network: Add BGP+EVPN+VXLAN script to main repository and Agent package

scripts/vm/network/vnet/modifyvxlan-evpn.sh

@@ -0,0 +1,163 @@
+#!/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.
+
+#
+# Use BGP+EVPN for VXLAN with CloudStack instead of Multicast
+#
+# The default 'modifyvxlan.sh' script from CloudStack uses Multicast instead of EVPN for VXLAN
+# In order to use this script and thus utilize BGP+EVPN, symlink this file:
+#
+# cd /usr/share
+# ln -s cloudstack-common/scripts/vm/network/vnet/modifyvxlan-evpn.sh modifyvxlan.sh
+#
+#
+# CloudStack will not handle the BGP configuration nor communication, the operator of the hypervisor will
+# need to configure the properly.
+#
+# Frrouting is recommend to be used on the hypervisor to establish BGP sessions with upstream routers and
+# exchange BGP+EVPN information.
+#
+# More information about BGP and EVPN with FRR: https://vincent.bernat.ch/en/blog/2017-vxlan-bgp-evpn
+#
+
+DSTPORT=4789
+
+# We bind our VXLAN tunnel IP(v4) on Loopback device 'lo'
+DEV="lo"
+
+usage() {
+    echo "Usage: $0: -o <op>(add | delete) -v <vxlan id> -p <pif> -b <bridge name> (-6)"
+}
+
+localAddr() {
+    local FAMILY=$1
+
+    if [[ -z "$FAMILY" || $FAMILY == "inet" ]]; then
+       ip -4 -o addr show scope global dev ${DEV} | awk 'NR==1 {gsub("/[0-9]+", "") ; print $4}'
+    fi
+
+    if [[ "$FAMILY" == "inet6" ]]; then
+       ip -6 -o addr show scope global dev ${DEV} | awk 'NR==1 {gsub("/[0-9]+", "") ; print $4}'
+    fi
+}
+
+addVxlan() {
+    local VNI=$1
+    local PIF=$2
+    local VXLAN_BR=$3
+    local FAMILY=$4
+    local VXLAN_DEV=vxlan${VNI}
+    local ADDR=$(localAddr ${FAMILY})
+
+    echo "local addr for VNI ${VNI} is ${ADDR}"
+
+    if [[ ! -d /sys/class/net/${VXLAN_DEV} ]]; then
+        ip -f ${FAMILY} link add ${VXLAN_DEV} type vxlan id ${VNI} local ${ADDR} dstport ${DSTPORT} nolearning
+        ip link set ${VXLAN_DEV} up
+        sysctl -qw net.ipv6.conf.${VXLAN_DEV}.disable_ipv6=1
+    fi
+
+    if [[ ! -d /sys/class/net/$VXLAN_BR ]]; then
+        ip link add name ${VXLAN_BR} type bridge
+        ip link set ${VXLAN_BR} up
+        sysctl -qw net.ipv6.conf.${VXLAN_BR}.disable_ipv6=1
+    fi
+
+    bridge link show|grep ${VXLAN_BR}|awk '{print $2}'|grep "^${VXLAN_DEV}\$" > /dev/null
+    if [[ $? -gt 0 ]]; then
+        ip link set ${VXLAN_DEV} master ${VXLAN_BR}
+    fi
+}
+
+deleteVxlan() {
+    local VNI=$1
+    local PIF=$2
+    local VXLAN_BR=$3
+    local FAMILY=$4
+    local VXLAN_DEV=vxlan${VNI}
+
+    ip link set ${VXLAN_DEV} nomaster
+    ip link delete ${VXLAN_DEV}
+
+    ip link set ${VXLAN_BR} down
+    ip link delete ${VXLAN_BR} type bridge
+}
+
+OP=
+VNI=
+FAMILY=inet
+option=$@
+
+while getopts 'o:v:p:b:6' OPTION
+do
+  case $OPTION in
+  o)    oflag=1
+        OP="$OPTARG"
+        ;;
+  v)    vflag=1
+        VNI="$OPTARG"
+        ;;
+  p)    pflag=1
+        PIF="$OPTARG"
+        ;;
+  b)    bflag=1
+        BRNAME="$OPTARG"
+        ;;
+  6)
+        FAMILY=inet6
+        ;;
+  ?)    usage
+        exit 2
+        ;;
+  esac
+done
+
+if [[ "$oflag$vflag$pflag$bflag" != "1111" ]]; then
+    usage
+    exit 2
+fi
+
+lsmod|grep ^vxlan >& /dev/null
+if [[ $? -gt 0 ]]; then
+    modprobe=`modprobe vxlan 2>&1`
+    if [[ $? -gt 0 ]]; then
+        echo "Failed to load vxlan kernel module: $modprobe"
+        exit 1
+    fi
+fi
+
+
+#
+# Add a lockfile to prevent this script from running twice on the same host
+# this can cause a race condition
+#
+
+LOCKFILE=/var/run/cloud/vxlan.lock
+
+(
+    flock -x -w 10 200 || exit 1
+    if [[ "$OP" == "add" ]]; then
+        addVxlan ${VNI} ${PIF} ${BRNAME} ${FAMILY}
+
+        if [[ $? -gt 0 ]]; then
+            exit 1
+        fi
+    elif [[ "$OP" == "delete" ]]; then
+        deleteVxlan ${VNI} ${PIF} ${BRNAME} ${FAMILY}
+    fi
+) 200>${LOCKFILE}