2 This file is part of GNUnet.
3 Copyright (C) 2013 GNUnet e.V.
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., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, 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_YES
46 #define MIN_TUNNEL_BUFFER 8
47 #define MAX_TUNNEL_BUFFER 64
48 #define MAX_SKIPPED_KEYS 64
49 #define MAX_KEY_GAP 256
50 #define AX_HEADER_SIZE (sizeof (uint32_t) * 2\
51 + sizeof (struct GNUNET_CRYPTO_EcdhePublicKey))
54 /******************************************************************************/
55 /******************************** STRUCTS **********************************/
56 /******************************************************************************/
60 struct CadetTChannel *next;
61 struct CadetTChannel *prev;
62 struct CadetChannel *ch;
67 * Connection list and metadata.
69 struct CadetTConnection
74 struct CadetTConnection *next;
79 struct CadetTConnection *prev;
84 struct CadetConnection *c;
87 * Creation time, to keep oldest connection alive.
89 struct GNUNET_TIME_Absolute created;
92 * Connection throughput, to keep fastest connection alive.
99 * Encryption systems possible.
101 enum CadetTunnelEncryption
104 * Default Axolotl system.
111 * Struct to old keys for skipped messages while advancing the Axolotl ratchet.
113 struct CadetTunnelSkippedKey
118 struct CadetTunnelSkippedKey *next;
123 struct CadetTunnelSkippedKey *prev;
126 * When was this key stored (for timeout).
128 struct GNUNET_TIME_Absolute timestamp;
133 struct GNUNET_CRYPTO_SymmetricSessionKey HK;
138 struct GNUNET_CRYPTO_SymmetricSessionKey MK;
141 * Key number for a given HK.
148 * Axolotl data, according to https://github.com/trevp/axolotl/wiki .
150 struct CadetTunnelAxolotl
153 * A (double linked) list of stored message keys and associated header keys
154 * for "skipped" messages, i.e. messages that have not been
155 * received despite the reception of more recent messages, (head).
157 struct CadetTunnelSkippedKey *skipped_head;
160 * Skipped messages' keys DLL, tail.
162 struct CadetTunnelSkippedKey *skipped_tail;
165 * Elements in @a skipped_head <-> @a skipped_tail.
167 unsigned int skipped;
170 * 32-byte root key which gets updated by DH ratchet.
172 struct GNUNET_CRYPTO_SymmetricSessionKey RK;
175 * 32-byte header key (send).
177 struct GNUNET_CRYPTO_SymmetricSessionKey HKs;
180 * 32-byte header key (recv)
182 struct GNUNET_CRYPTO_SymmetricSessionKey HKr;
185 * 32-byte next header key (send).
187 struct GNUNET_CRYPTO_SymmetricSessionKey NHKs;
190 * 32-byte next header key (recv).
192 struct GNUNET_CRYPTO_SymmetricSessionKey NHKr;
195 * 32-byte chain keys (used for forward-secrecy updating, send).
197 struct GNUNET_CRYPTO_SymmetricSessionKey CKs;
200 * 32-byte chain keys (used for forward-secrecy updating, recv).
202 struct GNUNET_CRYPTO_SymmetricSessionKey CKr;
205 * ECDH for key exchange (A0 / B0).
207 struct GNUNET_CRYPTO_EcdhePrivateKey *kx_0;
210 * ECDH Ratchet key (send).
212 struct GNUNET_CRYPTO_EcdhePrivateKey *DHRs;
215 * ECDH Ratchet key (recv).
217 struct GNUNET_CRYPTO_EcdhePublicKey DHRr;
220 * Message number (reset to 0 with each new ratchet, next message to send).
225 * Message number (reset to 0 with each new ratchet, next message to recv).
230 * Previous message numbers (# of msgs sent under prev ratchet)
235 * True (#GNUNET_YES) if we have to send a new ratchet key in next msg.
240 * Number of messages recieved since our last ratchet advance.
241 * - If this counter = 0, we cannot send a new ratchet key in next msg.
242 * - If this counter > 0, we can (but don't yet have to) send a new key.
244 unsigned int ratchet_allowed;
247 * Number of messages recieved since our last ratchet advance.
248 * - If this counter = 0, we cannot send a new ratchet key in next msg.
249 * - If this counter > 0, we can (but don't yet have to) send a new key.
251 unsigned int ratchet_counter;
254 * When does this ratchet expire and a new one is triggered.
256 struct GNUNET_TIME_Absolute ratchet_expiration;
260 * Struct containing all information regarding a tunnel to a peer.
265 * Endpoint of the tunnel.
267 struct CadetPeer *peer;
270 * Type of encryption used in the tunnel.
272 enum CadetTunnelEncryption enc_type;
277 struct CadetTunnelAxolotl *ax;
280 * State of the tunnel connectivity.
282 enum CadetTunnelCState cstate;
285 * State of the tunnel encryption.
287 enum CadetTunnelEState estate;
290 * Peer's ephemeral key, to recreate @c e_key and @c d_key when own ephemeral
293 struct GNUNET_CRYPTO_EcdhePublicKey peers_ephemeral_key;
296 * Encryption ("our") key. It is only "confirmed" if kx_ctx is NULL.
298 struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
301 * Decryption ("their") key. It is only "confirmed" if kx_ctx is NULL.
303 struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
306 * Task to start the rekey process.
308 struct GNUNET_SCHEDULER_Task *rekey_task;
311 * Paths that are actively used to reach the destination peer.
313 struct CadetTConnection *connection_head;
314 struct CadetTConnection *connection_tail;
317 * Next connection number.
322 * Channels inside this tunnel.
324 struct CadetTChannel *channel_head;
325 struct CadetTChannel *channel_tail;
328 * Channel ID for the next created channel.
330 CADET_ChannelNumber next_chid;
333 * Destroy flag: if true, destroy on last message.
335 struct GNUNET_SCHEDULER_Task * destroy_task;
338 * Queued messages, to transmit once tunnel gets connected.
340 struct CadetTunnelDelayed *tq_head;
341 struct CadetTunnelDelayed *tq_tail;
344 * Task to trim connections if too many are present.
346 struct GNUNET_SCHEDULER_Task * trim_connections_task;
349 * Ephemeral message in the queue (to avoid queueing more than one).
351 struct CadetConnectionQueue *ephm_h;
354 * Pong message in the queue.
356 struct CadetConnectionQueue *pong_h;
361 * Struct used to save messages in a non-ready tunnel to send once connected.
363 struct CadetTunnelDelayed
368 struct CadetTunnelDelayed *next;
369 struct CadetTunnelDelayed *prev;
374 struct CadetTunnel *t;
377 * Tunnel queue given to the channel to cancel request. Update on send_queued.
379 struct CadetTunnelQueue *tq;
384 /* struct GNUNET_MessageHeader *msg; */
389 * Handle for messages queued but not yet sent.
391 struct CadetTunnelQueue
394 * Connection queue handle, to cancel if necessary.
396 struct CadetConnectionQueue *cq;
399 * Handle in case message hasn't been given to a connection yet.
401 struct CadetTunnelDelayed *tqd;
404 * Continuation to call once sent.
409 * Closure for @c cont.
415 /******************************************************************************/
416 /******************************* GLOBALS ***********************************/
417 /******************************************************************************/
420 * Global handle to the statistics service.
422 extern struct GNUNET_STATISTICS_Handle *stats;
425 * Local peer own ID (memory efficient handle).
427 extern GNUNET_PEER_Id myid;
430 * Local peer own ID (full value).
432 extern struct GNUNET_PeerIdentity my_full_id;
436 * Don't try to recover tunnels if shutting down.
438 extern int shutting_down;
442 * Set of all tunnels, in order to trigger a new exchange on rekey.
443 * Indexed by peer's ID.
445 static struct GNUNET_CONTAINER_MultiPeerMap *tunnels;
448 * Own Peer ID private key.
450 const static struct GNUNET_CRYPTO_EddsaPrivateKey *id_key;
453 /******************************** AXOLOTL ************************************/
456 * How many messages are needed to trigger a ratchet advance.
458 static unsigned long long ratchet_messages;
461 * How long until we trigger a ratched advance.
463 static struct GNUNET_TIME_Relative ratchet_time;
466 /******************************************************************************/
467 /******************************** STATIC ***********************************/
468 /******************************************************************************/
471 * Get string description for tunnel connectivity state.
473 * @param cs Tunnel state.
475 * @return String representation.
478 cstate2s (enum CadetTunnelCState cs)
484 case CADET_TUNNEL_NEW:
485 return "CADET_TUNNEL_NEW";
486 case CADET_TUNNEL_SEARCHING:
487 return "CADET_TUNNEL_SEARCHING";
488 case CADET_TUNNEL_WAITING:
489 return "CADET_TUNNEL_WAITING";
490 case CADET_TUNNEL_READY:
491 return "CADET_TUNNEL_READY";
492 case CADET_TUNNEL_SHUTDOWN:
493 return "CADET_TUNNEL_SHUTDOWN";
495 SPRINTF (buf, "%u (UNKNOWN STATE)", cs);
503 * Get string description for tunnel encryption state.
505 * @param es Tunnel state.
507 * @return String representation.
510 estate2s (enum CadetTunnelEState es)
516 case CADET_TUNNEL_KEY_UNINITIALIZED:
517 return "CADET_TUNNEL_KEY_UNINITIALIZED";
518 case CADET_TUNNEL_KEY_SENT:
519 return "CADET_TUNNEL_KEY_SENT";
520 case CADET_TUNNEL_KEY_PING:
521 return "CADET_TUNNEL_KEY_PING";
522 case CADET_TUNNEL_KEY_OK:
523 return "CADET_TUNNEL_KEY_OK";
524 case CADET_TUNNEL_KEY_REKEY:
525 return "CADET_TUNNEL_KEY_REKEY";
527 SPRINTF (buf, "%u (UNKNOWN STATE)", es);
535 * @brief Check if tunnel is ready to send traffic.
537 * Tunnel must be connected and with encryption correctly set up.
539 * @param t Tunnel to check.
541 * @return #GNUNET_YES if ready, #GNUNET_NO otherwise
544 is_ready (struct CadetTunnel *t)
550 conn_ok = CADET_TUNNEL_READY == t->cstate;
551 enc_ok = CADET_TUNNEL_KEY_OK == t->estate
552 || CADET_TUNNEL_KEY_REKEY == t->estate
553 || (CADET_TUNNEL_KEY_PING == t->estate
554 && CADET_Axolotl == t->enc_type);
555 ready = conn_ok && enc_ok;
556 ready = ready || GCT_is_loopback (t);
562 * Get the channel's buffer. ONLY FOR NON-LOOPBACK CHANNELS!!
564 * @param tch Tunnel's channel handle.
566 * @return Amount of messages the channel can still buffer towards the client.
569 get_channel_buffer (const struct CadetTChannel *tch)
573 /* If channel is incoming, is terminal in the FWD direction and fwd is YES */
574 fwd = GCCH_is_terminal (tch->ch, GNUNET_YES);
576 return GCCH_get_buffer (tch->ch, fwd);
581 * Get the channel's allowance status.
583 * @param tch Tunnel's channel handle.
585 * @return #GNUNET_YES if we allowed the client to send data to us.
588 get_channel_allowed (const struct CadetTChannel *tch)
592 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
593 fwd = GCCH_is_origin (tch->ch, GNUNET_YES);
595 return GCCH_get_allowed (tch->ch, fwd);
600 * Get the connection's buffer.
602 * @param tc Tunnel's connection handle.
604 * @return Amount of messages the connection can still buffer.
607 get_connection_buffer (const struct CadetTConnection *tc)
611 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
612 fwd = GCC_is_origin (tc->c, GNUNET_YES);
614 return GCC_get_buffer (tc->c, fwd);
619 * Get the connection's allowance.
621 * @param tc Tunnel's connection handle.
623 * @return Amount of messages we have allowed the next peer to send us.
626 get_connection_allowed (const struct CadetTConnection *tc)
630 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
631 fwd = GCC_is_origin (tc->c, GNUNET_YES);
633 return GCC_get_allowed (tc->c, fwd);
638 * Create a new Axolotl ephemeral (ratchet) key.
643 new_ephemeral (struct CadetTunnel *t)
645 GNUNET_free_non_null (t->ax->DHRs);
646 t->ax->DHRs = GNUNET_CRYPTO_ecdhe_key_create();
647 #if DUMP_KEYS_TO_STDERR
649 struct GNUNET_CRYPTO_EcdhePublicKey pub;
650 GNUNET_CRYPTO_ecdhe_key_get_public (t->ax->DHRs, &pub);
651 LOG (GNUNET_ERROR_TYPE_DEBUG, " new DHRs generated: pub %s\n",
652 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &pub));
661 * @param plaintext Content to HMAC.
662 * @param size Size of @c plaintext.
663 * @param iv Initialization vector for the message.
664 * @param key Key to use.
665 * @param hmac[out] Destination to store the HMAC.
668 t_hmac (const void *plaintext, size_t size,
669 uint32_t iv, const struct GNUNET_CRYPTO_SymmetricSessionKey *key,
670 struct GNUNET_CADET_Hash *hmac)
672 static const char ctx[] = "cadet authentication key";
673 struct GNUNET_CRYPTO_AuthKey auth_key;
674 struct GNUNET_HashCode hash;
676 #if DUMP_KEYS_TO_STDERR
677 LOG (GNUNET_ERROR_TYPE_INFO, " HMAC %u bytes with key %s\n", size,
678 GNUNET_i2s ((struct GNUNET_PeerIdentity *) key));
680 GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
685 /* Two step: CADET_Hash is only 256 bits, HashCode is 512. */
686 GNUNET_CRYPTO_hmac (&auth_key, plaintext, size, &hash);
687 GNUNET_memcpy (hmac, &hash, sizeof (*hmac));
694 * @param key Key to use.
695 * @param hash[out] Resulting HMAC.
696 * @param source Source key material (data to HMAC).
697 * @param len Length of @a source.
700 t_ax_hmac_hash (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
701 struct GNUNET_HashCode *hash,
702 void *source, unsigned int len)
704 static const char ctx[] = "axolotl HMAC-HASH";
705 struct GNUNET_CRYPTO_AuthKey auth_key;
707 GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
710 GNUNET_CRYPTO_hmac (&auth_key, source, len, hash);
715 * Derive a key from a HMAC-HASH.
717 * @param key Key to use for the HMAC.
718 * @param out Key to generate.
719 * @param source Source key material (data to HMAC).
720 * @param len Length of @a source.
723 t_hmac_derive_key (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
724 struct GNUNET_CRYPTO_SymmetricSessionKey *out,
725 void *source, unsigned int len)
727 static const char ctx[] = "axolotl derive key";
728 struct GNUNET_HashCode h;
730 t_ax_hmac_hash (key, &h, source, len);
731 GNUNET_CRYPTO_kdf (out, sizeof (*out), ctx, sizeof (ctx),
732 &h, sizeof (h), NULL);
737 * Encrypt data with the axolotl tunnel key.
739 * @param t Tunnel whose key to use.
740 * @param dst Destination for the encrypted data.
741 * @param src Source of the plaintext. Can overlap with @c dst.
742 * @param size Size of the plaintext.
744 * @return Size of the encrypted data.
747 t_ax_encrypt (struct CadetTunnel *t, void *dst, const void *src, size_t size)
749 struct GNUNET_CRYPTO_SymmetricSessionKey MK;
750 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
751 struct CadetTunnelAxolotl *ax;
753 struct GNUNET_TIME_Absolute start_time;
754 struct GNUNET_TIME_Relative duration;
756 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_ax_encrypt start\n");
757 start_time = GNUNET_TIME_absolute_get ();
761 ax->ratchet_counter++;
762 if (GNUNET_YES == ax->ratchet_allowed
763 && (ratchet_messages <= ax->ratchet_counter
764 || 0 == GNUNET_TIME_absolute_get_remaining (ax->ratchet_expiration).rel_value_us))
766 ax->ratchet_flag = GNUNET_YES;
769 if (GNUNET_YES == ax->ratchet_flag)
771 /* Advance ratchet */
772 struct GNUNET_CRYPTO_SymmetricSessionKey keys[3];
773 struct GNUNET_HashCode dh;
774 struct GNUNET_HashCode hmac;
775 static const char ctx[] = "axolotl ratchet";
780 /* RK, NHKs, CKs = KDF( HMAC-HASH(RK, DH(DHRs, DHRr)) ) */
781 GNUNET_CRYPTO_ecc_ecdh (ax->DHRs, &ax->DHRr, &dh);
782 t_ax_hmac_hash (&ax->RK, &hmac, &dh, sizeof (dh));
783 GNUNET_CRYPTO_kdf (keys, sizeof (keys), ctx, sizeof (ctx),
784 &hmac, sizeof (hmac), NULL);
791 ax->ratchet_flag = GNUNET_NO;
792 ax->ratchet_allowed = GNUNET_NO;
793 ax->ratchet_counter = 0;
794 ax->ratchet_expiration =
795 GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(), ratchet_time);
798 t_hmac_derive_key (&ax->CKs, &MK, "0", 1);
799 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &MK, NULL, 0, NULL);
801 #if DUMP_KEYS_TO_STDERR
802 LOG (GNUNET_ERROR_TYPE_DEBUG, " CKs: %s\n",
803 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->CKs));
804 LOG (GNUNET_ERROR_TYPE_INFO, " AX_ENC with key %u: %s\n", ax->Ns,
805 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &MK));
808 out_size = GNUNET_CRYPTO_symmetric_encrypt (src, size, &MK, &iv, dst);
810 t_hmac_derive_key (&ax->CKs, &ax->CKs, "1", 1);
812 duration = GNUNET_TIME_absolute_get_duration (start_time);
813 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_ax_encrypt duration %s\n",
814 GNUNET_STRINGS_relative_time_to_string (duration, GNUNET_YES));
815 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_ax_encrypt end\n");
822 * Decrypt data with the axolotl tunnel key.
824 * @param t Tunnel whose key to use.
825 * @param dst Destination for the decrypted data.
826 * @param src Source of the ciphertext. Can overlap with @c dst.
827 * @param size Size of the ciphertext.
829 * @return Size of the decrypted data.
832 t_ax_decrypt (struct CadetTunnel *t, void *dst, const void *src, size_t size)
834 struct GNUNET_CRYPTO_SymmetricSessionKey MK;
835 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
836 struct CadetTunnelAxolotl *ax;
839 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_ax_decrypt start\n");
843 t_hmac_derive_key (&ax->CKr, &MK, "0", 1);
844 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &MK, NULL, 0, NULL);
846 #if DUMP_KEYS_TO_STDERR
847 LOG (GNUNET_ERROR_TYPE_DEBUG, " CKr: %s\n",
848 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->CKr));
849 LOG (GNUNET_ERROR_TYPE_INFO, " AX_DEC with key %u: %s\n", ax->Nr,
850 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &MK));
853 GNUNET_assert (size >= sizeof (struct GNUNET_MessageHeader));
854 out_size = GNUNET_CRYPTO_symmetric_decrypt (src, size, &MK, &iv, dst);
855 GNUNET_assert (out_size == size);
857 t_hmac_derive_key (&ax->CKr, &ax->CKr, "1", 1);
859 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_ax_decrypt end\n");
866 * Encrypt header with the axolotl header key.
868 * @param t Tunnel whose key to use.
869 * @param msg Message whose header to encrypt.
872 t_h_encrypt (struct CadetTunnel *t, struct GNUNET_CADET_AX *msg)
874 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
875 struct CadetTunnelAxolotl *ax;
878 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_h_encrypt start\n");
881 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &ax->HKs, NULL, 0, NULL);
883 #if DUMP_KEYS_TO_STDERR
884 LOG (GNUNET_ERROR_TYPE_INFO, " AX_ENC_H with key %s\n",
885 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->HKs));
888 out_size = GNUNET_CRYPTO_symmetric_encrypt (&msg->Ns, AX_HEADER_SIZE,
889 &ax->HKs, &iv, &msg->Ns);
891 GNUNET_assert (AX_HEADER_SIZE == out_size);
893 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_ax_encrypt end\n");
898 * Decrypt header with the current axolotl header key.
900 * @param t Tunnel whose current ax HK to use.
901 * @param src Message whose header to decrypt.
902 * @param dst Where to decrypt header to.
905 t_h_decrypt (struct CadetTunnel *t, const struct GNUNET_CADET_AX *src,
906 struct GNUNET_CADET_AX *dst)
908 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
909 struct CadetTunnelAxolotl *ax;
912 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_h_decrypt start\n");
915 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &ax->HKr, NULL, 0, NULL);
917 #if DUMP_KEYS_TO_STDERR
918 LOG (GNUNET_ERROR_TYPE_INFO, " AX_DEC_H with key %s\n",
919 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->HKr));
922 out_size = GNUNET_CRYPTO_symmetric_decrypt (&src->Ns, AX_HEADER_SIZE,
923 &ax->HKr, &iv, &dst->Ns);
925 GNUNET_assert (AX_HEADER_SIZE == out_size);
927 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_h_decrypt end\n");
932 * Decrypt and verify data with the appropriate tunnel key and verify that the
933 * data has not been altered since it was sent by the remote peer.
935 * @param t Tunnel whose key to use.
936 * @param dst Destination for the plaintext.
937 * @param src Source of the message. Can overlap with @c dst.
938 * @param size Size of the message.
940 * @return Size of the decrypted data, -1 if an error was encountered.
943 try_old_ax_keys (struct CadetTunnel *t, void *dst,
944 const struct GNUNET_CADET_AX *src, size_t size)
946 struct CadetTunnelSkippedKey *key;
947 struct GNUNET_CADET_Hash *hmac;
948 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
949 struct GNUNET_CADET_AX plaintext_header;
950 struct GNUNET_CRYPTO_SymmetricSessionKey *valid_HK;
956 LOG (GNUNET_ERROR_TYPE_DEBUG, "Trying old keys\n");
957 hmac = &plaintext_header.hmac;
958 esize = size - sizeof (struct GNUNET_CADET_AX);
960 /* Find a correct Header Key */
961 for (key = t->ax->skipped_head; NULL != key; key = key->next)
963 #if DUMP_KEYS_TO_STDERR
964 LOG (GNUNET_ERROR_TYPE_DEBUG, " Trying hmac with key %s\n",
965 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &key->HK));
967 t_hmac (&src->Ns, AX_HEADER_SIZE + esize, 0, &key->HK, hmac);
968 if (0 == memcmp (hmac, &src->hmac, sizeof (*hmac)))
970 LOG (GNUNET_ERROR_TYPE_DEBUG, " hmac correct\n");
978 /* Should've been checked in -cadet_connection.c handle_cadet_encrypted. */
979 GNUNET_assert (size > sizeof (struct GNUNET_CADET_AX));
980 len = size - sizeof (struct GNUNET_CADET_AX);
981 GNUNET_assert (len >= sizeof (struct GNUNET_MessageHeader));
984 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &key->HK, NULL, 0, NULL);
985 res = GNUNET_CRYPTO_symmetric_decrypt (&src->Ns, AX_HEADER_SIZE,
986 &key->HK, &iv, &plaintext_header.Ns);
987 GNUNET_assert (AX_HEADER_SIZE == res);
988 LOG (GNUNET_ERROR_TYPE_DEBUG, " Message %u, previous: %u\n",
989 ntohl (plaintext_header.Ns), ntohl (plaintext_header.PNs));
991 /* Find the correct Message Key */
992 N = ntohl (plaintext_header.Ns);
993 while (NULL != key && N != key->Kn)
995 if (NULL == key || 0 != memcmp (&key->HK, valid_HK, sizeof (*valid_HK)))
998 #if DUMP_KEYS_TO_STDERR
999 LOG (GNUNET_ERROR_TYPE_INFO, " AX_DEC_H with skipped key %s\n",
1000 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &key->HK));
1001 LOG (GNUNET_ERROR_TYPE_INFO, " AX_DEC with skipped key %u: %s\n",
1002 key->Kn, GNUNET_i2s ((struct GNUNET_PeerIdentity *) &key->MK));
1005 /* Decrypt payload */
1006 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &key->MK, NULL, 0, NULL);
1007 res = GNUNET_CRYPTO_symmetric_decrypt (&src[1], len, &key->MK, &iv, dst);
1010 GNUNET_CONTAINER_DLL_remove (t->ax->skipped_head, t->ax->skipped_tail, key);
1012 GNUNET_free (key); /* GNUNET_free overwrites memory with 0xbaadf00d */
1019 * Delete a key from the list of skipped keys.
1021 * @param t Tunnel to delete from.
1022 * @param HKr Header Key to use.
1025 store_skipped_key (struct CadetTunnel *t,
1026 const struct GNUNET_CRYPTO_SymmetricSessionKey *HKr)
1028 struct CadetTunnelSkippedKey *key;
1030 key = GNUNET_new (struct CadetTunnelSkippedKey);
1031 key->timestamp = GNUNET_TIME_absolute_get ();
1032 key->Kn = t->ax->Nr;
1033 key->HK = t->ax->HKr;
1034 t_hmac_derive_key (&t->ax->CKr, &key->MK, "0", 1);
1035 #if DUMP_KEYS_TO_STDERR
1036 LOG (GNUNET_ERROR_TYPE_DEBUG, " storing MK for Nr %u: %s\n",
1037 key->Kn, GNUNET_i2s ((struct GNUNET_PeerIdentity *) &key->MK));
1038 LOG (GNUNET_ERROR_TYPE_DEBUG, " for CKr: %s\n",
1039 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &t->ax->CKr));
1041 t_hmac_derive_key (&t->ax->CKr, &t->ax->CKr, "1", 1);
1042 GNUNET_CONTAINER_DLL_insert (t->ax->skipped_head, t->ax->skipped_tail, key);
1049 * Delete a key from the list of skipped keys.
1051 * @param t Tunnel to delete from.
1052 * @param key Key to delete.
1055 delete_skipped_key (struct CadetTunnel *t, struct CadetTunnelSkippedKey *key)
1057 GNUNET_CONTAINER_DLL_remove (t->ax->skipped_head, t->ax->skipped_tail, key);
1064 * Stage skipped AX keys and calculate the message key.
1066 * Stores each HK and MK for skipped messages.
1068 * @param t Tunnel where to stage the keys.
1069 * @param HKr Header key.
1070 * @param Np Received meesage number.
1072 * @return GNUNET_OK if keys were stored.
1073 * GNUNET_SYSERR if an error ocurred (Np not expected).
1076 store_ax_keys (struct CadetTunnel *t,
1077 const struct GNUNET_CRYPTO_SymmetricSessionKey *HKr,
1083 gap = Np - t->ax->Nr;
1084 LOG (GNUNET_ERROR_TYPE_INFO, "Storing keys [%u, %u)\n", t->ax->Nr, Np);
1085 if (MAX_KEY_GAP < gap)
1087 /* Avoid DoS (forcing peer to do 2*33 chain HMAC operations) */
1088 /* TODO: start new key exchange on return */
1089 GNUNET_break_op (0);
1090 LOG (GNUNET_ERROR_TYPE_WARNING, "Got message %u, expected %u+\n",
1092 return GNUNET_SYSERR;
1096 /* Delayed message: don't store keys, flag to try old keys. */
1097 return GNUNET_SYSERR;
1100 while (t->ax->Nr < Np)
1101 store_skipped_key (t, HKr);
1103 while (t->ax->skipped > MAX_SKIPPED_KEYS)
1104 delete_skipped_key (t, t->ax->skipped_tail);
1111 * Decrypt and verify data with the appropriate tunnel key and verify that the
1112 * data has not been altered since it was sent by the remote peer.
1114 * @param t Tunnel whose key to use.
1115 * @param dst Destination for the plaintext.
1116 * @param src Source of the message. Can overlap with @c dst.
1117 * @param size Size of the message.
1119 * @return Size of the decrypted data, -1 if an error was encountered.
1122 t_ax_decrypt_and_validate (struct CadetTunnel *t, void *dst,
1123 const struct GNUNET_CADET_AX *src, size_t size)
1125 struct CadetTunnelAxolotl *ax;
1126 struct GNUNET_CADET_Hash msg_hmac;
1127 struct GNUNET_HashCode hmac;
1128 struct GNUNET_CADET_AX plaintext_header;
1135 esize = size - sizeof (struct GNUNET_CADET_AX);
1140 /* Try current HK */
1141 t_hmac (&src->Ns, AX_HEADER_SIZE + esize, 0, &ax->HKr, &msg_hmac);
1142 if (0 != memcmp (&msg_hmac, &src->hmac, sizeof (msg_hmac)))
1144 static const char ctx[] = "axolotl ratchet";
1145 struct GNUNET_CRYPTO_SymmetricSessionKey keys[3]; /* RKp, NHKp, CKp */
1146 struct GNUNET_CRYPTO_SymmetricSessionKey HK;
1147 struct GNUNET_HashCode dh;
1148 struct GNUNET_CRYPTO_EcdhePublicKey *DHRp;
1151 LOG (GNUNET_ERROR_TYPE_DEBUG, " trying next HK\n");
1152 t_hmac (&src->Ns, AX_HEADER_SIZE + esize, 0, &ax->NHKr, &msg_hmac);
1153 if (0 != memcmp (&msg_hmac, &src->hmac, sizeof (msg_hmac)))
1155 /* Try the skipped keys, if that fails, we're out of luck. */
1156 return try_old_ax_keys (t, dst, src, size);
1158 LOG (GNUNET_ERROR_TYPE_INFO, "next HK worked\n");
1162 t_h_decrypt (t, src, &plaintext_header);
1163 Np = ntohl (plaintext_header.Ns);
1164 PNp = ntohl (plaintext_header.PNs);
1165 DHRp = &plaintext_header.DHRs;
1166 store_ax_keys (t, &HK, PNp);
1168 /* RKp, NHKp, CKp = KDF (HMAC-HASH (RK, DH (DHRp, DHRs))) */
1169 GNUNET_CRYPTO_ecc_ecdh (ax->DHRs, DHRp, &dh);
1170 t_ax_hmac_hash (&ax->RK, &hmac, &dh, sizeof (dh));
1171 GNUNET_CRYPTO_kdf (keys, sizeof (keys), ctx, sizeof (ctx),
1172 &hmac, sizeof (hmac), NULL);
1174 /* Commit "purported" keys */
1180 ax->ratchet_allowed = GNUNET_YES;
1184 LOG (GNUNET_ERROR_TYPE_DEBUG, "current HK\n");
1185 t_h_decrypt (t, src, &plaintext_header);
1186 Np = ntohl (plaintext_header.Ns);
1187 PNp = ntohl (plaintext_header.PNs);
1189 LOG (GNUNET_ERROR_TYPE_INFO, " got AX Nr %u\n", Np);
1191 if (GNUNET_OK != store_ax_keys (t, &ax->HKr, Np))
1192 /* Try the skipped keys, if that fails, we're out of luck. */
1193 return try_old_ax_keys (t, dst, src, size);
1195 osize = t_ax_decrypt (t, dst, &src[1], esize);
1200 GNUNET_break_op (0);
1209 * Pick a connection on which send the next data message.
1211 * @param t Tunnel on which to send the message.
1213 * @return The connection on which to send the next message.
1215 static struct CadetConnection *
1216 tunnel_get_connection (struct CadetTunnel *t)
1218 struct CadetTConnection *iter;
1219 struct CadetConnection *best;
1221 unsigned int lowest_q;
1223 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GCT_2s (t));
1225 lowest_q = UINT_MAX;
1226 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1228 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
1229 GCC_2s (iter->c), GCC_get_state (iter->c));
1230 if (CADET_CONNECTION_READY == GCC_get_state (iter->c))
1232 qn = GCC_get_qn (iter->c, GCC_is_origin (iter->c, GNUNET_YES));
1233 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
1241 LOG (GNUNET_ERROR_TYPE_DEBUG, " selected: connection %s\n", GCC_2s (best));
1247 * Callback called when a queued message is sent.
1249 * Calculates the average time and connection packet tracking.
1251 * @param cls Closure (TunnelQueue handle).
1252 * @param c Connection this message was on.
1253 * @param q Connection queue handle (unused).
1254 * @param type Type of message sent.
1255 * @param fwd Was this a FWD going message?
1256 * @param size Size of the message.
1259 tun_message_sent (void *cls,
1260 struct CadetConnection *c,
1261 struct CadetConnectionQueue *q,
1262 uint16_t type, int fwd, size_t size)
1264 struct CadetTunnelQueue *qt = cls;
1265 struct CadetTunnel *t;
1267 LOG (GNUNET_ERROR_TYPE_DEBUG, "tun_message_sent\n");
1269 GNUNET_assert (NULL != qt->cont);
1270 t = NULL == c ? NULL : GCC_get_tunnel (c);
1271 qt->cont (qt->cont_cls, t, qt, type, size);
1277 count_queued_data (const struct CadetTunnel *t)
1279 struct CadetTunnelDelayed *iter;
1282 for (count = 0, iter = t->tq_head; iter != NULL; iter = iter->next)
1289 * Delete a queued message: either was sent or the channel was destroyed
1290 * before the tunnel's key exchange had a chance to finish.
1292 * @param tqd Delayed queue handle.
1295 unqueue_data (struct CadetTunnelDelayed *tqd)
1297 GNUNET_CONTAINER_DLL_remove (tqd->t->tq_head, tqd->t->tq_tail, tqd);
1303 * Cache a message to be sent once tunnel is online.
1305 * @param t Tunnel to hold the message.
1306 * @param msg Message itself (copy will be made).
1308 static struct CadetTunnelDelayed *
1309 queue_data (struct CadetTunnel *t, const struct GNUNET_MessageHeader *msg)
1311 struct CadetTunnelDelayed *tqd;
1312 uint16_t size = ntohs (msg->size);
1314 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue data on Tunnel %s\n", GCT_2s (t));
1316 GNUNET_assert (GNUNET_NO == is_ready (t));
1318 tqd = GNUNET_malloc (sizeof (struct CadetTunnelDelayed) + size);
1321 GNUNET_memcpy (&tqd[1], msg, size);
1322 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tqd);
1328 * Sends an already built message on a tunnel, encrypting it and
1329 * choosing the best connection.
1331 * @param message Message to send. Function modifies it.
1332 * @param t Tunnel on which this message is transmitted.
1333 * @param c Connection to use (autoselect if NULL).
1334 * @param force Force the tunnel to take the message (buffer overfill).
1335 * @param cont Continuation to call once message is really sent.
1336 * @param cont_cls Closure for @c cont.
1337 * @param existing_q In case this a transmission of previously queued data,
1338 * this should be TunnelQueue given to the client.
1340 * @return Handle to cancel message.
1341 * NULL if @c cont is NULL or an error happens and message is dropped.
1343 static struct CadetTunnelQueue *
1344 send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1345 struct CadetTunnel *t,
1346 struct CadetConnection *c,
1350 struct CadetTunnelQueue *existing_q)
1352 struct GNUNET_MessageHeader *msg;
1353 struct GNUNET_CADET_AX *ax_msg;
1354 struct CadetTunnelQueue *tq;
1355 size_t size = ntohs (message->size);
1356 char cbuf[sizeof (struct GNUNET_CADET_AX) + size] GNUNET_ALIGN;
1362 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GCT_2s (t));
1364 if (GNUNET_NO == is_ready (t))
1366 struct CadetTunnelDelayed *tqd;
1367 /* A non null existing_q indicates sending of queued data.
1368 * Should only happen after tunnel becomes ready.
1370 GNUNET_assert (NULL == existing_q);
1371 tqd = queue_data (t, message);
1374 tq = GNUNET_new (struct CadetTunnelQueue);
1378 tq->cont_cls = cont_cls;
1382 GNUNET_assert (GNUNET_NO == GCT_is_loopback (t));
1384 GNUNET_assert (CADET_Axolotl == t->enc_type);
1385 ax_msg = (struct GNUNET_CADET_AX *) cbuf;
1386 msg = &ax_msg->header;
1387 msg->size = htons (sizeof (struct GNUNET_CADET_AX) + size);
1388 msg->type = htons (GNUNET_MESSAGE_TYPE_CADET_AX);
1389 esize = t_ax_encrypt (t, &ax_msg[1], message, size);
1390 ax_msg->Ns = htonl (t->ax->Ns++);
1391 ax_msg->PNs = htonl (t->ax->PNs);
1392 GNUNET_CRYPTO_ecdhe_key_get_public (t->ax->DHRs, &ax_msg->DHRs);
1393 t_h_encrypt (t, ax_msg);
1394 t_hmac (&ax_msg->Ns, AX_HEADER_SIZE + esize, 0, &t->ax->HKs, &ax_msg->hmac);
1395 GNUNET_assert (esize == size);
1398 c = tunnel_get_connection (t);
1401 /* Why is tunnel 'ready'? Should have been queued! */
1402 if (NULL != t->destroy_task)
1405 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
1407 return NULL; /* Drop... */
1411 type = ntohs (message->type);
1414 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1415 case GNUNET_MESSAGE_TYPE_CADET_DATA_ACK:
1416 if (GNUNET_MESSAGE_TYPE_CADET_DATA == type)
1417 mid = ntohl (((struct GNUNET_CADET_Data *) message)->mid);
1419 mid = ntohl (((struct GNUNET_CADET_DataACK *) message)->mid);
1421 case GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE:
1422 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1423 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1424 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_ACK:
1425 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_NACK:
1429 LOG (GNUNET_ERROR_TYPE_ERROR, "type %s not valid\n", GC_m2s (type));
1431 LOG (GNUNET_ERROR_TYPE_DEBUG, "type %s\n", GC_m2s (type));
1433 fwd = GCC_is_origin (c, GNUNET_YES);
1437 GNUNET_break (NULL == GCC_send_prebuilt_message (msg, type, mid, c, fwd,
1438 force, NULL, NULL));
1441 if (NULL == existing_q)
1443 tq = GNUNET_new (struct CadetTunnelQueue); /* FIXME valgrind: leak*/
1450 tq->cq = GCC_send_prebuilt_message (msg, type, mid, c, fwd, force,
1451 &tun_message_sent, tq);
1452 GNUNET_assert (NULL != tq->cq);
1454 tq->cont_cls = cont_cls;
1461 * Send all cached messages that we can, tunnel is online.
1463 * @param t Tunnel that holds the messages. Cannot be loopback.
1466 send_queued_data (struct CadetTunnel *t)
1468 struct CadetTunnelDelayed *tqd;
1469 struct CadetTunnelDelayed *next;
1472 LOG (GNUNET_ERROR_TYPE_INFO, "Send queued data, tunnel %s\n", GCT_2s (t));
1474 if (GCT_is_loopback (t))
1480 if (GNUNET_NO == is_ready (t))
1482 LOG (GNUNET_ERROR_TYPE_WARNING, " not ready yet: %s/%s\n",
1483 estate2s (t->estate), cstate2s (t->cstate));
1487 room = GCT_get_connections_buffer (t);
1488 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
1489 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq head: %p\n", t->tq_head);
1490 for (tqd = t->tq_head; NULL != tqd && room > 0; tqd = next)
1492 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending queued data\n");
1495 send_prebuilt_message ((struct GNUNET_MessageHeader *) &tqd[1],
1496 tqd->t, NULL, GNUNET_YES,
1497 NULL != tqd->tq ? tqd->tq->cont : NULL,
1498 NULL != tqd->tq ? tqd->tq->cont_cls : NULL,
1502 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_send_queued_data end\n", GCP_2s (t->peer));
1507 * @brief Resend the AX KX until we complete the handshake.
1509 * @param cls Closure (tunnel).
1512 ax_kx_resend (void *cls)
1514 struct CadetTunnel *t = cls;
1516 t->rekey_task = NULL;
1517 if (CADET_TUNNEL_KEY_OK == t->estate)
1519 /* Should have been canceled on estate change */
1524 GCT_send_ax_kx (t, CADET_TUNNEL_KEY_SENT >= t->estate);
1529 * Callback called when a queued message is sent.
1531 * @param cls Closure.
1532 * @param c Connection this message was on.
1533 * @param type Type of message sent.
1534 * @param fwd Was this a FWD going message?
1535 * @param size Size of the message.
1538 ephm_sent (void *cls,
1539 struct CadetConnection *c,
1540 struct CadetConnectionQueue *q,
1541 uint16_t type, int fwd, size_t size)
1543 struct CadetTunnel *t = cls;
1544 LOG (GNUNET_ERROR_TYPE_DEBUG, "ephemeral sent %s\n", GC_m2s (type));
1548 if (CADET_TUNNEL_KEY_OK == t->estate)
1551 if (CADET_Axolotl == t->enc_type)
1553 if (NULL != t->rekey_task)
1556 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
1557 GNUNET_SCHEDULER_cancel (t->rekey_task);
1559 t->rekey_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS,
1566 * Sends key exchange message on a tunnel, choosing the best connection.
1567 * Should not be called on loopback tunnels.
1569 * @param t Tunnel on which this message is transmitted.
1570 * @param message Message to send. Function modifies it.
1572 * @return Handle to the message in the connection queue.
1574 static struct CadetConnectionQueue *
1575 send_kx (struct CadetTunnel *t,
1576 const struct GNUNET_MessageHeader *message)
1578 struct CadetConnection *c;
1579 struct GNUNET_CADET_KX *msg;
1580 size_t size = ntohs (message->size);
1581 char cbuf[sizeof (struct GNUNET_CADET_KX) + size];
1585 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT KX on Tunnel %s\n", GCT_2s (t));
1587 /* Avoid loopback. */
1588 if (GCT_is_loopback (t))
1593 type = ntohs (message->type);
1595 /* Even if tunnel is "being destroyed", send anyway.
1596 * Could be a response to a rekey initiated by remote peer,
1597 * who is trying to create a new channel!
1600 /* Must have a connection, or be looking for one. */
1601 if (NULL == t->connection_head)
1603 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s with no connection\n", GC_m2s (type));
1604 if (CADET_TUNNEL_SEARCHING != t->cstate)
1607 GCT_debug (t, GNUNET_ERROR_TYPE_ERROR);
1612 msg = (struct GNUNET_CADET_KX *) cbuf;
1613 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX);
1614 msg->header.size = htons (sizeof (struct GNUNET_CADET_KX) + size);
1615 c = tunnel_get_connection (t);
1618 if (NULL == t->destroy_task && CADET_TUNNEL_READY == t->cstate)
1621 GCT_debug (t, GNUNET_ERROR_TYPE_ERROR);
1627 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
1628 GNUNET_assert (NULL == t->ephm_h);
1631 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n", GC_m2s (type));
1634 GNUNET_memcpy (&msg[1], message, size);
1636 fwd = GCC_is_origin (c, GNUNET_YES);
1638 return GCC_send_prebuilt_message (&msg->header, type, 0, c,
1645 * Called only on shutdown, destroy every tunnel.
1647 * @param cls Closure (unused).
1648 * @param key Current public key.
1649 * @param value Value in the hash map (tunnel).
1651 * @return #GNUNET_YES, so we should continue to iterate,
1654 destroy_iterator (void *cls,
1655 const struct GNUNET_PeerIdentity *key,
1658 struct CadetTunnel *t = value;
1660 LOG (GNUNET_ERROR_TYPE_DEBUG,
1661 "GCT_shutdown destroying tunnel at %p\n", t);
1668 * Notify remote peer that we don't know a channel he is talking about,
1669 * probably CHANNEL_DESTROY was missed.
1671 * @param t Tunnel on which to notify.
1672 * @param gid ID of the channel.
1675 send_channel_destroy (struct CadetTunnel *t, unsigned int gid)
1677 struct GNUNET_CADET_ChannelManage msg;
1679 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY);
1680 msg.header.size = htons (sizeof (msg));
1681 msg.chid = htonl (gid);
1683 LOG (GNUNET_ERROR_TYPE_DEBUG,
1684 "WARNING destroying unknown channel %u on tunnel %s\n",
1686 send_prebuilt_message (&msg.header, t, NULL, GNUNET_YES, NULL, NULL, NULL);
1691 * Demultiplex data per channel and call appropriate channel handler.
1693 * @param t Tunnel on which the data came.
1694 * @param msg Data message.
1695 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1696 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1697 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1698 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1701 handle_data (struct CadetTunnel *t,
1702 const struct GNUNET_CADET_Data *msg,
1705 struct CadetChannel *ch;
1711 size = ntohs (msg->header.size);
1713 sizeof (struct GNUNET_CADET_Data) +
1714 sizeof (struct GNUNET_MessageHeader))
1719 type = ntohs (msg[1].header.type);
1720 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n", GC_m2s (type));
1721 SPRINTF (buf, "# received payload of type %hu", type);
1722 GNUNET_STATISTICS_update (stats, buf, 1, GNUNET_NO);
1726 ch = GCT_get_channel (t, ntohl (msg->chid));
1729 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
1731 LOG (GNUNET_ERROR_TYPE_DEBUG, "channel 0x%X unknown\n", ntohl (msg->chid));
1732 send_channel_destroy (t, ntohl (msg->chid));
1736 GCCH_handle_data (ch, msg, fwd);
1741 * Demultiplex data ACKs per channel and update appropriate channel buffer info.
1743 * @param t Tunnel on which the DATA ACK came.
1744 * @param msg DATA ACK message.
1745 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1746 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1747 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1748 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1751 handle_data_ack (struct CadetTunnel *t,
1752 const struct GNUNET_CADET_DataACK *msg,
1755 struct CadetChannel *ch;
1759 size = ntohs (msg->header.size);
1760 if (size != sizeof (struct GNUNET_CADET_DataACK))
1767 ch = GCT_get_channel (t, ntohl (msg->chid));
1770 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
1772 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1777 GCCH_handle_data_ack (ch, msg, fwd);
1782 * Handle channel create.
1784 * @param t Tunnel on which the message came.
1785 * @param msg ChannelCreate message.
1788 handle_ch_create (struct CadetTunnel *t,
1789 const struct GNUNET_CADET_ChannelCreate *msg)
1791 struct CadetChannel *ch;
1795 size = ntohs (msg->header.size);
1796 if (size != sizeof (struct GNUNET_CADET_ChannelCreate))
1798 GNUNET_break_op (0);
1803 ch = GCT_get_channel (t, ntohl (msg->chid));
1804 if (NULL != ch && ! GCT_is_loopback (t))
1806 /* Probably a retransmission, safe to ignore */
1807 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
1809 ch = GCCH_handle_create (t, msg);
1811 GCT_add_channel (t, ch);
1817 * Handle channel NACK: check correctness and call channel handler for NACKs.
1819 * @param t Tunnel on which the NACK came.
1820 * @param msg NACK message.
1823 handle_ch_nack (struct CadetTunnel *t,
1824 const struct GNUNET_CADET_ChannelManage *msg)
1826 struct CadetChannel *ch;
1830 size = ntohs (msg->header.size);
1831 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
1838 ch = GCT_get_channel (t, ntohl (msg->chid));
1841 GNUNET_STATISTICS_update (stats, "# channel NACK on unknown channel",
1843 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1848 GCCH_handle_nack (ch);
1853 * Handle a CHANNEL ACK (SYNACK/ACK).
1855 * @param t Tunnel on which the CHANNEL ACK came.
1856 * @param msg CHANNEL ACK message.
1857 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1858 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1859 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1860 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1863 handle_ch_ack (struct CadetTunnel *t,
1864 const struct GNUNET_CADET_ChannelManage *msg,
1867 struct CadetChannel *ch;
1871 size = ntohs (msg->header.size);
1872 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
1879 ch = GCT_get_channel (t, ntohl (msg->chid));
1882 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
1884 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1889 GCCH_handle_ack (ch, msg, fwd);
1894 * Handle a channel destruction message.
1896 * @param t Tunnel on which the message came.
1897 * @param msg Channel destroy message.
1898 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1899 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1900 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1901 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1904 handle_ch_destroy (struct CadetTunnel *t,
1905 const struct GNUNET_CADET_ChannelManage *msg,
1908 struct CadetChannel *ch;
1912 size = ntohs (msg->header.size);
1913 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
1920 ch = GCT_get_channel (t, ntohl (msg->chid));
1923 /* Probably a retransmission, safe to ignore */
1927 GCCH_handle_destroy (ch, msg, fwd);
1932 * Free Axolotl data.
1937 destroy_ax (struct CadetTunnel *t)
1942 GNUNET_free_non_null (t->ax->DHRs);
1943 GNUNET_free_non_null (t->ax->kx_0);
1944 while (NULL != t->ax->skipped_head)
1945 delete_skipped_key (t, t->ax->skipped_head);
1946 GNUNET_assert (0 == t->ax->skipped);
1948 GNUNET_free (t->ax);
1951 if (NULL != t->rekey_task)
1953 GNUNET_SCHEDULER_cancel (t->rekey_task);
1954 t->rekey_task = NULL;
1956 if (NULL != t->ephm_h)
1958 GCC_cancel (t->ephm_h);
1965 * Handle Axolotl handshake.
1967 * @param t Tunnel this message came on.
1968 * @param msg Key eXchange Pong message.
1971 handle_kx_ax (struct CadetTunnel *t, const struct GNUNET_CADET_AX_KX *msg)
1973 struct CadetTunnelAxolotl *ax;
1974 struct GNUNET_HashCode key_material[3];
1975 struct GNUNET_CRYPTO_SymmetricSessionKey keys[5];
1976 const char salt[] = "CADET Axolotl salt";
1977 const struct GNUNET_PeerIdentity *pid;
1980 LOG (GNUNET_ERROR_TYPE_INFO, "<== { AX_KX} on %s\n", GCT_2s (t));
1984 /* Something is wrong if ax is NULL. Whose fault it is? */
1985 GNUNET_break (CADET_Axolotl == t->enc_type);
1990 pid = GCT_get_destination (t);
1991 if (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, pid))
1992 am_I_alice = GNUNET_YES;
1993 else if (0 < GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, pid))
1994 am_I_alice = GNUNET_NO;
1997 GNUNET_break_op (0);
2001 if (0 != (GNUNET_CADET_AX_KX_FLAG_FORCE_REPLY & ntohl (msg->flags)))
2003 if (NULL != t->rekey_task)
2005 GNUNET_SCHEDULER_cancel (t->rekey_task);
2006 t->rekey_task = NULL;
2008 GCT_send_ax_kx (t, GNUNET_NO);
2011 if (0 == memcmp (&ax->DHRr, &msg->ratchet_key, sizeof(msg->ratchet_key)))
2013 LOG (GNUNET_ERROR_TYPE_INFO, " known ratchet key, exit\n");
2017 LOG (GNUNET_ERROR_TYPE_INFO, " is Alice? %s\n", am_I_alice ? "YES" : "NO");
2019 ax->DHRr = msg->ratchet_key;
2022 if (GNUNET_YES == am_I_alice)
2024 GNUNET_CRYPTO_eddsa_ecdh (id_key, /* A */
2025 &msg->ephemeral_key, /* B0 */
2030 GNUNET_CRYPTO_ecdh_eddsa (ax->kx_0, /* B0 */
2031 &pid->public_key, /* A */
2036 if (GNUNET_YES == am_I_alice)
2038 GNUNET_CRYPTO_ecdh_eddsa (ax->kx_0, /* A0 */
2039 &pid->public_key, /* B */
2044 GNUNET_CRYPTO_eddsa_ecdh (id_key, /* A */
2045 &msg->ephemeral_key, /* B0 */
2052 /* (This is the triple-DH, we could probably safely skip this,
2053 as A0/B0 are already in the key material.) */
2054 GNUNET_CRYPTO_ecc_ecdh (ax->kx_0, /* A0 or B0 */
2055 &msg->ephemeral_key, /* B0 or A0 */
2058 #if DUMP_KEYS_TO_STDERR
2061 for (i = 0; i < 3; i++)
2062 LOG (GNUNET_ERROR_TYPE_INFO, "km[%u]: %s\n",
2063 i, GNUNET_h2s (&key_material[i]));
2068 GNUNET_CRYPTO_kdf (keys, sizeof (keys),
2069 salt, sizeof (salt),
2070 &key_material, sizeof (key_material), NULL);
2072 if (0 == memcmp (&ax->RK, &keys[0], sizeof(ax->RK)))
2074 LOG (GNUNET_ERROR_TYPE_INFO, " known handshake key, exit\n");
2078 if (GNUNET_YES == am_I_alice)
2084 ax->ratchet_flag = GNUNET_YES;
2092 ax->ratchet_flag = GNUNET_NO;
2093 ax->ratchet_allowed = GNUNET_NO;
2094 ax->ratchet_counter = 0;
2095 ax->ratchet_expiration =
2096 GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(), ratchet_time);
2101 GCT_change_estate (t, CADET_TUNNEL_KEY_PING);
2102 send_queued_data (t);
2107 * Demultiplex by message type and call appropriate handler for a message
2108 * towards a channel of a local tunnel.
2110 * @param t Tunnel this message came on.
2111 * @param msgh Message header.
2112 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2113 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2114 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2115 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2118 handle_decrypted (struct CadetTunnel *t,
2119 const struct GNUNET_MessageHeader *msgh,
2125 type = ntohs (msgh->type);
2126 LOG (GNUNET_ERROR_TYPE_DEBUG, "<-- %s on %s\n", GC_m2s (type), GCT_2s (t));
2127 SPRINTF (buf, "# received encrypted of type %hu (%s)", type, GC_m2s (type));
2128 GNUNET_STATISTICS_update (stats, buf, 1, GNUNET_NO);
2132 case GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE:
2133 /* Do nothing, connection aleady got updated. */
2134 GNUNET_STATISTICS_update (stats, "# keepalives received", 1, GNUNET_NO);
2137 case GNUNET_MESSAGE_TYPE_CADET_DATA:
2138 /* Don't send hop ACK, wait for client to ACK */
2139 handle_data (t, (struct GNUNET_CADET_Data *) msgh, fwd);
2142 case GNUNET_MESSAGE_TYPE_CADET_DATA_ACK:
2143 handle_data_ack (t, (struct GNUNET_CADET_DataACK *) msgh, fwd);
2146 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
2147 handle_ch_create (t, (struct GNUNET_CADET_ChannelCreate *) msgh);
2150 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_NACK:
2151 handle_ch_nack (t, (struct GNUNET_CADET_ChannelManage *) msgh);
2154 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_ACK:
2155 handle_ch_ack (t, (struct GNUNET_CADET_ChannelManage *) msgh, fwd);
2158 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
2159 handle_ch_destroy (t, (struct GNUNET_CADET_ChannelManage *) msgh, fwd);
2163 GNUNET_break_op (0);
2164 LOG (GNUNET_ERROR_TYPE_WARNING,
2165 "end-to-end message not known (%u)\n",
2166 ntohs (msgh->type));
2167 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
2172 /******************************************************************************/
2173 /******************************** API ***********************************/
2174 /******************************************************************************/
2176 * Decrypt old format and demultiplex by message type. Call appropriate handler
2177 * for a message towards a channel of a local tunnel.
2179 * @param t Tunnel this message came on.
2180 * @param msg Message header.
2183 GCT_handle_encrypted (struct CadetTunnel *t,
2184 const struct GNUNET_MessageHeader *msg)
2186 uint16_t size = ntohs (msg->size);
2190 const struct GNUNET_MessageHeader *msgh;
2193 type = ntohs (msg->type);
2196 case GNUNET_MESSAGE_TYPE_CADET_AX:
2198 const struct GNUNET_CADET_AX *emsg;
2200 GNUNET_STATISTICS_update (stats, "# received Axolotl", 1, GNUNET_NO);
2201 emsg = (const struct GNUNET_CADET_AX *) msg;
2202 decrypted_size = t_ax_decrypt_and_validate (t, cbuf, emsg, size);
2206 GNUNET_break_op (0);
2210 if (-1 == decrypted_size)
2212 GNUNET_STATISTICS_update (stats, "# unable to decrypt", 1, GNUNET_NO);
2213 if (CADET_TUNNEL_KEY_PING <= t->estate)
2215 GNUNET_break_op (0);
2216 LOG (GNUNET_ERROR_TYPE_WARNING, "Wrong crypto, tunnel %s\n", GCT_2s (t));
2217 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
2221 GCT_change_estate (t, CADET_TUNNEL_KEY_OK);
2223 /* FIXME: this is bad, as the structs returned from
2224 this loop may be unaligned, see util's MST for
2225 how to do this right. */
2227 while (off + sizeof (struct GNUNET_MessageHeader) <= decrypted_size)
2231 msgh = (const struct GNUNET_MessageHeader *) &cbuf[off];
2232 msize = ntohs (msgh->size);
2233 if (msize < sizeof (struct GNUNET_MessageHeader))
2235 GNUNET_break_op (0);
2238 if (off + msize < decrypted_size)
2240 GNUNET_break_op (0);
2243 handle_decrypted (t, msgh, GNUNET_SYSERR);
2250 * Demultiplex an encapsulated KX message by message type.
2252 * @param t Tunnel on which the message came.
2253 * @param message Payload of KX message.
2255 * FIXME: not needed anymore
2256 * - substitute with call to kx_ax
2257 * - eliminate encapsulation
2260 GCT_handle_kx (struct CadetTunnel *t,
2261 const struct GNUNET_MessageHeader *message)
2266 type = ntohs (message->type);
2267 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message received: %s\n", GC_m2s (type));
2268 sprintf (buf, "# received KX of type %hu (%s)", type, GC_m2s (type));
2269 GNUNET_STATISTICS_update (stats, buf, 1, GNUNET_NO);
2272 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
2273 handle_kx_ax (t, (const struct GNUNET_CADET_AX_KX *) message);
2276 GNUNET_break_op (0);
2277 LOG (GNUNET_ERROR_TYPE_WARNING, "kx message %s unknown\n", GC_m2s (type));
2282 * Initialize the tunnel subsystem.
2284 * @param c Configuration handle.
2285 * @param key ECC private key, to derive all other keys and do crypto.
2288 GCT_init (const struct GNUNET_CONFIGURATION_Handle *c,
2289 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
2291 unsigned int expected_overhead;
2293 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
2295 expected_overhead = 0;
2296 expected_overhead += sizeof (struct GNUNET_CADET_AX);
2297 expected_overhead += sizeof (struct GNUNET_CADET_Data);
2298 expected_overhead += sizeof (struct GNUNET_CADET_ACK);
2299 GNUNET_assert (GNUNET_CONSTANTS_CADET_P2P_OVERHEAD == expected_overhead);
2302 GNUNET_CONFIGURATION_get_value_number (c,
2307 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
2311 ratchet_messages = 64;
2314 GNUNET_CONFIGURATION_get_value_time (c,
2319 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
2320 "CADET", "RATCHET_TIME", "USING DEFAULT");
2321 ratchet_time = GNUNET_TIME_UNIT_HOURS;
2326 tunnels = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
2331 * Shut down the tunnel subsystem.
2336 LOG (GNUNET_ERROR_TYPE_DEBUG, "Shutting down tunnels\n");
2337 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &destroy_iterator, NULL);
2338 GNUNET_CONTAINER_multipeermap_destroy (tunnels);
2345 * @param destination Peer this tunnel is towards.
2347 struct CadetTunnel *
2348 GCT_new (struct CadetPeer *destination)
2350 struct CadetTunnel *t;
2352 t = GNUNET_new (struct CadetTunnel);
2354 t->peer = destination;
2357 GNUNET_CONTAINER_multipeermap_put (tunnels, GCP_get_id (destination), t,
2358 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2364 t->ax = GNUNET_new (struct CadetTunnelAxolotl);
2366 t->ax->kx_0 = GNUNET_CRYPTO_ecdhe_key_create ();
2372 * Change the tunnel's connection state.
2374 * @param t Tunnel whose connection state to change.
2375 * @param cstate New connection state.
2378 GCT_change_cstate (struct CadetTunnel* t, enum CadetTunnelCState cstate)
2382 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s cstate %s => %s\n",
2383 GCP_2s (t->peer), cstate2s (t->cstate), cstate2s (cstate));
2384 if (myid != GCP_get_short_id (t->peer) &&
2385 CADET_TUNNEL_READY != t->cstate &&
2386 CADET_TUNNEL_READY == cstate)
2389 if (CADET_TUNNEL_KEY_OK == t->estate)
2391 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered send queued data\n");
2392 send_queued_data (t);
2394 else if (CADET_TUNNEL_KEY_UNINITIALIZED == t->estate)
2396 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered kx\n");
2397 GCT_send_ax_kx (t, GNUNET_NO);
2401 LOG (GNUNET_ERROR_TYPE_DEBUG, "estate %s\n", estate2s (t->estate));
2406 if (CADET_TUNNEL_READY == cstate
2407 && CONNECTIONS_PER_TUNNEL <= GCT_count_connections (t))
2409 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered stop dht\n");
2410 GCP_stop_search (t->peer);
2416 * Change the tunnel encryption state.
2418 * If the encryption state changes to OK, stop the rekey task.
2420 * @param t Tunnel whose encryption state to change, or NULL.
2421 * @param state New encryption state.
2424 GCT_change_estate (struct CadetTunnel* t, enum CadetTunnelEState state)
2426 enum CadetTunnelEState old;
2433 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s estate was %s\n",
2434 GCP_2s (t->peer), estate2s (old));
2435 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s estate is now %s\n",
2436 GCP_2s (t->peer), estate2s (t->estate));
2438 if (CADET_TUNNEL_KEY_OK != old && CADET_TUNNEL_KEY_OK == t->estate)
2440 if (NULL != t->rekey_task)
2442 GNUNET_SCHEDULER_cancel (t->rekey_task);
2443 t->rekey_task = NULL;
2445 /* Send queued data if tunnel is not loopback */
2446 if (myid != GCP_get_short_id (t->peer))
2447 send_queued_data (t);
2453 * @brief Check if tunnel has too many connections, and remove one if necessary.
2455 * Currently this means the newest connection, unless it is a direct one.
2456 * Implemented as a task to avoid freeing a connection that is in the middle
2457 * of being created/processed.
2459 * @param cls Closure (Tunnel to check).
2462 trim_connections (void *cls)
2464 struct CadetTunnel *t = cls;
2466 t->trim_connections_task = NULL;
2467 if (GCT_count_connections (t) > 2 * CONNECTIONS_PER_TUNNEL)
2469 struct CadetTConnection *iter;
2470 struct CadetTConnection *c;
2472 for (c = iter = t->connection_head; NULL != iter; iter = iter->next)
2474 if ((iter->created.abs_value_us > c->created.abs_value_us)
2475 && GNUNET_NO == GCC_is_direct (iter->c))
2482 LOG (GNUNET_ERROR_TYPE_DEBUG, "Too many connections on tunnel %s\n",
2484 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying connection %s\n",
2497 * Add a connection to a tunnel.
2500 * @param c Connection.
2503 GCT_add_connection (struct CadetTunnel *t, struct CadetConnection *c)
2505 struct CadetTConnection *aux;
2507 GNUNET_assert (NULL != c);
2509 LOG (GNUNET_ERROR_TYPE_DEBUG, "add connection %s\n", GCC_2s (c));
2510 LOG (GNUNET_ERROR_TYPE_DEBUG, " to tunnel %s\n", GCT_2s (t));
2511 for (aux = t->connection_head; aux != NULL; aux = aux->next)
2515 aux = GNUNET_new (struct CadetTConnection);
2517 aux->created = GNUNET_TIME_absolute_get ();
2519 GNUNET_CONTAINER_DLL_insert (t->connection_head, t->connection_tail, aux);
2521 if (CADET_TUNNEL_SEARCHING == t->cstate)
2522 GCT_change_cstate (t, CADET_TUNNEL_WAITING);
2524 if (NULL != t->trim_connections_task)
2525 t->trim_connections_task = GNUNET_SCHEDULER_add_now (&trim_connections, t);
2530 * Remove a connection from a tunnel.
2533 * @param c Connection.
2536 GCT_remove_connection (struct CadetTunnel *t,
2537 struct CadetConnection *c)
2539 struct CadetTConnection *aux;
2540 struct CadetTConnection *next;
2543 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing connection %s from tunnel %s\n",
2544 GCC_2s (c), GCT_2s (t));
2545 for (aux = t->connection_head; aux != NULL; aux = next)
2550 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
2555 conns = GCT_count_connections (t);
2557 && NULL == t->destroy_task
2558 && CADET_TUNNEL_SHUTDOWN != t->cstate
2559 && GNUNET_NO == shutting_down)
2561 if (0 == GCT_count_any_connections (t))
2562 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2564 GCT_change_cstate (t, CADET_TUNNEL_WAITING);
2567 /* Start new connections if needed */
2568 if (CONNECTIONS_PER_TUNNEL > conns
2569 && CADET_TUNNEL_SHUTDOWN != t->cstate
2570 && GNUNET_NO == shutting_down)
2572 LOG (GNUNET_ERROR_TYPE_DEBUG, " too few connections, getting new ones\n");
2573 GCP_connect (t->peer); /* Will change cstate to WAITING when possible */
2577 /* If not marked as ready, no change is needed */
2578 if (CADET_TUNNEL_READY != t->cstate)
2581 /* Check if any connection is ready to maintain cstate */
2582 for (aux = t->connection_head; aux != NULL; aux = aux->next)
2583 if (CADET_CONNECTION_READY == GCC_get_state (aux->c))
2589 * Add a channel to a tunnel.
2592 * @param ch Channel.
2595 GCT_add_channel (struct CadetTunnel *t, struct CadetChannel *ch)
2597 struct CadetTChannel *aux;
2599 GNUNET_assert (NULL != ch);
2601 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
2603 for (aux = t->channel_head; aux != NULL; aux = aux->next)
2605 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
2610 aux = GNUNET_new (struct CadetTChannel);
2612 LOG (GNUNET_ERROR_TYPE_DEBUG,
2613 " adding %p to %p\n", aux, t->channel_head);
2614 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head,
2618 if (NULL != t->destroy_task)
2620 GNUNET_SCHEDULER_cancel (t->destroy_task);
2621 t->destroy_task = NULL;
2622 LOG (GNUNET_ERROR_TYPE_DEBUG, " undo destroy!\n");
2628 * Remove a channel from a tunnel.
2631 * @param ch Channel.
2634 GCT_remove_channel (struct CadetTunnel *t, struct CadetChannel *ch)
2636 struct CadetTChannel *aux;
2638 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
2639 for (aux = t->channel_head; aux != NULL; aux = aux->next)
2643 LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GCCH_2s (ch));
2644 GNUNET_CONTAINER_DLL_remove (t->channel_head,
2655 * Search for a channel by global ID.
2657 * @param t Tunnel containing the channel.
2658 * @param chid Public channel number.
2660 * @return channel handler, NULL if doesn't exist
2662 struct CadetChannel *
2663 GCT_get_channel (struct CadetTunnel *t, CADET_ChannelNumber chid)
2665 struct CadetTChannel *iter;
2670 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2672 if (GCCH_get_id (iter->ch) == chid)
2676 return NULL == iter ? NULL : iter->ch;
2681 * @brief Destroy a tunnel and free all resources.
2683 * Should only be called a while after the tunnel has been marked as destroyed,
2684 * in case there is a new channel added to the same peer shortly after marking
2685 * the tunnel. This way we avoid a new public key handshake.
2687 * @param cls Closure (tunnel to destroy).
2690 delayed_destroy (void *cls)
2692 struct CadetTunnel *t = cls;
2693 struct CadetTConnection *iter;
2695 t->destroy_task = NULL;
2696 LOG (GNUNET_ERROR_TYPE_DEBUG,
2697 "delayed destroying tunnel %p\n",
2699 t->cstate = CADET_TUNNEL_SHUTDOWN;
2700 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2702 GCC_send_destroy (iter->c);
2709 * Tunnel is empty: destroy it.
2711 * Notifies all connections about the destruction.
2713 * @param t Tunnel to destroy.
2716 GCT_destroy_empty (struct CadetTunnel *t)
2718 if (GNUNET_YES == shutting_down)
2719 return; /* Will be destroyed immediately anyway */
2721 if (NULL != t->destroy_task)
2723 LOG (GNUNET_ERROR_TYPE_WARNING,
2724 "Tunnel %s is already scheduled for destruction. Tunnel debug dump:\n",
2726 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
2728 /* should never happen, tunnel can only become empty once, and the
2729 * task identifier should be NO_TASK (cleaned when the tunnel was created
2730 * or became un-empty)
2735 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s empty: scheduling destruction\n",
2738 // FIXME make delay a config option
2739 t->destroy_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
2740 &delayed_destroy, t);
2741 LOG (GNUNET_ERROR_TYPE_DEBUG, "Scheduled destroy of %p as %p\n",
2742 t, t->destroy_task);
2747 * Destroy tunnel if empty (no more channels).
2749 * @param t Tunnel to destroy if empty.
2752 GCT_destroy_if_empty (struct CadetTunnel *t)
2754 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s destroy if empty\n", GCT_2s (t));
2755 if (0 < GCT_count_channels (t))
2758 GCT_destroy_empty (t);
2763 * Destroy the tunnel.
2765 * This function does not generate any warning traffic to clients or peers.
2768 * Cancel messages belonging to this tunnel queued to neighbors.
2769 * Free any allocated resources linked to the tunnel.
2771 * @param t The tunnel to destroy.
2774 GCT_destroy (struct CadetTunnel *t)
2776 struct CadetTConnection *iter_c;
2777 struct CadetTConnection *next_c;
2778 struct CadetTChannel *iter_ch;
2779 struct CadetTChannel *next_ch;
2780 unsigned int keepalives_queued;
2785 LOG (GNUNET_ERROR_TYPE_DEBUG,
2786 "destroying tunnel %s\n",
2788 GNUNET_break (GNUNET_YES ==
2789 GNUNET_CONTAINER_multipeermap_remove (tunnels,
2790 GCP_get_id (t->peer), t));
2792 for (iter_c = t->connection_head; NULL != iter_c; iter_c = next_c)
2794 next_c = iter_c->next;
2795 GCC_destroy (iter_c->c);
2797 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = next_ch)
2799 next_ch = iter_ch->next;
2800 GCCH_destroy (iter_ch->ch);
2801 /* Should only happen on shutdown, but it's ok. */
2803 keepalives_queued = 0;
2804 while (NULL != t->tq_head)
2806 /* Should have been cleaned by destuction of channel. */
2807 struct GNUNET_MessageHeader *mh;
2810 mh = (struct GNUNET_MessageHeader *) &t->tq_head[1];
2811 type = ntohs (mh->type);
2812 if (0 == keepalives_queued && GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE == type)
2814 keepalives_queued = 1;
2815 LOG (GNUNET_ERROR_TYPE_DEBUG,
2816 "one keepalive left behind on tunnel shutdown\n");
2818 else if (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY == type)
2820 LOG (GNUNET_ERROR_TYPE_WARNING,
2821 "tunnel destroyed before a CHANNEL_DESTROY was sent to peer\n");
2826 LOG (GNUNET_ERROR_TYPE_ERROR,
2827 "message left behind on tunnel shutdown: %s\n",
2830 unqueue_data (t->tq_head);
2834 if (NULL != t->destroy_task)
2836 LOG (GNUNET_ERROR_TYPE_DEBUG,
2837 "cancelling dest: %p\n",
2839 GNUNET_SCHEDULER_cancel (t->destroy_task);
2840 t->destroy_task = NULL;
2843 if (NULL != t->trim_connections_task)
2845 LOG (GNUNET_ERROR_TYPE_DEBUG, "cancelling trim: %p\n",
2846 t->trim_connections_task);
2847 GNUNET_SCHEDULER_cancel (t->trim_connections_task);
2848 t->trim_connections_task = NULL;
2851 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2852 GCP_set_tunnel (t->peer, NULL);
2854 if (NULL != t->rekey_task)
2856 GNUNET_SCHEDULER_cancel (t->rekey_task);
2857 t->rekey_task = NULL;
2867 * @brief Use the given path for the tunnel.
2868 * Update the next and prev hops (and RCs).
2869 * (Re)start the path refresh in case the tunnel is locally owned.
2871 * @param t Tunnel to update.
2872 * @param p Path to use.
2874 * @return Connection created.
2876 struct CadetConnection *
2877 GCT_use_path (struct CadetTunnel *t, struct CadetPeerPath *path)
2879 struct CadetConnection *c;
2880 struct GNUNET_CADET_Hash cid;
2881 unsigned int own_pos;
2883 if (NULL == t || NULL == path)
2889 if (CADET_TUNNEL_SHUTDOWN == t->cstate)
2895 for (own_pos = 0; own_pos < path->length; own_pos++)
2897 if (path->peers[own_pos] == myid)
2900 if (own_pos >= path->length)
2902 GNUNET_break_op (0);
2906 GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE, &cid, sizeof (cid));
2907 c = GCC_new (&cid, t, path, own_pos);
2910 /* Path was flawed */
2913 GCT_add_connection (t, c);
2919 * Count all created connections of a tunnel. Not necessarily ready connections!
2921 * @param t Tunnel on which to count.
2923 * @return Number of connections created, either being established or ready.
2926 GCT_count_any_connections (struct CadetTunnel *t)
2928 struct CadetTConnection *iter;
2934 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2942 * Count established (ready) connections of a tunnel.
2944 * @param t Tunnel on which to count.
2946 * @return Number of connections.
2949 GCT_count_connections (struct CadetTunnel *t)
2951 struct CadetTConnection *iter;
2957 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2958 if (CADET_CONNECTION_READY == GCC_get_state (iter->c))
2966 * Count channels of a tunnel.
2968 * @param t Tunnel on which to count.
2970 * @return Number of channels.
2973 GCT_count_channels (struct CadetTunnel *t)
2975 struct CadetTChannel *iter;
2978 for (count = 0, iter = t->channel_head;
2980 iter = iter->next, count++) /* skip */;
2987 * Get the connectivity state of a tunnel.
2991 * @return Tunnel's connectivity state.
2993 enum CadetTunnelCState
2994 GCT_get_cstate (struct CadetTunnel *t)
2999 return (enum CadetTunnelCState) -1;
3006 * Get the encryption state of a tunnel.
3010 * @return Tunnel's encryption state.
3012 enum CadetTunnelEState
3013 GCT_get_estate (struct CadetTunnel *t)
3018 return (enum CadetTunnelEState) -1;
3024 * Get the maximum buffer space for a tunnel towards a local client.
3028 * @return Biggest buffer space offered by any channel in the tunnel.
3031 GCT_get_channels_buffer (struct CadetTunnel *t)
3033 struct CadetTChannel *iter;
3034 unsigned int buffer;
3035 unsigned int ch_buf;
3037 if (NULL == t->channel_head)
3039 /* Probably getting buffer for a channel create/handshake. */
3040 LOG (GNUNET_ERROR_TYPE_DEBUG, " no channels, allow max\n");
3041 return MIN_TUNNEL_BUFFER;
3045 for (iter = t->channel_head; NULL != iter; iter = iter->next)
3047 ch_buf = get_channel_buffer (iter);
3048 if (ch_buf > buffer)
3051 if (MIN_TUNNEL_BUFFER > buffer)
3052 return MIN_TUNNEL_BUFFER;
3054 if (MAX_TUNNEL_BUFFER < buffer)
3057 return MAX_TUNNEL_BUFFER;
3064 * Get the total buffer space for a tunnel for P2P traffic.
3068 * @return Buffer space offered by all connections in the tunnel.
3071 GCT_get_connections_buffer (struct CadetTunnel *t)
3073 struct CadetTConnection *iter;
3074 unsigned int buffer;
3076 if (GNUNET_NO == is_ready (t))
3078 if (count_queued_data (t) >= 3)
3085 for (iter = t->connection_head; NULL != iter; iter = iter->next)
3087 if (GCC_get_state (iter->c) != CADET_CONNECTION_READY)
3091 buffer += get_connection_buffer (iter);
3099 * Get the tunnel's destination.
3103 * @return ID of the destination peer.
3105 const struct GNUNET_PeerIdentity *
3106 GCT_get_destination (struct CadetTunnel *t)
3108 return GCP_get_id (t->peer);
3113 * Get the tunnel's next free global channel ID.
3117 * @return GID of a channel free to use.
3120 GCT_get_next_chid (struct CadetTunnel *t)
3122 CADET_ChannelNumber chid;
3123 CADET_ChannelNumber mask;
3126 /* Set bit 30 depending on the ID relationship. Bit 31 is always 0 for GID.
3127 * If our ID is bigger or loopback tunnel, start at 0, bit 30 = 0
3128 * If peer's ID is bigger, start at 0x4... bit 30 = 1
3130 result = GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, GCP_get_id (t->peer));
3135 t->next_chid |= mask;
3137 while (NULL != GCT_get_channel (t, t->next_chid))
3139 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
3140 t->next_chid = (t->next_chid + 1) & ~GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
3141 t->next_chid |= mask;
3143 chid = t->next_chid;
3144 t->next_chid = (t->next_chid + 1) & ~GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
3145 t->next_chid |= mask;
3152 * Send ACK on one or more channels due to buffer in connections.
3154 * @param t Channel which has some free buffer space.
3157 GCT_unchoke_channels (struct CadetTunnel *t)
3159 struct CadetTChannel *iter;
3160 unsigned int buffer;
3161 unsigned int channels = GCT_count_channels (t);
3162 unsigned int choked_n;
3163 struct CadetChannel *choked[channels];
3165 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_unchoke_channels on %s\n", GCT_2s (t));
3166 LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
3167 if (NULL != t->channel_head)
3168 LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
3170 if (NULL != t->tq_head)
3171 send_queued_data (t);
3173 /* Get buffer space */
3174 buffer = GCT_get_connections_buffer (t);
3180 /* Count and remember choked channels */
3182 for (iter = t->channel_head; NULL != iter; iter = iter->next)
3184 if (GNUNET_NO == get_channel_allowed (iter))
3186 choked[choked_n++] = iter->ch;
3190 /* Unchoke random channels */
3191 while (0 < buffer && 0 < choked_n)
3193 unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3195 GCCH_allow_client (choked[r], GCCH_is_origin (choked[r], GNUNET_YES));
3198 choked[r] = choked[choked_n];
3204 * Send ACK on one or more connections due to buffer space to the client.
3206 * Iterates all connections of the tunnel and sends ACKs appropriately.
3211 GCT_send_connection_acks (struct CadetTunnel *t)
3213 struct CadetTConnection *iter;
3216 uint32_t allow_per_connection;
3218 unsigned int buffer;
3220 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel send connection ACKs on %s\n",
3229 if (CADET_TUNNEL_READY != t->cstate)
3232 buffer = GCT_get_channels_buffer (t);
3233 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer %u\n", buffer);
3235 /* Count connections, how many messages are already allowed */
3236 cs = GCT_count_connections (t);
3237 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
3239 allowed += get_connection_allowed (iter);
3241 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowed %u\n", allowed);
3243 /* Make sure there is no overflow */
3244 if (allowed > buffer)
3247 /* Authorize connections to send more data */
3248 to_allow = buffer - allowed;
3250 for (iter = t->connection_head;
3251 NULL != iter && to_allow > 0;
3254 if (CADET_CONNECTION_READY != GCC_get_state (iter->c)
3255 || get_connection_allowed (iter) > 64 / 3)
3259 GNUNET_assert(cs != 0);
3260 allow_per_connection = to_allow/cs;
3261 to_allow -= allow_per_connection;
3263 GCC_allow (iter->c, allow_per_connection,
3264 GCC_is_origin (iter->c, GNUNET_NO));
3269 /* Since we don't allow if it's allowed to send 64/3, this can happen. */
3270 LOG (GNUNET_ERROR_TYPE_DEBUG, " reminding to_allow: %u\n", to_allow);
3276 * Cancel a previously sent message while it's in the queue.
3278 * ONLY can be called before the continuation given to the send function
3279 * is called. Once the continuation is called, the message is no longer in the
3282 * @param q Handle to the queue.
3285 GCT_cancel (struct CadetTunnelQueue *q)
3289 GNUNET_assert (NULL == q->tqd);
3291 /* tun_message_sent() will be called and free q */
3293 else if (NULL != q->tqd)
3295 unqueue_data (q->tqd);
3297 if (NULL != q->cont)
3298 q->cont (q->cont_cls, NULL, q, 0, 0);
3309 * Check if the tunnel has queued traffic.
3311 * @param t Tunnel to check.
3313 * @return #GNUNET_YES if there is queued traffic
3314 * #GNUNET_NO otherwise
3317 GCT_has_queued_traffic (struct CadetTunnel *t)
3319 return (NULL != t->tq_head) ? GNUNET_YES : GNUNET_NO;
3324 * Sends an already built message on a tunnel, encrypting it and
3325 * choosing the best connection if not provided.
3327 * @param message Message to send. Function modifies it.
3328 * @param t Tunnel on which this message is transmitted.
3329 * @param c Connection to use (autoselect if NULL).
3330 * @param force Force the tunnel to take the message (buffer overfill).
3331 * @param cont Continuation to call once message is really sent.
3332 * @param cont_cls Closure for @c cont.
3334 * @return Handle to cancel message. NULL if @c cont is NULL.
3336 struct CadetTunnelQueue *
3337 GCT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
3338 struct CadetTunnel *t, struct CadetConnection *c,
3339 int force, GCT_sent cont, void *cont_cls)
3341 return send_prebuilt_message (message, t, c, force, cont, cont_cls, NULL);
3346 * Send an Axolotl KX message.
3348 * @param t Tunnel on which to send it.
3349 * @param force_reply Force the other peer to reply with a KX message.
3352 GCT_send_ax_kx (struct CadetTunnel *t, int force_reply)
3354 struct GNUNET_CADET_AX_KX msg;
3355 enum GNUNET_CADET_AX_KX_Flags flags;
3357 LOG (GNUNET_ERROR_TYPE_INFO, "==> { AX_KX} on %s\n", GCT_2s (t));
3358 if (NULL != t->ephm_h)
3360 LOG (GNUNET_ERROR_TYPE_INFO, " already queued\n");
3364 msg.header.size = htons (sizeof (msg));
3365 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_AX_KX);
3366 flags = GNUNET_CADET_AX_KX_FLAG_NONE;
3368 flags |= GNUNET_CADET_AX_KX_FLAG_FORCE_REPLY;
3369 msg.flags = htonl (flags);
3370 GNUNET_CRYPTO_ecdhe_key_get_public (t->ax->kx_0, &msg.ephemeral_key);
3371 GNUNET_CRYPTO_ecdhe_key_get_public (t->ax->DHRs, &msg.ratchet_key);
3373 t->ephm_h = send_kx (t, &msg.header);
3374 if (CADET_TUNNEL_KEY_UNINITIALIZED == t->estate)
3375 GCT_change_estate (t, CADET_TUNNEL_KEY_SENT);
3380 * Is the tunnel directed towards the local peer?
3384 * @return #GNUNET_YES if it is loopback.
3387 GCT_is_loopback (const struct CadetTunnel *t)
3389 return (myid == GCP_get_short_id (t->peer));
3394 * Is the tunnel this path already?
3399 * @return #GNUNET_YES a connection uses this path.
3402 GCT_is_path_used (const struct CadetTunnel *t, const struct CadetPeerPath *p)
3404 struct CadetTConnection *iter;
3406 for (iter = t->connection_head; NULL != iter; iter = iter->next)
3407 if (path_equivalent (GCC_get_path (iter->c), p))
3415 * Get a cost of a path for a tunnel considering existing connections.
3418 * @param path Candidate path.
3420 * @return Cost of the path (path length + number of overlapping nodes)
3423 GCT_get_path_cost (const struct CadetTunnel *t,
3424 const struct CadetPeerPath *path)
3426 struct CadetTConnection *iter;
3427 const struct CadetPeerPath *aux;
3428 unsigned int overlap;
3436 GNUNET_assert (NULL != t);
3438 for (i = 0; i < path->length; i++)
3440 for (iter = t->connection_head; NULL != iter; iter = iter->next)
3442 aux = GCC_get_path (iter->c);
3446 for (j = 0; j < aux->length; j++)
3448 if (path->peers[i] == aux->peers[j])
3456 return path->length + overlap;
3461 * Get the static string for the peer this tunnel is directed.
3465 * @return Static string the destination peer's ID.
3468 GCT_2s (const struct CadetTunnel *t)
3473 return GCP_2s (t->peer);
3477 /******************************************************************************/
3478 /***************************** INFO/DEBUG *******************************/
3479 /******************************************************************************/
3482 ax_debug (const struct CadetTunnelAxolotl *ax, enum GNUNET_ErrorType level)
3484 struct GNUNET_CRYPTO_EcdhePublicKey pub;
3485 struct CadetTunnelSkippedKey *iter;
3487 LOG2 (level, "TTT RK \t %s\n",
3488 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->RK));
3490 LOG2 (level, "TTT HKs \t %s\n",
3491 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->HKs));
3492 LOG2 (level, "TTT HKr \t %s\n",
3493 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->HKr));
3494 LOG2 (level, "TTT NHKs\t %s\n",
3495 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->NHKs));
3496 LOG2 (level, "TTT NHKr\t %s\n",
3497 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->NHKr));
3499 LOG2 (level, "TTT CKs \t %s\n",
3500 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->CKs));
3501 LOG2 (level, "TTT CKr \t %s\n",
3502 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->CKr));
3504 GNUNET_CRYPTO_ecdhe_key_get_public (ax->DHRs, &pub);
3505 LOG2 (level, "TTT DHRs\t %s\n",
3506 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &pub));
3507 LOG2 (level, "TTT DHRr\t %s\n",
3508 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->DHRr));
3510 LOG2 (level, "TTT Nr\t %u\tNs\t%u\n", ax->Nr, ax->Ns);
3511 LOG2 (level, "TTT PNs\t %u\tSkipped\t%u\n", ax->PNs, ax->skipped);
3512 LOG2 (level, "TTT Ratchet\t%u\n", ax->ratchet_flag);
3514 for (iter = ax->skipped_head; NULL != iter; iter = iter->next)
3516 LOG2 (level, "TTT HK\t %s\n",
3517 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &iter->HK));
3518 LOG2 (level, "TTT MK\t %s\n",
3519 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &iter->MK));
3524 * Log all possible info about the tunnel state.
3526 * @param t Tunnel to debug.
3527 * @param level Debug level to use.
3530 GCT_debug (const struct CadetTunnel *t, enum GNUNET_ErrorType level)
3532 struct CadetTChannel *iterch;
3533 struct CadetTConnection *iterc;
3536 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
3538 __FILE__, __FUNCTION__, __LINE__);
3542 LOG2 (level, "TTT DEBUG TUNNEL TOWARDS %s\n", GCT_2s (t));
3543 LOG2 (level, "TTT cstate %s, estate %s\n",
3544 cstate2s (t->cstate), estate2s (t->estate));
3545 #if DUMP_KEYS_TO_STDERR
3546 if (CADET_Axolotl == t->enc_type)
3548 ax_debug (t->ax, level);
3552 LOG2 (level, "TTT peers EPHM:\t %s\n",
3553 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &t->peers_ephemeral_key));
3554 LOG2 (level, "TTT ENC key:\t %s\n",
3555 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &t->e_key));
3556 LOG2 (level, "TTT DEC key:\t %s\n",
3557 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &t->d_key));
3560 LOG2 (level, "TTT tq_head %p, tq_tail %p\n", t->tq_head, t->tq_tail);
3561 LOG2 (level, "TTT destroy %p\n", t->destroy_task);
3563 LOG2 (level, "TTT channels:\n");
3564 for (iterch = t->channel_head; NULL != iterch; iterch = iterch->next)
3566 GCCH_debug (iterch->ch, level);
3569 LOG2 (level, "TTT connections:\n");
3570 for (iterc = t->connection_head; NULL != iterc; iterc = iterc->next)
3572 GCC_debug (iterc->c, level);
3575 LOG2 (level, "TTT DEBUG TUNNEL END\n");
3580 * Iterate all tunnels.
3582 * @param iter Iterator.
3583 * @param cls Closure for @c iter.
3586 GCT_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter, void *cls)
3588 GNUNET_CONTAINER_multipeermap_iterate (tunnels, iter, cls);
3593 * Count all tunnels.
3595 * @return Number of tunnels to remote peers kept by this peer.
3598 GCT_count_all (void)
3600 return GNUNET_CONTAINER_multipeermap_size (tunnels);
3605 * Iterate all connections of a tunnel.
3607 * @param t Tunnel whose connections to iterate.
3608 * @param iter Iterator.
3609 * @param cls Closure for @c iter.
3612 GCT_iterate_connections (struct CadetTunnel *t, GCT_conn_iter iter, void *cls)
3614 struct CadetTConnection *ct;
3616 for (ct = t->connection_head; NULL != ct; ct = ct->next)
3622 * Iterate all channels of a tunnel.
3624 * @param t Tunnel whose channels to iterate.
3625 * @param iter Iterator.
3626 * @param cls Closure for @c iter.
3629 GCT_iterate_channels (struct CadetTunnel *t, GCT_chan_iter iter, void *cls)
3631 struct CadetTChannel *cht;
3633 for (cht = t->channel_head; NULL != cht; cht = cht->next)
3634 iter (cls, cht->ch);