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aiccu_linux.c

/**********************************************************
 SixXS - Automatic IPv6 Connectivity Configuration Utility
***********************************************************
 Copyright 2003-2005 SixXS - http://www.sixxs.net
***********************************************************
 common/aiccu_linux.c - AICCU Linux Abstracted functions
***********************************************************
 $Author: jeroen $
 $Id: aiccu_linux.c,v 1.15 2007-01-15 12:18:58 jeroen Exp $
 $Date: 2007-01-15 12:18:58 $
**********************************************************/

#include "aiccu.h"

bool aiccu_os_install(void)
{
      /* Check if IPv6 support is available */
      if (access("/proc/net/if_inet6", F_OK))
      {
            /* Doing the modprobe doesn't guarantee success unfortunately */
            (void)system("modprobe -q ipv6 2>/dev/null >/dev/null");

            /* Thus test it again */
            if (access("/proc/net/if_inet6", F_OK))
            {
                  dolog(LOG_ERR, "No IPv6 Stack found! Please check your kernel and module configuration\n");
                  return false;
            }
      }

      /* Try to load modules (SIT tunnel, TUN/TAP)
       * They can be kernel builtins and there is no easy
       * way to check if they are loaded/built except for
       * trying to use them and fail at that point
       */
      (void)system("modprobe -q sit 2>/dev/null >/dev/null");
      (void)system("modprobe -q tun 2>/dev/null >/dev/null");

      return true;
}

bool aiccu_os_setup(struct TIC_Tunnel *hTunnel)
{
      if (hTunnel->uses_tundev == 0)
      {
            aiccu_exec(
                  "ip tunnel add %s mode sit %s%s remote %s",
                  g_aiccu->ipv6_interface,
                  strcmp(hTunnel->sIPv4_Local, "heartbeat") == 0 ? "" : "local ",
                  strcmp(hTunnel->sIPv4_Local, "heartbeat") == 0 ? "" : hTunnel->sIPv4_Local,
                  hTunnel->sIPv4_POP);
      }

      aiccu_exec(
            "ip link set %s up",
            g_aiccu->ipv6_interface);

      aiccu_exec(
            "ip link set mtu %u dev %s",
            hTunnel->nMTU,
            g_aiccu->ipv6_interface);

      if (hTunnel->uses_tundev == 0)
      {
            aiccu_exec(
                  "ip tunnel change %s ttl 64",
                  g_aiccu->ipv6_interface);
      }
      else
      {
            /* Add a LinkLocal address for AYIYA tunnels */
            aiccu_exec(
                  "ip -6 addr add %s/%u dev %s",
                  hTunnel->sIPv6_LinkLocal,
                  64,
                  g_aiccu->ipv6_interface);
      }

      aiccu_exec(
            "ip -6 addr add %s/%u dev %s",
            hTunnel->sIPv6_Local,
            hTunnel->nIPv6_PrefixLength,
            g_aiccu->ipv6_interface);

      if (g_aiccu->defaultroute)
      {
            aiccu_exec(
                  "ip -6 ro add %s via %s dev %s",
                  "default",
                  hTunnel->sIPv6_POP,
                  g_aiccu->ipv6_interface);
      }

      return true;
}

void aiccu_os_reconfig(struct TIC_Tunnel *hTunnel)
{
      if (hTunnel->uses_tundev == 0)
      {
            aiccu_exec(
                  "ip tunnel change %s local %s",
                  g_aiccu->ipv6_interface,
                  hTunnel->sIPv4_Local);
      }
}

void aiccu_os_delete(struct TIC_Tunnel *hTunnel)
{
      hTunnel = hTunnel;
      aiccu_exec(
            "ip link set %s down",
            g_aiccu->ipv6_interface);

      if (hTunnel->uses_tundev == 0)
      {
            aiccu_exec(
                  "ip tunnel del %s",
                  g_aiccu->ipv6_interface);
      }
}


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