From 8690c489ff0a3469a001132803bd5f3ea6da68e3 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sat, 23 Oct 2021 15:35:21 +0200
Subject: yggdrasil-wg: ...

---
 accounts/gkleen@sif/zshrc        | 17 +++++++++++++++++
 modules/yggdrasil-wg/default.nix | 18 +++++++++++-------
 2 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/accounts/gkleen@sif/zshrc b/accounts/gkleen@sif/zshrc
index 9fe88163..bcdc662a 100644
--- a/accounts/gkleen@sif/zshrc
+++ b/accounts/gkleen@sif/zshrc
@@ -399,6 +399,23 @@ ssh-installer() {
   ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -o IdentityFile=~/.ssh/gkleen@sif.midgard.yggdrasil $@
 }
 
+dichotomic_search() {
+  min=$1; shift
+  max=$1; shift
+
+  while [[ $min -lt $max ]]; do
+    # Compute the mean between min and max, rounded up to the superior unit
+    current=$(( (min + max + 1 ) / 2 ))
+    if $@ $current; then
+      min=$current
+    else
+      max=$((current - 1))
+    fi
+  done
+
+  echo $min
+}
+
 alias '..'='cd ..'
 alias -g L='| less'
 alias -g S='&> /dev/null'
diff --git a/modules/yggdrasil-wg/default.nix b/modules/yggdrasil-wg/default.nix
index 316371ea..48672fcb 100644
--- a/modules/yggdrasil-wg/default.nix
+++ b/modules/yggdrasil-wg/default.nix
@@ -37,9 +37,14 @@ let
     sif = "${wgSubnet}:2::/${toString wgHostLength}";
   };
   greHostMACPrefixes = {
-    surtr = "02:00:00:00:00";
-    vidhar = "02:00:00:00:01";
-    sif = "02:00:00:00:02";
+    surtr = "02:00:01:00:00";
+    vidhar = "02:00:01:00:01";
+    sif = "02:00:01:00:02";
+  };
+  batHostMACs = {
+    surtr = "02:00:00:00:00:00";
+    vidhar = "02:00:00:01:00:00";
+    sif = "02:00:00:02:00:00";
   };
   batHostIPs = {
     surtr = ["${batSubnet}::/${toString batHostLength}"];
@@ -70,12 +75,10 @@ let
       netdevConfig = {
         Name = "yggre-${other}";
         Kind = "ip6gretap";
-        MTUBytes = toString (1280 + 58);
       };
       tunnelConfig = {
         Local = stripSubnet wgHostIPs.${hostName};
         Remote = stripSubnet wgHostIPs.${other};
-        DiscoverPathMTU = false;
       };
     };
   linkToGreNetwork = ix: opts@{from, to, ...}:
@@ -123,7 +126,6 @@ in {
           netdevConfig = {
             Name = "yggdrasil-wg";
             Kind = "wireguard";
-            MTUBytes = toString (1280 + 58 + 70);
           };
           wireguardConfig = {
             PrivateKeyFile = config.sops.secrets."yggdrasil-wg.priv".path;
@@ -135,7 +137,9 @@ in {
           netdevConfig = {
             Name = "yggdrasil";
             Kind = "batadv";
-            MTUBytes = toString 1280;
+          };
+          linkConfig = {
+            MACAddress = "${batHostMACs.${hostName}}";
           };
         };
       } // listToAttrs (map linkToGreDev hostLinks);
-- 
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