1 /* $NetBSD: route6d.c,v 1.74 2019/07/11 03:49:52 msaitoh Exp $ */
2 /* $KAME: route6d.c,v 1.94 2002/10/26 20:08:55 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 #ifndef lint
35 __RCSID("$NetBSD: route6d.c,v 1.74 2019/07/11 03:49:52 msaitoh Exp $");
36 #endif
37
38 #include <stdbool.h>
39 #include <stdio.h>
40
41 #include <time.h>
42 #include <unistd.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <signal.h>
46 #include <stdarg.h>
47 #include <syslog.h>
48 #include <stddef.h>
49 #include <errno.h>
50 #include <err.h>
51 #include <util.h>
52 #include <poll.h>
53
54 #include <sys/types.h>
55 #include <sys/param.h>
56 #include <sys/file.h>
57 #include <sys/socket.h>
58 #include <sys/ioctl.h>
59 #include <sys/sysctl.h>
60 #include <sys/uio.h>
61 #include <net/if.h>
62 #include <net/route.h>
63 #include <netinet/in.h>
64 #include <netinet/in_var.h>
65 #include <netinet/ip6.h>
66 #include <netinet/udp.h>
67 #include <netdb.h>
68 #include <ifaddrs.h>
69
70 #include <arpa/inet.h>
71
72 #include "route6d.h"
73
74 #define MAXFILTER 40
75
76 #ifdef DEBUG
77 #define INIT_INTERVAL6 6
78 #else
79 #define INIT_INTERVAL6 10 /* Wait to submit a initial riprequest */
80 #endif
81
82 /* alignment constraint for routing socket */
83 #if defined(RT_ROUNDUP)
84 #define ROUNDUP(a) RT_ROUNDUP(a)
85 #else
86 #define ROUNDUP(a) \
87 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
88 #endif
89
90 /*
91 * Following two macros are highly depending on KAME Release
92 */
93 #define IN6_LINKLOCAL_IFINDEX(addr) \
94 ((addr).s6_addr[2] << 8 | (addr).s6_addr[3])
95
96 #define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \
97 do { \
98 (addr).s6_addr[2] = ((index) >> 8) & 0xff; \
99 (addr).s6_addr[3] = (index) & 0xff; \
100 } while (0)
101
102 struct ifc { /* Configuration of an interface */
103 char *ifc_name; /* if name */
104 struct ifc *ifc_next;
105 int ifc_index; /* if index */
106 int ifc_mtu; /* if mtu */
107 int ifc_metric; /* if metric */
108 u_int ifc_flags; /* flags */
109 short ifc_cflags; /* IFC_XXX */
110 struct in6_addr ifc_mylladdr; /* my link-local address */
111 struct sockaddr_in6 ifc_ripsin; /* rip multicast address */
112 struct iff *ifc_filter; /* filter structure */
113 struct ifac *ifc_addr; /* list of AF_INET6 addresses */
114 int ifc_joined; /* joined to ff02::9 */
115 };
116
117 struct ifac { /* Address associated to an interface */
118 struct ifc *ifa_conf; /* back pointer */
119 struct ifac *ifa_next;
120 struct in6_addr ifa_addr; /* address */
121 struct in6_addr ifa_raddr; /* remote address, valid in p2p */
122 int ifa_plen; /* prefix length */
123 };
124
125 struct iff {
126 int iff_type;
127 struct in6_addr iff_addr;
128 int iff_plen;
129 struct iff *iff_next;
130 };
131
132 static struct ifc *ifc;
133 static int nifc; /* number of valid ifc's */
134 static struct ifc **index2ifc;
135 static int nindex2ifc;
136 static struct ifc *loopifcp = NULL; /* pointing to loopback */
137 static struct pollfd set[2];
138 static int rtsock; /* the routing socket */
139 static int ripsock; /* socket to send/receive RIP datagram */
140
141 static struct rip6 *ripbuf; /* packet buffer for sending */
142
143 /*
144 * Maintain the routes in a linked list. When the number of the routes
145 * grows, somebody would like to introduce a hash based or a radix tree
146 * based structure. I believe the number of routes handled by RIP is
147 * limited and I don't have to manage a complex data structure, however.
148 *
149 * One of the major drawbacks of the linear linked list is the difficulty
150 * of representing the relationship between a couple of routes. This may
151 * be a significant problem when we have to support route aggregation with
152 * suppressing the specifices covered by the aggregate.
153 */
154
155 struct riprt {
156 struct riprt *rrt_next; /* next destination */
157 struct riprt *rrt_same; /* same destination - future use */
158 struct netinfo6 rrt_info; /* network info */
159 struct in6_addr rrt_gw; /* gateway */
160 u_long rrt_flags; /* kernel routing table flags */
161 u_long rrt_rflags; /* route6d routing table flags */
162 time_t rrt_t; /* when the route validated */
163 int rrt_index; /* ifindex from which this route got */
164 };
165
166 static struct riprt *riprt = 0;
167
168 static int dflag = 0; /* debug flag */
169 static int qflag = 0; /* quiet flag */
170 static int nflag = 0; /* don't update kernel routing table */
171 static int aflag = 0; /* age out even the statically defined routes */
172 static int hflag = 0; /* don't split horizon */
173 static int lflag = 0; /* exchange site local routes */
174 static int sflag = 0; /* announce static routes w/ split horizon */
175 static int Sflag = 0; /* announce static routes to every interface */
176 static unsigned long routetag = 0; /* route tag attached on originating case */
177
178 static char *filter[MAXFILTER];
179 static int filtertype[MAXFILTER];
180 static int nfilter = 0;
181
182 static pid_t pid;
183
184 static struct sockaddr_storage ripsin;
185
186 static int interval = 1;
187 static time_t nextalarm = 0;
188
189 static FILE *rtlog = NULL;
190
191 static int logopened = 0;
192
193 static int seq = 0;
194
195 static volatile sig_atomic_t seenalrm;
196 static volatile sig_atomic_t seenquit;
197 static volatile sig_atomic_t seenusr1;
198
199 #define RRTF_AGGREGATE 0x08000000
200 #define RRTF_NOADVERTISE 0x10000000
201 #define RRTF_NH_NOT_LLADDR 0x20000000
202 #define RRTF_SENDANYWAY 0x40000000
203 #define RRTF_CHANGED 0x80000000
204
205 static void sighandler(int);
206 static void ripalarm(void);
207 static void riprecv(void);
208 static void ripsend(struct ifc *, struct sockaddr_in6 *, int);
209 static int out_filter(struct riprt *, struct ifc *);
210 static void init(void);
211 static void ifconfig(void);
212 static void ifconfig1(const char *, const struct sockaddr *, struct ifc *, int);
213 static void rtrecv(void);
214 static int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *,
215 const struct sockaddr_in6 *);
216 static int rt_deladdr(struct ifc *, const struct sockaddr_in6 *,
217 const struct sockaddr_in6 *);
218 static void filterconfig(void);
219 static int getifmtu(int);
220 static const char *
221 rttypes(struct rt_msghdr *);
222 static const char *
223 rtflags(struct rt_msghdr *);
224 static const char *
225 ifflags(int);
226 static int ifrt(struct ifc *, int);
227 static void ifrt_p2p(struct ifc *, int);
228 static void applyplen(struct in6_addr *, int);
229 static void ifrtdump(int);
230 static void ifdump(int);
231 static void ifdump0(FILE *, const struct ifc *);
232 static void rtdump(int);
233 static void rt_entry(struct rt_msghdr *, int);
234 static void rtdexit(void) __dead;
235 static void riprequest(struct ifc *, struct netinfo6 *, int,
236 struct sockaddr_in6 *);
237 static void ripflush(struct ifc *, struct sockaddr_in6 *);
238 static void sendrequest(struct ifc *);
239 static int sin6mask2len(const struct sockaddr_in6 *);
240 static int mask2len(const struct in6_addr *, int);
241 static int sendpacket(struct sockaddr_in6 *, int);
242 static int addroute(struct riprt *, const struct in6_addr *, struct ifc *);
243 static int delroute(struct netinfo6 *, struct in6_addr *);
244 static void krtread(int);
245 static int tobeadv(struct riprt *, struct ifc *);
246 static char * xstrdup(char *);
247 static char * hms(void);
248 static const char *
249 inet6_n2p(const struct in6_addr *);
250 static struct ifac *
251 ifa_match(const struct ifc *, const struct in6_addr *, int);
252 static struct in6_addr *
253 plen2mask(int);
254 static struct riprt *
255 rtsearch(struct netinfo6 *, struct riprt **);
256 static int ripinterval(int);
257 static void fatal(const char *, ...) __printflike(1, 2) __dead;
258 static void trace(int, const char *, ...) __printflike(2, 3);
259 static void tracet(int, const char *, ...) __printflike(2, 3);
260 static struct ifc *
261 ifc_find(char *);
262 static struct iff *
263 iff_find(struct ifc *, int);
264 static void setindex2ifc(int, struct ifc *);
265
266 #define MALLOC(type) (malloc(sizeof(type)))
267
268 int
main(int argc,char ** argv)269 main(int argc, char **argv)
270 {
271 int ch;
272 int error = 0;
273 struct ifc *ifcp;
274 sigset_t mask, omask;
275 char *progname;
276 char *ep;
277
278 progname = strrchr(*argv, '/');
279 if (progname)
280 progname++;
281 else
282 progname = *argv;
283
284 pid = getpid();
285 while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) {
286 switch (ch) {
287 case 'A':
288 case 'N':
289 case 'O':
290 case 'T':
291 case 'L':
292 if (nfilter >= MAXFILTER) {
293 fatal("Exceeds MAXFILTER");
294 }
295 filtertype[nfilter] = ch;
296 filter[nfilter++] = xstrdup(optarg);
297 break;
298 case 't':
299 ep = NULL;
300 routetag = strtoul(optarg, &ep, 0);
301 if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) {
302 fatal("invalid route tag");
303 }
304 break;
305 case 'R':
306 if ((rtlog = fopen(optarg, "w")) == NULL) {
307 fatal("Can not write to routelog");
308 }
309 break;
310 #define FLAG(c, flag, n) case c: do { flag = n; break; } while(0)
311 FLAG('a', aflag, 1); break;
312 FLAG('d', dflag, 1); break;
313 FLAG('D', dflag, 2); break;
314 FLAG('h', hflag, 1); break;
315 FLAG('l', lflag, 1); break;
316 FLAG('n', nflag, 1); break;
317 FLAG('q', qflag, 1); break;
318 FLAG('s', sflag, 1); break;
319 FLAG('S', Sflag, 1); break;
320 #undef FLAG
321 default:
322 fatal("Invalid option specified, terminating");
323 }
324 }
325 argc -= optind;
326 argv += optind;
327 if (argc > 0) {
328 fatal("bogus extra arguments");
329 }
330
331 if (geteuid()) {
332 nflag = 1;
333 fprintf(stderr, "No kernel update is allowed\n");
334 }
335
336 if (dflag == 0) {
337 if (daemon(0, 0) < 0) {
338 fatal("daemon");
339 }
340 }
341
342 openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
343 logopened++;
344
345 if ((ripbuf = malloc(RIP6_MAXMTU)) == NULL)
346 fatal("malloc");
347 memset(ripbuf, 0, RIP6_MAXMTU);
348 ripbuf->rip6_cmd = RIP6_RESPONSE;
349 ripbuf->rip6_vers = RIP6_VERSION;
350 ripbuf->rip6_res1[0] = 0;
351 ripbuf->rip6_res1[1] = 0;
352
353 init();
354 ifconfig();
355 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
356 if (ifcp->ifc_index < 0) {
357 fprintf(stderr,
358 "No ifindex found at %s (no link-local address?)\n",
359 ifcp->ifc_name);
360 error++;
361 }
362 }
363 if (error)
364 exit(1);
365 if (loopifcp == NULL) {
366 fatal("No loopback found");
367 }
368 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
369 ifrt(ifcp, 0);
370 filterconfig();
371 krtread(0);
372 if (dflag)
373 ifrtdump(0);
374
375 pidfile(NULL);
376
377 if ((ripbuf = malloc(RIP6_MAXMTU)) == NULL) {
378 fatal("malloc");
379 }
380 memset(ripbuf, 0, RIP6_MAXMTU);
381 ripbuf->rip6_cmd = RIP6_RESPONSE;
382 ripbuf->rip6_vers = RIP6_VERSION;
383 ripbuf->rip6_res1[0] = 0;
384 ripbuf->rip6_res1[1] = 0;
385
386 if (signal(SIGALRM, sighandler) == SIG_ERR ||
387 signal(SIGQUIT, sighandler) == SIG_ERR ||
388 signal(SIGTERM, sighandler) == SIG_ERR ||
389 signal(SIGUSR1, sighandler) == SIG_ERR ||
390 signal(SIGHUP, sighandler) == SIG_ERR ||
391 signal(SIGINT, sighandler) == SIG_ERR) {
392 fatal("signal");
393 }
394 /*
395 * To avoid rip packet congestion (not on a cable but in this
396 * process), wait for a moment to send the first RIP6_RESPONSE
397 * packets.
398 */
399 alarm(ripinterval(INIT_INTERVAL6));
400
401 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
402 if (iff_find(ifcp, 'N'))
403 continue;
404 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
405 sendrequest(ifcp);
406 }
407
408 syslog(LOG_INFO, "**** Started ****");
409 sigemptyset(&mask);
410 sigaddset(&mask, SIGALRM);
411 while (1) {
412 if (seenalrm) {
413 ripalarm();
414 seenalrm = 0;
415 continue;
416 }
417 if (seenquit) {
418 rtdexit();
419 seenquit = 0;
420 continue;
421 }
422 if (seenusr1) {
423 ifrtdump(SIGUSR1);
424 seenusr1 = 0;
425 continue;
426 }
427
428 switch (poll(set, 2, INFTIM))
429 {
430 case -1:
431 if (errno != EINTR) {
432 fatal("poll");
433 }
434 continue;
435 case 0:
436 continue;
437 default:
438 if (set[0].revents & POLLIN)
439 {
440 sigprocmask(SIG_BLOCK, &mask, &omask);
441 riprecv();
442 sigprocmask(SIG_SETMASK, &omask, NULL);
443 }
444 if (set[1].revents & POLLIN)
445 {
446 sigprocmask(SIG_BLOCK, &mask, &omask);
447 rtrecv();
448 sigprocmask(SIG_SETMASK, &omask, NULL);
449 }
450 }
451 }
452 }
453
454 static void
sighandler(int signo)455 sighandler(int signo)
456 {
457
458 switch (signo) {
459 case SIGALRM:
460 seenalrm++;
461 break;
462 case SIGQUIT:
463 case SIGTERM:
464 seenquit++;
465 break;
466 case SIGUSR1:
467 case SIGHUP:
468 case SIGINT:
469 seenusr1++;
470 break;
471 }
472 }
473
474 /*
475 * gracefully exits after resetting sockopts.
476 */
477 /* ARGSUSED */
478 static void
rtdexit(void)479 rtdexit(void)
480 {
481 struct riprt *rrt;
482
483 alarm(0);
484 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
485 if (rrt->rrt_rflags & RRTF_AGGREGATE) {
486 delroute(&rrt->rrt_info, &rrt->rrt_gw);
487 }
488 }
489 close(ripsock);
490 close(rtsock);
491 syslog(LOG_INFO, "**** Terminated ****");
492 closelog();
493 exit(1);
494 }
495
496 /*
497 * Called periodically:
498 * 1. age out the learned route. remove it if necessary.
499 * 2. submit RIP6_RESPONSE packets.
500 * Invoked in every SUPPLY_INTERVAL6 (30) seconds. I believe we don't have
501 * to invoke this function in every 1 or 5 or 10 seconds only to age the
502 * routes more precisely.
503 */
504 /* ARGSUSED */
505 static void
ripalarm(void)506 ripalarm(void)
507 {
508 struct ifc *ifcp;
509 struct riprt *rrt, *rrt_prev, *rrt_next;
510 time_t t_lifetime, t_holddown;
511
512 /* age the RIP routes */
513 rrt_prev = 0;
514 t_lifetime = time(NULL) - RIP_LIFETIME;
515 t_holddown = t_lifetime - RIP_HOLDDOWN;
516 for (rrt = riprt; rrt; rrt = rrt_next) {
517 rrt_next = rrt->rrt_next;
518
519 if (rrt->rrt_t == 0) {
520 rrt_prev = rrt;
521 continue;
522 }
523 if (rrt->rrt_t < t_holddown) {
524 if (rrt_prev) {
525 rrt_prev->rrt_next = rrt->rrt_next;
526 } else {
527 riprt = rrt->rrt_next;
528 }
529 delroute(&rrt->rrt_info, &rrt->rrt_gw);
530 free(rrt);
531 continue;
532 }
533 if (rrt->rrt_t < t_lifetime)
534 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
535 rrt_prev = rrt;
536 }
537 /* Supply updates */
538 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
539 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
540 ripsend(ifcp, &ifcp->ifc_ripsin, 0);
541 }
542 alarm(ripinterval(SUPPLY_INTERVAL6));
543 }
544
545 static void
init(void)546 init(void)
547 {
548 int i, error;
549 const int int0 = 0, int1 = 1, int255 = 255;
550 struct addrinfo hints, *res;
551 char port[NI_MAXSERV];
552
553 ifc = NULL;
554 nifc = 0;
555 nindex2ifc = 0; /*initial guess*/
556 index2ifc = NULL;
557 snprintf(port, sizeof(port), "%u", RIP6_PORT);
558
559 memset(&hints, 0, sizeof(hints));
560 hints.ai_family = PF_INET6;
561 hints.ai_socktype = SOCK_DGRAM;
562 hints.ai_flags = AI_PASSIVE;
563 error = getaddrinfo(NULL, port, &hints, &res);
564 if (error) {
565 fatal("%s", gai_strerror(error));
566 }
567 if (res->ai_next) {
568 fatal(":: resolved to multiple address");
569 }
570
571 ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
572 if (ripsock < 0) {
573 fatal("rip socket");
574 }
575 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_V6ONLY,
576 &int1, sizeof(int1)) < 0) {
577 fatal("rip IPV6_V6ONLY");
578 }
579 if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) {
580 fatal("rip bind");
581 }
582 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
583 &int255, sizeof(int255)) < 0) {
584 fatal("rip IPV6_MULTICAST_HOPS");
585 }
586 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
587 &int0, sizeof(int0)) < 0) {
588 fatal("rip IPV6_MULTICAST_LOOP");
589 }
590
591 i = 1;
592 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i,
593 sizeof(i)) < 0) {
594 fatal("rip IPV6_RECVPKTINFO");
595 }
596
597 freeaddrinfo(res);
598 memset(&hints, 0, sizeof(hints));
599 hints.ai_family = PF_INET6;
600 hints.ai_socktype = SOCK_DGRAM;
601 error = getaddrinfo(RIP6_DEST, port, &hints, &res);
602 if (error) {
603 fatal("%s", gai_strerror(error));
604 }
605 if (res->ai_next) {
606 fatal("%s resolved to multiple address", RIP6_DEST);
607 }
608 memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
609 freeaddrinfo(res);
610
611 set[0].fd = ripsock;
612 set[0].events = POLLIN;
613
614 if (nflag == 0) {
615 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
616 fatal("route socket");
617 }
618 set[1].fd = rtsock;
619 set[1].events = POLLIN;
620 } else {
621 set[1].fd = -1;
622 }
623 }
624
625 #define RIPSIZE(n) \
626 (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6))
627
628 /*
629 * ripflush flushes the rip datagram stored in the rip buffer
630 */
631 static int nrt;
632 static struct netinfo6 *nip;
633
634 static void
ripflush(struct ifc * ifcp,struct sockaddr_in6 * sin6)635 ripflush(struct ifc *ifcp, struct sockaddr_in6 *sin6)
636 {
637 int i;
638 int error;
639
640 if (ifcp)
641 tracet(1, "Send(%s): info(%d) to %s.%d\n",
642 ifcp->ifc_name, nrt,
643 inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port));
644 else
645 tracet(1, "Send: info(%d) to %s.%d\n",
646 nrt, inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port));
647 if (dflag >= 2) {
648 nip = ripbuf->rip6_nets;
649 for (i = 0; i < nrt; i++, nip++) {
650 if (nip->rip6_metric == NEXTHOP_METRIC) {
651 if (IN6_IS_ADDR_UNSPECIFIED(&nip->rip6_dest))
652 trace(2, " NextHop reset");
653 else {
654 trace(2, " NextHop %s",
655 inet6_n2p(&nip->rip6_dest));
656 }
657 } else {
658 trace(2, " %s/%d[%d]",
659 inet6_n2p(&nip->rip6_dest),
660 nip->rip6_plen, nip->rip6_metric);
661 }
662 if (nip->rip6_tag) {
663 trace(2, " tag=0x%04x",
664 ntohs(nip->rip6_tag) & 0xffff);
665 }
666 trace(2, "\n");
667 }
668 }
669 error = sendpacket(sin6, RIPSIZE(nrt));
670 if (error == EAFNOSUPPORT && ifcp) {
671 /* Protocol not supported */
672 tracet(1, "Could not send info to %s (%s): "
673 "set IFF_UP to 0\n",
674 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
675 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */
676 }
677 nrt = 0; nip = ripbuf->rip6_nets;
678 }
679
680 /*
681 * Generate RIP6_RESPONSE packets and send them.
682 */
683 static void
ripsend(struct ifc * ifcp,struct sockaddr_in6 * sin6,int flag)684 ripsend(struct ifc *ifcp, struct sockaddr_in6 *sin6, int flag)
685 {
686 struct riprt *rrt;
687 struct in6_addr *nh; /* next hop */
688 int maxrte;
689
690 if (qflag)
691 return;
692
693 if (ifcp == NULL) {
694 /*
695 * Request from non-link local address is not
696 * a regular route6d update.
697 */
698 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) -
699 sizeof(struct udphdr) -
700 sizeof(struct rip6) + sizeof(struct netinfo6)) /
701 sizeof(struct netinfo6);
702 nrt = 0; nip = ripbuf->rip6_nets; nh = NULL;
703 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
704 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
705 continue;
706 /* Put the route to the buffer */
707 *nip = rrt->rrt_info;
708 nip++; nrt++;
709 if (nrt == maxrte) {
710 ripflush(NULL, sin6);
711 nh = NULL;
712 }
713 }
714 if (nrt) /* Send last packet */
715 ripflush(NULL, sin6);
716 return;
717 }
718
719 if ((flag & RRTF_SENDANYWAY) == 0 &&
720 (qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
721 return;
722
723 /* -N: no use */
724 if (iff_find(ifcp, 'N') != NULL)
725 return;
726
727 /* -T: generate default route only */
728 if (iff_find(ifcp, 'T') != NULL) {
729 struct netinfo6 rrt_info;
730 memset(&rrt_info, 0, sizeof(struct netinfo6));
731 rrt_info.rip6_dest = in6addr_any;
732 rrt_info.rip6_plen = 0;
733 rrt_info.rip6_metric = 1;
734 rrt_info.rip6_metric += ifcp->ifc_metric;
735 rrt_info.rip6_tag = htons(routetag & 0xffff);
736 nip = ripbuf->rip6_nets;
737 *nip = rrt_info;
738 nrt = 1;
739 ripflush(ifcp, sin6);
740 return;
741 }
742
743 maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) -
744 sizeof(struct udphdr) -
745 sizeof(struct rip6) + sizeof(struct netinfo6)) /
746 sizeof(struct netinfo6);
747
748 nrt = 0; nip = ripbuf->rip6_nets; nh = NULL;
749 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
750 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
751 continue;
752
753 /* Need to check filter here */
754 if (out_filter(rrt, ifcp) == 0)
755 continue;
756
757 /* Check split horizon and other conditions */
758 if (tobeadv(rrt, ifcp) == 0)
759 continue;
760
761 /* Only considers the routes with flag if specified */
762 if ((flag & RRTF_CHANGED) &&
763 (rrt->rrt_rflags & RRTF_CHANGED) == 0)
764 continue;
765
766 /* Check nexthop */
767 if (rrt->rrt_index == ifcp->ifc_index &&
768 !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) &&
769 (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) {
770 if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) {
771 if (nrt == maxrte - 2)
772 ripflush(ifcp, sin6);
773 nip->rip6_dest = rrt->rrt_gw;
774 if (IN6_IS_ADDR_LINKLOCAL(&nip->rip6_dest))
775 SET_IN6_LINKLOCAL_IFINDEX(nip->rip6_dest, 0);
776 nip->rip6_plen = 0;
777 nip->rip6_tag = 0;
778 nip->rip6_metric = NEXTHOP_METRIC;
779 nh = &rrt->rrt_gw;
780 nip++; nrt++;
781 }
782 } else if (nh && (rrt->rrt_index != ifcp->ifc_index ||
783 !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) ||
784 rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) {
785 /* Reset nexthop */
786 if (nrt == maxrte - 2)
787 ripflush(ifcp, sin6);
788 memset(nip, 0, sizeof(struct netinfo6));
789 nip->rip6_metric = NEXTHOP_METRIC;
790 nh = NULL;
791 nip++; nrt++;
792 }
793
794 /* Put the route to the buffer */
795 *nip = rrt->rrt_info;
796 nip++; nrt++;
797 if (nrt == maxrte) {
798 ripflush(ifcp, sin6);
799 nh = NULL;
800 }
801 }
802 if (nrt) /* Send last packet */
803 ripflush(ifcp, sin6);
804 }
805
806 /*
807 * outbound filter logic, per-route/interface.
808 */
809 static int
out_filter(struct riprt * rrt,struct ifc * ifcp)810 out_filter(struct riprt *rrt, struct ifc *ifcp)
811 {
812 struct iff *iffp;
813 struct in6_addr ia;
814 int ok;
815
816 /*
817 * -A: filter out less specific routes, if we have aggregated
818 * route configured.
819 */
820 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
821 if (iffp->iff_type != 'A')
822 continue;
823 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen)
824 continue;
825 ia = rrt->rrt_info.rip6_dest;
826 applyplen(&ia, iffp->iff_plen);
827 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr))
828 return 0;
829 }
830
831 /*
832 * if it is an aggregated route, advertise it only to the
833 * interfaces specified on -A.
834 */
835 if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) {
836 ok = 0;
837 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
838 if (iffp->iff_type != 'A')
839 continue;
840 if (rrt->rrt_info.rip6_plen == iffp->iff_plen &&
841 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
842 &iffp->iff_addr)) {
843 ok = 1;
844 break;
845 }
846 }
847 if (!ok)
848 return 0;
849 }
850
851 /*
852 * -O: advertise only if prefix matches the configured prefix.
853 */
854 if (iff_find(ifcp, 'O')) {
855 ok = 0;
856 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
857 if (iffp->iff_type != 'O')
858 continue;
859 if (rrt->rrt_info.rip6_plen < iffp->iff_plen)
860 continue;
861 ia = rrt->rrt_info.rip6_dest;
862 applyplen(&ia, iffp->iff_plen);
863 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
864 ok = 1;
865 break;
866 }
867 }
868 if (!ok)
869 return 0;
870 }
871
872 /* the prefix should be advertised */
873 return 1;
874 }
875
876 /*
877 * Determine if the route is to be advertised on the specified interface.
878 * It checks options specified in the arguments and the split horizon rule.
879 */
880 static int
tobeadv(struct riprt * rrt,struct ifc * ifcp)881 tobeadv(struct riprt *rrt, struct ifc *ifcp)
882 {
883
884 /* Special care for static routes */
885 if (rrt->rrt_flags & RTF_STATIC) {
886 /* XXX don't advertise reject/blackhole routes */
887 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE))
888 return 0;
889
890 if (Sflag) /* Yes, advertise it anyway */
891 return 1;
892 if (sflag && rrt->rrt_index != ifcp->ifc_index)
893 return 1;
894 return 0;
895 }
896 /* Regular split horizon */
897 if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index)
898 return 0;
899 return 1;
900 }
901
902 /*
903 * Send a rip packet actually.
904 */
905 static int
sendpacket(struct sockaddr_in6 * sin6,int len)906 sendpacket(struct sockaddr_in6 *sin6, int len)
907 {
908 struct msghdr m;
909 struct cmsghdr *cm;
910 struct iovec iov[2];
911 u_char cmsgbuf[256];
912 struct in6_pktinfo *pi;
913 int idx;
914 struct sockaddr_in6 sincopy;
915
916 /* do not overwrite the given sin */
917 sincopy = *sin6;
918 sin6 = &sincopy;
919
920 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
921 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
922 /* XXX: do not mix the interface index and link index */
923 idx = IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr);
924 SET_IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr, 0);
925 sin6->sin6_scope_id = idx;
926 } else
927 idx = 0;
928
929 m.msg_name = (caddr_t)sin6;
930 m.msg_namelen = sizeof(*sin6);
931 iov[0].iov_base = (caddr_t)ripbuf;
932 iov[0].iov_len = len;
933 m.msg_iov = iov;
934 m.msg_iovlen = 1;
935 if (!idx) {
936 m.msg_control = NULL;
937 m.msg_controllen = 0;
938 } else {
939 memset(cmsgbuf, 0, sizeof(cmsgbuf));
940 cm = (struct cmsghdr *)cmsgbuf;
941 m.msg_control = (caddr_t)cm;
942 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
943
944 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
945 cm->cmsg_level = IPPROTO_IPV6;
946 cm->cmsg_type = IPV6_PKTINFO;
947 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
948 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/
949 pi->ipi6_ifindex = idx;
950 }
951
952 if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) {
953 trace(1, "sendmsg: %s\n", strerror(errno));
954 return errno;
955 }
956
957 return 0;
958 }
959
960 /*
961 * Receive and process RIP packets. Update the routes/kernel forwarding
962 * table if necessary.
963 */
964 static void
riprecv(void)965 riprecv(void)
966 {
967 struct ifc *ifcp, *ic;
968 struct sockaddr_in6 fsock;
969 struct in6_addr nh; /* next hop */
970 struct rip6 *rp;
971 struct netinfo6 *np, *nq;
972 struct riprt *rrt;
973 ssize_t len, nn;
974 unsigned int need_trigger, idx;
975 char buf[4 * RIP6_MAXMTU];
976 time_t t;
977 struct msghdr m;
978 struct cmsghdr *cm;
979 struct iovec iov[2];
980 u_char cmsgbuf[256];
981 struct in6_pktinfo *pi;
982 struct iff *iffp;
983 struct in6_addr ia;
984 int ok;
985 time_t t_half_lifetime;
986
987 need_trigger = 0;
988
989 m.msg_name = (caddr_t)&fsock;
990 m.msg_namelen = sizeof(fsock);
991 iov[0].iov_base = (caddr_t)buf;
992 iov[0].iov_len = sizeof(buf);
993 m.msg_iov = iov;
994 m.msg_iovlen = 1;
995 cm = (struct cmsghdr *)cmsgbuf;
996 m.msg_control = (caddr_t)cm;
997 m.msg_controllen = sizeof(cmsgbuf);
998 if ((len = recvmsg(ripsock, &m, 0)) < 0) {
999 fatal("recvmsg");
1000 }
1001 idx = 0;
1002 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
1003 cm;
1004 cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
1005 if (cm->cmsg_level == IPPROTO_IPV6 &&
1006 cm->cmsg_type == IPV6_PKTINFO) {
1007 pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
1008 idx = pi->ipi6_ifindex;
1009 break;
1010 }
1011 }
1012 if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr))
1013 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx);
1014
1015 if (len < (int)sizeof(struct rip6)) {
1016 trace(1, "Packet too short\n");
1017 return;
1018 }
1019
1020 nh = fsock.sin6_addr;
1021 nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) /
1022 sizeof(struct netinfo6);
1023 rp = (struct rip6 *)buf;
1024 np = rp->rip6_nets;
1025
1026 if (rp->rip6_vers != RIP6_VERSION) {
1027 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers);
1028 return;
1029 }
1030 if (rp->rip6_cmd == RIP6_REQUEST) {
1031 if (idx && idx < (unsigned)nindex2ifc) {
1032 ifcp = index2ifc[idx];
1033 riprequest(ifcp, np, nn, &fsock);
1034 } else {
1035 riprequest(NULL, np, nn, &fsock);
1036 }
1037 return;
1038 }
1039
1040 if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) {
1041 trace(1, "Packets from non-ll addr: %s\n",
1042 inet6_n2p(&fsock.sin6_addr));
1043 return; /* Ignore packets from non-link-local addr */
1044 }
1045 idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr);
1046 ifcp = (idx < (unsigned)nindex2ifc) ? index2ifc[idx] : NULL;
1047 if (!ifcp) {
1048 trace(1, "Packets to unknown interface index %d\n", idx);
1049 return; /* Ignore it */
1050 }
1051 if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr))
1052 return; /* The packet is from me; ignore */
1053 if (rp->rip6_cmd != RIP6_RESPONSE) {
1054 trace(1, "Invalid command %d\n", rp->rip6_cmd);
1055 return;
1056 }
1057
1058 /* -N: no use */
1059 if (iff_find(ifcp, 'N') != NULL)
1060 return;
1061
1062 tracet(1, "Recv(%s): from %s.%d info(%d)\n",
1063 ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), (int)nn);
1064
1065 t = time(NULL);
1066 t_half_lifetime = t - (RIP_LIFETIME/2);
1067 for (; nn; nn--, np++) {
1068 if (np->rip6_metric == NEXTHOP_METRIC) {
1069 /* modify neighbor address */
1070 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1071 nh = np->rip6_dest;
1072 SET_IN6_LINKLOCAL_IFINDEX(nh, idx);
1073 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1074 } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) {
1075 nh = fsock.sin6_addr;
1076 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1077 } else {
1078 nh = fsock.sin6_addr;
1079 trace(1, "\tInvalid Nexthop: %s\n",
1080 inet6_n2p(&np->rip6_dest));
1081 }
1082 continue;
1083 }
1084 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) {
1085 trace(1, "\tMulticast netinfo6: %s/%d [%d]\n",
1086 inet6_n2p(&np->rip6_dest),
1087 np->rip6_plen, np->rip6_metric);
1088 continue;
1089 }
1090 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) {
1091 trace(1, "\tLoopback netinfo6: %s/%d [%d]\n",
1092 inet6_n2p(&np->rip6_dest),
1093 np->rip6_plen, np->rip6_metric);
1094 continue;
1095 }
1096 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1097 trace(1, "\tLink Local netinfo6: %s/%d [%d]\n",
1098 inet6_n2p(&np->rip6_dest),
1099 np->rip6_plen, np->rip6_metric);
1100 continue;
1101 }
1102 /* may need to pass sitelocal prefix in some case, however*/
1103 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) {
1104 trace(1, "\tSite Local netinfo6: %s/%d [%d]\n",
1105 inet6_n2p(&np->rip6_dest),
1106 np->rip6_plen, np->rip6_metric);
1107 continue;
1108 }
1109 trace(2, "\tnetinfo6: %s/%d [%d]",
1110 inet6_n2p(&np->rip6_dest),
1111 np->rip6_plen, np->rip6_metric);
1112 if (np->rip6_tag)
1113 trace(2, " tag=0x%04x", ntohs(np->rip6_tag) & 0xffff);
1114 if (dflag >= 2) {
1115 ia = np->rip6_dest;
1116 applyplen(&ia, np->rip6_plen);
1117 if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest))
1118 trace(2, " [junk outside prefix]");
1119 }
1120
1121 /*
1122 * -L: listen only if the prefix matches the configuration
1123 */
1124 ok = 1; /* if there's no L filter, it is ok */
1125 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
1126 if (iffp->iff_type != 'L')
1127 continue;
1128 ok = 0;
1129 if (np->rip6_plen < iffp->iff_plen)
1130 continue;
1131 /* special rule: ::/0 means default, not "in /0" */
1132 if (iffp->iff_plen == 0 && np->rip6_plen > 0)
1133 continue;
1134 ia = np->rip6_dest;
1135 applyplen(&ia, iffp->iff_plen);
1136 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
1137 ok = 1;
1138 break;
1139 }
1140 }
1141 if (!ok) {
1142 trace(2, " (filtered)\n");
1143 continue;
1144 }
1145
1146 trace(2, "\n");
1147 np->rip6_metric++;
1148 np->rip6_metric += ifcp->ifc_metric;
1149 if (np->rip6_metric > HOPCNT_INFINITY6)
1150 np->rip6_metric = HOPCNT_INFINITY6;
1151
1152 applyplen(&np->rip6_dest, np->rip6_plen);
1153 if ((rrt = rtsearch(np, NULL)) != NULL) {
1154 if (rrt->rrt_t == 0)
1155 continue; /* Intf route has priority */
1156 nq = &rrt->rrt_info;
1157 if (nq->rip6_metric > np->rip6_metric) {
1158 if (rrt->rrt_index == ifcp->ifc_index &&
1159 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1160 /* Small metric from the same gateway */
1161 nq->rip6_metric = np->rip6_metric;
1162 } else {
1163 /* Better route found */
1164 rrt->rrt_index = ifcp->ifc_index;
1165 /* Update routing table */
1166 delroute(nq, &rrt->rrt_gw);
1167 rrt->rrt_gw = nh;
1168 *nq = *np;
1169 addroute(rrt, &nh, ifcp);
1170 }
1171 rrt->rrt_rflags |= RRTF_CHANGED;
1172 rrt->rrt_t = t;
1173 need_trigger = 1;
1174 } else if (nq->rip6_metric < np->rip6_metric &&
1175 rrt->rrt_index == ifcp->ifc_index &&
1176 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1177 /* Got worse route from same gw */
1178 nq->rip6_metric = np->rip6_metric;
1179 rrt->rrt_t = t;
1180 rrt->rrt_rflags |= RRTF_CHANGED;
1181 need_trigger = 1;
1182 } else if (nq->rip6_metric == np->rip6_metric &&
1183 np->rip6_metric < HOPCNT_INFINITY6) {
1184 if (rrt->rrt_index == ifcp->ifc_index &&
1185 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1186 /* same metric, same route from same gw */
1187 rrt->rrt_t = t;
1188 } else if (rrt->rrt_t < t_half_lifetime) {
1189 /* Better route found */
1190 rrt->rrt_index = ifcp->ifc_index;
1191 /* Update routing table */
1192 delroute(nq, &rrt->rrt_gw);
1193 rrt->rrt_gw = nh;
1194 *nq = *np;
1195 addroute(rrt, &nh, ifcp);
1196 rrt->rrt_rflags |= RRTF_CHANGED;
1197 rrt->rrt_t = t;
1198 }
1199 }
1200 /*
1201 * if nq->rip6_metric == HOPCNT_INFINITY6 then
1202 * do not update age value. Do nothing.
1203 */
1204 } else if (np->rip6_metric < HOPCNT_INFINITY6) {
1205 /* Got a new valid route */
1206 if ((rrt = MALLOC(struct riprt)) == NULL) {
1207 fatal("malloc: struct riprt");
1208 }
1209 memset(rrt, 0, sizeof(*rrt));
1210 nq = &rrt->rrt_info;
1211
1212 rrt->rrt_same = NULL;
1213 rrt->rrt_index = ifcp->ifc_index;
1214 rrt->rrt_flags = RTF_UP|RTF_GATEWAY;
1215 rrt->rrt_gw = nh;
1216 *nq = *np;
1217 applyplen(&nq->rip6_dest, nq->rip6_plen);
1218 if (nq->rip6_plen == sizeof(struct in6_addr) * 8)
1219 rrt->rrt_flags |= RTF_HOST;
1220
1221 /* Put the route to the list */
1222 rrt->rrt_next = riprt;
1223 riprt = rrt;
1224 /* Update routing table */
1225 addroute(rrt, &nh, ifcp);
1226 rrt->rrt_rflags |= RRTF_CHANGED;
1227 need_trigger = 1;
1228 rrt->rrt_t = t;
1229 }
1230 }
1231 /* XXX need to care the interval between triggered updates */
1232 if (need_trigger) {
1233 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) {
1234 for (ic = ifc; ic; ic = ic->ifc_next) {
1235 if (ifcp->ifc_index == ic->ifc_index)
1236 continue;
1237 if (ic->ifc_flags & IFF_UP)
1238 ripsend(ic, &ic->ifc_ripsin,
1239 RRTF_CHANGED);
1240 }
1241 }
1242 /* Reset the flag */
1243 for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1244 rrt->rrt_rflags &= ~RRTF_CHANGED;
1245 }
1246 }
1247
1248 /*
1249 * Send all routes request packet to the specified interface.
1250 */
1251 static void
sendrequest(struct ifc * ifcp)1252 sendrequest(struct ifc *ifcp)
1253 {
1254 struct netinfo6 *np;
1255 int error;
1256
1257 if (ifcp->ifc_flags & IFF_LOOPBACK)
1258 return;
1259 ripbuf->rip6_cmd = RIP6_REQUEST;
1260 np = ripbuf->rip6_nets;
1261 memset(np, 0, sizeof(struct netinfo6));
1262 np->rip6_metric = HOPCNT_INFINITY6;
1263 tracet(1, "Send rtdump Request to %s (%s)\n",
1264 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1265 error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
1266 if (error == EAFNOSUPPORT) {
1267 /* Protocol not supported */
1268 tracet(1, "Could not send rtdump Request to %s (%s): "
1269 "set IFF_UP to 0\n",
1270 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1271 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */
1272 }
1273 ripbuf->rip6_cmd = RIP6_RESPONSE;
1274 }
1275
1276 /*
1277 * Process a RIP6_REQUEST packet.
1278 */
1279 static void
riprequest(struct ifc * ifcp,struct netinfo6 * np,int nn,struct sockaddr_in6 * sin6)1280 riprequest(struct ifc *ifcp, struct netinfo6 *np, int nn,
1281 struct sockaddr_in6 *sin6)
1282 {
1283 int i;
1284 struct riprt *rrt;
1285
1286 if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) &&
1287 np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) {
1288 /* Specific response, don't split-horizon */
1289 trace(1, "\tRIP Request\n");
1290 for (i = 0; i < nn; i++, np++) {
1291 rrt = rtsearch(np, NULL);
1292 if (rrt)
1293 np->rip6_metric = rrt->rrt_info.rip6_metric;
1294 else
1295 np->rip6_metric = HOPCNT_INFINITY6;
1296 }
1297 (void)sendpacket(sin6, RIPSIZE(nn));
1298 return;
1299 }
1300 /* Whole routing table dump */
1301 trace(1, "\tRIP Request -- whole routing table\n");
1302 ripsend(ifcp, sin6, RRTF_SENDANYWAY);
1303 }
1304
1305 /*
1306 * Get information of each interface.
1307 */
1308 static void
ifconfig(void)1309 ifconfig(void)
1310 {
1311 struct ifaddrs *ifap, *ifa;
1312 struct ifc *ifcp;
1313 struct ipv6_mreq mreq;
1314 int s;
1315
1316 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
1317 fatal("socket");
1318 }
1319
1320 if (getifaddrs(&ifap) != 0) {
1321 fatal("getifaddrs");
1322 }
1323
1324 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1325 if (ifa->ifa_addr->sa_family != AF_INET6)
1326 continue;
1327 ifcp = ifc_find(ifa->ifa_name);
1328 /* we are interested in multicast-capable interfaces */
1329 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
1330 continue;
1331 if (!ifcp) {
1332 /* new interface */
1333 if ((ifcp = MALLOC(struct ifc)) == NULL) {
1334 fatal("malloc: struct ifc");
1335 }
1336 memset(ifcp, 0, sizeof(*ifcp));
1337 ifcp->ifc_index = -1;
1338 ifcp->ifc_next = ifc;
1339 ifc = ifcp;
1340 nifc++;
1341 ifcp->ifc_name = xstrdup(ifa->ifa_name);
1342 ifcp->ifc_addr = 0;
1343 ifcp->ifc_filter = 0;
1344 ifcp->ifc_flags = ifa->ifa_flags;
1345 trace(1, "newif %s <%s>\n", ifcp->ifc_name,
1346 ifflags(ifcp->ifc_flags));
1347 if (!strcmp(ifcp->ifc_name, LOOPBACK_IF))
1348 loopifcp = ifcp;
1349 } else {
1350 /* update flag, this may be up again */
1351 if (ifcp->ifc_flags != ifa->ifa_flags) {
1352 trace(1, "%s: <%s> -> ", ifcp->ifc_name,
1353 ifflags(ifcp->ifc_flags));
1354 trace(1, "<%s>\n", ifflags(ifa->ifa_flags));
1355 ifcp->ifc_cflags |= IFC_CHANGED;
1356 }
1357 ifcp->ifc_flags = ifa->ifa_flags;
1358 }
1359 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s);
1360 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP
1361 && 0 < ifcp->ifc_index && !ifcp->ifc_joined) {
1362 mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr;
1363 mreq.ipv6mr_interface = ifcp->ifc_index;
1364 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1365 &mreq, sizeof(mreq)) < 0) {
1366 fatal("IPV6_JOIN_GROUP");
1367 }
1368 trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST);
1369 ifcp->ifc_joined++;
1370 }
1371 }
1372 close(s);
1373 freeifaddrs(ifap);
1374 }
1375
1376 static void
ifconfig1(const char * name,const struct sockaddr * sa,struct ifc * ifcp,int s)1377 ifconfig1(const char *name, const struct sockaddr *sa, struct ifc *ifcp, int s)
1378 {
1379 struct in6_ifreq ifr;
1380 const struct sockaddr_in6 *sin6;
1381 struct ifac *ifa;
1382 int plen;
1383 char buf[BUFSIZ];
1384
1385 sin6 = (const struct sockaddr_in6 *)sa;
1386 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) && !lflag)
1387 return;
1388 ifr.ifr_addr = *sin6;
1389 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1390 if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) {
1391 fatal("ioctl: SIOCGIFNETMASK_IN6");
1392 }
1393 plen = sin6mask2len(&ifr.ifr_addr);
1394 if ((ifa = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) {
1395 /* same interface found */
1396 /* need check if something changed */
1397 /* XXX not yet implemented */
1398 return;
1399 }
1400 /*
1401 * New address is found
1402 */
1403 if ((ifa = MALLOC(struct ifac)) == NULL) {
1404 fatal("malloc: struct ifac");
1405 }
1406 memset(ifa, 0, sizeof(*ifa));
1407 ifa->ifa_conf = ifcp;
1408 ifa->ifa_next = ifcp->ifc_addr;
1409 ifcp->ifc_addr = ifa;
1410 ifa->ifa_addr = sin6->sin6_addr;
1411 ifa->ifa_plen = plen;
1412 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1413 ifr.ifr_addr = *sin6;
1414 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) {
1415 fatal("ioctl: SIOCGIFDSTADDR_IN6");
1416 }
1417 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr;
1418 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf));
1419 trace(1, "found address %s/%d -- %s\n",
1420 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf);
1421 } else {
1422 trace(1, "found address %s/%d\n",
1423 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen);
1424 }
1425 if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1426 ifcp->ifc_mylladdr = ifa->ifa_addr;
1427 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr);
1428 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len);
1429 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr,
1430 ifcp->ifc_index);
1431 setindex2ifc(ifcp->ifc_index, ifcp);
1432 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index);
1433 if (ifcp->ifc_mtu > RIP6_MAXMTU)
1434 ifcp->ifc_mtu = RIP6_MAXMTU;
1435 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) {
1436 fatal("ioctl: SIOCGIFMETRIC");
1437 }
1438 ifcp->ifc_metric = ifr.ifr_metric;
1439 trace(1, "\tindex: %d, mtu: %d, metric: %d\n",
1440 ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric);
1441 } else
1442 ifcp->ifc_cflags |= IFC_CHANGED;
1443 }
1444
1445 /*
1446 * Receive and process routing messages.
1447 * Update interface information as necessary.
1448 */
1449 static void
rtrecv(void)1450 rtrecv(void)
1451 {
1452 char buf[BUFSIZ];
1453 char *p, *q;
1454 struct rt_msghdr *rtm;
1455 struct ifa_msghdr *ifam;
1456 struct if_msghdr *ifm;
1457 int len;
1458 struct ifc *ifcp, *ic;
1459 int iface = 0, rtable = 0;
1460 struct sockaddr_in6 *rta[RTAX_MAX];
1461 struct sockaddr_in6 mask;
1462 int i, addrs;
1463 struct riprt *rrt;
1464
1465 if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
1466 perror("read from rtsock");
1467 exit(1);
1468 }
1469 if (len < (int)sizeof(*rtm)) {
1470 trace(1, "short read from rtsock: %d (should be > %lu)\n",
1471 len, (u_long)sizeof(*rtm));
1472 return;
1473 }
1474 if (dflag >= 2) {
1475 fprintf(stderr, "rtmsg:\n");
1476 for (i = 0; i < len; i++) {
1477 fprintf(stderr, "%02x ", buf[i] & 0xff);
1478 if (i % 16 == 15) fprintf(stderr, "\n");
1479 }
1480 fprintf(stderr, "\n");
1481 }
1482
1483 for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) {
1484 /* safety against bogus message */
1485 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) {
1486 trace(1, "bogus rtmsg: length=%d\n",
1487 ((struct rt_msghdr *)p)->rtm_msglen);
1488 break;
1489 }
1490 rtm = NULL;
1491 ifam = NULL;
1492 ifm = NULL;
1493 switch (((struct rt_msghdr *)p)->rtm_type) {
1494 case RTM_NEWADDR:
1495 case RTM_DELADDR:
1496 ifam = (struct ifa_msghdr *)p;
1497 addrs = ifam->ifam_addrs;
1498 q = (char *)(ifam + 1);
1499 break;
1500 case RTM_IFINFO:
1501 ifm = (struct if_msghdr *)p;
1502 addrs = ifm->ifm_addrs;
1503 q = (char *)(ifm + 1);
1504 break;
1505 default:
1506 rtm = (struct rt_msghdr *)p;
1507 addrs = rtm->rtm_addrs;
1508 q = (char *)(rtm + 1);
1509 if (rtm->rtm_version != RTM_VERSION) {
1510 trace(1, "unexpected rtmsg version %d "
1511 "(should be %d)\n",
1512 rtm->rtm_version, RTM_VERSION);
1513 continue;
1514 }
1515 if (rtm->rtm_pid == pid) {
1516 #if 0
1517 trace(1, "rtmsg looped back to me, ignored\n");
1518 #endif
1519 continue;
1520 }
1521 break;
1522 }
1523 memset(&rta, 0, sizeof(rta));
1524 for (i = 0; i < RTAX_MAX; i++) {
1525 if (addrs & (1 << i)) {
1526 rta[i] = (struct sockaddr_in6 *)q;
1527 q += ROUNDUP(rta[i]->sin6_len);
1528 }
1529 }
1530
1531 trace(1, "rtsock: %s (addrs=%x)\n",
1532 rttypes((struct rt_msghdr *)p), addrs);
1533 if (dflag >= 2) {
1534 for (i = 0;
1535 i < ((struct rt_msghdr *)p)->rtm_msglen;
1536 i++) {
1537 fprintf(stderr, "%02x ", p[i] & 0xff);
1538 if (i % 16 == 15) fprintf(stderr, "\n");
1539 }
1540 fprintf(stderr, "\n");
1541 }
1542
1543 /*
1544 * Easy ones first.
1545 *
1546 * We may be able to optimize by using ifm->ifm_index or
1547 * ifam->ifam_index. For simplicity we don't do that here.
1548 */
1549 switch (((struct rt_msghdr *)p)->rtm_type) {
1550 case RTM_NEWADDR:
1551 case RTM_IFINFO:
1552 iface++;
1553 continue;
1554 case RTM_ADD:
1555 rtable++;
1556 continue;
1557 case RTM_LOSING:
1558 case RTM_MISS:
1559 case RTM_GET:
1560 case RTM_LOCK:
1561 /* nothing to be done here */
1562 trace(1, "\tnothing to be done, ignored\n");
1563 continue;
1564 }
1565
1566 #if 0
1567 if (rta[RTAX_DST] == NULL) {
1568 trace(1, "\tno destination, ignored\n");
1569 continue;
1570 }
1571 if (rta[RTAX_DST]->sin6_family != AF_INET6) {
1572 trace(1, "\taf mismatch, ignored\n");
1573 continue;
1574 }
1575 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) {
1576 trace(1, "\tlinklocal destination, ignored\n");
1577 continue;
1578 }
1579 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) {
1580 trace(1, "\tloopback destination, ignored\n");
1581 continue; /* Loopback */
1582 }
1583 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) {
1584 trace(1, "\tmulticast destination, ignored\n");
1585 continue;
1586 }
1587 #endif
1588
1589 /* hard ones */
1590 switch (((struct rt_msghdr *)p)->rtm_type) {
1591 case RTM_NEWADDR:
1592 case RTM_IFINFO:
1593 case RTM_ADD:
1594 case RTM_LOSING:
1595 case RTM_MISS:
1596 case RTM_GET:
1597 case RTM_LOCK:
1598 /* should already be handled */
1599 fatal("rtrecv: never reach here");
1600 /* NOTREACHED */
1601 case RTM_DELETE:
1602 if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) {
1603 trace(1, "\tsome of dst/gw/netamsk are "
1604 "unavailable, ignored\n");
1605 break;
1606 }
1607 if ((rtm->rtm_flags & RTF_HOST) != 0) {
1608 mask.sin6_len = sizeof(mask);
1609 memset(&mask.sin6_addr, 0xff,
1610 sizeof(mask.sin6_addr));
1611 rta[RTAX_NETMASK] = &mask;
1612 } else if (!rta[RTAX_NETMASK]) {
1613 trace(1, "\tsome of dst/gw/netamsk are "
1614 "unavailable, ignored\n");
1615 break;
1616 }
1617 if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY],
1618 rta[RTAX_NETMASK]) == 0) {
1619 rtable++; /*just to be sure*/
1620 }
1621 break;
1622 case RTM_CHANGE:
1623 case RTM_REDIRECT:
1624 trace(1, "\tnot supported yet, ignored\n");
1625 break;
1626 case RTM_DELADDR:
1627 if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) {
1628 trace(1, "\tno netmask or ifa given, ignored\n");
1629 break;
1630 }
1631 if (ifam->ifam_index < nindex2ifc)
1632 ifcp = index2ifc[ifam->ifam_index];
1633 else
1634 ifcp = NULL;
1635 if (!ifcp) {
1636 trace(1, "\tinvalid ifam_index %d, ignored\n",
1637 ifam->ifam_index);
1638 break;
1639 }
1640 if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK]))
1641 iface++;
1642 break;
1643 case RTM_OLDADD:
1644 case RTM_OLDDEL:
1645 trace(1, "\tnot supported yet, ignored\n");
1646 break;
1647 }
1648
1649 }
1650
1651 if (iface) {
1652 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n");
1653 ifconfig();
1654 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
1655 if (ifcp->ifc_cflags & IFC_CHANGED) {
1656 if (ifrt(ifcp, 1)) {
1657 for (ic = ifc; ic; ic = ic->ifc_next) {
1658 if (ifcp->ifc_index == ic->ifc_index)
1659 continue;
1660 if (ic->ifc_flags & IFF_UP)
1661 ripsend(ic, &ic->ifc_ripsin,
1662 RRTF_CHANGED);
1663 }
1664 /* Reset the flag */
1665 for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1666 rrt->rrt_rflags &= ~RRTF_CHANGED;
1667 }
1668 ifcp->ifc_cflags &= ~IFC_CHANGED;
1669 }
1670 }
1671 if (rtable) {
1672 trace(1, "rtsock: read routing table again\n");
1673 krtread(1);
1674 }
1675 }
1676
1677 /*
1678 * remove specified route from the internal routing table.
1679 */
1680 static int
rt_del(const struct sockaddr_in6 * sdst,const struct sockaddr_in6 * sgw,const struct sockaddr_in6 * smask)1681 rt_del(const struct sockaddr_in6 *sdst, const struct sockaddr_in6 *sgw,
1682 const struct sockaddr_in6 *smask)
1683 {
1684 const struct in6_addr *dst = NULL;
1685 const struct in6_addr *gw = NULL;
1686 int prefix;
1687 struct netinfo6 ni6;
1688 struct riprt *rrt = NULL;
1689 time_t t_lifetime;
1690
1691 if (sdst->sin6_family != AF_INET6) {
1692 trace(1, "\tother AF, ignored\n");
1693 return -1;
1694 }
1695 if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr)
1696 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback)
1697 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) {
1698 trace(1, "\taddress %s not interesting, ignored\n",
1699 inet6_n2p(&sdst->sin6_addr));
1700 return -1;
1701 }
1702 dst = &sdst->sin6_addr;
1703 if (sgw->sin6_family == AF_INET6) {
1704 /* easy case */
1705 gw = &sgw->sin6_addr;
1706 prefix = sin6mask2len(smask);
1707 } else if (sgw->sin6_family == AF_LINK) {
1708 /*
1709 * Interface route... a hard case. We need to get the prefix
1710 * length from the kernel, but we now are parsing rtmsg.
1711 * We'll purge matching routes from my list, then get the
1712 * fresh list.
1713 */
1714 struct riprt *longest;
1715 trace(1, "\t%s is an interface route, guessing prefixlen\n",
1716 inet6_n2p(dst));
1717 longest = NULL;
1718 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
1719 if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
1720 &sdst->sin6_addr)
1721 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
1722 if (!longest
1723 || longest->rrt_info.rip6_plen <
1724 rrt->rrt_info.rip6_plen) {
1725 longest = rrt;
1726 }
1727 }
1728 }
1729 rrt = longest;
1730 if (!rrt) {
1731 trace(1, "\tno matching interface route found\n");
1732 return -1;
1733 }
1734 gw = &in6addr_loopback;
1735 prefix = rrt->rrt_info.rip6_plen;
1736 } else {
1737 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family);
1738 return -1;
1739 }
1740
1741 trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix);
1742 trace(1, "gw %s\n", inet6_n2p(gw));
1743 t_lifetime = time(NULL) - RIP_LIFETIME;
1744 /* age route for interface address */
1745 memset(&ni6, 0, sizeof(ni6));
1746 ni6.rip6_dest = *dst;
1747 ni6.rip6_plen = prefix;
1748 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/
1749 trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest),
1750 ni6.rip6_plen);
1751 if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) {
1752 trace(1, "\tno route found\n");
1753 return -1;
1754 }
1755 #if 0
1756 if ((rrt->rrt_flags & RTF_STATIC) == 0) {
1757 trace(1, "\tyou can delete static routes only\n");
1758 } else
1759 #endif
1760 if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) {
1761 trace(1, "\tgw mismatch: %s <-> ",
1762 inet6_n2p(&rrt->rrt_gw));
1763 trace(1, "%s\n", inet6_n2p(gw));
1764 } else {
1765 trace(1, "\troute found, age it\n");
1766 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1767 rrt->rrt_t = t_lifetime;
1768 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1769 }
1770 }
1771 return 0;
1772 }
1773
1774 /*
1775 * remove specified address from internal interface/routing table.
1776 */
1777 static int
rt_deladdr(struct ifc * ifcp,const struct sockaddr_in6 * sifa,const struct sockaddr_in6 * smask)1778 rt_deladdr(struct ifc *ifcp, const struct sockaddr_in6 *sifa,
1779 const struct sockaddr_in6 *smask)
1780 {
1781 const struct in6_addr *addr = NULL;
1782 int prefix;
1783 struct ifac *ifa = NULL;
1784 struct netinfo6 ni6;
1785 struct riprt *rrt = NULL;
1786 time_t t_lifetime;
1787 int updated = 0;
1788
1789 if (sifa->sin6_family != AF_INET6) {
1790 trace(1, "\tother AF, ignored\n");
1791 return -1;
1792 }
1793 addr = &sifa->sin6_addr;
1794 prefix = sin6mask2len(smask);
1795
1796 trace(1, "\tdeleting %s/%d from %s\n",
1797 inet6_n2p(addr), prefix, ifcp->ifc_name);
1798 ifa = ifa_match(ifcp, addr, prefix);
1799 if (!ifa) {
1800 trace(1, "\tno matching ifa found for %s/%d on %s\n",
1801 inet6_n2p(addr), prefix, ifcp->ifc_name);
1802 return -1;
1803 }
1804 if (ifa->ifa_conf != ifcp) {
1805 trace(1, "\taddress table corrupt: back pointer does not match "
1806 "(%s != %s)\n",
1807 ifcp->ifc_name, ifa->ifa_conf->ifc_name);
1808 return -1;
1809 }
1810 /* remove ifa from interface */
1811 if (ifcp->ifc_addr == ifa)
1812 ifcp->ifc_addr = ifa->ifa_next;
1813 else {
1814 struct ifac *p;
1815 for (p = ifcp->ifc_addr; p; p = p->ifa_next) {
1816 if (p->ifa_next == ifa) {
1817 p->ifa_next = ifa->ifa_next;
1818 break;
1819 }
1820 }
1821 }
1822 ifa->ifa_next = NULL;
1823 ifa->ifa_conf = NULL;
1824 t_lifetime = time(NULL) - RIP_LIFETIME;
1825 /* age route for interface address */
1826 memset(&ni6, 0, sizeof(ni6));
1827 ni6.rip6_dest = ifa->ifa_addr;
1828 ni6.rip6_plen = ifa->ifa_plen;
1829 applyplen(&ni6.rip6_dest, ni6.rip6_plen);
1830 trace(1, "\tfind interface route %s/%d on %d\n",
1831 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index);
1832 if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1833 struct in6_addr none;
1834 memset(&none, 0, sizeof(none));
1835 if (rrt->rrt_index == ifcp->ifc_index &&
1836 (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) ||
1837 IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) {
1838 trace(1, "\troute found, age it\n");
1839 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1840 rrt->rrt_t = t_lifetime;
1841 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1842 }
1843 updated++;
1844 } else {
1845 trace(1, "\tnon-interface route found: %s/%d on %d\n",
1846 inet6_n2p(&rrt->rrt_info.rip6_dest),
1847 rrt->rrt_info.rip6_plen,
1848 rrt->rrt_index);
1849 }
1850 } else
1851 trace(1, "\tno interface route found\n");
1852 /* age route for p2p destination */
1853 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1854 memset(&ni6, 0, sizeof(ni6));
1855 ni6.rip6_dest = ifa->ifa_raddr;
1856 ni6.rip6_plen = 128;
1857 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/
1858 trace(1, "\tfind p2p route %s/%d on %d\n",
1859 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen,
1860 ifcp->ifc_index);
1861 if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1862 if (rrt->rrt_index == ifcp->ifc_index &&
1863 IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) {
1864 trace(1, "\troute found, age it\n");
1865 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1866 rrt->rrt_t = t_lifetime;
1867 rrt->rrt_info.rip6_metric =
1868 HOPCNT_INFINITY6;
1869 updated++;
1870 }
1871 } else {
1872 trace(1, "\tnon-p2p route found: %s/%d on %d\n",
1873 inet6_n2p(&rrt->rrt_info.rip6_dest),
1874 rrt->rrt_info.rip6_plen,
1875 rrt->rrt_index);
1876 }
1877 } else
1878 trace(1, "\tno p2p route found\n");
1879 }
1880 return updated ? 0 : -1;
1881 }
1882
1883 /*
1884 * Get each interface address and put those interface routes to the route
1885 * list.
1886 */
1887 static int
ifrt(struct ifc * ifcp,int again)1888 ifrt(struct ifc *ifcp, int again)
1889 {
1890 struct ifac *ifa;
1891 struct riprt *rrt = NULL, *search_rrt, *prev_rrt, *loop_rrt;
1892 struct netinfo6 *np;
1893 time_t t_lifetime;
1894 int need_trigger = 0;
1895
1896 #if 0
1897 if (ifcp->ifc_flags & IFF_LOOPBACK)
1898 return 0; /* ignore loopback */
1899 #endif
1900
1901 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1902 ifrt_p2p(ifcp, again);
1903 return 0;
1904 }
1905
1906 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
1907 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1908 #if 0
1909 trace(1, "route: %s on %s: "
1910 "skip linklocal interface address\n",
1911 inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name);
1912 #endif
1913 continue;
1914 }
1915 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) {
1916 #if 0
1917 trace(1, "route: %s: skip unspec interface address\n",
1918 ifcp->ifc_name);
1919 #endif
1920 continue;
1921 }
1922 if (IN6_IS_ADDR_LOOPBACK(&ifa->ifa_addr)) {
1923 #if 0
1924 trace(1, "route: %s: skip loopback address\n",
1925 ifcp->ifc_name);
1926 #endif
1927 continue;
1928 }
1929 if (ifcp->ifc_flags & IFF_UP) {
1930 if ((rrt = MALLOC(struct riprt)) == NULL)
1931 fatal("malloc: struct riprt");
1932 memset(rrt, 0, sizeof(*rrt));
1933 rrt->rrt_same = NULL;
1934 rrt->rrt_index = ifcp->ifc_index;
1935 rrt->rrt_t = 0; /* don't age */
1936 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
1937 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
1938 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
1939 rrt->rrt_info.rip6_plen = ifa->ifa_plen;
1940 if (ifa->ifa_plen == 128)
1941 rrt->rrt_flags = RTF_HOST;
1942 else
1943 rrt->rrt_flags = RTF_CONNECTED;
1944 rrt->rrt_rflags |= RRTF_CHANGED;
1945 applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen);
1946 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
1947 rrt->rrt_gw = ifa->ifa_addr;
1948 np = &rrt->rrt_info;
1949 search_rrt = rtsearch(np, &prev_rrt);
1950 if (search_rrt != NULL) {
1951 if (search_rrt->rrt_info.rip6_metric <=
1952 rrt->rrt_info.rip6_metric) {
1953 /* Already have better route */
1954 if (!again) {
1955 trace(1, "route: %s/%d: "
1956 "already registered (%s)\n",
1957 inet6_n2p(&np->rip6_dest), np->rip6_plen,
1958 ifcp->ifc_name);
1959 }
1960 goto next;
1961 }
1962
1963 if (prev_rrt)
1964 prev_rrt->rrt_next = rrt->rrt_next;
1965 else
1966 riprt = rrt->rrt_next;
1967 delroute(&rrt->rrt_info, &rrt->rrt_gw);
1968 }
1969 /* Attach the route to the list */
1970 trace(1, "route: %s/%d: register route (%s)\n",
1971 inet6_n2p(&np->rip6_dest), np->rip6_plen,
1972 ifcp->ifc_name);
1973 rrt->rrt_next = riprt;
1974 riprt = rrt;
1975 addroute(rrt, &rrt->rrt_gw, ifcp);
1976 rrt = NULL;
1977 sendrequest(ifcp);
1978 ripsend(ifcp, &ifcp->ifc_ripsin, 0);
1979 need_trigger = 1;
1980 } else {
1981 for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) {
1982 if (loop_rrt->rrt_index == ifcp->ifc_index) {
1983 t_lifetime = time(NULL) - RIP_LIFETIME;
1984 if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) {
1985 loop_rrt->rrt_t = t_lifetime;
1986 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1987 loop_rrt->rrt_rflags |= RRTF_CHANGED;
1988 need_trigger = 1;
1989 }
1990 }
1991 }
1992 }
1993 next:
1994 if (rrt)
1995 free(rrt);
1996 }
1997 return need_trigger;
1998 }
1999
2000 /*
2001 * there are couple of p2p interface routing models. "behavior" lets
2002 * you pick one. it looks that gated behavior fits best with BSDs,
2003 * since BSD kernels do not look at prefix length on p2p interfaces.
2004 */
2005 static void
ifrt_p2p(struct ifc * ifcp,int again)2006 ifrt_p2p(struct ifc *ifcp, int again)
2007 {
2008 struct ifac *ifa;
2009 struct riprt *rrt, *orrt, *prevrrt;
2010 struct netinfo6 *np;
2011 struct in6_addr addr, dest;
2012 int advert, ignore, i;
2013 #define P2PADVERT_NETWORK 1
2014 #define P2PADVERT_ADDR 2
2015 #define P2PADVERT_DEST 4
2016 #define P2PADVERT_MAX 4
2017 #define CISCO 0
2018 #define GATED 1
2019 #define ROUTE6D 2
2020 #define BEHAVIOR GATED
2021 const char *category = "";
2022 const char *noadv;
2023
2024 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2025 addr = ifa->ifa_addr;
2026 dest = ifa->ifa_raddr;
2027 applyplen(&addr, ifa->ifa_plen);
2028 applyplen(&dest, ifa->ifa_plen);
2029 advert = ignore = 0;
2030 #if BEHAVIOR == CISCO
2031 /*
2032 * honor addr/plen, just like normal shared medium
2033 * interface. this may cause trouble if you reuse
2034 * addr/plen on other interfaces.
2035 *
2036 * advertise addr/plen.
2037 */
2038 advert |= P2PADVERT_NETWORK;
2039 #endif
2040 #if BEHAVIOR == GATED
2041 /*
2042 * prefixlen on p2p interface is meaningless.
2043 * advertise addr/128 and dest/128.
2044 *
2045 * do not install network route to route6d routing
2046 * table (if we do, it would prevent route installation
2047 * for other p2p interface that shares addr/plen).
2048 *
2049 * XXX what should we do if dest is ::? it will not
2050 * get announced anyways (see following filter),
2051 * but we need to think.
2052 */
2053 advert |= P2PADVERT_ADDR;
2054 advert |= P2PADVERT_DEST;
2055 ignore |= P2PADVERT_NETWORK;
2056 #endif
2057 #if BEHAVIOR == ROUTE6D
2058 /*
2059 * just for testing. actually the code is redundant
2060 * given the current p2p interface address assignment
2061 * rule for kame kernel.
2062 *
2063 * intent:
2064 * A/n -> announce A/n
2065 * A B/n, A and B share prefix -> A/n (= B/n)
2066 * A B/n, do not share prefix -> A/128 and B/128
2067 * actually, A/64 and A B/128 are the only cases
2068 * permitted by the kernel:
2069 * A/64 -> A/64
2070 * A B/128 -> A/128 and B/128
2071 */
2072 if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) {
2073 if (IN6_ARE_ADDR_EQUAL(&addr, &dest))
2074 advert |= P2PADVERT_NETWORK;
2075 else {
2076 advert |= P2PADVERT_ADDR;
2077 advert |= P2PADVERT_DEST;
2078 ignore |= P2PADVERT_NETWORK;
2079 }
2080 } else
2081 advert |= P2PADVERT_NETWORK;
2082 #endif
2083
2084 for (i = 1; i <= P2PADVERT_MAX; i *= 2) {
2085 if ((ignore & i) != 0)
2086 continue;
2087 if ((rrt = MALLOC(struct riprt)) == NULL) {
2088 fatal("malloc: struct riprt");
2089 }
2090 memset(rrt, 0, sizeof(*rrt));
2091 rrt->rrt_same = NULL;
2092 rrt->rrt_index = ifcp->ifc_index;
2093 rrt->rrt_t = 0; /* don't age */
2094 switch (i) {
2095 case P2PADVERT_NETWORK:
2096 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2097 rrt->rrt_info.rip6_plen = ifa->ifa_plen;
2098 applyplen(&rrt->rrt_info.rip6_dest,
2099 ifa->ifa_plen);
2100 category = "network";
2101 break;
2102 case P2PADVERT_ADDR:
2103 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2104 rrt->rrt_info.rip6_plen = 128;
2105 rrt->rrt_gw = in6addr_loopback;
2106 category = "addr";
2107 break;
2108 case P2PADVERT_DEST:
2109 rrt->rrt_info.rip6_dest = ifa->ifa_raddr;
2110 rrt->rrt_info.rip6_plen = 128;
2111 rrt->rrt_gw = ifa->ifa_addr;
2112 category = "dest";
2113 break;
2114 }
2115 if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) ||
2116 IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) {
2117 #if 0
2118 trace(1, "route: %s: skip unspec/linklocal "
2119 "(%s on %s)\n", category, ifcp->ifc_name);
2120 #endif
2121 free(rrt);
2122 continue;
2123 }
2124 if ((advert & i) == 0) {
2125 rrt->rrt_rflags |= RRTF_NOADVERTISE;
2126 noadv = ", NO-ADV";
2127 } else
2128 noadv = "";
2129 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2130 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
2131 np = &rrt->rrt_info;
2132 orrt = rtsearch(np, &prevrrt);
2133 if (!orrt) {
2134 /* Attach the route to the list */
2135 trace(1, "route: %s/%d: register route "
2136 "(%s on %s%s)\n",
2137 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2138 category, ifcp->ifc_name, noadv);
2139 rrt->rrt_next = riprt;
2140 riprt = rrt;
2141 } else if (rrt->rrt_index != orrt->rrt_index ||
2142 rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) {
2143 /* swap route */
2144 rrt->rrt_next = orrt->rrt_next;
2145 if (prevrrt)
2146 prevrrt->rrt_next = rrt;
2147 else
2148 riprt = rrt;
2149 free(orrt);
2150
2151 trace(1, "route: %s/%d: update (%s on %s%s)\n",
2152 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2153 category, ifcp->ifc_name, noadv);
2154 } else {
2155 /* Already found */
2156 if (!again) {
2157 trace(1, "route: %s/%d: "
2158 "already registered (%s on %s%s)\n",
2159 inet6_n2p(&np->rip6_dest),
2160 np->rip6_plen, category,
2161 ifcp->ifc_name, noadv);
2162 }
2163 free(rrt);
2164 }
2165 }
2166 }
2167 #undef P2PADVERT_NETWORK
2168 #undef P2PADVERT_ADDR
2169 #undef P2PADVERT_DEST
2170 #undef P2PADVERT_MAX
2171 }
2172
2173 static int
getifmtu(int ifindex)2174 getifmtu(int ifindex)
2175 {
2176 int mib[6];
2177 char *buf;
2178 size_t msize;
2179 struct if_msghdr *ifm;
2180 int mtu;
2181
2182 mib[0] = CTL_NET;
2183 mib[1] = PF_ROUTE;
2184 mib[2] = 0;
2185 mib[3] = AF_INET6;
2186 mib[4] = NET_RT_IFLIST;
2187 mib[5] = ifindex;
2188 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2189 fatal("sysctl estimate NET_RT_IFLIST");
2190 }
2191 if ((buf = malloc(msize)) == NULL) {
2192 fatal("malloc");
2193 }
2194 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2195 fatal("sysctl NET_RT_IFLIST");
2196 }
2197 ifm = (struct if_msghdr *)buf;
2198 mtu = ifm->ifm_data.ifi_mtu;
2199
2200 free(buf);
2201 return mtu;
2202 }
2203
2204 static const char *
rttypes(struct rt_msghdr * rtm)2205 rttypes(struct rt_msghdr *rtm)
2206 {
2207 #define RTTYPE(s, f) \
2208 do { \
2209 if (rtm->rtm_type == (f)) \
2210 return (s); \
2211 } while (0)
2212 RTTYPE("ADD", RTM_ADD);
2213 RTTYPE("DELETE", RTM_DELETE);
2214 RTTYPE("CHANGE", RTM_CHANGE);
2215 RTTYPE("GET", RTM_GET);
2216 RTTYPE("LOSING", RTM_LOSING);
2217 RTTYPE("REDIRECT", RTM_REDIRECT);
2218 RTTYPE("MISS", RTM_MISS);
2219 RTTYPE("LOCK", RTM_LOCK);
2220 RTTYPE("OLDADD", RTM_OLDADD);
2221 RTTYPE("OLDDEL", RTM_OLDDEL);
2222 RTTYPE("NEWADDR", RTM_NEWADDR);
2223 RTTYPE("DELADDR", RTM_DELADDR);
2224 RTTYPE("IFINFO", RTM_IFINFO);
2225 #ifdef RTM_OLDADD
2226 RTTYPE("OLDADD", RTM_OLDADD);
2227 #endif
2228 #ifdef RTM_OLDDEL
2229 RTTYPE("OLDDEL", RTM_OLDDEL);
2230 #endif
2231 #ifdef RTM_OIFINFO
2232 RTTYPE("OIFINFO", RTM_OIFINFO);
2233 #endif
2234 #ifdef RTM_IFANNOUNCE
2235 RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE);
2236 #endif
2237 #ifdef RTM_NEWMADDR
2238 RTTYPE("NEWMADDR", RTM_NEWMADDR);
2239 #endif
2240 #ifdef RTM_DELMADDR
2241 RTTYPE("DELMADDR", RTM_DELMADDR);
2242 #endif
2243 #undef RTTYPE
2244 return NULL;
2245 }
2246
2247 static const char *
rtflags(struct rt_msghdr * rtm)2248 rtflags(struct rt_msghdr *rtm)
2249 {
2250 static char buf[BUFSIZ];
2251
2252 /*
2253 * letter conflict should be okay. painful when *BSD diverges...
2254 */
2255 strlcpy(buf, "", sizeof(buf));
2256 #define RTFLAG(s, f) \
2257 do { \
2258 if (rtm->rtm_flags & (f)) \
2259 strlcat(buf, (s), sizeof(buf)); \
2260 } while (0)
2261 RTFLAG("U", RTF_UP);
2262 RTFLAG("G", RTF_GATEWAY);
2263 RTFLAG("H", RTF_HOST);
2264 RTFLAG("R", RTF_REJECT);
2265 RTFLAG("D", RTF_DYNAMIC);
2266 RTFLAG("M", RTF_MODIFIED);
2267 RTFLAG("d", RTF_DONE);
2268 #ifdef RTF_MASK
2269 RTFLAG("m", RTF_MASK);
2270 #endif
2271 RTFLAG("C", RTF_CONNECTED);
2272 #ifdef RTF_CLONED
2273 RTFLAG("c", RTF_CLONED);
2274 #endif
2275 #ifdef RTF_PRCLONING
2276 RTFLAG("c", RTF_PRCLONING);
2277 #endif
2278 #ifdef RTF_WASCLONED
2279 RTFLAG("W", RTF_WASCLONED);
2280 #endif
2281 RTFLAG("S", RTF_STATIC);
2282 RTFLAG("B", RTF_BLACKHOLE);
2283 #ifdef RTF_PROTO3
2284 RTFLAG("3", RTF_PROTO3);
2285 #endif
2286 RTFLAG("2", RTF_PROTO2);
2287 RTFLAG("1", RTF_PROTO1);
2288 #ifdef RTF_BROADCAST
2289 RTFLAG("b", RTF_BROADCAST);
2290 #endif
2291 #ifdef RTF_DEFAULT
2292 RTFLAG("d", RTF_DEFAULT);
2293 #endif
2294 #ifdef RTF_ISAROUTER
2295 RTFLAG("r", RTF_ISAROUTER);
2296 #endif
2297 #ifdef RTF_TUNNEL
2298 RTFLAG("T", RTF_TUNNEL);
2299 #endif
2300 #ifdef RTF_AUTH
2301 RTFLAG("A", RTF_AUTH);
2302 #endif
2303 #ifdef RTF_CRYPT
2304 RTFLAG("E", RTF_CRYPT);
2305 #endif
2306 #undef RTFLAG
2307 return buf;
2308 }
2309
2310 static const char *
ifflags(int flags)2311 ifflags(int flags)
2312 {
2313 static char buf[BUFSIZ];
2314
2315 strlcpy(buf, "", sizeof(buf));
2316 #define IFFLAG(s, f) \
2317 do { \
2318 if (flags & (f)) { \
2319 if (buf[0]) \
2320 strlcat(buf, ",", sizeof(buf)); \
2321 strlcat(buf, (s), sizeof(buf)); \
2322 } \
2323 } while (0)
2324 IFFLAG("UP", IFF_UP);
2325 IFFLAG("BROADCAST", IFF_BROADCAST);
2326 IFFLAG("DEBUG", IFF_DEBUG);
2327 IFFLAG("LOOPBACK", IFF_LOOPBACK);
2328 IFFLAG("POINTOPOINT", IFF_POINTOPOINT);
2329 #ifdef IFF_SMART
2330 IFFLAG("SMART", IFF_SMART);
2331 #endif
2332 IFFLAG("RUNNING", IFF_RUNNING);
2333 IFFLAG("NOARP", IFF_NOARP);
2334 IFFLAG("PROMISC", IFF_PROMISC);
2335 IFFLAG("ALLMULTI", IFF_ALLMULTI);
2336 IFFLAG("OACTIVE", IFF_OACTIVE);
2337 IFFLAG("SIMPLEX", IFF_SIMPLEX);
2338 IFFLAG("LINK0", IFF_LINK0);
2339 IFFLAG("LINK1", IFF_LINK1);
2340 IFFLAG("LINK2", IFF_LINK2);
2341 IFFLAG("MULTICAST", IFF_MULTICAST);
2342 #undef IFFLAG
2343 return buf;
2344 }
2345
2346 static void
krtread(int again)2347 krtread(int again)
2348 {
2349 int mib[6];
2350 size_t msize;
2351 char *buf = NULL, *p, *lim;
2352 struct rt_msghdr *rtm;
2353 int retry;
2354 const char *errmsg;
2355
2356 retry = 0;
2357 buf = NULL;
2358 mib[0] = CTL_NET;
2359 mib[1] = PF_ROUTE;
2360 mib[2] = 0;
2361 mib[3] = AF_INET6; /* Address family */
2362 mib[4] = NET_RT_DUMP; /* Dump the kernel routing table */
2363 mib[5] = 0; /* No flags */
2364 do {
2365 retry++;
2366 errmsg = NULL;
2367 if (buf) {
2368 free(buf);
2369 buf = NULL;
2370 }
2371 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2372 errmsg = "sysctl estimate";
2373 continue;
2374 }
2375 if ((buf = malloc(msize)) == NULL) {
2376 errmsg = "malloc";
2377 continue;
2378 }
2379 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2380 errmsg = "sysctl NET_RT_DUMP";
2381 continue;
2382 }
2383 } while (retry < 5 && errmsg != NULL);
2384 if (errmsg) {
2385 fatal("%s (with %d retries, msize=%lu)", errmsg, retry,
2386 (u_long)msize);
2387 } else if (1 < retry)
2388 syslog(LOG_INFO, "NET_RT_DUMP %d retries", retry);
2389
2390 lim = buf + msize;
2391 for (p = buf; p < lim; p += rtm->rtm_msglen) {
2392 rtm = (struct rt_msghdr *)p;
2393 rt_entry(rtm, again);
2394 }
2395 free(buf);
2396 }
2397
2398 static void
rt_entry(struct rt_msghdr * rtm,int again)2399 rt_entry(struct rt_msghdr *rtm, int again)
2400 {
2401 struct sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask;
2402 struct sockaddr_in6 *sin6_genmask, *sin6_ifp;
2403 char *rtmp, *ifname = NULL;
2404 struct riprt *rrt, *orrt;
2405 struct netinfo6 *np;
2406 int s;
2407
2408 sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0;
2409 if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags &
2410 (RTF_CONNECTED|RTF_BLACKHOLE)) {
2411 return; /* not interested in the link route */
2412 }
2413 /* do not look at cloned routes */
2414 #ifdef RTF_WASCLONED
2415 if (rtm->rtm_flags & RTF_WASCLONED)
2416 return;
2417 #endif
2418 #ifdef RTF_CLONED
2419 if (rtm->rtm_flags & RTF_CLONED)
2420 return;
2421 #endif
2422 /*
2423 * do not look at dynamic routes.
2424 * netbsd/openbsd cloned routes have UGHD.
2425 */
2426 if (rtm->rtm_flags & RTF_DYNAMIC)
2427 return;
2428 rtmp = (char *)(rtm + 1);
2429 /* Destination */
2430 if ((rtm->rtm_addrs & RTA_DST) == 0)
2431 return; /* ignore routes without destination address */
2432 sin6_dst = (struct sockaddr_in6 *)rtmp;
2433 rtmp += ROUNDUP(sin6_dst->sin6_len);
2434 if (rtm->rtm_addrs & RTA_GATEWAY) {
2435 sin6_gw = (struct sockaddr_in6 *)rtmp;
2436 rtmp += ROUNDUP(sin6_gw->sin6_len);
2437 }
2438 if (rtm->rtm_addrs & RTA_NETMASK) {
2439 sin6_mask = (struct sockaddr_in6 *)rtmp;
2440 rtmp += ROUNDUP(sin6_mask->sin6_len);
2441 }
2442 if (rtm->rtm_addrs & RTA_GENMASK) {
2443 sin6_genmask = (struct sockaddr_in6 *)rtmp;
2444 rtmp += ROUNDUP(sin6_genmask->sin6_len);
2445 }
2446 if (rtm->rtm_addrs & RTA_IFP) {
2447 sin6_ifp = (struct sockaddr_in6 *)rtmp;
2448 rtmp += ROUNDUP(sin6_ifp->sin6_len);
2449 }
2450
2451 /* Destination */
2452 if (sin6_dst->sin6_family != AF_INET6)
2453 return;
2454 if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr))
2455 return; /* Link-local */
2456 if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback))
2457 return; /* Loopback */
2458 if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr))
2459 return;
2460
2461 if ((rrt = MALLOC(struct riprt)) == NULL) {
2462 fatal("malloc: struct riprt");
2463 }
2464 memset(rrt, 0, sizeof(*rrt));
2465 np = &rrt->rrt_info;
2466 rrt->rrt_same = NULL;
2467 rrt->rrt_t = time(NULL);
2468 if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC))
2469 rrt->rrt_t = 0; /* Don't age static routes */
2470 if ((rtm->rtm_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST)
2471 rrt->rrt_t = 0; /* Don't age non-gateway host routes */
2472 np->rip6_tag = 0;
2473 np->rip6_metric = rtm->rtm_rmx.rmx_hopcount;
2474 if (np->rip6_metric < 1)
2475 np->rip6_metric = 1;
2476 rrt->rrt_flags = rtm->rtm_flags;
2477 np->rip6_dest = sin6_dst->sin6_addr;
2478
2479 /* Mask or plen */
2480 if (rtm->rtm_flags & RTF_HOST)
2481 np->rip6_plen = 128; /* Host route */
2482 else if (sin6_mask)
2483 np->rip6_plen = sin6mask2len(sin6_mask);
2484 else
2485 np->rip6_plen = 0;
2486
2487 orrt = rtsearch(np, NULL);
2488 if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) {
2489 /* Already found */
2490 if (!again) {
2491 trace(1, "route: %s/%d flags %s: already registered\n",
2492 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2493 rtflags(rtm));
2494 }
2495 free(rrt);
2496 return;
2497 }
2498 /* Gateway */
2499 if (!sin6_gw)
2500 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2501 else {
2502 if (sin6_gw->sin6_family == AF_INET6)
2503 rrt->rrt_gw = sin6_gw->sin6_addr;
2504 else if (sin6_gw->sin6_family == AF_LINK) {
2505 /* XXX in case ppp link? */
2506 rrt->rrt_gw = in6addr_loopback;
2507 } else
2508 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2509 }
2510 trace(1, "route: %s/%d flags %s",
2511 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm));
2512 trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw));
2513
2514 /* Interface */
2515 s = rtm->rtm_index;
2516 if (s < nindex2ifc && index2ifc[s])
2517 ifname = index2ifc[s]->ifc_name;
2518 else {
2519 trace(1, " not configured\n");
2520 free(rrt);
2521 return;
2522 }
2523 trace(1, " if %s sock %d", ifname, s);
2524 rrt->rrt_index = s;
2525
2526 trace(1, "\n");
2527
2528 /* Check gateway */
2529 if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) &&
2530 !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
2531 trace(0, "***** Gateway %s is not a link-local address.\n",
2532 inet6_n2p(&rrt->rrt_gw));
2533 trace(0, "***** dest(%s) if(%s) -- Not optimized.\n",
2534 inet6_n2p(&rrt->rrt_info.rip6_dest), ifname);
2535 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR;
2536 }
2537
2538 /* Put it to the route list */
2539 if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) {
2540 /* replace route list */
2541 rrt->rrt_next = orrt->rrt_next;
2542 *orrt = *rrt;
2543 trace(1, "route: %s/%d flags %s: replace new route\n",
2544 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2545 rtflags(rtm));
2546 free(rrt);
2547 } else {
2548 rrt->rrt_next = riprt;
2549 riprt = rrt;
2550 }
2551 }
2552
2553 static int
addroute(struct riprt * rrt,const struct in6_addr * gw,struct ifc * ifcp)2554 addroute(struct riprt *rrt, const struct in6_addr *gw, struct ifc *ifcp)
2555 {
2556 struct netinfo6 *np;
2557 u_char buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ];
2558 struct rt_msghdr *rtm;
2559 struct sockaddr_in6 *sin6;
2560 int len;
2561
2562 np = &rrt->rrt_info;
2563 inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1));
2564 inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2));
2565 tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n",
2566 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2567 np->rip6_metric - 1, buf2);
2568 if (rtlog)
2569 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(),
2570 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2571 np->rip6_metric - 1, buf2);
2572 if (nflag)
2573 return 0;
2574
2575 memset(buf, 0, sizeof(buf));
2576 rtm = (struct rt_msghdr *)buf;
2577 rtm->rtm_type = RTM_ADD;
2578 rtm->rtm_version = RTM_VERSION;
2579 rtm->rtm_seq = ++seq;
2580 rtm->rtm_pid = pid;
2581 rtm->rtm_flags = rrt->rrt_flags;
2582 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2583 rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1;
2584 rtm->rtm_inits = RTV_HOPCOUNT;
2585 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2586 /* Destination */
2587 sin6->sin6_len = sizeof(struct sockaddr_in6);
2588 sin6->sin6_family = AF_INET6;
2589 sin6->sin6_addr = np->rip6_dest;
2590 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2591 /* Gateway */
2592 sin6->sin6_len = sizeof(struct sockaddr_in6);
2593 sin6->sin6_family = AF_INET6;
2594 sin6->sin6_addr = *gw;
2595 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2596 /* Netmask */
2597 sin6->sin6_len = sizeof(struct sockaddr_in6);
2598 sin6->sin6_family = AF_INET6;
2599 sin6->sin6_addr = *(plen2mask(np->rip6_plen));
2600 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2601
2602 len = (char *)sin6 - (char *)buf;
2603 rtm->rtm_msglen = len;
2604 if (write(rtsock, buf, len) > 0)
2605 return 0;
2606
2607 if (errno == EEXIST) {
2608 trace(0, "ADD: Route already exists %s/%d gw %s\n",
2609 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2610 if (rtlog)
2611 fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n",
2612 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2613 } else {
2614 trace(0, "Can not write to rtsock (addroute): %s\n",
2615 strerror(errno));
2616 if (rtlog)
2617 fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2618 strerror(errno));
2619 }
2620 return -1;
2621 }
2622
2623 static int
delroute(struct netinfo6 * np,struct in6_addr * gw)2624 delroute(struct netinfo6 *np, struct in6_addr *gw)
2625 {
2626 u_char buf[BUFSIZ], buf2[BUFSIZ];
2627 struct rt_msghdr *rtm;
2628 struct sockaddr_in6 *sin6;
2629 int len;
2630
2631 inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2));
2632 tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest),
2633 np->rip6_plen, buf2);
2634 if (rtlog)
2635 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n",
2636 hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2637 if (nflag)
2638 return 0;
2639
2640 memset(buf, 0, sizeof(buf));
2641 rtm = (struct rt_msghdr *)buf;
2642 rtm->rtm_type = RTM_DELETE;
2643 rtm->rtm_version = RTM_VERSION;
2644 rtm->rtm_seq = ++seq;
2645 rtm->rtm_pid = pid;
2646 rtm->rtm_flags = RTF_UP | RTF_GATEWAY;
2647 if (np->rip6_plen == sizeof(struct in6_addr) * 8)
2648 rtm->rtm_flags |= RTF_HOST;
2649 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2650 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2651 /* Destination */
2652 sin6->sin6_len = sizeof(struct sockaddr_in6);
2653 sin6->sin6_family = AF_INET6;
2654 sin6->sin6_addr = np->rip6_dest;
2655 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2656 /* Gateway */
2657 sin6->sin6_len = sizeof(struct sockaddr_in6);
2658 sin6->sin6_family = AF_INET6;
2659 sin6->sin6_addr = *gw;
2660 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2661 /* Netmask */
2662 sin6->sin6_len = sizeof(struct sockaddr_in6);
2663 sin6->sin6_family = AF_INET6;
2664 sin6->sin6_addr = *(plen2mask(np->rip6_plen));
2665 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2666
2667 len = (char *)sin6 - (char *)buf;
2668 rtm->rtm_msglen = len;
2669 if (write(rtsock, buf, len) >= 0)
2670 return 0;
2671
2672 if (errno == ESRCH) {
2673 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n",
2674 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2675 if (rtlog)
2676 fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n",
2677 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2678 } else {
2679 trace(0, "Can not write to rtsock (delroute): %s\n",
2680 strerror(errno));
2681 if (rtlog)
2682 fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2683 strerror(errno));
2684 }
2685 return -1;
2686 }
2687
2688 static const char *
inet6_n2p(const struct in6_addr * p)2689 inet6_n2p(const struct in6_addr *p)
2690 {
2691 static char buf[BUFSIZ];
2692
2693 return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf));
2694 }
2695
2696 static void
ifrtdump(int sig)2697 ifrtdump(int sig)
2698 {
2699
2700 ifdump(sig);
2701 rtdump(sig);
2702 }
2703
2704 static void
ifdump(int sig)2705 ifdump(int sig)
2706 {
2707 struct ifc *ifcp;
2708 FILE *dump;
2709 int i;
2710
2711 if (sig == 0)
2712 dump = stderr;
2713 else
2714 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2715 dump = stderr;
2716
2717 fprintf(dump, "%s: Interface Table Dump\n", hms());
2718 fprintf(dump, " Number of interfaces: %d\n", nifc);
2719 for (i = 0; i < 2; i++) {
2720 fprintf(dump, " %sadvertising interfaces:\n", i ? "non-" : "");
2721 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
2722 if (i == 0) {
2723 if ((ifcp->ifc_flags & IFF_UP) == 0)
2724 continue;
2725 if (iff_find(ifcp, 'N') != NULL)
2726 continue;
2727 } else {
2728 if (ifcp->ifc_flags & IFF_UP)
2729 continue;
2730 }
2731 ifdump0(dump, ifcp);
2732 }
2733 }
2734 fprintf(dump, "\n");
2735 if (dump != stderr)
2736 fclose(dump);
2737 }
2738
2739 static void
ifdump0(FILE * dump,const struct ifc * ifcp)2740 ifdump0(FILE *dump, const struct ifc *ifcp)
2741 {
2742 struct ifac *ifa;
2743 struct iff *iffp;
2744 char buf[BUFSIZ];
2745 const char *ft;
2746 int addr;
2747
2748 fprintf(dump, " %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n",
2749 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags),
2750 inet6_n2p(&ifcp->ifc_mylladdr),
2751 ifcp->ifc_mtu, ifcp->ifc_metric);
2752 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2753 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
2754 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr,
2755 buf, sizeof(buf));
2756 fprintf(dump, "\t%s/%d -- %s\n",
2757 inet6_n2p(&ifa->ifa_addr),
2758 ifa->ifa_plen, buf);
2759 } else {
2760 fprintf(dump, "\t%s/%d\n",
2761 inet6_n2p(&ifa->ifa_addr),
2762 ifa->ifa_plen);
2763 }
2764 }
2765 if (ifcp->ifc_filter) {
2766 fprintf(dump, "\tFilter:");
2767 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
2768 addr = 0;
2769 switch (iffp->iff_type) {
2770 case 'A':
2771 ft = "Aggregate"; addr++; break;
2772 case 'N':
2773 ft = "No-use"; break;
2774 case 'O':
2775 ft = "Advertise-only"; addr++; break;
2776 case 'T':
2777 ft = "Default-only"; break;
2778 case 'L':
2779 ft = "Listen-only"; addr++; break;
2780 default:
2781 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type);
2782 ft = buf;
2783 addr++;
2784 break;
2785 }
2786 fprintf(dump, " %s", ft);
2787 if (addr) {
2788 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr),
2789 iffp->iff_plen);
2790 }
2791 }
2792 fprintf(dump, "\n");
2793 }
2794 }
2795
2796 static void
rtdump(int sig)2797 rtdump(int sig)
2798 {
2799 struct riprt *rrt;
2800 char buf[BUFSIZ];
2801 FILE *dump;
2802 time_t t, age;
2803
2804 if (sig == 0)
2805 dump = stderr;
2806 else
2807 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2808 dump = stderr;
2809
2810 t = time(NULL);
2811 fprintf(dump, "\n%s: Routing Table Dump\n", hms());
2812 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
2813 if (rrt->rrt_t == 0)
2814 age = 0;
2815 else
2816 age = t - rrt->rrt_t;
2817 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest,
2818 buf, sizeof(buf));
2819 fprintf(dump, " %s/%d if(%d:%s) gw(%s) [%d] age(%ld)",
2820 buf, rrt->rrt_info.rip6_plen, rrt->rrt_index,
2821 index2ifc[rrt->rrt_index]->ifc_name,
2822 inet6_n2p(&rrt->rrt_gw),
2823 rrt->rrt_info.rip6_metric, (long)age);
2824 if (rrt->rrt_info.rip6_tag) {
2825 fprintf(dump, " tag(0x%04x)",
2826 ntohs(rrt->rrt_info.rip6_tag) & 0xffff);
2827 }
2828 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)
2829 fprintf(dump, " NOT-LL");
2830 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
2831 fprintf(dump, " NO-ADV");
2832 fprintf(dump, "\n");
2833 }
2834 fprintf(dump, "\n");
2835 if (dump != stderr)
2836 fclose(dump);
2837 }
2838
2839 /*
2840 * Parse the -A (and -O) options and put corresponding filter object to the
2841 * specified interface structures. Each of the -A/O option has the following
2842 * syntax: -A 5f09:c400::/32,ef0,ef1 (aggregate)
2843 * -O 5f09:c400::/32,ef0,ef1 (only when match)
2844 */
2845 static void
filterconfig(void)2846 filterconfig(void)
2847 {
2848 int i;
2849 char *p, *ap, *iflp, *ifname, *ep;
2850 struct iff ftmp, *iff_obj;
2851 struct ifc *ifcp;
2852 struct riprt *rrt;
2853 #if 0
2854 struct in6_addr gw;
2855 #endif
2856 u_long plen;
2857
2858 for (i = 0; i < nfilter; i++) {
2859 ap = filter[i];
2860 iflp = NULL;
2861 ifcp = NULL;
2862 if (filtertype[i] == 'N' || filtertype[i] == 'T') {
2863 iflp = ap;
2864 goto ifonly;
2865 }
2866 if ((p = strchr(ap, ',')) != NULL) {
2867 *p++ = '\0';
2868 iflp = p;
2869 }
2870 if ((p = strchr(ap, '/')) == NULL) {
2871 fatal("no prefixlen specified for '%s'", ap);
2872 }
2873 *p++ = '\0';
2874 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) {
2875 fatal("invalid prefix specified for '%s'", ap);
2876 }
2877 errno = 0;
2878 ep = NULL;
2879 plen = strtoul(p, &ep, 10);
2880 if (errno || !*p || *ep || plen > sizeof(ftmp.iff_addr) * 8) {
2881 fatal("invalid prefix length specified for '%s'", ap);
2882 }
2883 ftmp.iff_plen = plen;
2884 ftmp.iff_next = NULL;
2885 applyplen(&ftmp.iff_addr, ftmp.iff_plen);
2886 ifonly:
2887 ftmp.iff_type = filtertype[i];
2888 if (iflp == NULL || *iflp == '\0') {
2889 fatal("no interface specified for '%s'", ap);
2890 }
2891 /* parse the interface listing portion */
2892 while (iflp) {
2893 ifname = iflp;
2894 if ((iflp = strchr(iflp, ',')) != NULL)
2895 *iflp++ = '\0';
2896 ifcp = ifc_find(ifname);
2897 if (ifcp == NULL) {
2898 fatal("no interface %s exists", ifname);
2899 }
2900 iff_obj = malloc(sizeof(struct iff));
2901 if (iff_obj == NULL) {
2902 fatal("malloc of iff_obj");
2903 }
2904 memcpy((void *)iff_obj, (void *)&ftmp,
2905 sizeof(struct iff));
2906 /* link it to the interface filter */
2907 iff_obj->iff_next = ifcp->ifc_filter;
2908 ifcp->ifc_filter = iff_obj;
2909 }
2910
2911 /*
2912 * -A: aggregate configuration.
2913 */
2914 if (filtertype[i] != 'A')
2915 continue;
2916 /* put the aggregate to the kernel routing table */
2917 rrt = malloc(sizeof(struct riprt));
2918 if (rrt == NULL) {
2919 fatal("malloc: rrt");
2920 }
2921 memset(rrt, 0, sizeof(struct riprt));
2922 rrt->rrt_info.rip6_dest = ftmp.iff_addr;
2923 rrt->rrt_info.rip6_plen = ftmp.iff_plen;
2924 rrt->rrt_info.rip6_metric = 1;
2925 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2926 rrt->rrt_gw = in6addr_loopback;
2927 rrt->rrt_flags = RTF_UP | RTF_REJECT;
2928 rrt->rrt_rflags = RRTF_AGGREGATE;
2929 rrt->rrt_t = 0;
2930 rrt->rrt_index = loopifcp->ifc_index;
2931 #if 0
2932 if (getroute(&rrt->rrt_info, &gw)) {
2933 #if 0
2934 /*
2935 * When the address has already been registered in the
2936 * kernel routing table, it should be removed
2937 */
2938 delroute(&rrt->rrt_info, &gw);
2939 #else
2940 /* it is safer behavior */
2941 errno = EINVAL;
2942 fatal("%s/%u already in routing table, "
2943 "cannot aggregate",
2944 inet6_n2p(&rrt->rrt_info.rip6_dest),
2945 rrt->rrt_info.rip6_plen);
2946 #endif
2947 }
2948 #endif
2949 /* Put the route to the list */
2950 rrt->rrt_next = riprt;
2951 riprt = rrt;
2952 trace(1, "Aggregate: %s/%d for %s\n",
2953 inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen,
2954 ifcp->ifc_name);
2955 /* Add this route to the kernel */
2956 if (nflag) /* do not modify kernel routing table */
2957 continue;
2958 addroute(rrt, &in6addr_loopback, loopifcp);
2959 }
2960 }
2961
2962 /***************** utility functions *****************/
2963
2964 /*
2965 * Returns a pointer to ifac whose address and prefix length matches
2966 * with the address and prefix length specified in the arguments.
2967 */
2968 static struct ifac *
ifa_match(const struct ifc * ifcp,const struct in6_addr * ia,int plen)2969 ifa_match(const struct ifc *ifcp, const struct in6_addr *ia, int plen)
2970 {
2971 struct ifac *ifa;
2972
2973 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2974 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) &&
2975 ifa->ifa_plen == plen)
2976 break;
2977 }
2978 return ifa;
2979 }
2980
2981 /*
2982 * Return a pointer to riprt structure whose address and prefix length
2983 * matches with the address and prefix length found in the argument.
2984 * Note: This is not a rtalloc(). Therefore exact match is necessary.
2985 */
2986 static struct riprt *
rtsearch(struct netinfo6 * np,struct riprt ** prev_rrt)2987 rtsearch(struct netinfo6 *np, struct riprt **prev_rrt)
2988 {
2989 struct riprt *rrt;
2990
2991 if (prev_rrt)
2992 *prev_rrt = NULL;
2993 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
2994 if (rrt->rrt_info.rip6_plen == np->rip6_plen &&
2995 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
2996 &np->rip6_dest))
2997 return rrt;
2998 if (prev_rrt)
2999 *prev_rrt = rrt;
3000 }
3001 if (prev_rrt)
3002 *prev_rrt = NULL;
3003 return 0;
3004 }
3005
3006 static int
sin6mask2len(const struct sockaddr_in6 * sin6)3007 sin6mask2len(const struct sockaddr_in6 *sin6)
3008 {
3009
3010 return mask2len(&sin6->sin6_addr,
3011 sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr));
3012 }
3013
3014 static int
mask2len(const struct in6_addr * addr,int lenlim)3015 mask2len(const struct in6_addr *addr, int lenlim)
3016 {
3017 int i = 0, j;
3018 const u_char *p = (const u_char *)addr;
3019
3020 for (j = 0; j < lenlim; j++, p++) {
3021 if (*p != 0xff)
3022 break;
3023 i += 8;
3024 }
3025 if (j < lenlim) {
3026 switch (*p) {
3027 #define MASKLEN(m, l) case m: do { i += l; break; } while (0)
3028 MASKLEN(0xfe, 7); break;
3029 MASKLEN(0xfc, 6); break;
3030 MASKLEN(0xf8, 5); break;
3031 MASKLEN(0xf0, 4); break;
3032 MASKLEN(0xe0, 3); break;
3033 MASKLEN(0xc0, 2); break;
3034 MASKLEN(0x80, 1); break;
3035 #undef MASKLEN
3036 }
3037 }
3038 return i;
3039 }
3040
3041 static const u_char plent[8] = {
3042 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
3043 };
3044
3045 static void
applyplen(struct in6_addr * ia,int plen)3046 applyplen(struct in6_addr *ia, int plen)
3047 {
3048 u_char *p;
3049 int i;
3050
3051 p = ia->s6_addr;
3052 for (i = 0; i < 16; i++) {
3053 if (plen <= 0)
3054 *p = 0;
3055 else if (plen < 8)
3056 *p &= plent[plen];
3057 p++, plen -= 8;
3058 }
3059 }
3060
3061 static const int pl2m[9] = {
3062 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
3063 };
3064
3065 static struct in6_addr *
plen2mask(int n)3066 plen2mask(int n)
3067 {
3068 static struct in6_addr ia;
3069 u_char *p;
3070 int i;
3071
3072 memset(&ia, 0, sizeof(struct in6_addr));
3073 p = (u_char *)&ia;
3074 for (i = 0; i < 16; i++, p++, n -= 8) {
3075 if (n >= 8) {
3076 *p = 0xff;
3077 continue;
3078 }
3079 *p = pl2m[n];
3080 break;
3081 }
3082 return &ia;
3083 }
3084
3085 static char *
xstrdup(char * p)3086 xstrdup(char *p)
3087 {
3088 char *buf = strdup(p);
3089 if (buf == NULL) {
3090 fatal("strdup");
3091 }
3092 return buf;
3093 }
3094
3095 static char *
hms(void)3096 hms(void)
3097 {
3098 static char buf[BUFSIZ];
3099 time_t t;
3100 struct tm *tm;
3101
3102 t = time(NULL);
3103 if ((tm = localtime(&t)) == 0) {
3104 fatal("localtime");
3105 }
3106 snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min,
3107 tm->tm_sec);
3108 return buf;
3109 }
3110
3111 #define RIPRANDDEV 1.0 /* 30 +- 15, max - min = 30 */
3112
3113 static int
ripinterval(int timer)3114 ripinterval(int timer)
3115 {
3116 double r = rand();
3117
3118 interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5));
3119 nextalarm = time(NULL) + interval;
3120 return interval;
3121 }
3122
3123 static void
fatal(const char * fmt,...)3124 fatal(const char *fmt, ...)
3125 {
3126 va_list ap;
3127 char buf[1024];
3128
3129 va_start(ap, fmt);
3130 vsnprintf(buf, sizeof(buf), fmt, ap);
3131 va_end(ap);
3132 perror(buf);
3133 if (errno)
3134 syslog(LOG_ERR, "%s: %s", buf, strerror(errno));
3135 else
3136 syslog(LOG_ERR, "%s", buf);
3137 rtdexit();
3138 }
3139
3140 static void
tracet(int level,const char * fmt,...)3141 tracet(int level, const char *fmt, ...)
3142 {
3143 va_list ap;
3144
3145 if (level <= dflag) {
3146 va_start(ap, fmt);
3147 fprintf(stderr, "%s: ", hms());
3148 vfprintf(stderr, fmt, ap);
3149 va_end(ap);
3150 }
3151 if (dflag) {
3152 va_start(ap, fmt);
3153 if (level > 0)
3154 vsyslog(LOG_DEBUG, fmt, ap);
3155 else
3156 vsyslog(LOG_WARNING, fmt, ap);
3157 va_end(ap);
3158 }
3159 }
3160
3161 static void
trace(int level,const char * fmt,...)3162 trace(int level, const char *fmt, ...)
3163 {
3164 va_list ap;
3165
3166 if (level <= dflag) {
3167 va_start(ap, fmt);
3168 vfprintf(stderr, fmt, ap);
3169 va_end(ap);
3170 }
3171 if (dflag) {
3172 va_start(ap, fmt);
3173 if (level > 0)
3174 vsyslog(LOG_DEBUG, fmt, ap);
3175 else
3176 vsyslog(LOG_WARNING, fmt, ap);
3177 va_end(ap);
3178 }
3179 }
3180
3181 static struct ifc *
ifc_find(char * name)3182 ifc_find(char *name)
3183 {
3184 struct ifc *ifcp;
3185
3186 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
3187 if (strcmp(name, ifcp->ifc_name) == 0)
3188 return ifcp;
3189 }
3190 return NULL;
3191 }
3192
3193 static struct iff *
iff_find(struct ifc * ifcp,int type)3194 iff_find(struct ifc *ifcp, int type)
3195 {
3196 struct iff *iffp;
3197
3198 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
3199 if (iffp->iff_type == type)
3200 return iffp;
3201 }
3202 return NULL;
3203 }
3204
3205 static void
setindex2ifc(int idx,struct ifc * ifcp)3206 setindex2ifc(int idx, struct ifc *ifcp)
3207 {
3208 int n, nsize;
3209 struct ifc **p;
3210
3211 if (!index2ifc) {
3212 nindex2ifc = 5; /*initial guess*/
3213 index2ifc = malloc(sizeof(*index2ifc) * nindex2ifc);
3214 if (index2ifc == NULL) {
3215 fatal("malloc");
3216 }
3217 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc);
3218 }
3219 n = nindex2ifc;
3220 for (nsize = nindex2ifc; nsize <= idx; nsize *= 2)
3221 ;
3222 if (n != nsize) {
3223 p = (struct ifc **)realloc(index2ifc,
3224 sizeof(*index2ifc) * nsize);
3225 if (p == NULL) {
3226 fatal("realloc");
3227 }
3228 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n));
3229 index2ifc = p;
3230 nindex2ifc = nsize;
3231 }
3232 index2ifc[idx] = ifcp;
3233 }
3234