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22 * @file ats/plugin_ats_proportional.c
23 * @brief ATS proportional solver
24 * @author Matthias Wachs
25 * @author Christian Grothoff
28 #include "gnunet_statistics_service.h"
29 #include "gnunet_ats_plugin.h"
30 #include "gnunet_ats_service.h"
31 #include "gnunet-service-ats_addresses.h"
33 #define PROP_STABILITY_FACTOR 1.25
36 #define LOG(kind,...) GNUNET_log_from (kind, "ats-proportional",__VA_ARGS__)
41 * NOTE: Do not change this documentation. This documentation is based
42 * on gnunet.org:/vcs/fsnsg/ats-paper.git/tech-doku/ats-tech-guide.tex
43 * use build_txt.sh to generate plaintext output
45 * ATS addresses : proportional solver
47 * The proportional solver ("proportional") distributes the available
48 * bandwidth fair over all the addresses influenced by the
49 * preference values. For each available network type an in- and
50 * outbound quota is configured and the bandwidth available in
51 * these networks is distributed over the addresses. The solver
52 * first assigns every addresses the minimum amount of bandwidth
53 * #GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT and then distributes the
54 * remaining bandwidth available according to the preference
55 * values. For each peer only a single address gets bandwidth
56 * assigned and only one address marked as active. The most
57 * important functionality for the solver is implemented in: *
58 * find_address_it is an hashmap iterator returning the prefered
59 * address for an peer * update_quota_per_network distributes
60 * available bandwidth for a network over active addresses
62 * Changes to addresses automatically have an impact on the the
63 * bandwidth assigned to other addresses in the same network since
64 * the solver distributes the remaining bandwidth over the
65 * addresses in the network. When changes to the addresses occur,
66 * the solver first performs the changes, like adding or deleting
67 * addresses, and then updates bandwidth assignment for the
68 * affected network. Bandwidth assignment is only recalculated on
69 * demand when an address is requested by a client for a peer or
70 * when the addresses available have changed or an address changed
71 * the network it is located in. When the bandwidth assignment has
72 * changed the callback is called with the new bandwidth
73 * assignments. The bandwidth distribution for a network is
74 * recalculated due to: * address suggestion requests * address
75 * deletions * address switching networks during address update *
78 * 3.1 Data structures used
80 * For each ATS network (e.g. WAN, LAN, loopback) a struct Network
81 * is used to specify network related information as total adresses
82 * and active addresses in this network and the configured in- and
83 * outbound quota. Each network also contains a list of addresses
84 * added to the solver located in this network. The proportional
85 * solver uses the addresses' solver_information field to store the
86 * proportional network it belongs to for each address.
90 * When the proportional solver is initialized the solver creates a
91 * new solver handle and initializes the network structures with
92 * the quotas passed from addresses and returns the handle solver.
94 * 3.3 Adding an address
96 * When a new address is added to the solver using s_add, a lookup
97 * for the network for this address is done and the address is
98 * enqueued in in the linked list of the network.
100 * 3.4 Updating an address
102 * The main purpose of address updates is to update the ATS
103 * information for addresse selection. Important for the proportional
104 * solver is when an address switches network it is located
105 * in. This is common because addresses added by transport's
106 * validation mechanism are commonly located in
107 * #GNUNET_ATS_NET_UNSPECIFIED. Addresses in validation are located
108 * in this network type and only if a connection is successful on
109 * return of payload data transport switches to the real network
110 * the address is located in. When an address changes networks it
111 * is first of all removed from the old network using the solver
112 * API function #GAS_proportional_address_delete() and the network in
113 * the address struct is updated. A lookup for the respective new
114 * proportional network is done and stored in the addresse's
115 * solver_information field. Next the address is re-added to the
116 * solver using the solver API function
117 * #GAS_proportional_address_add(). If the address was marked as in
118 * active, the solver checks if bandwidth is available in the
119 * network and if yes sets the address to active and updates the
120 * bandwidth distribution in this network. If no bandwidth is
121 * available it sets the bandwidth for this address to 0 and tries
122 * to suggest an alternative address. If an alternative address was
123 * found, addresses' callback is called for this address.
125 * 3.5 Deleting an address
127 * When an address is removed from the solver, it removes the
128 * respective address from the network and if the address was
129 * marked as active, it updates the bandwidth distribution for this
132 * 3.6 Requesting addresses
134 * When an address is requested for a peer the solver performs a
135 * lookup for the peer entry in addresses address hashmap and
136 * selects the best address. The selection of the most suitable
137 * address is done in the find_address_it hashmap iterator
138 * described in detail in section 3.7. If no address is returned,
139 * no address can be suggested at the moment. If the address
140 * returned is marked as active, the solver can return this
141 * address. If the address is not marked as active, the solver
142 * checks if another address belongign to this peer is marked as
143 * active and marks the address as inactive, updates the bandwidth
144 * for this address to 0, call the bandwidth changed callback for
145 * this address due to the change and updates quota assignment for
146 * the addresse's network. the now in-active address is belonging
147 * to. The solver marks the new address as active and updates the
148 * bandwidth assignment for this network.
150 * 3.7 Choosing addresses
152 * Choosing the best possible address for suggestion is done by
153 * iterating over all addresses of a peer stored in addresses'
154 * hashmap and using the hashmap iterator find_address_it to select
155 * the best available address. Several checks are done when an
156 * address is selected. First if this address is currently blocked
157 * by addresses from being suggested. An address is blocked for the
158 * duration of #ATS_BLOCKING_DELTA when it is suggested to
159 * transport. Next it is checked if at least
160 * #GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT bytes bandwidth is available
161 * in the addresse's network, because suggesting an address without
162 * bandwidth does not make sense. This also ensures that all active
163 * addresses in this network get at least the minimum amount of
164 * bandwidth assigned. In the next step the solver ensures that for
165 * tcp connections inbound connections are prefered over outbound
166 * connections. In the next stet the solver ensures that
167 * connections are prefered in the following order: * connections
168 * are already established and have bandwidth assigned *
169 * connections with a shorter distance * connectes have a shorter
172 * 3.8 Changing preferences
176 * During shutdown all network entries and aging processes are
177 * destroyed and freed.
182 * This solver assigns in and outbound bandwidth equally for all
183 * addresses in specific network type (WAN, LAN) based on configured
184 * in and outbound quota for this network.
186 * The solver is notified by addresses about changes to the addresses
187 * and recalculates the bandwith assigned if required. The solver
188 * notifies addresses by calling the GAS_bandwidth_changed_cb
196 * For each peer only a single is selected and marked as "active" in the address
201 * You have the networks WAN and LAN and quotas
202 * WAN_TOTAL_IN, WAN_TOTAL_OUT
203 * LAN_TOTAL_IN, LAN_TOTAL_OUT
205 * If you have x addresses in the network segment LAN, the quotas are
206 * QUOTA_PER_ADDRESS = LAN_TOTAL_OUT / x
208 * Quotas are automatically recalculated and reported back when addresses are
213 #define PROPORTIONALITY_FACTOR 2.0
216 * A handle for the proportional solver
218 struct GAS_PROPORTIONAL_Handle
222 * Our execution environment.
224 struct GNUNET_ATS_PluginEnvironment *env;
227 * Hashmap containing all valid addresses
229 struct GNUNET_CONTAINER_MultiPeerMap *addresses;
232 * Pending address requests
234 struct GNUNET_CONTAINER_MultiPeerMap *requests;
242 * Number of changes while solver was locked
247 * Total number of addresses for solver
249 unsigned int total_addresses;
252 * Number of active addresses for solver
254 unsigned int active_addresses;
259 struct Network *network_entries;
264 unsigned int network_count;
267 * Proportionality factor
274 double stability_factor;
278 * Representation of a network
285 enum GNUNET_ATS_Network_Type type;
288 * Network description
293 * Total inbound quota
295 unsigned long long total_quota_in;
298 * Total outbound quota
300 unsigned long long total_quota_out;
303 * Number of active addresses for this network
305 unsigned int active_addresses;
308 * Number of total addresses for this network
310 unsigned int total_addresses;
313 * String for statistics total addresses
318 * String for statistics active addresses
323 * Linked list of addresses in this network: head
325 struct AddressWrapper *head;
328 * Linked list of addresses in this network: tail
330 struct AddressWrapper *tail;
334 * Address information stored in the solver
336 struct AddressSolverInformation
339 * Network scope this address is in
341 struct Network *network;
346 uint32_t calculated_quota_in;
351 uint32_t calculated_quota_out;
354 * When was this address activated
356 struct GNUNET_TIME_Absolute activated;
361 * Wrapper for addresses to store them in network's linked list
363 struct AddressWrapper
368 struct AddressWrapper *next;
373 struct AddressWrapper *prev;
378 struct ATS_Address *addr;
383 * Function used to unload the plugin.
385 * @param cls return value from #libgnunet_plugin_ats_proportional_init()
388 libgnunet_plugin_ats_proportional_done (void *cls)
390 struct GNUNET_ATS_SolverFunctions *sf = cls;
391 struct GAS_PROPORTIONAL_Handle *s = sf->cls;
392 struct AddressWrapper *cur;
393 struct AddressWrapper *next;
396 for (c = 0; c < s->network_count; c++)
398 if (s->network_entries[c].total_addresses > 0)
400 LOG(GNUNET_ERROR_TYPE_DEBUG,
401 "Had %u addresses for network `%s' not deleted during shutdown\n",
402 s->network_entries[c].total_addresses, s->network_entries[c].desc);
406 if (s->network_entries[c].active_addresses > 0)
408 LOG(GNUNET_ERROR_TYPE_DEBUG,
409 "Had %u active addresses for network `%s' not deleted during shutdown\n",
410 s->network_entries[c].active_addresses, s->network_entries[c].desc);
414 next = s->network_entries[c].head;
415 while (NULL != (cur = next))
418 GNUNET_CONTAINER_DLL_remove(s->network_entries[c].head,
419 s->network_entries[c].tail, cur);
420 GNUNET_free_non_null (cur->addr->solver_information);
423 GNUNET_free(s->network_entries[c].stat_total);
424 GNUNET_free(s->network_entries[c].stat_active);
426 if (s->total_addresses > 0)
428 LOG(GNUNET_ERROR_TYPE_DEBUG,
429 "Had %u addresses not deleted during shutdown\n", s->total_addresses);
432 if (s->active_addresses > 0)
434 LOG(GNUNET_ERROR_TYPE_DEBUG,
435 "Had %u active addresses not deleted during shutdown\n",
436 s->active_addresses);
439 GNUNET_free (s->network_entries);
440 GNUNET_CONTAINER_multipeermap_destroy (s->requests);
447 * Test if bandwidth is available in this network to add an additional address
449 * @param net the network type to update
450 * @return #GNUNET_YES or #GNUNET_NO
453 is_bandwidth_available_in_network (struct Network *net)
455 GNUNET_assert(NULL != net);
456 unsigned int na = net->active_addresses + 1;
457 uint32_t min_bw = ntohl (GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT.value__);
458 if (((net->total_quota_in / na) > min_bw)
459 && ((net->total_quota_out / na) > min_bw))
461 LOG(GNUNET_ERROR_TYPE_DEBUG,
462 "Enough bandwidth available for %u active addresses in network `%s'\n",
467 LOG(GNUNET_ERROR_TYPE_DEBUG,
468 "Not enough bandwidth available for %u active addresses in network `%s'\n",
475 * Update bandwidth assigned to peers in this network
477 * @param s the solver handle
478 * @param net the network type to update
482 distribute_bandwidth (struct GAS_PROPORTIONAL_Handle *s,
485 struct AddressSolverInformation *asi;
486 struct AddressWrapper *cur_address;
487 unsigned long long remaining_quota_in = 0;
488 unsigned long long quota_out_used = 0;
489 unsigned long long remaining_quota_out = 0;
490 unsigned long long quota_in_used = 0;
492 uint32_t min_bw = ntohl (GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT.value__);
493 double relative_peer_prefence;
494 double sum_relative_peer_prefences; /* Important: has to be double not float due to precision */
495 double cur_pref; /* Important: has to be double not float due to precision */
498 const double *peer_relative_prefs = NULL; /* Important: has to be double not float due to precision */
500 uint32_t assigned_quota_in = 0;
501 uint32_t assigned_quota_out = 0;
504 LOG (GNUNET_ERROR_TYPE_INFO,
505 "Recalculate quota for network type `%s' for %u addresses (in/out): %llu/%llu \n",
507 net->active_addresses,
509 net->total_quota_in);
511 if (net->active_addresses == 0)
513 return; /* no addresses to update */
517 * Assign every peer in network minimum Bandwidth
518 * Distribute bandwidth left according to preference
521 if ((net->active_addresses * min_bw) > net->total_quota_in)
526 if ((net->active_addresses * min_bw) > net->total_quota_out)
532 remaining_quota_in = net->total_quota_in - (net->active_addresses * min_bw);
533 remaining_quota_out = net->total_quota_out - (net->active_addresses * min_bw);
534 LOG(GNUNET_ERROR_TYPE_DEBUG, "Remaining bandwidth : (in/out): %llu/%llu \n",
535 remaining_quota_in, remaining_quota_out);
536 sum_relative_peer_prefences = 0.0;
538 /* Calculate sum of relative preference for active addresses in this network */
540 for (cur_address = net->head; NULL != cur_address; cur_address = cur_address->next)
542 if (GNUNET_YES != cur_address->addr->active)
545 peer_relative_prefs = s->env->get_preferences (s->env->cls,
546 &cur_address->addr->peer);
547 relative_peer_prefence = 0.0;
548 relative_peer_prefence += peer_relative_prefs[GNUNET_ATS_PREFERENCE_BANDWIDTH];
549 sum_relative_peer_prefences += relative_peer_prefence;
553 if (count_addresses != net->active_addresses)
556 LOG (GNUNET_ERROR_TYPE_WARNING,
557 "%s: Counted %u active addresses, but network says to have %u active addresses\n",
558 net->desc, count_addresses, net->active_addresses);
559 for (cur_address = net->head; NULL != cur_address; cur_address = cur_address->next)
561 if (GNUNET_YES != cur_address->addr->active)
564 LOG (GNUNET_ERROR_TYPE_WARNING,
565 "Active: `%s' `%s' length %u\n",
566 GNUNET_i2s (&cur_address->addr->peer),
567 cur_address->addr->plugin,
568 cur_address->addr->addr_len);
572 LOG (GNUNET_ERROR_TYPE_INFO,
573 "Total relative preference %.3f for %u addresses in network %s\n",
574 sum_relative_peer_prefences, net->active_addresses, net->desc);
576 for (cur_address = net->head; NULL != cur_address; cur_address = cur_address->next)
578 if (GNUNET_YES == cur_address->addr->active)
580 peer_relative_prefs = s->env->get_preferences (s->env->cls,
581 &cur_address->addr->peer);
583 cur_pref = peer_relative_prefs[GNUNET_ATS_PREFERENCE_BANDWIDTH];
584 total_weight = net->active_addresses +
585 s->prop_factor * sum_relative_peer_prefences;
586 peer_weight = (1.0 + (s->prop_factor * cur_pref));
588 assigned_quota_in = min_bw
589 + ((peer_weight / total_weight) * remaining_quota_in);
590 assigned_quota_out = min_bw
591 + ((peer_weight / total_weight) * remaining_quota_out);
593 LOG (GNUNET_ERROR_TYPE_INFO,
594 "New quota for peer `%s' with weight (cur/total) %.3f/%.3f (in/out): %llu / %llu\n",
595 GNUNET_i2s (&cur_address->addr->peer), peer_weight, total_weight,
596 assigned_quota_in, assigned_quota_out);
600 assigned_quota_in = 0;
601 assigned_quota_out = 0;
604 quota_in_used += assigned_quota_in;
605 quota_out_used += assigned_quota_out;
606 /* Prevent overflow due to rounding errors */
607 if (assigned_quota_in > UINT32_MAX)
608 assigned_quota_in = UINT32_MAX;
609 if (assigned_quota_out > UINT32_MAX)
610 assigned_quota_out = UINT32_MAX;
612 /* Compare to current bandwidth assigned */
613 asi = cur_address->addr->solver_information;
614 asi->calculated_quota_in = assigned_quota_in;
615 asi->calculated_quota_out = assigned_quota_out;
617 LOG(GNUNET_ERROR_TYPE_DEBUG,
618 "Total bandwidth assigned is (in/out): %llu /%llu\n", quota_in_used,
620 if (quota_out_used > net->total_quota_out + 1) /* +1 is required due to rounding errors */
622 LOG(GNUNET_ERROR_TYPE_ERROR,
623 "Total outbound bandwidth assigned is larger than allowed (used/allowed) for %u active addresses: %llu / %llu\n",
624 net->active_addresses, quota_out_used, net->total_quota_out);
626 if (quota_in_used > net->total_quota_in + 1) /* +1 is required due to rounding errors */
628 LOG(GNUNET_ERROR_TYPE_ERROR,
629 "Total inbound bandwidth assigned is larger than allowed (used/allowed) for %u active addresses: %llu / %llu\n",
630 net->active_addresses, quota_in_used, net->total_quota_in);
636 * Context for finding the best address* Linked list of addresses in this network: head
638 struct FindBestAddressCtx
643 struct GAS_PROPORTIONAL_Handle *s;
646 * The currently best address
648 struct ATS_Address *best;
653 * Find index of a ATS property type in the array.
656 find_property_index (uint32_t type)
658 int existing_types[] = GNUNET_ATS_QualityProperties;
661 for (c = 0; c < GNUNET_ATS_QualityPropertiesCount; c++)
662 if (existing_types[c] == type)
664 return GNUNET_SYSERR;
669 * Find a "good" address to use for a peer by iterating over the addresses for this peer.
670 * If we already have an existing address, we stick to it.
671 * Otherwise, we pick by lowest distance and then by lowest latency.
673 * @param cls the `struct FindBestAddressCtx *' where we store the result
675 * @param value another `struct ATS_Address*` to consider using
676 * @return #GNUNET_OK (continue to iterate)
679 find_best_address_it (void *cls,
680 const struct GNUNET_PeerIdentity *key,
683 struct FindBestAddressCtx *ctx = cls;
684 struct ATS_Address *current = value;
685 struct ATS_Address *current_best = current;
686 struct AddressSolverInformation *asi;
687 struct GNUNET_TIME_Relative active_time;
688 struct GNUNET_TIME_Relative min_active_time;
690 double best_distance;
696 asi = current->solver_information;
703 if (GNUNET_NO == is_bandwidth_available_in_network (asi->network))
705 return GNUNET_OK; /* There's no bandwidth available in this network */
708 if (NULL != ctx->best)
710 /* Compare current addresses with denominated 'best' address */
711 current_best = ctx->best;
715 /* We do not have a 'best' address so take this address */
716 LOG (GNUNET_ERROR_TYPE_DEBUG,
717 "Setting initial address %p\n",
719 current_best = current;
723 if (GNUNET_YES == current->active)
725 GNUNET_assert (asi->activated.abs_value_us != GNUNET_TIME_UNIT_ZERO_ABS.abs_value_us);
726 active_time = GNUNET_TIME_absolute_get_duration (asi->activated);
727 min_active_time.rel_value_us = ((double) GNUNET_TIME_UNIT_SECONDS.rel_value_us) *
728 ctx->s->stability_factor;
729 if (active_time.rel_value_us <= min_active_time.rel_value_us)
731 /* Keep active address for stability reasons */
737 /* Now compare ATS information */
738 index = find_property_index (GNUNET_ATS_QUALITY_NET_DISTANCE);
739 cur_distance = current->atsin[index].norm;
740 best_distance = ctx->best->atsin[index].norm;
741 index = find_property_index (GNUNET_ATS_QUALITY_NET_DELAY);
742 cur_delay = current->atsin[index].norm;
743 best_delay = ctx->best->atsin[index].norm;
745 /* user shorter distance */
746 if (cur_distance < best_distance)
748 if (GNUNET_NO == ctx->best->active)
750 current_best = current; /* Use current */
752 else if ((best_distance / cur_distance) > ctx->s->stability_factor)
754 /* Best and active address performs worse */
755 current_best = current;
760 /* Use current best */
761 current_best = ctx->best;
764 /* User connection with less delay */
765 if (cur_delay < best_delay)
768 if (GNUNET_NO == ctx->best->active)
770 current_best = current; /* Use current */
772 else if ((best_delay / cur_delay) > ctx->s->stability_factor)
774 /* Best and active address performs worse */
775 current_best = current;
780 /* Use current best */
781 current_best = ctx->best;
785 ctx->best = current_best;
791 * Find the currently best address for a peer from the set of addresses available
792 * or return NULL of no address is available
794 * @param s the proportional handle
795 * @param addresses the address hashmap
796 * @param id the peer id
797 * @return the address or NULL
800 get_best_address (struct GAS_PROPORTIONAL_Handle *s,
801 struct GNUNET_CONTAINER_MultiPeerMap *addresses,
802 const struct GNUNET_PeerIdentity *id)
804 struct FindBestAddressCtx fba_ctx;
808 GNUNET_CONTAINER_multipeermap_get_multiple (addresses,
810 &find_best_address_it,
817 * Hashmap Iterator to find current active address for peer
819 * @param cls last active address
820 * @param key peer's key
821 * @param value address to check
822 * @return #GNUNET_NO on double active address else #GNUNET_YES;
825 get_active_address_it (void *cls,
826 const struct GNUNET_PeerIdentity *key,
829 struct ATS_Address **dest = cls;
830 struct ATS_Address *aa = (struct ATS_Address *) value;
832 LOG (GNUNET_ERROR_TYPE_INFO,
833 "Checking address %p\n", aa);
835 if (GNUNET_YES == aa->active)
837 LOG (GNUNET_ERROR_TYPE_INFO,
838 "Address %p is active\n", aa);
841 /* should never happen */
842 LOG (GNUNET_ERROR_TYPE_ERROR,
843 "Multiple active addresses for peer `%s'\n",
844 GNUNET_i2s (&aa->peer));
856 * Find current active address for peer
858 * @param solver the solver handle
859 * @param addresses the address set
860 * @param peer the peer
861 * @return active address or NULL
863 static struct ATS_Address *
864 get_active_address (void *solver,
865 const struct GNUNET_CONTAINER_MultiPeerMap * addresses,
866 const struct GNUNET_PeerIdentity *peer)
868 static struct ATS_Address *dest;
871 GNUNET_CONTAINER_multipeermap_get_multiple (addresses, peer,
872 &get_active_address_it,
879 * Lookup network struct by type
881 * @param s the solver handle
882 * @param type the network type
883 * @return the network struct
885 static struct Network *
886 get_network (struct GAS_PROPORTIONAL_Handle *s,
887 enum GNUNET_ATS_Network_Type type)
889 if (type >= s->env->network_count)
894 return &s->network_entries[type];
899 * Increase address count in network
901 * @param s the solver handle
902 * @param net the network type
903 * @param total increase total addresses
904 * @param active increase active addresses
907 address_increment (struct GAS_PROPORTIONAL_Handle *s,
912 if (GNUNET_YES == total)
914 s->total_addresses++;
915 net->total_addresses++;
916 GNUNET_STATISTICS_update (s->env->stats,
917 "# ATS addresses total", 1, GNUNET_NO);
918 GNUNET_STATISTICS_update (s->env->stats,
919 net->stat_total, 1, GNUNET_NO);
921 if (GNUNET_YES == active)
923 net->active_addresses++;
924 s->active_addresses++;
925 GNUNET_STATISTICS_update (s->env->stats,
926 "# ATS active addresses total", 1,
928 GNUNET_STATISTICS_update (s->env->stats,
929 net->stat_active, 1, GNUNET_NO);
936 * Decrease address count in network
938 * @param s the solver handle
939 * @param net the network type
940 * @param total decrease total addresses
941 * @param active decrease active addresses
944 addresse_decrement (struct GAS_PROPORTIONAL_Handle *s,
951 if (GNUNET_YES == total)
953 if (s->total_addresses < 1)
960 s->total_addresses--;
961 GNUNET_STATISTICS_update (s->env->stats,
962 "# ATS addresses total", -1,
965 if (net->total_addresses < 1)
972 net->total_addresses--;
973 GNUNET_STATISTICS_update (s->env->stats,
974 net->stat_total, -1, GNUNET_NO);
978 if (GNUNET_YES == active)
980 if (net->active_addresses < 1)
987 net->active_addresses--;
988 GNUNET_STATISTICS_update (s->env->stats,
989 net->stat_active, -1, GNUNET_NO);
991 if (s->active_addresses < 1)
998 s->active_addresses--;
999 GNUNET_STATISTICS_update (s->env->stats,
1000 "# ATS addresses total", -1,
1009 * Compares addresses
1011 * @param a address a
1012 * @param b address b
1013 * @return GNUNET_YES if equal, GNUNET_NO else
1016 address_eq (struct ATS_Address *a, struct ATS_Address *b)
1018 GNUNET_assert (NULL != a);
1019 GNUNET_assert (NULL != b);
1020 if (0 != strcmp(a->plugin, b->plugin))
1022 if (a->addr_len != b->addr_len)
1024 if (0 != memcmp (a->addr, b->addr, b->addr_len))
1026 if (a->session_id != b->session_id)
1033 * Notify bandwidth changes to addresses
1035 * @param s solver handle
1036 * @param net the network to propagate changes in
1039 propagate_bandwidth (struct GAS_PROPORTIONAL_Handle *s,
1040 struct Network *net)
1042 struct AddressWrapper *cur;
1043 struct AddressSolverInformation *asi;
1045 for (cur = net->head; NULL != cur; cur = cur->next)
1047 asi = cur->addr->solver_information;
1048 if ( (cur->addr->assigned_bw_in != asi->calculated_quota_in) ||
1049 (cur->addr->assigned_bw_out != asi->calculated_quota_out) )
1051 cur->addr->assigned_bw_in = asi->calculated_quota_in;
1052 cur->addr->assigned_bw_out = asi->calculated_quota_out;
1054 /* Reset for next iteration */
1055 asi->calculated_quota_in = 0;
1056 asi->calculated_quota_out = 0;
1057 LOG (GNUNET_ERROR_TYPE_DEBUG,
1058 "Bandwidth for %s address %p for peer `%s' changed to %u/%u\n",
1059 (GNUNET_NO == cur->addr->active) ? "inactive" : "active",
1061 GNUNET_i2s (&cur->addr->peer),
1062 cur->addr->assigned_bw_in,
1063 cur->addr->assigned_bw_out);
1065 /* Notify on change */
1066 if ((GNUNET_YES == cur->addr->active))
1068 s->env->bandwidth_changed_cb (s->env->cls,
1077 * Distribibute bandwidth
1079 * @param s the solver handle
1080 * @param n the network, can be NULL for all network
1083 distribute_bandwidth_in_network (struct GAS_PROPORTIONAL_Handle *s,
1086 if (GNUNET_YES == s->bulk_lock)
1094 LOG (GNUNET_ERROR_TYPE_INFO,
1095 "Redistributing bandwidth in network %s with %u active and %u total addresses\n",
1096 GNUNET_ATS_print_network_type(n->type),
1097 n->active_addresses, n->total_addresses);
1099 s->env->info_cb (s->env->cls,
1102 GAS_INFO_PROP_SINGLE);
1105 distribute_bandwidth(s, n);
1107 s->env->info_cb (s->env->cls,
1110 GAS_INFO_PROP_SINGLE);
1111 s->env->info_cb (s->env->cls,
1112 GAS_OP_SOLVE_UPDATE_NOTIFICATION_START,
1114 GAS_INFO_PROP_SINGLE);
1116 /* Do propagation */
1117 propagate_bandwidth (s, n);
1119 s->env->info_cb (s->env->cls,
1120 GAS_OP_SOLVE_UPDATE_NOTIFICATION_STOP,
1122 GAS_INFO_PROP_SINGLE);
1127 s->env->info_cb (s->env->cls,
1131 for (i = 0; i < s->network_count; i++)
1134 distribute_bandwidth(s, &s->network_entries[i]);
1137 s->env->info_cb (s->env->cls,
1141 s->env->info_cb (s->env->cls,
1142 GAS_OP_SOLVE_UPDATE_NOTIFICATION_START,
1145 for (i = 0; i < s->network_count; i++)
1147 /* Do propagation */
1148 propagate_bandwidth(s, &s->network_entries[i]);
1150 s->env->info_cb (s->env->cls,
1151 GAS_OP_SOLVE_UPDATE_NOTIFICATION_STOP,
1159 * Update active address for a peer:
1160 * Check if active address exists and what the best address is, if addresses
1161 * are different switch
1163 * @param s solver handle
1164 * @param peer the peer to check
1165 * return the new address or NULL if no update was performed
1167 static struct ATS_Address *
1168 update_active_address (struct GAS_PROPORTIONAL_Handle *s,
1169 const struct GNUNET_PeerIdentity *peer)
1171 struct ATS_Address *best_address;
1172 struct ATS_Address *current_address;
1173 struct AddressSolverInformation *asi;
1174 struct Network *net;
1176 LOG (GNUNET_ERROR_TYPE_INFO,
1177 "Updating active address for peer `%s'\n",
1180 /* Find active address */
1181 current_address = get_active_address (s,
1185 LOG (GNUNET_ERROR_TYPE_INFO,
1186 "Peer `%s' has active address %p\n",
1190 /* Find best address */
1191 best_address = get_best_address (s,
1194 LOG (GNUNET_ERROR_TYPE_INFO,
1195 "Peer `%s' has best address %p\n",
1199 if (NULL != current_address)
1201 if ( (NULL == best_address) ||
1202 ( (NULL != best_address) &&
1203 (GNUNET_NO == address_eq (current_address,
1206 /* We switch to a new address (or to none),
1207 mark old address as inactive */
1208 LOG (GNUNET_ERROR_TYPE_INFO,
1209 "Disabling previous %s address %p for peer `%s'\n",
1210 (GNUNET_NO == current_address->active) ? "inactive" : "active",
1214 asi = current_address->solver_information;
1215 GNUNET_assert (NULL != asi);
1218 asi->activated = GNUNET_TIME_UNIT_ZERO_ABS;
1219 current_address->active = GNUNET_NO; /* No active any longer */
1220 current_address->assigned_bw_in = 0; /* no bandwidth assigned */
1221 current_address->assigned_bw_out = 0; /* no bandwidth assigned */
1223 if (GNUNET_SYSERR == addresse_decrement (s, net, GNUNET_NO, GNUNET_YES))
1226 /* Update network of previous address */
1227 distribute_bandwidth_in_network (s, net);
1229 if (NULL == best_address)
1231 /* We previously had an active address, but now we cannot suggest one
1232 * Therefore we have to disconnect the peer */
1233 LOG (GNUNET_ERROR_TYPE_INFO,
1234 "Disconnecting peer `%s' with previous address %p\n",
1237 s->env->bandwidth_changed_cb (s->env->cls,
1241 if (NULL == best_address)
1243 LOG (GNUNET_ERROR_TYPE_INFO,
1244 "Cannot suggest address for peer `%s'\n",
1249 LOG (GNUNET_ERROR_TYPE_INFO,
1250 "Suggesting new address %p for peer `%s'\n",
1254 if ( (NULL != current_address) &&
1255 (GNUNET_YES == address_eq (best_address, current_address)) )
1257 GNUNET_break (GNUNET_NO != current_address->active);
1258 return best_address; /* Same same */
1261 asi = best_address->solver_information;
1262 GNUNET_assert (NULL != asi);
1265 /* Mark address as active */
1266 asi->activated = GNUNET_TIME_absolute_get ();
1267 best_address->active = GNUNET_YES;
1268 address_increment (s, net, GNUNET_NO, GNUNET_YES);
1269 LOG (GNUNET_ERROR_TYPE_INFO,
1270 "Address %p for peer `%s' is now active\n",
1273 /* Distribute bandwidth */
1274 distribute_bandwidth_in_network (s, net);
1275 return best_address;
1280 * Changes the preferences for a peer in the problem
1282 * @param solver the solver handle
1283 * @param peer the peer to change the preference for
1284 * @param kind the kind to change the preference
1285 * @param pref_rel the normalized preference value for this kind over all clients
1288 GAS_proportional_address_change_preference (void *solver,
1289 const struct GNUNET_PeerIdentity *peer,
1290 enum GNUNET_ATS_PreferenceKind kind,
1293 struct GAS_PROPORTIONAL_Handle *s = solver;
1294 struct ATS_Address *best_address;
1295 struct ATS_Address *active_address;
1296 struct AddressSolverInformation *asi;
1299 GNUNET_CONTAINER_multipeermap_contains (s->requests, peer))
1300 return; /* Peer is not requested */
1302 /* This peer is requested, find best address */
1303 active_address = get_active_address (s, s->addresses, peer);
1304 best_address = update_active_address (s, peer);
1306 if ((NULL != best_address) && ((NULL != active_address) &&
1307 (GNUNET_YES == address_eq (active_address, best_address))))
1309 asi = best_address->solver_information;
1310 GNUNET_assert (NULL != asi);
1312 /* We sticked to the same address, therefore redistribute */
1313 distribute_bandwidth_in_network (s, asi->network);
1319 * Get application feedback for a peer
1321 * @param solver the solver handle
1322 * @param application the application
1323 * @param peer the peer to change the preference for
1324 * @param scope the time interval for this feedback: [now - scope .. now]
1325 * @param kind the kind to change the preference
1326 * @param score the score
1329 GAS_proportional_address_preference_feedback (void *solver,
1330 struct GNUNET_SERVER_Client *application,
1331 const struct GNUNET_PeerIdentity *peer,
1332 const struct GNUNET_TIME_Relative scope,
1333 enum GNUNET_ATS_PreferenceKind kind,
1336 struct GAS_PROPORTIONAL_Handle *s = solver;
1338 GNUNET_assert(NULL != peer);
1339 GNUNET_assert(NULL != s);
1344 * Get the preferred address for a specific peer
1346 * @param solver the solver handle
1347 * @param peer the identity of the peer
1348 * @return best address
1350 static const struct ATS_Address *
1351 GAS_proportional_get_preferred_address (void *solver,
1352 const struct GNUNET_PeerIdentity *peer)
1354 struct GAS_PROPORTIONAL_Handle *s = solver;
1355 const struct ATS_Address *best_address;
1357 /* Add to list of pending requests */
1359 GNUNET_CONTAINER_multipeermap_contains (s->requests, peer))
1361 GNUNET_assert (GNUNET_OK ==
1362 GNUNET_CONTAINER_multipeermap_put (s->requests,
1365 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1366 LOG (GNUNET_ERROR_TYPE_INFO,
1367 "Start suggesting addresses for peer `%s'\n",
1371 best_address = update_active_address (s, peer);
1372 if (s->bulk_lock > 0)
1373 return NULL; /* Do not suggest since bulk lock is pending */
1375 return best_address;
1380 * Stop notifying about address and bandwidth changes for this peer
1382 * @param solver the solver handle
1383 * @param peer the peer
1386 GAS_proportional_stop_get_preferred_address (void *solver,
1387 const struct GNUNET_PeerIdentity *peer)
1389 struct GAS_PROPORTIONAL_Handle *s = solver;
1390 struct ATS_Address *cur;
1391 struct AddressSolverInformation *asi;
1392 struct Network *cur_net;
1395 GNUNET_CONTAINER_multipeermap_contains (s->requests, peer))
1397 GNUNET_assert (GNUNET_OK ==
1398 GNUNET_CONTAINER_multipeermap_remove (s->requests,
1401 LOG (GNUNET_ERROR_TYPE_INFO,
1402 "Stop suggesting addresses for peer `%s'\n",
1406 cur = get_active_address (s,
1411 LOG (GNUNET_ERROR_TYPE_INFO,
1412 "Disabling %s address %p for peer `%s'\n",
1413 (GNUNET_NO == cur->active) ? "inactive" : "active",
1415 GNUNET_i2s (&cur->peer));
1417 /* Disabling current address */
1418 asi = cur->solver_information;
1419 cur_net = asi->network ;
1420 asi->activated = GNUNET_TIME_UNIT_ZERO_ABS;
1421 cur->active = GNUNET_NO; /* No active any longer */
1422 cur->assigned_bw_in = 0; /* no bandwidth assigned */
1423 cur->assigned_bw_out = 0; /* no bandwidth assigned */
1425 if (GNUNET_SYSERR ==
1426 addresse_decrement (s, cur_net, GNUNET_NO, GNUNET_YES))
1429 distribute_bandwidth_in_network (s, cur_net);
1435 * Remove an address from the solver
1437 * @param solver the solver handle
1438 * @param address the address to remove
1439 * @param session_only delete only session not whole address
1442 GAS_proportional_address_delete (void *solver,
1443 struct ATS_Address *address,
1446 struct GAS_PROPORTIONAL_Handle *s = solver;
1447 struct Network *net;
1448 struct AddressWrapper *aw;
1449 struct AddressSolverInformation *asi;
1451 /* Remove an adress completely, we have to:
1452 * - Remove from specific network
1453 * - Decrease number of total addresses
1455 * - decrease number of active addreses
1458 asi = address->solver_information;
1467 if (GNUNET_NO == session_only)
1469 LOG (GNUNET_ERROR_TYPE_INFO,
1470 "Deleting %s address %p for peer `%s' from network `%s' (total: %u/ active: %u)\n",
1471 (GNUNET_NO == address->active) ? "inactive" : "active",
1473 GNUNET_i2s (&address->peer),
1475 net->total_addresses,
1476 net->active_addresses);
1478 /* Remove address */
1479 addresse_decrement (s, net, GNUNET_YES, GNUNET_NO);
1480 for (aw = net->head; NULL != aw; aw = aw->next)
1482 if (aw->addr == address)
1490 GNUNET_CONTAINER_DLL_remove (net->head,
1497 /* Remove session only: remove if active and update */
1498 LOG (GNUNET_ERROR_TYPE_INFO,
1499 "Deleting %s session %p for peer `%s' from network `%s' (total: %u/ active: %u)\n",
1500 (GNUNET_NO == address->active) ? "inactive" : "active",
1502 GNUNET_i2s (&address->peer),
1504 net->total_addresses,
1505 net->active_addresses);
1508 if (GNUNET_YES == address->active)
1510 /* Address was active, remove from network and update quotas*/
1511 address->active = GNUNET_NO;
1512 address->assigned_bw_in = 0;
1513 address->assigned_bw_out = 0;
1514 asi->calculated_quota_in = 0;
1515 asi->calculated_quota_out = 0;
1517 if (GNUNET_SYSERR ==
1518 addresse_decrement (s, net, GNUNET_NO, GNUNET_YES))
1520 distribute_bandwidth_in_network (s, net);
1523 update_active_address (s, &address->peer))
1525 /* No alternative address found, disconnect peer */
1526 LOG (GNUNET_ERROR_TYPE_INFO,
1527 "Disconnecting peer `%s' after deleting previous address %p\n",
1528 GNUNET_i2s (&address->peer),
1530 s->env->bandwidth_changed_cb (s->env->cls,
1534 if (GNUNET_NO == session_only)
1536 GNUNET_free_non_null (address->solver_information);
1537 address->solver_information = NULL;
1540 LOG (GNUNET_ERROR_TYPE_INFO,
1541 "After deleting address now total %u and active %u addresses in network `%s'\n",
1542 net->total_addresses,
1543 net->active_addresses,
1549 * Start a bulk operation
1551 * @param solver the solver
1554 GAS_proportional_bulk_start (void *solver)
1556 struct GAS_PROPORTIONAL_Handle *s = solver;
1558 LOG (GNUNET_ERROR_TYPE_DEBUG,
1559 "Locking solver for bulk operation ...\n");
1560 GNUNET_assert (NULL != solver);
1566 * Bulk operation done
1569 GAS_proportional_bulk_stop (void *solver)
1571 struct GAS_PROPORTIONAL_Handle *s = solver;
1573 LOG (GNUNET_ERROR_TYPE_DEBUG,
1574 "Unlocking solver from bulk operation ...\n");
1575 if (s->bulk_lock < 1)
1581 if ((0 == s->bulk_lock) && (0 < s->bulk_requests))
1583 LOG(GNUNET_ERROR_TYPE_INFO, "No lock pending, recalculating\n");
1584 distribute_bandwidth_in_network (s, NULL);
1585 s->bulk_requests = 0;
1591 * Add a new single address to a network
1593 * @param solver the solver Handle
1594 * @param address the address to add
1595 * @param network network type of this address
1598 GAS_proportional_address_add (void *solver,
1599 struct ATS_Address *address,
1604 * Transport properties for this address have changed
1606 * @param solver solver handle
1607 * @param address the address
1608 * @param type the ATSI type in HBO
1609 * @param abs_value the absolute value of the property
1610 * @param rel_value the normalized value
1613 GAS_proportional_address_property_changed (void *solver,
1614 struct ATS_Address *address,
1615 enum GNUNET_ATS_Property type,
1619 struct GAS_PROPORTIONAL_Handle *s = solver;
1621 struct AddressSolverInformation *asi;
1622 struct ATS_Address *best_address;
1623 struct ATS_Address *active_address;
1625 asi = address->solver_information;
1639 LOG(GNUNET_ERROR_TYPE_INFO,
1640 "Property `%s' for peer `%s' address %p changed to %.2f \n",
1641 GNUNET_ATS_print_property_type (type), GNUNET_i2s (&address->peer),
1642 address, rel_value);
1644 if (GNUNET_NO == GNUNET_CONTAINER_multipeermap_contains (s->requests, &address->peer))
1645 return; /* Peer is not requested */
1647 /* This peer is requested, find active and best address */
1648 active_address = get_active_address(s, s->addresses, &address->peer);
1649 best_address = update_active_address (s,
1652 if ((NULL != best_address) && ((NULL != active_address) &&
1653 (GNUNET_YES == address_eq (active_address, best_address))))
1655 asi = best_address->solver_information;
1656 GNUNET_assert (NULL != asi);
1658 /* We sticked to the same address, therefore redistribute */
1659 distribute_bandwidth_in_network (s, asi->network);
1665 * Add a new single address to a network
1667 * @param solver the solver Handle
1668 * @param address the address to add
1669 * @param network network type of this address
1672 GAS_proportional_address_add (void *solver,
1673 struct ATS_Address *address,
1674 enum GNUNET_ATS_Network_Type network)
1676 struct GAS_PROPORTIONAL_Handle *s = solver;
1677 struct Network *net;
1678 struct AddressWrapper *aw;
1679 struct AddressSolverInformation *asi;
1681 net = get_network (s, network);
1685 LOG (GNUNET_ERROR_TYPE_ERROR,
1686 "Unknown network %u `%s' for new address %p for peer `%s'\n",
1688 GNUNET_ATS_print_network_type (network),
1690 GNUNET_i2s (&address->peer));
1694 aw = GNUNET_new (struct AddressWrapper);
1696 GNUNET_CONTAINER_DLL_insert(net->head, net->tail, aw);
1697 address_increment (s, net, GNUNET_YES, GNUNET_NO);
1699 asi = GNUNET_new (struct AddressSolverInformation);
1701 asi->calculated_quota_in = 0;
1702 asi->calculated_quota_out = 0;
1703 aw->addr->solver_information = asi;
1705 LOG(GNUNET_ERROR_TYPE_INFO,
1706 "Adding new address %p for peer `%s', now total %u and active %u addresses in network `%s'\n",
1707 address, GNUNET_i2s(&address->peer), net->total_addresses, net->active_addresses, net->desc);
1709 if (GNUNET_NO == GNUNET_CONTAINER_multipeermap_contains (s->requests, &address->peer))
1710 return; /* Peer is not requested */
1712 /* This peer is requested, find best address */
1713 update_active_address (s, &address->peer);
1719 * Function invoked when the plugin is loaded.
1721 * @param[in,out] cls the `struct GNUNET_ATS_PluginEnvironment *` to use;
1722 * modified to return the API functions (ugh).
1723 * @return the `struct GAS_PROPORTIONAL_Handle` to pass as a closure
1726 libgnunet_plugin_ats_proportional_init (void *cls)
1728 static struct GNUNET_ATS_SolverFunctions sf;
1729 struct GNUNET_ATS_PluginEnvironment *env = cls;
1730 struct GAS_PROPORTIONAL_Handle *s;
1731 struct Network * cur;
1735 GNUNET_assert (NULL != env);
1736 GNUNET_assert (NULL != env->cfg);
1737 GNUNET_assert (NULL != env->bandwidth_changed_cb);
1738 GNUNET_assert (NULL != env->get_preferences);
1740 s = GNUNET_new (struct GAS_PROPORTIONAL_Handle);
1743 sf.s_add = &GAS_proportional_address_add;
1744 sf.s_address_update_property = &GAS_proportional_address_property_changed;
1745 sf.s_get = &GAS_proportional_get_preferred_address;
1746 sf.s_get_stop = &GAS_proportional_stop_get_preferred_address;
1747 sf.s_pref = &GAS_proportional_address_change_preference;
1748 sf.s_feedback = &GAS_proportional_address_preference_feedback;
1749 sf.s_del = &GAS_proportional_address_delete;
1750 sf.s_bulk_start = &GAS_proportional_bulk_start;
1751 sf.s_bulk_stop = &GAS_proportional_bulk_stop;
1753 s->network_entries = GNUNET_malloc (env->network_count * sizeof (struct Network));
1756 s->active_addresses = 0;
1757 s->total_addresses = 0;
1758 s->bulk_lock = GNUNET_NO;
1759 s->addresses = env->addresses;
1760 s->requests = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
1762 s->stability_factor = PROP_STABILITY_FACTOR;
1763 if (GNUNET_SYSERR !=
1764 GNUNET_CONFIGURATION_get_value_float (env->cfg, "ats",
1765 "PROP_STABILITY_FACTOR", &f_tmp))
1767 if ((f_tmp < 1.0) || (f_tmp > 2.0))
1769 LOG (GNUNET_ERROR_TYPE_ERROR,
1770 _("Invalid %s configuration %f \n"),
1771 "PROP_STABILITY_FACTOR",
1776 s->stability_factor = f_tmp;
1777 LOG (GNUNET_ERROR_TYPE_INFO,
1778 "Using %s of %.3f\n",
1779 "PROP_STABILITY_FACTOR", f_tmp);
1783 s->prop_factor = PROPORTIONALITY_FACTOR;
1784 if (GNUNET_SYSERR !=
1785 GNUNET_CONFIGURATION_get_value_float (env->cfg, "ats",
1786 "PROP_PROPORTIONALITY_FACTOR",
1791 LOG (GNUNET_ERROR_TYPE_ERROR,
1792 _("Invalid %s configuration %f \n"),
1793 "PROP_PROPORTIONALITY_FACTOR", f_tmp);
1797 s->prop_factor = f_tmp;
1798 LOG (GNUNET_ERROR_TYPE_INFO,
1799 "Using %s of %.3f\n",
1800 "PROP_PROPORTIONALITY_FACTOR", f_tmp);
1804 for (c = 0; c < env->network_count; c++)
1806 cur = &s->network_entries[c];
1808 cur->total_quota_in = env->in_quota[c];
1809 cur->total_quota_out = env->out_quota[c];
1810 cur->desc = GNUNET_ATS_print_network_type (c);
1811 GNUNET_asprintf (&cur->stat_total,
1812 "# ATS addresses %s total",
1814 GNUNET_asprintf (&cur->stat_active,
1815 "# ATS active addresses %s total",
1817 LOG (GNUNET_ERROR_TYPE_INFO,
1818 "Added network %u `%s' (%llu/%llu)\n",
1821 cur->total_quota_in,
1822 cur->total_quota_out);
1828 /* end of plugin_ats_proportional.c */