gnunet-service-cadet_channel.h File Reference

GNUnet CADET service with encryption. More...

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

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Functions
void	GCCH_hash_port (struct GNUNET_HashCode *h_port, const struct GNUNET_HashCode *port, const struct GNUNET_PeerIdentity *listener)
	Hash the port and initiator and listener to calculate the "challenge" h_port we send to the other peer on GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN.
int	GCCH_is_type_to_drop (struct CadetChannel *ch, const struct GNUNET_MessageHeader *message)
	Check if type of message is the one to drop.
void	GCCH_assign_type_to_drop (struct CadetChannel *ch, const struct GNUNET_CADET_RequestDropCadetMessage *message)
	Assign type of message to drop.
const char *	GCCH_2s (const struct CadetChannel *ch)
	Get the static string for identification of the channel.
void	GCCH_debug (struct CadetChannel *ch, enum GNUNET_ErrorType level)
	Log channel info.
struct GNUNET_CADET_ChannelTunnelNumber	GCCH_get_id (const struct CadetChannel *ch)
	Get the channel's public ID.
struct CadetChannel *	GCCH_channel_local_new (struct CadetClient *owner, struct GNUNET_CADET_ClientChannelNumber owner_id, struct CadetPeer *destination, const struct GNUNET_HashCode *port, uint32_t options)
	Create a new channel.
void	GCCH_bind (struct CadetChannel *ch, struct CadetClient *c, const struct GNUNET_HashCode *port)
	A client is bound to the port that we have a channel open to.
void	GCCH_channel_local_destroy (struct CadetChannel *ch, struct CadetClient *c, struct GNUNET_CADET_ClientChannelNumber ccn)
	Destroy locally created channel.
void	GCCH_tunnel_up (struct CadetChannel *ch)
	Function called once and only once after a channel was bound to its tunnel via GCT_add_channel() is ready for transmission.
struct CadetChannel *	GCCH_channel_incoming_new (struct CadetTunnel *t, struct GNUNET_CADET_ChannelTunnelNumber chid, const struct GNUNET_HashCode *h_port, uint32_t options)
	Create a new channel based on a request coming in over the network.
void	GCCH_handle_duplicate_open (struct CadetChannel *ch, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cti)
	We got a GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN message again for this channel.
void	GCCH_handle_channel_plaintext_data (struct CadetChannel *ch, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cti, const struct GNUNET_CADET_ChannelAppDataMessage *msg)
	We got payload data for a channel.
void	GCCH_handle_channel_plaintext_data_ack (struct CadetChannel *ch, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cti, const struct GNUNET_CADET_ChannelDataAckMessage *ack)
	We got an acknowledgement for payload data for a channel.
void	GCCH_handle_channel_open_ack (struct CadetChannel *ch, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cti, const struct GNUNET_HashCode *port)
	We got an acknowledgement for the creation of the channel (the port is open on the other side).
void	GCCH_handle_remote_destroy (struct CadetChannel *ch, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cti)
	Destroy channel, based on the other peer closing the connection.
int	GCCH_handle_local_data (struct CadetChannel *ch, struct GNUNET_CADET_ClientChannelNumber sender_ccn, const char *buf, size_t buf_len)
	Handle data given by a client.
void	GCCH_handle_local_ack (struct CadetChannel *ch, struct GNUNET_CADET_ClientChannelNumber client_ccn)
	Handle ACK from client on local channel.

Detailed Description

GNUnet CADET service with encryption.

Author

Bartlomiej Polot

Christian Grothoff

Definition in file gnunet-service-cadet_channel.h.

Function Documentation

GCCH_hash_port()

void GCCH_hash_port	(	struct GNUNET_HashCode *	h_port,
		const struct GNUNET_HashCode *	port,
		const struct GNUNET_PeerIdentity *	listener
	)

Hash the port and initiator and listener to calculate the "challenge" h_port we send to the other peer on GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN.

Parameters

[out]	h_port	set to the hash of port, initiator and listener
	port	cadet port, as seen by CADET clients
	listener	peer that is listining on port

Definition at line 462 of file gnunet-service-cadet_channel.c.

{
  struct GNUNET_HashContext *hc;
 
  hc = GNUNET_CRYPTO_hash_context_start ();
  GNUNET_CRYPTO_hash_context_read (hc, port, sizeof(*port));
  GNUNET_CRYPTO_hash_context_read (hc, listener, sizeof(*listener));
  GNUNET_CRYPTO_hash_context_finish (hc, h_port);
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Calculated port hash %s\n",
       GNUNET_h2s (h_port));
}

References GNUNET_CRYPTO_hash_context_finish(), GNUNET_CRYPTO_hash_context_read(), GNUNET_CRYPTO_hash_context_start(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), LOG, and port.

Referenced by GCCH_channel_local_new(), and handle_port_open().

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GCCH_is_type_to_drop()

int GCCH_is_type_to_drop	(	struct CadetChannel *	ch,
		const struct GNUNET_MessageHeader *	message
	)

Check if type of message is the one to drop.

Parameters

ch	CadetChannel to check for message type to drop.
message	GNUNET_MessageHeader to compare the type with.

Definition at line 408 of file gnunet-service-cadet_channel.c.

{
 
  if (ch->type == message->type)
  {
    ch->type = 0;
    return GNUNET_YES;
  }
  else
    return GNUNET_NO;
}

References ch, GNUNET_NO, GNUNET_YES, and GNUNET_MessageHeader::type.

Referenced by GCT_send().

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GCCH_assign_type_to_drop()

void GCCH_assign_type_to_drop	(	struct CadetChannel *	ch,
		const struct GNUNET_CADET_RequestDropCadetMessage *	message
	)

Assign type of message to drop.

Parameters

ch	CadetChannel to assign type to drop.
message	GNUNET_CADET_RequestDropCadetMessage to get the type from.

Definition at line 393 of file gnunet-service-cadet_channel.c.

{
 
  ch->type = message->type;
 
}

References ch, and GNUNET_CADET_RequestDropCadetMessage::type.

Referenced by handle_drop_message().

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GCCH_2s()

const char * GCCH_2s

(

const struct CadetChannel *

ch

)

Get the static string for identification of the channel.

Parameters

ch

Channel.

Returns

Static string with the channel IDs.

Definition at line 430 of file gnunet-service-cadet_channel.c.

{
  static char buf[128];
 
  GNUNET_snprintf (buf,
                   sizeof(buf),
                   "Channel %s:%s ctn:%X(%X/%X)",
                   (GNUNET_YES == ch->is_loopback)
                   ? "loopback"
                   : GNUNET_i2s (GCP_get_id (GCT_get_destination (ch->t))),
                   GNUNET_h2s (&ch->port),
                   ch->ctn.cn,
                   (NULL == ch->owner)
                   ? 0
                   : ntohl (ch->owner->ccn.channel_of_client),
                   (NULL == ch->dest)
                   ? 0
                   : ntohl (ch->dest->ccn.channel_of_client));
  return buf;
}

References GNUNET_CADET_Channel::ccn, ch, GNUNET_CADET_ClientChannelNumber::channel_of_client, GCP_get_id(), GCT_get_destination(), GNUNET_h2s(), GNUNET_i2s(), GNUNET_snprintf(), and GNUNET_YES.

Referenced by channel_destroy_iterator(), channel_open_sent_cb(), data_sent_cb(), GCCH_bind(), GCCH_channel_local_destroy(), GCCH_handle_channel_open_ack(), GCCH_handle_channel_plaintext_data(), GCCH_handle_channel_plaintext_data_ack(), GCCH_handle_duplicate_open(), GCCH_handle_local_ack(), GCCH_handle_local_data(), GCCH_handle_remote_destroy(), GCCH_tunnel_up(), GCT_add_channel(), GCT_remove_channel(), GSC_bind(), handle_channel_destroy(), handle_local_ack(), handle_local_data(), handle_matching_ack(), handle_plaintext_channel_destroy(), handle_plaintext_channel_open(), handle_plaintext_channel_open_ack(), retry_transmission(), send_channel_data_ack(), send_channel_open(), and send_open_ack().

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GCCH_debug()

void GCCH_debug	(	struct CadetChannel *	ch,
		enum GNUNET_ErrorType	level
	)

Log channel info.

Parameters

ch	Channel.
level	Debug level to use.

Definition at line 1973 of file gnunet-service-cadet_channel.c.

{
#if ! defined(GNUNET_CULL_LOGGING)
  int do_log;
 
  do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
                                       "cadet-chn",
                                       __FILE__,
                                       __FUNCTION__,
                                       __LINE__);
  if (0 == do_log)
    return;
 
  if (NULL == ch)
  {
    LOG2 (level, "CHN *** DEBUG NULL CHANNEL ***\n");
    return;
  }
  LOG2 (level, "CHN %s:%X (%p)\n", GCT_2s (ch->t), ch->ctn.cn, ch);
  if (NULL != ch->owner)
  {
    LOG2 (level,
          "CHN origin %s ready %s local-id: %u\n",
          GSC_2s (ch->owner->c),
          ch->owner->client_ready ? "YES" : "NO",
          ntohl (ch->owner->ccn.channel_of_client));
  }
  if (NULL != ch->dest)
  {
    LOG2 (level,
          "CHN destination %s ready %s local-id: %u\n",
          GSC_2s (ch->dest->c),
          ch->dest->client_ready ? "YES" : "NO",
          ntohl (ch->dest->ccn.channel_of_client));
  }
  LOG2 (level,
        "CHN  Message IDs recv: %d (%llX), send: %d\n",
        ntohl (ch->mid_recv.mid),
        (unsigned long long) ch->mid_futures,
        ntohl (ch->mid_send.mid));
#endif
}

References GNUNET_CADET_Channel::ccn, ch, GNUNET_CADET_ClientChannelNumber::channel_of_client, GCT_2s(), GNUNET_ERROR_TYPE_BULK, GNUNET_get_log_call_status(), GSC_2s(), and LOG2.

Referenced by debug_channel().

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GCCH_get_id()

struct GNUNET_CADET_ChannelTunnelNumber GCCH_get_id

(

const struct CadetChannel *

ch

)

Get the channel's public ID.

Parameters

ch

Channel.

Returns

ID used to identify the channel with the remote peer.

Definition at line 486 of file gnunet-service-cadet_channel.c.

{
  return ch->ctn;
}

References ch.

GCCH_channel_local_new()

struct CadetChannel * GCCH_channel_local_new	(	struct CadetClient *	owner,
		struct GNUNET_CADET_ClientChannelNumber	owner_id,
		struct CadetPeer *	destination,
		const struct GNUNET_HashCode *	port,
		uint32_t	options
	)

Create a new channel.

Parameters

owner	local client owning the channel
owner_id	local chid of this channel at the owner
destination	peer to which we should build the channel
port	desired port at destination
options	options for the channel

Returns

handle to the new channel

Definition at line 660 of file gnunet-service-cadet_channel.c.

{
  const struct GNUNET_PeerIdentity *my_identity;
  struct CadetChannel *ch;
  struct CadetChannelClient *ccco;
 
  my_identity = GNUNET_PILS_get_identity (pils);
  GNUNET_assert (my_identity);
 
  ccco = GNUNET_new (struct CadetChannelClient);
  ccco->c = owner;
  ccco->ccn = ccn;
  ccco->client_ready = GNUNET_YES;
 
  ch = GNUNET_new (struct CadetChannel);
  ch->mid_recv.mid = htonl (1);  /* The OPEN_ACK counts as message 0! */
  ch->nobuffer = GNUNET_NO;
  ch->reliable = GNUNET_YES;
  ch->out_of_order = GNUNET_NO;
  ch->max_pending_messages =
    (ch->nobuffer) ? 1 : 4; /* FIXME: 4!? Do not hardcode! */
  ch->owner = ccco;
  ch->port = *port;
  GCCH_hash_port (&ch->h_port, port, GCP_get_id (destination));
  if (0 == GNUNET_memcmp (my_identity, GCP_get_id (destination)))
  {
    struct OpenPort *op;
 
    ch->is_loopback = GNUNET_YES;
    op = GNUNET_CONTAINER_multihashmap_get (open_ports, &ch->h_port);
    if (NULL == op)
    {
      /* port closed, wait for it to possibly open */
      ch->state = CADET_CHANNEL_LOOSE;
      (void) GNUNET_CONTAINER_multihashmap_put (
        loose_channels,
        &ch->h_port,
        ch,
        GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "Created loose incoming loopback channel to port %s\n",
           GNUNET_h2s (&ch->port));
    }
    else
    {
      GCCH_bind (ch, op->c, &op->port);
    }
  }
  else
  {
    ch->t = GCP_get_tunnel (destination, GNUNET_YES);
    ch->retry_time = CADET_INITIAL_RETRANSMIT_TIME;
    ch->ctn = GCT_add_channel (ch->t, ch);
  }
  GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Created channel to port %s at peer %s for %s using %s\n",
       GNUNET_h2s (port),
       GCP_2s (destination),
       GSC_2s (owner),
       (GNUNET_YES == ch->is_loopback) ? "loopback" : GCT_2s (ch->t));
  return ch;
}

References CadetChannelClient::c, CADET_CHANNEL_LOOSE, CADET_INITIAL_RETRANSMIT_TIME, CadetChannelClient::ccn, ch, CadetChannelClient::client_ready, GCCH_bind(), GCCH_hash_port(), GCP_2s(), GCP_get_id(), GCP_get_tunnel(), GCT_2s(), GCT_add_channel(), GNUNET_assert, GNUNET_CONTAINER_multihashmap_get(), GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_memcmp, GNUNET_new, GNUNET_NO, GNUNET_PILS_get_identity(), GNUNET_STATISTICS_update(), GNUNET_YES, GSC_2s(), LOG, loose_channels, my_identity, op, open_ports, pils, port, and stats.

Referenced by handle_channel_create().

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GCCH_bind()

void GCCH_bind	(	struct CadetChannel *	ch,
		struct CadetClient *	c,
		const struct GNUNET_HashCode *	port
	)

A client is bound to the port that we have a channel open to.

Send the acknowledgement for the connection request and establish the link with the client.

Parameters

ch	open incoming channel
c	client listening on the respective port
port	port number c is listening on

Definition at line 944 of file gnunet-service-cadet_channel.c.

{
  const struct GNUNET_PeerIdentity *my_identity;
  uint32_t options;
  struct CadetChannelClient *cccd;
 
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Binding %s from %s to port %s of %s\n",
       GCCH_2s (ch),
       GCT_2s (ch->t),
       GNUNET_h2s (&ch->port),
       GSC_2s (c));
 
  my_identity = GNUNET_PILS_get_identity (pils);
  GNUNET_assert (my_identity);
 
  if (NULL != ch->retry_control_task)
  {
    /* there might be a timeout task here */
    GNUNET_SCHEDULER_cancel (ch->retry_control_task);
    ch->retry_control_task = NULL;
  }
  options = 0;
  cccd = GNUNET_new (struct CadetChannelClient);
  GNUNET_assert (NULL == ch->dest);
  ch->dest = cccd;
  ch->port = *port;
  cccd->c = c;
  cccd->client_ready = GNUNET_YES;
  cccd->ccn = GSC_bind (c,
                        ch,
                        (GNUNET_YES == ch->is_loopback)
                        ? GCP_get (my_identity, GNUNET_YES)
                        : GCT_get_destination (ch->t),
                        port,
                        options);
  GNUNET_assert (ntohl (cccd->ccn.channel_of_client) <
                 GNUNET_CADET_LOCAL_CHANNEL_ID_CLI);
  ch->mid_recv.mid = htonl (1);  /* The OPEN counts as message 0! */
  if (GNUNET_YES == ch->is_loopback)
  {
    ch->state = CADET_CHANNEL_OPEN_SENT;
    GCCH_handle_channel_open_ack (ch, NULL, port);
  }
  else
  {
    /* notify other peer that we accepted the connection */
    ch->state = CADET_CHANNEL_READY;
    ch->retry_control_task = GNUNET_SCHEDULER_add_now (&send_open_ack, ch);
  }
  /* give client it's initial supply of ACKs */
  GNUNET_assert (ntohl (cccd->ccn.channel_of_client) <
                 GNUNET_CADET_LOCAL_CHANNEL_ID_CLI);
  for (unsigned int i = 0; i < ch->max_pending_messages; i++)
    send_ack_to_client (ch, GNUNET_NO);
}

References CadetChannelClient::c, CADET_CHANNEL_OPEN_SENT, CADET_CHANNEL_READY, CadetChannelClient::ccn, ch, GNUNET_CADET_ClientChannelNumber::channel_of_client, CadetChannelClient::client_ready, GCCH_2s(), GCCH_handle_channel_open_ack(), GCP_get(), GCT_2s(), GCT_get_destination(), GNUNET_assert, GNUNET_CADET_LOCAL_CHANNEL_ID_CLI, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_new, GNUNET_NO, GNUNET_PILS_get_identity(), GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_YES, GSC_2s(), GSC_bind(), LOG, my_identity, options, pils, port, send_ack_to_client(), and send_open_ack().

Referenced by bind_loose_channel(), GCCH_channel_incoming_new(), and GCCH_channel_local_new().

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GCCH_channel_local_destroy()

void GCCH_channel_local_destroy	(	struct CadetChannel *	ch,
		struct CadetClient *	c,
		struct GNUNET_CADET_ClientChannelNumber	ccn
	)

Destroy locally created channel.

Called by the local client, so no need to tell the client.

Parameters

ch	channel to destroy
c	client that caused the destruction
ccn	client number of the client c

Definition at line 1034 of file gnunet-service-cadet_channel.c.

{
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "%s asks for destruction of %s\n",
       GSC_2s (c),
       GCCH_2s (ch));
  GNUNET_assert (NULL != c);
  if ((NULL != ch->owner) && (c == ch->owner->c) &&
      (ccn.channel_of_client == ch->owner->ccn.channel_of_client))
  {
    free_channel_client (ch->owner);
    ch->owner = NULL;
  }
  else if ((NULL != ch->dest) && (c == ch->dest->c) &&
           (ccn.channel_of_client == ch->dest->ccn.channel_of_client))
  {
    free_channel_client (ch->dest);
    ch->dest = NULL;
  }
  else
  {
    GNUNET_assert (0);
  }
 
  if (GNUNET_YES == ch->destroy)
  {
    /* other end already destroyed, with the local client gone, no need
       to finish transmissions, just destroy immediately. */
    channel_destroy (ch);
    return;
  }
  if ((NULL != ch->head_sent) && ((NULL != ch->owner) || (NULL != ch->dest)))
  {
    /* Wait for other end to destroy us as well,
       and otherwise allow send queue to be transmitted first */
    ch->destroy = GNUNET_YES;
    return;
  }
  if ((GNUNET_YES == ch->is_loopback) &&
      ((NULL != ch->owner) || (NULL != ch->dest)))
  {
    if (NULL != ch->retry_control_task)
      GNUNET_SCHEDULER_cancel (ch->retry_control_task);
    ch->retry_control_task =
      GNUNET_SCHEDULER_add_now (&signal_remote_destroy_cb, ch);
    return;
  }
  if (GNUNET_NO == ch->is_loopback)
  {
    /* If the we ever sent the CHANNEL_CREATE, we need to send a destroy message. */
    switch (ch->state)
    {
    case CADET_CHANNEL_NEW:
      /* We gave up on a channel that we created as a client to a remote
         target, but that never went anywhere. Nothing to do here. */
      break;
 
    case CADET_CHANNEL_LOOSE:
      break;
 
    default:
      GCT_send_channel_destroy (ch->t, ch->ctn);
    }
  }
  /* Nothing left to do, just finish destruction */
  channel_destroy (ch);
}

References CadetChannelClient::c, CADET_CHANNEL_LOOSE, CADET_CHANNEL_NEW, GNUNET_CADET_Channel::ccn, CadetChannelClient::ccn, ch, channel_destroy(), GNUNET_CADET_ClientChannelNumber::channel_of_client, free_channel_client(), GCCH_2s(), GCT_send_channel_destroy(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_NO, GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_YES, GSC_2s(), LOG, and signal_remote_destroy_cb().

Referenced by channel_destroy_iterator(), and handle_channel_destroy().

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GCCH_tunnel_up()

void GCCH_tunnel_up

(

struct CadetChannel *

ch

)

Function called once and only once after a channel was bound to its tunnel via GCT_add_channel() is ready for transmission.

Note that this is only the case for channels that this peer initiates, as for incoming channels we assume that they are ready for transmission immediately upon receiving the open message. Used to bootstrap the GCT_send() process.

Parameters

ch	the channel for which the tunnel is now ready

Definition at line 649 of file gnunet-service-cadet_channel.c.

{
  GNUNET_assert (NULL == ch->retry_control_task);
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Tunnel up, sending CHANNEL_OPEN on %s now\n",
       GCCH_2s (ch));
  ch->retry_control_task = GNUNET_SCHEDULER_add_now (&send_channel_open, ch);
}

References ch, GCCH_2s(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_now(), LOG, and send_channel_open().

Referenced by GCT_add_channel(), and notify_tunnel_up_cb().

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GCCH_channel_incoming_new()

struct CadetChannel * GCCH_channel_incoming_new	(	struct CadetTunnel *	t,
		struct GNUNET_CADET_ChannelTunnelNumber	chid,
		const struct GNUNET_HashCode *	h_port,
		uint32_t	options
	)

Create a new channel based on a request coming in over the network.

Parameters

t	tunnel to the remote peer
chid	identifier of this channel in the tunnel
h_port	hash of desired local port
options	options for the channel

Returns

handle to the new channel

Definition at line 750 of file gnunet-service-cadet_channel.c.

{
  struct CadetChannel *ch;
  struct OpenPort *op;
 
  ch = GNUNET_new (struct CadetChannel);
  ch->h_port = *h_port;
  ch->t = t;
  ch->ctn = ctn;
  ch->retry_time = CADET_INITIAL_RETRANSMIT_TIME;
  ch->nobuffer = GNUNET_NO;
  ch->reliable = GNUNET_YES;
  ch->out_of_order = GNUNET_NO;
  ch->max_pending_messages =
    (ch->nobuffer) ? 1 : 4; /* FIXME: 4!? Do not hardcode! */
 
  op = GNUNET_CONTAINER_multihashmap_get (open_ports, h_port);
  if (NULL == op)
  {
    /* port closed, wait for it to possibly open */
    ch->state = CADET_CHANNEL_LOOSE;
    (void) GNUNET_CONTAINER_multihashmap_put (
      loose_channels,
      &ch->h_port,
      ch,
      GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
    GNUNET_assert (NULL == ch->retry_control_task);
    ch->retry_control_task = GNUNET_SCHEDULER_add_delayed (TIMEOUT_CLOSED_PORT,
                                                           &timeout_closed_cb,
                                                           ch);
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Created loose incoming channel to port %s from peer %s\n",
         GNUNET_h2s (&ch->port),
         GCP_2s (GCT_get_destination (ch->t)));
  }
  else
  {
    GCCH_bind (ch, op->c, &op->port);
  }
  GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
  return ch;
}

References CADET_CHANNEL_LOOSE, CADET_INITIAL_RETRANSMIT_TIME, ch, GCCH_bind(), GCP_2s(), GCT_get_destination(), GNUNET_assert, GNUNET_CONTAINER_multihashmap_get(), GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_new, GNUNET_NO, GNUNET_SCHEDULER_add_delayed(), GNUNET_STATISTICS_update(), GNUNET_YES, OpenPort::h_port, LOG, loose_channels, op, open_ports, stats, t, timeout_closed_cb(), and TIMEOUT_CLOSED_PORT.

Referenced by handle_plaintext_channel_open().

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GCCH_handle_duplicate_open()

void GCCH_handle_duplicate_open	(	struct CadetChannel *	ch,
		const struct GNUNET_CADET_ConnectionTunnelIdentifier *	cti
	)

We got a GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN message again for this channel.

If the binding was successful, (re)transmit the GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK.

Parameters

ch	channel that got the duplicate open
cti	identifier of the connection that delivered the message

Definition at line 883 of file gnunet-service-cadet_channel.c.

{
  if (NULL == ch->dest)
  {
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Ignoring duplicate CHANNEL_OPEN on %s: port is closed\n",
         GCCH_2s (ch));
    return;
  }
  if (NULL != ch->retry_control_task)
  {
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Ignoring duplicate CHANNEL_OPEN on %s: control message is pending\n",
         GCCH_2s (ch));
    return;
  }
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Retransmitting CHANNEL_OPEN_ACK on %s\n",
       GCCH_2s (ch));
  ch->retry_control_task = GNUNET_SCHEDULER_add_now (&send_open_ack, ch);
}

References ch, GCCH_2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_now(), LOG, and send_open_ack().

Referenced by handle_plaintext_channel_open().

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GCCH_handle_channel_plaintext_data()

void GCCH_handle_channel_plaintext_data	(	struct CadetChannel *	ch,
		const struct GNUNET_CADET_ConnectionTunnelIdentifier *	cti,
		const struct GNUNET_CADET_ChannelAppDataMessage *	msg
	)

We got payload data for a channel.

Pass it on to the client and send an ACK to the other end (once flow control allows it!)

Parameters

ch	channel that got data
cti	identifier of the connection that delivered the message
msg	message that was received

We always send if possible in this case. It is guaranteed that the queued MID < received MID

Definition at line 1198 of file gnunet-service-cadet_channel.c.

{
  struct GNUNET_MQ_Envelope *env;
  struct GNUNET_CADET_LocalData *ld;
  struct CadetChannelClient *ccc;
  size_t payload_size;
  struct CadetOutOfOrderMessage *com;
  int duplicate;
  uint32_t mid_min;
  uint32_t mid_max;
  uint32_t mid_msg;
  uint32_t delta;
 
  GNUNET_assert (GNUNET_NO == ch->is_loopback);
  if ((NULL == ch->owner) && (NULL == ch->dest))
  {
    /* This client is gone, but we still have messages to send to
       the other end (which is why @a ch is not yet dead).  However,
       we cannot pass messages to our client anymore. */
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Dropping incoming payload on %s as this end is already closed\n",
         GCCH_2s (ch));
    /* send back DESTROY notification to stop further retransmissions! */
    if (GNUNET_YES == ch->destroy)
      GCT_send_channel_destroy (ch->t, ch->ctn);
    return;
  }
  payload_size = ntohs (msg->header.size) - sizeof(*msg);
  env = GNUNET_MQ_msg_extra (ld,
                             payload_size,
                             GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA);
  ld->ccn = (NULL == ch->dest) ? ch->owner->ccn : ch->dest->ccn;
  GNUNET_memcpy (&ld[1], &msg[1], payload_size);
  ccc = (NULL != ch->owner) ? ch->owner : ch->dest;
  if (GNUNET_YES == ccc->client_ready)
  {
    /*
     * We ad-hoc send the message if
     * - The channel is out-of-order
     * - The channel is reliable and MID matches next expected MID
     * - The channel is unreliable and MID is before lowest seen MID
     */if ((GNUNET_YES == ch->out_of_order) ||
        ((msg->mid.mid == ch->mid_recv.mid) && (GNUNET_YES == ch->reliable)) ||
        ((GNUNET_NO == ch->reliable) &&
         (ntohl (msg->mid.mid) >= ntohl (ch->mid_recv.mid)) &&
         ((NULL == ccc->head_recv) ||
          (ntohl (msg->mid.mid) < ntohl (ccc->head_recv->mid.mid)))))
    {
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "Giving %u bytes of payload with MID %u from %s to client %s\n",
           (unsigned int) payload_size,
           ntohl (msg->mid.mid),
           GCCH_2s (ch),
           GSC_2s (ccc->c));
      ccc->client_ready = GNUNET_NO;
      GSC_send_to_client (ccc->c, env);
      if (GNUNET_NO == ch->out_of_order)
        ch->mid_recv.mid = htonl (1 + ntohl (msg->mid.mid));
      else
        ch->mid_recv.mid = htonl (1 + ntohl (ch->mid_recv.mid));
      ch->mid_futures >>= 1;
      if ((GNUNET_YES == ch->out_of_order) && (GNUNET_NO == ch->reliable))
      {
        /* possibly shift by more if we skipped messages */
        uint64_t d = ntohl (msg->mid.mid) - 1 - ntohl (ch->mid_recv.mid);
 
        if (d > 63)
          ch->mid_futures = 0;
        else
          ch->mid_futures >>= d;
        ch->mid_recv.mid = htonl (1 + ntohl (msg->mid.mid));
      }
      send_channel_data_ack (ch);
      return;
    }
  }
 
  if (GNUNET_YES == ch->reliable)
  {
    /* check if message ought to be dropped because it is ancient/too distant/duplicate */
    mid_min = ntohl (ch->mid_recv.mid);
    mid_max = mid_min + ch->max_pending_messages;
    mid_msg = ntohl (msg->mid.mid);
    if (((uint32_t) (mid_msg - mid_min) > ch->max_pending_messages) ||
        ((uint32_t) (mid_max - mid_msg) > ch->max_pending_messages))
    {
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "%s at %u drops ancient or far-future message %u\n",
           GCCH_2s (ch),
           (unsigned int) mid_min,
           ntohl (msg->mid.mid));
 
      GNUNET_STATISTICS_update (stats,
                                "# duplicate DATA (ancient or future)",
                                1,
                                GNUNET_NO);
      GNUNET_MQ_discard (env);
      send_channel_data_ack (ch);
      return;
    }
    /* mark bit for future ACKs */
    delta = mid_msg - mid_min - 1;   /* overflow/underflow are OK here */
    if (delta < 64)
    {
      if (0 != (ch->mid_futures & (1LLU << delta)))
      {
        /* Duplicate within the queue, drop also */
        LOG (GNUNET_ERROR_TYPE_DEBUG,
             "Duplicate payload of %u bytes on %s (mid %u) dropped\n",
             (unsigned int) payload_size,
             GCCH_2s (ch),
             ntohl (msg->mid.mid));
        GNUNET_STATISTICS_update (stats, "# duplicate DATA", 1, GNUNET_NO);
        GNUNET_MQ_discard (env);
        send_channel_data_ack (ch);
        return;
      }
      ch->mid_futures |= (1LLU << delta);
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "Marked bit %llX for mid %u (base: %u); now: %llX\n",
           (1LLU << delta),
           mid_msg,
           mid_min,
           (unsigned long long) ch->mid_futures);
    }
  }
  else /* ! ch->reliable */
  {
    struct CadetOutOfOrderMessage *next_msg;
 
    if ((NULL != ccc->head_recv) && (GNUNET_YES == ccc->client_ready))
    {
      next_msg = ccc->head_recv;
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "Giving queued MID %u from %s to client %s\n",
           ntohl (next_msg->mid.mid),
           GCCH_2s (ch),
           GSC_2s (ccc->c));
      ccc->client_ready = GNUNET_NO;
      GSC_send_to_client (ccc->c, next_msg->env);
      ch->mid_recv.mid = htonl (1 + ntohl (next_msg->mid.mid));
      ch->mid_futures >>= 1;
      send_channel_data_ack (ch);
      GNUNET_CONTAINER_DLL_remove (ccc->head_recv, ccc->tail_recv, next_msg);
      ccc->num_recv--;
      /* Do not process duplicate MID */
      if (msg->mid.mid == next_msg->mid.mid)     /* Duplicate */
      {
        /* Duplicate within the queue, drop */
        LOG (GNUNET_ERROR_TYPE_DEBUG,
             "Message on %s (mid %u) dropped, duplicate\n",
             GCCH_2s (ch),
             ntohl (msg->mid.mid));
        GNUNET_free (next_msg);
        GNUNET_MQ_discard (env);
        return;
      }
      GNUNET_free (next_msg);
    }
 
    if (ntohl (msg->mid.mid) < ntohl (ch->mid_recv.mid)) /* Old */
    {
      /* Duplicate within the queue, drop */
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "Message on %s (mid %u) dropped, old.\n",
           GCCH_2s (ch),
           ntohl (msg->mid.mid));
      GNUNET_MQ_discard (env);
      return;
    }
 
    /* Channel is unreliable, so we do not ACK. But we also cannot
       allow buffering everything, so check if we have space... */
    if (ccc->num_recv >= ch->max_pending_messages)
    {
      struct CadetOutOfOrderMessage *drop;
 
      /* Yep, need to drop. Drop the oldest message in
         the buffer. */
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "Queue full due slow client on %s, dropping oldest message\n",
           GCCH_2s (ch));
      GNUNET_STATISTICS_update (stats,
                                "# messages dropped due to slow client",
                                1,
                                GNUNET_NO);
      drop = ccc->head_recv;
      GNUNET_assert (NULL != drop);
      GNUNET_CONTAINER_DLL_remove (ccc->head_recv, ccc->tail_recv, drop);
      ccc->num_recv--;
      GNUNET_MQ_discard (drop->env);
      GNUNET_free (drop);
    }
  }
 
  /* Insert message into sorted out-of-order queue */
  com = GNUNET_new (struct CadetOutOfOrderMessage);
  com->mid = msg->mid;
  com->env = env;
  duplicate = GNUNET_NO;
  GNUNET_CONTAINER_DLL_insert_sorted (struct CadetOutOfOrderMessage,
                                      is_before,
                                      &duplicate,
                                      ccc->head_recv,
                                      ccc->tail_recv,
                                      com);
  ccc->num_recv++;
  if (GNUNET_YES == duplicate)
  {
    /* Duplicate within the queue, drop also (this is not covered by
       the case above if "delta" >= 64, which could be the case if
       max_pending_messages is also >= 64 or if our client is unready
       and we are seeing retransmissions of the message our client is
       blocked on. */LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Duplicate payload of %u bytes on %s (mid %u) dropped\n",
         (unsigned int) payload_size,
         GCCH_2s (ch),
         ntohl (msg->mid.mid));
    GNUNET_STATISTICS_update (stats, "# duplicate DATA", 1, GNUNET_NO);
    GNUNET_CONTAINER_DLL_remove (ccc->head_recv, ccc->tail_recv, com);
    ccc->num_recv--;
    GNUNET_MQ_discard (com->env);
    GNUNET_free (com);
    send_channel_data_ack (ch);
    return;
  }
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Queued %s payload of %u bytes on %s-%X(%p) (mid %u, need %u first)\n",
       (GNUNET_YES == ccc->client_ready) ? "out-of-order" : "client-not-ready",
       (unsigned int) payload_size,
       GCCH_2s (ch),
       ntohl (ccc->ccn.channel_of_client),
       ccc,
       ntohl (msg->mid.mid),
       ntohl (ch->mid_recv.mid));
  /* NOTE: this ACK we _could_ skip, as the packet is out-of-order and
     the sender may already be transmitting the previous one.  Needs
     experimental evaluation to see if/when this ACK helps or
     hurts. (We might even want another option.) */
  send_channel_data_ack (ch);
}

References CadetChannelClient::c, GNUNET_CADET_Channel::ccn, GNUNET_CADET_LocalData::ccn, CadetChannelClient::ccn, ch, GNUNET_CADET_ClientChannelNumber::channel_of_client, CadetChannelClient::client_ready, d, delta, env, CadetOutOfOrderMessage::env, GCCH_2s(), GCT_send_channel_destroy(), GNUNET_assert, GNUNET_CONTAINER_DLL_insert_sorted, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA, GNUNET_MQ_discard(), GNUNET_MQ_msg_extra, GNUNET_new, GNUNET_NO, GNUNET_STATISTICS_update(), GNUNET_YES, GSC_2s(), GSC_send_to_client(), CadetChannelClient::head_recv, is_before(), LOG, ChannelMessageIdentifier::mid, CadetOutOfOrderMessage::mid, msg, CadetChannelClient::num_recv, send_channel_data_ack(), GNUNET_MessageHeader::size, stats, and CadetChannelClient::tail_recv.

Referenced by handle_plaintext_data().

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GCCH_handle_channel_plaintext_data_ack()

void GCCH_handle_channel_plaintext_data_ack	(	struct CadetChannel *	ch,
		const struct GNUNET_CADET_ConnectionTunnelIdentifier *	cti,
		const struct GNUNET_CADET_ChannelDataAckMessage *	ack
	)

We got an acknowledgement for payload data for a channel.

Possibly resume transmissions.

Parameters

ch	channel that got the ack
cti	identifier of the connection that delivered the message
ack	details about what was received

Definition at line 1538 of file gnunet-service-cadet_channel.c.

{
  struct CadetReliableMessage *crm;
  struct CadetReliableMessage *crmn;
  int found;
  uint32_t mid_base;
  uint64_t mid_mask;
  unsigned int delta;
 
  GNUNET_break (GNUNET_NO == ch->is_loopback);
  if (GNUNET_NO == ch->reliable)
  {
    /* not expecting ACKs on unreliable channel, odd */
    GNUNET_break_op (0);
    return;
  }
  /* mid_base is the MID of the next message that the
     other peer expects (i.e. that is missing!), everything
     LOWER (but excluding mid_base itself) was received. */
  mid_base = ntohl (ack->mid.mid);
  mid_mask = GNUNET_htonll (ack->futures);
  found = GNUNET_NO;
  for (crm = ch->head_sent; NULL != crm; crm = crmn)
  {
    crmn = crm->next;
    delta = (unsigned int) (ntohl (crm->data_message->mid.mid) - mid_base);
    if (delta >= UINT_MAX - ch->max_pending_messages)
    {
      /* overflow, means crm was a bit in the past, so this ACK counts for it. */
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "Got DATA_ACK with base %u satisfying past message %u on %s\n",
           (unsigned int) mid_base,
           ntohl (crm->data_message->mid.mid),
           GCCH_2s (ch));
      handle_matching_ack (ch, cti, crm);
      found = GNUNET_YES;
      continue;
    }
    delta--;
    if (delta >= 64)
      continue;
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Testing bit %llX for mid %u (base: %u)\n",
         (1LLU << delta),
         ntohl (crm->data_message->mid.mid),
         mid_base);
    if (0 != (mid_mask & (1LLU << delta)))
    {
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "Got DATA_ACK with mask for %u on %s\n",
           ntohl (crm->data_message->mid.mid),
           GCCH_2s (ch));
      handle_matching_ack (ch, cti, crm);
      found = GNUNET_YES;
    }
  }
  if (GNUNET_NO == found)
  {
    /* ACK for message we already dropped, might have been a
       duplicate ACK? Ignore. */
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Duplicate DATA_ACK on %s, ignoring\n",
         GCCH_2s (ch));
    GNUNET_STATISTICS_update (stats, "# duplicate DATA_ACKs", 1, GNUNET_NO);
    return;
  }
  if (NULL != ch->retry_data_task)
  {
    GNUNET_SCHEDULER_cancel (ch->retry_data_task);
    ch->retry_data_task = NULL;
  }
  if ((NULL != ch->head_sent) && (NULL == ch->head_sent->qe))
    ch->retry_data_task = GNUNET_SCHEDULER_add_at (ch->head_sent->next_retry,
                                                   &retry_transmission,
                                                   ch);
}

References ch, CadetReliableMessage::data_message, delta, GNUNET_CADET_ChannelDataAckMessage::futures, GCCH_2s(), GNUNET_break, GNUNET_break_op, GNUNET_ERROR_TYPE_DEBUG, GNUNET_htonll(), GNUNET_NO, GNUNET_SCHEDULER_add_at(), GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_update(), GNUNET_YES, handle_matching_ack(), LOG, ChannelMessageIdentifier::mid, GNUNET_CADET_ChannelAppDataMessage::mid, GNUNET_CADET_ChannelDataAckMessage::mid, CadetReliableMessage::next, retry_transmission(), and stats.

Referenced by handle_plaintext_data_ack().

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GCCH_handle_channel_open_ack()

void GCCH_handle_channel_open_ack	(	struct CadetChannel *	ch,
		const struct GNUNET_CADET_ConnectionTunnelIdentifier *	cti,
		const struct GNUNET_HashCode *	port
	)

We got an acknowledgement for the creation of the channel (the port is open on the other side).

Verify that the other end really has the right port, and begin transmissions.

Parameters

ch	channel to destroy
cti	identifier of the connection that delivered the message, NULL if the ACK was inferred because we got payload or are on loopback
port	port number (needed to verify receiver knows the port)

Definition at line 1106 of file gnunet-service-cadet_channel.c.

{
  switch (ch->state)
  {
  case CADET_CHANNEL_NEW:
    /* this should be impossible */
    GNUNET_break (0);
    break;
 
  case CADET_CHANNEL_LOOSE:
    /* This makes no sense. */
    GNUNET_break_op (0);
    break;
 
  case CADET_CHANNEL_OPEN_SENT:
    if (NULL == ch->owner)
    {
      /* We're not the owner, wrong direction! */
      GNUNET_break_op (0);
      return;
    }
    if (0 != GNUNET_memcmp (&ch->port, port))
    {
      /* Other peer failed to provide the right port,
         refuse connection. */
      GNUNET_break_op (0);
      return;
    }
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Received CHANNEL_OPEN_ACK for waiting %s, entering READY state\n",
         GCCH_2s (ch));
    if (NULL != ch->retry_control_task)   /* can be NULL if ch->is_loopback */
    {
      GNUNET_SCHEDULER_cancel (ch->retry_control_task);
      ch->retry_control_task = NULL;
    }
    ch->state = CADET_CHANNEL_READY;
    /* On first connect, send client as many ACKs as we allow messages
       to be buffered! */
    for (unsigned int i = 0; i < ch->max_pending_messages; i++)
      send_ack_to_client (ch, GNUNET_YES);
    break;
 
  case CADET_CHANNEL_READY:
    /* duplicate ACK, maybe we retried the CREATE. Ignore. */
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Received duplicate channel OPEN_ACK for %s\n",
         GCCH_2s (ch));
    GNUNET_STATISTICS_update (stats, "# duplicate CREATE_ACKs", 1, GNUNET_NO);
    break;
  }
}

References CADET_CHANNEL_LOOSE, CADET_CHANNEL_NEW, CADET_CHANNEL_OPEN_SENT, CADET_CHANNEL_READY, ch, GCCH_2s(), GNUNET_break, GNUNET_break_op, GNUNET_ERROR_TYPE_DEBUG, GNUNET_memcmp, GNUNET_NO, GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_update(), GNUNET_YES, LOG, port, send_ack_to_client(), and stats.

Referenced by GCCH_bind(), and handle_plaintext_channel_open_ack().

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GCCH_handle_remote_destroy()

void GCCH_handle_remote_destroy	(	struct CadetChannel *	ch,
		const struct GNUNET_CADET_ConnectionTunnelIdentifier *	cti
	)

Destroy channel, based on the other peer closing the connection.

Also needs to remove this channel from the tunnel.

FIXME: need to make it possible to defer destruction until we have received all messages up to the destroy, and right now the destroy message (and this API) fails to give is the information we need!

FIXME: also need to know if the other peer got a destroy from us before!

Parameters

ch	channel to destroy
cti	identifier of the connection that delivered the message, NULL if we are simulating receiving a destroy due to shutdown

Definition at line 1620 of file gnunet-service-cadet_channel.c.

{
  struct CadetChannelClient *ccc;
 
  GNUNET_assert (GNUNET_NO == ch->is_loopback);
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Received remote channel DESTROY for %s\n",
       GCCH_2s (ch));
  if (GNUNET_YES == ch->destroy)
  {
    /* Local client already gone, this is instant-death. */
    channel_destroy (ch);
    return;
  }
  ccc = (NULL != ch->owner) ? ch->owner : ch->dest;
  if ((NULL != ccc) && (NULL != ccc->head_recv))
  {
    LOG (GNUNET_ERROR_TYPE_WARNING,
         "Lost end of transmission due to remote shutdown on %s\n",
         GCCH_2s (ch));
    /* FIXME: change API to notify client about truncated transmission! */
  }
  ch->destroy = GNUNET_YES;
  if (NULL != ccc)
    GSC_handle_remote_channel_destroy (ccc->c, ccc->ccn, ch);
  channel_destroy (ch);
}

References CadetChannelClient::c, CadetChannelClient::ccn, ch, channel_destroy(), GCCH_2s(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_NO, GNUNET_YES, GSC_handle_remote_channel_destroy(), CadetChannelClient::head_recv, and LOG.

Referenced by destroy_remaining_channels(), and handle_plaintext_channel_destroy().

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GCCH_handle_local_data()

int GCCH_handle_local_data	(	struct CadetChannel *	ch,
		struct GNUNET_CADET_ClientChannelNumber	sender_ccn,
		const char *	buf,
		size_t	buf_len
	)

Handle data given by a client.

Check whether the client is allowed to send in this tunnel, save if channel is reliable and send an ACK to the client if there is still buffer space in the tunnel.

Parameters

ch	Channel.
sender_ccn	ccn of the sender
buf	payload to transmit.
buf_len	number of bytes in buf

Returns

GNUNET_OK if everything goes well, GNUNET_SYSERR in case of an error.

Definition at line 1769 of file gnunet-service-cadet_channel.c.

{
  struct CadetReliableMessage *crm;
 
  if (ch->pending_messages >= ch->max_pending_messages)
  {
    GNUNET_break (0);  /* Fails: #5370 */
    return GNUNET_SYSERR;
  }
  if (GNUNET_YES == ch->destroy)
  {
    /* we are going down, drop messages */
    return GNUNET_OK;
  }
  ch->pending_messages++;
 
  if (GNUNET_YES == ch->is_loopback)
  {
    struct CadetChannelClient *receiver;
    struct GNUNET_MQ_Envelope *env;
    struct GNUNET_CADET_LocalData *ld;
    int ack_to_owner;
 
    env =
      GNUNET_MQ_msg_extra (ld, buf_len, GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA);
    if ((NULL != ch->owner) &&
        (sender_ccn.channel_of_client == ch->owner->ccn.channel_of_client))
    {
      receiver = ch->dest;
      ack_to_owner = GNUNET_YES;
    }
    else if ((NULL != ch->dest) &&
             (sender_ccn.channel_of_client == ch->dest->ccn.channel_of_client))
    {
      receiver = ch->owner;
      ack_to_owner = GNUNET_NO;
    }
    else
    {
      GNUNET_free (env);
      GNUNET_break (0);
      return GNUNET_SYSERR;
    }
    GNUNET_assert (NULL != receiver);
    ld->ccn = receiver->ccn;
    GNUNET_memcpy (&ld[1], buf, buf_len);
    if (GNUNET_YES == receiver->client_ready)
    {
      ch->pending_messages--;
      GSC_send_to_client (receiver->c, env);
      send_ack_to_client (ch, ack_to_owner);
    }
    else
    {
      struct CadetOutOfOrderMessage *oom;
 
      oom = GNUNET_new (struct CadetOutOfOrderMessage);
      oom->env = env;
      GNUNET_CONTAINER_DLL_insert_tail (receiver->head_recv,
                                        receiver->tail_recv,
                                        oom);
      receiver->num_recv++;
    }
    return GNUNET_OK;
  }
 
  /* Everything is correct, send the message. */
  crm = GNUNET_malloc (sizeof(*crm));
  crm->ch = ch;
  crm->data_message = GNUNET_malloc (
    sizeof(struct GNUNET_CADET_ChannelAppDataMessage) + buf_len);
  crm->data_message->header.size =
    htons (sizeof(struct GNUNET_CADET_ChannelAppDataMessage) + buf_len);
  crm->data_message->header.type =
    htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA);
  ch->mid_send.mid = htonl (ntohl (ch->mid_send.mid) + 1);
  crm->data_message->mid = ch->mid_send;
  crm->data_message->ctn = ch->ctn;
  GNUNET_memcpy (&crm->data_message[1], buf, buf_len);
  GNUNET_CONTAINER_DLL_insert_tail (ch->head_sent, ch->tail_sent, crm);
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Sending message %u from local client to %s with %lu bytes\n",
       ntohl (crm->data_message->mid.mid),
       GCCH_2s (ch),
       (unsigned long) buf_len);
  if (NULL != ch->retry_data_task)
  {
    GNUNET_SCHEDULER_cancel (ch->retry_data_task);
    ch->retry_data_task = NULL;
  }
  crm->qe = GCT_send (ch->t, &crm->data_message->header, &data_sent_cb, crm,
                      &crm->data_message->ctn);
  GNUNET_assert (NULL == ch->retry_data_task);
  return GNUNET_OK;
}

References GNUNET_CADET_Channel::ccn, GNUNET_CADET_LocalData::ccn, ch, CadetReliableMessage::ch, GNUNET_CADET_ClientChannelNumber::channel_of_client, GNUNET_CADET_ChannelAppDataMessage::ctn, CadetReliableMessage::data_message, data_sent_cb(), env, CadetOutOfOrderMessage::env, GCCH_2s(), GCT_send(), GNUNET_assert, GNUNET_break, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_malloc, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA, GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA, GNUNET_MQ_msg_extra, GNUNET_new, GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_cancel(), GNUNET_SYSERR, GNUNET_YES, GSC_send_to_client(), GNUNET_CADET_ChannelAppDataMessage::header, LOG, ChannelMessageIdentifier::mid, GNUNET_CADET_ChannelAppDataMessage::mid, CadetReliableMessage::qe, receiver(), send_ack_to_client(), GNUNET_MessageHeader::size, and GNUNET_MessageHeader::type.

Referenced by handle_local_data().

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GCCH_handle_local_ack()

void GCCH_handle_local_ack	(	struct CadetChannel *	ch,
		struct GNUNET_CADET_ClientChannelNumber	client_ccn
	)

Handle ACK from client on local channel.

Means the client is ready for more data, see if we have any for it.

Parameters

ch	channel to destroy
client_ccn	ccn of the client sending the ack

Definition at line 1870 of file gnunet-service-cadet_channel.c.

{
  struct CadetChannelClient *ccc;
  struct CadetOutOfOrderMessage *com;
 
  if ((NULL != ch->owner) &&
      (ch->owner->ccn.channel_of_client == client_ccn.channel_of_client))
    ccc = ch->owner;
  else if ((NULL != ch->dest) &&
           (ch->dest->ccn.channel_of_client == client_ccn.channel_of_client))
    ccc = ch->dest;
  else
    GNUNET_assert (0);
  ccc->client_ready = GNUNET_YES;
  com = ccc->head_recv;
  if (NULL == com)
  {
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Got LOCAL_ACK, %s-%X ready to receive more data, but none pending on %s-%X(%p)!\n",
         GSC_2s (ccc->c),
         ntohl (client_ccn.channel_of_client),
         GCCH_2s (ch),
         ntohl (ccc->ccn.channel_of_client),
         ccc);
    return;   /* none pending */
  }
  if (GNUNET_YES == ch->is_loopback)
  {
    int to_owner;
 
    /* Messages are always in-order, just send */
    GNUNET_CONTAINER_DLL_remove (ccc->head_recv, ccc->tail_recv, com);
    ccc->num_recv--;
    GSC_send_to_client (ccc->c, com->env);
    /* Notify sender that we can receive more */
    if ((NULL != ch->owner) &&
        (ccc->ccn.channel_of_client == ch->owner->ccn.channel_of_client))
    {
      to_owner = GNUNET_NO;
    }
    else
    {
      GNUNET_assert ((NULL != ch->dest) && (ccc->ccn.channel_of_client ==
                                            ch->dest->ccn.channel_of_client));
      to_owner = GNUNET_YES;
    }
    send_ack_to_client (ch, to_owner);
    GNUNET_free (com);
    return;
  }
 
  if ((com->mid.mid != ch->mid_recv.mid) && (GNUNET_NO == ch->out_of_order) &&
      (GNUNET_YES == ch->reliable))
  {
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Got LOCAL_ACK, %s-%X ready to receive more data (but next one is out-of-order %u vs. %u)!\n",
         GSC_2s (ccc->c),
         ntohl (ccc->ccn.channel_of_client),
         ntohl (com->mid.mid),
         ntohl (ch->mid_recv.mid));
    return;   /* missing next one in-order */
  }
 
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Got LOCAL_ACK, giving payload message %u to %s-%X on %s\n",
       ntohl (com->mid.mid),
       GSC_2s (ccc->c),
       ntohl (ccc->ccn.channel_of_client),
       GCCH_2s (ch));
 
  /* all good, pass next message to client */
  GNUNET_CONTAINER_DLL_remove (ccc->head_recv, ccc->tail_recv, com);
  ccc->num_recv--;
  /* FIXME: if unreliable, this is not aggressive
     enough, as it would be OK to have lost some! */
 
  ch->mid_recv.mid = htonl (1 + ntohl (com->mid.mid));
  ch->mid_futures >>= 1; /* equivalent to division by 2 */
  ccc->client_ready = GNUNET_NO;
  GSC_send_to_client (ccc->c, com->env);
  GNUNET_free (com);
  send_channel_data_ack (ch);
  if (NULL != ccc->head_recv)
    return;
  if (GNUNET_NO == ch->destroy)
    return;
  GCT_send_channel_destroy (ch->t, ch->ctn);
  channel_destroy (ch);
}

References CadetChannelClient::c, GNUNET_CADET_Channel::ccn, CadetChannelClient::ccn, ch, channel_destroy(), GNUNET_CADET_ClientChannelNumber::channel_of_client, CadetChannelClient::client_ready, CadetOutOfOrderMessage::env, GCCH_2s(), GCT_send_channel_destroy(), GNUNET_assert, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_NO, GNUNET_YES, GSC_2s(), GSC_send_to_client(), CadetChannelClient::head_recv, LOG, ChannelMessageIdentifier::mid, CadetOutOfOrderMessage::mid, CadetChannelClient::num_recv, send_ack_to_client(), send_channel_data_ack(), and CadetChannelClient::tail_recv.

Referenced by handle_local_ack().

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