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ethernet.h
/* Copyright (C) 1997-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ /* Based on the FreeBSD version of this file. Curiously, that file lacks a copyright in the header. */ #ifndef __NET_ETHERNET_H #define __NET_ETHERNET_H 1 #include <sys/types.h> #include <stdint.h> #include <linux/if_ether.h> /* IEEE 802.3 Ethernet constants */ __BEGIN_DECLS /* This is a name for the 48 bit ethernet address available on many systems. */ struct ether_addr { uint8_t ether_addr_octet[ETH_ALEN]; } __attribute__ ((__packed__)); /* 10Mb/s ethernet header */ struct ether_header { uint8_t ether_dhost[ETH_ALEN]; /* destination eth addr */ uint8_t ether_shost[ETH_ALEN]; /* source ether addr */ uint16_t ether_type; /* packet type ID field */ } __attribute__ ((__packed__)); /* Ethernet protocol ID's */ #define ETHERTYPE_PUP 0x0200 /* Xerox PUP */ #define ETHERTYPE_SPRITE 0x0500 /* Sprite */ #define ETHERTYPE_IP 0x0800 /* IP */ #define ETHERTYPE_ARP 0x0806 /* Address resolution */ #define ETHERTYPE_REVARP 0x8035 /* Reverse ARP */ #define ETHERTYPE_AT 0x809B /* AppleTalk protocol */ #define ETHERTYPE_AARP 0x80F3 /* AppleTalk ARP */ #define ETHERTYPE_VLAN 0x8100 /* IEEE 802.1Q VLAN tagging */ #define ETHERTYPE_IPX 0x8137 /* IPX */ #define ETHERTYPE_IPV6 0x86dd /* IP protocol version 6 */ #define ETHERTYPE_LOOPBACK 0x9000 /* used to test interfaces */ #define ETHER_ADDR_LEN ETH_ALEN /* size of ethernet addr */ #define ETHER_TYPE_LEN 2 /* bytes in type field */ #define ETHER_CRC_LEN 4 /* bytes in CRC field */ #define ETHER_HDR_LEN ETH_HLEN /* total octets in header */ #define ETHER_MIN_LEN (ETH_ZLEN + ETHER_CRC_LEN) /* min packet length */ #define ETHER_MAX_LEN (ETH_FRAME_LEN + ETHER_CRC_LEN) /* max packet length */ /* make sure ethenet length is valid */ #define ETHER_IS_VALID_LEN(foo) \ ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN) /* * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have * (type-ETHERTYPE_TRAIL)*512 bytes of data followed * by an ETHER type (as given above) and then the (variable-length) header. */ #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ #define ETHERTYPE_NTRAILER 16 #define ETHERMTU ETH_DATA_LEN #define ETHERMIN (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) __END_DECLS #endif /* net/ethernet.h */
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