                        = 0x00  IPV0_RTHDRDSTOPTS                 = 0x00  IPV0_RTHDR_LOOSE                  = 0x0  IPV0_RTHDR_STRICT                 = 0x0  IPV0_RTHDR_TYPE_0                 = 0x0  IPV0_SOCKOPT_RESERVED0            = 0x0  IPV0_TCLASS                       = 0x0