Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | */ |
| 22 | #ifndef _LINUX_ETHERDEVICE_H |
| 23 | #define _LINUX_ETHERDEVICE_H |
| 24 | |
| 25 | #include <linux/if_ether.h> |
Arnd Bergmann | bcd6127 | 2005-06-28 15:58:50 -0700 | [diff] [blame] | 26 | #include <linux/netdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/random.h> |
Eric Dumazet | 1f87e23 | 2008-11-23 23:24:32 -0800 | [diff] [blame] | 28 | #include <asm/unaligned.h> |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 29 | #include <asm/bitsperlong.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | #ifdef __KERNEL__ |
Joe Perches | f629d20 | 2013-09-26 14:48:15 -0700 | [diff] [blame] | 32 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev); |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 33 | extern const struct header_ops eth_header_ops; |
| 34 | |
Joe Perches | f629d20 | 2013-09-26 14:48:15 -0700 | [diff] [blame] | 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); |
Stephen Hemminger | ccad637 | 2008-11-19 22:42:31 -0800 | [diff] [blame] | 48 | |
Joe Perches | f629d20 | 2013-09-26 14:48:15 -0700 | [diff] [blame] | 49 | struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 50 | unsigned int rxqs); |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 51 | #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1) |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 52 | #define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
John Fastabend | b3343a2 | 2012-09-18 00:01:12 +0000 | [diff] [blame] | 54 | /* Reserved Ethernet Addresses per IEEE 802.1Q */ |
Ben Hutchings | 2bc8005 | 2012-11-01 09:12:02 +0000 | [diff] [blame] | 55 | static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) = |
| 56 | { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; |
John Fastabend | b3343a2 | 2012-09-18 00:01:12 +0000 | [diff] [blame] | 57 | |
| 58 | /** |
Ben Hutchings | 46acc46 | 2012-11-01 09:11:11 +0000 | [diff] [blame] | 59 | * is_link_local_ether_addr - Determine if given Ethernet address is link-local |
John Fastabend | b3343a2 | 2012-09-18 00:01:12 +0000 | [diff] [blame] | 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 | */ |
Ben Hutchings | 46acc46 | 2012-11-01 09:11:11 +0000 | [diff] [blame] | 65 | static inline bool is_link_local_ether_addr(const u8 *addr) |
John Fastabend | b3343a2 | 2012-09-18 00:01:12 +0000 | [diff] [blame] | 66 | { |
Ben Hutchings | 46acc46 | 2012-11-01 09:11:11 +0000 | [diff] [blame] | 67 | __be16 *a = (__be16 *)addr; |
Ben Hutchings | 2bc8005 | 2012-11-01 09:12:02 +0000 | [diff] [blame] | 68 | static const __be16 *b = (const __be16 *)eth_reserved_addr_base; |
John Fastabend | b3343a2 | 2012-09-18 00:01:12 +0000 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | /** |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | */ |
Joe Perches | b44907e | 2012-05-08 06:44:40 +0000 | [diff] [blame] | 80 | static inline bool is_zero_ether_addr(const u8 *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | { |
| 82 | return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]); |
| 83 | } |
| 84 | |
| 85 | /** |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 86 | * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 87 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 88 | * |
| 89 | * Return true if the address is a multicast address. |
Stephen Hemminger | 88df8ef | 2006-01-03 15:25:45 -0800 | [diff] [blame] | 90 | * By definition the broadcast address is also a multicast address. |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 91 | */ |
Joe Perches | b44907e | 2012-05-08 06:44:40 +0000 | [diff] [blame] | 92 | static inline bool is_multicast_ether_addr(const u8 *addr) |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 93 | { |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 94 | return 0x01 & addr[0]; |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 95 | } |
| 96 | |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 97 | /** |
Randy Dunlap | bc2cda1 | 2008-02-13 15:03:25 -0800 | [diff] [blame] | 98 | * is_local_ether_addr - Determine if the Ethernet address is locally-assigned one (IEEE 802). |
Paolo 'Blaisorblade' Giarrusso | e024715 | 2007-05-06 14:51:13 -0700 | [diff] [blame] | 99 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 100 | * |
| 101 | * Return true if the address is a local address. |
| 102 | */ |
Joe Perches | b44907e | 2012-05-08 06:44:40 +0000 | [diff] [blame] | 103 | static inline bool is_local_ether_addr(const u8 *addr) |
Paolo 'Blaisorblade' Giarrusso | e024715 | 2007-05-06 14:51:13 -0700 | [diff] [blame] | 104 | { |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 105 | return 0x02 & addr[0]; |
Paolo 'Blaisorblade' Giarrusso | e024715 | 2007-05-06 14:51:13 -0700 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | /** |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 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 | */ |
Joe Perches | b44907e | 2012-05-08 06:44:40 +0000 | [diff] [blame] | 114 | static inline bool is_broadcast_ether_addr(const u8 *addr) |
Jeff Garzik | 9bd481f | 2005-06-28 01:46:35 -0400 | [diff] [blame] | 115 | { |
Stephen Hemminger | 2407534 | 2005-11-01 16:52:11 -0800 | [diff] [blame] | 116 | return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff; |
Jeff Garzik | 9bd481f | 2005-06-28 01:46:35 -0400 | [diff] [blame] | 117 | } |
| 118 | |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 119 | /** |
Tobias Klauser | 51e7eed7 | 2011-01-12 22:14:56 +0000 | [diff] [blame] | 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 | */ |
Joe Perches | b44907e | 2012-05-08 06:44:40 +0000 | [diff] [blame] | 125 | static inline bool is_unicast_ether_addr(const u8 *addr) |
Tobias Klauser | 51e7eed7 | 2011-01-12 22:14:56 +0000 | [diff] [blame] | 126 | { |
| 127 | return !is_multicast_ether_addr(addr); |
| 128 | } |
| 129 | |
| 130 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 135 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | * |
| 137 | * Return true if the address is valid. |
| 138 | */ |
Joe Perches | b44907e | 2012-05-08 06:44:40 +0000 | [diff] [blame] | 139 | static inline bool is_valid_ether_addr(const u8 *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | { |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | /** |
Joe Perches | 0a4dd59 | 2012-07-12 19:33:05 +0000 | [diff] [blame] | 147 | * eth_random_addr - Generate software assigned random Ethernet address |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Joe Perches | 0a4dd59 | 2012-07-12 19:33:05 +0000 | [diff] [blame] | 153 | static inline void eth_random_addr(u8 *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | { |
Joe Perches | 0a4dd59 | 2012-07-12 19:33:05 +0000 | [diff] [blame] | 155 | get_random_bytes(addr, ETH_ALEN); |
| 156 | addr[0] &= 0xfe; /* clear multicast bit */ |
| 157 | addr[0] |= 0x02; /* set local assignment bit (IEEE802) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | } |
Stephen Hemminger | 360ac8e | 2005-10-25 15:03:41 -0700 | [diff] [blame] | 159 | |
Joe Perches | 0a4dd59 | 2012-07-12 19:33:05 +0000 | [diff] [blame] | 160 | #define random_ether_addr(addr) eth_random_addr(addr) |
| 161 | |
Stephen Hemminger | 360ac8e | 2005-10-25 15:03:41 -0700 | [diff] [blame] | 162 | /** |
Johannes Berg | ad7eee9 | 2012-07-10 06:18:44 +0000 | [diff] [blame] | 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 | |
| 173 | /** |
Duan Jiong | 6d57e90 | 2012-09-08 16:32:28 +0000 | [diff] [blame] | 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 | |
| 184 | /** |
Danny Kukawka | 1a0d6ae | 2012-02-09 09:48:54 +0000 | [diff] [blame] | 185 | * eth_hw_addr_random - Generate software assigned random Ethernet and |
| 186 | * set device flag |
Stefan Assmann | c1f7942 | 2010-07-22 02:50:21 +0000 | [diff] [blame] | 187 | * @dev: pointer to net_device structure |
Stefan Assmann | c1f7942 | 2010-07-22 02:50:21 +0000 | [diff] [blame] | 188 | * |
Danny Kukawka | 1a0d6ae | 2012-02-09 09:48:54 +0000 | [diff] [blame] | 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. |
Stefan Assmann | c1f7942 | 2010-07-22 02:50:21 +0000 | [diff] [blame] | 192 | */ |
Danny Kukawka | 1a0d6ae | 2012-02-09 09:48:54 +0000 | [diff] [blame] | 193 | static inline void eth_hw_addr_random(struct net_device *dev) |
Stefan Assmann | c1f7942 | 2010-07-22 02:50:21 +0000 | [diff] [blame] | 194 | { |
Jiri Pirko | e41b2d7 | 2013-01-01 03:30:15 +0000 | [diff] [blame] | 195 | dev->addr_assign_type = NET_ADDR_RANDOM; |
Joe Perches | 0a4dd59 | 2012-07-12 19:33:05 +0000 | [diff] [blame] | 196 | eth_random_addr(dev->dev_addr); |
Stefan Assmann | c1f7942 | 2010-07-22 02:50:21 +0000 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | /** |
Bjørn Mork | 83a093b | 2013-08-30 18:08:44 +0200 | [diff] [blame] | 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 | |
| 214 | /** |
Joe Perches | a599b0f | 2012-05-08 18:56:45 +0000 | [diff] [blame] | 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 | * |
stephen hemminger | 048b899 | 2012-05-17 05:17:28 +0000 | [diff] [blame] | 219 | * Compare two Ethernet addresses, returns true if equal |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 220 | * |
| 221 | * Please note: addr1 & addr2 must both be aligned to u16. |
Joe Perches | a599b0f | 2012-05-08 18:56:45 +0000 | [diff] [blame] | 222 | */ |
| 223 | static inline bool ether_addr_equal(const u8 *addr1, const u8 *addr2) |
| 224 | { |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 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))); |
Joe Perches | a599b0f | 2012-05-08 18:56:45 +0000 | [diff] [blame] | 228 | |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 229 | return fold == 0; |
Eric Dumazet | 1f87e23 | 2008-11-23 23:24:32 -0800 | [diff] [blame] | 230 | #else |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 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; |
Eric Dumazet | 1f87e23 | 2008-11-23 23:24:32 -0800 | [diff] [blame] | 235 | #endif |
| 236 | } |
| 237 | |
| 238 | /** |
Joe Perches | baf523c | 2012-05-09 17:04:03 +0000 | [diff] [blame] | 239 | * ether_addr_equal_64bits - Compare two Ethernet addresses |
| 240 | * @addr1: Pointer to an array of 8 bytes |
| 241 | * @addr2: Pointer to an other array of 8 bytes |
| 242 | * |
stephen hemminger | 048b899 | 2012-05-17 05:17:28 +0000 | [diff] [blame] | 243 | * Compare two Ethernet addresses, returns true if equal, false otherwise. |
Joe Perches | baf523c | 2012-05-09 17:04:03 +0000 | [diff] [blame] | 244 | * |
| 245 | * The function doesn't need any conditional branches and possibly uses |
| 246 | * word memory accesses on CPU allowing cheap unaligned memory reads. |
stephen hemminger | 048b899 | 2012-05-17 05:17:28 +0000 | [diff] [blame] | 247 | * arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 } |
Joe Perches | baf523c | 2012-05-09 17:04:03 +0000 | [diff] [blame] | 248 | * |
stephen hemminger | 048b899 | 2012-05-17 05:17:28 +0000 | [diff] [blame] | 249 | * Please note that alignment of addr1 & addr2 are only guaranteed to be 16 bits. |
Joe Perches | baf523c | 2012-05-09 17:04:03 +0000 | [diff] [blame] | 250 | */ |
| 251 | |
| 252 | static inline bool ether_addr_equal_64bits(const u8 addr1[6+2], |
| 253 | const u8 addr2[6+2]) |
| 254 | { |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 255 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 256 | u64 fold = (*(const u64 *)addr1) ^ (*(const u64 *)addr2); |
Joe Perches | e550ba1 | 2012-05-11 12:21:06 +0000 | [diff] [blame] | 257 | |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 258 | #ifdef __BIG_ENDIAN |
| 259 | return (fold >> 16) == 0; |
| 260 | #else |
| 261 | return (fold << 16) == 0; |
| 262 | #endif |
Joe Perches | e550ba1 | 2012-05-11 12:21:06 +0000 | [diff] [blame] | 263 | #else |
| 264 | return ether_addr_equal(addr1, addr2); |
| 265 | #endif |
Joe Perches | baf523c | 2012-05-09 17:04:03 +0000 | [diff] [blame] | 266 | } |
| 267 | |
| 268 | /** |
Joe Perches | 73eaef8 | 2013-12-06 14:21:01 -0800 | [diff] [blame^] | 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 | |
| 286 | /** |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 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 | * |
Joe Perches | e550ba1 | 2012-05-11 12:21:06 +0000 | [diff] [blame] | 294 | * Note that this function calls ether_addr_equal_64bits() so take care of |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 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; |
Joe Perches | e550ba1 | 2012-05-11 12:21:06 +0000 | [diff] [blame] | 301 | bool res = false; |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 302 | |
| 303 | rcu_read_lock(); |
| 304 | for_each_dev_addr(dev, ha) { |
Joe Perches | e550ba1 | 2012-05-11 12:21:06 +0000 | [diff] [blame] | 305 | res = ether_addr_equal_64bits(addr, ha->addr); |
| 306 | if (res) |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 307 | break; |
| 308 | } |
| 309 | rcu_read_unlock(); |
Joe Perches | e550ba1 | 2012-05-11 12:21:06 +0000 | [diff] [blame] | 310 | return res; |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 311 | } |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 312 | #endif /* __KERNEL__ */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
Herbert Xu | aa4b9f5 | 2009-02-08 18:00:37 +0000 | [diff] [blame] | 314 | /** |
| 315 | * compare_ether_header - Compare two Ethernet headers |
| 316 | * @a: Pointer to Ethernet header |
| 317 | * @b: Pointer to Ethernet header |
| 318 | * |
stephen hemminger | 048b899 | 2012-05-17 05:17:28 +0000 | [diff] [blame] | 319 | * Compare two Ethernet headers, returns 0 if equal. |
Herbert Xu | aa4b9f5 | 2009-02-08 18:00:37 +0000 | [diff] [blame] | 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 | |
Eric Dumazet | 40d0802 | 2010-08-26 22:03:08 -0700 | [diff] [blame] | 326 | static inline unsigned long compare_ether_header(const void *a, const void *b) |
Herbert Xu | aa4b9f5 | 2009-02-08 18:00:37 +0000 | [diff] [blame] | 327 | { |
Eric Dumazet | 40d0802 | 2010-08-26 22:03:08 -0700 | [diff] [blame] | 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 |
Herbert Xu | aa4b9f5 | 2009-02-08 18:00:37 +0000 | [diff] [blame] | 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]); |
Eric Dumazet | 40d0802 | 2010-08-26 22:03:08 -0700 | [diff] [blame] | 348 | #endif |
Herbert Xu | aa4b9f5 | 2009-02-08 18:00:37 +0000 | [diff] [blame] | 349 | } |
| 350 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | #endif /* _LINUX_ETHERDEVICE_H */ |