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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 * Hashmap containing all valid addresses
229 const struct GNUNET_CONTAINER_MultiHashMap *addresses;
232 * Bandwidth changed callback
234 GAS_bandwidth_changed_cb bw_changed;
237 * Bandwidth changed callback cls
239 void *bw_changed_cls;
242 * ATS function to get preferences
244 GAS_get_preferences get_preferences;
247 * Closure for ATS function to get preferences
249 void *get_preferences_cls;
252 * ATS function to get properties
254 GAS_get_properties get_properties;
257 * Closure for ATS function to get properties
259 void *get_properties_cls;
267 * Number of changes while solver was locked
273 * Total number of addresses for solver
275 unsigned int total_addresses;
278 * Number of active addresses for solver
280 unsigned int active_addresses;
285 struct Network *network_entries;
290 unsigned int networks;
296 * Representation of a network
306 * Network description
311 * Total inbound quota
314 unsigned long long total_quota_in;
317 * Total outbound quota
320 unsigned long long total_quota_out;
323 * Number of active addresses for this network
325 unsigned int active_addresses;
328 * Number of total addresses for this network
330 unsigned int total_addresses;
333 * String for statistics total addresses
338 * String for statistics active addresses
342 struct AddressWrapper *head;
343 struct AddressWrapper *tail;
348 * Wrapper for addresses to store them in network's linked list
350 struct AddressWrapper
355 struct AddressWrapper *next;
360 struct AddressWrapper *prev;
365 struct ATS_Address *addr;
371 * Important solver functions
372 * ---------------------------
376 * Test if bandwidth is available in this network to add an additional address
378 * @param net the network type to update
379 * @return GNUNET_YES or GNUNET_NO
382 is_bandwidth_available_in_network (struct Network *net)
384 GNUNET_assert (NULL != net);
385 unsigned int na = net->active_addresses + 1;
386 uint32_t min_bw = ntohl (GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT.value__);
387 if (((net->total_quota_in / na) > min_bw) &&
388 ((net->total_quota_out / na) > min_bw))
390 LOG (GNUNET_ERROR_TYPE_DEBUG,
391 "Enough bandwidth available for %u active addresses in network `%s'\n",
397 LOG (GNUNET_ERROR_TYPE_DEBUG,
398 "Not enough bandwidth available for %u active addresses in network `%s'\n",
406 * Update bandwidth assigned to peers in this network
408 * @param s the solver handle
409 * @param net the network type to update
410 * @param address_except address excluded from notification, since we suggest
414 distribute_bandwidth_in_network (struct GAS_PROPORTIONAL_Handle *s,
416 struct ATS_Address *address_except)
418 unsigned long long remaining_quota_in = 0;
419 unsigned long long quota_out_used = 0;
421 unsigned long long remaining_quota_out = 0;
422 unsigned long long quota_in_used = 0;
423 uint32_t min_bw = ntohl (GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT.value__);
425 double total_prefs; /* Important: has to be double not float due to precision */
426 double cur_pref; /* Important: has to be double not float due to precision */
427 const double *t = NULL; /* Important: has to be double not float due to precision */
430 unsigned long long assigned_quota_in = 0;
431 unsigned long long assigned_quota_out = 0;
432 struct AddressWrapper *cur;
435 if (GNUNET_YES == s->bulk_lock)
441 LOG (GNUNET_ERROR_TYPE_DEBUG,
442 "Recalculate quota for network type `%s' for %u addresses (in/out): %llu/%llu \n",
443 net->desc, net->active_addresses, net->total_quota_in, net->total_quota_in);
445 if (net->active_addresses == 0)
446 return; /* no addresses to update */
449 * Assign every peer in network minimum Bandwidth
450 * Distribute bandwidth left according to preference
453 if ((net->active_addresses * min_bw) > net->total_quota_in)
458 if ((net->active_addresses * min_bw) > net->total_quota_out)
464 remaining_quota_in = net->total_quota_in - (net->active_addresses * min_bw);
465 remaining_quota_out = net->total_quota_out - (net->active_addresses * min_bw);
466 LOG (GNUNET_ERROR_TYPE_DEBUG, "Remaining bandwidth : (in/out): %llu/%llu \n",
467 remaining_quota_in, remaining_quota_out);
469 for (cur = net->head; NULL != cur; cur = cur->next)
471 if (GNUNET_YES == cur->addr->active)
473 GNUNET_assert (NULL != (t = s->get_preferences (s->get_preferences_cls, &cur->addr->peer)));
476 for (c = 0; c < GNUNET_ATS_PreferenceCount; c++)
478 if (c != GNUNET_ATS_PREFERENCE_END)
480 //fprintf (stderr, "VALUE[%u] %s %.3f \n", c, GNUNET_i2s (&cur->addr->peer), t[c]);
484 total_prefs += (peer_prefs / (GNUNET_ATS_PreferenceCount -1));
487 for (cur = net->head; NULL != cur; cur = cur->next)
489 if (GNUNET_YES == cur->addr->active)
492 GNUNET_assert (NULL != (t = s->get_preferences (s->get_preferences_cls, &cur->addr->peer)));
494 for (c = 0; c < GNUNET_ATS_PreferenceCount; c++)
496 if (c != GNUNET_ATS_PREFERENCE_END)
501 assigned_quota_in = min_bw + ((cur_pref / total_prefs) * remaining_quota_in);
502 assigned_quota_out = min_bw + ((cur_pref / total_prefs) * remaining_quota_out);
504 LOG (GNUNET_ERROR_TYPE_DEBUG,
505 "New quota for peer `%s' with preference (cur/total) %.3f/%.3f (in/out): %llu / %llu\n",
506 GNUNET_i2s (&cur->addr->peer),
507 cur_pref, total_prefs,
508 assigned_quota_in, assigned_quota_out);
512 assigned_quota_in = 0;
513 assigned_quota_out = 0;
516 quota_in_used += assigned_quota_in;
517 quota_out_used += assigned_quota_out;
518 /* Prevent overflow due to rounding errors */
519 if (assigned_quota_in > UINT32_MAX)
520 assigned_quota_in = UINT32_MAX;
521 if (assigned_quota_out > UINT32_MAX)
522 assigned_quota_out = UINT32_MAX;
524 /* Compare to current bandwidth assigned */
525 if ((assigned_quota_in != ntohl(cur->addr->assigned_bw_in.value__)) ||
526 (assigned_quota_out != ntohl(cur->addr->assigned_bw_out.value__)))
528 cur->addr->assigned_bw_in.value__ = htonl (assigned_quota_in);
529 cur->addr->assigned_bw_out.value__ = htonl (assigned_quota_out);
530 /* Notify on change */
531 if ((GNUNET_YES == cur->addr->active) && (cur->addr != address_except))
532 s->bw_changed (s->bw_changed_cls, cur->addr);
536 LOG (GNUNET_ERROR_TYPE_DEBUG,
537 "Total bandwidth assigned is (in/out): %llu /%llu\n",
540 if (quota_out_used > net->total_quota_out + 1) /* +1 is required due to rounding errors */
542 LOG (GNUNET_ERROR_TYPE_ERROR,
543 "Total outbound bandwidth assigned is larger than allowed (used/allowed) for %u active addresses: %llu / %llu\n",
544 net->active_addresses,
546 net->total_quota_out);
548 if (quota_in_used > net->total_quota_in + 1) /* +1 is required due to rounding errors */
550 LOG (GNUNET_ERROR_TYPE_ERROR,
551 "Total inbound bandwidth assigned is larger than allowed (used/allowed) for %u active addresses: %llu / %llu\n",
552 net->active_addresses,
554 net->total_quota_in);
560 * Extract an ATS performance info from an address
562 * @param address the address
563 * @param type the type to extract in HBO
564 * @return the value in HBO or GNUNET_ATS_VALUE_UNDEFINED in HBO if value does not exist
567 get_performance_info (struct ATS_Address *address, uint32_t type);
571 struct FindBestAddressCtx
573 struct GAS_PROPORTIONAL_Handle *s;
574 struct ATS_Address *best;
579 * Find a "good" address to use for a peer by iterating over the addresses for this peer.
580 * If we already have an existing address, we stick to it.
581 * Otherwise, we pick by lowest distance and then by lowest latency.
583 * @param cls the 'struct ATS_Address**' where we store the result
585 * @param value another 'struct ATS_Address*' to consider using
586 * @return GNUNET_OK (continue to iterate)
589 find_best_address_it (void *cls, const struct GNUNET_HashCode * key, void *value)
591 struct FindBestAddressCtx *fba_ctx = (struct FindBestAddressCtx *) cls;
592 struct ATS_Address *current = (struct ATS_Address *) value;
593 struct GNUNET_TIME_Absolute now;
594 struct Network *net = (struct Network *) current->solver_information;
595 const double *norm_prop_cur;
596 const double *norm_prop_prev;
598 now = GNUNET_TIME_absolute_get();
600 if (current->blocked_until.abs_value == GNUNET_TIME_absolute_max (now, current->blocked_until).abs_value)
602 /* This address is blocked for suggestion */
603 LOG (GNUNET_ERROR_TYPE_DEBUG,
604 "Address %p blocked for suggestion for %llu ms \n",
606 GNUNET_TIME_absolute_get_difference(now, current->blocked_until).rel_value);
609 if (GNUNET_NO == is_bandwidth_available_in_network (net))
610 return GNUNET_OK; /* There's no bandwidth available in this network */
611 if (NULL != fba_ctx->best)
613 GNUNET_assert (NULL != fba_ctx->best->plugin);
614 GNUNET_assert (NULL != current->plugin);
615 if (0 == strcmp (fba_ctx->best->plugin, current->plugin))
617 if ((0 != fba_ctx->best->addr_len) &&
618 (0 == current->addr_len))
620 /* saved address was an outbound address, but we have an inbound address */
621 fba_ctx->best = current;
624 if (0 == fba_ctx->best->addr_len)
626 /* saved address was an inbound address, so do not overwrite */
631 if (NULL == fba_ctx->best)
633 fba_ctx->best = current;
636 if ((ntohl (fba_ctx->best->assigned_bw_in.value__) == 0) &&
637 (ntohl (current->assigned_bw_in.value__) > 0))
639 /* stick to existing connection */
640 fba_ctx->best = current;
644 norm_prop_cur = fba_ctx->s->get_properties (fba_ctx->s->get_properties_cls,
645 (const struct ATS_Address *) current);
647 norm_prop_prev = fba_ctx->s->get_properties (fba_ctx->s->get_properties_cls,
648 (const struct ATS_Address *) fba_ctx->best);
650 if (norm_prop_cur[1] < norm_prop_prev[1])
652 /* user shorter distance */
653 fba_ctx->best = current;
656 if (norm_prop_cur[0] < norm_prop_prev[0])
658 /* user shorter distance */
659 fba_ctx->best = current;
669 * ---------------------------
673 * Update bandwidth assignment for all networks
675 * @param s the solver handle
678 distribute_bandwidth_in_all_networks (struct GAS_PROPORTIONAL_Handle *s)
682 for (i = 0; i < s->networks; i++)
683 distribute_bandwidth_in_network (s, &s->network_entries[i], NULL);
689 * Lookup network struct by type
691 * @param s the solver handle
692 * @param type the network type
693 * @return the network struct
695 static struct Network *
696 get_network (struct GAS_PROPORTIONAL_Handle *s, uint32_t type)
699 for (c = 0 ; c < s->networks; c++)
701 if (s->network_entries[c].type == type)
702 return &s->network_entries[c];
710 * Hashmap Iterator to find current active address for peer
712 * @param cls last active address
713 * @param key peer's key
714 * @param value address to check
715 * @return GNUNET_NO on double active address else GNUNET_YES
718 get_active_address_it (void *cls, const struct GNUNET_HashCode * key, void *value)
720 struct ATS_Address * dest = (struct ATS_Address *) (*(struct ATS_Address **)cls);
721 struct ATS_Address * aa = (struct ATS_Address *) value;
723 if (GNUNET_YES == aa->active)
727 /* should never happen */
728 LOG (GNUNET_ERROR_TYPE_ERROR, "Multiple active addresses for peer `%s'\n", GNUNET_i2s (&aa->peer));
739 * Find current active address for peer
741 * @param solver the solver handle
742 * @param addresses the address set
743 * @param peer the peer
744 * @return active address or NULL
746 static struct ATS_Address *
747 get_active_address (void *solver,
748 struct GNUNET_CONTAINER_MultiHashMap * addresses,
749 const struct GNUNET_PeerIdentity *peer)
751 struct ATS_Address * dest = NULL;
753 GNUNET_CONTAINER_multihashmap_get_multiple(addresses,
755 &get_active_address_it, &dest);
762 addresse_increment (struct GAS_PROPORTIONAL_Handle *s,
767 if (GNUNET_YES == total)
769 s->total_addresses ++;
770 net->total_addresses ++;
771 GNUNET_STATISTICS_update (s->stats, "# ATS addresses total", 1, GNUNET_NO);
772 GNUNET_STATISTICS_update (s->stats, net->stat_total, 1, GNUNET_NO);
774 if (GNUNET_YES == active)
776 net->active_addresses ++;
777 s->active_addresses ++;
778 GNUNET_STATISTICS_update (s->stats, "# ATS active addresses total", 1, GNUNET_NO);
779 GNUNET_STATISTICS_update (s->stats, net->stat_active, 1, GNUNET_NO);
786 addresse_decrement (struct GAS_PROPORTIONAL_Handle *s,
792 if (GNUNET_YES == total)
794 if (s->total_addresses < 1)
801 s->total_addresses --;
802 GNUNET_STATISTICS_update (s->stats, "# ATS addresses total", -1, GNUNET_NO);
804 if (net->total_addresses < 1)
811 net->total_addresses --;
812 GNUNET_STATISTICS_update (s->stats, net->stat_total, -1, GNUNET_NO);
816 if (GNUNET_YES == active)
818 if (net->active_addresses < 1)
825 net->active_addresses --;
826 GNUNET_STATISTICS_update (s->stats, net->stat_active, -1, GNUNET_NO);
828 if (s->active_addresses < 1)
835 s->active_addresses --;
836 GNUNET_STATISTICS_update (s->stats, "# ATS addresses total", -1, GNUNET_NO);
844 * Extract an ATS performance info from an address
846 * @param address the address
847 * @param type the type to extract in HBO
848 * @return the value in HBO or GNUNET_ATS_VALUE_UNDEFINED in HBO if value does not exist
851 get_performance_info (struct ATS_Address *address, uint32_t type)
854 GNUNET_assert (NULL != address);
856 if ((NULL == address->atsi) || (0 == address->atsi_count))
857 return GNUNET_ATS_VALUE_UNDEFINED;
859 for (c1 = 0; c1 < address->atsi_count; c1++)
861 if (ntohl(address->atsi[c1].type) == type)
862 return ntohl(address->atsi[c1].value);
864 return GNUNET_ATS_VALUE_UNDEFINED;
869 * Solver API functions
870 * ---------------------------
874 * Changes the preferences for a peer in the problem
876 * @param solver the solver handle
877 * @param peer the peer to change the preference for
878 * @param kind the kind to change the preference
879 * @param pref_rel the normalized preference value for this kind over all clients
882 GAS_proportional_address_change_preference (void *solver,
883 const struct GNUNET_PeerIdentity *peer,
884 enum GNUNET_ATS_PreferenceKind kind,
887 struct GAS_PROPORTIONAL_Handle *s = solver;
888 GNUNET_assert (NULL != solver);
889 GNUNET_assert (NULL != peer);
891 distribute_bandwidth_in_all_networks (s);
896 * Get the preferred address for a specific peer
898 * @param solver the solver handle
899 * @param addresses the address hashmap containing all addresses
900 * @param peer the identity of the peer
902 const struct ATS_Address *
903 GAS_proportional_get_preferred_address (void *solver,
904 const struct GNUNET_PeerIdentity *peer)
906 struct GAS_PROPORTIONAL_Handle *s = solver;
907 struct Network *net_prev;
908 struct Network *net_cur;
909 struct ATS_Address *prev;
910 struct FindBestAddressCtx fba_ctx;
912 GNUNET_assert (s != NULL);
913 GNUNET_assert (peer != NULL);
915 /* Get address with: stick to current address, lower distance, lower latency */
919 GNUNET_CONTAINER_multihashmap_get_multiple (s->addresses, &peer->hashPubKey,
920 &find_best_address_it, &fba_ctx);
921 if (NULL == fba_ctx.best)
923 LOG (GNUNET_ERROR_TYPE_DEBUG, "Cannot suggest address for peer `%s'\n", GNUNET_i2s (peer));
927 LOG (GNUNET_ERROR_TYPE_DEBUG, "Suggesting %s address %p for peer `%s'\n",
928 (GNUNET_NO == fba_ctx.best->active) ? "inactive" : "active",
929 fba_ctx.best, GNUNET_i2s (peer));
930 net_cur = (struct Network *) fba_ctx.best->solver_information;
931 if (NULL == fba_ctx.best)
933 LOG (GNUNET_ERROR_TYPE_ERROR, "Trying to suggesting unknown address peer `%s'\n",
938 if (GNUNET_YES == fba_ctx.best->active)
940 /* This address was selected previously, so no need to update quotas */
944 /* This address was not active, so we have to:
946 * - mark previous active address as not active
947 * - update quota for previous address network
948 * - update quota for this address network
951 prev = get_active_address (s, (struct GNUNET_CONTAINER_MultiHashMap *) s->addresses, peer);
954 net_prev = (struct Network *) prev->solver_information;
955 prev->active = GNUNET_NO; /* No active any longer */
956 prev->assigned_bw_in = GNUNET_BANDWIDTH_value_init (0); /* no bw assigned */
957 prev->assigned_bw_out = GNUNET_BANDWIDTH_value_init (0); /* no bw assigned */
958 s->bw_changed (s->bw_changed_cls, prev); /* notify about bw change, REQUIRED? */
959 if (GNUNET_SYSERR == addresse_decrement (s, net_prev, GNUNET_NO, GNUNET_YES))
961 distribute_bandwidth_in_network (s, net_prev, NULL);
964 if (GNUNET_NO == (is_bandwidth_available_in_network (fba_ctx.best->solver_information)))
966 GNUNET_break (0); /* This should never happen*/
970 fba_ctx.best->active = GNUNET_YES;
971 addresse_increment(s, net_cur, GNUNET_NO, GNUNET_YES);
972 distribute_bandwidth_in_network (s, net_cur, fba_ctx.best);
978 * Stop notifying about address and bandwidth changes for this peer
980 * @param solver the solver handle
981 * @param addresses address hashmap
982 * @param peer the peer
985 GAS_proportional_stop_get_preferred_address (void *solver,
986 const struct GNUNET_PeerIdentity *peer)
993 * Remove an address from the solver
995 * @param solver the solver handle
996 * @param addresses the address hashmap containing all addresses
997 * @param address the address to remove
998 * @param session_only delete only session not whole address
1001 GAS_proportional_address_delete (void *solver,
1002 struct ATS_Address *address,
1005 struct GAS_PROPORTIONAL_Handle *s = solver;
1006 struct Network *net;
1007 struct AddressWrapper *aw;
1009 /* Remove an adress completely, we have to:
1010 * - Remove from specific network
1011 * - Decrease number of total addresses
1013 * - decrease number of active addreses
1017 net = (struct Network *) address->solver_information;
1019 if (GNUNET_NO == session_only)
1021 LOG (GNUNET_ERROR_TYPE_DEBUG, "Deleting %s address %p for peer `%s' from network `%s' (total: %u/ active: %u)\n",
1022 (GNUNET_NO == address->active) ? "inactive" : "active",
1023 address, GNUNET_i2s (&address->peer),
1024 net->desc, net->total_addresses, net->active_addresses);
1026 /* Remove address */
1027 addresse_decrement (s, net, GNUNET_YES, GNUNET_NO);
1028 for (aw = net->head; NULL != aw; aw = aw->next)
1030 if (aw->addr == address)
1038 GNUNET_CONTAINER_DLL_remove (net->head, net->tail, aw);
1043 /* Remove session only: remove if active and update */
1044 LOG (GNUNET_ERROR_TYPE_DEBUG, "Deleting %s session %p for peer `%s' from network `%s' (total: %u/ active: %u)\n",
1045 (GNUNET_NO == address->active) ? "inactive" : "active",
1046 address, GNUNET_i2s (&address->peer),
1047 net->desc, net->total_addresses, net->active_addresses);
1050 if (GNUNET_YES == address->active)
1052 /* Address was active, remove from network and update quotas*/
1053 address->active = GNUNET_NO;
1054 if (GNUNET_SYSERR == addresse_decrement (s, net, GNUNET_NO, GNUNET_YES))
1056 distribute_bandwidth_in_network (s, net, NULL);
1058 LOG (GNUNET_ERROR_TYPE_DEBUG, "After deleting address now total %u and active %u addresses in network `%s'\n",
1059 net->total_addresses,
1060 net->active_addresses,
1067 * Start a bulk operation
1069 * @param solver the solver
1072 GAS_proportional_bulk_start (void *solver)
1074 LOG (GNUNET_ERROR_TYPE_DEBUG, "Locking solver for bulk operation ...\n");
1075 struct GAS_PROPORTIONAL_Handle *s = (struct GAS_PROPORTIONAL_Handle *) solver;
1077 GNUNET_assert (NULL != solver);
1082 * Bulk operation done
1085 GAS_proportional_bulk_stop (void *solver)
1087 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unlocking solver from bulk operation ...\n");
1089 struct GAS_PROPORTIONAL_Handle *s = (struct GAS_PROPORTIONAL_Handle *) solver;
1090 GNUNET_assert (NULL != solver);
1092 if (s->bulk_lock < 1)
1098 if ((0 == s->bulk_lock) && (0 < s->bulk_requests))
1100 LOG (GNUNET_ERROR_TYPE_ERROR, "No lock pending, recalculating\n");
1101 distribute_bandwidth_in_all_networks (s);
1102 s->bulk_requests = 0;
1108 * Add a new single address to a network
1110 * @param solver the solver Handle
1111 * @param address the address to add
1112 * @param network network type of this address
1115 GAS_proportional_address_add (void *solver,
1116 struct ATS_Address *address,
1120 * Updates a single address in the solver and checks previous values
1122 * @param solver the solver Handle
1123 * @param addresses the address hashmap containing all addresses
1124 * @param address the update address
1125 * @param session the previous session
1126 * @param in_use the previous address in use state
1127 * @param prev_ats previous ATS information
1128 * @param prev_atsi_count the previous atsi count
1131 GAS_proportional_address_update (void *solver,
1132 struct ATS_Address *address,
1135 const struct GNUNET_ATS_Information *prev_ats,
1136 uint32_t prev_atsi_count)
1138 struct ATS_Address *new;
1139 struct GAS_PROPORTIONAL_Handle *s = (struct GAS_PROPORTIONAL_Handle *) solver;
1141 uint32_t prev_value;
1144 int save_active = GNUNET_NO;
1145 struct Network *new_net = NULL;
1147 /* Check updates to performance information */
1148 for (i = 0; i < prev_atsi_count; i++)
1150 prev_type = ntohl (prev_ats[i].type);
1151 prev_value = ntohl (prev_ats[i].value);
1154 case GNUNET_ATS_UTILIZATION_UP:
1155 case GNUNET_ATS_UTILIZATION_DOWN:
1156 case GNUNET_ATS_QUALITY_NET_DELAY:
1157 case GNUNET_ATS_QUALITY_NET_DISTANCE:
1158 case GNUNET_ATS_COST_WAN:
1159 case GNUNET_ATS_COST_LAN:
1160 case GNUNET_ATS_COST_WLAN:
1161 /* No actions required here*/
1163 case GNUNET_ATS_NETWORK_TYPE:
1165 addr_net = get_performance_info (address, GNUNET_ATS_NETWORK_TYPE);
1166 if (GNUNET_ATS_VALUE_UNDEFINED == addr_net)
1169 addr_net = GNUNET_ATS_NET_UNSPECIFIED;
1171 if (addr_net != prev_value)
1173 /* Network changed */
1174 LOG (GNUNET_ERROR_TYPE_DEBUG, "Network type changed, moving %s address from `%s' to `%s'\n",
1175 (GNUNET_YES == address->active) ? "active" : "inactive",
1176 GNUNET_ATS_print_network_type(prev_value),
1177 GNUNET_ATS_print_network_type(addr_net));
1179 save_active = address->active;
1180 /* remove from old network */
1181 GAS_proportional_address_delete (solver, address, GNUNET_NO);
1183 /* set new network type */
1184 new_net = get_network (solver, addr_net);
1185 if (NULL == new_net)
1187 /* Address changed to invalid network... */
1188 LOG (GNUNET_ERROR_TYPE_ERROR, _("Cannot find network of type `%u' %s\n"),
1189 addr_net, GNUNET_ATS_print_network_type (addr_net));
1190 address->assigned_bw_in = GNUNET_BANDWIDTH_value_init (0);
1191 address->assigned_bw_out = GNUNET_BANDWIDTH_value_init (0);
1192 s->bw_changed (s->bw_changed_cls, address);
1195 address->solver_information = new_net;
1197 /* Add to new network and update*/
1198 GAS_proportional_address_add (solver, address, addr_net);
1199 if (GNUNET_YES == save_active)
1201 /* check if bandwidth available in new network */
1202 if (GNUNET_YES == (is_bandwidth_available_in_network (new_net)))
1204 /* Suggest updated address */
1205 address->active = GNUNET_YES;
1206 addresse_increment (s, new_net, GNUNET_NO, GNUNET_YES);
1207 distribute_bandwidth_in_network (solver, new_net, NULL);
1211 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not enough bandwidth in new network, suggesting alternative address ..\n");
1213 /* Set old address to zero bw */
1214 address->assigned_bw_in = GNUNET_BANDWIDTH_value_init (0);
1215 address->assigned_bw_out = GNUNET_BANDWIDTH_value_init (0);
1216 s->bw_changed (s->bw_changed_cls, address);
1218 /* Find new address to suggest since no bandwidth in network*/
1219 new = (struct ATS_Address *) GAS_proportional_get_preferred_address (s, &address->peer);
1222 /* Have an alternative address to suggest */
1223 s->bw_changed (s->bw_changed_cls, new);
1231 case GNUNET_ATS_ARRAY_TERMINATOR:
1234 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1235 "Received unsupported ATS type %u\n", prev_type);
1242 if (address->session_id != session)
1244 LOG (GNUNET_ERROR_TYPE_DEBUG,
1245 "Session changed from %u to %u\n", session, address->session_id);
1247 if (address->used != in_use)
1249 LOG (GNUNET_ERROR_TYPE_DEBUG,
1250 "Usage changed from %u to %u\n", in_use, address->used);
1257 * Add a new single address to a network
1259 * @param solver the solver Handle
1260 * @param addresses the address hashmap containing all addresses
1261 * @param address the address to add
1262 * @param network network type of this address
1265 GAS_proportional_address_add (void *solver,
1266 struct ATS_Address *address,
1269 struct GAS_PROPORTIONAL_Handle *s = solver;
1270 struct Network *net = NULL;
1271 struct AddressWrapper *aw = NULL;
1272 GNUNET_assert (NULL != s);
1274 net = get_network (s, network);
1281 aw = GNUNET_malloc (sizeof (struct AddressWrapper));
1283 GNUNET_CONTAINER_DLL_insert (net->head, net->tail, aw);
1284 addresse_increment (s, net, GNUNET_YES, GNUNET_NO);
1285 aw->addr->solver_information = net;
1287 LOG (GNUNET_ERROR_TYPE_DEBUG, "After adding address now total %u and active %u addresses in network `%s'\n",
1288 net->total_addresses,
1289 net->active_addresses,
1295 * Init the proportional problem solver
1298 * network[i] contains the network type as type GNUNET_ATS_NetworkType[i]
1299 * out_quota[i] contains outbound quota for network type i
1300 * in_quota[i] contains inbound quota for network type i
1303 * network = {GNUNET_ATS_NET_UNSPECIFIED, GNUNET_ATS_NET_LOOPBACK, GNUNET_ATS_NET_LAN, GNUNET_ATS_NET_WAN, GNUNET_ATS_NET_WLAN}
1304 * network[2] == GNUNET_ATS_NET_LAN
1305 * out_quota[2] == 65353
1306 * in_quota[2] == 65353
1308 * @param cfg configuration handle
1309 * @param stats the GNUNET_STATISTICS handle
1310 * @param addresses hashmap containing all addresses
1311 * @param network array of GNUNET_ATS_NetworkType with length dest_length
1312 * @param out_quota array of outbound quotas
1313 * @param in_quota array of outbound quota
1314 * @param dest_length array length for quota arrays
1315 * @param bw_changed_cb callback for changed bandwidth amounts
1316 * @param bw_changed_cb_cls cls for callback
1317 * @param get_preference callback to get relative preferences for a peer
1318 * @param get_preference_cls cls for callback to get relative preferences
1319 * @return handle for the solver on success, NULL on fail
1322 GAS_proportional_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
1323 const struct GNUNET_STATISTICS_Handle *stats,
1324 const struct GNUNET_CONTAINER_MultiHashMap *addresses,
1326 unsigned long long *out_quota,
1327 unsigned long long *in_quota,
1329 GAS_bandwidth_changed_cb bw_changed_cb,
1330 void *bw_changed_cb_cls,
1331 GAS_get_preferences get_preference,
1332 void *get_preference_cls,
1333 GAS_get_properties get_properties,
1334 void *get_properties_cls)
1337 struct GAS_PROPORTIONAL_Handle *s = GNUNET_malloc (sizeof (struct GAS_PROPORTIONAL_Handle));
1338 struct Network * cur;
1339 char * net_str[GNUNET_ATS_NetworkTypeCount] = GNUNET_ATS_NetworkTypeString;
1341 GNUNET_assert (NULL != cfg);
1342 GNUNET_assert (NULL != stats);
1343 GNUNET_assert (NULL != network);
1344 GNUNET_assert (NULL != bw_changed_cb);
1345 GNUNET_assert (NULL != get_preference);
1346 GNUNET_assert (NULL != get_properties);
1348 s->stats = (struct GNUNET_STATISTICS_Handle *) stats;
1349 s->bw_changed = bw_changed_cb;
1350 s->bw_changed_cls = bw_changed_cb_cls;
1351 s->get_preferences = get_preference;
1352 s->get_preferences_cls = get_preference_cls;
1353 s->get_properties = get_properties;
1354 s->get_properties_cls = get_properties_cls;
1355 s->networks = dest_length;
1356 s->network_entries = GNUNET_malloc (dest_length * sizeof (struct Network));
1357 s->active_addresses = 0;
1358 s->total_addresses = 0;
1359 s->bulk_lock = GNUNET_NO;
1360 s->addresses = addresses;
1362 for (c = 0; c < dest_length; c++)
1364 cur = &s->network_entries[c];
1365 cur->total_addresses = 0;
1366 cur->active_addresses = 0;
1367 cur->type = network[c];
1368 cur->total_quota_in = in_quota[c];
1369 cur->total_quota_out = out_quota[c];
1370 cur->desc = net_str[c];
1371 GNUNET_asprintf (&cur->stat_total, "# ATS addresses %s total", cur->desc);
1372 GNUNET_asprintf (&cur->stat_active, "# ATS active addresses %s total", cur->desc);
1379 * Shutdown the proportional problem solver
1381 * @param solver the respective handle to shutdown
1384 GAS_proportional_done (void *solver)
1386 struct GAS_PROPORTIONAL_Handle *s = solver;
1387 struct AddressWrapper *cur;
1388 struct AddressWrapper *next;
1390 GNUNET_assert (s != NULL);
1392 for (c = 0; c < s->networks; c++)
1394 if (s->network_entries[c].total_addresses > 0)
1396 LOG (GNUNET_ERROR_TYPE_ERROR,
1397 "Had %u addresses for network `%s' not deleted during shutdown\n",
1398 s->network_entries[c].total_addresses,
1399 s->network_entries[c].desc);
1403 if (s->network_entries[c].active_addresses > 0)
1405 LOG (GNUNET_ERROR_TYPE_ERROR,
1406 "Had %u active addresses for network `%s' not deleted during shutdown\n",
1407 s->network_entries[c].active_addresses,
1408 s->network_entries[c].desc);
1412 next = s->network_entries[c].head;
1413 while (NULL != (cur = next))
1416 GNUNET_CONTAINER_DLL_remove (s->network_entries[c].head,
1417 s->network_entries[c].tail,
1421 GNUNET_free (s->network_entries[c].stat_total);
1422 GNUNET_free (s->network_entries[c].stat_active);
1424 if (s->total_addresses > 0)
1426 LOG (GNUNET_ERROR_TYPE_ERROR,
1427 "Had %u addresses not deleted during shutdown\n",
1428 s->total_addresses);
1431 if (s->active_addresses > 0)
1433 LOG (GNUNET_ERROR_TYPE_ERROR,
1434 "Had %u active addresses not deleted during shutdown\n",
1435 s->active_addresses);
1438 GNUNET_free (s->network_entries);
1443 /* end of gnunet-service-ats-solver_proportional.c */