BIND 10 #3343: Kea not responding when is configured only with subnet with client classification

[BIND 10 Development]

#3343: Kea not responding when is configured only with subnet with client
classification
-------------------------------------+-------------------------------------
                   Reporter:         |                 Owner:
  wlodekwencel                       |                Status:  new
                       Type:         |             Milestone:  DHCP-Kea-
  defect                             |  proposed
                   Priority:         |              Keywords:
  medium                             |             Sensitive:  0
                  Component:  dhcp   |           Sub-Project:  DHCP
               CVSS Scoring:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
-------------------------------------+-------------------------------------
 Kea is not responding when it's configured with subnets that has client
 classification activated. Dropping every message no matter if it has
 vendor class option (with proper vendor ID) or not.
 Example configuration files when kea is NOT responding:
 {{{
 config add Dhcp4/subnet4
 config set Dhcp4/subnet4[0]/subnet "192.168.50.0/24"
 config set Dhcp4/subnet4[0]/pool [ "192.168.50.1-192.168.50.1" ]
 config set Dhcp4/subnet4[0]/client-class "my-own-class"
 config commit
 }}}
 or

 {{{
 config add Dhcp4/subnet4
 config set Dhcp4/subnet4[0]/subnet "192.168.50.0/24"
 config set Dhcp4/subnet4[0]/pool [ "192.168.50.1-192.168.50.1" ]
 config set Dhcp4/subnet4[0]/client-class "my-own-class"
 config add Dhcp4/subnet4
 config set Dhcp4/subnet4[1]/subnet "192.168.50.0/24"
 config set Dhcp4/subnet4[1]/pool [ "192.168.50.10-192.168.50.10" ]
 config set Dhcp4/subnet4[1]/client-class "my-other-class"
 config commit
 }}}

 with such configuration Kea logging:
 {{{
 INFO  [b10-dhcp4.dhcp4/13106] DHCP4_NO_SUBNET_FOR_DIRECT_CLIENT no
 suitable subnet configured for a direct client sending packet with
 transaction id 1443283, on interface eth1, received message is dropped
 }}}

 When Kea is configured with additional subnet without client-
 classification it's responding on every message (with vendor class option
 or not).
 Example of configuration when Kea is responding:
 {{{
 config add Dhcp4/subnet4
 config set Dhcp4/subnet4[0]/subnet "192.168.50.0/24"
 config set Dhcp4/subnet4[0]/pool [ "192.168.50.1-192.168.50.1" ]
 config set Dhcp4/subnet4[0]/client-class "my-own-class"
 config add Dhcp4/subnet4
 config set Dhcp4/subnet4[1]/subnet "192.168.50.0/24"
 config set Dhcp4/subnet4[1]/pool [ "192.168.50.10-192.168.50.10" ]
 config commit
 }}}

 or

 {{{
 config add Dhcp4/subnet4
 config set Dhcp4/subnet4[0]/subnet "192.168.50.0/24"
 config set Dhcp4/subnet4[0]/pool [ "192.168.50.1-192.168.50.1" ]
 config set Dhcp4/subnet4[0]/client-class "my-own-class"
 config add Dhcp4/subnet4
 config set Dhcp4/subnet4[1]/subnet "192.168.50.0/24"
 config set Dhcp4/subnet4[1]/pool [ "192.168.50.10-192.168.50.10" ]
 config set Dhcp4/subnet4[1]/client-class "my-other-class"
 config add Dhcp4/subnet4
 config set Dhcp4/subnet4[2]/subnet "192.168.50.0/24"
 config set Dhcp4/subnet4[2]/pool [ "192.168.50.100-192.168.50.100" ]
 config commit
 }}}

 For reproduction of those tests pleas use Forge (for now v4 tests are
 available on  ip_v4_support branch, not master)
 test names:
 v4.client.classification.one.class.one-subnet
 v4.client.classification.multiple.classes.two-subnets-different-chaddr

 Also attaching logs/config files/captures of all failed tests and one
 passed.

-- 
Ticket URL: <http://bind10.isc.org/ticket/3343>
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BIND 10 Development