* @brief 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!)
*/
#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"
+
+enum GNUNET_ATS_Network_Type
+{
+ GNUNET_ATS_NET_UNSPECIFIED = 0,
+ GNUNET_ATS_NET_LOOPBACK = 1,
+ GNUNET_ATS_NET_LAN = 2,
+ GNUNET_ATS_NET_WAN = 3,
+ GNUNET_ATS_NET_WLAN = 4,
+};
/**
- * Handle to the ATS subsystem.
+ * Enum defining all known property types for ATS Enum values are used
+ * in the GNUNET_ATS_Information struct as
+ * (key,value)-pairs.
+ *
+ * Cost are always stored in uint32_t, so all units used to define costs
+ * have to be normalized to fit in uint32_t [0 .. 4.294.967.295]
*/
-struct GNUNET_ATS_Handle;
+enum GNUNET_ATS_Property
+{
+
+ /**
+ * End of the array.
+ * @deprecated
+ */
+ GNUNET_ATS_ARRAY_TERMINATOR = 0,
+
+ /**
+ * Actual traffic on this connection from the other peer to this peer.
+ *
+ * Unit: [bytes/second]
+ */
+ GNUNET_ATS_UTILIZATION_UP,
+
+ /**
+ * Actual traffic on this connection from this peer to the other peer.
+ *
+ * Unit: [bytes/second]
+ */
+ GNUNET_ATS_UTILIZATION_DOWN,
+
+ /**
+ * Is this address located in WAN, LAN or a loopback address
+ * Value is element of GNUNET_ATS_Network_Type
+ */
+ GNUNET_ATS_NETWORK_TYPE,
+
+ /**
+ * Delay
+ * Time between when the time packet is sent and the packet arrives
+ *
+ * Unit: [ms]
+ *
+ * Examples:
+ *
+ * LAN : 1
+ * WLAN : 2
+ * Dialup: 500
+ */
+ GNUNET_ATS_QUALITY_NET_DELAY,
+
+ /**
+ * Distance on network layer (required for distance-vector routing).
+ *
+ * Unit: [DV-hops]
+ */
+ GNUNET_ATS_QUALITY_NET_DISTANCE,
+ /**
+ * Network overhead on WAN (Wide-Area Network)
+ *
+ * How many bytes are sent on the WAN when 1 kilobyte (1024 bytes)
+ * of application data is transmitted?
+ * A factor used with connect cost, bandwidth cost and energy cost
+ * to describe the overhead produced by the transport protocol
+ *
+ * Unit: [bytes/kb]
+ *
+ * Interpretation: less is better
+ *
+ * Examples:
+ *
+ * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
+ * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
+ * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
+ * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
+ */
+ GNUNET_ATS_COST_WAN,
+
+ /**
+ * Network overhead on LAN (Local-Area Network)
+ *
+ * How many bytes are sent on the LAN when 1 kilobyte (1024 bytes)
+ * of application data is transmitted?
+ * A factor used with connect cost, bandwidth cost and energy cost
+ * to describe the overhead produced by the transport protocol
+ *
+ * Unit: [bytes/kb]
+ *
+ * Interpretation: less is better
+ *
+ * Examples:
+ *
+ * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
+ * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
+ * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
+ * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
+ */
+ GNUNET_ATS_COST_LAN,
+
+ /**
+ * Network overhead on WLAN (Wireless Local Area Network)
+ *
+ * How many bytes are sent on the LAN when 1 kilobyte (1024 bytes)
+ * of application data is transmitted?
+ * A factor used with connect cost, bandwidth cost and energy cost
+ * to describe the overhead produced by the transport protocol
+ *
+ * Unit: [bytes/kb]
+ *
+ * Interpretation: less is better
+ *
+ * Examples:
+ *
+ * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
+ * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
+ * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
+ * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
+ */
+ GNUNET_ATS_COST_WLAN
+ /* Cost related values */
+ /* =================== */
+ /**
+ * Volume based cost in financial units to transmit data
+ *
+ * Note: This value is not bound to a specific currency or unit and only
+ * used locally.
+ * "cent" just refers the smallest amount of money in the respective
+ * currency.
+ *
+ * Unit: [cent/MB]
+ *
+ * Interpretation: less is better
+ *
+ * Examples:
+ * LAN: 0 [cent/MB]
+ * 2G : 10 [cent/MB]
+ */
+ // GNUNET_ATS_COST_FINANCIAL_PER_VOLUME = 1,
+ /**
+ * Time based cost in financial units to transmit data
+ *
+ * Note: This value is not bound to a specific currency or unit and only
+ * used locally.
+ * "cent" just refers the smallest amount of money in the respective
+ * currency.
+ *
+ * Unit: [cent/h]
+ *
+ * Interpretation: less is better
+ *
+ * Examples:
+ * LAN : 0 [cent/h]
+ * Dialup: 10 [cent/h]
+ */
+ // GNUNET_ATS_COST_FINANCIAL_PER_TIME = 2,
+ /**
+ * Computational costs
+ *
+ * Effort of preparing data to be sent with this transport
+ * Includes encoding, encryption and conversion of data
+ * Partial values can be summed up: c_sum = c_enc + c_enc + c_conv
+ * Resulting values depend on local system properties, e.g. CPU
+ *
+ * Unit: [ms/GB]
+ *
+ * Interpretation: less is better
+ *
+ * Examples:
+ *
+ * HTTPS with AES CBC-256: 7,382
+ * HTTPS with AES CBC-128: 5,279
+ * HTTPS with RC4-1024: 2,652
+ */
+ // GNUNET_ATS_COST_COMPUTATIONAL = 3,
+ /**
+ * Energy consumption
+ *
+ * Energy consumption using this transport when sending with a certain
+ * power at a certain bitrate. This is only an approximation based on:
+ * Energy consumption E = P / D
+ *
+ * with:
+ * Power P in Watt (J/s)
+ * Datarate D in MBit/s
+ *
+ * Conversion between power P and dBm used by WLAN in radiotap's dBm TX power:
+ *
+ * Lp(dbm) = 10 log10 (P/ 1mW)
+ *
+ * => P = 1 mW * 10^(Lp(dbm)/10)
+ *
+ * Unit: [mJ/MB]
+ *
+ * Interpretation: less is better
+ *
+ * Examples:
+ *
+ * LAN: 0
+ * WLAN: 89 (600 mW @ 802.11g /w 54 MBit/s)
+ * Bluetooth: 267 (100 mW @ BT2.0 EDR /w 3 MBit/s)
+ */
+ // GNUNET_ATS_COST_ENERGY_CONSUMPTION = 4,
+ /**
+ * Connect cost
+ * How many bytes are transmitted to initiate a new connection using
+ * this transport?
+ *
+ * Unit: [bytes]
+ *
+ * Interpretation: less is better
+ *
+ * Examples:
+ *
+ * UDP (No connection) :
+ * 0 bytes
+ * TCP (TCP 3-Way handshake):
+ * 220 bytes Ethernet, 172 bytes TCP/IP, 122 bytes TCP
+ * HTTP (TCP + Header) :
+ * 477 bytes Ethernet, 429 bytes TCP/IP, 374 bytes TCP, 278 bytes HTTP
+ * HTTPS HTTP+TLS Handshake:
+ * 2129 bytes Ethernet, 1975 bytes TCP/IP, 1755 bytes TCP, 1403 bytes HTTPS
+ *
+ * */
+ // GNUNET_ATS_COST_CONNECT = 5,
+ /**
+ * Bandwidth cost
+ *
+ * How many bandwidth is available to consume?
+ * Used to calculate which impact sending data with this transport has
+ *
+ * Unit: [kB/s]
+ *
+ * Interpretation: more is better
+ *
+ * Examples:
+ * LAN: 12,800 (100 MBit/s)
+ * WLAN: 6,912 (54 MBit/s)
+ * Dial-up: 8 (64 Kbit/s)
+ *
+ */
+ // GNUNET_ATS_COST_BANDWITH_AVAILABLE = 6,
+ /**
+ * Network overhead
+ *
+ * How many bytes are sent over the wire when 1 kilobyte (1024 bytes)
+ * of application data is transmitted?
+ * A factor used with connect cost, bandwidth cost and energy cost
+ * to describe the overhead produced by the transport protocol
+ *
+ * Unit: [bytes/kb]
+ *
+ * Interpretation: less is better
+ *
+ * Examples:
+ *
+ * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
+ * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
+ * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
+ * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
+ */
+ // GNUNET_ATS_COST_NETWORK_OVERHEAD = 7,
+ /* Quality related values */
+ /* ====================== */
+ /* Physical layer quality properties */
+ /**
+ * Signal strength on physical layer
+ *
+ * Unit: [dBm]
+ */
+ // GNUNET_ATS_QUALITY_PHY_SIGNAL_STRENGTH = 1025,
+ /**
+ * Collision rate on physical layer
+ *
+ * Unit: [B/s]
+ */
+ // GNUNET_ATS_QUALITY_PHY_COLLISION_RATE = 1026,
+ /**
+ * Error rate on physical layer
+ *
+ * Unit: [B/s]
+ */
+ // GNUNET_ATS_QUALITY_PHY_ERROR_RATE = 1027,
+ /**
+ * Jitter
+ * Time variations of the delay
+ * 1st derivative of a delay function
+ *
+ * Unit: [ms]
+ */
+ // GNUNET_ATS_QUALITY_NET_JITTER = 1029,
+ /**
+ * Error rate on network layer
+ *
+ * Unit: [B/s]
+ *
+ * Examples:
+ *
+ * LAN : 0
+ * WLAN : 400
+ * Bluetooth : 100
+ * Note: This numbers are just assumptions as an example, not
+ * measured or somehow determined
+ */
+ // GNUNET_ATS_QUALITY_NET_ERRORRATE = 1030,
+ /**
+ * Drop rate on network layer
+ * Bytes actively dismissed by a network component during transmission
+ * Reasons for dropped data can be full queues, congestion, quota violations...
+ *
+ * Unit: [B/s]
+ *
+ * Examples:
+ *
+ * LAN : 0
+ * WLAN : 400
+ * Bluetooth : 100
+ * Note: This numbers are just assumptions as an example, not
+ * measured or somehow determined
+ */
+ // GNUNET_ATS_QUALITY_NET_DROPRATE = 1031,
+ /**
+ * Loss rate on network layer
+ * Bytes lost during transmission
+ * Reasons can be collisions, ...
+ *
+ * Unit: [B/s]
+ *
+ * Examples:
+ *
+ * LAN : 0
+ * WLAN : 40
+ * Bluetooth : 10
+ * Note: This numbers are just assumptions as an example, not measured
+ * or somehow determined
+ */
+ // GNUNET_ATS_QUALITY_NET_LOSSRATE = 1032,
+ /**
+ * Throughput on network layer
+ *
+ * Unit: [kB/s]
+ *
+ * Examples:
+ *
+ * LAN : 3400
+ * WLAN : 1200
+ * Dialup: 4
+ *
+ */
+ // GNUNET_ATS_QUALITY_NET_THROUGHPUT = 1033,
+ /* Availability related values */
+ /* =========================== */
+ /**
+ * Is a peer reachable?
+ */
+ // GNUNET_ATS_AVAILABILITY_REACHABLE = 2048,
+ /**
+ * Is there a connection established to a peer using this transport
+ */
+ // GNUNET_ATS_AVAILABILITY_CONNECTED = 2049
+};
/**
- * 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.
- *
- * @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);
+ * Number of ATS quality properties
+ */
+#define GNUNET_ATS_QualityPropertiesCount 2
+
+/**
+ * ATS quality properties as array initializer
+ */
+#define GNUNET_ATS_QualityProperties {GNUNET_ATS_QUALITY_NET_DELAY, GNUNET_ATS_QUALITY_NET_DISTANCE}
+/**
+ * Number of ATS quality properties
+ */
+#define GNUNET_ATS_NetworkTypeCount 5
/**
- * Initialize the ATS subsystem.
- *
- * @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
+ * ATS quality properties as array initializer
*/
-struct GNUNET_ATS_Handle *
-GNUNET_ATS_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
- GNUNET_TRANSPORT_ATS_AllocationNotification alloc_cb,
- void *alloc_cb_cls);
+#define GNUNET_ATS_NetworkType {GNUNET_ATS_NET_UNSPECIFIED, GNUNET_ATS_NET_LOOPBACK, GNUNET_ATS_NET_LAN, GNUNET_ATS_NET_WAN, GNUNET_ATS_NET_WLAN}
+GNUNET_NETWORK_STRUCT_BEGIN
/**
- * Shutdown the ATS subsystem.
+ * struct used to communicate the transport's properties like cost and
+ * quality of service as well as high-level constraints on resource
+ * consumption.
*
- * @param atc handle
+ * +---+
+ * +-----------+ Constraints | | Plugin properties +---------+
+ * | Highlevel |------------> |ATS| <------------------|Transport|
+ * | Component | ATS struct | | ATS struct | Plugin |
+ * +-----------+ | | +---------+
+ * +---+
+ *
+ * This structure will be used by transport plugins to communicate
+ * costs to ATS or by higher level components to tell ATS their
+ * constraints. Always a pair of (GNUNET_ATS_Property,
+ * uint32_t value). Value is always uint32_t, so all units used to
+ * define costs have to be normalized to fit uint32_t.
*/
-void
-GNUNET_ATS_shutdown (struct GNUNET_ATS_Handle *atc);
+struct GNUNET_ATS_Information
+{
+ /**
+ * ATS property type, in network byte order.
+ */
+ uint32_t type GNUNET_PACKED;
+
+ /**
+ * ATS property value, in network byte order.
+ */
+ uint32_t value GNUNET_PACKED;
+};
+GNUNET_NETWORK_STRUCT_END
+
+
+/* ******************************** Scheduling API ***************************** */
+
+/**
+ * Handle to the ATS subsystem for bandwidth/transport scheduling information.
+ */
+struct GNUNET_ATS_SchedulingHandle;
/**
- * Signature of a function that takes an address suggestion
+ * Opaque session handle, defined by plugins. Contents not known to ATS.
+ */
+struct Session;
+
+
+/**
+ * Signature of a function called by ATS with the current bandwidth
+ * and address preferences as determined by ATS.
*
* @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 address suggested address (including peer identity of the peer)
+ * @param session session to use
+ * @param bandwidth_out assigned outbound bandwidth for the connection
+ * @param bandwidth_in assigned inbound bandwidth for the connection
* @param ats performance data for the address (as far as known)
* @param ats_count number of performance records in 'ats'
*/
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,
+ GNUNET_HELLO_Address *
+ address,
struct Session * session,
struct
GNUNET_BANDWIDTH_Value32NBO
- bandwidth,
+ bandwidth_out,
+ struct
+ GNUNET_BANDWIDTH_Value32NBO
+ bandwidth_in,
const struct
- GNUNET_TRANSPORT_ATS_Information
- * ats,
- uint32_t ats_count);
+ GNUNET_ATS_Information *
+ ats, uint32_t ats_count);
/**
- * Handle to cancel suggestion request.
+ * Initialize the ATS subsystem.
+ *
+ * @param cfg configuration to use
+ * @param suggest_cb notification to call whenever the suggestation changed
+ * @param suggest_cb_cls closure for 'suggest_cb'
+ * @return ats context
*/
-struct GNUNET_ATS_SuggestionContext;
+struct GNUNET_ATS_SchedulingHandle *
+GNUNET_ATS_scheduling_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ GNUNET_ATS_AddressSuggestionCallback suggest_cb,
+ void *suggest_cb_cls);
/**
- * We would like to establish a new connection with a peer.
- * ATS should suggest a good address to begin with.
+ * Client is done with ATS scheduling, release resources.
*
- * @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 sh handle to release
*/
-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_scheduling_done (struct GNUNET_ATS_SchedulingHandle *sh);
/**
- * Cancel suggestion request.
+ * We would like to reset the address suggestion block time for this
+ * peer
*
- * @param asc handle of the request to cancel
+ * @param sh handle
+ * @param peer identity of the peer we want to reset
*/
void
-GNUNET_ATS_suggest_address_cancel (struct GNUNET_ATS_SuggestionContext *asc);
-
+GNUNET_ATS_reset_backoff (struct GNUNET_ATS_SchedulingHandle *sh,
+ const struct GNUNET_PeerIdentity *peer);
/**
- * 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 sh handle
+ * @param peer identity of the peer we need an address for
*/
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_suggest_address (struct GNUNET_ATS_SchedulingHandle *sh,
+ const struct GNUNET_PeerIdentity *peer);
/**
- * 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.
+ * We want to cancel ATS suggesting addresses for a peer.
*
- * @param atc handle
+ * @param sh handle
* @param peer identity of the peer
*/
void
-GNUNET_ATS_peer_disconnect (struct GNUNET_ATS_Handle *atc,
- const struct GNUNET_PeerIdentity *peer);
+GNUNET_ATS_suggest_address_cancel (struct GNUNET_ATS_SchedulingHandle *sh,
+ const struct GNUNET_PeerIdentity *peer);
/**
- * A session got destroyed, stop including it as a valid address.
+ * Returns where the address is located: LAN or WAN or ...
+ * @param sh the GNUNET_ATS_SchedulingHandle handle
+ * @param addr address
+ * @param addrlen address length
+ * @return location as GNUNET_ATS_Information
+ */
+struct GNUNET_ATS_Information
+GNUNET_ATS_address_get_type (struct GNUNET_ATS_SchedulingHandle *sh,
+ const struct sockaddr * addr,
+ socklen_t addrlen);
+
+/**
+ * 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 atc handle
- * @param peer identity of the peer
- * @param session session handle that is no longer valid
+ * @param sh handle
+ * @param address the address
+ * @param session session handle (if available)
+ * @param ats performance data for the address
+ * @param ats_count number of performance records in 'ats'
*/
-void
-GNUNET_ATS_session_destroyed (struct GNUNET_ATS_Handle *atc,
- const struct GNUNET_PeerIdentity *peer,
- const struct Session *session);
+int
+GNUNET_ATS_address_add (struct GNUNET_ATS_SchedulingHandle *sh,
+ const struct GNUNET_HELLO_Address *address,
+ struct Session *session,
+ const struct GNUNET_ATS_Information *ats,
+ uint32_t ats_count);
/**
* 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 sh handle
+ * @param address updated address
* @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'
*/
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,
+GNUNET_ATS_address_update (struct GNUNET_ATS_SchedulingHandle *sh,
+ const struct GNUNET_HELLO_Address *address,
+ struct Session *session,
+ const struct GNUNET_ATS_Information *ats,
uint32_t ats_count);
+/**
+ * An address is now in use or not used any more.
+ *
+ * @param sh handle
+ * @param address the address
+ * @param session session handle
+ * @param in_use GNUNET_YES if this address is now used, GNUNET_NO
+ * if address is not used any more
+ */
+void
+GNUNET_ATS_address_in_use (struct GNUNET_ATS_SchedulingHandle *sh,
+ const struct GNUNET_HELLO_Address *address,
+ struct Session *session, int in_use);
+
+
+/**
+ * A session got destroyed, stop including it as a valid address.
+ *
+ * @param sh handle
+ * @param address the address
+ * @param session session handle that is no longer valid (if available)
+ */
+void
+GNUNET_ATS_address_destroyed (struct GNUNET_ATS_SchedulingHandle *sh,
+ const struct GNUNET_HELLO_Address *address,
+ struct Session *session);
+
+
+/* ******************************** 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 a peer.
+ *
+ * @param cls closure
+ * @param address the address
+ * @param bandwidth_out assigned outbound bandwidth for the connection
+ * @param bandwidth_in assigned inbound bandwidth for the connection
+ * @param ats performance data for the address (as far as known)
+ * @param ats_count number of performance records in 'ats'
+ */
+typedef void (*GNUNET_ATS_PeerInformationCallback) (void *cls,
+ const struct
+ GNUNET_HELLO_Address *
+ address,
+ struct
+ GNUNET_BANDWIDTH_Value32NBO
+ bandwidth_out,
+ struct
+ GNUNET_BANDWIDTH_Value32NBO
+ bandwidth_in,
+ const struct
+ GNUNET_ATS_Information *
+ ats, uint32_t ats_count);
+
+
+/**
+ * Get handle to access performance API of the ATS subsystem.
+ *
+ * @param cfg configuration to use
+ * @param infocb function to call on performance changes, can be NULL
+ * @param infocb_cls closure for infocb
+ * @return ats performance context
+ */
+struct GNUNET_ATS_PerformanceHandle *
+GNUNET_ATS_performance_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ GNUNET_ATS_PeerInformationCallback infocb,
+ void *infocb_cls);
+
+
+/**
+ * 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 info
+ * @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);
+
+
+
+/**
+ * Enum defining all known preference categories.
+ */
+enum GNUNET_ATS_PreferenceKind
+{
+
+ /**
+ * End of preference list.
+ */
+ GNUNET_ATS_PREFERENCE_END = 0,
+
+ /**
+ * 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,
+
+ /**
+ * 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 ms (minimum: 1 ms) multiplied by
+ * the latency preferences.
+ */
+ GNUNET_ATS_PREFERENCE_LATENCY
+};
+
+
+/**
+ * Change preferences for the given peer. Preference changes are forgotten if peers
+ * disconnect.
+ *
+ * @param ph performance handle
+ * @param peer identifies the peer
+ * @param ... 0-terminated specification of the desired changes
+ */
+void
+GNUNET_ATS_change_preference (struct GNUNET_ATS_PerformanceHandle *ph,
+ const struct GNUNET_PeerIdentity *peer, ...);
+
+
+
#endif
/* end of file gnunet-service-transport_ats.h */
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