Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Arnd Bergmann | bcd6127 | 2005-06-28 15:58:50 -0700 | [diff] [blame] | 28 | #include <linux/netdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Alexey Dobriyan | ab61148 | 2005-07-12 12:08:43 -0700 | [diff] [blame] | 36 | extern __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | /** |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 61 | /** |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 62 | * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 63 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 64 | * |
| 65 | * Return true if the address is a multicast address. |
| 66 | */ |
| 67 | static inline int is_multicast_ether_addr(const u8 *addr) |
| 68 | { |
Jeff Garzik | a5fe736 | 2005-06-27 22:47:18 -0400 | [diff] [blame] | 69 | return ((addr[0] != 0xff) && (0x01 & addr[0])); |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 70 | } |
| 71 | |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 72 | /** |
| 73 | * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast |
| 74 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 75 | * |
| 76 | * Return true if the address is the broadcast address. |
| 77 | */ |
Jeff Garzik | 9bd481f | 2005-06-28 01:46:35 -0400 | [diff] [blame] | 78 | static inline int is_broadcast_ether_addr(const u8 *addr) |
| 79 | { |
Stephen Hemminger | 2407534 | 2005-11-01 16:52:11 -0800 | [diff] [blame] | 80 | return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff; |
Jeff Garzik | 9bd481f | 2005-06-28 01:46:35 -0400 | [diff] [blame] | 81 | } |
| 82 | |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 83 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
| 86 | * |
| 87 | * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 88 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | * |
| 90 | * Return true if the address is valid. |
| 91 | */ |
| 92 | static inline int is_valid_ether_addr(const u8 *addr) |
| 93 | { |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | /** |
| 100 | * random_ether_addr - Generate software assigned random Ethernet address |
| 101 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 102 | * |
| 103 | * Generate a random Ethernet address (MAC) that is not multicast |
| 104 | * and has the local assigned bit set. |
| 105 | */ |
| 106 | static inline void random_ether_addr(u8 *addr) |
| 107 | { |
| 108 | get_random_bytes (addr, ETH_ALEN); |
| 109 | addr [0] &= 0xfe; /* clear multicast bit */ |
| 110 | addr [0] |= 0x02; /* set local assignment bit (IEEE802) */ |
| 111 | } |
Stephen Hemminger | 360ac8e | 2005-10-25 15:03:41 -0700 | [diff] [blame] | 112 | |
| 113 | /** |
| 114 | * compare_ether_addr - Compare two Ethernet addresses |
| 115 | * @addr1: Pointer to a six-byte array containing the Ethernet address |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 116 | * @addr2: Pointer other six-byte array containing the Ethernet address |
Stephen Hemminger | 360ac8e | 2005-10-25 15:03:41 -0700 | [diff] [blame] | 117 | * |
| 118 | * Compare two ethernet addresses, returns 0 if equal |
| 119 | */ |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 120 | static inline unsigned compare_ether_addr(const u8 *addr1, const u8 *addr2) |
Stephen Hemminger | 360ac8e | 2005-10-25 15:03:41 -0700 | [diff] [blame] | 121 | { |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 122 | const u16 *a = (const u16 *) addr1; |
| 123 | const u16 *b = (const u16 *) addr2; |
Stephen Hemminger | 360ac8e | 2005-10-25 15:03:41 -0700 | [diff] [blame] | 124 | |
| 125 | BUILD_BUG_ON(ETH_ALEN != 6); |
| 126 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0; |
| 127 | } |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 128 | #endif /* __KERNEL__ */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
| 130 | #endif /* _LINUX_ETHERDEVICE_H */ |