iptables: switch from iptables-legacy to iptables-nftables-compat #81172

misuzu · 2020-02-27T11:01:07Z

Motivation for this change

iptables-nftables-compat transparently converts iptables rules to nft rules. This should ease the migration to nftables.
Debian and Fedora already switched to iptables-nftables-compat by default.

Related: #23181
https://wiki.nftables.org/wiki-nftables/index.php/Moving_from_iptables_to_nftables
https://www.redhat.com/en/blog/using-iptables-nft-hybrid-linux-firewall

Things done

misuzu · 2020-02-28T12:54:43Z

This is how it looks like on my NAS:

% iptables-save
# Generated by iptables-save v1.8.4 on Fri Feb 28 14:46:29 2020
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:nixos-fw-accept - [0:0]
:nixos-fw-refuse - [0:0]
:nixos-fw-log-refuse - [0:0]
:nixos-fw - [0:0]
:DOCKER - [0:0]
:DOCKER-ISOLATION-STAGE-1 - [0:0]
:DOCKER-ISOLATION-STAGE-2 - [0:0]
:DOCKER-USER - [0:0]
-A INPUT -s X.X.X.X/32 -p tcp -m tcp --dport 6600 -j ACCEPT
-A INPUT -s X.X.X.X/32 -p tcp -m tcp --dport 6600 -j ACCEPT
-A INPUT -s X.X.X.X/32 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -s X.X.X.X/32 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -j nixos-fw
-A FORWARD -j DOCKER-USER
-A FORWARD -j DOCKER-ISOLATION-STAGE-1
-A FORWARD -o docker0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -o docker0 -j DOCKER
-A FORWARD -i docker0 ! -o docker0 -j ACCEPT
-A FORWARD -i docker0 -o docker0 -j ACCEPT
-A nixos-fw-accept -j ACCEPT
-A nixos-fw-refuse -p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j REJECT --reject-with tcp-reset
-A nixos-fw-refuse -j REJECT --reject-with icmp-port-unreachable
-A nixos-fw-log-refuse -m pkttype ! --pkt-type unicast -j nixos-fw-refuse
-A nixos-fw-log-refuse -j nixos-fw-refuse
-A nixos-fw -i docker0 -j nixos-fw-accept
-A nixos-fw -i docker0 -j nixos-fw-accept
-A nixos-fw -i ztuze5qw7u -j nixos-fw-accept
-A nixos-fw -i wg0 -j nixos-fw-accept
-A nixos-fw -i lo -j nixos-fw-accept
-A nixos-fw -m conntrack --ctstate RELATED,ESTABLISHED -j nixos-fw-accept
-A nixos-fw -p tcp -m tcp --dport 25565 -j nixos-fw-accept
-A nixos-fw -p tcp -m tcp --dport 37031 -j nixos-fw-accept
-A nixos-fw -p udp -m udp --dport 9993 -j nixos-fw-accept
-A nixos-fw -p udp -m udp --dport 25565 -j nixos-fw-accept
-A nixos-fw -p udp -m udp --dport 37031 -j nixos-fw-accept
-A nixos-fw -p udp -m udp --dport 51820 -j nixos-fw-accept
-A nixos-fw -p icmp -m icmp --icmp-type 8 -j nixos-fw-accept
-A nixos-fw -j nixos-fw-log-refuse
-A DOCKER-ISOLATION-STAGE-1 -i docker0 ! -o docker0 -j DOCKER-ISOLATION-STAGE-2
-A DOCKER-ISOLATION-STAGE-1 -j RETURN
-A DOCKER-ISOLATION-STAGE-2 -o docker0 -j DROP
-A DOCKER-ISOLATION-STAGE-2 -j RETURN
-A DOCKER-USER -j RETURN
COMMIT
# Completed on Fri Feb 28 14:46:29 2020
# Generated by iptables-save v1.8.4 on Fri Feb 28 14:46:29 2020
*raw
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:nixos-fw-rpfilter - [0:0]
-A PREROUTING -j nixos-fw-rpfilter
-A nixos-fw-rpfilter -m rpfilter --validmark -j RETURN
-A nixos-fw-rpfilter -p udp -m udp --sport 67 --dport 68 -j RETURN
-A nixos-fw-rpfilter -s 0.0.0.0/32 -d 255.255.255.255/32 -p udp -m udp --sport 68 --dport 67 -j RETURN
-A nixos-fw-rpfilter -j DROP
COMMIT
# Completed on Fri Feb 28 14:46:29 2020
# Generated by iptables-save v1.8.4 on Fri Feb 28 14:46:29 2020
*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:nixos-nat-pre - [0:0]
:nixos-nat-post - [0:0]
:nixos-nat-out - [0:0]
:DOCKER - [0:0]
-A PREROUTING -j nixos-nat-pre
-A PREROUTING -m addrtype --dst-type LOCAL -j DOCKER
-A POSTROUTING -s 172.17.0.0/16 ! -o docker0 -j MASQUERADE
-A POSTROUTING -j nixos-nat-post
-A OUTPUT -j nixos-nat-out
-A OUTPUT ! -d 127.0.0.0/8 -m addrtype --dst-type LOCAL -j DOCKER
-A nixos-nat-pre -i wg0 -j MARK --set-xmark 0x1/0xffffffff
-A nixos-nat-post -m mark --mark 0x1 -j MASQUERADE
-A nixos-nat-post -s 10.100.0.0/24 -j MASQUERADE
-A DOCKER -i docker0 -j RETURN
COMMIT
# Completed on Fri Feb 28 14:46:29 2020
% ip6tables-save
# Generated by ip6tables-save v1.8.4 on Fri Feb 28 14:46:35 2020
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:nixos-fw-accept - [0:0]
:nixos-fw-refuse - [0:0]
:nixos-fw-log-refuse - [0:0]
:nixos-fw - [0:0]
-A INPUT -j nixos-fw
-A nixos-fw-accept -j ACCEPT
-A nixos-fw-refuse -p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j REJECT --reject-with tcp-reset
-A nixos-fw-refuse -j REJECT --reject-with icmp6-port-unreachable
-A nixos-fw-log-refuse -m pkttype ! --pkt-type unicast -j nixos-fw-refuse
-A nixos-fw-log-refuse -j nixos-fw-refuse
-A nixos-fw -i docker0 -j nixos-fw-accept
-A nixos-fw -i docker0 -j nixos-fw-accept
-A nixos-fw -i ztuze5qw7u -j nixos-fw-accept
-A nixos-fw -i wg0 -j nixos-fw-accept
-A nixos-fw -i lo -j nixos-fw-accept
-A nixos-fw -m conntrack --ctstate RELATED,ESTABLISHED -j nixos-fw-accept
-A nixos-fw -p tcp -m tcp --dport 25565 -j nixos-fw-accept
-A nixos-fw -p tcp -m tcp --dport 37031 -j nixos-fw-accept
-A nixos-fw -p udp -m udp --dport 9993 -j nixos-fw-accept
-A nixos-fw -p udp -m udp --dport 25565 -j nixos-fw-accept
-A nixos-fw -p udp -m udp --dport 37031 -j nixos-fw-accept
-A nixos-fw -p udp -m udp --dport 51820 -j nixos-fw-accept
-A nixos-fw -p ipv6-icmp -m icmp6 --icmpv6-type 137 -j DROP
-A nixos-fw -p ipv6-icmp -m icmp6 --icmpv6-type 139 -j DROP
-A nixos-fw -p ipv6-icmp -j nixos-fw-accept
-A nixos-fw -d fe80::/64 -p udp -m udp --dport 546 -j nixos-fw-accept
-A nixos-fw -j nixos-fw-log-refuse
COMMIT
# Completed on Fri Feb 28 14:46:35 2020
# Generated by ip6tables-save v1.8.4 on Fri Feb 28 14:46:35 2020
*raw
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:nixos-fw-rpfilter - [0:0]
-A PREROUTING -j nixos-fw-rpfilter
-A nixos-fw-rpfilter -m rpfilter --validmark -j RETURN
-A nixos-fw-rpfilter -j DROP
COMMIT
# Completed on Fri Feb 28 14:46:35 2020
# Generated by ip6tables-save v1.8.4 on Fri Feb 28 14:46:35 2020
*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:nixos-nat-pre - [0:0]
:nixos-nat-post - [0:0]
:nixos-nat-out - [0:0]
-A PREROUTING -j nixos-nat-pre
-A POSTROUTING -j nixos-nat-post
-A OUTPUT -j nixos-nat-out
COMMIT
# Completed on Fri Feb 28 14:46:35 2020
% nft list ruleset
table ip filter {
    chain INPUT {
        type filter hook input priority filter; policy accept;
        meta l4proto tcp ip saddr X.X.X.X # xt_tcp counter packets 0 bytes 0 accept
        meta l4proto tcp ip saddr X.X.X.X # xt_tcp counter packets 0 bytes 0 accept
        meta l4proto tcp ip saddr X.X.X.X # xt_tcp counter packets 0 bytes 0 accept
        meta l4proto tcp ip saddr X.X.X.X # xt_tcp counter packets 0 bytes 0 accept
        counter packets 3731 bytes 448421 jump nixos-fw
    }

    chain FORWARD {
        type filter hook forward priority filter; policy accept;
        counter packets 0 bytes 0 jump DOCKER-USER
        counter packets 0 bytes 0 jump DOCKER-ISOLATION-STAGE-1
        oifname "docker0" # xt_conntrack counter packets 0 bytes 0 accept
        oifname "docker0" counter packets 0 bytes 0 jump DOCKER
        iifname "docker0" oifname != "docker0" counter packets 0 bytes 0 accept
        iifname "docker0" oifname "docker0" counter packets 0 bytes 0 accept
    }

    chain OUTPUT {
        type filter hook output priority filter; policy accept;
    }

    chain nixos-fw-accept {
        counter packets 3602 bytes 428635 accept
    }

    chain nixos-fw-refuse {
        meta l4proto tcp # xt_tcp counter packets 5 bytes 200 # xt_REJECT
        counter packets 124 bytes 19586 # xt_REJECT
    }

    chain nixos-fw-log-refuse {
        # xt_pkttype counter packets 45 bytes 6295 jump nixos-fw-refuse
        counter packets 84 bytes 13491 jump nixos-fw-refuse
    }

    chain nixos-fw {
        iifname "docker0" counter packets 0 bytes 0 jump nixos-fw-accept
        iifname "docker0" counter packets 0 bytes 0 jump nixos-fw-accept
        iifname "ztuze5qw7u" counter packets 60 bytes 3600 jump nixos-fw-accept
        iifname "wg0" counter packets 0 bytes 0 jump nixos-fw-accept
        iifname "lo" counter packets 285 bytes 29689 jump nixos-fw-accept
        # xt_conntrack counter packets 1749 bytes 273556 jump nixos-fw-accept
        meta l4proto tcp # xt_tcp counter packets 0 bytes 0 jump nixos-fw-accept
        meta l4proto tcp # xt_tcp counter packets 671 bytes 35032 jump nixos-fw-accept
        meta l4proto udp # xt_udp counter packets 4 bytes 602 jump nixos-fw-accept
        meta l4proto udp # xt_udp counter packets 0 bytes 0 jump nixos-fw-accept
        meta l4proto udp # xt_udp counter packets 832 bytes 86072 jump nixos-fw-accept
        meta l4proto udp # xt_udp counter packets 0 bytes 0 jump nixos-fw-accept
        meta l4proto icmp # xt_icmp counter packets 1 bytes 84 jump nixos-fw-accept
        counter packets 129 bytes 19786 jump nixos-fw-log-refuse
    }

    chain DOCKER {
    }

    chain DOCKER-ISOLATION-STAGE-1 {
        iifname "docker0" oifname != "docker0" counter packets 0 bytes 0 jump DOCKER-ISOLATION-STAGE-2
        counter packets 0 bytes 0 return
    }

    chain DOCKER-ISOLATION-STAGE-2 {
        oifname "docker0" counter packets 0 bytes 0 drop
        counter packets 0 bytes 0 return
    }

    chain DOCKER-USER {
        counter packets 0 bytes 0 return
    }
}
table ip6 filter {
    chain INPUT {
        type filter hook input priority filter; policy accept;
        counter packets 1555 bytes 118695 jump nixos-fw
    }

    chain FORWARD {
        type filter hook forward priority filter; policy accept;
    }

    chain OUTPUT {
        type filter hook output priority filter; policy accept;
    }

    chain nixos-fw-accept {
        counter packets 1555 bytes 118695 accept
    }

    chain nixos-fw-refuse {
        meta l4proto tcp # xt_tcp counter packets 0 bytes 0 # xt_REJECT
        counter packets 0 bytes 0 # xt_REJECT
    }

    chain nixos-fw-log-refuse {
        # xt_pkttype counter packets 0 bytes 0 jump nixos-fw-refuse
        counter packets 0 bytes 0 jump nixos-fw-refuse
    }

    chain nixos-fw {
        iifname "docker0" counter packets 0 bytes 0 jump nixos-fw-accept
        iifname "docker0" counter packets 0 bytes 0 jump nixos-fw-accept
        iifname "ztuze5qw7u" counter packets 1435 bytes 110239 jump nixos-fw-accept
        iifname "wg0" counter packets 0 bytes 0 jump nixos-fw-accept
        iifname "lo" counter packets 120 bytes 8456 jump nixos-fw-accept
        # xt_conntrack counter packets 0 bytes 0 jump nixos-fw-accept
        meta l4proto tcp # xt_tcp counter packets 0 bytes 0 jump nixos-fw-accept
        meta l4proto tcp # xt_tcp counter packets 0 bytes 0 jump nixos-fw-accept
        meta l4proto udp # xt_udp counter packets 0 bytes 0 jump nixos-fw-accept
        meta l4proto udp # xt_udp counter packets 0 bytes 0 jump nixos-fw-accept
        meta l4proto udp # xt_udp counter packets 0 bytes 0 jump nixos-fw-accept
        meta l4proto udp # xt_udp counter packets 0 bytes 0 jump nixos-fw-accept
        meta l4proto ipv6-icmp # xt_icmp6 counter packets 0 bytes 0 drop
        meta l4proto ipv6-icmp # xt_icmp6 counter packets 0 bytes 0 drop
        meta l4proto ipv6-icmp counter packets 0 bytes 0 jump nixos-fw-accept
        meta l4proto udp ip6 daddr fe80::/64 # xt_udp counter packets 0 bytes 0 jump nixos-fw-accept
        counter packets 0 bytes 0 jump nixos-fw-log-refuse
    }
}
table ip raw {
    chain PREROUTING {
        type filter hook prerouting priority raw; policy accept;
        counter packets 3780 bytes 454717 jump nixos-fw-rpfilter
    }

    chain OUTPUT {
        type filter hook output priority raw; policy accept;
    }

    chain nixos-fw-rpfilter {
        # xt_rpfilter counter packets 3776 bytes 454040 return
        meta l4proto udp # xt_udp counter packets 0 bytes 0 return
        meta l4proto udp ip saddr 0.0.0.0 ip daddr 255.255.255.255 # xt_udp counter packets 0 bytes 0 return
        counter packets 4 bytes 677 drop
    }
}
table ip6 raw {
    chain PREROUTING {
        type filter hook prerouting priority raw; policy accept;
        counter packets 1555 bytes 118695 jump nixos-fw-rpfilter
    }

    chain OUTPUT {
        type filter hook output priority raw; policy accept;
    }

    chain nixos-fw-rpfilter {
        # xt_rpfilter counter packets 1555 bytes 118695 return
        counter packets 0 bytes 0 drop
    }
}
table ip nat {
    chain PREROUTING {
        type nat hook prerouting priority dstnat; policy accept;
        counter packets 1423 bytes 121656 jump nixos-nat-pre
        # xt_addrtype counter packets 675 bytes 51804 jump DOCKER
    }

    chain INPUT {
        type nat hook input priority 100; policy accept;
    }

    chain POSTROUTING {
        type nat hook postrouting priority srcnat; policy accept;
        oifname != "docker0" ip saddr 172.17.0.0/16 counter packets 0 bytes 0 # xt_MASQUERADE
        counter packets 271 bytes 25574 jump nixos-nat-post
    }

    chain OUTPUT {
        type nat hook output priority -100; policy accept;
        counter packets 271 bytes 25574 jump nixos-nat-out
        ip daddr != 127.0.0.0/8 # xt_addrtype counter packets 0 bytes 0 jump DOCKER
    }

    chain nixos-nat-pre {
        iifname "wg0" counter packets 0 bytes 0 # xt_MARK
    }

    chain nixos-nat-post {
        # xt_mark counter packets 0 bytes 0 # xt_MASQUERADE
        ip saddr 10.100.0.0/24 counter packets 21 bytes 3465 # xt_MASQUERADE
    }

    chain nixos-nat-out {
    }

    chain DOCKER {
        iifname "docker0" counter packets 0 bytes 0 return
    }
}
table ip6 nat {
    chain PREROUTING {
        type nat hook prerouting priority dstnat; policy accept;
        counter packets 61 bytes 4960 jump nixos-nat-pre
    }

    chain INPUT {
        type nat hook input priority 100; policy accept;
    }

    chain POSTROUTING {
        type nat hook postrouting priority srcnat; policy accept;
        counter packets 61 bytes 4840 jump nixos-nat-post
    }

    chain OUTPUT {
        type nat hook output priority -100; policy accept;
        counter packets 61 bytes 4840 jump nixos-nat-out
    }

    chain nixos-nat-pre {
    }

    chain nixos-nat-post {
    }

    chain nixos-nat-out {
    }
}

Note that some entries is not displayed correctly.

misuzu · 2020-02-29T09:49:58Z

nft list ruleset should work properly now:

% nft list ruleset
table ip filter {
	chain INPUT {
		type filter hook input priority filter; policy accept;
		meta l4proto tcp ip saddr X.X.X.X tcp dport 6600 counter packets 0 bytes 0 accept
		meta l4proto tcp ip saddr X.X.X.X tcp dport 6600 counter packets 947 bytes 72714 accept
		meta l4proto tcp ip saddr X.X.X.X tcp dport 22 counter packets 0 bytes 0 accept
		meta l4proto tcp ip saddr X.X.X.X tcp dport 22 counter packets 0 bytes 0 accept
		counter packets 105754692 bytes 7736336680 jump nixos-fw
	}

	chain FORWARD {
		type filter hook forward priority filter; policy accept;
		counter packets 635548 bytes 558895063 jump DOCKER-USER
		counter packets 635548 bytes 558895063 jump DOCKER-ISOLATION-STAGE-1
		oifname "docker0" ct state related,established counter packets 237579 bytes 345586224 accept
		oifname "docker0" counter packets 0 bytes 0 jump DOCKER
		iifname "docker0" oifname != "docker0" counter packets 153745 bytes 21586807 accept
		iifname "docker0" oifname "docker0" counter packets 0 bytes 0 accept
	}

	chain OUTPUT {
		type filter hook output priority filter; policy accept;
	}

	chain nixos-fw-accept {
		counter packets 105587858 bytes 7722170131 accept
	}

	chain nixos-fw-refuse {
		meta l4proto tcp tcp flags & (fin|syn|rst|ack) != syn counter packets 19533 bytes 1354709 reject with tcp reset
		counter packets 147301 bytes 12811840 reject
	}

	chain nixos-fw-log-refuse {
		pkttype != unicast counter packets 53770 bytes 7484137 jump nixos-fw-refuse
		counter packets 113064 bytes 6682412 jump nixos-fw-refuse
	}

	chain nixos-fw {
		iifname "docker0" counter packets 739 bytes 47466 jump nixos-fw-accept
		iifname "docker0" counter packets 0 bytes 0 jump nixos-fw-accept
		iifname "ztuze5qw7u" counter packets 1811581 bytes 95121262 jump nixos-fw-accept
		iifname "wg0" counter packets 0 bytes 0 jump nixos-fw-accept
		iifname "lo" counter packets 326853 bytes 51586185 jump nixos-fw-accept
		ct state related,established counter packets 102619721 bytes 7501147392 jump nixos-fw-accept
		meta l4proto tcp tcp dport 25565 counter packets 0 bytes 0 jump nixos-fw-accept
		meta l4proto tcp tcp dport 37031 counter packets 231280 bytes 12622792 jump nixos-fw-accept
		meta l4proto udp udp dport 9993 counter packets 2202 bytes 130465 jump nixos-fw-accept
		meta l4proto udp udp dport 25565 counter packets 0 bytes 0 jump nixos-fw-accept
		meta l4proto udp udp dport 37031 counter packets 594480 bytes 61452711 jump nixos-fw-accept
		meta l4proto udp udp dport 51820 counter packets 5 bytes 1044 jump nixos-fw-accept
		meta l4proto icmp icmp type echo-request counter packets 997 bytes 60814 jump nixos-fw-accept
		counter packets 166834 bytes 14166549 jump nixos-fw-log-refuse
	}

	chain DOCKER {
	}

	chain DOCKER-ISOLATION-STAGE-1 {
		iifname "docker0" oifname != "docker0" counter packets 153745 bytes 21586807 jump DOCKER-ISOLATION-STAGE-2
		counter packets 635548 bytes 558895063 return
	}

	chain DOCKER-ISOLATION-STAGE-2 {
		oifname "docker0" counter packets 0 bytes 0 drop
		counter packets 153745 bytes 21586807 return
	}

	chain DOCKER-USER {
		counter packets 635548 bytes 558895063 return
	}
}
table ip6 filter {
	chain INPUT {
		type filter hook input priority filter; policy accept;
		counter packets 3938252 bytes 823985400 jump nixos-fw
	}

	chain FORWARD {
		type filter hook forward priority filter; policy accept;
	}

	chain OUTPUT {
		type filter hook output priority filter; policy accept;
	}

	chain nixos-fw-accept {
		counter packets 3938239 bytes 823984620 accept
	}

	chain nixos-fw-refuse {
		meta l4proto tcp tcp flags & (fin|syn|rst|ack) != syn counter packets 13 bytes 780 reject with tcp reset
		counter packets 0 bytes 0 reject
	}

	chain nixos-fw-log-refuse {
		pkttype != unicast counter packets 0 bytes 0 jump nixos-fw-refuse
		counter packets 13 bytes 780 jump nixos-fw-refuse
	}

	chain nixos-fw {
		iifname "docker0" counter packets 0 bytes 0 jump nixos-fw-accept
		iifname "docker0" counter packets 0 bytes 0 jump nixos-fw-accept
		iifname "ztuze5qw7u" counter packets 1548445 bytes 111985631 jump nixos-fw-accept
		iifname "wg0" counter packets 0 bytes 0 jump nixos-fw-accept
		iifname "lo" counter packets 120 bytes 8456 jump nixos-fw-accept
		ct state related,established counter packets 2389674 bytes 711990533 jump nixos-fw-accept
		meta l4proto tcp tcp dport 25565 counter packets 0 bytes 0 jump nixos-fw-accept
		meta l4proto tcp tcp dport 37031 counter packets 0 bytes 0 jump nixos-fw-accept
		meta l4proto udp udp dport 9993 counter packets 0 bytes 0 jump nixos-fw-accept
		meta l4proto udp udp dport 25565 counter packets 0 bytes 0 jump nixos-fw-accept
		meta l4proto udp udp dport 37031 counter packets 0 bytes 0 jump nixos-fw-accept
		meta l4proto udp udp dport 51820 counter packets 0 bytes 0 jump nixos-fw-accept
		meta l4proto ipv6-icmp icmpv6 type nd-redirect counter packets 0 bytes 0 drop
		meta l4proto ipv6-icmp icmpv6 type  counter packets 0 bytes 0 drop
		meta l4proto ipv6-icmp counter packets 0 bytes 0 jump nixos-fw-accept
		meta l4proto udp ip6 daddr fe80::/64 udp dport 546 counter packets 0 bytes 0 jump nixos-fw-accept
		counter packets 13 bytes 780 jump nixos-fw-log-refuse
	}
}
table ip raw {
	chain PREROUTING {
		type filter hook prerouting priority raw; policy accept;
		counter packets 106472347 bytes 8304773729 jump nixos-fw-rpfilter
	}

	chain OUTPUT {
		type filter hook output priority raw; policy accept;
	}

	chain nixos-fw-rpfilter {
		fib saddr . mark . iif oif != 0 counter packets 106460273 bytes 8303018760 return
		meta l4proto udp udp sport 67 udp dport 68 counter packets 0 bytes 0 return
		meta l4proto udp ip saddr 0.0.0.0 ip daddr 255.255.255.255 udp sport 68 udp dport 67 counter packets 0 bytes 0 return
		counter packets 12074 bytes 1754969 drop
	}
}
table ip6 raw {
	chain PREROUTING {
		type filter hook prerouting priority raw; policy accept;
		counter packets 3938252 bytes 823985400 jump nixos-fw-rpfilter
	}

	chain OUTPUT {
		type filter hook output priority raw; policy accept;
	}

	chain nixos-fw-rpfilter {
		fib saddr . mark . iif oif != 0 counter packets 3938252 bytes 823985400 return
		counter packets 0 bytes 0 drop
	}
}
table ip nat {
	chain PREROUTING {
		type nat hook prerouting priority dstnat; policy accept;
		counter packets 919831 bytes 86687828 jump nixos-nat-pre
		fib daddr type local counter packets 794253 bytes 71267200 jump DOCKER
	}

	chain INPUT {
		type nat hook input priority 100; policy accept;
	}

	chain POSTROUTING {
		type nat hook postrouting priority srcnat; policy accept;
		oifname != "docker0" ip saddr 172.17.0.0/16 counter packets 6475 bytes 375721 masquerade
		counter packets 738425 bytes 69618796 jump nixos-nat-post
	}

	chain OUTPUT {
		type nat hook output priority -100; policy accept;
		counter packets 742600 bytes 69808184 jump nixos-nat-out
		ip daddr != 127.0.0.0/8 fib daddr type local counter packets 22087 bytes 1262082 jump DOCKER
	}

	chain nixos-nat-pre {
		iifname "wg0" counter packets 1235 bytes 116346 meta mark set 0x1
	}

	chain nixos-nat-post {
		mark 0x1 counter packets 1235 bytes 116346 masquerade
		ip saddr 10.100.0.0/24 counter packets 33514 bytes 3395481 masquerade
	}

	chain nixos-nat-out {
	}

	chain DOCKER {
		iifname "docker0" counter packets 47 bytes 2820 return
	}
}
table ip6 nat {
	chain PREROUTING {
		type nat hook prerouting priority dstnat; policy accept;
		counter packets 1243 bytes 99416 jump nixos-nat-pre
	}

	chain INPUT {
		type nat hook input priority 100; policy accept;
	}

	chain POSTROUTING {
		type nat hook postrouting priority srcnat; policy accept;
		counter packets 65152 bytes 5212120 jump nixos-nat-post
	}

	chain OUTPUT {
		type nat hook output priority -100; policy accept;
		counter packets 65152 bytes 5212120 jump nixos-nat-out
	}

	chain nixos-nat-pre {
	}

	chain nixos-nat-post {
	}

	chain nixos-nat-out {
	}
}

Izorkin · 2020-04-02T06:44:22Z

Сhecked on home server - working.

pkgs/top-level/all-packages.nix

Mic92 · 2020-04-28T08:32:32Z

Can you give this a rebase? Than I will merge it.

misuzu · 2020-04-28T08:37:50Z

Can you give this a rebase? Than I will merge it.

Done!

pkgs/top-level/all-packages.nix

Mic92 · 2020-04-28T09:07:05Z

A different question are IPMasquerade in systemd-networkd: It does not use the iptables binaries but uses a library. Will it still work? cc @flokli

Mic92 · 2020-04-28T09:16:44Z

systemd uses libiptc. If that library also performs the translation, we are good.

flokli · 2021-10-12T10:39:52Z

Let's see what this will break 😆

Izorkin · 2021-11-02T07:47:20Z

сс @misuzu @flokli for some reason this change is not in the master branch:

commit 311806c044ae787b182fa919ea14467adafd6fbb
Author:     misuzu <bakalolka@gmail.com>
AuthorDate: Wed Sep 15 08:57:19 2021 +0300
Commit:     Izorkin <izorkin@elven.pw>
CommitDate: Tue Nov 2 10:36:46 2021 +0300

    nixos/libvirtd: use /etc/ethertypes from iptables package
---
 nixos/modules/virtualisation/libvirtd.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nixos/modules/virtualisation/libvirtd.nix b/nixos/modules/virtualisation/libvirtd.nix
index 121e7286bc1..ab87394a30e 100644
--- a/nixos/modules/virtualisation/libvirtd.nix
+++ b/nixos/modules/virtualisation/libvirtd.nix
@@ -254,7 +254,7 @@ in
           "allow ${e}")
         cfg.allowedBridges;
       systemPackages = with pkgs; [ libressl.nc iptables cfg.package cfg.qemu.package ];
-      etc.ethertypes.source = "${pkgs.ebtables}/etc/ethertypes";
+      etc.ethertypes.source = "${pkgs.iptables}/etc/ethertypes";
     };

     boot.kernelModules = [ "tun" ];

Izorkin · 2021-11-02T08:09:40Z

сс @misuzu other change has all reached the master branch?

misuzu · 2021-11-02T08:18:55Z

сс @misuzu other change has all reached the master branch?

Other changes seem to be there.

flokli · 2021-11-02T09:18:04Z

Maybe something went wrong when resolving conflicts during the staging cycle. Can you file a PR towards master, that brings this again? (Linking to the context here in the commit message)

This change is part of NixOS#81172 and must have been lost during staging cycle.

ofborg bot requested a review from lovek323 February 27, 2020 11:10

ofborg bot added 10.rebuild-darwin: 101-500 10.rebuild-linux: 501+ 10.rebuild-linux: 5001+ labels Feb 27, 2020

misuzu changed the base branch from master to staging February 28, 2020 10:38

misuzu marked this pull request as ready for review February 28, 2020 12:54

misuzu mentioned this pull request Mar 4, 2020

ebtables: restore legacy commands #81545

Merged

10 tasks

misuzu force-pushed the iptables-switch branch 2 times, most recently from c9888d1 to 81fbb2f Compare March 15, 2020 15:34

ofborg bot requested review from ehmry, wucke13, globin and fpletz March 15, 2020 15:42

misuzu force-pushed the iptables-switch branch from 81fbb2f to fee0c80 Compare April 2, 2020 12:01

Mic92 reviewed Apr 2, 2020

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misuzu force-pushed the iptables-switch branch from fee0c80 to 16a9a8e Compare April 2, 2020 13:50

misuzu force-pushed the iptables-switch branch from 16a9a8e to 3298d23 Compare April 28, 2020 08:37

Mic92 reviewed Apr 28, 2020

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misuzu force-pushed the iptables-switch branch from 3298d23 to 9658d20 Compare April 28, 2020 10:22

ofborg bot requested a review from Mic92 April 28, 2020 10:29

misuzu force-pushed the iptables-switch branch from 9658d20 to f71b9cc Compare April 28, 2020 10:33

ofborg bot requested a review from oxzi April 28, 2020 10:49

misuzu force-pushed the iptables-switch branch from 780424e to 1dfe580 Compare April 28, 2020 13:36

ofborg bot requested a review from Izorkin October 8, 2021 16:43

Izorkin approved these changes Oct 8, 2021

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docs/release-notes: mention iptables switch

f898fde

misuzu force-pushed the iptables-switch branch from a0b7829 to f898fde Compare October 10, 2021 08:43

ofborg bot requested a review from Izorkin October 10, 2021 08:56

Izorkin approved these changes Oct 10, 2021

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flokli merged commit b112f36 into NixOS:staging Oct 12, 2021

misuzu mentioned this pull request Nov 2, 2021

nixos/libvirtd: use /etc/ethertypes from iptables package #144201

Merged

12 tasks

misuzu added a commit to misuzu/nixpkgs that referenced this pull request Nov 2, 2021

nixos/libvirtd: use /etc/ethertypes from iptables package

ff22dd6

This change is part of NixOS#81172 and must have been lost during staging cycle.

mkg20001 added a commit to mkg20001/nixpkgs that referenced this pull request Nov 3, 2021

nixos/lxd: fix nftables switch NixOS#81172 breaking module

9d3df0b

mkg20001 mentioned this pull request Nov 3, 2021

nixos/lxd: fix nftables switch #81172 breaking module #144362

Merged

12 tasks

misuzu mentioned this pull request Nov 3, 2021

nixos/nftables: Allow use with iptables #121517

Merged

10 tasks

datafoo mentioned this pull request Jan 21, 2022

Cannot see iptables masquerade rule set by systemd since 21.11 #156041

Closed

grantbevis mentioned this pull request Feb 16, 2022

Everything that changed in my fork of this repo nix-community/NixOS-WSL#56

Merged

This was referenced Feb 22, 2022

nftables module: absorb into firewall module, rename ruleset options #161428

Open

[RFC] Modularize the firewall and nixify the rules #23181

Closed

Firewall improvements/suggestions/discussion #21974

Open

misuzu deleted the iptables-switch branch June 7, 2022 10:37

Thesola10 mentioned this pull request Nov 17, 2022

Firewall reload on NixOS upgrade kills networking #201614

Open

onny mentioned this pull request Aug 9, 2023

nixos/opensnitch: Add support for EPBF process monitor #229627

Merged

12 tasks

flokli mentioned this pull request Sep 6, 2023

nixos/networkmanager: default firewallBackend to nftables, remove firewallBackend #240918

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iptables: switch from iptables-legacy to iptables-nftables-compat #81172

iptables: switch from iptables-legacy to iptables-nftables-compat #81172

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iptables: switch from iptables-legacy to iptables-nftables-compat #81172

iptables: switch from iptables-legacy to iptables-nftables-compat #81172

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