sbin/ifconfig/af_inet6.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static const char rcsid[] =
  32   "$FreeBSD$";
  33 #endif /* not lint */
  34
  35 #include <sys/param.h>
  36 #include <sys/ioctl.h>
  37 #include <sys/socket.h>
  38 #include <net/if.h>
  39
  40 #include <err.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45 #include <ifaddrs.h>
  46
  47 #include <arpa/inet.h>
  48
  49 #include <netinet/in.h>
  50 #include <net/if_var.h>         /* for struct ifaddr */
  51 #include <netinet/in_var.h>
  52 #include <arpa/inet.h>
  53 #include <netdb.h>
  54
  55 #include <netinet6/nd6.h>       /* Define ND6_INFINITE_LIFETIME */
  56
  57 #include "ifconfig.h"
  58
  59 static  struct in6_ifreq in6_ridreq;
  60 static  struct in6_aliasreq in6_addreq =
  61   { { 0 },
  62     { 0 },
  63     { 0 },
  64     { 0 },
  65     0,
  66     { 0, 0, ND6_INFINITE_LIFETIME, ND6_INFINITE_LIFETIME } };
  67 static  int ip6lifetime;
  68
  69 static  void in6_fillscopeid(struct sockaddr_in6 *sin6);
  70 static  int prefix(void *, int);
  71 static  char *sec2str(time_t);
  72 static  int explicit_prefix = 0;
  73
  74 static  char addr_buf[MAXHOSTNAMELEN *2 + 1];   /*for getnameinfo()*/
  75
  76 static void
  77 setifprefixlen(const char *addr, int dummy __unused, int s,
  78     const struct afswtch *afp)
  79 {
  80         if (afp->af_getprefix != NULL)
  81                 afp->af_getprefix(addr, MASK);
  82         explicit_prefix = 1;
  83 }
  84
  85 static void
  86 setip6flags(const char *dummyaddr __unused, int flag, int dummysoc __unused,
  87     const struct afswtch *afp)
  88 {
  89         if (afp->af_af != AF_INET6)
  90                 err(1, "address flags can be set only for inet6 addresses");
  91
  92         if (flag < 0)
  93                 in6_addreq.ifra_flags &= ~(-flag);
  94         else
  95                 in6_addreq.ifra_flags |= flag;
  96 }
  97
  98 static void
  99 setip6lifetime(const char *cmd, const char *val, int s,
 100     const struct afswtch *afp)
 101 {
 102         time_t newval, t;
 103         char *ep;
 104
 105         t = time(NULL);
 106         newval = (time_t)strtoul(val, &ep, 0);
 107         if (val == ep)
 108                 errx(1, "invalid %s", cmd);
 109         if (afp->af_af != AF_INET6)
 110                 errx(1, "%s not allowed for the AF", cmd);
 111         if (strcmp(cmd, "vltime") == 0) {
 112                 in6_addreq.ifra_lifetime.ia6t_expire = t + newval;
 113                 in6_addreq.ifra_lifetime.ia6t_vltime = newval;
 114         } else if (strcmp(cmd, "pltime") == 0) {
 115                 in6_addreq.ifra_lifetime.ia6t_preferred = t + newval;
 116                 in6_addreq.ifra_lifetime.ia6t_pltime = newval;
 117         }
 118 }
 119
 120 static void
 121 setip6pltime(const char *seconds, int dummy __unused, int s,
 122     const struct afswtch *afp)
 123 {
 124         setip6lifetime("pltime", seconds, s, afp);
 125 }
 126
 127 static void
 128 setip6vltime(const char *seconds, int dummy __unused, int s,
 129     const struct afswtch *afp)
 130 {
 131         setip6lifetime("vltime", seconds, s, afp);
 132 }
 133
 134 static void
 135 setip6eui64(const char *cmd, int dummy __unused, int s,
 136     const struct afswtch *afp)
 137 {
 138         struct ifaddrs *ifap, *ifa;
 139         const struct sockaddr_in6 *sin6 = NULL;
 140         const struct in6_addr *lladdr = NULL;
 141         struct in6_addr *in6;
 142
 143         if (afp->af_af != AF_INET6)
 144                 errx(EXIT_FAILURE, "%s not allowed for the AF", cmd);
 145         in6 = (struct in6_addr *)&in6_addreq.ifra_addr.sin6_addr;
 146         if (memcmp(&in6addr_any.s6_addr[8], &in6->s6_addr[8], 8) != 0)
 147                 errx(EXIT_FAILURE, "interface index is already filled");
 148         if (getifaddrs(&ifap) != 0)
 149                 err(EXIT_FAILURE, "getifaddrs");
 150         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 151                 if (ifa->ifa_addr->sa_family == AF_INET6 &&
 152                     strcmp(ifa->ifa_name, name) == 0) {
 153                         sin6 = (const struct sockaddr_in6 *)ifa->ifa_addr;
 154                         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
 155                                 lladdr = &sin6->sin6_addr;
 156                                 break;
 157                         }
 158                 }
 159         }
 160         if (!lladdr)
 161                 errx(EXIT_FAILURE, "could not determine link local address");
 162
 163         memcpy(&in6->s6_addr[8], &lladdr->s6_addr[8], 8);
 164
 165         freeifaddrs(ifap);
 166 }
 167
 168 static void
 169 in6_fillscopeid(struct sockaddr_in6 *sin6)
 170 {
 171 #if defined(__KAME__) && defined(KAME_SCOPEID)
 172         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
 173                 sin6->sin6_scope_id =
 174                         ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
 175                 sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0;
 176         }
 177 #endif
 178 }
 179
 180 static void
 181 in6_status(int s __unused, const struct ifaddrs *ifa)
 182 {
 183         struct sockaddr_in6 *sin, null_sin;
 184         struct in6_ifreq ifr6;
 185         int s6;
 186         u_int32_t flags6;
 187         struct in6_addrlifetime lifetime;
 188         time_t t = time(NULL);
 189         int error;
 190         u_int32_t scopeid;
 191
 192         memset(&null_sin, 0, sizeof(null_sin));
 193
 194         sin = (struct sockaddr_in6 *)ifa->ifa_addr;
 195         if (sin == NULL)
 196                 return;
 197
 198         strncpy(ifr6.ifr_name, ifr.ifr_name, sizeof(ifr.ifr_name));
 199         if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 200                 warn("socket(AF_INET6,SOCK_DGRAM)");
 201                 return;
 202         }
 203         ifr6.ifr_addr = *sin;
 204         if (ioctl(s6, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
 205                 warn("ioctl(SIOCGIFAFLAG_IN6)");
 206                 close(s6);
 207                 return;
 208         }
 209         flags6 = ifr6.ifr_ifru.ifru_flags6;
 210         memset(&lifetime, 0, sizeof(lifetime));
 211         ifr6.ifr_addr = *sin;
 212         if (ioctl(s6, SIOCGIFALIFETIME_IN6, &ifr6) < 0) {
 213                 warn("ioctl(SIOCGIFALIFETIME_IN6)");
 214                 close(s6);
 215                 return;
 216         }
 217         lifetime = ifr6.ifr_ifru.ifru_lifetime;
 218         close(s6);
 219
 220         /* XXX: embedded link local addr check */
 221         if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr) &&
 222             *(u_short *)&sin->sin6_addr.s6_addr[2] != 0) {
 223                 u_short index;
 224
 225                 index = *(u_short *)&sin->sin6_addr.s6_addr[2];
 226                 *(u_short *)&sin->sin6_addr.s6_addr[2] = 0;
 227                 if (sin->sin6_scope_id == 0)
 228                         sin->sin6_scope_id = ntohs(index);
 229         }
 230         scopeid = sin->sin6_scope_id;
 231
 232         error = getnameinfo((struct sockaddr *)sin, sin->sin6_len, addr_buf,
 233                             sizeof(addr_buf), NULL, 0, NI_NUMERICHOST);
 234         if (error != 0)
 235                 inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf,
 236                           sizeof(addr_buf));
 237         printf("\tinet6 %s ", addr_buf);
 238
 239         if (ifa->ifa_flags & IFF_POINTOPOINT) {
 240                 sin = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
 241                 /*
 242                  * some of the interfaces do not have valid destination
 243                  * address.
 244                  */
 245                 if (sin != NULL && sin->sin6_family == AF_INET6) {
 246                         int error;
 247
 248                         /* XXX: embedded link local addr check */
 249                         if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr) &&
 250                             *(u_short *)&sin->sin6_addr.s6_addr[2] != 0) {
 251                                 u_short index;
 252
 253                                 index = *(u_short *)&sin->sin6_addr.s6_addr[2];
 254                                 *(u_short *)&sin->sin6_addr.s6_addr[2] = 0;
 255                                 if (sin->sin6_scope_id == 0)
 256                                         sin->sin6_scope_id = ntohs(index);
 257                         }
 258
 259                         error = getnameinfo((struct sockaddr *)sin,
 260                                             sin->sin6_len, addr_buf,
 261                                             sizeof(addr_buf), NULL, 0,
 262                                             NI_NUMERICHOST);
 263                         if (error != 0)
 264                                 inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf,
 265                                           sizeof(addr_buf));
 266                         printf("--> %s ", addr_buf);
 267                 }
 268         }
 269
 270         sin = (struct sockaddr_in6 *)ifa->ifa_netmask;
 271         if (sin == NULL)
 272                 sin = &null_sin;
 273         printf("prefixlen %d ", prefix(&sin->sin6_addr,
 274                 sizeof(struct in6_addr)));
 275
 276         if ((flags6 & IN6_IFF_ANYCAST) != 0)
 277                 printf("anycast ");
 278         if ((flags6 & IN6_IFF_TENTATIVE) != 0)
 279                 printf("tentative ");
 280         if ((flags6 & IN6_IFF_DUPLICATED) != 0)
 281                 printf("duplicated ");
 282         if ((flags6 & IN6_IFF_DETACHED) != 0)
 283                 printf("detached ");
 284         if ((flags6 & IN6_IFF_DEPRECATED) != 0)
 285                 printf("deprecated ");
 286         if ((flags6 & IN6_IFF_AUTOCONF) != 0)
 287                 printf("autoconf ");
 288         if ((flags6 & IN6_IFF_TEMPORARY) != 0)
 289                 printf("temporary ");
 290
 291         if (scopeid)
 292                 printf("scopeid 0x%x ", scopeid);
 293
 294         if (ip6lifetime && (lifetime.ia6t_preferred || lifetime.ia6t_expire)) {
 295                 printf("pltime ");
 296                 if (lifetime.ia6t_preferred) {
 297                         printf("%s ", lifetime.ia6t_preferred < t
 298                                 ? "0" : sec2str(lifetime.ia6t_preferred - t));
 299                 } else
 300                         printf("infty ");
 301
 302                 printf("vltime ");
 303                 if (lifetime.ia6t_expire) {
 304                         printf("%s ", lifetime.ia6t_expire < t
 305                                 ? "0" : sec2str(lifetime.ia6t_expire - t));
 306                 } else
 307                         printf("infty ");
 308         }
 309
 310         putchar('\n');
 311 }
 312
 313 #define SIN6(x) ((struct sockaddr_in6 *) &(x))
 314 static struct   sockaddr_in6 *sin6tab[] = {
 315         SIN6(in6_ridreq.ifr_addr), SIN6(in6_addreq.ifra_addr),
 316         SIN6(in6_addreq.ifra_prefixmask), SIN6(in6_addreq.ifra_dstaddr)
 317 };
 318
 319 static void
 320 in6_getprefix(const char *plen, int which)
 321 {
 322         struct sockaddr_in6 *sin = sin6tab[which];
 323         u_char *cp;
 324         int len = atoi(plen);
 325
 326         if ((len < 0) || (len > 128))
 327                 errx(1, "%s: bad value", plen);
 328         sin->sin6_len = sizeof(*sin);
 329         if (which != MASK)
 330                 sin->sin6_family = AF_INET6;
 331         if ((len == 0) || (len == 128)) {
 332                 memset(&sin->sin6_addr, 0xff, sizeof(struct in6_addr));
 333                 return;
 334         }
 335         memset((void *)&sin->sin6_addr, 0x00, sizeof(sin->sin6_addr));
 336         for (cp = (u_char *)&sin->sin6_addr; len > 7; len -= 8)
 337                 *cp++ = 0xff;
 338         *cp = 0xff << (8 - len);
 339 }
 340
 341 static void
 342 in6_getaddr(const char *s, int which)
 343 {
 344         struct sockaddr_in6 *sin = sin6tab[which];
 345         struct addrinfo hints, *res;
 346         int error = -1;
 347
 348         newaddr &= 1;
 349
 350         sin->sin6_len = sizeof(*sin);
 351         if (which != MASK)
 352                 sin->sin6_family = AF_INET6;
 353
 354         if (which == ADDR) {
 355                 char *p = NULL;
 356                 if((p = strrchr(s, '/')) != NULL) {
 357                         *p = '\0';
 358                         in6_getprefix(p + 1, MASK);
 359                         explicit_prefix = 1;
 360                 }
 361         }
 362
 363         if (sin->sin6_family == AF_INET6) {
 364                 bzero(&hints, sizeof(struct addrinfo));
 365                 hints.ai_family = AF_INET6;
 366                 error = getaddrinfo(s, NULL, &hints, &res);
 367         }
 368         if (error != 0) {
 369                 if (inet_pton(AF_INET6, s, &sin->sin6_addr) != 1)
 370                         errx(1, "%s: bad value", s);
 371         } else
 372                 bcopy(res->ai_addr, sin, res->ai_addrlen);
 373 }
 374
 375 static int
 376 prefix(void *val, int size)
 377 {
 378         u_char *name = (u_char *)val;
 379         int byte, bit, plen = 0;
 380
 381         for (byte = 0; byte < size; byte++, plen += 8)
 382                 if (name[byte] != 0xff)
 383                         break;
 384         if (byte == size)
 385                 return (plen);
 386         for (bit = 7; bit != 0; bit--, plen++)
 387                 if (!(name[byte] & (1 << bit)))
 388                         break;
 389         for (; bit != 0; bit--)
 390                 if (name[byte] & (1 << bit))
 391                         return(0);
 392         byte++;
 393         for (; byte < size; byte++)
 394                 if (name[byte])
 395                         return(0);
 396         return (plen);
 397 }
 398
 399 static char *
 400 sec2str(time_t total)
 401 {
 402         static char result[256];
 403         int days, hours, mins, secs;
 404         int first = 1;
 405         char *p = result;
 406
 407         if (0) {
 408                 days = total / 3600 / 24;
 409                 hours = (total / 3600) % 24;
 410                 mins = (total / 60) % 60;
 411                 secs = total % 60;
 412
 413                 if (days) {
 414                         first = 0;
 415                         p += sprintf(p, "%dd", days);
 416                 }
 417                 if (!first || hours) {
 418                         first = 0;
 419                         p += sprintf(p, "%dh", hours);
 420                 }
 421                 if (!first || mins) {
 422                         first = 0;
 423                         p += sprintf(p, "%dm", mins);
 424                 }
 425                 sprintf(p, "%ds", secs);
 426         } else
 427                 sprintf(result, "%lu", (unsigned long)total);
 428
 429         return(result);
 430 }
 431
 432 static void
 433 in6_postproc(int s, const struct afswtch *afp)
 434 {
 435         if (explicit_prefix == 0) {
 436                 /* Aggregatable address architecture defines all prefixes
 437                    are 64. So, it is convenient to set prefixlen to 64 if
 438                    it is not specified. */
 439                 setifprefixlen("64", 0, s, afp);
 440                 /* in6_getprefix("64", MASK) if MASK is available here... */
 441         }
 442 }
 443
 444 static void
 445 in6_status_tunnel(int s)
 446 {
 447         char src[NI_MAXHOST];
 448         char dst[NI_MAXHOST];
 449         struct in6_ifreq in6_ifr;
 450         const struct sockaddr *sa = (const struct sockaddr *) &in6_ifr.ifr_addr;
 451
 452         memset(&in6_ifr, 0, sizeof(in6_ifr));
 453         strncpy(in6_ifr.ifr_name, name, IFNAMSIZ);
 454
 455         if (ioctl(s, SIOCGIFPSRCADDR_IN6, (caddr_t)&in6_ifr) < 0)
 456                 return;
 457         if (sa->sa_family != AF_INET6)
 458                 return;
 459         in6_fillscopeid(&in6_ifr.ifr_addr);
 460         if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0,
 461             NI_NUMERICHOST) != 0)
 462                 src[0] = '\0';
 463
 464         if (ioctl(s, SIOCGIFPDSTADDR_IN6, (caddr_t)&in6_ifr) < 0)
 465                 return;
 466         if (sa->sa_family != AF_INET6)
 467                 return;
 468         in6_fillscopeid(&in6_ifr.ifr_addr);
 469         if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0,
 470             NI_NUMERICHOST) != 0)
 471                 dst[0] = '\0';
 472
 473         printf("\ttunnel inet6 %s --> %s\n", src, dst);
 474 }
 475
 476 static void
 477 in6_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
 478 {
 479         struct in6_aliasreq in6_addreq;
 480
 481         memset(&in6_addreq, 0, sizeof(in6_addreq));
 482         strncpy(in6_addreq.ifra_name, name, IFNAMSIZ);
 483         memcpy(&in6_addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
 484         memcpy(&in6_addreq.ifra_dstaddr, dstres->ai_addr,
 485             dstres->ai_addr->sa_len);
 486
 487         if (ioctl(s, SIOCSIFPHYADDR_IN6, &in6_addreq) < 0)
 488                 warn("SIOCSIFPHYADDR_IN6");
 489 }
 490
 491 static struct cmd inet6_cmds[] = {
 492         DEF_CMD_ARG("prefixlen",                        setifprefixlen),
 493         DEF_CMD("anycast",      IN6_IFF_ANYCAST,        setip6flags),
 494         DEF_CMD("tentative",    IN6_IFF_TENTATIVE,      setip6flags),
 495         DEF_CMD("-tentative",   -IN6_IFF_TENTATIVE,     setip6flags),
 496         DEF_CMD("deprecated",   IN6_IFF_DEPRECATED,     setip6flags),
 497         DEF_CMD("-deprecated", -IN6_IFF_DEPRECATED,     setip6flags),
 498         DEF_CMD("autoconf",     IN6_IFF_AUTOCONF,       setip6flags),
 499         DEF_CMD("-autoconf",    -IN6_IFF_AUTOCONF,      setip6flags),
 500         DEF_CMD_ARG("pltime",                           setip6pltime),
 501         DEF_CMD_ARG("vltime",                           setip6vltime),
 502         DEF_CMD("eui64",        0,                      setip6eui64),
 503 };
 504
 505 static struct afswtch af_inet6 = {
 506         .af_name        = "inet6",
 507         .af_af          = AF_INET6,
 508         .af_status      = in6_status,
 509         .af_getaddr     = in6_getaddr,
 510         .af_getprefix   = in6_getprefix,
 511         .af_postproc    = in6_postproc,
 512         .af_status_tunnel = in6_status_tunnel,
 513         .af_settunnel   = in6_set_tunnel,
 514         .af_difaddr     = SIOCDIFADDR_IN6,
 515         .af_aifaddr     = SIOCAIFADDR_IN6,
 516         .af_ridreq      = &in6_addreq,
 517         .af_addreq      = &in6_addreq,
 518 };
 519
 520 static void
 521 in6_Lopt_cb(const char *optarg __unused)
 522 {
 523         ip6lifetime++;  /* print IPv6 address lifetime */
 524 }
 525 static struct option in6_Lopt = { "L", "[-L]", in6_Lopt_cb };
 526
 527 static __constructor void
 528 inet6_ctor(void)
 529 {
 530 #define N(a)    (sizeof(a) / sizeof(a[0]))
 531         int i;
 532
 533         for (i = 0; i < N(inet6_cmds);  i++)
 534                 cmd_register(&inet6_cmds[i]);
 535         af_register(&af_inet6);
 536         opt_register(&in6_Lopt);
 537 #undef N
 538 }