fin_optmsk
((fin->fin_optmsk & ip6exthdr[i].ol_bit) != 0))
fin->fin_optmsk |= ip6exthdr[i].ol_bit;
fin->fin_optmsk |= ip6exthdr[i].ol_bit;
fin->fin_optmsk |= ip6exthdr[i].ol_bit;
is->is_opt[0] = fin->fin_optmsk;
((fin->fin_optmsk & is->is_optmsk[rev]) != is->is_opt[rev]) ||
((fin->fin_optmsk & is->is_optmsk[rev]) != is->is_opt[rev]),
is->is_opt[1] = fin->fin_optmsk;