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.
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 MeshChannel *ch;
168 /* struct GNUNET_MessageHeader *msg; */
173 * Handle for messages queued but not yet sent.
175 struct MeshTunnel3Queue
178 * Connection queue handle, to cancel if necessary.
180 struct MeshConnectionQueue *q;
183 * Continuation to call once sent.
188 * Closure for @c cont.
194 /******************************************************************************/
195 /******************************* GLOBALS ***********************************/
196 /******************************************************************************/
199 * Global handle to the statistics service.
201 extern struct GNUNET_STATISTICS_Handle *stats;
204 * Local peer own ID (memory efficient handle).
206 extern GNUNET_PEER_Id myid;
209 * Local peer own ID (full value).
211 extern struct GNUNET_PeerIdentity my_full_id;
215 * Set of all tunnels, in order to trigger a new exchange on rekey.
216 * Indexed by peer's ID.
218 static struct GNUNET_CONTAINER_MultiPeerMap *tunnels;
221 * Default TTL for payload packets.
223 static unsigned long long default_ttl;
228 const static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
231 * Own ephemeral private key.
233 static struct GNUNET_CRYPTO_EcdhePrivateKey *my_ephemeral_key;
236 * Cached message used to perform a key exchange.
238 static struct GNUNET_MESH_KX_Ephemeral kx_msg;
241 * Task to generate a new ephemeral key.
243 static GNUNET_SCHEDULER_TaskIdentifier rekey_task;
248 static struct GNUNET_TIME_Relative rekey_period;
250 /******************************************************************************/
251 /******************************** STATIC ***********************************/
252 /******************************************************************************/
255 * Get string description for tunnel connectivity state.
257 * @param cs Tunnel state.
259 * @return String representation.
262 cstate2s (enum MeshTunnel3CState cs)
264 static char buf[128];
268 case MESH_TUNNEL3_NEW:
269 return "MESH_TUNNEL3_NEW";
270 case MESH_TUNNEL3_SEARCHING:
271 return "MESH_TUNNEL3_SEARCHING";
272 case MESH_TUNNEL3_WAITING:
273 return "MESH_TUNNEL3_WAITING";
274 case MESH_TUNNEL3_READY:
275 return "MESH_TUNNEL3_READY";
278 sprintf (buf, "%u (UNKNOWN STATE)", cs);
286 * Get string description for tunnel encryption state.
288 * @param es Tunnel state.
290 * @return String representation.
293 estate2s (enum MeshTunnel3EState es)
295 static char buf[128];
299 case MESH_TUNNEL3_KEY_UNINITIALIZED:
300 return "MESH_TUNNEL3_KEY_UNINITIALIZED";
301 case MESH_TUNNEL3_KEY_SENT:
302 return "MESH_TUNNEL3_KEY_SENT";
303 case MESH_TUNNEL3_KEY_PING:
304 return "MESH_TUNNEL3_KEY_PING";
305 case MESH_TUNNEL3_KEY_OK:
306 return "MESH_TUNNEL3_KEY_OK";
309 sprintf (buf, "%u (UNKNOWN STATE)", es);
317 * @brief Check if tunnel is ready to send traffic.
319 * Tunnel must be connected and with encryption correctly set up.
321 * @param t Tunnel to check.
323 * @return #GNUNET_YES if ready, #GNUNET_NO otherwise
326 is_ready (struct MeshTunnel3 *t)
328 return (MESH_TUNNEL3_READY == t->cstate
329 && MESH_TUNNEL3_KEY_OK == t->estate)
330 || GMT_is_loopback (t);
335 * Ephemeral key message purpose size.
337 * @return Size of the part of the ephemeral key message that must be signed.
340 ephemeral_purpose_size (void)
342 return sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
343 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
344 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
345 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
346 sizeof (struct GNUNET_PeerIdentity);
351 * Size of the encrypted part of a ping message.
353 * @return Size of the encrypted part of a ping message.
356 ping_encryption_size (void)
358 return sizeof (struct GNUNET_PeerIdentity) + sizeof (uint32_t);
363 * Get the channel's buffer. ONLY FOR NON-LOOPBACK CHANNELS!!
365 * @param tch Tunnel's channel handle.
367 * @return Amount of messages the channel can still buffer towards the client.
370 get_channel_buffer (const struct MeshTChannel *tch)
374 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
375 fwd = GMCH_is_origin (tch->ch, GNUNET_YES);
377 return GMCH_get_buffer (tch->ch, fwd);
382 * Get the channel's allowance status.
384 * @param tch Tunnel's channel handle.
386 * @return #GNUNET_YES if we allowed the client to send data to us.
389 get_channel_allowed (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_allowed (tch->ch, fwd);
401 * Get the connection's buffer.
403 * @param tc Tunnel's connection handle.
405 * @return Amount of messages the connection can still buffer.
408 get_connection_buffer (const struct MeshTConnection *tc)
412 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
413 fwd = GMC_is_origin (tc->c, GNUNET_YES);
415 return GMC_get_buffer (tc->c, fwd);
420 * Get the connection's allowance.
422 * @param tc Tunnel's connection handle.
424 * @return Amount of messages we have allowed the next peer to send us.
427 get_connection_allowed (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_allowed (tc->c, fwd);
439 * Check that a ephemeral key message s well formed and correctly signed.
441 * @param t Tunnel on which the message came.
442 * @param msg The ephemeral key message.
444 * @return GNUNET_OK if message is fine, GNUNET_SYSERR otherwise.
447 check_ephemeral (struct MeshTunnel3 *t,
448 const struct GNUNET_MESH_KX_Ephemeral *msg)
450 /* Check message size */
451 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_KX_Ephemeral))
452 return GNUNET_SYSERR;
454 /* Check signature size */
455 if (ntohl (msg->purpose.size) != ephemeral_purpose_size ())
456 return GNUNET_SYSERR;
459 if (0 != memcmp (&msg->origin_identity,
460 GMP_get_id (t->peer),
461 sizeof (struct GNUNET_PeerIdentity)))
462 return GNUNET_SYSERR;
464 /* Check signature */
466 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_MESH_KX,
469 &msg->origin_identity.public_key))
470 return GNUNET_SYSERR;
477 * Encrypt data with the tunnel key.
479 * @param t Tunnel whose key to use.
480 * @param dst Destination for the encrypted data.
481 * @param src Source of the plaintext. Can overlap with @c dst.
482 * @param size Size of the plaintext.
483 * @param iv Initialization Vector to use.
486 t_encrypt (struct MeshTunnel3 *t,
487 void *dst, const void *src,
488 size_t size, uint32_t iv)
490 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
492 GNUNET_CRYPTO_symmetric_derive_iv (&siv, &t->e_key, &iv, sizeof (uint32_t), NULL);
493 return GNUNET_CRYPTO_symmetric_encrypt (src, size, &t->e_key, &siv, dst);
498 * Decrypt data with the tunnel key.
500 * @param t Tunnel whose key to use.
501 * @param dst Destination for the plaintext.
502 * @param src Source of the encrypted data. Can overlap with @c dst.
503 * @param size Size of the encrypted data.
504 * @param iv Initialization Vector to use.
507 t_decrypt (struct MeshTunnel3 *t,
508 void *dst, const void *src,
509 size_t size, uint32_t iv)
511 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
513 GNUNET_CRYPTO_symmetric_derive_iv (&siv, &t->d_key, &iv, sizeof (uint32_t), NULL);
514 return GNUNET_CRYPTO_symmetric_decrypt (src, size, &t->d_key, &siv, dst);
519 * Create key material by doing ECDH on the local and remote ephemeral keys.
521 * @param key_material Where to store the key material.
522 * @param ephemeral_key Peer's public ephemeral key.
525 derive_key_material (struct GNUNET_HashCode *key_material,
526 const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key)
529 GNUNET_CRYPTO_ecc_ecdh (my_ephemeral_key,
538 * Create a symmetic key from the identities of both ends and the key material
541 * @param key Destination for the generated key.
542 * @param sender ID of the peer that will encrypt with @c key.
543 * @param receiver ID of the peer that will decrypt with @c key.
544 * @param key_material Hash created with ECDH with the ephemeral keys.
547 derive_symmertic (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
548 const struct GNUNET_PeerIdentity *sender,
549 const struct GNUNET_PeerIdentity *receiver,
550 const struct GNUNET_HashCode *key_material)
552 const char salt[] = "MESH kx salt";
554 GNUNET_CRYPTO_kdf (key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
556 key_material, sizeof (struct GNUNET_HashCode),
557 sender, sizeof (struct GNUNET_PeerIdentity),
558 receiver, sizeof (struct GNUNET_PeerIdentity),
563 * Pick a connection on which send the next data message.
565 * @param t Tunnel on which to send the message.
567 * @return The connection on which to send the next message.
569 static struct MeshConnection *
570 tunnel_get_connection (struct MeshTunnel3 *t)
572 struct MeshTConnection *iter;
573 struct MeshConnection *best;
575 unsigned int lowest_q;
577 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GMP_2s (t->peer));
580 for (iter = t->connection_head; NULL != iter; iter = iter->next)
582 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
583 GMC_2s (iter->c), GMC_get_state (iter->c));
584 if (MESH_CONNECTION_READY == GMC_get_state (iter->c))
586 qn = GMC_get_qn (iter->c, GMC_is_origin (iter->c, GNUNET_YES));
587 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
595 LOG (GNUNET_ERROR_TYPE_DEBUG, " selected: connection %s\n", GMC_2s (best));
601 * Send all cached messages that we can, tunnel is online.
603 * @param t Tunnel that holds the messages. Cannot be loopback.
606 send_queued_data (struct MeshTunnel3 *t)
608 struct MeshTunnelDelayed *tq;
609 struct MeshTunnelDelayed *next;
612 LOG (GNUNET_ERROR_TYPE_DEBUG,
613 "GMT_send_queued_data on tunnel %s\n",
616 if (GMT_is_loopback (t))
622 if (GNUNET_NO == is_ready (t))
624 LOG (GNUNET_ERROR_TYPE_DEBUG, " not ready yet: %s/%s\n",
625 estate2s (t->estate), cstate2s (t->cstate));
629 room = GMT_get_connections_buffer (t);
630 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
631 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq head: %p\n", t->tq_head);
632 for (tq = t->tq_head; NULL != tq && room > 0; tq = next)
634 LOG (GNUNET_ERROR_TYPE_DEBUG, " data on channel %s\n", GMCH_2s (tq->ch));
637 GNUNET_CONTAINER_DLL_remove (t->tq_head, t->tq_tail, tq);
638 GMCH_send_prebuilt_message ((struct GNUNET_MessageHeader *) &tq[1],
639 tq->ch, GMCH_is_origin (tq->ch, GNUNET_YES),
644 LOG (GNUNET_ERROR_TYPE_DEBUG,
645 "GMT_send_queued_data end\n",
653 * Cache a message to be sent once tunnel is online.
655 * @param t Tunnel to hold the message.
656 * @param ch Channel the message is about.
657 * @param msg Message itself (copy will be made).
660 queue_data (struct MeshTunnel3 *t,
661 struct MeshChannel *ch,
662 const struct GNUNET_MessageHeader *msg)
664 struct MeshTunnelDelayed *tq;
665 uint16_t size = ntohs (msg->size);
667 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue data on Tunnel %s\n", GMT_2s (t));
669 if (GNUNET_YES == is_ready (t))
675 tq = GNUNET_malloc (sizeof (struct MeshTunnelDelayed) + size);
678 memcpy (&tq[1], msg, size);
679 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tq);
685 * Sends key exchange message on a tunnel, choosing the best connection.
686 * Should not be called on loopback tunnels.
688 * @param t Tunnel on which this message is transmitted.
689 * @param message Message to send. Function modifies it.
692 send_kx (struct MeshTunnel3 *t,
693 const struct GNUNET_MessageHeader *message)
695 struct MeshConnection *c;
696 struct GNUNET_MESH_KX *msg;
697 size_t size = ntohs (message->size);
698 char cbuf[sizeof (struct GNUNET_MESH_KX) + size];
702 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT KX on Tunnel %s\n", GMT_2s (t));
704 /* Avoid loopback. */
705 if (GMT_is_loopback (t))
707 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback!\n");
712 /* Must have a connection. */
713 if (NULL == t->connection_head)
719 msg = (struct GNUNET_MESH_KX *) cbuf;
720 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX);
721 msg->header.size = htons (sizeof (struct GNUNET_MESH_KX) + size);
722 c = tunnel_get_connection (t);
725 GNUNET_break (GNUNET_YES == t->destroy);
728 type = ntohs (message->type);
731 case GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL:
732 case GNUNET_MESSAGE_TYPE_MESH_KX_PING:
733 case GNUNET_MESSAGE_TYPE_MESH_KX_PONG:
734 msg->reserved = htonl (0);
735 memcpy (&msg[1], message, size);
738 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
743 fwd = GMC_is_origin (t->connection_head->c, GNUNET_YES);
744 /* TODO save handle and cancel in case of a unneeded retransmission */
745 GMC_send_prebuilt_message (&msg->header, c, fwd, GNUNET_YES, NULL, NULL);
750 * Send the ephemeral key on a tunnel.
752 * @param t Tunnel on which to send the key.
755 send_ephemeral (struct MeshTunnel3 *t)
757 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __FUNCTION__);
759 kx_msg.sender_status = htonl (t->estate);
760 send_kx (t, &kx_msg.header);
764 * Send a ping message on a tunnel.
766 * @param t Tunnel on which to send the ping.
769 send_ping (struct MeshTunnel3 *t)
771 struct GNUNET_MESH_KX_Ping msg;
773 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __FUNCTION__);
774 msg.header.size = htons (sizeof (msg));
775 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_PING);
776 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
777 msg.target = *GMP_get_id (t->peer);
778 msg.nonce = t->kx_ctx->challenge;
780 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
781 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&msg.target));
782 t_encrypt (t, &msg.target, &msg.target, ping_encryption_size(), msg.iv);
783 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
784 LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg.target));
786 send_kx (t, &msg.header);
791 * Send a pong message on a tunnel.
793 * @param t Tunnel on which to send the pong.
794 * @param challenge Value sent in the ping that we have to send back.
797 send_pong (struct MeshTunnel3 *t, uint32_t challenge)
799 struct GNUNET_MESH_KX_Pong msg;
801 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __FUNCTION__);
802 msg.header.size = htons (sizeof (msg));
803 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_PONG);
804 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
805 msg.nonce = challenge;
806 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
807 t_encrypt (t, &msg.nonce, &msg.nonce, sizeof (msg.nonce), msg.iv);
808 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
810 send_kx (t, &msg.header);
815 * Initiate a rekey with the remote peer.
817 * @param cls Closure (tunnel).
818 * @param tc TaskContext.
821 rekey_tunnel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
823 struct MeshTunnel3 *t = cls;
825 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
827 LOG (GNUNET_ERROR_TYPE_DEBUG, "Re-key Tunnel\n");
828 if (NULL != tc && 0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
831 if (NULL == t->kx_ctx)
833 LOG (GNUNET_ERROR_TYPE_DEBUG, " new kx ctx\n");
834 t->kx_ctx = GNUNET_new (struct MeshTunnelKXCtx);
835 t->kx_ctx->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
837 t->kx_ctx->d_key_old = t->d_key;
842 case MESH_TUNNEL3_KEY_UNINITIALIZED:
843 t->estate = MESH_TUNNEL3_KEY_SENT;
845 case MESH_TUNNEL3_KEY_SENT:
847 case MESH_TUNNEL3_KEY_PING:
848 case MESH_TUNNEL3_KEY_OK:
850 t->estate = MESH_TUNNEL3_KEY_PING;
853 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unexpected state %u\n", t->estate);
856 LOG (GNUNET_ERROR_TYPE_DEBUG, " next call in %s\n",
857 GNUNET_STRINGS_relative_time_to_string (REKEY_WAIT, GNUNET_YES));
858 t->rekey_task = GNUNET_SCHEDULER_add_delayed (REKEY_WAIT, &rekey_tunnel, t);
863 * Out ephemeral key has changed, create new session key on all tunnels.
865 * @param cls Closure (size of the hashmap).
866 * @param key Current public key.
867 * @param value Value in the hash map (tunnel).
869 * @return #GNUNET_YES, so we should continue to iterate,
872 rekey_iterator (void *cls,
873 const struct GNUNET_PeerIdentity *key,
876 struct MeshTunnel3 *t = value;
877 struct GNUNET_TIME_Relative delay;
881 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
884 r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, (uint32_t) n * 100);
885 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, r);
886 t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
893 * Create a new ephemeral key and key message, schedule next rekeying.
895 * @param cls Closure (unused).
896 * @param tc TaskContext.
899 rekey (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
901 struct GNUNET_TIME_Absolute time;
904 rekey_task = GNUNET_SCHEDULER_NO_TASK;
906 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
909 GNUNET_free_non_null (my_ephemeral_key);
910 my_ephemeral_key = GNUNET_CRYPTO_ecdhe_key_create ();
912 time = GNUNET_TIME_absolute_get ();
913 kx_msg.creation_time = GNUNET_TIME_absolute_hton (time);
914 time = GNUNET_TIME_absolute_add (time, rekey_period);
915 time = GNUNET_TIME_absolute_add (time, GNUNET_TIME_UNIT_MINUTES);
916 kx_msg.expiration_time = GNUNET_TIME_absolute_hton (time);
917 GNUNET_CRYPTO_ecdhe_key_get_public (my_ephemeral_key, &kx_msg.ephemeral_key);
919 GNUNET_assert (GNUNET_OK ==
920 GNUNET_CRYPTO_eddsa_sign (my_private_key,
924 n = (long) GNUNET_CONTAINER_multipeermap_size (tunnels);
925 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &rekey_iterator, (void *) n);
927 rekey_task = GNUNET_SCHEDULER_add_delayed (rekey_period, &rekey, NULL);
932 * Called only on shutdown, destroy every tunnel.
934 * @param cls Closure (unused).
935 * @param key Current public key.
936 * @param value Value in the hash map (tunnel).
938 * @return #GNUNET_YES, so we should continue to iterate,
941 destroy_iterator (void *cls,
942 const struct GNUNET_PeerIdentity *key,
945 struct MeshTunnel3 *t = value;
953 * Demultiplex data per channel and call appropriate channel handler.
955 * @param t Tunnel on which the data came.
956 * @param msg Data message.
957 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
958 * #GNUNET_YES if message is FWD on the respective channel (loopback)
959 * #GNUNET_NO if message is BCK on the respective channel (loopback)
960 * #GNUNET_SYSERR if message on a one-ended channel (remote)
963 handle_data (struct MeshTunnel3 *t,
964 const struct GNUNET_MESH_Data *msg,
967 struct MeshChannel *ch;
971 size = ntohs (msg->header.size);
973 sizeof (struct GNUNET_MESH_Data) +
974 sizeof (struct GNUNET_MessageHeader))
979 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
980 GM_m2s (ntohs (msg[1].header.type)));
983 ch = GMT_get_channel (t, ntohl (msg->chid));
986 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
988 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
993 GMCH_handle_data (ch, msg, fwd);
998 * Demultiplex data ACKs per channel and update appropriate channel buffer info.
1000 * @param t Tunnel on which the DATA ACK came.
1001 * @param msg DATA ACK message.
1002 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1003 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1004 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1005 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1008 handle_data_ack (struct MeshTunnel3 *t,
1009 const struct GNUNET_MESH_DataACK *msg,
1012 struct MeshChannel *ch;
1016 size = ntohs (msg->header.size);
1017 if (size != sizeof (struct GNUNET_MESH_DataACK))
1024 ch = GMT_get_channel (t, ntohl (msg->chid));
1027 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
1029 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1034 GMCH_handle_data_ack (ch, msg, fwd);
1039 * Handle channel create.
1041 * @param t Tunnel on which the data came.
1042 * @param msg Data message.
1045 handle_ch_create (struct MeshTunnel3 *t,
1046 const struct GNUNET_MESH_ChannelCreate *msg)
1048 struct MeshChannel *ch;
1052 size = ntohs (msg->header.size);
1053 if (size != sizeof (struct GNUNET_MESH_ChannelCreate))
1060 ch = GMT_get_channel (t, ntohl (msg->chid));
1061 if (NULL != ch && ! GMT_is_loopback (t))
1063 /* Probably a retransmission, safe to ignore */
1064 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
1068 ch = GMCH_handle_create (t, msg);
1071 GMT_add_channel (t, ch);
1077 * Handle channel NACK: check correctness and call channel handler for NACKs.
1079 * @param t Tunnel on which the NACK came.
1080 * @param msg NACK message.
1083 handle_ch_nack (struct MeshTunnel3 *t,
1084 const struct GNUNET_MESH_ChannelManage *msg)
1086 struct MeshChannel *ch;
1090 size = ntohs (msg->header.size);
1091 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1098 ch = GMT_get_channel (t, ntohl (msg->chid));
1101 GNUNET_STATISTICS_update (stats, "# channel NACK on unknown channel",
1103 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1108 GMCH_handle_nack (ch);
1113 * Handle a CHANNEL ACK (SYNACK/ACK).
1115 * @param t Tunnel on which the CHANNEL ACK came.
1116 * @param msg CHANNEL ACK message.
1117 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1118 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1119 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1120 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1123 handle_ch_ack (struct MeshTunnel3 *t,
1124 const struct GNUNET_MESH_ChannelManage *msg,
1127 struct MeshChannel *ch;
1131 size = ntohs (msg->header.size);
1132 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1139 ch = GMT_get_channel (t, ntohl (msg->chid));
1142 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
1144 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1149 GMCH_handle_ack (ch, msg, fwd);
1155 * Handle a channel destruction message.
1157 * @param t Tunnel on which the message came.
1158 * @param msg Channel destroy message.
1159 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1160 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1161 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1162 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1165 handle_ch_destroy (struct MeshTunnel3 *t,
1166 const struct GNUNET_MESH_ChannelManage *msg,
1169 struct MeshChannel *ch;
1173 size = ntohs (msg->header.size);
1174 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1181 ch = GMT_get_channel (t, ntohl (msg->chid));
1184 /* Probably a retransmission, safe to ignore */
1188 GMCH_handle_destroy (ch, msg, fwd);
1193 * The peer's ephemeral key has changed: update the symmetrical keys.
1195 * @param t Tunnel this message came on.
1196 * @param msg Key eXchange message.
1199 handle_ephemeral (struct MeshTunnel3 *t,
1200 const struct GNUNET_MESH_KX_Ephemeral *msg)
1202 struct GNUNET_HashCode km;
1203 LOG (GNUNET_ERROR_TYPE_DEBUG, " ephemeral key message\n");
1205 if (GNUNET_OK != check_ephemeral (t, msg))
1207 GNUNET_break_op (0);
1210 derive_key_material (&km, &msg->ephemeral_key);
1211 LOG (GNUNET_ERROR_TYPE_DEBUG, " km is %s\n", GNUNET_h2s (&km));
1212 derive_symmertic (&t->e_key, &my_full_id, GMP_get_id (t->peer), &km);
1213 derive_symmertic (&t->d_key, GMP_get_id (t->peer), &my_full_id, &km);
1214 if (MESH_TUNNEL3_KEY_SENT == t->estate)
1216 LOG (GNUNET_ERROR_TYPE_DEBUG, " our key was sent, send ping\n");
1218 t->estate = MESH_TUNNEL3_KEY_PING;
1224 * Peer wants to check our symmetrical keys by sending an encrypted challenge.
1225 * Answer with by retransmitting the challenge with the "opposite" key.
1227 * @param t Tunnel this message came on.
1228 * @param msg Key eXchange Ping message.
1231 handle_ping (struct MeshTunnel3 *t,
1232 const struct GNUNET_MESH_KX_Ping *msg)
1234 struct GNUNET_MESH_KX_Ping res;
1236 if (ntohs (msg->header.size) != sizeof (res))
1238 GNUNET_break_op (0);
1242 LOG (GNUNET_ERROR_TYPE_DEBUG, " ping message\n");
1243 t_decrypt (t, &res.target, &msg->target, ping_encryption_size (), msg->iv);
1244 if (0 != memcmp (&my_full_id, &res.target, sizeof (my_full_id)))
1246 GNUNET_break_op (0);
1247 LOG (GNUNET_ERROR_TYPE_DEBUG, " e got %u\n", msg->nonce);
1248 LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg->target));
1249 LOG (GNUNET_ERROR_TYPE_DEBUG, " got %u\n", res.nonce);
1250 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&res.target));
1254 send_pong (t, res.nonce);
1259 * Peer has answer to our challenge.
1260 * If answer is successful, consider the key exchange finished and clean
1261 * up all related state.
1263 * @param t Tunnel this message came on.
1264 * @param msg Key eXchange Pong message.
1267 handle_pong (struct MeshTunnel3 *t,
1268 const struct GNUNET_MESH_KX_Pong *msg)
1272 LOG (GNUNET_ERROR_TYPE_DEBUG, "PONG received\n");
1273 if (GNUNET_SCHEDULER_NO_TASK == t->rekey_task)
1275 GNUNET_break_op (0);
1278 t_decrypt (t, &challenge, &msg->nonce, sizeof (uint32_t), msg->iv);
1280 if (challenge != t->kx_ctx->challenge)
1282 LOG (GNUNET_ERROR_TYPE_DEBUG,
1283 "Wrong PONG challenge: %u (e: %u). Expected: %u.\n",
1284 challenge, msg->nonce, t->kx_ctx->challenge);
1285 GNUNET_break_op (0);
1288 GNUNET_SCHEDULER_cancel (t->rekey_task);
1289 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
1290 GNUNET_free (t->kx_ctx);
1292 GMT_change_estate (t, MESH_TUNNEL3_KEY_OK);
1297 * Demultiplex by message type and call appropriate handler for a message
1298 * towards a channel of a local tunnel.
1300 * @param t Tunnel this message came on.
1301 * @param msgh Message header.
1302 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1303 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1304 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1305 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1308 handle_decrypted (struct MeshTunnel3 *t,
1309 const struct GNUNET_MessageHeader *msgh,
1314 type = ntohs (msgh->type);
1315 LOG (GNUNET_ERROR_TYPE_DEBUG,
1316 "Got a %s message!\n",
1321 case GNUNET_MESSAGE_TYPE_MESH_DATA:
1322 /* Don't send hop ACK, wait for client to ACK */
1323 handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
1326 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
1327 handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
1330 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1331 handle_ch_create (t,
1332 (struct GNUNET_MESH_ChannelCreate *) msgh);
1335 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK:
1337 (struct GNUNET_MESH_ChannelManage *) msgh);
1340 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
1342 (struct GNUNET_MESH_ChannelManage *) msgh,
1346 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1347 handle_ch_destroy (t,
1348 (struct GNUNET_MESH_ChannelManage *) msgh,
1353 GNUNET_break_op (0);
1354 LOG (GNUNET_ERROR_TYPE_DEBUG,
1355 "end-to-end message not known (%u)\n",
1356 ntohs (msgh->type));
1360 /******************************************************************************/
1361 /******************************** API ***********************************/
1362 /******************************************************************************/
1365 * Decrypt and demultiplex by message type. Call appropriate handler
1366 * for every message.
1368 * @param t Tunnel this message came on.
1369 * @param msg Encrypted message.
1372 GMT_handle_encrypted (struct MeshTunnel3 *t,
1373 const struct GNUNET_MESH_Encrypted *msg)
1375 size_t size = ntohs (msg->header.size);
1376 size_t payload_size = size - sizeof (struct GNUNET_MESH_Encrypted);
1377 size_t decrypted_size;
1378 char cbuf [payload_size];
1379 struct GNUNET_MessageHeader *msgh;
1382 decrypted_size = t_decrypt (t, cbuf, &msg[1], payload_size, msg->iv);
1384 while (off < decrypted_size)
1386 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
1387 handle_decrypted (t, msgh, GNUNET_SYSERR);
1388 off += ntohs (msgh->size);
1394 * Demultiplex an encapsulated KX message by message type.
1396 * @param t Tunnel on which the message came.
1397 * @param message Payload of KX message.
1400 GMT_handle_kx (struct MeshTunnel3 *t,
1401 const struct GNUNET_MessageHeader *message)
1405 type = ntohs (message->type);
1406 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message received\n", type);
1409 case GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL:
1410 handle_ephemeral (t, (struct GNUNET_MESH_KX_Ephemeral *) message);
1413 case GNUNET_MESSAGE_TYPE_MESH_KX_PING:
1414 handle_ping (t, (struct GNUNET_MESH_KX_Ping *) message);
1417 case GNUNET_MESSAGE_TYPE_MESH_KX_PONG:
1418 handle_pong (t, (struct GNUNET_MESH_KX_Pong *) message);
1422 GNUNET_break_op (0);
1423 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message not known (%u)\n", type);
1429 * Initialize the tunnel subsystem.
1431 * @param c Configuration handle.
1432 * @param key ECC private key, to derive all other keys and do crypto.
1435 GMT_init (const struct GNUNET_CONFIGURATION_Handle *c,
1436 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
1438 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
1440 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
1443 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1444 "MESH", "DEFAULT_TTL", "USING DEFAULT");
1448 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REKEY_PERIOD",
1451 rekey_period = GNUNET_TIME_UNIT_DAYS;
1454 my_private_key = key;
1455 kx_msg.header.size = htons (sizeof (kx_msg));
1456 kx_msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL);
1457 kx_msg.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_MESH_KX);
1458 kx_msg.purpose.size = htonl (ephemeral_purpose_size ());
1459 kx_msg.origin_identity = my_full_id;
1460 rekey_task = GNUNET_SCHEDULER_add_now (&rekey, NULL);
1462 tunnels = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1467 * Shut down the tunnel subsystem.
1472 if (GNUNET_SCHEDULER_NO_TASK != rekey_task)
1474 GNUNET_SCHEDULER_cancel (rekey_task);
1475 rekey_task = GNUNET_SCHEDULER_NO_TASK;
1477 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &destroy_iterator, NULL);
1478 GNUNET_CONTAINER_multipeermap_destroy (tunnels);
1485 * @param destination Peer this tunnel is towards.
1487 struct MeshTunnel3 *
1488 GMT_new (struct MeshPeer *destination)
1490 struct MeshTunnel3 *t;
1492 t = GNUNET_new (struct MeshTunnel3);
1494 t->peer = destination;
1497 GNUNET_CONTAINER_multipeermap_put (tunnels, GMP_get_id (destination), t,
1498 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1509 * Change the tunnel's connection state.
1511 * @param t Tunnel whose connection state to change.
1512 * @param cstate New connection state.
1515 GMT_change_cstate (struct MeshTunnel3* t, enum MeshTunnel3CState state)
1519 LOG (GNUNET_ERROR_TYPE_DEBUG,
1520 "Tunnel %s cstate was %s\n",
1521 GMP_2s (t->peer), cstate2s (t->cstate));
1522 LOG (GNUNET_ERROR_TYPE_DEBUG,
1523 "Tunnel %s cstate is now %s\n",
1524 GMP_2s (t->peer), cstate2s (state));
1525 if (myid != GMP_get_short_id (t->peer) &&
1526 MESH_TUNNEL3_READY != t->cstate &&
1527 MESH_TUNNEL3_READY == state)
1530 if (MESH_TUNNEL3_KEY_OK == t->estate)
1532 LOG (GNUNET_ERROR_TYPE_DEBUG, " triggered send queued data\n");
1533 send_queued_data (t);
1535 else if (MESH_TUNNEL3_KEY_UNINITIALIZED == t->estate)
1537 LOG (GNUNET_ERROR_TYPE_DEBUG, " triggered rekey\n");
1538 rekey_tunnel (t, NULL);
1543 if (MESH_TUNNEL3_READY == state && 3 <= GMT_count_connections (t))
1545 GMP_stop_search (t->peer);
1550 * Change the tunnel encryption state.
1552 * @param t Tunnel whose encryption state to change.
1553 * @param state New encryption state.
1556 GMT_change_estate (struct MeshTunnel3* t, enum MeshTunnel3EState state)
1560 LOG (GNUNET_ERROR_TYPE_DEBUG,
1561 "Tunnel %s estate was %s\n",
1562 GMP_2s (t->peer), estate2s (t->estate));
1563 LOG (GNUNET_ERROR_TYPE_DEBUG,
1564 "Tunnel %s estate is now %s\n",
1565 GMP_2s (t->peer), estate2s (state));
1566 if (myid != GMP_get_short_id (t->peer) &&
1567 MESH_TUNNEL3_KEY_OK != t->estate && MESH_TUNNEL3_KEY_OK == state)
1570 send_queued_data (t);
1578 * Add a connection to a tunnel.
1581 * @param c Connection.
1584 GMT_add_connection (struct MeshTunnel3 *t, struct MeshConnection *c)
1586 struct MeshTConnection *aux;
1588 for (aux = t->connection_head; aux != NULL; aux = aux->next)
1592 aux = GNUNET_new (struct MeshTConnection);
1594 GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, aux);
1599 * Remove a connection from a tunnel.
1602 * @param c Connection.
1605 GMT_remove_connection (struct MeshTunnel3 *t, struct MeshConnection *c)
1607 struct MeshTConnection *aux;
1609 for (aux = t->connection_head; aux != NULL; aux = aux->next)
1612 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
1620 * Add a channel to a tunnel.
1623 * @param ch Channel.
1626 GMT_add_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
1628 struct MeshTChannel *aux;
1630 GNUNET_assert (NULL != ch);
1632 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
1634 for (aux = t->channel_head; aux != NULL; aux = aux->next)
1636 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
1641 aux = GNUNET_new (struct MeshTChannel);
1643 LOG (GNUNET_ERROR_TYPE_DEBUG, " adding %p to %p\n", aux, t->channel_head);
1644 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
1646 if (GNUNET_YES == t->destroy)
1648 t->destroy = GNUNET_NO;
1649 LOG (GNUNET_ERROR_TYPE_DEBUG, " undo destroy!\n");
1655 * Remove a channel from a tunnel.
1658 * @param ch Channel.
1661 GMT_remove_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
1663 struct MeshTChannel *aux;
1665 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
1666 for (aux = t->channel_head; aux != NULL; aux = aux->next)
1670 LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GMCH_2s (ch));
1671 GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
1680 * Search for a channel by global ID.
1682 * @param t Tunnel containing the channel.
1683 * @param chid Public channel number.
1685 * @return channel handler, NULL if doesn't exist
1687 struct MeshChannel *
1688 GMT_get_channel (struct MeshTunnel3 *t, MESH_ChannelNumber chid)
1690 struct MeshTChannel *iter;
1695 for (iter = t->channel_head; NULL != iter; iter = iter->next)
1697 if (GMCH_get_id (iter->ch) == chid)
1701 return NULL == iter ? NULL : iter->ch;
1706 * Tunnel is empty: destroy it.
1708 * Notifies all connections about the destruction.
1710 * @param t Tunnel to destroy.
1713 GMT_destroy_empty (struct MeshTunnel3 *t)
1715 struct MeshTConnection *iter;
1717 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel empty: destroying scheduled\n");
1718 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1720 GMC_send_destroy (iter->c);
1723 t->cstate = MESH_TUNNEL3_NEW;
1724 t->destroy = GNUNET_YES;
1729 * Destroy tunnel if empty (no more channels).
1731 * @param t Tunnel to destroy if empty.
1734 GMT_destroy_if_empty (struct MeshTunnel3 *t)
1736 if (1 < GMT_count_channels (t))
1739 GMT_destroy_empty (t);
1744 * Destroy the tunnel.
1746 * This function does not generate any warning traffic to clients or peers.
1749 * Cancel messages belonging to this tunnel queued to neighbors.
1750 * Free any allocated resources linked to the tunnel.
1752 * @param t The tunnel to destroy.
1755 GMT_destroy (struct MeshTunnel3 *t)
1757 struct MeshTConnection *iter_c;
1758 struct MeshTConnection *next_c;
1759 struct MeshTChannel *iter_ch;
1760 struct MeshTChannel *next_ch;
1765 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GMP_2s (t->peer));
1767 GNUNET_break (GNUNET_YES ==
1768 GNUNET_CONTAINER_multipeermap_remove (tunnels,
1769 GMP_get_id (t->peer), t));
1771 for (iter_c = t->connection_head; NULL != iter_c; iter_c = next_c)
1773 next_c = iter_c->next;
1774 GMC_destroy (iter_c->c);
1776 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = next_ch)
1778 next_ch = iter_ch->next;
1779 GMCH_destroy (iter_ch->ch);
1780 /* Should only happen on shutdown, but it's ok. */
1783 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
1784 GMP_set_tunnel (t->peer, NULL);
1786 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
1787 GNUNET_SCHEDULER_cancel (t->rekey_task);
1794 * @brief Use the given path for the tunnel.
1795 * Update the next and prev hops (and RCs).
1796 * (Re)start the path refresh in case the tunnel is locally owned.
1798 * @param t Tunnel to update.
1799 * @param p Path to use.
1801 * @return Connection created.
1803 struct MeshConnection *
1804 GMT_use_path (struct MeshTunnel3 *t, struct MeshPeerPath *p)
1806 struct MeshConnection *c;
1807 struct GNUNET_HashCode cid;
1808 unsigned int own_pos;
1810 if (NULL == t || NULL == p)
1816 for (own_pos = 0; own_pos < p->length; own_pos++)
1818 if (p->peers[own_pos] == myid)
1821 if (own_pos > p->length - 1)
1827 GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE, &cid);
1828 c = GMC_new (&cid, t, p, own_pos);
1829 GMT_add_connection (t, c);
1835 * Count established (ready) connections of a tunnel.
1837 * @param t Tunnel on which to count.
1839 * @return Number of connections.
1842 GMT_count_connections (struct MeshTunnel3 *t)
1844 struct MeshTConnection *iter;
1847 for (count = 0, iter = t->connection_head;
1849 iter = iter->next, count++);
1855 * Count channels of a tunnel.
1857 * @param t Tunnel on which to count.
1859 * @return Number of channels.
1862 GMT_count_channels (struct MeshTunnel3 *t)
1864 struct MeshTChannel *iter;
1867 for (count = 0, iter = t->channel_head;
1869 iter = iter->next, count++) /* skip */;
1876 * Get the connectivity state of a tunnel.
1880 * @return Tunnel's connectivity state.
1882 enum MeshTunnel3CState
1883 GMT_get_cstate (struct MeshTunnel3 *t)
1888 return (enum MeshTunnel3CState) -1;
1895 * Get the maximum buffer space for a tunnel towards a local client.
1899 * @return Biggest buffer space offered by any channel in the tunnel.
1902 GMT_get_channels_buffer (struct MeshTunnel3 *t)
1904 struct MeshTChannel *iter;
1905 unsigned int buffer;
1906 unsigned int ch_buf;
1908 if (NULL == t->channel_head)
1910 /* Probably getting buffer for a channel create/handshake. */
1915 for (iter = t->channel_head; NULL != iter; iter = iter->next)
1917 ch_buf = get_channel_buffer (iter);
1918 if (ch_buf > buffer)
1926 * Get the total buffer space for a tunnel for P2P traffic.
1930 * @return Buffer space offered by all connections in the tunnel.
1933 GMT_get_connections_buffer (struct MeshTunnel3 *t)
1935 struct MeshTConnection *iter;
1936 unsigned int buffer;
1939 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1941 if (GMC_get_state (iter->c) != MESH_CONNECTION_READY)
1946 buffer += get_connection_buffer (iter);
1954 * Get the tunnel's destination.
1958 * @return ID of the destination peer.
1960 const struct GNUNET_PeerIdentity *
1961 GMT_get_destination (struct MeshTunnel3 *t)
1963 return GMP_get_id (t->peer);
1968 * Get the tunnel's next free global channel ID.
1972 * @return GID of a channel free to use.
1975 GMT_get_next_chid (struct MeshTunnel3 *t)
1977 MESH_ChannelNumber chid;
1978 MESH_ChannelNumber mask;
1981 /* Set bit 30 depending on the ID relationship. Bit 31 is always 0 for GID.
1982 * If our ID is bigger or loopback tunnel, start at 0, bit 30 = 0
1983 * If peer's ID is bigger, start at 0x4... bit 30 = 1
1985 result = GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, GMP_get_id (t->peer));
1991 while (NULL != GMT_get_channel (t, t->next_chid))
1993 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
1994 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1995 t->next_chid |= mask;
1997 chid = t->next_chid;
1998 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1999 t->next_chid |= mask;
2006 * Send ACK on one or more channels due to buffer in connections.
2008 * @param t Channel which has some free buffer space.
2011 GMT_unchoke_channels (struct MeshTunnel3 *t)
2013 struct MeshTChannel *iter;
2014 unsigned int buffer;
2015 unsigned int channels = GMT_count_channels (t);
2016 unsigned int choked_n;
2017 struct MeshChannel *choked[channels];
2019 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_unchoke_channels on %s\n", GMT_2s (t));
2020 LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
2021 if (NULL != t->channel_head)
2022 LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
2024 /* Get buffer space */
2025 buffer = GMT_get_connections_buffer (t);
2031 /* Count and remember choked channels */
2033 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2035 if (GNUNET_NO == get_channel_allowed (iter))
2037 choked[choked_n++] = iter->ch;
2041 /* Unchoke random channels */
2042 while (0 < buffer && 0 < choked_n)
2044 unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2046 GMCH_allow_client (choked[r], GMCH_is_origin (choked[r], GNUNET_YES));
2049 choked[r] = choked[choked_n];
2055 * Send ACK on one or more connections due to buffer space to the client.
2057 * Iterates all connections of the tunnel and sends ACKs appropriately.
2062 GMT_send_connection_acks (struct MeshTunnel3 *t)
2064 struct MeshTConnection *iter;
2067 uint32_t allow_per_connection;
2069 unsigned int buffer;
2071 LOG (GNUNET_ERROR_TYPE_DEBUG,
2072 "Tunnel send connection ACKs on %s\n",
2081 buffer = GMT_get_channels_buffer (t);
2083 /* Count connections, how many messages are already allowed */
2084 cs = GMT_count_connections (t);
2085 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2087 allowed += get_connection_allowed (iter);
2090 /* Make sure there is no overflow */
2091 if (allowed > buffer)
2096 /* Authorize connections to send more data */
2097 to_allow = buffer; /* - allowed; */
2099 for (iter = t->connection_head; NULL != iter && to_allow > 0; iter = iter->next)
2101 allow_per_connection = to_allow/cs;
2102 to_allow -= allow_per_connection;
2104 if (get_connection_allowed (iter) > 64 / 3)
2108 GMC_allow (iter->c, buffer, GMC_is_origin (iter->c, GNUNET_YES));
2111 GNUNET_break (to_allow == 0);
2116 * Callback called when a queued message is sent.
2118 * Calculates the average time and connection packet tracking.
2120 * @param cls Closure (TunnelQueue handle).
2121 * @param c Connection this message was on.
2122 * @param type Type of message sent.
2123 * @param fwd Was this a FWD going message?
2124 * @param size Size of the message.
2127 message_sent (void *cls,
2128 struct MeshConnection *c,
2129 struct MeshConnectionQueue *q,
2130 uint16_t type, int fwd, size_t size)
2132 struct MeshTunnel3Queue *qt = cls;
2134 GNUNET_assert (NULL != qt->cont);
2135 qt->cont (qt->cont_cls, GMC_get_tunnel (c), qt, type, size);
2141 * Cancel a previously sent message while it's in the queue.
2143 * ONLY can be called before the continuation given to the send function
2144 * is called. Once the continuation is called, the message is no longer in the
2147 * @param q Handle to the queue.
2150 GMT_cancel (struct MeshTunnel3Queue *q)
2153 /* message_sent() will be called and free q */
2158 * Sends an already built message on a tunnel, encrypting it and
2159 * choosing the best connection.
2161 * @param message Message to send. Function modifies it.
2162 * @param t Tunnel on which this message is transmitted.
2163 * @param ch Channel on which this message is transmitted.
2164 * @param force Force the tunnel to take the message (buffer overfill).
2165 * @param cont Continuation to call once message is really sent.
2166 * @param cont_cls Closure for @c cont.
2168 * @return Handle to cancel message. NULL if @c cont is NULL.
2170 struct MeshTunnel3Queue *
2171 GMT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2172 struct MeshTunnel3 *t, struct MeshChannel *ch,
2174 GMT_sent cont, void *cont_cls)
2176 struct MeshTunnel3Queue *q;
2177 struct MeshConnection *c;
2178 struct GNUNET_MESH_Encrypted *msg;
2179 size_t size = ntohs (message->size);
2180 size_t encrypted_size;
2181 char cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
2186 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GMT_2s (t));
2188 if (GNUNET_NO == is_ready (t))
2190 queue_data (t, ch, message);
2195 GNUNET_assert (GNUNET_NO == GMT_is_loopback (t));
2197 iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
2198 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
2199 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED);
2201 encrypted_size = t_encrypt (t, &msg[1], message, size, iv);
2202 msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + encrypted_size);
2203 c = tunnel_get_connection (t);
2206 GNUNET_break (GNUNET_YES == t->destroy);
2209 type = ntohs (message->type);
2212 case GNUNET_MESSAGE_TYPE_MESH_DATA:
2213 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
2214 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
2215 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
2216 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
2217 msg->cid = *GMC_get_id (c);
2218 msg->ttl = htonl (default_ttl);
2221 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
2226 fwd = GMC_is_origin (c, GNUNET_YES);
2230 (void) GMC_send_prebuilt_message (&msg->header, c, fwd, force, NULL, NULL);
2233 q = GNUNET_new (struct MeshTunnel3Queue); /* FIXME valgrind: leak*/
2234 q->q = GMC_send_prebuilt_message (&msg->header, c, fwd, force,
2237 q->cont_cls = cont_cls;
2243 * Is the tunnel directed towards the local peer?
2247 * @return #GNUNET_YES if it is loopback.
2250 GMT_is_loopback (const struct MeshTunnel3 *t)
2252 return (myid == GMP_get_short_id (t->peer));
2257 * Is the tunnel this path already?
2262 * @return #GNUNET_YES a connection uses this path.
2265 GMT_is_path_used (const struct MeshTunnel3 *t, const struct MeshPeerPath *p)
2267 struct MeshTConnection *iter;
2269 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2270 if (GMC_get_path (iter->c) == p)
2278 * Get a cost of a path for a tunnel considering existing connections.
2281 * @param path Candidate path.
2283 * @return Cost of the path (path length + number of overlapping nodes)
2286 GMT_get_path_cost (const struct MeshTunnel3 *t,
2287 const struct MeshPeerPath *path)
2289 struct MeshTConnection *iter;
2290 const struct MeshPeerPath *aux;
2291 unsigned int overlap;
2299 GNUNET_assert (NULL != t);
2301 for (i = 0; i < path->length; i++)
2303 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2305 aux = GMC_get_path (iter->c);
2309 for (j = 0; j < aux->length; j++)
2311 if (path->peers[i] == aux->peers[j])
2319 return (path->length + overlap) * (path->score * -1);
2324 * Get the static string for the peer this tunnel is directed.
2328 * @return Static string the destination peer's ID.
2331 GMT_2s (const struct MeshTunnel3 *t)
2336 return GMP_2s (t->peer);