xref: /xnu-12377.41.6/bsd/net/ndrv.h (revision bbb1b6f9e71b8cdde6e5cd6f4841f207dee3d828)

/*
 * Copyright (c) 2008 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) 1997, 1998 Apple Computer, Inc. All Rights Reserved */
/*
 *	@(#)ndrv.h	1.1 (MacOSX) 6/10/43
 * Justin Walker - 970604
 */
#include <net/dlil.h>

#ifndef _NET_NDRV_H
#define _NET_NDRV_H
#include <net/if_var.h>
#include <sys/appleapiopts.h>
#include <sys/types.h>


struct sockaddr_ndrv {
	unsigned char snd_len;
	unsigned char snd_family;
	unsigned char snd_name[IFNAMSIZ]; /* from if.h */
};

/*
 * Support for user-mode protocol handlers
 */

#define NDRV_DEMUXTYPE_ETHERTYPE        4
#define NDRV_DEMUXTYPE_SAP                      5
#define NDRV_DEMUXTYPE_SNAP                     6

#define NDRVPROTO_NDRV                          0

/*
 * Struct: ndrv_demux_desc
 * Purpose:
 *   To uniquely identify a packet based on its low-level framing information.
 *
 * Fields:
 *		type		:	type of protocol in data field, must be understood by
 *						the interface family of the interface the socket is bound to
 *		length		:       length of protocol data in "data" field
 *		data		:	union of framing-specific data, in network byte order
 *		ether_type	:	ethernet type in network byte order, assuming
 *						ethernet type II framing
 *		sap			:	first 3 bytes of sap header, network byte order
 *		snap		:	first 5 bytes of snap header, network byte order
 *		other		:	up to 28 bytes of protocol data for different protocol type
 *
 * Examples:
 * 1) 802.1x uses ether_type 0x888e, so the descriptor would be set as:
 *    struct ndrv_demux_desc desc;
 *    desc.type = NDRV_DEMUXTYPE_ETHERTYPE
 *	  desc.length = sizeof(unsigned short);
 *    desc.ether_type = htons(0x888e);
 * 2) AppleTalk uses SNAP 0x080007809B
 *    struct ndrv_demux_desc desc;
 *    desc.type = NDRV_DEMUXTYPE_SNAP;
 *    desc.length = 5;
 *    desc.data.snap[0] = 08;
 *    desc.data.snap[1] = 00;
 *    desc.data.snap[2] = 07;
 *    desc.data.snap[3] = 80;
 *    desc.data.snap[4] = 9B;
 */
struct ndrv_demux_desc {
	u_int16_t   type;
	u_int16_t   length;
	union{
		u_int16_t       ether_type;
		u_int8_t        sap[3];
		u_int8_t        snap[5];
		u_int8_t        other[28];
	} data;
};

#define NDRV_PROTOCOL_DESC_VERS 1

/*
 * Struct: ndrv_protocol_desc
 * Purpose:
 *   Used to "bind" an NDRV socket so that packets that match
 *   given protocol demux descriptions can be received:
 * Field:
 *	version		:	must be NDRV_PROTOCOL_DESC_VERS
 *	protocol_family	:	unique identifier for this protocol
 *	demux_count	:	number of demux_list descriptors in demux_list; maximum of 10
 *	demux_list	:	pointer to array of demux descriptors
 */
#ifdef BSD_KERNEL_PRIVATE
struct ndrv_protocol_desc_kernel {
	u_int32_t                           version;
	u_int32_t                           protocol_family;
	u_int32_t                           demux_count;
	struct ndrv_demux_desc              *__counted_by(demux_count) demux_list;
};
#else
struct ndrv_protocol_desc {
	u_int32_t                           version;
	u_int32_t                           protocol_family;
	u_int32_t                           demux_count;
	struct ndrv_demux_desc              *demux_list;
};
#endif


#ifdef KERNEL_PRIVATE
/* LP64 version of ndrv_protocol_desc.  all pointers
 * grow when we're dealing with a 64-bit process.
 * WARNING - keep in sync with ndrv_protocol_desc
 */
struct ndrv_protocol_desc64 {
	u_int32_t                           version;
	u_int32_t                           protocol_family;
	u_int32_t                           demux_count;
	user64_addr_t                       demux_list __attribute__((aligned(8)));
};

struct ndrv_protocol_desc32 {
	u_int32_t                           version;
	u_int32_t                           protocol_family;
	u_int32_t                           demux_count;
	user32_addr_t                       demux_list;
};
#endif /* KERNEL_PRIVATE */

#define SOL_NDRVPROTO           NDRVPROTO_NDRV  /* Use this socket level */
#define NDRV_DELDMXSPEC         0x02                    /* Delete the registered protocol */
#define NDRV_SETDMXSPEC         0x04                    /* Set the protocol spec */
#define NDRV_ADDMULTICAST       0x05                    /* Add a physical multicast address */
#define NDRV_DELMULTICAST       0x06                    /* Delete a phyiscal multicast */

/*
 * SOL_NDRVPROTO - use this for the socket level when calling setsocketopt
 * NDRV_DELDMXSPEC - removes the registered protocol and all related demuxes
 * NDRV_SETDMXSPEC - set the protocol to receive, use struct ndrv_protocol_desc
 *					 as the parameter.
 * NDRV_ADDMULTICAST - Enable reception of a phyiscal multicast address, use
 *                     a sockaddr of the appropriate type for the media in use.
 * NDRV_DELMULTICAST - Disable reception of a phyiscal multicast address, use
 *					   a sockaddr of the appropriate type for the media in use.
 *
 * When adding multicasts, the multicasts are ref counted. If the multicast is
 * already registered in the kernel, the count will be bumped. When deleting
 * the multicast, the count is decremented. If the count reaches zero the
 * multicast is removed. If your process is killed, PF_NDRV will unregister
 * the mulitcasts you've added. You can only delete multicasts you've added
 * on the same socket.
 *
 * If the interface goes away while your socket is open, your protocol is
 * immediately detached and sending/receiving is disabled on the socket.
 * If you need a chance to do something, please file a bug and we can give
 * you a second or two.
 */

/* Max number of descriptions allowed by default */
#define NDRV_DMUX_MAX_DESCR     1024

/*
 * sysctl MIB tags at the kern.ipc.nrdv level
 */
#define NRDV_MULTICAST_ADDRS_PER_SOCK 1 /* to toggle NDRV_DMUX_MAX_DESCR value */

#endif  /* _NET_NDRV_H */