tolerate additional IPv4 address now available for gnunet.org
[oweals/gnunet.git] / src / fs / gnunet-service-fs_cp.c
index 67338b6ec1c6997a9a1e50e7c48c025a65c64eac..a3a52122171614610ff38bc187af2732911e9110 100644 (file)
@@ -1,21 +1,21 @@
 /*
      This file is part of GNUnet.
-     Copyright (C) 2011 Christian Grothoff (and other contributing authors)
+     Copyright (C) 2011, 2016 GNUnet e.V.
 
-     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 free software: you can redistribute it and/or modify it
+     under the terms of the GNU Affero General Public License as published
+     by the Free Software Foundation, either version 3 of the License,
+     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.
+     Affero General Public License for more details.
+    
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-     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., 51 Franklin Street, Fifth Floor,
-     Boston, MA 02110-1301, USA.
+     SPDX-License-Identifier: AGPL3.0-or-later
 */
 /**
  * @file fs/gnunet-service-fs_cp.c
@@ -78,35 +78,15 @@ struct GSF_PeerTransmitHandle
   struct GNUNET_TIME_Absolute transmission_request_start_time;
 
   /**
-   * Timeout for this request.
+   * Envelope with the actual message.
    */
-  struct GNUNET_TIME_Absolute timeout;
-
-  /**
-   * Task called on timeout, or 0 for none.
-   */
-  struct GNUNET_SCHEDULER_Task *timeout_task;
-
-  /**
-   * Function to call to get the actual message.
-   */
-  GSF_GetMessageCallback gmc;
+  struct GNUNET_MQ_Envelope *env;
 
   /**
    * Peer this request targets.
    */
   struct GSF_ConnectedPeer *cp;
 
-  /**
-   * Closure for @e gmc.
-   */
-  void *gmc_cls;
-
-  /**
-   * Size of the message to be transmitted.
-   */
-  size_t size;
-
   /**
    * #GNUNET_YES if this is a query, #GNUNET_NO for content.
    */
@@ -147,9 +127,9 @@ struct GSF_DelayedHandle
   struct GSF_ConnectedPeer *cp;
 
   /**
-   * The PUT that was delayed.
+   * Envelope of the message that was delayed.
    */
-  struct PutMessage *pm;
+  struct GNUNET_MQ_Envelope *env;
 
   /**
    * Task for the delay.
@@ -171,12 +151,12 @@ struct PeerRequest
 {
 
   /**
-   * Handle to generic request.
+   * Handle to generic request (generic: from peer or local client).
    */
   struct GSF_PendingRequest *pr;
 
   /**
-   * Handle to specific peer.
+   * Which specific peer issued this request?
    */
   struct GSF_ConnectedPeer *cp;
 
@@ -234,11 +214,6 @@ struct GSF_ConnectedPeer
    */
   struct GSF_DelayedHandle *delayed_tail;
 
-  /**
-   * Migration stop message in our queue, or NULL if we have none pending.
-   */
-  struct GSF_PeerTransmitHandle *migration_pth;
-
   /**
    * Context of our GNUNET_ATS_reserve_bandwidth call (or NULL).
    */
@@ -250,15 +225,15 @@ struct GSF_ConnectedPeer
   struct GNUNET_SCHEDULER_Task *rc_delay_task;
 
   /**
-   * Active requests from this neighbour, map of query to 'struct PeerRequest'.
+   * Active requests from this neighbour, map of query to `struct PeerRequest`.
    */
   struct GNUNET_CONTAINER_MultiHashMap *request_map;
 
   /**
    * Handle for an active request for transmission to this
-   * peer, or NULL (if core queue was full).
+   * peer.
    */
-  struct GNUNET_CORE_TransmitHandle *cth;
+  struct GNUNET_MQ_Handle *mq;
 
   /**
    * Increase in traffic preference still to be submitted
@@ -266,14 +241,6 @@ struct GSF_ConnectedPeer
    */
   uint64_t inc_preference;
 
-  /**
-   * Set to 1 if we're currently in the process of calling
-   * #GNUNET_CORE_notify_transmit_ready() (so while @e cth is
-   * NULL, we should not call notify_transmit_ready for this
-   * handle right now).
-   */
-  unsigned int cth_in_progress;
-
   /**
    * Number of entries in @e delayed_head DLL.
    */
@@ -307,16 +274,6 @@ struct GSF_ConnectedPeer
    */
   int did_reserve;
 
-  /**
-   * Function called when the creation of this record is complete.
-   */
-  GSF_ConnectedPeerCreationCallback creation_cb;
-
-  /**
-   * Closure for @e creation_cb
-   */
-  void *creation_cb_cls;
-
   /**
    * Handle to the PEERSTORE iterate request for peer respect value
    */
@@ -335,6 +292,11 @@ static struct GNUNET_CONTAINER_MultiPeerMap *cp_map;
  */
 static struct GNUNET_PEERSTORE_Handle *peerstore;
 
+/**
+ * Task used to flush respect values to disk.
+ */
+static struct GNUNET_SCHEDULER_Task *fr_task;
+
 
 /**
  * Update the latency information kept for the given peer.
@@ -372,15 +334,10 @@ GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
 /**
  * Core is ready to transmit to a peer, get the message.
  *
- * @param cls the `struct GSF_PeerTransmitHandle` of the message
- * @param size number of bytes core is willing to take
- * @param buf where to copy the message
- * @return number of bytes copied to @a buf
+ * @param cp which peer to send a message to
  */
-static size_t
-peer_transmit_ready_cb (void *cls,
-                        size_t size,
-                        void *buf);
+static void
+peer_transmit (struct GSF_ConnectedPeer *cp);
 
 
 /**
@@ -413,8 +370,6 @@ schedule_transmission (struct GSF_PeerTransmitHandle *pth)
   struct GNUNET_PeerIdentity target;
 
   cp = pth->cp;
-  if ((NULL != cp->cth) || (0 != cp->cth_in_progress))
-    return;                     /* already done */
   GNUNET_assert (0 != cp->ppd.pid);
   GNUNET_PEER_resolve (cp->ppd.pid, &target);
 
@@ -444,52 +399,23 @@ schedule_transmission (struct GSF_PeerTransmitHandle *pth)
                                            cp);
     return;
   }
-  GNUNET_assert (NULL == cp->cth);
-  cp->cth_in_progress++;
-  cp->cth =
-    GNUNET_CORE_notify_transmit_ready (GSF_core,
-                                       GNUNET_YES,
-                                       GNUNET_CORE_PRIO_BACKGROUND,
-                                      GNUNET_TIME_absolute_get_remaining (pth->timeout),
-                                       &target,
-                                       pth->size,
-                                      &peer_transmit_ready_cb, cp);
-  GNUNET_assert (NULL != cp->cth);
-  GNUNET_assert (0 < cp->cth_in_progress--);
+  peer_transmit (cp);
 }
 
 
 /**
  * Core is ready to transmit to a peer, get the message.
  *
- * @param cls the `struct GSF_PeerTransmitHandle` of the message
- * @param size number of bytes core is willing to take
- * @param buf where to copy the message
- * @return number of bytes copied to @a buf
+ * @param cp which peer to send a message to
  */
-static size_t
-peer_transmit_ready_cb (void *cls,
-                        size_t size,
-                        void *buf)
+static void
+peer_transmit (struct GSF_ConnectedPeer *cp)
 {
-  struct GSF_ConnectedPeer *cp = cls;
   struct GSF_PeerTransmitHandle *pth = cp->pth_head;
   struct GSF_PeerTransmitHandle *pos;
-  size_t ret;
 
-  cp->cth = NULL;
   if (NULL == pth)
-    return 0;
-  if (pth->size > size)
-  {
-    schedule_transmission (pth);
-    return 0;
-  }
-  if (NULL != pth->timeout_task)
-  {
-    GNUNET_SCHEDULER_cancel (pth->timeout_task);
-    pth->timeout_task = NULL;
-  }
+    return;
   GNUNET_CONTAINER_DLL_remove (cp->pth_head,
                                cp->pth_tail,
                                pth);
@@ -507,14 +433,14 @@ peer_transmit_ready_cb (void *cls,
   GNUNET_LOAD_update (cp->ppd.transmission_delay,
                       GNUNET_TIME_absolute_get_duration
                       (pth->transmission_request_start_time).rel_value_us);
-  ret = pth->gmc (pth->gmc_cls, size, buf);
+  GNUNET_MQ_send (cp->mq,
+                 pth->env);
+  GNUNET_free (pth);
   if (NULL != (pos = cp->pth_head))
   {
     GNUNET_assert (pos != pth);
     schedule_transmission (pos);
   }
-  GNUNET_free (pth);
-  return ret;
 }
 
 
@@ -522,11 +448,9 @@ peer_transmit_ready_cb (void *cls,
  * (re)try to reserve bandwidth from the given peer.
  *
  * @param cls the `struct GSF_ConnectedPeer` to reserve from
- * @param tc scheduler context
  */
 static void
-retry_reservation (void *cls,
-                   const struct GNUNET_SCHEDULER_TaskContext *tc)
+retry_reservation (void *cls)
 {
   struct GSF_ConnectedPeer *cp = cls;
   struct GNUNET_PeerIdentity target;
@@ -575,23 +499,10 @@ ats_reserve_callback (void *cls,
   }
   cp->did_reserve = GNUNET_YES;
   pth = cp->pth_head;
-  if ( (NULL != pth) &&
-       (NULL == cp->cth) &&
-       (0 == cp->cth_in_progress) )
+  if (NULL != pth)
   {
     /* reservation success, try transmission now! */
-    cp->cth_in_progress++;
-    cp->cth =
-        GNUNET_CORE_notify_transmit_ready (GSF_core,
-                                           GNUNET_YES,
-                                           GNUNET_CORE_PRIO_BACKGROUND,
-                                           GNUNET_TIME_absolute_get_remaining (pth->timeout),
-                                           peer,
-                                           pth->size,
-                                           &peer_transmit_ready_cb,
-                                           cp);
-    GNUNET_assert (NULL != cp->cth);
-    GNUNET_assert (0 < cp->cth_in_progress--);
+    peer_transmit (cp);
   }
 }
 
@@ -602,9 +513,8 @@ ats_reserve_callback (void *cls,
  * @param cls handle to connected peer entry
  * @param record peerstore record information
  * @param emsg error message, or NULL if no errors
- * @return #GNUNET_NO to stop iterating since we only expect 0 or 1 records
  */
-static int
+static void
 peer_respect_cb (void *cls,
                  const struct GNUNET_PEERSTORE_Record *record,
                  const char *emsg)
@@ -612,13 +522,52 @@ peer_respect_cb (void *cls,
   struct GSF_ConnectedPeer *cp = cls;
 
   GNUNET_assert (NULL != cp->respect_iterate_req);
-  cp->respect_iterate_req = NULL;
-  if ((NULL != record) && (sizeof (cp->disk_respect) == record->value_size))
-    cp->disk_respect = cp->ppd.respect = *((uint32_t *)record->value);
+  if ( (NULL != record) &&
+       (sizeof (cp->disk_respect) == record->value_size))
+  {
+    cp->disk_respect = *((uint32_t *)record->value);
+    cp->ppd.respect += *((uint32_t *)record->value);
+  }
   GSF_push_start_ (cp);
-  if (NULL != cp->creation_cb)
-    cp->creation_cb (cp->creation_cb_cls, cp);
-  return GNUNET_NO;
+  if (NULL != record)
+    GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
+  cp->respect_iterate_req = NULL;
+}
+
+
+/**
+ * Function called for each pending request whenever a new
+ * peer connects, giving us a chance to decide about submitting
+ * the existing request to the new peer.
+ *
+ * @param cls the `struct GSF_ConnectedPeer` of the new peer
+ * @param key query for the request
+ * @param pr handle to the pending request
+ * @return #GNUNET_YES to continue to iterate
+ */
+static int
+consider_peer_for_forwarding (void *cls,
+                              const struct GNUNET_HashCode *key,
+                              struct GSF_PendingRequest *pr)
+{
+  struct GSF_ConnectedPeer *cp = cls;
+  struct GNUNET_PeerIdentity pid;
+
+  if (GNUNET_YES !=
+      GSF_pending_request_test_active_ (pr))
+    return GNUNET_YES; /* request is not actually active, skip! */
+  GSF_connected_peer_get_identity_ (cp, &pid);
+  if (GNUNET_YES !=
+      GSF_pending_request_test_target_ (pr, &pid))
+  {
+    GNUNET_STATISTICS_update (GSF_stats,
+                              gettext_noop ("# Loopback routes suppressed"),
+                              1,
+                              GNUNET_NO);
+    return GNUNET_YES;
+  }
+  GSF_plan_add_ (cp, pr);
+  return GNUNET_YES;
 }
 
 
@@ -626,43 +575,56 @@ peer_respect_cb (void *cls,
  * A peer connected to us.  Setup the connected peer
  * records.
  *
+ * @param cls NULL
  * @param peer identity of peer that connected
- * @param creation_cb callback function when the record is created.
- * @param creation_cb_cls closure for @creation_cb
+ * @param mq message queue for talking to @a peer
+ * @return our internal handle for the peer
  */
-void
-GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
-                           GSF_ConnectedPeerCreationCallback creation_cb,
-                           void *creation_cb_cls)
+void *
+GSF_peer_connect_handler (void *cls,
+                         const struct GNUNET_PeerIdentity *peer,
+                         struct GNUNET_MQ_Handle *mq)
 {
   struct GSF_ConnectedPeer *cp;
 
+  if (0 ==
+      GNUNET_memcmp (&GSF_my_id,
+                                       peer))
+    return NULL;
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Connected to peer %s\n",
               GNUNET_i2s (peer));
   cp = GNUNET_new (struct GSF_ConnectedPeer);
   cp->ppd.pid = GNUNET_PEER_intern (peer);
+  cp->ppd.peer = peer;
+  cp->mq = mq;
   cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
   cp->rc =
-      GNUNET_ATS_reserve_bandwidth (GSF_ats, peer, DBLOCK_SIZE,
+      GNUNET_ATS_reserve_bandwidth (GSF_ats,
+                                    peer,
+                                    DBLOCK_SIZE,
                                     &ats_reserve_callback, cp);
-  cp->request_map = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_NO);
+  cp->request_map = GNUNET_CONTAINER_multihashmap_create (128,
+                                                          GNUNET_YES);
   GNUNET_break (GNUNET_OK ==
                 GNUNET_CONTAINER_multipeermap_put (cp_map,
                GSF_connected_peer_get_identity2_ (cp),
                                                    cp,
                                                    GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
-  GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
+  GNUNET_STATISTICS_set (GSF_stats,
+                         gettext_noop ("# peers connected"),
                          GNUNET_CONTAINER_multipeermap_size (cp_map),
                          GNUNET_NO);
-  cp->creation_cb = creation_cb;
-  cp->creation_cb_cls = creation_cb_cls;
-  cp->respect_iterate_req =
-      GNUNET_PEERSTORE_iterate (peerstore, "fs",
-                                peer, "respect",
-                                GNUNET_TIME_UNIT_FOREVER_REL,
+  cp->respect_iterate_req 
+    = GNUNET_PEERSTORE_iterate (peerstore,
+                               "fs",
+                                peer,
+                               "respect",
                                 &peer_respect_cb,
                                 cp);
+  GSF_iterate_pending_requests_ (&consider_peer_for_forwarding,
+                                 cp);
+  return cp;
 }
 
 
@@ -671,11 +633,9 @@ GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
  * peer.  Check, and if so, restart migration.
  *
  * @param cls the `struct GSF_ConnectedPeer`
- * @param tc scheduler context
  */
 static void
-revive_migration (void *cls,
-                  const struct GNUNET_SCHEDULER_TaskContext *tc)
+revive_migration (void *cls)
 {
   struct GSF_ConnectedPeer *cp = cls;
   struct GNUNET_TIME_Relative bt;
@@ -709,38 +669,25 @@ GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
 
 
 /**
- * Handle P2P "MIGRATION_STOP" message.
+ * Handle P2P #GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP message. 
  *
- * @param cls closure, always NULL
- * @param other the other peer involved (sender or receiver, NULL
- *        for loopback messages where we are both sender and receiver)
- * @param message the actual message
- * @return #GNUNET_OK to keep the connection open,
- *         #GNUNET_SYSERR to close it (signal serious error)
+ * @param cls closure, the `struct GSF_ConnectedPeer`
+ * @param msm the actual message
  */
-int
-GSF_handle_p2p_migration_stop_ (void *cls,
-                                const struct GNUNET_PeerIdentity *other,
-                                const struct GNUNET_MessageHeader *message)
+void
+handle_p2p_migration_stop (void *cls,
+                          const struct MigrationStopMessage *msm)
 {
-  struct GSF_ConnectedPeer *cp;
-  const struct MigrationStopMessage *msm;
+  struct GSF_ConnectedPeer *cp = cls;
   struct GNUNET_TIME_Relative bt;
 
-  msm = (const struct MigrationStopMessage *) message;
-  cp = GSF_peer_get_ (other);
-  if (NULL == cp)
-  {
-    GNUNET_break (0);
-    return GNUNET_OK;
-  }
   GNUNET_STATISTICS_update (GSF_stats,
                             gettext_noop ("# migration stop messages received"),
                             1, GNUNET_NO);
   bt = GNUNET_TIME_relative_ntoh (msm->duration);
   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
               _("Migration of content to peer `%s' blocked for %s\n"),
-              GNUNET_i2s (other),
+              GNUNET_i2s (cp->ppd.peer),
              GNUNET_STRINGS_relative_time_to_string (bt, GNUNET_YES));
   cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
   if ( (NULL == cp->mig_revive_task) &&
@@ -751,46 +698,6 @@ GSF_handle_p2p_migration_stop_ (void *cls,
         GNUNET_SCHEDULER_add_delayed (bt,
                                       &revive_migration, cp);
   }
-  return GNUNET_OK;
-}
-
-
-/**
- * Copy reply and free put message.
- *
- * @param cls the `struct PutMessage`
- * @param buf_size number of bytes available in @a buf
- * @param buf where to copy the message, NULL on error (peer disconnect)
- * @return number of bytes copied to @a buf, can be 0 (without indicating an error)
- */
-static size_t
-copy_reply (void *cls,
-            size_t buf_size,
-            void *buf)
-{
-  struct PutMessage *pm = cls;
-  size_t size;
-
-  if (NULL != buf)
-  {
-    GNUNET_assert (buf_size >= ntohs (pm->header.size));
-    size = ntohs (pm->header.size);
-    memcpy (buf, pm, size);
-    GNUNET_STATISTICS_update (GSF_stats,
-                              gettext_noop ("# replies transmitted to other peers"),
-                              1,
-                              GNUNET_NO);
-  }
-  else
-  {
-    size = 0;
-    GNUNET_STATISTICS_update (GSF_stats,
-                              gettext_noop ("# replies dropped"),
-                              1,
-                              GNUNET_NO);
-  }
-  GNUNET_free (pm);
-  return size;
 }
 
 
@@ -798,24 +705,27 @@ copy_reply (void *cls,
  * Free resources associated with the given peer request.
  *
  * @param peerreq request to free
- * @param query associated key for the request
  */
 static void
-free_pending_request (struct PeerRequest *peerreq,
-                     const struct GNUNET_HashCode *query)
+free_pending_request (struct PeerRequest *peerreq)
 {
   struct GSF_ConnectedPeer *cp = peerreq->cp;
+  struct GSF_PendingRequestData *prd;
 
+  prd = GSF_pending_request_get_data_ (peerreq->pr);
   if (NULL != peerreq->kill_task)
   {
     GNUNET_SCHEDULER_cancel (peerreq->kill_task);
     peerreq->kill_task = NULL;
   }
-  GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
-                            -1, GNUNET_NO);
+  GNUNET_STATISTICS_update (GSF_stats,
+                            gettext_noop ("# P2P searches active"),
+                            -1,
+                            GNUNET_NO);
   GNUNET_break (GNUNET_YES ==
                 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
-                                                      query, peerreq));
+                                                      &prd->query,
+                                                      peerreq));
   GNUNET_free (peerreq);
 }
 
@@ -835,11 +745,10 @@ cancel_pending_request (void *cls,
 {
   struct PeerRequest *peerreq = value;
   struct GSF_PendingRequest *pr = peerreq->pr;
-  struct GSF_PendingRequestData *prd;
 
-  prd = GSF_pending_request_get_data_ (pr);
-  GSF_pending_request_cancel_ (pr, GNUNET_NO);
-  free_pending_request (peerreq, &prd->query);
+  free_pending_request (peerreq);
+  GSF_pending_request_cancel_ (pr,
+                               GNUNET_NO);
   return GNUNET_OK;
 }
 
@@ -848,11 +757,9 @@ cancel_pending_request (void *cls,
  * Free the given request.
  *
  * @param cls the request to free
- * @param tc task context
  */
 static void
-peer_request_destroy (void *cls,
-                      const struct GNUNET_SCHEDULER_TaskContext *tc)
+peer_request_destroy (void *cls)
 {
   struct PeerRequest *peerreq = cls;
   struct GSF_PendingRequest *pr = peerreq->pr;
@@ -860,7 +767,9 @@ peer_request_destroy (void *cls,
 
   peerreq->kill_task = NULL;
   prd = GSF_pending_request_get_data_ (pr);
-  cancel_pending_request (NULL, &prd->query, peerreq);
+  cancel_pending_request (NULL,
+                          &prd->query,
+                          peerreq);
 }
 
 
@@ -868,11 +777,9 @@ peer_request_destroy (void *cls,
  * The artificial delay is over, transmit the message now.
  *
  * @param cls the `struct GSF_DelayedHandle` with the message
- * @param tc scheduler context
  */
 static void
-transmit_delayed_now (void *cls,
-                      const struct GNUNET_SCHEDULER_TaskContext *tc)
+transmit_delayed_now (void *cls)
 {
   struct GSF_DelayedHandle *dh = cls;
   struct GSF_ConnectedPeer *cp = dh->cp;
@@ -881,19 +788,10 @@ transmit_delayed_now (void *cls,
                                cp->delayed_tail,
                                dh);
   cp->delay_queue_size--;
-  if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
-  {
-    GNUNET_free (dh->pm);
-    GNUNET_free (dh);
-    return;
-  }
-  (void) GSF_peer_transmit_ (cp,
-                             GNUNET_NO,
-                             UINT32_MAX,
-                             REPLY_TIMEOUT,
-                             dh->msize,
-                             &copy_reply,
-                             dh->pm);
+  GSF_peer_transmit_ (cp,
+                     GNUNET_NO,
+                     UINT32_MAX,
+                     dh->env);
   GNUNET_free (dh);
 }
 
@@ -955,16 +853,17 @@ handle_p2p_reply (void *cls,
   struct PeerRequest *peerreq = cls;
   struct GSF_ConnectedPeer *cp = peerreq->cp;
   struct GSF_PendingRequestData *prd;
+  struct GNUNET_MQ_Envelope *env;
   struct PutMessage *pm;
   size_t msize;
 
   GNUNET_assert (data_len + sizeof (struct PutMessage) <
-                 GNUNET_SERVER_MAX_MESSAGE_SIZE);
+                 GNUNET_MAX_MESSAGE_SIZE);
   GNUNET_assert (peerreq->pr == pr);
   prd = GSF_pending_request_get_data_ (pr);
   if (NULL == data)
   {
-    free_pending_request (peerreq, &prd->query);
+    free_pending_request (peerreq);
     return;
   }
   GNUNET_break (GNUNET_BLOCK_TYPE_ANY != type);
@@ -983,7 +882,7 @@ handle_p2p_reply (void *cls,
                             gettext_noop ("# replies received for other peers"),
                             1, GNUNET_NO);
   msize = sizeof (struct PutMessage) + data_len;
-  if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+  if (msize >= GNUNET_MAX_MESSAGE_SIZE)
   {
     GNUNET_break (0);
     return;
@@ -1001,12 +900,14 @@ handle_p2p_reply (void *cls,
     GSF_cover_content_count -= (reply_anonymity_level - 1);
   }
 
-  pm = GNUNET_malloc (msize);
-  pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
-  pm->header.size = htons (msize);
+  env = GNUNET_MQ_msg_extra (pm,
+                            data_len,
+                            GNUNET_MESSAGE_TYPE_FS_PUT);
   pm->type = htonl (type);
   pm->expiration = GNUNET_TIME_absolute_hton (expiration);
-  memcpy (&pm[1], data, data_len);
+  GNUNET_memcpy (&pm[1],
+                data,
+                data_len);
   if ( (UINT32_MAX != reply_anonymity_level) &&
        (0 != reply_anonymity_level) &&
        (GNUNET_YES == GSF_enable_randomized_delays) )
@@ -1015,7 +916,7 @@ handle_p2p_reply (void *cls,
 
     dh = GNUNET_new (struct GSF_DelayedHandle);
     dh->cp = cp;
-    dh->pm = pm;
+    dh->env = env;
     dh->msize = msize;
     GNUNET_CONTAINER_DLL_insert (cp->delayed_head,
                                  cp->delayed_tail,
@@ -1028,13 +929,10 @@ handle_p2p_reply (void *cls,
   }
   else
   {
-    (void) GSF_peer_transmit_ (cp,
-                               GNUNET_NO,
-                               UINT32_MAX,
-                               REPLY_TIMEOUT,
-                               msize,
-                               &copy_reply,
-                               pm);
+    GSF_peer_transmit_ (cp,
+                       GNUNET_NO,
+                       UINT32_MAX,
+                       env);
   }
   if (GNUNET_BLOCK_EVALUATION_OK_LAST != eval)
     return;
@@ -1043,9 +941,11 @@ handle_p2p_reply (void *cls,
     GNUNET_STATISTICS_update (GSF_stats,
                               gettext_noop
                               ("# P2P searches destroyed due to ultimate reply"),
-                              1, GNUNET_NO);
+                              1,
+                              GNUNET_NO);
     peerreq->kill_task =
-        GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
+        GNUNET_SCHEDULER_add_now (&peer_request_destroy,
+                                  peerreq);
   }
 }
 
@@ -1097,7 +997,8 @@ change_peer_respect (struct GSF_ConnectedPeer *cp, int value)
  * @return effective priority
  */
 static int32_t
-bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
+bound_priority (uint32_t prio_in,
+                struct GSF_ConnectedPeer *cp)
 {
 #define N ((double)128.0)
   uint32_t ret;
@@ -1159,11 +1060,12 @@ bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
  *
  * @param ttl_in requested ttl
  * @param prio given priority
- * @return ttl_in if ttl_in is below the limit,
- *         otherwise the ttl-limit for the given priority
+ * @return @a ttl_in if @a ttl_in is below the limit,
+ *         otherwise the ttl-limit for the given @a prio
  */
 static int32_t
-bound_ttl (int32_t ttl_in, uint32_t prio)
+bound_ttl (int32_t ttl_in,
+           uint32_t prio)
 {
   unsigned long long allowed;
 
@@ -1180,53 +1082,113 @@ bound_ttl (int32_t ttl_in, uint32_t prio)
 }
 
 
+/**
+ * Closure for #test_exist_cb().
+ */
+struct TestExistClosure
+{
+
+  /**
+   * Priority of the incoming request.
+   */
+  int32_t priority;
+
+  /**
+   * Relative TTL of the incoming request.
+   */
+  int32_t ttl;
+
+  /**
+   * Type of the incoming request.
+   */
+  enum GNUNET_BLOCK_Type type;
+
+  /**
+   * Set to #GNUNET_YES if we are done handling the query.
+   */
+  int finished;
+
+};
+
+
+/**
+ * Test if the query already exists.  If so, merge it, otherwise
+ * keep `finished` at #GNUNET_NO.
+ *
+ * @param cls our `struct TestExistClosure`
+ * @param hc the key of the query
+ * @param value the existing `struct PeerRequest`.
+ * @return #GNUNET_YES to continue to iterate,
+ *         #GNUNET_NO if we successfully merged
+ */
+static int
+test_exist_cb (void *cls,
+               const struct GNUNET_HashCode *hc,
+               void *value)
+{
+  struct TestExistClosure *tec = cls;
+  struct PeerRequest *peerreq = value;
+  struct GSF_PendingRequest *pr;
+  struct GSF_PendingRequestData *prd;
+
+  pr = peerreq->pr;
+  prd = GSF_pending_request_get_data_ (pr);
+  if (prd->type != tec->type)
+    return GNUNET_YES;
+  if (prd->ttl.abs_value_us >=
+      GNUNET_TIME_absolute_get ().abs_value_us + tec->ttl * 1000LL)
+  {
+    /* existing request has higher TTL, drop new one! */
+    prd->priority += tec->priority;
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "Have existing request with higher TTL, dropping new request.\n");
+    GNUNET_STATISTICS_update (GSF_stats,
+                              gettext_noop
+                              ("# requests dropped due to higher-TTL request"),
+                              1, GNUNET_NO);
+    tec->finished = GNUNET_YES;
+    return GNUNET_NO;
+  }
+  /* existing request has lower TTL, drop old one! */
+  tec->priority += prd->priority;
+  free_pending_request (peerreq);
+  GSF_pending_request_cancel_ (pr,
+                               GNUNET_YES);
+  return GNUNET_NO;
+}
+
+
 /**
  * Handle P2P "QUERY" message.  Creates the pending request entry
  * and sets up all of the data structures to that we will
  * process replies properly.  Does not initiate forwarding or
  * local database lookups.
  *
- * @param other the other peer involved (sender or receiver, NULL
- *        for loopback messages where we are both sender and receiver)
- * @param message the actual message
- * @return pending request handle, NULL on error
+ * @param cls the other peer involved (sender of the message)
+ * @param gm the GET message
  */
-struct GSF_PendingRequest *
-GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
-                       const struct GNUNET_MessageHeader *message)
+void
+handle_p2p_get (void *cls,
+               const struct GetMessage *gm)
 {
+  struct GSF_ConnectedPeer *cps = cls;
   struct PeerRequest *peerreq;
   struct GSF_PendingRequest *pr;
-  struct GSF_PendingRequestData *prd;
   struct GSF_ConnectedPeer *cp;
-  struct GSF_ConnectedPeer *cps;
   const struct GNUNET_PeerIdentity *target;
   enum GSF_PendingRequestOptions options;
   uint16_t msize;
-  const struct GetMessage *gm;
   unsigned int bits;
   const struct GNUNET_PeerIdentity *opt;
   uint32_t bm;
   size_t bfsize;
   uint32_t ttl_decrement;
-  int32_t priority;
-  int32_t ttl;
-  enum GNUNET_BLOCK_Type type;
+  struct TestExistClosure tec;
   GNUNET_PEER_Id spid;
+  const struct GSF_PendingRequestData *prd;
 
-  msize = ntohs (message->size);
-  if (msize < sizeof (struct GetMessage))
-  {
-    GNUNET_break_op (0);
-    return NULL;
-  }
-  GNUNET_STATISTICS_update (GSF_stats,
-                            gettext_noop
-                            ("# GET requests received (from other peers)"),
-                            1,
-                            GNUNET_NO);
-  gm = (const struct GetMessage *) message;
-  type = ntohl (gm->type);
+  msize = ntohs (gm->header.size);
+  tec.type = ntohl (gm->type);
   bm = ntohl (gm->hash_bitmap);
   bits = 0;
   while (bm > 0)
@@ -1235,32 +1197,16 @@ GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
       bits++;
     bm >>= 1;
   }
-  if (msize < sizeof (struct GetMessage) + bits * sizeof (struct GNUNET_PeerIdentity))
-  {
-    GNUNET_break_op (0);
-    return NULL;
-  }
   opt = (const struct GNUNET_PeerIdentity *) &gm[1];
   bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (struct GNUNET_PeerIdentity);
-  /* bfsize must be power of 2, check! */
-  if (0 != ((bfsize - 1) & bfsize))
-  {
-    GNUNET_break_op (0);
-    return NULL;
-  }
+  GNUNET_STATISTICS_update (GSF_stats,
+                            gettext_noop
+                            ("# GET requests received (from other peers)"),
+                            1,
+                            GNUNET_NO);
   GSF_cover_query_count++;
   bm = ntohl (gm->hash_bitmap);
   bits = 0;
-  cps = GSF_peer_get_ (other);
-  if (NULL == cps)
-  {
-    /* peer must have just disconnected */
-    GNUNET_STATISTICS_update (GSF_stats,
-                              gettext_noop
-                              ("# requests dropped due to initiator not being connected"),
-                              1, GNUNET_NO);
-    return NULL;
-  }
   if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
     cp = GSF_peer_get_ (&opt[bits++]);
   else
@@ -1275,112 +1221,98 @@ GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
     else
       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                   "Failed to find peer `%s' in connection set. Dropping query.\n",
-                  GNUNET_i2s (other));
+                  GNUNET_i2s (cps->ppd.peer));
     GNUNET_STATISTICS_update (GSF_stats,
                               gettext_noop
                               ("# requests dropped due to missing reverse route"),
                               1,
                               GNUNET_NO);
-    return NULL;
+    return;
   }
-  if (cp->ppd.pending_replies + cp->delay_queue_size > MAX_QUEUE_PER_PEER)
+  unsigned int queue_size = GNUNET_MQ_get_length (cp->mq);
+  queue_size += cp->ppd.pending_replies + cp->delay_queue_size;
+  if (queue_size > MAX_QUEUE_PER_PEER)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Peer `%s' has too many replies queued already. Dropping query.\n",
-                GNUNET_i2s (other));
+                GNUNET_i2s (cps->ppd.peer));
     GNUNET_STATISTICS_update (GSF_stats,
                               gettext_noop ("# requests dropped due to full reply queue"),
                               1,
                               GNUNET_NO);
-    return NULL;
+    return;
   }
   /* note that we can really only check load here since otherwise
    * peers could find out that we are overloaded by not being
    * disconnected after sending us a malformed query... */
-  priority = bound_priority (ntohl (gm->priority),
-                             cps);
-  if (priority < 0)
+  tec.priority = bound_priority (ntohl (gm->priority),
+                                 cps);
+  if (tec.priority < 0)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Dropping query from `%s', this peer is too busy.\n",
-                GNUNET_i2s (other));
-    return NULL;
+                GNUNET_i2s (cps->ppd.peer));
+    return;
   }
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Received request for `%s' of type %u from peer `%s' with flags %u\n",
               GNUNET_h2s (&gm->query),
-              (unsigned int) type,
-              GNUNET_i2s (other),
+              (unsigned int) tec.type,
+              GNUNET_i2s (cps->ppd.peer),
               (unsigned int) bm);
   target =
       (0 !=
        (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? (&opt[bits++]) : NULL;
   options = GSF_PRO_DEFAULTS;
   spid = 0;
-  if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
+  if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + tec.priority))
       || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
           GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value_us * 2 +
           GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
   {
     /* don't have BW to send to peer, or would likely take longer than we have for it,
      * so at best indirect the query */
-    priority = 0;
+    tec.priority = 0;
     options |= GSF_PRO_FORWARD_ONLY;
-    spid = GNUNET_PEER_intern (other);
+    spid = GNUNET_PEER_intern (cps->ppd.peer);
     GNUNET_assert (0 != spid);
   }
-  ttl = bound_ttl (ntohl (gm->ttl), priority);
+  tec.ttl = bound_ttl (ntohl (gm->ttl),
+                       tec.priority);
   /* decrement ttl (always) */
   ttl_decrement =
       2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
                                                     TTL_DECREMENT);
-  if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
+  if ( (tec.ttl < 0) &&
+       (((int32_t) (tec.ttl - ttl_decrement)) > 0) )
   {
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
-                GNUNET_i2s (other), ttl, ttl_decrement);
+                GNUNET_i2s (cps->ppd.peer),
+                tec.ttl,
+                ttl_decrement);
     GNUNET_STATISTICS_update (GSF_stats,
                               gettext_noop
                               ("# requests dropped due TTL underflow"), 1,
                               GNUNET_NO);
     /* integer underflow => drop (should be very rare)! */
-    return NULL;
+    return;
   }
-  ttl -= ttl_decrement;
+  tec.ttl -= ttl_decrement;
 
   /* test if the request already exists */
-  peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map,
-                                               &gm->query);
-  if (NULL != peerreq)
-  {
-    pr = peerreq->pr;
-    prd = GSF_pending_request_get_data_ (pr);
-    if (prd->type == type)
-    {
-      if (prd->ttl.abs_value_us >= GNUNET_TIME_absolute_get ().abs_value_us + ttl * 1000LL)
-      {
-        /* existing request has higher TTL, drop new one! */
-        prd->priority += priority;
-        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-                    "Have existing request with higher TTL, dropping new request.\n",
-                    GNUNET_i2s (other));
-        GNUNET_STATISTICS_update (GSF_stats,
-                                  gettext_noop
-                                  ("# requests dropped due to higher-TTL request"),
-                                  1, GNUNET_NO);
-        return NULL;
-      }
-      /* existing request has lower TTL, drop old one! */
-      priority += prd->priority;
-      GSF_pending_request_cancel_ (pr, GNUNET_YES);
-      free_pending_request (peerreq, &gm->query);
-    }
-  }
+  tec.finished = GNUNET_NO;
+  GNUNET_CONTAINER_multihashmap_get_multiple (cp->request_map,
+                                              &gm->query,
+                                              &test_exist_cb,
+                                              &tec);
+  if (GNUNET_YES == tec.finished)
+    return; /* merged into existing request, we're done */
 
   peerreq = GNUNET_new (struct PeerRequest);
   peerreq->cp = cp;
   pr = GSF_pending_request_create_ (options,
-                                    type,
+                                    tec.type,
                                     &gm->query,
                                     target,
                                     (bfsize > 0)
@@ -1389,62 +1321,33 @@ GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
                                     bfsize,
                                     ntohl (gm->filter_mutator),
                                     1 /* anonymity */,
-                                    (uint32_t) priority,
-                                    ttl,
+                                    (uint32_t) tec.priority,
+                                    tec.ttl,
                                     spid,
-                                    GNUNET_PEER_intern (other),
+                                    GNUNET_PEER_intern (cps->ppd.peer),
                                     NULL, 0,        /* replies_seen */
-                                    &handle_p2p_reply, peerreq);
+                                    &handle_p2p_reply,
+                                    peerreq);
   GNUNET_assert (NULL != pr);
+  prd = GSF_pending_request_get_data_ (pr);
   peerreq->pr = pr;
   GNUNET_break (GNUNET_OK ==
-                GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
+                GNUNET_CONTAINER_multihashmap_put (cp->request_map,
+                                                   &prd->query,
                                                    peerreq,
                                                    GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
   GNUNET_STATISTICS_update (GSF_stats,
-                            gettext_noop
-                            ("# P2P query messages received and processed"), 1,
+                            gettext_noop ("# P2P query messages received and processed"),
+                            1,
                             GNUNET_NO);
-  GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
-                            1, GNUNET_NO);
-  return pr;
-}
-
-
-/**
- * Function called if there has been a timeout trying to satisfy
- * a transmission request.
- *
- * @param cls the `struct GSF_PeerTransmitHandle` of the request
- * @param tc scheduler context
- */
-static void
-peer_transmit_timeout (void *cls,
-                       const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
-  struct GSF_PeerTransmitHandle *pth = cls;
-  struct GSF_ConnectedPeer *cp;
-
-  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-              "Timeout trying to transmit to other peer\n");
-  pth->timeout_task = NULL;
-  cp = pth->cp;
-  GNUNET_CONTAINER_DLL_remove (cp->pth_head,
-                               cp->pth_tail,
-                               pth);
-  if (GNUNET_YES == pth->is_query)
-    GNUNET_assert (0 < cp->ppd.pending_queries--);
-  else if (GNUNET_NO == pth->is_query)
-    GNUNET_assert (0 < cp->ppd.pending_replies--);
-  GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
-  if (NULL != cp->cth)
-  {
-    GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
-    cp->cth = NULL;
-  }
-  pth->gmc (pth->gmc_cls, 0, NULL);
-  GNUNET_assert (0 == cp->cth_in_progress);
-  GNUNET_free (pth);
+  GNUNET_STATISTICS_update (GSF_stats,
+                            gettext_noop ("# P2P searches active"),
+                            1,
+                            GNUNET_NO);
+  GSF_pending_request_get_data_ (pr)->has_started = GNUNET_YES;
+  GSF_local_lookup_ (pr,
+                     &GSF_consider_forwarding,
+                     NULL);
 }
 
 
@@ -1456,19 +1359,15 @@ peer_transmit_timeout (void *cls,
  * @param cp target peer
  * @param is_query is this a query (#GNUNET_YES) or content (#GNUNET_NO) or neither (#GNUNET_SYSERR)
  * @param priority how important is this request?
- * @param timeout when does this request timeout (call gmc with error)
+ * @param timeout when does this request timeout 
  * @param size number of bytes we would like to send to the peer
- * @param gmc function to call to get the message
- * @param gmc_cls closure for @a gmc
- * @return handle to cancel request
+ * @param env message to send
  */
-struct GSF_PeerTransmitHandle *
+void
 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
                     int is_query,
                     uint32_t priority,
-                    struct GNUNET_TIME_Relative timeout,
-                    size_t size,
-                    GSF_GetMessageCallback gmc, void *gmc_cls)
+                    struct GNUNET_MQ_Envelope *env)
 {
   struct GSF_PeerTransmitHandle *pth;
   struct GSF_PeerTransmitHandle *pos;
@@ -1476,10 +1375,7 @@ GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
 
   pth = GNUNET_new (struct GSF_PeerTransmitHandle);
   pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
-  pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
-  pth->gmc = gmc;
-  pth->gmc_cls = gmc_cls;
-  pth->size = size;
+  pth->env = env;
   pth->is_query = is_query;
   pth->priority = priority;
   pth->cp = cp;
@@ -1499,39 +1395,7 @@ GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp,
     cp->ppd.pending_queries++;
   else if (GNUNET_NO == is_query)
     cp->ppd.pending_replies++;
-  pth->timeout_task
-    = GNUNET_SCHEDULER_add_delayed (timeout,
-                                    &peer_transmit_timeout,
-                                    pth);
   schedule_transmission (pth);
-  return pth;
-}
-
-
-/**
- * Cancel an earlier request for transmission.
- *
- * @param pth request to cancel
- */
-void
-GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
-{
-  struct GSF_ConnectedPeer *cp;
-
-  if (NULL != pth->timeout_task)
-  {
-    GNUNET_SCHEDULER_cancel (pth->timeout_task);
-    pth->timeout_task = NULL;
-  }
-  cp = pth->cp;
-  GNUNET_CONTAINER_DLL_remove (cp->pth_head,
-                               cp->pth_tail,
-                               pth);
-  if (GNUNET_YES == pth->is_query)
-    GNUNET_assert (0 < cp->ppd.pending_queries--);
-  else if (GNUNET_NO == pth->is_query)
-    GNUNET_assert (0 < cp->ppd.pending_replies--);
-  GNUNET_free (pth);
 }
 
 
@@ -1619,7 +1483,9 @@ flush_respect (void *cls,
   GNUNET_PEERSTORE_store (peerstore, "fs", &pid, "respect", &cp->ppd.respect,
                           sizeof (cp->ppd.respect),
                           GNUNET_TIME_UNIT_FOREVER_ABS,
-                          GNUNET_PEERSTORE_STOREOPTION_REPLACE, NULL, NULL);
+                          GNUNET_PEERSTORE_STOREOPTION_REPLACE,
+                         NULL,
+                         NULL);
   return GNUNET_OK;
 }
 
@@ -1629,26 +1495,30 @@ flush_respect (void *cls,
  * record.
  *
  * @param cls unused
- * @param peer identity of peer that connected
+ * @param peer identity of peer that disconnected
+ * @param internal_cls the corresponding `struct GSF_ConnectedPeer`
  */
 void
-GSF_peer_disconnect_handler_ (void *cls,
-                              const struct GNUNET_PeerIdentity *peer)
+GSF_peer_disconnect_handler (void *cls,
+                            const struct GNUNET_PeerIdentity *peer,
+                            void *internal_cls)
 {
-  struct GSF_ConnectedPeer *cp;
+  struct GSF_ConnectedPeer *cp = internal_cls;
   struct GSF_PeerTransmitHandle *pth;
   struct GSF_DelayedHandle *dh;
 
-  cp = GSF_peer_get_ (peer);
   if (NULL == cp)
-    return;                     /* must have been disconnect from core with
-                                 * 'peer' == my_id, ignore */
-  flush_respect (NULL, peer, cp);
+    return;  /* must have been disconnect from core with
+             * 'peer' == my_id, ignore */
+  flush_respect (NULL,
+                peer,
+                cp);
   GNUNET_assert (GNUNET_YES ==
                  GNUNET_CONTAINER_multipeermap_remove (cp_map,
                                                        peer,
                                                       cp));
-  GNUNET_STATISTICS_set (GSF_stats, gettext_noop ("# peers connected"),
+  GNUNET_STATISTICS_set (GSF_stats,
+                        gettext_noop ("# peers connected"),
                          GNUNET_CONTAINER_multipeermap_size (cp_map),
                          GNUNET_NO);
   if (NULL != cp->respect_iterate_req)
@@ -1656,11 +1526,6 @@ GSF_peer_disconnect_handler_ (void *cls,
     GNUNET_PEERSTORE_iterate_cancel (cp->respect_iterate_req);
     cp->respect_iterate_req = NULL;
   }
-  if (NULL != cp->migration_pth)
-  {
-    GSF_peer_transmit_cancel_ (cp->migration_pth);
-    cp->migration_pth = NULL;
-  }
   if (NULL != cp->rc)
   {
     GNUNET_ATS_reserve_bandwidth_cancel (cp->rc);
@@ -1672,27 +1537,20 @@ GSF_peer_disconnect_handler_ (void *cls,
     cp->rc_delay_task = NULL;
   }
   GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
-                                         &cancel_pending_request, cp);
+                                         &cancel_pending_request,
+                                         cp);
   GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
   cp->request_map = NULL;
   GSF_plan_notify_peer_disconnect_ (cp);
   GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
-  GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
-  memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
+  GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies,
+                             P2P_SUCCESS_LIST_SIZE);
+  memset (cp->ppd.last_p2p_replies,
+          0,
+          sizeof (cp->ppd.last_p2p_replies));
   GSF_push_stop_ (cp);
-  if (NULL != cp->cth)
-  {
-    GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
-    cp->cth = NULL;
-  }
-  GNUNET_assert (0 == cp->cth_in_progress);
   while (NULL != (pth = cp->pth_head))
   {
-    if (pth->timeout_task != NULL)
-    {
-      GNUNET_SCHEDULER_cancel (pth->timeout_task);
-      pth->timeout_task = NULL;
-    }
     GNUNET_CONTAINER_DLL_remove (cp->pth_head,
                                  cp->pth_tail,
                                  pth);
@@ -1700,7 +1558,6 @@ GSF_peer_disconnect_handler_ (void *cls,
       GNUNET_assert (0 < cp->ppd.pending_queries--);
     else if (GNUNET_NO == pth->is_query)
       GNUNET_assert (0 < cp->ppd.pending_replies--);
-    pth->gmc (pth->gmc_cls, 0, NULL);
     GNUNET_free (pth);
   }
   while (NULL != (dh = cp->delayed_head))
@@ -1708,9 +1565,9 @@ GSF_peer_disconnect_handler_ (void *cls,
     GNUNET_CONTAINER_DLL_remove (cp->delayed_head,
                                  cp->delayed_tail,
                                  dh);
+    GNUNET_MQ_discard (dh->env);
     cp->delay_queue_size--;
     GNUNET_SCHEDULER_cancel (dh->delay_task);
-    GNUNET_free (dh->pm);
     GNUNET_free (dh);
   }
   GNUNET_PEER_change_rc (cp->ppd.pid, -1);
@@ -1814,40 +1671,6 @@ GSF_connected_peer_get_identity2_ (const struct GSF_ConnectedPeer *cp)
 }
 
 
-/**
- * Assemble a migration stop message for transmission.
- *
- * @param cls the `struct GSF_ConnectedPeer` to use
- * @param size number of bytes we're allowed to write to @a buf
- * @param buf where to copy the message
- * @return number of bytes copied to @a buf
- */
-static size_t
-create_migration_stop_message (void *cls,
-                               size_t size,
-                               void *buf)
-{
-  struct GSF_ConnectedPeer *cp = cls;
-  struct MigrationStopMessage msm;
-
-  cp->migration_pth = NULL;
-  if (NULL == buf)
-    return 0;
-  GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
-  msm.header.size = htons (sizeof (struct MigrationStopMessage));
-  msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
-  msm.reserved = htonl (0);
-  msm.duration =
-      GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
-                                 (cp->last_migration_block));
-  memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
-  GNUNET_STATISTICS_update (GSF_stats,
-                            gettext_noop ("# migration stop messages sent"),
-                            1, GNUNET_NO);
-  return sizeof (struct MigrationStopMessage);
-}
-
-
 /**
  * Ask a peer to stop migrating data to us until the given point
  * in time.
@@ -1859,6 +1682,9 @@ void
 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
                            struct GNUNET_TIME_Absolute block_time)
 {
+  struct GNUNET_MQ_Envelope *env;
+  struct MigrationStopMessage *msm;
+  
   if (cp->last_migration_block.abs_value_us > block_time.abs_value_us)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
@@ -1871,13 +1697,20 @@ GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
               GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (block_time),
                                                      GNUNET_YES));
   cp->last_migration_block = block_time;
-  if (NULL != cp->migration_pth)
-    GSF_peer_transmit_cancel_ (cp->migration_pth);
-  cp->migration_pth =
-      GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
-                          GNUNET_TIME_UNIT_FOREVER_REL,
-                          sizeof (struct MigrationStopMessage),
-                          &create_migration_stop_message, cp);
+  env = GNUNET_MQ_msg (msm,
+                      GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
+  msm->reserved = htonl (0);
+  msm->duration
+    = GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
+                                (cp->last_migration_block));
+  GNUNET_STATISTICS_update (GSF_stats,
+                            gettext_noop ("# migration stop messages sent"),
+                            1,
+                           GNUNET_NO);
+  GSF_peer_transmit_ (cp,
+                     GNUNET_SYSERR,
+                     UINT32_MAX,
+                     env);
 }
 
 
@@ -1902,23 +1735,17 @@ GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
  * Call this method periodically to flush respect information to disk.
  *
  * @param cls closure, not used
- * @param tc task context, not used
  */
 static void
-cron_flush_respect (void *cls,
-                    const struct GNUNET_SCHEDULER_TaskContext *tc)
+cron_flush_respect (void *cls)
 {
-  if (NULL == cp_map)
-    return;
+  fr_task = NULL;
   GNUNET_CONTAINER_multipeermap_iterate (cp_map,
-                                         &flush_respect, NULL);
-  if (NULL == tc)
-    return;
-  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
-    return;
-  GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
-                                             GNUNET_SCHEDULER_PRIORITY_HIGH,
-                                             &cron_flush_respect, NULL);
+                                         &flush_respect,
+                                        NULL);
+  fr_task = GNUNET_SCHEDULER_add_delayed_with_priority (RESPECT_FLUSH_FREQ,
+                                                       GNUNET_SCHEDULER_PRIORITY_HIGH,
+                                                       &cron_flush_respect, NULL);
 }
 
 
@@ -1930,26 +1757,8 @@ GSF_connected_peer_init_ ()
 {
   cp_map = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
   peerstore = GNUNET_PEERSTORE_connect (GSF_cfg);
-  GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
-                                      &cron_flush_respect, NULL);
-}
-
-
-/**
- * Iterator to free peer entries.
- *
- * @param cls closure, unused
- * @param key current key code
- * @param value value in the hash map (peer entry)
- * @return #GNUNET_YES (we should continue to iterate)
- */
-static int
-clean_peer (void *cls,
-           const struct GNUNET_PeerIdentity *key,
-           void *value)
-{
-  GSF_peer_disconnect_handler_ (NULL, key);
-  return GNUNET_YES;
+  fr_task = GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
+                                               &cron_flush_respect, NULL);
 }
 
 
@@ -1959,12 +1768,16 @@ clean_peer (void *cls,
 void
 GSF_connected_peer_done_ ()
 {
-  cron_flush_respect (NULL, NULL);
   GNUNET_CONTAINER_multipeermap_iterate (cp_map,
-                                         &clean_peer, NULL);
+                                         &flush_respect,
+                                         NULL);
+  GNUNET_SCHEDULER_cancel (fr_task);
+  fr_task = NULL;
   GNUNET_CONTAINER_multipeermap_destroy (cp_map);
   cp_map = NULL;
-  GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_YES);
+  GNUNET_PEERSTORE_disconnect (peerstore,
+                              GNUNET_YES);
+  
 }
 
 
@@ -2003,7 +1816,8 @@ GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
 {
   if (NULL == cp_map)
     return;                     /* already cleaned up */
-  GNUNET_CONTAINER_multipeermap_iterate (cp_map, &clean_local_client,
+  GNUNET_CONTAINER_multipeermap_iterate (cp_map,
+                                        &clean_local_client,
                                          (void *) lc);
 }