usr.sbin/route6d/route6d.c

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