ADD import roles

roles/radvd/defaults/main.yml

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+radvd_enabled: false

roles/radvd/handlers/main.yml

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+---
+- name: Restart radvd
+  ansible.builtin.systemd_service:
+    name: radvd.service
+    state: restarted
+    enabled: true

roles/radvd/tasks/main.yml

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+---
+- name: Set OS dependent variables
+  include_vars: "{{ lookup('first_found', params) }}"
+  vars:
+    params:
+      files:
+        - "{{ ansible_distribution | lower }}_{{ ansible_distribution_version | lower }}.yml"
+        - "{{ ansible_distribution | lower }}_{{ ansible_distribution_major_version | lower }}.yml"
+        - "{{ ansible_distribution | lower }}.yml"
+        - "{{ ansible_os_family | lower }}.yml"
+        - "{{ ansible_system | lower }}.yml"
+      paths:
+        - "{{ role_path }}/vars"
+  ignore_errors: True
+  tags:
+    - always
+
+- name: OS is supported
+  assert:
+    that: __os_supported
+    quiet: True
+  vars:
+    __os_supported: "{{ lookup('vars', '{}_os_supported'.format(role_name)) | bool }}"
+  tags:
+    - always
+
+- name: Install required packages
+  package:
+    name: "{{ item }}"
+    state: present
+  with_items: "{{ lookup('vars', '{}_packages'.format(role_name)) | list }}"
+  when: radvd_enabled
+  tags:
+    - install
+
+- name: Install radvd configuration
+  template:
+    src: radvd.conf.j2
+    dest: "/etc/radvd.conf"
+    owner: root
+    group: root
+    mode: 0644
+  tags:
+    - configure
+  no_log: false
+  notify: Restart radvd
+
+- name: Enable radvd service
+  ansible.builtin.systemd_service:
+    name: radvd.service
+    state: started
+    enabled: true

roles/radvd/templates/radvd.conf.j2

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+# {{ ansible_managed }}
+{% for iface in radvd_interfaces | default([]) %}
+interface {{ iface.name }} {
+    AdvSendAdvert on;
+    MinRtrAdvInterval 5;
+    MaxRtrAdvInterval 15;
+    route ::/0 {};
+    AdvManagedFlag off;
+    AdvOtherConfigFlag off;
+    prefix {{ iface.prefix }} {
+        AdvOnLink on;
+        AdvAutonomous on;
+        AdvRouterAddr on;
+    };
+{% if iface.source is defined %}
+    AdvRASrcAddress {
+        {{ iface.source }};
+    };
+{% endif %}
+    RDNSS {{ iface.dns | default(['2a00:1398::1', '2a00:1398::2']) | join(' ') }} {
+        AdvRDNSSLifetime {{ iface.dns_lifetime | default(3600) }};
+    };
+};
+{% endfor %}

roles/radvd/vars/debian.yml

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+radvd_os_supported: true
+radvd_packages:
+  - radvd

roles/radvd/vars/main.yml

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+bird_os_supported: false