Provided by: ipv6toolkit_2.0+ds.1-2build2_amd64 
NAME
udp6 - A security assessment tool for UDP/IPv6 implementations
SYNOPSIS
udp6 -i INTERFACE [-S LINK_SRC_ADDR] [-D LINK-DST-ADDR] [-s SRC_ADDR[/LEN]] [-d DST_ADDR] [-A HOP_LIMIT]
[-y FRAG_SIZE] [-u DST_OPT_HDR_SIZE] [-U DST_OPT_U_HDR_SIZE] [-H HBH_OPT_HDR_SIZE] [-P PAYLOAD_SIZE] [-o
SRC_PORT] [-a DST_PORT] [-Z DATA] [-j PREFIX[/LEN]] [-k PREFIX[/LEN]] [-J LINK_ADDR] [-K LINK_ADDR] [-b
PREFIX[/LEN]] [-g PREFIX[/LEN]] [-B LINK_ADDR] [-G LINK_ADDR] [-F N_SOURCES] [-T N_PORTS] [-L] [-l] [-p
PROBE_MODE] [-z SECONDS] [-r RATE] [-v] [-h]
DESCRIPTION
udp6 allows the assessment of IPv6 implementations with respect to a variety of attack vectors based on
UDP/IPv6 datagrams. This tool is part of the SI6 Networks' IPv6 Toolkit: a security assessment and
troubleshooting toolkit for the IPv6 protocols.
udp6 tool has two modes of operation: active and listening. In active mode, the tool attacks a specific
target, while in listening mode the tool listens to UDP traffic on the local network, and launches an
attack in response to such traffic. Active mode is employed if an IPv6 Destination Address is specified.
Listening mode is employed if the "-L" option (or its long counterpart "--listen") is set. If both an
attack target and the "-L" option are specified, the attack is launched against the specified target, and
then the tool enters listening mode to respond incoming packets with UDP datagrams.
udp6 supports filtering of incoming packets based on the Ethernet Source Address, the Ethernet
Destination Address, the IPv6 Source Address, and the IPv6 Destination Address. There are two types of
filters: "block filters" and "accept filters". If any "block filter" is specified, and the incoming
packet matches any of those filters, the message is discarded (and thus no UDP datagrams are sent in
response). If any "accept filter" is specified, incoming packets must match the specified filters in
order for the tool to respond with UDP datagrams.
OPTIONS
udp6 takes itS parameters as command-line options. Each of the options can be specified with a short name
(one character preceded with the hyphen character, as e.g. "-i") or with a long name (a string preceded
with two hyphen characters, as e.g. "--interface").
If the tool is instructed to e.g. flood the victim with UDP datagrams from different sources
("--flood-sources" option), multiple packets may need to be generated.
udp6 supports IPv6 Extension Headers, including the IPv6 Fragmentation Header, which might be of use to
circumvent layer-2 filtering and/or Network Intrusion Detection Systems (NIDS). However, IPv6 extension
headers are not employed by default, and must be explicitly enabled with the corresponding options.
-i INTERFACE, --interface INTERFACE
This option specifies the network interface that the tool will use. The network interface must be
specified (i.e., the tool does not select any network interface "by default").
-S SRC_LINK_ADDR, --src-link-address SRC_LINK_ADDR
This option specifies the link-layer Source Address of the probe packets. If left unspecified, the
link-layer Source Address of the packets is set to the real link-layer address of the network
interface. Note: this option is meaningful only when the underlying link-layer technology is
Ethernet.
-D DST_LINK_ADDR, --dst-link-address DST_LINK_ADDR
This option specifies the link-layer Destination Address of the probe packets. By default, the
link-layer Destination Address is automatically set to the link-layer address of the destination
host (for on-link destinations) or to the link-layer address of the first-hop router. Note: this
option is meaningful only when the underlying link-layer technology is Ethernet.
-s SRC_ADDR, --src-address SRC_ADDR
This option specifies the IPv6 source address (or IPv6 prefix) to be used for the Source Address
of the attack packets. If the "-F" ("--flood-sources") option is specified, this option includes
an IPv6 prefix, from which random addresses are selected. See the description of the "-F" option
for further information on how the "-s" option is processed in that specific case.
Note: When operating in "listening" mode, the Source Address is automatically set to the
Destination Address of the incoming packet.
-d DST_ADDR, --dst-address DST_ADDR
This option specifies the IPv6 Destination Address of the victim. It can be left unspecified only
if the "-L" option is selected (i.e., if the tool is to operate in "listening" mode).
Note: When operating in "listening" mode, the Destination Address is automatically set to the
Source Address of the incoming packet.
-A HOP_LIMIT, --hop-limit HOP_LIMIT
This option specifies the Hop Limit to be used for the IPv6 packets. It defaults to 255.
-u HDR_SIZE, --dst-opt-hdr HDR_SIZE
This option specifies that a Destination Options header is to be included in the outgoing
packet(s). The extension header size must be specified as an argument to this option (the header
is filled with padding options). Multiple Destination Options headers may be specified by means of
multiple "-u" options.
-U HDR_SIZE, --dst-opt-u-hdr HDR_SIZE
This option specifies a Destination Options header to be included in the "unfragmentable part" of
the outgoing packet(s). The header size must be specified as an argument to this option (the
header is filled with padding options). Multiple Destination Options headers may be specified by
means of multiple "-U" options.
-H HDR_SIZE, --hbh-opt-hdr HDR_SIZE
This option specifies that a Hop-by-Hop Options header is to be included in the outgoing
packet(s). The header size must be specified as an argument to this option (the header is filled
with padding options). Multiple Hop-by-Hop Options headers may be specified by means of multiple
"-H" options.
-y FRAG_SIZE, --frag-hdr FRAG_SIZE
This option specifies that the resulting packet must be fragmented. The fragment size must be
specified as an argument to this option.
-P PAYLOAD_SIZE, --payload-size PAYLOAD_SIZE
This options specifies the size of the UDP payload. It defaults to 0 (i.e., empty UDP datagrams).
-o SRC_PORT, --src-port SRC_PORT
This option specifies the UDP Source Port.
-a DST_PORT, --dst-port DST_PORT
This option specifies the UDP Destination Port.
-Z DATA, --data DATA
This option is used to specify the UDP payload. It will typically include an application-layer
request. Note: the string used for the DATA parameter can contain the "\r" and "\n" C-style escape
senquenced for representing "carriage return" and "line feed" (respectively).
As an example, this option could be employed to send an HTTP request if set as '--data "GET /
HTTP/1.0\r\n\r\n"'.
-j SRC_ADDR, --block-src SRC_ADDR
This option sets a block filter for the incoming packets, based on their IPv6 Source Address. It
allows the specification of an IPv6 prefix in the form "-j prefix/prefixlen". If the prefix length
is not specified, a prefix length of "/128" is selected (i.e., the option assumes that a single
IPv6 address, rather than an IPv6 prefix, has been specified).
-k DST_ADDR, --block-dst DST_ADDR
This option sets a block filter for the incoming packets, based on their IPv6 Destination Address.
It allows the specification of an IPv6 prefix in the form "-k prefix/prefixlen". If the prefix
length is not specified, a prefix length of "/128" is selected (i.e., the option assumes that a
single IPv6 address, rather than an IPv6 prefix, has been specified).
-J LINK_ADDR, --block-link-src LINK_ADDR
This option sets a block filter for the incoming packets, based on their link-layer Source
Address. The option must be followed by a link-layer address (currently, only Ethernet is
supported).
-K LINK_ADDR, --block-link-dst LINK_ADDR
This option sets a block filter for the incoming packets, based on their link-layer Destination
Address. The option must be followed by a link-layer address (currently, only Ethernet is
supported).
-b SRC_ADDR, --accept-src SRC_ADDR
This option sets an accept filter for the incoming packets, based on their IPv6 Source Address. It
allows the specification of an IPv6 prefix in the form "-b prefix/prefixlen". If the prefix length
is not specified, a prefix length of "/128" is selected (i.e., the option assumes that a single
IPv6 address, rather than an IPv6 prefix, has been specified).
-g DST_ADDR, --accept-dst DST_ADDR
This option sets a accept filter for the incoming packets, based on their IPv6 Destination
Address. It allows the specification of an IPv6 prefix in the form "-g prefix/prefixlen". If the
prefix length is not specified, a prefix length of "/128" is selected (i.e., the option assumes
that a single IPv6 address, rather than an IPv6 prefix, has been specified).
-B LINK_ADDR, --accept-link-src LINK_ADDR
This option sets an accept filter for the incoming packets, based on their link-layer Source
Address. The option must be followed by a link-layer address (currently, only Ethernet is
supported).
-G LINK_ADDR, --accept-link-dst LINK_ADDR
This option sets an accept filter for the incoming packets, based on their link-layer Destination
Address. The option must be followed by a link-layer address (currently, only Ethernet is
supported).
-F N_SOURCES, --flood-sources N_SOURCES
This option instructs the tool to send multiple UDP datagrams with different Source Addresses. The
number of different source addresses is specified as "-F number". The Source Address of each UDP
datagram is randomly selected from the prefix specified by the "-s" option. If the "-F" option is
specified but the "-s" option is left unspecified, the Source Address of the packets is randomly
selected from the prefix ::/0.
-T N_PORTS, --flood-ports N_PORTS
This option instructs the tool to send multiple UDP datagrams with different Source Ports. The
Source Port of each UDP datagram is randomly selected from the whole port number space (0-65535).
-l, --loop
This option instructs the udp6 tool to send periodic UDP datagrams to the victim node. The amount
of time to pause between sending UDP datagrams can be specified by means of the "-z" option, and
defaults to 1 second. Note that this option cannot be set in conjunction with the "-L"
("--listen") option.
-z, --sleep
This option specifies the amount of time to pause between sending UDP datagrams (when the "--loop"
option is set). If left unspecified, it defaults to 1 second.
-r RATE, --rate-limit RATE
This option specifies the rate limit to use when performing a remote address scan. "RATE" should
be specified as "xbps" or "xpps" (with "x" being an unsigned integer), for rate-limits in bits per
second or packets per second, respectively.
-L, --listen
This instructs the udp6 tool to operate in listening mode (possibly after attacking a given node).
Note that this option cannot be used in conjunction with the "-l" ("--loop") option.
-p PROBE_MODE, --probe-mode PROBE_MODE
This option instructs th too to operate in probe mode. The specific probe mode is specified as an
argument to this option (currently, only "script" mode is supported). In probe mode, the udp6
sends probe datagrams, and waits for response packets. The response packets are decoded based on
the selected probe mode.
In the "script" probe mode, the tool decodes UDP datagrams as follows:
RESPONSE:RESPONSE_TYPE:RESPONSE_DECODE...
Where the string RESPONSE is fixed, and RESPONSE_TYPE indicates the response received. As of this
version of the tool, the following RESPONSE_TYPE values are supported:
+ UDP6: Indicates that the tool received a UDP/IPv6 packet
+ TIMEOUT: Indicates that the tool received no response
Possibe output lines of the tool are:
RESPONSE:TIMEOUT:
RESPONSE:UDP6:
Note: Future versions of the tool will also decode ICMPv6 error messages, and will include
additional data regarding the incoming UDP datagrams (e.g., payload size).
-v, --verbose
This option instructs the udp6 tool to be verbose. When the option is set twice, the tool is
"very verbose", and the tool also informs which packets have been accepted or discarded as a
result of applying the specified filters.
-h, --help
Print help information for the udp6 tool.
EXAMPLES
The following sections illustrate typical use cases of the udp6 tool.
Example #1
# udp6 -s fc00:1::/64 -d fc00:1::1 -a 22 -F 100 -l -z 1 -v
In this example the udp6 tool is essentially employed to flood port number 22 of the host fc00:1::1. The
tool sends UDP datagrams from the prefix fc00:1::/64 (as specified by the "-s" option) to port 22
(specified by the "-a" option) at the destination address fc00:1::1 (specified by the "-d" option). The
tool sends UDP datagrams from 100 different addresses (as specified by the "-F" option) every one second
(as specified by the "-l" and "-z" options). The tool will be verbose (as specified by the "-v" option).
Example #3
# udp6 -d fc00:1::1 -a 80 -l -r 1pps -v --data "GET / HTTP/1.0\r\n\r\n"
Flood the target system (fc00:1::1) with UDP datagrams at a rate of one packet per second. Each UDP
datagram will contain (in the payload) the string specified via the "--data" option.
Example #4
# udp6 -i eth0 -d fc00:1::1 -a 80 -L -s fc00:1::/112 -l -r 1000pps --udp-flags auto -v --data "GET /
HTTP/1.0\r\n\r\n" --flood-ports 10 --window-mode close
Flood the target node (fc00:1::1) with UDP connections (on port 80). On each connection that is
established, an HTTP request is sent, and the UDP window is immediately closed. For each forged IPv6
source address ten different UDP source ports are randomized. The bandwidth of the attack is limited to
1000 pps.
Example #5
# udp6 -d fc00:1::1 -a 80 --udp-flags A --dst-opt-hdr 8 --payload-size 50 --probe-mode script
Send a probe UDP datagram to UDP port 80 at fc00:1::1. The probe packet consists of an IPv6 packet with a
Destination Options header of 8 bytes, and an IPv6 payload consisting of a UDP datagram with the ACK bit
set, and 50 data bytes. The probe mode is "script".
AUTHOR
The udp6 tool and the corresponding manual pages were produced by Fernando Gont <fgont@si6networks.com>
for SI6 Networks <http://www.si6networks.com>.
COPYRIGHT
Copyright (c) 2011-2013 Fernando Gont.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free
Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with
no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is available
at <http://www.gnu.org/licenses/fdl.html>.
UDP6(1)