usr.sbin/route6d/route6d.c

   1 /*      $FreeBSD: src/usr.sbin/route6d/route6d.c,v 1.2.2.5 2001/07/03 11:02:09 ume Exp $        */
   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  * $KAME: route6d.c,v 1.64 2001/05/08 04:36:37 itojun Exp $
  33  */
  34
  35 #define _KERNEL_STRUCTURES
  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 #include <stdarg.h>
  45 #include <syslog.h>
  46 #include <stddef.h>
  47 #include <errno.h>
  48 #include <err.h>
  49
  50 #include <sys/types.h>
  51 #include <sys/param.h>
  52 #include <sys/file.h>
  53 #include <sys/socket.h>
  54 #include <sys/ioctl.h>
  55 #include <sys/sysctl.h>
  56 #include <sys/uio.h>
  57 #include <net/if.h>
  58 #if defined(__DragonFly__)
  59 #include <net/if_var.h>
  60 #endif /* __DragonFly__  */
  61 #include <net/route.h>
  62 #include <netinet/in.h>
  63 #include <netinet/in_var.h>
  64 #include <netinet/ip6.h>
  65 #include <netinet/udp.h>
  66 #include <netdb.h>
  67 #include <ifaddrs.h>
  68
  69 #include <arpa/inet.h>
  70
  71 #include "route6d.h"
  72
  73 #define MAXFILTER       40
  74
  75 #ifdef  DEBUG
  76 #define INIT_INTERVAL6  6
  77 #else
  78 #define INIT_INTERVAL6  10      /* Wait to submit a initial riprequest */
  79 #endif
  80
  81 /*
  82  * Following two macros are highly depending on KAME Release
  83  */
  84 #define IN6_LINKLOCAL_IFINDEX(addr) \
  85         ((addr).s6_addr[2] << 8 | (addr).s6_addr[3])
  86
  87 #define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \
  88         do { \
  89                 (addr).s6_addr[2] = ((index) >> 8) & 0xff; \
  90                 (addr).s6_addr[3] = (index) & 0xff; \
  91         } while (0)
  92
  93 struct  ifc {                   /* Configuration of an interface */
  94         char    *ifc_name;                      /* if name */
  95         struct  ifc *ifc_next;
  96         int     ifc_index;                      /* if index */
  97         int     ifc_mtu;                        /* if mtu */
  98         int     ifc_metric;                     /* if metric */
  99         u_int   ifc_flags;                      /* flags */
 100         short   ifc_cflags;                     /* IFC_XXX */
 101         struct  in6_addr ifc_mylladdr;          /* my link-local address */
 102         struct  sockaddr_in6 ifc_ripsin;        /* rip multicast address */
 103         struct  iff *ifc_filter;                /* filter structure */
 104         struct  ifac *ifc_addr;                 /* list of AF_INET6 addresses */
 105         int     ifc_joined;                     /* joined to ff02::9 */
 106 };
 107
 108 struct  ifac {                  /* Adddress associated to an interface */
 109         struct  ifc *ifa_conf;          /* back pointer */
 110         struct  ifac *ifa_next;
 111         struct  in6_addr ifa_addr;      /* address */
 112         struct  in6_addr ifa_raddr;     /* remote address, valid in p2p */
 113         int     ifa_plen;               /* prefix length */
 114 };
 115
 116 struct  iff {
 117         int     iff_type;
 118         struct  in6_addr iff_addr;
 119         int     iff_plen;
 120         struct  iff *iff_next;
 121 };
 122
 123 static struct   ifc *ifc;
 124 static int      nifc;           /* number of valid ifc's */
 125 static struct   ifc **index2ifc;
 126 static int      nindex2ifc;
 127 static struct   ifc *loopifcp = NULL;   /* pointing to loopback */
 128 static int      loopifindex = 0;        /* ditto */
 129 static fd_set   sockvec;        /* vector to select() for receiving */
 130 static int      rtsock;         /* the routing socket */
 131 static int      ripsock;        /* socket to send/receive RIP datagram */
 132
 133 static struct   rip6 *ripbuf;   /* packet buffer for sending */
 134
 135 /*
 136  * Maintain the routes in a linked list.  When the number of the routes
 137  * grows, somebody would like to introduce a hash based or a radix tree
 138  * based structure.  I believe the number of routes handled by RIP is
 139  * limited and I don't have to manage a complex data structure, however.
 140  *
 141  * One of the major drawbacks of the linear linked list is the difficulty
 142  * of representing the relationship between a couple of routes.  This may
 143  * be a significant problem when we have to support route aggregation with
 144  * supressing the specifices covered by the aggregate.
 145  */
 146
 147 struct  riprt {
 148         struct  riprt *rrt_next;        /* next destination */
 149         struct  riprt *rrt_same;        /* same destination - future use */
 150         struct  netinfo6 rrt_info;      /* network info */
 151         struct  in6_addr rrt_gw;        /* gateway */
 152         u_long  rrt_flags;              /* kernel routing table flags */
 153         u_long  rrt_rflags;             /* route6d routing table flags */
 154         time_t  rrt_t;                  /* when the route validated */
 155         int     rrt_index;              /* ifindex from which this route got */
 156 };
 157
 158 static struct   riprt *riprt = NULL;
 159
 160 static int      dflag = 0;      /* debug flag */
 161 static int      qflag = 0;      /* quiet flag */
 162 static int      nflag = 0;      /* don't update kernel routing table */
 163 static int      aflag = 0;      /* age out even the statically defined routes */
 164 static int      hflag = 0;      /* don't split horizon */
 165 static int      lflag = 0;      /* exchange site local routes */
 166 static int      sflag = 0;      /* announce static routes w/ split horizon */
 167 static int      Sflag = 0;      /* announce static routes to every interface */
 168 static unsigned long routetag = 0;      /* route tag attached on originating case */
 169
 170 static char     *filter[MAXFILTER];
 171 static int      filtertype[MAXFILTER];
 172 static int      nfilter = 0;
 173
 174 static pid_t    pid;
 175
 176 static struct   sockaddr_storage ripsin;
 177
 178 static int      interval = 1;
 179 static time_t   nextalarm = 0;
 180
 181 static FILE     *rtlog = NULL;
 182
 183 static int logopened = 0;
 184
 185 static  u_long  seq = 0;
 186
 187 static volatile int signo;
 188 static volatile sig_atomic_t seenalrm;
 189 static volatile sig_atomic_t seenquit;
 190 static volatile sig_atomic_t seenusr1;
 191
 192 #define RRTF_AGGREGATE          0x08000000
 193 #define RRTF_NOADVERTISE        0x10000000
 194 #define RRTF_NH_NOT_LLADDR      0x20000000
 195 #define RRTF_SENDANYWAY         0x40000000
 196 #define RRTF_CHANGED            0x80000000
 197
 198 static void sighandler(int);
 199 static void ripalarm(void);
 200 static void riprecv(void);
 201 static void ripsend(struct ifc *, struct sockaddr_in6 *, int);
 202 static int out_filter(struct riprt *, struct ifc *);
 203 static void init(void);
 204 static void ifconfig(void);
 205 static void ifconfig1(const char *, const struct sockaddr *, struct ifc *, int);
 206 static void rtrecv(void);
 207 static int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *,
 208         const struct sockaddr_in6 *);
 209 static int rt_deladdr(struct ifc *, const struct sockaddr_in6 *,
 210         const struct sockaddr_in6 *);
 211 static void filterconfig(void);
 212 static int getifmtu(int);
 213 static const char *rttypes(struct rt_msghdr *);
 214 static const char *rtflags(struct rt_msghdr *);
 215 static const char *ifflags(int);
 216 static int ifrt(struct ifc *, int);
 217 static void ifrt_p2p(struct ifc *, int);
 218 static void applyplen(struct in6_addr *, int);
 219 static void ifrtdump(int);
 220 static void ifdump(int);
 221 static void ifdump0(FILE *, const struct ifc *);
 222 static void rtdump(int);
 223 static void rt_entry(struct rt_msghdr *, int);
 224 static void rtdexit(void) __dead2;
 225 static void riprequest(struct ifc *, struct netinfo6 *, int,
 226         struct sockaddr_in6 *);
 227 static void ripflush(struct ifc *, struct sockaddr_in6 *);
 228 static void sendrequest(struct ifc *);
 229 static int sin6mask2len(const struct sockaddr_in6 *);
 230 static int mask2len(const struct in6_addr *, int);
 231 static int sendpacket(struct sockaddr_in6 *, int);
 232 static int addroute(struct riprt *, const struct in6_addr *, struct ifc *);
 233 static int delroute(struct netinfo6 *, struct in6_addr *);
 234 #if 0
 235 static struct in6_addr *getroute(struct netinfo6 *, struct in6_addr *);
 236 #endif
 237 static void krtread(int);
 238 static int tobeadv(struct riprt *, struct ifc *);
 239 static char *allocopy(char *);
 240 static char *hms(void);
 241 static const char *inet6_n2p(const struct in6_addr *);
 242 static struct ifac *ifa_match(const struct ifc *, const struct in6_addr *, int);
 243 static struct in6_addr *plen2mask(int);
 244 static struct riprt *rtsearch(struct netinfo6 *, struct riprt **);
 245 static int ripinterval(int);
 246 static void fatal(const char *, ...) __dead2 __printflike(1, 2);
 247 static void trace(int, const char *, ...) __printflike(2, 3);
 248 static void tracet(int, const char *, ...) __printflike(2, 3);
 249 static struct ifc *ifc_find(char *);
 250 static struct iff *iff_find(struct ifc *, int);
 251 static void setindex2ifc(int, struct ifc *);
 252
 253 #define MALLOC(type)    ((type *)malloc(sizeof(type)))
 254
 255 int
 256 main(int argc, char **argv)
 257 {
 258         int     ch;
 259         int     error = 0;
 260         struct  ifc *ifcp;
 261         sigset_t mask, omask;
 262         FILE    *pidfile;
 263         char *progname;
 264         char *ep;
 265
 266         progname = strrchr(*argv, '/');
 267         if (progname)
 268                 progname++;
 269         else
 270                 progname = *argv;
 271
 272         pid = getpid();
 273         while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) {
 274                 switch (ch) {
 275                 case 'A':
 276                 case 'N':
 277                 case 'O':
 278                 case 'T':
 279                 case 'L':
 280                         if (nfilter >= MAXFILTER) {
 281                                 fatal("Exceeds MAXFILTER");
 282                                 /*NOTREACHED*/
 283                         }
 284                         filtertype[nfilter] = ch;
 285                         filter[nfilter++] = allocopy(optarg);
 286                         break;
 287                 case 't':
 288                         ep = NULL;
 289                         routetag = strtoul(optarg, &ep, 0);
 290                         if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) {
 291                                 fatal("invalid route tag");
 292                                 /*NOTREACHED*/
 293                         }
 294                         break;
 295                 case 'R':
 296                         if ((rtlog = fopen(optarg, "w")) == NULL) {
 297                                 fatal("Can not write to routelog");
 298                                 /*NOTREACHED*/
 299                         }
 300                         break;
 301 #define FLAG(c, flag, n)        case c: do { flag = n; break; } while(0)
 302                 FLAG('a', aflag, 1); break;
 303                 FLAG('d', dflag, 1); break;
 304                 FLAG('D', dflag, 2); break;
 305                 FLAG('h', hflag, 1); break;
 306                 FLAG('l', lflag, 1); break;
 307                 FLAG('n', nflag, 1); break;
 308                 FLAG('q', qflag, 1); break;
 309                 FLAG('s', sflag, 1); break;
 310                 FLAG('S', Sflag, 1); break;
 311 #undef  FLAG
 312                 default:
 313                         fatal("Invalid option specified, terminating");
 314                         /*NOTREACHED*/
 315                 }
 316         }
 317         argc -= optind;
 318         argv += optind;
 319         if (argc > 0) {
 320                 fatal("bogus extra arguments");
 321                 /*NOTREACHED*/
 322         }
 323
 324         if (geteuid()) {
 325                 nflag = 1;
 326                 fprintf(stderr, "No kernel update is allowed\n");
 327         }
 328         openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
 329         logopened++;
 330
 331         if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL)
 332                 fatal("malloc");
 333         memset(ripbuf, 0, RIP6_MAXMTU);
 334         ripbuf->rip6_cmd = RIP6_RESPONSE;
 335         ripbuf->rip6_vers = RIP6_VERSION;
 336         ripbuf->rip6_res1[0] = 0;
 337         ripbuf->rip6_res1[1] = 0;
 338
 339         init();
 340         ifconfig();
 341         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
 342                 if (ifcp->ifc_index < 0) {
 343                         fprintf(stderr,
 344 "No ifindex found at %s (no link-local address?)\n",
 345                                 ifcp->ifc_name);
 346                         error++;
 347                 }
 348         }
 349         if (error)
 350                 exit(1);
 351         if (loopifcp == NULL) {
 352                 fatal("No loopback found");
 353                 /*NOTREACHED*/
 354         }
 355         loopifindex = loopifcp->ifc_index;
 356         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
 357                 ifrt(ifcp, 0);
 358         filterconfig();
 359         krtread(0);
 360         if (dflag)
 361                 ifrtdump(0);
 362
 363         if (dflag == 0) {
 364 #if 1
 365                 if (daemon(0, 0) < 0) {
 366                         fatal("daemon");
 367                         /*NOTREACHED*/
 368                 }
 369 #else
 370                 if (fork())
 371                         exit(0);
 372                 if (setsid() < 0) {
 373                         fatal("setid");
 374                         /*NOTREACHED*/
 375                 }
 376 #endif
 377         }
 378         pid = getpid();
 379         if ((pidfile = fopen(ROUTE6D_PID, "w")) != NULL) {
 380                 fprintf(pidfile, "%d\n", pid);
 381                 fclose(pidfile);
 382         }
 383
 384         if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) {
 385                 fatal("malloc");
 386                 /*NOTREACHED*/
 387         }
 388         memset(ripbuf, 0, RIP6_MAXMTU);
 389         ripbuf->rip6_cmd = RIP6_RESPONSE;
 390         ripbuf->rip6_vers = RIP6_VERSION;
 391         ripbuf->rip6_res1[0] = 0;
 392         ripbuf->rip6_res1[1] = 0;
 393
 394         if (signal(SIGALRM, sighandler) == SIG_ERR ||
 395             signal(SIGQUIT, sighandler) == SIG_ERR ||
 396             signal(SIGTERM, sighandler) == SIG_ERR ||
 397             signal(SIGUSR1, sighandler) == SIG_ERR ||
 398             signal(SIGHUP, sighandler) == SIG_ERR ||
 399             signal(SIGINT, sighandler) == SIG_ERR) {
 400                 fatal("signal");
 401                 /*NOTREACHED*/
 402         }
 403         /*
 404          * To avoid rip packet congestion (not on a cable but in this
 405          * process), wait for a moment to send the first RIP6_RESPONSE
 406          * packets.
 407          */
 408         alarm(ripinterval(INIT_INTERVAL6));
 409
 410         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
 411                 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
 412                         sendrequest(ifcp);
 413         }
 414
 415         syslog(LOG_INFO, "**** Started ****");
 416         sigemptyset(&mask);
 417         sigaddset(&mask, SIGALRM);
 418         while (1) {
 419                 fd_set  recvec;
 420
 421                 if (seenalrm) {
 422                         ripalarm();
 423                         seenalrm = 0;
 424                         continue;
 425                 }
 426                 if (seenquit) {
 427                         rtdexit();
 428                         seenquit = 0;
 429                         continue;
 430                 }
 431                 if (seenusr1) {
 432                         ifrtdump(SIGUSR1);
 433                         seenusr1 = 0;
 434                         continue;
 435                 }
 436
 437                 FD_COPY(&sockvec, &recvec);
 438                 signo = 0;
 439                 switch (select(FD_SETSIZE, &recvec, 0, 0, 0)) {
 440                 case -1:
 441                         if (errno != EINTR) {
 442                                 fatal("select");
 443                                 /*NOTREACHED*/
 444                         }
 445                         continue;
 446                 case 0:
 447                         continue;
 448                 default:
 449                         if (FD_ISSET(ripsock, &recvec)) {
 450                                 sigprocmask(SIG_BLOCK, &mask, &omask);
 451                                 riprecv();
 452                                 sigprocmask(SIG_SETMASK, &omask, NULL);
 453                         }
 454                         if (FD_ISSET(rtsock, &recvec)) {
 455                                 sigprocmask(SIG_BLOCK, &mask, &omask);
 456                                 rtrecv();
 457                                 sigprocmask(SIG_SETMASK, &omask, NULL);
 458                         }
 459                 }
 460         }
 461 }
 462
 463 static void
 464 sighandler(int sig)
 465 {
 466
 467         signo = sig;
 468         switch (signo) {
 469         case SIGALRM:
 470                 seenalrm++;
 471                 break;
 472         case SIGQUIT:
 473         case SIGTERM:
 474                 seenquit++;
 475                 break;
 476         case SIGUSR1:
 477         case SIGHUP:
 478         case SIGINT:
 479                 seenusr1++;
 480                 break;
 481         }
 482 }
 483
 484 /*
 485  * gracefully exits after resetting sockopts.
 486  */
 487 /* ARGSUSED */
 488 static void
 489 rtdexit(void)
 490 {
 491         struct  riprt *rrt;
 492
 493         alarm(0);
 494         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
 495                 if (rrt->rrt_rflags & RRTF_AGGREGATE) {
 496                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
 497                 }
 498         }
 499         close(ripsock);
 500         close(rtsock);
 501         syslog(LOG_INFO, "**** Terminated ****");
 502         closelog();
 503         exit(1);
 504 }
 505
 506 /*
 507  * Called periodically:
 508  *      1. age out the learned route. remove it if necessary.
 509  *      2. submit RIP6_RESPONSE packets.
 510  * Invoked in every SUPPLY_INTERVAL6 (30) seconds.  I believe we don't have
 511  * to invoke this function in every 1 or 5 or 10 seconds only to age the
 512  * routes more precisely.
 513  */
 514 /* ARGSUSED */
 515 static void
 516 ripalarm(void)
 517 {
 518         struct  ifc *ifcp;
 519         struct  riprt *rrt, *rrt_prev, *rrt_next;
 520         time_t  t_lifetime, t_holddown;
 521
 522         /* age the RIP routes */
 523         rrt_prev = NULL;
 524         t_lifetime = time(NULL) - RIP_LIFETIME;
 525         t_holddown = t_lifetime - RIP_HOLDDOWN;
 526         for (rrt = riprt; rrt; rrt = rrt_next) {
 527                 rrt_next = rrt->rrt_next;
 528
 529                 if (rrt->rrt_t == 0) {
 530                         rrt_prev = rrt;
 531                         continue;
 532                 }
 533                 if (rrt->rrt_t < t_holddown) {
 534                         if (rrt_prev) {
 535                                 rrt_prev->rrt_next = rrt->rrt_next;
 536                         } else {
 537                                 riprt = rrt->rrt_next;
 538                         }
 539                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
 540                         free(rrt);
 541                         continue;
 542                 }
 543                 if (rrt->rrt_t < t_lifetime)
 544                         rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
 545                 rrt_prev = rrt;
 546         }
 547         /* Supply updates */
 548         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
 549                 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
 550                         ripsend(ifcp, &ifcp->ifc_ripsin, 0);
 551         }
 552         alarm(ripinterval(SUPPLY_INTERVAL6));
 553 }
 554
 555 static void
 556 init(void)
 557 {
 558         int     i, int0, int255, error;
 559         struct  addrinfo hints, *res;
 560         char    port[10];
 561
 562         ifc = NULL;
 563         nifc = 0;
 564         nindex2ifc = 0; /*initial guess*/
 565         index2ifc = NULL;
 566         snprintf(port, sizeof(port), "%d", RIP6_PORT);
 567
 568         memset(&hints, 0, sizeof(hints));
 569         hints.ai_family = PF_INET6;
 570         hints.ai_socktype = SOCK_DGRAM;
 571         hints.ai_flags = AI_PASSIVE;
 572         error = getaddrinfo(NULL, port, &hints, &res);
 573         if (error) {
 574                 fatal("%s", gai_strerror(error));
 575                 /*NOTREACHED*/
 576         }
 577         if (res->ai_next) {
 578                 fatal(":: resolved to multiple address");
 579                 /*NOTREACHED*/
 580         }
 581
 582         int0 = 0; int255 = 255;
 583         ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
 584         if (ripsock < 0) {
 585                 fatal("rip socket");
 586                 /*NOTREACHED*/
 587         }
 588         if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) {
 589                 fatal("rip bind");
 590                 /*NOTREACHED*/
 591         }
 592         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
 593             &int255, sizeof(int255)) < 0) {
 594                 fatal("rip IPV6_MULTICAST_HOPS");
 595                 /*NOTREACHED*/
 596         }
 597         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
 598             &int0, sizeof(int0)) < 0) {
 599                 fatal("rip IPV6_MULTICAST_LOOP");
 600                 /*NOTREACHED*/
 601         }
 602
 603         i = 1;
 604 #ifdef IPV6_RECVPKTINFO
 605         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i,
 606             sizeof(i)) < 0) {
 607                 fatal("rip IPV6_RECVPKTINFO");
 608                 /*NOTREACHED*/
 609         }
 610 #else  /* old adv. API */
 611         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, &i,
 612             sizeof(i)) < 0) {
 613                 fatal("rip IPV6_PKTINFO");
 614                 /*NOTREACHED*/
 615         }
 616 #endif
 617
 618         memset(&hints, 0, sizeof(hints));
 619         hints.ai_family = PF_INET6;
 620         hints.ai_socktype = SOCK_DGRAM;
 621         error = getaddrinfo(RIP6_DEST, port, &hints, &res);
 622         if (error) {
 623                 fatal("%s", gai_strerror(error));
 624                 /*NOTREACHED*/
 625         }
 626         if (res->ai_next) {
 627                 fatal("%s resolved to multiple address", RIP6_DEST);
 628                 /*NOTREACHED*/
 629         }
 630         memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
 631
 632 #ifdef FD_ZERO
 633         FD_ZERO(&sockvec);
 634 #else
 635         memset(&sockvec, 0, sizeof(sockvec));
 636 #endif
 637         FD_SET(ripsock, &sockvec);
 638
 639         if (nflag == 0) {
 640                 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
 641                         fatal("route socket");
 642                         /*NOTREACHED*/
 643                 }
 644                 FD_SET(rtsock, &sockvec);
 645         } else
 646                 rtsock = -1;    /*just for safety */
 647 }
 648
 649 #define RIPSIZE(n) \
 650         (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6))
 651
 652 /*
 653  * ripflush flushes the rip datagram stored in the rip buffer
 654  */
 655 static int nrt;
 656 static struct netinfo6 *np;
 657
 658 static void
 659 ripflush(struct ifc *ifcp, struct sockaddr_in6 *sin)
 660 {
 661         int i;
 662         int error;
 663
 664         if (ifcp)
 665                 tracet(1, "Send(%s): info(%d) to %s.%d\n",
 666                         ifcp->ifc_name, nrt,
 667                         inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port));
 668         else
 669                 tracet(1, "Send: info(%d) to %s.%d\n",
 670                         nrt, inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port));
 671         if (dflag >= 2) {
 672                 np = ripbuf->rip6_nets;
 673                 for (i = 0; i < nrt; i++, np++) {
 674                         if (np->rip6_metric == NEXTHOP_METRIC) {
 675                                 if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest))
 676                                         trace(2, "    NextHop reset");
 677                                 else {
 678                                         trace(2, "    NextHop %s",
 679                                                 inet6_n2p(&np->rip6_dest));
 680                                 }
 681                         } else {
 682                                 trace(2, "    %s/%d[%d]",
 683                                         inet6_n2p(&np->rip6_dest),
 684                                         np->rip6_plen, np->rip6_metric);
 685                         }
 686                         if (np->rip6_tag) {
 687                                 trace(2, "  tag=0x%04x",
 688                                         ntohs(np->rip6_tag) & 0xffff);
 689                         }
 690                         trace(2, "\n");
 691                 }
 692         }
 693         error = sendpacket(sin, RIPSIZE(nrt));
 694         if (error == EAFNOSUPPORT) {
 695                 /* Protocol not supported */
 696                 tracet(1, "Could not send info to %s (%s): "
 697                         "set IFF_UP to 0\n",
 698                         ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
 699                 ifcp->ifc_flags &= ~IFF_UP;     /* As if down for AF_INET6 */
 700         }
 701         nrt = 0; np = ripbuf->rip6_nets;
 702 }
 703
 704 /*
 705  * Generate RIP6_RESPONSE packets and send them.
 706  */
 707 static void
 708 ripsend(struct ifc *ifcp, struct sockaddr_in6 *sin, int flag)
 709 {
 710         struct  riprt *rrt;
 711         struct  in6_addr *nh;   /* next hop */
 712         int     maxrte;
 713
 714         if (ifcp == NULL) {
 715                 /*
 716                  * Request from non-link local address is not
 717                  * a regular route6d update.
 718                  */
 719                 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) -
 720                                 sizeof(struct udphdr) -
 721                                 sizeof(struct rip6) + sizeof(struct netinfo6)) /
 722                                 sizeof(struct netinfo6);
 723                 nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
 724                 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
 725                         if (rrt->rrt_rflags & RRTF_NOADVERTISE)
 726                                 continue;
 727                         /* Put the route to the buffer */
 728                         *np = rrt->rrt_info;
 729                         np++; nrt++;
 730                         if (nrt == maxrte) {
 731                                 ripflush(NULL, sin);
 732                                 nh = NULL;
 733                         }
 734                 }
 735                 if (nrt)        /* Send last packet */
 736                         ripflush(NULL, sin);
 737                 return;
 738         }
 739
 740         if ((flag & RRTF_SENDANYWAY) == 0 &&
 741             (qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
 742                 return;
 743
 744         /* -N: no use */
 745         if (iff_find(ifcp, 'N') != NULL)
 746                 return;
 747
 748         /* -T: generate default route only */
 749         if (iff_find(ifcp, 'T') != NULL) {
 750                 struct netinfo6 rrt_info;
 751                 memset(&rrt_info, 0, sizeof(struct netinfo6));
 752                 rrt_info.rip6_dest = in6addr_any;
 753                 rrt_info.rip6_plen = 0;
 754                 rrt_info.rip6_metric = 1;
 755                 rrt_info.rip6_metric += ifcp->ifc_metric;
 756                 rrt_info.rip6_tag = htons(routetag & 0xffff);
 757                 np = ripbuf->rip6_nets;
 758                 *np = rrt_info;
 759                 nrt = 1;
 760                 ripflush(ifcp, sin);
 761                 return;
 762         }
 763
 764         maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) -
 765                         sizeof(struct udphdr) -
 766                         sizeof(struct rip6) + sizeof(struct netinfo6)) /
 767                         sizeof(struct netinfo6);
 768
 769         nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
 770         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
 771                 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
 772                         continue;
 773
 774                 /* Need to check filter here */
 775                 if (out_filter(rrt, ifcp) == 0)
 776                         continue;
 777
 778                 /* Check split horizon and other conditions */
 779                 if (tobeadv(rrt, ifcp) == 0)
 780                         continue;
 781
 782                 /* Only considers the routes with flag if specified */
 783                 if ((flag & RRTF_CHANGED) &&
 784                     (rrt->rrt_rflags & RRTF_CHANGED) == 0)
 785                         continue;
 786
 787                 /* Check nexthop */
 788                 if (rrt->rrt_index == ifcp->ifc_index &&
 789                     !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) &&
 790                     (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) {
 791                         if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) {
 792                                 if (nrt == maxrte - 2)
 793                                         ripflush(ifcp, sin);
 794                                 np->rip6_dest = rrt->rrt_gw;
 795                                 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest))
 796                                         SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0);
 797                                 np->rip6_plen = 0;
 798                                 np->rip6_tag = 0;
 799                                 np->rip6_metric = NEXTHOP_METRIC;
 800                                 nh = &rrt->rrt_gw;
 801                                 np++; nrt++;
 802                         }
 803                 } else if (nh && (rrt->rrt_index != ifcp->ifc_index ||
 804                                   !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) ||
 805                                   rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) {
 806                         /* Reset nexthop */
 807                         if (nrt == maxrte - 2)
 808                                 ripflush(ifcp, sin);
 809                         memset(np, 0, sizeof(struct netinfo6));
 810                         np->rip6_metric = NEXTHOP_METRIC;
 811                         nh = NULL;
 812                         np++; nrt++;
 813                 }
 814
 815                 /* Put the route to the buffer */
 816                 *np = rrt->rrt_info;
 817                 np++; nrt++;
 818                 if (nrt == maxrte) {
 819                         ripflush(ifcp, sin);
 820                         nh = NULL;
 821                 }
 822         }
 823         if (nrt)        /* Send last packet */
 824                 ripflush(ifcp, sin);
 825 }
 826
 827 /*
 828  * outbound filter logic, per-route/interface.
 829  */
 830 static int
 831 out_filter(struct riprt *rrt, struct ifc *ifcp)
 832 {
 833         struct iff *iffp;
 834         struct in6_addr ia;
 835         int ok;
 836
 837         /*
 838          * -A: filter out less specific routes, if we have aggregated
 839          * route configured.
 840          */
 841         for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
 842                 if (iffp->iff_type != 'A')
 843                         continue;
 844                 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen)
 845                         continue;
 846                 ia = rrt->rrt_info.rip6_dest;
 847                 applyplen(&ia, iffp->iff_plen);
 848                 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr))
 849                         return 0;
 850         }
 851
 852         /*
 853          * if it is an aggregated route, advertise it only to the
 854          * interfaces specified on -A.
 855          */
 856         if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) {
 857                 ok = 0;
 858                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
 859                         if (iffp->iff_type != 'A')
 860                                 continue;
 861                         if (rrt->rrt_info.rip6_plen == iffp->iff_plen &&
 862                             IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
 863                             &iffp->iff_addr)) {
 864                                 ok = 1;
 865                                 break;
 866                         }
 867                 }
 868                 if (!ok)
 869                         return 0;
 870         }
 871
 872         /*
 873          * -O: advertise only if prefix matches the configured prefix.
 874          */
 875         if (iff_find(ifcp, 'O')) {
 876                 ok = 0;
 877                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
 878                         if (iffp->iff_type != 'O')
 879                                 continue;
 880                         if (rrt->rrt_info.rip6_plen < iffp->iff_plen)
 881                                 continue;
 882                         ia = rrt->rrt_info.rip6_dest;
 883                         applyplen(&ia, iffp->iff_plen);
 884                         if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
 885                                 ok = 1;
 886                                 break;
 887                         }
 888                 }
 889                 if (!ok)
 890                         return 0;
 891         }
 892
 893         /* the prefix should be advertised */
 894         return 1;
 895 }
 896
 897 /*
 898  * Determine if the route is to be advertised on the specified interface.
 899  * It checks options specified in the arguments and the split horizon rule.
 900  */
 901 static int
 902 tobeadv(struct riprt *rrt, struct ifc *ifcp)
 903 {
 904
 905         /* Special care for static routes */
 906         if (rrt->rrt_flags & RTF_STATIC) {
 907                 /* XXX don't advertise reject/blackhole routes */
 908                 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE))
 909                         return 0;
 910
 911                 if (Sflag)      /* Yes, advertise it anyway */
 912                         return 1;
 913                 if (sflag && rrt->rrt_index != ifcp->ifc_index)
 914                         return 1;
 915                 return 0;
 916         }
 917         /* Regular split horizon */
 918         if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index)
 919                 return 0;
 920         return 1;
 921 }
 922
 923 /*
 924  * Send a rip packet actually.
 925  */
 926 static int
 927 sendpacket(struct sockaddr_in6 *sin, int len)
 928 {
 929         /*
 930          * MSG_DONTROUTE should not be specified when it responds with a
 931          * RIP6_REQUEST message.  SO_DONTROUTE has been specified to
 932          * other sockets.
 933          */
 934         struct msghdr m;
 935         struct cmsghdr *cm;
 936         struct iovec iov[2];
 937         u_char cmsgbuf[256];
 938         struct in6_pktinfo *pi;
 939         int idx;
 940         struct sockaddr_in6 sincopy;
 941
 942         /* do not overwrite the given sin */
 943         sincopy = *sin;
 944         sin = &sincopy;
 945
 946         if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr)
 947          || IN6_IS_ADDR_MULTICAST(&sin->sin6_addr)) {
 948                 idx = IN6_LINKLOCAL_IFINDEX(sin->sin6_addr);
 949                 SET_IN6_LINKLOCAL_IFINDEX(sin->sin6_addr, 0);
 950         } else
 951                 idx = 0;
 952
 953         m.msg_name = (caddr_t)sin;
 954         m.msg_namelen = sizeof(*sin);
 955         iov[0].iov_base = (caddr_t)ripbuf;
 956         iov[0].iov_len = len;
 957         m.msg_iov = iov;
 958         m.msg_iovlen = 1;
 959         if (!idx) {
 960                 m.msg_control = NULL;
 961                 m.msg_controllen = 0;
 962         } else {
 963                 memset(cmsgbuf, 0, sizeof(cmsgbuf));
 964                 cm = (struct cmsghdr *)cmsgbuf;
 965                 m.msg_control = (caddr_t)cm;
 966                 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
 967
 968                 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
 969                 cm->cmsg_level = IPPROTO_IPV6;
 970                 cm->cmsg_type = IPV6_PKTINFO;
 971                 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
 972                 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/
 973                 pi->ipi6_ifindex = idx;
 974         }
 975
 976         if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) {
 977                 trace(1, "sendmsg: %s\n", strerror(errno));
 978                 return errno;
 979         }
 980
 981         return 0;
 982 }
 983
 984 /*
 985  * Receive and process RIP packets.  Update the routes/kernel forwarding
 986  * table if necessary.
 987  */
 988 static void
 989 riprecv(void)
 990 {
 991         struct  ifc *ifcp, *ic;
 992         struct  sockaddr_in6 fsock;
 993         struct  in6_addr nh;    /* next hop */
 994         struct  rip6 *rp;
 995         struct  netinfo6 *np, *nq;
 996         struct  riprt *rrt;
 997         int     len, nn, need_trigger, idx;
 998         char    buf[4 * RIP6_MAXMTU];
 999         time_t  t;
1000         struct msghdr m;
1001         struct cmsghdr *cm;
1002         struct iovec iov[2];
1003         u_char cmsgbuf[256];
1004         struct in6_pktinfo *pi;
1005         struct iff *iffp;
1006         struct in6_addr ia;
1007         int ok;
1008         time_t t_half_lifetime;
1009
1010         need_trigger = 0;
1011
1012         m.msg_name = (caddr_t)&fsock;
1013         m.msg_namelen = sizeof(fsock);
1014         iov[0].iov_base = (caddr_t)buf;
1015         iov[0].iov_len = sizeof(buf);
1016         m.msg_iov = iov;
1017         m.msg_iovlen = 1;
1018         cm = (struct cmsghdr *)cmsgbuf;
1019         m.msg_control = (caddr_t)cm;
1020         m.msg_controllen = sizeof(cmsgbuf);
1021         if ((len = recvmsg(ripsock, &m, 0)) < 0) {
1022                 fatal("recvmsg");
1023                 /*NOTREACHED*/
1024         }
1025         idx = 0;
1026         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
1027              cm;
1028              cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
1029                 if (cm->cmsg_level == IPPROTO_IPV6 &&
1030                     cm->cmsg_type == IPV6_PKTINFO) {
1031                         pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
1032                         idx = pi->ipi6_ifindex;
1033                         break;
1034                 }
1035         }
1036         if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr))
1037                 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx);
1038
1039         nh = fsock.sin6_addr;
1040         nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) /
1041                 sizeof(struct netinfo6);
1042         rp = (struct rip6 *)buf;
1043         np = rp->rip6_nets;
1044
1045         if (rp->rip6_vers !=  RIP6_VERSION) {
1046                 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers);
1047                 return;
1048         }
1049         if (rp->rip6_cmd == RIP6_REQUEST) {
1050                 if (idx && idx < nindex2ifc) {
1051                         ifcp = index2ifc[idx];
1052                         riprequest(ifcp, np, nn, &fsock);
1053                 } else {
1054                         riprequest(NULL, np, nn, &fsock);
1055                 }
1056                 return;
1057         }
1058
1059         if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) {
1060                 trace(1, "Packets from non-ll addr: %s\n",
1061                     inet6_n2p(&fsock.sin6_addr));
1062                 return;         /* Ignore packets from non-link-local addr */
1063         }
1064         idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr);
1065         ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL;
1066         if (!ifcp) {
1067                 trace(1, "Packets to unknown interface index %d\n", idx);
1068                 return;         /* Ignore it */
1069         }
1070         if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr))
1071                 return;         /* The packet is from me; ignore */
1072         if (rp->rip6_cmd != RIP6_RESPONSE) {
1073                 trace(1, "Invalid command %d\n", rp->rip6_cmd);
1074                 return;
1075         }
1076
1077         /* -N: no use */
1078         if (iff_find(ifcp, 'N') != NULL)
1079                 return;
1080
1081         tracet(1, "Recv(%s): from %s.%d info(%d)\n",
1082             ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn);
1083
1084         t = time(NULL);
1085         t_half_lifetime = t - (RIP_LIFETIME/2);
1086         for (; nn; nn--, np++) {
1087                 if (np->rip6_metric == NEXTHOP_METRIC) {
1088                         /* modify neighbor address */
1089                         if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1090                                 nh = np->rip6_dest;
1091                                 SET_IN6_LINKLOCAL_IFINDEX(nh, idx);
1092                                 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1093                         } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) {
1094                                 nh = fsock.sin6_addr;
1095                                 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1096                         } else {
1097                                 nh = fsock.sin6_addr;
1098                                 trace(1, "\tInvalid Nexthop: %s\n",
1099                                     inet6_n2p(&np->rip6_dest));
1100                         }
1101                         continue;
1102                 }
1103                 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) {
1104                         trace(1, "\tMulticast netinfo6: %s/%d [%d]\n",
1105                                 inet6_n2p(&np->rip6_dest),
1106                                 np->rip6_plen, np->rip6_metric);
1107                         continue;
1108                 }
1109                 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) {
1110                         trace(1, "\tLoopback netinfo6: %s/%d [%d]\n",
1111                                 inet6_n2p(&np->rip6_dest),
1112                                 np->rip6_plen, np->rip6_metric);
1113                         continue;
1114                 }
1115                 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1116                         trace(1, "\tLink Local netinfo6: %s/%d [%d]\n",
1117                                 inet6_n2p(&np->rip6_dest),
1118                                 np->rip6_plen, np->rip6_metric);
1119                         continue;
1120                 }
1121                 /* may need to pass sitelocal prefix in some case, however*/
1122                 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) {
1123                         trace(1, "\tSite Local netinfo6: %s/%d [%d]\n",
1124                                 inet6_n2p(&np->rip6_dest),
1125                                 np->rip6_plen, np->rip6_metric);
1126                         continue;
1127                 }
1128                 trace(2, "\tnetinfo6: %s/%d [%d]",
1129                         inet6_n2p(&np->rip6_dest),
1130                         np->rip6_plen, np->rip6_metric);
1131                 if (np->rip6_tag)
1132                         trace(2, "  tag=0x%04x", ntohs(np->rip6_tag) & 0xffff);
1133                 if (dflag >= 2) {
1134                         ia = np->rip6_dest;
1135                         applyplen(&ia, np->rip6_plen);
1136                         if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest))
1137                                 trace(2, " [junk outside prefix]");
1138                 }
1139
1140                 /*
1141                  * -L: listen only if the prefix matches the configuration
1142                  */
1143                 ok = 1;         /* if there's no L filter, it is ok */
1144                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
1145                         if (iffp->iff_type != 'L')
1146                                 continue;
1147                         ok = 0;
1148                         if (np->rip6_plen < iffp->iff_plen)
1149                                 continue;
1150                         /* special rule: ::/0 means default, not "in /0" */
1151                         if (iffp->iff_plen == 0 && np->rip6_plen > 0)
1152                                 continue;
1153                         ia = np->rip6_dest;
1154                         applyplen(&ia, iffp->iff_plen);
1155                         if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
1156                                 ok = 1;
1157                                 break;
1158                         }
1159                 }
1160                 if (!ok) {
1161                         trace(2, "  (filtered)\n");
1162                         continue;
1163                 }
1164
1165                 trace(2, "\n");
1166                 np->rip6_metric++;
1167                 np->rip6_metric += ifcp->ifc_metric;
1168                 if (np->rip6_metric > HOPCNT_INFINITY6)
1169                         np->rip6_metric = HOPCNT_INFINITY6;
1170
1171                 applyplen(&np->rip6_dest, np->rip6_plen);
1172                 if ((rrt = rtsearch(np, NULL)) != NULL) {
1173                         if (rrt->rrt_t == 0)
1174                                 continue;       /* Intf route has priority */
1175                         nq = &rrt->rrt_info;
1176                         if (nq->rip6_metric > np->rip6_metric) {
1177                                 if (rrt->rrt_index == ifcp->ifc_index &&
1178                                     IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1179                                         /* Small metric from the same gateway */
1180                                         nq->rip6_metric = np->rip6_metric;
1181                                 } else {
1182                                         /* Better route found */
1183                                         rrt->rrt_index = ifcp->ifc_index;
1184                                         /* Update routing table */
1185                                         delroute(nq, &rrt->rrt_gw);
1186                                         rrt->rrt_gw = nh;
1187                                         *nq = *np;
1188                                         addroute(rrt, &nh, ifcp);
1189                                 }
1190                                 rrt->rrt_rflags |= RRTF_CHANGED;
1191                                 rrt->rrt_t = t;
1192                                 need_trigger = 1;
1193                         } else if (nq->rip6_metric < np->rip6_metric &&
1194                                    rrt->rrt_index == ifcp->ifc_index &&
1195                                    IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1196                                 /* Got worse route from same gw */
1197                                 nq->rip6_metric = np->rip6_metric;
1198                                 rrt->rrt_t = t;
1199                                 rrt->rrt_rflags |= RRTF_CHANGED;
1200                                 need_trigger = 1;
1201                         } else if (nq->rip6_metric == np->rip6_metric &&
1202                                    np->rip6_metric < HOPCNT_INFINITY6) {
1203                                 if (rrt->rrt_index == ifcp->ifc_index &&
1204                                    IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1205                                         /* same metric, same route from same gw */
1206                                         rrt->rrt_t = t;
1207                                 } else if (rrt->rrt_t < t_half_lifetime) {
1208                                         /* Better route found */
1209                                         rrt->rrt_index = ifcp->ifc_index;
1210                                         /* Update routing table */
1211                                         delroute(nq, &rrt->rrt_gw);
1212                                         rrt->rrt_gw = nh;
1213                                         *nq = *np;
1214                                         addroute(rrt, &nh, ifcp);
1215                                         rrt->rrt_rflags |= RRTF_CHANGED;
1216                                         rrt->rrt_t = t;
1217                                 }
1218                         }
1219                         /*
1220                          * if nq->rip6_metric == HOPCNT_INFINITY6 then
1221                          * do not update age value.  Do nothing.
1222                          */
1223                 } else if (np->rip6_metric < HOPCNT_INFINITY6) {
1224                         /* Got a new valid route */
1225                         if ((rrt = MALLOC(struct riprt)) == NULL) {
1226                                 fatal("malloc: struct riprt");
1227                                 /*NOTREACHED*/
1228                         }
1229                         memset(rrt, 0, sizeof(*rrt));
1230                         nq = &rrt->rrt_info;
1231
1232                         rrt->rrt_same = NULL;
1233                         rrt->rrt_index = ifcp->ifc_index;
1234                         rrt->rrt_flags = RTF_UP|RTF_GATEWAY;
1235                         rrt->rrt_gw = nh;
1236                         *nq = *np;
1237                         applyplen(&nq->rip6_dest, nq->rip6_plen);
1238                         if (nq->rip6_plen == sizeof(struct in6_addr) * 8)
1239                                 rrt->rrt_flags |= RTF_HOST;
1240
1241                         /* Put the route to the list */
1242                         rrt->rrt_next = riprt;
1243                         riprt = rrt;
1244                         /* Update routing table */
1245                         addroute(rrt, &nh, ifcp);
1246                         rrt->rrt_rflags |= RRTF_CHANGED;
1247                         need_trigger = 1;
1248                         rrt->rrt_t = t;
1249                 }
1250         }
1251         /* XXX need to care the interval between triggered updates */
1252         if (need_trigger) {
1253                 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) {
1254                         for (ic = ifc; ic; ic = ic->ifc_next) {
1255                                 if (ifcp->ifc_index == ic->ifc_index)
1256                                         continue;
1257                                 if (ic->ifc_flags & IFF_UP)
1258                                         ripsend(ic, &ic->ifc_ripsin,
1259                                                 RRTF_CHANGED);
1260                         }
1261                 }
1262                 /* Reset the flag */
1263                 for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1264                         rrt->rrt_rflags &= ~RRTF_CHANGED;
1265         }
1266 }
1267
1268 /*
1269  * Send all routes request packet to the specified interface.
1270  */
1271 static void
1272 sendrequest(struct ifc *ifcp)
1273 {
1274         struct netinfo6 *np;
1275         int error;
1276
1277         if (ifcp->ifc_flags & IFF_LOOPBACK)
1278                 return;
1279         ripbuf->rip6_cmd = RIP6_REQUEST;
1280         np = ripbuf->rip6_nets;
1281         memset(np, 0, sizeof(struct netinfo6));
1282         np->rip6_metric = HOPCNT_INFINITY6;
1283         tracet(1, "Send rtdump Request to %s (%s)\n",
1284                 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1285         error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
1286         if (error == EAFNOSUPPORT) {
1287                 /* Protocol not supported */
1288                 tracet(1, "Could not send rtdump Request to %s (%s): "
1289                         "set IFF_UP to 0\n",
1290                         ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1291                 ifcp->ifc_flags &= ~IFF_UP;     /* As if down for AF_INET6 */
1292         }
1293         ripbuf->rip6_cmd = RIP6_RESPONSE;
1294 }
1295
1296 /*
1297  * Process a RIP6_REQUEST packet.
1298  */
1299 static void
1300 riprequest(struct ifc *ifcp, struct netinfo6 *np, int nn,
1301            struct sockaddr_in6 *sin)
1302 {
1303         int i;
1304         struct riprt *rrt;
1305
1306         if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) &&
1307               np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) {
1308                 /* Specific response, don't split-horizon */
1309                 trace(1, "\tRIP Request\n");
1310                 for (i = 0; i < nn; i++, np++) {
1311                         rrt = rtsearch(np, NULL);
1312                         if (rrt)
1313                                 np->rip6_metric = rrt->rrt_info.rip6_metric;
1314                         else
1315                                 np->rip6_metric = HOPCNT_INFINITY6;
1316                 }
1317                 sendpacket(sin, RIPSIZE(nn));
1318                 return;
1319         }
1320         /* Whole routing table dump */
1321         trace(1, "\tRIP Request -- whole routing table\n");
1322         ripsend(ifcp, sin, RRTF_SENDANYWAY);
1323 }
1324
1325 /*
1326  * Get information of each interface.
1327  */
1328 static void
1329 ifconfig(void)
1330 {
1331         struct ifaddrs *ifap, *ifa;
1332         struct ifc *ifcp;
1333         struct ipv6_mreq mreq;
1334         int s;
1335
1336         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
1337                 fatal("socket");
1338                 /*NOTREACHED*/
1339         }
1340
1341         if (getifaddrs(&ifap) != 0) {
1342                 fatal("getifaddrs");
1343                 /*NOTREACHED*/
1344         }
1345
1346         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1347                 if (ifa->ifa_addr->sa_family != AF_INET6)
1348                         continue;
1349                 ifcp = ifc_find(ifa->ifa_name);
1350                 /* we are interested in multicast-capable interfaces */
1351                 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
1352                         continue;
1353                 if (!ifcp) {
1354                         /* new interface */
1355                         if ((ifcp = MALLOC(struct ifc)) == NULL) {
1356                                 fatal("malloc: struct ifc");
1357                                 /*NOTREACHED*/
1358                         }
1359                         memset(ifcp, 0, sizeof(*ifcp));
1360                         ifcp->ifc_index = -1;
1361                         ifcp->ifc_next = ifc;
1362                         ifc = ifcp;
1363                         nifc++;
1364                         ifcp->ifc_name = allocopy(ifa->ifa_name);
1365                         ifcp->ifc_addr = NULL;
1366                         ifcp->ifc_filter = NULL;
1367                         ifcp->ifc_flags = ifa->ifa_flags;
1368                         trace(1, "newif %s <%s>\n", ifcp->ifc_name,
1369                                 ifflags(ifcp->ifc_flags));
1370                         if (!strcmp(ifcp->ifc_name, LOOPBACK_IF))
1371                                 loopifcp = ifcp;
1372                 } else {
1373                         /* update flag, this may be up again */
1374                         if (ifcp->ifc_flags != ifa->ifa_flags) {
1375                                 trace(1, "%s: <%s> -> ", ifcp->ifc_name,
1376                                         ifflags(ifcp->ifc_flags));
1377                                 trace(1, "<%s>\n", ifflags(ifa->ifa_flags));
1378                                 ifcp->ifc_cflags |= IFC_CHANGED;
1379                         }
1380                         ifcp->ifc_flags = ifa->ifa_flags;
1381                 }
1382                 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s);
1383                 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP
1384                  && 0 < ifcp->ifc_index && !ifcp->ifc_joined) {
1385                         mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr;
1386                         mreq.ipv6mr_interface = ifcp->ifc_index;
1387                         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1388                             &mreq, sizeof(mreq)) < 0) {
1389                                 fatal("IPV6_JOIN_GROUP");
1390                                 /*NOTREACHED*/
1391                         }
1392                         trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST);
1393                         ifcp->ifc_joined++;
1394                 }
1395         }
1396         close(s);
1397         freeifaddrs(ifap);
1398 }
1399
1400 static void
1401 ifconfig1(const char *name, const struct sockaddr *sa, struct ifc *ifcp, int s)
1402 {
1403         struct  in6_ifreq ifr;
1404         const struct sockaddr_in6 *sin;
1405         struct  ifac *ifa;
1406         int     plen;
1407         char    buf[BUFSIZ];
1408
1409         sin = (const struct sockaddr_in6 *)sa;
1410         ifr.ifr_addr = *sin;
1411         strcpy(ifr.ifr_name, name);
1412         if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) {
1413                 fatal("ioctl: SIOCGIFNETMASK_IN6");
1414                 /*NOTREACHED*/
1415         }
1416         plen = sin6mask2len(&ifr.ifr_addr);
1417         if ((ifa = ifa_match(ifcp, &sin->sin6_addr, plen)) != NULL) {
1418                 /* same interface found */
1419                 /* need check if something changed */
1420                 /* XXX not yet implemented */
1421                 return;
1422         }
1423         /*
1424          * New address is found
1425          */
1426         if ((ifa = MALLOC(struct ifac)) == NULL) {
1427                 fatal("malloc: struct ifac");
1428                 /*NOTREACHED*/
1429         }
1430         memset(ifa, 0, sizeof(*ifa));
1431         ifa->ifa_conf = ifcp;
1432         ifa->ifa_next = ifcp->ifc_addr;
1433         ifcp->ifc_addr = ifa;
1434         ifa->ifa_addr = sin->sin6_addr;
1435         ifa->ifa_plen = plen;
1436         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1437                 ifr.ifr_addr = *sin;
1438                 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) {
1439                         fatal("ioctl: SIOCGIFDSTADDR_IN6");
1440                         /*NOTREACHED*/
1441                 }
1442                 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr;
1443                 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf));
1444                 trace(1, "found address %s/%d -- %s\n",
1445                         inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf);
1446         } else {
1447                 trace(1, "found address %s/%d\n",
1448                         inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen);
1449         }
1450         if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1451                 ifcp->ifc_mylladdr = ifa->ifa_addr;
1452                 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr);
1453                 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len);
1454                 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr,
1455                         ifcp->ifc_index);
1456                 setindex2ifc(ifcp->ifc_index, ifcp);
1457                 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index);
1458                 if (ifcp->ifc_mtu > RIP6_MAXMTU)
1459                         ifcp->ifc_mtu = RIP6_MAXMTU;
1460                 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) {
1461                         fatal("ioctl: SIOCGIFMETRIC");
1462                         /*NOTREACHED*/
1463                 }
1464                 ifcp->ifc_metric = ifr.ifr_metric;
1465                 trace(1, "\tindex: %d, mtu: %d, metric: %d\n",
1466                         ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric);
1467         } else
1468                 ifcp->ifc_cflags |= IFC_CHANGED;
1469 }
1470
1471 /*
1472  * Receive and process routing messages.
1473  * Update interface information as necesssary.
1474  */
1475 static void
1476 rtrecv(void)
1477 {
1478         char buf[BUFSIZ];
1479         char *p, *q;
1480         struct rt_msghdr *rtm;
1481         struct ifa_msghdr *ifam;
1482         struct if_msghdr *ifm;
1483         int len;
1484         struct ifc *ifcp, *ic;
1485         int iface = 0, rtable = 0;
1486         struct sockaddr_in6 *rta[RTAX_MAX];
1487         struct sockaddr_in6 mask;
1488         int i, addrs;
1489         struct riprt *rrt;
1490
1491         if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
1492                 perror("read from rtsock");
1493                 exit(1);
1494         }
1495         if (len < sizeof(*rtm)) {
1496                 trace(1, "short read from rtsock: %d (should be > %lu)\n",
1497                         len, (u_long)sizeof(*rtm));
1498                 return;
1499         }
1500
1501         for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) {
1502                 /* safety against bogus message */
1503                 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) {
1504                         trace(1, "bogus rtmsg: length=%d\n",
1505                                 ((struct rt_msghdr *)p)->rtm_msglen);
1506                         break;
1507                 }
1508                 rtm = NULL;
1509                 ifam = NULL;
1510                 ifm = NULL;
1511                 switch (((struct rt_msghdr *)p)->rtm_type) {
1512                 case RTM_NEWADDR:
1513                 case RTM_DELADDR:
1514                         ifam = (struct ifa_msghdr *)p;
1515                         addrs = ifam->ifam_addrs;
1516                         q = (char *)(ifam + 1);
1517                         break;
1518                 case RTM_IFINFO:
1519                         ifm = (struct if_msghdr *)p;
1520                         addrs = ifm->ifm_addrs;
1521                         q = (char *)(ifm + 1);
1522                         break;
1523                 default:
1524                         rtm = (struct rt_msghdr *)p;
1525                         addrs = rtm->rtm_addrs;
1526                         q = (char *)(rtm + 1);
1527                         if (rtm->rtm_version != RTM_VERSION) {
1528                                 trace(1, "unexpected rtmsg version %d "
1529                                         "(should be %d)\n",
1530                                         rtm->rtm_version, RTM_VERSION);
1531                                 continue;
1532                         }
1533                         if (rtm->rtm_pid == pid) {
1534 #if 0
1535                                 trace(1, "rtmsg looped back to me, ignored\n");
1536 #endif
1537                                 continue;
1538                         }
1539                         break;
1540                 }
1541                 memset(&rta, 0, sizeof(rta));
1542                 for (i = 0; i < RTAX_MAX; i++) {
1543                         if (addrs & (1 << i)) {
1544                                 rta[i] = (struct sockaddr_in6 *)q;
1545                                 q += RT_ROUNDUP(rta[i]->sin6_len);
1546                         }
1547                 }
1548
1549                 trace(1, "rtsock: %s (addrs=%x)\n",
1550                         rttypes((struct rt_msghdr *)p), addrs);
1551                 if (dflag >= 2) {
1552                         for (i = 0;
1553                              i < ((struct rt_msghdr *)p)->rtm_msglen;
1554                              i++) {
1555                                 fprintf(stderr, "%02x ", p[i] & 0xff);
1556                                 if (i % 16 == 15) fprintf(stderr, "\n");
1557                         }
1558                         fprintf(stderr, "\n");
1559                 }
1560
1561                 /*
1562                  * Easy ones first.
1563                  *
1564                  * We may be able to optimize by using ifm->ifm_index or
1565                  * ifam->ifam_index.  For simplicity we don't do that here.
1566                  */
1567                 switch (((struct rt_msghdr *)p)->rtm_type) {
1568                 case RTM_NEWADDR:
1569                 case RTM_IFINFO:
1570                         iface++;
1571                         continue;
1572                 case RTM_ADD:
1573                         rtable++;
1574                         continue;
1575                 case RTM_LOSING:
1576                 case RTM_MISS:
1577                 case RTM_RESOLVE:
1578                 case RTM_GET:
1579                 case RTM_LOCK:
1580                         /* nothing to be done here */
1581                         trace(1, "\tnothing to be done, ignored\n");
1582                         continue;
1583                 }
1584
1585 #if 0
1586                 if (rta[RTAX_DST] == NULL) {
1587                         trace(1, "\tno destination, ignored\n");
1588                         continue;
1589                 }
1590                 if (rta[RTAX_DST]->sin6_family != AF_INET6) {
1591                         trace(1, "\taf mismatch, ignored\n");
1592                         continue;
1593                 }
1594                 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) {
1595                         trace(1, "\tlinklocal destination, ignored\n");
1596                         continue;
1597                 }
1598                 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) {
1599                         trace(1, "\tloopback destination, ignored\n");
1600                         continue;               /* Loopback */
1601                 }
1602                 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) {
1603                         trace(1, "\tmulticast destination, ignored\n");
1604                         continue;
1605                 }
1606 #endif
1607
1608                 /* hard ones */
1609                 switch (((struct rt_msghdr *)p)->rtm_type) {
1610                 case RTM_NEWADDR:
1611                 case RTM_IFINFO:
1612                 case RTM_ADD:
1613                 case RTM_LOSING:
1614                 case RTM_MISS:
1615                 case RTM_RESOLVE:
1616                 case RTM_GET:
1617                 case RTM_LOCK:
1618                         /* should already be handled */
1619                         fatal("rtrecv: never reach here");
1620                         /*NOTREACHED*/
1621                 case RTM_DELETE:
1622                         if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) {
1623                                 trace(1, "\tsome of dst/gw/netamsk are "
1624                                     "unavailable, ignored\n");
1625                                 break;
1626                         }
1627                         if ((rtm->rtm_flags & RTF_HOST) != 0) {
1628                                 mask.sin6_len = sizeof(mask);
1629                                 memset(&mask.sin6_addr, 0xff,
1630                                     sizeof(mask.sin6_addr));
1631                                 rta[RTAX_NETMASK] = &mask;
1632                         } else if (!rta[RTAX_NETMASK]) {
1633                                 trace(1, "\tsome of dst/gw/netamsk are "
1634                                     "unavailable, ignored\n");
1635                                 break;
1636                         }
1637                         if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY],
1638                             rta[RTAX_NETMASK]) == 0) {
1639                                 rtable++;       /*just to be sure*/
1640                         }
1641                         break;
1642                 case RTM_CHANGE:
1643                 case RTM_REDIRECT:
1644                         trace(1, "\tnot supported yet, ignored\n");
1645                         break;
1646                 case RTM_DELADDR:
1647                         if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) {
1648                                 trace(1, "\tno netmask or ifa given, ignored\n");
1649                                 break;
1650                         }
1651                         if (ifam->ifam_index < nindex2ifc)
1652                                 ifcp = index2ifc[ifam->ifam_index];
1653                         else
1654                                 ifcp = NULL;
1655                         if (!ifcp) {
1656                                 trace(1, "\tinvalid ifam_index %d, ignored\n",
1657                                         ifam->ifam_index);
1658                                 break;
1659                         }
1660                         if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK]))
1661                                 iface++;
1662                         break;
1663                 default:
1664                         trace(1, "\tnot supported yet, ignored\n");
1665                         break;
1666                 }
1667
1668         }
1669
1670         if (iface) {
1671                 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n");
1672                 ifconfig();
1673                 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
1674                         if (ifcp->ifc_cflags & IFC_CHANGED) {
1675                                 if (ifrt(ifcp, 1)) {
1676                                         for (ic = ifc; ic; ic = ic->ifc_next) {
1677                                                 if (ifcp->ifc_index == ic->ifc_index)
1678                                                         continue;
1679                                                 if (ic->ifc_flags & IFF_UP)
1680                                                         ripsend(ic, &ic->ifc_ripsin,
1681                                                         RRTF_CHANGED);
1682                                         }
1683                                         /* Reset the flag */
1684                                         for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1685                                                 rrt->rrt_rflags &= ~RRTF_CHANGED;
1686                                 }
1687                                 ifcp->ifc_cflags &= ~IFC_CHANGED;
1688                         }
1689         }
1690         if (rtable) {
1691                 trace(1, "rtsock: read routing table again\n");
1692                 krtread(1);
1693         }
1694 }
1695
1696 /*
1697  * remove specified route from the internal routing table.
1698  */
1699 static int
1700 rt_del(const struct sockaddr_in6 *sdst, const struct sockaddr_in6 *sgw,
1701        const struct sockaddr_in6 *smask)
1702 {
1703         const struct in6_addr *dst = NULL;
1704         const struct in6_addr *gw = NULL;
1705         int prefix;
1706         struct netinfo6 ni6;
1707         struct riprt *rrt = NULL;
1708         time_t t_lifetime;
1709
1710         if (sdst->sin6_family != AF_INET6) {
1711                 trace(1, "\tother AF, ignored\n");
1712                 return -1;
1713         }
1714         if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr)
1715          || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback)
1716          || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) {
1717                 trace(1, "\taddress %s not interesting, ignored\n",
1718                         inet6_n2p(&sdst->sin6_addr));
1719                 return -1;
1720         }
1721         dst = &sdst->sin6_addr;
1722         if (sgw->sin6_family == AF_INET6) {
1723                 /* easy case */
1724                 gw = &sgw->sin6_addr;
1725                 prefix = sin6mask2len(smask);
1726         } else if (sgw->sin6_family == AF_LINK) {
1727                 /*
1728                  * Interface route... a hard case.  We need to get the prefix
1729                  * length from the kernel, but we now are parsing rtmsg.
1730                  * We'll purge matching routes from my list, then get the
1731                  * fresh list.
1732                  */
1733                 struct riprt *longest;
1734                 trace(1, "\t%s is a interface route, guessing prefixlen\n",
1735                         inet6_n2p(dst));
1736                 longest = NULL;
1737                 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
1738                         if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
1739                                         &sdst->sin6_addr)
1740                          && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
1741                                 if (!longest
1742                                  || longest->rrt_info.rip6_plen <
1743                                                  rrt->rrt_info.rip6_plen) {
1744                                         longest = rrt;
1745                                 }
1746                         }
1747                 }
1748                 rrt = longest;
1749                 if (!rrt) {
1750                         trace(1, "\tno matching interface route found\n");
1751                         return -1;
1752                 }
1753                 gw = &in6addr_loopback;
1754                 prefix = rrt->rrt_info.rip6_plen;
1755         } else {
1756                 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family);
1757                 return -1;
1758         }
1759
1760         trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix);
1761         trace(1, "gw %s\n", inet6_n2p(gw));
1762         t_lifetime = time(NULL) - RIP_LIFETIME;
1763         /* age route for interface address */
1764         memset(&ni6, 0, sizeof(ni6));
1765         ni6.rip6_dest = *dst;
1766         ni6.rip6_plen = prefix;
1767         applyplen(&ni6.rip6_dest, ni6.rip6_plen);       /*to be sure*/
1768         trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest),
1769                 ni6.rip6_plen);
1770         if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) {
1771                 trace(1, "\tno route found\n");
1772                 return -1;
1773         }
1774 #if 0
1775         if ((rrt->rrt_flags & RTF_STATIC) == 0) {
1776                 trace(1, "\tyou can delete static routes only\n");
1777         } else
1778 #endif
1779         if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) {
1780                 trace(1, "\tgw mismatch: %s <-> ",
1781                         inet6_n2p(&rrt->rrt_gw));
1782                 trace(1, "%s\n", inet6_n2p(gw));
1783         } else {
1784                 trace(1, "\troute found, age it\n");
1785                 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1786                         rrt->rrt_t = t_lifetime;
1787                         rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1788                 }
1789         }
1790         return 0;
1791 }
1792
1793 /*
1794  * remove specified address from internal interface/routing table.
1795  */
1796 static int
1797 rt_deladdr(struct ifc *ifcp, const struct sockaddr_in6 *sifa,
1798            const struct sockaddr_in6 *smask)
1799 {
1800         const struct in6_addr *addr = NULL;
1801         int prefix;
1802         struct ifac *ifa = NULL;
1803         struct netinfo6 ni6;
1804         struct riprt *rrt = NULL;
1805         time_t t_lifetime;
1806         int updated = 0;
1807
1808         if (sifa->sin6_family != AF_INET6) {
1809                 trace(1, "\tother AF, ignored\n");
1810                 return -1;
1811         }
1812         addr = &sifa->sin6_addr;
1813         prefix = sin6mask2len(smask);
1814
1815         trace(1, "\tdeleting %s/%d from %s\n",
1816                 inet6_n2p(addr), prefix, ifcp->ifc_name);
1817         ifa = ifa_match(ifcp, addr, prefix);
1818         if (!ifa) {
1819                 trace(1, "\tno matching ifa found for %s/%d on %s\n",
1820                         inet6_n2p(addr), prefix, ifcp->ifc_name);
1821                 return -1;
1822         }
1823         if (ifa->ifa_conf != ifcp) {
1824                 trace(1, "\taddress table corrupt: back pointer does not match "
1825                         "(%s != %s)\n",
1826                         ifcp->ifc_name, ifa->ifa_conf->ifc_name);
1827                 return -1;
1828         }
1829         /* remove ifa from interface */
1830         if (ifcp->ifc_addr == ifa)
1831                 ifcp->ifc_addr = ifa->ifa_next;
1832         else {
1833                 struct ifac *p;
1834                 for (p = ifcp->ifc_addr; p; p = p->ifa_next) {
1835                         if (p->ifa_next == ifa) {
1836                                 p->ifa_next = ifa->ifa_next;
1837                                 break;
1838                         }
1839                 }
1840         }
1841         ifa->ifa_next = NULL;
1842         ifa->ifa_conf = NULL;
1843         t_lifetime = time(NULL) - RIP_LIFETIME;
1844         /* age route for interface address */
1845         memset(&ni6, 0, sizeof(ni6));
1846         ni6.rip6_dest = ifa->ifa_addr;
1847         ni6.rip6_plen = ifa->ifa_plen;
1848         applyplen(&ni6.rip6_dest, ni6.rip6_plen);
1849         trace(1, "\tfind interface route %s/%d on %d\n",
1850                 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index);
1851         if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1852                 struct in6_addr none;
1853                 memset(&none, 0, sizeof(none));
1854                 if (rrt->rrt_index == ifcp->ifc_index &&
1855                     (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) ||
1856                      IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) {
1857                         trace(1, "\troute found, age it\n");
1858                         if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1859                                 rrt->rrt_t = t_lifetime;
1860                                 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1861                         }
1862                         updated++;
1863                 } else {
1864                         trace(1, "\tnon-interface route found: %s/%d on %d\n",
1865                                 inet6_n2p(&rrt->rrt_info.rip6_dest),
1866                                 rrt->rrt_info.rip6_plen,
1867                                 rrt->rrt_index);
1868                 }
1869         } else
1870                 trace(1, "\tno interface route found\n");
1871         /* age route for p2p destination */
1872         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1873                 memset(&ni6, 0, sizeof(ni6));
1874                 ni6.rip6_dest = ifa->ifa_raddr;
1875                 ni6.rip6_plen = 128;
1876                 applyplen(&ni6.rip6_dest, ni6.rip6_plen);       /*to be sure*/
1877                 trace(1, "\tfind p2p route %s/%d on %d\n",
1878                         inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen,
1879                         ifcp->ifc_index);
1880                 if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1881                         if (rrt->rrt_index == ifcp->ifc_index &&
1882                             IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) {
1883                                 trace(1, "\troute found, age it\n");
1884                                 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1885                                         rrt->rrt_t = t_lifetime;
1886                                         rrt->rrt_info.rip6_metric =
1887                                             HOPCNT_INFINITY6;
1888                                         updated++;
1889                                 }
1890                         } else {
1891                                 trace(1, "\tnon-p2p route found: %s/%d on %d\n",
1892                                         inet6_n2p(&rrt->rrt_info.rip6_dest),
1893                                         rrt->rrt_info.rip6_plen,
1894                                         rrt->rrt_index);
1895                         }
1896                 } else
1897                         trace(1, "\tno p2p route found\n");
1898         }
1899         return updated ? 0 : -1;
1900 }
1901
1902 /*
1903  * Get each interface address and put those interface routes to the route
1904  * list.
1905  */
1906 static int
1907 ifrt(struct ifc *ifcp, int again)
1908 {
1909         struct ifac *ifa;
1910         struct riprt *rrt, *search_rrt, *prev_rrt, *loop_rrt;
1911         struct netinfo6 *np;
1912         time_t t_lifetime;
1913         int need_trigger = 0;
1914
1915         if (ifcp->ifc_flags & IFF_LOOPBACK)
1916                 return 0;                       /* ignore loopback */
1917         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1918                 ifrt_p2p(ifcp, again);
1919                 return 0;
1920         }
1921
1922         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
1923                 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1924 #if 0
1925                         trace(1, "route: %s on %s: "
1926                             "skip linklocal interface address\n",
1927                             inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name);
1928 #endif
1929                         continue;
1930                 }
1931                 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) {
1932 #if 0
1933                         trace(1, "route: %s: skip unspec interface address\n",
1934                             ifcp->ifc_name);
1935 #endif
1936                         continue;
1937                 }
1938                 if (ifcp->ifc_flags & IFF_UP) {
1939                         if ((rrt = MALLOC(struct riprt)) == NULL)
1940                                 fatal("malloc: struct riprt");
1941                         memset(rrt, 0, sizeof(*rrt));
1942                         rrt->rrt_same = NULL;
1943                         rrt->rrt_index = ifcp->ifc_index;
1944                         rrt->rrt_t = 0; /* don't age */
1945                         rrt->rrt_info.rip6_dest = ifa->ifa_addr;
1946                         rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
1947                         rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
1948                         rrt->rrt_info.rip6_plen = ifa->ifa_plen;
1949                         rrt->rrt_flags = RTF_CLONING;
1950                         rrt->rrt_rflags |= RRTF_CHANGED;
1951                         applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen);
1952                         memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
1953 #if 0
1954                         /* XXX why gateway address == network adddress? */
1955                         rrt->rrt_gw = ifa->ifa_addr;
1956 #endif
1957                         np = &rrt->rrt_info;
1958                         search_rrt = rtsearch(np, &prev_rrt);
1959                         if (search_rrt != NULL) {
1960                                 if (search_rrt->rrt_info.rip6_metric >
1961                                     rrt->rrt_info.rip6_metric) {
1962                                         if (prev_rrt)
1963                                                 prev_rrt->rrt_next = rrt->rrt_next;
1964                                         else
1965                                                 riprt = rrt->rrt_next;
1966                                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
1967                                         free(rrt);
1968                                 } else {
1969                                         /* Already have better route */
1970                                         if (!again) {
1971                                                 trace(1, "route: %s/%d: "
1972                                                     "already registered (%s)\n",
1973                                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
1974                                                     ifcp->ifc_name);
1975                                         }
1976                                         free(rrt);
1977                                         continue;
1978                                 }
1979                         }
1980                         /* Attach the route to the list */
1981                         trace(1, "route: %s/%d: register route (%s)\n",
1982                             inet6_n2p(&np->rip6_dest), np->rip6_plen,
1983                             ifcp->ifc_name);
1984                         rrt->rrt_next = riprt;
1985                         riprt = rrt;
1986                         addroute(rrt, &rrt->rrt_gw, ifcp);
1987                         sendrequest(ifcp);
1988                         ripsend(ifcp, &ifcp->ifc_ripsin, 0);
1989                         need_trigger = 1;
1990                 } else {
1991                         for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) {
1992                                 if (loop_rrt->rrt_index == ifcp->ifc_index) {
1993                                         t_lifetime = time(NULL) - RIP_LIFETIME;
1994                                         if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) {
1995                                                 loop_rrt->rrt_t = t_lifetime;
1996                                                 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1997                                                 loop_rrt->rrt_rflags |= RRTF_CHANGED;
1998                                                 need_trigger = 1;
1999                                         }
2000                                 }
2001                         }
2002                 }
2003         }
2004         return need_trigger;
2005 }
2006
2007 /*
2008  * there are couple of p2p interface routing models.  "behavior" lets
2009  * you pick one.  it looks that gated behavior fits best with BSDs,
2010  * since BSD kernels does not look at prefix length on p2p interfaces.
2011  */
2012 static void
2013 ifrt_p2p(struct ifc *ifcp, int again)
2014 {
2015         struct ifac *ifa;
2016         struct riprt *rrt, *orrt, *prevrrt;
2017         struct netinfo6 *np;
2018         struct in6_addr addr, dest;
2019         int advert, ignore, i;
2020 #define P2PADVERT_NETWORK       1
2021 #define P2PADVERT_ADDR          2
2022 #define P2PADVERT_DEST          4
2023 #define P2PADVERT_MAX           4
2024         const enum { CISCO, GATED, ROUTE6D } behavior = GATED;
2025         const char *category = "";
2026         const char *noadv;
2027
2028         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2029                 addr = ifa->ifa_addr;
2030                 dest = ifa->ifa_raddr;
2031                 applyplen(&addr, ifa->ifa_plen);
2032                 applyplen(&dest, ifa->ifa_plen);
2033                 advert = ignore = 0;
2034                 switch (behavior) {
2035                 case CISCO:
2036                         /*
2037                          * honor addr/plen, just like normal shared medium
2038                          * interface.  this may cause trouble if you reuse
2039                          * addr/plen on other interfaces.
2040                          *
2041                          * advertise addr/plen.
2042                          */
2043                         advert |= P2PADVERT_NETWORK;
2044                         break;
2045                 case GATED:
2046                         /*
2047                          * prefixlen on p2p interface is meaningless.
2048                          * advertise addr/128 and dest/128.
2049                          *
2050                          * do not install network route to route6d routing
2051                          * table (if we do, it would prevent route installation
2052                          * for other p2p interface that shares addr/plen).
2053                          *
2054                          * XXX what should we do if dest is ::?  it will not
2055                          * get announced anyways (see following filter),
2056                          * but we need to think.
2057                          */
2058                         advert |= P2PADVERT_ADDR;
2059                         advert |= P2PADVERT_DEST;
2060                         ignore |= P2PADVERT_NETWORK;
2061                         break;
2062                 case ROUTE6D:
2063                         /*
2064                          * just for testing.  actually the code is redundant
2065                          * given the current p2p interface address assignment
2066                          * rule for kame kernel.
2067                          *
2068                          * intent:
2069                          *      A/n -> announce A/n
2070                          *      A B/n, A and B share prefix -> A/n (= B/n)
2071                          *      A B/n, do not share prefix -> A/128 and B/128
2072                          * actually, A/64 and A B/128 are the only cases
2073                          * permitted by the kernel:
2074                          *      A/64 -> A/64
2075                          *      A B/128 -> A/128 and B/128
2076                          */
2077                         if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) {
2078                                 if (IN6_ARE_ADDR_EQUAL(&addr, &dest))
2079                                         advert |= P2PADVERT_NETWORK;
2080                                 else {
2081                                         advert |= P2PADVERT_ADDR;
2082                                         advert |= P2PADVERT_DEST;
2083                                         ignore |= P2PADVERT_NETWORK;
2084                                 }
2085                         } else
2086                                 advert |= P2PADVERT_NETWORK;
2087                         break;
2088                 }
2089
2090                 for (i = 1; i <= P2PADVERT_MAX; i *= 2) {
2091                         if ((ignore & i) != 0)
2092                                 continue;
2093                         if ((rrt = MALLOC(struct riprt)) == NULL) {
2094                                 fatal("malloc: struct riprt");
2095                                 /*NOTREACHED*/
2096                         }
2097                         memset(rrt, 0, sizeof(*rrt));
2098                         rrt->rrt_same = NULL;
2099                         rrt->rrt_index = ifcp->ifc_index;
2100                         rrt->rrt_t = 0; /* don't age */
2101                         switch (i) {
2102                         case P2PADVERT_NETWORK:
2103                                 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2104                                 rrt->rrt_info.rip6_plen = ifa->ifa_plen;
2105                                 applyplen(&rrt->rrt_info.rip6_dest,
2106                                     ifa->ifa_plen);
2107                                 category = "network";
2108                                 break;
2109                         case P2PADVERT_ADDR:
2110                                 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2111                                 rrt->rrt_info.rip6_plen = 128;
2112                                 rrt->rrt_gw = in6addr_loopback;
2113                                 category = "addr";
2114                                 break;
2115                         case P2PADVERT_DEST:
2116                                 rrt->rrt_info.rip6_dest = ifa->ifa_raddr;
2117                                 rrt->rrt_info.rip6_plen = 128;
2118                                 rrt->rrt_gw = ifa->ifa_addr;
2119                                 category = "dest";
2120                                 break;
2121                         }
2122                         if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) ||
2123                             IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) {
2124 #if 0
2125                                 trace(1, "route: %s: skip unspec/linklocal "
2126                                     "(%s on %s)\n", category, ifcp->ifc_name);
2127 #endif
2128                                 free(rrt);
2129                                 continue;
2130                         }
2131                         if ((advert & i) == 0) {
2132                                 rrt->rrt_rflags |= RRTF_NOADVERTISE;
2133                                 noadv = ", NO-ADV";
2134                         } else
2135                                 noadv = "";
2136                         rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2137                         rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
2138                         np = &rrt->rrt_info;
2139                         orrt = rtsearch(np, &prevrrt);
2140                         if (!orrt) {
2141                                 /* Attach the route to the list */
2142                                 trace(1, "route: %s/%d: register route "
2143                                     "(%s on %s%s)\n",
2144                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2145                                     category, ifcp->ifc_name, noadv);
2146                                 rrt->rrt_next = riprt;
2147                                 riprt = rrt;
2148                         } else if (rrt->rrt_index != orrt->rrt_index ||
2149                             rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) {
2150                                 /* swap route */
2151                                 rrt->rrt_next = orrt->rrt_next;
2152                                 if (prevrrt)
2153                                         prevrrt->rrt_next = rrt;
2154                                 else
2155                                         riprt = rrt;
2156                                 free(orrt);
2157
2158                                 trace(1, "route: %s/%d: update (%s on %s%s)\n",
2159                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2160                                     category, ifcp->ifc_name, noadv);
2161                         } else {
2162                                 /* Already found */
2163                                 if (!again) {
2164                                         trace(1, "route: %s/%d: "
2165                                             "already registered (%s on %s%s)\n",
2166                                             inet6_n2p(&np->rip6_dest),
2167                                             np->rip6_plen, category,
2168                                             ifcp->ifc_name, noadv);
2169                                 }
2170                                 free(rrt);
2171                         }
2172                 }
2173         }
2174 #undef P2PADVERT_NETWORK
2175 #undef P2PADVERT_ADDR
2176 #undef P2PADVERT_DEST
2177 #undef P2PADVERT_MAX
2178 }
2179
2180 static int
2181 getifmtu(int ifindex)
2182 {
2183         int     mib[6];
2184         char    *buf;
2185         size_t  msize;
2186         struct  if_msghdr *ifm;
2187         int     mtu;
2188
2189         mib[0] = CTL_NET;
2190         mib[1] = PF_ROUTE;
2191         mib[2] = 0;
2192         mib[3] = AF_INET6;
2193         mib[4] = NET_RT_IFLIST;
2194         mib[5] = ifindex;
2195         if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2196                 fatal("sysctl estimate NET_RT_IFLIST");
2197                 /*NOTREACHED*/
2198         }
2199         if ((buf = malloc(msize)) == NULL) {
2200                 fatal("malloc");
2201                 /*NOTREACHED*/
2202         }
2203         if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2204                 fatal("sysctl NET_RT_IFLIST");
2205                 /*NOTREACHED*/
2206         }
2207         ifm = (struct if_msghdr *)buf;
2208         mtu = ifm->ifm_data.ifi_mtu;
2209 #ifdef __DragonFly__
2210         if (ifindex != ifm->ifm_index) {
2211                 fatal("ifindex does not match with ifm_index");
2212                 /*NOTREACHED*/
2213         }
2214 #endif
2215         free(buf);
2216         return mtu;
2217 }
2218
2219 static const char *
2220 rttypes(struct rt_msghdr *rtm)
2221 {
2222 #define RTTYPE(s, f) \
2223 do { \
2224         if (rtm->rtm_type == (f)) \
2225                 return (s); \
2226 } while (0)
2227         RTTYPE("ADD", RTM_ADD);
2228         RTTYPE("DELETE", RTM_DELETE);
2229         RTTYPE("CHANGE", RTM_CHANGE);
2230         RTTYPE("GET", RTM_GET);
2231         RTTYPE("LOSING", RTM_LOSING);
2232         RTTYPE("REDIRECT", RTM_REDIRECT);
2233         RTTYPE("MISS", RTM_MISS);
2234         RTTYPE("LOCK", RTM_LOCK);
2235         RTTYPE("RESOLVE", RTM_RESOLVE);
2236         RTTYPE("NEWADDR", RTM_NEWADDR);
2237         RTTYPE("DELADDR", RTM_DELADDR);
2238         RTTYPE("IFINFO", RTM_IFINFO);
2239 #ifdef RTM_OIFINFO
2240         RTTYPE("OIFINFO", RTM_OIFINFO);
2241 #endif
2242 #ifdef RTM_IFANNOUNCE
2243         RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE);
2244 #endif
2245 #ifdef RTM_NEWMADDR
2246         RTTYPE("NEWMADDR", RTM_NEWMADDR);
2247 #endif
2248 #ifdef RTM_DELMADDR
2249         RTTYPE("DELMADDR", RTM_DELMADDR);
2250 #endif
2251 #undef RTTYPE
2252         return NULL;
2253 }
2254
2255 static const char *
2256 rtflags(struct rt_msghdr *rtm)
2257 {
2258         static char buf[BUFSIZ];
2259
2260         /*
2261          * letter conflict should be okay.  painful when *BSD diverges...
2262          */
2263         strlcpy(buf, "", sizeof(buf));
2264 #define RTFLAG(s, f) \
2265 do { \
2266         if (rtm->rtm_flags & (f)) \
2267                 strlcat(buf, (s), sizeof(buf)); \
2268 } while (0)
2269         RTFLAG("U", RTF_UP);
2270         RTFLAG("G", RTF_GATEWAY);
2271         RTFLAG("H", RTF_HOST);
2272         RTFLAG("R", RTF_REJECT);
2273         RTFLAG("D", RTF_DYNAMIC);
2274         RTFLAG("M", RTF_MODIFIED);
2275         RTFLAG("d", RTF_DONE);
2276 #ifdef  RTF_MASK
2277         RTFLAG("m", RTF_MASK);
2278 #endif
2279         RTFLAG("C", RTF_CLONING);
2280 #ifdef RTF_CLONED
2281         RTFLAG("c", RTF_CLONED);
2282 #endif
2283 #ifdef RTF_PRCLONING
2284         RTFLAG("c", RTF_PRCLONING);
2285 #endif
2286 #ifdef RTF_WASCLONED
2287         RTFLAG("W", RTF_WASCLONED);
2288 #endif
2289         RTFLAG("X", RTF_XRESOLVE);
2290         RTFLAG("L", RTF_LLINFO);
2291         RTFLAG("S", RTF_STATIC);
2292         RTFLAG("B", RTF_BLACKHOLE);
2293 #ifdef RTF_PROTO3
2294         RTFLAG("3", RTF_PROTO3);
2295 #endif
2296         RTFLAG("2", RTF_PROTO2);
2297         RTFLAG("1", RTF_PROTO1);
2298 #ifdef RTF_BROADCAST
2299         RTFLAG("b", RTF_BROADCAST);
2300 #endif
2301 #ifdef RTF_DEFAULT
2302         RTFLAG("d", RTF_DEFAULT);
2303 #endif
2304 #ifdef RTF_ISAROUTER
2305         RTFLAG("r", RTF_ISAROUTER);
2306 #endif
2307 #ifdef RTF_TUNNEL
2308         RTFLAG("T", RTF_TUNNEL);
2309 #endif
2310 #ifdef RTF_AUTH
2311         RTFLAG("A", RTF_AUTH);
2312 #endif
2313 #ifdef RTF_CRYPT
2314         RTFLAG("E", RTF_CRYPT);
2315 #endif
2316 #undef RTFLAG
2317         return buf;
2318 }
2319
2320 static const char *
2321 ifflags(int flags)
2322 {
2323         static char buf[BUFSIZ];
2324
2325         strlcpy(buf, "", sizeof(buf));
2326 #define IFFLAG(s, f) \
2327 do { \
2328         if (flags & f) { \
2329                 if (buf[0]) \
2330                         strlcat(buf, ",", sizeof(buf)); \
2331                 strlcat(buf, s, sizeof(buf)); \
2332         } \
2333 } while (0)
2334         IFFLAG("UP", IFF_UP);
2335         IFFLAG("BROADCAST", IFF_BROADCAST);
2336         IFFLAG("DEBUG", IFF_DEBUG);
2337         IFFLAG("LOOPBACK", IFF_LOOPBACK);
2338         IFFLAG("POINTOPOINT", IFF_POINTOPOINT);
2339 #ifdef IFF_NOTRAILERS
2340         IFFLAG("NOTRAILERS", IFF_NOTRAILERS);
2341 #endif
2342 #ifdef IFF_SMART
2343         IFFLAG("SMART", IFF_SMART);
2344 #endif
2345         IFFLAG("RUNNING", IFF_RUNNING);
2346         IFFLAG("NOARP", IFF_NOARP);
2347         IFFLAG("PROMISC", IFF_PROMISC);
2348         IFFLAG("ALLMULTI", IFF_ALLMULTI);
2349         IFFLAG("OACTIVE", IFF_OACTIVE);
2350         IFFLAG("SIMPLEX", IFF_SIMPLEX);
2351         IFFLAG("LINK0", IFF_LINK0);
2352         IFFLAG("LINK1", IFF_LINK1);
2353         IFFLAG("LINK2", IFF_LINK2);
2354         IFFLAG("MULTICAST", IFF_MULTICAST);
2355 #undef IFFLAG
2356         return buf;
2357 }
2358
2359 static void
2360 krtread(int again)
2361 {
2362         int mib[6];
2363         size_t msize;
2364         char *buf, *p, *lim;
2365         struct rt_msghdr *rtm;
2366         int retry;
2367         const char *errmsg;
2368
2369         retry = 0;
2370         buf = NULL;
2371         mib[0] = CTL_NET;
2372         mib[1] = PF_ROUTE;
2373         mib[2] = 0;
2374         mib[3] = AF_INET6;      /* Address family */
2375         mib[4] = NET_RT_DUMP;   /* Dump the kernel routing table */
2376         mib[5] = 0;             /* No flags */
2377         do {
2378                 retry++;
2379                 errmsg = NULL;
2380                 if (buf)
2381                         free(buf);
2382                 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2383                         errmsg = "sysctl estimate";
2384                         continue;
2385                 }
2386                 if ((buf = malloc(msize)) == NULL) {
2387                         errmsg = "malloc";
2388                         continue;
2389                 }
2390                 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2391                         errmsg = "sysctl NET_RT_DUMP";
2392                         continue;
2393                 }
2394         } while (retry < 5 && errmsg != NULL);
2395         if (errmsg) {
2396                 fatal("%s (with %d retries, msize=%lu)", errmsg, retry,
2397                     (u_long)msize);
2398                 /*NOTREACHED*/
2399         } else if (1 < retry)
2400                 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry);
2401
2402         lim = buf + msize;
2403         for (p = buf; p < lim; p += rtm->rtm_msglen) {
2404                 rtm = (struct rt_msghdr *)p;
2405                 rt_entry(rtm, again);
2406         }
2407         free(buf);
2408 }
2409
2410 static void
2411 rt_entry(struct rt_msghdr *rtm, int again)
2412 {
2413         struct  sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask;
2414         struct  sockaddr_in6 *sin6_genmask, *sin6_ifp;
2415         char    *rtmp, *ifname = NULL;
2416         struct  riprt *rrt, *orrt;
2417         struct  netinfo6 *np;
2418         int     s;
2419
2420         sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = NULL;
2421         if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags &
2422                 (RTF_CLONING|RTF_XRESOLVE|RTF_LLINFO|RTF_BLACKHOLE)) {
2423                 return;         /* not interested in the link route */
2424         }
2425         /* do not look at cloned routes */
2426 #ifdef RTF_WASCLONED
2427         if (rtm->rtm_flags & RTF_WASCLONED)
2428                 return;
2429 #endif
2430 #ifdef RTF_CLONED
2431         if (rtm->rtm_flags & RTF_CLONED)
2432                 return;
2433 #endif
2434         /*
2435          * do not look at dynamic routes.
2436          * netbsd/openbsd cloned routes have UGHD.
2437          */
2438         if (rtm->rtm_flags & RTF_DYNAMIC)
2439                 return;
2440         rtmp = (char *)(rtm + 1);
2441         /* Destination */
2442         if ((rtm->rtm_addrs & RTA_DST) == 0)
2443                 return;         /* ignore routes without destination address */
2444         sin6_dst = (struct sockaddr_in6 *)rtmp;
2445         rtmp += RT_ROUNDUP(sin6_dst->sin6_len);
2446         if (rtm->rtm_addrs & RTA_GATEWAY) {
2447                 sin6_gw = (struct sockaddr_in6 *)rtmp;
2448                 rtmp += RT_ROUNDUP(sin6_gw->sin6_len);
2449         }
2450         if (rtm->rtm_addrs & RTA_NETMASK) {
2451                 sin6_mask = (struct sockaddr_in6 *)rtmp;
2452                 rtmp += RT_ROUNDUP(sin6_mask->sin6_len);
2453         }
2454         if (rtm->rtm_addrs & RTA_GENMASK) {
2455                 sin6_genmask = (struct sockaddr_in6 *)rtmp;
2456                 rtmp += RT_ROUNDUP(sin6_genmask->sin6_len);
2457         }
2458         if (rtm->rtm_addrs & RTA_IFP) {
2459                 sin6_ifp = (struct sockaddr_in6 *)rtmp;
2460                 rtmp += RT_ROUNDUP(sin6_ifp->sin6_len);
2461         }
2462
2463         /* Destination */
2464         if (sin6_dst->sin6_family != AF_INET6)
2465                 return;
2466         if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr))
2467                 return;         /* Link-local */
2468         if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback))
2469                 return;         /* Loopback */
2470         if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr))
2471                 return;
2472
2473         if ((rrt = MALLOC(struct riprt)) == NULL) {
2474                 fatal("malloc: struct riprt");
2475                 /*NOTREACHED*/
2476         }
2477         memset(rrt, 0, sizeof(*rrt));
2478         np = &rrt->rrt_info;
2479         rrt->rrt_same = NULL;
2480         rrt->rrt_t = time(NULL);
2481         if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC))
2482                 rrt->rrt_t = 0; /* Don't age static routes */
2483 #if 0
2484         np->rip6_tag = htons(routetag & 0xffff);
2485 #else
2486         np->rip6_tag = 0;
2487 #endif
2488         np->rip6_metric = rtm->rtm_rmx.rmx_hopcount;
2489         if (np->rip6_metric < 1)
2490                 np->rip6_metric = 1;
2491         rrt->rrt_flags = rtm->rtm_flags;
2492         np->rip6_dest = sin6_dst->sin6_addr;
2493
2494         /* Mask or plen */
2495         if (rtm->rtm_flags & RTF_HOST)
2496                 np->rip6_plen = 128;    /* Host route */
2497         else if (sin6_mask)
2498                 np->rip6_plen = sin6mask2len(sin6_mask);
2499         else
2500                 np->rip6_plen = 0;
2501
2502         orrt = rtsearch(np, NULL);
2503         if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) {
2504                 /* Already found */
2505                 if (!again) {
2506                         trace(1, "route: %s/%d flags %s: already registered\n",
2507                                 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2508                                 rtflags(rtm));
2509                 }
2510                 free(rrt);
2511                 return;
2512         }
2513         /* Gateway */
2514         if (!sin6_gw)
2515                 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2516         else {
2517                 if (sin6_gw->sin6_family == AF_INET6)
2518                         rrt->rrt_gw = sin6_gw->sin6_addr;
2519                 else if (sin6_gw->sin6_family == AF_LINK) {
2520                         /* XXX in case ppp link? */
2521                         rrt->rrt_gw = in6addr_loopback;
2522                 } else
2523                         memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2524         }
2525         trace(1, "route: %s/%d flags %s",
2526                 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm));
2527         trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw));
2528
2529         /* Interface */
2530         s = rtm->rtm_index;
2531         if (s < nindex2ifc && index2ifc[s])
2532                 ifname = index2ifc[s]->ifc_name;
2533         else {
2534                 trace(1, " not configured\n");
2535                 free(rrt);
2536                 return;
2537         }
2538         trace(1, " if %s sock %d", ifname, s);
2539         rrt->rrt_index = s;
2540
2541         trace(1, "\n");
2542
2543         /* Check gateway */
2544         if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) &&
2545             !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)
2546 #ifdef __DragonFly__
2547          && (rrt->rrt_flags & RTF_LOCAL) == 0
2548 #endif
2549             ) {
2550                 trace(0, "***** Gateway %s is not a link-local address.\n",
2551                         inet6_n2p(&rrt->rrt_gw));
2552                 trace(0, "*****     dest(%s) if(%s) -- Not optimized.\n",
2553                         inet6_n2p(&rrt->rrt_info.rip6_dest), ifname);
2554                 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR;
2555         }
2556
2557         /* Put it to the route list */
2558         if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) {
2559                 /* replace route list */
2560                 rrt->rrt_next = orrt->rrt_next;
2561                 *orrt = *rrt;
2562                 trace(1, "route: %s/%d flags %s: replace new route\n",
2563                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2564                     rtflags(rtm));
2565                 free(rrt);
2566         } else {
2567                 rrt->rrt_next = riprt;
2568                 riprt = rrt;
2569         }
2570 }
2571
2572 static int
2573 addroute(struct riprt *rrt, const struct in6_addr *gw, struct ifc *ifcp)
2574 {
2575         struct  netinfo6 *np;
2576         u_char  buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ];
2577         struct  rt_msghdr       *rtm;
2578         struct  sockaddr_in6    *sin;
2579         int     len;
2580
2581         np = &rrt->rrt_info;
2582         inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1));
2583         inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2));
2584         tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n",
2585                 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2586                 np->rip6_metric - 1, buf2);
2587         if (rtlog)
2588                 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(),
2589                         inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2590                         np->rip6_metric - 1, buf2);
2591         if (nflag)
2592                 return 0;
2593
2594         memset(buf, 0, sizeof(buf));
2595         rtm = (struct rt_msghdr *)buf;
2596         rtm->rtm_type = RTM_ADD;
2597         rtm->rtm_version = RTM_VERSION;
2598         rtm->rtm_seq = ++seq;
2599         rtm->rtm_pid = pid;
2600         rtm->rtm_flags = rrt->rrt_flags;
2601         rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2602         rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1;
2603         rtm->rtm_inits = RTV_HOPCOUNT;
2604         sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2605         /* Destination */
2606         sin->sin6_len = sizeof(struct sockaddr_in6);
2607         sin->sin6_family = AF_INET6;
2608         sin->sin6_addr = np->rip6_dest;
2609         sin = (struct sockaddr_in6 *)((char *)sin + RT_ROUNDUP(sin->sin6_len));
2610         /* Gateway */
2611         sin->sin6_len = sizeof(struct sockaddr_in6);
2612         sin->sin6_family = AF_INET6;
2613         sin->sin6_addr = *gw;
2614         sin = (struct sockaddr_in6 *)((char *)sin + RT_ROUNDUP(sin->sin6_len));
2615         /* Netmask */
2616         sin->sin6_len = sizeof(struct sockaddr_in6);
2617         sin->sin6_family = AF_INET6;
2618         sin->sin6_addr = *(plen2mask(np->rip6_plen));
2619         sin = (struct sockaddr_in6 *)((char *)sin + RT_ROUNDUP(sin->sin6_len));
2620
2621         len = (char *)sin - (char *)buf;
2622         rtm->rtm_msglen = len;
2623         if (write(rtsock, buf, len) > 0)
2624                 return 0;
2625
2626         if (errno == EEXIST) {
2627                 trace(0, "ADD: Route already exists %s/%d gw %s\n",
2628                         inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2629                 if (rtlog)
2630                         fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n",
2631                                 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2632         } else {
2633                 trace(0, "Can not write to rtsock (addroute): %s\n",
2634                         strerror(errno));
2635                 if (rtlog)
2636                         fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2637                                 strerror(errno));
2638         }
2639         return -1;
2640 }
2641
2642 static int
2643 delroute(struct netinfo6 *np, struct in6_addr *gw)
2644 {
2645         u_char  buf[BUFSIZ], buf2[BUFSIZ];
2646         struct  rt_msghdr       *rtm;
2647         struct  sockaddr_in6    *sin;
2648         int     len;
2649
2650         inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2));
2651         tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest),
2652                 np->rip6_plen, buf2);
2653         if (rtlog)
2654                 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n",
2655                         hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2656         if (nflag)
2657                 return 0;
2658
2659         memset(buf, 0, sizeof(buf));
2660         rtm = (struct rt_msghdr *)buf;
2661         rtm->rtm_type = RTM_DELETE;
2662         rtm->rtm_version = RTM_VERSION;
2663         rtm->rtm_seq = ++seq;
2664         rtm->rtm_pid = pid;
2665         rtm->rtm_flags = RTF_UP | RTF_GATEWAY;
2666         if (np->rip6_plen == sizeof(struct in6_addr) * 8)
2667                 rtm->rtm_flags |= RTF_HOST;
2668         rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2669         sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2670         /* Destination */
2671         sin->sin6_len = sizeof(struct sockaddr_in6);
2672         sin->sin6_family = AF_INET6;
2673         sin->sin6_addr = np->rip6_dest;
2674         sin = (struct sockaddr_in6 *)((char *)sin + RT_ROUNDUP(sin->sin6_len));
2675         /* Gateway */
2676         sin->sin6_len = sizeof(struct sockaddr_in6);
2677         sin->sin6_family = AF_INET6;
2678         sin->sin6_addr = *gw;
2679         sin = (struct sockaddr_in6 *)((char *)sin + RT_ROUNDUP(sin->sin6_len));
2680         /* Netmask */
2681         sin->sin6_len = sizeof(struct sockaddr_in6);
2682         sin->sin6_family = AF_INET6;
2683         sin->sin6_addr = *(plen2mask(np->rip6_plen));
2684         sin = (struct sockaddr_in6 *)((char *)sin + RT_ROUNDUP(sin->sin6_len));
2685
2686         len = (char *)sin - (char *)buf;
2687         rtm->rtm_msglen = len;
2688         if (write(rtsock, buf, len) >= 0)
2689                 return 0;
2690
2691         if (errno == ESRCH) {
2692                 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n",
2693                         inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2694                 if (rtlog)
2695                         fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n",
2696                                 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2697         } else {
2698                 trace(0, "Can not write to rtsock (delroute): %s\n",
2699                         strerror(errno));
2700                 if (rtlog)
2701                         fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2702                                 strerror(errno));
2703         }
2704         return -1;
2705 }
2706
2707 #if 0
2708 static struct in6_addr *
2709 getroute(struct netinfo6 *np, struct in6_addr *gw)
2710 {
2711         u_char buf[BUFSIZ];
2712         u_long myseq;
2713         int len;
2714         struct rt_msghdr *rtm;
2715         struct sockaddr_in6 *sin;
2716
2717         rtm = (struct rt_msghdr *)buf;
2718         len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6);
2719         memset(rtm, 0, len);
2720         rtm->rtm_type = RTM_GET;
2721         rtm->rtm_version = RTM_VERSION;
2722         myseq = ++seq;
2723         rtm->rtm_seq = myseq;
2724         rtm->rtm_addrs = RTA_DST;
2725         rtm->rtm_msglen = len;
2726         sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2727         sin->sin6_len = sizeof(struct sockaddr_in6);
2728         sin->sin6_family = AF_INET6;
2729         sin->sin6_addr = np->rip6_dest;
2730         if (write(rtsock, buf, len) < 0) {
2731                 if (errno == ESRCH)     /* No such route found */
2732                         return NULL;
2733                 perror("write to rtsock");
2734                 exit(1);
2735         }
2736         do {
2737                 if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
2738                         perror("read from rtsock");
2739                         exit(1);
2740                 }
2741                 rtm = (struct rt_msghdr *)buf;
2742         } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid);
2743         sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2744         if (rtm->rtm_addrs & RTA_DST) {
2745                 sin = (struct sockaddr_in6 *)
2746                         ((char *)sin + RT_ROUNDUP(sin->sin6_len));
2747         }
2748         if (rtm->rtm_addrs & RTA_GATEWAY) {
2749                 *gw = sin->sin6_addr;
2750                 return gw;
2751         }
2752         return NULL;
2753 }
2754 #endif
2755
2756 static const char *
2757 inet6_n2p(const struct in6_addr *p)
2758 {
2759         static char buf[BUFSIZ];
2760
2761         return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf));
2762 }
2763
2764 static void
2765 ifrtdump(int sig)
2766 {
2767         ifdump(sig);
2768         rtdump(sig);
2769 }
2770
2771 static void
2772 ifdump(int sig)
2773 {
2774         struct ifc *ifcp;
2775         FILE *dump;
2776         int i;
2777
2778         if (sig == 0)
2779                 dump = stderr;
2780         else
2781                 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2782                         dump = stderr;
2783
2784         fprintf(dump, "%s: Interface Table Dump\n", hms());
2785         fprintf(dump, "  Number of interfaces: %d\n", nifc);
2786         for (i = 0; i < 2; i++) {
2787                 fprintf(dump, "  %sadvertising interfaces:\n", i ? "non-" : "");
2788                 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
2789                         if (i == 0) {
2790                                 if ((ifcp->ifc_flags & IFF_UP) == 0)
2791                                         continue;
2792                                 if (iff_find(ifcp, 'N') != NULL)
2793                                         continue;
2794                         } else {
2795                                 if (ifcp->ifc_flags & IFF_UP)
2796                                         continue;
2797                         }
2798                         ifdump0(dump, ifcp);
2799                 }
2800         }
2801         fprintf(dump, "\n");
2802         if (dump != stderr)
2803                 fclose(dump);
2804 }
2805
2806 static void
2807 ifdump0(FILE *dump, const struct ifc *ifcp)
2808 {
2809         struct ifac *ifa;
2810         struct iff *iffp;
2811         char buf[BUFSIZ];
2812         const char *ft;
2813         int addr;
2814
2815         fprintf(dump, "    %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n",
2816                 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags),
2817                 inet6_n2p(&ifcp->ifc_mylladdr),
2818                 ifcp->ifc_mtu, ifcp->ifc_metric);
2819         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2820                 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
2821                         inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr,
2822                                 buf, sizeof(buf));
2823                         fprintf(dump, "\t%s/%d -- %s\n",
2824                                 inet6_n2p(&ifa->ifa_addr),
2825                                 ifa->ifa_plen, buf);
2826                 } else {
2827                         fprintf(dump, "\t%s/%d\n",
2828                                 inet6_n2p(&ifa->ifa_addr),
2829                                 ifa->ifa_plen);
2830                 }
2831         }
2832         if (ifcp->ifc_filter) {
2833                 fprintf(dump, "\tFilter:");
2834                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
2835                         addr = 0;
2836                         switch (iffp->iff_type) {
2837                         case 'A':
2838                                 ft = "Aggregate"; addr++; break;
2839                         case 'N':
2840                                 ft = "No-use"; break;
2841                         case 'O':
2842                                 ft = "Advertise-only"; addr++; break;
2843                         case 'T':
2844                                 ft = "Default-only"; break;
2845                         case 'L':
2846                                 ft = "Listen-only"; addr++; break;
2847                         default:
2848                                 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type);
2849                                 ft = buf;
2850                                 addr++;
2851                                 break;
2852                         }
2853                         fprintf(dump, " %s", ft);
2854                         if (addr) {
2855                                 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr),
2856                                         iffp->iff_plen);
2857                         }
2858                 }
2859                 fprintf(dump, "\n");
2860         }
2861 }
2862
2863 static void
2864 rtdump(int sig)
2865 {
2866         struct  riprt *rrt;
2867         char    buf[BUFSIZ];
2868         FILE    *dump;
2869         time_t  t, age;
2870
2871         if (sig == 0)
2872                 dump = stderr;
2873         else
2874                 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2875                         dump = stderr;
2876
2877         t = time(NULL);
2878         fprintf(dump, "\n%s: Routing Table Dump\n", hms());
2879         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
2880                 if (rrt->rrt_t == 0)
2881                         age = 0;
2882                 else
2883                         age = t - rrt->rrt_t;
2884                 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest,
2885                         buf, sizeof(buf));
2886                 fprintf(dump, "    %s/%d if(%d:%s) gw(%s) [%d] age(%ld)",
2887                         buf, rrt->rrt_info.rip6_plen, rrt->rrt_index,
2888                         index2ifc[rrt->rrt_index]->ifc_name,
2889                         inet6_n2p(&rrt->rrt_gw),
2890                         rrt->rrt_info.rip6_metric, (long)age);
2891                 if (rrt->rrt_info.rip6_tag) {
2892                         fprintf(dump, " tag(0x%04x)",
2893                                 ntohs(rrt->rrt_info.rip6_tag) & 0xffff);
2894                 }
2895                 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)
2896                         fprintf(dump, " NOT-LL");
2897                 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
2898                         fprintf(dump, " NO-ADV");
2899                 fprintf(dump, "\n");
2900         }
2901         fprintf(dump, "\n");
2902         if (dump != stderr)
2903                 fclose(dump);
2904 }
2905
2906 /*
2907  * Parse the -A (and -O) options and put corresponding filter object to the
2908  * specified interface structures.  Each of the -A/O option has the following
2909  * syntax:      -A 5f09:c400::/32,ef0,ef1  (aggregate)
2910  *              -O 5f09:c400::/32,ef0,ef1  (only when match)
2911  */
2912 static void
2913 filterconfig(void)
2914 {
2915         int i;
2916         char *p, *ap, *iflp, *ifname;
2917         struct iff ftmp, *iff_obj;
2918         struct ifc *ifcp;
2919         struct riprt *rrt;
2920 #if 0
2921         struct in6_addr gw;
2922 #endif
2923
2924         for (i = 0; i < nfilter; i++) {
2925                 ap = filter[i];
2926                 iflp = NULL;
2927                 ifcp = NULL;
2928                 if (filtertype[i] == 'N' || filtertype[i] == 'T') {
2929                         iflp = ap;
2930                         goto ifonly;
2931                 }
2932                 if ((p = strchr(ap, ',')) != NULL) {
2933                         *p++ = '\0';
2934                         iflp = p;
2935                 }
2936                 if ((p = strchr(ap, '/')) == NULL) {
2937                         fatal("no prefixlen specified for '%s'", ap);
2938                         /*NOTREACHED*/
2939                 }
2940                 *p++ = '\0';
2941                 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) {
2942                         fatal("invalid prefix specified for '%s'", ap);
2943                         /*NOTREACHED*/
2944                 }
2945                 ftmp.iff_plen = atoi(p);
2946                 ftmp.iff_next = NULL;
2947                 applyplen(&ftmp.iff_addr, ftmp.iff_plen);
2948 ifonly:
2949                 ftmp.iff_type = filtertype[i];
2950                 if (iflp == NULL || *iflp == '\0') {
2951                         fatal("no interface specified for '%s'", ap);
2952                         /*NOTREACHED*/
2953                 }
2954                 /* parse the interface listing portion */
2955                 while (iflp) {
2956                         ifname = iflp;
2957                         if ((iflp = strchr(iflp, ',')) != NULL)
2958                                 *iflp++ = '\0';
2959                         ifcp = ifc_find(ifname);
2960                         if (ifcp == NULL) {
2961                                 fatal("no interface %s exists", ifname);
2962                                 /*NOTREACHED*/
2963                         }
2964                         iff_obj = (struct iff *)malloc(sizeof(struct iff));
2965                         if (iff_obj == NULL) {
2966                                 fatal("malloc of iff_obj");
2967                                 /*NOTREACHED*/
2968                         }
2969                         memcpy((void *)iff_obj, (void *)&ftmp,
2970                             sizeof(struct iff));
2971                         /* link it to the interface filter */
2972                         iff_obj->iff_next = ifcp->ifc_filter;
2973                         ifcp->ifc_filter = iff_obj;
2974                 }
2975
2976                 /*
2977                  * -A: aggregate configuration.
2978                  */
2979                 if (filtertype[i] != 'A')
2980                         continue;
2981                 /* put the aggregate to the kernel routing table */
2982                 rrt = (struct riprt *)malloc(sizeof(struct riprt));
2983                 if (rrt == NULL) {
2984                         fatal("malloc: rrt");
2985                         /*NOTREACHED*/
2986                 }
2987                 memset(rrt, 0, sizeof(struct riprt));
2988                 rrt->rrt_info.rip6_dest = ftmp.iff_addr;
2989                 rrt->rrt_info.rip6_plen = ftmp.iff_plen;
2990                 rrt->rrt_info.rip6_metric = 1;
2991                 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2992                 rrt->rrt_gw = in6addr_loopback;
2993                 rrt->rrt_flags = RTF_UP | RTF_REJECT;
2994                 rrt->rrt_rflags = RRTF_AGGREGATE;
2995                 rrt->rrt_t = 0;
2996                 rrt->rrt_index = loopifindex;
2997 #if 0
2998                 if (getroute(&rrt->rrt_info, &gw)) {
2999 #if 0
3000                         /*
3001                          * When the address has already been registered in the
3002                          * kernel routing table, it should be removed
3003                          */
3004                         delroute(&rrt->rrt_info, &gw);
3005 #else
3006                         /* it is safer behavior */
3007                         errno = EINVAL;
3008                         fatal("%s/%u already in routing table, "
3009                             "cannot aggregate",
3010                             inet6_n2p(&rrt->rrt_info.rip6_dest),
3011                             rrt->rrt_info.rip6_plen);
3012                         /*NOTREACHED*/
3013 #endif
3014                 }
3015 #endif
3016                 /* Put the route to the list */
3017                 rrt->rrt_next = riprt;
3018                 riprt = rrt;
3019                 trace(1, "Aggregate: %s/%d for %s\n",
3020                         inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen,
3021                         ifcp->ifc_name);
3022                 /* Add this route to the kernel */
3023                 if (nflag)      /* do not modify kernel routing table */
3024                         continue;
3025                 addroute(rrt, &in6addr_loopback, loopifcp);
3026         }
3027 }
3028
3029 /***************** utility functions *****************/
3030
3031 /*
3032  * Returns a pointer to ifac whose address and prefix length matches
3033  * with the address and prefix length specified in the arguments.
3034  */
3035 static struct ifac *
3036 ifa_match(const struct ifc *ifcp, const struct in6_addr *ia, int plen)
3037 {
3038         struct ifac *ifa;
3039
3040         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
3041                 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) &&
3042                     ifa->ifa_plen == plen)
3043                         break;
3044         }
3045         return ifa;
3046 }
3047
3048 /*
3049  * Return a pointer to riprt structure whose address and prefix length
3050  * matches with the address and prefix length found in the argument.
3051  * Note: This is not a rtalloc().  Therefore exact match is necessary.
3052  */
3053 static struct riprt *
3054 rtsearch(struct netinfo6 *np, struct riprt **prev_rrt)
3055 {
3056         struct  riprt   *rrt;
3057
3058         if (prev_rrt)
3059                 *prev_rrt = NULL;
3060         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
3061                 if (rrt->rrt_info.rip6_plen == np->rip6_plen &&
3062                     IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
3063                                        &np->rip6_dest))
3064                         return rrt;
3065                 if (prev_rrt)
3066                         *prev_rrt = rrt;
3067         }
3068         if (prev_rrt)
3069                 *prev_rrt = NULL;
3070         return 0;
3071 }
3072
3073 static int
3074 sin6mask2len(const struct sockaddr_in6 *sin6)
3075 {
3076         return mask2len(&sin6->sin6_addr,
3077             sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr));
3078 }
3079
3080 static int
3081 mask2len(const struct in6_addr *addr, int lenlim)
3082 {
3083         int i = 0, j;
3084         const u_char *p = (const u_char *)addr;
3085
3086         for (j = 0; j < lenlim; j++, p++) {
3087                 if (*p != 0xff)
3088                         break;
3089                 i += 8;
3090         }
3091         if (j < lenlim) {
3092                 switch (*p) {
3093 #define MASKLEN(m, l)   case m: do { i += l; break; } while (0)
3094                 MASKLEN(0xfe, 7); break;
3095                 MASKLEN(0xfc, 6); break;
3096                 MASKLEN(0xf8, 5); break;
3097                 MASKLEN(0xf0, 4); break;
3098                 MASKLEN(0xe0, 3); break;
3099                 MASKLEN(0xc0, 2); break;
3100                 MASKLEN(0x80, 1); break;
3101 #undef  MASKLEN
3102                 }
3103         }
3104         return i;
3105 }
3106
3107 static const u_char plent[8] = {
3108         0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
3109 };
3110
3111 static void
3112 applyplen(struct in6_addr *ia, int plen)
3113 {
3114         u_char  *p;
3115         int     i;
3116
3117         p = ia->s6_addr;
3118         for (i = 0; i < 16; i++) {
3119                 if (plen <= 0)
3120                         *p = 0;
3121                 else if (plen < 8)
3122                         *p &= plent[plen];
3123                 p++, plen -= 8;
3124         }
3125 }
3126
3127 static const int pl2m[9] = {
3128         0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
3129 };
3130
3131 static struct in6_addr *
3132 plen2mask(int n)
3133 {
3134         static struct in6_addr ia;
3135         u_char  *p;
3136         int     i;
3137
3138         memset(&ia, 0, sizeof(struct in6_addr));
3139         p = (u_char *)&ia;
3140         for (i = 0; i < 16; i++, p++, n -= 8) {
3141                 if (n >= 8) {
3142                         *p = 0xff;
3143                         continue;
3144                 }
3145                 *p = pl2m[n];
3146                 break;
3147         }
3148         return &ia;
3149 }
3150
3151 static char *
3152 allocopy(char *p)
3153 {
3154         char *q = (char *)malloc(strlen(p) + 1);
3155
3156         strcpy(q, p);
3157         return q;
3158 }
3159
3160 static char *
3161 hms(void)
3162 {
3163         static char buf[BUFSIZ];
3164         time_t t;
3165         struct  tm *tm;
3166
3167         t = time(NULL);
3168         if ((tm = localtime(&t)) == NULL) {
3169                 fatal("localtime");
3170                 /*NOTREACHED*/
3171         }
3172         snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min,
3173             tm->tm_sec);
3174         return buf;
3175 }
3176
3177 #define RIPRANDDEV      1.0     /* 30 +- 15, max - min = 30 */
3178
3179 static int
3180 ripinterval(int timer)
3181 {
3182         double r = rand();
3183
3184         interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5));
3185         nextalarm = time(NULL) + interval;
3186         return interval;
3187 }
3188
3189 static void
3190 fatal(const char *fmt, ...)
3191 {
3192         va_list ap;
3193         char buf[1024];
3194
3195         va_start(ap, fmt);
3196         vsnprintf(buf, sizeof(buf), fmt, ap);
3197         va_end(ap);
3198         perror(buf);
3199         if (errno)
3200                 syslog(LOG_ERR, "%s: %s", buf, strerror(errno));
3201         else
3202                 syslog(LOG_ERR, "%s", buf);
3203         rtdexit();
3204 }
3205
3206 static void
3207 tracet(int level, const char *fmt, ...)
3208 {
3209         va_list ap;
3210
3211         va_start(ap, fmt);
3212         if (level <= dflag) {
3213                 fprintf(stderr, "%s: ", hms());
3214                 vfprintf(stderr, fmt, ap);
3215         }
3216         if (dflag) {
3217                 if (level > 0)
3218                         vsyslog(LOG_DEBUG, fmt, ap);
3219                 else
3220                         vsyslog(LOG_WARNING, fmt, ap);
3221         }
3222         va_end(ap);
3223 }
3224
3225 static void
3226 trace(int level, const char *fmt, ...)
3227 {
3228         va_list ap;
3229
3230         va_start(ap, fmt);
3231         if (level <= dflag)
3232                 vfprintf(stderr, fmt, ap);
3233         if (dflag) {
3234                 if (level > 0)
3235                         vsyslog(LOG_DEBUG, fmt, ap);
3236                 else
3237                         vsyslog(LOG_WARNING, fmt, ap);
3238         }
3239         va_end(ap);
3240 }
3241
3242 static struct ifc *
3243 ifc_find(char *name)
3244 {
3245         struct ifc *ifcp;
3246
3247         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
3248                 if (strcmp(name, ifcp->ifc_name) == 0)
3249                         return ifcp;
3250         }
3251         return NULL;
3252 }
3253
3254 static struct iff *
3255 iff_find(struct ifc *ifcp, int type)
3256 {
3257         struct iff *iffp;
3258
3259         for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
3260                 if (iffp->iff_type == type)
3261                         return iffp;
3262         }
3263         return NULL;
3264 }
3265
3266 static void
3267 setindex2ifc(int idx, struct ifc *ifcp)
3268 {
3269         int n;
3270         struct ifc **p;
3271
3272         if (!index2ifc) {
3273                 nindex2ifc = 5; /*initial guess*/
3274                 index2ifc = (struct ifc **)
3275                         malloc(sizeof(*index2ifc) * nindex2ifc);
3276                 if (index2ifc == NULL) {
3277                         fatal("malloc");
3278                         /*NOTREACHED*/
3279                 }
3280                 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc);
3281         }
3282         n = nindex2ifc;
3283         while (nindex2ifc <= idx)
3284                 nindex2ifc *= 2;
3285         if (n != nindex2ifc) {
3286                 p = (struct ifc **)realloc(index2ifc,
3287                     sizeof(*index2ifc) * nindex2ifc);
3288                 if (p == NULL) {
3289                         fatal("realloc");
3290                         /*NOTREACHED*/
3291                 }
3292                 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n));
3293                 index2ifc = p;
3294         }
3295         index2ifc[idx] = ifcp;
3296 }