1 /* $FreeBSD: src/usr.sbin/route6d/route6d.c,v 1.2.2.5 2001/07/03 11:02:09 ume Exp $ */
2 /* $KAME: route6d.c,v 1.64 2001/05/08 04:36:37 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 * $KAME: route6d.c,v 1.64 2001/05/08 04:36:37 itojun Exp $
33 */
34
35 #define _KERNEL_STRUCTURES
36
37 #include <stdio.h>
38
39 #include <time.h>
40 #include <unistd.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <signal.h>
44 #include <stdarg.h>
45 #include <syslog.h>
46 #include <stddef.h>
47 #include <errno.h>
48 #include <err.h>
49
50 #include <sys/types.h>
51 #include <sys/param.h>
52 #include <sys/file.h>
53 #include <sys/socket.h>
54 #include <sys/ioctl.h>
55 #include <sys/sysctl.h>
56 #include <sys/uio.h>
57 #include <net/if.h>
58 #if defined(__DragonFly__)
59 #include <net/if_var.h>
60 #endif /* __DragonFly__ */
61 #include <net/route.h>
62 #include <netinet/in.h>
63 #include <netinet/in_var.h>
64 #include <netinet/ip6.h>
65 #include <netinet/udp.h>
66 #include <netdb.h>
67 #include <ifaddrs.h>
68
69 #include <arpa/inet.h>
70
71 #include "route6d.h"
72
73 #define MAXFILTER 40
74
75 #ifdef DEBUG
76 #define INIT_INTERVAL6 6
77 #else
78 #define INIT_INTERVAL6 10 /* Wait to submit a initial riprequest */
79 #endif
80
81 /*
82 * Following two macros are highly depending on KAME Release
83 */
84 #define IN6_LINKLOCAL_IFINDEX(addr) \
85 ((addr).s6_addr[2] << 8 | (addr).s6_addr[3])
86
87 #define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \
88 do { \
89 (addr).s6_addr[2] = ((index) >> 8) & 0xff; \
90 (addr).s6_addr[3] = (index) & 0xff; \
91 } while (0)
92
93 struct ifc { /* Configuration of an interface */
94 char *ifc_name; /* if name */
95 struct ifc *ifc_next;
96 int ifc_index; /* if index */
97 int ifc_mtu; /* if mtu */
98 int ifc_metric; /* if metric */
99 u_int ifc_flags; /* flags */
100 short ifc_cflags; /* IFC_XXX */
101 struct in6_addr ifc_mylladdr; /* my link-local address */
102 struct sockaddr_in6 ifc_ripsin; /* rip multicast address */
103 struct iff *ifc_filter; /* filter structure */
104 struct ifac *ifc_addr; /* list of AF_INET6 addresses */
105 int ifc_joined; /* joined to ff02::9 */
106 };
107
108 struct ifac { /* Adddress associated to an interface */
109 struct ifc *ifa_conf; /* back pointer */
110 struct ifac *ifa_next;
111 struct in6_addr ifa_addr; /* address */
112 struct in6_addr ifa_raddr; /* remote address, valid in p2p */
113 int ifa_plen; /* prefix length */
114 };
115
116 struct iff {
117 int iff_type;
118 struct in6_addr iff_addr;
119 int iff_plen;
120 struct iff *iff_next;
121 };
122
123 static struct ifc *ifc;
124 static int nifc; /* number of valid ifc's */
125 static struct ifc **index2ifc;
126 static int nindex2ifc;
127 static struct ifc *loopifcp = NULL; /* pointing to loopback */
128 static int loopifindex = 0; /* ditto */
129 static fd_set sockvec; /* vector to select() for receiving */
130 static int rtsock; /* the routing socket */
131 static int ripsock; /* socket to send/receive RIP datagram */
132
133 static struct rip6 *ripbuf; /* packet buffer for sending */
134
135 /*
136 * Maintain the routes in a linked list. When the number of the routes
137 * grows, somebody would like to introduce a hash based or a radix tree
138 * based structure. I believe the number of routes handled by RIP is
139 * limited and I don't have to manage a complex data structure, however.
140 *
141 * One of the major drawbacks of the linear linked list is the difficulty
142 * of representing the relationship between a couple of routes. This may
143 * be a significant problem when we have to support route aggregation with
144 * supressing the specifices covered by the aggregate.
145 */
146
147 struct riprt {
148 struct riprt *rrt_next; /* next destination */
149 struct riprt *rrt_same; /* same destination - future use */
150 struct netinfo6 rrt_info; /* network info */
151 struct in6_addr rrt_gw; /* gateway */
152 u_long rrt_flags; /* kernel routing table flags */
153 u_long rrt_rflags; /* route6d routing table flags */
154 time_t rrt_t; /* when the route validated */
155 int rrt_index; /* ifindex from which this route got */
156 };
157
158 static struct riprt *riprt = NULL;
159
160 static int dflag = 0; /* debug flag */
161 static int qflag = 0; /* quiet flag */
162 static int nflag = 0; /* don't update kernel routing table */
163 static int aflag = 0; /* age out even the statically defined routes */
164 static int hflag = 0; /* don't split horizon */
165 static int lflag = 0; /* exchange site local routes */
166 static int sflag = 0; /* announce static routes w/ split horizon */
167 static int Sflag = 0; /* announce static routes to every interface */
168 static unsigned long routetag = 0; /* route tag attached on originating case */
169
170 static char *filter[MAXFILTER];
171 static int filtertype[MAXFILTER];
172 static int nfilter = 0;
173
174 static pid_t pid;
175
176 static struct sockaddr_storage ripsin;
177
178 static int interval = 1;
179 static time_t nextalarm = 0;
180
181 static FILE *rtlog = NULL;
182
183 static int logopened = 0;
184
185 static u_long seq = 0;
186
187 static volatile int signo;
188 static volatile sig_atomic_t seenalrm;
189 static volatile sig_atomic_t seenquit;
190 static volatile sig_atomic_t seenusr1;
191
192 #define RRTF_AGGREGATE 0x08000000
193 #define RRTF_NOADVERTISE 0x10000000
194 #define RRTF_NH_NOT_LLADDR 0x20000000
195 #define RRTF_SENDANYWAY 0x40000000
196 #define RRTF_CHANGED 0x80000000
197
198 static void sighandler(int);
199 static void ripalarm(void);
200 static void riprecv(void);
201 static void ripsend(struct ifc *, struct sockaddr_in6 *, int);
202 static int out_filter(struct riprt *, struct ifc *);
203 static void init(void);
204 static void ifconfig(void);
205 static void ifconfig1(const char *, const struct sockaddr *, struct ifc *, int);
206 static void rtrecv(void);
207 static int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *,
208 const struct sockaddr_in6 *);
209 static int rt_deladdr(struct ifc *, const struct sockaddr_in6 *,
210 const struct sockaddr_in6 *);
211 static void filterconfig(void);
212 static int getifmtu(int);
213 static const char *rttypes(struct rt_msghdr *);
214 static const char *rtflags(struct rt_msghdr *);
215 static const char *ifflags(int);
216 static int ifrt(struct ifc *, int);
217 static void ifrt_p2p(struct ifc *, int);
218 static void applyplen(struct in6_addr *, int);
219 static void ifrtdump(int);
220 static void ifdump(int);
221 static void ifdump0(FILE *, const struct ifc *);
222 static void rtdump(int);
223 static void rt_entry(struct rt_msghdr *, int);
224 static void rtdexit(void) __dead2;
225 static void riprequest(struct ifc *, struct netinfo6 *, int,
226 struct sockaddr_in6 *);
227 static void ripflush(struct ifc *, struct sockaddr_in6 *);
228 static void sendrequest(struct ifc *);
229 static int sin6mask2len(const struct sockaddr_in6 *);
230 static int mask2len(const struct in6_addr *, int);
231 static int sendpacket(struct sockaddr_in6 *, int);
232 static int addroute(struct riprt *, const struct in6_addr *, struct ifc *);
233 static int delroute(struct netinfo6 *, struct in6_addr *);
234 #if 0
235 static struct in6_addr *getroute(struct netinfo6 *, struct in6_addr *);
236 #endif
237 static void krtread(int);
238 static int tobeadv(struct riprt *, struct ifc *);
239 static char *allocopy(char *);
240 static char *hms(void);
241 static const char *inet6_n2p(const struct in6_addr *);
242 static struct ifac *ifa_match(const struct ifc *, const struct in6_addr *, int);
243 static struct in6_addr *plen2mask(int);
244 static struct riprt *rtsearch(struct netinfo6 *, struct riprt **);
245 static int ripinterval(int);
246 static void fatal(const char *, ...) __dead2 __printflike(1, 2);
247 static void trace(int, const char *, ...) __printflike(2, 3);
248 static void tracet(int, const char *, ...) __printflike(2, 3);
249 static struct ifc *ifc_find(char *);
250 static struct iff *iff_find(struct ifc *, int);
251 static void setindex2ifc(int, struct ifc *);
252
253 #define MALLOC(type) ((type *)malloc(sizeof(type)))
254
255 int
main(int argc,char ** argv)256 main(int argc, char **argv)
257 {
258 int ch;
259 int error = 0;
260 struct ifc *ifcp;
261 sigset_t mask, omask;
262 FILE *pidfile;
263 char *progname;
264 char *ep;
265
266 progname = strrchr(*argv, '/');
267 if (progname)
268 progname++;
269 else
270 progname = *argv;
271
272 pid = getpid();
273 while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) {
274 switch (ch) {
275 case 'A':
276 case 'N':
277 case 'O':
278 case 'T':
279 case 'L':
280 if (nfilter >= MAXFILTER) {
281 fatal("Exceeds MAXFILTER");
282 /*NOTREACHED*/
283 }
284 filtertype[nfilter] = ch;
285 filter[nfilter++] = allocopy(optarg);
286 break;
287 case 't':
288 ep = NULL;
289 routetag = strtoul(optarg, &ep, 0);
290 if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) {
291 fatal("invalid route tag");
292 /*NOTREACHED*/
293 }
294 break;
295 case 'R':
296 if ((rtlog = fopen(optarg, "w")) == NULL) {
297 fatal("Can not write to routelog");
298 /*NOTREACHED*/
299 }
300 break;
301 #define FLAG(c, flag, n) case c: do { flag = n; break; } while(0)
302 FLAG('a', aflag, 1); break;
303 FLAG('d', dflag, 1); break;
304 FLAG('D', dflag, 2); break;
305 FLAG('h', hflag, 1); break;
306 FLAG('l', lflag, 1); break;
307 FLAG('n', nflag, 1); break;
308 FLAG('q', qflag, 1); break;
309 FLAG('s', sflag, 1); break;
310 FLAG('S', Sflag, 1); break;
311 #undef FLAG
312 default:
313 fatal("Invalid option specified, terminating");
314 /*NOTREACHED*/
315 }
316 }
317 argc -= optind;
318 argv += optind;
319 if (argc > 0) {
320 fatal("bogus extra arguments");
321 /*NOTREACHED*/
322 }
323
324 if (geteuid()) {
325 nflag = 1;
326 fprintf(stderr, "No kernel update is allowed\n");
327 }
328 openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
329 logopened++;
330
331 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL)
332 fatal("malloc");
333 memset(ripbuf, 0, RIP6_MAXMTU);
334 ripbuf->rip6_cmd = RIP6_RESPONSE;
335 ripbuf->rip6_vers = RIP6_VERSION;
336 ripbuf->rip6_res1[0] = 0;
337 ripbuf->rip6_res1[1] = 0;
338
339 init();
340 ifconfig();
341 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
342 if (ifcp->ifc_index < 0) {
343 fprintf(stderr,
344 "No ifindex found at %s (no link-local address?)\n",
345 ifcp->ifc_name);
346 error++;
347 }
348 }
349 if (error)
350 exit(1);
351 if (loopifcp == NULL) {
352 fatal("No loopback found");
353 /*NOTREACHED*/
354 }
355 loopifindex = loopifcp->ifc_index;
356 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
357 ifrt(ifcp, 0);
358 filterconfig();
359 krtread(0);
360 if (dflag)
361 ifrtdump(0);
362
363 if (dflag == 0) {
364 #if 1
365 if (daemon(0, 0) < 0) {
366 fatal("daemon");
367 /*NOTREACHED*/
368 }
369 #else
370 if (fork())
371 exit(0);
372 if (setsid() < 0) {
373 fatal("setid");
374 /*NOTREACHED*/
375 }
376 #endif
377 }
378 pid = getpid();
379 if ((pidfile = fopen(ROUTE6D_PID, "w")) != NULL) {
380 fprintf(pidfile, "%d\n", pid);
381 fclose(pidfile);
382 }
383
384 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) {
385 fatal("malloc");
386 /*NOTREACHED*/
387 }
388 memset(ripbuf, 0, RIP6_MAXMTU);
389 ripbuf->rip6_cmd = RIP6_RESPONSE;
390 ripbuf->rip6_vers = RIP6_VERSION;
391 ripbuf->rip6_res1[0] = 0;
392 ripbuf->rip6_res1[1] = 0;
393
394 if (signal(SIGALRM, sighandler) == SIG_ERR ||
395 signal(SIGQUIT, sighandler) == SIG_ERR ||
396 signal(SIGTERM, sighandler) == SIG_ERR ||
397 signal(SIGUSR1, sighandler) == SIG_ERR ||
398 signal(SIGHUP, sighandler) == SIG_ERR ||
399 signal(SIGINT, sighandler) == SIG_ERR) {
400 fatal("signal");
401 /*NOTREACHED*/
402 }
403 /*
404 * To avoid rip packet congestion (not on a cable but in this
405 * process), wait for a moment to send the first RIP6_RESPONSE
406 * packets.
407 */
408 alarm(ripinterval(INIT_INTERVAL6));
409
410 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
411 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
412 sendrequest(ifcp);
413 }
414
415 syslog(LOG_INFO, "**** Started ****");
416 sigemptyset(&mask);
417 sigaddset(&mask, SIGALRM);
418 while (1) {
419 fd_set recvec;
420
421 if (seenalrm) {
422 ripalarm();
423 seenalrm = 0;
424 continue;
425 }
426 if (seenquit) {
427 rtdexit();
428 seenquit = 0;
429 continue;
430 }
431 if (seenusr1) {
432 ifrtdump(SIGUSR1);
433 seenusr1 = 0;
434 continue;
435 }
436
437 FD_COPY(&sockvec, &recvec);
438 signo = 0;
439 switch (select(FD_SETSIZE, &recvec, 0, 0, 0)) {
440 case -1:
441 if (errno != EINTR) {
442 fatal("select");
443 /*NOTREACHED*/
444 }
445 continue;
446 case 0:
447 continue;
448 default:
449 if (FD_ISSET(ripsock, &recvec)) {
450 sigprocmask(SIG_BLOCK, &mask, &omask);
451 riprecv();
452 sigprocmask(SIG_SETMASK, &omask, NULL);
453 }
454 if (FD_ISSET(rtsock, &recvec)) {
455 sigprocmask(SIG_BLOCK, &mask, &omask);
456 rtrecv();
457 sigprocmask(SIG_SETMASK, &omask, NULL);
458 }
459 }
460 }
461 }
462
463 static void
sighandler(int sig)464 sighandler(int sig)
465 {
466
467 signo = sig;
468 switch (signo) {
469 case SIGALRM:
470 seenalrm++;
471 break;
472 case SIGQUIT:
473 case SIGTERM:
474 seenquit++;
475 break;
476 case SIGUSR1:
477 case SIGHUP:
478 case SIGINT:
479 seenusr1++;
480 break;
481 }
482 }
483
484 /*
485 * gracefully exits after resetting sockopts.
486 */
487 /* ARGSUSED */
488 static void
rtdexit(void)489 rtdexit(void)
490 {
491 struct riprt *rrt;
492
493 alarm(0);
494 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
495 if (rrt->rrt_rflags & RRTF_AGGREGATE) {
496 delroute(&rrt->rrt_info, &rrt->rrt_gw);
497 }
498 }
499 close(ripsock);
500 close(rtsock);
501 syslog(LOG_INFO, "**** Terminated ****");
502 closelog();
503 exit(1);
504 }
505
506 /*
507 * Called periodically:
508 * 1. age out the learned route. remove it if necessary.
509 * 2. submit RIP6_RESPONSE packets.
510 * Invoked in every SUPPLY_INTERVAL6 (30) seconds. I believe we don't have
511 * to invoke this function in every 1 or 5 or 10 seconds only to age the
512 * routes more precisely.
513 */
514 /* ARGSUSED */
515 static void
ripalarm(void)516 ripalarm(void)
517 {
518 struct ifc *ifcp;
519 struct riprt *rrt, *rrt_prev, *rrt_next;
520 time_t t_lifetime, t_holddown;
521
522 /* age the RIP routes */
523 rrt_prev = NULL;
524 t_lifetime = time(NULL) - RIP_LIFETIME;
525 t_holddown = t_lifetime - RIP_HOLDDOWN;
526 for (rrt = riprt; rrt; rrt = rrt_next) {
527 rrt_next = rrt->rrt_next;
528
529 if (rrt->rrt_t == 0) {
530 rrt_prev = rrt;
531 continue;
532 }
533 if (rrt->rrt_t < t_holddown) {
534 if (rrt_prev) {
535 rrt_prev->rrt_next = rrt->rrt_next;
536 } else {
537 riprt = rrt->rrt_next;
538 }
539 delroute(&rrt->rrt_info, &rrt->rrt_gw);
540 free(rrt);
541 continue;
542 }
543 if (rrt->rrt_t < t_lifetime)
544 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
545 rrt_prev = rrt;
546 }
547 /* Supply updates */
548 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
549 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
550 ripsend(ifcp, &ifcp->ifc_ripsin, 0);
551 }
552 alarm(ripinterval(SUPPLY_INTERVAL6));
553 }
554
555 static void
init(void)556 init(void)
557 {
558 int i, int0, int255, error;
559 struct addrinfo hints, *res;
560 char port[10];
561
562 ifc = NULL;
563 nifc = 0;
564 nindex2ifc = 0; /*initial guess*/
565 index2ifc = NULL;
566 snprintf(port, sizeof(port), "%d", RIP6_PORT);
567
568 memset(&hints, 0, sizeof(hints));
569 hints.ai_family = PF_INET6;
570 hints.ai_socktype = SOCK_DGRAM;
571 hints.ai_flags = AI_PASSIVE;
572 error = getaddrinfo(NULL, port, &hints, &res);
573 if (error) {
574 fatal("%s", gai_strerror(error));
575 /*NOTREACHED*/
576 }
577 if (res->ai_next) {
578 fatal(":: resolved to multiple address");
579 /*NOTREACHED*/
580 }
581
582 int0 = 0; int255 = 255;
583 ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
584 if (ripsock < 0) {
585 fatal("rip socket");
586 /*NOTREACHED*/
587 }
588 if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) {
589 fatal("rip bind");
590 /*NOTREACHED*/
591 }
592 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
593 &int255, sizeof(int255)) < 0) {
594 fatal("rip IPV6_MULTICAST_HOPS");
595 /*NOTREACHED*/
596 }
597 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
598 &int0, sizeof(int0)) < 0) {
599 fatal("rip IPV6_MULTICAST_LOOP");
600 /*NOTREACHED*/
601 }
602
603 i = 1;
604 #ifdef IPV6_RECVPKTINFO
605 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i,
606 sizeof(i)) < 0) {
607 fatal("rip IPV6_RECVPKTINFO");
608 /*NOTREACHED*/
609 }
610 #else /* old adv. API */
611 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, &i,
612 sizeof(i)) < 0) {
613 fatal("rip IPV6_PKTINFO");
614 /*NOTREACHED*/
615 }
616 #endif
617
618 memset(&hints, 0, sizeof(hints));
619 hints.ai_family = PF_INET6;
620 hints.ai_socktype = SOCK_DGRAM;
621 error = getaddrinfo(RIP6_DEST, port, &hints, &res);
622 if (error) {
623 fatal("%s", gai_strerror(error));
624 /*NOTREACHED*/
625 }
626 if (res->ai_next) {
627 fatal("%s resolved to multiple address", RIP6_DEST);
628 /*NOTREACHED*/
629 }
630 memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
631
632 #ifdef FD_ZERO
633 FD_ZERO(&sockvec);
634 #else
635 memset(&sockvec, 0, sizeof(sockvec));
636 #endif
637 FD_SET(ripsock, &sockvec);
638
639 if (nflag == 0) {
640 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
641 fatal("route socket");
642 /*NOTREACHED*/
643 }
644 FD_SET(rtsock, &sockvec);
645 } else
646 rtsock = -1; /*just for safety */
647 }
648
649 #define RIPSIZE(n) \
650 (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6))
651
652 /*
653 * ripflush flushes the rip datagram stored in the rip buffer
654 */
655 static int nrt;
656 static struct netinfo6 *np;
657
658 static void
ripflush(struct ifc * ifcp,struct sockaddr_in6 * sin)659 ripflush(struct ifc *ifcp, struct sockaddr_in6 *sin)
660 {
661 int i;
662 int error;
663
664 if (ifcp)
665 tracet(1, "Send(%s): info(%d) to %s.%d\n",
666 ifcp->ifc_name, nrt,
667 inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port));
668 else
669 tracet(1, "Send: info(%d) to %s.%d\n",
670 nrt, inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port));
671 if (dflag >= 2) {
672 np = ripbuf->rip6_nets;
673 for (i = 0; i < nrt; i++, np++) {
674 if (np->rip6_metric == NEXTHOP_METRIC) {
675 if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest))
676 trace(2, " NextHop reset");
677 else {
678 trace(2, " NextHop %s",
679 inet6_n2p(&np->rip6_dest));
680 }
681 } else {
682 trace(2, " %s/%d[%d]",
683 inet6_n2p(&np->rip6_dest),
684 np->rip6_plen, np->rip6_metric);
685 }
686 if (np->rip6_tag) {
687 trace(2, " tag=0x%04x",
688 ntohs(np->rip6_tag) & 0xffff);
689 }
690 trace(2, "\n");
691 }
692 }
693 error = sendpacket(sin, RIPSIZE(nrt));
694 if (error == EAFNOSUPPORT) {
695 /* Protocol not supported */
696 tracet(1, "Could not send info to %s (%s): "
697 "set IFF_UP to 0\n",
698 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
699 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */
700 }
701 nrt = 0; np = ripbuf->rip6_nets;
702 }
703
704 /*
705 * Generate RIP6_RESPONSE packets and send them.
706 */
707 static void
ripsend(struct ifc * ifcp,struct sockaddr_in6 * sin,int flag)708 ripsend(struct ifc *ifcp, struct sockaddr_in6 *sin, int flag)
709 {
710 struct riprt *rrt;
711 struct in6_addr *nh; /* next hop */
712 int maxrte;
713
714 if (ifcp == NULL) {
715 /*
716 * Request from non-link local address is not
717 * a regular route6d update.
718 */
719 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) -
720 sizeof(struct udphdr) -
721 sizeof(struct rip6) + sizeof(struct netinfo6)) /
722 sizeof(struct netinfo6);
723 nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
724 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
725 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
726 continue;
727 /* Put the route to the buffer */
728 *np = rrt->rrt_info;
729 np++; nrt++;
730 if (nrt == maxrte) {
731 ripflush(NULL, sin);
732 nh = NULL;
733 }
734 }
735 if (nrt) /* Send last packet */
736 ripflush(NULL, sin);
737 return;
738 }
739
740 if ((flag & RRTF_SENDANYWAY) == 0 &&
741 (qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
742 return;
743
744 /* -N: no use */
745 if (iff_find(ifcp, 'N') != NULL)
746 return;
747
748 /* -T: generate default route only */
749 if (iff_find(ifcp, 'T') != NULL) {
750 struct netinfo6 rrt_info;
751 memset(&rrt_info, 0, sizeof(struct netinfo6));
752 rrt_info.rip6_dest = in6addr_any;
753 rrt_info.rip6_plen = 0;
754 rrt_info.rip6_metric = 1;
755 rrt_info.rip6_metric += ifcp->ifc_metric;
756 rrt_info.rip6_tag = htons(routetag & 0xffff);
757 np = ripbuf->rip6_nets;
758 *np = rrt_info;
759 nrt = 1;
760 ripflush(ifcp, sin);
761 return;
762 }
763
764 maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) -
765 sizeof(struct udphdr) -
766 sizeof(struct rip6) + sizeof(struct netinfo6)) /
767 sizeof(struct netinfo6);
768
769 nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
770 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
771 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
772 continue;
773
774 /* Need to check filter here */
775 if (out_filter(rrt, ifcp) == 0)
776 continue;
777
778 /* Check split horizon and other conditions */
779 if (tobeadv(rrt, ifcp) == 0)
780 continue;
781
782 /* Only considers the routes with flag if specified */
783 if ((flag & RRTF_CHANGED) &&
784 (rrt->rrt_rflags & RRTF_CHANGED) == 0)
785 continue;
786
787 /* Check nexthop */
788 if (rrt->rrt_index == ifcp->ifc_index &&
789 !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) &&
790 (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) {
791 if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) {
792 if (nrt == maxrte - 2)
793 ripflush(ifcp, sin);
794 np->rip6_dest = rrt->rrt_gw;
795 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest))
796 SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0);
797 np->rip6_plen = 0;
798 np->rip6_tag = 0;
799 np->rip6_metric = NEXTHOP_METRIC;
800 nh = &rrt->rrt_gw;
801 np++; nrt++;
802 }
803 } else if (nh && (rrt->rrt_index != ifcp->ifc_index ||
804 !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) ||
805 rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) {
806 /* Reset nexthop */
807 if (nrt == maxrte - 2)
808 ripflush(ifcp, sin);
809 memset(np, 0, sizeof(struct netinfo6));
810 np->rip6_metric = NEXTHOP_METRIC;
811 nh = NULL;
812 np++; nrt++;
813 }
814
815 /* Put the route to the buffer */
816 *np = rrt->rrt_info;
817 np++; nrt++;
818 if (nrt == maxrte) {
819 ripflush(ifcp, sin);
820 nh = NULL;
821 }
822 }
823 if (nrt) /* Send last packet */
824 ripflush(ifcp, sin);
825 }
826
827 /*
828 * outbound filter logic, per-route/interface.
829 */
830 static int
out_filter(struct riprt * rrt,struct ifc * ifcp)831 out_filter(struct riprt *rrt, struct ifc *ifcp)
832 {
833 struct iff *iffp;
834 struct in6_addr ia;
835 int ok;
836
837 /*
838 * -A: filter out less specific routes, if we have aggregated
839 * route configured.
840 */
841 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
842 if (iffp->iff_type != 'A')
843 continue;
844 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen)
845 continue;
846 ia = rrt->rrt_info.rip6_dest;
847 applyplen(&ia, iffp->iff_plen);
848 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr))
849 return 0;
850 }
851
852 /*
853 * if it is an aggregated route, advertise it only to the
854 * interfaces specified on -A.
855 */
856 if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) {
857 ok = 0;
858 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
859 if (iffp->iff_type != 'A')
860 continue;
861 if (rrt->rrt_info.rip6_plen == iffp->iff_plen &&
862 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
863 &iffp->iff_addr)) {
864 ok = 1;
865 break;
866 }
867 }
868 if (!ok)
869 return 0;
870 }
871
872 /*
873 * -O: advertise only if prefix matches the configured prefix.
874 */
875 if (iff_find(ifcp, 'O')) {
876 ok = 0;
877 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
878 if (iffp->iff_type != 'O')
879 continue;
880 if (rrt->rrt_info.rip6_plen < iffp->iff_plen)
881 continue;
882 ia = rrt->rrt_info.rip6_dest;
883 applyplen(&ia, iffp->iff_plen);
884 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
885 ok = 1;
886 break;
887 }
888 }
889 if (!ok)
890 return 0;
891 }
892
893 /* the prefix should be advertised */
894 return 1;
895 }
896
897 /*
898 * Determine if the route is to be advertised on the specified interface.
899 * It checks options specified in the arguments and the split horizon rule.
900 */
901 static int
tobeadv(struct riprt * rrt,struct ifc * ifcp)902 tobeadv(struct riprt *rrt, struct ifc *ifcp)
903 {
904
905 /* Special care for static routes */
906 if (rrt->rrt_flags & RTF_STATIC) {
907 /* XXX don't advertise reject/blackhole routes */
908 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE))
909 return 0;
910
911 if (Sflag) /* Yes, advertise it anyway */
912 return 1;
913 if (sflag && rrt->rrt_index != ifcp->ifc_index)
914 return 1;
915 return 0;
916 }
917 /* Regular split horizon */
918 if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index)
919 return 0;
920 return 1;
921 }
922
923 /*
924 * Send a rip packet actually.
925 */
926 static int
sendpacket(struct sockaddr_in6 * sin,int len)927 sendpacket(struct sockaddr_in6 *sin, int len)
928 {
929 /*
930 * MSG_DONTROUTE should not be specified when it responds with a
931 * RIP6_REQUEST message. SO_DONTROUTE has been specified to
932 * other sockets.
933 */
934 struct msghdr m;
935 struct cmsghdr *cm;
936 struct iovec iov[2];
937 u_char cmsgbuf[256];
938 struct in6_pktinfo *pi;
939 int idx;
940 struct sockaddr_in6 sincopy;
941
942 /* do not overwrite the given sin */
943 sincopy = *sin;
944 sin = &sincopy;
945
946 if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr)
947 || IN6_IS_ADDR_MULTICAST(&sin->sin6_addr)) {
948 idx = IN6_LINKLOCAL_IFINDEX(sin->sin6_addr);
949 SET_IN6_LINKLOCAL_IFINDEX(sin->sin6_addr, 0);
950 } else
951 idx = 0;
952
953 m.msg_name = (caddr_t)sin;
954 m.msg_namelen = sizeof(*sin);
955 iov[0].iov_base = (caddr_t)ripbuf;
956 iov[0].iov_len = len;
957 m.msg_iov = iov;
958 m.msg_iovlen = 1;
959 if (!idx) {
960 m.msg_control = NULL;
961 m.msg_controllen = 0;
962 } else {
963 memset(cmsgbuf, 0, sizeof(cmsgbuf));
964 cm = (struct cmsghdr *)cmsgbuf;
965 m.msg_control = (caddr_t)cm;
966 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
967
968 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
969 cm->cmsg_level = IPPROTO_IPV6;
970 cm->cmsg_type = IPV6_PKTINFO;
971 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
972 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/
973 pi->ipi6_ifindex = idx;
974 }
975
976 if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) {
977 trace(1, "sendmsg: %s\n", strerror(errno));
978 return errno;
979 }
980
981 return 0;
982 }
983
984 /*
985 * Receive and process RIP packets. Update the routes/kernel forwarding
986 * table if necessary.
987 */
988 static void
riprecv(void)989 riprecv(void)
990 {
991 struct ifc *ifcp, *ic;
992 struct sockaddr_in6 fsock;
993 struct in6_addr nh; /* next hop */
994 struct rip6 *rp;
995 struct netinfo6 *np, *nq;
996 struct riprt *rrt;
997 int len, nn, need_trigger, idx;
998 char buf[4 * RIP6_MAXMTU];
999 time_t t;
1000 struct msghdr m;
1001 struct cmsghdr *cm;
1002 struct iovec iov[2];
1003 u_char cmsgbuf[256];
1004 struct in6_pktinfo *pi;
1005 struct iff *iffp;
1006 struct in6_addr ia;
1007 int ok;
1008 time_t t_half_lifetime;
1009
1010 need_trigger = 0;
1011
1012 m.msg_name = (caddr_t)&fsock;
1013 m.msg_namelen = sizeof(fsock);
1014 iov[0].iov_base = (caddr_t)buf;
1015 iov[0].iov_len = sizeof(buf);
1016 m.msg_iov = iov;
1017 m.msg_iovlen = 1;
1018 cm = (struct cmsghdr *)cmsgbuf;
1019 m.msg_control = (caddr_t)cm;
1020 m.msg_controllen = sizeof(cmsgbuf);
1021 if ((len = recvmsg(ripsock, &m, 0)) < 0) {
1022 fatal("recvmsg");
1023 /*NOTREACHED*/
1024 }
1025 idx = 0;
1026 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
1027 cm;
1028 cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
1029 if (cm->cmsg_level == IPPROTO_IPV6 &&
1030 cm->cmsg_type == IPV6_PKTINFO) {
1031 pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
1032 idx = pi->ipi6_ifindex;
1033 break;
1034 }
1035 }
1036 if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr))
1037 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx);
1038
1039 nh = fsock.sin6_addr;
1040 nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) /
1041 sizeof(struct netinfo6);
1042 rp = (struct rip6 *)buf;
1043 np = rp->rip6_nets;
1044
1045 if (rp->rip6_vers != RIP6_VERSION) {
1046 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers);
1047 return;
1048 }
1049 if (rp->rip6_cmd == RIP6_REQUEST) {
1050 if (idx && idx < nindex2ifc) {
1051 ifcp = index2ifc[idx];
1052 riprequest(ifcp, np, nn, &fsock);
1053 } else {
1054 riprequest(NULL, np, nn, &fsock);
1055 }
1056 return;
1057 }
1058
1059 if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) {
1060 trace(1, "Packets from non-ll addr: %s\n",
1061 inet6_n2p(&fsock.sin6_addr));
1062 return; /* Ignore packets from non-link-local addr */
1063 }
1064 idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr);
1065 ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL;
1066 if (!ifcp) {
1067 trace(1, "Packets to unknown interface index %d\n", idx);
1068 return; /* Ignore it */
1069 }
1070 if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr))
1071 return; /* The packet is from me; ignore */
1072 if (rp->rip6_cmd != RIP6_RESPONSE) {
1073 trace(1, "Invalid command %d\n", rp->rip6_cmd);
1074 return;
1075 }
1076
1077 /* -N: no use */
1078 if (iff_find(ifcp, 'N') != NULL)
1079 return;
1080
1081 tracet(1, "Recv(%s): from %s.%d info(%d)\n",
1082 ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn);
1083
1084 t = time(NULL);
1085 t_half_lifetime = t - (RIP_LIFETIME/2);
1086 for (; nn; nn--, np++) {
1087 if (np->rip6_metric == NEXTHOP_METRIC) {
1088 /* modify neighbor address */
1089 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1090 nh = np->rip6_dest;
1091 SET_IN6_LINKLOCAL_IFINDEX(nh, idx);
1092 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1093 } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) {
1094 nh = fsock.sin6_addr;
1095 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1096 } else {
1097 nh = fsock.sin6_addr;
1098 trace(1, "\tInvalid Nexthop: %s\n",
1099 inet6_n2p(&np->rip6_dest));
1100 }
1101 continue;
1102 }
1103 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) {
1104 trace(1, "\tMulticast netinfo6: %s/%d [%d]\n",
1105 inet6_n2p(&np->rip6_dest),
1106 np->rip6_plen, np->rip6_metric);
1107 continue;
1108 }
1109 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) {
1110 trace(1, "\tLoopback netinfo6: %s/%d [%d]\n",
1111 inet6_n2p(&np->rip6_dest),
1112 np->rip6_plen, np->rip6_metric);
1113 continue;
1114 }
1115 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1116 trace(1, "\tLink Local netinfo6: %s/%d [%d]\n",
1117 inet6_n2p(&np->rip6_dest),
1118 np->rip6_plen, np->rip6_metric);
1119 continue;
1120 }
1121 /* may need to pass sitelocal prefix in some case, however*/
1122 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) {
1123 trace(1, "\tSite Local netinfo6: %s/%d [%d]\n",
1124 inet6_n2p(&np->rip6_dest),
1125 np->rip6_plen, np->rip6_metric);
1126 continue;
1127 }
1128 trace(2, "\tnetinfo6: %s/%d [%d]",
1129 inet6_n2p(&np->rip6_dest),
1130 np->rip6_plen, np->rip6_metric);
1131 if (np->rip6_tag)
1132 trace(2, " tag=0x%04x", ntohs(np->rip6_tag) & 0xffff);
1133 if (dflag >= 2) {
1134 ia = np->rip6_dest;
1135 applyplen(&ia, np->rip6_plen);
1136 if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest))
1137 trace(2, " [junk outside prefix]");
1138 }
1139
1140 /*
1141 * -L: listen only if the prefix matches the configuration
1142 */
1143 ok = 1; /* if there's no L filter, it is ok */
1144 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
1145 if (iffp->iff_type != 'L')
1146 continue;
1147 ok = 0;
1148 if (np->rip6_plen < iffp->iff_plen)
1149 continue;
1150 /* special rule: ::/0 means default, not "in /0" */
1151 if (iffp->iff_plen == 0 && np->rip6_plen > 0)
1152 continue;
1153 ia = np->rip6_dest;
1154 applyplen(&ia, iffp->iff_plen);
1155 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
1156 ok = 1;
1157 break;
1158 }
1159 }
1160 if (!ok) {
1161 trace(2, " (filtered)\n");
1162 continue;
1163 }
1164
1165 trace(2, "\n");
1166 np->rip6_metric++;
1167 np->rip6_metric += ifcp->ifc_metric;
1168 if (np->rip6_metric > HOPCNT_INFINITY6)
1169 np->rip6_metric = HOPCNT_INFINITY6;
1170
1171 applyplen(&np->rip6_dest, np->rip6_plen);
1172 if ((rrt = rtsearch(np, NULL)) != NULL) {
1173 if (rrt->rrt_t == 0)
1174 continue; /* Intf route has priority */
1175 nq = &rrt->rrt_info;
1176 if (nq->rip6_metric > np->rip6_metric) {
1177 if (rrt->rrt_index == ifcp->ifc_index &&
1178 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1179 /* Small metric from the same gateway */
1180 nq->rip6_metric = np->rip6_metric;
1181 } else {
1182 /* Better route found */
1183 rrt->rrt_index = ifcp->ifc_index;
1184 /* Update routing table */
1185 delroute(nq, &rrt->rrt_gw);
1186 rrt->rrt_gw = nh;
1187 *nq = *np;
1188 addroute(rrt, &nh, ifcp);
1189 }
1190 rrt->rrt_rflags |= RRTF_CHANGED;
1191 rrt->rrt_t = t;
1192 need_trigger = 1;
1193 } else if (nq->rip6_metric < np->rip6_metric &&
1194 rrt->rrt_index == ifcp->ifc_index &&
1195 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1196 /* Got worse route from same gw */
1197 nq->rip6_metric = np->rip6_metric;
1198 rrt->rrt_t = t;
1199 rrt->rrt_rflags |= RRTF_CHANGED;
1200 need_trigger = 1;
1201 } else if (nq->rip6_metric == np->rip6_metric &&
1202 np->rip6_metric < HOPCNT_INFINITY6) {
1203 if (rrt->rrt_index == ifcp->ifc_index &&
1204 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1205 /* same metric, same route from same gw */
1206 rrt->rrt_t = t;
1207 } else if (rrt->rrt_t < t_half_lifetime) {
1208 /* Better route found */
1209 rrt->rrt_index = ifcp->ifc_index;
1210 /* Update routing table */
1211 delroute(nq, &rrt->rrt_gw);
1212 rrt->rrt_gw = nh;
1213 *nq = *np;
1214 addroute(rrt, &nh, ifcp);
1215 rrt->rrt_rflags |= RRTF_CHANGED;
1216 rrt->rrt_t = t;
1217 }
1218 }
1219 /*
1220 * if nq->rip6_metric == HOPCNT_INFINITY6 then
1221 * do not update age value. Do nothing.
1222 */
1223 } else if (np->rip6_metric < HOPCNT_INFINITY6) {
1224 /* Got a new valid route */
1225 if ((rrt = MALLOC(struct riprt)) == NULL) {
1226 fatal("malloc: struct riprt");
1227 /*NOTREACHED*/
1228 }
1229 memset(rrt, 0, sizeof(*rrt));
1230 nq = &rrt->rrt_info;
1231
1232 rrt->rrt_same = NULL;
1233 rrt->rrt_index = ifcp->ifc_index;
1234 rrt->rrt_flags = RTF_UP|RTF_GATEWAY;
1235 rrt->rrt_gw = nh;
1236 *nq = *np;
1237 applyplen(&nq->rip6_dest, nq->rip6_plen);
1238 if (nq->rip6_plen == sizeof(struct in6_addr) * 8)
1239 rrt->rrt_flags |= RTF_HOST;
1240
1241 /* Put the route to the list */
1242 rrt->rrt_next = riprt;
1243 riprt = rrt;
1244 /* Update routing table */
1245 addroute(rrt, &nh, ifcp);
1246 rrt->rrt_rflags |= RRTF_CHANGED;
1247 need_trigger = 1;
1248 rrt->rrt_t = t;
1249 }
1250 }
1251 /* XXX need to care the interval between triggered updates */
1252 if (need_trigger) {
1253 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) {
1254 for (ic = ifc; ic; ic = ic->ifc_next) {
1255 if (ifcp->ifc_index == ic->ifc_index)
1256 continue;
1257 if (ic->ifc_flags & IFF_UP)
1258 ripsend(ic, &ic->ifc_ripsin,
1259 RRTF_CHANGED);
1260 }
1261 }
1262 /* Reset the flag */
1263 for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1264 rrt->rrt_rflags &= ~RRTF_CHANGED;
1265 }
1266 }
1267
1268 /*
1269 * Send all routes request packet to the specified interface.
1270 */
1271 static void
sendrequest(struct ifc * ifcp)1272 sendrequest(struct ifc *ifcp)
1273 {
1274 struct netinfo6 *np;
1275 int error;
1276
1277 if (ifcp->ifc_flags & IFF_LOOPBACK)
1278 return;
1279 ripbuf->rip6_cmd = RIP6_REQUEST;
1280 np = ripbuf->rip6_nets;
1281 memset(np, 0, sizeof(struct netinfo6));
1282 np->rip6_metric = HOPCNT_INFINITY6;
1283 tracet(1, "Send rtdump Request to %s (%s)\n",
1284 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1285 error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
1286 if (error == EAFNOSUPPORT) {
1287 /* Protocol not supported */
1288 tracet(1, "Could not send rtdump Request to %s (%s): "
1289 "set IFF_UP to 0\n",
1290 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1291 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */
1292 }
1293 ripbuf->rip6_cmd = RIP6_RESPONSE;
1294 }
1295
1296 /*
1297 * Process a RIP6_REQUEST packet.
1298 */
1299 static void
riprequest(struct ifc * ifcp,struct netinfo6 * np,int nn,struct sockaddr_in6 * sin)1300 riprequest(struct ifc *ifcp, struct netinfo6 *np, int nn,
1301 struct sockaddr_in6 *sin)
1302 {
1303 int i;
1304 struct riprt *rrt;
1305
1306 if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) &&
1307 np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) {
1308 /* Specific response, don't split-horizon */
1309 trace(1, "\tRIP Request\n");
1310 for (i = 0; i < nn; i++, np++) {
1311 rrt = rtsearch(np, NULL);
1312 if (rrt)
1313 np->rip6_metric = rrt->rrt_info.rip6_metric;
1314 else
1315 np->rip6_metric = HOPCNT_INFINITY6;
1316 }
1317 sendpacket(sin, RIPSIZE(nn));
1318 return;
1319 }
1320 /* Whole routing table dump */
1321 trace(1, "\tRIP Request -- whole routing table\n");
1322 ripsend(ifcp, sin, RRTF_SENDANYWAY);
1323 }
1324
1325 /*
1326 * Get information of each interface.
1327 */
1328 static void
ifconfig(void)1329 ifconfig(void)
1330 {
1331 struct ifaddrs *ifap, *ifa;
1332 struct ifc *ifcp;
1333 struct ipv6_mreq mreq;
1334 int s;
1335
1336 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
1337 fatal("socket");
1338 /*NOTREACHED*/
1339 }
1340
1341 if (getifaddrs(&ifap) != 0) {
1342 fatal("getifaddrs");
1343 /*NOTREACHED*/
1344 }
1345
1346 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1347 if (ifa->ifa_addr->sa_family != AF_INET6)
1348 continue;
1349 ifcp = ifc_find(ifa->ifa_name);
1350 /* we are interested in multicast-capable interfaces */
1351 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
1352 continue;
1353 if (!ifcp) {
1354 /* new interface */
1355 if ((ifcp = MALLOC(struct ifc)) == NULL) {
1356 fatal("malloc: struct ifc");
1357 /*NOTREACHED*/
1358 }
1359 memset(ifcp, 0, sizeof(*ifcp));
1360 ifcp->ifc_index = -1;
1361 ifcp->ifc_next = ifc;
1362 ifc = ifcp;
1363 nifc++;
1364 ifcp->ifc_name = allocopy(ifa->ifa_name);
1365 ifcp->ifc_addr = NULL;
1366 ifcp->ifc_filter = NULL;
1367 ifcp->ifc_flags = ifa->ifa_flags;
1368 trace(1, "newif %s <%s>\n", ifcp->ifc_name,
1369 ifflags(ifcp->ifc_flags));
1370 if (!strcmp(ifcp->ifc_name, LOOPBACK_IF))
1371 loopifcp = ifcp;
1372 } else {
1373 /* update flag, this may be up again */
1374 if (ifcp->ifc_flags != ifa->ifa_flags) {
1375 trace(1, "%s: <%s> -> ", ifcp->ifc_name,
1376 ifflags(ifcp->ifc_flags));
1377 trace(1, "<%s>\n", ifflags(ifa->ifa_flags));
1378 ifcp->ifc_cflags |= IFC_CHANGED;
1379 }
1380 ifcp->ifc_flags = ifa->ifa_flags;
1381 }
1382 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s);
1383 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP
1384 && 0 < ifcp->ifc_index && !ifcp->ifc_joined) {
1385 mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr;
1386 mreq.ipv6mr_interface = ifcp->ifc_index;
1387 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1388 &mreq, sizeof(mreq)) < 0) {
1389 fatal("IPV6_JOIN_GROUP");
1390 /*NOTREACHED*/
1391 }
1392 trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST);
1393 ifcp->ifc_joined++;
1394 }
1395 }
1396 close(s);
1397 freeifaddrs(ifap);
1398 }
1399
1400 static void
ifconfig1(const char * name,const struct sockaddr * sa,struct ifc * ifcp,int s)1401 ifconfig1(const char *name, const struct sockaddr *sa, struct ifc *ifcp, int s)
1402 {
1403 struct in6_ifreq ifr;
1404 const struct sockaddr_in6 *sin;
1405 struct ifac *ifa;
1406 int plen;
1407 char buf[BUFSIZ];
1408
1409 sin = (const struct sockaddr_in6 *)sa;
1410 ifr.ifr_addr = *sin;
1411 strcpy(ifr.ifr_name, name);
1412 if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) {
1413 fatal("ioctl: SIOCGIFNETMASK_IN6");
1414 /*NOTREACHED*/
1415 }
1416 plen = sin6mask2len(&ifr.ifr_addr);
1417 if ((ifa = ifa_match(ifcp, &sin->sin6_addr, plen)) != NULL) {
1418 /* same interface found */
1419 /* need check if something changed */
1420 /* XXX not yet implemented */
1421 return;
1422 }
1423 /*
1424 * New address is found
1425 */
1426 if ((ifa = MALLOC(struct ifac)) == NULL) {
1427 fatal("malloc: struct ifac");
1428 /*NOTREACHED*/
1429 }
1430 memset(ifa, 0, sizeof(*ifa));
1431 ifa->ifa_conf = ifcp;
1432 ifa->ifa_next = ifcp->ifc_addr;
1433 ifcp->ifc_addr = ifa;
1434 ifa->ifa_addr = sin->sin6_addr;
1435 ifa->ifa_plen = plen;
1436 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1437 ifr.ifr_addr = *sin;
1438 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) {
1439 fatal("ioctl: SIOCGIFDSTADDR_IN6");
1440 /*NOTREACHED*/
1441 }
1442 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr;
1443 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf));
1444 trace(1, "found address %s/%d -- %s\n",
1445 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf);
1446 } else {
1447 trace(1, "found address %s/%d\n",
1448 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen);
1449 }
1450 if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1451 ifcp->ifc_mylladdr = ifa->ifa_addr;
1452 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr);
1453 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len);
1454 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr,
1455 ifcp->ifc_index);
1456 setindex2ifc(ifcp->ifc_index, ifcp);
1457 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index);
1458 if (ifcp->ifc_mtu > RIP6_MAXMTU)
1459 ifcp->ifc_mtu = RIP6_MAXMTU;
1460 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) {
1461 fatal("ioctl: SIOCGIFMETRIC");
1462 /*NOTREACHED*/
1463 }
1464 ifcp->ifc_metric = ifr.ifr_metric;
1465 trace(1, "\tindex: %d, mtu: %d, metric: %d\n",
1466 ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric);
1467 } else
1468 ifcp->ifc_cflags |= IFC_CHANGED;
1469 }
1470
1471 /*
1472 * Receive and process routing messages.
1473 * Update interface information as necesssary.
1474 */
1475 static void
rtrecv(void)1476 rtrecv(void)
1477 {
1478 char buf[BUFSIZ];
1479 char *p, *q;
1480 struct rt_msghdr *rtm;
1481 struct ifa_msghdr *ifam;
1482 struct if_msghdr *ifm;
1483 int len;
1484 struct ifc *ifcp, *ic;
1485 int iface = 0, rtable = 0;
1486 struct sockaddr_in6 *rta[RTAX_MAX];
1487 struct sockaddr_in6 mask;
1488 int i, addrs;
1489 struct riprt *rrt;
1490
1491 if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
1492 perror("read from rtsock");
1493 exit(1);
1494 }
1495 if (len < sizeof(*rtm)) {
1496 trace(1, "short read from rtsock: %d (should be > %lu)\n",
1497 len, (u_long)sizeof(*rtm));
1498 return;
1499 }
1500
1501 for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) {
1502 /* safety against bogus message */
1503 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) {
1504 trace(1, "bogus rtmsg: length=%d\n",
1505 ((struct rt_msghdr *)p)->rtm_msglen);
1506 break;
1507 }
1508 rtm = NULL;
1509 ifam = NULL;
1510 ifm = NULL;
1511 switch (((struct rt_msghdr *)p)->rtm_type) {
1512 case RTM_NEWADDR:
1513 case RTM_DELADDR:
1514 ifam = (struct ifa_msghdr *)p;
1515 addrs = ifam->ifam_addrs;
1516 q = (char *)(ifam + 1);
1517 break;
1518 case RTM_IFINFO:
1519 ifm = (struct if_msghdr *)p;
1520 addrs = ifm->ifm_addrs;
1521 q = (char *)(ifm + 1);
1522 break;
1523 default:
1524 rtm = (struct rt_msghdr *)p;
1525 addrs = rtm->rtm_addrs;
1526 q = (char *)(rtm + 1);
1527 if (rtm->rtm_version != RTM_VERSION) {
1528 trace(1, "unexpected rtmsg version %d "
1529 "(should be %d)\n",
1530 rtm->rtm_version, RTM_VERSION);
1531 continue;
1532 }
1533 if (rtm->rtm_pid == pid) {
1534 #if 0
1535 trace(1, "rtmsg looped back to me, ignored\n");
1536 #endif
1537 continue;
1538 }
1539 break;
1540 }
1541 memset(&rta, 0, sizeof(rta));
1542 for (i = 0; i < RTAX_MAX; i++) {
1543 if (addrs & (1 << i)) {
1544 rta[i] = (struct sockaddr_in6 *)q;
1545 q += RT_ROUNDUP(rta[i]->sin6_len);
1546 }
1547 }
1548
1549 trace(1, "rtsock: %s (addrs=%x)\n",
1550 rttypes((struct rt_msghdr *)p), addrs);
1551 if (dflag >= 2) {
1552 for (i = 0;
1553 i < ((struct rt_msghdr *)p)->rtm_msglen;
1554 i++) {
1555 fprintf(stderr, "%02x ", p[i] & 0xff);
1556 if (i % 16 == 15) fprintf(stderr, "\n");
1557 }
1558 fprintf(stderr, "\n");
1559 }
1560
1561 /*
1562 * Easy ones first.
1563 *
1564 * We may be able to optimize by using ifm->ifm_index or
1565 * ifam->ifam_index. For simplicity we don't do that here.
1566 */
1567 switch (((struct rt_msghdr *)p)->rtm_type) {
1568 case RTM_NEWADDR:
1569 case RTM_IFINFO:
1570 iface++;
1571 continue;
1572 case RTM_ADD:
1573 rtable++;
1574 continue;
1575 case RTM_LOSING:
1576 case RTM_MISS:
1577 case RTM_RESOLVE:
1578 case RTM_GET:
1579 case RTM_LOCK:
1580 /* nothing to be done here */
1581 trace(1, "\tnothing to be done, ignored\n");
1582 continue;
1583 }
1584
1585 #if 0
1586 if (rta[RTAX_DST] == NULL) {
1587 trace(1, "\tno destination, ignored\n");
1588 continue;
1589 }
1590 if (rta[RTAX_DST]->sin6_family != AF_INET6) {
1591 trace(1, "\taf mismatch, ignored\n");
1592 continue;
1593 }
1594 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) {
1595 trace(1, "\tlinklocal destination, ignored\n");
1596 continue;
1597 }
1598 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) {
1599 trace(1, "\tloopback destination, ignored\n");
1600 continue; /* Loopback */
1601 }
1602 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) {
1603 trace(1, "\tmulticast destination, ignored\n");
1604 continue;
1605 }
1606 #endif
1607
1608 /* hard ones */
1609 switch (((struct rt_msghdr *)p)->rtm_type) {
1610 case RTM_NEWADDR:
1611 case RTM_IFINFO:
1612 case RTM_ADD:
1613 case RTM_LOSING:
1614 case RTM_MISS:
1615 case RTM_RESOLVE:
1616 case RTM_GET:
1617 case RTM_LOCK:
1618 /* should already be handled */
1619 fatal("rtrecv: never reach here");
1620 /*NOTREACHED*/
1621 case RTM_DELETE:
1622 if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) {
1623 trace(1, "\tsome of dst/gw/netamsk are "
1624 "unavailable, ignored\n");
1625 break;
1626 }
1627 if ((rtm->rtm_flags & RTF_HOST) != 0) {
1628 mask.sin6_len = sizeof(mask);
1629 memset(&mask.sin6_addr, 0xff,
1630 sizeof(mask.sin6_addr));
1631 rta[RTAX_NETMASK] = &mask;
1632 } else if (!rta[RTAX_NETMASK]) {
1633 trace(1, "\tsome of dst/gw/netamsk are "
1634 "unavailable, ignored\n");
1635 break;
1636 }
1637 if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY],
1638 rta[RTAX_NETMASK]) == 0) {
1639 rtable++; /*just to be sure*/
1640 }
1641 break;
1642 case RTM_CHANGE:
1643 case RTM_REDIRECT:
1644 trace(1, "\tnot supported yet, ignored\n");
1645 break;
1646 case RTM_DELADDR:
1647 if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) {
1648 trace(1, "\tno netmask or ifa given, ignored\n");
1649 break;
1650 }
1651 if (ifam->ifam_index < nindex2ifc)
1652 ifcp = index2ifc[ifam->ifam_index];
1653 else
1654 ifcp = NULL;
1655 if (!ifcp) {
1656 trace(1, "\tinvalid ifam_index %d, ignored\n",
1657 ifam->ifam_index);
1658 break;
1659 }
1660 if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK]))
1661 iface++;
1662 break;
1663 default:
1664 trace(1, "\tnot supported yet, ignored\n");
1665 break;
1666 }
1667
1668 }
1669
1670 if (iface) {
1671 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n");
1672 ifconfig();
1673 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
1674 if (ifcp->ifc_cflags & IFC_CHANGED) {
1675 if (ifrt(ifcp, 1)) {
1676 for (ic = ifc; ic; ic = ic->ifc_next) {
1677 if (ifcp->ifc_index == ic->ifc_index)
1678 continue;
1679 if (ic->ifc_flags & IFF_UP)
1680 ripsend(ic, &ic->ifc_ripsin,
1681 RRTF_CHANGED);
1682 }
1683 /* Reset the flag */
1684 for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1685 rrt->rrt_rflags &= ~RRTF_CHANGED;
1686 }
1687 ifcp->ifc_cflags &= ~IFC_CHANGED;
1688 }
1689 }
1690 if (rtable) {
1691 trace(1, "rtsock: read routing table again\n");
1692 krtread(1);
1693 }
1694 }
1695
1696 /*
1697 * remove specified route from the internal routing table.
1698 */
1699 static int
rt_del(const struct sockaddr_in6 * sdst,const struct sockaddr_in6 * sgw,const struct sockaddr_in6 * smask)1700 rt_del(const struct sockaddr_in6 *sdst, const struct sockaddr_in6 *sgw,
1701 const struct sockaddr_in6 *smask)
1702 {
1703 const struct in6_addr *dst = NULL;
1704 const struct in6_addr *gw = NULL;
1705 int prefix;
1706 struct netinfo6 ni6;
1707 struct riprt *rrt = NULL;
1708 time_t t_lifetime;
1709
1710 if (sdst->sin6_family != AF_INET6) {
1711 trace(1, "\tother AF, ignored\n");
1712 return -1;
1713 }
1714 if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr)
1715 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback)
1716 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) {
1717 trace(1, "\taddress %s not interesting, ignored\n",
1718 inet6_n2p(&sdst->sin6_addr));
1719 return -1;
1720 }
1721 dst = &sdst->sin6_addr;
1722 if (sgw->sin6_family == AF_INET6) {
1723 /* easy case */
1724 gw = &sgw->sin6_addr;
1725 prefix = sin6mask2len(smask);
1726 } else if (sgw->sin6_family == AF_LINK) {
1727 /*
1728 * Interface route... a hard case. We need to get the prefix
1729 * length from the kernel, but we now are parsing rtmsg.
1730 * We'll purge matching routes from my list, then get the
1731 * fresh list.
1732 */
1733 struct riprt *longest;
1734 trace(1, "\t%s is an interface route, guessing prefixlen\n",
1735 inet6_n2p(dst));
1736 longest = NULL;
1737 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
1738 if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
1739 &sdst->sin6_addr)
1740 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
1741 if (!longest
1742 || longest->rrt_info.rip6_plen <
1743 rrt->rrt_info.rip6_plen) {
1744 longest = rrt;
1745 }
1746 }
1747 }
1748 rrt = longest;
1749 if (!rrt) {
1750 trace(1, "\tno matching interface route found\n");
1751 return -1;
1752 }
1753 gw = &in6addr_loopback;
1754 prefix = rrt->rrt_info.rip6_plen;
1755 } else {
1756 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family);
1757 return -1;
1758 }
1759
1760 trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix);
1761 trace(1, "gw %s\n", inet6_n2p(gw));
1762 t_lifetime = time(NULL) - RIP_LIFETIME;
1763 /* age route for interface address */
1764 memset(&ni6, 0, sizeof(ni6));
1765 ni6.rip6_dest = *dst;
1766 ni6.rip6_plen = prefix;
1767 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/
1768 trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest),
1769 ni6.rip6_plen);
1770 if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) {
1771 trace(1, "\tno route found\n");
1772 return -1;
1773 }
1774 #if 0
1775 if ((rrt->rrt_flags & RTF_STATIC) == 0) {
1776 trace(1, "\tyou can delete static routes only\n");
1777 } else
1778 #endif
1779 if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) {
1780 trace(1, "\tgw mismatch: %s <-> ",
1781 inet6_n2p(&rrt->rrt_gw));
1782 trace(1, "%s\n", inet6_n2p(gw));
1783 } else {
1784 trace(1, "\troute found, age it\n");
1785 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1786 rrt->rrt_t = t_lifetime;
1787 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1788 }
1789 }
1790 return 0;
1791 }
1792
1793 /*
1794 * remove specified address from internal interface/routing table.
1795 */
1796 static int
rt_deladdr(struct ifc * ifcp,const struct sockaddr_in6 * sifa,const struct sockaddr_in6 * smask)1797 rt_deladdr(struct ifc *ifcp, const struct sockaddr_in6 *sifa,
1798 const struct sockaddr_in6 *smask)
1799 {
1800 const struct in6_addr *addr = NULL;
1801 int prefix;
1802 struct ifac *ifa = NULL;
1803 struct netinfo6 ni6;
1804 struct riprt *rrt = NULL;
1805 time_t t_lifetime;
1806 int updated = 0;
1807
1808 if (sifa->sin6_family != AF_INET6) {
1809 trace(1, "\tother AF, ignored\n");
1810 return -1;
1811 }
1812 addr = &sifa->sin6_addr;
1813 prefix = sin6mask2len(smask);
1814
1815 trace(1, "\tdeleting %s/%d from %s\n",
1816 inet6_n2p(addr), prefix, ifcp->ifc_name);
1817 ifa = ifa_match(ifcp, addr, prefix);
1818 if (!ifa) {
1819 trace(1, "\tno matching ifa found for %s/%d on %s\n",
1820 inet6_n2p(addr), prefix, ifcp->ifc_name);
1821 return -1;
1822 }
1823 if (ifa->ifa_conf != ifcp) {
1824 trace(1, "\taddress table corrupt: back pointer does not match "
1825 "(%s != %s)\n",
1826 ifcp->ifc_name, ifa->ifa_conf->ifc_name);
1827 return -1;
1828 }
1829 /* remove ifa from interface */
1830 if (ifcp->ifc_addr == ifa)
1831 ifcp->ifc_addr = ifa->ifa_next;
1832 else {
1833 struct ifac *p;
1834 for (p = ifcp->ifc_addr; p; p = p->ifa_next) {
1835 if (p->ifa_next == ifa) {
1836 p->ifa_next = ifa->ifa_next;
1837 break;
1838 }
1839 }
1840 }
1841 ifa->ifa_next = NULL;
1842 ifa->ifa_conf = NULL;
1843 t_lifetime = time(NULL) - RIP_LIFETIME;
1844 /* age route for interface address */
1845 memset(&ni6, 0, sizeof(ni6));
1846 ni6.rip6_dest = ifa->ifa_addr;
1847 ni6.rip6_plen = ifa->ifa_plen;
1848 applyplen(&ni6.rip6_dest, ni6.rip6_plen);
1849 trace(1, "\tfind interface route %s/%d on %d\n",
1850 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index);
1851 if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1852 struct in6_addr none;
1853 memset(&none, 0, sizeof(none));
1854 if (rrt->rrt_index == ifcp->ifc_index &&
1855 (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) ||
1856 IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) {
1857 trace(1, "\troute found, age it\n");
1858 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1859 rrt->rrt_t = t_lifetime;
1860 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1861 }
1862 updated++;
1863 } else {
1864 trace(1, "\tnon-interface route found: %s/%d on %d\n",
1865 inet6_n2p(&rrt->rrt_info.rip6_dest),
1866 rrt->rrt_info.rip6_plen,
1867 rrt->rrt_index);
1868 }
1869 } else
1870 trace(1, "\tno interface route found\n");
1871 /* age route for p2p destination */
1872 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1873 memset(&ni6, 0, sizeof(ni6));
1874 ni6.rip6_dest = ifa->ifa_raddr;
1875 ni6.rip6_plen = 128;
1876 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/
1877 trace(1, "\tfind p2p route %s/%d on %d\n",
1878 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen,
1879 ifcp->ifc_index);
1880 if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1881 if (rrt->rrt_index == ifcp->ifc_index &&
1882 IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) {
1883 trace(1, "\troute found, age it\n");
1884 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1885 rrt->rrt_t = t_lifetime;
1886 rrt->rrt_info.rip6_metric =
1887 HOPCNT_INFINITY6;
1888 updated++;
1889 }
1890 } else {
1891 trace(1, "\tnon-p2p route found: %s/%d on %d\n",
1892 inet6_n2p(&rrt->rrt_info.rip6_dest),
1893 rrt->rrt_info.rip6_plen,
1894 rrt->rrt_index);
1895 }
1896 } else
1897 trace(1, "\tno p2p route found\n");
1898 }
1899 return updated ? 0 : -1;
1900 }
1901
1902 /*
1903 * Get each interface address and put those interface routes to the route
1904 * list.
1905 */
1906 static int
ifrt(struct ifc * ifcp,int again)1907 ifrt(struct ifc *ifcp, int again)
1908 {
1909 struct ifac *ifa;
1910 struct riprt *rrt, *search_rrt, *prev_rrt, *loop_rrt;
1911 struct netinfo6 *np;
1912 time_t t_lifetime;
1913 int need_trigger = 0;
1914
1915 if (ifcp->ifc_flags & IFF_LOOPBACK)
1916 return 0; /* ignore loopback */
1917 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1918 ifrt_p2p(ifcp, again);
1919 return 0;
1920 }
1921
1922 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
1923 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1924 #if 0
1925 trace(1, "route: %s on %s: "
1926 "skip linklocal interface address\n",
1927 inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name);
1928 #endif
1929 continue;
1930 }
1931 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) {
1932 #if 0
1933 trace(1, "route: %s: skip unspec interface address\n",
1934 ifcp->ifc_name);
1935 #endif
1936 continue;
1937 }
1938 if (ifcp->ifc_flags & IFF_UP) {
1939 if ((rrt = MALLOC(struct riprt)) == NULL)
1940 fatal("malloc: struct riprt");
1941 memset(rrt, 0, sizeof(*rrt));
1942 rrt->rrt_same = NULL;
1943 rrt->rrt_index = ifcp->ifc_index;
1944 rrt->rrt_t = 0; /* don't age */
1945 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
1946 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
1947 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
1948 rrt->rrt_info.rip6_plen = ifa->ifa_plen;
1949 rrt->rrt_flags = RTF_CLONING;
1950 rrt->rrt_rflags |= RRTF_CHANGED;
1951 applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen);
1952 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
1953 #if 0
1954 /* XXX why gateway address == network adddress? */
1955 rrt->rrt_gw = ifa->ifa_addr;
1956 #endif
1957 np = &rrt->rrt_info;
1958 search_rrt = rtsearch(np, &prev_rrt);
1959 if (search_rrt != NULL) {
1960 if (search_rrt->rrt_info.rip6_metric >
1961 rrt->rrt_info.rip6_metric) {
1962 if (prev_rrt)
1963 prev_rrt->rrt_next = rrt->rrt_next;
1964 else
1965 riprt = rrt->rrt_next;
1966 delroute(&rrt->rrt_info, &rrt->rrt_gw);
1967 free(rrt);
1968 } else {
1969 /* Already have better route */
1970 if (!again) {
1971 trace(1, "route: %s/%d: "
1972 "already registered (%s)\n",
1973 inet6_n2p(&np->rip6_dest), np->rip6_plen,
1974 ifcp->ifc_name);
1975 }
1976 free(rrt);
1977 continue;
1978 }
1979 }
1980 /* Attach the route to the list */
1981 trace(1, "route: %s/%d: register route (%s)\n",
1982 inet6_n2p(&np->rip6_dest), np->rip6_plen,
1983 ifcp->ifc_name);
1984 rrt->rrt_next = riprt;
1985 riprt = rrt;
1986 addroute(rrt, &rrt->rrt_gw, ifcp);
1987 sendrequest(ifcp);
1988 ripsend(ifcp, &ifcp->ifc_ripsin, 0);
1989 need_trigger = 1;
1990 } else {
1991 for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) {
1992 if (loop_rrt->rrt_index == ifcp->ifc_index) {
1993 t_lifetime = time(NULL) - RIP_LIFETIME;
1994 if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) {
1995 loop_rrt->rrt_t = t_lifetime;
1996 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1997 loop_rrt->rrt_rflags |= RRTF_CHANGED;
1998 need_trigger = 1;
1999 }
2000 }
2001 }
2002 }
2003 }
2004 return need_trigger;
2005 }
2006
2007 /*
2008 * there are couple of p2p interface routing models. "behavior" lets
2009 * you pick one. it looks that gated behavior fits best with BSDs,
2010 * since BSD kernels does not look at prefix length on p2p interfaces.
2011 */
2012 static void
ifrt_p2p(struct ifc * ifcp,int again)2013 ifrt_p2p(struct ifc *ifcp, int again)
2014 {
2015 struct ifac *ifa;
2016 struct riprt *rrt, *orrt, *prevrrt;
2017 struct netinfo6 *np;
2018 struct in6_addr addr, dest;
2019 int advert, ignore, i;
2020 #define P2PADVERT_NETWORK 1
2021 #define P2PADVERT_ADDR 2
2022 #define P2PADVERT_DEST 4
2023 #define P2PADVERT_MAX 4
2024 const enum { CISCO, GATED, ROUTE6D } behavior = GATED;
2025 const char *category = "";
2026 const char *noadv;
2027
2028 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2029 addr = ifa->ifa_addr;
2030 dest = ifa->ifa_raddr;
2031 applyplen(&addr, ifa->ifa_plen);
2032 applyplen(&dest, ifa->ifa_plen);
2033 advert = ignore = 0;
2034 switch (behavior) {
2035 case CISCO:
2036 /*
2037 * honor addr/plen, just like normal shared medium
2038 * interface. this may cause trouble if you reuse
2039 * addr/plen on other interfaces.
2040 *
2041 * advertise addr/plen.
2042 */
2043 advert |= P2PADVERT_NETWORK;
2044 break;
2045 case GATED:
2046 /*
2047 * prefixlen on p2p interface is meaningless.
2048 * advertise addr/128 and dest/128.
2049 *
2050 * do not install network route to route6d routing
2051 * table (if we do, it would prevent route installation
2052 * for other p2p interface that shares addr/plen).
2053 *
2054 * XXX what should we do if dest is ::? it will not
2055 * get announced anyways (see following filter),
2056 * but we need to think.
2057 */
2058 advert |= P2PADVERT_ADDR;
2059 advert |= P2PADVERT_DEST;
2060 ignore |= P2PADVERT_NETWORK;
2061 break;
2062 case ROUTE6D:
2063 /*
2064 * just for testing. actually the code is redundant
2065 * given the current p2p interface address assignment
2066 * rule for kame kernel.
2067 *
2068 * intent:
2069 * A/n -> announce A/n
2070 * A B/n, A and B share prefix -> A/n (= B/n)
2071 * A B/n, do not share prefix -> A/128 and B/128
2072 * actually, A/64 and A B/128 are the only cases
2073 * permitted by the kernel:
2074 * A/64 -> A/64
2075 * A B/128 -> A/128 and B/128
2076 */
2077 if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) {
2078 if (IN6_ARE_ADDR_EQUAL(&addr, &dest))
2079 advert |= P2PADVERT_NETWORK;
2080 else {
2081 advert |= P2PADVERT_ADDR;
2082 advert |= P2PADVERT_DEST;
2083 ignore |= P2PADVERT_NETWORK;
2084 }
2085 } else
2086 advert |= P2PADVERT_NETWORK;
2087 break;
2088 }
2089
2090 for (i = 1; i <= P2PADVERT_MAX; i *= 2) {
2091 if ((ignore & i) != 0)
2092 continue;
2093 if ((rrt = MALLOC(struct riprt)) == NULL) {
2094 fatal("malloc: struct riprt");
2095 /*NOTREACHED*/
2096 }
2097 memset(rrt, 0, sizeof(*rrt));
2098 rrt->rrt_same = NULL;
2099 rrt->rrt_index = ifcp->ifc_index;
2100 rrt->rrt_t = 0; /* don't age */
2101 switch (i) {
2102 case P2PADVERT_NETWORK:
2103 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2104 rrt->rrt_info.rip6_plen = ifa->ifa_plen;
2105 applyplen(&rrt->rrt_info.rip6_dest,
2106 ifa->ifa_plen);
2107 category = "network";
2108 break;
2109 case P2PADVERT_ADDR:
2110 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2111 rrt->rrt_info.rip6_plen = 128;
2112 rrt->rrt_gw = in6addr_loopback;
2113 category = "addr";
2114 break;
2115 case P2PADVERT_DEST:
2116 rrt->rrt_info.rip6_dest = ifa->ifa_raddr;
2117 rrt->rrt_info.rip6_plen = 128;
2118 rrt->rrt_gw = ifa->ifa_addr;
2119 category = "dest";
2120 break;
2121 }
2122 if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) ||
2123 IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) {
2124 #if 0
2125 trace(1, "route: %s: skip unspec/linklocal "
2126 "(%s on %s)\n", category, ifcp->ifc_name);
2127 #endif
2128 free(rrt);
2129 continue;
2130 }
2131 if ((advert & i) == 0) {
2132 rrt->rrt_rflags |= RRTF_NOADVERTISE;
2133 noadv = ", NO-ADV";
2134 } else
2135 noadv = "";
2136 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2137 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
2138 np = &rrt->rrt_info;
2139 orrt = rtsearch(np, &prevrrt);
2140 if (!orrt) {
2141 /* Attach the route to the list */
2142 trace(1, "route: %s/%d: register route "
2143 "(%s on %s%s)\n",
2144 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2145 category, ifcp->ifc_name, noadv);
2146 rrt->rrt_next = riprt;
2147 riprt = rrt;
2148 } else if (rrt->rrt_index != orrt->rrt_index ||
2149 rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) {
2150 /* swap route */
2151 rrt->rrt_next = orrt->rrt_next;
2152 if (prevrrt)
2153 prevrrt->rrt_next = rrt;
2154 else
2155 riprt = rrt;
2156 free(orrt);
2157
2158 trace(1, "route: %s/%d: update (%s on %s%s)\n",
2159 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2160 category, ifcp->ifc_name, noadv);
2161 } else {
2162 /* Already found */
2163 if (!again) {
2164 trace(1, "route: %s/%d: "
2165 "already registered (%s on %s%s)\n",
2166 inet6_n2p(&np->rip6_dest),
2167 np->rip6_plen, category,
2168 ifcp->ifc_name, noadv);
2169 }
2170 free(rrt);
2171 }
2172 }
2173 }
2174 #undef P2PADVERT_NETWORK
2175 #undef P2PADVERT_ADDR
2176 #undef P2PADVERT_DEST
2177 #undef P2PADVERT_MAX
2178 }
2179
2180 static int
getifmtu(int ifindex)2181 getifmtu(int ifindex)
2182 {
2183 int mib[6];
2184 char *buf;
2185 size_t msize;
2186 struct if_msghdr *ifm;
2187 int mtu;
2188
2189 mib[0] = CTL_NET;
2190 mib[1] = PF_ROUTE;
2191 mib[2] = 0;
2192 mib[3] = AF_INET6;
2193 mib[4] = NET_RT_IFLIST;
2194 mib[5] = ifindex;
2195 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2196 fatal("sysctl estimate NET_RT_IFLIST");
2197 /*NOTREACHED*/
2198 }
2199 if ((buf = malloc(msize)) == NULL) {
2200 fatal("malloc");
2201 /*NOTREACHED*/
2202 }
2203 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2204 fatal("sysctl NET_RT_IFLIST");
2205 /*NOTREACHED*/
2206 }
2207 ifm = (struct if_msghdr *)buf;
2208 mtu = ifm->ifm_data.ifi_mtu;
2209 #ifdef __DragonFly__
2210 if (ifindex != ifm->ifm_index) {
2211 fatal("ifindex does not match with ifm_index");
2212 /*NOTREACHED*/
2213 }
2214 #endif
2215 free(buf);
2216 return mtu;
2217 }
2218
2219 static const char *
rttypes(struct rt_msghdr * rtm)2220 rttypes(struct rt_msghdr *rtm)
2221 {
2222 #define RTTYPE(s, f) \
2223 do { \
2224 if (rtm->rtm_type == (f)) \
2225 return (s); \
2226 } while (0)
2227 RTTYPE("ADD", RTM_ADD);
2228 RTTYPE("DELETE", RTM_DELETE);
2229 RTTYPE("CHANGE", RTM_CHANGE);
2230 RTTYPE("GET", RTM_GET);
2231 RTTYPE("LOSING", RTM_LOSING);
2232 RTTYPE("REDIRECT", RTM_REDIRECT);
2233 RTTYPE("MISS", RTM_MISS);
2234 RTTYPE("LOCK", RTM_LOCK);
2235 RTTYPE("RESOLVE", RTM_RESOLVE);
2236 RTTYPE("NEWADDR", RTM_NEWADDR);
2237 RTTYPE("DELADDR", RTM_DELADDR);
2238 RTTYPE("IFINFO", RTM_IFINFO);
2239 #ifdef RTM_OIFINFO
2240 RTTYPE("OIFINFO", RTM_OIFINFO);
2241 #endif
2242 #ifdef RTM_IFANNOUNCE
2243 RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE);
2244 #endif
2245 #ifdef RTM_NEWMADDR
2246 RTTYPE("NEWMADDR", RTM_NEWMADDR);
2247 #endif
2248 #ifdef RTM_DELMADDR
2249 RTTYPE("DELMADDR", RTM_DELMADDR);
2250 #endif
2251 #undef RTTYPE
2252 return NULL;
2253 }
2254
2255 static const char *
rtflags(struct rt_msghdr * rtm)2256 rtflags(struct rt_msghdr *rtm)
2257 {
2258 static char buf[BUFSIZ];
2259
2260 /*
2261 * letter conflict should be okay. painful when *BSD diverges...
2262 */
2263 strlcpy(buf, "", sizeof(buf));
2264 #define RTFLAG(s, f) \
2265 do { \
2266 if (rtm->rtm_flags & (f)) \
2267 strlcat(buf, (s), sizeof(buf)); \
2268 } while (0)
2269 RTFLAG("U", RTF_UP);
2270 RTFLAG("G", RTF_GATEWAY);
2271 RTFLAG("H", RTF_HOST);
2272 RTFLAG("R", RTF_REJECT);
2273 RTFLAG("D", RTF_DYNAMIC);
2274 RTFLAG("M", RTF_MODIFIED);
2275 RTFLAG("d", RTF_DONE);
2276 #ifdef RTF_MASK
2277 RTFLAG("m", RTF_MASK);
2278 #endif
2279 RTFLAG("C", RTF_CLONING);
2280 #ifdef RTF_CLONED
2281 RTFLAG("c", RTF_CLONED);
2282 #endif
2283 #ifdef RTF_PRCLONING
2284 RTFLAG("c", RTF_PRCLONING);
2285 #endif
2286 #ifdef RTF_WASCLONED
2287 RTFLAG("W", RTF_WASCLONED);
2288 #endif
2289 RTFLAG("X", RTF_XRESOLVE);
2290 RTFLAG("L", RTF_LLINFO);
2291 RTFLAG("S", RTF_STATIC);
2292 RTFLAG("B", RTF_BLACKHOLE);
2293 #ifdef RTF_PROTO3
2294 RTFLAG("3", RTF_PROTO3);
2295 #endif
2296 RTFLAG("2", RTF_PROTO2);
2297 RTFLAG("1", RTF_PROTO1);
2298 #ifdef RTF_BROADCAST
2299 RTFLAG("b", RTF_BROADCAST);
2300 #endif
2301 #ifdef RTF_DEFAULT
2302 RTFLAG("d", RTF_DEFAULT);
2303 #endif
2304 #ifdef RTF_ISAROUTER
2305 RTFLAG("r", RTF_ISAROUTER);
2306 #endif
2307 #ifdef RTF_TUNNEL
2308 RTFLAG("T", RTF_TUNNEL);
2309 #endif
2310 #ifdef RTF_AUTH
2311 RTFLAG("A", RTF_AUTH);
2312 #endif
2313 #ifdef RTF_CRYPT
2314 RTFLAG("E", RTF_CRYPT);
2315 #endif
2316 #undef RTFLAG
2317 return buf;
2318 }
2319
2320 static const char *
ifflags(int flags)2321 ifflags(int flags)
2322 {
2323 static char buf[BUFSIZ];
2324
2325 strlcpy(buf, "", sizeof(buf));
2326 #define IFFLAG(s, f) \
2327 do { \
2328 if (flags & f) { \
2329 if (buf[0]) \
2330 strlcat(buf, ",", sizeof(buf)); \
2331 strlcat(buf, s, sizeof(buf)); \
2332 } \
2333 } while (0)
2334 IFFLAG("UP", IFF_UP);
2335 IFFLAG("BROADCAST", IFF_BROADCAST);
2336 IFFLAG("DEBUG", IFF_DEBUG);
2337 IFFLAG("LOOPBACK", IFF_LOOPBACK);
2338 IFFLAG("POINTOPOINT", IFF_POINTOPOINT);
2339 #ifdef IFF_NOTRAILERS
2340 IFFLAG("NOTRAILERS", IFF_NOTRAILERS);
2341 #endif
2342 #ifdef IFF_SMART
2343 IFFLAG("SMART", IFF_SMART);
2344 #endif
2345 IFFLAG("RUNNING", IFF_RUNNING);
2346 IFFLAG("NOARP", IFF_NOARP);
2347 IFFLAG("PROMISC", IFF_PROMISC);
2348 IFFLAG("ALLMULTI", IFF_ALLMULTI);
2349 IFFLAG("OACTIVE", IFF_OACTIVE);
2350 IFFLAG("SIMPLEX", IFF_SIMPLEX);
2351 IFFLAG("LINK0", IFF_LINK0);
2352 IFFLAG("LINK1", IFF_LINK1);
2353 IFFLAG("LINK2", IFF_LINK2);
2354 IFFLAG("MULTICAST", IFF_MULTICAST);
2355 #undef IFFLAG
2356 return buf;
2357 }
2358
2359 static void
krtread(int again)2360 krtread(int again)
2361 {
2362 int mib[6];
2363 size_t msize;
2364 char *buf, *p, *lim;
2365 struct rt_msghdr *rtm;
2366 int retry;
2367 const char *errmsg;
2368
2369 retry = 0;
2370 buf = NULL;
2371 mib[0] = CTL_NET;
2372 mib[1] = PF_ROUTE;
2373 mib[2] = 0;
2374 mib[3] = AF_INET6; /* Address family */
2375 mib[4] = NET_RT_DUMP; /* Dump the kernel routing table */
2376 mib[5] = 0; /* No flags */
2377 do {
2378 retry++;
2379 errmsg = NULL;
2380 if (buf)
2381 free(buf);
2382 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2383 errmsg = "sysctl estimate";
2384 continue;
2385 }
2386 if ((buf = malloc(msize)) == NULL) {
2387 errmsg = "malloc";
2388 continue;
2389 }
2390 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2391 errmsg = "sysctl NET_RT_DUMP";
2392 continue;
2393 }
2394 } while (retry < 5 && errmsg != NULL);
2395 if (errmsg) {
2396 fatal("%s (with %d retries, msize=%lu)", errmsg, retry,
2397 (u_long)msize);
2398 /*NOTREACHED*/
2399 } else if (1 < retry)
2400 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry);
2401
2402 lim = buf + msize;
2403 for (p = buf; p < lim; p += rtm->rtm_msglen) {
2404 rtm = (struct rt_msghdr *)p;
2405 rt_entry(rtm, again);
2406 }
2407 free(buf);
2408 }
2409
2410 static void
rt_entry(struct rt_msghdr * rtm,int again)2411 rt_entry(struct rt_msghdr *rtm, int again)
2412 {
2413 struct sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask;
2414 struct sockaddr_in6 *sin6_genmask, *sin6_ifp;
2415 char *rtmp, *ifname = NULL;
2416 struct riprt *rrt, *orrt;
2417 struct netinfo6 *np;
2418 int s;
2419
2420 sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = NULL;
2421 if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags &
2422 (RTF_CLONING|RTF_XRESOLVE|RTF_LLINFO|RTF_BLACKHOLE)) {
2423 return; /* not interested in the link route */
2424 }
2425 /* do not look at cloned routes */
2426 #ifdef RTF_WASCLONED
2427 if (rtm->rtm_flags & RTF_WASCLONED)
2428 return;
2429 #endif
2430 #ifdef RTF_CLONED
2431 if (rtm->rtm_flags & RTF_CLONED)
2432 return;
2433 #endif
2434 /*
2435 * do not look at dynamic routes.
2436 * netbsd/openbsd cloned routes have UGHD.
2437 */
2438 if (rtm->rtm_flags & RTF_DYNAMIC)
2439 return;
2440 rtmp = (char *)(rtm + 1);
2441 /* Destination */
2442 if ((rtm->rtm_addrs & RTA_DST) == 0)
2443 return; /* ignore routes without destination address */
2444 sin6_dst = (struct sockaddr_in6 *)rtmp;
2445 rtmp += RT_ROUNDUP(sin6_dst->sin6_len);
2446 if (rtm->rtm_addrs & RTA_GATEWAY) {
2447 sin6_gw = (struct sockaddr_in6 *)rtmp;
2448 rtmp += RT_ROUNDUP(sin6_gw->sin6_len);
2449 }
2450 if (rtm->rtm_addrs & RTA_NETMASK) {
2451 sin6_mask = (struct sockaddr_in6 *)rtmp;
2452 rtmp += RT_ROUNDUP(sin6_mask->sin6_len);
2453 }
2454 if (rtm->rtm_addrs & RTA_GENMASK) {
2455 sin6_genmask = (struct sockaddr_in6 *)rtmp;
2456 rtmp += RT_ROUNDUP(sin6_genmask->sin6_len);
2457 }
2458 if (rtm->rtm_addrs & RTA_IFP) {
2459 sin6_ifp = (struct sockaddr_in6 *)rtmp;
2460 rtmp += RT_ROUNDUP(sin6_ifp->sin6_len);
2461 }
2462
2463 /* Destination */
2464 if (sin6_dst->sin6_family != AF_INET6)
2465 return;
2466 if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr))
2467 return; /* Link-local */
2468 if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback))
2469 return; /* Loopback */
2470 if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr))
2471 return;
2472
2473 if ((rrt = MALLOC(struct riprt)) == NULL) {
2474 fatal("malloc: struct riprt");
2475 /*NOTREACHED*/
2476 }
2477 memset(rrt, 0, sizeof(*rrt));
2478 np = &rrt->rrt_info;
2479 rrt->rrt_same = NULL;
2480 rrt->rrt_t = time(NULL);
2481 if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC))
2482 rrt->rrt_t = 0; /* Don't age static routes */
2483 #if 0
2484 np->rip6_tag = htons(routetag & 0xffff);
2485 #else
2486 np->rip6_tag = 0;
2487 #endif
2488 np->rip6_metric = rtm->rtm_rmx.rmx_hopcount;
2489 if (np->rip6_metric < 1)
2490 np->rip6_metric = 1;
2491 rrt->rrt_flags = rtm->rtm_flags;
2492 np->rip6_dest = sin6_dst->sin6_addr;
2493
2494 /* Mask or plen */
2495 if (rtm->rtm_flags & RTF_HOST)
2496 np->rip6_plen = 128; /* Host route */
2497 else if (sin6_mask)
2498 np->rip6_plen = sin6mask2len(sin6_mask);
2499 else
2500 np->rip6_plen = 0;
2501
2502 orrt = rtsearch(np, NULL);
2503 if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) {
2504 /* Already found */
2505 if (!again) {
2506 trace(1, "route: %s/%d flags %s: already registered\n",
2507 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2508 rtflags(rtm));
2509 }
2510 free(rrt);
2511 return;
2512 }
2513 /* Gateway */
2514 if (!sin6_gw)
2515 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2516 else {
2517 if (sin6_gw->sin6_family == AF_INET6)
2518 rrt->rrt_gw = sin6_gw->sin6_addr;
2519 else if (sin6_gw->sin6_family == AF_LINK) {
2520 /* XXX in case ppp link? */
2521 rrt->rrt_gw = in6addr_loopback;
2522 } else
2523 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2524 }
2525 trace(1, "route: %s/%d flags %s",
2526 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm));
2527 trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw));
2528
2529 /* Interface */
2530 s = rtm->rtm_index;
2531 if (s < nindex2ifc && index2ifc[s])
2532 ifname = index2ifc[s]->ifc_name;
2533 else {
2534 trace(1, " not configured\n");
2535 free(rrt);
2536 return;
2537 }
2538 trace(1, " if %s sock %d", ifname, s);
2539 rrt->rrt_index = s;
2540
2541 trace(1, "\n");
2542
2543 /* Check gateway */
2544 if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) &&
2545 !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)
2546 #ifdef __DragonFly__
2547 && (rrt->rrt_flags & RTF_LOCAL) == 0
2548 #endif
2549 ) {
2550 trace(0, "***** Gateway %s is not a link-local address.\n",
2551 inet6_n2p(&rrt->rrt_gw));
2552 trace(0, "***** dest(%s) if(%s) -- Not optimized.\n",
2553 inet6_n2p(&rrt->rrt_info.rip6_dest), ifname);
2554 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR;
2555 }
2556
2557 /* Put it to the route list */
2558 if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) {
2559 /* replace route list */
2560 rrt->rrt_next = orrt->rrt_next;
2561 *orrt = *rrt;
2562 trace(1, "route: %s/%d flags %s: replace new route\n",
2563 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2564 rtflags(rtm));
2565 free(rrt);
2566 } else {
2567 rrt->rrt_next = riprt;
2568 riprt = rrt;
2569 }
2570 }
2571
2572 static int
addroute(struct riprt * rrt,const struct in6_addr * gw,struct ifc * ifcp)2573 addroute(struct riprt *rrt, const struct in6_addr *gw, struct ifc *ifcp)
2574 {
2575 struct netinfo6 *np;
2576 u_char buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ];
2577 struct rt_msghdr *rtm;
2578 struct sockaddr_in6 *sin;
2579 int len;
2580
2581 np = &rrt->rrt_info;
2582 inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1));
2583 inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2));
2584 tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n",
2585 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2586 np->rip6_metric - 1, buf2);
2587 if (rtlog)
2588 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(),
2589 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2590 np->rip6_metric - 1, buf2);
2591 if (nflag)
2592 return 0;
2593
2594 memset(buf, 0, sizeof(buf));
2595 rtm = (struct rt_msghdr *)buf;
2596 rtm->rtm_type = RTM_ADD;
2597 rtm->rtm_version = RTM_VERSION;
2598 rtm->rtm_seq = ++seq;
2599 rtm->rtm_pid = pid;
2600 rtm->rtm_flags = rrt->rrt_flags;
2601 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2602 rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1;
2603 rtm->rtm_inits = RTV_HOPCOUNT;
2604 sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2605 /* Destination */
2606 sin->sin6_len = sizeof(struct sockaddr_in6);
2607 sin->sin6_family = AF_INET6;
2608 sin->sin6_addr = np->rip6_dest;
2609 sin = (struct sockaddr_in6 *)((char *)sin + RT_ROUNDUP(sin->sin6_len));
2610 /* Gateway */
2611 sin->sin6_len = sizeof(struct sockaddr_in6);
2612 sin->sin6_family = AF_INET6;
2613 sin->sin6_addr = *gw;
2614 sin = (struct sockaddr_in6 *)((char *)sin + RT_ROUNDUP(sin->sin6_len));
2615 /* Netmask */
2616 sin->sin6_len = sizeof(struct sockaddr_in6);
2617 sin->sin6_family = AF_INET6;
2618 sin->sin6_addr = *(plen2mask(np->rip6_plen));
2619 sin = (struct sockaddr_in6 *)((char *)sin + RT_ROUNDUP(sin->sin6_len));
2620
2621 len = (char *)sin - (char *)buf;
2622 rtm->rtm_msglen = len;
2623 if (write(rtsock, buf, len) > 0)
2624 return 0;
2625
2626 if (errno == EEXIST) {
2627 trace(0, "ADD: Route already exists %s/%d gw %s\n",
2628 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2629 if (rtlog)
2630 fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n",
2631 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2632 } else {
2633 trace(0, "Can not write to rtsock (addroute): %s\n",
2634 strerror(errno));
2635 if (rtlog)
2636 fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2637 strerror(errno));
2638 }
2639 return -1;
2640 }
2641
2642 static int
delroute(struct netinfo6 * np,struct in6_addr * gw)2643 delroute(struct netinfo6 *np, struct in6_addr *gw)
2644 {
2645 u_char buf[BUFSIZ], buf2[BUFSIZ];
2646 struct rt_msghdr *rtm;
2647 struct sockaddr_in6 *sin;
2648 int len;
2649
2650 inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2));
2651 tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest),
2652 np->rip6_plen, buf2);
2653 if (rtlog)
2654 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n",
2655 hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2656 if (nflag)
2657 return 0;
2658
2659 memset(buf, 0, sizeof(buf));
2660 rtm = (struct rt_msghdr *)buf;
2661 rtm->rtm_type = RTM_DELETE;
2662 rtm->rtm_version = RTM_VERSION;
2663 rtm->rtm_seq = ++seq;
2664 rtm->rtm_pid = pid;
2665 rtm->rtm_flags = RTF_UP | RTF_GATEWAY;
2666 if (np->rip6_plen == sizeof(struct in6_addr) * 8)
2667 rtm->rtm_flags |= RTF_HOST;
2668 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2669 sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2670 /* Destination */
2671 sin->sin6_len = sizeof(struct sockaddr_in6);
2672 sin->sin6_family = AF_INET6;
2673 sin->sin6_addr = np->rip6_dest;
2674 sin = (struct sockaddr_in6 *)((char *)sin + RT_ROUNDUP(sin->sin6_len));
2675 /* Gateway */
2676 sin->sin6_len = sizeof(struct sockaddr_in6);
2677 sin->sin6_family = AF_INET6;
2678 sin->sin6_addr = *gw;
2679 sin = (struct sockaddr_in6 *)((char *)sin + RT_ROUNDUP(sin->sin6_len));
2680 /* Netmask */
2681 sin->sin6_len = sizeof(struct sockaddr_in6);
2682 sin->sin6_family = AF_INET6;
2683 sin->sin6_addr = *(plen2mask(np->rip6_plen));
2684 sin = (struct sockaddr_in6 *)((char *)sin + RT_ROUNDUP(sin->sin6_len));
2685
2686 len = (char *)sin - (char *)buf;
2687 rtm->rtm_msglen = len;
2688 if (write(rtsock, buf, len) >= 0)
2689 return 0;
2690
2691 if (errno == ESRCH) {
2692 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n",
2693 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2694 if (rtlog)
2695 fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n",
2696 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2697 } else {
2698 trace(0, "Can not write to rtsock (delroute): %s\n",
2699 strerror(errno));
2700 if (rtlog)
2701 fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2702 strerror(errno));
2703 }
2704 return -1;
2705 }
2706
2707 #if 0
2708 static struct in6_addr *
2709 getroute(struct netinfo6 *np, struct in6_addr *gw)
2710 {
2711 u_char buf[BUFSIZ];
2712 u_long myseq;
2713 int len;
2714 struct rt_msghdr *rtm;
2715 struct sockaddr_in6 *sin;
2716
2717 rtm = (struct rt_msghdr *)buf;
2718 len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6);
2719 memset(rtm, 0, len);
2720 rtm->rtm_type = RTM_GET;
2721 rtm->rtm_version = RTM_VERSION;
2722 myseq = ++seq;
2723 rtm->rtm_seq = myseq;
2724 rtm->rtm_addrs = RTA_DST;
2725 rtm->rtm_msglen = len;
2726 sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2727 sin->sin6_len = sizeof(struct sockaddr_in6);
2728 sin->sin6_family = AF_INET6;
2729 sin->sin6_addr = np->rip6_dest;
2730 if (write(rtsock, buf, len) < 0) {
2731 if (errno == ESRCH) /* No such route found */
2732 return NULL;
2733 perror("write to rtsock");
2734 exit(1);
2735 }
2736 do {
2737 if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
2738 perror("read from rtsock");
2739 exit(1);
2740 }
2741 rtm = (struct rt_msghdr *)buf;
2742 } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid);
2743 sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2744 if (rtm->rtm_addrs & RTA_DST) {
2745 sin = (struct sockaddr_in6 *)
2746 ((char *)sin + RT_ROUNDUP(sin->sin6_len));
2747 }
2748 if (rtm->rtm_addrs & RTA_GATEWAY) {
2749 *gw = sin->sin6_addr;
2750 return gw;
2751 }
2752 return NULL;
2753 }
2754 #endif
2755
2756 static const char *
inet6_n2p(const struct in6_addr * p)2757 inet6_n2p(const struct in6_addr *p)
2758 {
2759 static char buf[BUFSIZ];
2760
2761 return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf));
2762 }
2763
2764 static void
ifrtdump(int sig)2765 ifrtdump(int sig)
2766 {
2767 ifdump(sig);
2768 rtdump(sig);
2769 }
2770
2771 static void
ifdump(int sig)2772 ifdump(int sig)
2773 {
2774 struct ifc *ifcp;
2775 FILE *dump;
2776 int i;
2777
2778 if (sig == 0)
2779 dump = stderr;
2780 else
2781 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2782 dump = stderr;
2783
2784 fprintf(dump, "%s: Interface Table Dump\n", hms());
2785 fprintf(dump, " Number of interfaces: %d\n", nifc);
2786 for (i = 0; i < 2; i++) {
2787 fprintf(dump, " %sadvertising interfaces:\n", i ? "non-" : "");
2788 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
2789 if (i == 0) {
2790 if ((ifcp->ifc_flags & IFF_UP) == 0)
2791 continue;
2792 if (iff_find(ifcp, 'N') != NULL)
2793 continue;
2794 } else {
2795 if (ifcp->ifc_flags & IFF_UP)
2796 continue;
2797 }
2798 ifdump0(dump, ifcp);
2799 }
2800 }
2801 fprintf(dump, "\n");
2802 if (dump != stderr)
2803 fclose(dump);
2804 }
2805
2806 static void
ifdump0(FILE * dump,const struct ifc * ifcp)2807 ifdump0(FILE *dump, const struct ifc *ifcp)
2808 {
2809 struct ifac *ifa;
2810 struct iff *iffp;
2811 char buf[BUFSIZ];
2812 const char *ft;
2813 int addr;
2814
2815 fprintf(dump, " %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n",
2816 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags),
2817 inet6_n2p(&ifcp->ifc_mylladdr),
2818 ifcp->ifc_mtu, ifcp->ifc_metric);
2819 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2820 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
2821 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr,
2822 buf, sizeof(buf));
2823 fprintf(dump, "\t%s/%d -- %s\n",
2824 inet6_n2p(&ifa->ifa_addr),
2825 ifa->ifa_plen, buf);
2826 } else {
2827 fprintf(dump, "\t%s/%d\n",
2828 inet6_n2p(&ifa->ifa_addr),
2829 ifa->ifa_plen);
2830 }
2831 }
2832 if (ifcp->ifc_filter) {
2833 fprintf(dump, "\tFilter:");
2834 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
2835 addr = 0;
2836 switch (iffp->iff_type) {
2837 case 'A':
2838 ft = "Aggregate"; addr++; break;
2839 case 'N':
2840 ft = "No-use"; break;
2841 case 'O':
2842 ft = "Advertise-only"; addr++; break;
2843 case 'T':
2844 ft = "Default-only"; break;
2845 case 'L':
2846 ft = "Listen-only"; addr++; break;
2847 default:
2848 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type);
2849 ft = buf;
2850 addr++;
2851 break;
2852 }
2853 fprintf(dump, " %s", ft);
2854 if (addr) {
2855 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr),
2856 iffp->iff_plen);
2857 }
2858 }
2859 fprintf(dump, "\n");
2860 }
2861 }
2862
2863 static void
rtdump(int sig)2864 rtdump(int sig)
2865 {
2866 struct riprt *rrt;
2867 char buf[BUFSIZ];
2868 FILE *dump;
2869 time_t t, age;
2870
2871 if (sig == 0)
2872 dump = stderr;
2873 else
2874 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2875 dump = stderr;
2876
2877 t = time(NULL);
2878 fprintf(dump, "\n%s: Routing Table Dump\n", hms());
2879 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
2880 if (rrt->rrt_t == 0)
2881 age = 0;
2882 else
2883 age = t - rrt->rrt_t;
2884 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest,
2885 buf, sizeof(buf));
2886 fprintf(dump, " %s/%d if(%d:%s) gw(%s) [%d] age(%ld)",
2887 buf, rrt->rrt_info.rip6_plen, rrt->rrt_index,
2888 index2ifc[rrt->rrt_index]->ifc_name,
2889 inet6_n2p(&rrt->rrt_gw),
2890 rrt->rrt_info.rip6_metric, (long)age);
2891 if (rrt->rrt_info.rip6_tag) {
2892 fprintf(dump, " tag(0x%04x)",
2893 ntohs(rrt->rrt_info.rip6_tag) & 0xffff);
2894 }
2895 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)
2896 fprintf(dump, " NOT-LL");
2897 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
2898 fprintf(dump, " NO-ADV");
2899 fprintf(dump, "\n");
2900 }
2901 fprintf(dump, "\n");
2902 if (dump != stderr)
2903 fclose(dump);
2904 }
2905
2906 /*
2907 * Parse the -A (and -O) options and put corresponding filter object to the
2908 * specified interface structures. Each of the -A/O option has the following
2909 * syntax: -A 5f09:c400::/32,ef0,ef1 (aggregate)
2910 * -O 5f09:c400::/32,ef0,ef1 (only when match)
2911 */
2912 static void
filterconfig(void)2913 filterconfig(void)
2914 {
2915 int i;
2916 char *p, *ap, *iflp, *ifname;
2917 struct iff ftmp, *iff_obj;
2918 struct ifc *ifcp;
2919 struct riprt *rrt;
2920 #if 0
2921 struct in6_addr gw;
2922 #endif
2923
2924 for (i = 0; i < nfilter; i++) {
2925 ap = filter[i];
2926 iflp = NULL;
2927 ifcp = NULL;
2928 if (filtertype[i] == 'N' || filtertype[i] == 'T') {
2929 iflp = ap;
2930 goto ifonly;
2931 }
2932 if ((p = strchr(ap, ',')) != NULL) {
2933 *p++ = '\0';
2934 iflp = p;
2935 }
2936 if ((p = strchr(ap, '/')) == NULL) {
2937 fatal("no prefixlen specified for '%s'", ap);
2938 /*NOTREACHED*/
2939 }
2940 *p++ = '\0';
2941 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) {
2942 fatal("invalid prefix specified for '%s'", ap);
2943 /*NOTREACHED*/
2944 }
2945 ftmp.iff_plen = atoi(p);
2946 ftmp.iff_next = NULL;
2947 applyplen(&ftmp.iff_addr, ftmp.iff_plen);
2948 ifonly:
2949 ftmp.iff_type = filtertype[i];
2950 if (iflp == NULL || *iflp == '\0') {
2951 fatal("no interface specified for '%s'", ap);
2952 /*NOTREACHED*/
2953 }
2954 /* parse the interface listing portion */
2955 while (iflp) {
2956 ifname = iflp;
2957 if ((iflp = strchr(iflp, ',')) != NULL)
2958 *iflp++ = '\0';
2959 ifcp = ifc_find(ifname);
2960 if (ifcp == NULL) {
2961 fatal("no interface %s exists", ifname);
2962 /*NOTREACHED*/
2963 }
2964 iff_obj = (struct iff *)malloc(sizeof(struct iff));
2965 if (iff_obj == NULL) {
2966 fatal("malloc of iff_obj");
2967 /*NOTREACHED*/
2968 }
2969 memcpy((void *)iff_obj, (void *)&ftmp,
2970 sizeof(struct iff));
2971 /* link it to the interface filter */
2972 iff_obj->iff_next = ifcp->ifc_filter;
2973 ifcp->ifc_filter = iff_obj;
2974 }
2975
2976 /*
2977 * -A: aggregate configuration.
2978 */
2979 if (filtertype[i] != 'A')
2980 continue;
2981 /* put the aggregate to the kernel routing table */
2982 rrt = (struct riprt *)malloc(sizeof(struct riprt));
2983 if (rrt == NULL) {
2984 fatal("malloc: rrt");
2985 /*NOTREACHED*/
2986 }
2987 memset(rrt, 0, sizeof(struct riprt));
2988 rrt->rrt_info.rip6_dest = ftmp.iff_addr;
2989 rrt->rrt_info.rip6_plen = ftmp.iff_plen;
2990 rrt->rrt_info.rip6_metric = 1;
2991 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2992 rrt->rrt_gw = in6addr_loopback;
2993 rrt->rrt_flags = RTF_UP | RTF_REJECT;
2994 rrt->rrt_rflags = RRTF_AGGREGATE;
2995 rrt->rrt_t = 0;
2996 rrt->rrt_index = loopifindex;
2997 #if 0
2998 if (getroute(&rrt->rrt_info, &gw)) {
2999 #if 0
3000 /*
3001 * When the address has already been registered in the
3002 * kernel routing table, it should be removed
3003 */
3004 delroute(&rrt->rrt_info, &gw);
3005 #else
3006 /* it is safer behavior */
3007 errno = EINVAL;
3008 fatal("%s/%u already in routing table, "
3009 "cannot aggregate",
3010 inet6_n2p(&rrt->rrt_info.rip6_dest),
3011 rrt->rrt_info.rip6_plen);
3012 /*NOTREACHED*/
3013 #endif
3014 }
3015 #endif
3016 /* Put the route to the list */
3017 rrt->rrt_next = riprt;
3018 riprt = rrt;
3019 trace(1, "Aggregate: %s/%d for %s\n",
3020 inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen,
3021 ifcp->ifc_name);
3022 /* Add this route to the kernel */
3023 if (nflag) /* do not modify kernel routing table */
3024 continue;
3025 addroute(rrt, &in6addr_loopback, loopifcp);
3026 }
3027 }
3028
3029 /***************** utility functions *****************/
3030
3031 /*
3032 * Returns a pointer to ifac whose address and prefix length matches
3033 * with the address and prefix length specified in the arguments.
3034 */
3035 static struct ifac *
ifa_match(const struct ifc * ifcp,const struct in6_addr * ia,int plen)3036 ifa_match(const struct ifc *ifcp, const struct in6_addr *ia, int plen)
3037 {
3038 struct ifac *ifa;
3039
3040 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
3041 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) &&
3042 ifa->ifa_plen == plen)
3043 break;
3044 }
3045 return ifa;
3046 }
3047
3048 /*
3049 * Return a pointer to riprt structure whose address and prefix length
3050 * matches with the address and prefix length found in the argument.
3051 * Note: This is not a rtalloc(). Therefore exact match is necessary.
3052 */
3053 static struct riprt *
rtsearch(struct netinfo6 * np,struct riprt ** prev_rrt)3054 rtsearch(struct netinfo6 *np, struct riprt **prev_rrt)
3055 {
3056 struct riprt *rrt;
3057
3058 if (prev_rrt)
3059 *prev_rrt = NULL;
3060 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
3061 if (rrt->rrt_info.rip6_plen == np->rip6_plen &&
3062 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
3063 &np->rip6_dest))
3064 return rrt;
3065 if (prev_rrt)
3066 *prev_rrt = rrt;
3067 }
3068 if (prev_rrt)
3069 *prev_rrt = NULL;
3070 return 0;
3071 }
3072
3073 static int
sin6mask2len(const struct sockaddr_in6 * sin6)3074 sin6mask2len(const struct sockaddr_in6 *sin6)
3075 {
3076 return mask2len(&sin6->sin6_addr,
3077 sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr));
3078 }
3079
3080 static int
mask2len(const struct in6_addr * addr,int lenlim)3081 mask2len(const struct in6_addr *addr, int lenlim)
3082 {
3083 int i = 0, j;
3084 const u_char *p = (const u_char *)addr;
3085
3086 for (j = 0; j < lenlim; j++, p++) {
3087 if (*p != 0xff)
3088 break;
3089 i += 8;
3090 }
3091 if (j < lenlim) {
3092 switch (*p) {
3093 #define MASKLEN(m, l) case m: do { i += l; break; } while (0)
3094 MASKLEN(0xfe, 7); break;
3095 MASKLEN(0xfc, 6); break;
3096 MASKLEN(0xf8, 5); break;
3097 MASKLEN(0xf0, 4); break;
3098 MASKLEN(0xe0, 3); break;
3099 MASKLEN(0xc0, 2); break;
3100 MASKLEN(0x80, 1); break;
3101 #undef MASKLEN
3102 }
3103 }
3104 return i;
3105 }
3106
3107 static const u_char plent[8] = {
3108 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
3109 };
3110
3111 static void
applyplen(struct in6_addr * ia,int plen)3112 applyplen(struct in6_addr *ia, int plen)
3113 {
3114 u_char *p;
3115 int i;
3116
3117 p = ia->s6_addr;
3118 for (i = 0; i < 16; i++) {
3119 if (plen <= 0)
3120 *p = 0;
3121 else if (plen < 8)
3122 *p &= plent[plen];
3123 p++, plen -= 8;
3124 }
3125 }
3126
3127 static const int pl2m[9] = {
3128 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
3129 };
3130
3131 static struct in6_addr *
plen2mask(int n)3132 plen2mask(int n)
3133 {
3134 static struct in6_addr ia;
3135 u_char *p;
3136 int i;
3137
3138 memset(&ia, 0, sizeof(struct in6_addr));
3139 p = (u_char *)&ia;
3140 for (i = 0; i < 16; i++, p++, n -= 8) {
3141 if (n >= 8) {
3142 *p = 0xff;
3143 continue;
3144 }
3145 *p = pl2m[n];
3146 break;
3147 }
3148 return &ia;
3149 }
3150
3151 static char *
allocopy(char * p)3152 allocopy(char *p)
3153 {
3154 char *q = (char *)malloc(strlen(p) + 1);
3155
3156 strcpy(q, p);
3157 return q;
3158 }
3159
3160 static char *
hms(void)3161 hms(void)
3162 {
3163 static char buf[BUFSIZ];
3164 time_t t;
3165 struct tm *tm;
3166
3167 t = time(NULL);
3168 if ((tm = localtime(&t)) == NULL) {
3169 fatal("localtime");
3170 /*NOTREACHED*/
3171 }
3172 snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min,
3173 tm->tm_sec);
3174 return buf;
3175 }
3176
3177 #define RIPRANDDEV 1.0 /* 30 +- 15, max - min = 30 */
3178
3179 static int
ripinterval(int timer)3180 ripinterval(int timer)
3181 {
3182 double r = rand();
3183
3184 interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5));
3185 nextalarm = time(NULL) + interval;
3186 return interval;
3187 }
3188
3189 static void
fatal(const char * fmt,...)3190 fatal(const char *fmt, ...)
3191 {
3192 va_list ap;
3193 char buf[1024];
3194
3195 va_start(ap, fmt);
3196 vsnprintf(buf, sizeof(buf), fmt, ap);
3197 va_end(ap);
3198 perror(buf);
3199 if (errno)
3200 syslog(LOG_ERR, "%s: %s", buf, strerror(errno));
3201 else
3202 syslog(LOG_ERR, "%s", buf);
3203 rtdexit();
3204 }
3205
3206 static void
tracet(int level,const char * fmt,...)3207 tracet(int level, const char *fmt, ...)
3208 {
3209 va_list ap;
3210
3211 va_start(ap, fmt);
3212 if (level <= dflag) {
3213 fprintf(stderr, "%s: ", hms());
3214 vfprintf(stderr, fmt, ap);
3215 }
3216 if (dflag) {
3217 if (level > 0)
3218 vsyslog(LOG_DEBUG, fmt, ap);
3219 else
3220 vsyslog(LOG_WARNING, fmt, ap);
3221 }
3222 va_end(ap);
3223 }
3224
3225 static void
trace(int level,const char * fmt,...)3226 trace(int level, const char *fmt, ...)
3227 {
3228 va_list ap;
3229
3230 va_start(ap, fmt);
3231 if (level <= dflag)
3232 vfprintf(stderr, fmt, ap);
3233 if (dflag) {
3234 if (level > 0)
3235 vsyslog(LOG_DEBUG, fmt, ap);
3236 else
3237 vsyslog(LOG_WARNING, fmt, ap);
3238 }
3239 va_end(ap);
3240 }
3241
3242 static struct ifc *
ifc_find(char * name)3243 ifc_find(char *name)
3244 {
3245 struct ifc *ifcp;
3246
3247 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
3248 if (strcmp(name, ifcp->ifc_name) == 0)
3249 return ifcp;
3250 }
3251 return NULL;
3252 }
3253
3254 static struct iff *
iff_find(struct ifc * ifcp,int type)3255 iff_find(struct ifc *ifcp, int type)
3256 {
3257 struct iff *iffp;
3258
3259 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
3260 if (iffp->iff_type == type)
3261 return iffp;
3262 }
3263 return NULL;
3264 }
3265
3266 static void
setindex2ifc(int idx,struct ifc * ifcp)3267 setindex2ifc(int idx, struct ifc *ifcp)
3268 {
3269 int n;
3270 struct ifc **p;
3271
3272 if (!index2ifc) {
3273 nindex2ifc = 5; /*initial guess*/
3274 index2ifc = (struct ifc **)
3275 malloc(sizeof(*index2ifc) * nindex2ifc);
3276 if (index2ifc == NULL) {
3277 fatal("malloc");
3278 /*NOTREACHED*/
3279 }
3280 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc);
3281 }
3282 n = nindex2ifc;
3283 while (nindex2ifc <= idx)
3284 nindex2ifc *= 2;
3285 if (n != nindex2ifc) {
3286 p = (struct ifc **)realloc(index2ifc,
3287 sizeof(*index2ifc) * nindex2ifc);
3288 if (p == NULL) {
3289 fatal("realloc");
3290 /*NOTREACHED*/
3291 }
3292 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n));
3293 index2ifc = p;
3294 }
3295 index2ifc[idx] = ifcp;
3296 }
3297