route6d.c revision 1.30
1 /* $NetBSD: route6d.c,v 1.30 2001/09/24 13:22:38 wiz Exp $ */ 2 /* $KAME: route6d.c,v 1.73 2001/09/05 01:12:34 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 #ifndef lint 35 __RCSID("$NetBSD: route6d.c,v 1.30 2001/09/24 13:22:38 wiz 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 int loopifindex = 0; /* ditto */ 143 fd_set sockvec; /* vector to select() for receiving */ 144 int rtsock; /* the routing socket */ 145 int ripsock; /* socket to send/receive RIP datagram */ 146 int maxfd; /* maximum fd for select() */ 147 148 struct rip6 *ripbuf; /* packet buffer for sending */ 149 150 /* 151 * Maintain the routes in a linked list. When the number of the routes 152 * grows, somebody would like to introduce a hash based or a radix tree 153 * based structure. I believe the number of routes handled by RIP is 154 * limited and I don't have to manage a complex data structure, however. 155 * 156 * One of the major drawbacks of the linear linked list is the difficulty 157 * of representing the relationship between a couple of routes. This may 158 * be a significant problem when we have to support route aggregation with 159 * supressing the specifices covered by the aggregate. 160 */ 161 162 struct riprt { 163 struct riprt *rrt_next; /* next destination */ 164 struct riprt *rrt_same; /* same destination - future use */ 165 struct netinfo6 rrt_info; /* network info */ 166 struct in6_addr rrt_gw; /* gateway */ 167 u_long rrt_flags; /* kernel routing table flags */ 168 u_long rrt_rflags; /* route6d routing table flags */ 169 time_t rrt_t; /* when the route validated */ 170 int rrt_index; /* ifindex from which this route got */ 171 }; 172 173 struct riprt *riprt = 0; 174 175 int dflag = 0; /* debug flag */ 176 int qflag = 0; /* quiet flag */ 177 int nflag = 0; /* don't update kernel routing table */ 178 int aflag = 0; /* age out even the statically defined routes */ 179 int hflag = 0; /* don't split horizon */ 180 int lflag = 0; /* exchange site local routes */ 181 int sflag = 0; /* announce static routes w/ split horizon */ 182 int Sflag = 0; /* announce static routes to every interface */ 183 unsigned long routetag = 0; /* route tag attached on originating case */ 184 185 char *filter[MAXFILTER]; 186 int filtertype[MAXFILTER]; 187 int nfilter = 0; 188 189 pid_t pid; 190 191 struct sockaddr_storage ripsin; 192 193 struct rtentry rtentry; 194 195 int interval = 1; 196 time_t nextalarm = 0; 197 time_t sup_trig_update = 0; 198 199 FILE *rtlog = NULL; 200 201 int logopened = 0; 202 203 static u_long seq = 0; 204 205 volatile int signo; 206 volatile sig_atomic_t seenalrm; 207 volatile sig_atomic_t seenquit; 208 volatile sig_atomic_t seenusr1; 209 210 #define RRTF_AGGREGATE 0x08000000 211 #define RRTF_NOADVERTISE 0x10000000 212 #define RRTF_NH_NOT_LLADDR 0x20000000 213 #define RRTF_SENDANYWAY 0x40000000 214 #define RRTF_CHANGED 0x80000000 215 216 int main __P((int, char **)); 217 void sighandler __P((int)); 218 void ripalarm __P((void)); 219 void riprecv __P((void)); 220 void ripsend __P((struct ifc *, struct sockaddr_in6 *, int)); 221 int out_filter __P((struct riprt *, struct ifc *)); 222 void init __P((void)); 223 void sockopt __P((struct ifc *)); 224 void ifconfig __P((void)); 225 void ifconfig1 __P((const char *, const struct sockaddr *, struct ifc *, int)); 226 void rtrecv __P((void)); 227 int rt_del __P((const struct sockaddr_in6 *, const struct sockaddr_in6 *, 228 const struct sockaddr_in6 *)); 229 int rt_deladdr __P((struct ifc *, const struct sockaddr_in6 *, 230 const struct sockaddr_in6 *)); 231 void filterconfig __P((void)); 232 int getifmtu __P((int)); 233 const char *rttypes __P((struct rt_msghdr *)); 234 const char *rtflags __P((struct rt_msghdr *)); 235 const char *ifflags __P((int)); 236 int ifrt __P((struct ifc *, int)); 237 void ifrt_p2p __P((struct ifc *, int)); 238 void applymask __P((struct in6_addr *, struct in6_addr *)); 239 void applyplen __P((struct in6_addr *, int)); 240 void ifrtdump __P((int)); 241 void ifdump __P((int)); 242 void ifdump0 __P((FILE *, const struct ifc *)); 243 void rtdump __P((int)); 244 void rt_entry __P((struct rt_msghdr *, int)); 245 void rtdexit __P((void)); 246 void riprequest __P((struct ifc *, struct netinfo6 *, int, 247 struct sockaddr_in6 *)); 248 void ripflush __P((struct ifc *, struct sockaddr_in6 *)); 249 void sendrequest __P((struct ifc *)); 250 int sin6mask2len __P((const struct sockaddr_in6 *)); 251 int mask2len __P((const struct in6_addr *, int)); 252 int sendpacket __P((struct sockaddr_in6 *, int)); 253 int addroute __P((struct riprt *, const struct in6_addr *, struct ifc *)); 254 int delroute __P((struct netinfo6 *, struct in6_addr *)); 255 struct in6_addr *getroute __P((struct netinfo6 *, struct in6_addr *)); 256 void krtread __P((int)); 257 int tobeadv __P((struct riprt *, struct ifc *)); 258 char *allocopy __P((char *)); 259 char *hms __P((void)); 260 const char *inet6_n2p __P((const struct in6_addr *)); 261 struct ifac *ifa_match __P((const struct ifc *, const struct in6_addr *, int)); 262 struct in6_addr *plen2mask __P((int)); 263 struct riprt *rtsearch __P((struct netinfo6 *, struct riprt **)); 264 int ripinterval __P((int)); 265 time_t ripsuptrig __P((void)); 266 void fatal __P((const char *, ...)) 267 __attribute__((__format__(__printf__, 1, 2))); 268 void trace __P((int, const char *, ...)) 269 __attribute__((__format__(__printf__, 2, 3))); 270 void tracet __P((int, const char *, ...)) 271 __attribute__((__format__(__printf__, 2, 3))); 272 unsigned int if_maxindex __P((void)); 273 struct ifc *ifc_find __P((char *)); 274 struct iff *iff_find __P((struct ifc *, int)); 275 void setindex2ifc __P((int, struct ifc *)); 276 277 #define MALLOC(type) ((type *)malloc(sizeof(type))) 278 279 int 280 main(argc, argv) 281 int argc; 282 char **argv; 283 { 284 int ch; 285 int error = 0; 286 struct ifc *ifcp; 287 sigset_t mask, omask; 288 FILE *pidfile; 289 char *progname; 290 char *ep; 291 292 progname = strrchr(*argv, '/'); 293 if (progname) 294 progname++; 295 else 296 progname = *argv; 297 298 pid = getpid(); 299 while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) { 300 switch (ch) { 301 case 'A': 302 case 'N': 303 case 'O': 304 case 'T': 305 case 'L': 306 if (nfilter >= MAXFILTER) { 307 fatal("Exceeds MAXFILTER"); 308 /*NOTREACHED*/ 309 } 310 filtertype[nfilter] = ch; 311 filter[nfilter++] = allocopy(optarg); 312 break; 313 case 't': 314 ep = NULL; 315 routetag = strtoul(optarg, &ep, 0); 316 if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) { 317 fatal("invalid route tag"); 318 /*NOTREACHED*/ 319 } 320 break; 321 case 'R': 322 if ((rtlog = fopen(optarg, "w")) == NULL) { 323 fatal("Can not write to routelog"); 324 /*NOTREACHED*/ 325 } 326 break; 327 #define FLAG(c, flag, n) case c: do { flag = n; break; } while(0) 328 FLAG('a', aflag, 1); break; 329 FLAG('d', dflag, 1); break; 330 FLAG('D', dflag, 2); break; 331 FLAG('h', hflag, 1); break; 332 FLAG('l', lflag, 1); break; 333 FLAG('n', nflag, 1); break; 334 FLAG('q', qflag, 1); break; 335 FLAG('s', sflag, 1); break; 336 FLAG('S', Sflag, 1); break; 337 #undef FLAG 338 default: 339 fatal("Invalid option specified, terminating"); 340 /*NOTREACHED*/ 341 } 342 } 343 argc -= optind; 344 argv += optind; 345 if (argc > 0) { 346 fatal("bogus extra arguments"); 347 /*NOTREACHED*/ 348 } 349 350 if (geteuid()) { 351 nflag = 1; 352 fprintf(stderr, "No kernel update is allowed\n"); 353 } 354 openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON); 355 logopened++; 356 357 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) 358 fatal("malloc"); 359 memset(ripbuf, 0, RIP6_MAXMTU); 360 ripbuf->rip6_cmd = RIP6_RESPONSE; 361 ripbuf->rip6_vers = RIP6_VERSION; 362 ripbuf->rip6_res1[0] = 0; 363 ripbuf->rip6_res1[1] = 0; 364 365 init(); 366 ifconfig(); 367 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 368 if (ifcp->ifc_index < 0) { 369 fprintf(stderr, 370 "No ifindex found at %s (no link-local address?)\n", 371 ifcp->ifc_name); 372 error++; 373 } 374 } 375 if (error) 376 exit(1); 377 if (loopifcp == NULL) { 378 fatal("No loopback found"); 379 /*NOTREACHED*/ 380 } 381 loopifindex = loopifcp->ifc_index; 382 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 383 ifrt(ifcp, 0); 384 filterconfig(); 385 krtread(0); 386 if (dflag) 387 ifrtdump(0); 388 389 if (dflag == 0) { 390 #if 1 391 if (daemon(0, 0) < 0) { 392 fatal("daemon"); 393 /*NOTREACHED*/ 394 } 395 #else 396 if (fork()) 397 exit(0); 398 if (setsid() < 0) { 399 fatal("setid"); 400 /*NOTREACHED*/ 401 } 402 #endif 403 } 404 pid = getpid(); 405 if ((pidfile = fopen(ROUTE6D_PID, "w")) != NULL) { 406 fprintf(pidfile, "%d\n", pid); 407 fclose(pidfile); 408 } 409 410 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) { 411 fatal("malloc"); 412 /*NOTREACHED*/ 413 } 414 memset(ripbuf, 0, RIP6_MAXMTU); 415 ripbuf->rip6_cmd = RIP6_RESPONSE; 416 ripbuf->rip6_vers = RIP6_VERSION; 417 ripbuf->rip6_res1[0] = 0; 418 ripbuf->rip6_res1[1] = 0; 419 420 if (signal(SIGALRM, sighandler) == SIG_ERR || 421 signal(SIGQUIT, sighandler) == SIG_ERR || 422 signal(SIGTERM, sighandler) == SIG_ERR || 423 signal(SIGUSR1, sighandler) == SIG_ERR || 424 signal(SIGHUP, sighandler) == SIG_ERR || 425 signal(SIGINT, sighandler) == SIG_ERR) { 426 fatal("signal"); 427 /*NOTREACHED*/ 428 } 429 /* 430 * To avoid rip packet congestion (not on a cable but in this 431 * process), wait for a moment to send the first RIP6_RESPONSE 432 * packets. 433 */ 434 alarm(ripinterval(INIT_INTERVAL6)); 435 436 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 437 if (iff_find(ifcp, 'N')) 438 continue; 439 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 440 sendrequest(ifcp); 441 } 442 443 syslog(LOG_INFO, "**** Started ****"); 444 sigemptyset(&mask); 445 sigaddset(&mask, SIGALRM); 446 while (1) { 447 fd_set recvec; 448 449 if (seenalrm) { 450 ripalarm(); 451 seenalrm = 0; 452 continue; 453 } 454 if (seenquit) { 455 rtdexit(); 456 seenquit = 0; 457 continue; 458 } 459 if (seenusr1) { 460 ifrtdump(SIGUSR1); 461 seenusr1 = 0; 462 continue; 463 } 464 465 FD_COPY(&sockvec, &recvec); 466 signo = 0; 467 switch (select(maxfd + 1, &recvec, 0, 0, 0)) { 468 case -1: 469 if (errno != EINTR) { 470 fatal("select"); 471 /*NOTREACHED*/ 472 } 473 continue; 474 case 0: 475 continue; 476 default: 477 if (FD_ISSET(ripsock, &recvec)) { 478 sigprocmask(SIG_BLOCK, &mask, &omask); 479 riprecv(); 480 sigprocmask(SIG_SETMASK, &omask, NULL); 481 } 482 if (FD_ISSET(rtsock, &recvec)) { 483 sigprocmask(SIG_BLOCK, &mask, &omask); 484 rtrecv(); 485 sigprocmask(SIG_SETMASK, &omask, NULL); 486 } 487 } 488 } 489 } 490 491 void 492 sighandler(sig) 493 int sig; 494 { 495 496 signo = sig; 497 switch (signo) { 498 case SIGALRM: 499 seenalrm++; 500 break; 501 case SIGQUIT: 502 case SIGTERM: 503 seenquit++; 504 break; 505 case SIGUSR1: 506 case SIGHUP: 507 case SIGINT: 508 seenusr1++; 509 break; 510 } 511 } 512 513 /* 514 * gracefully exits after resetting sockopts. 515 */ 516 /* ARGSUSED */ 517 void 518 rtdexit() 519 { 520 struct riprt *rrt; 521 522 alarm(0); 523 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 524 if (rrt->rrt_rflags & RRTF_AGGREGATE) { 525 delroute(&rrt->rrt_info, &rrt->rrt_gw); 526 } 527 } 528 close(ripsock); 529 close(rtsock); 530 syslog(LOG_INFO, "**** Terminated ****"); 531 closelog(); 532 exit(1); 533 } 534 535 /* 536 * Called periodically: 537 * 1. age out the learned route. remove it if necessary. 538 * 2. submit RIP6_RESPONSE packets. 539 * Invoked in every SUPPLY_INTERVAL6 (30) seconds. I believe we don't have 540 * to invoke this function in every 1 or 5 or 10 seconds only to age the 541 * routes more precisely. 542 */ 543 /* ARGSUSED */ 544 void 545 ripalarm() 546 { 547 struct ifc *ifcp; 548 struct riprt *rrt, *rrt_prev, *rrt_next; 549 time_t t_lifetime, t_holddown; 550 551 /* age the RIP routes */ 552 rrt_prev = 0; 553 t_lifetime = time(NULL) - RIP_LIFETIME; 554 t_holddown = t_lifetime - RIP_HOLDDOWN; 555 for (rrt = riprt; rrt; rrt = rrt_next) { 556 rrt_next = rrt->rrt_next; 557 558 if (rrt->rrt_t == 0) { 559 rrt_prev = rrt; 560 continue; 561 } 562 if (rrt->rrt_t < t_holddown) { 563 if (rrt_prev) { 564 rrt_prev->rrt_next = rrt->rrt_next; 565 } else { 566 riprt = rrt->rrt_next; 567 } 568 delroute(&rrt->rrt_info, &rrt->rrt_gw); 569 free(rrt); 570 continue; 571 } 572 if (rrt->rrt_t < t_lifetime) 573 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 574 rrt_prev = rrt; 575 } 576 /* Supply updates */ 577 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 578 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 579 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 580 } 581 alarm(ripinterval(SUPPLY_INTERVAL6)); 582 } 583 584 void 585 init() 586 { 587 int i, int0, int255, error; 588 struct addrinfo hints, *res; 589 char port[10]; 590 591 ifc = (struct ifc *)NULL; 592 nifc = 0; 593 nindex2ifc = 0; /*initial guess*/ 594 index2ifc = NULL; 595 snprintf(port, sizeof(port), "%d", RIP6_PORT); 596 597 memset(&hints, 0, sizeof(hints)); 598 hints.ai_family = PF_INET6; 599 hints.ai_socktype = SOCK_DGRAM; 600 hints.ai_flags = AI_PASSIVE; 601 error = getaddrinfo(NULL, port, &hints, &res); 602 if (error) { 603 fatal("%s", gai_strerror(error)); 604 /*NOTREACHED*/ 605 } 606 if (res->ai_next) { 607 fatal(":: resolved to multiple address"); 608 /*NOTREACHED*/ 609 } 610 611 int0 = 0; int255 = 255; 612 ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 613 if (ripsock < 0) { 614 fatal("rip socket"); 615 /*NOTREACHED*/ 616 } 617 if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) { 618 fatal("rip bind"); 619 /*NOTREACHED*/ 620 } 621 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 622 &int255, sizeof(int255)) < 0) { 623 fatal("rip IPV6_MULTICAST_HOPS"); 624 /*NOTREACHED*/ 625 } 626 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, 627 &int0, sizeof(int0)) < 0) { 628 fatal("rip IPV6_MULTICAST_LOOP"); 629 /*NOTREACHED*/ 630 } 631 632 i = 1; 633 #ifdef IPV6_RECVPKTINFO 634 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i, 635 sizeof(i)) < 0) { 636 fatal("rip IPV6_RECVPKTINFO"); 637 /*NOTREACHED*/ 638 } 639 #else /* old adv. API */ 640 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, &i, 641 sizeof(i)) < 0) { 642 fatal("rip IPV6_PKTINFO"); 643 /*NOTREACHED*/ 644 } 645 #endif 646 647 memset(&hints, 0, sizeof(hints)); 648 hints.ai_family = PF_INET6; 649 hints.ai_socktype = SOCK_DGRAM; 650 error = getaddrinfo(RIP6_DEST, port, &hints, &res); 651 if (error) { 652 fatal("%s", gai_strerror(error)); 653 /*NOTREACHED*/ 654 } 655 if (res->ai_next) { 656 fatal("%s resolved to multiple address", RIP6_DEST); 657 /*NOTREACHED*/ 658 } 659 memcpy(&ripsin, res->ai_addr, res->ai_addrlen); 660 661 #ifdef FD_ZERO 662 FD_ZERO(&sockvec); 663 #else 664 memset(&sockvec, 0, sizeof(sockvec)); 665 #endif 666 FD_SET(ripsock, &sockvec); 667 maxfd = ripsock; 668 669 if (nflag == 0) { 670 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) { 671 fatal("route socket"); 672 /*NOTREACHED*/ 673 } 674 FD_SET(rtsock, &sockvec); 675 if (rtsock > maxfd) 676 maxfd = rtsock; 677 } else 678 rtsock = -1; /*just for safety */ 679 } 680 681 #define RIPSIZE(n) \ 682 (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6)) 683 684 /* 685 * ripflush flushes the rip datagram stored in the rip buffer 686 */ 687 static int nrt; 688 static struct netinfo6 *np; 689 690 void 691 ripflush(ifcp, sin6) 692 struct ifc *ifcp; 693 struct sockaddr_in6 *sin6; 694 { 695 int i; 696 int error; 697 698 if (ifcp) 699 tracet(1, "Send(%s): info(%d) to %s.%d\n", 700 ifcp->ifc_name, nrt, 701 inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port)); 702 else 703 tracet(1, "Send: info(%d) to %s.%d\n", 704 nrt, inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port)); 705 if (dflag >= 2) { 706 np = ripbuf->rip6_nets; 707 for (i = 0; i < nrt; i++, np++) { 708 if (np->rip6_metric == NEXTHOP_METRIC) { 709 if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) 710 trace(2, " NextHop reset"); 711 else { 712 trace(2, " NextHop %s", 713 inet6_n2p(&np->rip6_dest)); 714 } 715 } else { 716 trace(2, " %s/%d[%d]", 717 inet6_n2p(&np->rip6_dest), 718 np->rip6_plen, np->rip6_metric); 719 } 720 if (np->rip6_tag) { 721 trace(2, " tag=0x%04x", 722 ntohs(np->rip6_tag) & 0xffff); 723 } 724 trace(2, "\n"); 725 } 726 } 727 error = sendpacket(sin6, RIPSIZE(nrt)); 728 if (error == EAFNOSUPPORT) { 729 /* Protocol not supported */ 730 tracet(1, "Could not send info to %s (%s): " 731 "set IFF_UP to 0\n", 732 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 733 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 734 } 735 nrt = 0; np = ripbuf->rip6_nets; 736 } 737 738 /* 739 * Generate RIP6_RESPONSE packets and send them. 740 */ 741 void 742 ripsend(ifcp, sin6, flag) 743 struct ifc *ifcp; 744 struct sockaddr_in6 *sin6; 745 int flag; 746 { 747 struct riprt *rrt; 748 struct in6_addr *nh; /* next hop */ 749 int maxrte; 750 751 if (ifcp == NULL) { 752 /* 753 * Request from non-link local address is not 754 * a regular route6d update. 755 */ 756 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) - 757 sizeof(struct udphdr) - 758 sizeof(struct rip6) + sizeof(struct netinfo6)) / 759 sizeof(struct netinfo6); 760 nrt = 0; np = ripbuf->rip6_nets; nh = NULL; 761 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 762 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 763 continue; 764 /* Put the route to the buffer */ 765 *np = rrt->rrt_info; 766 np++; nrt++; 767 if (nrt == maxrte) { 768 ripflush(NULL, sin6); 769 nh = NULL; 770 } 771 } 772 if (nrt) /* Send last packet */ 773 ripflush(NULL, sin6); 774 return; 775 } 776 777 if ((flag & RRTF_SENDANYWAY) == 0 && 778 (qflag || (ifcp->ifc_flags & IFF_LOOPBACK))) 779 return; 780 781 /* -N: no use */ 782 if (iff_find(ifcp, 'N') != NULL) 783 return; 784 785 /* -T: generate default route only */ 786 if (iff_find(ifcp, 'T') != NULL) { 787 struct netinfo6 rrt_info; 788 memset(&rrt_info, 0, sizeof(struct netinfo6)); 789 rrt_info.rip6_dest = in6addr_any; 790 rrt_info.rip6_plen = 0; 791 rrt_info.rip6_metric = 1; 792 rrt_info.rip6_metric += ifcp->ifc_metric; 793 rrt_info.rip6_tag = htons(routetag & 0xffff); 794 np = ripbuf->rip6_nets; 795 *np = rrt_info; 796 nrt = 1; 797 ripflush(ifcp, sin6); 798 return; 799 } 800 801 maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) - 802 sizeof(struct udphdr) - 803 sizeof(struct rip6) + sizeof(struct netinfo6)) / 804 sizeof(struct netinfo6); 805 806 nrt = 0; np = ripbuf->rip6_nets; nh = NULL; 807 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 808 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 809 continue; 810 811 /* Need to check filter here */ 812 if (out_filter(rrt, ifcp) == 0) 813 continue; 814 815 /* Check split horizon and other conditions */ 816 if (tobeadv(rrt, ifcp) == 0) 817 continue; 818 819 /* Only considers the routes with flag if specified */ 820 if ((flag & RRTF_CHANGED) && 821 (rrt->rrt_rflags & RRTF_CHANGED) == 0) 822 continue; 823 824 /* Check nexthop */ 825 if (rrt->rrt_index == ifcp->ifc_index && 826 !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) && 827 (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) { 828 if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) { 829 if (nrt == maxrte - 2) 830 ripflush(ifcp, sin6); 831 np->rip6_dest = rrt->rrt_gw; 832 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) 833 SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0); 834 np->rip6_plen = 0; 835 np->rip6_tag = 0; 836 np->rip6_metric = NEXTHOP_METRIC; 837 nh = &rrt->rrt_gw; 838 np++; nrt++; 839 } 840 } else if (nh && (rrt->rrt_index != ifcp->ifc_index || 841 !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) || 842 rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) { 843 /* Reset nexthop */ 844 if (nrt == maxrte - 2) 845 ripflush(ifcp, sin6); 846 memset(np, 0, sizeof(struct netinfo6)); 847 np->rip6_metric = NEXTHOP_METRIC; 848 nh = NULL; 849 np++; nrt++; 850 } 851 852 /* Put the route to the buffer */ 853 *np = rrt->rrt_info; 854 np++; nrt++; 855 if (nrt == maxrte) { 856 ripflush(ifcp, sin6); 857 nh = NULL; 858 } 859 } 860 if (nrt) /* Send last packet */ 861 ripflush(ifcp, sin6); 862 } 863 864 /* 865 * outbound filter logic, per-route/interface. 866 */ 867 int 868 out_filter(rrt, ifcp) 869 struct riprt *rrt; 870 struct ifc *ifcp; 871 { 872 struct iff *iffp; 873 struct in6_addr ia; 874 int ok; 875 876 /* 877 * -A: filter out less specific routes, if we have aggregated 878 * route configured. 879 */ 880 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 881 if (iffp->iff_type != 'A') 882 continue; 883 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen) 884 continue; 885 ia = rrt->rrt_info.rip6_dest; 886 applyplen(&ia, iffp->iff_plen); 887 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) 888 return 0; 889 } 890 891 /* 892 * if it is an aggregated route, advertise it only to the 893 * interfaces specified on -A. 894 */ 895 if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) { 896 ok = 0; 897 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 898 if (iffp->iff_type != 'A') 899 continue; 900 if (rrt->rrt_info.rip6_plen == iffp->iff_plen && 901 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 902 &iffp->iff_addr)) { 903 ok = 1; 904 break; 905 } 906 } 907 if (!ok) 908 return 0; 909 } 910 911 /* 912 * -O: advertise only if prefix matches the configured prefix. 913 */ 914 if (iff_find(ifcp, 'O')) { 915 ok = 0; 916 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 917 if (iffp->iff_type != 'O') 918 continue; 919 if (rrt->rrt_info.rip6_plen < iffp->iff_plen) 920 continue; 921 ia = rrt->rrt_info.rip6_dest; 922 applyplen(&ia, iffp->iff_plen); 923 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 924 ok = 1; 925 break; 926 } 927 } 928 if (!ok) 929 return 0; 930 } 931 932 /* the prefix should be advertised */ 933 return 1; 934 } 935 936 /* 937 * Determine if the route is to be advertised on the specified interface. 938 * It checks options specified in the arguments and the split horizon rule. 939 */ 940 int 941 tobeadv(rrt, ifcp) 942 struct riprt *rrt; 943 struct ifc *ifcp; 944 { 945 946 /* Special care for static routes */ 947 if (rrt->rrt_flags & RTF_STATIC) { 948 /* XXX don't advertise reject/blackhole routes */ 949 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE)) 950 return 0; 951 952 if (Sflag) /* Yes, advertise it anyway */ 953 return 1; 954 if (sflag && rrt->rrt_index != ifcp->ifc_index) 955 return 1; 956 return 0; 957 } 958 /* Regular split horizon */ 959 if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index) 960 return 0; 961 return 1; 962 } 963 964 /* 965 * Send a rip packet actually. 966 */ 967 int 968 sendpacket(sin6, len) 969 struct sockaddr_in6 *sin6; 970 int len; 971 { 972 /* 973 * MSG_DONTROUTE should not be specified when it responds with a 974 * RIP6_REQUEST message. SO_DONTROUTE has been specified to 975 * other sockets. 976 */ 977 struct msghdr m; 978 struct cmsghdr *cm; 979 struct iovec iov[2]; 980 u_char cmsgbuf[256]; 981 struct in6_pktinfo *pi; 982 int idx; 983 struct sockaddr_in6 sincopy; 984 985 /* do not overwrite the given sin */ 986 sincopy = *sin6; 987 sin6 = &sincopy; 988 989 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) 990 || IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 991 idx = IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr); 992 SET_IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr, 0); 993 } else 994 idx = 0; 995 996 m.msg_name = (caddr_t)sin6; 997 m.msg_namelen = sizeof(*sin6); 998 iov[0].iov_base = (caddr_t)ripbuf; 999 iov[0].iov_len = len; 1000 m.msg_iov = iov; 1001 m.msg_iovlen = 1; 1002 if (!idx) { 1003 m.msg_control = NULL; 1004 m.msg_controllen = 0; 1005 } else { 1006 memset(cmsgbuf, 0, sizeof(cmsgbuf)); 1007 cm = (struct cmsghdr *)cmsgbuf; 1008 m.msg_control = (caddr_t)cm; 1009 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); 1010 1011 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 1012 cm->cmsg_level = IPPROTO_IPV6; 1013 cm->cmsg_type = IPV6_PKTINFO; 1014 pi = (struct in6_pktinfo *)CMSG_DATA(cm); 1015 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/ 1016 pi->ipi6_ifindex = idx; 1017 } 1018 1019 if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) { 1020 trace(1, "sendmsg: %s\n", strerror(errno)); 1021 return errno; 1022 } 1023 1024 return 0; 1025 } 1026 1027 /* 1028 * Receive and process RIP packets. Update the routes/kernel forwarding 1029 * table if necessary. 1030 */ 1031 void 1032 riprecv() 1033 { 1034 struct ifc *ifcp, *ic; 1035 struct sockaddr_in6 fsock; 1036 struct in6_addr nh; /* next hop */ 1037 struct rip6 *rp; 1038 struct netinfo6 *np, *nq; 1039 struct riprt *rrt; 1040 int len, nn, need_trigger, idx; 1041 char buf[4 * RIP6_MAXMTU]; 1042 time_t t; 1043 struct msghdr m; 1044 struct cmsghdr *cm; 1045 struct iovec iov[2]; 1046 u_char cmsgbuf[256]; 1047 struct in6_pktinfo *pi; 1048 struct iff *iffp; 1049 struct in6_addr ia; 1050 int ok; 1051 time_t t_half_lifetime; 1052 1053 need_trigger = 0; 1054 1055 m.msg_name = (caddr_t)&fsock; 1056 m.msg_namelen = sizeof(fsock); 1057 iov[0].iov_base = (caddr_t)buf; 1058 iov[0].iov_len = sizeof(buf); 1059 m.msg_iov = iov; 1060 m.msg_iovlen = 1; 1061 cm = (struct cmsghdr *)cmsgbuf; 1062 m.msg_control = (caddr_t)cm; 1063 m.msg_controllen = sizeof(cmsgbuf); 1064 if ((len = recvmsg(ripsock, &m, 0)) < 0) { 1065 fatal("recvmsg"); 1066 /*NOTREACHED*/ 1067 } 1068 idx = 0; 1069 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m); 1070 cm; 1071 cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) { 1072 if (cm->cmsg_level == IPPROTO_IPV6 && 1073 cm->cmsg_type == IPV6_PKTINFO) { 1074 pi = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1075 idx = pi->ipi6_ifindex; 1076 break; 1077 } 1078 } 1079 if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) 1080 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx); 1081 1082 nh = fsock.sin6_addr; 1083 nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) / 1084 sizeof(struct netinfo6); 1085 rp = (struct rip6 *)buf; 1086 np = rp->rip6_nets; 1087 1088 if (rp->rip6_vers != RIP6_VERSION) { 1089 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers); 1090 return; 1091 } 1092 if (rp->rip6_cmd == RIP6_REQUEST) { 1093 if (idx && idx < nindex2ifc) { 1094 ifcp = index2ifc[idx]; 1095 riprequest(ifcp, np, nn, &fsock); 1096 } else { 1097 riprequest(NULL, np, nn, &fsock); 1098 } 1099 return; 1100 } 1101 1102 if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) { 1103 trace(1, "Packets from non-ll addr: %s\n", 1104 inet6_n2p(&fsock.sin6_addr)); 1105 return; /* Ignore packets from non-link-local addr */ 1106 } 1107 idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr); 1108 ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL; 1109 if (!ifcp) { 1110 trace(1, "Packets to unknown interface index %d\n", idx); 1111 return; /* Ignore it */ 1112 } 1113 if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr)) 1114 return; /* The packet is from me; ignore */ 1115 if (rp->rip6_cmd != RIP6_RESPONSE) { 1116 trace(1, "Invalid command %d\n", rp->rip6_cmd); 1117 return; 1118 } 1119 1120 /* -N: no use */ 1121 if (iff_find(ifcp, 'N') != NULL) 1122 return; 1123 1124 tracet(1, "Recv(%s): from %s.%d info(%d)\n", 1125 ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn); 1126 1127 t = time(NULL); 1128 t_half_lifetime = t - (RIP_LIFETIME/2); 1129 for (; nn; nn--, np++) { 1130 if (np->rip6_metric == NEXTHOP_METRIC) { 1131 /* modify neighbor address */ 1132 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1133 nh = np->rip6_dest; 1134 SET_IN6_LINKLOCAL_IFINDEX(nh, idx); 1135 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1136 } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) { 1137 nh = fsock.sin6_addr; 1138 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1139 } else { 1140 nh = fsock.sin6_addr; 1141 trace(1, "\tInvalid Nexthop: %s\n", 1142 inet6_n2p(&np->rip6_dest)); 1143 } 1144 continue; 1145 } 1146 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) { 1147 trace(1, "\tMulticast netinfo6: %s/%d [%d]\n", 1148 inet6_n2p(&np->rip6_dest), 1149 np->rip6_plen, np->rip6_metric); 1150 continue; 1151 } 1152 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) { 1153 trace(1, "\tLoopback netinfo6: %s/%d [%d]\n", 1154 inet6_n2p(&np->rip6_dest), 1155 np->rip6_plen, np->rip6_metric); 1156 continue; 1157 } 1158 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1159 trace(1, "\tLink Local netinfo6: %s/%d [%d]\n", 1160 inet6_n2p(&np->rip6_dest), 1161 np->rip6_plen, np->rip6_metric); 1162 continue; 1163 } 1164 /* may need to pass sitelocal prefix in some case, however*/ 1165 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) { 1166 trace(1, "\tSite Local netinfo6: %s/%d [%d]\n", 1167 inet6_n2p(&np->rip6_dest), 1168 np->rip6_plen, np->rip6_metric); 1169 continue; 1170 } 1171 trace(2, "\tnetinfo6: %s/%d [%d]", 1172 inet6_n2p(&np->rip6_dest), 1173 np->rip6_plen, np->rip6_metric); 1174 if (np->rip6_tag) 1175 trace(2, " tag=0x%04x", ntohs(np->rip6_tag) & 0xffff); 1176 if (dflag >= 2) { 1177 ia = np->rip6_dest; 1178 applyplen(&ia, np->rip6_plen); 1179 if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest)) 1180 trace(2, " [junk outside prefix]"); 1181 } 1182 1183 /* 1184 * -L: listen only if the prefix matches the configuration 1185 */ 1186 ok = 1; /* if there's no L filter, it is ok */ 1187 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 1188 if (iffp->iff_type != 'L') 1189 continue; 1190 ok = 0; 1191 if (np->rip6_plen < iffp->iff_plen) 1192 continue; 1193 /* special rule: ::/0 means default, not "in /0" */ 1194 if (iffp->iff_plen == 0 && np->rip6_plen > 0) 1195 continue; 1196 ia = np->rip6_dest; 1197 applyplen(&ia, iffp->iff_plen); 1198 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 1199 ok = 1; 1200 break; 1201 } 1202 } 1203 if (!ok) { 1204 trace(2, " (filtered)\n"); 1205 continue; 1206 } 1207 1208 trace(2, "\n"); 1209 np->rip6_metric++; 1210 np->rip6_metric += ifcp->ifc_metric; 1211 if (np->rip6_metric > HOPCNT_INFINITY6) 1212 np->rip6_metric = HOPCNT_INFINITY6; 1213 1214 applyplen(&np->rip6_dest, np->rip6_plen); 1215 if ((rrt = rtsearch(np, NULL)) != NULL) { 1216 if (rrt->rrt_t == 0) 1217 continue; /* Intf route has priority */ 1218 nq = &rrt->rrt_info; 1219 if (nq->rip6_metric > np->rip6_metric) { 1220 if (rrt->rrt_index == ifcp->ifc_index && 1221 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1222 /* Small metric from the same gateway */ 1223 nq->rip6_metric = np->rip6_metric; 1224 } else { 1225 /* Better route found */ 1226 rrt->rrt_index = ifcp->ifc_index; 1227 /* Update routing table */ 1228 delroute(nq, &rrt->rrt_gw); 1229 rrt->rrt_gw = nh; 1230 *nq = *np; 1231 addroute(rrt, &nh, ifcp); 1232 } 1233 rrt->rrt_rflags |= RRTF_CHANGED; 1234 rrt->rrt_t = t; 1235 need_trigger = 1; 1236 } else if (nq->rip6_metric < np->rip6_metric && 1237 rrt->rrt_index == ifcp->ifc_index && 1238 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1239 /* Got worse route from same gw */ 1240 nq->rip6_metric = np->rip6_metric; 1241 rrt->rrt_t = t; 1242 rrt->rrt_rflags |= RRTF_CHANGED; 1243 need_trigger = 1; 1244 } else if (nq->rip6_metric == np->rip6_metric && 1245 np->rip6_metric < HOPCNT_INFINITY6) { 1246 if (rrt->rrt_index == ifcp->ifc_index && 1247 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1248 /* same metric, same route from same gw */ 1249 rrt->rrt_t = t; 1250 } else if (rrt->rrt_t < t_half_lifetime) { 1251 /* Better route found */ 1252 rrt->rrt_index = ifcp->ifc_index; 1253 /* Update routing table */ 1254 delroute(nq, &rrt->rrt_gw); 1255 rrt->rrt_gw = nh; 1256 *nq = *np; 1257 addroute(rrt, &nh, ifcp); 1258 rrt->rrt_rflags |= RRTF_CHANGED; 1259 rrt->rrt_t = t; 1260 } 1261 } 1262 /* 1263 * if nq->rip6_metric == HOPCNT_INFINITY6 then 1264 * do not update age value. Do nothing. 1265 */ 1266 } else if (np->rip6_metric < HOPCNT_INFINITY6) { 1267 /* Got a new valid route */ 1268 if ((rrt = MALLOC(struct riprt)) == NULL) { 1269 fatal("malloc: struct riprt"); 1270 /*NOTREACHED*/ 1271 } 1272 memset(rrt, 0, sizeof(*rrt)); 1273 nq = &rrt->rrt_info; 1274 1275 rrt->rrt_same = NULL; 1276 rrt->rrt_index = ifcp->ifc_index; 1277 rrt->rrt_flags = RTF_UP|RTF_GATEWAY; 1278 rrt->rrt_gw = nh; 1279 *nq = *np; 1280 applyplen(&nq->rip6_dest, nq->rip6_plen); 1281 if (nq->rip6_plen == sizeof(struct in6_addr) * 8) 1282 rrt->rrt_flags |= RTF_HOST; 1283 1284 /* Put the route to the list */ 1285 rrt->rrt_next = riprt; 1286 riprt = rrt; 1287 /* Update routing table */ 1288 addroute(rrt, &nh, ifcp); 1289 rrt->rrt_rflags |= RRTF_CHANGED; 1290 need_trigger = 1; 1291 rrt->rrt_t = t; 1292 } 1293 } 1294 /* XXX need to care the interval between triggered updates */ 1295 if (need_trigger) { 1296 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) { 1297 for (ic = ifc; ic; ic = ic->ifc_next) { 1298 if (ifcp->ifc_index == ic->ifc_index) 1299 continue; 1300 if (ic->ifc_flags & IFF_UP) 1301 ripsend(ic, &ic->ifc_ripsin, 1302 RRTF_CHANGED); 1303 } 1304 } 1305 /* Reset the flag */ 1306 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1307 rrt->rrt_rflags &= ~RRTF_CHANGED; 1308 } 1309 } 1310 1311 /* 1312 * Send all routes request packet to the specified interface. 1313 */ 1314 void 1315 sendrequest(ifcp) 1316 struct ifc *ifcp; 1317 { 1318 struct netinfo6 *np; 1319 int error; 1320 1321 if (ifcp->ifc_flags & IFF_LOOPBACK) 1322 return; 1323 ripbuf->rip6_cmd = RIP6_REQUEST; 1324 np = ripbuf->rip6_nets; 1325 memset(np, 0, sizeof(struct netinfo6)); 1326 np->rip6_metric = HOPCNT_INFINITY6; 1327 tracet(1, "Send rtdump Request to %s (%s)\n", 1328 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1329 error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1)); 1330 if (error == EAFNOSUPPORT) { 1331 /* Protocol not supported */ 1332 tracet(1, "Could not send rtdump Request to %s (%s): " 1333 "set IFF_UP to 0\n", 1334 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1335 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 1336 } 1337 ripbuf->rip6_cmd = RIP6_RESPONSE; 1338 } 1339 1340 /* 1341 * Process a RIP6_REQUEST packet. 1342 */ 1343 void 1344 riprequest(ifcp, np, nn, sin6) 1345 struct ifc *ifcp; 1346 struct netinfo6 *np; 1347 int nn; 1348 struct sockaddr_in6 *sin6; 1349 { 1350 int i; 1351 struct riprt *rrt; 1352 1353 if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) && 1354 np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) { 1355 /* Specific response, don't split-horizon */ 1356 trace(1, "\tRIP Request\n"); 1357 for (i = 0; i < nn; i++, np++) { 1358 rrt = rtsearch(np, NULL); 1359 if (rrt) 1360 np->rip6_metric = rrt->rrt_info.rip6_metric; 1361 else 1362 np->rip6_metric = HOPCNT_INFINITY6; 1363 } 1364 (void)sendpacket(sin6, RIPSIZE(nn)); 1365 return; 1366 } 1367 /* Whole routing table dump */ 1368 trace(1, "\tRIP Request -- whole routing table\n"); 1369 ripsend(ifcp, sin6, RRTF_SENDANYWAY); 1370 } 1371 1372 /* 1373 * Get information of each interface. 1374 */ 1375 void 1376 ifconfig() 1377 { 1378 struct ifaddrs *ifap, *ifa; 1379 struct ifc *ifcp; 1380 struct ipv6_mreq mreq; 1381 int s; 1382 1383 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 1384 fatal("socket"); 1385 /*NOTREACHED*/ 1386 } 1387 1388 if (getifaddrs(&ifap) != 0) { 1389 fatal("getifaddrs"); 1390 /*NOTREACHED*/ 1391 } 1392 1393 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 1394 if (ifa->ifa_addr->sa_family != AF_INET6) 1395 continue; 1396 ifcp = ifc_find(ifa->ifa_name); 1397 /* we are interested in multicast-capable interfaces */ 1398 if ((ifa->ifa_flags & IFF_MULTICAST) == 0) 1399 continue; 1400 if (!ifcp) { 1401 /* new interface */ 1402 if ((ifcp = MALLOC(struct ifc)) == NULL) { 1403 fatal("malloc: struct ifc"); 1404 /*NOTREACHED*/ 1405 } 1406 memset(ifcp, 0, sizeof(*ifcp)); 1407 ifcp->ifc_index = -1; 1408 ifcp->ifc_next = ifc; 1409 ifc = ifcp; 1410 nifc++; 1411 ifcp->ifc_name = allocopy(ifa->ifa_name); 1412 ifcp->ifc_addr = 0; 1413 ifcp->ifc_filter = 0; 1414 ifcp->ifc_flags = ifa->ifa_flags; 1415 trace(1, "newif %s <%s>\n", ifcp->ifc_name, 1416 ifflags(ifcp->ifc_flags)); 1417 if (!strcmp(ifcp->ifc_name, LOOPBACK_IF)) 1418 loopifcp = ifcp; 1419 } else { 1420 /* update flag, this may be up again */ 1421 if (ifcp->ifc_flags != ifa->ifa_flags) { 1422 trace(1, "%s: <%s> -> ", ifcp->ifc_name, 1423 ifflags(ifcp->ifc_flags)); 1424 trace(1, "<%s>\n", ifflags(ifa->ifa_flags)); 1425 ifcp->ifc_cflags |= IFC_CHANGED; 1426 } 1427 ifcp->ifc_flags = ifa->ifa_flags; 1428 } 1429 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s); 1430 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP 1431 && 0 < ifcp->ifc_index && !ifcp->ifc_joined) { 1432 mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr; 1433 mreq.ipv6mr_interface = ifcp->ifc_index; 1434 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP, 1435 &mreq, sizeof(mreq)) < 0) { 1436 fatal("IPV6_JOIN_GROUP"); 1437 /*NOTREACHED*/ 1438 } 1439 trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST); 1440 ifcp->ifc_joined++; 1441 } 1442 } 1443 close(s); 1444 freeifaddrs(ifap); 1445 } 1446 1447 void 1448 ifconfig1(name, sa, ifcp, s) 1449 const char *name; 1450 const struct sockaddr *sa; 1451 struct ifc *ifcp; 1452 int s; 1453 { 1454 struct in6_ifreq ifr; 1455 const struct sockaddr_in6 *sin6; 1456 struct ifac *ifa; 1457 int plen; 1458 char buf[BUFSIZ]; 1459 1460 sin6 = (const struct sockaddr_in6 *)sa; 1461 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) && !lflag) 1462 return; 1463 ifr.ifr_addr = *sin6; 1464 strcpy(ifr.ifr_name, name); 1465 if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) { 1466 fatal("ioctl: SIOCGIFNETMASK_IN6"); 1467 /*NOTREACHED*/ 1468 } 1469 plen = sin6mask2len(&ifr.ifr_addr); 1470 if ((ifa = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) { 1471 /* same interface found */ 1472 /* need check if something changed */ 1473 /* XXX not yet implemented */ 1474 return; 1475 } 1476 /* 1477 * New address is found 1478 */ 1479 if ((ifa = MALLOC(struct ifac)) == NULL) { 1480 fatal("malloc: struct ifac"); 1481 /*NOTREACHED*/ 1482 } 1483 memset(ifa, 0, sizeof(*ifa)); 1484 ifa->ifa_conf = ifcp; 1485 ifa->ifa_next = ifcp->ifc_addr; 1486 ifcp->ifc_addr = ifa; 1487 ifa->ifa_addr = sin6->sin6_addr; 1488 ifa->ifa_plen = plen; 1489 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1490 ifr.ifr_addr = *sin6; 1491 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) { 1492 fatal("ioctl: SIOCGIFDSTADDR_IN6"); 1493 /*NOTREACHED*/ 1494 } 1495 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr; 1496 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf)); 1497 trace(1, "found address %s/%d -- %s\n", 1498 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf); 1499 } else { 1500 trace(1, "found address %s/%d\n", 1501 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen); 1502 } 1503 if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 1504 ifcp->ifc_mylladdr = ifa->ifa_addr; 1505 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr); 1506 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len); 1507 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr, 1508 ifcp->ifc_index); 1509 setindex2ifc(ifcp->ifc_index, ifcp); 1510 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index); 1511 if (ifcp->ifc_mtu > RIP6_MAXMTU) 1512 ifcp->ifc_mtu = RIP6_MAXMTU; 1513 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) { 1514 fatal("ioctl: SIOCGIFMETRIC"); 1515 /*NOTREACHED*/ 1516 } 1517 ifcp->ifc_metric = ifr.ifr_metric; 1518 trace(1, "\tindex: %d, mtu: %d, metric: %d\n", 1519 ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric); 1520 } else 1521 ifcp->ifc_cflags |= IFC_CHANGED; 1522 } 1523 1524 /* 1525 * Receive and process routing messages. 1526 * Update interface information as necesssary. 1527 */ 1528 void 1529 rtrecv() 1530 { 1531 char buf[BUFSIZ]; 1532 char *p, *q; 1533 struct rt_msghdr *rtm; 1534 struct ifa_msghdr *ifam; 1535 struct if_msghdr *ifm; 1536 int len; 1537 struct ifc *ifcp, *ic; 1538 int iface = 0, rtable = 0; 1539 struct sockaddr_in6 *rta[RTAX_MAX]; 1540 struct sockaddr_in6 mask; 1541 int i, addrs; 1542 struct riprt *rrt; 1543 1544 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 1545 perror("read from rtsock"); 1546 exit(1); 1547 } 1548 if (len < sizeof(*rtm)) { 1549 trace(1, "short read from rtsock: %d (should be > %lu)\n", 1550 len, (u_long)sizeof(*rtm)); 1551 return; 1552 } 1553 if (dflag >= 2) { 1554 fprintf(stderr, "rtmsg:\n"); 1555 for (i = 0; i < len; i++) { 1556 fprintf(stderr, "%02x ", buf[i] & 0xff); 1557 if (i % 16 == 15) fprintf(stderr, "\n"); 1558 } 1559 fprintf(stderr, "\n"); 1560 } 1561 1562 for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) { 1563 /* safety against bogus message */ 1564 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) { 1565 trace(1, "bogus rtmsg: length=%d\n", 1566 ((struct rt_msghdr *)p)->rtm_msglen); 1567 break; 1568 } 1569 rtm = NULL; 1570 ifam = NULL; 1571 ifm = NULL; 1572 switch (((struct rt_msghdr *)p)->rtm_type) { 1573 case RTM_NEWADDR: 1574 case RTM_DELADDR: 1575 ifam = (struct ifa_msghdr *)p; 1576 addrs = ifam->ifam_addrs; 1577 q = (char *)(ifam + 1); 1578 break; 1579 case RTM_IFINFO: 1580 ifm = (struct if_msghdr *)p; 1581 addrs = ifm->ifm_addrs; 1582 q = (char *)(ifm + 1); 1583 break; 1584 default: 1585 rtm = (struct rt_msghdr *)p; 1586 addrs = rtm->rtm_addrs; 1587 q = (char *)(rtm + 1); 1588 if (rtm->rtm_version != RTM_VERSION) { 1589 trace(1, "unexpected rtmsg version %d " 1590 "(should be %d)\n", 1591 rtm->rtm_version, RTM_VERSION); 1592 continue; 1593 } 1594 if (rtm->rtm_pid == pid) { 1595 #if 0 1596 trace(1, "rtmsg looped back to me, ignored\n"); 1597 #endif 1598 continue; 1599 } 1600 break; 1601 } 1602 memset(&rta, 0, sizeof(rta)); 1603 for (i = 0; i < RTAX_MAX; i++) { 1604 if (addrs & (1 << i)) { 1605 rta[i] = (struct sockaddr_in6 *)q; 1606 q += ROUNDUP(rta[i]->sin6_len); 1607 } 1608 } 1609 1610 trace(1, "rtsock: %s (addrs=%x)\n", 1611 rttypes((struct rt_msghdr *)p), addrs); 1612 if (dflag >= 2) { 1613 for (i = 0; 1614 i < ((struct rt_msghdr *)p)->rtm_msglen; 1615 i++) { 1616 fprintf(stderr, "%02x ", p[i] & 0xff); 1617 if (i % 16 == 15) fprintf(stderr, "\n"); 1618 } 1619 fprintf(stderr, "\n"); 1620 } 1621 1622 /* 1623 * Easy ones first. 1624 * 1625 * We may be able to optimize by using ifm->ifm_index or 1626 * ifam->ifam_index. For simplicity we don't do that here. 1627 */ 1628 switch (((struct rt_msghdr *)p)->rtm_type) { 1629 case RTM_NEWADDR: 1630 case RTM_IFINFO: 1631 iface++; 1632 continue; 1633 case RTM_ADD: 1634 rtable++; 1635 continue; 1636 case RTM_LOSING: 1637 case RTM_MISS: 1638 case RTM_RESOLVE: 1639 case RTM_GET: 1640 case RTM_LOCK: 1641 /* nothing to be done here */ 1642 trace(1, "\tnothing to be done, ignored\n"); 1643 continue; 1644 } 1645 1646 #if 0 1647 if (rta[RTAX_DST] == NULL) { 1648 trace(1, "\tno destination, ignored\n"); 1649 continue; 1650 } 1651 if (rta[RTAX_DST]->sin6_family != AF_INET6) { 1652 trace(1, "\taf mismatch, ignored\n"); 1653 continue; 1654 } 1655 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) { 1656 trace(1, "\tlinklocal destination, ignored\n"); 1657 continue; 1658 } 1659 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) { 1660 trace(1, "\tloopback destination, ignored\n"); 1661 continue; /* Loopback */ 1662 } 1663 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) { 1664 trace(1, "\tmulticast destination, ignored\n"); 1665 continue; 1666 } 1667 #endif 1668 1669 /* hard ones */ 1670 switch (((struct rt_msghdr *)p)->rtm_type) { 1671 case RTM_NEWADDR: 1672 case RTM_IFINFO: 1673 case RTM_ADD: 1674 case RTM_LOSING: 1675 case RTM_MISS: 1676 case RTM_RESOLVE: 1677 case RTM_GET: 1678 case RTM_LOCK: 1679 /* should already be handled */ 1680 fatal("rtrecv: never reach here"); 1681 /*NOTREACHED*/ 1682 case RTM_DELETE: 1683 if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) { 1684 trace(1, "\tsome of dst/gw/netamsk are " 1685 "unavailable, ignored\n"); 1686 break; 1687 } 1688 if ((rtm->rtm_flags & RTF_HOST) != 0) { 1689 mask.sin6_len = sizeof(mask); 1690 memset(&mask.sin6_addr, 0xff, 1691 sizeof(mask.sin6_addr)); 1692 rta[RTAX_NETMASK] = &mask; 1693 } else if (!rta[RTAX_NETMASK]) { 1694 trace(1, "\tsome of dst/gw/netamsk are " 1695 "unavailable, ignored\n"); 1696 break; 1697 } 1698 if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY], 1699 rta[RTAX_NETMASK]) == 0) { 1700 rtable++; /*just to be sure*/ 1701 } 1702 break; 1703 case RTM_CHANGE: 1704 case RTM_REDIRECT: 1705 trace(1, "\tnot supported yet, ignored\n"); 1706 break; 1707 case RTM_DELADDR: 1708 if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) { 1709 trace(1, "\tno netmask or ifa given, ignored\n"); 1710 break; 1711 } 1712 if (ifam->ifam_index < nindex2ifc) 1713 ifcp = index2ifc[ifam->ifam_index]; 1714 else 1715 ifcp = NULL; 1716 if (!ifcp) { 1717 trace(1, "\tinvalid ifam_index %d, ignored\n", 1718 ifam->ifam_index); 1719 break; 1720 } 1721 if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK])) 1722 iface++; 1723 break; 1724 case RTM_OLDADD: 1725 case RTM_OLDDEL: 1726 trace(1, "\tnot supported yet, ignored\n"); 1727 break; 1728 } 1729 1730 } 1731 1732 if (iface) { 1733 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n"); 1734 ifconfig(); 1735 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 1736 if (ifcp->ifc_cflags & IFC_CHANGED) { 1737 if (ifrt(ifcp, 1)) { 1738 for (ic = ifc; ic; ic = ic->ifc_next) { 1739 if (ifcp->ifc_index == ic->ifc_index) 1740 continue; 1741 if (ic->ifc_flags & IFF_UP) 1742 ripsend(ic, &ic->ifc_ripsin, 1743 RRTF_CHANGED); 1744 } 1745 /* Reset the flag */ 1746 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1747 rrt->rrt_rflags &= ~RRTF_CHANGED; 1748 } 1749 ifcp->ifc_cflags &= ~IFC_CHANGED; 1750 } 1751 } 1752 if (rtable) { 1753 trace(1, "rtsock: read routing table again\n"); 1754 krtread(1); 1755 } 1756 } 1757 1758 /* 1759 * remove specified route from the internal routing table. 1760 */ 1761 int 1762 rt_del(sdst, sgw, smask) 1763 const struct sockaddr_in6 *sdst; 1764 const struct sockaddr_in6 *sgw; 1765 const struct sockaddr_in6 *smask; 1766 { 1767 const struct in6_addr *dst = NULL; 1768 const struct in6_addr *gw = NULL; 1769 int prefix; 1770 struct netinfo6 ni6; 1771 struct riprt *rrt = NULL; 1772 time_t t_lifetime; 1773 1774 if (sdst->sin6_family != AF_INET6) { 1775 trace(1, "\tother AF, ignored\n"); 1776 return -1; 1777 } 1778 if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr) 1779 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback) 1780 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) { 1781 trace(1, "\taddress %s not interesting, ignored\n", 1782 inet6_n2p(&sdst->sin6_addr)); 1783 return -1; 1784 } 1785 dst = &sdst->sin6_addr; 1786 if (sgw->sin6_family == AF_INET6) { 1787 /* easy case */ 1788 gw = &sgw->sin6_addr; 1789 prefix = sin6mask2len(smask); 1790 } else if (sgw->sin6_family == AF_LINK) { 1791 /* 1792 * Interface route... a hard case. We need to get the prefix 1793 * length from the kernel, but we now are parsing rtmsg. 1794 * We'll purge matching routes from my list, then get the 1795 * fresh list. 1796 */ 1797 struct riprt *longest; 1798 trace(1, "\t%s is a interface route, guessing prefixlen\n", 1799 inet6_n2p(dst)); 1800 longest = NULL; 1801 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 1802 if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 1803 &sdst->sin6_addr) 1804 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) { 1805 if (!longest 1806 || longest->rrt_info.rip6_plen < 1807 rrt->rrt_info.rip6_plen) { 1808 longest = rrt; 1809 } 1810 } 1811 } 1812 rrt = longest; 1813 if (!rrt) { 1814 trace(1, "\tno matching interface route found\n"); 1815 return -1; 1816 } 1817 gw = &in6addr_loopback; 1818 prefix = rrt->rrt_info.rip6_plen; 1819 } else { 1820 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family); 1821 return -1; 1822 } 1823 1824 trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix); 1825 trace(1, "gw %s\n", inet6_n2p(gw)); 1826 t_lifetime = time(NULL) - RIP_LIFETIME; 1827 /* age route for interface address */ 1828 memset(&ni6, 0, sizeof(ni6)); 1829 ni6.rip6_dest = *dst; 1830 ni6.rip6_plen = prefix; 1831 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 1832 trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest), 1833 ni6.rip6_plen); 1834 if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) { 1835 trace(1, "\tno route found\n"); 1836 return -1; 1837 } 1838 #if 0 1839 if ((rrt->rrt_flags & RTF_STATIC) == 0) { 1840 trace(1, "\tyou can delete static routes only\n"); 1841 } else 1842 #endif 1843 if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) { 1844 trace(1, "\tgw mismatch: %s <-> ", 1845 inet6_n2p(&rrt->rrt_gw)); 1846 trace(1, "%s\n", inet6_n2p(gw)); 1847 } else { 1848 trace(1, "\troute found, age it\n"); 1849 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1850 rrt->rrt_t = t_lifetime; 1851 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 1852 } 1853 } 1854 return 0; 1855 } 1856 1857 /* 1858 * remove specified address from internal interface/routing table. 1859 */ 1860 int 1861 rt_deladdr(ifcp, sifa, smask) 1862 struct ifc *ifcp; 1863 const struct sockaddr_in6 *sifa; 1864 const struct sockaddr_in6 *smask; 1865 { 1866 const struct in6_addr *addr = NULL; 1867 int prefix; 1868 struct ifac *ifa = NULL; 1869 struct netinfo6 ni6; 1870 struct riprt *rrt = NULL; 1871 time_t t_lifetime; 1872 int updated = 0; 1873 1874 if (sifa->sin6_family != AF_INET6) { 1875 trace(1, "\tother AF, ignored\n"); 1876 return -1; 1877 } 1878 addr = &sifa->sin6_addr; 1879 prefix = sin6mask2len(smask); 1880 1881 trace(1, "\tdeleting %s/%d from %s\n", 1882 inet6_n2p(addr), prefix, ifcp->ifc_name); 1883 ifa = ifa_match(ifcp, addr, prefix); 1884 if (!ifa) { 1885 trace(1, "\tno matching ifa found for %s/%d on %s\n", 1886 inet6_n2p(addr), prefix, ifcp->ifc_name); 1887 return -1; 1888 } 1889 if (ifa->ifa_conf != ifcp) { 1890 trace(1, "\taddress table corrupt: back pointer does not match " 1891 "(%s != %s)\n", 1892 ifcp->ifc_name, ifa->ifa_conf->ifc_name); 1893 return -1; 1894 } 1895 /* remove ifa from interface */ 1896 if (ifcp->ifc_addr == ifa) 1897 ifcp->ifc_addr = ifa->ifa_next; 1898 else { 1899 struct ifac *p; 1900 for (p = ifcp->ifc_addr; p; p = p->ifa_next) { 1901 if (p->ifa_next == ifa) { 1902 p->ifa_next = ifa->ifa_next; 1903 break; 1904 } 1905 } 1906 } 1907 ifa->ifa_next = NULL; 1908 ifa->ifa_conf = NULL; 1909 t_lifetime = time(NULL) - RIP_LIFETIME; 1910 /* age route for interface address */ 1911 memset(&ni6, 0, sizeof(ni6)); 1912 ni6.rip6_dest = ifa->ifa_addr; 1913 ni6.rip6_plen = ifa->ifa_plen; 1914 applyplen(&ni6.rip6_dest, ni6.rip6_plen); 1915 trace(1, "\tfind interface route %s/%d on %d\n", 1916 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index); 1917 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 1918 struct in6_addr none; 1919 memset(&none, 0, sizeof(none)); 1920 if (rrt->rrt_index == ifcp->ifc_index && 1921 (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) || 1922 IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) { 1923 trace(1, "\troute found, age it\n"); 1924 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1925 rrt->rrt_t = t_lifetime; 1926 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 1927 } 1928 updated++; 1929 } else { 1930 trace(1, "\tnon-interface route found: %s/%d on %d\n", 1931 inet6_n2p(&rrt->rrt_info.rip6_dest), 1932 rrt->rrt_info.rip6_plen, 1933 rrt->rrt_index); 1934 } 1935 } else 1936 trace(1, "\tno interface route found\n"); 1937 /* age route for p2p destination */ 1938 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1939 memset(&ni6, 0, sizeof(ni6)); 1940 ni6.rip6_dest = ifa->ifa_raddr; 1941 ni6.rip6_plen = 128; 1942 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 1943 trace(1, "\tfind p2p route %s/%d on %d\n", 1944 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, 1945 ifcp->ifc_index); 1946 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 1947 if (rrt->rrt_index == ifcp->ifc_index && 1948 IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) { 1949 trace(1, "\troute found, age it\n"); 1950 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1951 rrt->rrt_t = t_lifetime; 1952 rrt->rrt_info.rip6_metric = 1953 HOPCNT_INFINITY6; 1954 updated++; 1955 } 1956 } else { 1957 trace(1, "\tnon-p2p route found: %s/%d on %d\n", 1958 inet6_n2p(&rrt->rrt_info.rip6_dest), 1959 rrt->rrt_info.rip6_plen, 1960 rrt->rrt_index); 1961 } 1962 } else 1963 trace(1, "\tno p2p route found\n"); 1964 } 1965 return updated ? 0 : -1; 1966 } 1967 1968 /* 1969 * Get each interface address and put those interface routes to the route 1970 * list. 1971 */ 1972 int 1973 ifrt(ifcp, again) 1974 struct ifc *ifcp; 1975 int again; 1976 { 1977 struct ifac *ifa; 1978 struct riprt *rrt = NULL, *search_rrt, *prev_rrt, *loop_rrt; 1979 struct netinfo6 *np; 1980 time_t t_lifetime; 1981 int need_trigger = 0; 1982 1983 if (ifcp->ifc_flags & IFF_LOOPBACK) 1984 return 0; /* ignore loopback */ 1985 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1986 ifrt_p2p(ifcp, again); 1987 return 0; 1988 } 1989 1990 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 1991 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 1992 #if 0 1993 trace(1, "route: %s on %s: " 1994 "skip linklocal interface address\n", 1995 inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name); 1996 #endif 1997 continue; 1998 } 1999 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) { 2000 #if 0 2001 trace(1, "route: %s: skip unspec interface address\n", 2002 ifcp->ifc_name); 2003 #endif 2004 continue; 2005 } 2006 if (ifcp->ifc_flags & IFF_UP) { 2007 if ((rrt = MALLOC(struct riprt)) == NULL) 2008 fatal("malloc: struct riprt"); 2009 memset(rrt, 0, sizeof(*rrt)); 2010 rrt->rrt_same = NULL; 2011 rrt->rrt_index = ifcp->ifc_index; 2012 rrt->rrt_t = 0; /* don't age */ 2013 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2014 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2015 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2016 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 2017 rrt->rrt_flags = RTF_CLONING; 2018 rrt->rrt_rflags |= RRTF_CHANGED; 2019 applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen); 2020 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2021 rrt->rrt_gw = ifa->ifa_addr; 2022 np = &rrt->rrt_info; 2023 search_rrt = rtsearch(np, &prev_rrt); 2024 if (search_rrt != NULL) { 2025 if (search_rrt->rrt_info.rip6_metric <= 2026 rrt->rrt_info.rip6_metric) { 2027 /* Already have better route */ 2028 if (!again) { 2029 trace(1, "route: %s/%d: " 2030 "already registered (%s)\n", 2031 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2032 ifcp->ifc_name); 2033 } 2034 goto next; 2035 } 2036 2037 if (prev_rrt) 2038 prev_rrt->rrt_next = rrt->rrt_next; 2039 else 2040 riprt = rrt->rrt_next; 2041 delroute(&rrt->rrt_info, &rrt->rrt_gw); 2042 } 2043 /* Attach the route to the list */ 2044 trace(1, "route: %s/%d: register route (%s)\n", 2045 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2046 ifcp->ifc_name); 2047 rrt->rrt_next = riprt; 2048 riprt = rrt; 2049 addroute(rrt, &rrt->rrt_gw, ifcp); 2050 rrt = NULL; 2051 sendrequest(ifcp); 2052 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 2053 need_trigger = 1; 2054 } else { 2055 for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) { 2056 if (loop_rrt->rrt_index == ifcp->ifc_index) { 2057 t_lifetime = time(NULL) - RIP_LIFETIME; 2058 if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) { 2059 loop_rrt->rrt_t = t_lifetime; 2060 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 2061 loop_rrt->rrt_rflags |= RRTF_CHANGED; 2062 need_trigger = 1; 2063 } 2064 } 2065 } 2066 } 2067 next: 2068 if (rrt) 2069 free(rrt); 2070 } 2071 return need_trigger; 2072 } 2073 2074 /* 2075 * there are couple of p2p interface routing models. "behavior" lets 2076 * you pick one. it looks that gated behavior fits best with BSDs, 2077 * since BSD kernels does not look at prefix length on p2p interfaces. 2078 */ 2079 void 2080 ifrt_p2p(ifcp, again) 2081 struct ifc *ifcp; 2082 int again; 2083 { 2084 struct ifac *ifa; 2085 struct riprt *rrt, *orrt, *prevrrt; 2086 struct netinfo6 *np; 2087 struct in6_addr addr, dest; 2088 int advert, ignore, i; 2089 #define P2PADVERT_NETWORK 1 2090 #define P2PADVERT_ADDR 2 2091 #define P2PADVERT_DEST 4 2092 #define P2PADVERT_MAX 4 2093 const enum { CISCO, GATED, ROUTE6D } behavior = GATED; 2094 const char *category = ""; 2095 const char *noadv; 2096 2097 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2098 addr = ifa->ifa_addr; 2099 dest = ifa->ifa_raddr; 2100 applyplen(&addr, ifa->ifa_plen); 2101 applyplen(&dest, ifa->ifa_plen); 2102 advert = ignore = 0; 2103 switch (behavior) { 2104 case CISCO: 2105 /* 2106 * honor addr/plen, just like normal shared medium 2107 * interface. this may cause trouble if you reuse 2108 * addr/plen on other interfaces. 2109 * 2110 * advertise addr/plen. 2111 */ 2112 advert |= P2PADVERT_NETWORK; 2113 break; 2114 case GATED: 2115 /* 2116 * prefixlen on p2p interface is meaningless. 2117 * advertise addr/128 and dest/128. 2118 * 2119 * do not install network route to route6d routing 2120 * table (if we do, it would prevent route installation 2121 * for other p2p interface that shares addr/plen). 2122 * 2123 * XXX what should we do if dest is ::? it will not 2124 * get announced anyways (see following filter), 2125 * but we need to think. 2126 */ 2127 advert |= P2PADVERT_ADDR; 2128 advert |= P2PADVERT_DEST; 2129 ignore |= P2PADVERT_NETWORK; 2130 break; 2131 case ROUTE6D: 2132 /* 2133 * just for testing. actually the code is redundant 2134 * given the current p2p interface address assignment 2135 * rule for kame kernel. 2136 * 2137 * intent: 2138 * A/n -> announce A/n 2139 * A B/n, A and B share prefix -> A/n (= B/n) 2140 * A B/n, do not share prefix -> A/128 and B/128 2141 * actually, A/64 and A B/128 are the only cases 2142 * permitted by the kernel: 2143 * A/64 -> A/64 2144 * A B/128 -> A/128 and B/128 2145 */ 2146 if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) { 2147 if (IN6_ARE_ADDR_EQUAL(&addr, &dest)) 2148 advert |= P2PADVERT_NETWORK; 2149 else { 2150 advert |= P2PADVERT_ADDR; 2151 advert |= P2PADVERT_DEST; 2152 ignore |= P2PADVERT_NETWORK; 2153 } 2154 } else 2155 advert |= P2PADVERT_NETWORK; 2156 break; 2157 } 2158 2159 for (i = 1; i <= P2PADVERT_MAX; i *= 2) { 2160 if ((ignore & i) != 0) 2161 continue; 2162 if ((rrt = MALLOC(struct riprt)) == NULL) { 2163 fatal("malloc: struct riprt"); 2164 /*NOTREACHED*/ 2165 } 2166 memset(rrt, 0, sizeof(*rrt)); 2167 rrt->rrt_same = NULL; 2168 rrt->rrt_index = ifcp->ifc_index; 2169 rrt->rrt_t = 0; /* don't age */ 2170 switch (i) { 2171 case P2PADVERT_NETWORK: 2172 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2173 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 2174 applyplen(&rrt->rrt_info.rip6_dest, 2175 ifa->ifa_plen); 2176 category = "network"; 2177 break; 2178 case P2PADVERT_ADDR: 2179 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2180 rrt->rrt_info.rip6_plen = 128; 2181 rrt->rrt_gw = in6addr_loopback; 2182 category = "addr"; 2183 break; 2184 case P2PADVERT_DEST: 2185 rrt->rrt_info.rip6_dest = ifa->ifa_raddr; 2186 rrt->rrt_info.rip6_plen = 128; 2187 rrt->rrt_gw = ifa->ifa_addr; 2188 category = "dest"; 2189 break; 2190 } 2191 if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) || 2192 IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) { 2193 #if 0 2194 trace(1, "route: %s: skip unspec/linklocal " 2195 "(%s on %s)\n", category, ifcp->ifc_name); 2196 #endif 2197 free(rrt); 2198 continue; 2199 } 2200 if ((advert & i) == 0) { 2201 rrt->rrt_rflags |= RRTF_NOADVERTISE; 2202 noadv = ", NO-ADV"; 2203 } else 2204 noadv = ""; 2205 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2206 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2207 np = &rrt->rrt_info; 2208 orrt = rtsearch(np, &prevrrt); 2209 if (!orrt) { 2210 /* Attach the route to the list */ 2211 trace(1, "route: %s/%d: register route " 2212 "(%s on %s%s)\n", 2213 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2214 category, ifcp->ifc_name, noadv); 2215 rrt->rrt_next = riprt; 2216 riprt = rrt; 2217 } else if (rrt->rrt_index != orrt->rrt_index || 2218 rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) { 2219 /* swap route */ 2220 rrt->rrt_next = orrt->rrt_next; 2221 if (prevrrt) 2222 prevrrt->rrt_next = rrt; 2223 else 2224 riprt = rrt; 2225 free(orrt); 2226 2227 trace(1, "route: %s/%d: update (%s on %s%s)\n", 2228 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2229 category, ifcp->ifc_name, noadv); 2230 } else { 2231 /* Already found */ 2232 if (!again) { 2233 trace(1, "route: %s/%d: " 2234 "already registered (%s on %s%s)\n", 2235 inet6_n2p(&np->rip6_dest), 2236 np->rip6_plen, category, 2237 ifcp->ifc_name, noadv); 2238 } 2239 free(rrt); 2240 } 2241 } 2242 } 2243 #undef P2PADVERT_NETWORK 2244 #undef P2PADVERT_ADDR 2245 #undef P2PADVERT_DEST 2246 #undef P2PADVERT_MAX 2247 } 2248 2249 int 2250 getifmtu(ifindex) 2251 int ifindex; 2252 { 2253 int mib[6]; 2254 char *buf; 2255 size_t msize; 2256 struct if_msghdr *ifm; 2257 int mtu; 2258 2259 mib[0] = CTL_NET; 2260 mib[1] = PF_ROUTE; 2261 mib[2] = 0; 2262 mib[3] = AF_INET6; 2263 mib[4] = NET_RT_IFLIST; 2264 mib[5] = ifindex; 2265 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2266 fatal("sysctl estimate NET_RT_IFLIST"); 2267 /*NOTREACHED*/ 2268 } 2269 if ((buf = malloc(msize)) == NULL) { 2270 fatal("malloc"); 2271 /*NOTREACHED*/ 2272 } 2273 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2274 fatal("sysctl NET_RT_IFLIST"); 2275 /*NOTREACHED*/ 2276 } 2277 ifm = (struct if_msghdr *)buf; 2278 mtu = ifm->ifm_data.ifi_mtu; 2279 #ifdef __FreeBSD__ 2280 if (ifindex != ifm->ifm_index) { 2281 fatal("ifindex does not match with ifm_index"); 2282 /*NOTREACHED*/ 2283 } 2284 #endif 2285 free(buf); 2286 return mtu; 2287 } 2288 2289 const char * 2290 rttypes(rtm) 2291 struct rt_msghdr *rtm; 2292 { 2293 #define RTTYPE(s, f) \ 2294 do { \ 2295 if (rtm->rtm_type == (f)) \ 2296 return (s); \ 2297 } while (0) 2298 RTTYPE("ADD", RTM_ADD); 2299 RTTYPE("DELETE", RTM_DELETE); 2300 RTTYPE("CHANGE", RTM_CHANGE); 2301 RTTYPE("GET", RTM_GET); 2302 RTTYPE("LOSING", RTM_LOSING); 2303 RTTYPE("REDIRECT", RTM_REDIRECT); 2304 RTTYPE("MISS", RTM_MISS); 2305 RTTYPE("LOCK", RTM_LOCK); 2306 RTTYPE("OLDADD", RTM_OLDADD); 2307 RTTYPE("OLDDEL", RTM_OLDDEL); 2308 RTTYPE("RESOLVE", RTM_RESOLVE); 2309 RTTYPE("NEWADDR", RTM_NEWADDR); 2310 RTTYPE("DELADDR", RTM_DELADDR); 2311 RTTYPE("IFINFO", RTM_IFINFO); 2312 #ifdef RTM_OLDADD 2313 RTTYPE("OLDADD", RTM_OLDADD); 2314 #endif 2315 #ifdef RTM_OLDDEL 2316 RTTYPE("OLDDEL", RTM_OLDDEL); 2317 #endif 2318 #ifdef RTM_OIFINFO 2319 RTTYPE("OIFINFO", RTM_OIFINFO); 2320 #endif 2321 #ifdef RTM_IFANNOUNCE 2322 RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE); 2323 #endif 2324 #ifdef RTM_NEWMADDR 2325 RTTYPE("NEWMADDR", RTM_NEWMADDR); 2326 #endif 2327 #ifdef RTM_DELMADDR 2328 RTTYPE("DELMADDR", RTM_DELMADDR); 2329 #endif 2330 #undef RTTYPE 2331 return NULL; 2332 } 2333 2334 const char * 2335 rtflags(rtm) 2336 struct rt_msghdr *rtm; 2337 { 2338 static char buf[BUFSIZ]; 2339 2340 /* 2341 * letter conflict should be okay. painful when *BSD diverges... 2342 */ 2343 strlcpy(buf, "", sizeof(buf)); 2344 #define RTFLAG(s, f) \ 2345 do { \ 2346 if (rtm->rtm_flags & (f)) \ 2347 strlcat(buf, (s), sizeof(buf)); \ 2348 } while (0) 2349 RTFLAG("U", RTF_UP); 2350 RTFLAG("G", RTF_GATEWAY); 2351 RTFLAG("H", RTF_HOST); 2352 RTFLAG("R", RTF_REJECT); 2353 RTFLAG("D", RTF_DYNAMIC); 2354 RTFLAG("M", RTF_MODIFIED); 2355 RTFLAG("d", RTF_DONE); 2356 #ifdef RTF_MASK 2357 RTFLAG("m", RTF_MASK); 2358 #endif 2359 RTFLAG("C", RTF_CLONING); 2360 #ifdef RTF_CLONED 2361 RTFLAG("c", RTF_CLONED); 2362 #endif 2363 #ifdef RTF_PRCLONING 2364 RTFLAG("c", RTF_PRCLONING); 2365 #endif 2366 #ifdef RTF_WASCLONED 2367 RTFLAG("W", RTF_WASCLONED); 2368 #endif 2369 RTFLAG("X", RTF_XRESOLVE); 2370 RTFLAG("L", RTF_LLINFO); 2371 RTFLAG("S", RTF_STATIC); 2372 RTFLAG("B", RTF_BLACKHOLE); 2373 #ifdef RTF_PROTO3 2374 RTFLAG("3", RTF_PROTO3); 2375 #endif 2376 RTFLAG("2", RTF_PROTO2); 2377 RTFLAG("1", RTF_PROTO1); 2378 #ifdef RTF_BROADCAST 2379 RTFLAG("b", RTF_BROADCAST); 2380 #endif 2381 #ifdef RTF_DEFAULT 2382 RTFLAG("d", RTF_DEFAULT); 2383 #endif 2384 #ifdef RTF_ISAROUTER 2385 RTFLAG("r", RTF_ISAROUTER); 2386 #endif 2387 #ifdef RTF_TUNNEL 2388 RTFLAG("T", RTF_TUNNEL); 2389 #endif 2390 #ifdef RTF_AUTH 2391 RTFLAG("A", RTF_AUTH); 2392 #endif 2393 #ifdef RTF_CRYPT 2394 RTFLAG("E", RTF_CRYPT); 2395 #endif 2396 #undef RTFLAG 2397 return buf; 2398 } 2399 2400 const char * 2401 ifflags(flags) 2402 int flags; 2403 { 2404 static char buf[BUFSIZ]; 2405 2406 strlcpy(buf, "", sizeof(buf)); 2407 #define IFFLAG(s, f) \ 2408 do { \ 2409 if (flags & (f)) { \ 2410 if (buf[0]) \ 2411 strlcat(buf, ",", sizeof(buf)); \ 2412 strlcat(buf, (s), sizeof(buf)); \ 2413 } \ 2414 } while (0) 2415 IFFLAG("UP", IFF_UP); 2416 IFFLAG("BROADCAST", IFF_BROADCAST); 2417 IFFLAG("DEBUG", IFF_DEBUG); 2418 IFFLAG("LOOPBACK", IFF_LOOPBACK); 2419 IFFLAG("POINTOPOINT", IFF_POINTOPOINT); 2420 #ifdef IFF_NOTRAILERS 2421 IFFLAG("NOTRAILERS", IFF_NOTRAILERS); 2422 #endif 2423 #ifdef IFF_SMART 2424 IFFLAG("SMART", IFF_SMART); 2425 #endif 2426 IFFLAG("RUNNING", IFF_RUNNING); 2427 IFFLAG("NOARP", IFF_NOARP); 2428 IFFLAG("PROMISC", IFF_PROMISC); 2429 IFFLAG("ALLMULTI", IFF_ALLMULTI); 2430 IFFLAG("OACTIVE", IFF_OACTIVE); 2431 IFFLAG("SIMPLEX", IFF_SIMPLEX); 2432 IFFLAG("LINK0", IFF_LINK0); 2433 IFFLAG("LINK1", IFF_LINK1); 2434 IFFLAG("LINK2", IFF_LINK2); 2435 IFFLAG("MULTICAST", IFF_MULTICAST); 2436 #undef IFFLAG 2437 return buf; 2438 } 2439 2440 void 2441 krtread(again) 2442 int again; 2443 { 2444 int mib[6]; 2445 size_t msize; 2446 char *buf, *p, *lim; 2447 struct rt_msghdr *rtm; 2448 int retry; 2449 const char *errmsg; 2450 2451 retry = 0; 2452 buf = NULL; 2453 mib[0] = CTL_NET; 2454 mib[1] = PF_ROUTE; 2455 mib[2] = 0; 2456 mib[3] = AF_INET6; /* Address family */ 2457 mib[4] = NET_RT_DUMP; /* Dump the kernel routing table */ 2458 mib[5] = 0; /* No flags */ 2459 do { 2460 retry++; 2461 errmsg = NULL; 2462 if (buf) 2463 free(buf); 2464 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2465 errmsg = "sysctl estimate"; 2466 continue; 2467 } 2468 if ((buf = malloc(msize)) == NULL) { 2469 errmsg = "malloc"; 2470 continue; 2471 } 2472 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2473 errmsg = "sysctl NET_RT_DUMP"; 2474 continue; 2475 } 2476 } while (retry < 5 && errmsg != NULL); 2477 if (errmsg) { 2478 fatal("%s (with %d retries, msize=%lu)", errmsg, retry, 2479 (u_long)msize); 2480 /*NOTREACHED*/ 2481 } else if (1 < retry) 2482 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry); 2483 2484 lim = buf + msize; 2485 for (p = buf; p < lim; p += rtm->rtm_msglen) { 2486 rtm = (struct rt_msghdr *)p; 2487 rt_entry(rtm, again); 2488 } 2489 free(buf); 2490 } 2491 2492 void 2493 rt_entry(rtm, again) 2494 struct rt_msghdr *rtm; 2495 int again; 2496 { 2497 struct sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask; 2498 struct sockaddr_in6 *sin6_genmask, *sin6_ifp; 2499 char *rtmp, *ifname = NULL; 2500 struct riprt *rrt, *orrt; 2501 struct netinfo6 *np; 2502 int s; 2503 2504 sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0; 2505 if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags & 2506 (RTF_CLONING|RTF_XRESOLVE|RTF_LLINFO|RTF_BLACKHOLE)) { 2507 return; /* not interested in the link route */ 2508 } 2509 /* do not look at cloned routes */ 2510 #ifdef RTF_WASCLONED 2511 if (rtm->rtm_flags & RTF_WASCLONED) 2512 return; 2513 #endif 2514 #ifdef RTF_CLONED 2515 if (rtm->rtm_flags & RTF_CLONED) 2516 return; 2517 #endif 2518 /* 2519 * do not look at dynamic routes. 2520 * netbsd/openbsd cloned routes have UGHD. 2521 */ 2522 if (rtm->rtm_flags & RTF_DYNAMIC) 2523 return; 2524 rtmp = (char *)(rtm + 1); 2525 /* Destination */ 2526 if ((rtm->rtm_addrs & RTA_DST) == 0) 2527 return; /* ignore routes without destination address */ 2528 sin6_dst = (struct sockaddr_in6 *)rtmp; 2529 rtmp += ROUNDUP(sin6_dst->sin6_len); 2530 if (rtm->rtm_addrs & RTA_GATEWAY) { 2531 sin6_gw = (struct sockaddr_in6 *)rtmp; 2532 rtmp += ROUNDUP(sin6_gw->sin6_len); 2533 } 2534 if (rtm->rtm_addrs & RTA_NETMASK) { 2535 sin6_mask = (struct sockaddr_in6 *)rtmp; 2536 rtmp += ROUNDUP(sin6_mask->sin6_len); 2537 } 2538 if (rtm->rtm_addrs & RTA_GENMASK) { 2539 sin6_genmask = (struct sockaddr_in6 *)rtmp; 2540 rtmp += ROUNDUP(sin6_genmask->sin6_len); 2541 } 2542 if (rtm->rtm_addrs & RTA_IFP) { 2543 sin6_ifp = (struct sockaddr_in6 *)rtmp; 2544 rtmp += ROUNDUP(sin6_ifp->sin6_len); 2545 } 2546 2547 /* Destination */ 2548 if (sin6_dst->sin6_family != AF_INET6) 2549 return; 2550 if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr)) 2551 return; /* Link-local */ 2552 if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback)) 2553 return; /* Loopback */ 2554 if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr)) 2555 return; 2556 2557 if ((rrt = MALLOC(struct riprt)) == NULL) { 2558 fatal("malloc: struct riprt"); 2559 /*NOTREACHED*/ 2560 } 2561 memset(rrt, 0, sizeof(*rrt)); 2562 np = &rrt->rrt_info; 2563 rrt->rrt_same = NULL; 2564 rrt->rrt_t = time(NULL); 2565 if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC)) 2566 rrt->rrt_t = 0; /* Don't age static routes */ 2567 np->rip6_tag = 0; 2568 np->rip6_metric = rtm->rtm_rmx.rmx_hopcount; 2569 if (np->rip6_metric < 1) 2570 np->rip6_metric = 1; 2571 rrt->rrt_flags = rtm->rtm_flags; 2572 np->rip6_dest = sin6_dst->sin6_addr; 2573 2574 /* Mask or plen */ 2575 if (rtm->rtm_flags & RTF_HOST) 2576 np->rip6_plen = 128; /* Host route */ 2577 else if (sin6_mask) 2578 np->rip6_plen = sin6mask2len(sin6_mask); 2579 else 2580 np->rip6_plen = 0; 2581 2582 orrt = rtsearch(np, NULL); 2583 if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) { 2584 /* Already found */ 2585 if (!again) { 2586 trace(1, "route: %s/%d flags %s: already registered\n", 2587 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2588 rtflags(rtm)); 2589 } 2590 free(rrt); 2591 return; 2592 } 2593 /* Gateway */ 2594 if (!sin6_gw) 2595 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2596 else { 2597 if (sin6_gw->sin6_family == AF_INET6) 2598 rrt->rrt_gw = sin6_gw->sin6_addr; 2599 else if (sin6_gw->sin6_family == AF_LINK) { 2600 /* XXX in case ppp link? */ 2601 rrt->rrt_gw = in6addr_loopback; 2602 } else 2603 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2604 } 2605 trace(1, "route: %s/%d flags %s", 2606 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm)); 2607 trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw)); 2608 2609 /* Interface */ 2610 s = rtm->rtm_index; 2611 if (s < nindex2ifc && index2ifc[s]) 2612 ifname = index2ifc[s]->ifc_name; 2613 else { 2614 trace(1, " not configured\n"); 2615 free(rrt); 2616 return; 2617 } 2618 trace(1, " if %s sock %d", ifname, s); 2619 rrt->rrt_index = s; 2620 2621 trace(1, "\n"); 2622 2623 /* Check gateway */ 2624 if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) && 2625 !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw) 2626 #ifdef __FreeBSD__ 2627 && (rrt->rrt_flags & RTF_LOCAL) == 0 2628 #endif 2629 ) { 2630 trace(0, "***** Gateway %s is not a link-local address.\n", 2631 inet6_n2p(&rrt->rrt_gw)); 2632 trace(0, "***** dest(%s) if(%s) -- Not optimized.\n", 2633 inet6_n2p(&rrt->rrt_info.rip6_dest), ifname); 2634 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR; 2635 } 2636 2637 /* Put it to the route list */ 2638 if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) { 2639 /* replace route list */ 2640 rrt->rrt_next = orrt->rrt_next; 2641 *orrt = *rrt; 2642 trace(1, "route: %s/%d flags %s: replace new route\n", 2643 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2644 rtflags(rtm)); 2645 free(rrt); 2646 } else { 2647 rrt->rrt_next = riprt; 2648 riprt = rrt; 2649 } 2650 } 2651 2652 int 2653 addroute(rrt, gw, ifcp) 2654 struct riprt *rrt; 2655 const struct in6_addr *gw; 2656 struct ifc *ifcp; 2657 { 2658 struct netinfo6 *np; 2659 u_char buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ]; 2660 struct rt_msghdr *rtm; 2661 struct sockaddr_in6 *sin6; 2662 int len; 2663 2664 np = &rrt->rrt_info; 2665 inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1)); 2666 inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2)); 2667 tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n", 2668 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2669 np->rip6_metric - 1, buf2); 2670 if (rtlog) 2671 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(), 2672 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2673 np->rip6_metric - 1, buf2); 2674 if (nflag) 2675 return 0; 2676 2677 memset(buf, 0, sizeof(buf)); 2678 rtm = (struct rt_msghdr *)buf; 2679 rtm->rtm_type = RTM_ADD; 2680 rtm->rtm_version = RTM_VERSION; 2681 rtm->rtm_seq = ++seq; 2682 rtm->rtm_pid = pid; 2683 rtm->rtm_flags = rrt->rrt_flags; 2684 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2685 rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1; 2686 rtm->rtm_inits = RTV_HOPCOUNT; 2687 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2688 /* Destination */ 2689 sin6->sin6_len = sizeof(struct sockaddr_in6); 2690 sin6->sin6_family = AF_INET6; 2691 sin6->sin6_addr = np->rip6_dest; 2692 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2693 /* Gateway */ 2694 sin6->sin6_len = sizeof(struct sockaddr_in6); 2695 sin6->sin6_family = AF_INET6; 2696 sin6->sin6_addr = *gw; 2697 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2698 /* Netmask */ 2699 sin6->sin6_len = sizeof(struct sockaddr_in6); 2700 sin6->sin6_family = AF_INET6; 2701 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2702 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2703 2704 len = (char *)sin6 - (char *)buf; 2705 rtm->rtm_msglen = len; 2706 if (write(rtsock, buf, len) > 0) 2707 return 0; 2708 2709 if (errno == EEXIST) { 2710 trace(0, "ADD: Route already exists %s/%d gw %s\n", 2711 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2712 if (rtlog) 2713 fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n", 2714 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2715 } else { 2716 trace(0, "Can not write to rtsock (addroute): %s\n", 2717 strerror(errno)); 2718 if (rtlog) 2719 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2720 strerror(errno)); 2721 } 2722 return -1; 2723 } 2724 2725 int 2726 delroute(np, gw) 2727 struct netinfo6 *np; 2728 struct in6_addr *gw; 2729 { 2730 u_char buf[BUFSIZ], buf2[BUFSIZ]; 2731 struct rt_msghdr *rtm; 2732 struct sockaddr_in6 *sin6; 2733 int len; 2734 2735 inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2)); 2736 tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest), 2737 np->rip6_plen, buf2); 2738 if (rtlog) 2739 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n", 2740 hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2741 if (nflag) 2742 return 0; 2743 2744 memset(buf, 0, sizeof(buf)); 2745 rtm = (struct rt_msghdr *)buf; 2746 rtm->rtm_type = RTM_DELETE; 2747 rtm->rtm_version = RTM_VERSION; 2748 rtm->rtm_seq = ++seq; 2749 rtm->rtm_pid = pid; 2750 rtm->rtm_flags = RTF_UP | RTF_GATEWAY; 2751 if (np->rip6_plen == sizeof(struct in6_addr) * 8) 2752 rtm->rtm_flags |= RTF_HOST; 2753 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2754 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2755 /* Destination */ 2756 sin6->sin6_len = sizeof(struct sockaddr_in6); 2757 sin6->sin6_family = AF_INET6; 2758 sin6->sin6_addr = np->rip6_dest; 2759 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2760 /* Gateway */ 2761 sin6->sin6_len = sizeof(struct sockaddr_in6); 2762 sin6->sin6_family = AF_INET6; 2763 sin6->sin6_addr = *gw; 2764 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2765 /* Netmask */ 2766 sin6->sin6_len = sizeof(struct sockaddr_in6); 2767 sin6->sin6_family = AF_INET6; 2768 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2769 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2770 2771 len = (char *)sin6 - (char *)buf; 2772 rtm->rtm_msglen = len; 2773 if (write(rtsock, buf, len) >= 0) 2774 return 0; 2775 2776 if (errno == ESRCH) { 2777 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n", 2778 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2779 if (rtlog) 2780 fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n", 2781 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2782 } else { 2783 trace(0, "Can not write to rtsock (delroute): %s\n", 2784 strerror(errno)); 2785 if (rtlog) 2786 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2787 strerror(errno)); 2788 } 2789 return -1; 2790 } 2791 2792 struct in6_addr * 2793 getroute(np, gw) 2794 struct netinfo6 *np; 2795 struct in6_addr *gw; 2796 { 2797 u_char buf[BUFSIZ]; 2798 u_long myseq; 2799 int len; 2800 struct rt_msghdr *rtm; 2801 struct sockaddr_in6 *sin6; 2802 2803 rtm = (struct rt_msghdr *)buf; 2804 len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6); 2805 memset(rtm, 0, len); 2806 rtm->rtm_type = RTM_GET; 2807 rtm->rtm_version = RTM_VERSION; 2808 myseq = ++seq; 2809 rtm->rtm_seq = myseq; 2810 rtm->rtm_addrs = RTA_DST; 2811 rtm->rtm_msglen = len; 2812 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2813 sin6->sin6_len = sizeof(struct sockaddr_in6); 2814 sin6->sin6_family = AF_INET6; 2815 sin6->sin6_addr = np->rip6_dest; 2816 if (write(rtsock, buf, len) < 0) { 2817 if (errno == ESRCH) /* No such route found */ 2818 return NULL; 2819 perror("write to rtsock"); 2820 exit(1); 2821 } 2822 do { 2823 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 2824 perror("read from rtsock"); 2825 exit(1); 2826 } 2827 rtm = (struct rt_msghdr *)buf; 2828 } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid); 2829 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2830 if (rtm->rtm_addrs & RTA_DST) { 2831 sin6 = (struct sockaddr_in6 *) 2832 ((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2833 } 2834 if (rtm->rtm_addrs & RTA_GATEWAY) { 2835 *gw = sin6->sin6_addr; 2836 return gw; 2837 } 2838 return NULL; 2839 } 2840 2841 const char * 2842 inet6_n2p(p) 2843 const struct in6_addr *p; 2844 { 2845 static char buf[BUFSIZ]; 2846 2847 return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf)); 2848 } 2849 2850 void 2851 ifrtdump(sig) 2852 int sig; 2853 { 2854 2855 ifdump(sig); 2856 rtdump(sig); 2857 } 2858 2859 void 2860 ifdump(sig) 2861 int sig; 2862 { 2863 struct ifc *ifcp; 2864 FILE *dump; 2865 int i; 2866 2867 if (sig == 0) 2868 dump = stderr; 2869 else 2870 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 2871 dump = stderr; 2872 2873 fprintf(dump, "%s: Interface Table Dump\n", hms()); 2874 fprintf(dump, " Number of interfaces: %d\n", nifc); 2875 for (i = 0; i < 2; i++) { 2876 fprintf(dump, " %sadvertising interfaces:\n", i ? "non-" : ""); 2877 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 2878 if (i == 0) { 2879 if ((ifcp->ifc_flags & IFF_UP) == 0) 2880 continue; 2881 if (iff_find(ifcp, 'N') != NULL) 2882 continue; 2883 } else { 2884 if (ifcp->ifc_flags & IFF_UP) 2885 continue; 2886 } 2887 ifdump0(dump, ifcp); 2888 } 2889 } 2890 fprintf(dump, "\n"); 2891 if (dump != stderr) 2892 fclose(dump); 2893 } 2894 2895 void 2896 ifdump0(dump, ifcp) 2897 FILE *dump; 2898 const struct ifc *ifcp; 2899 { 2900 struct ifac *ifa; 2901 struct iff *iffp; 2902 char buf[BUFSIZ]; 2903 const char *ft; 2904 int addr; 2905 2906 fprintf(dump, " %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n", 2907 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags), 2908 inet6_n2p(&ifcp->ifc_mylladdr), 2909 ifcp->ifc_mtu, ifcp->ifc_metric); 2910 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2911 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 2912 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, 2913 buf, sizeof(buf)); 2914 fprintf(dump, "\t%s/%d -- %s\n", 2915 inet6_n2p(&ifa->ifa_addr), 2916 ifa->ifa_plen, buf); 2917 } else { 2918 fprintf(dump, "\t%s/%d\n", 2919 inet6_n2p(&ifa->ifa_addr), 2920 ifa->ifa_plen); 2921 } 2922 } 2923 if (ifcp->ifc_filter) { 2924 fprintf(dump, "\tFilter:"); 2925 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 2926 addr = 0; 2927 switch (iffp->iff_type) { 2928 case 'A': 2929 ft = "Aggregate"; addr++; break; 2930 case 'N': 2931 ft = "No-use"; break; 2932 case 'O': 2933 ft = "Advertise-only"; addr++; break; 2934 case 'T': 2935 ft = "Default-only"; break; 2936 case 'L': 2937 ft = "Listen-only"; addr++; break; 2938 default: 2939 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type); 2940 ft = buf; 2941 addr++; 2942 break; 2943 } 2944 fprintf(dump, " %s", ft); 2945 if (addr) { 2946 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr), 2947 iffp->iff_plen); 2948 } 2949 } 2950 fprintf(dump, "\n"); 2951 } 2952 } 2953 2954 void 2955 rtdump(sig) 2956 int sig; 2957 { 2958 struct riprt *rrt; 2959 char buf[BUFSIZ]; 2960 FILE *dump; 2961 time_t t, age; 2962 2963 if (sig == 0) 2964 dump = stderr; 2965 else 2966 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 2967 dump = stderr; 2968 2969 t = time(NULL); 2970 fprintf(dump, "\n%s: Routing Table Dump\n", hms()); 2971 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 2972 if (rrt->rrt_t == 0) 2973 age = 0; 2974 else 2975 age = t - rrt->rrt_t; 2976 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest, 2977 buf, sizeof(buf)); 2978 fprintf(dump, " %s/%d if(%d:%s) gw(%s) [%d] age(%ld)", 2979 buf, rrt->rrt_info.rip6_plen, rrt->rrt_index, 2980 index2ifc[rrt->rrt_index]->ifc_name, 2981 inet6_n2p(&rrt->rrt_gw), 2982 rrt->rrt_info.rip6_metric, (long)age); 2983 if (rrt->rrt_info.rip6_tag) { 2984 fprintf(dump, " tag(0x%04x)", 2985 ntohs(rrt->rrt_info.rip6_tag) & 0xffff); 2986 } 2987 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) 2988 fprintf(dump, " NOT-LL"); 2989 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 2990 fprintf(dump, " NO-ADV"); 2991 fprintf(dump, "\n"); 2992 } 2993 fprintf(dump, "\n"); 2994 if (dump != stderr) 2995 fclose(dump); 2996 } 2997 2998 /* 2999 * Parse the -A (and -O) options and put corresponding filter object to the 3000 * specified interface structures. Each of the -A/O option has the following 3001 * syntax: -A 5f09:c400::/32,ef0,ef1 (aggregate) 3002 * -O 5f09:c400::/32,ef0,ef1 (only when match) 3003 */ 3004 void 3005 filterconfig() 3006 { 3007 int i; 3008 char *p, *ap, *iflp, *ifname; 3009 struct iff ftmp, *iff_obj; 3010 struct ifc *ifcp; 3011 struct riprt *rrt; 3012 #if 0 3013 struct in6_addr gw; 3014 #endif 3015 3016 for (i = 0; i < nfilter; i++) { 3017 ap = filter[i]; 3018 iflp = NULL; 3019 ifcp = NULL; 3020 if (filtertype[i] == 'N' || filtertype[i] == 'T') { 3021 iflp = ap; 3022 goto ifonly; 3023 } 3024 if ((p = index(ap, ',')) != NULL) { 3025 *p++ = '\0'; 3026 iflp = p; 3027 } 3028 if ((p = index(ap, '/')) == NULL) { 3029 fatal("no prefixlen specified for '%s'", ap); 3030 /*NOTREACHED*/ 3031 } 3032 *p++ = '\0'; 3033 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) { 3034 fatal("invalid prefix specified for '%s'", ap); 3035 /*NOTREACHED*/ 3036 } 3037 ftmp.iff_plen = atoi(p); 3038 ftmp.iff_next = NULL; 3039 applyplen(&ftmp.iff_addr, ftmp.iff_plen); 3040 ifonly: 3041 ftmp.iff_type = filtertype[i]; 3042 if (iflp == NULL || *iflp == '\0') { 3043 fatal("no interface specified for '%s'", ap); 3044 /*NOTREACHED*/ 3045 } 3046 /* parse the interface listing portion */ 3047 while (iflp) { 3048 ifname = iflp; 3049 if ((iflp = index(iflp, ',')) != NULL) 3050 *iflp++ = '\0'; 3051 ifcp = ifc_find(ifname); 3052 if (ifcp == NULL) { 3053 fatal("no interface %s exists", ifname); 3054 /*NOTREACHED*/ 3055 } 3056 iff_obj = (struct iff *)malloc(sizeof(struct iff)); 3057 if (iff_obj == NULL) { 3058 fatal("malloc of iff_obj"); 3059 /*NOTREACHED*/ 3060 } 3061 memcpy((void *)iff_obj, (void *)&ftmp, 3062 sizeof(struct iff)); 3063 /* link it to the interface filter */ 3064 iff_obj->iff_next = ifcp->ifc_filter; 3065 ifcp->ifc_filter = iff_obj; 3066 } 3067 3068 /* 3069 * -A: aggregate configuration. 3070 */ 3071 if (filtertype[i] != 'A') 3072 continue; 3073 /* put the aggregate to the kernel routing table */ 3074 rrt = (struct riprt *)malloc(sizeof(struct riprt)); 3075 if (rrt == NULL) { 3076 fatal("malloc: rrt"); 3077 /*NOTREACHED*/ 3078 } 3079 memset(rrt, 0, sizeof(struct riprt)); 3080 rrt->rrt_info.rip6_dest = ftmp.iff_addr; 3081 rrt->rrt_info.rip6_plen = ftmp.iff_plen; 3082 rrt->rrt_info.rip6_metric = 1; 3083 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 3084 rrt->rrt_gw = in6addr_loopback; 3085 rrt->rrt_flags = RTF_UP | RTF_REJECT; 3086 rrt->rrt_rflags = RRTF_AGGREGATE; 3087 rrt->rrt_t = 0; 3088 rrt->rrt_index = loopifindex; 3089 #if 0 3090 if (getroute(&rrt->rrt_info, &gw)) { 3091 #if 0 3092 /* 3093 * When the address has already been registered in the 3094 * kernel routing table, it should be removed 3095 */ 3096 delroute(&rrt->rrt_info, &gw); 3097 #else 3098 /* it is safer behavior */ 3099 errno = EINVAL; 3100 fatal("%s/%u already in routing table, " 3101 "cannot aggregate", 3102 inet6_n2p(&rrt->rrt_info.rip6_dest), 3103 rrt->rrt_info.rip6_plen); 3104 /*NOTREACHED*/ 3105 #endif 3106 } 3107 #endif 3108 /* Put the route to the list */ 3109 rrt->rrt_next = riprt; 3110 riprt = rrt; 3111 trace(1, "Aggregate: %s/%d for %s\n", 3112 inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen, 3113 ifcp->ifc_name); 3114 /* Add this route to the kernel */ 3115 if (nflag) /* do not modify kernel routing table */ 3116 continue; 3117 addroute(rrt, &in6addr_loopback, loopifcp); 3118 } 3119 } 3120 3121 /***************** utility functions *****************/ 3122 3123 /* 3124 * Returns a pointer to ifac whose address and prefix length matches 3125 * with the address and prefix length specified in the arguments. 3126 */ 3127 struct ifac * 3128 ifa_match(ifcp, ia, plen) 3129 const struct ifc *ifcp; 3130 const struct in6_addr *ia; 3131 int plen; 3132 { 3133 struct ifac *ifa; 3134 3135 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 3136 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) && 3137 ifa->ifa_plen == plen) 3138 break; 3139 } 3140 return ifa; 3141 } 3142 3143 /* 3144 * Return a pointer to riprt structure whose address and prefix length 3145 * matches with the address and prefix length found in the argument. 3146 * Note: This is not a rtalloc(). Therefore exact match is necessary. 3147 */ 3148 struct riprt * 3149 rtsearch(np, prev_rrt) 3150 struct netinfo6 *np; 3151 struct riprt **prev_rrt; 3152 { 3153 struct riprt *rrt; 3154 3155 if (prev_rrt) 3156 *prev_rrt = NULL; 3157 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 3158 if (rrt->rrt_info.rip6_plen == np->rip6_plen && 3159 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 3160 &np->rip6_dest)) 3161 return rrt; 3162 if (prev_rrt) 3163 *prev_rrt = rrt; 3164 } 3165 if (prev_rrt) 3166 *prev_rrt = NULL; 3167 return 0; 3168 } 3169 3170 int 3171 sin6mask2len(sin6) 3172 const struct sockaddr_in6 *sin6; 3173 { 3174 3175 return mask2len(&sin6->sin6_addr, 3176 sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr)); 3177 } 3178 3179 int 3180 mask2len(addr, lenlim) 3181 const struct in6_addr *addr; 3182 int lenlim; 3183 { 3184 int i = 0, j; 3185 const u_char *p = (const u_char *)addr; 3186 3187 for (j = 0; j < lenlim; j++, p++) { 3188 if (*p != 0xff) 3189 break; 3190 i += 8; 3191 } 3192 if (j < lenlim) { 3193 switch (*p) { 3194 #define MASKLEN(m, l) case m: do { i += l; break; } while (0) 3195 MASKLEN(0xfe, 7); break; 3196 MASKLEN(0xfc, 6); break; 3197 MASKLEN(0xf8, 5); break; 3198 MASKLEN(0xf0, 4); break; 3199 MASKLEN(0xe0, 3); break; 3200 MASKLEN(0xc0, 2); break; 3201 MASKLEN(0x80, 1); break; 3202 #undef MASKLEN 3203 } 3204 } 3205 return i; 3206 } 3207 3208 void 3209 applymask(addr, mask) 3210 struct in6_addr *addr, *mask; 3211 { 3212 int i; 3213 u_long *p, *q; 3214 3215 p = (u_long *)addr; q = (u_long *)mask; 3216 for (i = 0; i < 4; i++) 3217 *p++ &= *q++; 3218 } 3219 3220 static const u_char plent[8] = { 3221 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe 3222 }; 3223 3224 void 3225 applyplen(ia, plen) 3226 struct in6_addr *ia; 3227 int plen; 3228 { 3229 u_char *p; 3230 int i; 3231 3232 p = ia->s6_addr; 3233 for (i = 0; i < 16; i++) { 3234 if (plen <= 0) 3235 *p = 0; 3236 else if (plen < 8) 3237 *p &= plent[plen]; 3238 p++, plen -= 8; 3239 } 3240 } 3241 3242 static const int pl2m[9] = { 3243 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff 3244 }; 3245 3246 struct in6_addr * 3247 plen2mask(n) 3248 int n; 3249 { 3250 static struct in6_addr ia; 3251 u_char *p; 3252 int i; 3253 3254 memset(&ia, 0, sizeof(struct in6_addr)); 3255 p = (u_char *)&ia; 3256 for (i = 0; i < 16; i++, p++, n -= 8) { 3257 if (n >= 8) { 3258 *p = 0xff; 3259 continue; 3260 } 3261 *p = pl2m[n]; 3262 break; 3263 } 3264 return &ia; 3265 } 3266 3267 char * 3268 allocopy(p) 3269 char *p; 3270 { 3271 char *q = (char *)malloc(strlen(p) + 1); 3272 3273 strcpy(q, p); 3274 return q; 3275 } 3276 3277 char * 3278 hms() 3279 { 3280 static char buf[BUFSIZ]; 3281 time_t t; 3282 struct tm *tm; 3283 3284 t = time(NULL); 3285 if ((tm = localtime(&t)) == 0) { 3286 fatal("localtime"); 3287 /*NOTREACHED*/ 3288 } 3289 snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min, 3290 tm->tm_sec); 3291 return buf; 3292 } 3293 3294 #define RIPRANDDEV 1.0 /* 30 +- 15, max - min = 30 */ 3295 3296 int 3297 ripinterval(timer) 3298 int timer; 3299 { 3300 double r = rand(); 3301 3302 interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5)); 3303 nextalarm = time(NULL) + interval; 3304 return interval; 3305 } 3306 3307 time_t 3308 ripsuptrig() 3309 { 3310 time_t t; 3311 3312 double r = rand(); 3313 t = (int)(RIP_TRIG_INT6_MIN + 3314 (RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX)); 3315 sup_trig_update = time(NULL) + t; 3316 return t; 3317 } 3318 3319 void 3320 #ifdef __STDC__ 3321 fatal(const char *fmt, ...) 3322 #else 3323 fatal(fmt, va_alist) 3324 char *fmt; 3325 va_dcl 3326 #endif 3327 { 3328 va_list ap; 3329 char buf[1024]; 3330 3331 #ifdef __STDC__ 3332 va_start(ap, fmt); 3333 #else 3334 va_start(ap); 3335 #endif 3336 vsnprintf(buf, sizeof(buf), fmt, ap); 3337 va_end(ap); 3338 perror(buf); 3339 syslog(LOG_ERR, "%s: %s", buf, strerror(errno)); 3340 rtdexit(); 3341 } 3342 3343 void 3344 #ifdef __STDC__ 3345 tracet(int level, const char *fmt, ...) 3346 #else 3347 tracet(level, fmt, va_alist) 3348 int level; 3349 char *fmt; 3350 va_dcl 3351 #endif 3352 { 3353 va_list ap; 3354 3355 if (level <= dflag) { 3356 #ifdef __STDC__ 3357 va_start(ap, fmt); 3358 #else 3359 va_start(ap); 3360 #endif 3361 fprintf(stderr, "%s: ", hms()); 3362 vfprintf(stderr, fmt, ap); 3363 va_end(ap); 3364 } 3365 if (dflag) { 3366 #ifdef __STDC__ 3367 va_start(ap, fmt); 3368 #else 3369 va_start(ap); 3370 #endif 3371 if (level > 0) 3372 vsyslog(LOG_DEBUG, fmt, ap); 3373 else 3374 vsyslog(LOG_WARNING, fmt, ap); 3375 va_end(ap); 3376 } 3377 } 3378 3379 void 3380 #ifdef __STDC__ 3381 trace(int level, const char *fmt, ...) 3382 #else 3383 trace(level, fmt, va_alist) 3384 int level; 3385 char *fmt; 3386 va_dcl 3387 #endif 3388 { 3389 va_list ap; 3390 3391 if (level <= dflag) { 3392 #ifdef __STDC__ 3393 va_start(ap, fmt); 3394 #else 3395 va_start(ap); 3396 #endif 3397 vfprintf(stderr, fmt, ap); 3398 va_end(ap); 3399 } 3400 if (dflag) { 3401 #ifdef __STDC__ 3402 va_start(ap, fmt); 3403 #else 3404 va_start(ap); 3405 #endif 3406 if (level > 0) 3407 vsyslog(LOG_DEBUG, fmt, ap); 3408 else 3409 vsyslog(LOG_WARNING, fmt, ap); 3410 va_end(ap); 3411 } 3412 } 3413 3414 unsigned int 3415 if_maxindex() 3416 { 3417 struct if_nameindex *p, *p0; 3418 unsigned int max = 0; 3419 3420 p0 = if_nameindex(); 3421 for (p = p0; p && p->if_index && p->if_name; p++) { 3422 if (max < p->if_index) 3423 max = p->if_index; 3424 } 3425 if_freenameindex(p0); 3426 return max; 3427 } 3428 3429 struct ifc * 3430 ifc_find(name) 3431 char *name; 3432 { 3433 struct ifc *ifcp; 3434 3435 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 3436 if (strcmp(name, ifcp->ifc_name) == 0) 3437 return ifcp; 3438 } 3439 return (struct ifc *)NULL; 3440 } 3441 3442 struct iff * 3443 iff_find(ifcp, type) 3444 struct ifc *ifcp; 3445 int type; 3446 { 3447 struct iff *iffp; 3448 3449 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 3450 if (iffp->iff_type == type) 3451 return iffp; 3452 } 3453 return NULL; 3454 } 3455 3456 void 3457 setindex2ifc(idx, ifcp) 3458 int idx; 3459 struct ifc *ifcp; 3460 { 3461 int n; 3462 struct ifc **p; 3463 3464 if (!index2ifc) { 3465 nindex2ifc = 5; /*initial guess*/ 3466 index2ifc = (struct ifc **) 3467 malloc(sizeof(*index2ifc) * nindex2ifc); 3468 if (index2ifc == NULL) { 3469 fatal("malloc"); 3470 /*NOTREACHED*/ 3471 } 3472 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc); 3473 } 3474 n = nindex2ifc; 3475 while (nindex2ifc <= idx) 3476 nindex2ifc *= 2; 3477 if (n != nindex2ifc) { 3478 p = (struct ifc **)realloc(index2ifc, 3479 sizeof(*index2ifc) * nindex2ifc); 3480 if (p == NULL) { 3481 fatal("realloc"); 3482 /*NOTREACHED*/ 3483 } 3484 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n)); 3485 index2ifc = p; 3486 } 3487 index2ifc[idx] = ifcp; 3488 } 3489
Indexes created Wed Oct 22 06:10:02 GMT 2025