1#ifndef __ASM_SH64_CHECKSUM_H 2#define __ASM_SH64_CHECKSUM_H 3 4/* 5 * This file is subject to the terms and conditions of the GNU General Public 6 * License. See the file "COPYING" in the main directory of this archive 7 * for more details. 8 * 9 * include/asm-sh64/checksum.h 10 * 11 * Copyright (C) 2000, 2001 Paolo Alberelli 12 * 13 */ 14 15#include <asm/registers.h> 16 17/* 18 * computes the checksum of a memory block at buff, length len, 19 * and adds in "sum" (32-bit) 20 * 21 * returns a 32-bit number suitable for feeding into itself 22 * or csum_tcpudp_magic 23 * 24 * this function must be called with even lengths, except 25 * for the last fragment, which may be odd 26 * 27 * it's best to have buff aligned on a 32-bit boundary 28 */ 29asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum); 30 31/* 32 * Note: when you get a NULL pointer exception here this means someone 33 * passed in an incorrect kernel address to one of these functions. 34 * 35 * If you use these functions directly please don't forget the 36 * access_ok(). 37 */ 38 39 40__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, 41 __wsum sum); 42 43__wsum csum_partial_copy_from_user(const void __user *src, void *dst, 44 int len, __wsum sum, int *err_ptr); 45 46static inline __sum16 csum_fold(__wsum csum) 47{ 48 u32 sum = (__force u32)csum; 49 sum = (sum & 0xffff) + (sum >> 16); 50 sum = (sum & 0xffff) + (sum >> 16); 51 return (__force __sum16)~sum; 52} 53 54__sum16 ip_fast_csum(const void *iph, unsigned int ihl); 55 56__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, 57 unsigned short len, unsigned short proto, 58 __wsum sum); 59 60/* 61 * computes the checksum of the TCP/UDP pseudo-header 62 * returns a 16-bit checksum, already complemented 63 */ 64static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, 65 unsigned short len, 66 unsigned short proto, 67 __wsum sum) 68{ 69 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); 70} 71 72/* 73 * this routine is used for miscellaneous IP-like checksums, mainly 74 * in icmp.c 75 */ 76static inline __sum16 ip_compute_csum(const void *buff, int len) 77{ 78 return csum_fold(csum_partial(buff, len, 0)); 79} 80 81#endif /* __ASM_SH64_CHECKSUM_H */ 82