1 /* $NetBSD: route6d.c,v 1.32 2002/02/25 02:22:59 itojun Exp $ */ 2 /* $KAME: route6d.c,v 1.80 2002/02/24 07:10:10 suz 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 1.32 2002/02/25 02:22:59 itojun Exp $"); 36 #endif 37 38 #include <stdio.h> 39 40 #include <time.h> 41 #include <unistd.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <signal.h> 45 #ifdef __STDC__ 46 #include <stdarg.h> 47 #else 48 #include <varargs.h> 49 #endif 50 #include <syslog.h> 51 #include <stddef.h> 52 #include <errno.h> 53 #include <err.h> 54 55 #include <sys/types.h> 56 #include <sys/param.h> 57 #include <sys/file.h> 58 #include <sys/socket.h> 59 #include <sys/ioctl.h> 60 #include <sys/sysctl.h> 61 #include <sys/uio.h> 62 #include <net/if.h> 63 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 64 #include <net/if_var.h> 65 #endif /* __FreeBSD__ >= 3 */ 66 #define KERNEL 1 67 #define _KERNEL 1 68 #include <net/route.h> 69 #undef KERNEL 70 #undef _KERNEL 71 #include <netinet/in.h> 72 #include <netinet/in_var.h> 73 #include <netinet/ip6.h> 74 #include <netinet/udp.h> 75 #include <netdb.h> 76 #include <ifaddrs.h> 77 78 #include <arpa/inet.h> 79 80 #include "route6d.h" 81 82 #define MAXFILTER 40 83 84 #ifdef DEBUG 85 #define INIT_INTERVAL6 6 86 #else 87 #define INIT_INTERVAL6 10 /* Wait to submit a initial riprequest */ 88 #endif 89 90 /* alignment constraint for routing socket */ 91 #define ROUNDUP(a) \ 92 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 93 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 94 95 /* 96 * Following two macros are highly depending on KAME Release 97 */ 98 #define IN6_LINKLOCAL_IFINDEX(addr) \ 99 ((addr).s6_addr[2] << 8 | (addr).s6_addr[3]) 100 101 #define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \ 102 do { \ 103 (addr).s6_addr[2] = ((index) >> 8) & 0xff; \ 104 (addr).s6_addr[3] = (index) & 0xff; \ 105 } while (0) 106 107 struct ifc { /* Configuration of an interface */ 108 char *ifc_name; /* if name */ 109 struct ifc *ifc_next; 110 int ifc_index; /* if index */ 111 int ifc_mtu; /* if mtu */ 112 int ifc_metric; /* if metric */ 113 u_int ifc_flags; /* flags */ 114 short ifc_cflags; /* IFC_XXX */ 115 struct in6_addr ifc_mylladdr; /* my link-local address */ 116 struct sockaddr_in6 ifc_ripsin; /* rip multicast address */ 117 struct iff *ifc_filter; /* filter structure */ 118 struct ifac *ifc_addr; /* list of AF_INET6 addresses */ 119 int ifc_joined; /* joined to ff02::9 */ 120 }; 121 122 struct ifac { /* Adddress associated to an interface */ 123 struct ifc *ifa_conf; /* back pointer */ 124 struct ifac *ifa_next; 125 struct in6_addr ifa_addr; /* address */ 126 struct in6_addr ifa_raddr; /* remote address, valid in p2p */ 127 int ifa_plen; /* prefix length */ 128 }; 129 130 struct iff { 131 int iff_type; 132 struct in6_addr iff_addr; 133 int iff_plen; 134 struct iff *iff_next; 135 }; 136 137 struct ifc *ifc; 138 int nifc; /* number of valid ifc's */ 139 struct ifc **index2ifc; 140 int nindex2ifc; 141 struct ifc *loopifcp = NULL; /* pointing to loopback */ 142 fd_set sockvec; /* vector to select() for receiving */ 143 int rtsock; /* the routing socket */ 144 int ripsock; /* socket to send/receive RIP datagram */ 145 int maxfd; /* maximum fd for select() */ 146 147 struct rip6 *ripbuf; /* packet buffer for sending */ 148 149 /* 150 * Maintain the routes in a linked list. When the number of the routes 151 * grows, somebody would like to introduce a hash based or a radix tree 152 * based structure. I believe the number of routes handled by RIP is 153 * limited and I don't have to manage a complex data structure, however. 154 * 155 * One of the major drawbacks of the linear linked list is the difficulty 156 * of representing the relationship between a couple of routes. This may 157 * be a significant problem when we have to support route aggregation with 158 * supressing the specifices covered by the aggregate. 159 */ 160 161 struct riprt { 162 struct riprt *rrt_next; /* next destination */ 163 struct riprt *rrt_same; /* same destination - future use */ 164 struct netinfo6 rrt_info; /* network info */ 165 struct in6_addr rrt_gw; /* gateway */ 166 u_long rrt_flags; /* kernel routing table flags */ 167 u_long rrt_rflags; /* route6d routing table flags */ 168 time_t rrt_t; /* when the route validated */ 169 int rrt_index; /* ifindex from which this route got */ 170 }; 171 172 struct riprt *riprt = 0; 173 174 int dflag = 0; /* debug flag */ 175 int qflag = 0; /* quiet flag */ 176 int nflag = 0; /* don't update kernel routing table */ 177 int aflag = 0; /* age out even the statically defined routes */ 178 int hflag = 0; /* don't split horizon */ 179 int lflag = 0; /* exchange site local routes */ 180 int sflag = 0; /* announce static routes w/ split horizon */ 181 int Sflag = 0; /* announce static routes to every interface */ 182 unsigned long routetag = 0; /* route tag attached on originating case */ 183 184 char *filter[MAXFILTER]; 185 int filtertype[MAXFILTER]; 186 int nfilter = 0; 187 188 pid_t pid; 189 190 struct sockaddr_storage ripsin; 191 192 struct rtentry rtentry; 193 194 int interval = 1; 195 time_t nextalarm = 0; 196 time_t sup_trig_update = 0; 197 198 FILE *rtlog = NULL; 199 200 int logopened = 0; 201 202 static u_long seq = 0; 203 204 volatile int signo; 205 volatile sig_atomic_t seenalrm; 206 volatile sig_atomic_t seenquit; 207 volatile sig_atomic_t seenusr1; 208 209 #define RRTF_AGGREGATE 0x08000000 210 #define RRTF_NOADVERTISE 0x10000000 211 #define RRTF_NH_NOT_LLADDR 0x20000000 212 #define RRTF_SENDANYWAY 0x40000000 213 #define RRTF_CHANGED 0x80000000 214 215 int main __P((int, char **)); 216 void sighandler __P((int)); 217 void ripalarm __P((void)); 218 void riprecv __P((void)); 219 void ripsend __P((struct ifc *, struct sockaddr_in6 *, int)); 220 int out_filter __P((struct riprt *, struct ifc *)); 221 void init __P((void)); 222 void sockopt __P((struct ifc *)); 223 void ifconfig __P((void)); 224 void ifconfig1 __P((const char *, const struct sockaddr *, struct ifc *, int)); 225 void rtrecv __P((void)); 226 int rt_del __P((const struct sockaddr_in6 *, const struct sockaddr_in6 *, 227 const struct sockaddr_in6 *)); 228 int rt_deladdr __P((struct ifc *, const struct sockaddr_in6 *, 229 const struct sockaddr_in6 *)); 230 void filterconfig __P((void)); 231 int getifmtu __P((int)); 232 const char *rttypes __P((struct rt_msghdr *)); 233 const char *rtflags __P((struct rt_msghdr *)); 234 const char *ifflags __P((int)); 235 int ifrt __P((struct ifc *, int)); 236 void ifrt_p2p __P((struct ifc *, int)); 237 void applymask __P((struct in6_addr *, struct in6_addr *)); 238 void applyplen __P((struct in6_addr *, int)); 239 void ifrtdump __P((int)); 240 void ifdump __P((int)); 241 void ifdump0 __P((FILE *, const struct ifc *)); 242 void rtdump __P((int)); 243 void rt_entry __P((struct rt_msghdr *, int)); 244 void rtdexit __P((void)); 245 void riprequest __P((struct ifc *, struct netinfo6 *, int, 246 struct sockaddr_in6 *)); 247 void ripflush __P((struct ifc *, struct sockaddr_in6 *)); 248 void sendrequest __P((struct ifc *)); 249 int sin6mask2len __P((const struct sockaddr_in6 *)); 250 int mask2len __P((const struct in6_addr *, int)); 251 int sendpacket __P((struct sockaddr_in6 *, int)); 252 int addroute __P((struct riprt *, const struct in6_addr *, struct ifc *)); 253 int delroute __P((struct netinfo6 *, struct in6_addr *)); 254 struct in6_addr *getroute __P((struct netinfo6 *, struct in6_addr *)); 255 void krtread __P((int)); 256 int tobeadv __P((struct riprt *, struct ifc *)); 257 char *allocopy __P((char *)); 258 char *hms __P((void)); 259 const char *inet6_n2p __P((const struct in6_addr *)); 260 struct ifac *ifa_match __P((const struct ifc *, const struct in6_addr *, int)); 261 struct in6_addr *plen2mask __P((int)); 262 struct riprt *rtsearch __P((struct netinfo6 *, struct riprt **)); 263 int ripinterval __P((int)); 264 time_t ripsuptrig __P((void)); 265 void fatal __P((const char *, ...)) 266 __attribute__((__format__(__printf__, 1, 2))); 267 void trace __P((int, const char *, ...)) 268 __attribute__((__format__(__printf__, 2, 3))); 269 void tracet __P((int, const char *, ...)) 270 __attribute__((__format__(__printf__, 2, 3))); 271 unsigned int if_maxindex __P((void)); 272 struct ifc *ifc_find __P((char *)); 273 struct iff *iff_find __P((struct ifc *, int)); 274 void setindex2ifc __P((int, struct ifc *)); 275 276 #define MALLOC(type) ((type *)malloc(sizeof(type))) 277 278 int 279 main(argc, argv) 280 int argc; 281 char **argv; 282 { 283 int ch; 284 int error = 0; 285 struct ifc *ifcp; 286 sigset_t mask, omask; 287 FILE *pidfile; 288 char *progname; 289 char *ep; 290 291 progname = strrchr(*argv, '/'); 292 if (progname) 293 progname++; 294 else 295 progname = *argv; 296 297 pid = getpid(); 298 while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) { 299 switch (ch) { 300 case 'A': 301 case 'N': 302 case 'O': 303 case 'T': 304 case 'L': 305 if (nfilter >= MAXFILTER) { 306 fatal("Exceeds MAXFILTER"); 307 /*NOTREACHED*/ 308 } 309 filtertype[nfilter] = ch; 310 filter[nfilter++] = allocopy(optarg); 311 break; 312 case 't': 313 ep = NULL; 314 routetag = strtoul(optarg, &ep, 0); 315 if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) { 316 fatal("invalid route tag"); 317 /*NOTREACHED*/ 318 } 319 break; 320 case 'R': 321 if ((rtlog = fopen(optarg, "w")) == NULL) { 322 fatal("Can not write to routelog"); 323 /*NOTREACHED*/ 324 } 325 break; 326 #define FLAG(c, flag, n) case c: do { flag = n; break; } while(0) 327 FLAG('a', aflag, 1); break; 328 FLAG('d', dflag, 1); break; 329 FLAG('D', dflag, 2); break; 330 FLAG('h', hflag, 1); break; 331 FLAG('l', lflag, 1); break; 332 FLAG('n', nflag, 1); break; 333 FLAG('q', qflag, 1); break; 334 FLAG('s', sflag, 1); break; 335 FLAG('S', Sflag, 1); break; 336 #undef FLAG 337 default: 338 fatal("Invalid option specified, terminating"); 339 /*NOTREACHED*/ 340 } 341 } 342 argc -= optind; 343 argv += optind; 344 if (argc > 0) { 345 fatal("bogus extra arguments"); 346 /*NOTREACHED*/ 347 } 348 349 if (geteuid()) { 350 nflag = 1; 351 fprintf(stderr, "No kernel update is allowed\n"); 352 } 353 354 if (dflag == 0) { 355 if (daemon(0, 0) < 0) { 356 fatal("daemon"); 357 /*NOTREACHED*/ 358 } 359 } 360 361 openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON); 362 logopened++; 363 364 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) 365 fatal("malloc"); 366 memset(ripbuf, 0, RIP6_MAXMTU); 367 ripbuf->rip6_cmd = RIP6_RESPONSE; 368 ripbuf->rip6_vers = RIP6_VERSION; 369 ripbuf->rip6_res1[0] = 0; 370 ripbuf->rip6_res1[1] = 0; 371 372 init(); 373 ifconfig(); 374 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 375 if (ifcp->ifc_index < 0) { 376 fprintf(stderr, 377 "No ifindex found at %s (no link-local address?)\n", 378 ifcp->ifc_name); 379 error++; 380 } 381 } 382 if (error) 383 exit(1); 384 if (loopifcp == NULL) { 385 fatal("No loopback found"); 386 /*NOTREACHED*/ 387 } 388 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 389 ifrt(ifcp, 0); 390 filterconfig(); 391 krtread(0); 392 if (dflag) 393 ifrtdump(0); 394 395 pid = getpid(); 396 if ((pidfile = fopen(ROUTE6D_PID, "w")) != NULL) { 397 fprintf(pidfile, "%d\n", pid); 398 fclose(pidfile); 399 } 400 401 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) { 402 fatal("malloc"); 403 /*NOTREACHED*/ 404 } 405 memset(ripbuf, 0, RIP6_MAXMTU); 406 ripbuf->rip6_cmd = RIP6_RESPONSE; 407 ripbuf->rip6_vers = RIP6_VERSION; 408 ripbuf->rip6_res1[0] = 0; 409 ripbuf->rip6_res1[1] = 0; 410 411 if (signal(SIGALRM, sighandler) == SIG_ERR || 412 signal(SIGQUIT, sighandler) == SIG_ERR || 413 signal(SIGTERM, sighandler) == SIG_ERR || 414 signal(SIGUSR1, sighandler) == SIG_ERR || 415 signal(SIGHUP, sighandler) == SIG_ERR || 416 signal(SIGINT, sighandler) == SIG_ERR) { 417 fatal("signal"); 418 /*NOTREACHED*/ 419 } 420 /* 421 * To avoid rip packet congestion (not on a cable but in this 422 * process), wait for a moment to send the first RIP6_RESPONSE 423 * packets. 424 */ 425 alarm(ripinterval(INIT_INTERVAL6)); 426 427 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 428 if (iff_find(ifcp, 'N')) 429 continue; 430 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 431 sendrequest(ifcp); 432 } 433 434 syslog(LOG_INFO, "**** Started ****"); 435 sigemptyset(&mask); 436 sigaddset(&mask, SIGALRM); 437 while (1) { 438 fd_set recvec; 439 440 if (seenalrm) { 441 ripalarm(); 442 seenalrm = 0; 443 continue; 444 } 445 if (seenquit) { 446 rtdexit(); 447 seenquit = 0; 448 continue; 449 } 450 if (seenusr1) { 451 ifrtdump(SIGUSR1); 452 seenusr1 = 0; 453 continue; 454 } 455 456 FD_COPY(&sockvec, &recvec); 457 signo = 0; 458 switch (select(maxfd + 1, &recvec, 0, 0, 0)) { 459 case -1: 460 if (errno != EINTR) { 461 fatal("select"); 462 /*NOTREACHED*/ 463 } 464 continue; 465 case 0: 466 continue; 467 default: 468 if (FD_ISSET(ripsock, &recvec)) { 469 sigprocmask(SIG_BLOCK, &mask, &omask); 470 riprecv(); 471 sigprocmask(SIG_SETMASK, &omask, NULL); 472 } 473 if (FD_ISSET(rtsock, &recvec)) { 474 sigprocmask(SIG_BLOCK, &mask, &omask); 475 rtrecv(); 476 sigprocmask(SIG_SETMASK, &omask, NULL); 477 } 478 } 479 } 480 } 481 482 void 483 sighandler(sig) 484 int sig; 485 { 486 487 signo = sig; 488 switch (signo) { 489 case SIGALRM: 490 seenalrm++; 491 break; 492 case SIGQUIT: 493 case SIGTERM: 494 seenquit++; 495 break; 496 case SIGUSR1: 497 case SIGHUP: 498 case SIGINT: 499 seenusr1++; 500 break; 501 } 502 } 503 504 /* 505 * gracefully exits after resetting sockopts. 506 */ 507 /* ARGSUSED */ 508 void 509 rtdexit() 510 { 511 struct riprt *rrt; 512 513 alarm(0); 514 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 515 if (rrt->rrt_rflags & RRTF_AGGREGATE) { 516 delroute(&rrt->rrt_info, &rrt->rrt_gw); 517 } 518 } 519 close(ripsock); 520 close(rtsock); 521 syslog(LOG_INFO, "**** Terminated ****"); 522 closelog(); 523 exit(1); 524 } 525 526 /* 527 * Called periodically: 528 * 1. age out the learned route. remove it if necessary. 529 * 2. submit RIP6_RESPONSE packets. 530 * Invoked in every SUPPLY_INTERVAL6 (30) seconds. I believe we don't have 531 * to invoke this function in every 1 or 5 or 10 seconds only to age the 532 * routes more precisely. 533 */ 534 /* ARGSUSED */ 535 void 536 ripalarm() 537 { 538 struct ifc *ifcp; 539 struct riprt *rrt, *rrt_prev, *rrt_next; 540 time_t t_lifetime, t_holddown; 541 542 /* age the RIP routes */ 543 rrt_prev = 0; 544 t_lifetime = time(NULL) - RIP_LIFETIME; 545 t_holddown = t_lifetime - RIP_HOLDDOWN; 546 for (rrt = riprt; rrt; rrt = rrt_next) { 547 rrt_next = rrt->rrt_next; 548 549 if (rrt->rrt_t == 0) { 550 rrt_prev = rrt; 551 continue; 552 } 553 if (rrt->rrt_t < t_holddown) { 554 if (rrt_prev) { 555 rrt_prev->rrt_next = rrt->rrt_next; 556 } else { 557 riprt = rrt->rrt_next; 558 } 559 delroute(&rrt->rrt_info, &rrt->rrt_gw); 560 free(rrt); 561 continue; 562 } 563 if (rrt->rrt_t < t_lifetime) 564 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 565 rrt_prev = rrt; 566 } 567 /* Supply updates */ 568 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 569 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 570 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 571 } 572 alarm(ripinterval(SUPPLY_INTERVAL6)); 573 } 574 575 void 576 init() 577 { 578 int i, int0, int255, error; 579 struct addrinfo hints, *res; 580 char port[10]; 581 582 ifc = (struct ifc *)NULL; 583 nifc = 0; 584 nindex2ifc = 0; /*initial guess*/ 585 index2ifc = NULL; 586 snprintf(port, sizeof(port), "%d", RIP6_PORT); 587 588 memset(&hints, 0, sizeof(hints)); 589 hints.ai_family = PF_INET6; 590 hints.ai_socktype = SOCK_DGRAM; 591 hints.ai_flags = AI_PASSIVE; 592 error = getaddrinfo(NULL, port, &hints, &res); 593 if (error) { 594 fatal("%s", gai_strerror(error)); 595 /*NOTREACHED*/ 596 } 597 if (res->ai_next) { 598 fatal(":: resolved to multiple address"); 599 /*NOTREACHED*/ 600 } 601 602 int0 = 0; int255 = 255; 603 ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 604 if (ripsock < 0) { 605 fatal("rip socket"); 606 /*NOTREACHED*/ 607 } 608 if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) { 609 fatal("rip bind"); 610 /*NOTREACHED*/ 611 } 612 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 613 &int255, sizeof(int255)) < 0) { 614 fatal("rip IPV6_MULTICAST_HOPS"); 615 /*NOTREACHED*/ 616 } 617 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, 618 &int0, sizeof(int0)) < 0) { 619 fatal("rip IPV6_MULTICAST_LOOP"); 620 /*NOTREACHED*/ 621 } 622 623 i = 1; 624 #ifdef IPV6_RECVPKTINFO 625 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i, 626 sizeof(i)) < 0) { 627 fatal("rip IPV6_RECVPKTINFO"); 628 /*NOTREACHED*/ 629 } 630 #else /* old adv. API */ 631 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, &i, 632 sizeof(i)) < 0) { 633 fatal("rip IPV6_PKTINFO"); 634 /*NOTREACHED*/ 635 } 636 #endif 637 638 memset(&hints, 0, sizeof(hints)); 639 hints.ai_family = PF_INET6; 640 hints.ai_socktype = SOCK_DGRAM; 641 error = getaddrinfo(RIP6_DEST, port, &hints, &res); 642 if (error) { 643 fatal("%s", gai_strerror(error)); 644 /*NOTREACHED*/ 645 } 646 if (res->ai_next) { 647 fatal("%s resolved to multiple address", RIP6_DEST); 648 /*NOTREACHED*/ 649 } 650 memcpy(&ripsin, res->ai_addr, res->ai_addrlen); 651 652 #ifdef FD_ZERO 653 FD_ZERO(&sockvec); 654 #else 655 memset(&sockvec, 0, sizeof(sockvec)); 656 #endif 657 FD_SET(ripsock, &sockvec); 658 maxfd = ripsock; 659 660 if (nflag == 0) { 661 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) { 662 fatal("route socket"); 663 /*NOTREACHED*/ 664 } 665 FD_SET(rtsock, &sockvec); 666 if (rtsock > maxfd) 667 maxfd = rtsock; 668 } else 669 rtsock = -1; /*just for safety */ 670 } 671 672 #define RIPSIZE(n) \ 673 (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6)) 674 675 /* 676 * ripflush flushes the rip datagram stored in the rip buffer 677 */ 678 static int nrt; 679 static struct netinfo6 *np; 680 681 void 682 ripflush(ifcp, sin6) 683 struct ifc *ifcp; 684 struct sockaddr_in6 *sin6; 685 { 686 int i; 687 int error; 688 689 if (ifcp) 690 tracet(1, "Send(%s): info(%d) to %s.%d\n", 691 ifcp->ifc_name, nrt, 692 inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port)); 693 else 694 tracet(1, "Send: info(%d) to %s.%d\n", 695 nrt, inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port)); 696 if (dflag >= 2) { 697 np = ripbuf->rip6_nets; 698 for (i = 0; i < nrt; i++, np++) { 699 if (np->rip6_metric == NEXTHOP_METRIC) { 700 if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) 701 trace(2, " NextHop reset"); 702 else { 703 trace(2, " NextHop %s", 704 inet6_n2p(&np->rip6_dest)); 705 } 706 } else { 707 trace(2, " %s/%d[%d]", 708 inet6_n2p(&np->rip6_dest), 709 np->rip6_plen, np->rip6_metric); 710 } 711 if (np->rip6_tag) { 712 trace(2, " tag=0x%04x", 713 ntohs(np->rip6_tag) & 0xffff); 714 } 715 trace(2, "\n"); 716 } 717 } 718 error = sendpacket(sin6, RIPSIZE(nrt)); 719 if (error == EAFNOSUPPORT) { 720 /* Protocol not supported */ 721 tracet(1, "Could not send info to %s (%s): " 722 "set IFF_UP to 0\n", 723 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 724 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 725 } 726 nrt = 0; np = ripbuf->rip6_nets; 727 } 728 729 /* 730 * Generate RIP6_RESPONSE packets and send them. 731 */ 732 void 733 ripsend(ifcp, sin6, flag) 734 struct ifc *ifcp; 735 struct sockaddr_in6 *sin6; 736 int flag; 737 { 738 struct riprt *rrt; 739 struct in6_addr *nh; /* next hop */ 740 int maxrte; 741 742 if (ifcp == NULL) { 743 /* 744 * Request from non-link local address is not 745 * a regular route6d update. 746 */ 747 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) - 748 sizeof(struct udphdr) - 749 sizeof(struct rip6) + sizeof(struct netinfo6)) / 750 sizeof(struct netinfo6); 751 nrt = 0; np = ripbuf->rip6_nets; nh = NULL; 752 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 753 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 754 continue; 755 /* Put the route to the buffer */ 756 *np = rrt->rrt_info; 757 np++; nrt++; 758 if (nrt == maxrte) { 759 ripflush(NULL, sin6); 760 nh = NULL; 761 } 762 } 763 if (nrt) /* Send last packet */ 764 ripflush(NULL, sin6); 765 return; 766 } 767 768 if ((flag & RRTF_SENDANYWAY) == 0 && 769 (qflag || (ifcp->ifc_flags & IFF_LOOPBACK))) 770 return; 771 772 /* -N: no use */ 773 if (iff_find(ifcp, 'N') != NULL) 774 return; 775 776 /* -T: generate default route only */ 777 if (iff_find(ifcp, 'T') != NULL) { 778 struct netinfo6 rrt_info; 779 memset(&rrt_info, 0, sizeof(struct netinfo6)); 780 rrt_info.rip6_dest = in6addr_any; 781 rrt_info.rip6_plen = 0; 782 rrt_info.rip6_metric = 1; 783 rrt_info.rip6_metric += ifcp->ifc_metric; 784 rrt_info.rip6_tag = htons(routetag & 0xffff); 785 np = ripbuf->rip6_nets; 786 *np = rrt_info; 787 nrt = 1; 788 ripflush(ifcp, sin6); 789 return; 790 } 791 792 maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) - 793 sizeof(struct udphdr) - 794 sizeof(struct rip6) + sizeof(struct netinfo6)) / 795 sizeof(struct netinfo6); 796 797 nrt = 0; np = ripbuf->rip6_nets; nh = NULL; 798 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 799 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 800 continue; 801 802 /* Need to check filter here */ 803 if (out_filter(rrt, ifcp) == 0) 804 continue; 805 806 /* Check split horizon and other conditions */ 807 if (tobeadv(rrt, ifcp) == 0) 808 continue; 809 810 /* Only considers the routes with flag if specified */ 811 if ((flag & RRTF_CHANGED) && 812 (rrt->rrt_rflags & RRTF_CHANGED) == 0) 813 continue; 814 815 /* Check nexthop */ 816 if (rrt->rrt_index == ifcp->ifc_index && 817 !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) && 818 (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) { 819 if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) { 820 if (nrt == maxrte - 2) 821 ripflush(ifcp, sin6); 822 np->rip6_dest = rrt->rrt_gw; 823 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) 824 SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0); 825 np->rip6_plen = 0; 826 np->rip6_tag = 0; 827 np->rip6_metric = NEXTHOP_METRIC; 828 nh = &rrt->rrt_gw; 829 np++; nrt++; 830 } 831 } else if (nh && (rrt->rrt_index != ifcp->ifc_index || 832 !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) || 833 rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) { 834 /* Reset nexthop */ 835 if (nrt == maxrte - 2) 836 ripflush(ifcp, sin6); 837 memset(np, 0, sizeof(struct netinfo6)); 838 np->rip6_metric = NEXTHOP_METRIC; 839 nh = NULL; 840 np++; nrt++; 841 } 842 843 /* Put the route to the buffer */ 844 *np = rrt->rrt_info; 845 np++; nrt++; 846 if (nrt == maxrte) { 847 ripflush(ifcp, sin6); 848 nh = NULL; 849 } 850 } 851 if (nrt) /* Send last packet */ 852 ripflush(ifcp, sin6); 853 } 854 855 /* 856 * outbound filter logic, per-route/interface. 857 */ 858 int 859 out_filter(rrt, ifcp) 860 struct riprt *rrt; 861 struct ifc *ifcp; 862 { 863 struct iff *iffp; 864 struct in6_addr ia; 865 int ok; 866 867 /* 868 * -A: filter out less specific routes, if we have aggregated 869 * route configured. 870 */ 871 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 872 if (iffp->iff_type != 'A') 873 continue; 874 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen) 875 continue; 876 ia = rrt->rrt_info.rip6_dest; 877 applyplen(&ia, iffp->iff_plen); 878 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) 879 return 0; 880 } 881 882 /* 883 * if it is an aggregated route, advertise it only to the 884 * interfaces specified on -A. 885 */ 886 if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) { 887 ok = 0; 888 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 889 if (iffp->iff_type != 'A') 890 continue; 891 if (rrt->rrt_info.rip6_plen == iffp->iff_plen && 892 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 893 &iffp->iff_addr)) { 894 ok = 1; 895 break; 896 } 897 } 898 if (!ok) 899 return 0; 900 } 901 902 /* 903 * -O: advertise only if prefix matches the configured prefix. 904 */ 905 if (iff_find(ifcp, 'O')) { 906 ok = 0; 907 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 908 if (iffp->iff_type != 'O') 909 continue; 910 if (rrt->rrt_info.rip6_plen < iffp->iff_plen) 911 continue; 912 ia = rrt->rrt_info.rip6_dest; 913 applyplen(&ia, iffp->iff_plen); 914 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 915 ok = 1; 916 break; 917 } 918 } 919 if (!ok) 920 return 0; 921 } 922 923 /* the prefix should be advertised */ 924 return 1; 925 } 926 927 /* 928 * Determine if the route is to be advertised on the specified interface. 929 * It checks options specified in the arguments and the split horizon rule. 930 */ 931 int 932 tobeadv(rrt, ifcp) 933 struct riprt *rrt; 934 struct ifc *ifcp; 935 { 936 937 /* Special care for static routes */ 938 if (rrt->rrt_flags & RTF_STATIC) { 939 /* XXX don't advertise reject/blackhole routes */ 940 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE)) 941 return 0; 942 943 if (Sflag) /* Yes, advertise it anyway */ 944 return 1; 945 if (sflag && rrt->rrt_index != ifcp->ifc_index) 946 return 1; 947 return 0; 948 } 949 /* Regular split horizon */ 950 if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index) 951 return 0; 952 return 1; 953 } 954 955 /* 956 * Send a rip packet actually. 957 */ 958 int 959 sendpacket(sin6, len) 960 struct sockaddr_in6 *sin6; 961 int len; 962 { 963 struct msghdr m; 964 struct cmsghdr *cm; 965 struct iovec iov[2]; 966 u_char cmsgbuf[256]; 967 struct in6_pktinfo *pi; 968 int idx; 969 struct sockaddr_in6 sincopy; 970 971 /* do not overwrite the given sin */ 972 sincopy = *sin6; 973 sin6 = &sincopy; 974 975 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) || 976 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 977 /* XXX: do not mix the interface index and link index */ 978 idx = IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr); 979 SET_IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr, 0); 980 sin6->sin6_scope_id = idx; 981 } else 982 idx = 0; 983 984 m.msg_name = (caddr_t)sin6; 985 m.msg_namelen = sizeof(*sin6); 986 iov[0].iov_base = (caddr_t)ripbuf; 987 iov[0].iov_len = len; 988 m.msg_iov = iov; 989 m.msg_iovlen = 1; 990 if (!idx) { 991 m.msg_control = NULL; 992 m.msg_controllen = 0; 993 } else { 994 memset(cmsgbuf, 0, sizeof(cmsgbuf)); 995 cm = (struct cmsghdr *)cmsgbuf; 996 m.msg_control = (caddr_t)cm; 997 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); 998 999 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 1000 cm->cmsg_level = IPPROTO_IPV6; 1001 cm->cmsg_type = IPV6_PKTINFO; 1002 pi = (struct in6_pktinfo *)CMSG_DATA(cm); 1003 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/ 1004 pi->ipi6_ifindex = idx; 1005 } 1006 1007 if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) { 1008 trace(1, "sendmsg: %s\n", strerror(errno)); 1009 return errno; 1010 } 1011 1012 return 0; 1013 } 1014 1015 /* 1016 * Receive and process RIP packets. Update the routes/kernel forwarding 1017 * table if necessary. 1018 */ 1019 void 1020 riprecv() 1021 { 1022 struct ifc *ifcp, *ic; 1023 struct sockaddr_in6 fsock; 1024 struct in6_addr nh; /* next hop */ 1025 struct rip6 *rp; 1026 struct netinfo6 *np, *nq; 1027 struct riprt *rrt; 1028 int len, nn, need_trigger, idx; 1029 char buf[4 * RIP6_MAXMTU]; 1030 time_t t; 1031 struct msghdr m; 1032 struct cmsghdr *cm; 1033 struct iovec iov[2]; 1034 u_char cmsgbuf[256]; 1035 struct in6_pktinfo *pi; 1036 struct iff *iffp; 1037 struct in6_addr ia; 1038 int ok; 1039 time_t t_half_lifetime; 1040 1041 need_trigger = 0; 1042 1043 m.msg_name = (caddr_t)&fsock; 1044 m.msg_namelen = sizeof(fsock); 1045 iov[0].iov_base = (caddr_t)buf; 1046 iov[0].iov_len = sizeof(buf); 1047 m.msg_iov = iov; 1048 m.msg_iovlen = 1; 1049 cm = (struct cmsghdr *)cmsgbuf; 1050 m.msg_control = (caddr_t)cm; 1051 m.msg_controllen = sizeof(cmsgbuf); 1052 if ((len = recvmsg(ripsock, &m, 0)) < 0) { 1053 fatal("recvmsg"); 1054 /*NOTREACHED*/ 1055 } 1056 idx = 0; 1057 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m); 1058 cm; 1059 cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) { 1060 if (cm->cmsg_level == IPPROTO_IPV6 && 1061 cm->cmsg_type == IPV6_PKTINFO) { 1062 pi = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1063 idx = pi->ipi6_ifindex; 1064 break; 1065 } 1066 } 1067 if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) 1068 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx); 1069 1070 nh = fsock.sin6_addr; 1071 nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) / 1072 sizeof(struct netinfo6); 1073 rp = (struct rip6 *)buf; 1074 np = rp->rip6_nets; 1075 1076 if (rp->rip6_vers != RIP6_VERSION) { 1077 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers); 1078 return; 1079 } 1080 if (rp->rip6_cmd == RIP6_REQUEST) { 1081 if (idx && idx < nindex2ifc) { 1082 ifcp = index2ifc[idx]; 1083 riprequest(ifcp, np, nn, &fsock); 1084 } else { 1085 riprequest(NULL, np, nn, &fsock); 1086 } 1087 return; 1088 } 1089 1090 if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) { 1091 trace(1, "Packets from non-ll addr: %s\n", 1092 inet6_n2p(&fsock.sin6_addr)); 1093 return; /* Ignore packets from non-link-local addr */ 1094 } 1095 idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr); 1096 ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL; 1097 if (!ifcp) { 1098 trace(1, "Packets to unknown interface index %d\n", idx); 1099 return; /* Ignore it */ 1100 } 1101 if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr)) 1102 return; /* The packet is from me; ignore */ 1103 if (rp->rip6_cmd != RIP6_RESPONSE) { 1104 trace(1, "Invalid command %d\n", rp->rip6_cmd); 1105 return; 1106 } 1107 1108 /* -N: no use */ 1109 if (iff_find(ifcp, 'N') != NULL) 1110 return; 1111 1112 tracet(1, "Recv(%s): from %s.%d info(%d)\n", 1113 ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn); 1114 1115 t = time(NULL); 1116 t_half_lifetime = t - (RIP_LIFETIME/2); 1117 for (; nn; nn--, np++) { 1118 if (np->rip6_metric == NEXTHOP_METRIC) { 1119 /* modify neighbor address */ 1120 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1121 nh = np->rip6_dest; 1122 SET_IN6_LINKLOCAL_IFINDEX(nh, idx); 1123 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1124 } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) { 1125 nh = fsock.sin6_addr; 1126 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1127 } else { 1128 nh = fsock.sin6_addr; 1129 trace(1, "\tInvalid Nexthop: %s\n", 1130 inet6_n2p(&np->rip6_dest)); 1131 } 1132 continue; 1133 } 1134 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) { 1135 trace(1, "\tMulticast netinfo6: %s/%d [%d]\n", 1136 inet6_n2p(&np->rip6_dest), 1137 np->rip6_plen, np->rip6_metric); 1138 continue; 1139 } 1140 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) { 1141 trace(1, "\tLoopback netinfo6: %s/%d [%d]\n", 1142 inet6_n2p(&np->rip6_dest), 1143 np->rip6_plen, np->rip6_metric); 1144 continue; 1145 } 1146 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1147 trace(1, "\tLink Local netinfo6: %s/%d [%d]\n", 1148 inet6_n2p(&np->rip6_dest), 1149 np->rip6_plen, np->rip6_metric); 1150 continue; 1151 } 1152 /* may need to pass sitelocal prefix in some case, however*/ 1153 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) { 1154 trace(1, "\tSite Local netinfo6: %s/%d [%d]\n", 1155 inet6_n2p(&np->rip6_dest), 1156 np->rip6_plen, np->rip6_metric); 1157 continue; 1158 } 1159 trace(2, "\tnetinfo6: %s/%d [%d]", 1160 inet6_n2p(&np->rip6_dest), 1161 np->rip6_plen, np->rip6_metric); 1162 if (np->rip6_tag) 1163 trace(2, " tag=0x%04x", ntohs(np->rip6_tag) & 0xffff); 1164 if (dflag >= 2) { 1165 ia = np->rip6_dest; 1166 applyplen(&ia, np->rip6_plen); 1167 if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest)) 1168 trace(2, " [junk outside prefix]"); 1169 } 1170 1171 /* 1172 * -L: listen only if the prefix matches the configuration 1173 */ 1174 ok = 1; /* if there's no L filter, it is ok */ 1175 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 1176 if (iffp->iff_type != 'L') 1177 continue; 1178 ok = 0; 1179 if (np->rip6_plen < iffp->iff_plen) 1180 continue; 1181 /* special rule: ::/0 means default, not "in /0" */ 1182 if (iffp->iff_plen == 0 && np->rip6_plen > 0) 1183 continue; 1184 ia = np->rip6_dest; 1185 applyplen(&ia, iffp->iff_plen); 1186 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 1187 ok = 1; 1188 break; 1189 } 1190 } 1191 if (!ok) { 1192 trace(2, " (filtered)\n"); 1193 continue; 1194 } 1195 1196 trace(2, "\n"); 1197 np->rip6_metric++; 1198 np->rip6_metric += ifcp->ifc_metric; 1199 if (np->rip6_metric > HOPCNT_INFINITY6) 1200 np->rip6_metric = HOPCNT_INFINITY6; 1201 1202 applyplen(&np->rip6_dest, np->rip6_plen); 1203 if ((rrt = rtsearch(np, NULL)) != NULL) { 1204 if (rrt->rrt_t == 0) 1205 continue; /* Intf route has priority */ 1206 nq = &rrt->rrt_info; 1207 if (nq->rip6_metric > np->rip6_metric) { 1208 if (rrt->rrt_index == ifcp->ifc_index && 1209 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1210 /* Small metric from the same gateway */ 1211 nq->rip6_metric = np->rip6_metric; 1212 } else { 1213 /* Better route found */ 1214 rrt->rrt_index = ifcp->ifc_index; 1215 /* Update routing table */ 1216 delroute(nq, &rrt->rrt_gw); 1217 rrt->rrt_gw = nh; 1218 *nq = *np; 1219 addroute(rrt, &nh, ifcp); 1220 } 1221 rrt->rrt_rflags |= RRTF_CHANGED; 1222 rrt->rrt_t = t; 1223 need_trigger = 1; 1224 } else if (nq->rip6_metric < np->rip6_metric && 1225 rrt->rrt_index == ifcp->ifc_index && 1226 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1227 /* Got worse route from same gw */ 1228 nq->rip6_metric = np->rip6_metric; 1229 rrt->rrt_t = t; 1230 rrt->rrt_rflags |= RRTF_CHANGED; 1231 need_trigger = 1; 1232 } else if (nq->rip6_metric == np->rip6_metric && 1233 np->rip6_metric < HOPCNT_INFINITY6) { 1234 if (rrt->rrt_index == ifcp->ifc_index && 1235 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1236 /* same metric, same route from same gw */ 1237 rrt->rrt_t = t; 1238 } else if (rrt->rrt_t < t_half_lifetime) { 1239 /* Better route found */ 1240 rrt->rrt_index = ifcp->ifc_index; 1241 /* Update routing table */ 1242 delroute(nq, &rrt->rrt_gw); 1243 rrt->rrt_gw = nh; 1244 *nq = *np; 1245 addroute(rrt, &nh, ifcp); 1246 rrt->rrt_rflags |= RRTF_CHANGED; 1247 rrt->rrt_t = t; 1248 } 1249 } 1250 /* 1251 * if nq->rip6_metric == HOPCNT_INFINITY6 then 1252 * do not update age value. Do nothing. 1253 */ 1254 } else if (np->rip6_metric < HOPCNT_INFINITY6) { 1255 /* Got a new valid route */ 1256 if ((rrt = MALLOC(struct riprt)) == NULL) { 1257 fatal("malloc: struct riprt"); 1258 /*NOTREACHED*/ 1259 } 1260 memset(rrt, 0, sizeof(*rrt)); 1261 nq = &rrt->rrt_info; 1262 1263 rrt->rrt_same = NULL; 1264 rrt->rrt_index = ifcp->ifc_index; 1265 rrt->rrt_flags = RTF_UP|RTF_GATEWAY; 1266 rrt->rrt_gw = nh; 1267 *nq = *np; 1268 applyplen(&nq->rip6_dest, nq->rip6_plen); 1269 if (nq->rip6_plen == sizeof(struct in6_addr) * 8) 1270 rrt->rrt_flags |= RTF_HOST; 1271 1272 /* Put the route to the list */ 1273 rrt->rrt_next = riprt; 1274 riprt = rrt; 1275 /* Update routing table */ 1276 addroute(rrt, &nh, ifcp); 1277 rrt->rrt_rflags |= RRTF_CHANGED; 1278 need_trigger = 1; 1279 rrt->rrt_t = t; 1280 } 1281 } 1282 /* XXX need to care the interval between triggered updates */ 1283 if (need_trigger) { 1284 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) { 1285 for (ic = ifc; ic; ic = ic->ifc_next) { 1286 if (ifcp->ifc_index == ic->ifc_index) 1287 continue; 1288 if (ic->ifc_flags & IFF_UP) 1289 ripsend(ic, &ic->ifc_ripsin, 1290 RRTF_CHANGED); 1291 } 1292 } 1293 /* Reset the flag */ 1294 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1295 rrt->rrt_rflags &= ~RRTF_CHANGED; 1296 } 1297 } 1298 1299 /* 1300 * Send all routes request packet to the specified interface. 1301 */ 1302 void 1303 sendrequest(ifcp) 1304 struct ifc *ifcp; 1305 { 1306 struct netinfo6 *np; 1307 int error; 1308 1309 if (ifcp->ifc_flags & IFF_LOOPBACK) 1310 return; 1311 ripbuf->rip6_cmd = RIP6_REQUEST; 1312 np = ripbuf->rip6_nets; 1313 memset(np, 0, sizeof(struct netinfo6)); 1314 np->rip6_metric = HOPCNT_INFINITY6; 1315 tracet(1, "Send rtdump Request to %s (%s)\n", 1316 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1317 error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1)); 1318 if (error == EAFNOSUPPORT) { 1319 /* Protocol not supported */ 1320 tracet(1, "Could not send rtdump Request to %s (%s): " 1321 "set IFF_UP to 0\n", 1322 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1323 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 1324 } 1325 ripbuf->rip6_cmd = RIP6_RESPONSE; 1326 } 1327 1328 /* 1329 * Process a RIP6_REQUEST packet. 1330 */ 1331 void 1332 riprequest(ifcp, np, nn, sin6) 1333 struct ifc *ifcp; 1334 struct netinfo6 *np; 1335 int nn; 1336 struct sockaddr_in6 *sin6; 1337 { 1338 int i; 1339 struct riprt *rrt; 1340 1341 if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) && 1342 np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) { 1343 /* Specific response, don't split-horizon */ 1344 trace(1, "\tRIP Request\n"); 1345 for (i = 0; i < nn; i++, np++) { 1346 rrt = rtsearch(np, NULL); 1347 if (rrt) 1348 np->rip6_metric = rrt->rrt_info.rip6_metric; 1349 else 1350 np->rip6_metric = HOPCNT_INFINITY6; 1351 } 1352 (void)sendpacket(sin6, RIPSIZE(nn)); 1353 return; 1354 } 1355 /* Whole routing table dump */ 1356 trace(1, "\tRIP Request -- whole routing table\n"); 1357 ripsend(ifcp, sin6, RRTF_SENDANYWAY); 1358 } 1359 1360 /* 1361 * Get information of each interface. 1362 */ 1363 void 1364 ifconfig() 1365 { 1366 struct ifaddrs *ifap, *ifa; 1367 struct ifc *ifcp; 1368 struct ipv6_mreq mreq; 1369 int s; 1370 1371 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 1372 fatal("socket"); 1373 /*NOTREACHED*/ 1374 } 1375 1376 if (getifaddrs(&ifap) != 0) { 1377 fatal("getifaddrs"); 1378 /*NOTREACHED*/ 1379 } 1380 1381 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 1382 if (ifa->ifa_addr->sa_family != AF_INET6) 1383 continue; 1384 ifcp = ifc_find(ifa->ifa_name); 1385 /* we are interested in multicast-capable interfaces */ 1386 if ((ifa->ifa_flags & IFF_MULTICAST) == 0) 1387 continue; 1388 if (!ifcp) { 1389 /* new interface */ 1390 if ((ifcp = MALLOC(struct ifc)) == NULL) { 1391 fatal("malloc: struct ifc"); 1392 /*NOTREACHED*/ 1393 } 1394 memset(ifcp, 0, sizeof(*ifcp)); 1395 ifcp->ifc_index = -1; 1396 ifcp->ifc_next = ifc; 1397 ifc = ifcp; 1398 nifc++; 1399 ifcp->ifc_name = allocopy(ifa->ifa_name); 1400 ifcp->ifc_addr = 0; 1401 ifcp->ifc_filter = 0; 1402 ifcp->ifc_flags = ifa->ifa_flags; 1403 trace(1, "newif %s <%s>\n", ifcp->ifc_name, 1404 ifflags(ifcp->ifc_flags)); 1405 if (!strcmp(ifcp->ifc_name, LOOPBACK_IF)) 1406 loopifcp = ifcp; 1407 } else { 1408 /* update flag, this may be up again */ 1409 if (ifcp->ifc_flags != ifa->ifa_flags) { 1410 trace(1, "%s: <%s> -> ", ifcp->ifc_name, 1411 ifflags(ifcp->ifc_flags)); 1412 trace(1, "<%s>\n", ifflags(ifa->ifa_flags)); 1413 ifcp->ifc_cflags |= IFC_CHANGED; 1414 } 1415 ifcp->ifc_flags = ifa->ifa_flags; 1416 } 1417 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s); 1418 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP 1419 && 0 < ifcp->ifc_index && !ifcp->ifc_joined) { 1420 mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr; 1421 mreq.ipv6mr_interface = ifcp->ifc_index; 1422 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP, 1423 &mreq, sizeof(mreq)) < 0) { 1424 fatal("IPV6_JOIN_GROUP"); 1425 /*NOTREACHED*/ 1426 } 1427 trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST); 1428 ifcp->ifc_joined++; 1429 } 1430 } 1431 close(s); 1432 freeifaddrs(ifap); 1433 } 1434 1435 void 1436 ifconfig1(name, sa, ifcp, s) 1437 const char *name; 1438 const struct sockaddr *sa; 1439 struct ifc *ifcp; 1440 int s; 1441 { 1442 struct in6_ifreq ifr; 1443 const struct sockaddr_in6 *sin6; 1444 struct ifac *ifa; 1445 int plen; 1446 char buf[BUFSIZ]; 1447 1448 sin6 = (const struct sockaddr_in6 *)sa; 1449 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) && !lflag) 1450 return; 1451 ifr.ifr_addr = *sin6; 1452 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 1453 if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) { 1454 fatal("ioctl: SIOCGIFNETMASK_IN6"); 1455 /*NOTREACHED*/ 1456 } 1457 plen = sin6mask2len(&ifr.ifr_addr); 1458 if ((ifa = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) { 1459 /* same interface found */ 1460 /* need check if something changed */ 1461 /* XXX not yet implemented */ 1462 return; 1463 } 1464 /* 1465 * New address is found 1466 */ 1467 if ((ifa = MALLOC(struct ifac)) == NULL) { 1468 fatal("malloc: struct ifac"); 1469 /*NOTREACHED*/ 1470 } 1471 memset(ifa, 0, sizeof(*ifa)); 1472 ifa->ifa_conf = ifcp; 1473 ifa->ifa_next = ifcp->ifc_addr; 1474 ifcp->ifc_addr = ifa; 1475 ifa->ifa_addr = sin6->sin6_addr; 1476 ifa->ifa_plen = plen; 1477 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1478 ifr.ifr_addr = *sin6; 1479 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) { 1480 fatal("ioctl: SIOCGIFDSTADDR_IN6"); 1481 /*NOTREACHED*/ 1482 } 1483 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr; 1484 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf)); 1485 trace(1, "found address %s/%d -- %s\n", 1486 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf); 1487 } else { 1488 trace(1, "found address %s/%d\n", 1489 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen); 1490 } 1491 if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 1492 ifcp->ifc_mylladdr = ifa->ifa_addr; 1493 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr); 1494 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len); 1495 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr, 1496 ifcp->ifc_index); 1497 setindex2ifc(ifcp->ifc_index, ifcp); 1498 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index); 1499 if (ifcp->ifc_mtu > RIP6_MAXMTU) 1500 ifcp->ifc_mtu = RIP6_MAXMTU; 1501 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) { 1502 fatal("ioctl: SIOCGIFMETRIC"); 1503 /*NOTREACHED*/ 1504 } 1505 ifcp->ifc_metric = ifr.ifr_metric; 1506 trace(1, "\tindex: %d, mtu: %d, metric: %d\n", 1507 ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric); 1508 } else 1509 ifcp->ifc_cflags |= IFC_CHANGED; 1510 } 1511 1512 /* 1513 * Receive and process routing messages. 1514 * Update interface information as necesssary. 1515 */ 1516 void 1517 rtrecv() 1518 { 1519 char buf[BUFSIZ]; 1520 char *p, *q; 1521 struct rt_msghdr *rtm; 1522 struct ifa_msghdr *ifam; 1523 struct if_msghdr *ifm; 1524 int len; 1525 struct ifc *ifcp, *ic; 1526 int iface = 0, rtable = 0; 1527 struct sockaddr_in6 *rta[RTAX_MAX]; 1528 struct sockaddr_in6 mask; 1529 int i, addrs; 1530 struct riprt *rrt; 1531 1532 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 1533 perror("read from rtsock"); 1534 exit(1); 1535 } 1536 if (len < sizeof(*rtm)) { 1537 trace(1, "short read from rtsock: %d (should be > %lu)\n", 1538 len, (u_long)sizeof(*rtm)); 1539 return; 1540 } 1541 if (dflag >= 2) { 1542 fprintf(stderr, "rtmsg:\n"); 1543 for (i = 0; i < len; i++) { 1544 fprintf(stderr, "%02x ", buf[i] & 0xff); 1545 if (i % 16 == 15) fprintf(stderr, "\n"); 1546 } 1547 fprintf(stderr, "\n"); 1548 } 1549 1550 for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) { 1551 /* safety against bogus message */ 1552 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) { 1553 trace(1, "bogus rtmsg: length=%d\n", 1554 ((struct rt_msghdr *)p)->rtm_msglen); 1555 break; 1556 } 1557 rtm = NULL; 1558 ifam = NULL; 1559 ifm = NULL; 1560 switch (((struct rt_msghdr *)p)->rtm_type) { 1561 case RTM_NEWADDR: 1562 case RTM_DELADDR: 1563 ifam = (struct ifa_msghdr *)p; 1564 addrs = ifam->ifam_addrs; 1565 q = (char *)(ifam + 1); 1566 break; 1567 case RTM_IFINFO: 1568 ifm = (struct if_msghdr *)p; 1569 addrs = ifm->ifm_addrs; 1570 q = (char *)(ifm + 1); 1571 break; 1572 default: 1573 rtm = (struct rt_msghdr *)p; 1574 addrs = rtm->rtm_addrs; 1575 q = (char *)(rtm + 1); 1576 if (rtm->rtm_version != RTM_VERSION) { 1577 trace(1, "unexpected rtmsg version %d " 1578 "(should be %d)\n", 1579 rtm->rtm_version, RTM_VERSION); 1580 continue; 1581 } 1582 if (rtm->rtm_pid == pid) { 1583 #if 0 1584 trace(1, "rtmsg looped back to me, ignored\n"); 1585 #endif 1586 continue; 1587 } 1588 break; 1589 } 1590 memset(&rta, 0, sizeof(rta)); 1591 for (i = 0; i < RTAX_MAX; i++) { 1592 if (addrs & (1 << i)) { 1593 rta[i] = (struct sockaddr_in6 *)q; 1594 q += ROUNDUP(rta[i]->sin6_len); 1595 } 1596 } 1597 1598 trace(1, "rtsock: %s (addrs=%x)\n", 1599 rttypes((struct rt_msghdr *)p), addrs); 1600 if (dflag >= 2) { 1601 for (i = 0; 1602 i < ((struct rt_msghdr *)p)->rtm_msglen; 1603 i++) { 1604 fprintf(stderr, "%02x ", p[i] & 0xff); 1605 if (i % 16 == 15) fprintf(stderr, "\n"); 1606 } 1607 fprintf(stderr, "\n"); 1608 } 1609 1610 /* 1611 * Easy ones first. 1612 * 1613 * We may be able to optimize by using ifm->ifm_index or 1614 * ifam->ifam_index. For simplicity we don't do that here. 1615 */ 1616 switch (((struct rt_msghdr *)p)->rtm_type) { 1617 case RTM_NEWADDR: 1618 case RTM_IFINFO: 1619 iface++; 1620 continue; 1621 case RTM_ADD: 1622 rtable++; 1623 continue; 1624 case RTM_LOSING: 1625 case RTM_MISS: 1626 case RTM_RESOLVE: 1627 case RTM_GET: 1628 case RTM_LOCK: 1629 /* nothing to be done here */ 1630 trace(1, "\tnothing to be done, ignored\n"); 1631 continue; 1632 } 1633 1634 #if 0 1635 if (rta[RTAX_DST] == NULL) { 1636 trace(1, "\tno destination, ignored\n"); 1637 continue; 1638 } 1639 if (rta[RTAX_DST]->sin6_family != AF_INET6) { 1640 trace(1, "\taf mismatch, ignored\n"); 1641 continue; 1642 } 1643 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) { 1644 trace(1, "\tlinklocal destination, ignored\n"); 1645 continue; 1646 } 1647 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) { 1648 trace(1, "\tloopback destination, ignored\n"); 1649 continue; /* Loopback */ 1650 } 1651 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) { 1652 trace(1, "\tmulticast destination, ignored\n"); 1653 continue; 1654 } 1655 #endif 1656 1657 /* hard ones */ 1658 switch (((struct rt_msghdr *)p)->rtm_type) { 1659 case RTM_NEWADDR: 1660 case RTM_IFINFO: 1661 case RTM_ADD: 1662 case RTM_LOSING: 1663 case RTM_MISS: 1664 case RTM_RESOLVE: 1665 case RTM_GET: 1666 case RTM_LOCK: 1667 /* should already be handled */ 1668 fatal("rtrecv: never reach here"); 1669 /*NOTREACHED*/ 1670 case RTM_DELETE: 1671 if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) { 1672 trace(1, "\tsome of dst/gw/netamsk are " 1673 "unavailable, ignored\n"); 1674 break; 1675 } 1676 if ((rtm->rtm_flags & RTF_HOST) != 0) { 1677 mask.sin6_len = sizeof(mask); 1678 memset(&mask.sin6_addr, 0xff, 1679 sizeof(mask.sin6_addr)); 1680 rta[RTAX_NETMASK] = &mask; 1681 } else if (!rta[RTAX_NETMASK]) { 1682 trace(1, "\tsome of dst/gw/netamsk are " 1683 "unavailable, ignored\n"); 1684 break; 1685 } 1686 if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY], 1687 rta[RTAX_NETMASK]) == 0) { 1688 rtable++; /*just to be sure*/ 1689 } 1690 break; 1691 case RTM_CHANGE: 1692 case RTM_REDIRECT: 1693 trace(1, "\tnot supported yet, ignored\n"); 1694 break; 1695 case RTM_DELADDR: 1696 if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) { 1697 trace(1, "\tno netmask or ifa given, ignored\n"); 1698 break; 1699 } 1700 if (ifam->ifam_index < nindex2ifc) 1701 ifcp = index2ifc[ifam->ifam_index]; 1702 else 1703 ifcp = NULL; 1704 if (!ifcp) { 1705 trace(1, "\tinvalid ifam_index %d, ignored\n", 1706 ifam->ifam_index); 1707 break; 1708 } 1709 if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK])) 1710 iface++; 1711 break; 1712 case RTM_OLDADD: 1713 case RTM_OLDDEL: 1714 trace(1, "\tnot supported yet, ignored\n"); 1715 break; 1716 } 1717 1718 } 1719 1720 if (iface) { 1721 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n"); 1722 ifconfig(); 1723 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 1724 if (ifcp->ifc_cflags & IFC_CHANGED) { 1725 if (ifrt(ifcp, 1)) { 1726 for (ic = ifc; ic; ic = ic->ifc_next) { 1727 if (ifcp->ifc_index == ic->ifc_index) 1728 continue; 1729 if (ic->ifc_flags & IFF_UP) 1730 ripsend(ic, &ic->ifc_ripsin, 1731 RRTF_CHANGED); 1732 } 1733 /* Reset the flag */ 1734 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1735 rrt->rrt_rflags &= ~RRTF_CHANGED; 1736 } 1737 ifcp->ifc_cflags &= ~IFC_CHANGED; 1738 } 1739 } 1740 if (rtable) { 1741 trace(1, "rtsock: read routing table again\n"); 1742 krtread(1); 1743 } 1744 } 1745 1746 /* 1747 * remove specified route from the internal routing table. 1748 */ 1749 int 1750 rt_del(sdst, sgw, smask) 1751 const struct sockaddr_in6 *sdst; 1752 const struct sockaddr_in6 *sgw; 1753 const struct sockaddr_in6 *smask; 1754 { 1755 const struct in6_addr *dst = NULL; 1756 const struct in6_addr *gw = NULL; 1757 int prefix; 1758 struct netinfo6 ni6; 1759 struct riprt *rrt = NULL; 1760 time_t t_lifetime; 1761 1762 if (sdst->sin6_family != AF_INET6) { 1763 trace(1, "\tother AF, ignored\n"); 1764 return -1; 1765 } 1766 if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr) 1767 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback) 1768 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) { 1769 trace(1, "\taddress %s not interesting, ignored\n", 1770 inet6_n2p(&sdst->sin6_addr)); 1771 return -1; 1772 } 1773 dst = &sdst->sin6_addr; 1774 if (sgw->sin6_family == AF_INET6) { 1775 /* easy case */ 1776 gw = &sgw->sin6_addr; 1777 prefix = sin6mask2len(smask); 1778 } else if (sgw->sin6_family == AF_LINK) { 1779 /* 1780 * Interface route... a hard case. We need to get the prefix 1781 * length from the kernel, but we now are parsing rtmsg. 1782 * We'll purge matching routes from my list, then get the 1783 * fresh list. 1784 */ 1785 struct riprt *longest; 1786 trace(1, "\t%s is a interface route, guessing prefixlen\n", 1787 inet6_n2p(dst)); 1788 longest = NULL; 1789 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 1790 if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 1791 &sdst->sin6_addr) 1792 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) { 1793 if (!longest 1794 || longest->rrt_info.rip6_plen < 1795 rrt->rrt_info.rip6_plen) { 1796 longest = rrt; 1797 } 1798 } 1799 } 1800 rrt = longest; 1801 if (!rrt) { 1802 trace(1, "\tno matching interface route found\n"); 1803 return -1; 1804 } 1805 gw = &in6addr_loopback; 1806 prefix = rrt->rrt_info.rip6_plen; 1807 } else { 1808 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family); 1809 return -1; 1810 } 1811 1812 trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix); 1813 trace(1, "gw %s\n", inet6_n2p(gw)); 1814 t_lifetime = time(NULL) - RIP_LIFETIME; 1815 /* age route for interface address */ 1816 memset(&ni6, 0, sizeof(ni6)); 1817 ni6.rip6_dest = *dst; 1818 ni6.rip6_plen = prefix; 1819 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 1820 trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest), 1821 ni6.rip6_plen); 1822 if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) { 1823 trace(1, "\tno route found\n"); 1824 return -1; 1825 } 1826 #if 0 1827 if ((rrt->rrt_flags & RTF_STATIC) == 0) { 1828 trace(1, "\tyou can delete static routes only\n"); 1829 } else 1830 #endif 1831 if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) { 1832 trace(1, "\tgw mismatch: %s <-> ", 1833 inet6_n2p(&rrt->rrt_gw)); 1834 trace(1, "%s\n", inet6_n2p(gw)); 1835 } else { 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 } 1842 return 0; 1843 } 1844 1845 /* 1846 * remove specified address from internal interface/routing table. 1847 */ 1848 int 1849 rt_deladdr(ifcp, sifa, smask) 1850 struct ifc *ifcp; 1851 const struct sockaddr_in6 *sifa; 1852 const struct sockaddr_in6 *smask; 1853 { 1854 const struct in6_addr *addr = NULL; 1855 int prefix; 1856 struct ifac *ifa = NULL; 1857 struct netinfo6 ni6; 1858 struct riprt *rrt = NULL; 1859 time_t t_lifetime; 1860 int updated = 0; 1861 1862 if (sifa->sin6_family != AF_INET6) { 1863 trace(1, "\tother AF, ignored\n"); 1864 return -1; 1865 } 1866 addr = &sifa->sin6_addr; 1867 prefix = sin6mask2len(smask); 1868 1869 trace(1, "\tdeleting %s/%d from %s\n", 1870 inet6_n2p(addr), prefix, ifcp->ifc_name); 1871 ifa = ifa_match(ifcp, addr, prefix); 1872 if (!ifa) { 1873 trace(1, "\tno matching ifa found for %s/%d on %s\n", 1874 inet6_n2p(addr), prefix, ifcp->ifc_name); 1875 return -1; 1876 } 1877 if (ifa->ifa_conf != ifcp) { 1878 trace(1, "\taddress table corrupt: back pointer does not match " 1879 "(%s != %s)\n", 1880 ifcp->ifc_name, ifa->ifa_conf->ifc_name); 1881 return -1; 1882 } 1883 /* remove ifa from interface */ 1884 if (ifcp->ifc_addr == ifa) 1885 ifcp->ifc_addr = ifa->ifa_next; 1886 else { 1887 struct ifac *p; 1888 for (p = ifcp->ifc_addr; p; p = p->ifa_next) { 1889 if (p->ifa_next == ifa) { 1890 p->ifa_next = ifa->ifa_next; 1891 break; 1892 } 1893 } 1894 } 1895 ifa->ifa_next = NULL; 1896 ifa->ifa_conf = NULL; 1897 t_lifetime = time(NULL) - RIP_LIFETIME; 1898 /* age route for interface address */ 1899 memset(&ni6, 0, sizeof(ni6)); 1900 ni6.rip6_dest = ifa->ifa_addr; 1901 ni6.rip6_plen = ifa->ifa_plen; 1902 applyplen(&ni6.rip6_dest, ni6.rip6_plen); 1903 trace(1, "\tfind interface route %s/%d on %d\n", 1904 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index); 1905 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 1906 struct in6_addr none; 1907 memset(&none, 0, sizeof(none)); 1908 if (rrt->rrt_index == ifcp->ifc_index && 1909 (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) || 1910 IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) { 1911 trace(1, "\troute found, age it\n"); 1912 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1913 rrt->rrt_t = t_lifetime; 1914 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 1915 } 1916 updated++; 1917 } else { 1918 trace(1, "\tnon-interface route found: %s/%d on %d\n", 1919 inet6_n2p(&rrt->rrt_info.rip6_dest), 1920 rrt->rrt_info.rip6_plen, 1921 rrt->rrt_index); 1922 } 1923 } else 1924 trace(1, "\tno interface route found\n"); 1925 /* age route for p2p destination */ 1926 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1927 memset(&ni6, 0, sizeof(ni6)); 1928 ni6.rip6_dest = ifa->ifa_raddr; 1929 ni6.rip6_plen = 128; 1930 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 1931 trace(1, "\tfind p2p route %s/%d on %d\n", 1932 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, 1933 ifcp->ifc_index); 1934 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 1935 if (rrt->rrt_index == ifcp->ifc_index && 1936 IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) { 1937 trace(1, "\troute found, age it\n"); 1938 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1939 rrt->rrt_t = t_lifetime; 1940 rrt->rrt_info.rip6_metric = 1941 HOPCNT_INFINITY6; 1942 updated++; 1943 } 1944 } else { 1945 trace(1, "\tnon-p2p route found: %s/%d on %d\n", 1946 inet6_n2p(&rrt->rrt_info.rip6_dest), 1947 rrt->rrt_info.rip6_plen, 1948 rrt->rrt_index); 1949 } 1950 } else 1951 trace(1, "\tno p2p route found\n"); 1952 } 1953 return updated ? 0 : -1; 1954 } 1955 1956 /* 1957 * Get each interface address and put those interface routes to the route 1958 * list. 1959 */ 1960 int 1961 ifrt(ifcp, again) 1962 struct ifc *ifcp; 1963 int again; 1964 { 1965 struct ifac *ifa; 1966 struct riprt *rrt = NULL, *search_rrt, *prev_rrt, *loop_rrt; 1967 struct netinfo6 *np; 1968 time_t t_lifetime; 1969 int need_trigger = 0; 1970 1971 #if 0 1972 if (ifcp->ifc_flags & IFF_LOOPBACK) 1973 return 0; /* ignore loopback */ 1974 #endif 1975 1976 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1977 ifrt_p2p(ifcp, again); 1978 return 0; 1979 } 1980 1981 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 1982 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 1983 #if 0 1984 trace(1, "route: %s on %s: " 1985 "skip linklocal interface address\n", 1986 inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name); 1987 #endif 1988 continue; 1989 } 1990 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) { 1991 #if 0 1992 trace(1, "route: %s: skip unspec interface address\n", 1993 ifcp->ifc_name); 1994 #endif 1995 continue; 1996 } 1997 if (IN6_IS_ADDR_LOOPBACK(&ifa->ifa_addr)) { 1998 #if 0 1999 trace(1, "route: %s: skip loopback address\n", 2000 ifcp->ifc_name); 2001 #endif 2002 continue; 2003 } 2004 if (ifcp->ifc_flags & IFF_UP) { 2005 if ((rrt = MALLOC(struct riprt)) == NULL) 2006 fatal("malloc: struct riprt"); 2007 memset(rrt, 0, sizeof(*rrt)); 2008 rrt->rrt_same = NULL; 2009 rrt->rrt_index = ifcp->ifc_index; 2010 rrt->rrt_t = 0; /* don't age */ 2011 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2012 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2013 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2014 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 2015 if (ifa->ifa_plen == 128) 2016 rrt->rrt_flags = RTF_HOST; 2017 else 2018 rrt->rrt_flags = RTF_CLONING; 2019 rrt->rrt_rflags |= RRTF_CHANGED; 2020 applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen); 2021 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2022 rrt->rrt_gw = ifa->ifa_addr; 2023 np = &rrt->rrt_info; 2024 search_rrt = rtsearch(np, &prev_rrt); 2025 if (search_rrt != NULL) { 2026 if (search_rrt->rrt_info.rip6_metric <= 2027 rrt->rrt_info.rip6_metric) { 2028 /* Already have better route */ 2029 if (!again) { 2030 trace(1, "route: %s/%d: " 2031 "already registered (%s)\n", 2032 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2033 ifcp->ifc_name); 2034 } 2035 goto next; 2036 } 2037 2038 if (prev_rrt) 2039 prev_rrt->rrt_next = rrt->rrt_next; 2040 else 2041 riprt = rrt->rrt_next; 2042 delroute(&rrt->rrt_info, &rrt->rrt_gw); 2043 } 2044 /* Attach the route to the list */ 2045 trace(1, "route: %s/%d: register route (%s)\n", 2046 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2047 ifcp->ifc_name); 2048 rrt->rrt_next = riprt; 2049 riprt = rrt; 2050 addroute(rrt, &rrt->rrt_gw, ifcp); 2051 rrt = NULL; 2052 sendrequest(ifcp); 2053 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 2054 need_trigger = 1; 2055 } else { 2056 for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) { 2057 if (loop_rrt->rrt_index == ifcp->ifc_index) { 2058 t_lifetime = time(NULL) - RIP_LIFETIME; 2059 if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) { 2060 loop_rrt->rrt_t = t_lifetime; 2061 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 2062 loop_rrt->rrt_rflags |= RRTF_CHANGED; 2063 need_trigger = 1; 2064 } 2065 } 2066 } 2067 } 2068 next: 2069 if (rrt) 2070 free(rrt); 2071 } 2072 return need_trigger; 2073 } 2074 2075 /* 2076 * there are couple of p2p interface routing models. "behavior" lets 2077 * you pick one. it looks that gated behavior fits best with BSDs, 2078 * since BSD kernels do not look at prefix length on p2p interfaces. 2079 */ 2080 void 2081 ifrt_p2p(ifcp, again) 2082 struct ifc *ifcp; 2083 int again; 2084 { 2085 struct ifac *ifa; 2086 struct riprt *rrt, *orrt, *prevrrt; 2087 struct netinfo6 *np; 2088 struct in6_addr addr, dest; 2089 int advert, ignore, i; 2090 #define P2PADVERT_NETWORK 1 2091 #define P2PADVERT_ADDR 2 2092 #define P2PADVERT_DEST 4 2093 #define P2PADVERT_MAX 4 2094 const enum { CISCO, GATED, ROUTE6D } behavior = GATED; 2095 const char *category = ""; 2096 const char *noadv; 2097 2098 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2099 addr = ifa->ifa_addr; 2100 dest = ifa->ifa_raddr; 2101 applyplen(&addr, ifa->ifa_plen); 2102 applyplen(&dest, ifa->ifa_plen); 2103 advert = ignore = 0; 2104 switch (behavior) { 2105 case CISCO: 2106 /* 2107 * honor addr/plen, just like normal shared medium 2108 * interface. this may cause trouble if you reuse 2109 * addr/plen on other interfaces. 2110 * 2111 * advertise addr/plen. 2112 */ 2113 advert |= P2PADVERT_NETWORK; 2114 break; 2115 case GATED: 2116 /* 2117 * prefixlen on p2p interface is meaningless. 2118 * advertise addr/128 and dest/128. 2119 * 2120 * do not install network route to route6d routing 2121 * table (if we do, it would prevent route installation 2122 * for other p2p interface that shares addr/plen). 2123 * 2124 * XXX what should we do if dest is ::? it will not 2125 * get announced anyways (see following filter), 2126 * but we need to think. 2127 */ 2128 advert |= P2PADVERT_ADDR; 2129 advert |= P2PADVERT_DEST; 2130 ignore |= P2PADVERT_NETWORK; 2131 break; 2132 case ROUTE6D: 2133 /* 2134 * just for testing. actually the code is redundant 2135 * given the current p2p interface address assignment 2136 * rule for kame kernel. 2137 * 2138 * intent: 2139 * A/n -> announce A/n 2140 * A B/n, A and B share prefix -> A/n (= B/n) 2141 * A B/n, do not share prefix -> A/128 and B/128 2142 * actually, A/64 and A B/128 are the only cases 2143 * permitted by the kernel: 2144 * A/64 -> A/64 2145 * A B/128 -> A/128 and B/128 2146 */ 2147 if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) { 2148 if (IN6_ARE_ADDR_EQUAL(&addr, &dest)) 2149 advert |= P2PADVERT_NETWORK; 2150 else { 2151 advert |= P2PADVERT_ADDR; 2152 advert |= P2PADVERT_DEST; 2153 ignore |= P2PADVERT_NETWORK; 2154 } 2155 } else 2156 advert |= P2PADVERT_NETWORK; 2157 break; 2158 } 2159 2160 for (i = 1; i <= P2PADVERT_MAX; i *= 2) { 2161 if ((ignore & i) != 0) 2162 continue; 2163 if ((rrt = MALLOC(struct riprt)) == NULL) { 2164 fatal("malloc: struct riprt"); 2165 /*NOTREACHED*/ 2166 } 2167 memset(rrt, 0, sizeof(*rrt)); 2168 rrt->rrt_same = NULL; 2169 rrt->rrt_index = ifcp->ifc_index; 2170 rrt->rrt_t = 0; /* don't age */ 2171 switch (i) { 2172 case P2PADVERT_NETWORK: 2173 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2174 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 2175 applyplen(&rrt->rrt_info.rip6_dest, 2176 ifa->ifa_plen); 2177 category = "network"; 2178 break; 2179 case P2PADVERT_ADDR: 2180 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2181 rrt->rrt_info.rip6_plen = 128; 2182 rrt->rrt_gw = in6addr_loopback; 2183 category = "addr"; 2184 break; 2185 case P2PADVERT_DEST: 2186 rrt->rrt_info.rip6_dest = ifa->ifa_raddr; 2187 rrt->rrt_info.rip6_plen = 128; 2188 rrt->rrt_gw = ifa->ifa_addr; 2189 category = "dest"; 2190 break; 2191 } 2192 if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) || 2193 IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) { 2194 #if 0 2195 trace(1, "route: %s: skip unspec/linklocal " 2196 "(%s on %s)\n", category, ifcp->ifc_name); 2197 #endif 2198 free(rrt); 2199 continue; 2200 } 2201 if ((advert & i) == 0) { 2202 rrt->rrt_rflags |= RRTF_NOADVERTISE; 2203 noadv = ", NO-ADV"; 2204 } else 2205 noadv = ""; 2206 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2207 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2208 np = &rrt->rrt_info; 2209 orrt = rtsearch(np, &prevrrt); 2210 if (!orrt) { 2211 /* Attach the route to the list */ 2212 trace(1, "route: %s/%d: register route " 2213 "(%s on %s%s)\n", 2214 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2215 category, ifcp->ifc_name, noadv); 2216 rrt->rrt_next = riprt; 2217 riprt = rrt; 2218 } else if (rrt->rrt_index != orrt->rrt_index || 2219 rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) { 2220 /* swap route */ 2221 rrt->rrt_next = orrt->rrt_next; 2222 if (prevrrt) 2223 prevrrt->rrt_next = rrt; 2224 else 2225 riprt = rrt; 2226 free(orrt); 2227 2228 trace(1, "route: %s/%d: update (%s on %s%s)\n", 2229 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2230 category, ifcp->ifc_name, noadv); 2231 } else { 2232 /* Already found */ 2233 if (!again) { 2234 trace(1, "route: %s/%d: " 2235 "already registered (%s on %s%s)\n", 2236 inet6_n2p(&np->rip6_dest), 2237 np->rip6_plen, category, 2238 ifcp->ifc_name, noadv); 2239 } 2240 free(rrt); 2241 } 2242 } 2243 } 2244 #undef P2PADVERT_NETWORK 2245 #undef P2PADVERT_ADDR 2246 #undef P2PADVERT_DEST 2247 #undef P2PADVERT_MAX 2248 } 2249 2250 int 2251 getifmtu(ifindex) 2252 int ifindex; 2253 { 2254 int mib[6]; 2255 char *buf; 2256 size_t msize; 2257 struct if_msghdr *ifm; 2258 int mtu; 2259 2260 mib[0] = CTL_NET; 2261 mib[1] = PF_ROUTE; 2262 mib[2] = 0; 2263 mib[3] = AF_INET6; 2264 mib[4] = NET_RT_IFLIST; 2265 mib[5] = ifindex; 2266 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2267 fatal("sysctl estimate NET_RT_IFLIST"); 2268 /*NOTREACHED*/ 2269 } 2270 if ((buf = malloc(msize)) == NULL) { 2271 fatal("malloc"); 2272 /*NOTREACHED*/ 2273 } 2274 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2275 fatal("sysctl NET_RT_IFLIST"); 2276 /*NOTREACHED*/ 2277 } 2278 ifm = (struct if_msghdr *)buf; 2279 mtu = ifm->ifm_data.ifi_mtu; 2280 #ifdef __FreeBSD__ 2281 if (ifindex != ifm->ifm_index) { 2282 fatal("ifindex does not match with ifm_index"); 2283 /*NOTREACHED*/ 2284 } 2285 #endif 2286 free(buf); 2287 return mtu; 2288 } 2289 2290 const char * 2291 rttypes(rtm) 2292 struct rt_msghdr *rtm; 2293 { 2294 #define RTTYPE(s, f) \ 2295 do { \ 2296 if (rtm->rtm_type == (f)) \ 2297 return (s); \ 2298 } while (0) 2299 RTTYPE("ADD", RTM_ADD); 2300 RTTYPE("DELETE", RTM_DELETE); 2301 RTTYPE("CHANGE", RTM_CHANGE); 2302 RTTYPE("GET", RTM_GET); 2303 RTTYPE("LOSING", RTM_LOSING); 2304 RTTYPE("REDIRECT", RTM_REDIRECT); 2305 RTTYPE("MISS", RTM_MISS); 2306 RTTYPE("LOCK", RTM_LOCK); 2307 RTTYPE("OLDADD", RTM_OLDADD); 2308 RTTYPE("OLDDEL", RTM_OLDDEL); 2309 RTTYPE("RESOLVE", RTM_RESOLVE); 2310 RTTYPE("NEWADDR", RTM_NEWADDR); 2311 RTTYPE("DELADDR", RTM_DELADDR); 2312 RTTYPE("IFINFO", RTM_IFINFO); 2313 #ifdef RTM_OLDADD 2314 RTTYPE("OLDADD", RTM_OLDADD); 2315 #endif 2316 #ifdef RTM_OLDDEL 2317 RTTYPE("OLDDEL", RTM_OLDDEL); 2318 #endif 2319 #ifdef RTM_OIFINFO 2320 RTTYPE("OIFINFO", RTM_OIFINFO); 2321 #endif 2322 #ifdef RTM_IFANNOUNCE 2323 RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE); 2324 #endif 2325 #ifdef RTM_NEWMADDR 2326 RTTYPE("NEWMADDR", RTM_NEWMADDR); 2327 #endif 2328 #ifdef RTM_DELMADDR 2329 RTTYPE("DELMADDR", RTM_DELMADDR); 2330 #endif 2331 #undef RTTYPE 2332 return NULL; 2333 } 2334 2335 const char * 2336 rtflags(rtm) 2337 struct rt_msghdr *rtm; 2338 { 2339 static char buf[BUFSIZ]; 2340 2341 /* 2342 * letter conflict should be okay. painful when *BSD diverges... 2343 */ 2344 strlcpy(buf, "", sizeof(buf)); 2345 #define RTFLAG(s, f) \ 2346 do { \ 2347 if (rtm->rtm_flags & (f)) \ 2348 strlcat(buf, (s), sizeof(buf)); \ 2349 } while (0) 2350 RTFLAG("U", RTF_UP); 2351 RTFLAG("G", RTF_GATEWAY); 2352 RTFLAG("H", RTF_HOST); 2353 RTFLAG("R", RTF_REJECT); 2354 RTFLAG("D", RTF_DYNAMIC); 2355 RTFLAG("M", RTF_MODIFIED); 2356 RTFLAG("d", RTF_DONE); 2357 #ifdef RTF_MASK 2358 RTFLAG("m", RTF_MASK); 2359 #endif 2360 RTFLAG("C", RTF_CLONING); 2361 #ifdef RTF_CLONED 2362 RTFLAG("c", RTF_CLONED); 2363 #endif 2364 #ifdef RTF_PRCLONING 2365 RTFLAG("c", RTF_PRCLONING); 2366 #endif 2367 #ifdef RTF_WASCLONED 2368 RTFLAG("W", RTF_WASCLONED); 2369 #endif 2370 RTFLAG("X", RTF_XRESOLVE); 2371 RTFLAG("L", RTF_LLINFO); 2372 RTFLAG("S", RTF_STATIC); 2373 RTFLAG("B", RTF_BLACKHOLE); 2374 #ifdef RTF_PROTO3 2375 RTFLAG("3", RTF_PROTO3); 2376 #endif 2377 RTFLAG("2", RTF_PROTO2); 2378 RTFLAG("1", RTF_PROTO1); 2379 #ifdef RTF_BROADCAST 2380 RTFLAG("b", RTF_BROADCAST); 2381 #endif 2382 #ifdef RTF_DEFAULT 2383 RTFLAG("d", RTF_DEFAULT); 2384 #endif 2385 #ifdef RTF_ISAROUTER 2386 RTFLAG("r", RTF_ISAROUTER); 2387 #endif 2388 #ifdef RTF_TUNNEL 2389 RTFLAG("T", RTF_TUNNEL); 2390 #endif 2391 #ifdef RTF_AUTH 2392 RTFLAG("A", RTF_AUTH); 2393 #endif 2394 #ifdef RTF_CRYPT 2395 RTFLAG("E", RTF_CRYPT); 2396 #endif 2397 #undef RTFLAG 2398 return buf; 2399 } 2400 2401 const char * 2402 ifflags(flags) 2403 int flags; 2404 { 2405 static char buf[BUFSIZ]; 2406 2407 strlcpy(buf, "", sizeof(buf)); 2408 #define IFFLAG(s, f) \ 2409 do { \ 2410 if (flags & (f)) { \ 2411 if (buf[0]) \ 2412 strlcat(buf, ",", sizeof(buf)); \ 2413 strlcat(buf, (s), sizeof(buf)); \ 2414 } \ 2415 } while (0) 2416 IFFLAG("UP", IFF_UP); 2417 IFFLAG("BROADCAST", IFF_BROADCAST); 2418 IFFLAG("DEBUG", IFF_DEBUG); 2419 IFFLAG("LOOPBACK", IFF_LOOPBACK); 2420 IFFLAG("POINTOPOINT", IFF_POINTOPOINT); 2421 #ifdef IFF_NOTRAILERS 2422 IFFLAG("NOTRAILERS", IFF_NOTRAILERS); 2423 #endif 2424 #ifdef IFF_SMART 2425 IFFLAG("SMART", IFF_SMART); 2426 #endif 2427 IFFLAG("RUNNING", IFF_RUNNING); 2428 IFFLAG("NOARP", IFF_NOARP); 2429 IFFLAG("PROMISC", IFF_PROMISC); 2430 IFFLAG("ALLMULTI", IFF_ALLMULTI); 2431 IFFLAG("OACTIVE", IFF_OACTIVE); 2432 IFFLAG("SIMPLEX", IFF_SIMPLEX); 2433 IFFLAG("LINK0", IFF_LINK0); 2434 IFFLAG("LINK1", IFF_LINK1); 2435 IFFLAG("LINK2", IFF_LINK2); 2436 IFFLAG("MULTICAST", IFF_MULTICAST); 2437 #undef IFFLAG 2438 return buf; 2439 } 2440 2441 void 2442 krtread(again) 2443 int again; 2444 { 2445 int mib[6]; 2446 size_t msize; 2447 char *buf, *p, *lim; 2448 struct rt_msghdr *rtm; 2449 int retry; 2450 const char *errmsg; 2451 2452 retry = 0; 2453 buf = NULL; 2454 mib[0] = CTL_NET; 2455 mib[1] = PF_ROUTE; 2456 mib[2] = 0; 2457 mib[3] = AF_INET6; /* Address family */ 2458 mib[4] = NET_RT_DUMP; /* Dump the kernel routing table */ 2459 mib[5] = 0; /* No flags */ 2460 do { 2461 retry++; 2462 errmsg = NULL; 2463 if (buf) 2464 free(buf); 2465 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2466 errmsg = "sysctl estimate"; 2467 continue; 2468 } 2469 if ((buf = malloc(msize)) == NULL) { 2470 errmsg = "malloc"; 2471 continue; 2472 } 2473 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2474 errmsg = "sysctl NET_RT_DUMP"; 2475 continue; 2476 } 2477 } while (retry < 5 && errmsg != NULL); 2478 if (errmsg) { 2479 fatal("%s (with %d retries, msize=%lu)", errmsg, retry, 2480 (u_long)msize); 2481 /*NOTREACHED*/ 2482 } else if (1 < retry) 2483 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry); 2484 2485 lim = buf + msize; 2486 for (p = buf; p < lim; p += rtm->rtm_msglen) { 2487 rtm = (struct rt_msghdr *)p; 2488 rt_entry(rtm, again); 2489 } 2490 free(buf); 2491 } 2492 2493 void 2494 rt_entry(rtm, again) 2495 struct rt_msghdr *rtm; 2496 int again; 2497 { 2498 struct sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask; 2499 struct sockaddr_in6 *sin6_genmask, *sin6_ifp; 2500 char *rtmp, *ifname = NULL; 2501 struct riprt *rrt, *orrt; 2502 struct netinfo6 *np; 2503 int s; 2504 2505 sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0; 2506 if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags & 2507 (RTF_CLONING|RTF_XRESOLVE|RTF_LLINFO|RTF_BLACKHOLE)) { 2508 return; /* not interested in the link route */ 2509 } 2510 /* do not look at cloned routes */ 2511 #ifdef RTF_WASCLONED 2512 if (rtm->rtm_flags & RTF_WASCLONED) 2513 return; 2514 #endif 2515 #ifdef RTF_CLONED 2516 if (rtm->rtm_flags & RTF_CLONED) 2517 return; 2518 #endif 2519 /* 2520 * do not look at dynamic routes. 2521 * netbsd/openbsd cloned routes have UGHD. 2522 */ 2523 if (rtm->rtm_flags & RTF_DYNAMIC) 2524 return; 2525 rtmp = (char *)(rtm + 1); 2526 /* Destination */ 2527 if ((rtm->rtm_addrs & RTA_DST) == 0) 2528 return; /* ignore routes without destination address */ 2529 sin6_dst = (struct sockaddr_in6 *)rtmp; 2530 rtmp += ROUNDUP(sin6_dst->sin6_len); 2531 if (rtm->rtm_addrs & RTA_GATEWAY) { 2532 sin6_gw = (struct sockaddr_in6 *)rtmp; 2533 rtmp += ROUNDUP(sin6_gw->sin6_len); 2534 } 2535 if (rtm->rtm_addrs & RTA_NETMASK) { 2536 sin6_mask = (struct sockaddr_in6 *)rtmp; 2537 rtmp += ROUNDUP(sin6_mask->sin6_len); 2538 } 2539 if (rtm->rtm_addrs & RTA_GENMASK) { 2540 sin6_genmask = (struct sockaddr_in6 *)rtmp; 2541 rtmp += ROUNDUP(sin6_genmask->sin6_len); 2542 } 2543 if (rtm->rtm_addrs & RTA_IFP) { 2544 sin6_ifp = (struct sockaddr_in6 *)rtmp; 2545 rtmp += ROUNDUP(sin6_ifp->sin6_len); 2546 } 2547 2548 /* Destination */ 2549 if (sin6_dst->sin6_family != AF_INET6) 2550 return; 2551 if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr)) 2552 return; /* Link-local */ 2553 if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback)) 2554 return; /* Loopback */ 2555 if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr)) 2556 return; 2557 2558 if ((rrt = MALLOC(struct riprt)) == NULL) { 2559 fatal("malloc: struct riprt"); 2560 /*NOTREACHED*/ 2561 } 2562 memset(rrt, 0, sizeof(*rrt)); 2563 np = &rrt->rrt_info; 2564 rrt->rrt_same = NULL; 2565 rrt->rrt_t = time(NULL); 2566 if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC)) 2567 rrt->rrt_t = 0; /* Don't age static routes */ 2568 np->rip6_tag = 0; 2569 np->rip6_metric = rtm->rtm_rmx.rmx_hopcount; 2570 if (np->rip6_metric < 1) 2571 np->rip6_metric = 1; 2572 rrt->rrt_flags = rtm->rtm_flags; 2573 np->rip6_dest = sin6_dst->sin6_addr; 2574 2575 /* Mask or plen */ 2576 if (rtm->rtm_flags & RTF_HOST) 2577 np->rip6_plen = 128; /* Host route */ 2578 else if (sin6_mask) 2579 np->rip6_plen = sin6mask2len(sin6_mask); 2580 else 2581 np->rip6_plen = 0; 2582 2583 orrt = rtsearch(np, NULL); 2584 if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) { 2585 /* Already found */ 2586 if (!again) { 2587 trace(1, "route: %s/%d flags %s: already registered\n", 2588 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2589 rtflags(rtm)); 2590 } 2591 free(rrt); 2592 return; 2593 } 2594 /* Gateway */ 2595 if (!sin6_gw) 2596 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2597 else { 2598 if (sin6_gw->sin6_family == AF_INET6) 2599 rrt->rrt_gw = sin6_gw->sin6_addr; 2600 else if (sin6_gw->sin6_family == AF_LINK) { 2601 /* XXX in case ppp link? */ 2602 rrt->rrt_gw = in6addr_loopback; 2603 } else 2604 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2605 } 2606 trace(1, "route: %s/%d flags %s", 2607 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm)); 2608 trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw)); 2609 2610 /* Interface */ 2611 s = rtm->rtm_index; 2612 if (s < nindex2ifc && index2ifc[s]) 2613 ifname = index2ifc[s]->ifc_name; 2614 else { 2615 trace(1, " not configured\n"); 2616 free(rrt); 2617 return; 2618 } 2619 trace(1, " if %s sock %d", ifname, s); 2620 rrt->rrt_index = s; 2621 2622 trace(1, "\n"); 2623 2624 /* Check gateway */ 2625 if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) && 2626 !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw) 2627 #ifdef __FreeBSD__ 2628 && (rrt->rrt_flags & RTF_LOCAL) == 0 2629 #endif 2630 ) { 2631 trace(0, "***** Gateway %s is not a link-local address.\n", 2632 inet6_n2p(&rrt->rrt_gw)); 2633 trace(0, "***** dest(%s) if(%s) -- Not optimized.\n", 2634 inet6_n2p(&rrt->rrt_info.rip6_dest), ifname); 2635 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR; 2636 } 2637 2638 /* Put it to the route list */ 2639 if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) { 2640 /* replace route list */ 2641 rrt->rrt_next = orrt->rrt_next; 2642 *orrt = *rrt; 2643 trace(1, "route: %s/%d flags %s: replace new route\n", 2644 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2645 rtflags(rtm)); 2646 free(rrt); 2647 } else { 2648 rrt->rrt_next = riprt; 2649 riprt = rrt; 2650 } 2651 } 2652 2653 int 2654 addroute(rrt, gw, ifcp) 2655 struct riprt *rrt; 2656 const struct in6_addr *gw; 2657 struct ifc *ifcp; 2658 { 2659 struct netinfo6 *np; 2660 u_char buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ]; 2661 struct rt_msghdr *rtm; 2662 struct sockaddr_in6 *sin6; 2663 int len; 2664 2665 np = &rrt->rrt_info; 2666 inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1)); 2667 inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2)); 2668 tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n", 2669 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2670 np->rip6_metric - 1, buf2); 2671 if (rtlog) 2672 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(), 2673 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2674 np->rip6_metric - 1, buf2); 2675 if (nflag) 2676 return 0; 2677 2678 memset(buf, 0, sizeof(buf)); 2679 rtm = (struct rt_msghdr *)buf; 2680 rtm->rtm_type = RTM_ADD; 2681 rtm->rtm_version = RTM_VERSION; 2682 rtm->rtm_seq = ++seq; 2683 rtm->rtm_pid = pid; 2684 rtm->rtm_flags = rrt->rrt_flags; 2685 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2686 rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1; 2687 rtm->rtm_inits = RTV_HOPCOUNT; 2688 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2689 /* Destination */ 2690 sin6->sin6_len = sizeof(struct sockaddr_in6); 2691 sin6->sin6_family = AF_INET6; 2692 sin6->sin6_addr = np->rip6_dest; 2693 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2694 /* Gateway */ 2695 sin6->sin6_len = sizeof(struct sockaddr_in6); 2696 sin6->sin6_family = AF_INET6; 2697 sin6->sin6_addr = *gw; 2698 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2699 /* Netmask */ 2700 sin6->sin6_len = sizeof(struct sockaddr_in6); 2701 sin6->sin6_family = AF_INET6; 2702 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2703 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2704 2705 len = (char *)sin6 - (char *)buf; 2706 rtm->rtm_msglen = len; 2707 if (write(rtsock, buf, len) > 0) 2708 return 0; 2709 2710 if (errno == EEXIST) { 2711 trace(0, "ADD: Route already exists %s/%d gw %s\n", 2712 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2713 if (rtlog) 2714 fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n", 2715 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2716 } else { 2717 trace(0, "Can not write to rtsock (addroute): %s\n", 2718 strerror(errno)); 2719 if (rtlog) 2720 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2721 strerror(errno)); 2722 } 2723 return -1; 2724 } 2725 2726 int 2727 delroute(np, gw) 2728 struct netinfo6 *np; 2729 struct in6_addr *gw; 2730 { 2731 u_char buf[BUFSIZ], buf2[BUFSIZ]; 2732 struct rt_msghdr *rtm; 2733 struct sockaddr_in6 *sin6; 2734 int len; 2735 2736 inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2)); 2737 tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest), 2738 np->rip6_plen, buf2); 2739 if (rtlog) 2740 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n", 2741 hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2742 if (nflag) 2743 return 0; 2744 2745 memset(buf, 0, sizeof(buf)); 2746 rtm = (struct rt_msghdr *)buf; 2747 rtm->rtm_type = RTM_DELETE; 2748 rtm->rtm_version = RTM_VERSION; 2749 rtm->rtm_seq = ++seq; 2750 rtm->rtm_pid = pid; 2751 rtm->rtm_flags = RTF_UP | RTF_GATEWAY; 2752 if (np->rip6_plen == sizeof(struct in6_addr) * 8) 2753 rtm->rtm_flags |= RTF_HOST; 2754 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2755 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2756 /* Destination */ 2757 sin6->sin6_len = sizeof(struct sockaddr_in6); 2758 sin6->sin6_family = AF_INET6; 2759 sin6->sin6_addr = np->rip6_dest; 2760 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2761 /* Gateway */ 2762 sin6->sin6_len = sizeof(struct sockaddr_in6); 2763 sin6->sin6_family = AF_INET6; 2764 sin6->sin6_addr = *gw; 2765 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2766 /* Netmask */ 2767 sin6->sin6_len = sizeof(struct sockaddr_in6); 2768 sin6->sin6_family = AF_INET6; 2769 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2770 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2771 2772 len = (char *)sin6 - (char *)buf; 2773 rtm->rtm_msglen = len; 2774 if (write(rtsock, buf, len) >= 0) 2775 return 0; 2776 2777 if (errno == ESRCH) { 2778 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n", 2779 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2780 if (rtlog) 2781 fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n", 2782 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2783 } else { 2784 trace(0, "Can not write to rtsock (delroute): %s\n", 2785 strerror(errno)); 2786 if (rtlog) 2787 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2788 strerror(errno)); 2789 } 2790 return -1; 2791 } 2792 2793 struct in6_addr * 2794 getroute(np, gw) 2795 struct netinfo6 *np; 2796 struct in6_addr *gw; 2797 { 2798 u_char buf[BUFSIZ]; 2799 u_long myseq; 2800 int len; 2801 struct rt_msghdr *rtm; 2802 struct sockaddr_in6 *sin6; 2803 2804 rtm = (struct rt_msghdr *)buf; 2805 len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6); 2806 memset(rtm, 0, len); 2807 rtm->rtm_type = RTM_GET; 2808 rtm->rtm_version = RTM_VERSION; 2809 myseq = ++seq; 2810 rtm->rtm_seq = myseq; 2811 rtm->rtm_addrs = RTA_DST; 2812 rtm->rtm_msglen = len; 2813 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2814 sin6->sin6_len = sizeof(struct sockaddr_in6); 2815 sin6->sin6_family = AF_INET6; 2816 sin6->sin6_addr = np->rip6_dest; 2817 if (write(rtsock, buf, len) < 0) { 2818 if (errno == ESRCH) /* No such route found */ 2819 return NULL; 2820 perror("write to rtsock"); 2821 exit(1); 2822 } 2823 do { 2824 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 2825 perror("read from rtsock"); 2826 exit(1); 2827 } 2828 rtm = (struct rt_msghdr *)buf; 2829 } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid); 2830 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2831 if (rtm->rtm_addrs & RTA_DST) { 2832 sin6 = (struct sockaddr_in6 *) 2833 ((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2834 } 2835 if (rtm->rtm_addrs & RTA_GATEWAY) { 2836 *gw = sin6->sin6_addr; 2837 return gw; 2838 } 2839 return NULL; 2840 } 2841 2842 const char * 2843 inet6_n2p(p) 2844 const struct in6_addr *p; 2845 { 2846 static char buf[BUFSIZ]; 2847 2848 return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf)); 2849 } 2850 2851 void 2852 ifrtdump(sig) 2853 int sig; 2854 { 2855 2856 ifdump(sig); 2857 rtdump(sig); 2858 } 2859 2860 void 2861 ifdump(sig) 2862 int sig; 2863 { 2864 struct ifc *ifcp; 2865 FILE *dump; 2866 int i; 2867 2868 if (sig == 0) 2869 dump = stderr; 2870 else 2871 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 2872 dump = stderr; 2873 2874 fprintf(dump, "%s: Interface Table Dump\n", hms()); 2875 fprintf(dump, " Number of interfaces: %d\n", nifc); 2876 for (i = 0; i < 2; i++) { 2877 fprintf(dump, " %sadvertising interfaces:\n", i ? "non-" : ""); 2878 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 2879 if (i == 0) { 2880 if ((ifcp->ifc_flags & IFF_UP) == 0) 2881 continue; 2882 if (iff_find(ifcp, 'N') != NULL) 2883 continue; 2884 } else { 2885 if (ifcp->ifc_flags & IFF_UP) 2886 continue; 2887 } 2888 ifdump0(dump, ifcp); 2889 } 2890 } 2891 fprintf(dump, "\n"); 2892 if (dump != stderr) 2893 fclose(dump); 2894 } 2895 2896 void 2897 ifdump0(dump, ifcp) 2898 FILE *dump; 2899 const struct ifc *ifcp; 2900 { 2901 struct ifac *ifa; 2902 struct iff *iffp; 2903 char buf[BUFSIZ]; 2904 const char *ft; 2905 int addr; 2906 2907 fprintf(dump, " %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n", 2908 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags), 2909 inet6_n2p(&ifcp->ifc_mylladdr), 2910 ifcp->ifc_mtu, ifcp->ifc_metric); 2911 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2912 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 2913 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, 2914 buf, sizeof(buf)); 2915 fprintf(dump, "\t%s/%d -- %s\n", 2916 inet6_n2p(&ifa->ifa_addr), 2917 ifa->ifa_plen, buf); 2918 } else { 2919 fprintf(dump, "\t%s/%d\n", 2920 inet6_n2p(&ifa->ifa_addr), 2921 ifa->ifa_plen); 2922 } 2923 } 2924 if (ifcp->ifc_filter) { 2925 fprintf(dump, "\tFilter:"); 2926 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 2927 addr = 0; 2928 switch (iffp->iff_type) { 2929 case 'A': 2930 ft = "Aggregate"; addr++; break; 2931 case 'N': 2932 ft = "No-use"; break; 2933 case 'O': 2934 ft = "Advertise-only"; addr++; break; 2935 case 'T': 2936 ft = "Default-only"; break; 2937 case 'L': 2938 ft = "Listen-only"; addr++; break; 2939 default: 2940 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type); 2941 ft = buf; 2942 addr++; 2943 break; 2944 } 2945 fprintf(dump, " %s", ft); 2946 if (addr) { 2947 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr), 2948 iffp->iff_plen); 2949 } 2950 } 2951 fprintf(dump, "\n"); 2952 } 2953 } 2954 2955 void 2956 rtdump(sig) 2957 int sig; 2958 { 2959 struct riprt *rrt; 2960 char buf[BUFSIZ]; 2961 FILE *dump; 2962 time_t t, age; 2963 2964 if (sig == 0) 2965 dump = stderr; 2966 else 2967 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 2968 dump = stderr; 2969 2970 t = time(NULL); 2971 fprintf(dump, "\n%s: Routing Table Dump\n", hms()); 2972 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 2973 if (rrt->rrt_t == 0) 2974 age = 0; 2975 else 2976 age = t - rrt->rrt_t; 2977 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest, 2978 buf, sizeof(buf)); 2979 fprintf(dump, " %s/%d if(%d:%s) gw(%s) [%d] age(%ld)", 2980 buf, rrt->rrt_info.rip6_plen, rrt->rrt_index, 2981 index2ifc[rrt->rrt_index]->ifc_name, 2982 inet6_n2p(&rrt->rrt_gw), 2983 rrt->rrt_info.rip6_metric, (long)age); 2984 if (rrt->rrt_info.rip6_tag) { 2985 fprintf(dump, " tag(0x%04x)", 2986 ntohs(rrt->rrt_info.rip6_tag) & 0xffff); 2987 } 2988 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) 2989 fprintf(dump, " NOT-LL"); 2990 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 2991 fprintf(dump, " NO-ADV"); 2992 fprintf(dump, "\n"); 2993 } 2994 fprintf(dump, "\n"); 2995 if (dump != stderr) 2996 fclose(dump); 2997 } 2998 2999 /* 3000 * Parse the -A (and -O) options and put corresponding filter object to the 3001 * specified interface structures. Each of the -A/O option has the following 3002 * syntax: -A 5f09:c400::/32,ef0,ef1 (aggregate) 3003 * -O 5f09:c400::/32,ef0,ef1 (only when match) 3004 */ 3005 void 3006 filterconfig() 3007 { 3008 int i; 3009 char *p, *ap, *iflp, *ifname; 3010 struct iff ftmp, *iff_obj; 3011 struct ifc *ifcp; 3012 struct riprt *rrt; 3013 #if 0 3014 struct in6_addr gw; 3015 #endif 3016 3017 for (i = 0; i < nfilter; i++) { 3018 ap = filter[i]; 3019 iflp = NULL; 3020 ifcp = NULL; 3021 if (filtertype[i] == 'N' || filtertype[i] == 'T') { 3022 iflp = ap; 3023 goto ifonly; 3024 } 3025 if ((p = index(ap, ',')) != NULL) { 3026 *p++ = '\0'; 3027 iflp = p; 3028 } 3029 if ((p = index(ap, '/')) == NULL) { 3030 fatal("no prefixlen specified for '%s'", ap); 3031 /*NOTREACHED*/ 3032 } 3033 *p++ = '\0'; 3034 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) { 3035 fatal("invalid prefix specified for '%s'", ap); 3036 /*NOTREACHED*/ 3037 } 3038 ftmp.iff_plen = atoi(p); 3039 ftmp.iff_next = NULL; 3040 applyplen(&ftmp.iff_addr, ftmp.iff_plen); 3041 ifonly: 3042 ftmp.iff_type = filtertype[i]; 3043 if (iflp == NULL || *iflp == '\0') { 3044 fatal("no interface specified for '%s'", ap); 3045 /*NOTREACHED*/ 3046 } 3047 /* parse the interface listing portion */ 3048 while (iflp) { 3049 ifname = iflp; 3050 if ((iflp = index(iflp, ',')) != NULL) 3051 *iflp++ = '\0'; 3052 ifcp = ifc_find(ifname); 3053 if (ifcp == NULL) { 3054 fatal("no interface %s exists", ifname); 3055 /*NOTREACHED*/ 3056 } 3057 iff_obj = (struct iff *)malloc(sizeof(struct iff)); 3058 if (iff_obj == NULL) { 3059 fatal("malloc of iff_obj"); 3060 /*NOTREACHED*/ 3061 } 3062 memcpy((void *)iff_obj, (void *)&ftmp, 3063 sizeof(struct iff)); 3064 /* link it to the interface filter */ 3065 iff_obj->iff_next = ifcp->ifc_filter; 3066 ifcp->ifc_filter = iff_obj; 3067 } 3068 3069 /* 3070 * -A: aggregate configuration. 3071 */ 3072 if (filtertype[i] != 'A') 3073 continue; 3074 /* put the aggregate to the kernel routing table */ 3075 rrt = (struct riprt *)malloc(sizeof(struct riprt)); 3076 if (rrt == NULL) { 3077 fatal("malloc: rrt"); 3078 /*NOTREACHED*/ 3079 } 3080 memset(rrt, 0, sizeof(struct riprt)); 3081 rrt->rrt_info.rip6_dest = ftmp.iff_addr; 3082 rrt->rrt_info.rip6_plen = ftmp.iff_plen; 3083 rrt->rrt_info.rip6_metric = 1; 3084 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 3085 rrt->rrt_gw = in6addr_loopback; 3086 rrt->rrt_flags = RTF_UP | RTF_REJECT; 3087 rrt->rrt_rflags = RRTF_AGGREGATE; 3088 rrt->rrt_t = 0; 3089 rrt->rrt_index = loopifcp->ifc_index; 3090 #if 0 3091 if (getroute(&rrt->rrt_info, &gw)) { 3092 #if 0 3093 /* 3094 * When the address has already been registered in the 3095 * kernel routing table, it should be removed 3096 */ 3097 delroute(&rrt->rrt_info, &gw); 3098 #else 3099 /* it is safer behavior */ 3100 errno = EINVAL; 3101 fatal("%s/%u already in routing table, " 3102 "cannot aggregate", 3103 inet6_n2p(&rrt->rrt_info.rip6_dest), 3104 rrt->rrt_info.rip6_plen); 3105 /*NOTREACHED*/ 3106 #endif 3107 } 3108 #endif 3109 /* Put the route to the list */ 3110 rrt->rrt_next = riprt; 3111 riprt = rrt; 3112 trace(1, "Aggregate: %s/%d for %s\n", 3113 inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen, 3114 ifcp->ifc_name); 3115 /* Add this route to the kernel */ 3116 if (nflag) /* do not modify kernel routing table */ 3117 continue; 3118 addroute(rrt, &in6addr_loopback, loopifcp); 3119 } 3120 } 3121 3122 /***************** utility functions *****************/ 3123 3124 /* 3125 * Returns a pointer to ifac whose address and prefix length matches 3126 * with the address and prefix length specified in the arguments. 3127 */ 3128 struct ifac * 3129 ifa_match(ifcp, ia, plen) 3130 const struct ifc *ifcp; 3131 const struct in6_addr *ia; 3132 int plen; 3133 { 3134 struct ifac *ifa; 3135 3136 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 3137 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) && 3138 ifa->ifa_plen == plen) 3139 break; 3140 } 3141 return ifa; 3142 } 3143 3144 /* 3145 * Return a pointer to riprt structure whose address and prefix length 3146 * matches with the address and prefix length found in the argument. 3147 * Note: This is not a rtalloc(). Therefore exact match is necessary. 3148 */ 3149 struct riprt * 3150 rtsearch(np, prev_rrt) 3151 struct netinfo6 *np; 3152 struct riprt **prev_rrt; 3153 { 3154 struct riprt *rrt; 3155 3156 if (prev_rrt) 3157 *prev_rrt = NULL; 3158 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 3159 if (rrt->rrt_info.rip6_plen == np->rip6_plen && 3160 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 3161 &np->rip6_dest)) 3162 return rrt; 3163 if (prev_rrt) 3164 *prev_rrt = rrt; 3165 } 3166 if (prev_rrt) 3167 *prev_rrt = NULL; 3168 return 0; 3169 } 3170 3171 int 3172 sin6mask2len(sin6) 3173 const struct sockaddr_in6 *sin6; 3174 { 3175 3176 return mask2len(&sin6->sin6_addr, 3177 sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr)); 3178 } 3179 3180 int 3181 mask2len(addr, lenlim) 3182 const struct in6_addr *addr; 3183 int lenlim; 3184 { 3185 int i = 0, j; 3186 const u_char *p = (const u_char *)addr; 3187 3188 for (j = 0; j < lenlim; j++, p++) { 3189 if (*p != 0xff) 3190 break; 3191 i += 8; 3192 } 3193 if (j < lenlim) { 3194 switch (*p) { 3195 #define MASKLEN(m, l) case m: do { i += l; break; } while (0) 3196 MASKLEN(0xfe, 7); break; 3197 MASKLEN(0xfc, 6); break; 3198 MASKLEN(0xf8, 5); break; 3199 MASKLEN(0xf0, 4); break; 3200 MASKLEN(0xe0, 3); break; 3201 MASKLEN(0xc0, 2); break; 3202 MASKLEN(0x80, 1); break; 3203 #undef MASKLEN 3204 } 3205 } 3206 return i; 3207 } 3208 3209 void 3210 applymask(addr, mask) 3211 struct in6_addr *addr, *mask; 3212 { 3213 int i; 3214 u_long *p, *q; 3215 3216 p = (u_long *)addr; q = (u_long *)mask; 3217 for (i = 0; i < 4; i++) 3218 *p++ &= *q++; 3219 } 3220 3221 static const u_char plent[8] = { 3222 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe 3223 }; 3224 3225 void 3226 applyplen(ia, plen) 3227 struct in6_addr *ia; 3228 int plen; 3229 { 3230 u_char *p; 3231 int i; 3232 3233 p = ia->s6_addr; 3234 for (i = 0; i < 16; i++) { 3235 if (plen <= 0) 3236 *p = 0; 3237 else if (plen < 8) 3238 *p &= plent[plen]; 3239 p++, plen -= 8; 3240 } 3241 } 3242 3243 static const int pl2m[9] = { 3244 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff 3245 }; 3246 3247 struct in6_addr * 3248 plen2mask(n) 3249 int n; 3250 { 3251 static struct in6_addr ia; 3252 u_char *p; 3253 int i; 3254 3255 memset(&ia, 0, sizeof(struct in6_addr)); 3256 p = (u_char *)&ia; 3257 for (i = 0; i < 16; i++, p++, n -= 8) { 3258 if (n >= 8) { 3259 *p = 0xff; 3260 continue; 3261 } 3262 *p = pl2m[n]; 3263 break; 3264 } 3265 return &ia; 3266 } 3267 3268 char * 3269 allocopy(p) 3270 char *p; 3271 { 3272 char *q = (char *)malloc(strlen(p) + 1); 3273 3274 if (!q) { 3275 fatal("malloc"); 3276 /*NOTREACHED*/ 3277 } 3278 3279 strcpy(q, p); 3280 return q; 3281 } 3282 3283 char * 3284 hms() 3285 { 3286 static char buf[BUFSIZ]; 3287 time_t t; 3288 struct tm *tm; 3289 3290 t = time(NULL); 3291 if ((tm = localtime(&t)) == 0) { 3292 fatal("localtime"); 3293 /*NOTREACHED*/ 3294 } 3295 snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min, 3296 tm->tm_sec); 3297 return buf; 3298 } 3299 3300 #define RIPRANDDEV 1.0 /* 30 +- 15, max - min = 30 */ 3301 3302 int 3303 ripinterval(timer) 3304 int timer; 3305 { 3306 double r = rand(); 3307 3308 interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5)); 3309 nextalarm = time(NULL) + interval; 3310 return interval; 3311 } 3312 3313 time_t 3314 ripsuptrig() 3315 { 3316 time_t t; 3317 3318 double r = rand(); 3319 t = (int)(RIP_TRIG_INT6_MIN + 3320 (RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX)); 3321 sup_trig_update = time(NULL) + t; 3322 return t; 3323 } 3324 3325 void 3326 #ifdef __STDC__ 3327 fatal(const char *fmt, ...) 3328 #else 3329 fatal(fmt, va_alist) 3330 char *fmt; 3331 va_dcl 3332 #endif 3333 { 3334 va_list ap; 3335 char buf[1024]; 3336 3337 #ifdef __STDC__ 3338 va_start(ap, fmt); 3339 #else 3340 va_start(ap); 3341 #endif 3342 vsnprintf(buf, sizeof(buf), fmt, ap); 3343 va_end(ap); 3344 perror(buf); 3345 syslog(LOG_ERR, "%s: %s", buf, strerror(errno)); 3346 rtdexit(); 3347 } 3348 3349 void 3350 #ifdef __STDC__ 3351 tracet(int level, const char *fmt, ...) 3352 #else 3353 tracet(level, fmt, va_alist) 3354 int level; 3355 char *fmt; 3356 va_dcl 3357 #endif 3358 { 3359 va_list ap; 3360 3361 if (level <= dflag) { 3362 #ifdef __STDC__ 3363 va_start(ap, fmt); 3364 #else 3365 va_start(ap); 3366 #endif 3367 fprintf(stderr, "%s: ", hms()); 3368 vfprintf(stderr, fmt, ap); 3369 va_end(ap); 3370 } 3371 if (dflag) { 3372 #ifdef __STDC__ 3373 va_start(ap, fmt); 3374 #else 3375 va_start(ap); 3376 #endif 3377 if (level > 0) 3378 vsyslog(LOG_DEBUG, fmt, ap); 3379 else 3380 vsyslog(LOG_WARNING, fmt, ap); 3381 va_end(ap); 3382 } 3383 } 3384 3385 void 3386 #ifdef __STDC__ 3387 trace(int level, const char *fmt, ...) 3388 #else 3389 trace(level, fmt, va_alist) 3390 int level; 3391 char *fmt; 3392 va_dcl 3393 #endif 3394 { 3395 va_list ap; 3396 3397 if (level <= dflag) { 3398 #ifdef __STDC__ 3399 va_start(ap, fmt); 3400 #else 3401 va_start(ap); 3402 #endif 3403 vfprintf(stderr, fmt, ap); 3404 va_end(ap); 3405 } 3406 if (dflag) { 3407 #ifdef __STDC__ 3408 va_start(ap, fmt); 3409 #else 3410 va_start(ap); 3411 #endif 3412 if (level > 0) 3413 vsyslog(LOG_DEBUG, fmt, ap); 3414 else 3415 vsyslog(LOG_WARNING, fmt, ap); 3416 va_end(ap); 3417 } 3418 } 3419 3420 unsigned int 3421 if_maxindex() 3422 { 3423 struct if_nameindex *p, *p0; 3424 unsigned int max = 0; 3425 3426 p0 = if_nameindex(); 3427 for (p = p0; p && p->if_index && p->if_name; p++) { 3428 if (max < p->if_index) 3429 max = p->if_index; 3430 } 3431 if_freenameindex(p0); 3432 return max; 3433 } 3434 3435 struct ifc * 3436 ifc_find(name) 3437 char *name; 3438 { 3439 struct ifc *ifcp; 3440 3441 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 3442 if (strcmp(name, ifcp->ifc_name) == 0) 3443 return ifcp; 3444 } 3445 return (struct ifc *)NULL; 3446 } 3447 3448 struct iff * 3449 iff_find(ifcp, type) 3450 struct ifc *ifcp; 3451 int type; 3452 { 3453 struct iff *iffp; 3454 3455 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 3456 if (iffp->iff_type == type) 3457 return iffp; 3458 } 3459 return NULL; 3460 } 3461 3462 void 3463 setindex2ifc(idx, ifcp) 3464 int idx; 3465 struct ifc *ifcp; 3466 { 3467 int n; 3468 struct ifc **p; 3469 3470 if (!index2ifc) { 3471 nindex2ifc = 5; /*initial guess*/ 3472 index2ifc = (struct ifc **) 3473 malloc(sizeof(*index2ifc) * nindex2ifc); 3474 if (index2ifc == NULL) { 3475 fatal("malloc"); 3476 /*NOTREACHED*/ 3477 } 3478 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc); 3479 } 3480 n = nindex2ifc; 3481 while (nindex2ifc <= idx) 3482 nindex2ifc *= 2; 3483 if (n != nindex2ifc) { 3484 p = (struct ifc **)realloc(index2ifc, 3485 sizeof(*index2ifc) * nindex2ifc); 3486 if (p == NULL) { 3487 fatal("realloc"); 3488 /*NOTREACHED*/ 3489 } 3490 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n)); 3491 index2ifc = p; 3492 } 3493 index2ifc[idx] = ifcp; 3494 } 3495