usr.sbin/route6d/route6d.c

   1 /*      $FreeBSD$       */
   2 /*      $KAME: route6d.c,v 1.104 2003/10/31 00:30:20 itojun Exp $       */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef lint
  34 static char _rcsid[] = "$KAME: route6d.c,v 1.104 2003/10/31 00:30:20 itojun Exp $";
  35 #endif
  36
  37 #include <stdio.h>
  38
  39 #include <time.h>
  40 #include <unistd.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <signal.h>
  44 #ifdef __STDC__
  45 #include <stdarg.h>
  46 #else
  47 #include <varargs.h>
  48 #endif
  49 #include <syslog.h>
  50 #include <stddef.h>
  51 #include <errno.h>
  52 #include <err.h>
  53 #ifdef HAVE_POLL_H
  54 #include <poll.h>
  55 #endif
  56
  57 #include <sys/types.h>
  58 #include <sys/param.h>
  59 #include <sys/file.h>
  60 #include <sys/socket.h>
  61 #include <sys/ioctl.h>
  62 #include <sys/sysctl.h>
  63 #include <sys/uio.h>
  64 #include <net/if.h>
  65 #include <net/if_var.h>
  66 #define _KERNEL 1
  67 #include <net/route.h>
  68 #undef _KERNEL
  69 #include <netinet/in.h>
  70 #include <netinet/in_var.h>
  71 #include <netinet/ip6.h>
  72 #include <netinet/udp.h>
  73 #include <netdb.h>
  74 #include <ifaddrs.h>
  75
  76 #include <arpa/inet.h>
  77
  78 #include "route6d.h"
  79
  80 #define MAXFILTER       40
  81
  82 #ifdef  DEBUG
  83 #define INIT_INTERVAL6  6
  84 #else
  85 #define INIT_INTERVAL6  10      /* Wait to submit an initial riprequest */
  86 #endif
  87
  88 /* alignment constraint for routing socket */
  89 #define ROUNDUP(a) \
  90         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
  91 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
  92
  93 /*
  94  * Following two macros are highly depending on KAME Release
  95  */
  96 #define IN6_LINKLOCAL_IFINDEX(addr) \
  97         ((addr).s6_addr[2] << 8 | (addr).s6_addr[3])
  98
  99 #define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \
 100         do { \
 101                 (addr).s6_addr[2] = ((index) >> 8) & 0xff; \
 102                 (addr).s6_addr[3] = (index) & 0xff; \
 103         } while (0)
 104
 105 struct  ifc {                   /* Configuration of an interface */
 106         char    *ifc_name;                      /* if name */
 107         struct  ifc *ifc_next;
 108         int     ifc_index;                      /* if index */
 109         int     ifc_mtu;                        /* if mtu */
 110         int     ifc_metric;                     /* if metric */
 111         u_int   ifc_flags;                      /* flags */
 112         short   ifc_cflags;                     /* IFC_XXX */
 113         struct  in6_addr ifc_mylladdr;          /* my link-local address */
 114         struct  sockaddr_in6 ifc_ripsin;        /* rip multicast address */
 115         struct  iff *ifc_filter;                /* filter structure */
 116         struct  ifac *ifc_addr;                 /* list of AF_INET6 addresses */
 117         int     ifc_joined;                     /* joined to ff02::9 */
 118 };
 119
 120 struct  ifac {                  /* Adddress associated to an interface */
 121         struct  ifc *ifa_conf;          /* back pointer */
 122         struct  ifac *ifa_next;
 123         struct  in6_addr ifa_addr;      /* address */
 124         struct  in6_addr ifa_raddr;     /* remote address, valid in p2p */
 125         int     ifa_plen;               /* prefix length */
 126 };
 127
 128 struct  iff {
 129         int     iff_type;
 130         struct  in6_addr iff_addr;
 131         int     iff_plen;
 132         struct  iff *iff_next;
 133 };
 134
 135 struct  ifc *ifc;
 136 int     nifc;           /* number of valid ifc's */
 137 struct  ifc **index2ifc;
 138 int     nindex2ifc;
 139 struct  ifc *loopifcp = NULL;   /* pointing to loopback */
 140 #ifdef HAVE_POLL_H
 141 struct  pollfd set[2];
 142 #else
 143 fd_set  *sockvecp;      /* vector to select() for receiving */
 144 fd_set  *recvecp;
 145 int     fdmasks;
 146 int     maxfd;          /* maximum fd for select() */
 147 #endif
 148 int     rtsock;         /* the routing socket */
 149 int     ripsock;        /* socket to send/receive RIP datagram */
 150
 151 struct  rip6 *ripbuf;   /* packet buffer for sending */
 152
 153 /*
 154  * Maintain the routes in a linked list.  When the number of the routes
 155  * grows, somebody would like to introduce a hash based or a radix tree
 156  * based structure.  I believe the number of routes handled by RIP is
 157  * limited and I don't have to manage a complex data structure, however.
 158  *
 159  * One of the major drawbacks of the linear linked list is the difficulty
 160  * of representing the relationship between a couple of routes.  This may
 161  * be a significant problem when we have to support route aggregation with
 162  * supressing the specifices covered by the aggregate.
 163  */
 164
 165 struct  riprt {
 166         struct  riprt *rrt_next;        /* next destination */
 167         struct  riprt *rrt_same;        /* same destination - future use */
 168         struct  netinfo6 rrt_info;      /* network info */
 169         struct  in6_addr rrt_gw;        /* gateway */
 170         u_long  rrt_flags;              /* kernel routing table flags */
 171         u_long  rrt_rflags;             /* route6d routing table flags */
 172         time_t  rrt_t;                  /* when the route validated */
 173         int     rrt_index;              /* ifindex from which this route got */
 174 };
 175
 176 struct  riprt *riprt = 0;
 177
 178 int     dflag = 0;      /* debug flag */
 179 int     qflag = 0;      /* quiet flag */
 180 int     nflag = 0;      /* don't update kernel routing table */
 181 int     aflag = 0;      /* age out even the statically defined routes */
 182 int     hflag = 0;      /* don't split horizon */
 183 int     lflag = 0;      /* exchange site local routes */
 184 int     sflag = 0;      /* announce static routes w/ split horizon */
 185 int     Sflag = 0;      /* announce static routes to every interface */
 186 unsigned long routetag = 0;     /* route tag attached on originating case */
 187
 188 char    *filter[MAXFILTER];
 189 int     filtertype[MAXFILTER];
 190 int     nfilter = 0;
 191
 192 pid_t   pid;
 193
 194 struct  sockaddr_storage ripsin;
 195
 196 int     interval = 1;
 197 time_t  nextalarm = 0;
 198 time_t  sup_trig_update = 0;
 199
 200 FILE    *rtlog = NULL;
 201
 202 int logopened = 0;
 203
 204 static  int     seq = 0;
 205
 206 volatile sig_atomic_t seenalrm;
 207 volatile sig_atomic_t seenquit;
 208 volatile sig_atomic_t seenusr1;
 209
 210 #define RRTF_AGGREGATE          0x08000000
 211 #define RRTF_NOADVERTISE        0x10000000
 212 #define RRTF_NH_NOT_LLADDR      0x20000000
 213 #define RRTF_SENDANYWAY         0x40000000
 214 #define RRTF_CHANGED            0x80000000
 215
 216 int main __P((int, char **));
 217 void sighandler __P((int));
 218 void ripalarm __P((void));
 219 void riprecv __P((void));
 220 void ripsend __P((struct ifc *, struct sockaddr_in6 *, int));
 221 int out_filter __P((struct riprt *, struct ifc *));
 222 void init __P((void));
 223 void sockopt __P((struct ifc *));
 224 void ifconfig __P((void));
 225 void ifconfig1 __P((const char *, const struct sockaddr *, struct ifc *, int));
 226 void rtrecv __P((void));
 227 int rt_del __P((const struct sockaddr_in6 *, const struct sockaddr_in6 *,
 228         const struct sockaddr_in6 *));
 229 int rt_deladdr __P((struct ifc *, const struct sockaddr_in6 *,
 230         const struct sockaddr_in6 *));
 231 void filterconfig __P((void));
 232 int getifmtu __P((int));
 233 const char *rttypes __P((struct rt_msghdr *));
 234 const char *rtflags __P((struct rt_msghdr *));
 235 const char *ifflags __P((int));
 236 int ifrt __P((struct ifc *, int));
 237 void ifrt_p2p __P((struct ifc *, int));
 238 void applymask __P((struct in6_addr *, struct in6_addr *));
 239 void applyplen __P((struct in6_addr *, int));
 240 void ifrtdump __P((int));
 241 void ifdump __P((int));
 242 void ifdump0 __P((FILE *, const struct ifc *));
 243 void rtdump __P((int));
 244 void rt_entry __P((struct rt_msghdr *, int));
 245 void rtdexit __P((void));
 246 void riprequest __P((struct ifc *, struct netinfo6 *, int,
 247         struct sockaddr_in6 *));
 248 void ripflush __P((struct ifc *, struct sockaddr_in6 *));
 249 void sendrequest __P((struct ifc *));
 250 int sin6mask2len __P((const struct sockaddr_in6 *));
 251 int mask2len __P((const struct in6_addr *, int));
 252 int sendpacket __P((struct sockaddr_in6 *, int));
 253 int addroute __P((struct riprt *, const struct in6_addr *, struct ifc *));
 254 int delroute __P((struct netinfo6 *, struct in6_addr *));
 255 struct in6_addr *getroute __P((struct netinfo6 *, struct in6_addr *));
 256 void krtread __P((int));
 257 int tobeadv __P((struct riprt *, struct ifc *));
 258 char *allocopy __P((char *));
 259 char *hms __P((void));
 260 const char *inet6_n2p __P((const struct in6_addr *));
 261 struct ifac *ifa_match __P((const struct ifc *, const struct in6_addr *, int));
 262 struct in6_addr *plen2mask __P((int));
 263 struct riprt *rtsearch __P((struct netinfo6 *, struct riprt **));
 264 int ripinterval __P((int));
 265 time_t ripsuptrig __P((void));
 266 void fatal __P((const char *, ...))
 267         __attribute__((__format__(__printf__, 1, 2)));
 268 void trace __P((int, const char *, ...))
 269         __attribute__((__format__(__printf__, 2, 3)));
 270 void tracet __P((int, const char *, ...))
 271         __attribute__((__format__(__printf__, 2, 3)));
 272 unsigned int if_maxindex __P((void));
 273 struct ifc *ifc_find __P((char *));
 274 struct iff *iff_find __P((struct ifc *, int));
 275 void setindex2ifc __P((int, struct ifc *));
 276
 277 #define MALLOC(type)    ((type *)malloc(sizeof(type)))
 278
 279 int
 280 main(argc, argv)
 281         int     argc;
 282         char    **argv;
 283 {
 284         int     ch;
 285         int     error = 0;
 286         struct  ifc *ifcp;
 287         sigset_t mask, omask;
 288         FILE    *pidfile;
 289         char *progname;
 290         char *ep;
 291
 292         progname = strrchr(*argv, '/');
 293         if (progname)
 294                 progname++;
 295         else
 296                 progname = *argv;
 297
 298         pid = getpid();
 299         while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) {
 300                 switch (ch) {
 301                 case 'A':
 302                 case 'N':
 303                 case 'O':
 304                 case 'T':
 305                 case 'L':
 306                         if (nfilter >= MAXFILTER) {
 307                                 fatal("Exceeds MAXFILTER");
 308                                 /*NOTREACHED*/
 309                         }
 310                         filtertype[nfilter] = ch;
 311                         filter[nfilter++] = allocopy(optarg);
 312                         break;
 313                 case 't':
 314                         ep = NULL;
 315                         routetag = strtoul(optarg, &ep, 0);
 316                         if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) {
 317                                 fatal("invalid route tag");
 318                                 /*NOTREACHED*/
 319                         }
 320                         break;
 321                 case 'R':
 322                         if ((rtlog = fopen(optarg, "w")) == NULL) {
 323                                 fatal("Can not write to routelog");
 324                                 /*NOTREACHED*/
 325                         }
 326                         break;
 327 #define FLAG(c, flag, n)        case c: do { flag = n; break; } while(0)
 328                 FLAG('a', aflag, 1); break;
 329                 FLAG('d', dflag, 1); break;
 330                 FLAG('D', dflag, 2); break;
 331                 FLAG('h', hflag, 1); break;
 332                 FLAG('l', lflag, 1); break;
 333                 FLAG('n', nflag, 1); break;
 334                 FLAG('q', qflag, 1); break;
 335                 FLAG('s', sflag, 1); break;
 336                 FLAG('S', Sflag, 1); break;
 337 #undef  FLAG
 338                 default:
 339                         fatal("Invalid option specified, terminating");
 340                         /*NOTREACHED*/
 341                 }
 342         }
 343         argc -= optind;
 344         argv += optind;
 345         if (argc > 0) {
 346                 fatal("bogus extra arguments");
 347                 /*NOTREACHED*/
 348         }
 349
 350         if (geteuid()) {
 351                 nflag = 1;
 352                 fprintf(stderr, "No kernel update is allowed\n");
 353         }
 354
 355         if (dflag == 0) {
 356                 if (daemon(0, 0) < 0) {
 357                         fatal("daemon");
 358                         /*NOTREACHED*/
 359                 }
 360         }
 361
 362         openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
 363         logopened++;
 364
 365         if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL)
 366                 fatal("malloc");
 367         memset(ripbuf, 0, RIP6_MAXMTU);
 368         ripbuf->rip6_cmd = RIP6_RESPONSE;
 369         ripbuf->rip6_vers = RIP6_VERSION;
 370         ripbuf->rip6_res1[0] = 0;
 371         ripbuf->rip6_res1[1] = 0;
 372
 373         init();
 374         ifconfig();
 375         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
 376                 if (ifcp->ifc_index < 0) {
 377                         fprintf(stderr,
 378 "No ifindex found at %s (no link-local address?)\n",
 379                                 ifcp->ifc_name);
 380                         error++;
 381                 }
 382         }
 383         if (error)
 384                 exit(1);
 385         if (loopifcp == NULL) {
 386                 fatal("No loopback found");
 387                 /*NOTREACHED*/
 388         }
 389         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
 390                 ifrt(ifcp, 0);
 391         filterconfig();
 392         krtread(0);
 393         if (dflag)
 394                 ifrtdump(0);
 395
 396 #if 1
 397         pid = getpid();
 398         if ((pidfile = fopen(ROUTE6D_PID, "w")) != NULL) {
 399                 fprintf(pidfile, "%d\n", pid);
 400                 fclose(pidfile);
 401         }
 402 #endif
 403
 404         if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) {
 405                 fatal("malloc");
 406                 /*NOTREACHED*/
 407         }
 408         memset(ripbuf, 0, RIP6_MAXMTU);
 409         ripbuf->rip6_cmd = RIP6_RESPONSE;
 410         ripbuf->rip6_vers = RIP6_VERSION;
 411         ripbuf->rip6_res1[0] = 0;
 412         ripbuf->rip6_res1[1] = 0;
 413
 414         if (signal(SIGALRM, sighandler) == SIG_ERR ||
 415             signal(SIGQUIT, sighandler) == SIG_ERR ||
 416             signal(SIGTERM, sighandler) == SIG_ERR ||
 417             signal(SIGUSR1, sighandler) == SIG_ERR ||
 418             signal(SIGHUP, sighandler) == SIG_ERR ||
 419             signal(SIGINT, sighandler) == SIG_ERR) {
 420                 fatal("signal");
 421                 /*NOTREACHED*/
 422         }
 423         /*
 424          * To avoid rip packet congestion (not on a cable but in this
 425          * process), wait for a moment to send the first RIP6_RESPONSE
 426          * packets.
 427          */
 428         alarm(ripinterval(INIT_INTERVAL6));
 429
 430         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
 431                 if (iff_find(ifcp, 'N'))
 432                         continue;
 433                 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
 434                         sendrequest(ifcp);
 435         }
 436
 437         syslog(LOG_INFO, "**** Started ****");
 438         sigemptyset(&mask);
 439         sigaddset(&mask, SIGALRM);
 440         while (1) {
 441                 if (seenalrm) {
 442                         ripalarm();
 443                         seenalrm = 0;
 444                         continue;
 445                 }
 446                 if (seenquit) {
 447                         rtdexit();
 448                         seenquit = 0;
 449                         continue;
 450                 }
 451                 if (seenusr1) {
 452                         ifrtdump(SIGUSR1);
 453                         seenusr1 = 0;
 454                         continue;
 455                 }
 456
 457 #ifdef HAVE_POLL_H
 458                 switch (poll(set, 2, INFTIM))
 459 #else
 460                 memcpy(recvecp, sockvecp, fdmasks);
 461                 switch (select(maxfd + 1, recvecp, 0, 0, 0))
 462 #endif
 463                 {
 464                 case -1:
 465                         if (errno != EINTR) {
 466                                 fatal("select");
 467                                 /*NOTREACHED*/
 468                         }
 469                         continue;
 470                 case 0:
 471                         continue;
 472                 default:
 473 #ifdef HAVE_POLL_H
 474                         if (set[0].revents & POLLIN)
 475 #else
 476                         if (FD_ISSET(ripsock, recvecp))
 477 #endif
 478                         {
 479                                 sigprocmask(SIG_BLOCK, &mask, &omask);
 480                                 riprecv();
 481                                 sigprocmask(SIG_SETMASK, &omask, NULL);
 482                         }
 483 #ifdef HAVE_POLL_H
 484                         if (set[1].revents & POLLIN)
 485 #else
 486                         if (FD_ISSET(rtsock, recvecp))
 487 #endif
 488                         {
 489                                 sigprocmask(SIG_BLOCK, &mask, &omask);
 490                                 rtrecv();
 491                                 sigprocmask(SIG_SETMASK, &omask, NULL);
 492                         }
 493                 }
 494         }
 495 }
 496
 497 void
 498 sighandler(signo)
 499         int signo;
 500 {
 501
 502         switch (signo) {
 503         case SIGALRM:
 504                 seenalrm++;
 505                 break;
 506         case SIGQUIT:
 507         case SIGTERM:
 508                 seenquit++;
 509                 break;
 510         case SIGUSR1:
 511         case SIGHUP:
 512         case SIGINT:
 513                 seenusr1++;
 514                 break;
 515         }
 516 }
 517
 518 /*
 519  * gracefully exits after resetting sockopts.
 520  */
 521 /* ARGSUSED */
 522 void
 523 rtdexit()
 524 {
 525         struct  riprt *rrt;
 526
 527         alarm(0);
 528         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
 529                 if (rrt->rrt_rflags & RRTF_AGGREGATE) {
 530                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
 531                 }
 532         }
 533         close(ripsock);
 534         close(rtsock);
 535         syslog(LOG_INFO, "**** Terminated ****");
 536         closelog();
 537         exit(1);
 538 }
 539
 540 /*
 541  * Called periodically:
 542  *      1. age out the learned route. remove it if necessary.
 543  *      2. submit RIP6_RESPONSE packets.
 544  * Invoked in every SUPPLY_INTERVAL6 (30) seconds.  I believe we don't have
 545  * to invoke this function in every 1 or 5 or 10 seconds only to age the
 546  * routes more precisely.
 547  */
 548 /* ARGSUSED */
 549 void
 550 ripalarm()
 551 {
 552         struct  ifc *ifcp;
 553         struct  riprt *rrt, *rrt_prev, *rrt_next;
 554         time_t  t_lifetime, t_holddown;
 555
 556         /* age the RIP routes */
 557         rrt_prev = 0;
 558         t_lifetime = time(NULL) - RIP_LIFETIME;
 559         t_holddown = t_lifetime - RIP_HOLDDOWN;
 560         for (rrt = riprt; rrt; rrt = rrt_next) {
 561                 rrt_next = rrt->rrt_next;
 562
 563                 if (rrt->rrt_t == 0) {
 564                         rrt_prev = rrt;
 565                         continue;
 566                 }
 567                 if (rrt->rrt_t < t_holddown) {
 568                         if (rrt_prev) {
 569                                 rrt_prev->rrt_next = rrt->rrt_next;
 570                         } else {
 571                                 riprt = rrt->rrt_next;
 572                         }
 573                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
 574                         free(rrt);
 575                         continue;
 576                 }
 577                 if (rrt->rrt_t < t_lifetime)
 578                         rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
 579                 rrt_prev = rrt;
 580         }
 581         /* Supply updates */
 582         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
 583                 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
 584                         ripsend(ifcp, &ifcp->ifc_ripsin, 0);
 585         }
 586         alarm(ripinterval(SUPPLY_INTERVAL6));
 587 }
 588
 589 void
 590 init()
 591 {
 592         int     error;
 593         const int int0 = 0, int1 = 1, int255 = 255;
 594         struct  addrinfo hints, *res;
 595         char    port[NI_MAXSERV];
 596
 597         ifc = (struct ifc *)NULL;
 598         nifc = 0;
 599         nindex2ifc = 0; /*initial guess*/
 600         index2ifc = NULL;
 601         snprintf(port, sizeof(port), "%u", RIP6_PORT);
 602
 603         memset(&hints, 0, sizeof(hints));
 604         hints.ai_family = PF_INET6;
 605         hints.ai_socktype = SOCK_DGRAM;
 606         hints.ai_protocol = IPPROTO_UDP;
 607         hints.ai_flags = AI_PASSIVE;
 608         error = getaddrinfo(NULL, port, &hints, &res);
 609         if (error) {
 610                 fatal("%s", gai_strerror(error));
 611                 /*NOTREACHED*/
 612         }
 613         if (res->ai_next) {
 614                 fatal(":: resolved to multiple address");
 615                 /*NOTREACHED*/
 616         }
 617
 618         ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
 619         if (ripsock < 0) {
 620                 fatal("rip socket");
 621                 /*NOTREACHED*/
 622         }
 623 #ifdef IPV6_V6ONLY
 624         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_V6ONLY,
 625             &int1, sizeof(int1)) < 0) {
 626                 fatal("rip IPV6_V6ONLY");
 627                 /*NOTREACHED*/
 628         }
 629 #endif
 630         if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) {
 631                 fatal("rip bind");
 632                 /*NOTREACHED*/
 633         }
 634         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
 635             &int255, sizeof(int255)) < 0) {
 636                 fatal("rip IPV6_MULTICAST_HOPS");
 637                 /*NOTREACHED*/
 638         }
 639         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
 640             &int0, sizeof(int0)) < 0) {
 641                 fatal("rip IPV6_MULTICAST_LOOP");
 642                 /*NOTREACHED*/
 643         }
 644
 645 #ifdef IPV6_RECVPKTINFO
 646         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO,
 647             &int1, sizeof(int1)) < 0) {
 648                 fatal("rip IPV6_RECVPKTINFO");
 649                 /*NOTREACHED*/
 650         }
 651 #else  /* old adv. API */
 652         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO,
 653             &int1, sizeof(int1)) < 0) {
 654                 fatal("rip IPV6_PKTINFO");
 655                 /*NOTREACHED*/
 656         }
 657 #endif
 658
 659 #ifdef IPV6_RECVPKTINFO
 660         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
 661             &int1, sizeof(int1)) < 0) {
 662                 fatal("rip IPV6_RECVHOPLIMIT");
 663                 /*NOTREACHED*/
 664         }
 665 #else  /* old adv. API */
 666         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_HOPLIMIT,
 667             &int1, sizeof(int1)) < 0) {
 668                 fatal("rip IPV6_HOPLIMIT");
 669                 /*NOTREACHED*/
 670         }
 671 #endif
 672
 673         memset(&hints, 0, sizeof(hints));
 674         hints.ai_family = PF_INET6;
 675         hints.ai_socktype = SOCK_DGRAM;
 676         hints.ai_protocol = IPPROTO_UDP;
 677         error = getaddrinfo(RIP6_DEST, port, &hints, &res);
 678         if (error) {
 679                 fatal("%s", gai_strerror(error));
 680                 /*NOTREACHED*/
 681         }
 682         if (res->ai_next) {
 683                 fatal("%s resolved to multiple address", RIP6_DEST);
 684                 /*NOTREACHED*/
 685         }
 686         memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
 687
 688 #ifdef HAVE_POLL_H
 689         set[0].fd = ripsock;
 690         set[0].events = POLLIN;
 691 #else
 692         maxfd = ripsock;
 693 #endif
 694
 695         if (nflag == 0) {
 696                 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
 697                         fatal("route socket");
 698                         /*NOTREACHED*/
 699                 }
 700 #ifdef HAVE_POLL_H
 701                 set[1].fd = rtsock;
 702                 set[1].events = POLLIN;
 703 #else
 704                 if (rtsock > maxfd)
 705                         maxfd = rtsock;
 706 #endif
 707         } else {
 708 #ifdef HAVE_POLL_H
 709                 set[1].fd = -1;
 710 #else
 711                 rtsock = -1;    /*just for safety */
 712 #endif
 713         }
 714
 715 #ifndef HAVE_POLL_H
 716         fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask);
 717         if ((sockvecp = malloc(fdmasks)) == NULL) {
 718                 fatal("malloc");
 719                 /*NOTREACHED*/
 720         }
 721         if ((recvecp = malloc(fdmasks)) == NULL) {
 722                 fatal("malloc");
 723                 /*NOTREACHED*/
 724         }
 725         memset(sockvecp, 0, fdmasks);
 726         FD_SET(ripsock, sockvecp);
 727         if (rtsock >= 0)
 728                 FD_SET(rtsock, sockvecp);
 729 #endif
 730 }
 731
 732 #define RIPSIZE(n) \
 733         (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6))
 734
 735 /*
 736  * ripflush flushes the rip datagram stored in the rip buffer
 737  */
 738 static int nrt;
 739 static struct netinfo6 *np;
 740
 741 void
 742 ripflush(ifcp, sin6)
 743         struct ifc *ifcp;
 744         struct sockaddr_in6 *sin6;
 745 {
 746         int i;
 747         int error;
 748
 749         if (ifcp)
 750                 tracet(1, "Send(%s): info(%d) to %s.%d\n",
 751                         ifcp->ifc_name, nrt,
 752                         inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port));
 753         else
 754                 tracet(1, "Send: info(%d) to %s.%d\n",
 755                         nrt, inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port));
 756         if (dflag >= 2) {
 757                 np = ripbuf->rip6_nets;
 758                 for (i = 0; i < nrt; i++, np++) {
 759                         if (np->rip6_metric == NEXTHOP_METRIC) {
 760                                 if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest))
 761                                         trace(2, "    NextHop reset");
 762                                 else {
 763                                         trace(2, "    NextHop %s",
 764                                                 inet6_n2p(&np->rip6_dest));
 765                                 }
 766                         } else {
 767                                 trace(2, "    %s/%d[%d]",
 768                                         inet6_n2p(&np->rip6_dest),
 769                                         np->rip6_plen, np->rip6_metric);
 770                         }
 771                         if (np->rip6_tag) {
 772                                 trace(2, "  tag=0x%04x",
 773                                         ntohs(np->rip6_tag) & 0xffff);
 774                         }
 775                         trace(2, "\n");
 776                 }
 777         }
 778         error = sendpacket(sin6, RIPSIZE(nrt));
 779         if (error == EAFNOSUPPORT) {
 780                 /* Protocol not supported */
 781                 tracet(1, "Could not send info to %s (%s): "
 782                         "set IFF_UP to 0\n",
 783                         ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
 784                 ifcp->ifc_flags &= ~IFF_UP;     /* As if down for AF_INET6 */
 785         }
 786         nrt = 0; np = ripbuf->rip6_nets;
 787 }
 788
 789 /*
 790  * Generate RIP6_RESPONSE packets and send them.
 791  */
 792 void
 793 ripsend(ifcp, sin6, flag)
 794         struct  ifc *ifcp;
 795         struct  sockaddr_in6 *sin6;
 796         int flag;
 797 {
 798         struct  riprt *rrt;
 799         struct  in6_addr *nh;   /* next hop */
 800         int     maxrte;
 801
 802         if (qflag)
 803                 return;
 804
 805         if (ifcp == NULL) {
 806                 /*
 807                  * Request from non-link local address is not
 808                  * a regular route6d update.
 809                  */
 810                 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) -
 811                                 sizeof(struct udphdr) -
 812                                 sizeof(struct rip6) + sizeof(struct netinfo6)) /
 813                                 sizeof(struct netinfo6);
 814                 nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
 815                 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
 816                         if (rrt->rrt_rflags & RRTF_NOADVERTISE)
 817                                 continue;
 818                         /* Put the route to the buffer */
 819                         *np = rrt->rrt_info;
 820                         np++; nrt++;
 821                         if (nrt == maxrte) {
 822                                 ripflush(NULL, sin6);
 823                                 nh = NULL;
 824                         }
 825                 }
 826                 if (nrt)        /* Send last packet */
 827                         ripflush(NULL, sin6);
 828                 return;
 829         }
 830
 831         if ((flag & RRTF_SENDANYWAY) == 0 &&
 832             (qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
 833                 return;
 834
 835         /* -N: no use */
 836         if (iff_find(ifcp, 'N') != NULL)
 837                 return;
 838
 839         /* -T: generate default route only */
 840         if (iff_find(ifcp, 'T') != NULL) {
 841                 struct netinfo6 rrt_info;
 842                 memset(&rrt_info, 0, sizeof(struct netinfo6));
 843                 rrt_info.rip6_dest = in6addr_any;
 844                 rrt_info.rip6_plen = 0;
 845                 rrt_info.rip6_metric = 1;
 846                 rrt_info.rip6_metric += ifcp->ifc_metric;
 847                 rrt_info.rip6_tag = htons(routetag & 0xffff);
 848                 np = ripbuf->rip6_nets;
 849                 *np = rrt_info;
 850                 nrt = 1;
 851                 ripflush(ifcp, sin6);
 852                 return;
 853         }
 854
 855         maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) -
 856                         sizeof(struct udphdr) -
 857                         sizeof(struct rip6) + sizeof(struct netinfo6)) /
 858                         sizeof(struct netinfo6);
 859
 860         nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
 861         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
 862                 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
 863                         continue;
 864
 865                 /* Need to check filter here */
 866                 if (out_filter(rrt, ifcp) == 0)
 867                         continue;
 868
 869                 /* Check split horizon and other conditions */
 870                 if (tobeadv(rrt, ifcp) == 0)
 871                         continue;
 872
 873                 /* Only considers the routes with flag if specified */
 874                 if ((flag & RRTF_CHANGED) &&
 875                     (rrt->rrt_rflags & RRTF_CHANGED) == 0)
 876                         continue;
 877
 878                 /* Check nexthop */
 879                 if (rrt->rrt_index == ifcp->ifc_index &&
 880                     !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) &&
 881                     (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) {
 882                         if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) {
 883                                 if (nrt == maxrte - 2)
 884                                         ripflush(ifcp, sin6);
 885                                 np->rip6_dest = rrt->rrt_gw;
 886                                 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest))
 887                                         SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0);
 888                                 np->rip6_plen = 0;
 889                                 np->rip6_tag = 0;
 890                                 np->rip6_metric = NEXTHOP_METRIC;
 891                                 nh = &rrt->rrt_gw;
 892                                 np++; nrt++;
 893                         }
 894                 } else if (nh && (rrt->rrt_index != ifcp->ifc_index ||
 895                                   !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) ||
 896                                   rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) {
 897                         /* Reset nexthop */
 898                         if (nrt == maxrte - 2)
 899                                 ripflush(ifcp, sin6);
 900                         memset(np, 0, sizeof(struct netinfo6));
 901                         np->rip6_metric = NEXTHOP_METRIC;
 902                         nh = NULL;
 903                         np++; nrt++;
 904                 }
 905
 906                 /* Put the route to the buffer */
 907                 *np = rrt->rrt_info;
 908                 np++; nrt++;
 909                 if (nrt == maxrte) {
 910                         ripflush(ifcp, sin6);
 911                         nh = NULL;
 912                 }
 913         }
 914         if (nrt)        /* Send last packet */
 915                 ripflush(ifcp, sin6);
 916 }
 917
 918 /*
 919  * outbound filter logic, per-route/interface.
 920  */
 921 int
 922 out_filter(rrt, ifcp)
 923         struct riprt *rrt;
 924         struct ifc *ifcp;
 925 {
 926         struct iff *iffp;
 927         struct in6_addr ia;
 928         int ok;
 929
 930         /*
 931          * -A: filter out less specific routes, if we have aggregated
 932          * route configured.
 933          */
 934         for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
 935                 if (iffp->iff_type != 'A')
 936                         continue;
 937                 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen)
 938                         continue;
 939                 ia = rrt->rrt_info.rip6_dest;
 940                 applyplen(&ia, iffp->iff_plen);
 941                 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr))
 942                         return 0;
 943         }
 944
 945         /*
 946          * if it is an aggregated route, advertise it only to the
 947          * interfaces specified on -A.
 948          */
 949         if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) {
 950                 ok = 0;
 951                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
 952                         if (iffp->iff_type != 'A')
 953                                 continue;
 954                         if (rrt->rrt_info.rip6_plen == iffp->iff_plen &&
 955                             IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
 956                             &iffp->iff_addr)) {
 957                                 ok = 1;
 958                                 break;
 959                         }
 960                 }
 961                 if (!ok)
 962                         return 0;
 963         }
 964
 965         /*
 966          * -O: advertise only if prefix matches the configured prefix.
 967          */
 968         if (iff_find(ifcp, 'O')) {
 969                 ok = 0;
 970                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
 971                         if (iffp->iff_type != 'O')
 972                                 continue;
 973                         if (rrt->rrt_info.rip6_plen < iffp->iff_plen)
 974                                 continue;
 975                         ia = rrt->rrt_info.rip6_dest;
 976                         applyplen(&ia, iffp->iff_plen);
 977                         if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
 978                                 ok = 1;
 979                                 break;
 980                         }
 981                 }
 982                 if (!ok)
 983                         return 0;
 984         }
 985
 986         /* the prefix should be advertised */
 987         return 1;
 988 }
 989
 990 /*
 991  * Determine if the route is to be advertised on the specified interface.
 992  * It checks options specified in the arguments and the split horizon rule.
 993  */
 994 int
 995 tobeadv(rrt, ifcp)
 996         struct riprt *rrt;
 997         struct ifc *ifcp;
 998 {
 999
1000         /* Special care for static routes */
1001         if (rrt->rrt_flags & RTF_STATIC) {
1002                 /* XXX don't advertise reject/blackhole routes */
1003                 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE))
1004                         return 0;
1005
1006                 if (Sflag)      /* Yes, advertise it anyway */
1007                         return 1;
1008                 if (sflag && rrt->rrt_index != ifcp->ifc_index)
1009                         return 1;
1010                 return 0;
1011         }
1012         /* Regular split horizon */
1013         if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index)
1014                 return 0;
1015         return 1;
1016 }
1017
1018 /*
1019  * Send a rip packet actually.
1020  */
1021 int
1022 sendpacket(sin6, len)
1023         struct  sockaddr_in6 *sin6;
1024         int     len;
1025 {
1026         struct msghdr m;
1027         struct cmsghdr *cm;
1028         struct iovec iov[2];
1029         u_char cmsgbuf[256];
1030         struct in6_pktinfo *pi;
1031         int idx;
1032         struct sockaddr_in6 sincopy;
1033
1034         /* do not overwrite the given sin */
1035         sincopy = *sin6;
1036         sin6 = &sincopy;
1037
1038         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
1039             IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
1040                 /* XXX: do not mix the interface index and link index */
1041                 idx = IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr);
1042                 SET_IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr, 0);
1043                 sin6->sin6_scope_id = idx;
1044         } else
1045                 idx = 0;
1046
1047         m.msg_name = (caddr_t)sin6;
1048         m.msg_namelen = sizeof(*sin6);
1049         iov[0].iov_base = (caddr_t)ripbuf;
1050         iov[0].iov_len = len;
1051         m.msg_iov = iov;
1052         m.msg_iovlen = 1;
1053         if (!idx) {
1054                 m.msg_control = NULL;
1055                 m.msg_controllen = 0;
1056         } else {
1057                 memset(cmsgbuf, 0, sizeof(cmsgbuf));
1058                 cm = (struct cmsghdr *)cmsgbuf;
1059                 m.msg_control = (caddr_t)cm;
1060                 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
1061
1062                 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1063                 cm->cmsg_level = IPPROTO_IPV6;
1064                 cm->cmsg_type = IPV6_PKTINFO;
1065                 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
1066                 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/
1067                 pi->ipi6_ifindex = idx;
1068         }
1069
1070         if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) {
1071                 trace(1, "sendmsg: %s\n", strerror(errno));
1072                 return errno;
1073         }
1074
1075         return 0;
1076 }
1077
1078 /*
1079  * Receive and process RIP packets.  Update the routes/kernel forwarding
1080  * table if necessary.
1081  */
1082 void
1083 riprecv()
1084 {
1085         struct  ifc *ifcp, *ic;
1086         struct  sockaddr_in6 fsock;
1087         struct  in6_addr nh;    /* next hop */
1088         struct  rip6 *rp;
1089         struct  netinfo6 *np, *nq;
1090         struct  riprt *rrt;
1091         ssize_t len, nn;
1092         unsigned int need_trigger, idx;
1093         char    buf[4 * RIP6_MAXMTU];
1094         time_t  t;
1095         struct msghdr m;
1096         struct cmsghdr *cm;
1097         struct iovec iov[2];
1098         u_char cmsgbuf[256];
1099         struct in6_pktinfo *pi = NULL;
1100         int *hlimp = NULL;
1101         struct iff *iffp;
1102         struct in6_addr ia;
1103         int ok;
1104         time_t t_half_lifetime;
1105
1106         need_trigger = 0;
1107
1108         m.msg_name = (caddr_t)&fsock;
1109         m.msg_namelen = sizeof(fsock);
1110         iov[0].iov_base = (caddr_t)buf;
1111         iov[0].iov_len = sizeof(buf);
1112         m.msg_iov = iov;
1113         m.msg_iovlen = 1;
1114         cm = (struct cmsghdr *)cmsgbuf;
1115         m.msg_control = (caddr_t)cm;
1116         m.msg_controllen = sizeof(cmsgbuf);
1117         if ((len = recvmsg(ripsock, &m, 0)) < 0) {
1118                 fatal("recvmsg");
1119                 /*NOTREACHED*/
1120         }
1121         idx = 0;
1122         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
1123              cm;
1124              cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
1125                 if (cm->cmsg_level != IPPROTO_IPV6)
1126                     continue;
1127                 switch (cm->cmsg_type) {
1128                 case IPV6_PKTINFO:
1129                         if (cm->cmsg_len != CMSG_LEN(sizeof(*pi))) {
1130                                 trace(1,
1131                                     "invalid cmsg length for IPV6_PKTINFO\n");
1132                                 return;
1133                         }
1134                         pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
1135                         idx = pi->ipi6_ifindex;
1136                         break;
1137                 case IPV6_HOPLIMIT:
1138                         if (cm->cmsg_len != CMSG_LEN(sizeof(int))) {
1139                                 trace(1,
1140                                     "invalid cmsg length for IPV6_HOPLIMIT\n");
1141                                 return;
1142                         }
1143                         hlimp = (int *)CMSG_DATA(cm);
1144                         break;
1145                 }
1146         }
1147         if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr))
1148                 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx);
1149
1150         if (len < sizeof(struct rip6)) {
1151                 trace(1, "Packet too short\n");
1152                 return;
1153         }
1154
1155         if (pi == NULL || hlimp == NULL) {
1156                 /*
1157                  * This can happen when the kernel failed to allocate memory
1158                  * for the ancillary data.  Although we might be able to handle
1159                  * some cases without this info, those are minor and not so
1160                  * important, so it's better to discard the packet for safer
1161                  * operation.
1162                  */
1163                 trace(1, "IPv6 packet information cannot be retrieved\n");
1164                 return;
1165         }
1166
1167         nh = fsock.sin6_addr;
1168         nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) /
1169                 sizeof(struct netinfo6);
1170         rp = (struct rip6 *)buf;
1171         np = rp->rip6_nets;
1172
1173         if (rp->rip6_vers != RIP6_VERSION) {
1174                 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers);
1175                 return;
1176         }
1177         if (rp->rip6_cmd == RIP6_REQUEST) {
1178                 if (idx && idx < nindex2ifc) {
1179                         ifcp = index2ifc[idx];
1180                         riprequest(ifcp, np, nn, &fsock);
1181                 } else {
1182                         riprequest(NULL, np, nn, &fsock);
1183                 }
1184                 return;
1185         }
1186
1187         if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) {
1188                 trace(1, "Response from non-ll addr: %s\n",
1189                     inet6_n2p(&fsock.sin6_addr));
1190                 return;         /* Ignore packets from non-link-local addr */
1191         }
1192         if (ntohs(fsock.sin6_port) != RIP6_PORT) {
1193                 trace(1, "Response from non-rip port from %s\n",
1194                     inet6_n2p(&fsock.sin6_addr));
1195                 return;
1196         }
1197         if (IN6_IS_ADDR_MULTICAST(&pi->ipi6_addr) && *hlimp != 255) {
1198                 trace(1,
1199                     "Response packet with a smaller hop limit (%d) from %s\n",
1200                     *hlimp, inet6_n2p(&fsock.sin6_addr));
1201                 return;
1202         }
1203         /*
1204          * Further validation: since this program does not send off-link
1205          * requests, an incoming response must always come from an on-link
1206          * node.  Although this is normally ensured by the source address
1207          * check above, it may not 100% be safe because there are router
1208          * implementations that (invalidly) allow a packet with a link-local
1209          * source address to be forwarded to a different link.
1210          * So we also check whether the destination address is a link-local
1211          * address or the hop limit is 255.  Note that RFC2080 does not require
1212          * the specific hop limit for a unicast response, so we cannot assume
1213          * the limitation.
1214          */
1215         if (!IN6_IS_ADDR_LINKLOCAL(&pi->ipi6_addr) && *hlimp != 255) {
1216                 trace(1,
1217                     "Response packet possibly from an off-link node: "
1218                     "from %s to %s hlim=%d\n",
1219                     inet6_n2p(&fsock.sin6_addr),
1220                     inet6_n2p(&pi->ipi6_addr), *hlimp);
1221                 return;
1222         }
1223
1224         idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr);
1225         ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL;
1226         if (!ifcp) {
1227                 trace(1, "Packets to unknown interface index %d\n", idx);
1228                 return;         /* Ignore it */
1229         }
1230         if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr))
1231                 return;         /* The packet is from me; ignore */
1232         if (rp->rip6_cmd != RIP6_RESPONSE) {
1233                 trace(1, "Invalid command %d\n", rp->rip6_cmd);
1234                 return;
1235         }
1236
1237         /* -N: no use */
1238         if (iff_find(ifcp, 'N') != NULL)
1239                 return;
1240
1241         tracet(1, "Recv(%s): from %s.%d info(%d)\n",
1242             ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn);
1243
1244         t = time(NULL);
1245         t_half_lifetime = t - (RIP_LIFETIME/2);
1246         for (; nn; nn--, np++) {
1247                 if (np->rip6_metric == NEXTHOP_METRIC) {
1248                         /* modify neighbor address */
1249                         if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1250                                 nh = np->rip6_dest;
1251                                 SET_IN6_LINKLOCAL_IFINDEX(nh, idx);
1252                                 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1253                         } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) {
1254                                 nh = fsock.sin6_addr;
1255                                 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1256                         } else {
1257                                 nh = fsock.sin6_addr;
1258                                 trace(1, "\tInvalid Nexthop: %s\n",
1259                                     inet6_n2p(&np->rip6_dest));
1260                         }
1261                         continue;
1262                 }
1263                 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) {
1264                         trace(1, "\tMulticast netinfo6: %s/%d [%d]\n",
1265                                 inet6_n2p(&np->rip6_dest),
1266                                 np->rip6_plen, np->rip6_metric);
1267                         continue;
1268                 }
1269                 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) {
1270                         trace(1, "\tLoopback netinfo6: %s/%d [%d]\n",
1271                                 inet6_n2p(&np->rip6_dest),
1272                                 np->rip6_plen, np->rip6_metric);
1273                         continue;
1274                 }
1275                 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1276                         trace(1, "\tLink Local netinfo6: %s/%d [%d]\n",
1277                                 inet6_n2p(&np->rip6_dest),
1278                                 np->rip6_plen, np->rip6_metric);
1279                         continue;
1280                 }
1281                 /* may need to pass sitelocal prefix in some case, however*/
1282                 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) {
1283                         trace(1, "\tSite Local netinfo6: %s/%d [%d]\n",
1284                                 inet6_n2p(&np->rip6_dest),
1285                                 np->rip6_plen, np->rip6_metric);
1286                         continue;
1287                 }
1288                 trace(2, "\tnetinfo6: %s/%d [%d]",
1289                         inet6_n2p(&np->rip6_dest),
1290                         np->rip6_plen, np->rip6_metric);
1291                 if (np->rip6_tag)
1292                         trace(2, "  tag=0x%04x", ntohs(np->rip6_tag) & 0xffff);
1293                 if (dflag >= 2) {
1294                         ia = np->rip6_dest;
1295                         applyplen(&ia, np->rip6_plen);
1296                         if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest))
1297                                 trace(2, " [junk outside prefix]");
1298                 }
1299
1300                 /*
1301                  * -L: listen only if the prefix matches the configuration
1302                  */
1303                 ok = 1;         /* if there's no L filter, it is ok */
1304                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
1305                         if (iffp->iff_type != 'L')
1306                                 continue;
1307                         ok = 0;
1308                         if (np->rip6_plen < iffp->iff_plen)
1309                                 continue;
1310                         /* special rule: ::/0 means default, not "in /0" */
1311                         if (iffp->iff_plen == 0 && np->rip6_plen > 0)
1312                                 continue;
1313                         ia = np->rip6_dest;
1314                         applyplen(&ia, iffp->iff_plen);
1315                         if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
1316                                 ok = 1;
1317                                 break;
1318                         }
1319                 }
1320                 if (!ok) {
1321                         trace(2, "  (filtered)\n");
1322                         continue;
1323                 }
1324
1325                 trace(2, "\n");
1326                 np->rip6_metric++;
1327                 np->rip6_metric += ifcp->ifc_metric;
1328                 if (np->rip6_metric > HOPCNT_INFINITY6)
1329                         np->rip6_metric = HOPCNT_INFINITY6;
1330
1331                 applyplen(&np->rip6_dest, np->rip6_plen);
1332                 if ((rrt = rtsearch(np, NULL)) != NULL) {
1333                         if (rrt->rrt_t == 0)
1334                                 continue;       /* Intf route has priority */
1335                         nq = &rrt->rrt_info;
1336                         if (nq->rip6_metric > np->rip6_metric) {
1337                                 if (rrt->rrt_index == ifcp->ifc_index &&
1338                                     IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1339                                         /* Small metric from the same gateway */
1340                                         nq->rip6_metric = np->rip6_metric;
1341                                 } else {
1342                                         /* Better route found */
1343                                         rrt->rrt_index = ifcp->ifc_index;
1344                                         /* Update routing table */
1345                                         delroute(nq, &rrt->rrt_gw);
1346                                         rrt->rrt_gw = nh;
1347                                         *nq = *np;
1348                                         addroute(rrt, &nh, ifcp);
1349                                 }
1350                                 rrt->rrt_rflags |= RRTF_CHANGED;
1351                                 rrt->rrt_t = t;
1352                                 need_trigger = 1;
1353                         } else if (nq->rip6_metric < np->rip6_metric &&
1354                                    rrt->rrt_index == ifcp->ifc_index &&
1355                                    IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1356                                 /* Got worse route from same gw */
1357                                 nq->rip6_metric = np->rip6_metric;
1358                                 rrt->rrt_t = t;
1359                                 rrt->rrt_rflags |= RRTF_CHANGED;
1360                                 need_trigger = 1;
1361                         } else if (nq->rip6_metric == np->rip6_metric &&
1362                                    np->rip6_metric < HOPCNT_INFINITY6) {
1363                                 if (rrt->rrt_index == ifcp->ifc_index &&
1364                                    IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1365                                         /* same metric, same route from same gw */
1366                                         rrt->rrt_t = t;
1367                                 } else if (rrt->rrt_t < t_half_lifetime) {
1368                                         /* Better route found */
1369                                         rrt->rrt_index = ifcp->ifc_index;
1370                                         /* Update routing table */
1371                                         delroute(nq, &rrt->rrt_gw);
1372                                         rrt->rrt_gw = nh;
1373                                         *nq = *np;
1374                                         addroute(rrt, &nh, ifcp);
1375                                         rrt->rrt_rflags |= RRTF_CHANGED;
1376                                         rrt->rrt_t = t;
1377                                 }
1378                         }
1379                         /*
1380                          * if nq->rip6_metric == HOPCNT_INFINITY6 then
1381                          * do not update age value.  Do nothing.
1382                          */
1383                 } else if (np->rip6_metric < HOPCNT_INFINITY6) {
1384                         /* Got a new valid route */
1385                         if ((rrt = MALLOC(struct riprt)) == NULL) {
1386                                 fatal("malloc: struct riprt");
1387                                 /*NOTREACHED*/
1388                         }
1389                         memset(rrt, 0, sizeof(*rrt));
1390                         nq = &rrt->rrt_info;
1391
1392                         rrt->rrt_same = NULL;
1393                         rrt->rrt_index = ifcp->ifc_index;
1394                         rrt->rrt_flags = RTF_UP|RTF_GATEWAY;
1395                         rrt->rrt_gw = nh;
1396                         *nq = *np;
1397                         applyplen(&nq->rip6_dest, nq->rip6_plen);
1398                         if (nq->rip6_plen == sizeof(struct in6_addr) * 8)
1399                                 rrt->rrt_flags |= RTF_HOST;
1400
1401                         /* Put the route to the list */
1402                         rrt->rrt_next = riprt;
1403                         riprt = rrt;
1404                         /* Update routing table */
1405                         addroute(rrt, &nh, ifcp);
1406                         rrt->rrt_rflags |= RRTF_CHANGED;
1407                         need_trigger = 1;
1408                         rrt->rrt_t = t;
1409                 }
1410         }
1411         /* XXX need to care the interval between triggered updates */
1412         if (need_trigger) {
1413                 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) {
1414                         for (ic = ifc; ic; ic = ic->ifc_next) {
1415                                 if (ifcp->ifc_index == ic->ifc_index)
1416                                         continue;
1417                                 if (ic->ifc_flags & IFF_UP)
1418                                         ripsend(ic, &ic->ifc_ripsin,
1419                                                 RRTF_CHANGED);
1420                         }
1421                 }
1422                 /* Reset the flag */
1423                 for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1424                         rrt->rrt_rflags &= ~RRTF_CHANGED;
1425         }
1426 }
1427
1428 /*
1429  * Send all routes request packet to the specified interface.
1430  */
1431 void
1432 sendrequest(ifcp)
1433         struct ifc *ifcp;
1434 {
1435         struct netinfo6 *np;
1436         int error;
1437
1438         if (ifcp->ifc_flags & IFF_LOOPBACK)
1439                 return;
1440         ripbuf->rip6_cmd = RIP6_REQUEST;
1441         np = ripbuf->rip6_nets;
1442         memset(np, 0, sizeof(struct netinfo6));
1443         np->rip6_metric = HOPCNT_INFINITY6;
1444         tracet(1, "Send rtdump Request to %s (%s)\n",
1445                 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1446         error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
1447         if (error == EAFNOSUPPORT) {
1448                 /* Protocol not supported */
1449                 tracet(1, "Could not send rtdump Request to %s (%s): "
1450                         "set IFF_UP to 0\n",
1451                         ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1452                 ifcp->ifc_flags &= ~IFF_UP;     /* As if down for AF_INET6 */
1453         }
1454         ripbuf->rip6_cmd = RIP6_RESPONSE;
1455 }
1456
1457 /*
1458  * Process a RIP6_REQUEST packet.
1459  */
1460 void
1461 riprequest(ifcp, np, nn, sin6)
1462         struct ifc *ifcp;
1463         struct netinfo6 *np;
1464         int nn;
1465         struct sockaddr_in6 *sin6;
1466 {
1467         int i;
1468         struct riprt *rrt;
1469
1470         if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) &&
1471               np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) {
1472                 /* Specific response, don't split-horizon */
1473                 trace(1, "\tRIP Request\n");
1474                 for (i = 0; i < nn; i++, np++) {
1475                         rrt = rtsearch(np, NULL);
1476                         if (rrt)
1477                                 np->rip6_metric = rrt->rrt_info.rip6_metric;
1478                         else
1479                                 np->rip6_metric = HOPCNT_INFINITY6;
1480                 }
1481                 (void)sendpacket(sin6, RIPSIZE(nn));
1482                 return;
1483         }
1484         /* Whole routing table dump */
1485         trace(1, "\tRIP Request -- whole routing table\n");
1486         ripsend(ifcp, sin6, RRTF_SENDANYWAY);
1487 }
1488
1489 /*
1490  * Get information of each interface.
1491  */
1492 void
1493 ifconfig()
1494 {
1495         struct ifaddrs *ifap, *ifa;
1496         struct ifc *ifcp;
1497         struct ipv6_mreq mreq;
1498         int s;
1499
1500         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
1501                 fatal("socket");
1502                 /*NOTREACHED*/
1503         }
1504
1505         if (getifaddrs(&ifap) != 0) {
1506                 fatal("getifaddrs");
1507                 /*NOTREACHED*/
1508         }
1509
1510         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1511                 if (ifa->ifa_addr->sa_family != AF_INET6)
1512                         continue;
1513                 ifcp = ifc_find(ifa->ifa_name);
1514                 /* we are interested in multicast-capable interfaces */
1515                 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
1516                         continue;
1517                 if (!ifcp) {
1518                         /* new interface */
1519                         if ((ifcp = MALLOC(struct ifc)) == NULL) {
1520                                 fatal("malloc: struct ifc");
1521                                 /*NOTREACHED*/
1522                         }
1523                         memset(ifcp, 0, sizeof(*ifcp));
1524                         ifcp->ifc_index = -1;
1525                         ifcp->ifc_next = ifc;
1526                         ifc = ifcp;
1527                         nifc++;
1528                         ifcp->ifc_name = allocopy(ifa->ifa_name);
1529                         ifcp->ifc_addr = 0;
1530                         ifcp->ifc_filter = 0;
1531                         ifcp->ifc_flags = ifa->ifa_flags;
1532                         trace(1, "newif %s <%s>\n", ifcp->ifc_name,
1533                                 ifflags(ifcp->ifc_flags));
1534                         if (!strcmp(ifcp->ifc_name, LOOPBACK_IF))
1535                                 loopifcp = ifcp;
1536                 } else {
1537                         /* update flag, this may be up again */
1538                         if (ifcp->ifc_flags != ifa->ifa_flags) {
1539                                 trace(1, "%s: <%s> -> ", ifcp->ifc_name,
1540                                         ifflags(ifcp->ifc_flags));
1541                                 trace(1, "<%s>\n", ifflags(ifa->ifa_flags));
1542                                 ifcp->ifc_cflags |= IFC_CHANGED;
1543                         }
1544                         ifcp->ifc_flags = ifa->ifa_flags;
1545                 }
1546                 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s);
1547                 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP
1548                  && 0 < ifcp->ifc_index && !ifcp->ifc_joined) {
1549                         mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr;
1550                         mreq.ipv6mr_interface = ifcp->ifc_index;
1551                         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1552                             &mreq, sizeof(mreq)) < 0) {
1553                                 fatal("IPV6_JOIN_GROUP");
1554                                 /*NOTREACHED*/
1555                         }
1556                         trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST);
1557                         ifcp->ifc_joined++;
1558                 }
1559         }
1560         close(s);
1561         freeifaddrs(ifap);
1562 }
1563
1564 void
1565 ifconfig1(name, sa, ifcp, s)
1566         const char *name;
1567         const struct sockaddr *sa;
1568         struct  ifc *ifcp;
1569         int     s;
1570 {
1571         struct  in6_ifreq ifr;
1572         const struct sockaddr_in6 *sin6;
1573         struct  ifac *ifa;
1574         int     plen;
1575         char    buf[BUFSIZ];
1576
1577         sin6 = (const struct sockaddr_in6 *)sa;
1578         if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) && !lflag)
1579                 return;
1580         ifr.ifr_addr = *sin6;
1581         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1582         if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) {
1583                 fatal("ioctl: SIOCGIFNETMASK_IN6");
1584                 /*NOTREACHED*/
1585         }
1586         plen = sin6mask2len(&ifr.ifr_addr);
1587         if ((ifa = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) {
1588                 /* same interface found */
1589                 /* need check if something changed */
1590                 /* XXX not yet implemented */
1591                 return;
1592         }
1593         /*
1594          * New address is found
1595          */
1596         if ((ifa = MALLOC(struct ifac)) == NULL) {
1597                 fatal("malloc: struct ifac");
1598                 /*NOTREACHED*/
1599         }
1600         memset(ifa, 0, sizeof(*ifa));
1601         ifa->ifa_conf = ifcp;
1602         ifa->ifa_next = ifcp->ifc_addr;
1603         ifcp->ifc_addr = ifa;
1604         ifa->ifa_addr = sin6->sin6_addr;
1605         ifa->ifa_plen = plen;
1606         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1607                 ifr.ifr_addr = *sin6;
1608                 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) {
1609                         fatal("ioctl: SIOCGIFDSTADDR_IN6");
1610                         /*NOTREACHED*/
1611                 }
1612                 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr;
1613                 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf));
1614                 trace(1, "found address %s/%d -- %s\n",
1615                         inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf);
1616         } else {
1617                 trace(1, "found address %s/%d\n",
1618                         inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen);
1619         }
1620         if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1621                 ifcp->ifc_mylladdr = ifa->ifa_addr;
1622                 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr);
1623                 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len);
1624                 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr,
1625                         ifcp->ifc_index);
1626                 setindex2ifc(ifcp->ifc_index, ifcp);
1627                 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index);
1628                 if (ifcp->ifc_mtu > RIP6_MAXMTU)
1629                         ifcp->ifc_mtu = RIP6_MAXMTU;
1630                 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) {
1631                         fatal("ioctl: SIOCGIFMETRIC");
1632                         /*NOTREACHED*/
1633                 }
1634                 ifcp->ifc_metric = ifr.ifr_metric;
1635                 trace(1, "\tindex: %d, mtu: %d, metric: %d\n",
1636                         ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric);
1637         } else
1638                 ifcp->ifc_cflags |= IFC_CHANGED;
1639 }
1640
1641 /*
1642  * Receive and process routing messages.
1643  * Update interface information as necesssary.
1644  */
1645 void
1646 rtrecv()
1647 {
1648         char buf[BUFSIZ];
1649         char *p, *q;
1650         struct rt_msghdr *rtm;
1651         struct ifa_msghdr *ifam;
1652         struct if_msghdr *ifm;
1653         int len;
1654         struct ifc *ifcp, *ic;
1655         int iface = 0, rtable = 0;
1656         struct sockaddr_in6 *rta[RTAX_MAX];
1657         struct sockaddr_in6 mask;
1658         int i, addrs;
1659         struct riprt *rrt;
1660
1661         if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
1662                 perror("read from rtsock");
1663                 exit(1);
1664         }
1665         if (len < sizeof(*rtm)) {
1666                 trace(1, "short read from rtsock: %d (should be > %lu)\n",
1667                         len, (u_long)sizeof(*rtm));
1668                 return;
1669         }
1670         if (dflag >= 2) {
1671                 fprintf(stderr, "rtmsg:\n");
1672                 for (i = 0; i < len; i++) {
1673                         fprintf(stderr, "%02x ", buf[i] & 0xff);
1674                         if (i % 16 == 15) fprintf(stderr, "\n");
1675                 }
1676                 fprintf(stderr, "\n");
1677         }
1678
1679         for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) {
1680                 /* safety against bogus message */
1681                 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) {
1682                         trace(1, "bogus rtmsg: length=%d\n",
1683                                 ((struct rt_msghdr *)p)->rtm_msglen);
1684                         break;
1685                 }
1686                 rtm = NULL;
1687                 ifam = NULL;
1688                 ifm = NULL;
1689                 switch (((struct rt_msghdr *)p)->rtm_type) {
1690                 case RTM_NEWADDR:
1691                 case RTM_DELADDR:
1692                         ifam = (struct ifa_msghdr *)p;
1693                         addrs = ifam->ifam_addrs;
1694                         q = (char *)(ifam + 1);
1695                         break;
1696                 case RTM_IFINFO:
1697                         ifm = (struct if_msghdr *)p;
1698                         addrs = ifm->ifm_addrs;
1699                         q = (char *)(ifm + 1);
1700                         break;
1701                 default:
1702                         rtm = (struct rt_msghdr *)p;
1703                         addrs = rtm->rtm_addrs;
1704                         q = (char *)(rtm + 1);
1705                         if (rtm->rtm_version != RTM_VERSION) {
1706                                 trace(1, "unexpected rtmsg version %d "
1707                                         "(should be %d)\n",
1708                                         rtm->rtm_version, RTM_VERSION);
1709                                 continue;
1710                         }
1711                         if (rtm->rtm_pid == pid) {
1712 #if 0
1713                                 trace(1, "rtmsg looped back to me, ignored\n");
1714 #endif
1715                                 continue;
1716                         }
1717                         break;
1718                 }
1719                 memset(&rta, 0, sizeof(rta));
1720                 for (i = 0; i < RTAX_MAX; i++) {
1721                         if (addrs & (1 << i)) {
1722                                 rta[i] = (struct sockaddr_in6 *)q;
1723                                 q += ROUNDUP(rta[i]->sin6_len);
1724                         }
1725                 }
1726
1727                 trace(1, "rtsock: %s (addrs=%x)\n",
1728                         rttypes((struct rt_msghdr *)p), addrs);
1729                 if (dflag >= 2) {
1730                         for (i = 0;
1731                              i < ((struct rt_msghdr *)p)->rtm_msglen;
1732                              i++) {
1733                                 fprintf(stderr, "%02x ", p[i] & 0xff);
1734                                 if (i % 16 == 15) fprintf(stderr, "\n");
1735                         }
1736                         fprintf(stderr, "\n");
1737                 }
1738
1739                 /*
1740                  * Easy ones first.
1741                  *
1742                  * We may be able to optimize by using ifm->ifm_index or
1743                  * ifam->ifam_index.  For simplicity we don't do that here.
1744                  */
1745                 switch (((struct rt_msghdr *)p)->rtm_type) {
1746                 case RTM_NEWADDR:
1747                 case RTM_IFINFO:
1748                         iface++;
1749                         continue;
1750                 case RTM_ADD:
1751                         rtable++;
1752                         continue;
1753                 case RTM_LOSING:
1754                 case RTM_MISS:
1755                 case RTM_RESOLVE:
1756                 case RTM_GET:
1757                 case RTM_LOCK:
1758                         /* nothing to be done here */
1759                         trace(1, "\tnothing to be done, ignored\n");
1760                         continue;
1761                 }
1762
1763 #if 0
1764                 if (rta[RTAX_DST] == NULL) {
1765                         trace(1, "\tno destination, ignored\n");
1766                         continue;
1767                 }
1768                 if (rta[RTAX_DST]->sin6_family != AF_INET6) {
1769                         trace(1, "\taf mismatch, ignored\n");
1770                         continue;
1771                 }
1772                 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) {
1773                         trace(1, "\tlinklocal destination, ignored\n");
1774                         continue;
1775                 }
1776                 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) {
1777                         trace(1, "\tloopback destination, ignored\n");
1778                         continue;               /* Loopback */
1779                 }
1780                 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) {
1781                         trace(1, "\tmulticast destination, ignored\n");
1782                         continue;
1783                 }
1784 #endif
1785
1786                 /* hard ones */
1787                 switch (((struct rt_msghdr *)p)->rtm_type) {
1788                 case RTM_NEWADDR:
1789                 case RTM_IFINFO:
1790                 case RTM_ADD:
1791                 case RTM_LOSING:
1792                 case RTM_MISS:
1793                 case RTM_RESOLVE:
1794                 case RTM_GET:
1795                 case RTM_LOCK:
1796                         /* should already be handled */
1797                         fatal("rtrecv: never reach here");
1798                         /*NOTREACHED*/
1799                 case RTM_DELETE:
1800                         if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) {
1801                                 trace(1, "\tsome of dst/gw/netamsk are "
1802                                     "unavailable, ignored\n");
1803                                 break;
1804                         }
1805                         if ((rtm->rtm_flags & RTF_HOST) != 0) {
1806                                 mask.sin6_len = sizeof(mask);
1807                                 memset(&mask.sin6_addr, 0xff,
1808                                     sizeof(mask.sin6_addr));
1809                                 rta[RTAX_NETMASK] = &mask;
1810                         } else if (!rta[RTAX_NETMASK]) {
1811                                 trace(1, "\tsome of dst/gw/netamsk are "
1812                                     "unavailable, ignored\n");
1813                                 break;
1814                         }
1815                         if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY],
1816                             rta[RTAX_NETMASK]) == 0) {
1817                                 rtable++;       /*just to be sure*/
1818                         }
1819                         break;
1820                 case RTM_CHANGE:
1821                 case RTM_REDIRECT:
1822                         trace(1, "\tnot supported yet, ignored\n");
1823                         break;
1824                 case RTM_DELADDR:
1825                         if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) {
1826                                 trace(1, "\tno netmask or ifa given, ignored\n");
1827                                 break;
1828                         }
1829                         if (ifam->ifam_index < nindex2ifc)
1830                                 ifcp = index2ifc[ifam->ifam_index];
1831                         else
1832                                 ifcp = NULL;
1833                         if (!ifcp) {
1834                                 trace(1, "\tinvalid ifam_index %d, ignored\n",
1835                                         ifam->ifam_index);
1836                                 break;
1837                         }
1838                         if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK]))
1839                                 iface++;
1840                         break;
1841                 case RTM_OLDADD:
1842                 case RTM_OLDDEL:
1843                         trace(1, "\tnot supported yet, ignored\n");
1844                         break;
1845                 }
1846
1847         }
1848
1849         if (iface) {
1850                 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n");
1851                 ifconfig();
1852                 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
1853                         if (ifcp->ifc_cflags & IFC_CHANGED) {
1854                                 if (ifrt(ifcp, 1)) {
1855                                         for (ic = ifc; ic; ic = ic->ifc_next) {
1856                                                 if (ifcp->ifc_index == ic->ifc_index)
1857                                                         continue;
1858                                                 if (ic->ifc_flags & IFF_UP)
1859                                                         ripsend(ic, &ic->ifc_ripsin,
1860                                                         RRTF_CHANGED);
1861                                         }
1862                                         /* Reset the flag */
1863                                         for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1864                                                 rrt->rrt_rflags &= ~RRTF_CHANGED;
1865                                 }
1866                                 ifcp->ifc_cflags &= ~IFC_CHANGED;
1867                         }
1868         }
1869         if (rtable) {
1870                 trace(1, "rtsock: read routing table again\n");
1871                 krtread(1);
1872         }
1873 }
1874
1875 /*
1876  * remove specified route from the internal routing table.
1877  */
1878 int
1879 rt_del(sdst, sgw, smask)
1880         const struct sockaddr_in6 *sdst;
1881         const struct sockaddr_in6 *sgw;
1882         const struct sockaddr_in6 *smask;
1883 {
1884         const struct in6_addr *dst = NULL;
1885         const struct in6_addr *gw = NULL;
1886         int prefix;
1887         struct netinfo6 ni6;
1888         struct riprt *rrt = NULL;
1889         time_t t_lifetime;
1890
1891         if (sdst->sin6_family != AF_INET6) {
1892                 trace(1, "\tother AF, ignored\n");
1893                 return -1;
1894         }
1895         if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr)
1896          || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback)
1897          || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) {
1898                 trace(1, "\taddress %s not interesting, ignored\n",
1899                         inet6_n2p(&sdst->sin6_addr));
1900                 return -1;
1901         }
1902         dst = &sdst->sin6_addr;
1903         if (sgw->sin6_family == AF_INET6) {
1904                 /* easy case */
1905                 gw = &sgw->sin6_addr;
1906                 prefix = sin6mask2len(smask);
1907         } else if (sgw->sin6_family == AF_LINK) {
1908                 /*
1909                  * Interface route... a hard case.  We need to get the prefix
1910                  * length from the kernel, but we now are parsing rtmsg.
1911                  * We'll purge matching routes from my list, then get the
1912                  * fresh list.
1913                  */
1914                 struct riprt *longest;
1915                 trace(1, "\t%s is an interface route, guessing prefixlen\n",
1916                         inet6_n2p(dst));
1917                 longest = NULL;
1918                 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
1919                         if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
1920                                         &sdst->sin6_addr)
1921                          && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
1922                                 if (!longest
1923                                  || longest->rrt_info.rip6_plen <
1924                                                  rrt->rrt_info.rip6_plen) {
1925                                         longest = rrt;
1926                                 }
1927                         }
1928                 }
1929                 rrt = longest;
1930                 if (!rrt) {
1931                         trace(1, "\tno matching interface route found\n");
1932                         return -1;
1933                 }
1934                 gw = &in6addr_loopback;
1935                 prefix = rrt->rrt_info.rip6_plen;
1936         } else {
1937                 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family);
1938                 return -1;
1939         }
1940
1941         trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix);
1942         trace(1, "gw %s\n", inet6_n2p(gw));
1943         t_lifetime = time(NULL) - RIP_LIFETIME;
1944         /* age route for interface address */
1945         memset(&ni6, 0, sizeof(ni6));
1946         ni6.rip6_dest = *dst;
1947         ni6.rip6_plen = prefix;
1948         applyplen(&ni6.rip6_dest, ni6.rip6_plen);       /*to be sure*/
1949         trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest),
1950                 ni6.rip6_plen);
1951         if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) {
1952                 trace(1, "\tno route found\n");
1953                 return -1;
1954         }
1955 #if 0
1956         if ((rrt->rrt_flags & RTF_STATIC) == 0) {
1957                 trace(1, "\tyou can delete static routes only\n");
1958         } else
1959 #endif
1960         if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) {
1961                 trace(1, "\tgw mismatch: %s <-> ",
1962                         inet6_n2p(&rrt->rrt_gw));
1963                 trace(1, "%s\n", inet6_n2p(gw));
1964         } else {
1965                 trace(1, "\troute found, age it\n");
1966                 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1967                         rrt->rrt_t = t_lifetime;
1968                         rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1969                 }
1970         }
1971         return 0;
1972 }
1973
1974 /*
1975  * remove specified address from internal interface/routing table.
1976  */
1977 int
1978 rt_deladdr(ifcp, sifa, smask)
1979         struct ifc *ifcp;
1980         const struct sockaddr_in6 *sifa;
1981         const struct sockaddr_in6 *smask;
1982 {
1983         const struct in6_addr *addr = NULL;
1984         int prefix;
1985         struct ifac *ifa = NULL;
1986         struct netinfo6 ni6;
1987         struct riprt *rrt = NULL;
1988         time_t t_lifetime;
1989         int updated = 0;
1990
1991         if (sifa->sin6_family != AF_INET6) {
1992                 trace(1, "\tother AF, ignored\n");
1993                 return -1;
1994         }
1995         addr = &sifa->sin6_addr;
1996         prefix = sin6mask2len(smask);
1997
1998         trace(1, "\tdeleting %s/%d from %s\n",
1999                 inet6_n2p(addr), prefix, ifcp->ifc_name);
2000         ifa = ifa_match(ifcp, addr, prefix);
2001         if (!ifa) {
2002                 trace(1, "\tno matching ifa found for %s/%d on %s\n",
2003                         inet6_n2p(addr), prefix, ifcp->ifc_name);
2004                 return -1;
2005         }
2006         if (ifa->ifa_conf != ifcp) {
2007                 trace(1, "\taddress table corrupt: back pointer does not match "
2008                         "(%s != %s)\n",
2009                         ifcp->ifc_name, ifa->ifa_conf->ifc_name);
2010                 return -1;
2011         }
2012         /* remove ifa from interface */
2013         if (ifcp->ifc_addr == ifa)
2014                 ifcp->ifc_addr = ifa->ifa_next;
2015         else {
2016                 struct ifac *p;
2017                 for (p = ifcp->ifc_addr; p; p = p->ifa_next) {
2018                         if (p->ifa_next == ifa) {
2019                                 p->ifa_next = ifa->ifa_next;
2020                                 break;
2021                         }
2022                 }
2023         }
2024         ifa->ifa_next = NULL;
2025         ifa->ifa_conf = NULL;
2026         t_lifetime = time(NULL) - RIP_LIFETIME;
2027         /* age route for interface address */
2028         memset(&ni6, 0, sizeof(ni6));
2029         ni6.rip6_dest = ifa->ifa_addr;
2030         ni6.rip6_plen = ifa->ifa_plen;
2031         applyplen(&ni6.rip6_dest, ni6.rip6_plen);
2032         trace(1, "\tfind interface route %s/%d on %d\n",
2033                 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index);
2034         if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
2035                 struct in6_addr none;
2036                 memset(&none, 0, sizeof(none));
2037                 if (rrt->rrt_index == ifcp->ifc_index &&
2038                     (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) ||
2039                      IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) {
2040                         trace(1, "\troute found, age it\n");
2041                         if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
2042                                 rrt->rrt_t = t_lifetime;
2043                                 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
2044                         }
2045                         updated++;
2046                 } else {
2047                         trace(1, "\tnon-interface route found: %s/%d on %d\n",
2048                                 inet6_n2p(&rrt->rrt_info.rip6_dest),
2049                                 rrt->rrt_info.rip6_plen,
2050                                 rrt->rrt_index);
2051                 }
2052         } else
2053                 trace(1, "\tno interface route found\n");
2054         /* age route for p2p destination */
2055         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
2056                 memset(&ni6, 0, sizeof(ni6));
2057                 ni6.rip6_dest = ifa->ifa_raddr;
2058                 ni6.rip6_plen = 128;
2059                 applyplen(&ni6.rip6_dest, ni6.rip6_plen);       /*to be sure*/
2060                 trace(1, "\tfind p2p route %s/%d on %d\n",
2061                         inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen,
2062                         ifcp->ifc_index);
2063                 if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
2064                         if (rrt->rrt_index == ifcp->ifc_index &&
2065                             IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) {
2066                                 trace(1, "\troute found, age it\n");
2067                                 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
2068                                         rrt->rrt_t = t_lifetime;
2069                                         rrt->rrt_info.rip6_metric =
2070                                             HOPCNT_INFINITY6;
2071                                         updated++;
2072                                 }
2073                         } else {
2074                                 trace(1, "\tnon-p2p route found: %s/%d on %d\n",
2075                                         inet6_n2p(&rrt->rrt_info.rip6_dest),
2076                                         rrt->rrt_info.rip6_plen,
2077                                         rrt->rrt_index);
2078                         }
2079                 } else
2080                         trace(1, "\tno p2p route found\n");
2081         }
2082         return updated ? 0 : -1;
2083 }
2084
2085 /*
2086  * Get each interface address and put those interface routes to the route
2087  * list.
2088  */
2089 int
2090 ifrt(ifcp, again)
2091         struct ifc *ifcp;
2092         int again;
2093 {
2094         struct ifac *ifa;
2095         struct riprt *rrt = NULL, *search_rrt, *prev_rrt, *loop_rrt;
2096         struct netinfo6 *np;
2097         time_t t_lifetime;
2098         int need_trigger = 0;
2099
2100 #if 0
2101         if (ifcp->ifc_flags & IFF_LOOPBACK)
2102                 return 0;                       /* ignore loopback */
2103 #endif
2104
2105         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
2106                 ifrt_p2p(ifcp, again);
2107                 return 0;
2108         }
2109
2110         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2111                 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
2112 #if 0
2113                         trace(1, "route: %s on %s: "
2114                             "skip linklocal interface address\n",
2115                             inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name);
2116 #endif
2117                         continue;
2118                 }
2119                 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) {
2120 #if 0
2121                         trace(1, "route: %s: skip unspec interface address\n",
2122                             ifcp->ifc_name);
2123 #endif
2124                         continue;
2125                 }
2126                 if (IN6_IS_ADDR_LOOPBACK(&ifa->ifa_addr)) {
2127 #if 0
2128                         trace(1, "route: %s: skip loopback address\n",
2129                             ifcp->ifc_name);
2130 #endif
2131                         continue;
2132                 }
2133                 if (ifcp->ifc_flags & IFF_UP) {
2134                         if ((rrt = MALLOC(struct riprt)) == NULL)
2135                                 fatal("malloc: struct riprt");
2136                         memset(rrt, 0, sizeof(*rrt));
2137                         rrt->rrt_same = NULL;
2138                         rrt->rrt_index = ifcp->ifc_index;
2139                         rrt->rrt_t = 0; /* don't age */
2140                         rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2141                         rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2142                         rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
2143                         rrt->rrt_info.rip6_plen = ifa->ifa_plen;
2144                         if (ifa->ifa_plen == 128)
2145                                 rrt->rrt_flags = RTF_HOST;
2146                         else
2147                                 rrt->rrt_flags = RTF_CLONING;
2148                         rrt->rrt_rflags |= RRTF_CHANGED;
2149                         applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen);
2150                         memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2151                         rrt->rrt_gw = ifa->ifa_addr;
2152                         np = &rrt->rrt_info;
2153                         search_rrt = rtsearch(np, &prev_rrt);
2154                         if (search_rrt != NULL) {
2155                                 if (search_rrt->rrt_info.rip6_metric <=
2156                                     rrt->rrt_info.rip6_metric) {
2157                                         /* Already have better route */
2158                                         if (!again) {
2159                                                 trace(1, "route: %s/%d: "
2160                                                     "already registered (%s)\n",
2161                                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2162                                                     ifcp->ifc_name);
2163                                         }
2164                                         goto next;
2165                                 }
2166
2167                                 if (prev_rrt)
2168                                         prev_rrt->rrt_next = rrt->rrt_next;
2169                                 else
2170                                         riprt = rrt->rrt_next;
2171                                 delroute(&rrt->rrt_info, &rrt->rrt_gw);
2172                         }
2173                         /* Attach the route to the list */
2174                         trace(1, "route: %s/%d: register route (%s)\n",
2175                             inet6_n2p(&np->rip6_dest), np->rip6_plen,
2176                             ifcp->ifc_name);
2177                         rrt->rrt_next = riprt;
2178                         riprt = rrt;
2179                         addroute(rrt, &rrt->rrt_gw, ifcp);
2180                         rrt = NULL;
2181                         sendrequest(ifcp);
2182                         ripsend(ifcp, &ifcp->ifc_ripsin, 0);
2183                         need_trigger = 1;
2184                 } else {
2185                         for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) {
2186                                 if (loop_rrt->rrt_index == ifcp->ifc_index) {
2187                                         t_lifetime = time(NULL) - RIP_LIFETIME;
2188                                         if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) {
2189                                                 loop_rrt->rrt_t = t_lifetime;
2190                                                 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
2191                                                 loop_rrt->rrt_rflags |= RRTF_CHANGED;
2192                                                 need_trigger = 1;
2193                                         }
2194                                 }
2195                         }
2196                 }
2197         next:
2198                 if (rrt)
2199                         free(rrt);
2200         }
2201         return need_trigger;
2202 }
2203
2204 /*
2205  * there are couple of p2p interface routing models.  "behavior" lets
2206  * you pick one.  it looks that gated behavior fits best with BSDs,
2207  * since BSD kernels do not look at prefix length on p2p interfaces.
2208  */
2209 void
2210 ifrt_p2p(ifcp, again)
2211         struct ifc *ifcp;
2212         int again;
2213 {
2214         struct ifac *ifa;
2215         struct riprt *rrt, *orrt, *prevrrt;
2216         struct netinfo6 *np;
2217         struct in6_addr addr, dest;
2218         int advert, ignore, i;
2219 #define P2PADVERT_NETWORK       1
2220 #define P2PADVERT_ADDR          2
2221 #define P2PADVERT_DEST          4
2222 #define P2PADVERT_MAX           4
2223         const enum { CISCO, GATED, ROUTE6D } behavior = GATED;
2224         const char *category = "";
2225         const char *noadv;
2226
2227         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2228                 addr = ifa->ifa_addr;
2229                 dest = ifa->ifa_raddr;
2230                 applyplen(&addr, ifa->ifa_plen);
2231                 applyplen(&dest, ifa->ifa_plen);
2232                 advert = ignore = 0;
2233                 switch (behavior) {
2234                 case CISCO:
2235                         /*
2236                          * honor addr/plen, just like normal shared medium
2237                          * interface.  this may cause trouble if you reuse
2238                          * addr/plen on other interfaces.
2239                          *
2240                          * advertise addr/plen.
2241                          */
2242                         advert |= P2PADVERT_NETWORK;
2243                         break;
2244                 case GATED:
2245                         /*
2246                          * prefixlen on p2p interface is meaningless.
2247                          * advertise addr/128 and dest/128.
2248                          *
2249                          * do not install network route to route6d routing
2250                          * table (if we do, it would prevent route installation
2251                          * for other p2p interface that shares addr/plen).
2252                          *
2253                          * XXX what should we do if dest is ::?  it will not
2254                          * get announced anyways (see following filter),
2255                          * but we need to think.
2256                          */
2257                         advert |= P2PADVERT_ADDR;
2258                         advert |= P2PADVERT_DEST;
2259                         ignore |= P2PADVERT_NETWORK;
2260                         break;
2261                 case ROUTE6D:
2262                         /*
2263                          * just for testing.  actually the code is redundant
2264                          * given the current p2p interface address assignment
2265                          * rule for kame kernel.
2266                          *
2267                          * intent:
2268                          *      A/n -> announce A/n
2269                          *      A B/n, A and B share prefix -> A/n (= B/n)
2270                          *      A B/n, do not share prefix -> A/128 and B/128
2271                          * actually, A/64 and A B/128 are the only cases
2272                          * permitted by the kernel:
2273                          *      A/64 -> A/64
2274                          *      A B/128 -> A/128 and B/128
2275                          */
2276                         if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) {
2277                                 if (IN6_ARE_ADDR_EQUAL(&addr, &dest))
2278                                         advert |= P2PADVERT_NETWORK;
2279                                 else {
2280                                         advert |= P2PADVERT_ADDR;
2281                                         advert |= P2PADVERT_DEST;
2282                                         ignore |= P2PADVERT_NETWORK;
2283                                 }
2284                         } else
2285                                 advert |= P2PADVERT_NETWORK;
2286                         break;
2287                 }
2288
2289                 for (i = 1; i <= P2PADVERT_MAX; i *= 2) {
2290                         if ((ignore & i) != 0)
2291                                 continue;
2292                         if ((rrt = MALLOC(struct riprt)) == NULL) {
2293                                 fatal("malloc: struct riprt");
2294                                 /*NOTREACHED*/
2295                         }
2296                         memset(rrt, 0, sizeof(*rrt));
2297                         rrt->rrt_same = NULL;
2298                         rrt->rrt_index = ifcp->ifc_index;
2299                         rrt->rrt_t = 0; /* don't age */
2300                         switch (i) {
2301                         case P2PADVERT_NETWORK:
2302                                 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2303                                 rrt->rrt_info.rip6_plen = ifa->ifa_plen;
2304                                 applyplen(&rrt->rrt_info.rip6_dest,
2305                                     ifa->ifa_plen);
2306                                 category = "network";
2307                                 break;
2308                         case P2PADVERT_ADDR:
2309                                 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2310                                 rrt->rrt_info.rip6_plen = 128;
2311                                 rrt->rrt_gw = in6addr_loopback;
2312                                 category = "addr";
2313                                 break;
2314                         case P2PADVERT_DEST:
2315                                 rrt->rrt_info.rip6_dest = ifa->ifa_raddr;
2316                                 rrt->rrt_info.rip6_plen = 128;
2317                                 rrt->rrt_gw = ifa->ifa_addr;
2318                                 category = "dest";
2319                                 break;
2320                         }
2321                         if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) ||
2322                             IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) {
2323 #if 0
2324                                 trace(1, "route: %s: skip unspec/linklocal "
2325                                     "(%s on %s)\n", category, ifcp->ifc_name);
2326 #endif
2327                                 free(rrt);
2328                                 continue;
2329                         }
2330                         if ((advert & i) == 0) {
2331                                 rrt->rrt_rflags |= RRTF_NOADVERTISE;
2332                                 noadv = ", NO-ADV";
2333                         } else
2334                                 noadv = "";
2335                         rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2336                         rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
2337                         np = &rrt->rrt_info;
2338                         orrt = rtsearch(np, &prevrrt);
2339                         if (!orrt) {
2340                                 /* Attach the route to the list */
2341                                 trace(1, "route: %s/%d: register route "
2342                                     "(%s on %s%s)\n",
2343                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2344                                     category, ifcp->ifc_name, noadv);
2345                                 rrt->rrt_next = riprt;
2346                                 riprt = rrt;
2347                         } else if (rrt->rrt_index != orrt->rrt_index ||
2348                             rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) {
2349                                 /* swap route */
2350                                 rrt->rrt_next = orrt->rrt_next;
2351                                 if (prevrrt)
2352                                         prevrrt->rrt_next = rrt;
2353                                 else
2354                                         riprt = rrt;
2355                                 free(orrt);
2356
2357                                 trace(1, "route: %s/%d: update (%s on %s%s)\n",
2358                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2359                                     category, ifcp->ifc_name, noadv);
2360                         } else {
2361                                 /* Already found */
2362                                 if (!again) {
2363                                         trace(1, "route: %s/%d: "
2364                                             "already registered (%s on %s%s)\n",
2365                                             inet6_n2p(&np->rip6_dest),
2366                                             np->rip6_plen, category,
2367                                             ifcp->ifc_name, noadv);
2368                                 }
2369                                 free(rrt);
2370                         }
2371                 }
2372         }
2373 #undef P2PADVERT_NETWORK
2374 #undef P2PADVERT_ADDR
2375 #undef P2PADVERT_DEST
2376 #undef P2PADVERT_MAX
2377 }
2378
2379 int
2380 getifmtu(ifindex)
2381         int     ifindex;
2382 {
2383         int     mib[6];
2384         char    *buf;
2385         size_t  msize;
2386         struct  if_msghdr *ifm;
2387         int     mtu;
2388
2389         mib[0] = CTL_NET;
2390         mib[1] = PF_ROUTE;
2391         mib[2] = 0;
2392         mib[3] = AF_INET6;
2393         mib[4] = NET_RT_IFLIST;
2394         mib[5] = ifindex;
2395         if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2396                 fatal("sysctl estimate NET_RT_IFLIST");
2397                 /*NOTREACHED*/
2398         }
2399         if ((buf = malloc(msize)) == NULL) {
2400                 fatal("malloc");
2401                 /*NOTREACHED*/
2402         }
2403         if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2404                 fatal("sysctl NET_RT_IFLIST");
2405                 /*NOTREACHED*/
2406         }
2407         ifm = (struct if_msghdr *)buf;
2408         mtu = ifm->ifm_data.ifi_mtu;
2409         if (ifindex != ifm->ifm_index) {
2410                 fatal("ifindex does not match with ifm_index");
2411                 /*NOTREACHED*/
2412         }
2413         free(buf);
2414         return mtu;
2415 }
2416
2417 const char *
2418 rttypes(rtm)
2419         struct rt_msghdr *rtm;
2420 {
2421 #define RTTYPE(s, f) \
2422 do { \
2423         if (rtm->rtm_type == (f)) \
2424                 return (s); \
2425 } while (0)
2426         RTTYPE("ADD", RTM_ADD);
2427         RTTYPE("DELETE", RTM_DELETE);
2428         RTTYPE("CHANGE", RTM_CHANGE);
2429         RTTYPE("GET", RTM_GET);
2430         RTTYPE("LOSING", RTM_LOSING);
2431         RTTYPE("REDIRECT", RTM_REDIRECT);
2432         RTTYPE("MISS", RTM_MISS);
2433         RTTYPE("LOCK", RTM_LOCK);
2434         RTTYPE("OLDADD", RTM_OLDADD);
2435         RTTYPE("OLDDEL", RTM_OLDDEL);
2436         RTTYPE("RESOLVE", RTM_RESOLVE);
2437         RTTYPE("NEWADDR", RTM_NEWADDR);
2438         RTTYPE("DELADDR", RTM_DELADDR);
2439         RTTYPE("IFINFO", RTM_IFINFO);
2440 #ifdef RTM_OLDADD
2441         RTTYPE("OLDADD", RTM_OLDADD);
2442 #endif
2443 #ifdef RTM_OLDDEL
2444         RTTYPE("OLDDEL", RTM_OLDDEL);
2445 #endif
2446 #ifdef RTM_OIFINFO
2447         RTTYPE("OIFINFO", RTM_OIFINFO);
2448 #endif
2449 #ifdef RTM_IFANNOUNCE
2450         RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE);
2451 #endif
2452 #ifdef RTM_NEWMADDR
2453         RTTYPE("NEWMADDR", RTM_NEWMADDR);
2454 #endif
2455 #ifdef RTM_DELMADDR
2456         RTTYPE("DELMADDR", RTM_DELMADDR);
2457 #endif
2458 #undef RTTYPE
2459         return NULL;
2460 }
2461
2462 const char *
2463 rtflags(rtm)
2464         struct rt_msghdr *rtm;
2465 {
2466         static char buf[BUFSIZ];
2467
2468         /*
2469          * letter conflict should be okay.  painful when *BSD diverges...
2470          */
2471         strlcpy(buf, "", sizeof(buf));
2472 #define RTFLAG(s, f) \
2473 do { \
2474         if (rtm->rtm_flags & (f)) \
2475                 strlcat(buf, (s), sizeof(buf)); \
2476 } while (0)
2477         RTFLAG("U", RTF_UP);
2478         RTFLAG("G", RTF_GATEWAY);
2479         RTFLAG("H", RTF_HOST);
2480         RTFLAG("R", RTF_REJECT);
2481         RTFLAG("D", RTF_DYNAMIC);
2482         RTFLAG("M", RTF_MODIFIED);
2483         RTFLAG("d", RTF_DONE);
2484 #ifdef  RTF_MASK
2485         RTFLAG("m", RTF_MASK);
2486 #endif
2487         RTFLAG("C", RTF_CLONING);
2488 #ifdef RTF_CLONED
2489         RTFLAG("c", RTF_CLONED);
2490 #endif
2491 #ifdef RTF_PRCLONING
2492         RTFLAG("c", RTF_PRCLONING);
2493 #endif
2494 #ifdef RTF_WASCLONED
2495         RTFLAG("W", RTF_WASCLONED);
2496 #endif
2497         RTFLAG("X", RTF_XRESOLVE);
2498         RTFLAG("L", RTF_LLINFO);
2499         RTFLAG("S", RTF_STATIC);
2500         RTFLAG("B", RTF_BLACKHOLE);
2501 #ifdef RTF_PROTO3
2502         RTFLAG("3", RTF_PROTO3);
2503 #endif
2504         RTFLAG("2", RTF_PROTO2);
2505         RTFLAG("1", RTF_PROTO1);
2506 #ifdef RTF_BROADCAST
2507         RTFLAG("b", RTF_BROADCAST);
2508 #endif
2509 #ifdef RTF_DEFAULT
2510         RTFLAG("d", RTF_DEFAULT);
2511 #endif
2512 #ifdef RTF_ISAROUTER
2513         RTFLAG("r", RTF_ISAROUTER);
2514 #endif
2515 #ifdef RTF_TUNNEL
2516         RTFLAG("T", RTF_TUNNEL);
2517 #endif
2518 #ifdef RTF_AUTH
2519         RTFLAG("A", RTF_AUTH);
2520 #endif
2521 #ifdef RTF_CRYPT
2522         RTFLAG("E", RTF_CRYPT);
2523 #endif
2524 #undef RTFLAG
2525         return buf;
2526 }
2527
2528 const char *
2529 ifflags(flags)
2530         int flags;
2531 {
2532         static char buf[BUFSIZ];
2533
2534         strlcpy(buf, "", sizeof(buf));
2535 #define IFFLAG(s, f) \
2536 do { \
2537         if (flags & (f)) { \
2538                 if (buf[0]) \
2539                         strlcat(buf, ",", sizeof(buf)); \
2540                 strlcat(buf, (s), sizeof(buf)); \
2541         } \
2542 } while (0)
2543         IFFLAG("UP", IFF_UP);
2544         IFFLAG("BROADCAST", IFF_BROADCAST);
2545         IFFLAG("DEBUG", IFF_DEBUG);
2546         IFFLAG("LOOPBACK", IFF_LOOPBACK);
2547         IFFLAG("POINTOPOINT", IFF_POINTOPOINT);
2548 #ifdef IFF_NOTRAILERS
2549         IFFLAG("NOTRAILERS", IFF_NOTRAILERS);
2550 #endif
2551 #ifdef IFF_SMART
2552         IFFLAG("SMART", IFF_SMART);
2553 #endif
2554         IFFLAG("RUNNING", IFF_RUNNING);
2555         IFFLAG("NOARP", IFF_NOARP);
2556         IFFLAG("PROMISC", IFF_PROMISC);
2557         IFFLAG("ALLMULTI", IFF_ALLMULTI);
2558         IFFLAG("OACTIVE", IFF_OACTIVE);
2559         IFFLAG("SIMPLEX", IFF_SIMPLEX);
2560         IFFLAG("LINK0", IFF_LINK0);
2561         IFFLAG("LINK1", IFF_LINK1);
2562         IFFLAG("LINK2", IFF_LINK2);
2563         IFFLAG("MULTICAST", IFF_MULTICAST);
2564 #undef IFFLAG
2565         return buf;
2566 }
2567
2568 void
2569 krtread(again)
2570         int again;
2571 {
2572         int mib[6];
2573         size_t msize;
2574         char *buf, *p, *lim;
2575         struct rt_msghdr *rtm;
2576         int retry;
2577         const char *errmsg;
2578
2579         retry = 0;
2580         buf = NULL;
2581         mib[0] = CTL_NET;
2582         mib[1] = PF_ROUTE;
2583         mib[2] = 0;
2584         mib[3] = AF_INET6;      /* Address family */
2585         mib[4] = NET_RT_DUMP;   /* Dump the kernel routing table */
2586         mib[5] = 0;             /* No flags */
2587         do {
2588                 retry++;
2589                 errmsg = NULL;
2590                 if (buf)
2591                         free(buf);
2592                 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2593                         errmsg = "sysctl estimate";
2594                         continue;
2595                 }
2596                 if ((buf = malloc(msize)) == NULL) {
2597                         errmsg = "malloc";
2598                         continue;
2599                 }
2600                 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2601                         errmsg = "sysctl NET_RT_DUMP";
2602                         continue;
2603                 }
2604         } while (retry < 5 && errmsg != NULL);
2605         if (errmsg) {
2606                 fatal("%s (with %d retries, msize=%lu)", errmsg, retry,
2607                     (u_long)msize);
2608                 /*NOTREACHED*/
2609         } else if (1 < retry)
2610                 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry);
2611
2612         lim = buf + msize;
2613         for (p = buf; p < lim; p += rtm->rtm_msglen) {
2614                 rtm = (struct rt_msghdr *)p;
2615                 rt_entry(rtm, again);
2616         }
2617         free(buf);
2618 }
2619
2620 void
2621 rt_entry(rtm, again)
2622         struct rt_msghdr *rtm;
2623         int again;
2624 {
2625         struct  sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask;
2626         struct  sockaddr_in6 *sin6_genmask, *sin6_ifp;
2627         char    *rtmp, *ifname = NULL;
2628         struct  riprt *rrt, *orrt;
2629         struct  netinfo6 *np;
2630         int     s;
2631
2632         sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0;
2633         if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags &
2634                 (RTF_CLONING|RTF_XRESOLVE|RTF_LLINFO|RTF_BLACKHOLE)) {
2635                 return;         /* not interested in the link route */
2636         }
2637         /* do not look at cloned routes */
2638 #ifdef RTF_WASCLONED
2639         if (rtm->rtm_flags & RTF_WASCLONED)
2640                 return;
2641 #endif
2642 #ifdef RTF_CLONED
2643         if (rtm->rtm_flags & RTF_CLONED)
2644                 return;
2645 #endif
2646         /*
2647          * do not look at dynamic routes.
2648          * netbsd/openbsd cloned routes have UGHD.
2649          */
2650         if (rtm->rtm_flags & RTF_DYNAMIC)
2651                 return;
2652         rtmp = (char *)(rtm + 1);
2653         /* Destination */
2654         if ((rtm->rtm_addrs & RTA_DST) == 0)
2655                 return;         /* ignore routes without destination address */
2656         sin6_dst = (struct sockaddr_in6 *)rtmp;
2657         rtmp += ROUNDUP(sin6_dst->sin6_len);
2658         if (rtm->rtm_addrs & RTA_GATEWAY) {
2659                 sin6_gw = (struct sockaddr_in6 *)rtmp;
2660                 rtmp += ROUNDUP(sin6_gw->sin6_len);
2661         }
2662         if (rtm->rtm_addrs & RTA_NETMASK) {
2663                 sin6_mask = (struct sockaddr_in6 *)rtmp;
2664                 rtmp += ROUNDUP(sin6_mask->sin6_len);
2665         }
2666         if (rtm->rtm_addrs & RTA_GENMASK) {
2667                 sin6_genmask = (struct sockaddr_in6 *)rtmp;
2668                 rtmp += ROUNDUP(sin6_genmask->sin6_len);
2669         }
2670         if (rtm->rtm_addrs & RTA_IFP) {
2671                 sin6_ifp = (struct sockaddr_in6 *)rtmp;
2672                 rtmp += ROUNDUP(sin6_ifp->sin6_len);
2673         }
2674
2675         /* Destination */
2676         if (sin6_dst->sin6_family != AF_INET6)
2677                 return;
2678         if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr))
2679                 return;         /* Link-local */
2680         if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback))
2681                 return;         /* Loopback */
2682         if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr))
2683                 return;
2684
2685         if ((rrt = MALLOC(struct riprt)) == NULL) {
2686                 fatal("malloc: struct riprt");
2687                 /*NOTREACHED*/
2688         }
2689         memset(rrt, 0, sizeof(*rrt));
2690         np = &rrt->rrt_info;
2691         rrt->rrt_same = NULL;
2692         rrt->rrt_t = time(NULL);
2693         if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC))
2694                 rrt->rrt_t = 0; /* Don't age static routes */
2695         if ((rtm->rtm_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST)
2696                 rrt->rrt_t = 0; /* Don't age non-gateway host routes */
2697         np->rip6_tag = 0;
2698         np->rip6_metric = rtm->rtm_rmx.rmx_hopcount;
2699         if (np->rip6_metric < 1)
2700                 np->rip6_metric = 1;
2701         rrt->rrt_flags = rtm->rtm_flags;
2702         np->rip6_dest = sin6_dst->sin6_addr;
2703
2704         /* Mask or plen */
2705         if (rtm->rtm_flags & RTF_HOST)
2706                 np->rip6_plen = 128;    /* Host route */
2707         else if (sin6_mask)
2708                 np->rip6_plen = sin6mask2len(sin6_mask);
2709         else
2710                 np->rip6_plen = 0;
2711
2712         orrt = rtsearch(np, NULL);
2713         if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) {
2714                 /* Already found */
2715                 if (!again) {
2716                         trace(1, "route: %s/%d flags %s: already registered\n",
2717                                 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2718                                 rtflags(rtm));
2719                 }
2720                 free(rrt);
2721                 return;
2722         }
2723         /* Gateway */
2724         if (!sin6_gw)
2725                 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2726         else {
2727                 if (sin6_gw->sin6_family == AF_INET6)
2728                         rrt->rrt_gw = sin6_gw->sin6_addr;
2729                 else if (sin6_gw->sin6_family == AF_LINK) {
2730                         /* XXX in case ppp link? */
2731                         rrt->rrt_gw = in6addr_loopback;
2732                 } else
2733                         memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2734         }
2735         trace(1, "route: %s/%d flags %s",
2736                 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm));
2737         trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw));
2738
2739         /* Interface */
2740         s = rtm->rtm_index;
2741         if (s < nindex2ifc && index2ifc[s])
2742                 ifname = index2ifc[s]->ifc_name;
2743         else {
2744                 trace(1, " not configured\n");
2745                 free(rrt);
2746                 return;
2747         }
2748         trace(1, " if %s sock %d", ifname, s);
2749         rrt->rrt_index = s;
2750
2751         trace(1, "\n");
2752
2753         /* Check gateway */
2754         if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) &&
2755             !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw) &&
2756             (rrt->rrt_flags & RTF_LOCAL) == 0) {
2757                 trace(0, "***** Gateway %s is not a link-local address.\n",
2758                         inet6_n2p(&rrt->rrt_gw));
2759                 trace(0, "*****     dest(%s) if(%s) -- Not optimized.\n",
2760                         inet6_n2p(&rrt->rrt_info.rip6_dest), ifname);
2761                 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR;
2762         }
2763
2764         /* Put it to the route list */
2765         if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) {
2766                 /* replace route list */
2767                 rrt->rrt_next = orrt->rrt_next;
2768                 *orrt = *rrt;
2769                 trace(1, "route: %s/%d flags %s: replace new route\n",
2770                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2771                     rtflags(rtm));
2772                 free(rrt);
2773         } else {
2774                 rrt->rrt_next = riprt;
2775                 riprt = rrt;
2776         }
2777 }
2778
2779 int
2780 addroute(rrt, gw, ifcp)
2781         struct riprt *rrt;
2782         const struct in6_addr *gw;
2783         struct ifc *ifcp;
2784 {
2785         struct  netinfo6 *np;
2786         u_char  buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ];
2787         struct  rt_msghdr       *rtm;
2788         struct  sockaddr_in6    *sin6;
2789         int     len;
2790
2791         np = &rrt->rrt_info;
2792         inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1));
2793         inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2));
2794         tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n",
2795                 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2796                 np->rip6_metric - 1, buf2);
2797         if (rtlog)
2798                 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(),
2799                         inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2800                         np->rip6_metric - 1, buf2);
2801         if (nflag)
2802                 return 0;
2803
2804         memset(buf, 0, sizeof(buf));
2805         rtm = (struct rt_msghdr *)buf;
2806         rtm->rtm_type = RTM_ADD;
2807         rtm->rtm_version = RTM_VERSION;
2808         rtm->rtm_seq = ++seq;
2809         rtm->rtm_pid = pid;
2810         rtm->rtm_flags = rrt->rrt_flags;
2811         rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2812         rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1;
2813         rtm->rtm_inits = RTV_HOPCOUNT;
2814         sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2815         /* Destination */
2816         sin6->sin6_len = sizeof(struct sockaddr_in6);
2817         sin6->sin6_family = AF_INET6;
2818         sin6->sin6_addr = np->rip6_dest;
2819         sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2820         /* Gateway */
2821         sin6->sin6_len = sizeof(struct sockaddr_in6);
2822         sin6->sin6_family = AF_INET6;
2823         sin6->sin6_addr = *gw;
2824         sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2825         /* Netmask */
2826         sin6->sin6_len = sizeof(struct sockaddr_in6);
2827         sin6->sin6_family = AF_INET6;
2828         sin6->sin6_addr = *(plen2mask(np->rip6_plen));
2829         sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2830
2831         len = (char *)sin6 - (char *)buf;
2832         rtm->rtm_msglen = len;
2833         if (write(rtsock, buf, len) > 0)
2834                 return 0;
2835
2836         if (errno == EEXIST) {
2837                 trace(0, "ADD: Route already exists %s/%d gw %s\n",
2838                     inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2839                 if (rtlog)
2840                         fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n",
2841                             inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2842         } else {
2843                 trace(0, "Can not write to rtsock (addroute): %s\n",
2844                     strerror(errno));
2845                 if (rtlog)
2846                         fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2847                             strerror(errno));
2848         }
2849         return -1;
2850 }
2851
2852 int
2853 delroute(np, gw)
2854         struct netinfo6 *np;
2855         struct in6_addr *gw;
2856 {
2857         u_char  buf[BUFSIZ], buf2[BUFSIZ];
2858         struct  rt_msghdr       *rtm;
2859         struct  sockaddr_in6    *sin6;
2860         int     len;
2861
2862         inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2));
2863         tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest),
2864                 np->rip6_plen, buf2);
2865         if (rtlog)
2866                 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n",
2867                         hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2868         if (nflag)
2869                 return 0;
2870
2871         memset(buf, 0, sizeof(buf));
2872         rtm = (struct rt_msghdr *)buf;
2873         rtm->rtm_type = RTM_DELETE;
2874         rtm->rtm_version = RTM_VERSION;
2875         rtm->rtm_seq = ++seq;
2876         rtm->rtm_pid = pid;
2877         rtm->rtm_flags = RTF_UP | RTF_GATEWAY;
2878         if (np->rip6_plen == sizeof(struct in6_addr) * 8)
2879                 rtm->rtm_flags |= RTF_HOST;
2880         rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2881         sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2882         /* Destination */
2883         sin6->sin6_len = sizeof(struct sockaddr_in6);
2884         sin6->sin6_family = AF_INET6;
2885         sin6->sin6_addr = np->rip6_dest;
2886         sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2887         /* Gateway */
2888         sin6->sin6_len = sizeof(struct sockaddr_in6);
2889         sin6->sin6_family = AF_INET6;
2890         sin6->sin6_addr = *gw;
2891         sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2892         /* Netmask */
2893         sin6->sin6_len = sizeof(struct sockaddr_in6);
2894         sin6->sin6_family = AF_INET6;
2895         sin6->sin6_addr = *(plen2mask(np->rip6_plen));
2896         sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2897
2898         len = (char *)sin6 - (char *)buf;
2899         rtm->rtm_msglen = len;
2900         if (write(rtsock, buf, len) >= 0)
2901                 return 0;
2902
2903         if (errno == ESRCH) {
2904                 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n",
2905                     inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2906                 if (rtlog)
2907                         fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n",
2908                             inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2909         } else {
2910                 trace(0, "Can not write to rtsock (delroute): %s\n",
2911                     strerror(errno));
2912                 if (rtlog)
2913                         fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2914                             strerror(errno));
2915         }
2916         return -1;
2917 }
2918
2919 struct in6_addr *
2920 getroute(np, gw)
2921         struct netinfo6 *np;
2922         struct in6_addr *gw;
2923 {
2924         u_char buf[BUFSIZ];
2925         int myseq;
2926         int len;
2927         struct rt_msghdr *rtm;
2928         struct sockaddr_in6 *sin6;
2929
2930         rtm = (struct rt_msghdr *)buf;
2931         len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6);
2932         memset(rtm, 0, len);
2933         rtm->rtm_type = RTM_GET;
2934         rtm->rtm_version = RTM_VERSION;
2935         myseq = ++seq;
2936         rtm->rtm_seq = myseq;
2937         rtm->rtm_addrs = RTA_DST;
2938         rtm->rtm_msglen = len;
2939         sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2940         sin6->sin6_len = sizeof(struct sockaddr_in6);
2941         sin6->sin6_family = AF_INET6;
2942         sin6->sin6_addr = np->rip6_dest;
2943         if (write(rtsock, buf, len) < 0) {
2944                 if (errno == ESRCH)     /* No such route found */
2945                         return NULL;
2946                 perror("write to rtsock");
2947                 exit(1);
2948         }
2949         do {
2950                 if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
2951                         perror("read from rtsock");
2952                         exit(1);
2953                 }
2954                 rtm = (struct rt_msghdr *)buf;
2955         } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid);
2956         sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2957         if (rtm->rtm_addrs & RTA_DST) {
2958                 sin6 = (struct sockaddr_in6 *)
2959                         ((char *)sin6 + ROUNDUP(sin6->sin6_len));
2960         }
2961         if (rtm->rtm_addrs & RTA_GATEWAY) {
2962                 *gw = sin6->sin6_addr;
2963                 return gw;
2964         }
2965         return NULL;
2966 }
2967
2968 const char *
2969 inet6_n2p(p)
2970         const struct in6_addr *p;
2971 {
2972         static char buf[BUFSIZ];
2973
2974         return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf));
2975 }
2976
2977 void
2978 ifrtdump(sig)
2979         int sig;
2980 {
2981
2982         ifdump(sig);
2983         rtdump(sig);
2984 }
2985
2986 void
2987 ifdump(sig)
2988         int sig;
2989 {
2990         struct ifc *ifcp;
2991         FILE *dump;
2992         int i;
2993
2994         if (sig == 0)
2995                 dump = stderr;
2996         else
2997                 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2998                         dump = stderr;
2999
3000         fprintf(dump, "%s: Interface Table Dump\n", hms());
3001         fprintf(dump, "  Number of interfaces: %d\n", nifc);
3002         for (i = 0; i < 2; i++) {
3003                 fprintf(dump, "  %sadvertising interfaces:\n", i ? "non-" : "");
3004                 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
3005                         if (i == 0) {
3006                                 if ((ifcp->ifc_flags & IFF_UP) == 0)
3007                                         continue;
3008                                 if (iff_find(ifcp, 'N') != NULL)
3009                                         continue;
3010                         } else {
3011                                 if (ifcp->ifc_flags & IFF_UP)
3012                                         continue;
3013                         }
3014                         ifdump0(dump, ifcp);
3015                 }
3016         }
3017         fprintf(dump, "\n");
3018         if (dump != stderr)
3019                 fclose(dump);
3020 }
3021
3022 void
3023 ifdump0(dump, ifcp)
3024         FILE *dump;
3025         const struct ifc *ifcp;
3026 {
3027         struct ifac *ifa;
3028         struct iff *iffp;
3029         char buf[BUFSIZ];
3030         const char *ft;
3031         int addr;
3032
3033         fprintf(dump, "    %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n",
3034                 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags),
3035                 inet6_n2p(&ifcp->ifc_mylladdr),
3036                 ifcp->ifc_mtu, ifcp->ifc_metric);
3037         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
3038                 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
3039                         inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr,
3040                                 buf, sizeof(buf));
3041                         fprintf(dump, "\t%s/%d -- %s\n",
3042                                 inet6_n2p(&ifa->ifa_addr),
3043                                 ifa->ifa_plen, buf);
3044                 } else {
3045                         fprintf(dump, "\t%s/%d\n",
3046                                 inet6_n2p(&ifa->ifa_addr),
3047                                 ifa->ifa_plen);
3048                 }
3049         }
3050         if (ifcp->ifc_filter) {
3051                 fprintf(dump, "\tFilter:");
3052                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
3053                         addr = 0;
3054                         switch (iffp->iff_type) {
3055                         case 'A':
3056                                 ft = "Aggregate"; addr++; break;
3057                         case 'N':
3058                                 ft = "No-use"; break;
3059                         case 'O':
3060                                 ft = "Advertise-only"; addr++; break;
3061                         case 'T':
3062                                 ft = "Default-only"; break;
3063                         case 'L':
3064                                 ft = "Listen-only"; addr++; break;
3065                         default:
3066                                 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type);
3067                                 ft = buf;
3068                                 addr++;
3069                                 break;
3070                         }
3071                         fprintf(dump, " %s", ft);
3072                         if (addr) {
3073                                 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr),
3074                                         iffp->iff_plen);
3075                         }
3076                 }
3077                 fprintf(dump, "\n");
3078         }
3079 }
3080
3081 void
3082 rtdump(sig)
3083         int sig;
3084 {
3085         struct  riprt *rrt;
3086         char    buf[BUFSIZ];
3087         FILE    *dump;
3088         time_t  t, age;
3089
3090         if (sig == 0)
3091                 dump = stderr;
3092         else
3093                 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
3094                         dump = stderr;
3095
3096         t = time(NULL);
3097         fprintf(dump, "\n%s: Routing Table Dump\n", hms());
3098         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
3099                 if (rrt->rrt_t == 0)
3100                         age = 0;
3101                 else
3102                         age = t - rrt->rrt_t;
3103                 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest,
3104                         buf, sizeof(buf));
3105                 fprintf(dump, "    %s/%d if(%d:%s) gw(%s) [%d] age(%ld)",
3106                         buf, rrt->rrt_info.rip6_plen, rrt->rrt_index,
3107                         index2ifc[rrt->rrt_index]->ifc_name,
3108                         inet6_n2p(&rrt->rrt_gw),
3109                         rrt->rrt_info.rip6_metric, (long)age);
3110                 if (rrt->rrt_info.rip6_tag) {
3111                         fprintf(dump, " tag(0x%04x)",
3112                                 ntohs(rrt->rrt_info.rip6_tag) & 0xffff);
3113                 }
3114                 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)
3115                         fprintf(dump, " NOT-LL");
3116                 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
3117                         fprintf(dump, " NO-ADV");
3118                 fprintf(dump, "\n");
3119         }
3120         fprintf(dump, "\n");
3121         if (dump != stderr)
3122                 fclose(dump);
3123 }
3124
3125 /*
3126  * Parse the -A (and -O) options and put corresponding filter object to the
3127  * specified interface structures.  Each of the -A/O option has the following
3128  * syntax:      -A 5f09:c400::/32,ef0,ef1  (aggregate)
3129  *              -O 5f09:c400::/32,ef0,ef1  (only when match)
3130  */
3131 void
3132 filterconfig()
3133 {
3134         int i;
3135         char *p, *ap, *iflp, *ifname, *ep;
3136         struct iff ftmp, *iff_obj;
3137         struct ifc *ifcp;
3138         struct riprt *rrt;
3139 #if 0
3140         struct in6_addr gw;
3141 #endif
3142         u_long plen;
3143
3144         for (i = 0; i < nfilter; i++) {
3145                 ap = filter[i];
3146                 iflp = NULL;
3147                 ifcp = NULL;
3148                 if (filtertype[i] == 'N' || filtertype[i] == 'T') {
3149                         iflp = ap;
3150                         goto ifonly;
3151                 }
3152                 if ((p = strchr(ap, ',')) != NULL) {
3153                         *p++ = '\0';
3154                         iflp = p;
3155                 }
3156                 if ((p = strchr(ap, '/')) == NULL) {
3157                         fatal("no prefixlen specified for '%s'", ap);
3158                         /*NOTREACHED*/
3159                 }
3160                 *p++ = '\0';
3161                 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) {
3162                         fatal("invalid prefix specified for '%s'", ap);
3163                         /*NOTREACHED*/
3164                 }
3165                 errno = 0;
3166                 ep = NULL;
3167                 plen = strtoul(p, &ep, 10);
3168                 if (errno || !*p || *ep || plen > sizeof(ftmp.iff_addr) * 8) {
3169                         fatal("invalid prefix length specified for '%s'", ap);
3170                         /*NOTREACHED*/
3171                 }
3172                 ftmp.iff_plen = plen;
3173                 ftmp.iff_next = NULL;
3174                 applyplen(&ftmp.iff_addr, ftmp.iff_plen);
3175 ifonly:
3176                 ftmp.iff_type = filtertype[i];
3177                 if (iflp == NULL || *iflp == '\0') {
3178                         fatal("no interface specified for '%s'", ap);
3179                         /*NOTREACHED*/
3180                 }
3181                 /* parse the interface listing portion */
3182                 while (iflp) {
3183                         ifname = iflp;
3184                         if ((iflp = strchr(iflp, ',')) != NULL)
3185                                 *iflp++ = '\0';
3186                         ifcp = ifc_find(ifname);
3187                         if (ifcp == NULL) {
3188                                 fatal("no interface %s exists", ifname);
3189                                 /*NOTREACHED*/
3190                         }
3191                         iff_obj = (struct iff *)malloc(sizeof(struct iff));
3192                         if (iff_obj == NULL) {
3193                                 fatal("malloc of iff_obj");
3194                                 /*NOTREACHED*/
3195                         }
3196                         memcpy((void *)iff_obj, (void *)&ftmp,
3197                             sizeof(struct iff));
3198                         /* link it to the interface filter */
3199                         iff_obj->iff_next = ifcp->ifc_filter;
3200                         ifcp->ifc_filter = iff_obj;
3201                 }
3202
3203                 /*
3204                  * -A: aggregate configuration.
3205                  */
3206                 if (filtertype[i] != 'A')
3207                         continue;
3208                 /* put the aggregate to the kernel routing table */
3209                 rrt = (struct riprt *)malloc(sizeof(struct riprt));
3210                 if (rrt == NULL) {
3211                         fatal("malloc: rrt");
3212                         /*NOTREACHED*/
3213                 }
3214                 memset(rrt, 0, sizeof(struct riprt));
3215                 rrt->rrt_info.rip6_dest = ftmp.iff_addr;
3216                 rrt->rrt_info.rip6_plen = ftmp.iff_plen;
3217                 rrt->rrt_info.rip6_metric = 1;
3218                 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
3219                 rrt->rrt_gw = in6addr_loopback;
3220                 rrt->rrt_flags = RTF_UP | RTF_REJECT;
3221                 rrt->rrt_rflags = RRTF_AGGREGATE;
3222                 rrt->rrt_t = 0;
3223                 rrt->rrt_index = loopifcp->ifc_index;
3224 #if 0
3225                 if (getroute(&rrt->rrt_info, &gw)) {
3226 #if 0
3227                         /*
3228                          * When the address has already been registered in the
3229                          * kernel routing table, it should be removed
3230                          */
3231                         delroute(&rrt->rrt_info, &gw);
3232 #else
3233                         /* it is safer behavior */
3234                         errno = EINVAL;
3235                         fatal("%s/%u already in routing table, "
3236                             "cannot aggregate",
3237                             inet6_n2p(&rrt->rrt_info.rip6_dest),
3238                             rrt->rrt_info.rip6_plen);
3239                         /*NOTREACHED*/
3240 #endif
3241                 }
3242 #endif
3243                 /* Put the route to the list */
3244                 rrt->rrt_next = riprt;
3245                 riprt = rrt;
3246                 trace(1, "Aggregate: %s/%d for %s\n",
3247                         inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen,
3248                         ifcp->ifc_name);
3249                 /* Add this route to the kernel */
3250                 if (nflag)      /* do not modify kernel routing table */
3251                         continue;
3252                 addroute(rrt, &in6addr_loopback, loopifcp);
3253         }
3254 }
3255
3256 /***************** utility functions *****************/
3257
3258 /*
3259  * Returns a pointer to ifac whose address and prefix length matches
3260  * with the address and prefix length specified in the arguments.
3261  */
3262 struct ifac *
3263 ifa_match(ifcp, ia, plen)
3264         const struct ifc *ifcp;
3265         const struct in6_addr *ia;
3266         int plen;
3267 {
3268         struct ifac *ifa;
3269
3270         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
3271                 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) &&
3272                     ifa->ifa_plen == plen)
3273                         break;
3274         }
3275         return ifa;
3276 }
3277
3278 /*
3279  * Return a pointer to riprt structure whose address and prefix length
3280  * matches with the address and prefix length found in the argument.
3281  * Note: This is not a rtalloc().  Therefore exact match is necessary.
3282  */
3283 struct riprt *
3284 rtsearch(np, prev_rrt)
3285         struct  netinfo6 *np;
3286         struct  riprt **prev_rrt;
3287 {
3288         struct  riprt   *rrt;
3289
3290         if (prev_rrt)
3291                 *prev_rrt = NULL;
3292         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
3293                 if (rrt->rrt_info.rip6_plen == np->rip6_plen &&
3294                     IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
3295                                        &np->rip6_dest))
3296                         return rrt;
3297                 if (prev_rrt)
3298                         *prev_rrt = rrt;
3299         }
3300         if (prev_rrt)
3301                 *prev_rrt = NULL;
3302         return 0;
3303 }
3304
3305 int
3306 sin6mask2len(sin6)
3307         const struct sockaddr_in6 *sin6;
3308 {
3309
3310         return mask2len(&sin6->sin6_addr,
3311             sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr));
3312 }
3313
3314 int
3315 mask2len(addr, lenlim)
3316         const struct in6_addr *addr;
3317         int lenlim;
3318 {
3319         int i = 0, j;
3320         const u_char *p = (const u_char *)addr;
3321
3322         for (j = 0; j < lenlim; j++, p++) {
3323                 if (*p != 0xff)
3324                         break;
3325                 i += 8;
3326         }
3327         if (j < lenlim) {
3328                 switch (*p) {
3329 #define MASKLEN(m, l)   case m: do { i += l; break; } while (0)
3330                 MASKLEN(0xfe, 7); break;
3331                 MASKLEN(0xfc, 6); break;
3332                 MASKLEN(0xf8, 5); break;
3333                 MASKLEN(0xf0, 4); break;
3334                 MASKLEN(0xe0, 3); break;
3335                 MASKLEN(0xc0, 2); break;
3336                 MASKLEN(0x80, 1); break;
3337 #undef  MASKLEN
3338                 }
3339         }
3340         return i;
3341 }
3342
3343 void
3344 applymask(addr, mask)
3345         struct in6_addr *addr, *mask;
3346 {
3347         int     i;
3348         u_long  *p, *q;
3349
3350         p = (u_long *)addr; q = (u_long *)mask;
3351         for (i = 0; i < 4; i++)
3352                 *p++ &= *q++;
3353 }
3354
3355 static const u_char plent[8] = {
3356         0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
3357 };
3358
3359 void
3360 applyplen(ia, plen)
3361         struct  in6_addr *ia;
3362         int     plen;
3363 {
3364         u_char  *p;
3365         int     i;
3366
3367         p = ia->s6_addr;
3368         for (i = 0; i < 16; i++) {
3369                 if (plen <= 0)
3370                         *p = 0;
3371                 else if (plen < 8)
3372                         *p &= plent[plen];
3373                 p++, plen -= 8;
3374         }
3375 }
3376
3377 static const int pl2m[9] = {
3378         0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
3379 };
3380
3381 struct in6_addr *
3382 plen2mask(n)
3383         int     n;
3384 {
3385         static struct in6_addr ia;
3386         u_char  *p;
3387         int     i;
3388
3389         memset(&ia, 0, sizeof(struct in6_addr));
3390         p = (u_char *)&ia;
3391         for (i = 0; i < 16; i++, p++, n -= 8) {
3392                 if (n >= 8) {
3393                         *p = 0xff;
3394                         continue;
3395                 }
3396                 *p = pl2m[n];
3397                 break;
3398         }
3399         return &ia;
3400 }
3401
3402 char *
3403 allocopy(p)
3404         char *p;
3405 {
3406         int len = strlen(p) + 1;
3407         char *q = (char *)malloc(len);
3408
3409         if (!q) {
3410                 fatal("malloc");
3411                 /*NOTREACHED*/
3412         }
3413
3414         strlcpy(q, p, len);
3415         return q;
3416 }
3417
3418 char *
3419 hms()
3420 {
3421         static char buf[BUFSIZ];
3422         time_t t;
3423         struct  tm *tm;
3424
3425         t = time(NULL);
3426         if ((tm = localtime(&t)) == 0) {
3427                 fatal("localtime");
3428                 /*NOTREACHED*/
3429         }
3430         snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min,
3431             tm->tm_sec);
3432         return buf;
3433 }
3434
3435 #define RIPRANDDEV      1.0     /* 30 +- 15, max - min = 30 */
3436
3437 int
3438 ripinterval(timer)
3439         int timer;
3440 {
3441         double r = rand();
3442
3443         interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5));
3444         nextalarm = time(NULL) + interval;
3445         return interval;
3446 }
3447
3448 time_t
3449 ripsuptrig()
3450 {
3451         time_t t;
3452
3453         double r = rand();
3454         t  = (int)(RIP_TRIG_INT6_MIN +
3455                 (RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX));
3456         sup_trig_update = time(NULL) + t;
3457         return t;
3458 }
3459
3460 void
3461 #ifdef __STDC__
3462 fatal(const char *fmt, ...)
3463 #else
3464 fatal(fmt, va_alist)
3465         char    *fmt;
3466         va_dcl
3467 #endif
3468 {
3469         va_list ap;
3470         char buf[1024];
3471
3472 #ifdef __STDC__
3473         va_start(ap, fmt);
3474 #else
3475         va_start(ap);
3476 #endif
3477         vsnprintf(buf, sizeof(buf), fmt, ap);
3478         va_end(ap);
3479         perror(buf);
3480         if (errno)
3481                 syslog(LOG_ERR, "%s: %s", buf, strerror(errno));
3482         else
3483                 syslog(LOG_ERR, "%s", buf);
3484         rtdexit();
3485 }
3486
3487 void
3488 #ifdef __STDC__
3489 tracet(int level, const char *fmt, ...)
3490 #else
3491 tracet(level, fmt, va_alist)
3492         int level;
3493         char *fmt;
3494         va_dcl
3495 #endif
3496 {
3497         va_list ap;
3498
3499         if (level <= dflag) {
3500 #ifdef __STDC__
3501                 va_start(ap, fmt);
3502 #else
3503                 va_start(ap);
3504 #endif
3505                 fprintf(stderr, "%s: ", hms());
3506                 vfprintf(stderr, fmt, ap);
3507                 va_end(ap);
3508         }
3509         if (dflag) {
3510 #ifdef __STDC__
3511                 va_start(ap, fmt);
3512 #else
3513                 va_start(ap);
3514 #endif
3515                 if (level > 0)
3516                         vsyslog(LOG_DEBUG, fmt, ap);
3517                 else
3518                         vsyslog(LOG_WARNING, fmt, ap);
3519                 va_end(ap);
3520         }
3521 }
3522
3523 void
3524 #ifdef __STDC__
3525 trace(int level, const char *fmt, ...)
3526 #else
3527 trace(level, fmt, va_alist)
3528         int level;
3529         char *fmt;
3530         va_dcl
3531 #endif
3532 {
3533         va_list ap;
3534
3535         if (level <= dflag) {
3536 #ifdef __STDC__
3537                 va_start(ap, fmt);
3538 #else
3539                 va_start(ap);
3540 #endif
3541                 vfprintf(stderr, fmt, ap);
3542                 va_end(ap);
3543         }
3544         if (dflag) {
3545 #ifdef __STDC__
3546                 va_start(ap, fmt);
3547 #else
3548                 va_start(ap);
3549 #endif
3550                 if (level > 0)
3551                         vsyslog(LOG_DEBUG, fmt, ap);
3552                 else
3553                         vsyslog(LOG_WARNING, fmt, ap);
3554                 va_end(ap);
3555         }
3556 }
3557
3558 unsigned int
3559 if_maxindex()
3560 {
3561         struct if_nameindex *p, *p0;
3562         unsigned int max = 0;
3563
3564         p0 = if_nameindex();
3565         for (p = p0; p && p->if_index && p->if_name; p++) {
3566                 if (max < p->if_index)
3567                         max = p->if_index;
3568         }
3569         if_freenameindex(p0);
3570         return max;
3571 }
3572
3573 struct ifc *
3574 ifc_find(name)
3575         char *name;
3576 {
3577         struct ifc *ifcp;
3578
3579         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
3580                 if (strcmp(name, ifcp->ifc_name) == 0)
3581                         return ifcp;
3582         }
3583         return (struct ifc *)NULL;
3584 }
3585
3586 struct iff *
3587 iff_find(ifcp, type)
3588         struct ifc *ifcp;
3589         int type;
3590 {
3591         struct iff *iffp;
3592
3593         for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
3594                 if (iffp->iff_type == type)
3595                         return iffp;
3596         }
3597         return NULL;
3598 }
3599
3600 void
3601 setindex2ifc(idx, ifcp)
3602         int idx;
3603         struct ifc *ifcp;
3604 {
3605         int n, nsize;
3606         struct ifc **p;
3607
3608         if (!index2ifc) {
3609                 nindex2ifc = 5; /*initial guess*/
3610                 index2ifc = (struct ifc **)
3611                         malloc(sizeof(*index2ifc) * nindex2ifc);
3612                 if (index2ifc == NULL) {
3613                         fatal("malloc");
3614                         /*NOTREACHED*/
3615                 }
3616                 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc);
3617         }
3618         n = nindex2ifc;
3619         for (nsize = nindex2ifc; nsize <= idx; nsize *= 2)
3620                 ;
3621         if (n != nsize) {
3622                 p = (struct ifc **)realloc(index2ifc,
3623                     sizeof(*index2ifc) * nsize);
3624                 if (p == NULL) {
3625                         fatal("realloc");
3626                         /*NOTREACHED*/
3627                 }
3628                 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n));
3629                 index2ifc = p;
3630                 nindex2ifc = nsize;
3631         }
3632         index2ifc[idx] = ifcp;
3633 }