in_cksum.h File Reference

#include <sys/cdefs.h>
#include <netinet/ip.h>

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Macros
#define	in_cksum_update(ip)

Functions
u_int	in_cksum_hdr (const struct ip *)

Macro Definition Documentation

in_cksum_update

#define in_cksum_update

(

ip

)

Value:

do { \
                int __tmpsum; \
                __tmpsum = (int)ntohs(ip->ip_sum) + 256; \
                ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \
        } while(0)