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 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;
511 GNUNET_CRYPTO_symmetric_derive_iv (&siv, &t->e_key, &iv, sizeof (uint32_t), NULL);
512 return GNUNET_CRYPTO_symmetric_encrypt (src, size, &t->e_key, &siv, dst);
517 * Decrypt data with the tunnel key.
519 * @param t Tunnel whose key to use.
520 * @param dst Destination for the plaintext.
521 * @param src Source of the encrypted data. Can overlap with @c dst.
522 * @param size Size of the encrypted data.
523 * @param iv Initialization Vector to use.
526 t_decrypt (struct MeshTunnel3 *t,
527 void *dst, const void *src,
528 size_t size, uint32_t iv)
530 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
531 struct GNUNET_CRYPTO_SymmetricSessionKey *key;
533 if (t->estate == MESH_TUNNEL3_KEY_OK || t->estate == MESH_TUNNEL3_KEY_PING)
537 else if (NULL != t->kx_ctx)
539 key = &t->kx_ctx->d_key_old;
543 GNUNET_STATISTICS_update (stats, "# non decryptable data", 1, GNUNET_NO);
544 LOG (GNUNET_ERROR_TYPE_DEBUG,
545 "WARNING got data on %s without a valid key\n",
551 GNUNET_CRYPTO_symmetric_derive_iv (&siv, key, &iv, sizeof (uint32_t), NULL);
552 return GNUNET_CRYPTO_symmetric_decrypt (src, size, key, &siv, dst);
557 * Create key material by doing ECDH on the local and remote ephemeral keys.
559 * @param key_material Where to store the key material.
560 * @param ephemeral_key Peer's public ephemeral key.
563 derive_key_material (struct GNUNET_HashCode *key_material,
564 const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key)
567 GNUNET_CRYPTO_ecc_ecdh (my_ephemeral_key,
576 * Create a symmetic key from the identities of both ends and the key material
579 * @param key Destination for the generated key.
580 * @param sender ID of the peer that will encrypt with @c key.
581 * @param receiver ID of the peer that will decrypt with @c key.
582 * @param key_material Hash created with ECDH with the ephemeral keys.
585 derive_symmertic (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
586 const struct GNUNET_PeerIdentity *sender,
587 const struct GNUNET_PeerIdentity *receiver,
588 const struct GNUNET_HashCode *key_material)
590 const char salt[] = "MESH kx salt";
592 GNUNET_CRYPTO_kdf (key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
594 key_material, sizeof (struct GNUNET_HashCode),
595 sender, sizeof (struct GNUNET_PeerIdentity),
596 receiver, sizeof (struct GNUNET_PeerIdentity),
601 * Pick a connection on which send the next data message.
603 * @param t Tunnel on which to send the message.
605 * @return The connection on which to send the next message.
607 static struct MeshConnection *
608 tunnel_get_connection (struct MeshTunnel3 *t)
610 struct MeshTConnection *iter;
611 struct MeshConnection *best;
613 unsigned int lowest_q;
615 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GMP_2s (t->peer));
618 for (iter = t->connection_head; NULL != iter; iter = iter->next)
620 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
621 GMC_2s (iter->c), GMC_get_state (iter->c));
622 if (MESH_CONNECTION_READY == GMC_get_state (iter->c))
624 qn = GMC_get_qn (iter->c, GMC_is_origin (iter->c, GNUNET_YES));
625 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
633 LOG (GNUNET_ERROR_TYPE_DEBUG, " selected: connection %s\n", GMC_2s (best));
639 * Callback called when a queued message is sent.
641 * Calculates the average time and connection packet tracking.
643 * @param cls Closure (TunnelQueue handle).
644 * @param c Connection this message was on.
645 * @param q Connection queue handle (unused).
646 * @param type Type of message sent.
647 * @param fwd Was this a FWD going message?
648 * @param size Size of the message.
651 message_sent (void *cls,
652 struct MeshConnection *c,
653 struct MeshConnectionQueue *q,
654 uint16_t type, int fwd, size_t size)
656 struct MeshTunnel3Queue *qt = cls;
658 GNUNET_assert (NULL != qt->cont);
659 qt->cont (qt->cont_cls, GMC_get_tunnel (c), qt, type, size);
665 * Delete a queued message: either was sent or the channel was destroyed
666 * before the tunnel's key exchange had a chance to finish.
668 * @param tqd Delayed queue handle.
671 unqueue_data (struct MeshTunnelDelayed *tqd)
673 GNUNET_CONTAINER_DLL_remove (tqd->t->tq_head, tqd->t->tq_tail, tqd);
679 * Cache a message to be sent once tunnel is online.
681 * @param t Tunnel to hold the message.
682 * @param msg Message itself (copy will be made).
684 static struct MeshTunnelDelayed *
685 queue_data (struct MeshTunnel3 *t, const struct GNUNET_MessageHeader *msg)
687 struct MeshTunnelDelayed *tqd;
688 uint16_t size = ntohs (msg->size);
690 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue data on Tunnel %s\n", GMT_2s (t));
692 if (GNUNET_YES == is_ready (t))
698 tqd = GNUNET_malloc (sizeof (struct MeshTunnelDelayed) + size);
701 memcpy (&tqd[1], msg, size);
702 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tqd);
709 * Sends an already built message on a tunnel, encrypting it and
710 * choosing the best connection.
712 * @param message Message to send. Function modifies it.
713 * @param t Tunnel on which this message is transmitted.
714 * @param force Force the tunnel to take the message (buffer overfill).
715 * @param cont Continuation to call once message is really sent.
716 * @param cont_cls Closure for @c cont.
717 * @param existing_q In case this a transmission of previously queued data,
718 * this should be TunnelQueue given to the client.
721 * @return Handle to cancel message. NULL if @c cont is NULL.
723 static struct MeshTunnel3Queue *
724 send_prebuilt_message (const struct GNUNET_MessageHeader *message,
725 struct MeshTunnel3 *t, int force,
726 GMT_sent cont, void *cont_cls,
727 struct MeshTunnel3Queue *existing_q)
729 struct MeshTunnel3Queue *tq;
730 struct MeshConnection *c;
731 struct GNUNET_MESH_Encrypted *msg;
732 size_t size = ntohs (message->size);
733 char cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
738 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GMT_2s (t));
740 if (GNUNET_NO == is_ready (t))
742 struct MeshTunnelDelayed *tqd;
743 /* A non null existing_q indicates sending of queued data.
744 * Should only happen after tunnel becomes ready.
746 GNUNET_assert (NULL == existing_q);
747 tqd = queue_data (t, message);
750 tq = GNUNET_new (struct MeshTunnel3Queue);
754 tq->cont_cls = cont_cls;
758 GNUNET_assert (GNUNET_NO == GMT_is_loopback (t));
760 iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
761 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
762 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED);
764 GNUNET_assert (t_encrypt (t, &msg[1], message, size, iv) == size);
765 msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size);
766 c = tunnel_get_connection (t);
769 if (GNUNET_YES == t->destroy || MESH_TUNNEL3_SEARCHING != t->cstate)
776 type = ntohs (message->type);
779 case GNUNET_MESSAGE_TYPE_MESH_DATA:
780 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
781 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
782 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
783 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
784 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK:
785 msg->cid = *GMC_get_id (c);
786 msg->ttl = htonl (default_ttl);
789 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
794 fwd = GMC_is_origin (c, GNUNET_YES);
798 (void) GMC_send_prebuilt_message (&msg->header, c, fwd, force, NULL, NULL);
801 if (NULL == existing_q)
803 tq = GNUNET_new (struct MeshTunnel3Queue); /* FIXME valgrind: leak*/
810 tq->cq = GMC_send_prebuilt_message (&msg->header, c, fwd, force,
813 tq->cont_cls = cont_cls;
820 * Send all cached messages that we can, tunnel is online.
822 * @param t Tunnel that holds the messages. Cannot be loopback.
825 send_queued_data (struct MeshTunnel3 *t)
827 struct MeshTunnelDelayed *tqd;
828 struct MeshTunnelDelayed *next;
831 LOG (GNUNET_ERROR_TYPE_DEBUG,
832 "GMT_send_queued_data on tunnel %s\n",
835 if (GMT_is_loopback (t))
841 if (GNUNET_NO == is_ready (t))
843 LOG (GNUNET_ERROR_TYPE_DEBUG, " not ready yet: %s/%s\n",
844 estate2s (t->estate), cstate2s (t->cstate));
848 room = GMT_get_connections_buffer (t);
849 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
850 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq head: %p\n", t->tq_head);
851 for (tqd = t->tq_head; NULL != tqd && room > 0; tqd = next)
853 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending queued data\n");
856 send_prebuilt_message ((struct GNUNET_MessageHeader *) &tqd[1],
858 NULL != tqd->tq ? tqd->tq->cont : NULL,
859 NULL != tqd->tq ? tqd->tq->cont_cls : NULL,
863 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_send_queued_data end\n", GMP_2s (t->peer));
868 * Sends key exchange message on a tunnel, choosing the best connection.
869 * Should not be called on loopback tunnels.
871 * @param t Tunnel on which this message is transmitted.
872 * @param message Message to send. Function modifies it.
875 send_kx (struct MeshTunnel3 *t,
876 const struct GNUNET_MessageHeader *message)
878 struct MeshConnection *c;
879 struct GNUNET_MESH_KX *msg;
880 size_t size = ntohs (message->size);
881 char cbuf[sizeof (struct GNUNET_MESH_KX) + size];
885 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT KX on Tunnel %s\n", GMT_2s (t));
887 /* Avoid loopback. */
888 if (GMT_is_loopback (t))
890 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback!\n");
895 if (GNUNET_NO != t->destroy)
897 LOG (GNUNET_ERROR_TYPE_DEBUG, " being destroyed, why bother\n");
901 /* Must have a connection. */
902 if (NULL == t->connection_head)
904 GNUNET_break (MESH_TUNNEL3_SEARCHING == t->cstate);
909 msg = (struct GNUNET_MESH_KX *) cbuf;
910 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX);
911 msg->header.size = htons (sizeof (struct GNUNET_MESH_KX) + size);
912 c = tunnel_get_connection (t);
915 GNUNET_break (GNUNET_YES == t->destroy || MESH_TUNNEL3_READY != t->cstate);
919 type = ntohs (message->type);
922 case GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL:
923 case GNUNET_MESSAGE_TYPE_MESH_KX_PING:
924 case GNUNET_MESSAGE_TYPE_MESH_KX_PONG:
925 msg->reserved = htonl (0);
926 memcpy (&msg[1], message, size);
929 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
934 fwd = GMC_is_origin (t->connection_head->c, GNUNET_YES);
935 /* TODO save handle and cancel in case of a unneeded retransmission */
936 GMC_send_prebuilt_message (&msg->header, c, fwd, GNUNET_YES, NULL, NULL);
941 * Send the ephemeral key on a tunnel.
943 * @param t Tunnel on which to send the key.
946 send_ephemeral (struct MeshTunnel3 *t)
948 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __FUNCTION__);
950 kx_msg.sender_status = htonl (t->estate);
951 send_kx (t, &kx_msg.header);
955 * Send a ping message on a tunnel.
957 * @param t Tunnel on which to send the ping.
960 send_ping (struct MeshTunnel3 *t)
962 struct GNUNET_MESH_KX_Ping msg;
964 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __FUNCTION__);
965 msg.header.size = htons (sizeof (msg));
966 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_PING);
967 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
968 msg.target = *GMP_get_id (t->peer);
969 msg.nonce = t->kx_ctx->challenge;
971 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
972 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&msg.target));
973 t_encrypt (t, &msg.target, &msg.target, ping_encryption_size(), msg.iv);
974 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
975 LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg.target));
977 send_kx (t, &msg.header);
982 * Send a pong message on a tunnel.
984 * @param t Tunnel on which to send the pong.
985 * @param challenge Value sent in the ping that we have to send back.
988 send_pong (struct MeshTunnel3 *t, uint32_t challenge)
990 struct GNUNET_MESH_KX_Pong msg;
992 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s()\n", __FUNCTION__);
993 msg.header.size = htons (sizeof (msg));
994 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_PONG);
995 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
996 msg.nonce = challenge;
997 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
998 t_encrypt (t, &msg.nonce, &msg.nonce, sizeof (msg.nonce), msg.iv);
999 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
1001 send_kx (t, &msg.header);
1006 * Initiate a rekey with the remote peer.
1008 * @param cls Closure (tunnel).
1009 * @param tc TaskContext.
1012 rekey_tunnel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1014 struct MeshTunnel3 *t = cls;
1016 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
1018 LOG (GNUNET_ERROR_TYPE_DEBUG, "Re-key Tunnel %s\n", GMT_2s (t));
1019 if (NULL != tc && 0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1022 if (NULL == t->kx_ctx)
1024 LOG (GNUNET_ERROR_TYPE_DEBUG, " new kx ctx\n");
1025 t->kx_ctx = GNUNET_new (struct MeshTunnelKXCtx);
1026 t->kx_ctx->challenge =
1027 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1028 t->kx_ctx->d_key_old = t->d_key;
1029 LOG (GNUNET_ERROR_TYPE_DEBUG, " new challenge for %s: %u\n",
1030 GMT_2s (t), t->kx_ctx->challenge);
1035 case MESH_TUNNEL3_KEY_UNINITIALIZED:
1036 t->estate = MESH_TUNNEL3_KEY_SENT;
1038 case MESH_TUNNEL3_KEY_SENT:
1040 case MESH_TUNNEL3_KEY_PING:
1041 case MESH_TUNNEL3_KEY_OK:
1043 t->estate = MESH_TUNNEL3_KEY_PING;
1046 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unexpected state %u\n", t->estate);
1049 LOG (GNUNET_ERROR_TYPE_DEBUG, " next call in %s\n",
1050 GNUNET_STRINGS_relative_time_to_string (REKEY_WAIT, GNUNET_YES));
1051 t->rekey_task = GNUNET_SCHEDULER_add_delayed (REKEY_WAIT, &rekey_tunnel, t);
1056 * Out ephemeral key has changed, create new session key on all tunnels.
1058 * @param cls Closure (size of the hashmap).
1059 * @param key Current public key.
1060 * @param value Value in the hash map (tunnel).
1062 * @return #GNUNET_YES, so we should continue to iterate,
1065 rekey_iterator (void *cls,
1066 const struct GNUNET_PeerIdentity *key,
1069 struct MeshTunnel3 *t = value;
1070 struct GNUNET_TIME_Relative delay;
1071 long n = (long) cls;
1074 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
1077 r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, (uint32_t) n * 100);
1078 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, r);
1079 t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
1086 * Create a new ephemeral key and key message, schedule next rekeying.
1088 * @param cls Closure (unused).
1089 * @param tc TaskContext.
1092 rekey (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1094 struct GNUNET_TIME_Absolute time;
1097 rekey_task = GNUNET_SCHEDULER_NO_TASK;
1099 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1102 GNUNET_free_non_null (my_ephemeral_key);
1103 my_ephemeral_key = GNUNET_CRYPTO_ecdhe_key_create ();
1105 time = GNUNET_TIME_absolute_get ();
1106 kx_msg.creation_time = GNUNET_TIME_absolute_hton (time);
1107 time = GNUNET_TIME_absolute_add (time, rekey_period);
1108 time = GNUNET_TIME_absolute_add (time, GNUNET_TIME_UNIT_MINUTES);
1109 kx_msg.expiration_time = GNUNET_TIME_absolute_hton (time);
1110 GNUNET_CRYPTO_ecdhe_key_get_public (my_ephemeral_key, &kx_msg.ephemeral_key);
1112 GNUNET_assert (GNUNET_OK ==
1113 GNUNET_CRYPTO_eddsa_sign (my_private_key,
1115 &kx_msg.signature));
1117 n = (long) GNUNET_CONTAINER_multipeermap_size (tunnels);
1118 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &rekey_iterator, (void *) n);
1120 rekey_task = GNUNET_SCHEDULER_add_delayed (rekey_period, &rekey, NULL);
1125 * Called only on shutdown, destroy every tunnel.
1127 * @param cls Closure (unused).
1128 * @param key Current public key.
1129 * @param value Value in the hash map (tunnel).
1131 * @return #GNUNET_YES, so we should continue to iterate,
1134 destroy_iterator (void *cls,
1135 const struct GNUNET_PeerIdentity *key,
1138 struct MeshTunnel3 *t = value;
1146 * Notify remote peer that we don't know a channel he is talking about,
1147 * probably CHANNEL_DESTROY was missed.
1149 * @param t Tunnel on which to notify.
1150 * @param gid ID of the channel.
1153 send_channel_destroy (struct MeshTunnel3 *t, unsigned int gid)
1155 struct GNUNET_MESH_ChannelManage msg;
1157 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
1158 msg.header.size = htons (sizeof (msg));
1159 msg.chid = htonl (gid);
1161 LOG (GNUNET_ERROR_TYPE_DEBUG,
1162 "WARNING destroying unknown channel %u on tunnel %s\n",
1164 send_prebuilt_message (&msg.header, t, GNUNET_YES, NULL, NULL, NULL);
1169 * Demultiplex data per channel and call appropriate channel handler.
1171 * @param t Tunnel on which the data came.
1172 * @param msg Data message.
1173 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1174 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1175 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1176 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1179 handle_data (struct MeshTunnel3 *t,
1180 const struct GNUNET_MESH_Data *msg,
1183 struct MeshChannel *ch;
1187 size = ntohs (msg->header.size);
1189 sizeof (struct GNUNET_MESH_Data) +
1190 sizeof (struct GNUNET_MessageHeader))
1195 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
1196 GM_m2s (ntohs (msg[1].header.type)));
1199 ch = GMT_get_channel (t, ntohl (msg->chid));
1202 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
1204 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel 0x%X unknown\n",
1206 send_channel_destroy (t, ntohl (msg->chid));
1210 GMCH_handle_data (ch, msg, fwd);
1215 * Demultiplex data ACKs per channel and update appropriate channel buffer info.
1217 * @param t Tunnel on which the DATA ACK came.
1218 * @param msg DATA ACK message.
1219 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1220 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1221 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1222 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1225 handle_data_ack (struct MeshTunnel3 *t,
1226 const struct GNUNET_MESH_DataACK *msg,
1229 struct MeshChannel *ch;
1233 size = ntohs (msg->header.size);
1234 if (size != sizeof (struct GNUNET_MESH_DataACK))
1241 ch = GMT_get_channel (t, ntohl (msg->chid));
1244 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
1246 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1251 GMCH_handle_data_ack (ch, msg, fwd);
1256 * Handle channel create.
1258 * @param t Tunnel on which the data came.
1259 * @param msg Data message.
1262 handle_ch_create (struct MeshTunnel3 *t,
1263 const struct GNUNET_MESH_ChannelCreate *msg)
1265 struct MeshChannel *ch;
1269 size = ntohs (msg->header.size);
1270 if (size != sizeof (struct GNUNET_MESH_ChannelCreate))
1277 ch = GMT_get_channel (t, ntohl (msg->chid));
1278 if (NULL != ch && ! GMT_is_loopback (t))
1280 /* Probably a retransmission, safe to ignore */
1281 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
1285 ch = GMCH_handle_create (t, msg);
1288 GMT_add_channel (t, ch);
1294 * Handle channel NACK: check correctness and call channel handler for NACKs.
1296 * @param t Tunnel on which the NACK came.
1297 * @param msg NACK message.
1300 handle_ch_nack (struct MeshTunnel3 *t,
1301 const struct GNUNET_MESH_ChannelManage *msg)
1303 struct MeshChannel *ch;
1307 size = ntohs (msg->header.size);
1308 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1315 ch = GMT_get_channel (t, ntohl (msg->chid));
1318 GNUNET_STATISTICS_update (stats, "# channel NACK on unknown channel",
1320 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1325 GMCH_handle_nack (ch);
1330 * Handle a CHANNEL ACK (SYNACK/ACK).
1332 * @param t Tunnel on which the CHANNEL ACK came.
1333 * @param msg CHANNEL ACK message.
1334 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1335 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1336 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1337 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1340 handle_ch_ack (struct MeshTunnel3 *t,
1341 const struct GNUNET_MESH_ChannelManage *msg,
1344 struct MeshChannel *ch;
1348 size = ntohs (msg->header.size);
1349 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1356 ch = GMT_get_channel (t, ntohl (msg->chid));
1359 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
1361 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1366 GMCH_handle_ack (ch, msg, fwd);
1372 * Handle a channel destruction message.
1374 * @param t Tunnel on which the message came.
1375 * @param msg Channel destroy message.
1376 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1377 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1378 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1379 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1382 handle_ch_destroy (struct MeshTunnel3 *t,
1383 const struct GNUNET_MESH_ChannelManage *msg,
1386 struct MeshChannel *ch;
1390 size = ntohs (msg->header.size);
1391 if (size != sizeof (struct GNUNET_MESH_ChannelManage))
1398 ch = GMT_get_channel (t, ntohl (msg->chid));
1401 /* Probably a retransmission, safe to ignore */
1405 GMCH_handle_destroy (ch, msg, fwd);
1410 * The peer's ephemeral key has changed: update the symmetrical keys.
1412 * @param t Tunnel this message came on.
1413 * @param msg Key eXchange message.
1416 handle_ephemeral (struct MeshTunnel3 *t,
1417 const struct GNUNET_MESH_KX_Ephemeral *msg)
1419 struct GNUNET_HashCode km;
1420 LOG (GNUNET_ERROR_TYPE_DEBUG, " ephemeral key message\n");
1422 if (GNUNET_OK != check_ephemeral (t, msg))
1424 GNUNET_break_op (0);
1427 derive_key_material (&km, &msg->ephemeral_key);
1428 LOG (GNUNET_ERROR_TYPE_DEBUG, " km is %s\n", GNUNET_h2s (&km));
1429 derive_symmertic (&t->e_key, &my_full_id, GMP_get_id (t->peer), &km);
1430 derive_symmertic (&t->d_key, GMP_get_id (t->peer), &my_full_id, &km);
1431 if (MESH_TUNNEL3_KEY_SENT == t->estate)
1433 LOG (GNUNET_ERROR_TYPE_DEBUG, " our key was sent, send ping\n");
1435 t->estate = MESH_TUNNEL3_KEY_PING;
1441 * Peer wants to check our symmetrical keys by sending an encrypted challenge.
1442 * Answer with by retransmitting the challenge with the "opposite" key.
1444 * @param t Tunnel this message came on.
1445 * @param msg Key eXchange Ping message.
1448 handle_ping (struct MeshTunnel3 *t,
1449 const struct GNUNET_MESH_KX_Ping *msg)
1451 struct GNUNET_MESH_KX_Ping res;
1453 if (ntohs (msg->header.size) != sizeof (res))
1455 GNUNET_break_op (0);
1459 LOG (GNUNET_ERROR_TYPE_DEBUG, " ping message\n");
1460 t_decrypt (t, &res.target, &msg->target, ping_encryption_size (), msg->iv);
1461 if (0 != memcmp (&my_full_id, &res.target, sizeof (my_full_id)))
1463 GNUNET_STATISTICS_update (stats, "# malformed PINGs", 1, GNUNET_NO);
1464 LOG (GNUNET_ERROR_TYPE_DEBUG, " WARNING malformed PING\n");
1465 LOG (GNUNET_ERROR_TYPE_DEBUG, " e got %u\n", msg->nonce);
1466 LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg->target));
1467 LOG (GNUNET_ERROR_TYPE_DEBUG, " got %u\n", res.nonce);
1468 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&res.target));
1472 send_pong (t, res.nonce);
1477 * Peer has answer to our challenge.
1478 * If answer is successful, consider the key exchange finished and clean
1479 * up all related state.
1481 * @param t Tunnel this message came on.
1482 * @param msg Key eXchange Pong message.
1485 handle_pong (struct MeshTunnel3 *t,
1486 const struct GNUNET_MESH_KX_Pong *msg)
1490 LOG (GNUNET_ERROR_TYPE_DEBUG, "PONG received\n");
1491 if (GNUNET_SCHEDULER_NO_TASK == t->rekey_task)
1493 GNUNET_STATISTICS_update (stats, "# duplicate PONG messages", 1, GNUNET_NO);
1496 t_decrypt (t, &challenge, &msg->nonce, sizeof (uint32_t), msg->iv);
1498 if (challenge != t->kx_ctx->challenge)
1500 LOG (GNUNET_ERROR_TYPE_DEBUG,
1501 "Wrong PONG challenge: %u (e: %u). Expected: %u.\n",
1502 challenge, msg->nonce, t->kx_ctx->challenge);
1503 GNUNET_break_op (0);
1506 GNUNET_SCHEDULER_cancel (t->rekey_task);
1507 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
1508 GNUNET_free (t->kx_ctx);
1510 GMT_change_estate (t, MESH_TUNNEL3_KEY_OK);
1515 * Demultiplex by message type and call appropriate handler for a message
1516 * towards a channel of a local tunnel.
1518 * @param t Tunnel this message came on.
1519 * @param msgh Message header.
1520 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1521 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1522 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1523 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1526 handle_decrypted (struct MeshTunnel3 *t,
1527 const struct GNUNET_MessageHeader *msgh,
1532 type = ntohs (msgh->type);
1533 LOG (GNUNET_ERROR_TYPE_DEBUG,
1534 "Got a %s message!\n",
1539 case GNUNET_MESSAGE_TYPE_MESH_DATA:
1540 /* Don't send hop ACK, wait for client to ACK */
1541 handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd);
1544 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
1545 handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd);
1548 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1549 handle_ch_create (t,
1550 (struct GNUNET_MESH_ChannelCreate *) msgh);
1553 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK:
1555 (struct GNUNET_MESH_ChannelManage *) msgh);
1558 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
1560 (struct GNUNET_MESH_ChannelManage *) msgh,
1564 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1565 handle_ch_destroy (t,
1566 (struct GNUNET_MESH_ChannelManage *) msgh,
1571 GNUNET_break_op (0);
1572 LOG (GNUNET_ERROR_TYPE_DEBUG,
1573 "end-to-end message not known (%u)\n",
1574 ntohs (msgh->type));
1579 /******************************************************************************/
1580 /******************************** API ***********************************/
1581 /******************************************************************************/
1584 * Decrypt and demultiplex by message type. Call appropriate handler
1585 * for every message.
1587 * @param t Tunnel this message came on.
1588 * @param msg Encrypted message.
1591 GMT_handle_encrypted (struct MeshTunnel3 *t,
1592 const struct GNUNET_MESH_Encrypted *msg)
1594 size_t size = ntohs (msg->header.size);
1595 size_t payload_size = size - sizeof (struct GNUNET_MESH_Encrypted);
1596 size_t decrypted_size;
1597 char cbuf [payload_size];
1598 struct GNUNET_MessageHeader *msgh;
1601 decrypted_size = t_decrypt (t, cbuf, &msg[1], payload_size, msg->iv);
1603 while (off < decrypted_size)
1605 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
1606 handle_decrypted (t, msgh, GNUNET_SYSERR);
1607 off += ntohs (msgh->size);
1613 * Demultiplex an encapsulated KX message by message type.
1615 * @param t Tunnel on which the message came.
1616 * @param message Payload of KX message.
1619 GMT_handle_kx (struct MeshTunnel3 *t,
1620 const struct GNUNET_MessageHeader *message)
1624 type = ntohs (message->type);
1625 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message received\n", type);
1628 case GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL:
1629 handle_ephemeral (t, (struct GNUNET_MESH_KX_Ephemeral *) message);
1632 case GNUNET_MESSAGE_TYPE_MESH_KX_PING:
1633 handle_ping (t, (struct GNUNET_MESH_KX_Ping *) message);
1636 case GNUNET_MESSAGE_TYPE_MESH_KX_PONG:
1637 handle_pong (t, (struct GNUNET_MESH_KX_Pong *) message);
1641 GNUNET_break_op (0);
1642 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message not known (%u)\n", type);
1648 * Initialize the tunnel subsystem.
1650 * @param c Configuration handle.
1651 * @param key ECC private key, to derive all other keys and do crypto.
1654 GMT_init (const struct GNUNET_CONFIGURATION_Handle *c,
1655 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
1657 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
1659 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
1662 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1663 "MESH", "DEFAULT_TTL", "USING DEFAULT");
1667 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REKEY_PERIOD",
1670 rekey_period = GNUNET_TIME_UNIT_DAYS;
1673 my_private_key = key;
1674 kx_msg.header.size = htons (sizeof (kx_msg));
1675 kx_msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KX_EPHEMERAL);
1676 kx_msg.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_MESH_KX);
1677 kx_msg.purpose.size = htonl (ephemeral_purpose_size ());
1678 kx_msg.origin_identity = my_full_id;
1679 rekey_task = GNUNET_SCHEDULER_add_now (&rekey, NULL);
1681 tunnels = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1686 * Shut down the tunnel subsystem.
1691 if (GNUNET_SCHEDULER_NO_TASK != rekey_task)
1693 GNUNET_SCHEDULER_cancel (rekey_task);
1694 rekey_task = GNUNET_SCHEDULER_NO_TASK;
1696 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &destroy_iterator, NULL);
1697 GNUNET_CONTAINER_multipeermap_destroy (tunnels);
1704 * @param destination Peer this tunnel is towards.
1706 struct MeshTunnel3 *
1707 GMT_new (struct MeshPeer *destination)
1709 struct MeshTunnel3 *t;
1711 t = GNUNET_new (struct MeshTunnel3);
1713 t->peer = destination;
1716 GNUNET_CONTAINER_multipeermap_put (tunnels, GMP_get_id (destination), t,
1717 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1728 * Change the tunnel's connection state.
1730 * @param t Tunnel whose connection state to change.
1731 * @param cstate New connection state.
1734 GMT_change_cstate (struct MeshTunnel3* t, enum MeshTunnel3CState cstate)
1738 LOG (GNUNET_ERROR_TYPE_DEBUG,
1739 "Tunnel %s cstate was %s\n",
1740 GMP_2s (t->peer), cstate2s (t->cstate));
1741 LOG (GNUNET_ERROR_TYPE_DEBUG,
1742 "Tunnel %s cstate is now %s\n",
1743 GMP_2s (t->peer), cstate2s (cstate));
1744 if (myid != GMP_get_short_id (t->peer) &&
1745 MESH_TUNNEL3_READY != t->cstate &&
1746 MESH_TUNNEL3_READY == cstate)
1749 if (MESH_TUNNEL3_KEY_OK == t->estate)
1751 LOG (GNUNET_ERROR_TYPE_DEBUG, " triggered send queued data\n");
1752 send_queued_data (t);
1754 else if (MESH_TUNNEL3_KEY_UNINITIALIZED == t->estate)
1756 LOG (GNUNET_ERROR_TYPE_DEBUG, " triggered rekey\n");
1757 rekey_tunnel (t, NULL);
1762 if (MESH_TUNNEL3_READY == cstate && 3 <= GMT_count_connections (t))
1764 GMP_stop_search (t->peer);
1769 * Change the tunnel encryption state.
1771 * @param t Tunnel whose encryption state to change.
1772 * @param state New encryption state.
1775 GMT_change_estate (struct MeshTunnel3* t, enum MeshTunnel3EState state)
1779 LOG (GNUNET_ERROR_TYPE_DEBUG,
1780 "Tunnel %s estate was %s\n",
1781 GMP_2s (t->peer), estate2s (t->estate));
1782 LOG (GNUNET_ERROR_TYPE_DEBUG,
1783 "Tunnel %s estate is now %s\n",
1784 GMP_2s (t->peer), estate2s (state));
1785 if (myid != GMP_get_short_id (t->peer) &&
1786 MESH_TUNNEL3_KEY_OK != t->estate && MESH_TUNNEL3_KEY_OK == state)
1789 send_queued_data (t);
1797 * Add a connection to a tunnel.
1800 * @param c Connection.
1803 GMT_add_connection (struct MeshTunnel3 *t, struct MeshConnection *c)
1805 struct MeshTConnection *aux;
1807 GNUNET_assert (NULL != c);
1809 for (aux = t->connection_head; aux != NULL; aux = aux->next)
1813 aux = GNUNET_new (struct MeshTConnection);
1815 GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, aux);
1820 * Mark a path as no longer valid for this tunnel: has been tried and failed.
1822 * @param t Tunnel to update.
1823 * @param path Invalid path to remove. Is destroyed after removal.
1826 GMT_remove_path (struct MeshTunnel3 *t, struct MeshPeerPath *path)
1828 GMP_remove_path (t->peer, path);
1833 * Remove a connection from a tunnel.
1836 * @param c Connection.
1839 GMT_remove_connection (struct MeshTunnel3 *t,
1840 struct MeshConnection *c)
1842 struct MeshTConnection *aux;
1843 struct MeshTConnection *next;
1845 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing connection %s from tunnel %s\n",
1846 GMC_2s (c), GMT_2s (t));
1847 for (aux = t->connection_head; aux != NULL; aux = next)
1852 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
1857 /* Start new connections if needed */
1858 if (NULL == t->connection_head
1859 && GNUNET_NO == t->destroy
1860 && GNUNET_NO == shutting_down)
1862 LOG (GNUNET_ERROR_TYPE_DEBUG, " no more connections, getting new ones\n");
1863 GMP_connect (t->peer);
1864 t->cstate = MESH_TUNNEL3_SEARCHING;
1868 /* If not marked as ready, no change is needed */
1869 if (MESH_TUNNEL3_READY != t->cstate)
1872 /* Check if any connection is ready to maintaing cstate */
1873 for (aux = t->connection_head; aux != NULL; aux = aux->next)
1874 if (MESH_CONNECTION_READY == GMC_get_state (aux->c))
1877 t->cstate = MESH_TUNNEL3_WAITING;
1882 * Add a channel to a tunnel.
1885 * @param ch Channel.
1888 GMT_add_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
1890 struct MeshTChannel *aux;
1892 GNUNET_assert (NULL != ch);
1894 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
1896 for (aux = t->channel_head; aux != NULL; aux = aux->next)
1898 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
1903 aux = GNUNET_new (struct MeshTChannel);
1905 LOG (GNUNET_ERROR_TYPE_DEBUG, " adding %p to %p\n", aux, t->channel_head);
1906 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
1908 if (GNUNET_YES == t->destroy)
1910 t->destroy = GNUNET_NO;
1911 LOG (GNUNET_ERROR_TYPE_DEBUG, " undo destroy!\n");
1917 * Remove a channel from a tunnel.
1920 * @param ch Channel.
1923 GMT_remove_channel (struct MeshTunnel3 *t, struct MeshChannel *ch)
1925 struct MeshTChannel *aux;
1927 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
1928 for (aux = t->channel_head; aux != NULL; aux = aux->next)
1932 LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GMCH_2s (ch));
1933 GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
1942 * Search for a channel by global ID.
1944 * @param t Tunnel containing the channel.
1945 * @param chid Public channel number.
1947 * @return channel handler, NULL if doesn't exist
1949 struct MeshChannel *
1950 GMT_get_channel (struct MeshTunnel3 *t, MESH_ChannelNumber chid)
1952 struct MeshTChannel *iter;
1957 for (iter = t->channel_head; NULL != iter; iter = iter->next)
1959 if (GMCH_get_id (iter->ch) == chid)
1963 return NULL == iter ? NULL : iter->ch;
1968 * Tunnel is empty: destroy it.
1970 * Notifies all connections about the destruction.
1972 * @param t Tunnel to destroy.
1975 GMT_destroy_empty (struct MeshTunnel3 *t)
1977 struct MeshTConnection *iter;
1979 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s empty: destroying scheduled\n",
1981 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1983 GMC_send_destroy (iter->c);
1986 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
1988 t->estate = MESH_TUNNEL3_KEY_UNINITIALIZED;
1989 GNUNET_SCHEDULER_cancel (t->rekey_task);
1990 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
1991 GNUNET_free (t->kx_ctx);
1994 t->cstate = MESH_TUNNEL3_NEW;
1995 t->destroy = GNUNET_YES;
2000 * Destroy tunnel if empty (no more channels).
2002 * @param t Tunnel to destroy if empty.
2005 GMT_destroy_if_empty (struct MeshTunnel3 *t)
2007 if (1 < GMT_count_channels (t))
2010 GMT_destroy_empty (t);
2015 * Destroy the tunnel.
2017 * This function does not generate any warning traffic to clients or peers.
2020 * Cancel messages belonging to this tunnel queued to neighbors.
2021 * Free any allocated resources linked to the tunnel.
2023 * @param t The tunnel to destroy.
2026 GMT_destroy (struct MeshTunnel3 *t)
2028 struct MeshTConnection *iter_c;
2029 struct MeshTConnection *next_c;
2030 struct MeshTChannel *iter_ch;
2031 struct MeshTChannel *next_ch;
2038 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GMP_2s (t->peer));
2040 GNUNET_break (GNUNET_YES ==
2041 GNUNET_CONTAINER_multipeermap_remove (tunnels,
2042 GMP_get_id (t->peer), t));
2044 for (iter_c = t->connection_head; NULL != iter_c; iter_c = next_c)
2046 next_c = iter_c->next;
2047 GMC_destroy (iter_c->c);
2049 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = next_ch)
2051 next_ch = iter_ch->next;
2052 GMCH_destroy (iter_ch->ch);
2053 /* Should only happen on shutdown, but it's ok. */
2056 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2057 GMP_set_tunnel (t->peer, NULL);
2059 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
2060 GNUNET_SCHEDULER_cancel (t->rekey_task);
2067 * @brief Use the given path for the tunnel.
2068 * Update the next and prev hops (and RCs).
2069 * (Re)start the path refresh in case the tunnel is locally owned.
2071 * @param t Tunnel to update.
2072 * @param p Path to use.
2074 * @return Connection created.
2076 struct MeshConnection *
2077 GMT_use_path (struct MeshTunnel3 *t, struct MeshPeerPath *p)
2079 struct MeshConnection *c;
2080 struct GNUNET_HashCode cid;
2081 unsigned int own_pos;
2083 if (NULL == t || NULL == p)
2089 for (own_pos = 0; own_pos < p->length; own_pos++)
2091 if (p->peers[own_pos] == myid)
2094 if (own_pos > p->length - 1)
2096 GNUNET_break_op (0);
2100 GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE, &cid);
2101 c = GMC_new (&cid, t, p, own_pos);
2104 /* Path was flawed */
2107 GMT_add_connection (t, c);
2113 * Count established (ready) connections of a tunnel.
2115 * @param t Tunnel on which to count.
2117 * @return Number of connections.
2120 GMT_count_connections (struct MeshTunnel3 *t)
2122 struct MeshTConnection *iter;
2125 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2126 if (MESH_CONNECTION_DESTROYED != GMC_get_state (iter->c))
2133 * Count channels of a tunnel.
2135 * @param t Tunnel on which to count.
2137 * @return Number of channels.
2140 GMT_count_channels (struct MeshTunnel3 *t)
2142 struct MeshTChannel *iter;
2145 for (count = 0, iter = t->channel_head;
2147 iter = iter->next, count++) /* skip */;
2154 * Get the connectivity state of a tunnel.
2158 * @return Tunnel's connectivity state.
2160 enum MeshTunnel3CState
2161 GMT_get_cstate (struct MeshTunnel3 *t)
2166 return (enum MeshTunnel3CState) -1;
2173 * Get the maximum buffer space for a tunnel towards a local client.
2177 * @return Biggest buffer space offered by any channel in the tunnel.
2180 GMT_get_channels_buffer (struct MeshTunnel3 *t)
2182 struct MeshTChannel *iter;
2183 unsigned int buffer;
2184 unsigned int ch_buf;
2186 if (NULL == t->channel_head)
2188 /* Probably getting buffer for a channel create/handshake. */
2193 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2195 ch_buf = get_channel_buffer (iter);
2196 if (ch_buf > buffer)
2204 * Get the total buffer space for a tunnel for P2P traffic.
2208 * @return Buffer space offered by all connections in the tunnel.
2211 GMT_get_connections_buffer (struct MeshTunnel3 *t)
2213 struct MeshTConnection *iter;
2214 unsigned int buffer;
2217 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2219 if (GMC_get_state (iter->c) != MESH_CONNECTION_READY)
2223 buffer += get_connection_buffer (iter);
2231 * Get the tunnel's destination.
2235 * @return ID of the destination peer.
2237 const struct GNUNET_PeerIdentity *
2238 GMT_get_destination (struct MeshTunnel3 *t)
2240 return GMP_get_id (t->peer);
2245 * Get the tunnel's next free global channel ID.
2249 * @return GID of a channel free to use.
2252 GMT_get_next_chid (struct MeshTunnel3 *t)
2254 MESH_ChannelNumber chid;
2255 MESH_ChannelNumber mask;
2258 /* Set bit 30 depending on the ID relationship. Bit 31 is always 0 for GID.
2259 * If our ID is bigger or loopback tunnel, start at 0, bit 30 = 0
2260 * If peer's ID is bigger, start at 0x4... bit 30 = 1
2262 result = GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, GMP_get_id (t->peer));
2268 while (NULL != GMT_get_channel (t, t->next_chid))
2270 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
2271 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
2272 t->next_chid |= mask;
2274 chid = t->next_chid;
2275 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
2276 t->next_chid |= mask;
2283 * Send ACK on one or more channels due to buffer in connections.
2285 * @param t Channel which has some free buffer space.
2288 GMT_unchoke_channels (struct MeshTunnel3 *t)
2290 struct MeshTChannel *iter;
2291 unsigned int buffer;
2292 unsigned int channels = GMT_count_channels (t);
2293 unsigned int choked_n;
2294 struct MeshChannel *choked[channels];
2296 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_unchoke_channels on %s\n", GMT_2s (t));
2297 LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
2298 if (NULL != t->channel_head)
2299 LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
2301 /* Get buffer space */
2302 buffer = GMT_get_connections_buffer (t);
2308 /* Count and remember choked channels */
2310 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2312 if (GNUNET_NO == get_channel_allowed (iter))
2314 choked[choked_n++] = iter->ch;
2318 /* Unchoke random channels */
2319 while (0 < buffer && 0 < choked_n)
2321 unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2323 GMCH_allow_client (choked[r], GMCH_is_origin (choked[r], GNUNET_YES));
2326 choked[r] = choked[choked_n];
2332 * Send ACK on one or more connections due to buffer space to the client.
2334 * Iterates all connections of the tunnel and sends ACKs appropriately.
2339 GMT_send_connection_acks (struct MeshTunnel3 *t)
2341 struct MeshTConnection *iter;
2344 uint32_t allow_per_connection;
2346 unsigned int buffer;
2348 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel send connection ACKs on %s\n",
2357 buffer = GMT_get_channels_buffer (t);
2358 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer %u\n", buffer);
2360 /* Count connections, how many messages are already allowed */
2361 cs = GMT_count_connections (t);
2362 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2364 allowed += get_connection_allowed (iter);
2366 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowed %u\n", allowed);
2368 /* Make sure there is no overflow */
2369 if (allowed > buffer)
2374 /* Authorize connections to send more data */
2375 to_allow = buffer; /* - allowed; */
2377 for (iter = t->connection_head; NULL != iter && to_allow > 0; iter = iter->next)
2379 allow_per_connection = to_allow/cs;
2380 to_allow -= allow_per_connection;
2382 if (get_connection_allowed (iter) > 64 / 3)
2386 GMC_allow (iter->c, allow_per_connection,
2387 GMC_is_origin (iter->c, GNUNET_NO));
2390 GNUNET_break (to_allow == 0);
2395 * Cancel a previously sent message while it's in the queue.
2397 * ONLY can be called before the continuation given to the send function
2398 * is called. Once the continuation is called, the message is no longer in the
2401 * @param q Handle to the queue.
2404 GMT_cancel (struct MeshTunnel3Queue *q)
2409 /* message_sent() will be called and free q */
2411 else if (NULL != q->tqd)
2413 unqueue_data (q->tqd);
2415 if (NULL != q->cont)
2416 q->cont (q->cont_cls, NULL, q, 0, 0);
2427 * Sends an already built message on a tunnel, encrypting it and
2428 * choosing the best connection.
2430 * @param message Message to send. Function modifies it.
2431 * @param t Tunnel on which this message is transmitted.
2432 * @param force Force the tunnel to take the message (buffer overfill).
2433 * @param cont Continuation to call once message is really sent.
2434 * @param cont_cls Closure for @c cont.
2436 * @return Handle to cancel message. NULL if @c cont is NULL.
2438 struct MeshTunnel3Queue *
2439 GMT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2440 struct MeshTunnel3 *t, int force,
2441 GMT_sent cont, void *cont_cls)
2443 return send_prebuilt_message (message, t, force, cont, cont_cls, NULL);
2448 * Is the tunnel directed towards the local peer?
2452 * @return #GNUNET_YES if it is loopback.
2455 GMT_is_loopback (const struct MeshTunnel3 *t)
2457 return (myid == GMP_get_short_id (t->peer));
2462 * Is the tunnel this path already?
2467 * @return #GNUNET_YES a connection uses this path.
2470 GMT_is_path_used (const struct MeshTunnel3 *t, const struct MeshPeerPath *p)
2472 struct MeshTConnection *iter;
2474 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2475 if (GMC_get_path (iter->c) == p)
2483 * Get a cost of a path for a tunnel considering existing connections.
2486 * @param path Candidate path.
2488 * @return Cost of the path (path length + number of overlapping nodes)
2491 GMT_get_path_cost (const struct MeshTunnel3 *t,
2492 const struct MeshPeerPath *path)
2494 struct MeshTConnection *iter;
2495 const struct MeshPeerPath *aux;
2496 unsigned int overlap;
2504 GNUNET_assert (NULL != t);
2506 for (i = 0; i < path->length; i++)
2508 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2510 aux = GMC_get_path (iter->c);
2514 for (j = 0; j < aux->length; j++)
2516 if (path->peers[i] == aux->peers[j])
2524 return (path->length + overlap) * (path->score * -1);
2529 * Get the static string for the peer this tunnel is directed.
2533 * @return Static string the destination peer's ID.
2536 GMT_2s (const struct MeshTunnel3 *t)
2541 return GMP_2s (t->peer);
2546 * Log all possible info about the tunnel state.
2548 * @param t Tunnel to debug.
2551 GMT_debug (const struct MeshTunnel3 *t)
2553 struct MeshTChannel *iterch;
2554 struct MeshTConnection *iterc;
2556 LOG (GNUNET_ERROR_TYPE_DEBUG, "DEBUG TUNNEL TOWARDS %s\n", GMT_2s (t));
2557 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate %s, estate %s\n",
2558 cstate2s (t->cstate), estate2s (t->estate));
2559 LOG (GNUNET_ERROR_TYPE_DEBUG, " kx_ctx %p, rekey_task %u\n",
2560 t->kx_ctx, t->rekey_task);
2561 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq_head %p, tq_tail %p\n",
2562 t->tq_head, t->tq_tail);
2563 LOG (GNUNET_ERROR_TYPE_DEBUG, " destroy %u\n", t->destroy);
2565 LOG (GNUNET_ERROR_TYPE_DEBUG, " channels:\n");
2566 for (iterch = t->channel_head; NULL != iterch; iterch = iterch->next)
2568 LOG (GNUNET_ERROR_TYPE_DEBUG, " - %s\n", GMCH_2s (iterch->ch));
2571 LOG (GNUNET_ERROR_TYPE_DEBUG, " connections:\n");
2572 for (iterc = t->connection_head; NULL != iterc; iterc = iterc->next)
2574 LOG (GNUNET_ERROR_TYPE_DEBUG, " - %s [%u] buf: %u/%u (qn %u/%u)\n",
2575 GMC_2s (iterc->c), GMC_get_state (iterc->c),
2576 GMC_get_buffer (iterc->c, GNUNET_YES),
2577 GMC_get_buffer (iterc->c, GNUNET_NO),
2578 GMC_get_qn (iterc->c, GNUNET_YES),
2579 GMC_get_qn (iterc->c, GNUNET_NO));
2582 LOG (GNUNET_ERROR_TYPE_DEBUG, "DEBUG TUNNEL END\n");