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 connectivity.
87 enum MeshTunnel3CState cstate;
90 * State of the tunnel encryption.
92 enum MeshTunnel3EState estate;
95 * Key eXchange context.
97 struct MeshTunnelKXCtx *kx_ctx;
100 * Encryption ("our") key.
102 struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
105 * Decryption ("their") key.
107 struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
110 * Task to start the rekey process.
112 GNUNET_SCHEDULER_TaskIdentifier rekey_task;
115 * Paths that are actively used to reach the destination peer.
117 struct MeshTConnection *connection_head;
118 struct MeshTConnection *connection_tail;
121 * Next connection number.
126 * Channels inside this tunnel.
128 struct MeshTChannel *channel_head;
129 struct MeshTChannel *channel_tail;
132 * Channel ID for the next created channel.
134 MESH_ChannelNumber next_chid;
137 * Destroy flag: if true, destroy on last message.
139 GNUNET_SCHEDULER_TaskIdentifier destroy_task;
142 * Queued messages, to transmit once tunnel gets connected.
144 struct MeshTunnelDelayed *tq_head;
145 struct MeshTunnelDelayed *tq_tail;
150 * Struct used to save messages in a non-ready tunnel to send once connected.
152 struct MeshTunnelDelayed
157 struct MeshTunnelDelayed *next;
158 struct MeshTunnelDelayed *prev;
163 struct MeshTunnel3 *t;
166 * Tunnel queue given to the channel to cancel request. Update on send_queued.
168 struct MeshTunnel3Queue *tq;
173 /* struct GNUNET_MessageHeader *msg; */
178 * Handle for messages queued but not yet sent.
180 struct MeshTunnel3Queue
183 * Connection queue handle, to cancel if necessary.
185 struct MeshConnectionQueue *cq;
188 * Handle in case message hasn't been given to a connection yet.
190 struct MeshTunnelDelayed *tqd;
193 * Continuation to call once sent.
198 * Closure for @c cont.
204 /******************************************************************************/
205 /******************************* GLOBALS ***********************************/
206 /******************************************************************************/
209 * Global handle to the statistics service.
211 extern struct GNUNET_STATISTICS_Handle *stats;
214 * Local peer own ID (memory efficient handle).
216 extern GNUNET_PEER_Id myid;
219 * Local peer own ID (full value).
221 extern struct GNUNET_PeerIdentity my_full_id;
225 * Don't try to recover tunnels if shutting down.
227 extern int shutting_down;
231 * Set of all tunnels, in order to trigger a new exchange on rekey.
232 * Indexed by peer's ID.
234 static struct GNUNET_CONTAINER_MultiPeerMap *tunnels;
237 * Default TTL for payload packets.
239 static unsigned long long default_ttl;
244 const static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
247 * Own ephemeral private key.
249 static struct GNUNET_CRYPTO_EcdhePrivateKey *my_ephemeral_key;
252 * Cached message used to perform a key exchange.
254 static struct GNUNET_MESH_KX_Ephemeral kx_msg;
257 * Task to generate a new ephemeral key.
259 static GNUNET_SCHEDULER_TaskIdentifier rekey_task;
264 static struct GNUNET_TIME_Relative rekey_period;
266 /******************************************************************************/
267 /******************************** STATIC ***********************************/
268 /******************************************************************************/
271 * Get string description for tunnel connectivity state.
273 * @param cs Tunnel state.
275 * @return String representation.
278 cstate2s (enum MeshTunnel3CState cs)
280 static char buf[128];
284 case MESH_TUNNEL3_NEW:
285 return "MESH_TUNNEL3_NEW";
286 case MESH_TUNNEL3_SEARCHING:
287 return "MESH_TUNNEL3_SEARCHING";
288 case MESH_TUNNEL3_WAITING:
289 return "MESH_TUNNEL3_WAITING";
290 case MESH_TUNNEL3_READY:
291 return "MESH_TUNNEL3_READY";
294 sprintf (buf, "%u (UNKNOWN STATE)", cs);
302 * Get string description for tunnel encryption state.
304 * @param es Tunnel state.
306 * @return String representation.
309 estate2s (enum MeshTunnel3EState es)
311 static char buf[128];
315 case MESH_TUNNEL3_KEY_UNINITIALIZED:
316 return "MESH_TUNNEL3_KEY_UNINITIALIZED";
317 case MESH_TUNNEL3_KEY_SENT:
318 return "MESH_TUNNEL3_KEY_SENT";
319 case MESH_TUNNEL3_KEY_PING:
320 return "MESH_TUNNEL3_KEY_PING";
321 case MESH_TUNNEL3_KEY_OK:
322 return "MESH_TUNNEL3_KEY_OK";
325 sprintf (buf, "%u (UNKNOWN STATE)", es);
333 * @brief Check if tunnel is ready to send traffic.
335 * Tunnel must be connected and with encryption correctly set up.
337 * @param t Tunnel to check.
339 * @return #GNUNET_YES if ready, #GNUNET_NO otherwise
342 is_ready (struct MeshTunnel3 *t)
347 ready = (MESH_TUNNEL3_READY == t->cstate && MESH_TUNNEL3_KEY_OK == t->estate);
348 ready = ready || GMT_is_loopback (t);
354 * Ephemeral key message purpose size.
356 * @return Size of the part of the ephemeral key message that must be signed.
359 ephemeral_purpose_size (void)
361 return sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
362 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
363 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
364 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
365 sizeof (struct GNUNET_PeerIdentity);
370 * Size of the encrypted part of a ping message.
372 * @return Size of the encrypted part of a ping message.
375 ping_encryption_size (void)
377 return sizeof (struct GNUNET_PeerIdentity) + sizeof (uint32_t);
382 * Get the channel's buffer. ONLY FOR NON-LOOPBACK CHANNELS!!
384 * @param tch Tunnel's channel handle.
386 * @return Amount of messages the channel can still buffer towards the client.
389 get_channel_buffer (const struct MeshTChannel *tch)
393 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
394 fwd = GMCH_is_origin (tch->ch, GNUNET_YES);
396 return GMCH_get_buffer (tch->ch, fwd);
401 * Get the channel's allowance status.
403 * @param tch Tunnel's channel handle.
405 * @return #GNUNET_YES if we allowed the client to send data to us.
408 get_channel_allowed (const struct MeshTChannel *tch)
412 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
413 fwd = GMCH_is_origin (tch->ch, GNUNET_YES);
415 return GMCH_get_allowed (tch->ch, fwd);
420 * Get the connection's buffer.
422 * @param tc Tunnel's connection handle.
424 * @return Amount of messages the connection can still buffer.
427 get_connection_buffer (const struct MeshTConnection *tc)
431 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
432 fwd = GMC_is_origin (tc->c, GNUNET_YES);
434 return GMC_get_buffer (tc->c, fwd);
439 * Get the connection's allowance.
441 * @param tc Tunnel's connection handle.
443 * @return Amount of messages we have allowed the next peer to send us.
446 get_connection_allowed (const struct MeshTConnection *tc)
450 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
451 fwd = GMC_is_origin (tc->c, GNUNET_YES);
453 return GMC_get_allowed (tc->c, fwd);
458 * Check that a ephemeral key message s well formed and correctly signed.
460 * @param t Tunnel on which the message came.
461 * @param msg The ephemeral key message.
463 * @return GNUNET_OK if message is fine, GNUNET_SYSERR otherwise.
466 check_ephemeral (struct MeshTunnel3 *t,
467 const struct GNUNET_MESH_KX_Ephemeral *msg)
469 /* Check message size */
470 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_KX_Ephemeral))
471 return GNUNET_SYSERR;
473 /* Check signature size */
474 if (ntohl (msg->purpose.size) != ephemeral_purpose_size ())
475 return GNUNET_SYSERR;
478 if (0 != memcmp (&msg->origin_identity,
479 GMP_get_id (t->peer),
480 sizeof (struct GNUNET_PeerIdentity)))
481 return GNUNET_SYSERR;
483 /* Check signature */
485 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_MESH_KX,
488 &msg->origin_identity.public_key))
489 return GNUNET_SYSERR;
496 * Encrypt data with the tunnel key.
498 * @param t Tunnel whose key to use.
499 * @param dst Destination for the encrypted data.
500 * @param src Source of the plaintext. Can overlap with @c dst.
501 * @param size Size of the plaintext.
502 * @param iv Initialization Vector to use.
505 t_encrypt (struct MeshTunnel3 *t,
506 void *dst, const void *src,
507 size_t size, uint32_t iv)
509 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
512 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt start\n");
513 GNUNET_CRYPTO_symmetric_derive_iv (&siv, &t->e_key, &iv, sizeof (iv), NULL);
514 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt IV derived\n");
515 out_size = GNUNET_CRYPTO_symmetric_encrypt (src, size, &t->e_key, &siv, dst);
516 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt end\n");
523 * Decrypt data with the tunnel key.
525 * @param t Tunnel whose key to use.
526 * @param dst Destination for the plaintext.
527 * @param src Source of the encrypted data. Can overlap with @c dst.
528 * @param size Size of the encrypted data.
529 * @param iv Initialization Vector to use.
532 t_decrypt (struct MeshTunnel3 *t,
533 void *dst, const void *src,
534 size_t size, uint32_t iv)
536 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
537 struct GNUNET_CRYPTO_SymmetricSessionKey *key;
540 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt start\n");
541 if (t->estate == MESH_TUNNEL3_KEY_OK || t->estate == MESH_TUNNEL3_KEY_PING)
545 else if (NULL != t->kx_ctx)
547 key = &t->kx_ctx->d_key_old;
551 GNUNET_STATISTICS_update (stats, "# non decryptable data", 1, GNUNET_NO);
552 LOG (GNUNET_ERROR_TYPE_DEBUG,
553 "WARNING got data on %s without a valid key\n",
559 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt iv\n");
560 GNUNET_CRYPTO_symmetric_derive_iv (&siv, key, &iv, sizeof (iv), NULL);
561 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt iv done\n");
562 out_size = GNUNET_CRYPTO_symmetric_decrypt (src, size, key, &siv, dst);
563 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt end\n");
570 * Create key material by doing ECDH on the local and remote ephemeral keys.
572 * @param key_material Where to store the key material.
573 * @param ephemeral_key Peer's public ephemeral key.
576 derive_key_material (struct GNUNET_HashCode *key_material,
577 const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key)
580 GNUNET_CRYPTO_ecc_ecdh (my_ephemeral_key,
589 * Create a symmetic key from the identities of both ends and the key material
592 * @param key Destination for the generated key.
593 * @param sender ID of the peer that will encrypt with @c key.
594 * @param receiver ID of the peer that will decrypt with @c key.
595 * @param key_material Hash created with ECDH with the ephemeral keys.
598 derive_symmertic (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
599 const struct GNUNET_PeerIdentity *sender,
600 const struct GNUNET_PeerIdentity *receiver,
601 const struct GNUNET_HashCode *key_material)
603 const char salt[] = "MESH kx salt";
605 GNUNET_CRYPTO_kdf (key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
607 key_material, sizeof (struct GNUNET_HashCode),
608 sender, sizeof (struct GNUNET_PeerIdentity),
609 receiver, sizeof (struct GNUNET_PeerIdentity),
614 * Pick a connection on which send the next data message.
616 * @param t Tunnel on which to send the message.
618 * @return The connection on which to send the next message.
620 static struct MeshConnection *
621 tunnel_get_connection (struct MeshTunnel3 *t)
623 struct MeshTConnection *iter;
624 struct MeshConnection *best;
626 unsigned int lowest_q;
628 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GMP_2s (t->peer));
631 for (iter = t->connection_head; NULL != iter; iter = iter->next)
633 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
634 GMC_2s (iter->c), GMC_get_state (iter->c));
635 if (MESH_CONNECTION_READY == GMC_get_state (iter->c))
637 qn = GMC_get_qn (iter->c, GMC_is_origin (iter->c, GNUNET_YES));
638 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
646 LOG (GNUNET_ERROR_TYPE_DEBUG, " selected: connection %s\n", GMC_2s (best));
652 * Callback called when a queued message is sent.
654 * Calculates the average time and connection packet tracking.
656 * @param cls Closure (TunnelQueue handle).
657 * @param c Connection this message was on.
658 * @param q Connection queue handle (unused).
659 * @param type Type of message sent.
660 * @param fwd Was this a FWD going message?
661 * @param size Size of the message.
664 message_sent (void *cls,
665 struct MeshConnection *c,
666 struct MeshConnectionQueue *q,
667 uint16_t type, int fwd, size_t size)
669 struct MeshTunnel3Queue *qt = cls;
671 GNUNET_assert (NULL != qt->cont);
672 qt->cont (qt->cont_cls, GMC_get_tunnel (c), qt, type, size);
678 * Delete a queued message: either was sent or the channel was destroyed
679 * before the tunnel's key exchange had a chance to finish.
681 * @param tqd Delayed queue handle.
684 unqueue_data (struct MeshTunnelDelayed *tqd)
686 GNUNET_CONTAINER_DLL_remove (tqd->t->tq_head, tqd->t->tq_tail, tqd);
692 * Cache a message to be sent once tunnel is online.
694 * @param t Tunnel to hold the message.
695 * @param msg Message itself (copy will be made).
697 static struct MeshTunnelDelayed *
698 queue_data (struct MeshTunnel3 *t, const struct GNUNET_MessageHeader *msg)
700 struct MeshTunnelDelayed *tqd;
701 uint16_t size = ntohs (msg->size);
703 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue data on Tunnel %s\n", GMT_2s (t));
705 if (GNUNET_YES == is_ready (t))
711 tqd = GNUNET_malloc (sizeof (struct MeshTunnelDelayed) + size);
714 memcpy (&tqd[1], msg, size);
715 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tqd);
723 * @param t Tunnel to get keys from.
724 * @param plaintext Content to HMAC.
725 * @param size Size of @c plaintext.
726 * @param iv Initialization vector for the message.
727 * @param outgoing Is this an outgoing message that we encrypted?
728 * @param hmac Destination to store the HMAC.
731 t_hmac (struct MeshTunnel3 *t, const void *plaintext, size_t size, uint32_t iv,
732 int outgoing, struct GNUNET_HashCode *hmac)
734 struct GNUNET_CRYPTO_AuthKey auth_key;
735 static const char ctx[] = "mesh authentication key";
736 struct GNUNET_CRYPTO_SymmetricSessionKey *key;
738 key = outgoing ? &t->e_key : &t->d_key;
739 GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
744 GNUNET_CRYPTO_hmac (&auth_key, plaintext, size, hmac);
749 * Sends an already built message on a tunnel, encrypting it and
750 * choosing the best connection.
752 * @param message Message to send. Function modifies it.
753 * @param t Tunnel on which this message is transmitted.
754 * @param c Connection to use (autoselect if NULL).
755 * @param force Force the tunnel to take the message (buffer overfill).
756 * @param cont Continuation to call once message is really sent.
757 * @param cont_cls Closure for @c cont.
758 * @param existing_q In case this a transmission of previously queued data,
759 * this should be TunnelQueue given to the client.
762 * @return Handle to cancel message. NULL if @c cont is NULL.
764 static struct MeshTunnel3Queue *
765 send_prebuilt_message (const struct GNUNET_MessageHeader *message,
766 struct MeshTunnel3 *t, struct MeshConnection *c,
767 int force, GMT_sent cont, void *cont_cls,
768 struct MeshTunnel3Queue *existing_q)
770 struct MeshTunnel3Queue *tq;
771 struct GNUNET_MESH_Encrypted *msg;
772 size_t size = ntohs (message->size);
773 char cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
778 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GMT_2s (t));
780 if (GNUNET_NO == is_ready (t))
782 struct MeshTunnelDelayed *tqd;
783 /* A non null existing_q indicates sending of queued data.
784 * Should only happen after tunnel becomes ready.
786 GNUNET_assert (NULL == existing_q);
787 tqd = queue_data (t, message);
790 tq = GNUNET_new (struct MeshTunnel3Queue);
794 tq->cont_cls = cont_cls;
798 GNUNET_assert (GNUNET_NO == GMT_is_loopback (t));
800 iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
801 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
802 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED);
804 GNUNET_assert (t_encrypt (t, &msg[1], message, size, iv) == size);
805 t_hmac (t, message, size, iv, GNUNET_YES, &msg->hmac);
806 msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size);
809 c = tunnel_get_connection (t);
812 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task
813 || MESH_TUNNEL3_SEARCHING != t->cstate)
821 type = ntohs (message->type);
824 case GNUNET_MESSAGE_TYPE_MESH_KEEPALIVE:
825 case GNUNET_MESSAGE_TYPE_MESH_DATA:
826 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
827 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
828 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
829 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
830 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK:
831 msg->cid = *GMC_get_id (c);
832 msg->ttl = htonl (default_ttl);
835 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
840 fwd = GMC_is_origin (c, GNUNET_YES);
844 (void) GMC_send_prebuilt_message (&msg->header, c, fwd, force, NULL, NULL);
847 if (NULL == existing_q)
849 tq = GNUNET_new (struct MeshTunnel3Queue); /* FIXME valgrind: leak*/
856 tq->cq = GMC_send_prebuilt_message (&msg->header, c, fwd, force,
859 tq->cont_cls = cont_cls;
866 * Send all cached messages that we can, tunnel is online.
868 * @param t Tunnel that holds the messages. Cannot be loopback.
871 send_queued_data (struct MeshTunnel3 *t)
873 struct MeshTunnelDelayed *tqd;
874 struct MeshTunnelDelayed *next;
877 LOG (GNUNET_ERROR_TYPE_DEBUG,
878 "GMT_send_queued_data on tunnel %s\n",
881 if (GMT_is_loopback (t))
887 if (GNUNET_NO == is_ready (t))
889 LOG (GNUNET_ERROR_TYPE_DEBUG, " not ready yet: %s/%s\n",
890 estate2s (t->estate), cstate2s (t->cstate));
894 room = GMT_get_connections_buffer (t);
895 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
896 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq head: %p\n", t->tq_head);
897 for (tqd = t->tq_head; NULL != tqd && room > 0; tqd = next)
899 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending queued data\n");
902 send_prebuilt_message ((struct GNUNET_MessageHeader *) &tqd[1],
903 tqd->t, NULL, GNUNET_YES,
904 NULL != tqd->tq ? tqd->tq->cont : NULL,
905 NULL != tqd->tq ? tqd->tq->cont_cls : NULL,
909 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_send_queued_data end\n", GMP_2s (t->peer));
914 * Sends key exchange message on a tunnel, choosing the best connection.
915 * Should not be called on loopback tunnels.
917 * @param t Tunnel on which this message is transmitted.
918 * @param message Message to send. Function modifies it.
921 send_kx (struct MeshTunnel3 *t,
922 const struct GNUNET_MessageHeader *message)
924 struct MeshConnection *c;
925 struct GNUNET_MESH_KX *msg;
926 size_t size = ntohs (message->size);
927 char cbuf[sizeof (struct GNUNET_MESH_KX) + size];
931 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT KX on Tunnel %s\n", GMT_2s (t));
933 /* Avoid loopback. */
934 if (GMT_is_loopback (t))
936 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback!\n");
941 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task)
943 LOG (GNUNET_ERROR_TYPE_DEBUG, " being destroyed, why bother\n");
947 /* Must have a connection. */
948 if (NULL == t->connection_head)
950 GNUNET_break (MESH_TUNNEL3_SEARCHING == t->cstate);
955 msg = (struct GNUNET_MESH_KX *) cbuf;
956 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX);
957 msg->header.size = htons (sizeof (struct GNUNET_MESH_KX) + size);
958 c = tunnel_get_connection (t);
961 GNUNET_break (GNUNET_SCHEDULER_NO_TASK != t->destroy_task
962 || MESH_TUNNEL3_READY != t->cstate);
966 type = ntohs (message->type);
969 case GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL:
970 case GNUNET_MESSAGE_TYPE_MESH_KX_PING:
971 case GNUNET_MESSAGE_TYPE_MESH_KX_PONG:
972 memcpy (&msg[1], message, size);
975 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
980 fwd = GMC_is_origin (t->connection_head->c, GNUNET_YES);
981 /* TODO save handle and cancel in case of a unneeded retransmission */
982 GMC_send_prebuilt_message (&msg->header, c, fwd, GNUNET_YES, NULL, NULL);
987 * Send the ephemeral key on a tunnel.
989 * @param t Tunnel on which to send the key.
992 send_ephemeral (struct MeshTunnel3 *t)
994 LOG (GNUNET_ERROR_TYPE_INFO, "=> EPHM for %s\n", GMT_2s (t));
996 kx_msg.sender_status = htonl (t->estate);
997 send_kx (t, &kx_msg.header);
1001 * Send a ping message on a tunnel.
1003 * @param t Tunnel on which to send the ping.
1006 send_ping (struct MeshTunnel3 *t)
1008 struct GNUNET_MESH_KX_Ping msg;
1010 LOG (GNUNET_ERROR_TYPE_INFO, "=> PING for %s\n", GMT_2s (t));
1011 msg.header.size = htons (sizeof (msg));
1012 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_PING);
1013 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1014 msg.target = *GMP_get_id (t->peer);
1015 msg.nonce = t->kx_ctx->challenge;
1017 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
1018 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&msg.target));
1019 t_encrypt (t, &msg.target, &msg.target, ping_encryption_size(), msg.iv);
1020 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
1021 LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg.target));
1023 send_kx (t, &msg.header);
1028 * Send a pong message on a tunnel.
1030 * @param t Tunnel on which to send the pong.
1031 * @param challenge Value sent in the ping that we have to send back.
1034 send_pong (struct MeshTunnel3 *t, uint32_t challenge)
1036 struct GNUNET_MESH_KX_Pong msg;
1038 LOG (GNUNET_ERROR_TYPE_INFO, "=> PONG for %s\n", GMT_2s (t));
1039 msg.header.size = htons (sizeof (msg));
1040 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_PONG);
1041 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1042 msg.nonce = challenge;
1043 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
1044 t_encrypt (t, &msg.nonce, &msg.nonce, sizeof (msg.nonce), msg.iv);
1045 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
1047 send_kx (t, &msg.header);
1052 * Initiate a rekey with the remote peer.
1054 * @param cls Closure (tunnel).
1055 * @param tc TaskContext.
1058 rekey_tunnel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1060 struct MeshTunnel3 *t = cls;
1062 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
1064 LOG (GNUNET_ERROR_TYPE_DEBUG, "Re-key Tunnel %s\n", GMT_2s (t));
1065 if (NULL != tc && 0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1068 if (NULL == t->kx_ctx)
1070 LOG (GNUNET_ERROR_TYPE_DEBUG, " new kx ctx\n");
1071 t->kx_ctx = GNUNET_new (struct MeshTunnelKXCtx);
1072 t->kx_ctx->challenge =
1073 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1074 t->kx_ctx->d_key_old = t->d_key;
1075 LOG (GNUNET_ERROR_TYPE_DEBUG, " new challenge for %s: %u\n",
1076 GMT_2s (t), t->kx_ctx->challenge);
1081 case MESH_TUNNEL3_KEY_UNINITIALIZED:
1082 t->estate = MESH_TUNNEL3_KEY_SENT;
1084 case MESH_TUNNEL3_KEY_SENT:
1086 case MESH_TUNNEL3_KEY_PING:
1087 case MESH_TUNNEL3_KEY_OK:
1089 t->estate = MESH_TUNNEL3_KEY_PING;
1092 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unexpected state %u\n", t->estate);
1095 LOG (GNUNET_ERROR_TYPE_DEBUG, " next call in %s\n",
1096 GNUNET_STRINGS_relative_time_to_string (REKEY_WAIT, GNUNET_YES));
1097 t->rekey_task = GNUNET_SCHEDULER_add_delayed (REKEY_WAIT, &rekey_tunnel, t);
1102 * Out ephemeral key has changed, create new session key on all tunnels.
1104 * @param cls Closure (size of the hashmap).
1105 * @param key Current public key.
1106 * @param value Value in the hash map (tunnel).
1108 * @return #GNUNET_YES, so we should continue to iterate,
1111 rekey_iterator (void *cls,
1112 const struct GNUNET_PeerIdentity *key,
1115 struct MeshTunnel3 *t = value;
1116 struct GNUNET_TIME_Relative delay;
1117 long n = (long) cls;
1120 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
1123 if (GNUNET_YES == GMT_is_loopback (t))
1126 r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, (uint32_t) n * 100);
1127 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, r);
1128 t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
1135 * Create a new ephemeral key and key message, schedule next rekeying.
1137 * @param cls Closure (unused).
1138 * @param tc TaskContext.
1141 rekey (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1143 struct GNUNET_TIME_Absolute time;
1146 rekey_task = GNUNET_SCHEDULER_NO_TASK;
1148 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1151 GNUNET_free_non_null (my_ephemeral_key);
1152 my_ephemeral_key = GNUNET_CRYPTO_ecdhe_key_create ();
1154 time = GNUNET_TIME_absolute_get ();
1155 kx_msg.creation_time = GNUNET_TIME_absolute_hton (time);
1156 time = GNUNET_TIME_absolute_add (time, rekey_period);
1157 time = GNUNET_TIME_absolute_add (time, GNUNET_TIME_UNIT_MINUTES);
1158 kx_msg.expiration_time = GNUNET_TIME_absolute_hton (time);
1159 GNUNET_CRYPTO_ecdhe_key_get_public (my_ephemeral_key, &kx_msg.ephemeral_key);
1161 GNUNET_assert (GNUNET_OK ==
1162 GNUNET_CRYPTO_eddsa_sign (my_private_key,
1164 &kx_msg.signature));
1166 n = (long) GNUNET_CONTAINER_multipeermap_size (tunnels);
1167 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &rekey_iterator, (void *) n);
1169 rekey_task = GNUNET_SCHEDULER_add_delayed (rekey_period, &rekey, NULL);
1174 * Called only on shutdown, destroy every tunnel.
1176 * @param cls Closure (unused).
1177 * @param key Current public key.
1178 * @param value Value in the hash map (tunnel).
1180 * @return #GNUNET_YES, so we should continue to iterate,
1183 destroy_iterator (void *cls,
1184 const struct GNUNET_PeerIdentity *key,
1187 struct MeshTunnel3 *t = value;
1195 * Notify remote peer that we don't know a channel he is talking about,
1196 * probably CHANNEL_DESTROY was missed.
1198 * @param t Tunnel on which to notify.
1199 * @param gid ID of the channel.
1202 send_channel_destroy (struct MeshTunnel3 *t, unsigned int gid)
1204 struct GNUNET_MESH_ChannelManage msg;
1206 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
1207 msg.header.size = htons (sizeof (msg));
1208 msg.chid = htonl (gid);
1210 LOG (GNUNET_ERROR_TYPE_DEBUG,
1211 "WARNING destroying unknown channel %u on tunnel %s\n",
1213 send_prebuilt_message (&msg.header, t, NULL, GNUNET_YES, NULL, NULL, NULL);
1218 * Demultiplex data per channel and call appropriate channel handler.
1220 * @param t Tunnel on which the data came.
1221 * @param msg Data message.
1222 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1223 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1224 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1225 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1228 handle_data (struct MeshTunnel3 *t,
1229 const struct GNUNET_MESH_Data *msg,
1232 struct MeshChannel *ch;
1236 size = ntohs (msg->header.size);
1238 sizeof (struct GNUNET_MESH_Data) +
1239 sizeof (struct GNUNET_MessageHeader))
1244 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
1245 GM_m2s (ntohs (msg[1].header.type)));
1248 ch = GMT_get_channel (t, ntohl (msg->chid));
1251 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
1253 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel 0x%X unknown\n",
1255 send_channel_destroy (t, ntohl (msg->chid));
1259 GMCH_handle_data (ch, msg, fwd);
1264 * Demultiplex data ACKs per channel and update appropriate channel buffer info.
1266 * @param t Tunnel on which the DATA ACK came.
1267 * @param msg DATA ACK message.
1268 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1269 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1270 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1271 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1274 handle_data_ack (struct MeshTunnel3 *t,
1275 const struct GNUNET_MESH_DataACK *msg,
1278 struct MeshChannel *ch;
1282 size = ntohs (msg->header.size);
1283 if (size != sizeof (struct GNUNET_MESH_DataACK))
1290 ch = GMT_get_channel (t, ntohl (msg->chid));
1293 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
1295 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1300 GMCH_handle_data_ack (ch, msg, fwd);
1305 * Handle channel create.
1307 * @param t Tunnel on which the data came.
1308 * @param msg Data message.
1311 handle_ch_create (struct MeshTunnel3 *t,
1312 const struct GNUNET_MESH_ChannelCreate *msg)
1314 struct MeshChannel *ch;
1318 size = ntohs (msg->header.size);
1319 if (size != sizeof (struct GNUNET_MESH_ChannelCreate))
1326 ch = GMT_get_channel (t, ntohl (msg->chid));
1327 if (NULL != ch && ! GMT_is_loopback (t))
1329 /* Probably a retransmission, safe to ignore */
1330 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
1334 ch = GMCH_handle_create (t, msg);
1337 GMT_add_channel (t, ch);
1343 * Handle channel NACK: check correctness and call channel handler for NACKs.
1345 * @param t Tunnel on which the NACK came.
1346 * @param msg NACK message.
1349 handle_ch_nack (struct MeshTunnel3 *t,
1350 const struct GNUNET_MESH_ChannelManage *msg)
1352 struct MeshChannel *ch;
1356 size = ntohs (msg->header.size);
1357 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1364 ch = GMT_get_channel (t, ntohl (msg->chid));
1367 GNUNET_STATISTICS_update (stats, "# channel NACK on unknown channel",
1369 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1374 GMCH_handle_nack (ch);
1379 * Handle a CHANNEL ACK (SYNACK/ACK).
1381 * @param t Tunnel on which the CHANNEL ACK came.
1382 * @param msg CHANNEL ACK message.
1383 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1384 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1385 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1386 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1389 handle_ch_ack (struct MeshTunnel3 *t,
1390 const struct GNUNET_MESH_ChannelManage *msg,
1393 struct MeshChannel *ch;
1397 size = ntohs (msg->header.size);
1398 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1405 ch = GMT_get_channel (t, ntohl (msg->chid));
1408 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
1410 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1415 GMCH_handle_ack (ch, msg, fwd);
1421 * Handle a channel destruction message.
1423 * @param t Tunnel on which the message came.
1424 * @param msg Channel destroy message.
1425 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1426 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1427 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1428 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1431 handle_ch_destroy (struct MeshTunnel3 *t,
1432 const struct GNUNET_MESH_ChannelManage *msg,
1435 struct MeshChannel *ch;
1439 size = ntohs (msg->header.size);
1440 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1447 ch = GMT_get_channel (t, ntohl (msg->chid));
1450 /* Probably a retransmission, safe to ignore */
1454 GMCH_handle_destroy (ch, msg, fwd);
1459 * The peer's ephemeral key has changed: update the symmetrical keys.
1461 * @param t Tunnel this message came on.
1462 * @param msg Key eXchange message.
1465 handle_ephemeral (struct MeshTunnel3 *t,
1466 const struct GNUNET_MESH_KX_Ephemeral *msg)
1468 struct GNUNET_HashCode km;
1469 LOG (GNUNET_ERROR_TYPE_INFO, "<= EPHM for %s\n", GMT_2s (t));
1471 if (GNUNET_OK != check_ephemeral (t, msg))
1473 GNUNET_break_op (0);
1476 derive_key_material (&km, &msg->ephemeral_key);
1477 LOG (GNUNET_ERROR_TYPE_DEBUG, " km is %s\n", GNUNET_h2s (&km));
1478 derive_symmertic (&t->e_key, &my_full_id, GMP_get_id (t->peer), &km);
1479 derive_symmertic (&t->d_key, GMP_get_id (t->peer), &my_full_id, &km);
1480 if (MESH_TUNNEL3_KEY_SENT == t->estate)
1482 LOG (GNUNET_ERROR_TYPE_DEBUG, " our key was sent, send ping\n");
1484 t->estate = MESH_TUNNEL3_KEY_PING;
1490 * Peer wants to check our symmetrical keys by sending an encrypted challenge.
1491 * Answer with by retransmitting the challenge with the "opposite" key.
1493 * @param t Tunnel this message came on.
1494 * @param msg Key eXchange Ping message.
1497 handle_ping (struct MeshTunnel3 *t,
1498 const struct GNUNET_MESH_KX_Ping *msg)
1500 struct GNUNET_MESH_KX_Ping res;
1502 if (ntohs (msg->header.size) != sizeof (res))
1504 GNUNET_break_op (0);
1508 LOG (GNUNET_ERROR_TYPE_INFO, "<= PING for %s\n", GMT_2s (t));
1509 t_decrypt (t, &res.target, &msg->target, ping_encryption_size (), msg->iv);
1510 if (0 != memcmp (&my_full_id, &res.target, sizeof (my_full_id)))
1512 GNUNET_STATISTICS_update (stats, "# malformed PINGs", 1, GNUNET_NO);
1513 LOG (GNUNET_ERROR_TYPE_WARNING, " malformed PING\n");
1514 LOG (GNUNET_ERROR_TYPE_DEBUG, " e got %u\n", msg->nonce);
1515 LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg->target));
1516 LOG (GNUNET_ERROR_TYPE_DEBUG, " got %u\n", res.nonce);
1517 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&res.target));
1521 send_pong (t, res.nonce);
1526 * Peer has answer to our challenge.
1527 * If answer is successful, consider the key exchange finished and clean
1528 * up all related state.
1530 * @param t Tunnel this message came on.
1531 * @param msg Key eXchange Pong message.
1534 handle_pong (struct MeshTunnel3 *t,
1535 const struct GNUNET_MESH_KX_Pong *msg)
1539 LOG (GNUNET_ERROR_TYPE_INFO, "<= PONG for %s\n", GMT_2s (t));
1540 if (GNUNET_SCHEDULER_NO_TASK == t->rekey_task)
1542 GNUNET_STATISTICS_update (stats, "# duplicate PONG messages", 1, GNUNET_NO);
1545 t_decrypt (t, &challenge, &msg->nonce, sizeof (uint32_t), msg->iv);
1547 if (challenge != t->kx_ctx->challenge)
1549 LOG (GNUNET_ERROR_TYPE_WARNING, "Wrong PONG challenge\n");
1550 LOG (GNUNET_ERROR_TYPE_DEBUG, "PONG: %u (e: %u). Expected: %u.\n",
1551 challenge, msg->nonce, t->kx_ctx->challenge);
1552 GNUNET_break_op (0);
1555 GNUNET_SCHEDULER_cancel (t->rekey_task);
1556 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
1557 GNUNET_free (t->kx_ctx);
1559 GMT_change_estate (t, MESH_TUNNEL3_KEY_OK);
1564 * Demultiplex by message type and call appropriate handler for a message
1565 * towards a channel of a local tunnel.
1567 * @param t Tunnel this message came on.
1568 * @param msgh Message header.
1569 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1570 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1571 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1572 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1575 handle_decrypted (struct MeshTunnel3 *t,
1576 const struct GNUNET_MessageHeader *msgh,
1581 type = ntohs (msgh->type);
1582 LOG (GNUNET_ERROR_TYPE_INFO, "<= %s on %s\n", GM_m2s (type), GMT_2s (t));
1586 case GNUNET_MESSAGE_TYPE_MESH_KEEPALIVE:
1587 /* Do nothing, connection aleady got updated. */
1590 case GNUNET_MESSAGE_TYPE_MESH_DATA:
1591 /* Don't send hop ACK, wait for client to ACK */
1592 handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
1595 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
1596 handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
1599 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1600 handle_ch_create (t,
1601 (struct GNUNET_MESH_ChannelCreate *) msgh);
1604 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK:
1606 (struct GNUNET_MESH_ChannelManage *) msgh);
1609 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
1611 (struct GNUNET_MESH_ChannelManage *) msgh,
1615 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1616 handle_ch_destroy (t,
1617 (struct GNUNET_MESH_ChannelManage *) msgh,
1622 GNUNET_break_op (0);
1623 LOG (GNUNET_ERROR_TYPE_WARNING,
1624 "end-to-end message not known (%u)\n",
1625 ntohs (msgh->type));
1630 /******************************************************************************/
1631 /******************************** API ***********************************/
1632 /******************************************************************************/
1635 * Decrypt and demultiplex by message type. Call appropriate handler
1636 * for every message.
1638 * @param t Tunnel this message came on.
1639 * @param msg Encrypted message.
1642 GMT_handle_encrypted (struct MeshTunnel3 *t,
1643 const struct GNUNET_MESH_Encrypted *msg)
1645 size_t size = ntohs (msg->header.size);
1646 size_t payload_size = size - sizeof (struct GNUNET_MESH_Encrypted);
1647 size_t decrypted_size;
1648 char cbuf [payload_size];
1649 struct GNUNET_MessageHeader *msgh;
1651 struct GNUNET_HashCode hmac;
1653 decrypted_size = t_decrypt (t, cbuf, &msg[1], payload_size, msg->iv);
1654 t_hmac (t, cbuf, payload_size, msg->iv, GNUNET_NO, &hmac);
1655 if (0 != memcmp (&hmac, &msg->hmac, sizeof (struct GNUNET_HashCode)))
1657 /* checksum failed */
1658 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1659 "Failed checksum validation for a message on tunnel `%s'\n",
1661 GNUNET_STATISTICS_update (stats, "# wrong HMAC", 1, GNUNET_NO);
1665 while (off < decrypted_size)
1667 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
1668 handle_decrypted (t, msgh, GNUNET_SYSERR);
1669 off += ntohs (msgh->size);
1675 * Demultiplex an encapsulated KX message by message type.
1677 * @param t Tunnel on which the message came.
1678 * @param message Payload of KX message.
1681 GMT_handle_kx (struct MeshTunnel3 *t,
1682 const struct GNUNET_MessageHeader *message)
1686 type = ntohs (message->type);
1687 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message received\n", type);
1690 case GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL:
1691 handle_ephemeral (t, (struct GNUNET_MESH_KX_Ephemeral *) message);
1694 case GNUNET_MESSAGE_TYPE_MESH_KX_PING:
1695 handle_ping (t, (struct GNUNET_MESH_KX_Ping *) message);
1698 case GNUNET_MESSAGE_TYPE_MESH_KX_PONG:
1699 handle_pong (t, (struct GNUNET_MESH_KX_Pong *) message);
1703 GNUNET_break_op (0);
1704 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message not known (%u)\n", type);
1710 * Initialize the tunnel subsystem.
1712 * @param c Configuration handle.
1713 * @param key ECC private key, to derive all other keys and do crypto.
1716 GMT_init (const struct GNUNET_CONFIGURATION_Handle *c,
1717 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
1719 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
1721 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
1724 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1725 "MESH", "DEFAULT_TTL", "USING DEFAULT");
1729 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REKEY_PERIOD",
1732 rekey_period = GNUNET_TIME_UNIT_DAYS;
1735 my_private_key = key;
1736 kx_msg.header.size = htons (sizeof (kx_msg));
1737 kx_msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL);
1738 kx_msg.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_MESH_KX);
1739 kx_msg.purpose.size = htonl (ephemeral_purpose_size ());
1740 kx_msg.origin_identity = my_full_id;
1741 rekey_task = GNUNET_SCHEDULER_add_now (&rekey, NULL);
1743 tunnels = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1748 * Shut down the tunnel subsystem.
1753 if (GNUNET_SCHEDULER_NO_TASK != rekey_task)
1755 GNUNET_SCHEDULER_cancel (rekey_task);
1756 rekey_task = GNUNET_SCHEDULER_NO_TASK;
1758 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &destroy_iterator, NULL);
1759 GNUNET_CONTAINER_multipeermap_destroy (tunnels);
1766 * @param destination Peer this tunnel is towards.
1768 struct MeshTunnel3 *
1769 GMT_new (struct MeshPeer *destination)
1771 struct MeshTunnel3 *t;
1773 t = GNUNET_new (struct MeshTunnel3);
1775 t->peer = destination;
1778 GNUNET_CONTAINER_multipeermap_put (tunnels, GMP_get_id (destination), t,
1779 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1790 * Change the tunnel's connection state.
1792 * @param t Tunnel whose connection state to change.
1793 * @param cstate New connection state.
1796 GMT_change_cstate (struct MeshTunnel3* t, enum MeshTunnel3CState cstate)
1800 LOG (GNUNET_ERROR_TYPE_DEBUG,
1801 "Tunnel %s cstate was %s\n",
1802 GMP_2s (t->peer), cstate2s (t->cstate));
1803 LOG (GNUNET_ERROR_TYPE_DEBUG,
1804 "Tunnel %s cstate is now %s\n",
1805 GMP_2s (t->peer), cstate2s (cstate));
1806 if (myid != GMP_get_short_id (t->peer) &&
1807 MESH_TUNNEL3_READY != t->cstate &&
1808 MESH_TUNNEL3_READY == cstate)
1811 if (MESH_TUNNEL3_KEY_OK == t->estate)
1813 LOG (GNUNET_ERROR_TYPE_DEBUG, " triggered send queued data\n");
1814 send_queued_data (t);
1816 else if (MESH_TUNNEL3_KEY_UNINITIALIZED == t->estate)
1818 LOG (GNUNET_ERROR_TYPE_DEBUG, " triggered rekey\n");
1819 rekey_tunnel (t, NULL);
1824 if (MESH_TUNNEL3_READY == cstate && 3 <= GMT_count_connections (t))
1826 GMP_stop_search (t->peer);
1831 * Change the tunnel encryption state.
1833 * @param t Tunnel whose encryption state to change.
1834 * @param state New encryption state.
1837 GMT_change_estate (struct MeshTunnel3* t, enum MeshTunnel3EState state)
1841 LOG (GNUNET_ERROR_TYPE_DEBUG,
1842 "Tunnel %s estate was %s\n",
1843 GMP_2s (t->peer), estate2s (t->estate));
1844 LOG (GNUNET_ERROR_TYPE_DEBUG,
1845 "Tunnel %s estate is now %s\n",
1846 GMP_2s (t->peer), estate2s (state));
1847 if (myid != GMP_get_short_id (t->peer) &&
1848 MESH_TUNNEL3_KEY_OK != t->estate && MESH_TUNNEL3_KEY_OK == state)
1851 send_queued_data (t);
1859 * Add a connection to a tunnel.
1862 * @param c Connection.
1865 GMT_add_connection (struct MeshTunnel3 *t, struct MeshConnection *c)
1867 struct MeshTConnection *aux;
1869 GNUNET_assert (NULL != c);
1871 for (aux = t->connection_head; aux != NULL; aux = aux->next)
1875 aux = GNUNET_new (struct MeshTConnection);
1877 GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, aux);
1882 * Mark a path as no longer valid for this tunnel: has been tried and failed.
1884 * @param t Tunnel to update.
1885 * @param path Invalid path to remove. Is destroyed after removal.
1888 GMT_remove_path (struct MeshTunnel3 *t, struct MeshPeerPath *path)
1890 GMP_remove_path (t->peer, path);
1895 * Remove a connection from a tunnel.
1898 * @param c Connection.
1901 GMT_remove_connection (struct MeshTunnel3 *t,
1902 struct MeshConnection *c)
1904 struct MeshTConnection *aux;
1905 struct MeshTConnection *next;
1907 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing connection %s from tunnel %s\n",
1908 GMC_2s (c), GMT_2s (t));
1909 for (aux = t->connection_head; aux != NULL; aux = next)
1914 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
1919 /* Start new connections if needed */
1920 if (NULL == t->connection_head
1921 && GNUNET_SCHEDULER_NO_TASK == t->destroy_task
1922 && MESH_TUNNEL3_SHUTDOWN != t->cstate
1923 && GNUNET_NO == shutting_down)
1925 LOG (GNUNET_ERROR_TYPE_DEBUG, " no more connections, getting new ones\n");
1926 GMP_connect (t->peer);
1927 t->cstate = MESH_TUNNEL3_SEARCHING;
1931 /* If not marked as ready, no change is needed */
1932 if (MESH_TUNNEL3_READY != t->cstate)
1935 /* Check if any connection is ready to maintaing cstate */
1936 for (aux = t->connection_head; aux != NULL; aux = aux->next)
1937 if (MESH_CONNECTION_READY == GMC_get_state (aux->c))
1940 t->cstate = MESH_TUNNEL3_WAITING;
1945 * Add a channel to a tunnel.
1948 * @param ch Channel.
1951 GMT_add_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
1953 struct MeshTChannel *aux;
1955 GNUNET_assert (NULL != ch);
1957 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
1959 for (aux = t->channel_head; aux != NULL; aux = aux->next)
1961 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
1966 aux = GNUNET_new (struct MeshTChannel);
1968 LOG (GNUNET_ERROR_TYPE_DEBUG, " adding %p to %p\n", aux, t->channel_head);
1969 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
1971 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task)
1973 GNUNET_SCHEDULER_cancel (t->destroy_task);
1974 t->destroy_task = GNUNET_SCHEDULER_NO_TASK;
1975 LOG (GNUNET_ERROR_TYPE_DEBUG, " undo destroy!\n");
1981 * Remove a channel from a tunnel.
1984 * @param ch Channel.
1987 GMT_remove_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
1989 struct MeshTChannel *aux;
1991 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
1992 for (aux = t->channel_head; aux != NULL; aux = aux->next)
1996 LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GMCH_2s (ch));
1997 GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
2006 * Search for a channel by global ID.
2008 * @param t Tunnel containing the channel.
2009 * @param chid Public channel number.
2011 * @return channel handler, NULL if doesn't exist
2013 struct MeshChannel *
2014 GMT_get_channel (struct MeshTunnel3 *t, MESH_ChannelNumber chid)
2016 struct MeshTChannel *iter;
2021 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2023 if (GMCH_get_id (iter->ch) == chid)
2027 return NULL == iter ? NULL : iter->ch;
2032 * @brief Destroy a tunnel and free all resources.
2034 * Should only be called a while after the tunnel has been marked as destroyed,
2035 * in case there is a new channel added to the same peer shortly after marking
2036 * the tunnel. This way we avoid a new public key handshake.
2038 * @param cls Closure (tunnel to destroy).
2039 * @param tc Task context.
2042 delayed_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2044 struct MeshTunnel3 *t = cls;
2045 struct MeshTConnection *iter;
2047 t->destroy_task = GNUNET_SCHEDULER_NO_TASK;
2048 t->cstate = MESH_TUNNEL3_SHUTDOWN;
2050 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2052 GMC_send_destroy (iter->c);
2059 * Tunnel is empty: destroy it.
2061 * Notifies all connections about the destruction.
2063 * @param t Tunnel to destroy.
2066 GMT_destroy_empty (struct MeshTunnel3 *t)
2068 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task)
2070 LOG (GNUNET_ERROR_TYPE_DEBUG,
2071 "Tunnel %s is already scheduled for destruction\n",
2074 /* should never happen, tunnel can only become empty once, and the
2075 * task identifier should be NO_TASK (cleaned when the tunnel was created
2076 * or became un-empty)
2081 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s empty: destroying scheduled\n",
2084 t->destroy_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
2085 &delayed_destroy, t);
2090 * Destroy tunnel if empty (no more channels).
2092 * @param t Tunnel to destroy if empty.
2095 GMT_destroy_if_empty (struct MeshTunnel3 *t)
2097 if (1 < GMT_count_channels (t))
2100 GMT_destroy_empty (t);
2105 * Destroy the tunnel.
2107 * This function does not generate any warning traffic to clients or peers.
2110 * Cancel messages belonging to this tunnel queued to neighbors.
2111 * Free any allocated resources linked to the tunnel.
2113 * @param t The tunnel to destroy.
2116 GMT_destroy (struct MeshTunnel3 *t)
2118 struct MeshTConnection *iter_c;
2119 struct MeshTConnection *next_c;
2120 struct MeshTChannel *iter_ch;
2121 struct MeshTChannel *next_ch;
2126 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task)
2128 GNUNET_SCHEDULER_cancel (t->destroy_task);
2129 t->destroy_task = GNUNET_SCHEDULER_NO_TASK;
2132 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GMP_2s (t->peer));
2134 GNUNET_break (GNUNET_YES ==
2135 GNUNET_CONTAINER_multipeermap_remove (tunnels,
2136 GMP_get_id (t->peer), t));
2138 for (iter_c = t->connection_head; NULL != iter_c; iter_c = next_c)
2140 next_c = iter_c->next;
2141 GMC_destroy (iter_c->c);
2143 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = next_ch)
2145 next_ch = iter_ch->next;
2146 GMCH_destroy (iter_ch->ch);
2147 /* Should only happen on shutdown, but it's ok. */
2150 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2151 GMP_set_tunnel (t->peer, NULL);
2153 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
2155 GNUNET_SCHEDULER_cancel (t->rekey_task);
2156 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
2157 if (NULL != t->kx_ctx)
2158 GNUNET_free (t->kx_ctx);
2168 * @brief Use the given path for the tunnel.
2169 * Update the next and prev hops (and RCs).
2170 * (Re)start the path refresh in case the tunnel is locally owned.
2172 * @param t Tunnel to update.
2173 * @param p Path to use.
2175 * @return Connection created.
2177 struct MeshConnection *
2178 GMT_use_path (struct MeshTunnel3 *t, struct MeshPeerPath *p)
2180 struct MeshConnection *c;
2181 struct GNUNET_HashCode cid;
2182 unsigned int own_pos;
2184 if (NULL == t || NULL == p)
2190 if (MESH_TUNNEL3_SHUTDOWN == t->cstate)
2196 for (own_pos = 0; own_pos < p->length; own_pos++)
2198 if (p->peers[own_pos] == myid)
2201 if (own_pos > p->length - 1)
2203 GNUNET_break_op (0);
2207 GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE, &cid);
2208 c = GMC_new (&cid, t, p, own_pos);
2211 /* Path was flawed */
2214 GMT_add_connection (t, c);
2220 * Count established (ready) connections of a tunnel.
2222 * @param t Tunnel on which to count.
2224 * @return Number of connections.
2227 GMT_count_connections (struct MeshTunnel3 *t)
2229 struct MeshTConnection *iter;
2232 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2233 if (MESH_CONNECTION_DESTROYED != GMC_get_state (iter->c))
2240 * Count channels of a tunnel.
2242 * @param t Tunnel on which to count.
2244 * @return Number of channels.
2247 GMT_count_channels (struct MeshTunnel3 *t)
2249 struct MeshTChannel *iter;
2252 for (count = 0, iter = t->channel_head;
2254 iter = iter->next, count++) /* skip */;
2261 * Get the connectivity state of a tunnel.
2265 * @return Tunnel's connectivity state.
2267 enum MeshTunnel3CState
2268 GMT_get_cstate (struct MeshTunnel3 *t)
2273 return (enum MeshTunnel3CState) -1;
2280 * Get the encryption state of a tunnel.
2284 * @return Tunnel's encryption state.
2286 enum MeshTunnel3EState
2287 GMT_get_estate (struct MeshTunnel3 *t)
2292 return (enum MeshTunnel3EState) -1;
2298 * Get the maximum buffer space for a tunnel towards a local client.
2302 * @return Biggest buffer space offered by any channel in the tunnel.
2305 GMT_get_channels_buffer (struct MeshTunnel3 *t)
2307 struct MeshTChannel *iter;
2308 unsigned int buffer;
2309 unsigned int ch_buf;
2311 if (NULL == t->channel_head)
2313 /* Probably getting buffer for a channel create/handshake. */
2318 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2320 ch_buf = get_channel_buffer (iter);
2321 if (ch_buf > buffer)
2329 * Get the total buffer space for a tunnel for P2P traffic.
2333 * @return Buffer space offered by all connections in the tunnel.
2336 GMT_get_connections_buffer (struct MeshTunnel3 *t)
2338 struct MeshTConnection *iter;
2339 unsigned int buffer;
2342 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2344 if (GMC_get_state (iter->c) != MESH_CONNECTION_READY)
2348 buffer += get_connection_buffer (iter);
2356 * Get the tunnel's destination.
2360 * @return ID of the destination peer.
2362 const struct GNUNET_PeerIdentity *
2363 GMT_get_destination (struct MeshTunnel3 *t)
2365 return GMP_get_id (t->peer);
2370 * Get the tunnel's next free global channel ID.
2374 * @return GID of a channel free to use.
2377 GMT_get_next_chid (struct MeshTunnel3 *t)
2379 MESH_ChannelNumber chid;
2380 MESH_ChannelNumber mask;
2383 /* Set bit 30 depending on the ID relationship. Bit 31 is always 0 for GID.
2384 * If our ID is bigger or loopback tunnel, start at 0, bit 30 = 0
2385 * If peer's ID is bigger, start at 0x4... bit 30 = 1
2387 result = GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, GMP_get_id (t->peer));
2393 while (NULL != GMT_get_channel (t, t->next_chid))
2395 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
2396 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
2397 t->next_chid |= mask;
2399 chid = t->next_chid;
2400 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
2401 t->next_chid |= mask;
2408 * Send ACK on one or more channels due to buffer in connections.
2410 * @param t Channel which has some free buffer space.
2413 GMT_unchoke_channels (struct MeshTunnel3 *t)
2415 struct MeshTChannel *iter;
2416 unsigned int buffer;
2417 unsigned int channels = GMT_count_channels (t);
2418 unsigned int choked_n;
2419 struct MeshChannel *choked[channels];
2421 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_unchoke_channels on %s\n", GMT_2s (t));
2422 LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
2423 if (NULL != t->channel_head)
2424 LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
2426 /* Get buffer space */
2427 buffer = GMT_get_connections_buffer (t);
2433 /* Count and remember choked channels */
2435 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2437 if (GNUNET_NO == get_channel_allowed (iter))
2439 choked[choked_n++] = iter->ch;
2443 /* Unchoke random channels */
2444 while (0 < buffer && 0 < choked_n)
2446 unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2448 GMCH_allow_client (choked[r], GMCH_is_origin (choked[r], GNUNET_YES));
2451 choked[r] = choked[choked_n];
2457 * Send ACK on one or more connections due to buffer space to the client.
2459 * Iterates all connections of the tunnel and sends ACKs appropriately.
2464 GMT_send_connection_acks (struct MeshTunnel3 *t)
2466 struct MeshTConnection *iter;
2469 uint32_t allow_per_connection;
2471 unsigned int buffer;
2473 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel send connection ACKs on %s\n",
2482 buffer = GMT_get_channels_buffer (t);
2483 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer %u\n", buffer);
2485 /* Count connections, how many messages are already allowed */
2486 cs = GMT_count_connections (t);
2487 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2489 allowed += get_connection_allowed (iter);
2491 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowed %u\n", allowed);
2493 /* Make sure there is no overflow */
2494 if (allowed > buffer)
2499 /* Authorize connections to send more data */
2500 to_allow = buffer; /* - allowed; */
2502 for (iter = t->connection_head;
2503 NULL != iter && to_allow > 0;
2506 allow_per_connection = to_allow/cs;
2507 to_allow -= allow_per_connection;
2509 if (get_connection_allowed (iter) > 64 / 3)
2513 GMC_allow (iter->c, allow_per_connection,
2514 GMC_is_origin (iter->c, GNUNET_NO));
2517 GNUNET_break (to_allow == 0);
2522 * Cancel a previously sent message while it's in the queue.
2524 * ONLY can be called before the continuation given to the send function
2525 * is called. Once the continuation is called, the message is no longer in the
2528 * @param q Handle to the queue.
2531 GMT_cancel (struct MeshTunnel3Queue *q)
2536 /* message_sent() will be called and free q */
2538 else if (NULL != q->tqd)
2540 unqueue_data (q->tqd);
2542 if (NULL != q->cont)
2543 q->cont (q->cont_cls, NULL, q, 0, 0);
2554 * Sends an already built message on a tunnel, encrypting it and
2555 * choosing the best connection if not provided.
2557 * @param message Message to send. Function modifies it.
2558 * @param t Tunnel on which this message is transmitted.
2559 * @param c Connection to use (autoselect if NULL).
2560 * @param force Force the tunnel to take the message (buffer overfill).
2561 * @param cont Continuation to call once message is really sent.
2562 * @param cont_cls Closure for @c cont.
2564 * @return Handle to cancel message. NULL if @c cont is NULL.
2566 struct MeshTunnel3Queue *
2567 GMT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2568 struct MeshTunnel3 *t, struct MeshConnection *c,
2569 int force, GMT_sent cont, void *cont_cls)
2571 return send_prebuilt_message (message, t, c, force, cont, cont_cls, NULL);
2576 * Is the tunnel directed towards the local peer?
2580 * @return #GNUNET_YES if it is loopback.
2583 GMT_is_loopback (const struct MeshTunnel3 *t)
2585 return (myid == GMP_get_short_id (t->peer));
2590 * Is the tunnel this path already?
2595 * @return #GNUNET_YES a connection uses this path.
2598 GMT_is_path_used (const struct MeshTunnel3 *t, const struct MeshPeerPath *p)
2600 struct MeshTConnection *iter;
2602 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2603 if (GMC_get_path (iter->c) == p)
2611 * Get a cost of a path for a tunnel considering existing connections.
2614 * @param path Candidate path.
2616 * @return Cost of the path (path length + number of overlapping nodes)
2619 GMT_get_path_cost (const struct MeshTunnel3 *t,
2620 const struct MeshPeerPath *path)
2622 struct MeshTConnection *iter;
2623 const struct MeshPeerPath *aux;
2624 unsigned int overlap;
2632 GNUNET_assert (NULL != t);
2634 for (i = 0; i < path->length; i++)
2636 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2638 aux = GMC_get_path (iter->c);
2642 for (j = 0; j < aux->length; j++)
2644 if (path->peers[i] == aux->peers[j])
2652 return (path->length + overlap) * (path->score * -1);
2657 * Get the static string for the peer this tunnel is directed.
2661 * @return Static string the destination peer's ID.
2664 GMT_2s (const struct MeshTunnel3 *t)
2669 return GMP_2s (t->peer);
2673 /******************************************************************************/
2674 /***************************** INFO/DEBUG *******************************/
2675 /******************************************************************************/
2679 * Log all possible info about the tunnel state to stderr.
2681 * @param t Tunnel to debug.
2684 GMT_debug (const struct MeshTunnel3 *t)
2686 struct MeshTChannel *iterch;
2687 struct MeshTConnection *iterc;
2689 LOG (GNUNET_ERROR_TYPE_DEBUG, "DEBUG TUNNEL TOWARDS %s\n", GMT_2s (t));
2690 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate %s, estate %s\n",
2691 cstate2s (t->cstate), estate2s (t->estate));
2692 LOG (GNUNET_ERROR_TYPE_DEBUG, " kx_ctx %p, rekey_task %u\n",
2693 t->kx_ctx, t->rekey_task);
2694 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq_head %p, tq_tail %p\n",
2695 t->tq_head, t->tq_tail);
2696 LOG (GNUNET_ERROR_TYPE_DEBUG, " destroy %u\n", t->destroy_task);
2698 LOG (GNUNET_ERROR_TYPE_DEBUG, " channels:\n");
2699 for (iterch = t->channel_head; NULL != iterch; iterch = iterch->next)
2701 LOG (GNUNET_ERROR_TYPE_DEBUG, " - %s\n", GMCH_2s (iterch->ch));
2704 LOG (GNUNET_ERROR_TYPE_DEBUG, " connections:\n");
2705 for (iterc = t->connection_head; NULL != iterc; iterc = iterc->next)
2707 LOG (GNUNET_ERROR_TYPE_DEBUG, " - %s [%u] buf: %u/%u (qn %u/%u)\n",
2708 GMC_2s (iterc->c), GMC_get_state (iterc->c),
2709 GMC_get_buffer (iterc->c, GNUNET_YES),
2710 GMC_get_buffer (iterc->c, GNUNET_NO),
2711 GMC_get_qn (iterc->c, GNUNET_YES),
2712 GMC_get_qn (iterc->c, GNUNET_NO));
2715 LOG (GNUNET_ERROR_TYPE_DEBUG, "DEBUG TUNNEL END\n");
2720 * Iterate all tunnels.
2722 * @param iter Iterator.
2723 * @param cls Closure for @c iter.
2726 GMT_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter, void *cls)
2728 GNUNET_CONTAINER_multipeermap_iterate (tunnels, iter, cls);
2733 * Count all tunnels.
2735 * @return Number of tunnels to remote peers kept by this peer.
2738 GMT_count_all (void)
2740 return GNUNET_CONTAINER_multipeermap_size (tunnels);
2745 * Iterate all connections of a tunnel.
2747 * @param t Tunnel whose connections to iterate.
2748 * @param iter Iterator.
2749 * @param cls Closure for @c iter.
2752 GMT_iterate_connections (struct MeshTunnel3 *t, GMT_conn_iter iter, void *cls)
2754 struct MeshTConnection *ct;
2756 for (ct = t->connection_head; NULL != ct; ct = ct->next)
2762 * Iterate all channels of a tunnel.
2764 * @param t Tunnel whose channels to iterate.
2765 * @param iter Iterator.
2766 * @param cls Closure for @c iter.
2769 GMT_iterate_channels (struct MeshTunnel3 *t, GMT_chan_iter iter, void *cls)
2771 struct MeshTChannel *cht;
2773 for (cht = t->channel_head; NULL != cht; cht = cht->next)
2774 iter (cls, cht->ch);