Internet DRAFT - draft-yeh-radext-ext-traffic-statistics
draft-yeh-radext-ext-traffic-statistics
Radext Working Group L. Yeh
Internet-Draft Huawei Technologies
Intended status: Standards Track M. Boucadair
Expires: April 18, 2013 France Telecom
October 15, 2012
RADIUS Accounting Extensions for Traffic Statistics
draft-yeh-radext-ext-traffic-statistics-04
Abstract
This document specifies the RADIUS extensions of attributes for the
traffic statistics with different type, which can be used to support
the differentiated accounting policies and traffic recording on the
AAA server.
Status of this Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology and Conventions . . . . . . . . . . . . . . . . . 4
3. Deployment Scenarios . . . . . . . . . . . . . . . . . . . . . 4
4. Acct-Traffic-Statistics attribute . . . . . . . . . . . . . . 4
4.1. Container attribute of Acct-Traffic-Statistics . . . . . . 5
4.2. Contained attribute of Acct-Traffic-Statistics . . . . . . 6
4.2.1. Acct-Traffic-Statistics.Stack-Type . . . . . . . . . . 6
4.2.2. Acct-Traffic-Statistics.Input-Octets . . . . . . . . . 7
4.2.3. Acct-Traffic-Statistics.Output-Octets . . . . . . . . 7
4.2.4. Acct-Traffic-Statistics.Input-Packets . . . . . . . . 8
4.2.5. Acct-Traffic-Statistics.Output-Packets . . . . . . . . 9
4.2.6. Acct-Traffic-Statistics.DSCP-Type . . . . . . . . . . 10
5. Table of Attribute . . . . . . . . . . . . . . . . . . . . . . 10
6. Diameter Considerations . . . . . . . . . . . . . . . . . . . 11
7. Security Considerations . . . . . . . . . . . . . . . . . . . 11
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 11
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
10.1. Normative References . . . . . . . . . . . . . . . . . . . 12
10.2. Informative References . . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13
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1. Introduction
RADIUS has been widely used as the centralized authentication,
authorization and subscriber management method for the service
provision in Broadband access network. [RFC3162], [RFC4818] and
[I-D.ietf-radext-ipv6-access] have specified some attributes to
support the service provision for IPv6 access. In the meantime,
RADIUS is also a protocol for carrying accounting information between
a Network Access Server (NAS) and a shared accounting server. In the
scenarios of dual-stack or any other IPv6 migration technologies,
there is a demand to report the separated IPv4 & IPv6 traffic
statistics for the differential accounting and traffic recording.
[BBF TR-187], whose purpose is to describe the network architecture
and elements requirements in the PPPoE scenario to support IPv6-only
or dual-stack for Internet access service, has explicitly expressed
in its Section 9.4, that the BNG must be able to support separate
queues, input and output counters for IPv4 or IPv6 traffic. Note
that BNG of BBF is a kind of broadband NAS of IETF. Meanwhile [BBF
TR-187] suggested to use the RADIUS attributes (eg. Acct-Input-
Octets (42), Acct-Output-Octets (43), Acct-Input-Packets (47), Acct-
Output-Packets (48)) for the combination of IPv6 and IPv4 traffic.
That means the new RADIUS attributes for reporting the separated IPv4
or IPv6 traffic statistics are required to be defined.
[I-D.hu-v6ops-radius-issues-ipv6-00] presented the same issue on
'protocol specific accounting' for the dual-stack traffic statistics,
but it also limits to the PPP case.
[I-D.maglione-radext-ipv6-acct-extensions-01] and
[I-D.yeh-radext-dual-stack-access-02] tried to defined a batch of
attributes on the traffic statistics respectively for the IPv6-only
access and dual-stack access in the traditional type space with the
flat mode , while [I-D.winter-radext-fancyaccounting] indicated that
the accounting attributes of Input-Octets, Output-Octets, Input-
Packets and Output-Packets can be grouped in the new basic data type
of TLV-nesting defined in Section 2.3 of
[I-D.ietf-radext-radius-extensions] for the extended type space.
According to [RFC6158] and Section 6.3 of
[I-D.ietf-radext-radius-extensions], Nesting-TLV is the only
recommendation for the new attribute design which intends to employ
multiple fields in the complex data type now. Based on the judge of
the quickly-exhausted traditional type space, the Radext Working
Group tends to adopt the new data type of nesting-TLV defined for the
extended type space to report the traffic statistics for the
accounting extension.
This document specifies new attributes of the traffic statistics with
different types for the extension of RADIUS accounting to support the
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differentiated accounting policies and traffic recording on the AAA
server. The reporting traffic types include the combination of stack
types and the optional DSCP types.
Note: This document tries to narrow the scope of the solution space
just to meet the requirements explicitly expressed by the industry
without defining new RADIUS messages or introducing a new namespace
for the additional interoperability.
2. Terminology and Conventions
Definitions for terms and acronyms not specifically defined in this
document are defined in [RFC2865], [RFC2866], [RFC2869], [RFC3575],
[RFC6158], and [I-D.ietf-radext-radius-extensions].
The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this
document, are to be interpreted as described in BCP 14, [RFC2119].
3. Deployment Scenarios
Figure 1 shows the typical use case of the traffic statistics
reporting for the dual-stack users.
+----------+ +----------+ +----------+
| Host / | PPPoE | | RADIUS | AAA |
| Customer | ------------ | NAS | ------------ | Server |
| Router | IPoE | | Accounting | |
+----------+ +----------+ +----------+
Dual-Stack Separated queues and counter
for IPv4 and IPv6 traffic
Figure 1: Traffic Statistics of Dual-Stack Users for RADIUS
Accounting
Note that traffic statistics reporting is also needed in the IPv6
transition cases, such as DS-Lite, 6rd or MAP, where AFTR (Address
Family Transition Router) or BR (Border Router) may act as the
broadband NAS.
4. Acct-Traffic-Statistics attribute
Acct-traffic-statistics attribute is designed according to the
guidelines described in [RFC6158] and Section 6 of
[I-D.ietf-radext-radius-extensions]. It adopts the data structure of
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the TLV nesting, has 1 container attribute, Acct-Traffic-Statistics,
and 6 contained sub-attributes, Stack-Type, Input-Octets, Output-
Octets, Input-Packets, Output-Packets, DSCP-Type (Differentiated
Services CodePoint), and possible support the extensible types of
traffic statistics in the future. The sub-attribute of Stack-Type
MUST be included, one or more sub-attribute of Input-Octets, Output-
Octets, Input-Packets or Output-Packets sub-attributes MUST be
included and sub-attribute of DSCP-Type MAY be included in the
container attribute, Acct-Traffic-Statistics. Because each of the
sub-attributes has its own type code, the appearance of the contained
sub-attributes is not necessary in a fixed order.
4.1. Container attribute of Acct-Traffic-Statistics
Description
The container attribute of Acct-Traffic-Statistics, which includes
sub-attributes of Stack-Type, or DSCP-Type, and Input-Octets,
Output-Octets, Input-Packets or Output-Packets, reports how many
octets or packets of the specified traffic type, from the user or
sent to the user, from the starting of the associated service
provided. The sub-attributes of Stack-Type or DSCP-Type indicates
the specified traffic type. One or more Acct-traffic-statistics
attribute can be presented in Accounting-Request(4) message while
the Acct-Status-Type(40) is set to Interim-Update or Stop.
The format of Acct-Traffic-Statistics attribute format is shown as
below. The fields are transmitted from left to right.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Extended-Type | Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value (cont.)...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type
241, which indicates the extended type space.
Length
The length of the whole attribute in octet.
Extended-Type
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TBA for Acct-Traffic-Statistics (See Section 8)
Value
The Value of the container attribute are the sub-attributes
defined in Section 4.2 in TLV nesting mode. At least the sub-
attribute of Stack-Type, and one of Input-Octets, Output-Octets,
Input-Packets or Output-Packets sub-attributes MUST be included.
4.2. Contained attribute of Acct-Traffic-Statistics
4.2.1. Acct-Traffic-Statistics.Stack-Type
Description
Acct-Traffic-Statistics.Stack-Type sub-attribute indicates the
type of the separated and combined traffic for IPv4 and IPv6.
The format of Acct-Traffic-Statistics.Stack-Type sub-attribute is
shown as below. The fields are transmitted from left to right.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type
TBA.1 for Acct-Traffic-Statistics.Stack-Type (See Section 8)
Length
6
Value
Enumerated Data Type in 4-Octet unsigned integer defined in
[RFC6158]. The beginning 3 Octets are reserved for future use,
and are set to 0x00 now. The decimal value of the last octet is
defined as follows:
0 Combined traffic of IPv4 and IPv6
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1 IPv4-only traffic
2 IPv6-only traffic
4.2.2. Acct-Traffic-Statistics.Input-Octets
Description
Acct-Traffic-Statistics.Input-Octets sub-attribute indicates how
many octets in IP layer received from the user (or subscriber
device) from the starting of the service authorized.
The format of Acct-Traffic-Statistics.Input-Octets sub-attribute
is shown as below. The fields are transmitted from left to right.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type
TBA.2 for Acct-Traffic-Statistics.Input-Octets (See Section 8)
Length
10
Value
Integer64 data type in 8-Octet unsigned integer defined in
[I-D.ietf-radext-radius-extensions].
4.2.3. Acct-Traffic-Statistics.Output-Octets
Description
Acct-Traffic-Statistics.Output-Octets sub-attribute indicates how
many octets in IP layer forwarded to the user (or subscriber
device) from the starting of the service authorized.
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The format of Acct-Traffic-Statistics.Output-Octets sub-attribute
is shown as below. The fields are transmitted from left to right.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type
TBA.3 for Acct-Traffic-Statistics.Output-Octets (See Section 8)
Length
10
Value
Integer64 data type in 8-Octet unsigned integer defined in
[I-D.ietf-radext-radius-extensions].
4.2.4. Acct-Traffic-Statistics.Input-Packets
Description
Acct-Traffic-Statistics.Input-Packets sub-attribute indicates how
many packets in IP layer received from the user (or subscriber
device) from the starting of the service authorized.
The format of Acct-Traffic-Statistics.Input-Packets sub-attribute
is shown as below. The fields are transmitted from left to right.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Type
TBA.4 for Acct-Traffic-Statistics.Input-Packets (See Section 8)
Length
10
Value
Integer64 data type in 8-Octet unsigned integer defined in
[I-D.ietf-radext-radius-extensions].
4.2.5. Acct-Traffic-Statistics.Output-Packets
Description
Acct-Traffic-Statistics.Input-Packets sub-attribute indicates how
many packets in IP layer forwarded to the user (or subscriber
device) from the starting of the service authorized.
The format of Acct-Traffic-Statistics.Output-Packets sub-attribute
is shown as below. The fields are transmitted from left to right.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type
TBA.5 for Acct-Traffic-Statistics.Output-Packets (See Section 8)
Length
10
Value
Integer64 data type in 8-Octet unsigned integer defined in
[I-D.ietf-radext-radius-extensions].
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4.2.6. Acct-Traffic-Statistics.DSCP-Type
Description
Acct-Traffic-Statistics.DSCP-Type sub-attribute indicates the DSCP
type of the separated or combined IPv4 and IPv6 traffic.
The format of Acct-Traffic-Statistics.DSCP-Type sub-attribute is
shown as below. The fields are transmitted from left to right.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type
TBA.6 for Acct-Traffic-Statistics.DSCP-Type (See Section 8)
Length
6
Value
Enumerated Data Type in 4-Octet unsigned integer defined in
[RFC6158]. The beginning 3 Octets are reserved for future use,
and are set to 0x00 now. The first 2 bits of the last octet are
reserved for future use, and are set to 00 now. The last 6 bits
of the last octet is used to contain the DSCP value as per
[RFC2474].
5. Table of Attribute
The following table provides a guide to which attributes may be found
in which kinds of packets, and in what quantity.
Req- Acc- Rej- Chall Accounting # Attribute
uest ept ect -enge Request
0 0 0 0 0+ TBA Acct-Traffic-Statistics
The meaning of the above table entries is as follows:
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0 This attribute MUST NOT be present.
0+ Zero or more instances of this attribute MAY be present.
0-1 Zero or one instance of this attribute MAY be present.
1 Exactly one instance of this attribute MUST be present.
1+ One or more of these attributes MUST be present.
6. Diameter Considerations
Given that the Attributes defined in this document are allocated from
the RADIUS extended type space (see Section 8), no special handling
is required by Diameter entities.
7. Security Considerations
Security issues related RADIUS are described in Section 8 of
[RFC2865] and Section 5 of [RFC3162].
8. IANA Considerations
The authors of this document request to assign new Radius type codes
for Acct-Traffic-Statistics and its following sub-attributes.
Acct-Traffic-Statistics.Stack-Type
Acct-Traffic-Statistics.Input-Octets
Acct-Traffic-Statistics.Output-Octets
Acct-Traffic-Statistics.Input-Packets
Acct-Traffic-Statistics.Output-Packets
Acct-Traffic-Statistics.DSCP-Type
These type codes should be allocated from the RADIUS extended type
space based on Section 10 of [I-D.ietf-radext-radius-extensions] and
"IETF Review" policy [RFC5226].
9. Acknowledgements
Thanks to Roberta Maglione, Jie Hu for their efforts in the history
to bring this problem to IETF, to Stefan Winter, Alan DeKok, Peter
Deacon for their valuable comments in the mailing list of Radext.
10. References
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10.1. Normative References
[I-D.ietf-radext-radius-extensions]
DeKok, A. and A. Lior, "Remote Authentication Dial In User
Service (RADIUS) Protocol Extensions",
draft-ietf-radext-radius-extensions-06 (work in progress),
June 2012.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2474] Nichols, K., Blake, S., Baker, F., and D. Black,
"Definition of the Differentiated Services Field (DS
Field) in the IPv4 and IPv6 Headers", RFC 2474,
December 1998.
[RFC2865] Rigney, C., Willens, S., Rubens, A., and W. Simpson,
"Remote Authentication Dial In User Service (RADIUS)",
RFC 2865, June 2000.
[RFC2866] Rigney, C., "RADIUS Accounting", RFC 2866, June 2000.
[RFC2869] Rigney, C., Willats, W., and P. Calhoun, "RADIUS
Extensions", RFC 2869, June 2000.
[RFC3162] Aboba, B., Zorn, G., and D. Mitton, "RADIUS and IPv6",
RFC 3162, August 2001.
[RFC3575] Aboba, B., "IANA Considerations for RADIUS (Remote
Authentication Dial In User Service)", RFC 3575,
July 2003.
[RFC4818] Salowey, J. and R. Droms, "RADIUS Delegated-IPv6-Prefix
Attribute", RFC 4818, April 2007.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
May 2008.
[RFC6158] DeKok, A. and G. Weber, "RADIUS Design Guidelines",
BCP 158, RFC 6158, March 2011.
10.2. Informative References
[BBF TR-187]
Broadband Forum, "IPv6 for PPP Broadband Access, Issue 1",
May 2010.
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[I-D.hu-v6ops-radius-issues-ipv6-00]
Hu, J., Yan, L., Wang, Q., and J. Qin, "RADIUS issues in
IPv6 deployments", February 2011.
[I-D.ietf-radext-ipv6-access]
Dec, W., Sarikaya, B., Zorn, G., Miles, D., and B.
Lourdelet, "RADIUS attributes for IPv6 Access Networks",
draft-ietf-radext-ipv6-access-11 (work in progress),
August 2012.
[I-D.maglione-radext-ipv6-acct-extensions-01]
Maglione, R., Krishnan, S., Kavanagh, A., Varga, B., and
J. Kaippallimalil, "RADIUS Accounting Extensions for
IPv6", January 2011.
[I-D.winter-radext-fancyaccounting]
Winter, S., "RADIUS Accounting for traffic classes",
draft-winter-radext-fancyaccounting-02 (work in progress),
July 2012.
[I-D.yeh-radext-dual-stack-access-02]
Yeh, L. and T. Tsou, "RADIUS Attributes for Dual Stack
Access", March 2011.
Authors' Addresses
Leaf Y. Yeh
Huawei Technologies
Shenzhen
P. R. China
Email: leaf.y.yeh@huawei.com
Mohamed Boucadair
France Telecom
Rennes,
France
Email: mohamed.boucadair@orange.com
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