internal/netlink: make full response available

The previous API makes it impossible to retrieve remaining messages in the current iteration.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/netlink/rtnl.go

@@ -18,23 +18,23 @@ func DialRoute() (*RouteConn, error) {
 }
 
 // rtnlConsume consumes a message from rtnetlink.
-func rtnlConsume(msg *syscall.NetlinkMessage) error {
-	switch msg.Header.Type {
-	case syscall.NLMSG_DONE:
-		return Complete{}
+func rtnlConsume(resp []syscall.NetlinkMessage) error {
+	for i := range resp {
+		switch resp[i].Header.Type {
+		case syscall.NLMSG_DONE:
+			return Complete{}
 
-	case syscall.NLMSG_ERROR:
-		if e := As[syscall.NlMsgerr](msg.Data); e != nil {
-			if e.Error == 0 {
-				return Complete{}
+		case syscall.NLMSG_ERROR:
+			if e := As[syscall.NlMsgerr](resp[i].Data); e != nil {
+				if e.Error == 0 {
+					return Complete{}
+				}
+				return syscall.Errno(-e.Error)
 			}
-			return syscall.Errno(-e.Error)
+			return syscall.EBADE
 		}
-		return syscall.EBADE
-
-	default:
-		return nil
 	}
+	return nil
 }
 
 // InAddr is equivalent to struct in_addr.