From 5089214a3dfaf8dc5b0ec3875ce676a231c30f29 Mon Sep 17 00:00:00 2001
From: Matt Layher <mdlayher@gmail.com>
Date: Tue, 7 Jan 2020 11:52:32 -0500
Subject: [PATCH] nixos/corerad: init

---
 nixos/modules/module-list.nix                 |  1 +
 nixos/modules/services/networking/corerad.nix | 46 ++++++++++++
 nixos/tests/all-tests.nix                     |  1 +
 nixos/tests/corerad.nix                       | 71 +++++++++++++++++++
 4 files changed, 119 insertions(+)
 create mode 100644 nixos/modules/services/networking/corerad.nix
 create mode 100644 nixos/tests/corerad.nix

diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 0a078fb4c79..b6d6f199392 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -578,6 +578,7 @@
   ./services/networking/connman.nix
   ./services/networking/consul.nix
   ./services/networking/coredns.nix
+  ./services/networking/corerad.nix
   ./services/networking/coturn.nix
   ./services/networking/dante.nix
   ./services/networking/ddclient.nix
diff --git a/nixos/modules/services/networking/corerad.nix b/nixos/modules/services/networking/corerad.nix
new file mode 100644
index 00000000000..1a2c4aec665
--- /dev/null
+++ b/nixos/modules/services/networking/corerad.nix
@@ -0,0 +1,46 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.corerad;
+in {
+  meta = {
+    maintainers = with maintainers; [ mdlayher ];
+  };
+
+  options.services.corerad = {
+    enable = mkEnableOption "CoreRAD IPv6 NDP RA daemon";
+
+    configFile = mkOption {
+      type = types.path;
+      example = literalExample "\"\${pkgs.corerad}/etc/corerad/corerad.toml\"";
+      description = "Path to CoreRAD TOML configuration file.";
+    };
+
+    package = mkOption {
+      default = pkgs.corerad;
+      defaultText = literalExample "pkgs.corerad";
+      type = types.package;
+      description = "CoreRAD package to use.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services.corerad = {
+      description = "CoreRAD IPv6 NDP RA daemon";
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        LimitNPROC = 512;
+        LimitNOFILE = 1048576;
+        CapabilityBoundingSet = "CAP_NET_ADMIN CAP_NET_RAW";
+        AmbientCapabilities = "CAP_NET_ADMIN CAP_NET_RAW";
+        NoNewPrivileges = true;
+        DynamicUser = true;
+        ExecStart = "${getBin cfg.package}/bin/corerad -c=${cfg.configFile}";
+        Restart = "on-failure";
+      };
+    };
+  };
+}
diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
index 67dfd931d4b..ceeab2c21d9 100644
--- a/nixos/tests/all-tests.nix
+++ b/nixos/tests/all-tests.nix
@@ -61,6 +61,7 @@ in
   containers-portforward = handleTest ./containers-portforward.nix {};
   containers-restart_networking = handleTest ./containers-restart_networking.nix {};
   containers-tmpfs = handleTest ./containers-tmpfs.nix {};
+  corerad = handleTest ./corerad.nix {};
   couchdb = handleTest ./couchdb.nix {};
   deluge = handleTest ./deluge.nix {};
   dhparams = handleTest ./dhparams.nix {};
diff --git a/nixos/tests/corerad.nix b/nixos/tests/corerad.nix
new file mode 100644
index 00000000000..68b698857b4
--- /dev/null
+++ b/nixos/tests/corerad.nix
@@ -0,0 +1,71 @@
+import ./make-test-python.nix (
+  {
+    nodes = {
+      router = {config, pkgs, ...}: { 
+        config = {
+          # This machines simulates a router with IPv6 forwarding and a static IPv6 address.
+          boot.kernel.sysctl = {
+            "net.ipv6.conf.all.forwarding" = true;
+          };
+          networking.interfaces.eth1 = {
+            ipv6.addresses = [ { address = "fd00:dead:beef:dead::1"; prefixLength = 64; } ];
+          };
+          services.corerad = {
+            enable = true;
+            # Serve router advertisements to the client machine with prefix information matching
+            # any IPv6 /64 prefixes configured on this interface.
+            configFile = pkgs.writeText "corerad.toml" ''
+              [[interfaces]]
+              name = "eth1"
+              send_advertisements = true
+                [[interfaces.plugins]]
+                name = "prefix"
+                prefix = "::/64"
+            '';
+          };
+        };
+      };
+      client = {config, pkgs, ...}: {
+        # Use IPv6 SLAAC from router advertisements, and install rdisc6 so we can
+        # trigger one immediately.
+        config = {
+          boot.kernel.sysctl = {
+            "net.ipv6.conf.all.autoconf" = true;
+          };
+          environment.systemPackages = with pkgs; [
+            ndisc6
+          ];
+        };
+      };
+    };
+
+    testScript = ''
+      start_all()
+
+      with subtest("Wait for CoreRAD and network ready"):
+          # Ensure networking is online and CoreRAD is ready.
+          router.wait_for_unit("network-online.target")
+          client.wait_for_unit("network-online.target")
+          router.wait_for_unit("corerad.service")
+
+          # Ensure the client can reach the router.
+          client.wait_until_succeeds("ping -c 1 fd00:dead:beef:dead::1")
+
+      with subtest("Verify SLAAC on client"):
+          # Trigger a router solicitation and verify a SLAAC address is assigned from
+          # the prefix configured on the router.
+          client.wait_until_succeeds("rdisc6 -1 -r 10 eth1")
+          client.wait_until_succeeds(
+              "ip -6 addr show dev eth1 | grep -q 'fd00:dead:beef:dead:'"
+          )
+
+          addrs = client.succeed("ip -6 addr show dev eth1")
+
+          assert (
+              "fd00:dead:beef:dead:" in addrs
+          ), "SLAAC prefix was not found in client addresses after router advertisement"
+          assert (
+              "/64 scope global temporary" in addrs
+          ), "SLAAC temporary address was not configured on client after router advertisement"
+    '';
+  })