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@startuml
title DHCPv4 subnet selection (Kea 1.8.0)
agent "Entry point" as entry
agent "Try RAI link select" as rai_link_select
agent "Try subnet selection option" as subnet_select
rectangle "Relayed" as relayed {
agent "Relay address matches subnet" as relay_subnet
agent "Relay address matches shared network" as relay_network
agent "Check client class" as relay_class
}
rectangle "Set address for lookup" as set_address {
agent "Set relay address" as relay_address
agent "Set client address" as client_address
agent "Set source address" as source_address
}
rectangle "Try incoming interface" as interface {
agent "Interface matches subnet" as interface_subnet
agent "Interface matches shared network" as interface_network
agent "Check client class" as interface_class
agent "Set interface address" as interface_address
}
rectangle "Try address" as address {
agent "Check subnet prefix" as inRange
agent "Check client class" as address_class
}
agent "Found a subnet" as found
agent "Found no subnet" as not_found
agent "Callout subnet4_select" as subnet4_select
agent "Return a subnet" as success
agent "Return no subnet" as no_subnet
agent "Drop query" as drop
entry --> rai_link_select
rai_link_select --> subnet_select
subnet_select --> relayed : relayed
subnet_select --> set_address : not relayed
relayed --> relay_subnet
relay_subnet --> relay_network : no match
relay_subnet --> relay_class : match
relay_network --> set_address : no match
relay_network --> relay_class : match
relay_class ---> found : compatible
relay_class --> set_address : not compatible
set_address --> relay_address : try the relay address
relay_address -r-> client_address : has no relay address
client_address -r-> source_address : has no client address
source_address --> interface_subnet : no suitable address
relay_address --> inRange : has a relay address
client_address --> inRange : has a client address
source_address --> inRange : has source address and use unicast
interface_subnet ---> not_found : no interface
interface_subnet --> interface_class : match
interface_subnet --> interface_network : no match
interface_network --> interface_class : march
interface_network ---> not_found : no match
interface_class ---> found : compatible
interface_class ---> interface_address : not compatible
interface_address --> inRange : has an interface address
interface_address ---> not_found : no interface address
inRange ---> address_class : match
inRange ---> not_found : no match
address_class ---> found : compatible
address_class ---> not_found : not compatible
found --> subnet4_select
not_found --> subnet4_select
found -[hidden]> not_found
subnet4_select --> success : CONTINUE and subnet set
subnet4_select --> no_subnet : SKIP or subnet not set
subnet4_select --> drop : DROP
@enduml
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