139 строки
4.4 KiB
C
139 строки
4.4 KiB
C
/*
|
|
* 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_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 */
|