1# $Id: icmp6.py 23 2006-11-08 15:45:33Z dugsong $
2# -*- coding: utf-8 -*-
3"""Internet Control Message Protocol for IPv6."""
4from __future__ import absolute_import
5
6from . import dpkt
7
8ICMP6_DST_UNREACH = 1  # dest unreachable, codes:
9ICMP6_PACKET_TOO_BIG = 2  # packet too big
10ICMP6_TIME_EXCEEDED = 3  # time exceeded, code:
11ICMP6_PARAM_PROB = 4  # ip6 header bad
12
13ICMP6_ECHO_REQUEST = 128  # echo service
14ICMP6_ECHO_REPLY = 129  # echo reply
15MLD_LISTENER_QUERY = 130  # multicast listener query
16MLD_LISTENER_REPORT = 131  # multicast listener report
17MLD_LISTENER_DONE = 132  # multicast listener done
18
19# RFC2292 decls
20ICMP6_MEMBERSHIP_QUERY = 130  # group membership query
21ICMP6_MEMBERSHIP_REPORT = 131  # group membership report
22ICMP6_MEMBERSHIP_REDUCTION = 132  # group membership termination
23
24ND_ROUTER_SOLICIT = 133  # router solicitation
25ND_ROUTER_ADVERT = 134  # router advertisment
26ND_NEIGHBOR_SOLICIT = 135  # neighbor solicitation
27ND_NEIGHBOR_ADVERT = 136  # neighbor advertisment
28ND_REDIRECT = 137  # redirect
29
30ICMP6_ROUTER_RENUMBERING = 138  # router renumbering
31
32ICMP6_WRUREQUEST = 139  # who are you request
33ICMP6_WRUREPLY = 140  # who are you reply
34ICMP6_FQDN_QUERY = 139  # FQDN query
35ICMP6_FQDN_REPLY = 140  # FQDN reply
36ICMP6_NI_QUERY = 139  # node information request
37ICMP6_NI_REPLY = 140  # node information reply
38
39ICMP6_MAXTYPE = 201
40
41
42class ICMP6(dpkt.Packet):
43    """Internet Control Message Protocol for IPv6.
44
45    TODO: Longer class information....
46
47    Attributes:
48        __hdr__: Header fields of ICMPv6.
49        TODO.
50    """
51
52    __hdr__ = (
53        ('type', 'B', 0),
54        ('code', 'B', 0),
55        ('sum', 'H', 0)
56    )
57
58    class Error(dpkt.Packet):
59        __hdr__ = (('pad', 'I', 0), )
60
61        def unpack(self, buf):
62            dpkt.Packet.unpack(self, buf)
63            from . import ip6
64            self.data = self.ip6 = ip6.IP6(self.data)
65
66    class Unreach(Error):
67        pass
68
69    class TooBig(Error):
70        __hdr__ = (('mtu', 'I', 1232), )
71
72    class TimeExceed(Error):
73        pass
74
75    class ParamProb(Error):
76        __hdr__ = (('ptr', 'I', 0), )
77
78    class Echo(dpkt.Packet):
79        __hdr__ = (('id', 'H', 0), ('seq', 'H', 0))
80
81    _typesw = {1: Unreach, 2: TooBig, 3: TimeExceed, 4: ParamProb, 128: Echo, 129: Echo}
82
83    def unpack(self, buf):
84        dpkt.Packet.unpack(self, buf)
85        try:
86            self.data = self._typesw[self.type](self.data)
87            setattr(self, self.data.__class__.__name__.lower(), self.data)
88        except (KeyError, dpkt.UnpackError):
89            pass
90