1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * Global definitions for the ANSI FDDI interface. 8 * 9 * Version: @(#)if_fddi.h 1.0.3 Oct 6 2018 10 * 11 * Author: Lawrence V. Stefani, <stefani@yahoo.com> 12 * Maintainer: Maciej W. Rozycki, <macro@orcam.me.uk> 13 * 14 * if_fddi.h is based on previous if_ether.h and if_tr.h work by 15 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 16 * Donald Becker, <becker@super.org> 17 * Alan Cox, <alan@lxorguk.ukuu.org.uk> 18 * Steve Whitehouse, <gw7rrm@eeshack3.swan.ac.uk> 19 * Peter De Schrijver, <stud11@cc4.kuleuven.ac.be> 20 * 21 * This program is free software; you can redistribute it and/or 22 * modify it under the terms of the GNU General Public License 23 * as published by the Free Software Foundation; either version 24 * 2 of the License, or (at your option) any later version. 25 */ 26 #ifndef _UAPI_LINUX_IF_FDDI_H 27 #define _UAPI_LINUX_IF_FDDI_H 28 29 #include <linux/types.h> 30 31 /* 32 * Define max and min legal sizes. The frame sizes do not include 33 * 4 byte FCS/CRC (frame check sequence). 34 */ 35 #define FDDI_K_ALEN 6 /* Octets in one FDDI address */ 36 #define FDDI_K_8022_HLEN 16 /* Total octets in 802.2 header */ 37 #define FDDI_K_SNAP_HLEN 21 /* Total octets in 802.2 SNAP header */ 38 #define FDDI_K_8022_ZLEN 16 /* Min octets in 802.2 frame sans 39 FCS */ 40 #define FDDI_K_SNAP_ZLEN 21 /* Min octets in 802.2 SNAP frame sans 41 FCS */ 42 #define FDDI_K_8022_DLEN 4475 /* Max octets in 802.2 payload */ 43 #define FDDI_K_SNAP_DLEN 4470 /* Max octets in 802.2 SNAP payload */ 44 #define FDDI_K_LLC_ZLEN 13 /* Min octets in LLC frame sans FCS */ 45 #define FDDI_K_LLC_LEN 4491 /* Max octets in LLC frame sans FCS */ 46 #define FDDI_K_OUI_LEN 3 /* Octets in OUI in 802.2 SNAP 47 header */ 48 49 /* Define FDDI Frame Control (FC) Byte masks */ 50 #define FDDI_FC_K_CLASS_MASK 0x80 /* class bit */ 51 #define FDDI_FC_K_CLASS_SYNC 0x80 52 #define FDDI_FC_K_CLASS_ASYNC 0x00 53 #define FDDI_FC_K_ALEN_MASK 0x40 /* address length bit */ 54 #define FDDI_FC_K_ALEN_48 0x40 55 #define FDDI_FC_K_ALEN_16 0x00 56 #define FDDI_FC_K_FORMAT_MASK 0x30 /* format bits */ 57 #define FDDI_FC_K_FORMAT_FUTURE 0x30 58 #define FDDI_FC_K_FORMAT_IMPLEMENTOR 0x20 59 #define FDDI_FC_K_FORMAT_LLC 0x10 60 #define FDDI_FC_K_FORMAT_MANAGEMENT 0x00 61 #define FDDI_FC_K_CONTROL_MASK 0x0f /* control bits */ 62 63 /* Define FDDI Frame Control (FC) Byte specific values */ 64 #define FDDI_FC_K_VOID 0x00 65 #define FDDI_FC_K_NON_RESTRICTED_TOKEN 0x80 66 #define FDDI_FC_K_RESTRICTED_TOKEN 0xC0 67 #define FDDI_FC_K_SMT_MIN 0x41 68 #define FDDI_FC_K_SMT_MAX 0x4F 69 #define FDDI_FC_K_MAC_MIN 0xC1 70 #define FDDI_FC_K_MAC_MAX 0xCF 71 #define FDDI_FC_K_ASYNC_LLC_MIN 0x50 72 #define FDDI_FC_K_ASYNC_LLC_DEF 0x54 73 #define FDDI_FC_K_ASYNC_LLC_MAX 0x5F 74 #define FDDI_FC_K_SYNC_LLC_MIN 0xD0 75 #define FDDI_FC_K_SYNC_LLC_MAX 0xD7 76 #define FDDI_FC_K_IMPLEMENTOR_MIN 0x60 77 #define FDDI_FC_K_IMPLEMENTOR_MAX 0x6F 78 #define FDDI_FC_K_RESERVED_MIN 0x70 79 #define FDDI_FC_K_RESERVED_MAX 0x7F 80 81 /* Define LLC and SNAP constants */ 82 #define FDDI_EXTENDED_SAP 0xAA 83 #define FDDI_UI_CMD 0x03 84 85 /* Define 802.2 Type 1 header */ 86 struct fddi_8022_1_hdr { 87 __u8 dsap; /* destination service access point */ 88 __u8 ssap; /* source service access point */ 89 __u8 ctrl; /* control byte #1 */ 90 } __attribute__((packed)); 91 92 /* Define 802.2 Type 2 header */ 93 struct fddi_8022_2_hdr { 94 __u8 dsap; /* destination service access point */ 95 __u8 ssap; /* source service access point */ 96 __u8 ctrl_1; /* control byte #1 */ 97 __u8 ctrl_2; /* control byte #2 */ 98 } __attribute__((packed)); 99 100 /* Define 802.2 SNAP header */ 101 struct fddi_snap_hdr { 102 __u8 dsap; /* always 0xAA */ 103 __u8 ssap; /* always 0xAA */ 104 __u8 ctrl; /* always 0x03 */ 105 __u8 oui[FDDI_K_OUI_LEN]; /* organizational universal id */ 106 __be16 ethertype; /* packet type ID field */ 107 } __attribute__((packed)); 108 109 /* Define FDDI LLC frame header */ 110 struct fddihdr { 111 __u8 fc; /* frame control */ 112 __u8 daddr[FDDI_K_ALEN]; /* destination address */ 113 __u8 saddr[FDDI_K_ALEN]; /* source address */ 114 union { 115 struct fddi_8022_1_hdr llc_8022_1; 116 struct fddi_8022_2_hdr llc_8022_2; 117 struct fddi_snap_hdr llc_snap; 118 } hdr; 119 } __attribute__((packed)); 120 121 122 #endif /* _UAPI_LINUX_IF_FDDI_H */ 123