#!/usr/sbin/nft -f
flush ruleset

define NET4_SERVER = {{ hostvars['fw']['network4']['subnet']['server'] }}
define NET6_SERVER = {{ hostvars['fw']['network6']['subnet']['server'] }}
define HOSTS4_CONSOLE = { {{ hostvars['fw']['network4']['console'].values() | join(', ') }} }
define HOSTS6_CONSOLE = { {{ hostvars['fw']['network6']['console'].values() | join(', ') }} }
define HOSTS4_INFRA = {{ hostvars['fw']['network4']['infra']['server'] }}
define HOSTS6_INFRA = {{ hostvars['fw']['network6']['infra']['server'] }}
define HOSTS4_APP = {{ hostvars['fw']['network4']['app']['server'] }}
define HOSTS6_APP = {{ hostvars['fw']['network6']['app']['server'] }}
define PORTS_SSH = 22
define PORTS_HTTPS = 443
define PORTS_KOPIA = {{ services['kopia']['ports']['https'] }}

table inet nat {
    chain prerouting {
        type nat hook prerouting priority dstnat; policy accept;
        tcp dport $PORTS_HTTPS dnat to :$PORTS_KOPIA comment "dnat https ports to $PORTS_KOPIA"
    }
    chain postrouting {

    }
    chain output {
        type nat hook output priority dstnat; policy accept;
        oifname "lo" tcp dport $PORTS_HTTPS dnat to :$PORTS_KOPIA comment "dnat https ports to $PORTS_KOPIA out of LOCALHOST"
    }
}

table inet filter {
    chain input {
        type filter hook input priority 0; policy drop;
        ct state invalid drop comment "deny invalid connection"
        ct state established, related accept comment "allow all connection already existing"
        iifname "lo" accept comment "allow local connection: BK > BK"
        meta l4proto { icmp, icmpv6 } accept comment "allow icmp connection: BK"
        ip saddr $HOSTS4_CONSOLE tcp dport $PORTS_SSH accept comment "allow ipv4 ssh connection: CONSOLE > BK"
        ip6 saddr $HOSTS6_CONSOLE tcp dport $PORTS_SSH accept comment "allow ipv6 ssh connection: CONSOLE > BK"
        ip saddr { $HOSTS4_CONSOLE, $HOSTS4_INFRA, $HOSTS4_APP } tcp dport $PORTS_KOPIA ct original proto-dst $PORTS_HTTPS accept comment "allow ipv4 https connection: > BK"
        ip6 saddr { $HOSTS6_CONSOLE, $HOSTS6_INFRA, $HOSTS6_APP } tcp dport $PORTS_KOPIA ct original proto-dst $PORTS_HTTPS accept comment "allow ipv6 https connection: > BK"
    }
    chain forward {
        type filter hook forward priority 0; policy drop;
    }
    chain output {
        type filter hook output priority 0; policy accept;
    }
}