93 lines
2.7 KiB
Nix
93 lines
2.7 KiB
Nix
{
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config,
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lib,
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...
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}:
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{
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imports = [ ];
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options.me = {
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firewall.enable = lib.mkOption {
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type = lib.types.bool;
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default = false;
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example = true;
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description = "Whether we want to install firewall.";
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};
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};
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config = lib.mkIf config.me.firewall.enable {
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# kernel modules and settings required by Kubernetes
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boot.kernelModules = [
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"overlay"
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"br_netfilter"
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];
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boot.kernel.sysctl = {
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"net.bridge.bridge-nf-call-iptables" = 1;
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"net.bridge.bridge-nf-call-ip6tables" = 1;
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"net.ipv4.ip_forward" = 1;
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# Enable forwarding on all interfaces.
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# "net.ipv4.conf.all.forwarding" = 1;
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# "net.ipv6.conf.all.forwarding" = 1;
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};
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networking.firewall.enable = true;
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networking.nftables.enable = true;
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# We want to filter forwarded traffic.
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# Also needed for `networking.firewall.extraForwardRules` to do anything.
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networking.firewall.filterForward = true;
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# Allow traffic from the pods on the lxc interfaces even though the interfaces do not have the correct ip addressses set for the return path.
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networking.firewall.extraReversePathFilterRules = ''
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iifname "lxc*" ip6 saddr 2620:11f:7001:7:ffff:eeee::/96 accept
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iifname "lxc*" ip saddr 10.200.0.0/16 accept
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'';
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networking.firewall.extraInputRules = builtins.concatStringsSep "\n" [
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# Allow pod-to-node communication
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''
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ip6 saddr 2620:11f:7001:7:ffff:eeee::/96 accept
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''
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];
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# networking.firewall.extraInputRules = ''
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# ip6 saddr 2620:11f:7001:7:ffff:eeee::/96 accept
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# ip6 saddr fd00:3e42:e349::/112 accept
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# ip6 saddr 2620:11f:7001:7:ffff:ffff:0ad7:0100/120 accept
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# '';
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networking.firewall.extraForwardRules = builtins.concatStringsSep "\n" [
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# Allow pod to external communication
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''
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iifname "lxc*" ip6 saddr 2620:11f:7001:7:ffff:eeee::/96 accept
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iifname "lxc*" ip saddr 10.200.0.0/16 accept
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''
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# Allow pod-to-pod communication
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''
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ip saddr 10.200.0.0/16 ip daddr 10.200.0.0/16 accept
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ip6 saddr 2620:11f:7001:7:ffff:eeee::/96 ip6 daddr 2620:11f:7001:7:ffff:eeee::/96 accept
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''
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# Allow external-to-pod communication
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''
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ip daddr 10.200.0.0/16 accept
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ip6 daddr 2620:11f:7001:7:ffff:eeee::/96 accept
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''
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];
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# networking.firewall.extraForwardRules = ''
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# ip6 daddr 2620:11f:7001:7:ffff:eeee::/96 accept
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# ip6 daddr fd00:3e42:e349::/112 accept
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# ip6 daddr 2620:11f:7001:7:ffff:ffff:0ad7:0100/120 accept
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# '';
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# Check logs for blocked connections:
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# journalctl -k or dmesg
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# networking.nftables.tables."my-fw" = {
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# family = "inet";
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# content = (builtins.readFile ./files/my-fw.nft);
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# };
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};
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}
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