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/* $OpenBSD: if_faith.c,v 1.14 2003/05/03 21:15:11 deraadt 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 "faith.h"
#if NFAITH > 0
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/ioctl.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_var.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#endif
#include "bpfilter.h"
static int faithioctl(struct ifnet *, u_long, caddr_t);
int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
void faithattach(int);
static struct ifnet faithif[NFAITH];
#define FAITHMTU 1500
/* ARGSUSED */
void
faithattach(faith)
int faith;
{
struct ifnet *ifp;
int i;
for (i = 0; i < NFAITH; i++) {
ifp = &faithif[i];
bzero(ifp, sizeof(faithif[i]));
snprintf(ifp->if_xname, sizeof ifp->if_xname, "faith%d", i);
ifp->if_mtu = FAITHMTU;
/* Change to BROADCAST experimentaly to announce its prefix. */
ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
ifp->if_ioctl = faithioctl;
ifp->if_output = faithoutput;
ifp->if_type = IFT_FAITH;
ifp->if_hdrlen = 0;
ifp->if_addrlen = 0;
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
#endif
}
}
int
faithoutput(ifp, m, dst, rt)
struct ifnet *ifp;
struct mbuf *m;
struct sockaddr *dst;
struct rtentry *rt;
{
int s, isr;
struct ifqueue *ifq = 0;
if ((m->m_flags & M_PKTHDR) == 0)
panic("faithoutput 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 faith 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 *)⁡
bpf_mtap(ifp->if_bpf, &m0);
}
#endif
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:
ifq = &ipintrq;
isr = NETISR_IP;
break;
#endif
#ifdef INET6
case AF_INET6:
ifq = &ip6intrq;
isr = NETISR_IPV6;
break;
#endif
default:
m_freem(m);
return EAFNOSUPPORT;
}
/* XXX do we need more sanity checks? */
m->m_pkthdr.rcvif = ifp;
s = splimp();
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);
return (0);
}
/* ARGSUSED */
static void
faithrtrequest(cmd, rt, info)
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
faithioctl(ifp, cmd, data)
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 = faithrtrequest;
/*
* 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;
case SIOCSIFFLAGS:
break;
default:
error = EINVAL;
}
return (error);
}
#endif /* NFAITH > 0 */
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