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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# add private ipv4 and ipv6 addresses to loopback
readonly V6_INNER='100::a/128'
readonly V4_INNER='192.168.0.1/32'
if getopts ":s" opt; then
readonly SIT_DEV_NAME='sixtofourtest0'
readonly V6_SIT='2::/64'
readonly V4_SIT='172.17.0.1/32'
shift
fi
fail() {
echo "error: $*" 1>&2
exit 1
}
setup() {
ip -6 addr add "${V6_INNER}" dev lo || fail 'failed to setup v6 address'
ip -4 addr add "${V4_INNER}" dev lo || fail 'failed to setup v4 address'
if [[ -n "${V6_SIT}" ]]; then
ip link add "${SIT_DEV_NAME}" type sit remote any local any \
|| fail 'failed to add sit'
ip link set dev "${SIT_DEV_NAME}" up \
|| fail 'failed to bring sit device up'
ip -6 addr add "${V6_SIT}" dev "${SIT_DEV_NAME}" \
|| fail 'failed to setup v6 SIT address'
ip -4 addr add "${V4_SIT}" dev "${SIT_DEV_NAME}" \
|| fail 'failed to setup v4 SIT address'
fi
sleep 2 # avoid race causing bind to fail
}
cleanup() {
if [[ -n "${V6_SIT}" ]]; then
ip -4 addr del "${V4_SIT}" dev "${SIT_DEV_NAME}"
ip -6 addr del "${V6_SIT}" dev "${SIT_DEV_NAME}"
ip link del "${SIT_DEV_NAME}"
fi
ip -4 addr del "${V4_INNER}" dev lo
ip -6 addr del "${V6_INNER}" dev lo
}
trap cleanup EXIT
setup
"$@"
exit "$?"
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