#!/bin/sh
#----------------------------------------------------------------------------
# /etc/rc.d/circuits.tun6in4 - 6in4 tunnel circuits
#
# Last Update:  $Id$
#----------------------------------------------------------------------------

ipv6_pops_file=/var/run/ipv6.pops

>> $ipv6_pops_file

# $1 = circuit information file
# $2 = variable receiving an error message (if any)
tun6in4_circuit_add()
{
    circuit_allocate_device $circ_tun6in4_type circ_alias

    circ_dev=$circ_alias
    circ_newif=yes

    # call 6in4 type dependent add function
    local func="tun6in4_${circ_tun6in4_type//-/_}_circuit_add"
    if type $func >/dev/null 2>&1 && ! $func $1 $2
    then
        return 1
    fi

    # according to RFC 2460, this MTU must always work
    local circ_tun6in4_mtu=${circ_tun6in4_mtu:-1280}

    case $circ_tun6in4_localv4 in
    dynamic)
        circ_tun6in4_localv4="127.0.0.1"
        echo $circ_id >> /var/run/ipv6.dyntunnels
        ;;
    127.*.*.*)
        echo $circ_id >> /var/run/ipv6.dyntunnels
        ;;
    esac

    echo "$circ_tun6in4_remotev4" >> $ipv6_pops_file

    ip tunnel add name $circ_dev mode sit local $circ_tun6in4_localv4 remote $circ_tun6in4_remotev4 ttl 64
    echo 0 > /proc/sys/net/ipv6/conf/$circ_dev/disable_ipv6
    ip link set dev $circ_dev mtu $circ_tun6in4_mtu up

    cat >> $1 <<EOF
circ_tun6in4_type=$circ_tun6in4_type
circ_tun6in4_localv4=$circ_tun6in4_localv4
circ_tun6in4_remotev4=$circ_tun6in4_remotev4
circ_tun6in4_mtu=$circ_tun6in4_mtu
EOF

    return 0
}

# $1 = circuit information file
# $2 = variable receiving an error message (if any)
tun6in4_static_circuit_add()
{
    cat >> $1 <<EOF
circ_tun6in4_static_localv6=$circ_tun6in4_static_localv6
circ_tun6in4_static_remotev6=$circ_tun6in4_static_remotev6
circ_tun6in4_static_prefix=$circ_tun6in4_static_prefix
EOF
}

# $1 = circuit information file
# $2 = variable receiving an error message (if any)
tun6in4_he_circuit_add()
{
    local tun6in4_he_password_md5=$(echo -n "$circ_tun6in4_he_password" | md5sum | cut -d ' ' -f 1)

    cat >> $1 <<EOF
circ_tun6in4_he_localv6=$circ_tun6in4_he_localv6
circ_tun6in4_he_remotev6=$circ_tun6in4_he_remotev6
circ_tun6in4_he_prefix=$circ_tun6in4_he_prefix
circ_tun6in4_he_userid="$circ_tun6in4_he_userid"
circ_tun6in4_he_password="$circ_tun6in4_he_password"
circ_tun6in4_he_tunnelid="$circ_tun6in4_he_tunnelid"
tun6in4_he_password_md5="$tun6in4_he_password_md5"
EOF

    return 0
}