* Copyright (c) 1982, 1986 Regents of the University of California.
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
* @(#)if_loop.c 7.4 (Berkeley) 6/27/88
* Loopback interface driver for protocol testing and timing.
#include "../net/netisr.h"
#include "../net/route.h"
#include "../machine/mtpr.h"
#include "../netinet/in.h"
#include "../netinet/in_systm.h"
#include "../netinet/in_var.h"
#include "../netinet/ip.h"
#include "../netns/ns_if.h"
int looutput(), loioctl();
register struct ifnet
*ifp
= &loif
;
ifp
->if_flags
= IFF_LOOPBACK
;
ifp
->if_output
= looutput
;
register struct mbuf
*m0
;
register struct ifqueue
*ifq
;
* Place interface pointer before the data
* for the receiving protocol.
if (m0
->m_off
<= MMAXOFF
&&
m0
->m_off
>= MMINOFF
+ sizeof(struct ifnet
*)) {
m0
->m_off
-= sizeof(struct ifnet
*);
m0
->m_len
+= sizeof(struct ifnet
*);
MGET(m
, M_DONTWAIT
, MT_HEADER
);
if (m
== (struct mbuf
*)0)
m
->m_len
= sizeof(struct ifnet
*);
*(mtod(m0
, struct ifnet
**)) = ifp
;
switch (dst
->sa_family
) {
printf("lo%d: can't handle af%d\n", ifp
->if_unit
,
* Process an ioctl request.
register struct ifnet
*ifp
;
* Everything else is done at a higher level.