2 This file is part of GNUnet.
3 (C) 2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 #include "gnunet_util_lib.h"
24 #include "gnunet_statistics_service.h"
26 #include "mesh_protocol_enc.h"
28 #include "gnunet-service-mesh_tunnel.h"
29 #include "gnunet-service-mesh_connection.h"
30 #include "gnunet-service-mesh_channel.h"
31 #include "gnunet-service-mesh_peer.h"
32 #include "mesh_path.h"
34 #define LOG(level, ...) GNUNET_log_from(level,"mesh-tun",__VA_ARGS__)
36 #define START_FUNCTION LOG(GNUNET_ERROR_TYPE_DEBUG, "%s start\n", __FUNCTION__)
37 #define END_FUNCTION LOG(GNUNET_ERROR_TYPE_DEBUG, "%s end\n", __FUNCTION__)
40 /******************************************************************************/
41 /******************************** STRUCTS **********************************/
42 /******************************************************************************/
46 struct MeshTChannel *next;
47 struct MeshTChannel *prev;
48 struct MeshChannel *ch;
51 struct MeshTConnection
53 struct MeshTConnection *next;
54 struct MeshTConnection *prev;
55 struct MeshConnection *c;
59 * Struct containing all information regarding a tunnel to a peer.
64 * Endpoint of the tunnel.
66 struct MeshPeer *peer;
69 * State of the tunnel.
71 enum MeshTunnel3State state;
74 * Local peer ephemeral private key
76 struct GNUNET_CRYPTO_EddsaPrivateKey *my_eph_key;
79 * Local peer ephemeral public key
81 struct GNUNET_CRYPTO_EddsaPublicKey *my_eph;
84 * Remote peer's public key.
86 struct GNUNET_CRYPTO_EddsaPublicKey *peers_eph;
89 * Encryption ("our") key.
91 struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
94 * Decryption ("their") key.
96 struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
99 * Paths that are actively used to reach the destination peer.
101 struct MeshTConnection *connection_head;
102 struct MeshTConnection *connection_tail;
105 * Next connection number.
110 * Channels inside this tunnel.
112 struct MeshTChannel *channel_head;
113 struct MeshTChannel *channel_tail;
116 * Channel ID for the next created channel.
118 MESH_ChannelNumber next_chid;
121 * Pending message count.
123 int pending_messages;
126 * Destroy flag: if true, destroy on last message.
131 * Queued messages, to transmit once tunnel gets connected.
133 struct MeshTunnelQueue *tq_head;
134 struct MeshTunnelQueue *tq_tail;
139 * Struct used to queue messages in a tunnel.
141 struct MeshTunnelQueue
146 struct MeshTunnelQueue *next;
147 struct MeshTunnelQueue *prev;
152 struct MeshChannel *ch;
157 /* struct GNUNET_MessageHeader *msg; */
160 /******************************************************************************/
161 /******************************* GLOBALS ***********************************/
162 /******************************************************************************/
165 * Global handle to the statistics service.
167 extern struct GNUNET_STATISTICS_Handle *stats;
170 * Local peer own ID (memory efficient handle).
172 extern GNUNET_PEER_Id myid;
175 * Local peer own ID (full value).
177 extern struct GNUNET_PeerIdentity my_full_id;
180 * Default TTL for payload packets.
182 static unsigned long long default_ttl;
187 const static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
190 /******************************************************************************/
191 /******************************** STATIC ***********************************/
192 /******************************************************************************/
195 * Get string description for tunnel state.
197 * @param s Tunnel state.
199 * @return String representation.
202 GMT_state2s (enum MeshTunnel3State s)
204 static char buf[128];
208 case MESH_TUNNEL3_NEW:
209 return "MESH_TUNNEL3_NEW";
210 case MESH_TUNNEL3_SEARCHING:
211 return "MESH_TUNNEL3_SEARCHING";
212 case MESH_TUNNEL3_WAITING:
213 return "MESH_TUNNEL3_WAITING";
214 case MESH_TUNNEL3_READY:
215 return "MESH_TUNNEL3_READY";
216 case MESH_TUNNEL3_RECONNECTING:
217 return "MESH_TUNNEL3_RECONNECTING";
220 sprintf (buf, "%u (UNKNOWN STATE)", s);
226 * Pick a connection on which send the next data message.
228 * @param t Tunnel on which to send the message.
229 * @param fwd Is this a fwd message?
231 * @return The connection on which to send the next message.
233 static struct MeshConnection *
234 tunnel_get_connection (struct MeshTunnel3 *t, int fwd)
236 struct MeshTConnection *iter;
237 struct MeshConnection *best;
239 unsigned int lowest_q;
241 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GMP_2s (t->peer));
244 for (iter = t->connection_head; NULL != iter; iter = iter->next)
246 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
247 GNUNET_h2s (GMC_get_id (iter->c)), GMC_get_state (iter->c));
248 if (MESH_CONNECTION_READY == GMC_get_state (iter->c))
250 qn = GMC_get_qn (iter->c, fwd);
251 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
264 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
265 * Encrypt data with the tunnel key.
267 * @param t Tunnel whose key to use.
268 * @param dst Destination for the GMT_encrypted data.
269 * @param src Source of the plaintext.
270 * @param size Size of the plaintext.
271 * @param iv Initialization Vector to use.
272 * @param fwd Is this a fwd message?
275 GMT_encrypt (struct MeshTunnel3 *t,
276 void *dst, const void *src,
277 size_t size, uint64_t iv, int fwd)
279 memcpy (dst, src, size);
284 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
285 * Decrypt data with the tunnel key.
287 * @param t Tunnel whose key to use.
288 * @param dst Destination for the plaintext.
289 * @param src Source of the GMT_encrypted data.
290 * @param size Size of the GMT_encrypted data.
291 * @param iv Initialization Vector to use.
292 * @param fwd Is this a fwd message?
295 GMT_decrypt (struct MeshTunnel3 *t,
296 void *dst, const void *src,
297 size_t size, uint64_t iv, int fwd)
299 memcpy (dst, src, size);
304 handle_data (struct MeshTunnel3 *t,
305 const struct GNUNET_MESH_Data *msg,
308 struct MeshChannel *ch;
313 size = ntohs (msg->header.size);
315 sizeof (struct GNUNET_MESH_Data) +
316 sizeof (struct GNUNET_MessageHeader))
321 type = ntohs (msg->header.type);
322 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a %s message\n",
323 GNUNET_MESH_DEBUG_M2S (type));
324 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
325 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
328 ch = GMT_get_channel (t, ntohl (msg->chid));
331 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
333 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
338 GMT_change_state (t, MESH_TUNNEL3_READY);
339 GMCH_handle_data (ch, msg, fwd);
343 handle_data_ack (struct MeshTunnel3 *t,
344 const struct GNUNET_MESH_DataACK *msg,
347 struct MeshChannel *ch;
351 size = ntohs (msg->header.size);
352 if (size != sizeof (struct GNUNET_MESH_DataACK))
359 ch = GMT_get_channel (t, ntohl (msg->chid));
362 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
364 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
369 GMCH_handle_data_ack (ch, msg, fwd);
373 handle_ch_create (struct MeshTunnel3 *t,
374 const struct GNUNET_MESH_ChannelCreate *msg,
377 struct MeshChannel *ch;
381 size = ntohs (msg->header.size);
382 if (size != sizeof (struct GNUNET_MESH_ChannelCreate))
389 ch = GMT_get_channel (t, ntohl (msg->chid));
392 /* Probably a retransmission, safe to ignore */
393 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
397 ch = GMCH_handle_create (t, msg, fwd);
399 GMT_add_channel (t, ch);
403 handle_ch_ack (struct MeshTunnel3 *t,
404 const struct GNUNET_MESH_ChannelManage *msg,
407 struct MeshChannel *ch;
411 size = ntohs (msg->header.size);
412 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
419 ch = GMT_get_channel (t, ntohl (msg->chid));
422 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
424 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
429 GMCH_handle_ack (ch, msg, fwd);
433 handle_ch_destroy (struct MeshTunnel3 *t,
434 const struct GNUNET_MESH_ChannelManage *msg,
437 struct MeshChannel *ch;
441 size = ntohs (msg->header.size);
442 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
449 ch = GMT_get_channel (t, ntohl (msg->chid));
452 /* Probably a retransmission, safe to ignore */
456 GMCH_handle_destroy (ch, msg, fwd);
461 * Demultiplex by message type and call appropriate handler for a message
462 * towards a channel of a local tunnel.
464 * @param t Tunnel this message came on.
465 * @param msgh Message header.
466 * @param fwd Is this message fwd?
469 handle_decrypted (struct MeshTunnel3 *t,
470 const struct GNUNET_MessageHeader *msgh,
475 type = ntohs (msgh->type);
476 LOG (GNUNET_ERROR_TYPE_DEBUG,
477 "Got a %s message!\n",
478 GNUNET_MESH_DEBUG_M2S (type));
482 case GNUNET_MESSAGE_TYPE_MESH_DATA:
483 /* Don't send hop ACK, wait for client to ACK */
484 handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
487 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
488 handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
491 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
493 (struct GNUNET_MESH_ChannelCreate *) msgh,
497 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
499 (struct GNUNET_MESH_ChannelManage *) msgh,
503 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
504 handle_ch_destroy (t,
505 (struct GNUNET_MESH_ChannelManage *) msgh,
511 LOG (GNUNET_ERROR_TYPE_DEBUG,
512 "end-to-end message not known (%u)\n",
517 /******************************************************************************/
518 /******************************** API ***********************************/
519 /******************************************************************************/
523 * Decrypt and demultiplex by message type. Call appropriate handler
526 * @param t Tunnel this message came on.
527 * @param msg Encrypted message.
528 * @param fwd Is this message fwd?
531 GMT_handle_encrypted (struct MeshTunnel3 *t,
532 const struct GNUNET_MESH_Encrypted *msg,
535 size_t size = ntohs (msg->header.size);
536 size_t payload_size = size - sizeof (struct GNUNET_MESH_Encrypted);
537 char cbuf[payload_size];
538 struct GNUNET_MessageHeader *msgh;
541 GMT_decrypt (t, cbuf, &msg[1], payload_size, msg->iv, fwd);
543 while (off < payload_size)
545 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
546 handle_decrypted (t, msgh, fwd);
547 off += ntohs (msgh->size);
553 * Cache a message to be sent once tunnel is online.
555 * @param t Tunnel to hold the message.
556 * @param ch Channel the message is about.
557 * @param msg Message itself (copy will be made).
558 * @param fwd Is this fwd?
561 GMT_queue_data (struct MeshTunnel3 *t,
562 struct MeshChannel *ch,
563 struct GNUNET_MessageHeader *msg,
566 struct MeshTunnelQueue *tq;
567 uint16_t size = ntohs (msg->size);
569 tq = GNUNET_malloc (sizeof (struct MeshTunnelQueue) + size);
572 memcpy (&tq[1], msg, size);
573 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tq);
575 if (MESH_TUNNEL3_READY == t->state)
576 GMT_send_queued_data (t, fwd);
581 * Send all cached messages that we can, tunnel is online.
583 * @param t Tunnel that holds the messages.
584 * @param fwd Is this fwd?
587 GMT_send_queued_data (struct MeshTunnel3 *t, int fwd)
589 struct MeshTunnelQueue *tq;
590 struct MeshTunnelQueue *next;
593 LOG (GNUNET_ERROR_TYPE_DEBUG,
594 "GMT_send_queued_data on tunnel %s\n",
596 room = GMT_get_buffer (t, fwd);
597 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
598 for (tq = t->tq_head; NULL != tq && room > 0; tq = next)
600 LOG (GNUNET_ERROR_TYPE_DEBUG, " data on channel %s\n", GMCH_2s (tq->ch));
603 GNUNET_CONTAINER_DLL_remove (t->tq_head, t->tq_tail, tq);
604 GMCH_send_prebuilt_message ((struct GNUNET_MessageHeader *) &tq[1],
609 LOG (GNUNET_ERROR_TYPE_DEBUG,
610 "GMT_send_queued_data end\n",
616 * Initialize the tunnel subsystem.
618 * @param c Configuration handle.
619 * @param key ECC private key, to derive all other keys and do crypto.
622 GMT_init (const struct GNUNET_CONFIGURATION_Handle *c,
623 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
625 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
627 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
630 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
631 "MESH", "DEFAULT_TTL", "USING DEFAULT");
634 my_private_key = key;
639 * Shut down the tunnel subsystem.
650 * @param destination Peer this tunnel is towards.
653 GMT_new (struct MeshPeer *destination)
655 struct MeshTunnel3 *t;
657 t = GNUNET_new (struct MeshTunnel3);
659 t->peer = destination;
661 // GNUNET_CONTAINER_multihashmap_put (tunnels, tid, t,
662 // GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
665 // tunnel_destroy (t);
669 // char salt[] = "salt";
670 // GNUNET_CRYPTO_kdf (&t->e_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
671 // salt, sizeof (salt),
672 // &t->e_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
673 // &my_full_id, sizeof (struct GNUNET_PeerIdentity),
674 // GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
676 // GNUNET_CRYPTO_kdf (&t->d_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
677 // salt, sizeof (salt),
678 // &t->d_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
679 // GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
680 // &my_full_id, sizeof (struct GNUNET_PeerIdentity),
688 * Change the tunnel state.
690 * @param t Tunnel whose state to change.
691 * @param state New state.
694 GMT_change_state (struct MeshTunnel3* t, enum MeshTunnel3State state)
698 LOG (GNUNET_ERROR_TYPE_DEBUG,
699 "Tunnel %s state was %s\n",
701 GMT_state2s (t->state));
702 LOG (GNUNET_ERROR_TYPE_DEBUG,
703 "Tunnel %s state is now %s\n",
705 GMT_state2s (state));
707 if (MESH_TUNNEL3_READY == state && 3 <= GMT_count_connections (t))
709 GMP_stop_search (t->peer);
715 * Add a connection to a tunnel.
718 * @param c Connection.
721 GMT_add_connection (struct MeshTunnel3 *t, struct MeshConnection *c)
723 struct MeshTConnection *aux;
725 for (aux = t->connection_head; aux != NULL; aux = aux->next)
729 aux = GNUNET_new (struct MeshTConnection);
731 GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, aux);
736 * Remove a connection from a tunnel.
739 * @param c Connection.
742 GMT_remove_connection (struct MeshTunnel3 *t, struct MeshConnection *c)
744 struct MeshTConnection *aux;
746 for (aux = t->connection_head; aux != NULL; aux = aux->next)
749 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
757 * Add a channel to a tunnel.
763 GMT_add_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
765 struct MeshTChannel *aux;
767 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
769 for (aux = t->channel_head; aux != NULL; aux = aux->next)
771 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
776 aux = GNUNET_new (struct MeshTChannel);
778 LOG (GNUNET_ERROR_TYPE_DEBUG, " adding %p to %p\n", aux, t->channel_head);
779 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
784 * Remove a channel from a tunnel.
790 GMT_remove_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
792 struct MeshTChannel *aux;
794 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
795 for (aux = t->channel_head; aux != NULL; aux = aux->next)
799 LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GMCH_2s (ch));
800 GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
809 * Search for a channel by global ID.
811 * @param t Tunnel containing the channel.
812 * @param chid Public channel number.
814 * @return channel handler, NULL if doesn't exist
817 GMT_get_channel (struct MeshTunnel3 *t, MESH_ChannelNumber chid)
819 struct MeshTChannel *iter;
824 for (iter = t->channel_head; NULL != iter; iter = iter->next)
826 if (GMCH_get_id (iter->ch) == chid)
830 return NULL == iter ? NULL : iter->ch;
835 * Tunnel is empty: destroy it.
837 * Notifies all connections about the destruction.
839 * @param t Tunnel to destroy.
842 GMT_destroy_empty (struct MeshTunnel3 *t)
844 struct MeshTConnection *iter;
846 for (iter = t->connection_head; NULL != iter; iter = iter->next)
848 GMC_send_destroy (iter->c);
851 if (0 == t->pending_messages)
854 t->destroy = GNUNET_YES;
859 * Destroy tunnel if empty (no more channels).
861 * @param t Tunnel to destroy if empty.
864 GMT_destroy_if_empty (struct MeshTunnel3 *t)
866 if (1 < GMT_count_channels (t))
869 GMT_destroy_empty (t);
874 * Destroy the tunnel.
876 * This function does not generate any warning traffic to clients or peers.
879 * Cancel messages belonging to this tunnel queued to neighbors.
880 * Free any allocated resources linked to the tunnel.
882 * @param t The tunnel to destroy.
885 GMT_destroy (struct MeshTunnel3 *t)
887 struct MeshTConnection *iter;
888 struct MeshTConnection *next;
893 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GMP_2s (t->peer));
895 // if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t))
898 for (iter = t->connection_head; NULL != iter; iter = next)
901 GMC_destroy (iter->c);
905 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
906 GMP_set_tunnel (t->peer, NULL);
913 * @brief Use the given path for the tunnel.
914 * Update the next and prev hops (and RCs).
915 * (Re)start the path refresh in case the tunnel is locally owned.
917 * @param t Tunnel to update.
918 * @param p Path to use.
920 * @return Connection created.
922 struct MeshConnection *
923 GMT_use_path (struct MeshTunnel3 *t, struct MeshPeerPath *p)
925 struct MeshConnection *c;
926 struct GNUNET_HashCode cid;
927 unsigned int own_pos;
929 if (NULL == t || NULL == p)
935 for (own_pos = 0; own_pos < p->length; own_pos++)
937 if (p->peers[own_pos] == myid)
940 if (own_pos > p->length - 1)
946 GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE, &cid);
947 c = GMC_new (&cid, t, p, own_pos);
948 GMT_add_connection (t, c);
954 * Count established (ready) connections of a tunnel.
956 * @param t Tunnel on which to count.
958 * @return Number of connections.
961 GMT_count_connections (struct MeshTunnel3 *t)
963 struct MeshTConnection *iter;
966 for (count = 0, iter = t->connection_head;
968 iter = iter->next, count++);
974 * Count channels of a tunnel.
976 * @param t Tunnel on which to count.
978 * @return Number of channels.
981 GMT_count_channels (struct MeshTunnel3 *t)
983 struct MeshTChannel *iter;
986 for (count = 0, iter = t->channel_head;
988 iter = iter->next, count++) /* skip */;
995 * Get the state of a tunnel.
999 * @return Tunnel's state.
1001 enum MeshTunnel3State
1002 GMT_get_state (struct MeshTunnel3 *t)
1005 return (enum MeshTunnel3State) -1;
1010 * Get the total buffer space for a tunnel.
1012 * If terminal, use the biggest channel buffer (or 64) if no channel exists.
1013 * If not terminal, use the sum of all connection buffers.
1016 * @param fwd Is this for FWD traffic?
1018 * @return Buffer space offered by all entities (c/ch) in the tunnel.
1021 GMT_get_buffer (struct MeshTunnel3 *t, int fwd)
1023 struct MeshTConnection *iter;
1024 unsigned int buffer;
1026 iter = t->connection_head;
1029 /* If terminal, return biggest channel buffer */
1030 if (NULL == iter || GMC_is_terminal (iter->c, fwd))
1032 struct MeshTChannel *iter_ch;
1033 unsigned int ch_buf;
1035 if (NULL == t->channel_head)
1037 /* Probably getting buffer for a channel create/handshake. */
1041 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = iter_ch->next)
1043 ch_buf = GMCH_get_buffer (iter_ch->ch, fwd);
1044 if (ch_buf > buffer)
1050 /* If not terminal, return sum of connection buffers */
1051 while (NULL != iter)
1053 if (GMC_get_state (iter->c) != MESH_CONNECTION_READY)
1059 buffer += GMC_get_buffer (iter->c, fwd);
1068 * Get the tunnel's destination.
1072 * @return ID of the destination peer.
1074 const struct GNUNET_PeerIdentity *
1075 GMT_get_destination (struct MeshTunnel3 *t)
1077 return GMP_get_id (t->peer);
1082 * Get the tunnel's next free global channel ID.
1086 * @return GID of a channel free to use.
1089 GMT_get_next_chid (struct MeshTunnel3 *t)
1091 MESH_ChannelNumber chid;
1093 while (NULL != GMT_get_channel (t, t->next_chid))
1095 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
1096 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1098 chid = t->next_chid;
1099 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1106 * Send ACK on one or more channels due to buffer in connections.
1108 * @param t Channel which has some free buffer space.
1109 * @param fwd Is this for FWD traffic? (ACK goes to root)
1112 GMT_unchoke_channels (struct MeshTunnel3 *t, int fwd)
1114 struct MeshTChannel *iter;
1115 unsigned int buffer;
1116 unsigned int channels = GMT_count_channels (t);
1117 unsigned int choked_n;
1118 struct MeshChannel *choked[channels];
1120 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_unchoke_channels on %s\n", GMT_2s (t));
1121 LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
1122 if (NULL != t->channel_head)
1123 LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
1131 /* Get buffer space */
1132 buffer = GMT_get_buffer (t, fwd);
1138 /* Count and remember choked channels */
1140 for (iter = t->channel_head; NULL != iter; iter = iter->next)
1142 if (GNUNET_NO == GMCH_get_allowed (iter->ch, fwd))
1144 choked[choked_n++] = iter->ch;
1148 /* Unchoke random channels */
1149 while (0 < buffer && 0 < choked_n)
1151 unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1153 GMCH_allow_client (choked[r], fwd);
1156 choked[r] = choked[choked_n];
1162 * Send ACK on one or more connections due to buffer space to the client.
1164 * Iterates all connections of the tunnel and sends ACKs appropriately.
1167 * @param fwd Is this in for FWD traffic? (ACK goes dest->root)
1170 GMT_send_acks (struct MeshTunnel3 *t, int fwd)
1172 struct MeshTConnection *iter;
1175 uint32_t allow_per_connection;
1177 unsigned int buffer;
1179 LOG (GNUNET_ERROR_TYPE_DEBUG,
1180 "Tunnel send %s ACKs on %s\n",
1181 fwd ? "FWD" : "BCK", GMT_2s (t));
1188 if (NULL == t->channel_head ||
1189 GNUNET_NO == GMCH_is_origin (t->channel_head->ch, !fwd))
1195 buffer = GMT_get_buffer (t, fwd);
1197 /* Count connections, how many messages are already allowed */
1198 cs = GMT_count_connections (t);
1199 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
1201 allowed += GMC_get_allowed (iter->c, fwd);
1204 /* Make sure there is no overflow */
1205 if (allowed > buffer)
1211 /* Authorize connections to send more data */
1212 to_allow = buffer; /* - allowed; */
1214 for (iter = t->connection_head; NULL != iter && to_allow > 0; iter = iter->next)
1216 allow_per_connection = to_allow/cs;
1217 to_allow -= allow_per_connection;
1219 if (GMC_get_allowed (iter->c, fwd) > 64 / 3)
1223 GMC_allow (iter->c, buffer, fwd);
1226 GNUNET_break (to_allow == 0);
1231 * Sends an already built message on a tunnel, GMT_encrypting it and
1232 * choosing the best connection.
1234 * @param message Message to send. Function modifies it.
1235 * @param t Tunnel on which this message is transmitted.
1236 * @param ch Channel on which this message is transmitted.
1237 * @param fwd Is this a fwd message?
1240 GMT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1241 struct MeshTunnel3 *t,
1242 struct MeshChannel *ch,
1245 struct MeshConnection *c;
1246 struct GNUNET_MESH_Encrypted *msg;
1247 size_t size = ntohs (message->size);
1248 char *cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
1252 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GMP_2s (t->peer));
1254 iv = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_NONCE, UINT64_MAX);
1255 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
1256 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED);
1257 msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size);
1258 msg->iv = GNUNET_htonll (iv);
1259 GMT_encrypt (t, &msg[1], message, size, iv, fwd);
1260 c = tunnel_get_connection (t, fwd);
1263 GNUNET_break (GNUNET_YES == t->destroy);
1266 type = ntohs (message->type);
1269 case GNUNET_MESSAGE_TYPE_MESH_DATA:
1270 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1271 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1272 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
1273 msg->cid = *GMC_get_id (c);
1274 msg->ttl = htonl (default_ttl);
1277 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
1278 GNUNET_MESH_DEBUG_M2S (type));
1283 t->pending_messages++;
1284 GMC_send_prebuilt_message (&msg->header, c, ch, fwd);
1288 * Is the tunnel directed towards the local peer?
1292 * @return GNUNET_YES if it is loopback.
1295 GMT_is_loopback (const struct MeshTunnel3 *t)
1297 return (myid == GMP_get_short_id(t->peer));
1302 * Is the tunnel using this path already?
1307 * @return GNUNET_YES a connection uses this path.
1310 GMT_is_path_used (const struct MeshTunnel3 *t, const struct MeshPeerPath *p)
1312 struct MeshTConnection *iter;
1314 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1315 if (GMC_get_path (iter->c) == p)
1323 * Get a cost of a path for a tunnel considering existing connections.
1326 * @param path Candidate path.
1328 * @return Cost of the path (path length + number of overlapping nodes)
1331 GMT_get_path_cost (const struct MeshTunnel3 *t,
1332 const struct MeshPeerPath *path)
1334 struct MeshTConnection *iter;
1335 unsigned int overlap;
1343 GNUNET_assert (NULL != t);
1345 for (i = 0; i < path->length; i++)
1347 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1349 for (j = 0; j < GMC_get_path (iter->c)->length; j++)
1351 if (path->peers[i] == GMC_get_path (iter->c)->peers[j])
1359 return (path->length + overlap) * (path->score * -1);
1364 * Get the static string for the peer this tunnel is directed.
1368 * @return Static string the destination peer's ID.
1371 GMT_2s (const struct MeshTunnel3 *t)
1373 return GMP_2s (t->peer);