route6d.c revision 1.71
1 /* $NetBSD: route6d.c,v 1.71 2018/05/09 07:30:21 maxv Exp $ */ 2 /* $KAME: route6d.c,v 1.94 2002/10/26 20:08:55 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 #ifndef lint 35 __RCSID("$NetBSD: route6d.c,v 1.71 2018/05/09 07:30:21 maxv Exp $"); 36 #endif 37 38 #include <stdbool.h> 39 #include <stdio.h> 40 41 #include <time.h> 42 #include <unistd.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <signal.h> 46 #include <stdarg.h> 47 #include <syslog.h> 48 #include <stddef.h> 49 #include <errno.h> 50 #include <err.h> 51 #include <util.h> 52 #include <poll.h> 53 54 #include <sys/types.h> 55 #include <sys/param.h> 56 #include <sys/file.h> 57 #include <sys/socket.h> 58 #include <sys/ioctl.h> 59 #include <sys/sysctl.h> 60 #include <sys/uio.h> 61 #include <net/if.h> 62 #include <net/route.h> 63 #include <netinet/in.h> 64 #include <netinet/in_var.h> 65 #include <netinet/ip6.h> 66 #include <netinet/udp.h> 67 #include <netdb.h> 68 #include <ifaddrs.h> 69 70 #include <arpa/inet.h> 71 72 #include "route6d.h" 73 74 #define MAXFILTER 40 75 76 #ifdef DEBUG 77 #define INIT_INTERVAL6 6 78 #else 79 #define INIT_INTERVAL6 10 /* Wait to submit a initial riprequest */ 80 #endif 81 82 /* alignment constraint for routing socket */ 83 #if defined(RT_ROUNDUP) 84 #define ROUNDUP(a) RT_ROUNDUP(a) 85 #else 86 #define ROUNDUP(a) \ 87 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 88 #endif 89 90 /* 91 * Following two macros are highly depending on KAME Release 92 */ 93 #define IN6_LINKLOCAL_IFINDEX(addr) \ 94 ((addr).s6_addr[2] << 8 | (addr).s6_addr[3]) 95 96 #define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \ 97 do { \ 98 (addr).s6_addr[2] = ((index) >> 8) & 0xff; \ 99 (addr).s6_addr[3] = (index) & 0xff; \ 100 } while (0) 101 102 struct ifc { /* Configuration of an interface */ 103 char *ifc_name; /* if name */ 104 struct ifc *ifc_next; 105 int ifc_index; /* if index */ 106 int ifc_mtu; /* if mtu */ 107 int ifc_metric; /* if metric */ 108 u_int ifc_flags; /* flags */ 109 short ifc_cflags; /* IFC_XXX */ 110 struct in6_addr ifc_mylladdr; /* my link-local address */ 111 struct sockaddr_in6 ifc_ripsin; /* rip multicast address */ 112 struct iff *ifc_filter; /* filter structure */ 113 struct ifac *ifc_addr; /* list of AF_INET6 addresses */ 114 int ifc_joined; /* joined to ff02::9 */ 115 }; 116 117 struct ifac { /* Address associated to an interface */ 118 struct ifc *ifa_conf; /* back pointer */ 119 struct ifac *ifa_next; 120 struct in6_addr ifa_addr; /* address */ 121 struct in6_addr ifa_raddr; /* remote address, valid in p2p */ 122 int ifa_plen; /* prefix length */ 123 }; 124 125 struct iff { 126 int iff_type; 127 struct in6_addr iff_addr; 128 int iff_plen; 129 struct iff *iff_next; 130 }; 131 132 static struct ifc *ifc; 133 static int nifc; /* number of valid ifc's */ 134 static struct ifc **index2ifc; 135 static int nindex2ifc; 136 static struct ifc *loopifcp = NULL; /* pointing to loopback */ 137 static struct pollfd set[2]; 138 static int rtsock; /* the routing socket */ 139 static int ripsock; /* socket to send/receive RIP datagram */ 140 141 static struct rip6 *ripbuf; /* packet buffer for sending */ 142 143 /* 144 * Maintain the routes in a linked list. When the number of the routes 145 * grows, somebody would like to introduce a hash based or a radix tree 146 * based structure. I believe the number of routes handled by RIP is 147 * limited and I don't have to manage a complex data structure, however. 148 * 149 * One of the major drawbacks of the linear linked list is the difficulty 150 * of representing the relationship between a couple of routes. This may 151 * be a significant problem when we have to support route aggregation with 152 * supressing the specifices covered by the aggregate. 153 */ 154 155 struct riprt { 156 struct riprt *rrt_next; /* next destination */ 157 struct riprt *rrt_same; /* same destination - future use */ 158 struct netinfo6 rrt_info; /* network info */ 159 struct in6_addr rrt_gw; /* gateway */ 160 u_long rrt_flags; /* kernel routing table flags */ 161 u_long rrt_rflags; /* route6d routing table flags */ 162 time_t rrt_t; /* when the route validated */ 163 int rrt_index; /* ifindex from which this route got */ 164 }; 165 166 static struct riprt *riprt = 0; 167 168 static int dflag = 0; /* debug flag */ 169 static int qflag = 0; /* quiet flag */ 170 static int nflag = 0; /* don't update kernel routing table */ 171 static int aflag = 0; /* age out even the statically defined routes */ 172 static int hflag = 0; /* don't split horizon */ 173 static int lflag = 0; /* exchange site local routes */ 174 static int sflag = 0; /* announce static routes w/ split horizon */ 175 static int Sflag = 0; /* announce static routes to every interface */ 176 static unsigned long routetag = 0; /* route tag attached on originating case */ 177 178 static char *filter[MAXFILTER]; 179 static int filtertype[MAXFILTER]; 180 static int nfilter = 0; 181 182 static pid_t pid; 183 184 static struct sockaddr_storage ripsin; 185 186 static int interval = 1; 187 static time_t nextalarm = 0; 188 189 static FILE *rtlog = NULL; 190 191 static int logopened = 0; 192 193 static int seq = 0; 194 195 static volatile sig_atomic_t seenalrm; 196 static volatile sig_atomic_t seenquit; 197 static volatile sig_atomic_t seenusr1; 198 199 #define RRTF_AGGREGATE 0x08000000 200 #define RRTF_NOADVERTISE 0x10000000 201 #define RRTF_NH_NOT_LLADDR 0x20000000 202 #define RRTF_SENDANYWAY 0x40000000 203 #define RRTF_CHANGED 0x80000000 204 205 static void sighandler(int); 206 static void ripalarm(void); 207 static void riprecv(void); 208 static void ripsend(struct ifc *, struct sockaddr_in6 *, int); 209 static int out_filter(struct riprt *, struct ifc *); 210 static void init(void); 211 static void ifconfig(void); 212 static void ifconfig1(const char *, const struct sockaddr *, struct ifc *, int); 213 static void rtrecv(void); 214 static int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *, 215 const struct sockaddr_in6 *); 216 static int rt_deladdr(struct ifc *, const struct sockaddr_in6 *, 217 const struct sockaddr_in6 *); 218 static void filterconfig(void); 219 static int getifmtu(int); 220 static const char * 221 rttypes(struct rt_msghdr *); 222 static const char * 223 rtflags(struct rt_msghdr *); 224 static const char * 225 ifflags(int); 226 static int ifrt(struct ifc *, int); 227 static void ifrt_p2p(struct ifc *, int); 228 static void applyplen(struct in6_addr *, int); 229 static void ifrtdump(int); 230 static void ifdump(int); 231 static void ifdump0(FILE *, const struct ifc *); 232 static void rtdump(int); 233 static void rt_entry(struct rt_msghdr *, int); 234 static void rtdexit(void) __dead; 235 static void riprequest(struct ifc *, struct netinfo6 *, int, 236 struct sockaddr_in6 *); 237 static void ripflush(struct ifc *, struct sockaddr_in6 *); 238 static void sendrequest(struct ifc *); 239 static int sin6mask2len(const struct sockaddr_in6 *); 240 static int mask2len(const struct in6_addr *, int); 241 static int sendpacket(struct sockaddr_in6 *, int); 242 static int addroute(struct riprt *, const struct in6_addr *, struct ifc *); 243 static int delroute(struct netinfo6 *, struct in6_addr *); 244 static void krtread(int); 245 static int tobeadv(struct riprt *, struct ifc *); 246 static char * xstrdup(char *); 247 static char * hms(void); 248 static const char * 249 inet6_n2p(const struct in6_addr *); 250 static struct ifac * 251 ifa_match(const struct ifc *, const struct in6_addr *, int); 252 static struct in6_addr * 253 plen2mask(int); 254 static struct riprt * 255 rtsearch(struct netinfo6 *, struct riprt **); 256 static int ripinterval(int); 257 static void fatal(const char *, ...) __printflike(1, 2) __dead; 258 static void trace(int, const char *, ...) __printflike(2, 3); 259 static void tracet(int, const char *, ...) __printflike(2, 3); 260 static struct ifc * 261 ifc_find(char *); 262 static struct iff * 263 iff_find(struct ifc *, int); 264 static void setindex2ifc(int, struct ifc *); 265 266 #define MALLOC(type) (malloc(sizeof(type))) 267 268 int 269 main(int argc, char **argv) 270 { 271 int ch; 272 int error = 0; 273 struct ifc *ifcp; 274 sigset_t mask, omask; 275 char *progname; 276 char *ep; 277 278 progname = strrchr(*argv, '/'); 279 if (progname) 280 progname++; 281 else 282 progname = *argv; 283 284 pid = getpid(); 285 while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) { 286 switch (ch) { 287 case 'A': 288 case 'N': 289 case 'O': 290 case 'T': 291 case 'L': 292 if (nfilter >= MAXFILTER) { 293 fatal("Exceeds MAXFILTER"); 294 } 295 filtertype[nfilter] = ch; 296 filter[nfilter++] = xstrdup(optarg); 297 break; 298 case 't': 299 ep = NULL; 300 routetag = strtoul(optarg, &ep, 0); 301 if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) { 302 fatal("invalid route tag"); 303 } 304 break; 305 case 'R': 306 if ((rtlog = fopen(optarg, "w")) == NULL) { 307 fatal("Can not write to routelog"); 308 } 309 break; 310 #define FLAG(c, flag, n) case c: do { flag = n; break; } while(0) 311 FLAG('a', aflag, 1); break; 312 FLAG('d', dflag, 1); break; 313 FLAG('D', dflag, 2); break; 314 FLAG('h', hflag, 1); break; 315 FLAG('l', lflag, 1); break; 316 FLAG('n', nflag, 1); break; 317 FLAG('q', qflag, 1); break; 318 FLAG('s', sflag, 1); break; 319 FLAG('S', Sflag, 1); break; 320 #undef FLAG 321 default: 322 fatal("Invalid option specified, terminating"); 323 } 324 } 325 argc -= optind; 326 argv += optind; 327 if (argc > 0) { 328 fatal("bogus extra arguments"); 329 } 330 331 if (geteuid()) { 332 nflag = 1; 333 fprintf(stderr, "No kernel update is allowed\n"); 334 } 335 336 if (dflag == 0) { 337 if (daemon(0, 0) < 0) { 338 fatal("daemon"); 339 } 340 } 341 342 openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON); 343 logopened++; 344 345 if ((ripbuf = malloc(RIP6_MAXMTU)) == NULL) 346 fatal("malloc"); 347 memset(ripbuf, 0, RIP6_MAXMTU); 348 ripbuf->rip6_cmd = RIP6_RESPONSE; 349 ripbuf->rip6_vers = RIP6_VERSION; 350 ripbuf->rip6_res1[0] = 0; 351 ripbuf->rip6_res1[1] = 0; 352 353 init(); 354 ifconfig(); 355 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 356 if (ifcp->ifc_index < 0) { 357 fprintf(stderr, 358 "No ifindex found at %s (no link-local address?)\n", 359 ifcp->ifc_name); 360 error++; 361 } 362 } 363 if (error) 364 exit(1); 365 if (loopifcp == NULL) { 366 fatal("No loopback found"); 367 } 368 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 369 ifrt(ifcp, 0); 370 filterconfig(); 371 krtread(0); 372 if (dflag) 373 ifrtdump(0); 374 375 pidfile(NULL); 376 377 if ((ripbuf = malloc(RIP6_MAXMTU)) == NULL) { 378 fatal("malloc"); 379 } 380 memset(ripbuf, 0, RIP6_MAXMTU); 381 ripbuf->rip6_cmd = RIP6_RESPONSE; 382 ripbuf->rip6_vers = RIP6_VERSION; 383 ripbuf->rip6_res1[0] = 0; 384 ripbuf->rip6_res1[1] = 0; 385 386 if (signal(SIGALRM, sighandler) == SIG_ERR || 387 signal(SIGQUIT, sighandler) == SIG_ERR || 388 signal(SIGTERM, sighandler) == SIG_ERR || 389 signal(SIGUSR1, sighandler) == SIG_ERR || 390 signal(SIGHUP, sighandler) == SIG_ERR || 391 signal(SIGINT, sighandler) == SIG_ERR) { 392 fatal("signal"); 393 } 394 /* 395 * To avoid rip packet congestion (not on a cable but in this 396 * process), wait for a moment to send the first RIP6_RESPONSE 397 * packets. 398 */ 399 alarm(ripinterval(INIT_INTERVAL6)); 400 401 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 402 if (iff_find(ifcp, 'N')) 403 continue; 404 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 405 sendrequest(ifcp); 406 } 407 408 syslog(LOG_INFO, "**** Started ****"); 409 sigemptyset(&mask); 410 sigaddset(&mask, SIGALRM); 411 while (1) { 412 if (seenalrm) { 413 ripalarm(); 414 seenalrm = 0; 415 continue; 416 } 417 if (seenquit) { 418 rtdexit(); 419 seenquit = 0; 420 continue; 421 } 422 if (seenusr1) { 423 ifrtdump(SIGUSR1); 424 seenusr1 = 0; 425 continue; 426 } 427 428 switch (poll(set, 2, INFTIM)) 429 { 430 case -1: 431 if (errno != EINTR) { 432 fatal("poll"); 433 } 434 continue; 435 case 0: 436 continue; 437 default: 438 if (set[0].revents & POLLIN) 439 { 440 sigprocmask(SIG_BLOCK, &mask, &omask); 441 riprecv(); 442 sigprocmask(SIG_SETMASK, &omask, NULL); 443 } 444 if (set[1].revents & POLLIN) 445 { 446 sigprocmask(SIG_BLOCK, &mask, &omask); 447 rtrecv(); 448 sigprocmask(SIG_SETMASK, &omask, NULL); 449 } 450 } 451 } 452 } 453 454 static void 455 sighandler(int signo) 456 { 457 458 switch (signo) { 459 case SIGALRM: 460 seenalrm++; 461 break; 462 case SIGQUIT: 463 case SIGTERM: 464 seenquit++; 465 break; 466 case SIGUSR1: 467 case SIGHUP: 468 case SIGINT: 469 seenusr1++; 470 break; 471 } 472 } 473 474 /* 475 * gracefully exits after resetting sockopts. 476 */ 477 /* ARGSUSED */ 478 static void 479 rtdexit(void) 480 { 481 struct riprt *rrt; 482 483 alarm(0); 484 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 485 if (rrt->rrt_rflags & RRTF_AGGREGATE) { 486 delroute(&rrt->rrt_info, &rrt->rrt_gw); 487 } 488 } 489 close(ripsock); 490 close(rtsock); 491 syslog(LOG_INFO, "**** Terminated ****"); 492 closelog(); 493 exit(1); 494 } 495 496 /* 497 * Called periodically: 498 * 1. age out the learned route. remove it if necessary. 499 * 2. submit RIP6_RESPONSE packets. 500 * Invoked in every SUPPLY_INTERVAL6 (30) seconds. I believe we don't have 501 * to invoke this function in every 1 or 5 or 10 seconds only to age the 502 * routes more precisely. 503 */ 504 /* ARGSUSED */ 505 static void 506 ripalarm(void) 507 { 508 struct ifc *ifcp; 509 struct riprt *rrt, *rrt_prev, *rrt_next; 510 time_t t_lifetime, t_holddown; 511 512 /* age the RIP routes */ 513 rrt_prev = 0; 514 t_lifetime = time(NULL) - RIP_LIFETIME; 515 t_holddown = t_lifetime - RIP_HOLDDOWN; 516 for (rrt = riprt; rrt; rrt = rrt_next) { 517 rrt_next = rrt->rrt_next; 518 519 if (rrt->rrt_t == 0) { 520 rrt_prev = rrt; 521 continue; 522 } 523 if (rrt->rrt_t < t_holddown) { 524 if (rrt_prev) { 525 rrt_prev->rrt_next = rrt->rrt_next; 526 } else { 527 riprt = rrt->rrt_next; 528 } 529 delroute(&rrt->rrt_info, &rrt->rrt_gw); 530 free(rrt); 531 continue; 532 } 533 if (rrt->rrt_t < t_lifetime) 534 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 535 rrt_prev = rrt; 536 } 537 /* Supply updates */ 538 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 539 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 540 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 541 } 542 alarm(ripinterval(SUPPLY_INTERVAL6)); 543 } 544 545 static void 546 init(void) 547 { 548 int i, error; 549 const int int0 = 0, int1 = 1, int255 = 255; 550 struct addrinfo hints, *res; 551 char port[NI_MAXSERV]; 552 553 ifc = NULL; 554 nifc = 0; 555 nindex2ifc = 0; /*initial guess*/ 556 index2ifc = NULL; 557 snprintf(port, sizeof(port), "%u", RIP6_PORT); 558 559 memset(&hints, 0, sizeof(hints)); 560 hints.ai_family = PF_INET6; 561 hints.ai_socktype = SOCK_DGRAM; 562 hints.ai_flags = AI_PASSIVE; 563 error = getaddrinfo(NULL, port, &hints, &res); 564 if (error) { 565 fatal("%s", gai_strerror(error)); 566 } 567 if (res->ai_next) { 568 fatal(":: resolved to multiple address"); 569 } 570 571 ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 572 if (ripsock < 0) { 573 fatal("rip socket"); 574 } 575 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_V6ONLY, 576 &int1, sizeof(int1)) < 0) { 577 fatal("rip IPV6_V6ONLY"); 578 } 579 if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) { 580 fatal("rip bind"); 581 } 582 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 583 &int255, sizeof(int255)) < 0) { 584 fatal("rip IPV6_MULTICAST_HOPS"); 585 } 586 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, 587 &int0, sizeof(int0)) < 0) { 588 fatal("rip IPV6_MULTICAST_LOOP"); 589 } 590 591 i = 1; 592 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i, 593 sizeof(i)) < 0) { 594 fatal("rip IPV6_RECVPKTINFO"); 595 } 596 597 memset(&hints, 0, sizeof(hints)); 598 hints.ai_family = PF_INET6; 599 hints.ai_socktype = SOCK_DGRAM; 600 error = getaddrinfo(RIP6_DEST, port, &hints, &res); 601 if (error) { 602 fatal("%s", gai_strerror(error)); 603 } 604 if (res->ai_next) { 605 fatal("%s resolved to multiple address", RIP6_DEST); 606 } 607 memcpy(&ripsin, res->ai_addr, res->ai_addrlen); 608 609 set[0].fd = ripsock; 610 set[0].events = POLLIN; 611 612 if (nflag == 0) { 613 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) { 614 fatal("route socket"); 615 } 616 set[1].fd = rtsock; 617 set[1].events = POLLIN; 618 } else { 619 set[1].fd = -1; 620 } 621 } 622 623 #define RIPSIZE(n) \ 624 (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6)) 625 626 /* 627 * ripflush flushes the rip datagram stored in the rip buffer 628 */ 629 static int nrt; 630 static struct netinfo6 *nip; 631 632 static void 633 ripflush(struct ifc *ifcp, struct sockaddr_in6 *sin6) 634 { 635 int i; 636 int error; 637 638 if (ifcp) 639 tracet(1, "Send(%s): info(%d) to %s.%d\n", 640 ifcp->ifc_name, nrt, 641 inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port)); 642 else 643 tracet(1, "Send: info(%d) to %s.%d\n", 644 nrt, inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port)); 645 if (dflag >= 2) { 646 nip = ripbuf->rip6_nets; 647 for (i = 0; i < nrt; i++, nip++) { 648 if (nip->rip6_metric == NEXTHOP_METRIC) { 649 if (IN6_IS_ADDR_UNSPECIFIED(&nip->rip6_dest)) 650 trace(2, " NextHop reset"); 651 else { 652 trace(2, " NextHop %s", 653 inet6_n2p(&nip->rip6_dest)); 654 } 655 } else { 656 trace(2, " %s/%d[%d]", 657 inet6_n2p(&nip->rip6_dest), 658 nip->rip6_plen, nip->rip6_metric); 659 } 660 if (nip->rip6_tag) { 661 trace(2, " tag=0x%04x", 662 ntohs(nip->rip6_tag) & 0xffff); 663 } 664 trace(2, "\n"); 665 } 666 } 667 error = sendpacket(sin6, RIPSIZE(nrt)); 668 if (error == EAFNOSUPPORT && ifcp) { 669 /* Protocol not supported */ 670 tracet(1, "Could not send info to %s (%s): " 671 "set IFF_UP to 0\n", 672 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 673 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 674 } 675 nrt = 0; nip = ripbuf->rip6_nets; 676 } 677 678 /* 679 * Generate RIP6_RESPONSE packets and send them. 680 */ 681 static void 682 ripsend(struct ifc *ifcp, struct sockaddr_in6 *sin6, int flag) 683 { 684 struct riprt *rrt; 685 struct in6_addr *nh; /* next hop */ 686 int maxrte; 687 688 if (qflag) 689 return; 690 691 if (ifcp == NULL) { 692 /* 693 * Request from non-link local address is not 694 * a regular route6d update. 695 */ 696 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) - 697 sizeof(struct udphdr) - 698 sizeof(struct rip6) + sizeof(struct netinfo6)) / 699 sizeof(struct netinfo6); 700 nrt = 0; nip = ripbuf->rip6_nets; nh = NULL; 701 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 702 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 703 continue; 704 /* Put the route to the buffer */ 705 *nip = rrt->rrt_info; 706 nip++; nrt++; 707 if (nrt == maxrte) { 708 ripflush(NULL, sin6); 709 nh = NULL; 710 } 711 } 712 if (nrt) /* Send last packet */ 713 ripflush(NULL, sin6); 714 return; 715 } 716 717 if ((flag & RRTF_SENDANYWAY) == 0 && 718 (qflag || (ifcp->ifc_flags & IFF_LOOPBACK))) 719 return; 720 721 /* -N: no use */ 722 if (iff_find(ifcp, 'N') != NULL) 723 return; 724 725 /* -T: generate default route only */ 726 if (iff_find(ifcp, 'T') != NULL) { 727 struct netinfo6 rrt_info; 728 memset(&rrt_info, 0, sizeof(struct netinfo6)); 729 rrt_info.rip6_dest = in6addr_any; 730 rrt_info.rip6_plen = 0; 731 rrt_info.rip6_metric = 1; 732 rrt_info.rip6_metric += ifcp->ifc_metric; 733 rrt_info.rip6_tag = htons(routetag & 0xffff); 734 nip = ripbuf->rip6_nets; 735 *nip = rrt_info; 736 nrt = 1; 737 ripflush(ifcp, sin6); 738 return; 739 } 740 741 maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) - 742 sizeof(struct udphdr) - 743 sizeof(struct rip6) + sizeof(struct netinfo6)) / 744 sizeof(struct netinfo6); 745 746 nrt = 0; nip = ripbuf->rip6_nets; nh = NULL; 747 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 748 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 749 continue; 750 751 /* Need to check filter here */ 752 if (out_filter(rrt, ifcp) == 0) 753 continue; 754 755 /* Check split horizon and other conditions */ 756 if (tobeadv(rrt, ifcp) == 0) 757 continue; 758 759 /* Only considers the routes with flag if specified */ 760 if ((flag & RRTF_CHANGED) && 761 (rrt->rrt_rflags & RRTF_CHANGED) == 0) 762 continue; 763 764 /* Check nexthop */ 765 if (rrt->rrt_index == ifcp->ifc_index && 766 !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) && 767 (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) { 768 if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) { 769 if (nrt == maxrte - 2) 770 ripflush(ifcp, sin6); 771 nip->rip6_dest = rrt->rrt_gw; 772 if (IN6_IS_ADDR_LINKLOCAL(&nip->rip6_dest)) 773 SET_IN6_LINKLOCAL_IFINDEX(nip->rip6_dest, 0); 774 nip->rip6_plen = 0; 775 nip->rip6_tag = 0; 776 nip->rip6_metric = NEXTHOP_METRIC; 777 nh = &rrt->rrt_gw; 778 nip++; nrt++; 779 } 780 } else if (nh && (rrt->rrt_index != ifcp->ifc_index || 781 !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) || 782 rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) { 783 /* Reset nexthop */ 784 if (nrt == maxrte - 2) 785 ripflush(ifcp, sin6); 786 memset(nip, 0, sizeof(struct netinfo6)); 787 nip->rip6_metric = NEXTHOP_METRIC; 788 nh = NULL; 789 nip++; nrt++; 790 } 791 792 /* Put the route to the buffer */ 793 *nip = rrt->rrt_info; 794 nip++; nrt++; 795 if (nrt == maxrte) { 796 ripflush(ifcp, sin6); 797 nh = NULL; 798 } 799 } 800 if (nrt) /* Send last packet */ 801 ripflush(ifcp, sin6); 802 } 803 804 /* 805 * outbound filter logic, per-route/interface. 806 */ 807 static int 808 out_filter(struct riprt *rrt, struct ifc *ifcp) 809 { 810 struct iff *iffp; 811 struct in6_addr ia; 812 int ok; 813 814 /* 815 * -A: filter out less specific routes, if we have aggregated 816 * route configured. 817 */ 818 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 819 if (iffp->iff_type != 'A') 820 continue; 821 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen) 822 continue; 823 ia = rrt->rrt_info.rip6_dest; 824 applyplen(&ia, iffp->iff_plen); 825 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) 826 return 0; 827 } 828 829 /* 830 * if it is an aggregated route, advertise it only to the 831 * interfaces specified on -A. 832 */ 833 if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) { 834 ok = 0; 835 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 836 if (iffp->iff_type != 'A') 837 continue; 838 if (rrt->rrt_info.rip6_plen == iffp->iff_plen && 839 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 840 &iffp->iff_addr)) { 841 ok = 1; 842 break; 843 } 844 } 845 if (!ok) 846 return 0; 847 } 848 849 /* 850 * -O: advertise only if prefix matches the configured prefix. 851 */ 852 if (iff_find(ifcp, 'O')) { 853 ok = 0; 854 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 855 if (iffp->iff_type != 'O') 856 continue; 857 if (rrt->rrt_info.rip6_plen < iffp->iff_plen) 858 continue; 859 ia = rrt->rrt_info.rip6_dest; 860 applyplen(&ia, iffp->iff_plen); 861 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 862 ok = 1; 863 break; 864 } 865 } 866 if (!ok) 867 return 0; 868 } 869 870 /* the prefix should be advertised */ 871 return 1; 872 } 873 874 /* 875 * Determine if the route is to be advertised on the specified interface. 876 * It checks options specified in the arguments and the split horizon rule. 877 */ 878 static int 879 tobeadv(struct riprt *rrt, struct ifc *ifcp) 880 { 881 882 /* Special care for static routes */ 883 if (rrt->rrt_flags & RTF_STATIC) { 884 /* XXX don't advertise reject/blackhole routes */ 885 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE)) 886 return 0; 887 888 if (Sflag) /* Yes, advertise it anyway */ 889 return 1; 890 if (sflag && rrt->rrt_index != ifcp->ifc_index) 891 return 1; 892 return 0; 893 } 894 /* Regular split horizon */ 895 if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index) 896 return 0; 897 return 1; 898 } 899 900 /* 901 * Send a rip packet actually. 902 */ 903 static int 904 sendpacket(struct sockaddr_in6 *sin6, int len) 905 { 906 struct msghdr m; 907 struct cmsghdr *cm; 908 struct iovec iov[2]; 909 u_char cmsgbuf[256]; 910 struct in6_pktinfo *pi; 911 int idx; 912 struct sockaddr_in6 sincopy; 913 914 /* do not overwrite the given sin */ 915 sincopy = *sin6; 916 sin6 = &sincopy; 917 918 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) || 919 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 920 /* XXX: do not mix the interface index and link index */ 921 idx = IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr); 922 SET_IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr, 0); 923 sin6->sin6_scope_id = idx; 924 } else 925 idx = 0; 926 927 m.msg_name = (caddr_t)sin6; 928 m.msg_namelen = sizeof(*sin6); 929 iov[0].iov_base = (caddr_t)ripbuf; 930 iov[0].iov_len = len; 931 m.msg_iov = iov; 932 m.msg_iovlen = 1; 933 if (!idx) { 934 m.msg_control = NULL; 935 m.msg_controllen = 0; 936 } else { 937 memset(cmsgbuf, 0, sizeof(cmsgbuf)); 938 cm = (struct cmsghdr *)cmsgbuf; 939 m.msg_control = (caddr_t)cm; 940 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); 941 942 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 943 cm->cmsg_level = IPPROTO_IPV6; 944 cm->cmsg_type = IPV6_PKTINFO; 945 pi = (struct in6_pktinfo *)CMSG_DATA(cm); 946 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/ 947 pi->ipi6_ifindex = idx; 948 } 949 950 if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) { 951 trace(1, "sendmsg: %s\n", strerror(errno)); 952 return errno; 953 } 954 955 return 0; 956 } 957 958 /* 959 * Receive and process RIP packets. Update the routes/kernel forwarding 960 * table if necessary. 961 */ 962 static void 963 riprecv(void) 964 { 965 struct ifc *ifcp, *ic; 966 struct sockaddr_in6 fsock; 967 struct in6_addr nh; /* next hop */ 968 struct rip6 *rp; 969 struct netinfo6 *np, *nq; 970 struct riprt *rrt; 971 ssize_t len, nn; 972 unsigned int need_trigger, idx; 973 char buf[4 * RIP6_MAXMTU]; 974 time_t t; 975 struct msghdr m; 976 struct cmsghdr *cm; 977 struct iovec iov[2]; 978 u_char cmsgbuf[256]; 979 struct in6_pktinfo *pi; 980 struct iff *iffp; 981 struct in6_addr ia; 982 int ok; 983 time_t t_half_lifetime; 984 985 need_trigger = 0; 986 987 m.msg_name = (caddr_t)&fsock; 988 m.msg_namelen = sizeof(fsock); 989 iov[0].iov_base = (caddr_t)buf; 990 iov[0].iov_len = sizeof(buf); 991 m.msg_iov = iov; 992 m.msg_iovlen = 1; 993 cm = (struct cmsghdr *)cmsgbuf; 994 m.msg_control = (caddr_t)cm; 995 m.msg_controllen = sizeof(cmsgbuf); 996 if ((len = recvmsg(ripsock, &m, 0)) < 0) { 997 fatal("recvmsg"); 998 } 999 idx = 0; 1000 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m); 1001 cm; 1002 cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) { 1003 if (cm->cmsg_level == IPPROTO_IPV6 && 1004 cm->cmsg_type == IPV6_PKTINFO) { 1005 pi = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1006 idx = pi->ipi6_ifindex; 1007 break; 1008 } 1009 } 1010 if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) 1011 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx); 1012 1013 if (len < (int)sizeof(struct rip6)) { 1014 trace(1, "Packet too short\n"); 1015 return; 1016 } 1017 1018 nh = fsock.sin6_addr; 1019 nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) / 1020 sizeof(struct netinfo6); 1021 rp = (struct rip6 *)buf; 1022 np = rp->rip6_nets; 1023 1024 if (rp->rip6_vers != RIP6_VERSION) { 1025 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers); 1026 return; 1027 } 1028 if (rp->rip6_cmd == RIP6_REQUEST) { 1029 if (idx && idx < (unsigned)nindex2ifc) { 1030 ifcp = index2ifc[idx]; 1031 riprequest(ifcp, np, nn, &fsock); 1032 } else { 1033 riprequest(NULL, np, nn, &fsock); 1034 } 1035 return; 1036 } 1037 1038 if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) { 1039 trace(1, "Packets from non-ll addr: %s\n", 1040 inet6_n2p(&fsock.sin6_addr)); 1041 return; /* Ignore packets from non-link-local addr */ 1042 } 1043 idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr); 1044 ifcp = (idx < (unsigned)nindex2ifc) ? index2ifc[idx] : NULL; 1045 if (!ifcp) { 1046 trace(1, "Packets to unknown interface index %d\n", idx); 1047 return; /* Ignore it */ 1048 } 1049 if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr)) 1050 return; /* The packet is from me; ignore */ 1051 if (rp->rip6_cmd != RIP6_RESPONSE) { 1052 trace(1, "Invalid command %d\n", rp->rip6_cmd); 1053 return; 1054 } 1055 1056 /* -N: no use */ 1057 if (iff_find(ifcp, 'N') != NULL) 1058 return; 1059 1060 tracet(1, "Recv(%s): from %s.%d info(%d)\n", 1061 ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), (int)nn); 1062 1063 t = time(NULL); 1064 t_half_lifetime = t - (RIP_LIFETIME/2); 1065 for (; nn; nn--, np++) { 1066 if (np->rip6_metric == NEXTHOP_METRIC) { 1067 /* modify neighbor address */ 1068 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1069 nh = np->rip6_dest; 1070 SET_IN6_LINKLOCAL_IFINDEX(nh, idx); 1071 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1072 } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) { 1073 nh = fsock.sin6_addr; 1074 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1075 } else { 1076 nh = fsock.sin6_addr; 1077 trace(1, "\tInvalid Nexthop: %s\n", 1078 inet6_n2p(&np->rip6_dest)); 1079 } 1080 continue; 1081 } 1082 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) { 1083 trace(1, "\tMulticast netinfo6: %s/%d [%d]\n", 1084 inet6_n2p(&np->rip6_dest), 1085 np->rip6_plen, np->rip6_metric); 1086 continue; 1087 } 1088 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) { 1089 trace(1, "\tLoopback netinfo6: %s/%d [%d]\n", 1090 inet6_n2p(&np->rip6_dest), 1091 np->rip6_plen, np->rip6_metric); 1092 continue; 1093 } 1094 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1095 trace(1, "\tLink Local netinfo6: %s/%d [%d]\n", 1096 inet6_n2p(&np->rip6_dest), 1097 np->rip6_plen, np->rip6_metric); 1098 continue; 1099 } 1100 /* may need to pass sitelocal prefix in some case, however*/ 1101 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) { 1102 trace(1, "\tSite Local netinfo6: %s/%d [%d]\n", 1103 inet6_n2p(&np->rip6_dest), 1104 np->rip6_plen, np->rip6_metric); 1105 continue; 1106 } 1107 trace(2, "\tnetinfo6: %s/%d [%d]", 1108 inet6_n2p(&np->rip6_dest), 1109 np->rip6_plen, np->rip6_metric); 1110 if (np->rip6_tag) 1111 trace(2, " tag=0x%04x", ntohs(np->rip6_tag) & 0xffff); 1112 if (dflag >= 2) { 1113 ia = np->rip6_dest; 1114 applyplen(&ia, np->rip6_plen); 1115 if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest)) 1116 trace(2, " [junk outside prefix]"); 1117 } 1118 1119 /* 1120 * -L: listen only if the prefix matches the configuration 1121 */ 1122 ok = 1; /* if there's no L filter, it is ok */ 1123 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 1124 if (iffp->iff_type != 'L') 1125 continue; 1126 ok = 0; 1127 if (np->rip6_plen < iffp->iff_plen) 1128 continue; 1129 /* special rule: ::/0 means default, not "in /0" */ 1130 if (iffp->iff_plen == 0 && np->rip6_plen > 0) 1131 continue; 1132 ia = np->rip6_dest; 1133 applyplen(&ia, iffp->iff_plen); 1134 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 1135 ok = 1; 1136 break; 1137 } 1138 } 1139 if (!ok) { 1140 trace(2, " (filtered)\n"); 1141 continue; 1142 } 1143 1144 trace(2, "\n"); 1145 np->rip6_metric++; 1146 np->rip6_metric += ifcp->ifc_metric; 1147 if (np->rip6_metric > HOPCNT_INFINITY6) 1148 np->rip6_metric = HOPCNT_INFINITY6; 1149 1150 applyplen(&np->rip6_dest, np->rip6_plen); 1151 if ((rrt = rtsearch(np, NULL)) != NULL) { 1152 if (rrt->rrt_t == 0) 1153 continue; /* Intf route has priority */ 1154 nq = &rrt->rrt_info; 1155 if (nq->rip6_metric > np->rip6_metric) { 1156 if (rrt->rrt_index == ifcp->ifc_index && 1157 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1158 /* Small metric from the same gateway */ 1159 nq->rip6_metric = np->rip6_metric; 1160 } else { 1161 /* Better route found */ 1162 rrt->rrt_index = ifcp->ifc_index; 1163 /* Update routing table */ 1164 delroute(nq, &rrt->rrt_gw); 1165 rrt->rrt_gw = nh; 1166 *nq = *np; 1167 addroute(rrt, &nh, ifcp); 1168 } 1169 rrt->rrt_rflags |= RRTF_CHANGED; 1170 rrt->rrt_t = t; 1171 need_trigger = 1; 1172 } else if (nq->rip6_metric < np->rip6_metric && 1173 rrt->rrt_index == ifcp->ifc_index && 1174 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1175 /* Got worse route from same gw */ 1176 nq->rip6_metric = np->rip6_metric; 1177 rrt->rrt_t = t; 1178 rrt->rrt_rflags |= RRTF_CHANGED; 1179 need_trigger = 1; 1180 } else if (nq->rip6_metric == np->rip6_metric && 1181 np->rip6_metric < HOPCNT_INFINITY6) { 1182 if (rrt->rrt_index == ifcp->ifc_index && 1183 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1184 /* same metric, same route from same gw */ 1185 rrt->rrt_t = t; 1186 } else if (rrt->rrt_t < t_half_lifetime) { 1187 /* Better route found */ 1188 rrt->rrt_index = ifcp->ifc_index; 1189 /* Update routing table */ 1190 delroute(nq, &rrt->rrt_gw); 1191 rrt->rrt_gw = nh; 1192 *nq = *np; 1193 addroute(rrt, &nh, ifcp); 1194 rrt->rrt_rflags |= RRTF_CHANGED; 1195 rrt->rrt_t = t; 1196 } 1197 } 1198 /* 1199 * if nq->rip6_metric == HOPCNT_INFINITY6 then 1200 * do not update age value. Do nothing. 1201 */ 1202 } else if (np->rip6_metric < HOPCNT_INFINITY6) { 1203 /* Got a new valid route */ 1204 if ((rrt = MALLOC(struct riprt)) == NULL) { 1205 fatal("malloc: struct riprt"); 1206 } 1207 memset(rrt, 0, sizeof(*rrt)); 1208 nq = &rrt->rrt_info; 1209 1210 rrt->rrt_same = NULL; 1211 rrt->rrt_index = ifcp->ifc_index; 1212 rrt->rrt_flags = RTF_UP|RTF_GATEWAY; 1213 rrt->rrt_gw = nh; 1214 *nq = *np; 1215 applyplen(&nq->rip6_dest, nq->rip6_plen); 1216 if (nq->rip6_plen == sizeof(struct in6_addr) * 8) 1217 rrt->rrt_flags |= RTF_HOST; 1218 1219 /* Put the route to the list */ 1220 rrt->rrt_next = riprt; 1221 riprt = rrt; 1222 /* Update routing table */ 1223 addroute(rrt, &nh, ifcp); 1224 rrt->rrt_rflags |= RRTF_CHANGED; 1225 need_trigger = 1; 1226 rrt->rrt_t = t; 1227 } 1228 } 1229 /* XXX need to care the interval between triggered updates */ 1230 if (need_trigger) { 1231 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) { 1232 for (ic = ifc; ic; ic = ic->ifc_next) { 1233 if (ifcp->ifc_index == ic->ifc_index) 1234 continue; 1235 if (ic->ifc_flags & IFF_UP) 1236 ripsend(ic, &ic->ifc_ripsin, 1237 RRTF_CHANGED); 1238 } 1239 } 1240 /* Reset the flag */ 1241 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1242 rrt->rrt_rflags &= ~RRTF_CHANGED; 1243 } 1244 } 1245 1246 /* 1247 * Send all routes request packet to the specified interface. 1248 */ 1249 static void 1250 sendrequest(struct ifc *ifcp) 1251 { 1252 struct netinfo6 *np; 1253 int error; 1254 1255 if (ifcp->ifc_flags & IFF_LOOPBACK) 1256 return; 1257 ripbuf->rip6_cmd = RIP6_REQUEST; 1258 np = ripbuf->rip6_nets; 1259 memset(np, 0, sizeof(struct netinfo6)); 1260 np->rip6_metric = HOPCNT_INFINITY6; 1261 tracet(1, "Send rtdump Request to %s (%s)\n", 1262 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1263 error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1)); 1264 if (error == EAFNOSUPPORT) { 1265 /* Protocol not supported */ 1266 tracet(1, "Could not send rtdump Request to %s (%s): " 1267 "set IFF_UP to 0\n", 1268 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1269 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 1270 } 1271 ripbuf->rip6_cmd = RIP6_RESPONSE; 1272 } 1273 1274 /* 1275 * Process a RIP6_REQUEST packet. 1276 */ 1277 static void 1278 riprequest(struct ifc *ifcp, struct netinfo6 *np, int nn, 1279 struct sockaddr_in6 *sin6) 1280 { 1281 int i; 1282 struct riprt *rrt; 1283 1284 if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) && 1285 np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) { 1286 /* Specific response, don't split-horizon */ 1287 trace(1, "\tRIP Request\n"); 1288 for (i = 0; i < nn; i++, np++) { 1289 rrt = rtsearch(np, NULL); 1290 if (rrt) 1291 np->rip6_metric = rrt->rrt_info.rip6_metric; 1292 else 1293 np->rip6_metric = HOPCNT_INFINITY6; 1294 } 1295 (void)sendpacket(sin6, RIPSIZE(nn)); 1296 return; 1297 } 1298 /* Whole routing table dump */ 1299 trace(1, "\tRIP Request -- whole routing table\n"); 1300 ripsend(ifcp, sin6, RRTF_SENDANYWAY); 1301 } 1302 1303 /* 1304 * Get information of each interface. 1305 */ 1306 static void 1307 ifconfig(void) 1308 { 1309 struct ifaddrs *ifap, *ifa; 1310 struct ifc *ifcp; 1311 struct ipv6_mreq mreq; 1312 int s; 1313 1314 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 1315 fatal("socket"); 1316 } 1317 1318 if (getifaddrs(&ifap) != 0) { 1319 fatal("getifaddrs"); 1320 } 1321 1322 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 1323 if (ifa->ifa_addr->sa_family != AF_INET6) 1324 continue; 1325 ifcp = ifc_find(ifa->ifa_name); 1326 /* we are interested in multicast-capable interfaces */ 1327 if ((ifa->ifa_flags & IFF_MULTICAST) == 0) 1328 continue; 1329 if (!ifcp) { 1330 /* new interface */ 1331 if ((ifcp = MALLOC(struct ifc)) == NULL) { 1332 fatal("malloc: struct ifc"); 1333 } 1334 memset(ifcp, 0, sizeof(*ifcp)); 1335 ifcp->ifc_index = -1; 1336 ifcp->ifc_next = ifc; 1337 ifc = ifcp; 1338 nifc++; 1339 ifcp->ifc_name = xstrdup(ifa->ifa_name); 1340 ifcp->ifc_addr = 0; 1341 ifcp->ifc_filter = 0; 1342 ifcp->ifc_flags = ifa->ifa_flags; 1343 trace(1, "newif %s <%s>\n", ifcp->ifc_name, 1344 ifflags(ifcp->ifc_flags)); 1345 if (!strcmp(ifcp->ifc_name, LOOPBACK_IF)) 1346 loopifcp = ifcp; 1347 } else { 1348 /* update flag, this may be up again */ 1349 if (ifcp->ifc_flags != ifa->ifa_flags) { 1350 trace(1, "%s: <%s> -> ", ifcp->ifc_name, 1351 ifflags(ifcp->ifc_flags)); 1352 trace(1, "<%s>\n", ifflags(ifa->ifa_flags)); 1353 ifcp->ifc_cflags |= IFC_CHANGED; 1354 } 1355 ifcp->ifc_flags = ifa->ifa_flags; 1356 } 1357 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s); 1358 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP 1359 && 0 < ifcp->ifc_index && !ifcp->ifc_joined) { 1360 mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr; 1361 mreq.ipv6mr_interface = ifcp->ifc_index; 1362 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP, 1363 &mreq, sizeof(mreq)) < 0) { 1364 fatal("IPV6_JOIN_GROUP"); 1365 } 1366 trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST); 1367 ifcp->ifc_joined++; 1368 } 1369 } 1370 close(s); 1371 freeifaddrs(ifap); 1372 } 1373 1374 static void 1375 ifconfig1(const char *name, const struct sockaddr *sa, struct ifc *ifcp, int s) 1376 { 1377 struct in6_ifreq ifr; 1378 const struct sockaddr_in6 *sin6; 1379 struct ifac *ifa; 1380 int plen; 1381 char buf[BUFSIZ]; 1382 1383 sin6 = (const struct sockaddr_in6 *)sa; 1384 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) && !lflag) 1385 return; 1386 ifr.ifr_addr = *sin6; 1387 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 1388 if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) { 1389 fatal("ioctl: SIOCGIFNETMASK_IN6"); 1390 } 1391 plen = sin6mask2len(&ifr.ifr_addr); 1392 if ((ifa = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) { 1393 /* same interface found */ 1394 /* need check if something changed */ 1395 /* XXX not yet implemented */ 1396 return; 1397 } 1398 /* 1399 * New address is found 1400 */ 1401 if ((ifa = MALLOC(struct ifac)) == NULL) { 1402 fatal("malloc: struct ifac"); 1403 } 1404 memset(ifa, 0, sizeof(*ifa)); 1405 ifa->ifa_conf = ifcp; 1406 ifa->ifa_next = ifcp->ifc_addr; 1407 ifcp->ifc_addr = ifa; 1408 ifa->ifa_addr = sin6->sin6_addr; 1409 ifa->ifa_plen = plen; 1410 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1411 ifr.ifr_addr = *sin6; 1412 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) { 1413 fatal("ioctl: SIOCGIFDSTADDR_IN6"); 1414 } 1415 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr; 1416 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf)); 1417 trace(1, "found address %s/%d -- %s\n", 1418 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf); 1419 } else { 1420 trace(1, "found address %s/%d\n", 1421 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen); 1422 } 1423 if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 1424 ifcp->ifc_mylladdr = ifa->ifa_addr; 1425 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr); 1426 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len); 1427 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr, 1428 ifcp->ifc_index); 1429 setindex2ifc(ifcp->ifc_index, ifcp); 1430 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index); 1431 if (ifcp->ifc_mtu > RIP6_MAXMTU) 1432 ifcp->ifc_mtu = RIP6_MAXMTU; 1433 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) { 1434 fatal("ioctl: SIOCGIFMETRIC"); 1435 } 1436 ifcp->ifc_metric = ifr.ifr_metric; 1437 trace(1, "\tindex: %d, mtu: %d, metric: %d\n", 1438 ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric); 1439 } else 1440 ifcp->ifc_cflags |= IFC_CHANGED; 1441 } 1442 1443 /* 1444 * Receive and process routing messages. 1445 * Update interface information as necessary. 1446 */ 1447 static void 1448 rtrecv(void) 1449 { 1450 char buf[BUFSIZ]; 1451 char *p, *q; 1452 struct rt_msghdr *rtm; 1453 struct ifa_msghdr *ifam; 1454 struct if_msghdr *ifm; 1455 int len; 1456 struct ifc *ifcp, *ic; 1457 int iface = 0, rtable = 0; 1458 struct sockaddr_in6 *rta[RTAX_MAX]; 1459 struct sockaddr_in6 mask; 1460 int i, addrs; 1461 struct riprt *rrt; 1462 1463 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 1464 perror("read from rtsock"); 1465 exit(1); 1466 } 1467 if (len < (int)sizeof(*rtm)) { 1468 trace(1, "short read from rtsock: %d (should be > %lu)\n", 1469 len, (u_long)sizeof(*rtm)); 1470 return; 1471 } 1472 if (dflag >= 2) { 1473 fprintf(stderr, "rtmsg:\n"); 1474 for (i = 0; i < len; i++) { 1475 fprintf(stderr, "%02x ", buf[i] & 0xff); 1476 if (i % 16 == 15) fprintf(stderr, "\n"); 1477 } 1478 fprintf(stderr, "\n"); 1479 } 1480 1481 for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) { 1482 /* safety against bogus message */ 1483 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) { 1484 trace(1, "bogus rtmsg: length=%d\n", 1485 ((struct rt_msghdr *)p)->rtm_msglen); 1486 break; 1487 } 1488 rtm = NULL; 1489 ifam = NULL; 1490 ifm = NULL; 1491 switch (((struct rt_msghdr *)p)->rtm_type) { 1492 case RTM_NEWADDR: 1493 case RTM_DELADDR: 1494 ifam = (struct ifa_msghdr *)p; 1495 addrs = ifam->ifam_addrs; 1496 q = (char *)(ifam + 1); 1497 break; 1498 case RTM_IFINFO: 1499 ifm = (struct if_msghdr *)p; 1500 addrs = ifm->ifm_addrs; 1501 q = (char *)(ifm + 1); 1502 break; 1503 default: 1504 rtm = (struct rt_msghdr *)p; 1505 addrs = rtm->rtm_addrs; 1506 q = (char *)(rtm + 1); 1507 if (rtm->rtm_version != RTM_VERSION) { 1508 trace(1, "unexpected rtmsg version %d " 1509 "(should be %d)\n", 1510 rtm->rtm_version, RTM_VERSION); 1511 continue; 1512 } 1513 if (rtm->rtm_pid == pid) { 1514 #if 0 1515 trace(1, "rtmsg looped back to me, ignored\n"); 1516 #endif 1517 continue; 1518 } 1519 break; 1520 } 1521 memset(&rta, 0, sizeof(rta)); 1522 for (i = 0; i < RTAX_MAX; i++) { 1523 if (addrs & (1 << i)) { 1524 rta[i] = (struct sockaddr_in6 *)q; 1525 q += ROUNDUP(rta[i]->sin6_len); 1526 } 1527 } 1528 1529 trace(1, "rtsock: %s (addrs=%x)\n", 1530 rttypes((struct rt_msghdr *)p), addrs); 1531 if (dflag >= 2) { 1532 for (i = 0; 1533 i < ((struct rt_msghdr *)p)->rtm_msglen; 1534 i++) { 1535 fprintf(stderr, "%02x ", p[i] & 0xff); 1536 if (i % 16 == 15) fprintf(stderr, "\n"); 1537 } 1538 fprintf(stderr, "\n"); 1539 } 1540 1541 /* 1542 * Easy ones first. 1543 * 1544 * We may be able to optimize by using ifm->ifm_index or 1545 * ifam->ifam_index. For simplicity we don't do that here. 1546 */ 1547 switch (((struct rt_msghdr *)p)->rtm_type) { 1548 case RTM_NEWADDR: 1549 case RTM_IFINFO: 1550 iface++; 1551 continue; 1552 case RTM_ADD: 1553 rtable++; 1554 continue; 1555 case RTM_LOSING: 1556 case RTM_MISS: 1557 case RTM_GET: 1558 case RTM_LOCK: 1559 /* nothing to be done here */ 1560 trace(1, "\tnothing to be done, ignored\n"); 1561 continue; 1562 } 1563 1564 #if 0 1565 if (rta[RTAX_DST] == NULL) { 1566 trace(1, "\tno destination, ignored\n"); 1567 continue; 1568 } 1569 if (rta[RTAX_DST]->sin6_family != AF_INET6) { 1570 trace(1, "\taf mismatch, ignored\n"); 1571 continue; 1572 } 1573 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) { 1574 trace(1, "\tlinklocal destination, ignored\n"); 1575 continue; 1576 } 1577 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) { 1578 trace(1, "\tloopback destination, ignored\n"); 1579 continue; /* Loopback */ 1580 } 1581 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) { 1582 trace(1, "\tmulticast destination, ignored\n"); 1583 continue; 1584 } 1585 #endif 1586 1587 /* hard ones */ 1588 switch (((struct rt_msghdr *)p)->rtm_type) { 1589 case RTM_NEWADDR: 1590 case RTM_IFINFO: 1591 case RTM_ADD: 1592 case RTM_LOSING: 1593 case RTM_MISS: 1594 case RTM_GET: 1595 case RTM_LOCK: 1596 /* should already be handled */ 1597 fatal("rtrecv: never reach here"); 1598 /* NOTREACHED */ 1599 case RTM_DELETE: 1600 if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) { 1601 trace(1, "\tsome of dst/gw/netamsk are " 1602 "unavailable, ignored\n"); 1603 break; 1604 } 1605 if ((rtm->rtm_flags & RTF_HOST) != 0) { 1606 mask.sin6_len = sizeof(mask); 1607 memset(&mask.sin6_addr, 0xff, 1608 sizeof(mask.sin6_addr)); 1609 rta[RTAX_NETMASK] = &mask; 1610 } else if (!rta[RTAX_NETMASK]) { 1611 trace(1, "\tsome of dst/gw/netamsk are " 1612 "unavailable, ignored\n"); 1613 break; 1614 } 1615 if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY], 1616 rta[RTAX_NETMASK]) == 0) { 1617 rtable++; /*just to be sure*/ 1618 } 1619 break; 1620 case RTM_CHANGE: 1621 case RTM_REDIRECT: 1622 trace(1, "\tnot supported yet, ignored\n"); 1623 break; 1624 case RTM_DELADDR: 1625 if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) { 1626 trace(1, "\tno netmask or ifa given, ignored\n"); 1627 break; 1628 } 1629 if (ifam->ifam_index < nindex2ifc) 1630 ifcp = index2ifc[ifam->ifam_index]; 1631 else 1632 ifcp = NULL; 1633 if (!ifcp) { 1634 trace(1, "\tinvalid ifam_index %d, ignored\n", 1635 ifam->ifam_index); 1636 break; 1637 } 1638 if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK])) 1639 iface++; 1640 break; 1641 case RTM_OLDADD: 1642 case RTM_OLDDEL: 1643 trace(1, "\tnot supported yet, ignored\n"); 1644 break; 1645 } 1646 1647 } 1648 1649 if (iface) { 1650 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n"); 1651 ifconfig(); 1652 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 1653 if (ifcp->ifc_cflags & IFC_CHANGED) { 1654 if (ifrt(ifcp, 1)) { 1655 for (ic = ifc; ic; ic = ic->ifc_next) { 1656 if (ifcp->ifc_index == ic->ifc_index) 1657 continue; 1658 if (ic->ifc_flags & IFF_UP) 1659 ripsend(ic, &ic->ifc_ripsin, 1660 RRTF_CHANGED); 1661 } 1662 /* Reset the flag */ 1663 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1664 rrt->rrt_rflags &= ~RRTF_CHANGED; 1665 } 1666 ifcp->ifc_cflags &= ~IFC_CHANGED; 1667 } 1668 } 1669 if (rtable) { 1670 trace(1, "rtsock: read routing table again\n"); 1671 krtread(1); 1672 } 1673 } 1674 1675 /* 1676 * remove specified route from the internal routing table. 1677 */ 1678 static int 1679 rt_del(const struct sockaddr_in6 *sdst, const struct sockaddr_in6 *sgw, 1680 const struct sockaddr_in6 *smask) 1681 { 1682 const struct in6_addr *dst = NULL; 1683 const struct in6_addr *gw = NULL; 1684 int prefix; 1685 struct netinfo6 ni6; 1686 struct riprt *rrt = NULL; 1687 time_t t_lifetime; 1688 1689 if (sdst->sin6_family != AF_INET6) { 1690 trace(1, "\tother AF, ignored\n"); 1691 return -1; 1692 } 1693 if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr) 1694 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback) 1695 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) { 1696 trace(1, "\taddress %s not interesting, ignored\n", 1697 inet6_n2p(&sdst->sin6_addr)); 1698 return -1; 1699 } 1700 dst = &sdst->sin6_addr; 1701 if (sgw->sin6_family == AF_INET6) { 1702 /* easy case */ 1703 gw = &sgw->sin6_addr; 1704 prefix = sin6mask2len(smask); 1705 } else if (sgw->sin6_family == AF_LINK) { 1706 /* 1707 * Interface route... a hard case. We need to get the prefix 1708 * length from the kernel, but we now are parsing rtmsg. 1709 * We'll purge matching routes from my list, then get the 1710 * fresh list. 1711 */ 1712 struct riprt *longest; 1713 trace(1, "\t%s is an interface route, guessing prefixlen\n", 1714 inet6_n2p(dst)); 1715 longest = NULL; 1716 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 1717 if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 1718 &sdst->sin6_addr) 1719 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) { 1720 if (!longest 1721 || longest->rrt_info.rip6_plen < 1722 rrt->rrt_info.rip6_plen) { 1723 longest = rrt; 1724 } 1725 } 1726 } 1727 rrt = longest; 1728 if (!rrt) { 1729 trace(1, "\tno matching interface route found\n"); 1730 return -1; 1731 } 1732 gw = &in6addr_loopback; 1733 prefix = rrt->rrt_info.rip6_plen; 1734 } else { 1735 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family); 1736 return -1; 1737 } 1738 1739 trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix); 1740 trace(1, "gw %s\n", inet6_n2p(gw)); 1741 t_lifetime = time(NULL) - RIP_LIFETIME; 1742 /* age route for interface address */ 1743 memset(&ni6, 0, sizeof(ni6)); 1744 ni6.rip6_dest = *dst; 1745 ni6.rip6_plen = prefix; 1746 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 1747 trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest), 1748 ni6.rip6_plen); 1749 if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) { 1750 trace(1, "\tno route found\n"); 1751 return -1; 1752 } 1753 #if 0 1754 if ((rrt->rrt_flags & RTF_STATIC) == 0) { 1755 trace(1, "\tyou can delete static routes only\n"); 1756 } else 1757 #endif 1758 if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) { 1759 trace(1, "\tgw mismatch: %s <-> ", 1760 inet6_n2p(&rrt->rrt_gw)); 1761 trace(1, "%s\n", inet6_n2p(gw)); 1762 } else { 1763 trace(1, "\troute found, age it\n"); 1764 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1765 rrt->rrt_t = t_lifetime; 1766 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 1767 } 1768 } 1769 return 0; 1770 } 1771 1772 /* 1773 * remove specified address from internal interface/routing table. 1774 */ 1775 static int 1776 rt_deladdr(struct ifc *ifcp, const struct sockaddr_in6 *sifa, 1777 const struct sockaddr_in6 *smask) 1778 { 1779 const struct in6_addr *addr = NULL; 1780 int prefix; 1781 struct ifac *ifa = NULL; 1782 struct netinfo6 ni6; 1783 struct riprt *rrt = NULL; 1784 time_t t_lifetime; 1785 int updated = 0; 1786 1787 if (sifa->sin6_family != AF_INET6) { 1788 trace(1, "\tother AF, ignored\n"); 1789 return -1; 1790 } 1791 addr = &sifa->sin6_addr; 1792 prefix = sin6mask2len(smask); 1793 1794 trace(1, "\tdeleting %s/%d from %s\n", 1795 inet6_n2p(addr), prefix, ifcp->ifc_name); 1796 ifa = ifa_match(ifcp, addr, prefix); 1797 if (!ifa) { 1798 trace(1, "\tno matching ifa found for %s/%d on %s\n", 1799 inet6_n2p(addr), prefix, ifcp->ifc_name); 1800 return -1; 1801 } 1802 if (ifa->ifa_conf != ifcp) { 1803 trace(1, "\taddress table corrupt: back pointer does not match " 1804 "(%s != %s)\n", 1805 ifcp->ifc_name, ifa->ifa_conf->ifc_name); 1806 return -1; 1807 } 1808 /* remove ifa from interface */ 1809 if (ifcp->ifc_addr == ifa) 1810 ifcp->ifc_addr = ifa->ifa_next; 1811 else { 1812 struct ifac *p; 1813 for (p = ifcp->ifc_addr; p; p = p->ifa_next) { 1814 if (p->ifa_next == ifa) { 1815 p->ifa_next = ifa->ifa_next; 1816 break; 1817 } 1818 } 1819 } 1820 ifa->ifa_next = NULL; 1821 ifa->ifa_conf = NULL; 1822 t_lifetime = time(NULL) - RIP_LIFETIME; 1823 /* age route for interface address */ 1824 memset(&ni6, 0, sizeof(ni6)); 1825 ni6.rip6_dest = ifa->ifa_addr; 1826 ni6.rip6_plen = ifa->ifa_plen; 1827 applyplen(&ni6.rip6_dest, ni6.rip6_plen); 1828 trace(1, "\tfind interface route %s/%d on %d\n", 1829 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index); 1830 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 1831 struct in6_addr none; 1832 memset(&none, 0, sizeof(none)); 1833 if (rrt->rrt_index == ifcp->ifc_index && 1834 (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) || 1835 IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) { 1836 trace(1, "\troute found, age it\n"); 1837 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1838 rrt->rrt_t = t_lifetime; 1839 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 1840 } 1841 updated++; 1842 } else { 1843 trace(1, "\tnon-interface route found: %s/%d on %d\n", 1844 inet6_n2p(&rrt->rrt_info.rip6_dest), 1845 rrt->rrt_info.rip6_plen, 1846 rrt->rrt_index); 1847 } 1848 } else 1849 trace(1, "\tno interface route found\n"); 1850 /* age route for p2p destination */ 1851 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1852 memset(&ni6, 0, sizeof(ni6)); 1853 ni6.rip6_dest = ifa->ifa_raddr; 1854 ni6.rip6_plen = 128; 1855 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 1856 trace(1, "\tfind p2p route %s/%d on %d\n", 1857 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, 1858 ifcp->ifc_index); 1859 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 1860 if (rrt->rrt_index == ifcp->ifc_index && 1861 IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) { 1862 trace(1, "\troute found, age it\n"); 1863 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1864 rrt->rrt_t = t_lifetime; 1865 rrt->rrt_info.rip6_metric = 1866 HOPCNT_INFINITY6; 1867 updated++; 1868 } 1869 } else { 1870 trace(1, "\tnon-p2p route found: %s/%d on %d\n", 1871 inet6_n2p(&rrt->rrt_info.rip6_dest), 1872 rrt->rrt_info.rip6_plen, 1873 rrt->rrt_index); 1874 } 1875 } else 1876 trace(1, "\tno p2p route found\n"); 1877 } 1878 return updated ? 0 : -1; 1879 } 1880 1881 /* 1882 * Get each interface address and put those interface routes to the route 1883 * list. 1884 */ 1885 static int 1886 ifrt(struct ifc *ifcp, int again) 1887 { 1888 struct ifac *ifa; 1889 struct riprt *rrt = NULL, *search_rrt, *prev_rrt, *loop_rrt; 1890 struct netinfo6 *np; 1891 time_t t_lifetime; 1892 int need_trigger = 0; 1893 1894 #if 0 1895 if (ifcp->ifc_flags & IFF_LOOPBACK) 1896 return 0; /* ignore loopback */ 1897 #endif 1898 1899 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1900 ifrt_p2p(ifcp, again); 1901 return 0; 1902 } 1903 1904 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 1905 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 1906 #if 0 1907 trace(1, "route: %s on %s: " 1908 "skip linklocal interface address\n", 1909 inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name); 1910 #endif 1911 continue; 1912 } 1913 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) { 1914 #if 0 1915 trace(1, "route: %s: skip unspec interface address\n", 1916 ifcp->ifc_name); 1917 #endif 1918 continue; 1919 } 1920 if (IN6_IS_ADDR_LOOPBACK(&ifa->ifa_addr)) { 1921 #if 0 1922 trace(1, "route: %s: skip loopback address\n", 1923 ifcp->ifc_name); 1924 #endif 1925 continue; 1926 } 1927 if (ifcp->ifc_flags & IFF_UP) { 1928 if ((rrt = MALLOC(struct riprt)) == NULL) 1929 fatal("malloc: struct riprt"); 1930 memset(rrt, 0, sizeof(*rrt)); 1931 rrt->rrt_same = NULL; 1932 rrt->rrt_index = ifcp->ifc_index; 1933 rrt->rrt_t = 0; /* don't age */ 1934 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 1935 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 1936 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 1937 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 1938 if (ifa->ifa_plen == 128) 1939 rrt->rrt_flags = RTF_HOST; 1940 else 1941 rrt->rrt_flags = RTF_CONNECTED; 1942 rrt->rrt_rflags |= RRTF_CHANGED; 1943 applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen); 1944 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 1945 rrt->rrt_gw = ifa->ifa_addr; 1946 np = &rrt->rrt_info; 1947 search_rrt = rtsearch(np, &prev_rrt); 1948 if (search_rrt != NULL) { 1949 if (search_rrt->rrt_info.rip6_metric <= 1950 rrt->rrt_info.rip6_metric) { 1951 /* Already have better route */ 1952 if (!again) { 1953 trace(1, "route: %s/%d: " 1954 "already registered (%s)\n", 1955 inet6_n2p(&np->rip6_dest), np->rip6_plen, 1956 ifcp->ifc_name); 1957 } 1958 goto next; 1959 } 1960 1961 if (prev_rrt) 1962 prev_rrt->rrt_next = rrt->rrt_next; 1963 else 1964 riprt = rrt->rrt_next; 1965 delroute(&rrt->rrt_info, &rrt->rrt_gw); 1966 } 1967 /* Attach the route to the list */ 1968 trace(1, "route: %s/%d: register route (%s)\n", 1969 inet6_n2p(&np->rip6_dest), np->rip6_plen, 1970 ifcp->ifc_name); 1971 rrt->rrt_next = riprt; 1972 riprt = rrt; 1973 addroute(rrt, &rrt->rrt_gw, ifcp); 1974 rrt = NULL; 1975 sendrequest(ifcp); 1976 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 1977 need_trigger = 1; 1978 } else { 1979 for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) { 1980 if (loop_rrt->rrt_index == ifcp->ifc_index) { 1981 t_lifetime = time(NULL) - RIP_LIFETIME; 1982 if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) { 1983 loop_rrt->rrt_t = t_lifetime; 1984 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 1985 loop_rrt->rrt_rflags |= RRTF_CHANGED; 1986 need_trigger = 1; 1987 } 1988 } 1989 } 1990 } 1991 next: 1992 if (rrt) 1993 free(rrt); 1994 } 1995 return need_trigger; 1996 } 1997 1998 /* 1999 * there are couple of p2p interface routing models. "behavior" lets 2000 * you pick one. it looks that gated behavior fits best with BSDs, 2001 * since BSD kernels do not look at prefix length on p2p interfaces. 2002 */ 2003 static void 2004 ifrt_p2p(struct ifc *ifcp, int again) 2005 { 2006 struct ifac *ifa; 2007 struct riprt *rrt, *orrt, *prevrrt; 2008 struct netinfo6 *np; 2009 struct in6_addr addr, dest; 2010 int advert, ignore, i; 2011 #define P2PADVERT_NETWORK 1 2012 #define P2PADVERT_ADDR 2 2013 #define P2PADVERT_DEST 4 2014 #define P2PADVERT_MAX 4 2015 #define CISCO 0 2016 #define GATED 1 2017 #define ROUTE6D 2 2018 #define BEHAVIOR GATED 2019 const char *category = ""; 2020 const char *noadv; 2021 2022 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2023 addr = ifa->ifa_addr; 2024 dest = ifa->ifa_raddr; 2025 applyplen(&addr, ifa->ifa_plen); 2026 applyplen(&dest, ifa->ifa_plen); 2027 advert = ignore = 0; 2028 #if BEHAVIOR == CISCO 2029 /* 2030 * honor addr/plen, just like normal shared medium 2031 * interface. this may cause trouble if you reuse 2032 * addr/plen on other interfaces. 2033 * 2034 * advertise addr/plen. 2035 */ 2036 advert |= P2PADVERT_NETWORK; 2037 #endif 2038 #if BEHAVIOR == GATED 2039 /* 2040 * prefixlen on p2p interface is meaningless. 2041 * advertise addr/128 and dest/128. 2042 * 2043 * do not install network route to route6d routing 2044 * table (if we do, it would prevent route installation 2045 * for other p2p interface that shares addr/plen). 2046 * 2047 * XXX what should we do if dest is ::? it will not 2048 * get announced anyways (see following filter), 2049 * but we need to think. 2050 */ 2051 advert |= P2PADVERT_ADDR; 2052 advert |= P2PADVERT_DEST; 2053 ignore |= P2PADVERT_NETWORK; 2054 #endif 2055 #if BEHAVIOR == ROUTE6D 2056 /* 2057 * just for testing. actually the code is redundant 2058 * given the current p2p interface address assignment 2059 * rule for kame kernel. 2060 * 2061 * intent: 2062 * A/n -> announce A/n 2063 * A B/n, A and B share prefix -> A/n (= B/n) 2064 * A B/n, do not share prefix -> A/128 and B/128 2065 * actually, A/64 and A B/128 are the only cases 2066 * permitted by the kernel: 2067 * A/64 -> A/64 2068 * A B/128 -> A/128 and B/128 2069 */ 2070 if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) { 2071 if (IN6_ARE_ADDR_EQUAL(&addr, &dest)) 2072 advert |= P2PADVERT_NETWORK; 2073 else { 2074 advert |= P2PADVERT_ADDR; 2075 advert |= P2PADVERT_DEST; 2076 ignore |= P2PADVERT_NETWORK; 2077 } 2078 } else 2079 advert |= P2PADVERT_NETWORK; 2080 #endif 2081 2082 for (i = 1; i <= P2PADVERT_MAX; i *= 2) { 2083 if ((ignore & i) != 0) 2084 continue; 2085 if ((rrt = MALLOC(struct riprt)) == NULL) { 2086 fatal("malloc: struct riprt"); 2087 } 2088 memset(rrt, 0, sizeof(*rrt)); 2089 rrt->rrt_same = NULL; 2090 rrt->rrt_index = ifcp->ifc_index; 2091 rrt->rrt_t = 0; /* don't age */ 2092 switch (i) { 2093 case P2PADVERT_NETWORK: 2094 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2095 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 2096 applyplen(&rrt->rrt_info.rip6_dest, 2097 ifa->ifa_plen); 2098 category = "network"; 2099 break; 2100 case P2PADVERT_ADDR: 2101 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2102 rrt->rrt_info.rip6_plen = 128; 2103 rrt->rrt_gw = in6addr_loopback; 2104 category = "addr"; 2105 break; 2106 case P2PADVERT_DEST: 2107 rrt->rrt_info.rip6_dest = ifa->ifa_raddr; 2108 rrt->rrt_info.rip6_plen = 128; 2109 rrt->rrt_gw = ifa->ifa_addr; 2110 category = "dest"; 2111 break; 2112 } 2113 if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) || 2114 IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) { 2115 #if 0 2116 trace(1, "route: %s: skip unspec/linklocal " 2117 "(%s on %s)\n", category, ifcp->ifc_name); 2118 #endif 2119 free(rrt); 2120 continue; 2121 } 2122 if ((advert & i) == 0) { 2123 rrt->rrt_rflags |= RRTF_NOADVERTISE; 2124 noadv = ", NO-ADV"; 2125 } else 2126 noadv = ""; 2127 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2128 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2129 np = &rrt->rrt_info; 2130 orrt = rtsearch(np, &prevrrt); 2131 if (!orrt) { 2132 /* Attach the route to the list */ 2133 trace(1, "route: %s/%d: register route " 2134 "(%s on %s%s)\n", 2135 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2136 category, ifcp->ifc_name, noadv); 2137 rrt->rrt_next = riprt; 2138 riprt = rrt; 2139 } else if (rrt->rrt_index != orrt->rrt_index || 2140 rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) { 2141 /* swap route */ 2142 rrt->rrt_next = orrt->rrt_next; 2143 if (prevrrt) 2144 prevrrt->rrt_next = rrt; 2145 else 2146 riprt = rrt; 2147 free(orrt); 2148 2149 trace(1, "route: %s/%d: update (%s on %s%s)\n", 2150 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2151 category, ifcp->ifc_name, noadv); 2152 } else { 2153 /* Already found */ 2154 if (!again) { 2155 trace(1, "route: %s/%d: " 2156 "already registered (%s on %s%s)\n", 2157 inet6_n2p(&np->rip6_dest), 2158 np->rip6_plen, category, 2159 ifcp->ifc_name, noadv); 2160 } 2161 free(rrt); 2162 } 2163 } 2164 } 2165 #undef P2PADVERT_NETWORK 2166 #undef P2PADVERT_ADDR 2167 #undef P2PADVERT_DEST 2168 #undef P2PADVERT_MAX 2169 } 2170 2171 static int 2172 getifmtu(int ifindex) 2173 { 2174 int mib[6]; 2175 char *buf; 2176 size_t msize; 2177 struct if_msghdr *ifm; 2178 int mtu; 2179 2180 mib[0] = CTL_NET; 2181 mib[1] = PF_ROUTE; 2182 mib[2] = 0; 2183 mib[3] = AF_INET6; 2184 mib[4] = NET_RT_IFLIST; 2185 mib[5] = ifindex; 2186 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2187 fatal("sysctl estimate NET_RT_IFLIST"); 2188 } 2189 if ((buf = malloc(msize)) == NULL) { 2190 fatal("malloc"); 2191 } 2192 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2193 fatal("sysctl NET_RT_IFLIST"); 2194 } 2195 ifm = (struct if_msghdr *)buf; 2196 mtu = ifm->ifm_data.ifi_mtu; 2197 2198 free(buf); 2199 return mtu; 2200 } 2201 2202 static const char * 2203 rttypes(struct rt_msghdr *rtm) 2204 { 2205 #define RTTYPE(s, f) \ 2206 do { \ 2207 if (rtm->rtm_type == (f)) \ 2208 return (s); \ 2209 } while (0) 2210 RTTYPE("ADD", RTM_ADD); 2211 RTTYPE("DELETE", RTM_DELETE); 2212 RTTYPE("CHANGE", RTM_CHANGE); 2213 RTTYPE("GET", RTM_GET); 2214 RTTYPE("LOSING", RTM_LOSING); 2215 RTTYPE("REDIRECT", RTM_REDIRECT); 2216 RTTYPE("MISS", RTM_MISS); 2217 RTTYPE("LOCK", RTM_LOCK); 2218 RTTYPE("OLDADD", RTM_OLDADD); 2219 RTTYPE("OLDDEL", RTM_OLDDEL); 2220 RTTYPE("NEWADDR", RTM_NEWADDR); 2221 RTTYPE("DELADDR", RTM_DELADDR); 2222 RTTYPE("IFINFO", RTM_IFINFO); 2223 #ifdef RTM_OLDADD 2224 RTTYPE("OLDADD", RTM_OLDADD); 2225 #endif 2226 #ifdef RTM_OLDDEL 2227 RTTYPE("OLDDEL", RTM_OLDDEL); 2228 #endif 2229 #ifdef RTM_OIFINFO 2230 RTTYPE("OIFINFO", RTM_OIFINFO); 2231 #endif 2232 #ifdef RTM_IFANNOUNCE 2233 RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE); 2234 #endif 2235 #ifdef RTM_NEWMADDR 2236 RTTYPE("NEWMADDR", RTM_NEWMADDR); 2237 #endif 2238 #ifdef RTM_DELMADDR 2239 RTTYPE("DELMADDR", RTM_DELMADDR); 2240 #endif 2241 #undef RTTYPE 2242 return NULL; 2243 } 2244 2245 static const char * 2246 rtflags(struct rt_msghdr *rtm) 2247 { 2248 static char buf[BUFSIZ]; 2249 2250 /* 2251 * letter conflict should be okay. painful when *BSD diverges... 2252 */ 2253 strlcpy(buf, "", sizeof(buf)); 2254 #define RTFLAG(s, f) \ 2255 do { \ 2256 if (rtm->rtm_flags & (f)) \ 2257 strlcat(buf, (s), sizeof(buf)); \ 2258 } while (0) 2259 RTFLAG("U", RTF_UP); 2260 RTFLAG("G", RTF_GATEWAY); 2261 RTFLAG("H", RTF_HOST); 2262 RTFLAG("R", RTF_REJECT); 2263 RTFLAG("D", RTF_DYNAMIC); 2264 RTFLAG("M", RTF_MODIFIED); 2265 RTFLAG("d", RTF_DONE); 2266 #ifdef RTF_MASK 2267 RTFLAG("m", RTF_MASK); 2268 #endif 2269 RTFLAG("C", RTF_CONNECTED); 2270 #ifdef RTF_CLONED 2271 RTFLAG("c", RTF_CLONED); 2272 #endif 2273 #ifdef RTF_PRCLONING 2274 RTFLAG("c", RTF_PRCLONING); 2275 #endif 2276 #ifdef RTF_WASCLONED 2277 RTFLAG("W", RTF_WASCLONED); 2278 #endif 2279 RTFLAG("S", RTF_STATIC); 2280 RTFLAG("B", RTF_BLACKHOLE); 2281 #ifdef RTF_PROTO3 2282 RTFLAG("3", RTF_PROTO3); 2283 #endif 2284 RTFLAG("2", RTF_PROTO2); 2285 RTFLAG("1", RTF_PROTO1); 2286 #ifdef RTF_BROADCAST 2287 RTFLAG("b", RTF_BROADCAST); 2288 #endif 2289 #ifdef RTF_DEFAULT 2290 RTFLAG("d", RTF_DEFAULT); 2291 #endif 2292 #ifdef RTF_ISAROUTER 2293 RTFLAG("r", RTF_ISAROUTER); 2294 #endif 2295 #ifdef RTF_TUNNEL 2296 RTFLAG("T", RTF_TUNNEL); 2297 #endif 2298 #ifdef RTF_AUTH 2299 RTFLAG("A", RTF_AUTH); 2300 #endif 2301 #ifdef RTF_CRYPT 2302 RTFLAG("E", RTF_CRYPT); 2303 #endif 2304 #undef RTFLAG 2305 return buf; 2306 } 2307 2308 static const char * 2309 ifflags(int flags) 2310 { 2311 static char buf[BUFSIZ]; 2312 2313 strlcpy(buf, "", sizeof(buf)); 2314 #define IFFLAG(s, f) \ 2315 do { \ 2316 if (flags & (f)) { \ 2317 if (buf[0]) \ 2318 strlcat(buf, ",", sizeof(buf)); \ 2319 strlcat(buf, (s), sizeof(buf)); \ 2320 } \ 2321 } while (0) 2322 IFFLAG("UP", IFF_UP); 2323 IFFLAG("BROADCAST", IFF_BROADCAST); 2324 IFFLAG("DEBUG", IFF_DEBUG); 2325 IFFLAG("LOOPBACK", IFF_LOOPBACK); 2326 IFFLAG("POINTOPOINT", IFF_POINTOPOINT); 2327 #ifdef IFF_NOTRAILERS 2328 IFFLAG("NOTRAILERS", IFF_NOTRAILERS); 2329 #endif 2330 #ifdef IFF_SMART 2331 IFFLAG("SMART", IFF_SMART); 2332 #endif 2333 IFFLAG("RUNNING", IFF_RUNNING); 2334 IFFLAG("NOARP", IFF_NOARP); 2335 IFFLAG("PROMISC", IFF_PROMISC); 2336 IFFLAG("ALLMULTI", IFF_ALLMULTI); 2337 IFFLAG("OACTIVE", IFF_OACTIVE); 2338 IFFLAG("SIMPLEX", IFF_SIMPLEX); 2339 IFFLAG("LINK0", IFF_LINK0); 2340 IFFLAG("LINK1", IFF_LINK1); 2341 IFFLAG("LINK2", IFF_LINK2); 2342 IFFLAG("MULTICAST", IFF_MULTICAST); 2343 #undef IFFLAG 2344 return buf; 2345 } 2346 2347 static void 2348 krtread(int again) 2349 { 2350 int mib[6]; 2351 size_t msize; 2352 char *buf = NULL, *p, *lim; 2353 struct rt_msghdr *rtm; 2354 int retry; 2355 const char *errmsg; 2356 2357 retry = 0; 2358 buf = NULL; 2359 mib[0] = CTL_NET; 2360 mib[1] = PF_ROUTE; 2361 mib[2] = 0; 2362 mib[3] = AF_INET6; /* Address family */ 2363 mib[4] = NET_RT_DUMP; /* Dump the kernel routing table */ 2364 mib[5] = 0; /* No flags */ 2365 do { 2366 retry++; 2367 errmsg = NULL; 2368 if (buf) { 2369 free(buf); 2370 buf = NULL; 2371 } 2372 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2373 errmsg = "sysctl estimate"; 2374 continue; 2375 } 2376 if ((buf = malloc(msize)) == NULL) { 2377 errmsg = "malloc"; 2378 continue; 2379 } 2380 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2381 errmsg = "sysctl NET_RT_DUMP"; 2382 continue; 2383 } 2384 } while (retry < 5 && errmsg != NULL); 2385 if (errmsg) { 2386 fatal("%s (with %d retries, msize=%lu)", errmsg, retry, 2387 (u_long)msize); 2388 } else if (1 < retry) 2389 syslog(LOG_INFO, "NET_RT_DUMP %d retries", retry); 2390 2391 lim = buf + msize; 2392 for (p = buf; p < lim; p += rtm->rtm_msglen) { 2393 rtm = (struct rt_msghdr *)p; 2394 rt_entry(rtm, again); 2395 } 2396 free(buf); 2397 } 2398 2399 static void 2400 rt_entry(struct rt_msghdr *rtm, int again) 2401 { 2402 struct sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask; 2403 struct sockaddr_in6 *sin6_genmask, *sin6_ifp; 2404 char *rtmp, *ifname = NULL; 2405 struct riprt *rrt, *orrt; 2406 struct netinfo6 *np; 2407 int s; 2408 2409 sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0; 2410 if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags & 2411 (RTF_CONNECTED|RTF_BLACKHOLE)) { 2412 return; /* not interested in the link route */ 2413 } 2414 /* do not look at cloned routes */ 2415 #ifdef RTF_WASCLONED 2416 if (rtm->rtm_flags & RTF_WASCLONED) 2417 return; 2418 #endif 2419 #ifdef RTF_CLONED 2420 if (rtm->rtm_flags & RTF_CLONED) 2421 return; 2422 #endif 2423 /* 2424 * do not look at dynamic routes. 2425 * netbsd/openbsd cloned routes have UGHD. 2426 */ 2427 if (rtm->rtm_flags & RTF_DYNAMIC) 2428 return; 2429 rtmp = (char *)(rtm + 1); 2430 /* Destination */ 2431 if ((rtm->rtm_addrs & RTA_DST) == 0) 2432 return; /* ignore routes without destination address */ 2433 sin6_dst = (struct sockaddr_in6 *)rtmp; 2434 rtmp += ROUNDUP(sin6_dst->sin6_len); 2435 if (rtm->rtm_addrs & RTA_GATEWAY) { 2436 sin6_gw = (struct sockaddr_in6 *)rtmp; 2437 rtmp += ROUNDUP(sin6_gw->sin6_len); 2438 } 2439 if (rtm->rtm_addrs & RTA_NETMASK) { 2440 sin6_mask = (struct sockaddr_in6 *)rtmp; 2441 rtmp += ROUNDUP(sin6_mask->sin6_len); 2442 } 2443 if (rtm->rtm_addrs & RTA_GENMASK) { 2444 sin6_genmask = (struct sockaddr_in6 *)rtmp; 2445 rtmp += ROUNDUP(sin6_genmask->sin6_len); 2446 } 2447 if (rtm->rtm_addrs & RTA_IFP) { 2448 sin6_ifp = (struct sockaddr_in6 *)rtmp; 2449 rtmp += ROUNDUP(sin6_ifp->sin6_len); 2450 } 2451 2452 /* Destination */ 2453 if (sin6_dst->sin6_family != AF_INET6) 2454 return; 2455 if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr)) 2456 return; /* Link-local */ 2457 if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback)) 2458 return; /* Loopback */ 2459 if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr)) 2460 return; 2461 2462 if ((rrt = MALLOC(struct riprt)) == NULL) { 2463 fatal("malloc: struct riprt"); 2464 } 2465 memset(rrt, 0, sizeof(*rrt)); 2466 np = &rrt->rrt_info; 2467 rrt->rrt_same = NULL; 2468 rrt->rrt_t = time(NULL); 2469 if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC)) 2470 rrt->rrt_t = 0; /* Don't age static routes */ 2471 if ((rtm->rtm_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST) 2472 rrt->rrt_t = 0; /* Don't age non-gateway host routes */ 2473 np->rip6_tag = 0; 2474 np->rip6_metric = rtm->rtm_rmx.rmx_hopcount; 2475 if (np->rip6_metric < 1) 2476 np->rip6_metric = 1; 2477 rrt->rrt_flags = rtm->rtm_flags; 2478 np->rip6_dest = sin6_dst->sin6_addr; 2479 2480 /* Mask or plen */ 2481 if (rtm->rtm_flags & RTF_HOST) 2482 np->rip6_plen = 128; /* Host route */ 2483 else if (sin6_mask) 2484 np->rip6_plen = sin6mask2len(sin6_mask); 2485 else 2486 np->rip6_plen = 0; 2487 2488 orrt = rtsearch(np, NULL); 2489 if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) { 2490 /* Already found */ 2491 if (!again) { 2492 trace(1, "route: %s/%d flags %s: already registered\n", 2493 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2494 rtflags(rtm)); 2495 } 2496 free(rrt); 2497 return; 2498 } 2499 /* Gateway */ 2500 if (!sin6_gw) 2501 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2502 else { 2503 if (sin6_gw->sin6_family == AF_INET6) 2504 rrt->rrt_gw = sin6_gw->sin6_addr; 2505 else if (sin6_gw->sin6_family == AF_LINK) { 2506 /* XXX in case ppp link? */ 2507 rrt->rrt_gw = in6addr_loopback; 2508 } else 2509 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2510 } 2511 trace(1, "route: %s/%d flags %s", 2512 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm)); 2513 trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw)); 2514 2515 /* Interface */ 2516 s = rtm->rtm_index; 2517 if (s < nindex2ifc && index2ifc[s]) 2518 ifname = index2ifc[s]->ifc_name; 2519 else { 2520 trace(1, " not configured\n"); 2521 free(rrt); 2522 return; 2523 } 2524 trace(1, " if %s sock %d", ifname, s); 2525 rrt->rrt_index = s; 2526 2527 trace(1, "\n"); 2528 2529 /* Check gateway */ 2530 if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) && 2531 !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) { 2532 trace(0, "***** Gateway %s is not a link-local address.\n", 2533 inet6_n2p(&rrt->rrt_gw)); 2534 trace(0, "***** dest(%s) if(%s) -- Not optimized.\n", 2535 inet6_n2p(&rrt->rrt_info.rip6_dest), ifname); 2536 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR; 2537 } 2538 2539 /* Put it to the route list */ 2540 if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) { 2541 /* replace route list */ 2542 rrt->rrt_next = orrt->rrt_next; 2543 *orrt = *rrt; 2544 trace(1, "route: %s/%d flags %s: replace new route\n", 2545 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2546 rtflags(rtm)); 2547 free(rrt); 2548 } else { 2549 rrt->rrt_next = riprt; 2550 riprt = rrt; 2551 } 2552 } 2553 2554 static int 2555 addroute(struct riprt *rrt, const struct in6_addr *gw, struct ifc *ifcp) 2556 { 2557 struct netinfo6 *np; 2558 u_char buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ]; 2559 struct rt_msghdr *rtm; 2560 struct sockaddr_in6 *sin6; 2561 int len; 2562 2563 np = &rrt->rrt_info; 2564 inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1)); 2565 inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2)); 2566 tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n", 2567 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2568 np->rip6_metric - 1, buf2); 2569 if (rtlog) 2570 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(), 2571 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2572 np->rip6_metric - 1, buf2); 2573 if (nflag) 2574 return 0; 2575 2576 memset(buf, 0, sizeof(buf)); 2577 rtm = (struct rt_msghdr *)buf; 2578 rtm->rtm_type = RTM_ADD; 2579 rtm->rtm_version = RTM_VERSION; 2580 rtm->rtm_seq = ++seq; 2581 rtm->rtm_pid = pid; 2582 rtm->rtm_flags = rrt->rrt_flags; 2583 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2584 rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1; 2585 rtm->rtm_inits = RTV_HOPCOUNT; 2586 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2587 /* Destination */ 2588 sin6->sin6_len = sizeof(struct sockaddr_in6); 2589 sin6->sin6_family = AF_INET6; 2590 sin6->sin6_addr = np->rip6_dest; 2591 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2592 /* Gateway */ 2593 sin6->sin6_len = sizeof(struct sockaddr_in6); 2594 sin6->sin6_family = AF_INET6; 2595 sin6->sin6_addr = *gw; 2596 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2597 /* Netmask */ 2598 sin6->sin6_len = sizeof(struct sockaddr_in6); 2599 sin6->sin6_family = AF_INET6; 2600 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2601 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2602 2603 len = (char *)sin6 - (char *)buf; 2604 rtm->rtm_msglen = len; 2605 if (write(rtsock, buf, len) > 0) 2606 return 0; 2607 2608 if (errno == EEXIST) { 2609 trace(0, "ADD: Route already exists %s/%d gw %s\n", 2610 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2611 if (rtlog) 2612 fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n", 2613 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2614 } else { 2615 trace(0, "Can not write to rtsock (addroute): %s\n", 2616 strerror(errno)); 2617 if (rtlog) 2618 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2619 strerror(errno)); 2620 } 2621 return -1; 2622 } 2623 2624 static int 2625 delroute(struct netinfo6 *np, struct in6_addr *gw) 2626 { 2627 u_char buf[BUFSIZ], buf2[BUFSIZ]; 2628 struct rt_msghdr *rtm; 2629 struct sockaddr_in6 *sin6; 2630 int len; 2631 2632 inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2)); 2633 tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest), 2634 np->rip6_plen, buf2); 2635 if (rtlog) 2636 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n", 2637 hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2638 if (nflag) 2639 return 0; 2640 2641 memset(buf, 0, sizeof(buf)); 2642 rtm = (struct rt_msghdr *)buf; 2643 rtm->rtm_type = RTM_DELETE; 2644 rtm->rtm_version = RTM_VERSION; 2645 rtm->rtm_seq = ++seq; 2646 rtm->rtm_pid = pid; 2647 rtm->rtm_flags = RTF_UP | RTF_GATEWAY; 2648 if (np->rip6_plen == sizeof(struct in6_addr) * 8) 2649 rtm->rtm_flags |= RTF_HOST; 2650 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2651 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2652 /* Destination */ 2653 sin6->sin6_len = sizeof(struct sockaddr_in6); 2654 sin6->sin6_family = AF_INET6; 2655 sin6->sin6_addr = np->rip6_dest; 2656 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2657 /* Gateway */ 2658 sin6->sin6_len = sizeof(struct sockaddr_in6); 2659 sin6->sin6_family = AF_INET6; 2660 sin6->sin6_addr = *gw; 2661 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2662 /* Netmask */ 2663 sin6->sin6_len = sizeof(struct sockaddr_in6); 2664 sin6->sin6_family = AF_INET6; 2665 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2666 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2667 2668 len = (char *)sin6 - (char *)buf; 2669 rtm->rtm_msglen = len; 2670 if (write(rtsock, buf, len) >= 0) 2671 return 0; 2672 2673 if (errno == ESRCH) { 2674 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n", 2675 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2676 if (rtlog) 2677 fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n", 2678 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2679 } else { 2680 trace(0, "Can not write to rtsock (delroute): %s\n", 2681 strerror(errno)); 2682 if (rtlog) 2683 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2684 strerror(errno)); 2685 } 2686 return -1; 2687 } 2688 2689 static const char * 2690 inet6_n2p(const struct in6_addr *p) 2691 { 2692 static char buf[BUFSIZ]; 2693 2694 return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf)); 2695 } 2696 2697 static void 2698 ifrtdump(int sig) 2699 { 2700 2701 ifdump(sig); 2702 rtdump(sig); 2703 } 2704 2705 static void 2706 ifdump(int sig) 2707 { 2708 struct ifc *ifcp; 2709 FILE *dump; 2710 int i; 2711 2712 if (sig == 0) 2713 dump = stderr; 2714 else 2715 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 2716 dump = stderr; 2717 2718 fprintf(dump, "%s: Interface Table Dump\n", hms()); 2719 fprintf(dump, " Number of interfaces: %d\n", nifc); 2720 for (i = 0; i < 2; i++) { 2721 fprintf(dump, " %sadvertising interfaces:\n", i ? "non-" : ""); 2722 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 2723 if (i == 0) { 2724 if ((ifcp->ifc_flags & IFF_UP) == 0) 2725 continue; 2726 if (iff_find(ifcp, 'N') != NULL) 2727 continue; 2728 } else { 2729 if (ifcp->ifc_flags & IFF_UP) 2730 continue; 2731 } 2732 ifdump0(dump, ifcp); 2733 } 2734 } 2735 fprintf(dump, "\n"); 2736 if (dump != stderr) 2737 fclose(dump); 2738 } 2739 2740 static void 2741 ifdump0(FILE *dump, const struct ifc *ifcp) 2742 { 2743 struct ifac *ifa; 2744 struct iff *iffp; 2745 char buf[BUFSIZ]; 2746 const char *ft; 2747 int addr; 2748 2749 fprintf(dump, " %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n", 2750 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags), 2751 inet6_n2p(&ifcp->ifc_mylladdr), 2752 ifcp->ifc_mtu, ifcp->ifc_metric); 2753 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2754 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 2755 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, 2756 buf, sizeof(buf)); 2757 fprintf(dump, "\t%s/%d -- %s\n", 2758 inet6_n2p(&ifa->ifa_addr), 2759 ifa->ifa_plen, buf); 2760 } else { 2761 fprintf(dump, "\t%s/%d\n", 2762 inet6_n2p(&ifa->ifa_addr), 2763 ifa->ifa_plen); 2764 } 2765 } 2766 if (ifcp->ifc_filter) { 2767 fprintf(dump, "\tFilter:"); 2768 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 2769 addr = 0; 2770 switch (iffp->iff_type) { 2771 case 'A': 2772 ft = "Aggregate"; addr++; break; 2773 case 'N': 2774 ft = "No-use"; break; 2775 case 'O': 2776 ft = "Advertise-only"; addr++; break; 2777 case 'T': 2778 ft = "Default-only"; break; 2779 case 'L': 2780 ft = "Listen-only"; addr++; break; 2781 default: 2782 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type); 2783 ft = buf; 2784 addr++; 2785 break; 2786 } 2787 fprintf(dump, " %s", ft); 2788 if (addr) { 2789 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr), 2790 iffp->iff_plen); 2791 } 2792 } 2793 fprintf(dump, "\n"); 2794 } 2795 } 2796 2797 static void 2798 rtdump(int sig) 2799 { 2800 struct riprt *rrt; 2801 char buf[BUFSIZ]; 2802 FILE *dump; 2803 time_t t, age; 2804 2805 if (sig == 0) 2806 dump = stderr; 2807 else 2808 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 2809 dump = stderr; 2810 2811 t = time(NULL); 2812 fprintf(dump, "\n%s: Routing Table Dump\n", hms()); 2813 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 2814 if (rrt->rrt_t == 0) 2815 age = 0; 2816 else 2817 age = t - rrt->rrt_t; 2818 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest, 2819 buf, sizeof(buf)); 2820 fprintf(dump, " %s/%d if(%d:%s) gw(%s) [%d] age(%ld)", 2821 buf, rrt->rrt_info.rip6_plen, rrt->rrt_index, 2822 index2ifc[rrt->rrt_index]->ifc_name, 2823 inet6_n2p(&rrt->rrt_gw), 2824 rrt->rrt_info.rip6_metric, (long)age); 2825 if (rrt->rrt_info.rip6_tag) { 2826 fprintf(dump, " tag(0x%04x)", 2827 ntohs(rrt->rrt_info.rip6_tag) & 0xffff); 2828 } 2829 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) 2830 fprintf(dump, " NOT-LL"); 2831 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 2832 fprintf(dump, " NO-ADV"); 2833 fprintf(dump, "\n"); 2834 } 2835 fprintf(dump, "\n"); 2836 if (dump != stderr) 2837 fclose(dump); 2838 } 2839 2840 /* 2841 * Parse the -A (and -O) options and put corresponding filter object to the 2842 * specified interface structures. Each of the -A/O option has the following 2843 * syntax: -A 5f09:c400::/32,ef0,ef1 (aggregate) 2844 * -O 5f09:c400::/32,ef0,ef1 (only when match) 2845 */ 2846 static void 2847 filterconfig(void) 2848 { 2849 int i; 2850 char *p, *ap, *iflp, *ifname, *ep; 2851 struct iff ftmp, *iff_obj; 2852 struct ifc *ifcp; 2853 struct riprt *rrt; 2854 #if 0 2855 struct in6_addr gw; 2856 #endif 2857 u_long plen; 2858 2859 for (i = 0; i < nfilter; i++) { 2860 ap = filter[i]; 2861 iflp = NULL; 2862 ifcp = NULL; 2863 if (filtertype[i] == 'N' || filtertype[i] == 'T') { 2864 iflp = ap; 2865 goto ifonly; 2866 } 2867 if ((p = strchr(ap, ',')) != NULL) { 2868 *p++ = '\0'; 2869 iflp = p; 2870 } 2871 if ((p = strchr(ap, '/')) == NULL) { 2872 fatal("no prefixlen specified for '%s'", ap); 2873 } 2874 *p++ = '\0'; 2875 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) { 2876 fatal("invalid prefix specified for '%s'", ap); 2877 } 2878 errno = 0; 2879 ep = NULL; 2880 plen = strtoul(p, &ep, 10); 2881 if (errno || !*p || *ep || plen > sizeof(ftmp.iff_addr) * 8) { 2882 fatal("invalid prefix length specified for '%s'", ap); 2883 } 2884 ftmp.iff_plen = plen; 2885 ftmp.iff_next = NULL; 2886 applyplen(&ftmp.iff_addr, ftmp.iff_plen); 2887 ifonly: 2888 ftmp.iff_type = filtertype[i]; 2889 if (iflp == NULL || *iflp == '\0') { 2890 fatal("no interface specified for '%s'", ap); 2891 } 2892 /* parse the interface listing portion */ 2893 while (iflp) { 2894 ifname = iflp; 2895 if ((iflp = strchr(iflp, ',')) != NULL) 2896 *iflp++ = '\0'; 2897 ifcp = ifc_find(ifname); 2898 if (ifcp == NULL) { 2899 fatal("no interface %s exists", ifname); 2900 } 2901 iff_obj = malloc(sizeof(struct iff)); 2902 if (iff_obj == NULL) { 2903 fatal("malloc of iff_obj"); 2904 } 2905 memcpy((void *)iff_obj, (void *)&ftmp, 2906 sizeof(struct iff)); 2907 /* link it to the interface filter */ 2908 iff_obj->iff_next = ifcp->ifc_filter; 2909 ifcp->ifc_filter = iff_obj; 2910 } 2911 2912 /* 2913 * -A: aggregate configuration. 2914 */ 2915 if (filtertype[i] != 'A') 2916 continue; 2917 /* put the aggregate to the kernel routing table */ 2918 rrt = malloc(sizeof(struct riprt)); 2919 if (rrt == NULL) { 2920 fatal("malloc: rrt"); 2921 } 2922 memset(rrt, 0, sizeof(struct riprt)); 2923 rrt->rrt_info.rip6_dest = ftmp.iff_addr; 2924 rrt->rrt_info.rip6_plen = ftmp.iff_plen; 2925 rrt->rrt_info.rip6_metric = 1; 2926 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2927 rrt->rrt_gw = in6addr_loopback; 2928 rrt->rrt_flags = RTF_UP | RTF_REJECT; 2929 rrt->rrt_rflags = RRTF_AGGREGATE; 2930 rrt->rrt_t = 0; 2931 rrt->rrt_index = loopifcp->ifc_index; 2932 #if 0 2933 if (getroute(&rrt->rrt_info, &gw)) { 2934 #if 0 2935 /* 2936 * When the address has already been registered in the 2937 * kernel routing table, it should be removed 2938 */ 2939 delroute(&rrt->rrt_info, &gw); 2940 #else 2941 /* it is safer behavior */ 2942 errno = EINVAL; 2943 fatal("%s/%u already in routing table, " 2944 "cannot aggregate", 2945 inet6_n2p(&rrt->rrt_info.rip6_dest), 2946 rrt->rrt_info.rip6_plen); 2947 #endif 2948 } 2949 #endif 2950 /* Put the route to the list */ 2951 rrt->rrt_next = riprt; 2952 riprt = rrt; 2953 trace(1, "Aggregate: %s/%d for %s\n", 2954 inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen, 2955 ifcp->ifc_name); 2956 /* Add this route to the kernel */ 2957 if (nflag) /* do not modify kernel routing table */ 2958 continue; 2959 addroute(rrt, &in6addr_loopback, loopifcp); 2960 } 2961 } 2962 2963 /***************** utility functions *****************/ 2964 2965 /* 2966 * Returns a pointer to ifac whose address and prefix length matches 2967 * with the address and prefix length specified in the arguments. 2968 */ 2969 static struct ifac * 2970 ifa_match(const struct ifc *ifcp, const struct in6_addr *ia, int plen) 2971 { 2972 struct ifac *ifa; 2973 2974 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2975 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) && 2976 ifa->ifa_plen == plen) 2977 break; 2978 } 2979 return ifa; 2980 } 2981 2982 /* 2983 * Return a pointer to riprt structure whose address and prefix length 2984 * matches with the address and prefix length found in the argument. 2985 * Note: This is not a rtalloc(). Therefore exact match is necessary. 2986 */ 2987 static struct riprt * 2988 rtsearch(struct netinfo6 *np, struct riprt **prev_rrt) 2989 { 2990 struct riprt *rrt; 2991 2992 if (prev_rrt) 2993 *prev_rrt = NULL; 2994 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 2995 if (rrt->rrt_info.rip6_plen == np->rip6_plen && 2996 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 2997 &np->rip6_dest)) 2998 return rrt; 2999 if (prev_rrt) 3000 *prev_rrt = rrt; 3001 } 3002 if (prev_rrt) 3003 *prev_rrt = NULL; 3004 return 0; 3005 } 3006 3007 static int 3008 sin6mask2len(const struct sockaddr_in6 *sin6) 3009 { 3010 3011 return mask2len(&sin6->sin6_addr, 3012 sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr)); 3013 } 3014 3015 static int 3016 mask2len(const struct in6_addr *addr, int lenlim) 3017 { 3018 int i = 0, j; 3019 const u_char *p = (const u_char *)addr; 3020 3021 for (j = 0; j < lenlim; j++, p++) { 3022 if (*p != 0xff) 3023 break; 3024 i += 8; 3025 } 3026 if (j < lenlim) { 3027 switch (*p) { 3028 #define MASKLEN(m, l) case m: do { i += l; break; } while (0) 3029 MASKLEN(0xfe, 7); break; 3030 MASKLEN(0xfc, 6); break; 3031 MASKLEN(0xf8, 5); break; 3032 MASKLEN(0xf0, 4); break; 3033 MASKLEN(0xe0, 3); break; 3034 MASKLEN(0xc0, 2); break; 3035 MASKLEN(0x80, 1); break; 3036 #undef MASKLEN 3037 } 3038 } 3039 return i; 3040 } 3041 3042 static const u_char plent[8] = { 3043 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe 3044 }; 3045 3046 static void 3047 applyplen(struct in6_addr *ia, int plen) 3048 { 3049 u_char *p; 3050 int i; 3051 3052 p = ia->s6_addr; 3053 for (i = 0; i < 16; i++) { 3054 if (plen <= 0) 3055 *p = 0; 3056 else if (plen < 8) 3057 *p &= plent[plen]; 3058 p++, plen -= 8; 3059 } 3060 } 3061 3062 static const int pl2m[9] = { 3063 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff 3064 }; 3065 3066 static struct in6_addr * 3067 plen2mask(int n) 3068 { 3069 static struct in6_addr ia; 3070 u_char *p; 3071 int i; 3072 3073 memset(&ia, 0, sizeof(struct in6_addr)); 3074 p = (u_char *)&ia; 3075 for (i = 0; i < 16; i++, p++, n -= 8) { 3076 if (n >= 8) { 3077 *p = 0xff; 3078 continue; 3079 } 3080 *p = pl2m[n]; 3081 break; 3082 } 3083 return &ia; 3084 } 3085 3086 static char * 3087 xstrdup(char *p) 3088 { 3089 char *buf = strdup(p); 3090 if (buf == NULL) { 3091 fatal("strdup"); 3092 } 3093 return buf; 3094 } 3095 3096 static char * 3097 hms(void) 3098 { 3099 static char buf[BUFSIZ]; 3100 time_t t; 3101 struct tm *tm; 3102 3103 t = time(NULL); 3104 if ((tm = localtime(&t)) == 0) { 3105 fatal("localtime"); 3106 } 3107 snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min, 3108 tm->tm_sec); 3109 return buf; 3110 } 3111 3112 #define RIPRANDDEV 1.0 /* 30 +- 15, max - min = 30 */ 3113 3114 static int 3115 ripinterval(int timer) 3116 { 3117 double r = rand(); 3118 3119 interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5)); 3120 nextalarm = time(NULL) + interval; 3121 return interval; 3122 } 3123 3124 static void 3125 fatal(const char *fmt, ...) 3126 { 3127 va_list ap; 3128 char buf[1024]; 3129 3130 va_start(ap, fmt); 3131 vsnprintf(buf, sizeof(buf), fmt, ap); 3132 va_end(ap); 3133 perror(buf); 3134 if (errno) 3135 syslog(LOG_ERR, "%s: %s", buf, strerror(errno)); 3136 else 3137 syslog(LOG_ERR, "%s", buf); 3138 rtdexit(); 3139 } 3140 3141 static void 3142 tracet(int level, const char *fmt, ...) 3143 { 3144 va_list ap; 3145 3146 if (level <= dflag) { 3147 va_start(ap, fmt); 3148 fprintf(stderr, "%s: ", hms()); 3149 vfprintf(stderr, fmt, ap); 3150 va_end(ap); 3151 } 3152 if (dflag) { 3153 va_start(ap, fmt); 3154 if (level > 0) 3155 vsyslog(LOG_DEBUG, fmt, ap); 3156 else 3157 vsyslog(LOG_WARNING, fmt, ap); 3158 va_end(ap); 3159 } 3160 } 3161 3162 static void 3163 trace(int level, const char *fmt, ...) 3164 { 3165 va_list ap; 3166 3167 if (level <= dflag) { 3168 va_start(ap, fmt); 3169 vfprintf(stderr, fmt, ap); 3170 va_end(ap); 3171 } 3172 if (dflag) { 3173 va_start(ap, fmt); 3174 if (level > 0) 3175 vsyslog(LOG_DEBUG, fmt, ap); 3176 else 3177 vsyslog(LOG_WARNING, fmt, ap); 3178 va_end(ap); 3179 } 3180 } 3181 3182 static struct ifc * 3183 ifc_find(char *name) 3184 { 3185 struct ifc *ifcp; 3186 3187 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 3188 if (strcmp(name, ifcp->ifc_name) == 0) 3189 return ifcp; 3190 } 3191 return NULL; 3192 } 3193 3194 static struct iff * 3195 iff_find(struct ifc *ifcp, int type) 3196 { 3197 struct iff *iffp; 3198 3199 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 3200 if (iffp->iff_type == type) 3201 return iffp; 3202 } 3203 return NULL; 3204 } 3205 3206 static void 3207 setindex2ifc(int idx, struct ifc *ifcp) 3208 { 3209 int n, nsize; 3210 struct ifc **p; 3211 3212 if (!index2ifc) { 3213 nindex2ifc = 5; /*initial guess*/ 3214 index2ifc = malloc(sizeof(*index2ifc) * nindex2ifc); 3215 if (index2ifc == NULL) { 3216 fatal("malloc"); 3217 } 3218 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc); 3219 } 3220 n = nindex2ifc; 3221 for (nsize = nindex2ifc; nsize <= idx; nsize *= 2) 3222 ; 3223 if (n != nsize) { 3224 p = (struct ifc **)realloc(index2ifc, 3225 sizeof(*index2ifc) * nsize); 3226 if (p == NULL) { 3227 fatal("realloc"); 3228 } 3229 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n)); 3230 index2ifc = p; 3231 nindex2ifc = nsize; 3232 } 3233 index2ifc[idx] = ifcp; 3234 } 3235
Indexes created Wed Oct 22 06:10:02 GMT 2025