From 5e9ae9fa1f329d51ddc2d0eeef38407cbec3409b Mon Sep 17 00:00:00 2001
From: Quentin McGaw <quentin.mcgaw@gmail.com>
Date: Thu, 30 Oct 2025 17:14:45 +0100
Subject: [PATCH] fix(wireguard): specify IP family for new route (#2629)

---
 internal/wireguard/route.go      | 5 +++++
 internal/wireguard/route_test.go | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/internal/wireguard/route.go b/internal/wireguard/route.go
index 84178d03..9893dc76 100644
--- a/internal/wireguard/route.go
+++ b/internal/wireguard/route.go
@@ -32,9 +32,14 @@ func (w *Wireguard) addRoutes(link netlink.Link, destinations []netip.Prefix,
 func (w *Wireguard) addRoute(link netlink.Link, dst netip.Prefix,
 	firewallMark uint32,
 ) (err error) {
+	family := netlink.FamilyV4
+	if dst.Addr().Is6() {
+		family = netlink.FamilyV6
+	}
 	route := netlink.Route{
 		LinkIndex: link.Index,
 		Dst:       dst,
+		Family:    family,
 		Table:     int(firewallMark),
 	}
 
diff --git a/internal/wireguard/route_test.go b/internal/wireguard/route_test.go
index 57e48afa..ce05ac60 100644
--- a/internal/wireguard/route_test.go
+++ b/internal/wireguard/route_test.go
@@ -37,6 +37,7 @@ func Test_Wireguard_addRoute(t *testing.T) {
 			expectedRoute: netlink.Route{
 				LinkIndex: linkIndex,
 				Dst:       ipPrefix,
+				Family:    netlink.FamilyV4,
 				Table:     firewallMark,
 			},
 		},
@@ -49,6 +50,7 @@ func Test_Wireguard_addRoute(t *testing.T) {
 			expectedRoute: netlink.Route{
 				LinkIndex: linkIndex,
 				Dst:       ipPrefix,
+				Family:    netlink.FamilyV4,
 				Table:     firewallMark,
 			},
 			routeAddErr: errDummy,