Index: java/net/NetworkInterface.java
===================================================================
--- java/net/NetworkInterface.java.orig	2006-12-18 22:37:39.000000000 +0100
+++ java/net/NetworkInterface.java	2008-06-06 14:00:44.000000000 +0200
@@ -1,5 +1,5 @@
 /* NetworkInterface.java --
-   Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2008 Free Software Foundation, Inc.
 
 This file is part of GNU Classpath.
 
@@ -265,4 +265,50 @@
 
     return result.toString();
   }
+
+  /**
+   * Determines whether this interface is ready to transfer data.
+   *
+   * @return whether the interface is up
+  */
+  public boolean isUp()
+    throws SocketException
+  {
+    return VMNetworkInterface.isUp(netif.name);
+  }
+
+  /**
+   * Determines whether this interface does point to point
+   * transmission.
+   *
+   * @return whether the interface does point to point transmission
+  */
+  public boolean isPointToPoint()
+    throws SocketException
+  {
+    return VMNetworkInterface.isPointToPoint(netif.name);
+  }
+
+  /**
+   * Determines whether this interface is the loopback interface.
+   *
+   * @return whether the interface is the loopback interface
+  */
+  public boolean isLoopback()
+    throws SocketException
+  {
+    return VMNetworkInterface.isLoopback(netif.name);
+  }
+
+  /**
+   * Determines whether this interface supports multicast transmission.
+   *
+   * @return whether the interface supports multicast transmission.
+  */
+  public boolean supportsMulticast()
+    throws SocketException
+  {
+    return VMNetworkInterface.supportsMulticast(netif.name);
+  }
+
 }
Index: vm/reference/java/net/VMNetworkInterface.java
===================================================================
--- vm/reference/java/net/VMNetworkInterface.java.orig	2006-12-18 22:37:39.000000000 +0100
+++ vm/reference/java/net/VMNetworkInterface.java	2008-06-06 14:00:44.000000000 +0200
@@ -1,5 +1,5 @@
 /* VMNetworkInterface.java --
-   Copyright (C) 2005  Free Software Foundation, Inc.
+   Copyright (C) 2005, 2008  Free Software Foundation, Inc.
 
 This file is part of GNU Classpath.
 
@@ -119,4 +119,13 @@
     else
       throw new SocketException("invalid interface address");
   }
+
+  static native boolean isUp(String name) throws SocketException;
+
+  static native boolean isLoopback(String name) throws SocketException;
+
+  static native boolean isPointToPoint(String name) throws SocketException;
+
+  static native boolean supportsMulticast(String name) throws SocketException;
+
 }
Index: native/jni/java-net/java_net_VMNetworkInterface.c
===================================================================
--- native/jni/java-net/java_net_VMNetworkInterface.c.orig	2007-04-05 14:34:19.000000000 +0200
+++ native/jni/java-net/java_net_VMNetworkInterface.c	2008-06-06 14:00:44.000000000 +0200
@@ -1,5 +1,5 @@
 /* VMNetworkInterface.c - Native methods for NetworkInterface class
-   Copyright (C) 2003, 2005, 2006  Free Software Foundation, Inc.
+   Copyright (C) 2003, 2005, 2006, 2008 Free Software Foundation, Inc.
 
 This file is part of GNU Classpath.
 
@@ -50,11 +50,18 @@
 #include <stdio.h>
 #include <string.h>
 
+#include <net/if.h>
+#include <sys/ioctl.h>
+
 #include <jni.h>
 #include <jcl.h>
 
+#include <cpnative.h>
+#include <cpnet.h>
+
 #include "java_net_VMNetworkInterface.h"
 
+int iff_flags(JNIEnv *, jstring, jint *);
 
 static jmethodID java_net_VMNetworkInterface_init;
 static jmethodID java_net_VMNetworkInterface_addAddress;
@@ -251,4 +258,136 @@
 #endif /* HAVE_IFADDRS_H && HAVE_GETIFADDRS */
 }
 
+int iff_flags(JNIEnv *env, jstring name, jint *flags)
+{
+  struct ifreq iff;
+  const char *iff_name;
+  jint socket;
+  int error, retval;
+
+  if ((error = cpnet_openSocketDatagram(env, &socket, AF_INET)))
+  {
+    return error;
+  }
+
+  iff_name = JCL_jstring_to_cstring(env, name);
+  memset(&iff, 0, sizeof(iff));
+  strcpy(iff.ifr_name, iff_name);
+ 
+  if (ioctl(socket, SIOCGIFFLAGS, &iff) >= 0)
+  {
+    *flags = (jint) iff.ifr_flags;
+
+    retval = 0;
+  }
+  else
+  {
+    retval = errno;
+  }
+
+  cpnet_close(env, socket);
+
+  JCL_free_cstring(env, name, iff_name);
+
+  return retval;
+}
+
+JNIEXPORT jboolean JNICALL
+Java_java_net_VMNetworkInterface_isUp (JNIEnv *env, jclass class UNUSED,
+                                       jstring name)
+{
+  jint flags;
+  int error;
+  jboolean retval;
+
+  if ((error = iff_flags(env, name, &flags)))
+  {
+    JCL_ThrowException(env, "java/net/SocketException",
+                       cpnative_getErrorString(error));
+
+    retval = JNI_FALSE;
+  }
+  else
+  {
+    retval = (flags & (IFF_UP | IFF_RUNNING))
+             ? JNI_TRUE
+             : JNI_FALSE;
+  }
+
+  return retval;
+}
+
+JNIEXPORT jboolean JNICALL
+Java_java_net_VMNetworkInterface_isPointToPoint (JNIEnv *env,
+                                                 jclass class UNUSED,
+                                                 jstring name)
+{
+  jint flags;
+  int error;
+  jboolean retval;
+
+  if ((error = iff_flags(env, name, &flags)))
+  {
+    JCL_ThrowException(env, "java/net/SocketException",
+                       cpnative_getErrorString(error));
+
+    retval = JNI_FALSE;
+  }
+  else
+  {
+    retval = (flags & IFF_POINTOPOINT) ? JNI_TRUE
+                                       : JNI_FALSE;
+  }
+
+  return retval;
+}
+
+JNIEXPORT jboolean JNICALL
+Java_java_net_VMNetworkInterface_isLoopback (JNIEnv *env,
+                                             jclass class UNUSED,
+                                             jstring name)
+{
+  jint flags;
+  int error;
+  jboolean retval;
+
+  if ((error = iff_flags(env, name, &flags)))
+  {
+    JCL_ThrowException(env, "java/net/SocketException",
+                       cpnative_getErrorString(error));
+
+    retval = JNI_FALSE;
+  }
+  else
+  {
+    retval = (flags & IFF_LOOPBACK) ? JNI_TRUE : JNI_FALSE;
+  }
+
+  return retval;
+}
+
+JNIEXPORT jboolean JNICALL
+Java_java_net_VMNetworkInterface_supportsMulticast (JNIEnv *env,
+                                                    jclass class UNUSED,
+                                                    jstring name)
+{
+  jint flags;
+  int error;
+  jboolean retval;
+
+  if ((error = iff_flags(env, name, &flags)))
+  {
+    JCL_ThrowException(env, "java/net/SocketException",
+                       cpnative_getErrorString(error));
+
+    retval = JNI_FALSE;
+  }
+  else
+  {
+    retval = (flags & IFF_MULTICAST) ? JNI_TRUE : JNI_FALSE;
+  }
+
+  return retval;
+}
+
 /* end of file */
Index: include/java_net_VMNetworkInterface.h
===================================================================
--- include/java_net_VMNetworkInterface.h.orig	2008-06-06 14:21:27.000000000 +0200
+++ include/java_net_VMNetworkInterface.h	2008-06-06 14:22:12.000000000 +0200
@@ -12,6 +12,10 @@
 
 JNIEXPORT void JNICALL Java_java_net_VMNetworkInterface_initIds (JNIEnv *env, jclass);
 JNIEXPORT jobjectArray JNICALL Java_java_net_VMNetworkInterface_getVMInterfaces (JNIEnv *env, jclass);
+JNIEXPORT jboolean JNICALL Java_java_net_VMNetworkInterface_isUp (JNIEnv *env, jclass, jstring);
+JNIEXPORT jboolean JNICALL Java_java_net_VMNetworkInterface_isLoopback (JNIEnv *env, jclass, jstring);
+JNIEXPORT jboolean JNICALL Java_java_net_VMNetworkInterface_isPointToPoint (JNIEnv *env, jclass, jstring);
+JNIEXPORT jboolean JNICALL Java_java_net_VMNetworkInterface_supportsMulticast (JNIEnv *env, jclass, jstring);
 
 #ifdef __cplusplus
 }