| 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 | * |
| 10 | * Authors: Ross Biro, <bir7@leland.Stanford.Edu> |
| 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 | |
| 58 | /** |
| 59 | * is_valid_ether_addr - Determine if the given Ethernet address is valid |
| 60 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 61 | * |
| 62 | * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not |
| 63 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. The multicast |
| 64 | * and FF:FF:... tests are combined into the single test "!(addr[0]&1)". |
| 65 | * |
| 66 | * Return true if the address is valid. |
| 67 | */ |
| 68 | static inline int is_valid_ether_addr(const u8 *addr) |
| 69 | { |
| 70 | return !(addr[0]&1) && !is_zero_ether_addr(addr); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * random_ether_addr - Generate software assigned random Ethernet address |
| 75 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 76 | * |
| 77 | * Generate a random Ethernet address (MAC) that is not multicast |
| 78 | * and has the local assigned bit set. |
| 79 | */ |
| 80 | static inline void random_ether_addr(u8 *addr) |
| 81 | { |
| 82 | get_random_bytes (addr, ETH_ALEN); |
| 83 | addr [0] &= 0xfe; /* clear multicast bit */ |
| 84 | addr [0] |= 0x02; /* set local assignment bit (IEEE802) */ |
| 85 | } |
| 86 | #endif |
| 87 | |
| 88 | #endif /* _LINUX_ETHERDEVICE_H */ |