Communication Protocol Between the AD Control Server and the AD Edge Router of Inter-Domain Source Address Validation Architecture
draft-xu-savax-protocol-04
The information below is for an old version of the document.
| Document | Type |
This is an older version of an Internet-Draft whose latest revision state is "Active".
|
|
|---|---|---|---|
| Authors | Ke Xu , Jianping Wu , Xiaoliang Wang , Yangfei Guo | ||
| Last updated | 2023-05-22 (Latest revision 2022-11-20) | ||
| RFC stream | (None) | ||
| Formats | |||
| Stream | Stream state | (No stream defined) | |
| Consensus boilerplate | Unknown | ||
| RFC Editor Note | (None) | ||
| IESG | IESG state | I-D Exists | |
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| Responsible AD | (None) | ||
| Send notices to | (None) |
draft-xu-savax-protocol-04
Network Working Group K. Xu
Internet-Draft J. Wu
Intended status: Standards Track X. Wang
Expires: 23 November 2023 Tsinghua University
Y. Guo
ZGC Lab
22 May 2023
Communication Protocol Between the AD Control Server and the AD Edge
Router of Inter-Domain Source Address Validation Architecture
draft-xu-savax-protocol-04
Abstract
Because the Internet forwards packets according to the IP destination
address, packet forwarding typically takes place without inspection
of the source address and malicious attacks have been launched using
spoofed source addresses. The inter-domain source address validation
architecture is an effort to enhance the Internet by using state
machine to generate consistent tags. When communicating between two
end hosts at different ADs of IPv6 network, tags will be added to the
packets to identify the authenticity of the IPv6 source address.
This memo focus on the data plane of the SAVA-X mechanism.
Discussion Venues
This note is to be removed before publishing as an RFC.
Source for this draft and an issue tracker can be found at
https://github.com/BasilGuo/savax-protocol.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
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This Internet-Draft will expire on 23 November 2023.
Copyright Notice
Copyright (c) 2023 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. Code Components
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provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions and Definitions . . . . . . . . . . . . . . . . . 3
2.1. Terminology and Abbreviation . . . . . . . . . . . . . . 4
3. Communication Protocol Format . . . . . . . . . . . . . . . . 4
4. ACS-ACS Communication Protocol . . . . . . . . . . . . . . . 7
4.1. Announcement, Query and Response of State Machine
Information . . . . . . . . . . . . . . . . . . . . . . . 7
4.1.1. State Machine Information Announcement . . . . . . . 9
4.1.2. State Machine Information Request . . . . . . . . . . 11
4.2. Request and Response of Diagnose Information . . . . . . 13
5. ACS-AER Communication Protocol . . . . . . . . . . . . . . . 16
5.1. Deployment, Request and Response of AD Registration
information . . . . . . . . . . . . . . . . . . . . . . . 16
5.1.1. Deployment of AD Registration Information . . . . . . 16
5.1.2. Request of AD Registration Information . . . . . . . 18
5.1.3. Reponse of AD Registration Information . . . . . . . 19
5.2. Deployment, Request and Reply of AD Prefix Information . 22
5.2.1. Deployment of AD Prefix Information . . . . . . . . . 22
5.2.2. Request of AD Prefix Information . . . . . . . . . . 25
5.2.3. Response of AD Prefix Information . . . . . . . . . . 27
5.3. Deployment, Request and Response of State Machine
Information . . . . . . . . . . . . . . . . . . . . . . . 30
5.3.1. Deployment of State Machine Information . . . . . . . 30
5.3.2. Request of State Machine Information . . . . . . . . 33
5.3.3. Response of State Machine Information . . . . . . . . 35
5.4. Request and Response of Keep-alive Information . . . . . 37
5.4.1. Request of Keep-alive Information . . . . . . . . . . 38
5.4.2. Response of Keep-alive Information . . . . . . . . . 39
6. Deployment of Tag Information . . . . . . . . . . . . . . . . 40
7. Security Considerations . . . . . . . . . . . . . . . . . . . 41
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8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 41
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 42
9.1. Normative References . . . . . . . . . . . . . . . . . . 42
9.2. Informative References . . . . . . . . . . . . . . . . . 42
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 42
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 42
1. Introduction
The Inter-Domain Source Address Validation (SAVA-X) mechanism
establishes a trust alliance among Address Domains (AD), maintains a
one-to-one state machine among ADs, generates a consistent tag, and
deploys the tag to the ADs' border router (AER). The AER of the
source AD adds a tag to identify the identity of the AD to the packet
originating from one AD and sinking in another AD. The AER of the
destination AD verifies the source address by validating the
correctness of the tag to determine whether it is a packet with a
forged source address.
In the process of packet forwarding, if the source address and the
destination address of this packet both are addresses in the trust
alliance, however the tag is not added or incorrectly added, AER of
the destination AD determines that the source address is forged and
directly discards this packet. The destination AD forwards the
packet directly for packets whose source address is an address
outside the trust alliance.
This document mainly studies the relevant specifications of the data
plane of the inter-domain source address validation architecture
mechanism between ADs, which will protect IPv6 networks from being
forged source address. You could see [RFC8200] for more details
about IPv6. It stipulates the state machine, tag generation and
update, tag processing in AER, and packet signature Its promotion and
application can realize the standardization of the data plane in the
SAVA-X to facilitate the related equipment developed by different
manufacturers and organizations to cooperate to accomplish the inter-
domain source address validation jointly.
2. Conventions and Definitions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
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2.1. Terminology and Abbreviation
+==============+====================================================+
| Abbreviation | Description |
+==============+====================================================+
| AD | Address Domain, the unit of a trust |
| | alliance, which is an address set |
| | consisting of all IPv6 addresses |
| | corresponding to an IPv6 address prefix. |
+--------------+----------------------------------------------------+
| TA | Trust Alliance, the IPv6 network that |
| | uses the SAVA-X mechanism. |
+--------------+----------------------------------------------------+
| ACS | AD Control Server, the server that |
| | matains state machine with other ACS and |
| | distribute information to AER. |
+--------------+----------------------------------------------------+
| AER | AD border router, which is placed at the |
| | boundary of an AD of STA. |
+--------------+----------------------------------------------------+
| ADID | The identity of an AD. |
+--------------+----------------------------------------------------+
| ADID_Rec | The record of a number of an AD. |
+--------------+----------------------------------------------------+
| ARI_Rec | The record with relavent information of |
| | an AD or STA. |
+--------------+----------------------------------------------------+
| API_Rec | The record of prefix of an AD or STA. |
+--------------+----------------------------------------------------+
| SM | State Machine, which is maintained by a |
| | pair of ACS to generate tags. |
+--------------+----------------------------------------------------+
| SMI_Rec | The record of the state machine |
| | information. |
+--------------+----------------------------------------------------+
| Tag | The authentic identification of source |
| | address of a packet. |
+--------------+----------------------------------------------------+
Table 1
3. Communication Protocol Format
Every AD should be placed at least one ACS, which is mainly
responsible for maintaining the relationship between ADs of the trust
alliance, establishing connections with other ACS, maintaining the
synchronous state machine, and sending the generated tags to the AER.
TCP is used for communicating between ACS-ACS and ACS-AER.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Alliance | I Type| S Type| Operation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Total Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Number of Records |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Transaction Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Acknowledgement Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Data ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: General communication packet format.
Version: 8-bit, the current version=0b1 of SAVA-X.
Alliance: 8-bit, the sub-trust alliance number.
I Type: 4-bit, Information type, 0 for G_REF_INFO, 1 for
AD_REG_INFO, 2 for AD_PREFIX_INFO, 3 for STATE_MACHINE_INFO, 4 for
DIAGNOSIS_INFO, 5 for RUNNING_STATE_INFO, 6 for STRATEGY_INFO, 7
for ALIVE_INFO, 8 for TAG_INFO, 9 for ALLI_TAG_INFO, 10 for
AD_V_TAG_INFO and others are unassigned.
S Type: 4-bit, Session type, 1 for ANNOUNCEMENT or DEPLOYMENT, 2 for
REQUEST, 3 for REQUEST_ALL, 4 for ACK, 5 for NAK, 6 for AACK, 7
for ANAK, 8 for RACK, 9 for RNAK and others are unassigned.
Operation: 8-bit, the first 3 bits means for whether RENEW Type or
not. First bit: 0 for non-RENEW packet, 1 for RENEW packet.
Second bit: 0 for the first non-RENEW packet, 1 for the first
RENEW packet. Third bit: 0 for the last non-RENEW packet, 1 for
the last RENEW packet.
Total Length: 32-bit, the length of this packet: from Version to
Data.
Number of Records: 32-bit, he records in Data.
Transaction Number: 32-bit, this is the identification of a
publication, query or response, and the value should increase
monotonically. And different I Types MUST have its own
Transaction Number. Through this field, ACS can locate which
information has been resolved wrongly and corrected it.
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Acknowledgement Number: 32-bit, it is only be filled when S Type is
ACK, NAK, AACK, ANAK, RACK or RNAK. Otherwise it is should be
filled as 0.
Data: Variable-length field. I Type and S Type specifies data
jointly.
When S Type is ANNOUNCEMENT:
* If I Type = AD_REG_INFO, Data field SHOULD be one or more ARI_Rec.
* If I Type = AD_PREFIX_INFO, Data field SHOULD be one or more
API_Rec.
* If I Type = STATE_MACHINE_INFO, Data field SHOULD be one or more
SMI_Rec.
* If I Type = TAG_INFO, ALLI_TAG_INFO or AD_V_TAG_INFO, Data field
SHOULD be one or more TAG_Rec.
When S Type is REQUEST or REQUEST_ALL:
* If I Type = REG_INFO, Data field SHOULD be one or more ADID_Rec.
* If I Type = AD_PREFIX_INFO, Data field SHOULD be none or one or
more ADID_Rec.
* If I Type = STATE_MACHINE_INFO, Data field SHOULD be none or one
or more ADID_Rec.
* If I Type = DIAGNOSE_INFO, Data field SHOULD be a 32-bit diagnose
reqeust code.
* If I Type = ALIVE_INFO, Data field SHOULD be none.
When S Type is ACK, AACK or RACK:
* If I Type = REG_INFO, Data field SHOULD be one or more ARI_Rec.
* If I Type = AD_PREFIX_INFO, Data field SHOULD be one or more
API_Rec.
* If I Type = STATE_MACHINE_INFO, Data field SHOULD be one or more
SMI_Rec.
* If I Type = DIAGNOSE_INFO, Data field SHOULD be one 32-bit
diagnose response code.
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* If I Type = ALIVE_INFO, Data field SHOULD be none.
When S Type is NAK, ANAK or RNAK, Data field SHOULD be one 32-bit
error code:
* 1 for parameters are wrong which means the packet cannot resolve
correctly.
* 2 for member AD(s) in request packet does not exist in the
designative sub-trust alliance.
* 3 for algorithm for State Machine set by source ACS cannot support
by the destination ACS.
4. ACS-ACS Communication Protocol
Since the blockchain is adopted in SAVA-X to maintain the information
of the trust alliance, ACS can query the address domain information
of relevant ADes of the trust alliance and the AD prefix information
corresponding to the address domain from the blockchain.
4.1. Announcement, Query and Response of State Machine Information
State machine information record (SMI_Rec) represents the packet
format used when state machine is negotiated between different
ordered pairs of ADs. When an ordered pair of ADs is negotiating the
state machine, ACS of AD with smaller ADID initiates the
communication and ACS of AD with larger ADID uses SMI_Rec determines
the information to be used, such as initial state, tag generation
algorithm, state transition interval, etc. Compared to ARI_Rec and
API_Rec,SMI_Rec also needs an Expiring Time in addition to the
Effecting Time. Expiration Time stands when the negotiated state
machine is no longer valid.
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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
+-+-+-+-+-+-+-+-+
| Action |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source ADID_Rec |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination ADID_Rec |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| State Mathine ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Algorithm | IS Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Initial State ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Transition Interval |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Effecting Time |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Expiring Time |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: Format of state machine information record.
Action: 8-bit, 1 for add or update this SMI_Rec.
Source ADID_Rec: Variable-length field. Refer to ADID_Rec
[savax-control].
Destination ADID_Rec: Variable-length field. Refer to ADID_Rec in
[savax-control].
State Mathine ID: 32-bit, the ID used to identify the state machine,
which is unique to a specific ordered AD pair and grows
monotonically in use. It is used to distinguish the sequence
before and after the generation of multiple state machines.
Algorithm: 16-bit, algorithm used in A-Box. 1 for KISS-99 32-bit, 2
for KISS-99 64-bit Joint, 3 for OTP-2289 MD5 and others are
unassigned.
IS Length: 16-bit, the length of Initial State field.
Initial State: Variable-length field, the length of this filed is
determined by IS Length.
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Transition Interval: 32-bit, the milliseconds of interval of state
transition.
Effecting Time: 64-bit, when this field is 0, it means this State
Machine should be enabled after the last State Machine expired.
Expiring Time: 64-bit, the end of this State Machine.
4.1.1. State Machine Information Announcement
State machine information announcement (SM_INFO-Announce) is sent
from source ACS to destination ACS. Source ACS fills in the
following values for each field:
+=================+==============================================+
| Field | Value |
+=================+==============================================+
| Version | 1 |
+-----------------+----------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+----------------------------------------------+
| I Type | SM_INFO |
+-----------------+----------------------------------------------+
| S Type | ANNOUNCEMENT |
+-----------------+----------------------------------------------+
| Operation | NULL: source ACS updates part of the state |
| | machines information to destination ACS. |
| | RENEW: source ACS updates all the state |
| | machines information to destination ACS. |
+-----------------+----------------------------------------------+
| Total Length | The length of this message. |
+-----------------+----------------------------------------------+
| Number of | The number of SMI_Recs in Data field. |
| Records | |
+-----------------+----------------------------------------------+
| Transaction | The last Transaction Number add 1. ACS |
| Number | would maintain a global Transaction Number |
| | for packets sent out where I Type is SM_INFO |
| | and ACS would keep it increasing monotonic. |
+-----------------+----------------------------------------------+
| Acknowledgement | 0 |
| Number | |
+-----------------+----------------------------------------------+
| Data | One or more SMI_Recs. |
+-----------------+----------------------------------------------+
Table 2
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All SMI_Recs in Data field should have an unique SM_ID. When Action
is ADD and SM_ID bigger than current used SM_ID, ACS should add the
state machine defined in SMI_Rec. When Action is ADD and SM_ID
equals to current used SM_ID, ACS should modify the state machine
defined in SMI_Rec. Only Transition Interval and Expiring Time can
be modified. Other SMI_Rec should be discarded and destination ACS
should send a NAK message to source ACS.
When receiving a non-RENEW packet, if it cannot resolve this message,
destination ACS should send a NAK message to source ACS. When
destination ACS can resolve the packet correctly, it SHOULD:
1. Compare the Transaction Number in this packet with Transaction
Number received from the same ACS before. Otherwise, destination
ACS would discard this packet and send a SM_INFO-Request to
request the lastest information of state machine. SM_INFO-
Request is defined at Section 4.1.2. If bigger, destination ACS
WOULD:
2. Accept every SMI_Rec and process them as following: - If the
SM_ID in SMI_Rec equals to current used SM_ID, destination ACS
would update the current used SM_ID. - If the SM_ID in SMI_Rec
bigger than current used SM_ID, destination ACS would add this
state machine to its following used state machine list.
3. And then destination ACS will send an SM_INFO-AACK message to
source ACS.
When receiving a RENEW packet, if it cannot resolve this message,
destination ACS should send a SM_INFO-ANAK message to source ACS.
When destination ACS can resolve the packet correctly, it SHOULD:
1. Compare the Transaction Number in this packet with Transaction
Number received from the same ACS before. Otherwise, destination
ACS would discard this packet and send a SM_INFO-Request to
request the lastest information of state machine. If bigger,
destination ACS WOULD:
2. Accept every SMI_Rec and process them as following: - If the
SM_ID in SMI_Rec equals to current used SM_ID, destination ACS
would update the current used SM_ID. - If the SM_ID in SMI_Rec
bigger than current used SM_ID, destination ACS would add this
state machine to its following used state machine list.
Especially, state machines will be removed right now when they
are not listed in the SMI_Recs but they are in using.
3. And then destination ACS will send an SM_INFO-AACK message to
source ACS.
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There are two types of reply of SM_INFO-Annouce message. That is
SM_INFO-AACK representing affirmative acknowledgement and SM_INFO-
ANAK representing negative acknowledgement. These are sent from
destination ACS to source ACS. The mainly part of packet is filled
by destination ACS as follows:
+=================+==============================================+
| Field | Value |
+=================+==============================================+
| Version | 1 |
+-----------------+----------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+----------------------------------------------+
| I Type | SM_INFO |
+-----------------+----------------------------------------------+
| S Type | AACK if it is affirmative acknowledgement or |
| | ANAK if it is negative acknowledgement. |
+-----------------+----------------------------------------------+
| Operation | NULL |
+-----------------+----------------------------------------------+
| Total Length | The length of this message. |
+-----------------+----------------------------------------------+
| Number of | 0 |
| Records | |
+-----------------+----------------------------------------------+
| Transaction | The last Transaction Number add 1. ACS |
| Number | would maintain a global Transaction Number |
| | for packets sent out where I Type is SM_INFO |
| | and ACS would keep it increasing monotonic. |
+-----------------+----------------------------------------------+
| Acknowledgement | The Transaction Number of the response |
| Number | corresponding request. |
+-----------------+----------------------------------------------+
| Data | S Type = AACK: None. S Type = ANAK: a |
| | 32-bit error code defined in Section 3. |
+-----------------+----------------------------------------------+
Table 3
Nothing needs to do when source ACS receives an SM_INFO-AACK message
while it should regenerate a new state machine and announces to
destination ACS when source ACS receives an SM_INFO-ANAK message.
4.1.2. State Machine Information Request
State machine information request (SM_INFO-Request) is sent from
source ACS to destination ACS. Source ACS fills in the following
values for each field:
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+=================+==============================================+
| Field | Value |
+=================+==============================================+
| Version | 1 |
+-----------------+----------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+----------------------------------------------+
| I Type | SM_INFO |
+-----------------+----------------------------------------------+
| S Type | REQUEST |
+-----------------+----------------------------------------------+
| Operation | NULL: announce all state machine information |
| | to source ACS. |
+-----------------+----------------------------------------------+
| Total Length | The length of this message. |
+-----------------+----------------------------------------------+
| Number of | 0 |
| Records | |
+-----------------+----------------------------------------------+
| Transaction | The last Transaction Number add 1. ACS |
| Number | would maintain a global Transaction Number |
| | for packets sent out where I Type is SM_INFO |
| | and ACS would keep it increasing monotonic. |
+-----------------+----------------------------------------------+
| Acknowledgement | 0 |
| Number | |
+-----------------+----------------------------------------------+
| Data | None |
+-----------------+----------------------------------------------+
Table 4
When source ACS receives a SM_INFO-Request message, it would send a
SM_INFO-RNAK message to destination ACS if some fields are wrong.
Otherwise, source ACS would send an SM_INFO-RACK message to
destination ACS and process this SM_INFO-Request message. Source ACS
should compare the Transaction Number in this message with
Transaction Number received from the same destination ACS before.
Otherwise, source ACS would discard this packet. If bigger, source
ACS would send an SM_INFO-RACK message to destination ACS.
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There are two types of reply of SM_INFO-Request message, i.e.
SM_INFO-RACK representing affirmative acknowledgement and SM_INFO-
RNAK representing negative acknowledgement. These are sent from
source ACS to destination ACS. The mainly part of packet is filled
by source ACS as follows: I Type is SM_INFO. S Type is RACK if it is
affirmative acknowledgement or RNAK if it is negative
acknowledgement. Operation is NULL. When S Type is RACK, Data field
is a few of SMI_Recs. When S Type is RNAK, Data field is a 32-bit
error code.
When receiving a SM_INFO-RACK message, if it cannot resolve this
message, destination ACS should send a SM_INFO-Request message to
source ACS to acquire another state machine. When destination ACS
can resolve the message correctly, it SHOULD:
1. Compare the Transaction Number in this packet with Transaction
Number received from the same source ACS before. Otherwise,
destination ACS would discard this packet and send a SM_INFO-
Request to request the lastest information of state machine. If
bigger, destination ACS WOULD:
2. Accept every SMI_Rec and process them as following: - If the
SM_ID in SMI_Rec equals to current used SM_ID, destination ACS
would update the current used SM_ID. - If the SM_ID in SMI_Rec
bigger than current used SM_ID, destination ACS would add this
state machine to its following used state machine list.
3. And then destination ACS will send an SM_INFO-AACK message to
source ACS.
When receiving a SM_INFO-RNAK message, if it cannot resolve this
message, destination ACS should send a SM_INFO-Request message to
source ACS to acquire new state machine. When destination ACS can
resolve the message correctly, it SHOULD compare the Transaction
Number in this packet with Transaction Number received from the same
source ACS before. Otherwise, destination ACS would discard this
packet and send a SM_INFO-Request to request the lastest information
of state machine. If bigger, destination ACS WOULD send a new
correct SM_INFO-Request message to source ACS.
4.2. Request and Response of Diagnose Information
Sent by destination ACS, request of diagnose information (DIAG_INFO-
Request) is used to require the source ACS to check its configuration
and source AERs' settings. Source ACS will response with its result.
Destination ACS fills in the following values for each field:
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+=================+===============================================+
| Field | Value |
+=================+===============================================+
| Version | 1 |
+-----------------+-----------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+-----------------------------------------------+
| I Type | DIAG_INFO |
+-----------------+-----------------------------------------------+
| S Type | REQUEST |
+-----------------+-----------------------------------------------+
| Operation | NULL |
+-----------------+-----------------------------------------------+
| Total Length | The length of this message. |
+-----------------+-----------------------------------------------+
| Number of | 0 |
| Records | |
+-----------------+-----------------------------------------------+
| Transaction | The last Transaction Number add 1. ACS would |
| Number | maintain a global Transaction Number for |
| | packets sent out where I Type is DIAG_INFO |
| | and ACS would keep it increasing monotonic. |
+-----------------+-----------------------------------------------+
| Acknowledgement | 0 |
| Number | |
+-----------------+-----------------------------------------------+
| Data | a 32-bit error code defined below. |
+-----------------+-----------------------------------------------+
Table 5
Response of diagnose information (DIAG_INFO-Response) replys from
source ACS to destination ACS.
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+=================+===============================================+
| Field | Value |
+=================+===============================================+
| Version | 1 |
+-----------------+-----------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+-----------------------------------------------+
| I Type | DIAG_INFO |
+-----------------+-----------------------------------------------+
| S Type | ACK |
+-----------------+-----------------------------------------------+
| Operation | NULL |
+-----------------+-----------------------------------------------+
| Total Length | The length of this message. |
+-----------------+-----------------------------------------------+
| Number of | 0 |
| Records | |
+-----------------+-----------------------------------------------+
| Transaction | The last Transaction Number add 1. ACS would |
| Number | maintain a global Transaction Number for |
| | packets sent out where I Type is DIAG_INFO |
| | and ACS would keep it increasing monotonic. |
+-----------------+-----------------------------------------------+
| Acknowledgement | The Transaction Number of the response |
| Number | corresponding request. |
+-----------------+-----------------------------------------------+
| Data | a 32-bit error code defined below. |
+-----------------+-----------------------------------------------+
Table 6
Before it sends the DIAG_INFO-Request message, the destination ACS
should check its own configuration and gurantee they are correct.
If it receives a DIAG_INFO-Request message, the source ACS would
check the communication with its own AER whether correct or not.
1. If it's wrong, source ACS would reply a DIAG_INFO-Response
message in which its Data filed is filled with 2 for fault cannot
be repaired and alarm to administrator to deal with this problem.
2. If it's right, source ACS would RENEW all the registration
information, prefix information and state machine information to
its all AERs. After that, source ACS will reply a DIAG_INFO-
Response message in which its Data filed is filled with 1 for all
runs correctly after repairing.
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5. ACS-AER Communication Protocol
ACS would periodically deploy AD registration information, AD prefix
information, and state machine information of relevant ADes to its
all AERs to guarantee all information are latest. And ACS also would
deploy the tag information to its all AERs periodically.
5.1. Deployment, Request and Response of AD Registration information
5.1.1. Deployment of AD Registration Information
After connecting with AER, ACS deploys the AD Registration
Information (REG_INFO-Deploy) to AER peroidically. I Type is
REG_INFO. S Type is Announcement. Operation is NULL when some ADes'
information are joined, left or updated and Operation is RENEW when
all ADes' information are deployed. Acknowledgement is 0. Data
field is one or more ARI_Rec.
It should be noted that when there are two ARI_Recs in Data fields
responding to the same AD, one may effect right now and the other
effects after passing Effecting Time. When AER receives this
message, all of them should be restored in the trust alliance list
and AER MUST process them orderly. Since the protocol processes the
records in sequence, it is required that the ARI_Rec effecting at the
current time for the same member AD should appear in front of another
updating ARI_Rec.
When receiving a non-RENEW packet, if it cannot resolve this message,
AER could send a REG_INFO-Request message to acquire the latest AD
registration information.
When AER can resolve this message correctly, it SHOULD:
1. Compare the Transaction Number in this packet with Transaction
Number received from the same ACS before. If bigger, AER WOULD
accept every ARI_Rec and process them as follows. Otherwise, AER
would discard this packet and send a REG_INFO-RequestAll message
to acquire the lastest information of AD registration
information.
2. Process every ARI_Rec: - If Action is ADD and the record does not
exist in its maintained trust alliance list, AER would add this
record to its trust alliance list. - If Action is ADD and the
record exists in its maintained trust alliance list but ACS
Address is changed, AER would add this record to its trust
alliance list and delete original record after passing Effecting
Time in this ARI_Rec. - If Action is ADD and the record exists
in its maintained trust alliance list and ACS Address is not
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changed, AER would do nothing. - If Action is DEL and the record
exists in its maintained trust alliance list, AER would remove
this record from its trust alliance list after passing Effecting
Time in this ARI_Rec.
3. If a change is made in step 2, the update should take effect
after passing the Effecting Time, which acts on the data plane.
If the Effecting Time is earlier than the current time or is all
0, it will take effect immediately.
AER acts as following when receiving a RENEW packet. When ACS
initiates RENEW, it would send a RENEW meesge with which the first
bit of Operation field is 1. The second bit of Operation field
identifies the begin of a procedure of RENEW and the third bit of
Operation field identifies the end of a procedure of RENEW. ACS MUST
NOT send a RENEW packet with which the first bit of Operation field
is 0 in RENEWing. AER MUST process this procedure of RENEW after
received all RENEW packets.
When AER can resolve this packet correctly, it SHOULD:
1. Compare the Transaction Number in this packet with Transaction
Number received from the same ACS before. If bigger, AER would
accept every ARI_Rec and process them as follows. Otherwise, AER
would discard this packet and send a REG_INFO-RequestAll message
to acquire the lastest information of AD registration
information.
2. Process every ARI_Rec: - If the record does not exist in its
maintained trust alliance list, AER would add this record to its
trust alliance list. - If the record exists in its maintained
trust alliance list but ACS Address is changed, AER would add
this record to its trust alliance list and delete original record
after passing Effecting Time in this ARI_Rec. - If the record
exists in its maintained trust alliance list and ACS Address is
not changed, AER would do nothing. - If there are some records in
the original trust alliance list that do not appear in the Data
field during this RENEW process, they will be deleted
immediately.
3. If a change is made in step 2, the update should take effect
after passing the Effecting Time, which acts on the data plane.
If the Effecting Time is earlier than the current time or is all
0, it will take effect immediately.
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5.1.2. Request of AD Registration Information
The request is sent by AER to ACS. There are two types of request of
AD Registration Information message. When querying the information
of all member ADs of the trust alliance, the type is REG_INFO-
RequestAll and REG_INFO-Request is used when querying the information
of partial member ADs of the trust alliance.
+=================+=========================================+
| Field | Value |
+=================+=========================================+
| Version | 1 |
+-----------------+-----------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+-----------------------------------------+
| I Type | REG_INFO |
+-----------------+-----------------------------------------+
| S Type | REQUEST: for querying partial member |
| | ADs and S Type is REQUEST_ALL: for |
| | querying all member ADs. |
+-----------------+-----------------------------------------+
| Operation | NULL |
+-----------------+-----------------------------------------+
| Total Length | The length of this message. |
+-----------------+-----------------------------------------+
| Number of | S Type = REQUEST: the number of |
| Records | ADID_Recs in Data field. S Type = |
| | REQUEST_ALL: 0. |
+-----------------+-----------------------------------------+
| Transaction | The last Transaction Number add 1. AER |
| Number | would maintain a global Transaction |
| | Number for packets sent out to ACS |
| | where I Type is REG_INFO and AER would |
| | keep it increasing monotonic. |
+-----------------+-----------------------------------------+
| Acknowledgement | 0 |
| Number | |
+-----------------+-----------------------------------------+
| Data | S Type = REQUEST: one or more |
| | ADID_Recs. S Type = REQUEST_ALL: None. |
+-----------------+-----------------------------------------+
Table 7
When processing REG_INFO-Request(ALL) message, ACS would reply
REG_INFO-NAK to AER if it holds some fields are wrong. For example,
AER requests one ARI_Rec that does not exist. Otherwise, REG_INFO-
ACK message will be replyed. ACS WOULD process as follows:
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1. ACS SHOULD compare the Transaction Number in this packet with
Transaction Number received from the same AER before. If bigger,
ACS would process as step 2. Otherwise, AER WOULD discard this
packet and send a REG_INFO-NAK message to AER.
2. ACS processes every ADID_Rec. If the AD exists in its maintained
trust alliance list, ACS would mark this record as "Reply".
Otherwise ACS would mark this record as "Negative Reply".
Especially, all records would be marked with "Reply" when
Operation field is REQUEST_ALL.
3. If any case in step 2 is marked with "Negative Reply", ACS would
construct a REG_INFO-NAK message to reply to the AER. Otherwise,
a REG_INFO-ACK message is constructed to reply the AD
registration information of all members marked with "Reply" to
the AER.
5.1.3. Reponse of AD Registration Information
AD registration information response includs two types. That is
REG_INFO-ACK and REG_INFO-NAK. ACS will reply to AER according to
the request of registration information sent by AER to ACS.
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+=================+=============================================+
| Field | Value |
+=================+=============================================+
| Version | 1 |
+-----------------+---------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+---------------------------------------------+
| I Type | REG_INFO |
+-----------------+---------------------------------------------+
| S Type | ACK: representing affirmative |
| | acknowledgement. NAK: representing |
| | negative acknowledgement. |
+-----------------+---------------------------------------------+
| Operation | NULL: REG_INFO-Request message. RENEW: |
| | REG_INFO-RequestAll. |
+-----------------+---------------------------------------------+
| Total Length | The length of this message. |
+-----------------+---------------------------------------------+
| Number of | S Type = ACK: the number of ARI_Recs in |
| Records | Data field. S Type = REQUEST_ALL: 0. |
+-----------------+---------------------------------------------+
| Transaction | The last Transaction Number add 1. ACS |
| Number | would maintain a global Transaction Number |
| | for packets sent out to AER where I Type is |
| | REG_INFO and ACS would keep it increasing |
| | monotonic. |
+-----------------+---------------------------------------------+
| Acknowledgement | The Transaction Number of the response |
| Number | corresponding request. |
+-----------------+---------------------------------------------+
| Data | S Type = ACK: one or more ARI_Recs. S Type |
| | = NAK: a 32-bit error code defined at |
| | Section 3. There is no boundary |
| | identification between these ARI_Recs, |
| | which requires that the implementation of |
| | the protocol can process each record |
| | sequentially until the end of this message. |
+-----------------+---------------------------------------------+
Table 8
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It should be noted that when there are two ARI_Recs in Data fields
responding to the same AD, one may effect right now and the other
effects after passing Effecting Time. When AER receives this
message, all of them should be restored in the trust alliance list
and AER MUST process them orderly. Since the protocol processes the
records in sequence, it is required that the ARI_Rec effecting at the
current time for the same member AD should appear in front of another
updating ARI_Rec.
When receiving a non-RENEW REG_INFO-ACK message, if it holds that
some fields are wrong, AER could send a REG_INFO-RequestAll message
to acquire the latest AD registration information. Otherwise, AER
would act as follows.
1. AER SHOULD compare the Transaction Number in this packet with
Transaction Number received from the same ACS before. If bigger,
AER would process them as follows. Otherwise, AER would discard
this packet and send a REG_INFO-RequestAll message to acquire the
lastest information of AD registration information.
2. AER WOULD processes every ARI_Rec: - If Action is ADD and the
record does not exist in its maintained trust alliance list, AER
would add this record to its trust alliance list. - If Action is
ADD and the record exists in its maintained trust alliance list
but ACS Address is changed, AER would add this record to its
trust alliance list and delete original record after passing
Effecting Time in this ARI_Rec. - If Action is ADD and the
record exists in its maintained trust alliance list and ACS
Address is not changed, AER would do nothing. - If Action is DEL
and the record exists in its maintained trust alliance list, AER
would remove this record from its trust alliance list after
passing Effecting Time in this ARI_Rec.
3. If a change is made in step 2, the update should take effect
after passing the Effecting Time, which acts on the data plane.
If the Effecting Time is earlier than the current time or is all
0, it will take effect immediately.
AER acts as following when receiving a RENEW REG_INFO-ACK message.
When ACS initiates RENEW, it would send a RENEW meesge with which the
first bit of Operation field is 1. The second bit of Operation field
identifies the begin of a procedure of RENEW and the third bit of
Operation field identifies the end of a procedure of RENEW. ACS MUST
NOT send a RENEW packet with which the first bit of Operation field
is 0 in RENEWing. AER MUST process this procedure of RENEW after
received all RENEW packets.
When AER can resolve this packet correctly, it SHOULD:
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1. Compare the Transaction Number in this packet with Transaction
Number received from the same ACS before. If bigger, AER would
accept every ARI_Rec and process them as step 2. Otherwise, AER
would discard this packet and send a REG_INFO-RequestAll message
to acquire the lastest information of AD registration
information.
2. Process every ARI_Rec: - If the record does not exist in its
maintained trust alliance list, AER would add this record to its
trust alliance list. - If the record exists in its maintained
trust alliance list but ACS Address is changed, AER would add
this record to its trust alliance list and delete original record
after passing Effecting Time in this ARI_Rec. - If the record
exists in its maintained trust alliance list and ACS Address is
not changed, AER would do nothing. -If there are some records in
the original trust alliance list that do not appear in the Data
field during this RENEW process, they will be deleted
immediately.
3. If a change is made in step 2, the update should take effect
after passing the Effecting Time, which acts on the data plane.
If the Effecting Time is earlier than the current time or is all
0, it will take effect immediately.
When AER receives an REG_INFO-NAK message, it could send a REG_INFO-
RequestAll message to ACS to acquire the latest AD registration
information.
5.2. Deployment, Request and Reply of AD Prefix Information
5.2.1. Deployment of AD Prefix Information
AD prefix information deployment (PFX_INFO-Deploy) is sent from ACS
to AER. ACS fills in the following values for each field:
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+=================+=============================================+
| Field | Value |
+=================+=============================================+
| Version | 1 |
+-----------------+---------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+---------------------------------------------+
| I Type | AD_PREFIX_INFO |
+-----------------+---------------------------------------------+
| S Type | DEPLOYMENT |
+-----------------+---------------------------------------------+
| Operation | NULL: to publish partial update information |
| | of member ADs' prefix. RENEW: to publish |
| | all member ADs' prefix. |
+-----------------+---------------------------------------------+
| Total Length | The length of this message. |
+-----------------+---------------------------------------------+
| Number of | The number of API_Recs in Data field. |
| Records | |
+-----------------+---------------------------------------------+
| Transaction | The last Transaction Number add 1. ACS |
| Number | would maintain a global Transaction Number |
| | for packets sent out to AER where I Type is |
| | AD_PREFIX_INFO and ACS would keep it |
| | increasing monotonic. |
+-----------------+---------------------------------------------+
| Acknowledgement | 0 |
| Number | |
+-----------------+---------------------------------------------+
| Data | One or more API_Recs. There is no boundary |
| | identification between these API_Recs, |
| | which requires that the implementation of |
| | the protocol can process each record |
| | sequentially until the end of this message. |
+-----------------+---------------------------------------------+
Table 9
It should be noted that when there are two ARI_Recs in Data fields
responding to the same AD, one may effect right now and the other is
update message for ADD or DEL effecting after the Effecting Time.
For example, if the current time is 5 and there are two records
corresponding to the prefix P, in which the Effecting Time of record
R1 is 1, the action is ADD, the Effecting Time of record R2 is 7 and
the action is DEL, then it indicates that the prefix P is currently
valid effective from time 1 and becomes invalid at time 7. When ACS
or AER receives this message, all of them should be restored in the
database and ACS should send them all when deploying. Since the
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protocol processes the records in sequence, it is required that the
API_Rec effecting at the current time for the same member AD should
appear in front of another updating API_Rec.
When receiving a non-RENEW PFX_INFO-Deploy message, if it holds that
some fields are wrong, for example, it requires to delete a API_Rec
that does not exist or to add some prefix that is conflict with other
member ADs, AER could send a request message to acquire the latest AD
prefix information. Otherwise, AER would act as follows.
1. AER SHOULD compare the Transaction Number in this packet with
Transaction Number received from the same ACS before. If bigger,
AER WOULD process them as step 2. Otherwise, AER would discard
this packet and send a PFX_INFO-RequestAll message to acquire the
lastest information of AD prefix information.
2. AER processes every API_Rec: - If Action is ADD and the record
does not exist in its maintained prefix list, AER would add this
record to its prefix list. - If Action is ADD and the record
exists in its maintained prefix list, AER would do nothing. - If
Action is DEL and the record exists in its maintained prefix
list, AER would remove this record from its prefix list after
Effecting Time.
3. If a change is made in step 2, the update should take effect
after the Effecting Time, which acts on the data plane. If the
Effecting Time is earlier than the current time or is all 0, it
will take effect immediately.
AER acts as following when receiving a RENEW PFX_INFO-Deploy message.
When ACS initiates RENEW, it would send a RENEW meesge with which the
first bit of Operation field is 1. The second bit of Operation field
identifies the begin of a procedure of RENEW and the third bit of
Operation field identifies the end of a procedure of RENEW. ACS MUST
NOT send a RENEW packet with which the first bit of Operation field
is 0 in RENEWing. AER SHOULD uniformly process all packets in this
RENEW process after receiving all RENEW packets.
1. AER SHOULD compare the Transaction Number in this packet with
Transaction Number received from the same ACS before. If bigger,
AER WOULD process as step 2. Otherwise, AER would discard this
message and send a PFX_INFO-RequestAll message to acquire the
lastest information of AD prefix information.
2. AER processes every API_Rec: - If the record does not exist in
its maintained prefix list, AER would add this record to its
trust alliance list. - If the record exists in its maintained
prefix list, AER would do nothing. - If there are some records
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in the original prefix list that do not appear in the Data field
during this RENEW process, these records will be deleted
immediately.
3. If a change is made in step 2, the update should take effect
after passing the Effecting Time, which acts on the data plane.
If the Effecting Time is earlier than the current time or is all
0, it will take effect immediately.
5.2.2. Request of AD Prefix Information
AD prefix information request (PFX_INFO-RequestAll) is sent from AER
to ACS to query some member ADs', including itself, all latest AD
prefix information.
AER fills in the following values for each field:
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+=================+=========================================+
| Field | Value |
+=================+=========================================+
| Version | 1 |
+-----------------+-----------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+-----------------------------------------+
| I Type | AD_PREFIX_INFO |
+-----------------+-----------------------------------------+
| S Type | REQUEST_ALL: querying from ACS the |
| | latest AD prefix information of all |
| | member ADs. |
+-----------------+-----------------------------------------+
| Operation | NULL |
+-----------------+-----------------------------------------+
| Total Length | The length of this message. |
+-----------------+-----------------------------------------+
| Number of | 0 |
| Records | |
+-----------------+-----------------------------------------+
| Transaction | The last Transaction Number add 1. AER |
| Number | would maintain a global Transaction |
| | Number for packets sent out to ACS |
| | where I Type is AD_PREFIX_INFO and AER |
| | would keep it increasing monotonic. |
+-----------------+-----------------------------------------+
| Acknowledgement | 0 |
| Number | |
+-----------------+-----------------------------------------+
| Data | None |
+-----------------+-----------------------------------------+
Table 10
When receiving a PFX_INFO-RequestAll message, if it holds that some
fields are wrong, ACS could send a PFX_INFO-NAK. Otherwise, ACS
would act as follows. The specific construction methods of PFX_INFO-
ACK and PFX_INFO-NAK are described in Section 5.2.3.
1. ACS SHOULD compare the Transaction Number in this packet with
Transaction Number whose I Type is PFX_INFO received from the
same AER before. If bigger, ACS WOULD process them as step 2.
Otherwise, ACS would discard this packet and send a PFX_INFO-NAK
message.
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2. ACS processes every ADID_Rec. If AD exists in the maintained
trust alliance list, ACS would mark this record as "Reply".
Otherwise, ACS wourld mark this rocord as "Negative Reply".
Particularly, all records are marked with "Reply" when S Type is
REQUEST_ALL.
3. If any case in step 2 is marked with "Negative Reply", ACS would
construct a PFX_INFO-NAK message to reply to the AER. Otherwise,
a PFX_INFO-ACK message is constructed to reply the AD prefix
information of all members marked with "Reply" to the AER.
5.2.3. Response of AD Prefix Information
AD prefix information response includs two types. That is PFX_INFO-
ACK and PFX_INFO-NAK. According to the request sent by AER, if some
fields are wrong, ACS will reply NAK, in which the error code is
"parameter error". If a non-existent member AD is queried, the error
code is "the requested member AD does not exist", which defined as
before will not be repeated. The following mainly introduces
PFX_INFO-ACK response. ACS fills in the following values for each
field:
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+=================+=============================================+
| Field | Value |
+=================+=============================================+
| Version | 1 |
+-----------------+---------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+---------------------------------------------+
| I Type | AD_PREFIX_INFO |
+-----------------+---------------------------------------------+
| S Type | ACK: representing affirmative |
| | acknowledgement. NAK: representing |
| | negative acknowledgement. |
+-----------------+---------------------------------------------+
| Operation | RENEW: replying the latest AD prefix |
| | information to AER. |
+-----------------+---------------------------------------------+
| Total Length | The length of this message. |
+-----------------+---------------------------------------------+
| Number of | S Type = ACK: the number of API_Rec in Data |
| Records | field. S Type = NAK: 0 |
+-----------------+---------------------------------------------+
| Transaction | The last Transaction Number add 1. ACS |
| Number | would maintain a global Transaction Number |
| | for packets sent out to AER where I Type is |
| | AD_PREFIX_INFO and ACS would keep it |
| | increasing monotonic. |
+-----------------+---------------------------------------------+
| Acknowledgement | The Transaction Number of the response |
| Number | corresponding request. |
+-----------------+---------------------------------------------+
| Data | S Type = ACK: One or more latest requested |
| | API_Rec. S Type = NAK: a 32-bit error code |
| | defined in Section 3. There is no boundary |
| | identification between these API_Recs, |
| | which requires that the implementation of |
| | the protocol can process each record |
| | sequentially until the end of this message. |
+-----------------+---------------------------------------------+
Table 11
When receiving a non-RENEW PFX_INFO-ACK message which is the positive
reply to the request of AD prefix sent from ACS to AER, if it holds
that some fields are wrong, AER could send a request message to
acquire the latest AD prefix information. Otherwise, AER would act
as follows.
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1. AER SHOULD compare the Transaction Number in this packet with
Transaction Number whose I Type is PFX_INFO received from the
same ACS before. If bigger, AER would process them as follows.
Otherwise, AER would discard this packet and send REG_INFO-
RequestAll and PFX_INFO-RequestAll messages to acquire the
lastest information.
2. AER processes every API_Rec: - If Action is ADD and the record
does not exist in its maintained prefix list, AER would add this
record to its prefix list. - If Action is ADD and the record
exists in its maintained prefix list, AER would do nothing. - If
Action is DEL and the record exists in its maintained prefix
list, AER would remove this record from its prefix list after
Effecting Time.
3. If a change is made in step 2, the update should take effect
after the Effecting Time, which acts on the data plane. If the
Effecting Time is earlier than the current time or is all 0, it
will take effect immediately.
AER acts as following when receiving a RENEW PFX_INFO-ACK message.
When ACS initiates RENEW process, it would send a RENEW meesge with
which the first bit of Operation field is 1. The second bit of
Operation field identifies the begin of a procedure of RENEW and the
third bit of Operation field identifies the end of a procedure of
RENEW. ACS MUST NOT send a RENEW packet with which the first bit of
Operation field is 0 in RENEW process. AER SHOULD uniformly process
all packets in this RENEW process after receiving all RENEW packets.
1. AER SHOULD compare the Transaction Number in this packet with
Transaction Number whose I Type is PFX_INFO received from the
same ACS before. If bigger, AER WOULD process as step 2.
Otherwise, AER would discard this message and send REG_INFO-
RequestAll and PFX_INFO-RequestAll messages to acquire the
lastest information.
2. AER processes every API_Rec. All Action in API_Recs is ADD
during RENEW process. - If the record does not exist in its
maintained prefix list, AER would add this record to its trust
alliance list. - If the record exists in its maintained prefix
list, AER would do nothing. - If there are some records in the
original prefix list that do not appear in the Data field during
this RENEW process, these records will be deleted immediately.
3. If a change is made in step 2, the update message should take
effect after the Effecting Time, which acts on the data plane.
If the Effecting Time is earlier than current time or is all 0,
it will take effect immediately.
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When AER receives an PFX_INFO-NAK message, it could send REG_INFO-
RequestAll and PFX_INFO-RequestAll messages to ACS to acquire the
latest AD registration information and AD prefix information.
5.3. Deployment, Request and Response of State Machine Information
5.3.1. Deployment of State Machine Information
State machine information deployment (SM_INFO-Deploy) is sent from
ACS to AER. ACS fills in the following values for each field:
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+=================+===============================================+
| Field | Value |
+=================+===============================================+
| Version | 1 |
+-----------------+-----------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+-----------------------------------------------+
| I Type | SM_INFO |
+-----------------+-----------------------------------------------+
| S Type | DEPLOYMENT |
+-----------------+-----------------------------------------------+
| Operation | NULL: to publish the partial update of state |
| | machine maintained by the pair of this AD and |
| | another AD and Operation is RENEW: to publish |
| | wholesome update of state machine maintained |
| | by the pair of this AD and another AD. |
+-----------------+-----------------------------------------------+
| Total Length | The length of this message. |
+-----------------+-----------------------------------------------+
| Number of | The number of SMI_Recs in Data field |
| Records | |
+-----------------+-----------------------------------------------+
| Transaction | The last Transaction Number add 1. ACS would |
| Number | maintain a global Transaction Number for |
| | packets sent out to AER where I Type is |
| | SM_INFO and ACS would keep it increasing |
| | monotonic. |
+-----------------+-----------------------------------------------+
| Acknowledgement | 0 |
| Number | |
+-----------------+-----------------------------------------------+
| Data | One or more SMI_Recs. There is no boundary |
| | identification between these ARI_Recs, which |
| | requires that the implementation of the |
| | protocol can process each record sequentially |
| | until the end of this message. |
+-----------------+-----------------------------------------------+
Table 12
It should be noted that state machine is responding to a ordered AD
pair. The state machine information mastered by ACS includes the
state machine information from this AD to another member AD, and the
state machine information from another member AD to this AD. When
ACS deployment is partially updated, only some changed or newly added
state machines are deployed. When ACS deploys the update of RENEW
message, it is necessary to deploy all existing and updated
information. For the same ordered AD pair, there cannot be two or
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more SMI_Recs using the same SM_ID in Data field. In addition, there
are two actions for SMI_Rec: one is to add a SM whose SM_ID is bigger
than current using state machine. The second is to modify an
existing state machine whose SM_ID equals to current using state
machine. Both of them are using Action ADD. Here we requires only
Transition Interval and Expiring Time can be updated.
When receiving a non-RENEW SM_INFO-Deploy message sent from ACS to
AER, if it holds that some fields are wrong, for example, Action is
DEL or SM_ID is smaller than current state machine in using, AER
could send a request message to acquire the latest information.
Otherwise, AER would act as follows.
1. AER SHOULD compare the Transaction Number in this packet with
Transaction Number whose I Type is SM_INFO received from the same
ACS before. If bigger, AER WOULD process them as step 2.
Otherwise, AER would discard this packet and send REG_INFO-
RequestAll and request messages to acquire the lastest
information.
2. AER processes every SMI_Rec: - If SM_ID equals to the current
using state machine, AER should update the state machine in use.
- If SM_ID bigger than the current using state machine, AER
should add this state machine to its list.
3. If a change is made in step 2, the update message should take
effect after the Effecting Time, which acts on the data plane.
If the Effecting Time is earlier than the current time or is all
0, it will take effect immediately.
AER acts as following when receiving a RENEW SM_INFO-Deploy message.
When ACS initiates RENEW process, it would send a RENEW meesge with
which the first bit of Operation field is 1. The second bit of
Operation field identifies the begin of a procedure of RENEW and the
third bit of Operation field identifies the end of a procedure of
RENEW. ACS MUST NOT send a RENEW packet with which the first bit of
Operation field is 0 in RENEW process. AER SHOULD uniformly process
all packets in this RENEW process after receiving all RENEW packets.
1. AER SHOULD compare the Transaction Number in this packet with
Transaction Number whose I Type is SM_INFO received from the same
ACS before. If bigger, AER WOULD process as step 2. Otherwise,
AER would discard this message and send a request messages to
acquire the lastest information.
2. AER processes every SMI_Rec. - If SM_ID equals to the current
using state machine, AER should update the state machine in use.
- If SM_ID bigger than the current using state machine, AER
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should add this state machine to its list. - If there are some
records of state machines in use that do not appear in the Data
field during this RENEW process, these state machines will be
deleted immediately.
3. If a change is made in step 2, the update message should take
effect after the Effecting Time, which acts on the data plane.
If the Effecting Time is earlier than current time or is all 0,
it will take effect immediately.
5.3.2. Request of State Machine Information
State machine information request (SM_INFO-Request) is sent from AER
to ACS. AER fills in the following values for each field:
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+=================+=================================================+
| Field | Value |
+=================+=================================================+
| Version | 1 |
+-----------------+-------------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+-------------------------------------------------+
| I Type | SM_INFO |
+-----------------+-------------------------------------------------+
| S Type | REQUEST: querying the state machines |
| | maintained by the pair of this AD to |
| | another member AD and vice versa. These |
| | member ADs are specified by ADID_Rec |
| | defined in Data field. REQUEST_ALL: |
| | querying all state machines maintained |
| | by this AD with other member ADs. |
+-----------------+-------------------------------------------------+
| Operation | NULL |
+-----------------+-------------------------------------------------+
| Total Length | The length of this message. |
+-----------------+-------------------------------------------------+
| Number of | S Type = REQUEST: the number of ADID_Rec |
| Records | in Data field. S Type = REQUEST_ALL: 0. |
+-----------------+-------------------------------------------------+
| Transaction | The last Transaction Number add 1. AER |
| Number | would maintain a global Transaction |
| | Number for packets sent out to ACS where |
| | I Type is SM_INFO and AER would keep it |
| | increasing monotonic. |
+-----------------+-------------------------------------------------+
| Acknowledgement | 0 |
| Number | |
+-----------------+-------------------------------------------------+
| Data | S Type = REQUEST: One or more ADID_Recs. |
| | S Type = REQUEST_ALL: none. There is no |
| | boundary identification between these |
| | ADID_Recs, which requires that the |
| | implementation of the protocol can |
| | process each record sequentially until |
| | the end of this message. |
+-----------------+-------------------------------------------------+
Table 13
For example, let this AD is AD1. When any ADID_Rec including in Data
field, defined as AD2, it means that AER will request the SM(AD1,
AD2) and SM(AD2, AD1). When ACS replies, it will reply these two
state machines both.
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When receiving a SM_INFO-Request(All) message, if it holds that some
fields are wrong, ACS could send a PFX_INFO-NAK. Otherwise, ACS
would act as follows. The specific construction methods of SM_INFO-
ACK and SM_INFO-NAK are described in secion 3.2.3.3.
1. ACS SHOULD compare the Transaction Number in this packet with
Transaction Number whose I Type is SM_INFO received from the same
AER before. If bigger, ACS WOULD process them as step 2.
Otherwise, ACS would discard this packet and send a SM_INFO-NAK
message.
2. ACS processes every ADID_Rec. If AD exists in the maintained
trust alliance list, ACS would mark this record as "Reply".
Otherwise, ACS wourld mark this rocord as "Negative Reply".
Particularly, all records are marked with "Reply" when S Type is
REQUEST_ALL.
3. If any case in step 2 is marked with "Negative Reply", ACS would
construct a SM_INFO-NAK message to reply to the AER. Otherwise,
a SM_INFO-ACK message is constructed to reply the state machine
information of all members marked with "Reply" to the AER.
5.3.3. Response of State Machine Information
State machine information response includs two types. That is
SM_INFO-ACK and SM_INFO-NAK. Both of them are sent from ACS to AER.
ACS fills in the following values for each field:
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+=================+=============================================+
| Field | Value |
+=================+=============================================+
| Version | 1 |
+-----------------+---------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+---------------------------------------------+
| I Type | SM_INFO |
+-----------------+---------------------------------------------+
| S Type | ACK: representing affirmative |
| | acknowledgement. NAK: representing |
| | negative acknowledgement. |
+-----------------+---------------------------------------------+
| Operation | RENEW: replying the latest state machine |
| | information to AER. |
+-----------------+---------------------------------------------+
| Total Length | The length of this message. |
+-----------------+---------------------------------------------+
| Number of | S Type = ACK: the number of SMI_Recs in |
| Records | Data field. S Type = NAK: 0. |
+-----------------+---------------------------------------------+
| Transaction | The last Transaction Number add 1. ACS |
| Number | would maintain a global Transaction Number |
| | for packets sent to AER where I Type is |
| | SM_INFO and would keep it increasing |
| | monotonic. |
+-----------------+---------------------------------------------+
| Acknowledgement | The Transaction Number of the response |
| Number | corresponding request. |
+-----------------+---------------------------------------------+
| Data | S Type = ACK: one or more latest requested |
| | SMI_Rec. S Type = NAK: a 32-bit error code |
| | defined in Section 3. There is no boundary |
| | identification between these ADID_Recs, |
| | which requires that the implementation of |
| | the protocol can process each record |
| | sequentially until the end of this message. |
+-----------------+---------------------------------------------+
Table 14
When receiving a non-RENEW SM_INFO-ACK message which is the positive
reply to the request of AD prefix sent from ACS to AER, if it holds
that some fields are wrong, AER could send a request message to
acquire the latest state machine information. Otherwise, AER would
act as follows. 1. AER SHOULD compare the Transaction Number in this
packet with Transaction Number whose I Type is PFX_INFO received from
the same ACS before. If bigger, AER WOULD process them as step 2.
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Otherwise, AER would discard this packet and send a SM_INFO-
RequestAll message to acquire the lastest information. 2. AER
processes every SMI_Rec: - If SM_ID equals to the current using state
machine, AER should update the state machine in use. - If SM_ID
bigger than the current using state machine, AER should add this
state machine to its list. 3. If a change is made in step 2, the
update should take effect after the Effecting Time, which acts on the
data plane. If the Effecting Time is earlier than the current time
or is all 0, it will take effect immediately.
AER acts as following when receiving a RENEW SM_INFO-ACK message.
When ACS initiates RENEW process, it would send a RENEW meesge with
which the first bit of Operation field is 1. The second bit of
Operation field identifies the begin of a procedure of RENEW and the
third bit of Operation field identifies the end of a procedure of
RENEW. ACS MUST NOT send a RENEW packet with which the first bit of
Operation field is 0 in RENEW process. AER SHOULD uniformly process
all packets in this RENEW process after receiving all RENEW packets.
1. AER SHOULD compare the Transaction Number in this packet with
Transaction Number whose I Type is SM_INFO received from the same
ACS before. If bigger, AER WOULD process as step 2. Otherwise,
AER would discard this message and send a SM_INFO-RequestAll
message to acquire the lastest information.
2. AER processes every API_Rec. All Action in API_Recs is ADD
during RENEW process. - If SM_ID equals to the current using
state machine, AER should update the state machine in use. - If
SM_ID bigger than the current using state machine, AER should add
this state machine to its list. - If there are some records of
state machines in use that do not appear in the Data field during
this RENEW process, these state machines will be deleted
immediately.
3. If a change is made in step 2, the update message should take
effect after the Effecting Time, which acts on the data plane.
If the Effecting Time is earlier than current time or is all 0,
it will take effect immediately.
When AER receives an SM_INFO-NAK message, it could send a SM_INFO-
RequestAll message to ACS to acquire the latest state machine
information.
5.4. Request and Response of Keep-alive Information
In SAVA-X, ACS will periodically send Keep-alive request to query the
availability of AER in SAVA-X mechanism.
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5.4.1. Request of Keep-alive Information
Keep-alive information request (ALIVE_INFO-Request) is sent by ACS to
test the viability of AER. AER would reply to ACS when receiving a
ALIVE_INFO-Request message. ACS considers that AER has gone wrong if
it does not receive a response from AER within 60 seconds and ACS
notifies the AD administrator of the failure information by email.
ACS would keep sending ALIVE_INFO-Request to the fault AER at the
same time. The filling values of each field in ACS request are as
follows:
+=================+================================================+
| Field | Value |
+=================+================================================+
| Version | 1 |
+-----------------+------------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+------------------------------------------------+
| I Type | ALIVE_INFO |
+-----------------+------------------------------------------------+
| S Type | REQUEST |
+-----------------+------------------------------------------------+
| Operation | NULL |
+-----------------+------------------------------------------------+
| Total Length | The length of this message. |
+-----------------+------------------------------------------------+
| Number of | 0 |
| Records | |
+-----------------+------------------------------------------------+
| Transaction | The last Transaction Number add 1. ACS would |
| Number | maintain a global Transaction Number for |
| | packets sent to AER where I Type is ALIVE_INFO |
| | and would keep it increasing monotonic. |
+-----------------+------------------------------------------------+
| Acknowledgement | 0 |
| Number | |
+-----------------+------------------------------------------------+
| Data | None |
+-----------------+------------------------------------------------+
Table 15
ACS considers that AER has gone wrong if it does not receive a
response from AER within 60 seconds and ACS notifies the AD
administrator of the failure information by email. ACS would
consider that AER has recovered from failure when AER reply to the
request correctly. ACS performs the following steps to update AER:
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1. Keep time synchronization between AER and ACS.
2. Deploy AD registration information, AD prefix information and
state machine information to AER by the way of RENEW message.
5.4.2. Response of Keep-alive Information
Keep-alive information response (ALIVE_INFO-Response) is sent by AER
to reply the ALIVE_INFO-Request message.
In response to ALIVE_INFO-Request, AER fills in the following values
for each field in the response:
+=================+================================================+
| Field | Value |
+=================+================================================+
| Version | 1 |
+-----------------+------------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+------------------------------------------------+
| I Type | ALIVE_INFO |
+-----------------+------------------------------------------------+
| S Type | ACK |
+-----------------+------------------------------------------------+
| Operation | NULL |
+-----------------+------------------------------------------------+
| Total Length | The length of this message. |
+-----------------+------------------------------------------------+
| Number of | 0 |
| Records | |
+-----------------+------------------------------------------------+
| Transaction | The last Transaction Number add 1. AER would |
| Number | maintain a global Transaction Number for |
| | packets sent to ACS where I Type is ALIVE_INFO |
| | and would keep it increasing monotonic. |
+-----------------+------------------------------------------------+
| Acknowledgement | 0 |
| Number | |
+-----------------+------------------------------------------------+
| Data | None |
+-----------------+------------------------------------------------+
Table 16
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6. Deployment of Tag Information
Tag information deployment (TAG_INFO-Deploy) is sent from ACS to AER
and AER would add, verify and remove the tag to packet. When using
sub trust alliance level tags and AD_V tags, the primary address
domain ACS needs to distribute these two tags to the ACS of the
boundary address domain first, and then the boundary address domain
ACS will distribute these tags to their respective address domains'
AERs. The sub trust alliance tag is used in the data plane to cross
different address domain levels. The AD_V tag is used in the data
plane when it is sent from the current address domain to the boundary
address domain. Standard TAG_INFO is used in the data plane at the
same level and under the same direct parent address field. The three
types of tags use the same message format as follows.
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
+-+-+-+-+-+-+-+-+
| Action |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source ADID_Rec |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination ADID_Rec |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag Len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ TAG ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Transition Interval |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 3: Format of tag information record.
Action: 8-bit filed. 1 for add (ADD=1) and 2 for delete (DEL=2).
Source ADID_Rec: Variable-length field. Refer to ADID_Rec in
[savax-control].
Destination ADID_Rec: Variable-length field. Refer to ADID_Rec.
Tag Len: The length of TAG. The equation for calculation is (Tag
Len + 1) * 8 bits. The length of TAG MUST be multiple times of 8
bits. The maximum length is 128 bits and the minimum length is 32
bits. So the minimum of Tag Len is 0011.
TAG: Variable-length field. The actual Tag or packet signature.
Transition Interval: 32-bit, the milliseconds of interval of state
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transition.
When ACS announce tag to ACS or AER, it fills in the following values
for each field:
+=================+===============================================+
| Field | Value |
+=================+===============================================+
| Version | 1 |
+-----------------+-----------------------------------------------+
| Alliance | The sub-trust alliance number. |
+-----------------+-----------------------------------------------+
| I Type | TAG_INFO, ALLI_TAG_INFO or AD_V_TAG_INFO |
+-----------------+-----------------------------------------------+
| S Type | ANNOUNCEMENT |
+-----------------+-----------------------------------------------+
| Operation | NULL |
+-----------------+-----------------------------------------------+
| Total Length | The length of this message. |
+-----------------+-----------------------------------------------+
| Number of | The number of TAG_Rec in Data field. |
| Records | |
+-----------------+-----------------------------------------------+
| Transaction | ACS would maintain a global Transaction |
| Number | Number for packets sent to ACS or AER where I |
| | Type is TAG_INFO and would keep it increasing |
| | monotonic. Acknowledgement Number is 0. |
+-----------------+-----------------------------------------------+
| Acknowledgement | 0 |
| Number | |
+-----------------+-----------------------------------------------+
| Data | One or more TAG_Recs. There is no boundary |
| | identification between these records, which |
| | requires that the implementation of the |
| | protocol can process each record sequentially |
| | until the end of this message. |
+-----------------+-----------------------------------------------+
Table 17
7. Security Considerations
TBD.
8. IANA Considerations
TBD.
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9. References
9.1. Normative References
[RFC1760] Haller, N., "The S/KEY One-Time Password System",
RFC 1760, DOI 10.17487/RFC1760, February 1995,
<https://www.rfc-editor.org/rfc/rfc1760>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/rfc/rfc2119>.
[RFC5210] Wu, J., Bi, J., Li, X., Ren, G., Xu, K., and M. Williams,
"A Source Address Validation Architecture (SAVA) Testbed
and Deployment Experience", RFC 5210,
DOI 10.17487/RFC5210, June 2008,
<https://www.rfc-editor.org/rfc/rfc5210>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/rfc/rfc8174>.
[RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", STD 86, RFC 8200,
DOI 10.17487/RFC8200, July 2017,
<https://www.rfc-editor.org/rfc/rfc8200>.
9.2. Informative References
[savax-control]
Computer Science, Wu, J., Computer Science, and Institute
for Network Sciences and Cyberspace, "Control Plane of
Inter-Domain Source Address Validation Architecture",
2023.
Acknowledgments
TODO acknowledge.
Authors' Addresses
Ke Xu
Computer Science, Tsinghua University
Beijing
China
Email: xuke@tsinghua.edu.cn
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Jianping Wu
Computer Science, Tsinghua University
Beijing
China
Email: jianping@cernet.edu.cn
Xiaoliang Wang
Computer Science, Tsinghua University
Beijing
China
Email: wangxiaoliang0623@foxmail.com
Yangfei Guo
Zhongguancun Laboratory
Beijing
China
Email: guoyangfei@zgclab.edu.cn
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