From: CSRG <csrg@ucbvax.Berkeley.EDU>
Date: Sun, 27 Mar 1983 02:57:45 +0000 (-0800)
Subject: BSD 4_1c_2 development
X-Git-Tag: BSD-4_1c_2~29
X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/commitdiff_plain/cb4ea8b2072afb82ddc0e865919e1b15e8884de2

BSD 4_1c_2 development
Work on file a/sys/netinet/in.c

Synthesized-from: CSRG/cd1/4.1c.2
---

diff --git a/a/sys/netinet/in.c b/a/sys/netinet/in.c
new file mode 100644
index 0000000000..e947bc7b3e
--- /dev/null
+++ b/a/sys/netinet/in.c
@@ -0,0 +1,101 @@
+/*	in.c	4.12	83/03/14	*/
+
+#include "../h/param.h"
+#include "../h/mbuf.h"
+#include "../h/protosw.h"
+#include "../h/socket.h"
+#include "../h/socketvar.h"
+#include "../netinet/in.h"
+#include "../netinet/in_systm.h"
+#include "../net/if.h"
+#include "../net/route.h"
+#include "../net/af.h"
+
+#ifdef INET
+inet_hash(sin, hp)
+	register struct sockaddr_in *sin;
+	struct afhash *hp;
+{
+
+	hp->afh_nethash = in_netof(sin->sin_addr);
+	hp->afh_hosthash = ntohl(sin->sin_addr.s_addr);
+}
+
+inet_netmatch(sin1, sin2)
+	struct sockaddr_in *sin1, *sin2;
+{
+
+	return (in_netof(sin1->sin_addr) == in_netof(sin2->sin_addr));
+}
+
+/*
+ * Formulate an Internet address from network + host.  Used in
+ * building addresses stored in the ifnet structure.
+ */
+struct in_addr
+if_makeaddr(net, host)
+	int net, host;
+{
+	u_long addr;
+
+	if (net < 128)
+		addr = (net << IN_CLASSA_NSHIFT) | host;
+	else if (net < 65536)
+		addr = (net << IN_CLASSB_NSHIFT) | host;
+	else
+		addr = (net << IN_CLASSC_NSHIFT) | host;
+	addr = htonl(addr);
+	return (*(struct in_addr *)&addr);
+}
+
+/*
+ * Return the network number from an internet address.
+ */
+in_netof(in)
+	struct in_addr in;
+{
+	register u_long i = ntohl(in.s_addr);
+
+	if (IN_CLASSA(i))
+		return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
+	else if (IN_CLASSB(i))
+		return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
+	else
+		return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
+}
+
+/*
+ * Return the host portion of an internet address.
+ */
+in_lnaof(in)
+	struct in_addr in;
+{
+	register u_long i = ntohl(in.s_addr);
+
+	if (IN_CLASSA(i))
+		return ((i)&IN_CLASSA_HOST);
+	else if (IN_CLASSB(i))
+		return ((i)&IN_CLASSB_HOST);
+	else
+		return ((i)&IN_CLASSC_HOST);
+}
+
+/*
+ * Initialize an interface's routing
+ * table entry according to the network.
+ * INTERNET SPECIFIC.
+ */
+if_rtinit(ifp, flags)
+	register struct ifnet *ifp;
+	int flags;
+{
+	struct sockaddr_in sin;
+
+	if (ifp->if_flags & IFF_ROUTE)
+		return;
+	bzero((caddr_t)&sin, sizeof (sin));
+	sin.sin_family = AF_INET;
+	sin.sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY);
+	rtinit((struct sockaddr *)&sin, &ifp->if_addr, flags);
+}
+#endif