From 417a3d4aab027fe329d7793593ee0b91955c6718 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Wed, 29 Jun 1994 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1994-06-29

---
 pc/devether.c | 3 ++-
 port/netif.c  | 7 +++++++
 port/netif.h  | 3 ++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/pc/devether.c b/pc/devether.c
index 43f1421dd95b5f52c9f4f4519295a4201f845b4a..f7ac3e9bf45f7dff8200961cf7ba4f5c02fb4f30 100644
--- a/pc/devether.c
+++ b/pc/devether.c
@@ -114,7 +114,8 @@ etherwloop(Ether *ctlr, Etherpkt *pkt, long len)
 	int s, different;
 
 	different = memcmp(pkt->d, pkt->s, sizeof(pkt->s));
-	if(different && memcmp(pkt->d, ctlr->bcast, sizeof(pkt->d)))
+	if(different && memcmp(pkt->d, ctlr->bcast, sizeof(pkt->d))
+	&& ctlr->prom==0 && ctlr->all==0)
 		return 0;
 
 	s = splhi();
diff --git a/port/netif.c b/port/netif.c
index 45744dd2f824ddc32298231633aca19d6111806f..81b80e9d726833186552236622cc802fa51b2b85 100644
--- a/port/netif.c
+++ b/port/netif.c
@@ -213,6 +213,8 @@ netifwrite(Netif *nif, Chan *c, void *a, long n)
 	f = nif->f[NETID(c->qid.path)];
 	if(p = matchtoken(buf, "connect")){
 		f->type = atoi(p);
+		if(f->type < 0)
+			nif->all++;
 	} else if(matchtoken(buf, "promiscuous")){
 		f->prom = 1;
 		nif->prom++;
@@ -266,6 +268,11 @@ netifclose(Netif *nif, Chan *c)
 				(*nif->promiscuous)(nif->arg, 0);
 			qunlock(nif);
 		}
+		if(f->type < 0){
+			qlock(nif);
+			--(nif->all);
+			qunlock(nif);
+		}
 		f->owner[0] = 0;
 		f->type = 0;
 		qclose(f->in);
diff --git a/port/netif.h b/port/netif.h
index ad19214dee7d0e530232d4a9d11e821467f39bb6..bd6acd794107014c3e2d8bcea089a492e38ed26e 100644
--- a/port/netif.h
+++ b/port/netif.h
@@ -57,7 +57,8 @@ struct Netif
 	int	alen;			/* address length */
 	uchar	addr[Nmaxaddr];
 	uchar	bcast[Nmaxaddr];
-	int	prom;
+	int	prom;			/* number of promiscuous opens */
+	int	all;			/* number of -1 multiplexors */
 
 	/* statistics */
 	int	misses;