GNUnet  0.17.5
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...
 
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)
 Assign type of message 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 461 of file gnunet-service-cadet_channel.c.

464 {
465  struct GNUNET_HashContext *hc;
466 
468  GNUNET_CRYPTO_hash_context_read (hc, port, sizeof(*port));
469  GNUNET_CRYPTO_hash_context_read (hc, listener, sizeof(*listener));
472  "Calculated port hash %s\n",
473  GNUNET_h2s (h_port));
474 }
static uint16_t port
Port number.
Definition: gnunet-bcd.c:147
#define LOG(level,...)
struct GNUNET_HashContext * GNUNET_CRYPTO_hash_context_start(void)
Start incremental hashing operation.
Definition: crypto_hash.c:348
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:364
void GNUNET_CRYPTO_hash_context_finish(struct GNUNET_HashContext *hc, struct GNUNET_HashCode *r_hash)
Finish the hash computation.
Definition: crypto_hash.c:388
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
@ GNUNET_ERROR_TYPE_DEBUG

Referenced by GCCH_channel_local_new(), and handle_port_open().

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◆ GCCH_is_type_to_drop()

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

Check if type of message is the one to drop.

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

Definition at line 407 of file gnunet-service-cadet_channel.c.

409 {
410 
411  if (ch->type == message->type)
412  {
413  ch->type = 0;
414  return GNUNET_YES;
415  }
416  else
417  return GNUNET_NO;
418 }
static struct GNUNET_CADET_Channel * ch
Channel handle.
Definition: gnunet-cadet.c:117
@ GNUNET_YES
@ GNUNET_NO
Definition: gnunet_common.h:98
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.

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

Referenced by GCT_send().

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◆ GCCH_assign_type_to_drop()

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

Assign type of message to drop.

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

Definition at line 392 of file gnunet-service-cadet_channel.c.

394 {
395 
396  ch->type = message->type;
397 
398 }
uint16_t type
Type of the message this handler covers, in host byte order.
Definition: cadet.h:332

References ch, and GNUNET_CADET_RequestDropCadetMessage::type.

Referenced by handle_drop_message().

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◆ GCCH_2s()

const char* GCCH_2s ( const struct CadetChannel ch)

Get the static string for identification of the channel.

Parameters
chChannel.
Returns
Static string with the channel IDs.

Definition at line 429 of file gnunet-service-cadet_channel.c.

430 {
431  static char buf[128];
432 
434  sizeof(buf),
435  "Channel %s:%s ctn:%X(%X/%X)",
436  (GNUNET_YES == ch->is_loopback)
437  ? "loopback"
439  GNUNET_h2s (&ch->port),
440  ch->ctn.cn,
441  (NULL == ch->owner)
442  ? 0
443  : ntohl (ch->owner->ccn.channel_of_client),
444  (NULL == ch->dest)
445  ? 0
446  : ntohl (ch->dest->ccn.channel_of_client));
447  return buf;
448 }
const struct GNUNET_PeerIdentity * GCP_get_id(struct CadetPeer *cp)
Obtain the peer identity for a struct CadetPeer.
struct CadetPeer * GCT_get_destination(struct CadetTunnel *t)
Return the peer to which this tunnel goes.
static char buf[2048]
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
int GNUNET_snprintf(char *buf, size_t size, const char *format,...) __attribute__((format(printf
Like snprintf, just aborts if the buffer is of insufficient size.
struct GNUNET_CADET_ClientChannelNumber ccn
Local ID of the channel, GNUNET_CADET_LOCAL_CHANNEL_ID_CLI bit is set if outbound.
Definition: cadet.h:170
uint32_t channel_of_client
Values for channel numbering.
Definition: cadet.h:110

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

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

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◆ GCCH_debug()

void GCCH_debug ( struct CadetChannel ch,
enum GNUNET_ErrorType  level 
)

Log channel info.

Parameters
chChannel.
levelDebug level to use.

Definition at line 1964 of file gnunet-service-cadet_channel.c.

1965 {
1966 #if ! defined(GNUNET_CULL_LOGGING)
1967  int do_log;
1968 
1970  "cadet-chn",
1971  __FILE__,
1972  __FUNCTION__,
1973  __LINE__);
1974  if (0 == do_log)
1975  return;
1976 
1977  if (NULL == ch)
1978  {
1979  LOG2 (level, "CHN *** DEBUG NULL CHANNEL ***\n");
1980  return;
1981  }
1982  LOG2 (level, "CHN %s:%X (%p)\n", GCT_2s (ch->t), ch->ctn.cn, ch);
1983  if (NULL != ch->owner)
1984  {
1985  LOG2 (level,
1986  "CHN origin %s ready %s local-id: %u\n",
1987  GSC_2s (ch->owner->c),
1988  ch->owner->client_ready ? "YES" : "NO",
1989  ntohl (ch->owner->ccn.channel_of_client));
1990  }
1991  if (NULL != ch->dest)
1992  {
1993  LOG2 (level,
1994  "CHN destination %s ready %s local-id: %u\n",
1995  GSC_2s (ch->dest->c),
1996  ch->dest->client_ready ? "YES" : "NO",
1997  ntohl (ch->dest->ccn.channel_of_client));
1998  }
1999  LOG2 (level,
2000  "CHN Message IDs recv: %d (%llX), send: %d\n",
2001  ntohl (ch->mid_recv.mid),
2002  (unsigned long long) ch->mid_futures,
2003  ntohl (ch->mid_send.mid));
2004 #endif
2005 }
const char * GSC_2s(struct CadetClient *c)
Return identifier for a client as a string.
#define LOG2(level,...)
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
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.
@ GNUNET_ERROR_TYPE_BULK

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

Referenced by debug_channel().

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◆ GCCH_get_id()

struct GNUNET_CADET_ChannelTunnelNumber GCCH_get_id ( const struct CadetChannel ch)

Get the channel's public ID.

Parameters
chChannel.
Returns
ID used to identify the channel with the remote peer.

Definition at line 461 of file gnunet-service-cadet_channel.c.

486 {
487  return ch->ctn;
488 }

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

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◆ GCCH_channel_local_new()

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

Create a new channel.

Parameters
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

Definition at line 659 of file gnunet-service-cadet_channel.c.

664 {
665  struct CadetChannel *ch;
666  struct CadetChannelClient *ccco;
667 
668  ccco = GNUNET_new (struct CadetChannelClient);
669  ccco->c = owner;
670  ccco->ccn = ccn;
671  ccco->client_ready = GNUNET_YES;
672 
673  ch = GNUNET_new (struct CadetChannel);
674  ch->mid_recv.mid = htonl (1); /* The OPEN_ACK counts as message 0! */
675  ch->nobuffer = GNUNET_NO;
676  ch->reliable = GNUNET_YES;
677  ch->out_of_order = GNUNET_NO;
678  ch->max_pending_messages =
679  (ch->nobuffer) ? 1 : 4; /* FIXME: 4!? Do not hardcode! */
680  ch->owner = ccco;
681  ch->port = *port;
682  GCCH_hash_port (&ch->h_port, port, GCP_get_id (destination));
683  if (0 == GNUNET_memcmp (&my_full_id, GCP_get_id (destination)))
684  {
685  struct OpenPort *op;
686 
687  ch->is_loopback = GNUNET_YES;
689  if (NULL == op)
690  {
691  /* port closed, wait for it to possibly open */
692  ch->state = CADET_CHANNEL_LOOSE;
695  &ch->h_port,
696  ch,
699  "Created loose incoming loopback channel to port %s\n",
700  GNUNET_h2s (&ch->port));
701  }
702  else
703  {
704  GCCH_bind (ch, op->c, &op->port);
705  }
706  }
707  else
708  {
709  ch->t = GCP_get_tunnel (destination, GNUNET_YES);
710  ch->retry_time = CADET_INITIAL_RETRANSMIT_TIME;
711  ch->ctn = GCT_add_channel (ch->t, ch);
712  }
713  GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
715  "Created channel to port %s at peer %s for %s using %s\n",
716  GNUNET_h2s (port),
717  GCP_2s (destination),
718  GSC_2s (owner),
719  (GNUNET_YES == ch->is_loopback) ? "loopback" : GCT_2s (ch->t));
720  return ch;
721 }
static struct GNUNET_ARM_Operation * op
Current operation.
Definition: gnunet-arm.c:144
struct GNUNET_PeerIdentity my_full_id
Local peer own ID.
struct GNUNET_STATISTICS_Handle * stats
Handle to the statistics service.
struct GNUNET_CONTAINER_MultiHashMap * open_ports
All ports clients of this peer have opened.
struct GNUNET_CONTAINER_MultiHashMap * loose_channels
Map from ports to channels where the ports were closed at the time we got the inbound connection.
@ CADET_CHANNEL_LOOSE
Channel is to a port that is not open, we're waiting for the port to be opened.
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.
#define CADET_INITIAL_RETRANSMIT_TIME
How long do we initially wait before retransmitting?
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 CadetTunnel * GCP_get_tunnel(struct CadetPeer *cp, int create)
Get the tunnel towards a peer.
const char * GCP_2s(const struct CadetPeer *cp)
Get the static string for a peer ID.
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...
enum GNUNET_GenericReturnValue 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.
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.
@ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE
Allow multiple values with the same key.
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
Client endpoint of a struct CadetChannel.
struct CadetClient * c
Client handle.
struct GNUNET_CADET_ClientChannelNumber ccn
Local tunnel number for this client.
int client_ready
Can we send data to the client?
Struct containing all information regarding a channel to a remote client.
Port opened by a client.

References CadetChannelClient::c, CADET_CHANNEL_LOOSE, CADET_INITIAL_RETRANSMIT_TIME, CadetChannelClient::ccn, ch, CadetChannelClient::client_ready, GCCH_bind(), GCCH_hash_port(), GCP_2s(), GCP_get_id(), GCP_get_tunnel(), GCT_2s(), GCT_add_channel(), GNUNET_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(), LOG, loose_channels, my_full_id, op, open_ports, port, and stats.

Referenced by handle_channel_create().

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◆ GCCH_bind()

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

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

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

Parameters
chopen incoming channel
cclient listening on the respective port
portport number c is listening on

Definition at line 940 of file gnunet-service-cadet_channel.c.

943 {
944  uint32_t options;
945  struct CadetChannelClient *cccd;
946 
948  "Binding %s from %s to port %s of %s\n",
949  GCCH_2s (ch),
950  GCT_2s (ch->t),
951  GNUNET_h2s (&ch->port),
952  GSC_2s (c));
953  if (NULL != ch->retry_control_task)
954  {
955  /* there might be a timeout task here */
956  GNUNET_SCHEDULER_cancel (ch->retry_control_task);
957  ch->retry_control_task = NULL;
958  }
959  options = 0;
960  cccd = GNUNET_new (struct CadetChannelClient);
961  GNUNET_assert (NULL == ch->dest);
962  ch->dest = cccd;
963  ch->port = *port;
964  cccd->c = c;
965  cccd->client_ready = GNUNET_YES;
966  cccd->ccn = GSC_bind (c,
967  ch,
968  (GNUNET_YES == ch->is_loopback)
970  : GCT_get_destination (ch->t),
971  port,
972  options);
973  GNUNET_assert (ntohl (cccd->ccn.channel_of_client) <
975  ch->mid_recv.mid = htonl (1); /* The OPEN counts as message 0! */
976  if (GNUNET_YES == ch->is_loopback)
977  {
978  ch->state = CADET_CHANNEL_OPEN_SENT;
980  }
981  else
982  {
983  /* notify other peer that we accepted the connection */
984  ch->state = CADET_CHANNEL_READY;
985  ch->retry_control_task = GNUNET_SCHEDULER_add_now (&send_open_ack, ch);
986  }
987  /* give client it's initial supply of ACKs */
988  GNUNET_assert (ntohl (cccd->ccn.channel_of_client) <
990  for (unsigned int i = 0; i < ch->max_pending_messages; i++)
992 }
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
#define GNUNET_CADET_LOCAL_CHANNEL_ID_CLI
Minimum value for channel IDs of local clients.
Definition: cadet.h:71
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.
@ CADET_CHANNEL_OPEN_SENT
CHANNEL_OPEN message sent, waiting for CHANNEL_OPEN_ACK.
@ CADET_CHANNEL_READY
Connection confirmed, ready to carry traffic.
static void send_open_ack(void *cls)
Send our initial GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK to the client confirming that the connect...
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.
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
void GCCH_handle_channel_open_ack(struct CadetChannel *ch, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cti, const struct GNUNET_HashCode *port)
We got an acknowledgement for the creation of the channel (the port is open on the other side).
struct CadetPeer * GCP_get(const struct GNUNET_PeerIdentity *peer_id, int create)
Retrieve the CadetPeer structure associated with the peer.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
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:1281
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:957

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

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

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◆ GCCH_channel_local_destroy()

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

Destroy locally created channel.

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

Parameters
chchannel to destroy
cclient that caused the destruction
ccnclient number of the client c

Definition at line 1025 of file gnunet-service-cadet_channel.c.

1028 {
1030  "%s asks for destruction of %s\n",
1031  GSC_2s (c),
1032  GCCH_2s (ch));
1033  GNUNET_assert (NULL != c);
1034  if ((NULL != ch->owner) && (c == ch->owner->c) &&
1035  (ccn.channel_of_client == ch->owner->ccn.channel_of_client))
1036  {
1037  free_channel_client (ch->owner);
1038  ch->owner = NULL;
1039  }
1040  else if ((NULL != ch->dest) && (c == ch->dest->c) &&
1041  (ccn.channel_of_client == ch->dest->ccn.channel_of_client))
1042  {
1043  free_channel_client (ch->dest);
1044  ch->dest = NULL;
1045  }
1046  else
1047  {
1048  GNUNET_assert (0);
1049  }
1050 
1051  if (GNUNET_YES == ch->destroy)
1052  {
1053  /* other end already destroyed, with the local client gone, no need
1054  to finish transmissions, just destroy immediately. */
1055  channel_destroy (ch);
1056  return;
1057  }
1058  if ((NULL != ch->head_sent) && ((NULL != ch->owner) || (NULL != ch->dest)))
1059  {
1060  /* Wait for other end to destroy us as well,
1061  and otherwise allow send queue to be transmitted first */
1062  ch->destroy = GNUNET_YES;
1063  return;
1064  }
1065  if ((GNUNET_YES == ch->is_loopback) &&
1066  ((NULL != ch->owner) || (NULL != ch->dest)))
1067  {
1068  if (NULL != ch->retry_control_task)
1069  GNUNET_SCHEDULER_cancel (ch->retry_control_task);
1070  ch->retry_control_task =
1072  return;
1073  }
1074  if (GNUNET_NO == ch->is_loopback)
1075  {
1076  /* If the we ever sent the CHANNEL_CREATE, we need to send a destroy message. */
1077  switch (ch->state)
1078  {
1079  case CADET_CHANNEL_NEW:
1080  /* We gave up on a channel that we created as a client to a remote
1081  target, but that never went anywhere. Nothing to do here. */
1082  break;
1083 
1084  case CADET_CHANNEL_LOOSE:
1085  break;
1086 
1087  default:
1088  GCT_send_channel_destroy (ch->t, ch->ctn);
1089  }
1090  }
1091  /* Nothing left to do, just finish destruction */
1092  channel_destroy (ch);
1093 }
static void free_channel_client(struct CadetChannelClient *ccc)
Release memory associated with ccc.
static void channel_destroy(struct CadetChannel *ch)
Destroy the given channel.
@ CADET_CHANNEL_NEW
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.

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

Referenced by channel_destroy_iterator(), and handle_channel_destroy().

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◆ GCCH_tunnel_up()

void GCCH_tunnel_up ( struct CadetChannel ch)

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

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

Parameters
chthe channel for which the tunnel is now ready

Definition at line 648 of file gnunet-service-cadet_channel.c.

649 {
650  GNUNET_assert (NULL == ch->retry_control_task);
652  "Tunnel up, sending CHANNEL_OPEN on %s now\n",
653  GCCH_2s (ch));
654  ch->retry_control_task = GNUNET_SCHEDULER_add_now (&send_channel_open, ch);
655 }
static void send_channel_open(void *cls)
Send a channel create message.

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

Referenced by notify_tunnel_up_cb().

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◆ GCCH_channel_incoming_new()

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

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

Parameters
ttunnel to the remote peer
chididentifier of this channel in the tunnel
h_porthash of desired local port
optionsoptions for the channel
Returns
handle to the new channel

Definition at line 745 of file gnunet-service-cadet_channel.c.

749 {
750  struct CadetChannel *ch;
751  struct OpenPort *op;
752 
753  ch = GNUNET_new (struct CadetChannel);
754  ch->h_port = *h_port;
755  ch->t = t;
756  ch->ctn = ctn;
757  ch->retry_time = CADET_INITIAL_RETRANSMIT_TIME;
758  ch->nobuffer = GNUNET_NO;
759  ch->reliable = GNUNET_YES;
760  ch->out_of_order = GNUNET_NO;
761  ch->max_pending_messages =
762  (ch->nobuffer) ? 1 : 4; /* FIXME: 4!? Do not hardcode! */
763  GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
764 
766  if (NULL == op)
767  {
768  /* port closed, wait for it to possibly open */
769  ch->state = CADET_CHANNEL_LOOSE;
772  &ch->h_port,
773  ch,
775  GNUNET_assert (NULL == ch->retry_control_task);
776  ch->retry_control_task = GNUNET_SCHEDULER_add_delayed (TIMEOUT_CLOSED_PORT,
778  ch);
780  "Created loose incoming channel to port %s from peer %s\n",
781  GNUNET_h2s (&ch->port),
782  GCP_2s (GCT_get_destination (ch->t)));
783  }
784  else
785  {
786  GCCH_bind (ch, op->c, &op->port);
787  }
788  GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
789  return ch;
790 }
static void timeout_closed_cb(void *cls)
We had an incoming channel to a port that is closed.
#define TIMEOUT_CLOSED_PORT
How long do we wait before dropping state about incoming connection to closed port?
static struct GNUNET_SCHEDULER_Task * t
Main task.
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:1254
struct GNUNET_HashCode h_port
Port hashed with our PID (matches incoming OPEN messages).

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

Referenced by handle_plaintext_channel_open().

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◆ GCCH_handle_duplicate_open()

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

We got a GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN message again for this channel.

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

Parameters
chchannel that got the duplicate open
ctiidentifier of the connection that delivered the message

Definition at line 879 of file gnunet-service-cadet_channel.c.

882 {
883  if (NULL == ch->dest)
884  {
886  "Ignoring duplicate CHANNEL_OPEN on %s: port is closed\n",
887  GCCH_2s (ch));
888  return;
889  }
890  if (NULL != ch->retry_control_task)
891  {
893  "Ignoring duplicate CHANNEL_OPEN on %s: control message is pending\n",
894  GCCH_2s (ch));
895  return;
896  }
898  "Retransmitting CHANNEL_OPEN_ACK on %s\n",
899  GCCH_2s (ch));
900  ch->retry_control_task = GNUNET_SCHEDULER_add_now (&send_open_ack, ch);
901 }

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

Referenced by handle_plaintext_channel_open().

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◆ GCCH_handle_channel_plaintext_data()

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

We got payload data for a channel.

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

Parameters
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 1189 of file gnunet-service-cadet_channel.c.

1193 {
1194  struct GNUNET_MQ_Envelope *env;
1195  struct GNUNET_CADET_LocalData *ld;
1196  struct CadetChannelClient *ccc;
1197  size_t payload_size;
1198  struct CadetOutOfOrderMessage *com;
1199  int duplicate;
1200  uint32_t mid_min;
1201  uint32_t mid_max;
1202  uint32_t mid_msg;
1203  uint32_t delta;
1204 
1205  GNUNET_assert (GNUNET_NO == ch->is_loopback);
1206  if ((NULL == ch->owner) && (NULL == ch->dest))
1207  {
1208  /* This client is gone, but we still have messages to send to
1209  the other end (which is why @a ch is not yet dead). However,
1210  we cannot pass messages to our client anymore. */
1212  "Dropping incoming payload on %s as this end is already closed\n",
1213  GCCH_2s (ch));
1214  /* send back DESTROY notification to stop further retransmissions! */
1215  if (GNUNET_YES == ch->destroy)
1216  GCT_send_channel_destroy (ch->t, ch->ctn);
1217  return;
1218  }
1219  payload_size = ntohs (msg->header.size) - sizeof(*msg);
1220  env = GNUNET_MQ_msg_extra (ld,
1221  payload_size,
1223  ld->ccn = (NULL == ch->dest) ? ch->owner->ccn : ch->dest->ccn;
1224  GNUNET_memcpy (&ld[1], &msg[1], payload_size);
1225  ccc = (NULL != ch->owner) ? ch->owner : ch->dest;
1226  if (GNUNET_YES == ccc->client_ready)
1227  {
1228  /*
1229  * We ad-hoc send the message if
1230  * - The channel is out-of-order
1231  * - The channel is reliable and MID matches next expected MID
1232  * - The channel is unreliable and MID is before lowest seen MID
1233  */if ((GNUNET_YES == ch->out_of_order) ||
1234  ((msg->mid.mid == ch->mid_recv.mid) && (GNUNET_YES == ch->reliable)) ||
1235  ((GNUNET_NO == ch->reliable) &&
1236  (ntohl (msg->mid.mid) >= ntohl (ch->mid_recv.mid)) &&
1237  ((NULL == ccc->head_recv) ||
1238  (ntohl (msg->mid.mid) < ntohl (ccc->head_recv->mid.mid)))))
1239  {
1241  "Giving %u bytes of payload with MID %u from %s to client %s\n",
1242  (unsigned int) payload_size,
1243  ntohl (msg->mid.mid),
1244  GCCH_2s (ch),
1245  GSC_2s (ccc->c));
1246  ccc->client_ready = GNUNET_NO;
1247  GSC_send_to_client (ccc->c, env);
1248  if (GNUNET_NO == ch->out_of_order)
1249  ch->mid_recv.mid = htonl (1 + ntohl (msg->mid.mid));
1250  else
1251  ch->mid_recv.mid = htonl (1 + ntohl (ch->mid_recv.mid));
1252  ch->mid_futures >>= 1;
1253  if ((GNUNET_YES == ch->out_of_order) && (GNUNET_NO == ch->reliable))
1254  {
1255  /* possibly shift by more if we skipped messages */
1256  uint64_t delta = htonl (msg->mid.mid) - 1 - ntohl (ch->mid_recv.mid);
1257 
1258  if (delta > 63)
1259  ch->mid_futures = 0;
1260  else
1261  ch->mid_futures >>= delta;
1262  ch->mid_recv.mid = htonl (1 + ntohl (msg->mid.mid));
1263  }
1265  return;
1266  }
1267  }
1268 
1269  if (GNUNET_YES == ch->reliable)
1270  {
1271  /* check if message ought to be dropped because it is ancient/too distant/duplicate */
1272  mid_min = ntohl (ch->mid_recv.mid);
1273  mid_max = mid_min + ch->max_pending_messages;
1274  mid_msg = ntohl (msg->mid.mid);
1275  if (((uint32_t) (mid_msg - mid_min) > ch->max_pending_messages) ||
1276  ((uint32_t) (mid_max - mid_msg) > ch->max_pending_messages))
1277  {
1279  "%s at %u drops ancient or far-future message %u\n",
1280  GCCH_2s (ch),
1281  (unsigned int) mid_min,
1282  ntohl (msg->mid.mid));
1283 
1285  "# duplicate DATA (ancient or future)",
1286  1,
1287  GNUNET_NO);
1290  return;
1291  }
1292  /* mark bit for future ACKs */
1293  delta = mid_msg - mid_min - 1; /* overflow/underflow are OK here */
1294  if (delta < 64)
1295  {
1296  if (0 != (ch->mid_futures & (1LLU << delta)))
1297  {
1298  /* Duplicate within the queue, drop also */
1300  "Duplicate payload of %u bytes on %s (mid %u) dropped\n",
1301  (unsigned int) payload_size,
1302  GCCH_2s (ch),
1303  ntohl (msg->mid.mid));
1304  GNUNET_STATISTICS_update (stats, "# duplicate DATA", 1, GNUNET_NO);
1307  return;
1308  }
1309  ch->mid_futures |= (1LLU << delta);
1311  "Marked bit %llX for mid %u (base: %u); now: %llX\n",
1312  (1LLU << delta),
1313  mid_msg,
1314  mid_min,
1315  (unsigned long long) ch->mid_futures);
1316  }
1317  }
1318  else /* ! ch->reliable */
1319  {
1320  struct CadetOutOfOrderMessage *next_msg;
1321 
1326  if ((NULL != ccc->head_recv) && (GNUNET_YES == ccc->client_ready))
1327  {
1328  next_msg = ccc->head_recv;
1330  "Giving queued MID %u from %s to client %s\n",
1331  ntohl (next_msg->mid.mid),
1332  GCCH_2s (ch),
1333  GSC_2s (ccc->c));
1334  ccc->client_ready = GNUNET_NO;
1335  GSC_send_to_client (ccc->c, next_msg->env);
1336  ch->mid_recv.mid = htonl (1 + ntohl (next_msg->mid.mid));
1337  ch->mid_futures >>= 1;
1339  GNUNET_CONTAINER_DLL_remove (ccc->head_recv, ccc->tail_recv, next_msg);
1340  ccc->num_recv--;
1341  /* Do not process duplicate MID */
1342  if (msg->mid.mid == next_msg->mid.mid) /* Duplicate */
1343  {
1344  /* Duplicate within the queue, drop */
1346  "Message on %s (mid %u) dropped, duplicate\n",
1347  GCCH_2s (ch),
1348  ntohl (msg->mid.mid));
1349  GNUNET_free (next_msg);
1351  return;
1352  }
1353  GNUNET_free (next_msg);
1354  }
1355 
1356  if (ntohl (msg->mid.mid) < ntohl (ch->mid_recv.mid)) /* Old */
1357  {
1358  /* Duplicate within the queue, drop */
1360  "Message on %s (mid %u) dropped, old.\n",
1361  GCCH_2s (ch),
1362  ntohl (msg->mid.mid));
1364  return;
1365  }
1366 
1367  /* Channel is unreliable, so we do not ACK. But we also cannot
1368  allow buffering everything, so check if we have space... */
1369  if (ccc->num_recv >= ch->max_pending_messages)
1370  {
1371  struct CadetOutOfOrderMessage *drop;
1372 
1373  /* Yep, need to drop. Drop the oldest message in
1374  the buffer. */
1376  "Queue full due slow client on %s, dropping oldest message\n",
1377  GCCH_2s (ch));
1379  "# messages dropped due to slow client",
1380  1,
1381  GNUNET_NO);
1382  drop = ccc->head_recv;
1383  GNUNET_assert (NULL != drop);
1384  GNUNET_CONTAINER_DLL_remove (ccc->head_recv, ccc->tail_recv, drop);
1385  ccc->num_recv--;
1386  GNUNET_MQ_discard (drop->env);
1387  GNUNET_free (drop);
1388  }
1389  }
1390 
1391  /* Insert message into sorted out-of-order queue */
1392  com = GNUNET_new (struct CadetOutOfOrderMessage);
1393  com->mid = msg->mid;
1394  com->env = env;
1395  duplicate = GNUNET_NO;
1397  is_before,
1398  &duplicate,
1399  ccc->head_recv,
1400  ccc->tail_recv,
1401  com);
1402  ccc->num_recv++;
1403  if (GNUNET_YES == duplicate)
1404  {
1405  /* Duplicate within the queue, drop also (this is not covered by
1406  the case above if "delta" >= 64, which could be the case if
1407  max_pending_messages is also >= 64 or if our client is unready
1408  and we are seeing retransmissions of the message our client is
1409  blocked on. */LOG (GNUNET_ERROR_TYPE_DEBUG,
1410  "Duplicate payload of %u bytes on %s (mid %u) dropped\n",
1411  (unsigned int) payload_size,
1412  GCCH_2s (ch),
1413  ntohl (msg->mid.mid));
1414  GNUNET_STATISTICS_update (stats, "# duplicate DATA", 1, GNUNET_NO);
1416  ccc->num_recv--;
1417  GNUNET_MQ_discard (com->env);
1418  GNUNET_free (com);
1420  return;
1421  }
1423  "Queued %s payload of %u bytes on %s-%X(%p) (mid %u, need %u first)\n",
1424  (GNUNET_YES == ccc->client_ready) ? "out-of-order" : "client-not-ready",
1425  (unsigned int) payload_size,
1426  GCCH_2s (ch),
1427  ntohl (ccc->ccn.channel_of_client),
1428  ccc,
1429  ntohl (msg->mid.mid),
1430  ntohl (ch->mid_recv.mid));
1431  /* NOTE: this ACK we _could_ skip, as the packet is out-of-order and
1432  the sender may already be transmitting the previous one. Needs
1433  experimental evaluation to see if/when this ACK helps or
1434  hurts. (We might even want another option.) */
1436 }
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
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.
static int is_before(void *cls, struct CadetOutOfOrderMessage *m1, struct CadetOutOfOrderMessage *m2)
Test if element e1 comes before element e2.
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
#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_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
#define GNUNET_free(ptr)
Wrapper around free.
void GNUNET_MQ_discard(struct GNUNET_MQ_Envelope *mqm)
Discard the message queue message, free all allocated resources.
Definition: mq.c:283
#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:56
#define GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA
Payload client <-> service.
static struct GNUNET_TIME_Relative delta
Definition: speedup.c:35
struct CadetOutOfOrderMessage * head_recv
Head of DLL of messages received out of order or while client was unready.
struct CadetOutOfOrderMessage * tail_recv
Tail DLL of messages received out of order or while client was unready.
unsigned int num_recv
Number of entries currently in head_recv DLL.
List of received out-of-order data messages.
struct ChannelMessageIdentifier mid
ID of the message (messages up to this point needed before we give this one to the client).
struct GNUNET_MQ_Envelope * env
The envelope with the payload of the out-of-order message.
uint32_t mid
Unique ID of the message, cycles around, in NBO.
Message for cadet data traffic.
Definition: cadet.h:253
struct GNUNET_CADET_ClientChannelNumber ccn
ID of the channel.
Definition: cadet.h:262
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format.

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

Referenced by handle_plaintext_data().

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◆ GCCH_handle_channel_plaintext_data_ack()

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

We got an acknowledgement for payload data for a channel.

Possibly resume transmissions.

Parameters
chchannel that got the ack
ctiidentifier of the connection that delivered the message
ackdetails about what was received

Definition at line 1529 of file gnunet-service-cadet_channel.c.

1533 {
1534  struct CadetReliableMessage *crm;
1535  struct CadetReliableMessage *crmn;
1536  int found;
1537  uint32_t mid_base;
1538  uint64_t mid_mask;
1539  unsigned int delta;
1540 
1541  GNUNET_break (GNUNET_NO == ch->is_loopback);
1542  if (GNUNET_NO == ch->reliable)
1543  {
1544  /* not expecting ACKs on unreliable channel, odd */
1545  GNUNET_break_op (0);
1546  return;
1547  }
1548  /* mid_base is the MID of the next message that the
1549  other peer expects (i.e. that is missing!), everything
1550  LOWER (but excluding mid_base itself) was received. */
1551  mid_base = ntohl (ack->mid.mid);
1552  mid_mask = GNUNET_htonll (ack->futures);
1553  found = GNUNET_NO;
1554  for (crm = ch->head_sent; NULL != crm; crm = crmn)
1555  {
1556  crmn = crm->next;
1557  delta = (unsigned int) (ntohl (crm->data_message->mid.mid) - mid_base);
1558  if (delta >= UINT_MAX - ch->max_pending_messages)
1559  {
1560  /* overflow, means crm was a bit in the past, so this ACK counts for it. */
1562  "Got DATA_ACK with base %u satisfying past message %u on %s\n",
1563  (unsigned int) mid_base,
1564  ntohl (crm->data_message->mid.mid),
1565  GCCH_2s (ch));
1566  handle_matching_ack (ch, cti, crm);
1567  found = GNUNET_YES;
1568  continue;
1569  }
1570  delta--;
1571  if (delta >= 64)
1572  continue;
1574  "Testing bit %llX for mid %u (base: %u)\n",
1575  (1LLU << delta),
1576  ntohl (crm->data_message->mid.mid),
1577  mid_base);
1578  if (0 != (mid_mask & (1LLU << delta)))
1579  {
1581  "Got DATA_ACK with mask for %u on %s\n",
1582  ntohl (crm->data_message->mid.mid),
1583  GCCH_2s (ch));
1584  handle_matching_ack (ch, cti, crm);
1585  found = GNUNET_YES;
1586  }
1587  }
1588  if (GNUNET_NO == found)
1589  {
1590  /* ACK for message we already dropped, might have been a
1591  duplicate ACK? Ignore. */
1593  "Duplicate DATA_ACK on %s, ignoring\n",
1594  GCCH_2s (ch));
1595  GNUNET_STATISTICS_update (stats, "# duplicate DATA_ACKs", 1, GNUNET_NO);
1596  return;
1597  }
1598  if (NULL != ch->retry_data_task)
1599  {
1600  GNUNET_SCHEDULER_cancel (ch->retry_data_task);
1601  ch->retry_data_task = NULL;
1602  }
1603  if ((NULL != ch->head_sent) && (NULL == ch->head_sent->qe))
1604  ch->retry_data_task = GNUNET_SCHEDULER_add_at (ch->head_sent->next_retry,
1606  ch);
1607 }
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...
static void retry_transmission(void *cls)
We need to retry a transmission, the last one took too long to be acknowledged.
uint64_t GNUNET_htonll(uint64_t n)
Convert unsigned 64-bit integer to network byte order.
Definition: common_endian.c:36
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
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:1231
Info needed to retry a message in case it gets lost.
struct CadetReliableMessage * next
Double linked list, FIFO style.
struct GNUNET_CADET_ChannelAppDataMessage * data_message
Data message we are trying to send.
struct ChannelMessageIdentifier mid
Unique ID of the payload message.
struct ChannelMessageIdentifier mid
Next message ID expected.
uint64_t futures
Bitfield of already-received newer messages.

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

Referenced by handle_plaintext_data_ack().

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◆ GCCH_handle_channel_open_ack()

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

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

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

Parameters
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)

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

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  {
1133  GNUNET_SCHEDULER_cancel (ch->retry_control_task);
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 }

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

Referenced by GCCH_bind(), and handle_plaintext_channel_open_ack().

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◆ GCCH_handle_remote_destroy()

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

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

Also needs to remove this channel from the tunnel.

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

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

Parameters
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 1611 of file gnunet-service-cadet_channel.c.

1614 {
1615  struct CadetChannelClient *ccc;
1616 
1617  GNUNET_assert (GNUNET_NO == ch->is_loopback);
1619  "Received remote channel DESTROY for %s\n",
1620  GCCH_2s (ch));
1621  if (GNUNET_YES == ch->destroy)
1622  {
1623  /* Local client already gone, this is instant-death. */
1624  channel_destroy (ch);
1625  return;
1626  }
1627  ccc = (NULL != ch->owner) ? ch->owner : ch->dest;
1628  if ((NULL != ccc) && (NULL != ccc->head_recv))
1629  {
1631  "Lost end of transmission due to remote shutdown on %s\n",
1632  GCCH_2s (ch));
1633  /* FIXME: change API to notify client about truncated transmission! */
1634  }
1635  ch->destroy = GNUNET_YES;
1636  if (NULL != ccc)
1637  GSC_handle_remote_channel_destroy (ccc->c, ccc->ccn, ch);
1638  channel_destroy (ch);
1639 }
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.
@ GNUNET_ERROR_TYPE_WARNING

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

Referenced by destroy_remaining_channels(), and handle_plaintext_channel_destroy().

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◆ GCCH_handle_local_data()

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

Handle data given by a client.

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

Parameters
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 1760 of file gnunet-service-cadet_channel.c.

1764 {
1765  struct CadetReliableMessage *crm;
1766 
1767  if (ch->pending_messages >= ch->max_pending_messages)
1768  {
1769  GNUNET_break (0); /* Fails: #5370 */
1770  return GNUNET_SYSERR;
1771  }
1772  if (GNUNET_YES == ch->destroy)
1773  {
1774  /* we are going down, drop messages */
1775  return GNUNET_OK;
1776  }
1777  ch->pending_messages++;
1778 
1779  if (GNUNET_YES == ch->is_loopback)
1780  {
1781  struct CadetChannelClient *receiver;
1782  struct GNUNET_MQ_Envelope *env;
1783  struct GNUNET_CADET_LocalData *ld;
1784  int ack_to_owner;
1785 
1786  env =
1788  if ((NULL != ch->owner) &&
1789  (sender_ccn.channel_of_client == ch->owner->ccn.channel_of_client))
1790  {
1791  receiver = ch->dest;
1792  ack_to_owner = GNUNET_YES;
1793  }
1794  else if ((NULL != ch->dest) &&
1795  (sender_ccn.channel_of_client == ch->dest->ccn.channel_of_client))
1796  {
1797  receiver = ch->owner;
1798  ack_to_owner = GNUNET_NO;
1799  }
1800  else
1801  {
1802  GNUNET_free (env);
1803  GNUNET_break (0);
1804  return GNUNET_SYSERR;
1805  }
1806  GNUNET_assert (NULL != receiver);
1807  ld->ccn = receiver->ccn;
1808  GNUNET_memcpy (&ld[1], buf, buf_len);
1809  if (GNUNET_YES == receiver->client_ready)
1810  {
1811  ch->pending_messages--;
1813  send_ack_to_client (ch, ack_to_owner);
1814  }
1815  else
1816  {
1817  struct CadetOutOfOrderMessage *oom;
1818 
1819  oom = GNUNET_new (struct CadetOutOfOrderMessage);
1820  oom->env = env;
1822  receiver->tail_recv,
1823  oom);
1824  receiver->num_recv++;
1825  }
1826  return GNUNET_OK;
1827  }
1828 
1829  /* Everything is correct, send the message. */
1830  crm = GNUNET_malloc (sizeof(*crm));
1831  crm->ch = ch;
1832  crm->data_message = GNUNET_malloc (
1833  sizeof(struct GNUNET_CADET_ChannelAppDataMessage) + buf_len);
1834  crm->data_message->header.size =
1835  htons (sizeof(struct GNUNET_CADET_ChannelAppDataMessage) + buf_len);
1836  crm->data_message->header.type =
1838  ch->mid_send.mid = htonl (ntohl (ch->mid_send.mid) + 1);
1839  crm->data_message->mid = ch->mid_send;
1840  crm->data_message->ctn = ch->ctn;
1841  GNUNET_memcpy (&crm->data_message[1], buf, buf_len);
1842  GNUNET_CONTAINER_DLL_insert_tail (ch->head_sent, ch->tail_sent, crm);
1844  "Sending message %u from local client to %s with %lu bytes\n",
1845  ntohl (crm->data_message->mid.mid),
1846  GCCH_2s (ch),
1847  (unsigned long) buf_len);
1848  if (NULL != ch->retry_data_task)
1849  {
1850  GNUNET_SCHEDULER_cancel (ch->retry_data_task);
1851  ch->retry_data_task = NULL;
1852  }
1853  crm->qe = GCT_send (ch->t, &crm->data_message->header, &data_sent_cb, crm,
1854  &crm->data_message->ctn);
1855  GNUNET_assert (NULL == ch->retry_data_task);
1856  return GNUNET_OK;
1857 }
static void data_sent_cb(void *cls, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
Function called once the tunnel has sent one of our messages.
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_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
@ GNUNET_OK
Definition: gnunet_common.h:99
@ GNUNET_SYSERR
Definition: gnunet_common.h:97
#define GNUNET_malloc(size)
Wrapper around malloc.
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA
Payload data (inside an encrypted tunnel).
void receiver(void *cls, const void *buf, size_t available, const struct sockaddr *addr, socklen_t addrlen, int errCode)
Callback to read from the SOCKS5 proxy.
Definition: socks.c:329
struct CadetTunnelQueueEntry * qe
Entry in the tunnels queue for this message, NULL if it has left the tunnel.
struct CadetChannel * ch
Which channel is this message in?
Message for cadet data traffic.
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA.
struct GNUNET_CADET_ChannelTunnelNumber ctn
ID of the channel.

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

Referenced by handle_local_data().

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◆ GCCH_handle_local_ack()

void GCCH_handle_local_ack ( struct CadetChannel ch,
struct GNUNET_CADET_ClientChannelNumber  client_ccn 
)

Handle ACK from client on local channel.

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

Parameters
chchannel to destroy
client_ccnccn of the client sending the ack

Definition at line 1861 of file gnunet-service-cadet_channel.c.

1863 {
1864  struct CadetChannelClient *ccc;
1865  struct CadetOutOfOrderMessage *com;
1866 
1867  if ((NULL != ch->owner) &&
1868  (ch->owner->ccn.channel_of_client == client_ccn.channel_of_client))
1869  ccc = ch->owner;
1870  else if ((NULL != ch->dest) &&
1871  (ch->dest->ccn.channel_of_client == client_ccn.channel_of_client))
1872  ccc = ch->dest;
1873  else
1874  GNUNET_assert (0);
1875  ccc->client_ready = GNUNET_YES;
1876  com = ccc->head_recv;
1877  if (NULL == com)
1878  {
1880  "Got LOCAL_ACK, %s-%X ready to receive more data, but none pending on %s-%X(%p)!\n",
1881  GSC_2s (ccc->c),
1882  ntohl (client_ccn.channel_of_client),
1883  GCCH_2s (ch),
1884  ntohl (ccc->ccn.channel_of_client),
1885  ccc);
1886  return; /* none pending */
1887  }
1888  if (GNUNET_YES == ch->is_loopback)
1889  {
1890  int to_owner;
1891 
1892  /* Messages are always in-order, just send */
1894  ccc->num_recv--;
1895  GSC_send_to_client (ccc->c, com->env);
1896  /* Notify sender that we can receive more */
1897  if ((NULL != ch->owner) &&
1898  (ccc->ccn.channel_of_client == ch->owner->ccn.channel_of_client))
1899  {
1900  to_owner = GNUNET_NO;
1901  }
1902  else
1903  {
1904  GNUNET_assert ((NULL != ch->dest) && (ccc->ccn.channel_of_client ==
1905  ch->dest->ccn.channel_of_client));
1906  to_owner = GNUNET_YES;
1907  }
1908  send_ack_to_client (ch, to_owner);
1909  GNUNET_free (com);
1910  return;
1911  }
1912 
1913  if ((com->mid.mid != ch->mid_recv.mid) && (GNUNET_NO == ch->out_of_order) &&
1914  (GNUNET_YES == ch->reliable))
1915  {
1917  "Got LOCAL_ACK, %s-%X ready to receive more data (but next one is out-of-order %u vs. %u)!\n",
1918  GSC_2s (ccc->c),
1919  ntohl (ccc->ccn.channel_of_client),
1920  ntohl (com->mid.mid),
1921  ntohl (ch->mid_recv.mid));
1922  return; /* missing next one in-order */
1923  }
1924 
1926  "Got LOCAL_ACK, giving payload message %u to %s-%X on %s\n",
1927  ntohl (com->mid.mid),
1928  GSC_2s (ccc->c),
1929  ntohl (ccc->ccn.channel_of_client),
1930  GCCH_2s (ch));
1931 
1932  /* all good, pass next message to client */
1934  ccc->num_recv--;
1935  /* FIXME: if unreliable, this is not aggressive
1936  enough, as it would be OK to have lost some! */
1937 
1938  ch->mid_recv.mid = htonl (1 + ntohl (com->mid.mid));
1939  ch->mid_futures >>= 1; /* equivalent to division by 2 */
1940  ccc->client_ready = GNUNET_NO;
1941  GSC_send_to_client (ccc->c, com->env);
1942  GNUNET_free (com);
1944  if (NULL != ccc->head_recv)
1945  return;
1946  if (GNUNET_NO == ch->destroy)
1947  return;
1948  GCT_send_channel_destroy (ch->t, ch->ctn);
1949  channel_destroy (ch);
1950 }

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

Referenced by handle_local_ack().

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