1 /* $FreeBSD$ */ 2 /* $KAME: route6d.c,v 1.104 2003/10/31 00:30:20 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 1.104 2003/10/31 00:30:20 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 #include <net/if_var.h> 66 #define _KERNEL 1 67 #include <net/route.h> 68 #undef _KERNEL 69 #include <netinet/in.h> 70 #include <netinet/in_var.h> 71 #include <netinet/ip6.h> 72 #include <netinet/udp.h> 73 #include <netdb.h> 74 #include <ifaddrs.h> 75 76 #include <arpa/inet.h> 77 78 #include "route6d.h" 79 80 #define MAXFILTER 40 81 82 #ifdef DEBUG 83 #define INIT_INTERVAL6 6 84 #else 85 #define INIT_INTERVAL6 10 /* Wait to submit an initial riprequest */ 86 #endif 87 88 /* alignment constraint for routing socket */ 89 #define ROUNDUP(a) \ 90 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 91 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 92 93 /* 94 * Following two macros are highly depending on KAME Release 95 */ 96 #define IN6_LINKLOCAL_IFINDEX(addr) \ 97 ((addr).s6_addr[2] << 8 | (addr).s6_addr[3]) 98 99 #define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \ 100 do { \ 101 (addr).s6_addr[2] = ((index) >> 8) & 0xff; \ 102 (addr).s6_addr[3] = (index) & 0xff; \ 103 } while (0) 104 105 struct ifc { /* Configuration of an interface */ 106 char *ifc_name; /* if name */ 107 struct ifc *ifc_next; 108 int ifc_index; /* if index */ 109 int ifc_mtu; /* if mtu */ 110 int ifc_metric; /* if metric */ 111 u_int ifc_flags; /* flags */ 112 short ifc_cflags; /* IFC_XXX */ 113 struct in6_addr ifc_mylladdr; /* my link-local address */ 114 struct sockaddr_in6 ifc_ripsin; /* rip multicast address */ 115 struct iff *ifc_filter; /* filter structure */ 116 struct ifac *ifc_addr; /* list of AF_INET6 addresses */ 117 int ifc_joined; /* joined to ff02::9 */ 118 }; 119 120 struct ifac { /* Adddress associated to an interface */ 121 struct ifc *ifa_conf; /* back pointer */ 122 struct ifac *ifa_next; 123 struct in6_addr ifa_addr; /* address */ 124 struct in6_addr ifa_raddr; /* remote address, valid in p2p */ 125 int ifa_plen; /* prefix length */ 126 }; 127 128 struct iff { 129 int iff_type; 130 struct in6_addr iff_addr; 131 int iff_plen; 132 struct iff *iff_next; 133 }; 134 135 struct ifc *ifc; 136 int nifc; /* number of valid ifc's */ 137 struct ifc **index2ifc; 138 int nindex2ifc; 139 struct ifc *loopifcp = NULL; /* pointing to loopback */ 140 #ifdef HAVE_POLL_H 141 struct pollfd set[2]; 142 #else 143 fd_set *sockvecp; /* vector to select() for receiving */ 144 fd_set *recvecp; 145 int fdmasks; 146 int maxfd; /* maximum fd for select() */ 147 #endif 148 int rtsock; /* the routing socket */ 149 int ripsock; /* socket to send/receive RIP datagram */ 150 151 struct rip6 *ripbuf; /* packet buffer for sending */ 152 153 /* 154 * Maintain the routes in a linked list. When the number of the routes 155 * grows, somebody would like to introduce a hash based or a radix tree 156 * based structure. I believe the number of routes handled by RIP is 157 * limited and I don't have to manage a complex data structure, however. 158 * 159 * One of the major drawbacks of the linear linked list is the difficulty 160 * of representing the relationship between a couple of routes. This may 161 * be a significant problem when we have to support route aggregation with 162 * supressing the specifices covered by the aggregate. 163 */ 164 165 struct riprt { 166 struct riprt *rrt_next; /* next destination */ 167 struct riprt *rrt_same; /* same destination - future use */ 168 struct netinfo6 rrt_info; /* network info */ 169 struct in6_addr rrt_gw; /* gateway */ 170 u_long rrt_flags; /* kernel routing table flags */ 171 u_long rrt_rflags; /* route6d routing table flags */ 172 time_t rrt_t; /* when the route validated */ 173 int rrt_index; /* ifindex from which this route got */ 174 }; 175 176 struct riprt *riprt = 0; 177 178 int dflag = 0; /* debug flag */ 179 int qflag = 0; /* quiet flag */ 180 int nflag = 0; /* don't update kernel routing table */ 181 int aflag = 0; /* age out even the statically defined routes */ 182 int hflag = 0; /* don't split horizon */ 183 int lflag = 0; /* exchange site local routes */ 184 int sflag = 0; /* announce static routes w/ split horizon */ 185 int Sflag = 0; /* announce static routes to every interface */ 186 unsigned long routetag = 0; /* route tag attached on originating case */ 187 188 char *filter[MAXFILTER]; 189 int filtertype[MAXFILTER]; 190 int nfilter = 0; 191 192 pid_t pid; 193 194 struct sockaddr_storage ripsin; 195 196 int interval = 1; 197 time_t nextalarm = 0; 198 time_t sup_trig_update = 0; 199 200 FILE *rtlog = NULL; 201 202 int logopened = 0; 203 204 static int seq = 0; 205 206 volatile sig_atomic_t seenalrm; 207 volatile sig_atomic_t seenquit; 208 volatile sig_atomic_t seenusr1; 209 210 #define RRTF_AGGREGATE 0x08000000 211 #define RRTF_NOADVERTISE 0x10000000 212 #define RRTF_NH_NOT_LLADDR 0x20000000 213 #define RRTF_SENDANYWAY 0x40000000 214 #define RRTF_CHANGED 0x80000000 215 216 int main(int, char **); 217 void sighandler(int); 218 void ripalarm(void); 219 void riprecv(void); 220 void ripsend(struct ifc *, struct sockaddr_in6 *, int); 221 int out_filter(struct riprt *, struct ifc *); 222 void init(void); 223 void sockopt(struct ifc *); 224 void ifconfig(void); 225 void ifconfig1(const char *, const struct sockaddr *, struct ifc *, int); 226 void rtrecv(void); 227 int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *, 228 const struct sockaddr_in6 *); 229 int rt_deladdr(struct ifc *, const struct sockaddr_in6 *, 230 const struct sockaddr_in6 *); 231 void filterconfig(void); 232 int getifmtu(int); 233 const char *rttypes(struct rt_msghdr *); 234 const char *rtflags(struct rt_msghdr *); 235 const char *ifflags(int); 236 int ifrt(struct ifc *, int); 237 void ifrt_p2p(struct ifc *, int); 238 void applymask(struct in6_addr *, struct in6_addr *); 239 void applyplen(struct in6_addr *, int); 240 void ifrtdump(int); 241 void ifdump(int); 242 void ifdump0(FILE *, const struct ifc *); 243 void rtdump(int); 244 void rt_entry(struct rt_msghdr *, int); 245 void rtdexit(void); 246 void riprequest(struct ifc *, struct netinfo6 *, int, 247 struct sockaddr_in6 *); 248 void ripflush(struct ifc *, struct sockaddr_in6 *); 249 void sendrequest(struct ifc *); 250 int sin6mask2len(const struct sockaddr_in6 *); 251 int mask2len(const struct in6_addr *, int); 252 int sendpacket(struct sockaddr_in6 *, int); 253 int addroute(struct riprt *, const struct in6_addr *, struct ifc *); 254 int delroute(struct netinfo6 *, struct in6_addr *); 255 struct in6_addr *getroute(struct netinfo6 *, struct in6_addr *); 256 void krtread(int); 257 int tobeadv(struct riprt *, struct ifc *); 258 char *allocopy(char *); 259 char *hms(void); 260 const char *inet6_n2p(const struct in6_addr *); 261 struct ifac *ifa_match(const struct ifc *, const struct in6_addr *, int); 262 struct in6_addr *plen2mask(int); 263 struct riprt *rtsearch(struct netinfo6 *, struct riprt **); 264 int ripinterval(int); 265 time_t ripsuptrig(void); 266 void fatal(const char *, ...) 267 __attribute__((__format__(__printf__, 1, 2))); 268 void trace(int, const char *, ...) 269 __attribute__((__format__(__printf__, 2, 3))); 270 void tracet(int, const char *, ...) 271 __attribute__((__format__(__printf__, 2, 3))); 272 unsigned int if_maxindex(void); 273 struct ifc *ifc_find(char *); 274 struct iff *iff_find(struct ifc *, int); 275 void setindex2ifc(int, struct ifc *); 276 277 #define MALLOC(type) ((type *)malloc(sizeof(type))) 278 279 int 280 main(argc, argv) 281 int argc; 282 char **argv; 283 { 284 int ch; 285 int error = 0; 286 struct ifc *ifcp; 287 sigset_t mask, omask; 288 FILE *pidfile; 289 char *progname; 290 char *ep; 291 292 progname = strrchr(*argv, '/'); 293 if (progname) 294 progname++; 295 else 296 progname = *argv; 297 298 pid = getpid(); 299 while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) { 300 switch (ch) { 301 case 'A': 302 case 'N': 303 case 'O': 304 case 'T': 305 case 'L': 306 if (nfilter >= MAXFILTER) { 307 fatal("Exceeds MAXFILTER"); 308 /*NOTREACHED*/ 309 } 310 filtertype[nfilter] = ch; 311 filter[nfilter++] = allocopy(optarg); 312 break; 313 case 't': 314 ep = NULL; 315 routetag = strtoul(optarg, &ep, 0); 316 if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) { 317 fatal("invalid route tag"); 318 /*NOTREACHED*/ 319 } 320 break; 321 case 'R': 322 if ((rtlog = fopen(optarg, "w")) == NULL) { 323 fatal("Can not write to routelog"); 324 /*NOTREACHED*/ 325 } 326 break; 327 #define FLAG(c, flag, n) case c: do { flag = n; break; } while(0) 328 FLAG('a', aflag, 1); break; 329 FLAG('d', dflag, 1); break; 330 FLAG('D', dflag, 2); break; 331 FLAG('h', hflag, 1); break; 332 FLAG('l', lflag, 1); break; 333 FLAG('n', nflag, 1); break; 334 FLAG('q', qflag, 1); break; 335 FLAG('s', sflag, 1); break; 336 FLAG('S', Sflag, 1); break; 337 #undef FLAG 338 default: 339 fatal("Invalid option specified, terminating"); 340 /*NOTREACHED*/ 341 } 342 } 343 argc -= optind; 344 argv += optind; 345 if (argc > 0) { 346 fatal("bogus extra arguments"); 347 /*NOTREACHED*/ 348 } 349 350 if (geteuid()) { 351 nflag = 1; 352 fprintf(stderr, "No kernel update is allowed\n"); 353 } 354 355 if (dflag == 0) { 356 if (daemon(0, 0) < 0) { 357 fatal("daemon"); 358 /*NOTREACHED*/ 359 } 360 } 361 362 openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON); 363 logopened++; 364 365 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) 366 fatal("malloc"); 367 memset(ripbuf, 0, RIP6_MAXMTU); 368 ripbuf->rip6_cmd = RIP6_RESPONSE; 369 ripbuf->rip6_vers = RIP6_VERSION; 370 ripbuf->rip6_res1[0] = 0; 371 ripbuf->rip6_res1[1] = 0; 372 373 init(); 374 ifconfig(); 375 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 376 if (ifcp->ifc_index < 0) { 377 fprintf(stderr, 378 "No ifindex found at %s (no link-local address?)\n", 379 ifcp->ifc_name); 380 error++; 381 } 382 } 383 if (error) 384 exit(1); 385 if (loopifcp == NULL) { 386 fatal("No loopback found"); 387 /*NOTREACHED*/ 388 } 389 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 390 ifrt(ifcp, 0); 391 filterconfig(); 392 krtread(0); 393 if (dflag) 394 ifrtdump(0); 395 396 #if 1 397 pid = getpid(); 398 if ((pidfile = fopen(ROUTE6D_PID, "w")) != NULL) { 399 fprintf(pidfile, "%d\n", pid); 400 fclose(pidfile); 401 } 402 #endif 403 404 if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) { 405 fatal("malloc"); 406 /*NOTREACHED*/ 407 } 408 memset(ripbuf, 0, RIP6_MAXMTU); 409 ripbuf->rip6_cmd = RIP6_RESPONSE; 410 ripbuf->rip6_vers = RIP6_VERSION; 411 ripbuf->rip6_res1[0] = 0; 412 ripbuf->rip6_res1[1] = 0; 413 414 if (signal(SIGALRM, sighandler) == SIG_ERR || 415 signal(SIGQUIT, sighandler) == SIG_ERR || 416 signal(SIGTERM, sighandler) == SIG_ERR || 417 signal(SIGUSR1, sighandler) == SIG_ERR || 418 signal(SIGHUP, sighandler) == SIG_ERR || 419 signal(SIGINT, sighandler) == SIG_ERR) { 420 fatal("signal"); 421 /*NOTREACHED*/ 422 } 423 /* 424 * To avoid rip packet congestion (not on a cable but in this 425 * process), wait for a moment to send the first RIP6_RESPONSE 426 * packets. 427 */ 428 alarm(ripinterval(INIT_INTERVAL6)); 429 430 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 431 if (iff_find(ifcp, 'N')) 432 continue; 433 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 434 sendrequest(ifcp); 435 } 436 437 syslog(LOG_INFO, "**** Started ****"); 438 sigemptyset(&mask); 439 sigaddset(&mask, SIGALRM); 440 while (1) { 441 if (seenalrm) { 442 ripalarm(); 443 seenalrm = 0; 444 continue; 445 } 446 if (seenquit) { 447 rtdexit(); 448 seenquit = 0; 449 continue; 450 } 451 if (seenusr1) { 452 ifrtdump(SIGUSR1); 453 seenusr1 = 0; 454 continue; 455 } 456 457 #ifdef HAVE_POLL_H 458 switch (poll(set, 2, INFTIM)) 459 #else 460 memcpy(recvecp, sockvecp, fdmasks); 461 switch (select(maxfd + 1, recvecp, 0, 0, 0)) 462 #endif 463 { 464 case -1: 465 if (errno != EINTR) { 466 fatal("select"); 467 /*NOTREACHED*/ 468 } 469 continue; 470 case 0: 471 continue; 472 default: 473 #ifdef HAVE_POLL_H 474 if (set[0].revents & POLLIN) 475 #else 476 if (FD_ISSET(ripsock, recvecp)) 477 #endif 478 { 479 sigprocmask(SIG_BLOCK, &mask, &omask); 480 riprecv(); 481 sigprocmask(SIG_SETMASK, &omask, NULL); 482 } 483 #ifdef HAVE_POLL_H 484 if (set[1].revents & POLLIN) 485 #else 486 if (FD_ISSET(rtsock, recvecp)) 487 #endif 488 { 489 sigprocmask(SIG_BLOCK, &mask, &omask); 490 rtrecv(); 491 sigprocmask(SIG_SETMASK, &omask, NULL); 492 } 493 } 494 } 495 } 496 497 void 498 sighandler(signo) 499 int signo; 500 { 501 502 switch (signo) { 503 case SIGALRM: 504 seenalrm++; 505 break; 506 case SIGQUIT: 507 case SIGTERM: 508 seenquit++; 509 break; 510 case SIGUSR1: 511 case SIGHUP: 512 case SIGINT: 513 seenusr1++; 514 break; 515 } 516 } 517 518 /* 519 * gracefully exits after resetting sockopts. 520 */ 521 /* ARGSUSED */ 522 void 523 rtdexit() 524 { 525 struct riprt *rrt; 526 527 alarm(0); 528 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 529 if (rrt->rrt_rflags & RRTF_AGGREGATE) { 530 delroute(&rrt->rrt_info, &rrt->rrt_gw); 531 } 532 } 533 close(ripsock); 534 close(rtsock); 535 syslog(LOG_INFO, "**** Terminated ****"); 536 closelog(); 537 exit(1); 538 } 539 540 /* 541 * Called periodically: 542 * 1. age out the learned route. remove it if necessary. 543 * 2. submit RIP6_RESPONSE packets. 544 * Invoked in every SUPPLY_INTERVAL6 (30) seconds. I believe we don't have 545 * to invoke this function in every 1 or 5 or 10 seconds only to age the 546 * routes more precisely. 547 */ 548 /* ARGSUSED */ 549 void 550 ripalarm() 551 { 552 struct ifc *ifcp; 553 struct riprt *rrt, *rrt_prev, *rrt_next; 554 time_t t_lifetime, t_holddown; 555 556 /* age the RIP routes */ 557 rrt_prev = 0; 558 t_lifetime = time(NULL) - RIP_LIFETIME; 559 t_holddown = t_lifetime - RIP_HOLDDOWN; 560 for (rrt = riprt; rrt; rrt = rrt_next) { 561 rrt_next = rrt->rrt_next; 562 563 if (rrt->rrt_t == 0) { 564 rrt_prev = rrt; 565 continue; 566 } 567 if (rrt->rrt_t < t_holddown) { 568 if (rrt_prev) { 569 rrt_prev->rrt_next = rrt->rrt_next; 570 } else { 571 riprt = rrt->rrt_next; 572 } 573 delroute(&rrt->rrt_info, &rrt->rrt_gw); 574 free(rrt); 575 continue; 576 } 577 if (rrt->rrt_t < t_lifetime) 578 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 579 rrt_prev = rrt; 580 } 581 /* Supply updates */ 582 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 583 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP)) 584 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 585 } 586 alarm(ripinterval(SUPPLY_INTERVAL6)); 587 } 588 589 void 590 init() 591 { 592 int error; 593 const int int0 = 0, int1 = 1, int255 = 255; 594 struct addrinfo hints, *res; 595 char port[NI_MAXSERV]; 596 597 ifc = (struct ifc *)NULL; 598 nifc = 0; 599 nindex2ifc = 0; /*initial guess*/ 600 index2ifc = NULL; 601 snprintf(port, sizeof(port), "%u", RIP6_PORT); 602 603 memset(&hints, 0, sizeof(hints)); 604 hints.ai_family = PF_INET6; 605 hints.ai_socktype = SOCK_DGRAM; 606 hints.ai_protocol = IPPROTO_UDP; 607 hints.ai_flags = AI_PASSIVE; 608 error = getaddrinfo(NULL, port, &hints, &res); 609 if (error) { 610 fatal("%s", gai_strerror(error)); 611 /*NOTREACHED*/ 612 } 613 if (res->ai_next) { 614 fatal(":: resolved to multiple address"); 615 /*NOTREACHED*/ 616 } 617 618 ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 619 if (ripsock < 0) { 620 fatal("rip socket"); 621 /*NOTREACHED*/ 622 } 623 #ifdef IPV6_V6ONLY 624 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_V6ONLY, 625 &int1, sizeof(int1)) < 0) { 626 fatal("rip IPV6_V6ONLY"); 627 /*NOTREACHED*/ 628 } 629 #endif 630 if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) { 631 fatal("rip bind"); 632 /*NOTREACHED*/ 633 } 634 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, 635 &int255, sizeof(int255)) < 0) { 636 fatal("rip IPV6_MULTICAST_HOPS"); 637 /*NOTREACHED*/ 638 } 639 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, 640 &int0, sizeof(int0)) < 0) { 641 fatal("rip IPV6_MULTICAST_LOOP"); 642 /*NOTREACHED*/ 643 } 644 645 #ifdef IPV6_RECVPKTINFO 646 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, 647 &int1, sizeof(int1)) < 0) { 648 fatal("rip IPV6_RECVPKTINFO"); 649 /*NOTREACHED*/ 650 } 651 #else /* old adv. API */ 652 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, 653 &int1, sizeof(int1)) < 0) { 654 fatal("rip IPV6_PKTINFO"); 655 /*NOTREACHED*/ 656 } 657 #endif 658 659 #ifdef IPV6_RECVPKTINFO 660 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, 661 &int1, sizeof(int1)) < 0) { 662 fatal("rip IPV6_RECVHOPLIMIT"); 663 /*NOTREACHED*/ 664 } 665 #else /* old adv. API */ 666 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_HOPLIMIT, 667 &int1, sizeof(int1)) < 0) { 668 fatal("rip IPV6_HOPLIMIT"); 669 /*NOTREACHED*/ 670 } 671 #endif 672 673 memset(&hints, 0, sizeof(hints)); 674 hints.ai_family = PF_INET6; 675 hints.ai_socktype = SOCK_DGRAM; 676 hints.ai_protocol = IPPROTO_UDP; 677 error = getaddrinfo(RIP6_DEST, port, &hints, &res); 678 if (error) { 679 fatal("%s", gai_strerror(error)); 680 /*NOTREACHED*/ 681 } 682 if (res->ai_next) { 683 fatal("%s resolved to multiple address", RIP6_DEST); 684 /*NOTREACHED*/ 685 } 686 memcpy(&ripsin, res->ai_addr, res->ai_addrlen); 687 688 #ifdef HAVE_POLL_H 689 set[0].fd = ripsock; 690 set[0].events = POLLIN; 691 #else 692 maxfd = ripsock; 693 #endif 694 695 if (nflag == 0) { 696 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) { 697 fatal("route socket"); 698 /*NOTREACHED*/ 699 } 700 #ifdef HAVE_POLL_H 701 set[1].fd = rtsock; 702 set[1].events = POLLIN; 703 #else 704 if (rtsock > maxfd) 705 maxfd = rtsock; 706 #endif 707 } else { 708 #ifdef HAVE_POLL_H 709 set[1].fd = -1; 710 #else 711 rtsock = -1; /*just for safety */ 712 #endif 713 } 714 715 #ifndef HAVE_POLL_H 716 fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask); 717 if ((sockvecp = malloc(fdmasks)) == NULL) { 718 fatal("malloc"); 719 /*NOTREACHED*/ 720 } 721 if ((recvecp = malloc(fdmasks)) == NULL) { 722 fatal("malloc"); 723 /*NOTREACHED*/ 724 } 725 memset(sockvecp, 0, fdmasks); 726 FD_SET(ripsock, sockvecp); 727 if (rtsock >= 0) 728 FD_SET(rtsock, sockvecp); 729 #endif 730 } 731 732 #define RIPSIZE(n) \ 733 (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6)) 734 735 /* 736 * ripflush flushes the rip datagram stored in the rip buffer 737 */ 738 static int nrt; 739 static struct netinfo6 *np; 740 741 void 742 ripflush(ifcp, sin6) 743 struct ifc *ifcp; 744 struct sockaddr_in6 *sin6; 745 { 746 int i; 747 int error; 748 749 if (ifcp) 750 tracet(1, "Send(%s): info(%d) to %s.%d\n", 751 ifcp->ifc_name, nrt, 752 inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port)); 753 else 754 tracet(1, "Send: info(%d) to %s.%d\n", 755 nrt, inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port)); 756 if (dflag >= 2) { 757 np = ripbuf->rip6_nets; 758 for (i = 0; i < nrt; i++, np++) { 759 if (np->rip6_metric == NEXTHOP_METRIC) { 760 if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) 761 trace(2, " NextHop reset"); 762 else { 763 trace(2, " NextHop %s", 764 inet6_n2p(&np->rip6_dest)); 765 } 766 } else { 767 trace(2, " %s/%d[%d]", 768 inet6_n2p(&np->rip6_dest), 769 np->rip6_plen, np->rip6_metric); 770 } 771 if (np->rip6_tag) { 772 trace(2, " tag=0x%04x", 773 ntohs(np->rip6_tag) & 0xffff); 774 } 775 trace(2, "\n"); 776 } 777 } 778 error = sendpacket(sin6, RIPSIZE(nrt)); 779 if (error == EAFNOSUPPORT) { 780 /* Protocol not supported */ 781 tracet(1, "Could not send info to %s (%s): " 782 "set IFF_UP to 0\n", 783 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 784 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 785 } 786 nrt = 0; np = ripbuf->rip6_nets; 787 } 788 789 /* 790 * Generate RIP6_RESPONSE packets and send them. 791 */ 792 void 793 ripsend(ifcp, sin6, flag) 794 struct ifc *ifcp; 795 struct sockaddr_in6 *sin6; 796 int flag; 797 { 798 struct riprt *rrt; 799 struct in6_addr *nh; /* next hop */ 800 int maxrte; 801 802 if (qflag) 803 return; 804 805 if (ifcp == NULL) { 806 /* 807 * Request from non-link local address is not 808 * a regular route6d update. 809 */ 810 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) - 811 sizeof(struct udphdr) - 812 sizeof(struct rip6) + sizeof(struct netinfo6)) / 813 sizeof(struct netinfo6); 814 nrt = 0; np = ripbuf->rip6_nets; nh = NULL; 815 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 816 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 817 continue; 818 /* Put the route to the buffer */ 819 *np = rrt->rrt_info; 820 np++; nrt++; 821 if (nrt == maxrte) { 822 ripflush(NULL, sin6); 823 nh = NULL; 824 } 825 } 826 if (nrt) /* Send last packet */ 827 ripflush(NULL, sin6); 828 return; 829 } 830 831 if ((flag & RRTF_SENDANYWAY) == 0 && 832 (qflag || (ifcp->ifc_flags & IFF_LOOPBACK))) 833 return; 834 835 /* -N: no use */ 836 if (iff_find(ifcp, 'N') != NULL) 837 return; 838 839 /* -T: generate default route only */ 840 if (iff_find(ifcp, 'T') != NULL) { 841 struct netinfo6 rrt_info; 842 memset(&rrt_info, 0, sizeof(struct netinfo6)); 843 rrt_info.rip6_dest = in6addr_any; 844 rrt_info.rip6_plen = 0; 845 rrt_info.rip6_metric = 1; 846 rrt_info.rip6_metric += ifcp->ifc_metric; 847 rrt_info.rip6_tag = htons(routetag & 0xffff); 848 np = ripbuf->rip6_nets; 849 *np = rrt_info; 850 nrt = 1; 851 ripflush(ifcp, sin6); 852 return; 853 } 854 855 maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) - 856 sizeof(struct udphdr) - 857 sizeof(struct rip6) + sizeof(struct netinfo6)) / 858 sizeof(struct netinfo6); 859 860 nrt = 0; np = ripbuf->rip6_nets; nh = NULL; 861 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 862 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 863 continue; 864 865 /* Need to check filter here */ 866 if (out_filter(rrt, ifcp) == 0) 867 continue; 868 869 /* Check split horizon and other conditions */ 870 if (tobeadv(rrt, ifcp) == 0) 871 continue; 872 873 /* Only considers the routes with flag if specified */ 874 if ((flag & RRTF_CHANGED) && 875 (rrt->rrt_rflags & RRTF_CHANGED) == 0) 876 continue; 877 878 /* Check nexthop */ 879 if (rrt->rrt_index == ifcp->ifc_index && 880 !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) && 881 (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) { 882 if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) { 883 if (nrt == maxrte - 2) 884 ripflush(ifcp, sin6); 885 np->rip6_dest = rrt->rrt_gw; 886 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) 887 SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0); 888 np->rip6_plen = 0; 889 np->rip6_tag = 0; 890 np->rip6_metric = NEXTHOP_METRIC; 891 nh = &rrt->rrt_gw; 892 np++; nrt++; 893 } 894 } else if (nh && (rrt->rrt_index != ifcp->ifc_index || 895 !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) || 896 rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) { 897 /* Reset nexthop */ 898 if (nrt == maxrte - 2) 899 ripflush(ifcp, sin6); 900 memset(np, 0, sizeof(struct netinfo6)); 901 np->rip6_metric = NEXTHOP_METRIC; 902 nh = NULL; 903 np++; nrt++; 904 } 905 906 /* Put the route to the buffer */ 907 *np = rrt->rrt_info; 908 np++; nrt++; 909 if (nrt == maxrte) { 910 ripflush(ifcp, sin6); 911 nh = NULL; 912 } 913 } 914 if (nrt) /* Send last packet */ 915 ripflush(ifcp, sin6); 916 } 917 918 /* 919 * outbound filter logic, per-route/interface. 920 */ 921 int 922 out_filter(rrt, ifcp) 923 struct riprt *rrt; 924 struct ifc *ifcp; 925 { 926 struct iff *iffp; 927 struct in6_addr ia; 928 int ok; 929 930 /* 931 * -A: filter out less specific routes, if we have aggregated 932 * route configured. 933 */ 934 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 935 if (iffp->iff_type != 'A') 936 continue; 937 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen) 938 continue; 939 ia = rrt->rrt_info.rip6_dest; 940 applyplen(&ia, iffp->iff_plen); 941 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) 942 return 0; 943 } 944 945 /* 946 * if it is an aggregated route, advertise it only to the 947 * interfaces specified on -A. 948 */ 949 if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) { 950 ok = 0; 951 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 952 if (iffp->iff_type != 'A') 953 continue; 954 if (rrt->rrt_info.rip6_plen == iffp->iff_plen && 955 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 956 &iffp->iff_addr)) { 957 ok = 1; 958 break; 959 } 960 } 961 if (!ok) 962 return 0; 963 } 964 965 /* 966 * -O: advertise only if prefix matches the configured prefix. 967 */ 968 if (iff_find(ifcp, 'O')) { 969 ok = 0; 970 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 971 if (iffp->iff_type != 'O') 972 continue; 973 if (rrt->rrt_info.rip6_plen < iffp->iff_plen) 974 continue; 975 ia = rrt->rrt_info.rip6_dest; 976 applyplen(&ia, iffp->iff_plen); 977 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 978 ok = 1; 979 break; 980 } 981 } 982 if (!ok) 983 return 0; 984 } 985 986 /* the prefix should be advertised */ 987 return 1; 988 } 989 990 /* 991 * Determine if the route is to be advertised on the specified interface. 992 * It checks options specified in the arguments and the split horizon rule. 993 */ 994 int 995 tobeadv(rrt, ifcp) 996 struct riprt *rrt; 997 struct ifc *ifcp; 998 { 999 1000 /* Special care for static routes */ 1001 if (rrt->rrt_flags & RTF_STATIC) { 1002 /* XXX don't advertise reject/blackhole routes */ 1003 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE)) 1004 return 0; 1005 1006 if (Sflag) /* Yes, advertise it anyway */ 1007 return 1; 1008 if (sflag && rrt->rrt_index != ifcp->ifc_index) 1009 return 1; 1010 return 0; 1011 } 1012 /* Regular split horizon */ 1013 if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index) 1014 return 0; 1015 return 1; 1016 } 1017 1018 /* 1019 * Send a rip packet actually. 1020 */ 1021 int 1022 sendpacket(sin6, len) 1023 struct sockaddr_in6 *sin6; 1024 int len; 1025 { 1026 struct msghdr m; 1027 struct cmsghdr *cm; 1028 struct iovec iov[2]; 1029 u_char cmsgbuf[256]; 1030 struct in6_pktinfo *pi; 1031 int idx; 1032 struct sockaddr_in6 sincopy; 1033 1034 /* do not overwrite the given sin */ 1035 sincopy = *sin6; 1036 sin6 = &sincopy; 1037 1038 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) || 1039 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 1040 /* XXX: do not mix the interface index and link index */ 1041 idx = IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr); 1042 SET_IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr, 0); 1043 sin6->sin6_scope_id = idx; 1044 } else 1045 idx = 0; 1046 1047 m.msg_name = (caddr_t)sin6; 1048 m.msg_namelen = sizeof(*sin6); 1049 iov[0].iov_base = (caddr_t)ripbuf; 1050 iov[0].iov_len = len; 1051 m.msg_iov = iov; 1052 m.msg_iovlen = 1; 1053 if (!idx) { 1054 m.msg_control = NULL; 1055 m.msg_controllen = 0; 1056 } else { 1057 memset(cmsgbuf, 0, sizeof(cmsgbuf)); 1058 cm = (struct cmsghdr *)cmsgbuf; 1059 m.msg_control = (caddr_t)cm; 1060 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); 1061 1062 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 1063 cm->cmsg_level = IPPROTO_IPV6; 1064 cm->cmsg_type = IPV6_PKTINFO; 1065 pi = (struct in6_pktinfo *)CMSG_DATA(cm); 1066 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/ 1067 pi->ipi6_ifindex = idx; 1068 } 1069 1070 if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) { 1071 trace(1, "sendmsg: %s\n", strerror(errno)); 1072 return errno; 1073 } 1074 1075 return 0; 1076 } 1077 1078 /* 1079 * Receive and process RIP packets. Update the routes/kernel forwarding 1080 * table if necessary. 1081 */ 1082 void 1083 riprecv() 1084 { 1085 struct ifc *ifcp, *ic; 1086 struct sockaddr_in6 fsock; 1087 struct in6_addr nh; /* next hop */ 1088 struct rip6 *rp; 1089 struct netinfo6 *np, *nq; 1090 struct riprt *rrt; 1091 ssize_t len, nn; 1092 unsigned int need_trigger, idx; 1093 char buf[4 * RIP6_MAXMTU]; 1094 time_t t; 1095 struct msghdr m; 1096 struct cmsghdr *cm; 1097 struct iovec iov[2]; 1098 u_char cmsgbuf[256]; 1099 struct in6_pktinfo *pi = NULL; 1100 int *hlimp = NULL; 1101 struct iff *iffp; 1102 struct in6_addr ia; 1103 int ok; 1104 time_t t_half_lifetime; 1105 1106 need_trigger = 0; 1107 1108 m.msg_name = (caddr_t)&fsock; 1109 m.msg_namelen = sizeof(fsock); 1110 iov[0].iov_base = (caddr_t)buf; 1111 iov[0].iov_len = sizeof(buf); 1112 m.msg_iov = iov; 1113 m.msg_iovlen = 1; 1114 cm = (struct cmsghdr *)cmsgbuf; 1115 m.msg_control = (caddr_t)cm; 1116 m.msg_controllen = sizeof(cmsgbuf); 1117 if ((len = recvmsg(ripsock, &m, 0)) < 0) { 1118 fatal("recvmsg"); 1119 /*NOTREACHED*/ 1120 } 1121 idx = 0; 1122 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m); 1123 cm; 1124 cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) { 1125 if (cm->cmsg_level != IPPROTO_IPV6) 1126 continue; 1127 switch (cm->cmsg_type) { 1128 case IPV6_PKTINFO: 1129 if (cm->cmsg_len != CMSG_LEN(sizeof(*pi))) { 1130 trace(1, 1131 "invalid cmsg length for IPV6_PKTINFO\n"); 1132 return; 1133 } 1134 pi = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1135 idx = pi->ipi6_ifindex; 1136 break; 1137 case IPV6_HOPLIMIT: 1138 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) { 1139 trace(1, 1140 "invalid cmsg length for IPV6_HOPLIMIT\n"); 1141 return; 1142 } 1143 hlimp = (int *)CMSG_DATA(cm); 1144 break; 1145 } 1146 } 1147 if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) 1148 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx); 1149 1150 if (len < sizeof(struct rip6)) { 1151 trace(1, "Packet too short\n"); 1152 return; 1153 } 1154 1155 if (pi == NULL || hlimp == NULL) { 1156 /* 1157 * This can happen when the kernel failed to allocate memory 1158 * for the ancillary data. Although we might be able to handle 1159 * some cases without this info, those are minor and not so 1160 * important, so it's better to discard the packet for safer 1161 * operation. 1162 */ 1163 trace(1, "IPv6 packet information cannot be retrieved\n"); 1164 return; 1165 } 1166 1167 nh = fsock.sin6_addr; 1168 nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) / 1169 sizeof(struct netinfo6); 1170 rp = (struct rip6 *)buf; 1171 np = rp->rip6_nets; 1172 1173 if (rp->rip6_vers != RIP6_VERSION) { 1174 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers); 1175 return; 1176 } 1177 if (rp->rip6_cmd == RIP6_REQUEST) { 1178 if (idx && idx < nindex2ifc) { 1179 ifcp = index2ifc[idx]; 1180 riprequest(ifcp, np, nn, &fsock); 1181 } else { 1182 riprequest(NULL, np, nn, &fsock); 1183 } 1184 return; 1185 } 1186 1187 if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) { 1188 trace(1, "Response from non-ll addr: %s\n", 1189 inet6_n2p(&fsock.sin6_addr)); 1190 return; /* Ignore packets from non-link-local addr */ 1191 } 1192 if (ntohs(fsock.sin6_port) != RIP6_PORT) { 1193 trace(1, "Response from non-rip port from %s\n", 1194 inet6_n2p(&fsock.sin6_addr)); 1195 return; 1196 } 1197 if (IN6_IS_ADDR_MULTICAST(&pi->ipi6_addr) && *hlimp != 255) { 1198 trace(1, 1199 "Response packet with a smaller hop limit (%d) from %s\n", 1200 *hlimp, inet6_n2p(&fsock.sin6_addr)); 1201 return; 1202 } 1203 /* 1204 * Further validation: since this program does not send off-link 1205 * requests, an incoming response must always come from an on-link 1206 * node. Although this is normally ensured by the source address 1207 * check above, it may not 100% be safe because there are router 1208 * implementations that (invalidly) allow a packet with a link-local 1209 * source address to be forwarded to a different link. 1210 * So we also check whether the destination address is a link-local 1211 * address or the hop limit is 255. Note that RFC2080 does not require 1212 * the specific hop limit for a unicast response, so we cannot assume 1213 * the limitation. 1214 */ 1215 if (!IN6_IS_ADDR_LINKLOCAL(&pi->ipi6_addr) && *hlimp != 255) { 1216 trace(1, 1217 "Response packet possibly from an off-link node: " 1218 "from %s to %s hlim=%d\n", 1219 inet6_n2p(&fsock.sin6_addr), 1220 inet6_n2p(&pi->ipi6_addr), *hlimp); 1221 return; 1222 } 1223 1224 idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr); 1225 ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL; 1226 if (!ifcp) { 1227 trace(1, "Packets to unknown interface index %d\n", idx); 1228 return; /* Ignore it */ 1229 } 1230 if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr)) 1231 return; /* The packet is from me; ignore */ 1232 if (rp->rip6_cmd != RIP6_RESPONSE) { 1233 trace(1, "Invalid command %d\n", rp->rip6_cmd); 1234 return; 1235 } 1236 1237 /* -N: no use */ 1238 if (iff_find(ifcp, 'N') != NULL) 1239 return; 1240 1241 tracet(1, "Recv(%s): from %s.%d info(%d)\n", 1242 ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn); 1243 1244 t = time(NULL); 1245 t_half_lifetime = t - (RIP_LIFETIME/2); 1246 for (; nn; nn--, np++) { 1247 if (np->rip6_metric == NEXTHOP_METRIC) { 1248 /* modify neighbor address */ 1249 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1250 nh = np->rip6_dest; 1251 SET_IN6_LINKLOCAL_IFINDEX(nh, idx); 1252 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1253 } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) { 1254 nh = fsock.sin6_addr; 1255 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh)); 1256 } else { 1257 nh = fsock.sin6_addr; 1258 trace(1, "\tInvalid Nexthop: %s\n", 1259 inet6_n2p(&np->rip6_dest)); 1260 } 1261 continue; 1262 } 1263 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) { 1264 trace(1, "\tMulticast netinfo6: %s/%d [%d]\n", 1265 inet6_n2p(&np->rip6_dest), 1266 np->rip6_plen, np->rip6_metric); 1267 continue; 1268 } 1269 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) { 1270 trace(1, "\tLoopback netinfo6: %s/%d [%d]\n", 1271 inet6_n2p(&np->rip6_dest), 1272 np->rip6_plen, np->rip6_metric); 1273 continue; 1274 } 1275 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) { 1276 trace(1, "\tLink Local netinfo6: %s/%d [%d]\n", 1277 inet6_n2p(&np->rip6_dest), 1278 np->rip6_plen, np->rip6_metric); 1279 continue; 1280 } 1281 /* may need to pass sitelocal prefix in some case, however*/ 1282 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) { 1283 trace(1, "\tSite Local netinfo6: %s/%d [%d]\n", 1284 inet6_n2p(&np->rip6_dest), 1285 np->rip6_plen, np->rip6_metric); 1286 continue; 1287 } 1288 trace(2, "\tnetinfo6: %s/%d [%d]", 1289 inet6_n2p(&np->rip6_dest), 1290 np->rip6_plen, np->rip6_metric); 1291 if (np->rip6_tag) 1292 trace(2, " tag=0x%04x", ntohs(np->rip6_tag) & 0xffff); 1293 if (dflag >= 2) { 1294 ia = np->rip6_dest; 1295 applyplen(&ia, np->rip6_plen); 1296 if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest)) 1297 trace(2, " [junk outside prefix]"); 1298 } 1299 1300 /* 1301 * -L: listen only if the prefix matches the configuration 1302 */ 1303 ok = 1; /* if there's no L filter, it is ok */ 1304 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 1305 if (iffp->iff_type != 'L') 1306 continue; 1307 ok = 0; 1308 if (np->rip6_plen < iffp->iff_plen) 1309 continue; 1310 /* special rule: ::/0 means default, not "in /0" */ 1311 if (iffp->iff_plen == 0 && np->rip6_plen > 0) 1312 continue; 1313 ia = np->rip6_dest; 1314 applyplen(&ia, iffp->iff_plen); 1315 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) { 1316 ok = 1; 1317 break; 1318 } 1319 } 1320 if (!ok) { 1321 trace(2, " (filtered)\n"); 1322 continue; 1323 } 1324 1325 trace(2, "\n"); 1326 np->rip6_metric++; 1327 np->rip6_metric += ifcp->ifc_metric; 1328 if (np->rip6_metric > HOPCNT_INFINITY6) 1329 np->rip6_metric = HOPCNT_INFINITY6; 1330 1331 applyplen(&np->rip6_dest, np->rip6_plen); 1332 if ((rrt = rtsearch(np, NULL)) != NULL) { 1333 if (rrt->rrt_t == 0) 1334 continue; /* Intf route has priority */ 1335 nq = &rrt->rrt_info; 1336 if (nq->rip6_metric > np->rip6_metric) { 1337 if (rrt->rrt_index == ifcp->ifc_index && 1338 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1339 /* Small metric from the same gateway */ 1340 nq->rip6_metric = np->rip6_metric; 1341 } else { 1342 /* Better route found */ 1343 rrt->rrt_index = ifcp->ifc_index; 1344 /* Update routing table */ 1345 delroute(nq, &rrt->rrt_gw); 1346 rrt->rrt_gw = nh; 1347 *nq = *np; 1348 addroute(rrt, &nh, ifcp); 1349 } 1350 rrt->rrt_rflags |= RRTF_CHANGED; 1351 rrt->rrt_t = t; 1352 need_trigger = 1; 1353 } else if (nq->rip6_metric < np->rip6_metric && 1354 rrt->rrt_index == ifcp->ifc_index && 1355 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1356 /* Got worse route from same gw */ 1357 nq->rip6_metric = np->rip6_metric; 1358 rrt->rrt_t = t; 1359 rrt->rrt_rflags |= RRTF_CHANGED; 1360 need_trigger = 1; 1361 } else if (nq->rip6_metric == np->rip6_metric && 1362 np->rip6_metric < HOPCNT_INFINITY6) { 1363 if (rrt->rrt_index == ifcp->ifc_index && 1364 IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) { 1365 /* same metric, same route from same gw */ 1366 rrt->rrt_t = t; 1367 } else if (rrt->rrt_t < t_half_lifetime) { 1368 /* Better route found */ 1369 rrt->rrt_index = ifcp->ifc_index; 1370 /* Update routing table */ 1371 delroute(nq, &rrt->rrt_gw); 1372 rrt->rrt_gw = nh; 1373 *nq = *np; 1374 addroute(rrt, &nh, ifcp); 1375 rrt->rrt_rflags |= RRTF_CHANGED; 1376 rrt->rrt_t = t; 1377 } 1378 } 1379 /* 1380 * if nq->rip6_metric == HOPCNT_INFINITY6 then 1381 * do not update age value. Do nothing. 1382 */ 1383 } else if (np->rip6_metric < HOPCNT_INFINITY6) { 1384 /* Got a new valid route */ 1385 if ((rrt = MALLOC(struct riprt)) == NULL) { 1386 fatal("malloc: struct riprt"); 1387 /*NOTREACHED*/ 1388 } 1389 memset(rrt, 0, sizeof(*rrt)); 1390 nq = &rrt->rrt_info; 1391 1392 rrt->rrt_same = NULL; 1393 rrt->rrt_index = ifcp->ifc_index; 1394 rrt->rrt_flags = RTF_UP|RTF_GATEWAY; 1395 rrt->rrt_gw = nh; 1396 *nq = *np; 1397 applyplen(&nq->rip6_dest, nq->rip6_plen); 1398 if (nq->rip6_plen == sizeof(struct in6_addr) * 8) 1399 rrt->rrt_flags |= RTF_HOST; 1400 1401 /* Put the route to the list */ 1402 rrt->rrt_next = riprt; 1403 riprt = rrt; 1404 /* Update routing table */ 1405 addroute(rrt, &nh, ifcp); 1406 rrt->rrt_rflags |= RRTF_CHANGED; 1407 need_trigger = 1; 1408 rrt->rrt_t = t; 1409 } 1410 } 1411 /* XXX need to care the interval between triggered updates */ 1412 if (need_trigger) { 1413 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) { 1414 for (ic = ifc; ic; ic = ic->ifc_next) { 1415 if (ifcp->ifc_index == ic->ifc_index) 1416 continue; 1417 if (ic->ifc_flags & IFF_UP) 1418 ripsend(ic, &ic->ifc_ripsin, 1419 RRTF_CHANGED); 1420 } 1421 } 1422 /* Reset the flag */ 1423 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1424 rrt->rrt_rflags &= ~RRTF_CHANGED; 1425 } 1426 } 1427 1428 /* 1429 * Send all routes request packet to the specified interface. 1430 */ 1431 void 1432 sendrequest(ifcp) 1433 struct ifc *ifcp; 1434 { 1435 struct netinfo6 *np; 1436 int error; 1437 1438 if (ifcp->ifc_flags & IFF_LOOPBACK) 1439 return; 1440 ripbuf->rip6_cmd = RIP6_REQUEST; 1441 np = ripbuf->rip6_nets; 1442 memset(np, 0, sizeof(struct netinfo6)); 1443 np->rip6_metric = HOPCNT_INFINITY6; 1444 tracet(1, "Send rtdump Request to %s (%s)\n", 1445 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1446 error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1)); 1447 if (error == EAFNOSUPPORT) { 1448 /* Protocol not supported */ 1449 tracet(1, "Could not send rtdump Request to %s (%s): " 1450 "set IFF_UP to 0\n", 1451 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr)); 1452 ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */ 1453 } 1454 ripbuf->rip6_cmd = RIP6_RESPONSE; 1455 } 1456 1457 /* 1458 * Process a RIP6_REQUEST packet. 1459 */ 1460 void 1461 riprequest(ifcp, np, nn, sin6) 1462 struct ifc *ifcp; 1463 struct netinfo6 *np; 1464 int nn; 1465 struct sockaddr_in6 *sin6; 1466 { 1467 int i; 1468 struct riprt *rrt; 1469 1470 if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) && 1471 np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) { 1472 /* Specific response, don't split-horizon */ 1473 trace(1, "\tRIP Request\n"); 1474 for (i = 0; i < nn; i++, np++) { 1475 rrt = rtsearch(np, NULL); 1476 if (rrt) 1477 np->rip6_metric = rrt->rrt_info.rip6_metric; 1478 else 1479 np->rip6_metric = HOPCNT_INFINITY6; 1480 } 1481 (void)sendpacket(sin6, RIPSIZE(nn)); 1482 return; 1483 } 1484 /* Whole routing table dump */ 1485 trace(1, "\tRIP Request -- whole routing table\n"); 1486 ripsend(ifcp, sin6, RRTF_SENDANYWAY); 1487 } 1488 1489 /* 1490 * Get information of each interface. 1491 */ 1492 void 1493 ifconfig() 1494 { 1495 struct ifaddrs *ifap, *ifa; 1496 struct ifc *ifcp; 1497 struct ipv6_mreq mreq; 1498 int s; 1499 1500 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 1501 fatal("socket"); 1502 /*NOTREACHED*/ 1503 } 1504 1505 if (getifaddrs(&ifap) != 0) { 1506 fatal("getifaddrs"); 1507 /*NOTREACHED*/ 1508 } 1509 1510 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 1511 if (ifa->ifa_addr->sa_family != AF_INET6) 1512 continue; 1513 ifcp = ifc_find(ifa->ifa_name); 1514 /* we are interested in multicast-capable interfaces */ 1515 if ((ifa->ifa_flags & IFF_MULTICAST) == 0) 1516 continue; 1517 if (!ifcp) { 1518 /* new interface */ 1519 if ((ifcp = MALLOC(struct ifc)) == NULL) { 1520 fatal("malloc: struct ifc"); 1521 /*NOTREACHED*/ 1522 } 1523 memset(ifcp, 0, sizeof(*ifcp)); 1524 ifcp->ifc_index = -1; 1525 ifcp->ifc_next = ifc; 1526 ifc = ifcp; 1527 nifc++; 1528 ifcp->ifc_name = allocopy(ifa->ifa_name); 1529 ifcp->ifc_addr = 0; 1530 ifcp->ifc_filter = 0; 1531 ifcp->ifc_flags = ifa->ifa_flags; 1532 trace(1, "newif %s <%s>\n", ifcp->ifc_name, 1533 ifflags(ifcp->ifc_flags)); 1534 if (!strcmp(ifcp->ifc_name, LOOPBACK_IF)) 1535 loopifcp = ifcp; 1536 } else { 1537 /* update flag, this may be up again */ 1538 if (ifcp->ifc_flags != ifa->ifa_flags) { 1539 trace(1, "%s: <%s> -> ", ifcp->ifc_name, 1540 ifflags(ifcp->ifc_flags)); 1541 trace(1, "<%s>\n", ifflags(ifa->ifa_flags)); 1542 ifcp->ifc_cflags |= IFC_CHANGED; 1543 } 1544 ifcp->ifc_flags = ifa->ifa_flags; 1545 } 1546 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s); 1547 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP 1548 && 0 < ifcp->ifc_index && !ifcp->ifc_joined) { 1549 mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr; 1550 mreq.ipv6mr_interface = ifcp->ifc_index; 1551 if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP, 1552 &mreq, sizeof(mreq)) < 0) { 1553 fatal("IPV6_JOIN_GROUP"); 1554 /*NOTREACHED*/ 1555 } 1556 trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST); 1557 ifcp->ifc_joined++; 1558 } 1559 } 1560 close(s); 1561 freeifaddrs(ifap); 1562 } 1563 1564 void 1565 ifconfig1(name, sa, ifcp, s) 1566 const char *name; 1567 const struct sockaddr *sa; 1568 struct ifc *ifcp; 1569 int s; 1570 { 1571 struct in6_ifreq ifr; 1572 const struct sockaddr_in6 *sin6; 1573 struct ifac *ifa; 1574 int plen; 1575 char buf[BUFSIZ]; 1576 1577 sin6 = (const struct sockaddr_in6 *)sa; 1578 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) && !lflag) 1579 return; 1580 ifr.ifr_addr = *sin6; 1581 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 1582 if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) { 1583 fatal("ioctl: SIOCGIFNETMASK_IN6"); 1584 /*NOTREACHED*/ 1585 } 1586 plen = sin6mask2len(&ifr.ifr_addr); 1587 if ((ifa = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) { 1588 /* same interface found */ 1589 /* need check if something changed */ 1590 /* XXX not yet implemented */ 1591 return; 1592 } 1593 /* 1594 * New address is found 1595 */ 1596 if ((ifa = MALLOC(struct ifac)) == NULL) { 1597 fatal("malloc: struct ifac"); 1598 /*NOTREACHED*/ 1599 } 1600 memset(ifa, 0, sizeof(*ifa)); 1601 ifa->ifa_conf = ifcp; 1602 ifa->ifa_next = ifcp->ifc_addr; 1603 ifcp->ifc_addr = ifa; 1604 ifa->ifa_addr = sin6->sin6_addr; 1605 ifa->ifa_plen = plen; 1606 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 1607 ifr.ifr_addr = *sin6; 1608 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) { 1609 fatal("ioctl: SIOCGIFDSTADDR_IN6"); 1610 /*NOTREACHED*/ 1611 } 1612 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr; 1613 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf)); 1614 trace(1, "found address %s/%d -- %s\n", 1615 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf); 1616 } else { 1617 trace(1, "found address %s/%d\n", 1618 inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen); 1619 } 1620 if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 1621 ifcp->ifc_mylladdr = ifa->ifa_addr; 1622 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr); 1623 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len); 1624 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr, 1625 ifcp->ifc_index); 1626 setindex2ifc(ifcp->ifc_index, ifcp); 1627 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index); 1628 if (ifcp->ifc_mtu > RIP6_MAXMTU) 1629 ifcp->ifc_mtu = RIP6_MAXMTU; 1630 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) { 1631 fatal("ioctl: SIOCGIFMETRIC"); 1632 /*NOTREACHED*/ 1633 } 1634 ifcp->ifc_metric = ifr.ifr_metric; 1635 trace(1, "\tindex: %d, mtu: %d, metric: %d\n", 1636 ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric); 1637 } else 1638 ifcp->ifc_cflags |= IFC_CHANGED; 1639 } 1640 1641 /* 1642 * Receive and process routing messages. 1643 * Update interface information as necesssary. 1644 */ 1645 void 1646 rtrecv() 1647 { 1648 char buf[BUFSIZ]; 1649 char *p, *q; 1650 struct rt_msghdr *rtm; 1651 struct ifa_msghdr *ifam; 1652 struct if_msghdr *ifm; 1653 int len; 1654 struct ifc *ifcp, *ic; 1655 int iface = 0, rtable = 0; 1656 struct sockaddr_in6 *rta[RTAX_MAX]; 1657 struct sockaddr_in6 mask; 1658 int i, addrs; 1659 struct riprt *rrt; 1660 1661 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 1662 perror("read from rtsock"); 1663 exit(1); 1664 } 1665 if (len < sizeof(*rtm)) { 1666 trace(1, "short read from rtsock: %d (should be > %lu)\n", 1667 len, (u_long)sizeof(*rtm)); 1668 return; 1669 } 1670 if (dflag >= 2) { 1671 fprintf(stderr, "rtmsg:\n"); 1672 for (i = 0; i < len; i++) { 1673 fprintf(stderr, "%02x ", buf[i] & 0xff); 1674 if (i % 16 == 15) fprintf(stderr, "\n"); 1675 } 1676 fprintf(stderr, "\n"); 1677 } 1678 1679 for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) { 1680 /* safety against bogus message */ 1681 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) { 1682 trace(1, "bogus rtmsg: length=%d\n", 1683 ((struct rt_msghdr *)p)->rtm_msglen); 1684 break; 1685 } 1686 rtm = NULL; 1687 ifam = NULL; 1688 ifm = NULL; 1689 switch (((struct rt_msghdr *)p)->rtm_type) { 1690 case RTM_NEWADDR: 1691 case RTM_DELADDR: 1692 ifam = (struct ifa_msghdr *)p; 1693 addrs = ifam->ifam_addrs; 1694 q = (char *)(ifam + 1); 1695 break; 1696 case RTM_IFINFO: 1697 ifm = (struct if_msghdr *)p; 1698 addrs = ifm->ifm_addrs; 1699 q = (char *)(ifm + 1); 1700 break; 1701 default: 1702 rtm = (struct rt_msghdr *)p; 1703 addrs = rtm->rtm_addrs; 1704 q = (char *)(rtm + 1); 1705 if (rtm->rtm_version != RTM_VERSION) { 1706 trace(1, "unexpected rtmsg version %d " 1707 "(should be %d)\n", 1708 rtm->rtm_version, RTM_VERSION); 1709 continue; 1710 } 1711 if (rtm->rtm_pid == pid) { 1712 #if 0 1713 trace(1, "rtmsg looped back to me, ignored\n"); 1714 #endif 1715 continue; 1716 } 1717 break; 1718 } 1719 memset(&rta, 0, sizeof(rta)); 1720 for (i = 0; i < RTAX_MAX; i++) { 1721 if (addrs & (1 << i)) { 1722 rta[i] = (struct sockaddr_in6 *)q; 1723 q += ROUNDUP(rta[i]->sin6_len); 1724 } 1725 } 1726 1727 trace(1, "rtsock: %s (addrs=%x)\n", 1728 rttypes((struct rt_msghdr *)p), addrs); 1729 if (dflag >= 2) { 1730 for (i = 0; 1731 i < ((struct rt_msghdr *)p)->rtm_msglen; 1732 i++) { 1733 fprintf(stderr, "%02x ", p[i] & 0xff); 1734 if (i % 16 == 15) fprintf(stderr, "\n"); 1735 } 1736 fprintf(stderr, "\n"); 1737 } 1738 1739 /* 1740 * Easy ones first. 1741 * 1742 * We may be able to optimize by using ifm->ifm_index or 1743 * ifam->ifam_index. For simplicity we don't do that here. 1744 */ 1745 switch (((struct rt_msghdr *)p)->rtm_type) { 1746 case RTM_NEWADDR: 1747 case RTM_IFINFO: 1748 iface++; 1749 continue; 1750 case RTM_ADD: 1751 rtable++; 1752 continue; 1753 case RTM_LOSING: 1754 case RTM_MISS: 1755 case RTM_RESOLVE: 1756 case RTM_GET: 1757 case RTM_LOCK: 1758 /* nothing to be done here */ 1759 trace(1, "\tnothing to be done, ignored\n"); 1760 continue; 1761 } 1762 1763 #if 0 1764 if (rta[RTAX_DST] == NULL) { 1765 trace(1, "\tno destination, ignored\n"); 1766 continue; 1767 } 1768 if (rta[RTAX_DST]->sin6_family != AF_INET6) { 1769 trace(1, "\taf mismatch, ignored\n"); 1770 continue; 1771 } 1772 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) { 1773 trace(1, "\tlinklocal destination, ignored\n"); 1774 continue; 1775 } 1776 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) { 1777 trace(1, "\tloopback destination, ignored\n"); 1778 continue; /* Loopback */ 1779 } 1780 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) { 1781 trace(1, "\tmulticast destination, ignored\n"); 1782 continue; 1783 } 1784 #endif 1785 1786 /* hard ones */ 1787 switch (((struct rt_msghdr *)p)->rtm_type) { 1788 case RTM_NEWADDR: 1789 case RTM_IFINFO: 1790 case RTM_ADD: 1791 case RTM_LOSING: 1792 case RTM_MISS: 1793 case RTM_RESOLVE: 1794 case RTM_GET: 1795 case RTM_LOCK: 1796 /* should already be handled */ 1797 fatal("rtrecv: never reach here"); 1798 /*NOTREACHED*/ 1799 case RTM_DELETE: 1800 if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) { 1801 trace(1, "\tsome of dst/gw/netamsk are " 1802 "unavailable, ignored\n"); 1803 break; 1804 } 1805 if ((rtm->rtm_flags & RTF_HOST) != 0) { 1806 mask.sin6_len = sizeof(mask); 1807 memset(&mask.sin6_addr, 0xff, 1808 sizeof(mask.sin6_addr)); 1809 rta[RTAX_NETMASK] = &mask; 1810 } else if (!rta[RTAX_NETMASK]) { 1811 trace(1, "\tsome of dst/gw/netamsk are " 1812 "unavailable, ignored\n"); 1813 break; 1814 } 1815 if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY], 1816 rta[RTAX_NETMASK]) == 0) { 1817 rtable++; /*just to be sure*/ 1818 } 1819 break; 1820 case RTM_CHANGE: 1821 case RTM_REDIRECT: 1822 trace(1, "\tnot supported yet, ignored\n"); 1823 break; 1824 case RTM_DELADDR: 1825 if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) { 1826 trace(1, "\tno netmask or ifa given, ignored\n"); 1827 break; 1828 } 1829 if (ifam->ifam_index < nindex2ifc) 1830 ifcp = index2ifc[ifam->ifam_index]; 1831 else 1832 ifcp = NULL; 1833 if (!ifcp) { 1834 trace(1, "\tinvalid ifam_index %d, ignored\n", 1835 ifam->ifam_index); 1836 break; 1837 } 1838 if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK])) 1839 iface++; 1840 break; 1841 case RTM_OLDADD: 1842 case RTM_OLDDEL: 1843 trace(1, "\tnot supported yet, ignored\n"); 1844 break; 1845 } 1846 1847 } 1848 1849 if (iface) { 1850 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n"); 1851 ifconfig(); 1852 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 1853 if (ifcp->ifc_cflags & IFC_CHANGED) { 1854 if (ifrt(ifcp, 1)) { 1855 for (ic = ifc; ic; ic = ic->ifc_next) { 1856 if (ifcp->ifc_index == ic->ifc_index) 1857 continue; 1858 if (ic->ifc_flags & IFF_UP) 1859 ripsend(ic, &ic->ifc_ripsin, 1860 RRTF_CHANGED); 1861 } 1862 /* Reset the flag */ 1863 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1864 rrt->rrt_rflags &= ~RRTF_CHANGED; 1865 } 1866 ifcp->ifc_cflags &= ~IFC_CHANGED; 1867 } 1868 } 1869 if (rtable) { 1870 trace(1, "rtsock: read routing table again\n"); 1871 krtread(1); 1872 } 1873 } 1874 1875 /* 1876 * remove specified route from the internal routing table. 1877 */ 1878 int 1879 rt_del(sdst, sgw, smask) 1880 const struct sockaddr_in6 *sdst; 1881 const struct sockaddr_in6 *sgw; 1882 const struct sockaddr_in6 *smask; 1883 { 1884 const struct in6_addr *dst = NULL; 1885 const struct in6_addr *gw = NULL; 1886 int prefix; 1887 struct netinfo6 ni6; 1888 struct riprt *rrt = NULL; 1889 time_t t_lifetime; 1890 1891 if (sdst->sin6_family != AF_INET6) { 1892 trace(1, "\tother AF, ignored\n"); 1893 return -1; 1894 } 1895 if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr) 1896 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback) 1897 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) { 1898 trace(1, "\taddress %s not interesting, ignored\n", 1899 inet6_n2p(&sdst->sin6_addr)); 1900 return -1; 1901 } 1902 dst = &sdst->sin6_addr; 1903 if (sgw->sin6_family == AF_INET6) { 1904 /* easy case */ 1905 gw = &sgw->sin6_addr; 1906 prefix = sin6mask2len(smask); 1907 } else if (sgw->sin6_family == AF_LINK) { 1908 /* 1909 * Interface route... a hard case. We need to get the prefix 1910 * length from the kernel, but we now are parsing rtmsg. 1911 * We'll purge matching routes from my list, then get the 1912 * fresh list. 1913 */ 1914 struct riprt *longest; 1915 trace(1, "\t%s is an interface route, guessing prefixlen\n", 1916 inet6_n2p(dst)); 1917 longest = NULL; 1918 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 1919 if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 1920 &sdst->sin6_addr) 1921 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) { 1922 if (!longest 1923 || longest->rrt_info.rip6_plen < 1924 rrt->rrt_info.rip6_plen) { 1925 longest = rrt; 1926 } 1927 } 1928 } 1929 rrt = longest; 1930 if (!rrt) { 1931 trace(1, "\tno matching interface route found\n"); 1932 return -1; 1933 } 1934 gw = &in6addr_loopback; 1935 prefix = rrt->rrt_info.rip6_plen; 1936 } else { 1937 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family); 1938 return -1; 1939 } 1940 1941 trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix); 1942 trace(1, "gw %s\n", inet6_n2p(gw)); 1943 t_lifetime = time(NULL) - RIP_LIFETIME; 1944 /* age route for interface address */ 1945 memset(&ni6, 0, sizeof(ni6)); 1946 ni6.rip6_dest = *dst; 1947 ni6.rip6_plen = prefix; 1948 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 1949 trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest), 1950 ni6.rip6_plen); 1951 if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) { 1952 trace(1, "\tno route found\n"); 1953 return -1; 1954 } 1955 #if 0 1956 if ((rrt->rrt_flags & RTF_STATIC) == 0) { 1957 trace(1, "\tyou can delete static routes only\n"); 1958 } else 1959 #endif 1960 if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) { 1961 trace(1, "\tgw mismatch: %s <-> ", 1962 inet6_n2p(&rrt->rrt_gw)); 1963 trace(1, "%s\n", inet6_n2p(gw)); 1964 } else { 1965 trace(1, "\troute found, age it\n"); 1966 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1967 rrt->rrt_t = t_lifetime; 1968 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 1969 } 1970 } 1971 return 0; 1972 } 1973 1974 /* 1975 * remove specified address from internal interface/routing table. 1976 */ 1977 int 1978 rt_deladdr(ifcp, sifa, smask) 1979 struct ifc *ifcp; 1980 const struct sockaddr_in6 *sifa; 1981 const struct sockaddr_in6 *smask; 1982 { 1983 const struct in6_addr *addr = NULL; 1984 int prefix; 1985 struct ifac *ifa = NULL; 1986 struct netinfo6 ni6; 1987 struct riprt *rrt = NULL; 1988 time_t t_lifetime; 1989 int updated = 0; 1990 1991 if (sifa->sin6_family != AF_INET6) { 1992 trace(1, "\tother AF, ignored\n"); 1993 return -1; 1994 } 1995 addr = &sifa->sin6_addr; 1996 prefix = sin6mask2len(smask); 1997 1998 trace(1, "\tdeleting %s/%d from %s\n", 1999 inet6_n2p(addr), prefix, ifcp->ifc_name); 2000 ifa = ifa_match(ifcp, addr, prefix); 2001 if (!ifa) { 2002 trace(1, "\tno matching ifa found for %s/%d on %s\n", 2003 inet6_n2p(addr), prefix, ifcp->ifc_name); 2004 return -1; 2005 } 2006 if (ifa->ifa_conf != ifcp) { 2007 trace(1, "\taddress table corrupt: back pointer does not match " 2008 "(%s != %s)\n", 2009 ifcp->ifc_name, ifa->ifa_conf->ifc_name); 2010 return -1; 2011 } 2012 /* remove ifa from interface */ 2013 if (ifcp->ifc_addr == ifa) 2014 ifcp->ifc_addr = ifa->ifa_next; 2015 else { 2016 struct ifac *p; 2017 for (p = ifcp->ifc_addr; p; p = p->ifa_next) { 2018 if (p->ifa_next == ifa) { 2019 p->ifa_next = ifa->ifa_next; 2020 break; 2021 } 2022 } 2023 } 2024 ifa->ifa_next = NULL; 2025 ifa->ifa_conf = NULL; 2026 t_lifetime = time(NULL) - RIP_LIFETIME; 2027 /* age route for interface address */ 2028 memset(&ni6, 0, sizeof(ni6)); 2029 ni6.rip6_dest = ifa->ifa_addr; 2030 ni6.rip6_plen = ifa->ifa_plen; 2031 applyplen(&ni6.rip6_dest, ni6.rip6_plen); 2032 trace(1, "\tfind interface route %s/%d on %d\n", 2033 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index); 2034 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 2035 struct in6_addr none; 2036 memset(&none, 0, sizeof(none)); 2037 if (rrt->rrt_index == ifcp->ifc_index && 2038 (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) || 2039 IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) { 2040 trace(1, "\troute found, age it\n"); 2041 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 2042 rrt->rrt_t = t_lifetime; 2043 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 2044 } 2045 updated++; 2046 } else { 2047 trace(1, "\tnon-interface route found: %s/%d on %d\n", 2048 inet6_n2p(&rrt->rrt_info.rip6_dest), 2049 rrt->rrt_info.rip6_plen, 2050 rrt->rrt_index); 2051 } 2052 } else 2053 trace(1, "\tno interface route found\n"); 2054 /* age route for p2p destination */ 2055 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 2056 memset(&ni6, 0, sizeof(ni6)); 2057 ni6.rip6_dest = ifa->ifa_raddr; 2058 ni6.rip6_plen = 128; 2059 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 2060 trace(1, "\tfind p2p route %s/%d on %d\n", 2061 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, 2062 ifcp->ifc_index); 2063 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 2064 if (rrt->rrt_index == ifcp->ifc_index && 2065 IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) { 2066 trace(1, "\troute found, age it\n"); 2067 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 2068 rrt->rrt_t = t_lifetime; 2069 rrt->rrt_info.rip6_metric = 2070 HOPCNT_INFINITY6; 2071 updated++; 2072 } 2073 } else { 2074 trace(1, "\tnon-p2p route found: %s/%d on %d\n", 2075 inet6_n2p(&rrt->rrt_info.rip6_dest), 2076 rrt->rrt_info.rip6_plen, 2077 rrt->rrt_index); 2078 } 2079 } else 2080 trace(1, "\tno p2p route found\n"); 2081 } 2082 return updated ? 0 : -1; 2083 } 2084 2085 /* 2086 * Get each interface address and put those interface routes to the route 2087 * list. 2088 */ 2089 int 2090 ifrt(ifcp, again) 2091 struct ifc *ifcp; 2092 int again; 2093 { 2094 struct ifac *ifa; 2095 struct riprt *rrt = NULL, *search_rrt, *prev_rrt, *loop_rrt; 2096 struct netinfo6 *np; 2097 time_t t_lifetime; 2098 int need_trigger = 0; 2099 2100 #if 0 2101 if (ifcp->ifc_flags & IFF_LOOPBACK) 2102 return 0; /* ignore loopback */ 2103 #endif 2104 2105 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 2106 ifrt_p2p(ifcp, again); 2107 return 0; 2108 } 2109 2110 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2111 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 2112 #if 0 2113 trace(1, "route: %s on %s: " 2114 "skip linklocal interface address\n", 2115 inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name); 2116 #endif 2117 continue; 2118 } 2119 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) { 2120 #if 0 2121 trace(1, "route: %s: skip unspec interface address\n", 2122 ifcp->ifc_name); 2123 #endif 2124 continue; 2125 } 2126 if (IN6_IS_ADDR_LOOPBACK(&ifa->ifa_addr)) { 2127 #if 0 2128 trace(1, "route: %s: skip loopback address\n", 2129 ifcp->ifc_name); 2130 #endif 2131 continue; 2132 } 2133 if (ifcp->ifc_flags & IFF_UP) { 2134 if ((rrt = MALLOC(struct riprt)) == NULL) 2135 fatal("malloc: struct riprt"); 2136 memset(rrt, 0, sizeof(*rrt)); 2137 rrt->rrt_same = NULL; 2138 rrt->rrt_index = ifcp->ifc_index; 2139 rrt->rrt_t = 0; /* don't age */ 2140 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2141 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2142 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2143 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 2144 if (ifa->ifa_plen == 128) 2145 rrt->rrt_flags = RTF_HOST; 2146 else 2147 rrt->rrt_flags = RTF_CLONING; 2148 rrt->rrt_rflags |= RRTF_CHANGED; 2149 applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen); 2150 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2151 rrt->rrt_gw = ifa->ifa_addr; 2152 np = &rrt->rrt_info; 2153 search_rrt = rtsearch(np, &prev_rrt); 2154 if (search_rrt != NULL) { 2155 if (search_rrt->rrt_info.rip6_metric <= 2156 rrt->rrt_info.rip6_metric) { 2157 /* Already have better route */ 2158 if (!again) { 2159 trace(1, "route: %s/%d: " 2160 "already registered (%s)\n", 2161 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2162 ifcp->ifc_name); 2163 } 2164 goto next; 2165 } 2166 2167 if (prev_rrt) 2168 prev_rrt->rrt_next = rrt->rrt_next; 2169 else 2170 riprt = rrt->rrt_next; 2171 delroute(&rrt->rrt_info, &rrt->rrt_gw); 2172 } 2173 /* Attach the route to the list */ 2174 trace(1, "route: %s/%d: register route (%s)\n", 2175 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2176 ifcp->ifc_name); 2177 rrt->rrt_next = riprt; 2178 riprt = rrt; 2179 addroute(rrt, &rrt->rrt_gw, ifcp); 2180 rrt = NULL; 2181 sendrequest(ifcp); 2182 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 2183 need_trigger = 1; 2184 } else { 2185 for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) { 2186 if (loop_rrt->rrt_index == ifcp->ifc_index) { 2187 t_lifetime = time(NULL) - RIP_LIFETIME; 2188 if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) { 2189 loop_rrt->rrt_t = t_lifetime; 2190 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 2191 loop_rrt->rrt_rflags |= RRTF_CHANGED; 2192 need_trigger = 1; 2193 } 2194 } 2195 } 2196 } 2197 next: 2198 if (rrt) 2199 free(rrt); 2200 } 2201 return need_trigger; 2202 } 2203 2204 /* 2205 * there are couple of p2p interface routing models. "behavior" lets 2206 * you pick one. it looks that gated behavior fits best with BSDs, 2207 * since BSD kernels do not look at prefix length on p2p interfaces. 2208 */ 2209 void 2210 ifrt_p2p(ifcp, again) 2211 struct ifc *ifcp; 2212 int again; 2213 { 2214 struct ifac *ifa; 2215 struct riprt *rrt, *orrt, *prevrrt; 2216 struct netinfo6 *np; 2217 struct in6_addr addr, dest; 2218 int advert, ignore, i; 2219 #define P2PADVERT_NETWORK 1 2220 #define P2PADVERT_ADDR 2 2221 #define P2PADVERT_DEST 4 2222 #define P2PADVERT_MAX 4 2223 const enum { CISCO, GATED, ROUTE6D } behavior = GATED; 2224 const char *category = ""; 2225 const char *noadv; 2226 2227 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2228 addr = ifa->ifa_addr; 2229 dest = ifa->ifa_raddr; 2230 applyplen(&addr, ifa->ifa_plen); 2231 applyplen(&dest, ifa->ifa_plen); 2232 advert = ignore = 0; 2233 switch (behavior) { 2234 case CISCO: 2235 /* 2236 * honor addr/plen, just like normal shared medium 2237 * interface. this may cause trouble if you reuse 2238 * addr/plen on other interfaces. 2239 * 2240 * advertise addr/plen. 2241 */ 2242 advert |= P2PADVERT_NETWORK; 2243 break; 2244 case GATED: 2245 /* 2246 * prefixlen on p2p interface is meaningless. 2247 * advertise addr/128 and dest/128. 2248 * 2249 * do not install network route to route6d routing 2250 * table (if we do, it would prevent route installation 2251 * for other p2p interface that shares addr/plen). 2252 * 2253 * XXX what should we do if dest is ::? it will not 2254 * get announced anyways (see following filter), 2255 * but we need to think. 2256 */ 2257 advert |= P2PADVERT_ADDR; 2258 advert |= P2PADVERT_DEST; 2259 ignore |= P2PADVERT_NETWORK; 2260 break; 2261 case ROUTE6D: 2262 /* 2263 * just for testing. actually the code is redundant 2264 * given the current p2p interface address assignment 2265 * rule for kame kernel. 2266 * 2267 * intent: 2268 * A/n -> announce A/n 2269 * A B/n, A and B share prefix -> A/n (= B/n) 2270 * A B/n, do not share prefix -> A/128 and B/128 2271 * actually, A/64 and A B/128 are the only cases 2272 * permitted by the kernel: 2273 * A/64 -> A/64 2274 * A B/128 -> A/128 and B/128 2275 */ 2276 if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) { 2277 if (IN6_ARE_ADDR_EQUAL(&addr, &dest)) 2278 advert |= P2PADVERT_NETWORK; 2279 else { 2280 advert |= P2PADVERT_ADDR; 2281 advert |= P2PADVERT_DEST; 2282 ignore |= P2PADVERT_NETWORK; 2283 } 2284 } else 2285 advert |= P2PADVERT_NETWORK; 2286 break; 2287 } 2288 2289 for (i = 1; i <= P2PADVERT_MAX; i *= 2) { 2290 if ((ignore & i) != 0) 2291 continue; 2292 if ((rrt = MALLOC(struct riprt)) == NULL) { 2293 fatal("malloc: struct riprt"); 2294 /*NOTREACHED*/ 2295 } 2296 memset(rrt, 0, sizeof(*rrt)); 2297 rrt->rrt_same = NULL; 2298 rrt->rrt_index = ifcp->ifc_index; 2299 rrt->rrt_t = 0; /* don't age */ 2300 switch (i) { 2301 case P2PADVERT_NETWORK: 2302 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2303 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 2304 applyplen(&rrt->rrt_info.rip6_dest, 2305 ifa->ifa_plen); 2306 category = "network"; 2307 break; 2308 case P2PADVERT_ADDR: 2309 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2310 rrt->rrt_info.rip6_plen = 128; 2311 rrt->rrt_gw = in6addr_loopback; 2312 category = "addr"; 2313 break; 2314 case P2PADVERT_DEST: 2315 rrt->rrt_info.rip6_dest = ifa->ifa_raddr; 2316 rrt->rrt_info.rip6_plen = 128; 2317 rrt->rrt_gw = ifa->ifa_addr; 2318 category = "dest"; 2319 break; 2320 } 2321 if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) || 2322 IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) { 2323 #if 0 2324 trace(1, "route: %s: skip unspec/linklocal " 2325 "(%s on %s)\n", category, ifcp->ifc_name); 2326 #endif 2327 free(rrt); 2328 continue; 2329 } 2330 if ((advert & i) == 0) { 2331 rrt->rrt_rflags |= RRTF_NOADVERTISE; 2332 noadv = ", NO-ADV"; 2333 } else 2334 noadv = ""; 2335 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2336 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2337 np = &rrt->rrt_info; 2338 orrt = rtsearch(np, &prevrrt); 2339 if (!orrt) { 2340 /* Attach the route to the list */ 2341 trace(1, "route: %s/%d: register route " 2342 "(%s on %s%s)\n", 2343 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2344 category, ifcp->ifc_name, noadv); 2345 rrt->rrt_next = riprt; 2346 riprt = rrt; 2347 } else if (rrt->rrt_index != orrt->rrt_index || 2348 rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) { 2349 /* swap route */ 2350 rrt->rrt_next = orrt->rrt_next; 2351 if (prevrrt) 2352 prevrrt->rrt_next = rrt; 2353 else 2354 riprt = rrt; 2355 free(orrt); 2356 2357 trace(1, "route: %s/%d: update (%s on %s%s)\n", 2358 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2359 category, ifcp->ifc_name, noadv); 2360 } else { 2361 /* Already found */ 2362 if (!again) { 2363 trace(1, "route: %s/%d: " 2364 "already registered (%s on %s%s)\n", 2365 inet6_n2p(&np->rip6_dest), 2366 np->rip6_plen, category, 2367 ifcp->ifc_name, noadv); 2368 } 2369 free(rrt); 2370 } 2371 } 2372 } 2373 #undef P2PADVERT_NETWORK 2374 #undef P2PADVERT_ADDR 2375 #undef P2PADVERT_DEST 2376 #undef P2PADVERT_MAX 2377 } 2378 2379 int 2380 getifmtu(ifindex) 2381 int ifindex; 2382 { 2383 int mib[6]; 2384 char *buf; 2385 size_t msize; 2386 struct if_msghdr *ifm; 2387 int mtu; 2388 2389 mib[0] = CTL_NET; 2390 mib[1] = PF_ROUTE; 2391 mib[2] = 0; 2392 mib[3] = AF_INET6; 2393 mib[4] = NET_RT_IFLIST; 2394 mib[5] = ifindex; 2395 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2396 fatal("sysctl estimate NET_RT_IFLIST"); 2397 /*NOTREACHED*/ 2398 } 2399 if ((buf = malloc(msize)) == NULL) { 2400 fatal("malloc"); 2401 /*NOTREACHED*/ 2402 } 2403 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2404 fatal("sysctl NET_RT_IFLIST"); 2405 /*NOTREACHED*/ 2406 } 2407 ifm = (struct if_msghdr *)buf; 2408 mtu = ifm->ifm_data.ifi_mtu; 2409 if (ifindex != ifm->ifm_index) { 2410 fatal("ifindex does not match with ifm_index"); 2411 /*NOTREACHED*/ 2412 } 2413 free(buf); 2414 return mtu; 2415 } 2416 2417 const char * 2418 rttypes(rtm) 2419 struct rt_msghdr *rtm; 2420 { 2421 #define RTTYPE(s, f) \ 2422 do { \ 2423 if (rtm->rtm_type == (f)) \ 2424 return (s); \ 2425 } while (0) 2426 RTTYPE("ADD", RTM_ADD); 2427 RTTYPE("DELETE", RTM_DELETE); 2428 RTTYPE("CHANGE", RTM_CHANGE); 2429 RTTYPE("GET", RTM_GET); 2430 RTTYPE("LOSING", RTM_LOSING); 2431 RTTYPE("REDIRECT", RTM_REDIRECT); 2432 RTTYPE("MISS", RTM_MISS); 2433 RTTYPE("LOCK", RTM_LOCK); 2434 RTTYPE("OLDADD", RTM_OLDADD); 2435 RTTYPE("OLDDEL", RTM_OLDDEL); 2436 RTTYPE("RESOLVE", RTM_RESOLVE); 2437 RTTYPE("NEWADDR", RTM_NEWADDR); 2438 RTTYPE("DELADDR", RTM_DELADDR); 2439 RTTYPE("IFINFO", RTM_IFINFO); 2440 #ifdef RTM_OLDADD 2441 RTTYPE("OLDADD", RTM_OLDADD); 2442 #endif 2443 #ifdef RTM_OLDDEL 2444 RTTYPE("OLDDEL", RTM_OLDDEL); 2445 #endif 2446 #ifdef RTM_OIFINFO 2447 RTTYPE("OIFINFO", RTM_OIFINFO); 2448 #endif 2449 #ifdef RTM_IFANNOUNCE 2450 RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE); 2451 #endif 2452 #ifdef RTM_NEWMADDR 2453 RTTYPE("NEWMADDR", RTM_NEWMADDR); 2454 #endif 2455 #ifdef RTM_DELMADDR 2456 RTTYPE("DELMADDR", RTM_DELMADDR); 2457 #endif 2458 #undef RTTYPE 2459 return NULL; 2460 } 2461 2462 const char * 2463 rtflags(rtm) 2464 struct rt_msghdr *rtm; 2465 { 2466 static char buf[BUFSIZ]; 2467 2468 /* 2469 * letter conflict should be okay. painful when *BSD diverges... 2470 */ 2471 strlcpy(buf, "", sizeof(buf)); 2472 #define RTFLAG(s, f) \ 2473 do { \ 2474 if (rtm->rtm_flags & (f)) \ 2475 strlcat(buf, (s), sizeof(buf)); \ 2476 } while (0) 2477 RTFLAG("U", RTF_UP); 2478 RTFLAG("G", RTF_GATEWAY); 2479 RTFLAG("H", RTF_HOST); 2480 RTFLAG("R", RTF_REJECT); 2481 RTFLAG("D", RTF_DYNAMIC); 2482 RTFLAG("M", RTF_MODIFIED); 2483 RTFLAG("d", RTF_DONE); 2484 #ifdef RTF_MASK 2485 RTFLAG("m", RTF_MASK); 2486 #endif 2487 RTFLAG("C", RTF_CLONING); 2488 #ifdef RTF_CLONED 2489 RTFLAG("c", RTF_CLONED); 2490 #endif 2491 #ifdef RTF_PRCLONING 2492 RTFLAG("c", RTF_PRCLONING); 2493 #endif 2494 #ifdef RTF_WASCLONED 2495 RTFLAG("W", RTF_WASCLONED); 2496 #endif 2497 RTFLAG("X", RTF_XRESOLVE); 2498 RTFLAG("L", RTF_LLINFO); 2499 RTFLAG("S", RTF_STATIC); 2500 RTFLAG("B", RTF_BLACKHOLE); 2501 #ifdef RTF_PROTO3 2502 RTFLAG("3", RTF_PROTO3); 2503 #endif 2504 RTFLAG("2", RTF_PROTO2); 2505 RTFLAG("1", RTF_PROTO1); 2506 #ifdef RTF_BROADCAST 2507 RTFLAG("b", RTF_BROADCAST); 2508 #endif 2509 #ifdef RTF_DEFAULT 2510 RTFLAG("d", RTF_DEFAULT); 2511 #endif 2512 #ifdef RTF_ISAROUTER 2513 RTFLAG("r", RTF_ISAROUTER); 2514 #endif 2515 #ifdef RTF_TUNNEL 2516 RTFLAG("T", RTF_TUNNEL); 2517 #endif 2518 #ifdef RTF_AUTH 2519 RTFLAG("A", RTF_AUTH); 2520 #endif 2521 #ifdef RTF_CRYPT 2522 RTFLAG("E", RTF_CRYPT); 2523 #endif 2524 #undef RTFLAG 2525 return buf; 2526 } 2527 2528 const char * 2529 ifflags(flags) 2530 int flags; 2531 { 2532 static char buf[BUFSIZ]; 2533 2534 strlcpy(buf, "", sizeof(buf)); 2535 #define IFFLAG(s, f) \ 2536 do { \ 2537 if (flags & (f)) { \ 2538 if (buf[0]) \ 2539 strlcat(buf, ",", sizeof(buf)); \ 2540 strlcat(buf, (s), sizeof(buf)); \ 2541 } \ 2542 } while (0) 2543 IFFLAG("UP", IFF_UP); 2544 IFFLAG("BROADCAST", IFF_BROADCAST); 2545 IFFLAG("DEBUG", IFF_DEBUG); 2546 IFFLAG("LOOPBACK", IFF_LOOPBACK); 2547 IFFLAG("POINTOPOINT", IFF_POINTOPOINT); 2548 #ifdef IFF_NOTRAILERS 2549 IFFLAG("NOTRAILERS", IFF_NOTRAILERS); 2550 #endif 2551 #ifdef IFF_SMART 2552 IFFLAG("SMART", IFF_SMART); 2553 #endif 2554 IFFLAG("RUNNING", IFF_RUNNING); 2555 IFFLAG("NOARP", IFF_NOARP); 2556 IFFLAG("PROMISC", IFF_PROMISC); 2557 IFFLAG("ALLMULTI", IFF_ALLMULTI); 2558 IFFLAG("OACTIVE", IFF_OACTIVE); 2559 IFFLAG("SIMPLEX", IFF_SIMPLEX); 2560 IFFLAG("LINK0", IFF_LINK0); 2561 IFFLAG("LINK1", IFF_LINK1); 2562 IFFLAG("LINK2", IFF_LINK2); 2563 IFFLAG("MULTICAST", IFF_MULTICAST); 2564 #undef IFFLAG 2565 return buf; 2566 } 2567 2568 void 2569 krtread(again) 2570 int again; 2571 { 2572 int mib[6]; 2573 size_t msize; 2574 char *buf, *p, *lim; 2575 struct rt_msghdr *rtm; 2576 int retry; 2577 const char *errmsg; 2578 2579 retry = 0; 2580 buf = NULL; 2581 mib[0] = CTL_NET; 2582 mib[1] = PF_ROUTE; 2583 mib[2] = 0; 2584 mib[3] = AF_INET6; /* Address family */ 2585 mib[4] = NET_RT_DUMP; /* Dump the kernel routing table */ 2586 mib[5] = 0; /* No flags */ 2587 do { 2588 retry++; 2589 errmsg = NULL; 2590 if (buf) 2591 free(buf); 2592 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2593 errmsg = "sysctl estimate"; 2594 continue; 2595 } 2596 if ((buf = malloc(msize)) == NULL) { 2597 errmsg = "malloc"; 2598 continue; 2599 } 2600 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2601 errmsg = "sysctl NET_RT_DUMP"; 2602 continue; 2603 } 2604 } while (retry < 5 && errmsg != NULL); 2605 if (errmsg) { 2606 fatal("%s (with %d retries, msize=%lu)", errmsg, retry, 2607 (u_long)msize); 2608 /*NOTREACHED*/ 2609 } else if (1 < retry) 2610 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry); 2611 2612 lim = buf + msize; 2613 for (p = buf; p < lim; p += rtm->rtm_msglen) { 2614 rtm = (struct rt_msghdr *)p; 2615 rt_entry(rtm, again); 2616 } 2617 free(buf); 2618 } 2619 2620 void 2621 rt_entry(rtm, again) 2622 struct rt_msghdr *rtm; 2623 int again; 2624 { 2625 struct sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask; 2626 struct sockaddr_in6 *sin6_genmask, *sin6_ifp; 2627 char *rtmp, *ifname = NULL; 2628 struct riprt *rrt, *orrt; 2629 struct netinfo6 *np; 2630 int s; 2631 2632 sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0; 2633 if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags & 2634 (RTF_CLONING|RTF_XRESOLVE|RTF_LLINFO|RTF_BLACKHOLE)) { 2635 return; /* not interested in the link route */ 2636 } 2637 /* do not look at cloned routes */ 2638 #ifdef RTF_WASCLONED 2639 if (rtm->rtm_flags & RTF_WASCLONED) 2640 return; 2641 #endif 2642 #ifdef RTF_CLONED 2643 if (rtm->rtm_flags & RTF_CLONED) 2644 return; 2645 #endif 2646 /* 2647 * do not look at dynamic routes. 2648 * netbsd/openbsd cloned routes have UGHD. 2649 */ 2650 if (rtm->rtm_flags & RTF_DYNAMIC) 2651 return; 2652 rtmp = (char *)(rtm + 1); 2653 /* Destination */ 2654 if ((rtm->rtm_addrs & RTA_DST) == 0) 2655 return; /* ignore routes without destination address */ 2656 sin6_dst = (struct sockaddr_in6 *)rtmp; 2657 rtmp += ROUNDUP(sin6_dst->sin6_len); 2658 if (rtm->rtm_addrs & RTA_GATEWAY) { 2659 sin6_gw = (struct sockaddr_in6 *)rtmp; 2660 rtmp += ROUNDUP(sin6_gw->sin6_len); 2661 } 2662 if (rtm->rtm_addrs & RTA_NETMASK) { 2663 sin6_mask = (struct sockaddr_in6 *)rtmp; 2664 rtmp += ROUNDUP(sin6_mask->sin6_len); 2665 } 2666 if (rtm->rtm_addrs & RTA_GENMASK) { 2667 sin6_genmask = (struct sockaddr_in6 *)rtmp; 2668 rtmp += ROUNDUP(sin6_genmask->sin6_len); 2669 } 2670 if (rtm->rtm_addrs & RTA_IFP) { 2671 sin6_ifp = (struct sockaddr_in6 *)rtmp; 2672 rtmp += ROUNDUP(sin6_ifp->sin6_len); 2673 } 2674 2675 /* Destination */ 2676 if (sin6_dst->sin6_family != AF_INET6) 2677 return; 2678 if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr)) 2679 return; /* Link-local */ 2680 if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback)) 2681 return; /* Loopback */ 2682 if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr)) 2683 return; 2684 2685 if ((rrt = MALLOC(struct riprt)) == NULL) { 2686 fatal("malloc: struct riprt"); 2687 /*NOTREACHED*/ 2688 } 2689 memset(rrt, 0, sizeof(*rrt)); 2690 np = &rrt->rrt_info; 2691 rrt->rrt_same = NULL; 2692 rrt->rrt_t = time(NULL); 2693 if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC)) 2694 rrt->rrt_t = 0; /* Don't age static routes */ 2695 if ((rtm->rtm_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST) 2696 rrt->rrt_t = 0; /* Don't age non-gateway host routes */ 2697 np->rip6_tag = 0; 2698 np->rip6_metric = rtm->rtm_rmx.rmx_hopcount; 2699 if (np->rip6_metric < 1) 2700 np->rip6_metric = 1; 2701 rrt->rrt_flags = rtm->rtm_flags; 2702 np->rip6_dest = sin6_dst->sin6_addr; 2703 2704 /* Mask or plen */ 2705 if (rtm->rtm_flags & RTF_HOST) 2706 np->rip6_plen = 128; /* Host route */ 2707 else if (sin6_mask) 2708 np->rip6_plen = sin6mask2len(sin6_mask); 2709 else 2710 np->rip6_plen = 0; 2711 2712 orrt = rtsearch(np, NULL); 2713 if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) { 2714 /* Already found */ 2715 if (!again) { 2716 trace(1, "route: %s/%d flags %s: already registered\n", 2717 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2718 rtflags(rtm)); 2719 } 2720 free(rrt); 2721 return; 2722 } 2723 /* Gateway */ 2724 if (!sin6_gw) 2725 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2726 else { 2727 if (sin6_gw->sin6_family == AF_INET6) 2728 rrt->rrt_gw = sin6_gw->sin6_addr; 2729 else if (sin6_gw->sin6_family == AF_LINK) { 2730 /* XXX in case ppp link? */ 2731 rrt->rrt_gw = in6addr_loopback; 2732 } else 2733 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2734 } 2735 trace(1, "route: %s/%d flags %s", 2736 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm)); 2737 trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw)); 2738 2739 /* Interface */ 2740 s = rtm->rtm_index; 2741 if (s < nindex2ifc && index2ifc[s]) 2742 ifname = index2ifc[s]->ifc_name; 2743 else { 2744 trace(1, " not configured\n"); 2745 free(rrt); 2746 return; 2747 } 2748 trace(1, " if %s sock %d", ifname, s); 2749 rrt->rrt_index = s; 2750 2751 trace(1, "\n"); 2752 2753 /* Check gateway */ 2754 if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) && 2755 !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw) && 2756 (rrt->rrt_flags & RTF_LOCAL) == 0) { 2757 trace(0, "***** Gateway %s is not a link-local address.\n", 2758 inet6_n2p(&rrt->rrt_gw)); 2759 trace(0, "***** dest(%s) if(%s) -- Not optimized.\n", 2760 inet6_n2p(&rrt->rrt_info.rip6_dest), ifname); 2761 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR; 2762 } 2763 2764 /* Put it to the route list */ 2765 if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) { 2766 /* replace route list */ 2767 rrt->rrt_next = orrt->rrt_next; 2768 *orrt = *rrt; 2769 trace(1, "route: %s/%d flags %s: replace new route\n", 2770 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2771 rtflags(rtm)); 2772 free(rrt); 2773 } else { 2774 rrt->rrt_next = riprt; 2775 riprt = rrt; 2776 } 2777 } 2778 2779 int 2780 addroute(rrt, gw, ifcp) 2781 struct riprt *rrt; 2782 const struct in6_addr *gw; 2783 struct ifc *ifcp; 2784 { 2785 struct netinfo6 *np; 2786 u_char buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ]; 2787 struct rt_msghdr *rtm; 2788 struct sockaddr_in6 *sin6; 2789 int len; 2790 2791 np = &rrt->rrt_info; 2792 inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1)); 2793 inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2)); 2794 tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n", 2795 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2796 np->rip6_metric - 1, buf2); 2797 if (rtlog) 2798 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(), 2799 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2800 np->rip6_metric - 1, buf2); 2801 if (nflag) 2802 return 0; 2803 2804 memset(buf, 0, sizeof(buf)); 2805 rtm = (struct rt_msghdr *)buf; 2806 rtm->rtm_type = RTM_ADD; 2807 rtm->rtm_version = RTM_VERSION; 2808 rtm->rtm_seq = ++seq; 2809 rtm->rtm_pid = pid; 2810 rtm->rtm_flags = rrt->rrt_flags; 2811 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2812 rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1; 2813 rtm->rtm_inits = RTV_HOPCOUNT; 2814 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2815 /* Destination */ 2816 sin6->sin6_len = sizeof(struct sockaddr_in6); 2817 sin6->sin6_family = AF_INET6; 2818 sin6->sin6_addr = np->rip6_dest; 2819 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2820 /* Gateway */ 2821 sin6->sin6_len = sizeof(struct sockaddr_in6); 2822 sin6->sin6_family = AF_INET6; 2823 sin6->sin6_addr = *gw; 2824 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2825 /* Netmask */ 2826 sin6->sin6_len = sizeof(struct sockaddr_in6); 2827 sin6->sin6_family = AF_INET6; 2828 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2829 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2830 2831 len = (char *)sin6 - (char *)buf; 2832 rtm->rtm_msglen = len; 2833 if (write(rtsock, buf, len) > 0) 2834 return 0; 2835 2836 if (errno == EEXIST) { 2837 trace(0, "ADD: Route already exists %s/%d gw %s\n", 2838 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2839 if (rtlog) 2840 fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n", 2841 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2842 } else { 2843 trace(0, "Can not write to rtsock (addroute): %s\n", 2844 strerror(errno)); 2845 if (rtlog) 2846 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2847 strerror(errno)); 2848 } 2849 return -1; 2850 } 2851 2852 int 2853 delroute(np, gw) 2854 struct netinfo6 *np; 2855 struct in6_addr *gw; 2856 { 2857 u_char buf[BUFSIZ], buf2[BUFSIZ]; 2858 struct rt_msghdr *rtm; 2859 struct sockaddr_in6 *sin6; 2860 int len; 2861 2862 inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2)); 2863 tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest), 2864 np->rip6_plen, buf2); 2865 if (rtlog) 2866 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n", 2867 hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2868 if (nflag) 2869 return 0; 2870 2871 memset(buf, 0, sizeof(buf)); 2872 rtm = (struct rt_msghdr *)buf; 2873 rtm->rtm_type = RTM_DELETE; 2874 rtm->rtm_version = RTM_VERSION; 2875 rtm->rtm_seq = ++seq; 2876 rtm->rtm_pid = pid; 2877 rtm->rtm_flags = RTF_UP | RTF_GATEWAY; 2878 if (np->rip6_plen == sizeof(struct in6_addr) * 8) 2879 rtm->rtm_flags |= RTF_HOST; 2880 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2881 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2882 /* Destination */ 2883 sin6->sin6_len = sizeof(struct sockaddr_in6); 2884 sin6->sin6_family = AF_INET6; 2885 sin6->sin6_addr = np->rip6_dest; 2886 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2887 /* Gateway */ 2888 sin6->sin6_len = sizeof(struct sockaddr_in6); 2889 sin6->sin6_family = AF_INET6; 2890 sin6->sin6_addr = *gw; 2891 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2892 /* Netmask */ 2893 sin6->sin6_len = sizeof(struct sockaddr_in6); 2894 sin6->sin6_family = AF_INET6; 2895 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2896 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2897 2898 len = (char *)sin6 - (char *)buf; 2899 rtm->rtm_msglen = len; 2900 if (write(rtsock, buf, len) >= 0) 2901 return 0; 2902 2903 if (errno == ESRCH) { 2904 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n", 2905 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2906 if (rtlog) 2907 fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n", 2908 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2909 } else { 2910 trace(0, "Can not write to rtsock (delroute): %s\n", 2911 strerror(errno)); 2912 if (rtlog) 2913 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2914 strerror(errno)); 2915 } 2916 return -1; 2917 } 2918 2919 struct in6_addr * 2920 getroute(np, gw) 2921 struct netinfo6 *np; 2922 struct in6_addr *gw; 2923 { 2924 u_char buf[BUFSIZ]; 2925 int myseq; 2926 int len; 2927 struct rt_msghdr *rtm; 2928 struct sockaddr_in6 *sin6; 2929 2930 rtm = (struct rt_msghdr *)buf; 2931 len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6); 2932 memset(rtm, 0, len); 2933 rtm->rtm_type = RTM_GET; 2934 rtm->rtm_version = RTM_VERSION; 2935 myseq = ++seq; 2936 rtm->rtm_seq = myseq; 2937 rtm->rtm_addrs = RTA_DST; 2938 rtm->rtm_msglen = len; 2939 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2940 sin6->sin6_len = sizeof(struct sockaddr_in6); 2941 sin6->sin6_family = AF_INET6; 2942 sin6->sin6_addr = np->rip6_dest; 2943 if (write(rtsock, buf, len) < 0) { 2944 if (errno == ESRCH) /* No such route found */ 2945 return NULL; 2946 perror("write to rtsock"); 2947 exit(1); 2948 } 2949 do { 2950 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 2951 perror("read from rtsock"); 2952 exit(1); 2953 } 2954 rtm = (struct rt_msghdr *)buf; 2955 } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid); 2956 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2957 if (rtm->rtm_addrs & RTA_DST) { 2958 sin6 = (struct sockaddr_in6 *) 2959 ((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2960 } 2961 if (rtm->rtm_addrs & RTA_GATEWAY) { 2962 *gw = sin6->sin6_addr; 2963 return gw; 2964 } 2965 return NULL; 2966 } 2967 2968 const char * 2969 inet6_n2p(p) 2970 const struct in6_addr *p; 2971 { 2972 static char buf[BUFSIZ]; 2973 2974 return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf)); 2975 } 2976 2977 void 2978 ifrtdump(sig) 2979 int sig; 2980 { 2981 2982 ifdump(sig); 2983 rtdump(sig); 2984 } 2985 2986 void 2987 ifdump(sig) 2988 int sig; 2989 { 2990 struct ifc *ifcp; 2991 FILE *dump; 2992 int i; 2993 2994 if (sig == 0) 2995 dump = stderr; 2996 else 2997 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 2998 dump = stderr; 2999 3000 fprintf(dump, "%s: Interface Table Dump\n", hms()); 3001 fprintf(dump, " Number of interfaces: %d\n", nifc); 3002 for (i = 0; i < 2; i++) { 3003 fprintf(dump, " %sadvertising interfaces:\n", i ? "non-" : ""); 3004 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 3005 if (i == 0) { 3006 if ((ifcp->ifc_flags & IFF_UP) == 0) 3007 continue; 3008 if (iff_find(ifcp, 'N') != NULL) 3009 continue; 3010 } else { 3011 if (ifcp->ifc_flags & IFF_UP) 3012 continue; 3013 } 3014 ifdump0(dump, ifcp); 3015 } 3016 } 3017 fprintf(dump, "\n"); 3018 if (dump != stderr) 3019 fclose(dump); 3020 } 3021 3022 void 3023 ifdump0(dump, ifcp) 3024 FILE *dump; 3025 const struct ifc *ifcp; 3026 { 3027 struct ifac *ifa; 3028 struct iff *iffp; 3029 char buf[BUFSIZ]; 3030 const char *ft; 3031 int addr; 3032 3033 fprintf(dump, " %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n", 3034 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags), 3035 inet6_n2p(&ifcp->ifc_mylladdr), 3036 ifcp->ifc_mtu, ifcp->ifc_metric); 3037 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 3038 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 3039 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, 3040 buf, sizeof(buf)); 3041 fprintf(dump, "\t%s/%d -- %s\n", 3042 inet6_n2p(&ifa->ifa_addr), 3043 ifa->ifa_plen, buf); 3044 } else { 3045 fprintf(dump, "\t%s/%d\n", 3046 inet6_n2p(&ifa->ifa_addr), 3047 ifa->ifa_plen); 3048 } 3049 } 3050 if (ifcp->ifc_filter) { 3051 fprintf(dump, "\tFilter:"); 3052 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 3053 addr = 0; 3054 switch (iffp->iff_type) { 3055 case 'A': 3056 ft = "Aggregate"; addr++; break; 3057 case 'N': 3058 ft = "No-use"; break; 3059 case 'O': 3060 ft = "Advertise-only"; addr++; break; 3061 case 'T': 3062 ft = "Default-only"; break; 3063 case 'L': 3064 ft = "Listen-only"; addr++; break; 3065 default: 3066 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type); 3067 ft = buf; 3068 addr++; 3069 break; 3070 } 3071 fprintf(dump, " %s", ft); 3072 if (addr) { 3073 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr), 3074 iffp->iff_plen); 3075 } 3076 } 3077 fprintf(dump, "\n"); 3078 } 3079 } 3080 3081 void 3082 rtdump(sig) 3083 int sig; 3084 { 3085 struct riprt *rrt; 3086 char buf[BUFSIZ]; 3087 FILE *dump; 3088 time_t t, age; 3089 3090 if (sig == 0) 3091 dump = stderr; 3092 else 3093 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 3094 dump = stderr; 3095 3096 t = time(NULL); 3097 fprintf(dump, "\n%s: Routing Table Dump\n", hms()); 3098 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 3099 if (rrt->rrt_t == 0) 3100 age = 0; 3101 else 3102 age = t - rrt->rrt_t; 3103 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest, 3104 buf, sizeof(buf)); 3105 fprintf(dump, " %s/%d if(%d:%s) gw(%s) [%d] age(%ld)", 3106 buf, rrt->rrt_info.rip6_plen, rrt->rrt_index, 3107 index2ifc[rrt->rrt_index]->ifc_name, 3108 inet6_n2p(&rrt->rrt_gw), 3109 rrt->rrt_info.rip6_metric, (long)age); 3110 if (rrt->rrt_info.rip6_tag) { 3111 fprintf(dump, " tag(0x%04x)", 3112 ntohs(rrt->rrt_info.rip6_tag) & 0xffff); 3113 } 3114 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) 3115 fprintf(dump, " NOT-LL"); 3116 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 3117 fprintf(dump, " NO-ADV"); 3118 fprintf(dump, "\n"); 3119 } 3120 fprintf(dump, "\n"); 3121 if (dump != stderr) 3122 fclose(dump); 3123 } 3124 3125 /* 3126 * Parse the -A (and -O) options and put corresponding filter object to the 3127 * specified interface structures. Each of the -A/O option has the following 3128 * syntax: -A 5f09:c400::/32,ef0,ef1 (aggregate) 3129 * -O 5f09:c400::/32,ef0,ef1 (only when match) 3130 */ 3131 void 3132 filterconfig() 3133 { 3134 int i; 3135 char *p, *ap, *iflp, *ifname, *ep; 3136 struct iff ftmp, *iff_obj; 3137 struct ifc *ifcp; 3138 struct riprt *rrt; 3139 #if 0 3140 struct in6_addr gw; 3141 #endif 3142 u_long plen; 3143 3144 for (i = 0; i < nfilter; i++) { 3145 ap = filter[i]; 3146 iflp = NULL; 3147 ifcp = NULL; 3148 if (filtertype[i] == 'N' || filtertype[i] == 'T') { 3149 iflp = ap; 3150 goto ifonly; 3151 } 3152 if ((p = strchr(ap, ',')) != NULL) { 3153 *p++ = '\0'; 3154 iflp = p; 3155 } 3156 if ((p = strchr(ap, '/')) == NULL) { 3157 fatal("no prefixlen specified for '%s'", ap); 3158 /*NOTREACHED*/ 3159 } 3160 *p++ = '\0'; 3161 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) { 3162 fatal("invalid prefix specified for '%s'", ap); 3163 /*NOTREACHED*/ 3164 } 3165 errno = 0; 3166 ep = NULL; 3167 plen = strtoul(p, &ep, 10); 3168 if (errno || !*p || *ep || plen > sizeof(ftmp.iff_addr) * 8) { 3169 fatal("invalid prefix length specified for '%s'", ap); 3170 /*NOTREACHED*/ 3171 } 3172 ftmp.iff_plen = plen; 3173 ftmp.iff_next = NULL; 3174 applyplen(&ftmp.iff_addr, ftmp.iff_plen); 3175 ifonly: 3176 ftmp.iff_type = filtertype[i]; 3177 if (iflp == NULL || *iflp == '\0') { 3178 fatal("no interface specified for '%s'", ap); 3179 /*NOTREACHED*/ 3180 } 3181 /* parse the interface listing portion */ 3182 while (iflp) { 3183 ifname = iflp; 3184 if ((iflp = strchr(iflp, ',')) != NULL) 3185 *iflp++ = '\0'; 3186 ifcp = ifc_find(ifname); 3187 if (ifcp == NULL) { 3188 fatal("no interface %s exists", ifname); 3189 /*NOTREACHED*/ 3190 } 3191 iff_obj = (struct iff *)malloc(sizeof(struct iff)); 3192 if (iff_obj == NULL) { 3193 fatal("malloc of iff_obj"); 3194 /*NOTREACHED*/ 3195 } 3196 memcpy((void *)iff_obj, (void *)&ftmp, 3197 sizeof(struct iff)); 3198 /* link it to the interface filter */ 3199 iff_obj->iff_next = ifcp->ifc_filter; 3200 ifcp->ifc_filter = iff_obj; 3201 } 3202 3203 /* 3204 * -A: aggregate configuration. 3205 */ 3206 if (filtertype[i] != 'A') 3207 continue; 3208 /* put the aggregate to the kernel routing table */ 3209 rrt = (struct riprt *)malloc(sizeof(struct riprt)); 3210 if (rrt == NULL) { 3211 fatal("malloc: rrt"); 3212 /*NOTREACHED*/ 3213 } 3214 memset(rrt, 0, sizeof(struct riprt)); 3215 rrt->rrt_info.rip6_dest = ftmp.iff_addr; 3216 rrt->rrt_info.rip6_plen = ftmp.iff_plen; 3217 rrt->rrt_info.rip6_metric = 1; 3218 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 3219 rrt->rrt_gw = in6addr_loopback; 3220 rrt->rrt_flags = RTF_UP | RTF_REJECT; 3221 rrt->rrt_rflags = RRTF_AGGREGATE; 3222 rrt->rrt_t = 0; 3223 rrt->rrt_index = loopifcp->ifc_index; 3224 #if 0 3225 if (getroute(&rrt->rrt_info, &gw)) { 3226 #if 0 3227 /* 3228 * When the address has already been registered in the 3229 * kernel routing table, it should be removed 3230 */ 3231 delroute(&rrt->rrt_info, &gw); 3232 #else 3233 /* it is safer behavior */ 3234 errno = EINVAL; 3235 fatal("%s/%u already in routing table, " 3236 "cannot aggregate", 3237 inet6_n2p(&rrt->rrt_info.rip6_dest), 3238 rrt->rrt_info.rip6_plen); 3239 /*NOTREACHED*/ 3240 #endif 3241 } 3242 #endif 3243 /* Put the route to the list */ 3244 rrt->rrt_next = riprt; 3245 riprt = rrt; 3246 trace(1, "Aggregate: %s/%d for %s\n", 3247 inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen, 3248 ifcp->ifc_name); 3249 /* Add this route to the kernel */ 3250 if (nflag) /* do not modify kernel routing table */ 3251 continue; 3252 addroute(rrt, &in6addr_loopback, loopifcp); 3253 } 3254 } 3255 3256 /***************** utility functions *****************/ 3257 3258 /* 3259 * Returns a pointer to ifac whose address and prefix length matches 3260 * with the address and prefix length specified in the arguments. 3261 */ 3262 struct ifac * 3263 ifa_match(ifcp, ia, plen) 3264 const struct ifc *ifcp; 3265 const struct in6_addr *ia; 3266 int plen; 3267 { 3268 struct ifac *ifa; 3269 3270 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 3271 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) && 3272 ifa->ifa_plen == plen) 3273 break; 3274 } 3275 return ifa; 3276 } 3277 3278 /* 3279 * Return a pointer to riprt structure whose address and prefix length 3280 * matches with the address and prefix length found in the argument. 3281 * Note: This is not a rtalloc(). Therefore exact match is necessary. 3282 */ 3283 struct riprt * 3284 rtsearch(np, prev_rrt) 3285 struct netinfo6 *np; 3286 struct riprt **prev_rrt; 3287 { 3288 struct riprt *rrt; 3289 3290 if (prev_rrt) 3291 *prev_rrt = NULL; 3292 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 3293 if (rrt->rrt_info.rip6_plen == np->rip6_plen && 3294 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 3295 &np->rip6_dest)) 3296 return rrt; 3297 if (prev_rrt) 3298 *prev_rrt = rrt; 3299 } 3300 if (prev_rrt) 3301 *prev_rrt = NULL; 3302 return 0; 3303 } 3304 3305 int 3306 sin6mask2len(sin6) 3307 const struct sockaddr_in6 *sin6; 3308 { 3309 3310 return mask2len(&sin6->sin6_addr, 3311 sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr)); 3312 } 3313 3314 int 3315 mask2len(addr, lenlim) 3316 const struct in6_addr *addr; 3317 int lenlim; 3318 { 3319 int i = 0, j; 3320 const u_char *p = (const u_char *)addr; 3321 3322 for (j = 0; j < lenlim; j++, p++) { 3323 if (*p != 0xff) 3324 break; 3325 i += 8; 3326 } 3327 if (j < lenlim) { 3328 switch (*p) { 3329 #define MASKLEN(m, l) case m: do { i += l; break; } while (0) 3330 MASKLEN(0xfe, 7); break; 3331 MASKLEN(0xfc, 6); break; 3332 MASKLEN(0xf8, 5); break; 3333 MASKLEN(0xf0, 4); break; 3334 MASKLEN(0xe0, 3); break; 3335 MASKLEN(0xc0, 2); break; 3336 MASKLEN(0x80, 1); break; 3337 #undef MASKLEN 3338 } 3339 } 3340 return i; 3341 } 3342 3343 void 3344 applymask(addr, mask) 3345 struct in6_addr *addr, *mask; 3346 { 3347 int i; 3348 u_long *p, *q; 3349 3350 p = (u_long *)addr; q = (u_long *)mask; 3351 for (i = 0; i < 4; i++) 3352 *p++ &= *q++; 3353 } 3354 3355 static const u_char plent[8] = { 3356 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe 3357 }; 3358 3359 void 3360 applyplen(ia, plen) 3361 struct in6_addr *ia; 3362 int plen; 3363 { 3364 u_char *p; 3365 int i; 3366 3367 p = ia->s6_addr; 3368 for (i = 0; i < 16; i++) { 3369 if (plen <= 0) 3370 *p = 0; 3371 else if (plen < 8) 3372 *p &= plent[plen]; 3373 p++, plen -= 8; 3374 } 3375 } 3376 3377 static const int pl2m[9] = { 3378 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff 3379 }; 3380 3381 struct in6_addr * 3382 plen2mask(n) 3383 int n; 3384 { 3385 static struct in6_addr ia; 3386 u_char *p; 3387 int i; 3388 3389 memset(&ia, 0, sizeof(struct in6_addr)); 3390 p = (u_char *)&ia; 3391 for (i = 0; i < 16; i++, p++, n -= 8) { 3392 if (n >= 8) { 3393 *p = 0xff; 3394 continue; 3395 } 3396 *p = pl2m[n]; 3397 break; 3398 } 3399 return &ia; 3400 } 3401 3402 char * 3403 allocopy(p) 3404 char *p; 3405 { 3406 int len = strlen(p) + 1; 3407 char *q = (char *)malloc(len); 3408 3409 if (!q) { 3410 fatal("malloc"); 3411 /*NOTREACHED*/ 3412 } 3413 3414 strlcpy(q, p, len); 3415 return q; 3416 } 3417 3418 char * 3419 hms() 3420 { 3421 static char buf[BUFSIZ]; 3422 time_t t; 3423 struct tm *tm; 3424 3425 t = time(NULL); 3426 if ((tm = localtime(&t)) == 0) { 3427 fatal("localtime"); 3428 /*NOTREACHED*/ 3429 } 3430 snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min, 3431 tm->tm_sec); 3432 return buf; 3433 } 3434 3435 #define RIPRANDDEV 1.0 /* 30 +- 15, max - min = 30 */ 3436 3437 int 3438 ripinterval(timer) 3439 int timer; 3440 { 3441 double r = rand(); 3442 3443 interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5)); 3444 nextalarm = time(NULL) + interval; 3445 return interval; 3446 } 3447 3448 time_t 3449 ripsuptrig() 3450 { 3451 time_t t; 3452 3453 double r = rand(); 3454 t = (int)(RIP_TRIG_INT6_MIN + 3455 (RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX)); 3456 sup_trig_update = time(NULL) + t; 3457 return t; 3458 } 3459 3460 void 3461 #ifdef __STDC__ 3462 fatal(const char *fmt, ...) 3463 #else 3464 fatal(fmt, va_alist) 3465 char *fmt; 3466 va_dcl 3467 #endif 3468 { 3469 va_list ap; 3470 char buf[1024]; 3471 3472 #ifdef __STDC__ 3473 va_start(ap, fmt); 3474 #else 3475 va_start(ap); 3476 #endif 3477 vsnprintf(buf, sizeof(buf), fmt, ap); 3478 va_end(ap); 3479 perror(buf); 3480 if (errno) 3481 syslog(LOG_ERR, "%s: %s", buf, strerror(errno)); 3482 else 3483 syslog(LOG_ERR, "%s", buf); 3484 rtdexit(); 3485 } 3486 3487 void 3488 #ifdef __STDC__ 3489 tracet(int level, const char *fmt, ...) 3490 #else 3491 tracet(level, fmt, va_alist) 3492 int level; 3493 char *fmt; 3494 va_dcl 3495 #endif 3496 { 3497 va_list ap; 3498 3499 if (level <= dflag) { 3500 #ifdef __STDC__ 3501 va_start(ap, fmt); 3502 #else 3503 va_start(ap); 3504 #endif 3505 fprintf(stderr, "%s: ", hms()); 3506 vfprintf(stderr, fmt, ap); 3507 va_end(ap); 3508 } 3509 if (dflag) { 3510 #ifdef __STDC__ 3511 va_start(ap, fmt); 3512 #else 3513 va_start(ap); 3514 #endif 3515 if (level > 0) 3516 vsyslog(LOG_DEBUG, fmt, ap); 3517 else 3518 vsyslog(LOG_WARNING, fmt, ap); 3519 va_end(ap); 3520 } 3521 } 3522 3523 void 3524 #ifdef __STDC__ 3525 trace(int level, const char *fmt, ...) 3526 #else 3527 trace(level, fmt, va_alist) 3528 int level; 3529 char *fmt; 3530 va_dcl 3531 #endif 3532 { 3533 va_list ap; 3534 3535 if (level <= dflag) { 3536 #ifdef __STDC__ 3537 va_start(ap, fmt); 3538 #else 3539 va_start(ap); 3540 #endif 3541 vfprintf(stderr, fmt, ap); 3542 va_end(ap); 3543 } 3544 if (dflag) { 3545 #ifdef __STDC__ 3546 va_start(ap, fmt); 3547 #else 3548 va_start(ap); 3549 #endif 3550 if (level > 0) 3551 vsyslog(LOG_DEBUG, fmt, ap); 3552 else 3553 vsyslog(LOG_WARNING, fmt, ap); 3554 va_end(ap); 3555 } 3556 } 3557 3558 unsigned int 3559 if_maxindex() 3560 { 3561 struct if_nameindex *p, *p0; 3562 unsigned int max = 0; 3563 3564 p0 = if_nameindex(); 3565 for (p = p0; p && p->if_index && p->if_name; p++) { 3566 if (max < p->if_index) 3567 max = p->if_index; 3568 } 3569 if_freenameindex(p0); 3570 return max; 3571 } 3572 3573 struct ifc * 3574 ifc_find(name) 3575 char *name; 3576 { 3577 struct ifc *ifcp; 3578 3579 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 3580 if (strcmp(name, ifcp->ifc_name) == 0) 3581 return ifcp; 3582 } 3583 return (struct ifc *)NULL; 3584 } 3585 3586 struct iff * 3587 iff_find(ifcp, type) 3588 struct ifc *ifcp; 3589 int type; 3590 { 3591 struct iff *iffp; 3592 3593 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 3594 if (iffp->iff_type == type) 3595 return iffp; 3596 } 3597 return NULL; 3598 } 3599 3600 void 3601 setindex2ifc(idx, ifcp) 3602 int idx; 3603 struct ifc *ifcp; 3604 { 3605 int n, nsize; 3606 struct ifc **p; 3607 3608 if (!index2ifc) { 3609 nindex2ifc = 5; /*initial guess*/ 3610 index2ifc = (struct ifc **) 3611 malloc(sizeof(*index2ifc) * nindex2ifc); 3612 if (index2ifc == NULL) { 3613 fatal("malloc"); 3614 /*NOTREACHED*/ 3615 } 3616 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc); 3617 } 3618 n = nindex2ifc; 3619 for (nsize = nindex2ifc; nsize <= idx; nsize *= 2) 3620 ; 3621 if (n != nsize) { 3622 p = (struct ifc **)realloc(index2ifc, 3623 sizeof(*index2ifc) * nsize); 3624 if (p == NULL) { 3625 fatal("realloc"); 3626 /*NOTREACHED*/ 3627 } 3628 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n)); 3629 index2ifc = p; 3630 nindex2ifc = nsize; 3631 } 3632 index2ifc[idx] = ifcp; 3633 } 3634