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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 | * | |
21 | * WARNING: This move may well be temporary. This file will get merged with others RSN. | |
22 | * | |
23 | */ | |
24 | #ifndef _LINUX_ETHERDEVICE_H | |
25 | #define _LINUX_ETHERDEVICE_H | |
26 | ||
27 | #include <linux/if_ether.h> | |
bcd61272 | 28 | #include <linux/netdevice.h> |
1da177e4 | 29 | #include <linux/random.h> |
1f87e235 | 30 | #include <asm/unaligned.h> |
1da177e4 LT |
31 | |
32 | #ifdef __KERNEL__ | |
ab611487 | 33 | extern __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev); |
3b04ddde SH |
34 | extern const struct header_ops eth_header_ops; |
35 | ||
36 | extern int eth_header(struct sk_buff *skb, struct net_device *dev, | |
37 | unsigned short type, | |
38 | const void *daddr, const void *saddr, unsigned len); | |
39 | extern int eth_rebuild_header(struct sk_buff *skb); | |
40 | extern int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr); | |
41 | extern int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh); | |
42 | extern void eth_header_cache_update(struct hh_cache *hh, | |
43 | const struct net_device *dev, | |
44 | const unsigned char *haddr); | |
ccad637b SH |
45 | extern int eth_mac_addr(struct net_device *dev, void *p); |
46 | extern int eth_change_mtu(struct net_device *dev, int new_mtu); | |
47 | extern int eth_validate_addr(struct net_device *dev); | |
48 | ||
3b04ddde | 49 | |
1da177e4 | 50 | |
f25f4e44 PWJ |
51 | extern struct net_device *alloc_etherdev_mq(int sizeof_priv, unsigned int queue_count); |
52 | #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1) | |
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 LT |
59 | */ |
60 | static inline int is_zero_ether_addr(const u8 *addr) | |
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 ME |
71 | */ |
72 | static inline int is_multicast_ether_addr(const u8 *addr) | |
73 | { | |
88df8ef5 | 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 | */ | |
83 | static inline int is_local_ether_addr(const u8 *addr) | |
84 | { | |
85 | return (0x02 & addr[0]); | |
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 | */ | |
9bd481f8 JG |
94 | static inline int is_broadcast_ether_addr(const u8 *addr) |
95 | { | |
2407534f | 96 | return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff; |
9bd481f8 JG |
97 | } |
98 | ||
1da177e4 LT |
99 | /** |
100 | * is_valid_ether_addr - Determine if the given Ethernet address is valid | |
101 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
102 | * | |
103 | * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not | |
79165121 | 104 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
1da177e4 LT |
105 | * |
106 | * Return true if the address is valid. | |
107 | */ | |
108 | static inline int is_valid_ether_addr(const u8 *addr) | |
109 | { | |
79165121 ME |
110 | /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to |
111 | * explicitly check for it here. */ | |
112 | return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); | |
1da177e4 LT |
113 | } |
114 | ||
115 | /** | |
116 | * random_ether_addr - Generate software assigned random Ethernet address | |
117 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
118 | * | |
119 | * Generate a random Ethernet address (MAC) that is not multicast | |
120 | * and has the local assigned bit set. | |
121 | */ | |
122 | static inline void random_ether_addr(u8 *addr) | |
123 | { | |
124 | get_random_bytes (addr, ETH_ALEN); | |
125 | addr [0] &= 0xfe; /* clear multicast bit */ | |
126 | addr [0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
127 | } | |
360ac8e2 | 128 | |
c1f79426 SA |
129 | /** |
130 | * dev_hw_addr_random - Create random MAC and set device flag | |
131 | * @dev: pointer to net_device structure | |
132 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
133 | * | |
134 | * Generate random MAC to be used by a device and set addr_assign_type | |
135 | * so the state can be read by sysfs and be used by udev. | |
136 | */ | |
137 | static inline void dev_hw_addr_random(struct net_device *dev, u8 *hwaddr) | |
138 | { | |
139 | dev->addr_assign_type |= NET_ADDR_RANDOM; | |
140 | random_ether_addr(hwaddr); | |
141 | } | |
142 | ||
360ac8e2 SH |
143 | /** |
144 | * compare_ether_addr - Compare two Ethernet addresses | |
145 | * @addr1: Pointer to a six-byte array containing the Ethernet address | |
c2da8aca | 146 | * @addr2: Pointer other six-byte array containing the Ethernet address |
360ac8e2 SH |
147 | * |
148 | * Compare two ethernet addresses, returns 0 if equal | |
149 | */ | |
c2da8aca | 150 | static inline unsigned compare_ether_addr(const u8 *addr1, const u8 *addr2) |
360ac8e2 | 151 | { |
c2da8aca SH |
152 | const u16 *a = (const u16 *) addr1; |
153 | const u16 *b = (const u16 *) addr2; | |
360ac8e2 SH |
154 | |
155 | BUILD_BUG_ON(ETH_ALEN != 6); | |
156 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0; | |
157 | } | |
1f87e235 ED |
158 | |
159 | static inline unsigned long zap_last_2bytes(unsigned long value) | |
160 | { | |
161 | #ifdef __BIG_ENDIAN | |
162 | return value >> 16; | |
163 | #else | |
164 | return value << 16; | |
165 | #endif | |
166 | } | |
167 | ||
168 | /** | |
169 | * compare_ether_addr_64bits - Compare two Ethernet addresses | |
170 | * @addr1: Pointer to an array of 8 bytes | |
171 | * @addr2: Pointer to an other array of 8 bytes | |
172 | * | |
173 | * Compare two ethernet addresses, returns 0 if equal. | |
174 | * Same result than "memcmp(addr1, addr2, ETH_ALEN)" but without conditional | |
175 | * branches, and possibly long word memory accesses on CPU allowing cheap | |
176 | * unaligned memory reads. | |
177 | * arrays = { byte1, byte2, byte3, byte4, byte6, byte7, pad1, pad2} | |
178 | * | |
179 | * Please note that alignment of addr1 & addr2 is only guaranted to be 16 bits. | |
180 | */ | |
181 | ||
182 | static inline unsigned compare_ether_addr_64bits(const u8 addr1[6+2], | |
183 | const u8 addr2[6+2]) | |
184 | { | |
185 | #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS | |
186 | unsigned long fold = ((*(unsigned long *)addr1) ^ | |
187 | (*(unsigned long *)addr2)); | |
188 | ||
189 | if (sizeof(fold) == 8) | |
190 | return zap_last_2bytes(fold) != 0; | |
191 | ||
192 | fold |= zap_last_2bytes((*(unsigned long *)(addr1 + 4)) ^ | |
193 | (*(unsigned long *)(addr2 + 4))); | |
194 | return fold != 0; | |
195 | #else | |
196 | return compare_ether_addr(addr1, addr2); | |
197 | #endif | |
198 | } | |
f001fde5 JP |
199 | |
200 | /** | |
201 | * is_etherdev_addr - Tell if given Ethernet address belongs to the device. | |
202 | * @dev: Pointer to a device structure | |
203 | * @addr: Pointer to a six-byte array containing the Ethernet address | |
204 | * | |
205 | * Compare passed address with all addresses of the device. Return true if the | |
206 | * address if one of the device addresses. | |
207 | * | |
208 | * Note that this function calls compare_ether_addr_64bits() so take care of | |
209 | * the right padding. | |
210 | */ | |
211 | static inline bool is_etherdev_addr(const struct net_device *dev, | |
212 | const u8 addr[6 + 2]) | |
213 | { | |
214 | struct netdev_hw_addr *ha; | |
215 | int res = 1; | |
216 | ||
217 | rcu_read_lock(); | |
218 | for_each_dev_addr(dev, ha) { | |
219 | res = compare_ether_addr_64bits(addr, ha->addr); | |
220 | if (!res) | |
221 | break; | |
222 | } | |
223 | rcu_read_unlock(); | |
224 | return !res; | |
225 | } | |
79165121 | 226 | #endif /* __KERNEL__ */ |
1da177e4 | 227 | |
aa4b9f53 HX |
228 | /** |
229 | * compare_ether_header - Compare two Ethernet headers | |
230 | * @a: Pointer to Ethernet header | |
231 | * @b: Pointer to Ethernet header | |
232 | * | |
233 | * Compare two ethernet headers, returns 0 if equal. | |
234 | * This assumes that the network header (i.e., IP header) is 4-byte | |
235 | * aligned OR the platform can handle unaligned access. This is the | |
236 | * case for all packets coming into netif_receive_skb or similar | |
237 | * entry points. | |
238 | */ | |
239 | ||
240 | static inline int compare_ether_header(const void *a, const void *b) | |
241 | { | |
242 | u32 *a32 = (u32 *)((u8 *)a + 2); | |
243 | u32 *b32 = (u32 *)((u8 *)b + 2); | |
244 | ||
245 | return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) | | |
246 | (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]); | |
247 | } | |
248 | ||
1da177e4 | 249 | #endif /* _LINUX_ETHERDEVICE_H */ |