From 27a554f1ab79fda61d1661cdcb1b207e57c315d1 Mon Sep 17 00:00:00 2001
From: wollman <wollman@FreeBSD.org>
Date: Tue, 25 Apr 1995 19:50:20 +0000
Subject: Disallow half-configured point-to-point interfaces.  It's still
 possible to get into a half-configured state by using the old-style
 ioctls;this may be a feature.

---
 sys/netinet/in.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

(limited to 'sys/netinet/in.c')

diff --git a/sys/netinet/in.c b/sys/netinet/in.c
index 1da3f58..c90cc2c 100644
--- a/sys/netinet/in.c
+++ b/sys/netinet/in.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)in.c	8.2 (Berkeley) 11/15/93
- * $Id: in.c,v 1.10 1995/03/16 18:14:50 bde Exp $
+ * $Id: in.c,v 1.11 1995/03/23 18:14:40 wollman Exp $
  */
 
 #include <sys/param.h>
@@ -202,12 +202,19 @@ in_control(so, cmd, data, ifp)
 
 	case SIOCAIFADDR:
 	case SIOCDIFADDR:
-		if (ifra->ifra_addr.sin_family == AF_INET)
-		    for (oia = ia; ia; ia = ia->ia_next) {
-			if (ia->ia_ifp == ifp  &&
-			    ia->ia_addr.sin_addr.s_addr ==
-				ifra->ifra_addr.sin_addr.s_addr)
-			    break;
+		if (ifra->ifra_addr.sin_family == AF_INET) {
+			for (oia = ia; ia; ia = ia->ia_next) {
+				if (ia->ia_ifp == ifp  &&
+				    ia->ia_addr.sin_addr.s_addr ==
+				    ifra->ifra_addr.sin_addr.s_addr)
+					break;
+			}
+			if ((ifp->if_flags & IFF_POINTOPOINT) 
+			    && (cmd == SIOCAIFADDR)
+			    && (ifra->ifra_dstaddr.sin_addr.s_addr
+				== INADDR_ANY)) {
+				return EADDRNOTAVAIL;
+			}
 		}
 		if (cmd == SIOCDIFADDR && ia == 0)
 			return (EADDRNOTAVAIL);
-- 
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