NAME

       packet.internet.ipv4 - IPv4 module

DESCRIPTION

       Decode IP version 4 layer.

CLASSES

   class Flags(baseobj.BaseObj)
       Flags object

       Methods defined here:
       ---------------------

       __init__(self, data)
       Constructor which takes a single byte as input

   class IPv4(baseobj.BaseObj)
       IPv4 object

       Usage:
           from packet.internet.ipv4 import IPv4

           x = IPv4(pktt)

       Object definition:

       IPv4(
           version         = int,
           IHL             = int, # Internet Header Length (in 32bit words)
           header_size     = int, # IHL in actual bytes
           DSCP            = int, # Differentiated Services Code Point
           ECN             = int, # Explicit Congestion Notification
           total_size      = int, # Total length
           id              = int, # Identification
           flags = Flags(         # Flags:
               DF = int,          #   Don't Fragment
               MF = int,          #   More Fragments
           )
           fragment_offset = int, # Fragment offset (in 8-byte blocks)
           TTL             = int, # Time to Live
           protocol        = int, # Protocol of next layer (RFC790)
           checksum        = int, # Header checksum
           src             = "%d.%d.%d.%d", # source IP address
           dst             = "%d.%d.%d.%d", # destination IP address
           options = string, # IP options if available
           psize = int       # Payload data size
           data = string,    # Raw data of payload if protocol
                             # is not supported
       )

       Methods defined here:
       ---------------------

       __init__(self, pktt)
       Constructor

       Initialize object's private data.

              pktt:  Packet trace object (packet.pktt.Pktt) so this layer has
                     access to the parent layers.

       __str__(self)
       String representation of object

       The representation depends on the verbose level set by debug_repr().
       If set to 0 the generic object representation is returned.
       If set to 1 the representation of the object is condensed:
           '192.168.0.20 -> 192.168.0.61 '

       If set to 2 the representation of the object also includes the
       protocol and length of payload:
           '192.168.0.20 -> 192.168.0.61, protocol: 17(UDP), len: 84'

SEE ALSO

       baseobj(3), packet.transport.tcp(3), packet.transport.udp(3), packet.utils(3)

BUGS

       No known bugs.

AUTHOR

       Jorge Mora (mora@netapp.com)