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diff --git a/src/transport/gnunet-service-transport_validation.h b/src/transport/gnunet-service-transport_validation.h
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+/*
+     This file is part of GNUnet.
+     (C) 2010,2011 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file transport/gnunet-service-transport_validation.h
+ * @brief address validation API
+ * @author Christian Grothoff
+ */
+#ifndef GNUNET_SERVICE_TRANSPORT_VALIDATION_H
+#define GNUNET_SERVICE_TRANSPORT_VALIDATION_H
+
+#include "gnunet_statistics_service.h"
+#include "gnunet_transport_plugin.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_hello_lib.h"
+
+
+/**
+ * Start the validation subsystem.
+ */
+void
+GST_validation_start (void);
+
+
+/**
+ * Stop the validation subsystem.
+ */
+void
+GST_validation_stop (void);
+
+
+/**
+ * Update if we are using an address for a connection actively right now.
+ * Based on this, the validation module will measure latency for the
+ * address more or less often.
+ *
+ * @param address the address
+ * @param session session
+ * @param in_use GNUNET_YES if we are now using the address for a connection,
+ *               GNUNET_NO if we are no longer using the address for a connection
+ */
+void
+GST_validation_set_address_use (const struct GNUNET_HELLO_Address *address,
+                                struct Session *session, int in_use);
+
+
+/**
+ * Query validation about the latest observed latency on a given
+ * address.
+ *
+ * @param sender peer
+ * @param address the address
+ * @param session session
+ * @return observed latency of the address, FOREVER if the address was
+ *         never successfully validated
+ */
+struct GNUNET_TIME_Relative
+GST_validation_get_address_latency (const struct GNUNET_PeerIdentity *sender,
+                                    const struct GNUNET_HELLO_Address *address,
+                                    struct Session *session);
+
+
+/**
+ * We've received a PING.  If appropriate, generate a PONG.
+ *
+ * @param sender peer sending the PING
+ * @param hdr the PING
+ * @param sender_address address of the sender, NULL if we did not initiate
+ * @param session session we got the PING from
+ */
+void
+GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
+                            const struct GNUNET_MessageHeader *hdr,
+                            const struct GNUNET_HELLO_Address *sender_address,
+                            struct Session *session);
+
+
+/**
+ * We've received a PONG.  Check if it matches a pending PING and
+ * mark the respective address as confirmed.
+ *
+ * @param sender peer sending the PONG
+ * @param hdr the PONG
+ */
+void
+GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
+                            const struct GNUNET_MessageHeader *hdr);
+
+
+/**
+ * We've received a HELLO, check which addresses are new and trigger
+ * validation.
+ *
+ * @param hello the HELLO we received
+ */
+void
+GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello);
+
+
+/**
+ * Function called for each address (or address status change) that
+ * the validation module is aware of (for the given target).
+ *
+ * @param cls closure
+ * @param public_key public key for the peer, never NULL
+ * @param valid_until is ZERO if we never validated the address,
+ *                    otherwise a time up to when we consider it (or was) valid
+ * @param validation_block  is FOREVER if the address is for an unsupported plugin (from PEERINFO)
+ *                          is ZERO if the address is considered valid (no validation needed)
+ *                          otherwise a time in the future if we're currently denying re-validation
+ * @param address the address
+ */
+typedef void (*GST_ValidationAddressCallback) (void *cls,
+                                               const struct
+                                               GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
+                                               * public_key,
+                                               struct GNUNET_TIME_Absolute
+                                               valid_until,
+                                               struct GNUNET_TIME_Absolute
+                                               validation_block,
+                                               const struct GNUNET_HELLO_Address
+                                               * address);
+
+
+/**
+ * Call the given function for each address for the given target.
+ *
+ * @param target peer information is requested for
+ * @param cb function to call; will not be called after this function returns
+ * @param cb_cls closure for 'cb'
+ */
+void
+GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
+                              GST_ValidationAddressCallback cb, void *cb_cls);
+
+
+#endif
+/* end of file gnunet-service-transport_validation.h */