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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [include/] [asm-or32/] [checksum.h] - Rev 901
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#ifndef _OR32_CHECKSUM_H #define _OR32_CHECKSUM_H #include <linux/config.h> /* * 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 */ unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum); /* * the same as csum_partial_copy, 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, int sum); /* * the same as csum_partial_copy, but copies from user space. * * here even more important to align src and dst on a 32-bit (or even * better 64-bit) boundary */ unsigned int csum_partial_copy_fromuser(const char *src, char *dst, int len, int sum); unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl); /* * 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; } /* * computes the checksum of the TCP/UDP pseudo-header * returns a 16-bit checksum, already complemented */ static inline unsigned short int csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len, unsigned short proto, unsigned int sum) { unsigned long result = saddr; result += daddr; result += (daddr > result); result += len; result += (len > result); result += proto; result += (proto > result); result += sum; result += (sum > result); result = (result >> 16) + (result & 0xffff); result = (result >> 16) + (result & 0xffff); return ~result; } extern unsigned short ip_compute_csum(const unsigned char * buff, int len); #endif /* _OR32_CHECKSUM_H */
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