gnunet-service-cadet_connection.h File Reference

A connection is a live end-to-end messaging mechanism where the peers are identified by a path and know how to forward along the route using a connection identifier for routing the data. More...

#include "gnunet_util_lib.h"
#include "gnunet-service-cadet.h"
#include "gnunet-service-cadet_peer.h"
#include "cadet_protocol.h"

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Data Structures
struct	CadetConnectionCreatePS
	Purpose for the signature of a monotime. More...
struct	CadetConnectionMetrics
	Performance metrics for a connection. More...

Typedefs
typedef void(*	GCC_ReadyCallback) (void *cls, int is_ready)
	Function called to notify tunnel about change in our readiness.

Functions
void	GCC_destroy_without_core (struct CadetConnection *cc)
	Destroy a connection, called when the CORE layer is already done (i.e.
void	GCC_destroy_without_tunnel (struct CadetConnection *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.
struct CadetConnection *	GCC_lookup (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
	Lookup a connection by its identifier.
struct CadetConnection *	GCC_create (struct CadetPeer *destination, struct CadetPeerPath *path, unsigned int off, struct CadetTConnection *ct, GCC_ReadyCallback ready_cb, void *ready_cb_cls)
	Create a connection to destination via path and notify cb whenever we are ready for more data.
struct CadetConnection *	GCC_create_inbound (struct CadetPeer *destination, struct CadetPeerPath *path, struct CadetTConnection *ct, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid, GCC_ReadyCallback ready_cb, void *ready_cb_cls)
	Create a connection to destination via path and notify cb whenever we are ready for more data.
void	GCC_transmit (struct CadetConnection *cc, struct GNUNET_MQ_Envelope *env)
	Transmit message msg via connection cc.
void	GCC_handle_connection_create_ack (struct CadetConnection *cc)
	A GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK was received for this connection, implying that the end-to-end connection is up.
void	GCC_handle_duplicate_create (struct CadetConnection *cc)
	We got a GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE for a connection that we already have.
void	GCC_handle_kx (struct CadetConnection *cc, const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg)
	Handle KX message.
void	GCC_handle_kx_auth (struct CadetConnection *cc, const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage *msg)
	Handle KX_AUTH message.
const struct CadetConnectionMetrics *	GCC_get_metrics (struct CadetConnection *cc)
	Obtain performance metrics from cc.
void	GCC_handle_encrypted (struct CadetConnection *cc, const struct GNUNET_CADET_TunnelEncryptedMessage *msg)
	Handle encrypted message.
void	GCC_ack_expected (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
	We sent a message for which we expect to receive an ACK via the connection identified by cti.
void	GCC_ack_observed (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
	We observed an ACK for a message that was originally sent via the connection identified by cti.
void	GCC_latency_observed (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cti, struct GNUNET_TIME_Relative latency)
	We observed some the given latency on the connection identified by cti.
struct CadetTConnection *	GCC_get_ct (struct CadetConnection *cc)
	Return the tunnel associated with this connection.
struct CadetPeerPath *	GCC_get_path (struct CadetConnection *cc, unsigned int *off)
	Obtain the path used by this connection.
const struct GNUNET_CADET_ConnectionTunnelIdentifier *	GCC_get_id (struct CadetConnection *cc)
	Obtain unique ID for the connection.
const char *	GCC_2s (const struct CadetConnection *cc)
	Get a (static) string for a connection.
void	GCC_debug (struct CadetConnection *cc, enum GNUNET_ErrorType level)
	Log connection info.

Detailed Description

A connection is a live end-to-end messaging mechanism where the peers are identified by a path and know how to forward along the route using a connection identifier for routing the data.

Author

Bartlomiej Polot

Christian Grothoff

Definition in file gnunet-service-cadet_connection.h.

Typedef Documentation

GCC_ReadyCallback

typedef void(* GCC_ReadyCallback) (void *cls, int is_ready)

Function called to notify tunnel about change in our readiness.

Parameters

cls	closure
is_ready	GNUNET_YES if the connection is now ready for transmission, GNUNET_NO if the connection is no longer ready for transmission

Definition at line 46 of file gnunet-service-cadet_connection.h.

Function Documentation

GCC_destroy_without_core()

void GCC_destroy_without_core

(

struct CadetConnection *

cc

)

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).

Parameters

cc	connection to destroy

Definition at line 284 of file gnunet-service-cadet_connection.c.

{
  if (NULL != cc->ct)
  {
    GCT_connection_lost (cc->ct);
    cc->ct = NULL;
  }
  GCC_destroy (cc);
}

References CadetConnection::ct, GCC_destroy(), GCT_connection_lost(), and CadetConnection::off.

Referenced by handle_connection_broken(), and handle_connection_destroy().

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GCC_destroy_without_tunnel()

void GCC_destroy_without_tunnel

(

struct CadetConnection *

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.

Parameters

cc	connection to destroy

Definition at line 303 of file gnunet-service-cadet_connection.c.

{
  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);
}

References CADET_CONNECTION_SENDING_CREATE, GNUNET_CADET_ConnectionDestroyMessage::cid, CadetConnection::cid, CadetConnection::ct, env, GCC_destroy(), GCP_request_mq_cancel(), GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY, GNUNET_MQ_msg, CadetConnection::mq_man, CadetConnection::off, and CadetConnection::state.

Referenced by destroy_t_connection(), and GCC_create_inbound().

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GCC_lookup()

struct CadetConnection * GCC_lookup

(

const struct GNUNET_CADET_ConnectionTunnelIdentifier *

cid

)

Lookup a connection by its identifier.

Parameters

cid	identifier to resolve

Returns

NULL if connection was not found

Definition at line 186 of file gnunet-service-cadet_connection.c.

{
  return GNUNET_CONTAINER_multishortmap_get (connections,
                                             &cid->connection_of_tunnel);
}

References CadetConnection::cid, GNUNET_CADET_ConnectionTunnelIdentifier::connection_of_tunnel, connections, and GNUNET_CONTAINER_multishortmap_get().

Referenced by data_sent_cb(), GCC_ack_expected(), GCC_ack_observed(), GCC_latency_observed(), handle_connection_broken(), handle_connection_create(), handle_connection_create_ack(), handle_connection_destroy(), handle_tunnel_encrypted(), handle_tunnel_kx(), and handle_tunnel_kx_auth().

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GCC_create()

struct CadetConnection * GCC_create	(	struct CadetPeer *	destination,
		struct CadetPeerPath *	path,
		unsigned int	off,
		struct CadetTConnection *	ct,
		GCC_ReadyCallback	ready_cb,
		void *	ready_cb_cls
	)

Create a connection to destination via path and notify cb whenever we are ready for more data.

Parameters

destination	where to go
path	which path to take (may not be the full path)
off	offset of destination on path
ct	which tunnel uses this connection
ready_cb	function to call when ready to transmit
ready_cb_cls	closure for cb

Returns

handle to the connection

Definition at line 932 of file gnunet-service-cadet_connection.c.

{
  struct GNUNET_CADET_ConnectionTunnelIdentifier cid;
 
  GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE, &cid, sizeof(cid));
  return connection_create (destination,
                            path,
                            off,
                            ct,
                            &cid,
                            CADET_CONNECTION_NEW,
                            ready_cb,
                            ready_cb_cls);
}

References CADET_CONNECTION_NEW, connection_create(), GNUNET_CRYPTO_QUALITY_NONCE, and GNUNET_CRYPTO_random_block().

Referenced by consider_path_cb().

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GCC_create_inbound()

struct CadetConnection * GCC_create_inbound	(	struct CadetPeer *	destination,
		struct CadetPeerPath *	path,
		struct CadetTConnection *	ct,
		const struct GNUNET_CADET_ConnectionTunnelIdentifier *	cid,
		GCC_ReadyCallback	ready_cb,
		void *	ready_cb_cls
	)

Create a connection to destination via path and notify cb whenever we are ready for more data.

This is an inbound tunnel, so we must use the existing cid

Parameters

destination	where to go
path	which path to take (may not be the full path)
ct	which tunnel uses this connection
ready_cb	function to call when ready to transmit
ready_cb_cls	closure for cb

Returns

handle to the connection, NULL if we already have a connection that takes precedence on path

Definition at line 870 of file gnunet-service-cadet_connection.c.

{
  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 = GNUNET_memcmp (cid, &cc->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,
                            ct,
                            cid,
                            CADET_CONNECTION_CREATE_RECEIVED,
                            ready_cb,
                            ready_cb_cls);
}

References CADET_CONNECTION_CREATE_RECEIVED, CadetConnection::cid, connection_create(), CadetConnection::ct, CadetConnection::destination, GCC_2s(), GCC_destroy_without_tunnel(), GCPP_2s(), GCPP_find_peer(), GCPP_get_connection(), GCT_connection_lost(), GNUNET_assert, GNUNET_break_op, GNUNET_ERROR_TYPE_DEBUG, GNUNET_memcmp, LOG, CadetConnection::off, CadetConnection::path, CadetConnection::ready_cb, and CadetConnection::ready_cb_cls.

Referenced by GCT_add_inbound_connection().

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GCC_transmit()

void GCC_transmit	(	struct CadetConnection *	cc,
		struct GNUNET_MQ_Envelope *	env
	)

Transmit message msg via connection cc.

Must only be called (once) after the connection has signalled that it is ready via the ready_cb. Clients can also use #GCC_is_ready() to check if the connection is right now ready for transmission.

Parameters

cc	connection identification
env	envelope with message to transmit; the #GNUNET_MQ_notify_send() must not have yet been used for the envelope. Also, the message better match the connection identifier of this connection...

Must only be called (once) after the connection has signalled that it is ready via the ready_cb. Clients can also use #GCC_is_ready() to check if the connection is right now ready for transmission.

Parameters

cc	connection identification
env	envelope with message to transmit; must NOT yet have a GNUNET_MQ_notify_sent() callback attached to it

Definition at line 964 of file gnunet-service-cadet_connection.c.

{
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Scheduling message for transmission on %s\n",
       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)
  {
    GNUNET_SCHEDULER_cancel (cc->task);
    cc->task = NULL;
  }
  GCP_send (cc->mq_man, env);
}

References CADET_CONNECTION_READY, env, GCC_2s(), GCP_send(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_NO, GNUNET_SCHEDULER_cancel(), GNUNET_TIME_absolute_get(), GNUNET_YES, CadetConnectionMetrics::last_use, LOG, CadetConnection::metrics, CadetConnection::mq_man, CadetConnection::mqm_ready, CadetConnection::state, and CadetConnection::task.

Referenced by send_kx(), send_kx_auth(), and try_send_normal_payload().

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GCC_handle_connection_create_ack()

void GCC_handle_connection_create_ack

(

struct CadetConnection *

cc

)

A GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK was received for this connection, implying that the end-to-end connection is up.

Process it.

Parameters

cc	the connection that got the ACK.

Definition at line 480 of file gnunet-service-cadet_connection.c.

{
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Received CADET_CONNECTION_CREATE_ACK for %s in state %d (%s)\n",
       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->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);
}

References CadetConnectionMetrics::age, CADET_CONNECTION_READY, GCC_2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_cancel(), GNUNET_TIME_absolute_get(), GNUNET_YES, keepalive_period, CadetConnection::keepalive_qe, LOG, CadetConnection::metrics, CadetConnection::mqm_ready, CadetConnection::off, send_keepalive(), CadetConnection::state, CadetConnection::task, and update_state().

Referenced by GCC_handle_encrypted(), GCC_handle_kx(), GCC_handle_kx_auth(), and handle_connection_create_ack().

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GCC_handle_duplicate_create()

void GCC_handle_duplicate_create

(

struct CadetConnection *

cc

)

We got a GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE for a connection that we already have.

Either our ACK got lost or something is fishy. Consider retransmitting the ACK.

Parameters

cc	connection that got the duplicate CREATE

Definition at line 695 of file gnunet-service-cadet_connection.c.

{
  if (GNUNET_YES == cc->mqm_ready)
  {
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Got duplicate CREATE for %s, scheduling another ACK (%s)\n",
         GCC_2s (cc),
         (GNUNET_YES == cc->mqm_ready) ? "MQM ready" : "MQM busy");
    /* Revert back to the state of having only received the 'CREATE',
       and immediately proceed to send the CREATE_ACK. */
    update_state (cc, CADET_CONNECTION_CREATE_RECEIVED, cc->mqm_ready);
    if (NULL != cc->task)
      GNUNET_SCHEDULER_cancel (cc->task);
    cc->task =
      GNUNET_SCHEDULER_add_at (cc->create_ack_at, &send_create_ack, cc);
  }
  else
  {
    /* We are currently sending something else back, which
       can only be an ACK or payload, either of which would
       do. So actually no need to do anything. */
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Got duplicate CREATE for %s. MQ is busy, not queueing another ACK\n",
         GCC_2s (cc));
  }
}

References CADET_CONNECTION_CREATE_RECEIVED, CadetConnection::create_ack_at, GCC_2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_at(), GNUNET_SCHEDULER_cancel(), GNUNET_YES, LOG, CadetConnection::mqm_ready, send_create_ack(), CadetConnection::task, and update_state().

Referenced by handle_connection_create().

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GCC_handle_kx()

void GCC_handle_kx	(	struct CadetConnection *	cc,
		const struct GNUNET_CADET_TunnelKeyExchangeMessage *	msg
	)

Handle KX message.

Parameters

cc	connection that received encrypted message
msg	the key exchange message

Definition at line 510 of file gnunet-service-cadet_connection.c.

{
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Received KX message with ephermal %s on CC %s in state %d\n",
       GNUNET_e2s (&msg->ephemeral_key),
       GNUNET_sh2s (&cc->cid.connection_of_tunnel),
       cc->state);
  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 (cc->ct, msg);
}

References CADET_CONNECTION_SENT, CadetConnection::cid, GNUNET_CADET_ConnectionTunnelIdentifier::connection_of_tunnel, CadetConnection::ct, GCC_2s(), GCC_handle_connection_create_ack(), GCT_handle_kx(), GNUNET_e2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_sh2s(), LOG, msg, and CadetConnection::state.

Referenced by handle_tunnel_kx().

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GCC_handle_kx_auth()

void GCC_handle_kx_auth	(	struct CadetConnection *	cc,
		const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage *	msg
	)

Handle KX_AUTH message.

Parameters

cc	connection that received encrypted message
msg	the key exchange message

Definition at line 538 of file gnunet-service-cadet_connection.c.

{
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Received KX AUTH message with ephermal %s on CC %s in state %d\n",
       GNUNET_e2s (&msg->kx.ephemeral_key),
       GNUNET_sh2s (&cc->cid.connection_of_tunnel),
       cc->state);
  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);
}

References CADET_CONNECTION_SENT, CadetConnection::cid, GNUNET_CADET_ConnectionTunnelIdentifier::connection_of_tunnel, CadetConnection::ct, GCC_2s(), GCC_handle_connection_create_ack(), GCT_handle_kx_auth(), GNUNET_e2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_sh2s(), LOG, msg, and CadetConnection::state.

Referenced by handle_tunnel_kx_auth().

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GCC_get_metrics()

const struct CadetConnectionMetrics * GCC_get_metrics

(

struct CadetConnection *

cc

)

Obtain performance metrics from cc.

Parameters

cc	connection to query

Returns

the metrics

Definition at line 342 of file gnunet-service-cadet_connection.c.

{
  return &cc->metrics;
}

References CadetConnection::metrics.

Referenced by data_sent_cb(), and evaluate_connection().

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GCC_handle_encrypted()

void GCC_handle_encrypted	(	struct CadetConnection *	cc,
		const struct GNUNET_CADET_TunnelEncryptedMessage *	msg
	)

Handle encrypted message.

Parameters

cc	connection that received encrypted message
msg	the encrypted message to decrypt

Definition at line 566 of file gnunet-service-cadet_connection.c.

{
  if (CADET_CONNECTION_SENT == cc->state)
  {
    /* We didn't get the 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 ACK for %s due to ENCRYPTED payload\n",
         GCC_2s (cc));
    GCC_handle_connection_create_ack (cc);
  }
  cc->metrics.last_use = GNUNET_TIME_absolute_get ();
  GCT_handle_encrypted (cc->ct, msg);
}

References CADET_CONNECTION_SENT, CadetConnection::ct, GCC_2s(), GCC_handle_connection_create_ack(), GCT_handle_encrypted(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_TIME_absolute_get(), CadetConnectionMetrics::last_use, LOG, CadetConnection::metrics, msg, and CadetConnection::state.

Referenced by handle_tunnel_encrypted().

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GCC_ack_expected()

void GCC_ack_expected

(

const struct GNUNET_CADET_ConnectionTunnelIdentifier *

cid

)

We sent a message for which we expect to receive an ACK via the connection identified by cti.

Parameters

cid	connection identifier where we expect an ACK

Definition at line 421 of file gnunet-service-cadet_connection.c.

{
  struct CadetConnection *cc;
 
  cc = GCC_lookup (cid);
  if (NULL == cc)
    return; /* whopise, connection already down? */
  cc->metrics.num_acked_transmissions++;
}

References CadetConnection::cid, GCC_lookup(), CadetConnection::metrics, CadetConnectionMetrics::num_acked_transmissions, and CadetConnection::off.

Referenced by data_sent_cb().

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GCC_ack_observed()

void GCC_ack_observed

(

const struct GNUNET_CADET_ConnectionTunnelIdentifier *

cid

)

We observed an ACK for a message that was originally sent via the connection identified by cti.

Parameters

cid	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).

We observed an ACK for a message that was originally sent via the connection identified by cti.

Parameters

cid	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).

Definition at line 441 of file gnunet-service-cadet_connection.c.

{
  struct CadetConnection *cc;
 
  cc = GCC_lookup (cid);
  if (NULL == cc)
    return; /* whopise, connection already down? */
  cc->metrics.num_successes++;
}

References CadetConnection::cid, GCC_lookup(), CadetConnection::metrics, CadetConnectionMetrics::num_successes, and CadetConnection::off.

Referenced by handle_matching_ack().

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GCC_latency_observed()

void GCC_latency_observed	(	const struct GNUNET_CADET_ConnectionTunnelIdentifier *	cti,
		struct GNUNET_TIME_Relative	latency
	)

We observed some the given latency on the connection identified by cti.

(The same connection was taken in both directions.)

Parameters

cti	connection identifier where we measured latency
latency	the observed latency

Definition at line 453 of file gnunet-service-cadet_connection.c.

{
  struct CadetConnection *cc;
  double weight;
  double result;
 
  cc = GCC_lookup (cid);
  if (NULL == cc)
    return; /* whopise, connection already 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;
}

References CadetConnectionMetrics::aged_latency, CadetConnection::cid, GCC_lookup(), GNUNET_NO, GNUNET_STATISTICS_update(), CadetConnection::latency_datapoints, CadetConnection::metrics, CadetConnection::off, GNUNET_TIME_Relative::rel_value_us, result, and stats.

Referenced by handle_matching_ack().

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GCC_get_ct()

struct CadetTConnection * GCC_get_ct

(

struct CadetConnection *

cc

)

Return the tunnel associated with this connection.

Parameters

cc	connection to query

Returns

corresponding entry in the tunnel's connection list

Definition at line 329 of file gnunet-service-cadet_connection.c.

{
  return cc->ct;
}

References CadetTConnection::cc, and CadetConnection::ct.

GCC_get_path()

struct CadetPeerPath * GCC_get_path	(	struct CadetConnection *	cc,
		unsigned int *	off
	)

Obtain the path used by this connection.

Parameters

	cc	connection
[out]	off	set to offset in this path where the connection cc ends

Returns

path to cc

Parameters

	cc	connection
[out]	off	set to the length of the path we use

Returns

path to cc

Definition at line 990 of file gnunet-service-cadet_connection.c.

{
  *off = cc->off;
  return cc->path;
}

References CadetConnection::off, and CadetConnection::path.

Referenced by evaluate_connection(), handle_connection_broken(), handle_connection_create_ack(), handle_connection_destroy(), handle_tunnel_encrypted(), handle_tunnel_kx(), and handle_tunnel_kx_auth().

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GCC_get_id()

const struct GNUNET_CADET_ConnectionTunnelIdentifier * GCC_get_id

(

struct CadetConnection *

cc

)

Obtain unique ID for the connection.

Parameters

cc	connection.

Returns

unique number of the connection

Definition at line 1004 of file gnunet-service-cadet_connection.c.

{
  return &cc->cid;
}

References CadetConnection::cid.

Referenced by connection_create(), GCC_destroy(), GCP_add_connection(), GCP_remove_connection(), handle_plaintext_channel_destroy(), handle_plaintext_channel_open(), handle_plaintext_channel_open_ack(), handle_plaintext_data(), handle_plaintext_data_ack(), send_kx(), send_kx_auth(), and try_send_normal_payload().

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GCC_2s()

const char * GCC_2s

(

const struct CadetConnection *

cc

)

Get a (static) string for a connection.

Parameters

cc	Connection.

Definition at line 1016 of file gnunet-service-cadet_connection.c.

{
  static char buf[128];
 
  if (NULL == cc)
    return "Connection(NULL)";
 
  if (NULL != cc->ct)
  {
    GNUNET_snprintf (buf,
                     sizeof(buf),
                     "Connection %s (%s)",
                     GNUNET_sh2s (&cc->cid.connection_of_tunnel),
                     GCT_2s (cc->ct->t));
    return buf;
  }
  GNUNET_snprintf (buf,
                   sizeof(buf),
                   "Connection %s",
                   GNUNET_sh2s (&cc->cid.connection_of_tunnel));
  return buf;
}

References CadetConnection::cid, GNUNET_CADET_ConnectionTunnelIdentifier::connection_of_tunnel, CadetConnection::ct, GCT_2s(), GNUNET_sh2s(), GNUNET_snprintf(), and CadetTConnection::t.

Referenced by connection_create(), connection_ready_cb(), consider_path_cb(), evaluate_connection(), GCC_create_inbound(), GCC_debug(), GCC_destroy(), GCC_handle_connection_create_ack(), GCC_handle_duplicate_create(), GCC_handle_encrypted(), GCC_handle_kx(), GCC_handle_kx_auth(), GCC_transmit(), GCP_add_connection(), GCP_remove_connection(), GCPP_add_connection(), GCPP_del_connection(), GCT_add_inbound_connection(), GCT_handle_kx(), manage_first_hop_mq(), send_create(), send_create_ack(), send_keepalive(), and try_send_normal_payload().

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GCC_debug()

void GCC_debug	(	struct CadetConnection *	cc,
		enum GNUNET_ErrorType	level
	)

Log connection info.

Parameters

cc	connection
level	Debug level to use.

Definition at line 1051 of file gnunet-service-cadet_connection.c.

{
#if ! defined(GNUNET_CULL_LOGGING)
  int do_log;
 
  do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
                                       "cadet-con",
                                       __FILE__,
                                       __FUNCTION__,
                                       __LINE__);
  if (0 == do_log)
    return;
  if (NULL == cc)
  {
    LOG2 (level, "Connection (NULL)\n");
    return;
  }
  LOG2 (level,
        "%s to %s via path %s in state %d is %s\n",
        GCC_2s (cc),
        GCP_2s (cc->destination),
        GCPP_2s (cc->path),
        cc->state,
        (GNUNET_YES == cc->mqm_ready) ? "ready" : "busy");
#endif
}

References CadetConnection::destination, GCC_2s(), GCP_2s(), GCPP_2s(), GNUNET_ERROR_TYPE_BULK, GNUNET_get_log_call_status(), GNUNET_YES, LOG2, CadetConnection::mqm_ready, CadetConnection::path, and CadetConnection::state.

Referenced by GCT_debug().

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