GNUnet 0.21.1
gnunet-service-cadet_tunnels.h File Reference

Information we track per tunnel. More...

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Macros

#define DESIRED_CONNECTIONS_PER_TUNNEL   3
 How many connections would we like to have per tunnel? More...
 

Typedefs

typedef void(* GCT_SendContinuation) (void *cls, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
 Function called when a transmission requested using GCT_send is done. More...
 
typedef void(* GCT_ConnectionIterator) (void *cls, struct CadetTConnection *ct)
 Iterator over connections. More...
 
typedef void(* GCT_ChannelIterator) (void *cls, struct CadetChannel *ch)
 Iterator over channels. More...
 

Enumerations

enum  CadetTunnelEState {
  CADET_TUNNEL_KEY_UNINITIALIZED , CADET_TUNNEL_KEY_AX_SENT , CADET_TUNNEL_KEY_AX_RECV , CADET_TUNNEL_KEY_AX_SENT_AND_RECV ,
  CADET_TUNNEL_KEY_AX_AUTH_SENT , CADET_TUNNEL_KEY_OK
}
 All the encryption states a tunnel can be in. More...
 

Functions

int GCT_alice_or_betty (const struct GNUNET_PeerIdentity *other)
 Am I Alice or Betty (some call her Bob), or talking to myself? More...
 
const char * GCT_2s (const struct CadetTunnel *t)
 Get the static string for the peer this tunnel is directed. More...
 
struct CadetTunnelGCT_create_tunnel (struct CadetPeer *destination)
 Create a tunnel to destination. More...
 
void GCT_destroy_tunnel_now (struct CadetTunnel *t)
 Destroys the tunnel t now, without delay. More...
 
int GCT_add_inbound_connection (struct CadetTunnel *t, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid, struct CadetPeerPath *path)
 Add a connection to the tunnel. More...
 
void GCT_connection_lost (struct CadetTConnection *ct)
 We lost a connection, remove it from our list and clean up the connection object itself. More...
 
struct CadetPeerGCT_get_destination (struct CadetTunnel *t)
 Return the peer to which this tunnel goes. More...
 
void GCT_consider_path (struct CadetTunnel *t, struct CadetPeerPath *p, unsigned int off)
 Consider using the path p for the tunnel t. More...
 
struct GNUNET_CADET_ChannelTunnelNumber GCT_add_channel (struct CadetTunnel *t, struct CadetChannel *ch)
 Add a channel to a tunnel. More...
 
void GCT_remove_channel (struct CadetTunnel *t, struct CadetChannel *ch, struct GNUNET_CADET_ChannelTunnelNumber ctn)
 Remove a channel from a tunnel. More...
 
void GCT_send_channel_destroy (struct CadetTunnel *t, struct GNUNET_CADET_ChannelTunnelNumber ctn)
 Send a DESTROY message via the tunnel. More...
 
struct CadetTunnelQueueEntryGCT_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 provided. More...
 
void GCT_send_cancel (struct CadetTunnelQueueEntry *q)
 Cancel a previously sent message while it's in the queue. More...
 
unsigned int GCT_count_channels (struct CadetTunnel *t)
 Returns the number of channels using a tunnel. More...
 
unsigned int GCT_count_any_connections (const struct CadetTunnel *t)
 Counts the number of connections created for a tunnel, including busy connections. More...
 
void GCT_iterate_connections (struct CadetTunnel *t, GCT_ConnectionIterator iter, void *iter_cls)
 Iterate over all connections of a tunnel. More...
 
void GCT_iterate_channels (struct CadetTunnel *t, GCT_ChannelIterator iter, void *iter_cls)
 Iterate over all channels of a tunnel. More...
 
enum CadetTunnelEState GCT_get_estate (struct CadetTunnel *t)
 Get the encryption state of a tunnel. More...
 
void GCT_change_estate (struct CadetTunnel *t, enum CadetTunnelEState state)
 Change the tunnel encryption state. More...
 
void GCT_handle_kx (struct CadetTConnection *ct, const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg)
 Handle KX message that lacks authentication (and which will thus only be considered authenticated after we respond with our own KX_AUTH and finally successfully decrypt the payload). More...
 
void GCT_handle_kx_auth (struct CadetTConnection *ct, const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage *msg)
 Handle KX_AUTH message. More...
 
void GCT_handle_encrypted (struct CadetTConnection *ct, const struct GNUNET_CADET_TunnelEncryptedMessage *msg)
 Handle encrypted message. More...
 
void GCT_debug (const struct CadetTunnel *t, enum GNUNET_ErrorType level)
 Log all possible info about the tunnel state. More...
 

Detailed Description

Information we track per tunnel.

Author
Bartlomiej Polot
Christian Grothoff

Definition in file gnunet-service-cadet_tunnels.h.

Macro Definition Documentation

◆ DESIRED_CONNECTIONS_PER_TUNNEL

#define DESIRED_CONNECTIONS_PER_TUNNEL   3

How many connections would we like to have per tunnel?

Definition at line 37 of file gnunet-service-cadet_tunnels.h.

Typedef Documentation

◆ GCT_SendContinuation

typedef void(* GCT_SendContinuation) (void *cls, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)

Function called when a transmission requested using GCT_send is done.

Parameters
clsclosure
ctnidentifier of the connection used for transmission, NULL if the transmission failed (to be used to match ACKs to the respective connection for connection performance evaluation)

Definition at line 217 of file gnunet-service-cadet_tunnels.h.

◆ GCT_ConnectionIterator

typedef void(* GCT_ConnectionIterator) (void *cls, struct CadetTConnection *ct)

Iterator over connections.

Parameters
clsclosure
ctone of the connections

Definition at line 281 of file gnunet-service-cadet_tunnels.h.

◆ GCT_ChannelIterator

typedef void(* GCT_ChannelIterator) (void *cls, struct CadetChannel *ch)

Iterator over channels.

Parameters
clsclosure
chone of the channels

Definition at line 305 of file gnunet-service-cadet_tunnels.h.

Enumeration Type Documentation

◆ CadetTunnelEState

All the encryption states a tunnel can be in.

Enumerator
CADET_TUNNEL_KEY_UNINITIALIZED 

Uninitialized status, we need to send KX.

We will stay in this state until the first connection is up.

CADET_TUNNEL_KEY_AX_SENT 

KX message sent, waiting for other peer's KX_AUTH.

CADET_TUNNEL_KEY_AX_RECV 

KX message received, trying to send back KX_AUTH.

CADET_TUNNEL_KEY_AX_SENT_AND_RECV 

KX message sent and received, trying to send back KX_AUTH.

CADET_TUNNEL_KEY_AX_AUTH_SENT 

KX received and we sent KX_AUTH back, but we got no traffic yet, so we're waiting for either KX_AUTH or ENCRYPED traffic from the other peer.

We will not yet send traffic, as this might have been a replay. The other (initiating) peer should send a CHANNEL_OPEN next anyway, and then we are in business!

CADET_TUNNEL_KEY_OK 

Handshake completed: session key available.

Definition at line 43 of file gnunet-service-cadet_tunnels.h.

44{
50
55
60
65
76
81};
@ CADET_TUNNEL_KEY_AX_AUTH_SENT
KX received and we sent KX_AUTH back, but we got no traffic yet, so we're waiting for either KX_AUTH ...
@ CADET_TUNNEL_KEY_AX_SENT
KX message sent, waiting for other peer's KX_AUTH.
@ CADET_TUNNEL_KEY_UNINITIALIZED
Uninitialized status, we need to send KX.
@ CADET_TUNNEL_KEY_AX_SENT_AND_RECV
KX message sent and received, trying to send back KX_AUTH.
@ CADET_TUNNEL_KEY_OK
Handshake completed: session key available.
@ CADET_TUNNEL_KEY_AX_RECV
KX message received, trying to send back KX_AUTH.

Function Documentation

◆ GCT_alice_or_betty()

int GCT_alice_or_betty ( const struct GNUNET_PeerIdentity other)

Am I Alice or Betty (some call her Bob), or talking to myself?

Parameters
otherthe other peer
Returns
GNUNET_YES for Alice, GNUNET_NO for Betty, GNUNET_SYSERR if talking to myself

Definition at line 468 of file gnunet-service-cadet_tunnels.c.

469{
470 if (0 > GNUNET_memcmp (&my_full_id,
471 other))
472 return GNUNET_YES;
473 else if (0 < GNUNET_memcmp (&my_full_id,
474 other))
475 return GNUNET_NO;
476 else
477 {
478 GNUNET_break_op (0);
479 return GNUNET_SYSERR;
480 }
481}
struct GNUNET_PeerIdentity my_full_id
Local peer own ID.
Definition: gnunet-hello.c:101
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
@ GNUNET_YES
@ GNUNET_NO
@ GNUNET_SYSERR
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.

References GNUNET_break_op, GNUNET_memcmp, GNUNET_NO, GNUNET_SYSERR, GNUNET_YES, and my_full_id.

Referenced by GCT_handle_kx(), send_create(), send_kx(), and update_ax_by_kx().

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◆ GCT_2s()

const char * GCT_2s ( const struct CadetTunnel t)

Get the static string for the peer this tunnel is directed.

Parameters
tTunnel.
Returns
Static string the destination peer's ID.

Definition at line 517 of file gnunet-service-cadet_tunnels.c.

518{
519 static char buf[64];
520
521 if (NULL == t)
522 return "Tunnel(NULL)";
523 GNUNET_snprintf (buf,
524 sizeof(buf),
525 "Tunnel %s",
526 GNUNET_i2s (GCP_get_id (t->destination)));
527 return buf;
528}
const struct GNUNET_PeerIdentity * GCP_get_id(struct CadetPeer *cp)
Obtain the peer identity for a struct CadetPeer.
static struct GNUNET_SCHEDULER_Task * t
Main task.
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.

References GCP_get_id(), GNUNET_i2s(), GNUNET_snprintf(), and t.

Referenced by connection_ready_cb(), consider_path_cb(), destroy_tunnel(), GCC_2s(), GCCH_bind(), GCCH_channel_local_new(), GCCH_debug(), GCP_drop_tunnel(), GCT_add_channel(), GCT_add_inbound_connection(), GCT_change_estate(), GCT_consider_path(), GCT_debug(), GCT_handle_encrypted(), GCT_handle_kx(), GCT_handle_kx_auth(), GCT_remove_channel(), GCT_send(), handle_plaintext_channel_destroy(), handle_plaintext_channel_open(), handle_plaintext_channel_open_ack(), handle_plaintext_keepalive(), maintain_connections_cb(), retry_kx(), send_keepalive(), send_kx(), send_kx_auth(), try_send_normal_payload(), and update_state().

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◆ GCT_create_tunnel()

struct CadetTunnel * GCT_create_tunnel ( struct CadetPeer destination)

Create a tunnel to destination.

Must only be called from within GCP_get_tunnel().

Parameters
destinationwhere to create the tunnel to
Returns
new tunnel to destination

Definition at line 3137 of file gnunet-service-cadet_tunnels.c.

3138{
3139 struct CadetTunnel *t = GNUNET_new (struct CadetTunnel);
3141 GNUNET_MQ_hd_fixed_size (plaintext_keepalive,
3143 struct GNUNET_MessageHeader,
3144 t),
3145 GNUNET_MQ_hd_var_size (plaintext_data,
3148 t),
3149 GNUNET_MQ_hd_fixed_size (plaintext_data_ack,
3152 t),
3153 GNUNET_MQ_hd_fixed_size (plaintext_channel_open,
3156 t),
3157 GNUNET_MQ_hd_fixed_size (plaintext_channel_open_ack,
3160 t),
3161 GNUNET_MQ_hd_fixed_size (plaintext_channel_destroy,
3164 t),
3166 };
3167
3168 t->kx_retry_delay = INITIAL_KX_RETRY_DELAY;
3169 new_ephemeral (&t->ax);
3171 t->destination = destination;
3173 t->maintain_connections_task
3175 t);
3176 t->mq = GNUNET_MQ_queue_for_callbacks (NULL,
3177 NULL,
3178 NULL,
3179 NULL,
3180 handlers,
3182 t);
3184 t);
3185 return t;
3186}
struct GNUNET_MQ_MessageHandlers handlers[]
Definition: 003.c:1
static void new_ephemeral(struct CadetTunnelAxolotl *ax)
Create a new Axolotl ephemeral (ratchet) key.
static int handle_decrypted(void *cls, const struct GNUNET_MessageHeader *msg)
Handles a message we decrypted, by injecting it into our message queue (which will do the dispatching...
static void decrypted_error_cb(void *cls, enum GNUNET_MQ_Error error)
Function called if we had an error processing an incoming decrypted message.
static void maintain_connections_cb(void *cls)
Function called to maintain the connections underlying our tunnel.
#define INITIAL_KX_RETRY_DELAY
How long do we wait initially before retransmitting the KX? TODO: replace by 2 RTT if/once we have co...
void GNUNET_CRYPTO_ecdhe_key_create(struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:451
struct GNUNET_CONTAINER_MultiHashMap32 * GNUNET_CONTAINER_multihashmap32_create(unsigned int len)
Create a 32-bit key multi hash map.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
struct GNUNET_MQ_Handle * GNUNET_MQ_queue_for_callbacks(GNUNET_MQ_SendImpl send, GNUNET_MQ_DestroyImpl destroy, GNUNET_MQ_CancelImpl cancel, void *impl_state, const struct GNUNET_MQ_MessageHandler *handlers, GNUNET_MQ_ErrorHandler error_handler, void *cls)
Create a message queue for the specified handlers.
Definition: mq.c:465
#define GNUNET_MQ_handler_end()
End-marker for the handlers array.
#define GNUNET_MQ_hd_var_size(name, code, str, ctx)
#define GNUNET_MQ_hd_fixed_size(name, code, str, ctx)
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN
Ask the cadet service to create a new channel.
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK
Confirm payload data end-to-end.
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA
Payload data (inside an encrypted tunnel).
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE
Announce connection is still alive (direction sensitive).
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY
Ask the cadet service to destroy a channel.
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK
Confirm the creation of a channel.
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:1305
struct GNUNET_MessageStreamTokenizer * GNUNET_MST_create(GNUNET_MessageTokenizerCallback cb, void *cb_cls)
Create a message stream tokenizer.
Definition: mst.c:86
Struct containing all information regarding a tunnel to a peer.
Message for cadet data traffic.
Message to acknowledge end-to-end data.
Message to destroy a channel of type GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY.
Message to acknowledge opening a channel of type GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK.
Message to create a Channel.
Message handler for a specific message type.
Header for all communications.

References decrypted_error_cb(), GNUNET_CONTAINER_multihashmap32_create(), GNUNET_CRYPTO_ecdhe_key_create(), GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK, GNUNET_MQ_handler_end, GNUNET_MQ_hd_fixed_size, GNUNET_MQ_hd_var_size, GNUNET_MQ_queue_for_callbacks(), GNUNET_MST_create(), GNUNET_new, GNUNET_SCHEDULER_add_now(), handle_decrypted(), handlers, INITIAL_KX_RETRY_DELAY, maintain_connections_cb(), new_ephemeral(), and t.

Referenced by GCP_get_tunnel().

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◆ GCT_destroy_tunnel_now()

void GCT_destroy_tunnel_now ( struct CadetTunnel t)

Destroys the tunnel t now, without delay.

Used during shutdown.

Parameters
ttunnel to destroy

Definition at line 2305 of file gnunet-service-cadet_tunnels.c.

2306{
2310 t);
2311 GNUNET_assert (0 ==
2313 if (NULL != t->destroy_task)
2314 {
2315 GNUNET_SCHEDULER_cancel (t->destroy_task);
2316 t->destroy_task = NULL;
2317 }
2318 destroy_tunnel (t);
2319}
int shutting_down
Signal that shutdown is happening: prevent recovery measures.
unsigned int GCT_count_channels(struct CadetTunnel *t)
Returns the number of channels using a tunnel.
static void destroy_tunnel(void *cls)
This tunnel is no longer used, destroy it.
static int destroy_remaining_channels(void *cls, uint32_t key, void *value)
Destroy remaining channels during shutdown.
int GNUNET_CONTAINER_multihashmap32_iterate(struct GNUNET_CONTAINER_MultiHashMap32 *map, GNUNET_CONTAINER_MultiHashMapIterator32Callback it, void *it_cls)
Iterate over all entries in the map.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:981

References destroy_remaining_channels(), destroy_tunnel(), GCT_count_channels(), GNUNET_assert, GNUNET_CONTAINER_multihashmap32_iterate(), GNUNET_SCHEDULER_cancel(), GNUNET_YES, shutting_down, and t.

Referenced by destroy_tunnels_now().

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◆ GCT_add_inbound_connection()

int GCT_add_inbound_connection ( struct CadetTunnel t,
const struct GNUNET_CADET_ConnectionTunnelIdentifier cid,
struct CadetPeerPath path 
)

Add a connection to the tunnel.

Parameters
ta tunnel
cidconnection identifier to use for the connection
pathpath to use for the connection
Returns
GNUNET_OK on success, GNUNET_SYSERR on failure (duplicate connection)

Definition at line 3190 of file gnunet-service-cadet_tunnels.c.

3194{
3195 struct CadetTConnection *ct;
3196
3197 ct = GNUNET_new (struct CadetTConnection);
3199 ct->t = t;
3200 ct->cc = GCC_create_inbound (t->destination,
3201 path,
3202 ct,
3203 cid,
3205 ct);
3206 if (NULL == ct->cc)
3207 {
3209 "%s refused inbound %s (duplicate)\n",
3210 GCT_2s (t),
3211 GCC_2s (ct->cc));
3212 GNUNET_free (ct);
3213 return GNUNET_SYSERR;
3214 }
3215 /* FIXME: schedule job to kill connection (and path?) if it takes
3216 too long to get ready! (And track performance data on how long
3217 other connections took with the tunnel!)
3218 => Note: to be done within 'connection'-logic! */
3219 GNUNET_CONTAINER_DLL_insert (t->connection_busy_head,
3220 t->connection_busy_tail,
3221 ct);
3222 t->num_busy_connections++;
3224 "%s has new %s\n",
3225 GCT_2s (t),
3226 GCC_2s (ct->cc));
3227 return GNUNET_OK;
3228}
const char * GCC_2s(const struct CadetConnection *cc)
Get a (static) string for a connection.
struct CadetConnection * GCC_create_inbound(struct CadetPeer *destination, struct CadetPeerPath *path, struct CadetTConnection *ct, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid, GCC_ReadyCallback ready_cb, void *ready_cb_cls)
Create a connection to destination via path and notify cb whenever we are ready for more data.
static void connection_ready_cb(void *cls, int is_ready)
A connection is is_ready for transmission.
#define LOG(level,...)
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
@ GNUNET_OK
@ GNUNET_ERROR_TYPE_DEBUG
#define GNUNET_free(ptr)
Wrapper around free.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get(void)
Get the current time.
Definition: time.c:111
Entry in list of connections used by tunnel, with metadata.
struct CadetConnection * cc
Connection handle.
struct GNUNET_TIME_Absolute created
Creation time, to keep oldest connection alive.
struct CadetTunnel * t
Tunnel this connection belongs to.

References CadetTConnection::cc, connection_ready_cb(), CadetTConnection::created, GCC_2s(), GCC_create_inbound(), GCT_2s(), GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_new, GNUNET_OK, GNUNET_SYSERR, GNUNET_TIME_absolute_get(), LOG, t, and CadetTConnection::t.

Referenced by handle_connection_create().

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◆ GCT_connection_lost()

void GCT_connection_lost ( struct CadetTConnection ct)

We lost a connection, remove it from our list and clean up the connection object itself.

Parameters
ctbinding of connection to tunnel of the connection that was lost.

Definition at line 2146 of file gnunet-service-cadet_tunnels.c.

2147{
2148 struct CadetTunnel *t = ct->t;
2149
2150 if (GNUNET_YES == ct->is_ready)
2151 {
2152 GNUNET_CONTAINER_DLL_remove (t->connection_ready_head,
2153 t->connection_ready_tail,
2154 ct);
2155 t->num_ready_connections--;
2156 }
2157 else
2158 {
2159 GNUNET_CONTAINER_DLL_remove (t->connection_busy_head,
2160 t->connection_busy_tail,
2161 ct);
2162 t->num_busy_connections--;
2163 }
2164 GNUNET_free (ct);
2165}
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
int is_ready
Is the connection currently ready for transmission?

References GNUNET_CONTAINER_DLL_remove, GNUNET_free, GNUNET_YES, CadetTConnection::is_ready, t, and CadetTConnection::t.

Referenced by destroy_t_connection(), GCC_create_inbound(), and GCC_destroy_without_core().

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◆ GCT_get_destination()

struct CadetPeer * GCT_get_destination ( struct CadetTunnel t)

Return the peer to which this tunnel goes.

Parameters
ta tunnel
Returns
the destination of the tunnel

Definition at line 573 of file gnunet-service-cadet_tunnels.c.

574{
575 return t->destination;
576}

References t.

Referenced by GCCH_2s(), GCCH_bind(), GCCH_channel_incoming_new(), get_next_free_ctn(), and timeout_closed_cb().

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◆ GCT_consider_path()

void GCT_consider_path ( struct CadetTunnel t,
struct CadetPeerPath p,
unsigned int  off 
)

Consider using the path p for the tunnel t.

The tunnel destination is at offset off in path p.

Parameters
tour tunnel
pa path to our destination
offoffset of the destination on path path

Definition at line 2821 of file gnunet-service-cadet_tunnels.c.

2824{
2826 "Considering %s for %s (offset %u)\n",
2827 GCPP_2s (p),
2828 GCT_2s (t),
2829 off);
2830 (void) consider_path_cb (t,
2831 p,
2832 off);
2833}
const char * GCPP_2s(struct CadetPeerPath *path)
Convert a path to a human-readable string.
static int consider_path_cb(void *cls, struct CadetPeerPath *path, unsigned int off)
Consider using the path p for the tunnel t.
static struct GNUNET_OS_Process * p
Helper process we started.
Definition: gnunet-uri.c:38

References consider_path_cb(), GCPP_2s(), GCT_2s(), GNUNET_ERROR_TYPE_DEBUG, LOG, p, and t.

Referenced by GCP_path_entry_add(), and GCP_set_mq().

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◆ GCT_add_channel()

struct GNUNET_CADET_ChannelTunnelNumber GCT_add_channel ( struct CadetTunnel t,
struct CadetChannel ch 
)

Add a channel to a tunnel.

Parameters
tTunnel.
chChannel
Returns
unique number identifying ch within t

Add a channel to a tunnel.

Otherwise that notification will be done later in notify_tunnel_up_cb().

Parameters
tTunnel.
chChannel
Returns
unique number identifying ch within t

Definition at line 2087 of file gnunet-service-cadet_tunnels.c.

2089{
2091
2092 ctn = get_next_free_ctn (t);
2093 if (NULL != t->destroy_task)
2094 {
2095 GNUNET_SCHEDULER_cancel (t->destroy_task);
2096 t->destroy_task = NULL;
2097 }
2100 ntohl (ctn.cn),
2101 ch,
2104 "Adding %s to %s with state %d\n",
2105 GCCH_2s (ch),
2106 GCT_2s (t),
2107 t->estate);
2108 switch (t->estate)
2109 {
2111 /* waiting for connection to start KX */
2112 break;
2113
2117 /* we're currently waiting for KX to complete */
2118 break;
2119
2121 /* waiting for OTHER peer to send us data,
2122 we might need to prompt more aggressively! */
2123 if (NULL == t->kx_task)
2124 t->kx_task
2125 = GNUNET_SCHEDULER_add_at (t->next_kx_attempt,
2126 &retry_kx,
2127 t);
2128 break;
2129
2131 /* We are ready. Tell the new channel that we are up. */
2133 break;
2134 }
2135 return ctn;
2136}
static struct GNUNET_CADET_Channel * ch
Channel handle.
Definition: gnunet-cadet.c:117
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
void GCCH_tunnel_up(struct CadetChannel *ch)
Function called once and only once after a channel was bound to its tunnel via GCT_add_channel() is r...
static struct GNUNET_CADET_ChannelTunnelNumber get_next_free_ctn(struct CadetTunnel *t)
Compute the next free channel tunnel number for this tunnel.
static void retry_kx(void *cls)
Try to redo the KX or KX_AUTH handshake, if we can.
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multihashmap32_put(struct GNUNET_CONTAINER_MultiHashMap32 *map, uint32_t key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
@ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY
There must only be one value per key; storing a value should fail if a value under the same key alrea...
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:1255
Number identifying a CADET channel within a tunnel.

References CADET_TUNNEL_KEY_AX_AUTH_SENT, CADET_TUNNEL_KEY_AX_RECV, CADET_TUNNEL_KEY_AX_SENT, CADET_TUNNEL_KEY_AX_SENT_AND_RECV, CADET_TUNNEL_KEY_OK, CADET_TUNNEL_KEY_UNINITIALIZED, ch, GNUNET_CADET_ChannelTunnelNumber::cn, GCCH_2s(), GCCH_tunnel_up(), GCT_2s(), get_next_free_ctn(), GNUNET_assert, GNUNET_CONTAINER_multihashmap32_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY, GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_at(), GNUNET_SCHEDULER_cancel(), GNUNET_YES, LOG, retry_kx(), and t.

Referenced by GCCH_channel_local_new().

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◆ GCT_remove_channel()

void GCT_remove_channel ( struct CadetTunnel t,
struct CadetChannel ch,
struct GNUNET_CADET_ChannelTunnelNumber  ctn 
)

Remove a channel from a tunnel.

Parameters
tTunnel.
chChannel
ctnunique number identifying ch within t

Definition at line 2254 of file gnunet-service-cadet_tunnels.c.

2257{
2259 "Removing %s from %s\n",
2260 GCCH_2s (ch),
2261 GCT_2s (t));
2264 ntohl (ctn.cn),
2265 ch));
2266 if ((0 ==
2267 GCT_count_channels (t)) &&
2268 (NULL == t->destroy_task))
2269 {
2270 t->destroy_task
2273 t);
2274 }
2275}
#define IDLE_DESTROY_DELAY
How long do we wait until tearing down an idle tunnel?
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multihashmap32_remove(struct GNUNET_CONTAINER_MultiHashMap32 *map, uint32_t key, const void *value)
Remove the given key-value pair from the map.
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:1278
uint32_t cn
Which number does this channel have that uniquely identfies it within its tunnel, in network byte ord...

References ch, GNUNET_CADET_ChannelTunnelNumber::cn, destroy_tunnel(), GCCH_2s(), GCT_2s(), GCT_count_channels(), GNUNET_assert, GNUNET_CONTAINER_multihashmap32_remove(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_delayed(), GNUNET_YES, IDLE_DESTROY_DELAY, LOG, and t.

Referenced by channel_destroy().

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◆ GCT_send_channel_destroy()

void GCT_send_channel_destroy ( struct CadetTunnel t,
struct GNUNET_CADET_ChannelTunnelNumber  ctn 
)

Send a DESTROY message via the tunnel.

Parameters
tthe tunnel to transmit over
ctnID of the channel to destroy

Definition at line 2997 of file gnunet-service-cadet_tunnels.c.

2999{
3001
3003 "Sending DESTROY message for channel ID %u\n",
3004 ntohl (ctn.cn));
3005 msg.header.size = htons (sizeof(msg));
3007 msg.reserved = htonl (0);
3008 msg.ctn = ctn;
3009 GCT_send (t,
3010 &msg.header,
3011 NULL,
3012 NULL,
3013 &ctn);
3014}
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
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...
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format.
struct GNUNET_CADET_ChannelTunnelNumber ctn
ID of the channel.

References GNUNET_CADET_ChannelTunnelNumber::cn, GNUNET_CADET_ChannelDestroyMessage::ctn, GCT_send(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY, LOG, msg, GNUNET_MessageHeader::size, t, and GNUNET_MessageHeader::type.

Referenced by GCCH_channel_local_destroy(), GCCH_handle_channel_plaintext_data(), GCCH_handle_local_ack(), handle_plaintext_channel_open_ack(), handle_plaintext_data(), and handle_plaintext_data_ack().

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◆ GCT_send()

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 provided.

Parameters
messageMessage to send. Function modifies it.
tTunnel on which this message is transmitted.
contContinuation to call once message is really sent.
cont_clsClosure for cont.
Returns
Handle to cancel message.

Definition at line 3413 of file gnunet-service-cadet_tunnels.c.

3418{
3419 struct CadetTunnelQueueEntry *tq;
3420 uint16_t payload_size;
3421 struct GNUNET_MQ_Envelope *env;
3423 struct CadetChannel *ch;
3424
3425 if (NULL != ctn)
3426 {
3427 ch = lookup_channel (t,
3428 *ctn);
3429 if ((NULL != ch) && GCCH_is_type_to_drop (ch, message))
3430 {
3431 GNUNET_break (0);
3432 return NULL;
3433 }
3434 }
3435
3436 if (CADET_TUNNEL_KEY_OK != t->estate)
3437 {
3438 GNUNET_break (0);
3439 return NULL;
3440 }
3441 payload_size = ntohs (message->size);
3443 "Encrypting %u bytes for %s\n",
3444 (unsigned int) payload_size,
3445 GCT_2s (t));
3446 env = GNUNET_MQ_msg_extra (ax_msg,
3447 payload_size,
3449 t_ax_encrypt (&t->ax,
3450 &ax_msg[1],
3451 message,
3452 payload_size);
3454 "# encrypted bytes",
3455 payload_size,
3456 GNUNET_NO);
3457 ax_msg->ax_header.Ns = htonl (t->ax.Ns++);
3458 ax_msg->ax_header.PNs = htonl (t->ax.PNs);
3459 /* FIXME: we should do this once, not once per message;
3460 this is a point multiplication, and DHRs does not
3461 change all the time. */
3463 &ax_msg->ax_header.DHRs);
3464 t_h_encrypt (&t->ax,
3465 ax_msg);
3466 t_hmac (&ax_msg->ax_header,
3467 sizeof(struct GNUNET_CADET_AxHeader) + payload_size,
3468 0,
3469 &t->ax.HKs,
3470 &ax_msg->hmac);
3471
3472 tq = GNUNET_malloc (sizeof(*tq));
3473 tq->t = t;
3474 tq->env = env;
3475 tq->cid = &ax_msg->cid; /* will initialize 'ax_msg->cid' once we know the connection */
3476 tq->cont = cont;
3477 tq->cont_cls = cont_cls;
3479 t->tq_tail,
3480 tq);
3481 if (NULL != t->send_task)
3482 GNUNET_SCHEDULER_cancel (t->send_task);
3483 t->send_task
3485 t);
3486 return tq;
3487}
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
int GCCH_is_type_to_drop(struct CadetChannel *ch, const struct GNUNET_MessageHeader *message)
Check if type of message is the one to drop.
static void t_hmac(const void *plaintext, size_t size, uint32_t iv, const struct GNUNET_CRYPTO_SymmetricSessionKey *key, struct GNUNET_ShortHashCode *hmac)
Calculate HMAC.
static void trigger_transmissions(void *cls)
Called when either we have a new connection, or a new message in the queue, or some existing connecti...
static void t_h_encrypt(struct CadetTunnelAxolotl *ax, struct GNUNET_CADET_TunnelEncryptedMessage *msg)
Encrypt header with the axolotl header key.
static void t_ax_encrypt(struct CadetTunnelAxolotl *ax, void *dst, const void *src, size_t size)
Encrypt data with the axolotl tunnel key.
struct CadetChannel * lookup_channel(struct CadetTunnel *t, struct GNUNET_CADET_ChannelTunnelNumber ctn)
Lookup a channel by its ctn.
static struct GNUNET_STATISTICS_Handle * stats
Handle to the statistics service.
void GNUNET_CRYPTO_ecdhe_key_get_public(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, struct GNUNET_CRYPTO_EcdhePublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:214
#define GNUNET_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
#define GNUNET_malloc(size)
Wrapper around malloc.
#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:63
#define GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED
Axolotl encrypted data.
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 containing all information regarding a channel to a remote client.
struct GNUNET_CADET_ChannelTunnelNumber ctn
Number identifying this channel in its tunnel.
Struct used to save messages in a non-ready tunnel to send once connected.
struct GNUNET_MQ_Envelope * env
Envelope of message to send follows.
GCT_SendContinuation cont
Continuation to call once sent (on the channel layer).
struct GNUNET_CADET_ConnectionTunnelIdentifier * cid
Where to put the connection identifier into the payload of the message in env once we have it?
void * cont_cls
Closure for cont.
struct CadetTunnel * t
Tunnel these messages belong in.
Encrypted axolotl header with numbers that identify which keys in which ratchet are to be used to dec...
uint32_t PNs
Number of messages sent with the previous ratchet key.
struct GNUNET_CRYPTO_EcdhePublicKey DHRs
Current ratchet key.
uint32_t Ns
Number of messages sent with the current ratchet key.
Axolotl-encrypted tunnel message with application payload.
struct GNUNET_CADET_AxHeader ax_header
Axolotl-header that specifies which keys to use in which ratchet to decrypt the body that follows.
struct GNUNET_CADET_ConnectionTunnelIdentifier cid
ID of the connection.
struct GNUNET_ShortHashCode hmac
MAC of the encrypted message, used to verify message integrity.

References GNUNET_CADET_TunnelEncryptedMessage::ax_header, CADET_TUNNEL_KEY_OK, ch, GNUNET_CADET_TunnelEncryptedMessage::cid, CadetTunnelQueueEntry::cid, CadetTunnelQueueEntry::cont, CadetTunnelQueueEntry::cont_cls, CadetChannel::ctn, GNUNET_CADET_AxHeader::DHRs, env, CadetTunnelQueueEntry::env, GCCH_is_type_to_drop(), GCT_2s(), GNUNET_break, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_CRYPTO_ecdhe_key_get_public(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_malloc, GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED, GNUNET_MQ_msg_extra, GNUNET_NO, GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_update(), GNUNET_CADET_TunnelEncryptedMessage::hmac, LOG, lookup_channel(), GNUNET_CADET_AxHeader::Ns, GNUNET_CADET_AxHeader::PNs, GNUNET_MessageHeader::size, stats, t, CadetTunnelQueueEntry::t, t_ax_encrypt(), t_h_encrypt(), t_hmac(), and trigger_transmissions().

Referenced by GCCH_handle_local_data(), GCT_send_channel_destroy(), retry_transmission(), send_channel_data_ack(), send_channel_open(), send_keepalive(), and send_open_ack().

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◆ GCT_send_cancel()

void GCT_send_cancel ( struct CadetTunnelQueueEntry q)

Cancel a previously sent message while it's in the queue.

ONLY can be called before the continuation given to the send function is called. Once the continuation is called, the message is no longer in the queue!

Parameters
qHandle to the queue entry to cancel.

Definition at line 3491 of file gnunet-service-cadet_tunnels.c.

3492{
3493 struct CadetTunnel *t = tq->t;
3494
3496 t->tq_tail,
3497 tq);
3498 GNUNET_MQ_discard (tq->env);
3499 GNUNET_free (tq);
3500}
void GNUNET_MQ_discard(struct GNUNET_MQ_Envelope *mqm)
Discard the message queue message, free all allocated resources.
Definition: mq.c:285

References CadetTunnelQueueEntry::env, GNUNET_CONTAINER_DLL_remove, GNUNET_free, GNUNET_MQ_discard(), t, and CadetTunnelQueueEntry::t.

Referenced by channel_destroy(), destroy_tunnel(), GCC_destroy(), handle_matching_ack(), send_channel_data_ack(), send_channel_open(), and send_open_ack().

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◆ GCT_count_channels()

unsigned int GCT_count_channels ( struct CadetTunnel t)

Returns the number of channels using a tunnel.

Parameters
tTunnel in question.
Returns
Number of channels using the tunnel.

Definition at line 580 of file gnunet-service-cadet_tunnels.c.

581{
582 return GNUNET_CONTAINER_multihashmap32_size (t->channels);
583}
unsigned int GNUNET_CONTAINER_multihashmap32_size(const struct GNUNET_CONTAINER_MultiHashMap32 *map)
Get the number of key-value pairs in the map.

References GNUNET_CONTAINER_multihashmap32_size(), and t.

Referenced by connection_ready_cb(), destroy_tunnel(), GCT_destroy_tunnel_now(), GCT_remove_channel(), get_all_tunnels_iterator(), and retry_kx().

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◆ GCT_count_any_connections()

unsigned int GCT_count_any_connections ( const struct CadetTunnel t)

Counts the number of connections created for a tunnel, including busy connections.

Parameters
tTunnel to be counted.
Returns
Number of connections created for the tunnel.

Definition at line 603 of file gnunet-service-cadet_tunnels.c.

604{
605 return t->num_ready_connections + t->num_busy_connections;
606}

References t.

Referenced by consider_path_cb(), GCT_debug(), get_all_tunnels_iterator(), and maintain_connections_cb().

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◆ GCT_iterate_connections()

void GCT_iterate_connections ( struct CadetTunnel t,
GCT_ConnectionIterator  iter,
void *  iter_cls 
)

Iterate over all connections of a tunnel.

Parameters
tTunnel whose connections to iterate.
iterIterator.
iter_clsClosure for iter.

Definition at line 3511 of file gnunet-service-cadet_tunnels.c.

3514{
3515 struct CadetTConnection *n;
3516
3517 for (struct CadetTConnection *ct = t->connection_ready_head;
3518 NULL != ct;
3519 ct = n)
3520 {
3521 n = ct->next;
3522 iter (iter_cls,
3523 ct);
3524 }
3525 for (struct CadetTConnection *ct = t->connection_busy_head;
3526 NULL != ct;
3527 ct = n)
3528 {
3529 n = ct->next;
3530 iter (iter_cls,
3531 ct);
3532 }
3533}
struct CadetTConnection * next
Next in DLL.

References CadetTConnection::next, and t.

Referenced by consider_path_cb(), destroy_tunnel(), and maintain_connections_cb().

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◆ GCT_iterate_channels()

void GCT_iterate_channels ( struct CadetTunnel t,
GCT_ChannelIterator  iter,
void *  iter_cls 
)

Iterate over all channels of a tunnel.

Parameters
tTunnel whose channels to iterate.
iterIterator.
iter_clsClosure for iter.

Definition at line 3583 of file gnunet-service-cadet_tunnels.c.

3586{
3587 struct ChanIterCls ctx;
3588
3589 ctx.iter = iter;
3590 ctx.iter_cls = iter_cls;
3593 &ctx);
3594}
static struct GNUNET_FS_Handle * ctx
static int iterate_channels_cb(void *cls, uint32_t key, void *value)
Helper function for GCT_iterate_channels.
Closure for iterate_channels_cb.
void * iter_cls
Closure for iter.
GCT_ChannelIterator iter
Function to call.

References ctx, GNUNET_CONTAINER_multihashmap32_iterate(), ChanIterCls::iter, ChanIterCls::iter_cls, iterate_channels_cb(), and t.

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◆ GCT_get_estate()

enum CadetTunnelEState GCT_get_estate ( struct CadetTunnel t)

Get the encryption state of a tunnel.

Parameters
tTunnel.
Returns
Tunnel's encryption state.

Definition at line 635 of file gnunet-service-cadet_tunnels.c.

636{
637 return t->estate;
638}

References t.

Referenced by get_all_tunnels_iterator(), handle_connection_create(), send_create(), and send_keepalive().

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◆ GCT_change_estate()

void GCT_change_estate ( struct CadetTunnel t,
enum CadetTunnelEState  state 
)

Change the tunnel encryption state.

If the encryption state changes to OK, stop the rekey task.

Parameters
tTunnel whose encryption state to change, or NULL.
stateNew encryption state.

Definition at line 1284 of file gnunet-service-cadet_tunnels.c.

1286{
1287 enum CadetTunnelEState old = t->estate;
1288
1289 t->estate = state;
1291 "%s estate changed from %s to %s\n",
1292 GCT_2s (t),
1293 estate2s (old),
1294 estate2s (state));
1295
1296 if ((CADET_TUNNEL_KEY_OK != old) &&
1297 (CADET_TUNNEL_KEY_OK == t->estate))
1298 {
1299 if (NULL != t->kx_task)
1300 {
1301 GNUNET_SCHEDULER_cancel (t->kx_task);
1302 t->kx_task = NULL;
1303 }
1304 /* notify all channels that have been waiting */
1307 t);
1308 if (NULL != t->send_task)
1309 GNUNET_SCHEDULER_cancel (t->send_task);
1311 t);
1312 }
1313}
enum State state
current state of profiling
static int notify_tunnel_up_cb(void *cls, uint32_t key, void *value)
Our tunnel became ready for the first time, notify channels that have been waiting.
static const char * estate2s(enum CadetTunnelEState es)
Get string description for tunnel encryption state.
CadetTunnelEState
All the encryption states a tunnel can be in.

References CADET_TUNNEL_KEY_OK, estate2s(), GCT_2s(), GNUNET_CONTAINER_multihashmap32_iterate(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), LOG, notify_tunnel_up_cb(), state, t, and trigger_transmissions().

Referenced by GCT_handle_encrypted(), GCT_handle_kx(), GCT_handle_kx_auth(), handle_connection_create(), send_kx(), and send_kx_auth().

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◆ GCT_handle_kx()

void GCT_handle_kx ( struct CadetTConnection ct,
const struct GNUNET_CADET_TunnelKeyExchangeMessage msg 
)

Handle KX message that lacks authentication (and which will thus only be considered authenticated after we respond with our own KX_AUTH and finally successfully decrypt the payload).

Parameters
ctconnection/tunnel combo that received encrypted message
msgthe key exchange message

Definition at line 1696 of file gnunet-service-cadet_tunnels.c.

1698{
1699 struct CadetTunnel *t = ct->t;
1700 int ret;
1701
1703 "# KX received",
1704 1,
1705 GNUNET_NO);
1706 if (GNUNET_YES ==
1707 GCT_alice_or_betty (GCP_get_id (t->destination)))
1708 {
1709 /* Betty/Bob is not allowed to send KX! */
1710 GNUNET_break_op (0);
1711 return;
1712 }
1714 "Received KX message from %s with ephemeral %s from %s on connection %s\n",
1715 GCT_2s (t),
1716 GNUNET_e2s (&msg->ephemeral_key),
1717 GNUNET_i2s (GCP_get_id (t->destination)),
1718 GCC_2s (ct->cc));
1719#if 1
1720 if ((0 ==
1721 memcmp (&t->ax.DHRr,
1722 &msg->ratchet_key,
1723 sizeof(msg->ratchet_key))) &&
1724 (0 ==
1725 memcmp (&t->ax.last_ephemeral,
1726 &msg->ephemeral_key,
1727 sizeof(msg->ephemeral_key))))
1728
1729 {
1731 "# Duplicate KX received",
1732 1,
1733 GNUNET_NO);
1734 send_kx_auth (t,
1735 ct,
1736 &t->ax,
1737 GNUNET_NO);
1738 return;
1739 }
1740#endif
1741 /* We only keep ONE unverified KX around, so if there is an existing one,
1742 clean it up. */
1743 if (NULL != t->unverified_ax)
1744 {
1745 if ((0 ==
1746 memcmp (&t->unverified_ax->DHRr,
1747 &msg->ratchet_key,
1748 sizeof(msg->ratchet_key))) &&
1749 (0 ==
1750 memcmp (&t->unverified_ax->last_ephemeral,
1751 &msg->ephemeral_key,
1752 sizeof(msg->ephemeral_key))))
1753 {
1755 "# Duplicate unverified KX received",
1756 1,
1757 GNUNET_NO);
1758#if 1
1759 send_kx_auth (t,
1760 ct,
1761 t->unverified_ax,
1762 GNUNET_NO);
1763 return;
1764#endif
1765 }
1767 "Dropping old unverified KX state.\n");
1769 "# Unverified KX dropped for fresh KX",
1770 1,
1771 GNUNET_NO);
1772 GNUNET_break (NULL == t->unverified_ax->skipped_head);
1773 memset (t->unverified_ax,
1774 0,
1775 sizeof(struct CadetTunnelAxolotl));
1776 }
1777 else
1778 {
1780 "Creating fresh unverified KX for %s\n",
1781 GCT_2s (t));
1783 "# Fresh KX setup",
1784 1,
1785 GNUNET_NO);
1786 t->unverified_ax = GNUNET_new (struct CadetTunnelAxolotl);
1787 }
1788 /* Set as the 'current' RK/DHRr the one we are currently using,
1789 so that the duplicate-detection logic of
1790 #update_ax_by_kx can work. */
1791 t->unverified_ax->RK = t->ax.RK;
1792 t->unverified_ax->DHRr = t->ax.DHRr;
1793 t->unverified_ax->DHRs = t->ax.DHRs;
1794 t->unverified_ax->kx_0 = t->ax.kx_0;
1795 t->unverified_attempts = 0;
1796
1797 /* Update 'ax' by the new key material */
1798 ret = update_ax_by_kx (t->unverified_ax,
1799 GCP_get_id (t->destination),
1800 &msg->ephemeral_key,
1801 &msg->ratchet_key);
1803 if (GNUNET_OK != ret)
1804 {
1806 "# Useless KX",
1807 1,
1808 GNUNET_NO);
1809 return; /* duplicate KX, nothing to do */
1810 }
1811 /* move ahead in our state machine */
1812 if (CADET_TUNNEL_KEY_UNINITIALIZED == t->estate)
1815 else if (CADET_TUNNEL_KEY_AX_SENT == t->estate)
1818
1819 /* KX is still not done, try again our end. */
1820 if (CADET_TUNNEL_KEY_OK != t->estate)
1821 {
1822 if (NULL != t->kx_task)
1823 GNUNET_SCHEDULER_cancel (t->kx_task);
1824 t->kx_task
1826 t);
1827 }
1828}
static int ret
Final status code.
Definition: gnunet-arm.c:94
void GCT_change_estate(struct CadetTunnel *t, enum CadetTunnelEState state)
Change the tunnel encryption state.
static void send_kx_auth(struct CadetTunnel *t, struct CadetTConnection *ct, struct CadetTunnelAxolotl *ax, int force_reply)
Send a KX_AUTH message.
static int update_ax_by_kx(struct CadetTunnelAxolotl *ax, const struct GNUNET_PeerIdentity *pid, const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key, const struct GNUNET_CRYPTO_EcdhePublicKey *ratchet_key)
Update our Axolotl key state based on the KX data we received.
int GCT_alice_or_betty(const struct GNUNET_PeerIdentity *other)
Am I Alice or Betty (some call her Bob), or talking to myself?
const char * GNUNET_e2s(const struct GNUNET_CRYPTO_EcdhePublicKey *p)
Convert a public key value to a string (for printing debug messages).
Axolotl data, according to https://github.com/trevp/axolotl/wiki .

References CADET_TUNNEL_KEY_AX_RECV, CADET_TUNNEL_KEY_AX_SENT, CADET_TUNNEL_KEY_AX_SENT_AND_RECV, CADET_TUNNEL_KEY_OK, CADET_TUNNEL_KEY_UNINITIALIZED, CadetTConnection::cc, GCC_2s(), GCP_get_id(), GCT_2s(), GCT_alice_or_betty(), GCT_change_estate(), GNUNET_break, GNUNET_break_op, GNUNET_e2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_i2s(), GNUNET_new, GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_update(), GNUNET_SYSERR, GNUNET_YES, LOG, msg, ret, retry_kx(), send_kx_auth(), stats, t, CadetTConnection::t, and update_ax_by_kx().

Referenced by GCC_handle_kx().

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◆ GCT_handle_kx_auth()

void GCT_handle_kx_auth ( struct CadetTConnection ct,
const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage msg 
)

Handle KX_AUTH message.

Parameters
ctconnection/tunnel combo that received encrypted message
msgthe key exchange message

Definition at line 1906 of file gnunet-service-cadet_tunnels.c.

1908{
1909 struct CadetTunnel *t = ct->t;
1910 struct CadetTunnelAxolotl ax_tmp;
1911 struct GNUNET_HashCode kx_auth;
1912 int ret;
1913
1915 "# KX_AUTH received",
1916 1,
1917 GNUNET_NO);
1918 if ((CADET_TUNNEL_KEY_UNINITIALIZED == t->estate) ||
1919 (CADET_TUNNEL_KEY_AX_RECV == t->estate))
1920 {
1921 /* Confusing, we got a KX_AUTH before we even send our own
1922 KX. This should not happen. We'll send our own KX ASAP anyway,
1923 so let's ignore this here. */
1924 GNUNET_break_op (0);
1925 return;
1926 }
1928 "Handling KX_AUTH message from %s with ephemeral %s\n",
1929 GCT_2s (t),
1930 GNUNET_e2s (&msg->kx.ephemeral_key));
1931 /* We do everything in ax_tmp until we've checked the authentication
1932 so we don't clobber anything we care about by accident. */
1933 ax_tmp = t->ax;
1934
1935 /* Update 'ax' by the new key material */
1936 ret = update_ax_by_kx (&ax_tmp,
1937 GCP_get_id (t->destination),
1938 &msg->kx.ephemeral_key,
1939 &msg->kx.ratchet_key);
1940 if (GNUNET_OK != ret)
1941 {
1942 if (GNUNET_NO == ret)
1944 "# redundant KX_AUTH received",
1945 1,
1946 GNUNET_NO);
1947 else
1948 GNUNET_break (0); /* connect to self!? */
1949 return;
1950 }
1951 GNUNET_CRYPTO_hash (&ax_tmp.RK,
1952 sizeof(ax_tmp.RK),
1953 &kx_auth);
1954 if (0 != GNUNET_memcmp (&kx_auth,
1955 &msg->auth))
1956 {
1957 /* This KX_AUTH is not using the latest KX/KX_AUTH data
1958 we transmitted to the sender, refuse it, try KX again. */
1960 "# KX_AUTH not using our last KX received (auth failure)",
1961 1,
1962 GNUNET_NO);
1964 "KX AUTH mismatch!\n");
1965#if DEBUG_KX
1966 {
1967 struct GNUNET_CRYPTO_EcdhePublicKey ephemeral_key;
1968
1970 &ephemeral_key);
1971 if (0 != GNUNET_memcmp (&ephemeral_key,
1972 &msg->r_ephemeral_key_XXX))
1973 {
1975 "My ephemeral is %s!\n",
1976 GNUNET_e2s (&ephemeral_key));
1978 "Response is for ephemeral %s!\n",
1979 GNUNET_e2s (&msg->r_ephemeral_key_XXX));
1980 }
1981 else
1982 {
1983 test_crypto_bug (&ax_tmp.kx_0,
1984 &msg->kx.ephemeral_key_XXX,
1986 &msg->kx.private_key_XXX);
1987 }
1988 }
1989#endif
1990 if (NULL == t->kx_task)
1991 t->kx_task
1992 = GNUNET_SCHEDULER_add_at (t->next_kx_attempt,
1993 &retry_kx,
1994 t);
1995 return;
1996 }
1997 /* Yep, we're good. */
1998 t->ax = ax_tmp;
1999 if (NULL != t->unverified_ax)
2000 {
2001 /* We got some "stale" KX before, drop that. */
2002 cleanup_ax (t->unverified_ax);
2003 GNUNET_free (t->unverified_ax);
2004 t->unverified_ax = NULL;
2005 }
2006
2007 /* move ahead in our state machine */
2008 switch (t->estate)
2009 {
2012 /* Checked above, this is impossible. */
2013 GNUNET_assert (0);
2014 break;
2015
2016 case CADET_TUNNEL_KEY_AX_SENT: /* This is the normal case */
2017 case CADET_TUNNEL_KEY_AX_SENT_AND_RECV: /* both peers started KX */
2018 case CADET_TUNNEL_KEY_AX_AUTH_SENT: /* both peers now did KX_AUTH */
2021 break;
2022
2024 /* Did not expect another KX_AUTH, but so what, still acceptable.
2025 Nothing to do here. */
2026 break;
2027 }
2028 if (0 != (GNUNET_CADET_KX_FLAG_FORCE_REPLY & ntohl (msg->kx.flags)))
2029 {
2030 send_kx_auth (t,
2031 NULL,
2032 &t->ax,
2033 GNUNET_NO);
2034 }
2035}
@ GNUNET_CADET_KX_FLAG_FORCE_REPLY
The peer should reply with its KX details?
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
Definition: gnunet-hello.c:96
static void cleanup_ax(struct CadetTunnelAxolotl *ax)
Cleanup state used by ax.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:41
@ GNUNET_ERROR_TYPE_WARNING
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and encr...
A 512-bit hashcode.

References CADET_TUNNEL_KEY_AX_AUTH_SENT, CADET_TUNNEL_KEY_AX_RECV, CADET_TUNNEL_KEY_AX_SENT, CADET_TUNNEL_KEY_AX_SENT_AND_RECV, CADET_TUNNEL_KEY_OK, CADET_TUNNEL_KEY_UNINITIALIZED, cleanup_ax(), GCP_get_id(), GCT_2s(), GCT_change_estate(), GNUNET_assert, GNUNET_break, GNUNET_break_op, GNUNET_CADET_KX_FLAG_FORCE_REPLY, GNUNET_CRYPTO_ecdhe_key_get_public(), GNUNET_CRYPTO_hash(), GNUNET_e2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_memcmp, GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_add_at(), GNUNET_STATISTICS_update(), CadetTunnelAxolotl::kx_0, LOG, msg, my_private_key, ret, retry_kx(), CadetTunnelAxolotl::RK, send_kx_auth(), stats, t, CadetTConnection::t, and update_ax_by_kx().

Referenced by GCC_handle_kx_auth().

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◆ GCT_handle_encrypted()

void GCT_handle_encrypted ( struct CadetTConnection ct,
const struct GNUNET_CADET_TunnelEncryptedMessage msg 
)

Handle encrypted message.

Parameters
ctconnection/tunnel combo that received encrypted message
msgthe encrypted message to decrypt

Definition at line 3238 of file gnunet-service-cadet_tunnels.c.

3240{
3241 struct CadetTunnel *t = ct->t;
3242 uint16_t size = ntohs (msg->header.size);
3243 char cbuf[size] GNUNET_ALIGN;
3244 ssize_t decrypted_size;
3245
3247 "%s received %u bytes of encrypted data in state %d\n",
3248 GCT_2s (t),
3249 (unsigned int) size,
3250 t->estate);
3251
3252 switch (t->estate)
3253 {
3256 /* We did not even SEND our KX, how can the other peer
3257 send us encrypted data? Must have been that we went
3258 down and the other peer still things we are up.
3259 Let's send it KX back. */
3261 "# received encrypted without any KX",
3262 1,
3263 GNUNET_NO);
3264 if (NULL != t->kx_task)
3265 {
3266 GNUNET_SCHEDULER_cancel (t->kx_task);
3267 t->kx_task = NULL;
3268 }
3269 send_kx (t,
3270 ct,
3271 &t->ax);
3272 return;
3273
3275 /* We send KX, and other peer send KX to us at the same time.
3276 Neither KX is AUTH'ed, so let's try KX_AUTH this time. */
3278 "# received encrypted without KX_AUTH",
3279 1,
3280 GNUNET_NO);
3281 if (NULL != t->kx_task)
3282 {
3283 GNUNET_SCHEDULER_cancel (t->kx_task);
3284 t->kx_task = NULL;
3285 }
3286 send_kx_auth (t,
3287 ct,
3288 &t->ax,
3289 GNUNET_YES);
3290 return;
3291
3293 /* We did not get the KX of the other peer, but that
3294 might have been lost. Send our KX again immediately. */
3296 "# received encrypted without KX",
3297 1,
3298 GNUNET_NO);
3299 if (NULL != t->kx_task)
3300 {
3301 GNUNET_SCHEDULER_cancel (t->kx_task);
3302 t->kx_task = NULL;
3303 }
3304 send_kx (t,
3305 ct,
3306 &t->ax);
3307 return;
3308
3310 /* Great, first payload, we might graduate to OK! */
3312 /* We are up and running, all good. */
3313 break;
3314 }
3315
3316 decrypted_size = -1;
3317 if (CADET_TUNNEL_KEY_OK == t->estate)
3318 {
3319 /* We have well-established key material available,
3320 try that. (This is the common case.) */
3321 decrypted_size = t_ax_decrypt_and_validate (&t->ax,
3322 cbuf,
3323 msg,
3324 size);
3325 }
3326
3327 if ((-1 == decrypted_size) &&
3328 (NULL != t->unverified_ax))
3329 {
3330 /* We have un-authenticated KX material available. We should try
3331 this as a back-up option, in case the sender crashed and
3332 switched keys. */
3333 decrypted_size = t_ax_decrypt_and_validate (t->unverified_ax,
3334 cbuf,
3335 msg,
3336 size);
3337 if (-1 != decrypted_size)
3338 {
3339 /* It worked! Treat this as authentication of the AX data! */
3340 cleanup_ax (&t->ax);
3341 t->ax = *t->unverified_ax;
3342 GNUNET_free (t->unverified_ax);
3343 t->unverified_ax = NULL;
3344 }
3345 if (CADET_TUNNEL_KEY_AX_AUTH_SENT == t->estate)
3346 {
3347 /* First time it worked, move tunnel into production! */
3350 if (NULL != t->send_task)
3351 GNUNET_SCHEDULER_cancel (t->send_task);
3353 t);
3354 }
3355 }
3356 if (NULL != t->unverified_ax)
3357 {
3358 /* We had unverified KX material that was useless; so increment
3359 counter and eventually move to ignore it. Note that we even do
3360 this increment if we successfully decrypted with the old KX
3361 material and thus didn't even both with the new one. This is
3362 the ideal case, as a malicious injection of bogus KX data
3363 basically only causes us to increment a counter a few times. */t->unverified_attempts++;
3365 "Failed to decrypt message with unverified KX data %u times\n",
3366 t->unverified_attempts);
3367 if (t->unverified_attempts > MAX_UNVERIFIED_ATTEMPTS)
3368 {
3369 cleanup_ax (t->unverified_ax);
3370 GNUNET_free (t->unverified_ax);
3371 t->unverified_ax = NULL;
3372 }
3373 }
3374
3375 if (-1 == decrypted_size)
3376 {
3377 /* Decryption failed for good, complain. */
3379 "%s failed to decrypt and validate encrypted data, retrying KX\n",
3380 GCT_2s (t));
3382 "# unable to decrypt",
3383 1,
3384 GNUNET_NO);
3385 if (NULL != t->kx_task)
3386 {
3387 GNUNET_SCHEDULER_cancel (t->kx_task);
3388 t->kx_task = NULL;
3389 }
3390 send_kx (t,
3391 ct,
3392 &t->ax);
3393 return;
3394 }
3396 "# decrypted bytes",
3397 decrypted_size,
3398 GNUNET_NO);
3399
3400 /* The MST will ultimately call #handle_decrypted() on each message. */
3401 t->current_ct = ct;
3404 cbuf,
3405 decrypted_size,
3406 GNUNET_YES,
3407 GNUNET_NO));
3408 t->current_ct = NULL;
3409}
#define MAX_UNVERIFIED_ATTEMPTS
How often do we try to decrypt payload with unverified key material? Used to limit CPU increase upon ...
static void send_kx(struct CadetTunnel *t, struct CadetTConnection *ct, struct CadetTunnelAxolotl *ax)
Send a KX message.
static ssize_t t_ax_decrypt_and_validate(struct CadetTunnelAxolotl *ax, void *dst, const struct GNUNET_CADET_TunnelEncryptedMessage *src, size_t size)
Decrypt and verify data with the appropriate tunnel key and verify that the data has not been altered...
#define GNUNET_ALIGN
gcc-ism to force alignment; we use this to align char-arrays that may then be cast to 'struct's.
enum GNUNET_GenericReturnValue GNUNET_MST_from_buffer(struct GNUNET_MessageStreamTokenizer *mst, const char *buf, size_t size, int purge, int one_shot)
Add incoming data to the receive buffer and call the callback for all complete messages.
Definition: mst.c:101
static unsigned int size
Size of the "table".
Definition: peer.c:68

References CADET_TUNNEL_KEY_AX_AUTH_SENT, CADET_TUNNEL_KEY_AX_RECV, CADET_TUNNEL_KEY_AX_SENT, CADET_TUNNEL_KEY_AX_SENT_AND_RECV, CADET_TUNNEL_KEY_OK, CADET_TUNNEL_KEY_UNINITIALIZED, cleanup_ax(), GCT_2s(), GCT_change_estate(), GNUNET_ALIGN, GNUNET_break_op, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_MST_from_buffer(), GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_update(), GNUNET_YES, LOG, MAX_UNVERIFIED_ATTEMPTS, msg, send_kx(), send_kx_auth(), GNUNET_MessageHeader::size, size, stats, t, CadetTConnection::t, t_ax_decrypt_and_validate(), and trigger_transmissions().

Referenced by GCC_handle_encrypted().

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◆ GCT_debug()

void GCT_debug ( const struct CadetTunnel t,
enum GNUNET_ErrorType  level 
)

Log all possible info about the tunnel state.

Parameters
tTunnel to debug.
levelDebug level to use.

Definition at line 3629 of file gnunet-service-cadet_tunnels.c.

3631{
3632#if ! defined(GNUNET_CULL_LOGGING)
3633 struct CadetTConnection *iter_c;
3634 int do_log;
3635
3637 "cadet-tun",
3638 __FILE__, __FUNCTION__, __LINE__);
3639 if (0 == do_log)
3640 return;
3641
3642 LOG2 (level,
3643 "TTT TUNNEL TOWARDS %s in estate %s tq_len: %u #cons: %u\n",
3644 GCT_2s (t),
3645 estate2s (t->estate),
3646 t->tq_len,
3648 LOG2 (level,
3649 "TTT channels:\n");
3652 &level);
3653 LOG2 (level,
3654 "TTT connections:\n");
3655 for (iter_c = t->connection_ready_head; NULL != iter_c; iter_c = iter_c->next)
3656 GCC_debug (iter_c->cc,
3657 level);
3658 for (iter_c = t->connection_busy_head; NULL != iter_c; iter_c = iter_c->next)
3659 GCC_debug (iter_c->cc,
3660 level);
3661
3662 LOG2 (level,
3663 "TTT TUNNEL END\n");
3664#endif
3665}
void GCC_debug(struct CadetConnection *cc, enum GNUNET_ErrorType level)
Log connection info.
static int debug_channel(void *cls, uint32_t key, void *value)
Call GCCH_debug() on a channel.
unsigned int GCT_count_any_connections(const struct CadetTunnel *t)
Counts the number of connections created for a tunnel, including busy connections.
#define LOG2(level,...)
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 CadetTConnection::cc, debug_channel(), estate2s(), GCC_debug(), GCT_2s(), GCT_count_any_connections(), GNUNET_CONTAINER_multihashmap32_iterate(), GNUNET_ERROR_TYPE_BULK, GNUNET_get_log_call_status(), LOG2, CadetTConnection::next, and t.

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