*/
#include "platform.h"
-#include "gnunet_crypto_lib.h"
+#include "gnunet_util_lib.h"
#include "mesh_enc.h"
#include "mesh_protocol_enc.h"
#include "mesh_path.h"
#include "gnunet_dht_service.h"
#include "gnunet_statistics_service.h"
+#include "gnunet-service-mesh_local.h"
+#include "gnunet-service-mesh_channel.h"
+#include "gnunet-service-mesh_connection.h"
+
#define MESH_BLOOM_SIZE 128
#define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
GNUNET_TIME_UNIT_MINUTES,\
};
-/**
- * All the states a connection can be in.
- */
-enum MeshConnectionState
-{
- /**
- * Uninitialized status, should never appear in operation.
- */
- MESH_CONNECTION_NEW,
-
- /**
- * Connection create message sent, waiting for ACK.
- */
- MESH_CONNECTION_SENT,
-
- /**
- * Connection ACK sent, waiting for ACK.
- */
- MESH_CONNECTION_ACK,
-
- /**
- * Connection confirmed, ready to carry traffic.
- */
- MESH_CONNECTION_READY,
-};
-
-
-/**
- * All the states a connection can be in.
- */
-enum MeshChannelState
-{
- /**
- * Uninitialized status, should never appear in operation.
- */
- MESH_CHANNEL_NEW,
-
- /**
- * Connection create message sent, waiting for ACK.
- */
- MESH_CHANNEL_SENT,
-
- /**
- * Connection confirmed, ready to carry traffic..
- */
- MESH_CHANNEL_READY,
-};
-
/******************************************************************************/
/************************ DATA STRUCTURES ****************************/
struct MeshPeer;
struct MeshTunnel2;
struct MeshConnection;
-struct MeshChannel;
-struct MeshChannelReliability;
-
-
-/**
- * Struct containing info about a queued transmission to this peer
- */
-struct MeshPeerQueue
-{
- /**
- * DLL next
- */
- struct MeshPeerQueue *next;
-
- /**
- * DLL previous
- */
- struct MeshPeerQueue *prev;
-
- /**
- * Peer this transmission is directed to.
- */
- struct MeshPeer *peer;
-
- /**
- * Connection this message belongs to.
- */
- struct MeshConnection *c;
-
- /**
- * Is FWD in c?
- */
- int fwd;
-
- /**
- * Channel this message belongs to, if known.
- */
- struct MeshChannel *ch;
-
- /**
- * Pointer to info stucture used as cls.
- */
- void *cls;
-
- /**
- * Type of message
- */
- uint16_t type;
-
- /**
- * Size of the message
- */
- size_t size;
-};
-
-
-/**
- * Struct to encapsulate all the Flow Control information to a peer to which
- * we are directly connected (on a core level).
- */
-struct MeshFlowControl
-{
- /**
- * Connection this controls.
- */
- struct MeshConnection *c;
-
- /**
- * How many messages are in the queue on this connection.
- */
- unsigned int queue_n;
-
- /**
- * How many messages do we accept in the queue.
- */
- unsigned int queue_max;
-
- /**
- * Next ID to use.
- */
- 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;
-
- /**
- * 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.
- */
- GNUNET_SCHEDULER_TaskIdentifier poll_task;
- /**
- * How frequently to poll for ACKs.
- */
- struct GNUNET_TIME_Relative poll_time;
-};
/**
};
-/**
- * Info needed to retry a message in case it gets lost.
- */
-struct MeshReliableMessage
-{
- /**
- * Double linked list, FIFO style
- */
- struct MeshReliableMessage *next;
- struct MeshReliableMessage *prev;
-
- /**
- * Type of message (payload, channel management).
- */
- int16_t type;
-
- /**
- * Tunnel Reliability queue this message is in.
- */
- struct MeshChannelReliability *rel;
-
- /**
- * ID of the message (ACK needed to free)
- */
- uint32_t mid;
-
- /**
- * When was this message issued (to calculate ACK delay)
- */
- struct GNUNET_TIME_Absolute timestamp;
-
- /* struct GNUNET_MESH_Data with payload */
-};
/**
- * Info about the traffic state for a client in a channel.
+ * Struct used to queue messages in a tunnel.
*/
-struct MeshChannelReliability
+struct MeshTunnelQueue
{
- /**
- * Channel this is about.
- */
- struct MeshChannel *ch;
-
- /**
- * DLL of messages sent and not yet ACK'd.
- */
- struct MeshReliableMessage *head_sent;
- struct MeshReliableMessage *tail_sent;
-
- /**
- * Messages pending to send.
- */
- unsigned int n_sent;
-
- /**
- * DLL of messages received out of order.
- */
- struct MeshReliableMessage *head_recv;
- struct MeshReliableMessage *tail_recv;
-
- /**
- * Messages received.
- */
- unsigned int n_recv;
-
- /**
- * Next MID to use for outgoing traffic.
- */
- uint32_t mid_send;
-
- /**
- * Next MID expected for incoming traffic.
- */
- uint32_t mid_recv;
-
- /**
- * Can we send data to the client?
- */
- int client_ready;
-
- /**
- * Task to resend/poll in case no ACK is received.
- */
- GNUNET_SCHEDULER_TaskIdentifier retry_task;
+ /**
+ * DLL
+ */
+ struct MeshTunnelQueue *next;
+ struct MeshTunnelQueue *prev;
- /**
- * Counter for exponential backoff.
- */
- struct GNUNET_TIME_Relative retry_timer;
+ /**
+ * Channel.
+ */
+ struct MeshChannel *ch;
- /**
- * How long does it usually take to get an ACK.
- */
- struct GNUNET_TIME_Relative expected_delay;
+ /**
+ * Message to send.
+ */
+ /* struct GNUNET_MessageHeader *msg; */
};
/**
- * Struct containing all information regarding a channel to a remote client.
+ * Struct containing all information regarding a tunnel to a peer.
*/
-struct MeshChannel
+struct MeshTunnel2
{
/**
- * Tunnel this channel is in.
- */
- struct MeshTunnel2 *t;
-
- /**
- * Double linked list.
- */
- struct MeshChannel *next;
- struct MeshChannel *prev;
-
- /**
- * Destination port of the channel.
- */
- uint32_t port;
-
- /**
- * Global channel number ( < GNUNET_MESH_LOCAL_CHANNEL_ID_CLI)
- */
- MESH_ChannelNumber gid;
-
- /**
- * Local tunnel number for root (owner) client.
- * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_CLI or 0 )
- */
- MESH_ChannelNumber lid_root;
-
- /**
- * Local tunnel number for local destination clients (incoming number)
- * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV or 0).
- */
- MESH_ChannelNumber lid_dest;
-
- /**
- * Channel state.
- */
- enum MeshChannelState state;
-
- /**
- * Is the tunnel bufferless (minimum latency)?
- */
- int nobuffer;
-
- /**
- * Is the tunnel reliable?
- */
- int reliable;
-
- /**
- * Last time the channel was used
- */
- struct GNUNET_TIME_Absolute timestamp;
-
- /**
- * Client owner of the tunnel, if any
- */
- struct MeshClient *root;
-
- /**
- * Client destination of the tunnel, if any.
- */
- struct MeshClient *dest;
-
- /**
- * Flag to signal the destruction of the channel.
- * If this is set GNUNET_YES the channel will be destroyed
- * when the queue is empty.
- */
- int destroy;
-
- /**
- * Total messages pending for this channel, payload or not.
- */
- unsigned int pending_messages;
-
- /**
- * Reliability data.
- * Only present (non-NULL) at the owner of a tunnel.
+ * Endpoint of the tunnel.
*/
- struct MeshChannelReliability *root_rel;
+ struct MeshPeer *peer;
/**
- * Reliability data.
- * Only present (non-NULL) at the destination of a tunnel.
+ * State of the tunnel.
*/
- struct MeshChannelReliability *dest_rel;
-
-};
-
+ enum MeshTunnelState state;
-/**
- * Struct containing all information regarding a connection to a peer.
- */
-struct MeshConnection
-{
/**
- * DLL
+ * Local peer ephemeral private key
*/
- struct MeshConnection *next;
- struct MeshConnection *prev;
+ struct GNUNET_CRYPTO_EccPrivateKey *my_eph_key;
/**
- * Tunnel this connection is part of.
+ * Local peer ephemeral public key
*/
- struct MeshTunnel2 *t;
+ struct GNUNET_CRYPTO_EccPublicSignKey *my_eph;
/**
- * Flow control information for traffic fwd.
+ * Remote peer's public key.
*/
- struct MeshFlowControl fwd_fc;
+ struct GNUNET_CRYPTO_EccPublicSignKey *peers_eph;
/**
- * Flow control information for traffic bck.
+ * Encryption ("our") key.
*/
- struct MeshFlowControl bck_fc;
+ struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
/**
- * ID of the connection.
+ * Decryption ("their") key.
*/
- struct GNUNET_HashCode id;
+ struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
/**
- * State of the connection.
+ * Paths that are actively used to reach the destination peer.
*/
- enum MeshConnectionState state;
+ struct MeshConnection *connection_head;
+ struct MeshConnection *connection_tail;
/**
- * Path being used for the tunnel.
+ * Next connection number.
*/
- struct MeshPeerPath *path;
+ uint32_t next_cid;
/**
- * Position of the local peer in the path.
+ * Channels inside this tunnel.
*/
- unsigned int own_pos;
+ struct MeshChannel *channel_head;
+ struct MeshChannel *channel_tail;
/**
- * Task to keep the used paths alive at the owner,
- * time tunnel out on all the other peers.
+ * Channel ID for the next created channel.
*/
- GNUNET_SCHEDULER_TaskIdentifier fwd_maintenance_task;
+ MESH_ChannelNumber next_chid;
/**
- * Task to keep the used paths alive at the destination,
- * time tunnel out on all the other peers.
+ * Channel ID for the next incoming channel.
*/
- GNUNET_SCHEDULER_TaskIdentifier bck_maintenance_task;
-
- /**
- * Pending message count.
- */
- int pending_messages;
-
- /**
- * Destroy flag: if true, destroy on last message.
- */
- int destroy;
-};
-
-
-/**
- * Struct used to queue messages in a tunnel.
- */
-struct MeshTunnelQueue
-{
- /**
- * DLL
- */
- struct MeshTunnelQueue *next;
- struct MeshTunnelQueue *prev;
-
- /**
- * Channel.
- */
- struct MeshChannel *ch;
-
- /**
- * Message to send.
- */
- /* struct GNUNET_MessageHeader *msg; */
-};
-
-
-/**
- * Struct containing all information regarding a tunnel to a peer.
- */
-struct MeshTunnel2
-{
- /**
- * Endpoint of the tunnel.
- */
- struct MeshPeer *peer;
-
- /**
- * State of the tunnel.
- */
- enum MeshTunnelState state;
-
- /**
- * Local peer ephemeral private key
- */
- struct GNUNET_CRYPTO_EccPrivateKey *my_eph_key;
-
- /**
- * Local peer ephemeral public key
- */
- struct GNUNET_CRYPTO_EccPublicSignKey *my_eph;
-
- /**
- * Remote peer's public key.
- */
- struct GNUNET_CRYPTO_EccPublicSignKey *peers_eph;
-
- /**
- * Encryption ("our") key.
- */
- struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
-
- /**
- * Decryption ("their") key.
- */
- struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
-
- /**
- * Paths that are actively used to reach the destination peer.
- */
- struct MeshConnection *connection_head;
- struct MeshConnection *connection_tail;
-
- /**
- * Next connection number.
- */
- uint32_t next_cid;
-
- /**
- * Channels inside this tunnel.
- */
- struct MeshChannel *channel_head;
- struct MeshChannel *channel_tail;
-
- /**
- * Channel ID for the next created channel.
- */
- MESH_ChannelNumber next_chid;
-
- /**
- * Channel ID for the next incoming channel.
- */
- MESH_ChannelNumber next_local_chid;
+ MESH_ChannelNumber next_local_chid;
/**
* Pending message count.
-/**
- * Struct containing information about a client of the service
- *
- * TODO: add a list of 'waiting' ports
- */
-struct MeshClient
-{
- /**
- * Linked list next
- */
- struct MeshClient *next;
-
- /**
- * Linked list prev
- */
- struct MeshClient *prev;
-
- /**
- * Tunnels that belong to this client, indexed by local id
- */
- struct GNUNET_CONTAINER_MultiHashMap32 *own_channels;
-
- /**
- * Tunnels this client has accepted, indexed by incoming local id
- */
- struct GNUNET_CONTAINER_MultiHashMap32 *incoming_channels;
-
- /**
- * Handle to communicate with the client
- */
- struct GNUNET_SERVER_Client *handle;
-
- /**
- * Ports that this client has declared interest in.
- * Indexed by port, contains *Client.
- */
- struct GNUNET_CONTAINER_MultiHashMap32 *ports;
-
- /**
- * Whether the client is active or shutting down (don't send confirmations
- * to a client that is shutting down.
- */
- int shutting_down;
-
- /**
- * ID of the client, mainly for debug messages
- */
- unsigned int id;
-};
-
-
/******************************************************************************/
/************************ DEBUG FUNCTIONS ****************************/
/******************************************************************************/
/************************** Configuration parameters **************************/
-/**
- * How often to send path keepalives. Paths timeout after 4 missed.
- */
-static struct GNUNET_TIME_Relative refresh_connection_time;
-
/**
* How often to PUT own ID in the DHT.
*/
*/
static unsigned long long dht_replication_level;
-/**
- * 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 many peers do we want to remember?
*/
/*************************** Static global variables **************************/
-/**
- * DLL with all the clients, head.
- */
-static struct MeshClient *clients_head;
-
-/**
- * DLL with all the clients, tail.
- */
-static struct MeshClient *clients_tail;
-
-/**
- * Connections known, indexed by cid (MeshConnection).
- */
-static struct GNUNET_CONTAINER_MultiHashMap *connections;
-
/**
* Peers known, indexed by PeerIdentity (MeshPeer).
*/
*/
static struct GNUNET_DHT_Handle *dht_handle;
-/**
- * Handle to server lib.
- */
-static struct GNUNET_SERVER_Handle *server_handle;
-
/**
* Handle to the statistics service.
*/
static struct GNUNET_STATISTICS_Handle *stats;
-/**
- * Notification context, to send messages to local clients.
- */
-static struct GNUNET_SERVER_NotificationContext *nc;
-
/**
* Local peer own ID (memory efficient handle).
*/
*/
static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key;
-/**
- * All ports clients of this peer have opened.
- */
-static struct GNUNET_CONTAINER_MultiHashMap32 *ports;
-
/**
* Task to periodically announce itself in the network.
*/
GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
-/**
- * Next ID to assign to a client.
- */
-unsigned int next_client_id;
-
/******************************************************************************/
/*********************** DECLARATIONS **************************/
path_add_to_peers (struct MeshPeerPath *p, int confirmed);
-/**
- * Search for a tunnel by global ID using full PeerIdentities.
- *
- * @param t Tunnel containing the channel.
- * @param chid Public channel number.
- *
- * @return channel handler, NULL if doesn't exist
- */
-static struct MeshChannel *
-channel_get (struct MeshTunnel2 *t, MESH_ChannelNumber chid);
-
-/**
- * Modify the data message ID from global to local and send to client.
- *
- * @param ch Channel on which to send the message.
- * @param msg Message to modify and send.
- * @param fwd Forward?
- */
-static void
-channel_send_client_data (struct MeshChannel *ch,
- const struct GNUNET_MESH_Data *msg,
- int fwd);
-
-
/**
* Change the tunnel state.
*
static void
tunnel_destroy (struct MeshTunnel2 *t);
-/**
- * Create a connection.
- *
- * @param cid Connection ID.
- */
-static struct MeshConnection *
-connection_new (const struct GNUNET_HashCode *cid);
-
-/**
- * Connection is no longer needed: destroy it and remove from tunnel.
- *
- * @param c Connection to destroy.
- */
-static void
-connection_destroy (struct MeshConnection *c);
-
-/**
- * Send FWD keepalive packets for a connection.
- *
- * @param cls Closure (connection for which to send the keepalive).
- * @param tc Notification context.
- */
-static void
-connection_fwd_keepalive (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc);
-
-/**
- * Send BCK keepalive packets for a connection.
- *
- * @param cls Closure (connection for which to send the keepalive).
- * @param tc Notification context.
- */
-static void
-connection_bck_keepalive (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc);
-
-
-/**
- * Change the tunnel state.
- *
- * @param c Connection whose state to change.
- * @param state New state.
- */
-static void
-connection_change_state (struct MeshConnection* c,
- enum MeshConnectionState state);
-
-
-
-/**
- * @brief Queue and pass message to core when possible.
- *
- * @param cls Closure (@c type dependant). It will be used by queue_send to
- * build the message to be sent if not already prebuilt.
- * @param type Type of the message, 0 for a raw message.
- * @param size Size of the message.
- * @param c Connection this message belongs to (cannot be NULL).
- * @param ch Channel this message belongs to, if applicable (otherwise NULL).
- * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
- */
-static void
-queue_add (void* cls,
- uint16_t type,
- size_t size,
- struct MeshConnection* c,
- struct MeshChannel* ch,
- int fwd);
-
-
-/**
- * Free a transmission that was already queued with all resources
- * associated to the request.
- *
- * @param queue Queue handler to cancel.
- * @param clear_cls Is it necessary to free associated cls?
- */
-static void
-queue_destroy (struct MeshPeerQueue *queue, int clear_cls);
-
-
-/**
- * Core callback to write a queued packet to core buffer
- *
- * @param cls Closure (peer info).
- * @param size Number of bytes available in buf.
- * @param buf Where the to write the message.
- *
- * @return number of bytes written to buf
- */
-static size_t
-queue_send (void *cls, size_t size, void *buf);
-
/**
* Demultiplex by message type and call appropriate handler for a message
}
-/**
- * Get the previous hop in a connection
- *
- * @param c Connection.
- *
- * @return Previous peer in the connection.
- */
-static struct MeshPeer *
-connection_get_prev_hop (struct MeshConnection *c)
-{
- GNUNET_PEER_Id id;
-
- if (0 == c->own_pos || c->path->length < 2)
- id = c->path->peers[0];
- else
- id = c->path->peers[c->own_pos - 1];
-
- return peer_get_short (id);
-}
-
/**
- * Get the next hop in a connection
+ * Count established (ready) connections of a tunnel.
*
- * @param c Connection.
+ * @param t Tunnel on which to send the message.
*
- * @return Next peer in the connection.
+ * @return Number of connections.
*/
-static struct MeshPeer *
-connection_get_next_hop (struct MeshConnection *c)
+static unsigned int
+tunnel_count_connections (struct MeshTunnel2 *t)
{
- GNUNET_PEER_Id id;
+ struct MeshConnection *c;
+ unsigned int i;
- 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];
+ for (c = t->connection_head, i = 0; NULL != c; c = c->next, i++);
- return peer_get_short (id);
+ return i;
}
/**
- * Get the hop in a connection.
+ * Pick a connection on which send the next data message.
*
- * @param c Connection.
- * @param fwd Next hop?
+ * @param t Tunnel on which to send the message.
+ * @param fwd Is this a fwd message?
*
- * @return Next peer in the connection.
+ * @return The connection on which to send the next message.
*/
-static struct MeshPeer *
-connection_get_hop (struct MeshConnection *c, int fwd)
+static struct MeshConnection *
+tunnel_get_connection (struct MeshTunnel2 *t, int fwd)
{
- if (fwd)
- return connection_get_next_hop (c);
- return connection_get_prev_hop (c);
-}
-
-/**
- * Check if client has registered with the service and has not disconnected
- *
- * @param client the client to check
- *
- * @return non-NULL if client exists in the global DLL
- */
-static struct MeshClient *
-client_get (struct GNUNET_SERVER_Client *client)
-{
- return GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
-}
-
-
-/**
- * Deletes a tunnel from a client (either owner or destination).
- *
- * @param c Client whose tunnel to delete.
- * @param ch Channel which should be deleted.
- */
-static void
-client_delete_channel (struct MeshClient *c, struct MeshChannel *ch)
-{
- int res;
-
- if (c == ch->root)
- {
- res = GNUNET_CONTAINER_multihashmap32_remove (c->own_channels,
- ch->lid_root, ch);
- if (GNUNET_YES != res)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_channel owner KO\n");
- }
- if (c == ch->dest)
- {
- res = GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels,
- ch->lid_dest, ch);
- if (GNUNET_YES != res)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_tunnel client KO\n");
- }
-}
-
-
-/**
- * Notify the appropriate client that a new incoming channel was created.
- *
- * @param ch Channel that was created.
- */
-static void
-send_local_channel_create (struct MeshChannel *ch)
-{
- struct GNUNET_MESH_ChannelMessage msg;
- struct MeshTunnel2 *t = ch->t;
-
- if (NULL == ch->dest)
- return;
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
- msg.channel_id = htonl (ch->lid_dest);
- msg.port = htonl (ch->port);
- msg.opt = 0;
- msg.opt |= GNUNET_YES == ch->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0;
- msg.opt |= GNUNET_YES == ch->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0;
- msg.opt = htonl (msg.opt);
- GNUNET_PEER_resolve (t->peer->id, &msg.peer);
- GNUNET_SERVER_notification_context_unicast (nc, ch->dest->handle,
- &msg.header, GNUNET_NO);
-}
-
-
-/**
- * Notify a client that the incoming tunnel is no longer valid.
- *
- * @param ch Channel that is destroyed.
- * @param fwd Forward notification (owner->dest)?
- */
-static void
-send_local_channel_destroy (struct MeshChannel *ch, int fwd)
-{
- struct GNUNET_MESH_ChannelMessage msg;
- struct MeshClient *c;
-
- c = fwd ? ch->dest : ch->root;
- if (NULL == c)
- {
- GNUNET_break (0);
- return;
- }
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
- msg.channel_id = htonl (fwd ? ch->lid_dest : ch->lid_root);
- msg.port = htonl (0);
- memset (&msg.peer, 0, sizeof (msg.peer));
- msg.opt = htonl (0);
- GNUNET_SERVER_notification_context_unicast (nc, c->handle,
- &msg.header, GNUNET_NO);
-}
-
-
-/**
- * Build a local ACK message and send it to a local client, if needed.
- *
- * If the client was already allowed to send data, do nothing.
- *
- * @param ch Channel on which to send the ACK.
- * @param c Client to whom send the ACK.
- * @param fwd Set to GNUNET_YES for FWD ACK (dest->root)
- */
-static void
-send_local_ack (struct MeshChannel *ch, int fwd)
-{
- struct GNUNET_MESH_LocalAck msg;
- struct MeshChannelReliability *rel;
- struct MeshClient *c;
-
- c = fwd ? ch->root : ch->dest;
- rel = fwd ? ch->root_rel : ch->dest_rel;
-
- if (GNUNET_YES == rel->client_ready)
- return; /* don't send double ACKs to client */
-
- rel->client_ready = GNUNET_YES;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "send local %s ack on %s:%X towards %p\n",
- fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid, c);
-
- if (NULL == c
- || ( fwd && (0 == ch->lid_root || c != ch->root))
- || (!fwd && (0 == ch->lid_dest || c != ch->dest)) )
- {
- GNUNET_break (0);
- return;
- }
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
- msg.channel_id = htonl (fwd ? ch->lid_root : ch->lid_dest);
- GNUNET_SERVER_notification_context_unicast (nc,
- c->handle,
- &msg.header,
- GNUNET_NO);
-
-}
-
-
-/**
- * Count established (ready) connections of a tunnel.
- *
- * @param t Tunnel on which to send the message.
- *
- * @return Number of connections.
- */
-static unsigned int
-tunnel_count_connections (struct MeshTunnel2 *t)
-{
- struct MeshConnection *c;
- unsigned int i;
-
- for (c = t->connection_head, i = 0; NULL != c; c = c->next, i++);
-
- return i;
-}
-
-
-/**
- * Pick a connection on which send the next data message.
- *
- * @param t Tunnel on which to send the message.
- * @param fwd Is this a fwd message?
- *
- * @return The connection on which to send the next message.
- */
-static struct MeshConnection *
-tunnel_get_connection (struct MeshTunnel2 *t, int fwd)
-{
- struct MeshConnection *c;
- struct MeshConnection *best;
- struct MeshFlowControl *fc;
- unsigned int lowest_q;
+ struct MeshConnection *c;
+ struct MeshConnection *best;
+ struct MeshFlowControl *fc;
+ unsigned int lowest_q;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n",
peer2s (t->peer));
}
-/**
- * Is this peer the first one on the connection?
- *
- * @param c Connection.
- * @param fwd Is this about fwd traffic?
- *
- * @return GNUNET_YES if origin, GNUNET_NO if relay/terminal.
- */
-static int
-connection_is_origin (struct MeshConnection *c, int fwd)
-{
- if (!fwd && c->path->length - 1 == c->own_pos )
- return GNUNET_YES;
- if (fwd && 0 == c->own_pos)
- return GNUNET_YES;
- return GNUNET_NO;
-}
-
-
-/**
- * Is this peer the last one on the connection?
- *
- * @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.
- */
-static int
-connection_is_terminal (struct MeshConnection *c, int fwd)
-{
- return connection_is_origin (c, !fwd);
-}
-
-
-/**
- * Is the root client for this channel on this peer?
- *
- * @param ch Channel.
- * @param fwd Is this for fwd traffic?
- *
- * @return GNUNET_YES in case it is.
- */
-static int
-channel_is_origin (struct MeshChannel *ch, int fwd)
-{
- struct MeshClient *c;
-
- c = fwd ? ch->root : ch->dest;
- return NULL != c;
-}
-
-
-/**
- * Is the destination client for this channel on this peer?
- *
- * @param ch Channel.
- * @param fwd Is this for fwd traffic?
- *
- * @return GNUNET_YES in case it is.
- */
-static int
-channel_is_terminal (struct MeshChannel *ch, int fwd)
-{
- struct MeshClient *c;
-
- c = fwd ? ch->dest : ch->root;
- return NULL != c;
-}
-
-
-/**
- * Get free buffer space towards the client on a specific channel.
- *
- * @param ch Channel.
- * @param fwd Is query about FWD traffic?
- *
- * @return Free buffer space [0 - 64]
- */
-static unsigned int
-channel_get_buffer (struct MeshChannel *ch, int fwd)
-{
- struct MeshChannelReliability *rel;
-
- rel = fwd ? ch->dest_rel : ch->root_rel;
-
- /* If rel is NULL it means that the end is not yet created,
- * most probably is a loopback channel at the point of sending
- * the ChannelCreate to itself.
- */
- if (NULL == rel)
- return 64;
-
- return (64 - rel->n_recv);
-}
-
-
-/**
- * Get free buffer space in a connection.
- *
- * @param c Connection.
- * @param fwd Is query about FWD traffic?
- *
- * @return Free buffer space [0 - max_msgs_queue/max_connections]
- */
-static unsigned int
-connection_get_buffer (struct MeshConnection *c, int fwd)
-{
- struct MeshFlowControl *fc;
-
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
-
- return (fc->queue_max - fc->queue_n);
-}
/**
buffer = 0;
/* If terminal, return biggest channel buffer */
- if (NULL == c || connection_is_terminal (c, fwd))
+ if (NULL == c || GMC_is_terminal (c, fwd))
{
struct MeshChannel *ch;
unsigned int ch_buf;
}
-/**
- * Sends an already built message on a connection, properly registering
- * all used resources.
- *
- * @param message Message to send. Function makes a copy of it.
- * If message is not hop-by-hop, decrements TTL of copy.
- * @param c Connection on which this message is transmitted.
- * @param ch Channel on which this message is transmitted, or NULL.
- * @param fwd Is this a fwd message?
- */
-static void
-send_prebuilt_message_connection (const struct GNUNET_MessageHeader *message,
- struct MeshConnection *c,
- struct MeshChannel *ch,
- int fwd)
-{
- void *data;
- size_t size;
- uint16_t type;
-
- size = ntohs (message->size);
- data = GNUNET_malloc (size);
- memcpy (data, message, size);
- type = ntohs (message->type);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send %s (%u) on connection %s\n",
- GNUNET_MESH_DEBUG_M2S (type), size, GNUNET_h2s (&c->id));
-
- switch (type)
- {
- struct GNUNET_MESH_Encrypted *emsg;
- struct GNUNET_MESH_ACK *amsg;
- struct GNUNET_MESH_Poll *pmsg;
- struct GNUNET_MESH_ConnectionDestroy *dmsg;
- struct GNUNET_MESH_ConnectionBroken *bmsg;
- uint32_t ttl;
-
- case GNUNET_MESSAGE_TYPE_MESH_FWD:
- case GNUNET_MESSAGE_TYPE_MESH_BCK:
- emsg = (struct GNUNET_MESH_Encrypted *) data;
- ttl = ntohl (emsg->ttl);
- if (0 == ttl)
- {
- GNUNET_break_op (0);
- return;
- }
- emsg->cid = c->id;
- emsg->ttl = htonl (ttl - 1);
- emsg->pid = htonl (fwd ? c->fwd_fc.next_pid++ : c->bck_fc.next_pid++);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " pid %u\n", ntohl (emsg->pid));
- break;
-
- case GNUNET_MESSAGE_TYPE_MESH_ACK:
- amsg = (struct GNUNET_MESH_ACK *) data;
- amsg->cid = c->id;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ntohl (amsg->ack));
- break;
-
- case GNUNET_MESSAGE_TYPE_MESH_POLL:
- pmsg = (struct GNUNET_MESH_Poll *) data;
- pmsg->cid = c->id;
- pmsg->pid = htonl (fwd ? c->fwd_fc.last_pid_sent : c->bck_fc.last_pid_sent);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " poll %u\n", ntohl (pmsg->pid));
- break;
-
- case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
- dmsg = (struct GNUNET_MESH_ConnectionDestroy *) data;
- dmsg->cid = c->id;
- dmsg->reserved = 0;
- break;
-
- case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
- bmsg = (struct GNUNET_MESH_ConnectionBroken *) data;
- bmsg->cid = c->id;
- bmsg->reserved = 0;
- break;
-
- case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
- case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
- break;
-
- default:
- GNUNET_break (0);
- }
-
- queue_add (data,
- type,
- size,
- c,
- ch,
- fwd);
-}
-
-
/**
* Sends an already built message on a tunnel, choosing the best connection.
*
}
-/**
- * Sends an already built message on a channel, properly registering
- * all used resources and encrypting the message with the tunnel's key.
- *
- * @param message Message to send. Function makes a copy of it.
- * @param ch Channel on which this message is transmitted.
- * @param fwd Is this a fwd message?
- */
-static void
-send_prebuilt_message_channel (const struct GNUNET_MessageHeader *message,
- struct MeshChannel *ch,
- int fwd)
-{
- struct GNUNET_MESH_Encrypted *msg;
- size_t size = ntohs (message->size);
- char *cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
- uint16_t type;
- uint64_t iv;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Channel %s:%X %s\n",
- peer2s (ch->t->peer), ch->gid, fwd ? "FWD" : "BCK");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %s\n",
- GNUNET_MESH_DEBUG_M2S (ntohs (message->type)));
-
- if (channel_is_terminal (ch, fwd) || ch->t->peer->id == myid)
- {
- handle_decrypted (ch->t, message, fwd);
- return;
- }
-
- type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD : GNUNET_MESSAGE_TYPE_MESH_BCK;
- iv = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_NONCE, UINT64_MAX);
-
- msg = (struct GNUNET_MESH_Encrypted *) cbuf;
- msg->header.type = htons (type);
- msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size);
- msg->iv = GNUNET_htonll (iv);
- tunnel_encrypt (ch->t, &msg[1], message, size, iv, fwd);
- send_prebuilt_message_tunnel (msg, ch->t, ch, fwd);
-}
-
/**
* Sends a CREATE CONNECTION message for a path to a peer.
return best_p;
}
-static int
-queue_is_sendable (struct MeshPeerQueue *q)
-{
- struct MeshFlowControl *fc;
-
- /* Is PID-independent? */
- switch (q->type)
- {
- case GNUNET_MESSAGE_TYPE_MESH_ACK:
- case GNUNET_MESSAGE_TYPE_MESH_POLL:
- return GNUNET_YES;
- }
-
- /* Is PID allowed? */
- fc = q->fwd ? &q->c->fwd_fc : &q->c->bck_fc;
- if (GMC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
- return GNUNET_YES;
-
- return GNUNET_NO;
-}
/**
- * Get first sendable message.
- *
- * @param peer The destination peer.
+ * Try to establish a new connection to this peer in the given tunnel.
+ * If the peer doesn't have any path to it yet, try to get one.
+ * If the peer already has some path, send a CREATE CONNECTION towards it.
*
- * @return Best current known path towards the peer, if any.
+ * @param peer PeerInfo of the peer.
*/
-static struct MeshPeerQueue *
-peer_get_first_message (const struct MeshPeer *peer)
-{
- struct MeshPeerQueue *q;
-
- for (q = peer->queue_head; NULL != q; q = q->next)
- {
- if (queue_is_sendable (q))
- return q;
- }
-
- return NULL;
-}
-
-
-/**
- * Try to establish a new connection to this peer in the given tunnel.
- * If the peer doesn't have any path to it yet, try to get one.
- * If the peer already has some path, send a CREATE CONNECTION towards it.
- *
- * @param peer PeerInfo of the peer.
- */
-static void
-peer_connect (struct MeshPeer *peer)
+static void
+peer_connect (struct MeshPeer *peer)
{
struct MeshTunnel2 *t;
struct MeshPeerPath *p;
}
-/**
- * Get the first transmittable message for a connection.
- *
- * @param c Connection.
- * @param fwd Is this FWD?
- *
- * @return First transmittable message.
- */
-static struct MeshPeerQueue *
-connection_get_first_message (struct MeshConnection *c, int fwd)
-{
- struct MeshPeerQueue *q;
- struct MeshPeer *p;
-
- p = connection_get_hop (c, fwd);
-
- for (q = p->queue_head; NULL != q; q = q->next)
- {
- if (q->c != c)
- continue;
- if (queue_is_sendable (q))
- return q;
- }
-
- return NULL;
-}
-
-
-/**
- * @brief Re-initiate traffic on this connection if necessary.
- *
- * Check if there is traffic queued towards this peer
- * and the core transmit handle is NULL (traffic was stalled).
- * If so, call core tmt rdy.
- *
- * @param c Connection on which initiate traffic.
- * @param fwd Is this about fwd traffic?
- */
-static void
-connection_unlock_queue (struct MeshConnection *c, int fwd)
-{
- struct MeshPeer *peer;
- struct MeshPeerQueue *q;
- size_t size;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "connection_unlock_queue %s on %s\n",
- fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id));
-
- if (connection_is_terminal (c, fwd))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " is terminal!\n");
- return;
- }
-
- peer = connection_get_hop (c, fwd);
-
- if (NULL != peer->core_transmit)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
- return; /* Already unlocked */
- }
-
- q = connection_get_first_message (c, fwd);
- if (NULL == q)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
- return; /* Nothing to transmit */
- }
-
- size = q->size;
- peer->core_transmit =
- GNUNET_CORE_notify_transmit_ready (core_handle,
- GNUNET_NO,
- 0,
- GNUNET_TIME_UNIT_FOREVER_REL,
- GNUNET_PEER_resolve2 (peer->id),
- size,
- &queue_send,
- peer);
-}
-
-
-/**
- * Cancel all transmissions that belong to a certain connection.
- *
- * @param c Connection which to cancel.
- * @param fwd Cancel fwd traffic?
- */
-static void
-connection_cancel_queues (struct MeshConnection *c, int fwd)
-{
- struct MeshPeerQueue *q;
- struct MeshPeerQueue *next;
- struct MeshFlowControl *fc;
- struct MeshPeer *peer;
-
- if (NULL == c)
- {
- GNUNET_break (0);
- return;
- }
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
- peer = connection_get_hop (c, fwd);
-
- for (q = peer->queue_head; NULL != q; q = next)
- {
- next = q->next;
- if (q->c == c)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "connection_cancel_queue %s\n",
- GNUNET_MESH_DEBUG_M2S (q->type));
- queue_destroy (q, GNUNET_YES);
- }
- }
- if (NULL == peer->queue_head)
- {
- if (NULL != peer->core_transmit)
- {
- GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
- peer->core_transmit = NULL;
- }
- if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
- {
- GNUNET_SCHEDULER_cancel (fc->poll_task);
- fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
- }
- }
-}
-
/**
* Add the path to the peer and update the path used to reach it in case this
peer_add_path (peer_info, path, trusted);
}
-
-
-/**
- * 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).
- * @param tc TaskContext.
- */
-static void
-connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct MeshFlowControl *fc = cls;
- struct GNUNET_MESH_Poll msg;
- struct MeshConnection *c;
-
- fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- {
- return;
- }
-
- c = fc->c;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** connection [%X]\n",
- GNUNET_h2s (&c->id));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** %s\n",
- fc == &c->fwd_fc ? "FWD" : "BCK");
-
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
- msg.header.size = htons (sizeof (msg));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** pid (%u)!\n", fc->last_pid_sent);
- send_prebuilt_message_connection (&msg.header, c, NULL, fc == &c->fwd_fc);
- fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
- fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
- &connection_poll, fc);
-}
-
-
/**
* Build a PeerPath from the paths returned from the DHT, reversing the paths
* to obtain a local peer -> destination path and interning the peer ids.
}
-/**
- * Search for a channel among the channels for a client
- *
- * @param c the client whose channels to search in
- * @param chid the local id of the channel
- *
- * @return channel handler, NULL if doesn't exist
- */
-static struct MeshChannel *
-channel_get_by_local_id (struct MeshClient *c, MESH_ChannelNumber chid)
-{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " -- get CHID %X\n", chid);
- if (0 == (chid & GNUNET_MESH_LOCAL_CHANNEL_ID_CLI))
- {
- GNUNET_break_op (0);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CHID %X not a local chid\n", chid);
- return NULL;
- }
- if (chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
- return GNUNET_CONTAINER_multihashmap32_get (c->incoming_channels, chid);
- return GNUNET_CONTAINER_multihashmap32_get (c->own_channels, chid);
-}
-
-
-static void
-channel_debug (struct MeshChannel *ch)
-{
- if (NULL == ch)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CHANNEL ***\n");
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Channel %s:%X (%p)\n",
- peer2s (ch->t->peer), ch->gid, ch);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " root %p/%p\n",
- ch->root, ch->root_rel);
- if (NULL != ch->root)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " cli %u\n", ch->root->id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ready %s\n",
- ch->root_rel->client_ready ? "YES" : "NO");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " id %X\n", ch->lid_root);
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " dest %p/%p\n",
- ch->dest, ch->dest_rel);
- if (NULL != ch->dest)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " cli %u\n", ch->dest->id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ready %s\n",
- ch->dest_rel->client_ready ? "YES" : "NO");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " id %X\n", ch->lid_dest);
- }
-}
-
#if 0
static void
fc_debug (struct MeshFlowControl *fc)
#endif
-static struct MeshChannel *
-channel_get (struct MeshTunnel2 *t, MESH_ChannelNumber chid)
-{
- struct MeshChannel *ch;
-
- if (NULL == t)
- return NULL;
-
- for (ch = t->channel_head; NULL != ch; ch = ch->next)
- {
- if (ch->gid == chid)
- break;
- }
-
- return ch;
-}
-
/**
* Change the tunnel state.
}
-static void
-connection_change_state (struct MeshConnection* c,
- enum MeshConnectionState state)
-{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Connection %s state was %s\n",
- GNUNET_h2s (&c->id), GNUNET_MESH_DEBUG_CS2S (c->state));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Connection %s state is now %s\n",
- GNUNET_h2s (&c->id), GNUNET_MESH_DEBUG_CS2S (state));
- c->state = state;
-}
-
-
-/**
- * Add a client to a channel, initializing all needed data structures.
- *
- * @param ch Channel to which add the client.
- * @param c Client which to add to the channel.
- */
-static void
-channel_add_client (struct MeshChannel *ch, struct MeshClient *c)
-{
- struct MeshTunnel2 *t = ch->t;
-
- if (NULL != ch->dest)
- {
- GNUNET_break (0);
- return;
- }
-
- /* Assign local id as destination */
- while (NULL != channel_get_by_local_id (c, t->next_local_chid))
- t->next_local_chid = (t->next_local_chid + 1) | GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
- ch->lid_dest = t->next_local_chid++;
- t->next_local_chid = t->next_local_chid | GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
-
- /* Store in client's hashmap */
- if (GNUNET_OK !=
- GNUNET_CONTAINER_multihashmap32_put (c->incoming_channels,
- ch->lid_dest, ch,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
- {
- GNUNET_break (0);
- return;
- }
-
- GNUNET_break (NULL == ch->dest_rel);
- ch->dest_rel = GNUNET_new (struct MeshChannelReliability);
- ch->dest_rel->ch = ch;
- ch->dest_rel->expected_delay = MESH_RETRANSMIT_TIME;
- ch->dest = c;
-}
static struct MeshConnection *
}
+
+
/**
- * Send an end-to-end ACK message for the most recent in-sequence payload.
- *
- * If channel is not reliable, do nothing.
+ * Send an ACK on the appropriate connection/channel, depending on
+ * the direction and the position of the peer.
*
- * @param ch Channel this is about.
- * @param fwd Is for FWD traffic? (ACK dest->owner)
+ * @param c Which connection to send the hop-by-hop ACK.
+ * @param ch Channel, if any.
+ * @param fwd Is this a fwd ACK? (will go dest->root)
*/
static void
-channel_send_data_ack (struct MeshChannel *ch, int fwd)
+send_ack (struct MeshConnection *c, struct MeshChannel *ch, int fwd)
{
- struct GNUNET_MESH_DataACK msg;
- struct MeshChannelReliability *rel;
- struct MeshReliableMessage *copy;
- unsigned int delta;
- uint64_t mask;
- uint16_t type;
+ unsigned int buffer;
- if (GNUNET_NO == ch->reliable)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "send ack %s on %p %p\n",
+ fwd ? "FWD" : "BCK", c, ch);
+ if (NULL == c || GMC_is_terminal (c, fwd))
{
- return;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " getting from all connections\n");
+ buffer = tunnel_get_buffer (NULL == c ? ch->t : c->t, fwd);
}
- rel = fwd ? ch->dest_rel : ch->root_rel;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "send_data_ack for %u\n",
- rel->mid_recv - 1);
-
- type = GNUNET_MESSAGE_TYPE_MESH_DATA_ACK;
- msg.header.type = htons (type);
- msg.header.size = htons (sizeof (msg));
- msg.chid = htonl (ch->gid);
- msg.mid = htonl (rel->mid_recv - 1);
- msg.futures = 0;
- for (copy = rel->head_recv; NULL != copy; copy = copy->next)
+ else
{
- if (copy->type != type)
- continue;
- delta = copy->mid - rel->mid_recv;
- if (63 < delta)
- break;
- mask = 0x1LL << delta;
- msg.futures |= mask;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " setting bit for %u (delta %u) (%llX) -> %llX\n",
- copy->mid, delta, mask, msg.futures);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " getting from one connection\n");
+ buffer = connection_get_buffer (c, fwd);
}
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " final futures %llX\n", msg.futures);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
- send_prebuilt_message_channel (&msg.header, ch, fwd);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n");
+ if ( (NULL != ch && channel_is_origin (ch, fwd)) ||
+ (NULL != c && connection_is_origin (c, fwd)) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
+ if (0 < buffer)
+ {
+ GNUNET_assert (NULL != ch);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " really sending!\n");
+ send_local_ack (ch, fwd);
+ }
+ }
+ else if (NULL == c)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on all connections\n");
+ GNUNET_assert (NULL != ch);
+ channel_send_connections_ack (ch, buffer, fwd);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
+ connection_send_ack (c, buffer, fwd);
+ }
}
+
+
/**
- * Send an ACK informing the predecessor about the available buffer space.
- *
- * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
- * the ACK itself goes "back" (dest->root).
+ * Confirm we got a channel create.
*
- * @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->owner)
+ * @param ch The channel to confirm.
+ * @param fwd Should we send the ACK fwd?
*/
static void
-connection_send_ack (struct MeshConnection *c, unsigned int buffer, int fwd)
+channel_send_ack (struct MeshChannel *ch, int fwd)
{
- struct MeshFlowControl *next_fc;
- struct MeshFlowControl *prev_fc;
- struct GNUNET_MESH_ACK msg;
- uint32_t ack;
- int delta;
-
- next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
- prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "connection send %s ack on %s\n",
- fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id));
-
- /* Check if we need to transmit the ACK */
- if (prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " last pid recv: %u, last ack sent: %u\n",
- prev_fc->last_pid_recv, prev_fc->last_ack_sent);
- return;
- }
-
- /* Ok, ACK might be necessary, what PID to ACK? */
- delta = next_fc->queue_max - next_fc->queue_n;
- ack = prev_fc->last_pid_recv + delta;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
- GNUNET_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_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
- return;
- }
-
- prev_fc->last_ack_sent = ack;
+ struct GNUNET_MESH_ChannelManage msg;
- /* Build ACK message and send on connection */
msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
- msg.ack = htonl (ack);
- msg.cid = c->id;
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " sending channel %s ack for channel %s:%X\n",
+ fwd ? "FWD" : "BCK", peer2s (ch->t->peer),
+ ch->gid);
- send_prebuilt_message_connection (&msg.header, c, NULL, !fwd);
+ msg.chid = htonl (ch->gid);
+ send_prebuilt_message_channel (&msg.header, ch, !fwd);
}
/**
- * Modify the mesh message TID from global to local and send to client.
- *
- * @param ch Channel on which to send the message.
- * @param msg Message to modify and send.
- * @param c Client to send to.
- * @param tid Tunnel ID to use (c can be both owner and client).
+ * Send a message to all clients (local and remote) of this channel
+ * notifying that the channel is no longer valid.
+ *
+ * If some peer or client should not receive the message,
+ * should be zero'ed out before calling this function.
+ *
+ * @param ch The channel whose clients to notify.
*/
static void
-channel_send_client_to_tid (struct MeshChannel *ch,
- const struct GNUNET_MESH_Data *msg,
- struct MeshClient *c, MESH_ChannelNumber id)
+channel_send_destroy (struct MeshChannel *ch)
{
- struct GNUNET_MESH_LocalData *copy;
- uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
- char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
+ struct GNUNET_MESH_ChannelManage msg;
+
+ msg.header.size = htons (sizeof (msg));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " sending channel destroy for channel %s:%X\n",
+ peer2s (ch->t->peer),
+ ch->gid);
- if (size < sizeof (struct GNUNET_MessageHeader))
+ if (channel_is_terminal (ch, GNUNET_NO))
{
- GNUNET_break_op (0);
- return;
+ if (NULL != ch->root && GNUNET_NO == ch->root->shutting_down)
+ {
+ msg.chid = htonl (ch->lid_root);
+ send_local_channel_destroy (ch, GNUNET_NO);
+ }
}
- if (NULL == c)
+ else
{
- GNUNET_break (0);
- return;
+ msg.chid = htonl (ch->gid);
+ send_prebuilt_message_channel (&msg.header, ch, GNUNET_NO);
}
- copy = (struct GNUNET_MESH_LocalData *) cbuf;
- memcpy (©[1], &msg[1], size);
- copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
- copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
- copy->id = htonl (id);
- GNUNET_SERVER_notification_context_unicast (nc, c->handle,
- ©->header, GNUNET_NO);
-}
-
-/**
- * We have received a message out of order, or the client is not ready.
- * Buffer it until we receive an ACK from the client or the missing
- * message from the channel.
- *
- * @param msg Message to buffer (MUST be of type MESH_DATA).
- * @param rel Reliability data to the corresponding direction.
- */
-static void
-channel_rel_add_buffered_data (const struct GNUNET_MESH_Data *msg,
- struct MeshChannelReliability *rel)
-{
- struct MeshReliableMessage *copy;
- struct MeshReliableMessage *prev;
- uint32_t mid;
- uint16_t size;
-
- size = ntohs (msg->header.size);
- mid = ntohl (msg->mid);
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data %u\n", mid);
-
- copy = GNUNET_malloc (sizeof (*copy) + size);
- copy->mid = mid;
- copy->rel = rel;
- memcpy (©[1], msg, size);
-
- rel->n_recv++;
-
- // FIXME do something better than O(n), although n < 64...
- // FIXME start from the end (most messages are the latest ones)
- for (prev = rel->head_recv; NULL != prev; prev = prev->next)
+ if (channel_is_terminal (ch, GNUNET_YES))
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid);
- if (GMC_is_pid_bigger (prev->mid, mid))
+ if (NULL != ch->dest && GNUNET_NO == ch->dest->shutting_down)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n");
- GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv,
- prev, copy);
- return;
+ msg.chid = htonl (ch->lid_dest);
+ send_local_channel_destroy (ch, GNUNET_YES);
}
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " insert at tail!\n");
- GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n");
-}
-
-
-static void
-channel_send_client_data (struct MeshChannel *ch,
- const struct GNUNET_MESH_Data *msg,
- int fwd)
-{
- if (fwd)
- {
- if (ch->dest_rel->client_ready)
- channel_send_client_to_tid (ch, msg, ch->dest, ch->lid_dest);
- else
- channel_rel_add_buffered_data (msg, ch->dest_rel);
}
else
{
- if (ch->root_rel->client_ready)
- channel_send_client_to_tid (ch, msg, ch->root, ch->lid_root);
- else
- channel_rel_add_buffered_data (msg, ch->root_rel);
+ msg.chid = htonl (ch->gid);
+ send_prebuilt_message_channel (&msg.header, ch, GNUNET_YES);
}
}
/**
- * Send a buffered message to the client, for in order delivery or
- * as result of client ACK.
- *
- * @param ch Channel on which to empty the message buffer.
- * @param c Client to send to.
- * @param rel Reliability structure to corresponding peer.
- * If rel == bck_rel, this is FWD data.
+ * Create a tunnel.
*/
-static void
-channel_send_client_buffered_data (struct MeshChannel *ch,
- struct MeshClient *c,
- int fwd)
+static struct MeshTunnel2 *
+tunnel_new (void)
{
- struct MeshReliableMessage *copy;
- struct MeshChannelReliability *rel;
+ struct MeshTunnel2 *t;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n");
- rel = fwd ? ch->dest_rel : ch->root_rel;
- if (GNUNET_NO == rel->client_ready)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client not ready\n");
- return;
- }
+ t = GNUNET_new (struct MeshTunnel2);
+ t->next_chid = 0;
+ t->next_local_chid = GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
+// if (GNUNET_OK !=
+// GNUNET_CONTAINER_multihashmap_put (tunnels, tid, t,
+// GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
+// {
+// GNUNET_break (0);
+// tunnel_destroy (t);
+// return NULL;
+// }
- copy = rel->head_recv;
- /* We never buffer channel management messages */
- if (NULL != copy)
- {
- if (copy->mid == rel->mid_recv || GNUNET_NO == ch->reliable)
- {
- struct GNUNET_MESH_Data *msg = (struct GNUNET_MESH_Data *) ©[1];
+// char salt[] = "salt";
+// GNUNET_CRYPTO_kdf (&t->e_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
+// salt, sizeof (salt),
+// &t->e_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
+// &my_full_id, sizeof (struct GNUNET_PeerIdentity),
+// GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
+// NULL);
+// GNUNET_CRYPTO_kdf (&t->d_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
+// salt, sizeof (salt),
+// &t->d_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
+// GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
+// &my_full_id, sizeof (struct GNUNET_PeerIdentity),
+// NULL);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " have %u! now expecting %u\n",
- copy->mid, rel->mid_recv + 1);
- channel_send_client_data (ch, msg, fwd);
- rel->n_recv--;
- rel->mid_recv++;
- GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
- GNUNET_free (copy);
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " reliable && don't have %u, next is %u\n",
- rel->mid_recv,
- copy->mid);
- return;
- }
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n");
+ return t;
}
/**
- * Destroy a reliable message after it has been acknowledged, either by
- * direct mid ACK or bitfield. Updates the appropriate data structures and
- * timers and frees all memory.
- *
- * @param copy Message that is no longer needed: remote peer got it.
+ * Add a connection to a tunnel.
+ *
+ * @param t Tunnel.
+ * @param c Connection.
*/
static void
-rel_message_free (struct MeshReliableMessage *copy)
+tunnel_add_connection (struct MeshTunnel2 *t, struct MeshConnection *c)
{
- struct MeshChannelReliability *rel;
- struct GNUNET_TIME_Relative time;
-
- rel = copy->rel;
- time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
- rel->expected_delay.rel_value_us *= 7;
- rel->expected_delay.rel_value_us += time.rel_value_us;
- rel->expected_delay.rel_value_us /= 8;
- rel->n_sent--;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Freeing %u\n", copy->mid);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! took %s\n",
- GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
- GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
- GNUNET_NO));
- rel->retry_timer = rel->expected_delay;
- GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
- GNUNET_free (copy);
+ struct MeshConnection *aux;
+ c->t = t;
+ for (aux = t->connection_head; aux != NULL; aux = aux->next)
+ if (aux == c)
+ return;
+ GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, c);
}
-/**
- * Destroy all reliable messages queued for a channel,
- * during a channel destruction.
- * Frees the reliability structure itself.
- *
- * @param rel Reliability data for a channel.
- */
+
static void
-channel_rel_free_all (struct MeshChannelReliability *rel)
+tunnel_destroy (struct MeshTunnel2 *t)
{
- struct MeshReliableMessage *copy;
- struct MeshReliableMessage *next;
+ struct MeshConnection *c;
+ struct MeshConnection *next;
- if (NULL == rel)
+ if (NULL == t)
return;
- for (copy = rel->head_recv; NULL != copy; copy = next)
- {
- next = copy->next;
- GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
- GNUNET_free (copy);
- }
- for (copy = rel->head_sent; NULL != copy; copy = next)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n",
+ peer2s (t->peer));
+
+// if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t))
+// GNUNET_break (0);
+
+ for (c = t->connection_head; NULL != c; c = next)
{
- next = copy->next;
- GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
- GNUNET_free (copy);
+ next = c->next;
+ connection_destroy (c);
}
- if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
- GNUNET_SCHEDULER_cancel (rel->retry_task);
- GNUNET_free (rel);
+
+ GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
+ t->peer->tunnel = NULL;
+
+ GNUNET_free (t);
}
/**
- * Mark future messages as ACK'd.
+ * Tunnel is empty: destroy it.
+ *
+ * Notifies all connections about the destruction.
*
- * @param rel Reliability data.
- * @param msg DataACK message with a bitfield of future ACK'd messages.
+ * @param t Tunnel to destroy.
*/
static void
-channel_rel_free_sent (struct MeshChannelReliability *rel,
- const struct GNUNET_MESH_DataACK *msg)
+tunnel_destroy_empty (struct MeshTunnel2 *t)
{
- struct MeshReliableMessage *copy;
- struct MeshReliableMessage *next;
- uint64_t bitfield;
- uint64_t mask;
- uint32_t mid;
- uint32_t target;
- unsigned int i;
+ struct MeshConnection *c;
- bitfield = msg->futures;
- mid = ntohl (msg->mid);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "free_sent_reliable %u %llX\n",
- mid, bitfield);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " rel %p, head %p\n",
- rel, rel->head_sent);
- for (i = 0, copy = rel->head_sent;
- i < 64 && NULL != copy && 0 != bitfield;
- i++)
+ for (c = t->connection_head; NULL != c; c = c->next)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " trying bit %u (mid %u)\n",
- i, mid + i + 1);
- mask = 0x1LL << i;
- if (0 == (bitfield & mask))
- continue;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " set!\n");
- /* Bit was set, clear the bit from the bitfield */
- bitfield &= ~mask;
-
- /* The i-th bit was set. Do we have that copy? */
- /* Skip copies with mid < target */
- target = mid + i + 1;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target);
- while (NULL != copy && GMC_is_pid_bigger (target, copy->mid))
- copy = copy->next;
-
- /* Did we run out of copies? (previously freed, it's ok) */
- if (NULL == copy)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n");
- return;
- }
-
- /* Did we overshoot the target? (previously freed, it's ok) */
- if (GMC_is_pid_bigger (copy->mid, target))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid);
- continue;
- }
-
- /* Now copy->mid == target, free it */
- next = copy->next;
- rel_message_free (copy);
- copy = next;
+ if (GNUNET_NO == c->destroy)
+ connection_send_destroy (c);
}
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n");
+
+ if (0 == t->pending_messages)
+ tunnel_destroy (t);
+ else
+ t->destroy = GNUNET_YES;
}
/**
- * We haven't received an ACK after a certain time: restransmit the message.
+ * Destroy tunnel if empty (no more channels).
*
- * @param cls Closure (MeshReliableMessage with the message to restransmit)
- * @param tc TaskContext.
+ * @param t Tunnel to destroy if empty.
*/
static void
-channel_retransmit_message (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+tunnel_destroy_if_empty (struct MeshTunnel2 *t)
{
- struct MeshChannelReliability *rel = cls;
- struct MeshReliableMessage *copy;
- struct MeshPeerQueue *q;
- struct MeshChannel *ch;
- struct MeshConnection *c;
- struct GNUNET_MESH_Data *payload;
- struct MeshPeer *hop;
- int fwd;
-
- rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ if (NULL != t->channel_head)
return;
- ch = rel->ch;
- copy = rel->head_sent;
- if (NULL == copy)
- {
- GNUNET_break (0);
- return;
- }
+ tunnel_destroy_empty (t);
+}
+
+
+/******************************************************************************/
+/**************** MESH NETWORK HANDLER HELPERS ***********************/
+/******************************************************************************/
- /* Search the message to be retransmitted in the outgoing queue.
- * Check only the queue for the connection that is going to be used,
- * if the message is stuck in some other connection's queue we shouldn't
- * act upon it:
- * - cancelling it and sending the new one doesn't guarantee it's delivery,
- * the old connection could be temporary stalled or the queue happened to
- * be long at time of insertion.
- * - not sending the new one could cause terrible delays the old connection
- * is stalled.
- */
- payload = (struct GNUNET_MESH_Data *) ©[1];
- fwd = (rel == ch->root_rel);
- c = tunnel_get_connection (ch->t, fwd);
- hop = connection_get_hop (c, fwd);
- for (q = hop->queue_head; NULL != q; q = q->next)
- {
- if (ntohs (payload->header.type) == q->type && ch == q->ch)
- {
- struct GNUNET_MESH_Data *queued_data = q->cls;
- if (queued_data->mid == payload->mid)
- break;
- }
- }
- /* Message not found in the queue that we are going to use. */
- if (NULL == q)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->mid);
- send_prebuilt_message_channel (&payload->header, ch, fwd);
- GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ALREADY IN QUEUE %u\n", copy->mid);
- }
- rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
- rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
- &channel_retransmit_message,
- cls);
-}
+
+/******************************************************************************/
+/******************** MESH NETWORK HANDLERS **************************/
+/******************************************************************************/
/**
- * Send ACK on one or more connections due to buffer space to the client.
- *
- * Iterates all connections of the tunnel and sends ACKs appropriately.
+ * Generic handler for mesh network payload traffic.
*
- * @param ch Channel which has some free buffer space.
- * @param fwd Is this in for FWD traffic? (ACK goes dest->root)
+ * @param t Tunnel on which we got this message.
+ * @param message Unencryted data message.
+ * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
*/
static void
-channel_send_connections_ack (struct MeshChannel *ch,
- unsigned int buffer,
- int fwd)
+handle_data (struct MeshTunnel2 *t, const struct GNUNET_MESH_Data *msg, int fwd)
{
- struct MeshTunnel2 *t = ch->t;
- struct MeshConnection *c;
- struct MeshFlowControl *fc;
- uint32_t allowed;
- uint32_t to_allow;
- uint32_t allow_per_connection;
- unsigned int cs;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Channel send connection %s ack on %s:%X\n",
- fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid);
+ struct MeshChannelReliability *rel;
+ struct MeshChannel *ch;
+ struct MeshClient *c;
+ uint32_t mid;
+ uint16_t type;
+ size_t size;
- /* Count connections, how many messages are already allowed */
- for (cs = 0, allowed = 0, c = t->connection_head; NULL != c; c = c->next)
+ /* Check size */
+ size = ntohs (msg->header.size);
+ if (size <
+ sizeof (struct GNUNET_MESH_Data) +
+ sizeof (struct GNUNET_MessageHeader))
{
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
- if (GMC_is_pid_bigger(fc->last_pid_recv, fc->last_ack_sent))
- {
- GNUNET_break (0);
- continue;
- }
- allowed += fc->last_ack_sent - fc->last_pid_recv;
- cs++;
+ GNUNET_break (0);
+ return;
}
+ type = ntohs (msg->header.type);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message\n",
+ GNUNET_MESH_DEBUG_M2S (type));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
+ GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
- /* Make sure there is no overflow */
- if (allowed > buffer)
+ /* Check channel */
+ ch = channel_get (t, ntohl (msg->chid));
+ if (NULL == ch)
{
- GNUNET_break (0);
+ GNUNET_STATISTICS_update (stats, "# data on unknown channel", 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
+ ntohl (msg->chid));
return;
}
- /* Authorize connections to send more data */
- to_allow = buffer - allowed;
+ /* Initialize FWD/BCK data */
+ c = fwd ? ch->dest : ch->root;
+ rel = fwd ? ch->dest_rel : ch->root_rel;
- for (c = t->connection_head; NULL != c && to_allow > 0; c = c->next)
+ if (NULL == c)
{
- allow_per_connection = to_allow/cs;
- to_allow -= allow_per_connection;
- cs--;
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
- if (fc->last_ack_sent - fc->last_pid_recv > 64 / 3)
- {
- continue;
- }
- connection_send_ack (c, allow_per_connection, fwd);
+ GNUNET_break (0);
+ return;
}
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Channel send connection %s ack on %s:%X\n",
- fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid);
- GNUNET_break (to_allow == 0);
-}
-
+ tunnel_change_state (t, MESH_TUNNEL_READY);
-/**
- * Send an ACK on the appropriate connection/channel, depending on
- * the direction and the position of the peer.
- *
- * @param c Which connection to send the hop-by-hop ACK.
- * @param ch Channel, if any.
- * @param fwd Is this a fwd ACK? (will go dest->root)
- */
-static void
-send_ack (struct MeshConnection *c, struct MeshChannel *ch, int fwd)
-{
- unsigned int buffer;
+ GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "send ack %s on %p %p\n",
- fwd ? "FWD" : "BCK", c, ch);
- if (NULL == c || connection_is_terminal (c, fwd))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " getting from all connections\n");
- buffer = tunnel_get_buffer (NULL == c ? ch->t : c->t, fwd);
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " getting from one connection\n");
- buffer = connection_get_buffer (c, fwd);
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
+ mid = ntohl (msg->mid);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " mid %u\n", mid);
- if ( (NULL != ch && channel_is_origin (ch, fwd)) ||
- (NULL != c && connection_is_origin (c, fwd)) )
+ if (GNUNET_NO == ch->reliable ||
+ ( !GMC_is_pid_bigger (rel->mid_recv, mid) &&
+ GMC_is_pid_bigger (rel->mid_recv + 64, mid) ) )
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
- if (0 < buffer)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RECV %u\n", mid);
+ if (GNUNET_YES == ch->reliable)
{
- GNUNET_assert (NULL != ch);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " really sending!\n");
- send_local_ack (ch, fwd);
+ /* Is this the exact next expected messasge? */
+ if (mid == rel->mid_recv)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
+ rel->mid_recv++;
+ channel_send_client_data (ch, msg, fwd);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
+ channel_rel_add_buffered_data (msg, rel);
+ }
}
- }
- else if (NULL == c)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on all connections\n");
- GNUNET_assert (NULL != ch);
- channel_send_connections_ack (ch, buffer, fwd);
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
- connection_send_ack (c, buffer, fwd);
- }
-}
-
-
-/**
- * Channel was ACK'd by remote peer, mark as ready and cancel retransmission.
- *
- * @param ch Channel to mark as ready.
- * @param fwd Was the CREATE message sent fwd?
- */
-static void
-channel_confirm (struct MeshChannel *ch, int fwd)
-{
- struct MeshChannelReliability *rel;
- struct MeshReliableMessage *copy;
- struct MeshReliableMessage *next;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " channel confirm %s %s:%X\n",
- fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid);
- ch->state = MESH_CHANNEL_READY;
-
- rel = fwd ? ch->root_rel : ch->dest_rel;
- for (copy = rel->head_sent; NULL != copy; copy = next)
- {
- struct GNUNET_MessageHeader *msg;
-
- next = copy->next;
- msg = (struct GNUNET_MessageHeader *) ©[1];
- if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE)
+ else
{
- rel_message_free (copy);
- /* TODO return? */
+ /* Tunnel is unreliable: send to clients directly */
+ /* FIXME: accept Out Of Order traffic */
+ rel->mid_recv = mid + 1;
+ channel_send_client_data (ch, msg, fwd);
}
}
- send_ack (NULL, ch, fwd);
-}
-
-
-/**
- * Save a copy to retransmit in case it gets lost.
- *
- * Initializes all needed callbacks and timers.
- *
- * @param ch Channel this message goes on.
- * @param msg Message to copy.
- * @param fwd Is this fwd traffic?
- */
-static void
-channel_save_copy (struct MeshChannel *ch,
- const struct GNUNET_MessageHeader *msg,
- int fwd)
-{
- struct MeshChannelReliability *rel;
- struct MeshReliableMessage *copy;
- uint32_t mid;
- uint16_t type;
- uint16_t size;
-
- rel = fwd ? ch->root_rel : ch->dest_rel;
- mid = rel->mid_send;
- type = ntohs (msg->type);
- size = ntohs (msg->size);
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! SAVE %u\n", mid);
- copy = GNUNET_malloc (sizeof (struct MeshReliableMessage) + size);
- copy->mid = mid;
- copy->timestamp = GNUNET_TIME_absolute_get ();
- copy->rel = rel;
- copy->type = type;
- memcpy (©[1], msg, size);
- rel->n_sent++;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
- GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
- if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
- {
- rel->retry_timer =
- GNUNET_TIME_relative_multiply (rel->expected_delay,
- MESH_RETRANSMIT_MARGIN);
- rel->retry_task =
- GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
- &channel_retransmit_message,
- rel);
- }
-}
-
-
-/**
- * Send keepalive packets for a connection.
- *
- * @param c Connection to keep alive..
- * @param fwd Is this a FWD keepalive? (owner -> dest).
- */
-static void
-connection_keepalive (struct MeshConnection *c, int fwd)
-{
- struct GNUNET_MESH_ConnectionKeepAlive *msg;
- size_t size = sizeof (struct GNUNET_MESH_ConnectionKeepAlive);
- char cbuf[size];
- uint16_t type;
-
- type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE :
- GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "sending %s keepalive for connection %s[%d]\n",
- fwd ? "FWD" : "BCK",
- peer2s (c->t->peer),
- c->id);
-
- msg = (struct GNUNET_MESH_ConnectionKeepAlive *) cbuf;
- msg->header.size = htons (size);
- msg->header.type = htons (type);
- msg->cid = c->id;
-
- send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
-}
-
-
-/**
- * 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 MeshConnection *c, int fwd)
-{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
- if (fwd)
- send_connection_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 MeshConnection *c, int fwd)
-{
- if (MESH_TUNNEL_SEARCHING == c->t->state)
- {
- /* TODO DHT GET with RO_BART */
- return;
- }
- switch (c->state)
{
- case MESH_CONNECTION_NEW:
- GNUNET_break (0);
- case MESH_CONNECTION_SENT:
- connection_recreate (c, fwd);
- break;
- case MESH_CONNECTION_READY:
- connection_keepalive (c, fwd);
- break;
- default:
- break;
+ GNUNET_break_op (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " MID %u not expected (%u - %u), dropping!\n",
+ mid, rel->mid_recv, rel->mid_recv + 64);
}
-}
-
-
-static void
-connection_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct MeshConnection *c = cls;
-
- c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- return;
-
- connection_maintain (c, GNUNET_YES);
- c->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
- &connection_fwd_keepalive,
- c);
-}
-
-
-static void
-connection_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct MeshConnection *c = cls;
-
- c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- return;
-
- connection_maintain (c, GNUNET_NO);
- c->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
- &connection_bck_keepalive,
- c);
-}
-
-
-/**
- * Send a message to all peers in this connection that the connection
- * is no longer valid.
- *
- * 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.
- */
-static void
-connection_send_destroy (struct MeshConnection *c)
-{
- struct GNUNET_MESH_ConnectionDestroy msg;
-
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);;
- msg.cid = c->id;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " sending connection destroy for connection %s[%X]\n",
- peer2s (c->t->peer),
- c->id);
-
- if (GNUNET_NO == connection_is_terminal (c, GNUNET_YES))
- send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_YES);
- if (GNUNET_NO == connection_is_terminal (c, GNUNET_NO))
- send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_NO);
- c->destroy = GNUNET_YES;
-}
-
-
-/**
- * Confirm we got a channel create.
- *
- * @param ch The channel to confirm.
- * @param fwd Should we send the ACK fwd?
- */
-static void
-channel_send_ack (struct MeshChannel *ch, int fwd)
-{
- struct GNUNET_MESH_ChannelManage msg;
-
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " sending channel %s ack for channel %s:%X\n",
- fwd ? "FWD" : "BCK", peer2s (ch->t->peer),
- ch->gid);
- msg.chid = htonl (ch->gid);
- send_prebuilt_message_channel (&msg.header, ch, !fwd);
+ channel_send_data_ack (ch, fwd);
}
-
/**
- * Send a message to all clients (local and remote) of this channel
- * notifying that the channel is no longer valid.
- *
- * If some peer or client should not receive the message,
- * should be zero'ed out before calling this function.
+ * Handler for mesh network traffic end-to-end ACKs.
*
- * @param ch The channel whose clients to notify.
+ * @param t Tunnel on which we got this message.
+ * @param message Data message.
+ * @param fwd Is this a fwd ACK? (dest->orig)
*/
static void
-channel_send_destroy (struct MeshChannel *ch)
-{
- struct GNUNET_MESH_ChannelManage msg;
-
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " sending channel destroy for channel %s:%X\n",
- peer2s (ch->t->peer),
- ch->gid);
-
- if (channel_is_terminal (ch, GNUNET_NO))
- {
- if (NULL != ch->root && GNUNET_NO == ch->root->shutting_down)
- {
- msg.chid = htonl (ch->lid_root);
- send_local_channel_destroy (ch, GNUNET_NO);
- }
- }
- else
- {
- msg.chid = htonl (ch->gid);
- send_prebuilt_message_channel (&msg.header, ch, GNUNET_NO);
- }
-
- if (channel_is_terminal (ch, GNUNET_YES))
- {
- if (NULL != ch->dest && GNUNET_NO == ch->dest->shutting_down)
- {
- msg.chid = htonl (ch->lid_dest);
- send_local_channel_destroy (ch, GNUNET_YES);
- }
- }
- else
- {
- msg.chid = htonl (ch->gid);
- send_prebuilt_message_channel (&msg.header, ch, GNUNET_YES);
- }
-}
-
-
-/**
- * Create a tunnel.
- */
-static struct MeshTunnel2 *
-tunnel_new (void)
-{
- struct MeshTunnel2 *t;
-
- t = GNUNET_new (struct MeshTunnel2);
- t->next_chid = 0;
- t->next_local_chid = GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
-// if (GNUNET_OK !=
-// GNUNET_CONTAINER_multihashmap_put (tunnels, tid, t,
-// GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
-// {
-// GNUNET_break (0);
-// tunnel_destroy (t);
-// return NULL;
-// }
-
-// char salt[] = "salt";
-// GNUNET_CRYPTO_kdf (&t->e_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
-// salt, sizeof (salt),
-// &t->e_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
-// &my_full_id, sizeof (struct GNUNET_PeerIdentity),
-// GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
-// NULL);
-// GNUNET_CRYPTO_kdf (&t->d_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
-// salt, sizeof (salt),
-// &t->d_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
-// GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
-// &my_full_id, sizeof (struct GNUNET_PeerIdentity),
-// NULL);
-
- return t;
-}
-
-
-/**
- * Add a connection to a tunnel.
- *
- * @param t Tunnel.
- * @param c Connection.
- */
-static void
-tunnel_add_connection (struct MeshTunnel2 *t, struct MeshConnection *c)
-{
- struct MeshConnection *aux;
- c->t = t;
- for (aux = t->connection_head; aux != NULL; aux = aux->next)
- if (aux == c)
- return;
- GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, c);
-}
-
-
-/**
- * Initialize a Flow Control structure to the initial state.
- *
- * @param fc Flow Control structure to initialize.
- */
-static void
-fc_init (struct MeshFlowControl *fc)
-{
- fc->next_pid = 0;
- fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
- fc->last_pid_recv = (uint32_t) -1;
- fc->last_ack_sent = (uint32_t) 0;
- fc->last_ack_recv = (uint32_t) 0;
- fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
- fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
- fc->queue_n = 0;
- fc->queue_max = (max_msgs_queue / max_connections) + 1;
-}
-
-
-static struct MeshConnection *
-connection_new (const struct GNUNET_HashCode *cid)
-{
- struct MeshConnection *c;
-
- c = GNUNET_new (struct MeshConnection);
- c->id = *cid;
- GNUNET_CONTAINER_multihashmap_put (connections, &c->id, c,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
- fc_init (&c->fwd_fc);
- fc_init (&c->bck_fc);
- c->fwd_fc.c = c;
- c->bck_fc.c = c;
-
- return c;
-}
-
-
-/**
- * Find a connection.
- *
- * @param cid Connection ID.
- */
-static struct MeshConnection *
-connection_get (const struct GNUNET_HashCode *cid)
-{
- return GNUNET_CONTAINER_multihashmap_get (connections, cid);
-}
-
-
-static void
-connection_destroy (struct MeshConnection *c)
-{
- struct MeshPeer *peer;
-
- if (NULL == c)
- return;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s[%X]\n",
- peer2s (c->t->peer),
- c->id);
-
- /* Cancel all traffic */
- connection_cancel_queues (c, GNUNET_YES);
- connection_cancel_queues (c, GNUNET_NO);
-
- /* Cancel maintainance task (keepalive/timeout) */
- if (GNUNET_SCHEDULER_NO_TASK != c->fwd_maintenance_task)
- GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
- if (GNUNET_SCHEDULER_NO_TASK != c->bck_maintenance_task)
- GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
-
- /* Deregister from neighbors */
- peer = connection_get_next_hop (c);
- if (NULL != peer && NULL != peer->connections)
- GNUNET_CONTAINER_multihashmap_remove (peer->connections, &c->id, c);
- peer = connection_get_prev_hop (c);
- if (NULL != peer && NULL != peer->connections)
- GNUNET_CONTAINER_multihashmap_remove (peer->connections, &c->id, c);
-
- /* Delete */
- GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO);
- GNUNET_CONTAINER_DLL_remove (c->t->connection_head, c->t->connection_tail, c);
- GNUNET_free (c);
-}
-
-
-static void
-tunnel_destroy (struct MeshTunnel2 *t)
-{
- struct MeshConnection *c;
- struct MeshConnection *next;
-
- if (NULL == t)
- return;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n",
- peer2s (t->peer));
-
-// if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t))
-// GNUNET_break (0);
-
- for (c = t->connection_head; NULL != c; c = next)
- {
- next = c->next;
- connection_destroy (c);
- }
-
- GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
- t->peer->tunnel = NULL;
-
- GNUNET_free (t);
-}
-
-
-/**
- * Tunnel is empty: destroy it.
- *
- * Notifies all connections about the destruction.
- *
- * @param t Tunnel to destroy.
- */
-static void
-tunnel_destroy_empty (struct MeshTunnel2 *t)
-{
- struct MeshConnection *c;
-
- for (c = t->connection_head; NULL != c; c = c->next)
- {
- if (GNUNET_NO == c->destroy)
- connection_send_destroy (c);
- }
-
- if (0 == t->pending_messages)
- tunnel_destroy (t);
- else
- t->destroy = GNUNET_YES;
-}
-
-
-/**
- * Destroy tunnel if empty (no more channels).
- *
- * @param t Tunnel to destroy if empty.
- */
-static void
-tunnel_destroy_if_empty (struct MeshTunnel2 *t)
-{
- if (NULL != t->channel_head)
- return;
-
- tunnel_destroy_empty (t);
-}
-
-
-/**
- * Destroy a channel and free all resources.
- *
- * @param ch Channel to destroy.
- */
-static void
-channel_destroy (struct MeshChannel *ch)
-{
- struct MeshClient *c;
-
- if (NULL == ch)
- return;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying channel %s:%u\n",
- peer2s (ch->t->peer), ch->gid);
- channel_debug (ch);
-
- c = ch->root;
- if (NULL != c)
- {
- if (GNUNET_YES != GNUNET_CONTAINER_multihashmap32_remove (c->own_channels,
- ch->lid_root, ch))
- {
- GNUNET_break (0);
- }
- }
-
- c = ch->dest;
- if (NULL != c)
- {
- if (GNUNET_YES !=
- GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels,
- ch->lid_dest, ch))
- {
- GNUNET_break (0);
- }
- }
-
- channel_rel_free_all (ch->root_rel);
- channel_rel_free_all (ch->dest_rel);
-
- GNUNET_CONTAINER_DLL_remove (ch->t->channel_head, ch->t->channel_tail, ch);
- GNUNET_STATISTICS_update (stats, "# channels", -1, GNUNET_NO);
-
- GNUNET_free (ch);
-}
-
-/**
- * Create a new channel.
- *
- * @param t Tunnel this channel is in.
- * @param owner Client that owns the channel, NULL for foreign channels.
- * @param lid_root Local ID for root client.
- *
- * @return A new initialized channel. NULL on error.
- */
-static struct MeshChannel *
-channel_new (struct MeshTunnel2 *t,
- struct MeshClient *owner, MESH_ChannelNumber lid_root)
-{
- struct MeshChannel *ch;
-
- ch = GNUNET_new (struct MeshChannel);
- ch->root = owner;
- ch->lid_root = lid_root;
- ch->t = t;
-
- GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
-
- if (NULL != owner)
- {
- while (NULL != channel_get (t, t->next_chid))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists (%p)...\n",
- t->next_chid, channel_get (t, t->next_chid));
- t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
- }
- ch->gid = t->next_chid;
- t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
-
- if (GNUNET_OK !=
- GNUNET_CONTAINER_multihashmap32_put (owner->own_channels, lid_root, ch,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
- {
- GNUNET_break (0);
- channel_destroy (ch);
- GNUNET_SERVER_receive_done (owner->handle, GNUNET_SYSERR);
- return NULL;
- }
- }
- GNUNET_CONTAINER_DLL_insert (t->channel_head, t->channel_tail, ch);
-
- return ch;
-}
-
-
-/**
- * Set options in a channel, extracted from a bit flag field
- *
- * @param ch Channel to set options to.
- * @param options Bit array in host byte order.
- */
-static void
-channel_set_options (struct MeshChannel *ch, uint32_t options)
-{
- ch->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
- GNUNET_YES : GNUNET_NO;
- ch->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
- GNUNET_YES : GNUNET_NO;
-}
-
-
-/**
- * Iterator for deleting each channel whose client endpoint disconnected.
- *
- * @param cls Closure (client that has disconnected).
- * @param key The local channel id (used to access the hashmap).
- * @param value The value stored at the key (channel to destroy).
- *
- * @return GNUNET_OK, keep iterating.
- */
-static int
-channel_destroy_iterator (void *cls,
- uint32_t key,
- void *value)
-{
- struct MeshChannel *ch = value;
- struct MeshClient *c = cls;
- struct MeshTunnel2 *t;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " Channel %X (%X / %X) destroy, due to client %u shutdown.\n",
- ch->gid, ch->lid_root, ch->lid_dest, c->id);
- channel_debug (ch);
-
- if (c == ch->dest)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
- }
- if (c == ch->root)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
- }
-
- t = ch->t;
- channel_send_destroy (ch);
- channel_destroy (ch);
- tunnel_destroy_if_empty (t);
-
- return GNUNET_OK;
-}
-
-
-/**
- * Remove client's ports from the global hashmap on disconnect.
- *
- * @param cls Closure (unused).
- * @param key Port.
- * @param value Client structure.
- *
- * @return GNUNET_OK, keep iterating.
- */
-static int
-client_release_ports (void *cls,
- uint32_t key,
- void *value)
-{
- int res;
-
- res = GNUNET_CONTAINER_multihashmap32_remove (ports, key, value);
- if (GNUNET_YES != res)
- {
- GNUNET_break (0);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "Port %u by client %p was not registered.\n",
- key, value);
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Timeout function due to lack of keepalive/traffic from the owner.
- * Destroys connection if called.
- *
- * @param cls Closure (connection to destroy).
- * @param tc TaskContext.
- */
-static void
-connection_fwd_timeout (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct MeshConnection *c = cls;
-
- c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- return;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Connection %s[%X] FWD timed out. Destroying.\n",
- peer2s (c->t->peer),
- c->id);
-
- if (connection_is_origin (c, GNUNET_YES)) /* If local, leave. */
- return;
-
- connection_destroy (c);
-}
-
-
-/**
- * Timeout function due to lack of keepalive/traffic from the destination.
- * Destroys connection if called.
- *
- * @param cls Closure (connection to destroy).
- * @param tc TaskContext
- */
-static void
-connection_bck_timeout (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct MeshConnection *c = cls;
-
- c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- return;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Connection %s[%X] FWD timed out. Destroying.\n",
- peer2s (c->t->peer),
- c->id);
-
- if (connection_is_origin (c, GNUNET_NO)) /* If local, leave. */
- return;
-
- connection_destroy (c);
-}
-
-
-/**
- * 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 tiemout 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 MeshConnection *c, int fwd)
-{
- GNUNET_SCHEDULER_TaskIdentifier *ti;
- GNUNET_SCHEDULER_Task f;
-
- ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
-
- if (GNUNET_SCHEDULER_NO_TASK != *ti)
- GNUNET_SCHEDULER_cancel (*ti);
-
- if (connection_is_origin (c, fwd)) /* Endpoint */
- {
- f = fwd ? &connection_fwd_keepalive : &connection_bck_keepalive;
- *ti = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, f, c);
- }
- else /* Relay */
- {
- struct GNUNET_TIME_Relative delay;
-
- delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
- f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
- *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
- }
-}
-
-
-/**
- * Iterator to notify all connections of a broken link. Mark connections
- * to destroy after all traffic has been sent.
- *
- * @param cls Closure (peer disconnected).
- * @param key Current key code (tid).
- * @param value Value in the hash map (connection).
- *
- * @return GNUNET_YES if we should continue to iterate,
- * GNUNET_NO if not.
- */
-static int
-connection_broken (void *cls,
- const struct GNUNET_HashCode *key,
- void *value)
-{
- struct MeshPeer *peer = cls;
- struct MeshConnection *c = value;
- struct GNUNET_MESH_ConnectionBroken msg;
- int fwd;
-
- fwd = peer == connection_get_prev_hop (c);
-
- connection_cancel_queues (c, !fwd);
- if (connection_is_terminal (c, fwd))
- {
- /* Local shutdown, no one to notify about this. */
- connection_destroy (c);
- return GNUNET_YES;
- }
-
- msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectionBroken));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN);
- msg.cid = c->id;
- msg.peer1 = my_full_id;
- msg.peer2 = *GNUNET_PEER_resolve2 (peer->id);
- send_prebuilt_message_connection (&msg.header, c, NULL, fwd);
- c->destroy = GNUNET_YES;
-
- return GNUNET_YES;
-}
-
-/******************************************************************************/
-/**************** MESH NETWORK HANDLER HELPERS ***********************/
-/******************************************************************************/
-
-/**
- * Free a transmission that was already queued with all resources
- * associated to the request.
- *
- * @param queue Queue handler to cancel.
- * @param clear_cls Is it necessary to free associated cls?
- */
-static void
-queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
-{
- struct MeshPeer *peer;
- struct MeshFlowControl *fc;
- int fwd;
-
- fwd = queue->fwd;
- peer = queue->peer;
- GNUNET_assert (NULL != queue->c);
- fc = fwd ? &queue->c->fwd_fc : &queue->c->bck_fc;
-
- if (GNUNET_YES == clear_cls)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " queue destroy type %s\n",
- GNUNET_MESH_DEBUG_M2S (queue->type));
- switch (queue->type)
- {
- case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
- case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
- GNUNET_break (GNUNET_YES == queue->c->destroy);
- /* fall through */
- case GNUNET_MESSAGE_TYPE_MESH_FWD:
- case GNUNET_MESSAGE_TYPE_MESH_BCK:
- case GNUNET_MESSAGE_TYPE_MESH_ACK:
- case GNUNET_MESSAGE_TYPE_MESH_POLL:
- case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
- case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
- case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prebuilt message\n");;
- GNUNET_free_non_null (queue->cls);
- break;
-
- default:
- GNUNET_break (0);
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
- GNUNET_MESH_DEBUG_M2S (queue->type));
- }
-
- }
- GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
-
- if (queue->type != GNUNET_MESSAGE_TYPE_MESH_ACK &&
- queue->type != GNUNET_MESSAGE_TYPE_MESH_POLL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Q_N- %p %u\n", fc, fc->queue_n);
- fc->queue_n--;
- peer->queue_n--;
- }
- if (NULL != queue->c)
- {
- queue->c->pending_messages--;
- if (NULL != queue->c->t)
- {
- queue->c->t->pending_messages--;
- }
- }
-
- GNUNET_free (queue);
-}
-
-
-static size_t
-queue_send (void *cls, size_t size, void *buf)
-{
- struct MeshPeer *peer = cls;
- struct MeshFlowControl *fc;
- struct MeshConnection *c;
- struct GNUNET_MessageHeader *msg;
- struct MeshPeerQueue *queue;
- struct MeshTunnel2 *t;
- struct MeshChannel *ch;
- const struct GNUNET_PeerIdentity *dst_id;
- size_t data_size;
- uint32_t pid;
- uint16_t type;
- int fwd;
-
- peer->core_transmit = NULL;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send (max %u)\n", size);
-
- if (NULL == buf || 0 == size)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n");
- return 0;
- }
-
- /* Initialize */
- queue = peer_get_first_message (peer);
- if (NULL == queue)
- {
- GNUNET_break (0); /* Core tmt_rdy should've been canceled */
- return 0;
- }
- c = queue->c;
- fwd = queue->fwd;
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
-
- dst_id = GNUNET_PEER_resolve2 (peer->id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* towards %s\n", GNUNET_i2s (dst_id));
- /* Check if buffer size is enough for the message */
- if (queue->size > size)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not enough room, reissue\n");
- peer->core_transmit =
- GNUNET_CORE_notify_transmit_ready (core_handle,
- GNUNET_NO,
- 0,
- GNUNET_TIME_UNIT_FOREVER_REL,
- dst_id,
- queue->size,
- &queue_send,
- peer);
- return 0;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size %u ok\n", queue->size);
-
- t = (NULL != c) ? c->t : NULL;
- type = 0;
-
- /* Fill buf */
- switch (queue->type)
- {
- case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
- case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
- case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
- case GNUNET_MESSAGE_TYPE_MESH_FWD:
- case GNUNET_MESSAGE_TYPE_MESH_BCK:
- case GNUNET_MESSAGE_TYPE_MESH_ACK:
- case GNUNET_MESSAGE_TYPE_MESH_POLL:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "* raw: %s\n",
- GNUNET_MESH_DEBUG_M2S (queue->type));
- data_size = send_core_data_raw (queue->cls, size, buf);
- msg = (struct GNUNET_MessageHeader *) buf;
- type = ntohs (msg->type);
- break;
- case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
- if (connection_is_origin (c, GNUNET_YES))
- data_size = send_core_connection_create (queue->c, size, buf);
- else
- data_size = send_core_data_raw (queue->cls, size, buf);
- break;
- case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
- if (connection_is_origin (c, GNUNET_NO) ||
- connection_is_origin (c, GNUNET_YES))
- data_size = send_core_connection_ack (queue->c, size, buf);
- else
- data_size = send_core_data_raw (queue->cls, size, buf);
- break;
- case GNUNET_MESSAGE_TYPE_MESH_DATA:
- case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
- case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
- /* This should be encapsulted */
- GNUNET_break (0);
- data_size = 0;
- break;
- default:
- GNUNET_break (0);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "* type unknown: %u\n",
- queue->type);
- data_size = 0;
- }
-
- if (0 < drop_percent &&
- GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "Dropping message of type %s\n",
- GNUNET_MESH_DEBUG_M2S (queue->type));
- data_size = 0;
- }
-
- /* Free queue, but cls was freed by send_core_* */
- ch = queue->ch;
- queue_destroy (queue, GNUNET_NO);
-
- /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
- switch (type)
- {
- case GNUNET_MESSAGE_TYPE_MESH_FWD:
- case GNUNET_MESSAGE_TYPE_MESH_BCK:
- pid = ntohl ( ((struct GNUNET_MESH_Encrypted *) buf)->pid );
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* accounting pid %u\n", pid);
- fc->last_pid_sent = pid;
- send_ack (c, ch, fwd);
- break;
- default:
- break;
- }
-
- /* If more data in queue, send next */
- queue = peer_get_first_message (peer);
- if (NULL != queue)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
- if (NULL == peer->core_transmit) {
- peer->core_transmit =
- GNUNET_CORE_notify_transmit_ready(core_handle,
- 0,
- 0,
- GNUNET_TIME_UNIT_FOREVER_REL,
- dst_id,
- queue->size,
- &queue_send,
- peer);
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "* tmt rdy called somewhere else\n");
- }
- if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* starting poll timeout\n");
- fc->poll_task =
- GNUNET_SCHEDULER_add_delayed (fc->poll_time, &connection_poll, fc);
- }
- }
- else
- {
- if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
- {
- GNUNET_SCHEDULER_cancel (fc->poll_task);
- fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
- }
- }
- if (NULL != c)
- {
- c->pending_messages--;
- if (GNUNET_YES == c->destroy && 0 == c->pending_messages)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying connection!\n");
- connection_destroy (c);
- }
- }
-
- if (NULL != t)
- {
- t->pending_messages--;
- if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
- {
-// GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
- tunnel_destroy (t);
- }
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
- return data_size;
-}
-
-
-static void
-queue_add (void *cls, uint16_t type, size_t size,
- struct MeshConnection *c,
- struct MeshChannel *ch,
- int fwd)
-{
- struct MeshPeerQueue *queue;
- struct MeshFlowControl *fc;
- struct MeshPeer *peer;
- int priority;
- int call_core;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "queue add %s %s (%u) on c %p, ch %p\n",
- fwd ? "FWD" : "BCK", GNUNET_MESH_DEBUG_M2S (type), size, c, ch);
- GNUNET_assert (NULL != c);
-
- fc = fwd ? &c->fwd_fc : &c->bck_fc;
- peer = fwd ? connection_get_next_hop (c) : connection_get_prev_hop (c);
-
- if (NULL == fc)
- {
- GNUNET_break (0);
- return;
- }
-
- if (NULL == peer->connections)
- {
- /* We are not connected to this peer, ignore request. */
- GNUNET_break_op (0);
- return;
- }
-
- priority = 0;
-
- if (GNUNET_MESSAGE_TYPE_MESH_POLL == type ||
- GNUNET_MESSAGE_TYPE_MESH_ACK == type)
- {
- priority = 100;
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "fc %p\n", fc);
- if (fc->queue_n >= fc->queue_max && 0 == priority)
- {
- GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
- 1, GNUNET_NO);
- GNUNET_break (0);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "queue full: %u/%u\n",
- fc->queue_n, fc->queue_max);
- return; /* Drop this message */
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "last pid %u\n", fc->last_pid_sent);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", fc->last_ack_recv);
- if (GMC_is_pid_bigger (fc->last_pid_sent + 1, fc->last_ack_recv))
- {
- call_core = GNUNET_NO;
- if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task &&
- GNUNET_MESSAGE_TYPE_MESH_POLL != type)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "no buffer space (%u > %u): starting poll\n",
- fc->last_pid_sent + 1, fc->last_ack_recv);
- fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
- &connection_poll,
- fc);
- }
- }
- else
- call_core = GNUNET_YES;
- queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
- queue->cls = cls;
- queue->type = type;
- queue->size = size;
- queue->peer = peer;
- queue->c = c;
- queue->ch = ch;
- queue->fwd = fwd;
- if (100 <= priority)
- {
- struct MeshPeerQueue *copy;
- struct MeshPeerQueue *next;
-
- for (copy = peer->queue_head; NULL != copy; copy = next)
- {
- next = copy->next;
- if (copy->type == type && copy->c == c && copy->fwd == fwd)
- {
- /* Example: also a FWD ACK for connection XYZ */
- queue_destroy (copy, GNUNET_YES);
- }
- }
- GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, queue);
- }
- else
- {
- GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, queue);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Q_N+ %p %u\n", fc, fc->queue_n);
- fc->queue_n++;
- peer->queue_n++;
- }
-
- if (NULL == peer->core_transmit && GNUNET_YES == call_core)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "calling core tmt rdy towards %s for %u bytes\n",
- peer2s (peer), size);
- peer->core_transmit =
- GNUNET_CORE_notify_transmit_ready (core_handle,
- 0,
- 0,
- GNUNET_TIME_UNIT_FOREVER_REL,
- GNUNET_PEER_resolve2 (peer->id),
- size,
- &queue_send,
- peer);
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "core tmt rdy towards %s already called\n",
- peer2s (peer));
-
- }
- c->pending_messages++;
- if (NULL != c->t)
- c->t->pending_messages++;
-}
-
-
-/******************************************************************************/
-/******************** MESH NETWORK HANDLERS **************************/
-/******************************************************************************/
-
-
-/**
- * Generic handler for mesh network payload traffic.
- *
- * @param t Tunnel on which we got this message.
- * @param message Unencryted data message.
- * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
- */
-static void
-handle_data (struct MeshTunnel2 *t, const struct GNUNET_MESH_Data *msg, int fwd)
-{
- struct MeshChannelReliability *rel;
- struct MeshChannel *ch;
- struct MeshClient *c;
- uint32_t mid;
- uint16_t type;
- size_t size;
-
- /* Check size */
- size = ntohs (msg->header.size);
- if (size <
- sizeof (struct GNUNET_MESH_Data) +
- sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break (0);
- return;
- }
- type = ntohs (msg->header.type);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message\n",
- GNUNET_MESH_DEBUG_M2S (type));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
- GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
-
- /* Check channel */
- ch = channel_get (t, ntohl (msg->chid));
- if (NULL == ch)
- {
- GNUNET_STATISTICS_update (stats, "# data on unknown channel", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
- ntohl (msg->chid));
- return;
- }
-
- /* Initialize FWD/BCK data */
- c = fwd ? ch->dest : ch->root;
- rel = fwd ? ch->dest_rel : ch->root_rel;
-
- if (NULL == c)
- {
- GNUNET_break (0);
- return;
- }
-
- tunnel_change_state (t, MESH_TUNNEL_READY);
-
- GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
-
- mid = ntohl (msg->mid);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " mid %u\n", mid);
-
- if (GNUNET_NO == ch->reliable ||
- ( !GMC_is_pid_bigger (rel->mid_recv, mid) &&
- GMC_is_pid_bigger (rel->mid_recv + 64, mid) ) )
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RECV %u\n", mid);
- if (GNUNET_YES == ch->reliable)
- {
- /* Is this the exact next expected messasge? */
- if (mid == rel->mid_recv)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
- rel->mid_recv++;
- channel_send_client_data (ch, msg, fwd);
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
- channel_rel_add_buffered_data (msg, rel);
- }
- }
- else
- {
- /* Tunnel is unreliable: send to clients directly */
- /* FIXME: accept Out Of Order traffic */
- rel->mid_recv = mid + 1;
- channel_send_client_data (ch, msg, fwd);
- }
- }
- else
- {
- GNUNET_break_op (0);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " MID %u not expected (%u - %u), dropping!\n",
- mid, rel->mid_recv, rel->mid_recv + 64);
- }
-
- channel_send_data_ack (ch, fwd);
-}
-
-/**
- * Handler for mesh network traffic end-to-end ACKs.
- *
- * @param t Tunnel on which we got this message.
- * @param message Data message.
- * @param fwd Is this a fwd ACK? (dest->orig)
- */
-static void
-handle_data_ack (struct MeshTunnel2 *t,
- const struct GNUNET_MESH_DataACK *msg, int fwd)
-{
- struct MeshChannelReliability *rel;
- struct MeshReliableMessage *copy;
- struct MeshReliableMessage *next;
- struct MeshChannel *ch;
- uint32_t ack;
- uint16_t type;
- int work;
-
- type = ntohs (msg->header.type);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message!\n",
- GNUNET_MESH_DEBUG_M2S (type));
- ch = channel_get (t, ntohl (msg->chid));
- if (NULL == ch)
- {
- GNUNET_STATISTICS_update (stats, "# ack on unknown channel", 1, GNUNET_NO);
- return;
- }
- ack = ntohl (msg->mid);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! %s ACK %u\n",
- (GNUNET_YES == fwd) ? "FWD" : "BCK", ack);
-
- if (GNUNET_YES == fwd)
- {
- rel = ch->root_rel;
- }
- else
- {
- rel = ch->dest_rel;
- }
- if (NULL == rel)
- {
- GNUNET_break (0);
- return;
- }
-
- for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
- {
- if (GMC_is_pid_bigger (copy->mid, ack))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid);
- channel_rel_free_sent (rel, msg);
- break;
- }
- work = GNUNET_YES;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->mid);
- next = copy->next;
- rel_message_free (copy);
- }
- /* ACK client if needed */
-// channel_send_ack (t, type, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type);
-
- /* If some message was free'd, update the retransmission delay*/
- if (GNUNET_YES == work)
- {
- if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
- {
- GNUNET_SCHEDULER_cancel (rel->retry_task);
- if (NULL == rel->head_sent)
- {
- rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
- }
- else
- {
- struct GNUNET_TIME_Absolute new_target;
- struct GNUNET_TIME_Relative delay;
-
- delay = GNUNET_TIME_relative_multiply (rel->retry_timer,
- MESH_RETRANSMIT_MARGIN);
- new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
- delay);
- delay = GNUNET_TIME_absolute_get_remaining (new_target);
- rel->retry_task =
- GNUNET_SCHEDULER_add_delayed (delay,
- &channel_retransmit_message,
- rel);
- }
- }
- else
- GNUNET_break (0);
- }
-}
-
-
-/**
- * Core handler for connection creation.
- *
- * @param cls Closure (unused).
- * @param peer Sender (neighbor).
- * @param message Message.
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
- */
-static int
-handle_mesh_connection_create (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_ConnectionCreate *msg;
- struct GNUNET_PeerIdentity *id;
- struct GNUNET_HashCode *cid;
- struct MeshPeerPath *path;
- struct MeshPeer *dest_peer;
- struct MeshPeer *orig_peer;
- struct MeshConnection *c;
- unsigned int own_pos;
- uint16_t size;
- uint16_t i;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection create msg\n");
-
- /* Check size */
- size = ntohs (message->size);
- if (size < sizeof (struct GNUNET_MESH_ConnectionCreate))
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
-
- /* Calculate hops */
- size -= sizeof (struct GNUNET_MESH_ConnectionCreate);
- if (size % sizeof (struct GNUNET_PeerIdentity))
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
- size /= sizeof (struct GNUNET_PeerIdentity);
- if (1 > size)
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
-
- /* Get parameters */
- msg = (struct GNUNET_MESH_ConnectionCreate *) message;
- cid = &msg->cid;
- id = (struct GNUNET_PeerIdentity *) &msg[1];
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " connection %s (%s).\n",
- GNUNET_h2s (cid), GNUNET_i2s (id));
-
- /* Create connection */
- c = connection_get (cid);
- if (NULL == c)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
- c = connection_new (cid);
- if (NULL == c)
- return GNUNET_OK;
- connection_reset_timeout (c, GNUNET_YES);
-
- /* Create path */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
- path = path_new (size);
- own_pos = 0;
- for (i = 0; i < size; i++)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
- GNUNET_i2s (&id[i]));
- path->peers[i] = GNUNET_PEER_intern (&id[i]);
- if (path->peers[i] == myid)
- own_pos = i;
- }
- if (own_pos == 0 && path->peers[own_pos] != myid)
- {
- /* create path: self not found in path through self */
- GNUNET_break_op (0);
- path_destroy (path);
- connection_destroy (c);
- return GNUNET_OK;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
- path_add_to_peers (path, GNUNET_NO);
- c->path = path_duplicate (path);
- c->own_pos = own_pos;
- }
- else
- {
- path = NULL;
- }
- if (MESH_CONNECTION_NEW == c->state)
- connection_change_state (c, MESH_CONNECTION_SENT);
-
- /* Remember peers */
- dest_peer = peer_get (&id[size - 1]);
- orig_peer = peer_get (&id[0]);
-
- /* Is it a connection to us? */
- if (c->own_pos == size - 1)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
- peer_add_path_to_origin (orig_peer, path, GNUNET_YES);
-
- if (NULL == orig_peer->tunnel)
- {
- orig_peer->tunnel = tunnel_new ();
- orig_peer->tunnel->peer = orig_peer;
- }
- tunnel_add_connection (orig_peer->tunnel, c);
- if (MESH_TUNNEL_NEW == c->t->state)
- tunnel_change_state (c->t, MESH_TUNNEL_WAITING);
-
- send_connection_ack (c, GNUNET_NO);
- if (MESH_CONNECTION_SENT == c->state)
- connection_change_state (c, MESH_CONNECTION_ACK);
-
- /* Keep tunnel alive in direction dest->owner*/
- connection_reset_timeout (c, GNUNET_NO);
- }
- else
- {
- /* It's for somebody else! Retransmit. */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
- peer_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
- peer_add_path_to_origin (orig_peer, path, GNUNET_NO);
- send_prebuilt_message_connection (message, c, NULL, GNUNET_YES);
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Core handler for path ACKs
- *
- * @param cls closure
- * @param message message
- * @param peer peer identity this notification is about
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
- */
-static int
-handle_mesh_connection_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_ConnectionACK *msg;
- struct MeshConnection *c;
- struct MeshPeerPath *p;
- struct MeshPeer *pi;
- int fwd;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection ACK msg\n");
- msg = (struct GNUNET_MESH_ConnectionACK *) message;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on connection %s\n",
- GNUNET_h2s (&msg->cid));
- c = connection_get (&msg->cid);
- if (NULL == c)
- {
- GNUNET_STATISTICS_update (stats, "# control on unknown connection",
- 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
- return GNUNET_OK;
- }
-
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
- GNUNET_i2s (peer));
- pi = peer_get (peer);
- if (connection_get_next_hop (c) == pi)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " SYNACK\n");
- fwd = GNUNET_NO;
- if (MESH_CONNECTION_SENT == c->state)
- connection_change_state (c, MESH_CONNECTION_ACK);
- }
- else if (connection_get_prev_hop (c) == pi)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK\n");
- fwd = GNUNET_YES;
- connection_change_state (c, MESH_CONNECTION_READY);
- }
- else
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
- connection_reset_timeout (c, fwd);
-
- /* Add path to peers? */
- p = c->path;
- if (NULL != p)
- {
- path_add_to_peers (p, GNUNET_YES);
- }
- else
- {
- GNUNET_break (0);
- }
-
- /* Message for us as creator? */
- if (connection_is_origin (c, GNUNET_YES))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Connection (SYN)ACK for us!\n");
- connection_change_state (c, MESH_CONNECTION_READY);
- if (MESH_TUNNEL_READY != c->t->state)
- tunnel_change_state (c->t, MESH_TUNNEL_READY);
- send_connection_ack (c, GNUNET_YES);
- tunnel_send_queued_data (c->t, GNUNET_YES);
- if (3 <= tunnel_count_connections (c->t) && NULL != c->t->peer->dhtget)
- {
- GNUNET_DHT_get_stop (c->t->peer->dhtget);
- c->t->peer->dhtget = NULL;
- }
- return GNUNET_OK;
- }
-
- /* Message for us as destination? */
- if (connection_is_terminal (c, GNUNET_YES))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
- if (MESH_TUNNEL_READY != c->t->state)
- tunnel_change_state (c->t, MESH_TUNNEL_READY);
- connection_change_state (c, MESH_CONNECTION_READY);
- tunnel_send_queued_data (c->t, GNUNET_NO);
- return GNUNET_OK;
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
- send_prebuilt_message_connection (message, c, NULL, fwd);
- return GNUNET_OK;
-}
-
-
-/**
- * Core handler for notifications of broken paths
- *
- * @param cls Closure (unused).
- * @param peer Peer identity of sending neighbor.
- * @param message Message.
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
- */
-static int
-handle_mesh_connection_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_ConnectionBroken *msg;
- struct MeshConnection *c;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received a CONNECTION BROKEN msg from %s\n", GNUNET_i2s (peer));
- msg = (struct GNUNET_MESH_ConnectionBroken *) message;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
- GNUNET_i2s (&msg->peer1));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
- GNUNET_i2s (&msg->peer2));
- c = connection_get (&msg->cid);
- if (NULL == c)
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
- tunnel_notify_connection_broken (c->t, GNUNET_PEER_search (&msg->peer1),
- GNUNET_PEER_search (&msg->peer2));
- return GNUNET_OK;
-
-}
-
-
-/**
- * Core handler for tunnel destruction
- *
- * @param cls Closure (unused).
- * @param peer Peer identity of sending neighbor.
- * @param message Message.
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
- */
-static int
-handle_mesh_connection_destroy (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_ConnectionDestroy *msg;
- struct MeshConnection *c;
- GNUNET_PEER_Id id;
- int fwd;
-
- msg = (struct GNUNET_MESH_ConnectionDestroy *) message;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Got a CONNECTION DESTROY message from %s\n",
- GNUNET_i2s (peer));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " for connection %s\n",
- GNUNET_h2s (&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 tunnel",
- 1, GNUNET_NO);
- return GNUNET_OK;
- }
- id = GNUNET_PEER_search (peer);
- if (id == connection_get_prev_hop (c)->id)
- fwd = GNUNET_YES;
- else if (id == connection_get_next_hop (c)->id)
- fwd = GNUNET_NO;
- else
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
- send_prebuilt_message_connection (message, c, NULL, fwd);
- c->destroy = GNUNET_YES;
-
- return GNUNET_OK;
-}
-
-
-/**
- * Handler for channel create messages.
- *
- * @param t Tunnel this channel is to be created in.
- * @param msg Message.
- * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
- */
-static void
-handle_channel_create (struct MeshTunnel2 *t,
- struct GNUNET_MESH_ChannelCreate *msg,
- int fwd)
-{
- MESH_ChannelNumber chid;
- struct MeshChannel *ch;
- struct MeshClient *c;
- uint32_t port;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received Channel Create\n");
- /* Check message size */
- if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelCreate))
- {
- GNUNET_break_op (0);
- return;
- }
-
- /* Check if channel exists */
- chid = ntohl (msg->chid);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " chid %u\n", chid);
- ch = channel_get (t, chid);
- if (NULL != ch)
- {
- /* Probably a retransmission, safe to ignore */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
- if (NULL != ch->dest)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " duplicate CC!!\n");
- channel_send_ack (ch, !fwd);
- return;
- }
- }
- else
- {
- /* Create channel */
- ch = channel_new (t, NULL, 0);
- ch->gid = chid;
- channel_set_options (ch, ntohl (msg->opt));
- }
-
- /* Find a destination client */
- port = ntohl (msg->port);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port %u\n", port);
- c = GNUNET_CONTAINER_multihashmap32_get (ports, port);
- if (NULL == c)
- {
- /* TODO send reject */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " no client has port registered\n");
- /* TODO free ch */
- return;
- }
-
- channel_add_client (ch, c);
- if (GNUNET_YES == ch->reliable)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
-
- send_local_channel_create (ch);
- channel_send_ack (ch, fwd);
- send_local_ack (ch, !fwd);
-}
-
-
-/**
- * Handler for channel ack messages.
- *
- * @param t Tunnel this channel is to be created in.
- * @param msg Message.
- * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
- */
-static void
-handle_channel_ack (struct MeshTunnel2 *t,
- struct GNUNET_MESH_ChannelManage *msg,
- int fwd)
-{
- MESH_ChannelNumber chid;
- struct MeshChannel *ch;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received Channel ACK\n");
- /* Check message size */
- if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelManage))
- {
- GNUNET_break_op (0);
- return;
- }
-
- /* Check if channel exists */
- chid = ntohl (msg->chid);
- ch = channel_get (t, chid);
- if (NULL == ch)
- {
- GNUNET_break_op (0);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " channel %u unknown!!\n", chid);
- return;
- }
-
- channel_confirm (ch, !fwd);
-}
-
-
-/**
- * Handler for channel destroy messages.
- *
- * @param t Tunnel this channel is to be destroyed of.
- * @param msg Message.
- * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
- */
-static void
-handle_channel_destroy (struct MeshTunnel2 *t,
- struct GNUNET_MESH_ChannelManage *msg,
- int fwd)
+handle_data_ack (struct MeshTunnel2 *t,
+ const struct GNUNET_MESH_DataACK *msg, int fwd)
{
- MESH_ChannelNumber chid;
+ struct MeshChannelReliability *rel;
+ struct MeshReliableMessage *copy;
+ struct MeshReliableMessage *next;
struct MeshChannel *ch;
+ uint32_t ack;
+ uint16_t type;
+ int work;
- /* Check message size */
- if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelManage))
+ type = ntohs (msg->header.type);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message!\n",
+ GNUNET_MESH_DEBUG_M2S (type));
+ ch = channel_get (t, ntohl (msg->chid));
+ if (NULL == ch)
{
- GNUNET_break_op (0);
+ GNUNET_STATISTICS_update (stats, "# ack on unknown channel", 1, GNUNET_NO);
return;
}
+ ack = ntohl (msg->mid);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! %s ACK %u\n",
+ (GNUNET_YES == fwd) ? "FWD" : "BCK", ack);
- /* Check if channel exists */
- chid = ntohl (msg->chid);
- ch = channel_get (t, chid);
- if (NULL == ch)
+ if (GNUNET_YES == fwd)
{
- /* Probably a retransmission, safe to ignore */
- return;
+ rel = ch->root_rel;
}
- if ( (fwd && NULL == ch->dest) || (!fwd && NULL == ch->root) )
+ else
{
- /* Not for us (don't destroy twice a half-open loopback channel) */
+ rel = ch->dest_rel;
+ }
+ if (NULL == rel)
+ {
+ GNUNET_break (0);
return;
}
- send_local_channel_destroy (ch, fwd);
- channel_destroy (ch);
-}
-
-
-static void
-handle_decrypted (struct MeshTunnel2 *t,
- const struct GNUNET_MessageHeader *msgh,
- int fwd)
-{
- switch (ntohs (msgh->type))
+ for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
{
- case GNUNET_MESSAGE_TYPE_MESH_DATA:
- /* Don't send hop ACK, wait for client to ACK */
- handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
- break;
-
- case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
- handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
- break;
-
- case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
- handle_channel_create (t,
- (struct GNUNET_MESH_ChannelCreate *) msgh,
- fwd);
- break;
-
- case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
- handle_channel_ack (t,
- (struct GNUNET_MESH_ChannelManage *) msgh,
- fwd);
+ if (GMC_is_pid_bigger (copy->mid, ack))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid);
+ channel_rel_free_sent (rel, msg);
break;
+ }
+ work = GNUNET_YES;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->mid);
+ next = copy->next;
+ rel_message_free (copy);
+ }
+ /* ACK client if needed */
+// channel_send_ack (t, type, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type);
- case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
- handle_channel_destroy (t,
- (struct GNUNET_MESH_ChannelManage *) msgh,
- fwd);
- break;
+ /* If some message was free'd, update the retransmission delay*/
+ if (GNUNET_YES == work)
+ {
+ if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
+ {
+ GNUNET_SCHEDULER_cancel (rel->retry_task);
+ if (NULL == rel->head_sent)
+ {
+ rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ else
+ {
+ struct GNUNET_TIME_Absolute new_target;
+ struct GNUNET_TIME_Relative delay;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "end-to-end message not known (%u)\n",
- ntohs (msgh->type));
+ delay = GNUNET_TIME_relative_multiply (rel->retry_timer,
+ MESH_RETRANSMIT_MARGIN);
+ new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
+ delay);
+ delay = GNUNET_TIME_absolute_get_remaining (new_target);
+ rel->retry_task =
+ GNUNET_SCHEDULER_add_delayed (delay,
+ &channel_retransmit_message,
+ rel);
+ }
+ }
+ else
+ GNUNET_break (0);
}
}
/**
- * Generic handler for mesh network encrypted traffic.
+ * Core handler for connection creation.
*
- * @param peer Peer identity this notification is about.
- * @param message Encrypted message.
- * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
+ * @param cls Closure (unused).
+ * @param peer Sender (neighbor).
+ * @param message Message.
*
* @return GNUNET_OK to keep the connection open,
* GNUNET_SYSERR to close it (signal serious error)
*/
static int
-handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MESH_Encrypted *msg,
- int fwd)
+handle_mesh_connection_create (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
{
+ struct GNUNET_MESH_ConnectionCreate *msg;
+ struct GNUNET_PeerIdentity *id;
+ struct GNUNET_HashCode *cid;
+ struct MeshPeerPath *path;
+ struct MeshPeer *dest_peer;
+ struct MeshPeer *orig_peer;
struct MeshConnection *c;
- struct MeshTunnel2 *t;
- struct MeshPeer *neighbor;
- struct MeshFlowControl *fc;
- uint32_t pid;
- uint32_t ttl;
- uint16_t type;
- size_t size;
+ unsigned int own_pos;
+ uint16_t size;
+ uint16_t i;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection create msg\n");
/* Check size */
- size = ntohs (msg->header.size);
- if (size <
- sizeof (struct GNUNET_MESH_Encrypted) +
- sizeof (struct GNUNET_MessageHeader))
+ size = ntohs (message->size);
+ if (size < sizeof (struct GNUNET_MESH_ConnectionCreate))
{
GNUNET_break_op (0);
return GNUNET_OK;
}
- type = ntohs (msg->header.type);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
- GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
- /* Check connection */
- c = connection_get (&msg->cid);
- if (NULL == c)
+ /* Calculate hops */
+ size -= sizeof (struct GNUNET_MESH_ConnectionCreate);
+ if (size % sizeof (struct GNUNET_PeerIdentity))
{
- GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING connection unknown\n");
+ GNUNET_break_op (0);
return GNUNET_OK;
}
- t = c->t;
- fc = fwd ? &c->bck_fc : &c->fwd_fc;
-
- /* Check if origin is as expected */
- neighbor = connection_get_hop (c, !fwd);
- if (peer_get (peer)->id != neighbor->id)
+ size /= sizeof (struct GNUNET_PeerIdentity);
+ if (1 > size)
{
GNUNET_break_op (0);
return GNUNET_OK;
}
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
- /* Check PID */
- pid = ntohl (msg->pid);
- if (GMC_is_pid_bigger (pid, fc->last_ack_sent))
- {
- GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "WARNING Received PID %u, (prev %u), ACK %u\n",
- pid, fc->last_pid_recv, fc->last_ack_sent);
- return GNUNET_OK;
- }
- if (GNUNET_NO == GMC_is_pid_bigger (pid, fc->last_pid_recv))
- {
- GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " Pid %u not expected (%u+), dropping!\n",
- pid, fc->last_pid_recv + 1);
- return GNUNET_OK;
- }
- if (MESH_CONNECTION_SENT == c->state)
- connection_change_state (c, MESH_CONNECTION_READY);
- connection_reset_timeout (c, fwd);
- fc->last_pid_recv = pid;
+ /* Get parameters */
+ msg = (struct GNUNET_MESH_ConnectionCreate *) message;
+ cid = &msg->cid;
+ id = (struct GNUNET_PeerIdentity *) &msg[1];
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " connection %s (%s).\n",
+ GNUNET_h2s (cid), GNUNET_i2s (id));
- /* Is this message for us? */
- if (connection_is_terminal (c, fwd))
+ /* Create connection */
+ c = connection_get (cid);
+ if (NULL == c)
{
- size_t dsize = size - sizeof (struct GNUNET_MESH_Encrypted);
- char cbuf[dsize];
- struct GNUNET_MessageHeader *msgh;
- unsigned int off;
-
- /* TODO signature verification */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
- GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
+ c = connection_new (cid);
+ if (NULL == c)
+ return GNUNET_OK;
+ connection_reset_timeout (c, GNUNET_YES);
- fc->last_pid_recv = pid;
- tunnel_decrypt (t, cbuf, &msg[1], dsize, msg->iv, fwd);
- off = 0;
- while (off < dsize)
+ /* Create path */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
+ path = path_new (size);
+ own_pos = 0;
+ for (i = 0; i < size; i++)
{
- msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
- handle_decrypted (t, msgh, fwd);
- off += ntohs (msgh->size);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
+ GNUNET_i2s (&id[i]));
+ path->peers[i] = GNUNET_PEER_intern (&id[i]);
+ if (path->peers[i] == myid)
+ own_pos = i;
}
- send_ack (c, NULL, fwd);
- return GNUNET_OK;
- }
-
- /* Message not for us: forward to next hop */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
- ttl = ntohl (msg->ttl);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
- if (ttl == 0)
+ if (own_pos == 0 && path->peers[own_pos] != myid)
+ {
+ /* create path: self not found in path through self */
+ GNUNET_break_op (0);
+ path_destroy (path);
+ connection_destroy (c);
+ return GNUNET_OK;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
+ path_add_to_peers (path, GNUNET_NO);
+ c->path = path_duplicate (path);
+ c->own_pos = own_pos;
+ }
+ else
{
- GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
- send_ack (c, NULL, fwd);
- return GNUNET_OK;
+ path = NULL;
}
- GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
+ if (MESH_CONNECTION_NEW == c->state)
+ connection_change_state (c, MESH_CONNECTION_SENT);
- send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
+ /* Remember peers */
+ dest_peer = peer_get (&id[size - 1]);
+ orig_peer = peer_get (&id[0]);
- return GNUNET_OK;
-}
+ /* Is it a connection to us? */
+ if (c->own_pos == size - 1)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
+ peer_add_path_to_origin (orig_peer, path, GNUNET_YES);
+ if (NULL == orig_peer->tunnel)
+ {
+ orig_peer->tunnel = tunnel_new ();
+ orig_peer->tunnel->peer = orig_peer;
+ }
+ tunnel_add_connection (orig_peer->tunnel, c);
+ if (MESH_TUNNEL_NEW == c->t->state)
+ tunnel_change_state (c->t, MESH_TUNNEL_WAITING);
-/**
- * Core handler for mesh network traffic going orig->dest.
- *
- * @param cls Closure (unused).
- * @param message Message received.
- * @param peer Peer who sent the message.
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
- */
-static int
-handle_mesh_fwd (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- return handle_mesh_encrypted (peer,
- (struct GNUNET_MESH_Encrypted *)message,
- GNUNET_YES);
-}
+ send_connection_ack (c, GNUNET_NO);
+ if (MESH_CONNECTION_SENT == c->state)
+ connection_change_state (c, MESH_CONNECTION_ACK);
-/**
- * Core handler for mesh network traffic going dest->orig.
- *
- * @param cls Closure (unused).
- * @param message Message received.
- * @param peer Peer who sent the message.
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
- */
-static int
-handle_mesh_bck (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- return handle_mesh_encrypted (peer,
- (struct GNUNET_MESH_Encrypted *)message,
- GNUNET_NO);
+ /* Keep tunnel alive in direction dest->owner*/
+ connection_reset_timeout (c, GNUNET_NO);
+ }
+ else
+ {
+ /* It's for somebody else! Retransmit. */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
+ peer_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
+ peer_add_path_to_origin (orig_peer, path, GNUNET_NO);
+ send_prebuilt_message_connection (message, c, NULL, GNUNET_YES);
+ }
+ return GNUNET_OK;
}
/**
- * Core handler for mesh network traffic point-to-point acks.
+ * Core handler for path ACKs
*
* @param cls closure
* @param message message
* GNUNET_SYSERR to close it (signal serious error)
*/
static int
-handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
+handle_mesh_connection_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
{
- struct GNUNET_MESH_ACK *msg;
+ struct GNUNET_MESH_ConnectionACK *msg;
struct MeshConnection *c;
- struct MeshFlowControl *fc;
- GNUNET_PEER_Id id;
- uint32_t ack;
+ struct MeshPeerPath *p;
+ struct MeshPeer *pi;
int fwd;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
- GNUNET_i2s (peer));
- msg = (struct GNUNET_MESH_ACK *) message;
-
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection ACK msg\n");
+ msg = (struct GNUNET_MESH_ConnectionACK *) message;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on connection %s\n",
+ GNUNET_h2s (&msg->cid));
c = connection_get (&msg->cid);
-
if (NULL == c)
{
- GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1,
- GNUNET_NO);
+ GNUNET_STATISTICS_update (stats, "# control on unknown connection",
+ 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
return GNUNET_OK;
}
- /* Is this a forward or backward ACK? */
- id = GNUNET_PEER_search (peer);
- if (connection_get_next_hop (c)->id == id)
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
+ GNUNET_i2s (peer));
+ pi = peer_get (peer);
+ if (connection_get_next_hop (c) == pi)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
- fc = &c->fwd_fc;
- fwd = GNUNET_YES;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " SYNACK\n");
+ fwd = GNUNET_NO;
+ if (MESH_CONNECTION_SENT == c->state)
+ connection_change_state (c, MESH_CONNECTION_ACK);
}
- else if (connection_get_prev_hop (c)->id == id)
+ else if (connection_get_prev_hop (c) == pi)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
- fc = &c->bck_fc;
- fwd = GNUNET_NO;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK\n");
+ fwd = GNUNET_YES;
+ connection_change_state (c, MESH_CONNECTION_READY);
}
else
{
GNUNET_break_op (0);
return GNUNET_OK;
}
+ connection_reset_timeout (c, fwd);
- ack = ntohl (msg->ack);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u (was %u)\n",
- ack, fc->last_ack_recv);
- if (GMC_is_pid_bigger (ack, fc->last_ack_recv))
- fc->last_ack_recv = ack;
+ /* Add path to peers? */
+ p = c->path;
+ if (NULL != p)
+ {
+ path_add_to_peers (p, GNUNET_YES);
+ }
+ else
+ {
+ GNUNET_break (0);
+ }
- /* Cancel polling if the ACK is big enough. */
- if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
- GMC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
+ /* Message for us as creator? */
+ if (connection_is_origin (c, GNUNET_YES))
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
- GNUNET_SCHEDULER_cancel (fc->poll_task);
- fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
- fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Connection (SYN)ACK for us!\n");
+ connection_change_state (c, MESH_CONNECTION_READY);
+ if (MESH_TUNNEL_READY != c->t->state)
+ tunnel_change_state (c->t, MESH_TUNNEL_READY);
+ send_connection_ack (c, GNUNET_YES);
+ tunnel_send_queued_data (c->t, GNUNET_YES);
+ if (3 <= tunnel_count_connections (c->t) && NULL != c->t->peer->dhtget)
+ {
+ GNUNET_DHT_get_stop (c->t->peer->dhtget);
+ c->t->peer->dhtget = NULL;
+ }
+ return GNUNET_OK;
}
- connection_unlock_queue (c, fwd);
+ /* Message for us as destination? */
+ if (GMC_is_terminal (c, GNUNET_YES))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
+ if (MESH_TUNNEL_READY != c->t->state)
+ tunnel_change_state (c->t, MESH_TUNNEL_READY);
+ connection_change_state (c, MESH_CONNECTION_READY);
+ tunnel_send_queued_data (c->t, GNUNET_NO);
+ return GNUNET_OK;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
+ send_prebuilt_message_connection (message, c, NULL, fwd);
return GNUNET_OK;
}
/**
- * Core handler for mesh network traffic point-to-point ack polls.
+ * Core handler for notifications of broken paths
*
- * @param cls closure
- * @param message message
- * @param peer peer identity this notification is about
+ * @param cls Closure (unused).
+ * @param peer Peer identity of sending neighbor.
+ * @param message Message.
*
* @return GNUNET_OK to keep the connection open,
* GNUNET_SYSERR to close it (signal serious error)
*/
static int
-handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
+handle_mesh_connection_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
{
- struct GNUNET_MESH_Poll *msg;
+ struct GNUNET_MESH_ConnectionBroken *msg;
struct MeshConnection *c;
- struct MeshFlowControl *fc;
- GNUNET_PEER_Id id;
- uint32_t pid;
- int fwd;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a POLL packet from %s!\n",
- GNUNET_i2s (peer));
-
- msg = (struct GNUNET_MESH_Poll *) message;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received a CONNECTION BROKEN msg from %s\n", GNUNET_i2s (peer));
+ msg = (struct GNUNET_MESH_ConnectionBroken *) message;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
+ GNUNET_i2s (&msg->peer1));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
+ GNUNET_i2s (&msg->peer2));
c = connection_get (&msg->cid);
-
if (NULL == c)
- {
- GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
- GNUNET_NO);
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
-
- /* 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.
- */
- id = GNUNET_PEER_search (peer);
- if (connection_get_next_hop (c)->id == id)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
- fc = &c->fwd_fc;
- }
- else if (connection_get_prev_hop (c)->id == id)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
- fc = &c->bck_fc;
- }
- else
{
GNUNET_break_op (0);
return GNUNET_OK;
}
-
- pid = ntohl (msg->pid);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n",
- pid, fc->last_pid_recv);
- fc->last_pid_recv = pid;
- fwd = fc == &c->fwd_fc;
- send_ack (c, NULL, fwd);
-
+ tunnel_notify_connection_broken (c->t, GNUNET_PEER_search (&msg->peer1),
+ GNUNET_PEER_search (&msg->peer2));
return GNUNET_OK;
+
}
/**
- * Core handler for mesh keepalives.
+ * Core handler for tunnel destruction
+ *
+ * @param cls Closure (unused).
+ * @param peer Peer identity of sending neighbor.
+ * @param message Message.
*
- * @param cls closure
- * @param message message
- * @param peer peer identity this notification is about
* @return GNUNET_OK to keep the connection open,
* GNUNET_SYSERR to close it (signal serious error)
- *
- * TODO: Check who we got this from, to validate route.
*/
static int
-handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
+handle_mesh_connection_destroy (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
{
- struct GNUNET_MESH_ConnectionKeepAlive *msg;
+ struct GNUNET_MESH_ConnectionDestroy *msg;
struct MeshConnection *c;
- struct MeshPeer *neighbor;
+ GNUNET_PEER_Id id;
int fwd;
- msg = (struct GNUNET_MESH_ConnectionKeepAlive *) message;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
+ msg = (struct GNUNET_MESH_ConnectionDestroy *) message;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Got a CONNECTION DESTROY message from %s\n",
GNUNET_i2s (peer));
-
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " for connection %s\n",
+ GNUNET_h2s (&msg->cid));
c = connection_get (&msg->cid);
if (NULL == c)
{
- GNUNET_STATISTICS_update (stats, "# keepalive on unknown connection", 1,
- GNUNET_NO);
+ /* 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 tunnel",
+ 1, GNUNET_NO);
return GNUNET_OK;
}
-
- fwd = GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE == ntohs (message->type) ?
- GNUNET_YES : GNUNET_NO;
-
- /* Check if origin is as expected */
- neighbor = connection_get_hop (c, fwd);
- if (peer_get (peer)->id != neighbor->id)
+ id = GNUNET_PEER_search (peer);
+ if (id == connection_get_prev_hop (c)->id)
+ fwd = GNUNET_YES;
+ else if (id == connection_get_next_hop (c)->id)
+ fwd = GNUNET_NO;
+ else
{
GNUNET_break_op (0);
return GNUNET_OK;
}
-
- connection_change_state (c, MESH_CONNECTION_READY);
- connection_reset_timeout (c, fwd);
-
- if (connection_is_terminal (c, fwd))
- return GNUNET_OK;
-
- GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
send_prebuilt_message_connection (message, c, NULL, fwd);
+ c->destroy = GNUNET_YES;
return GNUNET_OK;
}
-
-/**
- * Functions to handle messages from core
- */
-static struct GNUNET_CORE_MessageHandler core_handlers[] = {
- {&handle_mesh_connection_create, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
- 0},
- {&handle_mesh_connection_ack, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
- sizeof (struct GNUNET_MESH_ConnectionACK)},
- {&handle_mesh_connection_broken, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN,
- sizeof (struct GNUNET_MESH_ConnectionBroken)},
- {&handle_mesh_connection_destroy, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY,
- sizeof (struct GNUNET_MESH_ConnectionDestroy)},
- {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE,
- sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
- {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE,
- sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
- {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
- sizeof (struct GNUNET_MESH_ACK)},
- {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
- sizeof (struct GNUNET_MESH_Poll)},
- {&handle_mesh_fwd, GNUNET_MESSAGE_TYPE_MESH_FWD, 0},
- {&handle_mesh_bck, GNUNET_MESSAGE_TYPE_MESH_BCK, 0},
- {NULL, 0, 0}
-};
-
-
/**
- * Function to process paths received for a new peer addition. The recorded
- * paths form the initial tunnel, which can be optimized later.
- * Called on each result obtained for the DHT search.
+ * Handler for channel create messages.
*
- * @param cls closure
- * @param exp when will this value expire
- * @param key key of the result
- * @param get_path path of the get request
- * @param get_path_length lenght of get_path
- * @param put_path path of the put request
- * @param put_path_length length of the put_path
- * @param type type of the result
- * @param size number of bytes in data
- * @param data pointer to the result data
+ * @param t Tunnel this channel is to be created in.
+ * @param msg Message.
+ * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
*/
static void
-dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
- const struct GNUNET_HashCode * key,
- const struct GNUNET_PeerIdentity *get_path,
- unsigned int get_path_length,
- const struct GNUNET_PeerIdentity *put_path,
- unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
- size_t size, const void *data)
+handle_channel_create (struct MeshTunnel2 *t,
+ struct GNUNET_MESH_ChannelCreate *msg,
+ int fwd)
{
- struct MeshPeer *peer = cls;
- struct MeshPeerPath *p;
- struct MeshConnection *c;
- struct GNUNET_PeerIdentity pi;
- int i;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
- GNUNET_PEER_resolve (peer->id, &pi);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
-
- p = path_build_from_dht (get_path, get_path_length,
- put_path, put_path_length);
- path_add_to_peers (p, GNUNET_NO);
- path_destroy (p);
-
- /* Count connections */
- for (c = peer->tunnel->connection_head, i = 0; NULL != c; c = c->next, i++);
+ MESH_ChannelNumber chid;
+ struct MeshChannel *ch;
+ struct MeshClient *c;
+ uint32_t port;
- /* If we already have 3 (or more (?!)) connections, it's enough */
- if (3 <= i)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received Channel Create\n");
+ /* Check message size */
+ if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelCreate))
+ {
+ GNUNET_break_op (0);
return;
+ }
- if (peer->tunnel->state == MESH_TUNNEL_SEARCHING)
+ /* Check if channel exists */
+ chid = ntohl (msg->chid);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " chid %u\n", chid);
+ ch = channel_get (t, chid);
+ if (NULL != ch)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
- peer_connect (peer);
+ /* Probably a retransmission, safe to ignore */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
+ if (NULL != ch->dest)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " duplicate CC!!\n");
+ channel_send_ack (ch, !fwd);
+ return;
+ }
+ }
+ else
+ {
+ /* Create channel */
+ ch = channel_new (t, NULL, 0);
+ ch->gid = chid;
+ channel_set_options (ch, ntohl (msg->opt));
+ }
+
+ /* Find a destination client */
+ port = ntohl (msg->port);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port %u\n", port);
+ c = GNUNET_CONTAINER_multihashmap32_get (ports, port);
+ if (NULL == c)
+ {
+ /* TODO send reject */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " no client has port registered\n");
+ /* TODO free ch */
+ return;
}
- return;
-}
+ channel_add_client (ch, c);
+ if (GNUNET_YES == ch->reliable)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
-/******************************************************************************/
-/********************* MESH LOCAL HANDLES **************************/
-/******************************************************************************/
+ send_local_channel_create (ch);
+ channel_send_ack (ch, fwd);
+ send_local_ack (ch, !fwd);
+}
/**
- * Handler for client connection.
+ * Handler for channel ack messages.
*
- * @param cls Closure (unused).
- * @param client Client handler.
+ * @param t Tunnel this channel is to be created in.
+ * @param msg Message.
+ * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
*/
static void
-handle_local_client_connect (void *cls, struct GNUNET_SERVER_Client *client)
+handle_channel_ack (struct MeshTunnel2 *t,
+ struct GNUNET_MESH_ChannelManage *msg,
+ int fwd)
{
- struct MeshClient *c;
+ MESH_ChannelNumber chid;
+ struct MeshChannel *ch;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received Channel ACK\n");
+ /* Check message size */
+ if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelManage))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
- if (NULL == client)
+ /* Check if channel exists */
+ chid = ntohl (msg->chid);
+ ch = channel_get (t, chid);
+ if (NULL == ch)
+ {
+ GNUNET_break_op (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " channel %u unknown!!\n", chid);
return;
- c = GNUNET_malloc (sizeof (struct MeshClient));
- c->handle = client;
- c->id = next_client_id++; /* overflow not important: just for debug */
- GNUNET_SERVER_client_keep (client);
- GNUNET_SERVER_client_set_user_context (client, c);
- GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
+ }
+
+ channel_confirm (ch, !fwd);
}
/**
- * Handler for client disconnection
+ * Handler for channel destroy messages.
*
- * @param cls closure
- * @param client identification of the client; NULL
- * for the last call when the server is destroyed
+ * @param t Tunnel this channel is to be destroyed of.
+ * @param msg Message.
+ * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
*/
static void
-handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
+handle_channel_destroy (struct MeshTunnel2 *t,
+ struct GNUNET_MESH_ChannelManage *msg,
+ int fwd)
{
- struct MeshClient *c;
+ MESH_ChannelNumber chid;
+ struct MeshChannel *ch;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
- if (client == NULL)
+ /* Check message size */
+ if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelManage))
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
+ GNUNET_break_op (0);
return;
}
- c = client_get (client);
- if (NULL != c)
+ /* Check if channel exists */
+ chid = ntohl (msg->chid);
+ ch = channel_get (t, chid);
+ if (NULL == ch)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u, %p)\n",
- c->id, c);
- GNUNET_SERVER_client_drop (c->handle);
- c->shutting_down = GNUNET_YES;
- if (NULL != c->own_channels)
- {
- GNUNET_CONTAINER_multihashmap32_iterate (c->own_channels,
- &channel_destroy_iterator, c);
- GNUNET_CONTAINER_multihashmap32_destroy (c->own_channels);
- }
-
- if (NULL != c->incoming_channels)
- {
- GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_channels,
- &channel_destroy_iterator, c);
- GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_channels);
- }
-
- if (NULL != c->ports)
- {
- GNUNET_CONTAINER_multihashmap32_iterate (c->ports,
- &client_release_ports, c);
- GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
- }
- GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
- GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client free (%p)\n", c);
- GNUNET_free (c);
+ /* Probably a retransmission, safe to ignore */
+ return;
}
- else
+ if ( (fwd && NULL == ch->dest) || (!fwd && NULL == ch->root) )
{
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
+ /* Not for us (don't destroy twice a half-open loopback channel) */
+ return;
}
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
- return;
+
+ send_local_channel_destroy (ch, fwd);
+ channel_destroy (ch);
}
-/**
- * Handler for new clients
- *
- * @param cls closure
- * @param client identification of the client
- * @param message the actual message, which includes messages the client wants
- */
static void
-handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+handle_decrypted (struct MeshTunnel2 *t,
+ const struct GNUNET_MessageHeader *msgh,
+ int fwd)
{
- struct GNUNET_MESH_ClientConnect *cc_msg;
- struct MeshClient *c;
- unsigned int size;
- uint32_t *p;
- unsigned int i;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
+ switch (ntohs (msgh->type))
+ {
+ case GNUNET_MESSAGE_TYPE_MESH_DATA:
+ /* Don't send hop ACK, wait for client to ACK */
+ handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
+ break;
- /* Check data sanity */
- size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
- cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
- if (0 != (size % sizeof (uint32_t)))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- size /= sizeof (uint32_t);
+ case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
+ handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
+ break;
- /* Initialize new client structure */
- c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
- if (size > 0)
- {
- uint32_t u32;
+ case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
+ handle_channel_create (t,
+ (struct GNUNET_MESH_ChannelCreate *) msgh,
+ fwd);
+ break;
- p = (uint32_t *) &cc_msg[1];
- c->ports = GNUNET_CONTAINER_multihashmap32_create (size);
- for (i = 0; i < size; i++)
- {
- u32 = ntohl (p[i]);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
-
- /* store in client's hashmap */
- GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
- /* store in global hashmap */
- /* FIXME only allow one client to have the port open,
- * have a backup hashmap with waiting clients */
- GNUNET_CONTAINER_multihashmap32_put (ports, u32, c,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
- }
- }
+ case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
+ handle_channel_ack (t,
+ (struct GNUNET_MESH_ChannelManage *) msgh,
+ fwd);
+ break;
- c->own_channels = GNUNET_CONTAINER_multihashmap32_create (32);
- c->incoming_channels = GNUNET_CONTAINER_multihashmap32_create (32);
- GNUNET_SERVER_notification_context_add (nc, client);
- GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
+ case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
+ handle_channel_destroy (t,
+ (struct GNUNET_MESH_ChannelManage *) msgh,
+ fwd);
+ break;
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
+ default:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "end-to-end message not known (%u)\n",
+ ntohs (msgh->type));
+ }
}
/**
- * Handler for requests of new tunnels
+ * Generic handler for mesh network encrypted traffic.
+ *
+ * @param peer Peer identity this notification is about.
+ * @param message Encrypted message.
+ * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
*
- * @param cls Closure.
- * @param client Identification of the client.
- * @param message The actual message.
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
*/
-static void
-handle_local_channel_create (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+static int
+handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MESH_Encrypted *msg,
+ int fwd)
{
- struct GNUNET_MESH_ChannelMessage *msg;
- struct MeshPeer *peer;
+ struct MeshConnection *c;
struct MeshTunnel2 *t;
- struct MeshChannel *ch;
- struct MeshClient *c;
- MESH_ChannelNumber chid;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new channel requested\n");
+ struct MeshPeer *neighbor;
+ struct MeshFlowControl *fc;
+ uint32_t pid;
+ uint32_t ttl;
+ uint16_t type;
+ size_t size;
- /* Sanity check for client registration */
- if (NULL == (c = client_get (client)))
+ /* Check size */
+ size = ntohs (msg->header.size);
+ if (size <
+ sizeof (struct GNUNET_MESH_Encrypted) +
+ sizeof (struct GNUNET_MessageHeader))
{
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
+ GNUNET_break_op (0);
+ return GNUNET_OK;
}
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
+ type = ntohs (msg->header.type);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
+ GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
- /* Message size sanity check */
- if (sizeof (struct GNUNET_MESH_ChannelMessage) != ntohs (message->size))
+ /* Check connection */
+ c = connection_get (&msg->cid);
+ if (NULL == c)
{
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
+ GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING connection unknown\n");
+ return GNUNET_OK;
}
+ t = c->t;
+ fc = fwd ? &c->bck_fc : &c->fwd_fc;
- msg = (struct GNUNET_MESH_ChannelMessage *) message;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n",
- GNUNET_i2s (&msg->peer), ntohl (msg->port));
- chid = ntohl (msg->channel_id);
+ /* Check if origin is as expected */
+ neighbor = connection_get_hop (c, !fwd);
+ if (peer_get (peer)->id != neighbor->id)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
- /* Sanity check for duplicate channel IDs */
- if (NULL != channel_get_by_local_id (c, chid))
+ /* Check PID */
+ pid = ntohl (msg->pid);
+ if (GMC_is_pid_bigger (pid, fc->last_ack_sent))
{
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
+ GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "WARNING Received PID %u, (prev %u), ACK %u\n",
+ pid, fc->last_pid_recv, fc->last_ack_sent);
+ return GNUNET_OK;
+ }
+ if (GNUNET_NO == GMC_is_pid_bigger (pid, fc->last_pid_recv))
+ {
+ GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " Pid %u not expected (%u+), dropping!\n",
+ pid, fc->last_pid_recv + 1);
+ return GNUNET_OK;
}
+ if (MESH_CONNECTION_SENT == c->state)
+ connection_change_state (c, MESH_CONNECTION_READY);
+ connection_reset_timeout (c, fwd);
+ fc->last_pid_recv = pid;
- peer = peer_get (&msg->peer);
- if (NULL == peer->tunnel)
+ /* Is this message for us? */
+ if (GMC_is_terminal (c, fwd))
{
- peer->tunnel = tunnel_new ();
- peer->tunnel->peer = peer;
- if (peer->id == myid)
- {
- tunnel_change_state (peer->tunnel, MESH_TUNNEL_READY);
- }
- else
+ size_t dsize = size - sizeof (struct GNUNET_MESH_Encrypted);
+ char cbuf[dsize];
+ struct GNUNET_MessageHeader *msgh;
+ unsigned int off;
+
+ /* TODO signature verification */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
+ GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
+
+ fc->last_pid_recv = pid;
+ tunnel_decrypt (t, cbuf, &msg[1], dsize, msg->iv, fwd);
+ off = 0;
+ while (off < dsize)
{
- peer_connect (peer);
+ msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
+ handle_decrypted (t, msgh, fwd);
+ off += ntohs (msgh->size);
}
+ send_ack (c, NULL, fwd);
+ return GNUNET_OK;
}
- t = peer->tunnel;
- /* Create channel */
- ch = channel_new (t, c, chid);
- if (NULL == ch)
+ /* Message not for us: forward to next hop */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
+ ttl = ntohl (msg->ttl);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
+ if (ttl == 0)
{
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
+ GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
+ send_ack (c, NULL, fwd);
+ return GNUNET_OK;
}
- ch->port = ntohl (msg->port);
- channel_set_options (ch, ntohl (msg->opt));
-
- /* In unreliable channels, we'll use the DLL to buffer BCK data */
- ch->root_rel = GNUNET_new (struct MeshChannelReliability);
- ch->root_rel->ch = ch;
- ch->root_rel->expected_delay = MESH_RETRANSMIT_TIME;
+ GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED CHANNEL %s[%x]:%u (%x)\n",
- peer2s (t->peer), ch->gid, ch->port, ch->lid_root);
+ send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
- /* Send create channel */
- {
- struct GNUNET_MESH_ChannelCreate msgcc;
+ return GNUNET_OK;
+}
- msgcc.header.size = htons (sizeof (msgcc));
- msgcc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE);
- msgcc.chid = htonl (ch->gid);
- msgcc.port = msg->port;
- msgcc.opt = msg->opt;
- tunnel_queue_data (t, ch, &msgcc.header, GNUNET_YES);
- }
+/**
+ * Core handler for mesh network traffic going orig->dest.
+ *
+ * @param cls Closure (unused).
+ * @param message Message received.
+ * @param peer Peer who sent the message.
+ *
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_mesh_fwd (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ return handle_mesh_encrypted (peer,
+ (struct GNUNET_MESH_Encrypted *)message,
+ GNUNET_YES);
+}
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- return;
+/**
+ * Core handler for mesh network traffic going dest->orig.
+ *
+ * @param cls Closure (unused).
+ * @param message Message received.
+ * @param peer Peer who sent the message.
+ *
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_mesh_bck (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ return handle_mesh_encrypted (peer,
+ (struct GNUNET_MESH_Encrypted *)message,
+ GNUNET_NO);
}
/**
- * Handler for requests of deleting tunnels
+ * Core handler for mesh network traffic point-to-point acks.
*
* @param cls closure
- * @param client identification of the client
- * @param message the actual message
+ * @param message message
+ * @param peer peer identity this notification is about
+ *
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
*/
-static void
-handle_local_channel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+static int
+handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
{
- struct GNUNET_MESH_ChannelMessage *msg;
- struct MeshClient *c;
- struct MeshChannel *ch;
- struct MeshTunnel2 *t;
- MESH_ChannelNumber chid;
+ struct GNUNET_MESH_ACK *msg;
+ struct MeshConnection *c;
+ struct MeshFlowControl *fc;
+ GNUNET_PEER_Id id;
+ uint32_t ack;
+ int fwd;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Got a DESTROY CHANNEL from client!\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
+ GNUNET_i2s (peer));
+ msg = (struct GNUNET_MESH_ACK *) message;
- /* Sanity check for client registration */
- if (NULL == (c = client_get (client)))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
+ c = connection_get (&msg->cid);
- /* Message sanity check */
- if (sizeof (struct GNUNET_MESH_ChannelMessage) != ntohs (message->size))
+ if (NULL == c)
{
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
+ GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1,
+ GNUNET_NO);
+ return GNUNET_OK;
}
- msg = (struct GNUNET_MESH_ChannelMessage *) message;
-
- /* Retrieve tunnel */
- chid = ntohl (msg->channel_id);
- ch = channel_get_by_local_id (c, chid);
- if (NULL == ch)
+ /* Is this a forward or backward ACK? */
+ id = GNUNET_PEER_search (peer);
+ if (connection_get_next_hop (c)->id == id)
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " channel %X not found\n", chid);
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
+ fc = &c->fwd_fc;
+ fwd = GNUNET_YES;
}
-
- /* Cleanup after the tunnel */
- client_delete_channel (c, ch);
- if (c == ch->dest && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV <= chid)
+ else if (connection_get_prev_hop (c)->id == id)
{
- ch->dest = NULL;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
+ fc = &c->bck_fc;
+ fwd = GNUNET_NO;
}
- else if (c == ch->root && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV > chid)
+ else
{
- ch->root = NULL;
+ GNUNET_break_op (0);
+ return GNUNET_OK;
}
- else
+
+ ack = ntohl (msg->ack);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u (was %u)\n",
+ ack, fc->last_ack_recv);
+ if (GMC_is_pid_bigger (ack, fc->last_ack_recv))
+ fc->last_ack_recv = ack;
+
+ /* Cancel polling if the ACK is big enough. */
+ if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
+ GMC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- " channel %X client %p (%p, %p)\n",
- chid, c, ch->root, ch->dest);
- GNUNET_break (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
+ GNUNET_SCHEDULER_cancel (fc->poll_task);
+ fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
+ fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
}
- t = ch->t;
- channel_destroy (ch);
- tunnel_destroy_if_empty (t);
+ connection_unlock_queue (c, fwd);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- return;
+ return GNUNET_OK;
}
/**
- * Handler for client traffic
+ * Core handler for mesh network traffic point-to-point ack polls.
*
* @param cls closure
- * @param client identification of the client
- * @param message the actual message
+ * @param message message
+ * @param peer peer identity this notification is about
+ *
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
*/
-static void
-handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+static int
+handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
{
- struct GNUNET_MESH_LocalData *msg;
- struct MeshClient *c;
- struct MeshChannel *ch;
- struct MeshChannelReliability *rel;
- MESH_ChannelNumber chid;
- size_t size;
+ struct GNUNET_MESH_Poll *msg;
+ struct MeshConnection *c;
+ struct MeshFlowControl *fc;
+ GNUNET_PEER_Id id;
+ uint32_t pid;
int fwd;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Got data from a client!\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a POLL packet from %s!\n",
+ GNUNET_i2s (peer));
- /* Sanity check for client registration */
- if (NULL == (c = client_get (client)))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
+ msg = (struct GNUNET_MESH_Poll *) message;
- msg = (struct GNUNET_MESH_LocalData *) message;
+ c = connection_get (&msg->cid);
- /* Sanity check for message size */
- size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
- if (size < sizeof (struct GNUNET_MessageHeader))
+ if (NULL == c)
{
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
+ GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
+ GNUNET_NO);
+ GNUNET_break_op (0);
+ return GNUNET_OK;
}
- /* Channel exists? */
- chid = ntohl (msg->id);
- fwd = chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
- ch = channel_get_by_local_id (c, chid);
- if (NULL == ch)
+ /* 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.
+ */
+ id = GNUNET_PEER_search (peer);
+ if (connection_get_next_hop (c)->id == id)
{
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
+ fc = &c->fwd_fc;
}
-
- /* Is the client in the channel? */
- if ( !( (fwd &&
- ch->root &&
- ch->root->handle == client)
- ||
- (!fwd &&
- ch->dest &&
- ch->dest->handle == client) ) )
+ else if (connection_get_prev_hop (c)->id == id)
{
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
+ fc = &c->bck_fc;
}
-
- rel = fwd ? ch->root_rel : ch->dest_rel;
- rel->client_ready = GNUNET_NO;
-
- /* Ok, everything is correct, send the message. */
+ else
{
- struct GNUNET_MESH_Data *payload;
- uint16_t p2p_size = sizeof(struct GNUNET_MESH_Data) + size;
- unsigned char cbuf[p2p_size];
-
- payload = (struct GNUNET_MESH_Data *) cbuf;
- payload->mid = htonl (rel->mid_send);
- rel->mid_send++;
- memcpy (&payload[1], &msg[1], size);
- payload->header.size = htons (p2p_size);
- payload->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_DATA);
- payload->chid = htonl (ch->gid);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
- send_prebuilt_message_channel (&payload->header, ch, fwd);
-
- if (GNUNET_YES == ch->reliable)
- channel_save_copy (ch, &payload->header, fwd);
+ GNUNET_break_op (0);
+ return GNUNET_OK;
}
- if (tunnel_get_buffer (ch->t, fwd) > 0)
- send_local_ack (ch, fwd);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- return;
+ pid = ntohl (msg->pid);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n",
+ pid, fc->last_pid_recv);
+ fc->last_pid_recv = pid;
+ fwd = fc == &c->fwd_fc;
+ send_ack (c, NULL, fwd);
+
+ return GNUNET_OK;
}
/**
- * Handler for client's ACKs for payload traffic.
+ * Core handler for mesh keepalives.
*
- * @param cls Closure (unused).
- * @param client Identification of the client.
- * @param message The actual message.
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
+ *
+ * TODO: Check who we got this from, to validate route.
*/
-static void
-handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+static int
+handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
{
- struct GNUNET_MESH_LocalAck *msg;
- struct MeshChannelReliability *rel;
- struct MeshChannel *ch;
- struct MeshClient *c;
- MESH_ChannelNumber chid;
+ struct GNUNET_MESH_ConnectionKeepAlive *msg;
+ struct MeshConnection *c;
+ struct MeshPeer *neighbor;
int fwd;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
+ msg = (struct GNUNET_MESH_ConnectionKeepAlive *) message;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
+ GNUNET_i2s (peer));
- /* Sanity check for client registration */
- if (NULL == (c = client_get (client)))
+ c = connection_get (&msg->cid);
+ if (NULL == c)
{
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
+ GNUNET_STATISTICS_update (stats, "# keepalive on unknown connection", 1,
+ GNUNET_NO);
+ return GNUNET_OK;
}
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
- msg = (struct GNUNET_MESH_LocalAck *) message;
+ fwd = GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE == ntohs (message->type) ?
+ GNUNET_YES : GNUNET_NO;
- /* Channel exists? */
- chid = ntohl (msg->channel_id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on channel %X\n", chid);
- ch = channel_get_by_local_id (c, chid);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " -- ch %p\n", ch);
- if (NULL == ch)
+ /* Check if origin is as expected */
+ neighbor = connection_get_hop (c, fwd);
+ if (peer_get (peer)->id != neighbor->id)
{
- GNUNET_break (0);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Channel %X unknown.\n", chid);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
+ GNUNET_break_op (0);
+ return GNUNET_OK;
}
- /* If client is root, the ACK is going FWD, therefore this is "BCK". */
- /* If client is dest, the ACK is going BCK, therefore this is "FWD" */
- fwd = chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
- rel = fwd ? ch->dest_rel : ch->root_rel;
+ connection_change_state (c, MESH_CONNECTION_READY);
+ connection_reset_timeout (c, fwd);
- rel->client_ready = GNUNET_YES;
- channel_send_client_buffered_data (ch, c, fwd);
- send_ack (NULL, ch, fwd);
+ if (GMC_is_terminal (c, fwd))
+ return GNUNET_OK;
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
+ send_prebuilt_message_connection (message, c, NULL, fwd);
- return;
+ return GNUNET_OK;
}
+
/**
- * Iterator over all tunnels to send a monitoring client info about each tunnel.
- *
- * @param cls Closure (client handle).
- * @param key Key (hashed tunnel ID, unused).
- * @param value Tunnel info.
- *
- * @return GNUNET_YES, to keep iterating.
+ * Functions to handle messages from core
*/
-// static int
-// monitor_all_tunnels_iterator (void *cls,
-// const struct GNUNET_HashCode * key,
-// void *value)
-// {
-// struct GNUNET_SERVER_Client *client = cls;
-// struct MeshChannel *ch = value;
-// struct GNUNET_MESH_LocalMonitor *msg;
-//
-// msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
-// msg->channel_id = htonl (ch->gid);
-// msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
-// msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
-//
-// GNUNET_log (GNUNET_ERROR_TYPE_INFO,
-// "* sending info about tunnel %s\n",
-// GNUNET_i2s (&msg->owner));
-//
-// GNUNET_SERVER_notification_context_unicast (nc, client,
-// &msg->header, GNUNET_NO);
-// return GNUNET_YES;
-// }
+static struct GNUNET_CORE_MessageHandler core_handlers[] = {
+ {&handle_mesh_connection_create, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
+ 0},
+ {&handle_mesh_connection_ack, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
+ sizeof (struct GNUNET_MESH_ConnectionACK)},
+ {&handle_mesh_connection_broken, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN,
+ sizeof (struct GNUNET_MESH_ConnectionBroken)},
+ {&handle_mesh_connection_destroy, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY,
+ sizeof (struct GNUNET_MESH_ConnectionDestroy)},
+ {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE,
+ sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
+ {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE,
+ sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
+ {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
+ sizeof (struct GNUNET_MESH_ACK)},
+ {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
+ sizeof (struct GNUNET_MESH_Poll)},
+ {&handle_mesh_fwd, GNUNET_MESSAGE_TYPE_MESH_FWD, 0},
+ {&handle_mesh_bck, GNUNET_MESSAGE_TYPE_MESH_BCK, 0},
+ {NULL, 0, 0}
+};
/**
- * Handler for client's MONITOR request.
+ * Function to process paths received for a new peer addition. The recorded
+ * paths form the initial tunnel, which can be optimized later.
+ * Called on each result obtained for the DHT search.
*
- * @param cls Closure (unused).
- * @param client Identification of the client.
- * @param message The actual message.
+ * @param cls closure
+ * @param exp when will this value expire
+ * @param key key of the result
+ * @param get_path path of the get request
+ * @param get_path_length lenght of get_path
+ * @param put_path path of the put request
+ * @param put_path_length length of the put_path
+ * @param type type of the result
+ * @param size number of bytes in data
+ * @param data pointer to the result data
*/
static void
-handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
+dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
+ const struct GNUNET_HashCode * key,
+ const struct GNUNET_PeerIdentity *get_path,
+ unsigned int get_path_length,
+ const struct GNUNET_PeerIdentity *put_path,
+ unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
+ size_t size, const void *data)
{
- struct MeshClient *c;
-
- /* Sanity check for client registration */
- if (NULL == (c = client_get (client)))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
+ struct MeshPeer *peer = cls;
+ struct MeshPeerPath *p;
+ struct MeshConnection *c;
+ struct GNUNET_PeerIdentity pi;
+ unsigned int connection_count;
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Received get tunnels request from client %u\n",
- c->id);
-// GNUNET_CONTAINER_multihashmap_iterate (tunnels,
-// monitor_all_tunnels_iterator,
-// client);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Get tunnels request from client %u completed\n",
- c->id);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
-}
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
+ GNUNET_PEER_resolve (peer->id, &pi);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
+ p = path_build_from_dht (get_path, get_path_length,
+ put_path, put_path_length);
+ path_add_to_peers (p, GNUNET_NO);
+ path_destroy (p);
-/**
- * Handler for client's MONITOR_TUNNEL request.
- *
- * @param cls Closure (unused).
- * @param client Identification of the client.
- * @param message The actual message.
- */
-static void
-handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
-{
- const struct GNUNET_MESH_LocalMonitor *msg;
- struct GNUNET_MESH_LocalMonitor *resp;
- struct MeshClient *c;
- struct MeshChannel *ch;
+ /* Count connections */
+ connection_count = GMC_count (peer->tunnel->connection_head);
- /* Sanity check for client registration */
- if (NULL == (c = client_get (client)))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ /* If we already have 3 (or more (?!)) connections, it's enough */
+ if (3 <= connection_count)
return;
- }
- msg = (struct GNUNET_MESH_LocalMonitor *) message;
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Received tunnel info request from client %u for tunnel %s[%X]\n",
- c->id,
- &msg->owner,
- ntohl (msg->channel_id));
-// ch = channel_get (&msg->owner, ntohl (msg->channel_id));
- ch = NULL; // FIXME
- if (NULL == ch)
+ if (peer->tunnel->state == MESH_TUNNEL_SEARCHING)
{
- /* We don't know the tunnel */
- struct GNUNET_MESH_LocalMonitor warn;
-
- warn = *msg;
- GNUNET_SERVER_notification_context_unicast (nc, client,
- &warn.header,
- GNUNET_NO);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- return;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
+ peer_connect (peer);
}
-
- /* Initialize context */
- resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
- *resp = *msg;
- resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
- GNUNET_SERVER_notification_context_unicast (nc, c->handle,
- &resp->header, GNUNET_NO);
- GNUNET_free (resp);
-
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Monitor tunnel request from client %u completed\n",
- c->id);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ return;
}
-/**
- * Functions to handle messages from clients
- */
-static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
- {&handle_local_new_client, NULL,
- GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
- {&handle_local_channel_create, NULL,
- GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE,
- sizeof (struct GNUNET_MESH_ChannelMessage)},
- {&handle_local_channel_destroy, NULL,
- GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY,
- sizeof (struct GNUNET_MESH_ChannelMessage)},
- {&handle_local_data, NULL,
- GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
- {&handle_local_ack, NULL,
- GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
- sizeof (struct GNUNET_MESH_LocalAck)},
- {&handle_local_get_tunnels, NULL,
- GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
- sizeof (struct GNUNET_MessageHeader)},
- {&handle_local_show_tunnel, NULL,
- GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
- sizeof (struct GNUNET_MESH_LocalMonitor)},
- {NULL, NULL, 0, 0}
-};
-
/**
* Method called whenever a given peer connects.
}
GNUNET_CONTAINER_multihashmap_iterate (pi->connections,
- connection_broken,
+ GMC_notify_broken,
pi);
GNUNET_CONTAINER_multihashmap_destroy (pi->connections);
pi->connections = NULL;
}
-/**
- * Install server (service) handlers and start listening to clients.
- */
-static void
-server_init (void)
-{
- GNUNET_SERVER_add_handlers (server_handle, client_handlers);
- GNUNET_SERVER_connect_notify (server_handle,
- &handle_local_client_connect, NULL);
- GNUNET_SERVER_disconnect_notify (server_handle,
- &handle_local_client_disconnect, NULL);
- nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
-
- clients_head = NULL;
- clients_tail = NULL;
- next_client_id = 0;
- GNUNET_SERVER_resume (server_handle);
-}
-
/**
* To be called on core init/fail.
GNUNET_DHT_disconnect (dht_handle);
dht_handle = NULL;
}
- if (nc != NULL)
- {
- GNUNET_SERVER_notification_context_destroy (nc);
- nc = NULL;
- }
+ GML_shutdown ();
if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
{
GNUNET_SCHEDULER_cancel (announce_id_task);
struct GNUNET_CRYPTO_EccPrivateKey *pk;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
- server_handle = server;
- GNUNET_SERVER_suspend (server_handle);
-
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_CONNECTION_TIME",
- &refresh_connection_time))
- {
- GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
- "MESH", "REFRESH_CONNECTION_TIME", "MISSING");
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
return;
}
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
- &max_msgs_queue))
- {
- GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
- "MESH", "MAX_MSGS_QUEUE", "MISSING");
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_CONNECTIONS",
- &max_connections))
- {
- GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
- "MESH", "MAX_CONNECTIONS", "MISSING");
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
-
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
&default_ttl))
dht_replication_level = 3;
}
- connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES);
peers = GNUNET_CONTAINER_multipeermap_create (32, GNUNET_NO);
- ports = GNUNET_CONTAINER_multihashmap32_create (32);
dht_handle = GNUNET_DHT_connect (c, 64);
if (NULL == dht_handle)
"Mesh for peer [%s] starting\n",
GNUNET_i2s(&my_full_id));
+ GML_init (server);
+ GMC_init (c);
+
core_handle = GNUNET_CORE_connect (c, /* Main configuration */
NULL, /* Closure passed to MESH functions */
&core_init, /* Call core_init once connected */
--- /dev/null
+/*
+ This file is part of GNUnet.
+ (C) 2001-2013 Christian Grothoff (and other contributing authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file mesh/gnunet-service-mesh_connection.c
+ * @brief GNUnet MESH service connection handling
+ * @author Bartlomiej Polot
+ */
+
+#include "platform.h"
+#include "gnunet_core_service.h"
+#include "gnunet-service-mesh_connection.h"
+
+
+
+
+/**
+ * All the states a connection can be in.
+ */
+enum MeshConnectionState
+{
+ /**
+ * Uninitialized status, should never appear in operation.
+ */
+ MESH_CONNECTION_NEW,
+
+ /**
+ * Connection create message sent, waiting for ACK.
+ */
+ MESH_CONNECTION_SENT,
+
+ /**
+ * Connection ACK sent, waiting for ACK.
+ */
+ MESH_CONNECTION_ACK,
+
+ /**
+ * Connection confirmed, ready to carry traffic.
+ */
+ MESH_CONNECTION_READY,
+};
+
+
+
+/**
+ * Struct containing info about a queued transmission to this peer
+ */
+struct MeshPeerQueue
+{
+ /**
+ * DLL next
+ */
+ struct MeshPeerQueue *next;
+
+ /**
+ * DLL previous
+ */
+ struct MeshPeerQueue *prev;
+
+ /**
+ * Peer this transmission is directed to.
+ */
+ struct MeshPeer *peer;
+
+ /**
+ * Connection this message belongs to.
+ */
+ struct MeshConnection *c;
+
+ /**
+ * Is FWD in c?
+ */
+ int fwd;
+
+ /**
+ * Channel this message belongs to, if known.
+ */
+ struct MeshChannel *ch;
+
+ /**
+ * Pointer to info stucture used as cls.
+ */
+ void *cls;
+
+ /**
+ * Type of message
+ */
+ uint16_t type;
+
+ /**
+ * Size of the message
+ */
+ size_t size;
+};
+
+
+/**
+ * Struct to encapsulate all the Flow Control information to a peer to which
+ * we are directly connected (on a core level).
+ */
+struct MeshFlowControl
+{
+ /**
+ * Connection this controls.
+ */
+ struct MeshConnection *c;
+
+ /**
+ * How many messages are in the queue on this connection.
+ */
+ unsigned int queue_n;
+
+ /**
+ * How many messages do we accept in the queue.
+ */
+ unsigned int queue_max;
+
+ /**
+ * Next ID to use.
+ */
+ 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;
+
+ /**
+ * 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.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier poll_task;
+
+ /**
+ * How frequently to poll for ACKs.
+ */
+ struct GNUNET_TIME_Relative poll_time;
+};
+
+
+/**
+ * Struct containing all information regarding a connection to a peer.
+ */
+struct MeshConnection
+{
+ /**
+ * DLL
+ */
+ struct MeshConnection *next;
+ struct MeshConnection *prev;
+
+ /**
+ * Tunnel this connection is part of.
+ */
+ struct MeshTunnel2 *t;
+
+ /**
+ * Flow control information for traffic fwd.
+ */
+ struct MeshFlowControl fwd_fc;
+
+ /**
+ * Flow control information for traffic bck.
+ */
+ struct MeshFlowControl bck_fc;
+
+ /**
+ * ID of the connection.
+ */
+ struct GNUNET_HashCode id;
+
+ /**
+ * State of the connection.
+ */
+ enum MeshConnectionState state;
+
+ /**
+ * Path being used for the tunnel.
+ */
+ struct MeshPeerPath *path;
+
+ /**
+ * Position of the local peer in the path.
+ */
+ unsigned int own_pos;
+
+ /**
+ * Task to keep the used paths alive at the owner,
+ * time tunnel out on all the other peers.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier fwd_maintenance_task;
+
+ /**
+ * Task to keep the used paths alive at the destination,
+ * time tunnel out on all the other peers.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier bck_maintenance_task;
+
+ /**
+ * Pending message count.
+ */
+ int pending_messages;
+
+ /**
+ * Destroy flag: if true, destroy on last message.
+ */
+ int destroy;
+};
+
+
+
+
+
+
+/**
+ * Connections known, indexed by cid (MeshConnection).
+ */
+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;
+
+
+
+
+/**
+ * Initialize a Flow Control structure to the initial state.
+ *
+ * @param fc Flow Control structure to initialize.
+ */
+static void
+fc_init (struct MeshFlowControl *fc)
+{
+ fc->next_pid = 0;
+ fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
+ fc->last_pid_recv = (uint32_t) -1;
+ fc->last_ack_sent = (uint32_t) 0;
+ fc->last_ack_recv = (uint32_t) 0;
+ fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
+ 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.
+ */
+static struct MeshConnection *
+connection_get (const struct GNUNET_HashCode *cid)
+{
+ return GNUNET_CONTAINER_multihashmap_get (connections, cid);
+}
+
+
+/**
+ * Get first sendable message.
+ *
+ * @param peer The destination peer.
+ *
+ * @return Best current known path towards the peer, if any.
+ */
+static struct MeshPeerQueue *
+peer_get_first_message (const struct MeshPeer *peer)
+{
+ struct MeshPeerQueue *q;
+
+ for (q = peer->queue_head; NULL != q; q = q->next)
+ {
+ if (queue_is_sendable (q))
+ return q;
+ }
+
+ return NULL;
+}
+
+
+static int
+queue_is_sendable (struct MeshPeerQueue *q)
+{
+ struct MeshFlowControl *fc;
+
+ /* Is PID-independent? */
+ switch (q->type)
+ {
+ case GNUNET_MESSAGE_TYPE_MESH_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_POLL:
+ return GNUNET_YES;
+ }
+
+ /* Is PID allowed? */
+ fc = q->fwd ? &q->c->fwd_fc : &q->c->bck_fc;
+ if (GMC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
+ return GNUNET_YES;
+
+ return GNUNET_NO;
+}
+
+
+
+/**
+ * Free a transmission that was already queued with all resources
+ * associated to the request.
+ *
+ * @param queue Queue handler to cancel.
+ * @param clear_cls Is it necessary to free associated cls?
+ */
+static void
+queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
+{
+ struct MeshPeer *peer;
+ struct MeshFlowControl *fc;
+ int fwd;
+
+ fwd = queue->fwd;
+ peer = queue->peer;
+ GNUNET_assert (NULL != queue->c);
+ fc = fwd ? &queue->c->fwd_fc : &queue->c->bck_fc;
+
+ if (GNUNET_YES == clear_cls)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " queue destroy type %s\n",
+ GNUNET_MESH_DEBUG_M2S (queue->type));
+ switch (queue->type)
+ {
+ case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
+ case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
+ GNUNET_break (GNUNET_YES == queue->c->destroy);
+ /* fall through */
+ case GNUNET_MESSAGE_TYPE_MESH_FWD:
+ case GNUNET_MESSAGE_TYPE_MESH_BCK:
+ case GNUNET_MESSAGE_TYPE_MESH_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_POLL:
+ case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
+ case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prebuilt message\n");;
+ GNUNET_free_non_null (queue->cls);
+ break;
+
+ default:
+ GNUNET_break (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
+ GNUNET_MESH_DEBUG_M2S (queue->type));
+ }
+
+ }
+ GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
+
+ if (queue->type != GNUNET_MESSAGE_TYPE_MESH_ACK &&
+ queue->type != GNUNET_MESSAGE_TYPE_MESH_POLL)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Q_N- %p %u\n", fc, fc->queue_n);
+ fc->queue_n--;
+ peer->queue_n--;
+ }
+ if (NULL != queue->c)
+ {
+ queue->c->pending_messages--;
+ if (NULL != queue->c->t)
+ {
+ queue->c->t->pending_messages--;
+ }
+ }
+
+ GNUNET_free (queue);
+}
+
+
+
+static size_t
+queue_send (void *cls, size_t size, void *buf)
+{
+ struct MeshPeer *peer = cls;
+ struct MeshFlowControl *fc;
+ struct MeshConnection *c;
+ struct GNUNET_MessageHeader *msg;
+ struct MeshPeerQueue *queue;
+ struct MeshTunnel2 *t;
+ struct MeshChannel *ch;
+ const struct GNUNET_PeerIdentity *dst_id;
+ size_t data_size;
+ uint32_t pid;
+ uint16_t type;
+ int fwd;
+
+ peer->core_transmit = NULL;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send (max %u)\n", size);
+
+ if (NULL == buf || 0 == size)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n");
+ return 0;
+ }
+
+ /* Initialize */
+ queue = peer_get_first_message (peer);
+ if (NULL == queue)
+ {
+ GNUNET_break (0); /* Core tmt_rdy should've been canceled */
+ return 0;
+ }
+ c = queue->c;
+ fwd = queue->fwd;
+ fc = fwd ? &c->fwd_fc : &c->bck_fc;
+
+ dst_id = GNUNET_PEER_resolve2 (peer->id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* towards %s\n", GNUNET_i2s (dst_id));
+ /* Check if buffer size is enough for the message */
+ if (queue->size > size)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not enough room, reissue\n");
+ peer->core_transmit =
+ GNUNET_CORE_notify_transmit_ready (core_handle,
+ GNUNET_NO,
+ 0,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ dst_id,
+ queue->size,
+ &queue_send,
+ peer);
+ return 0;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size %u ok\n", queue->size);
+
+ t = (NULL != c) ? c->t : NULL;
+ type = 0;
+
+ /* Fill buf */
+ switch (queue->type)
+ {
+ case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
+ case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
+ case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
+ case GNUNET_MESSAGE_TYPE_MESH_FWD:
+ case GNUNET_MESSAGE_TYPE_MESH_BCK:
+ case GNUNET_MESSAGE_TYPE_MESH_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_POLL:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "* raw: %s\n",
+ GNUNET_MESH_DEBUG_M2S (queue->type));
+ data_size = send_core_data_raw (queue->cls, size, buf);
+ msg = (struct GNUNET_MessageHeader *) buf;
+ type = ntohs (msg->type);
+ break;
+ case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
+ if (GMC_is_origin (c, GNUNET_YES))
+ data_size = send_core_connection_create (queue->c, size, buf);
+ else
+ data_size = send_core_data_raw (queue->cls, size, buf);
+ break;
+ case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
+ if (GMC_is_origin (c, GNUNET_NO) ||
+ GMC_is_origin (c, GNUNET_YES))
+ data_size = send_core_connection_ack (queue->c, size, buf);
+ else
+ data_size = send_core_data_raw (queue->cls, size, buf);
+ break;
+ case GNUNET_MESSAGE_TYPE_MESH_DATA:
+ case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
+ case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
+ /* This should be encapsulted */
+ GNUNET_break (0);
+ data_size = 0;
+ break;
+ default:
+ GNUNET_break (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "* type unknown: %u\n",
+ queue->type);
+ data_size = 0;
+ }
+
+ if (0 < drop_percent &&
+ GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Dropping message of type %s\n",
+ GNUNET_MESH_DEBUG_M2S (queue->type));
+ data_size = 0;
+ }
+
+ /* Free queue, but cls was freed by send_core_* */
+ ch = queue->ch;
+ queue_destroy (queue, GNUNET_NO);
+
+ /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
+ switch (type)
+ {
+ case GNUNET_MESSAGE_TYPE_MESH_FWD:
+ case GNUNET_MESSAGE_TYPE_MESH_BCK:
+ pid = ntohl ( ((struct GNUNET_MESH_Encrypted *) buf)->pid );
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* accounting pid %u\n", pid);
+ fc->last_pid_sent = pid;
+ send_ack (c, ch, fwd);
+ break;
+ default:
+ break;
+ }
+
+ /* If more data in queue, send next */
+ queue = peer_get_first_message (peer);
+ if (NULL != queue)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
+ if (NULL == peer->core_transmit) {
+ peer->core_transmit =
+ GNUNET_CORE_notify_transmit_ready(core_handle,
+ 0,
+ 0,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ dst_id,
+ queue->size,
+ &queue_send,
+ peer);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "* tmt rdy called somewhere else\n");
+ }
+ if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* starting poll timeout\n");
+ fc->poll_task =
+ GNUNET_SCHEDULER_add_delayed (fc->poll_time, &connection_poll, fc);
+ }
+ }
+ else
+ {
+ if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
+ {
+ GNUNET_SCHEDULER_cancel (fc->poll_task);
+ fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ }
+ if (NULL != c)
+ {
+ c->pending_messages--;
+ if (GNUNET_YES == c->destroy && 0 == c->pending_messages)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying connection!\n");
+ GMC_destroy (c);
+ }
+ }
+
+ if (NULL != t)
+ {
+ t->pending_messages--;
+ if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
+ {
+// GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
+ tunnel_destroy (t);
+ }
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
+ return data_size;
+}
+
+
+
+static void
+queue_add (void *cls, uint16_t type, size_t size,
+ struct MeshConnection *c,
+ struct MeshChannel *ch,
+ int fwd)
+{
+ struct MeshPeerQueue *queue;
+ struct MeshFlowControl *fc;
+ struct MeshPeer *peer;
+ int priority;
+ int call_core;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "queue add %s %s (%u) on c %p, ch %p\n",
+ fwd ? "FWD" : "BCK", GNUNET_MESH_DEBUG_M2S (type), size, c, ch);
+ GNUNET_assert (NULL != c);
+
+ fc = fwd ? &c->fwd_fc : &c->bck_fc;
+ peer = fwd ? connection_get_next_hop (c) : connection_get_prev_hop (c);
+
+ if (NULL == fc)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ if (NULL == peer->connections)
+ {
+ /* We are not connected to this peer, ignore request. */
+ GNUNET_break_op (0);
+ return;
+ }
+
+ priority = 0;
+
+ if (GNUNET_MESSAGE_TYPE_MESH_POLL == type ||
+ GNUNET_MESSAGE_TYPE_MESH_ACK == type)
+ {
+ priority = 100;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "fc %p\n", fc);
+ if (fc->queue_n >= fc->queue_max && 0 == priority)
+ {
+ GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
+ 1, GNUNET_NO);
+ GNUNET_break (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "queue full: %u/%u\n",
+ fc->queue_n, fc->queue_max);
+ return; /* Drop this message */
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "last pid %u\n", fc->last_pid_sent);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", fc->last_ack_recv);
+ if (GMC_is_pid_bigger (fc->last_pid_sent + 1, fc->last_ack_recv))
+ {
+ call_core = GNUNET_NO;
+ if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task &&
+ GNUNET_MESSAGE_TYPE_MESH_POLL != type)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "no buffer space (%u > %u): starting poll\n",
+ fc->last_pid_sent + 1, fc->last_ack_recv);
+ fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
+ &connection_poll,
+ fc);
+ }
+ }
+ else
+ call_core = GNUNET_YES;
+ queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
+ queue->cls = cls;
+ queue->type = type;
+ queue->size = size;
+ queue->peer = peer;
+ queue->c = c;
+ queue->ch = ch;
+ queue->fwd = fwd;
+ if (100 <= priority)
+ {
+ struct MeshPeerQueue *copy;
+ struct MeshPeerQueue *next;
+
+ for (copy = peer->queue_head; NULL != copy; copy = next)
+ {
+ next = copy->next;
+ if (copy->type == type && copy->c == c && copy->fwd == fwd)
+ {
+ /* Example: also a FWD ACK for connection XYZ */
+ queue_destroy (copy, GNUNET_YES);
+ }
+ }
+ GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, queue);
+ }
+ else
+ {
+ GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, queue);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Q_N+ %p %u\n", fc, fc->queue_n);
+ fc->queue_n++;
+ peer->queue_n++;
+ }
+
+ if (NULL == peer->core_transmit && GNUNET_YES == call_core)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "calling core tmt rdy towards %s for %u bytes\n",
+ peer2s (peer), size);
+ peer->core_transmit =
+ GNUNET_CORE_notify_transmit_ready (core_handle,
+ 0,
+ 0,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ GNUNET_PEER_resolve2 (peer->id),
+ size,
+ &queue_send,
+ peer);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "core tmt rdy towards %s already called\n",
+ peer2s (peer));
+
+ }
+ c->pending_messages++;
+ if (NULL != c->t)
+ c->t->pending_messages++;
+}
+
+
+
+
+/**
+ * Sends an already built message on a connection, properly registering
+ * all used resources.
+ *
+ * @param message Message to send. Function makes a copy of it.
+ * If message is not hop-by-hop, decrements TTL of copy.
+ * @param c Connection on which this message is transmitted.
+ * @param ch Channel on which this message is transmitted, or NULL.
+ * @param fwd Is this a fwd message?
+ */
+static void
+send_prebuilt_message_connection (const struct GNUNET_MessageHeader *message,
+ struct MeshConnection *c,
+ struct MeshChannel *ch,
+ int fwd)
+{
+ void *data;
+ size_t size;
+ uint16_t type;
+
+ size = ntohs (message->size);
+ data = GNUNET_malloc (size);
+ memcpy (data, message, size);
+ type = ntohs (message->type);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send %s (%u) on connection %s\n",
+ GNUNET_MESH_DEBUG_M2S (type), size, GNUNET_h2s (&c->id));
+
+ switch (type)
+ {
+ struct GNUNET_MESH_Encrypted *emsg;
+ struct GNUNET_MESH_ACK *amsg;
+ struct GNUNET_MESH_Poll *pmsg;
+ struct GNUNET_MESH_ConnectionDestroy *dmsg;
+ struct GNUNET_MESH_ConnectionBroken *bmsg;
+ uint32_t ttl;
+
+ case GNUNET_MESSAGE_TYPE_MESH_FWD:
+ case GNUNET_MESSAGE_TYPE_MESH_BCK:
+ emsg = (struct GNUNET_MESH_Encrypted *) data;
+ ttl = ntohl (emsg->ttl);
+ if (0 == ttl)
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ emsg->cid = c->id;
+ emsg->ttl = htonl (ttl - 1);
+ emsg->pid = htonl (fwd ? c->fwd_fc.next_pid++ : c->bck_fc.next_pid++);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " pid %u\n", ntohl (emsg->pid));
+ break;
+
+ case GNUNET_MESSAGE_TYPE_MESH_ACK:
+ amsg = (struct GNUNET_MESH_ACK *) data;
+ amsg->cid = c->id;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ntohl (amsg->ack));
+ break;
+
+ case GNUNET_MESSAGE_TYPE_MESH_POLL:
+ pmsg = (struct GNUNET_MESH_Poll *) data;
+ pmsg->cid = c->id;
+ pmsg->pid = htonl (fwd ? c->fwd_fc.last_pid_sent : c->bck_fc.last_pid_sent);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " poll %u\n", ntohl (pmsg->pid));
+ break;
+
+ case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
+ dmsg = (struct GNUNET_MESH_ConnectionDestroy *) data;
+ dmsg->cid = c->id;
+ dmsg->reserved = 0;
+ break;
+
+ case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
+ bmsg = (struct GNUNET_MESH_ConnectionBroken *) data;
+ bmsg->cid = c->id;
+ bmsg->reserved = 0;
+ break;
+
+ case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
+ case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
+ break;
+
+ default:
+ GNUNET_break (0);
+ }
+
+ queue_add (data,
+ type,
+ size,
+ c,
+ ch,
+ fwd);
+}
+
+
+
+
+struct MeshConnection *
+GMC_new (const struct GNUNET_HashCode *cid)
+{
+ struct MeshConnection *c;
+
+ c = GNUNET_new (struct MeshConnection);
+ c->id = *cid;
+ GNUNET_CONTAINER_multihashmap_put (connections, &c->id, c,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
+ fc_init (&c->fwd_fc);
+ fc_init (&c->bck_fc);
+ c->fwd_fc.c = c;
+ c->bck_fc.c = c;
+
+ return c;
+}
+
+
+static void
+GMC_destroy (struct MeshConnection *c)
+{
+ struct MeshPeer *peer;
+
+ if (NULL == c)
+ return;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s[%X]\n",
+ peer2s (c->t->peer),
+ c->id);
+
+ /* Cancel all traffic */
+ connection_cancel_queues (c, GNUNET_YES);
+ connection_cancel_queues (c, GNUNET_NO);
+
+ /* Cancel maintainance task (keepalive/timeout) */
+ if (GNUNET_SCHEDULER_NO_TASK != c->fwd_maintenance_task)
+ GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
+ if (GNUNET_SCHEDULER_NO_TASK != c->bck_maintenance_task)
+ GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
+
+ /* Deregister from neighbors */
+ peer = connection_get_next_hop (c);
+ if (NULL != peer && NULL != peer->connections)
+ GNUNET_CONTAINER_multihashmap_remove (peer->connections, &c->id, c);
+ peer = connection_get_prev_hop (c);
+ if (NULL != peer && NULL != peer->connections)
+ GNUNET_CONTAINER_multihashmap_remove (peer->connections, &c->id, c);
+
+ /* Delete */
+ GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO);
+ GNUNET_CONTAINER_DLL_remove (c->t->connection_head, c->t->connection_tail, c);
+ GNUNET_free (c);
+}
+
+
+
+/**
+ * Send an ACK informing the predecessor about the available buffer space.
+ *
+ * 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->owner)
+ */
+static void
+connection_send_ack (struct MeshConnection *c, unsigned int buffer, int fwd)
+{
+ struct MeshFlowControl *next_fc;
+ struct MeshFlowControl *prev_fc;
+ struct GNUNET_MESH_ACK msg;
+ uint32_t ack;
+ int delta;
+
+ next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
+ prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "connection send %s ack on %s\n",
+ fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id));
+
+ /* Check if we need to transmit the ACK */
+ if (prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " last pid recv: %u, last ack sent: %u\n",
+ prev_fc->last_pid_recv, prev_fc->last_ack_sent);
+ return;
+ }
+
+ /* Ok, ACK might be necessary, what PID to ACK? */
+ delta = next_fc->queue_max - next_fc->queue_n;
+ ack = prev_fc->last_pid_recv + delta;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
+ GNUNET_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_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
+ return;
+ }
+
+ prev_fc->last_ack_sent = ack;
+
+ /* Build ACK message and send on connection */
+ msg.header.size = htons (sizeof (msg));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
+ msg.ack = htonl (ack);
+ msg.cid = c->id;
+
+ send_prebuilt_message_connection (&msg.header, c, NULL, !fwd);
+}
+
+
+static void
+connection_change_state (struct MeshConnection* c,
+ enum MeshConnectionState state)
+{
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Connection %s state was %s\n",
+ GNUNET_h2s (&c->id), GNUNET_MESH_DEBUG_CS2S (c->state));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Connection %s state is now %s\n",
+ GNUNET_h2s (&c->id), GNUNET_MESH_DEBUG_CS2S (state));
+ c->state = state;
+}
+
+
+
+/**
+ * Send keepalive packets for a connection.
+ *
+ * @param c Connection to keep alive..
+ * @param fwd Is this a FWD keepalive? (owner -> dest).
+ */
+static void
+connection_keepalive (struct MeshConnection *c, int fwd)
+{
+ struct GNUNET_MESH_ConnectionKeepAlive *msg;
+ size_t size = sizeof (struct GNUNET_MESH_ConnectionKeepAlive);
+ char cbuf[size];
+ uint16_t type;
+
+ type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE :
+ GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "sending %s keepalive for connection %s[%d]\n",
+ fwd ? "FWD" : "BCK",
+ peer2s (c->t->peer),
+ c->id);
+
+ msg = (struct GNUNET_MESH_ConnectionKeepAlive *) cbuf;
+ msg->header.size = htons (size);
+ msg->header.type = htons (type);
+ msg->cid = c->id;
+
+ send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
+}
+
+
+/**
+ * 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 MeshConnection *c, int fwd)
+{
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
+ if (fwd)
+ send_connection_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 MeshConnection *c, int fwd)
+{
+ if (MESH_TUNNEL_SEARCHING == c->t->state)
+ {
+ /* TODO DHT GET with RO_BART */
+ return;
+ }
+ switch (c->state)
+ {
+ case MESH_CONNECTION_NEW:
+ GNUNET_break (0);
+ case MESH_CONNECTION_SENT:
+ connection_recreate (c, fwd);
+ break;
+ case MESH_CONNECTION_READY:
+ connection_keepalive (c, fwd);
+ break;
+ default:
+ break;
+ }
+}
+
+
+static void
+connection_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MeshConnection *c = cls;
+
+ c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+
+ connection_maintain (c, GNUNET_YES);
+ c->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
+ &connection_fwd_keepalive,
+ c);
+}
+
+
+static void
+connection_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MeshConnection *c = cls;
+
+ c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+
+ connection_maintain (c, GNUNET_NO);
+ c->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
+ &connection_bck_keepalive,
+ c);
+}
+
+
+/**
+ * Send a message to all peers in this connection that the connection
+ * is no longer valid.
+ *
+ * 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.
+ */
+static void
+connection_send_destroy (struct MeshConnection *c)
+{
+ struct GNUNET_MESH_ConnectionDestroy msg;
+
+ msg.header.size = htons (sizeof (msg));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);;
+ msg.cid = c->id;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " sending connection destroy for connection %s[%X]\n",
+ peer2s (c->t->peer),
+ c->id);
+
+ if (GNUNET_NO == GMC_is_terminal (c, GNUNET_YES))
+ send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_YES);
+ if (GNUNET_NO == GMC_is_terminal (c, GNUNET_NO))
+ send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_NO);
+ c->destroy = GNUNET_YES;
+}
+
+
+/**
+ * Get free buffer space in a connection.
+ *
+ * @param c Connection.
+ * @param fwd Is query about FWD traffic?
+ *
+ * @return Free buffer space [0 - max_msgs_queue/max_connections]
+ */
+static unsigned int
+connection_get_buffer (struct MeshConnection *c, int fwd)
+{
+ struct MeshFlowControl *fc;
+
+ fc = fwd ? &c->fwd_fc : &c->bck_fc;
+
+ return (fc->queue_max - fc->queue_n);
+}
+
+
+/**
+ * Get the first transmittable message for a connection.
+ *
+ * @param c Connection.
+ * @param fwd Is this FWD?
+ *
+ * @return First transmittable message.
+ */
+static struct MeshPeerQueue *
+connection_get_first_message (struct MeshConnection *c, int fwd)
+{
+ struct MeshPeerQueue *q;
+ struct MeshPeer *p;
+
+ p = connection_get_hop (c, fwd);
+
+ for (q = p->queue_head; NULL != q; q = q->next)
+ {
+ if (q->c != c)
+ continue;
+ if (queue_is_sendable (q))
+ return q;
+ }
+
+ return NULL;
+}
+
+
+/**
+ * @brief Re-initiate traffic on this connection if necessary.
+ *
+ * Check if there is traffic queued towards this peer
+ * and the core transmit handle is NULL (traffic was stalled).
+ * If so, call core tmt rdy.
+ *
+ * @param c Connection on which initiate traffic.
+ * @param fwd Is this about fwd traffic?
+ */
+static void
+connection_unlock_queue (struct MeshConnection *c, int fwd)
+{
+ struct MeshPeer *peer;
+ struct MeshPeerQueue *q;
+ size_t size;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "connection_unlock_queue %s on %s\n",
+ fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id));
+
+ if (GMC_is_terminal (c, fwd))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " is terminal!\n");
+ return;
+ }
+
+ peer = connection_get_hop (c, fwd);
+
+ if (NULL != peer->core_transmit)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
+ return; /* Already unlocked */
+ }
+
+ q = connection_get_first_message (c, fwd);
+ if (NULL == q)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
+ return; /* Nothing to transmit */
+ }
+
+ size = q->size;
+ peer->core_transmit =
+ GNUNET_CORE_notify_transmit_ready (core_handle,
+ GNUNET_NO,
+ 0,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ GNUNET_PEER_resolve2 (peer->id),
+ size,
+ &queue_send,
+ peer);
+}
+
+
+/**
+ * Cancel all transmissions that belong to a certain connection.
+ *
+ * @param c Connection which to cancel.
+ * @param fwd Cancel fwd traffic?
+ */
+static void
+connection_cancel_queues (struct MeshConnection *c, int fwd)
+{
+ struct MeshPeerQueue *q;
+ struct MeshPeerQueue *next;
+ struct MeshFlowControl *fc;
+ struct MeshPeer *peer;
+
+ if (NULL == c)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ fc = fwd ? &c->fwd_fc : &c->bck_fc;
+ peer = connection_get_hop (c, fwd);
+
+ for (q = peer->queue_head; NULL != q; q = next)
+ {
+ next = q->next;
+ if (q->c == c)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "connection_cancel_queue %s\n",
+ GNUNET_MESH_DEBUG_M2S (q->type));
+ queue_destroy (q, GNUNET_YES);
+ }
+ }
+ if (NULL == peer->queue_head)
+ {
+ if (NULL != peer->core_transmit)
+ {
+ GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
+ peer->core_transmit = NULL;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
+ {
+ GNUNET_SCHEDULER_cancel (fc->poll_task);
+ fc->poll_task = GNUNET_SCHEDULER_NO_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).
+ * @param tc TaskContext.
+ */
+static void
+connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MeshFlowControl *fc = cls;
+ struct GNUNET_MESH_Poll msg;
+ struct MeshConnection *c;
+
+ fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ {
+ return;
+ }
+
+ c = fc->c;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** connection [%X]\n",
+ GNUNET_h2s (&c->id));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** %s\n",
+ fc == &c->fwd_fc ? "FWD" : "BCK");
+
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
+ msg.header.size = htons (sizeof (msg));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** pid (%u)!\n", fc->last_pid_sent);
+ send_prebuilt_message_connection (&msg.header, c, NULL, fc == &c->fwd_fc);
+ fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
+ fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
+ &connection_poll, fc);
+}
+
+
+
+
+/**
+ * Get the previous hop in a connection
+ *
+ * @param c Connection.
+ *
+ * @return Previous peer in the connection.
+ */
+static struct MeshPeer *
+connection_get_prev_hop (struct MeshConnection *c)
+{
+ GNUNET_PEER_Id id;
+
+ if (0 == c->own_pos || c->path->length < 2)
+ id = c->path->peers[0];
+ else
+ id = c->path->peers[c->own_pos - 1];
+
+ return peer_get_short (id);
+}
+
+
+/**
+ * Get the next hop in a connection
+ *
+ * @param c Connection.
+ *
+ * @return Next peer in the connection.
+ */
+static struct MeshPeer *
+connection_get_next_hop (struct MeshConnection *c)
+{
+ GNUNET_PEER_Id id;
+
+ 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];
+
+ return peer_get_short (id);
+}
+
+
+/**
+ * Get the hop in a connection.
+ *
+ * @param c Connection.
+ * @param fwd Next hop?
+ *
+ * @return Next peer in the connection.
+ */
+static struct MeshPeer *
+connection_get_hop (struct MeshConnection *c, int fwd)
+{
+ if (fwd)
+ return connection_get_next_hop (c);
+ return connection_get_prev_hop (c);
+}
+
+
+
+
+/**
+ * Timeout function due to lack of keepalive/traffic from the owner.
+ * Destroys connection if called.
+ *
+ * @param cls Closure (connection to destroy).
+ * @param tc TaskContext.
+ */
+static void
+connection_fwd_timeout (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MeshConnection *c = cls;
+
+ c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Connection %s[%X] FWD timed out. Destroying.\n",
+ peer2s (c->t->peer),
+ c->id);
+
+ if (GMC_is_origin (c, GNUNET_YES)) /* If local, leave. */
+ return;
+
+ GMC_destroy (c);
+}
+
+
+/**
+ * Timeout function due to lack of keepalive/traffic from the destination.
+ * Destroys connection if called.
+ *
+ * @param cls Closure (connection to destroy).
+ * @param tc TaskContext
+ */
+static void
+connection_bck_timeout (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MeshConnection *c = cls;
+
+ c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Connection %s[%X] FWD timed out. Destroying.\n",
+ peer2s (c->t->peer),
+ c->id);
+
+ if (GMC_is_origin (c, GNUNET_NO)) /* If local, leave. */
+ return;
+
+ GMC_destroy (c);
+}
+
+
+/**
+ * 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 tiemout 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 MeshConnection *c, int fwd)
+{
+ GNUNET_SCHEDULER_TaskIdentifier *ti;
+ GNUNET_SCHEDULER_Task f;
+
+ ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
+
+ if (GNUNET_SCHEDULER_NO_TASK != *ti)
+ GNUNET_SCHEDULER_cancel (*ti);
+
+ if (GMC_is_origin (c, fwd)) /* Endpoint */
+ {
+ f = fwd ? &connection_fwd_keepalive : &connection_bck_keepalive;
+ *ti = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, f, c);
+ }
+ else /* Relay */
+ {
+ struct GNUNET_TIME_Relative delay;
+
+ delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
+ f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
+ *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
+ }
+}
+
+
+/**
+ * Iterator to notify all connections of a broken link. Mark connections
+ * to destroy after all traffic has been sent.
+ *
+ * @param cls Closure (peer disconnected).
+ * @param key Current key code (tid).
+ * @param value Value in the hash map (connection).
+ *
+ * @return GNUNET_YES if we should continue to iterate,
+ * GNUNET_NO if not.
+ */
+int
+GMC_notify_broken (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
+{
+ struct MeshPeer *peer = cls;
+ struct MeshConnection *c = value;
+ struct GNUNET_MESH_ConnectionBroken msg;
+ int fwd;
+
+ fwd = peer == connection_get_prev_hop (c);
+
+ connection_cancel_queues (c, !fwd);
+ if (GMC_is_terminal (c, fwd))
+ {
+ /* Local shutdown, no one to notify about this. */
+ GMC_destroy (c);
+ return GNUNET_YES;
+ }
+
+ msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectionBroken));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN);
+ msg.cid = c->id;
+ msg.peer1 = my_full_id;
+ msg.peer2 = *GNUNET_PEER_resolve2 (peer->id);
+ send_prebuilt_message_connection (&msg.header, c, NULL, fwd);
+ c->destroy = GNUNET_YES;
+
+ return GNUNET_YES;
+}
+
+
+/**
+ * Initialize the connections subsystem
+ *
+ * @param c Configuration handle.
+ */
+void
+GMC_init (struct GNUNET_CONFIGURATION_Handle *c)
+{
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
+ &max_msgs_queue))
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "MESH", "MAX_MSGS_QUEUE", "MISSING");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_CONNECTIONS",
+ &max_connections))
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "MESH", "MAX_CONNECTIONS", "MISSING");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_CONNECTION_TIME",
+ &refresh_connection_time))
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "MESH", "REFRESH_CONNECTION_TIME", "MISSING");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ connections = GNUNET_CONTAINER_multihashmap_create (1024, GNUNET_YES);
+}
+
+
+/**
+ * Is this peer the first one on the connection?
+ *
+ * @param c Connection.
+ * @param fwd Is this about fwd traffic?
+ *
+ * @return GNUNET_YES if origin, GNUNET_NO if relay/terminal.
+ */
+int
+GMC_is_origin (struct MeshConnection *c, int fwd)
+{
+ if (!fwd && c->path->length - 1 == c->own_pos )
+ return GNUNET_YES;
+ if (fwd && 0 == c->own_pos)
+ return GNUNET_YES;
+ return GNUNET_NO;
+}
+
+
+/**
+ * Is this peer the last one on the connection?
+ *
+ * @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.
+ */
+int
+GMC_is_terminal (struct MeshConnection *c, int fwd)
+{
+ return GMC_is_origin (c, !fwd);
+}
\ No newline at end of file
projects / oweals / gnunet.git / commitdiff