2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. NET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * Definitions for the Ethernet handlers.
8 * Version: @(#)eth.h 1.0.4 05/13/93
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
13 * Relocated to include/linux where it belongs by Alan Cox
14 * <gw4pts@gw4pts.ampr.org>
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
21 * WARNING: This move may well be temporary. This file will get merged with others RSN.
24 #ifndef _LINUX_ETHERDEVICE_H
25 #define _LINUX_ETHERDEVICE_H
27 #include <linux/if_ether.h>
28 #include <linux/random.h>
31 extern int eth_header(struct sk_buff *skb, struct net_device *dev,
32 unsigned short type, void *daddr,
33 void *saddr, unsigned len);
34 extern int eth_rebuild_header(struct sk_buff *skb);
35 extern unsigned short eth_type_trans(struct sk_buff *skb, struct net_device *dev);
36 extern void eth_header_cache_update(struct hh_cache *hh, struct net_device *dev,
37 unsigned char * haddr);
38 extern int eth_header_cache(struct neighbour *neigh,
41 extern struct net_device *alloc_etherdev(int sizeof_priv);
42 static inline void eth_copy_and_sum (struct sk_buff *dest,
43 const unsigned char *src,
46 memcpy (dest->data, src, len);
50 * is_zero_ether_addr - Determine if give Ethernet address is all
53 static inline int is_zero_ether_addr(const u8 *addr)
55 return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
59 * is_multicast_ether_addr - Determine if the given Ethernet address is a
62 * @addr: Pointer to a six-byte array containing the Ethernet address
64 * Return true if the address is a multicast address.
66 static inline int is_multicast_ether_addr(const u8 *addr)
68 return ((addr[0] != 0xff) && (0x01 & addr[0]));
71 static inline int is_broadcast_ether_addr(const u8 *addr)
73 return ((addr[0] == 0xff) && (addr[1] == 0xff) && (addr[2] == 0xff) &&
74 (addr[3] == 0xff) && (addr[4] == 0xff) && (addr[5] == 0xff));
78 * is_valid_ether_addr - Determine if the given Ethernet address is valid
79 * @addr: Pointer to a six-byte array containing the Ethernet address
81 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
82 * a multicast address, and is not FF:FF:FF:FF:FF:FF.
84 * Return true if the address is valid.
86 static inline int is_valid_ether_addr(const u8 *addr)
88 /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
89 * explicitly check for it here. */
90 return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
94 * random_ether_addr - Generate software assigned random Ethernet address
95 * @addr: Pointer to a six-byte array containing the Ethernet address
97 * Generate a random Ethernet address (MAC) that is not multicast
98 * and has the local assigned bit set.
100 static inline void random_ether_addr(u8 *addr)
102 get_random_bytes (addr, ETH_ALEN);
103 addr [0] &= 0xfe; /* clear multicast bit */
104 addr [0] |= 0x02; /* set local assignment bit (IEEE802) */
106 #endif /* __KERNEL__ */
108 #endif /* _LINUX_ETHERDEVICE_H */