kernel-ark/include/linux/etherdevice.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

89 lines
2.8 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, <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 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.
*/
static inline int is_zero_ether_addr(const u8 *addr)
{
return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
}
/**
* 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(const u8 *addr)
{
return !(addr[0]&1) && !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) */
}
#endif
#endif /* _LINUX_ETHERDEVICE_H */