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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> |
1da177e4 LT |
29 | |
30 | #ifdef __KERNEL__ | |
ab611487 | 31 | extern __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev); |
3b04ddde SH |
32 | extern const struct header_ops eth_header_ops; |
33 | ||
34 | extern int eth_header(struct sk_buff *skb, struct net_device *dev, | |
35 | unsigned short type, | |
36 | const void *daddr, const void *saddr, unsigned len); | |
37 | extern int eth_rebuild_header(struct sk_buff *skb); | |
38 | extern int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr); | |
e69dd336 | 39 | extern int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type); |
3b04ddde SH |
40 | extern void eth_header_cache_update(struct hh_cache *hh, |
41 | const struct net_device *dev, | |
42 | const unsigned char *haddr); | |
ccad637b SH |
43 | extern int eth_mac_addr(struct net_device *dev, void *p); |
44 | extern int eth_change_mtu(struct net_device *dev, int new_mtu); | |
45 | extern int eth_validate_addr(struct net_device *dev); | |
46 | ||
3b04ddde | 47 | |
1da177e4 | 48 | |
36909ea4 TH |
49 | extern struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, |
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 LT |
53 | |
54 | /** | |
c2da8aca SH |
55 | * is_zero_ether_addr - Determine if give Ethernet address is all zeros. |
56 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
57 | * | |
58 | * Return true if the address is all zeroes. | |
1da177e4 | 59 | */ |
b44907e6 | 60 | static inline bool is_zero_ether_addr(const u8 *addr) |
1da177e4 LT |
61 | { |
62 | return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]); | |
63 | } | |
64 | ||
79165121 | 65 | /** |
c2da8aca | 66 | * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. |
79165121 ME |
67 | * @addr: Pointer to a six-byte array containing the Ethernet address |
68 | * | |
69 | * Return true if the address is a multicast address. | |
88df8ef5 | 70 | * By definition the broadcast address is also a multicast address. |
79165121 | 71 | */ |
b44907e6 | 72 | static inline bool is_multicast_ether_addr(const u8 *addr) |
79165121 | 73 | { |
a02cec21 | 74 | return 0x01 & addr[0]; |
79165121 ME |
75 | } |
76 | ||
e024715f | 77 | /** |
bc2cda1e | 78 | * is_local_ether_addr - Determine if the Ethernet address is locally-assigned one (IEEE 802). |
e024715f PBG |
79 | * @addr: Pointer to a six-byte array containing the Ethernet address |
80 | * | |
81 | * Return true if the address is a local address. | |
82 | */ | |
b44907e6 | 83 | static inline bool is_local_ether_addr(const u8 *addr) |
e024715f | 84 | { |
a02cec21 | 85 | return 0x02 & addr[0]; |
e024715f PBG |
86 | } |
87 | ||
c2da8aca SH |
88 | /** |
89 | * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast | |
90 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
91 | * | |
92 | * Return true if the address is the broadcast address. | |
93 | */ | |
b44907e6 | 94 | static inline bool is_broadcast_ether_addr(const u8 *addr) |
9bd481f8 | 95 | { |
2407534f | 96 | return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff; |
9bd481f8 JG |
97 | } |
98 | ||
51e7eed7 TK |
99 | /** |
100 | * is_unicast_ether_addr - Determine if the Ethernet address is unicast | |
101 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
102 | * | |
103 | * Return true if the address is a unicast address. | |
104 | */ | |
b44907e6 | 105 | static inline bool is_unicast_ether_addr(const u8 *addr) |
51e7eed7 TK |
106 | { |
107 | return !is_multicast_ether_addr(addr); | |
108 | } | |
109 | ||
1da177e4 LT |
110 | /** |
111 | * is_valid_ether_addr - Determine if the given Ethernet address is valid | |
112 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
113 | * | |
114 | * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not | |
79165121 | 115 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
1da177e4 LT |
116 | * |
117 | * Return true if the address is valid. | |
118 | */ | |
b44907e6 | 119 | static inline bool is_valid_ether_addr(const u8 *addr) |
1da177e4 | 120 | { |
79165121 ME |
121 | /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to |
122 | * explicitly check for it here. */ | |
123 | return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); | |
1da177e4 LT |
124 | } |
125 | ||
126 | /** | |
0a4dd594 | 127 | * eth_random_addr - Generate software assigned random Ethernet address |
1da177e4 LT |
128 | * @addr: Pointer to a six-byte array containing the Ethernet address |
129 | * | |
130 | * Generate a random Ethernet address (MAC) that is not multicast | |
131 | * and has the local assigned bit set. | |
132 | */ | |
0a4dd594 | 133 | static inline void eth_random_addr(u8 *addr) |
1da177e4 | 134 | { |
0a4dd594 JP |
135 | get_random_bytes(addr, ETH_ALEN); |
136 | addr[0] &= 0xfe; /* clear multicast bit */ | |
137 | addr[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
1da177e4 | 138 | } |
360ac8e2 | 139 | |
0a4dd594 JP |
140 | #define random_ether_addr(addr) eth_random_addr(addr) |
141 | ||
ad7eee98 JB |
142 | /** |
143 | * eth_broadcast_addr - Assign broadcast address | |
144 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
145 | * | |
146 | * Assign the broadcast address to the given address array. | |
147 | */ | |
148 | static inline void eth_broadcast_addr(u8 *addr) | |
149 | { | |
150 | memset(addr, 0xff, ETH_ALEN); | |
151 | } | |
152 | ||
6d57e907 DJ |
153 | /** |
154 | * eth_zero_addr - Assign zero address | |
155 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
156 | * | |
157 | * Assign the zero address to the given address array. | |
158 | */ | |
159 | static inline void eth_zero_addr(u8 *addr) | |
160 | { | |
161 | memset(addr, 0x00, ETH_ALEN); | |
162 | } | |
163 | ||
c1f79426 | 164 | /** |
1a0d6ae5 DK |
165 | * eth_hw_addr_random - Generate software assigned random Ethernet and |
166 | * set device flag | |
c1f79426 | 167 | * @dev: pointer to net_device structure |
c1f79426 | 168 | * |
1a0d6ae5 DK |
169 | * Generate a random Ethernet address (MAC) to be used by a net device |
170 | * and set addr_assign_type so the state can be read by sysfs and be | |
171 | * used by userspace. | |
c1f79426 | 172 | */ |
1a0d6ae5 | 173 | static inline void eth_hw_addr_random(struct net_device *dev) |
c1f79426 SA |
174 | { |
175 | dev->addr_assign_type |= NET_ADDR_RANDOM; | |
0a4dd594 | 176 | eth_random_addr(dev->dev_addr); |
c1f79426 SA |
177 | } |
178 | ||
360ac8e2 SH |
179 | /** |
180 | * compare_ether_addr - Compare two Ethernet addresses | |
181 | * @addr1: Pointer to a six-byte array containing the Ethernet address | |
c2da8aca | 182 | * @addr2: Pointer other six-byte array containing the Ethernet address |
360ac8e2 | 183 | * |
048b899c | 184 | * Compare two Ethernet addresses, returns 0 if equal, non-zero otherwise. |
1c430a72 | 185 | * Unlike memcmp(), it doesn't return a value suitable for sorting. |
360ac8e2 | 186 | */ |
c2da8aca | 187 | static inline unsigned compare_ether_addr(const u8 *addr1, const u8 *addr2) |
360ac8e2 | 188 | { |
c2da8aca SH |
189 | const u16 *a = (const u16 *) addr1; |
190 | const u16 *b = (const u16 *) addr2; | |
360ac8e2 SH |
191 | |
192 | BUILD_BUG_ON(ETH_ALEN != 6); | |
193 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0; | |
194 | } | |
1f87e235 | 195 | |
a599b0f5 JP |
196 | /** |
197 | * ether_addr_equal - Compare two Ethernet addresses | |
198 | * @addr1: Pointer to a six-byte array containing the Ethernet address | |
199 | * @addr2: Pointer other six-byte array containing the Ethernet address | |
200 | * | |
048b899c | 201 | * Compare two Ethernet addresses, returns true if equal |
a599b0f5 JP |
202 | */ |
203 | static inline bool ether_addr_equal(const u8 *addr1, const u8 *addr2) | |
204 | { | |
205 | return !compare_ether_addr(addr1, addr2); | |
206 | } | |
207 | ||
1f87e235 ED |
208 | static inline unsigned long zap_last_2bytes(unsigned long value) |
209 | { | |
210 | #ifdef __BIG_ENDIAN | |
211 | return value >> 16; | |
212 | #else | |
213 | return value << 16; | |
214 | #endif | |
215 | } | |
216 | ||
217 | /** | |
e550ba1a | 218 | * ether_addr_equal_64bits - Compare two Ethernet addresses |
1f87e235 ED |
219 | * @addr1: Pointer to an array of 8 bytes |
220 | * @addr2: Pointer to an other array of 8 bytes | |
221 | * | |
048b899c | 222 | * Compare two Ethernet addresses, returns true if equal, false otherwise. |
e550ba1a | 223 | * |
1c430a72 JB |
224 | * The function doesn't need any conditional branches and possibly uses |
225 | * word memory accesses on CPU allowing cheap unaligned memory reads. | |
048b899c | 226 | * arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 } |
1f87e235 | 227 | * |
048b899c | 228 | * Please note that alignment of addr1 & addr2 are only guaranteed to be 16 bits. |
1f87e235 ED |
229 | */ |
230 | ||
e550ba1a JP |
231 | static inline bool ether_addr_equal_64bits(const u8 addr1[6+2], |
232 | const u8 addr2[6+2]) | |
1f87e235 ED |
233 | { |
234 | #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS | |
235 | unsigned long fold = ((*(unsigned long *)addr1) ^ | |
236 | (*(unsigned long *)addr2)); | |
237 | ||
238 | if (sizeof(fold) == 8) | |
e550ba1a | 239 | return zap_last_2bytes(fold) == 0; |
1f87e235 ED |
240 | |
241 | fold |= zap_last_2bytes((*(unsigned long *)(addr1 + 4)) ^ | |
242 | (*(unsigned long *)(addr2 + 4))); | |
e550ba1a | 243 | return fold == 0; |
1f87e235 | 244 | #else |
e550ba1a | 245 | return ether_addr_equal(addr1, addr2); |
1f87e235 ED |
246 | #endif |
247 | } | |
f001fde5 JP |
248 | |
249 | /** | |
250 | * is_etherdev_addr - Tell if given Ethernet address belongs to the device. | |
251 | * @dev: Pointer to a device structure | |
252 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
253 | * | |
254 | * Compare passed address with all addresses of the device. Return true if the | |
255 | * address if one of the device addresses. | |
256 | * | |
e550ba1a | 257 | * Note that this function calls ether_addr_equal_64bits() so take care of |
f001fde5 JP |
258 | * the right padding. |
259 | */ | |
260 | static inline bool is_etherdev_addr(const struct net_device *dev, | |
261 | const u8 addr[6 + 2]) | |
262 | { | |
263 | struct netdev_hw_addr *ha; | |
e550ba1a | 264 | bool res = false; |
f001fde5 JP |
265 | |
266 | rcu_read_lock(); | |
267 | for_each_dev_addr(dev, ha) { | |
e550ba1a JP |
268 | res = ether_addr_equal_64bits(addr, ha->addr); |
269 | if (res) | |
f001fde5 JP |
270 | break; |
271 | } | |
272 | rcu_read_unlock(); | |
e550ba1a | 273 | return res; |
f001fde5 | 274 | } |
79165121 | 275 | #endif /* __KERNEL__ */ |
1da177e4 | 276 | |
aa4b9f53 HX |
277 | /** |
278 | * compare_ether_header - Compare two Ethernet headers | |
279 | * @a: Pointer to Ethernet header | |
280 | * @b: Pointer to Ethernet header | |
281 | * | |
048b899c | 282 | * Compare two Ethernet headers, returns 0 if equal. |
aa4b9f53 HX |
283 | * This assumes that the network header (i.e., IP header) is 4-byte |
284 | * aligned OR the platform can handle unaligned access. This is the | |
285 | * case for all packets coming into netif_receive_skb or similar | |
286 | * entry points. | |
287 | */ | |
288 | ||
40d0802b | 289 | static inline unsigned long compare_ether_header(const void *a, const void *b) |
aa4b9f53 | 290 | { |
40d0802b ED |
291 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
292 | unsigned long fold; | |
293 | ||
294 | /* | |
295 | * We want to compare 14 bytes: | |
296 | * [a0 ... a13] ^ [b0 ... b13] | |
297 | * Use two long XOR, ORed together, with an overlap of two bytes. | |
298 | * [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] | | |
299 | * [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13] | |
300 | * This means the [a6 a7] ^ [b6 b7] part is done two times. | |
301 | */ | |
302 | fold = *(unsigned long *)a ^ *(unsigned long *)b; | |
303 | fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6); | |
304 | return fold; | |
305 | #else | |
aa4b9f53 HX |
306 | u32 *a32 = (u32 *)((u8 *)a + 2); |
307 | u32 *b32 = (u32 *)((u8 *)b + 2); | |
308 | ||
309 | return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) | | |
310 | (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]); | |
40d0802b | 311 | #endif |
aa4b9f53 HX |
312 | } |
313 | ||
1da177e4 | 314 | #endif /* _LINUX_ETHERDEVICE_H */ |