| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. NET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * Definitions for the Ethernet handlers. |
| * |
| * Version: @(#)eth.h 1.0.4 05/13/93 |
| * |
| * Authors: Ross Biro |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * |
| * Relocated to include/linux where it belongs by Alan Cox |
| * <gw4pts@gw4pts.ampr.org> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| * WARNING: This move may well be temporary. This file will get merged with others RSN. |
| * |
| */ |
| #ifndef _LINUX_ETHERDEVICE_H |
| #define _LINUX_ETHERDEVICE_H |
| |
| #include <linux/if_ether.h> |
| #include <linux/netdevice.h> |
| #include <linux/random.h> |
| |
| #ifdef __KERNEL__ |
| extern int eth_header(struct sk_buff *skb, struct net_device *dev, |
| unsigned short type, void *daddr, |
| void *saddr, unsigned len); |
| extern int eth_rebuild_header(struct sk_buff *skb); |
| extern __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev); |
| extern void eth_header_cache_update(struct hh_cache *hh, struct net_device *dev, |
| unsigned char * haddr); |
| extern int eth_header_cache(struct neighbour *neigh, |
| struct hh_cache *hh); |
| |
| extern struct net_device *alloc_etherdev(int sizeof_priv); |
| static inline void eth_copy_and_sum (struct sk_buff *dest, |
| const unsigned char *src, |
| int len, int base) |
| { |
| memcpy (dest->data, src, len); |
| } |
| |
| /** |
| * is_zero_ether_addr - Determine if give Ethernet address is all zeros. |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Return true if the address is all zeroes. |
| */ |
| static inline int is_zero_ether_addr(const u8 *addr) |
| { |
| return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]); |
| } |
| |
| /** |
| * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Return true if the address is a multicast address. |
| * By definition the broadcast address is also a multicast address. |
| */ |
| static inline int is_multicast_ether_addr(const u8 *addr) |
| { |
| return (0x01 & addr[0]); |
| } |
| |
| /** |
| * is_local_ether_addr - Determine if the Ethernet address is locally-assigned |
| * one (IEEE 802). |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Return true if the address is a local address. |
| */ |
| static inline int is_local_ether_addr(const u8 *addr) |
| { |
| return (0x02 & addr[0]); |
| } |
| |
| /** |
| * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Return true if the address is the broadcast address. |
| */ |
| static inline int is_broadcast_ether_addr(const u8 *addr) |
| { |
| return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff; |
| } |
| |
| /** |
| * is_valid_ether_addr - Determine if the given Ethernet address is valid |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not |
| * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
| * |
| * Return true if the address is valid. |
| */ |
| static inline int is_valid_ether_addr(const u8 *addr) |
| { |
| /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to |
| * explicitly check for it here. */ |
| return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); |
| } |
| |
| /** |
| * random_ether_addr - Generate software assigned random Ethernet address |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Generate a random Ethernet address (MAC) that is not multicast |
| * and has the local assigned bit set. |
| */ |
| static inline void random_ether_addr(u8 *addr) |
| { |
| get_random_bytes (addr, ETH_ALEN); |
| addr [0] &= 0xfe; /* clear multicast bit */ |
| addr [0] |= 0x02; /* set local assignment bit (IEEE802) */ |
| } |
| |
| /** |
| * compare_ether_addr - Compare two Ethernet addresses |
| * @addr1: Pointer to a six-byte array containing the Ethernet address |
| * @addr2: Pointer other six-byte array containing the Ethernet address |
| * |
| * Compare two ethernet addresses, returns 0 if equal |
| */ |
| static inline unsigned compare_ether_addr(const u8 *addr1, const u8 *addr2) |
| { |
| const u16 *a = (const u16 *) addr1; |
| const u16 *b = (const u16 *) addr2; |
| |
| BUILD_BUG_ON(ETH_ALEN != 6); |
| return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0; |
| } |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _LINUX_ETHERDEVICE_H */ |