Feat: support IPv6 routing for Wireguard

internal/wireguard/ipv6.go

@@ -0,0 +1,33 @@
+package wireguard
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/qdm12/gluetun/internal/netlink"
+)
+
+var (
+	errLinkList  = errors.New("cannot list links")
+	errRouteList = errors.New("cannot list routes")
+)
+
+func (w *Wireguard) isIPv6Supported() (supported bool, err error) {
+	links, err := w.netlink.LinkList()
+	if err != nil {
+		return false, fmt.Errorf("%w: %s", errLinkList, err)
+	}
+
+	for _, link := range links {
+		routes, err := w.netlink.RouteList(link, netlink.FAMILY_V6)
+		if err != nil {
+			return false, fmt.Errorf("%w: %s", errRouteList, err)
+		}
+
+		if len(routes) > 0 {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}