1455 	struct icmp *const icmpheader = (struct icmp *) outp;  in icmp_prep()  local
1457 	icmpheader->icmp_type = ICMP_ECHO;  in icmp_prep()
1458 	icmpheader->icmp_id = htons(ident);  in icmp_prep()
1459 	icmpheader->icmp_seq = htons(outdata->seq);  in icmp_prep()
1460 	icmpheader->icmp_cksum = 0;  in icmp_prep()
1461 	icmpheader->icmp_cksum = in_cksum((u_short *)icmpheader, protlen);  in icmp_prep()
1462 	if (icmpheader->icmp_cksum == 0)  in icmp_prep()
1463 		icmpheader->icmp_cksum = 0xffff;  in icmp_prep()
1469 	struct icmp *const icmpheader = (struct icmp *) data;  in icmp_check()  local
1471 	return (icmpheader->icmp_id == htons(ident)  in icmp_check()
1472 	    && icmpheader->icmp_seq == htons(seq));  in icmp_check()