[apple/xnu.git] / bsd / net / if_loop.c

/*
 * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * 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.
 *
 *	@(#)if_loop.c	8.1 (Berkeley) 6/10/93
 * $FreeBSD: src/sys/net/if_loop.c,v 1.47.2.5 2001/07/03 11:01:41 ume Exp $
 */
/*
 * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce
 * support for mandatory and extensible security protections.  This notice
 * is included in support of clause 2.2 (b) of the Apple Public License,
 * Version 2.0.
 */

/*
 * Loopback interface driver for protocol testing and timing.
 */
#include "loop.h"
#if NLOOP > 0

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>

#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/bpf.h>
#include <sys/malloc.h>

#if	INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#endif

#if INET6
#if !INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#endif

#include <net/dlil.h>
#include <net/kpi_protocol.h>

#if NETAT
extern struct ifqueue atalkintrq;
#endif

#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpfdesc.h>
#endif

#if CONFIG_MACF_NET
#include <security/mac_framework.h>
#endif

#define NLOOP_ATTACHMENTS (NLOOP * 12)

struct lo_statics_str {
	int				bpf_mode;
	bpf_packet_func	bpf_callback;
};

void loopattach(void);

static struct lo_statics_str lo_statics[NLOOP];
int loopattach_done = 0; /* used to sync ip6_init2 loopback configuration */

#ifdef TINY_LOMTU
#define	LOMTU	(1024+512)
#else
#define LOMTU	16384
#endif

ifnet_t	lo_ifp = NULL;

struct	loopback_header {
	protocol_family_t	protocol;
};

static void lo_reg_if_mods(void);

/* Local forward declerations */

static errno_t
lo_demux(
    __unused ifnet_t	ifp,
    __unused mbuf_t		m,
    char				*frame_header,
    protocol_family_t	*protocol_family)
{
	struct loopback_header *header = (struct loopback_header *)frame_header;
	
	*protocol_family = header->protocol;
	
	return 0;
}


static errno_t
lo_framer(
    __unused ifnet_t				ifp,
    mbuf_t							*m,
    __unused const struct sockaddr	*dest,
    __unused const char            	*dest_linkaddr,
    const char						*frame_type)
{
	struct loopback_header  *header;

	M_PREPEND(*m, sizeof(struct loopback_header), M_WAITOK);
	header = mtod(*m, struct loopback_header*);
	header->protocol = *(const u_long*)frame_type;
	return 0;
}

static errno_t
lo_add_proto(
    __unused ifnet_t						interface,
	__unused protocol_family_t				protocol_family,
	__unused const struct ifnet_demux_desc	*demux_array,
	__unused u_int32_t						demux_count)
{
    return 0;
}


static errno_t
lo_del_proto(
	__unused ifnet_t			ifp,
	__unused protocol_family_t	protocol)
{
	return 0;
}

static int
lo_output(
	ifnet_t	ifp,
	mbuf_t	m_list)
{
	mbuf_t	m;
	
	for (m = m_list; m; m = m->m_nextpkt) {
		if ((m->m_flags & M_PKTHDR) == 0)
			panic("lo_output: no HDR");

		/*
		 * Don't overwrite the rcvif field if it is in use.
		 *  This is used to match multicast packets, sent looping
		 *  back, with the appropriate group record on input.
		 */
		if (m->m_pkthdr.rcvif == NULL)
			m->m_pkthdr.rcvif = ifp;

		ifp->if_ibytes += m->m_pkthdr.len;
		ifp->if_obytes += m->m_pkthdr.len;

		ifp->if_opackets++;
		ifp->if_ipackets++;

		m->m_pkthdr.header = mtod(m, char *);
		if (apple_hwcksum_tx != 0) {
			/* loopback checksums are always OK */
			m->m_pkthdr.csum_data = 0xffff;
			m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_PSEUDO_HDR |
				CSUM_IP_CHECKED | CSUM_IP_VALID;
		}
		m_adj(m, sizeof(struct loopback_header));

		{
			/* We need to prepend the address family as a four byte field. */
			u_int32_t protocol_family =
				((struct loopback_header*)m->m_pkthdr.header)->protocol;
		
			bpf_tap_out(ifp, DLT_NULL, m, &protocol_family, sizeof(protocol_family));
		}
	}

	return ifnet_input(ifp, m_list, NULL);
}


/*
 * This is a common pre-output route used by INET and INET6. This could
 * (should?) be split into separate pre-output routines for each protocol.
 */

static errno_t
lo_pre_output(
	__unused ifnet_t	ifp,
	protocol_family_t	protocol_family,
	mbuf_t				*m,
	__unused const struct sockaddr	*dst,
	void				*route,
	char				*frame_type,
	__unused char		*dst_addr)

{
	register struct rtentry *rt = route;

	(*m)->m_flags |= M_LOOP;

	if (((*m)->m_flags & M_PKTHDR) == 0)
		panic("looutput no HDR");

	if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
		if (rt->rt_flags & RTF_BLACKHOLE) {
			m_freem(*m);
			return EJUSTRETURN;
		}
		else
			return ((rt->rt_flags & RTF_HOST) ? EHOSTUNREACH : ENETUNREACH);
	}
	
	*(protocol_family_t*)frame_type = protocol_family;

	return 0;
}

/*
 *  lo_input - This should work for all attached protocols that use the
 *             ifq/schednetisr input mechanism.
 */
static errno_t
lo_input(
	__unused ifnet_t			ifp,
	__unused protocol_family_t	protocol_family,
	mbuf_t						m)
{
	if (proto_input(protocol_family, m) != 0)
		m_freem(m);
	return (0);
}


/* ARGSUSED */
static void
lortrequest(
	__unused int cmd,
	struct rtentry *rt,
	__unused struct sockaddr *sa)
{
	if (rt) {
		rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
		/*
		 * For optimal performance, the send and receive buffers
		 * should be at least twice the MTU plus a little more for
		 * overhead.
		 */
		rt->rt_rmx.rmx_recvpipe = 
			rt->rt_rmx.rmx_sendpipe = 3 * LOMTU;
	}
}

/*
 * Process an ioctl request.
 */
static errno_t
loioctl(
	ifnet_t		ifp,
	u_int32_t	cmd,
	void*		data)
{
	register struct ifaddr *ifa;
	register struct ifreq *ifr = (struct ifreq *)data;
	register int error = 0;

	switch (cmd) {

	case SIOCSIFADDR:
		ifnet_set_flags(ifp, IFF_UP | IFF_RUNNING, IFF_UP | IFF_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) {

#if INET
		case AF_INET:
			break;
#endif
#if INET6
		case AF_INET6:
			break;
#endif

		default:
			error = EAFNOSUPPORT;
			break;
		}
		break;

	case SIOCSIFMTU:
		ifp->if_mtu = ifr->ifr_mtu;
		break;

	case SIOCSIFFLAGS:
		break;

	default:
		error = EOPNOTSUPP;
		break;
	}
	return (error);
}
#endif /* NLOOP > 0 */


static errno_t  lo_attach_proto(ifnet_t ifp, protocol_family_t protocol_family)
{
	struct ifnet_attach_proto_param_v2	proto;
	errno_t							result = 0;
	
	bzero(&proto, sizeof(proto));
	proto.input = lo_input;
	proto.pre_output = lo_pre_output;
	
	result = ifnet_attach_protocol_v2(ifp, protocol_family, &proto);

	if (result && result != EEXIST) {
		printf("lo_attach_proto: ifnet_attach_protocol for %u returned=%d\n",
			   protocol_family, result);
	}
	
	return result;
}

static void lo_reg_if_mods(void)
{
     int error;

	/* Register protocol registration functions */
	if ((error = proto_register_plumber(PF_INET, APPLE_IF_FAM_LOOPBACK, lo_attach_proto, NULL)) != 0)
		printf("proto_register_plumber failed for AF_INET error=%d\n", error);

	if ((error = proto_register_plumber(PF_INET6, APPLE_IF_FAM_LOOPBACK, lo_attach_proto, NULL)) != 0)
		printf("proto_register_plumber failed for AF_INET6 error=%d\n", error);
}

static errno_t
lo_set_bpf_tap(
	ifnet_t			ifp,
	bpf_tap_mode	mode,
	bpf_packet_func	bpf_callback)
{

  /*
   * NEED MUTEX HERE XXX
   */
	if (mode == BPF_TAP_DISABLE) {
		lo_statics[ifp->if_unit].bpf_mode = mode;
		lo_statics[ifp->if_unit].bpf_callback = bpf_callback;
	}
	else {
		lo_statics[ifp->if_unit].bpf_callback = bpf_callback;
		lo_statics[ifp->if_unit].bpf_mode = mode;		
	}

	return 0;
}


/* ARGSUSED */
void
loopattach(void)
{
	struct ifnet_init_params	lo_init;
	errno_t	result = 0;

#if NLOOP != 1
More than one loopback interface is not supported.
#endif

	lo_reg_if_mods();
	
	lo_statics[0].bpf_callback = 0;
	lo_statics[0].bpf_mode      = BPF_TAP_DISABLE;
	
	bzero(&lo_init, sizeof(lo_init));
	lo_init.name = "lo";
	lo_init.unit = 0;
	lo_init.family = IFNET_FAMILY_LOOPBACK;
	lo_init.type = IFT_LOOP;
	lo_init.output = lo_output;
	lo_init.demux = lo_demux;
	lo_init.add_proto = lo_add_proto;
	lo_init.del_proto = lo_del_proto;
	lo_init.framer = lo_framer;
	lo_init.softc = &lo_statics[0];
	lo_init.ioctl = loioctl;
	lo_init.set_bpf_tap = lo_set_bpf_tap;
	result = ifnet_allocate(&lo_init, &lo_ifp);
	if (result != 0) {
		printf("ifnet_allocate for lo0 failed - %d\n", result);
		return;
	}
	
	ifnet_set_mtu(lo_ifp, LOMTU);
	ifnet_set_flags(lo_ifp, IFF_LOOPBACK | IFF_MULTICAST, IFF_LOOPBACK | IFF_MULTICAST);
	ifnet_set_offload(lo_ifp, IFNET_CSUM_IP | IFNET_CSUM_TCP | IFNET_CSUM_UDP | IFNET_CSUM_FRAGMENT | IFNET_IP_FRAGMENT | IFNET_MULTIPAGES);
	ifnet_set_hdrlen(lo_ifp, sizeof(struct loopback_header));
	ifnet_set_eflags(lo_ifp, IFEF_SENDLIST, IFEF_SENDLIST);

#if CONFIG_MACF_NET
		mac_ifnet_label_init(ifp);
#endif

	result = ifnet_attach(lo_ifp, NULL);
	if (result != 0) {
		printf("ifnet_attach lo0 failed - %d\n", result);
		return;
	}
	bpfattach(lo_ifp, DLT_NULL, sizeof(u_int));
	
	loopattach_done = 1;
}
Commit	Line	Data
1c79356b	1	/*
2d21ac55	2	* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
5d5c5d0d	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* Copyright (c) 1982, 1986, 1993
	30	* The Regents of the University of California. All rights reserved.
	31	*
	32	* Redistribution and use in source and binary forms, with or without
	33	* modification, are permitted provided that the following conditions
	34	* are met:
	35	* 1. Redistributions of source code must retain the above copyright
	36	* notice, this list of conditions and the following disclaimer.
	37	* 2. Redistributions in binary form must reproduce the above copyright
	38	* notice, this list of conditions and the following disclaimer in the
	39	* documentation and/or other materials provided with the distribution.
	40	* 3. All advertising materials mentioning features or use of this software
	41	* must display the following acknowledgement:
	42	* This product includes software developed by the University of
	43	* California, Berkeley and its contributors.
	44	* 4. Neither the name of the University nor the names of its contributors
	45	* may be used to endorse or promote products derived from this software
	46	* without specific prior written permission.
	47	*
	48	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	49	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	50	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	51	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	52	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	53	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	54	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	55	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	56	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	57	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	58	* SUCH DAMAGE.
	59	*
	60	* @(#)if_loop.c 8.1 (Berkeley) 6/10/93
9bccf70c	61	* $FreeBSD: src/sys/net/if_loop.c,v 1.47.2.5 2001/07/03 11:01:41 ume Exp $
1c79356b	62	*/
2d21ac55 A	63	/*
	64	* NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce
	65	* support for mandatory and extensible security protections. This notice
	66	* is included in support of clause 2.2 (b) of the Apple Public License,
	67	* Version 2.0.
	68	*/
1c79356b A	69
	70	/*
	71	* Loopback interface driver for protocol testing and timing.
	72	*/
	73	#include "loop.h"
	74	#if NLOOP > 0
	75
	76	#include <sys/param.h>
	77	#include <sys/systm.h>
	78	#include <sys/kernel.h>
	79	#include <sys/mbuf.h>
	80	#include <sys/socket.h>
	81	#include <sys/sockio.h>
	82
	83	#include <net/if.h>
	84	#include <net/if_types.h>
1c79356b A	85	#include <net/route.h>
	86	#include <net/bpf.h>
	87	#include <sys/malloc.h>
	88
	89	#if INET
	90	#include <netinet/in.h>
	91	#include <netinet/in_var.h>
	92	#endif
	93
1c79356b	94	#if INET6
2d21ac55	95	#if !INET
1c79356b A	96	#include <netinet/in.h>
	97	#endif
	98	#include <netinet6/in6_var.h>
	99	#include <netinet/ip6.h>
	100	#endif
	101
1c79356b	102	#include <net/dlil.h>
91447636	103	#include <net/kpi_protocol.h>
1c79356b A	104
	105	#if NETAT
	106	extern struct ifqueue atalkintrq;
	107	#endif
	108
	109	#include "bpfilter.h"
	110	#if NBPFILTER > 0
	111	#include <net/bpfdesc.h>
	112	#endif
	113
2d21ac55 A	114	#if CONFIG_MACF_NET
	115	#include <security/mac_framework.h>
	116	#endif
	117
1c79356b A	118	#define NLOOP_ATTACHMENTS (NLOOP * 12)
	119
	120	struct lo_statics_str {
91447636 A	121	int bpf_mode;
91447636 A	122	bpf_packet_func bpf_callback;
1c79356b A	123	};
1c79356b A	124
2d21ac55	125	void loopattach(void);
1c79356b	126
91447636 A	127	static struct lo_statics_str lo_statics[NLOOP];
91447636 A	128	int loopattach_done = 0; /* used to sync ip6_init2 loopback configuration */
1c79356b A	129
	130	#ifdef TINY_LOMTU
	131	#define LOMTU (1024+512)
	132	#else
	133	#define LOMTU 16384
	134	#endif
	135
2d21ac55	136	ifnet_t lo_ifp = NULL;
1c79356b	137
91447636	138	struct loopback_header {
2d21ac55	139	protocol_family_t protocol;
91447636	140	};
1c79356b	141
2d21ac55	142	static void lo_reg_if_mods(void);
1c79356b	143
91447636	144	/* Local forward declerations */
1c79356b	145
91447636 A	146	static errno_t
	147	lo_demux(
	148	__unused ifnet_t ifp,
	149	__unused mbuf_t m,
	150	char *frame_header,
	151	protocol_family_t *protocol_family)
1c79356b	152	{
91447636 A	153	struct loopback_header header = (struct loopback_header )frame_header;
	154
	155	*protocol_family = header->protocol;
	156
	157	return 0;
1c79356b A	158	}
	159
	160
91447636 A	161	static errno_t
	162	lo_framer(
	163	__unused ifnet_t ifp,
	164	mbuf_t *m,
	165	__unused const struct sockaddr *dest,
	166	__unused const char *dest_linkaddr,
	167	const char *frame_type)
1c79356b	168	{
91447636	169	struct loopback_header *header;
1c79356b	170
91447636 A	171	M_PREPEND(*m, sizeof(struct loopback_header), M_WAITOK);
	172	header = mtod(m, struct loopback_header);
	173	header->protocol = (const u_long)frame_type;
1c79356b A	174	return 0;
	175	}
	176
91447636 A	177	static errno_t
91447636 A	178	lo_add_proto(
2d21ac55 A	179	__unused ifnet_t interface,
	180	__unused protocol_family_t protocol_family,
	181	__unused const struct ifnet_demux_desc *demux_array,
	182	__unused u_int32_t demux_count)
1c79356b A	183	{
	184	return 0;
	185	}
	186
	187
91447636 A	188	static errno_t
	189	lo_del_proto(
	190	__unused ifnet_t ifp,
	191	__unused protocol_family_t protocol)
1c79356b	192	{
91447636	193	return 0;
1c79356b A	194	}
	195
	196	static int
91447636	197	lo_output(
2d21ac55 A	198	ifnet_t ifp,
2d21ac55 A	199	mbuf_t m_list)
91447636	200	{
2d21ac55 A	201	mbuf_t m;
	202
	203	for (m = m_list; m; m = m->m_nextpkt) {
	204	if ((m->m_flags & M_PKTHDR) == 0)
	205	panic("lo_output: no HDR");
1c79356b	206
2d21ac55 A	207	/*
	208	* Don't overwrite the rcvif field if it is in use.
	209	* This is used to match multicast packets, sent looping
	210	* back, with the appropriate group record on input.
	211	*/
	212	if (m->m_pkthdr.rcvif == NULL)
	213	m->m_pkthdr.rcvif = ifp;
91447636	214
2d21ac55 A	215	ifp->if_ibytes += m->m_pkthdr.len;
2d21ac55 A	216	ifp->if_obytes += m->m_pkthdr.len;
91447636	217
2d21ac55 A	218	ifp->if_opackets++;
2d21ac55 A	219	ifp->if_ipackets++;
1c79356b	220
2d21ac55 A	221	m->m_pkthdr.header = mtod(m, char *);
	222	if (apple_hwcksum_tx != 0) {
	223	/* loopback checksums are always OK */
	224	m->m_pkthdr.csum_data = 0xffff;
	225	m->m_pkthdr.csum_flags = CSUM_DATA_VALID \| CSUM_PSEUDO_HDR \|
	226	CSUM_IP_CHECKED \| CSUM_IP_VALID;
	227	}
	228	m_adj(m, sizeof(struct loopback_header));
	229
	230	{
	231	/* We need to prepend the address family as a four byte field. */
	232	u_int32_t protocol_family =
	233	((struct loopback_header*)m->m_pkthdr.header)->protocol;
	234
	235	bpf_tap_out(ifp, DLT_NULL, m, &protocol_family, sizeof(protocol_family));
1c79356b	236	}
1c79356b	237	}
1c79356b	238
2d21ac55	239	return ifnet_input(ifp, m_list, NULL);
1c79356b A	240	}
	241
	242
	243	/*
91447636	244	* This is a common pre-output route used by INET and INET6. This could
1c79356b A	245	* (should?) be split into separate pre-output routines for each protocol.
	246	*/
	247
2d21ac55	248	static errno_t
91447636	249	lo_pre_output(
2d21ac55 A	250	__unused ifnet_t ifp,
	251	protocol_family_t protocol_family,
	252	mbuf_t *m,
91447636	253	__unused const struct sockaddr *dst,
2d21ac55 A	254	void *route,
	255	char *frame_type,
	256	__unused char *dst_addr)
1c79356b A	257
1c79356b A	258	{
2d21ac55 A	259	register struct rtentry *rt = route;
	260
	261	(*m)->m_flags \|= M_LOOP;
1c79356b	262
1c79356b A	263	if (((*m)->m_flags & M_PKTHDR) == 0)
	264	panic("looutput no HDR");
	265
	266	if (rt && rt->rt_flags & (RTF_REJECT\|RTF_BLACKHOLE)) {
91447636 A	267	if (rt->rt_flags & RTF_BLACKHOLE) {
	268	m_freem(*m);
	269	return EJUSTRETURN;
	270	}
	271	else
	272	return ((rt->rt_flags & RTF_HOST) ? EHOSTUNREACH : ENETUNREACH);
1c79356b	273	}
91447636	274
2d21ac55	275	(protocol_family_t)frame_type = protocol_family;
1c79356b A	276
	277	return 0;
	278	}
	279
1c79356b A	280	/*
	281	* lo_input - This should work for all attached protocols that use the
	282	* ifq/schednetisr input mechanism.
	283	*/
2d21ac55	284	static errno_t
91447636	285	lo_input(
2d21ac55 A	286	__unused ifnet_t ifp,
	287	__unused protocol_family_t protocol_family,
	288	mbuf_t m)
1c79356b	289	{
91447636	290	if (proto_input(protocol_family, m) != 0)
1c79356b	291	m_freem(m);
1c79356b A	292	return (0);
	293	}
	294
	295
	296
	297
	298	/* ARGSUSED */
	299	static void
91447636 A	300	lortrequest(
	301	__unused int cmd,
	302	struct rtentry *rt,
	303	__unused struct sockaddr *sa)
1c79356b A	304	{
	305	if (rt) {
	306	rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
	307	/*
	308	* For optimal performance, the send and receive buffers
	309	* should be at least twice the MTU plus a little more for
	310	* overhead.
	311	*/
	312	rt->rt_rmx.rmx_recvpipe =
	313	rt->rt_rmx.rmx_sendpipe = 3 * LOMTU;
	314	}
	315	}
	316
	317	/*
	318	* Process an ioctl request.
	319	*/
91447636 A	320	static errno_t
	321	loioctl(
	322	ifnet_t ifp,
	323	u_int32_t cmd,
	324	void* data)
1c79356b A	325	{
	326	register struct ifaddr *ifa;
	327	register struct ifreq ifr = (struct ifreq )data;
	328	register int error = 0;
	329
	330	switch (cmd) {
	331
	332	case SIOCSIFADDR:
91447636	333	ifnet_set_flags(ifp, IFF_UP \| IFF_RUNNING, IFF_UP \| IFF_RUNNING);
1c79356b A	334	ifa = (struct ifaddr *)data;
	335	ifa->ifa_rtrequest = lortrequest;
	336	/*
	337	* Everything else is done at a higher level.
	338	*/
	339	break;
	340
	341	case SIOCADDMULTI:
	342	case SIOCDELMULTI:
	343	if (ifr == 0) {
	344	error = EAFNOSUPPORT; /* XXX */
	345	break;
	346	}
	347	switch (ifr->ifr_addr.sa_family) {
	348
	349	#if INET
	350	case AF_INET:
	351	break;
	352	#endif
	353	#if INET6
	354	case AF_INET6:
	355	break;
	356	#endif
	357
	358	default:
	359	error = EAFNOSUPPORT;
	360	break;
	361	}
	362	break;
	363
	364	case SIOCSIFMTU:
	365	ifp->if_mtu = ifr->ifr_mtu;
	366	break;
	367
	368	case SIOCSIFFLAGS:
	369	break;
	370
	371	default:
	372	error = EOPNOTSUPP;
4a249263	373	break;
1c79356b A	374	}
	375	return (error);
	376	}
	377	#endif /* NLOOP > 0 */
	378
	379
2d21ac55	380	static errno_t lo_attach_proto(ifnet_t ifp, protocol_family_t protocol_family)
1c79356b	381	{
2d21ac55 A	382	struct ifnet_attach_proto_param_v2 proto;
2d21ac55 A	383	errno_t result = 0;
91447636	384
2d21ac55 A	385	bzero(&proto, sizeof(proto));
	386	proto.input = lo_input;
	387	proto.pre_output = lo_pre_output;
91447636	388
2d21ac55	389	result = ifnet_attach_protocol_v2(ifp, protocol_family, &proto);
1c79356b	390
2d21ac55 A	391	if (result && result != EEXIST) {
	392	printf("lo_attach_proto: ifnet_attach_protocol for %u returned=%d\n",
	393	protocol_family, result);
9bccf70c	394	}
91447636	395
2d21ac55	396	return result;
9bccf70c A	397	}
9bccf70c A	398
2d21ac55	399	static void lo_reg_if_mods(void)
55e303ae	400	{
55e303ae A	401	int error;
55e303ae A	402
55e303ae	403	/* Register protocol registration functions */
2d21ac55 A	404	if ((error = proto_register_plumber(PF_INET, APPLE_IF_FAM_LOOPBACK, lo_attach_proto, NULL)) != 0)
2d21ac55 A	405	printf("proto_register_plumber failed for AF_INET error=%d\n", error);
55e303ae	406
2d21ac55 A	407	if ((error = proto_register_plumber(PF_INET6, APPLE_IF_FAM_LOOPBACK, lo_attach_proto, NULL)) != 0)
2d21ac55 A	408	printf("proto_register_plumber failed for AF_INET6 error=%d\n", error);
55e303ae	409	}
1c79356b	410
91447636 A	411	static errno_t
	412	lo_set_bpf_tap(
	413	ifnet_t ifp,
	414	bpf_tap_mode mode,
	415	bpf_packet_func bpf_callback)
1c79356b A	416	{
	417
	418	/*
	419	* NEED MUTEX HERE XXX
	420	*/
	421	if (mode == BPF_TAP_DISABLE) {
	422	lo_statics[ifp->if_unit].bpf_mode = mode;
	423	lo_statics[ifp->if_unit].bpf_callback = bpf_callback;
	424	}
	425	else {
	426	lo_statics[ifp->if_unit].bpf_callback = bpf_callback;
	427	lo_statics[ifp->if_unit].bpf_mode = mode;
	428	}
	429
	430	return 0;
	431	}
	432
	433
	434	/* ARGSUSED */
	435	void
2d21ac55	436	loopattach(void)
1c79356b	437	{
2d21ac55 A	438	struct ifnet_init_params lo_init;
2d21ac55 A	439	errno_t result = 0;
1c79356b	440
2d21ac55 A	441	#if NLOOP != 1
	442	More than one loopback interface is not supported.
	443	#endif
1c79356b	444
2d21ac55 A	445	lo_reg_if_mods();
	446
	447	lo_statics[0].bpf_callback = 0;
	448	lo_statics[0].bpf_mode = BPF_TAP_DISABLE;
	449
	450	bzero(&lo_init, sizeof(lo_init));
	451	lo_init.name = "lo";
	452	lo_init.unit = 0;
	453	lo_init.family = IFNET_FAMILY_LOOPBACK;
	454	lo_init.type = IFT_LOOP;
	455	lo_init.output = lo_output;
	456	lo_init.demux = lo_demux;
	457	lo_init.add_proto = lo_add_proto;
	458	lo_init.del_proto = lo_del_proto;
	459	lo_init.framer = lo_framer;
	460	lo_init.softc = &lo_statics[0];
	461	lo_init.ioctl = loioctl;
	462	lo_init.set_bpf_tap = lo_set_bpf_tap;
	463	result = ifnet_allocate(&lo_init, &lo_ifp);
	464	if (result != 0) {
	465	printf("ifnet_allocate for lo0 failed - %d\n", result);
	466	return;
	467	}
	468
	469	ifnet_set_mtu(lo_ifp, LOMTU);
	470	ifnet_set_flags(lo_ifp, IFF_LOOPBACK \| IFF_MULTICAST, IFF_LOOPBACK \| IFF_MULTICAST);
	471	ifnet_set_offload(lo_ifp, IFNET_CSUM_IP \| IFNET_CSUM_TCP \| IFNET_CSUM_UDP \| IFNET_CSUM_FRAGMENT \| IFNET_IP_FRAGMENT \| IFNET_MULTIPAGES);
	472	ifnet_set_hdrlen(lo_ifp, sizeof(struct loopback_header));
	473	ifnet_set_eflags(lo_ifp, IFEF_SENDLIST, IFEF_SENDLIST);
	474
	475	#if CONFIG_MACF_NET
	476	mac_ifnet_label_init(ifp);
1c79356b	477	#endif
2d21ac55 A	478
	479	result = ifnet_attach(lo_ifp, NULL);
	480	if (result != 0) {
	481	printf("ifnet_attach lo0 failed - %d\n", result);
	482	return;
1c79356b	483	}
2d21ac55 A	484	bpfattach(lo_ifp, DLT_NULL, sizeof(u_int));
2d21ac55 A	485
91447636	486	loopattach_done = 1;
1c79356b	487	}