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/*

 * 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

 *              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/netdevice.h>

#include <linux/random.h>

#ifdef __KERNEL__

extern __be16           eth_type_trans(struct sk_buff *skb, struct net_device *dev);

extern const struct header_ops eth_header_ops;

extern int eth_header(struct sk_buff *skb, struct net_device *dev,

                      unsigned short type,

                      const void *daddr, const void *saddr, unsigned len);

extern int eth_rebuild_header(struct sk_buff *skb);

extern int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);

extern int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh);

extern void eth_header_cache_update(struct hh_cache *hh,

                                    const struct net_device *dev,

                                    const unsigned char *haddr);

extern struct net_device *alloc_etherdev_mq(int sizeof_priv, unsigned int queue_count);

#define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)

/**

 * is_zero_ether_addr - Determine if give Ethernet address is all zeros.

 * @addr: Pointer to a six-byte array containing the Ethernet address

 *

 * Return true if the address is all zeroes.

 */

static inline int is_zero_ether_addr(const u8 *addr)

{

        return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);

}

/**

 * is_multicast_ether_addr - Determine if the Ethernet address is a multicast.

 * @addr: Pointer to a six-byte array containing the Ethernet address

 *

 * Return true if the address is a multicast address.

 * By definition the broadcast address is also a multicast address.

 */

static inline int is_multicast_ether_addr(const u8 *addr)

{

        return (0x01 & addr[0]);

}

/**

 * is_local_ether_addr - Determine if the Ethernet address is locally-assigned

 * one (IEEE 802).

 * @addr: Pointer to a six-byte array containing the Ethernet address

 *

 * Return true if the address is a local address.

 */

static inline int is_local_ether_addr(const u8 *addr)

{

        return (0x02 & addr[0]);

}

/**

 * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast

 * @addr: Pointer to a six-byte array containing the Ethernet address

 *

 * Return true if the address is the broadcast address.

 */

static inline int is_broadcast_ether_addr(const u8 *addr)

{

        return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff;

}

/**

 * 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.

 *

 * Return true if the address is valid.

 */

static inline int is_valid_ether_addr(const u8 *addr)

{

        /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to

         * explicitly check for it here. */

        return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);

}

/**

 * 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  /* __KERNEL__ */

#endif  /* _LINUX_ETHERDEVICE_H */