X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Fats%2Fgnunet-service-ats_addresses.h;h=7ed609eaf392e83ea1fdaf220f72aa70451ef143;hb=acac80b2c2b5cf432e903350a0dc6bbaa5ee877c;hp=b5c6659920725c47fc1fe8119ba70a9fbb7ffa3f;hpb=ae95d2cfa0d571bde89af7b6712c4f348e193232;p=oweals%2Fgnunet.git diff --git a/src/ats/gnunet-service-ats_addresses.h b/src/ats/gnunet-service-ats_addresses.h index b5c665992..7ed609eaf 100644 --- a/src/ats/gnunet-service-ats_addresses.h +++ b/src/ats/gnunet-service-ats_addresses.h @@ -1,22 +1,22 @@ /* - This file is part of GNUnet. - (C) 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. -*/ + This file is part of GNUnet. + (C) 2011-2014 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 ats/gnunet-service-ats_addresses.h @@ -29,12 +29,263 @@ #include "gnunet_util_lib.h" #include "gnunet_ats_service.h" +#include "gnunet-service-ats.h" #include "gnunet_statistics_service.h" #include "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 = + * * "NETWORK"_QUOTA_IN = + * + * You can specify quotas by setting the 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 Marking address in use + * + * The client can notify addresses that it successfully uses an address and + * wants this address to be kept by calling GSA_address_in_use. Adresses will + * mark the address as used an notify the solver about the use. + * + * 1.7.8 Address lifecycle + * + * * (add address) + * * (updated address) || (address in use) + * * (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 + + */ + +/** + * Available ressource assignment modes + */ +enum ATS_Mode +{ + /* + * proportional mode: + * + * Assign each peer an equal amount of bandwidth (bw) + * + * bw_per_peer = bw_total / #active addresses + */ + MODE_PROPORTIONAL, + + /* + * MLP mode: + * + * Solve ressource assignment as an optimization problem + * Uses an mixed integer programming solver + */ + MODE_MLP, + + /* + * Reinforcement Learning mode: + * + * Solve resource assignment using a learning agent + */ + MODE_RIL +}; + + +/* + * How long will address suggestions blocked after a suggestion + */ #define ATS_BLOCKING_DELTA GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 100) -struct GAS_Addresses_Handle; +/** + * Information provided by ATS normalization + */ +struct GAS_NormalizationInfo +{ + /** + * Next index to use in averaging queue + */ + unsigned int avg_queue_index; + + /** + * Averaging queue + */ + uint32_t atsi_abs[GAS_normalization_queue_length]; + + /** + * Averaged ATSI values from queue + */ + uint32_t avg; + + /** + * Normalized values from queue to a range of values [1.0...2.0] + */ + double norm; +}; /** * Address with additional information @@ -61,6 +312,11 @@ struct ATS_Address */ uint32_t session_id; + /** + * FIXME + */ + uint32_t local_address_info; + /** * Address */ @@ -81,30 +337,15 @@ struct ATS_Address */ void *solver_information; - /* CHECK USAGE */ - struct GNUNET_TIME_Relative atsp_latency; - - /* CHECK USAGE */ - struct GNUNET_BANDWIDTH_Value32NBO atsp_utilization_in; - - /* CHECK USAGE */ - struct GNUNET_BANDWIDTH_Value32NBO atsp_utilization_out; - - - /* CHECK USAGE */ - uint32_t atsp_distance; - - /* CHECK USAGE */ - uint32_t atsp_cost_wan; - - /* CHECK USAGE */ - uint32_t atsp_cost_lan; - - /* CHECK USAGE */ - uint32_t atsp_cost_wlan; + /** + * ATS performance information for this address + */ + struct GNUNET_ATS_Information *atsi; - /* CHECK USAGE */ - uint32_t atsp_network_type; + /** + * ATS performance information for this address + */ + uint32_t atsi_count; /** * Inbound bandwidth assigned by solver in NBO @@ -126,6 +367,16 @@ struct ATS_Address */ struct GNUNET_TIME_Absolute blocked_until; + /** + * 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; + /** * Is this the active address for this peer? */ @@ -135,201 +386,307 @@ struct ATS_Address * Is this the address for this peer in use? */ int used; -}; - -/** - * Callback to call from solver when bandwidth for address has changed - * - * @param address the with changed bandwidth assigned - */ + /** + * Normalized ATS performance information for this address + * Each entry can be accessed using the GNUNET_ATS_QualityProperties avg_queue_index + */ + struct GAS_NormalizationInfo atsin[GNUNET_ATS_QualityPropertiesCount]; +}; -typedef void - (*GAS_bandwidth_changed_cb) (void *cls, struct ATS_Address *address); /** - * Init the simplistic problem solving component - * - * Quotas: - * network[i] contains the network type as type GNUNET_ATS_NetworkType[i] - * out_quota[i] contains outbound quota for network type i - * in_quota[i] contains inbound quota for network type i - * - * Example - * network = {GNUNET_ATS_NET_UNSPECIFIED, GNUNET_ATS_NET_LOOPBACK, GNUNET_ATS_NET_LAN, GNUNET_ATS_NET_WAN, GNUNET_ATS_NET_WLAN} - * network[2] == GNUNET_ATS_NET_LAN - * out_quota[2] == 65353 - * in_quota[2] == 65353 - * - * @param cfg configuration handle - * @param stats the GNUNET_STATISTICS handle - * @param network array of GNUNET_ATS_NetworkType with length dest_length - * @param out_quota array of outbound quotas - * @param in_quota array of outbound quota - * @param bw_changed_cb callback to call when assigned changes - * @return handle for the solver on success, NULL on fail + * Handle for ATS address component */ -typedef void * - (*GAS_solver_init) (const struct GNUNET_CONFIGURATION_Handle *cfg, - const struct GNUNET_STATISTICS_Handle *stats, - int *network, - unsigned long long *out_quota, - unsigned long long *in_quota, - int dest_length, - GAS_bandwidth_changed_cb bw_changed_cb, - void *bw_changed_cb_cls); - - -typedef void -(*GAS_solver_address_change_preference) (void *solver, - const struct GNUNET_PeerIdentity *peer, - enum GNUNET_ATS_PreferenceKind kind, - float score); - -/** - * Add a single address to the solver - * - * @param solver the solver Handle - * @param addresses the address hashmap containing all addresses - * @param address the address to add - */ -typedef void -(*GAS_solver_address_add) (void *solver, - struct GNUNET_CONTAINER_MultiHashMap * addresses, - struct ATS_Address *address); - - - -typedef void - (*GAS_solver_address_delete) (void *solver, - struct GNUNET_CONTAINER_MultiHashMap *addresses, - struct ATS_Address *address, - int session_only); - -typedef void -(*GAS_solver_address_update) (void *solver, - struct GNUNET_CONTAINER_MultiHashMap *addresses, - struct ATS_Address *address); - - -typedef const struct ATS_Address * -(*GAS_solver_get_preferred_address) (void *solver, - struct GNUNET_CONTAINER_MultiHashMap *addresses, - const struct GNUNET_PeerIdentity *peer); - - -typedef void - (*GAS_solver_done) (void *solver); - +struct GAS_Addresses_Handle; /** - * Initialize address subsystem. + * Initialize address subsystem. The addresses subsystem manages the addresses + * known and current performance information. It has a solver component + * responsible for the resource allocation. It tells the solver about changes + * and receives updates when the solver changes the ressource allocation. * * @param cfg configuration to use * @param stats the statistics handle to use + * @return an address handle */ struct GAS_Addresses_Handle * GAS_addresses_init (const struct GNUNET_CONFIGURATION_Handle *cfg, const struct GNUNET_STATISTICS_Handle *stats); + /** * Shutdown address subsystem. + * + * @param handle the address handle to shutdown */ void GAS_addresses_done (struct GAS_Addresses_Handle *handle); + +/** + * Add a new address for a peer. + * + * @param handle the address handle to use + * @param peer peer + * @param plugin_name transport plugin name + * @param plugin_addr plugin address + * @param plugin_addr_len length of the plugin address + * @param local_address_info the local address for the address + * @param session_id session id, can be 0 + * @param atsi performance information for this address + * @param atsi_count number of performance information contained in @a atsi + */ void -GAS_addresses_handle_backoff_reset (struct GAS_Addresses_Handle *handle, - const struct GNUNET_PeerIdentity *peer); +GAS_addresses_add (struct GAS_Addresses_Handle *handle, + 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_Information *atsi, + uint32_t atsi_count); + /** - * This address is now used or not used anymore + * Notification about active use of an address. + * in_use == #GNUNET_YES: + * This address is used to maintain an active connection with a peer. + * in_use == #GNUNET_NO: + * This address is no longer used to maintain an active connection with a peer. + * + * Note: can only be called with in_use == #GNUNET_NO if called with #GNUNET_YES + * before + * + * @param handle the address handle to use + * @param peer peer + * @param plugin_name transport plugin name + * @param plugin_addr plugin address + * @param plugin_addr_len length of the plugin address in @a plugin_addr + * @param local_address_info the local address for the address + * @param session_id session id, can be 0 + * @param in_use #GNUNET_YES if #GNUNET_NO FIXME + * @return #GNUNET_SYSERR on failure (address unknown ...) */ int GAS_addresses_in_use (struct GAS_Addresses_Handle *handle, 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); + const char *plugin_name, + const void *plugin_addr, + size_t plugin_addr_len, + uint32_t local_address_info, + uint32_t session_id, + int in_use); + +/** + * Update an address with a session or performance information for a peer. + * + * If an address was added without a session it will be updated with the + * session + * + * @param handle the address handle to use + * @param peer peer + * @param plugin_name transport plugin name + * @param plugin_addr plugin address + * @param plugin_addr_len length of the plugin address + * @param local_address_info the local address for the address + * @param session_id session id, can be 0 + * @param atsi performance information for this address + * @param atsi_count number of performance information contained in @a atsi + */ void GAS_addresses_update (struct GAS_Addresses_Handle *handle, const struct GNUNET_PeerIdentity *peer, - const char *plugin_name, const void *plugin_addr, - size_t plugin_addr_len, uint32_t session_id, + 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_Information *atsi, uint32_t atsi_count); +/** + * Remove an address or just a session for a peer. + * + * @param handle the address handle to use + * @param peer peer + * @param plugin_name transport plugin name + * @param plugin_addr plugin address + * @param plugin_addr_len length of the plugin address in @a plugin_addr + * @param session_id session id, can be 0 + * @param local_address_info the local address for the address + */ void GAS_addresses_destroy (struct GAS_Addresses_Handle *handle, const struct GNUNET_PeerIdentity *peer, - const char *plugin_name, const void *plugin_addr, - size_t plugin_addr_len, uint32_t session_id); + const char *plugin_name, + const void *plugin_addr, + size_t plugin_addr_len, + uint32_t local_address_info, + uint32_t session_id); +/** + * Remove all addresses + * + * @param handle the address handle to use + */ void GAS_addresses_destroy_all (struct GAS_Addresses_Handle *handle); +/** + * Request address suggestions for a peer + * + * @param handle the address handle + * @param peer the peer id + */ +void +GAS_addresses_request_address (struct GAS_Addresses_Handle *handle, + const struct GNUNET_PeerIdentity *peer); + + /** * Cancel address suggestions for a peer * - * @param peer the respective peer + * @param handle the address handle + * @param peer the peer id */ void GAS_addresses_request_address_cancel (struct GAS_Addresses_Handle *handle, const struct GNUNET_PeerIdentity *peer); + +/** + * Reset suggestion backoff for a peer + * + * Suggesting addresses is blocked for ATS_BLOCKING_DELTA. Blocking can be + * reset using this function + * + * @param handle the address handle + * @param peer the peer id + */ void -GAS_addresses_request_address (struct GAS_Addresses_Handle *handle, - const struct GNUNET_PeerIdentity *peer); +GAS_addresses_handle_backoff_reset (struct GAS_Addresses_Handle *handle, + const struct GNUNET_PeerIdentity *peer); + + +/** + * A performance client disconnected + * + * @param handle address handle + * @param client the client + */ +void +GAS_addresses_preference_client_disconnect (struct GAS_Addresses_Handle *handle, + void *client); + +/** + * Change the preference for a peer + * + * @param handle the address handle + * @param client the client sending this request + * @param peer the peer id + * @param kind the preference kind to change + * @param score_abs the new preference score + */ void -GAS_addresses_change_preference (struct GAS_Addresses_Handle *handle, +GAS_addresses_preference_change (struct GAS_Addresses_Handle *handle, + void *client, const struct GNUNET_PeerIdentity *peer, enum GNUNET_ATS_PreferenceKind kind, - float score); + float score_abs); + +/** + * Application feedback on how good preference requirements are fulfilled + * for a specific preference in the given time scope [now - scope .. now] + * + * An application notifies ATS if (and only if) it has feedback information + * for a specific property. This value is valid until the feedback score is + * updated by the application. + * + * If the application has no feedback for this preference kind the application + * will not explicitly call. + * + * @param handle the address handle + * @param application the application sending this request + * @param peer the peer id + * @param scope the time interval this valid for: [now - scope .. now] + * @param kind the preference kind this feedback is intended for + * @param score_abs the new preference score + */ void -GAS_addresses_add (struct GAS_Addresses_Handle *handle, - 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); +GAS_addresses_preference_feedback (struct GAS_Addresses_Handle *handle, + void *application, + const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_TIME_Relative scope, + enum GNUNET_ATS_PreferenceKind kind, + float score_abs); -typedef void (*GNUNET_ATS_Peer_Iterator) (void *p_it_cls, - const struct GNUNET_PeerIdentity *id); +/** + * Iterator for #GAS_addresses_iterate_peers() + * + * @param p_it_cls closure + * @param id the peer id + */ +typedef void +(*GNUNET_ATS_Peer_Iterator) (void *p_it_cls, + const struct GNUNET_PeerIdentity *id); + /** * Return all peers currently known to ATS * + * @param handle the address handle to use * @param p_it the iterator to call for every peer - * @param p_it_cls the closure for the iterator + * @param p_it_cls the closure for @a p_it */ void GAS_addresses_iterate_peers (struct GAS_Addresses_Handle *handle, GNUNET_ATS_Peer_Iterator p_it, void *p_it_cls); -typedef void (*GNUNET_ATS_PeerInfo_Iterator) (void *p_it_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_Information *atsi, - uint32_t atsi_count, - struct GNUNET_BANDWIDTH_Value32NBO - bandwidth_out, - struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in); + +/** + * Iterator for #GAS_addresses_get_peer_info() + * + * @param p_it_cls closure 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 atsi_count number of ats performance elements in @a atsi + * @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 *p_it_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_Information *atsi, + uint32_t atsi_count, + struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out, + struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in); + /** * Return information all peers currently known to ATS * + * @param handle the address handle to use * @param peer the respective peer * @param pi_it the iterator to call for every peer - * @param pi_it_cls the closure for the iterator + * @param pi_it_cls the closure for @a pi_it */ void GAS_addresses_get_peer_info (struct GAS_Addresses_Handle *handle,