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#include <stdint.h>
struct sockaddr;
/* calculates the checksum of len bytes at buff when combined with wsum.
* return value is already in network order, but must be inverted before
* sending.
* example: hdr.th_sum = csum_partial(data, len, csum_partial(hdr, hdrlen, 0));
*/
uint16_t csum_partial(const void *buff, int len, uint16_t wsum);
/* calculates the checksum of a sockaddr_in or sockaddr_in6.
* if incl_port is set then the sin_port will be included.
* otherwise identical to csum_partial.
*/
uint16_t csum_sockaddr_partial(const struct sockaddr *addr, int incl_port, uint16_t wsum);
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