1/* 2 * eth.h 3 * 4 * Ethernet. 5 * 6 * Copyright (c) 2000 Dug Song <dugsong@monkey.org> 7 * 8 * $Id: eth.h,v 1.15 2004/01/03 08:47:23 dugsong Exp $ 9 */ 10 11#ifndef DNET_ETH_H 12#define DNET_ETH_H 13 14#define ETH_ADDR_LEN 6 15#define ETH_ADDR_BITS 48 16#define ETH_TYPE_LEN 2 17#define ETH_CRC_LEN 4 18#define ETH_HDR_LEN 14 19 20#define ETH_LEN_MIN 64 /* minimum frame length with CRC */ 21#define ETH_LEN_MAX 1518 /* maximum frame length with CRC */ 22 23#define ETH_MTU (ETH_LEN_MAX - ETH_HDR_LEN - ETH_CRC_LEN) 24#define ETH_MIN (ETH_LEN_MIN - ETH_HDR_LEN - ETH_CRC_LEN) 25 26typedef struct eth_addr { 27 uint8_t data[ETH_ADDR_LEN]; 28} eth_addr_t; 29 30struct eth_hdr { 31 eth_addr_t eth_dst; /* destination address */ 32 eth_addr_t eth_src; /* source address */ 33 uint16_t eth_type; /* payload type */ 34}; 35 36/* 37 * Ethernet payload types - http://standards.ieee.org/regauth/ethertype 38 */ 39#define ETH_TYPE_PUP 0x0200 /* PUP protocol */ 40#define ETH_TYPE_IP 0x0800 /* IP protocol */ 41#define ETH_TYPE_ARP 0x0806 /* address resolution protocol */ 42#define ETH_TYPE_REVARP 0x8035 /* reverse addr resolution protocol */ 43#define ETH_TYPE_8021Q 0x8100 /* IEEE 802.1Q VLAN tagging */ 44#define ETH_TYPE_IPV6 0x86DD /* IPv6 protocol */ 45#define ETH_TYPE_MPLS 0x8847 /* MPLS */ 46#define ETH_TYPE_MPLS_MCAST 0x8848 /* MPLS Multicast */ 47#define ETH_TYPE_PPPOEDISC 0x8863 /* PPP Over Ethernet Discovery Stage */ 48#define ETH_TYPE_PPPOE 0x8864 /* PPP Over Ethernet Session Stage */ 49#define ETH_TYPE_LOOPBACK 0x9000 /* used to test interfaces */ 50 51#define ETH_IS_MULTICAST(ea) (*(ea) & 0x01) /* is address mcast/bcast? */ 52 53#define ETH_ADDR_BROADCAST "\xff\xff\xff\xff\xff\xff" 54 55#define eth_pack_hdr(h, dst, src, type) do { \ 56 struct eth_hdr *eth_pack_p = (struct eth_hdr *)(h); \ 57 memmove(ð_pack_p->eth_dst, &(dst), ETH_ADDR_LEN); \ 58 memmove(ð_pack_p->eth_src, &(src), ETH_ADDR_LEN); \ 59 eth_pack_p->eth_type = htons(type); \ 60} while (0) 61 62typedef struct eth_handle eth_t; 63 64__BEGIN_DECLS 65eth_t *eth_open(const char *device); 66int eth_get(eth_t *e, eth_addr_t *ea); 67int eth_set(eth_t *e, const eth_addr_t *ea); 68size_t eth_send(eth_t *e, const void *buf, size_t len); 69eth_t *eth_close(eth_t *e); 70 71char *eth_ntop(const eth_addr_t *eth, char *dst, size_t len); 72int eth_pton(const char *src, eth_addr_t *dst); 73char *eth_ntoa(const eth_addr_t *eth); 74#define eth_aton eth_pton 75__END_DECLS 76 77#endif /* DNET_ETH_H */ 78