usr.sbin/route6d/route6d.c

   1 /*      $FreeBSD: src/usr.sbin/route6d/route6d.c,v 1.2.2.5 2001/07/03 11:02:09 ume Exp $        */
   2 /*      $DragonFly: src/usr.sbin/route6d/route6d.c,v 1.5 2004/02/10 02:59:43 rob Exp $  */
   3 /*      $KAME: route6d.c,v 1.64 2001/05/08 04:36:37 itojun Exp $        */
   4
   5 /*
   6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * $KAME: route6d.c,v 1.64 2001/05/08 04:36:37 itojun Exp $
  34  */
  35
  36 #define _KERNEL_STRUCTURES
  37
  38 #include <stdio.h>
  39
  40 #include <time.h>
  41 #include <unistd.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <signal.h>
  45 #ifdef __STDC__
  46 #include <stdarg.h>
  47 #else
  48 #include <varargs.h>
  49 #endif
  50 #include <syslog.h>
  51 #include <stddef.h>
  52 #include <errno.h>
  53 #include <err.h>
  54
  55 #include <sys/types.h>
  56 #include <sys/param.h>
  57 #include <sys/file.h>
  58 #include <sys/socket.h>
  59 #include <sys/ioctl.h>
  60 #include <sys/sysctl.h>
  61 #include <sys/uio.h>
  62 #include <net/if.h>
  63 #if defined(__DragonFly__)
  64 #include <net/if_var.h>
  65 #endif /* __DragonFly__  */
  66 #include <net/route.h>
  67 #include <netinet/in.h>
  68 #include <netinet/in_var.h>
  69 #include <netinet/ip6.h>
  70 #include <netinet/udp.h>
  71 #include <netdb.h>
  72 #include <ifaddrs.h>
  73
  74 #include <arpa/inet.h>
  75
  76 #include "route6d.h"
  77
  78 #define MAXFILTER       40
  79
  80 #ifdef  DEBUG
  81 #define INIT_INTERVAL6  6
  82 #else
  83 #define INIT_INTERVAL6  10      /* Wait to submit a initial riprequest */
  84 #endif
  85
  86 /* alignment constraint for routing socket */
  87 #define ROUNDUP(a) \
  88         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
  89 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
  90
  91 /*
  92  * Following two macros are highly depending on KAME Release
  93  */
  94 #define IN6_LINKLOCAL_IFINDEX(addr) \
  95         ((addr).s6_addr[2] << 8 | (addr).s6_addr[3])
  96
  97 #define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \
  98         do { \
  99                 (addr).s6_addr[2] = ((index) >> 8) & 0xff; \
 100                 (addr).s6_addr[3] = (index) & 0xff; \
 101         } while (0)
 102
 103 struct  ifc {                   /* Configuration of an interface */
 104         char    *ifc_name;                      /* if name */
 105         struct  ifc *ifc_next;
 106         int     ifc_index;                      /* if index */
 107         int     ifc_mtu;                        /* if mtu */
 108         int     ifc_metric;                     /* if metric */
 109         u_int   ifc_flags;                      /* flags */
 110         short   ifc_cflags;                     /* IFC_XXX */
 111         struct  in6_addr ifc_mylladdr;          /* my link-local address */
 112         struct  sockaddr_in6 ifc_ripsin;        /* rip multicast address */
 113         struct  iff *ifc_filter;                /* filter structure */
 114         struct  ifac *ifc_addr;                 /* list of AF_INET6 addresses */
 115         int     ifc_joined;                     /* joined to ff02::9 */
 116 };
 117
 118 struct  ifac {                  /* Adddress associated to an interface */
 119         struct  ifc *ifa_conf;          /* back pointer */
 120         struct  ifac *ifa_next;
 121         struct  in6_addr ifa_addr;      /* address */
 122         struct  in6_addr ifa_raddr;     /* remote address, valid in p2p */
 123         int     ifa_plen;               /* prefix length */
 124 };
 125
 126 struct  iff {
 127         int     iff_type;
 128         struct  in6_addr iff_addr;
 129         int     iff_plen;
 130         struct  iff *iff_next;
 131 };
 132
 133 struct  ifc *ifc;
 134 int     nifc;           /* number of valid ifc's */
 135 struct  ifc **index2ifc;
 136 int     nindex2ifc;
 137 struct  ifc *loopifcp = NULL;   /* pointing to loopback */
 138 int     loopifindex = 0;        /* ditto */
 139 fd_set  sockvec;        /* vector to select() for receiving */
 140 int     rtsock;         /* the routing socket */
 141 int     ripsock;        /* socket to send/receive RIP datagram */
 142
 143 struct  rip6 *ripbuf;   /* packet buffer for sending */
 144
 145 /*
 146  * Maintain the routes in a linked list.  When the number of the routes
 147  * grows, somebody would like to introduce a hash based or a radix tree
 148  * based structure.  I believe the number of routes handled by RIP is
 149  * limited and I don't have to manage a complex data structure, however.
 150  *
 151  * One of the major drawbacks of the linear linked list is the difficulty
 152  * of representing the relationship between a couple of routes.  This may
 153  * be a significant problem when we have to support route aggregation with
 154  * supressing the specifices covered by the aggregate.
 155  */
 156
 157 struct  riprt {
 158         struct  riprt *rrt_next;        /* next destination */
 159         struct  riprt *rrt_same;        /* same destination - future use */
 160         struct  netinfo6 rrt_info;      /* network info */
 161         struct  in6_addr rrt_gw;        /* gateway */
 162         u_long  rrt_flags;              /* kernel routing table flags */
 163         u_long  rrt_rflags;             /* route6d routing table flags */
 164         time_t  rrt_t;                  /* when the route validated */
 165         int     rrt_index;              /* ifindex from which this route got */
 166 };
 167
 168 struct  riprt *riprt = 0;
 169
 170 int     dflag = 0;      /* debug flag */
 171 int     qflag = 0;      /* quiet flag */
 172 int     nflag = 0;      /* don't update kernel routing table */
 173 int     aflag = 0;      /* age out even the statically defined routes */
 174 int     hflag = 0;      /* don't split horizon */
 175 int     lflag = 0;      /* exchange site local routes */
 176 int     sflag = 0;      /* announce static routes w/ split horizon */
 177 int     Sflag = 0;      /* announce static routes to every interface */
 178 unsigned long routetag = 0;     /* route tag attached on originating case */
 179
 180 char    *filter[MAXFILTER];
 181 int     filtertype[MAXFILTER];
 182 int     nfilter = 0;
 183
 184 pid_t   pid;
 185
 186 struct  sockaddr_storage ripsin;
 187
 188 struct  rtentry rtentry;
 189
 190 int     interval = 1;
 191 time_t  nextalarm = 0;
 192 time_t  sup_trig_update = 0;
 193
 194 FILE    *rtlog = NULL;
 195
 196 int logopened = 0;
 197
 198 static  u_long  seq = 0;
 199
 200 volatile int signo;
 201 volatile sig_atomic_t seenalrm;
 202 volatile sig_atomic_t seenquit;
 203 volatile sig_atomic_t seenusr1;
 204
 205 #define RRTF_AGGREGATE          0x08000000
 206 #define RRTF_NOADVERTISE        0x10000000
 207 #define RRTF_NH_NOT_LLADDR      0x20000000
 208 #define RRTF_SENDANYWAY         0x40000000
 209 #define RRTF_CHANGED            0x80000000
 210
 211 int main(int, char **);
 212 void sighandler(int);
 213 void ripalarm(void);
 214 void riprecv(void);
 215 void ripsend(struct ifc *, struct sockaddr_in6 *, int);
 216 int out_filter(struct riprt *, struct ifc *);
 217 void init(void);
 218 void sockopt(struct ifc *);
 219 void ifconfig(void);
 220 void ifconfig1(const char *, const struct sockaddr *, struct ifc *, int);
 221 void rtrecv(void);
 222 int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *,
 223         const struct sockaddr_in6 *);
 224 int rt_deladdr(struct ifc *, const struct sockaddr_in6 *,
 225         const struct sockaddr_in6 *);
 226 void filterconfig(void);
 227 int getifmtu(int);
 228 const char *rttypes(struct rt_msghdr *);
 229 const char *rtflags(struct rt_msghdr *);
 230 const char *ifflags(int);
 231 int ifrt(struct ifc *, int);
 232 void ifrt_p2p(struct ifc *, int);
 233 void applymask(struct in6_addr *, struct in6_addr *);
 234 void applyplen(struct in6_addr *, int);
 235 void ifrtdump(int);
 236 void ifdump(int);
 237 void ifdump0(FILE *, const struct ifc *);
 238 void rtdump(int);
 239 void rt_entry(struct rt_msghdr *, int);
 240 void rtdexit(void);
 241 void riprequest(struct ifc *, struct netinfo6 *, int,
 242         struct sockaddr_in6 *);
 243 void ripflush(struct ifc *, struct sockaddr_in6 *);
 244 void sendrequest(struct ifc *);
 245 int sin6mask2len(const struct sockaddr_in6 *);
 246 int mask2len(const struct in6_addr *, int);
 247 int sendpacket(struct sockaddr_in6 *, int);
 248 int addroute(struct riprt *, const struct in6_addr *, struct ifc *);
 249 int delroute(struct netinfo6 *, struct in6_addr *);
 250 struct in6_addr *getroute(struct netinfo6 *, struct in6_addr *);
 251 void krtread(int);
 252 int tobeadv(struct riprt *, struct ifc *);
 253 char *allocopy(char *);
 254 char *hms(void);
 255 const char *inet6_n2p(const struct in6_addr *);
 256 struct ifac *ifa_match(const struct ifc *, const struct in6_addr *, int);
 257 struct in6_addr *plen2mask(int);
 258 struct riprt *rtsearch(struct netinfo6 *, struct riprt **);
 259 int ripinterval(int);
 260 time_t ripsuptrig(void);
 261 void fatal(const char *, ...)
 262         __attribute__((__format__(__printf__, 1, 2)));
 263 void trace(int, const char *, ...)
 264         __attribute__((__format__(__printf__, 2, 3)));
 265 void tracet(int, const char *, ...)
 266         __attribute__((__format__(__printf__, 2, 3)));
 267 unsigned int if_maxindex(void);
 268 struct ifc *ifc_find(char *);
 269 struct iff *iff_find(struct ifc *, int);
 270 void setindex2ifc(int, struct ifc *);
 271
 272 #define MALLOC(type)    ((type *)malloc(sizeof(type)))
 273
 274 int
 275 main(argc, argv)
 276         int     argc;
 277         char    **argv;
 278 {
 279         int     ch;
 280         int     error = 0;
 281         struct  ifc *ifcp;
 282         sigset_t mask, omask;
 283         FILE    *pidfile;
 284         char *progname;
 285         char *ep;
 286
 287         progname = strrchr(*argv, '/');
 288         if (progname)
 289                 progname++;
 290         else
 291                 progname = *argv;
 292
 293         pid = getpid();
 294         while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) {
 295                 switch (ch) {
 296                 case 'A':
 297                 case 'N':
 298                 case 'O':
 299                 case 'T':
 300                 case 'L':
 301                         if (nfilter >= MAXFILTER) {
 302                                 fatal("Exceeds MAXFILTER");
 303                                 /*NOTREACHED*/
 304                         }
 305                         filtertype[nfilter] = ch;
 306                         filter[nfilter++] = allocopy(optarg);
 307                         break;
 308                 case 't':
 309                         ep = NULL;
 310                         routetag = strtoul(optarg, &ep, 0);
 311                         if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) {
 312                                 fatal("invalid route tag");
 313                                 /*NOTREACHED*/
 314                         }
 315                         break;
 316                 case 'R':
 317                         if ((rtlog = fopen(optarg, "w")) == NULL) {
 318                                 fatal("Can not write to routelog");
 319                                 /*NOTREACHED*/
 320                         }
 321                         break;
 322 #define FLAG(c, flag, n)        case c: do { flag = n; break; } while(0)
 323                 FLAG('a', aflag, 1); break;
 324                 FLAG('d', dflag, 1); break;
 325                 FLAG('D', dflag, 2); break;
 326                 FLAG('h', hflag, 1); break;
 327                 FLAG('l', lflag, 1); break;
 328                 FLAG('n', nflag, 1); break;
 329                 FLAG('q', qflag, 1); break;
 330                 FLAG('s', sflag, 1); break;
 331                 FLAG('S', Sflag, 1); break;
 332 #undef  FLAG
 333                 default:
 334                         fatal("Invalid option specified, terminating");
 335                         /*NOTREACHED*/
 336                 }
 337         }
 338         argc -= optind;
 339         argv += optind;
 340         if (argc > 0) {
 341                 fatal("bogus extra arguments");
 342                 /*NOTREACHED*/
 343         }
 344
 345         if (geteuid()) {
 346                 nflag = 1;
 347                 fprintf(stderr, "No kernel update is allowed\n");
 348         }
 349         openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
 350         logopened++;
 351
 352         if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL)
 353                 fatal("malloc");
 354         memset(ripbuf, 0, RIP6_MAXMTU);
 355         ripbuf->rip6_cmd = RIP6_RESPONSE;
 356         ripbuf->rip6_vers = RIP6_VERSION;
 357         ripbuf->rip6_res1[0] = 0;
 358         ripbuf->rip6_res1[1] = 0;
 359
 360         init();
 361         ifconfig();
 362         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
 363                 if (ifcp->ifc_index < 0) {
 364                         fprintf(stderr,
 365 "No ifindex found at %s (no link-local address?)\n",
 366                                 ifcp->ifc_name);
 367                         error++;
 368                 }
 369         }
 370         if (error)
 371                 exit(1);
 372         if (loopifcp == NULL) {
 373                 fatal("No loopback found");
 374                 /*NOTREACHED*/
 375         }
 376         loopifindex = loopifcp->ifc_index;
 377         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
 378                 ifrt(ifcp, 0);
 379         filterconfig();
 380         krtread(0);
 381         if (dflag)
 382                 ifrtdump(0);
 383
 384         if (dflag == 0) {
 385 #if 1
 386                 if (daemon(0, 0) < 0) {
 387                         fatal("daemon");
 388                         /*NOTREACHED*/
 389                 }
 390 #else
 391                 if (fork())
 392                         exit(0);
 393                 if (setsid() < 0) {
 394                         fatal("setid");
 395                         /*NOTREACHED*/
 396                 }
 397 #endif
 398         }
 399         pid = getpid();
 400         if ((pidfile = fopen(ROUTE6D_PID, "w")) != NULL) {
 401                 fprintf(pidfile, "%d\n", pid);
 402                 fclose(pidfile);
 403         }
 404
 405         if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) {
 406                 fatal("malloc");
 407                 /*NOTREACHED*/
 408         }
 409         memset(ripbuf, 0, RIP6_MAXMTU);
 410         ripbuf->rip6_cmd = RIP6_RESPONSE;
 411         ripbuf->rip6_vers = RIP6_VERSION;
 412         ripbuf->rip6_res1[0] = 0;
 413         ripbuf->rip6_res1[1] = 0;
 414
 415         if (signal(SIGALRM, sighandler) == SIG_ERR ||
 416             signal(SIGQUIT, sighandler) == SIG_ERR ||
 417             signal(SIGTERM, sighandler) == SIG_ERR ||
 418             signal(SIGUSR1, sighandler) == SIG_ERR ||
 419             signal(SIGHUP, sighandler) == SIG_ERR ||
 420             signal(SIGINT, sighandler) == SIG_ERR) {
 421                 fatal("signal");
 422                 /*NOTREACHED*/
 423         }
 424         /*
 425          * To avoid rip packet congestion (not on a cable but in this
 426          * process), wait for a moment to send the first RIP6_RESPONSE
 427          * packets.
 428          */
 429         alarm(ripinterval(INIT_INTERVAL6));
 430
 431         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
 432                 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
 433                         sendrequest(ifcp);
 434         }
 435
 436         syslog(LOG_INFO, "**** Started ****");
 437         sigemptyset(&mask);
 438         sigaddset(&mask, SIGALRM);
 439         while (1) {
 440                 fd_set  recvec;
 441
 442                 if (seenalrm) {
 443                         ripalarm();
 444                         seenalrm = 0;
 445                         continue;
 446                 }
 447                 if (seenquit) {
 448                         rtdexit();
 449                         seenquit = 0;
 450                         continue;
 451                 }
 452                 if (seenusr1) {
 453                         ifrtdump(SIGUSR1);
 454                         seenusr1 = 0;
 455                         continue;
 456                 }
 457
 458                 FD_COPY(&sockvec, &recvec);
 459                 signo = 0;
 460                 switch (select(FD_SETSIZE, &recvec, 0, 0, 0)) {
 461                 case -1:
 462                         if (errno != EINTR) {
 463                                 fatal("select");
 464                                 /*NOTREACHED*/
 465                         }
 466                         continue;
 467                 case 0:
 468                         continue;
 469                 default:
 470                         if (FD_ISSET(ripsock, &recvec)) {
 471                                 sigprocmask(SIG_BLOCK, &mask, &omask);
 472                                 riprecv();
 473                                 sigprocmask(SIG_SETMASK, &omask, NULL);
 474                         }
 475                         if (FD_ISSET(rtsock, &recvec)) {
 476                                 sigprocmask(SIG_BLOCK, &mask, &omask);
 477                                 rtrecv();
 478                                 sigprocmask(SIG_SETMASK, &omask, NULL);
 479                         }
 480                 }
 481         }
 482 }
 483
 484 void
 485 sighandler(sig)
 486         int sig;
 487 {
 488
 489         signo = sig;
 490         switch (signo) {
 491         case SIGALRM:
 492                 seenalrm++;
 493                 break;
 494         case SIGQUIT:
 495         case SIGTERM:
 496                 seenquit++;
 497                 break;
 498         case SIGUSR1:
 499         case SIGHUP:
 500         case SIGINT:
 501                 seenusr1++;
 502                 break;
 503         }
 504 }
 505
 506 /*
 507  * gracefully exits after resetting sockopts.
 508  */
 509 /* ARGSUSED */
 510 void
 511 rtdexit()
 512 {
 513         struct  riprt *rrt;
 514
 515         alarm(0);
 516         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
 517                 if (rrt->rrt_rflags & RRTF_AGGREGATE) {
 518                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
 519                 }
 520         }
 521         close(ripsock);
 522         close(rtsock);
 523         syslog(LOG_INFO, "**** Terminated ****");
 524         closelog();
 525         exit(1);
 526 }
 527
 528 /*
 529  * Called periodically:
 530  *      1. age out the learned route. remove it if necessary.
 531  *      2. submit RIP6_RESPONSE packets.
 532  * Invoked in every SUPPLY_INTERVAL6 (30) seconds.  I believe we don't have
 533  * to invoke this function in every 1 or 5 or 10 seconds only to age the
 534  * routes more precisely.
 535  */
 536 /* ARGSUSED */
 537 void
 538 ripalarm()
 539 {
 540         struct  ifc *ifcp;
 541         struct  riprt *rrt, *rrt_prev, *rrt_next;
 542         time_t  t_lifetime, t_holddown;
 543
 544         /* age the RIP routes */
 545         rrt_prev = 0;
 546         t_lifetime = time(NULL) - RIP_LIFETIME;
 547         t_holddown = t_lifetime - RIP_HOLDDOWN;
 548         for (rrt = riprt; rrt; rrt = rrt_next) {
 549                 rrt_next = rrt->rrt_next;
 550
 551                 if (rrt->rrt_t == 0) {
 552                         rrt_prev = rrt;
 553                         continue;
 554                 }
 555                 if (rrt->rrt_t < t_holddown) {
 556                         if (rrt_prev) {
 557                                 rrt_prev->rrt_next = rrt->rrt_next;
 558                         } else {
 559                                 riprt = rrt->rrt_next;
 560                         }
 561                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
 562                         free(rrt);
 563                         continue;
 564                 }
 565                 if (rrt->rrt_t < t_lifetime)
 566                         rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
 567                 rrt_prev = rrt;
 568         }
 569         /* Supply updates */
 570         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
 571                 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
 572                         ripsend(ifcp, &ifcp->ifc_ripsin, 0);
 573         }
 574         alarm(ripinterval(SUPPLY_INTERVAL6));
 575 }
 576
 577 void
 578 init()
 579 {
 580         int     i, int0, int255, error;
 581         struct  addrinfo hints, *res;
 582         char    port[10];
 583
 584         ifc = (struct ifc *)NULL;
 585         nifc = 0;
 586         nindex2ifc = 0; /*initial guess*/
 587         index2ifc = NULL;
 588         snprintf(port, sizeof(port), "%d", RIP6_PORT);
 589
 590         memset(&hints, 0, sizeof(hints));
 591         hints.ai_family = PF_INET6;
 592         hints.ai_socktype = SOCK_DGRAM;
 593         hints.ai_flags = AI_PASSIVE;
 594         error = getaddrinfo(NULL, port, &hints, &res);
 595         if (error) {
 596                 fatal("%s", gai_strerror(error));
 597                 /*NOTREACHED*/
 598         }
 599         if (res->ai_next) {
 600                 fatal(":: resolved to multiple address");
 601                 /*NOTREACHED*/
 602         }
 603
 604         int0 = 0; int255 = 255;
 605         ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
 606         if (ripsock < 0) {
 607                 fatal("rip socket");
 608                 /*NOTREACHED*/
 609         }
 610         if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) {
 611                 fatal("rip bind");
 612                 /*NOTREACHED*/
 613         }
 614         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
 615             &int255, sizeof(int255)) < 0) {
 616                 fatal("rip IPV6_MULTICAST_HOPS");
 617                 /*NOTREACHED*/
 618         }
 619         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
 620             &int0, sizeof(int0)) < 0) {
 621                 fatal("rip IPV6_MULTICAST_LOOP");
 622                 /*NOTREACHED*/
 623         }
 624
 625         i = 1;
 626 #ifdef IPV6_RECVPKTINFO
 627         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i,
 628             sizeof(i)) < 0) {
 629                 fatal("rip IPV6_RECVPKTINFO");
 630                 /*NOTREACHED*/
 631         }
 632 #else  /* old adv. API */
 633         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, &i,
 634             sizeof(i)) < 0) {
 635                 fatal("rip IPV6_PKTINFO");
 636                 /*NOTREACHED*/
 637         }
 638 #endif
 639
 640         memset(&hints, 0, sizeof(hints));
 641         hints.ai_family = PF_INET6;
 642         hints.ai_socktype = SOCK_DGRAM;
 643         error = getaddrinfo(RIP6_DEST, port, &hints, &res);
 644         if (error) {
 645                 fatal("%s", gai_strerror(error));
 646                 /*NOTREACHED*/
 647         }
 648         if (res->ai_next) {
 649                 fatal("%s resolved to multiple address", RIP6_DEST);
 650                 /*NOTREACHED*/
 651         }
 652         memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
 653
 654 #ifdef FD_ZERO
 655         FD_ZERO(&sockvec);
 656 #else
 657         memset(&sockvec, 0, sizeof(sockvec));
 658 #endif
 659         FD_SET(ripsock, &sockvec);
 660
 661         if (nflag == 0) {
 662                 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
 663                         fatal("route socket");
 664                         /*NOTREACHED*/
 665                 }
 666                 FD_SET(rtsock, &sockvec);
 667         } else
 668                 rtsock = -1;    /*just for safety */
 669 }
 670
 671 #define RIPSIZE(n) \
 672         (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6))
 673
 674 /*
 675  * ripflush flushes the rip datagram stored in the rip buffer
 676  */
 677 static int nrt;
 678 static struct netinfo6 *np;
 679
 680 void
 681 ripflush(ifcp, sin)
 682         struct ifc *ifcp;
 683         struct sockaddr_in6 *sin;
 684 {
 685         int i;
 686         int error;
 687
 688         if (ifcp)
 689                 tracet(1, "Send(%s): info(%d) to %s.%d\n",
 690                         ifcp->ifc_name, nrt,
 691                         inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port));
 692         else
 693                 tracet(1, "Send: info(%d) to %s.%d\n",
 694                         nrt, inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port));
 695         if (dflag >= 2) {
 696                 np = ripbuf->rip6_nets;
 697                 for (i = 0; i < nrt; i++, np++) {
 698                         if (np->rip6_metric == NEXTHOP_METRIC) {
 699                                 if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest))
 700                                         trace(2, "    NextHop reset");
 701                                 else {
 702                                         trace(2, "    NextHop %s",
 703                                                 inet6_n2p(&np->rip6_dest));
 704                                 }
 705                         } else {
 706                                 trace(2, "    %s/%d[%d]",
 707                                         inet6_n2p(&np->rip6_dest),
 708                                         np->rip6_plen, np->rip6_metric);
 709                         }
 710                         if (np->rip6_tag) {
 711                                 trace(2, "  tag=0x%04x",
 712                                         ntohs(np->rip6_tag) & 0xffff);
 713                         }
 714                         trace(2, "\n");
 715                 }
 716         }
 717         error = sendpacket(sin, RIPSIZE(nrt));
 718         if (error == EAFNOSUPPORT) {
 719                 /* Protocol not supported */
 720                 tracet(1, "Could not send info to %s (%s): "
 721                         "set IFF_UP to 0\n",
 722                         ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
 723                 ifcp->ifc_flags &= ~IFF_UP;     /* As if down for AF_INET6 */
 724         }
 725         nrt = 0; np = ripbuf->rip6_nets;
 726 }
 727
 728 /*
 729  * Generate RIP6_RESPONSE packets and send them.
 730  */
 731 void
 732 ripsend(ifcp, sin, flag)
 733         struct  ifc *ifcp;
 734         struct  sockaddr_in6 *sin;
 735         int flag;
 736 {
 737         struct  riprt *rrt;
 738         struct  in6_addr *nh;   /* next hop */
 739         int     maxrte;
 740
 741         if (ifcp == NULL) {
 742                 /*
 743                  * Request from non-link local address is not
 744                  * a regular route6d update.
 745                  */
 746                 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) -
 747                                 sizeof(struct udphdr) -
 748                                 sizeof(struct rip6) + sizeof(struct netinfo6)) /
 749                                 sizeof(struct netinfo6);
 750                 nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
 751                 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
 752                         if (rrt->rrt_rflags & RRTF_NOADVERTISE)
 753                                 continue;
 754                         /* Put the route to the buffer */
 755                         *np = rrt->rrt_info;
 756                         np++; nrt++;
 757                         if (nrt == maxrte) {
 758                                 ripflush(NULL, sin);
 759                                 nh = NULL;
 760                         }
 761                 }
 762                 if (nrt)        /* Send last packet */
 763                         ripflush(NULL, sin);
 764                 return;
 765         }
 766
 767         if ((flag & RRTF_SENDANYWAY) == 0 &&
 768             (qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
 769                 return;
 770
 771         /* -N: no use */
 772         if (iff_find(ifcp, 'N') != NULL)
 773                 return;
 774
 775         /* -T: generate default route only */
 776         if (iff_find(ifcp, 'T') != NULL) {
 777                 struct netinfo6 rrt_info;
 778                 memset(&rrt_info, 0, sizeof(struct netinfo6));
 779                 rrt_info.rip6_dest = in6addr_any;
 780                 rrt_info.rip6_plen = 0;
 781                 rrt_info.rip6_metric = 1;
 782                 rrt_info.rip6_metric += ifcp->ifc_metric;
 783                 rrt_info.rip6_tag = htons(routetag & 0xffff);
 784                 np = ripbuf->rip6_nets;
 785                 *np = rrt_info;
 786                 nrt = 1;
 787                 ripflush(ifcp, sin);
 788                 return;
 789         }
 790
 791         maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) -
 792                         sizeof(struct udphdr) -
 793                         sizeof(struct rip6) + sizeof(struct netinfo6)) /
 794                         sizeof(struct netinfo6);
 795
 796         nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
 797         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
 798                 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
 799                         continue;
 800
 801                 /* Need to check filter here */
 802                 if (out_filter(rrt, ifcp) == 0)
 803                         continue;
 804
 805                 /* Check split horizon and other conditions */
 806                 if (tobeadv(rrt, ifcp) == 0)
 807                         continue;
 808
 809                 /* Only considers the routes with flag if specified */
 810                 if ((flag & RRTF_CHANGED) &&
 811                     (rrt->rrt_rflags & RRTF_CHANGED) == 0)
 812                         continue;
 813
 814                 /* Check nexthop */
 815                 if (rrt->rrt_index == ifcp->ifc_index &&
 816                     !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) &&
 817                     (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) {
 818                         if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) {
 819                                 if (nrt == maxrte - 2)
 820                                         ripflush(ifcp, sin);
 821                                 np->rip6_dest = rrt->rrt_gw;
 822                                 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest))
 823                                         SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0);
 824                                 np->rip6_plen = 0;
 825                                 np->rip6_tag = 0;
 826                                 np->rip6_metric = NEXTHOP_METRIC;
 827                                 nh = &rrt->rrt_gw;
 828                                 np++; nrt++;
 829                         }
 830                 } else if (nh && (rrt->rrt_index != ifcp->ifc_index ||
 831                                   !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) ||
 832                                   rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) {
 833                         /* Reset nexthop */
 834                         if (nrt == maxrte - 2)
 835                                 ripflush(ifcp, sin);
 836                         memset(np, 0, sizeof(struct netinfo6));
 837                         np->rip6_metric = NEXTHOP_METRIC;
 838                         nh = NULL;
 839                         np++; nrt++;
 840                 }
 841
 842                 /* Put the route to the buffer */
 843                 *np = rrt->rrt_info;
 844                 np++; nrt++;
 845                 if (nrt == maxrte) {
 846                         ripflush(ifcp, sin);
 847                         nh = NULL;
 848                 }
 849         }
 850         if (nrt)        /* Send last packet */
 851                 ripflush(ifcp, sin);
 852 }
 853
 854 /*
 855  * outbound filter logic, per-route/interface.
 856  */
 857 int
 858 out_filter(rrt, ifcp)
 859         struct riprt *rrt;
 860         struct ifc *ifcp;
 861 {
 862         struct iff *iffp;
 863         struct in6_addr ia;
 864         int ok;
 865
 866         /*
 867          * -A: filter out less specific routes, if we have aggregated
 868          * route configured.
 869          */
 870         for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
 871                 if (iffp->iff_type != 'A')
 872                         continue;
 873                 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen)
 874                         continue;
 875                 ia = rrt->rrt_info.rip6_dest;
 876                 applyplen(&ia, iffp->iff_plen);
 877                 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr))
 878                         return 0;
 879         }
 880
 881         /*
 882          * if it is an aggregated route, advertise it only to the
 883          * interfaces specified on -A.
 884          */
 885         if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) {
 886                 ok = 0;
 887                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
 888                         if (iffp->iff_type != 'A')
 889                                 continue;
 890                         if (rrt->rrt_info.rip6_plen == iffp->iff_plen &&
 891                             IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
 892                             &iffp->iff_addr)) {
 893                                 ok = 1;
 894                                 break;
 895                         }
 896                 }
 897                 if (!ok)
 898                         return 0;
 899         }
 900
 901         /*
 902          * -O: advertise only if prefix matches the configured prefix.
 903          */
 904         if (iff_find(ifcp, 'O')) {
 905                 ok = 0;
 906                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
 907                         if (iffp->iff_type != 'O')
 908                                 continue;
 909                         if (rrt->rrt_info.rip6_plen < iffp->iff_plen)
 910                                 continue;
 911                         ia = rrt->rrt_info.rip6_dest;
 912                         applyplen(&ia, iffp->iff_plen);
 913                         if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
 914                                 ok = 1;
 915                                 break;
 916                         }
 917                 }
 918                 if (!ok)
 919                         return 0;
 920         }
 921
 922         /* the prefix should be advertised */
 923         return 1;
 924 }
 925
 926 /*
 927  * Determine if the route is to be advertised on the specified interface.
 928  * It checks options specified in the arguments and the split horizon rule.
 929  */
 930 int
 931 tobeadv(rrt, ifcp)
 932         struct riprt *rrt;
 933         struct ifc *ifcp;
 934 {
 935
 936         /* Special care for static routes */
 937         if (rrt->rrt_flags & RTF_STATIC) {
 938                 /* XXX don't advertise reject/blackhole routes */
 939                 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE))
 940                         return 0;
 941
 942                 if (Sflag)      /* Yes, advertise it anyway */
 943                         return 1;
 944                 if (sflag && rrt->rrt_index != ifcp->ifc_index)
 945                         return 1;
 946                 return 0;
 947         }
 948         /* Regular split horizon */
 949         if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index)
 950                 return 0;
 951         return 1;
 952 }
 953
 954 /*
 955  * Send a rip packet actually.
 956  */
 957 int
 958 sendpacket(sin, len)
 959         struct  sockaddr_in6 *sin;
 960         int     len;
 961 {
 962         /*
 963          * MSG_DONTROUTE should not be specified when it responds with a
 964          * RIP6_REQUEST message.  SO_DONTROUTE has been specified to
 965          * other sockets.
 966          */
 967         struct msghdr m;
 968         struct cmsghdr *cm;
 969         struct iovec iov[2];
 970         u_char cmsgbuf[256];
 971         struct in6_pktinfo *pi;
 972         int idx;
 973         struct sockaddr_in6 sincopy;
 974
 975         /* do not overwrite the given sin */
 976         sincopy = *sin;
 977         sin = &sincopy;
 978
 979         if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr)
 980          || IN6_IS_ADDR_MULTICAST(&sin->sin6_addr)) {
 981                 idx = IN6_LINKLOCAL_IFINDEX(sin->sin6_addr);
 982                 SET_IN6_LINKLOCAL_IFINDEX(sin->sin6_addr, 0);
 983         } else
 984                 idx = 0;
 985
 986         m.msg_name = (caddr_t)sin;
 987         m.msg_namelen = sizeof(*sin);
 988         iov[0].iov_base = (caddr_t)ripbuf;
 989         iov[0].iov_len = len;
 990         m.msg_iov = iov;
 991         m.msg_iovlen = 1;
 992         if (!idx) {
 993                 m.msg_control = NULL;
 994                 m.msg_controllen = 0;
 995         } else {
 996                 memset(cmsgbuf, 0, sizeof(cmsgbuf));
 997                 cm = (struct cmsghdr *)cmsgbuf;
 998                 m.msg_control = (caddr_t)cm;
 999                 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
1000
1001                 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1002                 cm->cmsg_level = IPPROTO_IPV6;
1003                 cm->cmsg_type = IPV6_PKTINFO;
1004                 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
1005                 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/
1006                 pi->ipi6_ifindex = idx;
1007         }
1008
1009         if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) {
1010                 trace(1, "sendmsg: %s\n", strerror(errno));
1011                 return errno;
1012         }
1013
1014         return 0;
1015 }
1016
1017 /*
1018  * Receive and process RIP packets.  Update the routes/kernel forwarding
1019  * table if necessary.
1020  */
1021 void
1022 riprecv()
1023 {
1024         struct  ifc *ifcp, *ic;
1025         struct  sockaddr_in6 fsock;
1026         struct  in6_addr nh;    /* next hop */
1027         struct  rip6 *rp;
1028         struct  netinfo6 *np, *nq;
1029         struct  riprt *rrt;
1030         int     len, nn, need_trigger, idx;
1031         char    buf[4 * RIP6_MAXMTU];
1032         time_t  t;
1033         struct msghdr m;
1034         struct cmsghdr *cm;
1035         struct iovec iov[2];
1036         u_char cmsgbuf[256];
1037         struct in6_pktinfo *pi;
1038         struct iff *iffp;
1039         struct in6_addr ia;
1040         int ok;
1041         time_t t_half_lifetime;
1042
1043         need_trigger = 0;
1044
1045         m.msg_name = (caddr_t)&fsock;
1046         m.msg_namelen = sizeof(fsock);
1047         iov[0].iov_base = (caddr_t)buf;
1048         iov[0].iov_len = sizeof(buf);
1049         m.msg_iov = iov;
1050         m.msg_iovlen = 1;
1051         cm = (struct cmsghdr *)cmsgbuf;
1052         m.msg_control = (caddr_t)cm;
1053         m.msg_controllen = sizeof(cmsgbuf);
1054         if ((len = recvmsg(ripsock, &m, 0)) < 0) {
1055                 fatal("recvmsg");
1056                 /*NOTREACHED*/
1057         }
1058         idx = 0;
1059         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
1060              cm;
1061              cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
1062                 if (cm->cmsg_level == IPPROTO_IPV6 &&
1063                     cm->cmsg_type == IPV6_PKTINFO) {
1064                         pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
1065                         idx = pi->ipi6_ifindex;
1066                         break;
1067                 }
1068         }
1069         if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr))
1070                 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx);
1071
1072         nh = fsock.sin6_addr;
1073         nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) /
1074                 sizeof(struct netinfo6);
1075         rp = (struct rip6 *)buf;
1076         np = rp->rip6_nets;
1077
1078         if (rp->rip6_vers !=  RIP6_VERSION) {
1079                 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers);
1080                 return;
1081         }
1082         if (rp->rip6_cmd == RIP6_REQUEST) {
1083                 if (idx && idx < nindex2ifc) {
1084                         ifcp = index2ifc[idx];
1085                         riprequest(ifcp, np, nn, &fsock);
1086                 } else {
1087                         riprequest(NULL, np, nn, &fsock);
1088                 }
1089                 return;
1090         }
1091
1092         if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) {
1093                 trace(1, "Packets from non-ll addr: %s\n",
1094                     inet6_n2p(&fsock.sin6_addr));
1095                 return;         /* Ignore packets from non-link-local addr */
1096         }
1097         idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr);
1098         ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL;
1099         if (!ifcp) {
1100                 trace(1, "Packets to unknown interface index %d\n", idx);
1101                 return;         /* Ignore it */
1102         }
1103         if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr))
1104                 return;         /* The packet is from me; ignore */
1105         if (rp->rip6_cmd != RIP6_RESPONSE) {
1106                 trace(1, "Invalid command %d\n", rp->rip6_cmd);
1107                 return;
1108         }
1109
1110         /* -N: no use */
1111         if (iff_find(ifcp, 'N') != NULL)
1112                 return;
1113
1114         tracet(1, "Recv(%s): from %s.%d info(%d)\n",
1115             ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn);
1116
1117         t = time(NULL);
1118         t_half_lifetime = t - (RIP_LIFETIME/2);
1119         for (; nn; nn--, np++) {
1120                 if (np->rip6_metric == NEXTHOP_METRIC) {
1121                         /* modify neighbor address */
1122                         if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1123                                 nh = np->rip6_dest;
1124                                 SET_IN6_LINKLOCAL_IFINDEX(nh, idx);
1125                                 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1126                         } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) {
1127                                 nh = fsock.sin6_addr;
1128                                 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1129                         } else {
1130                                 nh = fsock.sin6_addr;
1131                                 trace(1, "\tInvalid Nexthop: %s\n",
1132                                     inet6_n2p(&np->rip6_dest));
1133                         }
1134                         continue;
1135                 }
1136                 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) {
1137                         trace(1, "\tMulticast netinfo6: %s/%d [%d]\n",
1138                                 inet6_n2p(&np->rip6_dest),
1139                                 np->rip6_plen, np->rip6_metric);
1140                         continue;
1141                 }
1142                 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) {
1143                         trace(1, "\tLoopback netinfo6: %s/%d [%d]\n",
1144                                 inet6_n2p(&np->rip6_dest),
1145                                 np->rip6_plen, np->rip6_metric);
1146                         continue;
1147                 }
1148                 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1149                         trace(1, "\tLink Local netinfo6: %s/%d [%d]\n",
1150                                 inet6_n2p(&np->rip6_dest),
1151                                 np->rip6_plen, np->rip6_metric);
1152                         continue;
1153                 }
1154                 /* may need to pass sitelocal prefix in some case, however*/
1155                 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) {
1156                         trace(1, "\tSite Local netinfo6: %s/%d [%d]\n",
1157                                 inet6_n2p(&np->rip6_dest),
1158                                 np->rip6_plen, np->rip6_metric);
1159                         continue;
1160                 }
1161                 trace(2, "\tnetinfo6: %s/%d [%d]",
1162                         inet6_n2p(&np->rip6_dest),
1163                         np->rip6_plen, np->rip6_metric);
1164                 if (np->rip6_tag)
1165                         trace(2, "  tag=0x%04x", ntohs(np->rip6_tag) & 0xffff);
1166                 if (dflag >= 2) {
1167                         ia = np->rip6_dest;
1168                         applyplen(&ia, np->rip6_plen);
1169                         if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest))
1170                                 trace(2, " [junk outside prefix]");
1171                 }
1172
1173                 /*
1174                  * -L: listen only if the prefix matches the configuration
1175                  */
1176                 ok = 1;         /* if there's no L filter, it is ok */
1177                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
1178                         if (iffp->iff_type != 'L')
1179                                 continue;
1180                         ok = 0;
1181                         if (np->rip6_plen < iffp->iff_plen)
1182                                 continue;
1183                         /* special rule: ::/0 means default, not "in /0" */
1184                         if (iffp->iff_plen == 0 && np->rip6_plen > 0)
1185                                 continue;
1186                         ia = np->rip6_dest;
1187                         applyplen(&ia, iffp->iff_plen);
1188                         if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
1189                                 ok = 1;
1190                                 break;
1191                         }
1192                 }
1193                 if (!ok) {
1194                         trace(2, "  (filtered)\n");
1195                         continue;
1196                 }
1197
1198                 trace(2, "\n");
1199                 np->rip6_metric++;
1200                 np->rip6_metric += ifcp->ifc_metric;
1201                 if (np->rip6_metric > HOPCNT_INFINITY6)
1202                         np->rip6_metric = HOPCNT_INFINITY6;
1203
1204                 applyplen(&np->rip6_dest, np->rip6_plen);
1205                 if ((rrt = rtsearch(np, NULL)) != NULL) {
1206                         if (rrt->rrt_t == 0)
1207                                 continue;       /* Intf route has priority */
1208                         nq = &rrt->rrt_info;
1209                         if (nq->rip6_metric > np->rip6_metric) {
1210                                 if (rrt->rrt_index == ifcp->ifc_index &&
1211                                     IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1212                                         /* Small metric from the same gateway */
1213                                         nq->rip6_metric = np->rip6_metric;
1214                                 } else {
1215                                         /* Better route found */
1216                                         rrt->rrt_index = ifcp->ifc_index;
1217                                         /* Update routing table */
1218                                         delroute(nq, &rrt->rrt_gw);
1219                                         rrt->rrt_gw = nh;
1220                                         *nq = *np;
1221                                         addroute(rrt, &nh, ifcp);
1222                                 }
1223                                 rrt->rrt_rflags |= RRTF_CHANGED;
1224                                 rrt->rrt_t = t;
1225                                 need_trigger = 1;
1226                         } else if (nq->rip6_metric < np->rip6_metric &&
1227                                    rrt->rrt_index == ifcp->ifc_index &&
1228                                    IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1229                                 /* Got worse route from same gw */
1230                                 nq->rip6_metric = np->rip6_metric;
1231                                 rrt->rrt_t = t;
1232                                 rrt->rrt_rflags |= RRTF_CHANGED;
1233                                 need_trigger = 1;
1234                         } else if (nq->rip6_metric == np->rip6_metric &&
1235                                    np->rip6_metric < HOPCNT_INFINITY6) {
1236                                 if (rrt->rrt_index == ifcp->ifc_index &&
1237                                    IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1238                                         /* same metric, same route from same gw */
1239                                         rrt->rrt_t = t;
1240                                 } else if (rrt->rrt_t < t_half_lifetime) {
1241                                         /* Better route found */
1242                                         rrt->rrt_index = ifcp->ifc_index;
1243                                         /* Update routing table */
1244                                         delroute(nq, &rrt->rrt_gw);
1245                                         rrt->rrt_gw = nh;
1246                                         *nq = *np;
1247                                         addroute(rrt, &nh, ifcp);
1248                                         rrt->rrt_rflags |= RRTF_CHANGED;
1249                                         rrt->rrt_t = t;
1250                                 }
1251                         }
1252                         /*
1253                          * if nq->rip6_metric == HOPCNT_INFINITY6 then
1254                          * do not update age value.  Do nothing.
1255                          */
1256                 } else if (np->rip6_metric < HOPCNT_INFINITY6) {
1257                         /* Got a new valid route */
1258                         if ((rrt = MALLOC(struct riprt)) == NULL) {
1259                                 fatal("malloc: struct riprt");
1260                                 /*NOTREACHED*/
1261                         }
1262                         memset(rrt, 0, sizeof(*rrt));
1263                         nq = &rrt->rrt_info;
1264
1265                         rrt->rrt_same = NULL;
1266                         rrt->rrt_index = ifcp->ifc_index;
1267                         rrt->rrt_flags = RTF_UP|RTF_GATEWAY;
1268                         rrt->rrt_gw = nh;
1269                         *nq = *np;
1270                         applyplen(&nq->rip6_dest, nq->rip6_plen);
1271                         if (nq->rip6_plen == sizeof(struct in6_addr) * 8)
1272                                 rrt->rrt_flags |= RTF_HOST;
1273
1274                         /* Put the route to the list */
1275                         rrt->rrt_next = riprt;
1276                         riprt = rrt;
1277                         /* Update routing table */
1278                         addroute(rrt, &nh, ifcp);
1279                         rrt->rrt_rflags |= RRTF_CHANGED;
1280                         need_trigger = 1;
1281                         rrt->rrt_t = t;
1282                 }
1283         }
1284         /* XXX need to care the interval between triggered updates */
1285         if (need_trigger) {
1286                 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) {
1287                         for (ic = ifc; ic; ic = ic->ifc_next) {
1288                                 if (ifcp->ifc_index == ic->ifc_index)
1289                                         continue;
1290                                 if (ic->ifc_flags & IFF_UP)
1291                                         ripsend(ic, &ic->ifc_ripsin,
1292                                                 RRTF_CHANGED);
1293                         }
1294                 }
1295                 /* Reset the flag */
1296                 for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1297                         rrt->rrt_rflags &= ~RRTF_CHANGED;
1298         }
1299 }
1300
1301 /*
1302  * Send all routes request packet to the specified interface.
1303  */
1304 void
1305 sendrequest(ifcp)
1306         struct ifc *ifcp;
1307 {
1308         struct netinfo6 *np;
1309         int error;
1310
1311         if (ifcp->ifc_flags & IFF_LOOPBACK)
1312                 return;
1313         ripbuf->rip6_cmd = RIP6_REQUEST;
1314         np = ripbuf->rip6_nets;
1315         memset(np, 0, sizeof(struct netinfo6));
1316         np->rip6_metric = HOPCNT_INFINITY6;
1317         tracet(1, "Send rtdump Request to %s (%s)\n",
1318                 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1319         error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
1320         if (error == EAFNOSUPPORT) {
1321                 /* Protocol not supported */
1322                 tracet(1, "Could not send rtdump Request to %s (%s): "
1323                         "set IFF_UP to 0\n",
1324                         ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1325                 ifcp->ifc_flags &= ~IFF_UP;     /* As if down for AF_INET6 */
1326         }
1327         ripbuf->rip6_cmd = RIP6_RESPONSE;
1328 }
1329
1330 /*
1331  * Process a RIP6_REQUEST packet.
1332  */
1333 void
1334 riprequest(ifcp, np, nn, sin)
1335         struct ifc *ifcp;
1336         struct netinfo6 *np;
1337         int nn;
1338         struct sockaddr_in6 *sin;
1339 {
1340         int i;
1341         struct riprt *rrt;
1342
1343         if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) &&
1344               np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) {
1345                 /* Specific response, don't split-horizon */
1346                 trace(1, "\tRIP Request\n");
1347                 for (i = 0; i < nn; i++, np++) {
1348                         rrt = rtsearch(np, NULL);
1349                         if (rrt)
1350                                 np->rip6_metric = rrt->rrt_info.rip6_metric;
1351                         else
1352                                 np->rip6_metric = HOPCNT_INFINITY6;
1353                 }
1354                 (void)sendpacket(sin, RIPSIZE(nn));
1355                 return;
1356         }
1357         /* Whole routing table dump */
1358         trace(1, "\tRIP Request -- whole routing table\n");
1359         ripsend(ifcp, sin, RRTF_SENDANYWAY);
1360 }
1361
1362 /*
1363  * Get information of each interface.
1364  */
1365 void
1366 ifconfig()
1367 {
1368         struct ifaddrs *ifap, *ifa;
1369         struct ifc *ifcp;
1370         struct ipv6_mreq mreq;
1371         int s;
1372
1373         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
1374                 fatal("socket");
1375                 /*NOTREACHED*/
1376         }
1377
1378         if (getifaddrs(&ifap) != 0) {
1379                 fatal("getifaddrs");
1380                 /*NOTREACHED*/
1381         }
1382
1383         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1384                 if (ifa->ifa_addr->sa_family != AF_INET6)
1385                         continue;
1386                 ifcp = ifc_find(ifa->ifa_name);
1387                 /* we are interested in multicast-capable interfaces */
1388                 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
1389                         continue;
1390                 if (!ifcp) {
1391                         /* new interface */
1392                         if ((ifcp = MALLOC(struct ifc)) == NULL) {
1393                                 fatal("malloc: struct ifc");
1394                                 /*NOTREACHED*/
1395                         }
1396                         memset(ifcp, 0, sizeof(*ifcp));
1397                         ifcp->ifc_index = -1;
1398                         ifcp->ifc_next = ifc;
1399                         ifc = ifcp;
1400                         nifc++;
1401                         ifcp->ifc_name = allocopy(ifa->ifa_name);
1402                         ifcp->ifc_addr = 0;
1403                         ifcp->ifc_filter = 0;
1404                         ifcp->ifc_flags = ifa->ifa_flags;
1405                         trace(1, "newif %s <%s>\n", ifcp->ifc_name,
1406                                 ifflags(ifcp->ifc_flags));
1407                         if (!strcmp(ifcp->ifc_name, LOOPBACK_IF))
1408                                 loopifcp = ifcp;
1409                 } else {
1410                         /* update flag, this may be up again */
1411                         if (ifcp->ifc_flags != ifa->ifa_flags) {
1412                                 trace(1, "%s: <%s> -> ", ifcp->ifc_name,
1413                                         ifflags(ifcp->ifc_flags));
1414                                 trace(1, "<%s>\n", ifflags(ifa->ifa_flags));
1415                                 ifcp->ifc_cflags |= IFC_CHANGED;
1416                         }
1417                         ifcp->ifc_flags = ifa->ifa_flags;
1418                 }
1419                 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s);
1420                 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP
1421                  && 0 < ifcp->ifc_index && !ifcp->ifc_joined) {
1422                         mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr;
1423                         mreq.ipv6mr_interface = ifcp->ifc_index;
1424                         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1425                             &mreq, sizeof(mreq)) < 0) {
1426                                 fatal("IPV6_JOIN_GROUP");
1427                                 /*NOTREACHED*/
1428                         }
1429                         trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST);
1430                         ifcp->ifc_joined++;
1431                 }
1432         }
1433         close(s);
1434         freeifaddrs(ifap);
1435 }
1436
1437 void
1438 ifconfig1(name, sa, ifcp, s)
1439         const char *name;
1440         const struct sockaddr *sa;
1441         struct  ifc *ifcp;
1442         int     s;
1443 {
1444         struct  in6_ifreq ifr;
1445         const struct sockaddr_in6 *sin;
1446         struct  ifac *ifa;
1447         int     plen;
1448         char    buf[BUFSIZ];
1449
1450         sin = (const struct sockaddr_in6 *)sa;
1451         ifr.ifr_addr = *sin;
1452         strcpy(ifr.ifr_name, name);
1453         if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) {
1454                 fatal("ioctl: SIOCGIFNETMASK_IN6");
1455                 /*NOTREACHED*/
1456         }
1457         plen = sin6mask2len(&ifr.ifr_addr);
1458         if ((ifa = ifa_match(ifcp, &sin->sin6_addr, plen)) != NULL) {
1459                 /* same interface found */
1460                 /* need check if something changed */
1461                 /* XXX not yet implemented */
1462                 return;
1463         }
1464         /*
1465          * New address is found
1466          */
1467         if ((ifa = MALLOC(struct ifac)) == NULL) {
1468                 fatal("malloc: struct ifac");
1469                 /*NOTREACHED*/
1470         }
1471         memset(ifa, 0, sizeof(*ifa));
1472         ifa->ifa_conf = ifcp;
1473         ifa->ifa_next = ifcp->ifc_addr;
1474         ifcp->ifc_addr = ifa;
1475         ifa->ifa_addr = sin->sin6_addr;
1476         ifa->ifa_plen = plen;
1477         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1478                 ifr.ifr_addr = *sin;
1479                 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) {
1480                         fatal("ioctl: SIOCGIFDSTADDR_IN6");
1481                         /*NOTREACHED*/
1482                 }
1483                 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr;
1484                 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf));
1485                 trace(1, "found address %s/%d -- %s\n",
1486                         inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf);
1487         } else {
1488                 trace(1, "found address %s/%d\n",
1489                         inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen);
1490         }
1491         if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1492                 ifcp->ifc_mylladdr = ifa->ifa_addr;
1493                 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr);
1494                 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len);
1495                 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr,
1496                         ifcp->ifc_index);
1497                 setindex2ifc(ifcp->ifc_index, ifcp);
1498                 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index);
1499                 if (ifcp->ifc_mtu > RIP6_MAXMTU)
1500                         ifcp->ifc_mtu = RIP6_MAXMTU;
1501                 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) {
1502                         fatal("ioctl: SIOCGIFMETRIC");
1503                         /*NOTREACHED*/
1504                 }
1505                 ifcp->ifc_metric = ifr.ifr_metric;
1506                 trace(1, "\tindex: %d, mtu: %d, metric: %d\n",
1507                         ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric);
1508         } else
1509                 ifcp->ifc_cflags |= IFC_CHANGED;
1510 }
1511
1512 /*
1513  * Receive and process routing messages.
1514  * Update interface information as necesssary.
1515  */
1516 void
1517 rtrecv()
1518 {
1519         char buf[BUFSIZ];
1520         char *p, *q;
1521         struct rt_msghdr *rtm;
1522         struct ifa_msghdr *ifam;
1523         struct if_msghdr *ifm;
1524         int len;
1525         struct ifc *ifcp, *ic;
1526         int iface = 0, rtable = 0;
1527         struct sockaddr_in6 *rta[RTAX_MAX];
1528         struct sockaddr_in6 mask;
1529         int i, addrs;
1530         struct riprt *rrt;
1531
1532         if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
1533                 perror("read from rtsock");
1534                 exit(1);
1535         }
1536         if (len < sizeof(*rtm)) {
1537                 trace(1, "short read from rtsock: %d (should be > %lu)\n",
1538                         len, (u_long)sizeof(*rtm));
1539                 return;
1540         }
1541
1542         for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) {
1543                 /* safety against bogus message */
1544                 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) {
1545                         trace(1, "bogus rtmsg: length=%d\n",
1546                                 ((struct rt_msghdr *)p)->rtm_msglen);
1547                         break;
1548                 }
1549                 rtm = NULL;
1550                 ifam = NULL;
1551                 ifm = NULL;
1552                 switch (((struct rt_msghdr *)p)->rtm_type) {
1553                 case RTM_NEWADDR:
1554                 case RTM_DELADDR:
1555                         ifam = (struct ifa_msghdr *)p;
1556                         addrs = ifam->ifam_addrs;
1557                         q = (char *)(ifam + 1);
1558                         break;
1559                 case RTM_IFINFO:
1560                         ifm = (struct if_msghdr *)p;
1561                         addrs = ifm->ifm_addrs;
1562                         q = (char *)(ifm + 1);
1563                         break;
1564                 default:
1565                         rtm = (struct rt_msghdr *)p;
1566                         addrs = rtm->rtm_addrs;
1567                         q = (char *)(rtm + 1);
1568                         if (rtm->rtm_version != RTM_VERSION) {
1569                                 trace(1, "unexpected rtmsg version %d "
1570                                         "(should be %d)\n",
1571                                         rtm->rtm_version, RTM_VERSION);
1572                                 continue;
1573                         }
1574                         if (rtm->rtm_pid == pid) {
1575 #if 0
1576                                 trace(1, "rtmsg looped back to me, ignored\n");
1577 #endif
1578                                 continue;
1579                         }
1580                         break;
1581                 }
1582                 memset(&rta, 0, sizeof(rta));
1583                 for (i = 0; i < RTAX_MAX; i++) {
1584                         if (addrs & (1 << i)) {
1585                                 rta[i] = (struct sockaddr_in6 *)q;
1586                                 q += ROUNDUP(rta[i]->sin6_len);
1587                         }
1588                 }
1589
1590                 trace(1, "rtsock: %s (addrs=%x)\n",
1591                         rttypes((struct rt_msghdr *)p), addrs);
1592                 if (dflag >= 2) {
1593                         for (i = 0;
1594                              i < ((struct rt_msghdr *)p)->rtm_msglen;
1595                              i++) {
1596                                 fprintf(stderr, "%02x ", p[i] & 0xff);
1597                                 if (i % 16 == 15) fprintf(stderr, "\n");
1598                         }
1599                         fprintf(stderr, "\n");
1600                 }
1601
1602                 /*
1603                  * Easy ones first.
1604                  *
1605                  * We may be able to optimize by using ifm->ifm_index or
1606                  * ifam->ifam_index.  For simplicity we don't do that here.
1607                  */
1608                 switch (((struct rt_msghdr *)p)->rtm_type) {
1609                 case RTM_NEWADDR:
1610                 case RTM_IFINFO:
1611                         iface++;
1612                         continue;
1613                 case RTM_ADD:
1614                         rtable++;
1615                         continue;
1616                 case RTM_LOSING:
1617                 case RTM_MISS:
1618                 case RTM_RESOLVE:
1619                 case RTM_GET:
1620                 case RTM_LOCK:
1621                         /* nothing to be done here */
1622                         trace(1, "\tnothing to be done, ignored\n");
1623                         continue;
1624                 }
1625
1626 #if 0
1627                 if (rta[RTAX_DST] == NULL) {
1628                         trace(1, "\tno destination, ignored\n");
1629                         continue;
1630                 }
1631                 if (rta[RTAX_DST]->sin6_family != AF_INET6) {
1632                         trace(1, "\taf mismatch, ignored\n");
1633                         continue;
1634                 }
1635                 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) {
1636                         trace(1, "\tlinklocal destination, ignored\n");
1637                         continue;
1638                 }
1639                 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) {
1640                         trace(1, "\tloopback destination, ignored\n");
1641                         continue;               /* Loopback */
1642                 }
1643                 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) {
1644                         trace(1, "\tmulticast destination, ignored\n");
1645                         continue;
1646                 }
1647 #endif
1648
1649                 /* hard ones */
1650                 switch (((struct rt_msghdr *)p)->rtm_type) {
1651                 case RTM_NEWADDR:
1652                 case RTM_IFINFO:
1653                 case RTM_ADD:
1654                 case RTM_LOSING:
1655                 case RTM_MISS:
1656                 case RTM_RESOLVE:
1657                 case RTM_GET:
1658                 case RTM_LOCK:
1659                         /* should already be handled */
1660                         fatal("rtrecv: never reach here");
1661                         /*NOTREACHED*/
1662                 case RTM_DELETE:
1663                         if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) {
1664                                 trace(1, "\tsome of dst/gw/netamsk are "
1665                                     "unavailable, ignored\n");
1666                                 break;
1667                         }
1668                         if ((rtm->rtm_flags & RTF_HOST) != 0) {
1669                                 mask.sin6_len = sizeof(mask);
1670                                 memset(&mask.sin6_addr, 0xff,
1671                                     sizeof(mask.sin6_addr));
1672                                 rta[RTAX_NETMASK] = &mask;
1673                         } else if (!rta[RTAX_NETMASK]) {
1674                                 trace(1, "\tsome of dst/gw/netamsk are "
1675                                     "unavailable, ignored\n");
1676                                 break;
1677                         }
1678                         if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY],
1679                             rta[RTAX_NETMASK]) == 0) {
1680                                 rtable++;       /*just to be sure*/
1681                         }
1682                         break;
1683                 case RTM_CHANGE:
1684                 case RTM_REDIRECT:
1685                         trace(1, "\tnot supported yet, ignored\n");
1686                         break;
1687                 case RTM_DELADDR:
1688                         if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) {
1689                                 trace(1, "\tno netmask or ifa given, ignored\n");
1690                                 break;
1691                         }
1692                         if (ifam->ifam_index < nindex2ifc)
1693                                 ifcp = index2ifc[ifam->ifam_index];
1694                         else
1695                                 ifcp = NULL;
1696                         if (!ifcp) {
1697                                 trace(1, "\tinvalid ifam_index %d, ignored\n",
1698                                         ifam->ifam_index);
1699                                 break;
1700                         }
1701                         if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK]))
1702                                 iface++;
1703                         break;
1704                 case RTM_OLDADD:
1705                 case RTM_OLDDEL:
1706                         trace(1, "\tnot supported yet, ignored\n");
1707                         break;
1708                 }
1709
1710         }
1711
1712         if (iface) {
1713                 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n");
1714                 ifconfig();
1715                 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
1716                         if (ifcp->ifc_cflags & IFC_CHANGED) {
1717                                 if (ifrt(ifcp, 1)) {
1718                                         for (ic = ifc; ic; ic = ic->ifc_next) {
1719                                                 if (ifcp->ifc_index == ic->ifc_index)
1720                                                         continue;
1721                                                 if (ic->ifc_flags & IFF_UP)
1722                                                         ripsend(ic, &ic->ifc_ripsin,
1723                                                         RRTF_CHANGED);
1724                                         }
1725                                         /* Reset the flag */
1726                                         for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1727                                                 rrt->rrt_rflags &= ~RRTF_CHANGED;
1728                                 }
1729                                 ifcp->ifc_cflags &= ~IFC_CHANGED;
1730                         }
1731         }
1732         if (rtable) {
1733                 trace(1, "rtsock: read routing table again\n");
1734                 krtread(1);
1735         }
1736 }
1737
1738 /*
1739  * remove specified route from the internal routing table.
1740  */
1741 int
1742 rt_del(sdst, sgw, smask)
1743         const struct sockaddr_in6 *sdst;
1744         const struct sockaddr_in6 *sgw;
1745         const struct sockaddr_in6 *smask;
1746 {
1747         const struct in6_addr *dst = NULL;
1748         const struct in6_addr *gw = NULL;
1749         int prefix;
1750         struct netinfo6 ni6;
1751         struct riprt *rrt = NULL;
1752         time_t t_lifetime;
1753
1754         if (sdst->sin6_family != AF_INET6) {
1755                 trace(1, "\tother AF, ignored\n");
1756                 return -1;
1757         }
1758         if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr)
1759          || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback)
1760          || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) {
1761                 trace(1, "\taddress %s not interesting, ignored\n",
1762                         inet6_n2p(&sdst->sin6_addr));
1763                 return -1;
1764         }
1765         dst = &sdst->sin6_addr;
1766         if (sgw->sin6_family == AF_INET6) {
1767                 /* easy case */
1768                 gw = &sgw->sin6_addr;
1769                 prefix = sin6mask2len(smask);
1770         } else if (sgw->sin6_family == AF_LINK) {
1771                 /*
1772                  * Interface route... a hard case.  We need to get the prefix
1773                  * length from the kernel, but we now are parsing rtmsg.
1774                  * We'll purge matching routes from my list, then get the
1775                  * fresh list.
1776                  */
1777                 struct riprt *longest;
1778                 trace(1, "\t%s is a interface route, guessing prefixlen\n",
1779                         inet6_n2p(dst));
1780                 longest = NULL;
1781                 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
1782                         if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
1783                                         &sdst->sin6_addr)
1784                          && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
1785                                 if (!longest
1786                                  || longest->rrt_info.rip6_plen <
1787                                                  rrt->rrt_info.rip6_plen) {
1788                                         longest = rrt;
1789                                 }
1790                         }
1791                 }
1792                 rrt = longest;
1793                 if (!rrt) {
1794                         trace(1, "\tno matching interface route found\n");
1795                         return -1;
1796                 }
1797                 gw = &in6addr_loopback;
1798                 prefix = rrt->rrt_info.rip6_plen;
1799         } else {
1800                 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family);
1801                 return -1;
1802         }
1803
1804         trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix);
1805         trace(1, "gw %s\n", inet6_n2p(gw));
1806         t_lifetime = time(NULL) - RIP_LIFETIME;
1807         /* age route for interface address */
1808         memset(&ni6, 0, sizeof(ni6));
1809         ni6.rip6_dest = *dst;
1810         ni6.rip6_plen = prefix;
1811         applyplen(&ni6.rip6_dest, ni6.rip6_plen);       /*to be sure*/
1812         trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest),
1813                 ni6.rip6_plen);
1814         if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) {
1815                 trace(1, "\tno route found\n");
1816                 return -1;
1817         }
1818 #if 0
1819         if ((rrt->rrt_flags & RTF_STATIC) == 0) {
1820                 trace(1, "\tyou can delete static routes only\n");
1821         } else
1822 #endif
1823         if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) {
1824                 trace(1, "\tgw mismatch: %s <-> ",
1825                         inet6_n2p(&rrt->rrt_gw));
1826                 trace(1, "%s\n", inet6_n2p(gw));
1827         } else {
1828                 trace(1, "\troute found, age it\n");
1829                 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1830                         rrt->rrt_t = t_lifetime;
1831                         rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1832                 }
1833         }
1834         return 0;
1835 }
1836
1837 /*
1838  * remove specified address from internal interface/routing table.
1839  */
1840 int
1841 rt_deladdr(ifcp, sifa, smask)
1842         struct ifc *ifcp;
1843         const struct sockaddr_in6 *sifa;
1844         const struct sockaddr_in6 *smask;
1845 {
1846         const struct in6_addr *addr = NULL;
1847         int prefix;
1848         struct ifac *ifa = NULL;
1849         struct netinfo6 ni6;
1850         struct riprt *rrt = NULL;
1851         time_t t_lifetime;
1852         int updated = 0;
1853
1854         if (sifa->sin6_family != AF_INET6) {
1855                 trace(1, "\tother AF, ignored\n");
1856                 return -1;
1857         }
1858         addr = &sifa->sin6_addr;
1859         prefix = sin6mask2len(smask);
1860
1861         trace(1, "\tdeleting %s/%d from %s\n",
1862                 inet6_n2p(addr), prefix, ifcp->ifc_name);
1863         ifa = ifa_match(ifcp, addr, prefix);
1864         if (!ifa) {
1865                 trace(1, "\tno matching ifa found for %s/%d on %s\n",
1866                         inet6_n2p(addr), prefix, ifcp->ifc_name);
1867                 return -1;
1868         }
1869         if (ifa->ifa_conf != ifcp) {
1870                 trace(1, "\taddress table corrupt: back pointer does not match "
1871                         "(%s != %s)\n",
1872                         ifcp->ifc_name, ifa->ifa_conf->ifc_name);
1873                 return -1;
1874         }
1875         /* remove ifa from interface */
1876         if (ifcp->ifc_addr == ifa)
1877                 ifcp->ifc_addr = ifa->ifa_next;
1878         else {
1879                 struct ifac *p;
1880                 for (p = ifcp->ifc_addr; p; p = p->ifa_next) {
1881                         if (p->ifa_next == ifa) {
1882                                 p->ifa_next = ifa->ifa_next;
1883                                 break;
1884                         }
1885                 }
1886         }
1887         ifa->ifa_next = NULL;
1888         ifa->ifa_conf = NULL;
1889         t_lifetime = time(NULL) - RIP_LIFETIME;
1890         /* age route for interface address */
1891         memset(&ni6, 0, sizeof(ni6));
1892         ni6.rip6_dest = ifa->ifa_addr;
1893         ni6.rip6_plen = ifa->ifa_plen;
1894         applyplen(&ni6.rip6_dest, ni6.rip6_plen);
1895         trace(1, "\tfind interface route %s/%d on %d\n",
1896                 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index);
1897         if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1898                 struct in6_addr none;
1899                 memset(&none, 0, sizeof(none));
1900                 if (rrt->rrt_index == ifcp->ifc_index &&
1901                     (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) ||
1902                      IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) {
1903                         trace(1, "\troute found, age it\n");
1904                         if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1905                                 rrt->rrt_t = t_lifetime;
1906                                 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1907                         }
1908                         updated++;
1909                 } else {
1910                         trace(1, "\tnon-interface route found: %s/%d on %d\n",
1911                                 inet6_n2p(&rrt->rrt_info.rip6_dest),
1912                                 rrt->rrt_info.rip6_plen,
1913                                 rrt->rrt_index);
1914                 }
1915         } else
1916                 trace(1, "\tno interface route found\n");
1917         /* age route for p2p destination */
1918         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1919                 memset(&ni6, 0, sizeof(ni6));
1920                 ni6.rip6_dest = ifa->ifa_raddr;
1921                 ni6.rip6_plen = 128;
1922                 applyplen(&ni6.rip6_dest, ni6.rip6_plen);       /*to be sure*/
1923                 trace(1, "\tfind p2p route %s/%d on %d\n",
1924                         inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen,
1925                         ifcp->ifc_index);
1926                 if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1927                         if (rrt->rrt_index == ifcp->ifc_index &&
1928                             IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) {
1929                                 trace(1, "\troute found, age it\n");
1930                                 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1931                                         rrt->rrt_t = t_lifetime;
1932                                         rrt->rrt_info.rip6_metric =
1933                                             HOPCNT_INFINITY6;
1934                                         updated++;
1935                                 }
1936                         } else {
1937                                 trace(1, "\tnon-p2p route found: %s/%d on %d\n",
1938                                         inet6_n2p(&rrt->rrt_info.rip6_dest),
1939                                         rrt->rrt_info.rip6_plen,
1940                                         rrt->rrt_index);
1941                         }
1942                 } else
1943                         trace(1, "\tno p2p route found\n");
1944         }
1945         return updated ? 0 : -1;
1946 }
1947
1948 /*
1949  * Get each interface address and put those interface routes to the route
1950  * list.
1951  */
1952 int
1953 ifrt(ifcp, again)
1954         struct ifc *ifcp;
1955         int again;
1956 {
1957         struct ifac *ifa;
1958         struct riprt *rrt, *search_rrt, *prev_rrt, *loop_rrt;
1959         struct netinfo6 *np;
1960         time_t t_lifetime;
1961         int need_trigger = 0;
1962
1963         if (ifcp->ifc_flags & IFF_LOOPBACK)
1964                 return 0;                       /* ignore loopback */
1965         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1966                 ifrt_p2p(ifcp, again);
1967                 return 0;
1968         }
1969
1970         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
1971                 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1972 #if 0
1973                         trace(1, "route: %s on %s: "
1974                             "skip linklocal interface address\n",
1975                             inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name);
1976 #endif
1977                         continue;
1978                 }
1979                 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) {
1980 #if 0
1981                         trace(1, "route: %s: skip unspec interface address\n",
1982                             ifcp->ifc_name);
1983 #endif
1984                         continue;
1985                 }
1986                 if (ifcp->ifc_flags & IFF_UP) {
1987                         if ((rrt = MALLOC(struct riprt)) == NULL)
1988                                 fatal("malloc: struct riprt");
1989                         memset(rrt, 0, sizeof(*rrt));
1990                         rrt->rrt_same = NULL;
1991                         rrt->rrt_index = ifcp->ifc_index;
1992                         rrt->rrt_t = 0; /* don't age */
1993                         rrt->rrt_info.rip6_dest = ifa->ifa_addr;
1994                         rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
1995                         rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
1996                         rrt->rrt_info.rip6_plen = ifa->ifa_plen;
1997                         rrt->rrt_flags = RTF_CLONING;
1998                         rrt->rrt_rflags |= RRTF_CHANGED;
1999                         applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen);
2000                         memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2001 #if 0
2002                         /* XXX why gateway address == network adddress? */
2003                         rrt->rrt_gw = ifa->ifa_addr;
2004 #endif
2005                         np = &rrt->rrt_info;
2006                         search_rrt = rtsearch(np, &prev_rrt);
2007                         if (search_rrt != NULL) {
2008                                 if (search_rrt->rrt_info.rip6_metric >
2009                                     rrt->rrt_info.rip6_metric) {
2010                                         if (prev_rrt)
2011                                                 prev_rrt->rrt_next = rrt->rrt_next;
2012                                         else
2013                                                 riprt = rrt->rrt_next;
2014                                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
2015                                         free(rrt);
2016                                 } else {
2017                                         /* Already have better route */
2018                                         if (!again) {
2019                                                 trace(1, "route: %s/%d: "
2020                                                     "already registered (%s)\n",
2021                                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2022                                                     ifcp->ifc_name);
2023                                         }
2024                                         free(rrt);
2025                                         continue;
2026                                 }
2027                         }
2028                         /* Attach the route to the list */
2029                         trace(1, "route: %s/%d: register route (%s)\n",
2030                             inet6_n2p(&np->rip6_dest), np->rip6_plen,
2031                             ifcp->ifc_name);
2032                         rrt->rrt_next = riprt;
2033                         riprt = rrt;
2034                         addroute(rrt, &rrt->rrt_gw, ifcp);
2035                         sendrequest(ifcp);
2036                         ripsend(ifcp, &ifcp->ifc_ripsin, 0);
2037                         need_trigger = 1;
2038                 } else {
2039                         for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) {
2040                                 if (loop_rrt->rrt_index == ifcp->ifc_index) {
2041                                         t_lifetime = time(NULL) - RIP_LIFETIME;
2042                                         if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) {
2043                                                 loop_rrt->rrt_t = t_lifetime;
2044                                                 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
2045                                                 loop_rrt->rrt_rflags |= RRTF_CHANGED;
2046                                                 need_trigger = 1;
2047                                         }
2048                                 }
2049                         }
2050                 }
2051         }
2052         return need_trigger;
2053 }
2054
2055 /*
2056  * there are couple of p2p interface routing models.  "behavior" lets
2057  * you pick one.  it looks that gated behavior fits best with BSDs,
2058  * since BSD kernels does not look at prefix length on p2p interfaces.
2059  */
2060 void
2061 ifrt_p2p(ifcp, again)
2062         struct ifc *ifcp;
2063         int again;
2064 {
2065         struct ifac *ifa;
2066         struct riprt *rrt, *orrt, *prevrrt;
2067         struct netinfo6 *np;
2068         struct in6_addr addr, dest;
2069         int advert, ignore, i;
2070 #define P2PADVERT_NETWORK       1
2071 #define P2PADVERT_ADDR          2
2072 #define P2PADVERT_DEST          4
2073 #define P2PADVERT_MAX           4
2074         const enum { CISCO, GATED, ROUTE6D } behavior = GATED;
2075         const char *category = "";
2076         const char *noadv;
2077
2078         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2079                 addr = ifa->ifa_addr;
2080                 dest = ifa->ifa_raddr;
2081                 applyplen(&addr, ifa->ifa_plen);
2082                 applyplen(&dest, ifa->ifa_plen);
2083                 advert = ignore = 0;
2084                 switch (behavior) {
2085                 case CISCO:
2086                         /*
2087                          * honor addr/plen, just like normal shared medium
2088                          * interface.  this may cause trouble if you reuse
2089                          * addr/plen on other interfaces.
2090                          *
2091                          * advertise addr/plen.
2092                          */
2093                         advert |= P2PADVERT_NETWORK;
2094                         break;
2095                 case GATED:
2096                         /*
2097                          * prefixlen on p2p interface is meaningless.
2098                          * advertise addr/128 and dest/128.
2099                          *
2100                          * do not install network route to route6d routing
2101                          * table (if we do, it would prevent route installation
2102                          * for other p2p interface that shares addr/plen).
2103                          *
2104                          * XXX what should we do if dest is ::?  it will not
2105                          * get announced anyways (see following filter),
2106                          * but we need to think.
2107                          */
2108                         advert |= P2PADVERT_ADDR;
2109                         advert |= P2PADVERT_DEST;
2110                         ignore |= P2PADVERT_NETWORK;
2111                         break;
2112                 case ROUTE6D:
2113                         /*
2114                          * just for testing.  actually the code is redundant
2115                          * given the current p2p interface address assignment
2116                          * rule for kame kernel.
2117                          *
2118                          * intent:
2119                          *      A/n -> announce A/n
2120                          *      A B/n, A and B share prefix -> A/n (= B/n)
2121                          *      A B/n, do not share prefix -> A/128 and B/128
2122                          * actually, A/64 and A B/128 are the only cases
2123                          * permitted by the kernel:
2124                          *      A/64 -> A/64
2125                          *      A B/128 -> A/128 and B/128
2126                          */
2127                         if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) {
2128                                 if (IN6_ARE_ADDR_EQUAL(&addr, &dest))
2129                                         advert |= P2PADVERT_NETWORK;
2130                                 else {
2131                                         advert |= P2PADVERT_ADDR;
2132                                         advert |= P2PADVERT_DEST;
2133                                         ignore |= P2PADVERT_NETWORK;
2134                                 }
2135                         } else
2136                                 advert |= P2PADVERT_NETWORK;
2137                         break;
2138                 }
2139
2140                 for (i = 1; i <= P2PADVERT_MAX; i *= 2) {
2141                         if ((ignore & i) != 0)
2142                                 continue;
2143                         if ((rrt = MALLOC(struct riprt)) == NULL) {
2144                                 fatal("malloc: struct riprt");
2145                                 /*NOTREACHED*/
2146                         }
2147                         memset(rrt, 0, sizeof(*rrt));
2148                         rrt->rrt_same = NULL;
2149                         rrt->rrt_index = ifcp->ifc_index;
2150                         rrt->rrt_t = 0; /* don't age */
2151                         switch (i) {
2152                         case P2PADVERT_NETWORK:
2153                                 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2154                                 rrt->rrt_info.rip6_plen = ifa->ifa_plen;
2155                                 applyplen(&rrt->rrt_info.rip6_dest,
2156                                     ifa->ifa_plen);
2157                                 category = "network";
2158                                 break;
2159                         case P2PADVERT_ADDR:
2160                                 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2161                                 rrt->rrt_info.rip6_plen = 128;
2162                                 rrt->rrt_gw = in6addr_loopback;
2163                                 category = "addr";
2164                                 break;
2165                         case P2PADVERT_DEST:
2166                                 rrt->rrt_info.rip6_dest = ifa->ifa_raddr;
2167                                 rrt->rrt_info.rip6_plen = 128;
2168                                 rrt->rrt_gw = ifa->ifa_addr;
2169                                 category = "dest";
2170                                 break;
2171                         }
2172                         if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) ||
2173                             IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) {
2174 #if 0
2175                                 trace(1, "route: %s: skip unspec/linklocal "
2176                                     "(%s on %s)\n", category, ifcp->ifc_name);
2177 #endif
2178                                 free(rrt);
2179                                 continue;
2180                         }
2181                         if ((advert & i) == 0) {
2182                                 rrt->rrt_rflags |= RRTF_NOADVERTISE;
2183                                 noadv = ", NO-ADV";
2184                         } else
2185                                 noadv = "";
2186                         rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2187                         rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
2188                         np = &rrt->rrt_info;
2189                         orrt = rtsearch(np, &prevrrt);
2190                         if (!orrt) {
2191                                 /* Attach the route to the list */
2192                                 trace(1, "route: %s/%d: register route "
2193                                     "(%s on %s%s)\n",
2194                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2195                                     category, ifcp->ifc_name, noadv);
2196                                 rrt->rrt_next = riprt;
2197                                 riprt = rrt;
2198                         } else if (rrt->rrt_index != orrt->rrt_index ||
2199                             rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) {
2200                                 /* swap route */
2201                                 rrt->rrt_next = orrt->rrt_next;
2202                                 if (prevrrt)
2203                                         prevrrt->rrt_next = rrt;
2204                                 else
2205                                         riprt = rrt;
2206                                 free(orrt);
2207
2208                                 trace(1, "route: %s/%d: update (%s on %s%s)\n",
2209                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2210                                     category, ifcp->ifc_name, noadv);
2211                         } else {
2212                                 /* Already found */
2213                                 if (!again) {
2214                                         trace(1, "route: %s/%d: "
2215                                             "already registered (%s on %s%s)\n",
2216                                             inet6_n2p(&np->rip6_dest),
2217                                             np->rip6_plen, category,
2218                                             ifcp->ifc_name, noadv);
2219                                 }
2220                                 free(rrt);
2221                         }
2222                 }
2223         }
2224 #undef P2PADVERT_NETWORK
2225 #undef P2PADVERT_ADDR
2226 #undef P2PADVERT_DEST
2227 #undef P2PADVERT_MAX
2228 }
2229
2230 int
2231 getifmtu(ifindex)
2232         int     ifindex;
2233 {
2234         int     mib[6];
2235         char    *buf;
2236         size_t  msize;
2237         struct  if_msghdr *ifm;
2238         int     mtu;
2239
2240         mib[0] = CTL_NET;
2241         mib[1] = PF_ROUTE;
2242         mib[2] = 0;
2243         mib[3] = AF_INET6;
2244         mib[4] = NET_RT_IFLIST;
2245         mib[5] = ifindex;
2246         if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2247                 fatal("sysctl estimate NET_RT_IFLIST");
2248                 /*NOTREACHED*/
2249         }
2250         if ((buf = malloc(msize)) == NULL) {
2251                 fatal("malloc");
2252                 /*NOTREACHED*/
2253         }
2254         if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2255                 fatal("sysctl NET_RT_IFLIST");
2256                 /*NOTREACHED*/
2257         }
2258         ifm = (struct if_msghdr *)buf;
2259         mtu = ifm->ifm_data.ifi_mtu;
2260 #ifdef __DragonFly__
2261         if (ifindex != ifm->ifm_index) {
2262                 fatal("ifindex does not match with ifm_index");
2263                 /*NOTREACHED*/
2264         }
2265 #endif
2266         free(buf);
2267         return mtu;
2268 }
2269
2270 const char *
2271 rttypes(rtm)
2272         struct rt_msghdr *rtm;
2273 {
2274 #define RTTYPE(s, f) \
2275 do { \
2276         if (rtm->rtm_type == (f)) \
2277                 return (s); \
2278 } while (0)
2279         RTTYPE("ADD", RTM_ADD);
2280         RTTYPE("DELETE", RTM_DELETE);
2281         RTTYPE("CHANGE", RTM_CHANGE);
2282         RTTYPE("GET", RTM_GET);
2283         RTTYPE("LOSING", RTM_LOSING);
2284         RTTYPE("REDIRECT", RTM_REDIRECT);
2285         RTTYPE("MISS", RTM_MISS);
2286         RTTYPE("LOCK", RTM_LOCK);
2287         RTTYPE("OLDADD", RTM_OLDADD);
2288         RTTYPE("OLDDEL", RTM_OLDDEL);
2289         RTTYPE("RESOLVE", RTM_RESOLVE);
2290         RTTYPE("NEWADDR", RTM_NEWADDR);
2291         RTTYPE("DELADDR", RTM_DELADDR);
2292         RTTYPE("IFINFO", RTM_IFINFO);
2293 #ifdef RTM_OLDADD
2294         RTTYPE("OLDADD", RTM_OLDADD);
2295 #endif
2296 #ifdef RTM_OLDDEL
2297         RTTYPE("OLDDEL", RTM_OLDDEL);
2298 #endif
2299 #ifdef RTM_OIFINFO
2300         RTTYPE("OIFINFO", RTM_OIFINFO);
2301 #endif
2302 #ifdef RTM_IFANNOUNCE
2303         RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE);
2304 #endif
2305 #ifdef RTM_NEWMADDR
2306         RTTYPE("NEWMADDR", RTM_NEWMADDR);
2307 #endif
2308 #ifdef RTM_DELMADDR
2309         RTTYPE("DELMADDR", RTM_DELMADDR);
2310 #endif
2311 #undef RTTYPE
2312         return NULL;
2313 }
2314
2315 const char *
2316 rtflags(rtm)
2317         struct rt_msghdr *rtm;
2318 {
2319         static char buf[BUFSIZ];
2320
2321         /*
2322          * letter conflict should be okay.  painful when *BSD diverges...
2323          */
2324         strlcpy(buf, "", sizeof(buf));
2325 #define RTFLAG(s, f) \
2326 do { \
2327         if (rtm->rtm_flags & (f)) \
2328                 strlcat(buf, (s), sizeof(buf)); \
2329 } while (0)
2330         RTFLAG("U", RTF_UP);
2331         RTFLAG("G", RTF_GATEWAY);
2332         RTFLAG("H", RTF_HOST);
2333         RTFLAG("R", RTF_REJECT);
2334         RTFLAG("D", RTF_DYNAMIC);
2335         RTFLAG("M", RTF_MODIFIED);
2336         RTFLAG("d", RTF_DONE);
2337 #ifdef  RTF_MASK
2338         RTFLAG("m", RTF_MASK);
2339 #endif
2340         RTFLAG("C", RTF_CLONING);
2341 #ifdef RTF_CLONED
2342         RTFLAG("c", RTF_CLONED);
2343 #endif
2344 #ifdef RTF_PRCLONING
2345         RTFLAG("c", RTF_PRCLONING);
2346 #endif
2347 #ifdef RTF_WASCLONED
2348         RTFLAG("W", RTF_WASCLONED);
2349 #endif
2350         RTFLAG("X", RTF_XRESOLVE);
2351         RTFLAG("L", RTF_LLINFO);
2352         RTFLAG("S", RTF_STATIC);
2353         RTFLAG("B", RTF_BLACKHOLE);
2354 #ifdef RTF_PROTO3
2355         RTFLAG("3", RTF_PROTO3);
2356 #endif
2357         RTFLAG("2", RTF_PROTO2);
2358         RTFLAG("1", RTF_PROTO1);
2359 #ifdef RTF_BROADCAST
2360         RTFLAG("b", RTF_BROADCAST);
2361 #endif
2362 #ifdef RTF_DEFAULT
2363         RTFLAG("d", RTF_DEFAULT);
2364 #endif
2365 #ifdef RTF_ISAROUTER
2366         RTFLAG("r", RTF_ISAROUTER);
2367 #endif
2368 #ifdef RTF_TUNNEL
2369         RTFLAG("T", RTF_TUNNEL);
2370 #endif
2371 #ifdef RTF_AUTH
2372         RTFLAG("A", RTF_AUTH);
2373 #endif
2374 #ifdef RTF_CRYPT
2375         RTFLAG("E", RTF_CRYPT);
2376 #endif
2377 #undef RTFLAG
2378         return buf;
2379 }
2380
2381 const char *
2382 ifflags(flags)
2383         int flags;
2384 {
2385         static char buf[BUFSIZ];
2386
2387         strlcpy(buf, "", sizeof(buf));
2388 #define IFFLAG(s, f) \
2389 do { \
2390         if (flags & f) { \
2391                 if (buf[0]) \
2392                         strlcat(buf, ",", sizeof(buf)); \
2393                 strlcat(buf, s, sizeof(buf)); \
2394         } \
2395 } while (0)
2396         IFFLAG("UP", IFF_UP);
2397         IFFLAG("BROADCAST", IFF_BROADCAST);
2398         IFFLAG("DEBUG", IFF_DEBUG);
2399         IFFLAG("LOOPBACK", IFF_LOOPBACK);
2400         IFFLAG("POINTOPOINT", IFF_POINTOPOINT);
2401 #ifdef IFF_NOTRAILERS
2402         IFFLAG("NOTRAILERS", IFF_NOTRAILERS);
2403 #endif
2404 #ifdef IFF_SMART
2405         IFFLAG("SMART", IFF_SMART);
2406 #endif
2407         IFFLAG("RUNNING", IFF_RUNNING);
2408         IFFLAG("NOARP", IFF_NOARP);
2409         IFFLAG("PROMISC", IFF_PROMISC);
2410         IFFLAG("ALLMULTI", IFF_ALLMULTI);
2411         IFFLAG("OACTIVE", IFF_OACTIVE);
2412         IFFLAG("SIMPLEX", IFF_SIMPLEX);
2413         IFFLAG("LINK0", IFF_LINK0);
2414         IFFLAG("LINK1", IFF_LINK1);
2415         IFFLAG("LINK2", IFF_LINK2);
2416         IFFLAG("MULTICAST", IFF_MULTICAST);
2417 #undef IFFLAG
2418         return buf;
2419 }
2420
2421 void
2422 krtread(again)
2423         int again;
2424 {
2425         int mib[6];
2426         size_t msize;
2427         char *buf, *p, *lim;
2428         struct rt_msghdr *rtm;
2429         int retry;
2430         const char *errmsg;
2431
2432         retry = 0;
2433         buf = NULL;
2434         mib[0] = CTL_NET;
2435         mib[1] = PF_ROUTE;
2436         mib[2] = 0;
2437         mib[3] = AF_INET6;      /* Address family */
2438         mib[4] = NET_RT_DUMP;   /* Dump the kernel routing table */
2439         mib[5] = 0;             /* No flags */
2440         do {
2441                 retry++;
2442                 errmsg = NULL;
2443                 if (buf)
2444                         free(buf);
2445                 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2446                         errmsg = "sysctl estimate";
2447                         continue;
2448                 }
2449                 if ((buf = malloc(msize)) == NULL) {
2450                         errmsg = "malloc";
2451                         continue;
2452                 }
2453                 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2454                         errmsg = "sysctl NET_RT_DUMP";
2455                         continue;
2456                 }
2457         } while (retry < 5 && errmsg != NULL);
2458         if (errmsg) {
2459                 fatal("%s (with %d retries, msize=%lu)", errmsg, retry,
2460                     (u_long)msize);
2461                 /*NOTREACHED*/
2462         } else if (1 < retry)
2463                 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry);
2464
2465         lim = buf + msize;
2466         for (p = buf; p < lim; p += rtm->rtm_msglen) {
2467                 rtm = (struct rt_msghdr *)p;
2468                 rt_entry(rtm, again);
2469         }
2470         free(buf);
2471 }
2472
2473 void
2474 rt_entry(rtm, again)
2475         struct rt_msghdr *rtm;
2476         int again;
2477 {
2478         struct  sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask;
2479         struct  sockaddr_in6 *sin6_genmask, *sin6_ifp;
2480         char    *rtmp, *ifname = NULL;
2481         struct  riprt *rrt, *orrt;
2482         struct  netinfo6 *np;
2483         int     s;
2484
2485         sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0;
2486         if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags &
2487                 (RTF_CLONING|RTF_XRESOLVE|RTF_LLINFO|RTF_BLACKHOLE)) {
2488                 return;         /* not interested in the link route */
2489         }
2490         /* do not look at cloned routes */
2491 #ifdef RTF_WASCLONED
2492         if (rtm->rtm_flags & RTF_WASCLONED)
2493                 return;
2494 #endif
2495 #ifdef RTF_CLONED
2496         if (rtm->rtm_flags & RTF_CLONED)
2497                 return;
2498 #endif
2499         /*
2500          * do not look at dynamic routes.
2501          * netbsd/openbsd cloned routes have UGHD.
2502          */
2503         if (rtm->rtm_flags & RTF_DYNAMIC)
2504                 return;
2505         rtmp = (char *)(rtm + 1);
2506         /* Destination */
2507         if ((rtm->rtm_addrs & RTA_DST) == 0)
2508                 return;         /* ignore routes without destination address */
2509         sin6_dst = (struct sockaddr_in6 *)rtmp;
2510         rtmp += ROUNDUP(sin6_dst->sin6_len);
2511         if (rtm->rtm_addrs & RTA_GATEWAY) {
2512                 sin6_gw = (struct sockaddr_in6 *)rtmp;
2513                 rtmp += ROUNDUP(sin6_gw->sin6_len);
2514         }
2515         if (rtm->rtm_addrs & RTA_NETMASK) {
2516                 sin6_mask = (struct sockaddr_in6 *)rtmp;
2517                 rtmp += ROUNDUP(sin6_mask->sin6_len);
2518         }
2519         if (rtm->rtm_addrs & RTA_GENMASK) {
2520                 sin6_genmask = (struct sockaddr_in6 *)rtmp;
2521                 rtmp += ROUNDUP(sin6_genmask->sin6_len);
2522         }
2523         if (rtm->rtm_addrs & RTA_IFP) {
2524                 sin6_ifp = (struct sockaddr_in6 *)rtmp;
2525                 rtmp += ROUNDUP(sin6_ifp->sin6_len);
2526         }
2527
2528         /* Destination */
2529         if (sin6_dst->sin6_family != AF_INET6)
2530                 return;
2531         if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr))
2532                 return;         /* Link-local */
2533         if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback))
2534                 return;         /* Loopback */
2535         if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr))
2536                 return;
2537
2538         if ((rrt = MALLOC(struct riprt)) == NULL) {
2539                 fatal("malloc: struct riprt");
2540                 /*NOTREACHED*/
2541         }
2542         memset(rrt, 0, sizeof(*rrt));
2543         np = &rrt->rrt_info;
2544         rrt->rrt_same = NULL;
2545         rrt->rrt_t = time(NULL);
2546         if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC))
2547                 rrt->rrt_t = 0; /* Don't age static routes */
2548 #if 0
2549         np->rip6_tag = htons(routetag & 0xffff);
2550 #else
2551         np->rip6_tag = 0;
2552 #endif
2553         np->rip6_metric = rtm->rtm_rmx.rmx_hopcount;
2554         if (np->rip6_metric < 1)
2555                 np->rip6_metric = 1;
2556         rrt->rrt_flags = rtm->rtm_flags;
2557         np->rip6_dest = sin6_dst->sin6_addr;
2558
2559         /* Mask or plen */
2560         if (rtm->rtm_flags & RTF_HOST)
2561                 np->rip6_plen = 128;    /* Host route */
2562         else if (sin6_mask)
2563                 np->rip6_plen = sin6mask2len(sin6_mask);
2564         else
2565                 np->rip6_plen = 0;
2566
2567         orrt = rtsearch(np, NULL);
2568         if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) {
2569                 /* Already found */
2570                 if (!again) {
2571                         trace(1, "route: %s/%d flags %s: already registered\n",
2572                                 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2573                                 rtflags(rtm));
2574                 }
2575                 free(rrt);
2576                 return;
2577         }
2578         /* Gateway */
2579         if (!sin6_gw)
2580                 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2581         else {
2582                 if (sin6_gw->sin6_family == AF_INET6)
2583                         rrt->rrt_gw = sin6_gw->sin6_addr;
2584                 else if (sin6_gw->sin6_family == AF_LINK) {
2585                         /* XXX in case ppp link? */
2586                         rrt->rrt_gw = in6addr_loopback;
2587                 } else
2588                         memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2589         }
2590         trace(1, "route: %s/%d flags %s",
2591                 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm));
2592         trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw));
2593
2594         /* Interface */
2595         s = rtm->rtm_index;
2596         if (s < nindex2ifc && index2ifc[s])
2597                 ifname = index2ifc[s]->ifc_name;
2598         else {
2599                 trace(1, " not configured\n");
2600                 free(rrt);
2601                 return;
2602         }
2603         trace(1, " if %s sock %d", ifname, s);
2604         rrt->rrt_index = s;
2605
2606         trace(1, "\n");
2607
2608         /* Check gateway */
2609         if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) &&
2610             !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)
2611 #ifdef __DragonFly__
2612          && (rrt->rrt_flags & RTF_LOCAL) == 0
2613 #endif
2614             ) {
2615                 trace(0, "***** Gateway %s is not a link-local address.\n",
2616                         inet6_n2p(&rrt->rrt_gw));
2617                 trace(0, "*****     dest(%s) if(%s) -- Not optimized.\n",
2618                         inet6_n2p(&rrt->rrt_info.rip6_dest), ifname);
2619                 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR;
2620         }
2621
2622         /* Put it to the route list */
2623         if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) {
2624                 /* replace route list */
2625                 rrt->rrt_next = orrt->rrt_next;
2626                 *orrt = *rrt;
2627                 trace(1, "route: %s/%d flags %s: replace new route\n",
2628                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2629                     rtflags(rtm));
2630                 free(rrt);
2631         } else {
2632                 rrt->rrt_next = riprt;
2633                 riprt = rrt;
2634         }
2635 }
2636
2637 int
2638 addroute(rrt, gw, ifcp)
2639         struct riprt *rrt;
2640         const struct in6_addr *gw;
2641         struct ifc *ifcp;
2642 {
2643         struct  netinfo6 *np;
2644         u_char  buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ];
2645         struct  rt_msghdr       *rtm;
2646         struct  sockaddr_in6    *sin;
2647         int     len;
2648
2649         np = &rrt->rrt_info;
2650         inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1));
2651         inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2));
2652         tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n",
2653                 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2654                 np->rip6_metric - 1, buf2);
2655         if (rtlog)
2656                 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(),
2657                         inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2658                         np->rip6_metric - 1, buf2);
2659         if (nflag)
2660                 return 0;
2661
2662         memset(buf, 0, sizeof(buf));
2663         rtm = (struct rt_msghdr *)buf;
2664         rtm->rtm_type = RTM_ADD;
2665         rtm->rtm_version = RTM_VERSION;
2666         rtm->rtm_seq = ++seq;
2667         rtm->rtm_pid = pid;
2668         rtm->rtm_flags = rrt->rrt_flags;
2669         rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2670         rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1;
2671         rtm->rtm_inits = RTV_HOPCOUNT;
2672         sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2673         /* Destination */
2674         sin->sin6_len = sizeof(struct sockaddr_in6);
2675         sin->sin6_family = AF_INET6;
2676         sin->sin6_addr = np->rip6_dest;
2677         sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
2678         /* Gateway */
2679         sin->sin6_len = sizeof(struct sockaddr_in6);
2680         sin->sin6_family = AF_INET6;
2681         sin->sin6_addr = *gw;
2682         sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
2683         /* Netmask */
2684         sin->sin6_len = sizeof(struct sockaddr_in6);
2685         sin->sin6_family = AF_INET6;
2686         sin->sin6_addr = *(plen2mask(np->rip6_plen));
2687         sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
2688
2689         len = (char *)sin - (char *)buf;
2690         rtm->rtm_msglen = len;
2691         if (write(rtsock, buf, len) > 0)
2692                 return 0;
2693
2694         if (errno == EEXIST) {
2695                 trace(0, "ADD: Route already exists %s/%d gw %s\n",
2696                         inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2697                 if (rtlog)
2698                         fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n",
2699                                 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2700         } else {
2701                 trace(0, "Can not write to rtsock (addroute): %s\n",
2702                         strerror(errno));
2703                 if (rtlog)
2704                         fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2705                                 strerror(errno));
2706         }
2707         return -1;
2708 }
2709
2710 int
2711 delroute(np, gw)
2712         struct netinfo6 *np;
2713         struct in6_addr *gw;
2714 {
2715         u_char  buf[BUFSIZ], buf2[BUFSIZ];
2716         struct  rt_msghdr       *rtm;
2717         struct  sockaddr_in6    *sin;
2718         int     len;
2719
2720         inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2));
2721         tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest),
2722                 np->rip6_plen, buf2);
2723         if (rtlog)
2724                 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n",
2725                         hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2726         if (nflag)
2727                 return 0;
2728
2729         memset(buf, 0, sizeof(buf));
2730         rtm = (struct rt_msghdr *)buf;
2731         rtm->rtm_type = RTM_DELETE;
2732         rtm->rtm_version = RTM_VERSION;
2733         rtm->rtm_seq = ++seq;
2734         rtm->rtm_pid = pid;
2735         rtm->rtm_flags = RTF_UP | RTF_GATEWAY;
2736         if (np->rip6_plen == sizeof(struct in6_addr) * 8)
2737                 rtm->rtm_flags |= RTF_HOST;
2738         rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2739         sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2740         /* Destination */
2741         sin->sin6_len = sizeof(struct sockaddr_in6);
2742         sin->sin6_family = AF_INET6;
2743         sin->sin6_addr = np->rip6_dest;
2744         sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
2745         /* Gateway */
2746         sin->sin6_len = sizeof(struct sockaddr_in6);
2747         sin->sin6_family = AF_INET6;
2748         sin->sin6_addr = *gw;
2749         sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
2750         /* Netmask */
2751         sin->sin6_len = sizeof(struct sockaddr_in6);
2752         sin->sin6_family = AF_INET6;
2753         sin->sin6_addr = *(plen2mask(np->rip6_plen));
2754         sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
2755
2756         len = (char *)sin - (char *)buf;
2757         rtm->rtm_msglen = len;
2758         if (write(rtsock, buf, len) >= 0)
2759                 return 0;
2760
2761         if (errno == ESRCH) {
2762                 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n",
2763                         inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2764                 if (rtlog)
2765                         fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n",
2766                                 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2767         } else {
2768                 trace(0, "Can not write to rtsock (delroute): %s\n",
2769                         strerror(errno));
2770                 if (rtlog)
2771                         fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2772                                 strerror(errno));
2773         }
2774         return -1;
2775 }
2776
2777 struct in6_addr *
2778 getroute(np, gw)
2779         struct netinfo6 *np;
2780         struct in6_addr *gw;
2781 {
2782         u_char buf[BUFSIZ];
2783         u_long myseq;
2784         int len;
2785         struct rt_msghdr *rtm;
2786         struct sockaddr_in6 *sin;
2787
2788         rtm = (struct rt_msghdr *)buf;
2789         len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6);
2790         memset(rtm, 0, len);
2791         rtm->rtm_type = RTM_GET;
2792         rtm->rtm_version = RTM_VERSION;
2793         myseq = ++seq;
2794         rtm->rtm_seq = myseq;
2795         rtm->rtm_addrs = RTA_DST;
2796         rtm->rtm_msglen = len;
2797         sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2798         sin->sin6_len = sizeof(struct sockaddr_in6);
2799         sin->sin6_family = AF_INET6;
2800         sin->sin6_addr = np->rip6_dest;
2801         if (write(rtsock, buf, len) < 0) {
2802                 if (errno == ESRCH)     /* No such route found */
2803                         return NULL;
2804                 perror("write to rtsock");
2805                 exit(1);
2806         }
2807         do {
2808                 if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
2809                         perror("read from rtsock");
2810                         exit(1);
2811                 }
2812                 rtm = (struct rt_msghdr *)buf;
2813         } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid);
2814         sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2815         if (rtm->rtm_addrs & RTA_DST) {
2816                 sin = (struct sockaddr_in6 *)
2817                         ((char *)sin + ROUNDUP(sin->sin6_len));
2818         }
2819         if (rtm->rtm_addrs & RTA_GATEWAY) {
2820                 *gw = sin->sin6_addr;
2821                 return gw;
2822         }
2823         return NULL;
2824 }
2825
2826 const char *
2827 inet6_n2p(p)
2828         const struct in6_addr *p;
2829 {
2830         static char buf[BUFSIZ];
2831
2832         return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf));
2833 }
2834
2835 void
2836 ifrtdump(sig)
2837         int sig;
2838 {
2839
2840         ifdump(sig);
2841         rtdump(sig);
2842 }
2843
2844 void
2845 ifdump(sig)
2846         int sig;
2847 {
2848         struct ifc *ifcp;
2849         FILE *dump;
2850         int i;
2851
2852         if (sig == 0)
2853                 dump = stderr;
2854         else
2855                 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2856                         dump = stderr;
2857
2858         fprintf(dump, "%s: Interface Table Dump\n", hms());
2859         fprintf(dump, "  Number of interfaces: %d\n", nifc);
2860         for (i = 0; i < 2; i++) {
2861                 fprintf(dump, "  %sadvertising interfaces:\n", i ? "non-" : "");
2862                 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
2863                         if (i == 0) {
2864                                 if ((ifcp->ifc_flags & IFF_UP) == 0)
2865                                         continue;
2866                                 if (iff_find(ifcp, 'N') != NULL)
2867                                         continue;
2868                         } else {
2869                                 if (ifcp->ifc_flags & IFF_UP)
2870                                         continue;
2871                         }
2872                         ifdump0(dump, ifcp);
2873                 }
2874         }
2875         fprintf(dump, "\n");
2876         if (dump != stderr)
2877                 fclose(dump);
2878 }
2879
2880 void
2881 ifdump0(dump, ifcp)
2882         FILE *dump;
2883         const struct ifc *ifcp;
2884 {
2885         struct ifac *ifa;
2886         struct iff *iffp;
2887         char buf[BUFSIZ];
2888         const char *ft;
2889         int addr;
2890
2891         fprintf(dump, "    %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n",
2892                 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags),
2893                 inet6_n2p(&ifcp->ifc_mylladdr),
2894                 ifcp->ifc_mtu, ifcp->ifc_metric);
2895         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2896                 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
2897                         inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr,
2898                                 buf, sizeof(buf));
2899                         fprintf(dump, "\t%s/%d -- %s\n",
2900                                 inet6_n2p(&ifa->ifa_addr),
2901                                 ifa->ifa_plen, buf);
2902                 } else {
2903                         fprintf(dump, "\t%s/%d\n",
2904                                 inet6_n2p(&ifa->ifa_addr),
2905                                 ifa->ifa_plen);
2906                 }
2907         }
2908         if (ifcp->ifc_filter) {
2909                 fprintf(dump, "\tFilter:");
2910                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
2911                         addr = 0;
2912                         switch (iffp->iff_type) {
2913                         case 'A':
2914                                 ft = "Aggregate"; addr++; break;
2915                         case 'N':
2916                                 ft = "No-use"; break;
2917                         case 'O':
2918                                 ft = "Advertise-only"; addr++; break;
2919                         case 'T':
2920                                 ft = "Default-only"; break;
2921                         case 'L':
2922                                 ft = "Listen-only"; addr++; break;
2923                         default:
2924                                 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type);
2925                                 ft = buf;
2926                                 addr++;
2927                                 break;
2928                         }
2929                         fprintf(dump, " %s", ft);
2930                         if (addr) {
2931                                 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr),
2932                                         iffp->iff_plen);
2933                         }
2934                 }
2935                 fprintf(dump, "\n");
2936         }
2937 }
2938
2939 void
2940 rtdump(sig)
2941         int sig;
2942 {
2943         struct  riprt *rrt;
2944         char    buf[BUFSIZ];
2945         FILE    *dump;
2946         time_t  t, age;
2947
2948         if (sig == 0)
2949                 dump = stderr;
2950         else
2951                 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2952                         dump = stderr;
2953
2954         t = time(NULL);
2955         fprintf(dump, "\n%s: Routing Table Dump\n", hms());
2956         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
2957                 if (rrt->rrt_t == 0)
2958                         age = 0;
2959                 else
2960                         age = t - rrt->rrt_t;
2961                 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest,
2962                         buf, sizeof(buf));
2963                 fprintf(dump, "    %s/%d if(%d:%s) gw(%s) [%d] age(%ld)",
2964                         buf, rrt->rrt_info.rip6_plen, rrt->rrt_index,
2965                         index2ifc[rrt->rrt_index]->ifc_name,
2966                         inet6_n2p(&rrt->rrt_gw),
2967                         rrt->rrt_info.rip6_metric, (long)age);
2968                 if (rrt->rrt_info.rip6_tag) {
2969                         fprintf(dump, " tag(0x%04x)",
2970                                 ntohs(rrt->rrt_info.rip6_tag) & 0xffff);
2971                 }
2972                 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)
2973                         fprintf(dump, " NOT-LL");
2974                 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
2975                         fprintf(dump, " NO-ADV");
2976                 fprintf(dump, "\n");
2977         }
2978         fprintf(dump, "\n");
2979         if (dump != stderr)
2980                 fclose(dump);
2981 }
2982
2983 /*
2984  * Parse the -A (and -O) options and put corresponding filter object to the
2985  * specified interface structures.  Each of the -A/O option has the following
2986  * syntax:      -A 5f09:c400::/32,ef0,ef1  (aggregate)
2987  *              -O 5f09:c400::/32,ef0,ef1  (only when match)
2988  */
2989 void
2990 filterconfig()
2991 {
2992         int i;
2993         char *p, *ap, *iflp, *ifname;
2994         struct iff ftmp, *iff_obj;
2995         struct ifc *ifcp;
2996         struct riprt *rrt;
2997 #if 0
2998         struct in6_addr gw;
2999 #endif
3000
3001         for (i = 0; i < nfilter; i++) {
3002                 ap = filter[i];
3003                 iflp = NULL;
3004                 ifcp = NULL;
3005                 if (filtertype[i] == 'N' || filtertype[i] == 'T') {
3006                         iflp = ap;
3007                         goto ifonly;
3008                 }
3009                 if ((p = index(ap, ',')) != NULL) {
3010                         *p++ = '\0';
3011                         iflp = p;
3012                 }
3013                 if ((p = index(ap, '/')) == NULL) {
3014                         fatal("no prefixlen specified for '%s'", ap);
3015                         /*NOTREACHED*/
3016                 }
3017                 *p++ = '\0';
3018                 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) {
3019                         fatal("invalid prefix specified for '%s'", ap);
3020                         /*NOTREACHED*/
3021                 }
3022                 ftmp.iff_plen = atoi(p);
3023                 ftmp.iff_next = NULL;
3024                 applyplen(&ftmp.iff_addr, ftmp.iff_plen);
3025 ifonly:
3026                 ftmp.iff_type = filtertype[i];
3027                 if (iflp == NULL || *iflp == '\0') {
3028                         fatal("no interface specified for '%s'", ap);
3029                         /*NOTREACHED*/
3030                 }
3031                 /* parse the interface listing portion */
3032                 while (iflp) {
3033                         ifname = iflp;
3034                         if ((iflp = index(iflp, ',')) != NULL)
3035                                 *iflp++ = '\0';
3036                         ifcp = ifc_find(ifname);
3037                         if (ifcp == NULL) {
3038                                 fatal("no interface %s exists", ifname);
3039                                 /*NOTREACHED*/
3040                         }
3041                         iff_obj = (struct iff *)malloc(sizeof(struct iff));
3042                         if (iff_obj == NULL) {
3043                                 fatal("malloc of iff_obj");
3044                                 /*NOTREACHED*/
3045                         }
3046                         memcpy((void *)iff_obj, (void *)&ftmp,
3047                             sizeof(struct iff));
3048                         /* link it to the interface filter */
3049                         iff_obj->iff_next = ifcp->ifc_filter;
3050                         ifcp->ifc_filter = iff_obj;
3051                 }
3052
3053                 /*
3054                  * -A: aggregate configuration.
3055                  */
3056                 if (filtertype[i] != 'A')
3057                         continue;
3058                 /* put the aggregate to the kernel routing table */
3059                 rrt = (struct riprt *)malloc(sizeof(struct riprt));
3060                 if (rrt == NULL) {
3061                         fatal("malloc: rrt");
3062                         /*NOTREACHED*/
3063                 }
3064                 memset(rrt, 0, sizeof(struct riprt));
3065                 rrt->rrt_info.rip6_dest = ftmp.iff_addr;
3066                 rrt->rrt_info.rip6_plen = ftmp.iff_plen;
3067                 rrt->rrt_info.rip6_metric = 1;
3068                 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
3069                 rrt->rrt_gw = in6addr_loopback;
3070                 rrt->rrt_flags = RTF_UP | RTF_REJECT;
3071                 rrt->rrt_rflags = RRTF_AGGREGATE;
3072                 rrt->rrt_t = 0;
3073                 rrt->rrt_index = loopifindex;
3074 #if 0
3075                 if (getroute(&rrt->rrt_info, &gw)) {
3076 #if 0
3077                         /*
3078                          * When the address has already been registered in the
3079                          * kernel routing table, it should be removed
3080                          */
3081                         delroute(&rrt->rrt_info, &gw);
3082 #else
3083                         /* it is safer behavior */
3084                         errno = EINVAL;
3085                         fatal("%s/%u already in routing table, "
3086                             "cannot aggregate",
3087                             inet6_n2p(&rrt->rrt_info.rip6_dest),
3088                             rrt->rrt_info.rip6_plen);
3089                         /*NOTREACHED*/
3090 #endif
3091                 }
3092 #endif
3093                 /* Put the route to the list */
3094                 rrt->rrt_next = riprt;
3095                 riprt = rrt;
3096                 trace(1, "Aggregate: %s/%d for %s\n",
3097                         inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen,
3098                         ifcp->ifc_name);
3099                 /* Add this route to the kernel */
3100                 if (nflag)      /* do not modify kernel routing table */
3101                         continue;
3102                 addroute(rrt, &in6addr_loopback, loopifcp);
3103         }
3104 }
3105
3106 /***************** utility functions *****************/
3107
3108 /*
3109  * Returns a pointer to ifac whose address and prefix length matches
3110  * with the address and prefix length specified in the arguments.
3111  */
3112 struct ifac *
3113 ifa_match(ifcp, ia, plen)
3114         const struct ifc *ifcp;
3115         const struct in6_addr *ia;
3116         int plen;
3117 {
3118         struct ifac *ifa;
3119
3120         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
3121                 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) &&
3122                     ifa->ifa_plen == plen)
3123                         break;
3124         }
3125         return ifa;
3126 }
3127
3128 /*
3129  * Return a pointer to riprt structure whose address and prefix length
3130  * matches with the address and prefix length found in the argument.
3131  * Note: This is not a rtalloc().  Therefore exact match is necessary.
3132  */
3133 struct riprt *
3134 rtsearch(np, prev_rrt)
3135         struct  netinfo6 *np;
3136         struct  riprt **prev_rrt;
3137 {
3138         struct  riprt   *rrt;
3139
3140         if (prev_rrt)
3141                 *prev_rrt = NULL;
3142         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
3143                 if (rrt->rrt_info.rip6_plen == np->rip6_plen &&
3144                     IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
3145                                        &np->rip6_dest))
3146                         return rrt;
3147                 if (prev_rrt)
3148                         *prev_rrt = rrt;
3149         }
3150         if (prev_rrt)
3151                 *prev_rrt = NULL;
3152         return 0;
3153 }
3154
3155 int
3156 sin6mask2len(sin6)
3157         const struct sockaddr_in6 *sin6;
3158 {
3159
3160         return mask2len(&sin6->sin6_addr,
3161             sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr));
3162 }
3163
3164 int
3165 mask2len(addr, lenlim)
3166         const struct in6_addr *addr;
3167         int lenlim;
3168 {
3169         int i = 0, j;
3170         const u_char *p = (const u_char *)addr;
3171
3172         for (j = 0; j < lenlim; j++, p++) {
3173                 if (*p != 0xff)
3174                         break;
3175                 i += 8;
3176         }
3177         if (j < lenlim) {
3178                 switch (*p) {
3179 #define MASKLEN(m, l)   case m: do { i += l; break; } while (0)
3180                 MASKLEN(0xfe, 7); break;
3181                 MASKLEN(0xfc, 6); break;
3182                 MASKLEN(0xf8, 5); break;
3183                 MASKLEN(0xf0, 4); break;
3184                 MASKLEN(0xe0, 3); break;
3185                 MASKLEN(0xc0, 2); break;
3186                 MASKLEN(0x80, 1); break;
3187 #undef  MASKLEN
3188                 }
3189         }
3190         return i;
3191 }
3192
3193 void
3194 applymask(addr, mask)
3195         struct in6_addr *addr, *mask;
3196 {
3197         int     i;
3198         u_long  *p, *q;
3199
3200         p = (u_long *)addr; q = (u_long *)mask;
3201         for (i = 0; i < 4; i++)
3202                 *p++ &= *q++;
3203 }
3204
3205 static const u_char plent[8] = {
3206         0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
3207 };
3208
3209 void
3210 applyplen(ia, plen)
3211         struct  in6_addr *ia;
3212         int     plen;
3213 {
3214         u_char  *p;
3215         int     i;
3216
3217         p = ia->s6_addr;
3218         for (i = 0; i < 16; i++) {
3219                 if (plen <= 0)
3220                         *p = 0;
3221                 else if (plen < 8)
3222                         *p &= plent[plen];
3223                 p++, plen -= 8;
3224         }
3225 }
3226
3227 static const int pl2m[9] = {
3228         0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
3229 };
3230
3231 struct in6_addr *
3232 plen2mask(n)
3233         int     n;
3234 {
3235         static struct in6_addr ia;
3236         u_char  *p;
3237         int     i;
3238
3239         memset(&ia, 0, sizeof(struct in6_addr));
3240         p = (u_char *)&ia;
3241         for (i = 0; i < 16; i++, p++, n -= 8) {
3242                 if (n >= 8) {
3243                         *p = 0xff;
3244                         continue;
3245                 }
3246                 *p = pl2m[n];
3247                 break;
3248         }
3249         return &ia;
3250 }
3251
3252 char *
3253 allocopy(p)
3254         char *p;
3255 {
3256         char *q = (char *)malloc(strlen(p) + 1);
3257
3258         strcpy(q, p);
3259         return q;
3260 }
3261
3262 char *
3263 hms()
3264 {
3265         static char buf[BUFSIZ];
3266         time_t t;
3267         struct  tm *tm;
3268
3269         t = time(NULL);
3270         if ((tm = localtime(&t)) == 0) {
3271                 fatal("localtime");
3272                 /*NOTREACHED*/
3273         }
3274         snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min,
3275             tm->tm_sec);
3276         return buf;
3277 }
3278
3279 #define RIPRANDDEV      1.0     /* 30 +- 15, max - min = 30 */
3280
3281 int
3282 ripinterval(timer)
3283         int timer;
3284 {
3285         double r = rand();
3286
3287         interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5));
3288         nextalarm = time(NULL) + interval;
3289         return interval;
3290 }
3291
3292 time_t
3293 ripsuptrig()
3294 {
3295         time_t t;
3296
3297         double r = rand();
3298         t  = (int)(RIP_TRIG_INT6_MIN +
3299                 (RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX));
3300         sup_trig_update = time(NULL) + t;
3301         return t;
3302 }
3303
3304 void
3305 #ifdef __STDC__
3306 fatal(const char *fmt, ...)
3307 #else
3308 fatal(fmt, va_alist)
3309         char    *fmt;
3310         va_dcl
3311 #endif
3312 {
3313         va_list ap;
3314         char buf[1024];
3315
3316 #ifdef __STDC__
3317         va_start(ap, fmt);
3318 #else
3319         va_start(ap);
3320 #endif
3321         vsnprintf(buf, sizeof(buf), fmt, ap);
3322         perror(buf);
3323         syslog(LOG_ERR, "%s: %s", buf, strerror(errno));
3324         rtdexit();
3325         va_end(ap);
3326 }
3327
3328 void
3329 #ifdef __STDC__
3330 tracet(int level, const char *fmt, ...)
3331 #else
3332 tracet(level, fmt, va_alist)
3333         int level;
3334         char *fmt;
3335         va_dcl
3336 #endif
3337 {
3338         va_list ap;
3339
3340 #ifdef __STDC__
3341         va_start(ap, fmt);
3342 #else
3343         va_start(ap);
3344 #endif
3345         if (level <= dflag) {
3346                 fprintf(stderr, "%s: ", hms());
3347                 vfprintf(stderr, fmt, ap);
3348         }
3349         if (dflag) {
3350                 if (level > 0)
3351                         vsyslog(LOG_DEBUG, fmt, ap);
3352                 else
3353                         vsyslog(LOG_WARNING, fmt, ap);
3354         }
3355         va_end(ap);
3356 }
3357
3358 void
3359 #ifdef __STDC__
3360 trace(int level, const char *fmt, ...)
3361 #else
3362 trace(level, fmt, va_alist)
3363         int level;
3364         char *fmt;
3365         va_dcl
3366 #endif
3367 {
3368         va_list ap;
3369
3370 #ifdef __STDC__
3371         va_start(ap, fmt);
3372 #else
3373         va_start(ap);
3374 #endif
3375         if (level <= dflag)
3376                 vfprintf(stderr, fmt, ap);
3377         if (dflag) {
3378                 if (level > 0)
3379                         vsyslog(LOG_DEBUG, fmt, ap);
3380                 else
3381                         vsyslog(LOG_WARNING, fmt, ap);
3382         }
3383         va_end(ap);
3384 }
3385
3386 unsigned int
3387 if_maxindex()
3388 {
3389         struct if_nameindex *p, *p0;
3390         unsigned int max = 0;
3391
3392         p0 = if_nameindex();
3393         for (p = p0; p && p->if_index && p->if_name; p++) {
3394                 if (max < p->if_index)
3395                         max = p->if_index;
3396         }
3397         if_freenameindex(p0);
3398         return max;
3399 }
3400
3401 struct ifc *
3402 ifc_find(name)
3403         char *name;
3404 {
3405         struct ifc *ifcp;
3406
3407         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
3408                 if (strcmp(name, ifcp->ifc_name) == 0)
3409                         return ifcp;
3410         }
3411         return (struct ifc *)NULL;
3412 }
3413
3414 struct iff *
3415 iff_find(ifcp, type)
3416         struct ifc *ifcp;
3417         int type;
3418 {
3419         struct iff *iffp;
3420
3421         for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
3422                 if (iffp->iff_type == type)
3423                         return iffp;
3424         }
3425         return NULL;
3426 }
3427
3428 void
3429 setindex2ifc(idx, ifcp)
3430         int idx;
3431         struct ifc *ifcp;
3432 {
3433         int n;
3434         struct ifc **p;
3435
3436         if (!index2ifc) {
3437                 nindex2ifc = 5; /*initial guess*/
3438                 index2ifc = (struct ifc **)
3439                         malloc(sizeof(*index2ifc) * nindex2ifc);
3440                 if (index2ifc == NULL) {
3441                         fatal("malloc");
3442                         /*NOTREACHED*/
3443                 }
3444                 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc);
3445         }
3446         n = nindex2ifc;
3447         while (nindex2ifc <= idx)
3448                 nindex2ifc *= 2;
3449         if (n != nindex2ifc) {
3450                 p = (struct ifc **)realloc(index2ifc,
3451                     sizeof(*index2ifc) * nindex2ifc);
3452                 if (p == NULL) {
3453                         fatal("realloc");
3454                         /*NOTREACHED*/
3455                 }
3456                 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n));
3457                 index2ifc = p;
3458         }
3459         index2ifc[idx] = ifcp;
3460 }