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1da177e4 LT |
1 | /* |
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. | |
5 | * | |
6 | * Definitions for the Ethernet handlers. | |
7 | * | |
8 | * Version: @(#)eth.h 1.0.4 05/13/93 | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * | |
13 | * Relocated to include/linux where it belongs by Alan Cox | |
14 | * <gw4pts@gw4pts.ampr.org> | |
15 | * | |
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. | |
20 | * | |
21 | * WARNING: This move may well be temporary. This file will get merged with others RSN. | |
22 | * | |
23 | */ | |
24 | #ifndef _LINUX_ETHERDEVICE_H | |
25 | #define _LINUX_ETHERDEVICE_H | |
26 | ||
27 | #include <linux/if_ether.h> | |
28 | #include <linux/random.h> | |
29 | ||
30 | #ifdef __KERNEL__ | |
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, | |
39 | struct hh_cache *hh); | |
40 | ||
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, | |
44 | int len, int base) | |
45 | { | |
46 | memcpy (dest->data, src, len); | |
47 | } | |
48 | ||
49 | /** | |
50 | * is_zero_ether_addr - Determine if give Ethernet address is all | |
51 | * zeros. | |
52 | */ | |
53 | static inline int is_zero_ether_addr(const u8 *addr) | |
54 | { | |
55 | return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]); | |
56 | } | |
57 | ||
79165121 ME |
58 | /** |
59 | * is_multicast_ether_addr - Determine if the given Ethernet address is a | |
60 | * multicast address. | |
61 | * | |
62 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
63 | * | |
64 | * Return true if the address is a multicast address. | |
65 | */ | |
66 | static inline int is_multicast_ether_addr(const u8 *addr) | |
67 | { | |
a5fe736e | 68 | return ((addr[0] != 0xff) && (0x01 & addr[0])); |
79165121 ME |
69 | } |
70 | ||
1da177e4 LT |
71 | /** |
72 | * is_valid_ether_addr - Determine if the given Ethernet address is valid | |
73 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
74 | * | |
75 | * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not | |
79165121 | 76 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
1da177e4 LT |
77 | * |
78 | * Return true if the address is valid. | |
79 | */ | |
80 | static inline int is_valid_ether_addr(const u8 *addr) | |
81 | { | |
79165121 ME |
82 | /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to |
83 | * explicitly check for it here. */ | |
84 | return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); | |
1da177e4 LT |
85 | } |
86 | ||
87 | /** | |
88 | * random_ether_addr - Generate software assigned random Ethernet address | |
89 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
90 | * | |
91 | * Generate a random Ethernet address (MAC) that is not multicast | |
92 | * and has the local assigned bit set. | |
93 | */ | |
94 | static inline void random_ether_addr(u8 *addr) | |
95 | { | |
96 | get_random_bytes (addr, ETH_ALEN); | |
97 | addr [0] &= 0xfe; /* clear multicast bit */ | |
98 | addr [0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
99 | } | |
79165121 | 100 | #endif /* __KERNEL__ */ |
1da177e4 LT |
101 | |
102 | #endif /* _LINUX_ETHERDEVICE_H */ |