usr/src/sys/net/if_loop.c

/*	if_loop.c	4.11	82/04/16	*/

/*
 * 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 "../net/in.h"
#include "../net/in_systm.h"
#include "../net/if.h"
#include "../net/ip.h"
#include "../net/ip_var.h"
#include "../h/mtpr.h"
#include "../net/route.h"
#include <errno.h>

#define	LONET	127
#define	LOMTU	(1024+512)

struct	ifnet loif;
int	looutput();

loattach()
{
	register struct ifnet *ifp = &loif;
	register struct sockaddr_in *sin;

COUNT(LOATTACH);
	ifp->if_name = "lo";
	ifp->if_mtu = LOMTU;
	ifp->if_net = LONET;
	sin = (struct sockaddr_in *)&ifp->if_addr;
	sin->sin_family = AF_INET;
	sin->sin_addr = if_makeaddr(ifp->if_net, 0);
	ifp->if_flags = IFF_UP;
	ifp->if_output = looutput;
	if_attach(ifp);
	if_rtinit(ifp, RTF_DIRECT|RTF_UP);
}

looutput(ifp, m0, dst)
	struct ifnet *ifp;
	struct mbuf *m0;
	struct sockaddr *dst;
{
	int s = splimp();
	register struct ifqueue *ifq;

COUNT(LOOUTPUT);
	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);
}
Commit	Line	Data
	1	/* if_loop.c 4.11 82/04/16 */
	2
	3	/*
	4	* Loopback interface driver for protocol testing and timing.
	5	*/
	6
	7	#include "../h/param.h"
	8	#include "../h/systm.h"
	9	#include "../h/mbuf.h"
	10	#include "../h/socket.h"
	11	#include "../net/in.h"
	12	#include "../net/in_systm.h"
	13	#include "../net/if.h"
	14	#include "../net/ip.h"
	15	#include "../net/ip_var.h"
	16	#include "../h/mtpr.h"
	17	#include "../net/route.h"
	18	#include <errno.h>
	19
	20	#define LONET 127
	21	#define LOMTU (1024+512)
	22
	23	struct ifnet loif;
	24	int looutput();
	25
	26	loattach()
	27	{
	28	register struct ifnet *ifp = &loif;
	29	register struct sockaddr_in *sin;
	30
	31	COUNT(LOATTACH);
	32	ifp->if_name = "lo";
	33	ifp->if_mtu = LOMTU;
	34	ifp->if_net = LONET;
	35	sin = (struct sockaddr_in *)&ifp->if_addr;
	36	sin->sin_family = AF_INET;
	37	sin->sin_addr = if_makeaddr(ifp->if_net, 0);
	38	ifp->if_flags = IFF_UP;
	39	ifp->if_output = looutput;
	40	if_attach(ifp);
	41	if_rtinit(ifp, RTF_DIRECT\|RTF_UP);
	42	}
	43
	44	looutput(ifp, m0, dst)
	45	struct ifnet *ifp;
	46	struct mbuf *m0;
	47	struct sockaddr *dst;
	48	{
	49	int s = splimp();
	50	register struct ifqueue *ifq;
	51
	52	COUNT(LOOUTPUT);
	53	ifp->if_opackets++;
	54	switch (dst->sa_family) {
	55
	56	#ifdef INET
	57	case AF_INET:
	58	ifq = &ipintrq;
	59	if (IF_QFULL(ifq)) {
	60	IF_DROP(ifq);
	61	m_freem(m0);
	62	splx(s);
	63	return (ENOBUFS);
	64	}
	65	IF_ENQUEUE(ifq, m0);
	66	schednetisr(NETISR_IP);
	67	break;
	68	#endif
	69	default:
	70	splx(s);
	71	printf("lo%d: can't handle af%d\n", ifp->if_unit,
	72	dst->sa_family);
	73	m_freem(m0);
	74	return (EAFNOSUPPORT);
	75	}
	76	ifp->if_ipackets++;
	77	splx(s);
	78	return (0);
	79	}