src/parsec/disk-image/parsec/parsec-benchmark/pkgs/libs/uptcpip/src/freebsd.netinet/if_loop.c - public/gem5-resources - Git at Google

 /*-
  * 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.
  *
  *	@(#)if_loop.c	8.2 (Berkeley) 1/9/95
  * $FreeBSD$
  */

 /*
  * Loopback interface driver for protocol testing and timing.
  */

 #include "bsd_opt_atalk.h"
 #include "bsd_opt_inet.h"
 #include "bsd_opt_inet6.h"
 #include "bsd_opt_ipx.h"

 #include <sys/bsd_param.h>
 #include <sys/bsd_systm.h>
 #include <sys/bsd_kernel.h>
 #include <sys/bsd_mbuf.h>
 //#include <sys/bsd_module.h>
 #include <machine/bsd_bus.h>
 #include <sys/bsd_rman.h>
 #include <sys/bsd_socket.h>
 #include <sys/bsd_sockio.h>
 //#include <sys/bsd_sysctl.h>

 #include <net/bsd_if.h>
 //#include <net/bsd_if_clone.h>
 #include <net/bsd_if_types.h>
 #include <net/bsd_netisr.h>
 #include <net/bsd_route.h>
 //#include <net/bsd_bpf.h>
 #include <net/bsd_vnet.h>

 #ifdef	INET
 #include <netinet/bsd_in.h>
 #include <netinet/bsd_in_var.h>
 #endif

 #ifdef IPX
 #include <netipx/bsd_ipx.h>
 #include <netipx/bsd_ipx_if.h>
 #endif

 #ifdef INET6
 #ifndef INET
 #include <netinet/bsd_in.h>
 #endif
 #include <netinet6/bsd_in6_var.h>
 #include <netinet/bsd_ip6.h>
 #endif

 #ifdef NETATALK
 #include <netatalk/bsd_at.h>
 #include <netatalk/bsd_at_var.h>
 #endif

 //#include <security/mac/bsd_mac_framework.h>

 #ifdef TINY_LOMTU
 #define	LOMTU	(1024+512)
 #elif defined(LARGE_LOMTU)
 #define LOMTU	131072
 #else
 #define LOMTU	16384
 #endif

 #define	LO_CSUM_FEATURES	(CSUM_IP | CSUM_TCP | CSUM_UDP | CSUM_SCTP)
 #define	LO_CSUM_SET		(CSUM_DATA_VALID | CSUM_PSEUDO_HDR | \
 				    CSUM_IP_CHECKED | CSUM_IP_VALID | \
 				    CSUM_SCTP_VALID)

 int		loioctl(struct ifnet *, u_long, caddr_t);
 static void	lortrequest(int, struct rtentry *, struct rt_addrinfo *);
 int		looutput(struct ifnet *ifp, struct mbuf *m,
 		    struct sockaddr *dst, struct route *ro);
 //static int	lo_create(char*, int, caddr_t);
 //static void	lo_destroy(struct ifnet *);

 VNET_DEFINE(struct ifnet *, loif);	/* Used externally */

 #if 0//def VIMAGE
 static VNET_DEFINE(struct ifc_simple_data, lo_cloner_data);
 static VNET_DEFINE(struct if_clone, lo_cloner);
 #define	V_lo_cloner_data	VNET(lo_cloner_data)
 #define	V_lo_cloner		VNET(lo_cloner)
 #endif

 //IFC_SIMPLE_DECLARE(lo, 1);

 #if 0
 static void
 lo_destroy(struct ifnet *ifp)
 {

 #ifndef VIMAGE
 	/* XXX: destroying lo0 will lead to panics. */
 	KASSERT(V_loif != ifp, ("%s: destroying lo0", __func__));
 #endif

 	//bpfdetach(ifp);
 	if_detach(ifp);
 	if_free(ifp);
 }
 #endif //0

 #if 0
 static int
 lo_create(char* name, int unit, caddr_t params)
 {
 	struct ifnet *ifp;
     struct ifreq ifr;
     struct sockaddr_in *lo_addr;

 	ifp = if_alloc(IFT_LOOP);
 	if (ifp == NULL)
 		return (ENOSPC);

 	if_initname(ifp, name, unit);
 	ifp->if_mtu = LOMTU;
 	ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
 	ifp->if_ioctl = loioctl;
 	ifp->if_output = looutput;
 	ifp->if_snd.ifq_maxlen = ifqmaxlen;
 	ifp->if_capabilities = ifp->if_capenable = IFCAP_HWCSUM;
 	ifp->if_hwassist = LO_CSUM_FEATURES;
 	if_attach(ifp);
 	//bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 	if (V_loif == NULL)
 		V_loif = ifp;

     memset(&ifr, 0, sizeof(ifr));
  	bcopy(name, ifr.ifr_name, sizeof(ifr.ifr_name));

     lo_addr = (struct sockaddr_in*)&(ifr.ifr_addr);
     lo_addr->sin_len = sizeof(struct sockaddr_in);
     lo_addr->sin_family = AF_INET;
     lo_addr->sin_port = 0;
     lo_addr->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
     bzero(&(lo_addr->sin_zero),8);

     in_control(NULL, SIOCSIFADDR,  (caddr_t)&ifr, ifp, NULL);
 	return (0);
 }

 static void
 vnet_loif_init(const void *unused )
 {
 #ifdef VIMAGE
 //	V_lo_cloner = lo_cloner;
 //	V_lo_cloner_data = lo_cloner_data;
 //	V_lo_cloner.ifc_data = &V_lo_cloner_data;
 //	if_clone_attach(&V_lo_cloner);
 #else
 //	if_clone_attach(&lo_cloner);
     lo_create("loopback", 1500, 0);
 #endif
 }
 #endif //0

 //VNET_SYSINIT(vnet_loif_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
 //   vnet_loif_init, NULL);

 #ifdef VIMAGE
 static void
 vnet_loif_uninit(const void *unused )
 {

 //	if_clone_detach(&V_lo_cloner);
 	V_loif = NULL;
 }
 VNET_SYSUNINIT(vnet_loif_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
     vnet_loif_uninit, NULL);
 #endif
 /*
 static int
 loop_modevent(module_t mod, int type, void *data)
 {

 	switch (type) {
 	case MOD_LOAD:
 		break;

 	case MOD_UNLOAD:
 		printf("loop module unload - not possible for this module type\n");
 		return (EINVAL);

 	default:
 		return (EOPNOTSUPP);
 	}
 	return (0);
 }

 static moduledata_t loop_mod = {
 	"loop",
 	loop_modevent,
 	0
 };

 DECLARE_MODULE(loop, loop_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
 */
 int
 looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
     struct route *ro)
 {
 	u_int32_t af;
 	struct rtentry *rt = NULL;
 #ifdef MAC
 	int error;
 #endif

 	M_ASSERTPKTHDR(m); /* check if we have the packet header */

 	if (ro != NULL)
 		rt = ro->ro_rt;
 #ifdef MAC
 	error = mac_ifnet_check_transmit(ifp, m);
 	if (error) {
 		m_freem(m);
 		return (error);
 	}
 #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;

 	/* BPF writes need to be handled specially. */
 	if (dst->sa_family == AF_UNSPEC) {
 		bcopy(dst->sa_data, &af, sizeof(af));
 		dst->sa_family = af;
 	}

 #if 1	/* XXX */
 	switch (dst->sa_family) {
 	case AF_INET:
 		if (ifp->if_capenable & IFCAP_RXCSUM) {
 			m->m_pkthdr.csum_data = 0xffff;
 			m->m_pkthdr.csum_flags = LO_CSUM_SET;
 		}
 		m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES;
 	case AF_INET6:
 	case AF_IPX:
 	case AF_APPLETALK:
 		break;
 	default:
 		printf("looutput: af=%d unexpected\n", dst->sa_family);
 		m_freem(m);
 		return (EAFNOSUPPORT);
 	}
 #endif
 	return (if_simloop(ifp, m, dst->sa_family, 0));
 }

 /*
  * if_simloop()
  *
  * This function is to support software emulation of hardware loopback,
  * i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
  * hear their own broadcasts, we create a copy of the packet that we
  * would normally receive via a hardware loopback.
  *
  * This function expects the packet to include the media header of length hlen.
  */
 int
 if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen)
 {
 	int isr;

 	M_ASSERTPKTHDR(m);
 	m_tag_delete_nonpersistent(m);
 	m->m_pkthdr.rcvif = ifp;

 #ifdef MAC
 	mac_ifnet_create_mbuf(ifp, m);
 #endif

 	/*
 	 * Let BPF see incoming packet in the following manner:
 	 *  - Emulated packet loopback for a simplex interface
 	 *    (net/if_ethersubr.c)
 	 *	-> passes it to ifp's BPF
 	 *  - IPv4/v6 multicast packet loopback (netinet(6)/ip(6)_output.c)
 	 *	-> not passes it to any BPF
 	 *  - Normal packet loopback from myself to myself (net/if_loop.c)
 	 *	-> passes to lo0's BPF (even in case of IPv6, where ifp!=lo0)
 	 */
 //	if (hlen > 0) {
 //		if (bpf_peers_present(ifp->if_bpf)) {
 //			bpf_mtap(ifp->if_bpf, m);
 //		}
 //	} else {
 //		if (bpf_peers_present(V_loif->if_bpf)) {
 //			if ((m->m_flags & M_MCAST) == 0 || V_loif == ifp) {
 //				/* XXX beware sizeof(af) != 4 */
 //				u_int32_t af1 = af;
 //
 //				/*
 //				 * We need to prepend the address family.
 //				 */
 //				bpf_mtap2(V_loif->if_bpf, &af1, sizeof(af1), m);
 //			}
 //		}
 //	}

 	/* Strip away media header */
 	if (hlen > 0) {
 		m_adj(m, hlen);
 #ifndef __NO_STRICT_ALIGNMENT
 		/*
 		 * Some archs do not like unaligned data, so
 		 * we move data down in the first mbuf.
 		 */
 		if (mtod(m, vm_offset_t) & 3) {
 			KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
 			bcopy(m->m_data,
 			    (char *)(mtod(m, vm_offset_t)
 				- (mtod(m, vm_offset_t) & 3)),
 			    m->m_len);
 			m->m_data -= (mtod(m,vm_offset_t) & 3);
 		}
 #endif
 	}

 	/* Deliver to upper layer protocol */
 	switch (af) {
 #ifdef INET
 	case AF_INET:
 		isr = NETISR_IP;
 		break;
 #endif
 #ifdef INET6
 	case AF_INET6:
 		m->m_flags |= M_LOOP;
 		isr = NETISR_IPV6;
 		break;
 #endif
 #ifdef IPX
 	case AF_IPX:
 		isr = NETISR_IPX;
 		break;
 #endif
 #ifdef NETATALK
 	case AF_APPLETALK:
 		isr = NETISR_ATALK2;
 		break;
 #endif
 	default:
 		printf("if_simloop: can't handle af=%d\n", af);
 		m_freem(m);
 		return (EAFNOSUPPORT);
 	}
 	ifp->if_ipackets++;
 	ifp->if_ibytes += m->m_pkthdr.len;
 	netisr_queue(isr, m);	/* mbuf is free'd on failure. */
 	return (0);
 }

 /* ARGSUSED */
 static void
 lortrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
 {

 	RT_LOCK_ASSERT(rt);
 	rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
 }

 /*
  * Process an ioctl request.
  */
 /* ARGSUSED */
 int
 loioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 {
 	struct ifaddr *ifa;
 	struct ifreq *ifr = (struct ifreq *)data;
 	int error = 0, mask;

 	switch (cmd) {
 	case SIOCSIFADDR:
 		ifp->if_flags |= IFF_UP;
 		ifp->if_drv_flags |= IFF_DRV_RUNNING;
 		ifa = (struct ifaddr *)data;
 		ifa->ifa_rtrequest = lortrequest;
 		/*
 		 * 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 SIOCSIFMTU:
 		ifp->if_mtu = ifr->ifr_mtu;
 		break;

 	case SIOCSIFFLAGS:
 		break;

 	case SIOCSIFCAP:
 		mask = ifp->if_capenable ^ ifr->ifr_reqcap;
 		if ((mask & IFCAP_RXCSUM) != 0)
 			ifp->if_capenable ^= IFCAP_RXCSUM;
 		if ((mask & IFCAP_TXCSUM) != 0)
 			ifp->if_capenable ^= IFCAP_TXCSUM;
 		if (ifp->if_capenable & IFCAP_TXCSUM)
 			ifp->if_hwassist = LO_CSUM_FEATURES;
 		else
 			ifp->if_hwassist = 0;
 		break;

 	default:
 		error = EINVAL;
 	}
 	return (error);
 }
	/*-
	* 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.
	*
	* @(#)if_loop.c 8.2 (Berkeley) 1/9/95
	* $FreeBSD$
	*/

	/*
	* Loopback interface driver for protocol testing and timing.
	*/

	#include "bsd_opt_atalk.h"
	#include "bsd_opt_inet.h"
	#include "bsd_opt_inet6.h"
	#include "bsd_opt_ipx.h"

	#include <sys/bsd_param.h>
	#include <sys/bsd_systm.h>
	#include <sys/bsd_kernel.h>
	#include <sys/bsd_mbuf.h>
	//#include <sys/bsd_module.h>
	#include <machine/bsd_bus.h>
	#include <sys/bsd_rman.h>
	#include <sys/bsd_socket.h>
	#include <sys/bsd_sockio.h>
	//#include <sys/bsd_sysctl.h>

	#include <net/bsd_if.h>
	//#include <net/bsd_if_clone.h>
	#include <net/bsd_if_types.h>
	#include <net/bsd_netisr.h>
	#include <net/bsd_route.h>
	//#include <net/bsd_bpf.h>
	#include <net/bsd_vnet.h>

	#ifdef INET
	#include <netinet/bsd_in.h>
	#include <netinet/bsd_in_var.h>
	#endif

	#ifdef IPX
	#include <netipx/bsd_ipx.h>
	#include <netipx/bsd_ipx_if.h>
	#endif

	#ifdef INET6
	#ifndef INET
	#include <netinet/bsd_in.h>
	#endif
	#include <netinet6/bsd_in6_var.h>
	#include <netinet/bsd_ip6.h>
	#endif

	#ifdef NETATALK
	#include <netatalk/bsd_at.h>
	#include <netatalk/bsd_at_var.h>
	#endif

	//#include <security/mac/bsd_mac_framework.h>

	#ifdef TINY_LOMTU
	#define LOMTU (1024+512)
	#elif defined(LARGE_LOMTU)
	#define LOMTU 131072
	#else
	#define LOMTU 16384
	#endif

	#define LO_CSUM_FEATURES (CSUM_IP \| CSUM_TCP \| CSUM_UDP \| CSUM_SCTP)
	#define LO_CSUM_SET (CSUM_DATA_VALID \| CSUM_PSEUDO_HDR \| \
	CSUM_IP_CHECKED \| CSUM_IP_VALID \| \
	CSUM_SCTP_VALID)

	int loioctl(struct ifnet *, u_long, caddr_t);
	static void lortrequest(int, struct rtentry , struct rt_addrinfo );
	int looutput(struct ifnet ifp, struct mbuf m,
	struct sockaddr dst, struct route ro);
	//static int lo_create(char*, int, caddr_t);
	//static void lo_destroy(struct ifnet *);

	VNET_DEFINE(struct ifnet , loif); / Used externally */

	#if 0//def VIMAGE
	static VNET_DEFINE(struct ifc_simple_data, lo_cloner_data);
	static VNET_DEFINE(struct if_clone, lo_cloner);
	#define V_lo_cloner_data VNET(lo_cloner_data)
	#define V_lo_cloner VNET(lo_cloner)
	#endif

	//IFC_SIMPLE_DECLARE(lo, 1);

	#if 0
	static void
	lo_destroy(struct ifnet *ifp)
	{

	#ifndef VIMAGE
	/* XXX: destroying lo0 will lead to panics. */
	KASSERT(V_loif != ifp, ("%s: destroying lo0", __func__));
	#endif

	//bpfdetach(ifp);
	if_detach(ifp);
	if_free(ifp);
	}
	#endif //0

	#if 0
	static int
	lo_create(char* name, int unit, caddr_t params)
	{
	struct ifnet *ifp;
	struct ifreq ifr;
	struct sockaddr_in *lo_addr;

	ifp = if_alloc(IFT_LOOP);
	if (ifp == NULL)
	return (ENOSPC);

	if_initname(ifp, name, unit);
	ifp->if_mtu = LOMTU;
	ifp->if_flags = IFF_LOOPBACK \| IFF_MULTICAST;
	ifp->if_ioctl = loioctl;
	ifp->if_output = looutput;
	ifp->if_snd.ifq_maxlen = ifqmaxlen;
	ifp->if_capabilities = ifp->if_capenable = IFCAP_HWCSUM;
	ifp->if_hwassist = LO_CSUM_FEATURES;
	if_attach(ifp);
	//bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
	if (V_loif == NULL)
	V_loif = ifp;

	memset(&ifr, 0, sizeof(ifr));
	bcopy(name, ifr.ifr_name, sizeof(ifr.ifr_name));

	lo_addr = (struct sockaddr_in*)&(ifr.ifr_addr);
	lo_addr->sin_len = sizeof(struct sockaddr_in);
	lo_addr->sin_family = AF_INET;
	lo_addr->sin_port = 0;
	lo_addr->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
	bzero(&(lo_addr->sin_zero),8);

	in_control(NULL, SIOCSIFADDR, (caddr_t)&ifr, ifp, NULL);
	return (0);
	}

	static void
	vnet_loif_init(const void *unused )
	{
	#ifdef VIMAGE
	// V_lo_cloner = lo_cloner;
	// V_lo_cloner_data = lo_cloner_data;
	// V_lo_cloner.ifc_data = &V_lo_cloner_data;
	// if_clone_attach(&V_lo_cloner);
	#else
	// if_clone_attach(&lo_cloner);
	lo_create("loopback", 1500, 0);
	#endif
	}
	#endif //0

	//VNET_SYSINIT(vnet_loif_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
	// vnet_loif_init, NULL);

	#ifdef VIMAGE
	static void
	vnet_loif_uninit(const void *unused )
	{

	// if_clone_detach(&V_lo_cloner);
	V_loif = NULL;
	}
	VNET_SYSUNINIT(vnet_loif_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
	vnet_loif_uninit, NULL);
	#endif
	/*
	static int
	loop_modevent(module_t mod, int type, void *data)
	{

	switch (type) {
	case MOD_LOAD:
	break;

	case MOD_UNLOAD:
	printf("loop module unload - not possible for this module type\n");
	return (EINVAL);

	default:
	return (EOPNOTSUPP);
	}
	return (0);
	}

	static moduledata_t loop_mod = {
	"loop",
	loop_modevent,
	0
	};

	DECLARE_MODULE(loop, loop_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
	*/
	int
	looutput(struct ifnet ifp, struct mbuf m, struct sockaddr *dst,
	struct route *ro)
	{
	u_int32_t af;
	struct rtentry *rt = NULL;
	#ifdef MAC
	int error;
	#endif

	M_ASSERTPKTHDR(m); /* check if we have the packet header */

	if (ro != NULL)
	rt = ro->ro_rt;
	#ifdef MAC
	error = mac_ifnet_check_transmit(ifp, m);
	if (error) {
	m_freem(m);
	return (error);
	}
	#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;

	/* BPF writes need to be handled specially. */
	if (dst->sa_family == AF_UNSPEC) {
	bcopy(dst->sa_data, &af, sizeof(af));
	dst->sa_family = af;
	}

	#if 1 /* XXX */
	switch (dst->sa_family) {
	case AF_INET:
	if (ifp->if_capenable & IFCAP_RXCSUM) {
	m->m_pkthdr.csum_data = 0xffff;
	m->m_pkthdr.csum_flags = LO_CSUM_SET;
	}
	m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES;
	case AF_INET6:
	case AF_IPX:
	case AF_APPLETALK:
	break;
	default:
	printf("looutput: af=%d unexpected\n", dst->sa_family);
	m_freem(m);
	return (EAFNOSUPPORT);
	}
	#endif
	return (if_simloop(ifp, m, dst->sa_family, 0));
	}

	/*
	* if_simloop()
	*
	* This function is to support software emulation of hardware loopback,
	* i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
	* hear their own broadcasts, we create a copy of the packet that we
	* would normally receive via a hardware loopback.
	*
	* This function expects the packet to include the media header of length hlen.
	*/
	int
	if_simloop(struct ifnet ifp, struct mbuf m, int af, int hlen)
	{
	int isr;

	M_ASSERTPKTHDR(m);
	m_tag_delete_nonpersistent(m);
	m->m_pkthdr.rcvif = ifp;

	#ifdef MAC
	mac_ifnet_create_mbuf(ifp, m);
	#endif

	/*
	* Let BPF see incoming packet in the following manner:
	* - Emulated packet loopback for a simplex interface
	* (net/if_ethersubr.c)
	* -> passes it to ifp's BPF
	* - IPv4/v6 multicast packet loopback (netinet(6)/ip(6)_output.c)
	* -> not passes it to any BPF
	* - Normal packet loopback from myself to myself (net/if_loop.c)
	* -> passes to lo0's BPF (even in case of IPv6, where ifp!=lo0)
	*/
	// if (hlen > 0) {
	// if (bpf_peers_present(ifp->if_bpf)) {
	// bpf_mtap(ifp->if_bpf, m);
	// }
	// } else {
	// if (bpf_peers_present(V_loif->if_bpf)) {
	// if ((m->m_flags & M_MCAST) == 0 \|\| V_loif == ifp) {
	// /* XXX beware sizeof(af) != 4 */
	// u_int32_t af1 = af;
	//
	// /*
	// * We need to prepend the address family.
	// */
	// bpf_mtap2(V_loif->if_bpf, &af1, sizeof(af1), m);
	// }
	// }
	// }

	/* Strip away media header */
	if (hlen > 0) {
	m_adj(m, hlen);
	#ifndef __NO_STRICT_ALIGNMENT
	/*
	* Some archs do not like unaligned data, so
	* we move data down in the first mbuf.
	*/
	if (mtod(m, vm_offset_t) & 3) {
	KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
	bcopy(m->m_data,
	(char *)(mtod(m, vm_offset_t)
	- (mtod(m, vm_offset_t) & 3)),
	m->m_len);
	m->m_data -= (mtod(m,vm_offset_t) & 3);
	}
	#endif
	}

	/* Deliver to upper layer protocol */
	switch (af) {
	#ifdef INET
	case AF_INET:
	isr = NETISR_IP;
	break;
	#endif
	#ifdef INET6
	case AF_INET6:
	m->m_flags \|= M_LOOP;
	isr = NETISR_IPV6;
	break;
	#endif
	#ifdef IPX
	case AF_IPX:
	isr = NETISR_IPX;
	break;
	#endif
	#ifdef NETATALK
	case AF_APPLETALK:
	isr = NETISR_ATALK2;
	break;
	#endif
	default:
	printf("if_simloop: can't handle af=%d\n", af);
	m_freem(m);
	return (EAFNOSUPPORT);
	}
	ifp->if_ipackets++;
	ifp->if_ibytes += m->m_pkthdr.len;
	netisr_queue(isr, m); /* mbuf is free'd on failure. */
	return (0);
	}

	/* ARGSUSED */
	static void
	lortrequest(int cmd, struct rtentry rt, struct rt_addrinfo info)
	{

	RT_LOCK_ASSERT(rt);
	rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
	}

	/*
	* Process an ioctl request.
	*/
	/* ARGSUSED */
	int
	loioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
	{
	struct ifaddr *ifa;
	struct ifreq ifr = (struct ifreq )data;
	int error = 0, mask;

	switch (cmd) {
	case SIOCSIFADDR:
	ifp->if_flags \|= IFF_UP;
	ifp->if_drv_flags \|= IFF_DRV_RUNNING;
	ifa = (struct ifaddr *)data;
	ifa->ifa_rtrequest = lortrequest;
	/*
	* 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 SIOCSIFMTU:
	ifp->if_mtu = ifr->ifr_mtu;
	break;

	case SIOCSIFFLAGS:
	break;

	case SIOCSIFCAP:
	mask = ifp->if_capenable ^ ifr->ifr_reqcap;
	if ((mask & IFCAP_RXCSUM) != 0)
	ifp->if_capenable ^= IFCAP_RXCSUM;
	if ((mask & IFCAP_TXCSUM) != 0)
	ifp->if_capenable ^= IFCAP_TXCSUM;
	if (ifp->if_capenable & IFCAP_TXCSUM)
	ifp->if_hwassist = LO_CSUM_FEATURES;
	else
	ifp->if_hwassist = 0;
	break;

	default:
	error = EINVAL;
	}
	return (error);
	}