ip-tunnel: Support setting MTU on tunnels

[people/ms/network.git] / src / hooks / zones / ip-tunnel

#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2010  Michael Tremer & Christian Schmidt                      #
#                                                                             #
# This program is free software: you can redistribute it and/or modify        #
# it under the terms of the GNU General Public License as published by        #
# the Free Software Foundation, either version 3 of the License, or           #
# (at your option) any later version.                                         #
#                                                                             #
# This program is distributed in the hope that it will be useful,             #
# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
# GNU General Public License for more details.                                #
#                                                                             #
# You should have received a copy of the GNU General Public License           #
# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
#                                                                             #
###############################################################################

. /usr/lib/network/header-zone

SUPPORTED_IP_TUNNEL_MODES="gre sit vti"

HOOK_SETTINGS=(
	"MARK"
	"MODE"
	"MTU"
	"PEER"
	"LOCAL_ADDRESS"
)

# Default mode of the tunnel
DEFAULT_MODE="gre"

# Default MTU
DEFAULT_MTU="1480"

hook_check_settings() {
	assert isset MODE && assert isoneof MODE ${SUPPORTED_IP_TUNNEL_MODES}

	assert isset PEER && assert ip_is_valid "${PEER}"

	# LOCAL_ADDRESS must be valid and match the protocol of PEER
	if isset LOCAL_ADDRESS; then
		assert ip_is_valid "${LOCAL_ADDRESS}"
		assert ip_protocol_match "${PEER}" "${LOCAL_ADDRESS}"
	fi

	# Generate a random mark
	if ! isset MARK; then
		MARK="$(( ${RANDOM} & 0xffffffff ))"
	fi
}

hook_parse_cmdline() {
	while [ $# -gt 0 ]; do
		case "${1}" in
			--local-address=*)
				LOCAL_ADDRESS="$(cli_get_val "${1}")"
				;;

			--mode=*)
				MODE="$(cli_get_val "${1}")"

				# MODE must be on the list of supported protocols
				if ! isoneof MODE ${SUPPORTED_IP_TUNNEL_MODES}; then
					error "Unsupported mode: ${mode}"
					return ${EXIT_ERROR}
				fi
				;;

			--mtu=*)
				MTU="$(cli_get_val "${1}")"

				# Validate MTU
				if ! mtu_is_valid "ipv6" "${MTU}"; then
					error "Invalid MTU: ${MTU}"
					return ${EXIT_ERROR}
				fi
				;;

			--peer=*)
				PEER="$(cli_get_val "${1}")"
				;;

			*)
				error "Unknown option: ${1}"
				exit ${EXIT_ERROR}
				;;
		esac
		shift
	done

	# If PEER is set, it must be a valid IP address
	if isset PEER && ! ip_is_valid "${PEER}"; then
		error "Peer ${PEER} is not a valid IP address"
		return ${EXIT_ERROR}
	fi

	# If LOCAL_ADDRESS is set, it must be a valid IP address
	# of the same protocol than PEER is
	if isset LOCAL_ADDRESS; then
		if ! ip_is_valid "${LOCAL_ADDRESS}"; then
			error "Local address ${LOCAL_ADDRESS} is not a valid IP address"
			return ${EXIT_ERROR}
		fi

		if ! ip_protocol_match "${PEER}" "${LOCAL_ADDRESS}"; then
			error "Peer and local address are of different IP protocols"
			return ${EXIT_ERROR}
		fi
	fi

	return ${EXIT_OK}
}

hook_up() {
	local zone=${1}
	assert isset zone

	# Read configuration
	if ! zone_settings_read "${zone}"; then
		log ERROR "Could not read settings from ${zone}"
		exit ${EXIT_ERROR}
	fi

	# Create device if it doesn't exist, yet
	if ! device_exists "${zone}"; then
		ip_tunnel_add "${zone}" \
			--mode="${MODE}" \
			--mtu="${MTU}" \
			--remote-address="${PEER}" \
			--local-address="${LOCAL_ADDRESS}" \
			--ikey="${MARK}" \
			--okey="${MARK}"
	fi

	# Bring up the device
	device_set_up "${zone}"

	# Bring up all configurations
	zone_configs_up "${zone}"

	exit ${EXIT_OK}
}

hook_down() {
	local zone="${1}"
	assert isset zone

	# Stop all the configs.
	zone_configs_down "${zone}"

	# Remove the tunnel device
	ip_tunnel_del "${zone}" || exit $?

	exit ${EXIT_OK}
}

hook_status() {
	local zone=${1}
	assert isset zone

	cli_device_headline "${zone}"

	# Read configuration
	if ! zone_settings_read "${zone}"; then
		error "Could not read settings from ${zone}"
		exit ${EXIT_ERROR}
	fi

	cli_print_fmt1 1 "Mode" "$(ip_tunnel_protocol_to_name "${MODE}")"

	if isset PEER || isset LOCAL_ADDRESS; then
		if isset PEER; then
			cli_print_fmt1 1 "Peer" "${PEER}"
		fi

		if isset LOCAL_ADDRESS; then
			cli_print_fmt1 1 "Local Address" "${LOCAL_ADDRESS}"
		fi
	fi
	cli_space

	cli_headline 2 "Configurations"
	zone_configs_cmd status "${zone}"
	cli_space

	exit ${EXIT_OK}
}