126a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann#ifndef __ASM_GENERIC_CHECKSUM_H 226a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann#define __ASM_GENERIC_CHECKSUM_H 326a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann 426a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann/* 526a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * computes the checksum of a memory block at buff, length len, 626a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * and adds in "sum" (32-bit) 726a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * 826a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * returns a 32-bit number suitable for feeding into itself 926a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * or csum_tcpudp_magic 1026a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * 1126a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * this function must be called with even lengths, except 1226a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * for the last fragment, which may be odd 1326a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * 1426a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * it's best to have buff aligned on a 32-bit boundary 1526a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann */ 1626a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmannextern __wsum csum_partial(const void *buff, int len, __wsum sum); 1726a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann 1826a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann/* 1926a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * the same as csum_partial, but copies from src while it 2026a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * checksums 2126a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * 2226a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * here even more important to align src and dst on a 32-bit (or even 2326a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * better 64-bit) boundary 2426a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann */ 2526a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmannextern __wsum csum_partial_copy(const void *src, void *dst, int len, __wsum sum); 2626a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann 2726a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann/* 2826a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * the same as csum_partial_copy, but copies from user space. 2926a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * 3026a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * here even more important to align src and dst on a 32-bit (or even 3126a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * better 64-bit) boundary 3226a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann */ 3326a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmannextern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, 3426a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann int len, __wsum sum, int *csum_err); 3526a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann 364e29198e1cd7728c30c96a8483a6068c71b34e4eLinas Vepstas#ifndef csum_partial_copy_nocheck 3726a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann#define csum_partial_copy_nocheck(src, dst, len, sum) \ 3826a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann csum_partial_copy((src), (dst), (len), (sum)) 394e29198e1cd7728c30c96a8483a6068c71b34e4eLinas Vepstas#endif 4026a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann 4164e69073c35439fa19c2ad2a4a18834e0314f071Vineet Gupta#ifndef ip_fast_csum 4226a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann/* 4326a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * This is a version of ip_compute_csum() optimized for IP headers, 4426a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * which always checksum on 4 octet boundaries. 4526a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann */ 4626a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmannextern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); 4764e69073c35439fa19c2ad2a4a18834e0314f071Vineet Gupta#endif 4826a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann 4964e69073c35439fa19c2ad2a4a18834e0314f071Vineet Gupta#ifndef csum_fold 5026a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann/* 5126a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * Fold a partial checksum 5226a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann */ 5326a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmannstatic inline __sum16 csum_fold(__wsum csum) 5426a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann{ 5526a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann u32 sum = (__force u32)csum; 5626a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann sum = (sum & 0xffff) + (sum >> 16); 5726a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann sum = (sum & 0xffff) + (sum >> 16); 5826a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann return (__force __sum16)~sum; 5926a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann} 6064e69073c35439fa19c2ad2a4a18834e0314f071Vineet Gupta#endif 6126a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann 6226a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann#ifndef csum_tcpudp_nofold 6326a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann/* 6426a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * computes the checksum of the TCP/UDP pseudo-header 6526a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * returns a 16-bit checksum, already complemented 6626a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann */ 6726a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmannextern __wsum 6826a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmanncsum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, 6926a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann unsigned short proto, __wsum sum); 7026a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann#endif 7126a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann 724e29198e1cd7728c30c96a8483a6068c71b34e4eLinas Vepstas#ifndef csum_tcpudp_magic 7326a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmannstatic inline __sum16 7426a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmanncsum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, 7526a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann unsigned short proto, __wsum sum) 7626a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann{ 7726a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); 7826a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann} 794e29198e1cd7728c30c96a8483a6068c71b34e4eLinas Vepstas#endif 8026a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann 8126a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann/* 8226a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * this routine is used for miscellaneous IP-like checksums, mainly 8326a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann * in icmp.c 8426a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann */ 8526a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmannextern __sum16 ip_compute_csum(const void *buff, int len); 8626a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann 8726a28fa4fea5b8c65713aa50c124f76a88c7924dArnd Bergmann#endif /* __ASM_GENERIC_CHECKSUM_H */ 88