---
# Not all variables have sensible defaults, let's ensure these are set.
- name: Ensure mandatory variables are defined
  assert:
    that:
      - vxlan_interface_name is defined
      - vxlan_vni is defined

# We have had cases where the nodepool private IP address is not assigned,
# which causes hard to diagnose errors later on. Catch it early.
- name: Assert that the nodepool private IPv4 address is assigned
  assert:
    that: nodepool.private_ipv4 in ansible_all_ipv4_addresses
    fail_msg: >-
      The nodepool private IP address {{ nodepool.private_ipv4 }} is not assigned

- name: Set VXLAN interface facts
  set_fact:
    tunnel_local_address: "{{ nodepool.private_ipv4 }}"

- name: Create VXLAN interface
  become: true
  command: ip link add {{ vxlan_interface_name }} type vxlan id {{ vxlan_vni }} local {{ tunnel_local_address }} dstport {{ vxlan_dstport }}

- name: Set VXLAN interface MTU
  become: true
  vars:
    # Find the parent interface
    parent_interface: >-
      {{ ansible_interfaces |
          map('extract', ansible_facts) |
          selectattr('ipv4.address', 'defined') |
          selectattr('ipv4.address', 'equalto', tunnel_local_address) |
          first }}
    # Allow 50 bytes overhead for VXLAN headers.
    mtu: "{{ parent_interface.mtu | int - 50 }}"
  command: ip link set {{ vxlan_interface_name }} mtu {{ mtu }}

# emulate BUM by multiplicating traffic to unicast targets
- name: Add fdb entries for BUM traffic
  become: true
  vars:
    dest_ip: "{{ hostvars[item].tunnel_local_address }}"
  command: bridge fdb append 00:00:00:00:00:00 dev {{ vxlan_interface_name }} dst {{ dest_ip }}
  with_inventory_hostnames: all
  when: item != inventory_hostname

- name: Bring VXLAN interface up
  become: true
  command: ip link set {{ vxlan_interface_name }} up