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#!/bin/bash
# Copyright (C) 2014 Nicira, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Check for programs we'll need.
search_path () {
save_IFS=$IFS
IFS=:
for dir in $PATH; do
IFS=$save_IFS
if test -x "$dir/$1"; then
return 0
fi
done
IFS=$save_IFS
echo >&2 "$0: $1 not found in \$PATH, please install and try again"
exit 1
}
ovs_vsctl () {
ovs-vsctl --timeout=60 "$@"
}
create_netns_link () {
mkdir -p /var/run/netns
if [ ! -e /var/run/netns/"$PID" ]; then
ln -s /proc/"$PID"/ns/net /var/run/netns/"$PID"
trap 'delete_netns_link' 0
for signal in 1 2 3 13 14 15; do
trap 'delete_netns_link; trap - $signal; kill -$signal $$' $signal
done
fi
}
delete_netns_link () {
rm -f /var/run/netns/"$PID"
}
get_port_for_container_interface () {
CONTAINER="$1"
INTERFACE="$2"
PORT=`ovs_vsctl --data=bare --no-heading --columns=name find interface \
external_ids:container_id="$CONTAINER" \
external_ids:container_iface="$INTERFACE"`
if [ -z "$PORT" ]; then
echo >&2 "$UTIL: Failed to find any attached port" \
"for CONTAINER=$CONTAINER and INTERFACE=$INTERFACE"
fi
echo "$PORT"
}
add_port () {
BRIDGE="$1"
INTERFACE="$2"
CONTAINER="$3"
if [ -z "$BRIDGE" ] || [ -z "$INTERFACE" ] || [ -z "$CONTAINER" ]; then
echo >&2 "$UTIL add-port: not enough arguments (use --help for help)"
exit 1
fi
shift 3
while [ $# -ne 0 ]; do
case $1 in
--ipaddress=*)
ADDRESS=`expr X"$1" : 'X[^=]*=\(.*\)'`
shift
;;
--macaddress=*)
MACADDRESS=`expr X"$1" : 'X[^=]*=\(.*\)'`
shift
;;
--gateway=*)
GATEWAY=`expr X"$1" : 'X[^=]*=\(.*\)'`
shift
;;
--mtu=*)
MTU=`expr X"$1" : 'X[^=]*=\(.*\)'`
shift
;;
*)
echo >&2 "$UTIL add-port: unknown option \"$1\""
exit 1
;;
esac
done
# Check if a port is already attached for the given container and interface
PORT=`get_port_for_container_interface "$CONTAINER" "$INTERFACE" \
2>/dev/null`
if [ -n "$PORT" ]; then
echo >&2 "$UTIL: Port already attached" \
"for CONTAINER=$CONTAINER and INTERFACE=$INTERFACE"
exit 1
fi
if ovs_vsctl br-exists "$BRIDGE" || \
ovs_vsctl add-br "$BRIDGE"; then :; else
echo >&2 "$UTIL: Failed to create bridge $BRIDGE"
exit 1
fi
if PID=`docker inspect -f '{{.State.Pid}}' "$CONTAINER"`; then :; else
echo >&2 "$UTIL: Failed to get the PID of the container"
exit 1
fi
create_netns_link
# Create a veth pair.
ID=`uuidgen | sed 's/-//g'`
PORTNAME="${ID:0:13}"
ip link add "${PORTNAME}_l" type veth peer name "${PORTNAME}_c"
# Add one end of veth to OVS bridge.
if ovs_vsctl --may-exist add-port "$BRIDGE" "${PORTNAME}_l" \
-- set interface "${PORTNAME}_l" \
external_ids:container_id="$CONTAINER" \
external_ids:container_iface="$INTERFACE"; then :; else
echo >&2 "$UTIL: Failed to add "${PORTNAME}_l" port to bridge $BRIDGE"
ip link delete "${PORTNAME}_l"
exit 1
fi
ip link set "${PORTNAME}_l" up
# Move "${PORTNAME}_c" inside the container and changes its name.
ip link set "${PORTNAME}_c" netns "$PID"
ip netns exec "$PID" ip link set dev "${PORTNAME}_c" name "$INTERFACE"
ip netns exec "$PID" ip link set "$INTERFACE" up
if [ -n "$MTU" ]; then
ip netns exec "$PID" ip link set dev "$INTERFACE" mtu "$MTU"
fi
if [ -n "$ADDRESS" ]; then
ip netns exec "$PID" ip addr add "$ADDRESS" dev "$INTERFACE"
fi
if [ -n "$MACADDRESS" ]; then
ip netns exec "$PID" ip link set dev "$INTERFACE" address "$MACADDRESS"
fi
if [ -n "$GATEWAY" ]; then
ip netns exec "$PID" ip route add default via "$GATEWAY"
fi
}
del_port () {
BRIDGE="$1"
INTERFACE="$2"
CONTAINER="$3"
if [ "$#" -lt 3 ]; then
usage
exit 1
fi
PORT=`get_port_for_container_interface "$CONTAINER" "$INTERFACE"`
if [ -z "$PORT" ]; then
exit 1
fi
ovs_vsctl --if-exists del-port "$PORT"
ip link delete "$PORT"
}
del_ports () {
BRIDGE="$1"
CONTAINER="$2"
if [ "$#" -lt 2 ]; then
usage
exit 1
fi
PORTS=`ovs_vsctl --data=bare --no-heading --columns=name find interface \
external_ids:container_id="$CONTAINER"`
if [ -z "$PORTS" ]; then
exit 0
fi
for PORT in $PORTS; do
ovs_vsctl --if-exists del-port "$PORT"
ip link delete "$PORT"
done
}
set_vlan () {
BRIDGE="$1"
INTERFACE="$2"
CONTAINER_ID="$3"
VLAN="$4"
if [ "$#" -lt 4 ]; then
usage
exit 1
fi
PORT=`get_port_for_container_interface "$CONTAINER_ID" "$INTERFACE"`
if [ -z "$PORT" ]; then
exit 1
fi
ovs_vsctl set port "$PORT" tag="$VLAN"
}
usage() {
cat << EOF
${UTIL}: Performs integration of Open vSwitch with Docker.
usage: ${UTIL} COMMAND
Commands:
add-port BRIDGE INTERFACE CONTAINER [--ipaddress="ADDRESS"]
[--gateway=GATEWAY] [--macaddress="MACADDRESS"]
[--mtu=MTU]
Adds INTERFACE inside CONTAINER and connects it as a port
in Open vSwitch BRIDGE. Optionally, sets ADDRESS on
INTERFACE. ADDRESS can include a '/' to represent network
prefix length. Optionally, sets a GATEWAY, MACADDRESS
and MTU. e.g.:
${UTIL} add-port br-int eth1 c474a0e2830e
--ipaddress=192.168.1.2/24 --gateway=192.168.1.1
--macaddress="a2:c3:0d:49:7f:f8" --mtu=1450
del-port BRIDGE INTERFACE CONTAINER
Deletes INTERFACE inside CONTAINER and removes its
connection to Open vSwitch BRIDGE. e.g.:
${UTIL} del-port br-int eth1 c474a0e2830e
del-ports BRIDGE CONTAINER
Removes all Open vSwitch interfaces from CONTAINER. e.g.:
${UTIL} del-ports br-int c474a0e2830e
set-vlan BRIDGE INTERFACE CONTAINER VLAN
Configures the INTERFACE of CONTAINER attached to BRIDGE
to become an access port of VLAN. e.g.:
${UTIL} set-vlan br-int eth1 c474a0e2830e 5
Options:
-h, --help display this help message.
EOF
}
UTIL=$(basename $0)
search_path ovs-vsctl
search_path docker
search_path uuidgen
if (ip netns) > /dev/null 2>&1; then :; else
echo >&2 "$UTIL: ip utility not found (or it does not support netns),"\
"cannot proceed"
exit 1
fi
if [ $# -eq 0 ]; then
usage
exit 0
fi
case $1 in
"add-port")
shift
add_port "$@"
exit 0
;;
"del-port")
shift
del_port "$@"
exit 0
;;
"del-ports")
shift
del_ports "$@"
exit 0
;;
"set-vlan")
shift
set_vlan "$@"
exit 0
;;
-h | --help)
usage
exit 0
;;
*)
echo >&2 "$UTIL: unknown command \"$1\" (use --help for help)"
exit 1
;;
esac