net/netns: don't bind to device for localhost connections
Fixes derphttp test failures on Windows (for
import (
"encoding/binary"
+ "strings"
"syscall"
"unsafe"
@@ -28,6 +29,13 @@ func interfaceIndex(iface *winipcfg.IPAdapterAddresses) uint32 {
// control binds c to the Windows interface that holds a default
// route, and is not the Tailscale WinTun interface.
func control(network, address string, c syscall.RawConn) error {
+ if strings.HasPrefix(address, "127.") {
+ // Don't bind to an interface for localhost connections,
+ // otherwise we get:
+ // connectex: The requested address is not valid in its context
+ // (The derphttp tests were failing)
+ return nil
+ }
canV4, canV6 := false, false
switch network {
case "tcp", "udp":
