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|
{ lib, nets }:
let
makeTable = args:
{
chains = { };
flowtables = { };
sets = { };
maps = { };
objects = { };
} // args;
makeFlowtable = args:
{
hook = "ingress";
priority = "filter";
devices = [ ];
offload = false;
} // args;
makeBaseChain = type: hook:
{ priority ? type, policy ? "drop", rules ? "" }: {
base = { inherit type hook priority policy; };
inherit rules;
};
rulesCommon = {
conntrack = ''
ct state vmap { established : accept \
, related : accept \
, invalid : drop }
'';
# https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol#Operation
dhcp = ''
ip protocol udp \
udp sport 68 \
udp dport 67 \
accept comment dhcp
'';
# https://en.wikipedia.org/wiki/Domain_Name_System#Transport_protocols
dns = ''
ip protocol { tcp, udp } \
th sport 53 \
th dport 53 \
accept comment dns
'';
igmp = ''
ip protocol igmp accept comment "igmp"
'';
# https://userbase.kde.org/KDEConnect#I_have_two_devices_running_KDE_Connect_on_the_same_network,_but_they_can't_see_each_other
kdeconnect = ''
ip protocol { tcp, udp } \
th dport 1714-1764 \
accept comment kdeconnect
'';
ping = ''
icmp type echo-request limit rate 5/second accept
'';
# https://www.packetmischief.ca/2021/08/04/operating-sonos-speakers-in-a-multi-vlan-network/
ssdp = ''
ip protocol udp \
ip daddr { 239.255.255.250, 255.255.255.255 } \
udp dport 1900 \
accept comment ssdp
'';
ssh = ''
ip protocol tcp \
tcp dport 22 \
accept comment ssh
'';
# https://support.sonos.com/en-us/article/configure-your-firewall-to-work-with-sonos
# https://en.community.sonos.com/advanced-setups-229000/changed-udp-tcp-ports-for-sonos-app-needed-after-update-to-s2-6842454
sonos-app = ''
ip protocol tcp \
tcp dport { 1400, 1443, 3400, 3401, 3500, 4444 } \
accept comment "sonos: app control"
ip protocol udp \
udp dport { 1901, 6969, 32412, 32414 } \
accept comment "sonos: app control"
'';
# # https://docs.syncthing.net/users/firewall.html
syncthing = ''
ip protocol tcp \
tcp sport 22000 \
tcp dport 22000 \
accept comment syncthing
ip protocol udp \
udp dport 21027 \
accept comment "syncthing: discovery broadcast"
'';
};
in {
ip = {
filter = makeTable {
flowtables = {
default = makeFlowtable {
devices = lib.mapAttrsToList (_: { device, ... }: device) nets;
};
};
chains = {
wan_in.rules = with rulesCommon; dns + dhcp + ssh;
iot_in.rules = with rulesCommon; dns + dhcp + igmp;
lan_in.rules = rulesCommon.igmp;
input = makeBaseChain "filter" "input" {
rules = with rulesCommon;
conntrack + ping + ''
meta iifname vmap { lo : accept \
, ${nets.lan.interface} : goto lan_in \
, ${nets.wan.interface} : goto wan_in \
, ${nets.iot.interface} : goto iot_in }
'';
};
lan_wan.rules = with rulesCommon; sonos-app;
forward = makeBaseChain "filter" "forward" {
rules = with rulesCommon;
''
ip protocol { udp, tcp } flow add @default
'' + conntrack + ''
meta oifname ${nets.lan.interface} accept
meta iifname ${nets.lan.interface} \
meta oifname ${nets.wan.interface} \
goto lan_wan
'';
};
};
};
nat = makeTable {
chains = {
postrouting = makeBaseChain "nat" "postrouting" {
priority = "srcnat";
policy = "accept";
rules = ''
meta oifname ${nets.lan.interface} \
snat to ${nets.lan.machines.self.address}
'';
};
};
};
};
ip6 = {
global6 = makeTable {
chains = {
input = makeBaseChain "filter" "input" { };
forward = makeBaseChain "filter" "forward" { };
};
};
};
bridge = {
filter = makeTable {
chains = {
iot_wan.rules = rulesCommon.sonos-app;
wan_iot.rules = with rulesCommon; igmp + ssdp + sonos-app + ''
ip protocol udp udp sport 5353 udp dport 5353 accept comment mdns
log level debug prefix waniot
'';
wan_wan.rules = with rulesCommon; syncthing + kdeconnect;
forward = makeBaseChain "filter" "forward" {
rules = with rulesCommon;
conntrack + ''
ether type vmap { ip6 : drop, arp : accept }
'' + ping + ''
meta ibrname . meta obrname vmap \
{ ${nets.wan.interface} . ${nets.wan.interface} : goto wan_wan \
, ${nets.wan.interface} . ${nets.iot.interface} : goto wan_iot \
, ${nets.iot.interface} . ${nets.iot.interface} : goto wan_iot }
'';
};
};
};
};
}
# chain sonos {
# ip protocol tcp \
# tcp sport 4444 \
# tcp dport 4444 \
# accept comment "sonos: system updates"
# ip protocol udp \
# udp sport 6969 \
# udp dport 6969 \
# accept comment "sonos: setup"
# ip protocol udp \
# udp sport { 32413, 32414 } \
# udp dport { 32412, 32414 } \
# accept comment "sonos"
# }
# chain steam {
# # https://help.steampowered.com/en/faqs/view/2EA8-4D75-DA21-31EB
# ip protocol { udp, tcp } \
# th dport 27015-27050 \
# accept comment "steam: login, download"
# ip protocol udp \
# udp dport 27000-27100 \
# accept comment "steam: client: game traffic"
# ip protocol . th sport \
# { udp . 27031-27036, tcp . 27036 } \
# accept comment "steam: client: remote play"
# ip protocol udp \
# udp dport 4380 \
# accept comment "steam: client"
# ip protocol tcp \
# tcp sport 27015 \
# accept comment "steam: servers: SRCDS Rcon port"
# ip protocol udp \
# udp sport 27015 \
# accept comment "steam: servers: gameplay traffic"
# ip protocol udp \
# udp dport { 3478, 4379, 4380, 27014-27030 } \
# accept comment "steam: p2p, voice chat"
# }
|
