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1275 |
phoenix |
#ifndef _ALPHA_CHECKSUM_H
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#define _ALPHA_CHECKSUM_H
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/*
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* This is a version of ip_compute_csum() optimized for IP headers,
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* which always checksum on 4 octet boundaries.
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*/
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extern unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
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/*
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* computes the checksum of the TCP/UDP pseudo-header
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* returns a 16-bit checksum, already complemented
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*/
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extern unsigned short int csum_tcpudp_magic(unsigned long saddr,
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unsigned long daddr,
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unsigned short len,
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unsigned short proto,
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unsigned int sum);
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unsigned int csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
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unsigned short len, unsigned short proto,
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unsigned int sum);
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/*
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* computes the checksum of a memory block at buff, length len,
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* and adds in "sum" (32-bit)
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*
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* returns a 32-bit number suitable for feeding into itself
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* or csum_tcpudp_magic
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*
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* this function must be called with even lengths, except
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* for the last fragment, which may be odd
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*
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* it's best to have buff aligned on a 32-bit boundary
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*/
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extern unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
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/*
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* the same as csum_partial, but copies from src while it
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* checksums
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*
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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*/
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unsigned int csum_partial_copy(const char *src, char *dst, int len, unsigned int sum);
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/*
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* the same as csum_partial, but copies from user space (but on the alpha
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* we have just one address space, so this is identical to the above)
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*
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* this is obsolete and will go away.
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*/
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#define csum_partial_copy_fromuser csum_partial_copy
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/*
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* this is a new version of the above that records errors it finds in *errp,
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* but continues and zeros the rest of the buffer.
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*/
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unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len, unsigned int sum, int *errp);
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unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len, unsigned int sum);
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/*
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* this routine is used for miscellaneous IP-like checksums, mainly
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* in icmp.c
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*/
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extern unsigned short ip_compute_csum(unsigned char * buff, int len);
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/*
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* Fold a partial checksum without adding pseudo headers
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*/
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static inline unsigned short csum_fold(unsigned int sum)
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{
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sum = (sum & 0xffff) + (sum >> 16);
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sum = (sum & 0xffff) + (sum >> 16);
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return ~sum;
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}
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#define _HAVE_ARCH_IPV6_CSUM
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extern unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
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struct in6_addr *daddr,
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__u32 len,
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unsigned short proto,
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unsigned int sum);
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#endif
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