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.
6 * Definitions for the Ethernet handlers.
8 * Version: @(#)eth.h 1.0.4 05/13/93
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
13 * Relocated to include/linux where it belongs by Alan Cox
14 * <gw4pts@gw4pts.ampr.org>
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.
22 #ifndef _LINUX_ETHERDEVICE_H
23 #define _LINUX_ETHERDEVICE_H
25 #include <linux/if_ether.h>
26 #include <linux/netdevice.h>
27 #include <linux/random.h>
28 #include <asm/unaligned.h>
29 #include <asm/bitsperlong.h>
32 u32
eth_get_headlen(void *data
, unsigned int max_len
);
33 __be16
eth_type_trans(struct sk_buff
*skb
, struct net_device
*dev
);
34 extern const struct header_ops eth_header_ops
;
36 int eth_header(struct sk_buff
*skb
, struct net_device
*dev
, unsigned short type
,
37 const void *daddr
, const void *saddr
, unsigned len
);
38 int eth_header_parse(const struct sk_buff
*skb
, unsigned char *haddr
);
39 int eth_header_cache(const struct neighbour
*neigh
, struct hh_cache
*hh
,
41 void eth_header_cache_update(struct hh_cache
*hh
, const struct net_device
*dev
,
42 const unsigned char *haddr
);
43 int eth_prepare_mac_addr_change(struct net_device
*dev
, void *p
);
44 void eth_commit_mac_addr_change(struct net_device
*dev
, void *p
);
45 int eth_mac_addr(struct net_device
*dev
, void *p
);
46 int eth_change_mtu(struct net_device
*dev
, int new_mtu
);
47 int eth_validate_addr(struct net_device
*dev
);
49 struct net_device
*alloc_etherdev_mqs(int sizeof_priv
, unsigned int txqs
,
51 #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)
52 #define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count)
54 struct sk_buff
**eth_gro_receive(struct sk_buff
**head
,
56 int eth_gro_complete(struct sk_buff
*skb
, int nhoff
);
58 /* Reserved Ethernet Addresses per IEEE 802.1Q */
59 static const u8 eth_reserved_addr_base
[ETH_ALEN
] __aligned(2) =
60 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
63 * is_link_local_ether_addr - Determine if given Ethernet address is link-local
64 * @addr: Pointer to a six-byte array containing the Ethernet address
66 * Return true if address is link local reserved addr (01:80:c2:00:00:0X) per
67 * IEEE 802.1Q 8.6.3 Frame filtering.
69 * Please note: addr must be aligned to u16.
71 static inline bool is_link_local_ether_addr(const u8
*addr
)
73 __be16
*a
= (__be16
*)addr
;
74 static const __be16
*b
= (const __be16
*)eth_reserved_addr_base
;
75 static const __be16 m
= cpu_to_be16(0xfff0);
77 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
78 return (((*(const u32
*)addr
) ^ (*(const u32
*)b
)) |
79 (__force
int)((a
[2] ^ b
[2]) & m
)) == 0;
81 return ((a
[0] ^ b
[0]) | (a
[1] ^ b
[1]) | ((a
[2] ^ b
[2]) & m
)) == 0;
86 * is_zero_ether_addr - Determine if give Ethernet address is all zeros.
87 * @addr: Pointer to a six-byte array containing the Ethernet address
89 * Return true if the address is all zeroes.
91 * Please note: addr must be aligned to u16.
93 static inline bool is_zero_ether_addr(const u8
*addr
)
95 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
96 return ((*(const u32
*)addr
) | (*(const u16
*)(addr
+ 4))) == 0;
98 return (*(const u16
*)(addr
+ 0) |
99 *(const u16
*)(addr
+ 2) |
100 *(const u16
*)(addr
+ 4)) == 0;
105 * is_multicast_ether_addr - Determine if the Ethernet address is a multicast.
106 * @addr: Pointer to a six-byte array containing the Ethernet address
108 * Return true if the address is a multicast address.
109 * By definition the broadcast address is also a multicast address.
111 static inline bool is_multicast_ether_addr(const u8
*addr
)
113 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
114 u32 a
= *(const u32
*)addr
;
116 u16 a
= *(const u16
*)addr
;
119 return 0x01 & (a
>> ((sizeof(a
) * 8) - 8));
125 static inline bool is_multicast_ether_addr_64bits(const u8 addr
[6+2])
127 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
129 return 0x01 & ((*(const u64
*)addr
) >> 56);
131 return 0x01 & (*(const u64
*)addr
);
134 return is_multicast_ether_addr(addr
);
139 * is_local_ether_addr - Determine if the Ethernet address is locally-assigned one (IEEE 802).
140 * @addr: Pointer to a six-byte array containing the Ethernet address
142 * Return true if the address is a local address.
144 static inline bool is_local_ether_addr(const u8
*addr
)
146 return 0x02 & addr
[0];
150 * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast
151 * @addr: Pointer to a six-byte array containing the Ethernet address
153 * Return true if the address is the broadcast address.
155 * Please note: addr must be aligned to u16.
157 static inline bool is_broadcast_ether_addr(const u8
*addr
)
159 return (*(const u16
*)(addr
+ 0) &
160 *(const u16
*)(addr
+ 2) &
161 *(const u16
*)(addr
+ 4)) == 0xffff;
165 * is_unicast_ether_addr - Determine if the Ethernet address is unicast
166 * @addr: Pointer to a six-byte array containing the Ethernet address
168 * Return true if the address is a unicast address.
170 static inline bool is_unicast_ether_addr(const u8
*addr
)
172 return !is_multicast_ether_addr(addr
);
176 * is_valid_ether_addr - Determine if the given Ethernet address is valid
177 * @addr: Pointer to a six-byte array containing the Ethernet address
179 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
180 * a multicast address, and is not FF:FF:FF:FF:FF:FF.
182 * Return true if the address is valid.
184 * Please note: addr must be aligned to u16.
186 static inline bool is_valid_ether_addr(const u8
*addr
)
188 /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
189 * explicitly check for it here. */
190 return !is_multicast_ether_addr(addr
) && !is_zero_ether_addr(addr
);
194 * eth_proto_is_802_3 - Determine if a given Ethertype/length is a protocol
195 * @proto: Ethertype/length value to be tested
197 * Check that the value from the Ethertype/length field is a valid Ethertype.
199 * Return true if the valid is an 802.3 supported Ethertype.
201 static inline bool eth_proto_is_802_3(__be16 proto
)
204 /* if CPU is little endian mask off bits representing LSB */
205 proto
&= htons(0xFF00);
207 /* cast both to u16 and compare since LSB can be ignored */
208 return (__force u16
)proto
>= (__force u16
)htons(ETH_P_802_3_MIN
);
212 * eth_random_addr - Generate software assigned random Ethernet address
213 * @addr: Pointer to a six-byte array containing the Ethernet address
215 * Generate a random Ethernet address (MAC) that is not multicast
216 * and has the local assigned bit set.
218 static inline void eth_random_addr(u8
*addr
)
220 get_random_bytes(addr
, ETH_ALEN
);
221 addr
[0] &= 0xfe; /* clear multicast bit */
222 addr
[0] |= 0x02; /* set local assignment bit (IEEE802) */
225 #define random_ether_addr(addr) eth_random_addr(addr)
228 * eth_broadcast_addr - Assign broadcast address
229 * @addr: Pointer to a six-byte array containing the Ethernet address
231 * Assign the broadcast address to the given address array.
233 static inline void eth_broadcast_addr(u8
*addr
)
235 memset(addr
, 0xff, ETH_ALEN
);
239 * eth_zero_addr - Assign zero address
240 * @addr: Pointer to a six-byte array containing the Ethernet address
242 * Assign the zero address to the given address array.
244 static inline void eth_zero_addr(u8
*addr
)
246 memset(addr
, 0x00, ETH_ALEN
);
250 * eth_hw_addr_random - Generate software assigned random Ethernet and
252 * @dev: pointer to net_device structure
254 * Generate a random Ethernet address (MAC) to be used by a net device
255 * and set addr_assign_type so the state can be read by sysfs and be
258 static inline void eth_hw_addr_random(struct net_device
*dev
)
260 dev
->addr_assign_type
= NET_ADDR_RANDOM
;
261 eth_random_addr(dev
->dev_addr
);
265 * ether_addr_copy - Copy an Ethernet address
266 * @dst: Pointer to a six-byte array Ethernet address destination
267 * @src: Pointer to a six-byte array Ethernet address source
269 * Please note: dst & src must both be aligned to u16.
271 static inline void ether_addr_copy(u8
*dst
, const u8
*src
)
273 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
274 *(u32
*)dst
= *(const u32
*)src
;
275 *(u16
*)(dst
+ 4) = *(const u16
*)(src
+ 4);
278 const u16
*b
= (const u16
*)src
;
287 * eth_hw_addr_inherit - Copy dev_addr from another net_device
288 * @dst: pointer to net_device to copy dev_addr to
289 * @src: pointer to net_device to copy dev_addr from
291 * Copy the Ethernet address from one net_device to another along with
292 * the address attributes (addr_assign_type).
294 static inline void eth_hw_addr_inherit(struct net_device
*dst
,
295 struct net_device
*src
)
297 dst
->addr_assign_type
= src
->addr_assign_type
;
298 ether_addr_copy(dst
->dev_addr
, src
->dev_addr
);
302 * ether_addr_equal - Compare two Ethernet addresses
303 * @addr1: Pointer to a six-byte array containing the Ethernet address
304 * @addr2: Pointer other six-byte array containing the Ethernet address
306 * Compare two Ethernet addresses, returns true if equal
308 * Please note: addr1 & addr2 must both be aligned to u16.
310 static inline bool ether_addr_equal(const u8
*addr1
, const u8
*addr2
)
312 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
313 u32 fold
= ((*(const u32
*)addr1
) ^ (*(const u32
*)addr2
)) |
314 ((*(const u16
*)(addr1
+ 4)) ^ (*(const u16
*)(addr2
+ 4)));
318 const u16
*a
= (const u16
*)addr1
;
319 const u16
*b
= (const u16
*)addr2
;
321 return ((a
[0] ^ b
[0]) | (a
[1] ^ b
[1]) | (a
[2] ^ b
[2])) == 0;
326 * ether_addr_equal_64bits - Compare two Ethernet addresses
327 * @addr1: Pointer to an array of 8 bytes
328 * @addr2: Pointer to an other array of 8 bytes
330 * Compare two Ethernet addresses, returns true if equal, false otherwise.
332 * The function doesn't need any conditional branches and possibly uses
333 * word memory accesses on CPU allowing cheap unaligned memory reads.
334 * arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 }
336 * Please note that alignment of addr1 & addr2 are only guaranteed to be 16 bits.
339 static inline bool ether_addr_equal_64bits(const u8 addr1
[6+2],
342 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
343 u64 fold
= (*(const u64
*)addr1
) ^ (*(const u64
*)addr2
);
346 return (fold
>> 16) == 0;
348 return (fold
<< 16) == 0;
351 return ether_addr_equal(addr1
, addr2
);
356 * ether_addr_equal_unaligned - Compare two not u16 aligned Ethernet addresses
357 * @addr1: Pointer to a six-byte array containing the Ethernet address
358 * @addr2: Pointer other six-byte array containing the Ethernet address
360 * Compare two Ethernet addresses, returns true if equal
362 * Please note: Use only when any Ethernet address may not be u16 aligned.
364 static inline bool ether_addr_equal_unaligned(const u8
*addr1
, const u8
*addr2
)
366 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
367 return ether_addr_equal(addr1
, addr2
);
369 return memcmp(addr1
, addr2
, ETH_ALEN
) == 0;
374 * is_etherdev_addr - Tell if given Ethernet address belongs to the device.
375 * @dev: Pointer to a device structure
376 * @addr: Pointer to a six-byte array containing the Ethernet address
378 * Compare passed address with all addresses of the device. Return true if the
379 * address if one of the device addresses.
381 * Note that this function calls ether_addr_equal_64bits() so take care of
384 static inline bool is_etherdev_addr(const struct net_device
*dev
,
385 const u8 addr
[6 + 2])
387 struct netdev_hw_addr
*ha
;
391 for_each_dev_addr(dev
, ha
) {
392 res
= ether_addr_equal_64bits(addr
, ha
->addr
);
399 #endif /* __KERNEL__ */
402 * compare_ether_header - Compare two Ethernet headers
403 * @a: Pointer to Ethernet header
404 * @b: Pointer to Ethernet header
406 * Compare two Ethernet headers, returns 0 if equal.
407 * This assumes that the network header (i.e., IP header) is 4-byte
408 * aligned OR the platform can handle unaligned access. This is the
409 * case for all packets coming into netif_receive_skb or similar
413 static inline unsigned long compare_ether_header(const void *a
, const void *b
)
415 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
419 * We want to compare 14 bytes:
420 * [a0 ... a13] ^ [b0 ... b13]
421 * Use two long XOR, ORed together, with an overlap of two bytes.
422 * [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] |
423 * [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13]
424 * This means the [a6 a7] ^ [b6 b7] part is done two times.
426 fold
= *(unsigned long *)a
^ *(unsigned long *)b
;
427 fold
|= *(unsigned long *)(a
+ 6) ^ *(unsigned long *)(b
+ 6);
430 u32
*a32
= (u32
*)((u8
*)a
+ 2);
431 u32
*b32
= (u32
*)((u8
*)b
+ 2);
433 return (*(u16
*)a
^ *(u16
*)b
) | (a32
[0] ^ b32
[0]) |
434 (a32
[1] ^ b32
[1]) | (a32
[2] ^ b32
[2]);
439 * eth_skb_pad - Pad buffer to mininum number of octets for Ethernet frame
440 * @skb: Buffer to pad
442 * An Ethernet frame should have a minimum size of 60 bytes. This function
443 * takes short frames and pads them with zeros up to the 60 byte limit.
445 static inline int eth_skb_pad(struct sk_buff
*skb
)
447 return skb_put_padto(skb
, ETH_ZLEN
);
450 #endif /* _LINUX_ETHERDEVICE_H */