1 /* $Id: cksum.c,v 1.3 2004/04/14 12:30:18 antirez Exp $ */
3 #include "hping2.h" /* only for arch semi-indipendent data types */
7 * from R. Stevens's Network Programming
9 __u16 cksum(__u16 *buf, int nbytes)
22 *((__u16 *) &oddbyte) = *(__u16 *) buf;
26 sum = (sum >> 16) + (sum & 0xffff);
29 /* return a bad checksum with --badcksum option */
30 if (opt_badcksum) sum ^= 0x5555;