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/netdevice.h>
29 #include <linux/random.h>
32 extern int eth_header(struct sk_buff
*skb
, struct net_device
*dev
,
33 unsigned short type
, void *daddr
,
34 void *saddr
, unsigned len
);
35 extern int eth_rebuild_header(struct sk_buff
*skb
);
36 extern __be16
eth_type_trans(struct sk_buff
*skb
, struct net_device
*dev
);
37 extern void eth_header_cache_update(struct hh_cache
*hh
, struct net_device
*dev
,
38 unsigned char * haddr
);
39 extern int eth_header_cache(struct neighbour
*neigh
,
42 extern struct net_device
*alloc_etherdev(int sizeof_priv
);
43 static inline void eth_copy_and_sum (struct sk_buff
*dest
,
44 const unsigned char *src
,
47 memcpy (dest
->data
, src
, len
);
51 * is_zero_ether_addr - Determine if give Ethernet address is all zeros.
52 * @addr: Pointer to a six-byte array containing the Ethernet address
54 * Return true if the address is all zeroes.
56 static inline int is_zero_ether_addr(const u8
*addr
)
58 return !(addr
[0] | addr
[1] | addr
[2] | addr
[3] | addr
[4] | addr
[5]);
62 * is_multicast_ether_addr - Determine if the Ethernet address is a multicast.
63 * @addr: Pointer to a six-byte array containing the Ethernet address
65 * Return true if the address is a multicast address.
67 static inline int is_multicast_ether_addr(const u8
*addr
)
69 return ((addr
[0] != 0xff) && (0x01 & addr
[0]));
73 * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast
74 * @addr: Pointer to a six-byte array containing the Ethernet address
76 * Return true if the address is the broadcast address.
78 static inline int is_broadcast_ether_addr(const u8
*addr
)
80 return (addr
[0] & addr
[1] & addr
[2] & addr
[3] & addr
[4] & addr
[5]) == 0xff;
84 * is_valid_ether_addr - Determine if the given Ethernet address is valid
85 * @addr: Pointer to a six-byte array containing the Ethernet address
87 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
88 * a multicast address, and is not FF:FF:FF:FF:FF:FF.
90 * Return true if the address is valid.
92 static inline int is_valid_ether_addr(const u8
*addr
)
94 /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
95 * explicitly check for it here. */
96 return !is_multicast_ether_addr(addr
) && !is_zero_ether_addr(addr
);
100 * random_ether_addr - Generate software assigned random Ethernet address
101 * @addr: Pointer to a six-byte array containing the Ethernet address
103 * Generate a random Ethernet address (MAC) that is not multicast
104 * and has the local assigned bit set.
106 static inline void random_ether_addr(u8
*addr
)
108 get_random_bytes (addr
, ETH_ALEN
);
109 addr
[0] &= 0xfe; /* clear multicast bit */
110 addr
[0] |= 0x02; /* set local assignment bit (IEEE802) */
114 * compare_ether_addr - Compare two Ethernet addresses
115 * @addr1: Pointer to a six-byte array containing the Ethernet address
116 * @addr2: Pointer other six-byte array containing the Ethernet address
118 * Compare two ethernet addresses, returns 0 if equal
120 static inline unsigned compare_ether_addr(const u8
*addr1
, const u8
*addr2
)
122 const u16
*a
= (const u16
*) addr1
;
123 const u16
*b
= (const u16
*) addr2
;
125 BUILD_BUG_ON(ETH_ALEN
!= 6);
126 return ((a
[0] ^ b
[0]) | (a
[1] ^ b
[1]) | (a
[2] ^ b
[2])) != 0;
128 #endif /* __KERNEL__ */
130 #endif /* _LINUX_ETHERDEVICE_H */
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