1/* $KAME: route6d.c,v 1.104 2003/10/31 00:30:20 itojun Exp $ */ 2 3/*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 35#include <sys/param.h> 36#include <sys/file.h> 37#include <sys/ioctl.h> 38#include <sys/queue.h> 39#include <sys/socket.h> 40#include <sys/sysctl.h> 41#include <sys/uio.h> 42#include <arpa/inet.h> 43#include <net/if.h> 44#include <net/route.h> 45#include <netinet/in.h> 46#include <netinet/in_var.h> 47#include <netinet/ip6.h> 48#include <netinet/udp.h> 49#include <err.h> 50#include <errno.h> 51#include <fnmatch.h> 52#include <ifaddrs.h> 53#include <netdb.h> 54#ifdef HAVE_POLL_H 55#include <poll.h> 56#endif 57#include <signal.h> 58#include <stdio.h> 59#include <stdarg.h> 60#include <stddef.h> 61#include <stdlib.h> 62#include <string.h> 63#include <syslog.h> 64#include <time.h> 65#include <unistd.h> 66 67#include "route6d.h" 68 69#define MAXFILTER 40 70#define RT_DUMP_MAXRETRY 15 71 72#ifdef DEBUG 73#define INIT_INTERVAL6 6 74#else 75#define INIT_INTERVAL6 10 /* Wait to submit an initial riprequest */ 76#endif 77 78/* alignment constraint for routing socket */ 79#define ROUNDUP(a) \ 80 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 81#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 82 83struct ifc { /* Configuration of an interface */ 84 TAILQ_ENTRY(ifc) ifc_next; 85 86 char ifc_name[IFNAMSIZ]; /* if name */ 87 int ifc_index; /* if index */ 88 int ifc_mtu; /* if mtu */ 89 int ifc_metric; /* if metric */ 90 u_int ifc_flags; /* flags */ 91 short ifc_cflags; /* IFC_XXX */ 92 struct in6_addr ifc_mylladdr; /* my link-local address */ 93 struct sockaddr_in6 ifc_ripsin; /* rip multicast address */ 94 TAILQ_HEAD(, ifac) ifc_ifac_head; /* list of AF_INET6 addrs */ 95 TAILQ_HEAD(, iff) ifc_iff_head; /* list of filters */ 96 int ifc_joined; /* joined to ff02::9 */ 97}; 98static TAILQ_HEAD(, ifc) ifc_head = TAILQ_HEAD_INITIALIZER(ifc_head); 99 100struct ifac { /* Address associated to an interface */ 101 TAILQ_ENTRY(ifac) ifac_next; 102 103 struct ifc *ifac_ifc; /* back pointer */ 104 struct in6_addr ifac_addr; /* address */ 105 struct in6_addr ifac_raddr; /* remote address, valid in p2p */ 106 int ifac_scope_id; /* scope id */ 107 int ifac_plen; /* prefix length */ 108}; 109 110struct iff { /* Filters for an interface */ 111 TAILQ_ENTRY(iff) iff_next; 112 113 int iff_type; 114 struct in6_addr iff_addr; 115 int iff_plen; 116}; 117 118static struct ifc **index2ifc; 119static unsigned int nindex2ifc; 120static struct ifc *loopifcp = NULL; /* pointing to loopback */ 121#ifdef HAVE_POLL_H 122static struct pollfd set[2]; 123#else 124static fd_set *sockvecp; /* vector to select() for receiving */ 125static fd_set *recvecp; 126static int fdmasks; 127static int maxfd; /* maximum fd for select() */ 128#endif 129static int rtsock; /* the routing socket */ 130static int ripsock; /* socket to send/receive RIP datagram */ 131 132static struct rip6 *ripbuf; /* packet buffer for sending */ 133 134/* 135 * Maintain the routes in a linked list. When the number of the routes 136 * grows, somebody would like to introduce a hash based or a radix tree 137 * based structure. I believe the number of routes handled by RIP is 138 * limited and I don't have to manage a complex data structure, however. 139 * 140 * One of the major drawbacks of the linear linked list is the difficulty 141 * of representing the relationship between a couple of routes. This may 142 * be a significant problem when we have to support route aggregation with 143 * suppressing the specifics covered by the aggregate. 144 */ 145 146struct riprt { 147 TAILQ_ENTRY(riprt) rrt_next; /* next destination */ 148 149 struct riprt *rrt_same; /* same destination - future use */ 150 struct netinfo6 rrt_info; /* network info */ 151 struct in6_addr rrt_gw; /* gateway */ 152 u_long rrt_flags; /* kernel routing table flags */ 153 u_long rrt_rflags; /* route6d routing table flags */ 154 time_t rrt_t; /* when the route validated */ 155 int rrt_index; /* ifindex from which this route got */ 156}; 157static TAILQ_HEAD(, riprt) riprt_head = TAILQ_HEAD_INITIALIZER(riprt_head); 158 159static int dflag = 0; /* debug flag */ 160static int qflag = 0; /* quiet flag */ 161static int nflag = 0; /* don't update kernel routing table */ 162static int aflag = 0; /* age out even the statically defined routes */ 163static int hflag = 0; /* don't split horizon */ 164static int lflag = 0; /* exchange site local routes */ 165static int Pflag = 0; /* don't age out routes with RTF_PROTO[123] */ 166static int Qflag = RTF_PROTO2; /* set RTF_PROTO[123] flag to routes by RIPng */ 167static int sflag = 0; /* announce static routes w/ split horizon */ 168static int Sflag = 0; /* announce static routes to every interface */ 169static unsigned long routetag = 0; /* route tag attached on originating case */ 170 171static char *filter[MAXFILTER]; 172static int filtertype[MAXFILTER]; 173static int nfilter = 0; 174 175static pid_t pid; 176 177static struct sockaddr_storage ripsin; 178 179static int interval = 1; 180static time_t nextalarm = 0; 181#if 0 182static time_t sup_trig_update = 0; 183#endif 184 185static FILE *rtlog = NULL; 186 187static int logopened = 0; 188 189static int seq = 0; 190 191static volatile sig_atomic_t seenalrm; 192static volatile sig_atomic_t seenquit; 193static volatile sig_atomic_t seenusr1; 194 195#define RRTF_AGGREGATE 0x08000000 196#define RRTF_NOADVERTISE 0x10000000 197#define RRTF_NH_NOT_LLADDR 0x20000000 198#define RRTF_SENDANYWAY 0x40000000 199#define RRTF_CHANGED 0x80000000 200 201static void sighandler(int); 202static void ripalarm(void); 203static void riprecv(void); 204static void ripsend(struct ifc *, struct sockaddr_in6 *, int); 205static int out_filter(struct riprt *, struct ifc *); 206static void init(void); 207static void ifconfig(void); 208static int ifconfig1(const char *, const struct sockaddr *, struct ifc *, int); 209static void rtrecv(void); 210static int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *, 211 const struct sockaddr_in6 *); 212static int rt_deladdr(struct ifc *, const struct sockaddr_in6 *, 213 const struct sockaddr_in6 *); 214static void filterconfig(void); 215static int getifmtu(int); 216static const char *rttypes(struct rt_msghdr *); 217static const char *rtflags(struct rt_msghdr *); 218static const char *ifflags(int); 219static int ifrt(struct ifc *, int); 220static void ifrt_p2p(struct ifc *, int); 221static void applyplen(struct in6_addr *, int); 222static void ifrtdump(int); 223static void ifdump(int); 224static void ifdump0(FILE *, const struct ifc *); 225static void ifremove(int); 226static void rtdump(int); 227static void rt_entry(struct rt_msghdr *, int); 228static void rtdexit(void); 229static void riprequest(struct ifc *, struct netinfo6 *, int, 230 struct sockaddr_in6 *); 231static void ripflush(struct ifc *, struct sockaddr_in6 *, int, struct netinfo6 *np); 232static void sendrequest(struct ifc *); 233static int sin6mask2len(const struct sockaddr_in6 *); 234static int mask2len(const struct in6_addr *, int); 235static int sendpacket(struct sockaddr_in6 *, int); 236static int addroute(struct riprt *, const struct in6_addr *, struct ifc *); 237static int delroute(struct netinfo6 *, struct in6_addr *); 238#if 0 239static struct in6_addr *getroute(struct netinfo6 *, struct in6_addr *); 240#endif 241static void krtread(int); 242static int tobeadv(struct riprt *, struct ifc *); 243static char *allocopy(char *); 244static char *hms(void); 245static const char *inet6_n2p(const struct in6_addr *); 246static struct ifac *ifa_match(const struct ifc *, const struct in6_addr *, int); 247static struct in6_addr *plen2mask(int); 248static struct riprt *rtsearch(struct netinfo6 *); 249static int ripinterval(int); 250#if 0 251static time_t ripsuptrig(void); 252#endif 253static void fatal(const char *, ...) 254 __attribute__((__format__(__printf__, 1, 2))); 255static void trace(int, const char *, ...) 256 __attribute__((__format__(__printf__, 2, 3))); 257static void tracet(int, const char *, ...) 258 __attribute__((__format__(__printf__, 2, 3))); 259static struct ifc *ifc_find(char *); 260static struct iff *iff_find(struct ifc *, int); 261static void setindex2ifc(int, struct ifc *); 262 263#define MALLOC(type) ((type *)malloc(sizeof(type))) 264 265#define IFIL_TYPE_ANY 0x0 266#define IFIL_TYPE_A 'A' 267#define IFIL_TYPE_N 'N' 268#define IFIL_TYPE_T 'T' 269#define IFIL_TYPE_O 'O' 270#define IFIL_TYPE_L 'L' 271 272int 273main(int argc, char *argv[]) 274{ 275 int ch; 276 int error = 0; 277 unsigned long proto; 278 struct ifc *ifcp; 279 sigset_t mask, omask; 280 const char *pidfile = ROUTE6D_PID; 281 FILE *pidfh; 282 char *progname; 283 char *ep; 284 285 progname = strrchr(*argv, '/'); 286 if (progname) 287 progname++; 288 else 289 progname = *argv; 290 291 pid = getpid(); 292 while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnp:P:Q:qsS")) != -1) { 293 switch (ch) { 294 case 'A': 295 case 'N': 296 case 'O': 297 case 'T': 298 case 'L': 299 if (nfilter >= MAXFILTER) { 300 fatal("Exceeds MAXFILTER"); 301 /*NOTREACHED*/ 302 } 303 filtertype[nfilter] = ch; 304 filter[nfilter++] = allocopy(optarg); 305 break; 306 case 't': 307 ep = NULL; 308 routetag = strtoul(optarg, &ep, 0); 309 if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) { 310 fatal("invalid route tag"); 311 /*NOTREACHED*/ 312 } 313 break; 314 case 'p': 315 pidfile = optarg; 316 break; 317 case 'P': 318 ep = NULL; 319 proto = strtoul(optarg, &ep, 0); 320 if (!ep || *ep != '\0' || 3 < proto) { 321 fatal("invalid P flag"); 322 /*NOTREACHED*/ 323 } 324 if (proto == 0) 325 Pflag = 0; 326 if (proto == 1) 327 Pflag |= RTF_PROTO1; 328 if (proto == 2) 329 Pflag |= RTF_PROTO2; 330 if (proto == 3) 331 Pflag |= RTF_PROTO3; 332 break; 333 case 'Q': 334 ep = NULL; 335 proto = strtoul(optarg, &ep, 0); 336 if (!ep || *ep != '\0' || 3 < proto) { 337 fatal("invalid Q flag"); 338 /*NOTREACHED*/ 339 } 340 if (proto == 0) 341 Qflag = 0; 342 if (proto == 1) 343 Qflag |= RTF_PROTO1; 344 if (proto == 2) 345 Qflag |= RTF_PROTO2; 346 if (proto == 3) 347 Qflag |= RTF_PROTO3; 348 break; 349 case 'R': 350 if ((rtlog = fopen(optarg, "w")) == NULL) { 351 fatal("Can not write to routelog"); 352 /*NOTREACHED*/ 353 } 354 break; 355#define FLAG(c, flag, n) case c: do { flag = n; break; } while(0) 356 FLAG('a', aflag, 1); break; 357 FLAG('d', dflag, 1); break; 358 FLAG('D', dflag, 2); break; 359 FLAG('h', hflag, 1); break; 360 FLAG('l', lflag, 1); break; 361 FLAG('n', nflag, 1); break; 362 FLAG('q', qflag, 1); break; 363 FLAG('s', sflag, 1); break; 364 FLAG('S', Sflag, 1); break; 365#undef FLAG 366 default: 367 fatal("Invalid option specified, terminating"); 368 /*NOTREACHED*/ 369 } 370 } 371 argc -= optind; 372 argv += optind; 373 if (argc > 0) { 374 fatal("bogus extra arguments"); 375 /*NOTREACHED*/ 376 } 377 378 if (geteuid()) { 379 nflag = 1; 380 fprintf(stderr, "No kernel update is allowed\n"); 381 } 382 383 if (dflag == 0) { 384 if (daemon(0, 0) < 0) { 385 fatal("daemon"); 386 /*NOTREACHED*/ 387 } 388 } 389 390 openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON); 391 logopened++; 392 393 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) 394 fatal("malloc"); 395 memset(ripbuf, 0, RIP6_MAXMTU); 396 ripbuf->rip6_cmd = RIP6_RESPONSE; 397 ripbuf->rip6_vers = RIP6_VERSION; 398 ripbuf->rip6_res1[0] = 0; 399 ripbuf->rip6_res1[1] = 0; 400 401 init(); 402 ifconfig(); 403 TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) { 404 if (ifcp->ifc_index < 0) { 405 fprintf(stderr, "No ifindex found at %s " 406 "(no link-local address?)\n", ifcp->ifc_name); 407 error++; 408 } 409 } 410 if (error) 411 exit(1); 412 if (loopifcp == NULL) { 413 fatal("No loopback found"); 414 /*NOTREACHED*/ 415 } 416 TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) { 417 ifrt(ifcp, 0); 418 } 419 filterconfig(); 420 krtread(0); 421 if (dflag) 422 ifrtdump(0); 423 424 pid = getpid(); 425 if ((pidfh = fopen(pidfile, "w")) != NULL) { 426 fprintf(pidfh, "%d\n", pid); 427 fclose(pidfh); 428 } 429 430 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) { 431 fatal("malloc"); 432 /*NOTREACHED*/ 433 } 434 memset(ripbuf, 0, RIP6_MAXMTU); 435 ripbuf->rip6_cmd = RIP6_RESPONSE; 436 ripbuf->rip6_vers = RIP6_VERSION; 437 ripbuf->rip6_res1[0] = 0; 438 ripbuf->rip6_res1[1] = 0; 439 440 if (signal(SIGALRM, sighandler) == SIG_ERR || 441 signal(SIGQUIT, sighandler) == SIG_ERR || 442 signal(SIGTERM, sighandler) == SIG_ERR || 443 signal(SIGUSR1, sighandler) == SIG_ERR || 444 signal(SIGHUP, sighandler) == SIG_ERR || 445 signal(SIGINT, sighandler) == SIG_ERR) { 446 fatal("signal"); 447 /*NOTREACHED*/ 448 } 449 /* 450 * To avoid rip packet congestion (not on a cable but in this 451 * process), wait for a moment to send the first RIP6_RESPONSE 452 * packets. 453 */ 454 alarm(ripinterval(INIT_INTERVAL6)); 455 456 TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) { 457 if (iff_find(ifcp, IFIL_TYPE_N) != NULL) 458 continue; 459 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 460 sendrequest(ifcp); 461 } 462 463 syslog(LOG_INFO, "**** Started ****"); 464 sigemptyset(&mask); 465 sigaddset(&mask, SIGALRM); 466 while (1) { 467 if (seenalrm) { 468 ripalarm(); 469 seenalrm = 0; 470 continue; 471 } 472 if (seenquit) { 473 rtdexit(); 474 seenquit = 0; 475 continue; 476 } 477 if (seenusr1) { 478 ifrtdump(SIGUSR1); 479 seenusr1 = 0; 480 continue; 481 } 482 483#ifdef HAVE_POLL_H 484 switch (poll(set, 2, INFTIM)) 485#else 486 memcpy(recvecp, sockvecp, fdmasks); 487 switch (select(maxfd + 1, recvecp, 0, 0, 0)) 488#endif 489 { 490 case -1: 491 if (errno != EINTR) { 492 fatal("select"); 493 /*NOTREACHED*/ 494 } 495 continue; 496 case 0: 497 continue; 498 default: 499#ifdef HAVE_POLL_H 500 if (set[0].revents & POLLIN) 501#else 502 if (FD_ISSET(ripsock, recvecp)) 503#endif 504 { 505 sigprocmask(SIG_BLOCK, &mask, &omask); 506 riprecv(); 507 sigprocmask(SIG_SETMASK, &omask, NULL); 508 } 509#ifdef HAVE_POLL_H 510 if (set[1].revents & POLLIN) 511#else 512 if (FD_ISSET(rtsock, recvecp)) 513#endif 514 { 515 sigprocmask(SIG_BLOCK, &mask, &omask); 516 rtrecv(); 517 sigprocmask(SIG_SETMASK, &omask, NULL); 518 } 519 } 520 } 521} 522 523static void 524sighandler(int signo) 525{ 526 527 switch (signo) { 528 case SIGALRM: 529 seenalrm++; 530 break; 531 case SIGQUIT: 532 case SIGTERM: 533 seenquit++; 534 break; 535 case SIGUSR1: 536 case SIGHUP: 537 case SIGINT: 538 seenusr1++; 539 break; 540 } 541} 542 543/* 544 * gracefully exits after resetting sockopts. 545 */ 546/* ARGSUSED */ 547static void 548rtdexit(void) 549{ 550 struct riprt *rrt; 551 552 alarm(0); 553 TAILQ_FOREACH(rrt, &riprt_head, rrt_next) { 554 if (rrt->rrt_rflags & RRTF_AGGREGATE) { 555 delroute(&rrt->rrt_info, &rrt->rrt_gw); 556 } 557 } 558 close(ripsock); 559 close(rtsock); 560 syslog(LOG_INFO, "**** Terminated ****"); 561 closelog(); 562 exit(1); 563} 564 565/* 566 * Called periodically: 567 * 1. age out the learned route. remove it if necessary. 568 * 2. submit RIP6_RESPONSE packets. 569 * Invoked in every SUPPLY_INTERVAL6 (30) seconds. I believe we don't have 570 * to invoke this function in every 1 or 5 or 10 seconds only to age the 571 * routes more precisely. 572 */ 573/* ARGSUSED */ 574static void 575ripalarm(void) 576{ 577 struct ifc *ifcp; 578 struct riprt *rrt, *rrt_tmp; 579 time_t t_lifetime, t_holddown; 580 581 /* age the RIP routes */ 582 t_lifetime = time(NULL) - RIP_LIFETIME; 583 t_holddown = t_lifetime - RIP_HOLDDOWN; 584 TAILQ_FOREACH_SAFE(rrt, &riprt_head, rrt_next, rrt_tmp) { 585 if (rrt->rrt_t == 0) 586 continue; 587 else if (rrt->rrt_t < t_holddown) { 588 TAILQ_REMOVE(&riprt_head, rrt, rrt_next); 589 delroute(&rrt->rrt_info, &rrt->rrt_gw); 590 free(rrt); 591 } else if (rrt->rrt_t < t_lifetime) 592 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 593 } 594 /* Supply updates */ 595 TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) { 596 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 597 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 598 } 599 alarm(ripinterval(SUPPLY_INTERVAL6)); 600} 601 602static void 603init(void) 604{ 605 int error; 606 const int int0 = 0, int1 = 1, int255 = 255; 607 struct addrinfo hints, *res; 608 char port[NI_MAXSERV]; 609 610 TAILQ_INIT(&ifc_head); 611 nindex2ifc = 0; /*initial guess*/ 612 index2ifc = NULL; 613 snprintf(port, sizeof(port), "%u", RIP6_PORT); 614 615 memset(&hints, 0, sizeof(hints)); 616 hints.ai_family = PF_INET6; 617 hints.ai_socktype = SOCK_DGRAM; 618 hints.ai_protocol = IPPROTO_UDP; 619 hints.ai_flags = AI_PASSIVE; 620 error = getaddrinfo(NULL, port, &hints, &res); 621 if (error) { 622 fatal("%s", gai_strerror(error)); 623 /*NOTREACHED*/ 624 } 625 if (res->ai_next) { 626 fatal(":: resolved to multiple address"); 627 /*NOTREACHED*/ 628 } 629 630 ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 631 if (ripsock < 0) { 632 fatal("rip socket"); 633 /*NOTREACHED*/ 634 } 635#ifdef IPV6_V6ONLY 636 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_V6ONLY, 637 &int1, sizeof(int1)) < 0) { 638 fatal("rip IPV6_V6ONLY"); 639 /*NOTREACHED*/ 640 } 641#endif 642 if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) { 643 fatal("rip bind"); 644 /*NOTREACHED*/ 645 } 646 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 647 &int255, sizeof(int255)) < 0) { 648 fatal("rip IPV6_MULTICAST_HOPS"); 649 /*NOTREACHED*/ 650 } 651 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, 652 &int0, sizeof(int0)) < 0) { 653 fatal("rip IPV6_MULTICAST_LOOP"); 654 /*NOTREACHED*/ 655 } 656 657#ifdef IPV6_RECVPKTINFO 658 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, 659 &int1, sizeof(int1)) < 0) { 660 fatal("rip IPV6_RECVPKTINFO"); 661 /*NOTREACHED*/ 662 } 663#else /* old adv. API */ 664 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, 665 &int1, sizeof(int1)) < 0) { 666 fatal("rip IPV6_PKTINFO"); 667 /*NOTREACHED*/ 668 } 669#endif 670 671#ifdef IPV6_RECVPKTINFO 672 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, 673 &int1, sizeof(int1)) < 0) { 674 fatal("rip IPV6_RECVHOPLIMIT"); 675 /*NOTREACHED*/ 676 } 677#else /* old adv. API */ 678 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_HOPLIMIT, 679 &int1, sizeof(int1)) < 0) { 680 fatal("rip IPV6_HOPLIMIT"); 681 /*NOTREACHED*/ 682 } 683#endif 684 freeaddrinfo(res); 685 686 memset(&hints, 0, sizeof(hints)); 687 hints.ai_family = PF_INET6; 688 hints.ai_socktype = SOCK_DGRAM; 689 hints.ai_protocol = IPPROTO_UDP; 690 error = getaddrinfo(RIP6_DEST, port, &hints, &res); 691 if (error) { 692 fatal("%s", gai_strerror(error)); 693 /*NOTREACHED*/ 694 } 695 if (res->ai_next) { 696 fatal("%s resolved to multiple address", RIP6_DEST); 697 /*NOTREACHED*/ 698 } 699 memcpy(&ripsin, res->ai_addr, res->ai_addrlen); 700 freeaddrinfo(res); 701 702#ifdef HAVE_POLL_H 703 set[0].fd = ripsock; 704 set[0].events = POLLIN; 705#else 706 maxfd = ripsock; 707#endif 708 709 if (nflag == 0) { 710 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) { 711 fatal("route socket"); 712 /*NOTREACHED*/ 713 } 714#ifdef HAVE_POLL_H 715 set[1].fd = rtsock; 716 set[1].events = POLLIN; 717#else 718 if (rtsock > maxfd) 719 maxfd = rtsock; 720#endif 721 } else { 722#ifdef HAVE_POLL_H 723 set[1].fd = -1; 724#else 725 rtsock = -1; /*just for safety */ 726#endif 727 } 728 729#ifndef HAVE_POLL_H 730 fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask); 731 if ((sockvecp = malloc(fdmasks)) == NULL) { 732 fatal("malloc"); 733 /*NOTREACHED*/ 734 } 735 if ((recvecp = malloc(fdmasks)) == NULL) { 736 fatal("malloc"); 737 /*NOTREACHED*/ 738 } 739 memset(sockvecp, 0, fdmasks); 740 FD_SET(ripsock, sockvecp); 741 if (rtsock >= 0) 742 FD_SET(rtsock, sockvecp); 743#endif 744} 745 746#define RIPSIZE(n) \ 747 (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6)) 748 749/* 750 * ripflush flushes the rip datagram stored in the rip buffer 751 */ 752static void 753ripflush(struct ifc *ifcp, struct sockaddr_in6 *sin6, int nrt, struct netinfo6 *np) 754{ 755 int i; 756 int error; 757 758 if (ifcp) 759 tracet(1, "Send(%s): info(%d) to %s.%d\n", 760 ifcp->ifc_name, nrt, 761 inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port)); 762 else 763 tracet(1, "Send: info(%d) to %s.%d\n", 764 nrt, inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port)); 765 if (dflag >= 2) { 766 np = ripbuf->rip6_nets; 767 for (i = 0; i < nrt; i++, np++) { 768 if (np->rip6_metric == NEXTHOP_METRIC) { 769 if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) 770 trace(2, " NextHop reset"); 771 else { 772 trace(2, " NextHop %s", 773 inet6_n2p(&np->rip6_dest)); 774 } 775 } else { 776 trace(2, " %s/%d[%d]", 777 inet6_n2p(&np->rip6_dest), 778 np->rip6_plen, np->rip6_metric); 779 } 780 if (np->rip6_tag) { 781 trace(2, " tag=0x%04x", 782 ntohs(np->rip6_tag) & 0xffff); 783 } 784 trace(2, "\n"); 785 } 786 } 787 error = sendpacket(sin6, RIPSIZE(nrt)); 788 if (error == EAFNOSUPPORT) { 789 /* Protocol not supported */ 790 if (ifcp != NULL) { 791 tracet(1, "Could not send info to %s (%s): " 792 "set IFF_UP to 0\n", 793 ifcp->ifc_name, 794 inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 795 /* As if down for AF_INET6 */ 796 ifcp->ifc_flags &= ~IFF_UP; 797 } else { 798 tracet(1, "Could not send info to %s\n", 799 inet6_n2p(&sin6->sin6_addr)); 800 } 801 } 802} 803 804/* 805 * Generate RIP6_RESPONSE packets and send them. 806 */ 807static void 808ripsend(struct ifc *ifcp, struct sockaddr_in6 *sin6, int flag) 809{ 810 struct riprt *rrt; 811 struct in6_addr *nh; /* next hop */ 812 struct netinfo6 *np; 813 int maxrte; 814 int nrt; 815 816 if (qflag) 817 return; 818 819 if (ifcp == NULL) { 820 /* 821 * Request from non-link local address is not 822 * a regular route6d update. 823 */ 824 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) - 825 sizeof(struct udphdr) - 826 sizeof(struct rip6) + sizeof(struct netinfo6)) / 827 sizeof(struct netinfo6); 828 nh = NULL; 829 nrt = 0; 830 np = ripbuf->rip6_nets; 831 TAILQ_FOREACH(rrt, &riprt_head, rrt_next) { 832 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 833 continue; 834 /* Put the route to the buffer */ 835 *np = rrt->rrt_info; 836 np++; nrt++; 837 if (nrt == maxrte) { 838 ripflush(NULL, sin6, nrt, np); 839 nh = NULL; 840 nrt = 0; 841 np = ripbuf->rip6_nets; 842 } 843 } 844 if (nrt) /* Send last packet */ 845 ripflush(NULL, sin6, nrt, np); 846 return; 847 } 848 849 if ((flag & RRTF_SENDANYWAY) == 0 && 850 (qflag || (ifcp->ifc_flags & IFF_LOOPBACK))) 851 return; 852 853 /* -N: no use */ 854 if (iff_find(ifcp, IFIL_TYPE_N) != NULL) 855 return; 856 857 /* -T: generate default route only */ 858 if (iff_find(ifcp, IFIL_TYPE_T) != NULL) { 859 struct netinfo6 rrt_info; 860 memset(&rrt_info, 0, sizeof(struct netinfo6)); 861 rrt_info.rip6_dest = in6addr_any; 862 rrt_info.rip6_plen = 0; 863 rrt_info.rip6_metric = 1; 864 rrt_info.rip6_metric += ifcp->ifc_metric; 865 rrt_info.rip6_tag = htons(routetag & 0xffff); 866 np = ripbuf->rip6_nets; 867 *np = rrt_info; 868 nrt = 1; 869 ripflush(ifcp, sin6, nrt, np); 870 return; 871 } 872 873 maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) - 874 sizeof(struct udphdr) - 875 sizeof(struct rip6) + sizeof(struct netinfo6)) / 876 sizeof(struct netinfo6); 877 878 nrt = 0; np = ripbuf->rip6_nets; nh = NULL; 879 TAILQ_FOREACH(rrt, &riprt_head, rrt_next) { 880 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 881 continue; 882 883 /* Need to check filter here */ 884 if (out_filter(rrt, ifcp) == 0) 885 continue; 886 887 /* Check split horizon and other conditions */ 888 if (tobeadv(rrt, ifcp) == 0) 889 continue; 890 891 /* Only considers the routes with flag if specified */ 892 if ((flag & RRTF_CHANGED) && 893 (rrt->rrt_rflags & RRTF_CHANGED) == 0) 894 continue; 895 896 /* Check nexthop */ 897 if (rrt->rrt_index == ifcp->ifc_index && 898 !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) && 899 (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) { 900 if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) { 901 if (nrt == maxrte - 2) { 902 ripflush(ifcp, sin6, nrt, np); 903 nh = NULL; 904 nrt = 0; 905 np = ripbuf->rip6_nets; 906 } 907 908 np->rip6_dest = rrt->rrt_gw; 909 np->rip6_plen = 0; 910 np->rip6_tag = 0; 911 np->rip6_metric = NEXTHOP_METRIC; 912 nh = &rrt->rrt_gw; 913 np++; nrt++; 914 } 915 } else if (nh && (rrt->rrt_index != ifcp->ifc_index || 916 !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) || 917 rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) { 918 /* Reset nexthop */ 919 if (nrt == maxrte - 2) { 920 ripflush(ifcp, sin6, nrt, np); 921 nh = NULL; 922 nrt = 0; 923 np = ripbuf->rip6_nets; 924 } 925 memset(np, 0, sizeof(struct netinfo6)); 926 np->rip6_metric = NEXTHOP_METRIC; 927 nh = NULL; 928 np++; nrt++; 929 } 930 931 /* Put the route to the buffer */ 932 *np = rrt->rrt_info; 933 np++; nrt++; 934 if (nrt == maxrte) { 935 ripflush(ifcp, sin6, nrt, np); 936 nh = NULL; 937 nrt = 0; 938 np = ripbuf->rip6_nets; 939 } 940 } 941 if (nrt) /* Send last packet */ 942 ripflush(ifcp, sin6, nrt, np); 943} 944 945/* 946 * outbound filter logic, per-route/interface. 947 */ 948static int 949out_filter(struct riprt *rrt, struct ifc *ifcp) 950{ 951 struct iff *iffp; 952 struct in6_addr ia; 953 int ok; 954 955 /* 956 * -A: filter out less specific routes, if we have aggregated 957 * route configured. 958 */ 959 TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) { 960 if (iffp->iff_type != 'A') 961 continue; 962 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen) 963 continue; 964 ia = rrt->rrt_info.rip6_dest; 965 applyplen(&ia, iffp->iff_plen); 966 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) 967 return 0; 968 } 969 970 /* 971 * if it is an aggregated route, advertise it only to the 972 * interfaces specified on -A. 973 */ 974 if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) { 975 ok = 0; 976 TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) { 977 if (iffp->iff_type != 'A') 978 continue; 979 if (rrt->rrt_info.rip6_plen == iffp->iff_plen && 980 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 981 &iffp->iff_addr)) { 982 ok = 1; 983 break; 984 } 985 } 986 if (!ok) 987 return 0; 988 } 989 990 /* 991 * -O: advertise only if prefix matches the configured prefix. 992 */ 993 if (iff_find(ifcp, IFIL_TYPE_O) != NULL) { 994 ok = 0; 995 TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) { 996 if (iffp->iff_type != 'O') 997 continue; 998 if (rrt->rrt_info.rip6_plen < iffp->iff_plen) 999 continue; 1000 ia = rrt->rrt_info.rip6_dest; 1001 applyplen(&ia, iffp->iff_plen); 1002 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 1003 ok = 1; 1004 break; 1005 } 1006 } 1007 if (!ok) 1008 return 0; 1009 } 1010 1011 /* the prefix should be advertised */ 1012 return 1; 1013} 1014 1015/* 1016 * Determine if the route is to be advertised on the specified interface. 1017 * It checks options specified in the arguments and the split horizon rule. 1018 */ 1019static int 1020tobeadv(struct riprt *rrt, struct ifc *ifcp) 1021{ 1022 1023 /* Special care for static routes */ 1024 if (rrt->rrt_flags & RTF_STATIC) { 1025 /* XXX don't advertise reject/blackhole routes */ 1026 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE)) 1027 return 0; 1028 1029 if (Sflag) /* Yes, advertise it anyway */ 1030 return 1; 1031 if (sflag && rrt->rrt_index != ifcp->ifc_index) 1032 return 1; 1033 return 0; 1034 } 1035 /* Regular split horizon */ 1036 if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index) 1037 return 0; 1038 return 1; 1039} 1040 1041/* 1042 * Send a rip packet actually. 1043 */ 1044static int 1045sendpacket(struct sockaddr_in6 *sin6, int len) 1046{ 1047 struct msghdr m; 1048 struct cmsghdr *cm; 1049 struct iovec iov[2]; 1050 struct in6_pktinfo *pi; 1051 u_char cmsgbuf[256]; 1052 int idx; 1053 struct sockaddr_in6 sincopy; 1054 1055 /* do not overwrite the given sin */ 1056 sincopy = *sin6; 1057 sin6 = &sincopy; 1058 1059 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) || 1060 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1061 idx = sin6->sin6_scope_id; 1062 else 1063 idx = 0; 1064 1065 m.msg_name = (caddr_t)sin6; 1066 m.msg_namelen = sizeof(*sin6); 1067 iov[0].iov_base = (caddr_t)ripbuf; 1068 iov[0].iov_len = len; 1069 m.msg_iov = iov; 1070 m.msg_iovlen = 1; 1071 m.msg_flags = 0; 1072 if (!idx) { 1073 m.msg_control = NULL; 1074 m.msg_controllen = 0; 1075 } else { 1076 memset(cmsgbuf, 0, sizeof(cmsgbuf)); 1077 cm = (struct cmsghdr *)(void *)cmsgbuf; 1078 m.msg_control = (caddr_t)cm; 1079 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); 1080 1081 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 1082 cm->cmsg_level = IPPROTO_IPV6; 1083 cm->cmsg_type = IPV6_PKTINFO; 1084 pi = (struct in6_pktinfo *)(void *)CMSG_DATA(cm); 1085 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/ 1086 pi->ipi6_ifindex = idx; 1087 } 1088 1089 if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) { 1090 trace(1, "sendmsg: %s\n", strerror(errno)); 1091 return errno; 1092 } 1093 1094 return 0; 1095} 1096 1097/* 1098 * Receive and process RIP packets. Update the routes/kernel forwarding 1099 * table if necessary. 1100 */ 1101static void 1102riprecv(void) 1103{ 1104 struct ifc *ifcp, *ic; 1105 struct sockaddr_in6 fsock; 1106 struct in6_addr nh; /* next hop */ 1107 struct rip6 *rp; 1108 struct netinfo6 *np, *nq; 1109 struct riprt *rrt; 1110 ssize_t len, nn; 1111 unsigned int need_trigger, idx; 1112 char buf[4 * RIP6_MAXMTU]; 1113 time_t t; 1114 struct msghdr m; 1115 struct cmsghdr *cm; 1116 struct iovec iov[2]; 1117 u_char cmsgbuf[256]; 1118 struct in6_pktinfo *pi = NULL; 1119 int *hlimp = NULL; 1120 struct iff *iffp; 1121 struct in6_addr ia; 1122 int ok; 1123 time_t t_half_lifetime; 1124 1125 need_trigger = 0; 1126 1127 m.msg_name = (caddr_t)&fsock; 1128 m.msg_namelen = sizeof(fsock); 1129 iov[0].iov_base = (caddr_t)buf; 1130 iov[0].iov_len = sizeof(buf); 1131 m.msg_iov = iov; 1132 m.msg_iovlen = 1; 1133 cm = (struct cmsghdr *)(void *)cmsgbuf; 1134 m.msg_control = (caddr_t)cm; 1135 m.msg_controllen = sizeof(cmsgbuf); 1136 m.msg_flags = 0; 1137 if ((len = recvmsg(ripsock, &m, 0)) < 0) { 1138 fatal("recvmsg"); 1139 /*NOTREACHED*/ 1140 } 1141 idx = 0; 1142 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m); 1143 cm; 1144 cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) { 1145 if (cm->cmsg_level != IPPROTO_IPV6) 1146 continue; 1147 switch (cm->cmsg_type) { 1148 case IPV6_PKTINFO: 1149 if (cm->cmsg_len != CMSG_LEN(sizeof(*pi))) { 1150 trace(1, 1151 "invalid cmsg length for IPV6_PKTINFO\n"); 1152 return; 1153 } 1154 pi = (struct in6_pktinfo *)(void *)CMSG_DATA(cm); 1155 idx = pi->ipi6_ifindex; 1156 break; 1157 case IPV6_HOPLIMIT: 1158 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) { 1159 trace(1, 1160 "invalid cmsg length for IPV6_HOPLIMIT\n"); 1161 return; 1162 } 1163 hlimp = (int *)(void *)CMSG_DATA(cm); 1164 break; 1165 } 1166 } 1167 1168 if ((size_t)len < sizeof(struct rip6)) { 1169 trace(1, "Packet too short\n"); 1170 return; 1171 } 1172 1173 if (pi == NULL || hlimp == NULL) { 1174 /* 1175 * This can happen when the kernel failed to allocate memory 1176 * for the ancillary data. Although we might be able to handle 1177 * some cases without this info, those are minor and not so 1178 * important, so it's better to discard the packet for safer 1179 * operation. 1180 */ 1181 trace(1, "IPv6 packet information cannot be retrieved\n"); 1182 return; 1183 } 1184 1185 nh = fsock.sin6_addr; 1186 nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) / 1187 sizeof(struct netinfo6); 1188 rp = (struct rip6 *)(void *)buf; 1189 np = rp->rip6_nets; 1190 1191 if (rp->rip6_vers != RIP6_VERSION) { 1192 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers); 1193 return; 1194 } 1195 if (rp->rip6_cmd == RIP6_REQUEST) { 1196 if (idx && idx < nindex2ifc) { 1197 ifcp = index2ifc[idx]; 1198 riprequest(ifcp, np, nn, &fsock); 1199 } else { 1200 riprequest(NULL, np, nn, &fsock); 1201 } 1202 return; 1203 } 1204 1205 if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) { 1206 trace(1, "Response from non-ll addr: %s\n", 1207 inet6_n2p(&fsock.sin6_addr)); 1208 return; /* Ignore packets from non-link-local addr */ 1209 } 1210 if (ntohs(fsock.sin6_port) != RIP6_PORT) { 1211 trace(1, "Response from non-rip port from %s\n", 1212 inet6_n2p(&fsock.sin6_addr)); 1213 return; 1214 } 1215 if (IN6_IS_ADDR_MULTICAST(&pi->ipi6_addr) && *hlimp != 255) { 1216 trace(1, 1217 "Response packet with a smaller hop limit (%d) from %s\n", 1218 *hlimp, inet6_n2p(&fsock.sin6_addr)); 1219 return; 1220 } 1221 /* 1222 * Further validation: since this program does not send off-link 1223 * requests, an incoming response must always come from an on-link 1224 * node. Although this is normally ensured by the source address 1225 * check above, it may not 100% be safe because there are router 1226 * implementations that (invalidly) allow a packet with a link-local 1227 * source address to be forwarded to a different link. 1228 * So we also check whether the destination address is a link-local 1229 * address or the hop limit is 255. Note that RFC2080 does not require 1230 * the specific hop limit for a unicast response, so we cannot assume 1231 * the limitation. 1232 */ 1233 if (!IN6_IS_ADDR_LINKLOCAL(&pi->ipi6_addr) && *hlimp != 255) { 1234 trace(1, 1235 "Response packet possibly from an off-link node: " 1236 "from %s to %s hlim=%d\n", 1237 inet6_n2p(&fsock.sin6_addr), 1238 inet6_n2p(&pi->ipi6_addr), *hlimp); 1239 return; 1240 } 1241 1242 idx = fsock.sin6_scope_id; 1243 ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL; 1244 if (!ifcp) { 1245 trace(1, "Packets to unknown interface index %d\n", idx); 1246 return; /* Ignore it */ 1247 } 1248 if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr)) 1249 return; /* The packet is from me; ignore */ 1250 if (rp->rip6_cmd != RIP6_RESPONSE) { 1251 trace(1, "Invalid command %d\n", rp->rip6_cmd); 1252 return; 1253 } 1254 1255 /* -N: no use */ 1256 if (iff_find(ifcp, IFIL_TYPE_N) != NULL) 1257 return; 1258 1259 tracet(1, "Recv(%s): from %s.%d info(%zd)\n", 1260 ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn); 1261 1262 t = time(NULL); 1263 t_half_lifetime = t - (RIP_LIFETIME/2); 1264 for (; nn; nn--, np++) { 1265 if (np->rip6_metric == NEXTHOP_METRIC) { 1266 /* modify neighbor address */ 1267 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1268 nh = np->rip6_dest; 1269 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1270 } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) { 1271 nh = fsock.sin6_addr; 1272 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1273 } else { 1274 nh = fsock.sin6_addr; 1275 trace(1, "\tInvalid Nexthop: %s\n", 1276 inet6_n2p(&np->rip6_dest)); 1277 } 1278 continue; 1279 } 1280 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) { 1281 trace(1, "\tMulticast netinfo6: %s/%d [%d]\n", 1282 inet6_n2p(&np->rip6_dest), 1283 np->rip6_plen, np->rip6_metric); 1284 continue; 1285 } 1286 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) { 1287 trace(1, "\tLoopback netinfo6: %s/%d [%d]\n", 1288 inet6_n2p(&np->rip6_dest), 1289 np->rip6_plen, np->rip6_metric); 1290 continue; 1291 } 1292 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1293 trace(1, "\tLink Local netinfo6: %s/%d [%d]\n", 1294 inet6_n2p(&np->rip6_dest), 1295 np->rip6_plen, np->rip6_metric); 1296 continue; 1297 } 1298 /* may need to pass sitelocal prefix in some case, however*/ 1299 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) { 1300 trace(1, "\tSite Local netinfo6: %s/%d [%d]\n", 1301 inet6_n2p(&np->rip6_dest), 1302 np->rip6_plen, np->rip6_metric); 1303 continue; 1304 } 1305 trace(2, "\tnetinfo6: %s/%d [%d]", 1306 inet6_n2p(&np->rip6_dest), 1307 np->rip6_plen, np->rip6_metric); 1308 if (np->rip6_tag) 1309 trace(2, " tag=0x%04x", ntohs(np->rip6_tag) & 0xffff); 1310 if (dflag >= 2) { 1311 ia = np->rip6_dest; 1312 applyplen(&ia, np->rip6_plen); 1313 if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest)) 1314 trace(2, " [junk outside prefix]"); 1315 } 1316 1317 /* 1318 * -L: listen only if the prefix matches the configuration 1319 */ 1320 ok = 1; /* if there's no L filter, it is ok */ 1321 TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) { 1322 if (iffp->iff_type != IFIL_TYPE_L) 1323 continue; 1324 ok = 0; 1325 if (np->rip6_plen < iffp->iff_plen) 1326 continue; 1327 /* special rule: ::/0 means default, not "in /0" */ 1328 if (iffp->iff_plen == 0 && np->rip6_plen > 0) 1329 continue; 1330 ia = np->rip6_dest; 1331 applyplen(&ia, iffp->iff_plen); 1332 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 1333 ok = 1; 1334 break; 1335 } 1336 } 1337 if (!ok) { 1338 trace(2, " (filtered)\n"); 1339 continue; 1340 } 1341 1342 trace(2, "\n"); 1343 np->rip6_metric++; 1344 np->rip6_metric += ifcp->ifc_metric; 1345 if (np->rip6_metric > HOPCNT_INFINITY6) 1346 np->rip6_metric = HOPCNT_INFINITY6; 1347 1348 applyplen(&np->rip6_dest, np->rip6_plen); 1349 if ((rrt = rtsearch(np)) != NULL) { 1350 if (rrt->rrt_t == 0) 1351 continue; /* Intf route has priority */ 1352 nq = &rrt->rrt_info; 1353 if (nq->rip6_metric > np->rip6_metric) { 1354 if (rrt->rrt_index == ifcp->ifc_index && 1355 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1356 /* Small metric from the same gateway */ 1357 nq->rip6_metric = np->rip6_metric; 1358 } else { 1359 /* Better route found */ 1360 rrt->rrt_index = ifcp->ifc_index; 1361 /* Update routing table */ 1362 delroute(nq, &rrt->rrt_gw); 1363 rrt->rrt_gw = nh; 1364 *nq = *np; 1365 addroute(rrt, &nh, ifcp); 1366 } 1367 rrt->rrt_rflags |= RRTF_CHANGED; 1368 rrt->rrt_t = t; 1369 need_trigger = 1; 1370 } else if (nq->rip6_metric < np->rip6_metric && 1371 rrt->rrt_index == ifcp->ifc_index && 1372 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1373 /* Got worse route from same gw */ 1374 nq->rip6_metric = np->rip6_metric; 1375 rrt->rrt_t = t; 1376 rrt->rrt_rflags |= RRTF_CHANGED; 1377 need_trigger = 1; 1378 } else if (nq->rip6_metric == np->rip6_metric && 1379 np->rip6_metric < HOPCNT_INFINITY6) { 1380 if (rrt->rrt_index == ifcp->ifc_index && 1381 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1382 /* same metric, same route from same gw */ 1383 rrt->rrt_t = t; 1384 } else if (rrt->rrt_t < t_half_lifetime) { 1385 /* Better route found */ 1386 rrt->rrt_index = ifcp->ifc_index; 1387 /* Update routing table */ 1388 delroute(nq, &rrt->rrt_gw); 1389 rrt->rrt_gw = nh; 1390 *nq = *np; 1391 addroute(rrt, &nh, ifcp); 1392 rrt->rrt_rflags |= RRTF_CHANGED; 1393 rrt->rrt_t = t; 1394 } 1395 } 1396 /* 1397 * if nq->rip6_metric == HOPCNT_INFINITY6 then 1398 * do not update age value. Do nothing. 1399 */ 1400 } else if (np->rip6_metric < HOPCNT_INFINITY6) { 1401 /* Got a new valid route */ 1402 if ((rrt = MALLOC(struct riprt)) == NULL) { 1403 fatal("malloc: struct riprt"); 1404 /*NOTREACHED*/ 1405 } 1406 memset(rrt, 0, sizeof(*rrt)); 1407 nq = &rrt->rrt_info; 1408 1409 rrt->rrt_same = NULL; 1410 rrt->rrt_index = ifcp->ifc_index; 1411 rrt->rrt_flags = RTF_UP|RTF_GATEWAY; 1412 rrt->rrt_gw = nh; 1413 *nq = *np; 1414 applyplen(&nq->rip6_dest, nq->rip6_plen); 1415 if (nq->rip6_plen == sizeof(struct in6_addr) * 8) 1416 rrt->rrt_flags |= RTF_HOST; 1417 1418 /* Update routing table */ 1419 addroute(rrt, &nh, ifcp); 1420 rrt->rrt_rflags |= RRTF_CHANGED; 1421 need_trigger = 1; 1422 rrt->rrt_t = t; 1423 1424 /* Put the route to the list */ 1425 TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next); 1426 } 1427 } 1428 /* XXX need to care the interval between triggered updates */ 1429 if (need_trigger) { 1430 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) { 1431 TAILQ_FOREACH(ic, &ifc_head, ifc_next) { 1432 if (ifcp->ifc_index == ic->ifc_index) 1433 continue; 1434 if (ic->ifc_flags & IFF_UP) 1435 ripsend(ic, &ic->ifc_ripsin, 1436 RRTF_CHANGED); 1437 } 1438 } 1439 /* Reset the flag */ 1440 TAILQ_FOREACH(rrt, &riprt_head, rrt_next) { 1441 rrt->rrt_rflags &= ~RRTF_CHANGED; 1442 } 1443 } 1444} 1445 1446/* 1447 * Send all routes request packet to the specified interface. 1448 */ 1449static void 1450sendrequest(struct ifc *ifcp) 1451{ 1452 struct netinfo6 *np; 1453 int error; 1454 1455 if (ifcp->ifc_flags & IFF_LOOPBACK) 1456 return; 1457 ripbuf->rip6_cmd = RIP6_REQUEST; 1458 np = ripbuf->rip6_nets; 1459 memset(np, 0, sizeof(struct netinfo6)); 1460 np->rip6_metric = HOPCNT_INFINITY6; 1461 tracet(1, "Send rtdump Request to %s (%s)\n", 1462 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1463 error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1)); 1464 if (error == EAFNOSUPPORT) { 1465 /* Protocol not supported */ 1466 tracet(1, "Could not send rtdump Request to %s (%s): " 1467 "set IFF_UP to 0\n", 1468 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1469 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 1470 } 1471 ripbuf->rip6_cmd = RIP6_RESPONSE; 1472} 1473 1474/* 1475 * Process a RIP6_REQUEST packet. 1476 */ 1477static void 1478riprequest(struct ifc *ifcp, 1479 struct netinfo6 *np, 1480 int nn, 1481 struct sockaddr_in6 *sin6) 1482{ 1483 int i; 1484 struct riprt *rrt; 1485 1486 if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) && 1487 np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) { 1488 /* Specific response, don't split-horizon */ 1489 trace(1, "\tRIP Request\n"); 1490 for (i = 0; i < nn; i++, np++) { 1491 rrt = rtsearch(np); 1492 if (rrt) 1493 np->rip6_metric = rrt->rrt_info.rip6_metric; 1494 else 1495 np->rip6_metric = HOPCNT_INFINITY6; 1496 } 1497 (void)sendpacket(sin6, RIPSIZE(nn)); 1498 return; 1499 } 1500 /* Whole routing table dump */ 1501 trace(1, "\tRIP Request -- whole routing table\n"); 1502 ripsend(ifcp, sin6, RRTF_SENDANYWAY); 1503} 1504 1505/* 1506 * Get information of each interface. 1507 */ 1508static void 1509ifconfig(void) 1510{ 1511 struct ifaddrs *ifap, *ifa; 1512 struct ifc *ifcp; 1513 struct ipv6_mreq mreq; 1514 int s; 1515 1516 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 1517 fatal("socket"); 1518 /*NOTREACHED*/ 1519 } 1520 1521 if (getifaddrs(&ifap) != 0) { 1522 fatal("getifaddrs"); 1523 /*NOTREACHED*/ 1524 } 1525 1526 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 1527 if (ifa->ifa_addr->sa_family != AF_INET6) 1528 continue; 1529 ifcp = ifc_find(ifa->ifa_name); 1530 /* we are interested in multicast-capable interfaces */ 1531 if ((ifa->ifa_flags & IFF_MULTICAST) == 0) 1532 continue; 1533 if (!ifcp) { 1534 /* new interface */ 1535 if ((ifcp = MALLOC(struct ifc)) == NULL) { 1536 fatal("malloc: struct ifc"); 1537 /*NOTREACHED*/ 1538 } 1539 memset(ifcp, 0, sizeof(*ifcp)); 1540 1541 ifcp->ifc_index = -1; 1542 strlcpy(ifcp->ifc_name, ifa->ifa_name, 1543 sizeof(ifcp->ifc_name)); 1544 TAILQ_INIT(&ifcp->ifc_ifac_head); 1545 TAILQ_INIT(&ifcp->ifc_iff_head); 1546 ifcp->ifc_flags = ifa->ifa_flags; 1547 TAILQ_INSERT_HEAD(&ifc_head, ifcp, ifc_next); 1548 trace(1, "newif %s <%s>\n", ifcp->ifc_name, 1549 ifflags(ifcp->ifc_flags)); 1550 if (!strcmp(ifcp->ifc_name, LOOPBACK_IF)) 1551 loopifcp = ifcp; 1552 } else { 1553 /* update flag, this may be up again */ 1554 if (ifcp->ifc_flags != ifa->ifa_flags) { 1555 trace(1, "%s: <%s> -> ", ifcp->ifc_name, 1556 ifflags(ifcp->ifc_flags)); 1557 trace(1, "<%s>\n", ifflags(ifa->ifa_flags)); 1558 ifcp->ifc_cflags |= IFC_CHANGED; 1559 } 1560 ifcp->ifc_flags = ifa->ifa_flags; 1561 } 1562 if (ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s) < 0) { 1563 /* maybe temporary failure */ 1564 continue; 1565 } 1566 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP 1567 && 0 < ifcp->ifc_index && !ifcp->ifc_joined) { 1568 mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr; 1569 mreq.ipv6mr_interface = ifcp->ifc_index; 1570 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP, 1571 &mreq, sizeof(mreq)) < 0) { 1572 fatal("IPV6_JOIN_GROUP"); 1573 /*NOTREACHED*/ 1574 } 1575 trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST); 1576 ifcp->ifc_joined++; 1577 } 1578 } 1579 close(s); 1580 freeifaddrs(ifap); 1581} 1582 1583static int 1584ifconfig1(const char *name, 1585 const struct sockaddr *sa, 1586 struct ifc *ifcp, 1587 int s) 1588{ 1589 struct in6_ifreq ifr; 1590 const struct sockaddr_in6 *sin6; 1591 struct ifac *ifac; 1592 int plen; 1593 char buf[BUFSIZ]; 1594 1595 sin6 = (const struct sockaddr_in6 *)(const void *)sa; 1596 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) && !lflag) 1597 return (-1); 1598 ifr.ifr_addr = *sin6; 1599 strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 1600 if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) { 1601 syslog(LOG_INFO, "ioctl: SIOCGIFNETMASK_IN6"); 1602 return (-1); 1603 } 1604 plen = sin6mask2len(&ifr.ifr_addr); 1605 if ((ifac = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) { 1606 /* same interface found */ 1607 /* need check if something changed */ 1608 /* XXX not yet implemented */ 1609 return (-1); 1610 } 1611 /* 1612 * New address is found 1613 */ 1614 if ((ifac = MALLOC(struct ifac)) == NULL) { 1615 fatal("malloc: struct ifac"); 1616 /*NOTREACHED*/ 1617 } 1618 memset(ifac, 0, sizeof(*ifac)); 1619 1620 ifac->ifac_ifc = ifcp; 1621 ifac->ifac_addr = sin6->sin6_addr; 1622 ifac->ifac_plen = plen; 1623 ifac->ifac_scope_id = sin6->sin6_scope_id; 1624 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1625 ifr.ifr_addr = *sin6; 1626 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) { 1627 fatal("ioctl: SIOCGIFDSTADDR_IN6"); 1628 /*NOTREACHED*/ 1629 } 1630 ifac->ifac_raddr = ifr.ifr_dstaddr.sin6_addr; 1631 inet_ntop(AF_INET6, (void *)&ifac->ifac_raddr, buf, 1632 sizeof(buf)); 1633 trace(1, "found address %s/%d -- %s\n", 1634 inet6_n2p(&ifac->ifac_addr), ifac->ifac_plen, buf); 1635 } else { 1636 trace(1, "found address %s/%d\n", 1637 inet6_n2p(&ifac->ifac_addr), ifac->ifac_plen); 1638 } 1639 if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifac->ifac_addr)) { 1640 ifcp->ifc_mylladdr = ifac->ifac_addr; 1641 ifcp->ifc_index = ifac->ifac_scope_id; 1642 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len); 1643 ifcp->ifc_ripsin.sin6_scope_id = ifcp->ifc_index; 1644 setindex2ifc(ifcp->ifc_index, ifcp); 1645 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index); 1646 if (ifcp->ifc_mtu > RIP6_MAXMTU) 1647 ifcp->ifc_mtu = RIP6_MAXMTU; 1648 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) { 1649 fatal("ioctl: SIOCGIFMETRIC"); 1650 /*NOTREACHED*/ 1651 } 1652 ifcp->ifc_metric = ifr.ifr_metric; 1653 trace(1, "\tindex: %d, mtu: %d, metric: %d\n", 1654 ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric); 1655 } else 1656 ifcp->ifc_cflags |= IFC_CHANGED; 1657 1658 TAILQ_INSERT_HEAD(&ifcp->ifc_ifac_head, ifac, ifac_next); 1659 1660 return 0; 1661} 1662 1663static void 1664ifremove(int ifindex) 1665{ 1666 struct ifc *ifcp; 1667 struct riprt *rrt; 1668 1669 TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) { 1670 if (ifcp->ifc_index == ifindex) 1671 break; 1672 } 1673 if (ifcp == NULL) 1674 return; 1675 1676 tracet(1, "ifremove: %s is departed.\n", ifcp->ifc_name); 1677 TAILQ_REMOVE(&ifc_head, ifcp, ifc_next); 1678 1679 TAILQ_FOREACH(rrt, &riprt_head, rrt_next) { 1680 if (rrt->rrt_index == ifcp->ifc_index && 1681 rrt->rrt_rflags & RRTF_AGGREGATE) 1682 delroute(&rrt->rrt_info, &rrt->rrt_gw); 1683 } 1684 free(ifcp); 1685} 1686 1687/* 1688 * Receive and process routing messages. 1689 * Update interface information as necessary. 1690 */ 1691static void 1692rtrecv(void) 1693{ 1694 char buf[BUFSIZ]; 1695 char *p, *q = NULL; 1696 struct rt_msghdr *rtm; 1697 struct ifa_msghdr *ifam; 1698 struct if_msghdr *ifm; 1699 struct if_announcemsghdr *ifan; 1700 int len; 1701 struct ifc *ifcp, *ic; 1702 int iface = 0, rtable = 0; 1703 struct sockaddr_in6 *rta[RTAX_MAX]; 1704 struct sockaddr_in6 mask; 1705 int i, addrs = 0; 1706 struct riprt *rrt; 1707 1708 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 1709 perror("read from rtsock"); 1710 exit(1); 1711 } 1712 if (len == 0) 1713 return; 1714#if 0 1715 if (len < sizeof(*rtm)) { 1716 trace(1, "short read from rtsock: %d (should be > %lu)\n", 1717 len, (u_long)sizeof(*rtm)); 1718 return; 1719 } 1720#endif 1721 if (dflag >= 2) { 1722 fprintf(stderr, "rtmsg:\n"); 1723 for (i = 0; i < len; i++) { 1724 fprintf(stderr, "%02x ", buf[i] & 0xff); 1725 if (i % 16 == 15) fprintf(stderr, "\n"); 1726 } 1727 fprintf(stderr, "\n"); 1728 } 1729 1730 for (p = buf; p - buf < len; p += 1731 ((struct rt_msghdr *)(void *)p)->rtm_msglen) { 1732 if (((struct rt_msghdr *)(void *)p)->rtm_version != RTM_VERSION) 1733 continue; 1734 1735 /* safety against bogus message */ 1736 if (((struct rt_msghdr *)(void *)p)->rtm_msglen <= 0) { 1737 trace(1, "bogus rtmsg: length=%d\n", 1738 ((struct rt_msghdr *)(void *)p)->rtm_msglen); 1739 break; 1740 } 1741 rtm = NULL; 1742 ifam = NULL; 1743 ifm = NULL; 1744 switch (((struct rt_msghdr *)(void *)p)->rtm_type) { 1745 case RTM_NEWADDR: 1746 case RTM_DELADDR: 1747 ifam = (struct ifa_msghdr *)(void *)p; 1748 addrs = ifam->ifam_addrs; 1749 q = (char *)(ifam + 1); 1750 break; 1751 case RTM_IFINFO: 1752 ifm = (struct if_msghdr *)(void *)p; 1753 addrs = ifm->ifm_addrs; 1754 q = (char *)(ifm + 1); 1755 break; 1756 case RTM_IFANNOUNCE: 1757 ifan = (struct if_announcemsghdr *)(void *)p; 1758 switch (ifan->ifan_what) { 1759 case IFAN_ARRIVAL: 1760 iface++; 1761 break; 1762 case IFAN_DEPARTURE: 1763 ifremove(ifan->ifan_index); 1764 iface++; 1765 break; 1766 } 1767 break; 1768 default: 1769 rtm = (struct rt_msghdr *)(void *)p; 1770 if (rtm->rtm_version != RTM_VERSION) { 1771 trace(1, "unexpected rtmsg version %d " 1772 "(should be %d)\n", 1773 rtm->rtm_version, RTM_VERSION); 1774 continue; 1775 } 1776 /* 1777 * Only messages that use the struct rt_msghdr 1778 * format are allowed beyond this point. 1779 */ 1780 if (rtm->rtm_type > RTM_RESOLVE) { 1781 trace(1, "rtmsg type %d ignored\n", 1782 rtm->rtm_type); 1783 continue; 1784 } 1785 addrs = rtm->rtm_addrs; 1786 q = (char *)(rtm + 1); 1787 if (rtm->rtm_pid == pid) { 1788#if 0 1789 trace(1, "rtmsg looped back to me, ignored\n"); 1790#endif 1791 continue; 1792 } 1793 break; 1794 } 1795 memset(&rta, 0, sizeof(rta)); 1796 for (i = 0; i < RTAX_MAX; i++) { 1797 if (addrs & (1 << i)) { 1798 rta[i] = (struct sockaddr_in6 *)(void *)q; 1799 q += ROUNDUP(rta[i]->sin6_len); 1800 } 1801 } 1802 1803 trace(1, "rtsock: %s (addrs=%x)\n", 1804 rttypes((struct rt_msghdr *)(void *)p), addrs); 1805 if (dflag >= 2) { 1806 for (i = 0; 1807 i < ((struct rt_msghdr *)(void *)p)->rtm_msglen; 1808 i++) { 1809 fprintf(stderr, "%02x ", p[i] & 0xff); 1810 if (i % 16 == 15) fprintf(stderr, "\n"); 1811 } 1812 fprintf(stderr, "\n"); 1813 } 1814 1815 /* 1816 * Easy ones first. 1817 * 1818 * We may be able to optimize by using ifm->ifm_index or 1819 * ifam->ifam_index. For simplicity we don't do that here. 1820 */ 1821 switch (((struct rt_msghdr *)(void *)p)->rtm_type) { 1822 case RTM_NEWADDR: 1823 case RTM_IFINFO: 1824 iface++; 1825 continue; 1826 case RTM_ADD: 1827 rtable++; 1828 continue; 1829 case RTM_LOSING: 1830 case RTM_MISS: 1831 case RTM_GET: 1832 case RTM_LOCK: 1833 /* nothing to be done here */ 1834 trace(1, "\tnothing to be done, ignored\n"); 1835 continue; 1836 } 1837 1838#if 0 1839 if (rta[RTAX_DST] == NULL) { 1840 trace(1, "\tno destination, ignored\n"); 1841 continue; 1842 } 1843 if (rta[RTAX_DST]->sin6_family != AF_INET6) { 1844 trace(1, "\taf mismatch, ignored\n"); 1845 continue; 1846 } 1847 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) { 1848 trace(1, "\tlinklocal destination, ignored\n"); 1849 continue; 1850 } 1851 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) { 1852 trace(1, "\tloopback destination, ignored\n"); 1853 continue; /* Loopback */ 1854 } 1855 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) { 1856 trace(1, "\tmulticast destination, ignored\n"); 1857 continue; 1858 } 1859#endif 1860 1861 /* hard ones */ 1862 switch (((struct rt_msghdr *)(void *)p)->rtm_type) { 1863 case RTM_NEWADDR: 1864 case RTM_IFINFO: 1865 case RTM_ADD: 1866 case RTM_LOSING: 1867 case RTM_MISS: 1868 case RTM_GET: 1869 case RTM_LOCK: 1870 /* should already be handled */ 1871 fatal("rtrecv: never reach here"); 1872 /*NOTREACHED*/ 1873 case RTM_DELETE: 1874 if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) { 1875 trace(1, "\tsome of dst/gw/netamsk are " 1876 "unavailable, ignored\n"); 1877 break; 1878 } 1879 if ((rtm->rtm_flags & RTF_HOST) != 0) { 1880 mask.sin6_len = sizeof(mask); 1881 memset(&mask.sin6_addr, 0xff, 1882 sizeof(mask.sin6_addr)); 1883 rta[RTAX_NETMASK] = &mask; 1884 } else if (!rta[RTAX_NETMASK]) { 1885 trace(1, "\tsome of dst/gw/netamsk are " 1886 "unavailable, ignored\n"); 1887 break; 1888 } 1889 if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY], 1890 rta[RTAX_NETMASK]) == 0) { 1891 rtable++; /*just to be sure*/ 1892 } 1893 break; 1894 case RTM_CHANGE: 1895 case RTM_REDIRECT: 1896 trace(1, "\tnot supported yet, ignored\n"); 1897 break; 1898 case RTM_DELADDR: 1899 if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) { 1900 trace(1, "\tno netmask or ifa given, ignored\n"); 1901 break; 1902 } 1903 if (ifam->ifam_index < nindex2ifc) 1904 ifcp = index2ifc[ifam->ifam_index]; 1905 else 1906 ifcp = NULL; 1907 if (!ifcp) { 1908 trace(1, "\tinvalid ifam_index %d, ignored\n", 1909 ifam->ifam_index); 1910 break; 1911 } 1912 if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK])) 1913 iface++; 1914 break; 1915 } 1916 1917 } 1918 1919 if (iface) { 1920 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n"); 1921 ifconfig(); 1922 TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) { 1923 if (ifcp->ifc_cflags & IFC_CHANGED) { 1924 if (ifrt(ifcp, 1)) { 1925 TAILQ_FOREACH(ic, &ifc_head, ifc_next) { 1926 if (ifcp->ifc_index == ic->ifc_index) 1927 continue; 1928 if (ic->ifc_flags & IFF_UP) 1929 ripsend(ic, &ic->ifc_ripsin, 1930 RRTF_CHANGED); 1931 } 1932 /* Reset the flag */ 1933 TAILQ_FOREACH(rrt, &riprt_head, rrt_next) { 1934 rrt->rrt_rflags &= ~RRTF_CHANGED; 1935 } 1936 } 1937 ifcp->ifc_cflags &= ~IFC_CHANGED; 1938 } 1939 } 1940 } 1941 if (rtable) { 1942 trace(1, "rtsock: read routing table again\n"); 1943 krtread(1); 1944 } 1945} 1946 1947/* 1948 * remove specified route from the internal routing table. 1949 */ 1950static int 1951rt_del(const struct sockaddr_in6 *sdst, 1952 const struct sockaddr_in6 *sgw, 1953 const struct sockaddr_in6 *smask) 1954{ 1955 const struct in6_addr *dst = NULL; 1956 const struct in6_addr *gw = NULL; 1957 int prefix; 1958 struct netinfo6 ni6; 1959 struct riprt *rrt = NULL; 1960 time_t t_lifetime; 1961 1962 if (sdst->sin6_family != AF_INET6) { 1963 trace(1, "\tother AF, ignored\n"); 1964 return -1; 1965 } 1966 if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr) 1967 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback) 1968 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) { 1969 trace(1, "\taddress %s not interesting, ignored\n", 1970 inet6_n2p(&sdst->sin6_addr)); 1971 return -1; 1972 } 1973 dst = &sdst->sin6_addr; 1974 if (sgw->sin6_family == AF_INET6) { 1975 /* easy case */ 1976 gw = &sgw->sin6_addr; 1977 prefix = sin6mask2len(smask); 1978 } else if (sgw->sin6_family == AF_LINK) { 1979 /* 1980 * Interface route... a hard case. We need to get the prefix 1981 * length from the kernel, but we now are parsing rtmsg. 1982 * We'll purge matching routes from my list, then get the 1983 * fresh list. 1984 */ 1985 struct riprt *longest; 1986 trace(1, "\t%s is an interface route, guessing prefixlen\n", 1987 inet6_n2p(dst)); 1988 longest = NULL; 1989 TAILQ_FOREACH(rrt, &riprt_head, rrt_next) { 1990 if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 1991 &sdst->sin6_addr) 1992 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) { 1993 if (!longest 1994 || longest->rrt_info.rip6_plen < 1995 rrt->rrt_info.rip6_plen) { 1996 longest = rrt; 1997 } 1998 } 1999 } 2000 rrt = longest; 2001 if (!rrt) { 2002 trace(1, "\tno matching interface route found\n"); 2003 return -1; 2004 } 2005 gw = &in6addr_loopback; 2006 prefix = rrt->rrt_info.rip6_plen; 2007 } else { 2008 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family); 2009 return -1; 2010 } 2011 2012 trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix); 2013 trace(1, "gw %s\n", inet6_n2p(gw)); 2014 t_lifetime = time(NULL) - RIP_LIFETIME; 2015 /* age route for interface address */ 2016 memset(&ni6, 0, sizeof(ni6)); 2017 ni6.rip6_dest = *dst; 2018 ni6.rip6_plen = prefix; 2019 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 2020 trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest), 2021 ni6.rip6_plen); 2022 if (!rrt && (rrt = rtsearch(&ni6)) == NULL) { 2023 trace(1, "\tno route found\n"); 2024 return -1; 2025 } 2026#if 0 2027 if ((rrt->rrt_flags & RTF_STATIC) == 0) { 2028 trace(1, "\tyou can delete static routes only\n"); 2029 } else 2030#endif 2031 if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) { 2032 trace(1, "\tgw mismatch: %s <-> ", 2033 inet6_n2p(&rrt->rrt_gw)); 2034 trace(1, "%s\n", inet6_n2p(gw)); 2035 } else { 2036 trace(1, "\troute found, age it\n"); 2037 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 2038 rrt->rrt_t = t_lifetime; 2039 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 2040 } 2041 } 2042 return 0; 2043} 2044 2045/* 2046 * remove specified address from internal interface/routing table. 2047 */ 2048static int 2049rt_deladdr(struct ifc *ifcp, 2050 const struct sockaddr_in6 *sifa, 2051 const struct sockaddr_in6 *smask) 2052{ 2053 const struct in6_addr *addr = NULL; 2054 int prefix; 2055 struct ifac *ifac = NULL; 2056 struct netinfo6 ni6; 2057 struct riprt *rrt = NULL; 2058 time_t t_lifetime; 2059 int updated = 0; 2060 2061 if (sifa->sin6_family != AF_INET6) { 2062 trace(1, "\tother AF, ignored\n"); 2063 return -1; 2064 } 2065 addr = &sifa->sin6_addr; 2066 prefix = sin6mask2len(smask); 2067 2068 trace(1, "\tdeleting %s/%d from %s\n", 2069 inet6_n2p(addr), prefix, ifcp->ifc_name); 2070 ifac = ifa_match(ifcp, addr, prefix); 2071 if (!ifac) { 2072 trace(1, "\tno matching ifa found for %s/%d on %s\n", 2073 inet6_n2p(addr), prefix, ifcp->ifc_name); 2074 return -1; 2075 } 2076 if (ifac->ifac_ifc != ifcp) { 2077 trace(1, "\taddress table corrupt: back pointer does not match " 2078 "(%s != %s)\n", 2079 ifcp->ifc_name, ifac->ifac_ifc->ifc_name); 2080 return -1; 2081 } 2082 TAILQ_REMOVE(&ifcp->ifc_ifac_head, ifac, ifac_next); 2083 t_lifetime = time(NULL) - RIP_LIFETIME; 2084 /* age route for interface address */ 2085 memset(&ni6, 0, sizeof(ni6)); 2086 ni6.rip6_dest = ifac->ifac_addr; 2087 ni6.rip6_plen = ifac->ifac_plen; 2088 applyplen(&ni6.rip6_dest, ni6.rip6_plen); 2089 trace(1, "\tfind interface route %s/%d on %d\n", 2090 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index); 2091 if ((rrt = rtsearch(&ni6)) != NULL) { 2092 struct in6_addr none; 2093 memset(&none, 0, sizeof(none)); 2094 if (rrt->rrt_index == ifcp->ifc_index && 2095 (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) || 2096 IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) { 2097 trace(1, "\troute found, age it\n"); 2098 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 2099 rrt->rrt_t = t_lifetime; 2100 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 2101 } 2102 updated++; 2103 } else { 2104 trace(1, "\tnon-interface route found: %s/%d on %d\n", 2105 inet6_n2p(&rrt->rrt_info.rip6_dest), 2106 rrt->rrt_info.rip6_plen, 2107 rrt->rrt_index); 2108 } 2109 } else 2110 trace(1, "\tno interface route found\n"); 2111 /* age route for p2p destination */ 2112 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 2113 memset(&ni6, 0, sizeof(ni6)); 2114 ni6.rip6_dest = ifac->ifac_raddr; 2115 ni6.rip6_plen = 128; 2116 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 2117 trace(1, "\tfind p2p route %s/%d on %d\n", 2118 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, 2119 ifcp->ifc_index); 2120 if ((rrt = rtsearch(&ni6)) != NULL) { 2121 if (rrt->rrt_index == ifcp->ifc_index && 2122 IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, 2123 &ifac->ifac_addr)) { 2124 trace(1, "\troute found, age it\n"); 2125 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 2126 rrt->rrt_t = t_lifetime; 2127 rrt->rrt_info.rip6_metric = 2128 HOPCNT_INFINITY6; 2129 updated++; 2130 } 2131 } else { 2132 trace(1, "\tnon-p2p route found: %s/%d on %d\n", 2133 inet6_n2p(&rrt->rrt_info.rip6_dest), 2134 rrt->rrt_info.rip6_plen, 2135 rrt->rrt_index); 2136 } 2137 } else 2138 trace(1, "\tno p2p route found\n"); 2139 } 2140 free(ifac); 2141 2142 return ((updated) ? 0 : -1); 2143} 2144 2145/* 2146 * Get each interface address and put those interface routes to the route 2147 * list. 2148 */ 2149static int 2150ifrt(struct ifc *ifcp, int again) 2151{ 2152 struct ifac *ifac; 2153 struct riprt *rrt = NULL, *search_rrt, *loop_rrt; 2154 struct netinfo6 *np; 2155 time_t t_lifetime; 2156 int need_trigger = 0; 2157 2158#if 0 2159 if (ifcp->ifc_flags & IFF_LOOPBACK) 2160 return 0; /* ignore loopback */ 2161#endif 2162 2163 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 2164 ifrt_p2p(ifcp, again); 2165 return 0; 2166 } 2167 2168 TAILQ_FOREACH(ifac, &ifcp->ifc_ifac_head, ifac_next) { 2169 if (IN6_IS_ADDR_LINKLOCAL(&ifac->ifac_addr)) { 2170#if 0 2171 trace(1, "route: %s on %s: " 2172 "skip linklocal interface address\n", 2173 inet6_n2p(&ifac->ifac_addr), ifcp->ifc_name); 2174#endif 2175 continue; 2176 } 2177 if (IN6_IS_ADDR_UNSPECIFIED(&ifac->ifac_addr)) { 2178#if 0 2179 trace(1, "route: %s: skip unspec interface address\n", 2180 ifcp->ifc_name); 2181#endif 2182 continue; 2183 } 2184 if (IN6_IS_ADDR_LOOPBACK(&ifac->ifac_addr)) { 2185#if 0 2186 trace(1, "route: %s: skip loopback address\n", 2187 ifcp->ifc_name); 2188#endif 2189 continue; 2190 } 2191 if (ifcp->ifc_flags & IFF_UP) { 2192 if ((rrt = MALLOC(struct riprt)) == NULL) 2193 fatal("malloc: struct riprt"); 2194 memset(rrt, 0, sizeof(*rrt)); 2195 rrt->rrt_same = NULL; 2196 rrt->rrt_index = ifcp->ifc_index; 2197 rrt->rrt_t = 0; /* don't age */ 2198 rrt->rrt_info.rip6_dest = ifac->ifac_addr; 2199 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2200 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2201 rrt->rrt_info.rip6_plen = ifac->ifac_plen; 2202 rrt->rrt_flags = RTF_HOST; 2203 rrt->rrt_rflags |= RRTF_CHANGED; 2204 applyplen(&rrt->rrt_info.rip6_dest, ifac->ifac_plen); 2205 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2206 rrt->rrt_gw = ifac->ifac_addr; 2207 np = &rrt->rrt_info; 2208 search_rrt = rtsearch(np); 2209 if (search_rrt != NULL) { 2210 if (search_rrt->rrt_info.rip6_metric <= 2211 rrt->rrt_info.rip6_metric) { 2212 /* Already have better route */ 2213 if (!again) { 2214 trace(1, "route: %s/%d: " 2215 "already registered (%s)\n", 2216 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2217 ifcp->ifc_name); 2218 } 2219 goto next; 2220 } 2221 2222 TAILQ_REMOVE(&riprt_head, search_rrt, rrt_next); 2223 delroute(&search_rrt->rrt_info, 2224 &search_rrt->rrt_gw); 2225 free(search_rrt); 2226 } 2227 /* Attach the route to the list */ 2228 trace(1, "route: %s/%d: register route (%s)\n", 2229 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2230 ifcp->ifc_name); 2231 TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next); 2232 addroute(rrt, &rrt->rrt_gw, ifcp); 2233 rrt = NULL; 2234 sendrequest(ifcp); 2235 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 2236 need_trigger = 1; 2237 } else { 2238 TAILQ_FOREACH(loop_rrt, &riprt_head, rrt_next) { 2239 if (loop_rrt->rrt_index == ifcp->ifc_index) { 2240 t_lifetime = time(NULL) - RIP_LIFETIME; 2241 if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) { 2242 loop_rrt->rrt_t = t_lifetime; 2243 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 2244 loop_rrt->rrt_rflags |= RRTF_CHANGED; 2245 need_trigger = 1; 2246 } 2247 } 2248 } 2249 } 2250 next: 2251 if (rrt) 2252 free(rrt); 2253 } 2254 return need_trigger; 2255} 2256 2257/* 2258 * there are couple of p2p interface routing models. "behavior" lets 2259 * you pick one. it looks that gated behavior fits best with BSDs, 2260 * since BSD kernels do not look at prefix length on p2p interfaces. 2261 */ 2262static void 2263ifrt_p2p(struct ifc *ifcp, int again) 2264{ 2265 struct ifac *ifac; 2266 struct riprt *rrt, *orrt; 2267 struct netinfo6 *np; 2268 struct in6_addr addr, dest; 2269 int advert, ignore, i; 2270#define P2PADVERT_NETWORK 1 2271#define P2PADVERT_ADDR 2 2272#define P2PADVERT_DEST 4 2273#define P2PADVERT_MAX 4 2274 const enum { CISCO, GATED, ROUTE6D } behavior = GATED; 2275 const char *category = ""; 2276 const char *noadv; 2277 2278 TAILQ_FOREACH(ifac, &ifcp->ifc_ifac_head, ifac_next) { 2279 addr = ifac->ifac_addr; 2280 dest = ifac->ifac_raddr; 2281 applyplen(&addr, ifac->ifac_plen); 2282 applyplen(&dest, ifac->ifac_plen); 2283 advert = ignore = 0; 2284 switch (behavior) { 2285 case CISCO: 2286 /* 2287 * honor addr/plen, just like normal shared medium 2288 * interface. this may cause trouble if you reuse 2289 * addr/plen on other interfaces. 2290 * 2291 * advertise addr/plen. 2292 */ 2293 advert |= P2PADVERT_NETWORK; 2294 break; 2295 case GATED: 2296 /* 2297 * prefixlen on p2p interface is meaningless. 2298 * advertise addr/128 and dest/128. 2299 * 2300 * do not install network route to route6d routing 2301 * table (if we do, it would prevent route installation 2302 * for other p2p interface that shares addr/plen). 2303 * 2304 * XXX what should we do if dest is ::? it will not 2305 * get announced anyways (see following filter), 2306 * but we need to think. 2307 */ 2308 advert |= P2PADVERT_ADDR; 2309 advert |= P2PADVERT_DEST; 2310 ignore |= P2PADVERT_NETWORK; 2311 break; 2312 case ROUTE6D: 2313 /* 2314 * just for testing. actually the code is redundant 2315 * given the current p2p interface address assignment 2316 * rule for kame kernel. 2317 * 2318 * intent: 2319 * A/n -> announce A/n 2320 * A B/n, A and B share prefix -> A/n (= B/n) 2321 * A B/n, do not share prefix -> A/128 and B/128 2322 * actually, A/64 and A B/128 are the only cases 2323 * permitted by the kernel: 2324 * A/64 -> A/64 2325 * A B/128 -> A/128 and B/128 2326 */ 2327 if (!IN6_IS_ADDR_UNSPECIFIED(&ifac->ifac_raddr)) { 2328 if (IN6_ARE_ADDR_EQUAL(&addr, &dest)) 2329 advert |= P2PADVERT_NETWORK; 2330 else { 2331 advert |= P2PADVERT_ADDR; 2332 advert |= P2PADVERT_DEST; 2333 ignore |= P2PADVERT_NETWORK; 2334 } 2335 } else 2336 advert |= P2PADVERT_NETWORK; 2337 break; 2338 } 2339 2340 for (i = 1; i <= P2PADVERT_MAX; i *= 2) { 2341 if ((ignore & i) != 0) 2342 continue; 2343 if ((rrt = MALLOC(struct riprt)) == NULL) { 2344 fatal("malloc: struct riprt"); 2345 /*NOTREACHED*/ 2346 } 2347 memset(rrt, 0, sizeof(*rrt)); 2348 rrt->rrt_same = NULL; 2349 rrt->rrt_index = ifcp->ifc_index; 2350 rrt->rrt_t = 0; /* don't age */ 2351 switch (i) { 2352 case P2PADVERT_NETWORK: 2353 rrt->rrt_info.rip6_dest = ifac->ifac_addr; 2354 rrt->rrt_info.rip6_plen = ifac->ifac_plen; 2355 applyplen(&rrt->rrt_info.rip6_dest, 2356 ifac->ifac_plen); 2357 category = "network"; 2358 break; 2359 case P2PADVERT_ADDR: 2360 rrt->rrt_info.rip6_dest = ifac->ifac_addr; 2361 rrt->rrt_info.rip6_plen = 128; 2362 rrt->rrt_gw = in6addr_loopback; 2363 category = "addr"; 2364 break; 2365 case P2PADVERT_DEST: 2366 rrt->rrt_info.rip6_dest = ifac->ifac_raddr; 2367 rrt->rrt_info.rip6_plen = 128; 2368 rrt->rrt_gw = ifac->ifac_addr; 2369 category = "dest"; 2370 break; 2371 } 2372 if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) || 2373 IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) { 2374#if 0 2375 trace(1, "route: %s: skip unspec/linklocal " 2376 "(%s on %s)\n", category, ifcp->ifc_name); 2377#endif 2378 free(rrt); 2379 continue; 2380 } 2381 if ((advert & i) == 0) { 2382 rrt->rrt_rflags |= RRTF_NOADVERTISE; 2383 noadv = ", NO-ADV"; 2384 } else 2385 noadv = ""; 2386 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2387 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2388 np = &rrt->rrt_info; 2389 orrt = rtsearch(np); 2390 if (!orrt) { 2391 /* Attach the route to the list */ 2392 trace(1, "route: %s/%d: register route " 2393 "(%s on %s%s)\n", 2394 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2395 category, ifcp->ifc_name, noadv); 2396 TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next); 2397 } else if (rrt->rrt_index != orrt->rrt_index || 2398 rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) { 2399 /* replace route */ 2400 TAILQ_INSERT_BEFORE(orrt, rrt, rrt_next); 2401 TAILQ_REMOVE(&riprt_head, orrt, rrt_next); 2402 free(orrt); 2403 2404 trace(1, "route: %s/%d: update (%s on %s%s)\n", 2405 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2406 category, ifcp->ifc_name, noadv); 2407 } else { 2408 /* Already found */ 2409 if (!again) { 2410 trace(1, "route: %s/%d: " 2411 "already registered (%s on %s%s)\n", 2412 inet6_n2p(&np->rip6_dest), 2413 np->rip6_plen, category, 2414 ifcp->ifc_name, noadv); 2415 } 2416 free(rrt); 2417 } 2418 } 2419 } 2420#undef P2PADVERT_NETWORK 2421#undef P2PADVERT_ADDR 2422#undef P2PADVERT_DEST 2423#undef P2PADVERT_MAX 2424} 2425 2426static int 2427getifmtu(int ifindex) 2428{ 2429 int mib[6]; 2430 char *buf; 2431 size_t msize; 2432 struct if_msghdr *ifm; 2433 int mtu; 2434 2435 mib[0] = CTL_NET; 2436 mib[1] = PF_ROUTE; 2437 mib[2] = 0; 2438 mib[3] = AF_INET6; 2439 mib[4] = NET_RT_IFLIST; 2440 mib[5] = ifindex; 2441 if (sysctl(mib, nitems(mib), NULL, &msize, NULL, 0) < 0) { 2442 fatal("sysctl estimate NET_RT_IFLIST"); 2443 /*NOTREACHED*/ 2444 } 2445 if ((buf = malloc(msize)) == NULL) { 2446 fatal("malloc"); 2447 /*NOTREACHED*/ 2448 } 2449 if (sysctl(mib, nitems(mib), buf, &msize, NULL, 0) < 0) { 2450 fatal("sysctl NET_RT_IFLIST"); 2451 /*NOTREACHED*/ 2452 } 2453 ifm = (struct if_msghdr *)(void *)buf; 2454 mtu = ifm->ifm_data.ifi_mtu; 2455 if (ifindex != ifm->ifm_index) { 2456 fatal("ifindex does not match with ifm_index"); 2457 /*NOTREACHED*/ 2458 } 2459 free(buf); 2460 return mtu; 2461} 2462 2463static const char * 2464rttypes(struct rt_msghdr *rtm) 2465{ 2466#define RTTYPE(s, f) \ 2467do { \ 2468 if (rtm->rtm_type == (f)) \ 2469 return (s); \ 2470} while (0) 2471 RTTYPE("ADD", RTM_ADD); 2472 RTTYPE("DELETE", RTM_DELETE); 2473 RTTYPE("CHANGE", RTM_CHANGE); 2474 RTTYPE("GET", RTM_GET); 2475 RTTYPE("LOSING", RTM_LOSING); 2476 RTTYPE("REDIRECT", RTM_REDIRECT); 2477 RTTYPE("MISS", RTM_MISS); 2478 RTTYPE("LOCK", RTM_LOCK); 2479 RTTYPE("NEWADDR", RTM_NEWADDR); 2480 RTTYPE("DELADDR", RTM_DELADDR); 2481 RTTYPE("IFINFO", RTM_IFINFO); 2482#ifdef RTM_OIFINFO 2483 RTTYPE("OIFINFO", RTM_OIFINFO); 2484#endif 2485#ifdef RTM_IFANNOUNCE 2486 RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE); 2487#endif 2488#ifdef RTM_NEWMADDR 2489 RTTYPE("NEWMADDR", RTM_NEWMADDR); 2490#endif 2491#ifdef RTM_DELMADDR 2492 RTTYPE("DELMADDR", RTM_DELMADDR); 2493#endif 2494#undef RTTYPE 2495 return NULL; 2496} 2497 2498static const char * 2499rtflags(struct rt_msghdr *rtm) 2500{ 2501 static char buf[BUFSIZ]; 2502 2503 /* 2504 * letter conflict should be okay. painful when *BSD diverges... 2505 */ 2506 strlcpy(buf, "", sizeof(buf)); 2507#define RTFLAG(s, f) \ 2508do { \ 2509 if (rtm->rtm_flags & (f)) \ 2510 strlcat(buf, (s), sizeof(buf)); \ 2511} while (0) 2512 RTFLAG("U", RTF_UP); 2513 RTFLAG("G", RTF_GATEWAY); 2514 RTFLAG("H", RTF_HOST); 2515 RTFLAG("R", RTF_REJECT); 2516 RTFLAG("D", RTF_DYNAMIC); 2517 RTFLAG("M", RTF_MODIFIED); 2518 RTFLAG("d", RTF_DONE); 2519#ifdef RTF_MASK 2520 RTFLAG("m", RTF_MASK); 2521#endif 2522#ifdef RTF_CLONED 2523 RTFLAG("c", RTF_CLONED); 2524#endif 2525 RTFLAG("X", RTF_XRESOLVE); 2526#ifdef RTF_LLINFO 2527 RTFLAG("L", RTF_LLINFO); 2528#endif 2529 RTFLAG("S", RTF_STATIC); 2530 RTFLAG("B", RTF_BLACKHOLE); 2531#ifdef RTF_PROTO3 2532 RTFLAG("3", RTF_PROTO3); 2533#endif 2534 RTFLAG("2", RTF_PROTO2); 2535 RTFLAG("1", RTF_PROTO1); 2536#ifdef RTF_BROADCAST 2537 RTFLAG("b", RTF_BROADCAST); 2538#endif 2539#ifdef RTF_DEFAULT 2540 RTFLAG("d", RTF_DEFAULT); 2541#endif 2542#ifdef RTF_ISAROUTER 2543 RTFLAG("r", RTF_ISAROUTER); 2544#endif 2545#ifdef RTF_TUNNEL 2546 RTFLAG("T", RTF_TUNNEL); 2547#endif 2548#ifdef RTF_AUTH 2549 RTFLAG("A", RTF_AUTH); 2550#endif 2551#ifdef RTF_CRYPT 2552 RTFLAG("E", RTF_CRYPT); 2553#endif 2554#undef RTFLAG 2555 return buf; 2556} 2557 2558static const char * 2559ifflags(int flags) 2560{ 2561 static char buf[BUFSIZ]; 2562 2563 strlcpy(buf, "", sizeof(buf)); 2564#define IFFLAG(s, f) \ 2565do { \ 2566 if (flags & (f)) { \ 2567 if (buf[0]) \ 2568 strlcat(buf, ",", sizeof(buf)); \ 2569 strlcat(buf, (s), sizeof(buf)); \ 2570 } \ 2571} while (0) 2572 IFFLAG("UP", IFF_UP); 2573 IFFLAG("BROADCAST", IFF_BROADCAST); 2574 IFFLAG("DEBUG", IFF_DEBUG); 2575 IFFLAG("LOOPBACK", IFF_LOOPBACK); 2576 IFFLAG("POINTOPOINT", IFF_POINTOPOINT); 2577#ifdef IFF_NOTRAILERS 2578 IFFLAG("NOTRAILERS", IFF_NOTRAILERS); 2579#endif 2580 IFFLAG("RUNNING", IFF_RUNNING); 2581 IFFLAG("NOARP", IFF_NOARP); 2582 IFFLAG("PROMISC", IFF_PROMISC); 2583 IFFLAG("ALLMULTI", IFF_ALLMULTI); 2584 IFFLAG("OACTIVE", IFF_OACTIVE); 2585 IFFLAG("SIMPLEX", IFF_SIMPLEX); 2586 IFFLAG("LINK0", IFF_LINK0); 2587 IFFLAG("LINK1", IFF_LINK1); 2588 IFFLAG("LINK2", IFF_LINK2); 2589 IFFLAG("MULTICAST", IFF_MULTICAST); 2590#undef IFFLAG 2591 return buf; 2592} 2593 2594static void 2595krtread(int again) 2596{ 2597 int mib[6]; 2598 size_t msize; 2599 char *buf, *p, *lim; 2600 struct rt_msghdr *rtm; 2601 int retry; 2602 const char *errmsg; 2603 2604 retry = 0; 2605 buf = NULL; 2606 mib[0] = CTL_NET; 2607 mib[1] = PF_ROUTE; 2608 mib[2] = 0; 2609 mib[3] = AF_INET6; /* Address family */ 2610 mib[4] = NET_RT_DUMP; /* Dump the kernel routing table */ 2611 mib[5] = 0; /* No flags */ 2612 do { 2613 if (retry) 2614 sleep(1); 2615 retry++; 2616 errmsg = NULL; 2617 if (buf) { 2618 free(buf); 2619 buf = NULL; 2620 } 2621 if (sysctl(mib, nitems(mib), NULL, &msize, NULL, 0) < 0) { 2622 errmsg = "sysctl estimate"; 2623 continue; 2624 } 2625 if ((buf = malloc(msize)) == NULL) { 2626 errmsg = "malloc"; 2627 continue; 2628 } 2629 if (sysctl(mib, nitems(mib), buf, &msize, NULL, 0) < 0) { 2630 errmsg = "sysctl NET_RT_DUMP"; 2631 continue; 2632 } 2633 } while (retry < RT_DUMP_MAXRETRY && errmsg != NULL); 2634 if (errmsg) { 2635 fatal("%s (with %d retries, msize=%lu)", errmsg, retry, 2636 (u_long)msize); 2637 /*NOTREACHED*/ 2638 } else if (1 < retry) 2639 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry); 2640 2641 lim = buf + msize; 2642 for (p = buf; p < lim; p += rtm->rtm_msglen) { 2643 rtm = (struct rt_msghdr *)(void *)p; 2644 rt_entry(rtm, again); 2645 } 2646 free(buf); 2647} 2648 2649static void 2650rt_entry(struct rt_msghdr *rtm, int again) 2651{ 2652 struct sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask; 2653 struct sockaddr_in6 *sin6_genmask, *sin6_ifp; 2654 char *rtmp, *ifname = NULL; 2655 struct riprt *rrt, *orrt; 2656 struct netinfo6 *np; 2657 int ifindex; 2658 2659 sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0; 2660 if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags & 2661 (RTF_XRESOLVE|RTF_BLACKHOLE)) { 2662 return; /* not interested in the link route */ 2663 } 2664 /* do not look at cloned routes */ 2665#ifdef RTF_WASCLONED 2666 if (rtm->rtm_flags & RTF_WASCLONED) 2667 return; 2668#endif 2669#ifdef RTF_CLONED 2670 if (rtm->rtm_flags & RTF_CLONED) 2671 return; 2672#endif 2673 /* XXX: Ignore connected routes. */ 2674 if (!(rtm->rtm_flags & (RTF_GATEWAY|RTF_HOST|RTF_STATIC))) 2675 return; 2676 /* 2677 * do not look at dynamic routes. 2678 * netbsd/openbsd cloned routes have UGHD. 2679 */ 2680 if (rtm->rtm_flags & RTF_DYNAMIC) 2681 return; 2682 rtmp = (char *)(rtm + 1); 2683 /* Destination */ 2684 if ((rtm->rtm_addrs & RTA_DST) == 0) 2685 return; /* ignore routes without destination address */ 2686 sin6_dst = (struct sockaddr_in6 *)(void *)rtmp; 2687 rtmp += ROUNDUP(sin6_dst->sin6_len); 2688 if (rtm->rtm_addrs & RTA_GATEWAY) { 2689 sin6_gw = (struct sockaddr_in6 *)(void *)rtmp; 2690 rtmp += ROUNDUP(sin6_gw->sin6_len); 2691 } 2692 if (rtm->rtm_addrs & RTA_NETMASK) { 2693 sin6_mask = (struct sockaddr_in6 *)(void *)rtmp; 2694 rtmp += ROUNDUP(sin6_mask->sin6_len); 2695 } 2696 if (rtm->rtm_addrs & RTA_GENMASK) { 2697 sin6_genmask = (struct sockaddr_in6 *)(void *)rtmp; 2698 rtmp += ROUNDUP(sin6_genmask->sin6_len); 2699 } 2700 if (rtm->rtm_addrs & RTA_IFP) { 2701 sin6_ifp = (struct sockaddr_in6 *)(void *)rtmp; 2702 rtmp += ROUNDUP(sin6_ifp->sin6_len); 2703 } 2704 2705 /* Destination */ 2706 if (sin6_dst->sin6_family != AF_INET6) 2707 return; 2708 if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr)) 2709 return; /* Link-local */ 2710 if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback)) 2711 return; /* Loopback */ 2712 if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr)) 2713 return; 2714 2715 if ((rrt = MALLOC(struct riprt)) == NULL) { 2716 fatal("malloc: struct riprt"); 2717 /*NOTREACHED*/ 2718 } 2719 memset(rrt, 0, sizeof(*rrt)); 2720 np = &rrt->rrt_info; 2721 rrt->rrt_same = NULL; 2722 rrt->rrt_t = time(NULL); 2723 if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC)) 2724 rrt->rrt_t = 0; /* Don't age static routes */ 2725 if (rtm->rtm_flags & Pflag) 2726 rrt->rrt_t = 0; /* Don't age PROTO[123] routes */ 2727 if ((rtm->rtm_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST) 2728 rrt->rrt_t = 0; /* Don't age non-gateway host routes */ 2729 np->rip6_tag = 0; 2730 np->rip6_metric = rtm->rtm_rmx.rmx_hopcount; 2731 if (np->rip6_metric < 1) 2732 np->rip6_metric = 1; 2733 rrt->rrt_flags = rtm->rtm_flags; 2734 np->rip6_dest = sin6_dst->sin6_addr; 2735 2736 /* Mask or plen */ 2737 if (rtm->rtm_flags & RTF_HOST) 2738 np->rip6_plen = 128; /* Host route */ 2739 else if (sin6_mask) 2740 np->rip6_plen = sin6mask2len(sin6_mask); 2741 else 2742 np->rip6_plen = 0; 2743 2744 orrt = rtsearch(np); 2745 if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) { 2746 /* Already found */ 2747 if (!again) { 2748 trace(1, "route: %s/%d flags %s: already registered\n", 2749 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2750 rtflags(rtm)); 2751 } 2752 free(rrt); 2753 return; 2754 } 2755 /* Gateway */ 2756 if (!sin6_gw) 2757 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2758 else { 2759 if (sin6_gw->sin6_family == AF_INET6) 2760 rrt->rrt_gw = sin6_gw->sin6_addr; 2761 else if (sin6_gw->sin6_family == AF_LINK) { 2762 /* XXX in case ppp link? */ 2763 rrt->rrt_gw = in6addr_loopback; 2764 } else 2765 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2766 } 2767 trace(1, "route: %s/%d flags %s", 2768 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm)); 2769 trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw)); 2770 2771 /* Interface */ 2772 ifindex = rtm->rtm_index; 2773 if ((unsigned int)ifindex < nindex2ifc && index2ifc[ifindex]) 2774 ifname = index2ifc[ifindex]->ifc_name; 2775 else { 2776 trace(1, " not configured\n"); 2777 free(rrt); 2778 return; 2779 } 2780 trace(1, " if %s sock %d", ifname, ifindex); 2781 rrt->rrt_index = ifindex; 2782 2783 trace(1, "\n"); 2784 2785 /* Check gateway */ 2786 if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) && 2787 !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw) && 2788 (rrt->rrt_flags & RTF_LOCAL) == 0) { 2789 trace(0, "***** Gateway %s is not a link-local address.\n", 2790 inet6_n2p(&rrt->rrt_gw)); 2791 trace(0, "***** dest(%s) if(%s) -- Not optimized.\n", 2792 inet6_n2p(&rrt->rrt_info.rip6_dest), ifname); 2793 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR; 2794 } 2795 2796 /* Put it to the route list */ 2797 if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) { 2798 /* replace route list */ 2799 TAILQ_INSERT_BEFORE(orrt, rrt, rrt_next); 2800 TAILQ_REMOVE(&riprt_head, orrt, rrt_next); 2801 2802 trace(1, "route: %s/%d flags %s: replace new route\n", 2803 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2804 rtflags(rtm)); 2805 free(orrt); 2806 } else 2807 TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next); 2808} 2809 2810static int 2811addroute(struct riprt *rrt, 2812 const struct in6_addr *gw, 2813 struct ifc *ifcp) 2814{ 2815 struct netinfo6 *np; 2816 u_char buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ]; 2817 struct rt_msghdr *rtm; 2818 struct sockaddr_in6 *sin6; 2819 int len; 2820 2821 np = &rrt->rrt_info; 2822 inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1)); 2823 inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2)); 2824 tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n", 2825 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2826 np->rip6_metric - 1, buf2); 2827 if (rtlog) 2828 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(), 2829 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2830 np->rip6_metric - 1, buf2); 2831 if (nflag) 2832 return 0; 2833 2834 memset(buf, 0, sizeof(buf)); 2835 rtm = (struct rt_msghdr *)(void *)buf; 2836 rtm->rtm_type = RTM_ADD; 2837 rtm->rtm_version = RTM_VERSION; 2838 rtm->rtm_seq = ++seq; 2839 rtm->rtm_pid = pid; 2840 rtm->rtm_flags = rrt->rrt_flags; 2841 rtm->rtm_flags |= Qflag; 2842 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2843 rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1; 2844 rtm->rtm_inits = RTV_HOPCOUNT; 2845 sin6 = (struct sockaddr_in6 *)(void *)&buf[sizeof(struct rt_msghdr)]; 2846 /* Destination */ 2847 sin6->sin6_len = sizeof(struct sockaddr_in6); 2848 sin6->sin6_family = AF_INET6; 2849 sin6->sin6_addr = np->rip6_dest; 2850 sin6 = (struct sockaddr_in6 *)(void *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2851 /* Gateway */ 2852 sin6->sin6_len = sizeof(struct sockaddr_in6); 2853 sin6->sin6_family = AF_INET6; 2854 sin6->sin6_addr = *gw; 2855 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 2856 sin6->sin6_scope_id = ifcp->ifc_index; 2857 sin6 = (struct sockaddr_in6 *)(void *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2858 /* Netmask */ 2859 sin6->sin6_len = sizeof(struct sockaddr_in6); 2860 sin6->sin6_family = AF_INET6; 2861 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2862 sin6 = (struct sockaddr_in6 *)(void *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2863 2864 len = (char *)sin6 - (char *)buf; 2865 rtm->rtm_msglen = len; 2866 if (write(rtsock, buf, len) > 0) 2867 return 0; 2868 2869 if (errno == EEXIST) { 2870 trace(0, "ADD: Route already exists %s/%d gw %s\n", 2871 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2872 if (rtlog) 2873 fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n", 2874 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2875 } else { 2876 trace(0, "Can not write to rtsock (addroute): %s\n", 2877 strerror(errno)); 2878 if (rtlog) 2879 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2880 strerror(errno)); 2881 } 2882 return -1; 2883} 2884 2885static int 2886delroute(struct netinfo6 *np, struct in6_addr *gw) 2887{ 2888 u_char buf[BUFSIZ], buf2[BUFSIZ]; 2889 struct rt_msghdr *rtm; 2890 struct sockaddr_in6 *sin6; 2891 int len; 2892 2893 inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2)); 2894 tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest), 2895 np->rip6_plen, buf2); 2896 if (rtlog) 2897 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n", 2898 hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2899 if (nflag) 2900 return 0; 2901 2902 memset(buf, 0, sizeof(buf)); 2903 rtm = (struct rt_msghdr *)(void *)buf; 2904 rtm->rtm_type = RTM_DELETE; 2905 rtm->rtm_version = RTM_VERSION; 2906 rtm->rtm_seq = ++seq; 2907 rtm->rtm_pid = pid; 2908 rtm->rtm_flags = RTF_UP | RTF_GATEWAY; 2909 rtm->rtm_flags |= Qflag; 2910 if (np->rip6_plen == sizeof(struct in6_addr) * 8) 2911 rtm->rtm_flags |= RTF_HOST; 2912 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2913 sin6 = (struct sockaddr_in6 *)(void *)&buf[sizeof(struct rt_msghdr)]; 2914 /* Destination */ 2915 sin6->sin6_len = sizeof(struct sockaddr_in6); 2916 sin6->sin6_family = AF_INET6; 2917 sin6->sin6_addr = np->rip6_dest; 2918 sin6 = (struct sockaddr_in6 *)(void *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2919 /* Gateway */ 2920 sin6->sin6_len = sizeof(struct sockaddr_in6); 2921 sin6->sin6_family = AF_INET6; 2922 sin6->sin6_addr = *gw; 2923 sin6 = (struct sockaddr_in6 *)(void *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2924 /* Netmask */ 2925 sin6->sin6_len = sizeof(struct sockaddr_in6); 2926 sin6->sin6_family = AF_INET6; 2927 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2928 sin6 = (struct sockaddr_in6 *)(void *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2929 2930 len = (char *)sin6 - (char *)buf; 2931 rtm->rtm_msglen = len; 2932 if (write(rtsock, buf, len) >= 0) 2933 return 0; 2934 2935 if (errno == ESRCH) { 2936 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n", 2937 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2938 if (rtlog) 2939 fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n", 2940 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2941 } else { 2942 trace(0, "Can not write to rtsock (delroute): %s\n", 2943 strerror(errno)); 2944 if (rtlog) 2945 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2946 strerror(errno)); 2947 } 2948 return -1; 2949} 2950 2951#if 0 2952static struct in6_addr * 2953getroute(struct netinfo6 *np, struct in6_addr *gw) 2954{ 2955 u_char buf[BUFSIZ]; 2956 int myseq; 2957 int len; 2958 struct rt_msghdr *rtm; 2959 struct sockaddr_in6 *sin6; 2960 2961 rtm = (struct rt_msghdr *)(void *)buf; 2962 len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6); 2963 memset(rtm, 0, len); 2964 rtm->rtm_type = RTM_GET; 2965 rtm->rtm_version = RTM_VERSION; 2966 myseq = ++seq; 2967 rtm->rtm_seq = myseq; 2968 rtm->rtm_addrs = RTA_DST; 2969 rtm->rtm_msglen = len; 2970 sin6 = (struct sockaddr_in6 *)(void *)&buf[sizeof(struct rt_msghdr)]; 2971 sin6->sin6_len = sizeof(struct sockaddr_in6); 2972 sin6->sin6_family = AF_INET6; 2973 sin6->sin6_addr = np->rip6_dest; 2974 if (write(rtsock, buf, len) < 0) { 2975 if (errno == ESRCH) /* No such route found */ 2976 return NULL; 2977 perror("write to rtsock"); 2978 exit(1); 2979 } 2980 do { 2981 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 2982 perror("read from rtsock"); 2983 exit(1); 2984 } 2985 rtm = (struct rt_msghdr *)(void *)buf; 2986 } while (rtm->rtm_type != RTM_GET || rtm->rtm_seq != myseq || 2987 rtm->rtm_pid != pid); 2988 sin6 = (struct sockaddr_in6 *)(void *)&buf[sizeof(struct rt_msghdr)]; 2989 if (rtm->rtm_addrs & RTA_DST) { 2990 sin6 = (struct sockaddr_in6 *)(void *) 2991 ((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2992 } 2993 if (rtm->rtm_addrs & RTA_GATEWAY) { 2994 *gw = sin6->sin6_addr; 2995 return gw; 2996 } 2997 return NULL; 2998} 2999#endif 3000 3001static const char * 3002inet6_n2p(const struct in6_addr *p) 3003{ 3004 static char buf[BUFSIZ]; 3005 3006 return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf)); 3007} 3008 3009static void 3010ifrtdump(int sig) 3011{ 3012 3013 ifdump(sig); 3014 rtdump(sig); 3015} 3016 3017static void 3018ifdump(int sig) 3019{ 3020 struct ifc *ifcp; 3021 FILE *dump; 3022 int nifc = 0; 3023 3024 if (sig == 0) 3025 dump = stderr; 3026 else 3027 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 3028 dump = stderr; 3029 3030 fprintf(dump, "%s: Interface Table Dump\n", hms()); 3031 TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) 3032 nifc++; 3033 fprintf(dump, " Number of interfaces: %d\n", nifc); 3034 3035 fprintf(dump, " advertising interfaces:\n"); 3036 TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) { 3037 if ((ifcp->ifc_flags & IFF_UP) == 0) 3038 continue; 3039 if (iff_find(ifcp, IFIL_TYPE_N) != NULL) 3040 continue; 3041 ifdump0(dump, ifcp); 3042 } 3043 fprintf(dump, "\n"); 3044 fprintf(dump, " non-advertising interfaces:\n"); 3045 TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) { 3046 if ((ifcp->ifc_flags & IFF_UP) && 3047 (iff_find(ifcp, IFIL_TYPE_N) == NULL)) 3048 continue; 3049 ifdump0(dump, ifcp); 3050 } 3051 fprintf(dump, "\n"); 3052 if (dump != stderr) 3053 fclose(dump); 3054} 3055 3056static void 3057ifdump0(FILE *dump, const struct ifc *ifcp) 3058{ 3059 struct ifac *ifac; 3060 struct iff *iffp; 3061 char buf[BUFSIZ]; 3062 const char *ft; 3063 int addr; 3064 3065 fprintf(dump, " %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n", 3066 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags), 3067 inet6_n2p(&ifcp->ifc_mylladdr), 3068 ifcp->ifc_mtu, ifcp->ifc_metric); 3069 TAILQ_FOREACH(ifac, &ifcp->ifc_ifac_head, ifac_next) { 3070 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 3071 inet_ntop(AF_INET6, (void *)&ifac->ifac_raddr, 3072 buf, sizeof(buf)); 3073 fprintf(dump, "\t%s/%d -- %s\n", 3074 inet6_n2p(&ifac->ifac_addr), 3075 ifac->ifac_plen, buf); 3076 } else { 3077 fprintf(dump, "\t%s/%d\n", 3078 inet6_n2p(&ifac->ifac_addr), 3079 ifac->ifac_plen); 3080 } 3081 } 3082 3083 fprintf(dump, "\tFilter:\n"); 3084 TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) { 3085 addr = 0; 3086 switch (iffp->iff_type) { 3087 case IFIL_TYPE_A: 3088 ft = "Aggregate"; addr++; break; 3089 case IFIL_TYPE_N: 3090 ft = "No-use"; break; 3091 case IFIL_TYPE_O: 3092 ft = "Advertise-only"; addr++; break; 3093 case IFIL_TYPE_T: 3094 ft = "Default-only"; break; 3095 case IFIL_TYPE_L: 3096 ft = "Listen-only"; addr++; break; 3097 default: 3098 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type); 3099 ft = buf; 3100 addr++; 3101 break; 3102 } 3103 fprintf(dump, "\t\t%s", ft); 3104 if (addr) 3105 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr), 3106 iffp->iff_plen); 3107 fprintf(dump, "\n"); 3108 } 3109 fprintf(dump, "\n"); 3110} 3111 3112static void 3113rtdump(int sig) 3114{ 3115 struct riprt *rrt; 3116 char buf[BUFSIZ]; 3117 FILE *dump; 3118 time_t t, age; 3119 3120 if (sig == 0) 3121 dump = stderr; 3122 else 3123 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 3124 dump = stderr; 3125 3126 t = time(NULL); 3127 fprintf(dump, "\n%s: Routing Table Dump\n", hms()); 3128 TAILQ_FOREACH(rrt, &riprt_head, rrt_next) { 3129 if (rrt->rrt_t == 0) 3130 age = 0; 3131 else 3132 age = t - rrt->rrt_t; 3133 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest, 3134 buf, sizeof(buf)); 3135 fprintf(dump, " %s/%d if(%d:%s) gw(%s) [%d] age(%ld)", 3136 buf, rrt->rrt_info.rip6_plen, rrt->rrt_index, 3137 index2ifc[rrt->rrt_index]->ifc_name, 3138 inet6_n2p(&rrt->rrt_gw), 3139 rrt->rrt_info.rip6_metric, (long)age); 3140 if (rrt->rrt_info.rip6_tag) { 3141 fprintf(dump, " tag(0x%04x)", 3142 ntohs(rrt->rrt_info.rip6_tag) & 0xffff); 3143 } 3144 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) 3145 fprintf(dump, " NOT-LL"); 3146 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 3147 fprintf(dump, " NO-ADV"); 3148 fprintf(dump, "\n"); 3149 } 3150 fprintf(dump, "\n"); 3151 if (dump != stderr) 3152 fclose(dump); 3153} 3154 3155/* 3156 * Parse the -A (and -O) options and put corresponding filter object to the 3157 * specified interface structures. Each of the -A/O option has the following 3158 * syntax: -A 5f09:c400::/32,ef0,ef1 (aggregate) 3159 * -O 5f09:c400::/32,ef0,ef1 (only when match) 3160 */ 3161static void 3162filterconfig(void) 3163{ 3164 int i; 3165 char *p, *ap, *iflp, *ifname, *ep; 3166 struct iff iff, *iffp; 3167 struct ifc *ifcp; 3168 struct riprt *rrt; 3169#if 0 3170 struct in6_addr gw; 3171#endif 3172 u_long plen; 3173 3174 for (i = 0; i < nfilter; i++) { 3175 ap = filter[i]; 3176 iflp = NULL; 3177 iffp = ⇔ 3178 memset(iffp, 0, sizeof(*iffp)); 3179 if (filtertype[i] == 'N' || filtertype[i] == 'T') { 3180 iflp = ap; 3181 goto ifonly; 3182 } 3183 if ((p = strchr(ap, ',')) != NULL) { 3184 *p++ = '\0'; 3185 iflp = p; 3186 } 3187 if ((p = strchr(ap, '/')) == NULL) { 3188 fatal("no prefixlen specified for '%s'", ap); 3189 /*NOTREACHED*/ 3190 } 3191 *p++ = '\0'; 3192 if (inet_pton(AF_INET6, ap, &iffp->iff_addr) != 1) { 3193 fatal("invalid prefix specified for '%s'", ap); 3194 /*NOTREACHED*/ 3195 } 3196 errno = 0; 3197 ep = NULL; 3198 plen = strtoul(p, &ep, 10); 3199 if (errno || !*p || *ep || plen > sizeof(iffp->iff_addr) * 8) { 3200 fatal("invalid prefix length specified for '%s'", ap); 3201 /*NOTREACHED*/ 3202 } 3203 iffp->iff_plen = plen; 3204 applyplen(&iffp->iff_addr, iffp->iff_plen); 3205ifonly: 3206 iffp->iff_type = filtertype[i]; 3207 if (iflp == NULL || *iflp == '\0') { 3208 fatal("no interface specified for '%s'", ap); 3209 /*NOTREACHED*/ 3210 } 3211 /* parse the interface listing portion */ 3212 while (iflp) { 3213 ifname = iflp; 3214 if ((iflp = strchr(iflp, ',')) != NULL) 3215 *iflp++ = '\0'; 3216 3217 TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) { 3218 if (fnmatch(ifname, ifcp->ifc_name, 0) != 0) 3219 continue; 3220 3221 iffp = malloc(sizeof(*iffp)); 3222 if (iffp == NULL) { 3223 fatal("malloc of iff"); 3224 /*NOTREACHED*/ 3225 } 3226 memcpy(iffp, &iff, sizeof(*iffp)); 3227#if 0 3228 syslog(LOG_INFO, "Add filter: type %d, ifname %s.", iffp->iff_type, ifname); 3229#endif 3230 TAILQ_INSERT_HEAD(&ifcp->ifc_iff_head, iffp, iff_next); 3231 } 3232 } 3233 3234 /* 3235 * -A: aggregate configuration. 3236 */ 3237 if (filtertype[i] != IFIL_TYPE_A) 3238 continue; 3239 /* put the aggregate to the kernel routing table */ 3240 rrt = (struct riprt *)malloc(sizeof(struct riprt)); 3241 if (rrt == NULL) { 3242 fatal("malloc: rrt"); 3243 /*NOTREACHED*/ 3244 } 3245 memset(rrt, 0, sizeof(struct riprt)); 3246 rrt->rrt_info.rip6_dest = iff.iff_addr; 3247 rrt->rrt_info.rip6_plen = iff.iff_plen; 3248 rrt->rrt_info.rip6_metric = 1; 3249 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 3250 rrt->rrt_gw = in6addr_loopback; 3251 rrt->rrt_flags = RTF_UP | RTF_REJECT; 3252 rrt->rrt_rflags = RRTF_AGGREGATE; 3253 rrt->rrt_t = 0; 3254 rrt->rrt_index = loopifcp->ifc_index; 3255#if 0 3256 if (getroute(&rrt->rrt_info, &gw)) { 3257#if 0 3258 /* 3259 * When the address has already been registered in the 3260 * kernel routing table, it should be removed 3261 */ 3262 delroute(&rrt->rrt_info, &gw); 3263#else 3264 /* it is safer behavior */ 3265 errno = EINVAL; 3266 fatal("%s/%u already in routing table, " 3267 "cannot aggregate", 3268 inet6_n2p(&rrt->rrt_info.rip6_dest), 3269 rrt->rrt_info.rip6_plen); 3270 /*NOTREACHED*/ 3271#endif 3272 } 3273#endif 3274 /* Put the route to the list */ 3275 TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next); 3276 trace(1, "Aggregate: %s/%d for %s\n", 3277 inet6_n2p(&iff.iff_addr), iff.iff_plen, 3278 loopifcp->ifc_name); 3279 /* Add this route to the kernel */ 3280 if (nflag) /* do not modify kernel routing table */ 3281 continue; 3282 addroute(rrt, &in6addr_loopback, loopifcp); 3283 } 3284} 3285 3286/***************** utility functions *****************/ 3287 3288/* 3289 * Returns a pointer to ifac whose address and prefix length matches 3290 * with the address and prefix length specified in the arguments. 3291 */ 3292static struct ifac * 3293ifa_match(const struct ifc *ifcp, 3294 const struct in6_addr *ia, 3295 int plen) 3296{ 3297 struct ifac *ifac; 3298 3299 TAILQ_FOREACH(ifac, &ifcp->ifc_ifac_head, ifac_next) { 3300 if (IN6_ARE_ADDR_EQUAL(&ifac->ifac_addr, ia) && 3301 ifac->ifac_plen == plen) 3302 break; 3303 } 3304 3305 return (ifac); 3306} 3307 3308/* 3309 * Return a pointer to riprt structure whose address and prefix length 3310 * matches with the address and prefix length found in the argument. 3311 * Note: This is not a rtalloc(). Therefore exact match is necessary. 3312 */ 3313static struct riprt * 3314rtsearch(struct netinfo6 *np) 3315{ 3316 struct riprt *rrt; 3317 3318 TAILQ_FOREACH(rrt, &riprt_head, rrt_next) { 3319 if (rrt->rrt_info.rip6_plen == np->rip6_plen && 3320 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 3321 &np->rip6_dest)) 3322 break; 3323 } 3324 3325 return (rrt); 3326} 3327 3328static int 3329sin6mask2len(const struct sockaddr_in6 *sin6) 3330{ 3331 3332 return mask2len(&sin6->sin6_addr, 3333 sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr)); 3334} 3335 3336static int 3337mask2len(const struct in6_addr *addr, int lenlim) 3338{ 3339 int i = 0, j; 3340 const u_char *p = (const u_char *)addr; 3341 3342 for (j = 0; j < lenlim; j++, p++) { 3343 if (*p != 0xff) 3344 break; 3345 i += 8; 3346 } 3347 if (j < lenlim) { 3348 switch (*p) { 3349#define MASKLEN(m, l) case m: do { i += l; break; } while (0) 3350 MASKLEN(0xfe, 7); break; 3351 MASKLEN(0xfc, 6); break; 3352 MASKLEN(0xf8, 5); break; 3353 MASKLEN(0xf0, 4); break; 3354 MASKLEN(0xe0, 3); break; 3355 MASKLEN(0xc0, 2); break; 3356 MASKLEN(0x80, 1); break; 3357#undef MASKLEN 3358 } 3359 } 3360 return i; 3361} 3362 3363static const u_char plent[8] = { 3364 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe 3365}; 3366 3367static void 3368applyplen(struct in6_addr *ia, int plen) 3369{ 3370 u_char *p; 3371 int i; 3372 3373 p = ia->s6_addr; 3374 for (i = 0; i < 16; i++) { 3375 if (plen <= 0) 3376 *p = 0; 3377 else if (plen < 8) 3378 *p &= plent[plen]; 3379 p++, plen -= 8; 3380 } 3381} 3382 3383static const int pl2m[9] = { 3384 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff 3385}; 3386 3387static struct in6_addr * 3388plen2mask(int n) 3389{ 3390 static struct in6_addr ia; 3391 u_char *p; 3392 int i; 3393 3394 memset(&ia, 0, sizeof(struct in6_addr)); 3395 p = (u_char *)&ia; 3396 for (i = 0; i < 16; i++, p++, n -= 8) { 3397 if (n >= 8) { 3398 *p = 0xff; 3399 continue; 3400 } 3401 *p = pl2m[n]; 3402 break; 3403 } 3404 return &ia; 3405} 3406 3407static char * 3408allocopy(char *p) 3409{ 3410 int len = strlen(p) + 1; 3411 char *q = (char *)malloc(len); 3412 3413 if (!q) { 3414 fatal("malloc"); 3415 /*NOTREACHED*/ 3416 } 3417 3418 strlcpy(q, p, len); 3419 return q; 3420} 3421 3422static char * 3423hms(void) 3424{ 3425 static char buf[BUFSIZ]; 3426 time_t t; 3427 struct tm *tm; 3428 3429 t = time(NULL); 3430 if ((tm = localtime(&t)) == 0) { 3431 fatal("localtime"); 3432 /*NOTREACHED*/ 3433 } 3434 snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min, 3435 tm->tm_sec); 3436 return buf; 3437} 3438 3439#define RIPRANDDEV 1.0 /* 30 +- 15, max - min = 30 */ 3440 3441static int 3442ripinterval(int timer) 3443{ 3444 double r = rand(); 3445 3446 interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5)); 3447 nextalarm = time(NULL) + interval; 3448 return interval; 3449} 3450 3451#if 0 3452static time_t 3453ripsuptrig(void) 3454{ 3455 time_t t; 3456 3457 double r = rand(); 3458 t = (int)(RIP_TRIG_INT6_MIN + 3459 (RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX)); 3460 sup_trig_update = time(NULL) + t; 3461 return t; 3462} 3463#endif 3464 3465static void 3466fatal(const char *fmt, ...) 3467{ 3468 va_list ap; 3469 char buf[1024]; 3470 3471 va_start(ap, fmt); 3472 vsnprintf(buf, sizeof(buf), fmt, ap); 3473 va_end(ap); 3474 perror(buf); 3475 if (errno) 3476 syslog(LOG_ERR, "%s: %s", buf, strerror(errno)); 3477 else 3478 syslog(LOG_ERR, "%s", buf); 3479 rtdexit(); 3480} 3481 3482static void 3483tracet(int level, const char *fmt, ...) 3484{ 3485 va_list ap; 3486 3487 if (level <= dflag) { 3488 va_start(ap, fmt); 3489 fprintf(stderr, "%s: ", hms()); 3490 vfprintf(stderr, fmt, ap); 3491 va_end(ap); 3492 } 3493 if (dflag) { 3494 va_start(ap, fmt); 3495 if (level > 0) 3496 vsyslog(LOG_DEBUG, fmt, ap); 3497 else 3498 vsyslog(LOG_WARNING, fmt, ap); 3499 va_end(ap); 3500 } 3501} 3502 3503static void 3504trace(int level, const char *fmt, ...) 3505{ 3506 va_list ap; 3507 3508 if (level <= dflag) { 3509 va_start(ap, fmt); 3510 vfprintf(stderr, fmt, ap); 3511 va_end(ap); 3512 } 3513 if (dflag) { 3514 va_start(ap, fmt); 3515 if (level > 0) 3516 vsyslog(LOG_DEBUG, fmt, ap); 3517 else 3518 vsyslog(LOG_WARNING, fmt, ap); 3519 va_end(ap); 3520 } 3521} 3522 3523static struct ifc * 3524ifc_find(char *name) 3525{ 3526 struct ifc *ifcp; 3527 3528 TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) { 3529 if (strcmp(name, ifcp->ifc_name) == 0) 3530 break; 3531 } 3532 return (ifcp); 3533} 3534 3535static struct iff * 3536iff_find(struct ifc *ifcp, int type) 3537{ 3538 struct iff *iffp; 3539 3540 TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) { 3541 if (type == IFIL_TYPE_ANY || 3542 type == iffp->iff_type) 3543 break; 3544 } 3545 3546 return (iffp); 3547} 3548 3549static void 3550setindex2ifc(int idx, struct ifc *ifcp) 3551{ 3552 int n, nsize; 3553 struct ifc **p; 3554 3555 if (!index2ifc) { 3556 nindex2ifc = 5; /*initial guess*/ 3557 index2ifc = (struct ifc **) 3558 malloc(sizeof(*index2ifc) * nindex2ifc); 3559 if (index2ifc == NULL) { 3560 fatal("malloc"); 3561 /*NOTREACHED*/ 3562 } 3563 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc); 3564 } 3565 n = nindex2ifc; 3566 for (nsize = nindex2ifc; nsize <= idx; nsize *= 2) 3567 ; 3568 if (n != nsize) { 3569 p = (struct ifc **)realloc(index2ifc, 3570 sizeof(*index2ifc) * nsize); 3571 if (p == NULL) { 3572 fatal("realloc"); 3573 /*NOTREACHED*/ 3574 } 3575 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n)); 3576 index2ifc = p; 3577 nindex2ifc = nsize; 3578 } 3579 index2ifc[idx] = ifcp; 3580} 3581