7 files changed, 41 insertions(+), 5 deletions(-)

M ip/devip.c
M ip/ethermedium.c
M ip/ip.h
M ip/ipifc.c
M ip/nullmedium.c
M ip/pktmedium.c
M pc/etherif.h

@@ 54,6 54,9 @@ QLock	fslock;
 Fs	*ipfs[Nfs];	/* attached fs's */
 Queue	*qlog;
 
+extern void nullmediumlink(void);
+extern void pktmediumlink(void);
+
 static int
 ip3gen(Chan *c, int i, Dir *dp)
 {


@@ 215,6 218,8 @@ ipgen(Chan *c, Dirtab*, int, int s, Dir *dp)
 static void
 ipreset(void)
 {
+	nullmediumlink();
+	pktmediumlink();
 }
 
 static void

@@ 515,3 515,9 @@ multicastarp(Fs *f, Arpent *a, uchar *mac)
 	/* let arp take care of it */
 	return nil;
 }
+
+void
+ethermediumlink(void)
+{
+	addipmedium(&ethermedium);
+}

@@ 446,6 446,7 @@ extern Medium	tripmedium;
  *  ipifc.c
  */
 extern Medium*	ipfindmedium(char *name);
+extern void	addipmedium(Medium *med);
 extern int	ipforme(Fs*, uchar *addr);
 extern int	ipismulticast(uchar *);
 extern Ipifc*	findipifc(Fs*, uchar *remote, int type);

@@ 17,12 17,8 @@ enum {
 	QMAX		= 64*1024-1,
 };
 
-Medium *media[] =
+Medium *media[32] =
 {
-	&ethermedium,
-	&pktmedium,
-	&nullmedium,
-	&tripmedium,
 	0
 };
 


@@ 72,6 68,21 @@ static char*	ipifcjoinmulti(Ipifc *ifc, char **argv, int argc);
 static char*	ipifcleavemulti(Ipifc *ifc, char **argv, int argc);
 
 /*
+ *  link in a new medium
+ */
+void
+addipmedium(Medium *med)
+{
+	int i;
+
+	for(i = 0; i < nelem(media)-1; i++)
+		if(media[i] == nil){
+			media[i] = med;
+			break;
+		}
+}
+
+/*
  *  find the medium with this name
  */
 Medium*

@@ 45,3 45,9 @@ Medium nullmedium =
 	nil,		/* leave multi */
 	0,		/* don't unbind on last close */
 };
+
+void
+nullmediumlink(void)
+{
+	addipmedium(&nullmedium);
+}

@@ 74,3 74,9 @@ pktin(Fs *f, Ipifc *ifc, Block *bp)
 	else
 		ipiput(f, ifc->lifc->local, bp);
 }
+
+void
+pktmediumlink(void)
+{
+	addipmedium(&pktmedium);
+}

@@ 6,6 6,7 @@ enum {
 typedef struct Ether Ether;
 struct Ether {
 	ISAConf;			/* hardware info */
+
 	int	ctlrno;
 	int	tbdf;			/* type+busno+devno+funcno */
 	int	mbps;			/* Mbps */