1NetPacket::IPv6(3)    User Contributed Perl Documentation   NetPacket::IPv6(3)
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NAME

6       NetPacket::IPv6 - Assemble and disassemble IPv6 (Internet Protocol
7       version 6) packets.
8

VERSION

10       version 1.7.2
11

SYNOPSIS

13         use NetPacket::IPv6;
14
15         $ip_obj = NetPacket::IPv6->decode($raw_pkt);
16         $ip_pkt = NetPacket::IPv6->encode($ip_obj);
17         $ip_data = NetPacket::IPv6::strip($raw_pkt);
18

DESCRIPTION

20       "NetPacket::IPv6" provides a set of routines for assembling and
21       disassembling packets using IPv6 (Internet Protocol version 6).
22
23   Methods
24       "NetPacket::IPv6->decode([RAW PACKET])"
25           Decode the raw packet data given and return an object containing
26           instance data.  This method will quite happily decode garbage
27           input.  It is the responsibility of the programmer to ensure valid
28           packet data is passed to this method.
29
30       "NetPacket::IPv6->encode()"
31           Return an IPv6 packet encoded with the instance data specified.
32           This will infer the total length of the packet automatically from
33           the payload length and length of any extension headers.
34
35       "NetPacket::IPv6->pseudo_header([PACKET LENGTH], [PROTOCOL])"
36           Return an IPv6 "pseudo-header" suitable for computing checksums for
37           certain upper-level protocols.
38
39   Functions
40       "NetPacket::IPv6::strip([RAW PACKET])"
41           Return the encapsulated data (or payload) contained in the IPv6
42           packet.  This data is suitable to be used as input for other
43           "NetPacket::*" modules.
44
45           This function is equivalent to creating an object using the
46           decode() constructor and returning the "data" field of that object.
47
48       NetPacket::IPv6::ipv6_extheader([TYPE])
49           Return whether the IP protocol type is an IPv6 extension header.
50
51   Instance data
52       The instance data for the "NetPacket::IPv6" object consists of the
53       following fields.
54
55       ver The IP version number of this packet.
56
57       traffic_class
58           The traffic class of this packet, equivalent to the type-of-service
59           field for IPv4.
60
61       flow_label
62           The flow label of this packet.
63
64       len The payload length (including any extension headers) in bytes for
65           this packet.
66
67       proto
68           The IP protocol number for this packet.
69
70       hop_limit
71           The hop limit for this packet, equivalent to the time-to-live field
72           for IPv4.
73
74       src_ip
75           The source IP address for this packet in colon-separated hextet
76           notation.
77
78       dest_ip
79           The destination IP address for this packet in colon-separated
80           hextet notation.
81
82       extheaders
83           Array of any extension headers for this packet, as a hashref
84           containing the fields described below. An ESP (Encapsulating
85           Security Payload) header will not be represented here; as it and
86           any further extension headers and the payload data will be
87           encrypted, it will be instead represented as the packet payload
88           data itself, with a protocol number of 50 ("IPv6_EXTHEADER_ESP").
89
90       data
91           The encapsulated data (payload) for this IPv6 packet.
92
93       Extension headers may contain the following fields.
94
95       type
96           The extension header type number.
97
98       len The extension header length, in 8-byte units, minus the first
99           8-byte unit.  (For Authentication extension headers, this length is
100           in 4-byte units, minus the first two 4-byte units.)
101
102       data
103           The remaining contents of the extension header following the next-
104           header and length bytes.
105
106   Exports
107       default
108           none
109
110       tags
111           The following tags group together related exportable items.
112
113           ":protos"
114           ":tos"
115           ":misc"
116               Re-exported from NetPacket::IP for convenience.
117
118           ":extheaders"
119               IPv6_EXTHEADER_HOPBYHOP IPv6_EXTHEADER_ROUTING
120               IPv6_EXTHEADER_FRAGMENT IPv6_EXTHEADER_ESP IPv6_EXTHEADER_AUTH
121               IPv6_EXTHEADER_NONEXT IPv6_EXTHEADER_DESTOPT
122               IPv6_EXTHEADER_MOBILITY IPv6_EXTHEADER_HOSTIDENT
123               IPv6_EXTHEADER_SHIM6 IPv6_EXTHEADER_TESTING1
124               IPv6_EXTHEADER_TESTING2
125
126           ":versions"
127               IP_VERSION_IPv6
128
129           ":strip"
130               Import the strip function "ipv6_strip".
131
132           ":ALL"
133               All the above exportable items.
134

EXAMPLE

136       The following script dumps IPv6 frames by IP address and protocol to
137       standard output.
138
139         #!/usr/bin/perl -w
140
141         use strict;
142         use Net::PcapUtils;
143         use NetPacket::Ethernet qw(:strip);
144         use NetPacket::IPv6;
145
146         sub process_pkt {
147             my ($user, $hdr, $pkt) = @_;
148
149             my $ip_obj = NetPacket::IPv6->decode(eth_strip($pkt));
150             print("$ip_obj->{src_ip}:$ip_obj->{dest_ip} $ip_obj->{proto}\n");
151         }
152
153         Net::PcapUtils::loop(\&process_pkt, FILTER => 'ip6');
154

TODO

156       More specific keys for well-defined extension headers.
157       Parse routing extension headers to correctly compute upper-level
158       checksums.
159

161       Copyright (c) 2018 Dan Book.
162
163       This module is free software.  You can redistribute it and/or modify it
164       under the terms of the Artistic License 2.0.
165
166       This program is distributed in the hope that it will be useful, but
167       without any warranty; without even the implied warranty of
168       merchantability or fitness for a particular purpose.
169

AUTHOR

171       Dan Book <dbook@cpan.org>
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175perl v5.36.0                      2023-01-20                NetPacket::IPv6(3)
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