Persist iptables rules

We configured iptables rules but did not persist them.
This meant that rules would be flushed when restarting iptables or
the instance.

Change-Id: I9d90f55323a33d6a0f0dda1f7ab25d10984fa6cb

roles/multi-node-bridge/tasks/main.yaml

@@ -14,3 +14,7 @@
     PATH: "{{ ansible_env.PATH }}:/sbin:/usr/sbin"
   when: inventory_hostname in groups['peers']
   static: no
+
+- name: Persist iptables rules
+  include_role:
+    name: persistent-firewall

roles/multi-node-firewall/tasks/main.yaml

@@ -37,6 +37,7 @@
     source: "{{ item }}"
     jump: ACCEPT
   with_items: "{{ ipv6_addresses }}"
-  when:
-    - ipv6_addresses is defined
-    - ipv6_addresses
+
+- name: Persist iptables rules
+  include_role:
+    name: persistent-firewall

roles/persistent-firewall/README.rst

@@ -0,0 +1,4 @@
+Saves current iptables rules for both ipv4 and ipv6 and makes them persistent
+so that they are available if iptables or the instance is restarted.
+
+This role can be re-used more than once in order to persist new rules.

roles/persistent-firewall/tasks/main.yaml

@@ -0,0 +1,22 @@
+- name: List current ipv4 rules
+  become: yes
+  command: iptables-save
+  changed_when: false
+  failed_when: false
+  register: iptables_rules
+
+- name: List current ipv6 rules
+  become: yes
+  command: ip6tables-save
+  changed_when: false
+  failed_when: false
+  register: ip6tables_rules
+
+- name: Configure persistent iptables rules
+  include: "{{ item }}"
+  static: no
+  with_first_found:
+    - "persist/{{ ansible_distribution }}_{{ ansible_distribution_release }}.yaml"
+    - "persist/{{ ansible_distribution }}.yaml"
+    - "persist/{{ ansible_os_family }}.yaml"
+    - "persist/default.yaml"

roles/persistent-firewall/tasks/persist/Debian.yaml

@@ -0,0 +1,24 @@
+- name: Install iptables-persistent
+  become: yes
+  package:
+    name: iptables-persistent
+    state: installed
+
+- name: Persist ipv4 rules
+  become: yes
+  copy:
+    content: "{{ iptables_rules.stdout }}"
+    dest: "/etc/iptables/rules.v4"
+
+- name: Persist ipv6 rules
+  become: yes
+  copy:
+    content: "{{ ip6tables_rules.stdout }}"
+    dest: "/etc/iptables/rules.v6"
+
+- name: Ensure netfilter-persistent is started
+  become: yes
+  service:
+    name: netfilter-persistent
+    state: started
+    enabled: yes

roles/persistent-firewall/tasks/persist/RedHat.yaml

@@ -0,0 +1,18 @@
+- name: Persist ipv4 rules
+  become: yes
+  copy:
+    content: "{{ iptables_rules.stdout }}"
+    dest: "/etc/sysconfig/iptables"
+
+- name: Persist ipv6 rules
+  become: yes
+  copy:
+    content: "{{ ip6tables_rules.stdout }}"
+    dest: "/etc/sysconfig/ip6tables"
+
+- name: Ensure iptables is started
+  become: yes
+  service:
+    name: iptables
+    state: started
+    enabled: yes

roles/persistent-firewall/tasks/persist/Suse.yaml

@@ -0,0 +1,36 @@
+- name: Persist ipv4 rules
+  become: yes
+  copy:
+    content: "{{ iptables_rules.stdout }}"
+    dest: "/etc/sysconfig/iptables"
+
+- name: Persist ipv6 rules
+  become: yes
+  copy:
+    content: "{{ ip6tables_rules.stdout }}"
+    dest: "/etc/sysconfig/ip6tables"
+
+- name: Set up SuSEfirewall2 custom rules to be loaded
+  become: yes
+  replace:
+    path: /etc/sysconfig/SuSEfirewall2
+    regexp: '^FW_CUSTOMRULES=.*$'
+    replace: 'FW_CUSTOMRULES="/etc/sysconfig/scripts/SuSEfirewall2-custom"'
+
+- name: Configure SuSEfirewall2 to restore saved rules on restart
+  become: yes
+  blockinfile:
+    path: /etc/sysconfig/scripts/SuSEfirewall2-custom
+    insertafter: EOF
+    content: |
+      fw_custom_after_finished() {
+          /usr/sbin/iptables-restore /etc/sysconfig/iptables
+          /usr/sbin/ip6tables-restore /etc/sysconfig/ip6tables
+      }
+
+- name: Ensure SuSEfirewall2 is started
+  become: yes
+  service:
+    name: SuSEfirewall2
+    state: started
+    enabled: yes

roles/persistent-firewall/tasks/persist/Ubuntu_trusty.yaml

@@ -0,0 +1,24 @@
+- name: Install iptables-persistent
+  become: yes
+  package:
+    name: iptables-persistent
+    state: installed
+
+- name: Persist ipv4 rules
+  become: yes
+  copy:
+    content: "{{ iptables_rules.stdout }}"
+    dest: "/etc/iptables/rules.v4"
+
+- name: Persist ipv6 rules
+  become: yes
+  copy:
+    content: "{{ ip6tables_rules.stdout }}"
+    dest: "/etc/iptables/rules.v6"
+
+- name: Ensure iptables-persistent is started
+  become: yes
+  service:
+    name: iptables-persistent
+    state: started
+    enabled: yes

roles/persistent-firewall/tasks/persist/default.yaml

@@ -0,0 +1,5 @@
+- name: Warn about unsupported distribution
+  debug:
+    msg: >
+      WARNING: {{ ansible_distribution }} is not supported by this role yet.
+      The execution of the job will continue without persisting iptables rules.