/*
This file is part of GNUnet.
- Copyright (C) 2001-2015 GNUnet e.V.
+ Copyright (C) 2001-2017 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
+
/**
* @file cadet/gnunet-service-cadet_connection.c
- * @brief GNUnet CADET service connection handling
+ * @brief management of CORE-level end-to-end connections; establishes
+ * end-to-end routes and transmits messages along the route
* @author Bartlomiej Polot
+ * @author Christian Grothoff
*/
#include "platform.h"
-#include "gnunet_util_lib.h"
+#include "gnunet-service-cadet_connection.h"
+#include "gnunet-service-cadet_channel.h"
+#include "gnunet-service-cadet_paths.h"
+#include "gnunet-service-cadet_tunnels.h"
+#include "gnunet_cadet_service.h"
#include "gnunet_statistics_service.h"
-#include "cadet_path.h"
#include "cadet_protocol.h"
-#include "cadet.h"
-#include "gnunet-service-cadet_connection.h"
-#include "gnunet-service-cadet_peer.h"
-#include "gnunet-service-cadet_tunnel.h"
-
-
-/**
- * Should we run somewhat expensive checks on our invariants?
- */
-#define CHECK_INVARIANTS 0
-
-
-#define LOG(level, ...) GNUNET_log_from (level,"cadet-con",__VA_ARGS__)
-#define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-con",__VA_ARGS__)
-
-
-#define CADET_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
- GNUNET_TIME_UNIT_MINUTES,\
- 10)
-#define AVG_MSGS 32
-
-
-/******************************************************************************/
-/******************************** STRUCTS **********************************/
-/******************************************************************************/
-
-/**
- * Handle for messages queued but not yet sent.
- */
-struct CadetConnectionQueue
-{
-
- struct CadetConnectionQueue *next;
- struct CadetConnectionQueue *prev;
-
- /**
- * Peer queue handle, to cancel if necessary.
- */
- struct CadetPeerQueue *peer_q;
-
- /**
- * Continuation to call once sent.
- */
- GCC_sent cont;
- /**
- * Closure for @e cont.
- */
- void *cont_cls;
- /**
- * Was this a forced message? (Do not account for it)
- */
- int forced;
-};
+#define LOG(level, ...) GNUNET_log_from(level,"cadet-con",__VA_ARGS__)
/**
- * Struct to encapsulate all the Flow Control information to a peer to which
- * we are directly connected (on a core level).
+ * All the states a connection can be in.
*/
-struct CadetFlowControl
+enum CadetConnectionState
{
/**
- * Connection this controls.
- */
- struct CadetConnection *c;
-
- struct CadetConnectionQueue *q_head;
- struct CadetConnectionQueue *q_tail;
-
- /**
- * How many messages are in the queue on this connection.
- */
- unsigned int queue_n;
-
- /**
- * How many messages do we accept in the queue.
- * If 0, the connection is broken in this direction (next hop disconnected).
- */
- unsigned int queue_max;
-
- /**
- * ID of the next packet to send.
- */
- uint32_t next_pid;
-
- /**
- * ID of the last packet sent towards the peer.
- */
- uint32_t last_pid_sent;
-
- /**
- * ID of the last packet received from the peer.
- */
- uint32_t last_pid_recv;
-
- /**
- * Bitmap of past 32 messages received:
- * - LSB being @c last_pid_recv.
- * - MSB being @c last_pid_recv - 31 (mod UINTMAX).
- */
- uint32_t recv_bitmap;
-
- /**
- * Last ACK sent to the peer (peer can't send more than this PID).
- */
- uint32_t last_ack_sent;
-
- /**
- * Last ACK sent towards the origin (for traffic towards leaf node).
- */
- uint32_t last_ack_recv;
-
- /**
- * Task to poll the peer in case of a lost ACK causes stall.
- */
- struct GNUNET_SCHEDULER_Task *poll_task;
-
- /**
- * How frequently to poll for ACKs.
- */
- struct GNUNET_TIME_Relative poll_time;
-
- /**
- * Queued poll message, to cancel if not necessary anymore (got ACK).
+ * Uninitialized status, we have not yet even gotten the message queue.
*/
- struct CadetConnectionQueue *poll_msg;
+ CADET_CONNECTION_NEW,
/**
- * Queued poll message, to cancel if not necessary anymore (got ACK).
+ * Connection create message in queue, awaiting transmission by CORE.
*/
- struct CadetConnectionQueue *ack_msg;
-};
+ CADET_CONNECTION_SENDING_CREATE,
-/**
- * Keep a record of the last messages sent on this connection.
- */
-struct CadetConnectionPerformance
-{
/**
- * Circular buffer for storing measurements.
+ * Connection create message sent, waiting for ACK.
*/
- double usecsperbyte[AVG_MSGS];
+ CADET_CONNECTION_SENT,
/**
- * Running average of @c usecsperbyte.
+ * We are an inbound connection, and received a CREATE. Need to
+ * send an CREATE_ACK back.
*/
- double avg;
+ CADET_CONNECTION_CREATE_RECEIVED,
/**
- * How many values of @c usecsperbyte are valid.
+ * Connection confirmed, ready to carry traffic.
*/
- uint16_t size;
+ CADET_CONNECTION_READY
- /**
- * Index of the next "free" position in @c usecsperbyte.
- */
- uint16_t idx;
};
/**
- * Struct containing all information regarding a connection to a peer.
+ * Low-level connection to a destination.
*/
struct CadetConnection
{
- /**
- * Tunnel this connection is part of.
- */
- struct CadetTunnel *t;
-
- /**
- * Flow control information for traffic fwd.
- */
- struct CadetFlowControl fwd_fc;
/**
- * Flow control information for traffic bck.
+ * ID of the connection.
*/
- struct CadetFlowControl bck_fc;
+ struct GNUNET_CADET_ConnectionTunnelIdentifier cid;
/**
- * Measure connection performance on the endpoint.
+ * To which peer does this connection go?
*/
- struct CadetConnectionPerformance *perf;
+ struct CadetPeer *destination;
/**
- * ID of the connection.
+ * Which tunnel is using this connection?
*/
- struct GNUNET_CADET_Hash id;
+ struct CadetTConnection *ct;
/**
- * Path being used for the tunnel. At the origin of the connection
- * it's a pointer to the destination's path pool, otherwise just a copy.
+ * Path we are using to our destination.
*/
struct CadetPeerPath *path;
/**
- * Task to keep the used paths alive at the owner,
- * time tunnel out on all the other peers.
- */
- struct GNUNET_SCHEDULER_Task *fwd_maintenance_task;
-
- /**
- * Task to keep the used paths alive at the destination,
- * time tunnel out on all the other peers.
+ * Pending message, NULL if we are ready to transmit.
*/
- struct GNUNET_SCHEDULER_Task *bck_maintenance_task;
+ struct GNUNET_MQ_Envelope *env;
/**
- * Queue handle for maintainance traffic. One handle for FWD and BCK since
- * one peer never needs to maintain both directions (no loopback connections).
+ * Handle for calling #GCP_request_mq_cancel() once we are finished.
*/
- struct CadetPeerQueue *maintenance_q;
+ struct GCP_MessageQueueManager *mq_man;
/**
- * Should equal #get_next_hop(), or NULL if that peer disconnected.
+ * Task for connection maintenance.
*/
- struct CadetPeer *next_peer;
+ struct GNUNET_SCHEDULER_Task *task;
/**
- * Should equal #get_prev_hop(), or NULL if that peer disconnected.
+ * Queue entry for keepalive messages.
*/
- struct CadetPeer *prev_peer;
+ struct CadetTunnelQueueEntry *keepalive_qe;
/**
- * State of the connection.
+ * Function to call once we are ready to transmit.
*/
- enum CadetConnectionState state;
+ GCC_ReadyCallback ready_cb;
/**
- * Position of the local peer in the path.
+ * Closure for @e ready_cb.
*/
- unsigned int own_pos;
+ void *ready_cb_cls;
/**
- * Pending message count.
+ * How long do we wait before we try again with a CREATE message?
*/
- unsigned int pending_messages;
+ struct GNUNET_TIME_Relative retry_delay;
/**
- * Destroy flag:
- * - if 0, connection in use.
- * - if 1, destroy on last message.
- * - if 2, connection is being destroyed don't re-enter.
+ * Performance metrics for this connection.
*/
- int destroy;
+ struct CadetConnectionMetrics metrics;
/**
- * In-connection-map flag. Sometimes, when @e destroy is set but
- * actual destruction is delayed to enable us to finish processing
- * queues (i.e. in the direction that is still working), we remove
- * the connection from the map to prevent it from still being
- * found (and used) by accident. This flag is set to #GNUNET_YES
- * for a connection that is not in the #connections map. Should
- * only be #GNUNET_YES if #destroy is also non-zero.
+ * State of the connection.
*/
- int was_removed;
+ enum CadetConnectionState state;
/**
- * Counter to do exponential backoff when creating a connection (max 64).
+ * Options for the route, control buffering.
*/
- unsigned short create_retry;
+ enum GNUNET_CADET_ChannelOption options;
/**
- * Task to check if connection has duplicates.
+ * How many latency observations did we make for this connection?
*/
- struct GNUNET_SCHEDULER_Task *check_duplicates_task;
-};
-
-
-/******************************************************************************/
-/******************************* GLOBALS ***********************************/
-/******************************************************************************/
-
-/**
- * Global handle to the statistics service.
- */
-extern struct GNUNET_STATISTICS_Handle *stats;
-
-/**
- * Local peer own ID (memory efficient handle).
- */
-extern GNUNET_PEER_Id myid;
-
-/**
- * Local peer own ID (full value).
- */
-extern struct GNUNET_PeerIdentity my_full_id;
-
-/**
- * Connections known, indexed by cid (CadetConnection).
- */
-static struct GNUNET_CONTAINER_MultiHashMap *connections;
-
-/**
- * How many connections are we willing to maintain.
- * Local connections are always allowed,
- * even if there are more connections than max.
- */
-static unsigned long long max_connections;
-
-/**
- * How many messages *in total* are we willing to queue, divide by number of
- * connections to get connection queue size.
- */
-static unsigned long long max_msgs_queue;
-
-/**
- * How often to send path keepalives. Paths timeout after 4 missed.
- */
-static struct GNUNET_TIME_Relative refresh_connection_time;
-
-/**
- * How often to send path create / ACKs.
- */
-static struct GNUNET_TIME_Relative create_connection_time;
-
-
-/******************************************************************************/
-/******************************** STATIC ***********************************/
-/******************************************************************************/
-
-
-
-#if 0 // avoid compiler warning for unused static function
-static void
-fc_debug (struct CadetFlowControl *fc)
-{
- LOG (GNUNET_ERROR_TYPE_DEBUG, " IN: %u/%u\n",
- fc->last_pid_recv, fc->last_ack_sent);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " OUT: %u/%u\n",
- fc->last_pid_sent, fc->last_ack_recv);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " QUEUE: %u/%u\n",
- fc->queue_n, fc->queue_max);
-}
-
-static void
-connection_debug (struct CadetConnection *c)
-{
- if (NULL == c)
- {
- LOG (GNUNET_ERROR_TYPE_INFO, "DEBUG NULL CONNECTION\n");
- return;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s:%X\n",
- peer2s (c->t->peer), GCC_2s (c));
- LOG (GNUNET_ERROR_TYPE_DEBUG, " state: %u, pending msgs: %u\n",
- c->state, c->pending_messages);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
- fc_debug (&c->fwd_fc);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
- fc_debug (&c->bck_fc);
-}
-#endif
+ unsigned int latency_datapoints;
+ /**
+ * Offset of our @e destination in @e path.
+ */
+ unsigned int off;
-/**
- * Schedule next keepalive task, taking in consideration
- * the connection state and number of retries.
- *
- * @param c Connection for which to schedule the next keepalive.
- * @param fwd Direction for the next keepalive.
- */
-static void
-schedule_next_keepalive (struct CadetConnection *c, int fwd);
-
-
-/**
- * Resets the connection timeout task, some other message has done the
- * task's job.
- * - For the first peer on the direction this means to send
- * a keepalive or a path confirmation message (either create or ACK).
- * - For all other peers, this means to destroy the connection,
- * due to lack of activity.
- * Starts the timeout if no timeout was running (connection just created).
- *
- * @param c Connection whose timeout to reset.
- * @param fwd Is this forward?
- */
-static void
-connection_reset_timeout (struct CadetConnection *c, int fwd);
-
-
-/**
- * Get string description for tunnel state. Reentrant.
- *
- * @param s Tunnel state.
- *
- * @return String representation.
- */
-static const char *
-GCC_state2s (enum CadetConnectionState s)
-{
- switch (s)
- {
- case CADET_CONNECTION_NEW:
- return "CADET_CONNECTION_NEW";
- case CADET_CONNECTION_SENT:
- return "CADET_CONNECTION_SENT";
- case CADET_CONNECTION_ACK:
- return "CADET_CONNECTION_ACK";
- case CADET_CONNECTION_READY:
- return "CADET_CONNECTION_READY";
- case CADET_CONNECTION_DESTROYED:
- return "CADET_CONNECTION_DESTROYED";
- case CADET_CONNECTION_BROKEN:
- return "CADET_CONNECTION_BROKEN";
- default:
- GNUNET_break (0);
- LOG (GNUNET_ERROR_TYPE_ERROR, " conn state %u unknown!\n", s);
- return "CADET_CONNECTION_STATE_ERROR";
- }
-}
-
-
-/**
- * Initialize a Flow Control structure to the initial state.
- *
- * @param fc Flow Control structure to initialize.
- */
-static void
-fc_init (struct CadetFlowControl *fc)
-{
- fc->next_pid = (uint32_t) 0;
- fc->last_pid_sent = (uint32_t) -1;
- fc->last_pid_recv = (uint32_t) -1;
- fc->last_ack_sent = (uint32_t) 0;
- fc->last_ack_recv = (uint32_t) 0;
- fc->poll_task = NULL;
- fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
- fc->queue_n = 0;
- fc->queue_max = (max_msgs_queue / max_connections) + 1;
-}
-
-
-/**
- * Find a connection.
- *
- * @param cid Connection ID.
- *
- * @return conntection with the given ID @cid or NULL if not found.
- */
-static struct CadetConnection *
-connection_get (const struct GNUNET_CADET_Hash *cid)
-{
- return GNUNET_CONTAINER_multihashmap_get (connections, GC_h2hc (cid));
-}
-
-
-/**
- * Change the connection state. Cannot change a connection marked as destroyed.
- *
- * @param c Connection to change.
- * @param state New state to set.
- */
-static void
-connection_change_state (struct CadetConnection* c,
- enum CadetConnectionState state)
-{
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Connection %s state %s -> %s\n",
- GCC_2s (c), GCC_state2s (c->state), GCC_state2s (state));
- if (CADET_CONNECTION_DESTROYED <= c->state) /* Destroyed or broken. */
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, "state not changing anymore\n");
- return;
- }
- c->state = state;
- if (CADET_CONNECTION_READY == state)
- c->create_retry = 1;
-}
-
-
-/**
- * Mark a connection as "destroyed", to send all pending traffic and freeing
- * all associated resources, without accepting new status changes on it.
- *
- * @param c Connection to mark as destroyed.
- */
-static void
-mark_destroyed (struct CadetConnection *c)
-{
- c->destroy = GNUNET_YES;
- connection_change_state (c, CADET_CONNECTION_DESTROYED);
-}
-
-
-/**
- * Callback called when a queued ACK message is sent.
- *
- * @param cls Closure (FC).
- * @param c Connection this message was on.
- * @param q Queue handler this call invalidates.
- * @param type Type of message sent.
- * @param fwd Was this a FWD going message?
- * @param size Size of the message.
- */
-static void
-ack_sent (void *cls,
- struct CadetConnection *c,
- struct CadetConnectionQueue *q,
- uint16_t type, int fwd, size_t size)
-{
- struct CadetFlowControl *fc = cls;
-
- fc->ack_msg = NULL;
-}
-
-
-/**
- * Send an ACK on the connection, informing the predecessor about
- * the available buffer space. Should not be called in case the peer
- * is origin (no predecessor) in the @c fwd direction.
- *
- * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
- * the ACK itself goes "back" (dest->root).
- *
- * @param c Connection on which to send the ACK.
- * @param buffer How much space free to advertise?
- * @param fwd Is this FWD ACK? (Going dest -> root)
- * @param force Don't optimize out.
- */
-static void
-send_ack (struct CadetConnection *c, unsigned int buffer, int fwd, int force)
-{
- struct CadetFlowControl *next_fc;
- struct CadetFlowControl *prev_fc;
- struct GNUNET_CADET_ACK msg;
- uint32_t ack;
- int delta;
-
- /* If origin, there is no connection to send ACKs. Wrong function! */
- GCC_check_connections ();
- if (GCC_is_origin (c, fwd))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, "connection %s is origin in %s\n",
- GCC_2s (c), GC_f2s (fwd));
- GNUNET_break (0);
- return;
- }
-
- next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
- prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, "connection send %s ack on %s\n",
- GC_f2s (fwd), GCC_2s (c));
-
- /* Check if we need to transmit the ACK. */
- delta = prev_fc->last_ack_sent - prev_fc->last_pid_recv;
- if (3 < delta && buffer < delta && GNUNET_NO == force)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- " last pid recv: %u, last ack sent: %u\n",
- prev_fc->last_pid_recv, prev_fc->last_ack_sent);
- GCC_check_connections ();
- return;
- }
-
- /* Ok, ACK might be necessary, what PID to ACK? */
- ack = prev_fc->last_pid_recv + buffer;
- LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- " last pid %u, last ack %u, qmax %u, q %u\n",
- prev_fc->last_pid_recv, prev_fc->last_ack_sent,
- next_fc->queue_max, next_fc->queue_n);
- if (ack == prev_fc->last_ack_sent && GNUNET_NO == force)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
- GCC_check_connections ();
- return;
- }
-
- /* Check if message is already in queue */
- if (NULL != prev_fc->ack_msg)
- {
- if (GC_is_pid_bigger (ack, prev_fc->last_ack_sent))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " canceling old ACK\n");
- GCC_cancel (prev_fc->ack_msg);
- /* GCC_cancel triggers ack_sent(), which clears fc->ack_msg */
- }
- else
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " same ACK already in queue\n");
- GCC_check_connections ();
- return;
- }
- }
-
- prev_fc->last_ack_sent = ack;
-
- /* Build ACK message and send on conn */
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_ACK);
- msg.ack = htonl (ack);
- msg.cid = c->id;
-
- prev_fc->ack_msg = GCC_send_prebuilt_message (&msg.header, UINT16_MAX, ack,
- c, !fwd, GNUNET_YES,
- &ack_sent, prev_fc);
- GNUNET_assert (NULL != prev_fc->ack_msg);
- GCC_check_connections ();
-}
-
-
-/**
- * Update performance information if we are a connection's endpoint.
- *
- * @param c Connection to update.
- * @param wait How much time did we wait to send the last message.
- * @param size Size of the last message.
- */
-static void
-update_perf (struct CadetConnection *c,
- struct GNUNET_TIME_Relative wait,
- uint16_t size)
-{
- struct CadetConnectionPerformance *p;
- double usecsperbyte;
-
- if (NULL == c->perf)
- return; /* Only endpoints are interested in timing. */
-
- p = c->perf;
- usecsperbyte = ((double) wait.rel_value_us) / size;
- if (p->size == AVG_MSGS)
- {
- /* Array is full. Substract oldest value, add new one and store. */
- p->avg -= (p->usecsperbyte[p->idx] / AVG_MSGS);
- p->usecsperbyte[p->idx] = usecsperbyte;
- p->avg += (p->usecsperbyte[p->idx] / AVG_MSGS);
- }
- else
- {
- /* Array not yet full. Add current value to avg and store. */
- p->usecsperbyte[p->idx] = usecsperbyte;
- p->avg *= p->size;
- p->avg += p->usecsperbyte[p->idx];
- p->size++;
- p->avg /= p->size;
- }
- p->idx = (p->idx + 1) % AVG_MSGS;
-}
-
-
-/**
- * Callback called when a connection queued message is sent.
- *
- * Calculates the average time and connection packet tracking.
- *
- * @param cls Closure (ConnectionQueue Handle), can be NULL.
- * @param c Connection this message was on.
- * @param fwd Was this a FWD going message?
- * @param sent Was it really sent? (Could have been canceled)
- * @param type Type of message sent.
- * @param payload_type Type of payload, if applicable.
- * @param pid Message ID, or 0 if not applicable (create, destroy, etc).
- * @param size Size of the message.
- * @param wait Time spent waiting for core (only the time for THIS message)
- */
-static void
-conn_message_sent (void *cls,
- struct CadetConnection *c, int fwd, int sent,
- uint16_t type, uint16_t payload_type, uint32_t pid,
- size_t size,
- struct GNUNET_TIME_Relative wait)
-{
- struct CadetConnectionQueue *q = cls;
- struct CadetFlowControl *fc;
- int forced;
-
- GCC_check_connections ();
- LOG (GNUNET_ERROR_TYPE_DEBUG, "connection message_sent\n");
-
- /* If c is NULL, nothing to update. */
- if (NULL == c)
- {
- if (type != GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN
- && type != GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY)
- {
- LOG (GNUNET_ERROR_TYPE_ERROR, "Message %s sent on NULL connection!\n",
- GC_m2s (type));
- }
- GCC_check_connections ();
- return;
- }
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, " %ssent %s %s pid %u\n",
- sent ? "" : "not ", GC_f2s (fwd),
- GC_m2s (type), GC_m2s (payload_type), pid);
- GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
-
- /* Update flow control info. */
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
-
- if (NULL != q)
- {
- GNUNET_CONTAINER_DLL_remove (fc->q_head, fc->q_tail, q);
- forced = q->forced;
- if (NULL != q->cont)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " calling cont\n");
- q->cont (q->cont_cls, c, q, type, fwd, size);
- }
- GNUNET_free (q);
- }
- else if (type == GNUNET_MESSAGE_TYPE_CADET_AX)
- {
- /* SHOULD NO LONGER HAPPEN FIXME: REMOVE CASE */
- // If NULL == q and ENCRYPTED == type, message must have been ch_mngmnt
- forced = GNUNET_YES;
- GNUNET_assert (0); // FIXME
- }
- else /* CONN_CREATE or CONN_ACK */
- {
- forced = GNUNET_YES;
- }
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P- %p %u\n", c, c->pending_messages);
- c->pending_messages--;
- if ( (GNUNET_YES == c->destroy) &&
- (0 == c->pending_messages) )
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "! destroying connection!\n");
- GCC_destroy (c);
- GCC_check_connections ();
- return;
- }
-
- /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
- switch (type)
- {
- case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
- case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
- c->maintenance_q = NULL;
- /* Don't trigger a keepalive for sent ACKs, only SYN and SYNACKs */
- if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE == type || !fwd)
- schedule_next_keepalive (c, fwd);
- break;
-
- case GNUNET_MESSAGE_TYPE_CADET_AX:
- if (GNUNET_YES == sent)
- {
- GNUNET_assert (NULL != q);
- fc->last_pid_sent = pid;
- if (GC_is_pid_bigger (fc->last_pid_sent + 1, fc->last_ack_recv))
- GCC_start_poll (c, fwd);
- GCC_send_ack (c, fwd, GNUNET_NO);
- connection_reset_timeout (c, fwd);
- }
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, "! Q_N- %p %u\n", fc, fc->queue_n);
- if (GNUNET_NO == forced)
- {
- fc->queue_n--;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "! accounting pid %u\n",
- fc->last_pid_sent);
- }
- else
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "! forced, Q_N not accounting pid %u\n",
- fc->last_pid_sent);
- }
- break;
-
- case GNUNET_MESSAGE_TYPE_CADET_KX:
- if (GNUNET_YES == sent)
- connection_reset_timeout (c, fwd);
- break;
-
- case GNUNET_MESSAGE_TYPE_CADET_POLL:
- fc->poll_msg = NULL;
- break;
-
- case GNUNET_MESSAGE_TYPE_CADET_ACK:
- fc->ack_msg = NULL;
- break;
-
- case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
- case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
- break;
-
- default:
- LOG (GNUNET_ERROR_TYPE_ERROR, "%s unknown\n", GC_m2s (type));
- GNUNET_break (0);
- break;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG, "! message sent!\n");
-
- update_perf (c, wait, size);
- GCC_check_connections ();
-}
-
-
-/**
- * Get the previous hop in a connection
- *
- * @param c Connection.
- *
- * @return Previous peer in the connection.
- */
-static struct CadetPeer *
-get_prev_hop (const struct CadetConnection *c)
-{
- GNUNET_PEER_Id id;
-
- if (NULL == c->path)
- return NULL;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- " get prev hop %s [%u/%u]\n",
- GCC_2s (c), c->own_pos, c->path->length);
- if (0 == c->own_pos || c->path->length < 2)
- id = c->path->peers[0];
- else
- id = c->path->peers[c->own_pos - 1];
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, " ID: %s (%u)\n",
- GNUNET_i2s (GNUNET_PEER_resolve2 (id)), id);
-
- return GCP_get_short (id, GNUNET_YES);
-}
-
-
-/**
- * Get the next hop in a connection
- *
- * @param c Connection.
- *
- * @return Next peer in the connection.
- */
-static struct CadetPeer *
-get_next_hop (const struct CadetConnection *c)
-{
- GNUNET_PEER_Id id;
-
- if (NULL == c->path)
- return NULL;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, " get next hop %s [%u/%u]\n",
- GCC_2s (c), c->own_pos, c->path->length);
- if ((c->path->length - 1) == c->own_pos || c->path->length < 2)
- id = c->path->peers[c->path->length - 1];
- else
- id = c->path->peers[c->own_pos + 1];
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, " ID: %s (%u)\n",
- GNUNET_i2s (GNUNET_PEER_resolve2 (id)), id);
-
- return GCP_get_short (id, GNUNET_YES);
-}
-
-
-/**
- * Check that the direct neighbours (previous and next hop)
- * are properly associated with this connection.
- *
- * @param c connection to check
- */
-static void
-check_neighbours (const struct CadetConnection *c)
-{
- if (NULL == c->path)
- return; /* nothing to check */
- GCP_check_connection (get_next_hop (c), c);
- GCP_check_connection (get_prev_hop (c), c);
-}
-
-
-/**
- * Helper for #GCC_check_connections(). Calls #check_neighbours().
- *
- * @param cls NULL
- * @param key ignored
- * @param value the `struct CadetConnection` to check
- * @return #GNUNET_OK (continue to iterate)
- */
-static int
-check_connection (void *cls,
- const struct GNUNET_HashCode *key,
- void *value)
-{
- struct CadetConnection *c = value;
-
- check_neighbours (c);
- return GNUNET_OK;
-}
-
-
-/**
- * Check invariants for all connections using #check_neighbours().
- */
-void
-GCC_check_connections ()
-{
- if (0 == CHECK_INVARIANTS)
- return;
- if (NULL == connections)
- return;
- GNUNET_CONTAINER_multihashmap_iterate (connections,
- &check_connection,
- NULL);
-}
-
-
-/**
- * Get the hop in a connection.
- *
- * @param c Connection.
- * @param fwd Next in the FWD direction?
- *
- * @return Next peer in the connection.
- */
-static struct CadetPeer *
-get_hop (struct CadetConnection *c, int fwd)
-{
- return (fwd) ? get_next_hop (c) : get_prev_hop (c);
-}
-
-
-/**
- * Get a bit mask for a message received out-of-order.
- *
- * @param last_pid_recv Last PID we received prior to the out-of-order.
- * @param ooo_pid PID of the out-of-order message.
- */
-static uint32_t
-get_recv_bitmask (uint32_t last_pid_recv, uint32_t ooo_pid)
-{
- return 1 << (last_pid_recv - ooo_pid);
-}
-
-
-/**
- * Check is an out-of-order message is ok:
- * - at most 31 messages behind.
- * - not duplicate.
- *
- * @param last_pid_recv Last in-order PID received.
- */
-static int
-is_ooo_ok (uint32_t last_pid_recv, uint32_t ooo_pid, uint32_t ooo_bitmap)
-{
- uint32_t mask;
-
- if (GC_is_pid_bigger (last_pid_recv - 31, ooo_pid))
- return GNUNET_NO;
-
- mask = get_recv_bitmask (last_pid_recv, ooo_pid);
- if (0 != (ooo_bitmap & mask))
- return GNUNET_NO;
-
- return GNUNET_YES;
-}
-
-
-/**
- * Is traffic coming from this sender 'FWD' traffic?
- *
- * @param c Connection to check.
- * @param sender Short peer identity of neighbor.
- *
- * @return #GNUNET_YES in case the sender is the 'prev' hop and therefore
- * the traffic is 'FWD'.
- * #GNUNET_NO for BCK.
- * #GNUNET_SYSERR for errors (sender isn't a hop in the connection).
- */
-static int
-is_fwd (const struct CadetConnection *c,
- const struct CadetPeer *sender)
-{
- GNUNET_PEER_Id id;
-
- id = GCP_get_short_id (sender);
- if (GCP_get_short_id (get_prev_hop (c)) == id)
- return GNUNET_YES;
-
- if (GCP_get_short_id (get_next_hop (c)) == id)
- return GNUNET_NO;
-
- return GNUNET_SYSERR;
-}
-
-
-/**
- * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
- * or a first CONNECTION_ACK directed to us.
- *
- * @param c Connection to confirm.
- * @param fwd Should we send it FWD? (root->dest)
- * (First (~SYNACK) goes BCK, second (~ACK) goes FWD)
- */
-static void
-send_connection_ack (struct CadetConnection *c, int fwd)
-{
- struct GNUNET_CADET_ConnectionACK msg;
- struct CadetTunnel *t;
- const uint16_t size = sizeof (struct GNUNET_CADET_ConnectionACK);
- const uint16_t type = GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK;
-
- GCC_check_connections ();
- t = c->t;
- LOG (GNUNET_ERROR_TYPE_INFO,
- "==> %s ({ C %s ACK} 0) on conn %s (%p) %s [%5u]\n",
- GC_m2s (type), GC_f2s (!fwd), GCC_2s (c), c, GC_f2s (fwd), size);
-
- msg.header.size = htons (size);
- msg.header.type = htons (type);
- msg.reserved = htonl (0);
- msg.cid = c->id;
-
- GNUNET_assert (NULL == c->maintenance_q);
- c->maintenance_q = GCP_send (get_hop (c, fwd), &msg.header,
- GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK, 0,
- c, fwd,
- &conn_message_sent, NULL);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %p %u (conn`ACK)\n",
- c, c->pending_messages);
- c->pending_messages++;
-
- if (CADET_TUNNEL_NEW == GCT_get_cstate (t))
- GCT_change_cstate (t, CADET_TUNNEL_WAITING);
- if (CADET_CONNECTION_READY != c->state)
- connection_change_state (c, CADET_CONNECTION_SENT);
- GCC_check_connections ();
-}
-
-
-/**
- * Send a notification that a connection is broken.
- *
- * @param c Connection that is broken.
- * @param id1 Peer that has disconnected.
- * @param id2 Peer that has disconnected.
- * @param fwd Direction towards which to send it.
- */
-static void
-send_broken (struct CadetConnection *c,
- const struct GNUNET_PeerIdentity *id1,
- const struct GNUNET_PeerIdentity *id2,
- int fwd)
-{
- struct GNUNET_CADET_ConnectionBroken msg;
-
- GCC_check_connections ();
- msg.header.size = htons (sizeof (struct GNUNET_CADET_ConnectionBroken));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN);
- msg.cid = c->id;
- msg.reserved = htonl (0);
- msg.peer1 = *id1;
- msg.peer2 = *id2;
- GNUNET_assert (NULL ==
- GCC_send_prebuilt_message (&msg.header, UINT16_MAX, 0, c, fwd,
- GNUNET_YES, NULL, NULL));
- GCC_check_connections ();
-}
-
-
-/**
- * Send a notification that a connection is broken, when a connection
- * isn't even known to the local peer or soon to be destroyed.
- *
- * @param connection_id Connection ID.
- * @param id1 Peer that has disconnected, probably local peer.
- * @param id2 Peer that has disconnected can be NULL if unknown.
- * @param neighbor Peer to notify (neighbor who sent the connection).
- */
-static void
-send_broken_unknown (const struct GNUNET_CADET_Hash *connection_id,
- const struct GNUNET_PeerIdentity *id1,
- const struct GNUNET_PeerIdentity *id2,
- struct CadetPeer *neighbor)
-{
- struct GNUNET_CADET_ConnectionBroken msg;
-
- GCC_check_connections ();
- LOG (GNUNET_ERROR_TYPE_INFO, "--> BROKEN on unknown connection %s\n",
- GNUNET_h2s (GC_h2hc (connection_id)));
-
- msg.header.size = htons (sizeof (struct GNUNET_CADET_ConnectionBroken));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN);
- msg.cid = *connection_id;
- msg.reserved = htonl (0);
- msg.peer1 = *id1;
- if (NULL != id2)
- msg.peer2 = *id2;
- else
- memset (&msg.peer2, 0, sizeof (msg.peer2));
- GNUNET_assert (NULL != GCP_send (neighbor, &msg.header,
- UINT16_MAX, 2,
- NULL, GNUNET_SYSERR, /* connection, fwd */
- NULL, NULL)); /* continuation */
- GCC_check_connections ();
-}
-
-
-/**
- * Send keepalive packets for a connection.
- *
- * @param c Connection to keep alive..
- * @param fwd Is this a FWD keepalive? (owner -> dest).
- */
-static void
-send_connection_keepalive (struct CadetConnection *c, int fwd)
-{
- struct GNUNET_MessageHeader msg;
- struct CadetFlowControl *fc;
- int tunnel_ready;
-
- GCC_check_connections ();
- LOG (GNUNET_ERROR_TYPE_INFO,
- "keepalive %s for connection %s\n",
- GC_f2s (fwd), GCC_2s (c));
-
- GNUNET_assert (NULL != c->t);
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
- tunnel_ready = GNUNET_YES == GCT_has_queued_traffic (c->t)
- && CADET_TUNNEL_KEY_OK <= GCT_get_estate (c->t);
- if (0 < fc->queue_n || tunnel_ready)
- {
- LOG (GNUNET_ERROR_TYPE_INFO, "not sending keepalive, traffic in queue\n");
- return;
- }
-
- GNUNET_STATISTICS_update (stats, "# keepalives sent", 1, GNUNET_NO);
-
- GNUNET_assert (NULL != c->t);
- msg.size = htons (sizeof (msg));
- msg.type = htons (GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE);
-
- GNUNET_assert (NULL ==
- GCT_send_prebuilt_message (&msg, c->t, c,
- GNUNET_NO, NULL, NULL));
- GCC_check_connections ();
-}
-
-
-/**
- * Send CONNECTION_{CREATE/ACK} packets for a connection.
- *
- * @param c Connection for which to send the message.
- * @param fwd If #GNUNET_YES, send CREATE, otherwise send ACK.
- */
-static void
-connection_recreate (struct CadetConnection *c, int fwd)
-{
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "sending connection recreate\n");
- if (fwd)
- GCC_send_create (c);
- else
- send_connection_ack (c, GNUNET_NO);
-}
-
-
-/**
- * Generic connection timer management.
- * Depending on the role of the peer in the connection will send the
- * appropriate message (build or keepalive)
- *
- * @param c Conncetion to maintain.
- * @param fwd Is FWD?
- */
-static void
-connection_maintain (struct CadetConnection *c, int fwd)
-{
- if (GNUNET_NO != c->destroy)
- {
- LOG (GNUNET_ERROR_TYPE_INFO, "not sending keepalive, being destroyed\n");
- return;
- }
-
- if (NULL == c->t)
- {
- GNUNET_break (0);
- GCC_debug (c, GNUNET_ERROR_TYPE_ERROR);
- return;
- }
-
- if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (c->t))
- {
- /* If status is SEARCHING, why is there a connection? Should be WAITING */
- GNUNET_break (0);
- GCT_debug (c->t, GNUNET_ERROR_TYPE_ERROR);
- LOG (GNUNET_ERROR_TYPE_INFO, "not sending keepalive, tunnel SEARCHING\n");
- schedule_next_keepalive (c, fwd);
- return;
- }
- switch (c->state)
- {
- case CADET_CONNECTION_NEW:
- GNUNET_break (0);
- /* fall-through */
- case CADET_CONNECTION_SENT:
- connection_recreate (c, fwd);
- break;
- case CADET_CONNECTION_READY:
- send_connection_keepalive (c, fwd);
- break;
- default:
- break;
- }
-}
-
-
-/**
- * Keep the connection alive.
- *
- * @param c Connection to keep alive.
- * @param fwd Direction.
- */
-static void
-connection_keepalive (struct CadetConnection *c,
- int fwd)
-{
- GCC_check_connections ();
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "%s keepalive for %s\n",
- GC_f2s (fwd), GCC_2s (c));
-
- if (fwd)
- c->fwd_maintenance_task = NULL;
- else
- c->bck_maintenance_task = NULL;
- connection_maintain (c, fwd);
- GCC_check_connections ();
- /* Next execution will be scheduled by message_sent or _maintain*/
-}
-
-
-/**
- * Keep the connection alive in the FWD direction.
- *
- * @param cls Closure (connection to keepalive).
- */
-static void
-connection_fwd_keepalive (void *cls)
-{
- struct CadetConnection *c = cls;
-
- GCC_check_connections ();
- connection_keepalive (c,
- GNUNET_YES);
- GCC_check_connections ();
-}
-
-
-/**
- * Keep the connection alive in the BCK direction.
- *
- * @param cls Closure (connection to keepalive).
- */
-static void
-connection_bck_keepalive (void *cls)
-{
- struct CadetConnection *c = cls;
-
- GCC_check_connections ();
- connection_keepalive (c,
- GNUNET_NO);
- GCC_check_connections ();
-}
-
-
-/**
- * Schedule next keepalive task, taking in consideration
- * the connection state and number of retries.
- *
- * If the peer is not the origin, do nothing.
- *
- * @param c Connection for which to schedule the next keepalive.
- * @param fwd Direction for the next keepalive.
- */
-static void
-schedule_next_keepalive (struct CadetConnection *c, int fwd)
-{
- struct GNUNET_TIME_Relative delay;
- struct GNUNET_SCHEDULER_Task * *task_id;
- GNUNET_SCHEDULER_TaskCallback keepalive_task;
-
- GCC_check_connections ();
- if (GNUNET_NO == GCC_is_origin (c, fwd))
- return;
-
- /* Calculate delay to use, depending on the state of the connection */
- if (CADET_CONNECTION_READY == c->state)
- {
- delay = refresh_connection_time;
- }
- else
- {
- if (1 > c->create_retry)
- c->create_retry = 1;
- delay = GNUNET_TIME_relative_multiply (create_connection_time,
- c->create_retry);
- if (c->create_retry < 64) // TODO make configurable
- c->create_retry *= 2;
- }
-
- /* Select direction-dependent parameters */
- if (GNUNET_YES == fwd)
- {
- task_id = &c->fwd_maintenance_task;
- keepalive_task = &connection_fwd_keepalive;
- }
- else
- {
- task_id = &c->bck_maintenance_task;
- keepalive_task = &connection_bck_keepalive;
- }
-
- /* Check that no one scheduled it before us */
- if (NULL != *task_id)
- {
- /* No need for a _break. It can happen for instance when sending a SYNACK
- * for a duplicate SYN: the first SYNACK scheduled the task. */
- GNUNET_SCHEDULER_cancel (*task_id);
- }
-
- /* Schedule the task */
- *task_id = GNUNET_SCHEDULER_add_delayed (delay,
- keepalive_task,
- c);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "next keepalive in %s\n",
- GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
- GCC_check_connections ();
-}
-
-
-/**
- * Cancel all transmissions that belong to a certain connection.
- *
- * If the connection is scheduled for destruction and no more messages are left,
- * the connection will be destroyed by the continuation call.
- *
- * @param c Connection which to cancel. Might be destroyed during this call.
- * @param fwd Cancel fwd traffic?
- */
-static void
-connection_cancel_queues (struct CadetConnection *c,
- int fwd)
-{
- struct CadetFlowControl *fc;
-
- GCC_check_connections ();
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Cancel %s queues for connection %s\n",
- GC_f2s (fwd), GCC_2s (c));
- if (NULL == c)
- {
- GNUNET_break (0);
- return;
- }
-
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
- if (NULL != fc->poll_task)
- {
- GNUNET_SCHEDULER_cancel (fc->poll_task);
- fc->poll_task = NULL;
- LOG (GNUNET_ERROR_TYPE_DEBUG, " cancelled POLL task for fc %p\n", fc);
- }
- if (NULL != fc->poll_msg)
- {
- GCC_cancel (fc->poll_msg);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " cancelled POLL msg for fc %p\n", fc);
- }
-
- while (NULL != fc->q_head)
- {
- GCC_cancel (fc->q_head);
- }
- GCC_check_connections ();
-}
-
-
-/**
- * Function called if a connection has been stalled for a while,
- * possibly due to a missed ACK. Poll the neighbor about its ACK status.
- *
- * @param cls Closure (poll ctx).
- */
-static void
-send_connection_poll (void *cls);
-
-
-/**
- * Callback called when a queued POLL message is sent.
- *
- * @param cls Closure (flow control context).
- * @param c Connection this message was on.
- * @param q Queue handler this call invalidates.
- * @param type Type of message sent.
- * @param fwd Was this a FWD going message?
- * @param size Size of the message.
- */
-static void
-poll_sent (void *cls,
- struct CadetConnection *c,
- struct CadetConnectionQueue *q,
- uint16_t type, int fwd, size_t size)
-{
- struct CadetFlowControl *fc = cls;
-
- GNUNET_assert (fc->poll_msg == q);
- fc->poll_msg = NULL;
- if (2 == c->destroy)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL canceled on shutdown\n");
- return;
- }
- if (0 == fc->queue_max)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL cancelled: neighbor disconnected\n");
- return;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL sent for %s, scheduling new one!\n",
- GCC_2s (c));
- GNUNET_assert (NULL == fc->poll_task);
- fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
- fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
- &send_connection_poll,
- fc);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " task %u\n", fc->poll_task);
-}
-
-
-/**
- * Function called if a connection has been stalled for a while,
- * possibly due to a missed ACK. Poll the neighbor about its ACK status.
- *
- * @param cls Closure (poll ctx).
- */
-static void
-send_connection_poll (void *cls)
-{
- struct CadetFlowControl *fc = cls;
- struct GNUNET_CADET_Poll msg;
- struct CadetConnection *c;
- int fwd;
-
- fc->poll_task = NULL;
- GCC_check_connections ();
- c = fc->c;
- fwd = fc == &c->fwd_fc;
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Polling connection %s %s\n",
- GCC_2s (c), GC_f2s (fwd));
-
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_POLL);
- msg.header.size = htons (sizeof (msg));
- msg.cid = c->id;
- msg.pid = htonl (fc->last_pid_sent);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " last pid sent: %u\n", fc->last_pid_sent);
- fc->poll_msg =
- GCC_send_prebuilt_message (&msg.header, UINT16_MAX, fc->last_pid_sent, c,
- fc == &c->fwd_fc, GNUNET_YES, &poll_sent, fc);
- GNUNET_assert (NULL != fc->poll_msg);
- GCC_check_connections ();
-}
-
-
-/**
- * Generic connection timeout implementation.
- *
- * Timeout function due to lack of keepalive/traffic from an endpoint.
- * Destroys connection if called.
- *
- * @param c Connection to destroy.
- * @param fwd Was the timeout from the origin? (FWD timeout)
- */
-static void
-connection_timeout (struct CadetConnection *c, int fwd)
-{
- GCC_check_connections ();
-
- LOG (GNUNET_ERROR_TYPE_INFO,
- "Connection %s %s timed out. Destroying.\n",
- GCC_2s (c),
- GC_f2s (fwd));
- GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
-
- if (GCC_is_origin (c, fwd)) /* Loopback? Something is wrong! */
- {
- GNUNET_break (0);
- return;
- }
-
- /* If dest, send "broken" notification. */
- if (GCC_is_terminal (c, fwd))
- {
- struct CadetPeer *next_hop;
-
- next_hop = fwd ? get_prev_hop (c) : get_next_hop (c);
- send_broken_unknown (&c->id, &my_full_id, NULL, next_hop);
- }
-
- GCC_destroy (c);
- GCC_check_connections ();
-}
-
-
-/**
- * Timeout function due to lack of keepalive/traffic from the owner.
- * Destroys connection if called.
- *
- * @param cls Closure (connection to destroy).
- */
-static void
-connection_fwd_timeout (void *cls)
-{
- struct CadetConnection *c = cls;
-
- c->fwd_maintenance_task = NULL;
- GCC_check_connections ();
- connection_timeout (c, GNUNET_YES);
- GCC_check_connections ();
-}
-
-
-/**
- * Timeout function due to lack of keepalive/traffic from the destination.
- * Destroys connection if called.
- *
- * @param cls Closure (connection to destroy).
- */
-static void
-connection_bck_timeout (void *cls)
-{
- struct CadetConnection *c = cls;
-
- c->bck_maintenance_task = NULL;
- GCC_check_connections ();
- connection_timeout (c, GNUNET_NO);
- GCC_check_connections ();
-}
-
-
-/**
- * Resets the connection timeout task, some other message has done the
- * task's job.
- * - For the first peer on the direction this means to send
- * a keepalive or a path confirmation message (either create or ACK).
- * - For all other peers, this means to destroy the connection,
- * due to lack of activity.
- * Starts the timeout if no timeout was running (connection just created).
- *
- * @param c Connection whose timeout to reset.
- * @param fwd Is this forward?
- *
- * TODO use heap to improve efficiency of scheduler.
- */
-static void
-connection_reset_timeout (struct CadetConnection *c, int fwd)
-{
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s reset timeout\n", GC_f2s (fwd));
- if (GCC_is_origin (c, fwd)) /* Startpoint */
- {
- schedule_next_keepalive (c, fwd);
- if (NULL != c->maintenance_q)
- {
- GCP_send_cancel (c->maintenance_q);
- c->maintenance_q = NULL; /* Is set to NULL by conn_message_sent anyway */
- }
- }
- else /* Relay, endpoint. */
- {
- struct GNUNET_TIME_Relative delay;
- struct GNUNET_SCHEDULER_Task * *ti;
- GNUNET_SCHEDULER_TaskCallback f;
-
- ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
-
- if (NULL != *ti)
- GNUNET_SCHEDULER_cancel (*ti);
- delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- " timing out in %s\n",
- GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_NO));
- f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
- *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
- }
-}
-
-
-/**
- * Iterator to compare each connection's path with the path of a new connection.
- *
- * If the connection coincides, the c member of path is set to the connection
- * and the destroy flag of the connection is set.
- *
- * @param cls Closure (new path).
- * @param c Connection in the tunnel to check.
- */
-static void
-check_path (void *cls, struct CadetConnection *c)
-{
- struct CadetConnection *new_conn = cls;
- struct CadetPeerPath *path = new_conn->path;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, " checking %s (%p), length %u\n",
- GCC_2s (c), c, c->path->length);
-
- if (c != new_conn
- && GNUNET_NO == c->destroy
- && CADET_CONNECTION_BROKEN != c->state
- && CADET_CONNECTION_DESTROYED != c->state
- && path_equivalent (path, c->path))
- {
- new_conn->destroy = GNUNET_YES; /* Do not mark_destroyed, */
- new_conn->path->c = c; /* this is only a flag for the Iterator. */
- LOG (GNUNET_ERROR_TYPE_DEBUG, " MATCH!\n");
- }
-}
-
-
-/**
- * Finds out if this path is already being used by an existing connection.
- *
- * Checks the tunnel towards the destination to see if it contains
- * any connection with the same path.
- *
- * If the existing connection is ready, it is kept.
- * Otherwise if the sender has a smaller ID that ours, we accept it (and
- * the peer will eventually reject our attempt).
- *
- * @param path Path to check.
- * @return #GNUNET_YES if the tunnel has a connection with the same path,
- * #GNUNET_NO otherwise.
- */
-static int
-does_connection_exist (struct CadetConnection *conn)
-{
- struct CadetPeer *p;
- struct CadetTunnel *t;
- struct CadetConnection *c;
-
- p = GCP_get_short (conn->path->peers[0], GNUNET_NO);
- if (NULL == p)
- return GNUNET_NO;
- t = GCP_get_tunnel (p);
- if (NULL == t)
- return GNUNET_NO;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking for duplicates\n");
-
- GCT_iterate_connections (t, &check_path, conn);
-
- if (GNUNET_YES == conn->destroy)
- {
- c = conn->path->c;
- conn->destroy = GNUNET_NO;
- conn->path->c = conn;
- LOG (GNUNET_ERROR_TYPE_DEBUG, " found duplicate of %s\n", GCC_2s (conn));
- LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate: %s\n", GCC_2s (c));
- GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
- if (CADET_CONNECTION_READY == c->state)
- {
- /* The other peer confirmed a live connection with this path,
- * why are they trying to duplicate it? */
- GNUNET_STATISTICS_update (stats, "# duplicate connections", 1, GNUNET_NO);
- return GNUNET_YES;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate not ready, connection unique\n");
- return GNUNET_NO;
- }
- else
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " %s has no duplicates\n", GCC_2s (conn));
- return GNUNET_NO;
- }
-}
-
-
-/**
- * @brief Check if the tunnel this connection belongs to has any other
- * connection with the same path, and destroy one if so.
- *
- * @param cls Closure (connection to check).
- */
-static void
-check_duplicates (void *cls)
-{
- struct CadetConnection *c = cls;
-
- c->check_duplicates_task = NULL;
- if (GNUNET_YES == does_connection_exist (c))
- {
- GCT_debug (c->t, GNUNET_ERROR_TYPE_DEBUG);
- send_broken (c, &my_full_id, &my_full_id, GCC_is_origin (c, GNUNET_YES));
- GCC_destroy (c);
- }
-}
-
-
-/**
- * Wait for enough time to let any dead connections time out and check for
- * any remaining duplicates.
- *
- * @param c Connection that is a potential duplicate.
- */
-static void
-schedule_check_duplicates (struct CadetConnection *c)
-{
- struct GNUNET_TIME_Relative delay;
-
- if (NULL != c->check_duplicates_task)
- return;
- delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 5);
- c->check_duplicates_task = GNUNET_SCHEDULER_add_delayed (delay,
- &check_duplicates,
- c);
-}
-
-
-/**
- * Add the connection to the list of both neighbors.
- *
- * @param c Connection.
- *
- * @return #GNUNET_OK if everything went fine
- * #GNUNET_SYSERR if the was an error and @c c is malformed.
- */
-static int
-register_neighbors (struct CadetConnection *c)
-{
- c->next_peer = get_next_hop (c);
- c->prev_peer = get_prev_hop (c);
- GNUNET_assert (c->next_peer != c->prev_peer);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "register neighbors for connection %s\n",
- GCC_2s (c));
- path_debug (c->path);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "own pos %u\n", c->own_pos);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "putting connection %s to next peer %p\n",
- GCC_2s (c),
- c->next_peer);
- LOG (GNUNET_ERROR_TYPE_DEBUG, "next peer %p %s\n",
- c->next_peer,
- GCP_2s (c->next_peer));
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "putting connection %s to prev peer %p\n",
- GCC_2s (c),
- c->prev_peer);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "prev peer %p %s\n",
- c->prev_peer,
- GCP_2s (c->prev_peer));
-
- if ( (GNUNET_NO == GCP_is_neighbor (c->next_peer)) ||
- (GNUNET_NO == GCP_is_neighbor (c->prev_peer)) )
- {
- if (GCC_is_origin (c, GNUNET_YES))
- GNUNET_STATISTICS_update (stats, "# local bad paths", 1, GNUNET_NO);
- GNUNET_STATISTICS_update (stats, "# bad paths", 1, GNUNET_NO);
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- " register neighbors failed\n");
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- " prev: %s, neighbor?: %d\n",
- GCP_2s (c->prev_peer),
- GCP_is_neighbor (c->prev_peer));
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- " next: %s, neighbor?: %d\n",
- GCP_2s (c->next_peer),
- GCP_is_neighbor (c->next_peer));
- return GNUNET_SYSERR;
- }
- GCP_add_connection (c->next_peer, c, GNUNET_NO);
- GCP_add_connection (c->prev_peer, c, GNUNET_YES);
-
- return GNUNET_OK;
-}
-
-
-/**
- * Remove the connection from the list of both neighbors.
- *
- * @param c Connection.
- */
-static void
-unregister_neighbors (struct CadetConnection *c)
-{
-// struct CadetPeer *peer; FIXME dont use next_peer, prev_peer
- /* Either already unregistered or never got registered, it's ok either way. */
- if (NULL == c->path)
- return;
- if (NULL != c->next_peer)
- {
- GCP_remove_connection (c->next_peer, c);
- c->next_peer = NULL;
- }
- if (NULL != c->prev_peer)
- {
- GCP_remove_connection (c->prev_peer, c);
- c->prev_peer = NULL;
- }
-}
-
-
-/**
- * Invalidates all paths towards all peers that comprise the connection which
- * rely on the disconnected peer.
- *
- * ~O(n^3) (peers in connection * paths/peer * links/path)
- *
- * @param c Connection whose peers' paths to clean.
- * @param disconnected Peer that disconnected.
- */
-static void
-invalidate_paths (struct CadetConnection *c,
- struct CadetPeer *disconnected)
-{
- struct CadetPeer *peer;
- unsigned int i;
-
- for (i = 0; i < c->path->length; i++)
- {
- peer = GCP_get_short (c->path->peers[i], GNUNET_NO);
- if (NULL != peer)
- GCP_notify_broken_link (peer, &my_full_id, GCP_get_id (disconnected));
- }
-}
-
-
-/**
- * Bind the connection to the peer and the tunnel to that peer.
- *
- * If the peer has no tunnel, create one. Update tunnel and connection
- * data structres to reflect new status.
- *
- * @param c Connection.
- * @param peer Peer.
- */
-static void
-add_to_peer (struct CadetConnection *c,
- struct CadetPeer *peer)
-{
- GCP_add_tunnel (peer);
- c->t = GCP_get_tunnel (peer);
- GCT_add_connection (c->t, c);
-}
-
-
-/**
- * Log receipt of message on stderr (INFO level).
- *
- * @param message Message received.
- * @param peer Peer who sent the message.
- * @param conn_id Connection ID of the message.
- */
-static void
-log_message (const struct GNUNET_MessageHeader *message,
- const struct CadetPeer *peer,
- const struct GNUNET_CADET_Hash *conn_id)
-{
- uint16_t size;
- uint16_t type;
- char *arrow;
-
- size = ntohs (message->size);
- type = ntohs (message->type);
- switch (type)
- {
- case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
- case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
- case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
- case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
- arrow = "==";
- break;
- default:
- arrow = "--";
- }
- LOG (GNUNET_ERROR_TYPE_INFO, "<%s %s on conn %s from %s, %6u bytes\n",
- arrow, GC_m2s (type), GNUNET_h2s (GC_h2hc (conn_id)),
- GCP_2s(peer), (unsigned int) size);
-}
-
-/******************************************************************************/
-/******************************** API ***********************************/
-/******************************************************************************/
-
-/**
- * Handler for connection creation.
- *
- * @param peer Message sender (neighbor).
- * @param msg Message itself.
- */
-void
-GCC_handle_create (struct CadetPeer *peer,
- const struct GNUNET_CADET_ConnectionCreate *msg)
-{
- const struct GNUNET_CADET_Hash *cid;
- struct GNUNET_PeerIdentity *id;
- struct CadetPeerPath *path;
- struct CadetPeer *dest_peer;
- struct CadetPeer *orig_peer;
- struct CadetConnection *c;
- unsigned int own_pos;
- uint16_t size;
-
- GCC_check_connections ();
- size = ntohs (msg->header.size);
-
- /* Calculate hops */
- size -= sizeof (struct GNUNET_CADET_ConnectionCreate);
- if (0 != size % sizeof (struct GNUNET_PeerIdentity))
- {
- GNUNET_break_op (0);
- return;
- }
- size /= sizeof (struct GNUNET_PeerIdentity);
- if (1 > size)
- {
- GNUNET_break_op (0);
- return;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
-
- /* Get parameters */
- cid = &msg->cid;
- log_message (&msg->header, peer, cid);
- id = (struct GNUNET_PeerIdentity *) &msg[1];
- LOG (GNUNET_ERROR_TYPE_DEBUG, " origin: %s\n", GNUNET_i2s (id));
-
- /* Create connection */
- c = connection_get (cid);
- if (NULL == c)
- {
- path = path_build_from_peer_ids ((struct GNUNET_PeerIdentity *) &msg[1],
- size, myid, &own_pos);
- if (NULL == path)
- {
- /* Path was malformed, probably our own ID was not in it. */
- GNUNET_STATISTICS_update (stats, "# malformed paths", 1, GNUNET_NO);
- GNUNET_break_op (0);
- return;
- }
- if (0 == own_pos)
- {
- /* We received this request from a neighbor, we cannot be origin */
- GNUNET_STATISTICS_update (stats, "# fake paths", 1, GNUNET_NO);
- GNUNET_break_op (0);
- path_destroy (path);
- return;
- }
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
- c = GCC_new (cid, NULL, path, own_pos);
- if (NULL == c)
- {
- if (path->length - 1 == own_pos)
- {
- /* If we are destination, why did the creation fail? */
- GNUNET_break (0);
- path_destroy (path);
- GCC_check_connections ();
- return;
- }
- send_broken_unknown (cid, &my_full_id,
- GNUNET_PEER_resolve2 (path->peers[own_pos + 1]),
- peer);
- path_destroy (path);
- GCC_check_connections ();
- return;
- }
- GCP_add_path_to_all (path, GNUNET_NO);
- connection_reset_timeout (c, GNUNET_YES);
- }
- else
- {
- path = path_duplicate (c->path);
- }
- if (CADET_CONNECTION_NEW == c->state)
- connection_change_state (c, CADET_CONNECTION_SENT);
-
- /* Remember peers */
- dest_peer = GCP_get (&id[size - 1], GNUNET_YES);
- orig_peer = GCP_get (&id[0], GNUNET_YES);
-
- /* Is it a connection to us? */
- if (c->own_pos == path->length - 1)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
- GCP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_YES);
-
- add_to_peer (c, orig_peer);
- if (GNUNET_YES == does_connection_exist (c))
- {
- /* Peer created a connection equal to one we think exists
- * and is fine.
- * Solution: Keep both and postpone disambiguation. In the meantime
- * the connection will time out or peer will inform us it is broken.
- *
- * Other options:
- * - Use explicit duplicate.
- * - Accept new conn and destroy the old. (interruption in higher level)
- * - Keep the one with higher ID / created by peer with higher ID. */
- schedule_check_duplicates (c);
- }
-
- if (CADET_TUNNEL_NEW == GCT_get_cstate (c->t))
- GCT_change_cstate (c->t, CADET_TUNNEL_WAITING);
- if (NULL == c->maintenance_q)
- send_connection_ack (c, GNUNET_NO);
- if (CADET_CONNECTION_SENT == c->state)
- connection_change_state (c, CADET_CONNECTION_ACK);
- }
- else
- {
- /* It's for somebody else! Retransmit. */
- LOG (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
- GCP_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
- GCP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_NO);
- GNUNET_assert (NULL ==
- GCC_send_prebuilt_message (&msg->header, 0, 0, c,
- GNUNET_YES, GNUNET_YES,
- NULL, NULL));
- }
- path_destroy (path);
- GCC_check_connections ();
-}
-
-
-/**
- * Handler for connection confirmations.
- *
- * @param peer Message sender (neighbor).
- * @param msg Message itself.
- */
-void
-GCC_handle_confirm (struct CadetPeer *peer,
- const struct GNUNET_CADET_ConnectionACK *msg)
-{
- struct CadetConnection *c;
- enum CadetConnectionState oldstate;
- int fwd;
-
- GCC_check_connections ();
- log_message (&msg->header, peer, &msg->cid);
- c = connection_get (&msg->cid);
- if (NULL == c)
- {
- GNUNET_STATISTICS_update (stats, "# control on unknown connection",
- 1, GNUNET_NO);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- " don't know the connection!\n");
- send_broken_unknown (&msg->cid, &my_full_id, NULL, peer);
- GCC_check_connections ();
- return;
- }
- if (GNUNET_NO != c->destroy)
- {
- GNUNET_assert (CADET_CONNECTION_DESTROYED == c->state);
- GNUNET_STATISTICS_update (stats, "# control on dying connection",
- 1, GNUNET_NO);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "connection %s being destroyed, ignoring confirm\n",
- GCC_2s (c));
- GCC_check_connections ();
- return;
- }
-
- oldstate = c->state;
- LOG (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n", GCP_2s (peer));
- if (get_next_hop (c) == peer)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " SYNACK\n");
- fwd = GNUNET_NO;
- if (CADET_CONNECTION_SENT == oldstate)
- connection_change_state (c, CADET_CONNECTION_ACK);
- }
- else if (get_prev_hop (c) == peer)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " FINAL ACK\n");
- fwd = GNUNET_YES;
- connection_change_state (c, CADET_CONNECTION_READY);
- }
- else
- {
- GNUNET_STATISTICS_update (stats, "# control on connection from wrong peer",
- 1, GNUNET_NO);
- GNUNET_break_op (0);
- return;
- }
-
- connection_reset_timeout (c, fwd);
-
- /* Add path to peers? */
- if (NULL != c->path)
- {
- GCP_add_path_to_all (c->path, GNUNET_YES);
- }
- else
- {
- GNUNET_break (0);
- }
-
- /* Message for us as creator? */
- if (GNUNET_YES == GCC_is_origin (c, GNUNET_YES))
- {
- if (GNUNET_NO != fwd)
- {
- GNUNET_break (0);
- return;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection (SYN)ACK for us!\n");
-
- /* If just created, cancel the short timeout and start a long one */
- if (CADET_CONNECTION_SENT == oldstate)
- {
- c->create_retry = 1;
- connection_reset_timeout (c, GNUNET_YES);
- }
-
- /* Change connection state, send ACK */
- connection_change_state (c, CADET_CONNECTION_READY);
- send_connection_ack (c, GNUNET_YES);
-
- /* Change tunnel state, trigger KX */
- if (CADET_TUNNEL_WAITING == GCT_get_cstate (c->t))
- GCT_change_cstate (c->t, CADET_TUNNEL_READY);
- GCC_check_connections ();
- return;
- }
-
- /* Message for us as destination? */
- if (GCC_is_terminal (c, GNUNET_YES))
- {
- if (GNUNET_YES != fwd)
- {
- GNUNET_break (0);
- return;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
-
- /* If just created, cancel the short timeout and start a long one */
- if (CADET_CONNECTION_ACK == oldstate)
- connection_reset_timeout (c, GNUNET_NO);
-
- /* Change tunnel state */
- if (CADET_TUNNEL_WAITING == GCT_get_cstate (c->t))
- GCT_change_cstate (c->t, CADET_TUNNEL_READY);
- GCC_check_connections ();
- return;
- }
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
- GNUNET_assert (NULL ==
- GCC_send_prebuilt_message (&msg->header, 0, 0, c, fwd,
- GNUNET_YES, NULL, NULL));
- GCC_check_connections ();
- return;
-}
-
-
-/**
- * Handler for notifications of broken connections.
- *
- * @param peer Message sender (neighbor).
- * @param msg Message itself.
- */
-void
-GCC_handle_broken (struct CadetPeer *peer,
- const struct GNUNET_CADET_ConnectionBroken *msg)
-{
- struct CadetConnection *c;
- struct CadetTunnel *t;
- int fwd;
-
- GCC_check_connections ();
- log_message (&msg->header, peer, &msg->cid);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n", GNUNET_i2s (&msg->peer1));
- LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n", GNUNET_i2s (&msg->peer2));
- c = connection_get (&msg->cid);
- if (NULL == c)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate CONNECTION_BROKEN\n");
- GNUNET_STATISTICS_update (stats, "# duplicate CONNECTION_BROKEN",
- 1, GNUNET_NO);
- GCC_check_connections ();
- return;
- }
-
- t = c->t;
-
- fwd = is_fwd (c, peer);
- if (GNUNET_SYSERR == fwd)
- {
- GNUNET_break_op (0);
- GCC_check_connections ();
- return;
- }
- mark_destroyed (c);
- if (GCC_is_terminal (c, fwd))
- {
- struct CadetPeer *endpoint;
-
- if (NULL == t)
- {
- /* A terminal connection should not have 't' set to NULL. */
- GNUNET_break (0);
- GCC_debug (c, GNUNET_ERROR_TYPE_ERROR);
- return;
- }
- endpoint = GCP_get_short (c->path->peers[c->path->length - 1], GNUNET_YES);
- if (2 < c->path->length)
- path_invalidate (c->path);
- GCP_notify_broken_link (endpoint, &msg->peer1, &msg->peer2);
-
- connection_change_state (c, CADET_CONNECTION_BROKEN);
- GCT_remove_connection (t, c);
- c->t = NULL;
-
- GCC_destroy (c);
- }
- else
- {
- GNUNET_assert (NULL ==
- GCC_send_prebuilt_message (&msg->header, 0, 0, c, fwd,
- GNUNET_YES, NULL, NULL));
- connection_cancel_queues (c, !fwd);
- }
- GCC_check_connections ();
- return;
-}
-
-
-/**
- * Handler for notifications of destroyed connections.
- *
- * @param peer Message sender (neighbor).
- * @param msg Message itself.
- */
-void
-GCC_handle_destroy (struct CadetPeer *peer,
- const struct GNUNET_CADET_ConnectionDestroy *msg)
-{
- struct CadetConnection *c;
- int fwd;
-
- GCC_check_connections ();
- log_message (&msg->header, peer, &msg->cid);
- c = connection_get (&msg->cid);
- if (NULL == c)
- {
- /* Probably already got the message from another path,
- * destroyed the tunnel and retransmitted to children.
- * Safe to ignore.
- */
- GNUNET_STATISTICS_update (stats,
- "# control on unknown connection",
- 1, GNUNET_NO);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- " connection unknown destroyed: previously destroyed?\n");
- GCC_check_connections ();
- return;
- }
-
- fwd = is_fwd (c, peer);
- if (GNUNET_SYSERR == fwd)
- {
- GNUNET_break_op (0);
- GCC_check_connections ();
- return;
- }
-
- if (GNUNET_NO == GCC_is_terminal (c, fwd))
- {
- GNUNET_assert (NULL ==
- GCC_send_prebuilt_message (&msg->header, 0, 0, c, fwd,
- GNUNET_YES, NULL, NULL));
- }
- else if (0 == c->pending_messages)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " directly destroying connection!\n");
- GCC_destroy (c);
- GCC_check_connections ();
- return;
- }
- mark_destroyed (c);
- if (NULL != c->t)
- {
- GCT_remove_connection (c->t, c);
- c->t = NULL;
- }
- GCC_check_connections ();
- return;
-}
-
-
-/**
- * Handler for cadet network traffic hop-by-hop acks.
- *
- * @param peer Message sender (neighbor).
- * @param msg Message itself.
- */
-void
-GCC_handle_ack (struct CadetPeer *peer,
- const struct GNUNET_CADET_ACK *msg)
-{
- struct CadetConnection *c;
- struct CadetFlowControl *fc;
- uint32_t ack;
- int fwd;
-
- GCC_check_connections ();
- log_message (&msg->header, peer, &msg->cid);
- c = connection_get (&msg->cid);
- if (NULL == c)
- {
- GNUNET_STATISTICS_update (stats,
- "# ack on unknown connection",
- 1,
- GNUNET_NO);
- send_broken_unknown (&msg->cid,
- &my_full_id,
- NULL,
- peer);
- GCC_check_connections ();
- return;
- }
-
- /* Is this a forward or backward ACK? */
- if (get_next_hop (c) == peer)
- {
- fc = &c->fwd_fc;
- fwd = GNUNET_YES;
- }
- else if (get_prev_hop (c) == peer)
- {
- fc = &c->bck_fc;
- fwd = GNUNET_NO;
- }
- else
- {
- GNUNET_break_op (0);
- return;
- }
-
- ack = ntohl (msg->ack);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " %s ACK %u (was %u)\n",
- GC_f2s (fwd), ack, fc->last_ack_recv);
- if (GC_is_pid_bigger (ack, fc->last_ack_recv))
- fc->last_ack_recv = ack;
-
- /* Cancel polling if the ACK is big enough. */
- if (NULL != fc->poll_task &&
- GC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
- GNUNET_SCHEDULER_cancel (fc->poll_task);
- fc->poll_task = NULL;
- fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
- }
-
- GCC_check_connections ();
-}
-
-
-/**
- * Handler for cadet network traffic hop-by-hop data counter polls.
- *
- * @param peer Message sender (neighbor).
- * @param msg Message itself.
- */
-void
-GCC_handle_poll (struct CadetPeer *peer,
- const struct GNUNET_CADET_Poll *msg)
-{
- struct CadetConnection *c;
- struct CadetFlowControl *fc;
- uint32_t pid;
- int fwd;
-
- GCC_check_connections ();
- log_message (&msg->header, peer, &msg->cid);
- c = connection_get (&msg->cid);
- if (NULL == c)
- {
- GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
- GNUNET_NO);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "POLL message on unknown connection %s!\n",
- GNUNET_h2s (GC_h2hc (&msg->cid)));
- send_broken_unknown (&msg->cid,
- &my_full_id,
- NULL,
- peer);
- GCC_check_connections ();
- return;
- }
-
- /* Is this a forward or backward ACK?
- * Note: a poll should never be needed in a loopback case,
- * since there is no possiblility of packet loss there, so
- * this way of discerining FWD/BCK should not be a problem.
- */
- if (get_next_hop (c) == peer)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
- fc = &c->fwd_fc;
- }
- else if (get_prev_hop (c) == peer)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
- fc = &c->bck_fc;
- }
- else
- {
- GNUNET_break_op (0);
- return;
- }
-
- pid = ntohl (msg->pid);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n", pid, fc->last_pid_recv);
- fc->last_pid_recv = pid;
- fwd = fc == &c->bck_fc;
- GCC_send_ack (c, fwd, GNUNET_YES);
- GCC_check_connections ();
-}
-
-
-/**
- * Check the message against internal state and test if it goes FWD or BCK.
- *
- * Updates the PID, state and timeout values for the connection.
- *
- * @param message Message to check. It must belong to an existing connection.
- * @param cid Connection ID (even if @a c is NULL, the ID is still needed).
- * @param c Connection this message should belong. If NULL, check fails.
- * @param sender Neighbor that sent the message.
- *
- * @return #GNUNET_YES if the message goes FWD.
- * #GNUNET_NO if it goes BCK.
- * #GNUNET_SYSERR if there is an error (unauthorized sender, ...).
- */
-static int
-check_message (const struct GNUNET_MessageHeader *message,
- const struct GNUNET_CADET_Hash* cid,
- struct CadetConnection *c,
- struct CadetPeer *sender,
- uint32_t pid)
-{
- struct CadetFlowControl *fc;
- struct CadetPeer *hop;
- int fwd;
- uint16_t type;
-
- /* Check connection */
- if (NULL == c)
- {
- GNUNET_STATISTICS_update (stats,
- "# unknown connection",
- 1, GNUNET_NO);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "%s on unknown connection %s\n",
- GC_m2s (ntohs (message->type)),
- GNUNET_h2s (GC_h2hc (cid)));
- send_broken_unknown (cid,
- &my_full_id,
- NULL,
- sender);
- return GNUNET_SYSERR;
- }
-
- /* Check if origin is as expected */
- hop = get_prev_hop (c);
- if (sender == hop)
- {
- fwd = GNUNET_YES;
- }
- else
- {
- hop = get_next_hop (c);
- GNUNET_break (hop == c->next_peer);
- if (sender == hop)
- {
- fwd = GNUNET_NO;
- }
- else
- {
- /* Unexpected peer sending traffic on a connection. */
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- }
-
- /* Check PID for payload messages */
- type = ntohs (message->type);
- if (GNUNET_MESSAGE_TYPE_CADET_AX == type)
- {
- fc = fwd ? &c->bck_fc : &c->fwd_fc;
- LOG (GNUNET_ERROR_TYPE_DEBUG, " PID %u (expected %u - %u)\n",
- pid, fc->last_pid_recv + 1, fc->last_ack_sent);
- if (GC_is_pid_bigger (pid, fc->last_ack_sent))
- {
- GNUNET_break_op (0);
- GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
- LOG (GNUNET_ERROR_TYPE_WARNING, "Received PID %u, (prev %u), ACK %u\n",
- pid, fc->last_pid_recv, fc->last_ack_sent);
- return GNUNET_SYSERR;
- }
- if (GC_is_pid_bigger (pid, fc->last_pid_recv))
- {
- unsigned int delta;
-
- delta = pid - fc->last_pid_recv;
- fc->last_pid_recv = pid;
- fc->recv_bitmap <<= delta;
- fc->recv_bitmap |= 1;
- }
- else
- {
- GNUNET_STATISTICS_update (stats, "# out of order PID", 1, GNUNET_NO);
- if (GNUNET_NO == is_ooo_ok (fc->last_pid_recv, pid, fc->recv_bitmap))
- {
- LOG (GNUNET_ERROR_TYPE_WARNING, "PID %u unexpected (%u+), dropping!\n",
- pid, fc->last_pid_recv - 31);
- return GNUNET_SYSERR;
- }
- fc->recv_bitmap |= get_recv_bitmask (fc->last_pid_recv, pid);
- }
- }
-
- /* Count as connection confirmation. */
- if (CADET_CONNECTION_SENT == c->state || CADET_CONNECTION_ACK == c->state)
- {
- connection_change_state (c, CADET_CONNECTION_READY);
- if (NULL != c->t)
- {
- if (CADET_TUNNEL_WAITING == GCT_get_cstate (c->t))
- GCT_change_cstate (c->t, CADET_TUNNEL_READY);
- }
- }
- connection_reset_timeout (c, fwd);
+ /**
+ * Are we ready to transmit via @e mq_man right now?
+ */
+ int mqm_ready;
- return fwd;
-}
+};
/**
- * Handler for key exchange traffic (Axolotl KX).
+ * Lookup a connection by its identifier.
*
- * @param peer Message sender (neighbor).
- * @param msg Message itself.
+ * @param cid identifier to resolve
+ * @return NULL if connection was not found
*/
-void
-GCC_handle_kx (struct CadetPeer *peer,
- const struct GNUNET_CADET_KX *msg)
+struct CadetConnection *
+GCC_lookup (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
{
- const struct GNUNET_CADET_Hash* cid;
- struct CadetConnection *c;
- int fwd;
-
- GCC_check_connections ();
- cid = &msg->cid;
- log_message (&msg->header, peer, cid);
-
- c = connection_get (cid);
- fwd = check_message (&msg->header,
- cid,
- c,
- peer,
- 0);
-
- /* If something went wrong, discard message. */
- if (GNUNET_SYSERR == fwd)
- {
- GNUNET_break_op (0);
- GCC_check_connections ();
- return;
- }
-
- /* Is this message for us? */
- if (GCC_is_terminal (c, fwd))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
- GNUNET_STATISTICS_update (stats, "# received KX", 1, GNUNET_NO);
- if (NULL == c->t)
- {
- GNUNET_break (0);
- return;
- }
- GCT_handle_kx (c->t, &msg[1].header);
- GCC_check_connections ();
- return;
- }
-
- /* Message not for us: forward to next hop */
- LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
- GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
- GNUNET_assert (NULL == GCC_send_prebuilt_message (&msg->header, 0, 0, c, fwd,
- GNUNET_NO, NULL, NULL));
- GCC_check_connections ();
+ return GNUNET_CONTAINER_multishortmap_get (connections,
+ &cid->connection_of_tunnel);
}
/**
- * Handler for encrypted cadet network traffic (channel mgmt, data).
+ * Update the connection state. Also triggers the necessary
+ * MQM notifications.
*
- * @param peer Message sender (neighbor).
- * @param msg Message itself.
+ * @param cc connection to update the state for
+ * @param new_state new state for @a cc
+ * @param new_mqm_ready new `mqm_ready` state for @a cc
*/
-void
-GCC_handle_encrypted (struct CadetPeer *peer,
- const struct GNUNET_CADET_AX *msg)
+static void
+update_state (struct CadetConnection *cc,
+ enum CadetConnectionState new_state,
+ int new_mqm_ready)
{
- const struct GNUNET_CADET_Hash* cid;
- struct CadetConnection *c;
- uint32_t pid;
- int fwd;
-
- GCC_check_connections ();
- cid = &msg->cid;
- pid = ntohl (msg->pid);
- log_message (&msg->header, peer, cid);
-
- c = connection_get (cid);
- fwd = check_message (&msg->header,
- cid,
- c,
- peer,
- pid);
-
- /* If something went wrong, discard message. */
- if (GNUNET_SYSERR == fwd)
- {
- GNUNET_break_op (0);
- GCC_check_connections ();
- return;
- }
-
- /* Is this message for us? */
- if (GCC_is_terminal (c, fwd))
- {
- GNUNET_STATISTICS_update (stats, "# received encrypted", 1, GNUNET_NO);
-
- if (NULL == c->t)
- {
- GNUNET_break (GNUNET_NO != c->destroy);
- return;
- }
- GCT_handle_encrypted (c->t, &msg->header);
- GCC_send_ack (c, fwd, GNUNET_NO);
- GCC_check_connections ();
- return;
- }
+ int old_ready;
+ int new_ready;
- /* Message not for us: forward to next hop */
- LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
- GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
- GNUNET_assert (NULL == GCC_send_prebuilt_message (&msg->header, 0, 0, c, fwd,
- GNUNET_NO, NULL, NULL));
- GCC_check_connections ();
+ if ( (new_state == cc->state) &&
+ (new_mqm_ready == cc->mqm_ready) )
+ return; /* no change, nothing to do */
+ old_ready = ( (CADET_CONNECTION_READY == cc->state) &&
+ (GNUNET_YES == cc->mqm_ready) );
+ new_ready = ( (CADET_CONNECTION_READY == new_state) &&
+ (GNUNET_YES == new_mqm_ready) );
+ cc->state = new_state;
+ cc->mqm_ready = new_mqm_ready;
+ if (old_ready != new_ready)
+ cc->ready_cb (cc->ready_cb_cls,
+ new_ready);
}
/**
- * Initialize the connections subsystem
+ * Destroy a connection, part of the internal implementation. Called
+ * only from #GCC_destroy_from_core() or #GCC_destroy_from_tunnel().
*
- * @param c Configuration handle.
+ * @param cc connection to destroy
*/
-void
-GCC_init (const struct GNUNET_CONFIGURATION_Handle *c)
+static void
+GCC_destroy (struct CadetConnection *cc)
{
- LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_MSGS_QUEUE",
- &max_msgs_queue))
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Destroying %s\n",
+ GCC_2s (cc));
+ if (NULL != cc->mq_man)
{
- GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
- "CADET", "MAX_MSGS_QUEUE", "MISSING");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ GCP_request_mq_cancel (cc->mq_man,
+ NULL);
+ cc->mq_man = NULL;
}
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_CONNECTIONS",
- &max_connections))
+ if (NULL != cc->task)
{
- GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
- "CADET", "MAX_CONNECTIONS", "MISSING");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ GNUNET_SCHEDULER_cancel (cc->task);
+ cc->task = NULL;
}
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_time (c, "CADET", "REFRESH_CONNECTION_TIME",
- &refresh_connection_time))
+ if (NULL != cc->keepalive_qe)
{
- GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
- "CADET", "REFRESH_CONNECTION_TIME", "MISSING");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ GCT_send_cancel (cc->keepalive_qe);
+ cc->keepalive_qe = NULL;
}
- create_connection_time = GNUNET_TIME_UNIT_SECONDS;
- connections = GNUNET_CONTAINER_multihashmap_create (1024, GNUNET_NO);
+ GCPP_del_connection (cc->path,
+ cc->off,
+ cc);
+ for (unsigned int i=0;i<cc->off;i++)
+ GCP_remove_connection (GCPP_get_peer_at_offset (cc->path,
+ i),
+ cc);
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multishortmap_remove (connections,
+ &GCC_get_id (cc)->connection_of_tunnel,
+ cc));
+ GNUNET_free (cc);
}
-/**
- * Destroy each connection on shutdown.
- *
- * @param cls Closure (unused).
- * @param key Current key code (CID, unused).
- * @param value Value in the hash map (`struct CadetConnection`)
- *
- * @return #GNUNET_YES, because we should continue to iterate
- */
-static int
-shutdown_iterator (void *cls,
- const struct GNUNET_HashCode *key,
- void *value)
-{
- struct CadetConnection *c = value;
-
- c->state = CADET_CONNECTION_DESTROYED;
- GCC_destroy (c);
- return GNUNET_YES;
-}
-
/**
- * Shut down the connections subsystem.
+ * Destroy a connection, called when the CORE layer is already done
+ * (i.e. has received a BROKEN message), but if we still have to
+ * communicate the destruction of the connection to the tunnel (if one
+ * exists).
+ *
+ * @param cc connection to destroy
*/
void
-GCC_shutdown (void)
-{
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Shutting down connections\n");
- GCC_check_connections ();
- GNUNET_CONTAINER_multihashmap_iterate (connections,
- &shutdown_iterator,
- NULL);
- GNUNET_CONTAINER_multihashmap_destroy (connections);
- connections = NULL;
-}
-
-
-/**
- * Create a connection.
- *
- * @param cid Connection ID (either created locally or imposed remotely).
- * @param t Tunnel this connection belongs to (or NULL for transit connections);
- * @param path Path this connection has to use (copy is made).
- * @param own_pos Own position in the @c path path.
- *
- * @return Newly created connection.
- * NULL in case of error: own id not in path, wrong neighbors, ...
-*/
-struct CadetConnection *
-GCC_new (const struct GNUNET_CADET_Hash *cid,
- struct CadetTunnel *t,
- struct CadetPeerPath *path,
- unsigned int own_pos)
+GCC_destroy_without_core (struct CadetConnection *cc)
{
- struct CadetConnection *c;
- struct CadetPeerPath *cpath;
-
- GCC_check_connections ();
- cpath = path_duplicate (path);
- GNUNET_assert (NULL != cpath);
- c = GNUNET_new (struct CadetConnection);
- c->id = *cid;
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multihashmap_put (connections,
- GCC_get_h (c), c,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- fc_init (&c->fwd_fc);
- fc_init (&c->bck_fc);
- c->fwd_fc.c = c;
- c->bck_fc.c = c;
-
- c->t = t;
- GNUNET_assert (own_pos <= cpath->length - 1);
- c->own_pos = own_pos;
- c->path = cpath;
- cpath->c = c;
- if (GNUNET_OK != register_neighbors (c))
+ if (NULL != cc->ct)
{
- if (0 == own_pos)
- {
- /* We were the origin of this request, this means we have invalid
- * info about the paths to reach the destination. We must invalidate
- * the *original* path to avoid trying it again in the next minute.
- */
- if (2 < path->length)
- path_invalidate (path);
- else
- {
- GNUNET_break (0);
- GCT_debug(t, GNUNET_ERROR_TYPE_WARNING);
- }
- c->t = NULL;
- }
- path_destroy (c->path);
- c->path = NULL;
- GCC_destroy (c);
- return NULL;
+ GCT_connection_lost (cc->ct);
+ cc->ct = NULL;
}
- LOG (GNUNET_ERROR_TYPE_INFO, "New connection %s\n", GCC_2s (c));
- GCC_check_connections ();
- return c;
+ GCC_destroy (cc);
}
/**
- * Connection is no longer needed: destroy it.
- *
- * Cancels all pending traffic (including possible DESTROY messages), all
- * maintenance tasks and removes the connection from neighbor peers and tunnel.
+ * Destroy a connection, called if the tunnel association with the
+ * connection was already broken, but we still need to notify the CORE
+ * layer about the breakage.
*
- * @param c Connection to destroy.
+ * @param cc connection to destroy
*/
void
-GCC_destroy (struct CadetConnection *c)
+GCC_destroy_without_tunnel (struct CadetConnection *cc)
{
- GCC_check_connections ();
- if (NULL == c)
+ cc->ct = NULL;
+ if ( (CADET_CONNECTION_SENDING_CREATE != cc->state) &&
+ (NULL != cc->mq_man) )
{
- GNUNET_break (0);
- return;
- }
-
- if (2 == c->destroy) /* cancel queues -> GCP_queue_cancel -> q_destroy -> */
- return; /* -> message_sent -> GCC_destroy. Don't loop. */
- c->destroy = 2;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "destroying connection %s\n",
- GCC_2s (c));
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- " fc's f: %p, b: %p\n",
- &c->fwd_fc, &c->bck_fc);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- " fc tasks f: %u, b: %u\n",
- c->fwd_fc.poll_task,
- c->bck_fc.poll_task);
+ struct GNUNET_MQ_Envelope *env;
+ struct GNUNET_CADET_ConnectionDestroyMessage *destroy_msg;
- /* Cancel all traffic */
- if (NULL != c->path)
- {
- connection_cancel_queues (c, GNUNET_YES);
- connection_cancel_queues (c, GNUNET_NO);
- if (NULL != c->maintenance_q)
- {
- GCP_send_cancel (c->maintenance_q);
- c->maintenance_q = NULL;
- }
- }
- unregister_neighbors (c);
- path_destroy (c->path);
- c->path = NULL;
-
- /* Delete from tunnel */
- if (NULL != c->t)
- GCT_remove_connection (c->t, c);
-
- if (NULL != c->check_duplicates_task)
- GNUNET_SCHEDULER_cancel (c->check_duplicates_task);
- if (NULL != c->fwd_maintenance_task)
- GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
- if (NULL != c->bck_maintenance_task)
- GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
-
- if (GNUNET_NO == c->was_removed)
- {
- GNUNET_break (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (connections,
- GCC_get_h (c),
- c));
+ /* Need to notify next hop that we are down. */
+ env = GNUNET_MQ_msg (destroy_msg,
+ GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY);
+ destroy_msg->cid = cc->cid;
+ GCP_request_mq_cancel (cc->mq_man,
+ env);
+ cc->mq_man = NULL;
}
- GNUNET_STATISTICS_update (stats,
- "# connections",
- -1,
- GNUNET_NO);
- GNUNET_free (c);
- GCC_check_connections ();
+ GCC_destroy (cc);
}
/**
- * Get the connection ID.
+ * Return the tunnel associated with this connection.
*
- * @param c Connection to get the ID from.
- *
- * @return ID of the connection.
+ * @param cc connection to query
+ * @return corresponding entry in the tunnel's connection list
*/
-const struct GNUNET_CADET_Hash *
-GCC_get_id (const struct CadetConnection *c)
+struct CadetTConnection *
+GCC_get_ct (struct CadetConnection *cc)
{
- return &c->id;
+ return cc->ct;
}
/**
- * Get the connection ID.
- *
- * @param c Connection to get the ID from.
+ * Obtain performance @a metrics from @a cc.
*
- * @return ID of the connection.
+ * @param cc connection to query
+ * @return the metrics
*/
-const struct GNUNET_HashCode *
-GCC_get_h (const struct CadetConnection *c)
+const struct CadetConnectionMetrics *
+GCC_get_metrics (struct CadetConnection *cc)
{
- return GC_h2hc (&c->id);
+ return &cc->metrics;
}
/**
- * Get the connection path.
+ * Send a #GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE through the
+ * tunnel to prevent it from timing out.
*
- * @param c Connection to get the path from.
- *
- * @return path used by the connection.
+ * @param cls the `struct CadetConnection` to keep alive.
*/
-const struct CadetPeerPath *
-GCC_get_path (const struct CadetConnection *c)
-{
- if (GNUNET_NO == c->destroy)
- return c->path;
- return NULL;
-}
+static void
+send_keepalive (void *cls);
/**
- * Get the connection state.
+ * Keepalive was transmitted. Remember this, and possibly
+ * schedule the next one.
*
- * @param c Connection to get the state from.
- *
- * @return state of the connection.
+ * @param cls the `struct CadetConnection` to keep alive.
+ * @param cid identifier of the connection within the tunnel, NULL
+ * if transmission failed
*/
-enum CadetConnectionState
-GCC_get_state (const struct CadetConnection *c)
+static void
+keepalive_done (void *cls,
+ const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
{
- return c->state;
-}
+ struct CadetConnection *cc = cls;
-/**
- * Get the connection tunnel.
- *
- * @param c Connection to get the tunnel from.
- *
- * @return tunnel of the connection.
- */
-struct CadetTunnel *
-GCC_get_tunnel (const struct CadetConnection *c)
-{
- return c->t;
+ cc->keepalive_qe = NULL;
+ if ( (GNUNET_YES == cc->mqm_ready) &&
+ (NULL == cc->task) )
+ cc->task = GNUNET_SCHEDULER_add_delayed (keepalive_period,
+ &send_keepalive,
+ cc);
}
/**
- * Get free buffer space in a connection.
- *
- * @param c Connection.
- * @param fwd Is query about FWD traffic?
+ * Send a #GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE through the
+ * tunnel to prevent it from timing out.
*
- * @return Free buffer space [0 - max_msgs_queue/max_connections]
+ * @param cls the `struct CadetConnection` to keep alive.
*/
-unsigned int
-GCC_get_buffer (struct CadetConnection *c, int fwd)
+static void
+send_keepalive (void *cls)
{
- struct CadetFlowControl *fc;
-
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
+ struct CadetConnection *cc = cls;
+ struct GNUNET_MessageHeader msg;
- LOG (GNUNET_ERROR_TYPE_DEBUG, " Get %s buffer on %s: %u - %u\n",
- GC_f2s (fwd), GCC_2s (c), fc->queue_max, fc->queue_n);
- GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
+ cc->task = NULL;
+ if (CADET_TUNNEL_KEY_OK != GCT_get_estate (cc->ct->t))
+ {
+ /* Tunnel not yet ready, wait with keepalives... */
+ cc->task = GNUNET_SCHEDULER_add_delayed (keepalive_period,
+ &send_keepalive,
+ cc);
+ return;
+ }
+ GNUNET_assert (NULL != cc->ct);
+ GNUNET_assert (GNUNET_YES == cc->mqm_ready);
+ GNUNET_assert (NULL == cc->keepalive_qe);
+ LOG (GNUNET_ERROR_TYPE_INFO,
+ "Sending KEEPALIVE on behalf of %s via %s\n",
+ GCC_2s (cc),
+ GCT_2s (cc->ct->t));
+ GNUNET_STATISTICS_update (stats,
+ "# keepalives sent",
+ 1,
+ GNUNET_NO);
+ msg.size = htons (sizeof (msg));
+ msg.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE);
- return (fc->queue_max - fc->queue_n);
+ cc->keepalive_qe
+ = GCT_send (cc->ct->t,
+ &msg,
+ &keepalive_done,
+ cc);
}
/**
- * Get how many messages have we allowed to send to us from a direction.
+ * We sent a message for which we expect to receive an ACK via
+ * the connection identified by @a cti.
*
- * @param c Connection.
- * @param fwd Are we asking about traffic from FWD (BCK messages)?
- *
- * @return last_ack_sent - last_pid_recv
+ * @param cid connection identifier where we expect an ACK
*/
-unsigned int
-GCC_get_allowed (struct CadetConnection *c, int fwd)
+void
+GCC_ack_expected (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
{
- struct CadetFlowControl *fc;
+ struct CadetConnection *cc;
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
- if (CADET_CONNECTION_READY != c->state
- || GC_is_pid_bigger (fc->last_pid_recv, fc->last_ack_sent))
- {
- return 0;
- }
- return (fc->last_ack_sent - fc->last_pid_recv);
+ cc = GCC_lookup (cid);
+ if (NULL == cc)
+ return; /* whopise, connection alredy down? */
+ cc->metrics.num_acked_transmissions++;
}
/**
- * Get messages queued in a connection.
+ * We observed an ACK for a message that was originally sent via
+ * the connection identified by @a cti.
*
- * @param c Connection.
- * @param fwd Is query about FWD traffic?
- *
- * @return Number of messages queued.
+ * @param cti connection identifier where we got an ACK for a message
+ * that was originally sent via this connection (the ACK
+ * may have gotten back to us via a different connection).
*/
-unsigned int
-GCC_get_qn (struct CadetConnection *c, int fwd)
+void
+GCC_ack_observed (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
{
- struct CadetFlowControl *fc;
+ struct CadetConnection *cc;
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
-
- return fc->queue_n;
+ cc = GCC_lookup (cid);
+ if (NULL == cc)
+ return; /* whopise, connection alredy down? */
+ cc->metrics.num_successes++;
}
/**
- * Get next PID to use.
- *
- * @param c Connection.
- * @param fwd Is query about FWD traffic?
+ * We observed some the given @a latency on the connection
+ * identified by @a cti. (The same connection was taken
+ * in both directions.)
*
- * @return Next PID to use.
+ * @param cid connection identifier where we measured latency
+ * @param latency the observed latency
*/
-uint32_t
-GCC_get_pid (struct CadetConnection *c, int fwd)
+void
+GCC_latency_observed (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid,
+ struct GNUNET_TIME_Relative latency)
{
- struct CadetFlowControl *fc;
- uint32_t pid;
+ struct CadetConnection *cc;
+ double weight;
+ double result;
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
- pid = fc->next_pid;
- fc->next_pid++;
- return pid;
+ cc = GCC_lookup (cid);
+ if (NULL == cc)
+ return; /* whopise, connection alredy down? */
+ GNUNET_STATISTICS_update (stats,
+ "# latencies observed",
+ 1,
+ GNUNET_NO);
+ cc->latency_datapoints++;
+ if (cc->latency_datapoints >= 7)
+ weight = 7.0;
+ else
+ weight = cc->latency_datapoints;
+ /* Compute weighted average, giving at MOST weight 7 to the
+ existing values, or less if that value is based on fewer than 7
+ measurements. */
+ result = (weight * cc->metrics.aged_latency.rel_value_us) + 1.0 * latency.rel_value_us;
+ result /= (weight + 1.0);
+ cc->metrics.aged_latency.rel_value_us = (uint64_t) result;
}
/**
- * Allow the connection to advertise a buffer of the given size.
+ * A #GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK was received for this connection, implying
+ * that the end-to-end connection is up. Process it.
*
- * The connection will send an @c fwd ACK message (so: in direction !fwd)
- * allowing up to last_pid_recv + buffer.
- *
- * @param c Connection.
- * @param buffer How many more messages the connection can accept.
- * @param fwd Is this about FWD traffic? (The ack will go dest->root).
+ * @param cc the connection that got the ACK.
*/
void
-GCC_allow (struct CadetConnection *c, unsigned int buffer, int fwd)
+GCC_handle_connection_create_ack (struct CadetConnection *cc)
{
- LOG (GNUNET_ERROR_TYPE_DEBUG, " allowing %s %u messages %s\n",
- GCC_2s (c), buffer, GC_f2s (fwd));
- send_ack (c, buffer, fwd, GNUNET_NO);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received CADET_CONNECTION_CREATE_ACK for %s in state %d (%s)\n",
+ GCC_2s (cc),
+ cc->state,
+ (GNUNET_YES == cc->mqm_ready) ? "MQM ready" : "MQM busy");
+ if (CADET_CONNECTION_READY == cc->state)
+ return; /* Duplicate ACK, ignore */
+ if (NULL != cc->task)
+ {
+ GNUNET_SCHEDULER_cancel (cc->task);
+ cc->task = NULL;
+ }
+ cc->metrics.age = GNUNET_TIME_absolute_get ();
+ update_state (cc,
+ CADET_CONNECTION_READY,
+ cc->mqm_ready);
+ if ( (NULL == cc->keepalive_qe) &&
+ (GNUNET_YES == cc->mqm_ready) &&
+ (NULL == cc->task) )
+ cc->task = GNUNET_SCHEDULER_add_delayed (keepalive_period,
+ &send_keepalive,
+ cc);
}
/**
- * Notify other peers on a connection of a broken link. Mark connections
- * to destroy after all traffic has been sent.
+ * Handle KX message.
*
- * @param c Connection on which there has been a disconnection.
- * @param peer Peer that disconnected.
+ * @param cc connection that received encrypted message
+ * @param msg the key exchange message
*/
void
-GCC_neighbor_disconnected (struct CadetConnection *c, struct CadetPeer *peer)
+GCC_handle_kx (struct CadetConnection *cc,
+ const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg)
{
- struct CadetFlowControl *fc;
- char peer_name[16];
- int fwd;
-
- GCC_check_connections ();
- strncpy (peer_name, GCP_2s (peer), 16);
- peer_name[15] = '\0';
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "shutting down %s, %s disconnected\n",
- GCC_2s (c), peer_name);
-
- invalidate_paths (c, peer);
-
- fwd = is_fwd (c, peer);
- if (GNUNET_SYSERR == fwd)
+ if (CADET_CONNECTION_SENT == cc->state)
{
- GNUNET_break (0);
- return;
- }
- if ( (GNUNET_YES == GCC_is_terminal (c, fwd)) ||
- (GNUNET_NO != c->destroy) )
- {
- /* Local shutdown, or other peer already down (hence 'c->destroy');
- so there is no one to notify about this, just clean up. */
- GCC_destroy (c);
- GCC_check_connections ();
- return;
+ /* We didn't get the CADET_CONNECTION_CREATE_ACK, but instead got payload. That's fine,
+ clearly something is working, so pretend we got an ACK. */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Faking connection CADET_CONNECTION_CREATE_ACK for %s due to KX\n",
+ GCC_2s (cc));
+ GCC_handle_connection_create_ack (cc);
}
- /* Mark FlowControl towards the peer as unavaliable. */
- fc = fwd ? &c->bck_fc : &c->fwd_fc;
- fc->queue_max = 0;
-
- send_broken (c, &my_full_id, GCP_get_id (peer), fwd);
-
- /* Connection will have at least one pending message
- * (the one we just scheduled), so delay destruction
- * and remove from map so we don't use accidentally. */
- mark_destroyed (c);
- GNUNET_assert (GNUNET_NO == c->was_removed);
- c->was_removed = GNUNET_YES;
- GNUNET_break (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (connections,
- GCC_get_h (c),
- c));
- /* Cancel queue in the direction that just died. */
- connection_cancel_queues (c, ! fwd);
- GCC_stop_poll (c, ! fwd);
- unregister_neighbors (c);
- GCC_check_connections ();
+ GCT_handle_kx (cc->ct,
+ msg);
}
/**
- * Is this peer the first one on the connection?
- *
- * @param c Connection.
- * @param fwd Is this about fwd traffic?
+ * Handle KX_AUTH message.
*
- * @return #GNUNET_YES if origin, #GNUNET_NO if relay/terminal.
+ * @param cc connection that received encrypted message
+ * @param msg the key exchange message
*/
-int
-GCC_is_origin (struct CadetConnection *c, int fwd)
+void
+GCC_handle_kx_auth (struct CadetConnection *cc,
+ const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage *msg)
{
- if (!fwd && c->path->length - 1 == c->own_pos )
- return GNUNET_YES;
- if (fwd && 0 == c->own_pos)
- return GNUNET_YES;
- return GNUNET_NO;
+ if (CADET_CONNECTION_SENT == cc->state)
+ {
+ /* We didn't get the CADET_CONNECTION_CREATE_ACK, but instead got payload. That's fine,
+ clearly something is working, so pretend we got an ACK. */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Faking connection CADET_CONNECTION_CREATE_ACK for %s due to KX\n",
+ GCC_2s (cc));
+ GCC_handle_connection_create_ack (cc);
+ }
+ GCT_handle_kx_auth (cc->ct,
+ msg);
}
/**
- * Is this peer the last one on the connection?
+ * Handle encrypted message.
*
- * @param c Connection.
- * @param fwd Is this about fwd traffic?
- * Note that the ROOT is the terminal for BCK traffic!
- *
- * @return #GNUNET_YES if terminal, #GNUNET_NO if relay/origin.
+ * @param cc connection that received encrypted message
+ * @param msg the encrypted message to decrypt
*/
-int
-GCC_is_terminal (struct CadetConnection *c, int fwd)
+void
+GCC_handle_encrypted (struct CadetConnection *cc,
+ const struct GNUNET_CADET_TunnelEncryptedMessage *msg)
{
- return GCC_is_origin (c, ! fwd);
+ if (CADET_CONNECTION_SENT == cc->state)
+ {
+ /* We didn't get the CREATE_ACK, but instead got payload. That's fine,
+ clearly something is working, so pretend we got an ACK. */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Faking connection ACK for %s due to ENCRYPTED payload\n",
+ GCC_2s (cc));
+ GCC_handle_connection_create_ack (cc);
+ }
+ cc->metrics.last_use = GNUNET_TIME_absolute_get ();
+ GCT_handle_encrypted (cc->ct,
+ msg);
}
/**
- * See if we are allowed to send by the next hop in the given direction.
- *
- * @param c Connection.
- * @param fwd Is this about fwd traffic?
+ * Send a #GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE message to the
+ * first hop.
*
- * @return #GNUNET_YES in case it's OK to send.
+ * @param cls the `struct CadetConnection` to initiate
*/
-int
-GCC_is_sendable (struct CadetConnection *c, int fwd)
-{
- struct CadetFlowControl *fc;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- " checking sendability of %s traffic on %s\n",
- GC_f2s (fwd), GCC_2s (c));
- if (NULL == c)
- {
- GNUNET_break (0);
- return GNUNET_YES;
- }
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
+static void
+send_create (void *cls)
+{
+ struct CadetConnection *cc = cls;
+ struct GNUNET_CADET_ConnectionCreateMessage *create_msg;
+ struct GNUNET_PeerIdentity *pids;
+ struct GNUNET_MQ_Envelope *env;
+ unsigned int path_length;
+
+ cc->task = NULL;
+ GNUNET_assert (GNUNET_YES == cc->mqm_ready);
+ path_length = GCPP_get_length (cc->path);
+ env = GNUNET_MQ_msg_extra (create_msg,
+ (1 + path_length) * sizeof (struct GNUNET_PeerIdentity),
+ GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
+ create_msg->options = htonl ((uint32_t) cc->options);
+ create_msg->cid = cc->cid;
+ pids = (struct GNUNET_PeerIdentity *) &create_msg[1];
+ pids[0] = my_full_id;
+ for (unsigned int i=0;i<path_length;i++)
+ pids[i + 1] = *GCP_get_id (GCPP_get_peer_at_offset (cc->path,
+ i));
LOG (GNUNET_ERROR_TYPE_DEBUG,
- " last ack recv: %u, last pid sent: %u\n",
- fc->last_ack_recv, fc->last_pid_sent);
- if (GC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable\n");
- return GNUNET_YES;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
- return GNUNET_NO;
+ "Sending CADET_CONNECTION_CREATE message for %s\n",
+ GCC_2s (cc));
+ cc->env = env;
+ update_state (cc,
+ CADET_CONNECTION_SENT,
+ GNUNET_NO);
+ GCP_send (cc->mq_man,
+ env);
}
/**
- * Check if this connection is a direct one (never trim a direct connection).
+ * Send a CREATE_ACK message towards the origin.
*
- * @param c Connection.
- *
- * @return #GNUNET_YES in case it's a direct connection, #GNUNET_NO otherwise.
+ * @param cls the `struct CadetConnection` to initiate
*/
-int
-GCC_is_direct (struct CadetConnection *c)
+static void
+send_create_ack (void *cls)
{
- return (c->path->length == 2) ? GNUNET_YES : GNUNET_NO;
+ struct CadetConnection *cc = cls;
+ struct GNUNET_CADET_ConnectionCreateAckMessage *ack_msg;
+ struct GNUNET_MQ_Envelope *env;
+
+ cc->task = NULL;
+ GNUNET_assert (CADET_CONNECTION_CREATE_RECEIVED == cc->state);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending CONNECTION_CREATE_ACK message for %s\n",
+ GCC_2s (cc));
+ GNUNET_assert (GNUNET_YES == cc->mqm_ready);
+ env = GNUNET_MQ_msg (ack_msg,
+ GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK);
+ ack_msg->cid = cc->cid;
+ cc->env = env;
+ update_state (cc,
+ CADET_CONNECTION_READY,
+ GNUNET_NO);
+ GCP_send (cc->mq_man,
+ env);
}
/**
- * Sends a completely built message on a connection, properly registering
- * all used resources.
+ * We got a #GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE for a
+ * connection that we already have. Either our ACK got lost
+ * or something is fishy. Consider retransmitting the ACK.
*
- * @param message Message to send.
- * @param payload_type Type of payload, in case the message is encrypted.
- * @param payload_id ID of the payload (PID, ACK, ...).
- * @param c Connection on which this message is transmitted.
- * @param fwd Is this a fwd message?
- * @param force Force the connection to accept the message (buffer overfill).
- * @param cont Continuation called once message is sent. Can be NULL.
- * @param cont_cls Closure for @c cont.
- *
- * @return Handle to cancel the message before it's sent.
- * NULL on error or if @c cont is NULL.
- * Invalid on @c cont call.
+ * @param cc connection that got the duplicate CREATE
*/
-struct CadetConnectionQueue *
-GCC_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
- uint16_t payload_type, uint32_t payload_id,
- struct CadetConnection *c, int fwd, int force,
- GCC_sent cont, void *cont_cls)
+void
+GCC_handle_duplicate_create (struct CadetConnection *cc)
{
- struct CadetFlowControl *fc;
- struct CadetConnectionQueue *q;
- uint16_t size;
- uint16_t type;
-
- size = ntohs (message->size);
- type = ntohs (message->type);
-
- GCC_check_connections ();
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
- if (0 == fc->queue_max)
- {
- GNUNET_break (0);
- return NULL;
- }
-
- LOG (GNUNET_ERROR_TYPE_INFO,
- "--> %s (%s %4u) on conn %s (%p) %s [%5u]\n",
- GC_m2s (type), GC_m2s (payload_type), payload_id, GCC_2s (c), c,
- GC_f2s(fwd), size);
- switch (type)
+ if (GNUNET_YES == cc->mqm_ready)
{
- case GNUNET_MESSAGE_TYPE_CADET_AX:
- LOG (GNUNET_ERROR_TYPE_DEBUG, " Q_N+ %p %u\n", fc, fc->queue_n);
- LOG (GNUNET_ERROR_TYPE_DEBUG, "last pid sent %u\n", fc->last_pid_sent);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " ack recv %u\n", fc->last_ack_recv);
- if (GNUNET_NO == force)
- {
- fc->queue_n++;
- }
- break;
-
- case GNUNET_MESSAGE_TYPE_CADET_KX:
- break;
-
- case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
- case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
- GNUNET_break (0); /* Should've used specific functions. */
- break;
-
- case GNUNET_MESSAGE_TYPE_CADET_ACK:
- case GNUNET_MESSAGE_TYPE_CADET_POLL:
- case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
- case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
- GNUNET_assert (GNUNET_YES == force);
- break;
-
- default:
- GNUNET_break (0);
- return NULL;
- }
-
- if (fc->queue_n > fc->queue_max && GNUNET_NO == force)
- {
- GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
- 1, GNUNET_NO);
- GNUNET_break (0);
- LOG (GNUNET_ERROR_TYPE_DEBUG, "queue full: %u/%u\n",
- fc->queue_n, fc->queue_max);
- if (GNUNET_MESSAGE_TYPE_CADET_AX == type)
- {
- fc->queue_n--;
- }
- return NULL; /* Drop this message */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got duplicate CREATE for %s, scheduling another ACK (%s)\n",
+ GCC_2s (cc),
+ (GNUNET_YES == cc->mqm_ready) ? "MQM ready" : "MQM busy");
+ /* Revert back to the state of having only received the 'CREATE',
+ and immediately proceed to send the CREATE_ACK. */
+ update_state (cc,
+ CADET_CONNECTION_CREATE_RECEIVED,
+ cc->mqm_ready);
+ if (NULL != cc->task)
+ GNUNET_SCHEDULER_cancel (cc->task);
+ cc->task = GNUNET_SCHEDULER_add_now (&send_create_ack,
+ cc);
}
-
- LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %s %u\n",
- GCC_2s (c), c->pending_messages);
- c->pending_messages++;
-
- q = GNUNET_new (struct CadetConnectionQueue);
- q->forced = force;
- q->peer_q = GCP_send (get_hop (c, fwd), message,
- payload_type, payload_id,
- c, fwd,
- &conn_message_sent, q);
- if (NULL == q->peer_q)
+ else
{
- LOG (GNUNET_ERROR_TYPE_DEBUG, "dropping msg on %s, NULL q\n", GCC_2s (c));
- GNUNET_free (q);
- GCC_check_connections ();
- return NULL;
+ /* We are currently sending something else back, which
+ can only be an ACK or payload, either of which would
+ do. So actually no need to do anything. */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got duplicate CREATE for %s. MQ is busy, not queueing another ACK\n",
+ GCC_2s (cc));
}
- q->cont = cont;
- q->cont_cls = cont_cls;
- GNUNET_CONTAINER_DLL_insert (fc->q_head, fc->q_tail, q);
- GCC_check_connections ();
- return (NULL == cont) ? NULL : q;
}
/**
- * Cancel a previously sent message while it's in the queue.
+ * There has been a change in the message queue existence for our
+ * peer at the first hop. Adjust accordingly.
*
- * 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.
- *
- * @param q Handle to the queue.
+ * @param cls the `struct CadetConnection`
+ * @param available #GNUNET_YES if sending is now possible,
+ * #GNUNET_NO if sending is no longer possible
+ * #GNUNET_SYSERR if sending is no longer possible
+ * and the last envelope was discarded
*/
-void
-GCC_cancel (struct CadetConnectionQueue *q)
+static void
+manage_first_hop_mq (void *cls,
+ int available)
{
- LOG (GNUNET_ERROR_TYPE_DEBUG, "! GCC cancel message\n");
+ struct CadetConnection *cc = cls;
+
+ if (GNUNET_YES != available)
+ {
+ /* Connection is down, for now... */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Core MQ for %s went down\n",
+ GCC_2s (cc));
+ update_state (cc,
+ CADET_CONNECTION_NEW,
+ GNUNET_NO);
+ cc->retry_delay = GNUNET_TIME_UNIT_ZERO;
+ if (NULL != cc->task)
+ {
+ GNUNET_SCHEDULER_cancel (cc->task);
+ cc->task = NULL;
+ }
+ return;
+ }
- /* send_cancel calls message_sent, which calls q->cont and frees q */
- GCP_send_cancel (q->peer_q);
- GCC_check_connections ();
+ update_state (cc,
+ cc->state,
+ GNUNET_YES);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Core MQ for %s became available in state %d\n",
+ GCC_2s (cc),
+ cc->state);
+ switch (cc->state)
+ {
+ case CADET_CONNECTION_NEW:
+ /* Transmit immediately */
+ cc->task = GNUNET_SCHEDULER_add_now (&send_create,
+ cc);
+ break;
+ case CADET_CONNECTION_SENDING_CREATE:
+ /* Should not be possible to be called in this state. */
+ GNUNET_assert (0);
+ break;
+ case CADET_CONNECTION_SENT:
+ /* Retry a bit later... */
+ cc->retry_delay = GNUNET_TIME_STD_BACKOFF (cc->retry_delay);
+ cc->task = GNUNET_SCHEDULER_add_delayed (cc->retry_delay,
+ &send_create,
+ cc);
+ break;
+ case CADET_CONNECTION_CREATE_RECEIVED:
+ /* We got the 'CREATE' (incoming connection), should send the CREATE_ACK */
+ cc->metrics.age = GNUNET_TIME_absolute_get ();
+ cc->task = GNUNET_SCHEDULER_add_now (&send_create_ack,
+ cc);
+ break;
+ case CADET_CONNECTION_READY:
+ if ( (NULL == cc->keepalive_qe) &&
+ (GNUNET_YES == cc->mqm_ready) &&
+ (NULL == cc->task) )
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Scheduling keepalive for %s in %s\n",
+ GCC_2s (cc),
+ GNUNET_STRINGS_relative_time_to_string (keepalive_period,
+ GNUNET_YES));
+ cc->task = GNUNET_SCHEDULER_add_delayed (keepalive_period,
+ &send_keepalive,
+ cc);
+ }
+ break;
+ }
}
/**
- * Sends a CREATE CONNECTION message for a path to a peer.
- * Changes the connection and tunnel states if necessary.
+ * Create a connection to @a destination via @a path and notify @a cb
+ * whenever we are ready for more data. Shared logic independent of
+ * who is initiating the connection.
*
- * @param c Connection to create.
+ * @param destination where to go
+ * @param path which path to take (may not be the full path)
+ * @param off offset of @a destination on @a path
+ * @param options options for the connection
+ * @param ct which tunnel uses this connection
+ * @param init_state initial state for the connection
+ * @param ready_cb function to call when ready to transmit
+ * @param ready_cb_cls closure for @a cb
+ * @return handle to the connection
*/
-void
-GCC_send_create (struct CadetConnection *c)
-{
- enum CadetTunnelCState state;
- size_t size;
-
- GCC_check_connections ();
- size = sizeof (struct GNUNET_CADET_ConnectionCreate);
- size += c->path->length * sizeof (struct GNUNET_PeerIdentity);
- {
- /* Allocate message on the stack */
- unsigned char cbuf[size];
- struct GNUNET_CADET_ConnectionCreate *msg;
- struct GNUNET_PeerIdentity *peers;
-
- msg = (struct GNUNET_CADET_ConnectionCreate *) cbuf;
- msg->header.size = htons (size);
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
- msg->reserved = htonl (0);
- msg->cid = *GCC_get_id (c);
- peers = (struct GNUNET_PeerIdentity *) &msg[1];
- for (int i = 0; i < c->path->length; i++)
+static struct CadetConnection *
+connection_create (struct CadetPeer *destination,
+ struct CadetPeerPath *path,
+ unsigned int off,
+ enum GNUNET_CADET_ChannelOption options,
+ struct CadetTConnection *ct,
+ const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid,
+ enum CadetConnectionState init_state,
+ GCC_ReadyCallback ready_cb,
+ void *ready_cb_cls)
+{
+ struct CadetConnection *cc;
+ struct CadetPeer *first_hop;
+
+ cc = GNUNET_new (struct CadetConnection);
+ cc->options = options;
+ cc->state = init_state;
+ cc->ct = ct;
+ cc->cid = *cid;
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multishortmap_put (connections,
+ &GCC_get_id (cc)->connection_of_tunnel,
+ cc,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ cc->ready_cb = ready_cb;
+ cc->ready_cb_cls = ready_cb_cls;
+ cc->path = path;
+ cc->off = off;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Creating %s using path %s\n",
+ GCC_2s (cc),
+ GCPP_2s (path));
+ GCPP_add_connection (path,
+ off,
+ cc);
+ for (unsigned int i=0;i<off;i++)
+ GCP_add_connection (GCPP_get_peer_at_offset (path,
+ i),
+ cc);
+
+ first_hop = GCPP_get_peer_at_offset (path,
+ 0);
+ cc->mq_man = GCP_request_mq (first_hop,
+ &manage_first_hop_mq,
+ cc);
+ return cc;
+}
+
+
+/**
+ * Create a connection to @a destination via @a path and
+ * notify @a cb whenever we are ready for more data. This
+ * is an inbound tunnel, so we must use the existing @a cid
+ *
+ * @param destination where to go
+ * @param path which path to take (may not be the full path)
+ * @param options options for the connection
+ * @param ct which tunnel uses this connection
+ * @param ready_cb function to call when ready to transmit
+ * @param ready_cb_cls closure for @a cb
+ * @return handle to the connection, NULL if we already have
+ * a connection that takes precedence on @a path
+ */
+struct CadetConnection *
+GCC_create_inbound (struct CadetPeer *destination,
+ struct CadetPeerPath *path,
+ enum GNUNET_CADET_ChannelOption options,
+ struct CadetTConnection *ct,
+ const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid,
+ GCC_ReadyCallback ready_cb,
+ void *ready_cb_cls)
+{
+ struct CadetConnection *cc;
+ unsigned int off;
+
+ off = GCPP_find_peer (path,
+ destination);
+ GNUNET_assert (UINT_MAX != off);
+ cc = GCPP_get_connection (path,
+ destination,
+ off);
+ if (NULL != cc)
+ {
+ int cmp;
+
+ cmp = memcmp (cid,
+ &cc->cid,
+ sizeof (*cid));
+ if (0 == cmp)
+ {
+ /* Two peers picked the SAME random connection identifier at the
+ same time for the same path? Must be malicious. Drop
+ connection (existing and inbound), even if it is the only
+ one. */
+ GNUNET_break_op (0);
+ GCT_connection_lost (cc->ct);
+ GCC_destroy_without_tunnel (cc);
+ return NULL;
+ }
+ if (0 < cmp)
+ {
+ /* drop existing */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got two connections on %s, dropping my existing %s\n",
+ GCPP_2s (path),
+ GCC_2s (cc));
+ GCT_connection_lost (cc->ct);
+ GCC_destroy_without_tunnel (cc);
+ }
+ else
{
- GNUNET_PEER_resolve (c->path->peers[i], peers++);
+ /* keep existing */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got two connections on %s, keeping my existing %s\n",
+ GCPP_2s (path),
+ GCC_2s (cc));
+ return NULL;
}
- GNUNET_assert (NULL == c->maintenance_q);
- c->maintenance_q = GCP_send (get_next_hop (c),
- &msg->header,
- GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0,
- c, GNUNET_YES,
- &conn_message_sent, NULL);
}
- LOG (GNUNET_ERROR_TYPE_INFO, "==> %s %19s on conn %s (%p) FWD [%5u]\n",
- GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE), "",
- GCC_2s (c), c, size);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %p %u (create)\n",
- c, c->pending_messages);
- c->pending_messages++;
-
- state = GCT_get_cstate (c->t);
- if (CADET_TUNNEL_SEARCHING == state || CADET_TUNNEL_NEW == state)
- GCT_change_cstate (c->t, CADET_TUNNEL_WAITING);
- if (CADET_CONNECTION_NEW == c->state)
- connection_change_state (c, CADET_CONNECTION_SENT);
- GCC_check_connections ();
+ return connection_create (destination,
+ path,
+ off,
+ options,
+ ct,
+ cid,
+ CADET_CONNECTION_CREATE_RECEIVED,
+ ready_cb,
+ ready_cb_cls);
}
/**
- * Send an ACK on the appropriate connection/channel, depending on
- * the direction and the position of the peer.
+ * Create a connection to @a destination via @a path and
+ * notify @a cb whenever we are ready for more data.
*
- * @param c Which connection to send the hop-by-hop ACK.
- * @param fwd Is this a fwd ACK? (will go dest->root).
- * @param force Send the ACK even if suboptimal (e.g. requested by POLL).
+ * @param destination where to go
+ * @param path which path to take (may not be the full path)
+ * @param off offset of @a destination on @a path
+ * @param options options for the connection
+ * @param ct tunnel that uses the connection
+ * @param ready_cb function to call when ready to transmit
+ * @param ready_cb_cls closure for @a cb
+ * @return handle to the connection
*/
-void
-GCC_send_ack (struct CadetConnection *c, int fwd, int force)
+struct CadetConnection *
+GCC_create (struct CadetPeer *destination,
+ struct CadetPeerPath *path,
+ unsigned int off,
+ enum GNUNET_CADET_ChannelOption options,
+ struct CadetTConnection *ct,
+ GCC_ReadyCallback ready_cb,
+ void *ready_cb_cls)
{
- unsigned int buffer;
-
- GCC_check_connections ();
- LOG (GNUNET_ERROR_TYPE_DEBUG, "GCC send %s ACK on %s\n",
- GC_f2s (fwd), GCC_2s (c));
-
- if (NULL == c)
- {
- GNUNET_break (0);
- return;
- }
+ struct GNUNET_CADET_ConnectionTunnelIdentifier cid;
- if (GNUNET_NO != c->destroy)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " being destroyed, why bother...\n");
- GCC_check_connections ();
- return;
- }
-
- /* Get available buffer space */
- if (GCC_is_terminal (c, fwd))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from all channels\n");
- buffer = GCT_get_channels_buffer (c->t);
- }
- else
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from one connection\n");
- buffer = GCC_get_buffer (c, fwd);
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
- if (0 == buffer && GNUNET_NO == force)
- {
- GCC_check_connections ();
- return;
- }
-
- /* Send available buffer space */
- if (GNUNET_YES == GCC_is_origin (c, fwd))
- {
- GNUNET_assert (NULL != c->t);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on channels...\n");
- GCT_unchoke_channels (c->t);
- }
- else
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
- send_ack (c, buffer, fwd, force);
- }
- GCC_check_connections ();
+ GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
+ &cid,
+ sizeof (cid));
+ return connection_create (destination,
+ path,
+ off,
+ options,
+ ct,
+ &cid,
+ CADET_CONNECTION_NEW,
+ ready_cb,
+ ready_cb_cls);
}
/**
- * Send a message to all peers in this connection that the connection
- * is no longer valid.
+ * Transmit message @a msg via connection @a cc. Must only be called
+ * (once) after the connection has signalled that it is ready via the
+ * `ready_cb`. Clients can also use #GCC_is_ready() to check if the
+ * connection is right now ready for transmission.
*
- * If some peer should not receive the message, it should be zero'ed out
- * before calling this function.
- *
- * @param c The connection whose peers to notify.
+ * @param cc connection identification
+ * @param env envelope with message to transmit; must NOT
+ * yet have a #GNUNET_MQ_notify_sent() callback attached to it
*/
void
-GCC_send_destroy (struct CadetConnection *c)
+GCC_transmit (struct CadetConnection *cc,
+ struct GNUNET_MQ_Envelope *env)
{
- struct GNUNET_CADET_ConnectionDestroy msg;
-
- if (GNUNET_YES == c->destroy)
- return;
- GCC_check_connections ();
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY);
- msg.cid = c->id;
- msg.reserved = htonl (0);
LOG (GNUNET_ERROR_TYPE_DEBUG,
- " sending connection destroy for connection %s\n",
- GCC_2s (c));
-
- if (GNUNET_NO == GCC_is_terminal (c, GNUNET_YES))
- GNUNET_assert (NULL == GCC_send_prebuilt_message (&msg.header, UINT16_MAX,
- 0, c, GNUNET_YES,
- GNUNET_YES, NULL, NULL));
- if (GNUNET_NO == GCC_is_terminal (c, GNUNET_NO))
- GNUNET_assert (NULL == GCC_send_prebuilt_message (&msg.header, UINT16_MAX,
- 0, c, GNUNET_NO,
- GNUNET_YES, NULL, NULL));
- mark_destroyed (c);
- GCC_check_connections ();
+ "Scheduling message for transmission on %s\n",
+ GCC_2s (cc));
+ GNUNET_assert (GNUNET_YES == cc->mqm_ready);
+ GNUNET_assert (CADET_CONNECTION_READY == cc->state);
+ cc->metrics.last_use = GNUNET_TIME_absolute_get ();
+ cc->mqm_ready = GNUNET_NO;
+ if (NULL != cc->task)
+ {
+ GNUNET_SCHEDULER_cancel (cc->task);
+ cc->task = NULL;
+ }
+ GCP_send (cc->mq_man,
+ env);
}
/**
- * @brief Start a polling timer for the connection.
- *
- * When a neighbor does not accept more traffic on the connection it could be
- * caused by a simple congestion or by a lost ACK. Polling enables to check
- * for the lastest ACK status for a connection.
+ * Obtain the path used by this connection.
*
- * @param c Connection.
- * @param fwd Should we poll in the FWD direction?
+ * @param cc connection
+ * @return path to @a cc
*/
-void
-GCC_start_poll (struct CadetConnection *c, int fwd)
+struct CadetPeerPath *
+GCC_get_path (struct CadetConnection *cc)
{
- struct CadetFlowControl *fc;
-
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
- LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL %s requested\n",
- GC_f2s (fwd));
- if (NULL != fc->poll_task || NULL != fc->poll_msg)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG, " POLL already in progress (t: %p, m: %p)\n",
- fc->poll_task, fc->poll_msg);
- return;
- }
- if (0 == fc->queue_max)
- {
- /* Should not be needed, traffic should've been cancelled. */
- GNUNET_break (0);
- LOG (GNUNET_ERROR_TYPE_DEBUG, " POLL not possible, peer disconnected\n");
- return;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL started on request\n");
- fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
- &send_connection_poll,
- fc);
+ return cc->path;
}
/**
- * @brief Stop polling a connection for ACKs.
+ * Obtain unique ID for the connection.
*
- * Once we have enough ACKs for future traffic, polls are no longer necessary.
- *
- * @param c Connection.
- * @param fwd Should we stop the poll in the FWD direction?
+ * @param cc connection.
+ * @return unique number of the connection
*/
-void
-GCC_stop_poll (struct CadetConnection *c, int fwd)
+const struct GNUNET_CADET_ConnectionTunnelIdentifier *
+GCC_get_id (struct CadetConnection *cc)
{
- struct CadetFlowControl *fc;
-
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
- if (NULL != fc->poll_task)
- {
- GNUNET_SCHEDULER_cancel (fc->poll_task);
- fc->poll_task = NULL;
- }
- if (NULL != fc->poll_msg)
- {
- GCC_cancel (fc->poll_msg);
- fc->poll_msg = NULL;
- }
+ return &cc->cid;
}
/**
* Get a (static) string for a connection.
*
- * @param c Connection.
+ * @param cc Connection.
*/
const char *
-GCC_2s (const struct CadetConnection *c)
+GCC_2s (const struct CadetConnection *cc)
{
- if (NULL == c)
- return "NULL";
+ static char buf[128];
- if (NULL != c->t)
- {
- static char buf[128];
+ if (NULL == cc)
+ return "Connection(NULL)";
- SPRINTF (buf, "%s (->%s)",
- GNUNET_h2s (GC_h2hc (GCC_get_id (c))), GCT_2s (c->t));
+ if (NULL != cc->ct)
+ {
+ GNUNET_snprintf (buf,
+ sizeof (buf),
+ "Connection %s (%s)",
+ GNUNET_sh2s (&cc->cid.connection_of_tunnel),
+ GCT_2s (cc->ct->t));
return buf;
}
- return GNUNET_h2s (GC_h2hc (&c->id));
+ GNUNET_snprintf (buf,
+ sizeof (buf),
+ "Connection %s",
+ GNUNET_sh2s (&cc->cid.connection_of_tunnel));
+ return buf;
}
+#define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-con",__VA_ARGS__)
+
+
/**
- * Log all possible info about the connection state.
+ * Log connection info.
*
- * @param c Connection to debug.
+ * @param cc connection
* @param level Debug level to use.
*/
void
-GCC_debug (const struct CadetConnection *c, enum GNUNET_ErrorType level)
+GCC_debug (struct CadetConnection *cc,
+ enum GNUNET_ErrorType level)
{
+#if !defined(GNUNET_CULL_LOGGING)
int do_log;
- char *s;
do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
"cadet-con",
__FILE__, __FUNCTION__, __LINE__);
if (0 == do_log)
return;
-
- if (NULL == c)
+ if (NULL == cc)
{
- LOG2 (level, "CCC DEBUG NULL CONNECTION\n");
+ LOG2 (level,
+ "Connection (NULL)\n");
return;
}
-
- LOG2 (level, "CCC DEBUG CONNECTION %s\n", GCC_2s (c));
- s = path_2s (c->path);
- LOG2 (level, "CCC path %s, own pos: %u\n", s, c->own_pos);
- GNUNET_free (s);
- LOG2 (level, "CCC state: %s, destroy: %u\n",
- GCC_state2s (c->state), c->destroy);
- LOG2 (level, "CCC pending messages: %u\n", c->pending_messages);
- if (NULL != c->perf)
- LOG2 (level, "CCC us/byte: %f\n", c->perf->avg);
-
- LOG2 (level, "CCC FWD flow control:\n");
- LOG2 (level, "CCC queue: %u/%u\n", c->fwd_fc.queue_n, c->fwd_fc.queue_max);
- LOG2 (level, "CCC last PID sent: %5u, recv: %5u\n",
- c->fwd_fc.last_pid_sent, c->fwd_fc.last_pid_recv);
- LOG2 (level, "CCC last ACK sent: %5u, recv: %5u\n",
- c->fwd_fc.last_ack_sent, c->fwd_fc.last_ack_recv);
- LOG2 (level, "CCC recv PID bitmap: %X\n", c->fwd_fc.recv_bitmap);
- LOG2 (level, "CCC poll: task %d, msg %p, msg_ack %p)\n",
- c->fwd_fc.poll_task, c->fwd_fc.poll_msg, c->fwd_fc.ack_msg);
-
- LOG2 (level, "CCC BCK flow control:\n");
- LOG2 (level, "CCC queue: %u/%u\n", c->bck_fc.queue_n, c->bck_fc.queue_max);
- LOG2 (level, "CCC last PID sent: %5u, recv: %5u\n",
- c->bck_fc.last_pid_sent, c->bck_fc.last_pid_recv);
- LOG2 (level, "CCC last ACK sent: %5u, recv: %5u\n",
- c->bck_fc.last_ack_sent, c->bck_fc.last_ack_recv);
- LOG2 (level, "CCC recv PID bitmap: %X\n", c->bck_fc.recv_bitmap);
- LOG2 (level, "CCC poll: task %d, msg %p, msg_ack %p)\n",
- c->bck_fc.poll_task, c->bck_fc.poll_msg, c->bck_fc.ack_msg);
-
- LOG2 (level, "CCC DEBUG CONNECTION END\n");
+ LOG2 (level,
+ "%s to %s via path %s in state %d is %s\n",
+ GCC_2s (cc),
+ GCP_2s (cc->destination),
+ GCPP_2s (cc->path),
+ cc->state,
+ (GNUNET_YES == cc->mqm_ready) ? "ready" : "busy");
+#endif
}
+
+/* end of gnunet-service-cadet_connection.c */
projects / oweals / gnunet.git / blobdiff