fix_incksum
fix_incksum(&icmp->icmp_cksum, sumd2);
fix_incksum(&fin->fin_ip->ip_sum,
fix_incksum(csump, sumd);
fix_incksum(&fin->fin_ip->ip_sum, nat->nat_ipsumd);
fix_incksum(csump, nat->nat_sumd[0]);
fix_incksum(csump, nat->nat_sumd[1]);
fix_incksum(&icmp6->icmp6_cksum, sumd1);
fix_incksum(csump, nat->nat_sumd[1]);
fix_incksum(csump, nat->nat_sumd[0]);
fix_incksum(csump, nat->nat_sumd[0]);
fix_incksum(csump, nat->nat_sumd[1]);
fix_incksum(csump, sd);
fix_incksum(&tcp->th_sum, is->is_sumd[0]);
fix_incksum(&tcp->th_sum, is->is_sumd[1]);
extern void fix_incksum __P((u_short *, u_32_t));