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if.c

/*    $KAME: if.c,v 1.6 2005/09/16 11:30:15 suz Exp $ */

/*
 * Copyright (C) 2002 WIDE Project.
 * 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.
 * 3. Neither the name of the project 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 PROJECT 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 PROJECT 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.
 */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/queue.h>

#include <net/if.h>
#include <netinet/in.h>
#ifdef __KAME__
#include <net/if_dl.h>
#endif

#include <syslog.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ifaddrs.h>
#include <errno.h>

#include <dhcp6.h>
#include <config.h>
#include <common.h>

extern int errno;

struct dhcp6_if *dhcp6_if;

struct dhcp6_if *
ifinit(ifname)
      char *ifname;
{
      struct dhcp6_if *ifp;

      if ((ifp = find_ifconfbyname(ifname)) != NULL) {
            dprintf(LOG_NOTICE, FNAME, "duplicated interface: %s", ifname);
            return (NULL);
      }

      if ((ifp = malloc(sizeof(*ifp))) == NULL) {
            dprintf(LOG_ERR, FNAME, "malloc failed");
            goto fail;
      }
      memset(ifp, 0, sizeof(*ifp));

      TAILQ_INIT(&ifp->event_list);

      if ((ifp->ifname = strdup(ifname)) == NULL) {
            dprintf(LOG_ERR, FNAME, "failed to copy ifname");
            goto fail;
      }

      if (ifreset(ifp))
            goto fail;

      TAILQ_INIT(&ifp->reqopt_list);
      TAILQ_INIT(&ifp->iaconf_list);

      ifp->authproto = DHCP6_AUTHPROTO_UNDEF;
      ifp->authalgorithm = DHCP6_AUTHALG_UNDEF;
      ifp->authrdm = DHCP6_AUTHRDM_UNDEF;

      ifp->next = dhcp6_if;
      dhcp6_if = ifp;
      return (ifp);

  fail:
      if (ifp->ifname != NULL)
            free(ifp->ifname);
      free(ifp);
      return (NULL);
}

int
ifreset(ifp)
      struct dhcp6_if *ifp;
{
      unsigned int ifid;
      u_int32_t linkid;

      if ((ifid = if_nametoindex(ifp->ifname)) == 0) {
            dprintf(LOG_ERR, FNAME, "invalid interface(%s): %s",
                  ifp->ifname, strerror(errno));
            return (-1);
      }

#ifdef HAVE_SCOPELIB
      if (inet_zoneid(AF_INET6, 2, ifname, &linkid)) {
            dprintf(LOG_ERR, FNAME, "failed to get link ID for %s",
                ifname);
            return (-1);
      }
#else
      linkid = ifid;          /* XXX: assume 1to1 mapping IFs and links */
#endif

      ifp->ifid = ifid;
      ifp->linkid = linkid;

      return (0);
}

struct dhcp6_if *
find_ifconfbyname(ifname)
      char *ifname;
{
      struct dhcp6_if *ifp;

      for (ifp = dhcp6_if; ifp; ifp = ifp->next) {
            if (strcmp(ifp->ifname, ifname) == 0)
                  return (ifp);
      }

      return (NULL);
}

struct dhcp6_if *
find_ifconfbyid(id)
      unsigned int id;
{
      struct dhcp6_if *ifp;

      for (ifp = dhcp6_if; ifp; ifp = ifp->next) {
            if (ifp->ifid == id)
                  return (ifp);
      }

      return (NULL);
}

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