2 This file is part of GNUnet.
3 Copyright (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 "cadet_protocol.h"
28 #include "cadet_path.h"
30 #include "gnunet-service-cadet_tunnel.h"
31 #include "gnunet-service-cadet_connection.h"
32 #include "gnunet-service-cadet_channel.h"
33 #include "gnunet-service-cadet_peer.h"
35 #define LOG(level, ...) GNUNET_log_from(level,"cadet-tun",__VA_ARGS__)
36 #define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-tun",__VA_ARGS__)
38 #define REKEY_WAIT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 5)
40 #if !defined(GNUNET_CULL_LOGGING)
41 #define DUMP_KEYS_TO_STDERR GNUNET_YES
43 #define DUMP_KEYS_TO_STDERR GNUNET_NO
46 /******************************************************************************/
47 /******************************** STRUCTS **********************************/
48 /******************************************************************************/
52 struct CadetTChannel *next;
53 struct CadetTChannel *prev;
54 struct CadetChannel *ch;
59 * Connection list and metadata.
61 struct CadetTConnection
66 struct CadetTConnection *next;
71 struct CadetTConnection *prev;
76 struct CadetConnection *c;
79 * Creation time, to keep oldest connection alive.
81 struct GNUNET_TIME_Absolute created;
84 * Connection throughput, to keep fastest connection alive.
90 * Structure used during a Key eXchange.
92 struct CadetTunnelKXCtx
95 * Encryption ("our") old "confirmed" key, for encrypting traffic sent by us
96 * end before the key exchange is finished or times out.
98 struct GNUNET_CRYPTO_SymmetricSessionKey e_key_old;
101 * Decryption ("their") old "confirmed" key, for decrypting traffic sent by
102 * the other end before the key exchange started.
104 struct GNUNET_CRYPTO_SymmetricSessionKey d_key_old;
107 * Same as @c e_key_old, for the case of two simultaneous KX.
108 * This can happen if cadet decides to start a re-key while the peer has also
109 * started its re-key (due to network delay this is impossible to avoid).
110 * In this case, the key material generated with the peer's old ephemeral
111 * *might* (but doesn't have to) be incorrect.
112 * Since no more than two re-keys can happen simultaneously, this is enough.
114 struct GNUNET_CRYPTO_SymmetricSessionKey e_key_old2;
117 * Same as @c d_key_old, for the case described in @c e_key_old2.
119 struct GNUNET_CRYPTO_SymmetricSessionKey d_key_old2;
122 * Challenge to send and expect in the PONG.
127 * When the rekey started. One minute after this the new key will be used.
129 struct GNUNET_TIME_Absolute rekey_start_time;
132 * Task for delayed destruction of the Key eXchange context, to allow delayed
133 * messages with the old key to be decrypted successfully.
135 struct GNUNET_SCHEDULER_Task * finish_task;
139 * Struct containing all information regarding a tunnel to a peer.
144 * Endpoint of the tunnel.
146 struct CadetPeer *peer;
149 * State of the tunnel connectivity.
151 enum CadetTunnelCState cstate;
154 * State of the tunnel encryption.
156 enum CadetTunnelEState estate;
159 * Key eXchange context.
161 struct CadetTunnelKXCtx *kx_ctx;
164 * Peer's ephemeral key, to recreate @c e_key and @c d_key when own ephemeral
167 struct GNUNET_CRYPTO_EcdhePublicKey peers_ephemeral_key;
170 * Encryption ("our") key. It is only "confirmed" if kx_ctx is NULL.
172 struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
175 * Decryption ("their") key. It is only "confirmed" if kx_ctx is NULL.
177 struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
180 * Task to start the rekey process.
182 struct GNUNET_SCHEDULER_Task * rekey_task;
185 * Paths that are actively used to reach the destination peer.
187 struct CadetTConnection *connection_head;
188 struct CadetTConnection *connection_tail;
191 * Next connection number.
196 * Channels inside this tunnel.
198 struct CadetTChannel *channel_head;
199 struct CadetTChannel *channel_tail;
202 * Channel ID for the next created channel.
204 CADET_ChannelNumber next_chid;
207 * Destroy flag: if true, destroy on last message.
209 struct GNUNET_SCHEDULER_Task * destroy_task;
212 * Queued messages, to transmit once tunnel gets connected.
214 struct CadetTunnelDelayed *tq_head;
215 struct CadetTunnelDelayed *tq_tail;
218 * Task to trim connections if too many are present.
220 struct GNUNET_SCHEDULER_Task * trim_connections_task;
223 * Ephemeral message in the queue (to avoid queueing more than one).
225 struct CadetConnectionQueue *ephm_h;
228 * Pong message in the queue.
230 struct CadetConnectionQueue *pong_h;
235 * Struct used to save messages in a non-ready tunnel to send once connected.
237 struct CadetTunnelDelayed
242 struct CadetTunnelDelayed *next;
243 struct CadetTunnelDelayed *prev;
248 struct CadetTunnel *t;
251 * Tunnel queue given to the channel to cancel request. Update on send_queued.
253 struct CadetTunnelQueue *tq;
258 /* struct GNUNET_MessageHeader *msg; */
263 * Handle for messages queued but not yet sent.
265 struct CadetTunnelQueue
268 * Connection queue handle, to cancel if necessary.
270 struct CadetConnectionQueue *cq;
273 * Handle in case message hasn't been given to a connection yet.
275 struct CadetTunnelDelayed *tqd;
278 * Continuation to call once sent.
283 * Closure for @c cont.
289 /******************************************************************************/
290 /******************************* GLOBALS ***********************************/
291 /******************************************************************************/
294 * Global handle to the statistics service.
296 extern struct GNUNET_STATISTICS_Handle *stats;
299 * Local peer own ID (memory efficient handle).
301 extern GNUNET_PEER_Id myid;
304 * Local peer own ID (full value).
306 extern struct GNUNET_PeerIdentity my_full_id;
310 * Don't try to recover tunnels if shutting down.
312 extern int shutting_down;
316 * Set of all tunnels, in order to trigger a new exchange on rekey.
317 * Indexed by peer's ID.
319 static struct GNUNET_CONTAINER_MultiPeerMap *tunnels;
322 * Default TTL for payload packets.
324 static unsigned long long default_ttl;
329 const static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
332 * Own ephemeral private key.
334 static struct GNUNET_CRYPTO_EcdhePrivateKey *my_ephemeral_key;
337 * Cached message used to perform a key exchange.
339 static struct GNUNET_CADET_KX_Ephemeral kx_msg;
342 * Task to generate a new ephemeral key.
344 static struct GNUNET_SCHEDULER_Task * rekey_task;
349 static struct GNUNET_TIME_Relative rekey_period;
351 /******************************************************************************/
352 /******************************** STATIC ***********************************/
353 /******************************************************************************/
356 * Get string description for tunnel connectivity state.
358 * @param cs Tunnel state.
360 * @return String representation.
363 cstate2s (enum CadetTunnelCState cs)
369 case CADET_TUNNEL_NEW:
370 return "CADET_TUNNEL_NEW";
371 case CADET_TUNNEL_SEARCHING:
372 return "CADET_TUNNEL_SEARCHING";
373 case CADET_TUNNEL_WAITING:
374 return "CADET_TUNNEL_WAITING";
375 case CADET_TUNNEL_READY:
376 return "CADET_TUNNEL_READY";
377 case CADET_TUNNEL_SHUTDOWN:
378 return "CADET_TUNNEL_SHUTDOWN";
380 SPRINTF (buf, "%u (UNKNOWN STATE)", cs);
388 * Get string description for tunnel encryption state.
390 * @param es Tunnel state.
392 * @return String representation.
395 estate2s (enum CadetTunnelEState es)
401 case CADET_TUNNEL_KEY_UNINITIALIZED:
402 return "CADET_TUNNEL_KEY_UNINITIALIZED";
403 case CADET_TUNNEL_KEY_SENT:
404 return "CADET_TUNNEL_KEY_SENT";
405 case CADET_TUNNEL_KEY_PING:
406 return "CADET_TUNNEL_KEY_PING";
407 case CADET_TUNNEL_KEY_OK:
408 return "CADET_TUNNEL_KEY_OK";
409 case CADET_TUNNEL_KEY_REKEY:
410 return "CADET_TUNNEL_KEY_REKEY";
412 SPRINTF (buf, "%u (UNKNOWN STATE)", es);
420 * @brief Check if tunnel is ready to send traffic.
422 * Tunnel must be connected and with encryption correctly set up.
424 * @param t Tunnel to check.
426 * @return #GNUNET_YES if ready, #GNUNET_NO otherwise
429 is_ready (struct CadetTunnel *t)
433 GCT_debug (t, GNUNET_ERROR_TYPE_DEBUG);
434 ready = CADET_TUNNEL_READY == t->cstate
435 && (CADET_TUNNEL_KEY_OK == t->estate
436 || CADET_TUNNEL_KEY_REKEY == t->estate);
437 ready = ready || GCT_is_loopback (t);
443 * Check if a key is invalid (NULL pointer or all 0)
445 * @param key Key to check.
447 * @return #GNUNET_YES if key is null, #GNUNET_NO if exists and is not 0.
450 is_key_null (struct GNUNET_CRYPTO_SymmetricSessionKey *key)
452 struct GNUNET_CRYPTO_SymmetricSessionKey null_key;
457 memset (&null_key, 0, sizeof (null_key));
458 if (0 == memcmp (key, &null_key, sizeof (null_key)))
465 * Ephemeral key message purpose size.
467 * @return Size of the part of the ephemeral key message that must be signed.
470 ephemeral_purpose_size (void)
472 return sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
473 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
474 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
475 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
476 sizeof (struct GNUNET_PeerIdentity);
481 * Size of the encrypted part of a ping message.
483 * @return Size of the encrypted part of a ping message.
486 ping_encryption_size (void)
488 return sizeof (uint32_t);
493 * Get the channel's buffer. ONLY FOR NON-LOOPBACK CHANNELS!!
495 * @param tch Tunnel's channel handle.
497 * @return Amount of messages the channel can still buffer towards the client.
500 get_channel_buffer (const struct CadetTChannel *tch)
504 /* If channel is incoming, is terminal in the FWD direction and fwd is YES */
505 fwd = GCCH_is_terminal (tch->ch, GNUNET_YES);
507 return GCCH_get_buffer (tch->ch, fwd);
512 * Get the channel's allowance status.
514 * @param tch Tunnel's channel handle.
516 * @return #GNUNET_YES if we allowed the client to send data to us.
519 get_channel_allowed (const struct CadetTChannel *tch)
523 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
524 fwd = GCCH_is_origin (tch->ch, GNUNET_YES);
526 return GCCH_get_allowed (tch->ch, fwd);
531 * Get the connection's buffer.
533 * @param tc Tunnel's connection handle.
535 * @return Amount of messages the connection can still buffer.
538 get_connection_buffer (const struct CadetTConnection *tc)
542 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
543 fwd = GCC_is_origin (tc->c, GNUNET_YES);
545 return GCC_get_buffer (tc->c, fwd);
550 * Get the connection's allowance.
552 * @param tc Tunnel's connection handle.
554 * @return Amount of messages we have allowed the next peer to send us.
557 get_connection_allowed (const struct CadetTConnection *tc)
561 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
562 fwd = GCC_is_origin (tc->c, GNUNET_YES);
564 return GCC_get_allowed (tc->c, fwd);
569 * Check that a ephemeral key message s well formed and correctly signed.
571 * @param t Tunnel on which the message came.
572 * @param msg The ephemeral key message.
574 * @return GNUNET_OK if message is fine, GNUNET_SYSERR otherwise.
577 check_ephemeral (struct CadetTunnel *t,
578 const struct GNUNET_CADET_KX_Ephemeral *msg)
580 /* Check message size */
581 if (ntohs (msg->header.size) != sizeof (struct GNUNET_CADET_KX_Ephemeral))
582 return GNUNET_SYSERR;
584 /* Check signature size */
585 if (ntohl (msg->purpose.size) != ephemeral_purpose_size ())
586 return GNUNET_SYSERR;
589 if (0 != memcmp (&msg->origin_identity,
590 GCP_get_id (t->peer),
591 sizeof (struct GNUNET_PeerIdentity)))
592 return GNUNET_SYSERR;
594 /* Check signature */
596 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_CADET_KX,
599 &msg->origin_identity.public_key))
600 return GNUNET_SYSERR;
607 * Select the best key to use for encryption (send), based on KX status.
609 * Normally, return the current key. If there is a KX in progress and the old
610 * key is fresh enough, return the old key.
612 * @param t Tunnel to choose the key from.
614 * @return The optimal key to encrypt/hmac outgoing traffic.
616 static const struct GNUNET_CRYPTO_SymmetricSessionKey *
617 select_key (const struct CadetTunnel *t)
619 const struct GNUNET_CRYPTO_SymmetricSessionKey *key;
621 if (NULL != t->kx_ctx
622 && NULL == t->kx_ctx->finish_task)
624 struct GNUNET_TIME_Relative age;
626 age = GNUNET_TIME_absolute_get_duration (t->kx_ctx->rekey_start_time);
627 LOG (GNUNET_ERROR_TYPE_DEBUG,
628 " key exchange in progress, started %s ago\n",
629 GNUNET_STRINGS_relative_time_to_string (age, GNUNET_YES));
630 // FIXME make duration of old keys configurable
631 if (age.rel_value_us < GNUNET_TIME_UNIT_MINUTES.rel_value_us)
633 LOG (GNUNET_ERROR_TYPE_DEBUG, " using old key\n");
634 key = &t->kx_ctx->e_key_old;
638 LOG (GNUNET_ERROR_TYPE_DEBUG, " using new key (old key too old)\n");
644 LOG (GNUNET_ERROR_TYPE_DEBUG, " no KX: using current key\n");
654 * @param plaintext Content to HMAC.
655 * @param size Size of @c plaintext.
656 * @param iv Initialization vector for the message.
657 * @param key Key to use.
658 * @param hmac[out] Destination to store the HMAC.
661 t_hmac (const void *plaintext, size_t size,
662 uint32_t iv, const struct GNUNET_CRYPTO_SymmetricSessionKey *key,
663 struct GNUNET_CADET_Hash *hmac)
665 static const char ctx[] = "cadet authentication key";
666 struct GNUNET_CRYPTO_AuthKey auth_key;
667 struct GNUNET_HashCode hash;
669 #if DUMP_KEYS_TO_STDERR
670 LOG (GNUNET_ERROR_TYPE_INFO, " HMAC with key %s\n",
671 GNUNET_h2s ((struct GNUNET_HashCode *) key));
673 GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
678 /* Two step: CADET_Hash is only 256 bits, HashCode is 512. */
679 GNUNET_CRYPTO_hmac (&auth_key, plaintext, size, &hash);
680 memcpy (hmac, &hash, sizeof (*hmac));
685 * Encrypt daforce_newest_keyta with the tunnel key.
687 * @param t Tunnel whose key to use.
688 * @param dst Destination for the encrypted data.
689 * @param src Source of the plaintext. Can overlap with @c dst.
690 * @param size Size of the plaintext.
691 * @param iv Initialization Vector to use.
692 * @param force_newest_key Force the use of the newest key, otherwise
693 * CADET will use the old key when allowed.
694 * This can happen in the case when a KX is going on
695 * and the old one hasn't expired.
698 t_encrypt (struct CadetTunnel *t, void *dst, const void *src,
699 size_t size, uint32_t iv, int force_newest_key)
701 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
702 const struct GNUNET_CRYPTO_SymmetricSessionKey *key;
705 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt start\n");
707 key = GNUNET_YES == force_newest_key ? &t->e_key : select_key (t);
708 #if DUMP_KEYS_TO_STDERR
709 LOG (GNUNET_ERROR_TYPE_INFO, " ENC with key %s\n",
710 GNUNET_h2s ((struct GNUNET_HashCode *) key));
712 GNUNET_CRYPTO_symmetric_derive_iv (&siv, key, &iv, sizeof (iv), NULL);
713 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt IV derived\n");
714 out_size = GNUNET_CRYPTO_symmetric_encrypt (src, size, key, &siv, dst);
715 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt end\n");
722 * Decrypt and verify data with the appropriate tunnel key.
724 * @param key Key to use.
725 * @param dst Destination for the plaintext.
726 * @param src Source of the encrypted data. Can overlap with @c dst.
727 * @param size Size of the encrypted data.
728 * @param iv Initialization Vector to use.
730 * @return Size of the decrypted data, -1 if an error was encountered.
733 decrypt (const struct GNUNET_CRYPTO_SymmetricSessionKey *key,
734 void *dst, const void *src, size_t size, uint32_t iv)
736 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
739 LOG (GNUNET_ERROR_TYPE_DEBUG, " decrypt start\n");
740 LOG (GNUNET_ERROR_TYPE_DEBUG, " decrypt iv\n");
741 GNUNET_CRYPTO_symmetric_derive_iv (&siv, key, &iv, sizeof (iv), NULL);
742 LOG (GNUNET_ERROR_TYPE_DEBUG, " decrypt iv done\n");
743 out_size = GNUNET_CRYPTO_symmetric_decrypt (src, size, key, &siv, dst);
744 LOG (GNUNET_ERROR_TYPE_DEBUG, " decrypt end\n");
751 * Decrypt and verify data with the most recent tunnel key.
753 * @param t Tunnel whose key to use.
754 * @param dst Destination for the plaintext.
755 * @param src Source of the encrypted data. Can overlap with @c dst.
756 * @param size Size of the encrypted data.
757 * @param iv Initialization Vector to use.
759 * @return Size of the decrypted data, -1 if an error was encountered.
762 t_decrypt (struct CadetTunnel *t, void *dst, const void *src,
763 size_t size, uint32_t iv)
767 #if DUMP_KEYS_TO_STDERR
768 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt with %s\n",
769 GNUNET_h2s ((struct GNUNET_HashCode *) &t->d_key));
771 if (CADET_TUNNEL_KEY_UNINITIALIZED == t->estate)
773 GNUNET_STATISTICS_update (stats, "# non decryptable data", 1, GNUNET_NO);
774 LOG (GNUNET_ERROR_TYPE_WARNING,
775 "got data on %s without a valid key\n",
777 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
781 out_size = decrypt (&t->d_key, dst, src, size, iv);
788 * Decrypt and verify data with the appropriate tunnel key and verify that the
789 * data has not been altered since it was sent by the remote peer.
791 * @param t Tunnel whose key to use.
792 * @param dst Destination for the plaintext.
793 * @param src Source of the encrypted data. Can overlap with @c dst.
794 * @param size Size of the encrypted data.
795 * @param iv Initialization Vector to use.
796 * @param msg_hmac HMAC of the message, cannot be NULL.
798 * @return Size of the decrypted data, -1 if an error was encountered.
801 t_decrypt_and_validate (struct CadetTunnel *t,
802 void *dst, const void *src,
803 size_t size, uint32_t iv,
804 const struct GNUNET_CADET_Hash *msg_hmac)
806 struct GNUNET_CRYPTO_SymmetricSessionKey *key;
807 struct GNUNET_CADET_Hash hmac;
810 /* Try primary (newest) key */
812 decrypted_size = decrypt (key, dst, src, size, iv);
813 t_hmac (src, size, iv, key, &hmac);
814 if (0 == memcmp (msg_hmac, &hmac, sizeof (hmac)))
815 return decrypted_size;
817 /* If no key exchange is going on, we just failed. */
818 if (NULL == t->kx_ctx)
820 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
821 "Failed checksum validation on tunnel %s with no KX\n",
823 GNUNET_STATISTICS_update (stats, "# wrong HMAC no KX", 1, GNUNET_NO);
827 /* Try secondary key, from previous KX period. */
828 key = &t->kx_ctx->d_key_old;
829 decrypted_size = decrypt (key, dst, src, size, iv);
830 t_hmac (src, size, iv, key, &hmac);
831 if (0 == memcmp (msg_hmac, &hmac, sizeof (hmac)))
832 return decrypted_size;
834 /* Hail Mary, try tertiary, key, in case of parallel re-keys. */
835 key = &t->kx_ctx->d_key_old2;
836 decrypted_size = decrypt (key, dst, src, size, iv);
837 t_hmac (src, size, iv, key, &hmac);
838 if (0 == memcmp (msg_hmac, &hmac, sizeof (hmac)))
839 return decrypted_size;
841 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
842 "Failed checksum validation on tunnel %s with KX\n",
844 GNUNET_STATISTICS_update (stats, "# wrong HMAC with KX", 1, GNUNET_NO);
849 * Decrypt and verify data with the appropriate tunnel key and verify that the
850 * data has not been altered since it was sent by the remote peer.
852 * @param t Tunnel whose key to use.
853 * @param dst Destination for the plaintext.
854 * @param src Source of the encrypted data. Can overlap with @c dst.
855 * @param size Size of the encrypted data.
856 * @param msg_hmac HMAC of the message, cannot be NULL.
858 * @return Size of the decrypted data, -1 if an error was encountered.
861 t_ax_decrypt_and_validate (struct CadetTunnel *t,
862 void *dst, const void *src, size_t size,
863 const struct GNUNET_CADET_Hash *msg_hmac)
870 * Create key material by doing ECDH on the local and remote ephemeral keys.
872 * @param key_material Where to store the key material.
873 * @param ephemeral_key Peer's public ephemeral key.
876 derive_key_material (struct GNUNET_HashCode *key_material,
877 const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key)
880 GNUNET_CRYPTO_ecc_ecdh (my_ephemeral_key,
890 * Create a symmetic key from the identities of both ends and the key material
893 * @param key Destination for the generated key.
894 * @param sender ID of the peer that will encrypt with @c key.
895 * @param receiver ID of the peer that will decrypt with @c key.
896 * @param key_material Hash created with ECDH with the ephemeral keys.
899 derive_symmertic (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
900 const struct GNUNET_PeerIdentity *sender,
901 const struct GNUNET_PeerIdentity *receiver,
902 const struct GNUNET_HashCode *key_material)
904 const char salt[] = "CADET kx salt";
906 GNUNET_CRYPTO_kdf (key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
908 key_material, sizeof (struct GNUNET_HashCode),
909 sender, sizeof (struct GNUNET_PeerIdentity),
910 receiver, sizeof (struct GNUNET_PeerIdentity),
916 * Derive the tunnel's keys using our own and the peer's ephemeral keys.
918 * @param t Tunnel for which to create the keys.
921 create_keys (struct CadetTunnel *t)
923 struct GNUNET_HashCode km;
925 derive_key_material (&km, &t->peers_ephemeral_key);
926 derive_symmertic (&t->e_key, &my_full_id, GCP_get_id (t->peer), &km);
927 derive_symmertic (&t->d_key, GCP_get_id (t->peer), &my_full_id, &km);
928 #if DUMP_KEYS_TO_STDERR
929 LOG (GNUNET_ERROR_TYPE_INFO, "ME: %s\n",
930 GNUNET_h2s ((struct GNUNET_HashCode *) &kx_msg.ephemeral_key));
931 LOG (GNUNET_ERROR_TYPE_INFO, "PE: %s\n",
932 GNUNET_h2s ((struct GNUNET_HashCode *) &t->peers_ephemeral_key));
933 LOG (GNUNET_ERROR_TYPE_INFO, "KM: %s\n", GNUNET_h2s (&km));
934 LOG (GNUNET_ERROR_TYPE_INFO, "EK: %s\n",
935 GNUNET_h2s ((struct GNUNET_HashCode *) &t->e_key));
936 LOG (GNUNET_ERROR_TYPE_INFO, "DK: %s\n",
937 GNUNET_h2s ((struct GNUNET_HashCode *) &t->d_key));
943 * Create a new Key eXchange context for the tunnel.
945 * If the old keys were verified, keep them for old traffic. Create a new KX
946 * timestamp and a new nonce.
948 * @param t Tunnel for which to create the KX ctx.
951 create_kx_ctx (struct CadetTunnel *t)
953 LOG (GNUNET_ERROR_TYPE_INFO, " new kx ctx for %s\n", GCT_2s (t));
955 if (NULL != t->kx_ctx)
957 if (NULL != t->kx_ctx->finish_task)
959 LOG (GNUNET_ERROR_TYPE_INFO, " resetting exisiting finish task\n");
960 GNUNET_SCHEDULER_cancel (t->kx_ctx->finish_task);
961 t->kx_ctx->finish_task = NULL;
966 t->kx_ctx = GNUNET_new (struct CadetTunnelKXCtx);
967 t->kx_ctx->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
971 if (CADET_TUNNEL_KEY_OK == t->estate)
973 LOG (GNUNET_ERROR_TYPE_INFO, " backing up keys\n");
974 t->kx_ctx->d_key_old = t->d_key;
975 t->kx_ctx->e_key_old = t->e_key;
978 LOG (GNUNET_ERROR_TYPE_INFO, " old keys not valid, not saving\n");
979 t->kx_ctx->rekey_start_time = GNUNET_TIME_absolute_get ();
985 * @brief Finish the Key eXchange and destroy the old keys.
987 * @param cls Closure (Tunnel for which to finish the KX).
988 * @param tc Task context.
991 finish_kx (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
993 struct CadetTunnel *t = cls;
995 LOG (GNUNET_ERROR_TYPE_INFO, "finish KX for %s\n", GCT_2s (t));
997 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
999 LOG (GNUNET_ERROR_TYPE_INFO, " shutdown\n");
1003 GNUNET_free (t->kx_ctx);
1009 * Destroy a Key eXchange context for the tunnel. This function only schedules
1010 * the destruction, the freeing of the memory (and clearing of old key material)
1011 * happens after a delay!
1013 * @param t Tunnel whose KX ctx to destroy.
1016 destroy_kx_ctx (struct CadetTunnel *t)
1018 struct GNUNET_TIME_Relative delay;
1020 if (NULL == t->kx_ctx || NULL != t->kx_ctx->finish_task)
1023 if (is_key_null (&t->kx_ctx->e_key_old))
1025 t->kx_ctx->finish_task = GNUNET_SCHEDULER_add_now (finish_kx, t);
1029 delay = GNUNET_TIME_relative_divide (rekey_period, 4);
1030 delay = GNUNET_TIME_relative_min (delay, GNUNET_TIME_UNIT_MINUTES);
1032 t->kx_ctx->finish_task = GNUNET_SCHEDULER_add_delayed (delay, finish_kx, t);
1038 * Pick a connection on which send the next data message.
1040 * @param t Tunnel on which to send the message.
1042 * @return The connection on which to send the next message.
1044 static struct CadetConnection *
1045 tunnel_get_connection (struct CadetTunnel *t)
1047 struct CadetTConnection *iter;
1048 struct CadetConnection *best;
1050 unsigned int lowest_q;
1052 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GCT_2s (t));
1054 lowest_q = UINT_MAX;
1055 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1057 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
1058 GCC_2s (iter->c), GCC_get_state (iter->c));
1059 if (CADET_CONNECTION_READY == GCC_get_state (iter->c))
1061 qn = GCC_get_qn (iter->c, GCC_is_origin (iter->c, GNUNET_YES));
1062 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
1070 LOG (GNUNET_ERROR_TYPE_DEBUG, " selected: connection %s\n", GCC_2s (best));
1076 * Callback called when a queued message is sent.
1078 * Calculates the average time and connection packet tracking.
1080 * @param cls Closure (TunnelQueue handle).
1081 * @param c Connection this message was on.
1082 * @param q Connection queue handle (unused).
1083 * @param type Type of message sent.
1084 * @param fwd Was this a FWD going message?
1085 * @param size Size of the message.
1088 tun_message_sent (void *cls,
1089 struct CadetConnection *c,
1090 struct CadetConnectionQueue *q,
1091 uint16_t type, int fwd, size_t size)
1093 struct CadetTunnelQueue *qt = cls;
1094 struct CadetTunnel *t;
1096 LOG (GNUNET_ERROR_TYPE_DEBUG, "tun_message_sent\n");
1098 GNUNET_assert (NULL != qt->cont);
1099 t = NULL == c ? NULL : GCC_get_tunnel (c);
1100 qt->cont (qt->cont_cls, t, qt, type, size);
1106 count_queued_data (const struct CadetTunnel *t)
1108 struct CadetTunnelDelayed *iter;
1111 for (count = 0, iter = t->tq_head; iter != NULL; iter = iter->next)
1118 * Delete a queued message: either was sent or the channel was destroyed
1119 * before the tunnel's key exchange had a chance to finish.
1121 * @param tqd Delayed queue handle.
1124 unqueue_data (struct CadetTunnelDelayed *tqd)
1126 GNUNET_CONTAINER_DLL_remove (tqd->t->tq_head, tqd->t->tq_tail, tqd);
1132 * Cache a message to be sent once tunnel is online.
1134 * @param t Tunnel to hold the message.
1135 * @param msg Message itself (copy will be made).
1137 static struct CadetTunnelDelayed *
1138 queue_data (struct CadetTunnel *t, const struct GNUNET_MessageHeader *msg)
1140 struct CadetTunnelDelayed *tqd;
1141 uint16_t size = ntohs (msg->size);
1143 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue data on Tunnel %s\n", GCT_2s (t));
1145 if (GNUNET_YES == is_ready (t))
1151 tqd = GNUNET_malloc (sizeof (struct CadetTunnelDelayed) + size);
1154 memcpy (&tqd[1], msg, size);
1155 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tqd);
1161 * Sends an already built message on a tunnel, encrypting it and
1162 * choosing the best connection.
1164 * @param message Message to send. Function modifies it.
1165 * @param t Tunnel on which this message is transmitted.
1166 * @param c Connection to use (autoselect if NULL).
1167 * @param force Force the tunnel to take the message (buffer overfill).
1168 * @param cont Continuation to call once message is really sent.
1169 * @param cont_cls Closure for @c cont.
1170 * @param existing_q In case this a transmission of previously queued data,
1171 * this should be TunnelQueue given to the client.
1174 * @return Handle to cancel message.
1175 * NULL if @c cont is NULL or an error happens and message is dropped.
1177 static struct CadetTunnelQueue *
1178 send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1179 struct CadetTunnel *t, struct CadetConnection *c,
1180 int force, GCT_sent cont, void *cont_cls,
1181 struct CadetTunnelQueue *existing_q)
1183 struct CadetTunnelQueue *tq;
1184 struct GNUNET_CADET_Encrypted *msg;
1185 size_t size = ntohs (message->size);
1186 char cbuf[sizeof (struct GNUNET_CADET_Encrypted) + size];
1192 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GCT_2s (t));
1194 if (GNUNET_NO == is_ready (t))
1196 struct CadetTunnelDelayed *tqd;
1197 /* A non null existing_q indicates sending of queued data.
1198 * Should only happen after tunnel becomes ready.
1200 GNUNET_assert (NULL == existing_q);
1201 tqd = queue_data (t, message);
1204 tq = GNUNET_new (struct CadetTunnelQueue);
1208 tq->cont_cls = cont_cls;
1212 GNUNET_assert (GNUNET_NO == GCT_is_loopback (t));
1214 iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1215 msg = (struct GNUNET_CADET_Encrypted *) cbuf;
1216 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED);
1218 GNUNET_assert (t_encrypt (t, &msg[1], message, size, iv, GNUNET_NO) == size);
1219 t_hmac (&msg[1], size, iv, select_key (t), &msg->hmac);
1220 msg->header.size = htons (sizeof (struct GNUNET_CADET_Encrypted) + size);
1223 c = tunnel_get_connection (t);
1226 /* Why is tunnel 'ready'? Should have been queued! */
1227 if (NULL != t->destroy_task)
1230 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
1232 return NULL; /* Drop... */
1236 type = ntohs (message->type);
1239 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1240 case GNUNET_MESSAGE_TYPE_CADET_DATA_ACK:
1241 if (GNUNET_MESSAGE_TYPE_CADET_DATA == type)
1242 mid = ntohl (((struct GNUNET_CADET_Data *) message)->mid);
1244 mid = ntohl (((struct GNUNET_CADET_DataACK *) message)->mid);
1246 case GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE:
1247 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1248 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1249 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_ACK:
1250 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_NACK:
1251 msg->cid = *GCC_get_id (c);
1252 msg->ttl = htonl (default_ttl);
1256 LOG (GNUNET_ERROR_TYPE_ERROR, "type %s not valid\n", GC_m2s (type));
1258 LOG (GNUNET_ERROR_TYPE_DEBUG, "type %s\n", GC_m2s (type));
1260 fwd = GCC_is_origin (c, GNUNET_YES);
1264 GNUNET_break (NULL == GCC_send_prebuilt_message (&msg->header, type, mid, c,
1265 fwd, force, NULL, NULL));
1268 if (NULL == existing_q)
1270 tq = GNUNET_new (struct CadetTunnelQueue); /* FIXME valgrind: leak*/
1277 tq->cq = GCC_send_prebuilt_message (&msg->header, type, mid, c, fwd, force,
1278 &tun_message_sent, tq);
1279 GNUNET_assert (NULL != tq->cq);
1281 tq->cont_cls = cont_cls;
1288 * Send all cached messages that we can, tunnel is online.
1290 * @param t Tunnel that holds the messages. Cannot be loopback.
1293 send_queued_data (struct CadetTunnel *t)
1295 struct CadetTunnelDelayed *tqd;
1296 struct CadetTunnelDelayed *next;
1299 LOG (GNUNET_ERROR_TYPE_INFO, "Send queued data, tunnel %s\n", GCT_2s (t));
1301 if (GCT_is_loopback (t))
1307 if (GNUNET_NO == is_ready (t))
1309 LOG (GNUNET_ERROR_TYPE_DEBUG, " not ready yet: %s/%s\n",
1310 estate2s (t->estate), cstate2s (t->cstate));
1314 room = GCT_get_connections_buffer (t);
1315 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
1316 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq head: %p\n", t->tq_head);
1317 for (tqd = t->tq_head; NULL != tqd && room > 0; tqd = next)
1319 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending queued data\n");
1322 send_prebuilt_message ((struct GNUNET_MessageHeader *) &tqd[1],
1323 tqd->t, NULL, GNUNET_YES,
1324 NULL != tqd->tq ? tqd->tq->cont : NULL,
1325 NULL != tqd->tq ? tqd->tq->cont_cls : NULL,
1329 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_send_queued_data end\n", GCP_2s (t->peer));
1334 * Callback called when a queued message is sent.
1336 * @param cls Closure.
1337 * @param c Connection this message was on.
1338 * @param type Type of message sent.
1339 * @param fwd Was this a FWD going message?
1340 * @param size Size of the message.
1343 ephm_sent (void *cls,
1344 struct CadetConnection *c,
1345 struct CadetConnectionQueue *q,
1346 uint16_t type, int fwd, size_t size)
1348 struct CadetTunnel *t = cls;
1349 LOG (GNUNET_ERROR_TYPE_DEBUG, "ephm_sent %s\n", GC_m2s (type));
1354 * Callback called when a queued message is sent.
1356 * @param cls Closure.
1357 * @param c Connection this message was on.
1358 * @param type Type of message sent.
1359 * @param fwd Was this a FWD going message?
1360 * @param size Size of the message.
1363 pong_sent (void *cls,
1364 struct CadetConnection *c,
1365 struct CadetConnectionQueue *q,
1366 uint16_t type, int fwd, size_t size)
1368 struct CadetTunnel *t = cls;
1369 LOG (GNUNET_ERROR_TYPE_DEBUG, "pong_sent %s\n", GC_m2s (type));
1375 * Sends key exchange message on a tunnel, choosing the best connection.
1376 * Should not be called on loopback tunnels.
1378 * @param t Tunnel on which this message is transmitted.
1379 * @param message Message to send. Function modifies it.
1381 * @return Handle to the message in the connection queue.
1383 static struct CadetConnectionQueue *
1384 send_kx (struct CadetTunnel *t,
1385 const struct GNUNET_MessageHeader *message)
1387 struct CadetConnection *c;
1388 struct GNUNET_CADET_KX *msg;
1389 size_t size = ntohs (message->size);
1390 char cbuf[sizeof (struct GNUNET_CADET_KX) + size];
1395 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT KX on Tunnel %s\n", GCT_2s (t));
1397 /* Avoid loopback. */
1398 if (GCT_is_loopback (t))
1400 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback!\n");
1404 type = ntohs (message->type);
1406 /* Even if tunnel is "being destroyed", send anyway.
1407 * Could be a response to a rekey initiated by remote peer,
1408 * who is trying to create a new channel!
1411 /* Must have a connection, or be looking for one. */
1412 if (NULL == t->connection_head)
1414 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s while no connection\n", GC_m2s (type));
1415 if (CADET_TUNNEL_SEARCHING != t->cstate)
1418 GCT_debug (t, GNUNET_ERROR_TYPE_ERROR);
1419 GCP_debug (t->peer, GNUNET_ERROR_TYPE_ERROR);
1424 msg = (struct GNUNET_CADET_KX *) cbuf;
1425 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX);
1426 msg->header.size = htons (sizeof (struct GNUNET_CADET_KX) + size);
1427 c = tunnel_get_connection (t);
1430 if (NULL == t->destroy_task
1431 && CADET_TUNNEL_READY == t->cstate)
1434 GCT_debug (t, GNUNET_ERROR_TYPE_ERROR);
1440 case GNUNET_MESSAGE_TYPE_CADET_KX_EPHEMERAL:
1441 GNUNET_assert (NULL == t->ephm_h);
1443 memcpy (&msg[1], message, size);
1445 case GNUNET_MESSAGE_TYPE_CADET_KX_PONG:
1446 GNUNET_assert (NULL == t->pong_h);
1448 memcpy (&msg[1], message, size);
1452 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n", GC_m2s (type));
1456 fwd = GCC_is_origin (t->connection_head->c, GNUNET_YES);
1458 return GCC_send_prebuilt_message (&msg->header, type, 0, c,
1465 * Send the ephemeral key on a tunnel.
1467 * @param t Tunnel on which to send the key.
1470 send_ephemeral (struct CadetTunnel *t)
1472 LOG (GNUNET_ERROR_TYPE_INFO, "===> EPHM for %s\n", GCT_2s (t));
1473 if (NULL != t->ephm_h)
1475 LOG (GNUNET_ERROR_TYPE_INFO, " already queued\n");
1479 kx_msg.sender_status = htonl (t->estate);
1480 kx_msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1481 kx_msg.nonce = t->kx_ctx->challenge;
1482 LOG (GNUNET_ERROR_TYPE_DEBUG, " send nonce c %u\n", kx_msg.nonce);
1483 t_encrypt (t, &kx_msg.nonce, &kx_msg.nonce,
1484 ping_encryption_size(), kx_msg.iv, GNUNET_YES);
1485 LOG (GNUNET_ERROR_TYPE_DEBUG, " send nonce e %u\n", kx_msg.nonce);
1486 t->ephm_h = send_kx (t, &kx_msg.header);
1491 * Send a pong message on a tunnel.
1493 * @param t Tunnel on which to send the pong.
1494 * @param challenge Value sent in the ping that we have to send back.
1497 send_pong (struct CadetTunnel *t, uint32_t challenge)
1499 struct GNUNET_CADET_KX_Pong msg;
1501 LOG (GNUNET_ERROR_TYPE_INFO, "===> PONG for %s\n", GCT_2s (t));
1502 if (NULL != t->pong_h)
1504 LOG (GNUNET_ERROR_TYPE_INFO, " already queued\n");
1507 msg.header.size = htons (sizeof (msg));
1508 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX_PONG);
1509 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1510 msg.nonce = challenge;
1511 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
1512 t_encrypt (t, &msg.nonce, &msg.nonce,
1513 sizeof (msg.nonce), msg.iv, GNUNET_YES);
1514 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
1516 t->pong_h = send_kx (t, &msg.header);
1521 * Initiate a rekey with the remote peer.
1523 * @param cls Closure (tunnel).
1524 * @param tc TaskContext.
1527 rekey_tunnel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1529 struct CadetTunnel *t = cls;
1531 t->rekey_task = NULL;
1533 LOG (GNUNET_ERROR_TYPE_INFO, "Re-key Tunnel %s\n", GCT_2s (t));
1534 if (NULL != tc && 0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1537 GNUNET_assert (NULL != t->kx_ctx);
1538 struct GNUNET_TIME_Relative duration;
1540 duration = GNUNET_TIME_absolute_get_duration (t->kx_ctx->rekey_start_time);
1541 LOG (GNUNET_ERROR_TYPE_DEBUG, " kx started %s ago\n",
1542 GNUNET_STRINGS_relative_time_to_string (duration, GNUNET_YES));
1544 // FIXME make duration of old keys configurable
1545 if (duration.rel_value_us >= GNUNET_TIME_UNIT_MINUTES.rel_value_us)
1547 LOG (GNUNET_ERROR_TYPE_DEBUG, " deleting old keys\n");
1548 memset (&t->kx_ctx->d_key_old, 0, sizeof (t->kx_ctx->d_key_old));
1549 memset (&t->kx_ctx->e_key_old, 0, sizeof (t->kx_ctx->e_key_old));
1556 case CADET_TUNNEL_KEY_UNINITIALIZED:
1557 GCT_change_estate (t, CADET_TUNNEL_KEY_SENT);
1560 case CADET_TUNNEL_KEY_SENT:
1563 case CADET_TUNNEL_KEY_OK:
1565 * - state should have changed during rekey_iterator
1566 * - task should have been canceled at pong_handle
1569 GCT_change_estate (t, CADET_TUNNEL_KEY_REKEY);
1572 case CADET_TUNNEL_KEY_PING:
1573 case CADET_TUNNEL_KEY_REKEY:
1577 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unexpected state %u\n", t->estate);
1580 // FIXME exponential backoff
1581 struct GNUNET_TIME_Relative delay;
1583 delay = GNUNET_TIME_relative_divide (rekey_period, 16);
1584 delay = GNUNET_TIME_relative_min (delay, REKEY_WAIT);
1585 LOG (GNUNET_ERROR_TYPE_DEBUG, " next call in %s\n",
1586 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
1587 t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
1592 * Our ephemeral key has changed, create new session key on all tunnels.
1594 * Each tunnel will start the Key Exchange with a random delay between
1595 * 0 and number_of_tunnels*100 milliseconds, so there are 10 key exchanges
1596 * per second, on average.
1598 * @param cls Closure (size of the hashmap).
1599 * @param key Current public key.
1600 * @param value Value in the hash map (tunnel).
1602 * @return #GNUNET_YES, so we should continue to iterate,
1605 rekey_iterator (void *cls,
1606 const struct GNUNET_PeerIdentity *key,
1609 struct CadetTunnel *t = value;
1610 struct GNUNET_TIME_Relative delay;
1611 long n = (long) cls;
1614 if (NULL != t->rekey_task)
1617 if (GNUNET_YES == GCT_is_loopback (t))
1620 r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, (uint32_t) n * 100);
1621 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, r);
1622 t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
1624 GCT_change_estate (t, CADET_TUNNEL_KEY_REKEY);
1631 * Create a new ephemeral key and key message, schedule next rekeying.
1633 * @param cls Closure (unused).
1634 * @param tc TaskContext.
1637 rekey (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1639 struct GNUNET_TIME_Absolute time;
1644 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1647 GNUNET_free_non_null (my_ephemeral_key);
1648 my_ephemeral_key = GNUNET_CRYPTO_ecdhe_key_create ();
1650 time = GNUNET_TIME_absolute_get ();
1651 kx_msg.creation_time = GNUNET_TIME_absolute_hton (time);
1652 time = GNUNET_TIME_absolute_add (time, rekey_period);
1653 time = GNUNET_TIME_absolute_add (time, GNUNET_TIME_UNIT_MINUTES);
1654 kx_msg.expiration_time = GNUNET_TIME_absolute_hton (time);
1655 GNUNET_CRYPTO_ecdhe_key_get_public (my_ephemeral_key, &kx_msg.ephemeral_key);
1656 LOG (GNUNET_ERROR_TYPE_INFO, "GLOBAL RE-KEY, NEW EPHM: %s\n",
1657 GNUNET_h2s ((struct GNUNET_HashCode *) &kx_msg.ephemeral_key));
1659 GNUNET_assert (GNUNET_OK ==
1660 GNUNET_CRYPTO_eddsa_sign (my_private_key,
1662 &kx_msg.signature));
1664 n = (long) GNUNET_CONTAINER_multipeermap_size (tunnels);
1665 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &rekey_iterator, (void *) n);
1667 rekey_task = GNUNET_SCHEDULER_add_delayed (rekey_period, &rekey, NULL);
1672 * Called only on shutdown, destroy every tunnel.
1674 * @param cls Closure (unused).
1675 * @param key Current public key.
1676 * @param value Value in the hash map (tunnel).
1678 * @return #GNUNET_YES, so we should continue to iterate,
1681 destroy_iterator (void *cls,
1682 const struct GNUNET_PeerIdentity *key,
1685 struct CadetTunnel *t = value;
1687 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_shutdown destroying tunnel at %p\n", t);
1694 * Notify remote peer that we don't know a channel he is talking about,
1695 * probably CHANNEL_DESTROY was missed.
1697 * @param t Tunnel on which to notify.
1698 * @param gid ID of the channel.
1701 send_channel_destroy (struct CadetTunnel *t, unsigned int gid)
1703 struct GNUNET_CADET_ChannelManage msg;
1705 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY);
1706 msg.header.size = htons (sizeof (msg));
1707 msg.chid = htonl (gid);
1709 LOG (GNUNET_ERROR_TYPE_DEBUG,
1710 "WARNING destroying unknown channel %u on tunnel %s\n",
1712 send_prebuilt_message (&msg.header, t, NULL, GNUNET_YES, NULL, NULL, NULL);
1717 * Demultiplex data per channel and call appropriate channel handler.
1719 * @param t Tunnel on which the data came.
1720 * @param msg Data message.
1721 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1722 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1723 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1724 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1727 handle_data (struct CadetTunnel *t,
1728 const struct GNUNET_CADET_Data *msg,
1731 struct CadetChannel *ch;
1735 size = ntohs (msg->header.size);
1737 sizeof (struct GNUNET_CADET_Data) +
1738 sizeof (struct GNUNET_MessageHeader))
1743 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
1744 GC_m2s (ntohs (msg[1].header.type)));
1747 ch = GCT_get_channel (t, ntohl (msg->chid));
1750 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
1752 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel 0x%X unknown\n",
1754 send_channel_destroy (t, ntohl (msg->chid));
1758 GCCH_handle_data (ch, msg, fwd);
1763 * Demultiplex data ACKs per channel and update appropriate channel buffer info.
1765 * @param t Tunnel on which the DATA ACK came.
1766 * @param msg DATA ACK message.
1767 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1768 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1769 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1770 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1773 handle_data_ack (struct CadetTunnel *t,
1774 const struct GNUNET_CADET_DataACK *msg,
1777 struct CadetChannel *ch;
1781 size = ntohs (msg->header.size);
1782 if (size != sizeof (struct GNUNET_CADET_DataACK))
1789 ch = GCT_get_channel (t, ntohl (msg->chid));
1792 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
1794 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1799 GCCH_handle_data_ack (ch, msg, fwd);
1804 * Handle channel create.
1806 * @param t Tunnel on which the data came.
1807 * @param msg Data message.
1810 handle_ch_create (struct CadetTunnel *t,
1811 const struct GNUNET_CADET_ChannelCreate *msg)
1813 struct CadetChannel *ch;
1817 size = ntohs (msg->header.size);
1818 if (size != sizeof (struct GNUNET_CADET_ChannelCreate))
1825 ch = GCT_get_channel (t, ntohl (msg->chid));
1826 if (NULL != ch && ! GCT_is_loopback (t))
1828 /* Probably a retransmission, safe to ignore */
1829 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
1831 ch = GCCH_handle_create (t, msg);
1833 GCT_add_channel (t, ch);
1839 * Handle channel NACK: check correctness and call channel handler for NACKs.
1841 * @param t Tunnel on which the NACK came.
1842 * @param msg NACK message.
1845 handle_ch_nack (struct CadetTunnel *t,
1846 const struct GNUNET_CADET_ChannelManage *msg)
1848 struct CadetChannel *ch;
1852 size = ntohs (msg->header.size);
1853 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
1860 ch = GCT_get_channel (t, ntohl (msg->chid));
1863 GNUNET_STATISTICS_update (stats, "# channel NACK on unknown channel",
1865 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1870 GCCH_handle_nack (ch);
1875 * Handle a CHANNEL ACK (SYNACK/ACK).
1877 * @param t Tunnel on which the CHANNEL ACK came.
1878 * @param msg CHANNEL ACK message.
1879 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1880 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1881 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1882 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1885 handle_ch_ack (struct CadetTunnel *t,
1886 const struct GNUNET_CADET_ChannelManage *msg,
1889 struct CadetChannel *ch;
1893 size = ntohs (msg->header.size);
1894 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
1901 ch = GCT_get_channel (t, ntohl (msg->chid));
1904 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
1906 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1911 GCCH_handle_ack (ch, msg, fwd);
1916 * Handle a channel destruction message.
1918 * @param t Tunnel on which the message came.
1919 * @param msg Channel destroy message.
1920 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1921 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1922 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1923 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1926 handle_ch_destroy (struct CadetTunnel *t,
1927 const struct GNUNET_CADET_ChannelManage *msg,
1930 struct CadetChannel *ch;
1934 size = ntohs (msg->header.size);
1935 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
1942 ch = GCT_get_channel (t, ntohl (msg->chid));
1945 /* Probably a retransmission, safe to ignore */
1949 GCCH_handle_destroy (ch, msg, fwd);
1954 * The peer's ephemeral key has changed: update the symmetrical keys.
1956 * @param t Tunnel this message came on.
1957 * @param msg Key eXchange message.
1960 handle_ephemeral (struct CadetTunnel *t,
1961 const struct GNUNET_CADET_KX_Ephemeral *msg)
1963 LOG (GNUNET_ERROR_TYPE_INFO, "<=== EPHM for %s\n", GCT_2s (t));
1965 if (GNUNET_OK != check_ephemeral (t, msg))
1967 GNUNET_break_op (0);
1972 * If the key is different from what we know, derive the new E/D keys.
1973 * Else destroy the rekey ctx (duplicate EPHM after successful KX).
1975 if (0 != memcmp (&t->peers_ephemeral_key, &msg->ephemeral_key,
1976 sizeof (msg->ephemeral_key)))
1978 #if DUMP_KEYS_TO_STDERR
1979 LOG (GNUNET_ERROR_TYPE_INFO, "OLD: %s\n",
1980 GNUNET_h2s ((struct GNUNET_HashCode *) &t->peers_ephemeral_key));
1981 LOG (GNUNET_ERROR_TYPE_INFO, "NEW: %s\n",
1982 GNUNET_h2s ((struct GNUNET_HashCode *) &msg->ephemeral_key));
1984 t->peers_ephemeral_key = msg->ephemeral_key;
1988 if (CADET_TUNNEL_KEY_OK == t->estate)
1990 GCT_change_estate (t, CADET_TUNNEL_KEY_REKEY);
1992 if (NULL != t->rekey_task)
1993 GNUNET_SCHEDULER_cancel (t->rekey_task);
1994 t->rekey_task = GNUNET_SCHEDULER_add_now (rekey_tunnel, t);
1996 if (CADET_TUNNEL_KEY_SENT == t->estate)
1998 LOG (GNUNET_ERROR_TYPE_DEBUG, " our key was sent, sending challenge\n");
2000 GCT_change_estate (t, CADET_TUNNEL_KEY_PING);
2003 if (CADET_TUNNEL_KEY_UNINITIALIZED != ntohl(msg->sender_status))
2007 LOG (GNUNET_ERROR_TYPE_DEBUG, " recv nonce e %u\n", msg->nonce);
2008 t_decrypt (t, &nonce, &msg->nonce, ping_encryption_size (), msg->iv);
2009 LOG (GNUNET_ERROR_TYPE_DEBUG, " recv nonce c %u\n", nonce);
2010 send_pong (t, nonce);
2016 * Peer has answer to our challenge.
2017 * If answer is successful, consider the key exchange finished and clean
2018 * up all related state.
2020 * @param t Tunnel this message came on.
2021 * @param msg Key eXchange Pong message.
2024 handle_pong (struct CadetTunnel *t,
2025 const struct GNUNET_CADET_KX_Pong *msg)
2029 LOG (GNUNET_ERROR_TYPE_INFO, "<=== PONG for %s\n", GCT_2s (t));
2030 if (NULL == t->rekey_task)
2032 GNUNET_STATISTICS_update (stats, "# duplicate PONG messages", 1, GNUNET_NO);
2035 if (NULL == t->kx_ctx)
2037 GNUNET_STATISTICS_update (stats, "# stray PONG messages", 1, GNUNET_NO);
2041 t_decrypt (t, &challenge, &msg->nonce, sizeof (uint32_t), msg->iv);
2042 if (challenge != t->kx_ctx->challenge)
2044 LOG (GNUNET_ERROR_TYPE_WARNING, "Wrong PONG challenge on %s\n", GCT_2s (t));
2045 LOG (GNUNET_ERROR_TYPE_DEBUG, "PONG: %u (e: %u). Expected: %u.\n",
2046 challenge, msg->nonce, t->kx_ctx->challenge);
2050 GNUNET_SCHEDULER_cancel (t->rekey_task);
2051 t->rekey_task = NULL;
2053 /* Don't free the old keys right away, but after a delay.
2054 * Rationale: the KX could have happened over a very fast connection,
2055 * with payload traffic still signed with the old key stuck in a slower
2057 * Don't keep the keys longer than 1/4 the rekey period, and no longer than
2061 GCT_change_estate (t, CADET_TUNNEL_KEY_OK);
2066 * Demultiplex by message type and call appropriate handler for a message
2067 * towards a channel of a local tunnel.
2069 * @param t Tunnel this message came on.
2070 * @param msgh Message header.
2071 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2072 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2073 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2074 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2077 handle_decrypted (struct CadetTunnel *t,
2078 const struct GNUNET_MessageHeader *msgh,
2083 type = ntohs (msgh->type);
2084 LOG (GNUNET_ERROR_TYPE_INFO, "<=== %s on %s\n", GC_m2s (type), GCT_2s (t));
2088 case GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE:
2089 /* Do nothing, connection aleady got updated. */
2090 GNUNET_STATISTICS_update (stats, "# keepalives received", 1, GNUNET_NO);
2093 case GNUNET_MESSAGE_TYPE_CADET_DATA:
2094 /* Don't send hop ACK, wait for client to ACK */
2095 handle_data (t, (struct GNUNET_CADET_Data *) msgh, fwd);
2098 case GNUNET_MESSAGE_TYPE_CADET_DATA_ACK:
2099 handle_data_ack (t, (struct GNUNET_CADET_DataACK *) msgh, fwd);
2102 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
2103 handle_ch_create (t,
2104 (struct GNUNET_CADET_ChannelCreate *) msgh);
2107 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_NACK:
2109 (struct GNUNET_CADET_ChannelManage *) msgh);
2112 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_ACK:
2114 (struct GNUNET_CADET_ChannelManage *) msgh,
2118 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
2119 handle_ch_destroy (t,
2120 (struct GNUNET_CADET_ChannelManage *) msgh,
2125 GNUNET_break_op (0);
2126 LOG (GNUNET_ERROR_TYPE_WARNING,
2127 "end-to-end message not known (%u)\n",
2128 ntohs (msgh->type));
2129 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
2133 /******************************************************************************/
2134 /******************************** API ***********************************/
2135 /******************************************************************************/
2137 * Decrypt old format and demultiplex by message type. Call appropriate handler
2138 * for a message towards a channel of a local tunnel.
2140 * @param t Tunnel this message came on.
2141 * @param msg Message header.
2144 GCT_handle_encrypted (struct CadetTunnel *t,
2145 const struct GNUNET_MessageHeader *msg)
2147 size_t size = ntohs (msg->size);
2148 size_t payload_size;
2151 uint16_t type = ntohs (msg->type);
2152 struct GNUNET_MessageHeader *msgh;
2155 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == type)
2157 const struct GNUNET_CADET_Encrypted *emsg;
2159 emsg = (struct GNUNET_CADET_Encrypted *) msg;
2160 payload_size = size - sizeof (struct GNUNET_CADET_Encrypted);
2161 decrypted_size = t_decrypt_and_validate (t, cbuf, &emsg[1], payload_size,
2162 emsg->iv, &emsg->hmac);
2164 else if (GNUNET_MESSAGE_TYPE_CADET_AX == type)
2166 const struct GNUNET_CADET_AX *emsg;
2168 emsg = (struct GNUNET_CADET_AX *) msg;
2169 payload_size = size - sizeof (struct GNUNET_CADET_AX);
2170 decrypted_size = t_ax_decrypt_and_validate (t, cbuf, &emsg[1],
2171 payload_size, &emsg->hmac);
2174 if (-1 == decrypted_size)
2176 GNUNET_break_op (0);
2181 while (off < decrypted_size)
2185 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
2186 msize = ntohs (msgh->size);
2187 if (msize < sizeof (struct GNUNET_MessageHeader))
2189 GNUNET_break_op (0);
2192 handle_decrypted (t, msgh, GNUNET_SYSERR);
2199 * Demultiplex an encapsulated KX message by message type.
2201 * @param t Tunnel on which the message came.
2202 * @param message Payload of KX message.
2205 GCT_handle_kx (struct CadetTunnel *t,
2206 const struct GNUNET_MessageHeader *message)
2210 type = ntohs (message->type);
2211 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message received\n", type);
2214 case GNUNET_MESSAGE_TYPE_CADET_KX_EPHEMERAL:
2215 handle_ephemeral (t, (struct GNUNET_CADET_KX_Ephemeral *) message);
2218 case GNUNET_MESSAGE_TYPE_CADET_KX_PONG:
2219 handle_pong (t, (struct GNUNET_CADET_KX_Pong *) message);
2223 GNUNET_break_op (0);
2224 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message not known (%u)\n", type);
2230 * Initialize the tunnel subsystem.
2232 * @param c Configuration handle.
2233 * @param key ECC private key, to derive all other keys and do crypto.
2236 GCT_init (const struct GNUNET_CONFIGURATION_Handle *c,
2237 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
2239 int expected_overhead;
2241 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
2243 expected_overhead = 0;
2244 expected_overhead += sizeof (struct GNUNET_CADET_Encrypted);
2245 expected_overhead += sizeof (struct GNUNET_CADET_Data);
2246 expected_overhead += sizeof (struct GNUNET_CADET_ACK);
2247 GNUNET_assert (GNUNET_CONSTANTS_CADET_P2P_OVERHEAD == expected_overhead);
2250 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DEFAULT_TTL",
2253 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
2254 "CADET", "DEFAULT_TTL", "USING DEFAULT");
2258 GNUNET_CONFIGURATION_get_value_time (c, "CADET", "REKEY_PERIOD",
2261 rekey_period = GNUNET_TIME_UNIT_DAYS;
2264 my_private_key = key;
2265 kx_msg.header.size = htons (sizeof (kx_msg));
2266 kx_msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX_EPHEMERAL);
2267 kx_msg.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CADET_KX);
2268 kx_msg.purpose.size = htonl (ephemeral_purpose_size ());
2269 kx_msg.origin_identity = my_full_id;
2270 rekey_task = GNUNET_SCHEDULER_add_now (&rekey, NULL);
2272 tunnels = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
2277 * Shut down the tunnel subsystem.
2282 if (NULL != rekey_task)
2284 GNUNET_SCHEDULER_cancel (rekey_task);
2287 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &destroy_iterator, NULL);
2288 GNUNET_CONTAINER_multipeermap_destroy (tunnels);
2295 * @param destination Peer this tunnel is towards.
2297 struct CadetTunnel *
2298 GCT_new (struct CadetPeer *destination)
2300 struct CadetTunnel *t;
2302 t = GNUNET_new (struct CadetTunnel);
2304 t->peer = destination;
2307 GNUNET_CONTAINER_multipeermap_put (tunnels, GCP_get_id (destination), t,
2308 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2319 * Change the tunnel's connection state.
2321 * @param t Tunnel whose connection state to change.
2322 * @param cstate New connection state.
2325 GCT_change_cstate (struct CadetTunnel* t, enum CadetTunnelCState cstate)
2329 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s cstate %s => %s\n",
2330 GCP_2s (t->peer), cstate2s (t->cstate), cstate2s (cstate));
2331 if (myid != GCP_get_short_id (t->peer) &&
2332 CADET_TUNNEL_READY != t->cstate &&
2333 CADET_TUNNEL_READY == cstate)
2336 if (CADET_TUNNEL_KEY_OK == t->estate)
2338 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered send queued data\n");
2339 send_queued_data (t);
2341 else if (CADET_TUNNEL_KEY_UNINITIALIZED == t->estate)
2343 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered rekey\n");
2344 if (NULL != t->rekey_task)
2345 GNUNET_SCHEDULER_cancel (t->rekey_task);
2347 rekey_tunnel (t, NULL);
2352 if (CADET_TUNNEL_READY == cstate
2353 && CONNECTIONS_PER_TUNNEL <= GCT_count_connections (t))
2355 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered stop dht\n");
2356 GCP_stop_search (t->peer);
2362 * Change the tunnel encryption state.
2364 * @param t Tunnel whose encryption state to change, or NULL.
2365 * @param state New encryption state.
2368 GCT_change_estate (struct CadetTunnel* t, enum CadetTunnelEState state)
2370 enum CadetTunnelEState old;
2377 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s estate was %s\n",
2378 GCP_2s (t->peer), estate2s (old));
2379 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s estate is now %s\n",
2380 GCP_2s (t->peer), estate2s (t->estate));
2382 /* Send queued data if enc state changes to OK */
2383 if (myid != GCP_get_short_id (t->peer) &&
2384 CADET_TUNNEL_KEY_OK != old && CADET_TUNNEL_KEY_OK == t->estate)
2386 send_queued_data (t);
2392 * @brief Check if tunnel has too many connections, and remove one if necessary.
2394 * Currently this means the newest connection, unless it is a direct one.
2395 * Implemented as a task to avoid freeing a connection that is in the middle
2396 * of being created/processed.
2398 * @param cls Closure (Tunnel to check).
2399 * @param tc Task context.
2402 trim_connections (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2404 struct CadetTunnel *t = cls;
2406 t->trim_connections_task = NULL;
2408 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2411 if (GCT_count_connections (t) > 2 * CONNECTIONS_PER_TUNNEL)
2413 struct CadetTConnection *iter;
2414 struct CadetTConnection *c;
2416 for (c = iter = t->connection_head; NULL != iter; iter = iter->next)
2418 if ((iter->created.abs_value_us > c->created.abs_value_us)
2419 && GNUNET_NO == GCC_is_direct (iter->c))
2426 LOG (GNUNET_ERROR_TYPE_DEBUG, "Too many connections on tunnel %s\n",
2428 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying connection %s\n",
2441 * Add a connection to a tunnel.
2444 * @param c Connection.
2447 GCT_add_connection (struct CadetTunnel *t, struct CadetConnection *c)
2449 struct CadetTConnection *aux;
2451 GNUNET_assert (NULL != c);
2453 LOG (GNUNET_ERROR_TYPE_DEBUG, "add connection %s\n", GCC_2s (c));
2454 LOG (GNUNET_ERROR_TYPE_DEBUG, " to tunnel %s\n", GCT_2s (t));
2455 for (aux = t->connection_head; aux != NULL; aux = aux->next)
2459 aux = GNUNET_new (struct CadetTConnection);
2461 aux->created = GNUNET_TIME_absolute_get ();
2463 GNUNET_CONTAINER_DLL_insert (t->connection_head, t->connection_tail, aux);
2465 if (CADET_TUNNEL_SEARCHING == t->cstate)
2466 GCT_change_estate (t, CADET_TUNNEL_WAITING);
2468 if (NULL != t->trim_connections_task)
2469 t->trim_connections_task = GNUNET_SCHEDULER_add_now (&trim_connections, t);
2474 * Remove a connection from a tunnel.
2477 * @param c Connection.
2480 GCT_remove_connection (struct CadetTunnel *t,
2481 struct CadetConnection *c)
2483 struct CadetTConnection *aux;
2484 struct CadetTConnection *next;
2487 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing connection %s from tunnel %s\n",
2488 GCC_2s (c), GCT_2s (t));
2489 for (aux = t->connection_head; aux != NULL; aux = next)
2494 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
2499 conns = GCT_count_connections (t);
2501 && NULL == t->destroy_task
2502 && CADET_TUNNEL_SHUTDOWN != t->cstate
2503 && GNUNET_NO == shutting_down)
2505 if (0 == GCT_count_any_connections (t))
2506 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2508 GCT_change_cstate (t, CADET_TUNNEL_WAITING);
2511 /* Start new connections if needed */
2512 if (CONNECTIONS_PER_TUNNEL > conns
2513 && NULL == t->destroy_task
2514 && CADET_TUNNEL_SHUTDOWN != t->cstate
2515 && GNUNET_NO == shutting_down)
2517 LOG (GNUNET_ERROR_TYPE_DEBUG, " too few connections, getting new ones\n");
2518 GCP_connect (t->peer); /* Will change cstate to WAITING when possible */
2522 /* If not marked as ready, no change is needed */
2523 if (CADET_TUNNEL_READY != t->cstate)
2526 /* Check if any connection is ready to maintain cstate */
2527 for (aux = t->connection_head; aux != NULL; aux = aux->next)
2528 if (CADET_CONNECTION_READY == GCC_get_state (aux->c))
2534 * Add a channel to a tunnel.
2537 * @param ch Channel.
2540 GCT_add_channel (struct CadetTunnel *t, struct CadetChannel *ch)
2542 struct CadetTChannel *aux;
2544 GNUNET_assert (NULL != ch);
2546 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
2548 for (aux = t->channel_head; aux != NULL; aux = aux->next)
2550 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
2555 aux = GNUNET_new (struct CadetTChannel);
2557 LOG (GNUNET_ERROR_TYPE_DEBUG, " adding %p to %p\n", aux, t->channel_head);
2558 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
2560 if (NULL != t->destroy_task)
2562 GNUNET_SCHEDULER_cancel (t->destroy_task);
2563 t->destroy_task = NULL;
2564 LOG (GNUNET_ERROR_TYPE_DEBUG, " undo destroy!\n");
2570 * Remove a channel from a tunnel.
2573 * @param ch Channel.
2576 GCT_remove_channel (struct CadetTunnel *t, struct CadetChannel *ch)
2578 struct CadetTChannel *aux;
2580 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
2581 for (aux = t->channel_head; aux != NULL; aux = aux->next)
2585 LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GCCH_2s (ch));
2586 GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
2595 * Search for a channel by global ID.
2597 * @param t Tunnel containing the channel.
2598 * @param chid Public channel number.
2600 * @return channel handler, NULL if doesn't exist
2602 struct CadetChannel *
2603 GCT_get_channel (struct CadetTunnel *t, CADET_ChannelNumber chid)
2605 struct CadetTChannel *iter;
2610 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2612 if (GCCH_get_id (iter->ch) == chid)
2616 return NULL == iter ? NULL : iter->ch;
2621 * @brief Destroy a tunnel and free all resources.
2623 * Should only be called a while after the tunnel has been marked as destroyed,
2624 * in case there is a new channel added to the same peer shortly after marking
2625 * the tunnel. This way we avoid a new public key handshake.
2627 * @param cls Closure (tunnel to destroy).
2628 * @param tc Task context.
2631 delayed_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2633 struct CadetTunnel *t = cls;
2634 struct CadetTConnection *iter;
2636 LOG (GNUNET_ERROR_TYPE_DEBUG, "delayed destroying tunnel %p\n", t);
2637 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
2639 LOG (GNUNET_ERROR_TYPE_WARNING,
2640 "Not destroying tunnel, due to shutdown. "
2641 "Tunnel at %p should have been freed by GCT_shutdown\n", t);
2644 t->destroy_task = NULL;
2645 t->cstate = CADET_TUNNEL_SHUTDOWN;
2647 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2649 GCC_send_destroy (iter->c);
2656 * Tunnel is empty: destroy it.
2658 * Notifies all connections about the destruction.
2660 * @param t Tunnel to destroy.
2663 GCT_destroy_empty (struct CadetTunnel *t)
2665 if (GNUNET_YES == shutting_down)
2666 return; /* Will be destroyed immediately anyway */
2668 if (NULL != t->destroy_task)
2670 LOG (GNUNET_ERROR_TYPE_WARNING,
2671 "Tunnel %s is already scheduled for destruction. Tunnel debug dump:\n",
2673 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
2675 /* should never happen, tunnel can only become empty once, and the
2676 * task identifier should be NO_TASK (cleaned when the tunnel was created
2677 * or became un-empty)
2682 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s empty: scheduling destruction\n",
2685 // FIXME make delay a config option
2686 t->destroy_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
2687 &delayed_destroy, t);
2688 LOG (GNUNET_ERROR_TYPE_DEBUG, "Scheduled destroy of %p as %llu\n",
2689 t, t->destroy_task);
2694 * Destroy tunnel if empty (no more channels).
2696 * @param t Tunnel to destroy if empty.
2699 GCT_destroy_if_empty (struct CadetTunnel *t)
2701 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s destroy if empty\n", GCT_2s (t));
2702 if (0 < GCT_count_channels (t))
2705 GCT_destroy_empty (t);
2710 * Destroy the tunnel.
2712 * This function does not generate any warning traffic to clients or peers.
2715 * Cancel messages belonging to this tunnel queued to neighbors.
2716 * Free any allocated resources linked to the tunnel.
2718 * @param t The tunnel to destroy.
2721 GCT_destroy (struct CadetTunnel *t)
2723 struct CadetTConnection *iter_c;
2724 struct CadetTConnection *next_c;
2725 struct CadetTChannel *iter_ch;
2726 struct CadetTChannel *next_ch;
2731 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GCP_2s (t->peer));
2733 GNUNET_break (GNUNET_YES ==
2734 GNUNET_CONTAINER_multipeermap_remove (tunnels,
2735 GCP_get_id (t->peer), t));
2737 for (iter_c = t->connection_head; NULL != iter_c; iter_c = next_c)
2739 next_c = iter_c->next;
2740 GCC_destroy (iter_c->c);
2742 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = next_ch)
2744 next_ch = iter_ch->next;
2745 GCCH_destroy (iter_ch->ch);
2746 /* Should only happen on shutdown, but it's ok. */
2749 if (NULL != t->destroy_task)
2751 LOG (GNUNET_ERROR_TYPE_DEBUG, "cancelling dest: %llX\n", t->destroy_task);
2752 GNUNET_SCHEDULER_cancel (t->destroy_task);
2753 t->destroy_task = NULL;
2756 if (NULL != t->trim_connections_task)
2758 LOG (GNUNET_ERROR_TYPE_DEBUG, "cancelling trim: %llX\n",
2759 t->trim_connections_task);
2760 GNUNET_SCHEDULER_cancel (t->trim_connections_task);
2761 t->trim_connections_task = NULL;
2764 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2765 GCP_set_tunnel (t->peer, NULL);
2767 if (NULL != t->rekey_task)
2769 GNUNET_SCHEDULER_cancel (t->rekey_task);
2770 t->rekey_task = NULL;
2772 if (NULL != t->kx_ctx)
2774 if (NULL != t->kx_ctx->finish_task)
2775 GNUNET_SCHEDULER_cancel (t->kx_ctx->finish_task);
2776 GNUNET_free (t->kx_ctx);
2783 * @brief Use the given path for the tunnel.
2784 * Update the next and prev hops (and RCs).
2785 * (Re)start the path refresh in case the tunnel is locally owned.
2787 * @param t Tunnel to update.
2788 * @param p Path to use.
2790 * @return Connection created.
2792 struct CadetConnection *
2793 GCT_use_path (struct CadetTunnel *t, struct CadetPeerPath *p)
2795 struct CadetConnection *c;
2796 struct GNUNET_CADET_Hash cid;
2797 unsigned int own_pos;
2799 if (NULL == t || NULL == p)
2805 if (CADET_TUNNEL_SHUTDOWN == t->cstate)
2811 for (own_pos = 0; own_pos < p->length; own_pos++)
2813 if (p->peers[own_pos] == myid)
2816 if (own_pos >= p->length)
2818 GNUNET_break_op (0);
2822 GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE, &cid, sizeof (cid));
2823 c = GCC_new (&cid, t, p, own_pos);
2826 /* Path was flawed */
2829 GCT_add_connection (t, c);
2835 * Count all created connections of a tunnel. Not necessarily ready connections!
2837 * @param t Tunnel on which to count.
2839 * @return Number of connections created, either being established or ready.
2842 GCT_count_any_connections (struct CadetTunnel *t)
2844 struct CadetTConnection *iter;
2850 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2858 * Count established (ready) connections of a tunnel.
2860 * @param t Tunnel on which to count.
2862 * @return Number of connections.
2865 GCT_count_connections (struct CadetTunnel *t)
2867 struct CadetTConnection *iter;
2873 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2874 if (CADET_CONNECTION_READY == GCC_get_state (iter->c))
2882 * Count channels of a tunnel.
2884 * @param t Tunnel on which to count.
2886 * @return Number of channels.
2889 GCT_count_channels (struct CadetTunnel *t)
2891 struct CadetTChannel *iter;
2894 for (count = 0, iter = t->channel_head;
2896 iter = iter->next, count++) /* skip */;
2903 * Get the connectivity state of a tunnel.
2907 * @return Tunnel's connectivity state.
2909 enum CadetTunnelCState
2910 GCT_get_cstate (struct CadetTunnel *t)
2915 return (enum CadetTunnelCState) -1;
2922 * Get the encryption state of a tunnel.
2926 * @return Tunnel's encryption state.
2928 enum CadetTunnelEState
2929 GCT_get_estate (struct CadetTunnel *t)
2934 return (enum CadetTunnelEState) -1;
2940 * Get the maximum buffer space for a tunnel towards a local client.
2944 * @return Biggest buffer space offered by any channel in the tunnel.
2947 GCT_get_channels_buffer (struct CadetTunnel *t)
2949 struct CadetTChannel *iter;
2950 unsigned int buffer;
2951 unsigned int ch_buf;
2953 if (NULL == t->channel_head)
2955 /* Probably getting buffer for a channel create/handshake. */
2956 LOG (GNUNET_ERROR_TYPE_DEBUG, " no channels, allow max\n");
2961 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2963 ch_buf = get_channel_buffer (iter);
2964 if (ch_buf > buffer)
2972 * Get the total buffer space for a tunnel for P2P traffic.
2976 * @return Buffer space offered by all connections in the tunnel.
2979 GCT_get_connections_buffer (struct CadetTunnel *t)
2981 struct CadetTConnection *iter;
2982 unsigned int buffer;
2984 if (GNUNET_NO == is_ready (t))
2986 if (count_queued_data (t) > 3)
2993 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2995 if (GCC_get_state (iter->c) != CADET_CONNECTION_READY)
2999 buffer += get_connection_buffer (iter);
3007 * Get the tunnel's destination.
3011 * @return ID of the destination peer.
3013 const struct GNUNET_PeerIdentity *
3014 GCT_get_destination (struct CadetTunnel *t)
3016 return GCP_get_id (t->peer);
3021 * Get the tunnel's next free global channel ID.
3025 * @return GID of a channel free to use.
3028 GCT_get_next_chid (struct CadetTunnel *t)
3030 CADET_ChannelNumber chid;
3031 CADET_ChannelNumber mask;
3034 /* Set bit 30 depending on the ID relationship. Bit 31 is always 0 for GID.
3035 * If our ID is bigger or loopback tunnel, start at 0, bit 30 = 0
3036 * If peer's ID is bigger, start at 0x4... bit 30 = 1
3038 result = GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, GCP_get_id (t->peer));
3043 t->next_chid |= mask;
3045 while (NULL != GCT_get_channel (t, t->next_chid))
3047 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
3048 t->next_chid = (t->next_chid + 1) & ~GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
3049 t->next_chid |= mask;
3051 chid = t->next_chid;
3052 t->next_chid = (t->next_chid + 1) & ~GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
3053 t->next_chid |= mask;
3060 * Send ACK on one or more channels due to buffer in connections.
3062 * @param t Channel which has some free buffer space.
3065 GCT_unchoke_channels (struct CadetTunnel *t)
3067 struct CadetTChannel *iter;
3068 unsigned int buffer;
3069 unsigned int channels = GCT_count_channels (t);
3070 unsigned int choked_n;
3071 struct CadetChannel *choked[channels];
3073 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_unchoke_channels on %s\n", GCT_2s (t));
3074 LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
3075 if (NULL != t->channel_head)
3076 LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
3078 /* Get buffer space */
3079 buffer = GCT_get_connections_buffer (t);
3085 /* Count and remember choked channels */
3087 for (iter = t->channel_head; NULL != iter; iter = iter->next)
3089 if (GNUNET_NO == get_channel_allowed (iter))
3091 choked[choked_n++] = iter->ch;
3095 /* Unchoke random channels */
3096 while (0 < buffer && 0 < choked_n)
3098 unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3100 GCCH_allow_client (choked[r], GCCH_is_origin (choked[r], GNUNET_YES));
3103 choked[r] = choked[choked_n];
3109 * Send ACK on one or more connections due to buffer space to the client.
3111 * Iterates all connections of the tunnel and sends ACKs appropriately.
3116 GCT_send_connection_acks (struct CadetTunnel *t)
3118 struct CadetTConnection *iter;
3121 uint32_t allow_per_connection;
3123 unsigned int buffer;
3125 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel send connection ACKs on %s\n",
3134 if (CADET_TUNNEL_READY != t->cstate)
3137 buffer = GCT_get_channels_buffer (t);
3138 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer %u\n", buffer);
3140 /* Count connections, how many messages are already allowed */
3141 cs = GCT_count_connections (t);
3142 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
3144 allowed += get_connection_allowed (iter);
3146 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowed %u\n", allowed);
3148 /* Make sure there is no overflow */
3149 if (allowed > buffer)
3152 /* Authorize connections to send more data */
3153 to_allow = buffer - allowed;
3155 for (iter = t->connection_head;
3156 NULL != iter && to_allow > 0;
3159 if (CADET_CONNECTION_READY != GCC_get_state (iter->c)
3160 || get_connection_allowed (iter) > 64 / 3)
3164 allow_per_connection = to_allow/cs;
3165 to_allow -= allow_per_connection;
3167 GCC_allow (iter->c, allow_per_connection,
3168 GCC_is_origin (iter->c, GNUNET_NO));
3173 /* Since we don't allow if it's allowed to send 64/3, this can happen. */
3174 LOG (GNUNET_ERROR_TYPE_DEBUG, " reminding to_allow: %u\n", to_allow);
3180 * Cancel a previously sent message while it's in the queue.
3182 * ONLY can be called before the continuation given to the send function
3183 * is called. Once the continuation is called, the message is no longer in the
3186 * @param q Handle to the queue.
3189 GCT_cancel (struct CadetTunnelQueue *q)
3194 /* tun_message_sent() will be called and free q */
3196 else if (NULL != q->tqd)
3198 unqueue_data (q->tqd);
3200 if (NULL != q->cont)
3201 q->cont (q->cont_cls, NULL, q, 0, 0);
3212 * Sends an already built message on a tunnel, encrypting it and
3213 * choosing the best connection if not provided.
3215 * @param message Message to send. Function modifies it.
3216 * @param t Tunnel on which this message is transmitted.
3217 * @param c Connection to use (autoselect if NULL).
3218 * @param force Force the tunnel to take the message (buffer overfill).
3219 * @param cont Continuation to call once message is really sent.
3220 * @param cont_cls Closure for @c cont.
3222 * @return Handle to cancel message. NULL if @c cont is NULL.
3224 struct CadetTunnelQueue *
3225 GCT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
3226 struct CadetTunnel *t, struct CadetConnection *c,
3227 int force, GCT_sent cont, void *cont_cls)
3229 return send_prebuilt_message (message, t, c, force, cont, cont_cls, NULL);
3233 * Sends an already built and encrypted message on a tunnel, choosing the best
3234 * connection. Useful for re-queueing messages queued on a destroyed connection.
3236 * @param message Message to send. Function modifies it.
3237 * @param t Tunnel on which this message is transmitted.
3240 GCT_resend_message (const struct GNUNET_MessageHeader *message,
3241 struct CadetTunnel *t)
3243 struct CadetConnection *c;
3246 c = tunnel_get_connection (t);
3249 /* TODO queue in tunnel, marked as encrypted */
3250 LOG (GNUNET_ERROR_TYPE_DEBUG, "No connection available, dropping.\n");
3253 fwd = GCC_is_origin (c, GNUNET_YES);
3254 GNUNET_break (NULL == GCC_send_prebuilt_message (message, 0, 0, c, fwd,
3255 GNUNET_YES, NULL, NULL));
3260 * Is the tunnel directed towards the local peer?
3264 * @return #GNUNET_YES if it is loopback.
3267 GCT_is_loopback (const struct CadetTunnel *t)
3269 return (myid == GCP_get_short_id (t->peer));
3274 * Is the tunnel this path already?
3279 * @return #GNUNET_YES a connection uses this path.
3282 GCT_is_path_used (const struct CadetTunnel *t, const struct CadetPeerPath *p)
3284 struct CadetTConnection *iter;
3286 for (iter = t->connection_head; NULL != iter; iter = iter->next)
3287 if (path_equivalent (GCC_get_path (iter->c), p))
3295 * Get a cost of a path for a tunnel considering existing connections.
3298 * @param path Candidate path.
3300 * @return Cost of the path (path length + number of overlapping nodes)
3303 GCT_get_path_cost (const struct CadetTunnel *t,
3304 const struct CadetPeerPath *path)
3306 struct CadetTConnection *iter;
3307 const struct CadetPeerPath *aux;
3308 unsigned int overlap;
3316 GNUNET_assert (NULL != t);
3318 for (i = 0; i < path->length; i++)
3320 for (iter = t->connection_head; NULL != iter; iter = iter->next)
3322 aux = GCC_get_path (iter->c);
3326 for (j = 0; j < aux->length; j++)
3328 if (path->peers[i] == aux->peers[j])
3336 return path->length + overlap;
3341 * Get the static string for the peer this tunnel is directed.
3345 * @return Static string the destination peer's ID.
3348 GCT_2s (const struct CadetTunnel *t)
3353 return GCP_2s (t->peer);
3357 /******************************************************************************/
3358 /***************************** INFO/DEBUG *******************************/
3359 /******************************************************************************/
3362 * Log all possible info about the tunnel state.
3364 * @param t Tunnel to debug.
3365 * @param level Debug level to use.
3368 GCT_debug (const struct CadetTunnel *t, enum GNUNET_ErrorType level)
3370 struct CadetTChannel *iterch;
3371 struct CadetTConnection *iterc;
3374 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
3376 __FILE__, __FUNCTION__, __LINE__);
3380 LOG2 (level, "TTT DEBUG TUNNEL TOWARDS %s\n", GCT_2s (t));
3381 LOG2 (level, "TTT cstate %s, estate %s\n",
3382 cstate2s (t->cstate), estate2s (t->estate));
3383 LOG2 (level, "TTT kx_ctx %p, rekey_task %u, finish task %u\n",
3384 t->kx_ctx, t->rekey_task, t->kx_ctx ? t->kx_ctx->finish_task : 0);
3385 #if DUMP_KEYS_TO_STDERR
3386 LOG2 (level, "TTT my EPHM\t %s\n",
3387 GNUNET_h2s ((struct GNUNET_HashCode *) &kx_msg.ephemeral_key));
3388 LOG2 (level, "TTT peers EPHM:\t %s\n",
3389 GNUNET_h2s ((struct GNUNET_HashCode *) &t->peers_ephemeral_key));
3390 LOG2 (level, "TTT ENC key:\t %s\n",
3391 GNUNET_h2s ((struct GNUNET_HashCode *) &t->e_key));
3392 LOG2 (level, "TTT DEC key:\t %s\n",
3393 GNUNET_h2s ((struct GNUNET_HashCode *) &t->d_key));
3396 LOG2 (level, "TTT OLD ENC key:\t %s\n",
3397 GNUNET_h2s ((struct GNUNET_HashCode *) &t->kx_ctx->e_key_old));
3398 LOG2 (level, "TTT OLD DEC key:\t %s\n",
3399 GNUNET_h2s ((struct GNUNET_HashCode *) &t->kx_ctx->d_key_old));
3402 LOG2 (level, "TTT tq_head %p, tq_tail %p\n", t->tq_head, t->tq_tail);
3403 LOG2 (level, "TTT destroy %u\n", t->destroy_task);
3405 LOG2 (level, "TTT channels:\n");
3406 for (iterch = t->channel_head; NULL != iterch; iterch = iterch->next)
3408 LOG2 (level, "TTT - %s\n", GCCH_2s (iterch->ch));
3411 LOG2 (level, "TTT connections:\n");
3412 for (iterc = t->connection_head; NULL != iterc; iterc = iterc->next)
3414 GCC_debug (iterc->c, level);
3417 LOG2 (level, "TTT DEBUG TUNNEL END\n");
3422 * Iterate all tunnels.
3424 * @param iter Iterator.
3425 * @param cls Closure for @c iter.
3428 GCT_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter, void *cls)
3430 GNUNET_CONTAINER_multipeermap_iterate (tunnels, iter, cls);
3435 * Count all tunnels.
3437 * @return Number of tunnels to remote peers kept by this peer.
3440 GCT_count_all (void)
3442 return GNUNET_CONTAINER_multipeermap_size (tunnels);
3447 * Iterate all connections of a tunnel.
3449 * @param t Tunnel whose connections to iterate.
3450 * @param iter Iterator.
3451 * @param cls Closure for @c iter.
3454 GCT_iterate_connections (struct CadetTunnel *t, GCT_conn_iter iter, void *cls)
3456 struct CadetTConnection *ct;
3458 for (ct = t->connection_head; NULL != ct; ct = ct->next)
3464 * Iterate all channels of a tunnel.
3466 * @param t Tunnel whose channels to iterate.
3467 * @param iter Iterator.
3468 * @param cls Closure for @c iter.
3471 GCT_iterate_channels (struct CadetTunnel *t, GCT_chan_iter iter, void *cls)
3473 struct CadetTChannel *cht;
3475 for (cht = t->channel_head; NULL != cht; cht = cht->next)
3476 iter (cls, cht->ch);