IPsec: Add (experimental) script that creates GRE/VTI interfaces

Signed-off-by: root <root@interim-edge-a.ec2.internal>

config/rootfiles/common/aarch64/stage2

@@ -93,6 +93,7 @@ usr/local/bin/connscheduler
 usr/local/bin/consort.sh
 usr/local/bin/convert-ovpn
 usr/local/bin/hddshutdown
+usr/local/bin/ipsec-interfaces
 usr/local/bin/makegraphs
 usr/local/bin/qosd
 usr/local/bin/readhash

config/rootfiles/common/stage2

@@ -91,6 +91,7 @@ usr/local/bin/connscheduler
 usr/local/bin/consort.sh
 usr/local/bin/convert-ovpn
 usr/local/bin/hddshutdown
+usr/local/bin/ipsec-interfaces
 usr/local/bin/makegraphs
 usr/local/bin/qosd
 usr/local/bin/readhash

config/rootfiles/common/x86_64/stage2

@@ -93,6 +93,7 @@ usr/local/bin/connscheduler
 usr/local/bin/consort.sh
 usr/local/bin/convert-ovpn
 usr/local/bin/hddshutdown
+usr/local/bin/ipsec-interfaces
 usr/local/bin/makegraphs
 usr/local/bin/qosd
 usr/local/bin/readhash

src/scripts/ipsec-interfaces

@@ -0,0 +1,132 @@
+#!/bin/bash
+###############################################################################
+#                                                                             #
+# IPFire.org - A linux based firewall                                         #
+# Copyright (C) 2015 IPFire Team                                              #
+#                                                                             #
+# 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/>.       #
+#                                                                             #
+###############################################################################
+
+shopt -s nullglob
+
+VPN_CONFIG="/var/ipfire/vpn/config"
+
+eval $(/usr/local/bin/readhash /var/ipfire/vpn/settings)
+
+VARS=(
+	id status name lefthost type ctype x1 x2 x3 leftsubnets
+	remote righthost rightsubnets x5 x6 x7 x8 x9 x10 x11 x12
+	x13 x14 x15 x16 x17 x18 x19 x20 x21 proto x22 x23 x24
+	route x26 mode interface_mode interface_address interface_mtu rest
+)
+
+log() {
+	logger -t ipsec "$@"
+}
+
+main() {
+	# We are done when IPsec is not enabled
+	[ "${ENABLED}" = "on" ] || exit 0
+
+	# Register local variables
+	local "${VARS[@]}"
+	local action
+
+	local interfaces=()
+
+	while IFS="," read -r "${VARS[@]}"; do
+		# Check if the connection is enabled
+		[ "${status}" = "on" ] || continue
+
+		# Check if this a net-to-net connection
+		[ "${type}" = "net" ] || continue
+
+		# Determine the interface name
+		case "${interface_mode}" in
+			gre|vti)
+				local intf="${interface_mode}${id}"
+				;;
+			*)
+				continue
+				;;
+		esac
+
+		# Add the interface to the list of all interfaces
+		interfaces+=( "${intf}" )
+
+		local args=(
+			"local" "${VPN_IP}"
+			"remote" "${remote}"
+			"ttl" "255"
+		)
+
+		# Add key for VTI
+		if [ "${interface_mode}" = "vti" ]; then
+			args+=( key "${id}" )
+		fi
+
+		# Update the settings when the interface already exists
+		if [ -d "/sys/class/net/${intf}" ]; then
+			ip link change dev "${intf}" \
+				type "${interface_mode}" "${args[@]}" &>/dev/null
+
+		# Create a new interface and bring it up
+		else
+			log "Creating interface ${intf}"
+			ip link add name "${intf}" type "${interface_mode}" "${args[@]}"
+		fi
+
+		# Add an IP address
+		ip addr flush dev "${intf}"
+		ip addr add "${interface_address}" dev "${intf}"
+
+		# Set MTU
+		ip link set dev "${intf}" mtu "${interface_mtu}"
+
+		# Bring up the interface
+		ip link set dev "${intf}" up
+	done < "${VPN_CONFIG}"
+
+	# Delete all other interfaces
+	local intf
+	for intf in /sys/class/net/gre* /sys/class/net/vti*; do
+		intf="$(basename "${intf}")"
+
+		# Ignore a couple of interfaces that cannot be deleted
+		case "${intf}" in
+			gre0|gretap0)
+				continue
+				;;
+		esac
+
+		# Check if interface is on the list
+		local i found="false"
+		for i in ${interfaces[@]}; do
+			if [ "${intf}" = "${i}" ]; then
+				found="true"
+				break
+			fi
+		done
+
+		# Nothing to do if interface was found
+		${found} && continue
+
+		# Delete the interface
+		log "Deleting interface ${intf}"
+		ip link del "${intf}" &>/dev/null
+	done
+}
+
+main || exit $?