From c42abfb1fe46d89d8c6bffc17aa69c778f17e2b4 Mon Sep 17 00:00:00 2001
From: des <des@FreeBSD.org>
Date: Wed, 24 Mar 1999 21:20:12 +0000
Subject: [PATCH] Implement TUNSIFMODE and TUNSLMODE.

Submitted by:	Alfred Perlstein <bright@cygnus.rush.net>
---
 sys/net/if_tun.c    | 43 ++++++++++++++++++++++++++++++++++++++++++-
 sys/net/if_tun.h    |  4 +++-
 sys/net/if_tunvar.h |  3 ++-
 3 files changed, 47 insertions(+), 3 deletions(-)

diff --git a/sys/net/if_tun.c b/sys/net/if_tun.c
index c395ee3ae1ac..e9725bc35dce 100644
--- a/sys/net/if_tun.c
+++ b/sys/net/if_tun.c
@@ -338,7 +338,24 @@ tunoutput(ifp, m0, dst, rt)
 
 		bpf_mtap(ifp, &m);
 	}
-#endif
+#endif /* NBPFILTER > 0 */
+
+	/* prepend sockaddr? this may abort if the mbuf allocation fails */
+	if (tp->tun_flags & TUN_LMODE) {
+		/* allocate space for sockaddr */
+		M_PREPEND(m0, dst->sa_len, M_DONTWAIT);
+
+		/* if allocation failed drop packet */
+		if (m0 == NULL){
+			s = splimp();	/* spl on queue manipulation */
+			IF_DROP(&ifp->if_snd);
+			splx(s);
+			ifp->if_oerrors++;
+			return (ENOBUFS);
+		} else {
+			bcopy(dst, m0->m_data, dst->sa_len);
+		}
+	}
 
 	switch(dst->sa_family) {
 #ifdef INET
@@ -406,6 +423,30 @@ tunioctl(dev, cmd, data, flag, p)
 	case TUNGDEBUG:
 		*(int *)data = tundebug;
 		break;
+	case TUNSLMODE:
+		if (*(int *)data)
+			tp->tun_flags |= TUN_LMODE;
+		else 
+			tp->tun_flags &= ~TUN_LMODE;
+		break;
+	case TUNSIFMODE:
+		/* deny this if UP */
+		if (tp->tun_if.if_flags & IFF_UP)
+			return(EBUSY);
+
+		switch (*(int *)data) {
+		case IFF_POINTOPOINT:
+			tp->tun_if.if_flags |= IFF_POINTOPOINT;
+			tp->tun_if.if_flags &= ~IFF_BROADCAST;
+			break;
+		case IFF_BROADCAST:
+			tp->tun_if.if_flags &= ~IFF_POINTOPOINT;
+			tp->tun_if.if_flags |= IFF_BROADCAST;
+			break;
+		default:
+			return(EINVAL);
+		}
+		break;
 	case FIONBIO:
 		break;
 	case FIOASYNC:
diff --git a/sys/net/if_tun.h b/sys/net/if_tun.h
index 31730858e052..1a1fa6461954 100644
--- a/sys/net/if_tun.h
+++ b/sys/net/if_tun.h
@@ -13,7 +13,7 @@
  * UCL. This driver is based much more on read/write/select mode of
  * operation though.
  *
- * $Id: if_tun.h,v 1.12 1998/01/26 19:52:34 brian Exp $
+ * $Id: if_tun.h,v 1.13 1998/04/17 22:36:56 des Exp $
  */
 
 #ifndef _NET_IF_TUN_H_
@@ -39,5 +39,7 @@ struct tuninfo {
 #define	TUNGDEBUG	_IOR('t', 89, int)
 #define	TUNSIFINFO	_IOW('t', 91, struct tuninfo)
 #define	TUNGIFINFO	_IOR('t', 92, struct tuninfo)
+#define	TUNSLMODE	_IOW('t', 93, int)
+#define	TUNSIFMODE	_IOW('t', 94, int)
 
 #endif /* !_NET_IF_TUN_H_ */
diff --git a/sys/net/if_tunvar.h b/sys/net/if_tunvar.h
index 9e537d3abef8..496c4fb7c97a 100644
--- a/sys/net/if_tunvar.h
+++ b/sys/net/if_tunvar.h
@@ -23,7 +23,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: if_tunvar.h,v 1.2 1998/11/11 10:04:10 truckman Exp $
+ *	$Id: if_tunvar.h,v 1.3 1998/11/11 10:56:05 truckman Exp $
  */
 
 #ifndef _NET_IF_TUNVAR_H_
@@ -36,6 +36,7 @@ struct tun_softc {
 #define	TUN_RCOLL	0x0004
 #define	TUN_IASET	0x0008
 #define	TUN_DSTADDR	0x0010
+#define	TUN_LMODE	0x0020
 #define	TUN_RWAIT	0x0040
 #define	TUN_ASYNC	0x0080