\taddress %s not interesting, ignored\n",
1756 inet6_n2p(&sdst->sin6_addr));
1757 return -1;
1758 }
1759 dst = &sdst->sin6_addr;
1760 if (sgw->sin6_family == AF_INET6) {
1761 /* easy case */
1762 gw = &sgw->sin6_addr;
1763 prefix = sin6mask2len(smask);
1764 } else if (sgw->sin6_family == AF_LINK) {
1765 /*
1766 * Interface route... a hard case. We need to get the prefix
1767 * length from the kernel, but we now are parsing rtmsg.
1768 * We'll purge matching routes from my list, then get the
1769 * fresh list.
1770 */
1771 struct riprt *longest;
1772 trace(1, "\t%s is an interface route, guessing prefixlen\n",
1773 inet6_n2p(dst));
1774 longest = NULL;
1775 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
1776 if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
1777 &sdst->sin6_addr)
1778 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
1779 if (!longest
1780 || longest->rrt_info.rip6_plen <
1781 rrt->rrt_info.rip6_plen) {
1782 longest = rrt;
1783 }
1784 }
1785 }
1786 rrt = longest;
1787 if (!rrt) {
1788 trace(1, "\tno matching interface route found\n");
1789 return -1;
1790 }
1791 gw = &in6addr_loopback;
1792 prefix = rrt->rrt_info.rip6_plen;
1793 } else {
1794 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family);
1795 return -1;
1796 }
1797
1798 trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix);
1799 trace(1, "gw %s\n", inet6_n2p(gw));
1800 t_lifetime = time(NULL) - RIP_LIFETIME;
1801 /* age route for interface address */
1802 memset(&ni6, 0, sizeof(ni6));
1803 ni6.rip6_dest = *dst;
1804 ni6.rip6_plen = prefix;
1805 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/
1806 trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest),
1807 ni6.rip6_plen);
1808 if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) {
1809 trace(1, "\tno route found\n");
1810 return -1;
1811 }
1812 #if 0
1813 if ((rrt->rrt_flags & RTF_STATIC) == 0) {
1814 trace(1, "\tyou can delete static routes only\n");
1815 } else
1816 #endif
1817 if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) {
1818 trace(1, "\tgw mismatch: %s <-> ",
1819 inet6_n2p(&rrt->rrt_gw));
1820 trace(1, "%s\n", inet6_n2p(gw));
1821 } else {
1822 trace(1, "\troute found, age it\n");
1823 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1824 rrt->rrt_t = t_lifetime;
1825 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1826 }
1827 }
1828 return 0;
1829 }
1830
1831 /*
1832 * remove specified address from internal interface/routing table.
1833 */
1834 int
1835 rt_deladdr(struct ifc *ifcp, const struct sockaddr_in6 *sifa,
1836 const struct sockaddr_in6 *smask)
1837 {
1838 const struct in6_addr *addr = NULL;
1839 int prefix;
1840 struct ifac *ifa = NULL;
1841 struct netinfo6 ni6;
1842 struct riprt *rrt = NULL;
1843 time_t t_lifetime;
1844 int updated = 0;
1845
1846 if (sifa->sin6_family != AF_INET6) {
1847 trace(1, "\tother AF, ignored\n");
1848 return -1;
1849 }
1850 addr = &sifa->sin6_addr;
1851 prefix = sin6mask2len(smask);
1852
1853 trace(1, "\tdeleting %s/%d from %s\n",
1854 inet6_n2p(addr), prefix, ifcp->ifc_name);
1855 ifa = ifa_match(ifcp, addr, prefix);
1856 if (!ifa) {
1857 trace(1, "\tno matching ifa found for %s/%d on %s\n",
1858 inet6_n2p(addr), prefix, ifcp->ifc_name);
1859 return -1;
1860 }
1861 if (ifa->ifa_conf != ifcp) {
1862 trace(1, "\taddress table corrupt: back pointer does not match "
1863 "(%s != %s)\n",
1864 ifcp->ifc_name, ifa->ifa_conf->ifc_name);
1865 return -1;
1866 }
1867 /* remove ifa from interface */
1868 if (ifcp->ifc_addr == ifa)
1869 ifcp->ifc_addr = ifa->ifa_next;
1870 else {
1871 struct ifac *p;
1872 for (p = ifcp->ifc_addr; p; p = p->ifa_next) {
1873 if (p->ifa_next == ifa) {
1874 p->ifa_next = ifa->ifa_next;
1875 break;
1876 }
1877 }
1878 }
1879 ifa->ifa_next = NULL;
1880 ifa->ifa_conf = NULL;
1881 t_lifetime = time(NULL) - RIP_LIFETIME;
1882 /* age route for interface address */
1883 memset(&ni6, 0, sizeof(ni6));
1884 ni6.rip6_dest = ifa->ifa_addr;
1885 ni6.rip6_plen = ifa->ifa_plen;
1886 applyplen(&ni6.rip6_dest, ni6.rip6_plen);
1887 trace(1, "\tfind interface route %s/%d on %d\n",
1888 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index);
1889 if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1890 struct in6_addr none;
1891 memset(&none, 0, sizeof(none));
1892 if (rrt->rrt_index == ifcp->ifc_index &&
1893 (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) ||
1894 IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) {
1895 trace(1, "\troute found, age it\n");
1896 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1897 rrt->rrt_t = t_lifetime;
1898 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1899 }
1900 updated++;
1901 } else {
1902 trace(1, "\tnon-interface route found: %s/%d on %d\n",
1903 inet6_n2p(&rrt->rrt_info.rip6_dest),
1904 rrt->rrt_info.rip6_plen,
1905 rrt->rrt_index);
1906 }
1907 } else
1908 trace(1, "\tno interface route found\n");
1909 /* age route for p2p destination */
1910 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1911 memset(&ni6, 0, sizeof(ni6));
1912 ni6.rip6_dest = ifa->ifa_raddr;
1913 ni6.rip6_plen = 128;
1914 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/
1915 trace(1, "\tfind p2p route %s/%d on %d\n",
1916 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen,
1917 ifcp->ifc_index);
1918 if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1919 if (rrt->rrt_index == ifcp->ifc_index &&
1920 IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) {
1921 trace(1, "\troute found, age it\n");
1922 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1923 rrt->rrt_t = t_lifetime;
1924 rrt->rrt_info.rip6_metric =
1925 HOPCNT_INFINITY6;
1926 updated++;
1927 }
1928 } else {
1929 trace(1, "\tnon-p2p route found: %s/%d on %d\n",
1930 inet6_n2p(&rrt->rrt_info.rip6_dest),
1931 rrt->rrt_info.rip6_plen,
1932 rrt->rrt_index);
1933 }
1934 } else
1935 trace(1, "\tno p2p route found\n");
1936 }
1937 return updated ? 0 : -1;
1938 }
1939
1940 /*
1941 * Get each interface address and put those interface routes to the route
1942 * list.
1943 */
1944 int
1945 ifrt(struct ifc *ifcp, int again)
1946 {
1947 struct ifac *ifa;
1948 struct riprt *rrt = NULL, *search_rrt, *prev_rrt, *loop_rrt;
1949 struct netinfo6 *np;
1950 time_t t_lifetime;
1951 int need_trigger = 0;
1952
1953 #if 0
1954 if (ifcp->ifc_flags & IFF_LOOPBACK)
1955 return 0; /* ignore loopback */
1956 #endif
1957
1958 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1959 ifrt_p2p(ifcp, again);
1960 return 0;
1961 }
1962
1963 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
1964 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1965 #if 0
1966 trace(1, "route: %s on %s: "
1967 "skip linklocal interface address\n",
1968 inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name);
1969 #endif
1970 continue;
1971 }
1972 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) {
1973 #if 0
1974 trace(1, "route: %s: skip unspec interface address\n",
1975 ifcp->ifc_name);
1976 #endif
1977 continue;
1978 }
1979 if (IN6_IS_ADDR_LOOPBACK(&ifa->ifa_addr)) {
1980 #if 0
1981 trace(1, "route: %s: skip loopback address\n",
1982 ifcp->ifc_name);
1983 #endif
1984 continue;
1985 }
1986 if (ifcp->ifc_flags & IFF_UP) {
1987 if ((rrt = MALLOC(struct riprt)) == NULL)
1988 fatal("malloc: struct riprt");
1989 memset(rrt, 0, sizeof(*rrt));
1990 rrt->rrt_same = NULL;
1991 rrt->rrt_index = ifcp->ifc_index;
1992 rrt->rrt_t = 0; /* don't age */
1993 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
1994 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
1995 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
1996 rrt->rrt_info.rip6_plen = ifa->ifa_plen;
1997 if (ifa->ifa_plen == 128)
1998 rrt->rrt_flags = RTF_HOST;
1999 else
2000 rrt->rrt_flags = RTF_CLONING;
2001 rrt->rrt_rflags |= RRTF_CHANGED;
2002 applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen);
2003 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2004 rrt->rrt_gw = ifa->ifa_addr;
2005 np = &rrt->rrt_info;
2006 search_rrt = rtsearch(np, &prev_rrt);
2007 if (search_rrt != NULL) {
2008 if (search_rrt->rrt_info.rip6_metric <=
2009 rrt->rrt_info.rip6_metric) {
2010 /* Already have better route */
2011 if (!again) {
2012 trace(1, "route: %s/%d: "
2013 "already registered (%s)\n",
2014 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2015 ifcp->ifc_name);
2016 }
2017 goto next;
2018 }
2019
2020 if (prev_rrt)
2021 prev_rrt->rrt_next = rrt->rrt_next;
2022 else
2023 riprt = rrt->rrt_next;
2024 delroute(&rrt->rrt_info, &rrt->rrt_gw);
2025 }
2026 /* Attach the route to the list */
2027 trace(1, "route: %s/%d: register route (%s)\n",
2028 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2029 ifcp->ifc_name);
2030 rrt->rrt_next = riprt;
2031 riprt = rrt;
2032 addroute(rrt, &rrt->rrt_gw, ifcp);
2033 rrt = NULL;
2034 sendrequest(ifcp);
2035 ripsend(ifcp, &ifcp->ifc_ripsin, 0);
2036 need_trigger = 1;
2037 } else {
2038 for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) {
2039 if (loop_rrt->rrt_index == ifcp->ifc_index) {
2040 t_lifetime = time(NULL) - RIP_LIFETIME;
2041 if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) {
2042 loop_rrt->rrt_t = t_lifetime;
2043 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
2044 loop_rrt->rrt_rflags |= RRTF_CHANGED;
2045 need_trigger = 1;
2046 }
2047 }
2048 }
2049 }
2050 next:
2051 if (rrt)
2052 free(rrt);
2053 }
2054 return need_trigger;
2055 }
2056
2057 /*
2058 * there are couple of p2p interface routing models. "behavior" lets
2059 * you pick one. it looks that gated behavior fits best with BSDs,
2060 * since BSD kernels do not look at prefix length on p2p interfaces.
2061 */
2062 void
2063 ifrt_p2p(struct ifc *ifcp, int again)
2064 {
2065 struct ifac *ifa;
2066 struct riprt *rrt, *orrt, *prevrrt;
2067 struct netinfo6 *np;
2068 struct in6_addr addr, dest;
2069 int advert, ignore, i;
2070 #define P2PADVERT_NETWORK 1
2071 #define P2PADVERT_ADDR 2
2072 #define P2PADVERT_DEST 4
2073 #define P2PADVERT_MAX 4
2074 #define CISCO 0
2075 #define GATED 1
2076 #define ROUTE6D 2
2077 #define BEHAVIOR GATED
2078 const char *category = "";
2079 const char *noadv;
2080
2081 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2082 addr = ifa->ifa_addr;
2083 dest = ifa->ifa_raddr;
2084 applyplen(&addr, ifa->ifa_plen);
2085 applyplen(&dest, ifa->ifa_plen);
2086 advert = ignore = 0;
2087 #if BEHAVIOR == CISCO
2088 /*
2089 * honor addr/plen, just like normal shared medium
2090 * interface. this may cause trouble if you reuse
2091 * addr/plen on other interfaces.
2092 *
2093 * advertise addr/plen.
2094 */
2095 advert |= P2PADVERT_NETWORK;
2096 #endif
2097 #if BEHAVIOR == GATED
2098 /*
2099 * prefixlen on p2p interface is meaningless.
2100 * advertise addr/128 and dest/128.
2101 *
2102 * do not install network route to route6d routing
2103 * table (if we do, it would prevent route installation
2104 * for other p2p interface that shares addr/plen).
2105 *
2106 * XXX what should we do if dest is ::? it will not
2107 * get announced anyways (see following filter),
2108 * but we need to think.
2109 */
2110 advert |= P2PADVERT_ADDR;
2111 advert |= P2PADVERT_DEST;
2112 ignore |= P2PADVERT_NETWORK;
2113 #endif
2114 #if BEHAVIOR == ROUTE6D
2115 /*
2116 * just for testing. actually the code is redundant
2117 * given the current p2p interface address assignment
2118 * rule for kame kernel.
2119 *
2120 * intent:
2121 * A/n -> announce A/n
2122 * A B/n, A and B share prefix -> A/n (= B/n)
2123 * A B/n, do not share prefix -> A/128 and B/128
2124 * actually, A/64 and A B/128 are the only cases
2125 * permitted by the kernel:
2126 * A/64 -> A/64
2127 * A B/128 -> A/128 and B/128
2128 */
2129 if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) {
2130 if (IN6_ARE_ADDR_EQUAL(&addr, &dest))
2131 advert |= P2PADVERT_NETWORK;
2132 else {
2133 advert |= P2PADVERT_ADDR;
2134 advert |= P2PADVERT_DEST;
2135 ignore |= P2PADVERT_NETWORK;
2136 }
2137 } else
2138 advert |= P2PADVERT_NETWORK;
2139 #endif
2140
2141 for (i = 1; i <= P2PADVERT_MAX; i *= 2) {
2142 if ((ignore & i) != 0)
2143 continue;
2144 if ((rrt = MALLOC(struct riprt)) == NULL) {
2145 fatal("malloc: struct riprt");
2146 /*NOTREACHED*/
2147 }
2148 memset(rrt, 0, sizeof(*rrt));
2149 rrt->rrt_same = NULL;
2150 rrt->rrt_index = ifcp->ifc_index;
2151 rrt->rrt_t = 0; /* don't age */
2152 switch (i) {
2153 case P2PADVERT_NETWORK:
2154 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2155 rrt->rrt_info.rip6_plen = ifa->ifa_plen;
2156 applyplen(&rrt->rrt_info.rip6_dest,
2157 ifa->ifa_plen);
2158 category = "network";
2159 break;
2160 case P2PADVERT_ADDR:
2161 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2162 rrt->rrt_info.rip6_plen = 128;
2163 rrt->rrt_gw = in6addr_loopback;
2164 category = "addr";
2165 break;
2166 case P2PADVERT_DEST:
2167 rrt->rrt_info.rip6_dest = ifa->ifa_raddr;
2168 rrt->rrt_info.rip6_plen = 128;
2169 rrt->rrt_gw = ifa->ifa_addr;
2170 category = "dest";
2171 break;
2172 }
2173 if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) ||
2174 IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) {
2175 #if 0
2176 trace(1, "route: %s: skip unspec/linklocal "
2177 "(%s on %s)\n", category, ifcp->ifc_name);
2178 #endif
2179 free(rrt);
2180 continue;
2181 }
2182 if ((advert & i) == 0) {
2183 rrt->rrt_rflags |= RRTF_NOADVERTISE;
2184 noadv = ", NO-ADV";
2185 } else
2186 noadv = "";
2187 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2188 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
2189 np = &rrt->rrt_info;
2190 orrt = rtsearch(np, &prevrrt);
2191 if (!orrt) {
2192 /* Attach the route to the list */
2193 trace(1, "route: %s/%d: register route "
2194 "(%s on %s%s)\n",
2195 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2196 category, ifcp->ifc_name, noadv);
2197 rrt->rrt_next = riprt;
2198 riprt = rrt;
2199 } else if (rrt->rrt_index != orrt->rrt_index ||
2200 rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) {
2201 /* swap route */
2202 rrt->rrt_next = orrt->rrt_next;
2203 if (prevrrt)
2204 prevrrt->rrt_next = rrt;
2205 else
2206 riprt = rrt;
2207 free(orrt);
2208
2209 trace(1, "route: %s/%d: update (%s on %s%s)\n",
2210 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2211 category, ifcp->ifc_name, noadv);
2212 } else {
2213 /* Already found */
2214 if (!again) {
2215 trace(1, "route: %s/%d: "
2216 "already registered (%s on %s%s)\n",
2217 inet6_n2p(&np->rip6_dest),
2218 np->rip6_plen, category,
2219 ifcp->ifc_name, noadv);
2220 }
2221 free(rrt);
2222 }
2223 }
2224 }
2225 #undef P2PADVERT_NETWORK
2226 #undef P2PADVERT_ADDR
2227 #undef P2PADVERT_DEST
2228 #undef P2PADVERT_MAX
2229 }
2230
2231 int
2232 getifmtu(int ifindex)
2233 {
2234 int mib[6];
2235 char *buf;
2236 size_t msize;
2237 struct if_msghdr *ifm;
2238 int mtu;
2239
2240 mib[0] = CTL_NET;
2241 mib[1] = PF_ROUTE;
2242 mib[2] = 0;
2243 mib[3] = AF_INET6;
2244 mib[4] = NET_RT_IFLIST;
2245 mib[5] = ifindex;
2246 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2247 fatal("sysctl estimate NET_RT_IFLIST");
2248 /*NOTREACHED*/
2249 }
2250 if ((buf = malloc(msize)) == NULL) {
2251 fatal("malloc");
2252 /*NOTREACHED*/
2253 }
2254 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2255 fatal("sysctl NET_RT_IFLIST");
2256 /*NOTREACHED*/
2257 }
2258 ifm = (struct if_msghdr *)buf;
2259 mtu = ifm->ifm_data.ifi_mtu;
2260 #ifdef __FreeBSD__
2261 if (ifindex != ifm->ifm_index) {
2262 fatal("ifindex does not match with ifm_index");
2263 /*NOTREACHED*/
2264 }
2265 #endif
2266 free(buf);
2267 return mtu;
2268 }
2269
2270 const char *
2271 rttypes(struct rt_msghdr *rtm)
2272 {
2273 #define RTTYPE(s, f) \
2274 do { \
2275 if (rtm->rtm_type == (f)) \
2276 return (s); \
2277 } while (0)
2278 RTTYPE("ADD", RTM_ADD);
2279 RTTYPE("DELETE", RTM_DELETE);
2280 RTTYPE("CHANGE", RTM_CHANGE);
2281 RTTYPE("GET", RTM_GET);
2282 RTTYPE("LOSING", RTM_LOSING);
2283 RTTYPE("REDIRECT", RTM_REDIRECT);
2284 RTTYPE("MISS", RTM_MISS);
2285 RTTYPE("LOCK", RTM_LOCK);
2286 RTTYPE("OLDADD", RTM_OLDADD);
2287 RTTYPE("OLDDEL", RTM_OLDDEL);
2288 RTTYPE("RESOLVE", RTM_RESOLVE);
2289 RTTYPE("NEWADDR", RTM_NEWADDR);
2290 RTTYPE("DELADDR", RTM_DELADDR);
2291 RTTYPE("IFINFO", RTM_IFINFO);
2292 #ifdef RTM_OLDADD
2293 RTTYPE("OLDADD", RTM_OLDADD);
2294 #endif
2295 #ifdef RTM_OLDDEL
2296 RTTYPE("OLDDEL", RTM_OLDDEL);
2297 #endif
2298 #ifdef RTM_OIFINFO
2299 RTTYPE("OIFINFO", RTM_OIFINFO);
2300 #endif
2301 #ifdef RTM_IFANNOUNCE
2302 RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE);
2303 #endif
2304 #ifdef RTM_NEWMADDR
2305 RTTYPE("NEWMADDR", RTM_NEWMADDR);
2306 #endif
2307 #ifdef RTM_DELMADDR
2308 RTTYPE("DELMADDR", RTM_DELMADDR);
2309 #endif
2310 #undef RTTYPE
2311 return NULL;
2312 }
2313
2314 const char *
2315 rtflags(struct rt_msghdr *rtm)
2316 {
2317 static char buf[BUFSIZ];
2318
2319 /*
2320 * letter conflict should be okay. painful when *BSD diverges...
2321 */
2322 strlcpy(buf, "", sizeof(buf));
2323 #define RTFLAG(s, f) \
2324 do { \
2325 if (rtm->rtm_flags & (f)) \
2326 strlcat(buf, (s), sizeof(buf)); \
2327 } while (0)
2328 RTFLAG("U", RTF_UP);
2329 RTFLAG("G", RTF_GATEWAY);
2330 RTFLAG("H", RTF_HOST);
2331 RTFLAG("R", RTF_REJECT);
2332 RTFLAG("D", RTF_DYNAMIC);
2333 RTFLAG("M", RTF_MODIFIED);
2334 RTFLAG("d", RTF_DONE);
2335 #ifdef RTF_MASK
2336 RTFLAG("m", RTF_MASK);
2337 #endif
2338 RTFLAG("C", RTF_CLONING);
2339 #ifdef RTF_CLONED
2340 RTFLAG("c", RTF_CLONED);
2341 #endif
2342 #ifdef RTF_PRCLONING
2343 RTFLAG("c", RTF_PRCLONING);
2344 #endif
2345 #ifdef RTF_WASCLONED
2346 RTFLAG("W", RTF_WASCLONED);
2347 #endif
2348 RTFLAG("X", RTF_XRESOLVE);
2349 RTFLAG("L", RTF_LLINFO);
2350 RTFLAG("S", RTF_STATIC);
2351 RTFLAG("B", RTF_BLACKHOLE);
2352 #ifdef RTF_PROTO3
2353 RTFLAG("3", RTF_PROTO3);
2354 #endif
2355 RTFLAG("2", RTF_PROTO2);
2356 RTFLAG("1", RTF_PROTO1);
2357 #ifdef RTF_BROADCAST
2358 RTFLAG("b", RTF_BROADCAST);
2359 #endif
2360 #ifdef RTF_DEFAULT
2361 RTFLAG("d", RTF_DEFAULT);
2362 #endif
2363 #ifdef RTF_ISAROUTER
2364 RTFLAG("r", RTF_ISAROUTER);
2365 #endif
2366 #ifdef RTF_TUNNEL
2367 RTFLAG("T", RTF_TUNNEL);
2368 #endif
2369 #ifdef RTF_AUTH
2370 RTFLAG("A", RTF_AUTH);
2371 #endif
2372 #ifdef RTF_CRYPT
2373 RTFLAG("E", RTF_CRYPT);
2374 #endif
2375 #undef RTFLAG
2376 return buf;
2377 }
2378
2379 const char *
2380 ifflags(int flags)
2381 {
2382 static char buf[BUFSIZ];
2383
2384 strlcpy(buf, "", sizeof(buf));
2385 #define IFFLAG(s, f) \
2386 do { \
2387 if (flags & (f)) { \
2388 if (buf[0]) \
2389 strlcat(buf, ",", sizeof(buf)); \
2390 strlcat(buf, (s), sizeof(buf)); \
2391 } \
2392 } while (0)
2393 IFFLAG("UP", IFF_UP);
2394 IFFLAG("BROADCAST", IFF_BROADCAST);
2395 IFFLAG("DEBUG", IFF_DEBUG);
2396 IFFLAG("LOOPBACK", IFF_LOOPBACK);
2397 IFFLAG("POINTOPOINT", IFF_POINTOPOINT);
2398 #ifdef IFF_NOTRAILERS
2399 IFFLAG("NOTRAILERS", IFF_NOTRAILERS);
2400 #endif
2401 #ifdef IFF_SMART
2402 IFFLAG("SMART", IFF_SMART);
2403 #endif
2404 IFFLAG("RUNNING", IFF_RUNNING);
2405 IFFLAG("NOARP", IFF_NOARP);
2406 IFFLAG("PROMISC", IFF_PROMISC);
2407 IFFLAG("ALLMULTI", IFF_ALLMULTI);
2408 IFFLAG("OACTIVE", IFF_OACTIVE);
2409 IFFLAG("SIMPLEX", IFF_SIMPLEX);
2410 IFFLAG("LINK0", IFF_LINK0);
2411 IFFLAG("LINK1", IFF_LINK1);
2412 IFFLAG("LINK2", IFF_LINK2);
2413 IFFLAG("MULTICAST", IFF_MULTICAST);
2414 #undef IFFLAG
2415 return buf;
2416 }
2417
2418 void
2419 krtread(int again)
2420 {
2421 int mib[6];
2422 size_t msize;
2423 char *buf = NULL, *p, *lim;
2424 struct rt_msghdr *rtm;
2425 int retry;
2426 const char *errmsg;
2427
2428 retry = 0;
2429 buf = NULL;
2430 mib[0] = CTL_NET;
2431 mib[1] = PF_ROUTE;
2432 mib[2] = 0;
2433 mib[3] = AF_INET6; /* Address family */
2434 mib[4] = NET_RT_DUMP; /* Dump the kernel routing table */
2435 mib[5] = 0; /* No flags */
2436 do {
2437 retry++;
2438 errmsg = NULL;
2439 if (buf) {
2440 free(buf);
2441 buf = NULL;
2442 }
2443 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2444 errmsg = "sysctl estimate";
2445 continue;
2446 }
2447 if ((buf = malloc(msize)) == NULL) {
2448 errmsg = "malloc";
2449 continue;
2450 }
2451 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2452 errmsg = "sysctl NET_RT_DUMP";
2453 continue;
2454 }
2455 } while (retry < 5 && errmsg != NULL);
2456 if (errmsg) {
2457 fatal("%s (with %d retries, msize=%lu)", errmsg, retry,
2458 (u_long)msize);
2459 /*NOTREACHED*/
2460 } else if (1 < retry)
2461 syslog(LOG_INFO, "NET_RT_DUMP %d retries", retry);
2462
2463 lim = buf + msize;
2464 for (p = buf; p < lim; p += rtm->rtm_msglen) {
2465 rtm = (struct rt_msghdr *)p;
2466 rt_entry(rtm, again);
2467 }
2468 free(buf);
2469 }
2470
2471 void
2472 rt_entry(struct rt_msghdr *rtm, int again)
2473 {
2474 struct sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask;
2475 struct sockaddr_in6 *sin6_genmask, *sin6_ifp;
2476 char *rtmp, *ifname = NULL;
2477 struct riprt *rrt, *orrt;
2478 struct netinfo6 *np;
2479 int s;
2480
2481 sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0;
2482 if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags &
2483 (RTF_CLONING|RTF_XRESOLVE|RTF_LLINFO|RTF_BLACKHOLE)) {
2484 return; /* not interested in the link route */
2485 }
2486 /* do not look at cloned routes */
2487 #ifdef RTF_WASCLONED
2488 if (rtm->rtm_flags & RTF_WASCLONED)
2489 return;
2490 #endif
2491 #ifdef RTF_CLONED
2492 if (rtm->rtm_flags & RTF_CLONED)
2493 return;
2494 #endif
2495 /*
2496 * do not look at dynamic routes.
2497 * netbsd/openbsd cloned routes have UGHD.
2498 */
2499 if (rtm->rtm_flags & RTF_DYNAMIC)
2500 return;
2501 rtmp = (char *)(rtm + 1);
2502 /* Destination */
2503 if ((rtm->rtm_addrs & RTA_DST) == 0)
2504 return; /* ignore routes without destination address */
2505 sin6_dst = (struct sockaddr_in6 *)rtmp;
2506 rtmp += ROUNDUP(sin6_dst->sin6_len);
2507 if (rtm->rtm_addrs & RTA_GATEWAY) {
2508 sin6_gw = (struct sockaddr_in6 *)rtmp;
2509 rtmp += ROUNDUP(sin6_gw->sin6_len);
2510 }
2511 if (rtm->rtm_addrs & RTA_NETMASK) {
2512 sin6_mask = (struct sockaddr_in6 *)rtmp;
2513 rtmp += ROUNDUP(sin6_mask->sin6_len);
2514 }
2515 if (rtm->rtm_addrs & RTA_GENMASK) {
2516 sin6_genmask = (struct sockaddr_in6 *)rtmp;
2517 rtmp += ROUNDUP(sin6_genmask->sin6_len);
2518 }
2519 if (rtm->rtm_addrs & RTA_IFP) {
2520 sin6_ifp = (struct sockaddr_in6 *)rtmp;
2521 rtmp += ROUNDUP(sin6_ifp->sin6_len);
2522 }
2523
2524 /* Destination */
2525 if (sin6_dst->sin6_family != AF_INET6)
2526 return;
2527 if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr))
2528 return; /* Link-local */
2529 if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback))
2530 return; /* Loopback */
2531 if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr))
2532 return;
2533
2534 if ((rrt = MALLOC(struct riprt)) == NULL) {
2535 fatal("malloc: struct riprt");
2536 /*NOTREACHED*/
2537 }
2538 memset(rrt, 0, sizeof(*rrt));
2539 np = &rrt->rrt_info;
2540 rrt->rrt_same = NULL;
2541 rrt->rrt_t = time(NULL);
2542 if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC))
2543 rrt->rrt_t = 0; /* Don't age static routes */
2544 if ((rtm->rtm_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST)
2545 rrt->rrt_t = 0; /* Don't age non-gateway host routes */
2546 np->rip6_tag = 0;
2547 np->rip6_metric = rtm->rtm_rmx.rmx_hopcount;
2548 if (np->rip6_metric < 1)
2549 np->rip6_metric = 1;
2550 rrt->rrt_flags = rtm->rtm_flags;
2551 np->rip6_dest = sin6_dst->sin6_addr;
2552
2553 /* Mask or plen */
2554 if (rtm->rtm_flags & RTF_HOST)
2555 np->rip6_plen = 128; /* Host route */
2556 else if (sin6_mask)
2557 np->rip6_plen = sin6mask2len(sin6_mask);
2558 else
2559 np->rip6_plen = 0;
2560
2561 orrt = rtsearch(np, NULL);
2562 if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) {
2563 /* Already found */
2564 if (!again) {
2565 trace(1, "route: %s/%d flags %s: already registered\n",
2566 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2567 rtflags(rtm));
2568 }
2569 free(rrt);
2570 return;
2571 }
2572 /* Gateway */
2573 if (!sin6_gw)
2574 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2575 else {
2576 if (sin6_gw->sin6_family == AF_INET6)
2577 rrt->rrt_gw = sin6_gw->sin6_addr;
2578 else if (sin6_gw->sin6_family == AF_LINK) {
2579 /* XXX in case ppp link? */
2580 rrt->rrt_gw = in6addr_loopback;
2581 } else
2582 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2583 }
2584 trace(1, "route: %s/%d flags %s",
2585 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm));
2586 trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw));
2587
2588 /* Interface */
2589 s = rtm->rtm_index;
2590 if (s < nindex2ifc && index2ifc[s])
2591 ifname = index2ifc[s]->ifc_name;
2592 else {
2593 trace(1, " not configured\n");
2594 free(rrt);
2595 return;
2596 }
2597 trace(1, " if %s sock %d", ifname, s);
2598 rrt->rrt_index = s;
2599
2600 trace(1, "\n");
2601
2602 /* Check gateway */
2603 if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) &&
2604 !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)
2605 #ifdef __FreeBSD__
2606 && (rrt->rrt_flags & RTF_LOCAL) == 0
2607 #endif
2608 ) {
2609 trace(0, "***** Gateway %s is not a link-local address.\n",
2610 inet6_n2p(&rrt->rrt_gw));
2611 trace(0, "***** dest(%s) if(%s) -- Not optimized.\n",
2612 inet6_n2p(&rrt->rrt_info.rip6_dest), ifname);
2613 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR;
2614 }
2615
2616 /* Put it to the route list */
2617 if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) {
2618 /* replace route list */
2619 rrt->rrt_next = orrt->rrt_next;
2620 *orrt = *rrt;
2621 trace(1, "route: %s/%d flags %s: replace new route\n",
2622 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2623 rtflags(rtm));
2624 free(rrt);
2625 } else {
2626 rrt->rrt_next = riprt;
2627 riprt = rrt;
2628 }
2629 }
2630
2631 int
2632 addroute(struct riprt *rrt, const struct in6_addr *gw, struct ifc *ifcp)
2633 {
2634 struct netinfo6 *np;
2635 u_char buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ];
2636 struct rt_msghdr *rtm;
2637 struct sockaddr_in6 *sin6;
2638 int len;
2639
2640 np = &rrt->rrt_info;
2641 inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1));
2642 inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2));
2643 tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n",
2644 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2645 np->rip6_metric - 1, buf2);
2646 if (rtlog)
2647 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(),
2648 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2649 np->rip6_metric - 1, buf2);
2650 if (nflag)
2651 return 0;
2652
2653 memset(buf, 0, sizeof(buf));
2654 rtm = (struct rt_msghdr *)buf;
2655 rtm->rtm_type = RTM_ADD;
2656 rtm->rtm_version = RTM_VERSION;
2657 rtm->rtm_seq = ++seq;
2658 rtm->rtm_pid = pid;
2659 rtm->rtm_flags = rrt->rrt_flags;
2660 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2661 rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1;
2662 rtm->rtm_inits = RTV_HOPCOUNT;
2663 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2664 /* Destination */
2665 sin6->sin6_len = sizeof(struct sockaddr_in6);
2666 sin6->sin6_family = AF_INET6;
2667 sin6->sin6_addr = np->rip6_dest;
2668 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2669 /* Gateway */
2670 sin6->sin6_len = sizeof(struct sockaddr_in6);
2671 sin6->sin6_family = AF_INET6;
2672 sin6->sin6_addr = *gw;
2673 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2674 /* Netmask */
2675 sin6->sin6_len = sizeof(struct sockaddr_in6);
2676 sin6->sin6_family = AF_INET6;
2677 sin6->sin6_addr = *(plen2mask(np->rip6_plen));
2678 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2679
2680 len = (char *)sin6 - (char *)buf;
2681 rtm->rtm_msglen = len;
2682 if (write(rtsock, buf, len) > 0)
2683 return 0;
2684
2685 if (errno == EEXIST) {
2686 trace(0, "ADD: Route already exists %s/%d gw %s\n",
2687 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2688 if (rtlog)
2689 fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n",
2690 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2691 } else {
2692 trace(0, "Can not write to rtsock (addroute): %s\n",
2693 strerror(errno));
2694 if (rtlog)
2695 fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2696 strerror(errno));
2697 }
2698 return -1;
2699 }
2700
2701 int
2702 delroute(struct netinfo6 *np, struct in6_addr *gw)
2703 {
2704 u_char buf[BUFSIZ], buf2[BUFSIZ];
2705 struct rt_msghdr *rtm;
2706 struct sockaddr_in6 *sin6;
2707 int len;
2708
2709 inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2));
2710 tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest),
2711 np->rip6_plen, buf2);
2712 if (rtlog)
2713 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n",
2714 hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2715 if (nflag)
2716 return 0;
2717
2718 memset(buf, 0, sizeof(buf));
2719 rtm = (struct rt_msghdr *)buf;
2720 rtm->rtm_type = RTM_DELETE;
2721 rtm->rtm_version = RTM_VERSION;
2722 rtm->rtm_seq = ++seq;
2723 rtm->rtm_pid = pid;
2724 rtm->rtm_flags = RTF_UP | RTF_GATEWAY;
2725 if (np->rip6_plen == sizeof(struct in6_addr) * 8)
2726 rtm->rtm_flags |= RTF_HOST;
2727 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2728 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2729 /* Destination */
2730 sin6->sin6_len = sizeof(struct sockaddr_in6);
2731 sin6->sin6_family = AF_INET6;
2732 sin6->sin6_addr = np->rip6_dest;
2733 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2734 /* Gateway */
2735 sin6->sin6_len = sizeof(struct sockaddr_in6);
2736 sin6->sin6_family = AF_INET6;
2737 sin6->sin6_addr = *gw;
2738 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2739 /* Netmask */
2740 sin6->sin6_len = sizeof(struct sockaddr_in6);
2741 sin6->sin6_family = AF_INET6;
2742 sin6->sin6_addr = *(plen2mask(np->rip6_plen));
2743 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2744
2745 len = (char *)sin6 - (char *)buf;
2746 rtm->rtm_msglen = len;
2747 if (write(rtsock, buf, len) >= 0)
2748 return 0;
2749
2750 if (errno == ESRCH) {
2751 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n",
2752 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2753 if (rtlog)
2754 fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n",
2755 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2756 } else {
2757 trace(0, "Can not write to rtsock (delroute): %s\n",
2758 strerror(errno));
2759 if (rtlog)
2760 fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2761 strerror(errno));
2762 }
2763 return -1;
2764 }
2765
2766 struct in6_addr *
2767 getroute(struct netinfo6 *np, struct in6_addr *gw)
2768 {
2769 u_char buf[BUFSIZ];
2770 int myseq;
2771 int len;
2772 struct rt_msghdr *rtm;
2773 struct sockaddr_in6 *sin6;
2774
2775 rtm = (struct rt_msghdr *)buf;
2776 len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6);
2777 memset(rtm, 0, len);
2778 rtm->rtm_type = RTM_GET;
2779 rtm->rtm_version = RTM_VERSION;
2780 myseq = ++seq;
2781 rtm->rtm_seq = myseq;
2782 rtm->rtm_addrs = RTA_DST;
2783 rtm->rtm_msglen = len;
2784 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2785 sin6->sin6_len = sizeof(struct sockaddr_in6);
2786 sin6->sin6_family = AF_INET6;
2787 sin6->sin6_addr = np->rip6_dest;
2788 if (write(rtsock, buf, len) < 0) {
2789 if (errno == ESRCH) /* No such route found */
2790 return NULL;
2791 perror("write to rtsock");
2792 exit(1);
2793 }
2794 do {
2795 if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
2796 perror("read from rtsock");
2797 exit(1);
2798 }
2799 rtm = (struct rt_msghdr *)buf;
2800 } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid);
2801 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2802 if (rtm->rtm_addrs & RTA_DST) {
2803 sin6 = (struct sockaddr_in6 *)
2804 ((char *)sin6 + ROUNDUP(sin6->sin6_len));
2805 }
2806 if (rtm->rtm_addrs & RTA_GATEWAY) {
2807 *gw = sin6->sin6_addr;
2808 return gw;
2809 }
2810 return NULL;
2811 }
2812
2813 const char *
2814 inet6_n2p(const struct in6_addr *p)
2815 {
2816 static char buf[BUFSIZ];
2817
2818 return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf));
2819 }
2820
2821 void
2822 ifrtdump(int sig)
2823 {
2824
2825 ifdump(sig);
2826 rtdump(sig);
2827 }
2828
2829 void
2830 ifdump(int sig)
2831 {
2832 struct ifc *ifcp;
2833 FILE *dump;
2834 int i;
2835
2836 if (sig == 0)
2837 dump = stderr;
2838 else
2839 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2840 dump = stderr;
2841
2842 fprintf(dump, "%s: Interface Table Dump\n", hms());
2843 fprintf(dump, " Number of interfaces: %d\n", nifc);
2844 for (i = 0; i < 2; i++) {
2845 fprintf(dump, " %sadvertising interfaces:\n", i ? "non-" : "");
2846 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
2847 if (i == 0) {
2848 if ((ifcp->ifc_flags & IFF_UP) == 0)
2849 continue;
2850 if (iff_find(ifcp, 'N') != NULL)
2851 continue;
2852 } else {
2853 if (ifcp->ifc_flags & IFF_UP)
2854 continue;
2855 }
2856 ifdump0(dump, ifcp);
2857 }
2858 }
2859 fprintf(dump, "\n");
2860 if (dump != stderr)
2861 fclose(dump);
2862 }
2863
2864 void
2865 ifdump0(FILE *dump, const struct ifc *ifcp)
2866 {
2867 struct ifac *ifa;
2868 struct iff *iffp;
2869 char buf[BUFSIZ];
2870 const char *ft;
2871 int addr;
2872
2873 fprintf(dump, " %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n",
2874 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags),
2875 inet6_n2p(&ifcp->ifc_mylladdr),
2876 ifcp->ifc_mtu, ifcp->ifc_metric);
2877 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2878 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
2879 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr,
2880 buf, sizeof(buf));
2881 fprintf(dump, "\t%s/%d -- %s\n",
2882 inet6_n2p(&ifa->ifa_addr),
2883 ifa->ifa_plen, buf);
2884 } else {
2885 fprintf(dump, "\t%s/%d\n",
2886 inet6_n2p(&ifa->ifa_addr),
2887 ifa->ifa_plen);
2888 }
2889 }
2890 if (ifcp->ifc_filter) {
2891 fprintf(dump, "\tFilter:");
2892 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
2893 addr = 0;
2894 switch (iffp->iff_type) {
2895 case 'A':
2896 ft = "Aggregate"; addr++; break;
2897 case 'N':
2898 ft = "No-use"; break;
2899 case 'O':
2900 ft = "Advertise-only"; addr++; break;
2901 case 'T':
2902 ft = "Default-only"; break;
2903 case 'L':
2904 ft = "Listen-only"; addr++; break;
2905 default:
2906 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type);
2907 ft = buf;
2908 addr++;
2909 break;
2910 }
2911 fprintf(dump, " %s", ft);
2912 if (addr) {
2913 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr),
2914 iffp->iff_plen);
2915 }
2916 }
2917 fprintf(dump, "\n");
2918 }
2919 }
2920
2921 void
2922 rtdump(int sig)
2923 {
2924 struct riprt *rrt;
2925 char buf[BUFSIZ];
2926 FILE *dump;
2927 time_t t, age;
2928
2929 if (sig == 0)
2930 dump = stderr;
2931 else
2932 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2933 dump = stderr;
2934
2935 t = time(NULL);
2936 fprintf(dump, "\n%s: Routing Table Dump\n", hms());
2937 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
2938 if (rrt->rrt_t == 0)
2939 age = 0;
2940 else
2941 age = t - rrt->rrt_t;
2942 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest,
2943 buf, sizeof(buf));
2944 fprintf(dump, " %s/%d if(%d:%s) gw(%s) [%d] age(%ld)",
2945 buf, rrt->rrt_info.rip6_plen, rrt->rrt_index,
2946 index2ifc[rrt->rrt_index]->ifc_name,
2947 inet6_n2p(&rrt->rrt_gw),
2948 rrt->rrt_info.rip6_metric, (long)age);
2949 if (rrt->rrt_info.rip6_tag) {
2950 fprintf(dump, " tag(0x%04x)",
2951 ntohs(rrt->rrt_info.rip6_tag) & 0xffff);
2952 }
2953 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)
2954 fprintf(dump, " NOT-LL");
2955 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
2956 fprintf(dump, " NO-ADV");
2957 fprintf(dump, "\n");
2958 }
2959 fprintf(dump, "\n");
2960 if (dump != stderr)
2961 fclose(dump);
2962 }
2963
2964 /*
2965 * Parse the -A (and -O) options and put corresponding filter object to the
2966 * specified interface structures. Each of the -A/O option has the following
2967 * syntax: -A 5f09:c400::/32,ef0,ef1 (aggregate)
2968 * -O 5f09:c400::/32,ef0,ef1 (only when match)
2969 */
2970 void
2971 filterconfig(void)
2972 {
2973 int i;
2974 char *p, *ap, *iflp, *ifname, *ep;
2975 struct iff ftmp, *iff_obj;
2976 struct ifc *ifcp;
2977 struct riprt *rrt;
2978 #if 0
2979 struct in6_addr gw;
2980 #endif
2981 u_long plen;
2982
2983 for (i = 0; i < nfilter; i++) {
2984 ap = filter[i];
2985 iflp = NULL;
2986 ifcp = NULL;
2987 if (filtertype[i] == 'N' || filtertype[i] == 'T') {
2988 iflp = ap;
2989 goto ifonly;
2990 }
2991 if ((p = strchr(ap, ',')) != NULL) {
2992 *p++ = '\0';
2993 iflp = p;
2994 }
2995 if ((p = strchr(ap, '/')) == NULL) {
2996 fatal("no prefixlen specified for '%s'", ap);
2997 /*NOTREACHED*/
2998 }
2999 *p++ = '\0';
3000 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) {
3001 fatal("invalid prefix specified for '%s'", ap);
3002 /*NOTREACHED*/
3003 }
3004 errno = 0;
3005 ep = NULL;
3006 plen = strtoul(p, &ep, 10);
3007 if (errno || !*p || *ep || plen > sizeof(ftmp.iff_addr) * 8) {
3008 fatal("invalid prefix length specified for '%s'", ap);
3009 /*NOTREACHED*/
3010 }
3011 ftmp.iff_plen = plen;
3012 ftmp.iff_next = NULL;
3013 applyplen(&ftmp.iff_addr, ftmp.iff_plen);
3014 ifonly:
3015 ftmp.iff_type = filtertype[i];
3016 if (iflp == NULL || *iflp == '\0') {
3017 fatal("no interface specified for '%s'", ap);
3018 /*NOTREACHED*/
3019 }
3020 /* parse the interface listing portion */
3021 while (iflp) {
3022 ifname = iflp;
3023 if ((iflp = strchr(iflp, ',')) != NULL)
3024 *iflp++ = '\0';
3025 ifcp = ifc_find(ifname);
3026 if (ifcp == NULL) {
3027 fatal("no interface %s exists", ifname);
3028 /*NOTREACHED*/
3029 }
3030 iff_obj = (struct iff *)malloc(sizeof(struct iff));
3031 if (iff_obj == NULL) {
3032 fatal("malloc of iff_obj");
3033 /*NOTREACHED*/
3034 }
3035 memcpy((void *)iff_obj, (void *)&ftmp,
3036 sizeof(struct iff));
3037 /* link it to the interface filter */
3038 iff_obj->iff_next = ifcp->ifc_filter;
3039 ifcp->ifc_filter = iff_obj;
3040 }
3041
3042 /*
3043 * -A: aggregate configuration.
3044 */
3045 if (filtertype[i] != 'A')
3046 continue;
3047 /* put the aggregate to the kernel routing table */
3048 rrt = (struct riprt *)malloc(sizeof(struct riprt));
3049 if (rrt == NULL) {
3050 fatal("malloc: rrt");
3051 /*NOTREACHED*/
3052 }
3053 memset(rrt, 0, sizeof(struct riprt));
3054 rrt->rrt_info.rip6_dest = ftmp.iff_addr;
3055 rrt->rrt_info.rip6_plen = ftmp.iff_plen;
3056 rrt->rrt_info.rip6_metric = 1;
3057 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
3058 rrt->rrt_gw = in6addr_loopback;
3059 rrt->rrt_flags = RTF_UP | RTF_REJECT;
3060 rrt->rrt_rflags = RRTF_AGGREGATE;
3061 rrt->rrt_t = 0;
3062 rrt->rrt_index = loopifcp->ifc_index;
3063 #if 0
3064 if (getroute(&rrt->rrt_info, &gw)) {
3065 #if 0
3066 /*
3067 * When the address has already been registered in the
3068 * kernel routing table, it should be removed
3069 */
3070 delroute(&rrt->rrt_info, &gw);
3071 #else
3072 /* it is safer behavior */
3073 errno = EINVAL;
3074 fatal("%s/%u already in routing table, "
3075 "cannot aggregate",
3076 inet6_n2p(&rrt->rrt_info.rip6_dest),
3077 rrt->rrt_info.rip6_plen);
3078 /*NOTREACHED*/
3079 #endif
3080 }
3081 #endif
3082 /* Put the route to the list */
3083 rrt->rrt_next = riprt;
3084 riprt = rrt;
3085 trace(1, "Aggregate: %s/%d for %s\n",
3086 inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen,
3087 ifcp->ifc_name);
3088 /* Add this route to the kernel */
3089 if (nflag) /* do not modify kernel routing table */
3090 continue;
3091 addroute(rrt, &in6addr_loopback, loopifcp);
3092 }
3093 }
3094
3095 /***************** utility functions *****************/
3096
3097 /*
3098 * Returns a pointer to ifac whose address and prefix length matches
3099 * with the address and prefix length specified in the arguments.
3100 */
3101 struct ifac *
3102 ifa_match(const struct ifc *ifcp, const struct in6_addr *ia, int plen)
3103 {
3104 struct ifac *ifa;
3105
3106 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
3107 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) &&
3108 ifa->ifa_plen == plen)
3109 break;
3110 }
3111 return ifa;
3112 }
3113
3114 /*
3115 * Return a pointer to riprt structure whose address and prefix length
3116 * matches with the address and prefix length found in the argument.
3117 * Note: This is not a rtalloc(). Therefore exact match is necessary.
3118 */
3119 struct riprt *
3120 rtsearch(struct netinfo6 *np, struct riprt **prev_rrt)
3121 {
3122 struct riprt *rrt;
3123
3124 if (prev_rrt)
3125 *prev_rrt = NULL;
3126 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
3127 if (rrt->rrt_info.rip6_plen == np->rip6_plen &&
3128 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
3129 &np->rip6_dest))
3130 return rrt;
3131 if (prev_rrt)
3132 *prev_rrt = rrt;
3133 }
3134 if (prev_rrt)
3135 *prev_rrt = NULL;
3136 return 0;
3137 }
3138
3139 int
3140 sin6mask2len(const struct sockaddr_in6 *sin6)
3141 {
3142
3143 return mask2len(&sin6->sin6_addr,
3144 sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr));
3145 }
3146
3147 int
3148 mask2len(const struct in6_addr *addr, int lenlim)
3149 {
3150 int i = 0, j;
3151 const u_char *p = (const u_char *)addr;
3152
3153 for (j = 0; j < lenlim; j++, p++) {
3154 if (*p != 0xff)
3155 break;
3156 i += 8;
3157 }
3158 if (j < lenlim) {
3159 switch (*p) {
3160 #define MASKLEN(m, l) case m: do { i += l; break; } while (0)
3161 MASKLEN(0xfe, 7); break;
3162 MASKLEN(0xfc, 6); break;
3163 MASKLEN(0xf8, 5); break;
3164 MASKLEN(0xf0, 4); break;
3165 MASKLEN(0xe0, 3); break;
3166 MASKLEN(0xc0, 2); break;
3167 MASKLEN(0x80, 1); break;
3168 #undef MASKLEN
3169 }
3170 }
3171 return i;
3172 }
3173
3174 void
3175 applymask(struct in6_addr *addr, struct in6_addr *mask)
3176 {
3177 int i;
3178 u_long *p, *q;
3179
3180 p = (u_long *)addr; q = (u_long *)mask;
3181 for (i = 0; i < 4; i++)
3182 *p++ &= *q++;
3183 }
3184
3185 static const u_char plent[8] = {
3186 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
3187 };
3188
3189 void
3190 applyplen(struct in6_addr *ia, int plen)
3191 {
3192 u_char *p;
3193 int i;
3194
3195 p = ia->s6_addr;
3196 for (i = 0; i < 16; i++) {
3197 if (plen <= 0)
3198 *p = 0;
3199 else if (plen < 8)
3200 *p &= plent[plen];
3201 p++, plen -= 8;
3202 }
3203 }
3204
3205 static const int pl2m[9] = {
3206 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
3207 };
3208
3209 struct in6_addr *
3210 plen2mask(int n)
3211 {
3212 static struct in6_addr ia;
3213 u_char *p;
3214 int i;
3215
3216 memset(&ia, 0, sizeof(struct in6_addr));
3217 p = (u_char *)&ia;
3218 for (i = 0; i < 16; i++, p++, n -= 8) {
3219 if (n >= 8) {
3220 *p = 0xff;
3221 continue;
3222 }
3223 *p = pl2m[n];
3224 break;
3225 }
3226 return &ia;
3227 }
3228
3229 char *
3230 allocopy(char *p)
3231 {
3232 int len = strlen(p) + 1;
3233 char *q = (char *)malloc(len);
3234
3235 if (!q) {
3236 fatal("malloc");
3237 /*NOTREACHED*/
3238 }
3239
3240 strlcpy(q, p, len);
3241 return q;
3242 }
3243
3244 char *
3245 hms(void)
3246 {
3247 static char buf[BUFSIZ];
3248 time_t t;
3249 struct tm *tm;
3250
3251 t = time(NULL);
3252 if ((tm = localtime(&t)) == 0) {
3253 fatal("localtime");
3254 /*NOTREACHED*/
3255 }
3256 snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min,
3257 tm->tm_sec);
3258 return buf;
3259 }
3260
3261 #define RIPRANDDEV 1.0 /* 30 +- 15, max - min = 30 */
3262
3263 int
3264 ripinterval(int timer)
3265 {
3266 double r = rand();
3267
3268 interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5));
3269 nextalarm = time(NULL) + interval;
3270 return interval;
3271 }
3272
3273 time_t
3274 ripsuptrig(void)
3275 {
3276 time_t t;
3277
3278 double r = rand();
3279 t = (int)(RIP_TRIG_INT6_MIN +
3280 (RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX));
3281 sup_trig_update = time(NULL) + t;
3282 return t;
3283 }
3284
3285 void
3286 fatal(const char *fmt, ...)
3287 {
3288 va_list ap;
3289 char buf[1024];
3290
3291 va_start(ap, fmt);
3292 vsnprintf(buf, sizeof(buf), fmt, ap);
3293 va_end(ap);
3294 perror(buf);
3295 if (errno)
3296 syslog(LOG_ERR, "%s: %s", buf, strerror(errno));
3297 else
3298 syslog(LOG_ERR, "%s", buf);
3299 rtdexit();
3300 }
3301
3302 void
3303 tracet(int level, const char *fmt, ...)
3304 {
3305 va_list ap;
3306
3307 if (level <= dflag) {
3308 va_start(ap, fmt);
3309 fprintf(stderr, "%s: ", hms());
3310 vfprintf(stderr, fmt, ap);
3311 va_end(ap);
3312 }
3313 if (dflag) {
3314 va_start(ap, fmt);
3315 if (level > 0)
3316 vsyslog(LOG_DEBUG, fmt, ap);
3317 else
3318 vsyslog(LOG_WARNING, fmt, ap);
3319 va_end(ap);
3320 }
3321 }
3322
3323 void
3324 trace(int level, const char *fmt, ...)
3325 {
3326 va_list ap;
3327
3328 if (level <= dflag) {
3329 va_start(ap, fmt);
3330 vfprintf(stderr, fmt, ap);
3331 va_end(ap);
3332 }
3333 if (dflag) {
3334 va_start(ap, fmt);
3335 if (level > 0)
3336 vsyslog(LOG_DEBUG, fmt, ap);
3337 else
3338 vsyslog(LOG_WARNING, fmt, ap);
3339 va_end(ap);
3340 }
3341 }
3342
3343 unsigned int
3344 if_maxindex(void)
3345 {
3346 struct if_nameindex *p, *p0;
3347 unsigned int max = 0;
3348
3349 p0 = if_nameindex();
3350 for (p = p0; p && p->if_index && p->if_name; p++) {
3351 if (max < p->if_index)
3352 max = p->if_index;
3353 }
3354 if_freenameindex(p0);
3355 return max;
3356 }
3357
3358 struct ifc *
3359 ifc_find(char *name)
3360 {
3361 struct ifc *ifcp;
3362
3363 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
3364 if (strcmp(name, ifcp->ifc_name) == 0)
3365 return ifcp;
3366 }
3367 return (struct ifc *)NULL;
3368 }
3369
3370 struct iff *
3371 iff_find(struct ifc *ifcp, int type)
3372 {
3373 struct iff *iffp;
3374
3375 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
3376 if (iffp->iff_type == type)
3377 return iffp;
3378 }
3379 return NULL;
3380 }
3381
3382 void
3383 setindex2ifc(int idx, struct ifc *ifcp)
3384 {
3385 int n, nsize;
3386 struct ifc **p;
3387
3388 if (!index2ifc) {
3389 nindex2ifc = 5; /*initial guess*/
3390 index2ifc = (struct ifc **)
3391 malloc(sizeof(*index2ifc) * nindex2ifc);
3392 if (index2ifc == NULL) {
3393 fatal("malloc");
3394 /*NOTREACHED*/
3395 }
3396 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc);
3397 }
3398 n = nindex2ifc;
3399 for (nsize = nindex2ifc; nsize <= idx; nsize *= 2)
3400 ;
3401 if (n != nsize) {
3402 p = (struct ifc **)realloc(index2ifc,
3403 sizeof(*index2ifc) * nsize);
3404 if (p == NULL) {
3405 fatal("realloc");
3406 /*NOTREACHED*/
3407 }
3408 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n));
3409 index2ifc = p;
3410 nindex2ifc = nsize;
3411 }
3412 index2ifc[idx] = ifcp;
3413 }
NetBSD on the FriendlyARM MINI2440