/*
- This file is part of GNUnet.
- (C) 2011 Christian Grothoff (and other contributing authors)
+ This file is part of GNUnet.
+ Copyright (C) 2011-2014 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 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.
+ 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.
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- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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-*/
+ 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,
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+ */
/**
- * @file ats/gnunet-service-ats_addresses.c
+ * @file ats/gnunet-service-ats_addresses.h
* @brief ats service address management
* @author Matthias Wachs
* @author Christian Grothoff
#include "gnunet_util_lib.h"
#include "gnunet_ats_service.h"
-#include "ats.h"
+#include "gnunet-service-ats.h"
+
+/**
+ * NOTE: Do not change this documentation. This documentation is based on
+ * gnunet.org:/vcs/fsnsg/ats-paper.git/tech-doku/ats-tech-guide.tex
+ * use build_txt.sh to generate plaintext output
+ *
+ * 1 ATS addresses : ATS address management
+ *
+ * This ATS addresses ("addresses") component manages the addresses known to
+ * ATS service and suggests addresses to transport service when it is
+ * interested in address suggestion for a peer. ATS addresses also
+ * instantiates the bandwidth assignment mechanism (solver), notifies it
+ * about changes to addresses and forwards changes to bandwidth assignments
+ * to transport, depending if transport is interested in this change.
+ *
+ * 1.1 Input data
+ *
+ * 1.1.1 Addresses
+ *
+ * Addresses are added by specifying peer ID, plugin, address, address length
+ * and session, if available. ATS information can be specified if available.
+ *
+ * 1.1.2 Networks
+ *
+ * ATS specifies a fix set of networks an address can belong to. For each
+ * network an inbound and outbound quota will be specified. The available
+ * networks and addtional helper varaibles are defined in
+ * gnunet_ats_service.h. At the moment 5 networks are defined:
+ * * GNUNET_ATS_NET_UNSPECIFIED
+ * * GNUNET_ATS_NET_LOOPBACK
+ * * GNUNET_ATS_NET_LAN
+ * * GNUNET_ATS_NET_WAN
+ * * GNUNET_ATS_NET_WLAN
+ *
+ * The total number of networks defined is stored in
+ * GNUNET_ATS_NetworkTypeCount GNUNET_ATS_NetworkType can be used array
+ * initializer for an int array, while GNUNET_ATS_NetworkType is an
+ * initializer for a char array containing a string description of all
+ * networks
+ *
+ * 1.1.3 Quotas
+ *
+ * An inbound and outbound quota for each of the networks mentioned in 1.1.2
+ * is loaded from ats configuration during initialization. This quota defines
+ * to total amount of inbound and outbound traffic allowed for a specific
+ * network. The configuration values used are in section ats:
+ * * "NETWORK"_QUOTA_IN = <value>
+ * * "NETWORK"_QUOTA_IN = <value>
+ *
+ * You can specify quotas by setting the <value> to a:
+ * * unrestricted: unlimited
+ * * number of bytes: e.g. 10240
+ * * fancy value: e.g. 64 Kib
+ *
+ * unlimited is defined as GNUNET_ATS_MaxBandwidthString and equivalent to
+ * the value GNUNET_ATS_MaxBandwidth Important predefined values for quotas
+ * are:
+ * * GNUNET_ATS_DefaultBandwidth: 65536
+ * * GNUNET_ATS_MaxBandwidth: UINT32_MAX
+ * * GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT: 1024
+ *
+ * Details of loading quotas and default values will be described on
+ *
+ * 1.1.4 Preference values
+ *
+ * 1.2 Data structures used
+ *
+ * Addresse uses struct ATS_Address for each address. The structs are stored
+ * in a linked list and provides a pointer void *solver_information for the
+ * solver to store address specific information. It provides the int values
+ * active which is set to GNUNET_YES if the address is select for transport
+ * use and used, representing that transport service is actively using this
+ * address. Address information are stored in peer, addr, addr_len, plugin.
+ *
+ * 1.3 Initialization
+ *
+ * During initialization a hashmap to store addresses is created. The quotas
+ * for all networks defined for ATS are loaded from configuration. For each
+ * network first the logic will check if the string
+ * GNUNET_ATS_MaxBandwidthString is configured, if not it will try to convert
+ * the configured value as a fancy size and if this fails it will try to use
+ * it as a value_number. If no configuration value is found it will assign
+ * GNUNET_ATS_DefaultBandwidth. The most important step is to load the
+ * configured solver using configuration "[ats]:MODE". Current solvers are
+ * MODE_PROPORTIONAL, MODE_MLP. Interaction is done using a solver API
+ *
+ * 1.4 Solver API
+ *
+ * Solver functions:
+ * * s_init: init the solver with required information
+ * * s_add: add a new address
+ * * s_update: update ATS values or session for an address
+ * * s_get: get prefered address for a peer
+ * * s_del: delete an address
+ * * s_pref: change preference value for a peer
+ * * s_done: shutdown solver
+ *
+ * Callbacks: addresses provides a bandwidth_changed_cb callback to the
+ * solver which is called when bandwidth assigned to peer has changed
+ *
+ * 1.5 Shutdown
+ *
+ * During shutdown all addresses are freed and the solver told to shutdown
+ *
+ * 1.6 Addresses and sessions
+ *
+ * Addresses consist of the address itself and a numerical session. When a
+ * new address without a session is added it has no session, so it gets
+ * session 0 assigned. When an address with a session is added and an address
+ * object with session 0 is found, this object is updated with the session
+ * otherwise a new address object with this session assigned is created.
+ *
+ * 1.6.1 Terminology
+ *
+ * Addresses a1,a2 with session s1, s2 are "exact" if:
+ * (a1 == a2)&&(s1 == s2)
+ * Addresses a1,a2 with session s1, s2 are "equivalent" if:
+ * (a1 == a2)&&((s1 == s2)||(s1 == 0)||(s2 == 0)
+ *
+ * 1.7 Address management
+ *
+ * Transport service notifies ATS about changes to the addresses known to
+ * him.
+ *
+ * 1.7.1 Adding an address
+ *
+ * When transport learns a new address it tells ATS and ATS is telling
+ * addresses about it using GAS_address_add. If not known to addresses it
+ * creates a new address object and calls solver's s_add. ATS information are
+ * deserialized and solver is notified about the session and ATS information
+ * using s_update.
+ *
+ * 1.7.2 Updating an address
+ *
+ * Addresses does an lookup up for the existing address with the given
+ * session. If disassembles included ATS information and notifies the solver
+ * using s_update about the update.
+ *
+ * 1.7.3 Deleting an address
+ *
+ * Addresses does an lookup for the exact address and session and if removes
+ * this address. If session != 0 the session is set to 0 and the address is
+ * kept. If session == 0, the addresses is removed.
+ *
+ * 1.7.4 Requesting an address suggestion
+ *
+ * The address client issues a request address message to be notified about
+ * address suggestions for a specific peer. Addresses asks the solver with
+ * s_get. If no address is available, it will not send a response, otherwise
+ * it will respond with the choosen address.
+ *
+ * 1.7.5 Address suggestions
+ *
+ * Addresses will notify the client automatically on any bandwidth_changed_cb
+ * by the solver if a address suggestion request is pending. If no address is
+ * available it will not respond at all If the client is not interested
+ * anymore, it has to cancel the address suggestion request.
+ *
+ * 1.7.6 Suggestions blocks and reset
+ *
+ * After suggesting an address it is blocked for ATS_BLOCKING_DELTA sec. to
+ * prevent the client from being thrashed. If the client requires immediately
+ * it can reset this block using GAS_addresses_handle_backoff_reset.
+ *
+ * 1.7.7 Address lifecycle
+ *
+ * * (add address)
+ * * (updated address)
+ * * (delete address)
+ *
+ * 1.8 Bandwidth assignment
+ *
+ * The addresses are used to perform resource allocation operations. ATS
+ * addresses takes care of instantiating the solver configured and notifies
+ * the respective solver about address changes and receives changes to the
+ * bandwidth assignment from the solver. The current bandwidth assignment is
+ * sent to transport. The specific solvers will be described in the specific
+ * section.
+ *
+ * 1.9 Changing peer preferences
+ *
+ * The bandwidth assigned to a peer can be influenced by setting a preference
+ * for a peer. The prefernce will be given to to the solver with s_pref which
+ * has to take care of the preference value
+ */
+
+
+/*
+ * How long will address suggestions blocked after a suggestion
+ */
+#define ATS_BLOCKING_DELTA GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 100)
/**
- * Initialize address subsystem.
- * @param cfg configuration to use
+ * Information provided by ATS normalization
+ */
+struct GAS_NormalizationInfo
+{
+ /**
+ * Next index to use in averaging queue
+ */
+ unsigned int avg_queue_index;
+
+ /**
+ * Averaging queue
+ */
+ uint64_t atsi_abs[GAS_normalization_queue_length];
+
+ /**
+ * Averaged ATSI values from queue
+ */
+ uint64_t avg;
+
+ /**
+ * Normalized values from queue to a range of values [1.0...2.0]
+ */
+ double norm;
+};
+
+
+/**
+ * Address with additional information
+ */
+struct ATS_Address
+{
+ /**
+ * Peer ID this address is for.
+ */
+ struct GNUNET_PeerIdentity peer;
+
+ /**
+ * Address (in plugin-specific binary format).
+ */
+ const void *addr;
+
+ /**
+ * Plugin name
+ */
+ char *plugin;
+
+ /**
+ * Solver-specific information for this address
+ */
+ void *solver_information;
+
+ /**
+ * ATS performance information for this address
+ */
+ struct GNUNET_ATS_Properties properties;
+
+ /**
+ * Time when address had last activity (update, in uses)
+ */
+ struct GNUNET_TIME_Absolute t_last_activity;
+
+ /**
+ * Time when address was added
+ */
+ struct GNUNET_TIME_Absolute t_added;
+
+ /**
+ * Address length, number of bytes in @e addr.
+ */
+ size_t addr_len;
+
+ /**
+ * Session ID, can never be 0.
+ */
+ uint32_t session_id;
+
+ /**
+ * Field to store local flags.
+ */
+ enum GNUNET_HELLO_AddressInfo local_address_info;
+
+ /**
+ * ATS performance information for this address, size of the @e atsi array.
+ */
+ uint32_t atsi_count;
+
+ /**
+ * Inbound bandwidth assigned by solver
+ */
+ uint32_t assigned_bw_in;
+
+ /**
+ * Outbound bandwidth assigned by solver
+ */
+ uint32_t assigned_bw_out;
+
+ /**
+ * Inbound bandwidth assigned by solver in NBO
+ */
+ uint32_t last_notified_bw_in;
+
+ /**
+ * Outbound bandwidth assigned by solver in NBO
+ */
+ uint32_t last_notified_bw_out;
+
+ /**
+ * Is this the active address for this peer?
+ */
+ int active;
+
+ /**
+ * Normalized delay information for this address.
+ */
+ struct GAS_NormalizationInfo norm_delay;
+
+ /**
+ * Normalized distance information for this address.
+ */
+ struct GAS_NormalizationInfo norm_distance;
+
+ /**
+ * Normalized utilization inbound for this address.
+ */
+ struct GAS_NormalizationInfo norm_utilization_in;
+
+ /**
+ * Normalized utilization outbound for this address.
+ */
+ struct GAS_NormalizationInfo norm_utilization_out;
+
+};
+
+
+/**
+ * A multipeermap mapping peer identities to `struct ATS_Address`.
+ */
+extern struct GNUNET_CONTAINER_MultiPeerMap *GSA_addresses;
+
+
+/**
+ * Initialize address subsystem. The addresses subsystem manages the addresses
+ * known and current performance information.
+ *
+ * @param server handle to our server
*/
void
-GAS_addresses_init (const struct GNUNET_CONFIGURATION_Handle *cfg);
+GAS_addresses_init (struct GNUNET_SERVER_Handle *server);
/**
void
GAS_addresses_done (void);
+
/**
- * Returns where the address is located: LAN or WAN or ...
- * @param addr address
- * @param addrlen address length
- * @return location as GNUNET_ATS_Information
+ * Add a new address for a peer.
+ *
+ * @param peer peer
+ * @param plugin_name transport plugin name
+ * @param plugin_addr plugin address
+ * @param plugin_addr_len length of the @a plugin_addr
+ * @param local_address_info the local address for the address
+ * @param session_id session id, can never be 0.
+ * @param prop performance information for this address
*/
+void
+GAS_addresses_add (const struct GNUNET_PeerIdentity *peer,
+ const char *plugin_name,
+ const void *plugin_addr,
+ size_t plugin_addr_len,
+ uint32_t local_address_info,
+ uint32_t session_id,
+ const struct GNUNET_ATS_Properties *prop);
-struct GNUNET_ATS_Information
-GAS_addresses_type (struct sockaddr * addr, socklen_t addrlen);
/**
- * This address is now used or not used anymore
+ * Update an address with new performance information for a peer.
+ *
+ * @param peer peer
+ * @param session_id session id, can never be 0
+ * @param prop performance information for this address
*/
void
-GAS_addresses_in_use (const struct GNUNET_PeerIdentity *peer,
- const char *plugin_name, const void *plugin_addr,
- size_t plugin_addr_len, uint32_t session_id, int in_use);
-
-void
GAS_addresses_update (const struct GNUNET_PeerIdentity *peer,
- const char *plugin_name, const void *plugin_addr,
- size_t plugin_addr_len, uint32_t session_id,
- const struct GNUNET_ATS_Information *atsi,
- uint32_t atsi_count);
+ uint32_t session_id,
+ const struct GNUNET_ATS_Properties *prop);
+/**
+ * Remove an address for a peer.
+ *
+ * @param peer peer
+ * @param session_id session id, can never be 0
+ */
void
GAS_addresses_destroy (const struct GNUNET_PeerIdentity *peer,
- const char *plugin_name, const void *plugin_addr,
- size_t plugin_addr_len, uint32_t session_id);
+ uint32_t session_id);
+/**
+ * Remove all addresses.
+ */
void
GAS_addresses_destroy_all (void);
-// FIXME: this function should likely end up in the LP-subsystem and
-// not with 'addresses' in the future...
-// Note: this call should trigger an address suggestion
-// (GAS_scheduling_transmit_address_suggestion)
-void
-GAS_addresses_request_address (const struct GNUNET_PeerIdentity *peer);
+/**
+ * Iterator for #GAS_addresses_get_peer_info()
+ *
+ * @param cls closure
+ * @param id the peer id
+ * @param plugin_name plugin name
+ * @param plugin_addr address
+ * @param plugin_addr_len length of @a plugin_addr
+ * @param address_active is address actively used
+ * @param atsi ats performance information
+ * @param local_address_info flags for the address
+ * @param bandwidth_out current outbound bandwidth assigned to address
+ * @param bandwidth_in current inbound bandwidth assigned to address
+ */
+typedef void
+(*GNUNET_ATS_PeerInfo_Iterator) (void *cls,
+ const struct GNUNET_PeerIdentity *id,
+ const char *plugin_name,
+ const void *plugin_addr,
+ size_t plugin_addr_len,
+ const int address_active,
+ const struct GNUNET_ATS_Properties *prop,
+ enum GNUNET_HELLO_AddressInfo local_address_info,
+ struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
+ struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in);
-// FIXME: this function should likely end up in the LP-subsystem and
-// not with 'addresses' in the future...
+/**
+ * Return information all peers currently known to ATS
+ *
+ * @param peer the respective peer
+ * @param pi_it the iterator to call for every peer
+ * @param pi_it_cls the closure for @a pi_it
+ */
void
-GAS_addresses_change_preference (const struct GNUNET_PeerIdentity *peer,
- enum GNUNET_ATS_PreferenceKind kind,
- float score);
+GAS_addresses_get_peer_info (const struct GNUNET_PeerIdentity *peer,
+ GNUNET_ATS_PeerInfo_Iterator pi_it,
+ void *pi_it_cls);
-/* FIXME: add performance request API */
+/**
+ * Handle 'address list request' messages from clients.
+ *
+ * @param cls unused, NULL
+ * @param client client that sent the request
+ * @param message the request message
+ */
+void
+GAS_handle_request_address_list (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message);
+
#endif
+
+/* end of gnunet-service-ats_addresses.h */