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1da177e4 LT |
1 | /* |
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. | |
5 | * | |
6 | * Definitions for the Ethernet handlers. | |
7 | * | |
8 | * Version: @(#)eth.h 1.0.4 05/13/93 | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * | |
13 | * Relocated to include/linux where it belongs by Alan Cox | |
14 | * <gw4pts@gw4pts.ampr.org> | |
15 | * | |
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. | |
20 | * | |
1da177e4 LT |
21 | */ |
22 | #ifndef _LINUX_ETHERDEVICE_H | |
23 | #define _LINUX_ETHERDEVICE_H | |
24 | ||
25 | #include <linux/if_ether.h> | |
bcd61272 | 26 | #include <linux/netdevice.h> |
1da177e4 | 27 | #include <linux/random.h> |
1f87e235 | 28 | #include <asm/unaligned.h> |
0d74c42f | 29 | #include <asm/bitsperlong.h> |
1da177e4 LT |
30 | |
31 | #ifdef __KERNEL__ | |
c7f5d105 DM |
32 | struct device; |
33 | int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr); | |
e728789c | 34 | unsigned char *arch_get_platform_mac_address(void); |
0e839df9 | 35 | int nvmem_get_mac_address(struct device *dev, void *addrbuf); |
c43f1255 | 36 | u32 eth_get_headlen(const struct net_device *dev, void *data, unsigned int len); |
f629d208 | 37 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev); |
3b04ddde SH |
38 | extern const struct header_ops eth_header_ops; |
39 | ||
f629d208 JP |
40 | int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, |
41 | const void *daddr, const void *saddr, unsigned len); | |
f629d208 JP |
42 | int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr); |
43 | int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, | |
44 | __be16 type); | |
45 | void eth_header_cache_update(struct hh_cache *hh, const struct net_device *dev, | |
46 | const unsigned char *haddr); | |
ace53b2e | 47 | __be16 eth_header_parse_protocol(const struct sk_buff *skb); |
f629d208 JP |
48 | int eth_prepare_mac_addr_change(struct net_device *dev, void *p); |
49 | void eth_commit_mac_addr_change(struct net_device *dev, void *p); | |
50 | int eth_mac_addr(struct net_device *dev, void *p); | |
51 | int eth_change_mtu(struct net_device *dev, int new_mtu); | |
52 | int eth_validate_addr(struct net_device *dev); | |
ccad637b | 53 | |
f629d208 | 54 | struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, |
36909ea4 | 55 | unsigned int rxqs); |
f25f4e44 | 56 | #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1) |
36909ea4 | 57 | #define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count) |
1da177e4 | 58 | |
40be0dda RM |
59 | struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv, |
60 | unsigned int txqs, | |
61 | unsigned int rxqs); | |
62 | #define devm_alloc_etherdev(dev, sizeof_priv) devm_alloc_etherdev_mqs(dev, sizeof_priv, 1, 1) | |
63 | ||
d4546c25 | 64 | struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb); |
9b174d88 JG |
65 | int eth_gro_complete(struct sk_buff *skb, int nhoff); |
66 | ||
b3343a2a | 67 | /* Reserved Ethernet Addresses per IEEE 802.1Q */ |
2bc80059 BH |
68 | static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) = |
69 | { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; | |
05428729 | 70 | #define eth_stp_addr eth_reserved_addr_base |
b3343a2a JF |
71 | |
72 | /** | |
46acc460 | 73 | * is_link_local_ether_addr - Determine if given Ethernet address is link-local |
b3343a2a JF |
74 | * @addr: Pointer to a six-byte array containing the Ethernet address |
75 | * | |
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. | |
2c722fe1 JP |
78 | * |
79 | * Please note: addr must be aligned to u16. | |
b3343a2a | 80 | */ |
46acc460 | 81 | static inline bool is_link_local_ether_addr(const u8 *addr) |
b3343a2a | 82 | { |
46acc460 | 83 | __be16 *a = (__be16 *)addr; |
2bc80059 | 84 | static const __be16 *b = (const __be16 *)eth_reserved_addr_base; |
b3343a2a JF |
85 | static const __be16 m = cpu_to_be16(0xfff0); |
86 | ||
2c722fe1 JP |
87 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
88 | return (((*(const u32 *)addr) ^ (*(const u32 *)b)) | | |
fbaff3ef | 89 | (__force int)((a[2] ^ b[2]) & m)) == 0; |
2c722fe1 | 90 | #else |
b3343a2a | 91 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0; |
2c722fe1 | 92 | #endif |
b3343a2a JF |
93 | } |
94 | ||
1da177e4 | 95 | /** |
c2da8aca SH |
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 | |
98 | * | |
99 | * Return true if the address is all zeroes. | |
2c722fe1 JP |
100 | * |
101 | * Please note: addr must be aligned to u16. | |
1da177e4 | 102 | */ |
b44907e6 | 103 | static inline bool is_zero_ether_addr(const u8 *addr) |
1da177e4 | 104 | { |
2c722fe1 JP |
105 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
106 | return ((*(const u32 *)addr) | (*(const u16 *)(addr + 4))) == 0; | |
107 | #else | |
108 | return (*(const u16 *)(addr + 0) | | |
109 | *(const u16 *)(addr + 2) | | |
110 | *(const u16 *)(addr + 4)) == 0; | |
111 | #endif | |
1da177e4 LT |
112 | } |
113 | ||
79165121 | 114 | /** |
c2da8aca | 115 | * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. |
79165121 ME |
116 | * @addr: Pointer to a six-byte array containing the Ethernet address |
117 | * | |
118 | * Return true if the address is a multicast address. | |
88df8ef5 | 119 | * By definition the broadcast address is also a multicast address. |
79165121 | 120 | */ |
b44907e6 | 121 | static inline bool is_multicast_ether_addr(const u8 *addr) |
79165121 | 122 | { |
d54385ce AD |
123 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
124 | u32 a = *(const u32 *)addr; | |
125 | #else | |
126 | u16 a = *(const u16 *)addr; | |
127 | #endif | |
128 | #ifdef __BIG_ENDIAN | |
129 | return 0x01 & (a >> ((sizeof(a) * 8) - 8)); | |
130 | #else | |
131 | return 0x01 & a; | |
132 | #endif | |
133 | } | |
134 | ||
135 | static inline bool is_multicast_ether_addr_64bits(const u8 addr[6+2]) | |
136 | { | |
137 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 | |
138 | #ifdef __BIG_ENDIAN | |
139 | return 0x01 & ((*(const u64 *)addr) >> 56); | |
140 | #else | |
141 | return 0x01 & (*(const u64 *)addr); | |
142 | #endif | |
143 | #else | |
144 | return is_multicast_ether_addr(addr); | |
145 | #endif | |
79165121 ME |
146 | } |
147 | ||
e024715f | 148 | /** |
bc2cda1e | 149 | * is_local_ether_addr - Determine if the Ethernet address is locally-assigned one (IEEE 802). |
e024715f PBG |
150 | * @addr: Pointer to a six-byte array containing the Ethernet address |
151 | * | |
152 | * Return true if the address is a local address. | |
153 | */ | |
b44907e6 | 154 | static inline bool is_local_ether_addr(const u8 *addr) |
e024715f | 155 | { |
a02cec21 | 156 | return 0x02 & addr[0]; |
e024715f PBG |
157 | } |
158 | ||
c2da8aca SH |
159 | /** |
160 | * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast | |
161 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
162 | * | |
163 | * Return true if the address is the broadcast address. | |
2c722fe1 JP |
164 | * |
165 | * Please note: addr must be aligned to u16. | |
c2da8aca | 166 | */ |
b44907e6 | 167 | static inline bool is_broadcast_ether_addr(const u8 *addr) |
9bd481f8 | 168 | { |
2c722fe1 JP |
169 | return (*(const u16 *)(addr + 0) & |
170 | *(const u16 *)(addr + 2) & | |
171 | *(const u16 *)(addr + 4)) == 0xffff; | |
9bd481f8 JG |
172 | } |
173 | ||
51e7eed7 TK |
174 | /** |
175 | * is_unicast_ether_addr - Determine if the Ethernet address is unicast | |
176 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
177 | * | |
178 | * Return true if the address is a unicast address. | |
179 | */ | |
b44907e6 | 180 | static inline bool is_unicast_ether_addr(const u8 *addr) |
51e7eed7 TK |
181 | { |
182 | return !is_multicast_ether_addr(addr); | |
183 | } | |
184 | ||
1da177e4 LT |
185 | /** |
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 | |
188 | * | |
189 | * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not | |
79165121 | 190 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
1da177e4 LT |
191 | * |
192 | * Return true if the address is valid. | |
2c722fe1 JP |
193 | * |
194 | * Please note: addr must be aligned to u16. | |
1da177e4 | 195 | */ |
b44907e6 | 196 | static inline bool is_valid_ether_addr(const u8 *addr) |
1da177e4 | 197 | { |
79165121 ME |
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); | |
1da177e4 LT |
201 | } |
202 | ||
2c7a88c2 AD |
203 | /** |
204 | * eth_proto_is_802_3 - Determine if a given Ethertype/length is a protocol | |
205 | * @proto: Ethertype/length value to be tested | |
206 | * | |
207 | * Check that the value from the Ethertype/length field is a valid Ethertype. | |
208 | * | |
209 | * Return true if the valid is an 802.3 supported Ethertype. | |
210 | */ | |
211 | static inline bool eth_proto_is_802_3(__be16 proto) | |
212 | { | |
213 | #ifndef __BIG_ENDIAN | |
214 | /* if CPU is little endian mask off bits representing LSB */ | |
215 | proto &= htons(0xFF00); | |
216 | #endif | |
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); | |
219 | } | |
220 | ||
1da177e4 | 221 | /** |
0a4dd594 | 222 | * eth_random_addr - Generate software assigned random Ethernet address |
1da177e4 LT |
223 | * @addr: Pointer to a six-byte array containing the Ethernet address |
224 | * | |
225 | * Generate a random Ethernet address (MAC) that is not multicast | |
226 | * and has the local assigned bit set. | |
227 | */ | |
0a4dd594 | 228 | static inline void eth_random_addr(u8 *addr) |
1da177e4 | 229 | { |
0a4dd594 JP |
230 | get_random_bytes(addr, ETH_ALEN); |
231 | addr[0] &= 0xfe; /* clear multicast bit */ | |
232 | addr[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
1da177e4 | 233 | } |
360ac8e2 | 234 | |
0a4dd594 JP |
235 | #define random_ether_addr(addr) eth_random_addr(addr) |
236 | ||
ad7eee98 JB |
237 | /** |
238 | * eth_broadcast_addr - Assign broadcast address | |
239 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
240 | * | |
241 | * Assign the broadcast address to the given address array. | |
242 | */ | |
243 | static inline void eth_broadcast_addr(u8 *addr) | |
244 | { | |
245 | memset(addr, 0xff, ETH_ALEN); | |
246 | } | |
247 | ||
6d57e907 DJ |
248 | /** |
249 | * eth_zero_addr - Assign zero address | |
250 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
251 | * | |
252 | * Assign the zero address to the given address array. | |
253 | */ | |
254 | static inline void eth_zero_addr(u8 *addr) | |
255 | { | |
256 | memset(addr, 0x00, ETH_ALEN); | |
257 | } | |
258 | ||
c1f79426 | 259 | /** |
1a0d6ae5 DK |
260 | * eth_hw_addr_random - Generate software assigned random Ethernet and |
261 | * set device flag | |
c1f79426 | 262 | * @dev: pointer to net_device structure |
c1f79426 | 263 | * |
1a0d6ae5 DK |
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 | |
266 | * used by userspace. | |
c1f79426 | 267 | */ |
1a0d6ae5 | 268 | static inline void eth_hw_addr_random(struct net_device *dev) |
c1f79426 | 269 | { |
e41b2d7f | 270 | dev->addr_assign_type = NET_ADDR_RANDOM; |
0a4dd594 | 271 | eth_random_addr(dev->dev_addr); |
c1f79426 SA |
272 | } |
273 | ||
286ab723 JP |
274 | /** |
275 | * ether_addr_copy - Copy an Ethernet address | |
276 | * @dst: Pointer to a six-byte array Ethernet address destination | |
277 | * @src: Pointer to a six-byte array Ethernet address source | |
278 | * | |
279 | * Please note: dst & src must both be aligned to u16. | |
280 | */ | |
281 | static inline void ether_addr_copy(u8 *dst, const u8 *src) | |
282 | { | |
283 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
284 | *(u32 *)dst = *(const u32 *)src; | |
285 | *(u16 *)(dst + 4) = *(const u16 *)(src + 4); | |
286 | #else | |
287 | u16 *a = (u16 *)dst; | |
288 | const u16 *b = (const u16 *)src; | |
289 | ||
290 | a[0] = b[0]; | |
291 | a[1] = b[1]; | |
292 | a[2] = b[2]; | |
293 | #endif | |
294 | } | |
295 | ||
83a093b4 BM |
296 | /** |
297 | * eth_hw_addr_inherit - Copy dev_addr from another net_device | |
298 | * @dst: pointer to net_device to copy dev_addr to | |
299 | * @src: pointer to net_device to copy dev_addr from | |
300 | * | |
301 | * Copy the Ethernet address from one net_device to another along with | |
302 | * the address attributes (addr_assign_type). | |
303 | */ | |
304 | static inline void eth_hw_addr_inherit(struct net_device *dst, | |
305 | struct net_device *src) | |
306 | { | |
307 | dst->addr_assign_type = src->addr_assign_type; | |
286ab723 | 308 | ether_addr_copy(dst->dev_addr, src->dev_addr); |
83a093b4 BM |
309 | } |
310 | ||
a599b0f5 JP |
311 | /** |
312 | * ether_addr_equal - Compare two Ethernet addresses | |
313 | * @addr1: Pointer to a six-byte array containing the Ethernet address | |
314 | * @addr2: Pointer other six-byte array containing the Ethernet address | |
315 | * | |
048b899c | 316 | * Compare two Ethernet addresses, returns true if equal |
0d74c42f JP |
317 | * |
318 | * Please note: addr1 & addr2 must both be aligned to u16. | |
a599b0f5 JP |
319 | */ |
320 | static inline bool ether_addr_equal(const u8 *addr1, const u8 *addr2) | |
321 | { | |
0d74c42f JP |
322 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
323 | u32 fold = ((*(const u32 *)addr1) ^ (*(const u32 *)addr2)) | | |
324 | ((*(const u16 *)(addr1 + 4)) ^ (*(const u16 *)(addr2 + 4))); | |
a599b0f5 | 325 | |
0d74c42f | 326 | return fold == 0; |
1f87e235 | 327 | #else |
0d74c42f JP |
328 | const u16 *a = (const u16 *)addr1; |
329 | const u16 *b = (const u16 *)addr2; | |
330 | ||
331 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) == 0; | |
1f87e235 ED |
332 | #endif |
333 | } | |
334 | ||
335 | /** | |
e550ba1a | 336 | * ether_addr_equal_64bits - Compare two Ethernet addresses |
1f87e235 ED |
337 | * @addr1: Pointer to an array of 8 bytes |
338 | * @addr2: Pointer to an other array of 8 bytes | |
339 | * | |
048b899c | 340 | * Compare two Ethernet addresses, returns true if equal, false otherwise. |
e550ba1a | 341 | * |
1c430a72 JB |
342 | * The function doesn't need any conditional branches and possibly uses |
343 | * word memory accesses on CPU allowing cheap unaligned memory reads. | |
048b899c | 344 | * arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 } |
1f87e235 | 345 | * |
048b899c | 346 | * Please note that alignment of addr1 & addr2 are only guaranteed to be 16 bits. |
1f87e235 ED |
347 | */ |
348 | ||
e550ba1a JP |
349 | static inline bool ether_addr_equal_64bits(const u8 addr1[6+2], |
350 | const u8 addr2[6+2]) | |
1f87e235 | 351 | { |
0d74c42f JP |
352 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
353 | u64 fold = (*(const u64 *)addr1) ^ (*(const u64 *)addr2); | |
1f87e235 | 354 | |
0d74c42f JP |
355 | #ifdef __BIG_ENDIAN |
356 | return (fold >> 16) == 0; | |
357 | #else | |
358 | return (fold << 16) == 0; | |
359 | #endif | |
1f87e235 | 360 | #else |
e550ba1a | 361 | return ether_addr_equal(addr1, addr2); |
1f87e235 ED |
362 | #endif |
363 | } | |
f001fde5 | 364 | |
73eaef87 JP |
365 | /** |
366 | * ether_addr_equal_unaligned - Compare two not u16 aligned Ethernet addresses | |
367 | * @addr1: Pointer to a six-byte array containing the Ethernet address | |
368 | * @addr2: Pointer other six-byte array containing the Ethernet address | |
369 | * | |
370 | * Compare two Ethernet addresses, returns true if equal | |
371 | * | |
372 | * Please note: Use only when any Ethernet address may not be u16 aligned. | |
373 | */ | |
374 | static inline bool ether_addr_equal_unaligned(const u8 *addr1, const u8 *addr2) | |
375 | { | |
376 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
377 | return ether_addr_equal(addr1, addr2); | |
378 | #else | |
379 | return memcmp(addr1, addr2, ETH_ALEN) == 0; | |
380 | #endif | |
381 | } | |
382 | ||
4ae89ad9 JP |
383 | /** |
384 | * ether_addr_equal_masked - Compare two Ethernet addresses with a mask | |
385 | * @addr1: Pointer to a six-byte array containing the 1st Ethernet address | |
386 | * @addr2: Pointer to a six-byte array containing the 2nd Ethernet address | |
387 | * @mask: Pointer to a six-byte array containing the Ethernet address bitmask | |
388 | * | |
389 | * Compare two Ethernet addresses with a mask, returns true if for every bit | |
390 | * set in the bitmask the equivalent bits in the ethernet addresses are equal. | |
391 | * Using a mask with all bits set is a slower ether_addr_equal. | |
392 | */ | |
393 | static inline bool ether_addr_equal_masked(const u8 *addr1, const u8 *addr2, | |
394 | const u8 *mask) | |
395 | { | |
396 | int i; | |
397 | ||
398 | for (i = 0; i < ETH_ALEN; i++) { | |
399 | if ((addr1[i] ^ addr2[i]) & mask[i]) | |
400 | return false; | |
401 | } | |
402 | ||
403 | return true; | |
404 | } | |
405 | ||
59527581 AL |
406 | /** |
407 | * ether_addr_to_u64 - Convert an Ethernet address into a u64 value. | |
408 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
409 | * | |
410 | * Return a u64 value of the address | |
411 | */ | |
412 | static inline u64 ether_addr_to_u64(const u8 *addr) | |
413 | { | |
414 | u64 u = 0; | |
415 | int i; | |
416 | ||
417 | for (i = 0; i < ETH_ALEN; i++) | |
418 | u = u << 8 | addr[i]; | |
419 | ||
420 | return u; | |
421 | } | |
422 | ||
423 | /** | |
424 | * u64_to_ether_addr - Convert a u64 to an Ethernet address. | |
425 | * @u: u64 to convert to an Ethernet MAC address | |
426 | * @addr: Pointer to a six-byte array to contain the Ethernet address | |
427 | */ | |
428 | static inline void u64_to_ether_addr(u64 u, u8 *addr) | |
429 | { | |
430 | int i; | |
431 | ||
432 | for (i = ETH_ALEN - 1; i >= 0; i--) { | |
433 | addr[i] = u & 0xff; | |
434 | u = u >> 8; | |
435 | } | |
436 | } | |
437 | ||
438 | /** | |
439 | * eth_addr_dec - Decrement the given MAC address | |
440 | * | |
441 | * @addr: Pointer to a six-byte array containing Ethernet address to decrement | |
442 | */ | |
443 | static inline void eth_addr_dec(u8 *addr) | |
444 | { | |
445 | u64 u = ether_addr_to_u64(addr); | |
446 | ||
447 | u--; | |
448 | u64_to_ether_addr(u, addr); | |
449 | } | |
450 | ||
1c5c12ee TR |
451 | /** |
452 | * eth_addr_inc() - Increment the given MAC address. | |
453 | * @addr: Pointer to a six-byte array containing Ethernet address to increment. | |
454 | */ | |
455 | static inline void eth_addr_inc(u8 *addr) | |
456 | { | |
457 | u64 u = ether_addr_to_u64(addr); | |
458 | ||
459 | u++; | |
460 | u64_to_ether_addr(u, addr); | |
461 | } | |
462 | ||
f001fde5 JP |
463 | /** |
464 | * is_etherdev_addr - Tell if given Ethernet address belongs to the device. | |
465 | * @dev: Pointer to a device structure | |
466 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
467 | * | |
468 | * Compare passed address with all addresses of the device. Return true if the | |
469 | * address if one of the device addresses. | |
470 | * | |
e550ba1a | 471 | * Note that this function calls ether_addr_equal_64bits() so take care of |
f001fde5 JP |
472 | * the right padding. |
473 | */ | |
474 | static inline bool is_etherdev_addr(const struct net_device *dev, | |
475 | const u8 addr[6 + 2]) | |
476 | { | |
477 | struct netdev_hw_addr *ha; | |
e550ba1a | 478 | bool res = false; |
f001fde5 JP |
479 | |
480 | rcu_read_lock(); | |
481 | for_each_dev_addr(dev, ha) { | |
e550ba1a JP |
482 | res = ether_addr_equal_64bits(addr, ha->addr); |
483 | if (res) | |
f001fde5 JP |
484 | break; |
485 | } | |
486 | rcu_read_unlock(); | |
e550ba1a | 487 | return res; |
f001fde5 | 488 | } |
79165121 | 489 | #endif /* __KERNEL__ */ |
1da177e4 | 490 | |
aa4b9f53 HX |
491 | /** |
492 | * compare_ether_header - Compare two Ethernet headers | |
493 | * @a: Pointer to Ethernet header | |
494 | * @b: Pointer to Ethernet header | |
495 | * | |
048b899c | 496 | * Compare two Ethernet headers, returns 0 if equal. |
aa4b9f53 HX |
497 | * This assumes that the network header (i.e., IP header) is 4-byte |
498 | * aligned OR the platform can handle unaligned access. This is the | |
499 | * case for all packets coming into netif_receive_skb or similar | |
500 | * entry points. | |
501 | */ | |
502 | ||
40d0802b | 503 | static inline unsigned long compare_ether_header(const void *a, const void *b) |
aa4b9f53 | 504 | { |
40d0802b ED |
505 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
506 | unsigned long fold; | |
507 | ||
508 | /* | |
509 | * We want to compare 14 bytes: | |
510 | * [a0 ... a13] ^ [b0 ... b13] | |
511 | * Use two long XOR, ORed together, with an overlap of two bytes. | |
512 | * [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] | | |
513 | * [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13] | |
514 | * This means the [a6 a7] ^ [b6 b7] part is done two times. | |
515 | */ | |
516 | fold = *(unsigned long *)a ^ *(unsigned long *)b; | |
517 | fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6); | |
518 | return fold; | |
519 | #else | |
aa4b9f53 HX |
520 | u32 *a32 = (u32 *)((u8 *)a + 2); |
521 | u32 *b32 = (u32 *)((u8 *)b + 2); | |
522 | ||
523 | return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) | | |
524 | (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]); | |
40d0802b | 525 | #endif |
aa4b9f53 HX |
526 | } |
527 | ||
9c0c1124 AD |
528 | /** |
529 | * eth_skb_pad - Pad buffer to mininum number of octets for Ethernet frame | |
530 | * @skb: Buffer to pad | |
531 | * | |
532 | * An Ethernet frame should have a minimum size of 60 bytes. This function | |
533 | * takes short frames and pads them with zeros up to the 60 byte limit. | |
534 | */ | |
535 | static inline int eth_skb_pad(struct sk_buff *skb) | |
536 | { | |
537 | return skb_put_padto(skb, ETH_ZLEN); | |
538 | } | |
539 | ||
1da177e4 | 540 | #endif /* _LINUX_ETHERDEVICE_H */ |