| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. NET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * Definitions for the Ethernet handlers. |
| * |
| * Version: @(#)eth.h 1.0.4 05/13/93 |
| * |
| * Authors: Ross Biro |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * |
| * Relocated to include/linux where it belongs by Alan Cox |
| * <gw4pts@gw4pts.ampr.org> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| */ |
| #ifndef _LINUX_ETHERDEVICE_H |
| #define _LINUX_ETHERDEVICE_H |
| |
| #include <linux/if_ether.h> |
| #include <linux/netdevice.h> |
| #include <linux/random.h> |
| #include <asm/unaligned.h> |
| #include <asm/bitsperlong.h> |
| |
| #ifdef __KERNEL__ |
| __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev); |
| extern const struct header_ops eth_header_ops; |
| |
| int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, |
| const void *daddr, const void *saddr, unsigned len); |
| int eth_rebuild_header(struct sk_buff *skb); |
| int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr); |
| int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, |
| __be16 type); |
| void eth_header_cache_update(struct hh_cache *hh, const struct net_device *dev, |
| const unsigned char *haddr); |
| int eth_prepare_mac_addr_change(struct net_device *dev, void *p); |
| void eth_commit_mac_addr_change(struct net_device *dev, void *p); |
| int eth_mac_addr(struct net_device *dev, void *p); |
| int eth_change_mtu(struct net_device *dev, int new_mtu); |
| int eth_validate_addr(struct net_device *dev); |
| |
| struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, |
| unsigned int rxqs); |
| #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1) |
| #define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count) |
| |
| /* Reserved Ethernet Addresses per IEEE 802.1Q */ |
| static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) = |
| { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; |
| |
| /** |
| * is_link_local_ether_addr - Determine if given Ethernet address is link-local |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Return true if address is link local reserved addr (01:80:c2:00:00:0X) per |
| * IEEE 802.1Q 8.6.3 Frame filtering. |
| * |
| * Please note: addr must be aligned to u16. |
| */ |
| static inline bool is_link_local_ether_addr(const u8 *addr) |
| { |
| __be16 *a = (__be16 *)addr; |
| static const __be16 *b = (const __be16 *)eth_reserved_addr_base; |
| static const __be16 m = cpu_to_be16(0xfff0); |
| |
| #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
| return (((*(const u32 *)addr) ^ (*(const u32 *)b)) | |
| ((a[2] ^ b[2]) & m)) == 0; |
| #else |
| return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0; |
| #endif |
| } |
| |
| /** |
| * is_zero_ether_addr - Determine if give Ethernet address is all zeros. |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Return true if the address is all zeroes. |
| * |
| * Please note: addr must be aligned to u16. |
| */ |
| static inline bool is_zero_ether_addr(const u8 *addr) |
| { |
| #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
| return ((*(const u32 *)addr) | (*(const u16 *)(addr + 4))) == 0; |
| #else |
| return (*(const u16 *)(addr + 0) | |
| *(const u16 *)(addr + 2) | |
| *(const u16 *)(addr + 4)) == 0; |
| #endif |
| } |
| |
| /** |
| * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Return true if the address is a multicast address. |
| * By definition the broadcast address is also a multicast address. |
| */ |
| static inline bool is_multicast_ether_addr(const u8 *addr) |
| { |
| return 0x01 & addr[0]; |
| } |
| |
| /** |
| * is_local_ether_addr - Determine if the Ethernet address is locally-assigned one (IEEE 802). |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Return true if the address is a local address. |
| */ |
| static inline bool is_local_ether_addr(const u8 *addr) |
| { |
| return 0x02 & addr[0]; |
| } |
| |
| /** |
| * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Return true if the address is the broadcast address. |
| * |
| * Please note: addr must be aligned to u16. |
| */ |
| static inline bool is_broadcast_ether_addr(const u8 *addr) |
| { |
| return (*(const u16 *)(addr + 0) & |
| *(const u16 *)(addr + 2) & |
| *(const u16 *)(addr + 4)) == 0xffff; |
| } |
| |
| /** |
| * is_unicast_ether_addr - Determine if the Ethernet address is unicast |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Return true if the address is a unicast address. |
| */ |
| static inline bool is_unicast_ether_addr(const u8 *addr) |
| { |
| return !is_multicast_ether_addr(addr); |
| } |
| |
| /** |
| * is_valid_ether_addr - Determine if the given Ethernet address is valid |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not |
| * a multicast address, and is not FF:FF:FF:FF:FF:FF. |
| * |
| * Return true if the address is valid. |
| * |
| * Please note: addr must be aligned to u16. |
| */ |
| static inline bool is_valid_ether_addr(const u8 *addr) |
| { |
| /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to |
| * explicitly check for it here. */ |
| return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); |
| } |
| |
| /** |
| * eth_random_addr - Generate software assigned random Ethernet address |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Generate a random Ethernet address (MAC) that is not multicast |
| * and has the local assigned bit set. |
| */ |
| static inline void eth_random_addr(u8 *addr) |
| { |
| get_random_bytes(addr, ETH_ALEN); |
| addr[0] &= 0xfe; /* clear multicast bit */ |
| addr[0] |= 0x02; /* set local assignment bit (IEEE802) */ |
| } |
| |
| #define random_ether_addr(addr) eth_random_addr(addr) |
| |
| /** |
| * eth_broadcast_addr - Assign broadcast address |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Assign the broadcast address to the given address array. |
| */ |
| static inline void eth_broadcast_addr(u8 *addr) |
| { |
| memset(addr, 0xff, ETH_ALEN); |
| } |
| |
| /** |
| * eth_zero_addr - Assign zero address |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Assign the zero address to the given address array. |
| */ |
| static inline void eth_zero_addr(u8 *addr) |
| { |
| memset(addr, 0x00, ETH_ALEN); |
| } |
| |
| /** |
| * eth_hw_addr_random - Generate software assigned random Ethernet and |
| * set device flag |
| * @dev: pointer to net_device structure |
| * |
| * Generate a random Ethernet address (MAC) to be used by a net device |
| * and set addr_assign_type so the state can be read by sysfs and be |
| * used by userspace. |
| */ |
| static inline void eth_hw_addr_random(struct net_device *dev) |
| { |
| dev->addr_assign_type = NET_ADDR_RANDOM; |
| eth_random_addr(dev->dev_addr); |
| } |
| |
| /** |
| * eth_hw_addr_inherit - Copy dev_addr from another net_device |
| * @dst: pointer to net_device to copy dev_addr to |
| * @src: pointer to net_device to copy dev_addr from |
| * |
| * Copy the Ethernet address from one net_device to another along with |
| * the address attributes (addr_assign_type). |
| */ |
| static inline void eth_hw_addr_inherit(struct net_device *dst, |
| struct net_device *src) |
| { |
| dst->addr_assign_type = src->addr_assign_type; |
| memcpy(dst->dev_addr, src->dev_addr, ETH_ALEN); |
| } |
| |
| /** |
| * ether_addr_equal - Compare two Ethernet addresses |
| * @addr1: Pointer to a six-byte array containing the Ethernet address |
| * @addr2: Pointer other six-byte array containing the Ethernet address |
| * |
| * Compare two Ethernet addresses, returns true if equal |
| * |
| * Please note: addr1 & addr2 must both be aligned to u16. |
| */ |
| static inline bool ether_addr_equal(const u8 *addr1, const u8 *addr2) |
| { |
| #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
| u32 fold = ((*(const u32 *)addr1) ^ (*(const u32 *)addr2)) | |
| ((*(const u16 *)(addr1 + 4)) ^ (*(const u16 *)(addr2 + 4))); |
| |
| return fold == 0; |
| #else |
| const u16 *a = (const u16 *)addr1; |
| const u16 *b = (const u16 *)addr2; |
| |
| return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) == 0; |
| #endif |
| } |
| |
| /** |
| * ether_addr_equal_64bits - Compare two Ethernet addresses |
| * @addr1: Pointer to an array of 8 bytes |
| * @addr2: Pointer to an other array of 8 bytes |
| * |
| * Compare two Ethernet addresses, returns true if equal, false otherwise. |
| * |
| * The function doesn't need any conditional branches and possibly uses |
| * word memory accesses on CPU allowing cheap unaligned memory reads. |
| * arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 } |
| * |
| * Please note that alignment of addr1 & addr2 are only guaranteed to be 16 bits. |
| */ |
| |
| static inline bool ether_addr_equal_64bits(const u8 addr1[6+2], |
| const u8 addr2[6+2]) |
| { |
| #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| u64 fold = (*(const u64 *)addr1) ^ (*(const u64 *)addr2); |
| |
| #ifdef __BIG_ENDIAN |
| return (fold >> 16) == 0; |
| #else |
| return (fold << 16) == 0; |
| #endif |
| #else |
| return ether_addr_equal(addr1, addr2); |
| #endif |
| } |
| |
| /** |
| * ether_addr_equal_unaligned - Compare two not u16 aligned Ethernet addresses |
| * @addr1: Pointer to a six-byte array containing the Ethernet address |
| * @addr2: Pointer other six-byte array containing the Ethernet address |
| * |
| * Compare two Ethernet addresses, returns true if equal |
| * |
| * Please note: Use only when any Ethernet address may not be u16 aligned. |
| */ |
| static inline bool ether_addr_equal_unaligned(const u8 *addr1, const u8 *addr2) |
| { |
| #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
| return ether_addr_equal(addr1, addr2); |
| #else |
| return memcmp(addr1, addr2, ETH_ALEN) == 0; |
| #endif |
| } |
| |
| /** |
| * is_etherdev_addr - Tell if given Ethernet address belongs to the device. |
| * @dev: Pointer to a device structure |
| * @addr: Pointer to a six-byte array containing the Ethernet address |
| * |
| * Compare passed address with all addresses of the device. Return true if the |
| * address if one of the device addresses. |
| * |
| * Note that this function calls ether_addr_equal_64bits() so take care of |
| * the right padding. |
| */ |
| static inline bool is_etherdev_addr(const struct net_device *dev, |
| const u8 addr[6 + 2]) |
| { |
| struct netdev_hw_addr *ha; |
| bool res = false; |
| |
| rcu_read_lock(); |
| for_each_dev_addr(dev, ha) { |
| res = ether_addr_equal_64bits(addr, ha->addr); |
| if (res) |
| break; |
| } |
| rcu_read_unlock(); |
| return res; |
| } |
| #endif /* __KERNEL__ */ |
| |
| /** |
| * compare_ether_header - Compare two Ethernet headers |
| * @a: Pointer to Ethernet header |
| * @b: Pointer to Ethernet header |
| * |
| * Compare two Ethernet headers, returns 0 if equal. |
| * This assumes that the network header (i.e., IP header) is 4-byte |
| * aligned OR the platform can handle unaligned access. This is the |
| * case for all packets coming into netif_receive_skb or similar |
| * entry points. |
| */ |
| |
| static inline unsigned long compare_ether_header(const void *a, const void *b) |
| { |
| #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| unsigned long fold; |
| |
| /* |
| * We want to compare 14 bytes: |
| * [a0 ... a13] ^ [b0 ... b13] |
| * Use two long XOR, ORed together, with an overlap of two bytes. |
| * [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] | |
| * [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13] |
| * This means the [a6 a7] ^ [b6 b7] part is done two times. |
| */ |
| fold = *(unsigned long *)a ^ *(unsigned long *)b; |
| fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6); |
| return fold; |
| #else |
| u32 *a32 = (u32 *)((u8 *)a + 2); |
| u32 *b32 = (u32 *)((u8 *)b + 2); |
| |
| return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) | |
| (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]); |
| #endif |
| } |
| |
| #endif /* _LINUX_ETHERDEVICE_H */ |