/* $KAME: if_faith.c,v 1.23 2001/12/17 13:55:29 sumikawa 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.
* 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.
*
* $FreeBSD$
*/
/*
* 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 "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/sockio.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/malloc.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_clone.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#include <net/vnet.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
struct faith_softc {
struct ifnet *sc_ifp;
};
static int faithioctl(struct ifnet *, u_long, caddr_t);
static int faithoutput(struct ifnet *, struct mbuf *, const struct sockaddr *,
struct route *);
static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
#ifdef INET6
static int faithprefix(struct in6_addr *);
#endif
static int faithmodevent(module_t, int, void *);
static const char faithname[] = "faith";
static MALLOC_DEFINE(M_FAITH, faithname, "Firewall Assisted Tunnel Interface");
static int faith_clone_create(struct if_clone *, int, caddr_t);
static void faith_clone_destroy(struct ifnet *);
static struct if_clone *faith_cloner;
#define FAITHMTU 1500
static int
faithmodevent(mod, type, data)
module_t mod;
int type;
void *data;
{
switch (type) {
case MOD_LOAD:
faith_cloner = if_clone_simple(faithname, faith_clone_create,
faith_clone_destroy, 0);
#ifdef INET6
faithprefix_p = faithprefix;
#endif
break;
case MOD_UNLOAD:
#ifdef INET6
faithprefix_p = NULL;
#endif
if_clone_detach(faith_cloner);
break;
default:
return EOPNOTSUPP;
}
return 0;
}
static moduledata_t faith_mod = {
"if_faith",
faithmodevent,
0
};
DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(if_faith, 1);
static int
faith_clone_create(ifc, unit, params)
struct if_clone *ifc;
int unit;
caddr_t params;
{
struct ifnet *ifp;
struct faith_softc *sc;
sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
ifp = sc->sc_ifp = if_alloc(IFT_FAITH);
if (ifp == NULL) {
free(sc, M_FAITH);
return (ENOSPC);
}
ifp->if_softc = sc;
if_initname(sc->sc_ifp, faithname, 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_hdrlen = 0;
ifp->if_addrlen = 0;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
if_attach(ifp);
bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
return (0);
}
static void
faith_clone_destroy(ifp)
struct ifnet *ifp;
{
struct faith_softc *sc = ifp->if_softc;
bpfdetach(ifp);
if_detach(ifp);
if_free(ifp);
free(sc, M_FAITH);
}
static int
faithoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
struct route *ro)
{
int isr;
u_int32_t af;
struct rtentry *rt = NULL;
M_ASSERTPKTHDR(m);
if (ro != NULL)
rt = ro->ro_rt;
/* BPF writes need to be handled specially. */
if (dst->sa_family == AF_UNSPEC)
bcopy(dst->sa_data, &af, sizeof(af));
else
af = dst->sa_family;
if (bpf_peers_present(ifp->if_bpf))
bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
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);
}
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
switch (af) {
#ifdef INET
case AF_INET:
isr = NETISR_IP;
break;
#endif
#ifdef INET6
case AF_INET6:
isr = NETISR_IPV6;
break;
#endif
default:
m_freem(m);
return EAFNOSUPPORT;
}
/* XXX do we need more sanity checks? */
m->m_pkthdr.rcvif = ifp;
if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
netisr_dispatch(isr, m);
return (0);
}
/* ARGSUSED */
static void
faithrtrequest(cmd, rt, info)
int cmd;
struct rtentry *rt;
struct rt_addrinfo *info;
{
RT_LOCK_ASSERT(rt);
rt->rt_mtu = rt->rt_ifp->if_mtu;
}
/*
* 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;
ifp->if_drv_flags |= IFF_DRV_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:
ifp->if_mtu = ifr->ifr_mtu;
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
*/
static int
faithprefix(in6)
struct in6_addr *in6;
{
struct rtentry *rt;
struct sockaddr_in6 sin6;
int ret;
if (V_ip6_keepfaith == 0)
return 0;
bzero(&sin6, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_addr = *in6;
rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, 0UL, RT_DEFAULT_FIB);
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_LOCKED(rt);
return ret;
}
#endif
