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 #define CONNECTIONS_PER_TUNNEL 3
41 /******************************************************************************/
42 /******************************** STRUCTS **********************************/
43 /******************************************************************************/
47 struct MeshTChannel *next;
48 struct MeshTChannel *prev;
49 struct MeshChannel *ch;
54 * Connection list and metadata.
56 struct MeshTConnection
61 struct MeshTConnection *next;
66 struct MeshTConnection *prev;
71 struct MeshConnection *c;
74 * Creation time, to keep oldest connection alive.
76 struct GNUNET_TIME_Absolute created;
79 * Connection throughput, to keep fastest connection alive.
85 * Structure used during a Key eXchange.
87 struct MeshTunnelKXCtx
90 * Decryption ("their") old key, for decrypting traffic sent by the
91 * other end before the key exchange started.
93 struct GNUNET_CRYPTO_SymmetricSessionKey d_key_old;
96 * Challenge to send in a ping and expect in the pong.
102 * Struct containing all information regarding a tunnel to a peer.
107 * Endpoint of the tunnel.
109 struct MeshPeer *peer;
112 * State of the tunnel connectivity.
114 enum MeshTunnel3CState cstate;
117 * State of the tunnel encryption.
119 enum MeshTunnel3EState estate;
122 * Key eXchange context.
124 struct MeshTunnelKXCtx *kx_ctx;
127 * Encryption ("our") key.
129 struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
132 * Decryption ("their") key.
134 struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
137 * Task to start the rekey process.
139 GNUNET_SCHEDULER_TaskIdentifier rekey_task;
142 * Paths that are actively used to reach the destination peer.
144 struct MeshTConnection *connection_head;
145 struct MeshTConnection *connection_tail;
148 * Next connection number.
153 * Channels inside this tunnel.
155 struct MeshTChannel *channel_head;
156 struct MeshTChannel *channel_tail;
159 * Channel ID for the next created channel.
161 MESH_ChannelNumber next_chid;
164 * Destroy flag: if true, destroy on last message.
166 GNUNET_SCHEDULER_TaskIdentifier destroy_task;
169 * Queued messages, to transmit once tunnel gets connected.
171 struct MeshTunnelDelayed *tq_head;
172 struct MeshTunnelDelayed *tq_tail;
177 * Struct used to save messages in a non-ready tunnel to send once connected.
179 struct MeshTunnelDelayed
184 struct MeshTunnelDelayed *next;
185 struct MeshTunnelDelayed *prev;
190 struct MeshTunnel3 *t;
193 * Tunnel queue given to the channel to cancel request. Update on send_queued.
195 struct MeshTunnel3Queue *tq;
200 /* struct GNUNET_MessageHeader *msg; */
205 * Handle for messages queued but not yet sent.
207 struct MeshTunnel3Queue
210 * Connection queue handle, to cancel if necessary.
212 struct MeshConnectionQueue *cq;
215 * Handle in case message hasn't been given to a connection yet.
217 struct MeshTunnelDelayed *tqd;
220 * Continuation to call once sent.
225 * Closure for @c cont.
231 /******************************************************************************/
232 /******************************* GLOBALS ***********************************/
233 /******************************************************************************/
236 * Global handle to the statistics service.
238 extern struct GNUNET_STATISTICS_Handle *stats;
241 * Local peer own ID (memory efficient handle).
243 extern GNUNET_PEER_Id myid;
246 * Local peer own ID (full value).
248 extern struct GNUNET_PeerIdentity my_full_id;
252 * Don't try to recover tunnels if shutting down.
254 extern int shutting_down;
258 * Set of all tunnels, in order to trigger a new exchange on rekey.
259 * Indexed by peer's ID.
261 static struct GNUNET_CONTAINER_MultiPeerMap *tunnels;
264 * Default TTL for payload packets.
266 static unsigned long long default_ttl;
271 const static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
274 * Own ephemeral private key.
276 static struct GNUNET_CRYPTO_EcdhePrivateKey *my_ephemeral_key;
279 * Cached message used to perform a key exchange.
281 static struct GNUNET_MESH_KX_Ephemeral kx_msg;
284 * Task to generate a new ephemeral key.
286 static GNUNET_SCHEDULER_TaskIdentifier rekey_task;
291 static struct GNUNET_TIME_Relative rekey_period;
293 /******************************************************************************/
294 /******************************** STATIC ***********************************/
295 /******************************************************************************/
298 * Get string description for tunnel connectivity state.
300 * @param cs Tunnel state.
302 * @return String representation.
305 cstate2s (enum MeshTunnel3CState cs)
307 static char buf[128];
311 case MESH_TUNNEL3_NEW:
312 return "MESH_TUNNEL3_NEW";
313 case MESH_TUNNEL3_SEARCHING:
314 return "MESH_TUNNEL3_SEARCHING";
315 case MESH_TUNNEL3_WAITING:
316 return "MESH_TUNNEL3_WAITING";
317 case MESH_TUNNEL3_READY:
318 return "MESH_TUNNEL3_READY";
321 sprintf (buf, "%u (UNKNOWN STATE)", cs);
329 * Get string description for tunnel encryption state.
331 * @param es Tunnel state.
333 * @return String representation.
336 estate2s (enum MeshTunnel3EState es)
338 static char buf[128];
342 case MESH_TUNNEL3_KEY_UNINITIALIZED:
343 return "MESH_TUNNEL3_KEY_UNINITIALIZED";
344 case MESH_TUNNEL3_KEY_SENT:
345 return "MESH_TUNNEL3_KEY_SENT";
346 case MESH_TUNNEL3_KEY_PING:
347 return "MESH_TUNNEL3_KEY_PING";
348 case MESH_TUNNEL3_KEY_OK:
349 return "MESH_TUNNEL3_KEY_OK";
352 sprintf (buf, "%u (UNKNOWN STATE)", es);
360 * @brief Check if tunnel is ready to send traffic.
362 * Tunnel must be connected and with encryption correctly set up.
364 * @param t Tunnel to check.
366 * @return #GNUNET_YES if ready, #GNUNET_NO otherwise
369 is_ready (struct MeshTunnel3 *t)
374 ready = (MESH_TUNNEL3_READY == t->cstate && MESH_TUNNEL3_KEY_OK == t->estate);
375 ready = ready || GMT_is_loopback (t);
381 * Ephemeral key message purpose size.
383 * @return Size of the part of the ephemeral key message that must be signed.
386 ephemeral_purpose_size (void)
388 return sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
389 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
390 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
391 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
392 sizeof (struct GNUNET_PeerIdentity);
397 * Size of the encrypted part of a ping message.
399 * @return Size of the encrypted part of a ping message.
402 ping_encryption_size (void)
404 return sizeof (struct GNUNET_PeerIdentity) + sizeof (uint32_t);
409 * Get the channel's buffer. ONLY FOR NON-LOOPBACK CHANNELS!!
411 * @param tch Tunnel's channel handle.
413 * @return Amount of messages the channel can still buffer towards the client.
416 get_channel_buffer (const struct MeshTChannel *tch)
420 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
421 fwd = GMCH_is_origin (tch->ch, GNUNET_YES);
423 return GMCH_get_buffer (tch->ch, fwd);
428 * Get the channel's allowance status.
430 * @param tch Tunnel's channel handle.
432 * @return #GNUNET_YES if we allowed the client to send data to us.
435 get_channel_allowed (const struct MeshTChannel *tch)
439 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
440 fwd = GMCH_is_origin (tch->ch, GNUNET_YES);
442 return GMCH_get_allowed (tch->ch, fwd);
447 * Get the connection's buffer.
449 * @param tc Tunnel's connection handle.
451 * @return Amount of messages the connection can still buffer.
454 get_connection_buffer (const struct MeshTConnection *tc)
458 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
459 fwd = GMC_is_origin (tc->c, GNUNET_YES);
461 return GMC_get_buffer (tc->c, fwd);
466 * Get the connection's allowance.
468 * @param tc Tunnel's connection handle.
470 * @return Amount of messages we have allowed the next peer to send us.
473 get_connection_allowed (const struct MeshTConnection *tc)
477 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
478 fwd = GMC_is_origin (tc->c, GNUNET_YES);
480 return GMC_get_allowed (tc->c, fwd);
485 * Check that a ephemeral key message s well formed and correctly signed.
487 * @param t Tunnel on which the message came.
488 * @param msg The ephemeral key message.
490 * @return GNUNET_OK if message is fine, GNUNET_SYSERR otherwise.
493 check_ephemeral (struct MeshTunnel3 *t,
494 const struct GNUNET_MESH_KX_Ephemeral *msg)
496 /* Check message size */
497 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_KX_Ephemeral))
498 return GNUNET_SYSERR;
500 /* Check signature size */
501 if (ntohl (msg->purpose.size) != ephemeral_purpose_size ())
502 return GNUNET_SYSERR;
505 if (0 != memcmp (&msg->origin_identity,
506 GMP_get_id (t->peer),
507 sizeof (struct GNUNET_PeerIdentity)))
508 return GNUNET_SYSERR;
510 /* Check signature */
512 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_MESH_KX,
515 &msg->origin_identity.public_key))
516 return GNUNET_SYSERR;
523 * Encrypt data with the tunnel key.
525 * @param t Tunnel whose key to use.
526 * @param dst Destination for the encrypted data.
527 * @param src Source of the plaintext. Can overlap with @c dst.
528 * @param size Size of the plaintext.
529 * @param iv Initialization Vector to use.
532 t_encrypt (struct MeshTunnel3 *t,
533 void *dst, const void *src,
534 size_t size, uint32_t iv)
536 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
539 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt start\n");
540 GNUNET_CRYPTO_symmetric_derive_iv (&siv, &t->e_key, &iv, sizeof (iv), NULL);
541 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt IV derived\n");
542 out_size = GNUNET_CRYPTO_symmetric_encrypt (src, size, &t->e_key, &siv, dst);
543 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt end\n");
550 * Decrypt data with the tunnel key.
552 * @param t Tunnel whose key to use.
553 * @param dst Destination for the plaintext.
554 * @param src Source of the encrypted data. Can overlap with @c dst.
555 * @param size Size of the encrypted data.
556 * @param iv Initialization Vector to use.
559 t_decrypt (struct MeshTunnel3 *t,
560 void *dst, const void *src,
561 size_t size, uint32_t iv)
563 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
564 struct GNUNET_CRYPTO_SymmetricSessionKey *key;
567 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt start\n");
568 if (t->estate == MESH_TUNNEL3_KEY_OK || t->estate == MESH_TUNNEL3_KEY_PING)
572 else if (NULL != t->kx_ctx)
574 key = &t->kx_ctx->d_key_old;
578 GNUNET_STATISTICS_update (stats, "# non decryptable data", 1, GNUNET_NO);
579 LOG (GNUNET_ERROR_TYPE_DEBUG,
580 "WARNING got data on %s without a valid key\n",
586 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt iv\n");
587 GNUNET_CRYPTO_symmetric_derive_iv (&siv, key, &iv, sizeof (iv), NULL);
588 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt iv done\n");
589 out_size = GNUNET_CRYPTO_symmetric_decrypt (src, size, key, &siv, dst);
590 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt end\n");
597 * Create key material by doing ECDH on the local and remote ephemeral keys.
599 * @param key_material Where to store the key material.
600 * @param ephemeral_key Peer's public ephemeral key.
603 derive_key_material (struct GNUNET_HashCode *key_material,
604 const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key)
607 GNUNET_CRYPTO_ecc_ecdh (my_ephemeral_key,
616 * Create a symmetic key from the identities of both ends and the key material
619 * @param key Destination for the generated key.
620 * @param sender ID of the peer that will encrypt with @c key.
621 * @param receiver ID of the peer that will decrypt with @c key.
622 * @param key_material Hash created with ECDH with the ephemeral keys.
625 derive_symmertic (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
626 const struct GNUNET_PeerIdentity *sender,
627 const struct GNUNET_PeerIdentity *receiver,
628 const struct GNUNET_HashCode *key_material)
630 const char salt[] = "MESH kx salt";
632 GNUNET_CRYPTO_kdf (key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
634 key_material, sizeof (struct GNUNET_HashCode),
635 sender, sizeof (struct GNUNET_PeerIdentity),
636 receiver, sizeof (struct GNUNET_PeerIdentity),
641 * Pick a connection on which send the next data message.
643 * @param t Tunnel on which to send the message.
645 * @return The connection on which to send the next message.
647 static struct MeshConnection *
648 tunnel_get_connection (struct MeshTunnel3 *t)
650 struct MeshTConnection *iter;
651 struct MeshConnection *best;
653 unsigned int lowest_q;
655 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GMT_2s (t));
658 for (iter = t->connection_head; NULL != iter; iter = iter->next)
660 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
661 GMC_2s (iter->c), GMC_get_state (iter->c));
662 if (MESH_CONNECTION_READY == GMC_get_state (iter->c))
664 qn = GMC_get_qn (iter->c, GMC_is_origin (iter->c, GNUNET_YES));
665 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
673 LOG (GNUNET_ERROR_TYPE_DEBUG, " selected: connection %s\n", GMC_2s (best));
679 * Callback called when a queued message is sent.
681 * Calculates the average time and connection packet tracking.
683 * @param cls Closure (TunnelQueue handle).
684 * @param c Connection this message was on.
685 * @param q Connection queue handle (unused).
686 * @param type Type of message sent.
687 * @param fwd Was this a FWD going message?
688 * @param size Size of the message.
691 tun_message_sent (void *cls,
692 struct MeshConnection *c,
693 struct MeshConnectionQueue *q,
694 uint16_t type, int fwd, size_t size)
696 struct MeshTunnel3Queue *qt = cls;
698 LOG (GNUNET_ERROR_TYPE_DEBUG, "tun_message_sent\n");
700 GNUNET_assert (NULL != qt->cont);
701 qt->cont (qt->cont_cls, GMC_get_tunnel (c), qt, type, size);
707 * Delete a queued message: either was sent or the channel was destroyed
708 * before the tunnel's key exchange had a chance to finish.
710 * @param tqd Delayed queue handle.
713 unqueue_data (struct MeshTunnelDelayed *tqd)
715 GNUNET_CONTAINER_DLL_remove (tqd->t->tq_head, tqd->t->tq_tail, tqd);
721 * Cache a message to be sent once tunnel is online.
723 * @param t Tunnel to hold the message.
724 * @param msg Message itself (copy will be made).
726 static struct MeshTunnelDelayed *
727 queue_data (struct MeshTunnel3 *t, const struct GNUNET_MessageHeader *msg)
729 struct MeshTunnelDelayed *tqd;
730 uint16_t size = ntohs (msg->size);
732 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue data on Tunnel %s\n", GMT_2s (t));
734 if (GNUNET_YES == is_ready (t))
740 tqd = GNUNET_malloc (sizeof (struct MeshTunnelDelayed) + size);
743 memcpy (&tqd[1], msg, size);
744 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tqd);
752 * @param t Tunnel to get keys from.
753 * @param plaintext Content to HMAC.
754 * @param size Size of @c plaintext.
755 * @param iv Initialization vector for the message.
756 * @param outgoing Is this an outgoing message that we encrypted?
757 * @param hmac Destination to store the HMAC.
760 t_hmac (struct MeshTunnel3 *t, const void *plaintext, size_t size, uint32_t iv,
761 int outgoing, struct GNUNET_MESH_Hash *hmac)
763 struct GNUNET_CRYPTO_AuthKey auth_key;
764 static const char ctx[] = "mesh authentication key";
765 struct GNUNET_CRYPTO_SymmetricSessionKey *key;
766 struct GNUNET_HashCode hash;
768 key = outgoing ? &t->e_key : &t->d_key;
769 GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
774 GNUNET_CRYPTO_hmac (&auth_key, plaintext, size, &hash);
775 memcpy (hmac, &hash, sizeof (*hmac));
780 * Sends an already built message on a tunnel, encrypting it and
781 * choosing the best connection.
783 * @param message Message to send. Function modifies it.
784 * @param t Tunnel on which this message is transmitted.
785 * @param c Connection to use (autoselect if NULL).
786 * @param force Force the tunnel to take the message (buffer overfill).
787 * @param cont Continuation to call once message is really sent.
788 * @param cont_cls Closure for @c cont.
789 * @param existing_q In case this a transmission of previously queued data,
790 * this should be TunnelQueue given to the client.
793 * @return Handle to cancel message. NULL if @c cont is NULL.
795 static struct MeshTunnel3Queue *
796 send_prebuilt_message (const struct GNUNET_MessageHeader *message,
797 struct MeshTunnel3 *t, struct MeshConnection *c,
798 int force, GMT_sent cont, void *cont_cls,
799 struct MeshTunnel3Queue *existing_q)
801 struct MeshTunnel3Queue *tq;
802 struct GNUNET_MESH_Encrypted *msg;
803 size_t size = ntohs (message->size);
804 char cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
809 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GMT_2s (t));
811 if (GNUNET_NO == is_ready (t))
813 struct MeshTunnelDelayed *tqd;
814 /* A non null existing_q indicates sending of queued data.
815 * Should only happen after tunnel becomes ready.
817 GNUNET_assert (NULL == existing_q);
818 tqd = queue_data (t, message);
821 tq = GNUNET_new (struct MeshTunnel3Queue);
825 tq->cont_cls = cont_cls;
829 GNUNET_assert (GNUNET_NO == GMT_is_loopback (t));
831 iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
832 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
833 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED);
835 GNUNET_assert (t_encrypt (t, &msg[1], message, size, iv) == size);
836 t_hmac (t, &msg[1], size, iv, GNUNET_YES, &msg->hmac);
837 msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size);
840 c = tunnel_get_connection (t);
843 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task
844 || MESH_TUNNEL3_SEARCHING != t->cstate)
852 type = ntohs (message->type);
855 case GNUNET_MESSAGE_TYPE_MESH_KEEPALIVE:
856 case GNUNET_MESSAGE_TYPE_MESH_DATA:
857 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
858 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
859 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
860 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
861 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK:
862 msg->cid = *GMC_get_id (c);
863 msg->ttl = htonl (default_ttl);
866 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
871 fwd = GMC_is_origin (c, GNUNET_YES);
875 (void) GMC_send_prebuilt_message (&msg->header, c, fwd, force, NULL, NULL);
878 if (NULL == existing_q)
880 tq = GNUNET_new (struct MeshTunnel3Queue); /* FIXME valgrind: leak*/
887 tq->cq = GMC_send_prebuilt_message (&msg->header, c, fwd, force,
888 &tun_message_sent, tq);
890 tq->cont_cls = cont_cls;
897 * Send all cached messages that we can, tunnel is online.
899 * @param t Tunnel that holds the messages. Cannot be loopback.
902 send_queued_data (struct MeshTunnel3 *t)
904 struct MeshTunnelDelayed *tqd;
905 struct MeshTunnelDelayed *next;
908 LOG (GNUNET_ERROR_TYPE_DEBUG,
909 "GMT_send_queued_data on tunnel %s\n",
912 if (GMT_is_loopback (t))
918 if (GNUNET_NO == is_ready (t))
920 LOG (GNUNET_ERROR_TYPE_DEBUG, " not ready yet: %s/%s\n",
921 estate2s (t->estate), cstate2s (t->cstate));
925 room = GMT_get_connections_buffer (t);
926 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
927 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq head: %p\n", t->tq_head);
928 for (tqd = t->tq_head; NULL != tqd && room > 0; tqd = next)
930 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending queued data\n");
933 send_prebuilt_message ((struct GNUNET_MessageHeader *) &tqd[1],
934 tqd->t, NULL, GNUNET_YES,
935 NULL != tqd->tq ? tqd->tq->cont : NULL,
936 NULL != tqd->tq ? tqd->tq->cont_cls : NULL,
940 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_send_queued_data end\n", GMP_2s (t->peer));
945 * Sends key exchange message on a tunnel, choosing the best connection.
946 * Should not be called on loopback tunnels.
948 * @param t Tunnel on which this message is transmitted.
949 * @param message Message to send. Function modifies it.
952 send_kx (struct MeshTunnel3 *t,
953 const struct GNUNET_MessageHeader *message)
955 struct MeshConnection *c;
956 struct GNUNET_MESH_KX *msg;
957 size_t size = ntohs (message->size);
958 char cbuf[sizeof (struct GNUNET_MESH_KX) + size];
962 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT KX on Tunnel %s\n", GMT_2s (t));
964 /* Avoid loopback. */
965 if (GMT_is_loopback (t))
967 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback!\n");
972 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task)
974 LOG (GNUNET_ERROR_TYPE_DEBUG, " being destroyed, why bother\n");
978 /* Must have a connection. */
979 if (NULL == t->connection_head)
981 GNUNET_break (MESH_TUNNEL3_SEARCHING == t->cstate);
986 msg = (struct GNUNET_MESH_KX *) cbuf;
987 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX);
988 msg->header.size = htons (sizeof (struct GNUNET_MESH_KX) + size);
989 c = tunnel_get_connection (t);
992 GNUNET_break (GNUNET_SCHEDULER_NO_TASK != t->destroy_task
993 || MESH_TUNNEL3_READY != t->cstate);
997 type = ntohs (message->type);
1000 case GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL:
1001 case GNUNET_MESSAGE_TYPE_MESH_KX_PING:
1002 case GNUNET_MESSAGE_TYPE_MESH_KX_PONG:
1003 memcpy (&msg[1], message, size);
1006 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
1011 fwd = GMC_is_origin (t->connection_head->c, GNUNET_YES);
1012 /* TODO save handle and cancel in case of a unneeded retransmission */
1013 GMC_send_prebuilt_message (&msg->header, c, fwd, GNUNET_YES, NULL, NULL);
1018 * Send the ephemeral key on a tunnel.
1020 * @param t Tunnel on which to send the key.
1023 send_ephemeral (struct MeshTunnel3 *t)
1025 LOG (GNUNET_ERROR_TYPE_INFO, "=> EPHM for %s\n", GMT_2s (t));
1027 kx_msg.sender_status = htonl (t->estate);
1028 send_kx (t, &kx_msg.header);
1032 * Send a ping message on a tunnel.
1034 * @param t Tunnel on which to send the ping.
1037 send_ping (struct MeshTunnel3 *t)
1039 struct GNUNET_MESH_KX_Ping msg;
1041 LOG (GNUNET_ERROR_TYPE_INFO, "=> PING for %s\n", GMT_2s (t));
1042 msg.header.size = htons (sizeof (msg));
1043 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_PING);
1044 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1045 msg.target = *GMP_get_id (t->peer);
1046 msg.nonce = t->kx_ctx->challenge;
1048 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
1049 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&msg.target));
1050 t_encrypt (t, &msg.target, &msg.target, ping_encryption_size(), msg.iv);
1051 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
1052 LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg.target));
1054 send_kx (t, &msg.header);
1059 * Send a pong message on a tunnel.
1061 * @param t Tunnel on which to send the pong.
1062 * @param challenge Value sent in the ping that we have to send back.
1065 send_pong (struct MeshTunnel3 *t, uint32_t challenge)
1067 struct GNUNET_MESH_KX_Pong msg;
1069 LOG (GNUNET_ERROR_TYPE_INFO, "=> PONG for %s\n", GMT_2s (t));
1070 msg.header.size = htons (sizeof (msg));
1071 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_PONG);
1072 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1073 msg.nonce = challenge;
1074 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
1075 t_encrypt (t, &msg.nonce, &msg.nonce, sizeof (msg.nonce), msg.iv);
1076 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
1078 send_kx (t, &msg.header);
1083 * Initiate a rekey with the remote peer.
1085 * @param cls Closure (tunnel).
1086 * @param tc TaskContext.
1089 rekey_tunnel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1091 struct MeshTunnel3 *t = cls;
1093 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
1095 LOG (GNUNET_ERROR_TYPE_DEBUG, "Re-key Tunnel %s\n", GMT_2s (t));
1096 if (NULL != tc && 0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1099 if (NULL == t->kx_ctx)
1101 LOG (GNUNET_ERROR_TYPE_DEBUG, " new kx ctx\n");
1102 t->kx_ctx = GNUNET_new (struct MeshTunnelKXCtx);
1103 t->kx_ctx->challenge =
1104 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1105 t->kx_ctx->d_key_old = t->d_key;
1106 LOG (GNUNET_ERROR_TYPE_DEBUG, " new challenge for %s: %u\n",
1107 GMT_2s (t), t->kx_ctx->challenge);
1112 case MESH_TUNNEL3_KEY_UNINITIALIZED:
1113 t->estate = MESH_TUNNEL3_KEY_SENT;
1115 case MESH_TUNNEL3_KEY_SENT:
1117 case MESH_TUNNEL3_KEY_PING:
1118 case MESH_TUNNEL3_KEY_OK:
1120 t->estate = MESH_TUNNEL3_KEY_PING;
1123 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unexpected state %u\n", t->estate);
1126 LOG (GNUNET_ERROR_TYPE_DEBUG, " next call in %s\n",
1127 GNUNET_STRINGS_relative_time_to_string (REKEY_WAIT, GNUNET_YES));
1128 t->rekey_task = GNUNET_SCHEDULER_add_delayed (REKEY_WAIT, &rekey_tunnel, t);
1133 * Out ephemeral key has changed, create new session key on all tunnels.
1135 * @param cls Closure (size of the hashmap).
1136 * @param key Current public key.
1137 * @param value Value in the hash map (tunnel).
1139 * @return #GNUNET_YES, so we should continue to iterate,
1142 rekey_iterator (void *cls,
1143 const struct GNUNET_PeerIdentity *key,
1146 struct MeshTunnel3 *t = value;
1147 struct GNUNET_TIME_Relative delay;
1148 long n = (long) cls;
1151 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
1154 if (GNUNET_YES == GMT_is_loopback (t))
1157 r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, (uint32_t) n * 100);
1158 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, r);
1159 t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
1166 * Create a new ephemeral key and key message, schedule next rekeying.
1168 * @param cls Closure (unused).
1169 * @param tc TaskContext.
1172 rekey (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1174 struct GNUNET_TIME_Absolute time;
1177 rekey_task = GNUNET_SCHEDULER_NO_TASK;
1179 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1182 GNUNET_free_non_null (my_ephemeral_key);
1183 my_ephemeral_key = GNUNET_CRYPTO_ecdhe_key_create ();
1185 time = GNUNET_TIME_absolute_get ();
1186 kx_msg.creation_time = GNUNET_TIME_absolute_hton (time);
1187 time = GNUNET_TIME_absolute_add (time, rekey_period);
1188 time = GNUNET_TIME_absolute_add (time, GNUNET_TIME_UNIT_MINUTES);
1189 kx_msg.expiration_time = GNUNET_TIME_absolute_hton (time);
1190 GNUNET_CRYPTO_ecdhe_key_get_public (my_ephemeral_key, &kx_msg.ephemeral_key);
1192 GNUNET_assert (GNUNET_OK ==
1193 GNUNET_CRYPTO_eddsa_sign (my_private_key,
1195 &kx_msg.signature));
1197 n = (long) GNUNET_CONTAINER_multipeermap_size (tunnels);
1198 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &rekey_iterator, (void *) n);
1200 rekey_task = GNUNET_SCHEDULER_add_delayed (rekey_period, &rekey, NULL);
1205 * Called only on shutdown, destroy every tunnel.
1207 * @param cls Closure (unused).
1208 * @param key Current public key.
1209 * @param value Value in the hash map (tunnel).
1211 * @return #GNUNET_YES, so we should continue to iterate,
1214 destroy_iterator (void *cls,
1215 const struct GNUNET_PeerIdentity *key,
1218 struct MeshTunnel3 *t = value;
1226 * Notify remote peer that we don't know a channel he is talking about,
1227 * probably CHANNEL_DESTROY was missed.
1229 * @param t Tunnel on which to notify.
1230 * @param gid ID of the channel.
1233 send_channel_destroy (struct MeshTunnel3 *t, unsigned int gid)
1235 struct GNUNET_MESH_ChannelManage msg;
1237 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
1238 msg.header.size = htons (sizeof (msg));
1239 msg.chid = htonl (gid);
1241 LOG (GNUNET_ERROR_TYPE_DEBUG,
1242 "WARNING destroying unknown channel %u on tunnel %s\n",
1244 send_prebuilt_message (&msg.header, t, NULL, GNUNET_YES, NULL, NULL, NULL);
1249 * Demultiplex data per channel and call appropriate channel handler.
1251 * @param t Tunnel on which the data came.
1252 * @param msg Data message.
1253 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1254 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1255 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1256 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1259 handle_data (struct MeshTunnel3 *t,
1260 const struct GNUNET_MESH_Data *msg,
1263 struct MeshChannel *ch;
1267 size = ntohs (msg->header.size);
1269 sizeof (struct GNUNET_MESH_Data) +
1270 sizeof (struct GNUNET_MessageHeader))
1275 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
1276 GM_m2s (ntohs (msg[1].header.type)));
1279 ch = GMT_get_channel (t, ntohl (msg->chid));
1282 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
1284 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel 0x%X unknown\n",
1286 send_channel_destroy (t, ntohl (msg->chid));
1290 GMCH_handle_data (ch, msg, fwd);
1295 * Demultiplex data ACKs per channel and update appropriate channel buffer info.
1297 * @param t Tunnel on which the DATA ACK came.
1298 * @param msg DATA ACK message.
1299 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1300 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1301 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1302 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1305 handle_data_ack (struct MeshTunnel3 *t,
1306 const struct GNUNET_MESH_DataACK *msg,
1309 struct MeshChannel *ch;
1313 size = ntohs (msg->header.size);
1314 if (size != sizeof (struct GNUNET_MESH_DataACK))
1321 ch = GMT_get_channel (t, ntohl (msg->chid));
1324 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
1326 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1331 GMCH_handle_data_ack (ch, msg, fwd);
1336 * Handle channel create.
1338 * @param t Tunnel on which the data came.
1339 * @param msg Data message.
1342 handle_ch_create (struct MeshTunnel3 *t,
1343 const struct GNUNET_MESH_ChannelCreate *msg)
1345 struct MeshChannel *ch;
1349 size = ntohs (msg->header.size);
1350 if (size != sizeof (struct GNUNET_MESH_ChannelCreate))
1357 ch = GMT_get_channel (t, ntohl (msg->chid));
1358 if (NULL != ch && ! GMT_is_loopback (t))
1360 /* Probably a retransmission, safe to ignore */
1361 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
1363 ch = GMCH_handle_create (t, msg);
1365 GMT_add_channel (t, ch);
1371 * Handle channel NACK: check correctness and call channel handler for NACKs.
1373 * @param t Tunnel on which the NACK came.
1374 * @param msg NACK message.
1377 handle_ch_nack (struct MeshTunnel3 *t,
1378 const struct GNUNET_MESH_ChannelManage *msg)
1380 struct MeshChannel *ch;
1384 size = ntohs (msg->header.size);
1385 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1392 ch = GMT_get_channel (t, ntohl (msg->chid));
1395 GNUNET_STATISTICS_update (stats, "# channel NACK on unknown channel",
1397 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1402 GMCH_handle_nack (ch);
1407 * Handle a CHANNEL ACK (SYNACK/ACK).
1409 * @param t Tunnel on which the CHANNEL ACK came.
1410 * @param msg CHANNEL ACK message.
1411 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1412 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1413 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1414 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1417 handle_ch_ack (struct MeshTunnel3 *t,
1418 const struct GNUNET_MESH_ChannelManage *msg,
1421 struct MeshChannel *ch;
1425 size = ntohs (msg->header.size);
1426 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1433 ch = GMT_get_channel (t, ntohl (msg->chid));
1436 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
1438 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1443 GMCH_handle_ack (ch, msg, fwd);
1449 * Handle a channel destruction message.
1451 * @param t Tunnel on which the message came.
1452 * @param msg Channel destroy message.
1453 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1454 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1455 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1456 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1459 handle_ch_destroy (struct MeshTunnel3 *t,
1460 const struct GNUNET_MESH_ChannelManage *msg,
1463 struct MeshChannel *ch;
1467 size = ntohs (msg->header.size);
1468 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1475 ch = GMT_get_channel (t, ntohl (msg->chid));
1478 /* Probably a retransmission, safe to ignore */
1482 GMCH_handle_destroy (ch, msg, fwd);
1487 * The peer's ephemeral key has changed: update the symmetrical keys.
1489 * @param t Tunnel this message came on.
1490 * @param msg Key eXchange message.
1493 handle_ephemeral (struct MeshTunnel3 *t,
1494 const struct GNUNET_MESH_KX_Ephemeral *msg)
1496 struct GNUNET_HashCode km;
1497 LOG (GNUNET_ERROR_TYPE_INFO, "<= EPHM for %s\n", GMT_2s (t));
1499 if (GNUNET_OK != check_ephemeral (t, msg))
1501 GNUNET_break_op (0);
1504 derive_key_material (&km, &msg->ephemeral_key);
1505 LOG (GNUNET_ERROR_TYPE_DEBUG, " km is %s\n", GNUNET_h2s (&km));
1506 derive_symmertic (&t->e_key, &my_full_id, GMP_get_id (t->peer), &km);
1507 derive_symmertic (&t->d_key, GMP_get_id (t->peer), &my_full_id, &km);
1508 if (MESH_TUNNEL3_KEY_SENT == t->estate)
1510 LOG (GNUNET_ERROR_TYPE_DEBUG, " our key was sent, send ping\n");
1512 t->estate = MESH_TUNNEL3_KEY_PING;
1518 * Peer wants to check our symmetrical keys by sending an encrypted challenge.
1519 * Answer with by retransmitting the challenge with the "opposite" key.
1521 * @param t Tunnel this message came on.
1522 * @param msg Key eXchange Ping message.
1525 handle_ping (struct MeshTunnel3 *t,
1526 const struct GNUNET_MESH_KX_Ping *msg)
1528 struct GNUNET_MESH_KX_Ping res;
1530 if (ntohs (msg->header.size) != sizeof (res))
1532 GNUNET_break_op (0);
1536 LOG (GNUNET_ERROR_TYPE_INFO, "<= PING for %s\n", GMT_2s (t));
1537 t_decrypt (t, &res.target, &msg->target, ping_encryption_size (), msg->iv);
1538 if (0 != memcmp (&my_full_id, &res.target, sizeof (my_full_id)))
1540 GNUNET_STATISTICS_update (stats, "# malformed PINGs", 1, GNUNET_NO);
1541 LOG (GNUNET_ERROR_TYPE_WARNING, " malformed PING\n");
1542 LOG (GNUNET_ERROR_TYPE_DEBUG, " e got %u\n", msg->nonce);
1543 LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg->target));
1544 LOG (GNUNET_ERROR_TYPE_DEBUG, " got %u\n", res.nonce);
1545 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&res.target));
1549 send_pong (t, res.nonce);
1554 * Peer has answer to our challenge.
1555 * If answer is successful, consider the key exchange finished and clean
1556 * up all related state.
1558 * @param t Tunnel this message came on.
1559 * @param msg Key eXchange Pong message.
1562 handle_pong (struct MeshTunnel3 *t,
1563 const struct GNUNET_MESH_KX_Pong *msg)
1567 LOG (GNUNET_ERROR_TYPE_INFO, "<= PONG for %s\n", GMT_2s (t));
1568 if (GNUNET_SCHEDULER_NO_TASK == t->rekey_task)
1570 GNUNET_STATISTICS_update (stats, "# duplicate PONG messages", 1, GNUNET_NO);
1573 t_decrypt (t, &challenge, &msg->nonce, sizeof (uint32_t), msg->iv);
1575 if (challenge != t->kx_ctx->challenge)
1577 LOG (GNUNET_ERROR_TYPE_WARNING, "Wrong PONG challenge\n");
1578 LOG (GNUNET_ERROR_TYPE_DEBUG, "PONG: %u (e: %u). Expected: %u.\n",
1579 challenge, msg->nonce, t->kx_ctx->challenge);
1580 GNUNET_break_op (0);
1583 GNUNET_SCHEDULER_cancel (t->rekey_task);
1584 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
1585 GNUNET_free (t->kx_ctx);
1587 GMT_change_estate (t, MESH_TUNNEL3_KEY_OK);
1592 * Demultiplex by message type and call appropriate handler for a message
1593 * towards a channel of a local tunnel.
1595 * @param t Tunnel this message came on.
1596 * @param msgh Message header.
1597 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1598 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1599 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1600 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1603 handle_decrypted (struct MeshTunnel3 *t,
1604 const struct GNUNET_MessageHeader *msgh,
1609 type = ntohs (msgh->type);
1610 LOG (GNUNET_ERROR_TYPE_INFO, "<= %s on %s\n", GM_m2s (type), GMT_2s (t));
1614 case GNUNET_MESSAGE_TYPE_MESH_KEEPALIVE:
1615 /* Do nothing, connection aleady got updated. */
1616 GNUNET_STATISTICS_update (stats, "# keepalives received", 1, GNUNET_NO);
1619 case GNUNET_MESSAGE_TYPE_MESH_DATA:
1620 /* Don't send hop ACK, wait for client to ACK */
1621 handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
1624 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
1625 handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
1628 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1629 handle_ch_create (t,
1630 (struct GNUNET_MESH_ChannelCreate *) msgh);
1633 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK:
1635 (struct GNUNET_MESH_ChannelManage *) msgh);
1638 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
1640 (struct GNUNET_MESH_ChannelManage *) msgh,
1644 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1645 handle_ch_destroy (t,
1646 (struct GNUNET_MESH_ChannelManage *) msgh,
1651 GNUNET_break_op (0);
1652 LOG (GNUNET_ERROR_TYPE_WARNING,
1653 "end-to-end message not known (%u)\n",
1654 ntohs (msgh->type));
1659 /******************************************************************************/
1660 /******************************** API ***********************************/
1661 /******************************************************************************/
1664 * Decrypt and demultiplex by message type. Call appropriate handler
1665 * for every message.
1667 * @param t Tunnel this message came on.
1668 * @param msg Encrypted message.
1671 GMT_handle_encrypted (struct MeshTunnel3 *t,
1672 const struct GNUNET_MESH_Encrypted *msg)
1674 size_t size = ntohs (msg->header.size);
1675 size_t payload_size = size - sizeof (struct GNUNET_MESH_Encrypted);
1676 size_t decrypted_size;
1677 char cbuf [payload_size];
1678 struct GNUNET_MessageHeader *msgh;
1680 struct GNUNET_MESH_Hash hmac;
1682 decrypted_size = t_decrypt (t, cbuf, &msg[1], payload_size, msg->iv);
1683 t_hmac (t, &msg[1], payload_size, msg->iv, GNUNET_NO, &hmac);
1684 if (0 != memcmp (&hmac, &msg->hmac, sizeof (hmac)))
1686 /* checksum failed */
1687 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1688 "Failed checksum validation for a message on tunnel `%s'\n",
1690 GNUNET_STATISTICS_update (stats, "# wrong HMAC", 1, GNUNET_NO);
1694 while (off < decrypted_size)
1696 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
1697 handle_decrypted (t, msgh, GNUNET_SYSERR);
1698 off += ntohs (msgh->size);
1704 * Demultiplex an encapsulated KX message by message type.
1706 * @param t Tunnel on which the message came.
1707 * @param message Payload of KX message.
1710 GMT_handle_kx (struct MeshTunnel3 *t,
1711 const struct GNUNET_MessageHeader *message)
1715 type = ntohs (message->type);
1716 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message received\n", type);
1719 case GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL:
1720 handle_ephemeral (t, (struct GNUNET_MESH_KX_Ephemeral *) message);
1723 case GNUNET_MESSAGE_TYPE_MESH_KX_PING:
1724 handle_ping (t, (struct GNUNET_MESH_KX_Ping *) message);
1727 case GNUNET_MESSAGE_TYPE_MESH_KX_PONG:
1728 handle_pong (t, (struct GNUNET_MESH_KX_Pong *) message);
1732 GNUNET_break_op (0);
1733 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message not known (%u)\n", type);
1739 * Initialize the tunnel subsystem.
1741 * @param c Configuration handle.
1742 * @param key ECC private key, to derive all other keys and do crypto.
1745 GMT_init (const struct GNUNET_CONFIGURATION_Handle *c,
1746 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
1748 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
1750 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
1753 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1754 "MESH", "DEFAULT_TTL", "USING DEFAULT");
1758 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REKEY_PERIOD",
1761 rekey_period = GNUNET_TIME_UNIT_DAYS;
1764 my_private_key = key;
1765 kx_msg.header.size = htons (sizeof (kx_msg));
1766 kx_msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL);
1767 kx_msg.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_MESH_KX);
1768 kx_msg.purpose.size = htonl (ephemeral_purpose_size ());
1769 kx_msg.origin_identity = my_full_id;
1770 rekey_task = GNUNET_SCHEDULER_add_now (&rekey, NULL);
1772 tunnels = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1777 * Shut down the tunnel subsystem.
1782 if (GNUNET_SCHEDULER_NO_TASK != rekey_task)
1784 GNUNET_SCHEDULER_cancel (rekey_task);
1785 rekey_task = GNUNET_SCHEDULER_NO_TASK;
1787 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &destroy_iterator, NULL);
1788 GNUNET_CONTAINER_multipeermap_destroy (tunnels);
1795 * @param destination Peer this tunnel is towards.
1797 struct MeshTunnel3 *
1798 GMT_new (struct MeshPeer *destination)
1800 struct MeshTunnel3 *t;
1802 t = GNUNET_new (struct MeshTunnel3);
1804 t->peer = destination;
1807 GNUNET_CONTAINER_multipeermap_put (tunnels, GMP_get_id (destination), t,
1808 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1819 * Change the tunnel's connection state.
1821 * @param t Tunnel whose connection state to change.
1822 * @param cstate New connection state.
1825 GMT_change_cstate (struct MeshTunnel3* t, enum MeshTunnel3CState cstate)
1829 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s cstate %s => %s\n",
1830 GMP_2s (t->peer), cstate2s (t->cstate), cstate2s (cstate));
1831 if (myid != GMP_get_short_id (t->peer) &&
1832 MESH_TUNNEL3_READY != t->cstate &&
1833 MESH_TUNNEL3_READY == cstate)
1836 if (MESH_TUNNEL3_KEY_OK == t->estate)
1838 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered send queued data\n");
1839 send_queued_data (t);
1841 else if (MESH_TUNNEL3_KEY_UNINITIALIZED == t->estate)
1843 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered rekey\n");
1844 rekey_tunnel (t, NULL);
1849 if (MESH_TUNNEL3_READY == cstate
1850 && CONNECTIONS_PER_TUNNEL <= GMT_count_connections (t))
1852 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered stop dht\n");
1853 GMP_stop_search (t->peer);
1858 * Change the tunnel encryption state.
1860 * @param t Tunnel whose encryption state to change.
1861 * @param state New encryption state.
1864 GMT_change_estate (struct MeshTunnel3* t, enum MeshTunnel3EState state)
1868 LOG (GNUNET_ERROR_TYPE_DEBUG,
1869 "Tunnel %s estate was %s\n",
1870 GMP_2s (t->peer), estate2s (t->estate));
1871 LOG (GNUNET_ERROR_TYPE_DEBUG,
1872 "Tunnel %s estate is now %s\n",
1873 GMP_2s (t->peer), estate2s (state));
1874 if (myid != GMP_get_short_id (t->peer) &&
1875 MESH_TUNNEL3_KEY_OK != t->estate && MESH_TUNNEL3_KEY_OK == state)
1878 send_queued_data (t);
1886 * Check that the tunnel doesn't have too many connections,
1887 * remove one if necessary.
1889 * For the time being, this means the newest connection.
1891 * @param t Tunnel to check.
1894 check_connection_count (struct MeshTunnel3 *t)
1896 if (GMT_count_connections (t) > CONNECTIONS_PER_TUNNEL)
1898 struct MeshTConnection *iter;
1899 struct MeshTConnection *c;
1901 for (c = iter = t->connection_head; NULL != iter; iter = iter->next)
1903 if (NULL == c || iter->created.abs_value_us > c->created.abs_value_us)
1916 * Add a connection to a tunnel.
1919 * @param c Connection.
1922 GMT_add_connection (struct MeshTunnel3 *t, struct MeshConnection *c)
1924 struct MeshTConnection *aux;
1926 GNUNET_assert (NULL != c);
1928 for (aux = t->connection_head; aux != NULL; aux = aux->next)
1932 aux = GNUNET_new (struct MeshTConnection);
1934 aux->created = GNUNET_TIME_absolute_get ();
1936 GNUNET_CONTAINER_DLL_insert (t->connection_head, t->connection_tail, aux);
1938 check_connection_count (t);
1943 * Mark a path as no longer valid for this tunnel: has been tried and failed.
1945 * @param t Tunnel to update.
1946 * @param path Invalid path to remove. Is destroyed after removal.
1949 GMT_remove_path (struct MeshTunnel3 *t, struct MeshPeerPath *path)
1951 GMP_remove_path (t->peer, path);
1956 * Remove a connection from a tunnel.
1959 * @param c Connection.
1962 GMT_remove_connection (struct MeshTunnel3 *t,
1963 struct MeshConnection *c)
1965 struct MeshTConnection *aux;
1966 struct MeshTConnection *next;
1968 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing connection %s from tunnel %s\n",
1969 GMC_2s (c), GMT_2s (t));
1970 for (aux = t->connection_head; aux != NULL; aux = next)
1975 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
1980 /* Start new connections if needed */
1981 if (NULL == t->connection_head
1982 && GNUNET_SCHEDULER_NO_TASK == t->destroy_task
1983 && MESH_TUNNEL3_SHUTDOWN != t->cstate
1984 && GNUNET_NO == shutting_down)
1986 LOG (GNUNET_ERROR_TYPE_DEBUG, " no more connections, getting new ones\n");
1987 t->cstate = MESH_TUNNEL3_SEARCHING;
1988 GMP_connect (t->peer);
1992 /* If not marked as ready, no change is needed */
1993 if (MESH_TUNNEL3_READY != t->cstate)
1996 /* Check if any connection is ready to maintaing cstate */
1997 for (aux = t->connection_head; aux != NULL; aux = aux->next)
1998 if (MESH_CONNECTION_READY == GMC_get_state (aux->c))
2001 t->cstate = MESH_TUNNEL3_WAITING;
2006 * Add a channel to a tunnel.
2009 * @param ch Channel.
2012 GMT_add_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
2014 struct MeshTChannel *aux;
2016 GNUNET_assert (NULL != ch);
2018 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
2020 for (aux = t->channel_head; aux != NULL; aux = aux->next)
2022 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
2027 aux = GNUNET_new (struct MeshTChannel);
2029 LOG (GNUNET_ERROR_TYPE_DEBUG, " adding %p to %p\n", aux, t->channel_head);
2030 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
2032 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task)
2034 GNUNET_SCHEDULER_cancel (t->destroy_task);
2035 t->destroy_task = GNUNET_SCHEDULER_NO_TASK;
2036 LOG (GNUNET_ERROR_TYPE_DEBUG, " undo destroy!\n");
2042 * Remove a channel from a tunnel.
2045 * @param ch Channel.
2048 GMT_remove_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
2050 struct MeshTChannel *aux;
2052 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
2053 for (aux = t->channel_head; aux != NULL; aux = aux->next)
2057 LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GMCH_2s (ch));
2058 GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
2067 * Search for a channel by global ID.
2069 * @param t Tunnel containing the channel.
2070 * @param chid Public channel number.
2072 * @return channel handler, NULL if doesn't exist
2074 struct MeshChannel *
2075 GMT_get_channel (struct MeshTunnel3 *t, MESH_ChannelNumber chid)
2077 struct MeshTChannel *iter;
2082 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2084 if (GMCH_get_id (iter->ch) == chid)
2088 return NULL == iter ? NULL : iter->ch;
2093 * @brief Destroy a tunnel and free all resources.
2095 * Should only be called a while after the tunnel has been marked as destroyed,
2096 * in case there is a new channel added to the same peer shortly after marking
2097 * the tunnel. This way we avoid a new public key handshake.
2099 * @param cls Closure (tunnel to destroy).
2100 * @param tc Task context.
2103 delayed_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2105 struct MeshTunnel3 *t = cls;
2106 struct MeshTConnection *iter;
2108 t->destroy_task = GNUNET_SCHEDULER_NO_TASK;
2109 t->cstate = MESH_TUNNEL3_SHUTDOWN;
2111 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2113 GMC_send_destroy (iter->c);
2120 * Tunnel is empty: destroy it.
2122 * Notifies all connections about the destruction.
2124 * @param t Tunnel to destroy.
2127 GMT_destroy_empty (struct MeshTunnel3 *t)
2129 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task)
2131 LOG (GNUNET_ERROR_TYPE_DEBUG,
2132 "Tunnel %s is already scheduled for destruction\n",
2135 /* should never happen, tunnel can only become empty once, and the
2136 * task identifier should be NO_TASK (cleaned when the tunnel was created
2137 * or became un-empty)
2142 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s empty: destroying scheduled\n",
2145 t->destroy_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
2146 &delayed_destroy, t);
2151 * Destroy tunnel if empty (no more channels).
2153 * @param t Tunnel to destroy if empty.
2156 GMT_destroy_if_empty (struct MeshTunnel3 *t)
2158 if (1 < GMT_count_channels (t))
2161 GMT_destroy_empty (t);
2166 * Destroy the tunnel.
2168 * This function does not generate any warning traffic to clients or peers.
2171 * Cancel messages belonging to this tunnel queued to neighbors.
2172 * Free any allocated resources linked to the tunnel.
2174 * @param t The tunnel to destroy.
2177 GMT_destroy (struct MeshTunnel3 *t)
2179 struct MeshTConnection *iter_c;
2180 struct MeshTConnection *next_c;
2181 struct MeshTChannel *iter_ch;
2182 struct MeshTChannel *next_ch;
2187 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task)
2189 GNUNET_SCHEDULER_cancel (t->destroy_task);
2190 t->destroy_task = GNUNET_SCHEDULER_NO_TASK;
2193 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GMP_2s (t->peer));
2195 GNUNET_break (GNUNET_YES ==
2196 GNUNET_CONTAINER_multipeermap_remove (tunnels,
2197 GMP_get_id (t->peer), t));
2199 for (iter_c = t->connection_head; NULL != iter_c; iter_c = next_c)
2201 next_c = iter_c->next;
2202 GMC_destroy (iter_c->c);
2204 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = next_ch)
2206 next_ch = iter_ch->next;
2207 GMCH_destroy (iter_ch->ch);
2208 /* Should only happen on shutdown, but it's ok. */
2211 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2212 GMP_set_tunnel (t->peer, NULL);
2214 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
2216 GNUNET_SCHEDULER_cancel (t->rekey_task);
2217 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
2218 if (NULL != t->kx_ctx)
2219 GNUNET_free (t->kx_ctx);
2229 * @brief Use the given path for the tunnel.
2230 * Update the next and prev hops (and RCs).
2231 * (Re)start the path refresh in case the tunnel is locally owned.
2233 * @param t Tunnel to update.
2234 * @param p Path to use.
2236 * @return Connection created.
2238 struct MeshConnection *
2239 GMT_use_path (struct MeshTunnel3 *t, struct MeshPeerPath *p)
2241 struct MeshConnection *c;
2242 struct GNUNET_MESH_Hash cid;
2243 unsigned int own_pos;
2245 if (NULL == t || NULL == p)
2251 if (MESH_TUNNEL3_SHUTDOWN == t->cstate)
2257 for (own_pos = 0; own_pos < p->length; own_pos++)
2259 if (p->peers[own_pos] == myid)
2262 if (own_pos >= p->length)
2264 GNUNET_break_op (0);
2268 GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE, &cid, sizeof (cid));
2269 c = GMC_new (&cid, t, p, own_pos);
2272 /* Path was flawed */
2275 GMT_add_connection (t, c);
2281 * Count established (ready) connections of a tunnel.
2283 * @param t Tunnel on which to count.
2285 * @return Number of connections.
2288 GMT_count_connections (struct MeshTunnel3 *t)
2290 struct MeshTConnection *iter;
2296 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2297 if (MESH_CONNECTION_DESTROYED != GMC_get_state (iter->c))
2304 * Count channels of a tunnel.
2306 * @param t Tunnel on which to count.
2308 * @return Number of channels.
2311 GMT_count_channels (struct MeshTunnel3 *t)
2313 struct MeshTChannel *iter;
2316 for (count = 0, iter = t->channel_head;
2318 iter = iter->next, count++) /* skip */;
2325 * Get the connectivity state of a tunnel.
2329 * @return Tunnel's connectivity state.
2331 enum MeshTunnel3CState
2332 GMT_get_cstate (struct MeshTunnel3 *t)
2337 return (enum MeshTunnel3CState) -1;
2344 * Get the encryption state of a tunnel.
2348 * @return Tunnel's encryption state.
2350 enum MeshTunnel3EState
2351 GMT_get_estate (struct MeshTunnel3 *t)
2356 return (enum MeshTunnel3EState) -1;
2362 * Get the maximum buffer space for a tunnel towards a local client.
2366 * @return Biggest buffer space offered by any channel in the tunnel.
2369 GMT_get_channels_buffer (struct MeshTunnel3 *t)
2371 struct MeshTChannel *iter;
2372 unsigned int buffer;
2373 unsigned int ch_buf;
2375 if (NULL == t->channel_head)
2377 /* Probably getting buffer for a channel create/handshake. */
2382 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2384 ch_buf = get_channel_buffer (iter);
2385 if (ch_buf > buffer)
2393 * Get the total buffer space for a tunnel for P2P traffic.
2397 * @return Buffer space offered by all connections in the tunnel.
2400 GMT_get_connections_buffer (struct MeshTunnel3 *t)
2402 struct MeshTConnection *iter;
2403 unsigned int buffer;
2406 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2408 if (GMC_get_state (iter->c) != MESH_CONNECTION_READY)
2412 buffer += get_connection_buffer (iter);
2420 * Get the tunnel's destination.
2424 * @return ID of the destination peer.
2426 const struct GNUNET_PeerIdentity *
2427 GMT_get_destination (struct MeshTunnel3 *t)
2429 return GMP_get_id (t->peer);
2434 * Get the tunnel's next free global channel ID.
2438 * @return GID of a channel free to use.
2441 GMT_get_next_chid (struct MeshTunnel3 *t)
2443 MESH_ChannelNumber chid;
2444 MESH_ChannelNumber mask;
2447 /* Set bit 30 depending on the ID relationship. Bit 31 is always 0 for GID.
2448 * If our ID is bigger or loopback tunnel, start at 0, bit 30 = 0
2449 * If peer's ID is bigger, start at 0x4... bit 30 = 1
2451 result = GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, GMP_get_id (t->peer));
2456 t->next_chid |= mask;
2458 while (NULL != GMT_get_channel (t, t->next_chid))
2460 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
2461 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
2462 t->next_chid |= mask;
2464 chid = t->next_chid;
2465 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
2466 t->next_chid |= mask;
2473 * Send ACK on one or more channels due to buffer in connections.
2475 * @param t Channel which has some free buffer space.
2478 GMT_unchoke_channels (struct MeshTunnel3 *t)
2480 struct MeshTChannel *iter;
2481 unsigned int buffer;
2482 unsigned int channels = GMT_count_channels (t);
2483 unsigned int choked_n;
2484 struct MeshChannel *choked[channels];
2486 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_unchoke_channels on %s\n", GMT_2s (t));
2487 LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
2488 if (NULL != t->channel_head)
2489 LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
2491 /* Get buffer space */
2492 buffer = GMT_get_connections_buffer (t);
2498 /* Count and remember choked channels */
2500 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2502 if (GNUNET_NO == get_channel_allowed (iter))
2504 choked[choked_n++] = iter->ch;
2508 /* Unchoke random channels */
2509 while (0 < buffer && 0 < choked_n)
2511 unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2513 GMCH_allow_client (choked[r], GMCH_is_origin (choked[r], GNUNET_YES));
2516 choked[r] = choked[choked_n];
2522 * Send ACK on one or more connections due to buffer space to the client.
2524 * Iterates all connections of the tunnel and sends ACKs appropriately.
2529 GMT_send_connection_acks (struct MeshTunnel3 *t)
2531 struct MeshTConnection *iter;
2534 uint32_t allow_per_connection;
2536 unsigned int buffer;
2538 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel send connection ACKs on %s\n",
2547 buffer = GMT_get_channels_buffer (t);
2548 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer %u\n", buffer);
2550 /* Count connections, how many messages are already allowed */
2551 cs = GMT_count_connections (t);
2552 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2554 allowed += get_connection_allowed (iter);
2556 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowed %u\n", allowed);
2558 /* Make sure there is no overflow */
2559 if (allowed > buffer)
2564 /* Authorize connections to send more data */
2565 to_allow = buffer; /* - allowed; */
2567 for (iter = t->connection_head;
2568 NULL != iter && to_allow > 0;
2571 allow_per_connection = to_allow/cs;
2572 to_allow -= allow_per_connection;
2574 if (get_connection_allowed (iter) > 64 / 3)
2578 GMC_allow (iter->c, allow_per_connection,
2579 GMC_is_origin (iter->c, GNUNET_NO));
2582 GNUNET_break (to_allow == 0);
2587 * Cancel a previously sent message while it's in the queue.
2589 * ONLY can be called before the continuation given to the send function
2590 * is called. Once the continuation is called, the message is no longer in the
2593 * @param q Handle to the queue.
2596 GMT_cancel (struct MeshTunnel3Queue *q)
2601 /* tun_message_sent() will be called and free q */
2603 else if (NULL != q->tqd)
2605 unqueue_data (q->tqd);
2607 if (NULL != q->cont)
2608 q->cont (q->cont_cls, NULL, q, 0, 0);
2619 * Sends an already built message on a tunnel, encrypting it and
2620 * choosing the best connection if not provided.
2622 * @param message Message to send. Function modifies it.
2623 * @param t Tunnel on which this message is transmitted.
2624 * @param c Connection to use (autoselect if NULL).
2625 * @param force Force the tunnel to take the message (buffer overfill).
2626 * @param cont Continuation to call once message is really sent.
2627 * @param cont_cls Closure for @c cont.
2629 * @return Handle to cancel message. NULL if @c cont is NULL.
2631 struct MeshTunnel3Queue *
2632 GMT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2633 struct MeshTunnel3 *t, struct MeshConnection *c,
2634 int force, GMT_sent cont, void *cont_cls)
2636 return send_prebuilt_message (message, t, c, force, cont, cont_cls, NULL);
2641 * Is the tunnel directed towards the local peer?
2645 * @return #GNUNET_YES if it is loopback.
2648 GMT_is_loopback (const struct MeshTunnel3 *t)
2650 return (myid == GMP_get_short_id (t->peer));
2655 * Is the tunnel this path already?
2660 * @return #GNUNET_YES a connection uses this path.
2663 GMT_is_path_used (const struct MeshTunnel3 *t, const struct MeshPeerPath *p)
2665 struct MeshTConnection *iter;
2667 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2668 if (GMC_get_path (iter->c) == p)
2676 * Get a cost of a path for a tunnel considering existing connections.
2679 * @param path Candidate path.
2681 * @return Cost of the path (path length + number of overlapping nodes)
2684 GMT_get_path_cost (const struct MeshTunnel3 *t,
2685 const struct MeshPeerPath *path)
2687 struct MeshTConnection *iter;
2688 const struct MeshPeerPath *aux;
2689 unsigned int overlap;
2697 GNUNET_assert (NULL != t);
2699 for (i = 0; i < path->length; i++)
2701 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2703 aux = GMC_get_path (iter->c);
2707 for (j = 0; j < aux->length; j++)
2709 if (path->peers[i] == aux->peers[j])
2717 return path->length + overlap;
2722 * Get the static string for the peer this tunnel is directed.
2726 * @return Static string the destination peer's ID.
2729 GMT_2s (const struct MeshTunnel3 *t)
2734 return GMP_2s (t->peer);
2738 /******************************************************************************/
2739 /***************************** INFO/DEBUG *******************************/
2740 /******************************************************************************/
2744 * Log all possible info about the tunnel state to stderr.
2746 * @param t Tunnel to debug.
2749 GMT_debug (const struct MeshTunnel3 *t)
2751 struct MeshTChannel *iterch;
2752 struct MeshTConnection *iterc;
2754 LOG (GNUNET_ERROR_TYPE_DEBUG, "DEBUG TUNNEL TOWARDS %s\n", GMT_2s (t));
2755 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate %s, estate %s\n",
2756 cstate2s (t->cstate), estate2s (t->estate));
2757 LOG (GNUNET_ERROR_TYPE_DEBUG, " kx_ctx %p, rekey_task %u\n",
2758 t->kx_ctx, t->rekey_task);
2759 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq_head %p, tq_tail %p\n",
2760 t->tq_head, t->tq_tail);
2761 LOG (GNUNET_ERROR_TYPE_DEBUG, " destroy %u\n", t->destroy_task);
2763 LOG (GNUNET_ERROR_TYPE_DEBUG, " channels:\n");
2764 for (iterch = t->channel_head; NULL != iterch; iterch = iterch->next)
2766 LOG (GNUNET_ERROR_TYPE_DEBUG, " - %s\n", GMCH_2s (iterch->ch));
2769 LOG (GNUNET_ERROR_TYPE_DEBUG, " connections:\n");
2770 for (iterc = t->connection_head; NULL != iterc; iterc = iterc->next)
2772 LOG (GNUNET_ERROR_TYPE_DEBUG, " - %s [%u] buf: %u/%u (qn %u/%u)\n",
2773 GMC_2s (iterc->c), GMC_get_state (iterc->c),
2774 GMC_get_buffer (iterc->c, GNUNET_YES),
2775 GMC_get_buffer (iterc->c, GNUNET_NO),
2776 GMC_get_qn (iterc->c, GNUNET_YES),
2777 GMC_get_qn (iterc->c, GNUNET_NO));
2780 LOG (GNUNET_ERROR_TYPE_DEBUG, "DEBUG TUNNEL END\n");
2785 * Iterate all tunnels.
2787 * @param iter Iterator.
2788 * @param cls Closure for @c iter.
2791 GMT_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter, void *cls)
2793 GNUNET_CONTAINER_multipeermap_iterate (tunnels, iter, cls);
2798 * Count all tunnels.
2800 * @return Number of tunnels to remote peers kept by this peer.
2803 GMT_count_all (void)
2805 return GNUNET_CONTAINER_multipeermap_size (tunnels);
2810 * Iterate all connections of a tunnel.
2812 * @param t Tunnel whose connections to iterate.
2813 * @param iter Iterator.
2814 * @param cls Closure for @c iter.
2817 GMT_iterate_connections (struct MeshTunnel3 *t, GMT_conn_iter iter, void *cls)
2819 struct MeshTConnection *ct;
2821 for (ct = t->connection_head; NULL != ct; ct = ct->next)
2827 * Iterate all channels of a tunnel.
2829 * @param t Tunnel whose channels to iterate.
2830 * @param iter Iterator.
2831 * @param cls Closure for @c iter.
2834 GMT_iterate_channels (struct MeshTunnel3 *t, GMT_chan_iter iter, void *cls)
2836 struct MeshTChannel *cht;
2838 for (cht = t->channel_head; NULL != cht; cht = cht->next)
2839 iter (cls, cht->ch);