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(%zd)\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_GET: 1756 case RTM_LOCK: 1757 /* nothing to be done here */ 1758 trace(1, "\tnothing to be done, ignored\n"); 1759 continue; 1760 } 1761 1762 #if 0 1763 if (rta[RTAX_DST] == NULL) { 1764 trace(1, "\tno destination, ignored\n"); 1765 continue; 1766 } 1767 if (rta[RTAX_DST]->sin6_family != AF_INET6) { 1768 trace(1, "\taf mismatch, ignored\n"); 1769 continue; 1770 } 1771 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) { 1772 trace(1, "\tlinklocal destination, ignored\n"); 1773 continue; 1774 } 1775 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) { 1776 trace(1, "\tloopback destination, ignored\n"); 1777 continue; /* Loopback */ 1778 } 1779 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) { 1780 trace(1, "\tmulticast destination, ignored\n"); 1781 continue; 1782 } 1783 #endif 1784 1785 /* hard ones */ 1786 switch (((struct rt_msghdr *)p)->rtm_type) { 1787 case RTM_NEWADDR: 1788 case RTM_IFINFO: 1789 case RTM_ADD: 1790 case RTM_LOSING: 1791 case RTM_MISS: 1792 case RTM_GET: 1793 case RTM_LOCK: 1794 /* should already be handled */ 1795 fatal("rtrecv: never reach here"); 1796 /*NOTREACHED*/ 1797 case RTM_DELETE: 1798 if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) { 1799 trace(1, "\tsome of dst/gw/netamsk are " 1800 "unavailable, ignored\n"); 1801 break; 1802 } 1803 if ((rtm->rtm_flags & RTF_HOST) != 0) { 1804 mask.sin6_len = sizeof(mask); 1805 memset(&mask.sin6_addr, 0xff, 1806 sizeof(mask.sin6_addr)); 1807 rta[RTAX_NETMASK] = &mask; 1808 } else if (!rta[RTAX_NETMASK]) { 1809 trace(1, "\tsome of dst/gw/netamsk are " 1810 "unavailable, ignored\n"); 1811 break; 1812 } 1813 if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY], 1814 rta[RTAX_NETMASK]) == 0) { 1815 rtable++; /*just to be sure*/ 1816 } 1817 break; 1818 case RTM_CHANGE: 1819 case RTM_REDIRECT: 1820 trace(1, "\tnot supported yet, ignored\n"); 1821 break; 1822 case RTM_DELADDR: 1823 if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) { 1824 trace(1, "\tno netmask or ifa given, ignored\n"); 1825 break; 1826 } 1827 if (ifam->ifam_index < nindex2ifc) 1828 ifcp = index2ifc[ifam->ifam_index]; 1829 else 1830 ifcp = NULL; 1831 if (!ifcp) { 1832 trace(1, "\tinvalid ifam_index %d, ignored\n", 1833 ifam->ifam_index); 1834 break; 1835 } 1836 if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK])) 1837 iface++; 1838 break; 1839 case RTM_OLDADD: 1840 case RTM_OLDDEL: 1841 trace(1, "\tnot supported yet, ignored\n"); 1842 break; 1843 } 1844 1845 } 1846 1847 if (iface) { 1848 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n"); 1849 ifconfig(); 1850 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) 1851 if (ifcp->ifc_cflags & IFC_CHANGED) { 1852 if (ifrt(ifcp, 1)) { 1853 for (ic = ifc; ic; ic = ic->ifc_next) { 1854 if (ifcp->ifc_index == ic->ifc_index) 1855 continue; 1856 if (ic->ifc_flags & IFF_UP) 1857 ripsend(ic, &ic->ifc_ripsin, 1858 RRTF_CHANGED); 1859 } 1860 /* Reset the flag */ 1861 for (rrt = riprt; rrt; rrt = rrt->rrt_next) 1862 rrt->rrt_rflags &= ~RRTF_CHANGED; 1863 } 1864 ifcp->ifc_cflags &= ~IFC_CHANGED; 1865 } 1866 } 1867 if (rtable) { 1868 trace(1, "rtsock: read routing table again\n"); 1869 krtread(1); 1870 } 1871 } 1872 1873 /* 1874 * remove specified route from the internal routing table. 1875 */ 1876 int 1877 rt_del(sdst, sgw, smask) 1878 const struct sockaddr_in6 *sdst; 1879 const struct sockaddr_in6 *sgw; 1880 const struct sockaddr_in6 *smask; 1881 { 1882 const struct in6_addr *dst = NULL; 1883 const struct in6_addr *gw = NULL; 1884 int prefix; 1885 struct netinfo6 ni6; 1886 struct riprt *rrt = NULL; 1887 time_t t_lifetime; 1888 1889 if (sdst->sin6_family != AF_INET6) { 1890 trace(1, "\tother AF, ignored\n"); 1891 return -1; 1892 } 1893 if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr) 1894 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback) 1895 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) { 1896 trace(1, "\taddress %s not interesting, ignored\n", 1897 inet6_n2p(&sdst->sin6_addr)); 1898 return -1; 1899 } 1900 dst = &sdst->sin6_addr; 1901 if (sgw->sin6_family == AF_INET6) { 1902 /* easy case */ 1903 gw = &sgw->sin6_addr; 1904 prefix = sin6mask2len(smask); 1905 } else if (sgw->sin6_family == AF_LINK) { 1906 /* 1907 * Interface route... a hard case. We need to get the prefix 1908 * length from the kernel, but we now are parsing rtmsg. 1909 * We'll purge matching routes from my list, then get the 1910 * fresh list. 1911 */ 1912 struct riprt *longest; 1913 trace(1, "\t%s is an interface route, guessing prefixlen\n", 1914 inet6_n2p(dst)); 1915 longest = NULL; 1916 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 1917 if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 1918 &sdst->sin6_addr) 1919 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) { 1920 if (!longest 1921 || longest->rrt_info.rip6_plen < 1922 rrt->rrt_info.rip6_plen) { 1923 longest = rrt; 1924 } 1925 } 1926 } 1927 rrt = longest; 1928 if (!rrt) { 1929 trace(1, "\tno matching interface route found\n"); 1930 return -1; 1931 } 1932 gw = &in6addr_loopback; 1933 prefix = rrt->rrt_info.rip6_plen; 1934 } else { 1935 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family); 1936 return -1; 1937 } 1938 1939 trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix); 1940 trace(1, "gw %s\n", inet6_n2p(gw)); 1941 t_lifetime = time(NULL) - RIP_LIFETIME; 1942 /* age route for interface address */ 1943 memset(&ni6, 0, sizeof(ni6)); 1944 ni6.rip6_dest = *dst; 1945 ni6.rip6_plen = prefix; 1946 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 1947 trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest), 1948 ni6.rip6_plen); 1949 if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) { 1950 trace(1, "\tno route found\n"); 1951 return -1; 1952 } 1953 #if 0 1954 if ((rrt->rrt_flags & RTF_STATIC) == 0) { 1955 trace(1, "\tyou can delete static routes only\n"); 1956 } else 1957 #endif 1958 if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) { 1959 trace(1, "\tgw mismatch: %s <-> ", 1960 inet6_n2p(&rrt->rrt_gw)); 1961 trace(1, "%s\n", inet6_n2p(gw)); 1962 } else { 1963 trace(1, "\troute found, age it\n"); 1964 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 1965 rrt->rrt_t = t_lifetime; 1966 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 1967 } 1968 } 1969 return 0; 1970 } 1971 1972 /* 1973 * remove specified address from internal interface/routing table. 1974 */ 1975 int 1976 rt_deladdr(ifcp, sifa, smask) 1977 struct ifc *ifcp; 1978 const struct sockaddr_in6 *sifa; 1979 const struct sockaddr_in6 *smask; 1980 { 1981 const struct in6_addr *addr = NULL; 1982 int prefix; 1983 struct ifac *ifa = NULL; 1984 struct netinfo6 ni6; 1985 struct riprt *rrt = NULL; 1986 time_t t_lifetime; 1987 int updated = 0; 1988 1989 if (sifa->sin6_family != AF_INET6) { 1990 trace(1, "\tother AF, ignored\n"); 1991 return -1; 1992 } 1993 addr = &sifa->sin6_addr; 1994 prefix = sin6mask2len(smask); 1995 1996 trace(1, "\tdeleting %s/%d from %s\n", 1997 inet6_n2p(addr), prefix, ifcp->ifc_name); 1998 ifa = ifa_match(ifcp, addr, prefix); 1999 if (!ifa) { 2000 trace(1, "\tno matching ifa found for %s/%d on %s\n", 2001 inet6_n2p(addr), prefix, ifcp->ifc_name); 2002 return -1; 2003 } 2004 if (ifa->ifa_conf != ifcp) { 2005 trace(1, "\taddress table corrupt: back pointer does not match " 2006 "(%s != %s)\n", 2007 ifcp->ifc_name, ifa->ifa_conf->ifc_name); 2008 return -1; 2009 } 2010 /* remove ifa from interface */ 2011 if (ifcp->ifc_addr == ifa) 2012 ifcp->ifc_addr = ifa->ifa_next; 2013 else { 2014 struct ifac *p; 2015 for (p = ifcp->ifc_addr; p; p = p->ifa_next) { 2016 if (p->ifa_next == ifa) { 2017 p->ifa_next = ifa->ifa_next; 2018 break; 2019 } 2020 } 2021 } 2022 ifa->ifa_next = NULL; 2023 ifa->ifa_conf = NULL; 2024 t_lifetime = time(NULL) - RIP_LIFETIME; 2025 /* age route for interface address */ 2026 memset(&ni6, 0, sizeof(ni6)); 2027 ni6.rip6_dest = ifa->ifa_addr; 2028 ni6.rip6_plen = ifa->ifa_plen; 2029 applyplen(&ni6.rip6_dest, ni6.rip6_plen); 2030 trace(1, "\tfind interface route %s/%d on %d\n", 2031 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index); 2032 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 2033 struct in6_addr none; 2034 memset(&none, 0, sizeof(none)); 2035 if (rrt->rrt_index == ifcp->ifc_index && 2036 (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) || 2037 IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) { 2038 trace(1, "\troute found, age it\n"); 2039 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 2040 rrt->rrt_t = t_lifetime; 2041 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 2042 } 2043 updated++; 2044 } else { 2045 trace(1, "\tnon-interface route found: %s/%d on %d\n", 2046 inet6_n2p(&rrt->rrt_info.rip6_dest), 2047 rrt->rrt_info.rip6_plen, 2048 rrt->rrt_index); 2049 } 2050 } else 2051 trace(1, "\tno interface route found\n"); 2052 /* age route for p2p destination */ 2053 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 2054 memset(&ni6, 0, sizeof(ni6)); 2055 ni6.rip6_dest = ifa->ifa_raddr; 2056 ni6.rip6_plen = 128; 2057 applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/ 2058 trace(1, "\tfind p2p route %s/%d on %d\n", 2059 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, 2060 ifcp->ifc_index); 2061 if ((rrt = rtsearch(&ni6, NULL)) != NULL) { 2062 if (rrt->rrt_index == ifcp->ifc_index && 2063 IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) { 2064 trace(1, "\troute found, age it\n"); 2065 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) { 2066 rrt->rrt_t = t_lifetime; 2067 rrt->rrt_info.rip6_metric = 2068 HOPCNT_INFINITY6; 2069 updated++; 2070 } 2071 } else { 2072 trace(1, "\tnon-p2p route found: %s/%d on %d\n", 2073 inet6_n2p(&rrt->rrt_info.rip6_dest), 2074 rrt->rrt_info.rip6_plen, 2075 rrt->rrt_index); 2076 } 2077 } else 2078 trace(1, "\tno p2p route found\n"); 2079 } 2080 return updated ? 0 : -1; 2081 } 2082 2083 /* 2084 * Get each interface address and put those interface routes to the route 2085 * list. 2086 */ 2087 int 2088 ifrt(ifcp, again) 2089 struct ifc *ifcp; 2090 int again; 2091 { 2092 struct ifac *ifa; 2093 struct riprt *rrt = NULL, *search_rrt, *prev_rrt, *loop_rrt; 2094 struct netinfo6 *np; 2095 time_t t_lifetime; 2096 int need_trigger = 0; 2097 2098 #if 0 2099 if (ifcp->ifc_flags & IFF_LOOPBACK) 2100 return 0; /* ignore loopback */ 2101 #endif 2102 2103 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 2104 ifrt_p2p(ifcp, again); 2105 return 0; 2106 } 2107 2108 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2109 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) { 2110 #if 0 2111 trace(1, "route: %s on %s: " 2112 "skip linklocal interface address\n", 2113 inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name); 2114 #endif 2115 continue; 2116 } 2117 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) { 2118 #if 0 2119 trace(1, "route: %s: skip unspec interface address\n", 2120 ifcp->ifc_name); 2121 #endif 2122 continue; 2123 } 2124 if (IN6_IS_ADDR_LOOPBACK(&ifa->ifa_addr)) { 2125 #if 0 2126 trace(1, "route: %s: skip loopback address\n", 2127 ifcp->ifc_name); 2128 #endif 2129 continue; 2130 } 2131 if (ifcp->ifc_flags & IFF_UP) { 2132 if ((rrt = MALLOC(struct riprt)) == NULL) 2133 fatal("malloc: struct riprt"); 2134 memset(rrt, 0, sizeof(*rrt)); 2135 rrt->rrt_same = NULL; 2136 rrt->rrt_index = ifcp->ifc_index; 2137 rrt->rrt_t = 0; /* don't age */ 2138 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2139 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2140 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2141 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 2142 rrt->rrt_flags = RTF_HOST; 2143 rrt->rrt_rflags |= RRTF_CHANGED; 2144 applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen); 2145 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2146 rrt->rrt_gw = ifa->ifa_addr; 2147 np = &rrt->rrt_info; 2148 search_rrt = rtsearch(np, &prev_rrt); 2149 if (search_rrt != NULL) { 2150 if (search_rrt->rrt_info.rip6_metric <= 2151 rrt->rrt_info.rip6_metric) { 2152 /* Already have better route */ 2153 if (!again) { 2154 trace(1, "route: %s/%d: " 2155 "already registered (%s)\n", 2156 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2157 ifcp->ifc_name); 2158 } 2159 goto next; 2160 } 2161 2162 if (prev_rrt) 2163 prev_rrt->rrt_next = rrt->rrt_next; 2164 else 2165 riprt = rrt->rrt_next; 2166 delroute(&rrt->rrt_info, &rrt->rrt_gw); 2167 } 2168 /* Attach the route to the list */ 2169 trace(1, "route: %s/%d: register route (%s)\n", 2170 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2171 ifcp->ifc_name); 2172 rrt->rrt_next = riprt; 2173 riprt = rrt; 2174 addroute(rrt, &rrt->rrt_gw, ifcp); 2175 rrt = NULL; 2176 sendrequest(ifcp); 2177 ripsend(ifcp, &ifcp->ifc_ripsin, 0); 2178 need_trigger = 1; 2179 } else { 2180 for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) { 2181 if (loop_rrt->rrt_index == ifcp->ifc_index) { 2182 t_lifetime = time(NULL) - RIP_LIFETIME; 2183 if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) { 2184 loop_rrt->rrt_t = t_lifetime; 2185 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6; 2186 loop_rrt->rrt_rflags |= RRTF_CHANGED; 2187 need_trigger = 1; 2188 } 2189 } 2190 } 2191 } 2192 next: 2193 if (rrt) 2194 free(rrt); 2195 } 2196 return need_trigger; 2197 } 2198 2199 /* 2200 * there are couple of p2p interface routing models. "behavior" lets 2201 * you pick one. it looks that gated behavior fits best with BSDs, 2202 * since BSD kernels do not look at prefix length on p2p interfaces. 2203 */ 2204 void 2205 ifrt_p2p(ifcp, again) 2206 struct ifc *ifcp; 2207 int again; 2208 { 2209 struct ifac *ifa; 2210 struct riprt *rrt, *orrt, *prevrrt; 2211 struct netinfo6 *np; 2212 struct in6_addr addr, dest; 2213 int advert, ignore, i; 2214 #define P2PADVERT_NETWORK 1 2215 #define P2PADVERT_ADDR 2 2216 #define P2PADVERT_DEST 4 2217 #define P2PADVERT_MAX 4 2218 const enum { CISCO, GATED, ROUTE6D } behavior = GATED; 2219 const char *category = ""; 2220 const char *noadv; 2221 2222 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 2223 addr = ifa->ifa_addr; 2224 dest = ifa->ifa_raddr; 2225 applyplen(&addr, ifa->ifa_plen); 2226 applyplen(&dest, ifa->ifa_plen); 2227 advert = ignore = 0; 2228 switch (behavior) { 2229 case CISCO: 2230 /* 2231 * honor addr/plen, just like normal shared medium 2232 * interface. this may cause trouble if you reuse 2233 * addr/plen on other interfaces. 2234 * 2235 * advertise addr/plen. 2236 */ 2237 advert |= P2PADVERT_NETWORK; 2238 break; 2239 case GATED: 2240 /* 2241 * prefixlen on p2p interface is meaningless. 2242 * advertise addr/128 and dest/128. 2243 * 2244 * do not install network route to route6d routing 2245 * table (if we do, it would prevent route installation 2246 * for other p2p interface that shares addr/plen). 2247 * 2248 * XXX what should we do if dest is ::? it will not 2249 * get announced anyways (see following filter), 2250 * but we need to think. 2251 */ 2252 advert |= P2PADVERT_ADDR; 2253 advert |= P2PADVERT_DEST; 2254 ignore |= P2PADVERT_NETWORK; 2255 break; 2256 case ROUTE6D: 2257 /* 2258 * just for testing. actually the code is redundant 2259 * given the current p2p interface address assignment 2260 * rule for kame kernel. 2261 * 2262 * intent: 2263 * A/n -> announce A/n 2264 * A B/n, A and B share prefix -> A/n (= B/n) 2265 * A B/n, do not share prefix -> A/128 and B/128 2266 * actually, A/64 and A B/128 are the only cases 2267 * permitted by the kernel: 2268 * A/64 -> A/64 2269 * A B/128 -> A/128 and B/128 2270 */ 2271 if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) { 2272 if (IN6_ARE_ADDR_EQUAL(&addr, &dest)) 2273 advert |= P2PADVERT_NETWORK; 2274 else { 2275 advert |= P2PADVERT_ADDR; 2276 advert |= P2PADVERT_DEST; 2277 ignore |= P2PADVERT_NETWORK; 2278 } 2279 } else 2280 advert |= P2PADVERT_NETWORK; 2281 break; 2282 } 2283 2284 for (i = 1; i <= P2PADVERT_MAX; i *= 2) { 2285 if ((ignore & i) != 0) 2286 continue; 2287 if ((rrt = MALLOC(struct riprt)) == NULL) { 2288 fatal("malloc: struct riprt"); 2289 /*NOTREACHED*/ 2290 } 2291 memset(rrt, 0, sizeof(*rrt)); 2292 rrt->rrt_same = NULL; 2293 rrt->rrt_index = ifcp->ifc_index; 2294 rrt->rrt_t = 0; /* don't age */ 2295 switch (i) { 2296 case P2PADVERT_NETWORK: 2297 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2298 rrt->rrt_info.rip6_plen = ifa->ifa_plen; 2299 applyplen(&rrt->rrt_info.rip6_dest, 2300 ifa->ifa_plen); 2301 category = "network"; 2302 break; 2303 case P2PADVERT_ADDR: 2304 rrt->rrt_info.rip6_dest = ifa->ifa_addr; 2305 rrt->rrt_info.rip6_plen = 128; 2306 rrt->rrt_gw = in6addr_loopback; 2307 category = "addr"; 2308 break; 2309 case P2PADVERT_DEST: 2310 rrt->rrt_info.rip6_dest = ifa->ifa_raddr; 2311 rrt->rrt_info.rip6_plen = 128; 2312 rrt->rrt_gw = ifa->ifa_addr; 2313 category = "dest"; 2314 break; 2315 } 2316 if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) || 2317 IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) { 2318 #if 0 2319 trace(1, "route: %s: skip unspec/linklocal " 2320 "(%s on %s)\n", category, ifcp->ifc_name); 2321 #endif 2322 free(rrt); 2323 continue; 2324 } 2325 if ((advert & i) == 0) { 2326 rrt->rrt_rflags |= RRTF_NOADVERTISE; 2327 noadv = ", NO-ADV"; 2328 } else 2329 noadv = ""; 2330 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 2331 rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric; 2332 np = &rrt->rrt_info; 2333 orrt = rtsearch(np, &prevrrt); 2334 if (!orrt) { 2335 /* Attach the route to the list */ 2336 trace(1, "route: %s/%d: register route " 2337 "(%s on %s%s)\n", 2338 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2339 category, ifcp->ifc_name, noadv); 2340 rrt->rrt_next = riprt; 2341 riprt = rrt; 2342 } else if (rrt->rrt_index != orrt->rrt_index || 2343 rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) { 2344 /* swap route */ 2345 rrt->rrt_next = orrt->rrt_next; 2346 if (prevrrt) 2347 prevrrt->rrt_next = rrt; 2348 else 2349 riprt = rrt; 2350 free(orrt); 2351 2352 trace(1, "route: %s/%d: update (%s on %s%s)\n", 2353 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2354 category, ifcp->ifc_name, noadv); 2355 } else { 2356 /* Already found */ 2357 if (!again) { 2358 trace(1, "route: %s/%d: " 2359 "already registered (%s on %s%s)\n", 2360 inet6_n2p(&np->rip6_dest), 2361 np->rip6_plen, category, 2362 ifcp->ifc_name, noadv); 2363 } 2364 free(rrt); 2365 } 2366 } 2367 } 2368 #undef P2PADVERT_NETWORK 2369 #undef P2PADVERT_ADDR 2370 #undef P2PADVERT_DEST 2371 #undef P2PADVERT_MAX 2372 } 2373 2374 int 2375 getifmtu(ifindex) 2376 int ifindex; 2377 { 2378 int mib[6]; 2379 char *buf; 2380 size_t msize; 2381 struct if_msghdr *ifm; 2382 int mtu; 2383 2384 mib[0] = CTL_NET; 2385 mib[1] = PF_ROUTE; 2386 mib[2] = 0; 2387 mib[3] = AF_INET6; 2388 mib[4] = NET_RT_IFLIST; 2389 mib[5] = ifindex; 2390 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2391 fatal("sysctl estimate NET_RT_IFLIST"); 2392 /*NOTREACHED*/ 2393 } 2394 if ((buf = malloc(msize)) == NULL) { 2395 fatal("malloc"); 2396 /*NOTREACHED*/ 2397 } 2398 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2399 fatal("sysctl NET_RT_IFLIST"); 2400 /*NOTREACHED*/ 2401 } 2402 ifm = (struct if_msghdr *)buf; 2403 mtu = ifm->ifm_data.ifi_mtu; 2404 if (ifindex != ifm->ifm_index) { 2405 fatal("ifindex does not match with ifm_index"); 2406 /*NOTREACHED*/ 2407 } 2408 free(buf); 2409 return mtu; 2410 } 2411 2412 const char * 2413 rttypes(rtm) 2414 struct rt_msghdr *rtm; 2415 { 2416 #define RTTYPE(s, f) \ 2417 do { \ 2418 if (rtm->rtm_type == (f)) \ 2419 return (s); \ 2420 } while (0) 2421 RTTYPE("ADD", RTM_ADD); 2422 RTTYPE("DELETE", RTM_DELETE); 2423 RTTYPE("CHANGE", RTM_CHANGE); 2424 RTTYPE("GET", RTM_GET); 2425 RTTYPE("LOSING", RTM_LOSING); 2426 RTTYPE("REDIRECT", RTM_REDIRECT); 2427 RTTYPE("MISS", RTM_MISS); 2428 RTTYPE("LOCK", RTM_LOCK); 2429 RTTYPE("OLDADD", RTM_OLDADD); 2430 RTTYPE("OLDDEL", RTM_OLDDEL); 2431 RTTYPE("NEWADDR", RTM_NEWADDR); 2432 RTTYPE("DELADDR", RTM_DELADDR); 2433 RTTYPE("IFINFO", RTM_IFINFO); 2434 #ifdef RTM_OLDADD 2435 RTTYPE("OLDADD", RTM_OLDADD); 2436 #endif 2437 #ifdef RTM_OLDDEL 2438 RTTYPE("OLDDEL", RTM_OLDDEL); 2439 #endif 2440 #ifdef RTM_OIFINFO 2441 RTTYPE("OIFINFO", RTM_OIFINFO); 2442 #endif 2443 #ifdef RTM_IFANNOUNCE 2444 RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE); 2445 #endif 2446 #ifdef RTM_NEWMADDR 2447 RTTYPE("NEWMADDR", RTM_NEWMADDR); 2448 #endif 2449 #ifdef RTM_DELMADDR 2450 RTTYPE("DELMADDR", RTM_DELMADDR); 2451 #endif 2452 #undef RTTYPE 2453 return NULL; 2454 } 2455 2456 const char * 2457 rtflags(rtm) 2458 struct rt_msghdr *rtm; 2459 { 2460 static char buf[BUFSIZ]; 2461 2462 /* 2463 * letter conflict should be okay. painful when *BSD diverges... 2464 */ 2465 strlcpy(buf, "", sizeof(buf)); 2466 #define RTFLAG(s, f) \ 2467 do { \ 2468 if (rtm->rtm_flags & (f)) \ 2469 strlcat(buf, (s), sizeof(buf)); \ 2470 } while (0) 2471 RTFLAG("U", RTF_UP); 2472 RTFLAG("G", RTF_GATEWAY); 2473 RTFLAG("H", RTF_HOST); 2474 RTFLAG("R", RTF_REJECT); 2475 RTFLAG("D", RTF_DYNAMIC); 2476 RTFLAG("M", RTF_MODIFIED); 2477 RTFLAG("d", RTF_DONE); 2478 #ifdef RTF_MASK 2479 RTFLAG("m", RTF_MASK); 2480 #endif 2481 #ifdef RTF_CLONING 2482 RTFLAG("C", RTF_CLONING); 2483 #endif 2484 #ifdef RTF_CLONED 2485 RTFLAG("c", RTF_CLONED); 2486 #endif 2487 #ifdef RTF_PRCLONING 2488 RTFLAG("c", RTF_PRCLONING); 2489 #endif 2490 #ifdef RTF_WASCLONED 2491 RTFLAG("W", RTF_WASCLONED); 2492 #endif 2493 RTFLAG("X", RTF_XRESOLVE); 2494 #ifdef RTF_LLINFO 2495 RTFLAG("L", RTF_LLINFO); 2496 #endif 2497 RTFLAG("S", RTF_STATIC); 2498 RTFLAG("B", RTF_BLACKHOLE); 2499 #ifdef RTF_PROTO3 2500 RTFLAG("3", RTF_PROTO3); 2501 #endif 2502 RTFLAG("2", RTF_PROTO2); 2503 RTFLAG("1", RTF_PROTO1); 2504 #ifdef RTF_BROADCAST 2505 RTFLAG("b", RTF_BROADCAST); 2506 #endif 2507 #ifdef RTF_DEFAULT 2508 RTFLAG("d", RTF_DEFAULT); 2509 #endif 2510 #ifdef RTF_ISAROUTER 2511 RTFLAG("r", RTF_ISAROUTER); 2512 #endif 2513 #ifdef RTF_TUNNEL 2514 RTFLAG("T", RTF_TUNNEL); 2515 #endif 2516 #ifdef RTF_AUTH 2517 RTFLAG("A", RTF_AUTH); 2518 #endif 2519 #ifdef RTF_CRYPT 2520 RTFLAG("E", RTF_CRYPT); 2521 #endif 2522 #undef RTFLAG 2523 return buf; 2524 } 2525 2526 const char * 2527 ifflags(flags) 2528 int flags; 2529 { 2530 static char buf[BUFSIZ]; 2531 2532 strlcpy(buf, "", sizeof(buf)); 2533 #define IFFLAG(s, f) \ 2534 do { \ 2535 if (flags & (f)) { \ 2536 if (buf[0]) \ 2537 strlcat(buf, ",", sizeof(buf)); \ 2538 strlcat(buf, (s), sizeof(buf)); \ 2539 } \ 2540 } while (0) 2541 IFFLAG("UP", IFF_UP); 2542 IFFLAG("BROADCAST", IFF_BROADCAST); 2543 IFFLAG("DEBUG", IFF_DEBUG); 2544 IFFLAG("LOOPBACK", IFF_LOOPBACK); 2545 IFFLAG("POINTOPOINT", IFF_POINTOPOINT); 2546 #ifdef IFF_NOTRAILERS 2547 IFFLAG("NOTRAILERS", IFF_NOTRAILERS); 2548 #endif 2549 #ifdef IFF_SMART 2550 IFFLAG("SMART", IFF_SMART); 2551 #endif 2552 IFFLAG("RUNNING", IFF_RUNNING); 2553 IFFLAG("NOARP", IFF_NOARP); 2554 IFFLAG("PROMISC", IFF_PROMISC); 2555 IFFLAG("ALLMULTI", IFF_ALLMULTI); 2556 IFFLAG("OACTIVE", IFF_OACTIVE); 2557 IFFLAG("SIMPLEX", IFF_SIMPLEX); 2558 IFFLAG("LINK0", IFF_LINK0); 2559 IFFLAG("LINK1", IFF_LINK1); 2560 IFFLAG("LINK2", IFF_LINK2); 2561 IFFLAG("MULTICAST", IFF_MULTICAST); 2562 #undef IFFLAG 2563 return buf; 2564 } 2565 2566 void 2567 krtread(again) 2568 int again; 2569 { 2570 int mib[6]; 2571 size_t msize; 2572 char *buf, *p, *lim; 2573 struct rt_msghdr *rtm; 2574 int retry; 2575 const char *errmsg; 2576 2577 retry = 0; 2578 buf = NULL; 2579 mib[0] = CTL_NET; 2580 mib[1] = PF_ROUTE; 2581 mib[2] = 0; 2582 mib[3] = AF_INET6; /* Address family */ 2583 mib[4] = NET_RT_DUMP; /* Dump the kernel routing table */ 2584 mib[5] = 0; /* No flags */ 2585 do { 2586 retry++; 2587 errmsg = NULL; 2588 if (buf) 2589 free(buf); 2590 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) { 2591 errmsg = "sysctl estimate"; 2592 continue; 2593 } 2594 if ((buf = malloc(msize)) == NULL) { 2595 errmsg = "malloc"; 2596 continue; 2597 } 2598 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) { 2599 errmsg = "sysctl NET_RT_DUMP"; 2600 continue; 2601 } 2602 } while (retry < 5 && errmsg != NULL); 2603 if (errmsg) { 2604 fatal("%s (with %d retries, msize=%lu)", errmsg, retry, 2605 (u_long)msize); 2606 /*NOTREACHED*/ 2607 } else if (1 < retry) 2608 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry); 2609 2610 lim = buf + msize; 2611 for (p = buf; p < lim; p += rtm->rtm_msglen) { 2612 rtm = (struct rt_msghdr *)p; 2613 rt_entry(rtm, again); 2614 } 2615 free(buf); 2616 } 2617 2618 void 2619 rt_entry(rtm, again) 2620 struct rt_msghdr *rtm; 2621 int again; 2622 { 2623 struct sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask; 2624 struct sockaddr_in6 *sin6_genmask, *sin6_ifp; 2625 char *rtmp, *ifname = NULL; 2626 struct riprt *rrt, *orrt; 2627 struct netinfo6 *np; 2628 int s; 2629 2630 sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0; 2631 if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags & 2632 (RTF_XRESOLVE|RTF_BLACKHOLE)) { 2633 return; /* not interested in the link route */ 2634 } 2635 /* do not look at cloned routes */ 2636 #ifdef RTF_WASCLONED 2637 if (rtm->rtm_flags & RTF_WASCLONED) 2638 return; 2639 #endif 2640 #ifdef RTF_CLONED 2641 if (rtm->rtm_flags & RTF_CLONED) 2642 return; 2643 #endif 2644 /* 2645 * do not look at dynamic routes. 2646 * netbsd/openbsd cloned routes have UGHD. 2647 */ 2648 if (rtm->rtm_flags & RTF_DYNAMIC) 2649 return; 2650 rtmp = (char *)(rtm + 1); 2651 /* Destination */ 2652 if ((rtm->rtm_addrs & RTA_DST) == 0) 2653 return; /* ignore routes without destination address */ 2654 sin6_dst = (struct sockaddr_in6 *)rtmp; 2655 rtmp += ROUNDUP(sin6_dst->sin6_len); 2656 if (rtm->rtm_addrs & RTA_GATEWAY) { 2657 sin6_gw = (struct sockaddr_in6 *)rtmp; 2658 rtmp += ROUNDUP(sin6_gw->sin6_len); 2659 } 2660 if (rtm->rtm_addrs & RTA_NETMASK) { 2661 sin6_mask = (struct sockaddr_in6 *)rtmp; 2662 rtmp += ROUNDUP(sin6_mask->sin6_len); 2663 } 2664 if (rtm->rtm_addrs & RTA_GENMASK) { 2665 sin6_genmask = (struct sockaddr_in6 *)rtmp; 2666 rtmp += ROUNDUP(sin6_genmask->sin6_len); 2667 } 2668 if (rtm->rtm_addrs & RTA_IFP) { 2669 sin6_ifp = (struct sockaddr_in6 *)rtmp; 2670 rtmp += ROUNDUP(sin6_ifp->sin6_len); 2671 } 2672 2673 /* Destination */ 2674 if (sin6_dst->sin6_family != AF_INET6) 2675 return; 2676 if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr)) 2677 return; /* Link-local */ 2678 if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback)) 2679 return; /* Loopback */ 2680 if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr)) 2681 return; 2682 2683 if ((rrt = MALLOC(struct riprt)) == NULL) { 2684 fatal("malloc: struct riprt"); 2685 /*NOTREACHED*/ 2686 } 2687 memset(rrt, 0, sizeof(*rrt)); 2688 np = &rrt->rrt_info; 2689 rrt->rrt_same = NULL; 2690 rrt->rrt_t = time(NULL); 2691 if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC)) 2692 rrt->rrt_t = 0; /* Don't age static routes */ 2693 if ((rtm->rtm_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST) 2694 rrt->rrt_t = 0; /* Don't age non-gateway host routes */ 2695 np->rip6_tag = 0; 2696 np->rip6_metric = rtm->rtm_rmx.rmx_hopcount; 2697 if (np->rip6_metric < 1) 2698 np->rip6_metric = 1; 2699 rrt->rrt_flags = rtm->rtm_flags; 2700 np->rip6_dest = sin6_dst->sin6_addr; 2701 2702 /* Mask or plen */ 2703 if (rtm->rtm_flags & RTF_HOST) 2704 np->rip6_plen = 128; /* Host route */ 2705 else if (sin6_mask) 2706 np->rip6_plen = sin6mask2len(sin6_mask); 2707 else 2708 np->rip6_plen = 0; 2709 2710 orrt = rtsearch(np, NULL); 2711 if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) { 2712 /* Already found */ 2713 if (!again) { 2714 trace(1, "route: %s/%d flags %s: already registered\n", 2715 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2716 rtflags(rtm)); 2717 } 2718 free(rrt); 2719 return; 2720 } 2721 /* Gateway */ 2722 if (!sin6_gw) 2723 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2724 else { 2725 if (sin6_gw->sin6_family == AF_INET6) 2726 rrt->rrt_gw = sin6_gw->sin6_addr; 2727 else if (sin6_gw->sin6_family == AF_LINK) { 2728 /* XXX in case ppp link? */ 2729 rrt->rrt_gw = in6addr_loopback; 2730 } else 2731 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr)); 2732 } 2733 trace(1, "route: %s/%d flags %s", 2734 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm)); 2735 trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw)); 2736 2737 /* Interface */ 2738 s = rtm->rtm_index; 2739 if (s < nindex2ifc && index2ifc[s]) 2740 ifname = index2ifc[s]->ifc_name; 2741 else { 2742 trace(1, " not configured\n"); 2743 free(rrt); 2744 return; 2745 } 2746 trace(1, " if %s sock %d", ifname, s); 2747 rrt->rrt_index = s; 2748 2749 trace(1, "\n"); 2750 2751 /* Check gateway */ 2752 if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) && 2753 !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw) && 2754 (rrt->rrt_flags & RTF_LOCAL) == 0) { 2755 trace(0, "***** Gateway %s is not a link-local address.\n", 2756 inet6_n2p(&rrt->rrt_gw)); 2757 trace(0, "***** dest(%s) if(%s) -- Not optimized.\n", 2758 inet6_n2p(&rrt->rrt_info.rip6_dest), ifname); 2759 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR; 2760 } 2761 2762 /* Put it to the route list */ 2763 if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) { 2764 /* replace route list */ 2765 rrt->rrt_next = orrt->rrt_next; 2766 *orrt = *rrt; 2767 trace(1, "route: %s/%d flags %s: replace new route\n", 2768 inet6_n2p(&np->rip6_dest), np->rip6_plen, 2769 rtflags(rtm)); 2770 free(rrt); 2771 } else { 2772 rrt->rrt_next = riprt; 2773 riprt = rrt; 2774 } 2775 } 2776 2777 int 2778 addroute(rrt, gw, ifcp) 2779 struct riprt *rrt; 2780 const struct in6_addr *gw; 2781 struct ifc *ifcp; 2782 { 2783 struct netinfo6 *np; 2784 u_char buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ]; 2785 struct rt_msghdr *rtm; 2786 struct sockaddr_in6 *sin6; 2787 int len; 2788 2789 np = &rrt->rrt_info; 2790 inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1)); 2791 inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2)); 2792 tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n", 2793 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2794 np->rip6_metric - 1, buf2); 2795 if (rtlog) 2796 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(), 2797 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1, 2798 np->rip6_metric - 1, buf2); 2799 if (nflag) 2800 return 0; 2801 2802 memset(buf, 0, sizeof(buf)); 2803 rtm = (struct rt_msghdr *)buf; 2804 rtm->rtm_type = RTM_ADD; 2805 rtm->rtm_version = RTM_VERSION; 2806 rtm->rtm_seq = ++seq; 2807 rtm->rtm_pid = pid; 2808 rtm->rtm_flags = rrt->rrt_flags; 2809 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2810 rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1; 2811 rtm->rtm_inits = RTV_HOPCOUNT; 2812 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2813 /* Destination */ 2814 sin6->sin6_len = sizeof(struct sockaddr_in6); 2815 sin6->sin6_family = AF_INET6; 2816 sin6->sin6_addr = np->rip6_dest; 2817 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2818 /* Gateway */ 2819 sin6->sin6_len = sizeof(struct sockaddr_in6); 2820 sin6->sin6_family = AF_INET6; 2821 sin6->sin6_addr = *gw; 2822 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2823 /* Netmask */ 2824 sin6->sin6_len = sizeof(struct sockaddr_in6); 2825 sin6->sin6_family = AF_INET6; 2826 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2827 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2828 2829 len = (char *)sin6 - (char *)buf; 2830 rtm->rtm_msglen = len; 2831 if (write(rtsock, buf, len) > 0) 2832 return 0; 2833 2834 if (errno == EEXIST) { 2835 trace(0, "ADD: Route already exists %s/%d gw %s\n", 2836 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2837 if (rtlog) 2838 fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n", 2839 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1); 2840 } else { 2841 trace(0, "Can not write to rtsock (addroute): %s\n", 2842 strerror(errno)); 2843 if (rtlog) 2844 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2845 strerror(errno)); 2846 } 2847 return -1; 2848 } 2849 2850 int 2851 delroute(np, gw) 2852 struct netinfo6 *np; 2853 struct in6_addr *gw; 2854 { 2855 u_char buf[BUFSIZ], buf2[BUFSIZ]; 2856 struct rt_msghdr *rtm; 2857 struct sockaddr_in6 *sin6; 2858 int len; 2859 2860 inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2)); 2861 tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest), 2862 np->rip6_plen, buf2); 2863 if (rtlog) 2864 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n", 2865 hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2866 if (nflag) 2867 return 0; 2868 2869 memset(buf, 0, sizeof(buf)); 2870 rtm = (struct rt_msghdr *)buf; 2871 rtm->rtm_type = RTM_DELETE; 2872 rtm->rtm_version = RTM_VERSION; 2873 rtm->rtm_seq = ++seq; 2874 rtm->rtm_pid = pid; 2875 rtm->rtm_flags = RTF_UP | RTF_GATEWAY; 2876 if (np->rip6_plen == sizeof(struct in6_addr) * 8) 2877 rtm->rtm_flags |= RTF_HOST; 2878 rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; 2879 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2880 /* Destination */ 2881 sin6->sin6_len = sizeof(struct sockaddr_in6); 2882 sin6->sin6_family = AF_INET6; 2883 sin6->sin6_addr = np->rip6_dest; 2884 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2885 /* Gateway */ 2886 sin6->sin6_len = sizeof(struct sockaddr_in6); 2887 sin6->sin6_family = AF_INET6; 2888 sin6->sin6_addr = *gw; 2889 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2890 /* Netmask */ 2891 sin6->sin6_len = sizeof(struct sockaddr_in6); 2892 sin6->sin6_family = AF_INET6; 2893 sin6->sin6_addr = *(plen2mask(np->rip6_plen)); 2894 sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2895 2896 len = (char *)sin6 - (char *)buf; 2897 rtm->rtm_msglen = len; 2898 if (write(rtsock, buf, len) >= 0) 2899 return 0; 2900 2901 if (errno == ESRCH) { 2902 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n", 2903 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2904 if (rtlog) 2905 fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n", 2906 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2); 2907 } else { 2908 trace(0, "Can not write to rtsock (delroute): %s\n", 2909 strerror(errno)); 2910 if (rtlog) 2911 fprintf(rtlog, "\tCan not write to rtsock: %s\n", 2912 strerror(errno)); 2913 } 2914 return -1; 2915 } 2916 2917 struct in6_addr * 2918 getroute(np, gw) 2919 struct netinfo6 *np; 2920 struct in6_addr *gw; 2921 { 2922 u_char buf[BUFSIZ]; 2923 int myseq; 2924 int len; 2925 struct rt_msghdr *rtm; 2926 struct sockaddr_in6 *sin6; 2927 2928 rtm = (struct rt_msghdr *)buf; 2929 len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6); 2930 memset(rtm, 0, len); 2931 rtm->rtm_type = RTM_GET; 2932 rtm->rtm_version = RTM_VERSION; 2933 myseq = ++seq; 2934 rtm->rtm_seq = myseq; 2935 rtm->rtm_addrs = RTA_DST; 2936 rtm->rtm_msglen = len; 2937 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2938 sin6->sin6_len = sizeof(struct sockaddr_in6); 2939 sin6->sin6_family = AF_INET6; 2940 sin6->sin6_addr = np->rip6_dest; 2941 if (write(rtsock, buf, len) < 0) { 2942 if (errno == ESRCH) /* No such route found */ 2943 return NULL; 2944 perror("write to rtsock"); 2945 exit(1); 2946 } 2947 do { 2948 if ((len = read(rtsock, buf, sizeof(buf))) < 0) { 2949 perror("read from rtsock"); 2950 exit(1); 2951 } 2952 rtm = (struct rt_msghdr *)buf; 2953 } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid); 2954 sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)]; 2955 if (rtm->rtm_addrs & RTA_DST) { 2956 sin6 = (struct sockaddr_in6 *) 2957 ((char *)sin6 + ROUNDUP(sin6->sin6_len)); 2958 } 2959 if (rtm->rtm_addrs & RTA_GATEWAY) { 2960 *gw = sin6->sin6_addr; 2961 return gw; 2962 } 2963 return NULL; 2964 } 2965 2966 const char * 2967 inet6_n2p(p) 2968 const struct in6_addr *p; 2969 { 2970 static char buf[BUFSIZ]; 2971 2972 return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf)); 2973 } 2974 2975 void 2976 ifrtdump(sig) 2977 int sig; 2978 { 2979 2980 ifdump(sig); 2981 rtdump(sig); 2982 } 2983 2984 void 2985 ifdump(sig) 2986 int sig; 2987 { 2988 struct ifc *ifcp; 2989 FILE *dump; 2990 int i; 2991 2992 if (sig == 0) 2993 dump = stderr; 2994 else 2995 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 2996 dump = stderr; 2997 2998 fprintf(dump, "%s: Interface Table Dump\n", hms()); 2999 fprintf(dump, " Number of interfaces: %d\n", nifc); 3000 for (i = 0; i < 2; i++) { 3001 fprintf(dump, " %sadvertising interfaces:\n", i ? "non-" : ""); 3002 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 3003 if (i == 0) { 3004 if ((ifcp->ifc_flags & IFF_UP) == 0) 3005 continue; 3006 if (iff_find(ifcp, 'N') != NULL) 3007 continue; 3008 } else { 3009 if (ifcp->ifc_flags & IFF_UP) 3010 continue; 3011 } 3012 ifdump0(dump, ifcp); 3013 } 3014 } 3015 fprintf(dump, "\n"); 3016 if (dump != stderr) 3017 fclose(dump); 3018 } 3019 3020 void 3021 ifdump0(dump, ifcp) 3022 FILE *dump; 3023 const struct ifc *ifcp; 3024 { 3025 struct ifac *ifa; 3026 struct iff *iffp; 3027 char buf[BUFSIZ]; 3028 const char *ft; 3029 int addr; 3030 3031 fprintf(dump, " %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n", 3032 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags), 3033 inet6_n2p(&ifcp->ifc_mylladdr), 3034 ifcp->ifc_mtu, ifcp->ifc_metric); 3035 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 3036 if (ifcp->ifc_flags & IFF_POINTOPOINT) { 3037 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, 3038 buf, sizeof(buf)); 3039 fprintf(dump, "\t%s/%d -- %s\n", 3040 inet6_n2p(&ifa->ifa_addr), 3041 ifa->ifa_plen, buf); 3042 } else { 3043 fprintf(dump, "\t%s/%d\n", 3044 inet6_n2p(&ifa->ifa_addr), 3045 ifa->ifa_plen); 3046 } 3047 } 3048 if (ifcp->ifc_filter) { 3049 fprintf(dump, "\tFilter:"); 3050 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 3051 addr = 0; 3052 switch (iffp->iff_type) { 3053 case 'A': 3054 ft = "Aggregate"; addr++; break; 3055 case 'N': 3056 ft = "No-use"; break; 3057 case 'O': 3058 ft = "Advertise-only"; addr++; break; 3059 case 'T': 3060 ft = "Default-only"; break; 3061 case 'L': 3062 ft = "Listen-only"; addr++; break; 3063 default: 3064 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type); 3065 ft = buf; 3066 addr++; 3067 break; 3068 } 3069 fprintf(dump, " %s", ft); 3070 if (addr) { 3071 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr), 3072 iffp->iff_plen); 3073 } 3074 } 3075 fprintf(dump, "\n"); 3076 } 3077 } 3078 3079 void 3080 rtdump(sig) 3081 int sig; 3082 { 3083 struct riprt *rrt; 3084 char buf[BUFSIZ]; 3085 FILE *dump; 3086 time_t t, age; 3087 3088 if (sig == 0) 3089 dump = stderr; 3090 else 3091 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL) 3092 dump = stderr; 3093 3094 t = time(NULL); 3095 fprintf(dump, "\n%s: Routing Table Dump\n", hms()); 3096 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 3097 if (rrt->rrt_t == 0) 3098 age = 0; 3099 else 3100 age = t - rrt->rrt_t; 3101 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest, 3102 buf, sizeof(buf)); 3103 fprintf(dump, " %s/%d if(%d:%s) gw(%s) [%d] age(%ld)", 3104 buf, rrt->rrt_info.rip6_plen, rrt->rrt_index, 3105 index2ifc[rrt->rrt_index]->ifc_name, 3106 inet6_n2p(&rrt->rrt_gw), 3107 rrt->rrt_info.rip6_metric, (long)age); 3108 if (rrt->rrt_info.rip6_tag) { 3109 fprintf(dump, " tag(0x%04x)", 3110 ntohs(rrt->rrt_info.rip6_tag) & 0xffff); 3111 } 3112 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) 3113 fprintf(dump, " NOT-LL"); 3114 if (rrt->rrt_rflags & RRTF_NOADVERTISE) 3115 fprintf(dump, " NO-ADV"); 3116 fprintf(dump, "\n"); 3117 } 3118 fprintf(dump, "\n"); 3119 if (dump != stderr) 3120 fclose(dump); 3121 } 3122 3123 /* 3124 * Parse the -A (and -O) options and put corresponding filter object to the 3125 * specified interface structures. Each of the -A/O option has the following 3126 * syntax: -A 5f09:c400::/32,ef0,ef1 (aggregate) 3127 * -O 5f09:c400::/32,ef0,ef1 (only when match) 3128 */ 3129 void 3130 filterconfig() 3131 { 3132 int i; 3133 char *p, *ap, *iflp, *ifname, *ep; 3134 struct iff ftmp, *iff_obj; 3135 struct ifc *ifcp; 3136 struct riprt *rrt; 3137 #if 0 3138 struct in6_addr gw; 3139 #endif 3140 u_long plen; 3141 3142 for (i = 0; i < nfilter; i++) { 3143 ap = filter[i]; 3144 iflp = NULL; 3145 ifcp = NULL; 3146 if (filtertype[i] == 'N' || filtertype[i] == 'T') { 3147 iflp = ap; 3148 goto ifonly; 3149 } 3150 if ((p = strchr(ap, ',')) != NULL) { 3151 *p++ = '\0'; 3152 iflp = p; 3153 } 3154 if ((p = strchr(ap, '/')) == NULL) { 3155 fatal("no prefixlen specified for '%s'", ap); 3156 /*NOTREACHED*/ 3157 } 3158 *p++ = '\0'; 3159 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) { 3160 fatal("invalid prefix specified for '%s'", ap); 3161 /*NOTREACHED*/ 3162 } 3163 errno = 0; 3164 ep = NULL; 3165 plen = strtoul(p, &ep, 10); 3166 if (errno || !*p || *ep || plen > sizeof(ftmp.iff_addr) * 8) { 3167 fatal("invalid prefix length specified for '%s'", ap); 3168 /*NOTREACHED*/ 3169 } 3170 ftmp.iff_plen = plen; 3171 ftmp.iff_next = NULL; 3172 applyplen(&ftmp.iff_addr, ftmp.iff_plen); 3173 ifonly: 3174 ftmp.iff_type = filtertype[i]; 3175 if (iflp == NULL || *iflp == '\0') { 3176 fatal("no interface specified for '%s'", ap); 3177 /*NOTREACHED*/ 3178 } 3179 /* parse the interface listing portion */ 3180 while (iflp) { 3181 ifname = iflp; 3182 if ((iflp = strchr(iflp, ',')) != NULL) 3183 *iflp++ = '\0'; 3184 ifcp = ifc_find(ifname); 3185 if (ifcp == NULL) { 3186 fatal("no interface %s exists", ifname); 3187 /*NOTREACHED*/ 3188 } 3189 iff_obj = (struct iff *)malloc(sizeof(struct iff)); 3190 if (iff_obj == NULL) { 3191 fatal("malloc of iff_obj"); 3192 /*NOTREACHED*/ 3193 } 3194 memcpy((void *)iff_obj, (void *)&ftmp, 3195 sizeof(struct iff)); 3196 /* link it to the interface filter */ 3197 iff_obj->iff_next = ifcp->ifc_filter; 3198 ifcp->ifc_filter = iff_obj; 3199 } 3200 3201 /* 3202 * -A: aggregate configuration. 3203 */ 3204 if (filtertype[i] != 'A') 3205 continue; 3206 /* put the aggregate to the kernel routing table */ 3207 rrt = (struct riprt *)malloc(sizeof(struct riprt)); 3208 if (rrt == NULL) { 3209 fatal("malloc: rrt"); 3210 /*NOTREACHED*/ 3211 } 3212 memset(rrt, 0, sizeof(struct riprt)); 3213 rrt->rrt_info.rip6_dest = ftmp.iff_addr; 3214 rrt->rrt_info.rip6_plen = ftmp.iff_plen; 3215 rrt->rrt_info.rip6_metric = 1; 3216 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff); 3217 rrt->rrt_gw = in6addr_loopback; 3218 rrt->rrt_flags = RTF_UP | RTF_REJECT; 3219 rrt->rrt_rflags = RRTF_AGGREGATE; 3220 rrt->rrt_t = 0; 3221 rrt->rrt_index = loopifcp->ifc_index; 3222 #if 0 3223 if (getroute(&rrt->rrt_info, &gw)) { 3224 #if 0 3225 /* 3226 * When the address has already been registered in the 3227 * kernel routing table, it should be removed 3228 */ 3229 delroute(&rrt->rrt_info, &gw); 3230 #else 3231 /* it is safer behavior */ 3232 errno = EINVAL; 3233 fatal("%s/%u already in routing table, " 3234 "cannot aggregate", 3235 inet6_n2p(&rrt->rrt_info.rip6_dest), 3236 rrt->rrt_info.rip6_plen); 3237 /*NOTREACHED*/ 3238 #endif 3239 } 3240 #endif 3241 /* Put the route to the list */ 3242 rrt->rrt_next = riprt; 3243 riprt = rrt; 3244 trace(1, "Aggregate: %s/%d for %s\n", 3245 inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen, 3246 ifcp->ifc_name); 3247 /* Add this route to the kernel */ 3248 if (nflag) /* do not modify kernel routing table */ 3249 continue; 3250 addroute(rrt, &in6addr_loopback, loopifcp); 3251 } 3252 } 3253 3254 /***************** utility functions *****************/ 3255 3256 /* 3257 * Returns a pointer to ifac whose address and prefix length matches 3258 * with the address and prefix length specified in the arguments. 3259 */ 3260 struct ifac * 3261 ifa_match(ifcp, ia, plen) 3262 const struct ifc *ifcp; 3263 const struct in6_addr *ia; 3264 int plen; 3265 { 3266 struct ifac *ifa; 3267 3268 for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) { 3269 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) && 3270 ifa->ifa_plen == plen) 3271 break; 3272 } 3273 return ifa; 3274 } 3275 3276 /* 3277 * Return a pointer to riprt structure whose address and prefix length 3278 * matches with the address and prefix length found in the argument. 3279 * Note: This is not a rtalloc(). Therefore exact match is necessary. 3280 */ 3281 struct riprt * 3282 rtsearch(np, prev_rrt) 3283 struct netinfo6 *np; 3284 struct riprt **prev_rrt; 3285 { 3286 struct riprt *rrt; 3287 3288 if (prev_rrt) 3289 *prev_rrt = NULL; 3290 for (rrt = riprt; rrt; rrt = rrt->rrt_next) { 3291 if (rrt->rrt_info.rip6_plen == np->rip6_plen && 3292 IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest, 3293 &np->rip6_dest)) 3294 return rrt; 3295 if (prev_rrt) 3296 *prev_rrt = rrt; 3297 } 3298 if (prev_rrt) 3299 *prev_rrt = NULL; 3300 return 0; 3301 } 3302 3303 int 3304 sin6mask2len(sin6) 3305 const struct sockaddr_in6 *sin6; 3306 { 3307 3308 return mask2len(&sin6->sin6_addr, 3309 sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr)); 3310 } 3311 3312 int 3313 mask2len(addr, lenlim) 3314 const struct in6_addr *addr; 3315 int lenlim; 3316 { 3317 int i = 0, j; 3318 const u_char *p = (const u_char *)addr; 3319 3320 for (j = 0; j < lenlim; j++, p++) { 3321 if (*p != 0xff) 3322 break; 3323 i += 8; 3324 } 3325 if (j < lenlim) { 3326 switch (*p) { 3327 #define MASKLEN(m, l) case m: do { i += l; break; } while (0) 3328 MASKLEN(0xfe, 7); break; 3329 MASKLEN(0xfc, 6); break; 3330 MASKLEN(0xf8, 5); break; 3331 MASKLEN(0xf0, 4); break; 3332 MASKLEN(0xe0, 3); break; 3333 MASKLEN(0xc0, 2); break; 3334 MASKLEN(0x80, 1); break; 3335 #undef MASKLEN 3336 } 3337 } 3338 return i; 3339 } 3340 3341 void 3342 applymask(addr, mask) 3343 struct in6_addr *addr, *mask; 3344 { 3345 int i; 3346 u_long *p, *q; 3347 3348 p = (u_long *)addr; q = (u_long *)mask; 3349 for (i = 0; i < 4; i++) 3350 *p++ &= *q++; 3351 } 3352 3353 static const u_char plent[8] = { 3354 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe 3355 }; 3356 3357 void 3358 applyplen(ia, plen) 3359 struct in6_addr *ia; 3360 int plen; 3361 { 3362 u_char *p; 3363 int i; 3364 3365 p = ia->s6_addr; 3366 for (i = 0; i < 16; i++) { 3367 if (plen <= 0) 3368 *p = 0; 3369 else if (plen < 8) 3370 *p &= plent[plen]; 3371 p++, plen -= 8; 3372 } 3373 } 3374 3375 static const int pl2m[9] = { 3376 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff 3377 }; 3378 3379 struct in6_addr * 3380 plen2mask(n) 3381 int n; 3382 { 3383 static struct in6_addr ia; 3384 u_char *p; 3385 int i; 3386 3387 memset(&ia, 0, sizeof(struct in6_addr)); 3388 p = (u_char *)&ia; 3389 for (i = 0; i < 16; i++, p++, n -= 8) { 3390 if (n >= 8) { 3391 *p = 0xff; 3392 continue; 3393 } 3394 *p = pl2m[n]; 3395 break; 3396 } 3397 return &ia; 3398 } 3399 3400 char * 3401 allocopy(p) 3402 char *p; 3403 { 3404 int len = strlen(p) + 1; 3405 char *q = (char *)malloc(len); 3406 3407 if (!q) { 3408 fatal("malloc"); 3409 /*NOTREACHED*/ 3410 } 3411 3412 strlcpy(q, p, len); 3413 return q; 3414 } 3415 3416 char * 3417 hms() 3418 { 3419 static char buf[BUFSIZ]; 3420 time_t t; 3421 struct tm *tm; 3422 3423 t = time(NULL); 3424 if ((tm = localtime(&t)) == 0) { 3425 fatal("localtime"); 3426 /*NOTREACHED*/ 3427 } 3428 snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min, 3429 tm->tm_sec); 3430 return buf; 3431 } 3432 3433 #define RIPRANDDEV 1.0 /* 30 +- 15, max - min = 30 */ 3434 3435 int 3436 ripinterval(timer) 3437 int timer; 3438 { 3439 double r = rand(); 3440 3441 interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5)); 3442 nextalarm = time(NULL) + interval; 3443 return interval; 3444 } 3445 3446 time_t 3447 ripsuptrig() 3448 { 3449 time_t t; 3450 3451 double r = rand(); 3452 t = (int)(RIP_TRIG_INT6_MIN + 3453 (RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX)); 3454 sup_trig_update = time(NULL) + t; 3455 return t; 3456 } 3457 3458 void 3459 #ifdef __STDC__ 3460 fatal(const char *fmt, ...) 3461 #else 3462 fatal(fmt, va_alist) 3463 char *fmt; 3464 va_dcl 3465 #endif 3466 { 3467 va_list ap; 3468 char buf[1024]; 3469 3470 #ifdef __STDC__ 3471 va_start(ap, fmt); 3472 #else 3473 va_start(ap); 3474 #endif 3475 vsnprintf(buf, sizeof(buf), fmt, ap); 3476 va_end(ap); 3477 perror(buf); 3478 if (errno) 3479 syslog(LOG_ERR, "%s: %s", buf, strerror(errno)); 3480 else 3481 syslog(LOG_ERR, "%s", buf); 3482 rtdexit(); 3483 } 3484 3485 void 3486 #ifdef __STDC__ 3487 tracet(int level, const char *fmt, ...) 3488 #else 3489 tracet(level, fmt, va_alist) 3490 int level; 3491 char *fmt; 3492 va_dcl 3493 #endif 3494 { 3495 va_list ap; 3496 3497 if (level <= dflag) { 3498 #ifdef __STDC__ 3499 va_start(ap, fmt); 3500 #else 3501 va_start(ap); 3502 #endif 3503 fprintf(stderr, "%s: ", hms()); 3504 vfprintf(stderr, fmt, ap); 3505 va_end(ap); 3506 } 3507 if (dflag) { 3508 #ifdef __STDC__ 3509 va_start(ap, fmt); 3510 #else 3511 va_start(ap); 3512 #endif 3513 if (level > 0) 3514 vsyslog(LOG_DEBUG, fmt, ap); 3515 else 3516 vsyslog(LOG_WARNING, fmt, ap); 3517 va_end(ap); 3518 } 3519 } 3520 3521 void 3522 #ifdef __STDC__ 3523 trace(int level, const char *fmt, ...) 3524 #else 3525 trace(level, fmt, va_alist) 3526 int level; 3527 char *fmt; 3528 va_dcl 3529 #endif 3530 { 3531 va_list ap; 3532 3533 if (level <= dflag) { 3534 #ifdef __STDC__ 3535 va_start(ap, fmt); 3536 #else 3537 va_start(ap); 3538 #endif 3539 vfprintf(stderr, fmt, ap); 3540 va_end(ap); 3541 } 3542 if (dflag) { 3543 #ifdef __STDC__ 3544 va_start(ap, fmt); 3545 #else 3546 va_start(ap); 3547 #endif 3548 if (level > 0) 3549 vsyslog(LOG_DEBUG, fmt, ap); 3550 else 3551 vsyslog(LOG_WARNING, fmt, ap); 3552 va_end(ap); 3553 } 3554 } 3555 3556 unsigned int 3557 if_maxindex() 3558 { 3559 struct if_nameindex *p, *p0; 3560 unsigned int max = 0; 3561 3562 p0 = if_nameindex(); 3563 for (p = p0; p && p->if_index && p->if_name; p++) { 3564 if (max < p->if_index) 3565 max = p->if_index; 3566 } 3567 if_freenameindex(p0); 3568 return max; 3569 } 3570 3571 struct ifc * 3572 ifc_find(name) 3573 char *name; 3574 { 3575 struct ifc *ifcp; 3576 3577 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) { 3578 if (strcmp(name, ifcp->ifc_name) == 0) 3579 return ifcp; 3580 } 3581 return (struct ifc *)NULL; 3582 } 3583 3584 struct iff * 3585 iff_find(ifcp, type) 3586 struct ifc *ifcp; 3587 int type; 3588 { 3589 struct iff *iffp; 3590 3591 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) { 3592 if (iffp->iff_type == type) 3593 return iffp; 3594 } 3595 return NULL; 3596 } 3597 3598 void 3599 setindex2ifc(idx, ifcp) 3600 int idx; 3601 struct ifc *ifcp; 3602 { 3603 int n, nsize; 3604 struct ifc **p; 3605 3606 if (!index2ifc) { 3607 nindex2ifc = 5; /*initial guess*/ 3608 index2ifc = (struct ifc **) 3609 malloc(sizeof(*index2ifc) * nindex2ifc); 3610 if (index2ifc == NULL) { 3611 fatal("malloc"); 3612 /*NOTREACHED*/ 3613 } 3614 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc); 3615 } 3616 n = nindex2ifc; 3617 for (nsize = nindex2ifc; nsize <= idx; nsize *= 2) 3618 ; 3619 if (n != nsize) { 3620 p = (struct ifc **)realloc(index2ifc, 3621 sizeof(*index2ifc) * nsize); 3622 if (p == NULL) { 3623 fatal("realloc"); 3624 /*NOTREACHED*/ 3625 } 3626 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n)); 3627 index2ifc = p; 3628 nindex2ifc = nsize; 3629 } 3630 index2ifc[idx] = ifcp; 3631 } 3632