usr.sbin/route6d/route6d.c

   1 /*      $FreeBSD$       */
   2 /*      $KAME: route6d.c,v 1.104 2003/10/31 00:30:20 itojun Exp $       */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef lint
  34 static const char _rcsid[] = "$KAME: route6d.c,v 1.104 2003/10/31 00:30:20 itojun Exp $";
  35 #endif
  36
  37 #include <sys/param.h>
  38 #include <sys/file.h>
  39 #include <sys/ioctl.h>
  40 #include <sys/socket.h>
  41 #include <sys/sysctl.h>
  42 #include <sys/uio.h>
  43 #include <arpa/inet.h>
  44 #include <net/if.h>
  45 #include <net/if_var.h>
  46 #include <net/route.h>
  47 #include <netinet/in.h>
  48 #include <netinet/in_var.h>
  49 #include <netinet/ip6.h>
  50 #include <netinet/udp.h>
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <fnmatch.h>
  54 #include <ifaddrs.h>
  55 #include <netdb.h>
  56 #ifdef HAVE_POLL_H
  57 #include <poll.h>
  58 #endif
  59 #include <signal.h>
  60 #include <stdio.h>
  61 #ifdef __STDC__
  62 #include <stdarg.h>
  63 #else
  64 #include <varargs.h>
  65 #endif
  66 #include <stddef.h>
  67 #include <stdlib.h>
  68 #include <string.h>
  69 #include <syslog.h>
  70 #include <time.h>
  71 #include <unistd.h>
  72
  73 #include "route6d.h"
  74
  75 #define MAXFILTER       40
  76 #define RT_DUMP_MAXRETRY        15
  77
  78 #ifdef  DEBUG
  79 #define INIT_INTERVAL6  6
  80 #else
  81 #define INIT_INTERVAL6  10      /* Wait to submit an initial riprequest */
  82 #endif
  83
  84 /* alignment constraint for routing socket */
  85 #define ROUNDUP(a) \
  86         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
  87 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
  88
  89 struct ifc {                    /* Configuration of an interface */
  90         TAILQ_ENTRY(ifc) ifc_next;
  91
  92         char    ifc_name[IFNAMSIZ];             /* if name */
  93         int     ifc_index;                      /* if index */
  94         int     ifc_mtu;                        /* if mtu */
  95         int     ifc_metric;                     /* if metric */
  96         u_int   ifc_flags;                      /* flags */
  97         short   ifc_cflags;                     /* IFC_XXX */
  98         struct  in6_addr ifc_mylladdr;          /* my link-local address */
  99         struct  sockaddr_in6 ifc_ripsin;        /* rip multicast address */
 100         TAILQ_HEAD(, ifac) ifc_ifac_head;       /* list of AF_INET6 addrs */
 101         TAILQ_HEAD(, iff) ifc_iff_head;         /* list of filters */
 102         int     ifc_joined;                     /* joined to ff02::9 */
 103 };
 104 TAILQ_HEAD(, ifc) ifc_head = TAILQ_HEAD_INITIALIZER(ifc_head);
 105
 106 struct ifac {                   /* Adddress associated to an interface */
 107         TAILQ_ENTRY(ifac) ifac_next;
 108
 109         struct  ifc *ifac_ifc;          /* back pointer */
 110         struct  in6_addr ifac_addr;     /* address */
 111         struct  in6_addr ifac_raddr;    /* remote address, valid in p2p */
 112         int     ifac_scope_id;          /* scope id */
 113         int     ifac_plen;              /* prefix length */
 114 };
 115
 116 struct iff {                    /* Filters for an interface */
 117         TAILQ_ENTRY(iff) iff_next;
 118
 119         int     iff_type;
 120         struct  in6_addr iff_addr;
 121         int     iff_plen;
 122 };
 123
 124 struct  ifc **index2ifc;
 125 unsigned int    nindex2ifc;
 126 struct  ifc *loopifcp = NULL;   /* pointing to loopback */
 127 #ifdef HAVE_POLL_H
 128 struct  pollfd set[2];
 129 #else
 130 fd_set  *sockvecp;      /* vector to select() for receiving */
 131 fd_set  *recvecp;
 132 int     fdmasks;
 133 int     maxfd;          /* maximum fd for select() */
 134 #endif
 135 int     rtsock;         /* the routing socket */
 136 int     ripsock;        /* socket to send/receive RIP datagram */
 137
 138 struct  rip6 *ripbuf;   /* packet buffer for sending */
 139
 140 /*
 141  * Maintain the routes in a linked list.  When the number of the routes
 142  * grows, somebody would like to introduce a hash based or a radix tree
 143  * based structure.  I believe the number of routes handled by RIP is
 144  * limited and I don't have to manage a complex data structure, however.
 145  *
 146  * One of the major drawbacks of the linear linked list is the difficulty
 147  * of representing the relationship between a couple of routes.  This may
 148  * be a significant problem when we have to support route aggregation with
 149  * suppressing the specifics covered by the aggregate.
 150  */
 151
 152 struct riprt {
 153         TAILQ_ENTRY(riprt) rrt_next;    /* next destination */
 154
 155         struct  riprt *rrt_same;        /* same destination - future use */
 156         struct  netinfo6 rrt_info;      /* network info */
 157         struct  in6_addr rrt_gw;        /* gateway */
 158         u_long  rrt_flags;              /* kernel routing table flags */
 159         u_long  rrt_rflags;             /* route6d routing table flags */
 160         time_t  rrt_t;                  /* when the route validated */
 161         int     rrt_index;              /* ifindex from which this route got */
 162 };
 163 TAILQ_HEAD(, riprt) riprt_head = TAILQ_HEAD_INITIALIZER(riprt_head);
 164
 165 int     dflag = 0;      /* debug flag */
 166 int     qflag = 0;      /* quiet flag */
 167 int     nflag = 0;      /* don't update kernel routing table */
 168 int     aflag = 0;      /* age out even the statically defined routes */
 169 int     hflag = 0;      /* don't split horizon */
 170 int     lflag = 0;      /* exchange site local routes */
 171 int     Pflag = 0;      /* don't age out routes with RTF_PROTO[123] */
 172 int     Qflag = RTF_PROTO2;     /* set RTF_PROTO[123] flag to routes by RIPng */
 173 int     sflag = 0;      /* announce static routes w/ split horizon */
 174 int     Sflag = 0;      /* announce static routes to every interface */
 175 unsigned long routetag = 0;     /* route tag attached on originating case */
 176
 177 char    *filter[MAXFILTER];
 178 int     filtertype[MAXFILTER];
 179 int     nfilter = 0;
 180
 181 pid_t   pid;
 182
 183 struct  sockaddr_storage ripsin;
 184
 185 int     interval = 1;
 186 time_t  nextalarm = 0;
 187 time_t  sup_trig_update = 0;
 188
 189 FILE    *rtlog = NULL;
 190
 191 int logopened = 0;
 192
 193 static  int     seq = 0;
 194
 195 volatile sig_atomic_t seenalrm;
 196 volatile sig_atomic_t seenquit;
 197 volatile sig_atomic_t seenusr1;
 198
 199 #define RRTF_AGGREGATE          0x08000000
 200 #define RRTF_NOADVERTISE        0x10000000
 201 #define RRTF_NH_NOT_LLADDR      0x20000000
 202 #define RRTF_SENDANYWAY         0x40000000
 203 #define RRTF_CHANGED            0x80000000
 204
 205 int main(int, char **);
 206 void sighandler(int);
 207 void ripalarm(void);
 208 void riprecv(void);
 209 void ripsend(struct ifc *, struct sockaddr_in6 *, int);
 210 int out_filter(struct riprt *, struct ifc *);
 211 void init(void);
 212 void sockopt(struct ifc *);
 213 void ifconfig(void);
 214 int ifconfig1(const char *, const struct sockaddr *, struct ifc *, int);
 215 void rtrecv(void);
 216 int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *,
 217         const struct sockaddr_in6 *);
 218 int rt_deladdr(struct ifc *, const struct sockaddr_in6 *,
 219         const struct sockaddr_in6 *);
 220 void filterconfig(void);
 221 int getifmtu(int);
 222 const char *rttypes(struct rt_msghdr *);
 223 const char *rtflags(struct rt_msghdr *);
 224 const char *ifflags(int);
 225 int ifrt(struct ifc *, int);
 226 void ifrt_p2p(struct ifc *, int);
 227 void applymask(struct in6_addr *, struct in6_addr *);
 228 void applyplen(struct in6_addr *, int);
 229 void ifrtdump(int);
 230 void ifdump(int);
 231 void ifdump0(FILE *, const struct ifc *);
 232 void ifremove(int);
 233 void rtdump(int);
 234 void rt_entry(struct rt_msghdr *, int);
 235 void rtdexit(void);
 236 void riprequest(struct ifc *, struct netinfo6 *, int,
 237         struct sockaddr_in6 *);
 238 void ripflush(struct ifc *, struct sockaddr_in6 *, int, struct netinfo6 *np);
 239 void sendrequest(struct ifc *);
 240 int sin6mask2len(const struct sockaddr_in6 *);
 241 int mask2len(const struct in6_addr *, int);
 242 int sendpacket(struct sockaddr_in6 *, int);
 243 int addroute(struct riprt *, const struct in6_addr *, struct ifc *);
 244 int delroute(struct netinfo6 *, struct in6_addr *);
 245 struct in6_addr *getroute(struct netinfo6 *, struct in6_addr *);
 246 void krtread(int);
 247 int tobeadv(struct riprt *, struct ifc *);
 248 char *allocopy(char *);
 249 char *hms(void);
 250 const char *inet6_n2p(const struct in6_addr *);
 251 struct ifac *ifa_match(const struct ifc *, const struct in6_addr *, int);
 252 struct in6_addr *plen2mask(int);
 253 struct riprt *rtsearch(struct netinfo6 *);
 254 int ripinterval(int);
 255 time_t ripsuptrig(void);
 256 void fatal(const char *, ...)
 257         __attribute__((__format__(__printf__, 1, 2)));
 258 void trace(int, const char *, ...)
 259         __attribute__((__format__(__printf__, 2, 3)));
 260 void tracet(int, const char *, ...)
 261         __attribute__((__format__(__printf__, 2, 3)));
 262 unsigned int if_maxindex(void);
 263 struct ifc *ifc_find(char *);
 264 struct iff *iff_find(struct ifc *, int);
 265 void setindex2ifc(int, struct ifc *);
 266
 267 #define MALLOC(type)    ((type *)malloc(sizeof(type)))
 268
 269 #define IFIL_TYPE_ANY   0x0
 270 #define IFIL_TYPE_A     'A'
 271 #define IFIL_TYPE_N     'N'
 272 #define IFIL_TYPE_T     'T'
 273 #define IFIL_TYPE_O     'O'
 274 #define IFIL_TYPE_L     'L'
 275
 276 int
 277 main(int argc, char *argv[])
 278 {
 279         int     ch;
 280         int     error = 0;
 281         unsigned long proto;
 282         struct  ifc *ifcp;
 283         sigset_t mask, omask;
 284         const char *pidfile = ROUTE6D_PID;
 285         FILE *pidfh;
 286         char *progname;
 287         char *ep;
 288
 289         progname = strrchr(*argv, '/');
 290         if (progname)
 291                 progname++;
 292         else
 293                 progname = *argv;
 294
 295         pid = getpid();
 296         while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnp:P:Q:qsS")) != -1) {
 297                 switch (ch) {
 298                 case 'A':
 299                 case 'N':
 300                 case 'O':
 301                 case 'T':
 302                 case 'L':
 303                         if (nfilter >= MAXFILTER) {
 304                                 fatal("Exceeds MAXFILTER");
 305                                 /*NOTREACHED*/
 306                         }
 307                         filtertype[nfilter] = ch;
 308                         filter[nfilter++] = allocopy(optarg);
 309                         break;
 310                 case 't':
 311                         ep = NULL;
 312                         routetag = strtoul(optarg, &ep, 0);
 313                         if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) {
 314                                 fatal("invalid route tag");
 315                                 /*NOTREACHED*/
 316                         }
 317                         break;
 318                 case 'p':
 319                         pidfile = optarg;
 320                         break;
 321                 case 'P':
 322                         ep = NULL;
 323                         proto = strtoul(optarg, &ep, 0);
 324                         if (!ep || *ep != '\0' || 3 < proto) {
 325                                 fatal("invalid P flag");
 326                                 /*NOTREACHED*/
 327                         }
 328                         if (proto == 0)
 329                                 Pflag = 0;
 330                         if (proto == 1)
 331                                 Pflag |= RTF_PROTO1;
 332                         if (proto == 2)
 333                                 Pflag |= RTF_PROTO2;
 334                         if (proto == 3)
 335                                 Pflag |= RTF_PROTO3;
 336                         break;
 337                 case 'Q':
 338                         ep = NULL;
 339                         proto = strtoul(optarg, &ep, 0);
 340                         if (!ep || *ep != '\0' || 3 < proto) {
 341                                 fatal("invalid Q flag");
 342                                 /*NOTREACHED*/
 343                         }
 344                         if (proto == 0)
 345                                 Qflag = 0;
 346                         if (proto == 1)
 347                                 Qflag |= RTF_PROTO1;
 348                         if (proto == 2)
 349                                 Qflag |= RTF_PROTO2;
 350                         if (proto == 3)
 351                                 Qflag |= RTF_PROTO3;
 352                         break;
 353                 case 'R':
 354                         if ((rtlog = fopen(optarg, "w")) == NULL) {
 355                                 fatal("Can not write to routelog");
 356                                 /*NOTREACHED*/
 357                         }
 358                         break;
 359 #define FLAG(c, flag, n)        case c: do { flag = n; break; } while(0)
 360                 FLAG('a', aflag, 1); break;
 361                 FLAG('d', dflag, 1); break;
 362                 FLAG('D', dflag, 2); break;
 363                 FLAG('h', hflag, 1); break;
 364                 FLAG('l', lflag, 1); break;
 365                 FLAG('n', nflag, 1); break;
 366                 FLAG('q', qflag, 1); break;
 367                 FLAG('s', sflag, 1); break;
 368                 FLAG('S', Sflag, 1); break;
 369 #undef  FLAG
 370                 default:
 371                         fatal("Invalid option specified, terminating");
 372                         /*NOTREACHED*/
 373                 }
 374         }
 375         argc -= optind;
 376         argv += optind;
 377         if (argc > 0) {
 378                 fatal("bogus extra arguments");
 379                 /*NOTREACHED*/
 380         }
 381
 382         if (geteuid()) {
 383                 nflag = 1;
 384                 fprintf(stderr, "No kernel update is allowed\n");
 385         }
 386
 387         if (dflag == 0) {
 388                 if (daemon(0, 0) < 0) {
 389                         fatal("daemon");
 390                         /*NOTREACHED*/
 391                 }
 392         }
 393
 394         openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
 395         logopened++;
 396
 397         if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL)
 398                 fatal("malloc");
 399         memset(ripbuf, 0, RIP6_MAXMTU);
 400         ripbuf->rip6_cmd = RIP6_RESPONSE;
 401         ripbuf->rip6_vers = RIP6_VERSION;
 402         ripbuf->rip6_res1[0] = 0;
 403         ripbuf->rip6_res1[1] = 0;
 404
 405         init();
 406         ifconfig();
 407         TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
 408                 if (ifcp->ifc_index < 0) {
 409                         fprintf(stderr, "No ifindex found at %s "
 410                             "(no link-local address?)\n", ifcp->ifc_name);
 411                         error++;
 412                 }
 413         }
 414         if (error)
 415                 exit(1);
 416         if (loopifcp == NULL) {
 417                 fatal("No loopback found");
 418                 /*NOTREACHED*/
 419         }
 420         TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
 421                 ifrt(ifcp, 0);
 422         }
 423         filterconfig();
 424         krtread(0);
 425         if (dflag)
 426                 ifrtdump(0);
 427
 428         pid = getpid();
 429         if ((pidfh = fopen(pidfile, "w")) != NULL) {
 430                 fprintf(pidfh, "%d\n", pid);
 431                 fclose(pidfh);
 432         }
 433
 434         if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) {
 435                 fatal("malloc");
 436                 /*NOTREACHED*/
 437         }
 438         memset(ripbuf, 0, RIP6_MAXMTU);
 439         ripbuf->rip6_cmd = RIP6_RESPONSE;
 440         ripbuf->rip6_vers = RIP6_VERSION;
 441         ripbuf->rip6_res1[0] = 0;
 442         ripbuf->rip6_res1[1] = 0;
 443
 444         if (signal(SIGALRM, sighandler) == SIG_ERR ||
 445             signal(SIGQUIT, sighandler) == SIG_ERR ||
 446             signal(SIGTERM, sighandler) == SIG_ERR ||
 447             signal(SIGUSR1, sighandler) == SIG_ERR ||
 448             signal(SIGHUP, sighandler) == SIG_ERR ||
 449             signal(SIGINT, sighandler) == SIG_ERR) {
 450                 fatal("signal");
 451                 /*NOTREACHED*/
 452         }
 453         /*
 454          * To avoid rip packet congestion (not on a cable but in this
 455          * process), wait for a moment to send the first RIP6_RESPONSE
 456          * packets.
 457          */
 458         alarm(ripinterval(INIT_INTERVAL6));
 459
 460         TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
 461                 if (iff_find(ifcp, IFIL_TYPE_N) != NULL)
 462                         continue;
 463                 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
 464                         sendrequest(ifcp);
 465         }
 466
 467         syslog(LOG_INFO, "**** Started ****");
 468         sigemptyset(&mask);
 469         sigaddset(&mask, SIGALRM);
 470         while (1) {
 471                 if (seenalrm) {
 472                         ripalarm();
 473                         seenalrm = 0;
 474                         continue;
 475                 }
 476                 if (seenquit) {
 477                         rtdexit();
 478                         seenquit = 0;
 479                         continue;
 480                 }
 481                 if (seenusr1) {
 482                         ifrtdump(SIGUSR1);
 483                         seenusr1 = 0;
 484                         continue;
 485                 }
 486
 487 #ifdef HAVE_POLL_H
 488                 switch (poll(set, 2, INFTIM))
 489 #else
 490                 memcpy(recvecp, sockvecp, fdmasks);
 491                 switch (select(maxfd + 1, recvecp, 0, 0, 0))
 492 #endif
 493                 {
 494                 case -1:
 495                         if (errno != EINTR) {
 496                                 fatal("select");
 497                                 /*NOTREACHED*/
 498                         }
 499                         continue;
 500                 case 0:
 501                         continue;
 502                 default:
 503 #ifdef HAVE_POLL_H
 504                         if (set[0].revents & POLLIN)
 505 #else
 506                         if (FD_ISSET(ripsock, recvecp))
 507 #endif
 508                         {
 509                                 sigprocmask(SIG_BLOCK, &mask, &omask);
 510                                 riprecv();
 511                                 sigprocmask(SIG_SETMASK, &omask, NULL);
 512                         }
 513 #ifdef HAVE_POLL_H
 514                         if (set[1].revents & POLLIN)
 515 #else
 516                         if (FD_ISSET(rtsock, recvecp))
 517 #endif
 518                         {
 519                                 sigprocmask(SIG_BLOCK, &mask, &omask);
 520                                 rtrecv();
 521                                 sigprocmask(SIG_SETMASK, &omask, NULL);
 522                         }
 523                 }
 524         }
 525 }
 526
 527 void
 528 sighandler(int signo)
 529 {
 530
 531         switch (signo) {
 532         case SIGALRM:
 533                 seenalrm++;
 534                 break;
 535         case SIGQUIT:
 536         case SIGTERM:
 537                 seenquit++;
 538                 break;
 539         case SIGUSR1:
 540         case SIGHUP:
 541         case SIGINT:
 542                 seenusr1++;
 543                 break;
 544         }
 545 }
 546
 547 /*
 548  * gracefully exits after resetting sockopts.
 549  */
 550 /* ARGSUSED */
 551 void
 552 rtdexit(void)
 553 {
 554         struct  riprt *rrt;
 555
 556         alarm(0);
 557         TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
 558                 if (rrt->rrt_rflags & RRTF_AGGREGATE) {
 559                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
 560                 }
 561         }
 562         close(ripsock);
 563         close(rtsock);
 564         syslog(LOG_INFO, "**** Terminated ****");
 565         closelog();
 566         exit(1);
 567 }
 568
 569 /*
 570  * Called periodically:
 571  *      1. age out the learned route. remove it if necessary.
 572  *      2. submit RIP6_RESPONSE packets.
 573  * Invoked in every SUPPLY_INTERVAL6 (30) seconds.  I believe we don't have
 574  * to invoke this function in every 1 or 5 or 10 seconds only to age the
 575  * routes more precisely.
 576  */
 577 /* ARGSUSED */
 578 void
 579 ripalarm(void)
 580 {
 581         struct  ifc *ifcp;
 582         struct  riprt *rrt, *rrt_tmp;
 583         time_t  t_lifetime, t_holddown;
 584
 585         /* age the RIP routes */
 586         t_lifetime = time(NULL) - RIP_LIFETIME;
 587         t_holddown = t_lifetime - RIP_HOLDDOWN;
 588         TAILQ_FOREACH_SAFE(rrt, &riprt_head, rrt_next, rrt_tmp) {
 589                 if (rrt->rrt_t == 0)
 590                         continue;
 591                 else if (rrt->rrt_t < t_holddown) {
 592                         TAILQ_REMOVE(&riprt_head, rrt, rrt_next);
 593                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
 594                         free(rrt);
 595                 } else if (rrt->rrt_t < t_lifetime)
 596                         rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
 597         }
 598         /* Supply updates */
 599         TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
 600                 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
 601                         ripsend(ifcp, &ifcp->ifc_ripsin, 0);
 602         }
 603         alarm(ripinterval(SUPPLY_INTERVAL6));
 604 }
 605
 606 void
 607 init(void)
 608 {
 609         int     error;
 610         const int int0 = 0, int1 = 1, int255 = 255;
 611         struct  addrinfo hints, *res;
 612         char    port[NI_MAXSERV];
 613
 614         TAILQ_INIT(&ifc_head);
 615         nindex2ifc = 0; /*initial guess*/
 616         index2ifc = NULL;
 617         snprintf(port, sizeof(port), "%u", RIP6_PORT);
 618
 619         memset(&hints, 0, sizeof(hints));
 620         hints.ai_family = PF_INET6;
 621         hints.ai_socktype = SOCK_DGRAM;
 622         hints.ai_protocol = IPPROTO_UDP;
 623         hints.ai_flags = AI_PASSIVE;
 624         error = getaddrinfo(NULL, port, &hints, &res);
 625         if (error) {
 626                 fatal("%s", gai_strerror(error));
 627                 /*NOTREACHED*/
 628         }
 629         if (res->ai_next) {
 630                 fatal(":: resolved to multiple address");
 631                 /*NOTREACHED*/
 632         }
 633
 634         ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
 635         if (ripsock < 0) {
 636                 fatal("rip socket");
 637                 /*NOTREACHED*/
 638         }
 639 #ifdef IPV6_V6ONLY
 640         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_V6ONLY,
 641             &int1, sizeof(int1)) < 0) {
 642                 fatal("rip IPV6_V6ONLY");
 643                 /*NOTREACHED*/
 644         }
 645 #endif
 646         if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) {
 647                 fatal("rip bind");
 648                 /*NOTREACHED*/
 649         }
 650         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
 651             &int255, sizeof(int255)) < 0) {
 652                 fatal("rip IPV6_MULTICAST_HOPS");
 653                 /*NOTREACHED*/
 654         }
 655         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
 656             &int0, sizeof(int0)) < 0) {
 657                 fatal("rip IPV6_MULTICAST_LOOP");
 658                 /*NOTREACHED*/
 659         }
 660
 661 #ifdef IPV6_RECVPKTINFO
 662         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO,
 663             &int1, sizeof(int1)) < 0) {
 664                 fatal("rip IPV6_RECVPKTINFO");
 665                 /*NOTREACHED*/
 666         }
 667 #else  /* old adv. API */
 668         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO,
 669             &int1, sizeof(int1)) < 0) {
 670                 fatal("rip IPV6_PKTINFO");
 671                 /*NOTREACHED*/
 672         }
 673 #endif
 674
 675 #ifdef IPV6_RECVPKTINFO
 676         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
 677             &int1, sizeof(int1)) < 0) {
 678                 fatal("rip IPV6_RECVHOPLIMIT");
 679                 /*NOTREACHED*/
 680         }
 681 #else  /* old adv. API */
 682         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_HOPLIMIT,
 683             &int1, sizeof(int1)) < 0) {
 684                 fatal("rip IPV6_HOPLIMIT");
 685                 /*NOTREACHED*/
 686         }
 687 #endif
 688
 689         memset(&hints, 0, sizeof(hints));
 690         hints.ai_family = PF_INET6;
 691         hints.ai_socktype = SOCK_DGRAM;
 692         hints.ai_protocol = IPPROTO_UDP;
 693         error = getaddrinfo(RIP6_DEST, port, &hints, &res);
 694         if (error) {
 695                 fatal("%s", gai_strerror(error));
 696                 /*NOTREACHED*/
 697         }
 698         if (res->ai_next) {
 699                 fatal("%s resolved to multiple address", RIP6_DEST);
 700                 /*NOTREACHED*/
 701         }
 702         memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
 703
 704 #ifdef HAVE_POLL_H
 705         set[0].fd = ripsock;
 706         set[0].events = POLLIN;
 707 #else
 708         maxfd = ripsock;
 709 #endif
 710
 711         if (nflag == 0) {
 712                 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
 713                         fatal("route socket");
 714                         /*NOTREACHED*/
 715                 }
 716 #ifdef HAVE_POLL_H
 717                 set[1].fd = rtsock;
 718                 set[1].events = POLLIN;
 719 #else
 720                 if (rtsock > maxfd)
 721                         maxfd = rtsock;
 722 #endif
 723         } else {
 724 #ifdef HAVE_POLL_H
 725                 set[1].fd = -1;
 726 #else
 727                 rtsock = -1;    /*just for safety */
 728 #endif
 729         }
 730
 731 #ifndef HAVE_POLL_H
 732         fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask);
 733         if ((sockvecp = malloc(fdmasks)) == NULL) {
 734                 fatal("malloc");
 735                 /*NOTREACHED*/
 736         }
 737         if ((recvecp = malloc(fdmasks)) == NULL) {
 738                 fatal("malloc");
 739                 /*NOTREACHED*/
 740         }
 741         memset(sockvecp, 0, fdmasks);
 742         FD_SET(ripsock, sockvecp);
 743         if (rtsock >= 0)
 744                 FD_SET(rtsock, sockvecp);
 745 #endif
 746 }
 747
 748 #define RIPSIZE(n) \
 749         (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6))
 750
 751 /*
 752  * ripflush flushes the rip datagram stored in the rip buffer
 753  */
 754 void
 755 ripflush(struct ifc *ifcp, struct sockaddr_in6 *sin6, int nrt, struct netinfo6 *np)
 756 {
 757         int i;
 758         int error;
 759
 760         if (ifcp)
 761                 tracet(1, "Send(%s): info(%d) to %s.%d\n",
 762                         ifcp->ifc_name, nrt,
 763                         inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port));
 764         else
 765                 tracet(1, "Send: info(%d) to %s.%d\n",
 766                         nrt, inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port));
 767         if (dflag >= 2) {
 768                 np = ripbuf->rip6_nets;
 769                 for (i = 0; i < nrt; i++, np++) {
 770                         if (np->rip6_metric == NEXTHOP_METRIC) {
 771                                 if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest))
 772                                         trace(2, "    NextHop reset");
 773                                 else {
 774                                         trace(2, "    NextHop %s",
 775                                                 inet6_n2p(&np->rip6_dest));
 776                                 }
 777                         } else {
 778                                 trace(2, "    %s/%d[%d]",
 779                                         inet6_n2p(&np->rip6_dest),
 780                                         np->rip6_plen, np->rip6_metric);
 781                         }
 782                         if (np->rip6_tag) {
 783                                 trace(2, "  tag=0x%04x",
 784                                         ntohs(np->rip6_tag) & 0xffff);
 785                         }
 786                         trace(2, "\n");
 787                 }
 788         }
 789         error = sendpacket(sin6, RIPSIZE(nrt));
 790         if (error == EAFNOSUPPORT) {
 791                 /* Protocol not supported */
 792                 tracet(1, "Could not send info to %s (%s): "
 793                         "set IFF_UP to 0\n",
 794                         ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
 795                 ifcp->ifc_flags &= ~IFF_UP;     /* As if down for AF_INET6 */
 796         }
 797 }
 798
 799 /*
 800  * Generate RIP6_RESPONSE packets and send them.
 801  */
 802 void
 803 ripsend(struct  ifc *ifcp, struct sockaddr_in6 *sin6, int flag)
 804 {
 805         struct  riprt *rrt;
 806         struct  in6_addr *nh;   /* next hop */
 807         struct netinfo6 *np;
 808         int     maxrte;
 809         int nrt;
 810
 811         if (qflag)
 812                 return;
 813
 814         if (ifcp == NULL) {
 815                 /*
 816                  * Request from non-link local address is not
 817                  * a regular route6d update.
 818                  */
 819                 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) -
 820                                 sizeof(struct udphdr) -
 821                                 sizeof(struct rip6) + sizeof(struct netinfo6)) /
 822                                 sizeof(struct netinfo6);
 823                 nh = NULL;
 824                 nrt = 0;
 825                 np = ripbuf->rip6_nets;
 826                 TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
 827                         if (rrt->rrt_rflags & RRTF_NOADVERTISE)
 828                                 continue;
 829                         /* Put the route to the buffer */
 830                         *np = rrt->rrt_info;
 831                         np++; nrt++;
 832                         if (nrt == maxrte) {
 833                                 ripflush(NULL, sin6, nrt, np);
 834                                 nh = NULL;
 835                                 nrt = 0;
 836                                 np = ripbuf->rip6_nets;
 837                         }
 838                 }
 839                 if (nrt)        /* Send last packet */
 840                         ripflush(NULL, sin6, nrt, np);
 841                 return;
 842         }
 843
 844         if ((flag & RRTF_SENDANYWAY) == 0 &&
 845             (qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
 846                 return;
 847
 848         /* -N: no use */
 849         if (iff_find(ifcp, IFIL_TYPE_N) != NULL)
 850                 return;
 851
 852         /* -T: generate default route only */
 853         if (iff_find(ifcp, IFIL_TYPE_T) != NULL) {
 854                 struct netinfo6 rrt_info;
 855                 memset(&rrt_info, 0, sizeof(struct netinfo6));
 856                 rrt_info.rip6_dest = in6addr_any;
 857                 rrt_info.rip6_plen = 0;
 858                 rrt_info.rip6_metric = 1;
 859                 rrt_info.rip6_metric += ifcp->ifc_metric;
 860                 rrt_info.rip6_tag = htons(routetag & 0xffff);
 861                 np = ripbuf->rip6_nets;
 862                 *np = rrt_info;
 863                 nrt = 1;
 864                 ripflush(ifcp, sin6, nrt, np);
 865                 return;
 866         }
 867
 868         maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) -
 869                         sizeof(struct udphdr) -
 870                         sizeof(struct rip6) + sizeof(struct netinfo6)) /
 871                         sizeof(struct netinfo6);
 872
 873         nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
 874         TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
 875                 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
 876                         continue;
 877
 878                 /* Need to check filter here */
 879                 if (out_filter(rrt, ifcp) == 0)
 880                         continue;
 881
 882                 /* Check split horizon and other conditions */
 883                 if (tobeadv(rrt, ifcp) == 0)
 884                         continue;
 885
 886                 /* Only considers the routes with flag if specified */
 887                 if ((flag & RRTF_CHANGED) &&
 888                     (rrt->rrt_rflags & RRTF_CHANGED) == 0)
 889                         continue;
 890
 891                 /* Check nexthop */
 892                 if (rrt->rrt_index == ifcp->ifc_index &&
 893                     !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) &&
 894                     (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) {
 895                         if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) {
 896                                 if (nrt == maxrte - 2) {
 897                                         ripflush(ifcp, sin6, nrt, np);
 898                                         nh = NULL;
 899                                         nrt = 0;
 900                                         np = ripbuf->rip6_nets;
 901                                 }
 902
 903                                 np->rip6_dest = rrt->rrt_gw;
 904                                 np->rip6_plen = 0;
 905                                 np->rip6_tag = 0;
 906                                 np->rip6_metric = NEXTHOP_METRIC;
 907                                 nh = &rrt->rrt_gw;
 908                                 np++; nrt++;
 909                         }
 910                 } else if (nh && (rrt->rrt_index != ifcp->ifc_index ||
 911                                   !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) ||
 912                                   rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) {
 913                         /* Reset nexthop */
 914                         if (nrt == maxrte - 2) {
 915                                 ripflush(ifcp, sin6, nrt, np);
 916                                 nh = NULL;
 917                                 nrt = 0;
 918                                 np = ripbuf->rip6_nets;
 919                         }
 920                         memset(np, 0, sizeof(struct netinfo6));
 921                         np->rip6_metric = NEXTHOP_METRIC;
 922                         nh = NULL;
 923                         np++; nrt++;
 924                 }
 925
 926                 /* Put the route to the buffer */
 927                 *np = rrt->rrt_info;
 928                 np++; nrt++;
 929                 if (nrt == maxrte) {
 930                         ripflush(ifcp, sin6, nrt, np);
 931                         nh = NULL;
 932                         nrt = 0;
 933                         np = ripbuf->rip6_nets;
 934                 }
 935         }
 936         if (nrt)        /* Send last packet */
 937                 ripflush(ifcp, sin6, nrt, np);
 938 }
 939
 940 /*
 941  * outbound filter logic, per-route/interface.
 942  */
 943 int
 944 out_filter(struct riprt *rrt, struct ifc *ifcp)
 945 {
 946         struct iff *iffp;
 947         struct in6_addr ia;
 948         int ok;
 949
 950         /*
 951          * -A: filter out less specific routes, if we have aggregated
 952          * route configured.
 953          */
 954         TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) {
 955                 if (iffp->iff_type != 'A')
 956                         continue;
 957                 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen)
 958                         continue;
 959                 ia = rrt->rrt_info.rip6_dest;
 960                 applyplen(&ia, iffp->iff_plen);
 961                 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr))
 962                         return 0;
 963         }
 964
 965         /*
 966          * if it is an aggregated route, advertise it only to the
 967          * interfaces specified on -A.
 968          */
 969         if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) {
 970                 ok = 0;
 971                 TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) {
 972                         if (iffp->iff_type != 'A')
 973                                 continue;
 974                         if (rrt->rrt_info.rip6_plen == iffp->iff_plen &&
 975                             IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
 976                             &iffp->iff_addr)) {
 977                                 ok = 1;
 978                                 break;
 979                         }
 980                 }
 981                 if (!ok)
 982                         return 0;
 983         }
 984
 985         /*
 986          * -O: advertise only if prefix matches the configured prefix.
 987          */
 988         if (iff_find(ifcp, IFIL_TYPE_O) != NULL) {
 989                 ok = 0;
 990                 TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) {
 991                         if (iffp->iff_type != 'O')
 992                                 continue;
 993                         if (rrt->rrt_info.rip6_plen < iffp->iff_plen)
 994                                 continue;
 995                         ia = rrt->rrt_info.rip6_dest;
 996                         applyplen(&ia, iffp->iff_plen);
 997                         if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
 998                                 ok = 1;
 999                                 break;
1000                         }
1001                 }
1002                 if (!ok)
1003                         return 0;
1004         }
1005
1006         /* the prefix should be advertised */
1007         return 1;
1008 }
1009
1010 /*
1011  * Determine if the route is to be advertised on the specified interface.
1012  * It checks options specified in the arguments and the split horizon rule.
1013  */
1014 int
1015 tobeadv(struct riprt *rrt, struct ifc *ifcp)
1016 {
1017
1018         /* Special care for static routes */
1019         if (rrt->rrt_flags & RTF_STATIC) {
1020                 /* XXX don't advertise reject/blackhole routes */
1021                 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE))
1022                         return 0;
1023
1024                 if (Sflag)      /* Yes, advertise it anyway */
1025                         return 1;
1026                 if (sflag && rrt->rrt_index != ifcp->ifc_index)
1027                         return 1;
1028                 return 0;
1029         }
1030         /* Regular split horizon */
1031         if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index)
1032                 return 0;
1033         return 1;
1034 }
1035
1036 /*
1037  * Send a rip packet actually.
1038  */
1039 int
1040 sendpacket(struct sockaddr_in6 *sin6, int len)
1041 {
1042         struct msghdr m;
1043         struct cmsghdr *cm;
1044         struct iovec iov[2];
1045         u_char cmsgbuf[256];
1046         struct in6_pktinfo *pi;
1047         int idx;
1048         struct sockaddr_in6 sincopy;
1049
1050         /* do not overwrite the given sin */
1051         sincopy = *sin6;
1052         sin6 = &sincopy;
1053
1054         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
1055             IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1056                 idx = sin6->sin6_scope_id;
1057         else
1058                 idx = 0;
1059
1060         m.msg_name = (caddr_t)sin6;
1061         m.msg_namelen = sizeof(*sin6);
1062         iov[0].iov_base = (caddr_t)ripbuf;
1063         iov[0].iov_len = len;
1064         m.msg_iov = iov;
1065         m.msg_iovlen = 1;
1066         m.msg_flags = 0;
1067         if (!idx) {
1068                 m.msg_control = NULL;
1069                 m.msg_controllen = 0;
1070         } else {
1071                 memset(cmsgbuf, 0, sizeof(cmsgbuf));
1072                 cm = (struct cmsghdr *)cmsgbuf;
1073                 m.msg_control = (caddr_t)cm;
1074                 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
1075
1076                 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1077                 cm->cmsg_level = IPPROTO_IPV6;
1078                 cm->cmsg_type = IPV6_PKTINFO;
1079                 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
1080                 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/
1081                 pi->ipi6_ifindex = idx;
1082         }
1083
1084         if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) {
1085                 trace(1, "sendmsg: %s\n", strerror(errno));
1086                 return errno;
1087         }
1088
1089         return 0;
1090 }
1091
1092 /*
1093  * Receive and process RIP packets.  Update the routes/kernel forwarding
1094  * table if necessary.
1095  */
1096 void
1097 riprecv(void)
1098 {
1099         struct  ifc *ifcp, *ic;
1100         struct  sockaddr_in6 fsock;
1101         struct  in6_addr nh;    /* next hop */
1102         struct  rip6 *rp;
1103         struct  netinfo6 *np, *nq;
1104         struct  riprt *rrt;
1105         ssize_t len, nn;
1106         unsigned int need_trigger, idx;
1107         char    buf[4 * RIP6_MAXMTU];
1108         time_t  t;
1109         struct msghdr m;
1110         struct cmsghdr *cm;
1111         struct iovec iov[2];
1112         u_char cmsgbuf[256];
1113         struct in6_pktinfo *pi = NULL;
1114         int *hlimp = NULL;
1115         struct iff *iffp;
1116         struct in6_addr ia;
1117         int ok;
1118         time_t t_half_lifetime;
1119
1120         need_trigger = 0;
1121
1122         m.msg_name = (caddr_t)&fsock;
1123         m.msg_namelen = sizeof(fsock);
1124         iov[0].iov_base = (caddr_t)buf;
1125         iov[0].iov_len = sizeof(buf);
1126         m.msg_iov = iov;
1127         m.msg_iovlen = 1;
1128         cm = (struct cmsghdr *)cmsgbuf;
1129         m.msg_control = (caddr_t)cm;
1130         m.msg_controllen = sizeof(cmsgbuf);
1131         m.msg_flags = 0;
1132         if ((len = recvmsg(ripsock, &m, 0)) < 0) {
1133                 fatal("recvmsg");
1134                 /*NOTREACHED*/
1135         }
1136         idx = 0;
1137         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
1138              cm;
1139              cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
1140                 if (cm->cmsg_level != IPPROTO_IPV6)
1141                     continue;
1142                 switch (cm->cmsg_type) {
1143                 case IPV6_PKTINFO:
1144                         if (cm->cmsg_len != CMSG_LEN(sizeof(*pi))) {
1145                                 trace(1,
1146                                     "invalid cmsg length for IPV6_PKTINFO\n");
1147                                 return;
1148                         }
1149                         pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
1150                         idx = pi->ipi6_ifindex;
1151                         break;
1152                 case IPV6_HOPLIMIT:
1153                         if (cm->cmsg_len != CMSG_LEN(sizeof(int))) {
1154                                 trace(1,
1155                                     "invalid cmsg length for IPV6_HOPLIMIT\n");
1156                                 return;
1157                         }
1158                         hlimp = (int *)CMSG_DATA(cm);
1159                         break;
1160                 }
1161         }
1162
1163         if ((size_t)len < sizeof(struct rip6)) {
1164                 trace(1, "Packet too short\n");
1165                 return;
1166         }
1167
1168         if (pi == NULL || hlimp == NULL) {
1169                 /*
1170                  * This can happen when the kernel failed to allocate memory
1171                  * for the ancillary data.  Although we might be able to handle
1172                  * some cases without this info, those are minor and not so
1173                  * important, so it's better to discard the packet for safer
1174                  * operation.
1175                  */
1176                 trace(1, "IPv6 packet information cannot be retrieved\n");
1177                 return;
1178         }
1179
1180         nh = fsock.sin6_addr;
1181         nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) /
1182                 sizeof(struct netinfo6);
1183         rp = (struct rip6 *)buf;
1184         np = rp->rip6_nets;
1185
1186         if (rp->rip6_vers != RIP6_VERSION) {
1187                 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers);
1188                 return;
1189         }
1190         if (rp->rip6_cmd == RIP6_REQUEST) {
1191                 if (idx && idx < nindex2ifc) {
1192                         ifcp = index2ifc[idx];
1193                         riprequest(ifcp, np, nn, &fsock);
1194                 } else {
1195                         riprequest(NULL, np, nn, &fsock);
1196                 }
1197                 return;
1198         }
1199
1200         if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) {
1201                 trace(1, "Response from non-ll addr: %s\n",
1202                     inet6_n2p(&fsock.sin6_addr));
1203                 return;         /* Ignore packets from non-link-local addr */
1204         }
1205         if (ntohs(fsock.sin6_port) != RIP6_PORT) {
1206                 trace(1, "Response from non-rip port from %s\n",
1207                     inet6_n2p(&fsock.sin6_addr));
1208                 return;
1209         }
1210         if (IN6_IS_ADDR_MULTICAST(&pi->ipi6_addr) && *hlimp != 255) {
1211                 trace(1,
1212                     "Response packet with a smaller hop limit (%d) from %s\n",
1213                     *hlimp, inet6_n2p(&fsock.sin6_addr));
1214                 return;
1215         }
1216         /*
1217          * Further validation: since this program does not send off-link
1218          * requests, an incoming response must always come from an on-link
1219          * node.  Although this is normally ensured by the source address
1220          * check above, it may not 100% be safe because there are router
1221          * implementations that (invalidly) allow a packet with a link-local
1222          * source address to be forwarded to a different link.
1223          * So we also check whether the destination address is a link-local
1224          * address or the hop limit is 255.  Note that RFC2080 does not require
1225          * the specific hop limit for a unicast response, so we cannot assume
1226          * the limitation.
1227          */
1228         if (!IN6_IS_ADDR_LINKLOCAL(&pi->ipi6_addr) && *hlimp != 255) {
1229                 trace(1,
1230                     "Response packet possibly from an off-link node: "
1231                     "from %s to %s hlim=%d\n",
1232                     inet6_n2p(&fsock.sin6_addr),
1233                     inet6_n2p(&pi->ipi6_addr), *hlimp);
1234                 return;
1235         }
1236
1237         idx = fsock.sin6_scope_id;
1238         ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL;
1239         if (!ifcp) {
1240                 trace(1, "Packets to unknown interface index %d\n", idx);
1241                 return;         /* Ignore it */
1242         }
1243         if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr))
1244                 return;         /* The packet is from me; ignore */
1245         if (rp->rip6_cmd != RIP6_RESPONSE) {
1246                 trace(1, "Invalid command %d\n", rp->rip6_cmd);
1247                 return;
1248         }
1249
1250         /* -N: no use */
1251         if (iff_find(ifcp, IFIL_TYPE_N) != NULL)
1252                 return;
1253
1254         tracet(1, "Recv(%s): from %s.%d info(%zd)\n",
1255             ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn);
1256
1257         t = time(NULL);
1258         t_half_lifetime = t - (RIP_LIFETIME/2);
1259         for (; nn; nn--, np++) {
1260                 if (np->rip6_metric == NEXTHOP_METRIC) {
1261                         /* modify neighbor address */
1262                         if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1263                                 nh = np->rip6_dest;
1264                                 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1265                         } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) {
1266                                 nh = fsock.sin6_addr;
1267                                 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1268                         } else {
1269                                 nh = fsock.sin6_addr;
1270                                 trace(1, "\tInvalid Nexthop: %s\n",
1271                                     inet6_n2p(&np->rip6_dest));
1272                         }
1273                         continue;
1274                 }
1275                 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) {
1276                         trace(1, "\tMulticast netinfo6: %s/%d [%d]\n",
1277                                 inet6_n2p(&np->rip6_dest),
1278                                 np->rip6_plen, np->rip6_metric);
1279                         continue;
1280                 }
1281                 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) {
1282                         trace(1, "\tLoopback netinfo6: %s/%d [%d]\n",
1283                                 inet6_n2p(&np->rip6_dest),
1284                                 np->rip6_plen, np->rip6_metric);
1285                         continue;
1286                 }
1287                 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1288                         trace(1, "\tLink Local netinfo6: %s/%d [%d]\n",
1289                                 inet6_n2p(&np->rip6_dest),
1290                                 np->rip6_plen, np->rip6_metric);
1291                         continue;
1292                 }
1293                 /* may need to pass sitelocal prefix in some case, however*/
1294                 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) {
1295                         trace(1, "\tSite Local netinfo6: %s/%d [%d]\n",
1296                                 inet6_n2p(&np->rip6_dest),
1297                                 np->rip6_plen, np->rip6_metric);
1298                         continue;
1299                 }
1300                 trace(2, "\tnetinfo6: %s/%d [%d]",
1301                         inet6_n2p(&np->rip6_dest),
1302                         np->rip6_plen, np->rip6_metric);
1303                 if (np->rip6_tag)
1304                         trace(2, "  tag=0x%04x", ntohs(np->rip6_tag) & 0xffff);
1305                 if (dflag >= 2) {
1306                         ia = np->rip6_dest;
1307                         applyplen(&ia, np->rip6_plen);
1308                         if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest))
1309                                 trace(2, " [junk outside prefix]");
1310                 }
1311
1312                 /*
1313                  * -L: listen only if the prefix matches the configuration
1314                  */
1315                 ok = 1; /* if there's no L filter, it is ok */
1316                 TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) {
1317                         if (iffp->iff_type != IFIL_TYPE_L)
1318                                 continue;
1319                         ok = 0;
1320                         if (np->rip6_plen < iffp->iff_plen)
1321                                 continue;
1322                         /* special rule: ::/0 means default, not "in /0" */
1323                         if (iffp->iff_plen == 0 && np->rip6_plen > 0)
1324                                 continue;
1325                         ia = np->rip6_dest;
1326                         applyplen(&ia, iffp->iff_plen);
1327                         if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
1328                                 ok = 1;
1329                                 break;
1330                         }
1331                 }
1332                 if (!ok) {
1333                         trace(2, "  (filtered)\n");
1334                         continue;
1335                 }
1336
1337                 trace(2, "\n");
1338                 np->rip6_metric++;
1339                 np->rip6_metric += ifcp->ifc_metric;
1340                 if (np->rip6_metric > HOPCNT_INFINITY6)
1341                         np->rip6_metric = HOPCNT_INFINITY6;
1342
1343                 applyplen(&np->rip6_dest, np->rip6_plen);
1344                 if ((rrt = rtsearch(np)) != NULL) {
1345                         if (rrt->rrt_t == 0)
1346                                 continue;       /* Intf route has priority */
1347                         nq = &rrt->rrt_info;
1348                         if (nq->rip6_metric > np->rip6_metric) {
1349                                 if (rrt->rrt_index == ifcp->ifc_index &&
1350                                     IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1351                                         /* Small metric from the same gateway */
1352                                         nq->rip6_metric = np->rip6_metric;
1353                                 } else {
1354                                         /* Better route found */
1355                                         rrt->rrt_index = ifcp->ifc_index;
1356                                         /* Update routing table */
1357                                         delroute(nq, &rrt->rrt_gw);
1358                                         rrt->rrt_gw = nh;
1359                                         *nq = *np;
1360                                         addroute(rrt, &nh, ifcp);
1361                                 }
1362                                 rrt->rrt_rflags |= RRTF_CHANGED;
1363                                 rrt->rrt_t = t;
1364                                 need_trigger = 1;
1365                         } else if (nq->rip6_metric < np->rip6_metric &&
1366                                    rrt->rrt_index == ifcp->ifc_index &&
1367                                    IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1368                                 /* Got worse route from same gw */
1369                                 nq->rip6_metric = np->rip6_metric;
1370                                 rrt->rrt_t = t;
1371                                 rrt->rrt_rflags |= RRTF_CHANGED;
1372                                 need_trigger = 1;
1373                         } else if (nq->rip6_metric == np->rip6_metric &&
1374                                    np->rip6_metric < HOPCNT_INFINITY6) {
1375                                 if (rrt->rrt_index == ifcp->ifc_index &&
1376                                    IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1377                                         /* same metric, same route from same gw */
1378                                         rrt->rrt_t = t;
1379                                 } else if (rrt->rrt_t < t_half_lifetime) {
1380                                         /* Better route found */
1381                                         rrt->rrt_index = ifcp->ifc_index;
1382                                         /* Update routing table */
1383                                         delroute(nq, &rrt->rrt_gw);
1384                                         rrt->rrt_gw = nh;
1385                                         *nq = *np;
1386                                         addroute(rrt, &nh, ifcp);
1387                                         rrt->rrt_rflags |= RRTF_CHANGED;
1388                                         rrt->rrt_t = t;
1389                                 }
1390                         }
1391                         /*
1392                          * if nq->rip6_metric == HOPCNT_INFINITY6 then
1393                          * do not update age value.  Do nothing.
1394                          */
1395                 } else if (np->rip6_metric < HOPCNT_INFINITY6) {
1396                         /* Got a new valid route */
1397                         if ((rrt = MALLOC(struct riprt)) == NULL) {
1398                                 fatal("malloc: struct riprt");
1399                                 /*NOTREACHED*/
1400                         }
1401                         memset(rrt, 0, sizeof(*rrt));
1402                         nq = &rrt->rrt_info;
1403
1404                         rrt->rrt_same = NULL;
1405                         rrt->rrt_index = ifcp->ifc_index;
1406                         rrt->rrt_flags = RTF_UP|RTF_GATEWAY;
1407                         rrt->rrt_gw = nh;
1408                         *nq = *np;
1409                         applyplen(&nq->rip6_dest, nq->rip6_plen);
1410                         if (nq->rip6_plen == sizeof(struct in6_addr) * 8)
1411                                 rrt->rrt_flags |= RTF_HOST;
1412
1413                         /* Update routing table */
1414                         addroute(rrt, &nh, ifcp);
1415                         rrt->rrt_rflags |= RRTF_CHANGED;
1416                         need_trigger = 1;
1417                         rrt->rrt_t = t;
1418
1419                         /* Put the route to the list */
1420                         TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next);
1421                 }
1422         }
1423         /* XXX need to care the interval between triggered updates */
1424         if (need_trigger) {
1425                 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) {
1426                         TAILQ_FOREACH(ic, &ifc_head, ifc_next) {
1427                                 if (ifcp->ifc_index == ic->ifc_index)
1428                                         continue;
1429                                 if (ic->ifc_flags & IFF_UP)
1430                                         ripsend(ic, &ic->ifc_ripsin,
1431                                                 RRTF_CHANGED);
1432                         }
1433                 }
1434                 /* Reset the flag */
1435                 TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
1436                         rrt->rrt_rflags &= ~RRTF_CHANGED;
1437                 }
1438         }
1439 }
1440
1441 /*
1442  * Send all routes request packet to the specified interface.
1443  */
1444 void
1445 sendrequest(struct ifc *ifcp)
1446 {
1447         struct netinfo6 *np;
1448         int error;
1449
1450         if (ifcp->ifc_flags & IFF_LOOPBACK)
1451                 return;
1452         ripbuf->rip6_cmd = RIP6_REQUEST;
1453         np = ripbuf->rip6_nets;
1454         memset(np, 0, sizeof(struct netinfo6));
1455         np->rip6_metric = HOPCNT_INFINITY6;
1456         tracet(1, "Send rtdump Request to %s (%s)\n",
1457                 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1458         error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
1459         if (error == EAFNOSUPPORT) {
1460                 /* Protocol not supported */
1461                 tracet(1, "Could not send rtdump Request to %s (%s): "
1462                         "set IFF_UP to 0\n",
1463                         ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1464                 ifcp->ifc_flags &= ~IFF_UP;     /* As if down for AF_INET6 */
1465         }
1466         ripbuf->rip6_cmd = RIP6_RESPONSE;
1467 }
1468
1469 /*
1470  * Process a RIP6_REQUEST packet.
1471  */
1472 void
1473 riprequest(struct ifc *ifcp,
1474         struct netinfo6 *np,
1475         int nn,
1476         struct sockaddr_in6 *sin6)
1477 {
1478         int i;
1479         struct riprt *rrt;
1480
1481         if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) &&
1482               np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) {
1483                 /* Specific response, don't split-horizon */
1484                 trace(1, "\tRIP Request\n");
1485                 for (i = 0; i < nn; i++, np++) {
1486                         rrt = rtsearch(np);
1487                         if (rrt)
1488                                 np->rip6_metric = rrt->rrt_info.rip6_metric;
1489                         else
1490                                 np->rip6_metric = HOPCNT_INFINITY6;
1491                 }
1492                 (void)sendpacket(sin6, RIPSIZE(nn));
1493                 return;
1494         }
1495         /* Whole routing table dump */
1496         trace(1, "\tRIP Request -- whole routing table\n");
1497         ripsend(ifcp, sin6, RRTF_SENDANYWAY);
1498 }
1499
1500 /*
1501  * Get information of each interface.
1502  */
1503 void
1504 ifconfig(void)
1505 {
1506         struct ifaddrs *ifap, *ifa;
1507         struct ifc *ifcp;
1508         struct ipv6_mreq mreq;
1509         int s;
1510
1511         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
1512                 fatal("socket");
1513                 /*NOTREACHED*/
1514         }
1515
1516         if (getifaddrs(&ifap) != 0) {
1517                 fatal("getifaddrs");
1518                 /*NOTREACHED*/
1519         }
1520
1521         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1522                 if (ifa->ifa_addr->sa_family != AF_INET6)
1523                         continue;
1524                 ifcp = ifc_find(ifa->ifa_name);
1525                 /* we are interested in multicast-capable interfaces */
1526                 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
1527                         continue;
1528                 if (!ifcp) {
1529                         /* new interface */
1530                         if ((ifcp = MALLOC(struct ifc)) == NULL) {
1531                                 fatal("malloc: struct ifc");
1532                                 /*NOTREACHED*/
1533                         }
1534                         memset(ifcp, 0, sizeof(*ifcp));
1535
1536                         ifcp->ifc_index = -1;
1537                         strlcpy(ifcp->ifc_name, ifa->ifa_name,
1538                             sizeof(ifcp->ifc_name));
1539                         TAILQ_INIT(&ifcp->ifc_ifac_head);
1540                         TAILQ_INIT(&ifcp->ifc_iff_head);
1541                         ifcp->ifc_flags = ifa->ifa_flags;
1542                         TAILQ_INSERT_HEAD(&ifc_head, ifcp, ifc_next);
1543                         trace(1, "newif %s <%s>\n", ifcp->ifc_name,
1544                                 ifflags(ifcp->ifc_flags));
1545                         if (!strcmp(ifcp->ifc_name, LOOPBACK_IF))
1546                                 loopifcp = ifcp;
1547                 } else {
1548                         /* update flag, this may be up again */
1549                         if (ifcp->ifc_flags != ifa->ifa_flags) {
1550                                 trace(1, "%s: <%s> -> ", ifcp->ifc_name,
1551                                         ifflags(ifcp->ifc_flags));
1552                                 trace(1, "<%s>\n", ifflags(ifa->ifa_flags));
1553                                 ifcp->ifc_cflags |= IFC_CHANGED;
1554                         }
1555                         ifcp->ifc_flags = ifa->ifa_flags;
1556                 }
1557                 if (ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s) < 0) {
1558                         /* maybe temporary failure */
1559                         continue;
1560                 }
1561                 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP
1562                  && 0 < ifcp->ifc_index && !ifcp->ifc_joined) {
1563                         mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr;
1564                         mreq.ipv6mr_interface = ifcp->ifc_index;
1565                         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1566                             &mreq, sizeof(mreq)) < 0) {
1567                                 fatal("IPV6_JOIN_GROUP");
1568                                 /*NOTREACHED*/
1569                         }
1570                         trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST);
1571                         ifcp->ifc_joined++;
1572                 }
1573         }
1574         close(s);
1575         freeifaddrs(ifap);
1576 }
1577
1578 int
1579 ifconfig1(const char *name,
1580         const struct sockaddr *sa,
1581         struct ifc *ifcp,
1582         int s)
1583 {
1584         struct  in6_ifreq ifr;
1585         const struct sockaddr_in6 *sin6;
1586         struct  ifac *ifac;
1587         int     plen;
1588         char    buf[BUFSIZ];
1589
1590         sin6 = (const struct sockaddr_in6 *)sa;
1591         if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) && !lflag)
1592                 return (-1);
1593         ifr.ifr_addr = *sin6;
1594         strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1595         if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) {
1596                 syslog(LOG_INFO, "ioctl: SIOCGIFNETMASK_IN6");
1597                 return (-1);
1598         }
1599         plen = sin6mask2len(&ifr.ifr_addr);
1600         if ((ifac = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) {
1601                 /* same interface found */
1602                 /* need check if something changed */
1603                 /* XXX not yet implemented */
1604                 return (-1);
1605         }
1606         /*
1607          * New address is found
1608          */
1609         if ((ifac = MALLOC(struct ifac)) == NULL) {
1610                 fatal("malloc: struct ifac");
1611                 /*NOTREACHED*/
1612         }
1613         memset(ifac, 0, sizeof(*ifac));
1614
1615         ifac->ifac_ifc = ifcp;
1616         ifac->ifac_addr = sin6->sin6_addr;
1617         ifac->ifac_plen = plen;
1618         ifac->ifac_scope_id = sin6->sin6_scope_id;
1619         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1620                 ifr.ifr_addr = *sin6;
1621                 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) {
1622                         fatal("ioctl: SIOCGIFDSTADDR_IN6");
1623                         /*NOTREACHED*/
1624                 }
1625                 ifac->ifac_raddr = ifr.ifr_dstaddr.sin6_addr;
1626                 inet_ntop(AF_INET6, (void *)&ifac->ifac_raddr, buf,
1627                     sizeof(buf));
1628                 trace(1, "found address %s/%d -- %s\n",
1629                         inet6_n2p(&ifac->ifac_addr), ifac->ifac_plen, buf);
1630         } else {
1631                 trace(1, "found address %s/%d\n",
1632                         inet6_n2p(&ifac->ifac_addr), ifac->ifac_plen);
1633         }
1634         if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifac->ifac_addr)) {
1635                 ifcp->ifc_mylladdr = ifac->ifac_addr;
1636                 ifcp->ifc_index = ifac->ifac_scope_id;
1637                 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len);
1638                 ifcp->ifc_ripsin.sin6_scope_id = ifcp->ifc_index;
1639                 setindex2ifc(ifcp->ifc_index, ifcp);
1640                 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index);
1641                 if (ifcp->ifc_mtu > RIP6_MAXMTU)
1642                         ifcp->ifc_mtu = RIP6_MAXMTU;
1643                 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) {
1644                         fatal("ioctl: SIOCGIFMETRIC");
1645                         /*NOTREACHED*/
1646                 }
1647                 ifcp->ifc_metric = ifr.ifr_metric;
1648                 trace(1, "\tindex: %d, mtu: %d, metric: %d\n",
1649                         ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric);
1650         } else
1651                 ifcp->ifc_cflags |= IFC_CHANGED;
1652
1653         TAILQ_INSERT_HEAD(&ifcp->ifc_ifac_head, ifac, ifac_next);
1654
1655         return 0;
1656 }
1657
1658 void
1659 ifremove(int ifindex)
1660 {
1661         struct ifc *ifcp;
1662         struct riprt *rrt;
1663
1664         TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
1665                 if (ifcp->ifc_index == ifindex)
1666                         break;
1667         }
1668         if (ifcp == NULL)
1669                 return;
1670
1671         tracet(1, "ifremove: %s is departed.\n", ifcp->ifc_name);
1672         TAILQ_REMOVE(&ifc_head, ifcp, ifc_next);
1673
1674         TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
1675                 if (rrt->rrt_index == ifcp->ifc_index &&
1676                     rrt->rrt_rflags & RRTF_AGGREGATE)
1677                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
1678         }
1679         free(ifcp);
1680 }
1681
1682 /*
1683  * Receive and process routing messages.
1684  * Update interface information as necesssary.
1685  */
1686 void
1687 rtrecv(void)
1688 {
1689         char buf[BUFSIZ];
1690         char *p, *q = NULL;
1691         struct rt_msghdr *rtm;
1692         struct ifa_msghdr *ifam;
1693         struct if_msghdr *ifm;
1694         struct if_announcemsghdr *ifan;
1695         int len;
1696         struct ifc *ifcp, *ic;
1697         int iface = 0, rtable = 0;
1698         struct sockaddr_in6 *rta[RTAX_MAX];
1699         struct sockaddr_in6 mask;
1700         int i, addrs = 0;
1701         struct riprt *rrt;
1702
1703         if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
1704                 perror("read from rtsock");
1705                 exit(1);
1706         }
1707         if (len == 0)
1708                 return;
1709 #if 0
1710         if (len < sizeof(*rtm)) {
1711                 trace(1, "short read from rtsock: %d (should be > %lu)\n",
1712                         len, (u_long)sizeof(*rtm));
1713                 return;
1714         }
1715 #endif
1716         if (dflag >= 2) {
1717                 fprintf(stderr, "rtmsg:\n");
1718                 for (i = 0; i < len; i++) {
1719                         fprintf(stderr, "%02x ", buf[i] & 0xff);
1720                         if (i % 16 == 15) fprintf(stderr, "\n");
1721                 }
1722                 fprintf(stderr, "\n");
1723         }
1724
1725         for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) {
1726                 if (((struct rt_msghdr *)p)->rtm_version != RTM_VERSION)
1727                         continue;
1728
1729                 /* safety against bogus message */
1730                 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) {
1731                         trace(1, "bogus rtmsg: length=%d\n",
1732                                 ((struct rt_msghdr *)p)->rtm_msglen);
1733                         break;
1734                 }
1735                 rtm = NULL;
1736                 ifam = NULL;
1737                 ifm = NULL;
1738                 switch (((struct rt_msghdr *)p)->rtm_type) {
1739                 case RTM_NEWADDR:
1740                 case RTM_DELADDR:
1741                         ifam = (struct ifa_msghdr *)p;
1742                         addrs = ifam->ifam_addrs;
1743                         q = (char *)(ifam + 1);
1744                         break;
1745                 case RTM_IFINFO:
1746                         ifm = (struct if_msghdr *)p;
1747                         addrs = ifm->ifm_addrs;
1748                         q = (char *)(ifm + 1);
1749                         break;
1750                 case RTM_IFANNOUNCE:
1751                         ifan = (struct if_announcemsghdr *)p;
1752                         switch (ifan->ifan_what) {
1753                         case IFAN_ARRIVAL:
1754                                 iface++;
1755                                 break;
1756                         case IFAN_DEPARTURE:
1757                                 ifremove(ifan->ifan_index);
1758                                 iface++;
1759                                 break;
1760                         }
1761                         break;
1762                 default:
1763                         rtm = (struct rt_msghdr *)p;
1764                         addrs = rtm->rtm_addrs;
1765                         q = (char *)(rtm + 1);
1766                         if (rtm->rtm_version != RTM_VERSION) {
1767                                 trace(1, "unexpected rtmsg version %d "
1768                                         "(should be %d)\n",
1769                                         rtm->rtm_version, RTM_VERSION);
1770                                 continue;
1771                         }
1772                         if (rtm->rtm_pid == pid) {
1773 #if 0
1774                                 trace(1, "rtmsg looped back to me, ignored\n");
1775 #endif
1776                                 continue;
1777                         }
1778                         break;
1779                 }
1780                 memset(&rta, 0, sizeof(rta));
1781                 for (i = 0; i < RTAX_MAX; i++) {
1782                         if (addrs & (1 << i)) {
1783                                 rta[i] = (struct sockaddr_in6 *)q;
1784                                 q += ROUNDUP(rta[i]->sin6_len);
1785                         }
1786                 }
1787
1788                 trace(1, "rtsock: %s (addrs=%x)\n",
1789                         rttypes((struct rt_msghdr *)p), addrs);
1790                 if (dflag >= 2) {
1791                         for (i = 0;
1792                              i < ((struct rt_msghdr *)p)->rtm_msglen;
1793                              i++) {
1794                                 fprintf(stderr, "%02x ", p[i] & 0xff);
1795                                 if (i % 16 == 15) fprintf(stderr, "\n");
1796                         }
1797                         fprintf(stderr, "\n");
1798                 }
1799
1800                 /*
1801                  * Easy ones first.
1802                  *
1803                  * We may be able to optimize by using ifm->ifm_index or
1804                  * ifam->ifam_index.  For simplicity we don't do that here.
1805                  */
1806                 switch (((struct rt_msghdr *)p)->rtm_type) {
1807                 case RTM_NEWADDR:
1808                 case RTM_IFINFO:
1809                         iface++;
1810                         continue;
1811                 case RTM_ADD:
1812                         rtable++;
1813                         continue;
1814                 case RTM_LOSING:
1815                 case RTM_MISS:
1816                 case RTM_GET:
1817                 case RTM_LOCK:
1818                         /* nothing to be done here */
1819                         trace(1, "\tnothing to be done, ignored\n");
1820                         continue;
1821                 }
1822
1823 #if 0
1824                 if (rta[RTAX_DST] == NULL) {
1825                         trace(1, "\tno destination, ignored\n");
1826                         continue;
1827                 }
1828                 if (rta[RTAX_DST]->sin6_family != AF_INET6) {
1829                         trace(1, "\taf mismatch, ignored\n");
1830                         continue;
1831                 }
1832                 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) {
1833                         trace(1, "\tlinklocal destination, ignored\n");
1834                         continue;
1835                 }
1836                 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) {
1837                         trace(1, "\tloopback destination, ignored\n");
1838                         continue;               /* Loopback */
1839                 }
1840                 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) {
1841                         trace(1, "\tmulticast destination, ignored\n");
1842                         continue;
1843                 }
1844 #endif
1845
1846                 /* hard ones */
1847                 switch (((struct rt_msghdr *)p)->rtm_type) {
1848                 case RTM_NEWADDR:
1849                 case RTM_IFINFO:
1850                 case RTM_ADD:
1851                 case RTM_LOSING:
1852                 case RTM_MISS:
1853                 case RTM_GET:
1854                 case RTM_LOCK:
1855                         /* should already be handled */
1856                         fatal("rtrecv: never reach here");
1857                         /*NOTREACHED*/
1858                 case RTM_DELETE:
1859                         if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) {
1860                                 trace(1, "\tsome of dst/gw/netamsk are "
1861                                     "unavailable, ignored\n");
1862                                 break;
1863                         }
1864                         if ((rtm->rtm_flags & RTF_HOST) != 0) {
1865                                 mask.sin6_len = sizeof(mask);
1866                                 memset(&mask.sin6_addr, 0xff,
1867                                     sizeof(mask.sin6_addr));
1868                                 rta[RTAX_NETMASK] = &mask;
1869                         } else if (!rta[RTAX_NETMASK]) {
1870                                 trace(1, "\tsome of dst/gw/netamsk are "
1871                                     "unavailable, ignored\n");
1872                                 break;
1873                         }
1874                         if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY],
1875                             rta[RTAX_NETMASK]) == 0) {
1876                                 rtable++;       /*just to be sure*/
1877                         }
1878                         break;
1879                 case RTM_CHANGE:
1880                 case RTM_REDIRECT:
1881                         trace(1, "\tnot supported yet, ignored\n");
1882                         break;
1883                 case RTM_DELADDR:
1884                         if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) {
1885                                 trace(1, "\tno netmask or ifa given, ignored\n");
1886                                 break;
1887                         }
1888                         if (ifam->ifam_index < nindex2ifc)
1889                                 ifcp = index2ifc[ifam->ifam_index];
1890                         else
1891                                 ifcp = NULL;
1892                         if (!ifcp) {
1893                                 trace(1, "\tinvalid ifam_index %d, ignored\n",
1894                                         ifam->ifam_index);
1895                                 break;
1896                         }
1897                         if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK]))
1898                                 iface++;
1899                         break;
1900                 }
1901
1902         }
1903
1904         if (iface) {
1905                 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n");
1906                 ifconfig();
1907                 TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
1908                         if (ifcp->ifc_cflags & IFC_CHANGED) {
1909                                 if (ifrt(ifcp, 1)) {
1910                                         TAILQ_FOREACH(ic, &ifc_head, ifc_next) {
1911                                                 if (ifcp->ifc_index == ic->ifc_index)
1912                                                         continue;
1913                                                 if (ic->ifc_flags & IFF_UP)
1914                                                         ripsend(ic, &ic->ifc_ripsin,
1915                                                         RRTF_CHANGED);
1916                                         }
1917                                         /* Reset the flag */
1918                                         TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
1919                                                 rrt->rrt_rflags &= ~RRTF_CHANGED;
1920                                         }
1921                                 }
1922                                 ifcp->ifc_cflags &= ~IFC_CHANGED;
1923                         }
1924                 }
1925         }
1926         if (rtable) {
1927                 trace(1, "rtsock: read routing table again\n");
1928                 krtread(1);
1929         }
1930 }
1931
1932 /*
1933  * remove specified route from the internal routing table.
1934  */
1935 int
1936 rt_del(const struct sockaddr_in6 *sdst,
1937         const struct sockaddr_in6 *sgw,
1938         const struct sockaddr_in6 *smask)
1939 {
1940         const struct in6_addr *dst = NULL;
1941         const struct in6_addr *gw = NULL;
1942         int prefix;
1943         struct netinfo6 ni6;
1944         struct riprt *rrt = NULL;
1945         time_t t_lifetime;
1946
1947         if (sdst->sin6_family != AF_INET6) {
1948                 trace(1, "\tother AF, ignored\n");
1949                 return -1;
1950         }
1951         if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr)
1952          || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback)
1953          || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) {
1954                 trace(1, "\taddress %s not interesting, ignored\n",
1955                         inet6_n2p(&sdst->sin6_addr));
1956                 return -1;
1957         }
1958         dst = &sdst->sin6_addr;
1959         if (sgw->sin6_family == AF_INET6) {
1960                 /* easy case */
1961                 gw = &sgw->sin6_addr;
1962                 prefix = sin6mask2len(smask);
1963         } else if (sgw->sin6_family == AF_LINK) {
1964                 /*
1965                  * Interface route... a hard case.  We need to get the prefix
1966                  * length from the kernel, but we now are parsing rtmsg.
1967                  * We'll purge matching routes from my list, then get the
1968                  * fresh list.
1969                  */
1970                 struct riprt *longest;
1971                 trace(1, "\t%s is an interface route, guessing prefixlen\n",
1972                         inet6_n2p(dst));
1973                 longest = NULL;
1974                 TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
1975                         if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
1976                                         &sdst->sin6_addr)
1977                          && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
1978                                 if (!longest
1979                                  || longest->rrt_info.rip6_plen <
1980                                                  rrt->rrt_info.rip6_plen) {
1981                                         longest = rrt;
1982                                 }
1983                         }
1984                 }
1985                 rrt = longest;
1986                 if (!rrt) {
1987                         trace(1, "\tno matching interface route found\n");
1988                         return -1;
1989                 }
1990                 gw = &in6addr_loopback;
1991                 prefix = rrt->rrt_info.rip6_plen;
1992         } else {
1993                 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family);
1994                 return -1;
1995         }
1996
1997         trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix);
1998         trace(1, "gw %s\n", inet6_n2p(gw));
1999         t_lifetime = time(NULL) - RIP_LIFETIME;
2000         /* age route for interface address */
2001         memset(&ni6, 0, sizeof(ni6));
2002         ni6.rip6_dest = *dst;
2003         ni6.rip6_plen = prefix;
2004         applyplen(&ni6.rip6_dest, ni6.rip6_plen);       /*to be sure*/
2005         trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest),
2006                 ni6.rip6_plen);
2007         if (!rrt && (rrt = rtsearch(&ni6)) == NULL) {
2008                 trace(1, "\tno route found\n");
2009                 return -1;
2010         }
2011 #if 0
2012         if ((rrt->rrt_flags & RTF_STATIC) == 0) {
2013                 trace(1, "\tyou can delete static routes only\n");
2014         } else
2015 #endif
2016         if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) {
2017                 trace(1, "\tgw mismatch: %s <-> ",
2018                         inet6_n2p(&rrt->rrt_gw));
2019                 trace(1, "%s\n", inet6_n2p(gw));
2020         } else {
2021                 trace(1, "\troute found, age it\n");
2022                 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
2023                         rrt->rrt_t = t_lifetime;
2024                         rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
2025                 }
2026         }
2027         return 0;
2028 }
2029
2030 /*
2031  * remove specified address from internal interface/routing table.
2032  */
2033 int
2034 rt_deladdr(struct ifc *ifcp,
2035         const struct sockaddr_in6 *sifa,
2036         const struct sockaddr_in6 *smask)
2037 {
2038         const struct in6_addr *addr = NULL;
2039         int prefix;
2040         struct ifac *ifac = NULL;
2041         struct netinfo6 ni6;
2042         struct riprt *rrt = NULL;
2043         time_t t_lifetime;
2044         int updated = 0;
2045
2046         if (sifa->sin6_family != AF_INET6) {
2047                 trace(1, "\tother AF, ignored\n");
2048                 return -1;
2049         }
2050         addr = &sifa->sin6_addr;
2051         prefix = sin6mask2len(smask);
2052
2053         trace(1, "\tdeleting %s/%d from %s\n",
2054                 inet6_n2p(addr), prefix, ifcp->ifc_name);
2055         ifac = ifa_match(ifcp, addr, prefix);
2056         if (!ifac) {
2057                 trace(1, "\tno matching ifa found for %s/%d on %s\n",
2058                         inet6_n2p(addr), prefix, ifcp->ifc_name);
2059                 return -1;
2060         }
2061         if (ifac->ifac_ifc != ifcp) {
2062                 trace(1, "\taddress table corrupt: back pointer does not match "
2063                         "(%s != %s)\n",
2064                         ifcp->ifc_name, ifac->ifac_ifc->ifc_name);
2065                 return -1;
2066         }
2067         TAILQ_REMOVE(&ifcp->ifc_ifac_head, ifac, ifac_next);
2068         t_lifetime = time(NULL) - RIP_LIFETIME;
2069         /* age route for interface address */
2070         memset(&ni6, 0, sizeof(ni6));
2071         ni6.rip6_dest = ifac->ifac_addr;
2072         ni6.rip6_plen = ifac->ifac_plen;
2073         applyplen(&ni6.rip6_dest, ni6.rip6_plen);
2074         trace(1, "\tfind interface route %s/%d on %d\n",
2075                 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index);
2076         if ((rrt = rtsearch(&ni6)) != NULL) {
2077                 struct in6_addr none;
2078                 memset(&none, 0, sizeof(none));
2079                 if (rrt->rrt_index == ifcp->ifc_index &&
2080                     (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) ||
2081                      IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) {
2082                         trace(1, "\troute found, age it\n");
2083                         if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
2084                                 rrt->rrt_t = t_lifetime;
2085                                 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
2086                         }
2087                         updated++;
2088                 } else {
2089                         trace(1, "\tnon-interface route found: %s/%d on %d\n",
2090                                 inet6_n2p(&rrt->rrt_info.rip6_dest),
2091                                 rrt->rrt_info.rip6_plen,
2092                                 rrt->rrt_index);
2093                 }
2094         } else
2095                 trace(1, "\tno interface route found\n");
2096         /* age route for p2p destination */
2097         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
2098                 memset(&ni6, 0, sizeof(ni6));
2099                 ni6.rip6_dest = ifac->ifac_raddr;
2100                 ni6.rip6_plen = 128;
2101                 applyplen(&ni6.rip6_dest, ni6.rip6_plen);       /*to be sure*/
2102                 trace(1, "\tfind p2p route %s/%d on %d\n",
2103                         inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen,
2104                         ifcp->ifc_index);
2105                 if ((rrt = rtsearch(&ni6)) != NULL) {
2106                         if (rrt->rrt_index == ifcp->ifc_index &&
2107                             IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw,
2108                             &ifac->ifac_addr)) {
2109                                 trace(1, "\troute found, age it\n");
2110                                 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
2111                                         rrt->rrt_t = t_lifetime;
2112                                         rrt->rrt_info.rip6_metric =
2113                                             HOPCNT_INFINITY6;
2114                                         updated++;
2115                                 }
2116                         } else {
2117                                 trace(1, "\tnon-p2p route found: %s/%d on %d\n",
2118                                         inet6_n2p(&rrt->rrt_info.rip6_dest),
2119                                         rrt->rrt_info.rip6_plen,
2120                                         rrt->rrt_index);
2121                         }
2122                 } else
2123                         trace(1, "\tno p2p route found\n");
2124         }
2125         free(ifac);
2126
2127         return ((updated) ? 0 : -1);
2128 }
2129
2130 /*
2131  * Get each interface address and put those interface routes to the route
2132  * list.
2133  */
2134 int
2135 ifrt(struct ifc *ifcp, int again)
2136 {
2137         struct ifac *ifac;
2138         struct riprt *rrt = NULL, *search_rrt, *loop_rrt;
2139         struct netinfo6 *np;
2140         time_t t_lifetime;
2141         int need_trigger = 0;
2142
2143 #if 0
2144         if (ifcp->ifc_flags & IFF_LOOPBACK)
2145                 return 0;                       /* ignore loopback */
2146 #endif
2147
2148         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
2149                 ifrt_p2p(ifcp, again);
2150                 return 0;
2151         }
2152
2153         TAILQ_FOREACH(ifac, &ifcp->ifc_ifac_head, ifac_next) {
2154                 if (IN6_IS_ADDR_LINKLOCAL(&ifac->ifac_addr)) {
2155 #if 0
2156                         trace(1, "route: %s on %s: "
2157                             "skip linklocal interface address\n",
2158                             inet6_n2p(&ifac->ifac_addr), ifcp->ifc_name);
2159 #endif
2160                         continue;
2161                 }
2162                 if (IN6_IS_ADDR_UNSPECIFIED(&ifac->ifac_addr)) {
2163 #if 0
2164                         trace(1, "route: %s: skip unspec interface address\n",
2165                             ifcp->ifc_name);
2166 #endif
2167                         continue;
2168                 }
2169                 if (IN6_IS_ADDR_LOOPBACK(&ifac->ifac_addr)) {
2170 #if 0
2171                         trace(1, "route: %s: skip loopback address\n",
2172                             ifcp->ifc_name);
2173 #endif
2174                         continue;
2175                 }
2176                 if (ifcp->ifc_flags & IFF_UP) {
2177                         if ((rrt = MALLOC(struct riprt)) == NULL)
2178                                 fatal("malloc: struct riprt");
2179                         memset(rrt, 0, sizeof(*rrt));
2180                         rrt->rrt_same = NULL;
2181                         rrt->rrt_index = ifcp->ifc_index;
2182                         rrt->rrt_t = 0; /* don't age */
2183                         rrt->rrt_info.rip6_dest = ifac->ifac_addr;
2184                         rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2185                         rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
2186                         rrt->rrt_info.rip6_plen = ifac->ifac_plen;
2187                         rrt->rrt_flags = RTF_HOST;
2188                         rrt->rrt_rflags |= RRTF_CHANGED;
2189                         applyplen(&rrt->rrt_info.rip6_dest, ifac->ifac_plen);
2190                         memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2191                         rrt->rrt_gw = ifac->ifac_addr;
2192                         np = &rrt->rrt_info;
2193                         search_rrt = rtsearch(np);
2194                         if (search_rrt != NULL) {
2195                                 if (search_rrt->rrt_info.rip6_metric <=
2196                                     rrt->rrt_info.rip6_metric) {
2197                                         /* Already have better route */
2198                                         if (!again) {
2199                                                 trace(1, "route: %s/%d: "
2200                                                     "already registered (%s)\n",
2201                                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2202                                                     ifcp->ifc_name);
2203                                         }
2204                                         goto next;
2205                                 }
2206
2207                                 TAILQ_REMOVE(&riprt_head, rrt, rrt_next);
2208                                 delroute(&rrt->rrt_info, &rrt->rrt_gw);
2209                         }
2210                         /* Attach the route to the list */
2211                         trace(1, "route: %s/%d: register route (%s)\n",
2212                             inet6_n2p(&np->rip6_dest), np->rip6_plen,
2213                             ifcp->ifc_name);
2214                         TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next);
2215                         addroute(rrt, &rrt->rrt_gw, ifcp);
2216                         rrt = NULL;
2217                         sendrequest(ifcp);
2218                         ripsend(ifcp, &ifcp->ifc_ripsin, 0);
2219                         need_trigger = 1;
2220                 } else {
2221                         TAILQ_FOREACH(loop_rrt, &riprt_head, rrt_next) {
2222                                 if (loop_rrt->rrt_index == ifcp->ifc_index) {
2223                                         t_lifetime = time(NULL) - RIP_LIFETIME;
2224                                         if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) {
2225                                                 loop_rrt->rrt_t = t_lifetime;
2226                                                 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
2227                                                 loop_rrt->rrt_rflags |= RRTF_CHANGED;
2228                                                 need_trigger = 1;
2229                                         }
2230                                 }
2231                         }
2232                 }
2233         next:
2234                 if (rrt)
2235                         free(rrt);
2236         }
2237         return need_trigger;
2238 }
2239
2240 /*
2241  * there are couple of p2p interface routing models.  "behavior" lets
2242  * you pick one.  it looks that gated behavior fits best with BSDs,
2243  * since BSD kernels do not look at prefix length on p2p interfaces.
2244  */
2245 void
2246 ifrt_p2p(struct ifc *ifcp, int again)
2247 {
2248         struct ifac *ifac;
2249         struct riprt *rrt, *orrt;
2250         struct netinfo6 *np;
2251         struct in6_addr addr, dest;
2252         int advert, ignore, i;
2253 #define P2PADVERT_NETWORK       1
2254 #define P2PADVERT_ADDR          2
2255 #define P2PADVERT_DEST          4
2256 #define P2PADVERT_MAX           4
2257         const enum { CISCO, GATED, ROUTE6D } behavior = GATED;
2258         const char *category = "";
2259         const char *noadv;
2260
2261         TAILQ_FOREACH(ifac, &ifcp->ifc_ifac_head, ifac_next) {
2262                 addr = ifac->ifac_addr;
2263                 dest = ifac->ifac_raddr;
2264                 applyplen(&addr, ifac->ifac_plen);
2265                 applyplen(&dest, ifac->ifac_plen);
2266                 advert = ignore = 0;
2267                 switch (behavior) {
2268                 case CISCO:
2269                         /*
2270                          * honor addr/plen, just like normal shared medium
2271                          * interface.  this may cause trouble if you reuse
2272                          * addr/plen on other interfaces.
2273                          *
2274                          * advertise addr/plen.
2275                          */
2276                         advert |= P2PADVERT_NETWORK;
2277                         break;
2278                 case GATED:
2279                         /*
2280                          * prefixlen on p2p interface is meaningless.
2281                          * advertise addr/128 and dest/128.
2282                          *
2283                          * do not install network route to route6d routing
2284                          * table (if we do, it would prevent route installation
2285                          * for other p2p interface that shares addr/plen).
2286                          *
2287                          * XXX what should we do if dest is ::?  it will not
2288                          * get announced anyways (see following filter),
2289                          * but we need to think.
2290                          */
2291                         advert |= P2PADVERT_ADDR;
2292                         advert |= P2PADVERT_DEST;
2293                         ignore |= P2PADVERT_NETWORK;
2294                         break;
2295                 case ROUTE6D:
2296                         /*
2297                          * just for testing.  actually the code is redundant
2298                          * given the current p2p interface address assignment
2299                          * rule for kame kernel.
2300                          *
2301                          * intent:
2302                          *      A/n -> announce A/n
2303                          *      A B/n, A and B share prefix -> A/n (= B/n)
2304                          *      A B/n, do not share prefix -> A/128 and B/128
2305                          * actually, A/64 and A B/128 are the only cases
2306                          * permitted by the kernel:
2307                          *      A/64 -> A/64
2308                          *      A B/128 -> A/128 and B/128
2309                          */
2310                         if (!IN6_IS_ADDR_UNSPECIFIED(&ifac->ifac_raddr)) {
2311                                 if (IN6_ARE_ADDR_EQUAL(&addr, &dest))
2312                                         advert |= P2PADVERT_NETWORK;
2313                                 else {
2314                                         advert |= P2PADVERT_ADDR;
2315                                         advert |= P2PADVERT_DEST;
2316                                         ignore |= P2PADVERT_NETWORK;
2317                                 }
2318                         } else
2319                                 advert |= P2PADVERT_NETWORK;
2320                         break;
2321                 }
2322
2323                 for (i = 1; i <= P2PADVERT_MAX; i *= 2) {
2324                         if ((ignore & i) != 0)
2325                                 continue;
2326                         if ((rrt = MALLOC(struct riprt)) == NULL) {
2327                                 fatal("malloc: struct riprt");
2328                                 /*NOTREACHED*/
2329                         }
2330                         memset(rrt, 0, sizeof(*rrt));
2331                         rrt->rrt_same = NULL;
2332                         rrt->rrt_index = ifcp->ifc_index;
2333                         rrt->rrt_t = 0; /* don't age */
2334                         switch (i) {
2335                         case P2PADVERT_NETWORK:
2336                                 rrt->rrt_info.rip6_dest = ifac->ifac_addr;
2337                                 rrt->rrt_info.rip6_plen = ifac->ifac_plen;
2338                                 applyplen(&rrt->rrt_info.rip6_dest,
2339                                     ifac->ifac_plen);
2340                                 category = "network";
2341                                 break;
2342                         case P2PADVERT_ADDR:
2343                                 rrt->rrt_info.rip6_dest = ifac->ifac_addr;
2344                                 rrt->rrt_info.rip6_plen = 128;
2345                                 rrt->rrt_gw = in6addr_loopback;
2346                                 category = "addr";
2347                                 break;
2348                         case P2PADVERT_DEST:
2349                                 rrt->rrt_info.rip6_dest = ifac->ifac_raddr;
2350                                 rrt->rrt_info.rip6_plen = 128;
2351                                 rrt->rrt_gw = ifac->ifac_addr;
2352                                 category = "dest";
2353                                 break;
2354                         }
2355                         if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) ||
2356                             IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) {
2357 #if 0
2358                                 trace(1, "route: %s: skip unspec/linklocal "
2359                                     "(%s on %s)\n", category, ifcp->ifc_name);
2360 #endif
2361                                 free(rrt);
2362                                 continue;
2363                         }
2364                         if ((advert & i) == 0) {
2365                                 rrt->rrt_rflags |= RRTF_NOADVERTISE;
2366                                 noadv = ", NO-ADV";
2367                         } else
2368                                 noadv = "";
2369                         rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2370                         rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
2371                         np = &rrt->rrt_info;
2372                         orrt = rtsearch(np);
2373                         if (!orrt) {
2374                                 /* Attach the route to the list */
2375                                 trace(1, "route: %s/%d: register route "
2376                                     "(%s on %s%s)\n",
2377                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2378                                     category, ifcp->ifc_name, noadv);
2379                                 TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next);
2380                         } else if (rrt->rrt_index != orrt->rrt_index ||
2381                             rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) {
2382                                 /* replace route */
2383                                 TAILQ_INSERT_BEFORE(orrt, rrt, rrt_next);
2384                                 TAILQ_REMOVE(&riprt_head, orrt, rrt_next);
2385                                 free(orrt);
2386
2387                                 trace(1, "route: %s/%d: update (%s on %s%s)\n",
2388                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2389                                     category, ifcp->ifc_name, noadv);
2390                         } else {
2391                                 /* Already found */
2392                                 if (!again) {
2393                                         trace(1, "route: %s/%d: "
2394                                             "already registered (%s on %s%s)\n",
2395                                             inet6_n2p(&np->rip6_dest),
2396                                             np->rip6_plen, category,
2397                                             ifcp->ifc_name, noadv);
2398                                 }
2399                                 free(rrt);
2400                         }
2401                 }
2402         }
2403 #undef P2PADVERT_NETWORK
2404 #undef P2PADVERT_ADDR
2405 #undef P2PADVERT_DEST
2406 #undef P2PADVERT_MAX
2407 }
2408
2409 int
2410 getifmtu(int ifindex)
2411 {
2412         int     mib[6];
2413         char    *buf;
2414         size_t  msize;
2415         struct  if_msghdr *ifm;
2416         int     mtu;
2417
2418         mib[0] = CTL_NET;
2419         mib[1] = PF_ROUTE;
2420         mib[2] = 0;
2421         mib[3] = AF_INET6;
2422         mib[4] = NET_RT_IFLIST;
2423         mib[5] = ifindex;
2424         if (sysctl(mib, nitems(mib), NULL, &msize, NULL, 0) < 0) {
2425                 fatal("sysctl estimate NET_RT_IFLIST");
2426                 /*NOTREACHED*/
2427         }
2428         if ((buf = malloc(msize)) == NULL) {
2429                 fatal("malloc");
2430                 /*NOTREACHED*/
2431         }
2432         if (sysctl(mib, nitems(mib), buf, &msize, NULL, 0) < 0) {
2433                 fatal("sysctl NET_RT_IFLIST");
2434                 /*NOTREACHED*/
2435         }
2436         ifm = (struct if_msghdr *)buf;
2437         mtu = ifm->ifm_data.ifi_mtu;
2438         if (ifindex != ifm->ifm_index) {
2439                 fatal("ifindex does not match with ifm_index");
2440                 /*NOTREACHED*/
2441         }
2442         free(buf);
2443         return mtu;
2444 }
2445
2446 const char *
2447 rttypes(struct rt_msghdr *rtm)
2448 {
2449 #define RTTYPE(s, f) \
2450 do { \
2451         if (rtm->rtm_type == (f)) \
2452                 return (s); \
2453 } while (0)
2454         RTTYPE("ADD", RTM_ADD);
2455         RTTYPE("DELETE", RTM_DELETE);
2456         RTTYPE("CHANGE", RTM_CHANGE);
2457         RTTYPE("GET", RTM_GET);
2458         RTTYPE("LOSING", RTM_LOSING);
2459         RTTYPE("REDIRECT", RTM_REDIRECT);
2460         RTTYPE("MISS", RTM_MISS);
2461         RTTYPE("LOCK", RTM_LOCK);
2462         RTTYPE("NEWADDR", RTM_NEWADDR);
2463         RTTYPE("DELADDR", RTM_DELADDR);
2464         RTTYPE("IFINFO", RTM_IFINFO);
2465 #ifdef RTM_OIFINFO
2466         RTTYPE("OIFINFO", RTM_OIFINFO);
2467 #endif
2468 #ifdef RTM_IFANNOUNCE
2469         RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE);
2470 #endif
2471 #ifdef RTM_NEWMADDR
2472         RTTYPE("NEWMADDR", RTM_NEWMADDR);
2473 #endif
2474 #ifdef RTM_DELMADDR
2475         RTTYPE("DELMADDR", RTM_DELMADDR);
2476 #endif
2477 #undef RTTYPE
2478         return NULL;
2479 }
2480
2481 const char *
2482 rtflags(struct rt_msghdr *rtm)
2483 {
2484         static char buf[BUFSIZ];
2485
2486         /*
2487          * letter conflict should be okay.  painful when *BSD diverges...
2488          */
2489         strlcpy(buf, "", sizeof(buf));
2490 #define RTFLAG(s, f) \
2491 do { \
2492         if (rtm->rtm_flags & (f)) \
2493                 strlcat(buf, (s), sizeof(buf)); \
2494 } while (0)
2495         RTFLAG("U", RTF_UP);
2496         RTFLAG("G", RTF_GATEWAY);
2497         RTFLAG("H", RTF_HOST);
2498         RTFLAG("R", RTF_REJECT);
2499         RTFLAG("D", RTF_DYNAMIC);
2500         RTFLAG("M", RTF_MODIFIED);
2501         RTFLAG("d", RTF_DONE);
2502 #ifdef  RTF_MASK
2503         RTFLAG("m", RTF_MASK);
2504 #endif
2505 #ifdef RTF_CLONED
2506         RTFLAG("c", RTF_CLONED);
2507 #endif
2508         RTFLAG("X", RTF_XRESOLVE);
2509 #ifdef RTF_LLINFO
2510         RTFLAG("L", RTF_LLINFO);
2511 #endif
2512         RTFLAG("S", RTF_STATIC);
2513         RTFLAG("B", RTF_BLACKHOLE);
2514 #ifdef RTF_PROTO3
2515         RTFLAG("3", RTF_PROTO3);
2516 #endif
2517         RTFLAG("2", RTF_PROTO2);
2518         RTFLAG("1", RTF_PROTO1);
2519 #ifdef RTF_BROADCAST
2520         RTFLAG("b", RTF_BROADCAST);
2521 #endif
2522 #ifdef RTF_DEFAULT
2523         RTFLAG("d", RTF_DEFAULT);
2524 #endif
2525 #ifdef RTF_ISAROUTER
2526         RTFLAG("r", RTF_ISAROUTER);
2527 #endif
2528 #ifdef RTF_TUNNEL
2529         RTFLAG("T", RTF_TUNNEL);
2530 #endif
2531 #ifdef RTF_AUTH
2532         RTFLAG("A", RTF_AUTH);
2533 #endif
2534 #ifdef RTF_CRYPT
2535         RTFLAG("E", RTF_CRYPT);
2536 #endif
2537 #undef RTFLAG
2538         return buf;
2539 }
2540
2541 const char *
2542 ifflags(int flags)
2543 {
2544         static char buf[BUFSIZ];
2545
2546         strlcpy(buf, "", sizeof(buf));
2547 #define IFFLAG(s, f) \
2548 do { \
2549         if (flags & (f)) { \
2550                 if (buf[0]) \
2551                         strlcat(buf, ",", sizeof(buf)); \
2552                 strlcat(buf, (s), sizeof(buf)); \
2553         } \
2554 } while (0)
2555         IFFLAG("UP", IFF_UP);
2556         IFFLAG("BROADCAST", IFF_BROADCAST);
2557         IFFLAG("DEBUG", IFF_DEBUG);
2558         IFFLAG("LOOPBACK", IFF_LOOPBACK);
2559         IFFLAG("POINTOPOINT", IFF_POINTOPOINT);
2560 #ifdef IFF_NOTRAILERS
2561         IFFLAG("NOTRAILERS", IFF_NOTRAILERS);
2562 #endif
2563 #ifdef IFF_SMART
2564         IFFLAG("SMART", IFF_SMART);
2565 #endif
2566         IFFLAG("RUNNING", IFF_RUNNING);
2567         IFFLAG("NOARP", IFF_NOARP);
2568         IFFLAG("PROMISC", IFF_PROMISC);
2569         IFFLAG("ALLMULTI", IFF_ALLMULTI);
2570         IFFLAG("OACTIVE", IFF_OACTIVE);
2571         IFFLAG("SIMPLEX", IFF_SIMPLEX);
2572         IFFLAG("LINK0", IFF_LINK0);
2573         IFFLAG("LINK1", IFF_LINK1);
2574         IFFLAG("LINK2", IFF_LINK2);
2575         IFFLAG("MULTICAST", IFF_MULTICAST);
2576 #undef IFFLAG
2577         return buf;
2578 }
2579
2580 void
2581 krtread(int again)
2582 {
2583         int mib[6];
2584         size_t msize;
2585         char *buf, *p, *lim;
2586         struct rt_msghdr *rtm;
2587         int retry;
2588         const char *errmsg;
2589
2590         retry = 0;
2591         buf = NULL;
2592         mib[0] = CTL_NET;
2593         mib[1] = PF_ROUTE;
2594         mib[2] = 0;
2595         mib[3] = AF_INET6;      /* Address family */
2596         mib[4] = NET_RT_DUMP;   /* Dump the kernel routing table */
2597         mib[5] = 0;             /* No flags */
2598         do {
2599                 if (retry)
2600                         sleep(1);
2601                 retry++;
2602                 errmsg = NULL;
2603                 if (buf) {
2604                         free(buf);
2605                         buf = NULL;
2606                 }
2607                 if (sysctl(mib, nitems(mib), NULL, &msize, NULL, 0) < 0) {
2608                         errmsg = "sysctl estimate";
2609                         continue;
2610                 }
2611                 if ((buf = malloc(msize)) == NULL) {
2612                         errmsg = "malloc";
2613                         continue;
2614                 }
2615                 if (sysctl(mib, nitems(mib), buf, &msize, NULL, 0) < 0) {
2616                         errmsg = "sysctl NET_RT_DUMP";
2617                         continue;
2618                 }
2619         } while (retry < RT_DUMP_MAXRETRY && errmsg != NULL);
2620         if (errmsg) {
2621                 fatal("%s (with %d retries, msize=%lu)", errmsg, retry,
2622                     (u_long)msize);
2623                 /*NOTREACHED*/
2624         } else if (1 < retry)
2625                 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry);
2626
2627         lim = buf + msize;
2628         for (p = buf; p < lim; p += rtm->rtm_msglen) {
2629                 rtm = (struct rt_msghdr *)p;
2630                 rt_entry(rtm, again);
2631         }
2632         free(buf);
2633 }
2634
2635 void
2636 rt_entry(struct rt_msghdr *rtm, int again)
2637 {
2638         struct  sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask;
2639         struct  sockaddr_in6 *sin6_genmask, *sin6_ifp;
2640         char    *rtmp, *ifname = NULL;
2641         struct  riprt *rrt, *orrt;
2642         struct  netinfo6 *np;
2643         int ifindex;
2644
2645         sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0;
2646         if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags &
2647                 (RTF_XRESOLVE|RTF_BLACKHOLE)) {
2648                 return;         /* not interested in the link route */
2649         }
2650         /* do not look at cloned routes */
2651 #ifdef RTF_WASCLONED
2652         if (rtm->rtm_flags & RTF_WASCLONED)
2653                 return;
2654 #endif
2655 #ifdef RTF_CLONED
2656         if (rtm->rtm_flags & RTF_CLONED)
2657                 return;
2658 #endif
2659         /* XXX: Ignore connected routes. */
2660         if (!(rtm->rtm_flags & (RTF_GATEWAY|RTF_HOST|RTF_STATIC)))
2661                 return;
2662         /*
2663          * do not look at dynamic routes.
2664          * netbsd/openbsd cloned routes have UGHD.
2665          */
2666         if (rtm->rtm_flags & RTF_DYNAMIC)
2667                 return;
2668         rtmp = (char *)(rtm + 1);
2669         /* Destination */
2670         if ((rtm->rtm_addrs & RTA_DST) == 0)
2671                 return;         /* ignore routes without destination address */
2672         sin6_dst = (struct sockaddr_in6 *)rtmp;
2673         rtmp += ROUNDUP(sin6_dst->sin6_len);
2674         if (rtm->rtm_addrs & RTA_GATEWAY) {
2675                 sin6_gw = (struct sockaddr_in6 *)rtmp;
2676                 rtmp += ROUNDUP(sin6_gw->sin6_len);
2677         }
2678         if (rtm->rtm_addrs & RTA_NETMASK) {
2679                 sin6_mask = (struct sockaddr_in6 *)rtmp;
2680                 rtmp += ROUNDUP(sin6_mask->sin6_len);
2681         }
2682         if (rtm->rtm_addrs & RTA_GENMASK) {
2683                 sin6_genmask = (struct sockaddr_in6 *)rtmp;
2684                 rtmp += ROUNDUP(sin6_genmask->sin6_len);
2685         }
2686         if (rtm->rtm_addrs & RTA_IFP) {
2687                 sin6_ifp = (struct sockaddr_in6 *)rtmp;
2688                 rtmp += ROUNDUP(sin6_ifp->sin6_len);
2689         }
2690
2691         /* Destination */
2692         if (sin6_dst->sin6_family != AF_INET6)
2693                 return;
2694         if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr))
2695                 return;         /* Link-local */
2696         if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback))
2697                 return;         /* Loopback */
2698         if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr))
2699                 return;
2700
2701         if ((rrt = MALLOC(struct riprt)) == NULL) {
2702                 fatal("malloc: struct riprt");
2703                 /*NOTREACHED*/
2704         }
2705         memset(rrt, 0, sizeof(*rrt));
2706         np = &rrt->rrt_info;
2707         rrt->rrt_same = NULL;
2708         rrt->rrt_t = time(NULL);
2709         if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC))
2710                 rrt->rrt_t = 0; /* Don't age static routes */
2711         if (rtm->rtm_flags & Pflag)
2712                 rrt->rrt_t = 0; /* Don't age PROTO[123] routes */
2713         if ((rtm->rtm_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST)
2714                 rrt->rrt_t = 0; /* Don't age non-gateway host routes */
2715         np->rip6_tag = 0;
2716         np->rip6_metric = rtm->rtm_rmx.rmx_hopcount;
2717         if (np->rip6_metric < 1)
2718                 np->rip6_metric = 1;
2719         rrt->rrt_flags = rtm->rtm_flags;
2720         np->rip6_dest = sin6_dst->sin6_addr;
2721
2722         /* Mask or plen */
2723         if (rtm->rtm_flags & RTF_HOST)
2724                 np->rip6_plen = 128;    /* Host route */
2725         else if (sin6_mask)
2726                 np->rip6_plen = sin6mask2len(sin6_mask);
2727         else
2728                 np->rip6_plen = 0;
2729
2730         orrt = rtsearch(np);
2731         if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) {
2732                 /* Already found */
2733                 if (!again) {
2734                         trace(1, "route: %s/%d flags %s: already registered\n",
2735                                 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2736                                 rtflags(rtm));
2737                 }
2738                 free(rrt);
2739                 return;
2740         }
2741         /* Gateway */
2742         if (!sin6_gw)
2743                 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2744         else {
2745                 if (sin6_gw->sin6_family == AF_INET6)
2746                         rrt->rrt_gw = sin6_gw->sin6_addr;
2747                 else if (sin6_gw->sin6_family == AF_LINK) {
2748                         /* XXX in case ppp link? */
2749                         rrt->rrt_gw = in6addr_loopback;
2750                 } else
2751                         memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2752         }
2753         trace(1, "route: %s/%d flags %s",
2754                 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm));
2755         trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw));
2756
2757         /* Interface */
2758         ifindex = rtm->rtm_index;
2759         if ((unsigned int)ifindex < nindex2ifc && index2ifc[ifindex])
2760                 ifname = index2ifc[ifindex]->ifc_name;
2761         else {
2762                 trace(1, " not configured\n");
2763                 free(rrt);
2764                 return;
2765         }
2766         trace(1, " if %s sock %d", ifname, ifindex);
2767         rrt->rrt_index = ifindex;
2768
2769         trace(1, "\n");
2770
2771         /* Check gateway */
2772         if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) &&
2773             !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw) &&
2774             (rrt->rrt_flags & RTF_LOCAL) == 0) {
2775                 trace(0, "***** Gateway %s is not a link-local address.\n",
2776                         inet6_n2p(&rrt->rrt_gw));
2777                 trace(0, "*****     dest(%s) if(%s) -- Not optimized.\n",
2778                         inet6_n2p(&rrt->rrt_info.rip6_dest), ifname);
2779                 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR;
2780         }
2781
2782         /* Put it to the route list */
2783         if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) {
2784                 /* replace route list */
2785                 TAILQ_INSERT_BEFORE(orrt, rrt, rrt_next);
2786                 TAILQ_REMOVE(&riprt_head, orrt, rrt_next);
2787
2788                 trace(1, "route: %s/%d flags %s: replace new route\n",
2789                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2790                     rtflags(rtm));
2791                 free(orrt);
2792         } else
2793                 TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next);
2794 }
2795
2796 int
2797 addroute(struct riprt *rrt,
2798         const struct in6_addr *gw,
2799         struct ifc *ifcp)
2800 {
2801         struct  netinfo6 *np;
2802         u_char  buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ];
2803         struct  rt_msghdr       *rtm;
2804         struct  sockaddr_in6    *sin6;
2805         int     len;
2806
2807         np = &rrt->rrt_info;
2808         inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1));
2809         inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2));
2810         tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n",
2811                 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2812                 np->rip6_metric - 1, buf2);
2813         if (rtlog)
2814                 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(),
2815                         inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2816                         np->rip6_metric - 1, buf2);
2817         if (nflag)
2818                 return 0;
2819
2820         memset(buf, 0, sizeof(buf));
2821         rtm = (struct rt_msghdr *)buf;
2822         rtm->rtm_type = RTM_ADD;
2823         rtm->rtm_version = RTM_VERSION;
2824         rtm->rtm_seq = ++seq;
2825         rtm->rtm_pid = pid;
2826         rtm->rtm_flags = rrt->rrt_flags;
2827         rtm->rtm_flags |= Qflag;
2828         rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2829         rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1;
2830         rtm->rtm_inits = RTV_HOPCOUNT;
2831         sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2832         /* Destination */
2833         sin6->sin6_len = sizeof(struct sockaddr_in6);
2834         sin6->sin6_family = AF_INET6;
2835         sin6->sin6_addr = np->rip6_dest;
2836         sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2837         /* Gateway */
2838         sin6->sin6_len = sizeof(struct sockaddr_in6);
2839         sin6->sin6_family = AF_INET6;
2840         sin6->sin6_addr = *gw;
2841         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
2842                 sin6->sin6_scope_id = ifcp->ifc_index;
2843         sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2844         /* Netmask */
2845         sin6->sin6_len = sizeof(struct sockaddr_in6);
2846         sin6->sin6_family = AF_INET6;
2847         sin6->sin6_addr = *(plen2mask(np->rip6_plen));
2848         sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2849
2850         len = (char *)sin6 - (char *)buf;
2851         rtm->rtm_msglen = len;
2852         if (write(rtsock, buf, len) > 0)
2853                 return 0;
2854
2855         if (errno == EEXIST) {
2856                 trace(0, "ADD: Route already exists %s/%d gw %s\n",
2857                     inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2858                 if (rtlog)
2859                         fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n",
2860                             inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2861         } else {
2862                 trace(0, "Can not write to rtsock (addroute): %s\n",
2863                     strerror(errno));
2864                 if (rtlog)
2865                         fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2866                             strerror(errno));
2867         }
2868         return -1;
2869 }
2870
2871 int
2872 delroute(struct netinfo6 *np, struct in6_addr *gw)
2873 {
2874         u_char  buf[BUFSIZ], buf2[BUFSIZ];
2875         struct  rt_msghdr       *rtm;
2876         struct  sockaddr_in6    *sin6;
2877         int     len;
2878
2879         inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2));
2880         tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest),
2881                 np->rip6_plen, buf2);
2882         if (rtlog)
2883                 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n",
2884                         hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2885         if (nflag)
2886                 return 0;
2887
2888         memset(buf, 0, sizeof(buf));
2889         rtm = (struct rt_msghdr *)buf;
2890         rtm->rtm_type = RTM_DELETE;
2891         rtm->rtm_version = RTM_VERSION;
2892         rtm->rtm_seq = ++seq;
2893         rtm->rtm_pid = pid;
2894         rtm->rtm_flags = RTF_UP | RTF_GATEWAY;
2895         rtm->rtm_flags |= Qflag;
2896         if (np->rip6_plen == sizeof(struct in6_addr) * 8)
2897                 rtm->rtm_flags |= RTF_HOST;
2898         rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2899         sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2900         /* Destination */
2901         sin6->sin6_len = sizeof(struct sockaddr_in6);
2902         sin6->sin6_family = AF_INET6;
2903         sin6->sin6_addr = np->rip6_dest;
2904         sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2905         /* Gateway */
2906         sin6->sin6_len = sizeof(struct sockaddr_in6);
2907         sin6->sin6_family = AF_INET6;
2908         sin6->sin6_addr = *gw;
2909         sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2910         /* Netmask */
2911         sin6->sin6_len = sizeof(struct sockaddr_in6);
2912         sin6->sin6_family = AF_INET6;
2913         sin6->sin6_addr = *(plen2mask(np->rip6_plen));
2914         sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2915
2916         len = (char *)sin6 - (char *)buf;
2917         rtm->rtm_msglen = len;
2918         if (write(rtsock, buf, len) >= 0)
2919                 return 0;
2920
2921         if (errno == ESRCH) {
2922                 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n",
2923                     inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2924                 if (rtlog)
2925                         fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n",
2926                             inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2927         } else {
2928                 trace(0, "Can not write to rtsock (delroute): %s\n",
2929                     strerror(errno));
2930                 if (rtlog)
2931                         fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2932                             strerror(errno));
2933         }
2934         return -1;
2935 }
2936
2937 struct in6_addr *
2938 getroute(struct netinfo6 *np, struct in6_addr *gw)
2939 {
2940         u_char buf[BUFSIZ];
2941         int myseq;
2942         int len;
2943         struct rt_msghdr *rtm;
2944         struct sockaddr_in6 *sin6;
2945
2946         rtm = (struct rt_msghdr *)buf;
2947         len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6);
2948         memset(rtm, 0, len);
2949         rtm->rtm_type = RTM_GET;
2950         rtm->rtm_version = RTM_VERSION;
2951         myseq = ++seq;
2952         rtm->rtm_seq = myseq;
2953         rtm->rtm_addrs = RTA_DST;
2954         rtm->rtm_msglen = len;
2955         sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2956         sin6->sin6_len = sizeof(struct sockaddr_in6);
2957         sin6->sin6_family = AF_INET6;
2958         sin6->sin6_addr = np->rip6_dest;
2959         if (write(rtsock, buf, len) < 0) {
2960                 if (errno == ESRCH)     /* No such route found */
2961                         return NULL;
2962                 perror("write to rtsock");
2963                 exit(1);
2964         }
2965         do {
2966                 if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
2967                         perror("read from rtsock");
2968                         exit(1);
2969                 }
2970                 rtm = (struct rt_msghdr *)buf;
2971         } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid);
2972         sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2973         if (rtm->rtm_addrs & RTA_DST) {
2974                 sin6 = (struct sockaddr_in6 *)
2975                         ((char *)sin6 + ROUNDUP(sin6->sin6_len));
2976         }
2977         if (rtm->rtm_addrs & RTA_GATEWAY) {
2978                 *gw = sin6->sin6_addr;
2979                 return gw;
2980         }
2981         return NULL;
2982 }
2983
2984 const char *
2985 inet6_n2p(const struct in6_addr *p)
2986 {
2987         static char buf[BUFSIZ];
2988
2989         return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf));
2990 }
2991
2992 void
2993 ifrtdump(int sig)
2994 {
2995
2996         ifdump(sig);
2997         rtdump(sig);
2998 }
2999
3000 void
3001 ifdump(int sig)
3002 {
3003         struct ifc *ifcp;
3004         FILE *dump;
3005         int nifc = 0;
3006
3007         if (sig == 0)
3008                 dump = stderr;
3009         else
3010                 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
3011                         dump = stderr;
3012
3013         fprintf(dump, "%s: Interface Table Dump\n", hms());
3014         TAILQ_FOREACH(ifcp, &ifc_head, ifc_next)
3015                 nifc++;
3016         fprintf(dump, "  Number of interfaces: %d\n", nifc);
3017
3018         fprintf(dump, "  advertising interfaces:\n");
3019         TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
3020                 if ((ifcp->ifc_flags & IFF_UP) == 0)
3021                         continue;
3022                 if (iff_find(ifcp, IFIL_TYPE_N) != NULL)
3023                         continue;
3024                 ifdump0(dump, ifcp);
3025         }
3026         fprintf(dump, "\n");
3027         fprintf(dump, "  non-advertising interfaces:\n");
3028         TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
3029                 if ((ifcp->ifc_flags & IFF_UP) &&
3030                     (iff_find(ifcp, IFIL_TYPE_N) == NULL))
3031                         continue;
3032                 ifdump0(dump, ifcp);
3033         }
3034         fprintf(dump, "\n");
3035         if (dump != stderr)
3036                 fclose(dump);
3037 }
3038
3039 void
3040 ifdump0(FILE *dump, const struct ifc *ifcp)
3041 {
3042         struct ifac *ifac;
3043         struct iff *iffp;
3044         char buf[BUFSIZ];
3045         const char *ft;
3046         int addr;
3047
3048         fprintf(dump, "    %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n",
3049                 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags),
3050                 inet6_n2p(&ifcp->ifc_mylladdr),
3051                 ifcp->ifc_mtu, ifcp->ifc_metric);
3052         TAILQ_FOREACH(ifac, &ifcp->ifc_ifac_head, ifac_next) {
3053                 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
3054                         inet_ntop(AF_INET6, (void *)&ifac->ifac_raddr,
3055                                 buf, sizeof(buf));
3056                         fprintf(dump, "\t%s/%d -- %s\n",
3057                                 inet6_n2p(&ifac->ifac_addr),
3058                                 ifac->ifac_plen, buf);
3059                 } else {
3060                         fprintf(dump, "\t%s/%d\n",
3061                                 inet6_n2p(&ifac->ifac_addr),
3062                                 ifac->ifac_plen);
3063                 }
3064         }
3065
3066         fprintf(dump, "\tFilter:\n");
3067         TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) {
3068                 addr = 0;
3069                 switch (iffp->iff_type) {
3070                 case IFIL_TYPE_A:
3071                         ft = "Aggregate"; addr++; break;
3072                 case IFIL_TYPE_N:
3073                         ft = "No-use"; break;
3074                 case IFIL_TYPE_O:
3075                         ft = "Advertise-only"; addr++; break;
3076                 case IFIL_TYPE_T:
3077                         ft = "Default-only"; break;
3078                 case IFIL_TYPE_L:
3079                         ft = "Listen-only"; addr++; break;
3080                 default:
3081                         snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type);
3082                         ft = buf;
3083                         addr++;
3084                         break;
3085                 }
3086                 fprintf(dump, "\t\t%s", ft);
3087                 if (addr)
3088                         fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr),
3089                                 iffp->iff_plen);
3090                 fprintf(dump, "\n");
3091         }
3092         fprintf(dump, "\n");
3093 }
3094
3095 void
3096 rtdump(int sig)
3097 {
3098         struct  riprt *rrt;
3099         char    buf[BUFSIZ];
3100         FILE    *dump;
3101         time_t  t, age;
3102
3103         if (sig == 0)
3104                 dump = stderr;
3105         else
3106                 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
3107                         dump = stderr;
3108
3109         t = time(NULL);
3110         fprintf(dump, "\n%s: Routing Table Dump\n", hms());
3111         TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
3112                 if (rrt->rrt_t == 0)
3113                         age = 0;
3114                 else
3115                         age = t - rrt->rrt_t;
3116                 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest,
3117                         buf, sizeof(buf));
3118                 fprintf(dump, "    %s/%d if(%d:%s) gw(%s) [%d] age(%ld)",
3119                         buf, rrt->rrt_info.rip6_plen, rrt->rrt_index,
3120                         index2ifc[rrt->rrt_index]->ifc_name,
3121                         inet6_n2p(&rrt->rrt_gw),
3122                         rrt->rrt_info.rip6_metric, (long)age);
3123                 if (rrt->rrt_info.rip6_tag) {
3124                         fprintf(dump, " tag(0x%04x)",
3125                                 ntohs(rrt->rrt_info.rip6_tag) & 0xffff);
3126                 }
3127                 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)
3128                         fprintf(dump, " NOT-LL");
3129                 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
3130                         fprintf(dump, " NO-ADV");
3131                 fprintf(dump, "\n");
3132         }
3133         fprintf(dump, "\n");
3134         if (dump != stderr)
3135                 fclose(dump);
3136 }
3137
3138 /*
3139  * Parse the -A (and -O) options and put corresponding filter object to the
3140  * specified interface structures.  Each of the -A/O option has the following
3141  * syntax:      -A 5f09:c400::/32,ef0,ef1  (aggregate)
3142  *              -O 5f09:c400::/32,ef0,ef1  (only when match)
3143  */
3144 void
3145 filterconfig(void)
3146 {
3147         int i;
3148         char *p, *ap, *iflp, *ifname, *ep;
3149         struct iff iff, *iffp;
3150         struct ifc *ifcp;
3151         struct riprt *rrt;
3152 #if 0
3153         struct in6_addr gw;
3154 #endif
3155         u_long plen;
3156
3157         for (i = 0; i < nfilter; i++) {
3158                 ap = filter[i];
3159                 iflp = NULL;
3160                 iffp = &iff;
3161                 memset(iffp, 0, sizeof(*iffp));
3162                 if (filtertype[i] == 'N' || filtertype[i] == 'T') {
3163                         iflp = ap;
3164                         goto ifonly;
3165                 }
3166                 if ((p = strchr(ap, ',')) != NULL) {
3167                         *p++ = '\0';
3168                         iflp = p;
3169                 }
3170                 if ((p = strchr(ap, '/')) == NULL) {
3171                         fatal("no prefixlen specified for '%s'", ap);
3172                         /*NOTREACHED*/
3173                 }
3174                 *p++ = '\0';
3175                 if (inet_pton(AF_INET6, ap, &iffp->iff_addr) != 1) {
3176                         fatal("invalid prefix specified for '%s'", ap);
3177                         /*NOTREACHED*/
3178                 }
3179                 errno = 0;
3180                 ep = NULL;
3181                 plen = strtoul(p, &ep, 10);
3182                 if (errno || !*p || *ep || plen > sizeof(iffp->iff_addr) * 8) {
3183                         fatal("invalid prefix length specified for '%s'", ap);
3184                         /*NOTREACHED*/
3185                 }
3186                 iffp->iff_plen = plen;
3187                 applyplen(&iffp->iff_addr, iffp->iff_plen);
3188 ifonly:
3189                 iffp->iff_type = filtertype[i];
3190                 if (iflp == NULL || *iflp == '\0') {
3191                         fatal("no interface specified for '%s'", ap);
3192                         /*NOTREACHED*/
3193                 }
3194                 /* parse the interface listing portion */
3195                 while (iflp) {
3196                         ifname = iflp;
3197                         if ((iflp = strchr(iflp, ',')) != NULL)
3198                                 *iflp++ = '\0';
3199
3200                         TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
3201                                 if (fnmatch(ifname, ifcp->ifc_name, 0) != 0)
3202                                         continue;
3203
3204                                 iffp = malloc(sizeof(*iffp));
3205                                 if (iffp == NULL) {
3206                                         fatal("malloc of iff");
3207                                         /*NOTREACHED*/
3208                                 }
3209                                 memcpy(iffp, &iff, sizeof(*iffp));
3210 #if 0
3211                                 syslog(LOG_INFO, "Add filter: type %d, ifname %s.", iffp->iff_type, ifname);
3212 #endif
3213                                 TAILQ_INSERT_HEAD(&ifcp->ifc_iff_head, iffp, iff_next);
3214                         }
3215                 }
3216
3217                 /*
3218                  * -A: aggregate configuration.
3219                  */
3220                 if (filtertype[i] != IFIL_TYPE_A)
3221                         continue;
3222                 /* put the aggregate to the kernel routing table */
3223                 rrt = (struct riprt *)malloc(sizeof(struct riprt));
3224                 if (rrt == NULL) {
3225                         fatal("malloc: rrt");
3226                         /*NOTREACHED*/
3227                 }
3228                 memset(rrt, 0, sizeof(struct riprt));
3229                 rrt->rrt_info.rip6_dest = iff.iff_addr;
3230                 rrt->rrt_info.rip6_plen = iff.iff_plen;
3231                 rrt->rrt_info.rip6_metric = 1;
3232                 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
3233                 rrt->rrt_gw = in6addr_loopback;
3234                 rrt->rrt_flags = RTF_UP | RTF_REJECT;
3235                 rrt->rrt_rflags = RRTF_AGGREGATE;
3236                 rrt->rrt_t = 0;
3237                 rrt->rrt_index = loopifcp->ifc_index;
3238 #if 0
3239                 if (getroute(&rrt->rrt_info, &gw)) {
3240 #if 0
3241                         /*
3242                          * When the address has already been registered in the
3243                          * kernel routing table, it should be removed
3244                          */
3245                         delroute(&rrt->rrt_info, &gw);
3246 #else
3247                         /* it is safer behavior */
3248                         errno = EINVAL;
3249                         fatal("%s/%u already in routing table, "
3250                             "cannot aggregate",
3251                             inet6_n2p(&rrt->rrt_info.rip6_dest),
3252                             rrt->rrt_info.rip6_plen);
3253                         /*NOTREACHED*/
3254 #endif
3255                 }
3256 #endif
3257                 /* Put the route to the list */
3258                 TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next);
3259                 trace(1, "Aggregate: %s/%d for %s\n",
3260                         inet6_n2p(&iff.iff_addr), iff.iff_plen,
3261                         loopifcp->ifc_name);
3262                 /* Add this route to the kernel */
3263                 if (nflag)      /* do not modify kernel routing table */
3264                         continue;
3265                 addroute(rrt, &in6addr_loopback, loopifcp);
3266         }
3267 }
3268
3269 /***************** utility functions *****************/
3270
3271 /*
3272  * Returns a pointer to ifac whose address and prefix length matches
3273  * with the address and prefix length specified in the arguments.
3274  */
3275 struct ifac *
3276 ifa_match(const struct ifc *ifcp,
3277         const struct in6_addr *ia,
3278         int plen)
3279 {
3280         struct ifac *ifac;
3281
3282         TAILQ_FOREACH(ifac, &ifcp->ifc_ifac_head, ifac_next) {
3283                 if (IN6_ARE_ADDR_EQUAL(&ifac->ifac_addr, ia) &&
3284                     ifac->ifac_plen == plen)
3285                         break;
3286         }
3287
3288         return (ifac);
3289 }
3290
3291 /*
3292  * Return a pointer to riprt structure whose address and prefix length
3293  * matches with the address and prefix length found in the argument.
3294  * Note: This is not a rtalloc().  Therefore exact match is necessary.
3295  */
3296 struct riprt *
3297 rtsearch(struct netinfo6 *np)
3298 {
3299         struct  riprt   *rrt;
3300
3301         TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
3302                 if (rrt->rrt_info.rip6_plen == np->rip6_plen &&
3303                     IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
3304                                        &np->rip6_dest))
3305                         break;
3306         }
3307
3308         return (rrt);
3309 }
3310
3311 int
3312 sin6mask2len(const struct sockaddr_in6 *sin6)
3313 {
3314
3315         return mask2len(&sin6->sin6_addr,
3316             sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr));
3317 }
3318
3319 int
3320 mask2len(const struct in6_addr *addr, int lenlim)
3321 {
3322         int i = 0, j;
3323         const u_char *p = (const u_char *)addr;
3324
3325         for (j = 0; j < lenlim; j++, p++) {
3326                 if (*p != 0xff)
3327                         break;
3328                 i += 8;
3329         }
3330         if (j < lenlim) {
3331                 switch (*p) {
3332 #define MASKLEN(m, l)   case m: do { i += l; break; } while (0)
3333                 MASKLEN(0xfe, 7); break;
3334                 MASKLEN(0xfc, 6); break;
3335                 MASKLEN(0xf8, 5); break;
3336                 MASKLEN(0xf0, 4); break;
3337                 MASKLEN(0xe0, 3); break;
3338                 MASKLEN(0xc0, 2); break;
3339                 MASKLEN(0x80, 1); break;
3340 #undef  MASKLEN
3341                 }
3342         }
3343         return i;
3344 }
3345
3346 void
3347 applymask(struct in6_addr *addr, struct in6_addr *mask)
3348 {
3349         int     i;
3350         u_long  *p, *q;
3351
3352         p = (u_long *)addr; q = (u_long *)mask;
3353         for (i = 0; i < 4; i++)
3354                 *p++ &= *q++;
3355 }
3356
3357 static const u_char plent[8] = {
3358         0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
3359 };
3360
3361 void
3362 applyplen(struct in6_addr *ia, int plen)
3363 {
3364         u_char  *p;
3365         int     i;
3366
3367         p = ia->s6_addr;
3368         for (i = 0; i < 16; i++) {
3369                 if (plen <= 0)
3370                         *p = 0;
3371                 else if (plen < 8)
3372                         *p &= plent[plen];
3373                 p++, plen -= 8;
3374         }
3375 }
3376
3377 static const int pl2m[9] = {
3378         0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
3379 };
3380
3381 struct in6_addr *
3382 plen2mask(int n)
3383 {
3384         static struct in6_addr ia;
3385         u_char  *p;
3386         int     i;
3387
3388         memset(&ia, 0, sizeof(struct in6_addr));
3389         p = (u_char *)&ia;
3390         for (i = 0; i < 16; i++, p++, n -= 8) {
3391                 if (n >= 8) {
3392                         *p = 0xff;
3393                         continue;
3394                 }
3395                 *p = pl2m[n];
3396                 break;
3397         }
3398         return &ia;
3399 }
3400
3401 char *
3402 allocopy(char *p)
3403 {
3404         int len = strlen(p) + 1;
3405         char *q = (char *)malloc(len);
3406
3407         if (!q) {
3408                 fatal("malloc");
3409                 /*NOTREACHED*/
3410         }
3411
3412         strlcpy(q, p, len);
3413         return q;
3414 }
3415
3416 char *
3417 hms(void)
3418 {
3419         static char buf[BUFSIZ];
3420         time_t t;
3421         struct  tm *tm;
3422
3423         t = time(NULL);
3424         if ((tm = localtime(&t)) == 0) {
3425                 fatal("localtime");
3426                 /*NOTREACHED*/
3427         }
3428         snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min,
3429             tm->tm_sec);
3430         return buf;
3431 }
3432
3433 #define RIPRANDDEV      1.0     /* 30 +- 15, max - min = 30 */
3434
3435 int
3436 ripinterval(int timer)
3437 {
3438         double r = rand();
3439
3440         interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5));
3441         nextalarm = time(NULL) + interval;
3442         return interval;
3443 }
3444
3445 time_t
3446 ripsuptrig(void)
3447 {
3448         time_t t;
3449
3450         double r = rand();
3451         t  = (int)(RIP_TRIG_INT6_MIN +
3452                 (RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX));
3453         sup_trig_update = time(NULL) + t;
3454         return t;
3455 }
3456
3457 void
3458 #ifdef __STDC__
3459 fatal(const char *fmt, ...)
3460 #else
3461 fatal(fmt, va_alist)
3462         char    *fmt;
3463         va_dcl
3464 #endif
3465 {
3466         va_list ap;
3467         char buf[1024];
3468
3469 #ifdef __STDC__
3470         va_start(ap, fmt);
3471 #else
3472         va_start(ap);
3473 #endif
3474         vsnprintf(buf, sizeof(buf), fmt, ap);
3475         va_end(ap);
3476         perror(buf);
3477         if (errno)
3478                 syslog(LOG_ERR, "%s: %s", buf, strerror(errno));
3479         else
3480                 syslog(LOG_ERR, "%s", buf);
3481         rtdexit();
3482 }
3483
3484 void
3485 #ifdef __STDC__
3486 tracet(int level, const char *fmt, ...)
3487 #else
3488 tracet(level, fmt, va_alist)
3489         int level;
3490         char *fmt;
3491         va_dcl
3492 #endif
3493 {
3494         va_list ap;
3495
3496         if (level <= dflag) {
3497 #ifdef __STDC__
3498                 va_start(ap, fmt);
3499 #else
3500                 va_start(ap);
3501 #endif
3502                 fprintf(stderr, "%s: ", hms());
3503                 vfprintf(stderr, fmt, ap);
3504                 va_end(ap);
3505         }
3506         if (dflag) {
3507 #ifdef __STDC__
3508                 va_start(ap, fmt);
3509 #else
3510                 va_start(ap);
3511 #endif
3512                 if (level > 0)
3513                         vsyslog(LOG_DEBUG, fmt, ap);
3514                 else
3515                         vsyslog(LOG_WARNING, fmt, ap);
3516                 va_end(ap);
3517         }
3518 }
3519
3520 void
3521 #ifdef __STDC__
3522 trace(int level, const char *fmt, ...)
3523 #else
3524 trace(level, fmt, va_alist)
3525         int level;
3526         char *fmt;
3527         va_dcl
3528 #endif
3529 {
3530         va_list ap;
3531
3532         if (level <= dflag) {
3533 #ifdef __STDC__
3534                 va_start(ap, fmt);
3535 #else
3536                 va_start(ap);
3537 #endif
3538                 vfprintf(stderr, fmt, ap);
3539                 va_end(ap);
3540         }
3541         if (dflag) {
3542 #ifdef __STDC__
3543                 va_start(ap, fmt);
3544 #else
3545                 va_start(ap);
3546 #endif
3547                 if (level > 0)
3548                         vsyslog(LOG_DEBUG, fmt, ap);
3549                 else
3550                         vsyslog(LOG_WARNING, fmt, ap);
3551                 va_end(ap);
3552         }
3553 }
3554
3555 unsigned int
3556 if_maxindex(void)
3557 {
3558         struct if_nameindex *p, *p0;
3559         unsigned int max = 0;
3560
3561         p0 = if_nameindex();
3562         for (p = p0; p && p->if_index && p->if_name; p++) {
3563                 if (max < p->if_index)
3564                         max = p->if_index;
3565         }
3566         if_freenameindex(p0);
3567         return max;
3568 }
3569
3570 struct ifc *
3571 ifc_find(char *name)
3572 {
3573         struct ifc *ifcp;
3574
3575         TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
3576                 if (strcmp(name, ifcp->ifc_name) == 0)
3577                         break;
3578         }
3579         return (ifcp);
3580 }
3581
3582 struct iff *
3583 iff_find(struct ifc *ifcp, int type)
3584 {
3585         struct iff *iffp;
3586
3587         TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) {
3588                 if (type == IFIL_TYPE_ANY ||
3589                     type == iffp->iff_type)
3590                         break;
3591         }
3592
3593         return (iffp);
3594 }
3595
3596 void
3597 setindex2ifc(int idx, struct ifc *ifcp)
3598 {
3599         int n, nsize;
3600         struct ifc **p;
3601
3602         if (!index2ifc) {
3603                 nindex2ifc = 5; /*initial guess*/
3604                 index2ifc = (struct ifc **)
3605                         malloc(sizeof(*index2ifc) * nindex2ifc);
3606                 if (index2ifc == NULL) {
3607                         fatal("malloc");
3608                         /*NOTREACHED*/
3609                 }
3610                 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc);
3611         }
3612         n = nindex2ifc;
3613         for (nsize = nindex2ifc; nsize <= idx; nsize *= 2)
3614                 ;
3615         if (n != nsize) {
3616                 p = (struct ifc **)realloc(index2ifc,
3617                     sizeof(*index2ifc) * nsize);
3618                 if (p == NULL) {
3619                         fatal("realloc");
3620                         /*NOTREACHED*/
3621                 }
3622                 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n));
3623                 index2ifc = p;
3624                 nindex2ifc = nsize;
3625         }
3626         index2ifc[idx] = ifcp;
3627 }