/* * 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 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 __be16		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 struct net_device *alloc_etherdev(int sizeof_priv);static inline void eth_copy_and_sum (struct sk_buff *dest, 				     const unsigned char *src, 				     int len, int base){	memcpy (dest->data, src, len);} /** * 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_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 */