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| 1 | /* Copyright (C) 1997-2024 Free Software Foundation, Inc. |
|---|---|
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <https://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | /* Based on the FreeBSD version of this file. Curiously, that file |
| 19 | lacks a copyright in the header. */ |
| 20 | |
| 21 | #ifndef __NET_ETHERNET_H |
| 22 | #define __NET_ETHERNET_H 1 |
| 23 | |
| 24 | #include <sys/cdefs.h> |
| 25 | #include <sys/types.h> |
| 26 | #include <stdint.h> |
| 27 | #include <net/if_ether.h> /* IEEE 802.3 Ethernet constants */ |
| 28 | |
| 29 | __BEGIN_DECLS |
| 30 | |
| 31 | /* This is a name for the 48 bit ethernet address available on many |
| 32 | systems. */ |
| 33 | struct ether_addr |
| 34 | { |
| 35 | uint8_t ether_addr_octet[ETH_ALEN]; |
| 36 | }; |
| 37 | |
| 38 | /* 10Mb/s ethernet header */ |
| 39 | struct ether_header |
| 40 | { |
| 41 | uint8_t ether_dhost[ETH_ALEN]; /* destination eth addr */ |
| 42 | uint8_t ether_shost[ETH_ALEN]; /* source ether addr */ |
| 43 | uint16_t ether_type; /* packet type ID field */ |
| 44 | }; |
| 45 | |
| 46 | /* Ethernet protocol ID's */ |
| 47 | #define ETHERTYPE_PUP 0x0200 /* Xerox PUP */ |
| 48 | #define ETHERTYPE_IP 0x0800 /* IP */ |
| 49 | #define ETHERTYPE_ARP 0x0806 /* Address resolution */ |
| 50 | #define ETHERTYPE_REVARP 0x8035 /* Reverse ARP */ |
| 51 | |
| 52 | #define ETHER_ADDR_LEN ETH_ALEN /* size of ethernet addr */ |
| 53 | #define ETHER_TYPE_LEN 2 /* bytes in type field */ |
| 54 | #define ETHER_CRC_LEN 4 /* bytes in CRC field */ |
| 55 | #define ETHER_HDR_LEN ETH_HLEN /* total octets in header */ |
| 56 | #define ETHER_MIN_LEN (ETH_ZLEN + ETH_CRC_LEN) /* min packet length */ |
| 57 | #define ETHER_MAX_LEN (ETH_FRAME_LEN + ETH_CRC_LEN) /* max packet length */ |
| 58 | |
| 59 | /* make sure ethernet length is valid */ |
| 60 | #define ETHER_IS_VALID_LEN(foo) \ |
| 61 | ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN) |
| 62 | |
| 63 | /* |
| 64 | * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have |
| 65 | * (type-ETHERTYPE_TRAIL)*512 bytes of data followed |
| 66 | * by an ETHER type (as given above) and then the (variable-length) header. |
| 67 | */ |
| 68 | #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ |
| 69 | #define ETHERTYPE_NTRAILER 16 |
| 70 | |
| 71 | #define ETHERMTU ETH_DATA_LEN |
| 72 | #define ETHERMIN (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN) |
| 73 | |
| 74 | __END_DECLS |
| 75 | |
| 76 | #endif /* net/ethernet.h */ |
| 77 |
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