## This file is part of Scapy
## See http://www.secdev.org/projects/scapy for more informations
## Copyright (C) Philippe Biondi <phil@secdev.org>
## This program is published under a GPLv2 license

"""
Mobile IP.
"""

from scapy.fields import *
from scapy.packet import *
from scapy.layers.inet import IP,UDP


class MobileIP(Packet):
    name = "Mobile IP (RFC3344)"
    fields_desc = [ ByteEnumField("type", 1, {1:"RRQ", 3:"RRP"}) ]

class MobileIPRRQ(Packet):
    name = "Mobile IP Registration Request (RFC3344)"
    fields_desc = [ XByteField("flags", 0),
                    ShortField("lifetime", 180),
                    IPField("homeaddr", "0.0.0.0"),
                    IPField("haaddr", "0.0.0.0"),
                    IPField("coaddr", "0.0.0.0"),
                    LongField("id", 0), ]

class MobileIPRRP(Packet):
    name = "Mobile IP Registration Reply (RFC3344)"
    fields_desc = [ ByteField("code", 0),
                    ShortField("lifetime", 180),
                    IPField("homeaddr", "0.0.0.0"),
                    IPField("haaddr", "0.0.0.0"),
                    LongField("id", 0), ]

class MobileIPTunnelData(Packet):
    name = "Mobile IP Tunnel Data Message (RFC3519)"
    fields_desc = [ ByteField("nexthdr", 4),
                    ShortField("res", 0) ]


bind_layers( UDP,           MobileIP,           sport=434)
bind_layers( UDP,           MobileIP,           dport=434)
bind_layers( MobileIP,      MobileIPRRQ,        type=1)
bind_layers( MobileIP,      MobileIPRRP,        type=3)
bind_layers( MobileIP,      MobileIPTunnelData, type=4)
bind_layers( MobileIPTunnelData, IP,           nexthdr=4)
