java.lang.Object
- org.opendaylight.openflowplugin.libraries.liblldp.NetUtils

```
public abstract class NetUtils
extends Object
```
Utility class containing the common utility functions needed for operating on networking data structures.

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`MAC_ADDR_LENGTH_IN_BYTES`	Constant holding the number of bytes in MAC Address.
`static int`	`MAC_ADDR_LENGTH_IN_WORDS`	Constant holding the number of words in MAC Address.
`static int`	`NUM_BITS_IN_A_BYTE`	Constant holding the number of bits in a byte.

Constructor Summary

Constructors
Constructor Description

NetUtils()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static int`	`byteArray4ToInt(byte[] ba)`	Converts a 4 bytes array into an integer number.
`static long`	`byteArray6ToLong(byte[] ba)`	Converts a 6 bytes array into a long number MAC addresses.
`static boolean`	`fieldsConflict(int field1, int field2)`
`static byte[]`	`getBroadcastMACAddr()`	Returns Broadcast MAC Address.
`static InetAddress`	`gethighestIP(boolean v6)`	Returns the highest v4 or v6 InetAddress.
`static InetAddress`	`getInetAddress(int address)`	Converts an IP address passed as integer value into the respective InetAddress object.
`static InetAddress`	`getInetNetworkMask(int prefixMaskLength, boolean isV6)`	Return the InetAddress Network Mask given the length of the prefix bit mask.
`static int`	`getSubnetMaskLength(byte[] subnetMask)`	Returns the prefix size in bits of the specified subnet mask.
`static int`	`getSubnetMaskLength(InetAddress subnetMask)`	Returns the prefix size in bits of the specified subnet mask.
`static InetAddress`	`getSubnetPrefix(InetAddress ip, int maskLen)`	Given an IP address and a prefix network mask length, it returns the equivalent subnet prefix IP address Example: for ip = "172.28.30.254" and maskLen = 25 it will return "172.28.30.128".
`static int`	`getUnsignedByte(byte value)`	Returns the unsigned value of the passed byte variable.
`static int`	`getUnsignedShort(short value)`	Return the unsigned value of the passed short variable.
`static boolean`	`inetAddressConflict(InetAddress testAddress, InetAddress filterAddress, InetAddress testMask, InetAddress filterMask)`	Checks if the test address and mask conflicts with the filter address and mask.
`static byte[]`	`intToByteArray4(int number)`	Converts an integer number into a 4 bytes array.
`static boolean`	`isAny(InetAddress ip)`	Returns true if the passed InetAddress contains all zero.
`static boolean`	`isBroadcastMACAddr(byte[] macAddress)`	Returns true if the MAC address is the broadcast MAC address and false otherwise.
`static boolean`	`isIPAddressValid(String cidr)`	Checks if the passed IP address in string form is a valid v4 or v6 address.
`static boolean`	`isIPv4AddressValid(String cidr)`	Checks if the passed IP v4 address in string form is valid The address may specify a mask at the end as "/MM".
`static boolean`	`isIPv6AddressValid(String cidr)`	Checks if the passed IP v6 address in string form is valid The address may specify a mask at the end as "/MMM".
`static boolean`	`isMulticastMACAddr(byte[] macAddress)`	Returns true if the MAC address is a multicast MAC address and false otherwise.
`static boolean`	`isUnicastMACAddr(byte[] macAddress)`	Returns true if the MAC address is a unicast MAC address and false otherwise.
`static boolean`	`isZeroMAC(byte[] mac)`	Returns true if the passed MAC address is all zero.
`static byte[]`	`longToByteArray6(long addr)`	Converts a long number to a 6 bytes array for MAC addresses.
`static InetAddress`	`parseInetAddress(String addressString)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - NUM_BITS_IN_A_BYTE
```
public static final int NUM_BITS_IN_A_BYTE
```
    Constant holding the number of bits in a byte.
    
    See Also:
    
    Constant Field Values
  - MAC_ADDR_LENGTH_IN_BYTES
```
public static final int MAC_ADDR_LENGTH_IN_BYTES
```
    Constant holding the number of bytes in MAC Address.
    
    See Also:
    
    Constant Field Values
  - MAC_ADDR_LENGTH_IN_WORDS
```
public static final int MAC_ADDR_LENGTH_IN_WORDS
```
    Constant holding the number of words in MAC Address.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - NetUtils
```
public NetUtils()
```
- Method Detail
  - byteArray4ToInt
```
public static int byteArray4ToInt(byte[] ba)
```
    Converts a 4 bytes array into an integer number.
    
    Parameters:
    
    ba - the 4 bytes long byte array
    
    Returns:
    
    the integer number
  - byteArray6ToLong
```
public static long byteArray6ToLong(byte[] ba)
```
    Converts a 6 bytes array into a long number MAC addresses.
    
    Parameters:
    
    ba - The 6 bytes long byte array.
    
    Returns:
    
    The long number. Zero is returned if ba is null or the length of it is not six.
  - longToByteArray6
```
public static byte[] longToByteArray6(long addr)
```
    Converts a long number to a 6 bytes array for MAC addresses.
    
    Parameters:
    
    addr - The long number.
    
    Returns:
    
    The byte array.
  - intToByteArray4
```
public static byte[] intToByteArray4(int number)
```
    Converts an integer number into a 4 bytes array.
    
    Parameters:
    
    number - the integer number
    
    Returns:
    
    the byte array
  - getInetAddress
```
public static InetAddress getInetAddress(int address)
```
    Converts an IP address passed as integer value into the respective InetAddress object.
    
    Parameters:
    
    address - the IP address in integer form
    
    Returns:
    
    the IP address in InetAddress form
  - getInetNetworkMask
```
public static InetAddress getInetNetworkMask(int prefixMaskLength,
                                             boolean isV6)
```
    Return the InetAddress Network Mask given the length of the prefix bit mask. The prefix bit mask indicates the contiguous leading bits that are NOT masked out. Example: A prefix bit mask length of 8 will give an InetAddress Network Mask of 255.0.0.0
    
    Parameters:
    
    prefixMaskLength - integer representing the length of the prefix network mask
    
    isV6 - boolean representing the IP version of the returned address
  - getSubnetMaskLength
```
public static int getSubnetMaskLength(byte[] subnetMask)
```
    Returns the prefix size in bits of the specified subnet mask. Example: For the subnet mask ff.ff.ff.e0 it returns 25 while for ff.00.00.00 it returns 8. If the passed subnetMask array is null, 0 is returned.
    
    Parameters:
    
    subnetMask - the subnet mask as byte array
    
    Returns:
    
    the prefix length as number of bits
  - getSubnetMaskLength
```
public static int getSubnetMaskLength(InetAddress subnetMask)
```
    Returns the prefix size in bits of the specified subnet mask. Example: For the subnet mask 255.255.255.128 it returns 25 while for 255.0.0.0 it returns 8. If the passed subnetMask object is null, 0 is returned
    
    Parameters:
    
    subnetMask - the subnet mask as InetAddress
    
    Returns:
    
    the prefix length as number of bits
  - getSubnetPrefix
```
public static InetAddress getSubnetPrefix(InetAddress ip,
                                          int maskLen)
```
    Given an IP address and a prefix network mask length, it returns the equivalent subnet prefix IP address Example: for ip = "172.28.30.254" and maskLen = 25 it will return "172.28.30.128".
    
    Parameters:
    
    ip - the IP address in InetAddress form
    
    maskLen - the length of the prefix network mask
    
    Returns:
    
    the subnet prefix IP address in InetAddress form
  - inetAddressConflict
```
public static boolean inetAddressConflict(InetAddress testAddress,
                                          InetAddress filterAddress,
                                          InetAddress testMask,
                                          InetAddress filterMask)
```
    Checks if the test address and mask conflicts with the filter address and mask.
    For example: testAddress: 172.28.2.23 testMask: 255.255.255.0 filterAddress: 172.28.1.10 testMask: 255.255.255.0 do conflict
    testAddress: 172.28.2.23 testMask: 255.255.255.0 filterAddress: 172.28.1.10 testMask: 255.255.0.0 do not conflict
    Null parameters are permitted.
  - isZeroMAC
```
public static boolean isZeroMAC(byte[] mac)
```
    Returns true if the passed MAC address is all zero.
    
    Parameters:
    
    mac - the byte array representing the MAC address
    
    Returns:
    
    true if all MAC bytes are zero
  - isBroadcastMACAddr
```
public static boolean isBroadcastMACAddr(byte[] macAddress)
```
    Returns true if the MAC address is the broadcast MAC address and false otherwise.
  - isUnicastMACAddr
```
public static boolean isUnicastMACAddr(byte[] macAddress)
```
    Returns true if the MAC address is a unicast MAC address and false otherwise.
  - isMulticastMACAddr
```
public static boolean isMulticastMACAddr(byte[] macAddress)
```
    Returns true if the MAC address is a multicast MAC address and false otherwise. Note that this explicitly returns false for the broadcast MAC address.
  - isAny
```
public static boolean isAny(InetAddress ip)
```
    Returns true if the passed InetAddress contains all zero.
    
    Parameters:
    
    ip - the IP address to test
    
    Returns:
    
    true if the address is all zero
  - fieldsConflict
```
public static boolean fieldsConflict(int field1,
                                     int field2)
```
  - parseInetAddress
```
public static InetAddress parseInetAddress(String addressString)
```
  - isIPv4AddressValid
```
public static boolean isIPv4AddressValid(String cidr)
```
    Checks if the passed IP v4 address in string form is valid The address may specify a mask at the end as "/MM".
    
    Parameters:
    
    cidr - the v4 address as A.B.C.D/MM
  - isIPv6AddressValid
```
public static boolean isIPv6AddressValid(String cidr)
```
    Checks if the passed IP v6 address in string form is valid The address may specify a mask at the end as "/MMM".
    
    Parameters:
    
    cidr - the v6 address as A::1/MMM
  - isIPAddressValid
```
public static boolean isIPAddressValid(String cidr)
```
    Checks if the passed IP address in string form is a valid v4 or v6 address. The address may specify a mask at the end as "/MMM"
    
    Parameters:
    
    cidr - the v4 or v6 address as IP/MMM
  - getUnsignedByte
```
public static int getUnsignedByte(byte value)
```
    Returns the unsigned value of the passed byte variable.
    
    Parameters:
    
    value - the byte value
    
    Returns:
    
    the int variable containing the unsigned byte value
  - getUnsignedShort
```
public static int getUnsignedShort(short value)
```
    Return the unsigned value of the passed short variable.
    
    Parameters:
    
    value - the short value
    
    Returns:
    
    the int variable containing the unsigned short value
  - gethighestIP
```
public static InetAddress gethighestIP(boolean v6)
```
    Returns the highest v4 or v6 InetAddress.
    
    Parameters:
    
    v6 - true for IPv6, false for Ipv4
    
    Returns:
    
    The highest IPv4 or IPv6 address
  - getBroadcastMACAddr
```
public static byte[] getBroadcastMACAddr()
```
    Returns Broadcast MAC Address.
    
    Returns:
    
    the byte array containing broadcast mac address

Class NetUtils

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

NUM_BITS_IN_A_BYTE

MAC_ADDR_LENGTH_IN_BYTES

MAC_ADDR_LENGTH_IN_WORDS

Constructor Detail

NetUtils

Method Detail

byteArray4ToInt

byteArray6ToLong

longToByteArray6

intToByteArray4

getInetAddress

getInetNetworkMask

getSubnetMaskLength

getSubnetMaskLength

getSubnetPrefix

inetAddressConflict

isZeroMAC

isBroadcastMACAddr

isUnicastMACAddr

isMulticastMACAddr

isAny

fieldsConflict

parseInetAddress

isIPv4AddressValid

isIPv6AddressValid

isIPAddressValid

getUnsignedByte

getUnsignedShort

gethighestIP

getBroadcastMACAddr