55 u_int32_t	checksum(unsigned char *, unsigned, u_int32_t);
59 checksum(unsigned char *buf, unsigned nbytes, u_int32_t sum)  in checksum()  function
63 	/* Checksum all the pairs of bytes first... */  in checksum()
71 	 * If there's a single byte left over, checksum it, too.  in checksum()
129 	ip.ip_sum = wrapsum(checksum((unsigned char *)&ip, sizeof(ip), 0));  in assemble_udp_ip_header()
138 	udp.uh_sum = wrapsum(checksum((unsigned char *)&udp, sizeof(udp),  in assemble_udp_ip_header()
139 	    checksum(data, len, checksum((unsigned char *)&ip.ip_src,  in assemble_udp_ip_header()
181 	/* Check the IP header checksum - it should be zero. */  in decode_udp_ip_header()
183 	if (wrapsum(checksum(buf + bufix, ip_len, 0)) != 0) {  in decode_udp_ip_header()
202 	 * UDP header and the data.   If the UDP checksum field is zero,  in decode_udp_ip_header()
203 	 * we're not supposed to do a checksum.  in decode_udp_ip_header()
229 	sum = wrapsum(checksum((unsigned char *)udp, sizeof(*udp),  in decode_udp_ip_header()
230 	    checksum(data, len, checksum((unsigned char *)&ip->ip_src,  in decode_udp_ip_header()