From ed0d0fa3c8f4a146717df2289869e529e7c10ebb Mon Sep 17 00:00:00 2001
From: Luke Granger-Brown <hg@lukegb.com>
Date: Thu, 4 Apr 2024 22:51:40 +0000
Subject: [PATCH] nixos/bgp: add internal exports

---
 ops/nixos/lib/bgp.nix | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/ops/nixos/lib/bgp.nix b/ops/nixos/lib/bgp.nix
index d4653b1813..123fb55f60 100644
--- a/ops/nixos/lib/bgp.nix
+++ b/ops/nixos/lib/bgp.nix
@@ -266,6 +266,29 @@ in {
               };
             };
           };
+          internal.export = mkOption {
+            default = { v4 = []; v6 = []; };
+            type = submodule {
+              options = {
+                v4 = mkOption { # lukegbgp.config.internal.export.v4
+                  type = listOf str;
+                  default = [];
+                };
+                v4Extra = mkOption { #lukegbgp.config.internal.export.v4Extra
+                  type = lines;
+                  default = "";
+                };
+                v6 = mkOption { # lukegbgp.config.internal.export.v6
+                  type = listOf str;
+                  default = [];
+                };
+                v6Extra = mkOption { #lukegbgp.config.internal.export.v6Extra
+                  type = lines;
+                  default = "";
+                };
+              };
+            };
+          };
           bfd = mkOption { # lukegbgp.config.bfd
             type = lines;
             default = "";
@@ -380,6 +403,16 @@ in {
           ${lib.concatMapStrings (ip: "route ${ip} blackhole;") config.services.lukegbgp.config.export.v4}
           ${config.services.lukegbgp.config.export.v4Extra}
         };
+        protocol static exportinternal4 {
+          ipv4 {
+            import filter {
+              bgp_ext_community.add((ro, 205479, 10));  # internal only
+              accept;
+            };
+          };
+          ${lib.concatMapStrings (ip: "route ${ip} blackhole;") config.services.lukegbgp.config.internal.export.v4}
+          ${config.services.lukegbgp.config.internal.export.v4Extra}
+        };
         protocol static export6 {
           ipv6 {
             import filter {
@@ -414,6 +447,16 @@ in {
           ${lib.concatMapStrings (ip: "route ${ip} blackhole;") config.services.lukegbgp.config.export.v6}
           ${config.services.lukegbgp.config.export.v6Extra}
         };
+        protocol static exportinternal6 {
+          ipv6 {
+            import filter {
+              bgp_ext_community.add((ro, 205479, 10));  # internal only
+              accept;
+            };
+          };
+          ${lib.concatMapStrings (ip: "route ${ip} blackhole;") config.services.lukegbgp.config.internal.export.v6}
+          ${config.services.lukegbgp.config.internal.export.v6Extra}
+        };
 
         protocol bfd {
           ${config.services.lukegbgp.config.bfd}