/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  NET  is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Definitions for the Ethernet handlers.
 *
 * Version:	@(#)eth.h	1.0.4	05/13/93
 *
 * Authors:	Ross Biro, <bir7@leland.Stanford.Edu>
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *		Relocated to include/linux where it belongs by Alan Cox 
 *							<gw4pts@gw4pts.ampr.org>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *	WARNING: This move may well be temporary. This file will get merged with others RSN.
 *
 */
#ifndef _LINUX_ETHERDEVICE_H
#define _LINUX_ETHERDEVICE_H

#include <linux/if_ether.h>
#include <linux/random.h>

#ifdef __KERNEL__
extern int		eth_header(struct sk_buff *skb, struct net_device *dev,
				   unsigned short type, void *daddr,
				   void *saddr, unsigned len);
extern int		eth_rebuild_header(struct sk_buff *skb);
extern unsigned short	eth_type_trans(struct sk_buff *skb, struct net_device *dev);
extern void		eth_header_cache_update(struct hh_cache *hh, struct net_device *dev,
						unsigned char * haddr);
extern int		eth_header_cache(struct neighbour *neigh,
					 struct hh_cache *hh);
extern int		eth_header_parse(struct sk_buff *skb,
					 unsigned char *haddr);
extern struct net_device *init_etherdev(struct net_device *dev, int sizeof_priv);
extern struct net_device *alloc_etherdev(int sizeof_priv);

static inline void eth_copy_and_sum (struct sk_buff *dest, unsigned char *src, int len, int base)
{
	memcpy (dest->data, src, len);
}

/**
 * is_valid_ether_addr - Determine if the given Ethernet address is valid
 * @addr: Pointer to a six-byte array containing the Ethernet address
 *
 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
 * a multicast address, and is not FF:FF:FF:FF:FF:FF.  The multicast
 * and FF:FF:... tests are combined into the single test "!(addr[0]&1)".
 *
 * Return true if the address is valid.
 */
static inline int is_valid_ether_addr( u8 *addr )
{
	const char zaddr[6] = {0,};

	return !(addr[0]&1) && memcmp( addr, zaddr, 6);
}

/**
 * random_ether_addr - Generate software assigned random Ethernet address
 * @addr: Pointer to a six-byte array containing the Ethernet address
 *
 * Generate a random Ethernet address (MAC) that is not multicast
 * and has the local assigned bit set.
 */
static inline void random_ether_addr(u8 *addr)
{
	get_random_bytes (addr, ETH_ALEN);
	addr [0] &= 0xfe;	/* clear multicast bit */
	addr [0] |= 0x02;	/* set local assignment bit (IEEE802) */
}

/**
 * compare_ether_addr - Compare two Ethernet addresses
 * @addr1: Pointer to a six-byte array containing the Ethernet address
 * @addr2: Pointer other six-byte array containing the Ethernet address
 *
 * Compare two ethernet addresses, returns 0 if equal
 */
static inline unsigned compare_ether_addr(const u8 *addr1, const u8 *addr2)
{
	const u16 *a = (const u16 *) addr1;
	const u16 *b = (const u16 *) addr2;

	BUILD_BUG_ON(ETH_ALEN != 6);
	return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0;
}
#endif

#endif	/* _LINUX_ETHERDEVICE_H */
