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/*
* Copyright (C) 2016 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 android.net.util;
import java.nio.ByteBuffer;
/**
* Networking protocol constants.
*
* Includes:
* - constants that describe packet layout
* - various helper functions
*
* @hide
*/
public final class NetworkConstants {
private NetworkConstants() { throw new RuntimeException("no instance permitted"); }
/**
* 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;
private static final byte FF = asByte(0xff);
public static final byte[] ETHER_ADDR_BROADCAST = {
FF, FF, FF, FF, FF, FF
};
public static final int ETHER_MTU = 1500;
/**
* 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 als:
* - 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_BITS = 32;
public static final int IPV4_ADDR_LEN = 4;
/**
* IPv6 constants.
*
* See also:
* - https://tools.ietf.org/html/rfc2460
*/
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;
public static final int IPV6_ADDR_BITS = 128;
public static final int IPV6_ADDR_LEN = 16;
public static final int IPV6_MIN_MTU = 1280;
public static final int RFC7421_PREFIX_LENGTH = 64;
public static final int RFC6177_MIN_PREFIX_LENGTH = 48;
/**
* ICMP common (v4/v6) constants.
*
* See also:
* - https://tools.ietf.org/html/rfc792
* - https://tools.ietf.org/html/rfc4443
*/
public static final int ICMP_HEADER_TYPE_OFFSET = 0;
public static final int ICMP_HEADER_CODE_OFFSET = 1;
public static final int ICMP_HEADER_CHECKSUM_OFFSET = 2;
public static final int ICMP_ECHO_IDENTIFIER_OFFSET = 4;
public static final int ICMP_ECHO_SEQUENCE_NUMBER_OFFSET = 6;
public static final int ICMP_ECHO_DATA_OFFSET = 8;
/**
* ICMPv4 constants.
*
* See also:
* - https://tools.ietf.org/html/rfc792
*/
public static final int ICMPV4_ECHO_REQUEST_TYPE = 8;
/**
* 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_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;
public static final int ICMPV6_ECHO_REQUEST_TYPE = 128;
/**
* UDP constants.
*
* See also:
* - https://tools.ietf.org/html/rfc768
*/
public static final int UDP_HEADER_LEN = 8;
/**
* DHCP(v4) constants.
*
* See also:
* - https://tools.ietf.org/html/rfc2131
*/
public static final int DHCP4_SERVER_PORT = 67;
public static final int DHCP4_CLIENT_PORT = 68;
/**
* DNS constants.
*
* See also:
* - https://tools.ietf.org/html/rfc1035
*/
public static final int DNS_SERVER_PORT = 53;
/**
* Utility functions.
*/
public static byte asByte(int i) { return (byte) i; }
public static String asString(int i) { return Integer.toString(i); }
public static int asUint(byte b) { return (b & 0xff); }
public static int asUint(short s) { return (s & 0xffff); }
}
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