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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_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 A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
37839358 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
37839358 A	12	* This Original Code and all software distributed under the License are
37839358 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
37839358 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1982, 1986, 1993
	24	* The Regents of the University of California. All rights reserved.
	25	*
	26	* Redistribution and use in source and binary forms, with or without
	27	* modification, are permitted provided that the following conditions
	28	* are met:
	29	* 1. Redistributions of source code must retain the above copyright
	30	* notice, this list of conditions and the following disclaimer.
	31	* 2. Redistributions in binary form must reproduce the above copyright
	32	* notice, this list of conditions and the following disclaimer in the
	33	* documentation and/or other materials provided with the distribution.
	34	* 3. All advertising materials mentioning features or use of this software
	35	* must display the following acknowledgement:
	36	* This product includes software developed by the University of
	37	* California, Berkeley and its contributors.
	38	* 4. Neither the name of the University nor the names of its contributors
	39	* may be used to endorse or promote products derived from this software
	40	* without specific prior written permission.
	41	*
	42	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	43	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	44	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	45	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	46	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	47	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	48	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	49	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	50	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	51	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	52	* SUCH DAMAGE.
	53	*
	54	* @(#)if_loop.c 8.1 (Berkeley) 6/10/93
9bccf70c	55	* $FreeBSD: src/sys/net/if_loop.c,v 1.47.2.5 2001/07/03 11:01:41 ume Exp $
1c79356b A	56	*/
	57
	58	/*
	59	* Loopback interface driver for protocol testing and timing.
	60	*/
	61	#include "loop.h"
	62	#if NLOOP > 0
	63
	64	#include <sys/param.h>
	65	#include <sys/systm.h>
	66	#include <sys/kernel.h>
	67	#include <sys/mbuf.h>
	68	#include <sys/socket.h>
	69	#include <sys/sockio.h>
	70
	71	#include <net/if.h>
	72	#include <net/if_types.h>
1c79356b A	73	#include <net/route.h>
	74	#include <net/bpf.h>
	75	#include <sys/malloc.h>
	76
	77	#if INET
	78	#include <netinet/in.h>
	79	#include <netinet/in_var.h>
	80	#endif
	81
	82	#if IPX
	83	#include <netipx/ipx.h>
	84	#include <netipx/ipx_if.h>
	85	#endif
	86
	87	#if INET6
	88	#ifndef INET
	89	#include <netinet/in.h>
	90	#endif
	91	#include <netinet6/in6_var.h>
	92	#include <netinet/ip6.h>
	93	#endif
	94
1c79356b	95	#include <net/dlil.h>
91447636	96	#include <net/kpi_protocol.h>
1c79356b A	97
	98	#if NETAT
	99	extern struct ifqueue atalkintrq;
	100	#endif
	101
	102	#include "bpfilter.h"
	103	#if NBPFILTER > 0
	104	#include <net/bpfdesc.h>
	105	#endif
	106
	107	#define NLOOP_ATTACHMENTS (NLOOP * 12)
	108
	109	struct lo_statics_str {
91447636 A	110	int bpf_mode;
91447636 A	111	bpf_packet_func bpf_callback;
1c79356b A	112	};
1c79356b A	113
91447636	114	void loopattach(void *dummy);
1c79356b	115
91447636 A	116	static struct lo_statics_str lo_statics[NLOOP];
91447636 A	117	int loopattach_done = 0; /* used to sync ip6_init2 loopback configuration */
1c79356b A	118
	119	#ifdef TINY_LOMTU
	120	#define LOMTU (1024+512)
	121	#else
	122	#define LOMTU 16384
	123	#endif
	124
	125	struct ifnet loif[NLOOP];
91447636	126	struct ifnet *lo_ifp = &loif[0];
1c79356b	127
91447636 A	128	struct loopback_header {
	129	u_long protocol;
	130	};
1c79356b	131
91447636	132	void lo_reg_if_mods(void);
1c79356b	133
91447636	134	/* Local forward declerations */
1c79356b	135
91447636 A	136	static errno_t
	137	lo_demux(
	138	__unused ifnet_t ifp,
	139	__unused mbuf_t m,
	140	char *frame_header,
	141	protocol_family_t *protocol_family)
1c79356b	142	{
91447636 A	143	struct loopback_header header = (struct loopback_header )frame_header;
	144
	145	*protocol_family = header->protocol;
	146
	147	return 0;
1c79356b A	148	}
	149
	150
91447636 A	151	static errno_t
	152	lo_framer(
	153	__unused ifnet_t ifp,
	154	mbuf_t *m,
	155	__unused const struct sockaddr *dest,
	156	__unused const char *dest_linkaddr,
	157	const char *frame_type)
1c79356b	158	{
91447636	159	struct loopback_header *header;
1c79356b	160
91447636 A	161	M_PREPEND(*m, sizeof(struct loopback_header), M_WAITOK);
	162	header = mtod(m, struct loopback_header);
	163	header->protocol = (const u_long)frame_type;
1c79356b A	164	return 0;
	165	}
	166
91447636 A	167	static errno_t
	168	lo_add_proto(
	169	__unused struct ifnet *ifp,
	170	__unused u_long protocol_family,
	171	__unused struct ddesc_head_str *demux_desc_head)
1c79356b A	172	{
	173	return 0;
	174	}
	175
	176
91447636 A	177	static errno_t
	178	lo_del_proto(
	179	__unused ifnet_t ifp,
	180	__unused protocol_family_t protocol)
1c79356b	181	{
91447636	182	return 0;
1c79356b A	183	}
	184
	185	static int
91447636 A	186	lo_output(
	187	struct ifnet *ifp,
	188	struct mbuf *m)
	189	{
1c79356b A	190
	191	if ((m->m_flags & M_PKTHDR) == 0)
	192	panic("lo_output: no HDR");
	193
	194	/*
	195	* Don't overwrite the rcvif field if it is in use.
	196	* This is used to match multicast packets, sent looping
	197	* back, with the appropriate group record on input.
	198	*/
	199	if (m->m_pkthdr.rcvif == NULL)
	200	m->m_pkthdr.rcvif = ifp;
1c79356b	201
91447636 A	202	ifp->if_ibytes += m->m_pkthdr.len;
	203	ifp->if_obytes += m->m_pkthdr.len;
	204
	205	ifp->if_opackets++;
	206	ifp->if_ipackets++;
	207
	208	m->m_pkthdr.header = mtod(m, char *);
	209	m->m_pkthdr.csum_data = 0xffff; /* loopback checksums are always OK */
	210	m->m_pkthdr.csum_flags = CSUM_DATA_VALID \| CSUM_PSEUDO_HDR \|
	211	CSUM_IP_CHECKED \| CSUM_IP_VALID;
	212	m_adj(m, sizeof(struct loopback_header));
1c79356b A	213
	214	#if NBPFILTER > 0
	215	if (lo_statics[ifp->if_unit].bpf_mode != BPF_TAP_DISABLE) {
	216	struct mbuf m0, *n;
	217
1c79356b A	218	n = m;
1c79356b A	219	if (ifp->if_bpf->bif_dlt == DLT_NULL) {
91447636	220	struct loopback_header *header;
1c79356b A	221	/*
	222	* We need to prepend the address family as
	223	* a four byte field. Cons up a dummy header
	224	* to pacify bpf. This is safe because bpf
	225	* will only read from the mbuf (i.e., it won't
	226	* try to free it or keep a pointer a to it).
	227	*/
91447636	228	header = (struct loopback_header*)m->m_pkthdr.header;
1c79356b A	229	m0.m_next = m;
1c79356b A	230	m0.m_len = 4;
91447636	231	m0.m_data = (char *)&header->protocol;
1c79356b A	232	n = &m0;
	233	}
	234
91447636	235	lo_statics[ifp->if_unit].bpf_callback(ifp, n);
1c79356b A	236	}
	237	#endif
	238
1c79356b A	239	return dlil_input(ifp, m, m);
	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
	248	static int
91447636 A	249	lo_pre_output(
	250	__unused struct ifnet *ifp,
	251	u_long protocol_family,
	252	struct mbuf **m,
	253	__unused const struct sockaddr *dst,
	254	caddr_t route,
	255	char *frame_type,
	256	__unused char *dst_addr)
1c79356b A	257
1c79356b A	258	{
1c79356b A	259	register struct rtentry rt = (struct rtentry ) route;
1c79356b A	260
1c79356b A	261	if (((*m)->m_flags & M_PKTHDR) == 0)
	262	panic("looutput no HDR");
	263
	264	if (rt && rt->rt_flags & (RTF_REJECT\|RTF_BLACKHOLE)) {
91447636 A	265	if (rt->rt_flags & RTF_BLACKHOLE) {
	266	m_freem(*m);
	267	return EJUSTRETURN;
	268	}
	269	else
	270	return ((rt->rt_flags & RTF_HOST) ? EHOSTUNREACH : ENETUNREACH);
1c79356b	271	}
91447636 A	272
91447636 A	273	(u_long )frame_type = protocol_family;
1c79356b A	274
	275	return 0;
	276	}
	277
1c79356b A	278	/*
	279	* lo_input - This should work for all attached protocols that use the
	280	* ifq/schednetisr input mechanism.
	281	*/
91447636 A	282	static int
	283	lo_input(
	284	struct mbuf *m,
	285	__unused char *fh,
	286	__unused struct ifnet *ifp,
	287	__unused u_long protocol_family,
	288	__unused int sync_ok)
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
91447636	380	static int lo_attach_proto(struct ifnet *ifp, u_long protocol_family)
1c79356b	381	{
91447636 A	382	struct dlil_proto_reg_str reg;
	383	int stat =0 ;
	384
	385	bzero(&reg, sizeof(reg));
	386	TAILQ_INIT(&reg.demux_desc_head);
	387	reg.interface_family = ifp->if_family;
	388	reg.unit_number = ifp->if_unit;
	389	reg.input = lo_input;
	390	reg.pre_output = lo_pre_output;
	391	reg.protocol_family = protocol_family;
	392
	393	stat = dlil_attach_protocol(&reg);
1c79356b	394
91447636 A	395	if (stat && stat != EEXIST) {
	396	printf("lo_attach_proto: dlil_attach_protocol for %d returned=%d\n",
	397	protocol_family, stat);
9bccf70c	398	}
91447636 A	399
91447636 A	400	return stat;
9bccf70c A	401	}
9bccf70c A	402
55e303ae A	403	void lo_reg_if_mods()
55e303ae A	404	{
55e303ae A	405	int error;
55e303ae A	406
55e303ae	407	/* Register protocol registration functions */
91447636	408	if ((error = dlil_reg_proto_module(PF_INET, APPLE_IF_FAM_LOOPBACK, lo_attach_proto, NULL)) != 0)
55e303ae A	409	printf("dlil_reg_proto_module failed for AF_INET error=%d\n", error);
55e303ae A	410
91447636	411	if ((error = dlil_reg_proto_module(PF_INET6, APPLE_IF_FAM_LOOPBACK, lo_attach_proto, NULL)) != 0)
55e303ae	412	printf("dlil_reg_proto_module failed for AF_INET6 error=%d\n", error);
55e303ae	413	}
1c79356b	414
91447636 A	415	static errno_t
	416	lo_set_bpf_tap(
	417	ifnet_t ifp,
	418	bpf_tap_mode mode,
	419	bpf_packet_func bpf_callback)
1c79356b A	420	{
	421
	422	/*
	423	* NEED MUTEX HERE XXX
	424	*/
	425	if (mode == BPF_TAP_DISABLE) {
	426	lo_statics[ifp->if_unit].bpf_mode = mode;
	427	lo_statics[ifp->if_unit].bpf_callback = bpf_callback;
	428	}
	429	else {
	430	lo_statics[ifp->if_unit].bpf_callback = bpf_callback;
	431	lo_statics[ifp->if_unit].bpf_mode = mode;
	432	}
	433
	434	return 0;
	435	}
	436
	437
	438	/* ARGSUSED */
	439	void
91447636 A	440	loopattach(
91447636 A	441	__unused void *dummy)
1c79356b	442	{
91447636 A	443	struct ifnet *ifp;
91447636 A	444	int i = 0;
1c79356b	445
1c79356b A	446	lo_reg_if_mods();
	447
	448	for (ifp = loif; i < NLOOP; ifp++) {
	449	lo_statics[i].bpf_callback = 0;
	450	lo_statics[i].bpf_mode = BPF_TAP_DISABLE;
91447636	451	bzero(ifp, sizeof(struct ifnet));
1c79356b A	452	ifp->if_name = "lo";
	453	ifp->if_family = APPLE_IF_FAM_LOOPBACK;
	454	ifp->if_unit = i++;
	455	ifp->if_mtu = LOMTU;
	456	ifp->if_flags = IFF_LOOPBACK \| IFF_MULTICAST;
91447636 A	457	ifp->if_ioctl = loioctl;
	458	ifp->if_demux = lo_demux;
	459	ifp->if_framer = lo_framer;
	460	ifp->if_add_proto = lo_add_proto;
	461	ifp->if_del_proto = lo_del_proto;
1c79356b A	462	ifp->if_set_bpf_tap = lo_set_bpf_tap;
	463	ifp->if_output = lo_output;
	464	ifp->if_type = IFT_LOOP;
91447636 A	465	ifp->if_hwassist = IF_HWASSIST_CSUM_IP \| IF_HWASSIST_CSUM_TCP \| IF_HWASSIST_CSUM_UDP;
	466	ifp->if_hdrlen = sizeof(struct loopback_header);
	467	lo_ifp = ifp;
1c79356b A	468	dlil_if_attach(ifp);
	469	#if NBPFILTER > 0
	470	bpfattach(ifp, DLT_NULL, sizeof(u_int));
	471	#endif
	472	}
91447636	473	loopattach_done = 1;
1c79356b	474	}