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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 | ||
e024715f PBG |
73 | /** |
74 | * is_local_ether_addr - Determine if the Ethernet address is locally-assigned | |
75 | * one (IEEE 802). | |
76 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
77 | * | |
78 | * Return true if the address is a local address. | |
79 | */ | |
80 | static inline int is_local_ether_addr(const u8 *addr) | |
81 | { | |
82 | return (0x02 & addr[0]); | |
83 | } | |
84 | ||
c2da8aca SH |
85 | /** |
86 | * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast | |
87 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
88 | * | |
89 | * Return true if the address is the broadcast address. | |
90 | */ | |
9bd481f8 JG |
91 | static inline int is_broadcast_ether_addr(const u8 *addr) |
92 | { | |
2407534f | 93 | return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff; |
9bd481f8 JG |
94 | } |
95 | ||
1da177e4 LT |
96 | /** |
97 | * is_valid_ether_addr - Determine if the given Ethernet address is valid | |
98 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
99 | * | |
100 | * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not | |
79165121 | 101 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
1da177e4 LT |
102 | * |
103 | * Return true if the address is valid. | |
104 | */ | |
105 | static inline int is_valid_ether_addr(const u8 *addr) | |
106 | { | |
79165121 ME |
107 | /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to |
108 | * explicitly check for it here. */ | |
109 | return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); | |
1da177e4 LT |
110 | } |
111 | ||
112 | /** | |
113 | * random_ether_addr - Generate software assigned random Ethernet address | |
114 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
115 | * | |
116 | * Generate a random Ethernet address (MAC) that is not multicast | |
117 | * and has the local assigned bit set. | |
118 | */ | |
119 | static inline void random_ether_addr(u8 *addr) | |
120 | { | |
121 | get_random_bytes (addr, ETH_ALEN); | |
122 | addr [0] &= 0xfe; /* clear multicast bit */ | |
123 | addr [0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
124 | } | |
360ac8e2 SH |
125 | |
126 | /** | |
127 | * compare_ether_addr - Compare two Ethernet addresses | |
128 | * @addr1: Pointer to a six-byte array containing the Ethernet address | |
c2da8aca | 129 | * @addr2: Pointer other six-byte array containing the Ethernet address |
360ac8e2 SH |
130 | * |
131 | * Compare two ethernet addresses, returns 0 if equal | |
132 | */ | |
c2da8aca | 133 | static inline unsigned compare_ether_addr(const u8 *addr1, const u8 *addr2) |
360ac8e2 | 134 | { |
c2da8aca SH |
135 | const u16 *a = (const u16 *) addr1; |
136 | const u16 *b = (const u16 *) addr2; | |
360ac8e2 SH |
137 | |
138 | BUILD_BUG_ON(ETH_ALEN != 6); | |
139 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0; | |
140 | } | |
79165121 | 141 | #endif /* __KERNEL__ */ |
1da177e4 LT |
142 | |
143 | #endif /* _LINUX_ETHERDEVICE_H */ |