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__ |
Alexander Duyck | 56193d1 | 2014-09-05 19:20:26 -0400 | [diff] [blame] | 32 | u32 eth_get_headlen(void *data, unsigned int max_len); |
Joe Perches | f629d20 | 2013-09-26 14:48:15 -0700 | [diff] [blame] | 33 | __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev); |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 34 | extern const struct header_ops eth_header_ops; |
| 35 | |
Joe Perches | f629d20 | 2013-09-26 14:48:15 -0700 | [diff] [blame] | 36 | int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, |
| 37 | const void *daddr, const void *saddr, unsigned len); |
| 38 | int eth_rebuild_header(struct sk_buff *skb); |
| 39 | int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr); |
| 40 | int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, |
| 41 | __be16 type); |
| 42 | void eth_header_cache_update(struct hh_cache *hh, const struct net_device *dev, |
| 43 | const unsigned char *haddr); |
| 44 | int eth_prepare_mac_addr_change(struct net_device *dev, void *p); |
| 45 | void eth_commit_mac_addr_change(struct net_device *dev, void *p); |
| 46 | int eth_mac_addr(struct net_device *dev, void *p); |
| 47 | int eth_change_mtu(struct net_device *dev, int new_mtu); |
| 48 | int eth_validate_addr(struct net_device *dev); |
Stephen Hemminger | ccad637 | 2008-11-19 22:42:31 -0800 | [diff] [blame] | 49 | |
Joe Perches | f629d20 | 2013-09-26 14:48:15 -0700 | [diff] [blame] | 50 | struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 51 | unsigned int rxqs); |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 52 | #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1) |
Tom Herbert | 36909ea | 2011-01-09 19:36:31 +0000 | [diff] [blame] | 53 | #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] | 54 | |
John Fastabend | b3343a2 | 2012-09-18 00:01:12 +0000 | [diff] [blame] | 55 | /* Reserved Ethernet Addresses per IEEE 802.1Q */ |
Ben Hutchings | 2bc8005 | 2012-11-01 09:12:02 +0000 | [diff] [blame] | 56 | static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) = |
| 57 | { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; |
John Fastabend | b3343a2 | 2012-09-18 00:01:12 +0000 | [diff] [blame] | 58 | |
| 59 | /** |
Ben Hutchings | 46acc46 | 2012-11-01 09:11:11 +0000 | [diff] [blame] | 60 | * 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] | 61 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 62 | * |
| 63 | * Return true if address is link local reserved addr (01:80:c2:00:00:0X) per |
| 64 | * IEEE 802.1Q 8.6.3 Frame filtering. |
Joe Perches | 2c722fe | 2013-12-06 15:44:21 -0800 | [diff] [blame] | 65 | * |
| 66 | * Please note: addr must be aligned to u16. |
John Fastabend | b3343a2 | 2012-09-18 00:01:12 +0000 | [diff] [blame] | 67 | */ |
Ben Hutchings | 46acc46 | 2012-11-01 09:11:11 +0000 | [diff] [blame] | 68 | static inline bool is_link_local_ether_addr(const u8 *addr) |
John Fastabend | b3343a2 | 2012-09-18 00:01:12 +0000 | [diff] [blame] | 69 | { |
Ben Hutchings | 46acc46 | 2012-11-01 09:11:11 +0000 | [diff] [blame] | 70 | __be16 *a = (__be16 *)addr; |
Ben Hutchings | 2bc8005 | 2012-11-01 09:12:02 +0000 | [diff] [blame] | 71 | static const __be16 *b = (const __be16 *)eth_reserved_addr_base; |
John Fastabend | b3343a2 | 2012-09-18 00:01:12 +0000 | [diff] [blame] | 72 | static const __be16 m = cpu_to_be16(0xfff0); |
| 73 | |
Joe Perches | 2c722fe | 2013-12-06 15:44:21 -0800 | [diff] [blame] | 74 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
| 75 | return (((*(const u32 *)addr) ^ (*(const u32 *)b)) | |
| 76 | ((a[2] ^ b[2]) & m)) == 0; |
| 77 | #else |
John Fastabend | b3343a2 | 2012-09-18 00:01:12 +0000 | [diff] [blame] | 78 | return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0; |
Joe Perches | 2c722fe | 2013-12-06 15:44:21 -0800 | [diff] [blame] | 79 | #endif |
John Fastabend | b3343a2 | 2012-09-18 00:01:12 +0000 | [diff] [blame] | 80 | } |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | /** |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 83 | * is_zero_ether_addr - Determine if give Ethernet address is all zeros. |
| 84 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 85 | * |
| 86 | * Return true if the address is all zeroes. |
Joe Perches | 2c722fe | 2013-12-06 15:44:21 -0800 | [diff] [blame] | 87 | * |
| 88 | * Please note: addr must be aligned to u16. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | */ |
Joe Perches | b44907e | 2012-05-08 06:44:40 +0000 | [diff] [blame] | 90 | static inline bool is_zero_ether_addr(const u8 *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | { |
Joe Perches | 2c722fe | 2013-12-06 15:44:21 -0800 | [diff] [blame] | 92 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
| 93 | return ((*(const u32 *)addr) | (*(const u16 *)(addr + 4))) == 0; |
| 94 | #else |
| 95 | return (*(const u16 *)(addr + 0) | |
| 96 | *(const u16 *)(addr + 2) | |
| 97 | *(const u16 *)(addr + 4)) == 0; |
| 98 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | /** |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 102 | * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 103 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 104 | * |
| 105 | * Return true if the address is a multicast address. |
Stephen Hemminger | 88df8ef | 2006-01-03 15:25:45 -0800 | [diff] [blame] | 106 | * By definition the broadcast address is also a multicast address. |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 107 | */ |
Joe Perches | b44907e | 2012-05-08 06:44:40 +0000 | [diff] [blame] | 108 | static inline bool is_multicast_ether_addr(const u8 *addr) |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 109 | { |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 110 | return 0x01 & addr[0]; |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 111 | } |
| 112 | |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 113 | /** |
Randy Dunlap | bc2cda1 | 2008-02-13 15:03:25 -0800 | [diff] [blame] | 114 | * 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] | 115 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 116 | * |
| 117 | * Return true if the address is a local address. |
| 118 | */ |
Joe Perches | b44907e | 2012-05-08 06:44:40 +0000 | [diff] [blame] | 119 | static inline bool is_local_ether_addr(const u8 *addr) |
Paolo 'Blaisorblade' Giarrusso | e024715 | 2007-05-06 14:51:13 -0700 | [diff] [blame] | 120 | { |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 121 | return 0x02 & addr[0]; |
Paolo 'Blaisorblade' Giarrusso | e024715 | 2007-05-06 14:51:13 -0700 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | /** |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 125 | * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast |
| 126 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 127 | * |
| 128 | * Return true if the address is the broadcast address. |
Joe Perches | 2c722fe | 2013-12-06 15:44:21 -0800 | [diff] [blame] | 129 | * |
| 130 | * Please note: addr must be aligned to u16. |
Stephen Hemminger | c2da8ac | 2005-11-01 17:05:09 -0800 | [diff] [blame] | 131 | */ |
Joe Perches | b44907e | 2012-05-08 06:44:40 +0000 | [diff] [blame] | 132 | static inline bool is_broadcast_ether_addr(const u8 *addr) |
Jeff Garzik | 9bd481f | 2005-06-28 01:46:35 -0400 | [diff] [blame] | 133 | { |
Joe Perches | 2c722fe | 2013-12-06 15:44:21 -0800 | [diff] [blame] | 134 | return (*(const u16 *)(addr + 0) & |
| 135 | *(const u16 *)(addr + 2) & |
| 136 | *(const u16 *)(addr + 4)) == 0xffff; |
Jeff Garzik | 9bd481f | 2005-06-28 01:46:35 -0400 | [diff] [blame] | 137 | } |
| 138 | |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 139 | /** |
Tobias Klauser | 51e7eed7 | 2011-01-12 22:14:56 +0000 | [diff] [blame] | 140 | * is_unicast_ether_addr - Determine if the Ethernet address is unicast |
| 141 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 142 | * |
| 143 | * Return true if the address is a unicast address. |
| 144 | */ |
Joe Perches | b44907e | 2012-05-08 06:44:40 +0000 | [diff] [blame] | 145 | static inline bool is_unicast_ether_addr(const u8 *addr) |
Tobias Klauser | 51e7eed7 | 2011-01-12 22:14:56 +0000 | [diff] [blame] | 146 | { |
| 147 | return !is_multicast_ether_addr(addr); |
| 148 | } |
| 149 | |
| 150 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | * is_valid_ether_addr - Determine if the given Ethernet address is valid |
| 152 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 153 | * |
| 154 | * 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] | 155 | * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | * |
| 157 | * Return true if the address is valid. |
Joe Perches | 2c722fe | 2013-12-06 15:44:21 -0800 | [diff] [blame] | 158 | * |
| 159 | * Please note: addr must be aligned to u16. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | */ |
Joe Perches | b44907e | 2012-05-08 06:44:40 +0000 | [diff] [blame] | 161 | static inline bool is_valid_ether_addr(const u8 *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | { |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 163 | /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to |
| 164 | * explicitly check for it here. */ |
| 165 | return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | } |
| 167 | |
| 168 | /** |
Joe Perches | 0a4dd59 | 2012-07-12 19:33:05 +0000 | [diff] [blame] | 169 | * eth_random_addr - Generate software assigned random Ethernet address |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 171 | * |
| 172 | * Generate a random Ethernet address (MAC) that is not multicast |
| 173 | * and has the local assigned bit set. |
| 174 | */ |
Joe Perches | 0a4dd59 | 2012-07-12 19:33:05 +0000 | [diff] [blame] | 175 | static inline void eth_random_addr(u8 *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | { |
Joe Perches | 0a4dd59 | 2012-07-12 19:33:05 +0000 | [diff] [blame] | 177 | get_random_bytes(addr, ETH_ALEN); |
| 178 | addr[0] &= 0xfe; /* clear multicast bit */ |
| 179 | addr[0] |= 0x02; /* set local assignment bit (IEEE802) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | } |
Stephen Hemminger | 360ac8e | 2005-10-25 15:03:41 -0700 | [diff] [blame] | 181 | |
Joe Perches | 0a4dd59 | 2012-07-12 19:33:05 +0000 | [diff] [blame] | 182 | #define random_ether_addr(addr) eth_random_addr(addr) |
| 183 | |
Stephen Hemminger | 360ac8e | 2005-10-25 15:03:41 -0700 | [diff] [blame] | 184 | /** |
Johannes Berg | ad7eee9 | 2012-07-10 06:18:44 +0000 | [diff] [blame] | 185 | * eth_broadcast_addr - Assign broadcast address |
| 186 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 187 | * |
| 188 | * Assign the broadcast address to the given address array. |
| 189 | */ |
| 190 | static inline void eth_broadcast_addr(u8 *addr) |
| 191 | { |
| 192 | memset(addr, 0xff, ETH_ALEN); |
| 193 | } |
| 194 | |
| 195 | /** |
Duan Jiong | 6d57e90 | 2012-09-08 16:32:28 +0000 | [diff] [blame] | 196 | * eth_zero_addr - Assign zero address |
| 197 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 198 | * |
| 199 | * Assign the zero address to the given address array. |
| 200 | */ |
| 201 | static inline void eth_zero_addr(u8 *addr) |
| 202 | { |
| 203 | memset(addr, 0x00, ETH_ALEN); |
| 204 | } |
| 205 | |
| 206 | /** |
Danny Kukawka | 1a0d6ae | 2012-02-09 09:48:54 +0000 | [diff] [blame] | 207 | * eth_hw_addr_random - Generate software assigned random Ethernet and |
| 208 | * set device flag |
Stefan Assmann | c1f7942 | 2010-07-22 02:50:21 +0000 | [diff] [blame] | 209 | * @dev: pointer to net_device structure |
Stefan Assmann | c1f7942 | 2010-07-22 02:50:21 +0000 | [diff] [blame] | 210 | * |
Danny Kukawka | 1a0d6ae | 2012-02-09 09:48:54 +0000 | [diff] [blame] | 211 | * Generate a random Ethernet address (MAC) to be used by a net device |
| 212 | * and set addr_assign_type so the state can be read by sysfs and be |
| 213 | * used by userspace. |
Stefan Assmann | c1f7942 | 2010-07-22 02:50:21 +0000 | [diff] [blame] | 214 | */ |
Danny Kukawka | 1a0d6ae | 2012-02-09 09:48:54 +0000 | [diff] [blame] | 215 | static inline void eth_hw_addr_random(struct net_device *dev) |
Stefan Assmann | c1f7942 | 2010-07-22 02:50:21 +0000 | [diff] [blame] | 216 | { |
Jiri Pirko | e41b2d7 | 2013-01-01 03:30:15 +0000 | [diff] [blame] | 217 | dev->addr_assign_type = NET_ADDR_RANDOM; |
Joe Perches | 0a4dd59 | 2012-07-12 19:33:05 +0000 | [diff] [blame] | 218 | eth_random_addr(dev->dev_addr); |
Stefan Assmann | c1f7942 | 2010-07-22 02:50:21 +0000 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | /** |
Joe Perches | 286ab72 | 2014-01-14 15:18:47 -0800 | [diff] [blame] | 222 | * ether_addr_copy - Copy an Ethernet address |
| 223 | * @dst: Pointer to a six-byte array Ethernet address destination |
| 224 | * @src: Pointer to a six-byte array Ethernet address source |
| 225 | * |
| 226 | * Please note: dst & src must both be aligned to u16. |
| 227 | */ |
| 228 | static inline void ether_addr_copy(u8 *dst, const u8 *src) |
| 229 | { |
| 230 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
| 231 | *(u32 *)dst = *(const u32 *)src; |
| 232 | *(u16 *)(dst + 4) = *(const u16 *)(src + 4); |
| 233 | #else |
| 234 | u16 *a = (u16 *)dst; |
| 235 | const u16 *b = (const u16 *)src; |
| 236 | |
| 237 | a[0] = b[0]; |
| 238 | a[1] = b[1]; |
| 239 | a[2] = b[2]; |
| 240 | #endif |
| 241 | } |
| 242 | |
| 243 | /** |
Bjørn Mork | 83a093b | 2013-08-30 18:08:44 +0200 | [diff] [blame] | 244 | * eth_hw_addr_inherit - Copy dev_addr from another net_device |
| 245 | * @dst: pointer to net_device to copy dev_addr to |
| 246 | * @src: pointer to net_device to copy dev_addr from |
| 247 | * |
| 248 | * Copy the Ethernet address from one net_device to another along with |
| 249 | * the address attributes (addr_assign_type). |
| 250 | */ |
| 251 | static inline void eth_hw_addr_inherit(struct net_device *dst, |
| 252 | struct net_device *src) |
| 253 | { |
| 254 | dst->addr_assign_type = src->addr_assign_type; |
Joe Perches | 286ab72 | 2014-01-14 15:18:47 -0800 | [diff] [blame] | 255 | ether_addr_copy(dst->dev_addr, src->dev_addr); |
Bjørn Mork | 83a093b | 2013-08-30 18:08:44 +0200 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | /** |
Joe Perches | a599b0f | 2012-05-08 18:56:45 +0000 | [diff] [blame] | 259 | * ether_addr_equal - Compare two Ethernet addresses |
| 260 | * @addr1: Pointer to a six-byte array containing the Ethernet address |
| 261 | * @addr2: Pointer other six-byte array containing the Ethernet address |
| 262 | * |
stephen hemminger | 048b899 | 2012-05-17 05:17:28 +0000 | [diff] [blame] | 263 | * Compare two Ethernet addresses, returns true if equal |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 264 | * |
| 265 | * Please note: addr1 & addr2 must both be aligned to u16. |
Joe Perches | a599b0f | 2012-05-08 18:56:45 +0000 | [diff] [blame] | 266 | */ |
| 267 | static inline bool ether_addr_equal(const u8 *addr1, const u8 *addr2) |
| 268 | { |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 269 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
| 270 | u32 fold = ((*(const u32 *)addr1) ^ (*(const u32 *)addr2)) | |
| 271 | ((*(const u16 *)(addr1 + 4)) ^ (*(const u16 *)(addr2 + 4))); |
Joe Perches | a599b0f | 2012-05-08 18:56:45 +0000 | [diff] [blame] | 272 | |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 273 | return fold == 0; |
Eric Dumazet | 1f87e23 | 2008-11-23 23:24:32 -0800 | [diff] [blame] | 274 | #else |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 275 | const u16 *a = (const u16 *)addr1; |
| 276 | const u16 *b = (const u16 *)addr2; |
| 277 | |
| 278 | 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] | 279 | #endif |
| 280 | } |
| 281 | |
| 282 | /** |
Joe Perches | baf523c | 2012-05-09 17:04:03 +0000 | [diff] [blame] | 283 | * ether_addr_equal_64bits - Compare two Ethernet addresses |
| 284 | * @addr1: Pointer to an array of 8 bytes |
| 285 | * @addr2: Pointer to an other array of 8 bytes |
| 286 | * |
stephen hemminger | 048b899 | 2012-05-17 05:17:28 +0000 | [diff] [blame] | 287 | * Compare two Ethernet addresses, returns true if equal, false otherwise. |
Joe Perches | baf523c | 2012-05-09 17:04:03 +0000 | [diff] [blame] | 288 | * |
| 289 | * The function doesn't need any conditional branches and possibly uses |
| 290 | * word memory accesses on CPU allowing cheap unaligned memory reads. |
stephen hemminger | 048b899 | 2012-05-17 05:17:28 +0000 | [diff] [blame] | 291 | * arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 } |
Joe Perches | baf523c | 2012-05-09 17:04:03 +0000 | [diff] [blame] | 292 | * |
stephen hemminger | 048b899 | 2012-05-17 05:17:28 +0000 | [diff] [blame] | 293 | * 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] | 294 | */ |
| 295 | |
| 296 | static inline bool ether_addr_equal_64bits(const u8 addr1[6+2], |
| 297 | const u8 addr2[6+2]) |
| 298 | { |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 299 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 300 | u64 fold = (*(const u64 *)addr1) ^ (*(const u64 *)addr2); |
Joe Perches | e550ba1 | 2012-05-11 12:21:06 +0000 | [diff] [blame] | 301 | |
Joe Perches | 0d74c42 | 2013-12-05 14:54:38 -0800 | [diff] [blame] | 302 | #ifdef __BIG_ENDIAN |
| 303 | return (fold >> 16) == 0; |
| 304 | #else |
| 305 | return (fold << 16) == 0; |
| 306 | #endif |
Joe Perches | e550ba1 | 2012-05-11 12:21:06 +0000 | [diff] [blame] | 307 | #else |
| 308 | return ether_addr_equal(addr1, addr2); |
| 309 | #endif |
Joe Perches | baf523c | 2012-05-09 17:04:03 +0000 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | /** |
Joe Perches | 73eaef8 | 2013-12-06 14:21:01 -0800 | [diff] [blame] | 313 | * ether_addr_equal_unaligned - Compare two not u16 aligned Ethernet addresses |
| 314 | * @addr1: Pointer to a six-byte array containing the Ethernet address |
| 315 | * @addr2: Pointer other six-byte array containing the Ethernet address |
| 316 | * |
| 317 | * Compare two Ethernet addresses, returns true if equal |
| 318 | * |
| 319 | * Please note: Use only when any Ethernet address may not be u16 aligned. |
| 320 | */ |
| 321 | static inline bool ether_addr_equal_unaligned(const u8 *addr1, const u8 *addr2) |
| 322 | { |
| 323 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
| 324 | return ether_addr_equal(addr1, addr2); |
| 325 | #else |
| 326 | return memcmp(addr1, addr2, ETH_ALEN) == 0; |
| 327 | #endif |
| 328 | } |
| 329 | |
| 330 | /** |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 331 | * is_etherdev_addr - Tell if given Ethernet address belongs to the device. |
| 332 | * @dev: Pointer to a device structure |
| 333 | * @addr: Pointer to a six-byte array containing the Ethernet address |
| 334 | * |
| 335 | * Compare passed address with all addresses of the device. Return true if the |
| 336 | * address if one of the device addresses. |
| 337 | * |
Joe Perches | e550ba1 | 2012-05-11 12:21:06 +0000 | [diff] [blame] | 338 | * 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] | 339 | * the right padding. |
| 340 | */ |
| 341 | static inline bool is_etherdev_addr(const struct net_device *dev, |
| 342 | const u8 addr[6 + 2]) |
| 343 | { |
| 344 | struct netdev_hw_addr *ha; |
Joe Perches | e550ba1 | 2012-05-11 12:21:06 +0000 | [diff] [blame] | 345 | bool res = false; |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 346 | |
| 347 | rcu_read_lock(); |
| 348 | for_each_dev_addr(dev, ha) { |
Joe Perches | e550ba1 | 2012-05-11 12:21:06 +0000 | [diff] [blame] | 349 | res = ether_addr_equal_64bits(addr, ha->addr); |
| 350 | if (res) |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 351 | break; |
| 352 | } |
| 353 | rcu_read_unlock(); |
Joe Perches | e550ba1 | 2012-05-11 12:21:06 +0000 | [diff] [blame] | 354 | return res; |
Jiri Pirko | f001fde | 2009-05-05 02:48:28 +0000 | [diff] [blame] | 355 | } |
Michael Ellerman | 79165121 | 2005-05-29 20:24:30 -0700 | [diff] [blame] | 356 | #endif /* __KERNEL__ */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
Herbert Xu | aa4b9f5 | 2009-02-08 18:00:37 +0000 | [diff] [blame] | 358 | /** |
| 359 | * compare_ether_header - Compare two Ethernet headers |
| 360 | * @a: Pointer to Ethernet header |
| 361 | * @b: Pointer to Ethernet header |
| 362 | * |
stephen hemminger | 048b899 | 2012-05-17 05:17:28 +0000 | [diff] [blame] | 363 | * Compare two Ethernet headers, returns 0 if equal. |
Herbert Xu | aa4b9f5 | 2009-02-08 18:00:37 +0000 | [diff] [blame] | 364 | * This assumes that the network header (i.e., IP header) is 4-byte |
| 365 | * aligned OR the platform can handle unaligned access. This is the |
| 366 | * case for all packets coming into netif_receive_skb or similar |
| 367 | * entry points. |
| 368 | */ |
| 369 | |
Eric Dumazet | 40d0802 | 2010-08-26 22:03:08 -0700 | [diff] [blame] | 370 | 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] | 371 | { |
Eric Dumazet | 40d0802 | 2010-08-26 22:03:08 -0700 | [diff] [blame] | 372 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 373 | unsigned long fold; |
| 374 | |
| 375 | /* |
| 376 | * We want to compare 14 bytes: |
| 377 | * [a0 ... a13] ^ [b0 ... b13] |
| 378 | * Use two long XOR, ORed together, with an overlap of two bytes. |
| 379 | * [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] | |
| 380 | * [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13] |
| 381 | * This means the [a6 a7] ^ [b6 b7] part is done two times. |
| 382 | */ |
| 383 | fold = *(unsigned long *)a ^ *(unsigned long *)b; |
| 384 | fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6); |
| 385 | return fold; |
| 386 | #else |
Herbert Xu | aa4b9f5 | 2009-02-08 18:00:37 +0000 | [diff] [blame] | 387 | u32 *a32 = (u32 *)((u8 *)a + 2); |
| 388 | u32 *b32 = (u32 *)((u8 *)b + 2); |
| 389 | |
| 390 | return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) | |
| 391 | (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]); |
Eric Dumazet | 40d0802 | 2010-08-26 22:03:08 -0700 | [diff] [blame] | 392 | #endif |
Herbert Xu | aa4b9f5 | 2009-02-08 18:00:37 +0000 | [diff] [blame] | 393 | } |
| 394 | |
Alexander Duyck | 9c0c112 | 2014-12-03 08:17:33 -0800 | [diff] [blame] | 395 | /** |
| 396 | * eth_skb_pad - Pad buffer to mininum number of octets for Ethernet frame |
| 397 | * @skb: Buffer to pad |
| 398 | * |
| 399 | * An Ethernet frame should have a minimum size of 60 bytes. This function |
| 400 | * takes short frames and pads them with zeros up to the 60 byte limit. |
| 401 | */ |
| 402 | static inline int eth_skb_pad(struct sk_buff *skb) |
| 403 | { |
| 404 | return skb_put_padto(skb, ETH_ZLEN); |
| 405 | } |
| 406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | #endif /* _LINUX_ETHERDEVICE_H */ |