roles/maas-simulate-fabric/tasks/main.yml

---
- name: Install prerequisites
  apt:
    name={{ item }}
    update_cache=yes
    cache_valid_time=3600
  become: yes
  register: result
  until: result | success
  retries: 15
  delay: 60
  with_items:
   - bridge-utils

- name: Create bridges
  when: "ansible_{{ item.name }} is not defined"
  command: brctl addbr "{{ item.name }}"
  with_items: "{{ simfabric_bridges }}"

# note, not idempotent if failed between prior step and this step
- name: Set IP addresses to bridges
  when: "ansible_{{ item.0.name }} is not defined"
  command: "ip addr add {{ item.1 }} dev {{ item.0.name }}"
  with_subelements:
   - "{{ simfabric_bridges }}"
   - addresses

- name: Run setup again to obtain bridge info
  setup:

- name: Start bridges
  when: "not ansible_{{ item.name }}.active"
  command: "ip link set dev {{ item.name }} up"
  with_items: "{{ simfabric_bridges }}"

- name: Create ip links
  when: "ansible_{{ item.dev }} is not defined"
  command: "ip link add dev {{ item.dev }} address {{ item.mac }} type {{ item.type }} peer name {{ item.peer }}"
  with_items: "{{ simfabric_links }}"

- name: Run setup again to obtain link info
  setup:

- name: Start interfaces
  when: "not ansible_{{ item }}.active"
  command: "ip link set dev {{ item }} up"
  with_items:
  - "{{ simfabric_links | map(attribute='dev') | list }}"
  - "{{ simfabric_links | map(attribute='peer') | list }}"

- name: Add interfaces to bridges
  when: "not item.1 in ansible_{{ item.0.name }}.interfaces"
  command: "brctl addif {{ item.0.name }} {{ item.1 }}"
  with_subelements:
   - "{{ simfabric_bridges }}"
   - interfaces

- name: Check for iptables rule
  command: "iptables -t nat -C POSTROUTING -s 10.168.0.0/16 ! -d 10.168.0.0/16 -j MASQUERADE"
  register: iptables_check
  failed_when: "iptables_check|failed and 'No chain/target/match by that name' not in iptables_check.stderr"
  tags:
    - skip_ansible_lint # FIXME: should use iptables module when it supports inversion of ranges

- name: Create iptables rule
  when: "iptables_check.rc != 0"
  command: "iptables -t nat -A POSTROUTING -s 10.168.0.0/16 ! -d 10.168.0.0/16 -j MASQUERADE"

# the below will likely work when this pull makes it into ansible:
# https://github.com/ansible/ansible-modules-extras/pull/1685
#   - name: Configure iptables
#     iptables: "table={{ item.table }} chain={{ item.chain }} source={{ item.source }} destination={{ item.dest }} jump={{ item.jump }}"
#     with_items: "{{ simfabric_iptables }}"

- name: Set kernel sysctl values
  sysctl:
    name="{{ item.name }}"
    value="{{ item.value }}"
    sysctl_set=yes
    state=present
    reload=yes
  with_items: "{{ simfabric_sysctl }}"