72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
#ifndef __LINUX_ETHERDEVICE_WRAPPER_H
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#define __LINUX_ETHERDEVICE_WRAPPER_H 1
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#include_next <linux/etherdevice.h>
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#include <linux/random.h>
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/**
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* is_multicast_ether_addr - Determine if the Ethernet address is a multicast.
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Return true if the address is a multicast address.
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* By definition the broadcast address is also a multicast address.
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*/
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static inline int is_multicast_ether_addr(const u8 *addr)
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{
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return (0x01 & addr[0]);
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}
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/**
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* is_local_ether_addr - Determine if the Ethernet address is locally-assigned
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* one (IEEE 802).
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Return true if the address is a local address.
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*/
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static inline int is_local_ether_addr(const u8 *addr)
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{
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return (0x02 & addr[0]);
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}
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/**
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* is_broadcast_ether_addr - Determine if the Ethernet address is broadcast
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Return true if the address is the broadcast address.
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*/
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static inline int is_broadcast_ether_addr(const u8 *addr)
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{
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return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff;
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}
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/**
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* random_ether_addr - Generate software assigned random Ethernet address
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Generate a random Ethernet address (MAC) that is not multicast
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* and has the local assigned bit set.
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*/
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static inline void random_ether_addr(u8 *addr)
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{
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get_random_bytes (addr, ETH_ALEN);
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addr [0] &= 0xfe; /* clear multicast bit */
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addr [0] |= 0x02; /* set local assignment bit (IEEE802) */
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}
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/**
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* compare_ether_addr - Compare two Ethernet addresses
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* @addr1: Pointer to a six-byte array containing the Ethernet address
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* @addr2: Pointer other six-byte array containing the Ethernet address
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*
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* Compare two ethernet addresses, returns 0 if equal
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*/
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static inline unsigned compare_ether_addr(const u8 *addr1, const u8 *addr2)
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{
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const u16 *a = (const u16 *) addr1;
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const u16 *b = (const u16 *) addr2;
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return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0;
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}
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#endif
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