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_signatures.h"
25 #include "gnunet_statistics_service.h"
27 #include "mesh_protocol.h"
28 #include "mesh_path.h"
30 #include "gnunet-service-mesh_tunnel.h"
31 #include "gnunet-service-mesh_connection.h"
32 #include "gnunet-service-mesh_channel.h"
33 #include "gnunet-service-mesh_peer.h"
35 #define LOG(level, ...) GNUNET_log_from(level,"mesh-tun",__VA_ARGS__)
37 #define REKEY_WAIT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 5)
39 /******************************************************************************/
40 /******************************** STRUCTS **********************************/
41 /******************************************************************************/
45 struct MeshTChannel *next;
46 struct MeshTChannel *prev;
47 struct MeshChannel *ch;
50 struct MeshTConnection
52 struct MeshTConnection *next;
53 struct MeshTConnection *prev;
54 struct MeshConnection *c;
58 * Structure used during a Key eXchange.
60 struct MeshTunnelKXCtx
63 * Decryption ("their") old key, for decrypting traffic sent by the
64 * other end before the key exchange started.
66 struct GNUNET_CRYPTO_SymmetricSessionKey d_key_old;
69 * Challenge to send in a ping and expect in the pong.
75 * Struct containing all information regarding a tunnel to a peer.
80 * Endpoint of the tunnel.
82 struct MeshPeer *peer;
85 * State of the tunnel.
87 enum MeshTunnel3State state;
90 * Key eXchange context.
92 struct MeshTunnelKXCtx *kx_ctx;
95 * Encryption ("our") key.
97 struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
100 * Decryption ("their") key.
102 struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
105 * Task to start the rekey process.
107 GNUNET_SCHEDULER_TaskIdentifier rekey_task;
110 * Paths that are actively used to reach the destination peer.
112 struct MeshTConnection *connection_head;
113 struct MeshTConnection *connection_tail;
116 * Next connection number.
121 * Channels inside this tunnel.
123 struct MeshTChannel *channel_head;
124 struct MeshTChannel *channel_tail;
127 * Channel ID for the next created channel.
129 MESH_ChannelNumber next_chid;
132 * Destroy flag: if true, destroy on last message.
137 * Queued messages, to transmit once tunnel gets connected.
139 struct MeshTunnelDelayed *tq_head;
140 struct MeshTunnelDelayed *tq_tail;
145 * Struct used to save messages in a non-ready tunnel to send once connected.
147 struct MeshTunnelDelayed
152 struct MeshTunnelDelayed *next;
153 struct MeshTunnelDelayed *prev;
158 struct MeshChannel *ch;
163 /* struct GNUNET_MessageHeader *msg; */
168 * Handle for messages queued but not yet sent.
170 struct MeshTunnel3Queue
173 * Connection queue handle, to cancel if necessary.
175 struct MeshConnectionQueue *q;
178 * Continuation to call once sent.
183 * Closure for @c cont.
189 /******************************************************************************/
190 /******************************* GLOBALS ***********************************/
191 /******************************************************************************/
194 * Global handle to the statistics service.
196 extern struct GNUNET_STATISTICS_Handle *stats;
199 * Local peer own ID (memory efficient handle).
201 extern GNUNET_PEER_Id myid;
204 * Local peer own ID (full value).
206 extern struct GNUNET_PeerIdentity my_full_id;
210 * Set of all tunnels, in order to trigger a new exchange on rekey.
211 * Indexed by peer's ID.
213 static struct GNUNET_CONTAINER_MultiPeerMap *tunnels;
216 * Default TTL for payload packets.
218 static unsigned long long default_ttl;
223 const static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
226 * Own ephemeral private key.
228 static struct GNUNET_CRYPTO_EcdhePrivateKey *my_ephemeral_key;
231 * Cached message used to perform a key exchange.
233 static struct GNUNET_MESH_KX_Ephemeral kx_msg;
236 * Task to generate a new ephemeral key.
238 static GNUNET_SCHEDULER_TaskIdentifier rekey_task;
243 static struct GNUNET_TIME_Relative rekey_period;
245 /******************************************************************************/
246 /******************************** STATIC ***********************************/
247 /******************************************************************************/
250 * Get string description for tunnel state.
252 * @param s Tunnel state.
254 * @return String representation.
257 GMT_state2s (enum MeshTunnel3State s)
259 static char buf[128];
263 case MESH_TUNNEL3_NEW:
264 return "MESH_TUNNEL3_NEW";
265 case MESH_TUNNEL3_SEARCHING:
266 return "MESH_TUNNEL3_SEARCHING";
267 case MESH_TUNNEL3_WAITING:
268 return "MESH_TUNNEL3_WAITING";
269 case MESH_TUNNEL3_KEY_SENT:
270 return "MESH_TUNNEL3_KEY_SENT";
271 case MESH_TUNNEL3_READY:
272 return "MESH_TUNNEL3_READY";
273 case MESH_TUNNEL3_RECONNECTING:
274 return "MESH_TUNNEL3_RECONNECTING";
275 case MESH_TUNNEL3_REKEY:
276 return "MESH_TUNNEL3_REKEY";
279 sprintf (buf, "%u (UNKNOWN STATE)", s);
286 * Ephemeral key message purpose size.
288 * @return Size of the part of the ephemeral key message that must be signed.
291 ephemeral_purpose_size (void)
293 return sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
294 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
295 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
296 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
297 sizeof (struct GNUNET_PeerIdentity);
302 * Size of the encrypted part of a ping message.
304 * @return Size of the encrypted part of a ping message.
307 ping_encryption_size (void)
309 return sizeof (struct GNUNET_PeerIdentity) + sizeof (uint32_t);
314 * Get the channel's buffer. ONLY FOR NON-LOOPBACK CHANNELS!!
316 * @param tch Tunnel's channel handle.
318 * @return Amount of messages the channel can still buffer towards the client.
321 get_channel_buffer (const struct MeshTChannel *tch)
325 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
326 fwd = GMCH_is_origin (tch->ch, GNUNET_YES);
328 return GMCH_get_buffer (tch->ch, fwd);
333 * Get the channel's allowance status.
335 * @param tch Tunnel's channel handle.
337 * @return #GNUNET_YES if we allowed the client to send data to us.
340 get_channel_allowed (const struct MeshTChannel *tch)
344 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
345 fwd = GMCH_is_origin (tch->ch, GNUNET_YES);
347 return GMCH_get_allowed (tch->ch, fwd);
352 * Get the connection's buffer.
354 * @param tc Tunnel's connection handle.
356 * @return Amount of messages the connection can still buffer.
359 get_connection_buffer (const struct MeshTConnection *tc)
363 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
364 fwd = GMC_is_origin (tc->c, GNUNET_YES);
366 return GMC_get_buffer (tc->c, fwd);
371 * Get the connection's allowance.
373 * @param tc Tunnel's connection handle.
375 * @return Amount of messages we have allowed the next peer to send us.
378 get_connection_allowed (const struct MeshTConnection *tc)
382 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
383 fwd = GMC_is_origin (tc->c, GNUNET_YES);
385 return GMC_get_allowed (tc->c, fwd);
390 * Check that a ephemeral key message s well formed and correctly signed.
392 * @param t Tunnel on which the message came.
393 * @param msg The ephemeral key message.
395 * @return GNUNET_OK if message is fine, GNUNET_SYSERR otherwise.
398 check_ephemeral (struct MeshTunnel3 *t,
399 const struct GNUNET_MESH_KX_Ephemeral *msg)
401 /* Check message size */
402 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_KX_Ephemeral))
403 return GNUNET_SYSERR;
405 /* Check signature size */
406 if (ntohl (msg->purpose.size) != ephemeral_purpose_size ())
407 return GNUNET_SYSERR;
410 if (0 != memcmp (&msg->origin_identity,
411 GMP_get_id (t->peer),
412 sizeof (struct GNUNET_PeerIdentity)))
413 return GNUNET_SYSERR;
415 /* Check signature */
417 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_MESH_KX,
420 &msg->origin_identity.public_key))
421 return GNUNET_SYSERR;
428 * Encrypt data with the tunnel key.
430 * @param t Tunnel whose key to use.
431 * @param dst Destination for the encrypted data.
432 * @param src Source of the plaintext. Can overlap with @c dst.
433 * @param size Size of the plaintext.
434 * @param iv Initialization Vector to use.
437 t_encrypt (struct MeshTunnel3 *t,
438 void *dst, const void *src,
439 size_t size, uint32_t iv)
441 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
443 GNUNET_CRYPTO_symmetric_derive_iv (&siv, &t->e_key, &iv, sizeof (uint32_t), NULL);
444 return GNUNET_CRYPTO_symmetric_encrypt (src, size, &t->e_key, &siv, dst);
449 * Decrypt data with the tunnel key.
451 * @param t Tunnel whose key to use.
452 * @param dst Destination for the plaintext.
453 * @param src Source of the encrypted data. Can overlap with @c dst.
454 * @param size Size of the encrypted data.
455 * @param iv Initialization Vector to use.
458 t_decrypt (struct MeshTunnel3 *t,
459 void *dst, const void *src,
460 size_t size, uint32_t iv)
462 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
464 GNUNET_CRYPTO_symmetric_derive_iv (&siv, &t->d_key, &iv, sizeof (uint32_t), NULL);
465 return GNUNET_CRYPTO_symmetric_decrypt (src, size, &t->d_key, &siv, dst);
470 * Create key material by doing ECDH on the local and remote ephemeral keys.
472 * @param key_material Where to store the key material.
473 * @param ephemeral_key Peer's public ephemeral key.
476 derive_key_material (struct GNUNET_HashCode *key_material,
477 const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key)
480 GNUNET_CRYPTO_ecc_ecdh (my_ephemeral_key,
489 * Create a symmetic key from the identities of both ends and the key material
492 * @param key Destination for the generated key.
493 * @param sender ID of the peer that will encrypt with @c key.
494 * @param receiver ID of the peer that will decrypt with @c key.
495 * @param key_material Hash created with ECDH with the ephemeral keys.
498 derive_symmertic (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
499 const struct GNUNET_PeerIdentity *sender,
500 const struct GNUNET_PeerIdentity *receiver,
501 const struct GNUNET_HashCode *key_material)
503 const char salt[] = "MESH kx salt";
505 GNUNET_CRYPTO_kdf (key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
507 key_material, sizeof (struct GNUNET_HashCode),
508 sender, sizeof (struct GNUNET_PeerIdentity),
509 receiver, sizeof (struct GNUNET_PeerIdentity),
514 * Pick a connection on which send the next data message.
516 * @param t Tunnel on which to send the message.
518 * @return The connection on which to send the next message.
520 static struct MeshConnection *
521 tunnel_get_connection (struct MeshTunnel3 *t)
523 struct MeshTConnection *iter;
524 struct MeshConnection *best;
526 unsigned int lowest_q;
528 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GMP_2s (t->peer));
531 for (iter = t->connection_head; NULL != iter; iter = iter->next)
533 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
534 GNUNET_h2s (GMC_get_id (iter->c)), GMC_get_state (iter->c));
535 if (MESH_CONNECTION_READY == GMC_get_state (iter->c))
537 qn = GMC_get_qn (iter->c, GMC_is_origin (iter->c, GNUNET_YES));
538 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
551 * Send all cached messages that we can, tunnel is online.
553 * @param t Tunnel that holds the messages. Cannot be loopback.
556 send_queued_data (struct MeshTunnel3 *t)
558 struct MeshTunnelDelayed *tq;
559 struct MeshTunnelDelayed *next;
562 LOG (GNUNET_ERROR_TYPE_DEBUG,
563 "GMT_send_queued_data on tunnel %s\n",
566 if (GMT_is_loopback (t))
572 room = GMT_get_connections_buffer (t);
573 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
574 for (tq = t->tq_head; NULL != tq && room > 0; tq = next)
576 LOG (GNUNET_ERROR_TYPE_DEBUG, " data on channel %s\n", GMCH_2s (tq->ch));
579 GNUNET_CONTAINER_DLL_remove (t->tq_head, t->tq_tail, tq);
580 GMCH_send_prebuilt_message ((struct GNUNET_MessageHeader *) &tq[1],
581 tq->ch, GMCH_is_origin (tq->ch, GNUNET_YES));
585 LOG (GNUNET_ERROR_TYPE_DEBUG,
586 "GMT_send_queued_data end\n",
594 * Cache a message to be sent once tunnel is online.
596 * @param t Tunnel to hold the message.
597 * @param ch Channel the message is about.
598 * @param msg Message itself (copy will be made).
601 queue_data (struct MeshTunnel3 *t,
602 struct MeshChannel *ch,
603 const struct GNUNET_MessageHeader *msg)
605 struct MeshTunnelDelayed *tq;
606 uint16_t size = ntohs (msg->size);
608 if (MESH_TUNNEL3_READY == t->state)
614 tq = GNUNET_malloc (sizeof (struct MeshTunnelDelayed) + size);
617 memcpy (&tq[1], msg, size);
618 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tq);
624 * Sends key exchange message on a tunnel, choosing the best connection.
625 * Should not be called on loopback tunnels.
627 * @param t Tunnel on which this message is transmitted.
628 * @param message Message to send. Function modifies it.
631 send_kx (struct MeshTunnel3 *t,
632 const struct GNUNET_MessageHeader *message)
634 struct MeshConnection *c;
635 struct GNUNET_MESH_KX *msg;
636 size_t size = ntohs (message->size);
637 char cbuf[sizeof (struct GNUNET_MESH_KX) + size];
641 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT KX on Tunnel %s\n", GMT_2s (t));
643 /* Avoid loopback. */
644 if (GMT_is_loopback (t))
646 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback!\n");
651 /* Must have a connection. */
652 if (NULL == t->connection_head)
658 msg = (struct GNUNET_MESH_KX *) cbuf;
659 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX);
660 msg->header.size = htons (sizeof (struct GNUNET_MESH_KX) + size);
661 c = tunnel_get_connection (t);
664 GNUNET_break (GNUNET_YES == t->destroy);
667 type = ntohs (message->type);
670 case GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL:
671 case GNUNET_MESSAGE_TYPE_MESH_KX_PING:
672 case GNUNET_MESSAGE_TYPE_MESH_KX_PONG:
673 msg->reserved = htonl (0);
674 memcpy (&msg[1], message, size);
677 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
678 GNUNET_MESH_DEBUG_M2S (type));
682 fwd = GMC_is_origin (t->connection_head->c, GNUNET_YES);
683 /* TODO save handle and cancel in case of a unneeded retransmission */
684 GMC_send_prebuilt_message (&msg->header, c, fwd, NULL, NULL);
689 * Send the ephemeral key on a tunnel.
691 * @param t Tunnel on which to send the key.
694 send_ephemeral (struct MeshTunnel3 *t)
696 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __FUNCTION__);
698 kx_msg.sender_status = htonl (t->state);
699 send_kx (t, &kx_msg.header);
703 * Send a ping message on a tunnel.
705 * @param t Tunnel on which to send the ping.
708 send_ping (struct MeshTunnel3 *t)
710 struct GNUNET_MESH_KX_Ping msg;
712 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __FUNCTION__);
713 msg.header.size = htons (sizeof (msg));
714 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_PING);
715 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
716 msg.target = *GMP_get_id (t->peer);
717 msg.nonce = t->kx_ctx->challenge;
719 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
720 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&msg.target));
721 t_encrypt (t, &msg.target, &msg.target, ping_encryption_size(), msg.iv);
722 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
723 LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg.target));
725 send_kx (t, &msg.header);
730 * Send a pong message on a tunnel.
732 * @param t Tunnel on which to send the pong.
733 * @param challenge Value sent in the ping that we have to send back.
736 send_pong (struct MeshTunnel3 *t, uint32_t challenge)
738 struct GNUNET_MESH_KX_Pong msg;
740 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __FUNCTION__);
741 msg.header.size = htons (sizeof (msg));
742 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_PONG);
743 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
744 msg.nonce = challenge;
745 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
746 t_encrypt (t, &msg.nonce, &msg.nonce, sizeof (msg.nonce), msg.iv);
747 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
749 send_kx (t, &msg.header);
754 * Initiate a rekey with the remote peer.
756 * @param cls Closure (tunnel).
757 * @param tc TaskContext.
760 rekey_tunnel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
762 struct MeshTunnel3 *t = cls;
764 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
766 LOG (GNUNET_ERROR_TYPE_DEBUG, "Re-key Tunnel\n");
767 if (NULL != tc && 0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
770 if (NULL == t->kx_ctx)
772 LOG (GNUNET_ERROR_TYPE_DEBUG, " new kx ctx\n");
773 t->kx_ctx = GNUNET_new (struct MeshTunnelKXCtx);
774 t->kx_ctx->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
776 t->kx_ctx->d_key_old = t->d_key;
779 if (MESH_TUNNEL3_READY == t->state || MESH_TUNNEL3_REKEY == t->state)
782 t->state = MESH_TUNNEL3_REKEY;
784 else if (MESH_TUNNEL3_WAITING == t->state)
786 t->state = MESH_TUNNEL3_KEY_SENT;
790 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unexpected state %u\n", t->state);
793 LOG (GNUNET_ERROR_TYPE_DEBUG, " next call in %s\n",
794 GNUNET_STRINGS_relative_time_to_string (REKEY_WAIT, GNUNET_YES));
795 t->rekey_task = GNUNET_SCHEDULER_add_delayed (REKEY_WAIT, &rekey_tunnel, t);
800 * Out ephemeral key has changed, create new session key on all tunnels.
802 * @param cls Closure (size of the hashmap).
803 * @param key Current public key.
804 * @param value Value in the hash map (tunnel).
806 * @return #GNUNET_YES, so we should continue to iterate,
809 rekey_iterator (void *cls,
810 const struct GNUNET_PeerIdentity *key,
813 struct MeshTunnel3 *t = value;
814 struct GNUNET_TIME_Relative delay;
818 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
821 r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, (uint32_t) n * 100);
822 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, r);
823 t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
830 * Create a new ephemeral key and key message, schedule next rekeying.
832 * @param cls Closure (unused).
833 * @param tc TaskContext.
836 rekey (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
838 struct GNUNET_TIME_Absolute time;
841 rekey_task = GNUNET_SCHEDULER_NO_TASK;
843 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
846 GNUNET_free_non_null (my_ephemeral_key);
847 my_ephemeral_key = GNUNET_CRYPTO_ecdhe_key_create ();
849 time = GNUNET_TIME_absolute_get ();
850 kx_msg.creation_time = GNUNET_TIME_absolute_hton (time);
851 time = GNUNET_TIME_absolute_add (time, rekey_period);
852 time = GNUNET_TIME_absolute_add (time, GNUNET_TIME_UNIT_MINUTES);
853 kx_msg.expiration_time = GNUNET_TIME_absolute_hton (time);
854 GNUNET_CRYPTO_ecdhe_key_get_public (my_ephemeral_key, &kx_msg.ephemeral_key);
856 GNUNET_assert (GNUNET_OK ==
857 GNUNET_CRYPTO_eddsa_sign (my_private_key,
861 n = (long) GNUNET_CONTAINER_multipeermap_size (tunnels);
862 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &rekey_iterator, (void *) n);
864 rekey_task = GNUNET_SCHEDULER_add_delayed (rekey_period, &rekey, NULL);
869 * Demultiplex data per channel and call appropriate channel handler.
871 * @param t Tunnel on which the data came.
872 * @param msg Data message.
873 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
874 * #GNUNET_YES if message is FWD on the respective channel (loopback)
875 * #GNUNET_NO if message is BCK on the respective channel (loopback)
876 * #GNUNET_SYSERR if message on a one-ended channel (remote)
879 handle_data (struct MeshTunnel3 *t,
880 const struct GNUNET_MESH_Data *msg,
883 struct MeshChannel *ch;
888 size = ntohs (msg->header.size);
890 sizeof (struct GNUNET_MESH_Data) +
891 sizeof (struct GNUNET_MessageHeader))
896 type = ntohs (msg->header.type);
897 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a %s message\n",
898 GNUNET_MESH_DEBUG_M2S (type));
899 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
900 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
903 ch = GMT_get_channel (t, ntohl (msg->chid));
906 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
908 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
913 GMT_change_state (t, MESH_TUNNEL3_READY);
914 GMCH_handle_data (ch, msg, fwd);
919 * Demultiplex data ACKs per channel and update appropriate channel buffer info.
921 * @param t Tunnel on which the DATA ACK came.
922 * @param msg DATA ACK message.
923 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
924 * #GNUNET_YES if message is FWD on the respective channel (loopback)
925 * #GNUNET_NO if message is BCK on the respective channel (loopback)
926 * #GNUNET_SYSERR if message on a one-ended channel (remote)
929 handle_data_ack (struct MeshTunnel3 *t,
930 const struct GNUNET_MESH_DataACK *msg,
933 struct MeshChannel *ch;
937 size = ntohs (msg->header.size);
938 if (size != sizeof (struct GNUNET_MESH_DataACK))
945 ch = GMT_get_channel (t, ntohl (msg->chid));
948 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
950 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
955 GMCH_handle_data_ack (ch, msg, fwd);
960 * Handle channel create.
962 * @param t Tunnel on which the data came.
963 * @param msg Data message.
966 handle_ch_create (struct MeshTunnel3 *t,
967 const struct GNUNET_MESH_ChannelCreate *msg)
969 struct MeshChannel *ch;
973 size = ntohs (msg->header.size);
974 if (size != sizeof (struct GNUNET_MESH_ChannelCreate))
981 ch = GMT_get_channel (t, ntohl (msg->chid));
982 if (NULL != ch && ! GMT_is_loopback (t))
984 /* Probably a retransmission, safe to ignore */
985 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
989 ch = GMCH_handle_create (t, msg);
992 GMT_add_channel (t, ch);
998 * Handle channel NACK: check correctness and call channel handler for NACKs.
1000 * @param t Tunnel on which the NACK came.
1001 * @param msg NACK message.
1004 handle_ch_nack (struct MeshTunnel3 *t,
1005 const struct GNUNET_MESH_ChannelManage *msg)
1007 struct MeshChannel *ch;
1011 size = ntohs (msg->header.size);
1012 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1019 ch = GMT_get_channel (t, ntohl (msg->chid));
1022 GNUNET_STATISTICS_update (stats, "# channel NACK on unknown channel",
1024 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1029 GMCH_handle_nack (ch);
1034 * Handle a CHANNEL ACK (SYNACK/ACK).
1036 * @param t Tunnel on which the CHANNEL ACK came.
1037 * @param msg CHANNEL ACK message.
1038 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1039 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1040 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1041 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1044 handle_ch_ack (struct MeshTunnel3 *t,
1045 const struct GNUNET_MESH_ChannelManage *msg,
1048 struct MeshChannel *ch;
1052 size = ntohs (msg->header.size);
1053 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1060 ch = GMT_get_channel (t, ntohl (msg->chid));
1063 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
1065 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1070 GMCH_handle_ack (ch, msg, fwd);
1076 * Handle a channel destruction message.
1078 * @param t Tunnel on which the message came.
1079 * @param msg Channel destroy message.
1080 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1081 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1082 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1083 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1086 handle_ch_destroy (struct MeshTunnel3 *t,
1087 const struct GNUNET_MESH_ChannelManage *msg,
1090 struct MeshChannel *ch;
1094 size = ntohs (msg->header.size);
1095 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1102 ch = GMT_get_channel (t, ntohl (msg->chid));
1105 /* Probably a retransmission, safe to ignore */
1109 GMCH_handle_destroy (ch, msg, fwd);
1114 * The peer's ephemeral key has changed: update the symmetrical keys.
1116 * @param t Tunnel this message came on.
1117 * @param msg Key eXchange message.
1120 handle_ephemeral (struct MeshTunnel3 *t,
1121 const struct GNUNET_MESH_KX_Ephemeral *msg)
1123 struct GNUNET_HashCode km;
1124 LOG (GNUNET_ERROR_TYPE_DEBUG, " ephemeral key message\n");
1126 if (GNUNET_OK != check_ephemeral (t, msg))
1128 GNUNET_break_op (0);
1131 derive_key_material (&km, &msg->ephemeral_key);
1132 LOG (GNUNET_ERROR_TYPE_DEBUG, " km is %s\n", GNUNET_h2s (&km));
1133 derive_symmertic (&t->e_key, &my_full_id, GMP_get_id (t->peer), &km);
1134 derive_symmertic (&t->d_key, GMP_get_id (t->peer), &my_full_id, &km);
1135 if (MESH_TUNNEL3_KEY_SENT == t->state)
1137 LOG (GNUNET_ERROR_TYPE_DEBUG, " our key was sent, send ping\n");
1139 t->state = MESH_TUNNEL3_REKEY;
1145 * Peer wants to check our symmetrical keys by sending an encrypted challenge.
1146 * Answer with by retransmitting the challenge with the "opposite" key.
1148 * @param t Tunnel this message came on.
1149 * @param msg Key eXchange Ping message.
1152 handle_ping (struct MeshTunnel3 *t,
1153 const struct GNUNET_MESH_KX_Ping *msg)
1155 struct GNUNET_MESH_KX_Ping res;
1157 if (ntohs (msg->header.size) != sizeof (res))
1159 GNUNET_break_op (0);
1163 LOG (GNUNET_ERROR_TYPE_DEBUG, " ping message\n");
1164 t_decrypt (t, &res.target, &msg->target, ping_encryption_size (), msg->iv);
1165 if (0 != memcmp (&my_full_id, &res.target, sizeof (my_full_id)))
1167 GNUNET_break_op (0);
1168 LOG (GNUNET_ERROR_TYPE_DEBUG, " e got %u\n", msg->nonce);
1169 LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg->target));
1170 LOG (GNUNET_ERROR_TYPE_DEBUG, " got %u\n", res.nonce);
1171 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&res.target));
1175 send_pong (t, res.nonce);
1180 * Peer has answer to our challenge.
1181 * If answer is successful, consider the key exchange finished and clean
1182 * up all related state.
1184 * @param t Tunnel this message came on.
1185 * @param msg Key eXchange Pong message.
1188 handle_pong (struct MeshTunnel3 *t,
1189 const struct GNUNET_MESH_KX_Pong *msg)
1193 LOG (GNUNET_ERROR_TYPE_DEBUG, "PONG received\n");
1194 if (GNUNET_SCHEDULER_NO_TASK == t->rekey_task)
1196 GNUNET_break_op (0);
1199 t_decrypt (t, &challenge, &msg->nonce, sizeof (uint32_t), msg->iv);
1201 if (challenge != t->kx_ctx->challenge)
1203 LOG (GNUNET_ERROR_TYPE_DEBUG,
1204 "Wrong PONG challenge: %u (e: %u). Expected: %u.\n",
1205 challenge, msg->nonce, t->kx_ctx->challenge);
1206 GNUNET_break_op (0);
1209 GNUNET_SCHEDULER_cancel (t->rekey_task);
1210 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
1211 GNUNET_free (t->kx_ctx);
1213 t->state = MESH_TUNNEL3_READY;
1214 send_queued_data (t);
1219 * Demultiplex by message type and call appropriate handler for a message
1220 * towards a channel of a local tunnel.
1222 * @param t Tunnel this message came on.
1223 * @param msgh Message header.
1224 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1225 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1226 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1227 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1230 handle_decrypted (struct MeshTunnel3 *t,
1231 const struct GNUNET_MessageHeader *msgh,
1236 type = ntohs (msgh->type);
1237 LOG (GNUNET_ERROR_TYPE_DEBUG,
1238 "Got a %s message!\n",
1239 GNUNET_MESH_DEBUG_M2S (type));
1243 case GNUNET_MESSAGE_TYPE_MESH_DATA:
1244 /* Don't send hop ACK, wait for client to ACK */
1245 handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
1248 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
1249 handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
1252 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1253 handle_ch_create (t,
1254 (struct GNUNET_MESH_ChannelCreate *) msgh);
1257 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK:
1259 (struct GNUNET_MESH_ChannelManage *) msgh);
1262 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
1264 (struct GNUNET_MESH_ChannelManage *) msgh,
1268 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1269 handle_ch_destroy (t,
1270 (struct GNUNET_MESH_ChannelManage *) msgh,
1275 GNUNET_break_op (0);
1276 LOG (GNUNET_ERROR_TYPE_DEBUG,
1277 "end-to-end message not known (%u)\n",
1278 ntohs (msgh->type));
1282 /******************************************************************************/
1283 /******************************** API ***********************************/
1284 /******************************************************************************/
1287 * Decrypt and demultiplex by message type. Call appropriate handler
1288 * for every message.
1290 * @param t Tunnel this message came on.
1291 * @param msg Encrypted message.
1294 GMT_handle_encrypted (struct MeshTunnel3 *t,
1295 const struct GNUNET_MESH_Encrypted *msg)
1297 size_t size = ntohs (msg->header.size);
1298 size_t payload_size = size - sizeof (struct GNUNET_MESH_Encrypted);
1299 size_t decrypted_size;
1300 char cbuf [payload_size];
1301 struct GNUNET_MessageHeader *msgh;
1304 decrypted_size = t_decrypt (t, cbuf, &msg[1], payload_size, msg->iv);
1306 while (off < decrypted_size)
1308 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
1309 handle_decrypted (t, msgh, GNUNET_SYSERR);
1310 off += ntohs (msgh->size);
1316 * Demultiplex an encapsulated KX message by message type.
1318 * @param t Tunnel on which the message came.
1319 * @param message Payload of KX message.
1322 GMT_handle_kx (struct MeshTunnel3 *t,
1323 const struct GNUNET_MessageHeader *message)
1327 type = ntohs (message->type);
1328 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message received\n", type);
1331 case GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL:
1332 handle_ephemeral (t, (struct GNUNET_MESH_KX_Ephemeral *) message);
1335 case GNUNET_MESSAGE_TYPE_MESH_KX_PING:
1336 handle_ping (t, (struct GNUNET_MESH_KX_Ping *) message);
1339 case GNUNET_MESSAGE_TYPE_MESH_KX_PONG:
1340 handle_pong (t, (struct GNUNET_MESH_KX_Pong *) message);
1344 GNUNET_break_op (0);
1345 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message not known (%u)\n", type);
1351 * Initialize the tunnel subsystem.
1353 * @param c Configuration handle.
1354 * @param key ECC private key, to derive all other keys and do crypto.
1357 GMT_init (const struct GNUNET_CONFIGURATION_Handle *c,
1358 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
1360 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
1362 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
1365 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1366 "MESH", "DEFAULT_TTL", "USING DEFAULT");
1370 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REKEY_PERIOD",
1373 rekey_period = GNUNET_TIME_UNIT_DAYS;
1376 my_private_key = key;
1377 kx_msg.header.size = htons (sizeof (kx_msg));
1378 kx_msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL);
1379 kx_msg.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_MESH_KX);
1380 kx_msg.purpose.size = htonl (ephemeral_purpose_size ());
1381 kx_msg.origin_identity = my_full_id;
1382 rekey_task = GNUNET_SCHEDULER_add_now (&rekey, NULL);
1384 tunnels = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1389 * Shut down the tunnel subsystem.
1394 if (GNUNET_SCHEDULER_NO_TASK != rekey_task)
1396 GNUNET_SCHEDULER_cancel (rekey_task);
1397 rekey_task = GNUNET_SCHEDULER_NO_TASK;
1399 GNUNET_CONTAINER_multipeermap_destroy (tunnels);
1406 * @param destination Peer this tunnel is towards.
1408 struct MeshTunnel3 *
1409 GMT_new (struct MeshPeer *destination)
1411 struct MeshTunnel3 *t;
1413 t = GNUNET_new (struct MeshTunnel3);
1415 t->peer = destination;
1418 GNUNET_CONTAINER_multipeermap_put (tunnels, GMP_get_id (destination), t,
1419 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1430 * Change the tunnel state.
1432 * @param t Tunnel whose state to change.
1433 * @param state New state.
1436 GMT_change_state (struct MeshTunnel3* t, enum MeshTunnel3State state)
1440 LOG (GNUNET_ERROR_TYPE_DEBUG,
1441 "Tunnel %s state was %s\n",
1443 GMT_state2s (t->state));
1444 LOG (GNUNET_ERROR_TYPE_DEBUG,
1445 "Tunnel %s state is now %s\n",
1447 GMT_state2s (state));
1448 if (myid != GMP_get_short_id (t->peer) &&
1449 MESH_TUNNEL3_WAITING == t->state && MESH_TUNNEL3_READY == state)
1451 LOG (GNUNET_ERROR_TYPE_DEBUG, " triggered rekey\n");
1452 rekey_tunnel (t, NULL);
1453 LOG (GNUNET_ERROR_TYPE_DEBUG,
1454 "Tunnel %s state is now %s\n",
1456 GMT_state2s (t->state));
1462 if (MESH_TUNNEL3_READY == state && 3 <= GMT_count_connections (t))
1464 GMP_stop_search (t->peer);
1470 * Add a connection to a tunnel.
1473 * @param c Connection.
1476 GMT_add_connection (struct MeshTunnel3 *t, struct MeshConnection *c)
1478 struct MeshTConnection *aux;
1480 for (aux = t->connection_head; aux != NULL; aux = aux->next)
1484 aux = GNUNET_new (struct MeshTConnection);
1486 GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, aux);
1491 * Remove a connection from a tunnel.
1494 * @param c Connection.
1497 GMT_remove_connection (struct MeshTunnel3 *t, struct MeshConnection *c)
1499 struct MeshTConnection *aux;
1501 for (aux = t->connection_head; aux != NULL; aux = aux->next)
1504 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
1512 * Add a channel to a tunnel.
1515 * @param ch Channel.
1518 GMT_add_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
1520 struct MeshTChannel *aux;
1522 GNUNET_assert (NULL != ch);
1524 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
1526 for (aux = t->channel_head; aux != NULL; aux = aux->next)
1528 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
1533 aux = GNUNET_new (struct MeshTChannel);
1535 LOG (GNUNET_ERROR_TYPE_DEBUG, " adding %p to %p\n", aux, t->channel_head);
1536 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
1541 * Remove a channel from a tunnel.
1544 * @param ch Channel.
1547 GMT_remove_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
1549 struct MeshTChannel *aux;
1551 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
1552 for (aux = t->channel_head; aux != NULL; aux = aux->next)
1556 LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GMCH_2s (ch));
1557 GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
1566 * Search for a channel by global ID.
1568 * @param t Tunnel containing the channel.
1569 * @param chid Public channel number.
1571 * @return channel handler, NULL if doesn't exist
1573 struct MeshChannel *
1574 GMT_get_channel (struct MeshTunnel3 *t, MESH_ChannelNumber chid)
1576 struct MeshTChannel *iter;
1581 for (iter = t->channel_head; NULL != iter; iter = iter->next)
1583 if (GMCH_get_id (iter->ch) == chid)
1587 return NULL == iter ? NULL : iter->ch;
1592 * Tunnel is empty: destroy it.
1594 * Notifies all connections about the destruction.
1596 * @param t Tunnel to destroy.
1599 GMT_destroy_empty (struct MeshTunnel3 *t)
1601 struct MeshTConnection *iter;
1603 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1605 GMC_send_destroy (iter->c);
1608 t->destroy = GNUNET_YES;
1613 * Destroy tunnel if empty (no more channels).
1615 * @param t Tunnel to destroy if empty.
1618 GMT_destroy_if_empty (struct MeshTunnel3 *t)
1620 if (1 < GMT_count_channels (t))
1623 GMT_destroy_empty (t);
1628 * Destroy the tunnel.
1630 * This function does not generate any warning traffic to clients or peers.
1633 * Cancel messages belonging to this tunnel queued to neighbors.
1634 * Free any allocated resources linked to the tunnel.
1636 * @param t The tunnel to destroy.
1639 GMT_destroy (struct MeshTunnel3 *t)
1641 struct MeshTConnection *iter;
1642 struct MeshTConnection *next;
1647 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GMP_2s (t->peer));
1649 // if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t))
1650 // GNUNET_break (0);
1652 for (iter = t->connection_head; NULL != iter; iter = next)
1655 GMC_destroy (iter->c);
1658 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
1659 GMP_set_tunnel (t->peer, NULL);
1661 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
1662 GNUNET_SCHEDULER_cancel (t->rekey_task);
1669 * @brief Use the given path for the tunnel.
1670 * Update the next and prev hops (and RCs).
1671 * (Re)start the path refresh in case the tunnel is locally owned.
1673 * @param t Tunnel to update.
1674 * @param p Path to use.
1676 * @return Connection created.
1678 struct MeshConnection *
1679 GMT_use_path (struct MeshTunnel3 *t, struct MeshPeerPath *p)
1681 struct MeshConnection *c;
1682 struct GNUNET_HashCode cid;
1683 unsigned int own_pos;
1685 if (NULL == t || NULL == p)
1691 for (own_pos = 0; own_pos < p->length; own_pos++)
1693 if (p->peers[own_pos] == myid)
1696 if (own_pos > p->length - 1)
1702 GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE, &cid);
1703 c = GMC_new (&cid, t, p, own_pos);
1704 GMT_add_connection (t, c);
1710 * Count established (ready) connections of a tunnel.
1712 * @param t Tunnel on which to count.
1714 * @return Number of connections.
1717 GMT_count_connections (struct MeshTunnel3 *t)
1719 struct MeshTConnection *iter;
1722 for (count = 0, iter = t->connection_head;
1724 iter = iter->next, count++);
1730 * Count channels of a tunnel.
1732 * @param t Tunnel on which to count.
1734 * @return Number of channels.
1737 GMT_count_channels (struct MeshTunnel3 *t)
1739 struct MeshTChannel *iter;
1742 for (count = 0, iter = t->channel_head;
1744 iter = iter->next, count++) /* skip */;
1751 * Get the state of a tunnel.
1755 * @return Tunnel's state.
1757 enum MeshTunnel3State
1758 GMT_get_state (struct MeshTunnel3 *t)
1763 return (enum MeshTunnel3State) -1;
1770 * Get the maximum buffer space for a tunnel towards a local client.
1774 * @return Biggest buffer space offered by any channel in the tunnel.
1777 GMT_get_channels_buffer (struct MeshTunnel3 *t)
1779 struct MeshTChannel *iter;
1780 unsigned int buffer;
1781 unsigned int ch_buf;
1783 if (NULL == t->channel_head)
1785 /* Probably getting buffer for a channel create/handshake. */
1790 for (iter = t->channel_head; NULL != iter; iter = iter->next)
1792 ch_buf = get_channel_buffer (iter);
1793 if (ch_buf > buffer)
1801 * Get the total buffer space for a tunnel for P2P traffic.
1805 * @return Buffer space offered by all connections in the tunnel.
1808 GMT_get_connections_buffer (struct MeshTunnel3 *t)
1810 struct MeshTConnection *iter;
1811 unsigned int buffer;
1813 iter = t->connection_head;
1815 while (NULL != iter)
1817 if (GMC_get_state (iter->c) != MESH_CONNECTION_READY)
1823 buffer += get_connection_buffer (iter);
1832 * Get the tunnel's destination.
1836 * @return ID of the destination peer.
1838 const struct GNUNET_PeerIdentity *
1839 GMT_get_destination (struct MeshTunnel3 *t)
1841 return GMP_get_id (t->peer);
1846 * Get the tunnel's next free global channel ID.
1850 * @return GID of a channel free to use.
1853 GMT_get_next_chid (struct MeshTunnel3 *t)
1855 MESH_ChannelNumber chid;
1857 while (NULL != GMT_get_channel (t, t->next_chid))
1859 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
1860 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1862 chid = t->next_chid;
1863 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1870 * Send ACK on one or more channels due to buffer in connections.
1872 * @param t Channel which has some free buffer space.
1875 GMT_unchoke_channels (struct MeshTunnel3 *t)
1877 struct MeshTChannel *iter;
1878 unsigned int buffer;
1879 unsigned int channels = GMT_count_channels (t);
1880 unsigned int choked_n;
1881 struct MeshChannel *choked[channels];
1883 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_unchoke_channels on %s\n", GMT_2s (t));
1884 LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
1885 if (NULL != t->channel_head)
1886 LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
1888 /* Get buffer space */
1889 buffer = GMT_get_connections_buffer (t);
1895 /* Count and remember choked channels */
1897 for (iter = t->channel_head; NULL != iter; iter = iter->next)
1899 if (GNUNET_NO == get_channel_allowed (iter))
1901 choked[choked_n++] = iter->ch;
1905 /* Unchoke random channels */
1906 while (0 < buffer && 0 < choked_n)
1908 unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1910 GMCH_allow_client (choked[r], GMCH_is_origin (choked[r], GNUNET_YES));
1913 choked[r] = choked[choked_n];
1919 * Send ACK on one or more connections due to buffer space to the client.
1921 * Iterates all connections of the tunnel and sends ACKs appropriately.
1926 GMT_send_connection_acks (struct MeshTunnel3 *t)
1928 struct MeshTConnection *iter;
1931 uint32_t allow_per_connection;
1933 unsigned int buffer;
1935 LOG (GNUNET_ERROR_TYPE_DEBUG,
1936 "Tunnel send connection ACKs on %s\n",
1945 buffer = GMT_get_channels_buffer (t);
1947 /* Count connections, how many messages are already allowed */
1948 cs = GMT_count_connections (t);
1949 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
1951 allowed += get_connection_allowed (iter);
1954 /* Make sure there is no overflow */
1955 if (allowed > buffer)
1960 /* Authorize connections to send more data */
1961 to_allow = buffer; /* - allowed; */
1963 for (iter = t->connection_head; NULL != iter && to_allow > 0; iter = iter->next)
1965 allow_per_connection = to_allow/cs;
1966 to_allow -= allow_per_connection;
1968 if (get_connection_allowed (iter) > 64 / 3)
1972 GMC_allow (iter->c, buffer, GMC_is_origin (iter->c, GNUNET_YES));
1975 GNUNET_break (to_allow == 0);
1980 * Callback called when a queued message is sent.
1982 * Calculates the average time and connection packet tracking.
1984 * @param cls Closure (TunnelQueue handle).
1985 * @param c Connection this message was on.
1986 * @param type Type of message sent.
1987 * @param fwd Was this a FWD going message?
1988 * @param size Size of the message.
1991 message_sent (void *cls,
1992 struct MeshConnection *c,
1993 struct MeshConnectionQueue *q,
1994 uint16_t type, int fwd, size_t size)
1996 struct MeshTunnel3Queue *qt = cls;
1998 GNUNET_assert (NULL != qt->cont);
1999 qt->cont (qt->cont_cls, GMC_get_tunnel (c), qt, type, size);
2004 * Sends an already built message on a tunnel, encrypting it and
2005 * choosing the best connection.
2007 * @param message Message to send. Function modifies it.
2008 * @param t Tunnel on which this message is transmitted.
2009 * @param ch Channel on which this message is transmitted.
2010 * @param fwd Is this a fwd message on @c ch?
2011 * @param cont Continuation to call once message is really sent.
2012 * @param cont_cls Closure for @c cont.
2014 * @return Handle to cancel message. NULL if @c cont is NULL.
2016 struct MeshTunnel3Queue *
2017 GMT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2018 struct MeshTunnel3 *t,
2019 struct MeshChannel *ch, int fwd,
2020 GMT_sent cont, void *cont_cls)
2022 struct MeshTunnel3Queue *q;
2023 struct MeshConnection *c;
2024 struct GNUNET_MESH_Encrypted *msg;
2025 size_t size = ntohs (message->size);
2026 size_t encrypted_size;
2027 char cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
2031 if (MESH_TUNNEL3_READY != t->state)
2033 queue_data (t, ch, message);
2037 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GMT_2s (t));
2039 if (GMT_is_loopback (t))
2041 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback!\n");
2042 handle_decrypted (t, message, fwd);
2043 /* FIXME: call cont? */
2044 return NULL; /* Already delivered, cannot cancel */
2047 iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
2048 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
2049 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED);
2051 encrypted_size = t_encrypt (t, &msg[1], message, size, iv);
2052 msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + encrypted_size);
2053 c = tunnel_get_connection (t);
2056 GNUNET_break (GNUNET_YES == t->destroy);
2059 type = ntohs (message->type);
2062 case GNUNET_MESSAGE_TYPE_MESH_DATA:
2063 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
2064 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
2065 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
2066 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
2067 msg->cid = *GMC_get_id (c);
2068 msg->ttl = htonl (default_ttl);
2071 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
2072 GNUNET_MESH_DEBUG_M2S (type));
2076 fwd = GMC_is_origin (c, GNUNET_YES);
2080 (void) GMC_send_prebuilt_message (&msg->header, c, fwd, NULL, NULL);
2083 q = GNUNET_new (struct MeshTunnel3Queue);
2084 q->q = GMC_send_prebuilt_message (&msg->header, c, fwd, &message_sent, q);
2086 q->cont_cls = cont_cls;
2092 * Is the tunnel directed towards the local peer?
2096 * @return #GNUNET_YES if it is loopback.
2099 GMT_is_loopback (const struct MeshTunnel3 *t)
2101 return (myid == GMP_get_short_id (t->peer));
2106 * Is the tunnel this path already?
2111 * @return #GNUNET_YES a connection uses this path.
2114 GMT_is_path_used (const struct MeshTunnel3 *t, const struct MeshPeerPath *p)
2116 struct MeshTConnection *iter;
2118 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2119 if (GMC_get_path (iter->c) == p)
2127 * Get a cost of a path for a tunnel considering existing connections.
2130 * @param path Candidate path.
2132 * @return Cost of the path (path length + number of overlapping nodes)
2135 GMT_get_path_cost (const struct MeshTunnel3 *t,
2136 const struct MeshPeerPath *path)
2138 struct MeshTConnection *iter;
2139 unsigned int overlap;
2147 GNUNET_assert (NULL != t);
2149 for (i = 0; i < path->length; i++)
2151 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2153 for (j = 0; j < GMC_get_path (iter->c)->length; j++)
2155 if (path->peers[i] == GMC_get_path (iter->c)->peers[j])
2163 return (path->length + overlap) * (path->score * -1);
2168 * Get the static string for the peer this tunnel is directed.
2172 * @return Static string the destination peer's ID.
2175 GMT_2s (const struct MeshTunnel3 *t)
2180 return GMP_2s (t->peer);