#!/bin/bash
#
#  Copyright (c) 2017, The OpenThread Authors.
#  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 copyright holder 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
#
#   Description:
#       This script manipulates ip forward configuration.
#

SYSCTL_IP_FORWARD=/etc/sysctl.d/60-otbr-ip-forward.conf

ipforward_install()
{
    sudo tee $SYSCTL_IP_FORWARD <<EOF
net.ipv6.conf.all.forwarding = 1
net.ipv4.ip_forward = 1
EOF

    # /proc/sys/net/ipv6/conf/* files are read-only in docker
    # when building the image.
    if without DOCKER; then
        ipforward_enable
    fi
}

ipforward_uninstall()
{
    test ! -f $SYSCTL_IP_FORWARD || sudo rm -v $SYSCTL_IP_FORWARD
}

ipforward_enable()
{
    echo 1 | sudo tee /proc/sys/net/ipv6/conf/all/forwarding || die 'Failed to enable IPv6 forwarding!'
    echo 1 | sudo tee /proc/sys/net/ipv4/ip_forward || die 'Failed to enable IPv4 forwarding!'
}
