Initial role

nftables/defaults/nftables.yml

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+nftables:
+  # Rules to add
+  #  Handled as templates
+  #  Creates separate files for each entry.
+  # The identifier is necessary for ansible to be able to merge the keys (when 'hash_behaviour = merge')
+  #  rule-ids have to be unique across files and raw
+  rules:
+    # Files with Rules to add
+    files:
+      #'<group_identifier>': '<relative-location>'
+      #'<group_identifier>':
+      #  main: <relative-location>
+      #  '<identifier>': '<relative-location>'
+
+    # Rules to add
+    raw:
+      #'<group_identifier>': '<content>'
+      #'<group_identifier>':
+      #  main: <content>
+      #  '<identifier>': '<content>'
+
+  # Decides if /etc/nftables.conf is applied or separate files which have changed
+  #  Separate changes require the files to be self-tyding to not end up with duplicate rules
+  #  e.g.
+  #   table ip mytable
+  #   flush table ip mytable
+  #   delete table ip mytable
+  #   table ip mytable {} ...
+  apply_global: false

nftables/tasks/apply-files.yml

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+- name: Load group rules
+  command: "nft -f /etc/nftables/ansible-managed/{{ item }}.nft"
+  loop: "{{ combined_rules | list }}"
+  when: not nftables.apply_global
+
+- name: Load global rule file
+  command: "nft -f /etc/nftables.nft"
+  when: nftables.apply_global

nftables/tasks/deploy-rules/main.yml

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+- name: Deploying group files
+  include_tasks: ./per-group-template-file.yml
+  with_items:
+    - "{{ nftables.rules.files | list }}"
+
+- name: Deploying group raw-files
+  include_tasks: ./per-group-template.yml
+  with_items:
+    - "{{ nftables.rules.raw | list }}"
+
+- include_tasks: ./remove-files.yml

nftables/tasks/deploy-rules/per-group-template-file.yml

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+- set_fact:
+    group_identifier: "{{ item }}"
+    value: "{{ nftables.rules.files[item] }}"
+  when: "item is defined"
+
+  #'<group_identifier>': '<relative-location>'
+- block:
+  - name: Create main rule file
+    template:
+      src: "{{ value }}"
+      dest: "/etc/nftables/ansible-managed/{{ group_identifier }}.nft"
+  when: value is string
+
+  #'<group_identifier>':
+  #  main: <relative-location>
+  #  '<identifier>': '<relative-location>'
+- block:
+  - set_fact:
+      items: "{{ nftables.rules.files[item] }}"
+    
+  - block:
+    - name: Create main rule file
+      template:
+        src: "{{ items['main'] }}"
+        dest: "/etc/nftables/ansible-managed/{{ group_identifier }}.nft"
+
+    - name: Include rule files
+      lineinfile:
+        path: "/etc/nftables/ansible-managed/{{ group_identifier }}.nft"
+        regexp: "include\\s+(\"|')\\/etc\\/nftables\\/ansible-managed\\/{{ group_identifier }}\\/.*$"
+        line: 'include "/etc/nftables/ansible-managed/{{ group_identifier }}/*.nft"'
+    when: items['main'] is defined
+
+  - name: Create group folder
+    file:
+      path: "/etc/nftables/ansible-managed/{{ group_identifier }}/"
+      state: directory
+    when: items|length > 0
+
+  - set_fact:
+      test: "{{ items | dict2items | selectattr('key', 'ne', 'main') }}"
+
+  - name: Create included rule files
+    template:
+      src: "{{ fileItem.value }}"
+      dest: "/etc/nftables/ansible-managed/{{ group_identifier }}/{{ fileItem.key }}.nft"
+    loop: "{{ items | dict2items | selectattr('key', 'ne', 'main') }}"
+    loop_control:
+      loop_var: fileItem
+
+  when: value is mapping

nftables/tasks/deploy-rules/per-group-template.yml

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+- set_fact:
+    group_identifier: "{{ item }}"
+    value: "{{ nftables.rules.raw[item] }}"
+  when: "item is defined"
+
+  #'<group_identifier>': '<content>'
+- block:
+  - name: Create main rule file
+    copy:
+      content: "{{ value }}"
+      dest: "/etc/nftables/ansible-managed/{{ group_identifier }}.nft"
+  when: value is string
+
+  #'<group_identifier>':
+  #  main: <content>
+  #  '<identifier>': '<content>'
+- block:
+  - set_fact:
+      items: "{{ nftables.rules.raw[item] }}"
+  
+  - block:
+    - name: Create main rule file
+      copy:
+        content: "{{ items['main'] }}"
+        dest: "/etc/nftables/ansible-managed/{{ group_identifier }}.nft"
+
+    - name: Include rule files
+      lineinfile:
+        path: "/etc/nftables/ansible-managed/{{ group_identifier }}.nft"
+        regexp: "include\\s+(\"|')\\/etc\\/nftables\\/ansible-managed\\/{{ group_identifier }}\\/.*$"
+        line: 'include "/etc/nftables/ansible-managed/{{ group_identifier }}/*.nft"'
+    when: items['main'] is defined
+
+  - name: Create group folder
+    file:
+      path: "/etc/nftables/ansible-managed/{{ group_identifier }}/"
+      state: directory
+    when: items|length > 0
+
+  - name: Create included rule files
+    copy:
+      content: "{{ included_item.value }}"
+      dest: "/etc/nftables/ansible-managed/{{ group_identifier }}/{{ included_item.key }}.nft"
+    loop: "{{ items | dict2items | selectattr('key', 'ne', 'main') }}"
+    loop_control:
+      loop_var: included_item
+
+  when: value is mapping

nftables/tasks/install-package.yml

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+- name: Install Packages
+  package:
+    name:
+      - nftables

nftables/tasks/main.yml

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+- import_tasks: ./prerequisites.yml
+
+- import_tasks: ./setup-packages.yml
+
+- import_tasks: ./deploy-rules/main.yml
+
+- import_tasks: ./apply-files.yml

nftables/tasks/prerequisites.yml

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+# Defaults if missing
+- name: Set defaults if missing
+  set_fact:
+    nftables:
+      rules:
+        files: "{{ nftables.rules.files | default({}) | combine({}) }}"
+        raw: "{{ nftables.rules.raw | default({}) | combine({}) }}"
+    combined_rules: "{{ nftables.rules.raw | combine(nftables.rules.files, recursive=true) }}"
+
+#- name: Check items for consistency
+#  assert:
+#    that: "{{ nftables.rules.files.values() | length }} + {{ nftables.rules.raw.values() | length }} == {{ combined_rules.values() | length }}"
+#    fail_msg: "files and raw rules share the same identifier"

nftables/tasks/remove-files.yml

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+- name: Handle removed group files
+  block:
+  - find:
+      paths: /etc/nftables/ansible-managed/
+      file_type: 'any'
+      excludes: '{% for item in combined_rules %}{{ item }},{{ item }}.nft,{% endfor %}'
+      depth: 1
+    register: removeFiles
+
+  - file:
+      path: "{{ fileItem.path }}"
+      state: absent
+    loop: "{{ removeFiles.files }}"
+    loop_control:
+      label: "{{ fileItem.path }}"
+      loop_var: fileItem
+
+- name: Handle removed included files per group
+  include_tasks: ./remove-per-group.yml
+  with_items:
+  - "{{ combined_rules | list }}"

nftables/tasks/remove-per-group.yml

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+- set_fact:
+    group_identifier: "{{ item }}"
+    group_items: "{{ combined_rules[item] }}"
+
+- block:
+  - find:
+      paths: "/etc/nftables/ansible-managed/{{ group_identifier }}/"
+      file_type: 'any'
+      excludes: '{% for item in group_items %}{{ item }}.nft,{% endfor %}'
+    register: removeFiles
+
+  - file:
+      path: "{{ fileItem.path }}"
+      state: absent
+    loop: "{{ removeFiles.files }}"
+    loop_control:
+      label: "{{ fileItem.path }}"
+      loop_var: fileItem
+
+  when: group_items is mapping

nftables/tasks/setup-packages.yml

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+- name: Install nftables
+  package:
+    name:
+      - nftables
+
+- name: Create /etc/nftables/ansible-managed
+  file:
+    path: /etc/nftables/ansible-managed
+    state: directory
+
+- name: Include files in /etc/nftables/ansible-managed/ from /etc/nftables.conf
+  blockinfile:
+    path: /etc/nftables.conf
+    marker: "# {mark} ANSIBLE MANAGED BLOCK - nftables"
+    content: 'include "/etc/nftables/ansible-managed/*.nft"'