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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/random.h>
29
30#ifdef __KERNEL__
31extern int eth_header(struct sk_buff *skb, struct net_device *dev,
32 unsigned short type, void *daddr,
33 void *saddr, unsigned len);
34extern int eth_rebuild_header(struct sk_buff *skb);
35extern unsigned short eth_type_trans(struct sk_buff *skb, struct net_device *dev);
36extern void eth_header_cache_update(struct hh_cache *hh, struct net_device *dev,
37 unsigned char * haddr);
38extern int eth_header_cache(struct neighbour *neigh,
39 struct hh_cache *hh);
40
41extern struct net_device *alloc_etherdev(int sizeof_priv);
42static inline void eth_copy_and_sum (struct sk_buff *dest,
43 const unsigned char *src,
44 int len, int base)
45{
46 memcpy (dest->data, src, len);
47}
48
49/**
50 * is_zero_ether_addr - Determine if give Ethernet address is all
51 * zeros.
52 */
53static inline int is_zero_ether_addr(const u8 *addr)
54{
55 return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
56}
57
58/**
59 * is_multicast_ether_addr - Determine if the given Ethernet address is a
60 * multicast address.
61 *
62 * @addr: Pointer to a six-byte array containing the Ethernet address
63 *
64 * Return true if the address is a multicast address.
65 */
66static inline int is_multicast_ether_addr(const u8 *addr)
67{
68 return addr[0] & 0x01;
69}
70
71/**
72 * is_valid_ether_addr - Determine if the given Ethernet address is valid
73 * @addr: Pointer to a six-byte array containing the Ethernet address
74 *
75 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
76 * a multicast address, and is not FF:FF:FF:FF:FF:FF.
77 *
78 * Return true if the address is valid.
79 */
80static inline int is_valid_ether_addr(const u8 *addr)
81{
82 /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
83 * explicitly check for it here. */
84 return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
85}
86
87/**
88 * random_ether_addr - Generate software assigned random Ethernet address
89 * @addr: Pointer to a six-byte array containing the Ethernet address
90 *
91 * Generate a random Ethernet address (MAC) that is not multicast
92 * and has the local assigned bit set.
93 */
94static inline void random_ether_addr(u8 *addr)
95{
96 get_random_bytes (addr, ETH_ALEN);
97 addr [0] &= 0xfe; /* clear multicast bit */
98 addr [0] |= 0x02; /* set local assignment bit (IEEE802) */
99}
100#endif /* __KERNEL__ */
101
102#endif /* _LINUX_ETHERDEVICE_H */