From: Sam Leffler <sam@ucbvax.Berkeley.EDU>
Date: Wed, 3 Nov 1982 14:28:02 +0000 (-0800)
Subject: date and time created 82/11/02 22:28:02 by sam
X-Git-Tag: BSD-4_1c_2-Snapshot-Development~1951
X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/commitdiff_plain/7ab5124abc72f6c936644d9b7de938ceaa656cc4

date and time created 82/11/02 22:28:02 by sam

SCCS-vsn: sbin/routed/if.c 4.1
---

diff --git a/usr/src/sbin/routed/if.c b/usr/src/sbin/routed/if.c
new file mode 100644
index 0000000000..7baa3dc2f7
--- /dev/null
+++ b/usr/src/sbin/routed/if.c
@@ -0,0 +1,94 @@
+#ifndef lint
+static char sccsid[] = "@(#)if.c	4.1 %G%";
+#endif
+
+/*
+ * Routing Table Management Daemon
+ */
+#include "router.h"
+
+extern	struct interface *ifnet;
+
+/*
+ * Find the interface with address add.
+ */
+struct interface *
+if_ifwithaddr(addr)
+	struct sockaddr *addr;
+{
+	register struct interface *ifp;
+
+#define	same(a1, a2) \
+	(bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0)
+	for (ifp = ifnet; ifp; ifp = ifp->int_next) {
+		if (ifp->int_flags & IFF_REMOTE)
+			continue;
+		if (ifp->int_addr.sa_family != addr->sa_family)
+			continue;
+		if (same(&ifp->int_addr, addr))
+			break;
+		if ((ifp->int_flags & IFF_BROADCAST) &&
+		    same(&ifp->int_broadaddr, addr))
+			break;
+	}
+	return (ifp);
+}
+
+/*
+ * Find the interface on the network 
+ * of the specified address.
+ */
+struct interface *
+if_ifwithnet(addr)
+	register struct sockaddr *addr;
+{
+	register struct interface *ifp;
+	register int af = addr->sa_family;
+	register int (*netmatch)();
+
+	if (af >= AF_MAX)
+		return (0);
+	netmatch = afswitch[af].af_netmatch;
+	for (ifp = ifnet; ifp; ifp = ifp->int_next) {
+		if (ifp->int_flags & IFF_REMOTE)
+			continue;
+		if (af != ifp->int_addr.sa_family)
+			continue;
+		if ((*netmatch)(addr, &ifp->int_addr))
+			break;
+	}
+	return (ifp);
+}
+
+/*
+ * Find an interface from which the specified address
+ * should have come from.  Used for figuring out which
+ * interface a packet came in on -- for tracing.
+ */
+struct interface *
+if_iflookup(addr)
+	struct sockaddr *addr;
+{
+	register struct interface *ifp, *maybe;
+	register int af = addr->sa_family;
+	register int (*netmatch)();
+
+	if (af >= AF_MAX)
+		return (0);
+	maybe = 0;
+	netmatch = afswitch[af].af_netmatch;
+	for (ifp = ifnet; ifp; ifp = ifp->int_next) {
+		if (ifp->int_addr.sa_family != af)
+			continue;
+		if (same(&ifp->int_addr, addr))
+			break;
+		if ((ifp->int_flags & IFF_BROADCAST) &&
+		    same(&ifp->int_broadaddr, addr))
+			break;
+		if (maybe == 0 && (*netmatch)(addr, &ifp->int_addr))
+			maybe = ifp;
+	}
+	if (ifp == 0)
+		ifp = maybe;
+	return (ifp);
+}