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  * 3. 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  * $FreeBSD: src/sbin/ifconfig/af_inet6.c,v 1.3 2005/06/16 19:37:09 ume Exp $
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/ioctl.h>
  34 #include <sys/socket.h>
  35 #include <net/if.h>
  36 #include <net/if_var.h>         /* for struct ifaddr */
  37 #include <netinet/in.h>
  38 #include <netinet/in_var.h>
  39 #include <netinet6/nd6.h>       /* Define ND6_INFINITE_LIFETIME */
  40 #include <arpa/inet.h>
  41 #include <netdb.h>
  42
  43 #include <err.h>
  44 #include <ifaddrs.h>
  45 #include <stdbool.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <time.h>
  50 #include <unistd.h>
  51
  52 #include "ifconfig.h"
  53
  54 static  struct in6_ifreq in6_ridreq;
  55 static  struct in6_aliasreq in6_addreq =
  56   { { 0 },
  57     { 0 },
  58     { 0 },
  59     { 0 },
  60     0,
  61     { 0, 0, ND6_INFINITE_LIFETIME, ND6_INFINITE_LIFETIME } };
  62 static  int ip6lifetime;
  63
  64 static  void in6_fillscopeid(struct sockaddr_in6 *sin6);
  65 static  int prefix(void *, int);
  66 static  char *sec2str(time_t);
  67 static  int explicit_prefix = 0;
  68
  69 static  char addr_buf[NI_MAXHOST];  /* for getnameinfo() */
  70
  71 static void
  72 setifprefixlen(const char *addr, int dummy __unused, int s __unused,
  73     const struct afswtch *afp)
  74 {
  75         if (afp->af_getprefix != NULL)
  76                 afp->af_getprefix(addr, MASK);
  77         explicit_prefix = 1;
  78 }
  79
  80 static void
  81 setip6flags(const char *addr __unused, int flag, int s __unused,
  82     const struct afswtch *afp)
  83 {
  84         if (afp->af_af != AF_INET6)
  85                 err(1, "address flags can be set only for inet6 addresses");
  86
  87         if (flag < 0)
  88                 in6_addreq.ifra_flags &= ~(-flag);
  89         else
  90                 in6_addreq.ifra_flags |= flag;
  91 }
  92
  93 static void
  94 setip6lifetime(const char *cmd, const char *val, int s __unused,
  95     const struct afswtch *afp)
  96 {
  97         struct timespec now;
  98         time_t newval;
  99         char *ep;
 100
 101         clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 102         newval = (time_t)strtoul(val, &ep, 0);
 103         if (val == ep)
 104                 errx(1, "invalid %s", cmd);
 105         if (afp->af_af != AF_INET6)
 106                 errx(1, "%s not allowed for the AF", cmd);
 107         if (strcmp(cmd, "vltime") == 0) {
 108                 in6_addreq.ifra_lifetime.ia6t_expire = now.tv_sec + newval;
 109                 in6_addreq.ifra_lifetime.ia6t_vltime = newval;
 110         } else if (strcmp(cmd, "pltime") == 0) {
 111                 in6_addreq.ifra_lifetime.ia6t_preferred = now.tv_sec + newval;
 112                 in6_addreq.ifra_lifetime.ia6t_pltime = newval;
 113         }
 114 }
 115
 116 static void
 117 setip6pltime(const char *seconds, int dummy __unused, int s,
 118     const struct afswtch *afp)
 119 {
 120         setip6lifetime("pltime", seconds, s, afp);
 121 }
 122
 123 static void
 124 setip6vltime(const char *seconds, int dummy __unused, int s,
 125     const struct afswtch *afp)
 126 {
 127         setip6lifetime("vltime", seconds, s, afp);
 128 }
 129
 130 static void
 131 setip6eui64(const char *cmd, int dummy __unused, int s __unused,
 132     const struct afswtch *afp)
 133 {
 134         struct ifaddrs *ifap, *ifa;
 135         const struct sockaddr_in6 *sin6 = NULL;
 136         const struct in6_addr *lladdr = NULL;
 137         struct in6_addr *in6;
 138
 139         if (afp->af_af != AF_INET6)
 140                 errx(EXIT_FAILURE, "%s not allowed for the AF", cmd);
 141         in6 = (struct in6_addr *)&in6_addreq.ifra_addr.sin6_addr;
 142         if (memcmp(&in6addr_any.s6_addr[8], &in6->s6_addr[8], 8) != 0)
 143                 errx(EXIT_FAILURE, "interface index is already filled");
 144         if (getifaddrs(&ifap) != 0)
 145                 err(EXIT_FAILURE, "getifaddrs");
 146         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 147                 if (ifa->ifa_addr->sa_family == AF_INET6 &&
 148                     strcmp(ifa->ifa_name, IfName) == 0) {
 149                         sin6 = (const struct sockaddr_in6 *)ifa->ifa_addr;
 150                         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
 151                                 lladdr = &sin6->sin6_addr;
 152                                 break;
 153                         }
 154                 }
 155         }
 156         if (!lladdr)
 157                 errx(EXIT_FAILURE, "could not determine link local address");
 158
 159         memcpy(&in6->s6_addr[8], &lladdr->s6_addr[8], 8);
 160
 161         freeifaddrs(ifap);
 162 }
 163
 164 static void
 165 in6_fillscopeid(struct sockaddr_in6 *sin6)
 166 {
 167 #if defined(__KAME__) && defined(KAME_SCOPEID)
 168         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
 169                 sin6->sin6_scope_id =
 170                         ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
 171                 sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0;
 172         }
 173 #else
 174         (void)sin6;
 175 #endif
 176 }
 177
 178 static void
 179 in6_status(int s __unused, const struct ifaddrs *ifa)
 180 {
 181         struct sockaddr_in6 *sin, null_sin;
 182         struct in6_ifreq ifr6;
 183         int s6;
 184         u_int32_t flags6;
 185         struct in6_addrlifetime lifetime;
 186         struct timespec now;
 187         int n_flags, prefixlen;
 188         int error;
 189         u_int32_t scopeid;
 190
 191         clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 192
 193         memset(&null_sin, 0, sizeof(null_sin));
 194
 195         sin = (struct sockaddr_in6 *)ifa->ifa_addr;
 196         if (sin == NULL)
 197                 return;
 198
 199         strlcpy(ifr6.ifr_name, IfName, sizeof(ifr6.ifr_name));
 200         if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 201                 warn("socket(AF_INET6,SOCK_DGRAM)");
 202                 return;
 203         }
 204         ifr6.ifr_addr = *sin;
 205         if (ioctl(s6, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
 206                 warn("ioctl(SIOCGIFAFLAG_IN6)");
 207                 close(s6);
 208                 return;
 209         }
 210         flags6 = ifr6.ifr_ifru.ifru_flags6;
 211         memset(&lifetime, 0, sizeof(lifetime));
 212         ifr6.ifr_addr = *sin;
 213         if (ioctl(s6, SIOCGIFALIFETIME_IN6, &ifr6) < 0) {
 214                 warn("ioctl(SIOCGIFALIFETIME_IN6)");
 215                 close(s6);
 216                 return;
 217         }
 218         lifetime = ifr6.ifr_ifru.ifru_lifetime;
 219         close(s6);
 220
 221         /* XXX: embedded link local addr check */
 222         if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr) &&
 223             *(u_short *)&sin->sin6_addr.s6_addr[2] != 0) {
 224                 u_short index;
 225
 226                 index = *(u_short *)&sin->sin6_addr.s6_addr[2];
 227                 *(u_short *)&sin->sin6_addr.s6_addr[2] = 0;
 228                 if (sin->sin6_scope_id == 0)
 229                         sin->sin6_scope_id = ntohs(index);
 230         }
 231         scopeid = sin->sin6_scope_id;
 232
 233         if (f_addr != NULL && strcmp(f_addr, "fqdn") == 0)
 234                 n_flags = 0;
 235         else if (f_addr != NULL && strcmp(f_addr, "host") == 0)
 236                 n_flags = NI_NOFQDN;
 237         else
 238                 n_flags = NI_NUMERICHOST;
 239
 240         error = getnameinfo((struct sockaddr *)sin, sin->sin6_len, addr_buf,
 241                             sizeof(addr_buf), NULL, 0, n_flags);
 242         if (error != 0)
 243                 inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf,
 244                           sizeof(addr_buf));
 245         printf("\tinet6 %s", addr_buf);
 246
 247         if (ifa->ifa_flags & IFF_POINTOPOINT) {
 248                 sin = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
 249                 /*
 250                  * some of the interfaces do not have valid destination
 251                  * address.
 252                  */
 253                 if (sin != NULL && sin->sin6_family == AF_INET6) {
 254                         /* XXX: embedded link local addr check */
 255                         if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr) &&
 256                             *(u_short *)&sin->sin6_addr.s6_addr[2] != 0) {
 257                                 u_short index;
 258
 259                                 index = *(u_short *)&sin->sin6_addr.s6_addr[2];
 260                                 *(u_short *)&sin->sin6_addr.s6_addr[2] = 0;
 261                                 if (sin->sin6_scope_id == 0)
 262                                         sin->sin6_scope_id = ntohs(index);
 263                         }
 264
 265                         error = getnameinfo((struct sockaddr *)sin,
 266                                             sin->sin6_len, addr_buf,
 267                                             sizeof(addr_buf), NULL, 0,
 268                                             NI_NUMERICHOST);
 269                         if (error != 0)
 270                                 inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf,
 271                                           sizeof(addr_buf));
 272                         printf(" --> %s", addr_buf);
 273                 }
 274         }
 275
 276         sin = (struct sockaddr_in6 *)ifa->ifa_netmask;
 277         if (sin == NULL)
 278                 sin = &null_sin;
 279         prefixlen = prefix(&sin->sin6_addr, sizeof(struct in6_addr));
 280         if (f_inet6 != NULL && strcmp(f_inet6, "cidr") == 0)
 281                 printf("/%d", prefixlen);
 282         else
 283                 printf(" prefixlen %d", prefixlen);
 284
 285         if ((flags6 & IN6_IFF_ANYCAST) != 0)
 286                 printf(" anycast");
 287         if ((flags6 & IN6_IFF_TENTATIVE) != 0)
 288                 printf(" tentative");
 289         if ((flags6 & IN6_IFF_DUPLICATED) != 0)
 290                 printf(" duplicated");
 291         if ((flags6 & IN6_IFF_DETACHED) != 0)
 292                 printf(" detached");
 293         if ((flags6 & IN6_IFF_DEPRECATED) != 0)
 294                 printf(" deprecated");
 295         if ((flags6 & IN6_IFF_AUTOCONF) != 0)
 296                 printf(" autoconf");
 297         if ((flags6 & IN6_IFF_TEMPORARY) != 0)
 298                 printf(" temporary");
 299
 300         if (scopeid)
 301                 printf(" scopeid 0x%x", scopeid);
 302
 303         if (ip6lifetime && (lifetime.ia6t_preferred || lifetime.ia6t_expire)) {
 304                 printf(" pltime");
 305                 if (lifetime.ia6t_preferred) {
 306                         printf(" %s", lifetime.ia6t_preferred < now.tv_sec
 307                                 ? "0" : sec2str(lifetime.ia6t_preferred - now.tv_sec));
 308                 } else {
 309                         printf(" infty");
 310                 }
 311
 312                 printf(" vltime");
 313                 if (lifetime.ia6t_expire) {
 314                         printf(" %s", lifetime.ia6t_expire < now.tv_sec
 315                                 ? "0" : sec2str(lifetime.ia6t_expire - now.tv_sec));
 316                 } else {
 317                         printf(" infty");
 318                 }
 319         }
 320
 321         putchar('\n');
 322 }
 323
 324 #define SIN6(x) ((struct sockaddr_in6 *) &(x))
 325 static struct   sockaddr_in6 *sin6tab[] = {
 326         SIN6(in6_ridreq.ifr_addr), SIN6(in6_addreq.ifra_addr),
 327         SIN6(in6_addreq.ifra_prefixmask), SIN6(in6_addreq.ifra_dstaddr)
 328 };
 329
 330 static void
 331 in6_getprefix(const char *plen, int which)
 332 {
 333         struct sockaddr_in6 *sin = sin6tab[which];
 334         u_char *cp;
 335         int len = atoi(plen);
 336
 337         if ((len < 0) || (len > 128))
 338                 errx(1, "%s: bad value", plen);
 339         sin->sin6_len = sizeof(*sin);
 340         if (which != MASK)
 341                 sin->sin6_family = AF_INET6;
 342         if ((len == 0) || (len == 128)) {
 343                 memset(&sin->sin6_addr, 0xff, sizeof(struct in6_addr));
 344                 return;
 345         }
 346         memset(&sin->sin6_addr, 0x00, sizeof(sin->sin6_addr));
 347         for (cp = (u_char *)&sin->sin6_addr; len > 7; len -= 8)
 348                 *cp++ = 0xff;
 349         *cp = 0xff << (8 - len);
 350 }
 351
 352 static void
 353 in6_getaddr(const char *s, int which)
 354 {
 355         struct sockaddr_in6 *sin = sin6tab[which];
 356         struct addrinfo hints, *res;
 357         int error = -1;
 358
 359         newaddr = true;
 360
 361         sin->sin6_len = sizeof(*sin);
 362         if (which != MASK)
 363                 sin->sin6_family = AF_INET6;
 364
 365         if (which == ADDR) {
 366                 char *p = NULL;
 367                 if((p = strrchr(s, '/')) != NULL) {
 368                         *p = '\0';
 369                         in6_getprefix(p + 1, MASK);
 370                         explicit_prefix = 1;
 371                 }
 372         }
 373
 374         if (sin->sin6_family == AF_INET6) {
 375                 memset(&hints, 0, sizeof(struct addrinfo));
 376                 hints.ai_family = AF_INET6;
 377                 error = getaddrinfo(s, NULL, &hints, &res);
 378         }
 379         if (error != 0) {
 380                 if (inet_pton(AF_INET6, s, &sin->sin6_addr) != 1)
 381                         errx(1, "%s: bad value", s);
 382         } else
 383                 memcpy(sin, res->ai_addr, res->ai_addrlen);
 384 }
 385
 386 static int
 387 prefix(void *val, int size)
 388 {
 389         u_char *name = (u_char *)val;
 390         int byte, bit, plen = 0;
 391
 392         for (byte = 0; byte < size; byte++, plen += 8)
 393                 if (name[byte] != 0xff)
 394                         break;
 395         if (byte == size)
 396                 return (plen);
 397         for (bit = 7; bit != 0; bit--, plen++)
 398                 if (!(name[byte] & (1 << bit)))
 399                         break;
 400         for (; bit != 0; bit--)
 401                 if (name[byte] & (1 << bit))
 402                         return(0);
 403         byte++;
 404         for (; byte < size; byte++)
 405                 if (name[byte])
 406                         return(0);
 407         return (plen);
 408 }
 409
 410 static char *
 411 sec2str(time_t total)
 412 {
 413         static char result[256];
 414         int days, hours, mins, secs;
 415         int first = 1;
 416         char *p = result;
 417
 418         if (0) {
 419                 days = total / 3600 / 24;
 420                 hours = (total / 3600) % 24;
 421                 mins = (total / 60) % 60;
 422                 secs = total % 60;
 423
 424                 if (days) {
 425                         first = 0;
 426                         p += sprintf(p, "%dd", days);
 427                 }
 428                 if (!first || hours) {
 429                         first = 0;
 430                         p += sprintf(p, "%dh", hours);
 431                 }
 432                 if (!first || mins) {
 433                         first = 0;
 434                         p += sprintf(p, "%dm", mins);
 435                 }
 436                 sprintf(p, "%ds", secs);
 437         } else
 438                 sprintf(result, "%lu", (unsigned long)total);
 439
 440         return(result);
 441 }
 442
 443 static void
 444 in6_postproc(int s, const struct afswtch *afp)
 445 {
 446         if (explicit_prefix == 0) {
 447                 /* Aggregatable address architecture defines all prefixes
 448                    are 64. So, it is convenient to set prefixlen to 64 if
 449                    it is not specified. */
 450                 setifprefixlen("64", 0, s, afp);
 451                 /* in6_getprefix("64", MASK) if MASK is available here... */
 452         }
 453 }
 454
 455 static void
 456 in6_status_tunnel(int s)
 457 {
 458         char src[NI_MAXHOST];
 459         char dst[NI_MAXHOST];
 460         struct in6_ifreq in6_ifr;
 461         const struct sockaddr *sa = (const struct sockaddr *) &in6_ifr.ifr_addr;
 462
 463         memset(&in6_ifr, 0, sizeof(in6_ifr));
 464         strlcpy(in6_ifr.ifr_name, IfName, sizeof(in6_ifr.ifr_name));
 465
 466         if (ioctl(s, SIOCGIFPSRCADDR_IN6, &in6_ifr) < 0)
 467                 return;
 468         if (sa->sa_family != AF_INET6)
 469                 return;
 470         in6_fillscopeid(&in6_ifr.ifr_addr);
 471         if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0,
 472             NI_NUMERICHOST) != 0)
 473                 src[0] = '\0';
 474
 475         if (ioctl(s, SIOCGIFPDSTADDR_IN6, &in6_ifr) < 0)
 476                 return;
 477         if (sa->sa_family != AF_INET6)
 478                 return;
 479         in6_fillscopeid(&in6_ifr.ifr_addr);
 480         if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0,
 481             NI_NUMERICHOST) != 0)
 482                 dst[0] = '\0';
 483
 484         printf("\ttunnel inet6 %s --> %s\n", src, dst);
 485 }
 486
 487 static void
 488 in6_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
 489 {
 490         struct in6_aliasreq addreq;
 491
 492         memset(&addreq, 0, sizeof(addreq));
 493         strlcpy(addreq.ifra_name, IfName, sizeof(addreq.ifra_name));
 494         memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
 495         memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);
 496
 497         if (ioctl(s, SIOCSIFPHYADDR_IN6, &addreq) < 0)
 498                 warn("SIOCSIFPHYADDR_IN6");
 499 }
 500
 501 static struct cmd inet6_cmds[] = {
 502         DEF_CMD_ARG("prefixlen",                        setifprefixlen),
 503         DEF_CMD("anycast",      IN6_IFF_ANYCAST,        setip6flags),
 504         DEF_CMD("tentative",    IN6_IFF_TENTATIVE,      setip6flags),
 505         DEF_CMD("-tentative",   -IN6_IFF_TENTATIVE,     setip6flags),
 506         DEF_CMD("deprecated",   IN6_IFF_DEPRECATED,     setip6flags),
 507         DEF_CMD("-deprecated", -IN6_IFF_DEPRECATED,     setip6flags),
 508         DEF_CMD("autoconf",     IN6_IFF_AUTOCONF,       setip6flags),
 509         DEF_CMD("-autoconf",    -IN6_IFF_AUTOCONF,      setip6flags),
 510         DEF_CMD_ARG("pltime",                           setip6pltime),
 511         DEF_CMD_ARG("vltime",                           setip6vltime),
 512         DEF_CMD("eui64",        0,                      setip6eui64),
 513 };
 514
 515 static struct afswtch af_inet6 = {
 516         .af_name        = "inet6",
 517         .af_af          = AF_INET6,
 518         .af_status      = in6_status,
 519         .af_getaddr     = in6_getaddr,
 520         .af_getprefix   = in6_getprefix,
 521         .af_postproc    = in6_postproc,
 522         .af_status_tunnel = in6_status_tunnel,
 523         .af_settunnel   = in6_set_tunnel,
 524         .af_difaddr     = SIOCDIFADDR_IN6,
 525         .af_aifaddr     = SIOCAIFADDR_IN6,
 526         .af_ridreq      = &in6_ridreq,
 527         .af_addreq      = &in6_addreq,
 528 };
 529
 530 static void
 531 in6_Lopt_cb(const char *arg __unused)
 532 {
 533         ip6lifetime++;  /* print IPv6 address lifetime */
 534 }
 535 static struct option in6_Lopt = { "L", "[-L]", in6_Lopt_cb, NULL };
 536
 537 __constructor(113)
 538 static void
 539 inet6_ctor(void)
 540 {
 541         size_t i;
 542
 543         for (i = 0; i < nitems(inet6_cmds);  i++)
 544                 cmd_register(&inet6_cmds[i]);
 545
 546         af_register(&af_inet6);
 547         opt_register(&in6_Lopt);
 548 }