15 	int sum, oddbyte;  in compute_ip_checksum()  local
18 	sum = 0;  in compute_ip_checksum()
20 		sum += *ptr++;  in compute_ip_checksum()
27 		sum += oddbyte;  in compute_ip_checksum()
29 	sum = (sum >> 16) + (sum & 0xffff);  in compute_ip_checksum()
30 	sum += (sum >> 16);  in compute_ip_checksum()
31 	sum = ~sum & 0xffff;  in compute_ip_checksum()
33 	return sum;  in compute_ip_checksum()
36 unsigned add_ip_checksums(unsigned offset, unsigned sum, unsigned new)  in add_ip_checksums()  argument
40 	sum = ~sum & 0xffff;  in add_ip_checksums()
49 	checksum = sum + new;  in add_ip_checksums()