335 lines
10 KiB
C
335 lines
10 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. NET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the Ethernet handlers.
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*
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* Version: @(#)eth.h 1.0.4 05/13/93
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* Relocated to include/linux where it belongs by Alan Cox
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* <gw4pts@gw4pts.ampr.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#ifndef _LINUX_ETHERDEVICE_H
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#define _LINUX_ETHERDEVICE_H
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#include <linux/if_ether.h>
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#include <linux/netdevice.h>
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#include <linux/random.h>
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#include <asm/unaligned.h>
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#ifdef __KERNEL__
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extern __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
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extern const struct header_ops eth_header_ops;
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extern int eth_header(struct sk_buff *skb, struct net_device *dev,
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unsigned short type,
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const void *daddr, const void *saddr, unsigned len);
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extern int eth_rebuild_header(struct sk_buff *skb);
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extern int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
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extern int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
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extern void eth_header_cache_update(struct hh_cache *hh,
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const struct net_device *dev,
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const unsigned char *haddr);
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extern int eth_mac_addr(struct net_device *dev, void *p);
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extern int eth_change_mtu(struct net_device *dev, int new_mtu);
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extern int eth_validate_addr(struct net_device *dev);
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extern struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
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unsigned int rxqs);
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#define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)
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#define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count)
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/* Reserved Ethernet Addresses per IEEE 802.1Q */
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static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) =
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{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
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/**
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* is_link_local_ether_addr - Determine if given Ethernet address is link-local
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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 address is link local reserved addr (01:80:c2:00:00:0X) per
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* IEEE 802.1Q 8.6.3 Frame filtering.
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*/
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static inline bool is_link_local_ether_addr(const u8 *addr)
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{
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__be16 *a = (__be16 *)addr;
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static const __be16 *b = (const __be16 *)eth_reserved_addr_base;
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static const __be16 m = cpu_to_be16(0xfff0);
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return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0;
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}
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/**
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* is_zero_ether_addr - Determine if give Ethernet address is all zeros.
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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 all zeroes.
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*/
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static inline bool is_zero_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]);
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}
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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 bool 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 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 bool 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 bool 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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* is_unicast_ether_addr - Determine if the Ethernet address is unicast
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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 unicast address.
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*/
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static inline bool is_unicast_ether_addr(const u8 *addr)
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{
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return !is_multicast_ether_addr(addr);
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}
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/**
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* is_valid_ether_addr - Determine if the given Ethernet address is valid
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
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* a multicast address, and is not FF:FF:FF:FF:FF:FF.
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*
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* Return true if the address is valid.
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*/
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static inline bool is_valid_ether_addr(const u8 *addr)
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{
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/* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
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* explicitly check for it here. */
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return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
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}
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/**
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* eth_random_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 eth_random_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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#define random_ether_addr(addr) eth_random_addr(addr)
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/**
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* eth_broadcast_addr - Assign broadcast address
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Assign the broadcast address to the given address array.
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*/
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static inline void eth_broadcast_addr(u8 *addr)
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{
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memset(addr, 0xff, ETH_ALEN);
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}
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/**
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* eth_zero_addr - Assign zero address
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Assign the zero address to the given address array.
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*/
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static inline void eth_zero_addr(u8 *addr)
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{
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memset(addr, 0x00, ETH_ALEN);
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}
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/**
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* eth_hw_addr_random - Generate software assigned random Ethernet and
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* set device flag
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* @dev: pointer to net_device structure
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*
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* Generate a random Ethernet address (MAC) to be used by a net device
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* and set addr_assign_type so the state can be read by sysfs and be
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* used by userspace.
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*/
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static inline void eth_hw_addr_random(struct net_device *dev)
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{
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dev->addr_assign_type |= NET_ADDR_RANDOM;
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eth_random_addr(dev->dev_addr);
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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, non-zero otherwise.
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* Unlike memcmp(), it doesn't return a value suitable for sorting.
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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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BUILD_BUG_ON(ETH_ALEN != 6);
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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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/**
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* ether_addr_equal - 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 true if equal
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*/
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static inline bool ether_addr_equal(const u8 *addr1, const u8 *addr2)
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{
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return !compare_ether_addr(addr1, addr2);
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}
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static inline unsigned long zap_last_2bytes(unsigned long value)
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{
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#ifdef __BIG_ENDIAN
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return value >> 16;
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#else
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return value << 16;
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#endif
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}
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/**
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* ether_addr_equal_64bits - Compare two Ethernet addresses
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* @addr1: Pointer to an array of 8 bytes
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* @addr2: Pointer to an other array of 8 bytes
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*
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* Compare two Ethernet addresses, returns true if equal, false otherwise.
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*
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* The function doesn't need any conditional branches and possibly uses
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* word memory accesses on CPU allowing cheap unaligned memory reads.
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* arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 }
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*
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* Please note that alignment of addr1 & addr2 are only guaranteed to be 16 bits.
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*/
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static inline bool ether_addr_equal_64bits(const u8 addr1[6+2],
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const u8 addr2[6+2])
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{
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#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
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unsigned long fold = ((*(unsigned long *)addr1) ^
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(*(unsigned long *)addr2));
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if (sizeof(fold) == 8)
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return zap_last_2bytes(fold) == 0;
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fold |= zap_last_2bytes((*(unsigned long *)(addr1 + 4)) ^
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(*(unsigned long *)(addr2 + 4)));
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return fold == 0;
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#else
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return ether_addr_equal(addr1, addr2);
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#endif
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}
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/**
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* is_etherdev_addr - Tell if given Ethernet address belongs to the device.
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* @dev: Pointer to a device structure
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Compare passed address with all addresses of the device. Return true if the
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* address if one of the device addresses.
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*
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* Note that this function calls ether_addr_equal_64bits() so take care of
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* the right padding.
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*/
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static inline bool is_etherdev_addr(const struct net_device *dev,
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const u8 addr[6 + 2])
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{
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struct netdev_hw_addr *ha;
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bool res = false;
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rcu_read_lock();
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for_each_dev_addr(dev, ha) {
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res = ether_addr_equal_64bits(addr, ha->addr);
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if (res)
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break;
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}
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rcu_read_unlock();
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return res;
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}
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#endif /* __KERNEL__ */
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/**
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* compare_ether_header - Compare two Ethernet headers
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* @a: Pointer to Ethernet header
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* @b: Pointer to Ethernet header
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*
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* Compare two Ethernet headers, returns 0 if equal.
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* This assumes that the network header (i.e., IP header) is 4-byte
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* aligned OR the platform can handle unaligned access. This is the
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* case for all packets coming into netif_receive_skb or similar
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* entry points.
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*/
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static inline unsigned long compare_ether_header(const void *a, const void *b)
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{
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
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unsigned long fold;
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/*
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* We want to compare 14 bytes:
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* [a0 ... a13] ^ [b0 ... b13]
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* Use two long XOR, ORed together, with an overlap of two bytes.
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* [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] |
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* [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13]
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* This means the [a6 a7] ^ [b6 b7] part is done two times.
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*/
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fold = *(unsigned long *)a ^ *(unsigned long *)b;
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fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6);
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return fold;
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#else
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u32 *a32 = (u32 *)((u8 *)a + 2);
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u32 *b32 = (u32 *)((u8 *)b + 2);
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return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) |
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(a32[1] ^ b32[1]) | (a32[2] ^ b32[2]);
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#endif
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}
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#endif /* _LINUX_ETHERDEVICE_H */
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