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__)
37 /******************************************************************************/
38 /******************************** STRUCTS **********************************/
39 /******************************************************************************/
43 struct MeshTChannel *next;
44 struct MeshTChannel *prev;
45 struct MeshChannel *ch;
48 struct MeshTConnection
50 struct MeshTConnection *next;
51 struct MeshTConnection *prev;
52 struct MeshConnection *c;
56 * Struct containing all information regarding a tunnel to a peer.
61 * Endpoint of the tunnel.
63 struct MeshPeer *peer;
66 * State of the tunnel.
68 enum MeshTunnel3State state;
71 * Local peer ephemeral private key
73 struct GNUNET_CRYPTO_EddsaPrivateKey *my_eph_key;
76 * Local peer ephemeral public key
78 struct GNUNET_CRYPTO_EddsaPublicKey *my_eph;
81 * Remote peer's public key.
83 struct GNUNET_CRYPTO_EddsaPublicKey *peers_eph;
86 * Encryption ("our") key.
88 struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
91 * Decryption ("their") key.
93 struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
96 * Paths that are actively used to reach the destination peer.
98 struct MeshTConnection *connection_head;
99 struct MeshTConnection *connection_tail;
102 * Next connection number.
107 * Channels inside this tunnel.
109 struct MeshTChannel *channel_head;
110 struct MeshTChannel *channel_tail;
113 * Channel ID for the next created channel.
115 MESH_ChannelNumber next_chid;
118 * Pending message count.
120 int pending_messages;
123 * Destroy flag: if true, destroy on last message.
128 * Queued messages, to transmit once tunnel gets connected.
130 struct MeshTunnelQueue *tq_head;
131 struct MeshTunnelQueue *tq_tail;
136 * Struct used to queue messages in a tunnel.
138 struct MeshTunnelQueue
143 struct MeshTunnelQueue *next;
144 struct MeshTunnelQueue *prev;
149 struct MeshChannel *ch;
154 /* struct GNUNET_MessageHeader *msg; */
157 /******************************************************************************/
158 /******************************* GLOBALS ***********************************/
159 /******************************************************************************/
162 * Global handle to the statistics service.
164 extern struct GNUNET_STATISTICS_Handle *stats;
167 * Local peer own ID (memory efficient handle).
169 extern GNUNET_PEER_Id myid;
172 * Local peer own ID (full value).
174 extern struct GNUNET_PeerIdentity my_full_id;
177 * Default TTL for payload packets.
179 static unsigned long long default_ttl;
184 const static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
187 /******************************************************************************/
188 /******************************** STATIC ***********************************/
189 /******************************************************************************/
192 * Get string description for tunnel state.
194 * @param s Tunnel state.
196 * @return String representation.
199 GMT_state2s (enum MeshTunnel3State s)
201 static char buf[128];
205 case MESH_TUNNEL3_NEW:
206 return "MESH_TUNNEL3_NEW";
207 case MESH_TUNNEL3_SEARCHING:
208 return "MESH_TUNNEL3_SEARCHING";
209 case MESH_TUNNEL3_WAITING:
210 return "MESH_TUNNEL3_WAITING";
211 case MESH_TUNNEL3_READY:
212 return "MESH_TUNNEL3_READY";
213 case MESH_TUNNEL3_RECONNECTING:
214 return "MESH_TUNNEL3_RECONNECTING";
217 sprintf (buf, "%u (UNKNOWN STATE)", s);
223 * Pick a connection on which send the next data message.
225 * @param t Tunnel on which to send the message.
226 * @param fwd Is this a fwd message?
228 * @return The connection on which to send the next message.
230 static struct MeshConnection *
231 tunnel_get_connection (struct MeshTunnel3 *t, int fwd)
233 struct MeshTConnection *iter;
234 struct MeshConnection *best;
236 unsigned int lowest_q;
238 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GMP_2s (t->peer));
241 for (iter = t->connection_head; NULL != iter; iter = iter->next)
243 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
244 GNUNET_h2s (GMC_get_id (iter->c)), GMC_get_state (iter->c));
245 if (MESH_CONNECTION_READY == GMC_get_state (iter->c))
247 qn = GMC_get_qn (iter->c, fwd);
248 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
261 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
262 * Encrypt data with the tunnel key.
264 * @param t Tunnel whose key to use.
265 * @param dst Destination for the GMT_encrypted data.
266 * @param src Source of the plaintext.
267 * @param size Size of the plaintext.
268 * @param iv Initialization Vector to use.
269 * @param fwd Is this a fwd message?
272 GMT_encrypt (struct MeshTunnel3 *t,
273 void *dst, const void *src,
274 size_t size, uint64_t iv, int fwd)
276 memcpy (dst, src, size);
281 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
282 * Decrypt data with the tunnel key.
284 * @param t Tunnel whose key to use.
285 * @param dst Destination for the plaintext.
286 * @param src Source of the GMT_encrypted data.
287 * @param size Size of the GMT_encrypted data.
288 * @param iv Initialization Vector to use.
289 * @param fwd Is this a fwd message?
292 GMT_decrypt (struct MeshTunnel3 *t,
293 void *dst, const void *src,
294 size_t size, uint64_t iv, int fwd)
296 memcpy (dst, src, size);
301 handle_data (struct MeshTunnel3 *t,
302 const struct GNUNET_MESH_Data *msg,
305 struct MeshChannel *ch;
310 size = ntohs (msg->header.size);
312 sizeof (struct GNUNET_MESH_Data) +
313 sizeof (struct GNUNET_MessageHeader))
318 type = ntohs (msg->header.type);
319 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a %s message\n",
320 GNUNET_MESH_DEBUG_M2S (type));
321 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
322 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
325 ch = GMT_get_channel (t, ntohl (msg->chid));
328 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
330 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
335 GMT_change_state (t, MESH_TUNNEL3_READY);
336 GMCH_handle_data (ch, msg, fwd);
340 handle_data_ack (struct MeshTunnel3 *t,
341 const struct GNUNET_MESH_DataACK *msg,
344 struct MeshChannel *ch;
348 size = ntohs (msg->header.size);
349 if (size != sizeof (struct GNUNET_MESH_DataACK))
356 ch = GMT_get_channel (t, ntohl (msg->chid));
359 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
361 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
366 GMCH_handle_data_ack (ch, msg, fwd);
370 handle_ch_create (struct MeshTunnel3 *t,
371 const struct GNUNET_MESH_ChannelCreate *msg,
374 struct MeshTChannel *tch;
375 struct MeshChannel *ch;
379 size = ntohs (msg->header.size);
380 if (size != sizeof (struct GNUNET_MESH_ChannelCreate))
387 ch = GMT_get_channel (t, ntohl (msg->chid));
390 /* Probably a retransmission, safe to ignore */
391 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
395 ch = GMCH_handle_create (msg, fwd);
398 tch = GNUNET_new (struct MeshTChannel);
400 GNUNET_CONTAINER_DLL_insert (t->channel_head, t->channel_tail, tch);
404 handle_ch_ack (struct MeshTunnel3 *t,
405 const struct GNUNET_MESH_ChannelManage *msg,
408 struct MeshChannel *ch;
412 size = ntohs (msg->header.size);
413 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
420 ch = GMT_get_channel (t, ntohl (msg->chid));
423 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
425 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
430 GMCH_handle_ack (ch, msg, fwd);
434 handle_ch_destroy (struct MeshTunnel3 *t,
435 const struct GNUNET_MESH_ChannelManage *msg,
438 struct MeshChannel *ch;
442 size = ntohs (msg->header.size);
443 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
450 ch = GMT_get_channel (t, ntohl (msg->chid));
453 /* Probably a retransmission, safe to ignore */
457 GMCH_handle_destroy (ch, msg, fwd);
462 * Demultiplex by message type and call appropriate handler for a message
463 * towards a channel of a local tunnel.
465 * @param t Tunnel this message came on.
466 * @param msgh Message header.
467 * @param fwd Is this message fwd?
470 handle_GMT_decrypted (struct MeshTunnel3 *t,
471 const struct GNUNET_MessageHeader *msgh,
476 type = ntohs (msgh->type);
477 LOG (GNUNET_ERROR_TYPE_DEBUG,
478 "Got a %s message!\n",
479 GNUNET_MESH_DEBUG_M2S (type));
483 case GNUNET_MESSAGE_TYPE_MESH_DATA:
484 /* Don't send hop ACK, wait for client to ACK */
485 handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
488 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
489 handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
492 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
494 (struct GNUNET_MESH_ChannelCreate *) msgh,
498 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
500 (struct GNUNET_MESH_ChannelManage *) msgh,
504 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
505 handle_ch_destroy (t,
506 (struct GNUNET_MESH_ChannelManage *) msgh,
512 LOG (GNUNET_ERROR_TYPE_DEBUG,
513 "end-to-end message not known (%u)\n",
518 /******************************************************************************/
519 /******************************** API ***********************************/
520 /******************************************************************************/
524 * Decrypt and demultiplex by message type. Call appropriate handler
527 * @param t Tunnel this message came on.
528 * @param msgh Encrypted message.
529 * @param fwd Is this message fwd?
532 GMT_handle_encrypted (struct MeshTunnel3 *t,
533 const struct GNUNET_MESH_Encrypted *msg,
536 size_t size = ntohs (msg->header.size);
537 size_t payload_size = size - sizeof (struct GNUNET_MESH_Encrypted);
538 char cbuf[payload_size];
539 struct GNUNET_MessageHeader *msgh;
542 GMT_decrypt (t, cbuf, &msg[1], payload_size, msg->iv, fwd);
544 while (off < payload_size)
546 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
547 handle_GMT_decrypted (t, msgh, fwd);
548 off += ntohs (msgh->size);
554 * Cache a message to be sent once tunnel is online.
556 * @param t Tunnel to hold the message.
557 * @param ch Channel the message is about.
558 * @param msg Message itself (copy will be made).
559 * @param fwd Is this fwd?
562 GMT_queue_data (struct MeshTunnel3 *t,
563 struct MeshChannel *ch,
564 struct GNUNET_MessageHeader *msg,
567 struct MeshTunnelQueue *tq;
568 uint16_t size = ntohs (msg->size);
570 tq = GNUNET_malloc (sizeof (struct MeshTunnelQueue) + size);
573 memcpy (&tq[1], msg, size);
574 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tq);
576 if (MESH_TUNNEL3_READY == t->state)
577 GMT_send_queued_data (t, fwd);
582 * Send all cached messages that we can, tunnel is online.
584 * @param t Tunnel that holds the messages.
585 * @param fwd Is this fwd?
588 GMT_send_queued_data (struct MeshTunnel3 *t, int fwd)
590 struct MeshTunnelQueue *tq;
591 struct MeshTunnelQueue *next;
594 LOG (GNUNET_ERROR_TYPE_DEBUG,
595 "GMT_send_queued_data on tunnel %s\n",
597 room = GMT_get_buffer (t, fwd);
598 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
599 for (tq = t->tq_head; NULL != tq && room > 0; tq = next)
603 GNUNET_CONTAINER_DLL_remove (t->tq_head, t->tq_tail, tq);
604 GMCH_send_prebuilt_message ((struct GNUNET_MessageHeader *) &tq[1],
613 * Initialize the tunnel subsystem.
615 * @param c Configuration handle.
616 * @param id Peer identity.
617 * @param key ECC private key, to derive all other keys and do crypto.
620 GMT_init (const struct GNUNET_CONFIGURATION_Handle *c,
621 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
623 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
625 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
628 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
629 "MESH", "DEFAULT_TTL", "USING DEFAULT");
632 my_private_key = key;
637 * Shut down the tunnel subsystem.
642 GNUNET_PEER_change_rc (myid, -1);
649 * @param destination Peer this tunnel is towards.
652 GMT_new (struct MeshPeer *destination)
654 struct MeshTunnel3 *t;
656 t = GNUNET_new (struct MeshTunnel3);
658 t->peer = destination;
660 // GNUNET_CONTAINER_multihashmap_put (tunnels, tid, t,
661 // GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
664 // tunnel_destroy (t);
668 // char salt[] = "salt";
669 // GNUNET_CRYPTO_kdf (&t->e_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
670 // salt, sizeof (salt),
671 // &t->e_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
672 // &my_full_id, sizeof (struct GNUNET_PeerIdentity),
673 // GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
675 // GNUNET_CRYPTO_kdf (&t->d_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
676 // salt, sizeof (salt),
677 // &t->d_key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
678 // GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity),
679 // &my_full_id, sizeof (struct GNUNET_PeerIdentity),
687 * Change the tunnel state.
689 * @param t Tunnel whose state to change.
690 * @param state New state.
693 GMT_change_state (struct MeshTunnel3* t, enum MeshTunnel3State state)
697 LOG (GNUNET_ERROR_TYPE_DEBUG,
698 "Tunnel %s state was %s\n",
700 GMT_state2s (t->state));
701 LOG (GNUNET_ERROR_TYPE_DEBUG,
702 "Tunnel %s state is now %s\n",
704 GMT_state2s (state));
706 if (MESH_TUNNEL3_READY == state && 3 <= GMT_count_connections (t))
708 GMP_stop_search (t->peer);
714 * Add a connection to a tunnel.
717 * @param c Connection.
720 GMT_add_connection (struct MeshTunnel3 *t, struct MeshConnection *c)
722 struct MeshTConnection *aux;
724 for (aux = t->connection_head; aux != NULL; aux = aux->next)
728 aux = GNUNET_new (struct MeshTConnection);
730 GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, aux);
735 * Remove a connection from a tunnel.
738 * @param c Connection.
741 GMT_remove_connection (struct MeshTunnel3 *t, struct MeshConnection *c)
743 struct MeshTConnection *aux;
745 for (aux = t->connection_head; aux != NULL; aux = aux->next)
748 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
756 * Add a channel to a tunnel.
762 GMT_add_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
764 struct MeshTChannel *aux;
766 for (aux = t->channel_head; aux != NULL; aux = aux->next)
770 aux = GNUNET_new (struct MeshTChannel);
772 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
777 * Remove a channel from a tunnel.
783 GMT_remove_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
785 struct MeshTChannel *aux;
787 for (aux = t->channel_head; aux != NULL; aux = aux->next)
790 GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
798 * Search for a channel by global ID.
800 * @param t Tunnel containing the channel.
801 * @param chid Public channel number.
803 * @return channel handler, NULL if doesn't exist
806 GMT_get_channel (struct MeshTunnel3 *t, MESH_ChannelNumber chid)
808 struct MeshTChannel *iter;
813 for (iter = t->channel_head; NULL != iter; iter = iter->next)
815 if (GMCH_get_id (iter->ch) == chid)
819 return NULL == iter ? NULL : iter->ch;
824 * Tunnel is empty: destroy it.
826 * Notifies all connections about the destruction.
828 * @param t Tunnel to destroy.
831 GMT_destroy_empty (struct MeshTunnel3 *t)
833 struct MeshTConnection *iter;
835 for (iter = t->connection_head; NULL != iter; iter = iter->next)
837 GMC_send_destroy (iter->c);
840 if (0 == t->pending_messages)
843 t->destroy = GNUNET_YES;
848 * Destroy tunnel if empty (no more channels).
850 * @param t Tunnel to destroy if empty.
853 GMT_destroy_if_empty (struct MeshTunnel3 *t)
855 if (1 < GMT_count_channels (t))
858 GMT_destroy_empty (t);
863 * Destroy the tunnel.
865 * This function does not generate any warning traffic to clients or peers.
868 * Cancel messages belonging to this tunnel queued to neighbors.
869 * Free any allocated resources linked to the tunnel.
871 * @param t The tunnel to destroy.
874 GMT_destroy (struct MeshTunnel3 *t)
876 struct MeshTConnection *iter;
877 struct MeshTConnection *next;
882 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GMP_2s (t->peer));
884 // if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t))
887 for (iter = t->connection_head; NULL != iter; iter = next)
890 GMC_destroy (iter->c);
894 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
895 GMP_set_tunnel (t->peer, NULL);
902 * @brief Use the given path for the tunnel.
903 * Update the next and prev hops (and RCs).
904 * (Re)start the path refresh in case the tunnel is locally owned.
906 * @param t Tunnel to update.
907 * @param p Path to use.
909 * @return Connection created.
911 struct MeshConnection *
912 GMT_use_path (struct MeshTunnel3 *t, struct MeshPeerPath *p)
914 struct MeshConnection *c;
915 struct GNUNET_HashCode cid;
916 unsigned int own_pos;
918 if (NULL == t || NULL == p)
924 for (own_pos = 0; own_pos < p->length; own_pos++)
926 if (p->peers[own_pos] == myid)
929 if (own_pos > p->length - 1)
935 GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE, &cid);
936 c = GMC_new (&cid, t, p, own_pos);
937 GMT_add_connection (t, c);
943 * Count established (ready) connections of a tunnel.
945 * @param t Tunnel on which to count.
947 * @return Number of connections.
950 GMT_count_connections (struct MeshTunnel3 *t)
952 struct MeshTConnection *iter;
955 for (count = 0, iter = t->connection_head;
957 iter = iter->next, count++);
963 * Count channels of a tunnel.
965 * @param t Tunnel on which to count.
967 * @return Number of channels.
970 GMT_count_channels (struct MeshTunnel3 *t)
972 struct MeshTChannel *iter;
975 for (count = 0, iter = t->channel_head;
977 iter = iter->next, count++);
984 * Get the state of a tunnel.
988 * @return Tunnel's state.
990 enum MeshTunnel3State
991 GMT_get_state (struct MeshTunnel3 *t)
994 return (enum MeshTunnel3State) -1;
999 * Get the total buffer space for a tunnel.
1002 * @param fwd Is this for FWD traffic?
1004 * @return Buffer space offered by all connections in the tunnel.
1007 GMT_get_buffer (struct MeshTunnel3 *t, int fwd)
1009 struct MeshTConnection *iter;
1010 unsigned int buffer;
1012 iter = t->connection_head;
1015 /* If terminal, return biggest channel buffer */
1016 if (NULL == iter || GMC_is_terminal (iter->c, fwd))
1018 struct MeshTChannel *iter_ch;
1019 unsigned int ch_buf;
1021 if (NULL == t->channel_head)
1023 /* Probably getting buffer for a channel create. */
1027 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = iter_ch->next)
1029 ch_buf = GMCH_get_buffer (iter_ch->ch, fwd);
1030 if (ch_buf > buffer)
1036 /* If not terminal, return sum of connection buffers */
1037 while (NULL != iter)
1039 if (GMC_get_state (iter->c) != MESH_CONNECTION_READY)
1045 buffer += GMC_get_buffer (iter->c, fwd);
1054 * Get the tunnel's destination.
1058 * @return ID of the destination peer.
1060 const struct GNUNET_PeerIdentity *
1061 GMT_get_destination (struct MeshTunnel3 *t)
1063 return GMP_get_id (t->peer);
1068 * Get the tunnel's next free global channel ID.
1072 * @return GID of a channel free to use.
1075 GMT_get_next_chid (struct MeshTunnel3 *t)
1077 MESH_ChannelNumber chid;
1079 while (NULL != GMT_get_channel (t, t->next_chid))
1081 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
1082 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1084 chid = t->next_chid;
1085 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1092 * Send ACK on one or more connections due to buffer space to the client.
1094 * Iterates all connections of the tunnel and sends ACKs appropriately.
1096 * @param ch Channel which has some free buffer space.
1097 * @param fwd Is this in for FWD traffic? (ACK goes dest->root)
1100 GMT_send_acks (struct MeshTunnel3 *t, unsigned int buffer, int fwd)
1102 struct MeshTConnection *iter;
1105 uint32_t allow_per_connection;
1108 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1109 "Tunnel send acks on %s:%X\n",
1110 fwd ? "FWD" : "BCK", GMT_2s (t));
1117 if (NULL == t->channel_head ||
1118 GNUNET_NO == GMCH_is_origin (t->channel_head->ch, fwd))
1124 /* Count connections, how many messages are already allowed */
1125 cs = GMT_count_connections (t);
1126 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
1128 allowed += GMC_get_allowed (iter->c, fwd);
1131 /* Make sure there is no overflow */
1132 if (allowed > buffer)
1138 /* Authorize connections to send more data */
1139 to_allow = buffer; /* - allowed; */
1141 for (iter = t->connection_head; NULL != iter && to_allow > 0; iter = iter->next)
1143 allow_per_connection = to_allow/cs;
1144 to_allow -= allow_per_connection;
1146 if (GMC_get_allowed (iter->c, fwd) > 64 / 3)
1150 GMC_allow (iter->c, buffer, fwd);
1153 GNUNET_break (to_allow == 0);
1158 * Sends an already built message on a tunnel, GMT_encrypting it and
1159 * choosing the best connection.
1161 * @param message Message to send. Function modifies it.
1162 * @param t Tunnel on which this message is transmitted.
1163 * @param ch Channel on which this message is transmitted.
1164 * @param fwd Is this a fwd message?
1167 GMT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1168 struct MeshTunnel3 *t,
1169 struct MeshChannel *ch,
1172 struct MeshConnection *c;
1173 struct GNUNET_MESH_Encrypted *msg;
1174 size_t size = ntohs (message->size);
1175 char *cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
1179 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send on Tunnel %s\n", GMP_2s (t->peer));
1181 iv = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_NONCE, UINT64_MAX);
1182 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
1183 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED);
1184 msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size);
1185 msg->iv = GNUNET_htonll (iv);
1186 GMT_encrypt (t, &msg[1], message, size, iv, fwd);
1187 c = tunnel_get_connection (t, fwd);
1190 GNUNET_break (GNUNET_YES == t->destroy);
1193 type = ntohs (message->type);
1196 case GNUNET_MESSAGE_TYPE_MESH_FWD:
1197 case GNUNET_MESSAGE_TYPE_MESH_BCK:
1198 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1199 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1200 msg->cid = *GMC_get_id (c);
1201 msg->ttl = htonl (default_ttl);
1204 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
1205 GNUNET_MESH_DEBUG_M2S (type));
1210 t->pending_messages++;
1211 GMC_send_prebuilt_message (&msg->header, c, ch, fwd);
1215 * Is the tunnel directed towards the local peer?
1219 * @return GNUNET_YES if it is loopback.
1222 GMT_is_loopback (const struct MeshTunnel3 *t)
1224 return (myid == GMP_get_short_id(t->peer));
1229 * Is the tunnel using this path already?
1234 * @return GNUNET_YES a connection uses this path.
1237 GMT_is_path_used (const struct MeshTunnel3 *t, const struct MeshPeerPath *p)
1239 struct MeshTConnection *iter;
1241 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1242 if (GMC_get_path (iter->c) == p)
1250 * Get a cost of a path for a tunnel considering existing connections.
1253 * @param path Candidate path.
1255 * @return Cost of the path (path length + number of overlapping nodes)
1258 GMT_get_path_cost (const struct MeshTunnel3 *t,
1259 const struct MeshPeerPath *path)
1261 struct MeshTConnection *iter;
1262 unsigned int overlap;
1270 GNUNET_assert (NULL != t);
1272 for (i = 0; i < path->length; i++)
1274 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1276 for (j = 0; j < GMC_get_path (iter->c)->length; j++)
1278 if (path->peers[i] == GMC_get_path (iter->c)->peers[j])
1286 return (path->length + overlap) * (path->score * -1);
1291 * Get the static string for the peer this tunnel is directed.
1295 * @return Static string the destination peer's ID.
1298 GMT_2s (const struct MeshTunnel3 *t)
1300 return GMP_2s (t->peer);