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Sourcecode: freebsd-utils version File versions

af_inet6.c

/*
 * Copyright (c) 1983, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char rcsid[] =
  "$FreeBSD: src/sbin/ifconfig/af_inet6.c,v 1.6.6.1 2008/11/25 02:59:29 kensmith Exp $";
#endif /* not lint */

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ifaddrs.h>

#include <arpa/inet.h>

#include <netinet/in.h>
#include <net/if_var.h>       /* for struct ifaddr */
#include <netinet/in_var.h>
#include <arpa/inet.h>
#include <netdb.h>

#include <netinet6/nd6.h>     /* Define ND6_INFINITE_LIFETIME */

#include "ifconfig.h"

static      struct in6_ifreq in6_ridreq;
static      struct in6_aliasreq in6_addreq = 
  { { 0 }, 
    { 0 }, 
    { 0 }, 
    { 0 }, 
    0, 
    { 0, 0, ND6_INFINITE_LIFETIME, ND6_INFINITE_LIFETIME } };
static      int ip6lifetime;

static      void in6_fillscopeid(struct sockaddr_in6 *sin6);
static      int prefix(void *, int);
static      char *sec2str(time_t);
static      int explicit_prefix = 0;

static      char addr_buf[MAXHOSTNAMELEN *2 + 1];     /*for getnameinfo()*/

static void
setifprefixlen(const char *addr, int dummy __unused, int s,
    const struct afswtch *afp)
{
        if (afp->af_getprefix != NULL)
                afp->af_getprefix(addr, MASK);
      explicit_prefix = 1;
}

static void
setip6flags(const char *dummyaddr __unused, int flag, int dummysoc __unused,
    const struct afswtch *afp)
{
      if (afp->af_af != AF_INET6)
            err(1, "address flags can be set only for inet6 addresses");

      if (flag < 0)
            in6_addreq.ifra_flags &= ~(-flag);
      else
            in6_addreq.ifra_flags |= flag;
}

static void
setip6lifetime(const char *cmd, const char *val, int s, 
    const struct afswtch *afp)
{
      time_t newval, t;
      char *ep;

      t = time(NULL);
      newval = (time_t)strtoul(val, &ep, 0);
      if (val == ep)
            errx(1, "invalid %s", cmd);
      if (afp->af_af != AF_INET6)
            errx(1, "%s not allowed for the AF", cmd);
      if (strcmp(cmd, "vltime") == 0) {
            in6_addreq.ifra_lifetime.ia6t_expire = t + newval;
            in6_addreq.ifra_lifetime.ia6t_vltime = newval;
      } else if (strcmp(cmd, "pltime") == 0) {
            in6_addreq.ifra_lifetime.ia6t_preferred = t + newval;
            in6_addreq.ifra_lifetime.ia6t_pltime = newval;
      }
}

static void
setip6pltime(const char *seconds, int dummy __unused, int s, 
    const struct afswtch *afp)
{
      setip6lifetime("pltime", seconds, s, afp);
}

static void
setip6vltime(const char *seconds, int dummy __unused, int s, 
    const struct afswtch *afp)
{
      setip6lifetime("vltime", seconds, s, afp);
}

static void
setip6eui64(const char *cmd, int dummy __unused, int s,
    const struct afswtch *afp)
{
      struct ifaddrs *ifap, *ifa;
      const struct sockaddr_in6 *sin6 = NULL;
      const struct in6_addr *lladdr = NULL;
      struct in6_addr *in6;

      if (afp->af_af != AF_INET6)
            errx(EXIT_FAILURE, "%s not allowed for the AF", cmd);
      in6 = (struct in6_addr *)&in6_addreq.ifra_addr.sin6_addr;
      if (memcmp(&in6addr_any.s6_addr[8], &in6->s6_addr[8], 8) != 0)
            errx(EXIT_FAILURE, "interface index is already filled");
      if (getifaddrs(&ifap) != 0)
            err(EXIT_FAILURE, "getifaddrs");
      for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
            if (ifa->ifa_addr->sa_family == AF_INET6 &&
                strcmp(ifa->ifa_name, name) == 0) {
                  sin6 = (const struct sockaddr_in6 *)ifa->ifa_addr;
                  if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
                        lladdr = &sin6->sin6_addr;
                        break;
                  }
            }
      }
      if (!lladdr)
            errx(EXIT_FAILURE, "could not determine link local address"); 

      memcpy(&in6->s6_addr[8], &lladdr->s6_addr[8], 8);

      freeifaddrs(ifap);
}

static void
in6_fillscopeid(struct sockaddr_in6 *sin6)
{
#if defined(__KAME__) && defined(KAME_SCOPEID)
      if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
            sin6->sin6_scope_id =
                  ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
            sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0;
      }
#endif
}

static void
in6_status(int s __unused, const struct ifaddrs *ifa)
{
      struct sockaddr_in6 *sin, null_sin;
      struct in6_ifreq ifr6;
      int s6;
      u_int32_t flags6;
      struct in6_addrlifetime lifetime;
      time_t t = time(NULL);
      int error;
      u_int32_t scopeid;

      memset(&null_sin, 0, sizeof(null_sin));

      sin = (struct sockaddr_in6 *)ifa->ifa_addr;
      if (sin == NULL)
            return;

      strncpy(ifr6.ifr_name, ifr.ifr_name, sizeof(ifr.ifr_name));
      if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
            warn("socket(AF_INET6,SOCK_DGRAM)");
            return;
      }
      ifr6.ifr_addr = *sin;
      if (ioctl(s6, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
            warn("ioctl(SIOCGIFAFLAG_IN6)");
            close(s6);
            return;
      }
      flags6 = ifr6.ifr_ifru.ifru_flags6;
      memset(&lifetime, 0, sizeof(lifetime));
      ifr6.ifr_addr = *sin;
      if (ioctl(s6, SIOCGIFALIFETIME_IN6, &ifr6) < 0) {
            warn("ioctl(SIOCGIFALIFETIME_IN6)");
            close(s6);
            return;
      }
      lifetime = ifr6.ifr_ifru.ifru_lifetime;
      close(s6);

      /* XXX: embedded link local addr check */
      if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr) &&
          *(u_short *)&sin->sin6_addr.s6_addr[2] != 0) {
            u_short index;

            index = *(u_short *)&sin->sin6_addr.s6_addr[2];
            *(u_short *)&sin->sin6_addr.s6_addr[2] = 0;
            if (sin->sin6_scope_id == 0)
                  sin->sin6_scope_id = ntohs(index);
      }
      scopeid = sin->sin6_scope_id;

      error = getnameinfo((struct sockaddr *)sin, sin->sin6_len, addr_buf,
                      sizeof(addr_buf), NULL, 0, NI_NUMERICHOST);
      if (error != 0)
            inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf,
                    sizeof(addr_buf));
      printf("\tinet6 %s ", addr_buf);

      if (ifa->ifa_flags & IFF_POINTOPOINT) {
            sin = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
            /*
             * some of the interfaces do not have valid destination
             * address.
             */
            if (sin != NULL && sin->sin6_family == AF_INET6) {
                  int error;

                  /* XXX: embedded link local addr check */
                  if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr) &&
                      *(u_short *)&sin->sin6_addr.s6_addr[2] != 0) {
                        u_short index;

                        index = *(u_short *)&sin->sin6_addr.s6_addr[2];
                        *(u_short *)&sin->sin6_addr.s6_addr[2] = 0;
                        if (sin->sin6_scope_id == 0)
                              sin->sin6_scope_id = ntohs(index);
                  }

                  error = getnameinfo((struct sockaddr *)sin,
                                  sin->sin6_len, addr_buf,
                                  sizeof(addr_buf), NULL, 0,
                                  NI_NUMERICHOST);
                  if (error != 0)
                        inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf,
                                sizeof(addr_buf));
                  printf("--> %s ", addr_buf);
            }
      }

      sin = (struct sockaddr_in6 *)ifa->ifa_netmask;
      if (sin == NULL)
            sin = &null_sin;
      printf("prefixlen %d ", prefix(&sin->sin6_addr,
            sizeof(struct in6_addr)));

      if ((flags6 & IN6_IFF_ANYCAST) != 0)
            printf("anycast ");
      if ((flags6 & IN6_IFF_TENTATIVE) != 0)
            printf("tentative ");
      if ((flags6 & IN6_IFF_DUPLICATED) != 0)
            printf("duplicated ");
      if ((flags6 & IN6_IFF_DETACHED) != 0)
            printf("detached ");
      if ((flags6 & IN6_IFF_DEPRECATED) != 0)
            printf("deprecated ");
      if ((flags6 & IN6_IFF_AUTOCONF) != 0)
            printf("autoconf ");
      if ((flags6 & IN6_IFF_TEMPORARY) != 0)
            printf("temporary ");

        if (scopeid)
            printf("scopeid 0x%x ", scopeid);

      if (ip6lifetime && (lifetime.ia6t_preferred || lifetime.ia6t_expire)) {
            printf("pltime ");
            if (lifetime.ia6t_preferred) {
                  printf("%s ", lifetime.ia6t_preferred < t
                        ? "0" : sec2str(lifetime.ia6t_preferred - t));
            } else
                  printf("infty ");

            printf("vltime ");
            if (lifetime.ia6t_expire) {
                  printf("%s ", lifetime.ia6t_expire < t
                        ? "0" : sec2str(lifetime.ia6t_expire - t));
            } else
                  printf("infty ");
      }

      putchar('\n');
}

#define     SIN6(x) ((struct sockaddr_in6 *) &(x))
static struct     sockaddr_in6 *sin6tab[] = {
      SIN6(in6_ridreq.ifr_addr), SIN6(in6_addreq.ifra_addr),
      SIN6(in6_addreq.ifra_prefixmask), SIN6(in6_addreq.ifra_dstaddr)
};

static void
in6_getprefix(const char *plen, int which)
{
      struct sockaddr_in6 *sin = sin6tab[which];
      u_char *cp;
      int len = atoi(plen);

      if ((len < 0) || (len > 128))
            errx(1, "%s: bad value", plen);
      sin->sin6_len = sizeof(*sin);
      if (which != MASK)
            sin->sin6_family = AF_INET6;
      if ((len == 0) || (len == 128)) {
            memset(&sin->sin6_addr, 0xff, sizeof(struct in6_addr));
            return;
      }
      memset((void *)&sin->sin6_addr, 0x00, sizeof(sin->sin6_addr));
      for (cp = (u_char *)&sin->sin6_addr; len > 7; len -= 8)
            *cp++ = 0xff;
      *cp = 0xff << (8 - len);
}

static void
in6_getaddr(const char *s, int which)
{
      struct sockaddr_in6 *sin = sin6tab[which];
      struct addrinfo hints, *res;
      int error = -1;

      newaddr &= 1;

      sin->sin6_len = sizeof(*sin);
      if (which != MASK)
            sin->sin6_family = AF_INET6;

      if (which == ADDR) {
            char *p = NULL;
            if((p = strrchr(s, '/')) != NULL) {
                  *p = '\0';
                  in6_getprefix(p + 1, MASK);
                  explicit_prefix = 1;
            }
      }

      if (sin->sin6_family == AF_INET6) {
            bzero(&hints, sizeof(struct addrinfo));
            hints.ai_family = AF_INET6;
            error = getaddrinfo(s, NULL, &hints, &res);
      }
      if (error != 0) {
            if (inet_pton(AF_INET6, s, &sin->sin6_addr) != 1)
                  errx(1, "%s: bad value", s);
      } else
            bcopy(res->ai_addr, sin, res->ai_addrlen);
}

static int
prefix(void *val, int size)
{
        u_char *name = (u_char *)val;
        int byte, bit, plen = 0;

        for (byte = 0; byte < size; byte++, plen += 8)
                if (name[byte] != 0xff)
                        break;
      if (byte == size)
            return (plen);
      for (bit = 7; bit != 0; bit--, plen++)
                if (!(name[byte] & (1 << bit)))
                        break;
        for (; bit != 0; bit--)
                if (name[byte] & (1 << bit))
                        return(0);
        byte++;
        for (; byte < size; byte++)
                if (name[byte])
                        return(0);
        return (plen);
}

static char *
sec2str(time_t total)
{
      static char result[256];
      int days, hours, mins, secs;
      int first = 1;
      char *p = result;

      if (0) {
            days = total / 3600 / 24;
            hours = (total / 3600) % 24;
            mins = (total / 60) % 60;
            secs = total % 60;

            if (days) {
                  first = 0;
                  p += sprintf(p, "%dd", days);
            }
            if (!first || hours) {
                  first = 0;
                  p += sprintf(p, "%dh", hours);
            }
            if (!first || mins) {
                  first = 0;
                  p += sprintf(p, "%dm", mins);
            }
            sprintf(p, "%ds", secs);
      } else
            sprintf(result, "%lu", (unsigned long)total);

      return(result);
}

static void
in6_postproc(int s, const struct afswtch *afp)
{
      if (explicit_prefix == 0) {
            /* Aggregatable address architecture defines all prefixes
               are 64. So, it is convenient to set prefixlen to 64 if
               it is not specified. */
            setifprefixlen("64", 0, s, afp);
            /* in6_getprefix("64", MASK) if MASK is available here... */
      }
}

static void
in6_status_tunnel(int s)
{
      char src[NI_MAXHOST];
      char dst[NI_MAXHOST];
      struct in6_ifreq in6_ifr;
      const struct sockaddr *sa = (const struct sockaddr *) &in6_ifr.ifr_addr;

      memset(&in6_ifr, 0, sizeof(in6_ifr));
      strncpy(in6_ifr.ifr_name, name, IFNAMSIZ);

      if (ioctl(s, SIOCGIFPSRCADDR_IN6, (caddr_t)&in6_ifr) < 0)
            return;
      if (sa->sa_family != AF_INET6)
            return;
      in6_fillscopeid(&in6_ifr.ifr_addr);
      if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0,
          NI_NUMERICHOST) != 0)
            src[0] = '\0';

      if (ioctl(s, SIOCGIFPDSTADDR_IN6, (caddr_t)&in6_ifr) < 0)
            return;
      if (sa->sa_family != AF_INET6)
            return;
      in6_fillscopeid(&in6_ifr.ifr_addr);
      if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0,
          NI_NUMERICHOST) != 0)
            dst[0] = '\0';

      printf("\ttunnel inet6 %s --> %s\n", src, dst);
}

static void
in6_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
{
      struct in6_aliasreq in6_addreq; 

      memset(&in6_addreq, 0, sizeof(in6_addreq));
      strncpy(in6_addreq.ifra_name, name, IFNAMSIZ);
      memcpy(&in6_addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
      memcpy(&in6_addreq.ifra_dstaddr, dstres->ai_addr,
          dstres->ai_addr->sa_len);

      if (ioctl(s, SIOCSIFPHYADDR_IN6, &in6_addreq) < 0)
            warn("SIOCSIFPHYADDR_IN6");
}

static struct cmd inet6_cmds[] = {
      DEF_CMD_ARG("prefixlen",                  setifprefixlen),
      DEF_CMD("anycast",      IN6_IFF_ANYCAST,  setip6flags),
      DEF_CMD("tentative",    IN6_IFF_TENTATIVE,      setip6flags),
      DEF_CMD("-tentative",   -IN6_IFF_TENTATIVE,     setip6flags),
      DEF_CMD("deprecated",   IN6_IFF_DEPRECATED,     setip6flags),
      DEF_CMD("-deprecated", -IN6_IFF_DEPRECATED,     setip6flags),
      DEF_CMD("autoconf",     IN6_IFF_AUTOCONF, setip6flags),
      DEF_CMD("-autoconf",    -IN6_IFF_AUTOCONF,      setip6flags),
      DEF_CMD_ARG("pltime",                     setip6pltime),
      DEF_CMD_ARG("vltime",                     setip6vltime),
      DEF_CMD("eui64",  0,                setip6eui64),
};

static struct afswtch af_inet6 = {
      .af_name    = "inet6",
      .af_af            = AF_INET6,
      .af_status  = in6_status,
      .af_getaddr = in6_getaddr,
      .af_getprefix     = in6_getprefix,
      .af_postproc      = in6_postproc,
      .af_status_tunnel = in6_status_tunnel,
      .af_settunnel     = in6_set_tunnel,
      .af_difaddr = SIOCDIFADDR_IN6,
      .af_aifaddr = SIOCAIFADDR_IN6,
      .af_ridreq  = &in6_addreq,
      .af_addreq  = &in6_addreq,
};

static void
in6_Lopt_cb(const char *optarg __unused)
{
      ip6lifetime++;    /* print IPv6 address lifetime */
}
static struct option in6_Lopt = { "L", "[-L]", in6_Lopt_cb };

static __constructor void
inet6_ctor(void)
{
#define     N(a)  (sizeof(a) / sizeof(a[0]))
      int i;

      for (i = 0; i < N(inet6_cmds);  i++)
            cmd_register(&inet6_cmds[i]);
      af_register(&af_inet6);
      opt_register(&in6_Lopt);
#undef N
}

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