2 files changed, 5 insertions, 0 deletions

diff --git a/modules/networkd/default.nix b/modules/networkd/default.nix
index 007f14c6..f78a9aee 100644
--- a/modules/networkd/default.nix
+++ b/modules/networkd/default.nix
@@ -96,6 +96,7 @@ let
           "MACAddress"
         ])
         (assertHasField "Name")
+        (assertMaxLength "Name" 15)
         (assertHasField "Kind")
         (assertValueOneOf "Kind" [
           "bond"
diff --git a/modules/networkd/systemd-lib.nix b/modules/networkd/systemd-lib.nix
index 2dbf1503..c5b5b7cb 100644
--- a/modules/networkd/systemd-lib.nix
+++ b/modules/networkd/systemd-lib.nix
@@ -90,6 +90,10 @@ in rec {
     optional (attr ? ${name} && !isInt attr.${name})
       "Systemd ${group} field `${name}' is not an integer";
 
+  assertMaxLength = name: max: group: attr:
+    optional (attr ? ${name} && stringLength attr.${name} > max)
+      "Systemd ${group} field `${name}' is too long (max of ${max})";
+
   checkUnitConfig = group: checks: attrs: let
     # We're applied at the top-level type (attrsOf unitOption), so the actual
     # unit options might contain attributes from mkOverride and mkIf that we need to