/*
- 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 include/gnunet_ats_service.h
- * @brief automatic transport selection and outbound bandwidth determination
+ This file is part of GNUnet.
+ Copyright (C) 2010-2015 GNUnet e.V.
+
+ 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., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+ */
+/**
+ * @file
+ * Automatic transport selection and outbound bandwidth determination
+ *
* @author Christian Grothoff
* @author Matthias Wachs
*
- * TODO:
- * - move GNUNET_TRANSPORT_ATS* in here and rename...
- * - extend API to express communication preferences to ATS
- * (to be called DIRECTLY from apps, not from transport/core!)
+ * @defgroup ats ATS service
+ * Automatic Transport Selection and outbound bandwidth determination
+ *
+ * @see [Documentation](https://gnunet.org/ats-subsystem)
+ *
+ * @{
*/
#ifndef GNUNET_ATS_SERVICE_H
#define GNUNET_ATS_SERVICE_H
#include "gnunet_constants.h"
#include "gnunet_util_lib.h"
-#include "gnunet_transport_service.h"
-#include "gnunet_transport_plugin.h"
+#include "gnunet_hello_lib.h"
+
+/**
+ * Types of networks (with separate quotas) we support.
+ */
+enum GNUNET_ATS_Network_Type
+{
+ /**
+ * Category of last resort.
+ */
+ GNUNET_ATS_NET_UNSPECIFIED = 0,
+
+ /**
+ * Loopback (same host).
+ */
+ GNUNET_ATS_NET_LOOPBACK = 1,
+
+ /**
+ * Local area network.
+ */
+ GNUNET_ATS_NET_LAN = 2,
+
+ /**
+ * Wide area network (i.e. Internet)
+ */
+ GNUNET_ATS_NET_WAN = 3,
+
+ /**
+ * Wireless LAN (i.e. 802.11abgn)
+ */
+ GNUNET_ATS_NET_WLAN = 4,
+ /**
+ * Bluetooth LAN
+ */
+ GNUNET_ATS_NET_BT = 5
/**
- * Handle to the ATS subsystem.
+ * Number of network types supported by ATS
*/
-struct GNUNET_ATS_Handle;
+#define GNUNET_ATS_NetworkTypeCount 6
+};
+
+
+/**
+ * Default bandwidth assigned to a network : 64 KB/s
+ */
+#define GNUNET_ATS_DefaultBandwidth 65536
+
+/**
+ * Undefined value for an `enum GNUNET_ATS_Property`
+ */
+#define GNUNET_ATS_VALUE_UNDEFINED UINT32_MAX
/**
- * Signature of a function called by ATS to notify the callee that the
- * assigned bandwidth or address for a given peer was changed. If the
- * callback is called with address/bandwidth assignments of zero, the
- * ATS disconnect function will still be called once the disconnect
- * actually happened.
+ * String representation for GNUNET_ATS_VALUE_UNDEFINED
+ */
+#define GNUNET_ATS_VALUE_UNDEFINED_STR "undefined"
+
+/**
+ * Maximum bandwidth assigned to a network : 4095 MB/s
+ */
+#define GNUNET_ATS_MaxBandwidth UINT32_MAX
+
+/**
+ * Textual equivalent for GNUNET_ATS_MaxBandwidth
+ */
+#define GNUNET_ATS_MaxBandwidthString "unlimited"
+
+
+/**
+ * ATS performance characteristics for an address.
+ */
+struct GNUNET_ATS_Properties
+{
+
+ /**
+ * Delay. Time between when the time packet is sent and the packet
+ * arrives. FOREVER if we did not measure yet.
+ */
+ struct GNUNET_TIME_Relative delay;
+
+ /**
+ * Actual traffic on this connection from this peer to the other peer.
+ * Includes transport overhead.
+ *
+ * Unit: [bytes/second]
+ */
+ uint32_t utilization_out;
+
+ /**
+ * Actual traffic on this connection from the other peer to this peer.
+ * Includes transport overhead.
+ *
+ * Unit: [bytes/second]
+ */
+ uint32_t utilization_in;
+
+ /**
+ * Distance on network layer (required for distance-vector routing)
+ * in hops. Zero for direct connections (i.e. plain TCP/UDP).
+ */
+ unsigned int distance;
+
+ /**
+ * Which network scope does the respective address belong to?
+ * This property does not change.
+ */
+ enum GNUNET_ATS_Network_Type scope;
+
+};
+
+
+/**
+ * ATS performance characteristics for an address in
+ * network byte order (for IPC).
+ */
+struct GNUNET_ATS_PropertiesNBO
+{
+
+ /**
+ * Actual traffic on this connection from this peer to the other peer.
+ * Includes transport overhead.
+ *
+ * Unit: [bytes/second]
+ */
+ uint32_t utilization_out GNUNET_PACKED;
+
+ /**
+ * Actual traffic on this connection from the other peer to this peer.
+ * Includes transport overhead.
+ *
+ * Unit: [bytes/second]
+ */
+ uint32_t utilization_in GNUNET_PACKED;
+
+ /**
+ * Which network scope does the respective address belong to?
+ * This property does not change.
+ */
+ uint32_t scope GNUNET_PACKED;
+
+ /**
+ * Distance on network layer (required for distance-vector routing)
+ * in hops. Zero for direct connections (i.e. plain TCP/UDP).
+ */
+ uint32_t distance GNUNET_PACKED;
+
+ /**
+ * Delay. Time between when the time packet is sent and the packet
+ * arrives. FOREVER if we did not measure yet.
+ */
+ struct GNUNET_TIME_RelativeNBO delay;
+
+};
+
+
+
+/* ********************* LAN Characterization library ************************ */
+/* Note: these functions do not really communicate with the ATS service */
+
+
+/**
+ * Convert ATS properties from host to network byte order.
*
- * @param cls closure
- * @param peer identity of the peer
- * @param plugin_name name of the transport plugin, NULL to disconnect
- * @param session session to use (if available)
- * @param plugin_addr address to use (if available)
- * @param plugin_addr_len number of bytes in addr
- * @param bandwidth assigned outbound bandwidth for the connection
- */
-typedef void (*GNUNET_TRANSPORT_ATS_AllocationNotification) (void *cls,
- const struct
- GNUNET_PeerIdentity
- * peer,
- const char
- *plugin_name,
- struct Session *
- session,
- const void
- *plugin_addr,
- size_t
- plugin_addr_len,
- struct
- GNUNET_BANDWIDTH_Value32NBO
- bandwidth);
-
-
-/**
- * Initialize the ATS subsystem.
+ * @param nbo[OUT] value written
+ * @param hbo value read
+ */
+void
+GNUNET_ATS_properties_hton (struct GNUNET_ATS_PropertiesNBO *nbo,
+ const struct GNUNET_ATS_Properties *hbo);
+
+
+/**
+ * Convert ATS properties from network to host byte order.
*
- * @param cfg configuration to use
- * @param alloc_cb notification to call whenever the allocation changed
- * @param alloc_cb_cls closure for 'alloc_cb'
- * @return ats context
+ * @param hbo[OUT] value written
+ * @param nbo value read
*/
-struct GNUNET_ATS_Handle *GNUNET_ATS_init (const struct
- GNUNET_CONFIGURATION_Handle *cfg,
- GNUNET_TRANSPORT_ATS_AllocationNotification
- alloc_cb, void *alloc_cb_cls);
+void
+GNUNET_ATS_properties_ntoh (struct GNUNET_ATS_Properties *hbo,
+ const struct GNUNET_ATS_PropertiesNBO *nbo);
+
/**
- * Shutdown the ATS subsystem.
+ * Convert a `enum GNUNET_ATS_Network_Type` to a string
*
- * @param atc handle
+ * @param net the network type
+ * @return a string or NULL if invalid
*/
-void GNUNET_ATS_shutdown (struct GNUNET_ATS_Handle *atc);
+const char *
+GNUNET_ATS_print_network_type (enum GNUNET_ATS_Network_Type net);
/**
- * Signature of a function that takes an address suggestion
+ * Handle for the LAN Characterization library.
+ */
+struct GNUNET_ATS_InterfaceScanner;
+
+
+/**
+ * Returns where the address is located: loopback, LAN or WAN.
*
- * @param cls closure
- * @param peer identity of the new peer
- * @param plugin_name name of the plugin, NULL if we have no suggestion
- * @param plugin_addr suggested address, NULL if we have no suggestion
- * @param plugin_addr_len number of bytes in plugin_addr
- * @param bandwidth assigned outbound bandwidth for the connection
- * @param ats performance data for the address (as far as known)
- * @param ats_count number of performance records in 'ats'
+ * @param is handle from #GNUNET_ATS_interface_scanner_init()
+ * @param addr address
+ * @param addrlen address length
+ * @return type of the network the address belongs to
*/
-typedef void (*GNUNET_ATS_AddressSuggestionCallback) (void *cls,
- const struct
- GNUNET_PeerIdentity *
- peer,
- const char *plugin_name,
- const void *plugin_addr,
- size_t plugin_addr_len,
- struct
- GNUNET_BANDWIDTH_Value32NBO
- bandwidth,
- const struct
- GNUNET_TRANSPORT_ATS_Information
- * ats,
- uint32_t ats_count);
+enum GNUNET_ATS_Network_Type
+GNUNET_ATS_scanner_address_get_type (struct GNUNET_ATS_InterfaceScanner *is,
+ const struct sockaddr *addr,
+ socklen_t addrlen);
/**
- * Handle to cancel suggestion request.
+ * Initialize the ATS address characterization client handle.
+ *
+ * @return scanner handle, NULL on error
*/
-struct GNUNET_ATS_SuggestionContext;
+struct GNUNET_ATS_InterfaceScanner *
+GNUNET_ATS_scanner_init (void);
/**
- * We would like to establish a new connection with a peer.
- * ATS should suggest a good address to begin with.
+ * Terminate interface scanner.
*
- * @param atc handle
- * @param peer identity of the new peer
- * @param cb function to call with the address
- * @param cb_cls closure for cb
+ * @param is scanner we are done with
*/
-struct GNUNET_ATS_SuggestionContext *GNUNET_ATS_suggest_address (struct
- GNUNET_ATS_Handle
- *atc,
- const struct
- GNUNET_PeerIdentity
- *peer,
- GNUNET_ATS_AddressSuggestionCallback
- cb,
- void *cb_cls);
+void
+GNUNET_ATS_scanner_done (struct GNUNET_ATS_InterfaceScanner *is);
+
+
+
+/* ********************Connection Suggestion API ***************************** */
+
+/**
+ * Handle to the ATS subsystem for making suggestions about
+ * connections the peer would like to have.
+ */
+struct GNUNET_ATS_ConnectivityHandle;
+
+/**
+ * Handle for address suggestion requests.
+ */
+struct GNUNET_ATS_ConnectivitySuggestHandle;
/**
- * Cancel suggestion request.
+ * Initialize the ATS connectivity suggestion client handle.
*
- * @param asc handle of the request to cancel
+ * @param cfg configuration to use
+ * @return ats connectivity handle, NULL on error
+ */
+struct GNUNET_ATS_ConnectivityHandle *
+GNUNET_ATS_connectivity_init (const struct GNUNET_CONFIGURATION_Handle *cfg);
+
+
+/**
+ * Shutdown ATS connectivity suggestion client.
+ *
+ * @param ch handle to destroy
*/
void
-GNUNET_ATS_suggest_address_cancel (struct GNUNET_ATS_SuggestionContext *asc);
+GNUNET_ATS_connectivity_done (struct GNUNET_ATS_ConnectivityHandle *ch);
/**
- * We established a new connection with a peer (for example, because
- * core asked for it or because the other peer connected to us).
- * Calculate bandwidth assignments including the new peer.
+ * We would like to establish a new connection with a peer. ATS
+ * should suggest a good address to begin with.
*
- * @param atc handle
- * @param peer identity of the new peer
- * @param plugin_name name of the currently used transport plugin
- * @param session session in use (if available)
- * @param plugin_addr address in use (if available)
- * @param plugin_addr_len number of bytes in plugin_addr
- * @param ats performance data for the connection
- * @param ats_count number of performance records in 'ats'
+ * @param ch handle
+ * @param peer identity of the peer we need an address for
+ * @param strength how urgent is the need for such a suggestion
+ * @return suggestion handle, NULL if request is already pending
+ */
+struct GNUNET_ATS_ConnectivitySuggestHandle *
+GNUNET_ATS_connectivity_suggest (struct GNUNET_ATS_ConnectivityHandle *ch,
+ const struct GNUNET_PeerIdentity *peer,
+ uint32_t strength);
+
+
+/**
+ * We no longer care about being connected to a peer.
+ *
+ * @param sh handle
*/
void
-GNUNET_ATS_peer_connect (struct GNUNET_ATS_Handle *atc,
- const struct GNUNET_PeerIdentity *peer,
- const char *plugin_name,
- struct Session *session,
- const void *plugin_addr,
- size_t plugin_addr_len,
- const struct GNUNET_TRANSPORT_ATS_Information *ats,
- uint32_t ats_count);
+GNUNET_ATS_connectivity_suggest_cancel (struct GNUNET_ATS_ConnectivitySuggestHandle *sh);
+
+
+/* ******************************** Scheduling API ***************************** */
+
+/**
+ * Handle to the ATS subsystem for bandwidth/transport scheduling information.
+ */
+struct GNUNET_ATS_SchedulingHandle;
+
+/**
+ * Opaque session handle, defined by plugins. Contents not known to ATS.
+ */
+struct GNUNET_ATS_Session;
/**
- * We disconnected from the given peer (for example, because ats, core
- * or blacklist asked for it or because the other peer disconnected).
- * Calculate bandwidth assignments without the peer.
+ * Signature of a function called by ATS with the current bandwidth
+ * and address preferences as determined by ATS. If our connection
+ * to ATS dies and thus all suggestions become invalid, this function
+ * is called ONCE with all arguments (except @a cls) being NULL/0.
*
- * @param atc handle
- * @param peer identity of the peer
+ * @param cls closure
+ * @param peer for which we suggest an address, NULL if ATS connection died
+ * @param address suggested address (including peer identity of the peer),
+ * may be NULL to signal disconnect from peer
+ * @param session session to use, NULL to establish a new outgoing session
+ * @param bandwidth_out assigned outbound bandwidth for the connection,
+ * 0 to signal disconnect
+ * @param bandwidth_in assigned inbound bandwidth for the connection,
+ * 0 to signal disconnect
+ */
+typedef void
+(*GNUNET_ATS_AddressSuggestionCallback) (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_ATS_Session *session,
+ struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
+ struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in);
+
+
+/**
+ * Initialize the ATS scheduling subsystem.
+ *
+ * @param cfg configuration to use
+ * @param suggest_cb notification to call whenever the suggestation changed
+ * @param suggest_cb_cls closure for @a suggest_cb
+ * @return ats context
+ */
+struct GNUNET_ATS_SchedulingHandle *
+GNUNET_ATS_scheduling_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ GNUNET_ATS_AddressSuggestionCallback suggest_cb,
+ void *suggest_cb_cls);
+
+
+/**
+ * Client is done with ATS scheduling, release resources.
+ *
+ * @param sh handle to release
*/
void
-GNUNET_ATS_peer_disconnect (struct GNUNET_ATS_Handle *atc,
- const struct GNUNET_PeerIdentity *peer);
+GNUNET_ATS_scheduling_done (struct GNUNET_ATS_SchedulingHandle *sh);
/**
- * A session got destroyed, stop including it as a valid address.
+ * Handle used within ATS to track an address.
+ */
+struct GNUNET_ATS_AddressRecord;
+
+
+/**
+ * We have a new address ATS should know. Addresses have to be added with this
+ * function before they can be: updated, set in use and destroyed
+ *
+ * @param sh handle
+ * @param address the address
+ * @param session session handle (if available, i.e. for incoming connections)
+ * @param prop performance data for the address
+ * @return handle to the address representation inside ATS, NULL
+ * on error (i.e. ATS knows this exact address already, or
+ * address is invalid)
+ */
+struct GNUNET_ATS_AddressRecord *
+GNUNET_ATS_address_add (struct GNUNET_ATS_SchedulingHandle *sh,
+ const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_ATS_Session *session,
+ const struct GNUNET_ATS_Properties *prop);
+
+
+/**
+ * An address was used to initiate a session.
*
- * @param atc handle
- * @param peer identity of the peer
- * @param session session handle that is no longer valid
+ * @param ar address record to update information for
+ * @param session session handle
*/
void
-GNUNET_ATS_session_destroyed (struct GNUNET_ATS_Handle *atc,
- const struct GNUNET_PeerIdentity *peer,
- const struct Session *session);
+GNUNET_ATS_address_add_session (struct GNUNET_ATS_AddressRecord *ar,
+ struct GNUNET_ATS_Session *session);
+
+
+/**
+ * A @a session was destroyed, disassociate it from the given address
+ * record. If this was an incoming addess, destroys the address as
+ * well.
+ *
+ * @param ar address record to update information for
+ * @param session session handle
+ * @return #GNUNET_YES if the @a ar was destroyed because
+ * it was an incoming address,
+ * #GNUNET_NO if the @ar was kept because we can
+ * use it still to establish a new session
+ */
+int
+GNUNET_ATS_address_del_session (struct GNUNET_ATS_AddressRecord *ar,
+ struct GNUNET_ATS_Session *session);
/**
* We have updated performance statistics for a given address. Note
* that this function can be called for addresses that are currently
* in use as well as addresses that are valid but not actively in use.
- * Furthermore, the peer may not even be connected to us right now (in
- * which case the call may be ignored or the information may be stored
- * for later use). Update bandwidth assignments.
- *
- * @param atc handle
- * @param peer identity of the new peer
- * @param valid_until how long is the address valid?
- * @param plugin_name name of the transport plugin
- * @param session session handle (if available)
- * @param plugin_addr address (if available)
- * @param plugin_addr_len number of bytes in plugin_addr
- * @param ats performance data for the address
- * @param ats_count number of performance records in 'ats'
+ * Furthermore, the peer may not even be connected to us right now (@a
+ * session value of NULL used to signal disconnect, or somehow we
+ * otherwise got updated on @a ats information). Based on the
+ * information provided, ATS may update bandwidth assignments and
+ * suggest to switch addresses.
+ *
+ * @param ar address record to update information for
+ * @param prop performance data for the address
*/
void
-GNUNET_ATS_address_update (struct GNUNET_ATS_Handle *atc,
- const struct GNUNET_PeerIdentity *peer,
- struct GNUNET_TIME_Absolute valid_until,
- const char *plugin_name,
- struct Session *session,
- const void *plugin_addr,
- size_t plugin_addr_len,
- const struct GNUNET_TRANSPORT_ATS_Information *ats,
- uint32_t ats_count);
+GNUNET_ATS_address_update (struct GNUNET_ATS_AddressRecord *ar,
+ const struct GNUNET_ATS_Properties *prop);
+
+/**
+ * An address got destroyed, stop using it as a valid address.
+ *
+ * @param ar address record to destroy, it's validation has
+ * expired and ATS may no longer use it
+ */
+void
+GNUNET_ATS_address_destroy (struct GNUNET_ATS_AddressRecord *ar);
+
+
+
+/* ******************************** Performance API ***************************** */
+
+/**
+ * ATS Handle to obtain and/or modify performance information.
+ */
+struct GNUNET_ATS_PerformanceHandle;
+
+/**
+ * Signature of a function that is called with QoS information about an address.
+ *
+ * @param cls closure
+ * @param address the address, NULL if ATS service was disconnected or
+ * when the iteration is completed in the case of
+ * #GNUNET_ATS_performance_list_addresses()
+ * @param address_active #GNUNET_YES if this address is actively used
+ * to maintain a connection to a peer;
+ * #GNUNET_NO if the address is not actively used;
+ * #GNUNET_SYSERR if this address is no longer available for ATS
+ * @param bandwidth_out assigned outbound bandwidth for the connection
+ * @param bandwidth_in assigned inbound bandwidth for the connection
+ * @param prop performance data for the address
+ */
+typedef void
+(*GNUNET_ATS_AddressInformationCallback) (void *cls,
+ const struct GNUNET_HELLO_Address *address,
+ int address_active,
+ struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
+ struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
+ const struct GNUNET_ATS_Properties *prop);
+
+
+/**
+ * Handle for an address listing operation
+ */
+struct GNUNET_ATS_AddressListHandle;
+
+
+/**
+ * Get handle to access performance API of the ATS subsystem.
+ *
+ * @param cfg configuration to use
+ * @param addr_info_cb callback called when performance characteristics for
+ * an address change
+ * @param addr_info_cb_cls closure for @a addr_info_cb
+ * @return ats performance context
+ */
+struct GNUNET_ATS_PerformanceHandle *
+GNUNET_ATS_performance_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ GNUNET_ATS_AddressInformationCallback addr_info_cb,
+ void *addr_info_cb_cls);
+
+
+/**
+ * Get information about addresses known to the ATS subsystem.
+ *
+ * @param ph the performance handle to use
+ * @param peer peer idm can be NULL for all peers
+ * @param all #GNUNET_YES to get information about all addresses or #GNUNET_NO to
+ * get only address currently used
+ * @param infocb callback to call with the addresses,
+ * will callback with address == NULL when done
+ * @param infocb_cls closure for @a infocb
+ * @return handle to abort the operation
+ */
+struct GNUNET_ATS_AddressListHandle *
+GNUNET_ATS_performance_list_addresses (struct GNUNET_ATS_PerformanceHandle *ph,
+ const struct GNUNET_PeerIdentity *peer,
+ int all,
+ GNUNET_ATS_AddressInformationCallback infocb,
+ void *infocb_cls);
+
+
+/**
+ * Cancel a pending address listing operation
+ *
+ * @param alh the `struct GNUNET_ATS_AddressListHandle` handle to cancel
+ */
+void
+GNUNET_ATS_performance_list_addresses_cancel (struct GNUNET_ATS_AddressListHandle *alh);
+
+
+/**
+ * Client is done using the ATS performance subsystem, release resources.
+ *
+ * @param ph handle
+ */
+void
+GNUNET_ATS_performance_done (struct GNUNET_ATS_PerformanceHandle *ph);
+
+
+/**
+ * Function called with reservation result.
+ *
+ * @param cls closure
+ * @param peer identifies the peer
+ * @param amount set to the amount that was actually reserved or unreserved;
+ * either the full requested amount or zero (no partial reservations)
+ * @param res_delay if the reservation could not be satisfied (amount was 0), how
+ * long should the client wait until re-trying?
+ */
+typedef void
+(*GNUNET_ATS_ReservationCallback) (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ int32_t amount,
+ struct GNUNET_TIME_Relative res_delay);
+
+
+/**
+ * Context that can be used to cancel a peer information request.
+ */
+struct GNUNET_ATS_ReservationContext;
+
+
+/**
+ * Reserve inbound bandwidth from the given peer. ATS will look at
+ * the current amount of traffic we receive from the peer and ensure
+ * that the peer could add 'amount' of data to its stream.
+ *
+ * @param ph performance handle
+ * @param peer identifies the peer
+ * @param amount reserve N bytes for receiving, negative
+ * amounts can be used to undo a (recent) reservation;
+ * @param rcb function to call with the resulting reservation information
+ * @param rcb_cls closure for @a rcb
+ * @return NULL on error
+ * @deprecated will be replaced soon
+ */
+struct GNUNET_ATS_ReservationContext *
+GNUNET_ATS_reserve_bandwidth (struct GNUNET_ATS_PerformanceHandle *ph,
+ const struct GNUNET_PeerIdentity *peer,
+ int32_t amount,
+ GNUNET_ATS_ReservationCallback rcb,
+ void *rcb_cls);
+
+
+/**
+ * Cancel request for reserving bandwidth.
+ *
+ * @param rc context returned by the original GNUNET_ATS_reserve_bandwidth call
+ */
+void
+GNUNET_ATS_reserve_bandwidth_cancel (struct GNUNET_ATS_ReservationContext *rc);
+
+
+/**
+ * ATS preference types as array initializer
+ */
+#define GNUNET_ATS_PreferenceType {GNUNET_ATS_PREFERENCE_BANDWIDTH, GNUNET_ATS_PREFERENCE_LATENCY, GNUNET_ATS_PREFERENCE_END}
+
+/**
+ * ATS preference types as string array initializer
+ */
+#define GNUNET_ATS_PreferenceTypeString {"BANDWIDTH", "LATENCY", "END" }
+
+/**
+ * Enum defining all known preference categories.
+ */
+enum GNUNET_ATS_PreferenceKind
+{
+
+ /**
+ * Change the peer's bandwidth value (value per byte of bandwidth in
+ * the goal function) to the given amount. The argument is followed
+ * by a double value giving the desired value (can be negative).
+ * Preference changes are forgotten if peers disconnect.
+ */
+ GNUNET_ATS_PREFERENCE_BANDWIDTH = 0,
+
+ /**
+ * Change the peer's latency value to the given amount. The
+ * argument is followed by a double value giving the desired value
+ * (can be negative). The absolute score in the goal function is
+ * the inverse of the latency in microseconds (minimum: 1
+ * microsecond) multiplied by the latency preferences.
+ */
+ GNUNET_ATS_PREFERENCE_LATENCY = 1,
+
+ /**
+ * End of preference list.
+ */
+ GNUNET_ATS_PREFERENCE_END = 2
+
+};
+
+
+/**
+ * Convert a GNUNET_ATS_PreferenceType to a string
+ *
+ * @param type the preference type
+ * @return a string or NULL if invalid
+ */
+const char *
+GNUNET_ATS_print_preference_type (enum GNUNET_ATS_PreferenceKind type);
+
+
+/**
+ * Change preferences for the given peer. Preference changes are forgotten if peers
+ * disconnect.
+ *
+ * @param ph performance handle @param peer identifies the peer
+ * @param ... #GNUNET_ATS_PREFERENCE_END-terminated specification of the
+ * desired changes
+ */
+void
+GNUNET_ATS_performance_change_preference (struct GNUNET_ATS_PerformanceHandle *ph,
+ const struct GNUNET_PeerIdentity *peer,
+ ...);
+
+
+/**
+ * Application feedback on how good preference requirements are fulfilled
+ * for the preferences included in the given time scope [now - scope .. now]
+ *
+ * An application notifies ATS if (and only if) it has feedback information
+ * for specific properties. This values are valid until the feedback scores are
+ * updated by the application.
+ *
+ * If the application has no feedback for this preference kind the application
+ * will not explicitly call for this property and will not include it in this
+ * function call.
+ *
+ * @param ph performance handle
+ * @param scope the time interval this valid for: [now - scope .. now]
+ * @param peer identifies the peer
+ * @param ... #GNUNET_ATS_PREFERENCE_END-terminated specification of the desired changes
+ */
+void
+GNUNET_ATS_performance_give_feedback (struct GNUNET_ATS_PerformanceHandle *ph,
+ const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_TIME_Relative scope,
+ ...);
#endif
+
+/** @} */ /* end of group */
+
/* end of file gnunet-service-transport_ats.h */