#!/bin/bash
# Copyright 2015 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

ip6tables -P INPUT DROP -w
ip6tables -P FORWARD DROP -w
ip6tables -P OUTPUT DROP -w

# Accept everything on the loopback
ip6tables -A INPUT -i lo -j ACCEPT -w
ip6tables -A OUTPUT -o lo -j ACCEPT -w

# Accept icmp echo (NB: icmp echo ratelimiting is done by the kernel)
ip6tables -A INPUT -p icmpv6 -j ACCEPT -w
ip6tables -A OUTPUT -p icmpv6 -j ACCEPT -w

# Accept return traffic inbound
ip6tables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -w

# Accept new and return traffic outbound
ip6tables -A OUTPUT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT -w

# Allow DHCPv6 client inbound
ip6tables -A INPUT -p udp -m udp --dport 546 -j ACCEPT -w