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#! /bin/sh
# Copyright (c) 2011, 2013, 2016 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.
case $0 in
*/*) dir0=`echo "$0" | sed 's,/[^/]*$,,'` ;;
*) dir0=./ ;;
esac
. "$dir0/ovs-lib" || exit 1
usage() {
UTIL=$(basename $0)
cat <<EOF
${UTIL}: Provides helper functions to save Open vSwitch's configuration.
usage: $0 COMMAND
Commands:
save-interfaces Outputs a shell script on stdout that will restore
the current kernel configuration of the specified
network interfaces, as well as the system iptables
configuration.
save-flows Outputs a shell script on stdout that will restore
OpenFlow flows of each Open vSwitch bridge.
This script is meant as a helper for the Open vSwitch init script commands.
EOF
}
save_interfaces () {
if (ip link show) > /dev/null 2>&1; then :; else
echo "$0: ip not found in $PATH" >&2
exit 1
fi
if test "$#" = 0; then
exit 0
fi
devs="$@"
for dev in $devs; do
state=`ip link show dev $dev` || continue
echo "# $dev"
# Link state (Ethernet addresses, up/down, ...)
linkcmd=
case $state in
*"state UP"* | *[,\<]"UP"[,\>]* )
linkcmd="$linkcmd up"
;;
*"state DOWN"*)
linkcmd="$linkcmd down"
;;
esac
if expr "$state" : '.*\bdynamic\b' > /dev/null; then
linkcmd="$linkcmd dynamic"
fi
if qlen=`expr "$state" : '.*qlen \([0-9]\+\)'`; then
linkcmd="$linkcmd txqueuelen $qlen"
fi
if hwaddr=`expr "$state" : '.*link/ether \([^ ]*\)'`; then
linkcmd="$linkcmd address $hwaddr"
fi
if brd=`expr "$state" : '.*brd \([^ ]*\)'`; then
linkcmd="$linkcmd broadcast $brd"
fi
if mtu=`expr "$state" : '.*mtu \([0-9]\+\)'`; then
linkcmd="$linkcmd mtu $mtu"
fi
if test -n "$linkcmd"; then
echo ip link set dev $dev down # Required to change hwaddr.
echo ip link set dev $dev $linkcmd
fi
move_ip_address $dev $dev
move_ip_routes $dev $dev
echo
done
if (iptables-save) > /dev/null 2>&1; then
echo "# global"
echo "iptables-restore <<'EOF'"
iptables-save
echo "EOF"
else
echo "# iptables-save not found in $PATH, not saving iptables state"
fi
}
get_highest_ofp_version() {
ovs-vsctl get bridge "$1" protocols | \
sed 's/[][]//g' | sed 's/\ //g' | \
awk -F ',' '{ print (NF>0)? $(NF) : "OpenFlow14" }'
}
save_flows () {
if (ovs-ofctl --version) > /dev/null 2>&1; then :; else
echo "$0: ovs-ofctl not found in $PATH" >&2
exit 1
fi
# OVS 2.7 and earlier do not enable OpenFlow 1.4 (by default) and lack
# other features needed to save and restore flows. Don't try.
case `ovs-appctl version | sed 1q` in
"ovs-vswitchd (Open vSwitch) 1."*.*)
return
;;
"ovs-vswitchd (Open vSwitch) 2."[0-7].*)
return
;;
esac
workdir=$(mktemp -d "${TMPDIR:-/tmp}/ovs-save.XXXXXXXXXX")
for bridge in "$@"; do
# Get the highest enabled OpenFlow version
ofp_version=$(get_highest_ofp_version "$bridge")
printf "%s" "ovs-ofctl -O $ofp_version add-tlv-map ${bridge} '"
ovs-ofctl dump-tlv-map ${bridge} -O $ofp_version | \
awk '/^ *0x/ {if (cnt != 0) printf ","; \
cnt++;printf "{class="$1",type="$2",len="$3"}->"$4}'
echo "'"
# If possible use OpenFlow 1.4 atomic bundle txn for flows and groups
[ ${ofp_version#OpenFlow} -ge 14 ] && bundle=" --bundle" || bundle=""
echo "ovs-ofctl -O $ofp_version add-groups ${bridge} \
\"$workdir/$bridge.groups.dump\" ${bundle}"
echo "ovs-ofctl -O $ofp_version replace-flows ${bridge} \
\"$workdir/$bridge.flows.dump\" ${bundle}"
ovs-ofctl -O $ofp_version dump-groups "$bridge" | \
sed -e '/^OFPST_GROUP_DESC/d' \
-e '/^NXST_GROUP_DESC/d' > \
"$workdir/$bridge.groups.dump"
ovs-ofctl -O $ofp_version dump-flows --no-names --no-stats "$bridge" | \
sed -e '/NXST_FLOW/d' \
-e '/OFPST_FLOW/d' \
-e 's/\(idle\|hard\)_age=[^,]*,//g' \
-e 's/igmp_type/tp_src/g' \
-e 's/igmp_code/tp_dst/g' \
-e 's/igmp/ip,nw_proto=2/g' > \
"$workdir/$bridge.flows.dump"
done
echo "rm -rf \"$workdir\""
}
while [ $# -ne 0 ]
do
case $1 in
"save-flows")
shift
save_flows "$@"
exit 0
;;
"save-interfaces")
shift
save_interfaces "$@"
exit 0
;;
-h | --help)
usage
exit 0
;;
*)
echo >&2 "$0: unknown command \"$1\" (use --help for help)"
exit 1
;;
esac
done
exit 0