1 /* $FreeBSD$ */ 2 /* $KAME: route6d.c,v 1.64 2001/05/08 04:36:37 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 static char _rcsid[] = "$KAME: route6d.c,v 1.64 2001/05/08 04:36:37 itojun Exp $"; 35 #endif 36 37 #include <stdio.h> 38 39 #include <time.h> 40 #include <unistd.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <signal.h> 44 #ifdef __STDC__ 45 #include <stdarg.h> 46 #else 47 #include <varargs.h> 48 #endif 49 #include <syslog.h> 50 #include <stddef.h> 51 #include <errno.h> 52 #include <err.h> 53 #ifdef HAVE_POLL_H 54 #include <poll.h> 55 #endif 56 57 #include <sys/types.h> 58 #include <sys/param.h> 59 #include <sys/file.h> 60 #include <sys/socket.h> 61 #include <sys/ioctl.h> 62 #include <sys/sysctl.h> 63 #include <sys/uio.h> 64 #include <net/if.h> 65 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 66 #include <net/if_var.h> 67 #endif /* __FreeBSD__ >= 3 */ 68 #define KERNEL 1 69 #define _KERNEL 1 70 #include <net/route.h> 71 #undef KERNEL 72 #undef _KERNEL 73 #include <netinet/in.h> 74 #include <netinet/in_var.h> 75 #include <netinet/ip6.h> 76 #include <netinet/udp.h> 77 #include <netdb.h> 78 #include <ifaddrs.h> 79 80 #include <arpa/inet.h> 81 82 #include "route6d.h" 83 84 #define MAXFILTER 40 85 86 #ifdef DEBUG 87 #define INIT_INTERVAL6 6 88 #else 89 #define INIT_INTERVAL6 10 /* Wait to submit an initial riprequest */ 90 #endif 91 92 /* alignment constraint for routing socket */ 93 #define ROUNDUP(a) \ 94 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 95 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 96 97 /* 98 * Following two macros are highly depending on KAME Release 99 */ 100 #define IN6_LINKLOCAL_IFINDEX(addr) \ 101 ((addr).s6_addr[2] << 8 | (addr).s6_addr[3]) 102 103 #define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \ 104 do { \ 105 (addr).s6_addr[2] = ((index) >> 8) & 0xff; \ 106 (addr).s6_addr[3] = (index) & 0xff; \ 107 } while (0) 108 109 struct ifc { /* Configuration of an interface */ 110 char *ifc_name; /* if name */ 111 struct ifc *ifc_next; 112 int ifc_index; /* if index */ 113 int ifc_mtu; /* if mtu */ 114 int ifc_metric; /* if metric */ 115 u_int ifc_flags; /* flags */ 116 short ifc_cflags; /* IFC_XXX */ 117 struct in6_addr ifc_mylladdr; /* my link-local address */ 118 struct sockaddr_in6 ifc_ripsin; /* rip multicast address */ 119 struct iff *ifc_filter; /* filter structure */ 120 struct ifac *ifc_addr; /* list of AF_INET6 addresses */ 121 int ifc_joined; /* joined to ff02::9 */ 122 }; 123 124 struct ifac { /* Adddress associated to an interface */ 125 struct ifc *ifa_conf; /* back pointer */ 126 struct ifac *ifa_next; 127 struct in6_addr ifa_addr; /* address */ 128 struct in6_addr ifa_raddr; /* remote address, valid in p2p */ 129 int ifa_plen; /* prefix length */ 130 }; 131 132 struct iff { 133 int iff_type; 134 struct in6_addr iff_addr; 135 int iff_plen; 136 struct iff *iff_next; 137 }; 138 139 struct ifc *ifc; 140 int nifc; /* number of valid ifc's */ 141 struct ifc **index2ifc; 142 int nindex2ifc; 143 struct ifc *loopifcp = NULL; /* pointing to loopback */ 144 #ifdef HAVE_POLL_H 145 struct pollfd set[2]; 146 #else 147 fd_set *sockvecp; /* vector to select() for receiving */ 148 fd_set *recvecp; 149 int fdmasks; 150 int maxfd; /* maximum fd for select() */ 151 #endif 152 int rtsock; /* the routing socket */ 153 int ripsock; /* socket to send/receive RIP datagram */ 154 155 struct rip6 *ripbuf; /* packet buffer for sending */ 156 157 /* 158 * Maintain the routes in a linked list. When the number of the routes 159 * grows, somebody would like to introduce a hash based or a radix tree 160 * based structure. I believe the number of routes handled by RIP is 161 * limited and I don't have to manage a complex data structure, however. 162 * 163 * One of the major drawbacks of the linear linked list is the difficulty 164 * of representing the relationship between a couple of routes. This may 165 * be a significant problem when we have to support route aggregation with 166 * supressing the specifices covered by the aggregate. 167 */ 168 169 struct riprt { 170 struct riprt *rrt_next; /* next destination */ 171 struct riprt *rrt_same; /* same destination - future use */ 172 struct netinfo6 rrt_info; /* network info */ 173 struct in6_addr rrt_gw; /* gateway */ 174 u_long rrt_flags; /* kernel routing table flags */ 175 u_long rrt_rflags; /* route6d routing table flags */ 176 time_t rrt_t; /* when the route validated */ 177 int rrt_index; /* ifindex from which this route got */ 178 }; 179 180 struct riprt *riprt = 0; 181 182 int dflag = 0; /* debug flag */ 183 int qflag = 0; /* quiet flag */ 184 int nflag = 0; /* don't update kernel routing table */ 185 int aflag = 0; /* age out even the statically defined routes */ 186 int hflag = 0; /* don't split horizon */ 187 int lflag = 0; /* exchange site local routes */ 188 int sflag = 0; /* announce static routes w/ split horizon */ 189 int Sflag = 0; /* announce static routes to every interface */ 190 unsigned long routetag = 0; /* route tag attached on originating case */ 191 192 char *filter[MAXFILTER]; 193 int filtertype[MAXFILTER]; 194 int nfilter = 0; 195 196 pid_t pid; 197 198 struct sockaddr_storage ripsin; 199 200 struct rtentry rtentry; 201 202 int interval = 1; 203 time_t nextalarm = 0; 204 time_t sup_trig_update = 0; 205 206 FILE *rtlog = NULL; 207 208 int logopened = 0; 209 210 static u_long seq = 0; 211 212 volatile sig_atomic_t seenalrm; 213 volatile sig_atomic_t seenquit; 214 volatile sig_atomic_t seenusr1; 215 216 #define RRTF_AGGREGATE 0x08000000 217 #define RRTF_NOADVERTISE 0x10000000 218 #define RRTF_NH_NOT_LLADDR 0x20000000 219 #define RRTF_SENDANYWAY 0x40000000 220 #define RRTF_CHANGED 0x80000000 221 222 int main __P((int, char **)); 223 void sighandler __P((int)); 224 void ripalarm __P((void)); 225 void riprecv __P((void)); 226 void ripsend __P((struct ifc *, struct sockaddr_in6 *, int)); 227 int out_filter __P((struct riprt *, struct ifc *)); 228 void init __P((void)); 229 void sockopt __P((struct ifc *)); 230 void ifconfig __P((void)); 231 void ifconfig1 __P((const char *, const struct sockaddr *, struct ifc *, int)); 232 void rtrecv __P((void)); 233 int rt_del __P((const struct sockaddr_in6 *, const struct sockaddr_in6 *, 234 const struct sockaddr_in6 *)); 235 int rt_deladdr __P((struct ifc *, const struct sockaddr_in6 *, 236 const struct sockaddr_in6 *)); 237 void filterconfig __P((void)); 238 int getifmtu __P((int)); 239 const char *rttypes __P((struct rt_msghdr *)); 240 const char *rtflags __P((struct rt_msghdr *)); 241 const char *ifflags __P((int)); 242 int ifrt __P((struct ifc *, int)); 243 void ifrt_p2p __P((struct ifc *, int)); 244 void applymask __P((struct in6_addr *, struct in6_addr *)); 245 void applyplen __P((struct in6_addr *, int)); 246 void ifrtdump __P((int)); 247 void ifdump __P((int)); 248 void ifdump0 __P((FILE *, const struct ifc *)); 249 void rtdump __P((int)); 250 void rt_entry __P((struct rt_msghdr *, int)); 251 void rtdexit __P((void)); 252 void riprequest __P((struct ifc *, struct netinfo6 *, int, 253 struct sockaddr_in6 *)); 254 void ripflush __P((struct ifc *, struct sockaddr_in6 *)); 255 void sendrequest __P((struct ifc *)); 256 int sin6mask2len __P((const struct sockaddr_in6 *)); 257 int mask2len __P((const struct in6_addr *, int)); 258 int sendpacket __P((struct sockaddr_in6 *, int)); 259 int addroute __P((struct riprt *, const struct in6_addr *, struct ifc *)); 260 int delroute __P((struct netinfo6 *, struct in6_addr *)); 261 struct in6_addr *getroute __P((struct netinfo6 *, struct in6_addr *)); 262 void krtread __P((int)); 263 int tobeadv __P((struct riprt *, struct ifc *)); 264 char *allocopy __P((char *)); 265 char *hms __P((void)); 266 const char *inet6_n2p __P((const struct in6_addr *)); 267 struct ifac *ifa_match __P((const struct ifc *, const struct in6_addr *, int)); 268 struct in6_addr *plen2mask __P((int)); 269 struct riprt *rtsearch __P((struct netinfo6 *, struct riprt **)); 270 int ripinterval __P((int)); 271 time_t ripsuptrig __P((void)); 272 void fatal __P((const char *, ...)) 273 __attribute__((__format__(__printf__, 1, 2))); 274 void trace __P((int, const char *, ...)) 275 __attribute__((__format__(__printf__, 2, 3))); 276 void tracet __P((int, const char *, ...)) 277 __attribute__((__format__(__printf__, 2, 3))); 278 unsigned int if_maxindex __P((void)); 279 struct ifc *ifc_find __P((char *)); 280 struct iff *iff_find __P((struct ifc *, int)); 281 void setindex2ifc __P((int, struct ifc *)); 282 283 #define MALLOC(type) ((type *)malloc(sizeof(type))) 284 285 int 286 main(argc, argv) 287 int argc; 288 char **argv; 289 { 290 int ch; 291 int error = 0; 292 struct ifc *ifcp; 293 sigset_t mask, omask; 294 FILE *pidfile; 295 char *progname; 296 char *ep; 297 298 progname = strrchr(*argv, '/'); 299 if (progname) 300 progname++; 301 else 302 progname = *argv; 303 304 pid = getpid(); 305 while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) { 306 switch (ch) { 307 case 'A': 308 case 'N': 309 case 'O': 310 case 'T': 311 case 'L': 312 if (nfilter >= MAXFILTER) { 313 fatal("Exceeds MAXFILTER"); 314 /*NOTREACHED*/ 315 } 316 filtertype[nfilter] = ch; 317 filter[nfilter++] = allocopy(optarg); 318 break; 319 case 't': 320 ep = NULL; 321 routetag = strtoul(optarg, &ep, 0); 322 if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) { 323 fatal("invalid route tag"); 324 /*NOTREACHED*/ 325 } 326 break; 327 case 'R': 328 if ((rtlog = fopen(optarg, "w")) == NULL) { 329 fatal("Can not write to routelog"); 330 /*NOTREACHED*/ 331 } 332 break; 333 #define FLAG(c, flag, n) case c: do { flag = n; break; } while(0) 334 FLAG('a', aflag, 1); break; 335 FLAG('d', dflag, 1); break; 336 FLAG('D', dflag, 2); break; 337 FLAG('h', hflag, 1); break; 338 FLAG('l', lflag, 1); break; 339 FLAG('n', nflag, 1); break; 340 FLAG('q', qflag, 1); break; 341 FLAG('s', sflag, 1); break; 342 FLAG('S', Sflag, 1); break; 343 #undef FLAG 344 default: 345 fatal("Invalid option specified, terminating"); 346 /*NOTREACHED*/ 347 } 348 } 349 argc -= optind; 350 argv += optind; 351 if (argc > 0) { 352 fatal("bogus extra arguments"); 353 /*NOTREACHED*/ 354 } 355 356 if (geteuid()) { 357 nflag = 1; 358 fprintf(stderr, "No kernel update is allowed\n"); 359 } 360 361 if (dflag == 0) { 362 if (daemon(0, 0) < 0) { 363 fatal("daemon"); 364 /*NOTREACHED*/ 365 } 366 } 367 368 openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON); 369 logopened++; 370 371 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) 372 fatal("malloc"); 373 memset(ripbuf, 0, RIP6_MAXMTU); 374 ripbuf->rip6_cmd = RIP6_RESPONSE; 375 ripbuf->rip6_vers = RIP6_VERSION; 376 ripbuf->rip6_res1[0] = 0; 377 ripbuf->rip6_res1[1] = 0; 378 379 init(); 380 ifconfig(); 381 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 382 if (ifcp->ifc_index < 0) { 383 fprintf(stderr, 384 "No ifindex found at %s (no link-local address?)\n", 385 ifcp->ifc_name); 386 error++; 387 } 388 } 389 if (error) 390 exit(1); 391 if (loopifcp == NULL) { 392 fatal("No loopback found"); 393 /*NOTREACHED*/ 394 } 395 #ifdef __FreeBSD__ 396 sranddev(); 397 #else 398 srand((unsigned)(time(NULL)^(pid<<16))); 399 #endif 400 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 401 ifrt(ifcp, 0); 402 filterconfig(); 403 krtread(0); 404 if (dflag) 405 ifrtdump(0); 406 407 pid = getpid(); 408 if ((pidfile = fopen(ROUTE6D_PID, "w")) != NULL) { 409 fprintf(pidfile, "%d\n", pid); 410 fclose(pidfile); 411 } 412 413 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) { 414 fatal("malloc"); 415 /*NOTREACHED*/ 416 } 417 memset(ripbuf, 0, RIP6_MAXMTU); 418 ripbuf->rip6_cmd = RIP6_RESPONSE; 419 ripbuf->rip6_vers = RIP6_VERSION; 420 ripbuf->rip6_res1[0] = 0; 421 ripbuf->rip6_res1[1] = 0; 422 423 if (signal(SIGALRM, sighandler) == SIG_ERR || 424 signal(SIGQUIT, sighandler) == SIG_ERR || 425 signal(SIGTERM, sighandler) == SIG_ERR || 426 signal(SIGUSR1, sighandler) == SIG_ERR || 427 signal(SIGHUP, sighandler) == SIG_ERR || 428 signal(SIGINT, sighandler) == SIG_ERR) { 429 fatal("signal"); 430 /*NOTREACHED*/ 431 } 432 /* 433 * To avoid rip packet congestion (not on a cable but in this 434 * process), wait for a moment to send the first RIP6_RESPONSE 435 * packets. 436 */ 437 alarm(ripinterval(INIT_INTERVAL6)); 438 439 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 440 if (iff_find(ifcp, 'N')) 441 continue; 442 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 443 sendrequest(ifcp); 444 } 445 446 syslog(LOG_INFO, "**** Started ****"); 447 sigemptyset(&mask); 448 sigaddset(&mask, SIGALRM); 449 while (1) { 450 if (seenalrm) { 451 ripalarm(); 452 seenalrm = 0; 453 continue; 454 } 455 if (seenquit) { 456 rtdexit(); 457 seenquit = 0; 458 continue; 459 } 460 if (seenusr1) { 461 ifrtdump(SIGUSR1); 462 seenusr1 = 0; 463 continue; 464 } 465 466 #ifdef HAVE_POLL_H 467 switch (poll(set, 2, INFTIM)) 468 #else 469 memcpy(recvecp, sockvecp, fdmasks); 470 switch (select(maxfd + 1, recvecp, 0, 0, 0)) 471 #endif 472 { 473 case -1: 474 if (errno != EINTR) { 475 fatal("select"); 476 /*NOTREACHED*/ 477 } 478 continue; 479 case 0: 480 continue; 481 default: 482 #ifdef HAVE_POLL_H 483 if (set[0].revents & POLLIN) 484 #else 485 if (FD_ISSET(ripsock, recvecp)) 486 #endif 487 { 488 sigprocmask(SIG_BLOCK, &mask, &omask); 489 riprecv(); 490 sigprocmask(SIG_SETMASK, &omask, NULL); 491 } 492 #ifdef HAVE_POLL_H 493 if (set[1].revents & POLLIN) 494 #else 495 if (FD_ISSET(rtsock, recvecp)) 496 #endif 497 { 498 sigprocmask(SIG_BLOCK, &mask, &omask); 499 rtrecv(); 500 sigprocmask(SIG_SETMASK, &omask, NULL); 501 } 502 } 503 } 504 } 505 506 void 507 sighandler(signo) 508 int signo; 509 { 510 511 switch (signo) { 512 case SIGALRM: 513 seenalrm++; 514 break; 515 case SIGQUIT: 516 case SIGTERM: 517 seenquit++; 518 break; 519 case SIGUSR1: 520 case SIGHUP: 521 case SIGINT: 522 seenusr1++; 523 break; 524 } 525 } 526 527 /* 528 * gracefully exits after resetting sockopts. 529 */ 530 /* ARGSUSED */ 531 void 532 rtdexit() 533 { 534 struct riprt *rrt; 535 536 alarm(0); 537 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 538 if (rrt->rrt_rflags & RRTF_AGGREGATE) { 539 delroute(&rrt->rrt_info, &rrt->rrt_gw); 540 } 541 } 542 close(ripsock); 543 close(rtsock); 544 syslog(LOG_INFO, "**** Terminated ****"); 545 closelog(); 546 exit(1); 547 } 548 549 /* 550 * Called periodically: 551 * 1. age out the learned route. remove it if necessary. 552 * 2. submit RIP6_RESPONSE packets. 553 * Invoked in every SUPPLY_INTERVAL6 (30) seconds. I believe we don't have 554 * to invoke this function in every 1 or 5 or 10 seconds only to age the 555 * routes more precisely. 556 */ 557 /* ARGSUSED */ 558 void 559 ripalarm() 560 { 561 struct ifc *ifcp; 562 struct riprt *rrt, *rrt_prev, *rrt_next; 563 time_t t_lifetime, t_holddown; 564 565 /* age the RIP routes */ 566 rrt_prev = 0; 567 t_lifetime = time(NULL) - RIP_LIFETIME; 568 t_holddown = t_lifetime - RIP_HOLDDOWN; 569 for (rrt = riprt; rrt; rrt = rrt_next) { 570 rrt_next = rrt->rrt_next; 571 572 if (rrt->rrt_t == 0) { 573 rrt_prev = rrt; 574 continue; 575 } 576 if (rrt->rrt_t < t_holddown) { 577 if (rrt_prev) { 578 rrt_prev->rrt_next = rrt->rrt_next; 579 } else { 580 riprt = rrt->rrt_next; 581 } 582 delroute(&rrt->rrt_info, &rrt->rrt_gw); 583 free(rrt); 584 continue; 585 } 586 if (rrt->rrt_t < t_lifetime) 587 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 588 rrt_prev = rrt; 589 } 590 /* Supply updates */ 591 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 592 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 593 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 594 } 595 alarm(ripinterval(SUPPLY_INTERVAL6)); 596 } 597 598 void 599 init() 600 { 601 int error; 602 const int int0 = 0, int1 = 1, int255 = 255; 603 struct addrinfo hints, *res; 604 char port[NI_MAXSERV]; 605 606 ifc = (struct ifc *)NULL; 607 nifc = 0; 608 nindex2ifc = 0; /*initial guess*/ 609 index2ifc = NULL; 610 snprintf(port, sizeof(port), "%u", RIP6_PORT); 611 612 memset(&hints, 0, sizeof(hints)); 613 hints.ai_family = PF_INET6; 614 hints.ai_socktype = SOCK_DGRAM; 615 hints.ai_protocol = IPPROTO_UDP; 616 hints.ai_flags = AI_PASSIVE; 617 error = getaddrinfo(NULL, port, &hints, &res); 618 if (error) { 619 fatal("%s", gai_strerror(error)); 620 /*NOTREACHED*/ 621 } 622 if (res->ai_next) { 623 fatal(":: resolved to multiple address"); 624 /*NOTREACHED*/ 625 } 626 627 ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 628 if (ripsock < 0) { 629 fatal("rip socket"); 630 /*NOTREACHED*/ 631 } 632 #ifdef IPV6_V6ONLY 633 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_V6ONLY, 634 &int1, sizeof(int1)) < 0) { 635 fatal("rip IPV6_V6ONLY"); 636 /*NOTREACHED*/ 637 } 638 #endif 639 if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) { 640 fatal("rip bind"); 641 /*NOTREACHED*/ 642 } 643 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 644 &int255, sizeof(int255)) < 0) { 645 fatal("rip IPV6_MULTICAST_HOPS"); 646 /*NOTREACHED*/ 647 } 648 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, 649 &int0, sizeof(int0)) < 0) { 650 fatal("rip IPV6_MULTICAST_LOOP"); 651 /*NOTREACHED*/ 652 } 653 654 #ifdef IPV6_RECVPKTINFO 655 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, 656 &int1, sizeof(int1)) < 0) { 657 fatal("rip IPV6_RECVPKTINFO"); 658 /*NOTREACHED*/ 659 } 660 #else /* old adv. API */ 661 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, 662 &int1, sizeof(int1)) < 0) { 663 fatal("rip IPV6_PKTINFO"); 664 /*NOTREACHED*/ 665 } 666 #endif 667 668 memset(&hints, 0, sizeof(hints)); 669 hints.ai_family = PF_INET6; 670 hints.ai_socktype = SOCK_DGRAM; 671 hints.ai_protocol = IPPROTO_UDP; 672 error = getaddrinfo(RIP6_DEST, port, &hints, &res); 673 if (error) { 674 fatal("%s", gai_strerror(error)); 675 /*NOTREACHED*/ 676 } 677 if (res->ai_next) { 678 fatal("%s resolved to multiple address", RIP6_DEST); 679 /*NOTREACHED*/ 680 } 681 memcpy(&ripsin, res->ai_addr, res->ai_addrlen); 682 683 #ifdef HAVE_POLL_H 684 set[0].fd = ripsock; 685 set[0].events = POLLIN; 686 #else 687 maxfd = ripsock; 688 #endif 689 690 if (nflag == 0) { 691 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) { 692 fatal("route socket"); 693 /*NOTREACHED*/ 694 } 695 #ifdef HAVE_POLL_H 696 set[1].fd = rtsock; 697 set[1].events = POLLIN; 698 #else 699 if (rtsock > maxfd) 700 maxfd = rtsock; 701 #endif 702 } else { 703 #ifdef HAVE_POLL_H 704 set[1].fd = -1; 705 #else 706 rtsock = -1; /*just for safety */ 707 #endif 708 } 709 710 #ifndef HAVE_POLL_H 711 fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask); 712 if ((sockvecp = malloc(fdmasks)) == NULL) { 713 fatal("malloc"); 714 /*NOTREACHED*/ 715 } 716 if ((recvecp = malloc(fdmasks)) == NULL) { 717 fatal("malloc"); 718 /*NOTREACHED*/ 719 } 720 memset(sockvecp, 0, fdmasks); 721 FD_SET(ripsock, sockvecp); 722 if (rtsock >= 0) 723 FD_SET(rtsock, sockvecp); 724 #endif 725 } 726 727 #define RIPSIZE(n) \ 728 (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6)) 729 730 /* 731 * ripflush flushes the rip datagram stored in the rip buffer 732 */ 733 static int nrt; 734 static struct netinfo6 *np; 735 736 void 737 ripflush(ifcp, sin6) 738 struct ifc *ifcp; 739 struct sockaddr_in6 *sin6; 740 { 741 int i; 742 int error; 743 744 if (ifcp) 745 tracet(1, "Send(%s): info(%d) to %s.%d\n", 746 ifcp->ifc_name, nrt, 747 inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port)); 748 else 749 tracet(1, "Send: info(%d) to %s.%d\n", 750 nrt, inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port)); 751 if (dflag >= 2) { 752 np = ripbuf->rip6_nets; 753 for (i = 0; i < nrt; i++, np++) { 754 if (np->rip6_metric == NEXTHOP_METRIC) { 755 if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) 756 trace(2, " NextHop reset"); 757 else { 758 trace(2, " NextHop %s", 759 inet6_n2p(&np->rip6_dest)); 760 } 761 } else { 762 trace(2, " %s/%d[%d]", 763 inet6_n2p(&np->rip6_dest), 764 np->rip6_plen, np->rip6_metric); 765 } 766 if (np->rip6_tag) { 767 trace(2, " tag=0x%04x", 768 ntohs(np->rip6_tag) & 0xffff); 769 } 770 trace(2, "\n"); 771 } 772 } 773 error = sendpacket(sin6, RIPSIZE(nrt)); 774 if (error == EAFNOSUPPORT) { 775 /* Protocol not supported */ 776 tracet(1, "Could not send info to %s (%s): " 777 "set IFF_UP to 0\n", 778 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 779 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 780 } 781 nrt = 0; np = ripbuf->rip6_nets; 782 } 783 784 /* 785 * Generate RIP6_RESPONSE packets and send them. 786 */ 787 void 788 ripsend(ifcp, sin6, flag) 789 struct ifc *ifcp; 790 struct sockaddr_in6 *sin6; 791 int flag; 792 { 793 struct riprt *rrt; 794 struct in6_addr *nh; /* next hop */ 795 int maxrte; 796 797 if (ifcp == NULL) { 798 /* 799 * Request from non-link local address is not 800 * a regular route6d update. 801 */ 802 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) - 803 sizeof(struct udphdr) - 804 sizeof(struct rip6) + sizeof(struct netinfo6)) / 805 sizeof(struct netinfo6); 806 nrt = 0; np = ripbuf->rip6_nets; nh = NULL; 807 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 808 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 809 continue; 810 /* Put the route to the buffer */ 811 *np = rrt->rrt_info; 812 np++; nrt++; 813 if (nrt == maxrte) { 814 ripflush(NULL, sin6); 815 nh = NULL; 816 } 817 } 818 if (nrt) /* Send last packet */ 819 ripflush(NULL, sin6); 820 return; 821 } 822 823 if ((flag & RRTF_SENDANYWAY) == 0 && 824 (qflag || (ifcp->ifc_flags & IFF_LOOPBACK))) 825 return; 826 827 /* -N: no use */ 828 if (iff_find(ifcp, 'N') != NULL) 829 return; 830 831 /* -T: generate default route only */ 832 if (iff_find(ifcp, 'T') != NULL) { 833 struct netinfo6 rrt_info; 834 memset(&rrt_info, 0, sizeof(struct netinfo6)); 835 rrt_info.rip6_dest = in6addr_any; 836 rrt_info.rip6_plen = 0; 837 rrt_info.rip6_metric = 1; 838 rrt_info.rip6_metric += ifcp->ifc_metric; 839 rrt_info.rip6_tag = htons(routetag & 0xffff); 840 np = ripbuf->rip6_nets; 841 *np = rrt_info; 842 nrt = 1; 843 ripflush(ifcp, sin6); 844 return; 845 } 846 847 maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) - 848 sizeof(struct udphdr) - 849 sizeof(struct rip6) + sizeof(struct netinfo6)) / 850 sizeof(struct netinfo6); 851 852 nrt = 0; np = ripbuf->rip6_nets; nh = NULL; 853 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 854 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 855 continue; 856 857 /* Need to check filter here */ 858 if (out_filter(rrt, ifcp) == 0) 859 continue; 860 861 /* Check split horizon and other conditions */ 862 if (tobeadv(rrt, ifcp) == 0) 863 continue; 864 865 /* Only considers the routes with flag if specified */ 866 if ((flag & RRTF_CHANGED) && 867 (rrt->rrt_rflags & RRTF_CHANGED) == 0) 868 continue; 869 870 /* Check nexthop */ 871 if (rrt->rrt_index == ifcp->ifc_index && 872 !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) && 873 (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) { 874 if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) { 875 if (nrt == maxrte - 2) 876 ripflush(ifcp, sin6); 877 np->rip6_dest = rrt->rrt_gw; 878 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) 879 SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0); 880 np->rip6_plen = 0; 881 np->rip6_tag = 0; 882 np->rip6_metric = NEXTHOP_METRIC; 883 nh = &rrt->rrt_gw; 884 np++; nrt++; 885 } 886 } else if (nh && (rrt->rrt_index != ifcp->ifc_index || 887 !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) || 888 rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) { 889 /* Reset nexthop */ 890 if (nrt == maxrte - 2) 891 ripflush(ifcp, sin6); 892 memset(np, 0, sizeof(struct netinfo6)); 893 np->rip6_metric = NEXTHOP_METRIC; 894 nh = NULL; 895 np++; nrt++; 896 } 897 898 /* Put the route to the buffer */ 899 *np = rrt->rrt_info; 900 np++; nrt++; 901 if (nrt == maxrte) { 902 ripflush(ifcp, sin6); 903 nh = NULL; 904 } 905 } 906 if (nrt) /* Send last packet */ 907 ripflush(ifcp, sin6); 908 } 909 910 /* 911 * outbound filter logic, per-route/interface. 912 */ 913 int 914 out_filter(rrt, ifcp) 915 struct riprt *rrt; 916 struct ifc *ifcp; 917 { 918 struct iff *iffp; 919 struct in6_addr ia; 920 int ok; 921 922 /* 923 * -A: filter out less specific routes, if we have aggregated 924 * route configured. 925 */ 926 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 927 if (iffp->iff_type != 'A') 928 continue; 929 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen) 930 continue; 931 ia = rrt->rrt_info.rip6_dest; 932 applyplen(&ia, iffp->iff_plen); 933 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) 934 return 0; 935 } 936 937 /* 938 * if it is an aggregated route, advertise it only to the 939 * interfaces specified on -A. 940 */ 941 if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) { 942 ok = 0; 943 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 944 if (iffp->iff_type != 'A') 945 continue; 946 if (rrt->rrt_info.rip6_plen == iffp->iff_plen && 947 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 948 &iffp->iff_addr)) { 949 ok = 1; 950 break; 951 } 952 } 953 if (!ok) 954 return 0; 955 } 956 957 /* 958 * -O: advertise only if prefix matches the configured prefix. 959 */ 960 if (iff_find(ifcp, 'O')) { 961 ok = 0; 962 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 963 if (iffp->iff_type != 'O') 964 continue; 965 if (rrt->rrt_info.rip6_plen < iffp->iff_plen) 966 continue; 967 ia = rrt->rrt_info.rip6_dest; 968 applyplen(&ia, iffp->iff_plen); 969 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 970 ok = 1; 971 break; 972 } 973 } 974 if (!ok) 975 return 0; 976 } 977 978 /* the prefix should be advertised */ 979 return 1; 980 } 981 982 /* 983 * Determine if the route is to be advertised on the specified interface. 984 * It checks options specified in the arguments and the split horizon rule. 985 */ 986 int 987 tobeadv(rrt, ifcp) 988 struct riprt *rrt; 989 struct ifc *ifcp; 990 { 991 992 /* Special care for static routes */ 993 if (rrt->rrt_flags & RTF_STATIC) { 994 /* XXX don't advertise reject/blackhole routes */ 995 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE)) 996 return 0; 997 998 if (Sflag) /* Yes, advertise it anyway */ 999 return 1; 1000 if (sflag && rrt->rrt_index != ifcp->ifc_index) 1001 return 1; 1002 return 0; 1003 } 1004 /* Regular split horizon */ 1005 if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index) 1006 return 0; 1007 return 1; 1008 } 1009 1010 /* 1011 * Send a rip packet actually. 1012 */ 1013 int 1014 sendpacket(sin6, len) 1015 struct sockaddr_in6 *sin6; 1016 int len; 1017 { 1018 /* 1019 * MSG_DONTROUTE should not be specified when it responds with a 1020 * RIP6_REQUEST message. SO_DONTROUTE has been specified to 1021 * other sockets. 1022 */ 1023 struct msghdr m; 1024 struct cmsghdr *cm; 1025 struct iovec iov[2]; 1026 u_char cmsgbuf[256]; 1027 struct in6_pktinfo *pi; 1028 int idx; 1029 struct sockaddr_in6 sincopy; 1030 1031 /* do not overwrite the given sin */ 1032 sincopy = *sin6; 1033 sin6 = &sincopy; 1034 1035 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) || 1036 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 1037 idx = IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr); 1038 SET_IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr, 0); 1039 } else 1040 idx = 0; 1041 1042 m.msg_name = (caddr_t)sin6; 1043 m.msg_namelen = sizeof(*sin6); 1044 iov[0].iov_base = (caddr_t)ripbuf; 1045 iov[0].iov_len = len; 1046 m.msg_iov = iov; 1047 m.msg_iovlen = 1; 1048 if (!idx) { 1049 m.msg_control = NULL; 1050 m.msg_controllen = 0; 1051 } else { 1052 memset(cmsgbuf, 0, sizeof(cmsgbuf)); 1053 cm = (struct cmsghdr *)cmsgbuf; 1054 m.msg_control = (caddr_t)cm; 1055 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); 1056 1057 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 1058 cm->cmsg_level = IPPROTO_IPV6; 1059 cm->cmsg_type = IPV6_PKTINFO; 1060 pi = (struct in6_pktinfo *)CMSG_DATA(cm); 1061 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/ 1062 pi->ipi6_ifindex = idx; 1063 } 1064 1065 if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) { 1066 trace(1, "sendmsg: %s\n", strerror(errno)); 1067 return errno; 1068 } 1069 1070 return 0; 1071 } 1072 1073 /* 1074 * Receive and process RIP packets. Update the routes/kernel forwarding 1075 * table if necessary. 1076 */ 1077 void 1078 riprecv() 1079 { 1080 struct ifc *ifcp, *ic; 1081 struct sockaddr_in6 fsock; 1082 struct in6_addr nh; /* next hop */ 1083 struct rip6 *rp; 1084 struct netinfo6 *np, *nq; 1085 struct riprt *rrt; 1086 int len, nn, need_trigger, idx; 1087 char buf[4 * RIP6_MAXMTU]; 1088 time_t t; 1089 struct msghdr m; 1090 struct cmsghdr *cm; 1091 struct iovec iov[2]; 1092 u_char cmsgbuf[256]; 1093 struct in6_pktinfo *pi; 1094 struct iff *iffp; 1095 struct in6_addr ia; 1096 int ok; 1097 time_t t_half_lifetime; 1098 1099 need_trigger = 0; 1100 1101 m.msg_name = (caddr_t)&fsock; 1102 m.msg_namelen = sizeof(fsock); 1103 iov[0].iov_base = (caddr_t)buf; 1104 iov[0].iov_len = sizeof(buf); 1105 m.msg_iov = iov; 1106 m.msg_iovlen = 1; 1107 cm = (struct cmsghdr *)cmsgbuf; 1108 m.msg_control = (caddr_t)cm; 1109 m.msg_controllen = sizeof(cmsgbuf); 1110 if ((len = recvmsg(ripsock, &m, 0)) < 0) { 1111 fatal("recvmsg"); 1112 /*NOTREACHED*/ 1113 } 1114 idx = 0; 1115 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m); 1116 cm; 1117 cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) { 1118 if (cm->cmsg_level == IPPROTO_IPV6 && 1119 cm->cmsg_type == IPV6_PKTINFO) { 1120 pi = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1121 idx = pi->ipi6_ifindex; 1122 break; 1123 } 1124 } 1125 if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) 1126 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx); 1127 1128 nh = fsock.sin6_addr; 1129 nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) / 1130 sizeof(struct netinfo6); 1131 rp = (struct rip6 *)buf; 1132 np = rp->rip6_nets; 1133 1134 if (rp->rip6_vers != RIP6_VERSION) { 1135 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers); 1136 return; 1137 } 1138 if (rp->rip6_cmd == RIP6_REQUEST) { 1139 if (idx && idx < nindex2ifc) { 1140 ifcp = index2ifc[idx]; 1141 riprequest(ifcp, np, nn, &fsock); 1142 } else { 1143 riprequest(NULL, np, nn, &fsock); 1144 } 1145 return; 1146 } 1147 1148 if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) { 1149 trace(1, "Packets from non-ll addr: %s\n", 1150 inet6_n2p(&fsock.sin6_addr)); 1151 return; /* Ignore packets from non-link-local addr */ 1152 } 1153 idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr); 1154 ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL; 1155 if (!ifcp) { 1156 trace(1, "Packets to unknown interface index %d\n", idx); 1157 return; /* Ignore it */ 1158 } 1159 if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr)) 1160 return; /* The packet is from me; ignore */ 1161 if (rp->rip6_cmd != RIP6_RESPONSE) { 1162 trace(1, "Invalid command %d\n", rp->rip6_cmd); 1163 return; 1164 } 1165 1166 /* -N: no use */ 1167 if (iff_find(ifcp, 'N') != NULL) 1168 return; 1169 1170 tracet(1, "Recv(%s): from %s.%d info(%d)\n", 1171 ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn); 1172 1173 t = time(NULL); 1174 t_half_lifetime = t - (RIP_LIFETIME/2); 1175 for (; nn; nn--, np++) { 1176 if (np->rip6_metric == NEXTHOP_METRIC) { 1177 /* modify neighbor address */ 1178 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1179 nh = np->rip6_dest; 1180 SET_IN6_LINKLOCAL_IFINDEX(nh, idx); 1181 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1182 } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) { 1183 nh = fsock.sin6_addr; 1184 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1185 } else { 1186 nh = fsock.sin6_addr; 1187 trace(1, "\tInvalid Nexthop: %s\n", 1188 inet6_n2p(&np->rip6_dest)); 1189 } 1190 continue; 1191 } 1192 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) { 1193 trace(1, "\tMulticast netinfo6: %s/%d [%d]\n", 1194 inet6_n2p(&np->rip6_dest), 1195 np->rip6_plen, np->rip6_metric); 1196 continue; 1197 } 1198 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) { 1199 trace(1, "\tLoopback netinfo6: %s/%d [%d]\n", 1200 inet6_n2p(&np->rip6_dest), 1201 np->rip6_plen, np->rip6_metric); 1202 continue; 1203 } 1204 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1205 trace(1, "\tLink Local netinfo6: %s/%d [%d]\n", 1206 inet6_n2p(&np->rip6_dest), 1207 np->rip6_plen, np->rip6_metric); 1208 continue; 1209 } 1210 /* may need to pass sitelocal prefix in some case, however*/ 1211 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) { 1212 trace(1, "\tSite Local netinfo6: %s/%d [%d]\n", 1213 inet6_n2p(&np->rip6_dest), 1214 np->rip6_plen, np->rip6_metric); 1215 continue; 1216 } 1217 trace(2, "\tnetinfo6: %s/%d [%d]", 1218 inet6_n2p(&np->rip6_dest), 1219 np->rip6_plen, np->rip6_metric); 1220 if (np->rip6_tag) 1221 trace(2, " tag=0x%04x", ntohs(np->rip6_tag) & 0xffff); 1222 if (dflag >= 2) { 1223 ia = np->rip6_dest; 1224 applyplen(&ia, np->rip6_plen); 1225 if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest)) 1226 trace(2, " [junk outside prefix]"); 1227 } 1228 1229 /* 1230 * -L: listen only if the prefix matches the configuration 1231 */ 1232 ok = 1; /* if there's no L filter, it is ok */ 1233 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 1234 if (iffp->iff_type != 'L') 1235 continue; 1236 ok = 0; 1237 if (np->rip6_plen < iffp->iff_plen) 1238 continue; 1239 /* special rule: ::/0 means default, not "in /0" */ 1240 if (iffp->iff_plen == 0 && np->rip6_plen > 0) 1241 continue; 1242 ia = np->rip6_dest; 1243 applyplen(&ia, iffp->iff_plen); 1244 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 1245 ok = 1; 1246 break; 1247 } 1248 } 1249 if (!ok) { 1250 trace(2, " (filtered)\n"); 1251 continue; 1252 } 1253 1254 trace(2, "\n"); 1255 np->rip6_metric++; 1256 np->rip6_metric += ifcp->ifc_metric; 1257 if (np->rip6_metric > HOPCNT_INFINITY6) 1258 np->rip6_metric = HOPCNT_INFINITY6; 1259 1260 applyplen(&np->rip6_dest, np->rip6_plen); 1261 if ((rrt = rtsearch(np, NULL)) != NULL) { 1262 if (rrt->rrt_t == 0) 1263 continue; /* Intf route has priority */ 1264 nq = &rrt->rrt_info; 1265 if (nq->rip6_metric > np->rip6_metric) { 1266 if (rrt->rrt_index == ifcp->ifc_index && 1267 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1268 /* Small metric from the same gateway */ 1269 nq->rip6_metric = np->rip6_metric; 1270 } else { 1271 /* Better route found */ 1272 rrt->rrt_index = ifcp->ifc_index; 1273 /* Update routing table */ 1274 delroute(nq, &rrt->rrt_gw); 1275 rrt->rrt_gw = nh; 1276 *nq = *np; 1277 addroute(rrt, &nh, ifcp); 1278 } 1279 rrt->rrt_rflags |= RRTF_CHANGED; 1280 rrt->rrt_t = t; 1281 need_trigger = 1; 1282 } else if (nq->rip6_metric < np->rip6_metric && 1283 rrt->rrt_index == ifcp->ifc_index && 1284 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1285 /* Got worse route from same gw */ 1286 nq->rip6_metric = np->rip6_metric; 1287 rrt->rrt_t = t; 1288 rrt->rrt_rflags |= RRTF_CHANGED; 1289 need_trigger = 1; 1290 } else if (nq->rip6_metric == np->rip6_metric && 1291 np->rip6_metric < HOPCNT_INFINITY6) { 1292 if (rrt->rrt_index == ifcp->ifc_index && 1293 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1294 /* same metric, same route from same gw */ 1295 rrt->rrt_t = t; 1296 } else if (rrt->rrt_t < t_half_lifetime) { 1297 /* Better route found */ 1298 rrt->rrt_index = ifcp->ifc_index; 1299 /* Update routing table */ 1300 delroute(nq, &rrt->rrt_gw); 1301 rrt->rrt_gw = nh; 1302 *nq = *np; 1303 addroute(rrt, &nh, ifcp); 1304 rrt->rrt_rflags |= RRTF_CHANGED; 1305 rrt->rrt_t = t; 1306 } 1307 } 1308 /* 1309 * if nq->rip6_metric == HOPCNT_INFINITY6 then 1310 * do not update age value. Do nothing. 1311 */ 1312 } else if (np->rip6_metric < HOPCNT_INFINITY6) { 1313 /* Got a new valid route */ 1314 if ((rrt = MALLOC(struct riprt)) == NULL) { 1315 fatal("malloc: struct riprt"); 1316 /*NOTREACHED*/ 1317 } 1318 memset(rrt, 0, sizeof(*rrt)); 1319 nq = &rrt->rrt_info; 1320 1321 rrt->rrt_same = NULL; 1322 rrt->rrt_index = ifcp->ifc_index; 1323 rrt->rrt_flags = RTF_UP|RTF_GATEWAY; 1324 rrt->rrt_gw = nh; 1325 *nq = *np; 1326 applyplen(&nq->rip6_dest, nq->rip6_plen); 1327 if (nq->rip6_plen == sizeof(struct in6_addr) * 8) 1328 rrt->rrt_flags |= RTF_HOST; 1329 1330 /* Put the route to the list */ 1331 rrt->rrt_next = riprt; 1332 riprt = rrt; 1333 /* Update routing table */ 1334 addroute(rrt, &nh, ifcp); 1335 rrt->rrt_rflags |= RRTF_CHANGED; 1336 need_trigger = 1; 1337 rrt->rrt_t = t; 1338 } 1339 } 1340 /* XXX need to care the interval between triggered updates */ 1341 if (need_trigger) { 1342 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) { 1343 for (ic = ifc; ic; ic = ic->ifc_next) { 1344 if (ifcp->ifc_index == ic->ifc_index) 1345 continue; 1346 if (ic->ifc_flags & IFF_UP) 1347 ripsend(ic, &ic->ifc_ripsin, 1348 RRTF_CHANGED); 1349 } 1350 } 1351 /* Reset the flag */ 1352 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1353 rrt->rrt_rflags &= ~RRTF_CHANGED; 1354 } 1355 } 1356 1357 /* 1358 * Send all routes request packet to the specified interface. 1359 */ 1360 void 1361 sendrequest(ifcp) 1362 struct ifc *ifcp; 1363 { 1364 struct netinfo6 *np; 1365 int error; 1366 1367 if (ifcp->ifc_flags & IFF_LOOPBACK) 1368 return; 1369 ripbuf->rip6_cmd = RIP6_REQUEST; 1370 np = ripbuf->rip6_nets; 1371 memset(np, 0, sizeof(struct netinfo6)); 1372 np->rip6_metric = HOPCNT_INFINITY6; 1373 tracet(1, "Send rtdump Request to %s (%s)\n", 1374 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1375 error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1)); 1376 if (error == EAFNOSUPPORT) { 1377 /* Protocol not supported */ 1378 tracet(1, "Could not send rtdump Request to %s (%s): " 1379 "set IFF_UP to 0\n", 1380 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1381 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 1382 } 1383 ripbuf->rip6_cmd = RIP6_RESPONSE; 1384 } 1385 1386 /* 1387 * Process a RIP6_REQUEST packet. 1388 */ 1389 void 1390 riprequest(ifcp, np, nn, sin6) 1391 struct ifc *ifcp; 1392 struct netinfo6 *np; 1393 int nn; 1394 struct sockaddr_in6 *sin6; 1395 { 1396 int i; 1397 struct riprt *rrt; 1398 1399 if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) && 1400 np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) { 1401 /* Specific response, don't split-horizon */ 1402 trace(1, "\tRIP Request\n"); 1403 for (i = 0; i < nn; i++, np++) { 1404 rrt = rtsearch(np, NULL); 1405 if (rrt) 1406 np->rip6_metric = rrt->rrt_info.rip6_metric; 1407 else 1408 np->rip6_metric = HOPCNT_INFINITY6; 1409 } 1410 (void)sendpacket(sin6, RIPSIZE(nn)); 1411 return; 1412 } 1413 /* Whole routing table dump */ 1414 trace(1, "\tRIP Request -- whole routing table\n"); 1415 ripsend(ifcp, sin6, RRTF_SENDANYWAY); 1416 } 1417 1418 /* 1419 * Get information of each interface. 1420 */ 1421 void 1422 ifconfig() 1423 { 1424 struct ifaddrs *ifap, *ifa; 1425 struct ifc *ifcp; 1426 struct ipv6_mreq mreq; 1427 int s; 1428 1429 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 1430 fatal("socket"); 1431 /*NOTREACHED*/ 1432 } 1433 1434 if (getifaddrs(&ifap) != 0) { 1435 fatal("getifaddrs"); 1436 /*NOTREACHED*/ 1437 } 1438 1439 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 1440 if (ifa->ifa_addr->sa_family != AF_INET6) 1441 continue; 1442 ifcp = ifc_find(ifa->ifa_name); 1443 /* we are interested in multicast-capable interfaces */ 1444 if ((ifa->ifa_flags & IFF_MULTICAST) == 0) 1445 continue; 1446 if (!ifcp) { 1447 /* new interface */ 1448 if ((ifcp = MALLOC(struct ifc)) == NULL) { 1449 fatal("malloc: struct ifc"); 1450 /*NOTREACHED*/ 1451 } 1452 memset(ifcp, 0, sizeof(*ifcp)); 1453 ifcp->ifc_index = -1; 1454 ifcp->ifc_next = ifc; 1455 ifc = ifcp; 1456 nifc++; 1457 ifcp->ifc_name = allocopy(ifa->ifa_name); 1458 ifcp->ifc_addr = 0; 1459 ifcp->ifc_filter = 0; 1460 ifcp->ifc_flags = ifa->ifa_flags; 1461 trace(1, "newif %s <%s>\n", ifcp->ifc_name, 1462 ifflags(ifcp->ifc_flags)); 1463 if (!strcmp(ifcp->ifc_name, LOOPBACK_IF)) 1464 loopifcp = ifcp; 1465 } else { 1466 /* update flag, this may be up again */ 1467 if (ifcp->ifc_flags != ifa->ifa_flags) { 1468 trace(1, "%s: <%s> -> ", ifcp->ifc_name, 1469 ifflags(ifcp->ifc_flags)); 1470 trace(1, "<%s>\n", ifflags(ifa->ifa_flags)); 1471 ifcp->ifc_cflags |= IFC_CHANGED; 1472 } 1473 ifcp->ifc_flags = ifa->ifa_flags; 1474 } 1475 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s); 1476 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP 1477 && 0 < ifcp->ifc_index && !ifcp->ifc_joined) { 1478 mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr; 1479 mreq.ipv6mr_interface = ifcp->ifc_index; 1480 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP, 1481 &mreq, sizeof(mreq)) < 0) { 1482 fatal("IPV6_JOIN_GROUP"); 1483 /*NOTREACHED*/ 1484 } 1485 trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST); 1486 ifcp->ifc_joined++; 1487 } 1488 } 1489 close(s); 1490 freeifaddrs(ifap); 1491 } 1492 1493 void 1494 ifconfig1(name, sa, ifcp, s) 1495 const char *name; 1496 const struct sockaddr *sa; 1497 struct ifc *ifcp; 1498 int s; 1499 { 1500 struct in6_ifreq ifr; 1501 const struct sockaddr_in6 *sin6; 1502 struct ifac *ifa; 1503 int plen; 1504 char buf[BUFSIZ]; 1505 1506 sin6 = (const struct sockaddr_in6 *)sa; 1507 ifr.ifr_addr = *sin6; 1508 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 1509 if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) { 1510 fatal("ioctl: SIOCGIFNETMASK_IN6"); 1511 /*NOTREACHED*/ 1512 } 1513 plen = sin6mask2len(&ifr.ifr_addr); 1514 if ((ifa = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) { 1515 /* same interface found */ 1516 /* need check if something changed */ 1517 /* XXX not yet implemented */ 1518 return; 1519 } 1520 /* 1521 * New address is found 1522 */ 1523 if ((ifa = MALLOC(struct ifac)) == NULL) { 1524 fatal("malloc: struct ifac"); 1525 /*NOTREACHED*/ 1526 } 1527 memset(ifa, 0, sizeof(*ifa)); 1528 ifa->ifa_conf = ifcp; 1529 ifa->ifa_next = ifcp->ifc_addr; 1530 ifcp->ifc_addr = ifa; 1531 ifa->ifa_addr = sin6->sin6_addr; 1532 ifa->ifa_plen = plen; 1533 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1534 ifr.ifr_addr = *sin6; 1535 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) { 1536 fatal("ioctl: SIOCGIFDSTADDR_IN6"); 1537 /*NOTREACHED*/ 1538 } 1539 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr; 1540 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf)); 1541 trace(1, "found address %s/%d -- %s\n", 1542 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf); 1543 } else { 1544 trace(1, "found address %s/%d\n", 1545 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen); 1546 } 1547 if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 1548 ifcp->ifc_mylladdr = ifa->ifa_addr; 1549 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr); 1550 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len); 1551 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr, 1552 ifcp->ifc_index); 1553 setindex2ifc(ifcp->ifc_index, ifcp); 1554 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index); 1555 if (ifcp->ifc_mtu > RIP6_MAXMTU) 1556 ifcp->ifc_mtu = RIP6_MAXMTU; 1557 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) { 1558 fatal("ioctl: SIOCGIFMETRIC"); 1559 /*NOTREACHED*/ 1560 } 1561 ifcp->ifc_metric = ifr.ifr_metric; 1562 trace(1, "\tindex: %d, mtu: %d, metric: %d\n", 1563 ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric); 1564 } else 1565 ifcp->ifc_cflags |= IFC_CHANGED; 1566 } 1567 1568 /* 1569 * Receive and process routing messages. 1570 * Update interface information as necesssary. 1571 */ 1572 void 1573 rtrecv() 1574 { 1575 char buf[BUFSIZ]; 1576 char *p, *q; 1577 struct rt_msghdr *rtm; 1578 struct ifa_msghdr *ifam; 1579 struct if_msghdr *ifm; 1580 int len; 1581 struct ifc *ifcp, *ic; 1582 int iface = 0, rtable = 0; 1583 struct sockaddr_in6 *rta[RTAX_MAX]; 1584 struct sockaddr_in6 mask; 1585 int i, addrs; 1586 struct riprt *rrt; 1587 1588 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 1589 perror("read from rtsock"); 1590 exit(1); 1591 } 1592 if (len < sizeof(*rtm)) { 1593 trace(1, "short read from rtsock: %d (should be > %lu)\n", 1594 len, (u_long)sizeof(*rtm)); 1595 return; 1596 } 1597 if (dflag >= 2) { 1598 fprintf(stderr, "rtmsg:\n"); 1599 for (i = 0; i < len; i++) { 1600 fprintf(stderr, "%02x ", buf[i] & 0xff); 1601 if (i % 16 == 15) fprintf(stderr, "\n"); 1602 } 1603 fprintf(stderr, "\n"); 1604 } 1605 1606 for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) { 1607 /* safety against bogus message */ 1608 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) { 1609 trace(1, "bogus rtmsg: length=%d\n", 1610 ((struct rt_msghdr *)p)->rtm_msglen); 1611 break; 1612 } 1613 rtm = NULL; 1614 ifam = NULL; 1615 ifm = NULL; 1616 switch (((struct rt_msghdr *)p)->rtm_type) { 1617 case RTM_NEWADDR: 1618 case RTM_DELADDR: 1619 ifam = (struct ifa_msghdr *)p; 1620 addrs = ifam->ifam_addrs; 1621 q = (char *)(ifam + 1); 1622 break; 1623 case RTM_IFINFO: 1624 ifm = (struct if_msghdr *)p; 1625 addrs = ifm->ifm_addrs; 1626 q = (char *)(ifm + 1); 1627 break; 1628 default: 1629 rtm = (struct rt_msghdr *)p; 1630 addrs = rtm->rtm_addrs; 1631 q = (char *)(rtm + 1); 1632 if (rtm->rtm_version != RTM_VERSION) { 1633 trace(1, "unexpected rtmsg version %d " 1634 "(should be %d)\n", 1635 rtm->rtm_version, RTM_VERSION); 1636 continue; 1637 } 1638 if (rtm->rtm_pid == pid) { 1639 #if 0 1640 trace(1, "rtmsg looped back to me, ignored\n"); 1641 #endif 1642 continue; 1643 } 1644 break; 1645 } 1646 memset(&rta, 0, sizeof(rta)); 1647 for (i = 0; i < RTAX_MAX; i++) { 1648 if (addrs & (1 << i)) { 1649 rta[i] = (struct sockaddr_in6 *)q; 1650 q += ROUNDUP(rta[i]->sin6_len); 1651 } 1652 } 1653 1654 trace(1, "rtsock: %s (addrs=%x)\n", 1655 rttypes((struct rt_msghdr *)p), addrs); 1656 if (dflag >= 2) { 1657 for (i = 0; 1658 i < ((struct rt_msghdr *)p)->rtm_msglen; 1659 i++) { 1660 fprintf(stderr, "%02x ", p[i] & 0xff); 1661 if (i % 16 == 15) fprintf(stderr, "\n"); 1662 } 1663 fprintf(stderr, "\n"); 1664 } 1665 1666 /* 1667 * Easy ones first. 1668 * 1669 * We may be able to optimize by using ifm->ifm_index or 1670 * ifam->ifam_index. For simplicity we don't do that here. 1671 */ 1672 switch (((struct rt_msghdr *)p)->rtm_type) { 1673 case RTM_NEWADDR: 1674 case RTM_IFINFO: 1675 iface++; 1676 continue; 1677 case RTM_ADD: 1678 rtable++; 1679 continue; 1680 case RTM_LOSING: 1681 case RTM_MISS: 1682 case RTM_RESOLVE: 1683 case RTM_GET: 1684 case RTM_LOCK: 1685 /* nothing to be done here */ 1686 trace(1, "\tnothing to be done, ignored\n"); 1687 continue; 1688 } 1689 1690 #if 0 1691 if (rta[RTAX_DST] == NULL) { 1692 trace(1, "\tno destination, ignored\n"); 1693 continue; 1694 } 1695 if (rta[RTAX_DST]->sin6_family != AF_INET6) { 1696 trace(1, "\taf mismatch, ignored\n"); 1697 continue; 1698 } 1699 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) { 1700 trace(1, "\tlinklocal destination, ignored\n"); 1701 continue; 1702 } 1703 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) { 1704 trace(1, "\tloopback destination, ignored\n"); 1705 continue; /* Loopback */ 1706 } 1707 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) { 1708 trace(1, "\tmulticast destination, ignored\n"); 1709 continue; 1710 } 1711 #endif 1712 1713 /* hard ones */ 1714 switch (((struct rt_msghdr *)p)->rtm_type) { 1715 case RTM_NEWADDR: 1716 case RTM_IFINFO: 1717 case RTM_ADD: 1718 case RTM_LOSING: 1719 case RTM_MISS: 1720 case RTM_RESOLVE: 1721 case RTM_GET: 1722 case RTM_LOCK: 1723 /* should already be handled */ 1724 fatal("rtrecv: never reach here"); 1725 /*NOTREACHED*/ 1726 case RTM_DELETE: 1727 if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) { 1728 trace(1, "\tsome of dst/gw/netamsk are " 1729 "unavailable, ignored\n"); 1730 break; 1731 } 1732 if ((rtm->rtm_flags & RTF_HOST) != 0) { 1733 mask.sin6_len = sizeof(mask); 1734 memset(&mask.sin6_addr, 0xff, 1735 sizeof(mask.sin6_addr)); 1736 rta[RTAX_NETMASK] = &mask; 1737 } else if (!rta[RTAX_NETMASK]) { 1738 trace(1, "\tsome of dst/gw/netamsk are " 1739 "unavailable, ignored\n"); 1740 break; 1741 } 1742 if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY], 1743 rta[RTAX_NETMASK]) == 0) { 1744 rtable++; /*just to be sure*/ 1745 } 1746 break; 1747 case RTM_CHANGE: 1748 case RTM_REDIRECT: 1749 trace(1, "\tnot supported yet, ignored\n"); 1750 break; 1751 case RTM_DELADDR: 1752 if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) { 1753 trace(1, "\tno netmask or ifa given, ignored\n"); 1754 break; 1755 } 1756 if (ifam->ifam_index < nindex2ifc) 1757 ifcp = index2ifc[ifam->ifam_index]; 1758 else 1759 ifcp = NULL; 1760 if (!ifcp) { 1761 trace(1, "\tinvalid ifam_index %d, ignored\n", 1762 ifam->ifam_index); 1763 break; 1764 } 1765 if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK])) 1766 iface++; 1767 break; 1768 case RTM_OLDADD: 1769 case RTM_OLDDEL: 1770 trace(1, "\tnot supported yet, ignored\n"); 1771 break; 1772 } 1773 1774 } 1775 1776 if (iface) { 1777 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n"); 1778 ifconfig(); 1779 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 1780 if (ifcp->ifc_cflags & IFC_CHANGED) { 1781 if (ifrt(ifcp, 1)) { 1782 for (ic = ifc; ic; ic = ic->ifc_next) { 1783 if (ifcp->ifc_index == ic->ifc_index) 1784 continue; 1785 if (ic->ifc_flags & IFF_UP) 1786 ripsend(ic, &ic->ifc_ripsin, 1787 RRTF_CHANGED); 1788 } 1789 /* Reset the flag */ 1790 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1791 rrt->rrt_rflags &= ~RRTF_CHANGED; 1792 } 1793 ifcp->ifc_cflags &= ~IFC_CHANGED; 1794 } 1795 } 1796 if (rtable) { 1797 trace(1, "rtsock: read routing table again\n"); 1798 krtread(1); 1799 } 1800 } 1801 1802 /* 1803 * remove specified route from the internal routing table. 1804 */ 1805 int 1806 rt_del(sdst, sgw, smask) 1807 const struct sockaddr_in6 *sdst; 1808 const struct sockaddr_in6 *sgw; 1809 const struct sockaddr_in6 *smask; 1810 { 1811 const struct in6_addr *dst = NULL; 1812 const struct in6_addr *gw = NULL; 1813 int prefix; 1814 struct netinfo6 ni6; 1815 struct riprt *rrt = NULL; 1816 time_t t_lifetime; 1817 1818 if (sdst->sin6_family != AF_INET6) { 1819 trace(1, "\tother AF, ignored\n"); 1820 return -1; 1821 } 1822 if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr) 1823 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback) 1824 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) { 1825 trace(1, "\taddress %s not interesting, ignored\n", 1826 inet6_n2p(&sdst->sin6_addr)); 1827 return -1; 1828 } 1829 dst = &sdst->sin6_addr; 1830 if (sgw->sin6_family == AF_INET6) { 1831 /* easy case */ 1832 gw = &sgw->sin6_addr; 1833 prefix = sin6mask2len(smask); 1834 } else if (sgw->sin6_family == AF_LINK) { 1835 /* 1836 * Interface route... a hard case. We need to get the prefix 1837 * length from the kernel, but we now are parsing rtmsg. 1838 * We'll purge matching routes from my list, then get the 1839 * fresh list. 1840 */ 1841 struct riprt *longest; 1842 trace(1, "\t%s is an interface route, guessing prefixlen\n", 1843 inet6_n2p(dst)); 1844 longest = NULL; 1845 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 1846 if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 1847 &sdst->sin6_addr) 1848 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) { 1849 if (!longest 1850 || longest->rrt_info.rip6_plen < 1851 rrt->rrt_info.rip6_plen) { 1852 longest = rrt; 1853 } 1854 } 1855 } 1856 rrt = longest; 1857 if (!rrt) { 1858 trace(1, "\tno matching interface route found\n"); 1859 return -1; 1860 } 1861 gw = &in6addr_loopback; 1862 prefix = rrt->rrt_info.rip6_plen; 1863 } else { 1864 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family); 1865 return -1; 1866 } 1867 1868 trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix); 1869 trace(1, "gw %s\n", inet6_n2p(gw)); 1870 t_lifetime = time(NULL) - RIP_LIFETIME; 1871 /* age route for interface address */ 1872 memset(&ni6, 0, sizeof(ni6)); 1873 ni6.rip6_dest = *dst; 1874 ni6.rip6_plen = prefix; 1875 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 1876 trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest), 1877 ni6.rip6_plen); 1878 if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) { 1879 trace(1, "\tno route found\n"); 1880 return -1; 1881 } 1882 #if 0 1883 if ((rrt->rrt_flags & RTF_STATIC) == 0) { 1884 trace(1, "\tyou can delete static routes only\n"); 1885 } else 1886 #endif 1887 if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) { 1888 trace(1, "\tgw mismatch: %s <-> ", 1889 inet6_n2p(&rrt->rrt_gw)); 1890 trace(1, "%s\n", inet6_n2p(gw)); 1891 } else { 1892 trace(1, "\troute found, age it\n"); 1893 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1894 rrt->rrt_t = t_lifetime; 1895 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 1896 } 1897 } 1898 return 0; 1899 } 1900 1901 /* 1902 * remove specified address from internal interface/routing table. 1903 */ 1904 int 1905 rt_deladdr(ifcp, sifa, smask) 1906 struct ifc *ifcp; 1907 const struct sockaddr_in6 *sifa; 1908 const struct sockaddr_in6 *smask; 1909 { 1910 const struct in6_addr *addr = NULL; 1911 int prefix; 1912 struct ifac *ifa = NULL; 1913 struct netinfo6 ni6; 1914 struct riprt *rrt = NULL; 1915 time_t t_lifetime; 1916 int updated = 0; 1917 1918 if (sifa->sin6_family != AF_INET6) { 1919 trace(1, "\tother AF, ignored\n"); 1920 return -1; 1921 } 1922 addr = &sifa->sin6_addr; 1923 prefix = sin6mask2len(smask); 1924 1925 trace(1, "\tdeleting %s/%d from %s\n", 1926 inet6_n2p(addr), prefix, ifcp->ifc_name); 1927 ifa = ifa_match(ifcp, addr, prefix); 1928 if (!ifa) { 1929 trace(1, "\tno matching ifa found for %s/%d on %s\n", 1930 inet6_n2p(addr), prefix, ifcp->ifc_name); 1931 return -1; 1932 } 1933 if (ifa->ifa_conf != ifcp) { 1934 trace(1, "\taddress table corrupt: back pointer does not match " 1935 "(%s != %s)\n", 1936 ifcp->ifc_name, ifa->ifa_conf->ifc_name); 1937 return -1; 1938 } 1939 /* remove ifa from interface */ 1940 if (ifcp->ifc_addr == ifa) 1941 ifcp->ifc_addr = ifa->ifa_next; 1942 else { 1943 struct ifac *p; 1944 for (p = ifcp->ifc_addr; p; p = p->ifa_next) { 1945 if (p->ifa_next == ifa) { 1946 p->ifa_next = ifa->ifa_next; 1947 break; 1948 } 1949 } 1950 } 1951 ifa->ifa_next = NULL; 1952 ifa->ifa_conf = NULL; 1953 t_lifetime = time(NULL) - RIP_LIFETIME; 1954 /* age route for interface address */ 1955 memset(&ni6, 0, sizeof(ni6)); 1956 ni6.rip6_dest = ifa->ifa_addr; 1957 ni6.rip6_plen = ifa->ifa_plen; 1958 applyplen(&ni6.rip6_dest, ni6.rip6_plen); 1959 trace(1, "\tfind interface route %s/%d on %d\n", 1960 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index); 1961 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 1962 struct in6_addr none; 1963 memset(&none, 0, sizeof(none)); 1964 if (rrt->rrt_index == ifcp->ifc_index && 1965 (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) || 1966 IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) { 1967 trace(1, "\troute found, age it\n"); 1968 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1969 rrt->rrt_t = t_lifetime; 1970 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 1971 } 1972 updated++; 1973 } else { 1974 trace(1, "\tnon-interface route found: %s/%d on %d\n", 1975 inet6_n2p(&rrt->rrt_info.rip6_dest), 1976 rrt->rrt_info.rip6_plen, 1977 rrt->rrt_index); 1978 } 1979 } else 1980 trace(1, "\tno interface route found\n"); 1981 /* age route for p2p destination */ 1982 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1983 memset(&ni6, 0, sizeof(ni6)); 1984 ni6.rip6_dest = ifa->ifa_raddr; 1985 ni6.rip6_plen = 128; 1986 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 1987 trace(1, "\tfind p2p route %s/%d on %d\n", 1988 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, 1989 ifcp->ifc_index); 1990 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 1991 if (rrt->rrt_index == ifcp->ifc_index && 1992 IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) { 1993 trace(1, "\troute found, age it\n"); 1994 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1995 rrt->rrt_t = t_lifetime; 1996 rrt->rrt_info.rip6_metric = 1997 HOPCNT_INFINITY6; 1998 updated++; 1999 } 2000 } else { 2001 trace(1, "\tnon-p2p route found: %s/%d on %d\n", 2002 inet6_n2p(&rrt->rrt_info.rip6_dest), 2003 rrt->rrt_info.rip6_plen, 2004 rrt->rrt_index); 2005 } 2006 } else 2007 trace(1, "\tno p2p route found\n"); 2008 } 2009 return updated ? 0 : -1; 2010 } 2011 2012 /* 2013 * Get each interface address and put those interface routes to the route 2014 * list. 2015 */ 2016 int 2017 ifrt(ifcp, again) 2018 struct ifc *ifcp; 2019 int again; 2020 { 2021 struct ifac *ifa; 2022 struct riprt *rrt = NULL, *search_rrt, *prev_rrt, *loop_rrt; 2023 struct netinfo6 *np; 2024 time_t t_lifetime; 2025 int need_trigger = 0; 2026 2027 if (ifcp->ifc_flags & IFF_LOOPBACK) 2028 return 0; /* ignore loopback */ 2029 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 2030 ifrt_p2p(ifcp, again); 2031 return 0; 2032 } 2033 2034 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2035 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 2036 #if 0 2037 trace(1, "route: %s on %s: " 2038 "skip linklocal interface address\n", 2039 inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name); 2040 #endif 2041 continue; 2042 } 2043 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) { 2044 #if 0 2045 trace(1, "route: %s: skip unspec interface address\n", 2046 ifcp->ifc_name); 2047 #endif 2048 continue; 2049 } 2050 if (ifcp->ifc_flags & IFF_UP) { 2051 if ((rrt = MALLOC(struct riprt)) == NULL) 2052 fatal("malloc: struct riprt"); 2053 memset(rrt, 0, sizeof(*rrt)); 2054 rrt->rrt_same = NULL; 2055 rrt->rrt_index = ifcp->ifc_index; 2056 rrt->rrt_t = 0; /* don't age */ 2057 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2058 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2059 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2060 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 2061 rrt->rrt_flags = RTF_CLONING; 2062 rrt->rrt_rflags |= RRTF_CHANGED; 2063 applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen); 2064 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2065 rrt->rrt_gw = ifa->ifa_addr; 2066 np = &rrt->rrt_info; 2067 search_rrt = rtsearch(np, &prev_rrt); 2068 if (search_rrt != NULL) { 2069 if (search_rrt->rrt_info.rip6_metric <= 2070 rrt->rrt_info.rip6_metric) { 2071 /* Already have better route */ 2072 if (!again) { 2073 trace(1, "route: %s/%d: " 2074 "already registered (%s)\n", 2075 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2076 ifcp->ifc_name); 2077 } 2078 goto next; 2079 } 2080 2081 if (prev_rrt) 2082 prev_rrt->rrt_next = rrt->rrt_next; 2083 else 2084 riprt = rrt->rrt_next; 2085 delroute(&rrt->rrt_info, &rrt->rrt_gw); 2086 } 2087 /* Attach the route to the list */ 2088 trace(1, "route: %s/%d: register route (%s)\n", 2089 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2090 ifcp->ifc_name); 2091 rrt->rrt_next = riprt; 2092 riprt = rrt; 2093 addroute(rrt, &rrt->rrt_gw, ifcp); 2094 rrt = NULL; 2095 sendrequest(ifcp); 2096 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 2097 need_trigger = 1; 2098 } else { 2099 for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) { 2100 if (loop_rrt->rrt_index == ifcp->ifc_index) { 2101 t_lifetime = time(NULL) - RIP_LIFETIME; 2102 if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) { 2103 loop_rrt->rrt_t = t_lifetime; 2104 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 2105 loop_rrt->rrt_rflags |= RRTF_CHANGED; 2106 need_trigger = 1; 2107 } 2108 } 2109 } 2110 } 2111 next: 2112 if (rrt) 2113 free(rrt); 2114 } 2115 return need_trigger; 2116 } 2117 2118 /* 2119 * there are couple of p2p interface routing models. "behavior" lets 2120 * you pick one. it looks that gated behavior fits best with BSDs, 2121 * since BSD kernels do not look at prefix length on p2p interfaces. 2122 */ 2123 void 2124 ifrt_p2p(ifcp, again) 2125 struct ifc *ifcp; 2126 int again; 2127 { 2128 struct ifac *ifa; 2129 struct riprt *rrt, *orrt, *prevrrt; 2130 struct netinfo6 *np; 2131 struct in6_addr addr, dest; 2132 int advert, ignore, i; 2133 #define P2PADVERT_NETWORK 1 2134 #define P2PADVERT_ADDR 2 2135 #define P2PADVERT_DEST 4 2136 #define P2PADVERT_MAX 4 2137 const enum { CISCO, GATED, ROUTE6D } behavior = GATED; 2138 const char *category = ""; 2139 const char *noadv; 2140 2141 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2142 addr = ifa->ifa_addr; 2143 dest = ifa->ifa_raddr; 2144 applyplen(&addr, ifa->ifa_plen); 2145 applyplen(&dest, ifa->ifa_plen); 2146 advert = ignore = 0; 2147 switch (behavior) { 2148 case CISCO: 2149 /* 2150 * honor addr/plen, just like normal shared medium 2151 * interface. this may cause trouble if you reuse 2152 * addr/plen on other interfaces. 2153 * 2154 * advertise addr/plen. 2155 */ 2156 advert |= P2PADVERT_NETWORK; 2157 break; 2158 case GATED: 2159 /* 2160 * prefixlen on p2p interface is meaningless. 2161 * advertise addr/128 and dest/128. 2162 * 2163 * do not install network route to route6d routing 2164 * table (if we do, it would prevent route installation 2165 * for other p2p interface that shares addr/plen). 2166 * 2167 * XXX what should we do if dest is ::? it will not 2168 * get announced anyways (see following filter), 2169 * but we need to think. 2170 */ 2171 advert |= P2PADVERT_ADDR; 2172 advert |= P2PADVERT_DEST; 2173 ignore |= P2PADVERT_NETWORK; 2174 break; 2175 case ROUTE6D: 2176 /* 2177 * just for testing. actually the code is redundant 2178 * given the current p2p interface address assignment 2179 * rule for kame kernel. 2180 * 2181 * intent: 2182 * A/n -> announce A/n 2183 * A B/n, A and B share prefix -> A/n (= B/n) 2184 * A B/n, do not share prefix -> A/128 and B/128 2185 * actually, A/64 and A B/128 are the only cases 2186 * permitted by the kernel: 2187 * A/64 -> A/64 2188 * A B/128 -> A/128 and B/128 2189 */ 2190 if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) { 2191 if (IN6_ARE_ADDR_EQUAL(&addr, &dest)) 2192 advert |= P2PADVERT_NETWORK; 2193 else { 2194 advert |= P2PADVERT_ADDR; 2195 advert |= P2PADVERT_DEST; 2196 ignore |= P2PADVERT_NETWORK; 2197 } 2198 } else 2199 advert |= P2PADVERT_NETWORK; 2200 break; 2201 } 2202 2203 for (i = 1; i <= P2PADVERT_MAX; i *= 2) { 2204 if ((ignore & i) != 0) 2205 continue; 2206 if ((rrt = MALLOC(struct riprt)) == NULL) { 2207 fatal("malloc: struct riprt"); 2208 /*NOTREACHED*/ 2209 } 2210 memset(rrt, 0, sizeof(*rrt)); 2211 rrt->rrt_same = NULL; 2212 rrt->rrt_index = ifcp->ifc_index; 2213 rrt->rrt_t = 0; /* don't age */ 2214 switch (i) { 2215 case P2PADVERT_NETWORK: 2216 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2217 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 2218 applyplen(&rrt->rrt_info.rip6_dest, 2219 ifa->ifa_plen); 2220 category = "network"; 2221 break; 2222 case P2PADVERT_ADDR: 2223 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2224 rrt->rrt_info.rip6_plen = 128; 2225 rrt->rrt_gw = in6addr_loopback; 2226 category = "addr"; 2227 break; 2228 case P2PADVERT_DEST: 2229 rrt->rrt_info.rip6_dest = ifa->ifa_raddr; 2230 rrt->rrt_info.rip6_plen = 128; 2231 rrt->rrt_gw = ifa->ifa_addr; 2232 category = "dest"; 2233 break; 2234 } 2235 if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) || 2236 IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) { 2237 #if 0 2238 trace(1, "route: %s: skip unspec/linklocal " 2239 "(%s on %s)\n", category, ifcp->ifc_name); 2240 #endif 2241 free(rrt); 2242 continue; 2243 } 2244 if ((advert & i) == 0) { 2245 rrt->rrt_rflags |= RRTF_NOADVERTISE; 2246 noadv = ", NO-ADV"; 2247 } else 2248 noadv = ""; 2249 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2250 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2251 np = &rrt->rrt_info; 2252 orrt = rtsearch(np, &prevrrt); 2253 if (!orrt) { 2254 /* Attach the route to the list */ 2255 trace(1, "route: %s/%d: register route " 2256 "(%s on %s%s)\n", 2257 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2258 category, ifcp->ifc_name, noadv); 2259 rrt->rrt_next = riprt; 2260 riprt = rrt; 2261 } else if (rrt->rrt_index != orrt->rrt_index || 2262 rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) { 2263 /* swap route */ 2264 rrt->rrt_next = orrt->rrt_next; 2265 if (prevrrt) 2266 prevrrt->rrt_next = rrt; 2267 else 2268 riprt = rrt; 2269 free(orrt); 2270 2271 trace(1, "route: %s/%d: update (%s on %s%s)\n", 2272 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2273 category, ifcp->ifc_name, noadv); 2274 } else { 2275 /* Already found */ 2276 if (!again) { 2277 trace(1, "route: %s/%d: " 2278 "already registered (%s on %s%s)\n", 2279 inet6_n2p(&np->rip6_dest), 2280 np->rip6_plen, category, 2281 ifcp->ifc_name, noadv); 2282 } 2283 free(rrt); 2284 } 2285 } 2286 } 2287 #undef P2PADVERT_NETWORK 2288 #undef P2PADVERT_ADDR 2289 #undef P2PADVERT_DEST 2290 #undef P2PADVERT_MAX 2291 } 2292 2293 int 2294 getifmtu(ifindex) 2295 int ifindex; 2296 { 2297 int mib[6]; 2298 char *buf; 2299 size_t msize; 2300 struct if_msghdr *ifm; 2301 int mtu; 2302 2303 mib[0] = CTL_NET; 2304 mib[1] = PF_ROUTE; 2305 mib[2] = 0; 2306 mib[3] = AF_INET6; 2307 mib[4] = NET_RT_IFLIST; 2308 mib[5] = ifindex; 2309 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2310 fatal("sysctl estimate NET_RT_IFLIST"); 2311 /*NOTREACHED*/ 2312 } 2313 if ((buf = malloc(msize)) == NULL) { 2314 fatal("malloc"); 2315 /*NOTREACHED*/ 2316 } 2317 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2318 fatal("sysctl NET_RT_IFLIST"); 2319 /*NOTREACHED*/ 2320 } 2321 ifm = (struct if_msghdr *)buf; 2322 mtu = ifm->ifm_data.ifi_mtu; 2323 #ifdef __FreeBSD__ 2324 if (ifindex != ifm->ifm_index) { 2325 fatal("ifindex does not match with ifm_index"); 2326 /*NOTREACHED*/ 2327 } 2328 #endif 2329 free(buf); 2330 return mtu; 2331 } 2332 2333 const char * 2334 rttypes(rtm) 2335 struct rt_msghdr *rtm; 2336 { 2337 #define RTTYPE(s, f) \ 2338 do { \ 2339 if (rtm->rtm_type == (f)) \ 2340 return (s); \ 2341 } while (0) 2342 RTTYPE("ADD", RTM_ADD); 2343 RTTYPE("DELETE", RTM_DELETE); 2344 RTTYPE("CHANGE", RTM_CHANGE); 2345 RTTYPE("GET", RTM_GET); 2346 RTTYPE("LOSING", RTM_LOSING); 2347 RTTYPE("REDIRECT", RTM_REDIRECT); 2348 RTTYPE("MISS", RTM_MISS); 2349 RTTYPE("LOCK", RTM_LOCK); 2350 RTTYPE("OLDADD", RTM_OLDADD); 2351 RTTYPE("OLDDEL", RTM_OLDDEL); 2352 RTTYPE("RESOLVE", RTM_RESOLVE); 2353 RTTYPE("NEWADDR", RTM_NEWADDR); 2354 RTTYPE("DELADDR", RTM_DELADDR); 2355 RTTYPE("IFINFO", RTM_IFINFO); 2356 #ifdef RTM_OLDADD 2357 RTTYPE("OLDADD", RTM_OLDADD); 2358 #endif 2359 #ifdef RTM_OLDDEL 2360 RTTYPE("OLDDEL", RTM_OLDDEL); 2361 #endif 2362 #ifdef RTM_OIFINFO 2363 RTTYPE("OIFINFO", RTM_OIFINFO); 2364 #endif 2365 #ifdef RTM_IFANNOUNCE 2366 RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE); 2367 #endif 2368 #ifdef RTM_NEWMADDR 2369 RTTYPE("NEWMADDR", RTM_NEWMADDR); 2370 #endif 2371 #ifdef RTM_DELMADDR 2372 RTTYPE("DELMADDR", RTM_DELMADDR); 2373 #endif 2374 #undef RTTYPE 2375 return NULL; 2376 } 2377 2378 const char * 2379 rtflags(rtm) 2380 struct rt_msghdr *rtm; 2381 { 2382 static char buf[BUFSIZ]; 2383 2384 /* 2385 * letter conflict should be okay. painful when *BSD diverges... 2386 */ 2387 strlcpy(buf, "", sizeof(buf)); 2388 #define RTFLAG(s, f) \ 2389 do { \ 2390 if (rtm->rtm_flags & (f)) \ 2391 strlcat(buf, (s), sizeof(buf)); \ 2392 } while (0) 2393 RTFLAG("U", RTF_UP); 2394 RTFLAG("G", RTF_GATEWAY); 2395 RTFLAG("H", RTF_HOST); 2396 RTFLAG("R", RTF_REJECT); 2397 RTFLAG("D", RTF_DYNAMIC); 2398 RTFLAG("M", RTF_MODIFIED); 2399 RTFLAG("d", RTF_DONE); 2400 #ifdef RTF_MASK 2401 RTFLAG("m", RTF_MASK); 2402 #endif 2403 RTFLAG("C", RTF_CLONING); 2404 #ifdef RTF_CLONED 2405 RTFLAG("c", RTF_CLONED); 2406 #endif 2407 #ifdef RTF_PRCLONING 2408 RTFLAG("c", RTF_PRCLONING); 2409 #endif 2410 #ifdef RTF_WASCLONED 2411 RTFLAG("W", RTF_WASCLONED); 2412 #endif 2413 RTFLAG("X", RTF_XRESOLVE); 2414 RTFLAG("L", RTF_LLINFO); 2415 RTFLAG("S", RTF_STATIC); 2416 RTFLAG("B", RTF_BLACKHOLE); 2417 #ifdef RTF_PROTO3 2418 RTFLAG("3", RTF_PROTO3); 2419 #endif 2420 RTFLAG("2", RTF_PROTO2); 2421 RTFLAG("1", RTF_PROTO1); 2422 #ifdef RTF_BROADCAST 2423 RTFLAG("b", RTF_BROADCAST); 2424 #endif 2425 #ifdef RTF_DEFAULT 2426 RTFLAG("d", RTF_DEFAULT); 2427 #endif 2428 #ifdef RTF_ISAROUTER 2429 RTFLAG("r", RTF_ISAROUTER); 2430 #endif 2431 #ifdef RTF_TUNNEL 2432 RTFLAG("T", RTF_TUNNEL); 2433 #endif 2434 #ifdef RTF_AUTH 2435 RTFLAG("A", RTF_AUTH); 2436 #endif 2437 #ifdef RTF_CRYPT 2438 RTFLAG("E", RTF_CRYPT); 2439 #endif 2440 #undef RTFLAG 2441 return buf; 2442 } 2443 2444 const char * 2445 ifflags(flags) 2446 int flags; 2447 { 2448 static char buf[BUFSIZ]; 2449 2450 strlcpy(buf, "", sizeof(buf)); 2451 #define IFFLAG(s, f) \ 2452 do { \ 2453 if (flags & (f)) { \ 2454 if (buf[0]) \ 2455 strlcat(buf, ",", sizeof(buf)); \ 2456 strlcat(buf, (s), sizeof(buf)); \ 2457 } \ 2458 } while (0) 2459 IFFLAG("UP", IFF_UP); 2460 IFFLAG("BROADCAST", IFF_BROADCAST); 2461 IFFLAG("DEBUG", IFF_DEBUG); 2462 IFFLAG("LOOPBACK", IFF_LOOPBACK); 2463 IFFLAG("POINTOPOINT", IFF_POINTOPOINT); 2464 #ifdef IFF_NOTRAILERS 2465 IFFLAG("NOTRAILERS", IFF_NOTRAILERS); 2466 #endif 2467 #ifdef IFF_SMART 2468 IFFLAG("SMART", IFF_SMART); 2469 #endif 2470 IFFLAG("RUNNING", IFF_RUNNING); 2471 IFFLAG("NOARP", IFF_NOARP); 2472 IFFLAG("PROMISC", IFF_PROMISC); 2473 IFFLAG("ALLMULTI", IFF_ALLMULTI); 2474 IFFLAG("OACTIVE", IFF_OACTIVE); 2475 IFFLAG("SIMPLEX", IFF_SIMPLEX); 2476 IFFLAG("LINK0", IFF_LINK0); 2477 IFFLAG("LINK1", IFF_LINK1); 2478 IFFLAG("LINK2", IFF_LINK2); 2479 IFFLAG("MULTICAST", IFF_MULTICAST); 2480 #undef IFFLAG 2481 return buf; 2482 } 2483 2484 void 2485 krtread(again) 2486 int again; 2487 { 2488 int mib[6]; 2489 size_t msize; 2490 char *buf, *p, *lim; 2491 struct rt_msghdr *rtm; 2492 int retry; 2493 const char *errmsg; 2494 2495 retry = 0; 2496 buf = NULL; 2497 mib[0] = CTL_NET; 2498 mib[1] = PF_ROUTE; 2499 mib[2] = 0; 2500 mib[3] = AF_INET6; /* Address family */ 2501 mib[4] = NET_RT_DUMP; /* Dump the kernel routing table */ 2502 mib[5] = 0; /* No flags */ 2503 do { 2504 retry++; 2505 errmsg = NULL; 2506 if (buf) 2507 free(buf); 2508 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2509 errmsg = "sysctl estimate"; 2510 continue; 2511 } 2512 if ((buf = malloc(msize)) == NULL) { 2513 errmsg = "malloc"; 2514 continue; 2515 } 2516 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2517 errmsg = "sysctl NET_RT_DUMP"; 2518 continue; 2519 } 2520 } while (retry < 5 && errmsg != NULL); 2521 if (errmsg) { 2522 fatal("%s (with %d retries, msize=%lu)", errmsg, retry, 2523 (u_long)msize); 2524 /*NOTREACHED*/ 2525 } else if (1 < retry) 2526 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry); 2527 2528 lim = buf + msize; 2529 for (p = buf; p < lim; p += rtm->rtm_msglen) { 2530 rtm = (struct rt_msghdr *)p; 2531 rt_entry(rtm, again); 2532 } 2533 free(buf); 2534 } 2535 2536 void 2537 rt_entry(rtm, again) 2538 struct rt_msghdr *rtm; 2539 int again; 2540 { 2541 struct sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask; 2542 struct sockaddr_in6 *sin6_genmask, *sin6_ifp; 2543 char *rtmp, *ifname = NULL; 2544 struct riprt *rrt, *orrt; 2545 struct netinfo6 *np; 2546 int s; 2547 2548 sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0; 2549 if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags & 2550 (RTF_CLONING|RTF_XRESOLVE|RTF_LLINFO|RTF_BLACKHOLE)) { 2551 return; /* not interested in the link route */ 2552 } 2553 /* do not look at cloned routes */ 2554 #ifdef RTF_WASCLONED 2555 if (rtm->rtm_flags & RTF_WASCLONED) 2556 return; 2557 #endif 2558 #ifdef RTF_CLONED 2559 if (rtm->rtm_flags & RTF_CLONED) 2560 return; 2561 #endif 2562 /* 2563 * do not look at dynamic routes. 2564 * netbsd/openbsd cloned routes have UGHD. 2565 */ 2566 if (rtm->rtm_flags & RTF_DYNAMIC) 2567 return; 2568 rtmp = (char *)(rtm + 1); 2569 /* Destination */ 2570 if ((rtm->rtm_addrs & RTA_DST) == 0) 2571 return; /* ignore routes without destination address */ 2572 sin6_dst = (struct sockaddr_in6 *)rtmp; 2573 rtmp += ROUNDUP(sin6_dst->sin6_len); 2574 if (rtm->rtm_addrs & RTA_GATEWAY) { 2575 sin6_gw = (struct sockaddr_in6 *)rtmp; 2576 rtmp += ROUNDUP(sin6_gw->sin6_len); 2577 } 2578 if (rtm->rtm_addrs & RTA_NETMASK) { 2579 sin6_mask = (struct sockaddr_in6 *)rtmp; 2580 rtmp += ROUNDUP(sin6_mask->sin6_len); 2581 } 2582 if (rtm->rtm_addrs & RTA_GENMASK) { 2583 sin6_genmask = (struct sockaddr_in6 *)rtmp; 2584 rtmp += ROUNDUP(sin6_genmask->sin6_len); 2585 } 2586 if (rtm->rtm_addrs & RTA_IFP) { 2587 sin6_ifp = (struct sockaddr_in6 *)rtmp; 2588 rtmp += ROUNDUP(sin6_ifp->sin6_len); 2589 } 2590 2591 /* Destination */ 2592 if (sin6_dst->sin6_family != AF_INET6) 2593 return; 2594 if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr)) 2595 return; /* Link-local */ 2596 if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback)) 2597 return; /* Loopback */ 2598 if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr)) 2599 return; 2600 2601 if ((rrt = MALLOC(struct riprt)) == NULL) { 2602 fatal("malloc: struct riprt"); 2603 /*NOTREACHED*/ 2604 } 2605 memset(rrt, 0, sizeof(*rrt)); 2606 np = &rrt->rrt_info; 2607 rrt->rrt_same = NULL; 2608 rrt->rrt_t = time(NULL); 2609 if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC)) 2610 rrt->rrt_t = 0; /* Don't age static routes */ 2611 np->rip6_tag = 0; 2612 np->rip6_metric = rtm->rtm_rmx.rmx_hopcount; 2613 if (np->rip6_metric < 1) 2614 np->rip6_metric = 1; 2615 rrt->rrt_flags = rtm->rtm_flags; 2616 np->rip6_dest = sin6_dst->sin6_addr; 2617 2618 /* Mask or plen */ 2619 if (rtm->rtm_flags & RTF_HOST) 2620 np->rip6_plen = 128; /* Host route */ 2621 else if (sin6_mask) 2622 np->rip6_plen = sin6mask2len(sin6_mask); 2623 else 2624 np->rip6_plen = 0; 2625 2626 orrt = rtsearch(np, NULL); 2627 if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) { 2628 /* Already found */ 2629 if (!again) { 2630 trace(1, "route: %s/%d flags %s: already registered\n", 2631 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2632 rtflags(rtm)); 2633 } 2634 free(rrt); 2635 return; 2636 } 2637 /* Gateway */ 2638 if (!sin6_gw) 2639 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2640 else { 2641 if (sin6_gw->sin6_family == AF_INET6) 2642 rrt->rrt_gw = sin6_gw->sin6_addr; 2643 else if (sin6_gw->sin6_family == AF_LINK) { 2644 /* XXX in case ppp link? */ 2645 rrt->rrt_gw = in6addr_loopback; 2646 } else 2647 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2648 } 2649 trace(1, "route: %s/%d flags %s", 2650 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm)); 2651 trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw)); 2652 2653 /* Interface */ 2654 s = rtm->rtm_index; 2655 if (s < nindex2ifc && index2ifc[s]) 2656 ifname = index2ifc[s]->ifc_name; 2657 else { 2658 trace(1, " not configured\n"); 2659 free(rrt); 2660 return; 2661 } 2662 trace(1, " if %s sock %d", ifname, s); 2663 rrt->rrt_index = s; 2664 2665 trace(1, "\n"); 2666 2667 /* Check gateway */ 2668 if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) && 2669 !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw) 2670 #ifdef __FreeBSD__ 2671 && (rrt->rrt_flags & RTF_LOCAL) == 0 2672 #endif 2673 ) { 2674 trace(0, "***** Gateway %s is not a link-local address.\n", 2675 inet6_n2p(&rrt->rrt_gw)); 2676 trace(0, "***** dest(%s) if(%s) -- Not optimized.\n", 2677 inet6_n2p(&rrt->rrt_info.rip6_dest), ifname); 2678 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR; 2679 } 2680 2681 /* Put it to the route list */ 2682 if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) { 2683 /* replace route list */ 2684 rrt->rrt_next = orrt->rrt_next; 2685 *orrt = *rrt; 2686 trace(1, "route: %s/%d flags %s: replace new route\n", 2687 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2688 rtflags(rtm)); 2689 free(rrt); 2690 } else { 2691 rrt->rrt_next = riprt; 2692 riprt = rrt; 2693 } 2694 } 2695 2696 int 2697 addroute(rrt, gw, ifcp) 2698 struct riprt *rrt; 2699 const struct in6_addr *gw; 2700 struct ifc *ifcp; 2701 { 2702 struct netinfo6 *np; 2703 u_char buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ]; 2704 struct rt_msghdr *rtm; 2705 struct sockaddr_in6 *sin6; 2706 int len; 2707 2708 np = &rrt->rrt_info; 2709 inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1)); 2710 inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2)); 2711 tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n", 2712 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2713 np->rip6_metric - 1, buf2); 2714 if (rtlog) 2715 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(), 2716 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2717 np->rip6_metric - 1, buf2); 2718 if (nflag) 2719 return 0; 2720 2721 memset(buf, 0, sizeof(buf)); 2722 rtm = (struct rt_msghdr *)buf; 2723 rtm->rtm_type = RTM_ADD; 2724 rtm->rtm_version = RTM_VERSION; 2725 rtm->rtm_seq = ++seq; 2726 rtm->rtm_pid = pid; 2727 rtm->rtm_flags = rrt->rrt_flags; 2728 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2729 rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1; 2730 rtm->rtm_inits = RTV_HOPCOUNT; 2731 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2732 /* Destination */ 2733 sin6->sin6_len = sizeof(struct sockaddr_in6); 2734 sin6->sin6_family = AF_INET6; 2735 sin6->sin6_addr = np->rip6_dest; 2736 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2737 /* Gateway */ 2738 sin6->sin6_len = sizeof(struct sockaddr_in6); 2739 sin6->sin6_family = AF_INET6; 2740 sin6->sin6_addr = *gw; 2741 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2742 /* Netmask */ 2743 sin6->sin6_len = sizeof(struct sockaddr_in6); 2744 sin6->sin6_family = AF_INET6; 2745 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2746 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2747 2748 len = (char *)sin6 - (char *)buf; 2749 rtm->rtm_msglen = len; 2750 if (write(rtsock, buf, len) > 0) 2751 return 0; 2752 2753 if (errno == EEXIST) { 2754 trace(0, "ADD: Route already exists %s/%d gw %s\n", 2755 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2756 if (rtlog) 2757 fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n", 2758 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2759 } else { 2760 trace(0, "Can not write to rtsock (addroute): %s\n", 2761 strerror(errno)); 2762 if (rtlog) 2763 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2764 strerror(errno)); 2765 } 2766 return -1; 2767 } 2768 2769 int 2770 delroute(np, gw) 2771 struct netinfo6 *np; 2772 struct in6_addr *gw; 2773 { 2774 u_char buf[BUFSIZ], buf2[BUFSIZ]; 2775 struct rt_msghdr *rtm; 2776 struct sockaddr_in6 *sin6; 2777 int len; 2778 2779 inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2)); 2780 tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest), 2781 np->rip6_plen, buf2); 2782 if (rtlog) 2783 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n", 2784 hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2785 if (nflag) 2786 return 0; 2787 2788 memset(buf, 0, sizeof(buf)); 2789 rtm = (struct rt_msghdr *)buf; 2790 rtm->rtm_type = RTM_DELETE; 2791 rtm->rtm_version = RTM_VERSION; 2792 rtm->rtm_seq = ++seq; 2793 rtm->rtm_pid = pid; 2794 rtm->rtm_flags = RTF_UP | RTF_GATEWAY; 2795 if (np->rip6_plen == sizeof(struct in6_addr) * 8) 2796 rtm->rtm_flags |= RTF_HOST; 2797 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2798 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2799 /* Destination */ 2800 sin6->sin6_len = sizeof(struct sockaddr_in6); 2801 sin6->sin6_family = AF_INET6; 2802 sin6->sin6_addr = np->rip6_dest; 2803 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2804 /* Gateway */ 2805 sin6->sin6_len = sizeof(struct sockaddr_in6); 2806 sin6->sin6_family = AF_INET6; 2807 sin6->sin6_addr = *gw; 2808 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2809 /* Netmask */ 2810 sin6->sin6_len = sizeof(struct sockaddr_in6); 2811 sin6->sin6_family = AF_INET6; 2812 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2813 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2814 2815 len = (char *)sin6 - (char *)buf; 2816 rtm->rtm_msglen = len; 2817 if (write(rtsock, buf, len) >= 0) 2818 return 0; 2819 2820 if (errno == ESRCH) { 2821 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n", 2822 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2823 if (rtlog) 2824 fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n", 2825 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2826 } else { 2827 trace(0, "Can not write to rtsock (delroute): %s\n", 2828 strerror(errno)); 2829 if (rtlog) 2830 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2831 strerror(errno)); 2832 } 2833 return -1; 2834 } 2835 2836 struct in6_addr * 2837 getroute(np, gw) 2838 struct netinfo6 *np; 2839 struct in6_addr *gw; 2840 { 2841 u_char buf[BUFSIZ]; 2842 u_long myseq; 2843 int len; 2844 struct rt_msghdr *rtm; 2845 struct sockaddr_in6 *sin6; 2846 2847 rtm = (struct rt_msghdr *)buf; 2848 len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6); 2849 memset(rtm, 0, len); 2850 rtm->rtm_type = RTM_GET; 2851 rtm->rtm_version = RTM_VERSION; 2852 myseq = ++seq; 2853 rtm->rtm_seq = myseq; 2854 rtm->rtm_addrs = RTA_DST; 2855 rtm->rtm_msglen = len; 2856 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2857 sin6->sin6_len = sizeof(struct sockaddr_in6); 2858 sin6->sin6_family = AF_INET6; 2859 sin6->sin6_addr = np->rip6_dest; 2860 if (write(rtsock, buf, len) < 0) { 2861 if (errno == ESRCH) /* No such route found */ 2862 return NULL; 2863 perror("write to rtsock"); 2864 exit(1); 2865 } 2866 do { 2867 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 2868 perror("read from rtsock"); 2869 exit(1); 2870 } 2871 rtm = (struct rt_msghdr *)buf; 2872 } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid); 2873 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2874 if (rtm->rtm_addrs & RTA_DST) { 2875 sin6 = (struct sockaddr_in6 *) 2876 ((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2877 } 2878 if (rtm->rtm_addrs & RTA_GATEWAY) { 2879 *gw = sin6->sin6_addr; 2880 return gw; 2881 } 2882 return NULL; 2883 } 2884 2885 const char * 2886 inet6_n2p(p) 2887 const struct in6_addr *p; 2888 { 2889 static char buf[BUFSIZ]; 2890 2891 return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf)); 2892 } 2893 2894 void 2895 ifrtdump(sig) 2896 int sig; 2897 { 2898 2899 ifdump(sig); 2900 rtdump(sig); 2901 } 2902 2903 void 2904 ifdump(sig) 2905 int sig; 2906 { 2907 struct ifc *ifcp; 2908 FILE *dump; 2909 int i; 2910 2911 if (sig == 0) 2912 dump = stderr; 2913 else 2914 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 2915 dump = stderr; 2916 2917 fprintf(dump, "%s: Interface Table Dump\n", hms()); 2918 fprintf(dump, " Number of interfaces: %d\n", nifc); 2919 for (i = 0; i < 2; i++) { 2920 fprintf(dump, " %sadvertising interfaces:\n", i ? "non-" : ""); 2921 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 2922 if (i == 0) { 2923 if ((ifcp->ifc_flags & IFF_UP) == 0) 2924 continue; 2925 if (iff_find(ifcp, 'N') != NULL) 2926 continue; 2927 } else { 2928 if (ifcp->ifc_flags & IFF_UP) 2929 continue; 2930 } 2931 ifdump0(dump, ifcp); 2932 } 2933 } 2934 fprintf(dump, "\n"); 2935 if (dump != stderr) 2936 fclose(dump); 2937 } 2938 2939 void 2940 ifdump0(dump, ifcp) 2941 FILE *dump; 2942 const struct ifc *ifcp; 2943 { 2944 struct ifac *ifa; 2945 struct iff *iffp; 2946 char buf[BUFSIZ]; 2947 const char *ft; 2948 int addr; 2949 2950 fprintf(dump, " %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n", 2951 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags), 2952 inet6_n2p(&ifcp->ifc_mylladdr), 2953 ifcp->ifc_mtu, ifcp->ifc_metric); 2954 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2955 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 2956 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, 2957 buf, sizeof(buf)); 2958 fprintf(dump, "\t%s/%d -- %s\n", 2959 inet6_n2p(&ifa->ifa_addr), 2960 ifa->ifa_plen, buf); 2961 } else { 2962 fprintf(dump, "\t%s/%d\n", 2963 inet6_n2p(&ifa->ifa_addr), 2964 ifa->ifa_plen); 2965 } 2966 } 2967 if (ifcp->ifc_filter) { 2968 fprintf(dump, "\tFilter:"); 2969 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 2970 addr = 0; 2971 switch (iffp->iff_type) { 2972 case 'A': 2973 ft = "Aggregate"; addr++; break; 2974 case 'N': 2975 ft = "No-use"; break; 2976 case 'O': 2977 ft = "Advertise-only"; addr++; break; 2978 case 'T': 2979 ft = "Default-only"; break; 2980 case 'L': 2981 ft = "Listen-only"; addr++; break; 2982 default: 2983 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type); 2984 ft = buf; 2985 addr++; 2986 break; 2987 } 2988 fprintf(dump, " %s", ft); 2989 if (addr) { 2990 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr), 2991 iffp->iff_plen); 2992 } 2993 } 2994 fprintf(dump, "\n"); 2995 } 2996 } 2997 2998 void 2999 rtdump(sig) 3000 int sig; 3001 { 3002 struct riprt *rrt; 3003 char buf[BUFSIZ]; 3004 FILE *dump; 3005 time_t t, age; 3006 3007 if (sig == 0) 3008 dump = stderr; 3009 else 3010 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 3011 dump = stderr; 3012 3013 t = time(NULL); 3014 fprintf(dump, "\n%s: Routing Table Dump\n", hms()); 3015 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 3016 if (rrt->rrt_t == 0) 3017 age = 0; 3018 else 3019 age = t - rrt->rrt_t; 3020 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest, 3021 buf, sizeof(buf)); 3022 fprintf(dump, " %s/%d if(%d:%s) gw(%s) [%d] age(%ld)", 3023 buf, rrt->rrt_info.rip6_plen, rrt->rrt_index, 3024 index2ifc[rrt->rrt_index]->ifc_name, 3025 inet6_n2p(&rrt->rrt_gw), 3026 rrt->rrt_info.rip6_metric, (long)age); 3027 if (rrt->rrt_info.rip6_tag) { 3028 fprintf(dump, " tag(0x%04x)", 3029 ntohs(rrt->rrt_info.rip6_tag) & 0xffff); 3030 } 3031 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) 3032 fprintf(dump, " NOT-LL"); 3033 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 3034 fprintf(dump, " NO-ADV"); 3035 fprintf(dump, "\n"); 3036 } 3037 fprintf(dump, "\n"); 3038 if (dump != stderr) 3039 fclose(dump); 3040 } 3041 3042 /* 3043 * Parse the -A (and -O) options and put corresponding filter object to the 3044 * specified interface structures. Each of the -A/O option has the following 3045 * syntax: -A 5f09:c400::/32,ef0,ef1 (aggregate) 3046 * -O 5f09:c400::/32,ef0,ef1 (only when match) 3047 */ 3048 void 3049 filterconfig() 3050 { 3051 int i; 3052 char *p, *ap, *iflp, *ifname, *ep; 3053 struct iff ftmp, *iff_obj; 3054 struct ifc *ifcp; 3055 struct riprt *rrt; 3056 #if 0 3057 struct in6_addr gw; 3058 #endif 3059 u_long plen; 3060 3061 for (i = 0; i < nfilter; i++) { 3062 ap = filter[i]; 3063 iflp = NULL; 3064 ifcp = NULL; 3065 if (filtertype[i] == 'N' || filtertype[i] == 'T') { 3066 iflp = ap; 3067 goto ifonly; 3068 } 3069 if ((p = strchr(ap, ',')) != NULL) { 3070 *p++ = '\0'; 3071 iflp = p; 3072 } 3073 if ((p = strchr(ap, '/')) == NULL) { 3074 fatal("no prefixlen specified for '%s'", ap); 3075 /*NOTREACHED*/ 3076 } 3077 *p++ = '\0'; 3078 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) { 3079 fatal("invalid prefix specified for '%s'", ap); 3080 /*NOTREACHED*/ 3081 } 3082 errno = 0; 3083 ep = NULL; 3084 plen = strtoul(p, &ep, 10); 3085 if (errno || !*p || *ep || plen > sizeof(ftmp.iff_addr) * 8) { 3086 fatal("invalid prefix length specified for '%s'", ap); 3087 /*NOTREACHED*/ 3088 } 3089 ftmp.iff_plen = plen; 3090 ftmp.iff_next = NULL; 3091 applyplen(&ftmp.iff_addr, ftmp.iff_plen); 3092 ifonly: 3093 ftmp.iff_type = filtertype[i]; 3094 if (iflp == NULL || *iflp == '\0') { 3095 fatal("no interface specified for '%s'", ap); 3096 /*NOTREACHED*/ 3097 } 3098 /* parse the interface listing portion */ 3099 while (iflp) { 3100 ifname = iflp; 3101 if ((iflp = strchr(iflp, ',')) != NULL) 3102 *iflp++ = '\0'; 3103 ifcp = ifc_find(ifname); 3104 if (ifcp == NULL) { 3105 fatal("no interface %s exists", ifname); 3106 /*NOTREACHED*/ 3107 } 3108 iff_obj = (struct iff *)malloc(sizeof(struct iff)); 3109 if (iff_obj == NULL) { 3110 fatal("malloc of iff_obj"); 3111 /*NOTREACHED*/ 3112 } 3113 memcpy((void *)iff_obj, (void *)&ftmp, 3114 sizeof(struct iff)); 3115 /* link it to the interface filter */ 3116 iff_obj->iff_next = ifcp->ifc_filter; 3117 ifcp->ifc_filter = iff_obj; 3118 } 3119 3120 /* 3121 * -A: aggregate configuration. 3122 */ 3123 if (filtertype[i] != 'A') 3124 continue; 3125 /* put the aggregate to the kernel routing table */ 3126 rrt = (struct riprt *)malloc(sizeof(struct riprt)); 3127 if (rrt == NULL) { 3128 fatal("malloc: rrt"); 3129 /*NOTREACHED*/ 3130 } 3131 memset(rrt, 0, sizeof(struct riprt)); 3132 rrt->rrt_info.rip6_dest = ftmp.iff_addr; 3133 rrt->rrt_info.rip6_plen = ftmp.iff_plen; 3134 rrt->rrt_info.rip6_metric = 1; 3135 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 3136 rrt->rrt_gw = in6addr_loopback; 3137 rrt->rrt_flags = RTF_UP | RTF_REJECT; 3138 rrt->rrt_rflags = RRTF_AGGREGATE; 3139 rrt->rrt_t = 0; 3140 rrt->rrt_index = loopifcp->ifc_index; 3141 #if 0 3142 if (getroute(&rrt->rrt_info, &gw)) { 3143 #if 0 3144 /* 3145 * When the address has already been registered in the 3146 * kernel routing table, it should be removed 3147 */ 3148 delroute(&rrt->rrt_info, &gw); 3149 #else 3150 /* it is safer behavior */ 3151 errno = EINVAL; 3152 fatal("%s/%u already in routing table, " 3153 "cannot aggregate", 3154 inet6_n2p(&rrt->rrt_info.rip6_dest), 3155 rrt->rrt_info.rip6_plen); 3156 /*NOTREACHED*/ 3157 #endif 3158 } 3159 #endif 3160 /* Put the route to the list */ 3161 rrt->rrt_next = riprt; 3162 riprt = rrt; 3163 trace(1, "Aggregate: %s/%d for %s\n", 3164 inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen, 3165 ifcp->ifc_name); 3166 /* Add this route to the kernel */ 3167 if (nflag) /* do not modify kernel routing table */ 3168 continue; 3169 addroute(rrt, &in6addr_loopback, loopifcp); 3170 } 3171 } 3172 3173 /***************** utility functions *****************/ 3174 3175 /* 3176 * Returns a pointer to ifac whose address and prefix length matches 3177 * with the address and prefix length specified in the arguments. 3178 */ 3179 struct ifac * 3180 ifa_match(ifcp, ia, plen) 3181 const struct ifc *ifcp; 3182 const struct in6_addr *ia; 3183 int plen; 3184 { 3185 struct ifac *ifa; 3186 3187 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 3188 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) && 3189 ifa->ifa_plen == plen) 3190 break; 3191 } 3192 return ifa; 3193 } 3194 3195 /* 3196 * Return a pointer to riprt structure whose address and prefix length 3197 * matches with the address and prefix length found in the argument. 3198 * Note: This is not a rtalloc(). Therefore exact match is necessary. 3199 */ 3200 struct riprt * 3201 rtsearch(np, prev_rrt) 3202 struct netinfo6 *np; 3203 struct riprt **prev_rrt; 3204 { 3205 struct riprt *rrt; 3206 3207 if (prev_rrt) 3208 *prev_rrt = NULL; 3209 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 3210 if (rrt->rrt_info.rip6_plen == np->rip6_plen && 3211 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 3212 &np->rip6_dest)) 3213 return rrt; 3214 if (prev_rrt) 3215 *prev_rrt = rrt; 3216 } 3217 if (prev_rrt) 3218 *prev_rrt = NULL; 3219 return 0; 3220 } 3221 3222 int 3223 sin6mask2len(sin6) 3224 const struct sockaddr_in6 *sin6; 3225 { 3226 3227 return mask2len(&sin6->sin6_addr, 3228 sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr)); 3229 } 3230 3231 int 3232 mask2len(addr, lenlim) 3233 const struct in6_addr *addr; 3234 int lenlim; 3235 { 3236 int i = 0, j; 3237 const u_char *p = (const u_char *)addr; 3238 3239 for (j = 0; j < lenlim; j++, p++) { 3240 if (*p != 0xff) 3241 break; 3242 i += 8; 3243 } 3244 if (j < lenlim) { 3245 switch (*p) { 3246 #define MASKLEN(m, l) case m: do { i += l; break; } while (0) 3247 MASKLEN(0xfe, 7); break; 3248 MASKLEN(0xfc, 6); break; 3249 MASKLEN(0xf8, 5); break; 3250 MASKLEN(0xf0, 4); break; 3251 MASKLEN(0xe0, 3); break; 3252 MASKLEN(0xc0, 2); break; 3253 MASKLEN(0x80, 1); break; 3254 #undef MASKLEN 3255 } 3256 } 3257 return i; 3258 } 3259 3260 void 3261 applymask(addr, mask) 3262 struct in6_addr *addr, *mask; 3263 { 3264 int i; 3265 u_long *p, *q; 3266 3267 p = (u_long *)addr; q = (u_long *)mask; 3268 for (i = 0; i < 4; i++) 3269 *p++ &= *q++; 3270 } 3271 3272 static const u_char plent[8] = { 3273 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe 3274 }; 3275 3276 void 3277 applyplen(ia, plen) 3278 struct in6_addr *ia; 3279 int plen; 3280 { 3281 u_char *p; 3282 int i; 3283 3284 p = ia->s6_addr; 3285 for (i = 0; i < 16; i++) { 3286 if (plen <= 0) 3287 *p = 0; 3288 else if (plen < 8) 3289 *p &= plent[plen]; 3290 p++, plen -= 8; 3291 } 3292 } 3293 3294 static const int pl2m[9] = { 3295 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff 3296 }; 3297 3298 struct in6_addr * 3299 plen2mask(n) 3300 int n; 3301 { 3302 static struct in6_addr ia; 3303 u_char *p; 3304 int i; 3305 3306 memset(&ia, 0, sizeof(struct in6_addr)); 3307 p = (u_char *)&ia; 3308 for (i = 0; i < 16; i++, p++, n -= 8) { 3309 if (n >= 8) { 3310 *p = 0xff; 3311 continue; 3312 } 3313 *p = pl2m[n]; 3314 break; 3315 } 3316 return &ia; 3317 } 3318 3319 char * 3320 allocopy(p) 3321 char *p; 3322 { 3323 int len = strlen(p) + 1; 3324 char *q = (char *)malloc(len); 3325 3326 if (!q) { 3327 fatal("malloc"); 3328 /*NOTREACHED*/ 3329 } 3330 3331 strlcpy(q, p, len); 3332 return q; 3333 } 3334 3335 char * 3336 hms() 3337 { 3338 static char buf[BUFSIZ]; 3339 time_t t; 3340 struct tm *tm; 3341 3342 t = time(NULL); 3343 if ((tm = localtime(&t)) == 0) { 3344 fatal("localtime"); 3345 /*NOTREACHED*/ 3346 } 3347 snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min, 3348 tm->tm_sec); 3349 return buf; 3350 } 3351 3352 #define RIPRANDDEV 1.0 /* 30 +- 15, max - min = 30 */ 3353 3354 int 3355 ripinterval(timer) 3356 int timer; 3357 { 3358 double r = rand(); 3359 3360 interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5)); 3361 nextalarm = time(NULL) + interval; 3362 return interval; 3363 } 3364 3365 time_t 3366 ripsuptrig() 3367 { 3368 time_t t; 3369 3370 double r = rand(); 3371 t = (int)(RIP_TRIG_INT6_MIN + 3372 (RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX)); 3373 sup_trig_update = time(NULL) + t; 3374 return t; 3375 } 3376 3377 void 3378 #ifdef __STDC__ 3379 fatal(const char *fmt, ...) 3380 #else 3381 fatal(fmt, va_alist) 3382 char *fmt; 3383 va_dcl 3384 #endif 3385 { 3386 va_list ap; 3387 char buf[1024]; 3388 3389 #ifdef __STDC__ 3390 va_start(ap, fmt); 3391 #else 3392 va_start(ap); 3393 #endif 3394 vsnprintf(buf, sizeof(buf), fmt, ap); 3395 va_end(ap); 3396 perror(buf); 3397 if (errno) 3398 syslog(LOG_ERR, "%s: %s", buf, strerror(errno)); 3399 else 3400 syslog(LOG_ERR, "%s", buf); 3401 rtdexit(); 3402 } 3403 3404 void 3405 #ifdef __STDC__ 3406 tracet(int level, const char *fmt, ...) 3407 #else 3408 tracet(level, fmt, va_alist) 3409 int level; 3410 char *fmt; 3411 va_dcl 3412 #endif 3413 { 3414 va_list ap; 3415 3416 if (level <= dflag) { 3417 #ifdef __STDC__ 3418 va_start(ap, fmt); 3419 #else 3420 va_start(ap); 3421 #endif 3422 fprintf(stderr, "%s: ", hms()); 3423 vfprintf(stderr, fmt, ap); 3424 va_end(ap); 3425 } 3426 if (dflag) { 3427 #ifdef __STDC__ 3428 va_start(ap, fmt); 3429 #else 3430 va_start(ap); 3431 #endif 3432 if (level > 0) 3433 vsyslog(LOG_DEBUG, fmt, ap); 3434 else 3435 vsyslog(LOG_WARNING, fmt, ap); 3436 va_end(ap); 3437 } 3438 } 3439 3440 void 3441 #ifdef __STDC__ 3442 trace(int level, const char *fmt, ...) 3443 #else 3444 trace(level, fmt, va_alist) 3445 int level; 3446 char *fmt; 3447 va_dcl 3448 #endif 3449 { 3450 va_list ap; 3451 3452 if (level <= dflag) { 3453 #ifdef __STDC__ 3454 va_start(ap, fmt); 3455 #else 3456 va_start(ap); 3457 #endif 3458 vfprintf(stderr, fmt, ap); 3459 va_end(ap); 3460 } 3461 if (dflag) { 3462 #ifdef __STDC__ 3463 va_start(ap, fmt); 3464 #else 3465 va_start(ap); 3466 #endif 3467 if (level > 0) 3468 vsyslog(LOG_DEBUG, fmt, ap); 3469 else 3470 vsyslog(LOG_WARNING, fmt, ap); 3471 va_end(ap); 3472 } 3473 } 3474 3475 unsigned int 3476 if_maxindex() 3477 { 3478 struct if_nameindex *p, *p0; 3479 unsigned int max = 0; 3480 3481 p0 = if_nameindex(); 3482 for (p = p0; p && p->if_index && p->if_name; p++) { 3483 if (max < p->if_index) 3484 max = p->if_index; 3485 } 3486 if_freenameindex(p0); 3487 return max; 3488 } 3489 3490 struct ifc * 3491 ifc_find(name) 3492 char *name; 3493 { 3494 struct ifc *ifcp; 3495 3496 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 3497 if (strcmp(name, ifcp->ifc_name) == 0) 3498 return ifcp; 3499 } 3500 return (struct ifc *)NULL; 3501 } 3502 3503 struct iff * 3504 iff_find(ifcp, type) 3505 struct ifc *ifcp; 3506 int type; 3507 { 3508 struct iff *iffp; 3509 3510 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 3511 if (iffp->iff_type == type) 3512 return iffp; 3513 } 3514 return NULL; 3515 } 3516 3517 void 3518 setindex2ifc(idx, ifcp) 3519 int idx; 3520 struct ifc *ifcp; 3521 { 3522 int n; 3523 struct ifc **p; 3524 3525 if (!index2ifc) { 3526 nindex2ifc = 5; /*initial guess*/ 3527 index2ifc = (struct ifc **) 3528 malloc(sizeof(*index2ifc) * nindex2ifc); 3529 if (index2ifc == NULL) { 3530 fatal("malloc"); 3531 /*NOTREACHED*/ 3532 } 3533 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc); 3534 } 3535 n = nindex2ifc; 3536 while (nindex2ifc <= idx) 3537 nindex2ifc *= 2; 3538 if (n != nindex2ifc) { 3539 p = (struct ifc **)realloc(index2ifc, 3540 sizeof(*index2ifc) * nindex2ifc); 3541 if (p == NULL) { 3542 fatal("realloc"); 3543 /*NOTREACHED*/ 3544 } 3545 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n)); 3546 index2ifc = p; 3547 } 3548 index2ifc[idx] = ifcp; 3549 } 3550