ipsec_tx_ft_create
ft = ipsec_tx_ft_create(tx->ns, 0, 0, 4);
ft = ipsec_tx_ft_create(tx->ns, 2, 0, 4);
ft = ipsec_tx_ft_create(tx->ns, 1, 0, 2);
ft = ipsec_tx_ft_create(tx->ns, 2, 0, 1);