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

/*
 * Copyright (c) 2000 Apple Computer, 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 $
 */

/*
 * 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 IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#endif

#if INET6
#ifndef 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

#define NLOOP_ATTACHMENTS (NLOOP * 12)

struct lo_statics_str {
	int				bpf_mode;
	bpf_packet_func	bpf_callback;
};

void loopattach(void *dummy);

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

struct	ifnet loif[NLOOP];
struct ifnet *lo_ifp = &loif[0];

struct	loopback_header {
	u_long		protocol;
};

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 struct ifnet			*ifp,
	__unused u_long					protocol_family,
	__unused struct ddesc_head_str	*demux_desc_head)
{
    return 0;
}


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

static int
lo_output(
	struct ifnet *ifp,
	struct mbuf *m)
{

	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 *);
	m->m_pkthdr.csum_data = 0xffff; /* loopback checksums are always OK */
	m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_PSEUDO_HDR | 
							 CSUM_IP_CHECKED | CSUM_IP_VALID;
	m_adj(m, sizeof(struct loopback_header));

#if NBPFILTER > 0
	if (lo_statics[ifp->if_unit].bpf_mode != BPF_TAP_DISABLE) {
		struct mbuf m0, *n;

		n = m;
		if (ifp->if_bpf->bif_dlt == DLT_NULL) {
			struct loopback_header  *header;
			/*
			 * We need to prepend the address family as
			 * a four byte field.  Cons up a dummy 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).
			 */
			header = (struct loopback_header*)m->m_pkthdr.header;
			m0.m_next = m;
			m0.m_len = 4;
			m0.m_data = (char *)&header->protocol;
			n = &m0;
		}

		lo_statics[ifp->if_unit].bpf_callback(ifp, n);
	}
#endif

	return dlil_input(ifp, m, m);
}


/*
 * 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 int
lo_pre_output(
	__unused struct ifnet	*ifp,
	u_long			protocol_family,
	struct mbuf		**m,
	__unused const struct sockaddr	*dst,
	caddr_t			route,
	char			*frame_type,
	__unused char	*dst_addr)

{
	register struct rtentry *rt = (struct rtentry *) route;

	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);
	}
	
	*(u_long *)frame_type = protocol_family;

	return 0;
}

/*
 *  lo_input - This should work for all attached protocols that use the
 *             ifq/schednetisr input mechanism.
 */
static int
lo_input(
	struct mbuf				*m,
	__unused char			*fh,
	__unused struct ifnet	*ifp,
	__unused u_long			protocol_family,
	__unused int			sync_ok)
{
	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 int  lo_attach_proto(struct ifnet *ifp, u_long protocol_family)
{
	struct dlil_proto_reg_str   reg;
	int   stat =0 ;
	
	bzero(&reg, sizeof(reg));
	TAILQ_INIT(&reg.demux_desc_head);
	reg.interface_family = ifp->if_family;
	reg.unit_number      = ifp->if_unit;
	reg.input			 = lo_input;
	reg.pre_output       = lo_pre_output;
	reg.protocol_family  = protocol_family;
	
	stat = dlil_attach_protocol(&reg);

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

void lo_reg_if_mods()
{
     int error;

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

	if ((error = dlil_reg_proto_module(PF_INET6, APPLE_IF_FAM_LOOPBACK, lo_attach_proto, NULL)) != 0)
		printf("dlil_reg_proto_module 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(
	__unused void *dummy)
{
	struct ifnet *ifp;
	int i = 0;

	lo_reg_if_mods();

	for (ifp = loif; i < NLOOP; ifp++) {
		lo_statics[i].bpf_callback = 0;
		lo_statics[i].bpf_mode      = BPF_TAP_DISABLE;
		bzero(ifp, sizeof(struct ifnet));
		ifp->if_name = "lo";
		ifp->if_family = APPLE_IF_FAM_LOOPBACK;
		ifp->if_unit = i++;
		ifp->if_mtu = LOMTU;
		ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
		ifp->if_ioctl = loioctl;
		ifp->if_demux = lo_demux;
		ifp->if_framer = lo_framer;
		ifp->if_add_proto = lo_add_proto;
		ifp->if_del_proto = lo_del_proto;
		ifp->if_set_bpf_tap = lo_set_bpf_tap;
		ifp->if_output = lo_output;
		ifp->if_type = IFT_LOOP;
		ifp->if_hwassist = IF_HWASSIST_CSUM_IP | IF_HWASSIST_CSUM_TCP | IF_HWASSIST_CSUM_UDP;
		ifp->if_hdrlen = sizeof(struct loopback_header);
		lo_ifp = ifp;
		dlil_if_attach(ifp);
#if NBPFILTER > 0
		bpfattach(ifp, DLT_NULL, sizeof(u_int));
#endif
	}
	loopattach_done = 1;
}
Commit	Line	Data
1c79356b	1	/*
5d5c5d0d A	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 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.
	14	*
	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
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	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 A	62	*/
	63
	64	/*
	65	* Loopback interface driver for protocol testing and timing.
	66	*/
	67	#include "loop.h"
	68	#if NLOOP > 0
	69
	70	#include <sys/param.h>
	71	#include <sys/systm.h>
	72	#include <sys/kernel.h>
	73	#include <sys/mbuf.h>
	74	#include <sys/socket.h>
	75	#include <sys/sockio.h>
	76
	77	#include <net/if.h>
	78	#include <net/if_types.h>
1c79356b A	79	#include <net/route.h>
	80	#include <net/bpf.h>
	81	#include <sys/malloc.h>
	82
	83	#if INET
	84	#include <netinet/in.h>
	85	#include <netinet/in_var.h>
	86	#endif
	87
	88	#if IPX
	89	#include <netipx/ipx.h>
	90	#include <netipx/ipx_if.h>
	91	#endif
	92
	93	#if INET6
	94	#ifndef INET
	95	#include <netinet/in.h>
	96	#endif
	97	#include <netinet6/in6_var.h>
	98	#include <netinet/ip6.h>
	99	#endif
	100
1c79356b	101	#include <net/dlil.h>
91447636	102	#include <net/kpi_protocol.h>
1c79356b A	103
	104	#if NETAT
	105	extern struct ifqueue atalkintrq;
	106	#endif
	107
	108	#include "bpfilter.h"
	109	#if NBPFILTER > 0
	110	#include <net/bpfdesc.h>
	111	#endif
	112
	113	#define NLOOP_ATTACHMENTS (NLOOP * 12)
	114
	115	struct lo_statics_str {
91447636 A	116	int bpf_mode;
91447636 A	117	bpf_packet_func bpf_callback;
1c79356b A	118	};
1c79356b A	119
91447636	120	void loopattach(void *dummy);
1c79356b	121
91447636 A	122	static struct lo_statics_str lo_statics[NLOOP];
91447636 A	123	int loopattach_done = 0; /* used to sync ip6_init2 loopback configuration */
1c79356b A	124
	125	#ifdef TINY_LOMTU
	126	#define LOMTU (1024+512)
	127	#else
	128	#define LOMTU 16384
	129	#endif
	130
	131	struct ifnet loif[NLOOP];
91447636	132	struct ifnet *lo_ifp = &loif[0];
1c79356b	133
91447636 A	134	struct loopback_header {
	135	u_long protocol;
	136	};
1c79356b	137
91447636	138	void lo_reg_if_mods(void);
1c79356b	139
91447636	140	/* Local forward declerations */
1c79356b	141
91447636 A	142	static errno_t
	143	lo_demux(
	144	__unused ifnet_t ifp,
	145	__unused mbuf_t m,
	146	char *frame_header,
	147	protocol_family_t *protocol_family)
1c79356b	148	{
91447636 A	149	struct loopback_header header = (struct loopback_header )frame_header;
	150
	151	*protocol_family = header->protocol;
	152
	153	return 0;
1c79356b A	154	}
	155
	156
91447636 A	157	static errno_t
	158	lo_framer(
	159	__unused ifnet_t ifp,
	160	mbuf_t *m,
	161	__unused const struct sockaddr *dest,
	162	__unused const char *dest_linkaddr,
	163	const char *frame_type)
1c79356b	164	{
91447636	165	struct loopback_header *header;
1c79356b	166
91447636 A	167	M_PREPEND(*m, sizeof(struct loopback_header), M_WAITOK);
	168	header = mtod(m, struct loopback_header);
	169	header->protocol = (const u_long)frame_type;
1c79356b A	170	return 0;
	171	}
	172
91447636 A	173	static errno_t
	174	lo_add_proto(
	175	__unused struct ifnet *ifp,
	176	__unused u_long protocol_family,
	177	__unused struct ddesc_head_str *demux_desc_head)
1c79356b A	178	{
	179	return 0;
	180	}
	181
	182
91447636 A	183	static errno_t
	184	lo_del_proto(
	185	__unused ifnet_t ifp,
	186	__unused protocol_family_t protocol)
1c79356b	187	{
91447636	188	return 0;
1c79356b A	189	}
	190
	191	static int
91447636 A	192	lo_output(
	193	struct ifnet *ifp,
	194	struct mbuf *m)
	195	{
1c79356b A	196
	197	if ((m->m_flags & M_PKTHDR) == 0)
	198	panic("lo_output: no HDR");
	199
	200	/*
	201	* Don't overwrite the rcvif field if it is in use.
	202	* This is used to match multicast packets, sent looping
	203	* back, with the appropriate group record on input.
	204	*/
	205	if (m->m_pkthdr.rcvif == NULL)
	206	m->m_pkthdr.rcvif = ifp;
1c79356b	207
91447636 A	208	ifp->if_ibytes += m->m_pkthdr.len;
	209	ifp->if_obytes += m->m_pkthdr.len;
	210
	211	ifp->if_opackets++;
	212	ifp->if_ipackets++;
	213
	214	m->m_pkthdr.header = mtod(m, char *);
	215	m->m_pkthdr.csum_data = 0xffff; /* loopback checksums are always OK */
	216	m->m_pkthdr.csum_flags = CSUM_DATA_VALID \| CSUM_PSEUDO_HDR \|
	217	CSUM_IP_CHECKED \| CSUM_IP_VALID;
	218	m_adj(m, sizeof(struct loopback_header));
1c79356b A	219
	220	#if NBPFILTER > 0
	221	if (lo_statics[ifp->if_unit].bpf_mode != BPF_TAP_DISABLE) {
	222	struct mbuf m0, *n;
	223
1c79356b A	224	n = m;
1c79356b A	225	if (ifp->if_bpf->bif_dlt == DLT_NULL) {
91447636	226	struct loopback_header *header;
1c79356b A	227	/*
	228	* We need to prepend the address family as
	229	* a four byte field. Cons up a dummy header
	230	* to pacify bpf. This is safe because bpf
	231	* will only read from the mbuf (i.e., it won't
	232	* try to free it or keep a pointer a to it).
	233	*/
91447636	234	header = (struct loopback_header*)m->m_pkthdr.header;
1c79356b A	235	m0.m_next = m;
1c79356b A	236	m0.m_len = 4;
91447636	237	m0.m_data = (char *)&header->protocol;
1c79356b A	238	n = &m0;
	239	}
	240
91447636	241	lo_statics[ifp->if_unit].bpf_callback(ifp, n);
1c79356b A	242	}
	243	#endif
	244
1c79356b A	245	return dlil_input(ifp, m, m);
	246	}
	247
	248
	249	/*
91447636	250	* This is a common pre-output route used by INET and INET6. This could
1c79356b A	251	* (should?) be split into separate pre-output routines for each protocol.
	252	*/
	253
	254	static int
91447636 A	255	lo_pre_output(
	256	__unused struct ifnet *ifp,
	257	u_long protocol_family,
	258	struct mbuf **m,
	259	__unused const struct sockaddr *dst,
	260	caddr_t route,
	261	char *frame_type,
	262	__unused char *dst_addr)
1c79356b A	263
1c79356b A	264	{
1c79356b A	265	register struct rtentry rt = (struct rtentry ) route;
1c79356b A	266
1c79356b A	267	if (((*m)->m_flags & M_PKTHDR) == 0)
	268	panic("looutput no HDR");
	269
	270	if (rt && rt->rt_flags & (RTF_REJECT\|RTF_BLACKHOLE)) {
91447636 A	271	if (rt->rt_flags & RTF_BLACKHOLE) {
	272	m_freem(*m);
	273	return EJUSTRETURN;
	274	}
	275	else
	276	return ((rt->rt_flags & RTF_HOST) ? EHOSTUNREACH : ENETUNREACH);
1c79356b	277	}
91447636 A	278
91447636 A	279	(u_long )frame_type = protocol_family;
1c79356b A	280
	281	return 0;
	282	}
	283
1c79356b A	284	/*
	285	* lo_input - This should work for all attached protocols that use the
	286	* ifq/schednetisr input mechanism.
	287	*/
91447636 A	288	static int
	289	lo_input(
	290	struct mbuf *m,
	291	__unused char *fh,
	292	__unused struct ifnet *ifp,
	293	__unused u_long protocol_family,
	294	__unused int sync_ok)
1c79356b	295	{
91447636	296	if (proto_input(protocol_family, m) != 0)
1c79356b	297	m_freem(m);
1c79356b A	298	return (0);
	299	}
	300
	301
	302
	303
	304	/* ARGSUSED */
	305	static void
91447636 A	306	lortrequest(
	307	__unused int cmd,
	308	struct rtentry *rt,
	309	__unused struct sockaddr *sa)
1c79356b A	310	{
	311	if (rt) {
	312	rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
	313	/*
	314	* For optimal performance, the send and receive buffers
	315	* should be at least twice the MTU plus a little more for
	316	* overhead.
	317	*/
	318	rt->rt_rmx.rmx_recvpipe =
	319	rt->rt_rmx.rmx_sendpipe = 3 * LOMTU;
	320	}
	321	}
	322
	323	/*
	324	* Process an ioctl request.
	325	*/
91447636 A	326	static errno_t
	327	loioctl(
	328	ifnet_t ifp,
	329	u_int32_t cmd,
	330	void* data)
1c79356b A	331	{
	332	register struct ifaddr *ifa;
	333	register struct ifreq ifr = (struct ifreq )data;
	334	register int error = 0;
	335
	336	switch (cmd) {
	337
	338	case SIOCSIFADDR:
91447636	339	ifnet_set_flags(ifp, IFF_UP \| IFF_RUNNING, IFF_UP \| IFF_RUNNING);
1c79356b A	340	ifa = (struct ifaddr *)data;
	341	ifa->ifa_rtrequest = lortrequest;
	342	/*
	343	* Everything else is done at a higher level.
	344	*/
	345	break;
	346
	347	case SIOCADDMULTI:
	348	case SIOCDELMULTI:
	349	if (ifr == 0) {
	350	error = EAFNOSUPPORT; /* XXX */
	351	break;
	352	}
	353	switch (ifr->ifr_addr.sa_family) {
	354
	355	#if INET
	356	case AF_INET:
	357	break;
	358	#endif
	359	#if INET6
	360	case AF_INET6:
	361	break;
	362	#endif
	363
	364	default:
	365	error = EAFNOSUPPORT;
	366	break;
	367	}
	368	break;
	369
	370	case SIOCSIFMTU:
	371	ifp->if_mtu = ifr->ifr_mtu;
	372	break;
	373
	374	case SIOCSIFFLAGS:
	375	break;
	376
	377	default:
	378	error = EOPNOTSUPP;
4a249263	379	break;
1c79356b A	380	}
	381	return (error);
	382	}
	383	#endif /* NLOOP > 0 */
	384
	385
91447636	386	static int lo_attach_proto(struct ifnet *ifp, u_long protocol_family)
1c79356b	387	{
91447636 A	388	struct dlil_proto_reg_str reg;
	389	int stat =0 ;
	390
	391	bzero(&reg, sizeof(reg));
	392	TAILQ_INIT(&reg.demux_desc_head);
	393	reg.interface_family = ifp->if_family;
	394	reg.unit_number = ifp->if_unit;
	395	reg.input = lo_input;
	396	reg.pre_output = lo_pre_output;
	397	reg.protocol_family = protocol_family;
	398
	399	stat = dlil_attach_protocol(&reg);
1c79356b	400
91447636 A	401	if (stat && stat != EEXIST) {
	402	printf("lo_attach_proto: dlil_attach_protocol for %d returned=%d\n",
	403	protocol_family, stat);
9bccf70c	404	}
91447636 A	405
91447636 A	406	return stat;
9bccf70c A	407	}
9bccf70c A	408
55e303ae A	409	void lo_reg_if_mods()
55e303ae A	410	{
55e303ae A	411	int error;
55e303ae A	412
55e303ae	413	/* Register protocol registration functions */
91447636	414	if ((error = dlil_reg_proto_module(PF_INET, APPLE_IF_FAM_LOOPBACK, lo_attach_proto, NULL)) != 0)
55e303ae A	415	printf("dlil_reg_proto_module failed for AF_INET error=%d\n", error);
55e303ae A	416
91447636	417	if ((error = dlil_reg_proto_module(PF_INET6, APPLE_IF_FAM_LOOPBACK, lo_attach_proto, NULL)) != 0)
55e303ae	418	printf("dlil_reg_proto_module failed for AF_INET6 error=%d\n", error);
55e303ae	419	}
1c79356b	420
91447636 A	421	static errno_t
	422	lo_set_bpf_tap(
	423	ifnet_t ifp,
	424	bpf_tap_mode mode,
	425	bpf_packet_func bpf_callback)
1c79356b A	426	{
	427
	428	/*
	429	* NEED MUTEX HERE XXX
	430	*/
	431	if (mode == BPF_TAP_DISABLE) {
	432	lo_statics[ifp->if_unit].bpf_mode = mode;
	433	lo_statics[ifp->if_unit].bpf_callback = bpf_callback;
	434	}
	435	else {
	436	lo_statics[ifp->if_unit].bpf_callback = bpf_callback;
	437	lo_statics[ifp->if_unit].bpf_mode = mode;
	438	}
	439
	440	return 0;
	441	}
	442
	443
	444	/* ARGSUSED */
	445	void
91447636 A	446	loopattach(
91447636 A	447	__unused void *dummy)
1c79356b	448	{
91447636 A	449	struct ifnet *ifp;
91447636 A	450	int i = 0;
1c79356b	451
1c79356b A	452	lo_reg_if_mods();
	453
	454	for (ifp = loif; i < NLOOP; ifp++) {
	455	lo_statics[i].bpf_callback = 0;
	456	lo_statics[i].bpf_mode = BPF_TAP_DISABLE;
91447636	457	bzero(ifp, sizeof(struct ifnet));
1c79356b A	458	ifp->if_name = "lo";
	459	ifp->if_family = APPLE_IF_FAM_LOOPBACK;
	460	ifp->if_unit = i++;
	461	ifp->if_mtu = LOMTU;
	462	ifp->if_flags = IFF_LOOPBACK \| IFF_MULTICAST;
91447636 A	463	ifp->if_ioctl = loioctl;
	464	ifp->if_demux = lo_demux;
	465	ifp->if_framer = lo_framer;
	466	ifp->if_add_proto = lo_add_proto;
	467	ifp->if_del_proto = lo_del_proto;
1c79356b A	468	ifp->if_set_bpf_tap = lo_set_bpf_tap;
	469	ifp->if_output = lo_output;
	470	ifp->if_type = IFT_LOOP;
91447636 A	471	ifp->if_hwassist = IF_HWASSIST_CSUM_IP \| IF_HWASSIST_CSUM_TCP \| IF_HWASSIST_CSUM_UDP;
	472	ifp->if_hdrlen = sizeof(struct loopback_header);
	473	lo_ifp = ifp;
1c79356b A	474	dlil_if_attach(ifp);
	475	#if NBPFILTER > 0
	476	bpfattach(ifp, DLT_NULL, sizeof(u_int));
	477	#endif
	478	}
91447636	479	loopattach_done = 1;
1c79356b	480	}