From: CSRG <csrg@ucbvax.Berkeley.EDU>
Date: Fri, 29 Jul 1983 00:14:45 +0000 (-0800)
Subject: BSD 4_2 development
X-Git-Tag: BSD-4_3^2~275
X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/commitdiff_plain/0f9fe565388413e28df489c768352279a8ec4e75

BSD 4_2 development
Work on file usr/src/sys/netinet/if_loop.c

Synthesized-from: CSRG/cd1/4.2
---

diff --git a/usr/src/sys/netinet/if_loop.c b/usr/src/sys/netinet/if_loop.c
new file mode 100644
index 0000000000..2c46759f23
--- /dev/null
+++ b/usr/src/sys/netinet/if_loop.c
@@ -0,0 +1,118 @@
+/*	if_loop.c	6.1	83/07/29	*/
+
+/*
+ * Loopback interface driver for protocol testing and timing.
+ */
+
+#include "../h/param.h"
+#include "../h/systm.h"
+#include "../h/mbuf.h"
+#include "../h/socket.h"
+#include "../h/errno.h"
+#include "../h/ioctl.h"
+
+#include "../net/if.h"
+#include "../net/netisr.h"
+#include "../net/route.h"
+
+#include "../netinet/in.h"
+#include "../netinet/in_systm.h"
+#include "../netinet/ip.h"
+#include "../netinet/ip_var.h"
+
+#ifdef vax
+#include "../vax/mtpr.h"
+#endif
+
+#define	LONET	127
+#define	LOHOST	1			/* can't be 0, that's broadcast */
+#define	LOMTU	(1024+512)
+
+struct	ifnet loif;
+int	looutput(), loioctl();
+
+loattach()
+{
+	register struct ifnet *ifp = &loif;
+	register struct sockaddr_in *sin;
+
+	ifp->if_name = "lo";
+	ifp->if_mtu = LOMTU;
+	ifp->if_net = LONET;
+	ifp->if_host[0] = LOHOST;
+	sin = (struct sockaddr_in *)&ifp->if_addr;
+	sin->sin_family = AF_INET;
+	sin->sin_addr = if_makeaddr(LONET, LOHOST);
+	ifp->if_flags = IFF_UP | IFF_RUNNING;
+	ifp->if_ioctl = loioctl;
+	ifp->if_output = looutput;
+	if_attach(ifp);
+	if_rtinit(ifp, RTF_UP);
+}
+
+looutput(ifp, m0, dst)
+	struct ifnet *ifp;
+	struct mbuf *m0;
+	struct sockaddr *dst;
+{
+	int s = splimp();
+	register struct ifqueue *ifq;
+
+	ifp->if_opackets++;
+	switch (dst->sa_family) {
+
+#ifdef INET
+	case AF_INET:
+		ifq = &ipintrq;
+		if (IF_QFULL(ifq)) {
+			IF_DROP(ifq);
+			m_freem(m0);
+			splx(s);
+			return (ENOBUFS);
+		}
+		IF_ENQUEUE(ifq, m0);
+		schednetisr(NETISR_IP);
+		break;
+#endif
+	default:
+		splx(s);
+		printf("lo%d: can't handle af%d\n", ifp->if_unit,
+			dst->sa_family);
+		m_freem(m0);
+		return (EAFNOSUPPORT);
+	}
+	ifp->if_ipackets++;
+	splx(s);
+	return (0);
+}
+
+/*
+ * Process an ioctl request.
+ */
+loioctl(ifp, cmd, data)
+	register struct ifnet *ifp;
+	int cmd;
+	caddr_t data;
+{
+	struct ifreq *ifr = (struct ifreq *)data;
+	struct sockaddr_in *sin;
+	int s = splimp(), error = 0;
+
+	switch (cmd) {
+
+	case SIOCSIFADDR:
+		if (ifp->if_flags & IFF_RUNNING)
+			if_rtinit(ifp, -1);	/* delete previous route */
+		ifp->if_addr = ifr->ifr_addr;
+		sin = (struct sockaddr_in *)&ifp->if_addr;
+		ifp->if_net = in_netof(sin->sin_addr);
+		ifp->if_host[0] = in_lnaof(sin->sin_addr);
+		if_rtinit(ifp, RTF_UP);
+		break;
+
+	default:
+		error = EINVAL;
+	}
+	splx(s);
+	return (error);
+}