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executable file
·239 lines (205 loc) · 4.99 KB
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#!/usr/bin/env bash
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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.
# modifyvxlan.sh -- adds and deletes VXLANs from a Routing Server
# set -x
## TODO(VXLAN): MTU, IPv6 underlying
usage() {
printf "Usage: %s: -o <op>(add | delete) -v <vxlan id> -p <pif> -b <bridge name>\n"
}
addVxlan() {
local vxlanId=$1
local pif=$2
local vxlanDev=vxlan$vxlanId
local vxlanBr=$3
local mcastGrp="239.$(( ($vxlanId >> 16) % 256 )).$(( ($vxlanId >> 8) % 256 )).$(( $vxlanId % 256 ))"
## TODO(VXLAN): $brif (trafficlabel) should be passed from caller because we cannot assume 1:1 mapping between pif and brif.
# lookup bridge interface
local sysfs_dir=/sys/devices/virtual/net/
local brif=`find ${sysfs_dir}*/brif/ -name $pif | sed -e "s,$sysfs_dir,," | sed -e 's,/brif/.*$,,'`
if [ "$brif " == " " ]
then
if [ -d "/sys/class/net/${pif}" ]
then
# if bridge is not found, but matches a pif, use it
brif=$pif
else
printf "Failed to lookup bridge interface which includes pif: $pif."
return 1
fi
else
# confirm ip address of $brif
ip addr show $brif | grep -w inet
if [ $? -gt 0 ]
then
printf "Failed to find vxlan multicast source ip address on brif: $brif."
return 1
fi
fi
# mcast route
## TODO(VXLAN): Can we assume there're only one IP address which can be multicast src IP on the IF?
ip route get $mcastGrp | grep -w "dev $brif"
if [ $? -gt 0 ]
then
ip route add $mcastGrp/32 dev $brif
if [ $? -gt 0 ]
then
printf "Failed to add vxlan multicast route on brif: $brif."
return 1
fi
fi
if [ ! -d /sys/class/net/$vxlanDev ]
then
ip link add $vxlanDev type vxlan id $vxlanId group $mcastGrp ttl 10 dev $brif
if [ $? -gt 0 ]
then
# race condition that someone already creates the vxlan
if [ ! -d /sys/class/net/$vxlanDev ]
then
printf "Failed to create vxlan $vxlanId on brif: $brif."
return 1
fi
fi
fi
# is up?
ip link show $vxlanDev | grep -w UP > /dev/null
if [ $? -gt 0 ]
then
ip link set $vxlanDev up > /dev/null
fi
if [ ! -d /sys/class/net/$vxlanBr ]
then
brctl addbr $vxlanBr > /dev/null
if [ $? -gt 0 ]
then
if [ ! -d /sys/class/net/$vxlanBr ]
then
printf "Failed to create br: $vxlanBr"
return 2
fi
fi
brctl setfd $vxlanBr 0
fi
#pif is eslaved into vxlanBr?
ls /sys/class/net/$vxlanBr/brif/ | grep -w "$vxlanDev" > /dev/null
if [ $? -gt 0 ]
then
brctl addif $vxlanBr $vxlanDev > /dev/null
if [ $? -gt 0 ]
then
ls /sys/class/net/$vxlanBr/brif/ | grep -w "$vxlanDev" > /dev/null
if [ $? -gt 0 ]
then
printf "Failed to add vxlan: $vxlanDev to $vxlanBr"
return 3
fi
fi
fi
# is vxlanBr up?
ip link show $vxlanBr | grep -w UP > /dev/null
if [ $? -gt 0 ]
then
ip link set $vxlanBr up
fi
return 0
}
deleteVxlan() {
local vxlanId=$1
local pif=$2
local vxlanDev=vxlan$vxlanId
local vxlanBr=$3
local mcastGrp="239.$(( ($vxlanId >> 16) % 256 )).$(( ($vxlanId >> 8) % 256 )).$(( $vxlanId % 256 ))"
local sysfs_dir=/sys/devices/virtual/net/
local brif=`find ${sysfs_dir}*/brif/ -name $pif | sed -e "s,$sysfs_dir,," | sed -e 's,/brif/.*$,,'`
ip route del $mcastGrp/32 dev $brif
ip link delete $vxlanDev
if [ $? -gt 0 ]
then
printf "Failed to del vxlan: $vxlanId"
printf "Continue..."
fi
ip link set $vxlanBr down
if [ $? -gt 0 ]
then
return 1
fi
brctl delbr $vxlanBr
if [ $? -gt 0 ]
then
printf "Failed to del bridge $vxlanBr"
return 1
fi
return 0
}
op=
vxlanId=
option=$@
while getopts 'o:v:p:b:' OPTION
do
case $OPTION in
o) oflag=1
op="$OPTARG"
;;
v) vflag=1
vxlanId="$OPTARG"
;;
p) pflag=1
pif="$OPTARG"
;;
b) bflag=1
brName="$OPTARG"
;;
?) usage
exit 2
;;
esac
done
# Check that all arguments were passed in
if [ "$oflag$vflag$pflag$bflag" != "1111" ]
then
usage
exit 2
fi
# Do we support Vxlan?
lsmod|grep ^vxlan >& /dev/null
if [ $? -gt 0 ]
then
modprobe=`modprobe vxlan 2>&1`
if [ $? -gt 0 ]
then
printf "Failed to load vxlan kernel module: $modprobe"
exit 1
fi
fi
if [ "$op" == "add" ]
then
# Add the vxlan
addVxlan $vxlanId $pif $brName
# If the add fails then return failure
if [ $? -gt 0 ]
then
exit 1
fi
else
if [ "$op" == "delete" ]
then
# Delete the vxlan
deleteVxlan $vxlanId $pif $brName
# Always exit with success
exit 0
fi
fi