Merge changes from topic "vcn-fwd" am: d7d2d2a15b am: fc14eeaf35 am: 07806ad6be

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1682047

Change-Id: I745687f69366657dc33bfdacd878e06affd6a8ec

core/java/android/net/IpSecManager.java

@@ -78,6 +78,16 @@ public final class IpSecManager {
      */
     public static final int DIRECTION_OUT = 1;
 
+    /**
+     * Used when applying a transform to direct traffic through an {@link IpSecTransform} for
+     * forwarding between interfaces.
+     *
+     * <p>See {@link #applyTransportModeTransform(Socket, int, IpSecTransform)}.
+     *
+     * @hide
+     */
+    public static final int DIRECTION_FWD = 2;
+
     /**
      * The Security Parameter Index (SPI) 0 indicates an unknown or invalid index.
      *