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= Honeycomb translation layer SPI implementation for VPP CORE
Provides customizers for VPP YANG models translation.
== Handlers
=== Writers
Current order of v3po-api writers is:
. BridgeDomain
. VhostUser
. VxlanGpe
. Tap
. Vxlan
. Interface
. SubInterface
. L2
. Subinterface-L2
. Ethernet
. Routing
. ClassifyTable
. ClassifySession
. Acl
. Ipv6
. Ipv4
. Address
. Neighbor
. L2FibEntry
. Rewrite
. Address
. Acl
To find out current order in runtime, turn on logging for writer registry:
log:set TRACE io.fd.hc2vpp.v3po.translate.util.write.registry
=== Readers
There is not a strict order for readers, but current configuration produces approx. this order:
Contexts
. VppState
. Version
. BridgeDomains
. BridgeDomain
. L2FibTable
. L2FibEntry
. InterfacesState
. Interface
. VppInterfaceStateAugmentation
. Ethernet
. Tap
. VhostUser
. Vxlan
. VxlanGpe
. L2
. Acl
. Interface2
. Ipv4
. Address
. Neighbor
. Ipv6
. SubinterfaceStateAugmentation
. SubInterfaces
. SubInterface
. L2
. Rewrite
. Ipv4
. Address
. Acl
. VppClassifierState
. ClassifyTable
. ClassifySession
. NetconfState
== VPP to IETF-ACL model translation
Package provides VPP translation code for draft-ietf-netmod-acl-model-08.
Access control lists are mapped to chains of classify tables, each with single classify session.
=== Available operations
==== Configuration data
Configuration data for the model is stored in Honeycomb. Corresponding classify tables and sessions
are not created until control access list is assigned to an interface.
Classify tables and sessions are removed from VPP when ACL assignment is deleted.
ACLs can be shared among interfaces, but each time, new instance of classify table chain would be created in VPP.
ACLs that are assigned to an interface have to be unassigned before update/removal.
==== Operational state
Operational read in terms of ietf-acl model is not supported (would require storing additional metadata in vpp).
As a consequence, configuration data initialization based on operational state is not possible.
To check how ietf-acl model was translated to classify tables/session, low-level vpp-classfier model can be used.
=== Restrictions
VPP classfier works in form of offsets and masks of 16B units.
The offset always starts at the beginning of L2 Ethernet header
of input packet. Because IP header can have variable length,
source/destination port matching (L4 features of ietf-acl model) is not possible.
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