release/src/router/dhcpv6/if.c

   1 /*      $KAME: if.c,v 1.6 2005/09/16 11:30:15 suz Exp $ */
   2
   3 /*
   4  * Copyright (C) 2002 WIDE Project.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33 #include <sys/queue.h>
  34
  35 #include <net/if.h>
  36 #include <netinet/in.h>
  37 #ifdef __KAME__
  38 #include <net/if_dl.h>
  39 #endif
  40
  41 #include <syslog.h>
  42 #include <stdlib.h>
  43 #include <stdio.h>
  44 #include <string.h>
  45 #include <ifaddrs.h>
  46 #include <errno.h>
  47
  48 #include <dhcp6.h>
  49 #include <config.h>
  50 #include <common.h>
  51
  52 extern int errno;
  53
  54 struct dhcp6_if *dhcp6_if;
  55
  56 struct dhcp6_if *
  57 ifinit(ifname)
  58         char *ifname;
  59 {
  60         struct dhcp6_if *ifp;
  61
  62         if ((ifp = find_ifconfbyname(ifname)) != NULL) {
  63                 dprintf(LOG_NOTICE, FNAME, "duplicated interface: %s", ifname);
  64                 return (NULL);
  65         }
  66
  67         if ((ifp = malloc(sizeof(*ifp))) == NULL) {
  68                 dprintf(LOG_ERR, FNAME, "malloc failed");
  69                 goto fail;
  70         }
  71         memset(ifp, 0, sizeof(*ifp));
  72
  73         TAILQ_INIT(&ifp->event_list);
  74
  75         if ((ifp->ifname = strdup(ifname)) == NULL) {
  76                 dprintf(LOG_ERR, FNAME, "failed to copy ifname");
  77                 goto fail;
  78         }
  79
  80         if (ifreset(ifp))
  81                 goto fail;
  82
  83         TAILQ_INIT(&ifp->reqopt_list);
  84         TAILQ_INIT(&ifp->iaconf_list);
  85
  86         ifp->authproto = DHCP6_AUTHPROTO_UNDEF;
  87         ifp->authalgorithm = DHCP6_AUTHALG_UNDEF;
  88         ifp->authrdm = DHCP6_AUTHRDM_UNDEF;
  89
  90         {
  91                 struct ifaddrs *ifa, *ifap;
  92                 struct sockaddr_in6 *sin6;
  93
  94                 if (getifaddrs(&ifap) < 0) {
  95                         dprintf(LOG_ERR, FNAME, "getifaddrs failed: %s",
  96                             strerror(errno));
  97                         goto fail;
  98                 }
  99
 100                 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 101                         if (strcmp(ifa->ifa_name, ifname) != 0)
 102                                 continue;
 103                         if (ifa->ifa_addr == NULL)
 104                                 continue;
 105                         if (ifa->ifa_addr->sa_family != AF_INET6)
 106                                 continue;
 107
 108                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 109                         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
 110                                 continue;
 111
 112                         ifp->addr = sin6->sin6_addr;
 113                 }
 114
 115                 freeifaddrs(ifap);
 116         }
 117
 118         ifp->next = dhcp6_if;
 119         dhcp6_if = ifp;
 120         return (ifp);
 121
 122   fail:
 123         if (ifp->ifname != NULL)
 124                 free(ifp->ifname);
 125         free(ifp);
 126         return (NULL);
 127 }
 128
 129 int
 130 ifreset(ifp)
 131         struct dhcp6_if *ifp;
 132 {
 133         unsigned int ifid;
 134         u_int32_t linkid;
 135
 136         if ((ifid = if_nametoindex(ifp->ifname)) == 0) {
 137                 dprintf(LOG_ERR, FNAME, "invalid interface(%s): %s",
 138                         ifp->ifname, strerror(errno));
 139                 return (-1);
 140         }
 141
 142 #ifdef HAVE_SCOPELIB
 143         if (inet_zoneid(AF_INET6, 2, ifname, &linkid)) {
 144                 dprintf(LOG_ERR, FNAME, "failed to get link ID for %s",
 145                     ifname);
 146                 return (-1);
 147         }
 148 #else
 149         linkid = ifid;          /* XXX: assume 1to1 mapping IFs and links */
 150 #endif
 151
 152         ifp->ifid = ifid;
 153         ifp->linkid = linkid;
 154
 155         return (0);
 156 }
 157
 158 struct dhcp6_if *
 159 find_ifconfbyname(ifname)
 160         char *ifname;
 161 {
 162         struct dhcp6_if *ifp;
 163
 164         for (ifp = dhcp6_if; ifp; ifp = ifp->next) {
 165                 if (strcmp(ifp->ifname, ifname) == 0)
 166                         return (ifp);
 167         }
 168
 169         return (NULL);
 170 }
 171
 172 struct dhcp6_if *
 173 find_ifconfbyid(id)
 174         unsigned int id;
 175 {
 176         struct dhcp6_if *ifp;
 177
 178         for (ifp = dhcp6_if; ifp; ifp = ifp->next) {
 179                 if (ifp->ifid == id)
 180                         return (ifp);
 181         }
 182
 183         return (NULL);
 184 }