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"
Include dependency graph for gnunet-service-cadet_channel.h:
This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

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...
 
int GCCH_is_type_to_drop (struct CadetChannel *ch, const struct GNUNET_MessageHeader *message)
 Check if type of message is the one to drop. More...
 
void GCCH_assign_type_to_drop (struct CadetChannel *ch, const struct GNUNET_CADET_RequestDropCadetMessage *message)
 Check if type of message is the one to drop. 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 462 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().

465 {
466  struct GNUNET_HashContext *hc;
467 
469  GNUNET_CRYPTO_hash_context_read (hc, port, sizeof(*port));
470  GNUNET_CRYPTO_hash_context_read (hc, listener, sizeof(*listener));
473  "Calculated port hash %s\n",
474  GNUNET_h2s (h_port));
475 }
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:483
Context for cummulative hashing.
Definition: crypto_hash.c:468
#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:509
void GNUNET_CRYPTO_hash_context_finish(struct GNUNET_HashContext *hc, struct GNUNET_HashCode *r_hash)
Finish the hash computation.
Definition: crypto_hash.c:526
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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
chCadetChannel to check for message type to drop.
messageGNUNET_MessageHeader to compare the type with.

Definition at line 410 of file gnunet-service-cadet_channel.c.

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

Referenced by GCT_send().

411 {
412 
413  if (ch->type == message->type)
414  {
415  ch->type = 0;
416  return GNUNET_YES;
417  }
418  else
419  return GNUNET_NO;
420 }
uint16_t type
Type of message to be droped.
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
Here is the caller graph for this function:

◆ GCCH_assign_type_to_drop()

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

Check if type of message is the one to drop.

Parameters
chCadetChannel to assign type to drop.
messageGNUNET_CADET_RequestDropCadetMessage to get the type from.

Check if type of message is the one to drop.

Parameters
chCadetChannel to assign type to drop.
messageGNUNET_CADET_RequestDropCadetMessage to get the type from.

Definition at line 397 of file gnunet-service-cadet_channel.c.

References GNUNET_CADET_RequestDropCadetMessage::type, and CadetChannel::type.

Referenced by handle_drop_message().

398 {
399 
400  ch->type = message->type;
401 
402 }
uint16_t type
Type of message to be droped.
uint16_t type
Type of the message this handler covers, in host byte order.
Definition: cadet.h:332
Here is the caller graph for this function:

◆ 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 430 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().

431 {
432  static char buf[128];
433 
434  GNUNET_snprintf (buf,
435  sizeof(buf),
436  "Channel %s:%s ctn:%X(%X/%X)",
437  (GNUNET_YES == ch->is_loopback)
438  ? "loopback"
440  GNUNET_h2s (&ch->port),
441  ch->ctn,
442  (NULL == ch->owner)
443  ? 0
444  : ntohl (ch->owner->ccn.channel_of_client),
445  (NULL == ch->dest)
446  ? 0
447  : ntohl (ch->dest->ccn.channel_of_client));
448  return buf;
449 }
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:110
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.
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.
Here is the call graph for this function:
Here is the caller graph for this function:

◆ GCCH_debug()

void GCCH_debug ( struct CadetChannel ch,
enum GNUNET_ErrorType  level 
)

Log channel info.

Parameters
chChannel.
levelDebug level to use.

Definition at line 2021 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().

2022 {
2023 #if ! defined(GNUNET_CULL_LOGGING)
2024  int do_log;
2025 
2027  "cadet-chn",
2028  __FILE__,
2029  __FUNCTION__,
2030  __LINE__);
2031  if (0 == do_log)
2032  return;
2033 
2034  if (NULL == ch)
2035  {
2036  LOG2 (level, "CHN *** DEBUG NULL CHANNEL ***\n");
2037  return;
2038  }
2039  LOG2 (level, "CHN %s:%X (%p)\n", GCT_2s (ch->t), ch->ctn, ch);
2040  if (NULL != ch->owner)
2041  {
2042  LOG2 (level,
2043  "CHN origin %s ready %s local-id: %u\n",
2044  GSC_2s (ch->owner->c),
2045  ch->owner->client_ready ? "YES" : "NO",
2046  ntohl (ch->owner->ccn.channel_of_client));
2047  }
2048  if (NULL != ch->dest)
2049  {
2050  LOG2 (level,
2051  "CHN destination %s ready %s local-id: %u\n",
2052  GSC_2s (ch->dest->c),
2053  ch->dest->client_ready ? "YES" : "NO",
2054  ntohl (ch->dest->ccn.channel_of_client));
2055  }
2056  LOG2 (level,
2057  "CHN Message IDs recv: %d (%LLX), send: %d\n",
2058  ntohl (ch->mid_recv.mid),
2059  (unsigned long long) ch->mid_futures,
2060  ntohl (ch->mid_send.mid));
2061 #endif
2062 }
uint32_t channel_of_client
Values for channel numbering.
Definition: cadet.h:110
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.
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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 486 of file gnunet-service-cadet_channel.c.

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

487 {
488  return ch->ctn;
489 }
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 670 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().

675 {
676  struct CadetChannel *ch;
677  struct CadetChannelClient *ccco;
678 
679  ccco = GNUNET_new (struct CadetChannelClient);
680  ccco->c = owner;
681  ccco->ccn = ccn;
682  ccco->client_ready = GNUNET_YES;
683 
684  ch = GNUNET_new (struct CadetChannel);
685  ch->mid_recv.mid = htonl (1); /* The OPEN_ACK counts as message 0! */
686  ch->nobuffer = GNUNET_NO;
687  ch->reliable = GNUNET_YES;
688  ch->out_of_order = GNUNET_NO;
690  (ch->nobuffer) ? 1 : 4; /* FIXME: 4!? Do not hardcode! */
691  ch->owner = ccco;
692  ch->port = *port;
693  GCCH_hash_port (&ch->h_port, port, GCP_get_id (destination));
694  if (0 == GNUNET_memcmp (&my_full_id, GCP_get_id (destination)))
695  {
696  struct OpenPort *op;
697 
698  ch->is_loopback = GNUNET_YES;
700  if (NULL == op)
701  {
702  /* port closed, wait for it to possibly open */
706  &ch->h_port,
707  ch,
710  "Created loose incoming loopback channel to port %s\n",
711  GNUNET_h2s (&ch->port));
712  }
713  else
714  {
715  GCCH_bind (ch, op->c, &op->port);
716  }
717  }
718  else
719  {
720  ch->t = GCP_get_tunnel (destination, GNUNET_YES);
722  ch->ctn = GCT_add_channel (ch->t, ch);
723  }
724  GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
726  "Created channel to port %s at peer %s for %s using %s\n",
727  GNUNET_h2s (port),
728  GCP_2s (destination),
729  GSC_2s (owner),
730  (GNUNET_YES == ch->is_loopback) ? "loopback" : GCT_2s (ch->t));
731  return ch;
732 }
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)?
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:82
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.
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.
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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 967 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().

970 {
971  uint32_t options;
972  struct CadetChannelClient *cccd;
973 
975  "Binding %s from %s to port %s of %s\n",
976  GCCH_2s (ch),
977  GCT_2s (ch->t),
978  GNUNET_h2s (&ch->port),
979  GSC_2s (c));
980  if (NULL != ch->retry_control_task)
981  {
982  /* there might be a timeout task here */
984  ch->retry_control_task = NULL;
985  }
986  options = 0;
987  cccd = GNUNET_new (struct CadetChannelClient);
988  GNUNET_assert (NULL == ch->dest);
989  ch->dest = cccd;
990  ch->port = *port;
991  cccd->c = c;
992  cccd->client_ready = GNUNET_YES;
993  cccd->ccn = GSC_bind (c,
994  ch,
995  (GNUNET_YES == ch->is_loopback)
997  : GCT_get_destination (ch->t),
998  port,
999  options);
1000  GNUNET_assert (ntohl (cccd->ccn.channel_of_client) <
1002  ch->mid_recv.mid = htonl (1); /* The OPEN counts as message 0! */
1003  if (GNUNET_YES == ch->is_loopback)
1004  {
1006  GCCH_handle_channel_open_ack (ch, NULL, port);
1007  }
1008  else
1009  {
1010  /* notify other peer that we accepted the connection */
1011  ch->state = CADET_CHANNEL_READY;
1013  }
1014  /* give client it's initial supply of ACKs */
1015  GNUNET_assert (ntohl (cccd->ccn.channel_of_client) <
1017  for (unsigned int i = 0; i < ch->max_pending_messages; i++)
1019 }
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:110
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.
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:1296
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:82
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.
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:972
struct GNUNET_HashCode port
Destination port of the channel.
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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 1052 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().

1055 {
1057  "%s asks for destruction of %s\n",
1058  GSC_2s (c),
1059  GCCH_2s (ch));
1060  GNUNET_assert (NULL != c);
1061  if ((NULL != ch->owner) && (c == ch->owner->c) &&
1063  {
1064  free_channel_client (ch->owner);
1065  ch->owner = NULL;
1066  }
1067  else if ((NULL != ch->dest) && (c == ch->dest->c) &&
1069  {
1070  free_channel_client (ch->dest);
1071  ch->dest = NULL;
1072  }
1073  else
1074  {
1075  GNUNET_assert (0);
1076  }
1077 
1078  if (GNUNET_YES == ch->destroy)
1079  {
1080  /* other end already destroyed, with the local client gone, no need
1081  to finish transmissions, just destroy immediately. */
1082  channel_destroy (ch);
1083  return;
1084  }
1085  if ((NULL != ch->head_sent) && ((NULL != ch->owner) || (NULL != ch->dest)))
1086  {
1087  /* Wait for other end to destroy us as well,
1088  and otherwise allow send queue to be transmitted first */
1089  ch->destroy = GNUNET_YES;
1090  return;
1091  }
1092  if ((GNUNET_YES == ch->is_loopback) &&
1093  ((NULL != ch->owner) || (NULL != ch->dest)))
1094  {
1095  if (NULL != ch->retry_control_task)
1097  ch->retry_control_task =
1099  return;
1100  }
1101  if (GNUNET_NO == ch->is_loopback)
1102  {
1103  /* If the we ever sent the CHANNEL_CREATE, we need to send a destroy message. */
1104  switch (ch->state)
1105  {
1106  case CADET_CHANNEL_NEW:
1107  /* We gave up on a channel that we created as a client to a remote
1108  target, but that never went anywhere. Nothing to do here. */
1109  break;
1110 
1111  case CADET_CHANNEL_LOOSE:
1112  break;
1113 
1114  default:
1115  GCT_send_channel_destroy (ch->t, ch->ctn);
1116  }
1117  }
1118  /* Nothing left to do, just finish destruction */
1119  channel_destroy (ch);
1120 }
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:110
#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.
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:1296
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.
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:972
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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 649 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().

650 {
651  GNUNET_assert (NULL == ch->retry_control_task);
653  "Tunnel up, sending CHANNEL_OPEN on %s now\n",
654  GCCH_2s (ch));
656 }
#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:1296
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.
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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 765 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().

769 {
770  struct CadetChannel *ch;
771  struct OpenPort *op;
772 
773  ch = GNUNET_new (struct CadetChannel);
774  ch->h_port = *h_port;
775  ch->t = t;
776  ch->ctn = ctn;
778  ch->nobuffer = GNUNET_NO;
779  ch->reliable = GNUNET_YES;
780  ch->out_of_order = GNUNET_NO;
782  (ch->nobuffer) ? 1 : 4; /* FIXME: 4!? Do not hardcode! */
783  GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
784 
786  if (NULL == op)
787  {
788  /* port closed, wait for it to possibly open */
792  &ch->h_port,
793  ch,
795  GNUNET_assert (NULL == ch->retry_control_task);
798  ch);
800  "Created loose incoming channel to port %s from peer %s\n",
801  GNUNET_h2s (&ch->port),
802  GCP_2s (GCT_get_destination (ch->t)));
803  }
804  else
805  {
806  GCCH_bind (ch, op->c, &op->port);
807  }
808  GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
809  return ch;
810 }
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)?
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:1269
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.
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.
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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 897 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().

900 {
901  if (NULL == ch->dest)
902  {
904  "Ignoring duplicate CHANNEL_OPEN on %s: port is closed\n",
905  GCCH_2s (ch));
906  return;
907  }
908  if (NULL != ch->retry_control_task)
909  {
911  "Ignoring duplicate CHANNEL_OPEN on %s: control message is pending\n",
912  GCCH_2s (ch));
913  return;
914  }
916  "Retransmitting CHANNEL_OPEN_ACK on %s\n",
917  GCCH_2s (ch));
919 }
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:1296
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.
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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 1233 of file gnunet-service-cadet_channel.c.

References CadetChannelClient::c, CadetChannelClient::ccn, GNUNET_CADET_LocalData::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().

1237 {
1238  struct GNUNET_MQ_Envelope *env;
1239  struct GNUNET_CADET_LocalData *ld;
1240  struct CadetChannelClient *ccc;
1241  size_t payload_size;
1242  struct CadetOutOfOrderMessage *com;
1243  int duplicate;
1244  uint32_t mid_min;
1245  uint32_t mid_max;
1246  uint32_t mid_msg;
1247  uint32_t delta;
1248 
1250  if ((NULL == ch->owner) && (NULL == ch->dest))
1251  {
1252  /* This client is gone, but we still have messages to send to
1253  the other end (which is why @a ch is not yet dead). However,
1254  we cannot pass messages to our client anymore. */
1256  "Dropping incoming payload on %s as this end is already closed\n",
1257  GCCH_2s (ch));
1258  /* send back DESTROY notification to stop further retransmissions! */
1259  if (GNUNET_YES == ch->destroy)
1260  GCT_send_channel_destroy (ch->t, ch->ctn);
1261  return;
1262  }
1263  payload_size = ntohs (msg->header.size) - sizeof(*msg);
1264  env = GNUNET_MQ_msg_extra (ld,
1265  payload_size,
1267  ld->ccn = (NULL == ch->dest) ? ch->owner->ccn : ch->dest->ccn;
1268  GNUNET_memcpy (&ld[1], &msg[1], payload_size);
1269  ccc = (NULL != ch->owner) ? ch->owner : ch->dest;
1270  if (GNUNET_YES == ccc->client_ready)
1271  {
1272  /*
1273  * We ad-hoc send the message if
1274  * - The channel is out-of-order
1275  * - The channel is reliable and MID matches next expected MID
1276  * - The channel is unreliable and MID is before lowest seen MID
1277  */if ((GNUNET_YES == ch->out_of_order) ||
1278  ((msg->mid.mid == ch->mid_recv.mid) && (GNUNET_YES == ch->reliable)) ||
1279  ((GNUNET_NO == ch->reliable) &&
1280  (ntohl (msg->mid.mid) >= ntohl (ch->mid_recv.mid)) &&
1281  ((NULL == ccc->head_recv) ||
1282  (ntohl (msg->mid.mid) < ntohl (ccc->head_recv->mid.mid)))))
1283  {
1285  "Giving %u bytes of payload with MID %u from %s to client %s\n",
1286  (unsigned int) payload_size,
1287  ntohl (msg->mid.mid),
1288  GCCH_2s (ch),
1289  GSC_2s (ccc->c));
1290  ccc->client_ready = GNUNET_NO;
1291  GSC_send_to_client (ccc->c, env);
1292  if (GNUNET_NO == ch->out_of_order)
1293  ch->mid_recv.mid = htonl (1 + ntohl (msg->mid.mid));
1294  else
1295  ch->mid_recv.mid = htonl (1 + ntohl (ch->mid_recv.mid));
1296  ch->mid_futures >>= 1;
1297  if ((GNUNET_YES == ch->out_of_order) && (GNUNET_NO == ch->reliable))
1298  {
1299  /* possibly shift by more if we skipped messages */
1300  uint64_t delta = htonl (msg->mid.mid) - 1 - ntohl (ch->mid_recv.mid);
1301 
1302  if (delta > 63)
1303  ch->mid_futures = 0;
1304  else
1305  ch->mid_futures >>= delta;
1306  ch->mid_recv.mid = htonl (1 + ntohl (msg->mid.mid));
1307  }
1308  send_channel_data_ack (ch);
1309  return;
1310  }
1311  }
1312 
1313  if (GNUNET_YES == ch->reliable)
1314  {
1315  /* check if message ought to be dropped because it is ancient/too distant/duplicate */
1316  mid_min = ntohl (ch->mid_recv.mid);
1317  mid_max = mid_min + ch->max_pending_messages;
1318  mid_msg = ntohl (msg->mid.mid);
1319  if (((uint32_t) (mid_msg - mid_min) > ch->max_pending_messages) ||
1320  ((uint32_t) (mid_max - mid_msg) > ch->max_pending_messages))
1321  {
1323  "%s at %u drops ancient or far-future message %u\n",
1324  GCCH_2s (ch),
1325  (unsigned int) mid_min,
1326  ntohl (msg->mid.mid));
1327 
1329  "# duplicate DATA (ancient or future)",
1330  1,
1331  GNUNET_NO);
1332  GNUNET_MQ_discard (env);
1333  send_channel_data_ack (ch);
1334  return;
1335  }
1336  /* mark bit for future ACKs */
1337  delta = mid_msg - mid_min - 1; /* overflow/underflow are OK here */
1338  if (delta < 64)
1339  {
1340  if (0 != (ch->mid_futures & (1LLU << delta)))
1341  {
1342  /* Duplicate within the queue, drop also */
1344  "Duplicate payload of %u bytes on %s (mid %u) dropped\n",
1345  (unsigned int) payload_size,
1346  GCCH_2s (ch),
1347  ntohl (msg->mid.mid));
1348  GNUNET_STATISTICS_update (stats, "# duplicate DATA", 1, GNUNET_NO);
1349  GNUNET_MQ_discard (env);
1350  send_channel_data_ack (ch);
1351  return;
1352  }
1353  ch->mid_futures |= (1LLU << delta);
1355  "Marked bit %llX for mid %u (base: %u); now: %llX\n",
1356  (1LLU << delta),
1357  mid_msg,
1358  mid_min,
1359  ch->mid_futures);
1360  }
1361  }
1362  else /* ! ch->reliable */
1363  {
1364  struct CadetOutOfOrderMessage *next_msg;
1365 
1370  if ((NULL != ccc->head_recv) && (GNUNET_YES == ccc->client_ready))
1371  {
1372  next_msg = ccc->head_recv;
1374  "Giving queued MID %u from %s to client %s\n",
1375  ntohl (next_msg->mid.mid),
1376  GCCH_2s (ch),
1377  GSC_2s (ccc->c));
1378  ccc->client_ready = GNUNET_NO;
1379  GSC_send_to_client (ccc->c, next_msg->env);
1380  ch->mid_recv.mid = htonl (1 + ntohl (next_msg->mid.mid));
1381  ch->mid_futures >>= 1;
1382  send_channel_data_ack (ch);
1383  GNUNET_CONTAINER_DLL_remove (ccc->head_recv, ccc->tail_recv, next_msg);
1384  ccc->num_recv--;
1385  /* Do not process duplicate MID */
1386  if (msg->mid.mid == next_msg->mid.mid) /* Duplicate */
1387  {
1388  /* Duplicate within the queue, drop */
1390  "Message on %s (mid %u) dropped, duplicate\n",
1391  GCCH_2s (ch),
1392  ntohl (msg->mid.mid));
1393  GNUNET_free (next_msg);
1394  GNUNET_MQ_discard (env);
1395  return;
1396  }
1397  GNUNET_free (next_msg);
1398  }
1399 
1400  if (ntohl (msg->mid.mid) < ntohl (ch->mid_recv.mid)) /* Old */
1401  {
1402  /* Duplicate within the queue, drop */
1404  "Message on %s (mid %u) dropped, old.\n",
1405  GCCH_2s (ch),
1406  ntohl (msg->mid.mid));
1407  GNUNET_MQ_discard (env);
1408  return;
1409  }
1410 
1411  /* Channel is unreliable, so we do not ACK. But we also cannot
1412  allow buffering everything, so check if we have space... */
1413  if (ccc->num_recv >= ch->max_pending_messages)
1414  {
1415  struct CadetOutOfOrderMessage *drop;
1416 
1417  /* Yep, need to drop. Drop the oldest message in
1418  the buffer. */
1420  "Queue full due slow client on %s, dropping oldest message\n",
1421  GCCH_2s (ch));
1423  "# messages dropped due to slow client",
1424  1,
1425  GNUNET_NO);
1426  drop = ccc->head_recv;
1427  GNUNET_assert (NULL != drop);
1428  GNUNET_CONTAINER_DLL_remove (ccc->head_recv, ccc->tail_recv, drop);
1429  ccc->num_recv--;
1430  GNUNET_MQ_discard (drop->env);
1431  GNUNET_free (drop);
1432  }
1433  }
1434 
1435  /* Insert message into sorted out-of-order queue */
1436  com = GNUNET_new (struct CadetOutOfOrderMessage);
1437  com->mid = msg->mid;
1438  com->env = env;
1439  duplicate = GNUNET_NO;
1441  is_before,
1442  &duplicate,
1443  ccc->head_recv,
1444  ccc->tail_recv,
1445  com);
1446  ccc->num_recv++;
1447  if (GNUNET_YES == duplicate)
1448  {
1449  /* Duplicate within the queue, drop also (this is not covered by
1450  the case above if "delta" >= 64, which could be the case if
1451  max_pending_messages is also >= 64 or if our client is unready
1452  and we are seeing retransmissions of the message our client is
1453  blocked on. */LOG (GNUNET_ERROR_TYPE_DEBUG,
1454  "Duplicate payload of %u bytes on %s (mid %u) dropped\n",
1455  (unsigned int) payload_size,
1456  GCCH_2s (ch),
1457  ntohl (msg->mid.mid));
1458  GNUNET_STATISTICS_update (stats, "# duplicate DATA", 1, GNUNET_NO);
1460  ccc->num_recv--;
1461  GNUNET_MQ_discard (com->env);
1462  GNUNET_free (com);
1463  send_channel_data_ack (ch);
1464  return;
1465  }
1467  "Queued %s payload of %u bytes on %s-%X(%p) (mid %u, need %u first)\n",
1468  (GNUNET_YES == ccc->client_ready) ? "out-of-order" : "client-not-ready",
1469  (unsigned int) payload_size,
1470  GCCH_2s (ch),
1471  ntohl (ccc->ccn.channel_of_client),
1472  ccc,
1473  ntohl (msg->mid.mid),
1474  ntohl (ch->mid_recv.mid));
1475  /* NOTE: this ACK we _could_ skip, as the packet is out-of-order and
1476  the sender may already be transmitting the previous one. Needs
1477  experimental evaluation to see if/when this ACK helps or
1478  hurts. (We might even want another option.) */
1479  send_channel_data_ack (ch);
1480 }
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:110
#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_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:262
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:323
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...
Message for cadet data traffic.
Definition: cadet.h:252
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.
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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 1572 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().

1576 {
1577  struct CadetReliableMessage *crm;
1578  struct CadetReliableMessage *crmn;
1579  int found;
1580  uint32_t mid_base;
1581  uint64_t mid_mask;
1582  unsigned int delta;
1583 
1585  if (GNUNET_NO == ch->reliable)
1586  {
1587  /* not expecting ACKs on unreliable channel, odd */
1588  GNUNET_break_op (0);
1589  return;
1590  }
1591  /* mid_base is the MID of the next message that the
1592  other peer expects (i.e. that is missing!), everything
1593  LOWER (but excluding mid_base itself) was received. */
1594  mid_base = ntohl (ack->mid.mid);
1595  mid_mask = GNUNET_htonll (ack->futures);
1596  found = GNUNET_NO;
1597  for (crm = ch->head_sent; NULL != crm; crm = crmn)
1598  {
1599  crmn = crm->next;
1600  delta = (unsigned int) (ntohl (crm->data_message->mid.mid) - mid_base);
1601  if (delta >= UINT_MAX - ch->max_pending_messages)
1602  {
1603  /* overflow, means crm was a bit in the past, so this ACK counts for it. */
1605  "Got DATA_ACK with base %u satisfying past message %u on %s\n",
1606  (unsigned int) mid_base,
1607  ntohl (crm->data_message->mid.mid),
1608  GCCH_2s (ch));
1609  handle_matching_ack (ch, cti, crm);
1610  found = GNUNET_YES;
1611  continue;
1612  }
1613  delta--;
1614  if (delta >= 64)
1615  continue;
1617  "Testing bit %llX for mid %u (base: %u)\n",
1618  (1LLU << delta),
1619  ntohl (crm->data_message->mid.mid),
1620  mid_base);
1621  if (0 != (mid_mask & (1LLU << delta)))
1622  {
1624  "Got DATA_ACK with mask for %u on %s\n",
1625  ntohl (crm->data_message->mid.mid),
1626  GCCH_2s (ch));
1627  handle_matching_ack (ch, cti, crm);
1628  found = GNUNET_YES;
1629  }
1630  }
1631  if (GNUNET_NO == found)
1632  {
1633  /* ACK for message we already dropped, might have been a
1634  duplicate ACK? Ignore. */
1636  "Duplicate DATA_ACK on %s, ignoring\n",
1637  GCCH_2s (ch));
1638  GNUNET_STATISTICS_update (stats, "# duplicate DATA_ACKs", 1, GNUNET_NO);
1639  return;
1640  }
1641  if (NULL != ch->retry_data_task)
1642  {
1644  ch->retry_data_task = NULL;
1645  }
1646  if ((NULL != ch->head_sent) && (NULL == ch->head_sent->qe))
1649  ch);
1650 }
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.
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:36
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.
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:1246
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:972
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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 1133 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().

1137 {
1138  switch (ch->state)
1139  {
1140  case CADET_CHANNEL_NEW:
1141  /* this should be impossible */
1142  GNUNET_break (0);
1143  break;
1144 
1145  case CADET_CHANNEL_LOOSE:
1146  /* This makes no sense. */
1147  GNUNET_break_op (0);
1148  break;
1149 
1151  if (NULL == ch->owner)
1152  {
1153  /* We're not the owner, wrong direction! */
1154  GNUNET_break_op (0);
1155  return;
1156  }
1157  if (0 != GNUNET_memcmp (&ch->port, port))
1158  {
1159  /* Other peer failed to provide the right port,
1160  refuse connection. */
1161  GNUNET_break_op (0);
1162  return;
1163  }
1165  "Received CHANNEL_OPEN_ACK for waiting %s, entering READY state\n",
1166  GCCH_2s (ch));
1167  if (NULL != ch->retry_control_task) /* can be NULL if ch->is_loopback */
1168  {
1170  ch->retry_control_task = NULL;
1171  }
1172  ch->state = CADET_CHANNEL_READY;
1173  /* On first connect, send client as many ACKs as we allow messages
1174  to be buffered! */
1175  for (unsigned int i = 0; i < ch->max_pending_messages; i++)
1177  break;
1178 
1179  case CADET_CHANNEL_READY:
1180  /* duplicate ACK, maybe we retried the CREATE. Ignore. */
1182  "Received duplicate channel OPEN_ACK for %s\n",
1183  GCCH_2s (ch));
1184  GNUNET_STATISTICS_update (stats, "# duplicate CREATE_ACKs", 1, GNUNET_NO);
1185  break;
1186  }
1187 }
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.
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.
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:972
struct GNUNET_HashCode port
Destination port of the channel.
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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 1663 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().

1666 {
1667  struct CadetChannelClient *ccc;
1668 
1671  "Received remote channel DESTROY for %s\n",
1672  GCCH_2s (ch));
1673  if (GNUNET_YES == ch->destroy)
1674  {
1675  /* Local client already gone, this is instant-death. */
1676  channel_destroy (ch);
1677  return;
1678  }
1679  ccc = (NULL != ch->owner) ? ch->owner : ch->dest;
1680  if ((NULL != ccc) && (NULL != ccc->head_recv))
1681  {
1683  "Lost end of transmission due to remote shutdown on %s\n",
1684  GCCH_2s (ch));
1685  /* FIXME: change API to notify client about truncated transmission! */
1686  }
1687  ch->destroy = GNUNET_YES;
1688  if (NULL != ccc)
1689  GSC_handle_remote_channel_destroy (ccc->c, ccc->ccn, ch);
1690  channel_destroy (ch);
1691 }
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.
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.
struct CadetOutOfOrderMessage * head_recv
Head of DLL of messages received out of order or while client was unready.
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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 1812 of file gnunet-service-cadet_channel.c.

References CadetChannelClient::c, CadetChannelClient::ccn, GNUNET_CADET_LocalData::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().

1816 {
1817  struct CadetReliableMessage *crm;
1818 
1819  if (ch->pending_messages >= ch->max_pending_messages)
1820  {
1821  GNUNET_break (0); /* Fails: #5370 */
1822  return GNUNET_SYSERR;
1823  }
1824  if (GNUNET_YES == ch->destroy)
1825  {
1826  /* we are going down, drop messages */
1827  return GNUNET_OK;
1828  }
1829  ch->pending_messages++;
1830 
1831  if (GNUNET_YES == ch->is_loopback)
1832  {
1833  struct CadetChannelClient *receiver;
1834  struct GNUNET_MQ_Envelope *env;
1835  struct GNUNET_CADET_LocalData *ld;
1836  int ack_to_owner;
1837 
1838  env =
1840  if ((NULL != ch->owner) &&
1841  (sender_ccn.channel_of_client == ch->owner->ccn.channel_of_client))
1842  {
1843  receiver = ch->dest;
1844  ack_to_owner = GNUNET_YES;
1845  }
1846  else if ((NULL != ch->dest) &&
1847  (sender_ccn.channel_of_client == ch->dest->ccn.channel_of_client))
1848  {
1849  receiver = ch->owner;
1850  ack_to_owner = GNUNET_NO;
1851  }
1852  else
1853  {
1854  GNUNET_break (0);
1855  return GNUNET_SYSERR;
1856  }
1857  GNUNET_assert (NULL != receiver);
1858  ld->ccn = receiver->ccn;
1859  GNUNET_memcpy (&ld[1], buf, buf_len);
1860  if (GNUNET_YES == receiver->client_ready)
1861  {
1862  ch->pending_messages--;
1863  GSC_send_to_client (receiver->c, env);
1864  send_ack_to_client (ch, ack_to_owner);
1865  }
1866  else
1867  {
1868  struct CadetOutOfOrderMessage *oom;
1869 
1870  oom = GNUNET_new (struct CadetOutOfOrderMessage);
1871  oom->env = env;
1873  receiver->tail_recv,
1874  oom);
1875  receiver->num_recv++;
1876  }
1877  return GNUNET_OK;
1878  }
1879 
1880  /* Everything is correct, send the message. */
1881  crm = GNUNET_malloc (sizeof(*crm));
1882  crm->ch = ch;
1883  crm->data_message = GNUNET_malloc (
1884  sizeof(struct GNUNET_CADET_ChannelAppDataMessage) + buf_len);
1885  crm->data_message->header.size =
1886  htons (sizeof(struct GNUNET_CADET_ChannelAppDataMessage) + buf_len);
1887  crm->data_message->header.type =
1889  ch->mid_send.mid = htonl (ntohl (ch->mid_send.mid) + 1);
1890  crm->data_message->mid = ch->mid_send;
1891  crm->data_message->ctn = ch->ctn;
1892  GNUNET_memcpy (&crm->data_message[1], buf, buf_len);
1895  "Sending message %u from local client to %s with %u bytes\n",
1896  ntohl (crm->data_message->mid.mid),
1897  GCCH_2s (ch),
1898  buf_len);
1899  if (NULL != ch->retry_data_task)
1900  {
1902  ch->retry_data_task = NULL;
1903  }
1904  crm->qe = GCT_send (ch->t, &crm->data_message->header, &data_sent_cb, crm, &crm->data_message->ctn);
1905  GNUNET_assert (NULL == ch->retry_data_task);
1906  return GNUNET_OK;
1907 }
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:110
#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.
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.
struct CadetTunnelQueueEntry * GCT_send(struct CadetTunnel *t, const struct GNUNET_MessageHeader *message, GCT_SendContinuation cont, void *cont_cls, struct GNUNET_CADET_ChannelTunnelNumber *ctn)
Sends an already built message on a tunnel, encrypting it and choosing the best connection if not pro...
#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:262
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA.
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
#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.
Message for cadet data traffic.
Definition: cadet.h:252
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:972
Here is the call graph for this function:
Here is the caller graph for this function:

◆ 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 1918 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().

1920 {
1921  struct CadetChannelClient *ccc;
1922  struct CadetOutOfOrderMessage *com;
1923 
1924  if ((NULL != ch->owner) &&
1925  (ch->owner->ccn.channel_of_client == client_ccn.channel_of_client))
1926  ccc = ch->owner;
1927  else if ((NULL != ch->dest) &&
1928  (ch->dest->ccn.channel_of_client == client_ccn.channel_of_client))
1929  ccc = ch->dest;
1930  else
1931  GNUNET_assert (0);
1932  ccc->client_ready = GNUNET_YES;
1933  com = ccc->head_recv;
1934  if (NULL == com)
1935  {
1937  "Got LOCAL_ACK, %s-%X ready to receive more data, but none pending on %s-%X(%p)!\n",
1938  GSC_2s (ccc->c),
1939  ntohl (client_ccn.channel_of_client),
1940  GCCH_2s (ch),
1941  ntohl (ccc->ccn.channel_of_client),
1942  ccc);
1943  return; /* none pending */
1944  }
1945  if (GNUNET_YES == ch->is_loopback)
1946  {
1947  int to_owner;
1948 
1949  /* Messages are always in-order, just send */
1951  ccc->num_recv--;
1952  GSC_send_to_client (ccc->c, com->env);
1953  /* Notify sender that we can receive more */
1954  if ((NULL != ch->owner) &&
1956  {
1957  to_owner = GNUNET_NO;
1958  }
1959  else
1960  {
1961  GNUNET_assert ((NULL != ch->dest) && (ccc->ccn.channel_of_client ==
1962  ch->dest->ccn.channel_of_client));
1963  to_owner = GNUNET_YES;
1964  }
1965  send_ack_to_client (ch, to_owner);
1966  GNUNET_free (com);
1967  return;
1968  }
1969 
1970  if ((com->mid.mid != ch->mid_recv.mid) && (GNUNET_NO == ch->out_of_order) &&
1971  (GNUNET_YES == ch->reliable))
1972  {
1974  "Got LOCAL_ACK, %s-%X ready to receive more data (but next one is out-of-order %u vs. %u)!\n",
1975  GSC_2s (ccc->c),
1976  ntohl (ccc->ccn.channel_of_client),
1977  ntohl (com->mid.mid),
1978  ntohl (ch->mid_recv.mid));
1979  return; /* missing next one in-order */
1980  }
1981 
1983  "Got LOCAL_ACK, giving payload message %u to %s-%X on %s\n",
1984  ntohl (com->mid.mid),
1985  GSC_2s (ccc->c),
1986  ntohl (ccc->ccn.channel_of_client),
1987  GCCH_2s (ch));
1988 
1989  /* all good, pass next message to client */
1991  ccc->num_recv--;
1992  /* FIXME: if unreliable, this is not aggressive
1993  enough, as it would be OK to have lost some! */
1994 
1995  ch->mid_recv.mid = htonl (1 + ntohl (com->mid.mid));
1996  ch->mid_futures >>= 1; /* equivalent to division by 2 */
1997  ccc->client_ready = GNUNET_NO;
1998  GSC_send_to_client (ccc->c, com->env);
1999  GNUNET_free (com);
2000  send_channel_data_ack (ch);
2001  if (NULL != ccc->head_recv)
2002  return;
2003  if (GNUNET_NO == ch->destroy)
2004  return;
2005  GCT_send_channel_destroy (ch->t, ch->ctn);
2006  channel_destroy (ch);
2007 }
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:110
#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.
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...
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.
Here is the call graph for this function:
Here is the caller graph for this function: