58 lines
2.4 KiB
Bash
58 lines
2.4 KiB
Bash
#!/bin/bash
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# Copyright 2023 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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IF_NAME=$1
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IF_NUMBER=$(echo $IF_NAME | sed -e s/eth//)
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IF_GW=$(curl http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/$IF_NUMBER/gateway -H "Metadata-Flavor: Google")
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IF_IP=$(curl http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/$IF_NUMBER/ip -H "Metadata-Flavor: Google")
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IF_NETMASK=$(curl http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/$IF_NUMBER/subnetmask -H "Metadata-Flavor: Google")
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IF_IP_PREFIX=$(/var/run/nva/ipprefix_by_netmask.sh $IF_NETMASK)
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# Sleep while there's no load balancer IP route for this IF
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while true
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do
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IPS_LB_STR=$(ip r show table local | grep "$IF_NAME proto 66" | cut -f 2 -d " " | tr -s '\n' ' ')
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IPS_LB=($IPS_LB_STR)
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for IP in "${IPS_LB[@]}"
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do
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# Configure hc routing table if not available for this network interface
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grep -qxF "$((200 + $IF_NUMBER)) hc-$IF_NAME" /etc/iproute2/rt_tables || {
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echo "$((200 + $IF_NUMBER)) hc-$IF_NAME" >>/etc/iproute2/rt_tables
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ip route add $IF_GW src $IF_IP dev $IF_NAME table hc-$IF_NAME
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ip route add default via $IF_GW dev $IF_NAME table hc-$IF_NAME
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}
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# configure PBR route for LB
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ip rule list | grep -qF "$IP" || ip rule add from $IP/32 table hc-$IF_NAME
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done
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# remove previously configure PBR for old LB removed from network interface
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# first get list of PBR on this network interface and retrieve LB IP addresses
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PBR_LB_IPS_STR=$(ip rule list | grep "hc-$IF_NAME" | cut -f 2 -d " " | tr -s '\n' ' ')
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PBR_LB_IPS=($PBR_LB_IPS_STR)
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# iterate over PBR LB IP addresses
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for PBR_IP in "${PBR_LB_IPS[@]}"
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do
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# check if the PBR LB IP belongs to the current array of LB IPs attached to the
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# network interface, if not delete the corresponding PBR rule
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if [ -z "$IPS_LB" ] || ! echo ${IPS_LB[@]} | grep --quiet "$PBR_IP" ; then
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ip rule del from $PBR_IP
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fi
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done
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sleep 2
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done
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