GNUnet  0.11.x
Functions
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. More...
 
const char * GCCH_2s (const struct CadetChannel *ch)
 Get the static string for identification of the channel. More...
 
void GCCH_debug (struct CadetChannel *ch, enum GNUNET_ErrorType level)
 Log channel info. More...
 
struct GNUNET_CADET_ChannelTunnelNumber GCCH_get_id (const struct CadetChannel *ch)
 Get the channel's public ID. More...
 
struct CadetChannelGCCH_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. More...
 
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. More...
 
void GCCH_channel_local_destroy (struct CadetChannel *ch, struct CadetClient *c, struct GNUNET_CADET_ClientChannelNumber ccn)
 Destroy locally created channel. More...
 
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. More...
 
struct CadetChannelGCCH_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. More...
 
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. More...
 
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. More...
 
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. More...
 
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). More...
 
void GCCH_handle_remote_destroy (struct CadetChannel *ch, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cti)
 Destroy channel, based on the other peer closing the connection. More...
 
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. More...
 
void GCCH_handle_local_ack (struct CadetChannel *ch, struct GNUNET_CADET_ClientChannelNumber client_ccn)
 Handle ACK from client on local channel. More...
 

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_portset to the hash of port, initiator and listener
portcadet port, as seen by CADET clients
listenerpeer that is listining on port

Definition at line 426 of file gnunet-service-cadet_channel.c.

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

Referenced by GCCH_channel_local_new(), and handle_port_open().

429 {
430  struct GNUNET_HashContext *hc;
431 
433  GNUNET_CRYPTO_hash_context_read (hc, port, sizeof(*port));
434  GNUNET_CRYPTO_hash_context_read (hc, listener, sizeof(*listener));
437  "Calculated port hash %s\n",
438  GNUNET_h2s (h_port));
439 }
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
struct GNUNET_HashContext * GNUNET_CRYPTO_hash_context_start(void)
Start incremental hashing operation.
Definition: crypto_hash.c:466
Context for cummulative hashing.
Definition: crypto_hash.c:451
#define LOG(level,...)
void GNUNET_CRYPTO_hash_context_read(struct GNUNET_HashContext *hc, const void *buf, size_t size)
Add data to be hashed.
Definition: crypto_hash.c:492
void GNUNET_CRYPTO_hash_context_finish(struct GNUNET_HashContext *hc, struct GNUNET_HashCode *r_hash)
Finish the hash computation.
Definition: crypto_hash.c:509
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◆ GCCH_2s()

const char* GCCH_2s ( const struct CadetChannel ch)

Get the static string for identification of the channel.

Parameters
chChannel.
Returns
Static string with the channel IDs.

Definition at line 394 of file gnunet-service-cadet_channel.c.

References buf, CadetChannelClient::ccn, GNUNET_CADET_ClientChannelNumber::channel_of_client, CadetChannel::ctn, CadetChannel::dest, GCP_get_id(), GCT_get_destination(), GNUNET_h2s(), GNUNET_i2s(), GNUNET_snprintf(), GNUNET_YES, CadetChannel::is_loopback, CadetChannel::owner, CadetChannel::port, and CadetChannel::t.

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().

395 {
396  static char buf[128];
397 
398  GNUNET_snprintf (buf,
399  sizeof(buf),
400  "Channel %s:%s ctn:%X(%X/%X)",
401  (GNUNET_YES == ch->is_loopback)
402  ? "loopback"
404  GNUNET_h2s (&ch->port),
405  ch->ctn,
406  (NULL == ch->owner)
407  ? 0
408  : ntohl (ch->owner->ccn.channel_of_client),
409  (NULL == ch->dest)
410  ? 0
411  : ntohl (ch->dest->ccn.channel_of_client));
412  return buf;
413 }
struct CadetPeer * GCT_get_destination(struct CadetTunnel *t)
Return the peer to which this tunnel goes.
uint32_t channel_of_client
Values for channel numbering.
Definition: cadet.h:111
int GNUNET_snprintf(char *buf, size_t size, const char *format,...)
Like snprintf, just aborts if the buffer is of insufficient size.
struct CadetChannelClient * owner
Client owner of the tunnel, if any.
int is_loopback
Is this channel a loopback channel, where the destination is us again?
struct CadetChannelClient * dest
Client destination of the tunnel, if any.
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
struct CadetTunnel * t
Tunnel this channel is in.
struct GNUNET_CADET_ClientChannelNumber ccn
Local tunnel number for this client.
static char buf[2048]
struct GNUNET_CADET_ChannelTunnelNumber ctn
Number identifying this channel in its tunnel.
#define GNUNET_YES
Definition: gnunet_common.h:77
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
const struct GNUNET_PeerIdentity * GCP_get_id(struct CadetPeer *cp)
Obtain the peer identity for a struct CadetPeer.
struct GNUNET_HashCode port
Destination port of the channel.
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◆ GCCH_debug()

void GCCH_debug ( struct CadetChannel ch,
enum GNUNET_ErrorType  level 
)

Log channel info.

Parameters
chChannel.
levelDebug level to use.

Definition at line 1985 of file gnunet-service-cadet_channel.c.

References CadetChannelClient::c, CadetChannelClient::ccn, GNUNET_CADET_ClientChannelNumber::channel_of_client, CadetChannelClient::client_ready, CadetChannel::ctn, CadetChannel::dest, GCT_2s(), GNUNET_ERROR_TYPE_BULK, GNUNET_get_log_call_status(), GSC_2s(), LOG2, ChannelMessageIdentifier::mid, CadetChannel::mid_futures, CadetChannel::mid_recv, CadetChannel::mid_send, CadetChannel::owner, and CadetChannel::t.

Referenced by debug_channel().

1986 {
1987 #if ! defined(GNUNET_CULL_LOGGING)
1988  int do_log;
1989 
1991  "cadet-chn",
1992  __FILE__,
1993  __FUNCTION__,
1994  __LINE__);
1995  if (0 == do_log)
1996  return;
1997 
1998  if (NULL == ch)
1999  {
2000  LOG2 (level, "CHN *** DEBUG NULL CHANNEL ***\n");
2001  return;
2002  }
2003  LOG2 (level, "CHN %s:%X (%p)\n", GCT_2s (ch->t), ch->ctn, ch);
2004  if (NULL != ch->owner)
2005  {
2006  LOG2 (level,
2007  "CHN origin %s ready %s local-id: %u\n",
2008  GSC_2s (ch->owner->c),
2009  ch->owner->client_ready ? "YES" : "NO",
2010  ntohl (ch->owner->ccn.channel_of_client));
2011  }
2012  if (NULL != ch->dest)
2013  {
2014  LOG2 (level,
2015  "CHN destination %s ready %s local-id: %u\n",
2016  GSC_2s (ch->dest->c),
2017  ch->dest->client_ready ? "YES" : "NO",
2018  ntohl (ch->dest->ccn.channel_of_client));
2019  }
2020  LOG2 (level,
2021  "CHN Message IDs recv: %d (%LLX), send: %d\n",
2022  ntohl (ch->mid_recv.mid),
2023  (unsigned long long) ch->mid_futures,
2024  ntohl (ch->mid_send.mid));
2025 #endif
2026 }
uint32_t channel_of_client
Values for channel numbering.
Definition: cadet.h:111
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
struct CadetChannelClient * owner
Client owner of the tunnel, if any.
uint32_t mid
Unique ID of the message, cycles around, in NBO.
struct CadetChannelClient * dest
Client destination of the tunnel, if any.
struct ChannelMessageIdentifier mid_recv
Next MID expected for incoming traffic.
struct CadetTunnel * t
Tunnel this channel is in.
struct GNUNET_CADET_ClientChannelNumber ccn
Local tunnel number for this client.
struct GNUNET_CADET_ChannelTunnelNumber ctn
Number identifying this channel in its tunnel.
int GNUNET_get_log_call_status(int caller_level, const char *comp, const char *file, const char *function, int line)
Decides whether a particular logging call should or should not be allowed to be made.
#define LOG2(level,...)
int client_ready
Can we send data to the client?
const char * GSC_2s(struct CadetClient *c)
Return identifier for a client as a string.
struct CadetClient * c
Client handle.
struct ChannelMessageIdentifier mid_send
Next MID to use for outgoing traffic.
uint64_t mid_futures
Bitfield of already-received messages past mid_recv.
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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
chChannel.
Returns
ID used to identify the channel with the remote peer.

Definition at line 450 of file gnunet-service-cadet_channel.c.

References CadetReliableMessage::ch, and CadetChannel::ctn.

451 {
452  return ch->ctn;
453 }
struct GNUNET_CADET_ChannelTunnelNumber ctn
Number identifying this channel in its tunnel.

◆ GCCH_channel_local_new()

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

Create a new channel.

Parameters
ownerlocal client owning the channel
owner_idlocal chid of this channel at the owner
destinationpeer to which we should build the channel
portdesired port at destination
optionsoptions for the channel
Returns
handle to the new channel
Parameters
ownerlocal client owning the channel
ccnlocal number of this channel at the owner
destinationpeer to which we should build the channel
portdesired port at destination
optionsoptions for the channel
Returns
handle to the new channel

Definition at line 634 of file gnunet-service-cadet_channel.c.

References OpenPort::c, CadetChannelClient::c, CADET_CHANNEL_LOOSE, CADET_INITIAL_RETRANSMIT_TIME, CadetChannelClient::ccn, CadetReliableMessage::ch, CadetChannelClient::client_ready, CadetChannel::ctn, GCCH_bind(), GCCH_hash_port(), GCP_2s(), GCP_get_id(), GCP_get_tunnel(), GCT_2s(), GCT_add_channel(), 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_STATISTICS_update(), GNUNET_YES, GSC_2s(), CadetChannel::h_port, CadetChannel::is_loopback, LOG, loose_channels, CadetChannel::max_pending_messages, ChannelMessageIdentifier::mid, CadetChannel::mid_recv, my_full_id, CadetChannel::nobuffer, op, open_ports, CadetChannel::out_of_order, CadetChannel::owner, port, OpenPort::port, CadetChannel::port, CadetChannel::reliable, CadetChannel::retry_time, CadetChannel::state, stats, and CadetChannel::t.

Referenced by handle_channel_create().

639 {
640  struct CadetChannel *ch;
641  struct CadetChannelClient *ccco;
642 
643  ccco = GNUNET_new (struct CadetChannelClient);
644  ccco->c = owner;
645  ccco->ccn = ccn;
646  ccco->client_ready = GNUNET_YES;
647 
648  ch = GNUNET_new (struct CadetChannel);
649  ch->mid_recv.mid = htonl (1); /* The OPEN_ACK counts as message 0! */
650  ch->nobuffer = GNUNET_NO;
651  ch->reliable = GNUNET_YES;
652  ch->out_of_order = GNUNET_NO;
654  (ch->nobuffer) ? 1 : 4; /* FIXME: 4!? Do not hardcode! */
655  ch->owner = ccco;
656  ch->port = *port;
657  GCCH_hash_port (&ch->h_port, port, GCP_get_id (destination));
658  if (0 == GNUNET_memcmp (&my_full_id, GCP_get_id (destination)))
659  {
660  struct OpenPort *op;
661 
662  ch->is_loopback = GNUNET_YES;
664  if (NULL == op)
665  {
666  /* port closed, wait for it to possibly open */
670  &ch->h_port,
671  ch,
674  "Created loose incoming loopback channel to port %s\n",
675  GNUNET_h2s (&ch->port));
676  }
677  else
678  {
679  GCCH_bind (ch, op->c, &op->port);
680  }
681  }
682  else
683  {
684  ch->t = GCP_get_tunnel (destination, GNUNET_YES);
686  ch->ctn = GCT_add_channel (ch->t, ch);
687  }
688  GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
690  "Created channel to port %s at peer %s for %s using %s\n",
691  GNUNET_h2s (port),
692  GCP_2s (destination),
693  GSC_2s (owner),
694  (GNUNET_YES == ch->is_loopback) ? "loopback" : GCT_2s (ch->t));
695  return ch;
696 }
int out_of_order
Is the tunnel out-of-order?
static struct GNUNET_CADET_Channel * ch
Channel handle.
Definition: gnunet-cadet.c:117
enum CadetChannelState state
Channel state.
struct CadetTunnel * GCP_get_tunnel(struct CadetPeer *cp, int create)
Get the tunnel towards a peer.
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
struct GNUNET_PeerIdentity my_full_id
Local peer own ID.
struct CadetChannelClient * owner
Client owner of the tunnel, if any.
uint32_t mid
Unique ID of the message, cycles around, in NBO.
int is_loopback
Is this channel a loopback channel, where the destination is us again?
#define CADET_INITIAL_RETRANSMIT_TIME
How long do we initially wait before retransmitting?
unsigned int max_pending_messages
Maximum (reliable) messages pending ACK for this channel before we throttle the client.
int nobuffer
Is the tunnel bufferless (minimum latency)?
#define GNUNET_NO
Definition: gnunet_common.h:78
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
#define GNUNET_new(type)
Allocate a struct or union of the given type.
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 pee...
struct ChannelMessageIdentifier mid_recv
Next MID expected for incoming traffic.
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
const char * GCP_2s(const struct CadetPeer *cp)
Get the static string for a peer ID.
void * GNUNET_CONTAINER_multihashmap_get(const struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key)
Given a key find a value in the map matching the key.
struct GNUNET_CONTAINER_MultiHashMap * open_ports
All ports clients of this peer have opened.
int reliable
Is the tunnel reliable?
struct GNUNET_CONTAINER_MultiHashMap * loose_channels
Map from ports to channels where the ports were closed at the time we got the inbound connection...
struct CadetTunnel * t
Tunnel this channel is in.
#define LOG(level,...)
struct GNUNET_STATISTICS_Handle * stats
Handle to the statistics service.
Struct containing all information regarding a channel to a remote client.
Channel is to a port that is not open, we're waiting for the port to be opened.
struct GNUNET_TIME_Relative retry_time
Counter for exponential backoff.
struct GNUNET_CADET_ClientChannelNumber ccn
Local tunnel number for this client.
struct GNUNET_HashCode port
Port number.
struct GNUNET_CADET_ChannelTunnelNumber GCT_add_channel(struct CadetTunnel *t, struct CadetChannel *ch)
Add a channel to a tunnel, and notify channel that we are ready for transmission if we are already up...
struct GNUNET_CADET_ChannelTunnelNumber ctn
Number identifying this channel in its tunnel.
int client_ready
Can we send data to the client?
int GNUNET_CONTAINER_multihashmap_put(struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
Allow multiple values with the same key.
struct GNUNET_HashCode h_port
Hash'ed port of the channel with initiator and destination PID.
static uint16_t port
Port number.
Definition: gnunet-bcd.c:81
Client endpoint of a struct CadetChannel.
const char * GSC_2s(struct CadetClient *c)
Return identifier for a client as a string.
struct CadetClient * c
Client handle.
#define GNUNET_YES
Definition: gnunet_common.h:77
static struct GNUNET_ARM_Operation * op
Current operation.
Definition: gnunet-arm.c:144
struct CadetClient * c
Client that opened the port.
Port opened by a client.
const struct GNUNET_PeerIdentity * GCP_get_id(struct CadetPeer *cp)
Obtain the peer identity for a struct CadetPeer.
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.
struct GNUNET_HashCode port
Destination port of the channel.
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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
chopen incoming channel
cclient listening on the respective port
portport number c is listening on

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

Parameters
chopen incoming channel
cclient listening on the respective port
portthe port is listening on

Definition at line 931 of file gnunet-service-cadet_channel.c.

References CadetChannelClient::c, CADET_CHANNEL_OPEN_SENT, CADET_CHANNEL_READY, CadetChannelClient::ccn, GNUNET_CADET_ClientChannelNumber::channel_of_client, CadetChannelClient::client_ready, CadetChannel::dest, 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_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_YES, GSC_2s(), GSC_bind(), CadetChannel::is_loopback, LOG, CadetChannel::max_pending_messages, ChannelMessageIdentifier::mid, CadetChannel::mid_recv, my_full_id, options, port, CadetChannel::port, CadetChannel::retry_control_task, send_ack_to_client(), send_open_ack(), CadetChannel::state, and CadetChannel::t.

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

934 {
935  uint32_t options;
936  struct CadetChannelClient *cccd;
937 
939  "Binding %s from %s to port %s of %s\n",
940  GCCH_2s (ch),
941  GCT_2s (ch->t),
942  GNUNET_h2s (&ch->port),
943  GSC_2s (c));
944  if (NULL != ch->retry_control_task)
945  {
946  /* there might be a timeout task here */
948  ch->retry_control_task = NULL;
949  }
950  options = 0;
951  cccd = GNUNET_new (struct CadetChannelClient);
952  GNUNET_assert (NULL == ch->dest);
953  ch->dest = cccd;
954  ch->port = *port;
955  cccd->c = c;
956  cccd->client_ready = GNUNET_YES;
957  cccd->ccn = GSC_bind (c,
958  ch,
959  (GNUNET_YES == ch->is_loopback)
961  : GCT_get_destination (ch->t),
962  port,
963  options);
964  GNUNET_assert (ntohl (cccd->ccn.channel_of_client) <
966  ch->mid_recv.mid = htonl (1); /* The OPEN counts as message 0! */
967  if (GNUNET_YES == ch->is_loopback)
968  {
970  GCCH_handle_channel_open_ack (ch, NULL, port);
971  }
972  else
973  {
974  /* notify other peer that we accepted the connection */
977  }
978  /* give client it's initial supply of ACKs */
979  GNUNET_assert (ntohl (cccd->ccn.channel_of_client) <
981  for (unsigned int i = 0; i < ch->max_pending_messages; i++)
983 }
Connection confirmed, ready to carry traffic.
enum CadetChannelState state
Channel state.
struct CadetPeer * GCT_get_destination(struct CadetTunnel *t)
Return the peer to which this tunnel goes.
uint32_t channel_of_client
Values for channel numbering.
Definition: cadet.h:111
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
struct GNUNET_PeerIdentity my_full_id
Local peer own ID.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static void send_ack_to_client(struct CadetChannel *ch, int to_owner)
Send a GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK to the client to solicit more messages.
uint32_t mid
Unique ID of the message, cycles around, in NBO.
int is_loopback
Is this channel a loopback channel, where the destination is us again?
struct CadetChannelClient * dest
Client destination of the tunnel, if any.
unsigned int max_pending_messages
Maximum (reliable) messages pending ACK for this channel before we throttle the client.
#define GNUNET_NO
Definition: gnunet_common.h:78
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
#define GNUNET_new(type)
Allocate a struct or union of the given type.
struct ChannelMessageIdentifier mid_recv
Next MID expected for incoming traffic.
struct CadetTunnel * t
Tunnel this channel is in.
#define LOG(level,...)
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1280
struct GNUNET_CADET_ClientChannelNumber ccn
Local tunnel number for this client.
#define GNUNET_CADET_LOCAL_CHANNEL_ID_CLI
Minimum value for channel IDs of local clients.
Definition: cadet.h:71
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)...
CHANNEL_OPEN message sent, waiting for CHANNEL_OPEN_ACK.
int client_ready
Can we send data to the client?
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
static uint16_t port
Port number.
Definition: gnunet-bcd.c:81
struct CadetPeer * GCP_get(const struct GNUNET_PeerIdentity *peer_id, int create)
Retrieve the CadetPeer stucture associated with the peer.
Client endpoint of a struct CadetChannel.
const char * GSC_2s(struct CadetClient *c)
Return identifier for a client as a string.
struct CadetClient * c
Client handle.
#define GNUNET_YES
Definition: gnunet_common.h:77
static void send_open_ack(void *cls)
Send our initial GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK to the client confirming that the connect...
struct GNUNET_SCHEDULER_Task * retry_control_task
Task to resend/poll in case no ACK is received.
struct GNUNET_CADET_ClientChannelNumber GSC_bind(struct CadetClient *c, struct CadetChannel *ch, struct CadetPeer *dest, const struct GNUNET_HashCode *port, uint32_t options)
Bind incoming channel to this client, and notify client about incoming connection.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:966
struct GNUNET_HashCode port
Destination port of the channel.
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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
chchannel to destroy
cclient that caused the destruction
ccnclient number of the client c

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

References CadetChannelClient::c, CADET_CHANNEL_LOOSE, CADET_CHANNEL_NEW, CadetChannelClient::ccn, channel_destroy(), GNUNET_CADET_ClientChannelNumber::channel_of_client, CadetChannel::ctn, CadetChannel::dest, CadetChannel::destroy, 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(), CadetChannel::head_sent, CadetChannel::is_loopback, LOG, CadetChannel::owner, CadetChannel::retry_control_task, signal_remote_destroy_cb(), CadetChannel::state, and CadetChannel::t.

Referenced by channel_destroy_iterator(), and handle_channel_destroy().

1019 {
1021  "%s asks for destruction of %s\n",
1022  GSC_2s (c),
1023  GCCH_2s (ch));
1024  GNUNET_assert (NULL != c);
1025  if ((NULL != ch->owner) && (c == ch->owner->c) &&
1027  {
1028  free_channel_client (ch->owner);
1029  ch->owner = NULL;
1030  }
1031  else if ((NULL != ch->dest) && (c == ch->dest->c) &&
1033  {
1034  free_channel_client (ch->dest);
1035  ch->dest = NULL;
1036  }
1037  else
1038  {
1039  GNUNET_assert (0);
1040  }
1041 
1042  if (GNUNET_YES == ch->destroy)
1043  {
1044  /* other end already destroyed, with the local client gone, no need
1045  to finish transmissions, just destroy immediately. */
1046  channel_destroy (ch);
1047  return;
1048  }
1049  if ((NULL != ch->head_sent) && ((NULL != ch->owner) || (NULL != ch->dest)))
1050  {
1051  /* Wait for other end to destroy us as well,
1052  and otherwise allow send queue to be transmitted first */
1053  ch->destroy = GNUNET_YES;
1054  return;
1055  }
1056  if ((GNUNET_YES == ch->is_loopback) &&
1057  ((NULL != ch->owner) || (NULL != ch->dest)))
1058  {
1059  if (NULL != ch->retry_control_task)
1061  ch->retry_control_task =
1063  return;
1064  }
1065  if (GNUNET_NO == ch->is_loopback)
1066  {
1067  /* If the we ever sent the CHANNEL_CREATE, we need to send a destroy message. */
1068  switch (ch->state)
1069  {
1070  case CADET_CHANNEL_NEW:
1071  /* We gave up on a channel that we created as a client to a remote
1072  target, but that never went anywhere. Nothing to do here. */
1073  break;
1074 
1075  case CADET_CHANNEL_LOOSE:
1076  break;
1077 
1078  default:
1079  GCT_send_channel_destroy (ch->t, ch->ctn);
1080  }
1081  }
1082  /* Nothing left to do, just finish destruction */
1083  channel_destroy (ch);
1084 }
struct CadetReliableMessage * head_sent
Head of DLL of messages sent and not yet ACK&#39;d.
enum CadetChannelState state
Channel state.
static void channel_destroy(struct CadetChannel *ch)
Destroy the given channel.
uint32_t channel_of_client
Values for channel numbering.
Definition: cadet.h:111
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct CadetChannelClient * owner
Client owner of the tunnel, if any.
int is_loopback
Is this channel a loopback channel, where the destination is us again?
struct CadetChannelClient * dest
Client destination of the tunnel, if any.
Uninitialized status, should never appear in operation.
#define GNUNET_NO
Definition: gnunet_common.h:78
static void signal_remote_destroy_cb(void *cls)
One of our clients has disconnected, tell the other one that we are finished.
void GCT_send_channel_destroy(struct CadetTunnel *t, struct GNUNET_CADET_ChannelTunnelNumber ctn)
Send a DESTROY message via the tunnel.
static void free_channel_client(struct CadetChannelClient *ccc)
Release memory associated with ccc.
struct CadetTunnel * t
Tunnel this channel is in.
#define LOG(level,...)
Channel is to a port that is not open, we&#39;re waiting for the port to be opened.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1280
struct GNUNET_CADET_ClientChannelNumber ccn
Local tunnel number for this client.
struct GNUNET_CADET_ChannelTunnelNumber ctn
Number identifying this channel in its tunnel.
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
int destroy
Flag to signal the destruction of the channel.
const char * GSC_2s(struct CadetClient *c)
Return identifier for a client as a string.
struct CadetClient * c
Client handle.
#define GNUNET_YES
Definition: gnunet_common.h:77
struct GNUNET_SCHEDULER_Task * retry_control_task
Task to resend/poll in case no ACK is received.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:966
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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
chthe channel for which the tunnel is now ready

Definition at line 613 of file gnunet-service-cadet_channel.c.

References GCCH_2s(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_now(), LOG, CadetChannel::retry_control_task, and send_channel_open().

Referenced by GCT_add_channel(), and notify_tunnel_up_cb().

614 {
615  GNUNET_assert (NULL == ch->retry_control_task);
617  "Tunnel up, sending CHANNEL_OPEN on %s now\n",
618  GCCH_2s (ch));
620 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define LOG(level,...)
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1280
static void send_channel_open(void *cls)
Send a channel create message.
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
struct GNUNET_SCHEDULER_Task * retry_control_task
Task to resend/poll in case no ACK is received.
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◆ GCCH_channel_incoming_new()

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

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

Parameters
ttunnel to the remote peer
chididentifier of this channel in the tunnel
originpeer to who initiated the channel
h_porthash of desired local port
optionsoptions for the channel
Returns
handle to the new channel
Parameters
ttunnel to the remote peer
ctnidentifier of this channel in the tunnel
h_portdesired hash of local port
optionsoptions for the channel
Returns
handle to the new channel

Definition at line 729 of file gnunet-service-cadet_channel.c.

References OpenPort::c, CADET_CHANNEL_LOOSE, CADET_INITIAL_RETRANSMIT_TIME, CadetReliableMessage::ch, CadetChannel::ctn, 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, CadetChannel::h_port, LOG, loose_channels, CadetChannel::max_pending_messages, CadetChannel::nobuffer, op, open_ports, CadetChannel::out_of_order, OpenPort::port, CadetChannel::port, CadetChannel::reliable, CadetChannel::retry_control_task, CadetChannel::retry_time, CadetChannel::state, stats, t, CadetChannel::t, timeout_closed_cb(), and TIMEOUT_CLOSED_PORT.

Referenced by handle_plaintext_channel_open().

733 {
734  struct CadetChannel *ch;
735  struct OpenPort *op;
736 
737  ch = GNUNET_new (struct CadetChannel);
738  ch->h_port = *h_port;
739  ch->t = t;
740  ch->ctn = ctn;
742  ch->nobuffer = GNUNET_NO;
743  ch->reliable = GNUNET_YES;
744  ch->out_of_order = GNUNET_NO;
746  (ch->nobuffer) ? 1 : 4; /* FIXME: 4!? Do not hardcode! */
747  GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
748 
750  if (NULL == op)
751  {
752  /* port closed, wait for it to possibly open */
756  &ch->h_port,
757  ch,
759  GNUNET_assert (NULL == ch->retry_control_task);
762  ch);
764  "Created loose incoming channel to port %s from peer %s\n",
765  GNUNET_h2s (&ch->port),
766  GCP_2s (GCT_get_destination (ch->t)));
767  }
768  else
769  {
770  GCCH_bind (ch, op->c, &op->port);
771  }
772  GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
773  return ch;
774 }
int out_of_order
Is the tunnel out-of-order?
static struct GNUNET_CADET_Channel * ch
Channel handle.
Definition: gnunet-cadet.c:117
enum CadetChannelState state
Channel state.
struct CadetPeer * GCT_get_destination(struct CadetTunnel *t)
Return the peer to which this tunnel goes.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define CADET_INITIAL_RETRANSMIT_TIME
How long do we initially wait before retransmitting?
unsigned int max_pending_messages
Maximum (reliable) messages pending ACK for this channel before we throttle the client.
int nobuffer
Is the tunnel bufferless (minimum latency)?
#define GNUNET_NO
Definition: gnunet_common.h:78
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
#define GNUNET_new(type)
Allocate a struct or union of the given type.
static struct GNUNET_SCHEDULER_Task * t
Main task.
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
const char * GCP_2s(const struct CadetPeer *cp)
Get the static string for a peer ID.
void * GNUNET_CONTAINER_multihashmap_get(const struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key)
Given a key find a value in the map matching the key.
struct GNUNET_CONTAINER_MultiHashMap * open_ports
All ports clients of this peer have opened.
int reliable
Is the tunnel reliable?
struct GNUNET_CONTAINER_MultiHashMap * loose_channels
Map from ports to channels where the ports were closed at the time we got the inbound connection...
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1253
struct CadetTunnel * t
Tunnel this channel is in.
#define LOG(level,...)
struct GNUNET_HashCode h_port
Port hashed with our PID (matches incoming OPEN messages).
struct GNUNET_STATISTICS_Handle * stats
Handle to the statistics service.
Struct containing all information regarding a channel to a remote client.
Channel is to a port that is not open, we&#39;re waiting for the port to be opened.
struct GNUNET_TIME_Relative retry_time
Counter for exponential backoff.
struct GNUNET_HashCode port
Port number.
#define TIMEOUT_CLOSED_PORT
How long do we wait before dropping state about incoming connection to closed port?
struct GNUNET_CADET_ChannelTunnelNumber ctn
Number identifying this channel in its tunnel.
int GNUNET_CONTAINER_multihashmap_put(struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
Allow multiple values with the same key.
struct GNUNET_HashCode h_port
Hash&#39;ed port of the channel with initiator and destination PID.
#define GNUNET_YES
Definition: gnunet_common.h:77
static void timeout_closed_cb(void *cls)
We had an incoming channel to a port that is closed.
static struct GNUNET_ARM_Operation * op
Current operation.
Definition: gnunet-arm.c:144
struct GNUNET_SCHEDULER_Task * retry_control_task
Task to resend/poll in case no ACK is received.
struct CadetClient * c
Client that opened the port.
Port opened by a client.
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.
struct GNUNET_HashCode port
Destination port of the channel.
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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
chchannel that got the duplicate open
ctiidentifier of the connection that delivered the message

Definition at line 861 of file gnunet-service-cadet_channel.c.

References CadetChannel::dest, GCCH_2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_now(), LOG, CadetChannel::retry_control_task, and send_open_ack().

Referenced by handle_plaintext_channel_open().

864 {
865  if (NULL == ch->dest)
866  {
868  "Ignoring duplicate CHANNEL_OPEN on %s: port is closed\n",
869  GCCH_2s (ch));
870  return;
871  }
872  if (NULL != ch->retry_control_task)
873  {
875  "Ignoring duplicate CHANNEL_OPEN on %s: control message is pending\n",
876  GCCH_2s (ch));
877  return;
878  }
880  "Retransmitting CHANNEL_OPEN_ACK on %s\n",
881  GCCH_2s (ch));
883 }
struct CadetChannelClient * dest
Client destination of the tunnel, if any.
#define LOG(level,...)
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1280
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
static void send_open_ack(void *cls)
Send our initial GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK to the client confirming that the connect...
struct GNUNET_SCHEDULER_Task * retry_control_task
Task to resend/poll in case no ACK is received.
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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.

Parameters
chchannel that got data
ctiidentifier of the connection that delivered the message
msgmessage that was received

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

Parameters
chchannel that got data
ctiidentifier of the connection that delivered the message
msgmessage that was received

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

Definition at line 1197 of file gnunet-service-cadet_channel.c.

References CadetChannelClient::c, GNUNET_CADET_LocalData::ccn, CadetChannelClient::ccn, GNUNET_CADET_ClientChannelNumber::channel_of_client, CadetChannelClient::client_ready, CadetChannel::ctn, data_sent_cb(), delta, CadetChannel::dest, CadetChannel::destroy, 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, GNUNET_CADET_ChannelAppDataMessage::header, is_before(), CadetChannel::is_loopback, LOG, CadetChannel::max_pending_messages, CadetOutOfOrderMessage::mid, GNUNET_CADET_ChannelAppDataMessage::mid, ChannelMessageIdentifier::mid, CadetChannel::mid_futures, CadetChannel::mid_recv, CadetChannelClient::num_recv, CadetChannel::out_of_order, CadetChannel::owner, CadetChannel::reliable, send_channel_data_ack(), GNUNET_MessageHeader::size, stats, CadetChannel::t, and CadetChannelClient::tail_recv.

Referenced by handle_plaintext_data().

1201 {
1202  struct GNUNET_MQ_Envelope *env;
1203  struct GNUNET_CADET_LocalData *ld;
1204  struct CadetChannelClient *ccc;
1205  size_t payload_size;
1206  struct CadetOutOfOrderMessage *com;
1207  int duplicate;
1208  uint32_t mid_min;
1209  uint32_t mid_max;
1210  uint32_t mid_msg;
1211  uint32_t delta;
1212 
1214  if ((NULL == ch->owner) && (NULL == ch->dest))
1215  {
1216  /* This client is gone, but we still have messages to send to
1217  the other end (which is why @a ch is not yet dead). However,
1218  we cannot pass messages to our client anymore. */
1220  "Dropping incoming payload on %s as this end is already closed\n",
1221  GCCH_2s (ch));
1222  /* send back DESTROY notification to stop further retransmissions! */
1223  if (GNUNET_YES == ch->destroy)
1224  GCT_send_channel_destroy (ch->t, ch->ctn);
1225  return;
1226  }
1227  payload_size = ntohs (msg->header.size) - sizeof(*msg);
1228  env = GNUNET_MQ_msg_extra (ld,
1229  payload_size,
1231  ld->ccn = (NULL == ch->dest) ? ch->owner->ccn : ch->dest->ccn;
1232  GNUNET_memcpy (&ld[1], &msg[1], payload_size);
1233  ccc = (NULL != ch->owner) ? ch->owner : ch->dest;
1234  if (GNUNET_YES == ccc->client_ready)
1235  {
1236  /*
1237  * We ad-hoc send the message if
1238  * - The channel is out-of-order
1239  * - The channel is reliable and MID matches next expected MID
1240  * - The channel is unreliable and MID is before lowest seen MID
1241  */if ((GNUNET_YES == ch->out_of_order) ||
1242  ((msg->mid.mid == ch->mid_recv.mid) && (GNUNET_YES == ch->reliable)) ||
1243  ((GNUNET_NO == ch->reliable) &&
1244  (ntohl (msg->mid.mid) >= ntohl (ch->mid_recv.mid)) &&
1245  ((NULL == ccc->head_recv) ||
1246  (ntohl (msg->mid.mid) < ntohl (ccc->head_recv->mid.mid)))))
1247  {
1249  "Giving %u bytes of payload with MID %u from %s to client %s\n",
1250  (unsigned int) payload_size,
1251  ntohl (msg->mid.mid),
1252  GCCH_2s (ch),
1253  GSC_2s (ccc->c));
1254  ccc->client_ready = GNUNET_NO;
1255  GSC_send_to_client (ccc->c, env);
1256  if (GNUNET_NO == ch->out_of_order)
1257  ch->mid_recv.mid = htonl (1 + ntohl (msg->mid.mid));
1258  else
1259  ch->mid_recv.mid = htonl (1 + ntohl (ch->mid_recv.mid));
1260  ch->mid_futures >>= 1;
1261  if ((GNUNET_YES == ch->out_of_order) && (GNUNET_NO == ch->reliable))
1262  {
1263  /* possibly shift by more if we skipped messages */
1264  uint64_t delta = htonl (msg->mid.mid) - 1 - ntohl (ch->mid_recv.mid);
1265 
1266  if (delta > 63)
1267  ch->mid_futures = 0;
1268  else
1269  ch->mid_futures >>= delta;
1270  ch->mid_recv.mid = htonl (1 + ntohl (msg->mid.mid));
1271  }
1272  send_channel_data_ack (ch);
1273  return;
1274  }
1275  }
1276 
1277  if (GNUNET_YES == ch->reliable)
1278  {
1279  /* check if message ought to be dropped because it is ancient/too distant/duplicate */
1280  mid_min = ntohl (ch->mid_recv.mid);
1281  mid_max = mid_min + ch->max_pending_messages;
1282  mid_msg = ntohl (msg->mid.mid);
1283  if (((uint32_t) (mid_msg - mid_min) > ch->max_pending_messages) ||
1284  ((uint32_t) (mid_max - mid_msg) > ch->max_pending_messages))
1285  {
1287  "%s at %u drops ancient or far-future message %u\n",
1288  GCCH_2s (ch),
1289  (unsigned int) mid_min,
1290  ntohl (msg->mid.mid));
1291 
1293  "# duplicate DATA (ancient or future)",
1294  1,
1295  GNUNET_NO);
1296  GNUNET_MQ_discard (env);
1297  send_channel_data_ack (ch);
1298  return;
1299  }
1300  /* mark bit for future ACKs */
1301  delta = mid_msg - mid_min - 1; /* overflow/underflow are OK here */
1302  if (delta < 64)
1303  {
1304  if (0 != (ch->mid_futures & (1LLU << delta)))
1305  {
1306  /* Duplicate within the queue, drop also */
1308  "Duplicate payload of %u bytes on %s (mid %u) dropped\n",
1309  (unsigned int) payload_size,
1310  GCCH_2s (ch),
1311  ntohl (msg->mid.mid));
1312  GNUNET_STATISTICS_update (stats, "# duplicate DATA", 1, GNUNET_NO);
1313  GNUNET_MQ_discard (env);
1314  send_channel_data_ack (ch);
1315  return;
1316  }
1317  ch->mid_futures |= (1LLU << delta);
1319  "Marked bit %llX for mid %u (base: %u); now: %llX\n",
1320  (1LLU << delta),
1321  mid_msg,
1322  mid_min,
1323  ch->mid_futures);
1324  }
1325  }
1326  else /* ! ch->reliable */
1327  {
1328  struct CadetOutOfOrderMessage *next_msg;
1329 
1334  if ((NULL != ccc->head_recv) && (GNUNET_YES == ccc->client_ready))
1335  {
1336  next_msg = ccc->head_recv;
1338  "Giving queued MID %u from %s to client %s\n",
1339  ntohl (next_msg->mid.mid),
1340  GCCH_2s (ch),
1341  GSC_2s (ccc->c));
1342  ccc->client_ready = GNUNET_NO;
1343  GSC_send_to_client (ccc->c, next_msg->env);
1344  ch->mid_recv.mid = htonl (1 + ntohl (next_msg->mid.mid));
1345  ch->mid_futures >>= 1;
1346  send_channel_data_ack (ch);
1347  GNUNET_CONTAINER_DLL_remove (ccc->head_recv, ccc->tail_recv, next_msg);
1348  ccc->num_recv--;
1349  /* Do not process duplicate MID */
1350  if (msg->mid.mid == next_msg->mid.mid) /* Duplicate */
1351  {
1352  /* Duplicate within the queue, drop */
1354  "Message on %s (mid %u) dropped, duplicate\n",
1355  GCCH_2s (ch),
1356  ntohl (msg->mid.mid));
1357  GNUNET_free (next_msg);
1358  GNUNET_MQ_discard (env);
1359  return;
1360  }
1361  GNUNET_free (next_msg);
1362  }
1363 
1364  if (ntohl (msg->mid.mid) < ntohl (ch->mid_recv.mid)) /* Old */
1365  {
1366  /* Duplicate within the queue, drop */
1368  "Message on %s (mid %u) dropped, old.\n",
1369  GCCH_2s (ch),
1370  ntohl (msg->mid.mid));
1371  GNUNET_MQ_discard (env);
1372  return;
1373  }
1374 
1375  /* Channel is unreliable, so we do not ACK. But we also cannot
1376  allow buffering everything, so check if we have space... */
1377  if (ccc->num_recv >= ch->max_pending_messages)
1378  {
1379  struct CadetOutOfOrderMessage *drop;
1380 
1381  /* Yep, need to drop. Drop the oldest message in
1382  the buffer. */
1384  "Queue full due slow client on %s, dropping oldest message\n",
1385  GCCH_2s (ch));
1387  "# messages dropped due to slow client",
1388  1,
1389  GNUNET_NO);
1390  drop = ccc->head_recv;
1391  GNUNET_assert (NULL != drop);
1392  GNUNET_CONTAINER_DLL_remove (ccc->head_recv, ccc->tail_recv, drop);
1393  ccc->num_recv--;
1394  GNUNET_MQ_discard (drop->env);
1395  GNUNET_free (drop);
1396  }
1397  }
1398 
1399  /* Insert message into sorted out-of-order queue */
1400  com = GNUNET_new (struct CadetOutOfOrderMessage);
1401  com->mid = msg->mid;
1402  com->env = env;
1403  duplicate = GNUNET_NO;
1405  is_before,
1406  &duplicate,
1407  ccc->head_recv,
1408  ccc->tail_recv,
1409  com);
1410  ccc->num_recv++;
1411  if (GNUNET_YES == duplicate)
1412  {
1413  /* Duplicate within the queue, drop also (this is not covered by
1414  the case above if "delta" >= 64, which could be the case if
1415  max_pending_messages is also >= 64 or if our client is unready
1416  and we are seeing retransmissions of the message our client is
1417  blocked on. */LOG (GNUNET_ERROR_TYPE_DEBUG,
1418  "Duplicate payload of %u bytes on %s (mid %u) dropped\n",
1419  (unsigned int) payload_size,
1420  GCCH_2s (ch),
1421  ntohl (msg->mid.mid));
1422  GNUNET_STATISTICS_update (stats, "# duplicate DATA", 1, GNUNET_NO);
1424  ccc->num_recv--;
1425  GNUNET_MQ_discard (com->env);
1426  GNUNET_free (com);
1427  send_channel_data_ack (ch);
1428  return;
1429  }
1431  "Queued %s payload of %u bytes on %s-%X(%p) (mid %u, need %u first)\n",
1432  (GNUNET_YES == ccc->client_ready) ? "out-of-order" : "client-not-ready",
1433  (unsigned int) payload_size,
1434  GCCH_2s (ch),
1435  ntohl (ccc->ccn.channel_of_client),
1436  ccc,
1437  ntohl (msg->mid.mid),
1438  ntohl (ch->mid_recv.mid));
1439  /* NOTE: this ACK we _could_ skip, as the packet is out-of-order and
1440  the sender may already be transmitting the previous one. Needs
1441  experimental evaluation to see if/when this ACK helps or
1442  hurts. (We might even want another option.) */
1443  send_channel_data_ack (ch);
1444 }
int out_of_order
Is the tunnel out-of-order?
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
static int is_before(void *cls, struct CadetOutOfOrderMessage *m1, struct CadetOutOfOrderMessage *m2)
Test if element e1 comes before element e2.
static struct GNUNET_TIME_Relative delta
Definition: speedup.c:35
uint32_t channel_of_client
Values for channel numbering.
Definition: cadet.h:111
#define GNUNET_CONTAINER_DLL_insert_sorted(TYPE, comparator, comparator_cls, head, tail, element)
Insertion sort of element into DLL from head to tail sorted by comparator.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct CadetChannelClient * owner
Client owner of the tunnel, if any.
uint32_t mid
Unique ID of the message, cycles around, in NBO.
int is_loopback
Is this channel a loopback channel, where the destination is us again?
struct CadetChannelClient * dest
Client destination of the tunnel, if any.
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
unsigned int max_pending_messages
Maximum (reliable) messages pending ACK for this channel before we throttle the client.
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_new(type)
Allocate a struct or union of the given type.
List of received out-of-order data messages.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
struct ChannelMessageIdentifier mid_recv
Next MID expected for incoming traffic.
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
struct GNUNET_MQ_Envelope * env
The envelope with the payload of the out-of-order message.
unsigned int num_recv
Number of entries currently in head_recv DLL.
void GCT_send_channel_destroy(struct CadetTunnel *t, struct GNUNET_CADET_ChannelTunnelNumber ctn)
Send a DESTROY message via the tunnel.
int reliable
Is the tunnel reliable?
#define GNUNET_MQ_msg_extra(mvar, esize, type)
Allocate an envelope, with extra space allocated after the space needed by the message struct...
Definition: gnunet_mq_lib.h:52
struct CadetTunnel * t
Tunnel this channel is in.
#define LOG(level,...)
struct CadetOutOfOrderMessage * tail_recv
Tail DLL of messages received out of order or while client was unready.
struct GNUNET_STATISTICS_Handle * stats
Handle to the statistics service.
struct GNUNET_CADET_ClientChannelNumber ccn
Local tunnel number for this client.
struct GNUNET_CADET_ClientChannelNumber ccn
ID of the channel.
Definition: cadet.h:199
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA.
void GNUNET_MQ_discard(struct GNUNET_MQ_Envelope *mqm)
Discard the message queue message, free all allocated resources.
Definition: mq.c:321
struct GNUNET_CADET_ChannelTunnelNumber ctn
Number identifying this channel in its tunnel.
int client_ready
Can we send data to the client?
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
int destroy
Flag to signal the destruction of the channel.
struct ChannelMessageIdentifier mid
Unique ID of the payload message.
#define GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA
Payload client <-> service.
Client endpoint of a struct CadetChannel.
const char * GSC_2s(struct CadetClient *c)
Return identifier for a client as a string.
struct CadetClient * c
Client handle.
void GSC_send_to_client(struct CadetClient *c, struct GNUNET_MQ_Envelope *env)
Send a message to a client.
static void send_channel_data_ack(struct CadetChannel *ch)
Compute and send the current GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK to the other peer...
#define GNUNET_YES
Definition: gnunet_common.h:77
Message for cadet data traffic.
Definition: cadet.h:189
struct ChannelMessageIdentifier mid
ID of the message (messages up to this point needed before we give this one to the client)...
struct CadetOutOfOrderMessage * head_recv
Head of DLL of messages received out of order or while client was unready.
#define GNUNET_free(ptr)
Wrapper around free.
uint64_t mid_futures
Bitfield of already-received messages past mid_recv.
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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
chchannel that got the ack
ctiidentifier of the connection that delivered the message
ackdetails about what was received

Definition at line 1536 of file gnunet-service-cadet_channel.c.

References 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(), CadetChannel::head_sent, CadetChannel::is_loopback, LOG, CadetChannel::max_pending_messages, ChannelMessageIdentifier::mid, GNUNET_CADET_ChannelAppDataMessage::mid, GNUNET_CADET_ChannelDataAckMessage::mid, CadetReliableMessage::next, CadetReliableMessage::next_retry, CadetReliableMessage::qe, CadetChannel::reliable, CadetChannel::retry_data_task, retry_transmission(), and stats.

Referenced by handle_plaintext_data_ack().

1540 {
1541  struct CadetReliableMessage *crm;
1542  struct CadetReliableMessage *crmn;
1543  int found;
1544  uint32_t mid_base;
1545  uint64_t mid_mask;
1546  unsigned int delta;
1547 
1549  if (GNUNET_NO == ch->reliable)
1550  {
1551  /* not expecting ACKs on unreliable channel, odd */
1552  GNUNET_break_op (0);
1553  return;
1554  }
1555  /* mid_base is the MID of the next message that the
1556  other peer expects (i.e. that is missing!), everything
1557  LOWER (but excluding mid_base itself) was received. */
1558  mid_base = ntohl (ack->mid.mid);
1559  mid_mask = GNUNET_htonll (ack->futures);
1560  found = GNUNET_NO;
1561  for (crm = ch->head_sent; NULL != crm; crm = crmn)
1562  {
1563  crmn = crm->next;
1564  delta = (unsigned int) (ntohl (crm->data_message->mid.mid) - mid_base);
1565  if (delta >= UINT_MAX - ch->max_pending_messages)
1566  {
1567  /* overflow, means crm was a bit in the past, so this ACK counts for it. */
1569  "Got DATA_ACK with base %u satisfying past message %u on %s\n",
1570  (unsigned int) mid_base,
1571  ntohl (crm->data_message->mid.mid),
1572  GCCH_2s (ch));
1573  handle_matching_ack (ch, cti, crm);
1574  found = GNUNET_YES;
1575  continue;
1576  }
1577  delta--;
1578  if (delta >= 64)
1579  continue;
1581  "Testing bit %llX for mid %u (base: %u)\n",
1582  (1LLU << delta),
1583  ntohl (crm->data_message->mid.mid),
1584  mid_base);
1585  if (0 != (mid_mask & (1LLU << delta)))
1586  {
1588  "Got DATA_ACK with mask for %u on %s\n",
1589  ntohl (crm->data_message->mid.mid),
1590  GCCH_2s (ch));
1591  handle_matching_ack (ch, cti, crm);
1592  found = GNUNET_YES;
1593  }
1594  }
1595  if (GNUNET_NO == found)
1596  {
1597  /* ACK for message we already dropped, might have been a
1598  duplicate ACK? Ignore. */
1600  "Duplicate DATA_ACK on %s, ignoring\n",
1601  GCCH_2s (ch));
1602  GNUNET_STATISTICS_update (stats, "# duplicate DATA_ACKs", 1, GNUNET_NO);
1603  return;
1604  }
1605  if (NULL != ch->retry_data_task)
1606  {
1608  ch->retry_data_task = NULL;
1609  }
1610  if ((NULL != ch->head_sent) && (NULL == ch->head_sent->qe))
1613  ch);
1614 }
uint64_t futures
Bitfield of already-received newer messages.
struct CadetReliableMessage * head_sent
Head of DLL of messages sent and not yet ACK&#39;d.
Info needed to retry a message in case it gets lost.
static struct GNUNET_TIME_Relative delta
Definition: speedup.c:35
uint32_t mid
Unique ID of the message, cycles around, in NBO.
int is_loopback
Is this channel a loopback channel, where the destination is us again?
struct GNUNET_SCHEDULER_Task * retry_data_task
Task to resend/poll in case no ACK is received.
unsigned int max_pending_messages
Maximum (reliable) messages pending ACK for this channel before we throttle the client.
#define GNUNET_NO
Definition: gnunet_common.h:78
static void retry_transmission(void *cls)
We need to retry a transmission, the last one took too long to be acknowledged.
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
int reliable
Is the tunnel reliable?
static void handle_matching_ack(struct CadetChannel *ch, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cti, struct CadetReliableMessage *crm)
We got an PLAINTEXT_DATA_ACK for a message in our queue, remove it from the queue and tell our client...
#define LOG(level,...)
struct GNUNET_TIME_Absolute next_retry
How soon should we retry if we fail to get an ACK? Messages in the queue are sorted by this value...
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
struct GNUNET_STATISTICS_Handle * stats
Handle to the statistics service.
struct GNUNET_CADET_ChannelAppDataMessage * data_message
Data message we are trying to send.
struct ChannelMessageIdentifier mid
Next message ID expected.
uint64_t GNUNET_htonll(uint64_t n)
Convert unsigned 64-bit integer to network byte order.
Definition: common_endian.c:35
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
struct CadetReliableMessage * next
Double linked list, FIFO style.
struct ChannelMessageIdentifier mid
Unique ID of the payload message.
struct CadetTunnelQueueEntry * qe
Entry in the tunnels queue for this message, NULL if it has left the tunnel.
#define GNUNET_YES
Definition: gnunet_common.h:77
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_at(struct GNUNET_TIME_Absolute at, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run at the specified time.
Definition: scheduler.c:1230
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:966
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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).

Begin transmissions.

Parameters
chchannel to destroy
ctiidentifier of the connection that delivered the message, NULL if the ACK was inferred because we got payload or are on loopback
portport number (needed to verify receiver knows the port)

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

Parameters
chchannel to destroy
ctiidentifier of the connection that delivered the message
portport number (needed to verify receiver knows the port)

Definition at line 1097 of file gnunet-service-cadet_channel.c.

References CADET_CHANNEL_LOOSE, CADET_CHANNEL_NEW, CADET_CHANNEL_OPEN_SENT, CADET_CHANNEL_READY, GCCH_2s(), GNUNET_break, GNUNET_break_op, GNUNET_ERROR_TYPE_DEBUG, GNUNET_memcmp, GNUNET_NO, GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_update(), GNUNET_YES, LOG, CadetChannel::max_pending_messages, CadetChannel::owner, CadetChannel::port, CadetChannel::retry_control_task, send_ack_to_client(), CadetChannel::state, and stats.

Referenced by GCCH_bind(), and handle_plaintext_channel_open_ack().

1101 {
1102  switch (ch->state)
1103  {
1104  case CADET_CHANNEL_NEW:
1105  /* this should be impossible */
1106  GNUNET_break (0);
1107  break;
1108 
1109  case CADET_CHANNEL_LOOSE:
1110  /* This makes no sense. */
1111  GNUNET_break_op (0);
1112  break;
1113 
1115  if (NULL == ch->owner)
1116  {
1117  /* We're not the owner, wrong direction! */
1118  GNUNET_break_op (0);
1119  return;
1120  }
1121  if (0 != GNUNET_memcmp (&ch->port, port))
1122  {
1123  /* Other peer failed to provide the right port,
1124  refuse connection. */
1125  GNUNET_break_op (0);
1126  return;
1127  }
1129  "Received CHANNEL_OPEN_ACK for waiting %s, entering READY state\n",
1130  GCCH_2s (ch));
1131  if (NULL != ch->retry_control_task) /* can be NULL if ch->is_loopback */
1132  {
1134  ch->retry_control_task = NULL;
1135  }
1136  ch->state = CADET_CHANNEL_READY;
1137  /* On first connect, send client as many ACKs as we allow messages
1138  to be buffered! */
1139  for (unsigned int i = 0; i < ch->max_pending_messages; i++)
1141  break;
1142 
1143  case CADET_CHANNEL_READY:
1144  /* duplicate ACK, maybe we retried the CREATE. Ignore. */
1146  "Received duplicate channel OPEN_ACK for %s\n",
1147  GCCH_2s (ch));
1148  GNUNET_STATISTICS_update (stats, "# duplicate CREATE_ACKs", 1, GNUNET_NO);
1149  break;
1150  }
1151 }
Connection confirmed, ready to carry traffic.
enum CadetChannelState state
Channel state.
static void send_ack_to_client(struct CadetChannel *ch, int to_owner)
Send a GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK to the client to solicit more messages.
struct CadetChannelClient * owner
Client owner of the tunnel, if any.
Uninitialized status, should never appear in operation.
unsigned int max_pending_messages
Maximum (reliable) messages pending ACK for this channel before we throttle the client.
#define GNUNET_NO
Definition: gnunet_common.h:78
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
#define LOG(level,...)
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
struct GNUNET_STATISTICS_Handle * stats
Handle to the statistics service.
Channel is to a port that is not open, we&#39;re waiting for the port to be opened.
CHANNEL_OPEN message sent, waiting for CHANNEL_OPEN_ACK.
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
#define GNUNET_YES
Definition: gnunet_common.h:77
struct GNUNET_SCHEDULER_Task * retry_control_task
Task to resend/poll in case no ACK is received.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:966
struct GNUNET_HashCode port
Destination port of the channel.
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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
chchannel to destroy
ctiidentifier of the connection that delivered the message, NULL during shutdown

Also needs to remove this channel from the tunnel.

Parameters
chchannel to destroy
ctiidentifier of the connection that delivered the message, NULL if we are simulating receiving a destroy due to shutdown

Definition at line 1627 of file gnunet-service-cadet_channel.c.

References CadetChannelClient::c, CadetChannelClient::ccn, channel_destroy(), CadetChannel::dest, CadetChannel::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, CadetChannel::is_loopback, LOG, and CadetChannel::owner.

Referenced by destroy_remaining_channels(), and handle_plaintext_channel_destroy().

1630 {
1631  struct CadetChannelClient *ccc;
1632 
1635  "Received remote channel DESTROY for %s\n",
1636  GCCH_2s (ch));
1637  if (GNUNET_YES == ch->destroy)
1638  {
1639  /* Local client already gone, this is instant-death. */
1640  channel_destroy (ch);
1641  return;
1642  }
1643  ccc = (NULL != ch->owner) ? ch->owner : ch->dest;
1644  if ((NULL != ccc) && (NULL != ccc->head_recv))
1645  {
1647  "Lost end of transmission due to remote shutdown on %s\n",
1648  GCCH_2s (ch));
1649  /* FIXME: change API to notify client about truncated transmission! */
1650  }
1651  ch->destroy = GNUNET_YES;
1652  if (NULL != ccc)
1653  GSC_handle_remote_channel_destroy (ccc->c, ccc->ccn, ch);
1654  channel_destroy (ch);
1655 }
static void channel_destroy(struct CadetChannel *ch)
Destroy the given channel.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct CadetChannelClient * owner
Client owner of the tunnel, if any.
int is_loopback
Is this channel a loopback channel, where the destination is us again?
struct CadetChannelClient * dest
Client destination of the tunnel, if any.
#define GNUNET_NO
Definition: gnunet_common.h:78
void GSC_handle_remote_channel_destroy(struct CadetClient *c, struct GNUNET_CADET_ClientChannelNumber ccn, struct CadetChannel *ch)
A channel was destroyed by the other peer.
#define LOG(level,...)
struct GNUNET_CADET_ClientChannelNumber ccn
Local tunnel number for this client.
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
int destroy
Flag to signal the destruction of the channel.
Client endpoint of a struct CadetChannel.
struct CadetClient * c
Client handle.
#define GNUNET_YES
Definition: gnunet_common.h:77
struct CadetOutOfOrderMessage * head_recv
Head of DLL of messages received out of order or while client was unready.
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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
chChannel.
sender_ccnccn of the sender
bufpayload to transmit.
buf_lennumber of bytes in buf
Returns
GNUNET_OK if everything goes well, GNUNET_SYSERR in case of an error.

Definition at line 1776 of file gnunet-service-cadet_channel.c.

References CadetChannelClient::c, GNUNET_CADET_LocalData::ccn, CadetChannelClient::ccn, CadetReliableMessage::ch, GNUNET_CADET_ClientChannelNumber::channel_of_client, CadetChannelClient::client_ready, CadetChannel::ctn, GNUNET_CADET_ChannelAppDataMessage::ctn, CadetReliableMessage::data_message, data_sent_cb(), CadetChannel::dest, CadetChannel::destroy, env, CadetOutOfOrderMessage::env, GCCH_2s(), GCT_send(), GNUNET_assert, GNUNET_break, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_ERROR_TYPE_DEBUG, 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(), CadetChannelClient::head_recv, CadetChannel::head_sent, GNUNET_CADET_ChannelAppDataMessage::header, CadetChannel::is_loopback, LOG, CadetChannel::max_pending_messages, ChannelMessageIdentifier::mid, GNUNET_CADET_ChannelAppDataMessage::mid, CadetChannel::mid_send, CadetChannelClient::num_recv, CadetChannel::owner, CadetChannel::pending_messages, CadetReliableMessage::qe, CadetChannel::retry_data_task, send_ack_to_client(), GNUNET_MessageHeader::size, CadetChannel::t, CadetChannelClient::tail_recv, CadetChannel::tail_sent, and GNUNET_MessageHeader::type.

Referenced by handle_local_data().

1780 {
1781  struct CadetReliableMessage *crm;
1782 
1783  if (ch->pending_messages >= ch->max_pending_messages)
1784  {
1785  GNUNET_break (0); /* Fails: #5370 */
1786  return GNUNET_SYSERR;
1787  }
1788  if (GNUNET_YES == ch->destroy)
1789  {
1790  /* we are going down, drop messages */
1791  return GNUNET_OK;
1792  }
1793  ch->pending_messages++;
1794 
1795  if (GNUNET_YES == ch->is_loopback)
1796  {
1797  struct CadetChannelClient *receiver;
1798  struct GNUNET_MQ_Envelope *env;
1799  struct GNUNET_CADET_LocalData *ld;
1800  int ack_to_owner;
1801 
1802  env =
1804  if ((NULL != ch->owner) &&
1805  (sender_ccn.channel_of_client == ch->owner->ccn.channel_of_client))
1806  {
1807  receiver = ch->dest;
1808  ack_to_owner = GNUNET_YES;
1809  }
1810  else if ((NULL != ch->dest) &&
1811  (sender_ccn.channel_of_client == ch->dest->ccn.channel_of_client))
1812  {
1813  receiver = ch->owner;
1814  ack_to_owner = GNUNET_NO;
1815  }
1816  else
1817  {
1818  GNUNET_break (0);
1819  return GNUNET_SYSERR;
1820  }
1821  GNUNET_assert (NULL != receiver);
1822  ld->ccn = receiver->ccn;
1823  GNUNET_memcpy (&ld[1], buf, buf_len);
1824  if (GNUNET_YES == receiver->client_ready)
1825  {
1826  ch->pending_messages--;
1827  GSC_send_to_client (receiver->c, env);
1828  send_ack_to_client (ch, ack_to_owner);
1829  }
1830  else
1831  {
1832  struct CadetOutOfOrderMessage *oom;
1833 
1834  oom = GNUNET_new (struct CadetOutOfOrderMessage);
1835  oom->env = env;
1837  receiver->tail_recv,
1838  oom);
1839  receiver->num_recv++;
1840  }
1841  return GNUNET_OK;
1842  }
1843 
1844  /* Everything is correct, send the message. */
1845  crm = GNUNET_malloc (sizeof(*crm));
1846  crm->ch = ch;
1847  crm->data_message = GNUNET_malloc (
1848  sizeof(struct GNUNET_CADET_ChannelAppDataMessage) + buf_len);
1849  crm->data_message->header.size =
1850  htons (sizeof(struct GNUNET_CADET_ChannelAppDataMessage) + buf_len);
1851  crm->data_message->header.type =
1853  ch->mid_send.mid = htonl (ntohl (ch->mid_send.mid) + 1);
1854  crm->data_message->mid = ch->mid_send;
1855  crm->data_message->ctn = ch->ctn;
1856  GNUNET_memcpy (&crm->data_message[1], buf, buf_len);
1859  "Sending message %u from local client to %s with %u bytes\n",
1860  ntohl (crm->data_message->mid.mid),
1861  GCCH_2s (ch),
1862  buf_len);
1863  if (NULL != ch->retry_data_task)
1864  {
1866  ch->retry_data_task = NULL;
1867  }
1868  crm->qe = GCT_send (ch->t, &crm->data_message->header, &data_sent_cb, crm);
1869  GNUNET_assert (NULL == ch->retry_data_task);
1870  return GNUNET_OK;
1871 }
static struct GNUNET_CADET_Channel * ch
Channel handle.
Definition: gnunet-cadet.c:117
struct CadetChannel * ch
Which channel is this message in?
struct CadetReliableMessage * head_sent
Head of DLL of messages sent and not yet ACK&#39;d.
Info needed to retry a message in case it gets lost.
uint32_t channel_of_client
Values for channel numbering.
Definition: cadet.h:111
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static void send_ack_to_client(struct CadetChannel *ch, int to_owner)
Send a GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK to the client to solicit more messages.
struct CadetTunnelQueueEntry * GCT_send(struct CadetTunnel *t, const struct GNUNET_MessageHeader *message, GCT_SendContinuation cont, void *cont_cls)
Sends an already built message on a tunnel, encrypting it and choosing the best connection if not pro...
struct CadetChannelClient * owner
Client owner of the tunnel, if any.
uint32_t mid
Unique ID of the message, cycles around, in NBO.
int is_loopback
Is this channel a loopback channel, where the destination is us again?
struct CadetChannelClient * dest
Client destination of the tunnel, if any.
struct GNUNET_SCHEDULER_Task * retry_data_task
Task to resend/poll in case no ACK is received.
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
unsigned int max_pending_messages
Maximum (reliable) messages pending ACK for this channel before we throttle the client.
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
#define GNUNET_new(type)
Allocate a struct or union of the given type.
List of received out-of-order data messages.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
struct GNUNET_MQ_Envelope * env
The envelope with the payload of the out-of-order message.
unsigned int num_recv
Number of entries currently in head_recv DLL.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA
Payload data (inside an encrypted tunnel).
#define GNUNET_MQ_msg_extra(mvar, esize, type)
Allocate an envelope, with extra space allocated after the space needed by the message struct...
Definition: gnunet_mq_lib.h:52
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
struct CadetTunnel * t
Tunnel this channel is in.
#define LOG(level,...)
struct CadetOutOfOrderMessage * tail_recv
Tail DLL of messages received out of order or while client was unready.
struct GNUNET_CADET_ClientChannelNumber ccn
Local tunnel number for this client.
struct GNUNET_CADET_ChannelAppDataMessage * data_message
Data message we are trying to send.
static char buf[2048]
Message for cadet data traffic.
unsigned int pending_messages
Total (reliable) messages pending ACK for this channel.
struct GNUNET_CADET_ClientChannelNumber ccn
ID of the channel.
Definition: cadet.h:199
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA.
struct GNUNET_CADET_ChannelTunnelNumber ctn
Number identifying this channel in its tunnel.
#define GNUNET_SYSERR
Definition: gnunet_common.h:76
int client_ready
Can we send data to the client?
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
#define GNUNET_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
int destroy
Flag to signal the destruction of the channel.
struct CadetReliableMessage * tail_sent
Tail of DLL of messages sent and not yet ACK&#39;d.
struct ChannelMessageIdentifier mid
Unique ID of the payload message.
#define GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA
Payload client <-> service.
Client endpoint of a struct CadetChannel.
struct CadetClient * c
Client handle.
void GSC_send_to_client(struct CadetClient *c, struct GNUNET_MQ_Envelope *env)
Send a message to a client.
struct GNUNET_CADET_ChannelTunnelNumber ctn
ID of the channel.
struct CadetTunnelQueueEntry * qe
Entry in the tunnels queue for this message, NULL if it has left the tunnel.
static void data_sent_cb(void *cls, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
Function called once the tunnel has sent one of our messages.
#define GNUNET_YES
Definition: gnunet_common.h:77
Message for cadet data traffic.
Definition: cadet.h:189
struct ChannelMessageIdentifier mid_send
Next MID to use for outgoing traffic.
struct CadetOutOfOrderMessage * head_recv
Head of DLL of messages received out of order or while client was unready.
#define GNUNET_malloc(size)
Wrapper around malloc.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:966
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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.

Parameters
chchannel to destroy
client_ccnccn of the client sending the ack

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

Parameters
chchannel to destroy
client_ccnccn of the client sending the ack

Definition at line 1882 of file gnunet-service-cadet_channel.c.

References CadetChannelClient::c, CadetChannelClient::ccn, channel_destroy(), GNUNET_CADET_ClientChannelNumber::channel_of_client, CadetChannelClient::client_ready, CadetChannel::ctn, CadetChannel::dest, CadetChannel::destroy, 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, CadetChannel::is_loopback, LOG, CadetOutOfOrderMessage::mid, ChannelMessageIdentifier::mid, CadetChannel::mid_futures, CadetChannel::mid_recv, CadetChannelClient::num_recv, CadetChannel::out_of_order, CadetChannel::owner, CadetChannel::reliable, send_ack_to_client(), send_channel_data_ack(), CadetChannel::t, and CadetChannelClient::tail_recv.

Referenced by handle_local_ack().

1884 {
1885  struct CadetChannelClient *ccc;
1886  struct CadetOutOfOrderMessage *com;
1887 
1888  if ((NULL != ch->owner) &&
1889  (ch->owner->ccn.channel_of_client == client_ccn.channel_of_client))
1890  ccc = ch->owner;
1891  else if ((NULL != ch->dest) &&
1892  (ch->dest->ccn.channel_of_client == client_ccn.channel_of_client))
1893  ccc = ch->dest;
1894  else
1895  GNUNET_assert (0);
1896  ccc->client_ready = GNUNET_YES;
1897  com = ccc->head_recv;
1898  if (NULL == com)
1899  {
1901  "Got LOCAL_ACK, %s-%X ready to receive more data, but none pending on %s-%X(%p)!\n",
1902  GSC_2s (ccc->c),
1903  ntohl (client_ccn.channel_of_client),
1904  GCCH_2s (ch),
1905  ntohl (ccc->ccn.channel_of_client),
1906  ccc);
1907  return; /* none pending */
1908  }
1909  if (GNUNET_YES == ch->is_loopback)
1910  {
1911  int to_owner;
1912 
1913  /* Messages are always in-order, just send */
1915  ccc->num_recv--;
1916  GSC_send_to_client (ccc->c, com->env);
1917  /* Notify sender that we can receive more */
1918  if ((NULL != ch->owner) &&
1920  {
1921  to_owner = GNUNET_NO;
1922  }
1923  else
1924  {
1925  GNUNET_assert ((NULL != ch->dest) && (ccc->ccn.channel_of_client ==
1926  ch->dest->ccn.channel_of_client));
1927  to_owner = GNUNET_YES;
1928  }
1929  send_ack_to_client (ch, to_owner);
1930  GNUNET_free (com);
1931  return;
1932  }
1933 
1934  if ((com->mid.mid != ch->mid_recv.mid) && (GNUNET_NO == ch->out_of_order) &&
1935  (GNUNET_YES == ch->reliable))
1936  {
1938  "Got LOCAL_ACK, %s-%X ready to receive more data (but next one is out-of-order %u vs. %u)!\n",
1939  GSC_2s (ccc->c),
1940  ntohl (ccc->ccn.channel_of_client),
1941  ntohl (com->mid.mid),
1942  ntohl (ch->mid_recv.mid));
1943  return; /* missing next one in-order */
1944  }
1945 
1947  "Got LOCAL_ACK, giving payload message %u to %s-%X on %s\n",
1948  ntohl (com->mid.mid),
1949  GSC_2s (ccc->c),
1950  ntohl (ccc->ccn.channel_of_client),
1951  GCCH_2s (ch));
1952 
1953  /* all good, pass next message to client */
1955  ccc->num_recv--;
1956  /* FIXME: if unreliable, this is not aggressive
1957  enough, as it would be OK to have lost some! */
1958 
1959  ch->mid_recv.mid = htonl (1 + ntohl (com->mid.mid));
1960  ch->mid_futures >>= 1; /* equivalent to division by 2 */
1961  ccc->client_ready = GNUNET_NO;
1962  GSC_send_to_client (ccc->c, com->env);
1963  GNUNET_free (com);
1964  send_channel_data_ack (ch);
1965  if (NULL != ccc->head_recv)
1966  return;
1967  if (GNUNET_NO == ch->destroy)
1968  return;
1969  GCT_send_channel_destroy (ch->t, ch->ctn);
1970  channel_destroy (ch);
1971 }
int out_of_order
Is the tunnel out-of-order?
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
static void channel_destroy(struct CadetChannel *ch)
Destroy the given channel.
uint32_t channel_of_client
Values for channel numbering.
Definition: cadet.h:111
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static void send_ack_to_client(struct CadetChannel *ch, int to_owner)
Send a GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK to the client to solicit more messages.
struct CadetChannelClient * owner
Client owner of the tunnel, if any.
uint32_t mid
Unique ID of the message, cycles around, in NBO.
int is_loopback
Is this channel a loopback channel, where the destination is us again?
struct CadetChannelClient * dest
Client destination of the tunnel, if any.
#define GNUNET_NO
Definition: gnunet_common.h:78
List of received out-of-order data messages.
struct ChannelMessageIdentifier mid_recv
Next MID expected for incoming traffic.
struct GNUNET_MQ_Envelope * env
The envelope with the payload of the out-of-order message.
unsigned int num_recv
Number of entries currently in head_recv DLL.
void GCT_send_channel_destroy(struct CadetTunnel *t, struct GNUNET_CADET_ChannelTunnelNumber ctn)
Send a DESTROY message via the tunnel.
int reliable
Is the tunnel reliable?
struct CadetTunnel * t
Tunnel this channel is in.
#define LOG(level,...)
struct CadetOutOfOrderMessage * tail_recv
Tail DLL of messages received out of order or while client was unready.
struct GNUNET_CADET_ClientChannelNumber ccn
Local tunnel number for this client.
struct GNUNET_CADET_ChannelTunnelNumber ctn
Number identifying this channel in its tunnel.
int client_ready
Can we send data to the client?
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
int destroy
Flag to signal the destruction of the channel.
Client endpoint of a struct CadetChannel.
const char * GSC_2s(struct CadetClient *c)
Return identifier for a client as a string.
struct CadetClient * c
Client handle.
void GSC_send_to_client(struct CadetClient *c, struct GNUNET_MQ_Envelope *env)
Send a message to a client.
static void send_channel_data_ack(struct CadetChannel *ch)
Compute and send the current GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK to the other peer...
#define GNUNET_YES
Definition: gnunet_common.h:77
struct ChannelMessageIdentifier mid
ID of the message (messages up to this point needed before we give this one to the client)...
struct CadetOutOfOrderMessage * head_recv
Head of DLL of messages received out of order or while client was unready.
#define GNUNET_free(ptr)
Wrapper around free.
uint64_t mid_futures
Bitfield of already-received messages past mid_recv.
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