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/* $KAME: if_dummy.c,v 1.31 2007/08/02 10:39:14 itojun Exp $ */
/*
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* derived from
* @(#)if_loop.c 8.1 (Berkeley) 6/10/93
* Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
*/
/*
* Loopback interface driver for protocol testing and timing.
*/
#include "dummy.h"
#if NDUMMY > 0
#ifdef __FreeBSD__
#include "opt_inet.h"
#include "opt_inet6.h"
#endif
#ifdef __NetBSD__
#include "opt_inet.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/errno.h>
#ifdef __FreeBSD__
#include <sys/sockio.h>
#else
#include <sys/ioctl.h>
#endif
#include <sys/time.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif
#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#endif
#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif
#ifdef ISO
#include <netiso/iso.h>
#include <netiso/iso_var.h>
#endif
#ifdef NETATALK
#include <netatalk/at.h>
#include <netatalk/at_var.h>
#endif
#ifdef __FreeBSD__
#include "bpf.h"
#define NBPFILTER NBPF
#else
#include "bpfilter.h"
#endif
#include <net/net_osdep.h>
static int dummyioctl(struct ifnet *, u_long, caddr_t);
int dummyoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
static void dummyrtrequest(int, struct rtentry *, struct rt_addrinfo *);
#ifdef __FreeBSD__
void dummyattach(void *);
PSEUDO_SET(dummyattach, if_dummy);
#else
void dummyattach(int);
#endif
#ifdef TINY_DUMMYMTU
#define DUMMYMTU (1024+512)
#else
#define DUMMYMTU 16384
#endif
static struct ifnet dummyif[NDUMMY];
/* ARGSUSED */
void
#ifdef __FreeBSD__
dummyattach(void *dummy)
#else
dummyattach(int dummy)
#endif
{
struct ifnet *ifp;
int i;
for (i = 0; i < NDUMMY; i++) {
ifp = &dummyif[i];
#ifdef __FreeBSD__
if_initname(ifp, "dummy", i);
#else
sprintf(ifp->if_xname, "dummy%d", i);
#endif
ifp->if_softc = NULL;
ifp->if_mtu = DUMMYMTU;
/* Change to BROADCAST experimentaly to announce its prefix. */
ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
ifp->if_ioctl = dummyioctl;
ifp->if_output = dummyoutput;
ifp->if_type = IFT_DUMMY;
#ifdef __FreeBSD__
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
#endif
ifp->if_hdrlen = 0;
ifp->if_addrlen = 0;
#ifdef __NetBSD__
ifp->if_dlt = DLT_NULL;
#endif
if_attach(ifp);
#if defined(__NetBSD__) || defined(__OpenBSD__)
if_alloc_sadl(ifp);
#endif
#if NBPFILTER > 0
#ifdef HAVE_NEW_BPFATTACH
bpfattach(ifp, DLT_NULL, sizeof(u_int));
#else
bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
#endif
#endif
}
}
int
dummyoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
struct rtentry *rt)
{
#ifndef __FreeBSD__
int s;
struct ifqueue *ifq = 0;
#endif
int isr;
if ((m->m_flags & M_PKTHDR) == 0)
panic("dummyoutput no HDR");
#if NBPFILTER > 0
/* BPF write needs to be handled specially */
if (dst->sa_family == AF_UNSPEC) {
dst->sa_family = *mtod(m, int *);
m->m_len -= sizeof(int);
m->m_pkthdr.len -= sizeof(int);
m->m_data += sizeof(int);
}
if (ifp->if_bpf) {
/*
* We need to prepend the address family as
* a four byte field. Cons up a dummy header
* to pacify bpf. This is safe because bpf
* will only read from the mbuf (i.e., it won't
* try to free it or keep a pointer a to it).
*/
struct mbuf m0;
u_int32_t af = dst->sa_family;
m0.m_flags = 0;
m0.m_next = m;
m0.m_len = 4;
m0.m_data = (char *)&af;
#ifdef HAVE_NEW_BPF
bpf_mtap(ifp, &m0);
#else
bpf_mtap(ifp->if_bpf, &m0);
#endif
}
#endif
m->m_pkthdr.rcvif = ifp;
if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
m_freem(m);
return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
}
ifp->if_opackets++;
ifp->if_obytes += m->m_pkthdr.len;
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
#ifndef __FreeBSD__
ifq = &ipintrq;
#endif
isr = NETISR_IP;
break;
#endif
#ifdef IPX
case AF_IPX:
#ifndef __FreeBSD__
ifq = &ipxintrq;
#endif
isr = NETISR_IPX;
break;
#endif
#ifdef INET6
case AF_INET6:
#ifndef __FreeBSD__
ifq = &ip6intrq;
#endif
isr = NETISR_IPV6;
break;
#endif
#ifdef NS
case AF_NS:
#ifndef __FreeBSD__
ifq = &nsintrq;
#endif
isr = NETISR_NS;
break;
#endif
#ifdef ISO
case AF_ISO:
#ifndef __FreeBSD__
ifq = &clnlintrq;
#endif
isr = NETISR_ISO;
break;
#endif
#ifdef NETATALK
case AF_APPLETALK:
#ifndef __FreeBSD__
ifq = &atintrq2;
#endif
isr = NETISR_ATALK;
break;
#endif
default:
printf("%s: can't handle af%d\n",
if_name(ifp), dst->sa_family);
m_freem(m);
return (EAFNOSUPPORT);
}
#ifdef __FreeBSD__
ifp->if_ipackets++;
ifp->if_ibytes += m->m_pkthdr.len;
netisr_queue(isr, m);
#else
#ifdef __NetBSD__
s = splnet();
#else
s = splimp();
#endif
if (IF_QFULL(ifq)) {
IF_DROP(ifq);
m_freem(m);
splx(s);
return (ENOBUFS);
}
IF_ENQUEUE(ifq, m);
schednetisr(isr);
ifp->if_ipackets++;
ifp->if_ibytes += m->m_pkthdr.len;
splx(s);
#endif /* !FreeBSD5 */
return (0);
}
/* ARGSUSED */
static void
dummyrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
{
if (rt) {
rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
}
}
/*
* Process an ioctl request.
*/
/* ARGSUSED */
static int
dummyioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ifaddr *ifa;
struct ifreq *ifr = (struct ifreq *)data;
int error = 0;
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP | IFF_RUNNING;
ifa = (struct ifaddr *)data;
ifa->ifa_rtrequest = dummyrtrequest;
/*
* Everything else is done at a higher level.
*/
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
if (ifr == 0) {
error = EAFNOSUPPORT; /* XXX */
break;
}
switch (ifr->ifr_addr.sa_family) {
#ifdef INET
case AF_INET:
break;
#endif
#ifdef INET6
case AF_INET6:
break;
#endif
default:
error = EAFNOSUPPORT;
break;
}
break;
#ifdef SIOCSIFMTU
case SIOCSIFMTU:
ifp->if_mtu = ifr->ifr_mtu;
break;
#endif
case SIOCSIFFLAGS:
break;
default:
error = EINVAL;
}
return (error);
}
#endif /* NDUMMY > 0 */
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