Additional rules for podman root containers

REFERENCE.md

@@ -76,6 +76,11 @@ and Manager Daemons (MGR).
 * [`nftables::rules::out::tor`](#nftables--rules--out--tor): manage out tor
 * [`nftables::rules::out::whois`](#nftables--rules--out--whois): allow clients to query remote whois server
 * [`nftables::rules::out::wireguard`](#nftables--rules--out--wireguard): manage out wireguard
+* [`nftables::rules::podman`](#nftables--rules--podman): Rules for Podman, a tool for managing OCI containers and pods.
+This class defines additional forwarding rules to let root containers
+reach external networks when using Netavark (since v4.0) or CNI (deprecated).
+At the time of writing, Podman supports automatic configuration
+of firewall rules with iptables and firewalld only.
 * [`nftables::rules::puppet`](#nftables--rules--puppet): manage in puppet
 * [`nftables::rules::pxp_agent`](#nftables--rules--pxp_agent): manage in pxp-agent
 * [`nftables::rules::qemu`](#nftables--rules--qemu): Bridged network configuration for qemu/libvirt
@@ -1190,6 +1195,14 @@ specify wireguard ports
 
 Default value: `[51820]`
 
+### <a name="nftables--rules--podman"></a>`nftables::rules::podman`
+
+Rules for Podman, a tool for managing OCI containers and pods.
+This class defines additional forwarding rules to let root containers
+reach external networks when using Netavark (since v4.0) or CNI (deprecated).
+At the time of writing, Podman supports automatic configuration
+of firewall rules with iptables and firewalld only.
+
 ### <a name="nftables--rules--puppet"></a>`nftables::rules::puppet`
 
 manage in puppet

manifests/rules/podman.pp

@@ -0,0 +1,17 @@
+# @summary 
+#  Rules for Podman, a tool for managing OCI containers and pods.
+#  This class defines additional forwarding rules to let root containers
+#  reach external networks when using Netavark (since v4.0) or CNI (deprecated).
+#  At the time of writing, Podman supports automatic configuration
+#  of firewall rules with iptables and firewalld only.
+#
+class nftables::rules::podman {
+  nftables::rule {
+    'default_fwd-podman_establised':
+      content => 'ip daddr 10.88.0.0/16 ct state related,established accept',
+  }
+  nftables::rule {
+    'default_fwd-podman_accept':
+      content => 'ip saddr 10.88.0.0/16 accept',
+  }
+}

spec/acceptance/all_rules_spec.rb

@@ -26,6 +26,7 @@ class { 'nftables':
       include nftables::rules::dhcpv6_client
       include nftables::rules::afs3_callback
       include nftables::rules::ospf
+      include nftables::rules::podman
       include nftables::rules::http
       include nftables::rules::puppet
       include nftables::rules::pxp_agent

spec/classes/rules/podman_spec.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'nftables::rules::podman' do
+  on_supported_os.each do |os, os_facts|
+    context "on #{os}" do
+      let(:facts) { os_facts }
+
+      context 'default options' do
+        it { is_expected.to compile }
+        it { is_expected.to contain_nftables__rule('default_fwd-podman_establised').with_content('ip daddr 10.88.0.0/16 ct state related,established accept') }
+        it { is_expected.to contain_nftables__rule('default_fwd-podman_accept').with_content('ip saddr 10.88.0.0/16 accept') }
+      end
+    end
+  end
+end