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Code Issues Releases Wiki Activity

[#1180] Addressed review comments

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Thomas Markwalder
2020-05-19 11:20:29 -04:00
parent 098dd18824
commit 61d4807245
1 changed files with 41 additions and 40 deletions
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81
doc/sphinx/arm/hooks-lease-query.rst
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@@ -14,28 +14,28 @@ added in the near future.
``kea-dhcp6`` process.
The Leasequery library is part of the premium source code and is
available to ISC's paid support customers.
available to ISC's paid support customers.
.. lease-query-dhcpv4:
DHCPv4 Leasequery
~~~~~~~~~~~~~~~~~
DHCPv4 simple Leasequery provides a requestor the ability to query for
DHCPv4 simple Leasequery provides a requester the ability to query for
active lease information for either a single IP address or a single client.
RFC 4388 calls for three such queries:
RFC 4388 calls for three such queries:
- Query by IP address
The IP address of interest is contained within the ``ciaddr`` field of
the query.
- Query by hardware address
The hardware address of interest is contained with the ``chaddr`` field
of the query.
of the query.
- Query by client identifier
The client identifier of interest is sent in the dhcp-client-identifier
option (61) of the query.
The inbound DHCPLEASEQUERY packet must supply only one of the three values
The inbound DHCPLEASEQUERY packet must supply only one of the three values
above. Queries which supply more than one of these values are dropped.
In addition, the query must contain the IP address of the requester in
@@ -45,21 +45,21 @@ list of IP addresses which are permitted to query. This list of valid
requester addresses is specified as part of the Leasequery hook library's
configuration (See the section on configuration below).
In response to a valid query, the server will return one of three message
In response to a valid query, the server will return one of three message
types:
- DHCPLEASEUNKNOWN
Returned when the IP address of interest is not one the server knows
about (query by IP address); or there are no active leases for the
- DHCPLEASEUNKNOWN
Returned when the IP address of interest is not one the server knows
about (query by IP address); or there are no active leases for the
client of interest (query by hardware address or client id).
- DHCPLEASEUNASSIGNED
- DHCPLEASEUNASSIGNED
Returned when the IP address is one the server knows of but for which
there are no active leases (applies only to query by IP address).
- DHCPLEASEACTIVE
Returned when there is at least one active lease found matching the
criteria.
criteria.
For both DHCPLEASEUNKNOWN and DHCPLEASEUNASSIGNED responses, the only
information sent back to the requester in response is the query parameter
@@ -75,41 +75,42 @@ In addition, one or more of the following options will be included:
.. tabularcolumns:: |p{0.2\linewidth}|p{0.1\linewidth}|p{0.7\linewidth}|
.. table:: DHCPLEASEACTIVTE Options
.. table:: DHCPLEASEACTIVE Options
:class: longtable
:widths: 20 10 70
+-----------------------------+-------+-----------------------------------------------+
| Option | Code | Content |
+=============================+=======+===============================================+
| dhcp-client-identifier | 61 | copied from the lease (if one) |
+-----------------------------+-------+-----------------------------------------------+
| client-last-transction-time | 91 | amount of time that has elapsed since the |
| (CLTT) | | lease's actual CLTT. This value will also be |
| | | used by the server to adjust life time and |
| | | timer values. |
+-----------------------------+-------+-----------------------------------------------+
| dhcp-lease-time | 51 | lease's life time reduced by CLTT |
+-----------------------------+-------+-----------------------------------------------+
| dhcp-renewal-time | 58 | as controlled by kea-dhcp4 configuration and |
| | | then reduced by CLTT |
+-----------------------------+-------+-----------------------------------------------+
| dhcp-rebind-time | 59 | as dictacted by kea-dhcp4 configuration and |
| | | then reduced by CLTT |
+-----------------------------+-------+-----------------------------------------------+
| dhcp-agent-options | 82 | if stored on the lease. (See |
| | | :ref:`dhcp4-store-extended-info`) |
+-----------------------------+-------+-----------------------------------------------+
| associated-ip | 92 | a list of all other IP addresses for which the|
| | | the client has active leases. (Does not apply |
| | | to query by IP address) |
+-----------------------------+-------+-----------------------------------------------+
+------------------------------+-------+-----------------------------------------------+
| Option | Code | Content |
+==============================+=======+===============================================+
| dhcp-client-identifier | 61 | copied from the lease (if one) |
+------------------------------+-------+-----------------------------------------------+
| client-last-tranasction-time | 91 | amount of time that has elapsed since the |
| (CLTT) | | lease's client-last-transation-time (CLTT) |
| | | This value will also be used by the server to |
| | | adjust life time and timer values. |
+------------------------------+-------+-----------------------------------------------+
| dhcp-lease-time | 51 | lease's life time reduced by CLTT |
+------------------------------+-------+-----------------------------------------------+
| dhcp-renewal-time | 58 | as controlled by kea-dhcp4 configuration and |
| | | then reduced by CLTT |
+------------------------------+-------+-----------------------------------------------+
| dhcp-rebind-time | 59 | as dictacted by kea-dhcp4 configuration and |
| | | then reduced by CLTT |
+------------------------------+-------+-----------------------------------------------+
| dhcp-agent-options | 82 | if stored on the lease. (See |
| | | :ref:`dhcp4-store-extended-info`) |
+------------------------------+-------+-----------------------------------------------+
| associated-ip | 92 | a list of all other IP addresses for which |
| | | the client has active leases. (Does not apply |
| | | to query by IP address) |
+------------------------------+-------+-----------------------------------------------+
The dhcp-server-identifier option (54) will be returned in all responses in keeping with
RFC 2131 section 4.3.1.
RFC 4388 allows requestors to request specific options via a PRL (Option 55).
This is not currently supported but may be added at a future date.
RFC 4388 allows requesters to ask for specific options via the
dhcp-parameter-request-list (PRL, option 55). This is not currently supported but
may be added at a future date.
.. lease-query-dhcpv4-config:
@@ -120,7 +121,7 @@ Configuring the Leasequery hook library for use is straight forward. It current
supports a single parameter, ``requesters``, which is a list of IP addresses from
which DHCPLEASEQUERY packets will be accepted. In other words, it is a list of
known requesters. The following shows an example configuration with two requester
addresses:
addresses:
::