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Linux/arch/cris/include/asm/checksum.h

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  1 /* TODO: csum_tcpudp_magic could be speeded up, and csum_fold as well */
  2 
  3 #ifndef _CRIS_CHECKSUM_H
  4 #define _CRIS_CHECKSUM_H
  5 
  6 #include <arch/checksum.h>
  7 
  8 /*
  9  * computes the checksum of a memory block at buff, length len,
 10  * and adds in "sum" (32-bit)
 11  *
 12  * returns a 32-bit number suitable for feeding into itself
 13  * or csum_tcpudp_magic
 14  *
 15  * this function must be called with even lengths, except
 16  * for the last fragment, which may be odd
 17  *
 18  * it's best to have buff aligned on a 32-bit boundary
 19  */
 20 __wsum csum_partial(const void *buff, int len, __wsum sum);
 21 
 22 /*
 23  * the same as csum_partial, but copies from src while it
 24  * checksums
 25  *
 26  * here even more important to align src and dst on a 32-bit (or even
 27  * better 64-bit) boundary
 28  */
 29 
 30 __wsum csum_partial_copy_nocheck(const void *src, void *dst,
 31                                        int len, __wsum sum);
 32 
 33 /*
 34  *      Fold a partial checksum into a word
 35  */
 36 
 37 static inline __sum16 csum_fold(__wsum csum)
 38 {
 39         u32 sum = (__force u32)csum;
 40         sum = (sum & 0xffff) + (sum >> 16); /* add in end-around carry */
 41         sum = (sum & 0xffff) + (sum >> 16); /* add in end-around carry */
 42         return (__force __sum16)~sum;
 43 }
 44 
 45 extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
 46                                                 int len, __wsum sum,
 47                                                 int *errptr);
 48 
 49 /*
 50  *      This is a version of ip_compute_csum() optimized for IP headers,
 51  *      which always checksum on 4 octet boundaries.
 52  *
 53  */
 54 
 55 static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
 56 {
 57         return csum_fold(csum_partial(iph, ihl * 4, 0));
 58 }
 59  
 60 /*
 61  * computes the checksum of the TCP/UDP pseudo-header
 62  * returns a 16-bit checksum, already complemented
 63  */
 64 
 65 static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
 66                                         __u32 len, __u8 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  */
 76 
 77 static inline __sum16 ip_compute_csum(const void *buff, int len)
 78 {
 79         return csum_fold (csum_partial(buff, len, 0));
 80 }
 81 
 82 #endif
 83 

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