commit 01f243f5a83cfc032db56993f4661b6a253b1fe1
author Paul Hu <paulhu@google.com> Wed Nov 22 17:26:36 2023 +0800
committer Paul Hu <paulhu@google.com> Tue Dec 19 02:18:53 2023 +0000
tree 9b1024d170ecff7feffd713419c016e59aaf1d46
parent 19d055514c1d4753cb3b22af0b9564bfe7f42f6e

Support mDns Known-Answer Suppression

Support the RFC 6762 section 7.1. Known-Answer Suppression.
If the response contains an answer that is also present in the
answer section and the known-answer's TTL is greater than half
of the original TTL, suppress the response.

Bug: 312657709
Test: atest FrameworksNetTests NsdManagerTest
      Passed DUPLICAE SUPPRESSION test case of BCT
Change-Id: I1890e9fba068c1f59a1d93c3514f0e7d07da1814

service-t/src/com/android/server/NsdService.java

diff --git a/service-t/src/com/android/server/NsdService.java b/service-t/src/com/android/server/NsdService.java
index 9c01dda..2ac2b18 100644
--- a/service-t/src/com/android/server/NsdService.java
+++ b/service-t/src/com/android/server/NsdService.java
@@ -1702,6 +1702,8 @@
                         mContext, MdnsFeatureFlags.NSD_EXPIRED_SERVICES_REMOVAL))
                 .setIsLabelCountLimitEnabled(mDeps.isTetheringFeatureNotChickenedOut(
                         mContext, MdnsFeatureFlags.NSD_LIMIT_LABEL_COUNT))
+                .setIsKnownAnswerSuppressionEnabled(mDeps.isFeatureEnabled(
+                        mContext, MdnsFeatureFlags.NSD_KNOWN_ANSWER_SUPPRESSION))
                 .build();
         mMdnsSocketClient =
                 new MdnsMultinetworkSocketClient(handler.getLooper(), mMdnsSocketProvider,