-
/*
This file is part of GNUnet.
Copyright (C) 2001-2017 GNUnet e.V.
* end-to-end routes and transmits messages along the route
* @author Bartlomiej Polot
* @author Christian Grothoff
- *
- * TODO:
- * - Implement: keepalive messages / timeout (timeout to be done @ peer level!)
- * - Optimization: keep performance metrics (?)
*/
#include "platform.h"
#include "gnunet-service-cadet-new.h"
*/
struct GNUNET_TIME_Relative retry_delay;
+ /**
+ * Performance metrics for this connection.
+ */
+ struct CadetConnectionMetrics metrics;
+
/**
* State of the connection.
*/
enum CadetConnectionState state;
+ /**
+ * Options for the route, control buffering.
+ */
+ enum GNUNET_CADET_ChannelOption options;
+
+ /**
+ * How many latency observations did we make for this connection?
+ */
+ unsigned int latency_datapoints;
+
/**
* Offset of our @e destination in @e path.
*/
/**
- * Destroy a connection.
+ * Lookup a connection by its identifier.
+ *
+ * @param cid identifier to resolve
+ * @return NULL if connection was not found
+ */
+struct CadetConnection *
+GCC_lookup (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
+{
+ return GNUNET_CONTAINER_multishortmap_get (connections,
+ &cid->connection_of_tunnel);
+}
+
+
+/**
+ * Update the connection state. Also triggers the necessary
+ * MQM notifications.
+ *
+ * @param cc connection to update the state for
+ * @param new_state new state for @a cc
+ * @param new_mqm_ready new `mqm_ready` state for @a cc
+ */
+static void
+update_state (struct CadetConnection *cc,
+ enum CadetConnectionState new_state,
+ int new_mqm_ready)
+{
+ int old_ready;
+ int new_ready;
+
+ if ( (new_state == cc->state) &&
+ (new_mqm_ready == cc->mqm_ready) )
+ return; /* no change, nothing to do */
+ old_ready = ( (CADET_CONNECTION_READY == cc->state) &&
+ (GNUNET_YES == cc->mqm_ready) );
+ new_ready = ( (CADET_CONNECTION_READY == new_state) &&
+ (GNUNET_YES == new_mqm_ready) );
+ cc->state = new_state;
+ cc->mqm_ready = new_mqm_ready;
+ if (old_ready != new_ready)
+ cc->ready_cb (cc->ready_cb_cls,
+ new_ready);
+}
+
+
+/**
+ * Destroy a connection, part of the internal implementation. Called
+ * only from #GCC_destroy_from_core() or #GCC_destroy_from_tunnel().
*
* @param cc connection to destroy
*/
-void
+static void
GCC_destroy (struct CadetConnection *cc)
{
- struct GNUNET_MQ_Envelope *env = NULL;
-
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Destroying %s\n",
GCC_2s (cc));
- if (CADET_CONNECTION_SENDING_CREATE != cc->state)
- {
- struct GNUNET_CADET_ConnectionDestroyMessage *destroy_msg;
-
- /* Need to notify next hop that we are down. */
- env = GNUNET_MQ_msg (destroy_msg,
- GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY);
- destroy_msg->cid = cc->cid;
- }
if (NULL != cc->mq_man)
{
GCP_request_mq_cancel (cc->mq_man,
- env);
+ NULL);
cc->mq_man = NULL;
}
if (NULL != cc->task)
GCPP_del_connection (cc->path,
cc->off,
cc);
+ for (unsigned int i=0;i<cc->off;i++)
+ GCP_remove_connection (GCPP_get_peer_at_offset (cc->path,
+ i),
+ cc);
GNUNET_assert (GNUNET_YES ==
GNUNET_CONTAINER_multishortmap_remove (connections,
&GCC_get_id (cc)->connection_of_tunnel,
}
+
+/**
+ * Destroy a connection, called when the CORE layer is already done
+ * (i.e. has received a BROKEN message), but if we still have to
+ * communicate the destruction of the connection to the tunnel (if one
+ * exists).
+ *
+ * @param cc connection to destroy
+ */
+void
+GCC_destroy_without_core (struct CadetConnection *cc)
+{
+ if (NULL != cc->ct)
+ {
+ GCT_connection_lost (cc->ct);
+ cc->ct = NULL;
+ }
+ GCC_destroy (cc);
+}
+
+
+/**
+ * Destroy a connection, called if the tunnel association with the
+ * connection was already broken, but we still need to notify the CORE
+ * layer about the breakage.
+ *
+ * @param cc connection to destroy
+ */
+void
+GCC_destroy_without_tunnel (struct CadetConnection *cc)
+{
+ cc->ct = NULL;
+ if ( (CADET_CONNECTION_SENDING_CREATE != cc->state) &&
+ (NULL != cc->mq_man) )
+ {
+ struct GNUNET_MQ_Envelope *env;
+ struct GNUNET_CADET_ConnectionDestroyMessage *destroy_msg;
+
+ /* Need to notify next hop that we are down. */
+ env = GNUNET_MQ_msg (destroy_msg,
+ GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY);
+ destroy_msg->cid = cc->cid;
+ GCP_request_mq_cancel (cc->mq_man,
+ env);
+ cc->mq_man = NULL;
+ }
+ GCC_destroy (cc);
+}
+
+
/**
* Return the tunnel associated with this connection.
*
}
+/**
+ * Obtain performance @a metrics from @a cc.
+ *
+ * @param cc connection to query
+ * @return the metrics
+ */
+const struct CadetConnectionMetrics *
+GCC_get_metrics (struct CadetConnection *cc)
+{
+ return &cc->metrics;
+}
+
+
/**
* Send a #GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE through the
* tunnel to prevent it from timing out.
* schedule the next one.
*
* @param cls the `struct CadetConnection` to keep alive.
+ * @param cid identifier of the connection within the tunnel, NULL
+ * if transmission failed
*/
static void
-keepalive_done (void *cls)
+keepalive_done (void *cls,
+ const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
{
struct CadetConnection *cc = cls;
struct GNUNET_MessageHeader msg;
cc->task = NULL;
+ if (CADET_TUNNEL_KEY_OK != GCT_get_estate (cc->ct->t))
+ {
+ /* Tunnel not yet ready, wait with keepalives... */
+ cc->task = GNUNET_SCHEDULER_add_delayed (keepalive_period,
+ &send_keepalive,
+ cc);
+ return;
+ }
GNUNET_assert (NULL != cc->ct);
GNUNET_assert (GNUNET_YES == cc->mqm_ready);
GNUNET_assert (NULL == cc->keepalive_qe);
}
+/**
+ * We sent a message for which we expect to receive an ACK via
+ * the connection identified by @a cti.
+ *
+ * @param cid connection identifier where we expect an ACK
+ */
+void
+GCC_ack_expected (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
+{
+ struct CadetConnection *cc;
+
+ cc = GCC_lookup (cid);
+ if (NULL == cc)
+ return; /* whopise, connection alredy down? */
+ cc->metrics.num_acked_transmissions++;
+}
+
+
+/**
+ * We observed an ACK for a message that was originally sent via
+ * the connection identified by @a cti.
+ *
+ * @param cti connection identifier where we got an ACK for a message
+ * that was originally sent via this connection (the ACK
+ * may have gotten back to us via a different connection).
+ */
+void
+GCC_ack_observed (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
+{
+ struct CadetConnection *cc;
+
+ cc = GCC_lookup (cid);
+ if (NULL == cc)
+ return; /* whopise, connection alredy down? */
+ cc->metrics.num_successes++;
+}
+
+
+/**
+ * We observed some the given @a latency on the connection
+ * identified by @a cti. (The same connection was taken
+ * in both directions.)
+ *
+ * @param cid connection identifier where we measured latency
+ * @param latency the observed latency
+ */
+void
+GCC_latency_observed (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid,
+ struct GNUNET_TIME_Relative latency)
+{
+ struct CadetConnection *cc;
+ double weight;
+ double result;
+
+ cc = GCC_lookup (cid);
+ if (NULL == cc)
+ return; /* whopise, connection alredy down? */
+ GNUNET_STATISTICS_update (stats,
+ "# latencies observed",
+ 1,
+ GNUNET_NO);
+ cc->latency_datapoints++;
+ if (cc->latency_datapoints >= 7)
+ weight = 7.0;
+ else
+ weight = cc->latency_datapoints;
+ /* Compute weighted average, giving at MOST weight 7 to the
+ existing values, or less if that value is based on fewer than 7
+ measurements. */
+ result = (weight * cc->metrics.aged_latency.rel_value_us) + 1.0 * latency.rel_value_us;
+ result /= (weight + 1.0);
+ cc->metrics.aged_latency.rel_value_us = (uint64_t) result;
+}
+
+
/**
* A #GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK was received for this connection, implying
* that the end-to-end connection is up. Process it.
GCC_2s (cc),
cc->state,
(GNUNET_YES == cc->mqm_ready) ? "MQM ready" : "MQM busy");
+ if (CADET_CONNECTION_READY == cc->state)
+ return; /* Duplicate ACK, ignore */
if (NULL != cc->task)
{
GNUNET_SCHEDULER_cancel (cc->task);
cc->task = NULL;
}
- cc->state = CADET_CONNECTION_READY;
- if (GNUNET_YES == cc->mqm_ready)
- {
- cc->ready_cb (cc->ready_cb_cls,
- GNUNET_YES);
- if ( (NULL == cc->keepalive_qe) &&
- (GNUNET_YES == cc->mqm_ready) &&
- (NULL == cc->task) )
- cc->task = GNUNET_SCHEDULER_add_delayed (keepalive_period,
- &send_keepalive,
- cc);
- }
+ cc->metrics.age = GNUNET_TIME_absolute_get ();
+ update_state (cc,
+ CADET_CONNECTION_READY,
+ cc->mqm_ready);
+ if ( (NULL == cc->keepalive_qe) &&
+ (GNUNET_YES == cc->mqm_ready) &&
+ (NULL == cc->task) )
+ cc->task = GNUNET_SCHEDULER_add_delayed (keepalive_period,
+ &send_keepalive,
+ cc);
}
}
+/**
+ * Handle KX_AUTH message.
+ *
+ * @param cc connection that received encrypted message
+ * @param msg the key exchange message
+ */
+void
+GCC_handle_kx_auth (struct CadetConnection *cc,
+ const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage *msg)
+{
+ if (CADET_CONNECTION_SENT == cc->state)
+ {
+ /* We didn't get the CADET_CONNECTION_CREATE_ACK, but instead got payload. That's fine,
+ clearly something is working, so pretend we got an ACK. */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Faking connection CADET_CONNECTION_CREATE_ACK for %s due to KX\n",
+ GCC_2s (cc));
+ GCC_handle_connection_create_ack (cc);
+ }
+ GCT_handle_kx_auth (cc->ct,
+ msg);
+}
+
+
/**
* Handle encrypted message.
*
GCC_2s (cc));
GCC_handle_connection_create_ack (cc);
}
+ cc->metrics.last_use = GNUNET_TIME_absolute_get ();
GCT_handle_encrypted (cc->ct,
msg);
}
env = GNUNET_MQ_msg_extra (create_msg,
(1 + path_length) * sizeof (struct GNUNET_PeerIdentity),
GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
+ create_msg->options = htonl ((uint32_t) cc->options);
create_msg->cid = cc->cid;
pids = (struct GNUNET_PeerIdentity *) &create_msg[1];
pids[0] = my_full_id;
"Sending CADET_CONNECTION_CREATE message for %s\n",
GCC_2s (cc));
cc->env = env;
- cc->mqm_ready = GNUNET_NO;
- cc->state = CADET_CONNECTION_SENT;
+ update_state (cc,
+ CADET_CONNECTION_SENT,
+ GNUNET_NO);
GCP_send (cc->mq_man,
env);
}
GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK);
ack_msg->cid = cc->cid;
cc->env = env;
- cc->mqm_ready = GNUNET_NO;
- cc->state = CADET_CONNECTION_READY;
+ update_state (cc,
+ CADET_CONNECTION_READY,
+ GNUNET_NO);
GCP_send (cc->mq_man,
env);
}
"Got duplicate CREATE for %s, scheduling another ACK (%s)\n",
GCC_2s (cc),
(GNUNET_YES == cc->mqm_ready) ? "MQM ready" : "MQM busy");
- /* Tell tunnel that we are not ready for transmission anymore
- (until CREATE_ACK is done) */
- cc->ready_cb (cc->ready_cb_cls,
- GNUNET_NO);
/* Revert back to the state of having only received the 'CREATE',
and immediately proceed to send the CREATE_ACK. */
- cc->state = CADET_CONNECTION_CREATE_RECEIVED;
+ update_state (cc,
+ CADET_CONNECTION_CREATE_RECEIVED,
+ cc->mqm_ready);
if (NULL != cc->task)
GNUNET_SCHEDULER_cancel (cc->task);
cc->task = GNUNET_SCHEDULER_add_now (&send_create_ack,
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Core MQ for %s went down\n",
GCC_2s (cc));
- cc->mqm_ready = GNUNET_NO;
- cc->state = CADET_CONNECTION_NEW;
+ update_state (cc,
+ CADET_CONNECTION_NEW,
+ GNUNET_NO);
cc->retry_delay = GNUNET_TIME_UNIT_ZERO;
if (NULL != cc->task)
{
GNUNET_SCHEDULER_cancel (cc->task);
cc->task = NULL;
}
- cc->ready_cb (cc->ready_cb_cls,
- GNUNET_NO);
return;
}
- cc->mqm_ready = GNUNET_YES;
+ update_state (cc,
+ cc->state,
+ GNUNET_YES);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Core MQ for %s became available in state %d\n",
GCC_2s (cc),
break;
case CADET_CONNECTION_CREATE_RECEIVED:
/* We got the 'CREATE' (incoming connection), should send the CREATE_ACK */
+ cc->metrics.age = GNUNET_TIME_absolute_get ();
cc->task = GNUNET_SCHEDULER_add_now (&send_create_ack,
cc);
break;
case CADET_CONNECTION_READY:
- cc->ready_cb (cc->ready_cb_cls,
- GNUNET_YES);
if ( (NULL == cc->keepalive_qe) &&
(GNUNET_YES == cc->mqm_ready) &&
(NULL == cc->task) )
*
* @param destination where to go
* @param path which path to take (may not be the full path)
+ * @param off offset of @a destination on @a path
+ * @param options options for the connection
* @param ct which tunnel uses this connection
* @param init_state initial state for the connection
* @param ready_cb function to call when ready to transmit
static struct CadetConnection *
connection_create (struct CadetPeer *destination,
struct CadetPeerPath *path,
+ unsigned int off,
+ enum GNUNET_CADET_ChannelOption options,
struct CadetTConnection *ct,
const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid,
enum CadetConnectionState init_state,
{
struct CadetConnection *cc;
struct CadetPeer *first_hop;
- unsigned int off;
- off = GCPP_find_peer (path,
- destination);
- GNUNET_assert (UINT_MAX > off);
cc = GNUNET_new (struct CadetConnection);
+ cc->options = options;
cc->state = init_state;
cc->ct = ct;
cc->cid = *cid;
cc);
for (unsigned int i=0;i<off;i++)
GCP_add_connection (GCPP_get_peer_at_offset (path,
- off),
+ i),
cc);
first_hop = GCPP_get_peer_at_offset (path,
*
* @param destination where to go
* @param path which path to take (may not be the full path)
+ * @param options options for the connection
* @param ct which tunnel uses this connection
* @param ready_cb function to call when ready to transmit
* @param ready_cb_cls closure for @a cb
- * @return handle to the connection
+ * @return handle to the connection, NULL if we already have
+ * a connection that takes precedence on @a path
*/
struct CadetConnection *
GCC_create_inbound (struct CadetPeer *destination,
struct CadetPeerPath *path,
+ enum GNUNET_CADET_ChannelOption options,
struct CadetTConnection *ct,
const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid,
GCC_ReadyCallback ready_cb,
void *ready_cb_cls)
{
+ struct CadetConnection *cc;
+ unsigned int off;
+
+ off = GCPP_find_peer (path,
+ destination);
+ GNUNET_assert (UINT_MAX != off);
+ cc = GCPP_get_connection (path,
+ destination,
+ off);
+ if (NULL != cc)
+ {
+ int cmp;
+
+ cmp = memcmp (cid,
+ &cc->cid,
+ sizeof (*cid));
+ if (0 == cmp)
+ {
+ /* Two peers picked the SAME random connection identifier at the
+ same time for the same path? Must be malicious. Drop
+ connection (existing and inbound), even if it is the only
+ one. */
+ GNUNET_break_op (0);
+ GCT_connection_lost (cc->ct);
+ GCC_destroy_without_tunnel (cc);
+ return NULL;
+ }
+ if (0 < cmp)
+ {
+ /* drop existing */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got two connections on %s, dropping my existing %s\n",
+ GCPP_2s (path),
+ GCC_2s (cc));
+ GCT_connection_lost (cc->ct);
+ GCC_destroy_without_tunnel (cc);
+ }
+ else
+ {
+ /* keep existing */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got two connections on %s, keeping my existing %s\n",
+ GCPP_2s (path),
+ GCC_2s (cc));
+ return NULL;
+ }
+ }
+
return connection_create (destination,
path,
+ off,
+ options,
ct,
cid,
CADET_CONNECTION_CREATE_RECEIVED,
*
* @param destination where to go
* @param path which path to take (may not be the full path)
+ * @param off offset of @a destination on @a path
+ * @param options options for the connection
* @param ct tunnel that uses the connection
* @param ready_cb function to call when ready to transmit
* @param ready_cb_cls closure for @a cb
struct CadetConnection *
GCC_create (struct CadetPeer *destination,
struct CadetPeerPath *path,
+ unsigned int off,
+ enum GNUNET_CADET_ChannelOption options,
struct CadetTConnection *ct,
GCC_ReadyCallback ready_cb,
void *ready_cb_cls)
sizeof (cid));
return connection_create (destination,
path,
+ off,
+ options,
ct,
&cid,
CADET_CONNECTION_NEW,
GCC_2s (cc));
GNUNET_assert (GNUNET_YES == cc->mqm_ready);
GNUNET_assert (CADET_CONNECTION_READY == cc->state);
+ cc->metrics.last_use = GNUNET_TIME_absolute_get ();
cc->mqm_ready = GNUNET_NO;
if (NULL != cc->task)
{
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