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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__ | |
f629d208 | 32 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev); |
3b04ddde SH |
33 | extern const struct header_ops eth_header_ops; |
34 | ||
f629d208 JP |
35 | int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, |
36 | const void *daddr, const void *saddr, unsigned len); | |
37 | int eth_rebuild_header(struct sk_buff *skb); | |
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, | |
40 | __be16 type); | |
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); | |
ccad637b | 48 | |
f629d208 | 49 | struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, |
36909ea4 | 50 | unsigned int rxqs); |
f25f4e44 | 51 | #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1) |
36909ea4 | 52 | #define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count) |
1da177e4 | 53 | |
b3343a2a | 54 | /* Reserved Ethernet Addresses per IEEE 802.1Q */ |
2bc80059 BH |
55 | static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) = |
56 | { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; | |
b3343a2a JF |
57 | |
58 | /** | |
46acc460 | 59 | * is_link_local_ether_addr - Determine if given Ethernet address is link-local |
b3343a2a JF |
60 | * @addr: Pointer to a six-byte array containing the Ethernet address |
61 | * | |
62 | * Return true if address is link local reserved addr (01:80:c2:00:00:0X) per | |
63 | * IEEE 802.1Q 8.6.3 Frame filtering. | |
64 | */ | |
46acc460 | 65 | static inline bool is_link_local_ether_addr(const u8 *addr) |
b3343a2a | 66 | { |
46acc460 | 67 | __be16 *a = (__be16 *)addr; |
2bc80059 | 68 | static const __be16 *b = (const __be16 *)eth_reserved_addr_base; |
b3343a2a JF |
69 | static const __be16 m = cpu_to_be16(0xfff0); |
70 | ||
71 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0; | |
72 | } | |
73 | ||
1da177e4 | 74 | /** |
c2da8aca SH |
75 | * is_zero_ether_addr - Determine if give Ethernet address is all zeros. |
76 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
77 | * | |
78 | * Return true if the address is all zeroes. | |
1da177e4 | 79 | */ |
b44907e6 | 80 | static inline bool is_zero_ether_addr(const u8 *addr) |
1da177e4 LT |
81 | { |
82 | return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]); | |
83 | } | |
84 | ||
79165121 | 85 | /** |
c2da8aca | 86 | * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. |
79165121 ME |
87 | * @addr: Pointer to a six-byte array containing the Ethernet address |
88 | * | |
89 | * Return true if the address is a multicast address. | |
88df8ef5 | 90 | * By definition the broadcast address is also a multicast address. |
79165121 | 91 | */ |
b44907e6 | 92 | static inline bool is_multicast_ether_addr(const u8 *addr) |
79165121 | 93 | { |
a02cec21 | 94 | return 0x01 & addr[0]; |
79165121 ME |
95 | } |
96 | ||
e024715f | 97 | /** |
bc2cda1e | 98 | * is_local_ether_addr - Determine if the Ethernet address is locally-assigned one (IEEE 802). |
e024715f PBG |
99 | * @addr: Pointer to a six-byte array containing the Ethernet address |
100 | * | |
101 | * Return true if the address is a local address. | |
102 | */ | |
b44907e6 | 103 | static inline bool is_local_ether_addr(const u8 *addr) |
e024715f | 104 | { |
a02cec21 | 105 | return 0x02 & addr[0]; |
e024715f PBG |
106 | } |
107 | ||
c2da8aca SH |
108 | /** |
109 | * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast | |
110 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
111 | * | |
112 | * Return true if the address is the broadcast address. | |
113 | */ | |
b44907e6 | 114 | static inline bool is_broadcast_ether_addr(const u8 *addr) |
9bd481f8 | 115 | { |
2407534f | 116 | return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff; |
9bd481f8 JG |
117 | } |
118 | ||
51e7eed7 TK |
119 | /** |
120 | * is_unicast_ether_addr - Determine if the Ethernet address is unicast | |
121 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
122 | * | |
123 | * Return true if the address is a unicast address. | |
124 | */ | |
b44907e6 | 125 | static inline bool is_unicast_ether_addr(const u8 *addr) |
51e7eed7 TK |
126 | { |
127 | return !is_multicast_ether_addr(addr); | |
128 | } | |
129 | ||
1da177e4 LT |
130 | /** |
131 | * is_valid_ether_addr - Determine if the given Ethernet address is valid | |
132 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
133 | * | |
134 | * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not | |
79165121 | 135 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
1da177e4 LT |
136 | * |
137 | * Return true if the address is valid. | |
138 | */ | |
b44907e6 | 139 | static inline bool is_valid_ether_addr(const u8 *addr) |
1da177e4 | 140 | { |
79165121 ME |
141 | /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to |
142 | * explicitly check for it here. */ | |
143 | return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); | |
1da177e4 LT |
144 | } |
145 | ||
146 | /** | |
0a4dd594 | 147 | * eth_random_addr - Generate software assigned random Ethernet address |
1da177e4 LT |
148 | * @addr: Pointer to a six-byte array containing the Ethernet address |
149 | * | |
150 | * Generate a random Ethernet address (MAC) that is not multicast | |
151 | * and has the local assigned bit set. | |
152 | */ | |
0a4dd594 | 153 | static inline void eth_random_addr(u8 *addr) |
1da177e4 | 154 | { |
0a4dd594 JP |
155 | get_random_bytes(addr, ETH_ALEN); |
156 | addr[0] &= 0xfe; /* clear multicast bit */ | |
157 | addr[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
1da177e4 | 158 | } |
360ac8e2 | 159 | |
0a4dd594 JP |
160 | #define random_ether_addr(addr) eth_random_addr(addr) |
161 | ||
ad7eee98 JB |
162 | /** |
163 | * eth_broadcast_addr - Assign broadcast address | |
164 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
165 | * | |
166 | * Assign the broadcast address to the given address array. | |
167 | */ | |
168 | static inline void eth_broadcast_addr(u8 *addr) | |
169 | { | |
170 | memset(addr, 0xff, ETH_ALEN); | |
171 | } | |
172 | ||
6d57e907 DJ |
173 | /** |
174 | * eth_zero_addr - Assign zero address | |
175 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
176 | * | |
177 | * Assign the zero address to the given address array. | |
178 | */ | |
179 | static inline void eth_zero_addr(u8 *addr) | |
180 | { | |
181 | memset(addr, 0x00, ETH_ALEN); | |
182 | } | |
183 | ||
c1f79426 | 184 | /** |
1a0d6ae5 DK |
185 | * eth_hw_addr_random - Generate software assigned random Ethernet and |
186 | * set device flag | |
c1f79426 | 187 | * @dev: pointer to net_device structure |
c1f79426 | 188 | * |
1a0d6ae5 DK |
189 | * Generate a random Ethernet address (MAC) to be used by a net device |
190 | * and set addr_assign_type so the state can be read by sysfs and be | |
191 | * used by userspace. | |
c1f79426 | 192 | */ |
1a0d6ae5 | 193 | static inline void eth_hw_addr_random(struct net_device *dev) |
c1f79426 | 194 | { |
e41b2d7f | 195 | dev->addr_assign_type = NET_ADDR_RANDOM; |
0a4dd594 | 196 | eth_random_addr(dev->dev_addr); |
c1f79426 SA |
197 | } |
198 | ||
83a093b4 BM |
199 | /** |
200 | * eth_hw_addr_inherit - Copy dev_addr from another net_device | |
201 | * @dst: pointer to net_device to copy dev_addr to | |
202 | * @src: pointer to net_device to copy dev_addr from | |
203 | * | |
204 | * Copy the Ethernet address from one net_device to another along with | |
205 | * the address attributes (addr_assign_type). | |
206 | */ | |
207 | static inline void eth_hw_addr_inherit(struct net_device *dst, | |
208 | struct net_device *src) | |
209 | { | |
210 | dst->addr_assign_type = src->addr_assign_type; | |
211 | memcpy(dst->dev_addr, src->dev_addr, ETH_ALEN); | |
212 | } | |
213 | ||
a599b0f5 JP |
214 | /** |
215 | * ether_addr_equal - Compare two Ethernet addresses | |
216 | * @addr1: Pointer to a six-byte array containing the Ethernet address | |
217 | * @addr2: Pointer other six-byte array containing the Ethernet address | |
218 | * | |
048b899c | 219 | * Compare two Ethernet addresses, returns true if equal |
0d74c42f JP |
220 | * |
221 | * Please note: addr1 & addr2 must both be aligned to u16. | |
a599b0f5 JP |
222 | */ |
223 | static inline bool ether_addr_equal(const u8 *addr1, const u8 *addr2) | |
224 | { | |
0d74c42f JP |
225 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
226 | u32 fold = ((*(const u32 *)addr1) ^ (*(const u32 *)addr2)) | | |
227 | ((*(const u16 *)(addr1 + 4)) ^ (*(const u16 *)(addr2 + 4))); | |
a599b0f5 | 228 | |
0d74c42f | 229 | return fold == 0; |
1f87e235 | 230 | #else |
0d74c42f JP |
231 | const u16 *a = (const u16 *)addr1; |
232 | const u16 *b = (const u16 *)addr2; | |
233 | ||
234 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) == 0; | |
1f87e235 ED |
235 | #endif |
236 | } | |
237 | ||
238 | /** | |
e550ba1a | 239 | * ether_addr_equal_64bits - Compare two Ethernet addresses |
1f87e235 ED |
240 | * @addr1: Pointer to an array of 8 bytes |
241 | * @addr2: Pointer to an other array of 8 bytes | |
242 | * | |
048b899c | 243 | * Compare two Ethernet addresses, returns true if equal, false otherwise. |
e550ba1a | 244 | * |
1c430a72 JB |
245 | * The function doesn't need any conditional branches and possibly uses |
246 | * word memory accesses on CPU allowing cheap unaligned memory reads. | |
048b899c | 247 | * arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 } |
1f87e235 | 248 | * |
048b899c | 249 | * Please note that alignment of addr1 & addr2 are only guaranteed to be 16 bits. |
1f87e235 ED |
250 | */ |
251 | ||
e550ba1a JP |
252 | static inline bool ether_addr_equal_64bits(const u8 addr1[6+2], |
253 | const u8 addr2[6+2]) | |
1f87e235 | 254 | { |
0d74c42f JP |
255 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
256 | u64 fold = (*(const u64 *)addr1) ^ (*(const u64 *)addr2); | |
1f87e235 | 257 | |
0d74c42f JP |
258 | #ifdef __BIG_ENDIAN |
259 | return (fold >> 16) == 0; | |
260 | #else | |
261 | return (fold << 16) == 0; | |
262 | #endif | |
1f87e235 | 263 | #else |
e550ba1a | 264 | return ether_addr_equal(addr1, addr2); |
1f87e235 ED |
265 | #endif |
266 | } | |
f001fde5 | 267 | |
73eaef87 JP |
268 | /** |
269 | * ether_addr_equal_unaligned - Compare two not u16 aligned Ethernet addresses | |
270 | * @addr1: Pointer to a six-byte array containing the Ethernet address | |
271 | * @addr2: Pointer other six-byte array containing the Ethernet address | |
272 | * | |
273 | * Compare two Ethernet addresses, returns true if equal | |
274 | * | |
275 | * Please note: Use only when any Ethernet address may not be u16 aligned. | |
276 | */ | |
277 | static inline bool ether_addr_equal_unaligned(const u8 *addr1, const u8 *addr2) | |
278 | { | |
279 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
280 | return ether_addr_equal(addr1, addr2); | |
281 | #else | |
282 | return memcmp(addr1, addr2, ETH_ALEN) == 0; | |
283 | #endif | |
284 | } | |
285 | ||
f001fde5 JP |
286 | /** |
287 | * is_etherdev_addr - Tell if given Ethernet address belongs to the device. | |
288 | * @dev: Pointer to a device structure | |
289 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
290 | * | |
291 | * Compare passed address with all addresses of the device. Return true if the | |
292 | * address if one of the device addresses. | |
293 | * | |
e550ba1a | 294 | * Note that this function calls ether_addr_equal_64bits() so take care of |
f001fde5 JP |
295 | * the right padding. |
296 | */ | |
297 | static inline bool is_etherdev_addr(const struct net_device *dev, | |
298 | const u8 addr[6 + 2]) | |
299 | { | |
300 | struct netdev_hw_addr *ha; | |
e550ba1a | 301 | bool res = false; |
f001fde5 JP |
302 | |
303 | rcu_read_lock(); | |
304 | for_each_dev_addr(dev, ha) { | |
e550ba1a JP |
305 | res = ether_addr_equal_64bits(addr, ha->addr); |
306 | if (res) | |
f001fde5 JP |
307 | break; |
308 | } | |
309 | rcu_read_unlock(); | |
e550ba1a | 310 | return res; |
f001fde5 | 311 | } |
79165121 | 312 | #endif /* __KERNEL__ */ |
1da177e4 | 313 | |
aa4b9f53 HX |
314 | /** |
315 | * compare_ether_header - Compare two Ethernet headers | |
316 | * @a: Pointer to Ethernet header | |
317 | * @b: Pointer to Ethernet header | |
318 | * | |
048b899c | 319 | * Compare two Ethernet headers, returns 0 if equal. |
aa4b9f53 HX |
320 | * This assumes that the network header (i.e., IP header) is 4-byte |
321 | * aligned OR the platform can handle unaligned access. This is the | |
322 | * case for all packets coming into netif_receive_skb or similar | |
323 | * entry points. | |
324 | */ | |
325 | ||
40d0802b | 326 | static inline unsigned long compare_ether_header(const void *a, const void *b) |
aa4b9f53 | 327 | { |
40d0802b ED |
328 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
329 | unsigned long fold; | |
330 | ||
331 | /* | |
332 | * We want to compare 14 bytes: | |
333 | * [a0 ... a13] ^ [b0 ... b13] | |
334 | * Use two long XOR, ORed together, with an overlap of two bytes. | |
335 | * [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] | | |
336 | * [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13] | |
337 | * This means the [a6 a7] ^ [b6 b7] part is done two times. | |
338 | */ | |
339 | fold = *(unsigned long *)a ^ *(unsigned long *)b; | |
340 | fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6); | |
341 | return fold; | |
342 | #else | |
aa4b9f53 HX |
343 | u32 *a32 = (u32 *)((u8 *)a + 2); |
344 | u32 *b32 = (u32 *)((u8 *)b + 2); | |
345 | ||
346 | return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) | | |
347 | (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]); | |
40d0802b | 348 | #endif |
aa4b9f53 HX |
349 | } |
350 | ||
1da177e4 | 351 | #endif /* _LINUX_ETHERDEVICE_H */ |