Add radvd role

roles/radvd/README.md

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+Install radvd and send out RAs on all interfaces where the configured IPv6 address is the gateway address for its prefix.

roles/radvd/handlers/main.yml

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+- name: reload radvd
+  service:
+    name: radvd
+    state: reloaded
+  when: "'handler' not in ansible_skip_tags"

roles/radvd/tasks/main.yml

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+- name: Install packages
+  package:
+    name:
+    - radvd
+
+- name: Configure radvd
+  template:
+    dest: /etc/radvd.conf
+    src: radvd.conf.j2
+  notify: reload radvd
+
+- name: Enable radvd service
+  service:
+    name: radvd
+    enabled: true
+    state: started

roles/radvd/templates/radvd.conf.j2

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+{% for iface in interfaces
+    | defaultattr('mgmt_only') | rejectattr('mgmt_only')
+    | selectattr('enabled') %}
+{% for address in iface.ip_addresses | selectattr("family.value", "==", 6) %}
+{# get the gateway for this subnet #}
+{% set subnet = address.address | ipaddr('subnet') %}
+{% set prefix = prefixes | selectattr('prefix', '==', subnet) | first %}
+{% set gateway = prefix.custom_fields.gateway.address %}
+{# if we are gateway, send RAs on this interface #}
+{% if gateway is defined and gateway == address.address %}
+interface {{ iface.name }} {
+	AdvSendAdvert on;
+	prefix ::/64;
+	RDNSS {{ dns6 | join(' ') }} { };
+	DNSSL {{ domain }} { };
+};
+
+{% endif %}
+{% endfor %}
+{% endfor %}