commit 1da9008a49dd7acf9ab1f1a5f727ad541c487756
author Hungming Chen <nuccachen@google.com> Fri Feb 14 20:24:16 2020 +0800
committer Maciej Żenczykowski <maze@google.com> Tue Feb 18 05:49:40 2020 +0000
tree 957d3e32a1ee9e0a3eb7bb8042410b0c24fbe88f
parent ec203383d2eb81c735677a63d888fb24a94f69aa

TetherController: attach/detach tether bpf program to upstream interface

Test: build, atest

Manual test steps:
1. Connect to FarEastone mobile
2. Enable WiFi hotspot
3. Get the upstream interface via logcat
   I netd    : ipfwdAddInterfaceForward("wlan1", "rmnet_data1")
4. Check the tether BPF program attaching on upstream interface
   $ adb shell tc filter show dev rmnet_data1 ingress
   filter protocol ipv6 pref 1 bpf
   filter protocol ipv6 pref 1 bpf handle 0x1
   prog_offload_schedcls_ingress_tether_rawip:[*fsobj] direct-action
5. Disable WiFi hotspot
6. Check the tether BPF program detaching on upstream interface by
   logcat

Change-Id: I2acca0220a660fbaa235f8863237d526828c2af8