--- Net2/net/if_loop.c	2018/04/24 18:13:15	1.1.1.2
+++ Net2/net/if_loop.c	2018/04/24 18:21:40	1.1.1.3
@@ -30,7 +30,8 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)if_loop.c	7.13 (Berkeley) 4/26/91
+ *	from: @(#)if_loop.c	7.13 (Berkeley) 4/26/91
+ *	if_loop.c,v 1.6 1993/06/27 06:02:27 andrew Exp
  */
 
 /*
@@ -45,6 +46,8 @@
 #include "ioctl.h"
 #include "protosw.h"
 
+#include "loop.h"
+
 #include "../net/if.h"
 #include "../net/if_types.h"
 #include "../net/netisr.h"
@@ -78,25 +81,32 @@ static caddr_t lo_bpf;
 
 #define	LOMTU	(1024+512)
 
-struct	ifnet loif;
+struct	ifnet loif[NLOOP];
 int	looutput(), loioctl();
 
+void
 loattach()
 {
-	register struct ifnet *ifp = &loif;
+	register int i;
+	register struct ifnet *ifp;
 
-	ifp->if_name = "lo";
-	ifp->if_mtu = LOMTU;
-	ifp->if_flags = IFF_LOOPBACK;
-	ifp->if_ioctl = loioctl;
-	ifp->if_output = looutput;
-	ifp->if_type = IFT_LOOP;
-	ifp->if_hdrlen = 0;
-	ifp->if_addrlen = 0;
-	if_attach(ifp);
+	for (i = 0; i < NLOOP; i++)
+	{
+		ifp = &loif[i];
+		ifp->if_unit = i;
+		ifp->if_name = "lo";
+		ifp->if_mtu = LOMTU;
+		ifp->if_flags = IFF_LOOPBACK;
+		ifp->if_ioctl = loioctl;
+		ifp->if_output = looutput;
+		ifp->if_type = IFT_LOOP;
+		ifp->if_hdrlen = 0;
+		ifp->if_addrlen = 0;
+		if_attach(ifp);
 #if NBPFILTER > 0
-	bpfattach(&lo_bpf, ifp, DLT_NULL, sizeof(u_int));
+		bpfattach(&lo_bpf, ifp, DLT_NULL, sizeof(u_int));
 #endif
+	}
 }
 
 looutput(ifp, m, dst, rt)