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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); | |
1da177e4 LT |
43 | |
44 | /** | |
c2da8aca SH |
45 | * is_zero_ether_addr - Determine if give Ethernet address is all zeros. |
46 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
47 | * | |
48 | * Return true if the address is all zeroes. | |
1da177e4 LT |
49 | */ |
50 | static inline int is_zero_ether_addr(const u8 *addr) | |
51 | { | |
52 | return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]); | |
53 | } | |
54 | ||
79165121 | 55 | /** |
c2da8aca | 56 | * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. |
79165121 ME |
57 | * @addr: Pointer to a six-byte array containing the Ethernet address |
58 | * | |
59 | * Return true if the address is a multicast address. | |
88df8ef5 | 60 | * By definition the broadcast address is also a multicast address. |
79165121 ME |
61 | */ |
62 | static inline int is_multicast_ether_addr(const u8 *addr) | |
63 | { | |
88df8ef5 | 64 | return (0x01 & addr[0]); |
79165121 ME |
65 | } |
66 | ||
e024715f PBG |
67 | /** |
68 | * is_local_ether_addr - Determine if the Ethernet address is locally-assigned | |
69 | * one (IEEE 802). | |
70 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
71 | * | |
72 | * Return true if the address is a local address. | |
73 | */ | |
74 | static inline int is_local_ether_addr(const u8 *addr) | |
75 | { | |
76 | return (0x02 & addr[0]); | |
77 | } | |
78 | ||
c2da8aca SH |
79 | /** |
80 | * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast | |
81 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
82 | * | |
83 | * Return true if the address is the broadcast address. | |
84 | */ | |
9bd481f8 JG |
85 | static inline int is_broadcast_ether_addr(const u8 *addr) |
86 | { | |
2407534f | 87 | return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff; |
9bd481f8 JG |
88 | } |
89 | ||
1da177e4 LT |
90 | /** |
91 | * is_valid_ether_addr - Determine if the given Ethernet address is valid | |
92 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
93 | * | |
94 | * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not | |
79165121 | 95 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
1da177e4 LT |
96 | * |
97 | * Return true if the address is valid. | |
98 | */ | |
99 | static inline int is_valid_ether_addr(const u8 *addr) | |
100 | { | |
79165121 ME |
101 | /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to |
102 | * explicitly check for it here. */ | |
103 | return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); | |
1da177e4 LT |
104 | } |
105 | ||
106 | /** | |
107 | * random_ether_addr - Generate software assigned random Ethernet address | |
108 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
109 | * | |
110 | * Generate a random Ethernet address (MAC) that is not multicast | |
111 | * and has the local assigned bit set. | |
112 | */ | |
113 | static inline void random_ether_addr(u8 *addr) | |
114 | { | |
115 | get_random_bytes (addr, ETH_ALEN); | |
116 | addr [0] &= 0xfe; /* clear multicast bit */ | |
117 | addr [0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
118 | } | |
360ac8e2 SH |
119 | |
120 | /** | |
121 | * compare_ether_addr - Compare two Ethernet addresses | |
122 | * @addr1: Pointer to a six-byte array containing the Ethernet address | |
c2da8aca | 123 | * @addr2: Pointer other six-byte array containing the Ethernet address |
360ac8e2 SH |
124 | * |
125 | * Compare two ethernet addresses, returns 0 if equal | |
126 | */ | |
c2da8aca | 127 | static inline unsigned compare_ether_addr(const u8 *addr1, const u8 *addr2) |
360ac8e2 | 128 | { |
c2da8aca SH |
129 | const u16 *a = (const u16 *) addr1; |
130 | const u16 *b = (const u16 *) addr2; | |
360ac8e2 SH |
131 | |
132 | BUILD_BUG_ON(ETH_ALEN != 6); | |
133 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0; | |
134 | } | |
79165121 | 135 | #endif /* __KERNEL__ */ |
1da177e4 LT |
136 | |
137 | #endif /* _LINUX_ETHERDEVICE_H */ |