eth.h

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/*
 * eth.h
 *
 * Ethernet.
 *
 * Copyright (c) 2000 Dug Song <dugsong@monkey.org>
 *
 * $Id: eth.h,v 1.16 2005/01/25 21:29:12 dugsong Exp $
 */

#ifndef DNET_ETH_H
#define DNET_ETH_H

#define ETH_ADDR_LEN    6
#define ETH_ADDR_BITS   48
#define ETH_TYPE_LEN    2
#define ETH_CRC_LEN     4
#define ETH_HDR_LEN     14

#define ETH_LEN_MIN     64              /* minimum frame length with CRC */
#define ETH_LEN_MAX     1518            /* maximum frame length with CRC */

#define ETH_MTU         (ETH_LEN_MAX - ETH_HDR_LEN - ETH_CRC_LEN)
#define ETH_MIN         (ETH_LEN_MIN - ETH_HDR_LEN - ETH_CRC_LEN)

typedef struct eth_addr {
        uint8_t         data[ETH_ADDR_LEN];
} eth_addr_t;

struct eth_hdr {
        eth_addr_t      eth_dst;        /* destination address */
        eth_addr_t      eth_src;        /* source address */
        uint16_t        eth_type;       /* payload type */
};

/*
 * Ethernet payload types - http://standards.ieee.org/regauth/ethertype
 */
#define ETH_TYPE_PUP    0x0200          /* PUP protocol */
#define ETH_TYPE_IP     0x0800          /* IP protocol */
#define ETH_TYPE_ARP    0x0806          /* address resolution protocol */
#define ETH_TYPE_REVARP 0x8035          /* reverse addr resolution protocol */
#define ETH_TYPE_8021Q  0x8100          /* IEEE 802.1Q VLAN tagging */
#define ETH_TYPE_IPV6   0x86DD          /* IPv6 protocol */
#define ETH_TYPE_MPLS   0x8847          /* MPLS */
#define ETH_TYPE_MPLS_MCAST     0x8848  /* MPLS Multicast */
#define ETH_TYPE_PPPOEDISC      0x8863  /* PPP Over Ethernet Discovery Stage */
#define ETH_TYPE_PPPOE  0x8864          /* PPP Over Ethernet Session Stage */
#define ETH_TYPE_LOOPBACK       0x9000  /* used to test interfaces */

#define ETH_IS_MULTICAST(ea)    (*(ea) & 0x01) /* is address mcast/bcast? */

#define ETH_ADDR_BROADCAST      "\xff\xff\xff\xff\xff\xff"

#define eth_pack_hdr(h, dst, src, type) do {                    \
        struct eth_hdr *eth_pack_p = (struct eth_hdr *)(h);     \
        memmove(&eth_pack_p->eth_dst, &(dst), ETH_ADDR_LEN);    \
        memmove(&eth_pack_p->eth_src, &(src), ETH_ADDR_LEN);    \
        eth_pack_p->eth_type = htons(type);                     \
} while (0)

typedef struct eth_handle eth_t;

__BEGIN_DECLS
eth_t   *eth_open(const char *device);
int      eth_get(eth_t *e, eth_addr_t *ea);
int      eth_set(eth_t *e, const eth_addr_t *ea);
ssize_t  eth_send(eth_t *e, const void *buf, size_t len);
eth_t   *eth_close(eth_t *e);

char    *eth_ntop(const eth_addr_t *eth, char *dst, size_t len);
int      eth_pton(const char *src, eth_addr_t *dst);
char    *eth_ntoa(const eth_addr_t *eth);
#define  eth_aton eth_pton
__END_DECLS

#endif /* DNET_ETH_H */

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