checksum.h File Reference

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Macros
#define	csum_partial_copy_nocheck(src, dst, len, sum)   csum_partial_copy((src), (dst), (len), (sum))

Functions
__wsum	csum_partial (const void *buff, int len, __wsum sum)
__wsum	csum_partial_copy (const void *src, void *dst, int len, __wsum sum)
__wsum	csum_partial_copy_from_user (const void __user *src, void *dst, int len, __wsum sum, int *csum_err)
__sum16	ip_fast_csum (const void *iph, unsigned int ihl)
__wsum	csum_tcpudp_nofold (__be32 saddr, __be32 daddr, unsigned short len, unsigned short proto, __wsum sum)
__sum16	ip_compute_csum (const void *buff, int len)

Macro Definition Documentation

#define csum_partial_copy_nocheck	(		src,
			dst,
			len,
			sum
	)		csum_partial_copy((src), (dst), (len), (sum))

Definition at line 37 of file checksum.h.

Function Documentation

__wsum csum_partial	(	const void *	buff,
		int	len,
		__wsum	sum
	)

csum_partial - Compute an internet checksum. : buffer to be checksummed : length of buffer. : initial sum to be added in (32bit unfolded)

Returns the 32bit unfolded internet checksum of the buffer. Before filling it in it needs to be csum_fold()'ed. buff should be aligned to a 64bit boundary if possible.

Definition at line 164 of file checksum.c.

__wsum csum_partial_copy	(	const void *	src,
		void *	dst,
		int	len,
		__wsum	sum
	)

Definition at line 54 of file checksum.c.

__wsum csum_partial_copy_from_user	(	const void __user *	src,
		void *	dst,
		int	len,
		__wsum	sum,
		int *	csum_err
	)

csum_partial_copy_from_user - Copy and checksum from user space. : source address (user space) : destination address : number of bytes to be copied. : initial sum that is added into the result (32bit unfolded) : set to -EFAULT for an bad source address.

Returns an 32bit unfolded checksum of the buffer. src and dst are best aligned to 64bits.

Definition at line 333 of file csum_partial_copy.c.

__wsum csum_tcpudp_nofold	(	__be32	saddr,
		__be32	daddr,
		unsigned short	len,
		unsigned short	proto,
		__wsum	sum
	)

Definition at line 54 of file checksum.c.

__sum16 ip_compute_csum	(	const void *	buff,
		int	len
	)

ip_compute_csum - Compute an 16bit IP checksum. : buffer address. : length of buffer.

Returns the 16bit folded/inverted checksum of the passed buffer. Ready to fill in.

Definition at line 181 of file checksum.c.

__sum16 ip_fast_csum	(	const void *	iph,
		unsigned int	ihl
	)

Definition at line 147 of file checksum.c.