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Date: Fri, 23 Nov 2007 00:09:22 +0000 (GMT) From: Daniel Drake <dsd@...too.org> To: davem@...emloft.net Cc: netdev@...r.kernel.org Subject: [PATCH] add compare_ether_addr_unaligned David Miller found a problem in a wireless driver where I was using compare_ether_addr() on potentially unaligned data. Document that compare_ether_addr() is not safe for use everywhere, and add an equivalent function that works regardless of alignment. Signed-off-by: Daniel Drake <dsd@...too.org> Index: linux-2.6.24-rc3-git1/include/linux/etherdevice.h =================================================================== --- linux-2.6.24-rc3-git1.orig/include/linux/etherdevice.h +++ linux-2.6.24-rc3-git1/include/linux/etherdevice.h @@ -123,11 +123,13 @@ static inline void random_ether_addr(u8 } /** - * compare_ether_addr - Compare two Ethernet addresses + * compare_ether_addr - Compare two 16-bit-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 0 if equal + * Compare two ethernet addresses, returns 0 if equal. Both addresses must + * be 16-bit aligned. For unaligned or potentially unaligned address + * comparisons, use compare_ether_addr_unaligned() instead. */ static inline unsigned compare_ether_addr(const u8 *addr1, const u8 *addr2) { @@ -137,6 +139,21 @@ static inline unsigned compare_ether_add BUILD_BUG_ON(ETH_ALEN != 6); return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0; } + +/** + * compare_ether_addr_unaligned - 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 0 if equal. compare_ether_addr() + * is faster than this function, but unless you can ensure alignment you + * must use this function instead. + */ +static inline unsigned compare_ether_addr_unaligned(const u8 *addr1, + const u8 *addr2) +{ + return memcmp(addr1, addr2, ETH_ALEN); +} #endif /* __KERNEL__ */ #endif /* _LINUX_ETHERDEVICE_H */ - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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