279 lines
8.7 KiB
C
279 lines
8.7 KiB
C
/*
|
|
* 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>
|
|
#include <asm/unaligned.h>
|
|
|
|
#ifdef __KERNEL__
|
|
extern __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
|
|
extern const struct header_ops eth_header_ops;
|
|
|
|
extern int eth_header(struct sk_buff *skb, struct net_device *dev,
|
|
unsigned short type,
|
|
const void *daddr, const void *saddr, unsigned len);
|
|
extern int eth_rebuild_header(struct sk_buff *skb);
|
|
extern int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
|
|
extern int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh);
|
|
extern void eth_header_cache_update(struct hh_cache *hh,
|
|
const struct net_device *dev,
|
|
const unsigned char *haddr);
|
|
extern int eth_mac_addr(struct net_device *dev, void *p);
|
|
extern int eth_change_mtu(struct net_device *dev, int new_mtu);
|
|
extern int eth_validate_addr(struct net_device *dev);
|
|
|
|
|
|
|
|
extern struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
|
|
unsigned int rxqs);
|
|
#define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)
|
|
#define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count)
|
|
|
|
/**
|
|
* 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_unicast_ether_addr - Determine if the Ethernet address is unicast
|
|
* @addr: Pointer to a six-byte array containing the Ethernet address
|
|
*
|
|
* Return true if the address is a unicast address.
|
|
*/
|
|
static inline int is_unicast_ether_addr(const u8 *addr)
|
|
{
|
|
return !is_multicast_ether_addr(addr);
|
|
}
|
|
|
|
/**
|
|
* 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) */
|
|
}
|
|
|
|
/**
|
|
* dev_hw_addr_random - Create random MAC and set device flag
|
|
* @dev: pointer to net_device structure
|
|
* @hwaddr: Pointer to a six-byte array containing the Ethernet address
|
|
*
|
|
* Generate random MAC to be used by a device and set addr_assign_type
|
|
* so the state can be read by sysfs and be used by udev.
|
|
*/
|
|
static inline void dev_hw_addr_random(struct net_device *dev, u8 *hwaddr)
|
|
{
|
|
dev->addr_assign_type |= NET_ADDR_RANDOM;
|
|
random_ether_addr(hwaddr);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
static inline unsigned long zap_last_2bytes(unsigned long value)
|
|
{
|
|
#ifdef __BIG_ENDIAN
|
|
return value >> 16;
|
|
#else
|
|
return value << 16;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* compare_ether_addr_64bits - Compare two Ethernet addresses
|
|
* @addr1: Pointer to an array of 8 bytes
|
|
* @addr2: Pointer to an other array of 8 bytes
|
|
*
|
|
* Compare two ethernet addresses, returns 0 if equal.
|
|
* Same result than "memcmp(addr1, addr2, ETH_ALEN)" but without conditional
|
|
* branches, and possibly long word memory accesses on CPU allowing cheap
|
|
* unaligned memory reads.
|
|
* arrays = { byte1, byte2, byte3, byte4, byte6, byte7, pad1, pad2}
|
|
*
|
|
* Please note that alignment of addr1 & addr2 is only guaranted to be 16 bits.
|
|
*/
|
|
|
|
static inline unsigned compare_ether_addr_64bits(const u8 addr1[6+2],
|
|
const u8 addr2[6+2])
|
|
{
|
|
#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
|
|
unsigned long fold = ((*(unsigned long *)addr1) ^
|
|
(*(unsigned long *)addr2));
|
|
|
|
if (sizeof(fold) == 8)
|
|
return zap_last_2bytes(fold) != 0;
|
|
|
|
fold |= zap_last_2bytes((*(unsigned long *)(addr1 + 4)) ^
|
|
(*(unsigned long *)(addr2 + 4)));
|
|
return fold != 0;
|
|
#else
|
|
return compare_ether_addr(addr1, addr2);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* is_etherdev_addr - Tell if given Ethernet address belongs to the device.
|
|
* @dev: Pointer to a device structure
|
|
* @addr: Pointer to a six-byte array containing the Ethernet address
|
|
*
|
|
* Compare passed address with all addresses of the device. Return true if the
|
|
* address if one of the device addresses.
|
|
*
|
|
* Note that this function calls compare_ether_addr_64bits() so take care of
|
|
* the right padding.
|
|
*/
|
|
static inline bool is_etherdev_addr(const struct net_device *dev,
|
|
const u8 addr[6 + 2])
|
|
{
|
|
struct netdev_hw_addr *ha;
|
|
int res = 1;
|
|
|
|
rcu_read_lock();
|
|
for_each_dev_addr(dev, ha) {
|
|
res = compare_ether_addr_64bits(addr, ha->addr);
|
|
if (!res)
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
return !res;
|
|
}
|
|
#endif /* __KERNEL__ */
|
|
|
|
/**
|
|
* compare_ether_header - Compare two Ethernet headers
|
|
* @a: Pointer to Ethernet header
|
|
* @b: Pointer to Ethernet header
|
|
*
|
|
* Compare two ethernet headers, returns 0 if equal.
|
|
* This assumes that the network header (i.e., IP header) is 4-byte
|
|
* aligned OR the platform can handle unaligned access. This is the
|
|
* case for all packets coming into netif_receive_skb or similar
|
|
* entry points.
|
|
*/
|
|
|
|
static inline unsigned long compare_ether_header(const void *a, const void *b)
|
|
{
|
|
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
|
|
unsigned long fold;
|
|
|
|
/*
|
|
* We want to compare 14 bytes:
|
|
* [a0 ... a13] ^ [b0 ... b13]
|
|
* Use two long XOR, ORed together, with an overlap of two bytes.
|
|
* [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] |
|
|
* [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13]
|
|
* This means the [a6 a7] ^ [b6 b7] part is done two times.
|
|
*/
|
|
fold = *(unsigned long *)a ^ *(unsigned long *)b;
|
|
fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6);
|
|
return fold;
|
|
#else
|
|
u32 *a32 = (u32 *)((u8 *)a + 2);
|
|
u32 *b32 = (u32 *)((u8 *)b + 2);
|
|
|
|
return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) |
|
|
(a32[1] ^ b32[1]) | (a32[2] ^ b32[2]);
|
|
#endif
|
|
}
|
|
|
|
#endif /* _LINUX_ETHERDEVICE_H */
|