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diff --git a/src/cadet/gnunet-service-cadet_tunnel.c b/src/cadet/gnunet-service-cadet_tunnel.c
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1/*
2 This file is part of GNUnet.
3 (C) 2013 Christian Grothoff (and other contributing authors)
4
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.
9
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.
14
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.
19*/
20
21#include "platform.h"
22#include "gnunet_util_lib.h"
23
24#include "gnunet_signatures.h"
25#include "gnunet_statistics_service.h"
26
27#include "cadet_protocol.h"
28#include "cadet_path.h"
29
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"
34
35#define LOG(level, ...) GNUNET_log_from(level,"cadet-tun",__VA_ARGS__)
36
37#define REKEY_WAIT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 5)
38
39#define CONNECTIONS_PER_TUNNEL 3
40
41/******************************************************************************/
42/******************************** STRUCTS **********************************/
43/******************************************************************************/
44
45struct CadetTChannel
46{
47 struct CadetTChannel *next;
48 struct CadetTChannel *prev;
49 struct CadetChannel *ch;
50};
51
52
53/**
54 * Connection list and metadata.
55 */
56struct CadetTConnection
57{
58 /**
59 * Next in DLL.
60 */
61 struct CadetTConnection *next;
62
63 /**
64 * Prev in DLL.
65 */
66 struct CadetTConnection *prev;
67
68 /**
69 * Connection handle.
70 */
71 struct CadetConnection *c;
72
73 /**
74 * Creation time, to keep oldest connection alive.
75 */
76 struct GNUNET_TIME_Absolute created;
77
78 /**
79 * Connection throughput, to keep fastest connection alive.
80 */
81 uint32_t throughput;
82};
83
84/**
85 * Structure used during a Key eXchange.
86 */
87struct CadetTunnelKXCtx
88{
89 /**
90 * Decryption ("their") old key, for decrypting traffic sent by the
91 * other end before the key exchange started.
92 */
93 struct GNUNET_CRYPTO_SymmetricSessionKey d_key_old;
94
95 /**
96 * Challenge to send in a ping and expect in the pong.
97 */
98 uint32_t challenge;
99};
100
101/**
102 * Struct containing all information regarding a tunnel to a peer.
103 */
104struct CadetTunnel3
105{
106 /**
107 * Endpoint of the tunnel.
108 */
109 struct CadetPeer *peer;
110
111 /**
112 * State of the tunnel connectivity.
113 */
114 enum CadetTunnel3CState cstate;
115
116 /**
117 * State of the tunnel encryption.
118 */
119 enum CadetTunnel3EState estate;
120
121 /**
122 * Key eXchange context.
123 */
124 struct CadetTunnelKXCtx *kx_ctx;
125
126 /**
127 * Encryption ("our") key.
128 */
129 struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
130
131 /**
132 * Decryption ("their") key.
133 */
134 struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
135
136 /**
137 * Task to start the rekey process.
138 */
139 GNUNET_SCHEDULER_TaskIdentifier rekey_task;
140
141 /**
142 * Paths that are actively used to reach the destination peer.
143 */
144 struct CadetTConnection *connection_head;
145 struct CadetTConnection *connection_tail;
146
147 /**
148 * Next connection number.
149 */
150 uint32_t next_cid;
151
152 /**
153 * Channels inside this tunnel.
154 */
155 struct CadetTChannel *channel_head;
156 struct CadetTChannel *channel_tail;
157
158 /**
159 * Channel ID for the next created channel.
160 */
161 CADET_ChannelNumber next_chid;
162
163 /**
164 * Destroy flag: if true, destroy on last message.
165 */
166 GNUNET_SCHEDULER_TaskIdentifier destroy_task;
167
168 /**
169 * Queued messages, to transmit once tunnel gets connected.
170 */
171 struct CadetTunnelDelayed *tq_head;
172 struct CadetTunnelDelayed *tq_tail;
173};
174
175
176/**
177 * Struct used to save messages in a non-ready tunnel to send once connected.
178 */
179struct CadetTunnelDelayed
180{
181 /**
182 * DLL
183 */
184 struct CadetTunnelDelayed *next;
185 struct CadetTunnelDelayed *prev;
186
187 /**
188 * Tunnel.
189 */
190 struct CadetTunnel3 *t;
191
192 /**
193 * Tunnel queue given to the channel to cancel request. Update on send_queued.
194 */
195 struct CadetTunnel3Queue *tq;
196
197 /**
198 * Message to send.
199 */
200 /* struct GNUNET_MessageHeader *msg; */
201};
202
203
204/**
205 * Handle for messages queued but not yet sent.
206 */
207struct CadetTunnel3Queue
208{
209 /**
210 * Connection queue handle, to cancel if necessary.
211 */
212 struct CadetConnectionQueue *cq;
213
214 /**
215 * Handle in case message hasn't been given to a connection yet.
216 */
217 struct CadetTunnelDelayed *tqd;
218
219 /**
220 * Continuation to call once sent.
221 */
222 GMT_sent cont;
223
224 /**
225 * Closure for @c cont.
226 */
227 void *cont_cls;
228};
229
230
231/******************************************************************************/
232/******************************* GLOBALS ***********************************/
233/******************************************************************************/
234
235/**
236 * Global handle to the statistics service.
237 */
238extern struct GNUNET_STATISTICS_Handle *stats;
239
240/**
241 * Local peer own ID (memory efficient handle).
242 */
243extern GNUNET_PEER_Id myid;
244
245/**
246 * Local peer own ID (full value).
247 */
248extern struct GNUNET_PeerIdentity my_full_id;
249
250
251/**
252 * Don't try to recover tunnels if shutting down.
253 */
254extern int shutting_down;
255
256
257/**
258 * Set of all tunnels, in order to trigger a new exchange on rekey.
259 * Indexed by peer's ID.
260 */
261static struct GNUNET_CONTAINER_MultiPeerMap *tunnels;
262
263/**
264 * Default TTL for payload packets.
265 */
266static unsigned long long default_ttl;
267
268/**
269 * Own private key.
270 */
271const static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
272
273/**
274 * Own ephemeral private key.
275 */
276static struct GNUNET_CRYPTO_EcdhePrivateKey *my_ephemeral_key;
277
278/**
279 * Cached message used to perform a key exchange.
280 */
281static struct GNUNET_CADET_KX_Ephemeral kx_msg;
282
283/**
284 * Task to generate a new ephemeral key.
285 */
286static GNUNET_SCHEDULER_TaskIdentifier rekey_task;
287
288/**
289 * Rekey period.
290 */
291static struct GNUNET_TIME_Relative rekey_period;
292
293/******************************************************************************/
294/******************************** STATIC ***********************************/
295/******************************************************************************/
296
297/**
298 * Get string description for tunnel connectivity state.
299 *
300 * @param cs Tunnel state.
301 *
302 * @return String representation.
303 */
304static const char *
305cstate2s (enum CadetTunnel3CState cs)
306{
307 static char buf[128];
308
309 switch (cs)
310 {
311 case CADET_TUNNEL3_NEW:
312 return "CADET_TUNNEL3_NEW";
313 case CADET_TUNNEL3_SEARCHING:
314 return "CADET_TUNNEL3_SEARCHING";
315 case CADET_TUNNEL3_WAITING:
316 return "CADET_TUNNEL3_WAITING";
317 case CADET_TUNNEL3_READY:
318 return "CADET_TUNNEL3_READY";
319
320 default:
321 sprintf (buf, "%u (UNKNOWN STATE)", cs);
322 return buf;
323 }
324 return "";
325}
326
327
328/**
329 * Get string description for tunnel encryption state.
330 *
331 * @param es Tunnel state.
332 *
333 * @return String representation.
334 */
335static const char *
336estate2s (enum CadetTunnel3EState es)
337{
338 static char buf[128];
339
340 switch (es)
341 {
342 case CADET_TUNNEL3_KEY_UNINITIALIZED:
343 return "CADET_TUNNEL3_KEY_UNINITIALIZED";
344 case CADET_TUNNEL3_KEY_SENT:
345 return "CADET_TUNNEL3_KEY_SENT";
346 case CADET_TUNNEL3_KEY_PING:
347 return "CADET_TUNNEL3_KEY_PING";
348 case CADET_TUNNEL3_KEY_OK:
349 return "CADET_TUNNEL3_KEY_OK";
350
351 default:
352 sprintf (buf, "%u (UNKNOWN STATE)", es);
353 return buf;
354 }
355 return "";
356}
357
358
359/**
360 * @brief Check if tunnel is ready to send traffic.
361 *
362 * Tunnel must be connected and with encryption correctly set up.
363 *
364 * @param t Tunnel to check.
365 *
366 * @return #GNUNET_YES if ready, #GNUNET_NO otherwise
367 */
368static int
369is_ready (struct CadetTunnel3 *t)
370{
371 int ready;
372
373 GMT_debug (t);
374 ready = (CADET_TUNNEL3_READY == t->cstate && CADET_TUNNEL3_KEY_OK == t->estate);
375 ready = ready || GMT_is_loopback (t);
376 return ready;
377}
378
379
380/**
381 * Ephemeral key message purpose size.
382 *
383 * @return Size of the part of the ephemeral key message that must be signed.
384 */
385size_t
386ephemeral_purpose_size (void)
387{
388 return sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
389 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
390 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
391 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
392 sizeof (struct GNUNET_PeerIdentity);
393}
394
395
396/**
397 * Size of the encrypted part of a ping message.
398 *
399 * @return Size of the encrypted part of a ping message.
400 */
401size_t
402ping_encryption_size (void)
403{
404 return sizeof (struct GNUNET_PeerIdentity) + sizeof (uint32_t);
405}
406
407
408/**
409 * Get the channel's buffer. ONLY FOR NON-LOOPBACK CHANNELS!!
410 *
411 * @param tch Tunnel's channel handle.
412 *
413 * @return Amount of messages the channel can still buffer towards the client.
414 */
415static unsigned int
416get_channel_buffer (const struct CadetTChannel *tch)
417{
418 int fwd;
419
420 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
421 fwd = GMCH_is_origin (tch->ch, GNUNET_YES);
422
423 return GMCH_get_buffer (tch->ch, fwd);
424}
425
426
427/**
428 * Get the channel's allowance status.
429 *
430 * @param tch Tunnel's channel handle.
431 *
432 * @return #GNUNET_YES if we allowed the client to send data to us.
433 */
434static int
435get_channel_allowed (const struct CadetTChannel *tch)
436{
437 int fwd;
438
439 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
440 fwd = GMCH_is_origin (tch->ch, GNUNET_YES);
441
442 return GMCH_get_allowed (tch->ch, fwd);
443}
444
445
446/**
447 * Get the connection's buffer.
448 *
449 * @param tc Tunnel's connection handle.
450 *
451 * @return Amount of messages the connection can still buffer.
452 */
453static unsigned int
454get_connection_buffer (const struct CadetTConnection *tc)
455{
456 int fwd;
457
458 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
459 fwd = GMC_is_origin (tc->c, GNUNET_YES);
460
461 return GMC_get_buffer (tc->c, fwd);
462}
463
464
465/**
466 * Get the connection's allowance.
467 *
468 * @param tc Tunnel's connection handle.
469 *
470 * @return Amount of messages we have allowed the next peer to send us.
471 */
472static unsigned int
473get_connection_allowed (const struct CadetTConnection *tc)
474{
475 int fwd;
476
477 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
478 fwd = GMC_is_origin (tc->c, GNUNET_YES);
479
480 return GMC_get_allowed (tc->c, fwd);
481}
482
483
484/**
485 * Check that a ephemeral key message s well formed and correctly signed.
486 *
487 * @param t Tunnel on which the message came.
488 * @param msg The ephemeral key message.
489 *
490 * @return GNUNET_OK if message is fine, GNUNET_SYSERR otherwise.
491 */
492int
493check_ephemeral (struct CadetTunnel3 *t,
494 const struct GNUNET_CADET_KX_Ephemeral *msg)
495{
496 /* Check message size */
497 if (ntohs (msg->header.size) != sizeof (struct GNUNET_CADET_KX_Ephemeral))
498 return GNUNET_SYSERR;
499
500 /* Check signature size */
501 if (ntohl (msg->purpose.size) != ephemeral_purpose_size ())
502 return GNUNET_SYSERR;
503
504 /* Check origin */
505 if (0 != memcmp (&msg->origin_identity,
506 GMP_get_id (t->peer),
507 sizeof (struct GNUNET_PeerIdentity)))
508 return GNUNET_SYSERR;
509
510 /* Check signature */
511 if (GNUNET_OK !=
512 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_CADET_KX,
513 &msg->purpose,
514 &msg->signature,
515 &msg->origin_identity.public_key))
516 return GNUNET_SYSERR;
517
518 return GNUNET_OK;
519}
520
521
522/**
523 * Encrypt data with the tunnel key.
524 *
525 * @param t Tunnel whose key to use.
526 * @param dst Destination for the encrypted data.
527 * @param src Source of the plaintext. Can overlap with @c dst.
528 * @param size Size of the plaintext.
529 * @param iv Initialization Vector to use.
530 */
531static int
532t_encrypt (struct CadetTunnel3 *t,
533 void *dst, const void *src,
534 size_t size, uint32_t iv)
535{
536 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
537 size_t out_size;
538
539 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt start\n");
540 GNUNET_CRYPTO_symmetric_derive_iv (&siv, &t->e_key, &iv, sizeof (iv), NULL);
541 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt IV derived\n");
542 out_size = GNUNET_CRYPTO_symmetric_encrypt (src, size, &t->e_key, &siv, dst);
543 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt end\n");
544
545 return out_size;
546}
547
548
549/**
550 * Decrypt data with the tunnel key.
551 *
552 * @param t Tunnel whose key to use.
553 * @param dst Destination for the plaintext.
554 * @param src Source of the encrypted data. Can overlap with @c dst.
555 * @param size Size of the encrypted data.
556 * @param iv Initialization Vector to use.
557 */
558static int
559t_decrypt (struct CadetTunnel3 *t,
560 void *dst, const void *src,
561 size_t size, uint32_t iv)
562{
563 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
564 struct GNUNET_CRYPTO_SymmetricSessionKey *key;
565 size_t out_size;
566
567 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt start\n");
568 if (t->estate == CADET_TUNNEL3_KEY_OK || t->estate == CADET_TUNNEL3_KEY_PING)
569 {
570 key = &t->d_key;
571 }
572 else if (NULL != t->kx_ctx)
573 {
574 key = &t->kx_ctx->d_key_old;
575 }
576 else
577 {
578 GNUNET_STATISTICS_update (stats, "# non decryptable data", 1, GNUNET_NO);
579 LOG (GNUNET_ERROR_TYPE_DEBUG,
580 "WARNING got data on %s without a valid key\n",
581 GMT_2s (t));
582 GMT_debug (t);
583 return 0;
584 }
585
586 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt iv\n");
587 GNUNET_CRYPTO_symmetric_derive_iv (&siv, key, &iv, sizeof (iv), NULL);
588 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt iv done\n");
589 out_size = GNUNET_CRYPTO_symmetric_decrypt (src, size, key, &siv, dst);
590 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt end\n");
591
592 return out_size;
593}
594
595
596/**
597 * Create key material by doing ECDH on the local and remote ephemeral keys.
598 *
599 * @param key_material Where to store the key material.
600 * @param ephemeral_key Peer's public ephemeral key.
601 */
602void
603derive_key_material (struct GNUNET_HashCode *key_material,
604 const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key)
605{
606 if (GNUNET_OK !=
607 GNUNET_CRYPTO_ecc_ecdh (my_ephemeral_key,
608 ephemeral_key,
609 key_material))
610 {
611 GNUNET_break (0);
612 }
613}
614
615/**
616 * Create a symmetic key from the identities of both ends and the key material
617 * from ECDH.
618 *
619 * @param key Destination for the generated key.
620 * @param sender ID of the peer that will encrypt with @c key.
621 * @param receiver ID of the peer that will decrypt with @c key.
622 * @param key_material Hash created with ECDH with the ephemeral keys.
623 */
624void
625derive_symmertic (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
626 const struct GNUNET_PeerIdentity *sender,
627 const struct GNUNET_PeerIdentity *receiver,
628 const struct GNUNET_HashCode *key_material)
629{
630 const char salt[] = "CADET kx salt";
631
632 GNUNET_CRYPTO_kdf (key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
633 salt, sizeof (salt),
634 key_material, sizeof (struct GNUNET_HashCode),
635 sender, sizeof (struct GNUNET_PeerIdentity),
636 receiver, sizeof (struct GNUNET_PeerIdentity),
637 NULL);
638}
639
640/**
641 * Pick a connection on which send the next data message.
642 *
643 * @param t Tunnel on which to send the message.
644 *
645 * @return The connection on which to send the next message.
646 */
647static struct CadetConnection *
648tunnel_get_connection (struct CadetTunnel3 *t)
649{
650 struct CadetTConnection *iter;
651 struct CadetConnection *best;
652 unsigned int qn;
653 unsigned int lowest_q;
654
655 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GMT_2s (t));
656 best = NULL;
657 lowest_q = UINT_MAX;
658 for (iter = t->connection_head; NULL != iter; iter = iter->next)
659 {
660 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
661 GMC_2s (iter->c), GMC_get_state (iter->c));
662 if (CADET_CONNECTION_READY == GMC_get_state (iter->c))
663 {
664 qn = GMC_get_qn (iter->c, GMC_is_origin (iter->c, GNUNET_YES));
665 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
666 if (qn < lowest_q)
667 {
668 best = iter->c;
669 lowest_q = qn;
670 }
671 }
672 }
673 LOG (GNUNET_ERROR_TYPE_DEBUG, " selected: connection %s\n", GMC_2s (best));
674 return best;
675}
676
677
678/**
679 * Callback called when a queued message is sent.
680 *
681 * Calculates the average time and connection packet tracking.
682 *
683 * @param cls Closure (TunnelQueue handle).
684 * @param c Connection this message was on.
685 * @param q Connection queue handle (unused).
686 * @param type Type of message sent.
687 * @param fwd Was this a FWD going message?
688 * @param size Size of the message.
689 */
690static void
691tun_message_sent (void *cls,
692 struct CadetConnection *c,
693 struct CadetConnectionQueue *q,
694 uint16_t type, int fwd, size_t size)
695{
696 struct CadetTunnel3Queue *qt = cls;
697 struct CadetTunnel3 *t;
698
699 LOG (GNUNET_ERROR_TYPE_DEBUG, "tun_message_sent\n");
700
701 GNUNET_assert (NULL != qt->cont);
702 t = NULL == c ? NULL : GMC_get_tunnel (c);
703 qt->cont (qt->cont_cls, t, qt, type, size);
704 GNUNET_free (qt);
705}
706
707
708/**
709 * Delete a queued message: either was sent or the channel was destroyed
710 * before the tunnel's key exchange had a chance to finish.
711 *
712 * @param tqd Delayed queue handle.
713 */
714static void
715unqueue_data (struct CadetTunnelDelayed *tqd)
716{
717 GNUNET_CONTAINER_DLL_remove (tqd->t->tq_head, tqd->t->tq_tail, tqd);
718 GNUNET_free (tqd);
719}
720
721
722/**
723 * Cache a message to be sent once tunnel is online.
724 *
725 * @param t Tunnel to hold the message.
726 * @param msg Message itself (copy will be made).
727 */
728static struct CadetTunnelDelayed *
729queue_data (struct CadetTunnel3 *t, const struct GNUNET_MessageHeader *msg)
730{
731 struct CadetTunnelDelayed *tqd;
732 uint16_t size = ntohs (msg->size);
733
734 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue data on Tunnel %s\n", GMT_2s (t));
735
736 if (GNUNET_YES == is_ready (t))
737 {
738 GNUNET_break (0);
739 return NULL;
740 }
741
742 tqd = GNUNET_malloc (sizeof (struct CadetTunnelDelayed) + size);
743
744 tqd->t = t;
745 memcpy (&tqd[1], msg, size);
746 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tqd);
747 return tqd;
748}
749
750
751/**
752 * Calculate HMAC.
753 *
754 * @param t Tunnel to get keys from.
755 * @param plaintext Content to HMAC.
756 * @param size Size of @c plaintext.
757 * @param iv Initialization vector for the message.
758 * @param outgoing Is this an outgoing message that we encrypted?
759 * @param hmac Destination to store the HMAC.
760 */
761static void
762t_hmac (struct CadetTunnel3 *t, const void *plaintext, size_t size, uint32_t iv,
763 int outgoing, struct GNUNET_CADET_Hash *hmac)
764{
765 struct GNUNET_CRYPTO_AuthKey auth_key;
766 static const char ctx[] = "cadet authentication key";
767 struct GNUNET_CRYPTO_SymmetricSessionKey *key;
768 struct GNUNET_HashCode hash;
769
770 key = outgoing ? &t->e_key : &t->d_key;
771 GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
772 &iv, sizeof (iv),
773 key, sizeof (*key),
774 ctx, sizeof (ctx),
775 NULL);
776 GNUNET_CRYPTO_hmac (&auth_key, plaintext, size, &hash);
777 memcpy (hmac, &hash, sizeof (*hmac));
778}
779
780
781/**
782 * Sends an already built message on a tunnel, encrypting it and
783 * choosing the best connection.
784 *
785 * @param message Message to send. Function modifies it.
786 * @param t Tunnel on which this message is transmitted.
787 * @param c Connection to use (autoselect if NULL).
788 * @param force Force the tunnel to take the message (buffer overfill).
789 * @param cont Continuation to call once message is really sent.
790 * @param cont_cls Closure for @c cont.
791 * @param existing_q In case this a transmission of previously queued data,
792 * this should be TunnelQueue given to the client.
793 * Otherwise, NULL.
794 *
795 * @return Handle to cancel message. NULL if @c cont is NULL.
796 */
797static struct CadetTunnel3Queue *
798send_prebuilt_message (const struct GNUNET_MessageHeader *message,
799 struct CadetTunnel3 *t, struct CadetConnection *c,
800 int force, GMT_sent cont, void *cont_cls,
801 struct CadetTunnel3Queue *existing_q)
802{
803 struct CadetTunnel3Queue *tq;
804 struct GNUNET_CADET_Encrypted *msg;
805 size_t size = ntohs (message->size);
806 char cbuf[sizeof (struct GNUNET_CADET_Encrypted) + size];
807 uint32_t mid;
808 uint32_t iv;
809 uint16_t type;
810 int fwd;
811
812 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GMT_2s (t));
813
814 if (GNUNET_NO == is_ready (t))
815 {
816 struct CadetTunnelDelayed *tqd;
817 /* A non null existing_q indicates sending of queued data.
818 * Should only happen after tunnel becomes ready.
819 */
820 GNUNET_assert (NULL == existing_q);
821 tqd = queue_data (t, message);
822 if (NULL == cont)
823 return NULL;
824 tq = GNUNET_new (struct CadetTunnel3Queue);
825 tq->tqd = tqd;
826 tqd->tq = tq;
827 tq->cont = cont;
828 tq->cont_cls = cont_cls;
829 return tq;
830 }
831
832 GNUNET_assert (GNUNET_NO == GMT_is_loopback (t));
833
834 iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
835 msg = (struct GNUNET_CADET_Encrypted *) cbuf;
836 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED);
837 msg->iv = iv;
838 GNUNET_assert (t_encrypt (t, &msg[1], message, size, iv) == size);
839 t_hmac (t, &msg[1], size, iv, GNUNET_YES, &msg->hmac);
840 msg->header.size = htons (sizeof (struct GNUNET_CADET_Encrypted) + size);
841
842 if (NULL == c)
843 c = tunnel_get_connection (t);
844 if (NULL == c)
845 {
846 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task
847 || CADET_TUNNEL3_SEARCHING != t->cstate)
848 {
849 GNUNET_break (0);
850 GMT_debug (t);
851 }
852 return NULL;
853 }
854
855 mid = 0;
856 type = ntohs (message->type);
857 switch (type)
858 {
859 case GNUNET_MESSAGE_TYPE_CADET_DATA:
860 case GNUNET_MESSAGE_TYPE_CADET_DATA_ACK:
861 if (GNUNET_MESSAGE_TYPE_CADET_DATA == type)
862 mid = ntohl (((struct GNUNET_CADET_Data *) message)->mid);
863 else
864 mid = ntohl (((struct GNUNET_CADET_DataACK *) message)->mid);
865 /* Fall thru */
866 case GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE:
867 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
868 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
869 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_ACK:
870 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_NACK:
871 msg->cid = *GMC_get_id (c);
872 msg->ttl = htonl (default_ttl);
873 break;
874 default:
875 GNUNET_break (0);
876 }
877 LOG (GNUNET_ERROR_TYPE_DEBUG, "type %s\n", GM_m2s (type));
878
879 fwd = GMC_is_origin (c, GNUNET_YES);
880
881 if (NULL == cont)
882 {
883 GNUNET_break (NULL ==
884 GMC_send_prebuilt_message (&msg->header, type, mid,
885 c, fwd, force, NULL, NULL));
886 return NULL;
887 }
888 if (NULL == existing_q)
889 {
890 tq = GNUNET_new (struct CadetTunnel3Queue); /* FIXME valgrind: leak*/
891 }
892 else
893 {
894 tq = existing_q;
895 tq->tqd = NULL;
896 }
897 tq->cq = GMC_send_prebuilt_message (&msg->header, type, mid, c, fwd, force,
898 &tun_message_sent, tq);
899 tq->cont = cont;
900 tq->cont_cls = cont_cls;
901
902 return tq;
903}
904
905
906/**
907 * Send all cached messages that we can, tunnel is online.
908 *
909 * @param t Tunnel that holds the messages. Cannot be loopback.
910 */
911static void
912send_queued_data (struct CadetTunnel3 *t)
913{
914 struct CadetTunnelDelayed *tqd;
915 struct CadetTunnelDelayed *next;
916 unsigned int room;
917
918 LOG (GNUNET_ERROR_TYPE_DEBUG,
919 "GMT_send_queued_data on tunnel %s\n",
920 GMT_2s (t));
921
922 if (GMT_is_loopback (t))
923 {
924 GNUNET_break (0);
925 return;
926 }
927
928 if (GNUNET_NO == is_ready (t))
929 {
930 LOG (GNUNET_ERROR_TYPE_DEBUG, " not ready yet: %s/%s\n",
931 estate2s (t->estate), cstate2s (t->cstate));
932 return;
933 }
934
935 room = GMT_get_connections_buffer (t);
936 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
937 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq head: %p\n", t->tq_head);
938 for (tqd = t->tq_head; NULL != tqd && room > 0; tqd = next)
939 {
940 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending queued data\n");
941 next = tqd->next;
942 room--;
943 send_prebuilt_message ((struct GNUNET_MessageHeader *) &tqd[1],
944 tqd->t, NULL, GNUNET_YES,
945 NULL != tqd->tq ? tqd->tq->cont : NULL,
946 NULL != tqd->tq ? tqd->tq->cont_cls : NULL,
947 tqd->tq);
948 unqueue_data (tqd);
949 }
950 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_send_queued_data end\n", GMP_2s (t->peer));
951}
952
953
954/**
955 * Sends key exchange message on a tunnel, choosing the best connection.
956 * Should not be called on loopback tunnels.
957 *
958 * @param t Tunnel on which this message is transmitted.
959 * @param message Message to send. Function modifies it.
960 */
961static void
962send_kx (struct CadetTunnel3 *t,
963 const struct GNUNET_MessageHeader *message)
964{
965 struct CadetConnection *c;
966 struct GNUNET_CADET_KX *msg;
967 size_t size = ntohs (message->size);
968 char cbuf[sizeof (struct GNUNET_CADET_KX) + size];
969 uint16_t type;
970 int fwd;
971
972 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT KX on Tunnel %s\n", GMT_2s (t));
973
974 /* Avoid loopback. */
975 if (GMT_is_loopback (t))
976 {
977 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback!\n");
978 GNUNET_break (0);
979 return;
980 }
981
982 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task)
983 {
984 LOG (GNUNET_ERROR_TYPE_DEBUG, " being destroyed, why bother\n");
985 return;
986 }
987
988 /* Must have a connection. */
989 if (NULL == t->connection_head)
990 {
991 GNUNET_break (CADET_TUNNEL3_SEARCHING == t->cstate);
992 GMT_debug (t);
993 return;
994 }
995
996 msg = (struct GNUNET_CADET_KX *) cbuf;
997 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX);
998 msg->header.size = htons (sizeof (struct GNUNET_CADET_KX) + size);
999 c = tunnel_get_connection (t);
1000 if (NULL == c)
1001 {
1002 GNUNET_break (GNUNET_SCHEDULER_NO_TASK != t->destroy_task
1003 || CADET_TUNNEL3_READY != t->cstate);
1004 GMT_debug (t);
1005 return;
1006 }
1007 type = ntohs (message->type);
1008 switch (type)
1009 {
1010 case GNUNET_MESSAGE_TYPE_CADET_KX_EPHEMERAL:
1011 case GNUNET_MESSAGE_TYPE_CADET_KX_PING:
1012 case GNUNET_MESSAGE_TYPE_CADET_KX_PONG:
1013 memcpy (&msg[1], message, size);
1014 break;
1015 default:
1016 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
1017 GM_m2s (type));
1018 GNUNET_break (0);
1019 }
1020
1021 fwd = GMC_is_origin (t->connection_head->c, GNUNET_YES);
1022 /* TODO save handle and cancel in case of a unneeded retransmission */
1023 GMC_send_prebuilt_message (&msg->header, GNUNET_MESSAGE_TYPE_CADET_KX,
1024 message->type, c, fwd, GNUNET_YES, NULL, NULL);
1025}
1026
1027
1028/**
1029 * Send the ephemeral key on a tunnel.
1030 *
1031 * @param t Tunnel on which to send the key.
1032 */
1033static void
1034send_ephemeral (struct CadetTunnel3 *t)
1035{
1036 LOG (GNUNET_ERROR_TYPE_INFO, "=> EPHM for %s\n", GMT_2s (t));
1037
1038 kx_msg.sender_status = htonl (t->estate);
1039 send_kx (t, &kx_msg.header);
1040}
1041
1042/**
1043 * Send a ping message on a tunnel.
1044 *
1045 * @param t Tunnel on which to send the ping.
1046 */
1047static void
1048send_ping (struct CadetTunnel3 *t)
1049{
1050 struct GNUNET_CADET_KX_Ping msg;
1051
1052 LOG (GNUNET_ERROR_TYPE_INFO, "=> PING for %s\n", GMT_2s (t));
1053 msg.header.size = htons (sizeof (msg));
1054 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX_PING);
1055 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1056 msg.target = *GMP_get_id (t->peer);
1057 msg.nonce = t->kx_ctx->challenge;
1058
1059 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
1060 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n", GNUNET_i2s (&msg.target));
1061 t_encrypt (t, &msg.target, &msg.target, ping_encryption_size(), msg.iv);
1062 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
1063 LOG (GNUNET_ERROR_TYPE_DEBUG, " e towards %s\n", GNUNET_i2s (&msg.target));
1064
1065 send_kx (t, &msg.header);
1066}
1067
1068
1069/**
1070 * Send a pong message on a tunnel.
1071 *
1072 * @param t Tunnel on which to send the pong.
1073 * @param challenge Value sent in the ping that we have to send back.
1074 */
1075static void
1076send_pong (struct CadetTunnel3 *t, uint32_t challenge)
1077{
1078 struct GNUNET_CADET_KX_Pong msg;
1079
1080 LOG (GNUNET_ERROR_TYPE_INFO, "=> PONG for %s\n", GMT_2s (t));
1081 msg.header.size = htons (sizeof (msg));
1082 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX_PONG);
1083 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1084 msg.nonce = challenge;
1085 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
1086 t_encrypt (t, &msg.nonce, &msg.nonce, sizeof (msg.nonce), msg.iv);
1087 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
1088
1089 send_kx (t, &msg.header);
1090}
1091
1092
1093/**
1094 * Initiate a rekey with the remote peer.
1095 *
1096 * @param cls Closure (tunnel).
1097 * @param tc TaskContext.
1098 */
1099static void
1100rekey_tunnel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1101{
1102 struct CadetTunnel3 *t = cls;
1103
1104 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
1105
1106 LOG (GNUNET_ERROR_TYPE_DEBUG, "Re-key Tunnel %s\n", GMT_2s (t));
1107 if (NULL != tc && 0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1108 return;
1109
1110 if (NULL == t->kx_ctx)
1111 {
1112 LOG (GNUNET_ERROR_TYPE_DEBUG, " new kx ctx\n");
1113 t->kx_ctx = GNUNET_new (struct CadetTunnelKXCtx);
1114 t->kx_ctx->challenge =
1115 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1116 t->kx_ctx->d_key_old = t->d_key;
1117 LOG (GNUNET_ERROR_TYPE_DEBUG, " new challenge for %s: %u\n",
1118 GMT_2s (t), t->kx_ctx->challenge);
1119 }
1120 send_ephemeral (t);
1121 switch (t->estate)
1122 {
1123 case CADET_TUNNEL3_KEY_UNINITIALIZED:
1124 t->estate = CADET_TUNNEL3_KEY_SENT;
1125 break;
1126 case CADET_TUNNEL3_KEY_SENT:
1127 break;
1128 case CADET_TUNNEL3_KEY_PING:
1129 case CADET_TUNNEL3_KEY_OK:
1130 send_ping (t);
1131 t->estate = CADET_TUNNEL3_KEY_PING;
1132 break;
1133 default:
1134 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unexpected state %u\n", t->estate);
1135 }
1136
1137 LOG (GNUNET_ERROR_TYPE_DEBUG, " next call in %s\n",
1138 GNUNET_STRINGS_relative_time_to_string (REKEY_WAIT, GNUNET_YES));
1139 t->rekey_task = GNUNET_SCHEDULER_add_delayed (REKEY_WAIT, &rekey_tunnel, t);
1140}
1141
1142
1143/**
1144 * Out ephemeral key has changed, create new session key on all tunnels.
1145 *
1146 * @param cls Closure (size of the hashmap).
1147 * @param key Current public key.
1148 * @param value Value in the hash map (tunnel).
1149 *
1150 * @return #GNUNET_YES, so we should continue to iterate,
1151 */
1152static int
1153rekey_iterator (void *cls,
1154 const struct GNUNET_PeerIdentity *key,
1155 void *value)
1156{
1157 struct CadetTunnel3 *t = value;
1158 struct GNUNET_TIME_Relative delay;
1159 long n = (long) cls;
1160 uint32_t r;
1161
1162 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
1163 return GNUNET_YES;
1164
1165 if (GNUNET_YES == GMT_is_loopback (t))
1166 return GNUNET_YES;
1167
1168 r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, (uint32_t) n * 100);
1169 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, r);
1170 t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
1171
1172 return GNUNET_YES;
1173}
1174
1175
1176/**
1177 * Create a new ephemeral key and key message, schedule next rekeying.
1178 *
1179 * @param cls Closure (unused).
1180 * @param tc TaskContext.
1181 */
1182static void
1183rekey (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1184{
1185 struct GNUNET_TIME_Absolute time;
1186 long n;
1187
1188 rekey_task = GNUNET_SCHEDULER_NO_TASK;
1189
1190 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1191 return;
1192
1193 GNUNET_free_non_null (my_ephemeral_key);
1194 my_ephemeral_key = GNUNET_CRYPTO_ecdhe_key_create ();
1195
1196 time = GNUNET_TIME_absolute_get ();
1197 kx_msg.creation_time = GNUNET_TIME_absolute_hton (time);
1198 time = GNUNET_TIME_absolute_add (time, rekey_period);
1199 time = GNUNET_TIME_absolute_add (time, GNUNET_TIME_UNIT_MINUTES);
1200 kx_msg.expiration_time = GNUNET_TIME_absolute_hton (time);
1201 GNUNET_CRYPTO_ecdhe_key_get_public (my_ephemeral_key, &kx_msg.ephemeral_key);
1202
1203 GNUNET_assert (GNUNET_OK ==
1204 GNUNET_CRYPTO_eddsa_sign (my_private_key,
1205 &kx_msg.purpose,
1206 &kx_msg.signature));
1207
1208 n = (long) GNUNET_CONTAINER_multipeermap_size (tunnels);
1209 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &rekey_iterator, (void *) n);
1210
1211 rekey_task = GNUNET_SCHEDULER_add_delayed (rekey_period, &rekey, NULL);
1212}
1213
1214
1215/**
1216 * Called only on shutdown, destroy every tunnel.
1217 *
1218 * @param cls Closure (unused).
1219 * @param key Current public key.
1220 * @param value Value in the hash map (tunnel).
1221 *
1222 * @return #GNUNET_YES, so we should continue to iterate,
1223 */
1224static int
1225destroy_iterator (void *cls,
1226 const struct GNUNET_PeerIdentity *key,
1227 void *value)
1228{
1229 struct CadetTunnel3 *t = value;
1230
1231 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_shutdown destroying tunnel at %p\n", t);
1232 GMT_destroy (t);
1233 return GNUNET_YES;
1234}
1235
1236
1237/**
1238 * Notify remote peer that we don't know a channel he is talking about,
1239 * probably CHANNEL_DESTROY was missed.
1240 *
1241 * @param t Tunnel on which to notify.
1242 * @param gid ID of the channel.
1243 */
1244static void
1245send_channel_destroy (struct CadetTunnel3 *t, unsigned int gid)
1246{
1247 struct GNUNET_CADET_ChannelManage msg;
1248
1249 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY);
1250 msg.header.size = htons (sizeof (msg));
1251 msg.chid = htonl (gid);
1252
1253 LOG (GNUNET_ERROR_TYPE_DEBUG,
1254 "WARNING destroying unknown channel %u on tunnel %s\n",
1255 gid, GMT_2s (t));
1256 send_prebuilt_message (&msg.header, t, NULL, GNUNET_YES, NULL, NULL, NULL);
1257}
1258
1259
1260/**
1261 * Demultiplex data per channel and call appropriate channel handler.
1262 *
1263 * @param t Tunnel on which the data came.
1264 * @param msg Data message.
1265 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1266 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1267 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1268 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1269 */
1270static void
1271handle_data (struct CadetTunnel3 *t,
1272 const struct GNUNET_CADET_Data *msg,
1273 int fwd)
1274{
1275 struct CadetChannel *ch;
1276 size_t size;
1277
1278 /* Check size */
1279 size = ntohs (msg->header.size);
1280 if (size <
1281 sizeof (struct GNUNET_CADET_Data) +
1282 sizeof (struct GNUNET_MessageHeader))
1283 {
1284 GNUNET_break (0);
1285 return;
1286 }
1287 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
1288 GM_m2s (ntohs (msg[1].header.type)));
1289
1290 /* Check channel */
1291 ch = GMT_get_channel (t, ntohl (msg->chid));
1292 if (NULL == ch)
1293 {
1294 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
1295 1, GNUNET_NO);
1296 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel 0x%X unknown\n",
1297 ntohl (msg->chid));
1298 send_channel_destroy (t, ntohl (msg->chid));
1299 return;
1300 }
1301
1302 GMCH_handle_data (ch, msg, fwd);
1303}
1304
1305
1306/**
1307 * Demultiplex data ACKs per channel and update appropriate channel buffer info.
1308 *
1309 * @param t Tunnel on which the DATA ACK came.
1310 * @param msg DATA ACK message.
1311 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1312 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1313 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1314 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1315 */
1316static void
1317handle_data_ack (struct CadetTunnel3 *t,
1318 const struct GNUNET_CADET_DataACK *msg,
1319 int fwd)
1320{
1321 struct CadetChannel *ch;
1322 size_t size;
1323
1324 /* Check size */
1325 size = ntohs (msg->header.size);
1326 if (size != sizeof (struct GNUNET_CADET_DataACK))
1327 {
1328 GNUNET_break (0);
1329 return;
1330 }
1331
1332 /* Check channel */
1333 ch = GMT_get_channel (t, ntohl (msg->chid));
1334 if (NULL == ch)
1335 {
1336 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
1337 1, GNUNET_NO);
1338 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1339 ntohl (msg->chid));
1340 return;
1341 }
1342
1343 GMCH_handle_data_ack (ch, msg, fwd);
1344}
1345
1346
1347/**
1348 * Handle channel create.
1349 *
1350 * @param t Tunnel on which the data came.
1351 * @param msg Data message.
1352 */
1353static void
1354handle_ch_create (struct CadetTunnel3 *t,
1355 const struct GNUNET_CADET_ChannelCreate *msg)
1356{
1357 struct CadetChannel *ch;
1358 size_t size;
1359
1360 /* Check size */
1361 size = ntohs (msg->header.size);
1362 if (size != sizeof (struct GNUNET_CADET_ChannelCreate))
1363 {
1364 GNUNET_break (0);
1365 return;
1366 }
1367
1368 /* Check channel */
1369 ch = GMT_get_channel (t, ntohl (msg->chid));
1370 if (NULL != ch && ! GMT_is_loopback (t))
1371 {
1372 /* Probably a retransmission, safe to ignore */
1373 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
1374 }
1375 ch = GMCH_handle_create (t, msg);
1376 if (NULL != ch)
1377 GMT_add_channel (t, ch);
1378}
1379
1380
1381
1382/**
1383 * Handle channel NACK: check correctness and call channel handler for NACKs.
1384 *
1385 * @param t Tunnel on which the NACK came.
1386 * @param msg NACK message.
1387 */
1388static void
1389handle_ch_nack (struct CadetTunnel3 *t,
1390 const struct GNUNET_CADET_ChannelManage *msg)
1391{
1392 struct CadetChannel *ch;
1393 size_t size;
1394
1395 /* Check size */
1396 size = ntohs (msg->header.size);
1397 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
1398 {
1399 GNUNET_break (0);
1400 return;
1401 }
1402
1403 /* Check channel */
1404 ch = GMT_get_channel (t, ntohl (msg->chid));
1405 if (NULL == ch)
1406 {
1407 GNUNET_STATISTICS_update (stats, "# channel NACK on unknown channel",
1408 1, GNUNET_NO);
1409 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1410 ntohl (msg->chid));
1411 return;
1412 }
1413
1414 GMCH_handle_nack (ch);
1415}
1416
1417
1418/**
1419 * Handle a CHANNEL ACK (SYNACK/ACK).
1420 *
1421 * @param t Tunnel on which the CHANNEL ACK came.
1422 * @param msg CHANNEL ACK message.
1423 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1424 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1425 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1426 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1427 */
1428static void
1429handle_ch_ack (struct CadetTunnel3 *t,
1430 const struct GNUNET_CADET_ChannelManage *msg,
1431 int fwd)
1432{
1433 struct CadetChannel *ch;
1434 size_t size;
1435
1436 /* Check size */
1437 size = ntohs (msg->header.size);
1438 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
1439 {
1440 GNUNET_break (0);
1441 return;
1442 }
1443
1444 /* Check channel */
1445 ch = GMT_get_channel (t, ntohl (msg->chid));
1446 if (NULL == ch)
1447 {
1448 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
1449 1, GNUNET_NO);
1450 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1451 ntohl (msg->chid));
1452 return;
1453 }
1454
1455 GMCH_handle_ack (ch, msg, fwd);
1456}
1457
1458
1459
1460/**
1461 * Handle a channel destruction message.
1462 *
1463 * @param t Tunnel on which the message came.
1464 * @param msg Channel destroy message.
1465 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1466 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1467 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1468 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1469 */
1470static void
1471handle_ch_destroy (struct CadetTunnel3 *t,
1472 const struct GNUNET_CADET_ChannelManage *msg,
1473 int fwd)
1474{
1475 struct CadetChannel *ch;
1476 size_t size;
1477
1478 /* Check size */
1479 size = ntohs (msg->header.size);
1480 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
1481 {
1482 GNUNET_break (0);
1483 return;
1484 }
1485
1486 /* Check channel */
1487 ch = GMT_get_channel (t, ntohl (msg->chid));
1488 if (NULL == ch)
1489 {
1490 /* Probably a retransmission, safe to ignore */
1491 return;
1492 }
1493
1494 GMCH_handle_destroy (ch, msg, fwd);
1495}
1496
1497
1498/**
1499 * The peer's ephemeral key has changed: update the symmetrical keys.
1500 *
1501 * @param t Tunnel this message came on.
1502 * @param msg Key eXchange message.
1503 */
1504static void
1505handle_ephemeral (struct CadetTunnel3 *t,
1506 const struct GNUNET_CADET_KX_Ephemeral *msg)
1507{
1508 struct GNUNET_HashCode km;
1509 LOG (GNUNET_ERROR_TYPE_INFO, "<=== EPHM for %s\n", GMT_2s (t));
1510
1511 if (GNUNET_OK != check_ephemeral (t, msg))
1512 {
1513 GNUNET_break_op (0);
1514 return;
1515 }
1516 derive_key_material (&km, &msg->ephemeral_key);
1517 LOG (GNUNET_ERROR_TYPE_DEBUG, " km is %s\n", GNUNET_h2s (&km));
1518 derive_symmertic (&t->e_key, &my_full_id, GMP_get_id (t->peer), &km);
1519 derive_symmertic (&t->d_key, GMP_get_id (t->peer), &my_full_id, &km);
1520 if (CADET_TUNNEL3_KEY_SENT == t->estate)
1521 {
1522 LOG (GNUNET_ERROR_TYPE_DEBUG, " our key was sent, send ping\n");
1523 send_ping (t);
1524 t->estate = CADET_TUNNEL3_KEY_PING;
1525 }
1526}
1527
1528
1529/**
1530 * Peer wants to check our symmetrical keys by sending an encrypted challenge.
1531 * Answer with by retransmitting the challenge with the "opposite" key.
1532 *
1533 * @param t Tunnel this message came on.
1534 * @param msg Key eXchange Ping message.
1535 */
1536static void
1537handle_ping (struct CadetTunnel3 *t,
1538 const struct GNUNET_CADET_KX_Ping *msg)
1539{
1540 struct GNUNET_CADET_KX_Ping res;
1541
1542 if (ntohs (msg->header.size) != sizeof (res))
1543 {
1544 GNUNET_break_op (0);
1545 return;
1546 }
1547
1548 LOG (GNUNET_ERROR_TYPE_INFO, "<=== PING for %s\n", GMT_2s (t));
1549 t_decrypt (t, &res.target, &msg->target, ping_encryption_size (), msg->iv);
1550 if (0 != memcmp (&my_full_id, &res.target, sizeof (my_full_id)))
1551 {
1552 // FIXME: move to debug
1553 GNUNET_STATISTICS_update (stats, "# malformed PINGs", 1, GNUNET_NO);
1554 LOG (GNUNET_ERROR_TYPE_WARNING, " malformed PING on %s\n", GMT_2s (t));
1555 LOG (GNUNET_ERROR_TYPE_WARNING, " e got %u\n", msg->nonce);
1556 LOG (GNUNET_ERROR_TYPE_WARNING, " e towards %s\n", GNUNET_i2s (&msg->target));
1557 LOG (GNUNET_ERROR_TYPE_WARNING, " got %u\n", res.nonce);
1558 LOG (GNUNET_ERROR_TYPE_WARNING, " towards %s\n", GNUNET_i2s (&res.target));
1559 return;
1560 }
1561
1562 send_pong (t, res.nonce);
1563}
1564
1565
1566/**
1567 * Peer has answer to our challenge.
1568 * If answer is successful, consider the key exchange finished and clean
1569 * up all related state.
1570 *
1571 * @param t Tunnel this message came on.
1572 * @param msg Key eXchange Pong message.
1573 */
1574static void
1575handle_pong (struct CadetTunnel3 *t,
1576 const struct GNUNET_CADET_KX_Pong *msg)
1577{
1578 uint32_t challenge;
1579
1580 LOG (GNUNET_ERROR_TYPE_INFO, "<=== PONG for %s\n", GMT_2s (t));
1581 if (GNUNET_SCHEDULER_NO_TASK == t->rekey_task)
1582 {
1583 GNUNET_STATISTICS_update (stats, "# duplicate PONG messages", 1, GNUNET_NO);
1584 return;
1585 }
1586 t_decrypt (t, &challenge, &msg->nonce, sizeof (uint32_t), msg->iv);
1587
1588 if (challenge != t->kx_ctx->challenge)
1589 {
1590 LOG (GNUNET_ERROR_TYPE_WARNING, "Wrong PONG challenge\n");
1591 LOG (GNUNET_ERROR_TYPE_DEBUG, "PONG: %u (e: %u). Expected: %u.\n",
1592 challenge, msg->nonce, t->kx_ctx->challenge);
1593 GNUNET_break_op (0);
1594 return;
1595 }
1596 GNUNET_SCHEDULER_cancel (t->rekey_task);
1597 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
1598 GNUNET_free (t->kx_ctx);
1599 t->kx_ctx = NULL;
1600 GMT_change_estate (t, CADET_TUNNEL3_KEY_OK);
1601}
1602
1603
1604/**
1605 * Demultiplex by message type and call appropriate handler for a message
1606 * towards a channel of a local tunnel.
1607 *
1608 * @param t Tunnel this message came on.
1609 * @param msgh Message header.
1610 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1611 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1612 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1613 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1614 */
1615static void
1616handle_decrypted (struct CadetTunnel3 *t,
1617 const struct GNUNET_MessageHeader *msgh,
1618 int fwd)
1619{
1620 uint16_t type;
1621
1622 type = ntohs (msgh->type);
1623 LOG (GNUNET_ERROR_TYPE_INFO, "<=== %s on %s\n", GM_m2s (type), GMT_2s (t));
1624
1625 switch (type)
1626 {
1627 case GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE:
1628 /* Do nothing, connection aleady got updated. */
1629 GNUNET_STATISTICS_update (stats, "# keepalives received", 1, GNUNET_NO);
1630 break;
1631
1632 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1633 /* Don't send hop ACK, wait for client to ACK */
1634 handle_data (t, (struct GNUNET_CADET_Data *) msgh, fwd);
1635 break;
1636
1637 case GNUNET_MESSAGE_TYPE_CADET_DATA_ACK:
1638 handle_data_ack (t, (struct GNUNET_CADET_DataACK *) msgh, fwd);
1639 break;
1640
1641 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1642 handle_ch_create (t,
1643 (struct GNUNET_CADET_ChannelCreate *) msgh);
1644 break;
1645
1646 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_NACK:
1647 handle_ch_nack (t,
1648 (struct GNUNET_CADET_ChannelManage *) msgh);
1649 break;
1650
1651 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_ACK:
1652 handle_ch_ack (t,
1653 (struct GNUNET_CADET_ChannelManage *) msgh,
1654 fwd);
1655 break;
1656
1657 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1658 handle_ch_destroy (t,
1659 (struct GNUNET_CADET_ChannelManage *) msgh,
1660 fwd);
1661 break;
1662
1663 default:
1664 GNUNET_break_op (0);
1665 LOG (GNUNET_ERROR_TYPE_WARNING,
1666 "end-to-end message not known (%u)\n",
1667 ntohs (msgh->type));
1668 GMT_debug (t);
1669 }
1670}
1671
1672/******************************************************************************/
1673/******************************** API ***********************************/
1674/******************************************************************************/
1675
1676/**
1677 * Decrypt and demultiplex by message type. Call appropriate handler
1678 * for every message.
1679 *
1680 * @param t Tunnel this message came on.
1681 * @param msg Encrypted message.
1682 */
1683void
1684GMT_handle_encrypted (struct CadetTunnel3 *t,
1685 const struct GNUNET_CADET_Encrypted *msg)
1686{
1687 size_t size = ntohs (msg->header.size);
1688 size_t payload_size = size - sizeof (struct GNUNET_CADET_Encrypted);
1689 size_t decrypted_size;
1690 char cbuf [payload_size];
1691 struct GNUNET_MessageHeader *msgh;
1692 unsigned int off;
1693 struct GNUNET_CADET_Hash hmac;
1694
1695 decrypted_size = t_decrypt (t, cbuf, &msg[1], payload_size, msg->iv);
1696 t_hmac (t, &msg[1], payload_size, msg->iv, GNUNET_NO, &hmac);
1697 if (0 != memcmp (&hmac, &msg->hmac, sizeof (hmac)))
1698 {
1699 /* checksum failed */
1700 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1701 "Failed checksum validation for a message on tunnel `%s'\n",
1702 GMT_2s (t));
1703 GNUNET_STATISTICS_update (stats, "# wrong HMAC", 1, GNUNET_NO);
1704 return;
1705 }
1706 off = 0;
1707 while (off < decrypted_size)
1708 {
1709 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
1710 handle_decrypted (t, msgh, GNUNET_SYSERR);
1711 off += ntohs (msgh->size);
1712 }
1713}
1714
1715
1716/**
1717 * Demultiplex an encapsulated KX message by message type.
1718 *
1719 * @param t Tunnel on which the message came.
1720 * @param message Payload of KX message.
1721 */
1722void
1723GMT_handle_kx (struct CadetTunnel3 *t,
1724 const struct GNUNET_MessageHeader *message)
1725{
1726 uint16_t type;
1727
1728 type = ntohs (message->type);
1729 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message received\n", type);
1730 switch (type)
1731 {
1732 case GNUNET_MESSAGE_TYPE_CADET_KX_EPHEMERAL:
1733 handle_ephemeral (t, (struct GNUNET_CADET_KX_Ephemeral *) message);
1734 break;
1735
1736 case GNUNET_MESSAGE_TYPE_CADET_KX_PING:
1737 handle_ping (t, (struct GNUNET_CADET_KX_Ping *) message);
1738 break;
1739
1740 case GNUNET_MESSAGE_TYPE_CADET_KX_PONG:
1741 handle_pong (t, (struct GNUNET_CADET_KX_Pong *) message);
1742 break;
1743
1744 default:
1745 GNUNET_break_op (0);
1746 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message not known (%u)\n", type);
1747 }
1748}
1749
1750
1751/**
1752 * Initialize the tunnel subsystem.
1753 *
1754 * @param c Configuration handle.
1755 * @param key ECC private key, to derive all other keys and do crypto.
1756 */
1757void
1758GMT_init (const struct GNUNET_CONFIGURATION_Handle *c,
1759 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
1760{
1761 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
1762 if (GNUNET_OK !=
1763 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DEFAULT_TTL",
1764 &default_ttl))
1765 {
1766 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1767 "CADET", "DEFAULT_TTL", "USING DEFAULT");
1768 default_ttl = 64;
1769 }
1770 if (GNUNET_OK !=
1771 GNUNET_CONFIGURATION_get_value_time (c, "CADET", "REKEY_PERIOD",
1772 &rekey_period))
1773 {
1774 rekey_period = GNUNET_TIME_UNIT_DAYS;
1775 }
1776
1777 my_private_key = key;
1778 kx_msg.header.size = htons (sizeof (kx_msg));
1779 kx_msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX_EPHEMERAL);
1780 kx_msg.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CADET_KX);
1781 kx_msg.purpose.size = htonl (ephemeral_purpose_size ());
1782 kx_msg.origin_identity = my_full_id;
1783 rekey_task = GNUNET_SCHEDULER_add_now (&rekey, NULL);
1784
1785 tunnels = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
1786}
1787
1788
1789/**
1790 * Shut down the tunnel subsystem.
1791 */
1792void
1793GMT_shutdown (void)
1794{
1795 if (GNUNET_SCHEDULER_NO_TASK != rekey_task)
1796 {
1797 GNUNET_SCHEDULER_cancel (rekey_task);
1798 rekey_task = GNUNET_SCHEDULER_NO_TASK;
1799 }
1800 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &destroy_iterator, NULL);
1801 GNUNET_CONTAINER_multipeermap_destroy (tunnels);
1802}
1803
1804
1805/**
1806 * Create a tunnel.
1807 *
1808 * @param destination Peer this tunnel is towards.
1809 */
1810struct CadetTunnel3 *
1811GMT_new (struct CadetPeer *destination)
1812{
1813 struct CadetTunnel3 *t;
1814
1815 t = GNUNET_new (struct CadetTunnel3);
1816 t->next_chid = 0;
1817 t->peer = destination;
1818
1819 if (GNUNET_OK !=
1820 GNUNET_CONTAINER_multipeermap_put (tunnels, GMP_get_id (destination), t,
1821 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1822 {
1823 GNUNET_break (0);
1824 GNUNET_free (t);
1825 return NULL;
1826 }
1827 return t;
1828}
1829
1830
1831/**
1832 * Change the tunnel's connection state.
1833 *
1834 * @param t Tunnel whose connection state to change.
1835 * @param cstate New connection state.
1836 */
1837void
1838GMT_change_cstate (struct CadetTunnel3* t, enum CadetTunnel3CState cstate)
1839{
1840 if (NULL == t)
1841 return;
1842 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s cstate %s => %s\n",
1843 GMP_2s (t->peer), cstate2s (t->cstate), cstate2s (cstate));
1844 if (myid != GMP_get_short_id (t->peer) &&
1845 CADET_TUNNEL3_READY != t->cstate &&
1846 CADET_TUNNEL3_READY == cstate)
1847 {
1848 t->cstate = cstate;
1849 if (CADET_TUNNEL3_KEY_OK == t->estate)
1850 {
1851 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered send queued data\n");
1852 send_queued_data (t);
1853 }
1854 else if (CADET_TUNNEL3_KEY_UNINITIALIZED == t->estate)
1855 {
1856 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered rekey\n");
1857 rekey_tunnel (t, NULL);
1858 }
1859 }
1860 t->cstate = cstate;
1861
1862 if (CADET_TUNNEL3_READY == cstate
1863 && CONNECTIONS_PER_TUNNEL <= GMT_count_connections (t))
1864 {
1865 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered stop dht\n");
1866 GMP_stop_search (t->peer);
1867 }
1868}
1869
1870/**
1871 * Change the tunnel encryption state.
1872 *
1873 * @param t Tunnel whose encryption state to change.
1874 * @param state New encryption state.
1875 */
1876void
1877GMT_change_estate (struct CadetTunnel3* t, enum CadetTunnel3EState state)
1878{
1879 if (NULL == t)
1880 return;
1881 LOG (GNUNET_ERROR_TYPE_DEBUG,
1882 "Tunnel %s estate was %s\n",
1883 GMP_2s (t->peer), estate2s (t->estate));
1884 LOG (GNUNET_ERROR_TYPE_DEBUG,
1885 "Tunnel %s estate is now %s\n",
1886 GMP_2s (t->peer), estate2s (state));
1887 if (myid != GMP_get_short_id (t->peer) &&
1888 CADET_TUNNEL3_KEY_OK != t->estate && CADET_TUNNEL3_KEY_OK == state)
1889 {
1890 t->estate = state;
1891 send_queued_data (t);
1892 return;
1893 }
1894 t->estate = state;
1895}
1896
1897
1898/**
1899 * @brief Check if tunnel has too many connections, and remove one if necessary.
1900 *
1901 * Currently this means the newest connection, unless it is a direct one.
1902 * Implemented as a task to avoid freeing a connection that is in the middle
1903 * of being created/processed.
1904 *
1905 * @param cls Closure (Tunnel to check).
1906 * @param tc Task context.
1907 */
1908static void
1909trim_connections (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1910{
1911 struct CadetTunnel3 *t = cls;
1912
1913 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1914 return;
1915
1916 if (GMT_count_connections (t) > 2 * CONNECTIONS_PER_TUNNEL)
1917 {
1918 struct CadetTConnection *iter;
1919 struct CadetTConnection *c;
1920
1921 for (c = iter = t->connection_head; NULL != iter; iter = iter->next)
1922 {
1923 if ((NULL == c || iter->created.abs_value_us > c->created.abs_value_us)
1924 && GNUNET_NO == GMC_is_direct (iter->c))
1925 {
1926 c = iter;
1927 }
1928 }
1929 if (NULL != c)
1930 {
1931 LOG (GNUNET_ERROR_TYPE_DEBUG, "Too many connections on tunnel %s\n",
1932 GMT_2s (t));
1933 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying connection %s\n",
1934 GMC_2s (c->c));
1935 GMC_destroy (c->c);
1936 }
1937 else
1938 {
1939 GNUNET_break (0);
1940 }
1941 }
1942}
1943
1944
1945/**
1946 * Add a connection to a tunnel.
1947 *
1948 * @param t Tunnel.
1949 * @param c Connection.
1950 */
1951void
1952GMT_add_connection (struct CadetTunnel3 *t, struct CadetConnection *c)
1953{
1954 struct CadetTConnection *aux;
1955
1956 GNUNET_assert (NULL != c);
1957
1958 LOG (GNUNET_ERROR_TYPE_DEBUG, "add connection %s\n", GMC_2s (c));
1959 LOG (GNUNET_ERROR_TYPE_DEBUG, " to tunnel %s\n", GMT_2s (t));
1960 for (aux = t->connection_head; aux != NULL; aux = aux->next)
1961 if (aux->c == c)
1962 return;
1963
1964 aux = GNUNET_new (struct CadetTConnection);
1965 aux->c = c;
1966 aux->created = GNUNET_TIME_absolute_get ();
1967
1968 GNUNET_CONTAINER_DLL_insert (t->connection_head, t->connection_tail, aux);
1969
1970 GNUNET_SCHEDULER_add_now (&trim_connections, t);
1971}
1972
1973
1974/**
1975 * Mark a path as no longer valid for this tunnel: has been tried and failed.
1976 *
1977 * @param t Tunnel to update.
1978 * @param path Invalid path to remove. Is destroyed after removal.
1979 */
1980void
1981GMT_remove_path (struct CadetTunnel3 *t, struct CadetPeerPath *path)
1982{
1983 GMP_remove_path (t->peer, path);
1984}
1985
1986
1987/**
1988 * Remove a connection from a tunnel.
1989 *
1990 * @param t Tunnel.
1991 * @param c Connection.
1992 */
1993void
1994GMT_remove_connection (struct CadetTunnel3 *t,
1995 struct CadetConnection *c)
1996{
1997 struct CadetTConnection *aux;
1998 struct CadetTConnection *next;
1999
2000 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing connection %s from tunnel %s\n",
2001 GMC_2s (c), GMT_2s (t));
2002 for (aux = t->connection_head; aux != NULL; aux = next)
2003 {
2004 next = aux->next;
2005 if (aux->c == c)
2006 {
2007 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
2008 GNUNET_free (aux);
2009 }
2010 }
2011
2012 /* Start new connections if needed */
2013 if (CONNECTIONS_PER_TUNNEL < GMT_count_connections (t)
2014 && GNUNET_SCHEDULER_NO_TASK == t->destroy_task
2015 && CADET_TUNNEL3_SHUTDOWN != t->cstate
2016 && GNUNET_NO == shutting_down)
2017 {
2018 LOG (GNUNET_ERROR_TYPE_DEBUG, " no more connections, getting new ones\n");
2019 t->cstate = CADET_TUNNEL3_SEARCHING;
2020 GMP_connect (t->peer);
2021 return;
2022 }
2023
2024 /* If not marked as ready, no change is needed */
2025 if (CADET_TUNNEL3_READY != t->cstate)
2026 return;
2027
2028 /* Check if any connection is ready to maintaing cstate */
2029 for (aux = t->connection_head; aux != NULL; aux = aux->next)
2030 if (CADET_CONNECTION_READY == GMC_get_state (aux->c))
2031 return;
2032
2033 t->cstate = CADET_TUNNEL3_WAITING;
2034}
2035
2036
2037/**
2038 * Add a channel to a tunnel.
2039 *
2040 * @param t Tunnel.
2041 * @param ch Channel.
2042 */
2043void
2044GMT_add_channel (struct CadetTunnel3 *t, struct CadetChannel *ch)
2045{
2046 struct CadetTChannel *aux;
2047
2048 GNUNET_assert (NULL != ch);
2049
2050 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
2051
2052 for (aux = t->channel_head; aux != NULL; aux = aux->next)
2053 {
2054 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
2055 if (aux->ch == ch)
2056 return;
2057 }
2058
2059 aux = GNUNET_new (struct CadetTChannel);
2060 aux->ch = ch;
2061 LOG (GNUNET_ERROR_TYPE_DEBUG, " adding %p to %p\n", aux, t->channel_head);
2062 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
2063
2064 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task)
2065 {
2066 GNUNET_SCHEDULER_cancel (t->destroy_task);
2067 t->destroy_task = GNUNET_SCHEDULER_NO_TASK;
2068 LOG (GNUNET_ERROR_TYPE_DEBUG, " undo destroy!\n");
2069 }
2070}
2071
2072
2073/**
2074 * Remove a channel from a tunnel.
2075 *
2076 * @param t Tunnel.
2077 * @param ch Channel.
2078 */
2079void
2080GMT_remove_channel (struct CadetTunnel3 *t, struct CadetChannel *ch)
2081{
2082 struct CadetTChannel *aux;
2083
2084 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
2085 for (aux = t->channel_head; aux != NULL; aux = aux->next)
2086 {
2087 if (aux->ch == ch)
2088 {
2089 LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GMCH_2s (ch));
2090 GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
2091 GNUNET_free (aux);
2092 return;
2093 }
2094 }
2095}
2096
2097
2098/**
2099 * Search for a channel by global ID.
2100 *
2101 * @param t Tunnel containing the channel.
2102 * @param chid Public channel number.
2103 *
2104 * @return channel handler, NULL if doesn't exist
2105 */
2106struct CadetChannel *
2107GMT_get_channel (struct CadetTunnel3 *t, CADET_ChannelNumber chid)
2108{
2109 struct CadetTChannel *iter;
2110
2111 if (NULL == t)
2112 return NULL;
2113
2114 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2115 {
2116 if (GMCH_get_id (iter->ch) == chid)
2117 break;
2118 }
2119
2120 return NULL == iter ? NULL : iter->ch;
2121}
2122
2123
2124/**
2125 * @brief Destroy a tunnel and free all resources.
2126 *
2127 * Should only be called a while after the tunnel has been marked as destroyed,
2128 * in case there is a new channel added to the same peer shortly after marking
2129 * the tunnel. This way we avoid a new public key handshake.
2130 *
2131 * @param cls Closure (tunnel to destroy).
2132 * @param tc Task context.
2133 */
2134static void
2135delayed_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2136{
2137 struct CadetTunnel3 *t = cls;
2138 struct CadetTConnection *iter;
2139
2140 LOG (GNUNET_ERROR_TYPE_DEBUG, "delayed destroying tunnel %p\n", t);
2141 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
2142 {
2143 LOG (GNUNET_ERROR_TYPE_WARNING,
2144 "Not destroying tunnel, due to shutdown. "
2145 "Tunnel at %p should have been freed by GMT_shutdown\n", t);
2146 return;
2147 }
2148 t->destroy_task = GNUNET_SCHEDULER_NO_TASK;
2149 t->cstate = CADET_TUNNEL3_SHUTDOWN;
2150
2151 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2152 {
2153 GMC_send_destroy (iter->c);
2154 }
2155 GMT_destroy (t);
2156}
2157
2158
2159/**
2160 * Tunnel is empty: destroy it.
2161 *
2162 * Notifies all connections about the destruction.
2163 *
2164 * @param t Tunnel to destroy.
2165 */
2166void
2167GMT_destroy_empty (struct CadetTunnel3 *t)
2168{
2169 if (GNUNET_YES == shutting_down)
2170 return; /* Will be destroyed immediately anyway */
2171
2172 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task)
2173 {
2174 LOG (GNUNET_ERROR_TYPE_DEBUG,
2175 "Tunnel %s is already scheduled for destruction\n",
2176 GMT_2s (t));
2177 GNUNET_break (0);
2178 /* should never happen, tunnel can only become empty once, and the
2179 * task identifier should be NO_TASK (cleaned when the tunnel was created
2180 * or became un-empty)
2181 */
2182 return;
2183 }
2184
2185 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s empty: destroying scheduled\n",
2186 GMT_2s (t));
2187
2188 t->destroy_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
2189 &delayed_destroy, t);
2190 LOG (GNUNET_ERROR_TYPE_DEBUG, "Scheduled destroy of %p as %llX\n",
2191 t, t->destroy_task);
2192}
2193
2194
2195/**
2196 * Destroy tunnel if empty (no more channels).
2197 *
2198 * @param t Tunnel to destroy if empty.
2199 */
2200void
2201GMT_destroy_if_empty (struct CadetTunnel3 *t)
2202{
2203 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s destroy if empty\n", GMT_2s (t));
2204 if (1 < GMT_count_channels (t))
2205 return;
2206
2207 GMT_destroy_empty (t);
2208}
2209
2210
2211/**
2212 * Destroy the tunnel.
2213 *
2214 * This function does not generate any warning traffic to clients or peers.
2215 *
2216 * Tasks:
2217 * Cancel messages belonging to this tunnel queued to neighbors.
2218 * Free any allocated resources linked to the tunnel.
2219 *
2220 * @param t The tunnel to destroy.
2221 */
2222void
2223GMT_destroy (struct CadetTunnel3 *t)
2224{
2225 struct CadetTConnection *iter_c;
2226 struct CadetTConnection *next_c;
2227 struct CadetTChannel *iter_ch;
2228 struct CadetTChannel *next_ch;
2229
2230 if (NULL == t)
2231 return;
2232
2233 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GMP_2s (t->peer));
2234
2235 GNUNET_break (GNUNET_YES ==
2236 GNUNET_CONTAINER_multipeermap_remove (tunnels,
2237 GMP_get_id (t->peer), t));
2238
2239 for (iter_c = t->connection_head; NULL != iter_c; iter_c = next_c)
2240 {
2241 next_c = iter_c->next;
2242 GMC_destroy (iter_c->c);
2243 }
2244 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = next_ch)
2245 {
2246 next_ch = iter_ch->next;
2247 GMCH_destroy (iter_ch->ch);
2248 /* Should only happen on shutdown, but it's ok. */
2249 }
2250
2251 if (GNUNET_SCHEDULER_NO_TASK != t->destroy_task)
2252 {
2253 LOG (GNUNET_ERROR_TYPE_DEBUG, "cancelling %llX\n", t->destroy_task);
2254 GNUNET_SCHEDULER_cancel (t->destroy_task);
2255 t->destroy_task = GNUNET_SCHEDULER_NO_TASK;
2256 }
2257
2258 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2259 GMP_set_tunnel (t->peer, NULL);
2260
2261 if (GNUNET_SCHEDULER_NO_TASK != t->rekey_task)
2262 {
2263 GNUNET_SCHEDULER_cancel (t->rekey_task);
2264 t->rekey_task = GNUNET_SCHEDULER_NO_TASK;
2265 if (NULL != t->kx_ctx)
2266 GNUNET_free (t->kx_ctx);
2267 else
2268 GNUNET_break (0);
2269 }
2270
2271 GNUNET_free (t);
2272}
2273
2274
2275/**
2276 * @brief Use the given path for the tunnel.
2277 * Update the next and prev hops (and RCs).
2278 * (Re)start the path refresh in case the tunnel is locally owned.
2279 *
2280 * @param t Tunnel to update.
2281 * @param p Path to use.
2282 *
2283 * @return Connection created.
2284 */
2285struct CadetConnection *
2286GMT_use_path (struct CadetTunnel3 *t, struct CadetPeerPath *p)
2287{
2288 struct CadetConnection *c;
2289 struct GNUNET_CADET_Hash cid;
2290 unsigned int own_pos;
2291
2292 if (NULL == t || NULL == p)
2293 {
2294 GNUNET_break (0);
2295 return NULL;
2296 }
2297
2298 if (CADET_TUNNEL3_SHUTDOWN == t->cstate)
2299 {
2300 GNUNET_break (0);
2301 return NULL;
2302 }
2303
2304 for (own_pos = 0; own_pos < p->length; own_pos++)
2305 {
2306 if (p->peers[own_pos] == myid)
2307 break;
2308 }
2309 if (own_pos >= p->length)
2310 {
2311 GNUNET_break_op (0);
2312 return NULL;
2313 }
2314
2315 GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE, &cid, sizeof (cid));
2316 c = GMC_new (&cid, t, p, own_pos);
2317 if (NULL == c)
2318 {
2319 /* Path was flawed */
2320 return NULL;
2321 }
2322 GMT_add_connection (t, c);
2323 return c;
2324}
2325
2326
2327/**
2328 * Count established (ready) connections of a tunnel.
2329 *
2330 * @param t Tunnel on which to count.
2331 *
2332 * @return Number of connections.
2333 */
2334unsigned int
2335GMT_count_connections (struct CadetTunnel3 *t)
2336{
2337 struct CadetTConnection *iter;
2338 unsigned int count;
2339
2340 if (NULL == t)
2341 return 0;
2342
2343 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2344 if (CADET_CONNECTION_DESTROYED != GMC_get_state (iter->c))
2345 count++;
2346
2347 return count;
2348}
2349
2350/**
2351 * Count channels of a tunnel.
2352 *
2353 * @param t Tunnel on which to count.
2354 *
2355 * @return Number of channels.
2356 */
2357unsigned int
2358GMT_count_channels (struct CadetTunnel3 *t)
2359{
2360 struct CadetTChannel *iter;
2361 unsigned int count;
2362
2363 for (count = 0, iter = t->channel_head;
2364 NULL != iter;
2365 iter = iter->next, count++) /* skip */;
2366
2367 return count;
2368}
2369
2370
2371/**
2372 * Get the connectivity state of a tunnel.
2373 *
2374 * @param t Tunnel.
2375 *
2376 * @return Tunnel's connectivity state.
2377 */
2378enum CadetTunnel3CState
2379GMT_get_cstate (struct CadetTunnel3 *t)
2380{
2381 if (NULL == t)
2382 {
2383 GNUNET_assert (0);
2384 return (enum CadetTunnel3CState) -1;
2385 }
2386 return t->cstate;
2387}
2388
2389
2390/**
2391 * Get the encryption state of a tunnel.
2392 *
2393 * @param t Tunnel.
2394 *
2395 * @return Tunnel's encryption state.
2396 */
2397enum CadetTunnel3EState
2398GMT_get_estate (struct CadetTunnel3 *t)
2399{
2400 if (NULL == t)
2401 {
2402 GNUNET_assert (0);
2403 return (enum CadetTunnel3EState) -1;
2404 }
2405 return t->estate;
2406}
2407
2408/**
2409 * Get the maximum buffer space for a tunnel towards a local client.
2410 *
2411 * @param t Tunnel.
2412 *
2413 * @return Biggest buffer space offered by any channel in the tunnel.
2414 */
2415unsigned int
2416GMT_get_channels_buffer (struct CadetTunnel3 *t)
2417{
2418 struct CadetTChannel *iter;
2419 unsigned int buffer;
2420 unsigned int ch_buf;
2421
2422 if (NULL == t->channel_head)
2423 {
2424 /* Probably getting buffer for a channel create/handshake. */
2425 return 64;
2426 }
2427
2428 buffer = 0;
2429 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2430 {
2431 ch_buf = get_channel_buffer (iter);
2432 if (ch_buf > buffer)
2433 buffer = ch_buf;
2434 }
2435 return buffer;
2436}
2437
2438
2439/**
2440 * Get the total buffer space for a tunnel for P2P traffic.
2441 *
2442 * @param t Tunnel.
2443 *
2444 * @return Buffer space offered by all connections in the tunnel.
2445 */
2446unsigned int
2447GMT_get_connections_buffer (struct CadetTunnel3 *t)
2448{
2449 struct CadetTConnection *iter;
2450 unsigned int buffer;
2451
2452 buffer = 0;
2453 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2454 {
2455 if (GMC_get_state (iter->c) != CADET_CONNECTION_READY)
2456 {
2457 continue;
2458 }
2459 buffer += get_connection_buffer (iter);
2460 }
2461
2462 return buffer;
2463}
2464
2465
2466/**
2467 * Get the tunnel's destination.
2468 *
2469 * @param t Tunnel.
2470 *
2471 * @return ID of the destination peer.
2472 */
2473const struct GNUNET_PeerIdentity *
2474GMT_get_destination (struct CadetTunnel3 *t)
2475{
2476 return GMP_get_id (t->peer);
2477}
2478
2479
2480/**
2481 * Get the tunnel's next free global channel ID.
2482 *
2483 * @param t Tunnel.
2484 *
2485 * @return GID of a channel free to use.
2486 */
2487CADET_ChannelNumber
2488GMT_get_next_chid (struct CadetTunnel3 *t)
2489{
2490 CADET_ChannelNumber chid;
2491 CADET_ChannelNumber mask;
2492 int result;
2493
2494 /* Set bit 30 depending on the ID relationship. Bit 31 is always 0 for GID.
2495 * If our ID is bigger or loopback tunnel, start at 0, bit 30 = 0
2496 * If peer's ID is bigger, start at 0x4... bit 30 = 1
2497 */
2498 result = GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, GMP_get_id (t->peer));
2499 if (0 > result)
2500 mask = 0x40000000;
2501 else
2502 mask = 0x0;
2503 t->next_chid |= mask;
2504
2505 while (NULL != GMT_get_channel (t, t->next_chid))
2506 {
2507 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
2508 t->next_chid = (t->next_chid + 1) & ~GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
2509 t->next_chid |= mask;
2510 }
2511 chid = t->next_chid;
2512 t->next_chid = (t->next_chid + 1) & ~GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
2513 t->next_chid |= mask;
2514
2515 return chid;
2516}
2517
2518
2519/**
2520 * Send ACK on one or more channels due to buffer in connections.
2521 *
2522 * @param t Channel which has some free buffer space.
2523 */
2524void
2525GMT_unchoke_channels (struct CadetTunnel3 *t)
2526{
2527 struct CadetTChannel *iter;
2528 unsigned int buffer;
2529 unsigned int channels = GMT_count_channels (t);
2530 unsigned int choked_n;
2531 struct CadetChannel *choked[channels];
2532
2533 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT_unchoke_channels on %s\n", GMT_2s (t));
2534 LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
2535 if (NULL != t->channel_head)
2536 LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
2537
2538 /* Get buffer space */
2539 buffer = GMT_get_connections_buffer (t);
2540 if (0 == buffer)
2541 {
2542 return;
2543 }
2544
2545 /* Count and remember choked channels */
2546 choked_n = 0;
2547 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2548 {
2549 if (GNUNET_NO == get_channel_allowed (iter))
2550 {
2551 choked[choked_n++] = iter->ch;
2552 }
2553 }
2554
2555 /* Unchoke random channels */
2556 while (0 < buffer && 0 < choked_n)
2557 {
2558 unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2559 choked_n);
2560 GMCH_allow_client (choked[r], GMCH_is_origin (choked[r], GNUNET_YES));
2561 choked_n--;
2562 buffer--;
2563 choked[r] = choked[choked_n];
2564 }
2565}
2566
2567
2568/**
2569 * Send ACK on one or more connections due to buffer space to the client.
2570 *
2571 * Iterates all connections of the tunnel and sends ACKs appropriately.
2572 *
2573 * @param t Tunnel.
2574 */
2575void
2576GMT_send_connection_acks (struct CadetTunnel3 *t)
2577{
2578 struct CadetTConnection *iter;
2579 uint32_t allowed;
2580 uint32_t to_allow;
2581 uint32_t allow_per_connection;
2582 unsigned int cs;
2583 unsigned int buffer;
2584
2585 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel send connection ACKs on %s\n",
2586 GMT_2s (t));
2587
2588 if (NULL == t)
2589 {
2590 GNUNET_break (0);
2591 return;
2592 }
2593
2594 buffer = GMT_get_channels_buffer (t);
2595 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer %u\n", buffer);
2596
2597 /* Count connections, how many messages are already allowed */
2598 cs = GMT_count_connections (t);
2599 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2600 {
2601 allowed += get_connection_allowed (iter);
2602 }
2603 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowed %u\n", allowed);
2604
2605 /* Make sure there is no overflow */
2606 if (allowed > buffer)
2607 {
2608 return;
2609 }
2610
2611 /* Authorize connections to send more data */
2612 to_allow = buffer; /* - allowed; */
2613
2614 for (iter = t->connection_head;
2615 NULL != iter && to_allow > 0;
2616 iter = iter->next)
2617 {
2618 allow_per_connection = to_allow/cs;
2619 to_allow -= allow_per_connection;
2620 cs--;
2621 if (get_connection_allowed (iter) > 64 / 3)
2622 {
2623 continue;
2624 }
2625 GMC_allow (iter->c, allow_per_connection,
2626 GMC_is_origin (iter->c, GNUNET_NO));
2627 }
2628
2629 GNUNET_break (to_allow == 0);
2630}
2631
2632
2633/**
2634 * Cancel a previously sent message while it's in the queue.
2635 *
2636 * ONLY can be called before the continuation given to the send function
2637 * is called. Once the continuation is called, the message is no longer in the
2638 * queue.
2639 *
2640 * @param q Handle to the queue.
2641 */
2642void
2643GMT_cancel (struct CadetTunnel3Queue *q)
2644{
2645 if (NULL != q->cq)
2646 {
2647 GMC_cancel (q->cq);
2648 /* tun_message_sent() will be called and free q */
2649 }
2650 else if (NULL != q->tqd)
2651 {
2652 unqueue_data (q->tqd);
2653 q->tqd = NULL;
2654 if (NULL != q->cont)
2655 q->cont (q->cont_cls, NULL, q, 0, 0);
2656 GNUNET_free (q);
2657 }
2658 else
2659 {
2660 GNUNET_break (0);
2661 }
2662}
2663
2664
2665/**
2666 * Sends an already built message on a tunnel, encrypting it and
2667 * choosing the best connection if not provided.
2668 *
2669 * @param message Message to send. Function modifies it.
2670 * @param t Tunnel on which this message is transmitted.
2671 * @param c Connection to use (autoselect if NULL).
2672 * @param force Force the tunnel to take the message (buffer overfill).
2673 * @param cont Continuation to call once message is really sent.
2674 * @param cont_cls Closure for @c cont.
2675 *
2676 * @return Handle to cancel message. NULL if @c cont is NULL.
2677 */
2678struct CadetTunnel3Queue *
2679GMT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2680 struct CadetTunnel3 *t, struct CadetConnection *c,
2681 int force, GMT_sent cont, void *cont_cls)
2682{
2683 return send_prebuilt_message (message, t, c, force, cont, cont_cls, NULL);
2684}
2685
2686
2687/**
2688 * Is the tunnel directed towards the local peer?
2689 *
2690 * @param t Tunnel.
2691 *
2692 * @return #GNUNET_YES if it is loopback.
2693 */
2694int
2695GMT_is_loopback (const struct CadetTunnel3 *t)
2696{
2697 return (myid == GMP_get_short_id (t->peer));
2698}
2699
2700
2701/**
2702 * Is the tunnel this path already?
2703 *
2704 * @param t Tunnel.
2705 * @param p Path.
2706 *
2707 * @return #GNUNET_YES a connection uses this path.
2708 */
2709int
2710GMT_is_path_used (const struct CadetTunnel3 *t, const struct CadetPeerPath *p)
2711{
2712 struct CadetTConnection *iter;
2713
2714 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2715 if (GMC_get_path (iter->c) == p)
2716 return GNUNET_YES;
2717
2718 return GNUNET_NO;
2719}
2720
2721
2722/**
2723 * Get a cost of a path for a tunnel considering existing connections.
2724 *
2725 * @param t Tunnel.
2726 * @param path Candidate path.
2727 *
2728 * @return Cost of the path (path length + number of overlapping nodes)
2729 */
2730unsigned int
2731GMT_get_path_cost (const struct CadetTunnel3 *t,
2732 const struct CadetPeerPath *path)
2733{
2734 struct CadetTConnection *iter;
2735 const struct CadetPeerPath *aux;
2736 unsigned int overlap;
2737 unsigned int i;
2738 unsigned int j;
2739
2740 if (NULL == path)
2741 return 0;
2742
2743 overlap = 0;
2744 GNUNET_assert (NULL != t);
2745
2746 for (i = 0; i < path->length; i++)
2747 {
2748 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2749 {
2750 aux = GMC_get_path (iter->c);
2751 if (NULL == aux)
2752 continue;
2753
2754 for (j = 0; j < aux->length; j++)
2755 {
2756 if (path->peers[i] == aux->peers[j])
2757 {
2758 overlap++;
2759 break;
2760 }
2761 }
2762 }
2763 }
2764 return path->length + overlap;
2765}
2766
2767
2768/**
2769 * Get the static string for the peer this tunnel is directed.
2770 *
2771 * @param t Tunnel.
2772 *
2773 * @return Static string the destination peer's ID.
2774 */
2775const char *
2776GMT_2s (const struct CadetTunnel3 *t)
2777{
2778 if (NULL == t)
2779 return "(NULL)";
2780
2781 return GMP_2s (t->peer);
2782}
2783
2784
2785/******************************************************************************/
2786/***************************** INFO/DEBUG *******************************/
2787/******************************************************************************/
2788
2789
2790/**
2791 * Log all possible info about the tunnel state to stderr.
2792 *
2793 * @param t Tunnel to debug.
2794 */
2795void
2796GMT_debug (const struct CadetTunnel3 *t)
2797{
2798 struct CadetTChannel *iterch;
2799 struct CadetTConnection *iterc;
2800
2801 LOG (GNUNET_ERROR_TYPE_DEBUG, "TTT DEBUG TUNNEL TOWARDS %s\n", GMT_2s (t));
2802 LOG (GNUNET_ERROR_TYPE_DEBUG, "TTT cstate %s, estate %s\n",
2803 cstate2s (t->cstate), estate2s (t->estate));
2804 LOG (GNUNET_ERROR_TYPE_DEBUG, "TTT kx_ctx %p, rekey_task %u\n",
2805 t->kx_ctx, t->rekey_task);
2806 LOG (GNUNET_ERROR_TYPE_DEBUG, "TTT tq_head %p, tq_tail %p\n",
2807 t->tq_head, t->tq_tail);
2808 LOG (GNUNET_ERROR_TYPE_DEBUG, "TTT destroy %u\n", t->destroy_task);
2809
2810 LOG (GNUNET_ERROR_TYPE_DEBUG, "TTT channels:\n");
2811 for (iterch = t->channel_head; NULL != iterch; iterch = iterch->next)
2812 {
2813 LOG (GNUNET_ERROR_TYPE_DEBUG, "TTT - %s\n", GMCH_2s (iterch->ch));
2814 }
2815
2816 LOG (GNUNET_ERROR_TYPE_DEBUG, "TTT connections:\n");
2817 for (iterc = t->connection_head; NULL != iterc; iterc = iterc->next)
2818 {
2819 LOG (GNUNET_ERROR_TYPE_DEBUG, "TTT - %s [%u] buf: %u/%u (qn %u/%u)\n",
2820 GMC_2s (iterc->c), GMC_get_state (iterc->c),
2821 GMC_get_buffer (iterc->c, GNUNET_YES),
2822 GMC_get_buffer (iterc->c, GNUNET_NO),
2823 GMC_get_qn (iterc->c, GNUNET_YES),
2824 GMC_get_qn (iterc->c, GNUNET_NO));
2825 }
2826
2827 LOG (GNUNET_ERROR_TYPE_DEBUG, "TTT DEBUG TUNNEL END\n");
2828}
2829
2830
2831/**
2832 * Iterate all tunnels.
2833 *
2834 * @param iter Iterator.
2835 * @param cls Closure for @c iter.
2836 */
2837void
2838GMT_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter, void *cls)
2839{
2840 GNUNET_CONTAINER_multipeermap_iterate (tunnels, iter, cls);
2841}
2842
2843
2844/**
2845 * Count all tunnels.
2846 *
2847 * @return Number of tunnels to remote peers kept by this peer.
2848 */
2849unsigned int
2850GMT_count_all (void)
2851{
2852 return GNUNET_CONTAINER_multipeermap_size (tunnels);
2853}
2854
2855
2856/**
2857 * Iterate all connections of a tunnel.
2858 *
2859 * @param t Tunnel whose connections to iterate.
2860 * @param iter Iterator.
2861 * @param cls Closure for @c iter.
2862 */
2863void
2864GMT_iterate_connections (struct CadetTunnel3 *t, GMT_conn_iter iter, void *cls)
2865{
2866 struct CadetTConnection *ct;
2867
2868 for (ct = t->connection_head; NULL != ct; ct = ct->next)
2869 iter (cls, ct->c);
2870}
2871
2872
2873/**
2874 * Iterate all channels of a tunnel.
2875 *
2876 * @param t Tunnel whose channels to iterate.
2877 * @param iter Iterator.
2878 * @param cls Closure for @c iter.
2879 */
2880void
2881GMT_iterate_channels (struct CadetTunnel3 *t, GMT_chan_iter iter, void *cls)
2882{
2883 struct CadetTChannel *cht;
2884
2885 for (cht = t->channel_head; NULL != cht; cht = cht->next)
2886 iter (cls, cht->ch);
2887}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-01 00:42:44 +0000