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include/asm-alpha/checksum.h
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#ifndef _ALPHA_CHECKSUM_H #define _ALPHA_CHECKSUM_H #include <linux/in6.h> /* * This is a version of ip_compute_csum() optimized for IP headers, * which always checksum on 4 octet boundaries. */ |
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extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
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/* * computes the checksum of the TCP/UDP pseudo-header * returns a 16-bit checksum, already complemented */ |
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extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
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unsigned short len, unsigned short proto, |
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__wsum sum); |
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__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
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unsigned short len, unsigned short proto, |
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__wsum sum); |
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/* * 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 */ |
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extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
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/* * 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 */ |
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__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp); |
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__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum); |
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/* * this routine is used for miscellaneous IP-like checksums, mainly * in icmp.c */ |
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extern __sum16 ip_compute_csum(const void *buff, int len); |
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/* * Fold a partial checksum without adding pseudo headers */ |
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static inline __sum16 csum_fold(__wsum csum) |
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{ |
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u32 sum = (__force u32)csum; |
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sum = (sum & 0xffff) + (sum >> 16); sum = (sum & 0xffff) + (sum >> 16); |
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return (__force __sum16)~sum; |
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} #define _HAVE_ARCH_IPV6_CSUM |
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extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, __u32 len, unsigned short proto, __wsum sum); |
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#endif |