Create IpPrefix in PrefixInformationOption constructor
The constructor is invoked during Struct#parse() at which point we might
as well try to create the IpPrefix object which will be used later. If
this fails for some reason (UnknownHostException or ClassCastException),
the prefix is bogus and should not be used.
Bug: 315069348
Test: TH
Change-Id: I58eda41f98b774fe97389beb1b84e164634a20d3
diff --git a/staticlibs/device/com/android/net/module/util/structs/PrefixInformationOption.java b/staticlibs/device/com/android/net/module/util/structs/PrefixInformationOption.java
index 0fc85e4..bbbe571 100644
--- a/staticlibs/device/com/android/net/module/util/structs/PrefixInformationOption.java
+++ b/staticlibs/device/com/android/net/module/util/structs/PrefixInformationOption.java
@@ -24,9 +24,13 @@
import androidx.annotation.VisibleForTesting;
import com.android.net.module.util.Struct;
+import com.android.net.module.util.Struct.Computed;
import com.android.net.module.util.Struct.Field;
import com.android.net.module.util.Struct.Type;
+import java.net.Inet6Address;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
@@ -72,6 +76,9 @@
@Field(order = 7, type = Type.ByteArray, arraysize = 16)
public final byte[] prefix;
+ @Computed
+ private final IpPrefix mIpPrefix;
+
@VisibleForTesting
public PrefixInformationOption(final byte type, final byte length, final byte prefixLen,
final byte flags, final long validLifetime, final long preferredLifetime,
@@ -84,6 +91,23 @@
this.preferredLifetime = preferredLifetime;
this.reserved = reserved;
this.prefix = prefix;
+
+ try {
+ final Inet6Address addr = (Inet6Address) InetAddress.getByAddress(prefix);
+ mIpPrefix = new IpPrefix(addr, prefixLen);
+ } catch (UnknownHostException | ClassCastException e) {
+ // UnknownHostException should never happen unless prefix is null.
+ // ClassCastException can occur when prefix is an IPv6 mapped IPv4 address.
+ // Both scenarios should throw an exception in the context of Struct#parse().
+ throw new IllegalArgumentException(e);
+ }
+ }
+
+ /**
+ * Return the prefix {@link IpPrefix} included in the PIO.
+ */
+ public IpPrefix getIpPrefix() {
+ return mIpPrefix;
}
/**