From cb7811898c29a7ecfde66da2d42aeb4d8e572010 Mon Sep 17 00:00:00 2001
From: Luke Granger-Brown <hg@lukegb.com>
Date: Fri, 10 Sep 2021 20:46:05 +0000
Subject: [PATCH] blade-tuvok: set bgp_local_prefs

---
 ops/nixos/lib/bgp.nix          |  6 ++++++
 ops/nixos/lib/blade-router.nix | 10 +++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/ops/nixos/lib/bgp.nix b/ops/nixos/lib/bgp.nix
index b41085f8e0..d96625cd36 100644
--- a/ops/nixos/lib/bgp.nix
+++ b/ops/nixos/lib/bgp.nix
@@ -14,6 +14,7 @@ let
     {
       if ! (avoid_martians4()) then reject;
       ${if ix.remote.must_be_next_hop then "if (bgp_path.first != ${toString ix.remote.asn}) then reject;" else "# no next-hop requirement"}
+      bgp_local_pref = ${toString ix.remote.bgp_local_pref};
       accept;
     }
     filter bgp_in_${ixName}6
@@ -22,6 +23,7 @@ let
     {
       if ! (avoid_martians6()) then reject;
       ${if ix.remote.must_be_next_hop then "if (bgp_path.first != ${toString ix.remote.asn}) then reject;" else "# no next-hop requirement"}
+      bgp_local_pref = ${toString ix.remote.bgp_local_pref};
       accept;
     }
     protocol pipe ${ixName}pipe_4 {
@@ -139,6 +141,10 @@ in {
                         type = bool;
                         default = true;
                       };
+                      bgp_local_pref = mkOption { # lukegbgp.config.peering.<foo>.remote.bgp_local_pref
+                        type = int;
+                        default = 100;
+                      };
                       routers = mkOption { # lukegbgp.config.peering.<foo>.remote.routers
                         type = listOf (submodule {
                           options = {
diff --git a/ops/nixos/lib/blade-router.nix b/ops/nixos/lib/blade-router.nix
index 8e4f139c14..dd5575e329 100644
--- a/ops/nixos/lib/blade-router.nix
+++ b/ops/nixos/lib/blade-router.nix
@@ -138,6 +138,7 @@ in
           remote = {
             asn = 3170;
             export_community = 4001;
+            bgp_local_pref = 101;
             routers = [{
               v4 = config.my.blade-router.addresses.linknet.v4.remote;
               v6 = config.my.blade-router.addresses.linknet.v6.remote;
@@ -170,6 +171,7 @@ in
               v4 = "195.66.225.231";
               v6 = "2001:7f8:4::220a:2";
             }];
+            bgp_local_pref = 109;
             must_be_next_hop = false;
           };
         };
@@ -209,6 +211,7 @@ in
               v4 = "195.66.225.53";
               v6 = "2001:7f8:4::5052:1";
             }];
+            bgp_local_pref = 110;
             prefix_limit.v4 = 16000;
             prefix_limit.v6 = 3000;
           };
@@ -217,7 +220,8 @@ in
           remote = {
             asn = 212895;
             export_community = 5004;
-            passive = true;  # pending
+            passive = true;  # pending v6
+            bgp_local_pref = 100;
             routers = [{
               enabled = cfg.linx.enable;
               v4 = "195.66.225.105";
@@ -234,6 +238,7 @@ in
               v4 = "195.66.224.21";
               v6 = "2001:7f8:4::1b1b:1";
             }];
+            bgp_local_pref = 110;
             prefix_limit.v4 = 176000;
             prefix_limit.v6 = 156000;
           };
@@ -248,6 +253,7 @@ in
               v4 = "195.66.227.14";
               v6 = "2001:7f8:4::f320:1";
             }];
+            bgp_local_pref = 120;
             prefix_limit.v4 = 1000;
             prefix_limit.v6 = 1000;
           };
@@ -261,6 +267,7 @@ in
               v4 = "195.66.224.125";
               v6 = "2001:7f8:4::3b41:1";
             }];
+            bgp_local_pref = 120;
             prefix_limit.v4 = 15000;
             prefix_limit.v6 = 10000;
           };
@@ -274,6 +281,7 @@ in
               v4 = "195.66.225.179";
               v6 = "2001:7f8:4::3417:1";
             }];
+            bgp_local_pref = 120;
             prefix_limit.v4 = 20000;
             prefix_limit.v6 = 2000;
           };