commit b1d3ccbeb6357a251e90a6fb740405877a8019aa
author Hungming Chen <nuccachen@google.com> Sun Jan 16 14:47:52 2022 +0800
committer Hungming Chen <nuccachen@google.com> Sat Jan 22 20:07:24 2022 +0800
tree 61087037acc8930530d28c9fd70e55270d25be9f
parent 8ebdb6f1fe21ae49d5a5cacce553370e886ebbab

[CLATJ#19] ClatdCoordinator: configure bpf for clat

Configure eBPF offload at clat starting if possible.

Bug: 212345928
Test: connect to ipv6 only network and check bpf entries
$adb shell dumpsys netd --short | grep Clat -A10
  ClatdController
    Trackers: iif[iface] nat64Prefix v6Addr -> v4Addr v4iif[v4iface] [fwmark]
    BPF ingress map: iif(iface) nat64Prefix v6Addr -> v4Addr oif(iface)
      47(wlan0) 64:ff9b::/96 2a00:79e1:abc:6f02:b7aa:ff3c:9220:595c -> 192.0.0.4 52(v4-wlan0)
    BPF egress map: iif(iface) v4Addr -> v6Addr nat64Prefix oif(iface)
      52(v4-wlan0) 192.0.0.4 -> 2a00:79e1:abc:6f02:b7aa:ff3c:9220:595c 64:ff9b::/96 47(wlan0) ether

Change-Id: I8ff77a2e3e86bfe6dbf43f4181414e444ba0da32