Introduce IFF_SMART bit.

This means that the driver will add/delete routes when it knows it is
up/down, rather than have the generic code belive it is up if configured.

This is probably most useful for serial lines, although many PHY chips
could probably tell us if we're connected to the cable/hub as well.

2 files changed, 10 insertions, 6 deletions

diff --git a/sys/net/if.c b/sys/net/if.c
index e91445e..3021562 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)if.c	8.3 (Berkeley) 1/4/94
- *	$Id: if.c,v 1.69 1999/04/27 11:16:56 phk Exp $
+ *	$Id: if.c,v 1.70 1999/04/28 11:37:32 phk Exp $
  */
 
 #include "opt_compat.h"
@@ -639,12 +639,15 @@ ifioctl(so, cmd, data, p)
 		if (error)
 			return (error);
 		ifr->ifr_prevflags = ifp->if_flags;
-		if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) {
+		if (ifp->if_flags & IFF_SMART) {
+			/* Smart drivers twiddle their own routes */
+		} else if ((ifp->if_flags & IFF_UP &&
+		    (ifr->ifr_flags & IFF_UP) == 0) {
 			int s = splimp();
 			if_down(ifp);
 			splx(s);
-		}
-		if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) {
+		} else if (ifr->ifr_flags & IFF_UP &&
+		    (ifp->if_flags & IFF_UP) == 0) {
 			int s = splimp();
 			if_up(ifp);
 			splx(s);
diff --git a/sys/net/if.h b/sys/net/if.h
index f0fa46c..a639bc2 100644
--- a/sys/net/if.h
+++ b/sys/net/if.h
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)if.h	8.1 (Berkeley) 6/10/93
- *	$Id: if.h,v 1.51 1999/04/28 11:37:33 phk Exp $
+ *	$Id: if.h,v 1.52 1999/05/08 07:00:04 phk Exp $
  */
 
 #ifndef _NET_IF_H_
@@ -82,6 +82,7 @@ struct if_data {
 #define	IFF_DEBUG	0x4		/* turn on debugging */
 #define	IFF_LOOPBACK	0x8		/* is a loopback net */
 #define	IFF_POINTOPOINT	0x10		/* interface is point-to-point link */
+#define	IFF_SMART	0x20		/* interface manages own routes */
 #define	IFF_RUNNING	0x40		/* resources allocated */
 #define	IFF_NOARP	0x80		/* no address resolution protocol */
 #define	IFF_PROMISC	0x100		/* receive all packets */
@@ -97,7 +98,7 @@ struct if_data {
 /* flags set internally only: */
 #define	IFF_CANTCHANGE \
 	(IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|\
-	    IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI)
+	    IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI|IFF_SMART)
 
 #define	IFQ_MAXLEN	50
 #define	IFNET_SLOWHZ	1		/* granularity is 1 second */