#cloud-config

# Copyright 2020 Google LLC
#
# 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.

write_files:
  - path: /etc/sysctl.conf
    permissions: "0644"
    owner: root
    content: |
      net.ipv4.ip_forward = 1
      net.ipv6.conf.all.forwarding = 1
      net.ipv4.conf.all.accept_redirects = 0
      net.ipv4.conf.all.send_redirects = 0
      # https://tldp.org/HOWTO/Adv-Routing-HOWTO/lartc.kernel.rpf.html
      net.ipv4.conf.all.rp_filter = 2
      net.ipv4.conf.ens4.rp_filter = 2
      net.ipv4.conf.ens5.rp_filter = 2
  - path: /etc/netplan/99-nic2-routing.yaml
    permissions: "0644"
    owner: root
    content: |
      network:
        ethernets:
          ens5:
            dhcp4: true
            routes:
            - to: 0.0.0.0/0
              via: ${gw_right}
              table: 102
            routing-policy:
              - from: ${ip_cidr_right}
                to: 35.191.0.0/16
                table: 102
              - from: ${ip_cidr_right}
                to: 130.211.0.0/22
                table: 102
        version: 2
  - path: /root/start.sh
    permissions: "0755"
    owner: root
    content: |
      #!/bin/bash
      iptables -D INPUT -s 35.191.0.0/16 -j REJECT
      iptables -D INPUT -s 130.211.0.0/22 -j REJECT
  - path: /root/stop.sh
    permissions: "0755"
    owner: root
    content: |
      #!/bin/bash
      iptables -I INPUT -s 35.191.0.0/16 -j REJECT
      iptables -I INPUT -s 130.211.0.0/22 -j REJECT
package_update: true
package_upgrade: true
package_reboot_if_required: true
packages:
  - iftop
  - tcpdump
runcmd:
  - sysctl -p
  - netplan apply