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(&eth_pack_p->eth_dst, &(dst), ETH_ADDR_LEN);	\
58        memmove(&eth_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