1 /* $FreeBSD: src/usr.sbin/route6d/route6d.c,v 1.2.2.5 2001/07/03 11:02:09 ume Exp $ */ 2 /* $DragonFly: src/usr.sbin/route6d/route6d.c,v 1.2 2003/06/17 04:30:02 dillon Exp $ */ 3 /* $KAME: route6d.c,v 1.64 2001/05/08 04:36:37 itojun Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $KAME: route6d.c,v 1.64 2001/05/08 04:36:37 itojun Exp $ 34 */ 35 36 #include <stdio.h> 37 38 #include <time.h> 39 #include <unistd.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <signal.h> 43 #ifdef __STDC__ 44 #include <stdarg.h> 45 #else 46 #include <varargs.h> 47 #endif 48 #include <syslog.h> 49 #include <stddef.h> 50 #include <errno.h> 51 #include <err.h> 52 53 #include <sys/types.h> 54 #include <sys/param.h> 55 #include <sys/file.h> 56 #include <sys/socket.h> 57 #include <sys/ioctl.h> 58 #include <sys/sysctl.h> 59 #include <sys/uio.h> 60 #include <net/if.h> 61 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 62 #include <net/if_var.h> 63 #endif /* __FreeBSD__ >= 3 */ 64 #define KERNEL 1 65 #define _KERNEL 1 66 #include <net/route.h> 67 #undef KERNEL 68 #undef _KERNEL 69 #include <netinet/in.h> 70 #include <netinet/in_var.h> 71 #include <netinet/ip6.h> 72 #include <netinet/udp.h> 73 #include <netdb.h> 74 #include <ifaddrs.h> 75 76 #include <arpa/inet.h> 77 78 #include "route6d.h" 79 80 #define MAXFILTER 40 81 82 #ifdef DEBUG 83 #define INIT_INTERVAL6 6 84 #else 85 #define INIT_INTERVAL6 10 /* Wait to submit a initial riprequest */ 86 #endif 87 88 /* alignment constraint for routing socket */ 89 #define ROUNDUP(a) \ 90 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 91 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 92 93 /* 94 * Following two macros are highly depending on KAME Release 95 */ 96 #define IN6_LINKLOCAL_IFINDEX(addr) \ 97 ((addr).s6_addr[2] << 8 | (addr).s6_addr[3]) 98 99 #define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \ 100 do { \ 101 (addr).s6_addr[2] = ((index) >> 8) & 0xff; \ 102 (addr).s6_addr[3] = (index) & 0xff; \ 103 } while (0) 104 105 struct ifc { /* Configuration of an interface */ 106 char *ifc_name; /* if name */ 107 struct ifc *ifc_next; 108 int ifc_index; /* if index */ 109 int ifc_mtu; /* if mtu */ 110 int ifc_metric; /* if metric */ 111 u_int ifc_flags; /* flags */ 112 short ifc_cflags; /* IFC_XXX */ 113 struct in6_addr ifc_mylladdr; /* my link-local address */ 114 struct sockaddr_in6 ifc_ripsin; /* rip multicast address */ 115 struct iff *ifc_filter; /* filter structure */ 116 struct ifac *ifc_addr; /* list of AF_INET6 addresses */ 117 int ifc_joined; /* joined to ff02::9 */ 118 }; 119 120 struct ifac { /* Adddress associated to an interface */ 121 struct ifc *ifa_conf; /* back pointer */ 122 struct ifac *ifa_next; 123 struct in6_addr ifa_addr; /* address */ 124 struct in6_addr ifa_raddr; /* remote address, valid in p2p */ 125 int ifa_plen; /* prefix length */ 126 }; 127 128 struct iff { 129 int iff_type; 130 struct in6_addr iff_addr; 131 int iff_plen; 132 struct iff *iff_next; 133 }; 134 135 struct ifc *ifc; 136 int nifc; /* number of valid ifc's */ 137 struct ifc **index2ifc; 138 int nindex2ifc; 139 struct ifc *loopifcp = NULL; /* pointing to loopback */ 140 int loopifindex = 0; /* ditto */ 141 fd_set sockvec; /* vector to select() for receiving */ 142 int rtsock; /* the routing socket */ 143 int ripsock; /* socket to send/receive RIP datagram */ 144 145 struct rip6 *ripbuf; /* packet buffer for sending */ 146 147 /* 148 * Maintain the routes in a linked list. When the number of the routes 149 * grows, somebody would like to introduce a hash based or a radix tree 150 * based structure. I believe the number of routes handled by RIP is 151 * limited and I don't have to manage a complex data structure, however. 152 * 153 * One of the major drawbacks of the linear linked list is the difficulty 154 * of representing the relationship between a couple of routes. This may 155 * be a significant problem when we have to support route aggregation with 156 * supressing the specifices covered by the aggregate. 157 */ 158 159 struct riprt { 160 struct riprt *rrt_next; /* next destination */ 161 struct riprt *rrt_same; /* same destination - future use */ 162 struct netinfo6 rrt_info; /* network info */ 163 struct in6_addr rrt_gw; /* gateway */ 164 u_long rrt_flags; /* kernel routing table flags */ 165 u_long rrt_rflags; /* route6d routing table flags */ 166 time_t rrt_t; /* when the route validated */ 167 int rrt_index; /* ifindex from which this route got */ 168 }; 169 170 struct riprt *riprt = 0; 171 172 int dflag = 0; /* debug flag */ 173 int qflag = 0; /* quiet flag */ 174 int nflag = 0; /* don't update kernel routing table */ 175 int aflag = 0; /* age out even the statically defined routes */ 176 int hflag = 0; /* don't split horizon */ 177 int lflag = 0; /* exchange site local routes */ 178 int sflag = 0; /* announce static routes w/ split horizon */ 179 int Sflag = 0; /* announce static routes to every interface */ 180 unsigned long routetag = 0; /* route tag attached on originating case */ 181 182 char *filter[MAXFILTER]; 183 int filtertype[MAXFILTER]; 184 int nfilter = 0; 185 186 pid_t pid; 187 188 struct sockaddr_storage ripsin; 189 190 struct rtentry rtentry; 191 192 int interval = 1; 193 time_t nextalarm = 0; 194 time_t sup_trig_update = 0; 195 196 FILE *rtlog = NULL; 197 198 int logopened = 0; 199 200 static u_long seq = 0; 201 202 volatile int signo; 203 volatile sig_atomic_t seenalrm; 204 volatile sig_atomic_t seenquit; 205 volatile sig_atomic_t seenusr1; 206 207 #define RRTF_AGGREGATE 0x08000000 208 #define RRTF_NOADVERTISE 0x10000000 209 #define RRTF_NH_NOT_LLADDR 0x20000000 210 #define RRTF_SENDANYWAY 0x40000000 211 #define RRTF_CHANGED 0x80000000 212 213 int main __P((int, char **)); 214 void sighandler __P((int)); 215 void ripalarm __P((void)); 216 void riprecv __P((void)); 217 void ripsend __P((struct ifc *, struct sockaddr_in6 *, int)); 218 int out_filter __P((struct riprt *, struct ifc *)); 219 void init __P((void)); 220 void sockopt __P((struct ifc *)); 221 void ifconfig __P((void)); 222 void ifconfig1 __P((const char *, const struct sockaddr *, struct ifc *, int)); 223 void rtrecv __P((void)); 224 int rt_del __P((const struct sockaddr_in6 *, const struct sockaddr_in6 *, 225 const struct sockaddr_in6 *)); 226 int rt_deladdr __P((struct ifc *, const struct sockaddr_in6 *, 227 const struct sockaddr_in6 *)); 228 void filterconfig __P((void)); 229 int getifmtu __P((int)); 230 const char *rttypes __P((struct rt_msghdr *)); 231 const char *rtflags __P((struct rt_msghdr *)); 232 const char *ifflags __P((int)); 233 int ifrt __P((struct ifc *, int)); 234 void ifrt_p2p __P((struct ifc *, int)); 235 void applymask __P((struct in6_addr *, struct in6_addr *)); 236 void applyplen __P((struct in6_addr *, int)); 237 void ifrtdump __P((int)); 238 void ifdump __P((int)); 239 void ifdump0 __P((FILE *, const struct ifc *)); 240 void rtdump __P((int)); 241 void rt_entry __P((struct rt_msghdr *, int)); 242 void rtdexit __P((void)); 243 void riprequest __P((struct ifc *, struct netinfo6 *, int, 244 struct sockaddr_in6 *)); 245 void ripflush __P((struct ifc *, struct sockaddr_in6 *)); 246 void sendrequest __P((struct ifc *)); 247 int sin6mask2len __P((const struct sockaddr_in6 *)); 248 int mask2len __P((const struct in6_addr *, int)); 249 int sendpacket __P((struct sockaddr_in6 *, int)); 250 int addroute __P((struct riprt *, const struct in6_addr *, struct ifc *)); 251 int delroute __P((struct netinfo6 *, struct in6_addr *)); 252 struct in6_addr *getroute __P((struct netinfo6 *, struct in6_addr *)); 253 void krtread __P((int)); 254 int tobeadv __P((struct riprt *, struct ifc *)); 255 char *allocopy __P((char *)); 256 char *hms __P((void)); 257 const char *inet6_n2p __P((const struct in6_addr *)); 258 struct ifac *ifa_match __P((const struct ifc *, const struct in6_addr *, int)); 259 struct in6_addr *plen2mask __P((int)); 260 struct riprt *rtsearch __P((struct netinfo6 *, struct riprt **)); 261 int ripinterval __P((int)); 262 time_t ripsuptrig __P((void)); 263 void fatal __P((const char *, ...)) 264 __attribute__((__format__(__printf__, 1, 2))); 265 void trace __P((int, const char *, ...)) 266 __attribute__((__format__(__printf__, 2, 3))); 267 void tracet __P((int, const char *, ...)) 268 __attribute__((__format__(__printf__, 2, 3))); 269 unsigned int if_maxindex __P((void)); 270 struct ifc *ifc_find __P((char *)); 271 struct iff *iff_find __P((struct ifc *, int)); 272 void setindex2ifc __P((int, struct ifc *)); 273 274 #define MALLOC(type) ((type *)malloc(sizeof(type))) 275 276 int 277 main(argc, argv) 278 int argc; 279 char **argv; 280 { 281 int ch; 282 int error = 0; 283 struct ifc *ifcp; 284 sigset_t mask, omask; 285 FILE *pidfile; 286 char *progname; 287 char *ep; 288 289 progname = strrchr(*argv, '/'); 290 if (progname) 291 progname++; 292 else 293 progname = *argv; 294 295 pid = getpid(); 296 while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) { 297 switch (ch) { 298 case 'A': 299 case 'N': 300 case 'O': 301 case 'T': 302 case 'L': 303 if (nfilter >= MAXFILTER) { 304 fatal("Exceeds MAXFILTER"); 305 /*NOTREACHED*/ 306 } 307 filtertype[nfilter] = ch; 308 filter[nfilter++] = allocopy(optarg); 309 break; 310 case 't': 311 ep = NULL; 312 routetag = strtoul(optarg, &ep, 0); 313 if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) { 314 fatal("invalid route tag"); 315 /*NOTREACHED*/ 316 } 317 break; 318 case 'R': 319 if ((rtlog = fopen(optarg, "w")) == NULL) { 320 fatal("Can not write to routelog"); 321 /*NOTREACHED*/ 322 } 323 break; 324 #define FLAG(c, flag, n) case c: do { flag = n; break; } while(0) 325 FLAG('a', aflag, 1); break; 326 FLAG('d', dflag, 1); break; 327 FLAG('D', dflag, 2); break; 328 FLAG('h', hflag, 1); break; 329 FLAG('l', lflag, 1); break; 330 FLAG('n', nflag, 1); break; 331 FLAG('q', qflag, 1); break; 332 FLAG('s', sflag, 1); break; 333 FLAG('S', Sflag, 1); break; 334 #undef FLAG 335 default: 336 fatal("Invalid option specified, terminating"); 337 /*NOTREACHED*/ 338 } 339 } 340 argc -= optind; 341 argv += optind; 342 if (argc > 0) { 343 fatal("bogus extra arguments"); 344 /*NOTREACHED*/ 345 } 346 347 if (geteuid()) { 348 nflag = 1; 349 fprintf(stderr, "No kernel update is allowed\n"); 350 } 351 openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON); 352 logopened++; 353 354 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) 355 fatal("malloc"); 356 memset(ripbuf, 0, RIP6_MAXMTU); 357 ripbuf->rip6_cmd = RIP6_RESPONSE; 358 ripbuf->rip6_vers = RIP6_VERSION; 359 ripbuf->rip6_res1[0] = 0; 360 ripbuf->rip6_res1[1] = 0; 361 362 init(); 363 ifconfig(); 364 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 365 if (ifcp->ifc_index < 0) { 366 fprintf(stderr, 367 "No ifindex found at %s (no link-local address?)\n", 368 ifcp->ifc_name); 369 error++; 370 } 371 } 372 if (error) 373 exit(1); 374 if (loopifcp == NULL) { 375 fatal("No loopback found"); 376 /*NOTREACHED*/ 377 } 378 loopifindex = loopifcp->ifc_index; 379 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 380 ifrt(ifcp, 0); 381 filterconfig(); 382 krtread(0); 383 if (dflag) 384 ifrtdump(0); 385 386 if (dflag == 0) { 387 #if 1 388 if (daemon(0, 0) < 0) { 389 fatal("daemon"); 390 /*NOTREACHED*/ 391 } 392 #else 393 if (fork()) 394 exit(0); 395 if (setsid() < 0) { 396 fatal("setid"); 397 /*NOTREACHED*/ 398 } 399 #endif 400 } 401 pid = getpid(); 402 if ((pidfile = fopen(ROUTE6D_PID, "w")) != NULL) { 403 fprintf(pidfile, "%d\n", pid); 404 fclose(pidfile); 405 } 406 407 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) { 408 fatal("malloc"); 409 /*NOTREACHED*/ 410 } 411 memset(ripbuf, 0, RIP6_MAXMTU); 412 ripbuf->rip6_cmd = RIP6_RESPONSE; 413 ripbuf->rip6_vers = RIP6_VERSION; 414 ripbuf->rip6_res1[0] = 0; 415 ripbuf->rip6_res1[1] = 0; 416 417 if (signal(SIGALRM, sighandler) == SIG_ERR || 418 signal(SIGQUIT, sighandler) == SIG_ERR || 419 signal(SIGTERM, sighandler) == SIG_ERR || 420 signal(SIGUSR1, sighandler) == SIG_ERR || 421 signal(SIGHUP, sighandler) == SIG_ERR || 422 signal(SIGINT, sighandler) == SIG_ERR) { 423 fatal("signal"); 424 /*NOTREACHED*/ 425 } 426 /* 427 * To avoid rip packet congestion (not on a cable but in this 428 * process), wait for a moment to send the first RIP6_RESPONSE 429 * packets. 430 */ 431 alarm(ripinterval(INIT_INTERVAL6)); 432 433 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 434 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 435 sendrequest(ifcp); 436 } 437 438 syslog(LOG_INFO, "**** Started ****"); 439 sigemptyset(&mask); 440 sigaddset(&mask, SIGALRM); 441 while (1) { 442 fd_set recvec; 443 444 if (seenalrm) { 445 ripalarm(); 446 seenalrm = 0; 447 continue; 448 } 449 if (seenquit) { 450 rtdexit(); 451 seenquit = 0; 452 continue; 453 } 454 if (seenusr1) { 455 ifrtdump(SIGUSR1); 456 seenusr1 = 0; 457 continue; 458 } 459 460 FD_COPY(&sockvec, &recvec); 461 signo = 0; 462 switch (select(FD_SETSIZE, &recvec, 0, 0, 0)) { 463 case -1: 464 if (errno != EINTR) { 465 fatal("select"); 466 /*NOTREACHED*/ 467 } 468 continue; 469 case 0: 470 continue; 471 default: 472 if (FD_ISSET(ripsock, &recvec)) { 473 sigprocmask(SIG_BLOCK, &mask, &omask); 474 riprecv(); 475 sigprocmask(SIG_SETMASK, &omask, NULL); 476 } 477 if (FD_ISSET(rtsock, &recvec)) { 478 sigprocmask(SIG_BLOCK, &mask, &omask); 479 rtrecv(); 480 sigprocmask(SIG_SETMASK, &omask, NULL); 481 } 482 } 483 } 484 } 485 486 void 487 sighandler(sig) 488 int sig; 489 { 490 491 signo = sig; 492 switch (signo) { 493 case SIGALRM: 494 seenalrm++; 495 break; 496 case SIGQUIT: 497 case SIGTERM: 498 seenquit++; 499 break; 500 case SIGUSR1: 501 case SIGHUP: 502 case SIGINT: 503 seenusr1++; 504 break; 505 } 506 } 507 508 /* 509 * gracefully exits after resetting sockopts. 510 */ 511 /* ARGSUSED */ 512 void 513 rtdexit() 514 { 515 struct riprt *rrt; 516 517 alarm(0); 518 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 519 if (rrt->rrt_rflags & RRTF_AGGREGATE) { 520 delroute(&rrt->rrt_info, &rrt->rrt_gw); 521 } 522 } 523 close(ripsock); 524 close(rtsock); 525 syslog(LOG_INFO, "**** Terminated ****"); 526 closelog(); 527 exit(1); 528 } 529 530 /* 531 * Called periodically: 532 * 1. age out the learned route. remove it if necessary. 533 * 2. submit RIP6_RESPONSE packets. 534 * Invoked in every SUPPLY_INTERVAL6 (30) seconds. I believe we don't have 535 * to invoke this function in every 1 or 5 or 10 seconds only to age the 536 * routes more precisely. 537 */ 538 /* ARGSUSED */ 539 void 540 ripalarm() 541 { 542 struct ifc *ifcp; 543 struct riprt *rrt, *rrt_prev, *rrt_next; 544 time_t t_lifetime, t_holddown; 545 546 /* age the RIP routes */ 547 rrt_prev = 0; 548 t_lifetime = time(NULL) - RIP_LIFETIME; 549 t_holddown = t_lifetime - RIP_HOLDDOWN; 550 for (rrt = riprt; rrt; rrt = rrt_next) { 551 rrt_next = rrt->rrt_next; 552 553 if (rrt->rrt_t == 0) { 554 rrt_prev = rrt; 555 continue; 556 } 557 if (rrt->rrt_t < t_holddown) { 558 if (rrt_prev) { 559 rrt_prev->rrt_next = rrt->rrt_next; 560 } else { 561 riprt = rrt->rrt_next; 562 } 563 delroute(&rrt->rrt_info, &rrt->rrt_gw); 564 free(rrt); 565 continue; 566 } 567 if (rrt->rrt_t < t_lifetime) 568 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 569 rrt_prev = rrt; 570 } 571 /* Supply updates */ 572 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 573 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 574 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 575 } 576 alarm(ripinterval(SUPPLY_INTERVAL6)); 577 } 578 579 void 580 init() 581 { 582 int i, int0, int255, error; 583 struct addrinfo hints, *res; 584 char port[10]; 585 586 ifc = (struct ifc *)NULL; 587 nifc = 0; 588 nindex2ifc = 0; /*initial guess*/ 589 index2ifc = NULL; 590 snprintf(port, sizeof(port), "%d", RIP6_PORT); 591 592 memset(&hints, 0, sizeof(hints)); 593 hints.ai_family = PF_INET6; 594 hints.ai_socktype = SOCK_DGRAM; 595 hints.ai_flags = AI_PASSIVE; 596 error = getaddrinfo(NULL, port, &hints, &res); 597 if (error) { 598 fatal("%s", gai_strerror(error)); 599 /*NOTREACHED*/ 600 } 601 if (res->ai_next) { 602 fatal(":: resolved to multiple address"); 603 /*NOTREACHED*/ 604 } 605 606 int0 = 0; int255 = 255; 607 ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 608 if (ripsock < 0) { 609 fatal("rip socket"); 610 /*NOTREACHED*/ 611 } 612 if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) { 613 fatal("rip bind"); 614 /*NOTREACHED*/ 615 } 616 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 617 &int255, sizeof(int255)) < 0) { 618 fatal("rip IPV6_MULTICAST_HOPS"); 619 /*NOTREACHED*/ 620 } 621 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, 622 &int0, sizeof(int0)) < 0) { 623 fatal("rip IPV6_MULTICAST_LOOP"); 624 /*NOTREACHED*/ 625 } 626 627 i = 1; 628 #ifdef IPV6_RECVPKTINFO 629 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i, 630 sizeof(i)) < 0) { 631 fatal("rip IPV6_RECVPKTINFO"); 632 /*NOTREACHED*/ 633 } 634 #else /* old adv. API */ 635 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, &i, 636 sizeof(i)) < 0) { 637 fatal("rip IPV6_PKTINFO"); 638 /*NOTREACHED*/ 639 } 640 #endif 641 642 memset(&hints, 0, sizeof(hints)); 643 hints.ai_family = PF_INET6; 644 hints.ai_socktype = SOCK_DGRAM; 645 error = getaddrinfo(RIP6_DEST, port, &hints, &res); 646 if (error) { 647 fatal("%s", gai_strerror(error)); 648 /*NOTREACHED*/ 649 } 650 if (res->ai_next) { 651 fatal("%s resolved to multiple address", RIP6_DEST); 652 /*NOTREACHED*/ 653 } 654 memcpy(&ripsin, res->ai_addr, res->ai_addrlen); 655 656 #ifdef FD_ZERO 657 FD_ZERO(&sockvec); 658 #else 659 memset(&sockvec, 0, sizeof(sockvec)); 660 #endif 661 FD_SET(ripsock, &sockvec); 662 663 if (nflag == 0) { 664 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) { 665 fatal("route socket"); 666 /*NOTREACHED*/ 667 } 668 FD_SET(rtsock, &sockvec); 669 } else 670 rtsock = -1; /*just for safety */ 671 } 672 673 #define RIPSIZE(n) \ 674 (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6)) 675 676 /* 677 * ripflush flushes the rip datagram stored in the rip buffer 678 */ 679 static int nrt; 680 static struct netinfo6 *np; 681 682 void 683 ripflush(ifcp, sin) 684 struct ifc *ifcp; 685 struct sockaddr_in6 *sin; 686 { 687 int i; 688 int error; 689 690 if (ifcp) 691 tracet(1, "Send(%s): info(%d) to %s.%d\n", 692 ifcp->ifc_name, nrt, 693 inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port)); 694 else 695 tracet(1, "Send: info(%d) to %s.%d\n", 696 nrt, inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port)); 697 if (dflag >= 2) { 698 np = ripbuf->rip6_nets; 699 for (i = 0; i < nrt; i++, np++) { 700 if (np->rip6_metric == NEXTHOP_METRIC) { 701 if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) 702 trace(2, " NextHop reset"); 703 else { 704 trace(2, " NextHop %s", 705 inet6_n2p(&np->rip6_dest)); 706 } 707 } else { 708 trace(2, " %s/%d[%d]", 709 inet6_n2p(&np->rip6_dest), 710 np->rip6_plen, np->rip6_metric); 711 } 712 if (np->rip6_tag) { 713 trace(2, " tag=0x%04x", 714 ntohs(np->rip6_tag) & 0xffff); 715 } 716 trace(2, "\n"); 717 } 718 } 719 error = sendpacket(sin, RIPSIZE(nrt)); 720 if (error == EAFNOSUPPORT) { 721 /* Protocol not supported */ 722 tracet(1, "Could not send info to %s (%s): " 723 "set IFF_UP to 0\n", 724 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 725 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 726 } 727 nrt = 0; np = ripbuf->rip6_nets; 728 } 729 730 /* 731 * Generate RIP6_RESPONSE packets and send them. 732 */ 733 void 734 ripsend(ifcp, sin, flag) 735 struct ifc *ifcp; 736 struct sockaddr_in6 *sin; 737 int flag; 738 { 739 struct riprt *rrt; 740 struct in6_addr *nh; /* next hop */ 741 int maxrte; 742 743 if (ifcp == NULL) { 744 /* 745 * Request from non-link local address is not 746 * a regular route6d update. 747 */ 748 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) - 749 sizeof(struct udphdr) - 750 sizeof(struct rip6) + sizeof(struct netinfo6)) / 751 sizeof(struct netinfo6); 752 nrt = 0; np = ripbuf->rip6_nets; nh = NULL; 753 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 754 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 755 continue; 756 /* Put the route to the buffer */ 757 *np = rrt->rrt_info; 758 np++; nrt++; 759 if (nrt == maxrte) { 760 ripflush(NULL, sin); 761 nh = NULL; 762 } 763 } 764 if (nrt) /* Send last packet */ 765 ripflush(NULL, sin); 766 return; 767 } 768 769 if ((flag & RRTF_SENDANYWAY) == 0 && 770 (qflag || (ifcp->ifc_flags & IFF_LOOPBACK))) 771 return; 772 773 /* -N: no use */ 774 if (iff_find(ifcp, 'N') != NULL) 775 return; 776 777 /* -T: generate default route only */ 778 if (iff_find(ifcp, 'T') != NULL) { 779 struct netinfo6 rrt_info; 780 memset(&rrt_info, 0, sizeof(struct netinfo6)); 781 rrt_info.rip6_dest = in6addr_any; 782 rrt_info.rip6_plen = 0; 783 rrt_info.rip6_metric = 1; 784 rrt_info.rip6_metric += ifcp->ifc_metric; 785 rrt_info.rip6_tag = htons(routetag & 0xffff); 786 np = ripbuf->rip6_nets; 787 *np = rrt_info; 788 nrt = 1; 789 ripflush(ifcp, sin); 790 return; 791 } 792 793 maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) - 794 sizeof(struct udphdr) - 795 sizeof(struct rip6) + sizeof(struct netinfo6)) / 796 sizeof(struct netinfo6); 797 798 nrt = 0; np = ripbuf->rip6_nets; nh = NULL; 799 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 800 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 801 continue; 802 803 /* Need to check filter here */ 804 if (out_filter(rrt, ifcp) == 0) 805 continue; 806 807 /* Check split horizon and other conditions */ 808 if (tobeadv(rrt, ifcp) == 0) 809 continue; 810 811 /* Only considers the routes with flag if specified */ 812 if ((flag & RRTF_CHANGED) && 813 (rrt->rrt_rflags & RRTF_CHANGED) == 0) 814 continue; 815 816 /* Check nexthop */ 817 if (rrt->rrt_index == ifcp->ifc_index && 818 !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) && 819 (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) { 820 if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) { 821 if (nrt == maxrte - 2) 822 ripflush(ifcp, sin); 823 np->rip6_dest = rrt->rrt_gw; 824 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) 825 SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0); 826 np->rip6_plen = 0; 827 np->rip6_tag = 0; 828 np->rip6_metric = NEXTHOP_METRIC; 829 nh = &rrt->rrt_gw; 830 np++; nrt++; 831 } 832 } else if (nh && (rrt->rrt_index != ifcp->ifc_index || 833 !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) || 834 rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) { 835 /* Reset nexthop */ 836 if (nrt == maxrte - 2) 837 ripflush(ifcp, sin); 838 memset(np, 0, sizeof(struct netinfo6)); 839 np->rip6_metric = NEXTHOP_METRIC; 840 nh = NULL; 841 np++; nrt++; 842 } 843 844 /* Put the route to the buffer */ 845 *np = rrt->rrt_info; 846 np++; nrt++; 847 if (nrt == maxrte) { 848 ripflush(ifcp, sin); 849 nh = NULL; 850 } 851 } 852 if (nrt) /* Send last packet */ 853 ripflush(ifcp, sin); 854 } 855 856 /* 857 * outbound filter logic, per-route/interface. 858 */ 859 int 860 out_filter(rrt, ifcp) 861 struct riprt *rrt; 862 struct ifc *ifcp; 863 { 864 struct iff *iffp; 865 struct in6_addr ia; 866 int ok; 867 868 /* 869 * -A: filter out less specific routes, if we have aggregated 870 * route configured. 871 */ 872 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 873 if (iffp->iff_type != 'A') 874 continue; 875 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen) 876 continue; 877 ia = rrt->rrt_info.rip6_dest; 878 applyplen(&ia, iffp->iff_plen); 879 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) 880 return 0; 881 } 882 883 /* 884 * if it is an aggregated route, advertise it only to the 885 * interfaces specified on -A. 886 */ 887 if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) { 888 ok = 0; 889 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 890 if (iffp->iff_type != 'A') 891 continue; 892 if (rrt->rrt_info.rip6_plen == iffp->iff_plen && 893 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 894 &iffp->iff_addr)) { 895 ok = 1; 896 break; 897 } 898 } 899 if (!ok) 900 return 0; 901 } 902 903 /* 904 * -O: advertise only if prefix matches the configured prefix. 905 */ 906 if (iff_find(ifcp, 'O')) { 907 ok = 0; 908 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 909 if (iffp->iff_type != 'O') 910 continue; 911 if (rrt->rrt_info.rip6_plen < iffp->iff_plen) 912 continue; 913 ia = rrt->rrt_info.rip6_dest; 914 applyplen(&ia, iffp->iff_plen); 915 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 916 ok = 1; 917 break; 918 } 919 } 920 if (!ok) 921 return 0; 922 } 923 924 /* the prefix should be advertised */ 925 return 1; 926 } 927 928 /* 929 * Determine if the route is to be advertised on the specified interface. 930 * It checks options specified in the arguments and the split horizon rule. 931 */ 932 int 933 tobeadv(rrt, ifcp) 934 struct riprt *rrt; 935 struct ifc *ifcp; 936 { 937 938 /* Special care for static routes */ 939 if (rrt->rrt_flags & RTF_STATIC) { 940 /* XXX don't advertise reject/blackhole routes */ 941 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE)) 942 return 0; 943 944 if (Sflag) /* Yes, advertise it anyway */ 945 return 1; 946 if (sflag && rrt->rrt_index != ifcp->ifc_index) 947 return 1; 948 return 0; 949 } 950 /* Regular split horizon */ 951 if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index) 952 return 0; 953 return 1; 954 } 955 956 /* 957 * Send a rip packet actually. 958 */ 959 int 960 sendpacket(sin, len) 961 struct sockaddr_in6 *sin; 962 int len; 963 { 964 /* 965 * MSG_DONTROUTE should not be specified when it responds with a 966 * RIP6_REQUEST message. SO_DONTROUTE has been specified to 967 * other sockets. 968 */ 969 struct msghdr m; 970 struct cmsghdr *cm; 971 struct iovec iov[2]; 972 u_char cmsgbuf[256]; 973 struct in6_pktinfo *pi; 974 int idx; 975 struct sockaddr_in6 sincopy; 976 977 /* do not overwrite the given sin */ 978 sincopy = *sin; 979 sin = &sincopy; 980 981 if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr) 982 || IN6_IS_ADDR_MULTICAST(&sin->sin6_addr)) { 983 idx = IN6_LINKLOCAL_IFINDEX(sin->sin6_addr); 984 SET_IN6_LINKLOCAL_IFINDEX(sin->sin6_addr, 0); 985 } else 986 idx = 0; 987 988 m.msg_name = (caddr_t)sin; 989 m.msg_namelen = sizeof(*sin); 990 iov[0].iov_base = (caddr_t)ripbuf; 991 iov[0].iov_len = len; 992 m.msg_iov = iov; 993 m.msg_iovlen = 1; 994 if (!idx) { 995 m.msg_control = NULL; 996 m.msg_controllen = 0; 997 } else { 998 memset(cmsgbuf, 0, sizeof(cmsgbuf)); 999 cm = (struct cmsghdr *)cmsgbuf; 1000 m.msg_control = (caddr_t)cm; 1001 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); 1002 1003 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 1004 cm->cmsg_level = IPPROTO_IPV6; 1005 cm->cmsg_type = IPV6_PKTINFO; 1006 pi = (struct in6_pktinfo *)CMSG_DATA(cm); 1007 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/ 1008 pi->ipi6_ifindex = idx; 1009 } 1010 1011 if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) { 1012 trace(1, "sendmsg: %s\n", strerror(errno)); 1013 return errno; 1014 } 1015 1016 return 0; 1017 } 1018 1019 /* 1020 * Receive and process RIP packets. Update the routes/kernel forwarding 1021 * table if necessary. 1022 */ 1023 void 1024 riprecv() 1025 { 1026 struct ifc *ifcp, *ic; 1027 struct sockaddr_in6 fsock; 1028 struct in6_addr nh; /* next hop */ 1029 struct rip6 *rp; 1030 struct netinfo6 *np, *nq; 1031 struct riprt *rrt; 1032 int len, nn, need_trigger, idx; 1033 char buf[4 * RIP6_MAXMTU]; 1034 time_t t; 1035 struct msghdr m; 1036 struct cmsghdr *cm; 1037 struct iovec iov[2]; 1038 u_char cmsgbuf[256]; 1039 struct in6_pktinfo *pi; 1040 struct iff *iffp; 1041 struct in6_addr ia; 1042 int ok; 1043 time_t t_half_lifetime; 1044 1045 need_trigger = 0; 1046 1047 m.msg_name = (caddr_t)&fsock; 1048 m.msg_namelen = sizeof(fsock); 1049 iov[0].iov_base = (caddr_t)buf; 1050 iov[0].iov_len = sizeof(buf); 1051 m.msg_iov = iov; 1052 m.msg_iovlen = 1; 1053 cm = (struct cmsghdr *)cmsgbuf; 1054 m.msg_control = (caddr_t)cm; 1055 m.msg_controllen = sizeof(cmsgbuf); 1056 if ((len = recvmsg(ripsock, &m, 0)) < 0) { 1057 fatal("recvmsg"); 1058 /*NOTREACHED*/ 1059 } 1060 idx = 0; 1061 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m); 1062 cm; 1063 cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) { 1064 if (cm->cmsg_level == IPPROTO_IPV6 && 1065 cm->cmsg_type == IPV6_PKTINFO) { 1066 pi = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1067 idx = pi->ipi6_ifindex; 1068 break; 1069 } 1070 } 1071 if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) 1072 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx); 1073 1074 nh = fsock.sin6_addr; 1075 nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) / 1076 sizeof(struct netinfo6); 1077 rp = (struct rip6 *)buf; 1078 np = rp->rip6_nets; 1079 1080 if (rp->rip6_vers != RIP6_VERSION) { 1081 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers); 1082 return; 1083 } 1084 if (rp->rip6_cmd == RIP6_REQUEST) { 1085 if (idx && idx < nindex2ifc) { 1086 ifcp = index2ifc[idx]; 1087 riprequest(ifcp, np, nn, &fsock); 1088 } else { 1089 riprequest(NULL, np, nn, &fsock); 1090 } 1091 return; 1092 } 1093 1094 if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) { 1095 trace(1, "Packets from non-ll addr: %s\n", 1096 inet6_n2p(&fsock.sin6_addr)); 1097 return; /* Ignore packets from non-link-local addr */ 1098 } 1099 idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr); 1100 ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL; 1101 if (!ifcp) { 1102 trace(1, "Packets to unknown interface index %d\n", idx); 1103 return; /* Ignore it */ 1104 } 1105 if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr)) 1106 return; /* The packet is from me; ignore */ 1107 if (rp->rip6_cmd != RIP6_RESPONSE) { 1108 trace(1, "Invalid command %d\n", rp->rip6_cmd); 1109 return; 1110 } 1111 1112 /* -N: no use */ 1113 if (iff_find(ifcp, 'N') != NULL) 1114 return; 1115 1116 tracet(1, "Recv(%s): from %s.%d info(%d)\n", 1117 ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn); 1118 1119 t = time(NULL); 1120 t_half_lifetime = t - (RIP_LIFETIME/2); 1121 for (; nn; nn--, np++) { 1122 if (np->rip6_metric == NEXTHOP_METRIC) { 1123 /* modify neighbor address */ 1124 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1125 nh = np->rip6_dest; 1126 SET_IN6_LINKLOCAL_IFINDEX(nh, idx); 1127 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1128 } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) { 1129 nh = fsock.sin6_addr; 1130 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1131 } else { 1132 nh = fsock.sin6_addr; 1133 trace(1, "\tInvalid Nexthop: %s\n", 1134 inet6_n2p(&np->rip6_dest)); 1135 } 1136 continue; 1137 } 1138 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) { 1139 trace(1, "\tMulticast netinfo6: %s/%d [%d]\n", 1140 inet6_n2p(&np->rip6_dest), 1141 np->rip6_plen, np->rip6_metric); 1142 continue; 1143 } 1144 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) { 1145 trace(1, "\tLoopback netinfo6: %s/%d [%d]\n", 1146 inet6_n2p(&np->rip6_dest), 1147 np->rip6_plen, np->rip6_metric); 1148 continue; 1149 } 1150 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1151 trace(1, "\tLink Local netinfo6: %s/%d [%d]\n", 1152 inet6_n2p(&np->rip6_dest), 1153 np->rip6_plen, np->rip6_metric); 1154 continue; 1155 } 1156 /* may need to pass sitelocal prefix in some case, however*/ 1157 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) { 1158 trace(1, "\tSite Local netinfo6: %s/%d [%d]\n", 1159 inet6_n2p(&np->rip6_dest), 1160 np->rip6_plen, np->rip6_metric); 1161 continue; 1162 } 1163 trace(2, "\tnetinfo6: %s/%d [%d]", 1164 inet6_n2p(&np->rip6_dest), 1165 np->rip6_plen, np->rip6_metric); 1166 if (np->rip6_tag) 1167 trace(2, " tag=0x%04x", ntohs(np->rip6_tag) & 0xffff); 1168 if (dflag >= 2) { 1169 ia = np->rip6_dest; 1170 applyplen(&ia, np->rip6_plen); 1171 if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest)) 1172 trace(2, " [junk outside prefix]"); 1173 } 1174 1175 /* 1176 * -L: listen only if the prefix matches the configuration 1177 */ 1178 ok = 1; /* if there's no L filter, it is ok */ 1179 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 1180 if (iffp->iff_type != 'L') 1181 continue; 1182 ok = 0; 1183 if (np->rip6_plen < iffp->iff_plen) 1184 continue; 1185 /* special rule: ::/0 means default, not "in /0" */ 1186 if (iffp->iff_plen == 0 && np->rip6_plen > 0) 1187 continue; 1188 ia = np->rip6_dest; 1189 applyplen(&ia, iffp->iff_plen); 1190 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 1191 ok = 1; 1192 break; 1193 } 1194 } 1195 if (!ok) { 1196 trace(2, " (filtered)\n"); 1197 continue; 1198 } 1199 1200 trace(2, "\n"); 1201 np->rip6_metric++; 1202 np->rip6_metric += ifcp->ifc_metric; 1203 if (np->rip6_metric > HOPCNT_INFINITY6) 1204 np->rip6_metric = HOPCNT_INFINITY6; 1205 1206 applyplen(&np->rip6_dest, np->rip6_plen); 1207 if ((rrt = rtsearch(np, NULL)) != NULL) { 1208 if (rrt->rrt_t == 0) 1209 continue; /* Intf route has priority */ 1210 nq = &rrt->rrt_info; 1211 if (nq->rip6_metric > np->rip6_metric) { 1212 if (rrt->rrt_index == ifcp->ifc_index && 1213 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1214 /* Small metric from the same gateway */ 1215 nq->rip6_metric = np->rip6_metric; 1216 } else { 1217 /* Better route found */ 1218 rrt->rrt_index = ifcp->ifc_index; 1219 /* Update routing table */ 1220 delroute(nq, &rrt->rrt_gw); 1221 rrt->rrt_gw = nh; 1222 *nq = *np; 1223 addroute(rrt, &nh, ifcp); 1224 } 1225 rrt->rrt_rflags |= RRTF_CHANGED; 1226 rrt->rrt_t = t; 1227 need_trigger = 1; 1228 } else if (nq->rip6_metric < np->rip6_metric && 1229 rrt->rrt_index == ifcp->ifc_index && 1230 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1231 /* Got worse route from same gw */ 1232 nq->rip6_metric = np->rip6_metric; 1233 rrt->rrt_t = t; 1234 rrt->rrt_rflags |= RRTF_CHANGED; 1235 need_trigger = 1; 1236 } else if (nq->rip6_metric == np->rip6_metric && 1237 np->rip6_metric < HOPCNT_INFINITY6) { 1238 if (rrt->rrt_index == ifcp->ifc_index && 1239 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1240 /* same metric, same route from same gw */ 1241 rrt->rrt_t = t; 1242 } else if (rrt->rrt_t < t_half_lifetime) { 1243 /* Better route found */ 1244 rrt->rrt_index = ifcp->ifc_index; 1245 /* Update routing table */ 1246 delroute(nq, &rrt->rrt_gw); 1247 rrt->rrt_gw = nh; 1248 *nq = *np; 1249 addroute(rrt, &nh, ifcp); 1250 rrt->rrt_rflags |= RRTF_CHANGED; 1251 rrt->rrt_t = t; 1252 } 1253 } 1254 /* 1255 * if nq->rip6_metric == HOPCNT_INFINITY6 then 1256 * do not update age value. Do nothing. 1257 */ 1258 } else if (np->rip6_metric < HOPCNT_INFINITY6) { 1259 /* Got a new valid route */ 1260 if ((rrt = MALLOC(struct riprt)) == NULL) { 1261 fatal("malloc: struct riprt"); 1262 /*NOTREACHED*/ 1263 } 1264 memset(rrt, 0, sizeof(*rrt)); 1265 nq = &rrt->rrt_info; 1266 1267 rrt->rrt_same = NULL; 1268 rrt->rrt_index = ifcp->ifc_index; 1269 rrt->rrt_flags = RTF_UP|RTF_GATEWAY; 1270 rrt->rrt_gw = nh; 1271 *nq = *np; 1272 applyplen(&nq->rip6_dest, nq->rip6_plen); 1273 if (nq->rip6_plen == sizeof(struct in6_addr) * 8) 1274 rrt->rrt_flags |= RTF_HOST; 1275 1276 /* Put the route to the list */ 1277 rrt->rrt_next = riprt; 1278 riprt = rrt; 1279 /* Update routing table */ 1280 addroute(rrt, &nh, ifcp); 1281 rrt->rrt_rflags |= RRTF_CHANGED; 1282 need_trigger = 1; 1283 rrt->rrt_t = t; 1284 } 1285 } 1286 /* XXX need to care the interval between triggered updates */ 1287 if (need_trigger) { 1288 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) { 1289 for (ic = ifc; ic; ic = ic->ifc_next) { 1290 if (ifcp->ifc_index == ic->ifc_index) 1291 continue; 1292 if (ic->ifc_flags & IFF_UP) 1293 ripsend(ic, &ic->ifc_ripsin, 1294 RRTF_CHANGED); 1295 } 1296 } 1297 /* Reset the flag */ 1298 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1299 rrt->rrt_rflags &= ~RRTF_CHANGED; 1300 } 1301 } 1302 1303 /* 1304 * Send all routes request packet to the specified interface. 1305 */ 1306 void 1307 sendrequest(ifcp) 1308 struct ifc *ifcp; 1309 { 1310 struct netinfo6 *np; 1311 int error; 1312 1313 if (ifcp->ifc_flags & IFF_LOOPBACK) 1314 return; 1315 ripbuf->rip6_cmd = RIP6_REQUEST; 1316 np = ripbuf->rip6_nets; 1317 memset(np, 0, sizeof(struct netinfo6)); 1318 np->rip6_metric = HOPCNT_INFINITY6; 1319 tracet(1, "Send rtdump Request to %s (%s)\n", 1320 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1321 error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1)); 1322 if (error == EAFNOSUPPORT) { 1323 /* Protocol not supported */ 1324 tracet(1, "Could not send rtdump Request to %s (%s): " 1325 "set IFF_UP to 0\n", 1326 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1327 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 1328 } 1329 ripbuf->rip6_cmd = RIP6_RESPONSE; 1330 } 1331 1332 /* 1333 * Process a RIP6_REQUEST packet. 1334 */ 1335 void 1336 riprequest(ifcp, np, nn, sin) 1337 struct ifc *ifcp; 1338 struct netinfo6 *np; 1339 int nn; 1340 struct sockaddr_in6 *sin; 1341 { 1342 int i; 1343 struct riprt *rrt; 1344 1345 if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) && 1346 np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) { 1347 /* Specific response, don't split-horizon */ 1348 trace(1, "\tRIP Request\n"); 1349 for (i = 0; i < nn; i++, np++) { 1350 rrt = rtsearch(np, NULL); 1351 if (rrt) 1352 np->rip6_metric = rrt->rrt_info.rip6_metric; 1353 else 1354 np->rip6_metric = HOPCNT_INFINITY6; 1355 } 1356 (void)sendpacket(sin, RIPSIZE(nn)); 1357 return; 1358 } 1359 /* Whole routing table dump */ 1360 trace(1, "\tRIP Request -- whole routing table\n"); 1361 ripsend(ifcp, sin, RRTF_SENDANYWAY); 1362 } 1363 1364 /* 1365 * Get information of each interface. 1366 */ 1367 void 1368 ifconfig() 1369 { 1370 struct ifaddrs *ifap, *ifa; 1371 struct ifc *ifcp; 1372 struct ipv6_mreq mreq; 1373 int s; 1374 1375 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 1376 fatal("socket"); 1377 /*NOTREACHED*/ 1378 } 1379 1380 if (getifaddrs(&ifap) != 0) { 1381 fatal("getifaddrs"); 1382 /*NOTREACHED*/ 1383 } 1384 1385 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 1386 if (ifa->ifa_addr->sa_family != AF_INET6) 1387 continue; 1388 ifcp = ifc_find(ifa->ifa_name); 1389 /* we are interested in multicast-capable interfaces */ 1390 if ((ifa->ifa_flags & IFF_MULTICAST) == 0) 1391 continue; 1392 if (!ifcp) { 1393 /* new interface */ 1394 if ((ifcp = MALLOC(struct ifc)) == NULL) { 1395 fatal("malloc: struct ifc"); 1396 /*NOTREACHED*/ 1397 } 1398 memset(ifcp, 0, sizeof(*ifcp)); 1399 ifcp->ifc_index = -1; 1400 ifcp->ifc_next = ifc; 1401 ifc = ifcp; 1402 nifc++; 1403 ifcp->ifc_name = allocopy(ifa->ifa_name); 1404 ifcp->ifc_addr = 0; 1405 ifcp->ifc_filter = 0; 1406 ifcp->ifc_flags = ifa->ifa_flags; 1407 trace(1, "newif %s <%s>\n", ifcp->ifc_name, 1408 ifflags(ifcp->ifc_flags)); 1409 if (!strcmp(ifcp->ifc_name, LOOPBACK_IF)) 1410 loopifcp = ifcp; 1411 } else { 1412 /* update flag, this may be up again */ 1413 if (ifcp->ifc_flags != ifa->ifa_flags) { 1414 trace(1, "%s: <%s> -> ", ifcp->ifc_name, 1415 ifflags(ifcp->ifc_flags)); 1416 trace(1, "<%s>\n", ifflags(ifa->ifa_flags)); 1417 ifcp->ifc_cflags |= IFC_CHANGED; 1418 } 1419 ifcp->ifc_flags = ifa->ifa_flags; 1420 } 1421 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s); 1422 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP 1423 && 0 < ifcp->ifc_index && !ifcp->ifc_joined) { 1424 mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr; 1425 mreq.ipv6mr_interface = ifcp->ifc_index; 1426 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP, 1427 &mreq, sizeof(mreq)) < 0) { 1428 fatal("IPV6_JOIN_GROUP"); 1429 /*NOTREACHED*/ 1430 } 1431 trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST); 1432 ifcp->ifc_joined++; 1433 } 1434 } 1435 close(s); 1436 freeifaddrs(ifap); 1437 } 1438 1439 void 1440 ifconfig1(name, sa, ifcp, s) 1441 const char *name; 1442 const struct sockaddr *sa; 1443 struct ifc *ifcp; 1444 int s; 1445 { 1446 struct in6_ifreq ifr; 1447 const struct sockaddr_in6 *sin; 1448 struct ifac *ifa; 1449 int plen; 1450 char buf[BUFSIZ]; 1451 1452 sin = (const struct sockaddr_in6 *)sa; 1453 ifr.ifr_addr = *sin; 1454 strcpy(ifr.ifr_name, name); 1455 if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) { 1456 fatal("ioctl: SIOCGIFNETMASK_IN6"); 1457 /*NOTREACHED*/ 1458 } 1459 plen = sin6mask2len(&ifr.ifr_addr); 1460 if ((ifa = ifa_match(ifcp, &sin->sin6_addr, plen)) != NULL) { 1461 /* same interface found */ 1462 /* need check if something changed */ 1463 /* XXX not yet implemented */ 1464 return; 1465 } 1466 /* 1467 * New address is found 1468 */ 1469 if ((ifa = MALLOC(struct ifac)) == NULL) { 1470 fatal("malloc: struct ifac"); 1471 /*NOTREACHED*/ 1472 } 1473 memset(ifa, 0, sizeof(*ifa)); 1474 ifa->ifa_conf = ifcp; 1475 ifa->ifa_next = ifcp->ifc_addr; 1476 ifcp->ifc_addr = ifa; 1477 ifa->ifa_addr = sin->sin6_addr; 1478 ifa->ifa_plen = plen; 1479 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1480 ifr.ifr_addr = *sin; 1481 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) { 1482 fatal("ioctl: SIOCGIFDSTADDR_IN6"); 1483 /*NOTREACHED*/ 1484 } 1485 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr; 1486 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf)); 1487 trace(1, "found address %s/%d -- %s\n", 1488 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf); 1489 } else { 1490 trace(1, "found address %s/%d\n", 1491 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen); 1492 } 1493 if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 1494 ifcp->ifc_mylladdr = ifa->ifa_addr; 1495 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr); 1496 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len); 1497 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr, 1498 ifcp->ifc_index); 1499 setindex2ifc(ifcp->ifc_index, ifcp); 1500 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index); 1501 if (ifcp->ifc_mtu > RIP6_MAXMTU) 1502 ifcp->ifc_mtu = RIP6_MAXMTU; 1503 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) { 1504 fatal("ioctl: SIOCGIFMETRIC"); 1505 /*NOTREACHED*/ 1506 } 1507 ifcp->ifc_metric = ifr.ifr_metric; 1508 trace(1, "\tindex: %d, mtu: %d, metric: %d\n", 1509 ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric); 1510 } else 1511 ifcp->ifc_cflags |= IFC_CHANGED; 1512 } 1513 1514 /* 1515 * Receive and process routing messages. 1516 * Update interface information as necesssary. 1517 */ 1518 void 1519 rtrecv() 1520 { 1521 char buf[BUFSIZ]; 1522 char *p, *q; 1523 struct rt_msghdr *rtm; 1524 struct ifa_msghdr *ifam; 1525 struct if_msghdr *ifm; 1526 int len; 1527 struct ifc *ifcp, *ic; 1528 int iface = 0, rtable = 0; 1529 struct sockaddr_in6 *rta[RTAX_MAX]; 1530 struct sockaddr_in6 mask; 1531 int i, addrs; 1532 struct riprt *rrt; 1533 1534 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 1535 perror("read from rtsock"); 1536 exit(1); 1537 } 1538 if (len < sizeof(*rtm)) { 1539 trace(1, "short read from rtsock: %d (should be > %lu)\n", 1540 len, (u_long)sizeof(*rtm)); 1541 return; 1542 } 1543 1544 for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) { 1545 /* safety against bogus message */ 1546 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) { 1547 trace(1, "bogus rtmsg: length=%d\n", 1548 ((struct rt_msghdr *)p)->rtm_msglen); 1549 break; 1550 } 1551 rtm = NULL; 1552 ifam = NULL; 1553 ifm = NULL; 1554 switch (((struct rt_msghdr *)p)->rtm_type) { 1555 case RTM_NEWADDR: 1556 case RTM_DELADDR: 1557 ifam = (struct ifa_msghdr *)p; 1558 addrs = ifam->ifam_addrs; 1559 q = (char *)(ifam + 1); 1560 break; 1561 case RTM_IFINFO: 1562 ifm = (struct if_msghdr *)p; 1563 addrs = ifm->ifm_addrs; 1564 q = (char *)(ifm + 1); 1565 break; 1566 default: 1567 rtm = (struct rt_msghdr *)p; 1568 addrs = rtm->rtm_addrs; 1569 q = (char *)(rtm + 1); 1570 if (rtm->rtm_version != RTM_VERSION) { 1571 trace(1, "unexpected rtmsg version %d " 1572 "(should be %d)\n", 1573 rtm->rtm_version, RTM_VERSION); 1574 continue; 1575 } 1576 if (rtm->rtm_pid == pid) { 1577 #if 0 1578 trace(1, "rtmsg looped back to me, ignored\n"); 1579 #endif 1580 continue; 1581 } 1582 break; 1583 } 1584 memset(&rta, 0, sizeof(rta)); 1585 for (i = 0; i < RTAX_MAX; i++) { 1586 if (addrs & (1 << i)) { 1587 rta[i] = (struct sockaddr_in6 *)q; 1588 q += ROUNDUP(rta[i]->sin6_len); 1589 } 1590 } 1591 1592 trace(1, "rtsock: %s (addrs=%x)\n", 1593 rttypes((struct rt_msghdr *)p), addrs); 1594 if (dflag >= 2) { 1595 for (i = 0; 1596 i < ((struct rt_msghdr *)p)->rtm_msglen; 1597 i++) { 1598 fprintf(stderr, "%02x ", p[i] & 0xff); 1599 if (i % 16 == 15) fprintf(stderr, "\n"); 1600 } 1601 fprintf(stderr, "\n"); 1602 } 1603 1604 /* 1605 * Easy ones first. 1606 * 1607 * We may be able to optimize by using ifm->ifm_index or 1608 * ifam->ifam_index. For simplicity we don't do that here. 1609 */ 1610 switch (((struct rt_msghdr *)p)->rtm_type) { 1611 case RTM_NEWADDR: 1612 case RTM_IFINFO: 1613 iface++; 1614 continue; 1615 case RTM_ADD: 1616 rtable++; 1617 continue; 1618 case RTM_LOSING: 1619 case RTM_MISS: 1620 case RTM_RESOLVE: 1621 case RTM_GET: 1622 case RTM_LOCK: 1623 /* nothing to be done here */ 1624 trace(1, "\tnothing to be done, ignored\n"); 1625 continue; 1626 } 1627 1628 #if 0 1629 if (rta[RTAX_DST] == NULL) { 1630 trace(1, "\tno destination, ignored\n"); 1631 continue; 1632 } 1633 if (rta[RTAX_DST]->sin6_family != AF_INET6) { 1634 trace(1, "\taf mismatch, ignored\n"); 1635 continue; 1636 } 1637 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) { 1638 trace(1, "\tlinklocal destination, ignored\n"); 1639 continue; 1640 } 1641 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) { 1642 trace(1, "\tloopback destination, ignored\n"); 1643 continue; /* Loopback */ 1644 } 1645 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) { 1646 trace(1, "\tmulticast destination, ignored\n"); 1647 continue; 1648 } 1649 #endif 1650 1651 /* hard ones */ 1652 switch (((struct rt_msghdr *)p)->rtm_type) { 1653 case RTM_NEWADDR: 1654 case RTM_IFINFO: 1655 case RTM_ADD: 1656 case RTM_LOSING: 1657 case RTM_MISS: 1658 case RTM_RESOLVE: 1659 case RTM_GET: 1660 case RTM_LOCK: 1661 /* should already be handled */ 1662 fatal("rtrecv: never reach here"); 1663 /*NOTREACHED*/ 1664 case RTM_DELETE: 1665 if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) { 1666 trace(1, "\tsome of dst/gw/netamsk are " 1667 "unavailable, ignored\n"); 1668 break; 1669 } 1670 if ((rtm->rtm_flags & RTF_HOST) != 0) { 1671 mask.sin6_len = sizeof(mask); 1672 memset(&mask.sin6_addr, 0xff, 1673 sizeof(mask.sin6_addr)); 1674 rta[RTAX_NETMASK] = &mask; 1675 } else if (!rta[RTAX_NETMASK]) { 1676 trace(1, "\tsome of dst/gw/netamsk are " 1677 "unavailable, ignored\n"); 1678 break; 1679 } 1680 if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY], 1681 rta[RTAX_NETMASK]) == 0) { 1682 rtable++; /*just to be sure*/ 1683 } 1684 break; 1685 case RTM_CHANGE: 1686 case RTM_REDIRECT: 1687 trace(1, "\tnot supported yet, ignored\n"); 1688 break; 1689 case RTM_DELADDR: 1690 if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) { 1691 trace(1, "\tno netmask or ifa given, ignored\n"); 1692 break; 1693 } 1694 if (ifam->ifam_index < nindex2ifc) 1695 ifcp = index2ifc[ifam->ifam_index]; 1696 else 1697 ifcp = NULL; 1698 if (!ifcp) { 1699 trace(1, "\tinvalid ifam_index %d, ignored\n", 1700 ifam->ifam_index); 1701 break; 1702 } 1703 if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK])) 1704 iface++; 1705 break; 1706 case RTM_OLDADD: 1707 case RTM_OLDDEL: 1708 trace(1, "\tnot supported yet, ignored\n"); 1709 break; 1710 } 1711 1712 } 1713 1714 if (iface) { 1715 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n"); 1716 ifconfig(); 1717 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 1718 if (ifcp->ifc_cflags & IFC_CHANGED) { 1719 if (ifrt(ifcp, 1)) { 1720 for (ic = ifc; ic; ic = ic->ifc_next) { 1721 if (ifcp->ifc_index == ic->ifc_index) 1722 continue; 1723 if (ic->ifc_flags & IFF_UP) 1724 ripsend(ic, &ic->ifc_ripsin, 1725 RRTF_CHANGED); 1726 } 1727 /* Reset the flag */ 1728 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1729 rrt->rrt_rflags &= ~RRTF_CHANGED; 1730 } 1731 ifcp->ifc_cflags &= ~IFC_CHANGED; 1732 } 1733 } 1734 if (rtable) { 1735 trace(1, "rtsock: read routing table again\n"); 1736 krtread(1); 1737 } 1738 } 1739 1740 /* 1741 * remove specified route from the internal routing table. 1742 */ 1743 int 1744 rt_del(sdst, sgw, smask) 1745 const struct sockaddr_in6 *sdst; 1746 const struct sockaddr_in6 *sgw; 1747 const struct sockaddr_in6 *smask; 1748 { 1749 const struct in6_addr *dst = NULL; 1750 const struct in6_addr *gw = NULL; 1751 int prefix; 1752 struct netinfo6 ni6; 1753 struct riprt *rrt = NULL; 1754 time_t t_lifetime; 1755 1756 if (sdst->sin6_family != AF_INET6) { 1757 trace(1, "\tother AF, ignored\n"); 1758 return -1; 1759 } 1760 if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr) 1761 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback) 1762 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) { 1763 trace(1, "\taddress %s not interesting, ignored\n", 1764 inet6_n2p(&sdst->sin6_addr)); 1765 return -1; 1766 } 1767 dst = &sdst->sin6_addr; 1768 if (sgw->sin6_family == AF_INET6) { 1769 /* easy case */ 1770 gw = &sgw->sin6_addr; 1771 prefix = sin6mask2len(smask); 1772 } else if (sgw->sin6_family == AF_LINK) { 1773 /* 1774 * Interface route... a hard case. We need to get the prefix 1775 * length from the kernel, but we now are parsing rtmsg. 1776 * We'll purge matching routes from my list, then get the 1777 * fresh list. 1778 */ 1779 struct riprt *longest; 1780 trace(1, "\t%s is a interface route, guessing prefixlen\n", 1781 inet6_n2p(dst)); 1782 longest = NULL; 1783 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 1784 if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 1785 &sdst->sin6_addr) 1786 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) { 1787 if (!longest 1788 || longest->rrt_info.rip6_plen < 1789 rrt->rrt_info.rip6_plen) { 1790 longest = rrt; 1791 } 1792 } 1793 } 1794 rrt = longest; 1795 if (!rrt) { 1796 trace(1, "\tno matching interface route found\n"); 1797 return -1; 1798 } 1799 gw = &in6addr_loopback; 1800 prefix = rrt->rrt_info.rip6_plen; 1801 } else { 1802 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family); 1803 return -1; 1804 } 1805 1806 trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix); 1807 trace(1, "gw %s\n", inet6_n2p(gw)); 1808 t_lifetime = time(NULL) - RIP_LIFETIME; 1809 /* age route for interface address */ 1810 memset(&ni6, 0, sizeof(ni6)); 1811 ni6.rip6_dest = *dst; 1812 ni6.rip6_plen = prefix; 1813 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 1814 trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest), 1815 ni6.rip6_plen); 1816 if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) { 1817 trace(1, "\tno route found\n"); 1818 return -1; 1819 } 1820 #if 0 1821 if ((rrt->rrt_flags & RTF_STATIC) == 0) { 1822 trace(1, "\tyou can delete static routes only\n"); 1823 } else 1824 #endif 1825 if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) { 1826 trace(1, "\tgw mismatch: %s <-> ", 1827 inet6_n2p(&rrt->rrt_gw)); 1828 trace(1, "%s\n", inet6_n2p(gw)); 1829 } else { 1830 trace(1, "\troute found, age it\n"); 1831 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1832 rrt->rrt_t = t_lifetime; 1833 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 1834 } 1835 } 1836 return 0; 1837 } 1838 1839 /* 1840 * remove specified address from internal interface/routing table. 1841 */ 1842 int 1843 rt_deladdr(ifcp, sifa, smask) 1844 struct ifc *ifcp; 1845 const struct sockaddr_in6 *sifa; 1846 const struct sockaddr_in6 *smask; 1847 { 1848 const struct in6_addr *addr = NULL; 1849 int prefix; 1850 struct ifac *ifa = NULL; 1851 struct netinfo6 ni6; 1852 struct riprt *rrt = NULL; 1853 time_t t_lifetime; 1854 int updated = 0; 1855 1856 if (sifa->sin6_family != AF_INET6) { 1857 trace(1, "\tother AF, ignored\n"); 1858 return -1; 1859 } 1860 addr = &sifa->sin6_addr; 1861 prefix = sin6mask2len(smask); 1862 1863 trace(1, "\tdeleting %s/%d from %s\n", 1864 inet6_n2p(addr), prefix, ifcp->ifc_name); 1865 ifa = ifa_match(ifcp, addr, prefix); 1866 if (!ifa) { 1867 trace(1, "\tno matching ifa found for %s/%d on %s\n", 1868 inet6_n2p(addr), prefix, ifcp->ifc_name); 1869 return -1; 1870 } 1871 if (ifa->ifa_conf != ifcp) { 1872 trace(1, "\taddress table corrupt: back pointer does not match " 1873 "(%s != %s)\n", 1874 ifcp->ifc_name, ifa->ifa_conf->ifc_name); 1875 return -1; 1876 } 1877 /* remove ifa from interface */ 1878 if (ifcp->ifc_addr == ifa) 1879 ifcp->ifc_addr = ifa->ifa_next; 1880 else { 1881 struct ifac *p; 1882 for (p = ifcp->ifc_addr; p; p = p->ifa_next) { 1883 if (p->ifa_next == ifa) { 1884 p->ifa_next = ifa->ifa_next; 1885 break; 1886 } 1887 } 1888 } 1889 ifa->ifa_next = NULL; 1890 ifa->ifa_conf = NULL; 1891 t_lifetime = time(NULL) - RIP_LIFETIME; 1892 /* age route for interface address */ 1893 memset(&ni6, 0, sizeof(ni6)); 1894 ni6.rip6_dest = ifa->ifa_addr; 1895 ni6.rip6_plen = ifa->ifa_plen; 1896 applyplen(&ni6.rip6_dest, ni6.rip6_plen); 1897 trace(1, "\tfind interface route %s/%d on %d\n", 1898 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index); 1899 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 1900 struct in6_addr none; 1901 memset(&none, 0, sizeof(none)); 1902 if (rrt->rrt_index == ifcp->ifc_index && 1903 (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) || 1904 IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) { 1905 trace(1, "\troute found, age it\n"); 1906 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1907 rrt->rrt_t = t_lifetime; 1908 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 1909 } 1910 updated++; 1911 } else { 1912 trace(1, "\tnon-interface route found: %s/%d on %d\n", 1913 inet6_n2p(&rrt->rrt_info.rip6_dest), 1914 rrt->rrt_info.rip6_plen, 1915 rrt->rrt_index); 1916 } 1917 } else 1918 trace(1, "\tno interface route found\n"); 1919 /* age route for p2p destination */ 1920 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1921 memset(&ni6, 0, sizeof(ni6)); 1922 ni6.rip6_dest = ifa->ifa_raddr; 1923 ni6.rip6_plen = 128; 1924 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 1925 trace(1, "\tfind p2p route %s/%d on %d\n", 1926 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, 1927 ifcp->ifc_index); 1928 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 1929 if (rrt->rrt_index == ifcp->ifc_index && 1930 IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) { 1931 trace(1, "\troute found, age it\n"); 1932 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1933 rrt->rrt_t = t_lifetime; 1934 rrt->rrt_info.rip6_metric = 1935 HOPCNT_INFINITY6; 1936 updated++; 1937 } 1938 } else { 1939 trace(1, "\tnon-p2p route found: %s/%d on %d\n", 1940 inet6_n2p(&rrt->rrt_info.rip6_dest), 1941 rrt->rrt_info.rip6_plen, 1942 rrt->rrt_index); 1943 } 1944 } else 1945 trace(1, "\tno p2p route found\n"); 1946 } 1947 return updated ? 0 : -1; 1948 } 1949 1950 /* 1951 * Get each interface address and put those interface routes to the route 1952 * list. 1953 */ 1954 int 1955 ifrt(ifcp, again) 1956 struct ifc *ifcp; 1957 int again; 1958 { 1959 struct ifac *ifa; 1960 struct riprt *rrt, *search_rrt, *prev_rrt, *loop_rrt; 1961 struct netinfo6 *np; 1962 time_t t_lifetime; 1963 int need_trigger = 0; 1964 1965 if (ifcp->ifc_flags & IFF_LOOPBACK) 1966 return 0; /* ignore loopback */ 1967 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1968 ifrt_p2p(ifcp, again); 1969 return 0; 1970 } 1971 1972 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 1973 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 1974 #if 0 1975 trace(1, "route: %s on %s: " 1976 "skip linklocal interface address\n", 1977 inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name); 1978 #endif 1979 continue; 1980 } 1981 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) { 1982 #if 0 1983 trace(1, "route: %s: skip unspec interface address\n", 1984 ifcp->ifc_name); 1985 #endif 1986 continue; 1987 } 1988 if (ifcp->ifc_flags & IFF_UP) { 1989 if ((rrt = MALLOC(struct riprt)) == NULL) 1990 fatal("malloc: struct riprt"); 1991 memset(rrt, 0, sizeof(*rrt)); 1992 rrt->rrt_same = NULL; 1993 rrt->rrt_index = ifcp->ifc_index; 1994 rrt->rrt_t = 0; /* don't age */ 1995 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 1996 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 1997 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 1998 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 1999 rrt->rrt_flags = RTF_CLONING; 2000 rrt->rrt_rflags |= RRTF_CHANGED; 2001 applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen); 2002 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2003 #if 0 2004 /* XXX why gateway address == network adddress? */ 2005 rrt->rrt_gw = ifa->ifa_addr; 2006 #endif 2007 np = &rrt->rrt_info; 2008 search_rrt = rtsearch(np, &prev_rrt); 2009 if (search_rrt != NULL) { 2010 if (search_rrt->rrt_info.rip6_metric > 2011 rrt->rrt_info.rip6_metric) { 2012 if (prev_rrt) 2013 prev_rrt->rrt_next = rrt->rrt_next; 2014 else 2015 riprt = rrt->rrt_next; 2016 delroute(&rrt->rrt_info, &rrt->rrt_gw); 2017 free(rrt); 2018 } else { 2019 /* Already have better route */ 2020 if (!again) { 2021 trace(1, "route: %s/%d: " 2022 "already registered (%s)\n", 2023 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2024 ifcp->ifc_name); 2025 } 2026 free(rrt); 2027 continue; 2028 } 2029 } 2030 /* Attach the route to the list */ 2031 trace(1, "route: %s/%d: register route (%s)\n", 2032 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2033 ifcp->ifc_name); 2034 rrt->rrt_next = riprt; 2035 riprt = rrt; 2036 addroute(rrt, &rrt->rrt_gw, ifcp); 2037 sendrequest(ifcp); 2038 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 2039 need_trigger = 1; 2040 } else { 2041 for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) { 2042 if (loop_rrt->rrt_index == ifcp->ifc_index) { 2043 t_lifetime = time(NULL) - RIP_LIFETIME; 2044 if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) { 2045 loop_rrt->rrt_t = t_lifetime; 2046 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 2047 loop_rrt->rrt_rflags |= RRTF_CHANGED; 2048 need_trigger = 1; 2049 } 2050 } 2051 } 2052 } 2053 } 2054 return need_trigger; 2055 } 2056 2057 /* 2058 * there are couple of p2p interface routing models. "behavior" lets 2059 * you pick one. it looks that gated behavior fits best with BSDs, 2060 * since BSD kernels does not look at prefix length on p2p interfaces. 2061 */ 2062 void 2063 ifrt_p2p(ifcp, again) 2064 struct ifc *ifcp; 2065 int again; 2066 { 2067 struct ifac *ifa; 2068 struct riprt *rrt, *orrt, *prevrrt; 2069 struct netinfo6 *np; 2070 struct in6_addr addr, dest; 2071 int advert, ignore, i; 2072 #define P2PADVERT_NETWORK 1 2073 #define P2PADVERT_ADDR 2 2074 #define P2PADVERT_DEST 4 2075 #define P2PADVERT_MAX 4 2076 const enum { CISCO, GATED, ROUTE6D } behavior = GATED; 2077 const char *category = ""; 2078 const char *noadv; 2079 2080 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2081 addr = ifa->ifa_addr; 2082 dest = ifa->ifa_raddr; 2083 applyplen(&addr, ifa->ifa_plen); 2084 applyplen(&dest, ifa->ifa_plen); 2085 advert = ignore = 0; 2086 switch (behavior) { 2087 case CISCO: 2088 /* 2089 * honor addr/plen, just like normal shared medium 2090 * interface. this may cause trouble if you reuse 2091 * addr/plen on other interfaces. 2092 * 2093 * advertise addr/plen. 2094 */ 2095 advert |= P2PADVERT_NETWORK; 2096 break; 2097 case GATED: 2098 /* 2099 * prefixlen on p2p interface is meaningless. 2100 * advertise addr/128 and dest/128. 2101 * 2102 * do not install network route to route6d routing 2103 * table (if we do, it would prevent route installation 2104 * for other p2p interface that shares addr/plen). 2105 * 2106 * XXX what should we do if dest is ::? it will not 2107 * get announced anyways (see following filter), 2108 * but we need to think. 2109 */ 2110 advert |= P2PADVERT_ADDR; 2111 advert |= P2PADVERT_DEST; 2112 ignore |= P2PADVERT_NETWORK; 2113 break; 2114 case ROUTE6D: 2115 /* 2116 * just for testing. actually the code is redundant 2117 * given the current p2p interface address assignment 2118 * rule for kame kernel. 2119 * 2120 * intent: 2121 * A/n -> announce A/n 2122 * A B/n, A and B share prefix -> A/n (= B/n) 2123 * A B/n, do not share prefix -> A/128 and B/128 2124 * actually, A/64 and A B/128 are the only cases 2125 * permitted by the kernel: 2126 * A/64 -> A/64 2127 * A B/128 -> A/128 and B/128 2128 */ 2129 if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) { 2130 if (IN6_ARE_ADDR_EQUAL(&addr, &dest)) 2131 advert |= P2PADVERT_NETWORK; 2132 else { 2133 advert |= P2PADVERT_ADDR; 2134 advert |= P2PADVERT_DEST; 2135 ignore |= P2PADVERT_NETWORK; 2136 } 2137 } else 2138 advert |= P2PADVERT_NETWORK; 2139 break; 2140 } 2141 2142 for (i = 1; i <= P2PADVERT_MAX; i *= 2) { 2143 if ((ignore & i) != 0) 2144 continue; 2145 if ((rrt = MALLOC(struct riprt)) == NULL) { 2146 fatal("malloc: struct riprt"); 2147 /*NOTREACHED*/ 2148 } 2149 memset(rrt, 0, sizeof(*rrt)); 2150 rrt->rrt_same = NULL; 2151 rrt->rrt_index = ifcp->ifc_index; 2152 rrt->rrt_t = 0; /* don't age */ 2153 switch (i) { 2154 case P2PADVERT_NETWORK: 2155 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2156 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 2157 applyplen(&rrt->rrt_info.rip6_dest, 2158 ifa->ifa_plen); 2159 category = "network"; 2160 break; 2161 case P2PADVERT_ADDR: 2162 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2163 rrt->rrt_info.rip6_plen = 128; 2164 rrt->rrt_gw = in6addr_loopback; 2165 category = "addr"; 2166 break; 2167 case P2PADVERT_DEST: 2168 rrt->rrt_info.rip6_dest = ifa->ifa_raddr; 2169 rrt->rrt_info.rip6_plen = 128; 2170 rrt->rrt_gw = ifa->ifa_addr; 2171 category = "dest"; 2172 break; 2173 } 2174 if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) || 2175 IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) { 2176 #if 0 2177 trace(1, "route: %s: skip unspec/linklocal " 2178 "(%s on %s)\n", category, ifcp->ifc_name); 2179 #endif 2180 free(rrt); 2181 continue; 2182 } 2183 if ((advert & i) == 0) { 2184 rrt->rrt_rflags |= RRTF_NOADVERTISE; 2185 noadv = ", NO-ADV"; 2186 } else 2187 noadv = ""; 2188 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2189 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2190 np = &rrt->rrt_info; 2191 orrt = rtsearch(np, &prevrrt); 2192 if (!orrt) { 2193 /* Attach the route to the list */ 2194 trace(1, "route: %s/%d: register route " 2195 "(%s on %s%s)\n", 2196 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2197 category, ifcp->ifc_name, noadv); 2198 rrt->rrt_next = riprt; 2199 riprt = rrt; 2200 } else if (rrt->rrt_index != orrt->rrt_index || 2201 rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) { 2202 /* swap route */ 2203 rrt->rrt_next = orrt->rrt_next; 2204 if (prevrrt) 2205 prevrrt->rrt_next = rrt; 2206 else 2207 riprt = rrt; 2208 free(orrt); 2209 2210 trace(1, "route: %s/%d: update (%s on %s%s)\n", 2211 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2212 category, ifcp->ifc_name, noadv); 2213 } else { 2214 /* Already found */ 2215 if (!again) { 2216 trace(1, "route: %s/%d: " 2217 "already registered (%s on %s%s)\n", 2218 inet6_n2p(&np->rip6_dest), 2219 np->rip6_plen, category, 2220 ifcp->ifc_name, noadv); 2221 } 2222 free(rrt); 2223 } 2224 } 2225 } 2226 #undef P2PADVERT_NETWORK 2227 #undef P2PADVERT_ADDR 2228 #undef P2PADVERT_DEST 2229 #undef P2PADVERT_MAX 2230 } 2231 2232 int 2233 getifmtu(ifindex) 2234 int ifindex; 2235 { 2236 int mib[6]; 2237 char *buf; 2238 size_t msize; 2239 struct if_msghdr *ifm; 2240 int mtu; 2241 2242 mib[0] = CTL_NET; 2243 mib[1] = PF_ROUTE; 2244 mib[2] = 0; 2245 mib[3] = AF_INET6; 2246 mib[4] = NET_RT_IFLIST; 2247 mib[5] = ifindex; 2248 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2249 fatal("sysctl estimate NET_RT_IFLIST"); 2250 /*NOTREACHED*/ 2251 } 2252 if ((buf = malloc(msize)) == NULL) { 2253 fatal("malloc"); 2254 /*NOTREACHED*/ 2255 } 2256 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2257 fatal("sysctl NET_RT_IFLIST"); 2258 /*NOTREACHED*/ 2259 } 2260 ifm = (struct if_msghdr *)buf; 2261 mtu = ifm->ifm_data.ifi_mtu; 2262 #ifdef __FreeBSD__ 2263 if (ifindex != ifm->ifm_index) { 2264 fatal("ifindex does not match with ifm_index"); 2265 /*NOTREACHED*/ 2266 } 2267 #endif 2268 free(buf); 2269 return mtu; 2270 } 2271 2272 const char * 2273 rttypes(rtm) 2274 struct rt_msghdr *rtm; 2275 { 2276 #define RTTYPE(s, f) \ 2277 do { \ 2278 if (rtm->rtm_type == (f)) \ 2279 return (s); \ 2280 } while (0) 2281 RTTYPE("ADD", RTM_ADD); 2282 RTTYPE("DELETE", RTM_DELETE); 2283 RTTYPE("CHANGE", RTM_CHANGE); 2284 RTTYPE("GET", RTM_GET); 2285 RTTYPE("LOSING", RTM_LOSING); 2286 RTTYPE("REDIRECT", RTM_REDIRECT); 2287 RTTYPE("MISS", RTM_MISS); 2288 RTTYPE("LOCK", RTM_LOCK); 2289 RTTYPE("OLDADD", RTM_OLDADD); 2290 RTTYPE("OLDDEL", RTM_OLDDEL); 2291 RTTYPE("RESOLVE", RTM_RESOLVE); 2292 RTTYPE("NEWADDR", RTM_NEWADDR); 2293 RTTYPE("DELADDR", RTM_DELADDR); 2294 RTTYPE("IFINFO", RTM_IFINFO); 2295 #ifdef RTM_OLDADD 2296 RTTYPE("OLDADD", RTM_OLDADD); 2297 #endif 2298 #ifdef RTM_OLDDEL 2299 RTTYPE("OLDDEL", RTM_OLDDEL); 2300 #endif 2301 #ifdef RTM_OIFINFO 2302 RTTYPE("OIFINFO", RTM_OIFINFO); 2303 #endif 2304 #ifdef RTM_IFANNOUNCE 2305 RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE); 2306 #endif 2307 #ifdef RTM_NEWMADDR 2308 RTTYPE("NEWMADDR", RTM_NEWMADDR); 2309 #endif 2310 #ifdef RTM_DELMADDR 2311 RTTYPE("DELMADDR", RTM_DELMADDR); 2312 #endif 2313 #undef RTTYPE 2314 return NULL; 2315 } 2316 2317 const char * 2318 rtflags(rtm) 2319 struct rt_msghdr *rtm; 2320 { 2321 static char buf[BUFSIZ]; 2322 2323 /* 2324 * letter conflict should be okay. painful when *BSD diverges... 2325 */ 2326 strlcpy(buf, "", sizeof(buf)); 2327 #define RTFLAG(s, f) \ 2328 do { \ 2329 if (rtm->rtm_flags & (f)) \ 2330 strlcat(buf, (s), sizeof(buf)); \ 2331 } while (0) 2332 RTFLAG("U", RTF_UP); 2333 RTFLAG("G", RTF_GATEWAY); 2334 RTFLAG("H", RTF_HOST); 2335 RTFLAG("R", RTF_REJECT); 2336 RTFLAG("D", RTF_DYNAMIC); 2337 RTFLAG("M", RTF_MODIFIED); 2338 RTFLAG("d", RTF_DONE); 2339 #ifdef RTF_MASK 2340 RTFLAG("m", RTF_MASK); 2341 #endif 2342 RTFLAG("C", RTF_CLONING); 2343 #ifdef RTF_CLONED 2344 RTFLAG("c", RTF_CLONED); 2345 #endif 2346 #ifdef RTF_PRCLONING 2347 RTFLAG("c", RTF_PRCLONING); 2348 #endif 2349 #ifdef RTF_WASCLONED 2350 RTFLAG("W", RTF_WASCLONED); 2351 #endif 2352 RTFLAG("X", RTF_XRESOLVE); 2353 RTFLAG("L", RTF_LLINFO); 2354 RTFLAG("S", RTF_STATIC); 2355 RTFLAG("B", RTF_BLACKHOLE); 2356 #ifdef RTF_PROTO3 2357 RTFLAG("3", RTF_PROTO3); 2358 #endif 2359 RTFLAG("2", RTF_PROTO2); 2360 RTFLAG("1", RTF_PROTO1); 2361 #ifdef RTF_BROADCAST 2362 RTFLAG("b", RTF_BROADCAST); 2363 #endif 2364 #ifdef RTF_DEFAULT 2365 RTFLAG("d", RTF_DEFAULT); 2366 #endif 2367 #ifdef RTF_ISAROUTER 2368 RTFLAG("r", RTF_ISAROUTER); 2369 #endif 2370 #ifdef RTF_TUNNEL 2371 RTFLAG("T", RTF_TUNNEL); 2372 #endif 2373 #ifdef RTF_AUTH 2374 RTFLAG("A", RTF_AUTH); 2375 #endif 2376 #ifdef RTF_CRYPT 2377 RTFLAG("E", RTF_CRYPT); 2378 #endif 2379 #undef RTFLAG 2380 return buf; 2381 } 2382 2383 const char * 2384 ifflags(flags) 2385 int flags; 2386 { 2387 static char buf[BUFSIZ]; 2388 2389 strlcpy(buf, "", sizeof(buf)); 2390 #define IFFLAG(s, f) \ 2391 do { \ 2392 if (flags & f) { \ 2393 if (buf[0]) \ 2394 strlcat(buf, ",", sizeof(buf)); \ 2395 strlcat(buf, s, sizeof(buf)); \ 2396 } \ 2397 } while (0) 2398 IFFLAG("UP", IFF_UP); 2399 IFFLAG("BROADCAST", IFF_BROADCAST); 2400 IFFLAG("DEBUG", IFF_DEBUG); 2401 IFFLAG("LOOPBACK", IFF_LOOPBACK); 2402 IFFLAG("POINTOPOINT", IFF_POINTOPOINT); 2403 #ifdef IFF_NOTRAILERS 2404 IFFLAG("NOTRAILERS", IFF_NOTRAILERS); 2405 #endif 2406 #ifdef IFF_SMART 2407 IFFLAG("SMART", IFF_SMART); 2408 #endif 2409 IFFLAG("RUNNING", IFF_RUNNING); 2410 IFFLAG("NOARP", IFF_NOARP); 2411 IFFLAG("PROMISC", IFF_PROMISC); 2412 IFFLAG("ALLMULTI", IFF_ALLMULTI); 2413 IFFLAG("OACTIVE", IFF_OACTIVE); 2414 IFFLAG("SIMPLEX", IFF_SIMPLEX); 2415 IFFLAG("LINK0", IFF_LINK0); 2416 IFFLAG("LINK1", IFF_LINK1); 2417 IFFLAG("LINK2", IFF_LINK2); 2418 IFFLAG("MULTICAST", IFF_MULTICAST); 2419 #undef IFFLAG 2420 return buf; 2421 } 2422 2423 void 2424 krtread(again) 2425 int again; 2426 { 2427 int mib[6]; 2428 size_t msize; 2429 char *buf, *p, *lim; 2430 struct rt_msghdr *rtm; 2431 int retry; 2432 const char *errmsg; 2433 2434 retry = 0; 2435 buf = NULL; 2436 mib[0] = CTL_NET; 2437 mib[1] = PF_ROUTE; 2438 mib[2] = 0; 2439 mib[3] = AF_INET6; /* Address family */ 2440 mib[4] = NET_RT_DUMP; /* Dump the kernel routing table */ 2441 mib[5] = 0; /* No flags */ 2442 do { 2443 retry++; 2444 errmsg = NULL; 2445 if (buf) 2446 free(buf); 2447 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2448 errmsg = "sysctl estimate"; 2449 continue; 2450 } 2451 if ((buf = malloc(msize)) == NULL) { 2452 errmsg = "malloc"; 2453 continue; 2454 } 2455 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2456 errmsg = "sysctl NET_RT_DUMP"; 2457 continue; 2458 } 2459 } while (retry < 5 && errmsg != NULL); 2460 if (errmsg) { 2461 fatal("%s (with %d retries, msize=%lu)", errmsg, retry, 2462 (u_long)msize); 2463 /*NOTREACHED*/ 2464 } else if (1 < retry) 2465 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry); 2466 2467 lim = buf + msize; 2468 for (p = buf; p < lim; p += rtm->rtm_msglen) { 2469 rtm = (struct rt_msghdr *)p; 2470 rt_entry(rtm, again); 2471 } 2472 free(buf); 2473 } 2474 2475 void 2476 rt_entry(rtm, again) 2477 struct rt_msghdr *rtm; 2478 int again; 2479 { 2480 struct sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask; 2481 struct sockaddr_in6 *sin6_genmask, *sin6_ifp; 2482 char *rtmp, *ifname = NULL; 2483 struct riprt *rrt, *orrt; 2484 struct netinfo6 *np; 2485 int s; 2486 2487 sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0; 2488 if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags & 2489 (RTF_CLONING|RTF_XRESOLVE|RTF_LLINFO|RTF_BLACKHOLE)) { 2490 return; /* not interested in the link route */ 2491 } 2492 /* do not look at cloned routes */ 2493 #ifdef RTF_WASCLONED 2494 if (rtm->rtm_flags & RTF_WASCLONED) 2495 return; 2496 #endif 2497 #ifdef RTF_CLONED 2498 if (rtm->rtm_flags & RTF_CLONED) 2499 return; 2500 #endif 2501 /* 2502 * do not look at dynamic routes. 2503 * netbsd/openbsd cloned routes have UGHD. 2504 */ 2505 if (rtm->rtm_flags & RTF_DYNAMIC) 2506 return; 2507 rtmp = (char *)(rtm + 1); 2508 /* Destination */ 2509 if ((rtm->rtm_addrs & RTA_DST) == 0) 2510 return; /* ignore routes without destination address */ 2511 sin6_dst = (struct sockaddr_in6 *)rtmp; 2512 rtmp += ROUNDUP(sin6_dst->sin6_len); 2513 if (rtm->rtm_addrs & RTA_GATEWAY) { 2514 sin6_gw = (struct sockaddr_in6 *)rtmp; 2515 rtmp += ROUNDUP(sin6_gw->sin6_len); 2516 } 2517 if (rtm->rtm_addrs & RTA_NETMASK) { 2518 sin6_mask = (struct sockaddr_in6 *)rtmp; 2519 rtmp += ROUNDUP(sin6_mask->sin6_len); 2520 } 2521 if (rtm->rtm_addrs & RTA_GENMASK) { 2522 sin6_genmask = (struct sockaddr_in6 *)rtmp; 2523 rtmp += ROUNDUP(sin6_genmask->sin6_len); 2524 } 2525 if (rtm->rtm_addrs & RTA_IFP) { 2526 sin6_ifp = (struct sockaddr_in6 *)rtmp; 2527 rtmp += ROUNDUP(sin6_ifp->sin6_len); 2528 } 2529 2530 /* Destination */ 2531 if (sin6_dst->sin6_family != AF_INET6) 2532 return; 2533 if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr)) 2534 return; /* Link-local */ 2535 if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback)) 2536 return; /* Loopback */ 2537 if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr)) 2538 return; 2539 2540 if ((rrt = MALLOC(struct riprt)) == NULL) { 2541 fatal("malloc: struct riprt"); 2542 /*NOTREACHED*/ 2543 } 2544 memset(rrt, 0, sizeof(*rrt)); 2545 np = &rrt->rrt_info; 2546 rrt->rrt_same = NULL; 2547 rrt->rrt_t = time(NULL); 2548 if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC)) 2549 rrt->rrt_t = 0; /* Don't age static routes */ 2550 #if 0 2551 np->rip6_tag = htons(routetag & 0xffff); 2552 #else 2553 np->rip6_tag = 0; 2554 #endif 2555 np->rip6_metric = rtm->rtm_rmx.rmx_hopcount; 2556 if (np->rip6_metric < 1) 2557 np->rip6_metric = 1; 2558 rrt->rrt_flags = rtm->rtm_flags; 2559 np->rip6_dest = sin6_dst->sin6_addr; 2560 2561 /* Mask or plen */ 2562 if (rtm->rtm_flags & RTF_HOST) 2563 np->rip6_plen = 128; /* Host route */ 2564 else if (sin6_mask) 2565 np->rip6_plen = sin6mask2len(sin6_mask); 2566 else 2567 np->rip6_plen = 0; 2568 2569 orrt = rtsearch(np, NULL); 2570 if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) { 2571 /* Already found */ 2572 if (!again) { 2573 trace(1, "route: %s/%d flags %s: already registered\n", 2574 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2575 rtflags(rtm)); 2576 } 2577 free(rrt); 2578 return; 2579 } 2580 /* Gateway */ 2581 if (!sin6_gw) 2582 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2583 else { 2584 if (sin6_gw->sin6_family == AF_INET6) 2585 rrt->rrt_gw = sin6_gw->sin6_addr; 2586 else if (sin6_gw->sin6_family == AF_LINK) { 2587 /* XXX in case ppp link? */ 2588 rrt->rrt_gw = in6addr_loopback; 2589 } else 2590 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2591 } 2592 trace(1, "route: %s/%d flags %s", 2593 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm)); 2594 trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw)); 2595 2596 /* Interface */ 2597 s = rtm->rtm_index; 2598 if (s < nindex2ifc && index2ifc[s]) 2599 ifname = index2ifc[s]->ifc_name; 2600 else { 2601 trace(1, " not configured\n"); 2602 free(rrt); 2603 return; 2604 } 2605 trace(1, " if %s sock %d", ifname, s); 2606 rrt->rrt_index = s; 2607 2608 trace(1, "\n"); 2609 2610 /* Check gateway */ 2611 if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) && 2612 !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw) 2613 #ifdef __FreeBSD__ 2614 && (rrt->rrt_flags & RTF_LOCAL) == 0 2615 #endif 2616 ) { 2617 trace(0, "***** Gateway %s is not a link-local address.\n", 2618 inet6_n2p(&rrt->rrt_gw)); 2619 trace(0, "***** dest(%s) if(%s) -- Not optimized.\n", 2620 inet6_n2p(&rrt->rrt_info.rip6_dest), ifname); 2621 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR; 2622 } 2623 2624 /* Put it to the route list */ 2625 if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) { 2626 /* replace route list */ 2627 rrt->rrt_next = orrt->rrt_next; 2628 *orrt = *rrt; 2629 trace(1, "route: %s/%d flags %s: replace new route\n", 2630 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2631 rtflags(rtm)); 2632 free(rrt); 2633 } else { 2634 rrt->rrt_next = riprt; 2635 riprt = rrt; 2636 } 2637 } 2638 2639 int 2640 addroute(rrt, gw, ifcp) 2641 struct riprt *rrt; 2642 const struct in6_addr *gw; 2643 struct ifc *ifcp; 2644 { 2645 struct netinfo6 *np; 2646 u_char buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ]; 2647 struct rt_msghdr *rtm; 2648 struct sockaddr_in6 *sin; 2649 int len; 2650 2651 np = &rrt->rrt_info; 2652 inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1)); 2653 inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2)); 2654 tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n", 2655 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2656 np->rip6_metric - 1, buf2); 2657 if (rtlog) 2658 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(), 2659 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2660 np->rip6_metric - 1, buf2); 2661 if (nflag) 2662 return 0; 2663 2664 memset(buf, 0, sizeof(buf)); 2665 rtm = (struct rt_msghdr *)buf; 2666 rtm->rtm_type = RTM_ADD; 2667 rtm->rtm_version = RTM_VERSION; 2668 rtm->rtm_seq = ++seq; 2669 rtm->rtm_pid = pid; 2670 rtm->rtm_flags = rrt->rrt_flags; 2671 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2672 rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1; 2673 rtm->rtm_inits = RTV_HOPCOUNT; 2674 sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2675 /* Destination */ 2676 sin->sin6_len = sizeof(struct sockaddr_in6); 2677 sin->sin6_family = AF_INET6; 2678 sin->sin6_addr = np->rip6_dest; 2679 sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len)); 2680 /* Gateway */ 2681 sin->sin6_len = sizeof(struct sockaddr_in6); 2682 sin->sin6_family = AF_INET6; 2683 sin->sin6_addr = *gw; 2684 sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len)); 2685 /* Netmask */ 2686 sin->sin6_len = sizeof(struct sockaddr_in6); 2687 sin->sin6_family = AF_INET6; 2688 sin->sin6_addr = *(plen2mask(np->rip6_plen)); 2689 sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len)); 2690 2691 len = (char *)sin - (char *)buf; 2692 rtm->rtm_msglen = len; 2693 if (write(rtsock, buf, len) > 0) 2694 return 0; 2695 2696 if (errno == EEXIST) { 2697 trace(0, "ADD: Route already exists %s/%d gw %s\n", 2698 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2699 if (rtlog) 2700 fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n", 2701 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2702 } else { 2703 trace(0, "Can not write to rtsock (addroute): %s\n", 2704 strerror(errno)); 2705 if (rtlog) 2706 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2707 strerror(errno)); 2708 } 2709 return -1; 2710 } 2711 2712 int 2713 delroute(np, gw) 2714 struct netinfo6 *np; 2715 struct in6_addr *gw; 2716 { 2717 u_char buf[BUFSIZ], buf2[BUFSIZ]; 2718 struct rt_msghdr *rtm; 2719 struct sockaddr_in6 *sin; 2720 int len; 2721 2722 inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2)); 2723 tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest), 2724 np->rip6_plen, buf2); 2725 if (rtlog) 2726 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n", 2727 hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2728 if (nflag) 2729 return 0; 2730 2731 memset(buf, 0, sizeof(buf)); 2732 rtm = (struct rt_msghdr *)buf; 2733 rtm->rtm_type = RTM_DELETE; 2734 rtm->rtm_version = RTM_VERSION; 2735 rtm->rtm_seq = ++seq; 2736 rtm->rtm_pid = pid; 2737 rtm->rtm_flags = RTF_UP | RTF_GATEWAY; 2738 if (np->rip6_plen == sizeof(struct in6_addr) * 8) 2739 rtm->rtm_flags |= RTF_HOST; 2740 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2741 sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2742 /* Destination */ 2743 sin->sin6_len = sizeof(struct sockaddr_in6); 2744 sin->sin6_family = AF_INET6; 2745 sin->sin6_addr = np->rip6_dest; 2746 sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len)); 2747 /* Gateway */ 2748 sin->sin6_len = sizeof(struct sockaddr_in6); 2749 sin->sin6_family = AF_INET6; 2750 sin->sin6_addr = *gw; 2751 sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len)); 2752 /* Netmask */ 2753 sin->sin6_len = sizeof(struct sockaddr_in6); 2754 sin->sin6_family = AF_INET6; 2755 sin->sin6_addr = *(plen2mask(np->rip6_plen)); 2756 sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len)); 2757 2758 len = (char *)sin - (char *)buf; 2759 rtm->rtm_msglen = len; 2760 if (write(rtsock, buf, len) >= 0) 2761 return 0; 2762 2763 if (errno == ESRCH) { 2764 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n", 2765 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2766 if (rtlog) 2767 fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n", 2768 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2769 } else { 2770 trace(0, "Can not write to rtsock (delroute): %s\n", 2771 strerror(errno)); 2772 if (rtlog) 2773 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2774 strerror(errno)); 2775 } 2776 return -1; 2777 } 2778 2779 struct in6_addr * 2780 getroute(np, gw) 2781 struct netinfo6 *np; 2782 struct in6_addr *gw; 2783 { 2784 u_char buf[BUFSIZ]; 2785 u_long myseq; 2786 int len; 2787 struct rt_msghdr *rtm; 2788 struct sockaddr_in6 *sin; 2789 2790 rtm = (struct rt_msghdr *)buf; 2791 len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6); 2792 memset(rtm, 0, len); 2793 rtm->rtm_type = RTM_GET; 2794 rtm->rtm_version = RTM_VERSION; 2795 myseq = ++seq; 2796 rtm->rtm_seq = myseq; 2797 rtm->rtm_addrs = RTA_DST; 2798 rtm->rtm_msglen = len; 2799 sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2800 sin->sin6_len = sizeof(struct sockaddr_in6); 2801 sin->sin6_family = AF_INET6; 2802 sin->sin6_addr = np->rip6_dest; 2803 if (write(rtsock, buf, len) < 0) { 2804 if (errno == ESRCH) /* No such route found */ 2805 return NULL; 2806 perror("write to rtsock"); 2807 exit(1); 2808 } 2809 do { 2810 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 2811 perror("read from rtsock"); 2812 exit(1); 2813 } 2814 rtm = (struct rt_msghdr *)buf; 2815 } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid); 2816 sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2817 if (rtm->rtm_addrs & RTA_DST) { 2818 sin = (struct sockaddr_in6 *) 2819 ((char *)sin + ROUNDUP(sin->sin6_len)); 2820 } 2821 if (rtm->rtm_addrs & RTA_GATEWAY) { 2822 *gw = sin->sin6_addr; 2823 return gw; 2824 } 2825 return NULL; 2826 } 2827 2828 const char * 2829 inet6_n2p(p) 2830 const struct in6_addr *p; 2831 { 2832 static char buf[BUFSIZ]; 2833 2834 return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf)); 2835 } 2836 2837 void 2838 ifrtdump(sig) 2839 int sig; 2840 { 2841 2842 ifdump(sig); 2843 rtdump(sig); 2844 } 2845 2846 void 2847 ifdump(sig) 2848 int sig; 2849 { 2850 struct ifc *ifcp; 2851 FILE *dump; 2852 int i; 2853 2854 if (sig == 0) 2855 dump = stderr; 2856 else 2857 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 2858 dump = stderr; 2859 2860 fprintf(dump, "%s: Interface Table Dump\n", hms()); 2861 fprintf(dump, " Number of interfaces: %d\n", nifc); 2862 for (i = 0; i < 2; i++) { 2863 fprintf(dump, " %sadvertising interfaces:\n", i ? "non-" : ""); 2864 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 2865 if (i == 0) { 2866 if ((ifcp->ifc_flags & IFF_UP) == 0) 2867 continue; 2868 if (iff_find(ifcp, 'N') != NULL) 2869 continue; 2870 } else { 2871 if (ifcp->ifc_flags & IFF_UP) 2872 continue; 2873 } 2874 ifdump0(dump, ifcp); 2875 } 2876 } 2877 fprintf(dump, "\n"); 2878 if (dump != stderr) 2879 fclose(dump); 2880 } 2881 2882 void 2883 ifdump0(dump, ifcp) 2884 FILE *dump; 2885 const struct ifc *ifcp; 2886 { 2887 struct ifac *ifa; 2888 struct iff *iffp; 2889 char buf[BUFSIZ]; 2890 const char *ft; 2891 int addr; 2892 2893 fprintf(dump, " %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n", 2894 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags), 2895 inet6_n2p(&ifcp->ifc_mylladdr), 2896 ifcp->ifc_mtu, ifcp->ifc_metric); 2897 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2898 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 2899 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, 2900 buf, sizeof(buf)); 2901 fprintf(dump, "\t%s/%d -- %s\n", 2902 inet6_n2p(&ifa->ifa_addr), 2903 ifa->ifa_plen, buf); 2904 } else { 2905 fprintf(dump, "\t%s/%d\n", 2906 inet6_n2p(&ifa->ifa_addr), 2907 ifa->ifa_plen); 2908 } 2909 } 2910 if (ifcp->ifc_filter) { 2911 fprintf(dump, "\tFilter:"); 2912 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 2913 addr = 0; 2914 switch (iffp->iff_type) { 2915 case 'A': 2916 ft = "Aggregate"; addr++; break; 2917 case 'N': 2918 ft = "No-use"; break; 2919 case 'O': 2920 ft = "Advertise-only"; addr++; break; 2921 case 'T': 2922 ft = "Default-only"; break; 2923 case 'L': 2924 ft = "Listen-only"; addr++; break; 2925 default: 2926 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type); 2927 ft = buf; 2928 addr++; 2929 break; 2930 } 2931 fprintf(dump, " %s", ft); 2932 if (addr) { 2933 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr), 2934 iffp->iff_plen); 2935 } 2936 } 2937 fprintf(dump, "\n"); 2938 } 2939 } 2940 2941 void 2942 rtdump(sig) 2943 int sig; 2944 { 2945 struct riprt *rrt; 2946 char buf[BUFSIZ]; 2947 FILE *dump; 2948 time_t t, age; 2949 2950 if (sig == 0) 2951 dump = stderr; 2952 else 2953 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 2954 dump = stderr; 2955 2956 t = time(NULL); 2957 fprintf(dump, "\n%s: Routing Table Dump\n", hms()); 2958 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 2959 if (rrt->rrt_t == 0) 2960 age = 0; 2961 else 2962 age = t - rrt->rrt_t; 2963 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest, 2964 buf, sizeof(buf)); 2965 fprintf(dump, " %s/%d if(%d:%s) gw(%s) [%d] age(%ld)", 2966 buf, rrt->rrt_info.rip6_plen, rrt->rrt_index, 2967 index2ifc[rrt->rrt_index]->ifc_name, 2968 inet6_n2p(&rrt->rrt_gw), 2969 rrt->rrt_info.rip6_metric, (long)age); 2970 if (rrt->rrt_info.rip6_tag) { 2971 fprintf(dump, " tag(0x%04x)", 2972 ntohs(rrt->rrt_info.rip6_tag) & 0xffff); 2973 } 2974 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) 2975 fprintf(dump, " NOT-LL"); 2976 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 2977 fprintf(dump, " NO-ADV"); 2978 fprintf(dump, "\n"); 2979 } 2980 fprintf(dump, "\n"); 2981 if (dump != stderr) 2982 fclose(dump); 2983 } 2984 2985 /* 2986 * Parse the -A (and -O) options and put corresponding filter object to the 2987 * specified interface structures. Each of the -A/O option has the following 2988 * syntax: -A 5f09:c400::/32,ef0,ef1 (aggregate) 2989 * -O 5f09:c400::/32,ef0,ef1 (only when match) 2990 */ 2991 void 2992 filterconfig() 2993 { 2994 int i; 2995 char *p, *ap, *iflp, *ifname; 2996 struct iff ftmp, *iff_obj; 2997 struct ifc *ifcp; 2998 struct riprt *rrt; 2999 #if 0 3000 struct in6_addr gw; 3001 #endif 3002 3003 for (i = 0; i < nfilter; i++) { 3004 ap = filter[i]; 3005 iflp = NULL; 3006 ifcp = NULL; 3007 if (filtertype[i] == 'N' || filtertype[i] == 'T') { 3008 iflp = ap; 3009 goto ifonly; 3010 } 3011 if ((p = index(ap, ',')) != NULL) { 3012 *p++ = '\0'; 3013 iflp = p; 3014 } 3015 if ((p = index(ap, '/')) == NULL) { 3016 fatal("no prefixlen specified for '%s'", ap); 3017 /*NOTREACHED*/ 3018 } 3019 *p++ = '\0'; 3020 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) { 3021 fatal("invalid prefix specified for '%s'", ap); 3022 /*NOTREACHED*/ 3023 } 3024 ftmp.iff_plen = atoi(p); 3025 ftmp.iff_next = NULL; 3026 applyplen(&ftmp.iff_addr, ftmp.iff_plen); 3027 ifonly: 3028 ftmp.iff_type = filtertype[i]; 3029 if (iflp == NULL || *iflp == '\0') { 3030 fatal("no interface specified for '%s'", ap); 3031 /*NOTREACHED*/ 3032 } 3033 /* parse the interface listing portion */ 3034 while (iflp) { 3035 ifname = iflp; 3036 if ((iflp = index(iflp, ',')) != NULL) 3037 *iflp++ = '\0'; 3038 ifcp = ifc_find(ifname); 3039 if (ifcp == NULL) { 3040 fatal("no interface %s exists", ifname); 3041 /*NOTREACHED*/ 3042 } 3043 iff_obj = (struct iff *)malloc(sizeof(struct iff)); 3044 if (iff_obj == NULL) { 3045 fatal("malloc of iff_obj"); 3046 /*NOTREACHED*/ 3047 } 3048 memcpy((void *)iff_obj, (void *)&ftmp, 3049 sizeof(struct iff)); 3050 /* link it to the interface filter */ 3051 iff_obj->iff_next = ifcp->ifc_filter; 3052 ifcp->ifc_filter = iff_obj; 3053 } 3054 3055 /* 3056 * -A: aggregate configuration. 3057 */ 3058 if (filtertype[i] != 'A') 3059 continue; 3060 /* put the aggregate to the kernel routing table */ 3061 rrt = (struct riprt *)malloc(sizeof(struct riprt)); 3062 if (rrt == NULL) { 3063 fatal("malloc: rrt"); 3064 /*NOTREACHED*/ 3065 } 3066 memset(rrt, 0, sizeof(struct riprt)); 3067 rrt->rrt_info.rip6_dest = ftmp.iff_addr; 3068 rrt->rrt_info.rip6_plen = ftmp.iff_plen; 3069 rrt->rrt_info.rip6_metric = 1; 3070 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 3071 rrt->rrt_gw = in6addr_loopback; 3072 rrt->rrt_flags = RTF_UP | RTF_REJECT; 3073 rrt->rrt_rflags = RRTF_AGGREGATE; 3074 rrt->rrt_t = 0; 3075 rrt->rrt_index = loopifindex; 3076 #if 0 3077 if (getroute(&rrt->rrt_info, &gw)) { 3078 #if 0 3079 /* 3080 * When the address has already been registered in the 3081 * kernel routing table, it should be removed 3082 */ 3083 delroute(&rrt->rrt_info, &gw); 3084 #else 3085 /* it is safer behavior */ 3086 errno = EINVAL; 3087 fatal("%s/%u already in routing table, " 3088 "cannot aggregate", 3089 inet6_n2p(&rrt->rrt_info.rip6_dest), 3090 rrt->rrt_info.rip6_plen); 3091 /*NOTREACHED*/ 3092 #endif 3093 } 3094 #endif 3095 /* Put the route to the list */ 3096 rrt->rrt_next = riprt; 3097 riprt = rrt; 3098 trace(1, "Aggregate: %s/%d for %s\n", 3099 inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen, 3100 ifcp->ifc_name); 3101 /* Add this route to the kernel */ 3102 if (nflag) /* do not modify kernel routing table */ 3103 continue; 3104 addroute(rrt, &in6addr_loopback, loopifcp); 3105 } 3106 } 3107 3108 /***************** utility functions *****************/ 3109 3110 /* 3111 * Returns a pointer to ifac whose address and prefix length matches 3112 * with the address and prefix length specified in the arguments. 3113 */ 3114 struct ifac * 3115 ifa_match(ifcp, ia, plen) 3116 const struct ifc *ifcp; 3117 const struct in6_addr *ia; 3118 int plen; 3119 { 3120 struct ifac *ifa; 3121 3122 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 3123 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) && 3124 ifa->ifa_plen == plen) 3125 break; 3126 } 3127 return ifa; 3128 } 3129 3130 /* 3131 * Return a pointer to riprt structure whose address and prefix length 3132 * matches with the address and prefix length found in the argument. 3133 * Note: This is not a rtalloc(). Therefore exact match is necessary. 3134 */ 3135 struct riprt * 3136 rtsearch(np, prev_rrt) 3137 struct netinfo6 *np; 3138 struct riprt **prev_rrt; 3139 { 3140 struct riprt *rrt; 3141 3142 if (prev_rrt) 3143 *prev_rrt = NULL; 3144 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 3145 if (rrt->rrt_info.rip6_plen == np->rip6_plen && 3146 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 3147 &np->rip6_dest)) 3148 return rrt; 3149 if (prev_rrt) 3150 *prev_rrt = rrt; 3151 } 3152 if (prev_rrt) 3153 *prev_rrt = NULL; 3154 return 0; 3155 } 3156 3157 int 3158 sin6mask2len(sin6) 3159 const struct sockaddr_in6 *sin6; 3160 { 3161 3162 return mask2len(&sin6->sin6_addr, 3163 sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr)); 3164 } 3165 3166 int 3167 mask2len(addr, lenlim) 3168 const struct in6_addr *addr; 3169 int lenlim; 3170 { 3171 int i = 0, j; 3172 const u_char *p = (const u_char *)addr; 3173 3174 for (j = 0; j < lenlim; j++, p++) { 3175 if (*p != 0xff) 3176 break; 3177 i += 8; 3178 } 3179 if (j < lenlim) { 3180 switch (*p) { 3181 #define MASKLEN(m, l) case m: do { i += l; break; } while (0) 3182 MASKLEN(0xfe, 7); break; 3183 MASKLEN(0xfc, 6); break; 3184 MASKLEN(0xf8, 5); break; 3185 MASKLEN(0xf0, 4); break; 3186 MASKLEN(0xe0, 3); break; 3187 MASKLEN(0xc0, 2); break; 3188 MASKLEN(0x80, 1); break; 3189 #undef MASKLEN 3190 } 3191 } 3192 return i; 3193 } 3194 3195 void 3196 applymask(addr, mask) 3197 struct in6_addr *addr, *mask; 3198 { 3199 int i; 3200 u_long *p, *q; 3201 3202 p = (u_long *)addr; q = (u_long *)mask; 3203 for (i = 0; i < 4; i++) 3204 *p++ &= *q++; 3205 } 3206 3207 static const u_char plent[8] = { 3208 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe 3209 }; 3210 3211 void 3212 applyplen(ia, plen) 3213 struct in6_addr *ia; 3214 int plen; 3215 { 3216 u_char *p; 3217 int i; 3218 3219 p = ia->s6_addr; 3220 for (i = 0; i < 16; i++) { 3221 if (plen <= 0) 3222 *p = 0; 3223 else if (plen < 8) 3224 *p &= plent[plen]; 3225 p++, plen -= 8; 3226 } 3227 } 3228 3229 static const int pl2m[9] = { 3230 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff 3231 }; 3232 3233 struct in6_addr * 3234 plen2mask(n) 3235 int n; 3236 { 3237 static struct in6_addr ia; 3238 u_char *p; 3239 int i; 3240 3241 memset(&ia, 0, sizeof(struct in6_addr)); 3242 p = (u_char *)&ia; 3243 for (i = 0; i < 16; i++, p++, n -= 8) { 3244 if (n >= 8) { 3245 *p = 0xff; 3246 continue; 3247 } 3248 *p = pl2m[n]; 3249 break; 3250 } 3251 return &ia; 3252 } 3253 3254 char * 3255 allocopy(p) 3256 char *p; 3257 { 3258 char *q = (char *)malloc(strlen(p) + 1); 3259 3260 strcpy(q, p); 3261 return q; 3262 } 3263 3264 char * 3265 hms() 3266 { 3267 static char buf[BUFSIZ]; 3268 time_t t; 3269 struct tm *tm; 3270 3271 t = time(NULL); 3272 if ((tm = localtime(&t)) == 0) { 3273 fatal("localtime"); 3274 /*NOTREACHED*/ 3275 } 3276 snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min, 3277 tm->tm_sec); 3278 return buf; 3279 } 3280 3281 #define RIPRANDDEV 1.0 /* 30 +- 15, max - min = 30 */ 3282 3283 int 3284 ripinterval(timer) 3285 int timer; 3286 { 3287 double r = rand(); 3288 3289 interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5)); 3290 nextalarm = time(NULL) + interval; 3291 return interval; 3292 } 3293 3294 time_t 3295 ripsuptrig() 3296 { 3297 time_t t; 3298 3299 double r = rand(); 3300 t = (int)(RIP_TRIG_INT6_MIN + 3301 (RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX)); 3302 sup_trig_update = time(NULL) + t; 3303 return t; 3304 } 3305 3306 void 3307 #ifdef __STDC__ 3308 fatal(const char *fmt, ...) 3309 #else 3310 fatal(fmt, va_alist) 3311 char *fmt; 3312 va_dcl 3313 #endif 3314 { 3315 va_list ap; 3316 char buf[1024]; 3317 3318 #ifdef __STDC__ 3319 va_start(ap, fmt); 3320 #else 3321 va_start(ap); 3322 #endif 3323 vsnprintf(buf, sizeof(buf), fmt, ap); 3324 perror(buf); 3325 syslog(LOG_ERR, "%s: %s", buf, strerror(errno)); 3326 rtdexit(); 3327 va_end(ap); 3328 } 3329 3330 void 3331 #ifdef __STDC__ 3332 tracet(int level, const char *fmt, ...) 3333 #else 3334 tracet(level, fmt, va_alist) 3335 int level; 3336 char *fmt; 3337 va_dcl 3338 #endif 3339 { 3340 va_list ap; 3341 3342 #ifdef __STDC__ 3343 va_start(ap, fmt); 3344 #else 3345 va_start(ap); 3346 #endif 3347 if (level <= dflag) { 3348 fprintf(stderr, "%s: ", hms()); 3349 vfprintf(stderr, fmt, ap); 3350 } 3351 if (dflag) { 3352 if (level > 0) 3353 vsyslog(LOG_DEBUG, fmt, ap); 3354 else 3355 vsyslog(LOG_WARNING, fmt, ap); 3356 } 3357 va_end(ap); 3358 } 3359 3360 void 3361 #ifdef __STDC__ 3362 trace(int level, const char *fmt, ...) 3363 #else 3364 trace(level, fmt, va_alist) 3365 int level; 3366 char *fmt; 3367 va_dcl 3368 #endif 3369 { 3370 va_list ap; 3371 3372 #ifdef __STDC__ 3373 va_start(ap, fmt); 3374 #else 3375 va_start(ap); 3376 #endif 3377 if (level <= dflag) 3378 vfprintf(stderr, fmt, ap); 3379 if (dflag) { 3380 if (level > 0) 3381 vsyslog(LOG_DEBUG, fmt, ap); 3382 else 3383 vsyslog(LOG_WARNING, fmt, ap); 3384 } 3385 va_end(ap); 3386 } 3387 3388 unsigned int 3389 if_maxindex() 3390 { 3391 struct if_nameindex *p, *p0; 3392 unsigned int max = 0; 3393 3394 p0 = if_nameindex(); 3395 for (p = p0; p && p->if_index && p->if_name; p++) { 3396 if (max < p->if_index) 3397 max = p->if_index; 3398 } 3399 if_freenameindex(p0); 3400 return max; 3401 } 3402 3403 struct ifc * 3404 ifc_find(name) 3405 char *name; 3406 { 3407 struct ifc *ifcp; 3408 3409 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 3410 if (strcmp(name, ifcp->ifc_name) == 0) 3411 return ifcp; 3412 } 3413 return (struct ifc *)NULL; 3414 } 3415 3416 struct iff * 3417 iff_find(ifcp, type) 3418 struct ifc *ifcp; 3419 int type; 3420 { 3421 struct iff *iffp; 3422 3423 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 3424 if (iffp->iff_type == type) 3425 return iffp; 3426 } 3427 return NULL; 3428 } 3429 3430 void 3431 setindex2ifc(idx, ifcp) 3432 int idx; 3433 struct ifc *ifcp; 3434 { 3435 int n; 3436 struct ifc **p; 3437 3438 if (!index2ifc) { 3439 nindex2ifc = 5; /*initial guess*/ 3440 index2ifc = (struct ifc **) 3441 malloc(sizeof(*index2ifc) * nindex2ifc); 3442 if (index2ifc == NULL) { 3443 fatal("malloc"); 3444 /*NOTREACHED*/ 3445 } 3446 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc); 3447 } 3448 n = nindex2ifc; 3449 while (nindex2ifc <= idx) 3450 nindex2ifc *= 2; 3451 if (n != nindex2ifc) { 3452 p = (struct ifc **)realloc(index2ifc, 3453 sizeof(*index2ifc) * nindex2ifc); 3454 if (p == NULL) { 3455 fatal("realloc"); 3456 /*NOTREACHED*/ 3457 } 3458 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n)); 3459 index2ifc = p; 3460 } 3461 index2ifc[idx] = ifcp; 3462 } 3463