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1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. NET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for the Ethernet handlers.
7 *
8 * Version: @(#)eth.h 1.0.4 05/13/93
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *
13 * Relocated to include/linux where it belongs by Alan Cox
14 * <gw4pts@gw4pts.ampr.org>
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
20 *
21 * WARNING: This move may well be temporary. This file will get merged with others RSN.
22 *
23 */
24#ifndef _LINUX_ETHERDEVICE_H
25#define _LINUX_ETHERDEVICE_H
26
27#include <linux/if_ether.h>
28#include <linux/netdevice.h>
29#include <linux/random.h>
30
31#ifdef __KERNEL__
32extern int eth_header(struct sk_buff *skb, struct net_device *dev,
33 unsigned short type, void *daddr,
34 void *saddr, unsigned len);
35extern int eth_rebuild_header(struct sk_buff *skb);
36extern __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
37extern void eth_header_cache_update(struct hh_cache *hh, struct net_device *dev,
38 unsigned char * haddr);
39extern int eth_header_cache(struct neighbour *neigh,
40 struct hh_cache *hh);
41
42extern struct net_device *alloc_etherdev(int sizeof_priv);
43static inline void eth_copy_and_sum (struct sk_buff *dest,
44 const unsigned char *src,
45 int len, int base)
46{
47 memcpy (dest->data, src, len);
48}
49
50/**
51 * is_zero_ether_addr - Determine if give Ethernet address is all
52 * zeros.
53 */
54static inline int is_zero_ether_addr(const u8 *addr)
55{
56 return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
57}
58
59/**
60 * is_multicast_ether_addr - Determine if the given Ethernet address is a
61 * multicast address.
62 *
63 * @addr: Pointer to a six-byte array containing the Ethernet address
64 *
65 * Return true if the address is a multicast address.
66 */
67static inline int is_multicast_ether_addr(const u8 *addr)
68{
69 return ((addr[0] != 0xff) && (0x01 & addr[0]));
70}
71
72/**
73 * is_valid_ether_addr - Determine if the given Ethernet address is valid
74 * @addr: Pointer to a six-byte array containing the Ethernet address
75 *
76 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
77 * a multicast address, and is not FF:FF:FF:FF:FF:FF.
78 *
79 * Return true if the address is valid.
80 */
81static inline int is_valid_ether_addr(const u8 *addr)
82{
83 /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
84 * explicitly check for it here. */
85 return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
86}
87
88/**
89 * random_ether_addr - Generate software assigned random Ethernet address
90 * @addr: Pointer to a six-byte array containing the Ethernet address
91 *
92 * Generate a random Ethernet address (MAC) that is not multicast
93 * and has the local assigned bit set.
94 */
95static inline void random_ether_addr(u8 *addr)
96{
97 get_random_bytes (addr, ETH_ALEN);
98 addr [0] &= 0xfe; /* clear multicast bit */
99 addr [0] |= 0x02; /* set local assignment bit (IEEE802) */
100}
101#endif /* __KERNEL__ */
102
103#endif /* _LINUX_ETHERDEVICE_H */