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#ifndef _ALPHA_CHECKSUM_H
#define _ALPHA_CHECKSUM_H
/*
* This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries.
*/
extern unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
/*
* computes the checksum of the TCP/UDP pseudo-header
* returns a 16-bit checksum, already complemented
*/
extern unsigned short int csum_tcpudp_magic(unsigned long saddr,
unsigned long daddr,
unsigned short len,
unsigned short proto,
unsigned int sum);
unsigned int csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
unsigned short len, unsigned short proto,
unsigned int sum);
/*
* computes the checksum of a memory block at buff, length len,
* and adds in "sum" (32-bit)
*
* returns a 32-bit number suitable for feeding into itself
* or csum_tcpudp_magic
*
* this function must be called with even lengths, except
* for the last fragment, which may be odd
*
* it's best to have buff aligned on a 32-bit boundary
*/
extern unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
/*
* the same as csum_partial, but copies from src while it
* checksums
*
* here even more important to align src and dst on a 32-bit (or even
* better 64-bit) boundary
*/
unsigned int csum_partial_copy(const char *src, char *dst, int len, unsigned int sum);
/*
* the same as csum_partial, but copies from user space (but on the alpha
* we have just one address space, so this is identical to the above)
*
* this is obsolete and will go away.
*/
#define csum_partial_copy_fromuser csum_partial_copy
/*
* this is a new version of the above that records errors it finds in *errp,
* but continues and zeros the rest of the buffer.
*/
unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len, unsigned int sum, int *errp);
unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len, unsigned int sum);
/*
* this routine is used for miscellaneous IP-like checksums, mainly
* in icmp.c
*/
extern unsigned short ip_compute_csum(unsigned char * buff, int len);
/*
* Fold a partial checksum without adding pseudo headers
*/
static inline unsigned short csum_fold(unsigned int sum)
{
sum = (sum & 0xffff) + (sum >> 16);
sum = (sum & 0xffff) + (sum >> 16);
return ~sum;
}
#define _HAVE_ARCH_IPV6_CSUM
extern unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
struct in6_addr *daddr,
__u32 len,
unsigned short proto,
unsigned int sum);
#endif
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