| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.util; |
| |
| /** |
| * Network constants used by the network stack. |
| */ |
| public final class NetworkStackConstants { |
| |
| /** |
| * IPv4 constants. |
| * |
| * See also: |
| * - https://tools.ietf.org/html/rfc791 |
| */ |
| public static final int IPV4_ADDR_BITS = 32; |
| public static final int IPV4_MIN_MTU = 68; |
| public static final int IPV4_MAX_MTU = 65_535; |
| |
| /** |
| * Ethernet constants. |
| * |
| * See also: |
| * - https://tools.ietf.org/html/rfc894 |
| * - https://tools.ietf.org/html/rfc2464 |
| * - https://tools.ietf.org/html/rfc7042 |
| * - http://www.iana.org/assignments/ethernet-numbers/ethernet-numbers.xhtml |
| * - http://www.iana.org/assignments/ieee-802-numbers/ieee-802-numbers.xhtml |
| */ |
| public static final int ETHER_DST_ADDR_OFFSET = 0; |
| public static final int ETHER_SRC_ADDR_OFFSET = 6; |
| public static final int ETHER_ADDR_LEN = 6; |
| public static final int ETHER_TYPE_OFFSET = 12; |
| public static final int ETHER_TYPE_LENGTH = 2; |
| public static final int ETHER_TYPE_ARP = 0x0806; |
| public static final int ETHER_TYPE_IPV4 = 0x0800; |
| public static final int ETHER_TYPE_IPV6 = 0x86dd; |
| public static final int ETHER_HEADER_LEN = 14; |
| |
| /** |
| * ARP constants. |
| * |
| * See also: |
| * - https://tools.ietf.org/html/rfc826 |
| * - http://www.iana.org/assignments/arp-parameters/arp-parameters.xhtml |
| */ |
| public static final int ARP_PAYLOAD_LEN = 28; // For Ethernet+IPv4. |
| public static final int ARP_REQUEST = 1; |
| public static final int ARP_REPLY = 2; |
| public static final int ARP_HWTYPE_RESERVED_LO = 0; |
| public static final int ARP_HWTYPE_ETHER = 1; |
| public static final int ARP_HWTYPE_RESERVED_HI = 0xffff; |
| |
| /** |
| * IPv4 constants. |
| * |
| * See also: |
| * - https://tools.ietf.org/html/rfc791 |
| */ |
| public static final int IPV4_HEADER_MIN_LEN = 20; |
| public static final int IPV4_IHL_MASK = 0xf; |
| public static final int IPV4_FLAGS_OFFSET = 6; |
| public static final int IPV4_FRAGMENT_MASK = 0x1fff; |
| public static final int IPV4_PROTOCOL_OFFSET = 9; |
| public static final int IPV4_SRC_ADDR_OFFSET = 12; |
| public static final int IPV4_DST_ADDR_OFFSET = 16; |
| public static final int IPV4_ADDR_LEN = 4; |
| |
| /** |
| * IPv6 constants. |
| * |
| * See also: |
| * - https://tools.ietf.org/html/rfc2460 |
| */ |
| public static final int IPV6_ADDR_LEN = 16; |
| public static final int IPV6_HEADER_LEN = 40; |
| public static final int IPV6_PROTOCOL_OFFSET = 6; |
| public static final int IPV6_SRC_ADDR_OFFSET = 8; |
| public static final int IPV6_DST_ADDR_OFFSET = 24; |
| |
| /** |
| * ICMPv6 constants. |
| * |
| * See also: |
| * - https://tools.ietf.org/html/rfc4443 |
| * - https://tools.ietf.org/html/rfc4861 |
| */ |
| public static final int ICMPV6_HEADER_MIN_LEN = 4; |
| public static final int ICMPV6_ECHO_REPLY_TYPE = 129; |
| public static final int ICMPV6_ECHO_REQUEST_TYPE = 128; |
| public static final int ICMPV6_ROUTER_SOLICITATION = 133; |
| public static final int ICMPV6_ROUTER_ADVERTISEMENT = 134; |
| public static final int ICMPV6_NEIGHBOR_SOLICITATION = 135; |
| public static final int ICMPV6_NEIGHBOR_ADVERTISEMENT = 136; |
| public static final int ICMPV6_ND_OPTION_MIN_LENGTH = 8; |
| public static final int ICMPV6_ND_OPTION_LENGTH_SCALING_FACTOR = 8; |
| public static final int ICMPV6_ND_OPTION_SLLA = 1; |
| public static final int ICMPV6_ND_OPTION_TLLA = 2; |
| public static final int ICMPV6_ND_OPTION_MTU = 5; |
| |
| /** |
| * UDP constants. |
| * |
| * See also: |
| * - https://tools.ietf.org/html/rfc768 |
| */ |
| public static final int UDP_HEADER_LEN = 8; |
| |
| |
| /** |
| * DHCP constants. |
| * |
| * See also: |
| * - https://tools.ietf.org/html/rfc2131 |
| */ |
| public static final int INFINITE_LEASE = 0xffffffff; |
| public static final int DHCP4_CLIENT_PORT = 68; |
| |
| private NetworkStackConstants() { |
| throw new UnsupportedOperationException("This class is not to be instantiated"); |
| } |
| } |