ansible-ffibk/roles/network-iptables-gateway/templates/rules.v4.j2

#
# {{ ansible_managed }}
#
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -d {{ ansible_default_ipv4.address | ipaddr('public') }}/32 -p gre -j ACCEPT
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
{% for mesh_id, mesh_value in meshes.iteritems() %}
-A FORWARD -i {{ mesh_id }}BR -o {{ mesh_id }}BR -j ACCEPT
{% endfor %}
-A FORWARD -m conntrack --ctstate INVALID -j DROP
-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A OUTPUT -s {{ ansible_default_ipv4.address | ipaddr('public') }}/32 -p gre -j ACCEPT
-A OUTPUT -m conntrack --ctstate INVALID -j DROP
-A OUTPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
COMMIT
*mangle
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -o ffrl+ -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss ! --mss 0:{{ internet_exit_mtu_ipv4 }} -j TCPMSS --set-mss {{ internet_exit_mtu_ipv4 }}
COMMIT
*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
:ffrl-nat - [0:0]
{% for mesh_id, mesh_value in meshes.iteritems() %}
-A POSTROUTING -s {{ mesh_value.ipv4_network | ipaddr('private') | ipaddr('net') }} -o ffrl+ -j ffrl-nat
{% endfor %}
-A ffrl-nat -o ffrl+ -j SNAT --to-source {{ ffrl_public_ipv4_nat | ipaddr('address') }}
COMMIT