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 CadetTunnelSkippedKey
141 struct CadetTunnelSkippedKey *next;
142 struct CadetTunnelSkippedKey *prev;
144 struct GNUNET_TIME_Absolute timestamp;
146 struct GNUNET_CRYPTO_SymmetricSessionKey HK;
147 struct GNUNET_CRYPTO_SymmetricSessionKey MK;
150 struct CadetTunnelAxolotl
152 struct CadetTunnelSkippedKey *head;
153 struct CadetTunnelSkippedKey *tail;
157 struct GNUNET_CRYPTO_SymmetricSessionKey RK;
158 struct GNUNET_CRYPTO_SymmetricSessionKey HKs;
159 struct GNUNET_CRYPTO_SymmetricSessionKey HKr;
160 struct GNUNET_CRYPTO_SymmetricSessionKey NHKs;
161 struct GNUNET_CRYPTO_SymmetricSessionKey NHKr;
162 struct GNUNET_CRYPTO_SymmetricSessionKey CKs;
163 struct GNUNET_CRYPTO_SymmetricSessionKey CKr;
165 struct GNUNET_CRYPTO_EcdhePublicKey DHRs;
166 struct GNUNET_CRYPTO_EcdhePublicKey DHRr;
176 * Struct containing all information regarding a tunnel to a peer.
181 * Endpoint of the tunnel.
183 struct CadetPeer *peer;
186 * State of the tunnel connectivity.
188 enum CadetTunnelCState cstate;
191 * State of the tunnel encryption.
193 enum CadetTunnelEState estate;
196 * Key eXchange context.
198 struct CadetTunnelKXCtx *kx_ctx;
201 * Peer's ephemeral key, to recreate @c e_key and @c d_key when own ephemeral
204 struct GNUNET_CRYPTO_EcdhePublicKey peers_ephemeral_key;
207 * Encryption ("our") key. It is only "confirmed" if kx_ctx is NULL.
209 struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
212 * Decryption ("their") key. It is only "confirmed" if kx_ctx is NULL.
214 struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
217 * Task to start the rekey process.
219 struct GNUNET_SCHEDULER_Task * rekey_task;
222 * Paths that are actively used to reach the destination peer.
224 struct CadetTConnection *connection_head;
225 struct CadetTConnection *connection_tail;
228 * Next connection number.
233 * Channels inside this tunnel.
235 struct CadetTChannel *channel_head;
236 struct CadetTChannel *channel_tail;
239 * Channel ID for the next created channel.
241 CADET_ChannelNumber next_chid;
244 * Destroy flag: if true, destroy on last message.
246 struct GNUNET_SCHEDULER_Task * destroy_task;
249 * Queued messages, to transmit once tunnel gets connected.
251 struct CadetTunnelDelayed *tq_head;
252 struct CadetTunnelDelayed *tq_tail;
255 * Task to trim connections if too many are present.
257 struct GNUNET_SCHEDULER_Task * trim_connections_task;
260 * Ephemeral message in the queue (to avoid queueing more than one).
262 struct CadetConnectionQueue *ephm_h;
265 * Pong message in the queue.
267 struct CadetConnectionQueue *pong_h;
272 * Struct used to save messages in a non-ready tunnel to send once connected.
274 struct CadetTunnelDelayed
279 struct CadetTunnelDelayed *next;
280 struct CadetTunnelDelayed *prev;
285 struct CadetTunnel *t;
288 * Tunnel queue given to the channel to cancel request. Update on send_queued.
290 struct CadetTunnelQueue *tq;
295 /* struct GNUNET_MessageHeader *msg; */
300 * Handle for messages queued but not yet sent.
302 struct CadetTunnelQueue
305 * Connection queue handle, to cancel if necessary.
307 struct CadetConnectionQueue *cq;
310 * Handle in case message hasn't been given to a connection yet.
312 struct CadetTunnelDelayed *tqd;
315 * Continuation to call once sent.
320 * Closure for @c cont.
326 /******************************************************************************/
327 /******************************* GLOBALS ***********************************/
328 /******************************************************************************/
331 * Global handle to the statistics service.
333 extern struct GNUNET_STATISTICS_Handle *stats;
336 * Local peer own ID (memory efficient handle).
338 extern GNUNET_PEER_Id myid;
341 * Local peer own ID (full value).
343 extern struct GNUNET_PeerIdentity my_full_id;
347 * Don't try to recover tunnels if shutting down.
349 extern int shutting_down;
353 * Set of all tunnels, in order to trigger a new exchange on rekey.
354 * Indexed by peer's ID.
356 static struct GNUNET_CONTAINER_MultiPeerMap *tunnels;
359 * Default TTL for payload packets.
361 static unsigned long long default_ttl;
366 const static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
369 * Own ephemeral private key.
371 static struct GNUNET_CRYPTO_EcdhePrivateKey *my_ephemeral_key;
374 * Cached message used to perform a key exchange.
376 static struct GNUNET_CADET_KX_Ephemeral kx_msg;
379 * Task to generate a new ephemeral key.
381 static struct GNUNET_SCHEDULER_Task * rekey_task;
386 static struct GNUNET_TIME_Relative rekey_period;
388 /******************************************************************************/
389 /******************************** STATIC ***********************************/
390 /******************************************************************************/
393 * Get string description for tunnel connectivity state.
395 * @param cs Tunnel state.
397 * @return String representation.
400 cstate2s (enum CadetTunnelCState cs)
406 case CADET_TUNNEL_NEW:
407 return "CADET_TUNNEL_NEW";
408 case CADET_TUNNEL_SEARCHING:
409 return "CADET_TUNNEL_SEARCHING";
410 case CADET_TUNNEL_WAITING:
411 return "CADET_TUNNEL_WAITING";
412 case CADET_TUNNEL_READY:
413 return "CADET_TUNNEL_READY";
414 case CADET_TUNNEL_SHUTDOWN:
415 return "CADET_TUNNEL_SHUTDOWN";
417 SPRINTF (buf, "%u (UNKNOWN STATE)", cs);
425 * Get string description for tunnel encryption state.
427 * @param es Tunnel state.
429 * @return String representation.
432 estate2s (enum CadetTunnelEState es)
438 case CADET_TUNNEL_KEY_UNINITIALIZED:
439 return "CADET_TUNNEL_KEY_UNINITIALIZED";
440 case CADET_TUNNEL_KEY_SENT:
441 return "CADET_TUNNEL_KEY_SENT";
442 case CADET_TUNNEL_KEY_PING:
443 return "CADET_TUNNEL_KEY_PING";
444 case CADET_TUNNEL_KEY_OK:
445 return "CADET_TUNNEL_KEY_OK";
446 case CADET_TUNNEL_KEY_REKEY:
447 return "CADET_TUNNEL_KEY_REKEY";
449 SPRINTF (buf, "%u (UNKNOWN STATE)", es);
457 * @brief Check if tunnel is ready to send traffic.
459 * Tunnel must be connected and with encryption correctly set up.
461 * @param t Tunnel to check.
463 * @return #GNUNET_YES if ready, #GNUNET_NO otherwise
466 is_ready (struct CadetTunnel *t)
470 GCT_debug (t, GNUNET_ERROR_TYPE_DEBUG);
471 ready = CADET_TUNNEL_READY == t->cstate
472 && (CADET_TUNNEL_KEY_OK == t->estate
473 || CADET_TUNNEL_KEY_REKEY == t->estate);
474 ready = ready || GCT_is_loopback (t);
480 * Check if a key is invalid (NULL pointer or all 0)
482 * @param key Key to check.
484 * @return #GNUNET_YES if key is null, #GNUNET_NO if exists and is not 0.
487 is_key_null (struct GNUNET_CRYPTO_SymmetricSessionKey *key)
489 struct GNUNET_CRYPTO_SymmetricSessionKey null_key;
494 memset (&null_key, 0, sizeof (null_key));
495 if (0 == memcmp (key, &null_key, sizeof (null_key)))
502 * Ephemeral key message purpose size.
504 * @return Size of the part of the ephemeral key message that must be signed.
507 ephemeral_purpose_size (void)
509 return sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
510 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
511 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
512 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
513 sizeof (struct GNUNET_PeerIdentity);
518 * Size of the encrypted part of a ping message.
520 * @return Size of the encrypted part of a ping message.
523 ping_encryption_size (void)
525 return sizeof (uint32_t);
530 * Get the channel's buffer. ONLY FOR NON-LOOPBACK CHANNELS!!
532 * @param tch Tunnel's channel handle.
534 * @return Amount of messages the channel can still buffer towards the client.
537 get_channel_buffer (const struct CadetTChannel *tch)
541 /* If channel is incoming, is terminal in the FWD direction and fwd is YES */
542 fwd = GCCH_is_terminal (tch->ch, GNUNET_YES);
544 return GCCH_get_buffer (tch->ch, fwd);
549 * Get the channel's allowance status.
551 * @param tch Tunnel's channel handle.
553 * @return #GNUNET_YES if we allowed the client to send data to us.
556 get_channel_allowed (const struct CadetTChannel *tch)
560 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
561 fwd = GCCH_is_origin (tch->ch, GNUNET_YES);
563 return GCCH_get_allowed (tch->ch, fwd);
568 * Get the connection's buffer.
570 * @param tc Tunnel's connection handle.
572 * @return Amount of messages the connection can still buffer.
575 get_connection_buffer (const struct CadetTConnection *tc)
579 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
580 fwd = GCC_is_origin (tc->c, GNUNET_YES);
582 return GCC_get_buffer (tc->c, fwd);
587 * Get the connection's allowance.
589 * @param tc Tunnel's connection handle.
591 * @return Amount of messages we have allowed the next peer to send us.
594 get_connection_allowed (const struct CadetTConnection *tc)
598 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
599 fwd = GCC_is_origin (tc->c, GNUNET_YES);
601 return GCC_get_allowed (tc->c, fwd);
606 * Check that a ephemeral key message s well formed and correctly signed.
608 * @param t Tunnel on which the message came.
609 * @param msg The ephemeral key message.
611 * @return GNUNET_OK if message is fine, GNUNET_SYSERR otherwise.
614 check_ephemeral (struct CadetTunnel *t,
615 const struct GNUNET_CADET_KX_Ephemeral *msg)
617 /* Check message size */
618 if (ntohs (msg->header.size) != sizeof (struct GNUNET_CADET_KX_Ephemeral))
619 return GNUNET_SYSERR;
621 /* Check signature size */
622 if (ntohl (msg->purpose.size) != ephemeral_purpose_size ())
623 return GNUNET_SYSERR;
626 if (0 != memcmp (&msg->origin_identity,
627 GCP_get_id (t->peer),
628 sizeof (struct GNUNET_PeerIdentity)))
629 return GNUNET_SYSERR;
631 /* Check signature */
633 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_CADET_KX,
636 &msg->origin_identity.public_key))
637 return GNUNET_SYSERR;
644 * Select the best key to use for encryption (send), based on KX status.
646 * Normally, return the current key. If there is a KX in progress and the old
647 * key is fresh enough, return the old key.
649 * @param t Tunnel to choose the key from.
651 * @return The optimal key to encrypt/hmac outgoing traffic.
653 static const struct GNUNET_CRYPTO_SymmetricSessionKey *
654 select_key (const struct CadetTunnel *t)
656 const struct GNUNET_CRYPTO_SymmetricSessionKey *key;
658 if (NULL != t->kx_ctx
659 && NULL == t->kx_ctx->finish_task)
661 struct GNUNET_TIME_Relative age;
663 age = GNUNET_TIME_absolute_get_duration (t->kx_ctx->rekey_start_time);
664 LOG (GNUNET_ERROR_TYPE_DEBUG,
665 " key exchange in progress, started %s ago\n",
666 GNUNET_STRINGS_relative_time_to_string (age, GNUNET_YES));
667 // FIXME make duration of old keys configurable
668 if (age.rel_value_us < GNUNET_TIME_UNIT_MINUTES.rel_value_us)
670 LOG (GNUNET_ERROR_TYPE_DEBUG, " using old key\n");
671 key = &t->kx_ctx->e_key_old;
675 LOG (GNUNET_ERROR_TYPE_DEBUG, " using new key (old key too old)\n");
681 LOG (GNUNET_ERROR_TYPE_DEBUG, " no KX: using current key\n");
691 * @param plaintext Content to HMAC.
692 * @param size Size of @c plaintext.
693 * @param iv Initialization vector for the message.
694 * @param key Key to use.
695 * @param hmac[out] Destination to store the HMAC.
698 t_hmac (const void *plaintext, size_t size,
699 uint32_t iv, const struct GNUNET_CRYPTO_SymmetricSessionKey *key,
700 struct GNUNET_CADET_Hash *hmac)
702 static const char ctx[] = "cadet authentication key";
703 struct GNUNET_CRYPTO_AuthKey auth_key;
704 struct GNUNET_HashCode hash;
706 #if DUMP_KEYS_TO_STDERR
707 LOG (GNUNET_ERROR_TYPE_INFO, " HMAC with key %s\n",
708 GNUNET_h2s ((struct GNUNET_HashCode *) key));
710 GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
715 /* Two step: CADET_Hash is only 256 bits, HashCode is 512. */
716 GNUNET_CRYPTO_hmac (&auth_key, plaintext, size, &hash);
717 memcpy (hmac, &hash, sizeof (*hmac));
722 * Encrypt daforce_newest_keyta with the tunnel key.
724 * @param t Tunnel whose key to use.
725 * @param dst Destination for the encrypted data.
726 * @param src Source of the plaintext. Can overlap with @c dst.
727 * @param size Size of the plaintext.
728 * @param iv Initialization Vector to use.
729 * @param force_newest_key Force the use of the newest key, otherwise
730 * CADET will use the old key when allowed.
731 * This can happen in the case when a KX is going on
732 * and the old one hasn't expired.
735 t_encrypt (struct CadetTunnel *t, void *dst, const void *src,
736 size_t size, uint32_t iv, int force_newest_key)
738 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
739 const struct GNUNET_CRYPTO_SymmetricSessionKey *key;
742 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt start\n");
744 key = GNUNET_YES == force_newest_key ? &t->e_key : select_key (t);
745 #if DUMP_KEYS_TO_STDERR
746 LOG (GNUNET_ERROR_TYPE_INFO, " ENC with key %s\n",
747 GNUNET_h2s ((struct GNUNET_HashCode *) key));
749 GNUNET_CRYPTO_symmetric_derive_iv (&siv, key, &iv, sizeof (iv), NULL);
750 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt IV derived\n");
751 out_size = GNUNET_CRYPTO_symmetric_encrypt (src, size, key, &siv, dst);
752 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt end\n");
759 * Decrypt and verify data with the appropriate tunnel key.
761 * @param key Key to use.
762 * @param dst Destination for the plaintext.
763 * @param src Source of the encrypted data. Can overlap with @c dst.
764 * @param size Size of the encrypted data.
765 * @param iv Initialization Vector to use.
767 * @return Size of the decrypted data, -1 if an error was encountered.
770 decrypt (const struct GNUNET_CRYPTO_SymmetricSessionKey *key,
771 void *dst, const void *src, size_t size, uint32_t iv)
773 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
776 LOG (GNUNET_ERROR_TYPE_DEBUG, " decrypt start\n");
777 LOG (GNUNET_ERROR_TYPE_DEBUG, " decrypt iv\n");
778 GNUNET_CRYPTO_symmetric_derive_iv (&siv, key, &iv, sizeof (iv), NULL);
779 LOG (GNUNET_ERROR_TYPE_DEBUG, " decrypt iv done\n");
780 out_size = GNUNET_CRYPTO_symmetric_decrypt (src, size, key, &siv, dst);
781 LOG (GNUNET_ERROR_TYPE_DEBUG, " decrypt end\n");
788 * Decrypt and verify data with the most recent tunnel key.
790 * @param t Tunnel whose key to use.
791 * @param dst Destination for the plaintext.
792 * @param src Source of the encrypted data. Can overlap with @c dst.
793 * @param size Size of the encrypted data.
794 * @param iv Initialization Vector to use.
796 * @return Size of the decrypted data, -1 if an error was encountered.
799 t_decrypt (struct CadetTunnel *t, void *dst, const void *src,
800 size_t size, uint32_t iv)
804 #if DUMP_KEYS_TO_STDERR
805 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt with %s\n",
806 GNUNET_h2s ((struct GNUNET_HashCode *) &t->d_key));
808 if (CADET_TUNNEL_KEY_UNINITIALIZED == t->estate)
810 GNUNET_STATISTICS_update (stats, "# non decryptable data", 1, GNUNET_NO);
811 LOG (GNUNET_ERROR_TYPE_WARNING,
812 "got data on %s without a valid key\n",
814 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
818 out_size = decrypt (&t->d_key, dst, src, size, iv);
825 * Decrypt and verify data with the appropriate tunnel key and verify that the
826 * data has not been altered since it was sent by the remote peer.
828 * @param t Tunnel whose key to use.
829 * @param dst Destination for the plaintext.
830 * @param src Source of the encrypted data. Can overlap with @c dst.
831 * @param size Size of the encrypted data.
832 * @param iv Initialization Vector to use.
833 * @param msg_hmac HMAC of the message, cannot be NULL.
835 * @return Size of the decrypted data, -1 if an error was encountered.
838 t_decrypt_and_validate (struct CadetTunnel *t,
839 void *dst, const void *src,
840 size_t size, uint32_t iv,
841 const struct GNUNET_CADET_Hash *msg_hmac)
843 struct GNUNET_CRYPTO_SymmetricSessionKey *key;
844 struct GNUNET_CADET_Hash hmac;
847 /* Try primary (newest) key */
849 decrypted_size = decrypt (key, dst, src, size, iv);
850 t_hmac (src, size, iv, key, &hmac);
851 if (0 == memcmp (msg_hmac, &hmac, sizeof (hmac)))
852 return decrypted_size;
854 /* If no key exchange is going on, we just failed. */
855 if (NULL == t->kx_ctx)
857 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
858 "Failed checksum validation on tunnel %s with no KX\n",
860 GNUNET_STATISTICS_update (stats, "# wrong HMAC no KX", 1, GNUNET_NO);
864 /* Try secondary key, from previous KX period. */
865 key = &t->kx_ctx->d_key_old;
866 decrypted_size = decrypt (key, dst, src, size, iv);
867 t_hmac (src, size, iv, key, &hmac);
868 if (0 == memcmp (msg_hmac, &hmac, sizeof (hmac)))
869 return decrypted_size;
871 /* Hail Mary, try tertiary, key, in case of parallel re-keys. */
872 key = &t->kx_ctx->d_key_old2;
873 decrypted_size = decrypt (key, dst, src, size, iv);
874 t_hmac (src, size, iv, key, &hmac);
875 if (0 == memcmp (msg_hmac, &hmac, sizeof (hmac)))
876 return decrypted_size;
878 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
879 "Failed checksum validation on tunnel %s with KX\n",
881 GNUNET_STATISTICS_update (stats, "# wrong HMAC with KX", 1, GNUNET_NO);
886 * Decrypt and verify data with the appropriate tunnel key and verify that the
887 * data has not been altered since it was sent by the remote peer.
889 * @param t Tunnel whose key to use.
890 * @param dst Destination for the plaintext.
891 * @param src Source of the encrypted data. Can overlap with @c dst.
892 * @param size Size of the encrypted data.
893 * @param msg_hmac HMAC of the message, cannot be NULL.
895 * @return Size of the decrypted data, -1 if an error was encountered.
898 t_ax_decrypt_and_validate (struct CadetTunnel *t,
899 void *dst, const void *src, size_t size,
900 const struct GNUNET_CADET_Hash *msg_hmac)
907 * Create key material by doing ECDH on the local and remote ephemeral keys.
909 * @param key_material Where to store the key material.
910 * @param ephemeral_key Peer's public ephemeral key.
913 derive_key_material (struct GNUNET_HashCode *key_material,
914 const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key)
917 GNUNET_CRYPTO_ecc_ecdh (my_ephemeral_key,
927 * Create a symmetic key from the identities of both ends and the key material
930 * @param key Destination for the generated key.
931 * @param sender ID of the peer that will encrypt with @c key.
932 * @param receiver ID of the peer that will decrypt with @c key.
933 * @param key_material Hash created with ECDH with the ephemeral keys.
936 derive_symmertic (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
937 const struct GNUNET_PeerIdentity *sender,
938 const struct GNUNET_PeerIdentity *receiver,
939 const struct GNUNET_HashCode *key_material)
941 const char salt[] = "CADET kx salt";
943 GNUNET_CRYPTO_kdf (key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
945 key_material, sizeof (struct GNUNET_HashCode),
946 sender, sizeof (struct GNUNET_PeerIdentity),
947 receiver, sizeof (struct GNUNET_PeerIdentity),
953 * Derive the tunnel's keys using our own and the peer's ephemeral keys.
955 * @param t Tunnel for which to create the keys.
958 create_keys (struct CadetTunnel *t)
960 struct GNUNET_HashCode km;
962 derive_key_material (&km, &t->peers_ephemeral_key);
963 derive_symmertic (&t->e_key, &my_full_id, GCP_get_id (t->peer), &km);
964 derive_symmertic (&t->d_key, GCP_get_id (t->peer), &my_full_id, &km);
965 #if DUMP_KEYS_TO_STDERR
966 LOG (GNUNET_ERROR_TYPE_INFO, "ME: %s\n",
967 GNUNET_h2s ((struct GNUNET_HashCode *) &kx_msg.ephemeral_key));
968 LOG (GNUNET_ERROR_TYPE_INFO, "PE: %s\n",
969 GNUNET_h2s ((struct GNUNET_HashCode *) &t->peers_ephemeral_key));
970 LOG (GNUNET_ERROR_TYPE_INFO, "KM: %s\n", GNUNET_h2s (&km));
971 LOG (GNUNET_ERROR_TYPE_INFO, "EK: %s\n",
972 GNUNET_h2s ((struct GNUNET_HashCode *) &t->e_key));
973 LOG (GNUNET_ERROR_TYPE_INFO, "DK: %s\n",
974 GNUNET_h2s ((struct GNUNET_HashCode *) &t->d_key));
980 * Create a new Key eXchange context for the tunnel.
982 * If the old keys were verified, keep them for old traffic. Create a new KX
983 * timestamp and a new nonce.
985 * @param t Tunnel for which to create the KX ctx.
988 create_kx_ctx (struct CadetTunnel *t)
990 LOG (GNUNET_ERROR_TYPE_INFO, " new kx ctx for %s\n", GCT_2s (t));
992 if (NULL != t->kx_ctx)
994 if (NULL != t->kx_ctx->finish_task)
996 LOG (GNUNET_ERROR_TYPE_INFO, " resetting exisiting finish task\n");
997 GNUNET_SCHEDULER_cancel (t->kx_ctx->finish_task);
998 t->kx_ctx->finish_task = NULL;
1003 t->kx_ctx = GNUNET_new (struct CadetTunnelKXCtx);
1004 t->kx_ctx->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1008 if (CADET_TUNNEL_KEY_OK == t->estate)
1010 LOG (GNUNET_ERROR_TYPE_INFO, " backing up keys\n");
1011 t->kx_ctx->d_key_old = t->d_key;
1012 t->kx_ctx->e_key_old = t->e_key;
1015 LOG (GNUNET_ERROR_TYPE_INFO, " old keys not valid, not saving\n");
1016 t->kx_ctx->rekey_start_time = GNUNET_TIME_absolute_get ();
1022 * @brief Finish the Key eXchange and destroy the old keys.
1024 * @param cls Closure (Tunnel for which to finish the KX).
1025 * @param tc Task context.
1028 finish_kx (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1030 struct CadetTunnel *t = cls;
1032 LOG (GNUNET_ERROR_TYPE_INFO, "finish KX for %s\n", GCT_2s (t));
1034 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1036 LOG (GNUNET_ERROR_TYPE_INFO, " shutdown\n");
1040 GNUNET_free (t->kx_ctx);
1046 * Destroy a Key eXchange context for the tunnel. This function only schedules
1047 * the destruction, the freeing of the memory (and clearing of old key material)
1048 * happens after a delay!
1050 * @param t Tunnel whose KX ctx to destroy.
1053 destroy_kx_ctx (struct CadetTunnel *t)
1055 struct GNUNET_TIME_Relative delay;
1057 if (NULL == t->kx_ctx || NULL != t->kx_ctx->finish_task)
1060 if (is_key_null (&t->kx_ctx->e_key_old))
1062 t->kx_ctx->finish_task = GNUNET_SCHEDULER_add_now (finish_kx, t);
1066 delay = GNUNET_TIME_relative_divide (rekey_period, 4);
1067 delay = GNUNET_TIME_relative_min (delay, GNUNET_TIME_UNIT_MINUTES);
1069 t->kx_ctx->finish_task = GNUNET_SCHEDULER_add_delayed (delay, finish_kx, t);
1075 * Pick a connection on which send the next data message.
1077 * @param t Tunnel on which to send the message.
1079 * @return The connection on which to send the next message.
1081 static struct CadetConnection *
1082 tunnel_get_connection (struct CadetTunnel *t)
1084 struct CadetTConnection *iter;
1085 struct CadetConnection *best;
1087 unsigned int lowest_q;
1089 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GCT_2s (t));
1091 lowest_q = UINT_MAX;
1092 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1094 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
1095 GCC_2s (iter->c), GCC_get_state (iter->c));
1096 if (CADET_CONNECTION_READY == GCC_get_state (iter->c))
1098 qn = GCC_get_qn (iter->c, GCC_is_origin (iter->c, GNUNET_YES));
1099 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
1107 LOG (GNUNET_ERROR_TYPE_DEBUG, " selected: connection %s\n", GCC_2s (best));
1113 * Callback called when a queued message is sent.
1115 * Calculates the average time and connection packet tracking.
1117 * @param cls Closure (TunnelQueue handle).
1118 * @param c Connection this message was on.
1119 * @param q Connection queue handle (unused).
1120 * @param type Type of message sent.
1121 * @param fwd Was this a FWD going message?
1122 * @param size Size of the message.
1125 tun_message_sent (void *cls,
1126 struct CadetConnection *c,
1127 struct CadetConnectionQueue *q,
1128 uint16_t type, int fwd, size_t size)
1130 struct CadetTunnelQueue *qt = cls;
1131 struct CadetTunnel *t;
1133 LOG (GNUNET_ERROR_TYPE_DEBUG, "tun_message_sent\n");
1135 GNUNET_assert (NULL != qt->cont);
1136 t = NULL == c ? NULL : GCC_get_tunnel (c);
1137 qt->cont (qt->cont_cls, t, qt, type, size);
1143 count_queued_data (const struct CadetTunnel *t)
1145 struct CadetTunnelDelayed *iter;
1148 for (count = 0, iter = t->tq_head; iter != NULL; iter = iter->next)
1155 * Delete a queued message: either was sent or the channel was destroyed
1156 * before the tunnel's key exchange had a chance to finish.
1158 * @param tqd Delayed queue handle.
1161 unqueue_data (struct CadetTunnelDelayed *tqd)
1163 GNUNET_CONTAINER_DLL_remove (tqd->t->tq_head, tqd->t->tq_tail, tqd);
1169 * Cache a message to be sent once tunnel is online.
1171 * @param t Tunnel to hold the message.
1172 * @param msg Message itself (copy will be made).
1174 static struct CadetTunnelDelayed *
1175 queue_data (struct CadetTunnel *t, const struct GNUNET_MessageHeader *msg)
1177 struct CadetTunnelDelayed *tqd;
1178 uint16_t size = ntohs (msg->size);
1180 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue data on Tunnel %s\n", GCT_2s (t));
1182 if (GNUNET_YES == is_ready (t))
1188 tqd = GNUNET_malloc (sizeof (struct CadetTunnelDelayed) + size);
1191 memcpy (&tqd[1], msg, size);
1192 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tqd);
1198 * Sends an already built message on a tunnel, encrypting it and
1199 * choosing the best connection.
1201 * @param message Message to send. Function modifies it.
1202 * @param t Tunnel on which this message is transmitted.
1203 * @param c Connection to use (autoselect if NULL).
1204 * @param force Force the tunnel to take the message (buffer overfill).
1205 * @param cont Continuation to call once message is really sent.
1206 * @param cont_cls Closure for @c cont.
1207 * @param existing_q In case this a transmission of previously queued data,
1208 * this should be TunnelQueue given to the client.
1211 * @return Handle to cancel message.
1212 * NULL if @c cont is NULL or an error happens and message is dropped.
1214 static struct CadetTunnelQueue *
1215 send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1216 struct CadetTunnel *t, struct CadetConnection *c,
1217 int force, GCT_sent cont, void *cont_cls,
1218 struct CadetTunnelQueue *existing_q)
1220 struct CadetTunnelQueue *tq;
1221 struct GNUNET_CADET_Encrypted *msg;
1222 size_t size = ntohs (message->size);
1223 char cbuf[sizeof (struct GNUNET_CADET_Encrypted) + size];
1229 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GCT_2s (t));
1231 if (GNUNET_NO == is_ready (t))
1233 struct CadetTunnelDelayed *tqd;
1234 /* A non null existing_q indicates sending of queued data.
1235 * Should only happen after tunnel becomes ready.
1237 GNUNET_assert (NULL == existing_q);
1238 tqd = queue_data (t, message);
1241 tq = GNUNET_new (struct CadetTunnelQueue);
1245 tq->cont_cls = cont_cls;
1249 GNUNET_assert (GNUNET_NO == GCT_is_loopback (t));
1251 iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1252 msg = (struct GNUNET_CADET_Encrypted *) cbuf;
1253 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED);
1255 GNUNET_assert (t_encrypt (t, &msg[1], message, size, iv, GNUNET_NO) == size);
1256 t_hmac (&msg[1], size, iv, select_key (t), &msg->hmac);
1257 msg->header.size = htons (sizeof (struct GNUNET_CADET_Encrypted) + size);
1260 c = tunnel_get_connection (t);
1263 /* Why is tunnel 'ready'? Should have been queued! */
1264 if (NULL != t->destroy_task)
1267 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
1269 return NULL; /* Drop... */
1273 type = ntohs (message->type);
1276 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1277 case GNUNET_MESSAGE_TYPE_CADET_DATA_ACK:
1278 if (GNUNET_MESSAGE_TYPE_CADET_DATA == type)
1279 mid = ntohl (((struct GNUNET_CADET_Data *) message)->mid);
1281 mid = ntohl (((struct GNUNET_CADET_DataACK *) message)->mid);
1283 case GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE:
1284 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1285 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1286 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_ACK:
1287 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_NACK:
1288 msg->cid = *GCC_get_id (c);
1289 msg->ttl = htonl (default_ttl);
1293 LOG (GNUNET_ERROR_TYPE_ERROR, "type %s not valid\n", GC_m2s (type));
1295 LOG (GNUNET_ERROR_TYPE_DEBUG, "type %s\n", GC_m2s (type));
1297 fwd = GCC_is_origin (c, GNUNET_YES);
1301 GNUNET_break (NULL == GCC_send_prebuilt_message (&msg->header, type, mid, c,
1302 fwd, force, NULL, NULL));
1305 if (NULL == existing_q)
1307 tq = GNUNET_new (struct CadetTunnelQueue); /* FIXME valgrind: leak*/
1314 tq->cq = GCC_send_prebuilt_message (&msg->header, type, mid, c, fwd, force,
1315 &tun_message_sent, tq);
1316 GNUNET_assert (NULL != tq->cq);
1318 tq->cont_cls = cont_cls;
1325 * Send all cached messages that we can, tunnel is online.
1327 * @param t Tunnel that holds the messages. Cannot be loopback.
1330 send_queued_data (struct CadetTunnel *t)
1332 struct CadetTunnelDelayed *tqd;
1333 struct CadetTunnelDelayed *next;
1336 LOG (GNUNET_ERROR_TYPE_INFO, "Send queued data, tunnel %s\n", GCT_2s (t));
1338 if (GCT_is_loopback (t))
1344 if (GNUNET_NO == is_ready (t))
1346 LOG (GNUNET_ERROR_TYPE_DEBUG, " not ready yet: %s/%s\n",
1347 estate2s (t->estate), cstate2s (t->cstate));
1351 room = GCT_get_connections_buffer (t);
1352 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
1353 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq head: %p\n", t->tq_head);
1354 for (tqd = t->tq_head; NULL != tqd && room > 0; tqd = next)
1356 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending queued data\n");
1359 send_prebuilt_message ((struct GNUNET_MessageHeader *) &tqd[1],
1360 tqd->t, NULL, GNUNET_YES,
1361 NULL != tqd->tq ? tqd->tq->cont : NULL,
1362 NULL != tqd->tq ? tqd->tq->cont_cls : NULL,
1366 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_send_queued_data end\n", GCP_2s (t->peer));
1371 * Callback called when a queued message is sent.
1373 * @param cls Closure.
1374 * @param c Connection this message was on.
1375 * @param type Type of message sent.
1376 * @param fwd Was this a FWD going message?
1377 * @param size Size of the message.
1380 ephm_sent (void *cls,
1381 struct CadetConnection *c,
1382 struct CadetConnectionQueue *q,
1383 uint16_t type, int fwd, size_t size)
1385 struct CadetTunnel *t = cls;
1386 LOG (GNUNET_ERROR_TYPE_DEBUG, "ephm_sent %s\n", GC_m2s (type));
1391 * Callback called when a queued message is sent.
1393 * @param cls Closure.
1394 * @param c Connection this message was on.
1395 * @param type Type of message sent.
1396 * @param fwd Was this a FWD going message?
1397 * @param size Size of the message.
1400 pong_sent (void *cls,
1401 struct CadetConnection *c,
1402 struct CadetConnectionQueue *q,
1403 uint16_t type, int fwd, size_t size)
1405 struct CadetTunnel *t = cls;
1406 LOG (GNUNET_ERROR_TYPE_DEBUG, "pong_sent %s\n", GC_m2s (type));
1412 * Sends key exchange message on a tunnel, choosing the best connection.
1413 * Should not be called on loopback tunnels.
1415 * @param t Tunnel on which this message is transmitted.
1416 * @param message Message to send. Function modifies it.
1418 * @return Handle to the message in the connection queue.
1420 static struct CadetConnectionQueue *
1421 send_kx (struct CadetTunnel *t,
1422 const struct GNUNET_MessageHeader *message)
1424 struct CadetConnection *c;
1425 struct GNUNET_CADET_KX *msg;
1426 size_t size = ntohs (message->size);
1427 char cbuf[sizeof (struct GNUNET_CADET_KX) + size];
1432 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT KX on Tunnel %s\n", GCT_2s (t));
1434 /* Avoid loopback. */
1435 if (GCT_is_loopback (t))
1437 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback!\n");
1441 type = ntohs (message->type);
1443 /* Even if tunnel is "being destroyed", send anyway.
1444 * Could be a response to a rekey initiated by remote peer,
1445 * who is trying to create a new channel!
1448 /* Must have a connection, or be looking for one. */
1449 if (NULL == t->connection_head)
1451 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s while no connection\n", GC_m2s (type));
1452 if (CADET_TUNNEL_SEARCHING != t->cstate)
1455 GCT_debug (t, GNUNET_ERROR_TYPE_ERROR);
1456 GCP_debug (t->peer, GNUNET_ERROR_TYPE_ERROR);
1461 msg = (struct GNUNET_CADET_KX *) cbuf;
1462 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX);
1463 msg->header.size = htons (sizeof (struct GNUNET_CADET_KX) + size);
1464 c = tunnel_get_connection (t);
1467 if (NULL == t->destroy_task
1468 && CADET_TUNNEL_READY == t->cstate)
1471 GCT_debug (t, GNUNET_ERROR_TYPE_ERROR);
1477 case GNUNET_MESSAGE_TYPE_CADET_KX_EPHEMERAL:
1478 GNUNET_assert (NULL == t->ephm_h);
1480 memcpy (&msg[1], message, size);
1482 case GNUNET_MESSAGE_TYPE_CADET_KX_PONG:
1483 GNUNET_assert (NULL == t->pong_h);
1485 memcpy (&msg[1], message, size);
1489 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n", GC_m2s (type));
1493 fwd = GCC_is_origin (t->connection_head->c, GNUNET_YES);
1495 return GCC_send_prebuilt_message (&msg->header, type, 0, c,
1502 * Send the ephemeral key on a tunnel.
1504 * @param t Tunnel on which to send the key.
1507 send_ephemeral (struct CadetTunnel *t)
1509 LOG (GNUNET_ERROR_TYPE_INFO, "===> EPHM for %s\n", GCT_2s (t));
1510 if (NULL != t->ephm_h)
1512 LOG (GNUNET_ERROR_TYPE_INFO, " already queued\n");
1516 kx_msg.sender_status = htonl (t->estate);
1517 kx_msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1518 kx_msg.nonce = t->kx_ctx->challenge;
1519 LOG (GNUNET_ERROR_TYPE_DEBUG, " send nonce c %u\n", kx_msg.nonce);
1520 t_encrypt (t, &kx_msg.nonce, &kx_msg.nonce,
1521 ping_encryption_size(), kx_msg.iv, GNUNET_YES);
1522 LOG (GNUNET_ERROR_TYPE_DEBUG, " send nonce e %u\n", kx_msg.nonce);
1523 t->ephm_h = send_kx (t, &kx_msg.header);
1528 * Send a pong message on a tunnel.
1530 * @param t Tunnel on which to send the pong.
1531 * @param challenge Value sent in the ping that we have to send back.
1534 send_pong (struct CadetTunnel *t, uint32_t challenge)
1536 struct GNUNET_CADET_KX_Pong msg;
1538 LOG (GNUNET_ERROR_TYPE_INFO, "===> PONG for %s\n", GCT_2s (t));
1539 if (NULL != t->pong_h)
1541 LOG (GNUNET_ERROR_TYPE_INFO, " already queued\n");
1544 msg.header.size = htons (sizeof (msg));
1545 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX_PONG);
1546 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1547 msg.nonce = challenge;
1548 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
1549 t_encrypt (t, &msg.nonce, &msg.nonce,
1550 sizeof (msg.nonce), msg.iv, GNUNET_YES);
1551 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
1553 t->pong_h = send_kx (t, &msg.header);
1558 * Initiate a rekey with the remote peer.
1560 * @param cls Closure (tunnel).
1561 * @param tc TaskContext.
1564 rekey_tunnel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1566 struct CadetTunnel *t = cls;
1568 t->rekey_task = NULL;
1570 LOG (GNUNET_ERROR_TYPE_INFO, "Re-key Tunnel %s\n", GCT_2s (t));
1571 if (NULL != tc && 0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1574 GNUNET_assert (NULL != t->kx_ctx);
1575 struct GNUNET_TIME_Relative duration;
1577 duration = GNUNET_TIME_absolute_get_duration (t->kx_ctx->rekey_start_time);
1578 LOG (GNUNET_ERROR_TYPE_DEBUG, " kx started %s ago\n",
1579 GNUNET_STRINGS_relative_time_to_string (duration, GNUNET_YES));
1581 // FIXME make duration of old keys configurable
1582 if (duration.rel_value_us >= GNUNET_TIME_UNIT_MINUTES.rel_value_us)
1584 LOG (GNUNET_ERROR_TYPE_DEBUG, " deleting old keys\n");
1585 memset (&t->kx_ctx->d_key_old, 0, sizeof (t->kx_ctx->d_key_old));
1586 memset (&t->kx_ctx->e_key_old, 0, sizeof (t->kx_ctx->e_key_old));
1593 case CADET_TUNNEL_KEY_UNINITIALIZED:
1594 GCT_change_estate (t, CADET_TUNNEL_KEY_SENT);
1597 case CADET_TUNNEL_KEY_SENT:
1600 case CADET_TUNNEL_KEY_OK:
1602 * - state should have changed during rekey_iterator
1603 * - task should have been canceled at pong_handle
1606 GCT_change_estate (t, CADET_TUNNEL_KEY_REKEY);
1609 case CADET_TUNNEL_KEY_PING:
1610 case CADET_TUNNEL_KEY_REKEY:
1614 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unexpected state %u\n", t->estate);
1617 // FIXME exponential backoff
1618 struct GNUNET_TIME_Relative delay;
1620 delay = GNUNET_TIME_relative_divide (rekey_period, 16);
1621 delay = GNUNET_TIME_relative_min (delay, REKEY_WAIT);
1622 LOG (GNUNET_ERROR_TYPE_DEBUG, " next call in %s\n",
1623 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
1624 t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
1629 * Our ephemeral key has changed, create new session key on all tunnels.
1631 * Each tunnel will start the Key Exchange with a random delay between
1632 * 0 and number_of_tunnels*100 milliseconds, so there are 10 key exchanges
1633 * per second, on average.
1635 * @param cls Closure (size of the hashmap).
1636 * @param key Current public key.
1637 * @param value Value in the hash map (tunnel).
1639 * @return #GNUNET_YES, so we should continue to iterate,
1642 rekey_iterator (void *cls,
1643 const struct GNUNET_PeerIdentity *key,
1646 struct CadetTunnel *t = value;
1647 struct GNUNET_TIME_Relative delay;
1648 long n = (long) cls;
1651 if (NULL != t->rekey_task)
1654 if (GNUNET_YES == GCT_is_loopback (t))
1657 r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, (uint32_t) n * 100);
1658 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, r);
1659 t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
1661 GCT_change_estate (t, CADET_TUNNEL_KEY_REKEY);
1668 * Create a new ephemeral key and key message, schedule next rekeying.
1670 * @param cls Closure (unused).
1671 * @param tc TaskContext.
1674 rekey (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1676 struct GNUNET_TIME_Absolute time;
1681 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1684 GNUNET_free_non_null (my_ephemeral_key);
1685 my_ephemeral_key = GNUNET_CRYPTO_ecdhe_key_create ();
1687 time = GNUNET_TIME_absolute_get ();
1688 kx_msg.creation_time = GNUNET_TIME_absolute_hton (time);
1689 time = GNUNET_TIME_absolute_add (time, rekey_period);
1690 time = GNUNET_TIME_absolute_add (time, GNUNET_TIME_UNIT_MINUTES);
1691 kx_msg.expiration_time = GNUNET_TIME_absolute_hton (time);
1692 GNUNET_CRYPTO_ecdhe_key_get_public (my_ephemeral_key, &kx_msg.ephemeral_key);
1693 LOG (GNUNET_ERROR_TYPE_INFO, "GLOBAL RE-KEY, NEW EPHM: %s\n",
1694 GNUNET_h2s ((struct GNUNET_HashCode *) &kx_msg.ephemeral_key));
1696 GNUNET_assert (GNUNET_OK ==
1697 GNUNET_CRYPTO_eddsa_sign (my_private_key,
1699 &kx_msg.signature));
1701 n = (long) GNUNET_CONTAINER_multipeermap_size (tunnels);
1702 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &rekey_iterator, (void *) n);
1704 rekey_task = GNUNET_SCHEDULER_add_delayed (rekey_period, &rekey, NULL);
1709 * Called only on shutdown, destroy every tunnel.
1711 * @param cls Closure (unused).
1712 * @param key Current public key.
1713 * @param value Value in the hash map (tunnel).
1715 * @return #GNUNET_YES, so we should continue to iterate,
1718 destroy_iterator (void *cls,
1719 const struct GNUNET_PeerIdentity *key,
1722 struct CadetTunnel *t = value;
1724 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_shutdown destroying tunnel at %p\n", t);
1731 * Notify remote peer that we don't know a channel he is talking about,
1732 * probably CHANNEL_DESTROY was missed.
1734 * @param t Tunnel on which to notify.
1735 * @param gid ID of the channel.
1738 send_channel_destroy (struct CadetTunnel *t, unsigned int gid)
1740 struct GNUNET_CADET_ChannelManage msg;
1742 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY);
1743 msg.header.size = htons (sizeof (msg));
1744 msg.chid = htonl (gid);
1746 LOG (GNUNET_ERROR_TYPE_DEBUG,
1747 "WARNING destroying unknown channel %u on tunnel %s\n",
1749 send_prebuilt_message (&msg.header, t, NULL, GNUNET_YES, NULL, NULL, NULL);
1754 * Demultiplex data per channel and call appropriate channel handler.
1756 * @param t Tunnel on which the data came.
1757 * @param msg Data message.
1758 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1759 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1760 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1761 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1764 handle_data (struct CadetTunnel *t,
1765 const struct GNUNET_CADET_Data *msg,
1768 struct CadetChannel *ch;
1772 size = ntohs (msg->header.size);
1774 sizeof (struct GNUNET_CADET_Data) +
1775 sizeof (struct GNUNET_MessageHeader))
1780 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
1781 GC_m2s (ntohs (msg[1].header.type)));
1784 ch = GCT_get_channel (t, ntohl (msg->chid));
1787 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
1789 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel 0x%X unknown\n",
1791 send_channel_destroy (t, ntohl (msg->chid));
1795 GCCH_handle_data (ch, msg, fwd);
1800 * Demultiplex data ACKs per channel and update appropriate channel buffer info.
1802 * @param t Tunnel on which the DATA ACK came.
1803 * @param msg DATA ACK message.
1804 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1805 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1806 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1807 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1810 handle_data_ack (struct CadetTunnel *t,
1811 const struct GNUNET_CADET_DataACK *msg,
1814 struct CadetChannel *ch;
1818 size = ntohs (msg->header.size);
1819 if (size != sizeof (struct GNUNET_CADET_DataACK))
1826 ch = GCT_get_channel (t, ntohl (msg->chid));
1829 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
1831 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1836 GCCH_handle_data_ack (ch, msg, fwd);
1841 * Handle channel create.
1843 * @param t Tunnel on which the data came.
1844 * @param msg Data message.
1847 handle_ch_create (struct CadetTunnel *t,
1848 const struct GNUNET_CADET_ChannelCreate *msg)
1850 struct CadetChannel *ch;
1854 size = ntohs (msg->header.size);
1855 if (size != sizeof (struct GNUNET_CADET_ChannelCreate))
1862 ch = GCT_get_channel (t, ntohl (msg->chid));
1863 if (NULL != ch && ! GCT_is_loopback (t))
1865 /* Probably a retransmission, safe to ignore */
1866 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
1868 ch = GCCH_handle_create (t, msg);
1870 GCT_add_channel (t, ch);
1876 * Handle channel NACK: check correctness and call channel handler for NACKs.
1878 * @param t Tunnel on which the NACK came.
1879 * @param msg NACK message.
1882 handle_ch_nack (struct CadetTunnel *t,
1883 const struct GNUNET_CADET_ChannelManage *msg)
1885 struct CadetChannel *ch;
1889 size = ntohs (msg->header.size);
1890 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
1897 ch = GCT_get_channel (t, ntohl (msg->chid));
1900 GNUNET_STATISTICS_update (stats, "# channel NACK on unknown channel",
1902 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1907 GCCH_handle_nack (ch);
1912 * Handle a CHANNEL ACK (SYNACK/ACK).
1914 * @param t Tunnel on which the CHANNEL ACK came.
1915 * @param msg CHANNEL ACK message.
1916 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1917 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1918 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1919 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1922 handle_ch_ack (struct CadetTunnel *t,
1923 const struct GNUNET_CADET_ChannelManage *msg,
1926 struct CadetChannel *ch;
1930 size = ntohs (msg->header.size);
1931 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
1938 ch = GCT_get_channel (t, ntohl (msg->chid));
1941 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
1943 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1948 GCCH_handle_ack (ch, msg, fwd);
1953 * Handle a channel destruction message.
1955 * @param t Tunnel on which the message came.
1956 * @param msg Channel destroy message.
1957 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1958 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1959 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1960 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1963 handle_ch_destroy (struct CadetTunnel *t,
1964 const struct GNUNET_CADET_ChannelManage *msg,
1967 struct CadetChannel *ch;
1971 size = ntohs (msg->header.size);
1972 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
1979 ch = GCT_get_channel (t, ntohl (msg->chid));
1982 /* Probably a retransmission, safe to ignore */
1986 GCCH_handle_destroy (ch, msg, fwd);
1991 * The peer's ephemeral key has changed: update the symmetrical keys.
1993 * @param t Tunnel this message came on.
1994 * @param msg Key eXchange message.
1997 handle_ephemeral (struct CadetTunnel *t,
1998 const struct GNUNET_CADET_KX_Ephemeral *msg)
2000 LOG (GNUNET_ERROR_TYPE_INFO, "<=== EPHM for %s\n", GCT_2s (t));
2002 if (GNUNET_OK != check_ephemeral (t, msg))
2004 GNUNET_break_op (0);
2009 * If the key is different from what we know, derive the new E/D keys.
2010 * Else destroy the rekey ctx (duplicate EPHM after successful KX).
2012 if (0 != memcmp (&t->peers_ephemeral_key, &msg->ephemeral_key,
2013 sizeof (msg->ephemeral_key)))
2015 #if DUMP_KEYS_TO_STDERR
2016 LOG (GNUNET_ERROR_TYPE_INFO, "OLD: %s\n",
2017 GNUNET_h2s ((struct GNUNET_HashCode *) &t->peers_ephemeral_key));
2018 LOG (GNUNET_ERROR_TYPE_INFO, "NEW: %s\n",
2019 GNUNET_h2s ((struct GNUNET_HashCode *) &msg->ephemeral_key));
2021 t->peers_ephemeral_key = msg->ephemeral_key;
2025 if (CADET_TUNNEL_KEY_OK == t->estate)
2027 GCT_change_estate (t, CADET_TUNNEL_KEY_REKEY);
2029 if (NULL != t->rekey_task)
2030 GNUNET_SCHEDULER_cancel (t->rekey_task);
2031 t->rekey_task = GNUNET_SCHEDULER_add_now (rekey_tunnel, t);
2033 if (CADET_TUNNEL_KEY_SENT == t->estate)
2035 LOG (GNUNET_ERROR_TYPE_DEBUG, " our key was sent, sending challenge\n");
2037 GCT_change_estate (t, CADET_TUNNEL_KEY_PING);
2040 if (CADET_TUNNEL_KEY_UNINITIALIZED != ntohl(msg->sender_status))
2044 LOG (GNUNET_ERROR_TYPE_DEBUG, " recv nonce e %u\n", msg->nonce);
2045 t_decrypt (t, &nonce, &msg->nonce, ping_encryption_size (), msg->iv);
2046 LOG (GNUNET_ERROR_TYPE_DEBUG, " recv nonce c %u\n", nonce);
2047 send_pong (t, nonce);
2053 * Peer has answer to our challenge.
2054 * If answer is successful, consider the key exchange finished and clean
2055 * up all related state.
2057 * @param t Tunnel this message came on.
2058 * @param msg Key eXchange Pong message.
2061 handle_pong (struct CadetTunnel *t,
2062 const struct GNUNET_CADET_KX_Pong *msg)
2066 LOG (GNUNET_ERROR_TYPE_INFO, "<=== PONG for %s\n", GCT_2s (t));
2067 if (NULL == t->rekey_task)
2069 GNUNET_STATISTICS_update (stats, "# duplicate PONG messages", 1, GNUNET_NO);
2072 if (NULL == t->kx_ctx)
2074 GNUNET_STATISTICS_update (stats, "# stray PONG messages", 1, GNUNET_NO);
2078 t_decrypt (t, &challenge, &msg->nonce, sizeof (uint32_t), msg->iv);
2079 if (challenge != t->kx_ctx->challenge)
2081 LOG (GNUNET_ERROR_TYPE_WARNING, "Wrong PONG challenge on %s\n", GCT_2s (t));
2082 LOG (GNUNET_ERROR_TYPE_DEBUG, "PONG: %u (e: %u). Expected: %u.\n",
2083 challenge, msg->nonce, t->kx_ctx->challenge);
2087 GNUNET_SCHEDULER_cancel (t->rekey_task);
2088 t->rekey_task = NULL;
2090 /* Don't free the old keys right away, but after a delay.
2091 * Rationale: the KX could have happened over a very fast connection,
2092 * with payload traffic still signed with the old key stuck in a slower
2094 * Don't keep the keys longer than 1/4 the rekey period, and no longer than
2098 GCT_change_estate (t, CADET_TUNNEL_KEY_OK);
2103 * Demultiplex by message type and call appropriate handler for a message
2104 * towards a channel of a local tunnel.
2106 * @param t Tunnel this message came on.
2107 * @param msgh Message header.
2108 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2109 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2110 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2111 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2114 handle_decrypted (struct CadetTunnel *t,
2115 const struct GNUNET_MessageHeader *msgh,
2120 type = ntohs (msgh->type);
2121 LOG (GNUNET_ERROR_TYPE_INFO, "<=== %s on %s\n", GC_m2s (type), GCT_2s (t));
2125 case GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE:
2126 /* Do nothing, connection aleady got updated. */
2127 GNUNET_STATISTICS_update (stats, "# keepalives received", 1, GNUNET_NO);
2130 case GNUNET_MESSAGE_TYPE_CADET_DATA:
2131 /* Don't send hop ACK, wait for client to ACK */
2132 handle_data (t, (struct GNUNET_CADET_Data *) msgh, fwd);
2135 case GNUNET_MESSAGE_TYPE_CADET_DATA_ACK:
2136 handle_data_ack (t, (struct GNUNET_CADET_DataACK *) msgh, fwd);
2139 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
2140 handle_ch_create (t,
2141 (struct GNUNET_CADET_ChannelCreate *) msgh);
2144 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_NACK:
2146 (struct GNUNET_CADET_ChannelManage *) msgh);
2149 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_ACK:
2151 (struct GNUNET_CADET_ChannelManage *) msgh,
2155 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
2156 handle_ch_destroy (t,
2157 (struct GNUNET_CADET_ChannelManage *) msgh,
2162 GNUNET_break_op (0);
2163 LOG (GNUNET_ERROR_TYPE_WARNING,
2164 "end-to-end message not known (%u)\n",
2165 ntohs (msgh->type));
2166 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
2170 /******************************************************************************/
2171 /******************************** API ***********************************/
2172 /******************************************************************************/
2174 * Decrypt old format and demultiplex by message type. Call appropriate handler
2175 * for a message towards a channel of a local tunnel.
2177 * @param t Tunnel this message came on.
2178 * @param msg Message header.
2181 GCT_handle_encrypted (struct CadetTunnel *t,
2182 const struct GNUNET_MessageHeader *msg)
2184 size_t size = ntohs (msg->size);
2185 size_t payload_size;
2188 uint16_t type = ntohs (msg->type);
2189 struct GNUNET_MessageHeader *msgh;
2192 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == type)
2194 const struct GNUNET_CADET_Encrypted *emsg;
2196 emsg = (struct GNUNET_CADET_Encrypted *) msg;
2197 payload_size = size - sizeof (struct GNUNET_CADET_Encrypted);
2198 decrypted_size = t_decrypt_and_validate (t, cbuf, &emsg[1], payload_size,
2199 emsg->iv, &emsg->hmac);
2201 else if (GNUNET_MESSAGE_TYPE_CADET_AX == type)
2203 const struct GNUNET_CADET_AX *emsg;
2205 emsg = (struct GNUNET_CADET_AX *) msg;
2206 payload_size = size - sizeof (struct GNUNET_CADET_AX);
2207 decrypted_size = t_ax_decrypt_and_validate (t, cbuf, &emsg[1],
2208 payload_size, &emsg->hmac);
2211 if (-1 == decrypted_size)
2213 GNUNET_break_op (0);
2218 while (off < decrypted_size)
2222 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
2223 msize = ntohs (msgh->size);
2224 if (msize < sizeof (struct GNUNET_MessageHeader))
2226 GNUNET_break_op (0);
2229 handle_decrypted (t, msgh, GNUNET_SYSERR);
2236 * Demultiplex an encapsulated KX message by message type.
2238 * @param t Tunnel on which the message came.
2239 * @param message Payload of KX message.
2242 GCT_handle_kx (struct CadetTunnel *t,
2243 const struct GNUNET_MessageHeader *message)
2247 type = ntohs (message->type);
2248 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message received\n", type);
2251 case GNUNET_MESSAGE_TYPE_CADET_KX_EPHEMERAL:
2252 handle_ephemeral (t, (struct GNUNET_CADET_KX_Ephemeral *) message);
2255 case GNUNET_MESSAGE_TYPE_CADET_KX_PONG:
2256 handle_pong (t, (struct GNUNET_CADET_KX_Pong *) message);
2260 GNUNET_break_op (0);
2261 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message not known (%u)\n", type);
2267 * Initialize the tunnel subsystem.
2269 * @param c Configuration handle.
2270 * @param key ECC private key, to derive all other keys and do crypto.
2273 GCT_init (const struct GNUNET_CONFIGURATION_Handle *c,
2274 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
2276 int expected_overhead;
2278 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
2280 expected_overhead = 0;
2281 expected_overhead += sizeof (struct GNUNET_CADET_Encrypted);
2282 expected_overhead += sizeof (struct GNUNET_CADET_Data);
2283 expected_overhead += sizeof (struct GNUNET_CADET_ACK);
2284 GNUNET_assert (GNUNET_CONSTANTS_CADET_P2P_OVERHEAD == expected_overhead);
2287 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DEFAULT_TTL",
2290 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
2291 "CADET", "DEFAULT_TTL", "USING DEFAULT");
2295 GNUNET_CONFIGURATION_get_value_time (c, "CADET", "REKEY_PERIOD",
2298 rekey_period = GNUNET_TIME_UNIT_DAYS;
2301 my_private_key = key;
2302 kx_msg.header.size = htons (sizeof (kx_msg));
2303 kx_msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX_EPHEMERAL);
2304 kx_msg.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CADET_KX);
2305 kx_msg.purpose.size = htonl (ephemeral_purpose_size ());
2306 kx_msg.origin_identity = my_full_id;
2307 rekey_task = GNUNET_SCHEDULER_add_now (&rekey, NULL);
2309 tunnels = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
2314 * Shut down the tunnel subsystem.
2319 if (NULL != rekey_task)
2321 GNUNET_SCHEDULER_cancel (rekey_task);
2324 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &destroy_iterator, NULL);
2325 GNUNET_CONTAINER_multipeermap_destroy (tunnels);
2332 * @param destination Peer this tunnel is towards.
2334 struct CadetTunnel *
2335 GCT_new (struct CadetPeer *destination)
2337 struct CadetTunnel *t;
2339 t = GNUNET_new (struct CadetTunnel);
2341 t->peer = destination;
2344 GNUNET_CONTAINER_multipeermap_put (tunnels, GCP_get_id (destination), t,
2345 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2356 * Change the tunnel's connection state.
2358 * @param t Tunnel whose connection state to change.
2359 * @param cstate New connection state.
2362 GCT_change_cstate (struct CadetTunnel* t, enum CadetTunnelCState cstate)
2366 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s cstate %s => %s\n",
2367 GCP_2s (t->peer), cstate2s (t->cstate), cstate2s (cstate));
2368 if (myid != GCP_get_short_id (t->peer) &&
2369 CADET_TUNNEL_READY != t->cstate &&
2370 CADET_TUNNEL_READY == cstate)
2373 if (CADET_TUNNEL_KEY_OK == t->estate)
2375 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered send queued data\n");
2376 send_queued_data (t);
2378 else if (CADET_TUNNEL_KEY_UNINITIALIZED == t->estate)
2380 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered rekey\n");
2381 if (NULL != t->rekey_task)
2382 GNUNET_SCHEDULER_cancel (t->rekey_task);
2384 rekey_tunnel (t, NULL);
2389 if (CADET_TUNNEL_READY == cstate
2390 && CONNECTIONS_PER_TUNNEL <= GCT_count_connections (t))
2392 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered stop dht\n");
2393 GCP_stop_search (t->peer);
2399 * Change the tunnel encryption state.
2401 * @param t Tunnel whose encryption state to change, or NULL.
2402 * @param state New encryption state.
2405 GCT_change_estate (struct CadetTunnel* t, enum CadetTunnelEState state)
2407 enum CadetTunnelEState old;
2414 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s estate was %s\n",
2415 GCP_2s (t->peer), estate2s (old));
2416 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s estate is now %s\n",
2417 GCP_2s (t->peer), estate2s (t->estate));
2419 /* Send queued data if enc state changes to OK */
2420 if (myid != GCP_get_short_id (t->peer) &&
2421 CADET_TUNNEL_KEY_OK != old && CADET_TUNNEL_KEY_OK == t->estate)
2423 send_queued_data (t);
2429 * @brief Check if tunnel has too many connections, and remove one if necessary.
2431 * Currently this means the newest connection, unless it is a direct one.
2432 * Implemented as a task to avoid freeing a connection that is in the middle
2433 * of being created/processed.
2435 * @param cls Closure (Tunnel to check).
2436 * @param tc Task context.
2439 trim_connections (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2441 struct CadetTunnel *t = cls;
2443 t->trim_connections_task = NULL;
2445 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2448 if (GCT_count_connections (t) > 2 * CONNECTIONS_PER_TUNNEL)
2450 struct CadetTConnection *iter;
2451 struct CadetTConnection *c;
2453 for (c = iter = t->connection_head; NULL != iter; iter = iter->next)
2455 if ((iter->created.abs_value_us > c->created.abs_value_us)
2456 && GNUNET_NO == GCC_is_direct (iter->c))
2463 LOG (GNUNET_ERROR_TYPE_DEBUG, "Too many connections on tunnel %s\n",
2465 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying connection %s\n",
2478 * Add a connection to a tunnel.
2481 * @param c Connection.
2484 GCT_add_connection (struct CadetTunnel *t, struct CadetConnection *c)
2486 struct CadetTConnection *aux;
2488 GNUNET_assert (NULL != c);
2490 LOG (GNUNET_ERROR_TYPE_DEBUG, "add connection %s\n", GCC_2s (c));
2491 LOG (GNUNET_ERROR_TYPE_DEBUG, " to tunnel %s\n", GCT_2s (t));
2492 for (aux = t->connection_head; aux != NULL; aux = aux->next)
2496 aux = GNUNET_new (struct CadetTConnection);
2498 aux->created = GNUNET_TIME_absolute_get ();
2500 GNUNET_CONTAINER_DLL_insert (t->connection_head, t->connection_tail, aux);
2502 if (CADET_TUNNEL_SEARCHING == t->cstate)
2503 GCT_change_estate (t, CADET_TUNNEL_WAITING);
2505 if (NULL != t->trim_connections_task)
2506 t->trim_connections_task = GNUNET_SCHEDULER_add_now (&trim_connections, t);
2511 * Remove a connection from a tunnel.
2514 * @param c Connection.
2517 GCT_remove_connection (struct CadetTunnel *t,
2518 struct CadetConnection *c)
2520 struct CadetTConnection *aux;
2521 struct CadetTConnection *next;
2524 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing connection %s from tunnel %s\n",
2525 GCC_2s (c), GCT_2s (t));
2526 for (aux = t->connection_head; aux != NULL; aux = next)
2531 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
2536 conns = GCT_count_connections (t);
2538 && NULL == t->destroy_task
2539 && CADET_TUNNEL_SHUTDOWN != t->cstate
2540 && GNUNET_NO == shutting_down)
2542 if (0 == GCT_count_any_connections (t))
2543 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2545 GCT_change_cstate (t, CADET_TUNNEL_WAITING);
2548 /* Start new connections if needed */
2549 if (CONNECTIONS_PER_TUNNEL > conns
2550 && NULL == t->destroy_task
2551 && CADET_TUNNEL_SHUTDOWN != t->cstate
2552 && GNUNET_NO == shutting_down)
2554 LOG (GNUNET_ERROR_TYPE_DEBUG, " too few connections, getting new ones\n");
2555 GCP_connect (t->peer); /* Will change cstate to WAITING when possible */
2559 /* If not marked as ready, no change is needed */
2560 if (CADET_TUNNEL_READY != t->cstate)
2563 /* Check if any connection is ready to maintain cstate */
2564 for (aux = t->connection_head; aux != NULL; aux = aux->next)
2565 if (CADET_CONNECTION_READY == GCC_get_state (aux->c))
2571 * Add a channel to a tunnel.
2574 * @param ch Channel.
2577 GCT_add_channel (struct CadetTunnel *t, struct CadetChannel *ch)
2579 struct CadetTChannel *aux;
2581 GNUNET_assert (NULL != ch);
2583 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
2585 for (aux = t->channel_head; aux != NULL; aux = aux->next)
2587 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
2592 aux = GNUNET_new (struct CadetTChannel);
2594 LOG (GNUNET_ERROR_TYPE_DEBUG, " adding %p to %p\n", aux, t->channel_head);
2595 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
2597 if (NULL != t->destroy_task)
2599 GNUNET_SCHEDULER_cancel (t->destroy_task);
2600 t->destroy_task = NULL;
2601 LOG (GNUNET_ERROR_TYPE_DEBUG, " undo destroy!\n");
2607 * Remove a channel from a tunnel.
2610 * @param ch Channel.
2613 GCT_remove_channel (struct CadetTunnel *t, struct CadetChannel *ch)
2615 struct CadetTChannel *aux;
2617 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
2618 for (aux = t->channel_head; aux != NULL; aux = aux->next)
2622 LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GCCH_2s (ch));
2623 GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
2632 * Search for a channel by global ID.
2634 * @param t Tunnel containing the channel.
2635 * @param chid Public channel number.
2637 * @return channel handler, NULL if doesn't exist
2639 struct CadetChannel *
2640 GCT_get_channel (struct CadetTunnel *t, CADET_ChannelNumber chid)
2642 struct CadetTChannel *iter;
2647 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2649 if (GCCH_get_id (iter->ch) == chid)
2653 return NULL == iter ? NULL : iter->ch;
2658 * @brief Destroy a tunnel and free all resources.
2660 * Should only be called a while after the tunnel has been marked as destroyed,
2661 * in case there is a new channel added to the same peer shortly after marking
2662 * the tunnel. This way we avoid a new public key handshake.
2664 * @param cls Closure (tunnel to destroy).
2665 * @param tc Task context.
2668 delayed_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2670 struct CadetTunnel *t = cls;
2671 struct CadetTConnection *iter;
2673 LOG (GNUNET_ERROR_TYPE_DEBUG, "delayed destroying tunnel %p\n", t);
2674 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
2676 LOG (GNUNET_ERROR_TYPE_WARNING,
2677 "Not destroying tunnel, due to shutdown. "
2678 "Tunnel at %p should have been freed by GCT_shutdown\n", t);
2681 t->destroy_task = NULL;
2682 t->cstate = CADET_TUNNEL_SHUTDOWN;
2684 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2686 GCC_send_destroy (iter->c);
2693 * Tunnel is empty: destroy it.
2695 * Notifies all connections about the destruction.
2697 * @param t Tunnel to destroy.
2700 GCT_destroy_empty (struct CadetTunnel *t)
2702 if (GNUNET_YES == shutting_down)
2703 return; /* Will be destroyed immediately anyway */
2705 if (NULL != t->destroy_task)
2707 LOG (GNUNET_ERROR_TYPE_WARNING,
2708 "Tunnel %s is already scheduled for destruction. Tunnel debug dump:\n",
2710 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
2712 /* should never happen, tunnel can only become empty once, and the
2713 * task identifier should be NO_TASK (cleaned when the tunnel was created
2714 * or became un-empty)
2719 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s empty: scheduling destruction\n",
2722 // FIXME make delay a config option
2723 t->destroy_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
2724 &delayed_destroy, t);
2725 LOG (GNUNET_ERROR_TYPE_DEBUG, "Scheduled destroy of %p as %llu\n",
2726 t, t->destroy_task);
2731 * Destroy tunnel if empty (no more channels).
2733 * @param t Tunnel to destroy if empty.
2736 GCT_destroy_if_empty (struct CadetTunnel *t)
2738 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s destroy if empty\n", GCT_2s (t));
2739 if (0 < GCT_count_channels (t))
2742 GCT_destroy_empty (t);
2747 * Destroy the tunnel.
2749 * This function does not generate any warning traffic to clients or peers.
2752 * Cancel messages belonging to this tunnel queued to neighbors.
2753 * Free any allocated resources linked to the tunnel.
2755 * @param t The tunnel to destroy.
2758 GCT_destroy (struct CadetTunnel *t)
2760 struct CadetTConnection *iter_c;
2761 struct CadetTConnection *next_c;
2762 struct CadetTChannel *iter_ch;
2763 struct CadetTChannel *next_ch;
2768 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GCP_2s (t->peer));
2770 GNUNET_break (GNUNET_YES ==
2771 GNUNET_CONTAINER_multipeermap_remove (tunnels,
2772 GCP_get_id (t->peer), t));
2774 for (iter_c = t->connection_head; NULL != iter_c; iter_c = next_c)
2776 next_c = iter_c->next;
2777 GCC_destroy (iter_c->c);
2779 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = next_ch)
2781 next_ch = iter_ch->next;
2782 GCCH_destroy (iter_ch->ch);
2783 /* Should only happen on shutdown, but it's ok. */
2786 if (NULL != t->destroy_task)
2788 LOG (GNUNET_ERROR_TYPE_DEBUG, "cancelling dest: %llX\n", t->destroy_task);
2789 GNUNET_SCHEDULER_cancel (t->destroy_task);
2790 t->destroy_task = NULL;
2793 if (NULL != t->trim_connections_task)
2795 LOG (GNUNET_ERROR_TYPE_DEBUG, "cancelling trim: %llX\n",
2796 t->trim_connections_task);
2797 GNUNET_SCHEDULER_cancel (t->trim_connections_task);
2798 t->trim_connections_task = NULL;
2801 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2802 GCP_set_tunnel (t->peer, NULL);
2804 if (NULL != t->rekey_task)
2806 GNUNET_SCHEDULER_cancel (t->rekey_task);
2807 t->rekey_task = NULL;
2809 if (NULL != t->kx_ctx)
2811 if (NULL != t->kx_ctx->finish_task)
2812 GNUNET_SCHEDULER_cancel (t->kx_ctx->finish_task);
2813 GNUNET_free (t->kx_ctx);
2820 * @brief Use the given path for the tunnel.
2821 * Update the next and prev hops (and RCs).
2822 * (Re)start the path refresh in case the tunnel is locally owned.
2824 * @param t Tunnel to update.
2825 * @param p Path to use.
2827 * @return Connection created.
2829 struct CadetConnection *
2830 GCT_use_path (struct CadetTunnel *t, struct CadetPeerPath *p)
2832 struct CadetConnection *c;
2833 struct GNUNET_CADET_Hash cid;
2834 unsigned int own_pos;
2836 if (NULL == t || NULL == p)
2842 if (CADET_TUNNEL_SHUTDOWN == t->cstate)
2848 for (own_pos = 0; own_pos < p->length; own_pos++)
2850 if (p->peers[own_pos] == myid)
2853 if (own_pos >= p->length)
2855 GNUNET_break_op (0);
2859 GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE, &cid, sizeof (cid));
2860 c = GCC_new (&cid, t, p, own_pos);
2863 /* Path was flawed */
2866 GCT_add_connection (t, c);
2872 * Count all created connections of a tunnel. Not necessarily ready connections!
2874 * @param t Tunnel on which to count.
2876 * @return Number of connections created, either being established or ready.
2879 GCT_count_any_connections (struct CadetTunnel *t)
2881 struct CadetTConnection *iter;
2887 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2895 * Count established (ready) connections of a tunnel.
2897 * @param t Tunnel on which to count.
2899 * @return Number of connections.
2902 GCT_count_connections (struct CadetTunnel *t)
2904 struct CadetTConnection *iter;
2910 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2911 if (CADET_CONNECTION_READY == GCC_get_state (iter->c))
2919 * Count channels of a tunnel.
2921 * @param t Tunnel on which to count.
2923 * @return Number of channels.
2926 GCT_count_channels (struct CadetTunnel *t)
2928 struct CadetTChannel *iter;
2931 for (count = 0, iter = t->channel_head;
2933 iter = iter->next, count++) /* skip */;
2940 * Get the connectivity state of a tunnel.
2944 * @return Tunnel's connectivity state.
2946 enum CadetTunnelCState
2947 GCT_get_cstate (struct CadetTunnel *t)
2952 return (enum CadetTunnelCState) -1;
2959 * Get the encryption state of a tunnel.
2963 * @return Tunnel's encryption state.
2965 enum CadetTunnelEState
2966 GCT_get_estate (struct CadetTunnel *t)
2971 return (enum CadetTunnelEState) -1;
2977 * Get the maximum buffer space for a tunnel towards a local client.
2981 * @return Biggest buffer space offered by any channel in the tunnel.
2984 GCT_get_channels_buffer (struct CadetTunnel *t)
2986 struct CadetTChannel *iter;
2987 unsigned int buffer;
2988 unsigned int ch_buf;
2990 if (NULL == t->channel_head)
2992 /* Probably getting buffer for a channel create/handshake. */
2993 LOG (GNUNET_ERROR_TYPE_DEBUG, " no channels, allow max\n");
2998 for (iter = t->channel_head; NULL != iter; iter = iter->next)
3000 ch_buf = get_channel_buffer (iter);
3001 if (ch_buf > buffer)
3009 * Get the total buffer space for a tunnel for P2P traffic.
3013 * @return Buffer space offered by all connections in the tunnel.
3016 GCT_get_connections_buffer (struct CadetTunnel *t)
3018 struct CadetTConnection *iter;
3019 unsigned int buffer;
3021 if (GNUNET_NO == is_ready (t))
3023 if (count_queued_data (t) > 3)
3030 for (iter = t->connection_head; NULL != iter; iter = iter->next)
3032 if (GCC_get_state (iter->c) != CADET_CONNECTION_READY)
3036 buffer += get_connection_buffer (iter);
3044 * Get the tunnel's destination.
3048 * @return ID of the destination peer.
3050 const struct GNUNET_PeerIdentity *
3051 GCT_get_destination (struct CadetTunnel *t)
3053 return GCP_get_id (t->peer);
3058 * Get the tunnel's next free global channel ID.
3062 * @return GID of a channel free to use.
3065 GCT_get_next_chid (struct CadetTunnel *t)
3067 CADET_ChannelNumber chid;
3068 CADET_ChannelNumber mask;
3071 /* Set bit 30 depending on the ID relationship. Bit 31 is always 0 for GID.
3072 * If our ID is bigger or loopback tunnel, start at 0, bit 30 = 0
3073 * If peer's ID is bigger, start at 0x4... bit 30 = 1
3075 result = GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, GCP_get_id (t->peer));
3080 t->next_chid |= mask;
3082 while (NULL != GCT_get_channel (t, t->next_chid))
3084 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
3085 t->next_chid = (t->next_chid + 1) & ~GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
3086 t->next_chid |= mask;
3088 chid = t->next_chid;
3089 t->next_chid = (t->next_chid + 1) & ~GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
3090 t->next_chid |= mask;
3097 * Send ACK on one or more channels due to buffer in connections.
3099 * @param t Channel which has some free buffer space.
3102 GCT_unchoke_channels (struct CadetTunnel *t)
3104 struct CadetTChannel *iter;
3105 unsigned int buffer;
3106 unsigned int channels = GCT_count_channels (t);
3107 unsigned int choked_n;
3108 struct CadetChannel *choked[channels];
3110 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_unchoke_channels on %s\n", GCT_2s (t));
3111 LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
3112 if (NULL != t->channel_head)
3113 LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
3115 /* Get buffer space */
3116 buffer = GCT_get_connections_buffer (t);
3122 /* Count and remember choked channels */
3124 for (iter = t->channel_head; NULL != iter; iter = iter->next)
3126 if (GNUNET_NO == get_channel_allowed (iter))
3128 choked[choked_n++] = iter->ch;
3132 /* Unchoke random channels */
3133 while (0 < buffer && 0 < choked_n)
3135 unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3137 GCCH_allow_client (choked[r], GCCH_is_origin (choked[r], GNUNET_YES));
3140 choked[r] = choked[choked_n];
3146 * Send ACK on one or more connections due to buffer space to the client.
3148 * Iterates all connections of the tunnel and sends ACKs appropriately.
3153 GCT_send_connection_acks (struct CadetTunnel *t)
3155 struct CadetTConnection *iter;
3158 uint32_t allow_per_connection;
3160 unsigned int buffer;
3162 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel send connection ACKs on %s\n",
3171 if (CADET_TUNNEL_READY != t->cstate)
3174 buffer = GCT_get_channels_buffer (t);
3175 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer %u\n", buffer);
3177 /* Count connections, how many messages are already allowed */
3178 cs = GCT_count_connections (t);
3179 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
3181 allowed += get_connection_allowed (iter);
3183 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowed %u\n", allowed);
3185 /* Make sure there is no overflow */
3186 if (allowed > buffer)
3189 /* Authorize connections to send more data */
3190 to_allow = buffer - allowed;
3192 for (iter = t->connection_head;
3193 NULL != iter && to_allow > 0;
3196 if (CADET_CONNECTION_READY != GCC_get_state (iter->c)
3197 || get_connection_allowed (iter) > 64 / 3)
3201 allow_per_connection = to_allow/cs;
3202 to_allow -= allow_per_connection;
3204 GCC_allow (iter->c, allow_per_connection,
3205 GCC_is_origin (iter->c, GNUNET_NO));
3210 /* Since we don't allow if it's allowed to send 64/3, this can happen. */
3211 LOG (GNUNET_ERROR_TYPE_DEBUG, " reminding to_allow: %u\n", to_allow);
3217 * Cancel a previously sent message while it's in the queue.
3219 * ONLY can be called before the continuation given to the send function
3220 * is called. Once the continuation is called, the message is no longer in the
3223 * @param q Handle to the queue.
3226 GCT_cancel (struct CadetTunnelQueue *q)
3231 /* tun_message_sent() will be called and free q */
3233 else if (NULL != q->tqd)
3235 unqueue_data (q->tqd);
3237 if (NULL != q->cont)
3238 q->cont (q->cont_cls, NULL, q, 0, 0);
3249 * Sends an already built message on a tunnel, encrypting it and
3250 * choosing the best connection if not provided.
3252 * @param message Message to send. Function modifies it.
3253 * @param t Tunnel on which this message is transmitted.
3254 * @param c Connection to use (autoselect if NULL).
3255 * @param force Force the tunnel to take the message (buffer overfill).
3256 * @param cont Continuation to call once message is really sent.
3257 * @param cont_cls Closure for @c cont.
3259 * @return Handle to cancel message. NULL if @c cont is NULL.
3261 struct CadetTunnelQueue *
3262 GCT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
3263 struct CadetTunnel *t, struct CadetConnection *c,
3264 int force, GCT_sent cont, void *cont_cls)
3266 return send_prebuilt_message (message, t, c, force, cont, cont_cls, NULL);
3270 * Sends an already built and encrypted message on a tunnel, choosing the best
3271 * connection. Useful for re-queueing messages queued on a destroyed connection.
3273 * @param message Message to send. Function modifies it.
3274 * @param t Tunnel on which this message is transmitted.
3277 GCT_resend_message (const struct GNUNET_MessageHeader *message,
3278 struct CadetTunnel *t)
3280 struct CadetConnection *c;
3283 c = tunnel_get_connection (t);
3286 /* TODO queue in tunnel, marked as encrypted */
3287 LOG (GNUNET_ERROR_TYPE_DEBUG, "No connection available, dropping.\n");
3290 fwd = GCC_is_origin (c, GNUNET_YES);
3291 GNUNET_break (NULL == GCC_send_prebuilt_message (message, 0, 0, c, fwd,
3292 GNUNET_YES, NULL, NULL));
3297 * Is the tunnel directed towards the local peer?
3301 * @return #GNUNET_YES if it is loopback.
3304 GCT_is_loopback (const struct CadetTunnel *t)
3306 return (myid == GCP_get_short_id (t->peer));
3311 * Is the tunnel this path already?
3316 * @return #GNUNET_YES a connection uses this path.
3319 GCT_is_path_used (const struct CadetTunnel *t, const struct CadetPeerPath *p)
3321 struct CadetTConnection *iter;
3323 for (iter = t->connection_head; NULL != iter; iter = iter->next)
3324 if (path_equivalent (GCC_get_path (iter->c), p))
3332 * Get a cost of a path for a tunnel considering existing connections.
3335 * @param path Candidate path.
3337 * @return Cost of the path (path length + number of overlapping nodes)
3340 GCT_get_path_cost (const struct CadetTunnel *t,
3341 const struct CadetPeerPath *path)
3343 struct CadetTConnection *iter;
3344 const struct CadetPeerPath *aux;
3345 unsigned int overlap;
3353 GNUNET_assert (NULL != t);
3355 for (i = 0; i < path->length; i++)
3357 for (iter = t->connection_head; NULL != iter; iter = iter->next)
3359 aux = GCC_get_path (iter->c);
3363 for (j = 0; j < aux->length; j++)
3365 if (path->peers[i] == aux->peers[j])
3373 return path->length + overlap;
3378 * Get the static string for the peer this tunnel is directed.
3382 * @return Static string the destination peer's ID.
3385 GCT_2s (const struct CadetTunnel *t)
3390 return GCP_2s (t->peer);
3394 /******************************************************************************/
3395 /***************************** INFO/DEBUG *******************************/
3396 /******************************************************************************/
3399 * Log all possible info about the tunnel state.
3401 * @param t Tunnel to debug.
3402 * @param level Debug level to use.
3405 GCT_debug (const struct CadetTunnel *t, enum GNUNET_ErrorType level)
3407 struct CadetTChannel *iterch;
3408 struct CadetTConnection *iterc;
3411 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
3413 __FILE__, __FUNCTION__, __LINE__);
3417 LOG2 (level, "TTT DEBUG TUNNEL TOWARDS %s\n", GCT_2s (t));
3418 LOG2 (level, "TTT cstate %s, estate %s\n",
3419 cstate2s (t->cstate), estate2s (t->estate));
3420 LOG2 (level, "TTT kx_ctx %p, rekey_task %u, finish task %u\n",
3421 t->kx_ctx, t->rekey_task, t->kx_ctx ? t->kx_ctx->finish_task : 0);
3422 #if DUMP_KEYS_TO_STDERR
3423 LOG2 (level, "TTT my EPHM\t %s\n",
3424 GNUNET_h2s ((struct GNUNET_HashCode *) &kx_msg.ephemeral_key));
3425 LOG2 (level, "TTT peers EPHM:\t %s\n",
3426 GNUNET_h2s ((struct GNUNET_HashCode *) &t->peers_ephemeral_key));
3427 LOG2 (level, "TTT ENC key:\t %s\n",
3428 GNUNET_h2s ((struct GNUNET_HashCode *) &t->e_key));
3429 LOG2 (level, "TTT DEC key:\t %s\n",
3430 GNUNET_h2s ((struct GNUNET_HashCode *) &t->d_key));
3433 LOG2 (level, "TTT OLD ENC key:\t %s\n",
3434 GNUNET_h2s ((struct GNUNET_HashCode *) &t->kx_ctx->e_key_old));
3435 LOG2 (level, "TTT OLD DEC key:\t %s\n",
3436 GNUNET_h2s ((struct GNUNET_HashCode *) &t->kx_ctx->d_key_old));
3439 LOG2 (level, "TTT tq_head %p, tq_tail %p\n", t->tq_head, t->tq_tail);
3440 LOG2 (level, "TTT destroy %u\n", t->destroy_task);
3442 LOG2 (level, "TTT channels:\n");
3443 for (iterch = t->channel_head; NULL != iterch; iterch = iterch->next)
3445 LOG2 (level, "TTT - %s\n", GCCH_2s (iterch->ch));
3448 LOG2 (level, "TTT connections:\n");
3449 for (iterc = t->connection_head; NULL != iterc; iterc = iterc->next)
3451 GCC_debug (iterc->c, level);
3454 LOG2 (level, "TTT DEBUG TUNNEL END\n");
3459 * Iterate all tunnels.
3461 * @param iter Iterator.
3462 * @param cls Closure for @c iter.
3465 GCT_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter, void *cls)
3467 GNUNET_CONTAINER_multipeermap_iterate (tunnels, iter, cls);
3472 * Count all tunnels.
3474 * @return Number of tunnels to remote peers kept by this peer.
3477 GCT_count_all (void)
3479 return GNUNET_CONTAINER_multipeermap_size (tunnels);
3484 * Iterate all connections of a tunnel.
3486 * @param t Tunnel whose connections to iterate.
3487 * @param iter Iterator.
3488 * @param cls Closure for @c iter.
3491 GCT_iterate_connections (struct CadetTunnel *t, GCT_conn_iter iter, void *cls)
3493 struct CadetTConnection *ct;
3495 for (ct = t->connection_head; NULL != ct; ct = ct->next)
3501 * Iterate all channels of a tunnel.
3503 * @param t Tunnel whose channels to iterate.
3504 * @param iter Iterator.
3505 * @param cls Closure for @c iter.
3508 GCT_iterate_channels (struct CadetTunnel *t, GCT_chan_iter iter, void *cls)
3510 struct CadetTChannel *cht;
3512 for (cht = t->channel_head; NULL != cht; cht = cht->next)
3513 iter (cls, cht->ch);