Imported Upstream version 0.9.5a

1 files changed, 1377 insertions, 0 deletions

diff --git a/src/ats/gnunet-service-ats_addresses_simplistic.c b/src/ats/gnunet-service-ats_addresses_simplistic.c
new file mode 100644
index 0000000..74a4b43
--- /dev/null
+++ b/src/ats/gnunet-service-ats_addresses_simplistic.c
@@ -0,0 +1,1377 @@
+/*
+     This file is part of GNUnet.
+     (C) 2011 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file ats/gnunet-service-ats_addresses_simplistic.h
+ * @brief ats simplistic ressource assignment
+ * @author Matthias Wachs
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet-service-ats_addresses.h"
+#include "gnunet_statistics_service.h"
+
+#define LOG(kind,...) GNUNET_log_from (kind, "ats-simplistic",__VA_ARGS__)
+
+/**
+ * ATS simplistic solver
+ *
+ * Assigns in and outbound bandwidth equally for all addresses in specific
+ * network type (WAN, LAN) based on configured in and outbound quota for this
+ * network.
+ *
+ * For each peer only a single is selected and marked as "active" in the address
+ * struct.
+ *
+ * E.g.:
+ *
+ * You have the networks WAN and LAN and quotas
+ * WAN_TOTAL_IN, WAN_TOTAL_OUT
+ * LAN_TOTAL_IN, LAN_TOTAL_OUT
+ *
+ * If you have x addresses in the network segment LAN, the quotas are
+ * QUOTA_PER_ADDRESS = LAN_TOTAL_OUT / x
+ *
+ * Quotas are automatically recalculated and reported back when addresses are
+ * - requested
+ *
+ */
+
+#define PREF_AGING_INTERVAL GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
+#define PREF_AGING_FACTOR 0.95
+
+#define DEFAULT_PREFERENCE 1.0
+#define MIN_UPDATE_INTERVAL GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
+
+/**
+ * A handle for the simplistic solver
+ */
+struct GAS_SIMPLISTIC_Handle
+{
+  /**
+   * Statistics handle
+   */
+
+  struct GNUNET_STATISTICS_Handle *stats;
+
+  /**
+   * Total number of addresses for solver
+   */
+  unsigned int total_addresses;
+
+  /**
+   * Number of active addresses for solver
+   */
+  unsigned int active_addresses;
+
+  /**
+   * Networks array
+   */
+  struct Network *network_entries;
+
+  /**
+   * Number of networks
+   */
+  unsigned int networks;
+
+  /**
+   * Callback
+   */
+  GAS_bandwidth_changed_cb bw_changed;
+
+  /**
+   * Callback cls
+   */
+  void *bw_changed_cls;
+
+  struct GNUNET_CONTAINER_MultiHashMap *prefs;
+
+  struct PreferenceClient *pc_head;
+  struct PreferenceClient *pc_tail;
+};
+
+struct Network
+{
+  /**
+   * ATS network type
+   */
+  unsigned int type;
+
+  /**
+   * Network description
+   */
+  char *desc;
+
+  /**
+   * Total inbound quota
+   *
+   */
+  unsigned long long total_quota_in;
+
+  /**
+   * Total outbound quota
+   *
+   */
+  unsigned long long total_quota_out;
+
+  /**
+   * Number of active addresses for this network
+   */
+  unsigned int active_addresses;
+
+  /**
+   * Number of total addresses for this network
+   */
+  unsigned int total_addresses;
+
+  /**
+   * String for statistics total addresses
+   */
+  char *stat_total;
+
+  /**
+   * String for statistics active addresses
+   */
+  char *stat_active;
+
+  struct AddressWrapper *head;
+  struct AddressWrapper *tail;
+};
+
+struct AddressWrapper
+{
+  struct AddressWrapper *next;
+  struct AddressWrapper *prev;
+
+  struct ATS_Address *addr;
+};
+
+
+struct PreferenceClient
+{
+  struct PreferenceClient *prev;
+  struct PreferenceClient *next;
+  void *client;
+
+  double f_total[GNUNET_ATS_PreferenceCount];
+
+  struct PreferencePeer *p_head;
+  struct PreferencePeer *p_tail;
+};
+
+
+struct PreferencePeer
+{
+  struct PreferencePeer *next;
+  struct PreferencePeer *prev;
+  struct PreferenceClient *client;
+  struct GAS_SIMPLISTIC_Handle *s;
+  struct GNUNET_PeerIdentity id;
+
+  double f[GNUNET_ATS_PreferenceCount];
+  double f_rel[GNUNET_ATS_PreferenceCount];
+  double f_rel_total;
+
+  GNUNET_SCHEDULER_TaskIdentifier aging_task;
+};
+
+/**
+ * Get the prefered address for a specific peer
+ *
+ * @param solver the solver handle
+ * @param addresses the address hashmap containing all addresses
+ * @param peer the identity of the peer
+ */
+const struct ATS_Address *
+GAS_simplistic_get_preferred_address (void *solver,
+                               struct GNUNET_CONTAINER_MultiHashMap * addresses,
+                               const struct GNUNET_PeerIdentity *peer);
+
+/**
+ * Init the simplistic problem solving component
+ *
+ * Quotas:
+ * network[i] contains the network type as type GNUNET_ATS_NetworkType[i]
+ * out_quota[i] contains outbound quota for network type i
+ * in_quota[i] contains inbound quota for network type i
+ *
+ * Example
+ * network = {GNUNET_ATS_NET_UNSPECIFIED, GNUNET_ATS_NET_LOOPBACK, GNUNET_ATS_NET_LAN, GNUNET_ATS_NET_WAN, GNUNET_ATS_NET_WLAN}
+ * network[2]   == GNUNET_ATS_NET_LAN
+ * out_quota[2] == 65353
+ * in_quota[2]  == 65353
+ *
+ * @param cfg configuration handle
+ * @param stats the GNUNET_STATISTICS handle
+ * @param network array of GNUNET_ATS_NetworkType with length dest_length
+ * @param out_quota array of outbound quotas
+ * @param in_quota array of outbound quota
+ * @param dest_length array length for quota arrays
+ * @param bw_changed_cb callback for changed bandwidth amounts
+ * @param bw_changed_cb_cls cls for callback
+ * @return handle for the solver on success, NULL on fail
+ */
+void *
+GAS_simplistic_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
+                     const struct GNUNET_STATISTICS_Handle *stats,
+                     int *network,
+                     unsigned long long *out_quota,
+                     unsigned long long *in_quota,
+                     int dest_length,
+                     GAS_bandwidth_changed_cb bw_changed_cb,
+                     void *bw_changed_cb_cls)
+{
+  int c;
+  struct GAS_SIMPLISTIC_Handle *s = GNUNET_malloc (sizeof (struct GAS_SIMPLISTIC_Handle));
+  struct Network * cur;
+  char * net_str[GNUNET_ATS_NetworkTypeCount] = GNUNET_ATS_NetworkTypeString;
+
+
+  s->stats = (struct GNUNET_STATISTICS_Handle *) stats;
+  s->bw_changed = bw_changed_cb;
+  s->bw_changed_cls = bw_changed_cb_cls;
+  s->networks = dest_length;
+  s->network_entries = GNUNET_malloc (dest_length * sizeof (struct Network));
+  s->active_addresses = 0;
+  s->total_addresses = 0;
+  s->prefs = GNUNET_CONTAINER_multihashmap_create (10, GNUNET_NO);
+
+  for (c = 0; c < dest_length; c++)
+  {
+      cur = &s->network_entries[c];
+      cur->total_addresses = 0;
+      cur->active_addresses = 0;
+      cur->type = network[c];
+      cur->total_quota_in = in_quota[c];
+      cur->total_quota_out = out_quota[c];
+      cur->desc = net_str[c];
+      GNUNET_asprintf (&cur->stat_total, "# ATS addresses %s total", cur->desc);
+      GNUNET_asprintf (&cur->stat_active, "# ATS active addresses %s total", cur->desc);
+  }
+  return s;
+}
+
+static int
+free_pref (void *cls,
+           const struct GNUNET_HashCode * key,
+           void *value)
+{
+  float *v = value;
+  GNUNET_free (v);
+  return GNUNET_OK;
+}
+
+/**
+ * Shutdown the simplistic problem solving component
+ *
+ * @param solver the respective handle to shutdown
+ */
+void
+GAS_simplistic_done (void *solver)
+{
+  struct GAS_SIMPLISTIC_Handle *s = solver;
+  struct PreferenceClient *pc;
+  struct PreferenceClient *next_pc;
+  struct PreferencePeer *p;
+  struct PreferencePeer *next_p;
+  struct AddressWrapper *cur;
+  struct AddressWrapper *next;
+  int c;
+  GNUNET_assert (s != NULL);
+
+  for (c = 0; c < s->networks; c++)
+  {
+      if (s->network_entries[c].total_addresses > 0)
+      {
+        LOG (GNUNET_ERROR_TYPE_ERROR,
+                    "Had %u addresses for network `%s' not deleted during shutdown\n",
+                    s->network_entries[c].total_addresses,
+                    s->network_entries[c].desc);
+        GNUNET_break (0);
+      }
+
+      if (s->network_entries[c].active_addresses > 0)
+      {
+        LOG (GNUNET_ERROR_TYPE_ERROR,
+                    "Had %u active addresses for network `%s' not deleted during shutdown\n",
+                    s->network_entries[c].active_addresses,
+                    s->network_entries[c].desc);
+        GNUNET_break (0);
+      }
+
+      next = s->network_entries[c].head;
+      while (NULL != (cur = next))
+      {
+          next = cur->next;
+          GNUNET_CONTAINER_DLL_remove (s->network_entries[c].head,
+                                       s->network_entries[c].tail,
+                                       cur);
+          GNUNET_free (cur);
+      }
+      GNUNET_free (s->network_entries[c].stat_total);
+      GNUNET_free (s->network_entries[c].stat_active);
+  }
+  if (s->total_addresses > 0)
+  {
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+                "Had %u addresses not deleted during shutdown\n",
+                s->total_addresses);
+    GNUNET_break (0);
+  }
+  if (s->active_addresses > 0)
+  {
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+                "Had %u active addresses not deleted during shutdown\n",
+                s->active_addresses);
+    GNUNET_break (0);
+  }
+  GNUNET_free (s->network_entries);
+
+  next_pc = s->pc_head;
+  while (NULL != (pc = next_pc))
+  {
+      next_pc = pc->next;
+      GNUNET_CONTAINER_DLL_remove (s->pc_head, s->pc_tail, pc);
+      next_p = pc->p_head;
+      while (NULL != (p = next_p))
+      {
+          next_p = p->next;
+          if (GNUNET_SCHEDULER_NO_TASK != p->aging_task)
+          {
+          	GNUNET_SCHEDULER_cancel(p->aging_task);
+          	p->aging_task = GNUNET_SCHEDULER_NO_TASK;
+          }
+          GNUNET_CONTAINER_DLL_remove (pc->p_head, pc->p_tail, p);
+          GNUNET_free (p);
+      }
+      GNUNET_free (pc);
+  }
+
+  GNUNET_CONTAINER_multihashmap_iterate (s->prefs, &free_pref, NULL);
+  GNUNET_CONTAINER_multihashmap_destroy (s->prefs);
+  GNUNET_free (s);
+}
+
+
+/**
+ * Test if bandwidth is available in this network
+ *
+ * @param s the solver handle
+ * @param net the network type to update
+ * @return GNUNET_YES or GNUNET_NO
+ */
+
+static int
+bw_available_in_network (struct Network *net)
+{
+  unsigned int na = net->active_addresses + 1;
+  uint32_t min_bw = ntohl (GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT.value__);
+  if (((net->total_quota_in / na) > min_bw) &&
+      ((net->total_quota_out / na) > min_bw))
+  {    
+    LOG (GNUNET_ERROR_TYPE_DEBUG,
+         "Enough bandwidth available for %u active addresses in network `%s'\n",
+         na,
+         net->desc);
+                                                                      
+    return GNUNET_YES;
+  }
+    LOG (GNUNET_ERROR_TYPE_DEBUG,
+         "Not enough bandwidth available for %u active addresses in network `%s'\n",
+         na,
+         net->desc);  
+  return GNUNET_NO;
+}
+
+
+/**
+ * Update the quotas for a network type
+ *
+ * @param s the solver handle
+ * @param net the network type to update
+ * @param address_except address excluded from notifcation, since we suggest
+ * this address
+ */
+static void
+update_quota_per_network (struct GAS_SIMPLISTIC_Handle *s,
+                          struct Network *net,
+                          struct ATS_Address *address_except)
+{
+  unsigned long long remaining_quota_in = 0;
+  unsigned long long quota_out_used = 0;
+
+  unsigned long long remaining_quota_out = 0;
+  unsigned long long quota_in_used = 0;
+  uint32_t min_bw = ntohl (GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT.value__);
+  double total_prefs; /* Important: has to be double not float due to precision */
+  double cur_pref; /* Important: has to be double not float due to precision */
+  double *t = NULL; /* Important: has to be double not float due to precision */
+
+  unsigned long long assigned_quota_in = 0;
+  unsigned long long assigned_quota_out = 0;
+  struct AddressWrapper *cur;
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+              "Recalculate quota for network type `%s' for %u addresses (in/out): %llu/%llu \n",
+              net->desc, net->active_addresses, net->total_quota_in, net->total_quota_in);
+
+  if (net->active_addresses == 0)
+    return; /* no addresses to update */
+
+  /* Idea TODO
+   *
+   * Assign every peer in network minimum Bandwidth
+   * Distribute bandwidth left according to preference
+   */
+
+  if ((net->active_addresses * min_bw) > net->total_quota_in)
+  {
+    GNUNET_break (0);
+    return;
+  }
+  if ((net->active_addresses * min_bw) > net->total_quota_out)
+  {
+    GNUNET_break (0);
+    return;
+  }
+
+  remaining_quota_in = net->total_quota_in - (net->active_addresses * min_bw);
+  remaining_quota_out = net->total_quota_out - (net->active_addresses * min_bw);
+  LOG (GNUNET_ERROR_TYPE_DEBUG, "Remaining bandwidth : (in/out): %llu/%llu \n",
+              remaining_quota_in, remaining_quota_out);
+  total_prefs = 0.0;
+  for (cur = net->head; NULL != cur; cur = cur->next)
+  {
+      if (GNUNET_YES == cur->addr->active)
+      {
+        t = GNUNET_CONTAINER_multihashmap_get (s->prefs, &cur->addr->peer.hashPubKey);
+        if (NULL == t)
+        	total_prefs += DEFAULT_PREFERENCE;
+        else
+         {
+        		total_prefs += (*t);
+         }
+      }
+  }
+  for (cur = net->head; NULL != cur; cur = cur->next)
+  {
+     if (GNUNET_YES == cur->addr->active)
+     {
+       cur_pref = 0.0;
+       t = GNUNET_CONTAINER_multihashmap_get (s->prefs, &cur->addr->peer.hashPubKey);
+       if (NULL == t)
+         cur_pref = DEFAULT_PREFERENCE;
+       else
+         cur_pref = (*t);
+       assigned_quota_in = min_bw + ((cur_pref / total_prefs) * remaining_quota_in);
+       assigned_quota_out = min_bw + ((cur_pref / total_prefs) * remaining_quota_out);
+
+       LOG (GNUNET_ERROR_TYPE_DEBUG,
+                   "New quota for peer `%s' with preference (cur/total) %.3f/%.3f (in/out): %llu / %llu\n",
+                   GNUNET_i2s (&cur->addr->peer),
+                   cur_pref, total_prefs,
+                   assigned_quota_in, assigned_quota_out);
+     }
+     else
+     {
+       assigned_quota_in = 0;
+       assigned_quota_out = 0;
+     }
+
+     quota_in_used += assigned_quota_in;
+     quota_out_used += assigned_quota_out;
+     /* Prevent overflow due to rounding errors */
+     if (assigned_quota_in > UINT32_MAX)
+       assigned_quota_in = UINT32_MAX;
+     if (assigned_quota_out > UINT32_MAX)
+       assigned_quota_out = UINT32_MAX;
+
+     /* Compare to current bandwidth assigned */
+     if ((assigned_quota_in != ntohl(cur->addr->assigned_bw_in.value__)) ||
+         (assigned_quota_out != ntohl(cur->addr->assigned_bw_out.value__)))
+     {
+       cur->addr->assigned_bw_in.value__ = htonl (assigned_quota_in);
+       cur->addr->assigned_bw_out.value__ = htonl (assigned_quota_out);
+       /* Notify on change */
+       if ((GNUNET_YES == cur->addr->active) && (cur->addr != address_except))
+         s->bw_changed (s->bw_changed_cls, cur->addr);
+     }
+
+  }
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+                          "Total bandwidth assigned is (in/out): %llu /%llu\n",
+                          quota_in_used,
+                          quota_out_used);
+  if (quota_out_used > net->total_quota_out + 1) /* +1 is required due to rounding errors */
+  {
+      LOG (GNUNET_ERROR_TYPE_ERROR,
+                            "Total outbound bandwidth assigned is larger than allowed (used/allowed) for %u active addresses: %llu / %llu\n",
+                            net->active_addresses,
+                            quota_out_used,
+                            net->total_quota_out);
+  }
+  if (quota_in_used > net->total_quota_in + 1) /* +1 is required due to rounding errors */
+  {
+      LOG (GNUNET_ERROR_TYPE_ERROR,
+                            "Total inbound bandwidth assigned is larger than allowed (used/allowed) for %u active addresses: %llu / %llu\n",
+                            net->active_addresses,
+                            quota_in_used,
+                            net->total_quota_in);
+  }
+}
+
+static void
+update_all_networks (struct GAS_SIMPLISTIC_Handle *s)
+{
+	int i;
+	for (i = 0; i < s->networks; i++)
+		update_quota_per_network (s, &s->network_entries[i], NULL);
+
+}
+
+static void
+addresse_increment (struct GAS_SIMPLISTIC_Handle *s,
+                                struct Network *net,
+                                int total,
+                                int active)
+{
+  if (GNUNET_YES == total)
+  {
+      s->total_addresses ++;
+      net->total_addresses ++;
+      GNUNET_STATISTICS_update (s->stats, "# ATS addresses total", 1, GNUNET_NO);
+      GNUNET_STATISTICS_update (s->stats, net->stat_total, 1, GNUNET_NO);
+  }
+  if (GNUNET_YES == active)
+  {
+    net->active_addresses ++;
+    s->active_addresses ++;
+    GNUNET_STATISTICS_update (s->stats, "# ATS active addresses total", 1, GNUNET_NO);
+    GNUNET_STATISTICS_update (s->stats, net->stat_active, 1, GNUNET_NO);
+  }
+
+}
+
+static int
+addresse_decrement (struct GAS_SIMPLISTIC_Handle *s,
+                    struct Network *net,
+                    int total,
+                    int active)
+{
+  int res = GNUNET_OK;
+  if (GNUNET_YES == total)
+  {
+    if (s->total_addresses < 1)
+    {
+      GNUNET_break (0);
+      res = GNUNET_SYSERR;
+    }
+    else
+    {
+      s->total_addresses --;
+      GNUNET_STATISTICS_update (s->stats, "# ATS addresses total", -1, GNUNET_NO);
+    }
+    if (net->total_addresses < 1)
+    {
+      GNUNET_break (0);
+      res = GNUNET_SYSERR;
+    }
+    else
+    {
+      net->total_addresses --;
+      GNUNET_STATISTICS_update (s->stats, net->stat_total, -1, GNUNET_NO);
+    }
+  }
+
+  if (GNUNET_YES == active)
+  {
+    if (net->active_addresses < 1)
+    {
+      GNUNET_break (0);
+      res = GNUNET_SYSERR;
+    }
+    else
+    {
+      net->active_addresses --;
+      GNUNET_STATISTICS_update (s->stats, net->stat_active, -1, GNUNET_NO);
+    }
+    if (s->active_addresses < 1)
+    {
+      GNUNET_break (0);
+      res = GNUNET_SYSERR;
+    }
+    else
+    {
+      s->active_addresses --;
+      GNUNET_STATISTICS_update (s->stats, "# ATS addresses total", -1, GNUNET_NO);
+    }
+  }
+  return res;
+}
+
+
+/**
+ * Add a single address to the solve
+ *
+ * @param solver the solver Handle
+ * @param addresses the address hashmap containing all addresses
+ * @param address the address to add
+ */
+void
+GAS_simplistic_address_add (void *solver, struct GNUNET_CONTAINER_MultiHashMap * addresses, struct ATS_Address *address)
+{
+  struct GAS_SIMPLISTIC_Handle *s = solver;
+  struct Network *net = NULL;
+  struct AddressWrapper *aw = NULL;
+
+  GNUNET_assert (NULL != s);
+  int c;
+  for (c = 0; c < s->networks; c++)
+  {
+      net = &s->network_entries[c];
+      if (address->atsp_network_type == net->type)
+          break;
+  }
+  if (NULL == net)
+  {
+    GNUNET_break (0);
+    return;
+  }
+
+  aw = GNUNET_malloc (sizeof (struct AddressWrapper));
+  aw->addr = address;
+  GNUNET_CONTAINER_DLL_insert (net->head, net->tail, aw);
+  addresse_increment (s, net, GNUNET_YES, GNUNET_NO);
+  aw->addr->solver_information = net;
+
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG, "After adding address now total %u and active %u addresses in network `%s'\n",
+      net->total_addresses,
+      net->active_addresses,
+      net->desc);
+}
+
+/**
+ * Remove an address from the solver
+ *
+ * @param solver the solver handle
+ * @param addresses the address hashmap containing all addresses
+ * @param address the address to remove
+ * @param session_only delete only session not whole address
+ */
+void
+GAS_simplistic_address_delete (void *solver,
+    struct GNUNET_CONTAINER_MultiHashMap * addresses,
+    struct ATS_Address *address, int session_only)
+{
+  struct GAS_SIMPLISTIC_Handle *s = solver;
+  struct Network *net;
+  struct AddressWrapper *aw;
+
+  /* Remove an adress completely, we have to:
+   * - Remove from specific network
+   * - Decrease number of total addresses
+   * - If active:
+   *   - decrease number of active addreses
+   *   - update quotas
+   */
+
+  net = (struct Network *) address->solver_information;
+
+  if (GNUNET_NO == session_only)
+  {
+    LOG (GNUNET_ERROR_TYPE_DEBUG, "Deleting %s address %p for peer `%s' from network `%s' (total: %u/ active: %u)\n",
+        (GNUNET_NO == address->active) ? "inactive" : "active",
+        address, GNUNET_i2s (&address->peer),
+        net->desc, net->total_addresses, net->active_addresses);
+
+    /* Remove address */
+    addresse_decrement (s, net, GNUNET_YES, GNUNET_NO);
+    for (aw = net->head; NULL != aw; aw = aw->next)
+    {
+        if (aw->addr == address)
+          break;
+    }
+    if (NULL == aw )
+    {
+        GNUNET_break (0);
+        return;
+    }
+    GNUNET_CONTAINER_DLL_remove (net->head, net->tail, aw);
+    GNUNET_free (aw);
+  }
+  else
+  {
+      /* Remove session only: remove if active and update */
+      LOG (GNUNET_ERROR_TYPE_DEBUG, "Deleting %s session %p for peer `%s' from network `%s' (total: %u/ active: %u)\n",
+          (GNUNET_NO == address->active) ? "inactive" : "active",
+          address, GNUNET_i2s (&address->peer),
+          net->desc, net->total_addresses, net->active_addresses);
+  }
+
+  if (GNUNET_YES == address->active)
+  {
+      /* Address was active, remove from network and update quotas*/
+      address->active = GNUNET_NO;
+      if (GNUNET_SYSERR == addresse_decrement (s, net, GNUNET_NO, GNUNET_YES))
+        GNUNET_break (0);
+      update_quota_per_network (s, net, NULL);
+  }
+  LOG (GNUNET_ERROR_TYPE_DEBUG, "After deleting address now total %u and active %u addresses in network `%s'\n",
+      net->total_addresses,
+      net->active_addresses,
+      net->desc);
+
+}
+
+static struct Network *
+find_network (struct GAS_SIMPLISTIC_Handle *s, uint32_t type)
+{
+  int c;
+  for (c = 0 ; c < s->networks; c++)
+  {
+      if (s->network_entries[c].type == type)
+        return &s->network_entries[c];
+  }
+  return NULL;
+}
+
+/**
+ * Updates a single address in the solve
+ *
+ * @param solver the solver Handle
+ * @param addresses the address hashmap containing all addresses
+ * @param address the update address
+ * @param session the new session (if changed otherwise current)
+ * @param in_use the new address in use state (if changed otherwise current)
+ * @param atsi the latest ATS information
+ * @param atsi_count the atsi count
+ */
+void
+GAS_simplistic_address_update (void *solver,
+                              struct GNUNET_CONTAINER_MultiHashMap *addresses,
+                              struct ATS_Address *address,
+                              uint32_t session,
+                              int in_use,
+                              const struct GNUNET_ATS_Information *atsi,
+                              uint32_t atsi_count)
+{
+  struct ATS_Address *new;
+  struct GAS_SIMPLISTIC_Handle *s = (struct GAS_SIMPLISTIC_Handle *) solver;
+  int i;
+  uint32_t value;
+  uint32_t type;
+  int save_active = GNUNET_NO;
+  struct Network *new_net = NULL;
+  for (i = 0; i < atsi_count; i++)
+  {
+    type = ntohl (atsi[i].type);
+    value = ntohl (atsi[i].value);
+    switch (type)
+    {
+    case GNUNET_ATS_UTILIZATION_UP:
+      //if (address->atsp_utilization_out.value__ != atsi[i].value)
+
+      break;
+    case GNUNET_ATS_UTILIZATION_DOWN:
+      //if (address->atsp_utilization_in.value__ != atsi[i].value)
+
+      break;
+    case GNUNET_ATS_QUALITY_NET_DELAY:
+      //if (address->atsp_latency.rel_value != value)
+
+      break;
+    case GNUNET_ATS_QUALITY_NET_DISTANCE:
+      //if (address->atsp_distance != value)
+
+      break;
+    case GNUNET_ATS_COST_WAN:
+      //if (address->atsp_cost_wan != value)
+
+      break;
+    case GNUNET_ATS_COST_LAN:
+      //if (address->atsp_cost_lan != value)
+
+      break;
+    case GNUNET_ATS_COST_WLAN:
+      //if (address->atsp_cost_wlan != value)
+
+      break;
+    case GNUNET_ATS_NETWORK_TYPE:
+      if (address->atsp_network_type != value)
+      {
+
+        LOG (GNUNET_ERROR_TYPE_DEBUG, "Network type changed, moving %s address from `%s' to `%s'\n",
+            (GNUNET_YES == address->active) ? "active" : "inactive",
+            GNUNET_ATS_print_network_type(address->atsp_network_type),
+            GNUNET_ATS_print_network_type(value));
+
+        save_active = address->active;
+        /* remove from old network */
+        GAS_simplistic_address_delete (solver, addresses, address, GNUNET_NO);
+
+        /* set new network type */
+        address->atsp_network_type = value;
+        new_net = find_network (solver, value);
+        address->solver_information = new_net;
+        if (address->solver_information == NULL)
+        {
+            GNUNET_break (0);
+            address->atsp_network_type = GNUNET_ATS_NET_UNSPECIFIED;
+            return;
+        }
+
+        /* Add to new network and update*/
+        GAS_simplistic_address_add (solver, addresses, address);
+        if (GNUNET_YES == save_active)
+        {
+          /* check if bandwidth available in new network */
+          if (GNUNET_YES == (bw_available_in_network (new_net)))
+          {
+              /* Suggest updated address */
+              address->active = GNUNET_YES;
+              addresse_increment (s, new_net, GNUNET_NO, GNUNET_YES);
+              update_quota_per_network (solver, new_net, NULL);
+          }
+          else
+          {
+            LOG (GNUNET_ERROR_TYPE_DEBUG, "Not enough bandwidth in new network, suggesting alternative address ..\n");
+
+            /* Set old address to zero bw */
+            address->assigned_bw_in = GNUNET_BANDWIDTH_value_init (0);
+            address->assigned_bw_out = GNUNET_BANDWIDTH_value_init (0);
+            s->bw_changed  (s->bw_changed_cls, address);
+
+            /* Find new address to suggest since no bandwidth in network*/
+            new = (struct ATS_Address *) GAS_simplistic_get_preferred_address (s, addresses, &address->peer);
+            if (NULL != new)
+            {
+                /* Have an alternative address to suggest */
+                s->bw_changed  (s->bw_changed_cls, new);
+            }
+
+          }
+        }
+      }
+      break;
+    case GNUNET_ATS_ARRAY_TERMINATOR:
+      break;
+    default:
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                  "Received unsupported ATS type %u\n", type);
+      GNUNET_break (0);
+      break;
+
+    }
+
+  }
+  if (address->session_id != session)
+  {
+      LOG (GNUNET_ERROR_TYPE_DEBUG,
+                  "Session changed from %u to %u\n", address->session_id, session);
+      address->session_id = session;
+  }
+  if (address->used != in_use)
+  {
+      LOG (GNUNET_ERROR_TYPE_DEBUG,
+                  "Usage changed from %u to %u\n", address->used, in_use);
+      address->used = in_use;
+  }
+
+}
+
+
+
+/**
+ * Find a "good" address to use for a peer.  If we already have an existing
+ * address, we stick to it.  Otherwise, we pick by lowest distance and then
+ * by lowest latency.
+ *
+ * @param cls the 'struct ATS_Address**' where we store the result
+ * @param key unused
+ * @param value another 'struct ATS_Address*' to consider using
+ * @return GNUNET_OK (continue to iterate)
+ */
+static int
+find_address_it (void *cls, const struct GNUNET_HashCode * key, void *value)
+{
+  struct ATS_Address **previous_p = cls;
+  struct ATS_Address *current = (struct ATS_Address *) value;
+  struct ATS_Address *previous = *previous_p;
+  struct GNUNET_TIME_Absolute now;
+  struct Network *net = (struct Network *) current->solver_information;
+
+  now = GNUNET_TIME_absolute_get();
+
+  if (current->blocked_until.abs_value == GNUNET_TIME_absolute_max (now, current->blocked_until).abs_value)
+  {
+    /* This address is blocked for suggestion */
+    LOG (GNUNET_ERROR_TYPE_DEBUG,
+                "Address %p blocked for suggestion for %llu ms \n",
+                current,
+                GNUNET_TIME_absolute_get_difference(now, current->blocked_until).rel_value);
+    return GNUNET_OK;
+  }
+
+  if (GNUNET_NO == bw_available_in_network (net))
+    return GNUNET_OK; /* There's no bandwidth available in this network */
+
+  if (NULL != previous)
+  {
+    if ((0 == strcmp (previous->plugin, "tcp")) &&
+        (0 == strcmp (current->plugin, "tcp")))
+    {
+      if ((0 != previous->addr_len) &&
+          (0 == current->addr_len))
+      {
+        /* saved address was an outbound address, but we have an inbound address */
+        *previous_p = current;
+        return GNUNET_OK;
+      }
+      if (0 == previous->addr_len)
+      {
+        /* saved address was an inbound address, so do not overwrite */
+        return GNUNET_OK;
+      }
+    }
+  }
+
+  if (NULL == previous)
+  {
+    *previous_p = current;
+    return GNUNET_OK;
+  }
+  if ((ntohl (previous->assigned_bw_in.value__) == 0) &&
+      (ntohl (current->assigned_bw_in.value__) > 0))
+  {
+    /* stick to existing connection */
+    *previous_p = current;
+    return GNUNET_OK;
+  }
+  if (previous->atsp_distance > current->atsp_distance)
+  {
+    /* user shorter distance */
+    *previous_p = current;
+    return GNUNET_OK;
+  }
+  if (previous->atsp_latency.rel_value > current->atsp_latency.rel_value)
+  {
+    /* user lower latency */
+    *previous_p = current;
+    return GNUNET_OK;
+  }
+  /* don't care */
+  return GNUNET_OK;
+}
+
+static int
+find_active_address_it (void *cls, const struct GNUNET_HashCode * key, void *value)
+{
+  struct ATS_Address * dest = (struct ATS_Address *) (*(struct ATS_Address **)cls);
+  struct ATS_Address * aa = (struct ATS_Address *) value;
+
+  if (GNUNET_YES == aa->active)
+  {
+      if (dest != NULL)
+      {
+          /* should never happen */
+          LOG (GNUNET_ERROR_TYPE_ERROR, "Multiple active addresses for peer `%s'\n", GNUNET_i2s (&aa->peer));
+          GNUNET_break (0);
+          return GNUNET_NO;
+      }
+      dest = aa;
+  }
+  return GNUNET_OK;
+}
+
+static struct ATS_Address *
+find_active_address (void *solver,
+                     struct GNUNET_CONTAINER_MultiHashMap * addresses,
+                     const struct GNUNET_PeerIdentity *peer)
+{
+  struct ATS_Address * dest = NULL;
+
+  GNUNET_CONTAINER_multihashmap_get_multiple(addresses,
+       &peer->hashPubKey,
+       &find_active_address_it, &dest);
+  return dest;
+}
+
+/**
+ * Get the prefered address for a specific peer
+ *
+ * @param solver the solver handle
+ * @param addresses the address hashmap containing all addresses
+ * @param peer the identity of the peer
+ */
+const struct ATS_Address *
+GAS_simplistic_get_preferred_address (void *solver,
+                               struct GNUNET_CONTAINER_MultiHashMap * addresses,
+                               const struct GNUNET_PeerIdentity *peer)
+{
+  struct GAS_SIMPLISTIC_Handle *s = solver;
+  struct Network *net_prev;
+  struct Network *net_cur;
+  struct ATS_Address *cur;
+  struct ATS_Address *prev;
+
+  GNUNET_assert (s != NULL);
+  cur = NULL;
+  /* Get address with: stick to current address, lower distance, lower latency */
+  GNUNET_CONTAINER_multihashmap_get_multiple (addresses, &peer->hashPubKey,
+                                              &find_address_it, &cur);
+  if (NULL == cur)
+  {
+    LOG (GNUNET_ERROR_TYPE_DEBUG, "Cannot suggest address for peer `%s'\n", GNUNET_i2s (peer));
+    return NULL;
+  }
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG, "Suggesting %s address %p for peer `%s'\n",
+      (GNUNET_NO == cur->active) ? "inactive" : "active",
+      cur, GNUNET_i2s (peer));
+  net_cur = (struct Network *) cur->solver_information;
+  if (GNUNET_YES == cur->active)
+  {
+      /* This address was selected previously, so no need to update quotas */
+      return cur;
+  }
+
+  /* This address was not active, so we have to:
+   *
+   * - mark previous active address as not active
+   * - update quota for previous address network
+   * - update quota for this address network
+   */
+
+  prev = find_active_address (s, addresses, peer);
+  if (NULL != prev)
+  {
+      net_prev = (struct Network *) prev->solver_information;
+      prev->active = GNUNET_NO; /* No active any longer */
+      prev->assigned_bw_in = GNUNET_BANDWIDTH_value_init (0); /* no bw assigned */
+      prev->assigned_bw_out = GNUNET_BANDWIDTH_value_init (0); /* no bw assigned */
+      s->bw_changed (s->bw_changed_cls, prev); /* notify about bw change, REQUIRED? */
+      if (GNUNET_SYSERR == addresse_decrement (s, net_prev, GNUNET_NO, GNUNET_YES))
+        GNUNET_break (0);
+      update_quota_per_network (s, net_prev, NULL);
+  }
+
+  if (GNUNET_NO == (bw_available_in_network (cur->solver_information)))
+  {
+    GNUNET_break (0); /* This should never happen*/
+    return NULL;
+  }
+
+  cur->active = GNUNET_YES;
+  addresse_increment(s, net_cur, GNUNET_NO, GNUNET_YES);
+  update_quota_per_network (s, net_cur, cur);
+
+  return cur;
+}
+
+static void
+recalculate_preferences (struct PreferencePeer *p)
+{
+	struct GAS_SIMPLISTIC_Handle *s = p->s;
+	struct PreferencePeer *p_cur;
+	struct PreferenceClient *c_cur = p->client;
+	double p_rel_global;
+  double *dest;
+  int kind;
+  int rkind;
+  int clients;
+
+  /**
+   * Idea:
+   *
+   * We have:
+   * Set of clients c
+   * Set of peers p_i in P
+   * Set of preference kinds k
+   * A preference value f_k_p_i with an unknown range
+   *
+   * We get:
+   * A client specific relative preference f_p_i_rel [1..2] for all peers
+   *
+   * For every client c
+   * {
+   *   For every preference kind k:
+   *   {
+   *     We remember for the preference f_p_i for each peer p_i.
+   *     We have a default preference value f_p_i = 0
+   *     We have a sum of all preferences f_t = sum (f_p_i)
+   *     So we can calculate a relative preference value fr_p_i:
+   *
+   *     f_k_p_i_rel = (f_t + f_p_i) / f_t
+   *     f_k_p_i_rel = [1..2], default 1.0
+   *    }
+   *    f_p_i_rel = sum (f_k_p_i_rel) / #k
+   * }
+   *
+   **/
+
+  /* For this client: for all preferences, except TERMINATOR */
+  for (kind = GNUNET_ATS_PREFERENCE_END + 1 ; kind < GNUNET_ATS_PreferenceCount; kind ++)
+  {
+  	  /* Recalcalculate total preference for this quality kind over all peers*/
+  	  c_cur->f_total[kind] = 0;
+  	  for (p_cur = c_cur->p_head; NULL != p_cur; p_cur = p_cur->next)
+  	  	c_cur->f_total[kind] += p_cur->f[kind];
+
+  	  LOG (GNUNET_ERROR_TYPE_DEBUG, "Client %p has total preference for %s of %.3f\n",
+  	  		c_cur->client,
+  	      GNUNET_ATS_print_preference_type (kind),
+  	      c_cur->f_total[kind]);
+
+  	  /* Recalcalculate relative preference for all peers */
+  	  for (p_cur = c_cur->p_head; NULL != p_cur; p_cur = p_cur->next)
+  	  {
+  	    /* Calculate relative preference for specific kind */
+  	  	if (0.0 == c_cur->f_total[kind])
+  	  	{
+  	  			/* No one has preference, so set default preference */
+  	  			p_cur->f_rel[kind] = DEFAULT_PREFERENCE;
+  	  	}
+  	  	else
+  	  	{
+  	  			p_cur->f_rel[kind] = (c_cur->f_total[kind] + p_cur->f[kind]) / c_cur->f_total[kind];
+  	  	}
+  	    LOG (GNUNET_ERROR_TYPE_DEBUG, "Client %p: peer `%s' has relative preference for %s of %.3f\n",
+  	    		c_cur->client,
+  	        GNUNET_i2s (&p_cur->id),
+  	        GNUNET_ATS_print_preference_type (kind),
+  	        p_cur->f_rel[kind]);
+
+  	    /* Calculate peer relative preference */
+  	    /* Start with kind = 1 to exclude terminator */
+  	    p_cur->f_rel_total = 0;
+  	    for (rkind = GNUNET_ATS_PREFERENCE_END + 1; rkind < GNUNET_ATS_PreferenceCount; rkind ++)
+  	    {
+  	        p_cur->f_rel_total += p_cur->f_rel[rkind];
+  	    }
+  	    p_cur->f_rel_total /=  (GNUNET_ATS_PreferenceCount - 1.0); /* -1 due to terminator */
+  	    LOG (GNUNET_ERROR_TYPE_DEBUG, "Client %p: peer `%s' has total relative preference of %.3f\n",
+  	    		c_cur->client,
+  	        GNUNET_i2s (&p_cur->id),
+  	        p_cur->f_rel_total);
+  	  }
+  }
+
+  /* Calculcate global total relative peer preference over all clients */
+  p_rel_global = 0.0;
+  clients = 0;
+  for (c_cur = s->pc_head; NULL != c_cur; c_cur = c_cur->next)
+  {
+      for (p_cur = c_cur->p_head; NULL != p_cur; p_cur = p_cur->next)
+          if (0 == memcmp (&p_cur->id, &p->id, sizeof (p_cur->id)))
+              break;
+      if (NULL != p_cur)
+      {
+          clients++;
+          p_rel_global += p_cur->f_rel_total;
+      }
+  }
+  p_rel_global /= clients;
+  LOG (GNUNET_ERROR_TYPE_DEBUG, "Global preference value for peer `%s': %.3f\n",
+      GNUNET_i2s (&p->id), p_rel_global);
+
+  /* Update global map */
+  if (NULL != (dest = GNUNET_CONTAINER_multihashmap_get(s->prefs, &p->id.hashPubKey)))
+      (*dest) = p_rel_global;
+  else
+  {
+      dest = GNUNET_malloc (sizeof (double));
+      (*dest) = p_rel_global;
+      GNUNET_CONTAINER_multihashmap_put(s->prefs,
+          &p->id.hashPubKey,
+          dest,
+          GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
+  }
+}
+
+static void
+update_preference (struct PreferencePeer *p,
+									 enum GNUNET_ATS_PreferenceKind kind,
+    							 float score_f)
+{
+	double score = score_f;
+
+  /* Update preference value according to type */
+  switch (kind) {
+    case GNUNET_ATS_PREFERENCE_BANDWIDTH:
+    case GNUNET_ATS_PREFERENCE_LATENCY:
+      p->f[kind] = (p->f[kind] + score) / 2;
+      break;
+    case GNUNET_ATS_PREFERENCE_END:
+      break;
+    default:
+      break;
+  }
+  recalculate_preferences(p);
+  update_all_networks (p->s);
+}
+
+
+static void
+preference_aging (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+	int i;
+	double *t = NULL;
+	double backup;
+	struct PreferencePeer *p = cls;
+	GNUNET_assert (NULL != p);
+
+
+	p->aging_task = GNUNET_SCHEDULER_NO_TASK;
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG, "Aging preferences for peer `%s'\n",
+  		GNUNET_i2s (&p->id));
+
+  /* Issue for aging :
+   *
+   * Not for every peer preference values are set by default, so reducing the
+   * absolute preference value does not help for aging because it does not have
+   * influence on the relative values.
+   *
+   * So we have to reduce the relative value to have an immediate impact on
+   * quota calculation. In addition we cannot call recalculate_preferences here
+   * but instead reduce the absolute value to have an aging impact on future
+   * calls to change_preference where recalculate_preferences is called
+   *
+   */
+  /* Aging absolute values: */
+  for (i = 0; i < GNUNET_ATS_PreferenceCount; i++)
+  {
+  		if (p->f[i] > 1.0)
+  		{
+  			backup = p->f[i];
+  			p->f[i] *= PREF_AGING_FACTOR;
+  			LOG (GNUNET_ERROR_TYPE_DEBUG, "Aged preference for peer `%s' from %.3f to %.3f\n",
+  	  		GNUNET_i2s (&p->id), backup, p->f[i]);
+  		}
+  }
+  /* Updating relative value */
+  t = GNUNET_CONTAINER_multihashmap_get (p->s->prefs, &p->id.hashPubKey);
+  if (NULL == t)
+  {
+  	GNUNET_break (0);
+  }
+  else
+  {
+		if ((*t) > 1.0)
+			(*t) = (*t) * PREF_AGING_FACTOR;
+		else
+			(*t) = 1.0;
+		update_all_networks (p->s);
+  }
+  p->aging_task = GNUNET_SCHEDULER_add_delayed (PREF_AGING_INTERVAL,
+  		&preference_aging, p);
+}
+
+
+/**
+ * Changes the preferences for a peer in the problem
+ *
+ * @param solver the solver handle
+ * @param client the client with this preference
+ * @param peer the peer to change the preference for
+ * @param kind the kind to change the preference
+ * @param score the score
+ */
+void
+GAS_simplistic_address_change_preference (void *solver,
+                                   void *client,
+                                   const struct GNUNET_PeerIdentity *peer,
+                                   enum GNUNET_ATS_PreferenceKind kind,
+                                   float score_f)
+{
+  static struct GNUNET_TIME_Absolute next_update;
+  struct GAS_SIMPLISTIC_Handle *s = solver;
+  struct PreferenceClient *c_cur;
+  struct PreferencePeer *p_cur;
+  int i;
+
+  GNUNET_assert (NULL != solver);
+  GNUNET_assert (NULL != client);
+  GNUNET_assert (NULL != peer);
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG, "Client %p changes preference for peer `%s' %s %f\n",
+                                client,
+                                GNUNET_i2s (peer),
+                                GNUNET_ATS_print_preference_type (kind),
+                                score_f);
+
+  if (kind >= GNUNET_ATS_PreferenceCount)
+  {
+      GNUNET_break (0);
+      return;
+  }
+
+  /* Find preference client */
+  for (c_cur = s->pc_head; NULL != c_cur; c_cur = c_cur->next)
+  {
+      if (client == c_cur->client)
+        break;
+  }
+  /* Not found: create new preference client */
+  if (NULL == c_cur)
+  {
+    c_cur = GNUNET_malloc (sizeof (struct PreferenceClient));
+    c_cur->client = client;
+    GNUNET_CONTAINER_DLL_insert (s->pc_head, s->pc_tail, c_cur);
+  }
+
+  /* Find entry for peer */
+  for (p_cur = c_cur->p_head; NULL != p_cur; p_cur = p_cur->next)
+    if (0 == memcmp (&p_cur->id, peer, sizeof (p_cur->id)))
+        break;
+
+  /* Not found: create new peer entry */
+  if (NULL == p_cur)
+  {
+      p_cur = GNUNET_malloc (sizeof (struct PreferencePeer));
+      p_cur->s = s;
+      p_cur->client = c_cur;
+      p_cur->id = (*peer);
+      for (i = 0; i < GNUNET_ATS_PreferenceCount; i++)
+      {
+        /* Default value per peer absolut preference for a quality:
+         * No value set, so absolute preference 0 */
+        p_cur->f[i] = 0.0;
+        /* Default value per peer relative preference for a quality: 1.0 */
+        p_cur->f_rel[i] = DEFAULT_PREFERENCE;
+      }
+      p_cur->aging_task = GNUNET_SCHEDULER_add_delayed (PREF_AGING_INTERVAL, &preference_aging, p_cur);
+      GNUNET_CONTAINER_DLL_insert (c_cur->p_head, c_cur->p_tail, p_cur);
+  }
+
+  update_preference (p_cur, kind, score_f);
+
+  /* FIXME: We should update quotas if UPDATE_INTERVAL is reached */
+  if (GNUNET_TIME_absolute_get().abs_value > next_update.abs_value)
+  {
+      /* update quotas*/
+      next_update = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(),
+                                              MIN_UPDATE_INTERVAL);
+  }
+}
+
+/* end of gnunet-service-ats_addresses_simplistic.c */