-makefile for new test_stream_local (commented)
[oweals/gnunet.git] / src / transport / gnunet-service-transport_neighbours.c
index d66285146a94c283b0d542b8bd266e32c06c77d2..9b8fafe33230c1ac6e33875c9d8e8228da024c92 100644 (file)
@@ -57,7 +57,9 @@
 #define KEEPALIVE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
 
 
-#define ATS_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 3)
+#define ATS_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
+
+#define FAST_RECONNECT_RATE GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100)
 
 #define FAST_RECONNECT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
 
@@ -264,6 +266,12 @@ struct NeighbourMapEntry
    */
   struct GNUNET_HELLO_Address *address;
 
+  /**
+   * Address we currently use.
+   */
+  struct GNUNET_HELLO_Address *fast_reconnect_address;
+
+
   /**
    * Identity of this neighbour.
    */
@@ -322,6 +330,11 @@ struct NeighbourMapEntry
    */
   GNUNET_SCHEDULER_TaskIdentifier ats_suggest;
 
+  /**
+   * Delay for ATS request
+   */
+  GNUNET_SCHEDULER_TaskIdentifier ats_request;
+
   /**
    * Task the resets the peer state after due to an pending
    * unsuccessful connection setup
@@ -347,7 +360,16 @@ struct NeighbourMapEntry
    * Did we sent an KEEP_ALIVE message and are we expecting a response?
    */
   int expect_latency_response;
+
+  /**
+   * Was the address used successfully
+   */
   int address_state;
+
+  /**
+   * Fast reconnect attempts for identical address
+   */
+  unsigned int fast_reconnect_attempts;
 };
 
 
@@ -357,7 +379,7 @@ struct NeighbourMapEntry
 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
 
 /**
- * Closure for connect_notify_cb and disconnect_notify_cb
+ * Closure for connect_notify_cb, disconnect_notify_cb and address_change_cb
  */
 static void *callback_cls;
 
@@ -371,6 +393,11 @@ static GNUNET_TRANSPORT_NotifyConnect connect_notify_cb;
  */
 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
 
+/**
+ * Function to call when we changed an active address of a neighbour.
+ */
+static GNUNET_TRANSPORT_PeerIterateCallback address_change_cb;
+
 /**
  * counter for connected neighbours
  */
@@ -388,6 +415,14 @@ lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
   return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
 }
 
+/**
+ * Disconnect from the given neighbour, clean up the record.
+ *
+ * @param n neighbour to disconnect from
+ */
+static void
+disconnect_neighbour (struct NeighbourMapEntry *n);
+
 #define change_state(n, state, ...) change (n, state, __LINE__)
 
 static int
@@ -471,6 +506,20 @@ reset_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 #endif
 
   /* resetting state */
+
+  if (n->state == S_FAST_RECONNECT)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "Fast reconnect time out, disconnecting peer `%s'\n",
+                GNUNET_i2s (&n->id));
+    disconnect_neighbour(n);
+    return;
+  }
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "State for neighbour `%s' %X changed from `%s' to `%s' in line %u\n",
+              GNUNET_i2s (&n->id), n, print_state(n->state), "S_NOT_CONNECTED", __LINE__);
+
   n->state = S_NOT_CONNECTED;
 
   /* destroying address */
@@ -492,9 +541,12 @@ reset_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 static int
 change (struct NeighbourMapEntry *n, int state, int line)
 {
+  int previous_state;
   /* allowed transitions */
   int allowed = GNUNET_NO;
 
+  previous_state = n->state;
+
   switch (n->state)
   {
   case S_NOT_CONNECTED:
@@ -535,7 +587,6 @@ change (struct NeighbourMapEntry *n, int state, int line)
     GNUNET_free (new);
     return GNUNET_SYSERR;
   }
-#if DEBUG_TRANSPORT
   {
     char *old = GNUNET_strdup (print_state (n->state));
     char *new = GNUNET_strdup (print_state (state));
@@ -546,7 +597,6 @@ change (struct NeighbourMapEntry *n, int state, int line)
     GNUNET_free (old);
     GNUNET_free (new);
   }
-#endif
   n->state = state;
 
   switch (n->state)
@@ -584,7 +634,13 @@ change (struct NeighbourMapEntry *n, int state, int line)
     GNUNET_assert (0);
   }
 
-
+  if (NULL != address_change_cb)
+  {
+    if (n->state == S_CONNECTED)
+      address_change_cb (callback_cls, &n->id, n->address);
+    else if (previous_state == S_CONNECTED)
+      address_change_cb (callback_cls, &n->id, NULL);
+  }
 
   return GNUNET_OK;
 }
@@ -610,72 +666,18 @@ send_with_session (struct NeighbourMapEntry *n,
     return GNUNET_SYSERR;
   }
 
-  ret = papi->send_with_session (papi->cls,
-                                 n->session,
-                                 msgbuf, msgbuf_size,
-                                 0,
-                                 timeout,
-                                 cont, cont_cls);
+  ret = papi->send (papi->cls,
+                   n->session,
+                   msgbuf, msgbuf_size,
+                   0,
+                   timeout,
+                   cont, cont_cls);
 
   if ((ret == -1) && (cont != NULL))
       cont (cont_cls, &n->id, GNUNET_SYSERR);
   return ret;
 }
 
-
-
-static ssize_t
-send_with_plugin (const struct GNUNET_PeerIdentity *target, const char *msgbuf,
-                  size_t msgbuf_size, uint32_t priority,
-                  struct GNUNET_TIME_Relative timeout, struct Session *session,
-                  const struct GNUNET_HELLO_Address *address, int force_address,
-                  GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
-{
-#if TEST_NEW_CODE
-  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-              "Call to depracted function send_with_plugin\n");
-#endif
-
-  struct GNUNET_TRANSPORT_PluginFunctions *papi;
-  size_t ret = GNUNET_SYSERR;
-
-  /* FIXME : ats returns an address with all values 0 */
-  if (address == NULL)
-  {
-    if (cont != NULL)
-      cont (cont_cls, target, GNUNET_SYSERR);
-    return GNUNET_SYSERR;
-  }
-
-  if ((session == NULL) && (address->address_length == 0))
-  {
-    if (cont != NULL)
-      cont (cont_cls, target, GNUNET_SYSERR);
-    return GNUNET_SYSERR;
-  }
-
-  papi = GST_plugins_find (address->transport_name);
-  if (papi == NULL)
-  {
-    if (cont != NULL)
-      cont (cont_cls, target, GNUNET_SYSERR);
-    return GNUNET_SYSERR;
-  }
-
-  ret =
-      papi->send (papi->cls, target, msgbuf, msgbuf_size, 0, timeout, session,
-                  address->address, address->address_length, GNUNET_YES, cont,
-                  cont_cls);
-
-  if (ret == -1)
-  {
-    if (cont != NULL)
-      cont (cont_cls, target, GNUNET_SYSERR);
-  }
-  return ret;
-}
-
-
 /**
  * Task invoked to start a transmission to another peer.
  *
@@ -793,18 +795,10 @@ try_transmission_to_peer (struct NeighbourMapEntry *n)
     return;
   }
 
-#if TEST_NEW_CODE
   ret = send_with_session(n,
               mq->message_buf, mq->message_buf_size,
               0, timeout,
               &transmit_send_continuation, mq);
-#else
-  ret = send_with_plugin (&n->id,
-                          mq->message_buf, mq->message_buf_size,
-                          0, timeout,
-                          n->session, n->address, GNUNET_YES,
-                          &transmit_send_continuation, mq);
-#endif
 
   if (ret == -1)
   {
@@ -839,14 +833,19 @@ transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
  * @param cls closure for callbacks
  * @param connect_cb function to call if we connect to a peer
  * @param disconnect_cb function to call if we disconnect from a peer
+ * @param peer_address_cb function to call if we change an active address
+ *                   of a neighbour
  */
 void
-GST_neighbours_start (void *cls, GNUNET_TRANSPORT_NotifyConnect connect_cb,
-                      GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb)
+GST_neighbours_start (void *cls,
+                      GNUNET_TRANSPORT_NotifyConnect connect_cb,
+                      GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
+                      GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
 {
   callback_cls = cls;
   connect_notify_cb = connect_cb;
   disconnect_notify_cb = disconnect_cb;
+  address_change_cb = peer_address_cb;
   neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
 }
 
@@ -870,9 +869,9 @@ send_disconnect (struct NeighbourMapEntry * n)
   struct SessionDisconnectMessage disconnect_msg;
 
 #if DEBUG_TRANSPORT
-  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Sending DISCONNECT message to peer `%4s'\n",
-              GNUNET_i2s (target));
+              GNUNET_i2s (&n->id));
 #endif
 
   disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
@@ -893,18 +892,10 @@ send_disconnect (struct NeighbourMapEntry * n)
                                          &disconnect_msg.purpose,
                                          &disconnect_msg.signature));
 
-#if TEST_NEW_CODE
   ret = send_with_session (n,
             (const char *) &disconnect_msg, sizeof (disconnect_msg),
             UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
             &send_disconnect_cont, NULL);
-#else
-  ret = send_with_plugin (&n->id,
-                        (const char *) &disconnect_msg, sizeof (disconnect_msg),
-                        UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
-                        n->session, n->address,
-                        GNUNET_YES, &send_disconnect_cont, NULL);
-#endif
 
   if (ret == GNUNET_SYSERR)
     return GNUNET_SYSERR;
@@ -952,7 +943,7 @@ disconnect_neighbour (struct NeighbourMapEntry *n)
     GNUNET_assert (NULL != n->address);
     if (n->address_state == USED)
     {
-      GST_validation_set_address_use (n->address, n->session, GNUNET_NO);
+      GST_validation_set_address_use (n->address, n->session, GNUNET_NO, __LINE__);
       GNUNET_ATS_address_in_use (GST_ats, n->address, n->session, GNUNET_NO);
       n->address_state = UNUSED;
     }
@@ -1012,6 +1003,12 @@ disconnect_neighbour (struct NeighbourMapEntry *n)
     GNUNET_SCHEDULER_cancel (n->ats_suggest);
     n->ats_suggest = GNUNET_SCHEDULER_NO_TASK;
   }
+  if (n->ats_request != GNUNET_SCHEDULER_NO_TASK)
+  {
+    GNUNET_SCHEDULER_cancel (n->ats_request);
+    n->ats_request = GNUNET_SCHEDULER_NO_TASK;
+  }
+
   if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
   {
     GNUNET_SCHEDULER_cancel (n->timeout_task);
@@ -1022,6 +1019,11 @@ disconnect_neighbour (struct NeighbourMapEntry *n)
     GNUNET_SCHEDULER_cancel (n->transmission_task);
     n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
   }
+  if (NULL != n->fast_reconnect_address)
+  {
+    GNUNET_HELLO_address_free (n->fast_reconnect_address);
+    n->fast_reconnect_address = NULL;
+  }
   if (NULL != n->address)
   {
     GNUNET_HELLO_address_free (n->address);
@@ -1047,6 +1049,8 @@ neighbour_timeout_task (void *cls,
   struct NeighbourMapEntry *n = cls;
 
   n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer`%4s' disconnected due to timeout\n",
+              GNUNET_i2s (&n->id));
 
   GNUNET_STATISTICS_update (GST_stats,
                             gettext_noop
@@ -1080,18 +1084,11 @@ neighbour_keepalive_task (void *cls,
   m.size = htons (sizeof (struct GNUNET_MessageHeader));
   m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
 
-#if TEST_NEW_CODE
   ret = send_with_session (n,
             (const void *) &m, sizeof (m),
             UINT32_MAX /* priority */ ,
             GNUNET_TIME_UNIT_FOREVER_REL,
             NULL, NULL);
-#else
-  ret = send_with_plugin (&n->id, (const void *) &m, sizeof (m),
-                        UINT32_MAX /* priority */ ,
-                        GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->address,
-                        GNUNET_YES, NULL, NULL);
-#endif
 
   n->expect_latency_response = GNUNET_NO;
   n->keep_alive_sent = GNUNET_TIME_absolute_get_zero ();
@@ -1141,6 +1138,10 @@ ats_suggest_cancel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
               "ATS did not suggested address to connect to peer `%s'\n",
               GNUNET_i2s (&n->id));
 
+  GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# ATS address suggestions failed"), 1,
+                            GNUNET_NO);
+
+
   disconnect_neighbour (n);
 }
 
@@ -1164,6 +1165,7 @@ GST_neighbours_stop ()
   callback_cls = NULL;
   connect_notify_cb = NULL;
   disconnect_notify_cb = NULL;
+  address_change_cb = NULL;
 }
 
 struct ContinutionContext
@@ -1249,6 +1251,18 @@ send_connect_continuation (void *cls, const struct GNUNET_PeerIdentity *target,
 }
 
 
+static void
+ats_request (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  struct NeighbourMapEntry *n = cls;
+  n->ats_request = GNUNET_SCHEDULER_NO_TASK;
+
+  n->ats_suggest =
+    GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel,
+                                  n);
+}
+
+
 /**
  * We tried to switch addresses with an peer already connected. If it failed,
  * we should tell ATS to not use this address anymore (until it is re-validated).
@@ -1283,20 +1297,42 @@ send_switch_address_continuation (void *cls,
   GNUNET_assert ((n->state == S_CONNECTED) || (n->state == S_FAST_RECONNECT));
   if (GNUNET_YES != success)
   {
-#if DEBUG_TRANSPORT
+
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-                "Failed to switch connected peer `%s' to address '%s' session %X, asking ATS for new address \n",
-                GNUNET_i2s (&n->id), GST_plugins_a2s (n->address), n->session);
-#endif
+                "Failed to switch connected peer `%s' in state %s to address '%s' session %X, asking ATS for new address \n",
+                GNUNET_i2s (&n->id), print_state(n->state), GST_plugins_a2s (cc->address), cc->session);
+
     GNUNET_assert (strlen (cc->address->transport_name) > 0);
     GNUNET_ATS_address_destroyed (GST_ats, cc->address, cc->session);
 
     if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
+    {
       GNUNET_SCHEDULER_cancel (n->ats_suggest);
-    n->ats_suggest =
+      n->ats_suggest = GNUNET_SCHEDULER_NO_TASK;
+    }
+
+    if (n->state == S_FAST_RECONNECT)
+    {
+      if (GNUNET_SCHEDULER_NO_TASK == n->ats_request)
+      {
+        /* Throtteled ATS request for fast reconnect */
+        struct GNUNET_TIME_Relative delay = GNUNET_TIME_relative_multiply(FAST_RECONNECT_RATE, n->fast_reconnect_attempts);
+        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                    "Fast reconnect attempt %u failed, delay ATS request for %llu ms\n", n->fast_reconnect_attempts, delay.rel_value);
+        n->ats_request =
+            GNUNET_SCHEDULER_add_delayed (delay,
+                                          ats_request,
+                                          n);
+      }
+    }
+    else
+    {
+      /* Immediate ATS request for connected peers */
+      n->ats_suggest =
         GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel,
                                       n);
-    GNUNET_ATS_suggest_address (GST_ats, &n->id);
+      GNUNET_ATS_suggest_address (GST_ats, &n->id);
+    }
     GNUNET_HELLO_address_free (cc->address);
     GNUNET_free (cc);
     return;
@@ -1307,8 +1343,10 @@ send_switch_address_continuation (void *cls,
   case S_CONNECTED:
     if (n->address_state == FRESH)
     {
-      GST_validation_set_address_use (cc->address, cc->session, GNUNET_YES);
+      GST_validation_set_address_use (cc->address, cc->session, GNUNET_YES,  __LINE__);
       GNUNET_ATS_address_update (GST_ats, cc->address, cc->session, NULL, 0);
+      if (cc->session != n->session)
+        GNUNET_break (0);
       GNUNET_ATS_address_in_use (GST_ats, cc->address, cc->session, GNUNET_YES);
       n->address_state = USED;
     }
@@ -1326,7 +1364,7 @@ send_switch_address_continuation (void *cls,
 
     if (n->address_state == FRESH)
     {
-      GST_validation_set_address_use (cc->address, cc->session, GNUNET_YES);
+      GST_validation_set_address_use (cc->address, cc->session, GNUNET_YES,  __LINE__);
       GNUNET_ATS_address_update (GST_ats, cc->address, cc->session, NULL, 0);
       GNUNET_ATS_address_in_use (GST_ats, cc->address, cc->session, GNUNET_YES);
       n->address_state = USED;
@@ -1410,7 +1448,7 @@ send_connect_ack_continuation (void *cls,
 
 /**
  * For an existing neighbour record, set the active connection to
- * the given address.
+ * use the given address.
  *
  * @param peer identity of the peer to switch the address for
  * @param address address of the other peer, NULL if other peer
@@ -1418,6 +1456,8 @@ send_connect_ack_continuation (void *cls,
  * @param session session to use (or NULL)
  * @param ats performance data
  * @param ats_count number of entries in ats
+ * @param bandwidth_in inbound quota to be used when connection is up
+ * @param bandwidth_out outbound quota to be used when connection is up
  * @return GNUNET_YES if we are currently connected, GNUNET_NO if the
  *         connection is not up (yet)
  */
@@ -1464,17 +1504,43 @@ GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
   }
 
   /* checks successful and neighbour != NULL */
-#if DEBUG_TRANSPORT
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "ATS tells us to switch to address '%s' session %p for peer `%s' in state `%s'\n",
-              GST_plugins_a2s (address), session, GNUNET_i2s (peer),
+              (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
+              session,
+              GNUNET_i2s (peer),
               print_state (n->state));
-#endif
+
   if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
   {
     GNUNET_SCHEDULER_cancel (n->ats_suggest);
     n->ats_suggest = GNUNET_SCHEDULER_NO_TASK;
   }
+
+
+  if (n->state == S_FAST_RECONNECT)
+  {
+    /* Throtteled fast reconnect */
+
+    if (NULL == n->fast_reconnect_address)
+    {
+      n->fast_reconnect_address = GNUNET_HELLO_address_copy (address);
+
+    }
+    else if (0 == GNUNET_HELLO_address_cmp(address, n->fast_reconnect_address))
+    {
+      n->fast_reconnect_attempts ++;
+
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "FAST RECONNECT to peer `%s' and address '%s' with identical address attempt %u\n",
+                GNUNET_i2s (&n->id), GST_plugins_a2s (address), n->fast_reconnect_attempts);
+    }
+  }
+  else
+  {
+    n->fast_reconnect_attempts = 0;
+  }
+
   /* do not switch addresses just update quotas */
   if ((n->state == S_CONNECTED) && (NULL != n->address) &&
       (0 == GNUNET_HELLO_address_cmp (address, n->address)) &&
@@ -1492,11 +1558,10 @@ GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
     GNUNET_assert (NULL != n->address);
     if (n->address_state == USED)
     {
-      GST_validation_set_address_use (n->address, n->session, GNUNET_NO);
+      GST_validation_set_address_use (n->address, n->session, GNUNET_NO,  __LINE__);
       GNUNET_ATS_address_in_use (GST_ats, n->address, n->session, GNUNET_NO);
       n->address_state = UNUSED;
     }
-
   }
 
   /* set new address */
@@ -1511,18 +1576,37 @@ GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
       GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
                                     &neighbour_timeout_task, n);
 
-#if TEST_NEW_CODE
+  if (NULL != address_change_cb && n->state == S_CONNECTED)
+    address_change_cb (callback_cls, &n->id, n->address); 
+
   /* Obtain an session for this address from plugin */
   struct GNUNET_TRANSPORT_PluginFunctions *papi;
   papi = GST_plugins_find (address->transport_name);
-  GNUNET_assert (papi != NULL);
+
+  if (papi == NULL)
+  {
+    /* we don't have the plugin for this address */
+    GNUNET_ATS_address_destroyed (GST_ats, n->address, NULL);
+
+    if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
+      GNUNET_SCHEDULER_cancel (n->ats_suggest);
+    n->ats_suggest =  GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT,
+                                      ats_suggest_cancel,
+                                      n);
+    GNUNET_ATS_suggest_address (GST_ats, &n->id);
+    GNUNET_HELLO_address_free (n->address);
+    n->address = NULL;
+    n->session = NULL;
+    return GNUNET_NO;
+  }
+
   if (session == NULL)
   {
     n->session = papi->get_session (papi->cls, address);
     /* Session could not be initiated */
     if (n->session == NULL)
     {
-      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                   "Failed to obtain new session %p for peer `%s' and  address '%s'\n",
                   n->session, GNUNET_i2s (&n->id), GST_plugins_a2s (n->address));
 
@@ -1536,10 +1620,11 @@ GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
       GNUNET_ATS_suggest_address (GST_ats, &n->id);
       GNUNET_HELLO_address_free (n->address);
       n->address = NULL;
+      n->session = NULL;
       return GNUNET_NO;
     }
 
-    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Obtained new session %p for peer `%s' and  address '%s'\n",
                  n->session, GNUNET_i2s (&n->id), GST_plugins_a2s (n->address));
     /* Telling ATS about new session */
@@ -1547,21 +1632,13 @@ GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
   }
   else
   {
-    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-                "Using existing session %p for peer `%s' and  address '%s'\n",
-                n->session, GNUNET_i2s (&n->id), GST_plugins_a2s (n->address));
     n->session = session;
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "Using existing session %p for peer `%s' and  address '%s'\n",
+                n->session,
+                GNUNET_i2s (&n->id),
+                (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>");
   }
-  /* remove this dummy */
-  if (NULL != NULL) send_with_plugin (NULL, NULL, 0,
-      UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL, NULL,
-      NULL, GNUNET_YES, NULL, NULL);
-#else
-  n->session = session;
-
-  /* dummy */
-  if (NULL != NULL) send_with_session( NULL, NULL, 0, 0, GNUNET_TIME_relative_get_zero(), NULL, NULL);
-#endif
 
   switch (n->state)
   {
@@ -1576,20 +1653,13 @@ GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
         GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
 
     cc = GNUNET_malloc (sizeof (struct ContinutionContext));
-    cc->session = session;
+    cc->session = n->session;
     cc->address = GNUNET_HELLO_address_copy (address);
 
-#if TEST_NEW_CODE
-  ret = send_with_session (n,
+    ret = send_with_session (n,
       (const char *) &connect_msg, msg_len,
       UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
       &send_connect_continuation, cc);
-#else
-  ret =
-      send_with_plugin (peer, (const char *) &connect_msg, msg_len,
-                        UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL, session,
-                        address, GNUNET_YES, &send_connect_continuation, cc);
-#endif
 
     return GNUNET_NO;
   case S_CONNECT_RECV:
@@ -1602,21 +1672,14 @@ GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
     connect_msg.timestamp =
         GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
     cc = GNUNET_malloc (sizeof (struct ContinutionContext));
-    cc->session = session;
+    cc->session = n->session;
     cc->address = GNUNET_HELLO_address_copy (address);
-#if TEST_NEW_CODE
+
     ret = send_with_session(n,
                             (const void *) &connect_msg, msg_len,
                             UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
                             &send_connect_ack_continuation,
                             cc);
-#else
-    ret =
-        send_with_plugin (&n->id, (const void *) &connect_msg, msg_len,
-                          UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL, session,
-                          address, GNUNET_YES, &send_connect_ack_continuation,
-                          cc);
-#endif
     return GNUNET_NO;
   case S_CONNECTED:
   case S_FAST_RECONNECT:
@@ -1629,23 +1692,12 @@ GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
     connect_msg.timestamp =
         GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
     cc = GNUNET_malloc (sizeof (struct ContinutionContext));
-    cc->session = session;
+    cc->session = n->session;
     cc->address = GNUNET_HELLO_address_copy (address);
-
-#if TEST_NEW_CODE
     ret = send_with_session(n,
                             (const void *) &connect_msg, msg_len,
                             UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
                             &send_switch_address_continuation, cc);
-#else
-    ret =
-        send_with_plugin (peer, (const char *) &connect_msg, msg_len,
-                          UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL, session,
-                          address, GNUNET_YES,
-                          &send_switch_address_continuation, cc);
-#endif
-
-
     if (ret == GNUNET_SYSERR)
     {
       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
@@ -1837,9 +1889,10 @@ GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
   {
     if (n->address_state == USED)
     {
-      GST_validation_set_address_use (n->address, n->session, GNUNET_NO);
+      GST_validation_set_address_use (n->address, n->session, GNUNET_NO,  __LINE__);
       GNUNET_ATS_address_in_use (GST_ats, n->address, n->session, GNUNET_NO);
       n->address_state = UNUSED;
+
     }
   }
 
@@ -1866,10 +1919,10 @@ GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
    * neighbours_connected -= 1
    * BUT: no disconnect_cb to notify clients about disconnect
    */
-#if DEBUG_TRANSPORT
+
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying fast reconnect to peer `%s'\n",
               GNUNET_i2s (peer));
-#endif
+
   GNUNET_assert (neighbours_connected > 0);
   change_state (n, S_FAST_RECONNECT);
   neighbours_connected--;
@@ -1884,7 +1937,8 @@ GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
   /* try QUICKLY to re-establish a connection, reduce timeout! */
   if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
     GNUNET_SCHEDULER_cancel (n->ats_suggest);
-  n->ats_suggest = GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, &ats_suggest_cancel,
+  n->ats_suggest = GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT,
+                                    &ats_suggest_cancel,
                                     n);
   GNUNET_ATS_suggest_address (GST_ats, peer);
 }
@@ -2109,22 +2163,11 @@ GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
   m.size = htons (sizeof (struct GNUNET_MessageHeader));
   m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
 
-#if TEST_NEW_CODE
   send_with_session(n,
       (const void *) &m, sizeof (m),
       UINT32_MAX,
       GNUNET_TIME_UNIT_FOREVER_REL,
       NULL, NULL);
-#else
-  send_with_plugin (&n->id,
-      (const void *) &m, sizeof (m),
-      UINT32_MAX /* priority */ ,
-      GNUNET_TIME_UNIT_FOREVER_REL,
-      n->session, n->address,
-      GNUNET_YES, NULL, NULL);
-#endif
-
-
 }
 
 /**
@@ -2436,11 +2479,9 @@ GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
   size_t msg_len;
   size_t ret;
 
-#if DEBUG_TRANSPORT
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Received CONNECT_ACK message from peer `%s'\n",
               GNUNET_i2s (peer));
-#endif
 
   if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
   {
@@ -2467,6 +2508,31 @@ GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
    * We also received an CONNECT message, switched from SENDT to RECV and
    * ATS already suggested us an address after a successful blacklist check
    */
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Received CONNECT_ACK message from peer `%s' in state `%s'\n",
+              GNUNET_i2s (peer),
+              print_state(n->state));
+
+  if ((n->address != NULL) && (n->state == S_CONNECTED))
+  {
+    /* After fast reconnect: send ACK (ACK) even when we are connected */
+    msg_len = sizeof (msg);
+    msg.size = htons (msg_len);
+    msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
+
+    ret = send_with_session(n,
+              (const char *) &msg, msg_len,
+              UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
+              NULL, NULL);
+
+    if (ret == GNUNET_SYSERR)
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                  "Failed to send SESSION_ACK to `%4s' using address '%s' session %X\n",
+                  GNUNET_i2s (&n->id), GST_plugins_a2s (n->address), n->session);
+    return;
+  }
+
   if ((n->state != S_CONNECT_SENT) &&
       ((n->state != S_CONNECT_RECV) && (n->address != NULL)))
   {
@@ -2476,8 +2542,8 @@ GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
                               GNUNET_NO);
     return;
   }
-
-  change_state (n, S_CONNECTED);
+  if (n->state != S_CONNECTED)
+    change_state (n, S_CONNECTED);
 
   if (NULL != session)
   {
@@ -2488,10 +2554,10 @@ GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
   }
   GNUNET_ATS_address_update (GST_ats, address, session, ats, ats_count);
   GNUNET_assert (NULL != n->address);
-//LOOKAT
+
   if ((n->address_state == FRESH) && (0 == GNUNET_HELLO_address_cmp(address, n->address)))
   {
-    GST_validation_set_address_use (n->address, n->session, GNUNET_YES);
+    GST_validation_set_address_use (n->address, n->session, GNUNET_YES,  __LINE__);
     GNUNET_ATS_address_in_use (GST_ats, n->address, n->session, GNUNET_YES);
     n->address_state = USED;
   }
@@ -2503,19 +2569,10 @@ GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
   msg.size = htons (msg_len);
   msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
 
-#if TEST_NEW_CODE
   ret = send_with_session(n,
             (const char *) &msg, msg_len,
             UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
             NULL, NULL);
-#else
-  ret =
-      send_with_plugin (&n->id,
-                        (const char *) &msg, msg_len,
-                        UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
-                        n->session, n->address, GNUNET_YES,
-                        NULL, NULL);
-#endif
 
   if (ret == GNUNET_SYSERR)
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
@@ -2584,10 +2641,10 @@ GST_neighbours_handle_ack (const struct GNUNET_MessageHeader *message,
                      session, address->transport_name, GNUNET_i2s (peer));
   GNUNET_ATS_address_update (GST_ats, address, session, ats, ats_count);
   GNUNET_assert (n->address != NULL);
-// LOOKAT
+
   if ((n->address_state == FRESH) && (0 == GNUNET_HELLO_address_cmp(address, n->address)))
   {
-    GST_validation_set_address_use (n->address, n->session, GNUNET_YES);
+    GST_validation_set_address_use (n->address, n->session, GNUNET_YES,  __LINE__);
     GNUNET_ATS_address_in_use (GST_ats, n->address, n->session, GNUNET_YES);
     n->address_state = USED;
   }
@@ -2723,9 +2780,9 @@ GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
   GNUNET_ATS_address_update (GST_ats, address, session, ats, ats_count);
 
   n = lookup_neighbour (peer);
-  if ((n != NULL) && (S_CONNECTED == n->state))
+  if ((n != NULL) && ((S_CONNECTED == n->state) || (S_FAST_RECONNECT == n->state)))
   {
-    /* connected peer switches addresses */
+    /* connected peer switches addresses or is trying to do a fast reconnect*/
     return;
   }
 
@@ -2745,7 +2802,7 @@ GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
   bcc->ats[ats_count].value =
       htonl ((uint32_t) GST_neighbour_get_latency (peer).rel_value);
   GST_blacklist_test_allowed (peer, address->transport_name,
-                              handle_connect_blacklist_cont, bcc);
+                              &handle_connect_blacklist_cont, bcc);
 }