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

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  1 #ifndef _ALPHA_CHECKSUM_H
  2 #define _ALPHA_CHECKSUM_H
  3 
  4 #include <linux/in6.h>
  5 
  6 /*
  7  *      This is a version of ip_compute_csum() optimized for IP headers,
  8  *      which always checksum on 4 octet boundaries.
  9  */
 10 extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
 11 
 12 /*
 13  * computes the checksum of the TCP/UDP pseudo-header
 14  * returns a 16-bit checksum, already complemented
 15  */
 16 __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
 17                           __u32 len, __u8 proto, __wsum sum);
 18 
 19 __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 20                           __u32 len, __u8 proto, __wsum sum);
 21 
 22 /*
 23  * computes the checksum of a memory block at buff, length len,
 24  * and adds in "sum" (32-bit)
 25  *
 26  * returns a 32-bit number suitable for feeding into itself
 27  * or csum_tcpudp_magic
 28  *
 29  * this function must be called with even lengths, except
 30  * for the last fragment, which may be odd
 31  *
 32  * it's best to have buff aligned on a 32-bit boundary
 33  */
 34 extern __wsum csum_partial(const void *buff, int len, __wsum sum);
 35 
 36 /*
 37  * the same as csum_partial, but copies from src while it
 38  * checksums
 39  *
 40  * here even more important to align src and dst on a 32-bit (or even
 41  * better 64-bit) boundary
 42  */
 43 __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp);
 44 
 45 __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
 46 
 47 
 48 /*
 49  * this routine is used for miscellaneous IP-like checksums, mainly
 50  * in icmp.c
 51  */
 52 
 53 extern __sum16 ip_compute_csum(const void *buff, int len);
 54 
 55 /*
 56  *      Fold a partial checksum without adding pseudo headers
 57  */
 58 
 59 static inline __sum16 csum_fold(__wsum csum)
 60 {
 61         u32 sum = (__force u32)csum;
 62         sum = (sum & 0xffff) + (sum >> 16);
 63         sum = (sum & 0xffff) + (sum >> 16);
 64         return (__force __sum16)~sum;
 65 }
 66 
 67 #define _HAVE_ARCH_IPV6_CSUM
 68 extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
 69                                const struct in6_addr *daddr,
 70                                __u32 len, __u8 proto, __wsum sum);
 71 #endif
 72 

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