Merge pull request #20 from libp2p/osx-ignore-error

ignore the error on the RouteMessage on Darwin

netroute_bsd.go

@@ -9,7 +9,7 @@
 
 // This is a BSD import for the routing structure initially found in
 // https://github.com/google/gopacket/blob/master/routing/routing.go
-//RIB parsing follows the BSD route format described in
+// RIB parsing follows the BSD route format described in
 // https://github.com/freebsd/freebsd/blob/master/sys/net/route.h
 package netroute
 
@@ -67,6 +67,8 @@ func New() (routing.Router, error) {
 	var ipn *net.IPNet
 	for _, msg := range msgs {
 		m := msg.(*route.RouteMessage)
+		// We ignore the error (m.Err) here. It's not clear what this error actually means,
+		// and it makes us miss routes that _should_ be included.
 		routeInfo := new(rtInfo)
 
 		if m.Version < 3 || m.Version > 5 {
@@ -80,9 +82,6 @@ func New() (routing.Router, error) {
 			m.Flags&(RTF_REJECT|RTF_BLACKHOLE) != 0 {
 			continue
 		}
-		if m.Err != nil {
-			continue
-		}
 
 		dst, err := toIPAddr(m.Addrs[0])
 		if err == nil {