[NFCT.TETHER.7] Prepare the downstream information for IPv4 offload rule

Add and remove downstream client information to BpfCoordinator

Required for building IPv4 forwarding rule when a conntrack event is
received. The IpServer provides the following elements of a rule which
is not included in conntrack event:
- Downstream interface index
- Downstream Mac address
- Client IP address to Client Mac address

Test: atest TetheringCoverageTests
Change-Id: I84db13acc047ace5730d17f0d3dd99544f516084
2 files changed
tree: 69accc664962c391afc0c8342b0ce1eca1e9e3b1
  1. framework/
  2. tests/
  3. Tethering/
  4. .gitignore
  5. OWNERS
  6. PREUPLOAD.cfg
  7. TEST_MAPPING