2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
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22 * @file ats/gnunet-service-ats-solver_proportional.c
23 * @brief ATS proportional solver
24 * @author Matthias Wachs
25 * @author Christian Grothoff
28 #include "gnunet_util_lib.h"
29 #include "gnunet-service-ats_addresses.h"
30 #include "gnunet_statistics_service.h"
32 #define LOG(kind,...) GNUNET_log_from (kind, "ats-proportional",__VA_ARGS__)
36 * NOTE: Do not change this documentation. This documentation is based
37 * on gnunet.org:/vcs/fsnsg/ats-paper.git/tech-doku/ats-tech-guide.tex
38 * use build_txt.sh to generate plaintext output
40 * ATS addresses : simplistic solver
42 * The simplistic solver ("simplistic") distributes the available
43 * bandwidth fair over all the addresses influenced by the
44 * preference values. For each available network type an in- and
45 * outbound quota is configured and the bandwidth available in
46 * these networks is distributed over the addresses. The solver
47 * first assigns every addresses the minimum amount of bandwidth
48 * GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT and then distributes the
49 * remaining bandwidth available according to the preference
50 * values. For each peer only a single address gets bandwidth
51 * assigned and only one address marked as active. The most
52 * important functionality for the solver is implemented in: *
53 * find_address_it is an hashmap iterator returning the prefered
54 * address for an peer * update_quota_per_network distributes
55 * available bandwidth for a network over active addresses
57 * Changes to addresses automatically have an impact on the the
58 * bandwidth assigned to other addresses in the same network since
59 * the solver distributes the remaining bandwidth over the
60 * addresses in the network. When changes to the addresses occur,
61 * the solver first performs the changes, like adding or deleting
62 * addresses, and then updates bandwidth assignment for the
63 * affected network. Bandwidth assignment is only recalculated on
64 * demand when an address is requested by a client for a peer or
65 * when the addresses available have changed or an address changed
66 * the network it is located in. When the bandwidth assignment has
67 * changed the callback is called with the new bandwidth
68 * assignments. The bandwidth distribution for a network is
69 * recalculated due to: * address suggestion requests * address
70 * deletions * address switching networks during address update *
73 * 3.1 Data structures used
75 * For each ATS network (e.g. WAN, LAN, loopback) a struct Network
76 * is used to specify network related information as total adresses
77 * and active addresses in this network and the configured in- and
78 * outbound quota. Each network also contains a list of addresses
79 * added to the solver located in this network. The simplistic
80 * solver uses the addresses' solver_information field to store the
81 * simplistic network it belongs to for each address.
85 * When the simplistic solver is initialized the solver creates a
86 * new solver handle and initializes the network structures with
87 * the quotas passed from addresses and returns the handle solver.
89 * 3.3 Adding an address
91 * When a new address is added to the solver using s_add, a lookup
92 * for the network for this address is done and the address is
93 * enqueued in in the linked list of the network.
95 * 3.4 Updating an address
97 * The main purpose of address updates is to update the ATS
98 * information for addresse selection. Important for the simplistic
99 * solver is when an address switches network it is located
100 * in. This is common because addresses added by transport's
101 * validation mechanism are commonly located in
102 * GNUNET_ATS_NET_UNSPECIFIED. Addresses in validation are located
103 * in this network type and only if a connection is successful on
104 * return of payload data transport switches to the real network
105 * the address is located in. When an address changes networks it
106 * is first of all removed from the old network using the solver
107 * API function GAS_simplistic_address_delete and the network in
108 * the address struct is updated. A lookup for the respective new
109 * simplistic network is done and stored in the addresse's
110 * solver_information field. Next the address is re-added to the
111 * solver using the solver API function
112 * GAS_simplistic_address_add. If the address was marked as in
113 * active, the solver checks if bandwidth is available in the
114 * network and if yes sets the address to active and updates the
115 * bandwidth distribution in this network. If no bandwidth is
116 * available it sets the bandwidth for this address to 0 and tries
117 * to suggest an alternative address. If an alternative address was
118 * found, addresses' callback is called for this address.
120 * 3.5 Deleting an address
122 * When an address is removed from the solver, it removes the
123 * respective address from the network and if the address was
124 * marked as active, it updates the bandwidth distribution for this
127 * 3.6 Requesting addresses
129 * When an address is requested for a peer the solver performs a
130 * lookup for the peer entry in addresses address hashmap and
131 * selects the best address. The selection of the most suitable
132 * address is done in the find_address_it hashmap iterator
133 * described in detail in section 3.7. If no address is returned,
134 * no address can be suggested at the moment. If the address
135 * returned is marked as active, the solver can return this
136 * address. If the address is not marked as active, the solver
137 * checks if another address belongign to this peer is marked as
138 * active and marks the address as inactive, updates the bandwidth
139 * for this address to 0, call the bandwidth changed callback for
140 * this address due to the change and updates quota assignment for
141 * the addresse's network. the now in-active address is belonging
142 * to. The solver marks the new address as active and updates the
143 * bandwidth assignment for this network.
145 * 3.7 Choosing addresses
147 * Choosing the best possible address for suggestion is done by
148 * iterating over all addresses of a peer stored in addresses'
149 * hashmap and using the hashmap iterator find_address_it to select
150 * the best available address. Several checks are done when an
151 * address is selected. First if this address is currently blocked
152 * by addresses from being suggested. An address is blocked for the
153 * duration of ATS_BLOCKING_DELTA when it is suggested to
154 * transport. Next it is checked if at least
155 * GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT bytes bandwidth is available
156 * in the addresse's network, because suggesting an address without
157 * bandwidth does not make sense. This also ensures that all active
158 * addresses in this network get at least the minimum amount of
159 * bandwidth assigned. In the next step the solver ensures that for
160 * tcp connections inbound connections are prefered over outbound
161 * connections. In the next stet the solver ensures that
162 * connections are prefered in the following order: * connections
163 * are already established and have bandwidth assigned *
164 * connections with a shorter distance * connectes have a shorter
167 * 3.8 Changing preferences
171 * During shutdown all network entries and aging processes are
172 * destroyed and freed.
177 * This solver assigns in and outbound bandwidth equally for all
178 * addresses in specific network type (WAN, LAN) based on configured
179 * in and outbound quota for this network.
181 * The solver is notified by addresses about changes to the addresses
182 * and recalculates the bandwith assigned if required. The solver
183 * notifies addresses by calling the GAS_bandwidth_changed_cb
191 * For each peer only a single is selected and marked as "active" in the address
196 * You have the networks WAN and LAN and quotas
197 * WAN_TOTAL_IN, WAN_TOTAL_OUT
198 * LAN_TOTAL_IN, LAN_TOTAL_OUT
200 * If you have x addresses in the network segment LAN, the quotas are
201 * QUOTA_PER_ADDRESS = LAN_TOTAL_OUT / x
203 * Quotas are automatically recalculated and reported back when addresses are
208 #define PREF_AGING_INTERVAL GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
209 #define PREF_AGING_FACTOR 0.95
211 #define DEFAULT_REL_PREFERENCE 1.0
212 #define DEFAULT_ABS_PREFERENCE 0.0
213 #define MIN_UPDATE_INTERVAL GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
217 * A handle for the proportional solver
219 struct GAS_PROPORTIONAL_Handle
224 struct GNUNET_STATISTICS_Handle *stats;
227 * Bandwidth changed callback
229 GAS_bandwidth_changed_cb bw_changed;
232 * Bandwidth changed callback cls
234 void *bw_changed_cls;
237 * ATS function to get preferences
239 GAS_get_preferences get_preferences;
242 * Closure for ATS function to get preferences
244 void *get_preferences_cls;
252 * Number of changes while solver was locked
258 * Total number of addresses for solver
260 unsigned int total_addresses;
263 * Number of active addresses for solver
265 unsigned int active_addresses;
270 struct Network *network_entries;
275 unsigned int networks;
281 * Representation of a network
291 * Network description
296 * Total inbound quota
299 unsigned long long total_quota_in;
302 * Total outbound quota
305 unsigned long long total_quota_out;
308 * Number of active addresses for this network
310 unsigned int active_addresses;
313 * Number of total addresses for this network
315 unsigned int total_addresses;
318 * String for statistics total addresses
323 * String for statistics active addresses
327 struct AddressWrapper *head;
328 struct AddressWrapper *tail;
333 * Wrapper for addresses to store them in network's linked list
335 struct AddressWrapper
340 struct AddressWrapper *next;
345 struct AddressWrapper *prev;
350 struct ATS_Address *addr;
356 * Important solver functions
357 * ---------------------------
361 * Test if bandwidth is available in this network to add an additional address
363 * @param net the network type to update
364 * @return GNUNET_YES or GNUNET_NO
367 is_bandwidth_available_in_network (struct Network *net)
369 GNUNET_assert (NULL != net);
370 unsigned int na = net->active_addresses + 1;
371 uint32_t min_bw = ntohl (GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT.value__);
372 if (((net->total_quota_in / na) > min_bw) &&
373 ((net->total_quota_out / na) > min_bw))
375 LOG (GNUNET_ERROR_TYPE_DEBUG,
376 "Enough bandwidth available for %u active addresses in network `%s'\n",
382 LOG (GNUNET_ERROR_TYPE_DEBUG,
383 "Not enough bandwidth available for %u active addresses in network `%s'\n",
391 * Update bandwidth assigned to peers in this network
393 * @param s the solver handle
394 * @param net the network type to update
395 * @param address_except address excluded from notification, since we suggest
399 distribute_bandwidth_in_network (struct GAS_PROPORTIONAL_Handle *s,
401 struct ATS_Address *address_except)
403 unsigned long long remaining_quota_in = 0;
404 unsigned long long quota_out_used = 0;
406 unsigned long long remaining_quota_out = 0;
407 unsigned long long quota_in_used = 0;
408 uint32_t min_bw = ntohl (GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT.value__);
410 double total_prefs; /* Important: has to be double not float due to precision */
411 double cur_pref; /* Important: has to be double not float due to precision */
412 const double *t = NULL; /* Important: has to be double not float due to precision */
415 unsigned long long assigned_quota_in = 0;
416 unsigned long long assigned_quota_out = 0;
417 struct AddressWrapper *cur;
419 LOG (GNUNET_ERROR_TYPE_DEBUG,
420 "Recalculate quota for network type `%s' for %u addresses (in/out): %llu/%llu \n",
421 net->desc, net->active_addresses, net->total_quota_in, net->total_quota_in);
423 if (net->active_addresses == 0)
424 return; /* no addresses to update */
427 * Assign every peer in network minimum Bandwidth
428 * Distribute bandwidth left according to preference
431 if ((net->active_addresses * min_bw) > net->total_quota_in)
436 if ((net->active_addresses * min_bw) > net->total_quota_out)
442 remaining_quota_in = net->total_quota_in - (net->active_addresses * min_bw);
443 remaining_quota_out = net->total_quota_out - (net->active_addresses * min_bw);
444 LOG (GNUNET_ERROR_TYPE_DEBUG, "Remaining bandwidth : (in/out): %llu/%llu \n",
445 remaining_quota_in, remaining_quota_out);
447 for (cur = net->head; NULL != cur; cur = cur->next)
449 if (GNUNET_YES == cur->addr->active)
451 GNUNET_assert (NULL != (t = s->get_preferences (s->get_preferences_cls, &cur->addr->peer)));
454 for (c = 0; c < GNUNET_ATS_PreferenceCount; c++)
456 if (c != GNUNET_ATS_PREFERENCE_END)
458 //fprintf (stderr, "VALUE[%u] %s %.3f \n", c, GNUNET_i2s (&cur->addr->peer), t[c]);
462 total_prefs += (peer_prefs / (GNUNET_ATS_PreferenceCount -1));
465 for (cur = net->head; NULL != cur; cur = cur->next)
467 if (GNUNET_YES == cur->addr->active)
470 GNUNET_assert (NULL != (t = s->get_preferences (s->get_preferences_cls, &cur->addr->peer)));
472 for (c = 0; c < GNUNET_ATS_PreferenceCount; c++)
474 if (c != GNUNET_ATS_PREFERENCE_END)
479 assigned_quota_in = min_bw + ((cur_pref / total_prefs) * remaining_quota_in);
480 assigned_quota_out = min_bw + ((cur_pref / total_prefs) * remaining_quota_out);
482 LOG (GNUNET_ERROR_TYPE_DEBUG,
483 "New quota for peer `%s' with preference (cur/total) %.3f/%.3f (in/out): %llu / %llu\n",
484 GNUNET_i2s (&cur->addr->peer),
485 cur_pref, total_prefs,
486 assigned_quota_in, assigned_quota_out);
490 assigned_quota_in = 0;
491 assigned_quota_out = 0;
494 quota_in_used += assigned_quota_in;
495 quota_out_used += assigned_quota_out;
496 /* Prevent overflow due to rounding errors */
497 if (assigned_quota_in > UINT32_MAX)
498 assigned_quota_in = UINT32_MAX;
499 if (assigned_quota_out > UINT32_MAX)
500 assigned_quota_out = UINT32_MAX;
502 /* Compare to current bandwidth assigned */
503 if ((assigned_quota_in != ntohl(cur->addr->assigned_bw_in.value__)) ||
504 (assigned_quota_out != ntohl(cur->addr->assigned_bw_out.value__)))
506 cur->addr->assigned_bw_in.value__ = htonl (assigned_quota_in);
507 cur->addr->assigned_bw_out.value__ = htonl (assigned_quota_out);
508 /* Notify on change */
509 if ((GNUNET_YES == cur->addr->active) && (cur->addr != address_except))
510 s->bw_changed (s->bw_changed_cls, cur->addr);
514 LOG (GNUNET_ERROR_TYPE_DEBUG,
515 "Total bandwidth assigned is (in/out): %llu /%llu\n",
518 if (quota_out_used > net->total_quota_out + 1) /* +1 is required due to rounding errors */
520 LOG (GNUNET_ERROR_TYPE_ERROR,
521 "Total outbound bandwidth assigned is larger than allowed (used/allowed) for %u active addresses: %llu / %llu\n",
522 net->active_addresses,
524 net->total_quota_out);
526 if (quota_in_used > net->total_quota_in + 1) /* +1 is required due to rounding errors */
528 LOG (GNUNET_ERROR_TYPE_ERROR,
529 "Total inbound bandwidth assigned is larger than allowed (used/allowed) for %u active addresses: %llu / %llu\n",
530 net->active_addresses,
532 net->total_quota_in);
538 * Extract an ATS performance info from an address
540 * @param address the address
541 * @param type the type to extract in HBO
542 * @return the value in HBO or GNUNET_ATS_VALUE_UNDEFINED in HBO if value does not exist
545 get_performance_info (struct ATS_Address *address, uint32_t type);
548 * Find a "good" address to use for a peer by iterating over the addresses for this peer.
549 * If we already have an existing address, we stick to it.
550 * Otherwise, we pick by lowest distance and then by lowest latency.
552 * @param cls the 'struct ATS_Address**' where we store the result
554 * @param value another 'struct ATS_Address*' to consider using
555 * @return GNUNET_OK (continue to iterate)
558 find_best_address_it (void *cls, const struct GNUNET_HashCode * key, void *value)
560 struct ATS_Address **previous_p = cls;
561 struct ATS_Address *current = (struct ATS_Address *) value;
562 struct ATS_Address *previous = *previous_p;
563 struct GNUNET_TIME_Absolute now;
564 struct Network *net = (struct Network *) current->solver_information;
565 uint32_t p_distance_cur;
566 uint32_t p_distance_prev;
567 uint32_t p_delay_cur;
568 uint32_t p_delay_prev;
570 now = GNUNET_TIME_absolute_get();
572 if (current->blocked_until.abs_value == GNUNET_TIME_absolute_max (now, current->blocked_until).abs_value)
574 /* This address is blocked for suggestion */
575 LOG (GNUNET_ERROR_TYPE_DEBUG,
576 "Address %p blocked for suggestion for %llu ms \n",
578 GNUNET_TIME_absolute_get_difference(now, current->blocked_until).rel_value);
582 if (GNUNET_NO == is_bandwidth_available_in_network (net))
583 return GNUNET_OK; /* There's no bandwidth available in this network */
585 if (NULL != previous)
587 GNUNET_assert (NULL != previous->plugin);
588 GNUNET_assert (NULL != current->plugin);
589 if (0 == strcmp (previous->plugin, current->plugin))
591 if ((0 != previous->addr_len) &&
592 (0 == current->addr_len))
594 /* saved address was an outbound address, but we have an inbound address */
595 *previous_p = current;
598 if (0 == previous->addr_len)
600 /* saved address was an inbound address, so do not overwrite */
606 if (NULL == previous)
608 *previous_p = current;
611 if ((ntohl (previous->assigned_bw_in.value__) == 0) &&
612 (ntohl (current->assigned_bw_in.value__) > 0))
614 /* stick to existing connection */
615 *previous_p = current;
619 p_distance_prev = get_performance_info (previous, GNUNET_ATS_QUALITY_NET_DISTANCE);
620 p_distance_cur = get_performance_info (current, GNUNET_ATS_QUALITY_NET_DISTANCE);
621 if ((p_distance_prev != GNUNET_ATS_VALUE_UNDEFINED) && (p_distance_cur != GNUNET_ATS_VALUE_UNDEFINED) &&
622 (p_distance_prev > p_distance_cur))
624 /* user shorter distance */
625 *previous_p = current;
629 p_delay_prev = get_performance_info (previous, GNUNET_ATS_QUALITY_NET_DELAY);
630 p_delay_cur = get_performance_info (current, GNUNET_ATS_QUALITY_NET_DELAY);
631 if ((p_delay_prev != GNUNET_ATS_VALUE_UNDEFINED) && (p_delay_cur != GNUNET_ATS_VALUE_UNDEFINED) &&
632 (p_delay_prev > p_delay_cur))
634 /* user lower latency */
635 *previous_p = current;
645 * ---------------------------
649 * Update bandwidth assignment for all networks
651 * @param s the solver handle
654 distribute_bandwidth_in_all_networks (struct GAS_PROPORTIONAL_Handle *s)
657 for (i = 0; i < s->networks; i++)
658 distribute_bandwidth_in_network (s, &s->network_entries[i], NULL);
664 * Lookup network struct by type
666 * @param s the solver handle
667 * @param type the network type
668 * @return the network struct
670 static struct Network *
671 get_network (struct GAS_PROPORTIONAL_Handle *s, uint32_t type)
674 for (c = 0 ; c < s->networks; c++)
676 if (s->network_entries[c].type == type)
677 return &s->network_entries[c];
685 * Hashmap Iterator to find current active address for peer
687 * @param cls last active address
688 * @param key peer's key
689 * @param value address to check
690 * @return GNUNET_NO on double active address else GNUNET_YES
693 get_active_address_it (void *cls, const struct GNUNET_HashCode * key, void *value)
695 struct ATS_Address * dest = (struct ATS_Address *) (*(struct ATS_Address **)cls);
696 struct ATS_Address * aa = (struct ATS_Address *) value;
698 if (GNUNET_YES == aa->active)
702 /* should never happen */
703 LOG (GNUNET_ERROR_TYPE_ERROR, "Multiple active addresses for peer `%s'\n", GNUNET_i2s (&aa->peer));
714 * Find current active address for peer
716 * @param solver the solver handle
717 * @param addresses the address set
718 * @param peer the peer
719 * @return active address or NULL
721 static struct ATS_Address *
722 get_active_address (void *solver,
723 struct GNUNET_CONTAINER_MultiHashMap * addresses,
724 const struct GNUNET_PeerIdentity *peer)
726 struct ATS_Address * dest = NULL;
728 GNUNET_CONTAINER_multihashmap_get_multiple(addresses,
730 &get_active_address_it, &dest);
737 addresse_increment (struct GAS_PROPORTIONAL_Handle *s,
742 if (GNUNET_YES == total)
744 s->total_addresses ++;
745 net->total_addresses ++;
746 GNUNET_STATISTICS_update (s->stats, "# ATS addresses total", 1, GNUNET_NO);
747 GNUNET_STATISTICS_update (s->stats, net->stat_total, 1, GNUNET_NO);
749 if (GNUNET_YES == active)
751 net->active_addresses ++;
752 s->active_addresses ++;
753 GNUNET_STATISTICS_update (s->stats, "# ATS active addresses total", 1, GNUNET_NO);
754 GNUNET_STATISTICS_update (s->stats, net->stat_active, 1, GNUNET_NO);
761 addresse_decrement (struct GAS_PROPORTIONAL_Handle *s,
767 if (GNUNET_YES == total)
769 if (s->total_addresses < 1)
776 s->total_addresses --;
777 GNUNET_STATISTICS_update (s->stats, "# ATS addresses total", -1, GNUNET_NO);
779 if (net->total_addresses < 1)
786 net->total_addresses --;
787 GNUNET_STATISTICS_update (s->stats, net->stat_total, -1, GNUNET_NO);
791 if (GNUNET_YES == active)
793 if (net->active_addresses < 1)
800 net->active_addresses --;
801 GNUNET_STATISTICS_update (s->stats, net->stat_active, -1, GNUNET_NO);
803 if (s->active_addresses < 1)
810 s->active_addresses --;
811 GNUNET_STATISTICS_update (s->stats, "# ATS addresses total", -1, GNUNET_NO);
819 * Extract an ATS performance info from an address
821 * @param address the address
822 * @param type the type to extract in HBO
823 * @return the value in HBO or GNUNET_ATS_VALUE_UNDEFINED in HBO if value does not exist
826 get_performance_info (struct ATS_Address *address, uint32_t type)
829 GNUNET_assert (NULL != address);
831 if ((NULL == address->atsi) || (0 == address->atsi_count))
832 return GNUNET_ATS_VALUE_UNDEFINED;
834 for (c1 = 0; c1 < address->atsi_count; c1++)
836 if (ntohl(address->atsi[c1].type) == type)
837 return ntohl(address->atsi[c1].value);
839 return GNUNET_ATS_VALUE_UNDEFINED;
844 * Solver API functions
845 * ---------------------------
849 * Changes the preferences for a peer in the problem
851 * @param solver the solver handle
852 * @param addresses the address hashmap
853 * @param peer the peer to change the preference for
854 * @param kind the kind to change the preference
855 * @param pref_rel the normalized preference value for this kind over all clients
858 GAS_proportional_address_change_preference (void *solver,
859 struct GNUNET_CONTAINER_MultiHashMap *addresses,
860 const struct GNUNET_PeerIdentity *peer,
861 enum GNUNET_ATS_PreferenceKind kind,
864 struct GAS_PROPORTIONAL_Handle *s = solver;
865 GNUNET_assert (NULL != solver);
866 GNUNET_assert (NULL != peer);
868 if (GNUNET_NO == s->bulk_lock)
869 distribute_bandwidth_in_all_networks (s);
875 * Get the preferred address for a specific peer
877 * @param solver the solver handle
878 * @param addresses the address hashmap containing all addresses
879 * @param peer the identity of the peer
881 const struct ATS_Address *
882 GAS_proportional_get_preferred_address (void *solver,
883 struct GNUNET_CONTAINER_MultiHashMap * addresses,
884 const struct GNUNET_PeerIdentity *peer)
886 struct GAS_PROPORTIONAL_Handle *s = solver;
887 struct Network *net_prev;
888 struct Network *net_cur;
889 struct ATS_Address *cur;
890 struct ATS_Address *prev;
892 GNUNET_assert (s != NULL);
894 /* Get address with: stick to current address, lower distance, lower latency */
895 GNUNET_CONTAINER_multihashmap_get_multiple (addresses, &peer->hashPubKey,
896 &find_best_address_it, &cur);
899 LOG (GNUNET_ERROR_TYPE_DEBUG, "Cannot suggest address for peer `%s'\n", GNUNET_i2s (peer));
903 LOG (GNUNET_ERROR_TYPE_DEBUG, "Suggesting %s address %p for peer `%s'\n",
904 (GNUNET_NO == cur->active) ? "inactive" : "active",
905 cur, GNUNET_i2s (peer));
906 net_cur = (struct Network *) cur->solver_information;
909 LOG (GNUNET_ERROR_TYPE_ERROR, "Trying to suggesting unknown address peer `%s'\n",
914 if (GNUNET_YES == cur->active)
916 /* This address was selected previously, so no need to update quotas */
920 /* This address was not active, so we have to:
922 * - mark previous active address as not active
923 * - update quota for previous address network
924 * - update quota for this address network
927 prev = get_active_address (s, addresses, peer);
930 net_prev = (struct Network *) prev->solver_information;
931 prev->active = GNUNET_NO; /* No active any longer */
932 prev->assigned_bw_in = GNUNET_BANDWIDTH_value_init (0); /* no bw assigned */
933 prev->assigned_bw_out = GNUNET_BANDWIDTH_value_init (0); /* no bw assigned */
934 s->bw_changed (s->bw_changed_cls, prev); /* notify about bw change, REQUIRED? */
935 if (GNUNET_SYSERR == addresse_decrement (s, net_prev, GNUNET_NO, GNUNET_YES))
937 if (GNUNET_NO == s->bulk_lock)
938 distribute_bandwidth_in_network (s, net_prev, NULL);
943 if (GNUNET_NO == (is_bandwidth_available_in_network (cur->solver_information)))
945 GNUNET_break (0); /* This should never happen*/
949 cur->active = GNUNET_YES;
950 addresse_increment(s, net_cur, GNUNET_NO, GNUNET_YES);
951 if (GNUNET_NO == s->bulk_lock)
952 distribute_bandwidth_in_network (s, net_cur, cur);
961 * Stop notifying about address and bandwidth changes for this peer
963 * @param solver the solver handle
964 * @param addresses address hashmap
965 * @param peer the peer
968 GAS_proportional_stop_get_preferred_address (void *solver,
969 struct GNUNET_CONTAINER_MultiHashMap *addresses,
970 const struct GNUNET_PeerIdentity *peer)
977 * Remove an address from the solver
979 * @param solver the solver handle
980 * @param addresses the address hashmap containing all addresses
981 * @param address the address to remove
982 * @param session_only delete only session not whole address
985 GAS_proportional_address_delete (void *solver,
986 struct GNUNET_CONTAINER_MultiHashMap * addresses,
987 struct ATS_Address *address, int session_only)
989 struct GAS_PROPORTIONAL_Handle *s = solver;
991 struct AddressWrapper *aw;
993 /* Remove an adress completely, we have to:
994 * - Remove from specific network
995 * - Decrease number of total addresses
997 * - decrease number of active addreses
1001 net = (struct Network *) address->solver_information;
1003 if (GNUNET_NO == session_only)
1005 LOG (GNUNET_ERROR_TYPE_DEBUG, "Deleting %s address %p for peer `%s' from network `%s' (total: %u/ active: %u)\n",
1006 (GNUNET_NO == address->active) ? "inactive" : "active",
1007 address, GNUNET_i2s (&address->peer),
1008 net->desc, net->total_addresses, net->active_addresses);
1010 /* Remove address */
1011 addresse_decrement (s, net, GNUNET_YES, GNUNET_NO);
1012 for (aw = net->head; NULL != aw; aw = aw->next)
1014 if (aw->addr == address)
1022 GNUNET_CONTAINER_DLL_remove (net->head, net->tail, aw);
1027 /* Remove session only: remove if active and update */
1028 LOG (GNUNET_ERROR_TYPE_DEBUG, "Deleting %s session %p for peer `%s' from network `%s' (total: %u/ active: %u)\n",
1029 (GNUNET_NO == address->active) ? "inactive" : "active",
1030 address, GNUNET_i2s (&address->peer),
1031 net->desc, net->total_addresses, net->active_addresses);
1034 if (GNUNET_YES == address->active)
1036 /* Address was active, remove from network and update quotas*/
1037 address->active = GNUNET_NO;
1038 if (GNUNET_SYSERR == addresse_decrement (s, net, GNUNET_NO, GNUNET_YES))
1040 if (GNUNET_NO == s->bulk_lock)
1041 distribute_bandwidth_in_network (s, net, NULL);
1045 LOG (GNUNET_ERROR_TYPE_DEBUG, "After deleting address now total %u and active %u addresses in network `%s'\n",
1046 net->total_addresses,
1047 net->active_addresses,
1054 * Start a bulk operation
1056 * @param solver the solver
1059 GAS_proportional_bulk_start (void *solver)
1061 LOG (GNUNET_ERROR_TYPE_ERROR, "Locking solver for bulk operation ...\n");
1062 struct GAS_PROPORTIONAL_Handle *s = (struct GAS_PROPORTIONAL_Handle *) solver;
1064 GNUNET_assert (NULL != solver);
1069 * Bulk operation done
1072 GAS_proportional_bulk_stop (void *solver)
1074 LOG (GNUNET_ERROR_TYPE_ERROR, "Unlocking solver from bulk operation ...\n");
1076 struct GAS_PROPORTIONAL_Handle *s = (struct GAS_PROPORTIONAL_Handle *) solver;
1077 GNUNET_assert (NULL != solver);
1079 if (s->bulk_lock < 1)
1085 if ((0 == s->bulk_lock) && (s->bulk_changes))
1087 LOG (GNUNET_ERROR_TYPE_ERROR, "No lock pending, recalculating\n");
1088 distribute_bandwidth_in_all_networks (s);
1089 s->bulk_changes = 0;
1095 * Add a new single address to a network
1097 * @param solver the solver Handle
1098 * @param addresses the address hashmap containing all addresses
1099 * @param address the address to add
1100 * @param network network type of this address
1103 GAS_proportional_address_add (void *solver,
1104 struct GNUNET_CONTAINER_MultiHashMap *addresses,
1105 struct ATS_Address *address,
1109 * Updates a single address in the solver and checks previous values
1111 * @param solver the solver Handle
1112 * @param addresses the address hashmap containing all addresses
1113 * @param address the update address
1114 * @param session the previous session
1115 * @param in_use the previous address in use state
1116 * @param prev_ats previous ATS information
1117 * @param prev_atsi_count the previous atsi count
1120 GAS_proportional_address_update (void *solver,
1121 struct GNUNET_CONTAINER_MultiHashMap *addresses,
1122 struct ATS_Address *address,
1125 const struct GNUNET_ATS_Information *prev_ats,
1126 uint32_t prev_atsi_count)
1128 struct ATS_Address *new;
1129 struct GAS_PROPORTIONAL_Handle *s = (struct GAS_PROPORTIONAL_Handle *) solver;
1131 uint32_t prev_value;
1134 int save_active = GNUNET_NO;
1135 struct Network *new_net = NULL;
1137 /* Check updates to performance information */
1138 for (i = 0; i < prev_atsi_count; i++)
1140 prev_type = ntohl (prev_ats[i].type);
1141 prev_value = ntohl (prev_ats[i].value);
1144 case GNUNET_ATS_UTILIZATION_UP:
1145 case GNUNET_ATS_UTILIZATION_DOWN:
1146 case GNUNET_ATS_QUALITY_NET_DELAY:
1147 case GNUNET_ATS_QUALITY_NET_DISTANCE:
1148 case GNUNET_ATS_COST_WAN:
1149 case GNUNET_ATS_COST_LAN:
1150 case GNUNET_ATS_COST_WLAN:
1151 /* No actions required here*/
1153 case GNUNET_ATS_NETWORK_TYPE:
1155 addr_net = get_performance_info (address, GNUNET_ATS_NETWORK_TYPE);
1156 if (GNUNET_ATS_VALUE_UNDEFINED == addr_net)
1159 addr_net = GNUNET_ATS_NET_UNSPECIFIED;
1161 if (addr_net != prev_value)
1163 /* Network changed */
1164 LOG (GNUNET_ERROR_TYPE_DEBUG, "Network type changed, moving %s address from `%s' to `%s'\n",
1165 (GNUNET_YES == address->active) ? "active" : "inactive",
1166 GNUNET_ATS_print_network_type(prev_value),
1167 GNUNET_ATS_print_network_type(addr_net));
1169 save_active = address->active;
1170 /* remove from old network */
1171 GAS_proportional_address_delete (solver, addresses, address, GNUNET_NO);
1173 /* set new network type */
1174 new_net = get_network (solver, addr_net);
1175 if (NULL == new_net)
1177 /* Address changed to invalid network... */
1178 LOG (GNUNET_ERROR_TYPE_ERROR, _("Cannot find network of type `%u' %s\n"),
1179 addr_net, GNUNET_ATS_print_network_type (addr_net));
1180 address->assigned_bw_in = GNUNET_BANDWIDTH_value_init (0);
1181 address->assigned_bw_out = GNUNET_BANDWIDTH_value_init (0);
1182 s->bw_changed (s->bw_changed_cls, address);
1185 address->solver_information = new_net;
1187 /* Add to new network and update*/
1188 GAS_proportional_address_add (solver, addresses, address, addr_net);
1189 if (GNUNET_YES == save_active)
1191 /* check if bandwidth available in new network */
1192 if (GNUNET_YES == (is_bandwidth_available_in_network (new_net)))
1194 /* Suggest updated address */
1195 address->active = GNUNET_YES;
1196 addresse_increment (s, new_net, GNUNET_NO, GNUNET_YES);
1197 if (GNUNET_NO == s->bulk_lock)
1198 distribute_bandwidth_in_network (solver, new_net, NULL);
1204 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not enough bandwidth in new network, suggesting alternative address ..\n");
1206 /* Set old address to zero bw */
1207 address->assigned_bw_in = GNUNET_BANDWIDTH_value_init (0);
1208 address->assigned_bw_out = GNUNET_BANDWIDTH_value_init (0);
1209 s->bw_changed (s->bw_changed_cls, address);
1211 /* Find new address to suggest since no bandwidth in network*/
1212 new = (struct ATS_Address *) GAS_proportional_get_preferred_address (s, addresses, &address->peer);
1215 /* Have an alternative address to suggest */
1216 s->bw_changed (s->bw_changed_cls, new);
1224 case GNUNET_ATS_ARRAY_TERMINATOR:
1227 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1228 "Received unsupported ATS type %u\n", prev_type);
1235 if (address->session_id != session)
1237 LOG (GNUNET_ERROR_TYPE_DEBUG,
1238 "Session changed from %u to %u\n", session, address->session_id);
1240 if (address->used != in_use)
1242 LOG (GNUNET_ERROR_TYPE_DEBUG,
1243 "Usage changed from %u to %u\n", in_use, address->used);
1250 * Add a new single address to a network
1252 * @param solver the solver Handle
1253 * @param addresses the address hashmap containing all addresses
1254 * @param address the address to add
1255 * @param network network type of this address
1258 GAS_proportional_address_add (void *solver,
1259 struct GNUNET_CONTAINER_MultiHashMap *addresses,
1260 struct ATS_Address *address,
1263 struct GAS_PROPORTIONAL_Handle *s = solver;
1264 struct Network *net = NULL;
1265 struct AddressWrapper *aw = NULL;
1266 GNUNET_assert (NULL != s);
1268 net = get_network (s, network);
1275 aw = GNUNET_malloc (sizeof (struct AddressWrapper));
1277 GNUNET_CONTAINER_DLL_insert (net->head, net->tail, aw);
1278 addresse_increment (s, net, GNUNET_YES, GNUNET_NO);
1279 aw->addr->solver_information = net;
1281 LOG (GNUNET_ERROR_TYPE_DEBUG, "After adding address now total %u and active %u addresses in network `%s'\n",
1282 net->total_addresses,
1283 net->active_addresses,
1289 * Init the proportional problem solver
1292 * network[i] contains the network type as type GNUNET_ATS_NetworkType[i]
1293 * out_quota[i] contains outbound quota for network type i
1294 * in_quota[i] contains inbound quota for network type i
1297 * network = {GNUNET_ATS_NET_UNSPECIFIED, GNUNET_ATS_NET_LOOPBACK, GNUNET_ATS_NET_LAN, GNUNET_ATS_NET_WAN, GNUNET_ATS_NET_WLAN}
1298 * network[2] == GNUNET_ATS_NET_LAN
1299 * out_quota[2] == 65353
1300 * in_quota[2] == 65353
1302 * @param cfg configuration handle
1303 * @param stats the GNUNET_STATISTICS handle
1304 * @param network array of GNUNET_ATS_NetworkType with length dest_length
1305 * @param out_quota array of outbound quotas
1306 * @param in_quota array of outbound quota
1307 * @param dest_length array length for quota arrays
1308 * @param bw_changed_cb callback for changed bandwidth amounts
1309 * @param bw_changed_cb_cls cls for callback
1310 * @param get_preference callback to get relative preferences for a peer
1311 * @param get_preference_cls cls for callback to get relative preferences
1312 * @return handle for the solver on success, NULL on fail
1315 GAS_proportional_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
1316 const struct GNUNET_STATISTICS_Handle *stats,
1318 unsigned long long *out_quota,
1319 unsigned long long *in_quota,
1321 GAS_bandwidth_changed_cb bw_changed_cb,
1322 void *bw_changed_cb_cls,
1323 GAS_get_preferences get_preference,
1324 void *get_preference_cls)
1327 struct GAS_PROPORTIONAL_Handle *s = GNUNET_malloc (sizeof (struct GAS_PROPORTIONAL_Handle));
1328 struct Network * cur;
1329 char * net_str[GNUNET_ATS_NetworkTypeCount] = GNUNET_ATS_NetworkTypeString;
1332 s->stats = (struct GNUNET_STATISTICS_Handle *) stats;
1333 s->bw_changed = bw_changed_cb;
1334 s->bw_changed_cls = bw_changed_cb_cls;
1335 s->get_preferences = get_preference;
1336 s->get_preferences_cls = get_preference_cls;
1337 s->networks = dest_length;
1338 s->network_entries = GNUNET_malloc (dest_length * sizeof (struct Network));
1339 s->active_addresses = 0;
1340 s->total_addresses = 0;
1341 s->bulk_lock = GNUNET_NO;
1343 for (c = 0; c < dest_length; c++)
1345 cur = &s->network_entries[c];
1346 cur->total_addresses = 0;
1347 cur->active_addresses = 0;
1348 cur->type = network[c];
1349 cur->total_quota_in = in_quota[c];
1350 cur->total_quota_out = out_quota[c];
1351 cur->desc = net_str[c];
1352 GNUNET_asprintf (&cur->stat_total, "# ATS addresses %s total", cur->desc);
1353 GNUNET_asprintf (&cur->stat_active, "# ATS active addresses %s total", cur->desc);
1360 * Shutdown the proportional problem solver
1362 * @param solver the respective handle to shutdown
1365 GAS_proportional_done (void *solver)
1367 struct GAS_PROPORTIONAL_Handle *s = solver;
1368 struct AddressWrapper *cur;
1369 struct AddressWrapper *next;
1371 GNUNET_assert (s != NULL);
1373 for (c = 0; c < s->networks; c++)
1375 if (s->network_entries[c].total_addresses > 0)
1377 LOG (GNUNET_ERROR_TYPE_ERROR,
1378 "Had %u addresses for network `%s' not deleted during shutdown\n",
1379 s->network_entries[c].total_addresses,
1380 s->network_entries[c].desc);
1384 if (s->network_entries[c].active_addresses > 0)
1386 LOG (GNUNET_ERROR_TYPE_ERROR,
1387 "Had %u active addresses for network `%s' not deleted during shutdown\n",
1388 s->network_entries[c].active_addresses,
1389 s->network_entries[c].desc);
1393 next = s->network_entries[c].head;
1394 while (NULL != (cur = next))
1397 GNUNET_CONTAINER_DLL_remove (s->network_entries[c].head,
1398 s->network_entries[c].tail,
1402 GNUNET_free (s->network_entries[c].stat_total);
1403 GNUNET_free (s->network_entries[c].stat_active);
1405 if (s->total_addresses > 0)
1407 LOG (GNUNET_ERROR_TYPE_ERROR,
1408 "Had %u addresses not deleted during shutdown\n",
1409 s->total_addresses);
1412 if (s->active_addresses > 0)
1414 LOG (GNUNET_ERROR_TYPE_ERROR,
1415 "Had %u active addresses not deleted during shutdown\n",
1416 s->active_addresses);
1419 GNUNET_free (s->network_entries);
1424 /* end of gnunet-service-ats-solver_proportional.c */