NetBSD-5.0.2/sys/net/if_faith.c
/* $NetBSD: if_faith.c,v 1.44 2008/10/24 17:07:33 dyoung Exp $ */
/* $KAME: if_faith.c,v 1.21 2001/02/20 07:59:26 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. 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
*/
/*
* IPv6-to-IPv4 TCP relay capturing interface
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_faith.c,v 1.44 2008/10/24 17:07:33 dyoung Exp $");
#include "opt_inet.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <sys/cpu.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#include <net/if_faith.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#endif
#include "bpfilter.h"
#include <net/net_osdep.h>
static int faithioctl(struct ifnet *, u_long, void *);
static int faithoutput(struct ifnet *, struct mbuf *,
const struct sockaddr *, struct rtentry *);
static void faithrtrequest(int, struct rtentry *,
const struct rt_addrinfo *);
void faithattach(int);
static int faith_clone_create(struct if_clone *, int);
static int faith_clone_destroy(struct ifnet *);
static struct if_clone faith_cloner =
IF_CLONE_INITIALIZER("faith", faith_clone_create, faith_clone_destroy);
#define FAITHMTU 1500
/* ARGSUSED */
void
faithattach(int count)
{
if_clone_attach(&faith_cloner);
}
static int
faith_clone_create(struct if_clone *ifc, int unit)
{
struct ifnet *ifp;
ifp = if_alloc(IFT_FAITH);
if_initname(ifp, ifc->ifc_name, unit);
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;
ifp->if_dlt = DLT_NULL;
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(ifp, DLT_NULL, sizeof(u_int));
#endif
return (0);
}
int
faith_clone_destroy(struct ifnet *ifp)
{
#if NBPFILTER > 0
bpfdetach(ifp);
#endif
if_detach(ifp);
free(ifp, M_DEVBUF);
return (0);
}
static int
faithoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
struct rtentry *rt)
{
int s, isr;
uint32_t af;
struct ifqueue *ifq = 0;
if ((m->m_flags & M_PKTHDR) == 0)
panic("faithoutput no HDR");
af = dst->sa_family;
#if NBPFILTER > 0
/* BPF write needs to be handled specially */
if (af == AF_UNSPEC) {
af = *(mtod(m, int *));
m_adj(m, sizeof(int));
}
if (ifp->if_bpf)
bpf_mtap_af(ifp->if_bpf, af, m);
#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 (af) {
#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 = splnet();
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(int cmd, struct rtentry *rt,
const 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(struct ifnet *ifp, u_long cmd, void *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;
#ifdef SIOCSIFMTU
case SIOCSIFMTU:
if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET)
error = 0;
break;
#endif
case SIOCSIFFLAGS:
break;
default:
error = EINVAL;
}
return (error);
}
#ifdef INET6
/*
* XXX could be slow
* XXX could be layer violation to call sys/net from sys/netinet6
*/
int
faithprefix(struct in6_addr *in6)
{
struct rtentry *rt;
struct sockaddr_in6 sin6;
int ret;
if (ip6_keepfaith == 0)
return 0;
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_addr = *in6;
rt = rtalloc1((struct sockaddr *)&sin6, 0);
if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
(rt->rt_ifp->if_flags & IFF_UP) != 0)
ret = 1;
else
ret = 0;
if (rt)
RTFREE(rt);
return ret;
}
#endif