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.
265 * @param t Tunnel whose key to use.
266 * @param dst Destination for the GMT_encrypted data.
267 * @param src Source of the plaintext.
268 * @param size Size of the plaintext.
269 * @param iv Initialization Vector to use.
270 * @param fwd Is this a fwd message?
273 GMT_encrypt (struct MeshTunnel3 *t,
274 void *dst, const void *src,
275 size_t size, uint64_t iv, int fwd)
277 memcpy (dst, src, size);
282 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
283 * Decrypt data with the tunnel key.
286 * @param t Tunnel whose key to use.
287 * @param dst Destination for the plaintext.
288 * @param src Source of the GMT_encrypted data.
289 * @param size Size of the GMT_encrypted data.
290 * @param iv Initialization Vector to use.
291 * @param fwd Is this a fwd message?
294 GMT_decrypt (struct MeshTunnel3 *t,
295 void *dst, const void *src,
296 size_t size, uint64_t iv, int fwd)
298 memcpy (dst, src, size);
303 handle_data (struct MeshTunnel3 *t,
304 const struct GNUNET_MESH_Data *msg,
307 struct MeshChannel *ch;
312 size = ntohs (msg->header.size);
314 sizeof (struct GNUNET_MESH_Data) +
315 sizeof (struct GNUNET_MessageHeader))
320 type = ntohs (msg->header.type);
321 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a %s message\n",
322 GNUNET_MESH_DEBUG_M2S (type));
323 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
324 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
327 ch = GMT_get_channel (t, ntohl (msg->chid));
330 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
332 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
337 GMT_change_state (t, MESH_TUNNEL3_READY);
338 GMCH_handle_data (ch, msg, fwd);
342 handle_data_ack (struct MeshTunnel3 *t,
343 const struct GNUNET_MESH_DataACK *msg,
346 struct MeshChannel *ch;
350 size = ntohs (msg->header.size);
351 if (size != sizeof (struct GNUNET_MESH_DataACK))
358 ch = GMT_get_channel (t, ntohl (msg->chid));
361 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
363 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
368 GMCH_handle_data_ack (ch, msg, fwd);
372 handle_ch_create (struct MeshTunnel3 *t,
373 const struct GNUNET_MESH_ChannelCreate *msg,
376 struct MeshTChannel *tch;
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 (msg, fwd);
400 tch = GNUNET_new (struct MeshTChannel);
402 GNUNET_CONTAINER_DLL_insert (t->channel_head, t->channel_tail, tch);
406 handle_ch_ack (struct MeshTunnel3 *t,
407 const struct GNUNET_MESH_ChannelManage *msg,
410 struct MeshChannel *ch;
414 size = ntohs (msg->header.size);
415 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
422 ch = GMT_get_channel (t, ntohl (msg->chid));
425 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
427 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
432 GMCH_handle_ack (ch, msg, fwd);
436 handle_ch_destroy (struct MeshTunnel3 *t,
437 const struct GNUNET_MESH_ChannelManage *msg,
440 struct MeshChannel *ch;
444 size = ntohs (msg->header.size);
445 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
452 ch = GMT_get_channel (t, ntohl (msg->chid));
455 /* Probably a retransmission, safe to ignore */
459 GMCH_handle_destroy (ch, msg, fwd);
464 * Demultiplex by message type and call appropriate handler for a message
465 * towards a channel of a local tunnel.
467 * @param t Tunnel this message came on.
468 * @param msgh Message header.
469 * @param fwd Is this message fwd?
472 handle_GMT_decrypted (struct MeshTunnel3 *t,
473 const struct GNUNET_MessageHeader *msgh,
478 type = ntohs (msgh->type);
479 LOG (GNUNET_ERROR_TYPE_DEBUG,
480 "Got a %s message!\n",
481 GNUNET_MESH_DEBUG_M2S (type));
485 case GNUNET_MESSAGE_TYPE_MESH_DATA:
486 /* Don't send hop ACK, wait for client to ACK */
487 handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
490 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
491 handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
494 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
496 (struct GNUNET_MESH_ChannelCreate *) msgh,
500 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
502 (struct GNUNET_MESH_ChannelManage *) msgh,
506 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
507 handle_ch_destroy (t,
508 (struct GNUNET_MESH_ChannelManage *) msgh,
514 LOG (GNUNET_ERROR_TYPE_DEBUG,
515 "end-to-end message not known (%u)\n",
520 /******************************************************************************/
521 /******************************** API ***********************************/
522 /******************************************************************************/
526 * Decrypt and demultiplex by message type. Call appropriate handler
529 * @param t Tunnel this message came on.
530 * @param msgh Encrypted message.
531 * @param fwd Is this message fwd?
534 GMT_handle_GMT_encrypted (struct MeshTunnel3 *t,
535 const struct GNUNET_MESH_Encrypted *msg,
538 size_t size = ntohs (msg->header.size);
539 size_t payload_size = size - sizeof (struct GNUNET_MESH_Encrypted);
540 char cbuf[payload_size];
541 struct GNUNET_MessageHeader *msgh;
544 GMT_decrypt (t, cbuf, &msg[1], payload_size, msg->iv, fwd);
546 while (off < payload_size)
548 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
549 handle_GMT_decrypted (t, msgh, fwd);
550 off += ntohs (msgh->size);
556 * Cache a message to be sent once tunnel is online.
558 * @param t Tunnel to hold the message.
559 * @param ch Channel the message is about.
560 * @param msg Message itself (copy will be made).
561 * @param fwd Is this fwd?
564 GMT_queue_data (struct MeshTunnel3 *t,
565 struct MeshChannel *ch,
566 struct GNUNET_MessageHeader *msg,
569 struct MeshTunnelQueue *tq;
570 uint16_t size = ntohs (msg->size);
572 tq = GNUNET_malloc (sizeof (struct MeshTunnelQueue) + size);
575 memcpy (&tq[1], msg, size);
576 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tq);
578 if (MESH_TUNNEL3_READY == t->state)
579 GMT_send_queued_data (t, fwd);
584 * Send all cached messages that we can, tunnel is online.
586 * @param t Tunnel that holds the messages.
587 * @param fwd Is this fwd?
590 GMT_send_queued_data (struct MeshTunnel3 *t, int fwd)
592 struct MeshTunnelQueue *tq;
593 struct MeshTunnelQueue *next;
596 LOG (GNUNET_ERROR_TYPE_DEBUG,
597 "GMT_send_queued_data on tunnel %s\n",
599 room = GMT_get_buffer (t, fwd);
600 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
601 for (tq = t->tq_head; NULL != tq && room > 0; tq = next)
605 GNUNET_CONTAINER_DLL_remove (t->tq_head, t->tq_tail, tq);
606 GMCH_send_prebuilt_message ((struct GNUNET_MessageHeader *) &tq[1],
615 * Initialize the tunnel subsystem.
617 * @param c Configuration handle.
618 * @param id Peer identity.
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)
626 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
629 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
630 "MESH", "DEFAULT_TTL", "USING DEFAULT");
633 my_private_key = key;
638 * Shut down the tunnel subsystem.
643 GNUNET_PEER_change_rc (myid, -1);
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 for (aux = t->channel_head; aux != NULL; aux = aux->next)
771 aux = GNUNET_new (struct MeshTChannel);
773 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
778 * Remove a channel from a tunnel.
784 GMT_remove_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
786 struct MeshTChannel *aux;
788 for (aux = t->channel_head; aux != NULL; aux = aux->next)
791 GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
799 * Search for a channel by global ID.
801 * @param t Tunnel containing the channel.
802 * @param chid Public channel number.
804 * @return channel handler, NULL if doesn't exist
807 GMT_get_channel (struct MeshTunnel3 *t, MESH_ChannelNumber chid)
809 struct MeshTChannel *iter;
814 for (iter = t->channel_head; NULL != iter; iter = iter->next)
816 if (GMCH_get_id (iter->ch) == chid)
820 return NULL == iter ? NULL : iter->ch;
825 * Tunnel is empty: destroy it.
827 * Notifies all connections about the destruction.
829 * @param t Tunnel to destroy.
832 GMT_destroy_empty (struct MeshTunnel3 *t)
834 struct MeshTConnection *iter;
836 for (iter = t->connection_head; NULL != iter; iter = iter->next)
838 GMC_send_destroy (iter->c);
841 if (0 == t->pending_messages)
844 t->destroy = GNUNET_YES;
849 * Destroy tunnel if empty (no more channels).
851 * @param t Tunnel to destroy if empty.
854 GMT_destroy_if_empty (struct MeshTunnel3 *t)
856 if (1 < GMT_count_channels (t))
859 GMT_destroy_empty (t);
864 * Destroy the tunnel.
866 * This function does not generate any warning traffic to clients or peers.
869 * Cancel messages belonging to this tunnel queued to neighbors.
870 * Free any allocated resources linked to the tunnel.
872 * @param t The tunnel to destroy.
875 GMT_destroy (struct MeshTunnel3 *t)
877 struct MeshTConnection *iter;
878 struct MeshTConnection *next;
883 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GMP_2s (t->peer));
885 // if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t))
888 for (iter = t->connection_head; NULL != iter; iter = next)
891 GMC_destroy (iter->c);
895 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
896 GMP_set_tunnel (t->peer, NULL);
903 * @brief Use the given path for the tunnel.
904 * Update the next and prev hops (and RCs).
905 * (Re)start the path refresh in case the tunnel is locally owned.
907 * @param t Tunnel to update.
908 * @param p Path to use.
910 * @return Connection created.
912 struct MeshConnection *
913 GMT_use_path (struct MeshTunnel3 *t, struct MeshPeerPath *p)
915 struct MeshConnection *c;
916 struct GNUNET_HashCode cid;
917 unsigned int own_pos;
919 if (NULL == t || NULL == p)
925 for (own_pos = 0; own_pos < p->length; own_pos++)
927 if (p->peers[own_pos] == myid)
930 if (own_pos > p->length - 1)
936 GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE, &cid);
937 c = GMC_new (&cid, t, p, own_pos);
938 GMT_add_connection (t, c);
944 * Count established (ready) connections of a tunnel.
946 * @param t Tunnel on which to count.
948 * @return Number of connections.
951 GMT_count_connections (struct MeshTunnel3 *t)
953 struct MeshTConnection *iter;
956 for (count = 0, iter = t->connection_head;
958 iter = iter->next, count++);
964 * Count channels of a tunnel.
966 * @param t Tunnel on which to count.
968 * @return Number of channels.
971 GMT_count_channels (struct MeshTunnel3 *t)
973 struct MeshTChannel *iter;
976 for (count = 0, iter = t->channel_head;
978 iter = iter->next, count++);
985 * Get the state of a tunnel.
989 * @return Tunnel's state.
991 enum MeshTunnel3State
992 GMT_get_state (struct MeshTunnel3 *t)
995 return (enum MeshTunnel3State) -1;
1000 * Get the total buffer space for a tunnel.
1003 * @param fwd Is this for FWD traffic?
1005 * @return Buffer space offered by all connections in the tunnel.
1008 GMT_get_buffer (struct MeshTunnel3 *t, int fwd)
1010 struct MeshTConnection *iter;
1011 unsigned int buffer;
1013 iter = t->connection_head;
1016 /* If terminal, return biggest channel buffer */
1017 if (NULL == iter || GMC_is_terminal (iter->c, fwd))
1019 struct MeshTChannel *iter_ch;
1020 unsigned int ch_buf;
1022 if (NULL == t->channel_head)
1025 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = iter_ch->next)
1027 ch_buf = GMCH_get_buffer (iter_ch->ch, fwd);
1028 if (ch_buf > buffer)
1034 /* If not terminal, return sum of connection buffers */
1035 while (NULL != iter)
1037 if (GMC_get_state (iter->c) != MESH_CONNECTION_READY)
1043 buffer += GMC_get_buffer (iter->c, fwd);
1052 * Get the tunnel's destination.
1056 * @return ID of the destination peer.
1058 const struct GNUNET_PeerIdentity *
1059 GMT_get_destination (struct MeshTunnel3 *t)
1061 return GMP_get_id (t->peer);
1066 * Get the tunnel's next free global channel ID.
1070 * @return GID of a channel free to use.
1073 GMT_get_next_chid (struct MeshTunnel3 *t)
1075 MESH_ChannelNumber chid;
1077 while (NULL != GMT_get_channel (t, t->next_chid))
1079 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
1080 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1082 chid = t->next_chid;
1083 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1090 * Sends an already built message on a tunnel, GMT_encrypting it and
1091 * choosing the best connection.
1093 * @param message Message to send. Function modifies it.
1094 * @param t Tunnel on which this message is transmitted.
1095 * @param ch Channel on which this message is transmitted.
1096 * @param fwd Is this a fwd message?
1099 GMT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1100 struct MeshTunnel3 *t,
1101 struct MeshChannel *ch,
1104 struct MeshConnection *c;
1105 struct GNUNET_MESH_Encrypted *msg;
1106 size_t size = ntohs (message->size);
1107 char *cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
1111 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send on Tunnel %s\n", GMP_2s (t->peer));
1113 iv = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_NONCE, UINT64_MAX);
1114 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
1115 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED);
1116 msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size);
1117 msg->iv = GNUNET_htonll (iv);
1118 GMT_encrypt (t, &msg[1], message, size, iv, fwd);
1119 c = tunnel_get_connection (t, fwd);
1122 GNUNET_break (GNUNET_YES == t->destroy);
1125 type = ntohs (message->type);
1128 case GNUNET_MESSAGE_TYPE_MESH_FWD:
1129 case GNUNET_MESSAGE_TYPE_MESH_BCK:
1130 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1131 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1132 msg->cid = *GMC_get_id (c);
1133 msg->ttl = htonl (default_ttl);
1136 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
1137 GNUNET_MESH_DEBUG_M2S (type));
1142 t->pending_messages++;
1143 GMC_send_prebuilt_message (&msg->header, c, ch, fwd);
1147 * Is the tunnel directed towards the local peer?
1151 * @return GNUNET_YES if it is loopback.
1154 GMT_is_loopback (const struct MeshTunnel3 *t)
1156 return (myid == GMP_get_short_id(t->peer));
1161 * Is the tunnel using this path already?
1166 * @return GNUNET_YES a connection uses this path.
1169 GMT_is_path_used (const struct MeshTunnel3 *t, const struct MeshPeerPath *p)
1171 struct MeshTConnection *iter;
1173 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1174 if (GMC_get_path (iter->c) == p)
1182 * Get a cost of a path for a tunnel considering existing connections.
1185 * @param path Candidate path.
1187 * @return Cost of the path (path length + number of overlapping nodes)
1190 GMT_get_path_cost (const struct MeshTunnel3 *t,
1191 const struct MeshPeerPath *path)
1193 struct MeshTConnection *iter;
1194 unsigned int overlap;
1202 GNUNET_assert (NULL != t);
1204 for (i = 0; i < path->length; i++)
1206 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1208 for (j = 0; j < GMC_get_path (iter->c)->length; j++)
1210 if (path->peers[i] == GMC_get_path (iter->c)->peers[j])
1218 return (path->length + overlap) * (path->score * -1);
1223 * Get the static string for the peer this tunnel is directed.
1227 * @return Static string the destination peer's ID.
1230 GMT_2s (const struct MeshTunnel3 *t)
1232 return GMP_2s (t->peer);