taglinefilesource code
IP_FW_F_MASQ446net/ipv4/ip_fw.cif(f->fw_flg&IP_FW_F_MASQ)
IP_FW_F_MASQ510net/ipv4/ip_fw.canswer=(policy&IP_FW_F_MASQ)?FW_MASQUERADE:FW_ACCEPT;