Quelle if_fddi.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system.  INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* Global definitions for the ANSI FDDI interface.
*
* Version: @(#)if_fddi.h 1.0.3 Oct  6 2018
*
* Author: Lawrence V. Stefani, <stefani@yahoo.com>
* Maintainer: Maciej W. Rozycki, <macro@orcam.me.uk>
*
* if_fddi.h is based on previous if_ether.h and if_tr.h work by
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
* Donald Becker, <becker@super.org>
* Alan Cox, <alan@lxorguk.ukuu.org.uk>
* Steve Whitehouse, <gw7rrm@eeshack3.swan.ac.uk>
* Peter De Schrijver, <stud11@cc4.kuleuven.ac.be>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _UAPI_LINUX_IF_FDDI_H
#define _UAPI_LINUX_IF_FDDI_H

#include <linux/types.h>

/*
*  Define max and min legal sizes.  The frame sizes do not include
*  4 byte FCS/CRC (frame check sequence).
*/
#define FDDI_K_ALEN  6 /* Octets in one FDDI address */
#define FDDI_K_8022_HLEN 16 /* Total octets in 802.2 header */
#define FDDI_K_SNAP_HLEN 21 /* Total octets in 802.2 SNAP header */
#define FDDI_K_8022_ZLEN 16 /* Min octets in 802.2 frame sans
   FCS */
#define FDDI_K_SNAP_ZLEN 21 /* Min octets in 802.2 SNAP frame sans
   FCS */
#define FDDI_K_8022_DLEN 4475 /* Max octets in 802.2 payload */
#define FDDI_K_SNAP_DLEN 4470 /* Max octets in 802.2 SNAP payload */
#define FDDI_K_LLC_ZLEN  13 /* Min octets in LLC frame sans FCS */
#define FDDI_K_LLC_LEN  4491 /* Max octets in LLC frame sans FCS */
#define FDDI_K_OUI_LEN  3 /* Octets in OUI in 802.2 SNAP
   header */

/* Define FDDI Frame Control (FC) Byte masks */
#define FDDI_FC_K_CLASS_MASK  0x80 /* class bit */
#define FDDI_FC_K_CLASS_SYNC  0x80
#define FDDI_FC_K_CLASS_ASYNC  0x00
#define FDDI_FC_K_ALEN_MASK  0x40 /* address length bit */
#define FDDI_FC_K_ALEN_48  0x40
#define FDDI_FC_K_ALEN_16  0x00
#define FDDI_FC_K_FORMAT_MASK  0x30 /* format bits */
#define FDDI_FC_K_FORMAT_FUTURE  0x30
#define FDDI_FC_K_FORMAT_IMPLEMENTOR 0x20
#define FDDI_FC_K_FORMAT_LLC  0x10
#define FDDI_FC_K_FORMAT_MANAGEMENT 0x00
#define FDDI_FC_K_CONTROL_MASK  0x0f /* control bits */

/* Define FDDI Frame Control (FC) Byte specific values */
#define FDDI_FC_K_VOID   0x00
#define FDDI_FC_K_NON_RESTRICTED_TOKEN 0x80
#define FDDI_FC_K_RESTRICTED_TOKEN 0xC0
#define FDDI_FC_K_SMT_MIN  0x41
#define FDDI_FC_K_SMT_MAX  0x4F
#define FDDI_FC_K_MAC_MIN  0xC1
#define FDDI_FC_K_MAC_MAX  0xCF
#define FDDI_FC_K_ASYNC_LLC_MIN  0x50
#define FDDI_FC_K_ASYNC_LLC_DEF  0x54
#define FDDI_FC_K_ASYNC_LLC_MAX  0x5F
#define FDDI_FC_K_SYNC_LLC_MIN  0xD0
#define FDDI_FC_K_SYNC_LLC_MAX  0xD7
#define FDDI_FC_K_IMPLEMENTOR_MIN 0x60
#define FDDI_FC_K_IMPLEMENTOR_MAX 0x6F
#define FDDI_FC_K_RESERVED_MIN  0x70
#define FDDI_FC_K_RESERVED_MAX  0x7F

/* Define LLC and SNAP constants */
#define FDDI_EXTENDED_SAP  0xAA
#define FDDI_UI_CMD   0x03

/* Define 802.2 Type 1 header */
struct fddi_8022_1_hdr {
__u8 dsap;   /* destination service access point */
__u8 ssap;   /* source service access point */
__u8 ctrl;   /* control byte #1 */
} __attribute__((packed));

/* Define 802.2 Type 2 header */
struct fddi_8022_2_hdr {
__u8 dsap;   /* destination service access point */
__u8 ssap;   /* source service access point */
__u8 ctrl_1;   /* control byte #1 */
__u8 ctrl_2;   /* control byte #2 */
} __attribute__((packed));

/* Define 802.2 SNAP header */
struct fddi_snap_hdr {
__u8 dsap;   /* always 0xAA */
__u8 ssap;   /* always 0xAA */
__u8 ctrl;   /* always 0x03 */
__u8 oui[FDDI_K_OUI_LEN]; /* organizational universal id */
__be16 ethertype;  /* packet type ID field */
} __attribute__((packed));

/* Define FDDI LLC frame header */
struct fddihdr {
__u8 fc;   /* frame control */
__u8 daddr[FDDI_K_ALEN]; /* destination address */
__u8 saddr[FDDI_K_ALEN]; /* source address */
union {
  struct fddi_8022_1_hdr llc_8022_1;
  struct fddi_8022_2_hdr llc_8022_2;
  struct fddi_snap_hdr llc_snap;
} hdr;
} __attribute__((packed));

#endif /* _UAPI_LINUX_IF_FDDI_H */

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