Tell the system when tethering offload hits a limit.

Add a new tetherLimitReached method to INetworkManagementService,
and call it when the HAL notifies OffloadController because the
limit has been reached.

Bug: 29337859
Bug: 32163131
Test: builds
Test: OffloadControllerTest passes

(cherry picked from commit d66cf56ba662f10f2da1d0f844116632ad0a0dbb)

Change-Id: I89719fe7ec8bfd3c85d6cdca9c0d449aea86ef9d
Merged-In: I026e6aa9e7b371f316c0d97c3cf5e78abc1f5263

1 files changed, 15 insertions, 0 deletions

diff --git a/core/java/android/os/INetworkManagementService.aidl b/core/java/android/os/INetworkManagementService.aidl
index 3de217494ac5..316ef11f50de 100644
--- a/core/java/android/os/INetworkManagementService.aidl
+++ b/core/java/android/os/INetworkManagementService.aidl
@@ -220,6 +220,21 @@ interface INetworkManagementService
     void unregisterTetheringStatsProvider(ITetheringStatsProvider provider);
 
     /**
+     * Reports that a tethering provider has reached a data limit.
+     *
+     * Currently triggers a global alert, which causes NetworkStatsService to poll counters and
+     * re-evaluate data usage.
+     *
+     * This does not take an interface name because:
+     * 1. The tethering offload stats provider cannot reliably determine the interface on which the
+     *    limit was reached, because the HAL does not provide it.
+     * 2. Firing an interface-specific alert instead of a global alert isn't really useful since in
+     *    all cases of interest, the system responds to both in the same way - it polls stats, and
+     *    then notifies NetworkPolicyManagerService of the fact.
+     */
+    void tetherLimitReached(ITetheringStatsProvider provider);
+
+    /**
      ** PPPD
      **/