wildcard ifaces; finally, after HE said it's ok

4 files changed, 64 insertions, 30 deletions

diff --git a/share/man/man4/lo.4 b/share/man/man4/lo.4
index 0491936b493..f73e93a9439 100644
--- a/share/man/man4/lo.4
+++ b/share/man/man4/lo.4
@@ -1,3 +1,4 @@
+.\"	$OpenBSD: lo.4,v 1.4 1998/02/14 18:50:34 mickey Exp $
 .\"	$NetBSD: lo.4,v 1.3 1994/11/30 16:22:23 jtc Exp $
 .\"
 .\" Copyright (c) 1983, 1991, 1993
@@ -40,8 +41,7 @@
 .Nm lo
 .Nd software loopback network interface
 .Sh SYNOPSIS
-.Sy pseudo-device
-.Nm loop
+.Sy pseudo-device Nm loop Em <number>
 .Sh DESCRIPTION
 The
 .Nm loop
@@ -60,6 +60,14 @@ The loopback should
 .Em never
 be configured first unless no hardware
 interfaces exist.
+.Pp
+Configuring loopback interface for
+.Xr inet 4
+with
+.Em link1
+flag set you achieve a functionality such as equivalent to setting
+the whole set of addresses wich belongs to the sub/super-net of the
+address and netmask configured on the interface.
 .Sh DIAGNOSTICS
 .Bl -diag
 .It lo%d: can't handle af%d.
@@ -67,15 +75,25 @@ The interface was handed
 a message with addresses formatted in an unsuitable address
 family; the packet was dropped.
 .El
+.Sh EXAMPLES
+ifconfig lo1 inet 192.168.1.1 netmask 255.255.255.0 link1
+this would configure lo1 the way equivalent to:
+.Pp
+awk 'BEGIN {for(i=1;i<255;i++) \
+print "ifconfig lo1 inet 192.168.1."i" netmask 255.255.255.255"}'|sh
 .Sh SEE ALSO
 .Xr intro 4 ,
 .Xr inet 4 ,
-.Xr ns 4
+.Xr ns 4 ,
+.Xr ifconfig 8
 .Sh HISTORY
 The
 .Nm
 device appeared in
 .Bx 4.2 .
+.Pp
+The wildcard functionality first appeared in
+.Ox 2.2 .
 .Sh BUGS
 Previous versions of the system enabled the loopback interface
 automatically, using a nonstandard Internet address (127.1).
diff --git a/sys/netinet/in_pcb.c b/sys/netinet/in_pcb.c
index ce69820bb54..e0b35d2c4c6 100644
--- a/sys/netinet/in_pcb.c
+++ b/sys/netinet/in_pcb.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: in_pcb.c,v 1.22 1998/02/14 10:55:10 deraadt Exp $	*/
+/*	$OpenBSD: in_pcb.c,v 1.23 1998/02/14 18:50:35 mickey Exp $	*/
 /*	$NetBSD: in_pcb.c,v 1.25 1996/02/13 23:41:53 christos Exp $	*/
 
 /*
@@ -189,7 +189,7 @@ in_pcbbind(v, nam)
 				reuseport = SO_REUSEADDR|SO_REUSEPORT;
 		} else if (sin->sin_addr.s_addr != INADDR_ANY) {
 			sin->sin_port = 0;		/* yech... */
-			if (ifa_ifwithaddr(sintosa(sin)) == 0)
+			if (in_iawithaddr(sin->sin_addr, NULL) == 0)
 				return (EADDRNOTAVAIL);
 		}
 		if (lport) {
@@ -656,12 +656,10 @@ in_pcblookup(table, faddr, fport_arg, laddr, lport_arg, flags)
 			if (laddr.s_addr != INADDR_ANY)
 				wildcard++;
 		}
-		if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0)
-			continue;
-		if (wildcard < matchwild) {
+		if ((!wildcard || (flags & INPLOOKUP_WILDCARD)) &&
+		    wildcard < matchwild) {
 			match = inp;
-			matchwild = wildcard;
-			if (matchwild == 0)
+			if ((matchwild = wildcard) == 0)
 				break;
 		}
 	}
diff --git a/sys/netinet/ip_input.c b/sys/netinet/ip_input.c
index fc76ac7eb38..7b6991b2afe 100644
--- a/sys/netinet/ip_input.c
+++ b/sys/netinet/ip_input.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ip_input.c,v 1.29 1998/02/03 21:11:08 deraadt Exp $	*/
+/*	$OpenBSD: ip_input.c,v 1.30 1998/02/14 18:50:36 mickey Exp $	*/
 /*	$NetBSD: ip_input.c,v 1.30 1996/03/16 23:53:58 christos Exp $	*/
 
 /*
@@ -196,7 +196,6 @@ ipintr()
 	register struct ip *ip;
 	register struct mbuf *m;
 	register struct ipq *fp;
-	register struct in_ifaddr *ia;
 	struct ipqent *ipqe;
 	int hlen, mff, s;
 
@@ -306,23 +305,9 @@ next:
 	/*
 	 * Check our list of addresses, to see if the packet is for us.
 	 */
-	for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) {
-		if (ip->ip_dst.s_addr == ia->ia_addr.sin_addr.s_addr)
-			goto ours;
-		if (((ip_directedbcast == 0) || (ip_directedbcast &&
-		    ia->ia_ifp == m->m_pkthdr.rcvif)) &&
-		    (ia->ia_ifp->if_flags & IFF_BROADCAST)) {
-			if (ip->ip_dst.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
-			    ip->ip_dst.s_addr == ia->ia_netbroadcast.s_addr ||
-			    /*
-			     * Look for all-0's host part (old broadcast addr),
-			     * either for subnet or net.
-			     */
-			    ip->ip_dst.s_addr == ia->ia_subnet ||
-			    ip->ip_dst.s_addr == ia->ia_net)
-				goto ours;
-		}
-	}
+	if (in_iawithaddr(ip->ip_dst, m))
+		goto ours;
+
 	if (IN_MULTICAST(ip->ip_dst.s_addr)) {
 		struct in_multi *inm;
 #ifdef MROUTING
@@ -478,6 +463,37 @@ bad:
 	goto next;
 }
 
+struct in_ifaddr *
+in_iawithaddr(ina, m)
+	struct in_addr ina;
+	register struct mbuf *m;
+{
+	register struct in_ifaddr *ia;
+
+	for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) {
+		if ((ina.s_addr == ia->ia_addr.sin_addr.s_addr) ||
+		    ((ia->ia_ifp->if_flags & (IFF_LOOPBACK|IFF_LINK1)) ==
+			(IFF_LOOPBACK|IFF_LINK1) &&
+		     ia->ia_subnet == (ina.s_addr & ia->ia_subnetmask)))
+			return ia;
+		if (m && ((ip_directedbcast == 0) || (ip_directedbcast &&
+		    ia->ia_ifp == m->m_pkthdr.rcvif)) &&
+		    (ia->ia_ifp->if_flags & IFF_BROADCAST)) {
+			if (ina.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
+			    ina.s_addr == ia->ia_netbroadcast.s_addr ||
+			    /*
+			     * Look for all-0's host part (old broadcast addr),
+			     * either for subnet or net.
+			     */
+			    ina.s_addr == ia->ia_subnet ||
+			    ina.s_addr == ia->ia_net)
+				return ia;
+		}
+	}
+
+	return NULL;
+}
+
 /*
  * Take incoming datagram fragment and try to
  * reassemble it into whole datagram.  If a chain for
diff --git a/sys/netinet/ip_var.h b/sys/netinet/ip_var.h
index bb192317902..77afb80f922 100644
--- a/sys/netinet/ip_var.h
+++ b/sys/netinet/ip_var.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ip_var.h,v 1.7 1998/02/01 21:46:03 deraadt Exp $	*/
+/*	$OpenBSD: ip_var.h,v 1.8 1998/02/14 18:50:36 mickey Exp $	*/
 /*	$NetBSD: ip_var.h,v 1.16 1996/02/13 23:43:20 christos Exp $	*/
 
 /*
@@ -178,6 +178,8 @@ int	 ip_pcbopts __P((struct mbuf **, struct mbuf *));
 struct ip *
 	 ip_reass __P((struct ipqent *, struct ipq *));
 struct in_ifaddr *
+	 in_iawithaddr __P((struct in_addr, struct mbuf *));
+struct in_ifaddr *
 	 ip_rtaddr __P((struct in_addr));
 int	 ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *));
 void	 ip_slowtimo __P((void));