IPV6_FW_F_OIFNAME
rule.fw_flg |= IPV6_FW_F_OIFNAME;
(IPV6_FW_F_IIFNAME | IPV6_FW_F_OIFNAME);
chain->fw_flg & IPV6_FW_F_OIFNAME);
&f->fw_in_if, f->fw_flg & IPV6_FW_F_OIFNAME))
&f->fw_out_if, f->fw_flg & IPV6_FW_F_OIFNAME)))
|| ((frwl->fw_flg & IPV6_FW_F_OIFNAME)