NetPacket::IPv6 - Assemble and disassemble IPv6 (Internet Protocol
version 6) packets.
use NetPacket::IPv6;
$ip_obj = NetPacket::IPv6->decode($raw_pkt);
$ip_pkt = NetPacket::IPv6->encode($ip_obj);
$ip_data = NetPacket::IPv6::strip($raw_pkt);
"NetPacket::IPv6" provides a set
of routines for assembling and disassembling packets using IPv6 (Internet
Protocol version 6).
- "NetPacket::IPv6->decode([RAW PACKET])"
- Decode the raw packet data given and return an object containing instance
data. This method will quite happily decode garbage input. It is the
responsibility of the programmer to ensure valid packet data is passed to
this method.
- "NetPacket::IPv6->encode()"
- Return an IPv6 packet encoded with the instance data specified. This will
infer the total length of the packet automatically from the payload length
and length of any extension headers.
- "NetPacket::IPv6->pseudo_header([PACKET LENGTH],
[PROTOCOL])"
- Return an IPv6 "pseudo-header" suitable for computing checksums
for certain upper-level protocols.
- "NetPacket::IPv6::strip([RAW PACKET])"
- Return the encapsulated data (or payload) contained in the IPv6 packet.
This data is suitable to be used as input for other
"NetPacket::*" modules.
This function is equivalent to creating an object using the
"decode()" constructor and returning
the "data" field of that object.
- "NetPacket::IPv6::ipv6_extheader([TYPE])"
- Return whether the IP protocol type is an IPv6 extension header.
The instance data for the
"NetPacket::IPv6" object consists of the
following fields.
- ver
- The IP version number of this packet.
- traffic_class
- The traffic class of this packet, equivalent to the type-of-service field
for IPv4.
- flow_label
- The flow label of this packet.
- len
- The payload length (including any extension headers) in bytes for this
packet.
- proto
- The IP protocol number for this packet.
- hop_limit
- The hop limit for this packet, equivalent to the time-to-live field for
IPv4.
- src_ip
- The source IP address for this packet in colon-separated hextet
notation.
- dest_ip
- The destination IP address for this packet in colon-separated hextet
notation.
- Array of any extension headers for this packet, as a hashref containing
the fields described below. An ESP (Encapsulating Security Payload) header
will not be represented here; as it and any further extension headers and
the payload data will be encrypted, it will be instead represented as the
packet payload data itself, with a protocol number of 50
("IPv6_EXTHEADER_ESP").
- data
- The encapsulated data (payload) for this IPv6 packet.
Extension headers may contain the following fields.
- type
- The extension header type number.
- len
- The extension header length, in 8-byte units, minus the first 8-byte unit.
(For Authentication extension headers, this length is in 4-byte units,
minus the first two 4-byte units.)
- data
- The remaining contents of the extension header following the next-header
and length bytes.
- default
- none
- tags
- The following tags group together related exportable items.
- ":protos"
- ":tos"
- ":misc"
- Re-exported from NetPacket::IP for convenience.
- ":extheaders"
- IPv6_EXTHEADER_HOPBYHOP IPv6_EXTHEADER_ROUTING IPv6_EXTHEADER_FRAGMENT
IPv6_EXTHEADER_ESP IPv6_EXTHEADER_AUTH IPv6_EXTHEADER_NONEXT
IPv6_EXTHEADER_DESTOPT IPv6_EXTHEADER_MOBILITY IPv6_EXTHEADER_HOSTIDENT
IPv6_EXTHEADER_SHIM6 IPv6_EXTHEADER_TESTING1 IPv6_EXTHEADER_TESTING2
- ":versions"
- IP_VERSION_IPv6
- ":strip"
- Import the strip function
"ipv6_strip".
- ":ALL"
- All the above exportable items.
The following script dumps IPv6 frames by IP address and protocol
to standard output.
#!/usr/bin/perl -w
use strict;
use Net::PcapUtils;
use NetPacket::Ethernet qw(:strip);
use NetPacket::IPv6;
sub process_pkt {
my ($user, $hdr, $pkt) = @_;
my $ip_obj = NetPacket::IPv6->decode(eth_strip($pkt));
print("$ip_obj->{src_ip}:$ip_obj->{dest_ip} $ip_obj->{proto}\n");
}
Net::PcapUtils::loop(\&process_pkt, FILTER => 'ip6');
Copyright (c) 2018 Dan Book.
This module is free software. You can redistribute it and/or
modify it under the terms of the Artistic License 2.0.
This program is distributed in the hope that it will be useful,
but without any warranty; without even the implied warranty of
merchantability or fitness for a particular purpose.
Dan Book <dbook@cpan.org>