Add ICMPv6 ND header length constants. am: 10ff3ebeef am: 7a969bff50

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/1737505

Change-Id: Iafb360fe4efa8c52d32f4aa6d1e090f7504cbe78
diff --git a/staticlibs/framework/com/android/net/module/util/NetworkStackConstants.java b/staticlibs/framework/com/android/net/module/util/NetworkStackConstants.java
index b7062e7..f7151d7 100644
--- a/staticlibs/framework/com/android/net/module/util/NetworkStackConstants.java
+++ b/staticlibs/framework/com/android/net/module/util/NetworkStackConstants.java
@@ -148,7 +148,10 @@
     public static final int ICMPV6_ND_OPTION_RDNSS = 25;
     public static final int ICMPV6_ND_OPTION_PREF64 = 38;
 
+    public static final int ICMPV6_RS_HEADER_LEN = 8;
     public static final int ICMPV6_RA_HEADER_LEN = 16;
+    public static final int ICMPV6_NS_HEADER_LEN = 24;
+    public static final int ICMPV6_NA_HEADER_LEN = 24;
 
     public static final int NEIGHBOR_ADVERTISEMENT_FLAG_ROUTER    = 1 << 31;
     public static final int NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED = 1 << 30;