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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> | |
bcd61272 | 28 | #include <linux/netdevice.h> |
1da177e4 LT |
29 | #include <linux/random.h> |
30 | ||
31 | #ifdef __KERNEL__ | |
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); | |
ab611487 | 36 | extern __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev); |
1da177e4 LT |
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, | |
40 | struct hh_cache *hh); | |
41 | ||
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, | |
45 | int len, int base) | |
46 | { | |
47 | memcpy (dest->data, src, len); | |
48 | } | |
49 | ||
50 | /** | |
c2da8aca SH |
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 | |
53 | * | |
54 | * Return true if the address is all zeroes. | |
1da177e4 LT |
55 | */ |
56 | static inline int is_zero_ether_addr(const u8 *addr) | |
57 | { | |
58 | return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]); | |
59 | } | |
60 | ||
79165121 | 61 | /** |
c2da8aca | 62 | * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. |
79165121 ME |
63 | * @addr: Pointer to a six-byte array containing the Ethernet address |
64 | * | |
65 | * Return true if the address is a multicast address. | |
88df8ef5 | 66 | * By definition the broadcast address is also a multicast address. |
79165121 ME |
67 | */ |
68 | static inline int is_multicast_ether_addr(const u8 *addr) | |
69 | { | |
88df8ef5 | 70 | return (0x01 & addr[0]); |
79165121 ME |
71 | } |
72 | ||
c2da8aca SH |
73 | /** |
74 | * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast | |
75 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
76 | * | |
77 | * Return true if the address is the broadcast address. | |
78 | */ | |
9bd481f8 JG |
79 | static inline int is_broadcast_ether_addr(const u8 *addr) |
80 | { | |
2407534f | 81 | return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff; |
9bd481f8 JG |
82 | } |
83 | ||
1da177e4 LT |
84 | /** |
85 | * is_valid_ether_addr - Determine if the given Ethernet address is valid | |
86 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
87 | * | |
88 | * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not | |
79165121 | 89 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
1da177e4 LT |
90 | * |
91 | * Return true if the address is valid. | |
92 | */ | |
93 | static inline int is_valid_ether_addr(const u8 *addr) | |
94 | { | |
79165121 ME |
95 | /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to |
96 | * explicitly check for it here. */ | |
97 | return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); | |
1da177e4 LT |
98 | } |
99 | ||
100 | /** | |
101 | * random_ether_addr - Generate software assigned random Ethernet address | |
102 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
103 | * | |
104 | * Generate a random Ethernet address (MAC) that is not multicast | |
105 | * and has the local assigned bit set. | |
106 | */ | |
107 | static inline void random_ether_addr(u8 *addr) | |
108 | { | |
109 | get_random_bytes (addr, ETH_ALEN); | |
110 | addr [0] &= 0xfe; /* clear multicast bit */ | |
111 | addr [0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
112 | } | |
360ac8e2 SH |
113 | |
114 | /** | |
115 | * compare_ether_addr - Compare two Ethernet addresses | |
116 | * @addr1: Pointer to a six-byte array containing the Ethernet address | |
c2da8aca | 117 | * @addr2: Pointer other six-byte array containing the Ethernet address |
360ac8e2 SH |
118 | * |
119 | * Compare two ethernet addresses, returns 0 if equal | |
120 | */ | |
c2da8aca | 121 | static inline unsigned compare_ether_addr(const u8 *addr1, const u8 *addr2) |
360ac8e2 | 122 | { |
c2da8aca SH |
123 | const u16 *a = (const u16 *) addr1; |
124 | const u16 *b = (const u16 *) addr2; | |
360ac8e2 SH |
125 | |
126 | BUILD_BUG_ON(ETH_ALEN != 6); | |
127 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0; | |
128 | } | |
79165121 | 129 | #endif /* __KERNEL__ */ |
1da177e4 LT |
130 | |
131 | #endif /* _LINUX_ETHERDEVICE_H */ |