1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. NET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
7 * Definitions for the Ethernet handlers.
9 * Version: @(#)eth.h 1.0.4 05/13/93
12 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Relocated to include/linux where it belongs by Alan Cox
15 * <gw4pts@gw4pts.ampr.org>
17 #ifndef _LINUX_ETHERDEVICE_H
18 #define _LINUX_ETHERDEVICE_H
20 #include <linux/if_ether.h>
21 #include <linux/netdevice.h>
22 #include <linux/random.h>
23 #include <linux/crc32.h>
24 #include <asm/unaligned.h>
25 #include <asm/bitsperlong.h>
31 int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr);
32 unsigned char *arch_get_platform_mac_address(void);
33 int nvmem_get_mac_address(struct device *dev, void *addrbuf);
34 int device_get_mac_address(struct device *dev, char *addr);
35 int fwnode_get_mac_address(struct fwnode_handle *fwnode, char *addr);
37 u32 eth_get_headlen(const struct net_device *dev, const void *data, u32 len);
38 __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
39 extern const struct header_ops eth_header_ops;
41 int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
42 const void *daddr, const void *saddr, unsigned len);
43 int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
44 int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh,
46 void eth_header_cache_update(struct hh_cache *hh, const struct net_device *dev,
47 const unsigned char *haddr);
48 __be16 eth_header_parse_protocol(const struct sk_buff *skb);
49 int eth_prepare_mac_addr_change(struct net_device *dev, void *p);
50 void eth_commit_mac_addr_change(struct net_device *dev, void *p);
51 int eth_mac_addr(struct net_device *dev, void *p);
52 int eth_validate_addr(struct net_device *dev);
54 struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
56 #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)
57 #define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count)
59 struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv,
62 #define devm_alloc_etherdev(dev, sizeof_priv) devm_alloc_etherdev_mqs(dev, sizeof_priv, 1, 1)
64 struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb);
65 int eth_gro_complete(struct sk_buff *skb, int nhoff);
67 /* Reserved Ethernet Addresses per IEEE 802.1Q */
68 static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) =
69 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
70 #define eth_stp_addr eth_reserved_addr_base
73 * is_link_local_ether_addr - Determine if given Ethernet address is link-local
74 * @addr: Pointer to a six-byte array containing the Ethernet address
76 * Return true if address is link local reserved addr (01:80:c2:00:00:0X) per
77 * IEEE 802.1Q 8.6.3 Frame filtering.
79 * Please note: addr must be aligned to u16.
81 static inline bool is_link_local_ether_addr(const u8 *addr)
83 __be16 *a = (__be16 *)addr;
84 static const __be16 *b = (const __be16 *)eth_reserved_addr_base;
85 static const __be16 m = cpu_to_be16(0xfff0);
87 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
88 return (((*(const u32 *)addr) ^ (*(const u32 *)b)) |
89 (__force int)((a[2] ^ b[2]) & m)) == 0;
91 return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0;
96 * is_zero_ether_addr - Determine if give Ethernet address is all zeros.
97 * @addr: Pointer to a six-byte array containing the Ethernet address
99 * Return true if the address is all zeroes.
101 * Please note: addr must be aligned to u16.
103 static inline bool is_zero_ether_addr(const u8 *addr)
105 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
106 return ((*(const u32 *)addr) | (*(const u16 *)(addr + 4))) == 0;
108 return (*(const u16 *)(addr + 0) |
109 *(const u16 *)(addr + 2) |
110 *(const u16 *)(addr + 4)) == 0;
115 * is_multicast_ether_addr - Determine if the Ethernet address is a multicast.
116 * @addr: Pointer to a six-byte array containing the Ethernet address
118 * Return true if the address is a multicast address.
119 * By definition the broadcast address is also a multicast address.
121 static inline bool is_multicast_ether_addr(const u8 *addr)
123 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
124 u32 a = *(const u32 *)addr;
126 u16 a = *(const u16 *)addr;
129 return 0x01 & (a >> ((sizeof(a) * 8) - 8));
135 static inline bool is_multicast_ether_addr_64bits(const u8 addr[6+2])
137 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
139 return 0x01 & ((*(const u64 *)addr) >> 56);
141 return 0x01 & (*(const u64 *)addr);
144 return is_multicast_ether_addr(addr);
149 * is_local_ether_addr - Determine if the Ethernet address is locally-assigned one (IEEE 802).
150 * @addr: Pointer to a six-byte array containing the Ethernet address
152 * Return true if the address is a local address.
154 static inline bool is_local_ether_addr(const u8 *addr)
156 return 0x02 & addr[0];
160 * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast
161 * @addr: Pointer to a six-byte array containing the Ethernet address
163 * Return true if the address is the broadcast address.
165 * Please note: addr must be aligned to u16.
167 static inline bool is_broadcast_ether_addr(const u8 *addr)
169 return (*(const u16 *)(addr + 0) &
170 *(const u16 *)(addr + 2) &
171 *(const u16 *)(addr + 4)) == 0xffff;
175 * is_unicast_ether_addr - Determine if the Ethernet address is unicast
176 * @addr: Pointer to a six-byte array containing the Ethernet address
178 * Return true if the address is a unicast address.
180 static inline bool is_unicast_ether_addr(const u8 *addr)
182 return !is_multicast_ether_addr(addr);
186 * is_valid_ether_addr - Determine if the given Ethernet address is valid
187 * @addr: Pointer to a six-byte array containing the Ethernet address
189 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
190 * a multicast address, and is not FF:FF:FF:FF:FF:FF.
192 * Return true if the address is valid.
194 * Please note: addr must be aligned to u16.
196 static inline bool is_valid_ether_addr(const u8 *addr)
198 /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
199 * explicitly check for it here. */
200 return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
204 * eth_proto_is_802_3 - Determine if a given Ethertype/length is a protocol
205 * @proto: Ethertype/length value to be tested
207 * Check that the value from the Ethertype/length field is a valid Ethertype.
209 * Return true if the valid is an 802.3 supported Ethertype.
211 static inline bool eth_proto_is_802_3(__be16 proto)
214 /* if CPU is little endian mask off bits representing LSB */
215 proto &= htons(0xFF00);
217 /* cast both to u16 and compare since LSB can be ignored */
218 return (__force u16)proto >= (__force u16)htons(ETH_P_802_3_MIN);
222 * eth_random_addr - Generate software assigned random Ethernet address
223 * @addr: Pointer to a six-byte array containing the Ethernet address
225 * Generate a random Ethernet address (MAC) that is not multicast
226 * and has the local assigned bit set.
228 static inline void eth_random_addr(u8 *addr)
230 get_random_bytes(addr, ETH_ALEN);
231 addr[0] &= 0xfe; /* clear multicast bit */
232 addr[0] |= 0x02; /* set local assignment bit (IEEE802) */
235 #define random_ether_addr(addr) eth_random_addr(addr)
238 * eth_broadcast_addr - Assign broadcast address
239 * @addr: Pointer to a six-byte array containing the Ethernet address
241 * Assign the broadcast address to the given address array.
243 static inline void eth_broadcast_addr(u8 *addr)
245 memset(addr, 0xff, ETH_ALEN);
249 * eth_zero_addr - Assign zero address
250 * @addr: Pointer to a six-byte array containing the Ethernet address
252 * Assign the zero address to the given address array.
254 static inline void eth_zero_addr(u8 *addr)
256 memset(addr, 0x00, ETH_ALEN);
260 * eth_hw_addr_random - Generate software assigned random Ethernet and
262 * @dev: pointer to net_device structure
264 * Generate a random Ethernet address (MAC) to be used by a net device
265 * and set addr_assign_type so the state can be read by sysfs and be
268 static inline void eth_hw_addr_random(struct net_device *dev)
270 dev->addr_assign_type = NET_ADDR_RANDOM;
271 eth_random_addr(dev->dev_addr);
275 * eth_hw_addr_crc - Calculate CRC from netdev_hw_addr
276 * @ha: pointer to hardware address
278 * Calculate CRC from a hardware address as basis for filter hashes.
280 static inline u32 eth_hw_addr_crc(struct netdev_hw_addr *ha)
282 return ether_crc(ETH_ALEN, ha->addr);
286 * ether_addr_copy - Copy an Ethernet address
287 * @dst: Pointer to a six-byte array Ethernet address destination
288 * @src: Pointer to a six-byte array Ethernet address source
290 * Please note: dst & src must both be aligned to u16.
292 static inline void ether_addr_copy(u8 *dst, const u8 *src)
294 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
295 *(u32 *)dst = *(const u32 *)src;
296 *(u16 *)(dst + 4) = *(const u16 *)(src + 4);
299 const u16 *b = (const u16 *)src;
308 * eth_hw_addr_set - Assign Ethernet address to a net_device
309 * @dev: pointer to net_device structure
310 * @addr: address to assign
312 * Assign given address to the net_device, addr_assign_type is not changed.
314 static inline void eth_hw_addr_set(struct net_device *dev, const u8 *addr)
316 ether_addr_copy(dev->dev_addr, addr);
320 * eth_hw_addr_inherit - Copy dev_addr from another net_device
321 * @dst: pointer to net_device to copy dev_addr to
322 * @src: pointer to net_device to copy dev_addr from
324 * Copy the Ethernet address from one net_device to another along with
325 * the address attributes (addr_assign_type).
327 static inline void eth_hw_addr_inherit(struct net_device *dst,
328 struct net_device *src)
330 dst->addr_assign_type = src->addr_assign_type;
331 eth_hw_addr_set(dst, src->dev_addr);
335 * ether_addr_equal - Compare two Ethernet addresses
336 * @addr1: Pointer to a six-byte array containing the Ethernet address
337 * @addr2: Pointer other six-byte array containing the Ethernet address
339 * Compare two Ethernet addresses, returns true if equal
341 * Please note: addr1 & addr2 must both be aligned to u16.
343 static inline bool ether_addr_equal(const u8 *addr1, const u8 *addr2)
345 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
346 u32 fold = ((*(const u32 *)addr1) ^ (*(const u32 *)addr2)) |
347 ((*(const u16 *)(addr1 + 4)) ^ (*(const u16 *)(addr2 + 4)));
351 const u16 *a = (const u16 *)addr1;
352 const u16 *b = (const u16 *)addr2;
354 return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) == 0;
359 * ether_addr_equal_64bits - Compare two Ethernet addresses
360 * @addr1: Pointer to an array of 8 bytes
361 * @addr2: Pointer to an other array of 8 bytes
363 * Compare two Ethernet addresses, returns true if equal, false otherwise.
365 * The function doesn't need any conditional branches and possibly uses
366 * word memory accesses on CPU allowing cheap unaligned memory reads.
367 * arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 }
369 * Please note that alignment of addr1 & addr2 are only guaranteed to be 16 bits.
372 static inline bool ether_addr_equal_64bits(const u8 addr1[6+2],
375 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
376 u64 fold = (*(const u64 *)addr1) ^ (*(const u64 *)addr2);
379 return (fold >> 16) == 0;
381 return (fold << 16) == 0;
384 return ether_addr_equal(addr1, addr2);
389 * ether_addr_equal_unaligned - Compare two not u16 aligned Ethernet addresses
390 * @addr1: Pointer to a six-byte array containing the Ethernet address
391 * @addr2: Pointer other six-byte array containing the Ethernet address
393 * Compare two Ethernet addresses, returns true if equal
395 * Please note: Use only when any Ethernet address may not be u16 aligned.
397 static inline bool ether_addr_equal_unaligned(const u8 *addr1, const u8 *addr2)
399 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
400 return ether_addr_equal(addr1, addr2);
402 return memcmp(addr1, addr2, ETH_ALEN) == 0;
407 * ether_addr_equal_masked - Compare two Ethernet addresses with a mask
408 * @addr1: Pointer to a six-byte array containing the 1st Ethernet address
409 * @addr2: Pointer to a six-byte array containing the 2nd Ethernet address
410 * @mask: Pointer to a six-byte array containing the Ethernet address bitmask
412 * Compare two Ethernet addresses with a mask, returns true if for every bit
413 * set in the bitmask the equivalent bits in the ethernet addresses are equal.
414 * Using a mask with all bits set is a slower ether_addr_equal.
416 static inline bool ether_addr_equal_masked(const u8 *addr1, const u8 *addr2,
421 for (i = 0; i < ETH_ALEN; i++) {
422 if ((addr1[i] ^ addr2[i]) & mask[i])
430 * ether_addr_to_u64 - Convert an Ethernet address into a u64 value.
431 * @addr: Pointer to a six-byte array containing the Ethernet address
433 * Return a u64 value of the address
435 static inline u64 ether_addr_to_u64(const u8 *addr)
440 for (i = 0; i < ETH_ALEN; i++)
441 u = u << 8 | addr[i];
447 * u64_to_ether_addr - Convert a u64 to an Ethernet address.
448 * @u: u64 to convert to an Ethernet MAC address
449 * @addr: Pointer to a six-byte array to contain the Ethernet address
451 static inline void u64_to_ether_addr(u64 u, u8 *addr)
455 for (i = ETH_ALEN - 1; i >= 0; i--) {
462 * eth_addr_dec - Decrement the given MAC address
464 * @addr: Pointer to a six-byte array containing Ethernet address to decrement
466 static inline void eth_addr_dec(u8 *addr)
468 u64 u = ether_addr_to_u64(addr);
471 u64_to_ether_addr(u, addr);
475 * eth_addr_inc() - Increment the given MAC address.
476 * @addr: Pointer to a six-byte array containing Ethernet address to increment.
478 static inline void eth_addr_inc(u8 *addr)
480 u64 u = ether_addr_to_u64(addr);
483 u64_to_ether_addr(u, addr);
487 * is_etherdev_addr - Tell if given Ethernet address belongs to the device.
488 * @dev: Pointer to a device structure
489 * @addr: Pointer to a six-byte array containing the Ethernet address
491 * Compare passed address with all addresses of the device. Return true if the
492 * address if one of the device addresses.
494 * Note that this function calls ether_addr_equal_64bits() so take care of
497 static inline bool is_etherdev_addr(const struct net_device *dev,
498 const u8 addr[6 + 2])
500 struct netdev_hw_addr *ha;
504 for_each_dev_addr(dev, ha) {
505 res = ether_addr_equal_64bits(addr, ha->addr);
512 #endif /* __KERNEL__ */
515 * compare_ether_header - Compare two Ethernet headers
516 * @a: Pointer to Ethernet header
517 * @b: Pointer to Ethernet header
519 * Compare two Ethernet headers, returns 0 if equal.
520 * This assumes that the network header (i.e., IP header) is 4-byte
521 * aligned OR the platform can handle unaligned access. This is the
522 * case for all packets coming into netif_receive_skb or similar
526 static inline unsigned long compare_ether_header(const void *a, const void *b)
528 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
532 * We want to compare 14 bytes:
533 * [a0 ... a13] ^ [b0 ... b13]
534 * Use two long XOR, ORed together, with an overlap of two bytes.
535 * [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] |
536 * [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13]
537 * This means the [a6 a7] ^ [b6 b7] part is done two times.
539 fold = *(unsigned long *)a ^ *(unsigned long *)b;
540 fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6);
543 u32 *a32 = (u32 *)((u8 *)a + 2);
544 u32 *b32 = (u32 *)((u8 *)b + 2);
546 return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) |
547 (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]);
552 * eth_skb_pad - Pad buffer to mininum number of octets for Ethernet frame
553 * @skb: Buffer to pad
555 * An Ethernet frame should have a minimum size of 60 bytes. This function
556 * takes short frames and pads them with zeros up to the 60 byte limit.
558 static inline int eth_skb_pad(struct sk_buff *skb)
560 return skb_put_padto(skb, ETH_ZLEN);
563 #endif /* _LINUX_ETHERDEVICE_H */