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authorChristian Grothoff <christian@grothoff.org>2017-03-11 12:53:18 +0100
committerChristian Grothoff <christian@grothoff.org>2017-03-11 12:53:18 +0100
commitbcf3298c5eb79dd98bfc8ccf58793703aac70f49 (patch)
tree2bc59b82d74596c65b3caab68f6102da516dfc46 /src/cadet/gnunet-service-cadet_channel.c
parentcd3d159df3150d46a6de7d39bcefb16f03ed5d3b (diff)
downloadgnunet-bcf3298c5eb79dd98bfc8ccf58793703aac70f49.tar.gz
gnunet-bcf3298c5eb79dd98bfc8ccf58793703aac70f49.zip
remove old CADET service code
Diffstat (limited to 'src/cadet/gnunet-service-cadet_channel.c')
-rw-r--r--src/cadet/gnunet-service-cadet_channel.c2562
1 files changed, 0 insertions, 2562 deletions
diff --git a/src/cadet/gnunet-service-cadet_channel.c b/src/cadet/gnunet-service-cadet_channel.c
deleted file mode 100644
index 7b7c6e57c..000000000
--- a/src/cadet/gnunet-service-cadet_channel.c
+++ /dev/null
@@ -1,2562 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013 GNUnet e.V.
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., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21
22#include "platform.h"
23#include "gnunet_util_lib.h"
24
25#include "gnunet_statistics_service.h"
26
27#include "cadet.h"
28#include "cadet_protocol.h"
29
30#include "gnunet-service-cadet_channel.h"
31#include "gnunet-service-cadet_local.h"
32#include "gnunet-service-cadet_tunnel.h"
33#include "gnunet-service-cadet_peer.h"
34
35#define LOG(level, ...) GNUNET_log_from(level,"cadet-chn",__VA_ARGS__)
36#define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-chn",__VA_ARGS__)
37
38#define CADET_RETRANSMIT_TIME GNUNET_TIME_relative_multiply(\
39 GNUNET_TIME_UNIT_MILLISECONDS, 250)
40#define CADET_RETRANSMIT_MARGIN 4
41
42
43/**
44 * All the states a connection can be in.
45 */
46enum CadetChannelState
47{
48 /**
49 * Uninitialized status, should never appear in operation.
50 */
51 CADET_CHANNEL_NEW,
52
53 /**
54 * Connection create message sent, waiting for ACK.
55 */
56 CADET_CHANNEL_SENT,
57
58 /**
59 * Connection confirmed, ready to carry traffic.
60 */
61 CADET_CHANNEL_READY
62};
63
64
65/**
66 * Info holder for channel messages in queues.
67 */
68struct CadetChannelQueue
69{
70 /**
71 * Tunnel Queue.
72 */
73 struct CadetTunnelQueue *tq;
74
75 /**
76 * Message type (DATA/DATA_ACK)
77 */
78 uint16_t type;
79
80 /**
81 * Message copy (for DATAs, to start retransmission timer)
82 */
83 struct CadetReliableMessage *copy;
84
85 /**
86 * Reliability (for DATA_ACKs, to access rel->ack_q)
87 */
88 struct CadetChannelReliability *rel;
89};
90
91
92/**
93 * Info needed to retry a message in case it gets lost.
94 */
95struct CadetReliableMessage
96{
97 /**
98 * Double linked list, FIFO style
99 */
100 struct CadetReliableMessage *next;
101 struct CadetReliableMessage *prev;
102
103 /**
104 * Type of message (payload, channel management).
105 */
106 int16_t type;
107
108 /**
109 * Tunnel Reliability queue this message is in.
110 */
111 struct CadetChannelReliability *rel;
112
113 /**
114 * ID of the message (ACK needed to free)
115 */
116 uint32_t mid;
117
118 /**
119 * Tunnel Queue.
120 */
121 struct CadetChannelQueue *chq;
122
123 /**
124 * When was this message issued (to calculate ACK delay)
125 */
126 struct GNUNET_TIME_Absolute timestamp;
127
128 /* struct GNUNET_CADET_ChannelAppDataMessage with payload */
129};
130
131
132/**
133 * Info about the traffic state for a client in a channel.
134 */
135struct CadetChannelReliability
136{
137 /**
138 * Channel this is about.
139 */
140 struct CadetChannel *ch;
141
142 /**
143 * DLL of messages sent and not yet ACK'd.
144 */
145 struct CadetReliableMessage *head_sent;
146 struct CadetReliableMessage *tail_sent;
147
148 /**
149 * DLL of messages received out of order.
150 */
151 struct CadetReliableMessage *head_recv;
152 struct CadetReliableMessage *tail_recv;
153
154 /**
155 * Messages received.
156 */
157 unsigned int n_recv;
158
159 /**
160 * Next MID to use for outgoing traffic.
161 */
162 uint32_t mid_send;
163
164 /**
165 * Next MID expected for incoming traffic.
166 */
167 uint32_t mid_recv;
168
169 /**
170 * Handle for queued unique data CREATE, DATA_ACK.
171 */
172 struct CadetChannelQueue *uniq;
173
174 /**
175 * Can we send data to the client?
176 */
177 int client_ready;
178
179 /**
180 * Can the client send data to us?
181 */
182 int client_allowed;
183
184 /**
185 * Task to resend/poll in case no ACK is received.
186 */
187 struct GNUNET_SCHEDULER_Task * retry_task;
188
189 /**
190 * Counter for exponential backoff.
191 */
192 struct GNUNET_TIME_Relative retry_timer;
193
194 /**
195 * How long does it usually take to get an ACK.
196 */
197 struct GNUNET_TIME_Relative expected_delay;
198};
199
200
201/**
202 * Struct containing all information regarding a channel to a remote client.
203 */
204struct CadetChannel
205{
206 /**
207 * Tunnel this channel is in.
208 */
209 struct CadetTunnel *t;
210
211 /**
212 * Destination port of the channel.
213 */
214 struct GNUNET_HashCode port;
215
216 /**
217 * Global channel number ( < GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
218 */
219 struct GNUNET_CADET_ChannelTunnelNumber gid;
220
221 /**
222 * Local tunnel number for root (owner) client.
223 * ( >= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI or 0 )
224 */
225 struct GNUNET_CADET_ClientChannelNumber lid_root;
226
227 /**
228 * Local tunnel number for local destination clients (incoming number)
229 * ( >= GNUNET_CADET_LOCAL_CHANNEL_ID_SERV or 0).
230 */
231 struct GNUNET_CADET_ClientChannelNumber lid_dest;
232
233 /**
234 * Channel state.
235 */
236 enum CadetChannelState state;
237
238 /**
239 * Is the tunnel bufferless (minimum latency)?
240 */
241 int nobuffer;
242
243 /**
244 * Is the tunnel reliable?
245 */
246 int reliable;
247
248 /**
249 * Last time the channel was used
250 */
251 struct GNUNET_TIME_Absolute timestamp;
252
253 /**
254 * Client owner of the tunnel, if any
255 */
256 struct CadetClient *root;
257
258 /**
259 * Client destination of the tunnel, if any.
260 */
261 struct CadetClient *dest;
262
263 /**
264 * Flag to signal the destruction of the channel.
265 * If this is set to #GNUNET_YES the channel will be destroyed
266 * when the queue is empty.
267 */
268 int destroy;
269
270 /**
271 * Total (reliable) messages pending ACK for this channel.
272 */
273 unsigned int pending_messages;
274
275 /**
276 * Reliability data.
277 * Only present (non-NULL) at the owner of a tunnel.
278 */
279 struct CadetChannelReliability *root_rel;
280
281 /**
282 * Reliability data.
283 * Only present (non-NULL) at the destination of a tunnel.
284 */
285 struct CadetChannelReliability *dest_rel;
286
287};
288
289
290/******************************************************************************/
291/******************************* GLOBALS ***********************************/
292/******************************************************************************/
293
294/**
295 * Global handle to the statistics service.
296 */
297extern struct GNUNET_STATISTICS_Handle *stats;
298
299/**
300 * Local peer own ID (memory efficient handle).
301 */
302extern GNUNET_PEER_Id myid;
303
304
305/******************************************************************************/
306/******************************** STATIC ***********************************/
307/******************************************************************************/
308
309
310/**
311 * Destroy a reliable message after it has been acknowledged, either by
312 * direct mid ACK or bitfield. Updates the appropriate data structures and
313 * timers and frees all memory.
314 *
315 * @param copy Message that is no longer needed: remote peer got it.
316 * @param update_time Is the timing information relevant?
317 * If this message is ACK in a batch the timing information
318 * is skewed by the retransmission, count only for the
319 * retransmitted message.
320 *
321 * @return #GNUNET_YES if channel was destroyed as a result of the call,
322 * #GNUNET_NO otherwise.
323 */
324static int
325rel_message_free (struct CadetReliableMessage *copy, int update_time);
326
327/**
328 * send a channel create message.
329 *
330 * @param ch Channel for which to send.
331 */
332static void
333send_create (struct CadetChannel *ch);
334
335/**
336 * Confirm we got a channel create, FWD ack.
337 *
338 * @param ch The channel to confirm.
339 * @param fwd Should we send a FWD ACK? (going dest->root)
340 */
341static void
342send_ack (struct CadetChannel *ch, int fwd);
343
344
345
346/**
347 * Test if the channel is loopback: both root and dest are on the local peer.
348 *
349 * @param ch Channel to test.
350 *
351 * @return #GNUNET_YES if channel is loopback, #GNUNET_NO otherwise.
352 */
353static int
354is_loopback (const struct CadetChannel *ch)
355{
356 if (NULL != ch->t)
357 return GCT_is_loopback (ch->t);
358
359 return (NULL != ch->root && NULL != ch->dest);
360}
361
362
363/**
364 * Save a copy of the data message for later retransmission.
365 *
366 * @param msg Message to copy.
367 * @param mid Message ID.
368 * @param rel Reliability data for retransmission.
369 */
370static struct CadetReliableMessage *
371copy_message (const struct GNUNET_CADET_ChannelAppDataMessage *msg, uint32_t mid,
372 struct CadetChannelReliability *rel)
373{
374 struct CadetReliableMessage *copy;
375 uint16_t size;
376
377 size = ntohs (msg->header.size);
378 copy = GNUNET_malloc (sizeof (*copy) + size);
379 copy->mid = mid;
380 copy->rel = rel;
381 copy->type = GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA;
382 GNUNET_memcpy (&copy[1], msg, size);
383
384 return copy;
385}
386
387/**
388 * We have received a message out of order, or the client is not ready.
389 * Buffer it until we receive an ACK from the client or the missing
390 * message from the channel.
391 *
392 * @param msg Message to buffer (MUST be of type CADET_DATA).
393 * @param rel Reliability data to the corresponding direction.
394 */
395static void
396add_buffered_data (const struct GNUNET_CADET_ChannelAppDataMessage *msg,
397 struct CadetChannelReliability *rel)
398{
399 struct CadetReliableMessage *copy;
400 struct CadetReliableMessage *prev;
401 uint32_t mid;
402
403 mid = ntohl (msg->mid);
404
405 LOG (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data MID %u (%u)\n",
406 mid, rel->n_recv);
407
408 rel->n_recv++;
409
410 // FIXME do something better than O(n), although n < 64...
411 // FIXME start from the end (most messages are the latest ones)
412 for (prev = rel->head_recv; NULL != prev; prev = prev->next)
413 {
414 LOG (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid);
415 if (prev->mid == mid)
416 {
417 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there!\n");
418 rel->n_recv--;
419 return;
420 }
421 else if (GC_is_pid_bigger (prev->mid, mid))
422 {
423 LOG (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n");
424 copy = copy_message (msg, mid, rel);
425 GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv,
426 prev, copy);
427 return;
428 }
429 }
430 copy = copy_message (msg, mid, rel);
431 LOG (GNUNET_ERROR_TYPE_DEBUG, " insert at tail! (now: %u)\n", rel->n_recv);
432 GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy);
433 LOG (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n");
434}
435
436
437/**
438 * Add a destination client to a channel, initializing all data structures
439 * in the channel and the client.
440 *
441 * @param ch Channel to which add the destination.
442 * @param c Client which to add to the channel.
443 */
444static void
445add_destination (struct CadetChannel *ch, struct CadetClient *c)
446{
447 if (NULL != ch->dest)
448 {
449 GNUNET_break (0);
450 return;
451 }
452
453 /* Assign local id as destination */
454 ch->lid_dest = GML_get_next_ccn (c);
455
456 /* Store in client's hashmap */
457 GML_channel_add (c, ch->lid_dest, ch);
458
459 GNUNET_break (NULL == ch->dest_rel);
460 ch->dest_rel = GNUNET_new (struct CadetChannelReliability);
461 ch->dest_rel->ch = ch;
462 ch->dest_rel->expected_delay.rel_value_us = 0;
463 ch->dest_rel->retry_timer = CADET_RETRANSMIT_TIME;
464
465 ch->dest = c;
466}
467
468
469/**
470 * Set options in a channel, extracted from a bit flag field.
471 *
472 * @param ch Channel to set options to.
473 * @param options Bit array in host byte order.
474 */
475static void
476channel_set_options (struct CadetChannel *ch, uint32_t options)
477{
478 ch->nobuffer = (options & GNUNET_CADET_OPTION_NOBUFFER) != 0 ?
479 GNUNET_YES : GNUNET_NO;
480 ch->reliable = (options & GNUNET_CADET_OPTION_RELIABLE) != 0 ?
481 GNUNET_YES : GNUNET_NO;
482}
483
484
485/**
486 * Get a bit flag field with the options of a channel.
487 *
488 * @param ch Channel to get options from.
489 *
490 * @return Bit array in host byte order.
491 */
492static uint32_t
493channel_get_options (struct CadetChannel *ch)
494{
495 uint32_t options;
496
497 options = 0;
498 if (ch->nobuffer)
499 options |= GNUNET_CADET_OPTION_NOBUFFER;
500 if (ch->reliable)
501 options |= GNUNET_CADET_OPTION_RELIABLE;
502
503 return options;
504}
505
506
507/**
508 * Notify a client that the channel is no longer valid.
509 *
510 * @param ch Channel that is destroyed.
511 * @param local_only Should we avoid sending it to other peers?
512 */
513static void
514send_destroy (struct CadetChannel *ch, int local_only)
515{
516 struct GNUNET_CADET_ChannelManageMessage msg;
517
518 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY);
519 msg.header.size = htons (sizeof (msg));
520 msg.ctn = ch->gid;
521
522 /* If root is not NULL, notify.
523 * If it's NULL, check lid_root. When a local destroy comes in, root
524 * is set to NULL but lid_root is left untouched. In this case, do nothing,
525 * the client is the one who requested the channel to be destroyed.
526 */
527 if (NULL != ch->root)
528 GML_send_channel_destroy (ch->root, ch->lid_root);
529 else if (0 == ch->lid_root.channel_of_client && GNUNET_NO == local_only)
530 GCCH_send_prebuilt_message (&msg.header, ch, GNUNET_NO, NULL);
531
532 if (NULL != ch->dest)
533 GML_send_channel_destroy (ch->dest, ch->lid_dest);
534 else if (0 == ch->lid_dest.channel_of_client && GNUNET_NO == local_only)
535 GCCH_send_prebuilt_message (&msg.header, ch, GNUNET_YES, NULL);
536}
537
538
539/**
540 * Notify the destination client that a new incoming channel was created.
541 *
542 * @param ch Channel that was created.
543 */
544static void
545send_client_create (struct CadetChannel *ch)
546{
547 uint32_t opt;
548
549 if (NULL == ch->dest)
550 return;
551
552 opt = 0;
553 opt |= GNUNET_YES == ch->reliable ? GNUNET_CADET_OPTION_RELIABLE : 0;
554 opt |= GNUNET_YES == ch->nobuffer ? GNUNET_CADET_OPTION_NOBUFFER : 0;
555 GML_send_channel_create (ch->dest,
556 ch->lid_dest,
557 &ch->port,
558 opt,
559 GCT_get_destination (ch->t));
560
561}
562
563
564/**
565 * Send data to a client.
566 *
567 * If the client is ready, send directly, otherwise buffer while listening
568 * for a local ACK.
569 *
570 * @param ch Channel
571 * @param msg Message.
572 * @param fwd Is this a fwd (root->dest) message?
573 */
574static void
575send_client_data (struct CadetChannel *ch,
576 const struct GNUNET_CADET_ChannelAppDataMessage *msg,
577 int fwd)
578{
579 if (fwd)
580 {
581 if (ch->dest_rel->client_ready)
582 {
583 GML_send_data (ch->dest, msg, ch->lid_dest);
584 ch->dest_rel->client_ready = GNUNET_NO;
585 ch->dest_rel->mid_recv++;
586 }
587 else
588 add_buffered_data (msg, ch->dest_rel);
589 }
590 else
591 {
592 if (ch->root_rel->client_ready)
593 {
594 GML_send_data (ch->root, msg, ch->lid_root);
595 ch->root_rel->client_ready = GNUNET_NO;
596 ch->root_rel->mid_recv++;
597 }
598 else
599 add_buffered_data (msg, ch->root_rel);
600 }
601}
602
603
604/**
605 * Send a buffered message to the client, for in order delivery or
606 * as result of client ACK.
607 *
608 * @param ch Channel on which to empty the message buffer.
609 * @param c Client to send to.
610 * @param fwd Is this to send FWD data?.
611 */
612static void
613send_client_buffered_data (struct CadetChannel *ch,
614 struct CadetClient *c,
615 int fwd)
616{
617 struct CadetReliableMessage *copy;
618 struct CadetChannelReliability *rel;
619
620 LOG (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n");
621 rel = fwd ? ch->dest_rel : ch->root_rel;
622 if (GNUNET_NO == rel->client_ready)
623 {
624 LOG (GNUNET_ERROR_TYPE_DEBUG, "client not ready\n");
625 return;
626 }
627
628 copy = rel->head_recv;
629 /* We never buffer channel management messages */
630 if (NULL != copy)
631 {
632 if (copy->mid == rel->mid_recv || GNUNET_NO == ch->reliable)
633 {
634 struct GNUNET_CADET_ChannelAppDataMessage *msg = (struct GNUNET_CADET_ChannelAppDataMessage *) &copy[1];
635
636 LOG (GNUNET_ERROR_TYPE_DEBUG, " have %u! now expecting %u\n",
637 copy->mid, rel->mid_recv + 1);
638 send_client_data (ch, msg, fwd);
639 rel->n_recv--;
640 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
641 LOG (GNUNET_ERROR_TYPE_DEBUG, " free copy recv MID %u (%p), %u left\n",
642 copy->mid, copy, rel->n_recv);
643 GNUNET_free (copy);
644 GCCH_send_data_ack (ch, fwd);
645 }
646 else
647 {
648 LOG (GNUNET_ERROR_TYPE_DEBUG, " reliable && don't have %u, next is %u\n",
649 rel->mid_recv, copy->mid);
650 if (GNUNET_YES == ch->destroy)
651 {
652 /* We don't have the next data piece and the remote peer has closed the
653 * channel. We won't receive it anymore, so just destroy the channel.
654 * FIXME: wait some time to allow other connections to
655 * deliver missing messages
656 */
657 send_destroy (ch, GNUNET_YES);
658 GCCH_destroy (ch);
659 }
660 }
661 }
662 LOG (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n");
663}
664
665
666/**
667 * Allow a client to send more data.
668 *
669 * In case the client was already allowed to send data, do nothing.
670 *
671 * @param ch Channel.
672 * @param fwd Is this a FWD ACK? (FWD ACKs are sent to root)
673 */
674static void
675send_client_ack (struct CadetChannel *ch, int fwd)
676{
677 struct CadetChannelReliability *rel = fwd ? ch->root_rel : ch->dest_rel;
678 struct CadetClient *c = fwd ? ch->root : ch->dest;
679
680 if (NULL == c)
681 {
682 GNUNET_break (GNUNET_NO != ch->destroy);
683 return;
684 }
685 LOG (GNUNET_ERROR_TYPE_DEBUG,
686 " sending %s ack to client on channel %s\n",
687 GC_f2s (fwd), GCCH_2s (ch));
688
689 if (NULL == rel)
690 {
691 GNUNET_break (0);
692 return;
693 }
694
695 if (GNUNET_YES == rel->client_allowed)
696 {
697 LOG (GNUNET_ERROR_TYPE_DEBUG, " already allowed\n");
698 return;
699 }
700 rel->client_allowed = GNUNET_YES;
701
702 GML_send_ack (c, fwd ? ch->lid_root : ch->lid_dest);
703}
704
705
706/**
707 * Notify the root that the destination rejected the channel.
708 *
709 * @param ch Rejected channel.
710 */
711static void
712send_client_nack (struct CadetChannel *ch)
713{
714 if (NULL == ch->root)
715 {
716 GNUNET_break (0);
717 return;
718 }
719 GML_send_channel_nack (ch->root, ch->lid_root);
720}
721
722
723/**
724 * We haven't received an ACK after a certain time: restransmit the message.
725 *
726 * @param cls Closure (CadetChannelReliability with the message to restransmit)
727 */
728static void
729channel_retransmit_message (void *cls)
730{
731 struct CadetChannelReliability *rel = cls;
732 struct CadetReliableMessage *copy;
733 struct CadetChannel *ch;
734 struct GNUNET_CADET_ChannelAppDataMessage *payload;
735 int fwd;
736
737 rel->retry_task = NULL;
738 ch = rel->ch;
739 copy = rel->head_sent;
740 if (NULL == copy)
741 {
742 GNUNET_break (0); // FIXME tripped in rps testcase
743 return;
744 }
745
746 payload = (struct GNUNET_CADET_ChannelAppDataMessage *) &copy[1];
747 fwd = (rel == ch->root_rel);
748
749 /* Message not found in the queue that we are going to use. */
750 LOG (GNUNET_ERROR_TYPE_DEBUG, "RETRANSMIT MID %u\n", copy->mid);
751
752 GCCH_send_prebuilt_message (&payload->header, ch, fwd, copy);
753 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
754}
755
756
757/**
758 * We haven't received an Channel ACK after a certain time: resend the CREATE.
759 *
760 * @param cls Closure (CadetChannelReliability of the channel to recreate)
761 */
762static void
763channel_recreate (void *cls)
764{
765 struct CadetChannelReliability *rel = cls;
766
767 rel->retry_task = NULL;
768 LOG (GNUNET_ERROR_TYPE_DEBUG, "RE-CREATE\n");
769 GNUNET_STATISTICS_update (stats,
770 "# data retransmitted", 1, GNUNET_NO);
771
772 if (rel == rel->ch->root_rel)
773 {
774 send_create (rel->ch);
775 }
776 else if (rel == rel->ch->dest_rel)
777 {
778 send_ack (rel->ch, GNUNET_YES);
779 }
780 else
781 {
782 GNUNET_break (0);
783 }
784}
785
786
787/**
788 * Message has been sent: start retransmission timer.
789 *
790 * @param cls Closure (queue structure).
791 * @param t Tunnel.
792 * @param q Queue handler (no longer valid).
793 * @param type Type of message.
794 * @param size Size of the message.
795 */
796static void
797ch_message_sent (void *cls,
798 struct CadetTunnel *t,
799 struct CadetTunnelQueue *q,
800 uint16_t type, size_t size)
801{
802 struct CadetChannelQueue *chq = cls;
803 struct CadetReliableMessage *copy = chq->copy;
804 struct CadetChannelReliability *rel;
805
806 LOG (GNUNET_ERROR_TYPE_DEBUG, "channel_message_sent callback %s\n",
807 GC_m2s (chq->type));
808
809 switch (chq->type)
810 {
811 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA:
812 LOG (GNUNET_ERROR_TYPE_DEBUG, "data MID %u sent\n", copy->mid);
813 GNUNET_assert (chq == copy->chq);
814 copy->timestamp = GNUNET_TIME_absolute_get ();
815 rel = copy->rel;
816 if (NULL == rel->retry_task)
817 {
818 LOG (GNUNET_ERROR_TYPE_DEBUG, " scheduling retry in %d * %s\n",
819 CADET_RETRANSMIT_MARGIN,
820 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
821 GNUNET_YES));
822 if (0 != rel->expected_delay.rel_value_us)
823 {
824 rel->retry_timer =
825 GNUNET_TIME_relative_saturating_multiply (rel->expected_delay,
826 CADET_RETRANSMIT_MARGIN);
827 }
828 else
829 {
830 rel->retry_timer = CADET_RETRANSMIT_TIME;
831 }
832 LOG (GNUNET_ERROR_TYPE_DEBUG, " using delay %s\n",
833 GNUNET_STRINGS_relative_time_to_string (rel->retry_timer,
834 GNUNET_NO));
835 rel->retry_task =
836 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
837 &channel_retransmit_message, rel);
838 }
839 else
840 {
841 LOG (GNUNET_ERROR_TYPE_DEBUG, "retry running %p\n", rel->retry_task);
842 }
843 copy->chq = NULL;
844 break;
845
846
847 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK:
848 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN:
849 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK:
850 LOG (GNUNET_ERROR_TYPE_DEBUG, "sent %s\n", GC_m2s (chq->type));
851 rel = chq->rel;
852 GNUNET_assert (rel->uniq == chq);
853 rel->uniq = NULL;
854
855 if (CADET_CHANNEL_READY != rel->ch->state
856 && GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK != type
857 && GNUNET_NO == rel->ch->destroy)
858 {
859 GNUNET_assert (NULL == rel->retry_task);
860 LOG (GNUNET_ERROR_TYPE_DEBUG, "STD BACKOFF %s\n",
861 GNUNET_STRINGS_relative_time_to_string (rel->retry_timer,
862 GNUNET_NO));
863 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
864 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
865 &channel_recreate, rel);
866 }
867 break;
868
869 default:
870 GNUNET_break (0);
871 }
872
873 GNUNET_free (chq);
874}
875
876
877/**
878 * send a channel create message.
879 *
880 * @param ch Channel for which to send.
881 */
882static void
883send_create (struct CadetChannel *ch)
884{
885 struct GNUNET_CADET_ChannelOpenMessage msgcc;
886
887 msgcc.header.size = htons (sizeof (msgcc));
888 msgcc.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN);
889 msgcc.ctn = ch->gid;
890 msgcc.port = ch->port;
891 msgcc.opt = htonl (channel_get_options (ch));
892
893 GCCH_send_prebuilt_message (&msgcc.header, ch, GNUNET_YES, NULL);
894}
895
896
897/**
898 * Confirm we got a channel create or FWD ack.
899 *
900 * @param ch The channel to confirm.
901 * @param fwd Should we send a FWD ACK? (going dest->root)
902 */
903static void
904send_ack (struct CadetChannel *ch, int fwd)
905{
906 struct GNUNET_CADET_ChannelManageMessage msg;
907
908 msg.header.size = htons (sizeof (msg));
909 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK);
910 LOG (GNUNET_ERROR_TYPE_DEBUG,
911 " sending channel %s ack for channel %s\n",
912 GC_f2s (fwd), GCCH_2s (ch));
913
914 msg.ctn =ch->gid;
915 GCCH_send_prebuilt_message (&msg.header, ch, !fwd, NULL);
916}
917
918
919/**
920 * Send a message and don't keep any info about it: we won't need to cancel it
921 * or resend it.
922 *
923 * @param msg Header of the message to fire away.
924 * @param ch Channel on which the message should go.
925 * @param force Is this a forced (undroppable) message?
926 */
927static void
928fire_and_forget (const struct GNUNET_MessageHeader *msg,
929 struct CadetChannel *ch,
930 int force)
931{
932 GNUNET_break (NULL ==
933 GCT_send_prebuilt_message (msg, ch->t, NULL,
934 force, NULL, NULL));
935}
936
937
938/**
939 * Notify that a channel create didn't succeed.
940 *
941 * @param ch The channel to reject.
942 */
943static void
944send_nack (struct CadetChannel *ch)
945{
946 struct GNUNET_CADET_ChannelManageMessage msg;
947
948 msg.header.size = htons (sizeof (msg));
949 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_NACK_DEPRECATED);
950 LOG (GNUNET_ERROR_TYPE_DEBUG,
951 " sending channel NACK for channel %s\n",
952 GCCH_2s (ch));
953
954 msg.ctn = ch->gid;
955 GCCH_send_prebuilt_message (&msg.header, ch, GNUNET_NO, NULL);
956}
957
958
959/**
960 * Destroy all reliable messages queued for a channel,
961 * during a channel destruction.
962 * Frees the reliability structure itself.
963 *
964 * @param rel Reliability data for a channel.
965 */
966static void
967channel_rel_free_all (struct CadetChannelReliability *rel)
968{
969 struct CadetReliableMessage *copy;
970 struct CadetReliableMessage *next;
971
972 if (NULL == rel)
973 return;
974
975 for (copy = rel->head_recv; NULL != copy; copy = next)
976 {
977 next = copy->next;
978 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
979 LOG (GNUNET_ERROR_TYPE_DEBUG, " COPYFREE ALL RECV %p\n", copy);
980 GNUNET_break (NULL == copy->chq);
981 GNUNET_free (copy);
982 }
983 for (copy = rel->head_sent; NULL != copy; copy = next)
984 {
985 next = copy->next;
986 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
987 LOG (GNUNET_ERROR_TYPE_DEBUG, " COPYFREE ALL SEND %p\n", copy);
988 if (NULL != copy->chq)
989 {
990 if (NULL != copy->chq->tq)
991 {
992 GCT_cancel (copy->chq->tq);
993 /* ch_message_sent will free copy->q */
994 }
995 else
996 {
997 GNUNET_free (copy->chq);
998 GNUNET_break (0);
999 }
1000 }
1001 GNUNET_free (copy);
1002 }
1003 if (NULL != rel->uniq && NULL != rel->uniq->tq)
1004 {
1005 GCT_cancel (rel->uniq->tq);
1006 /* ch_message_sent is called freeing uniq */
1007 }
1008 if (NULL != rel->retry_task)
1009 {
1010 GNUNET_SCHEDULER_cancel (rel->retry_task);
1011 rel->retry_task = NULL;
1012 }
1013 GNUNET_free (rel);
1014}
1015
1016
1017/**
1018 * Mark future messages as ACK'd.
1019 *
1020 * @param rel Reliability data.
1021 * @param msg DataACK message with a bitfield of future ACK'd messages.
1022 *
1023 * @return How many messages have been freed.
1024 */
1025static unsigned int
1026channel_rel_free_sent (struct CadetChannelReliability *rel,
1027 const struct GNUNET_CADET_ChannelDataAckMessage *msg)
1028{
1029 struct CadetReliableMessage *copy;
1030 struct CadetReliableMessage *next;
1031 uint64_t bitfield;
1032 uint64_t mask;
1033 uint32_t mid;
1034 uint32_t target;
1035 unsigned int i;
1036 unsigned int r;
1037
1038 bitfield = msg->futures;
1039 mid = ntohl (msg->mid);
1040 LOG (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable %u %lX\n", mid, bitfield);
1041 LOG (GNUNET_ERROR_TYPE_DEBUG, " rel %p, head %p\n", rel, rel->head_sent);
1042 for (i = 0, r = 0, copy = rel->head_sent;
1043 i < 64 && NULL != copy && 0 != bitfield;
1044 i++)
1045 {
1046 LOG (GNUNET_ERROR_TYPE_DEBUG, " trying bit %u (mid %u)\n", i, mid + i + 1);
1047 mask = 0x1LL << i;
1048 if (0 == (bitfield & mask))
1049 continue;
1050
1051 LOG (GNUNET_ERROR_TYPE_DEBUG, " set!\n");
1052 /* Bit was set, clear the bit from the bitfield */
1053 bitfield &= ~mask;
1054
1055 /* The i-th bit was set. Do we have that copy? */
1056 /* Skip copies with mid < target */
1057 target = mid + i + 1;
1058 LOG (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target);
1059 while (NULL != copy && GC_is_pid_bigger (target, copy->mid))
1060 copy = copy->next;
1061
1062 /* Did we run out of copies? (previously freed, it's ok) */
1063 if (NULL == copy)
1064 {
1065 LOG (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n");
1066 return r;
1067 }
1068
1069 /* Did we overshoot the target? (previously freed, it's ok) */
1070 if (GC_is_pid_bigger (copy->mid, target))
1071 {
1072 LOG (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid);
1073 i += copy->mid - target - 1; /* MID: 90, t = 85, i += 4 (i++ later) */
1074 mask = (0x1LL << (i + 1)) - 1; /* Mask = i-th bit and all before */
1075 bitfield &= ~mask; /* Clear all bits up to MID - 1 */
1076 continue;
1077 }
1078
1079 /* Now copy->mid == target, free it */
1080 next = copy->next;
1081 GNUNET_break (GNUNET_YES != rel_message_free (copy, GNUNET_YES));
1082 r++;
1083 copy = next;
1084 }
1085 LOG (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n");
1086 return r;
1087}
1088
1089
1090/**
1091 * Destroy a reliable message after it has been acknowledged, either by
1092 * direct mid ACK or bitfield. Updates the appropriate data structures and
1093 * timers and frees all memory.
1094 *
1095 * @param copy Message that is no longer needed: remote peer got it.
1096 * @param update_time Is the timing information relevant?
1097 * If this message is ACK in a batch the timing information
1098 * is skewed by the retransmission, count only for the
1099 * retransmitted message.
1100 *
1101 * @return #GNUNET_YES if channel was destroyed as a result of the call,
1102 * #GNUNET_NO otherwise.
1103 */
1104static int
1105rel_message_free (struct CadetReliableMessage *copy, int update_time)
1106{
1107 struct CadetChannelReliability *rel;
1108 struct GNUNET_TIME_Relative time;
1109
1110 rel = copy->rel;
1111 LOG (GNUNET_ERROR_TYPE_DEBUG, "Freeing %u\n", copy->mid);
1112 if (GNUNET_YES == update_time)
1113 {
1114 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
1115 if (0 == rel->expected_delay.rel_value_us)
1116 rel->expected_delay = time;
1117 else
1118 {
1119 rel->expected_delay.rel_value_us *= 7;
1120 rel->expected_delay.rel_value_us += time.rel_value_us;
1121 rel->expected_delay.rel_value_us /= 8;
1122 }
1123 LOG (GNUNET_ERROR_TYPE_DEBUG, " message time %12s\n",
1124 GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO));
1125 LOG (GNUNET_ERROR_TYPE_DEBUG, " new delay %12s\n",
1126 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
1127 GNUNET_NO));
1128 rel->retry_timer = rel->expected_delay;
1129 }
1130 else
1131 {
1132 LOG (GNUNET_ERROR_TYPE_DEBUG, "batch free, ignoring timing\n");
1133 }
1134 rel->ch->pending_messages--;
1135 if (NULL != copy->chq)
1136 {
1137 GCT_cancel (copy->chq->tq);
1138 /* copy->q is set to NULL by ch_message_sent */
1139 }
1140 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
1141 LOG (GNUNET_ERROR_TYPE_DEBUG, " free send copy MID %u at %p\n",
1142 copy->mid, copy);
1143 GNUNET_free (copy);
1144
1145 if (GNUNET_NO != rel->ch->destroy && 0 == rel->ch->pending_messages)
1146 {
1147 GCCH_destroy (rel->ch);
1148 return GNUNET_YES;
1149 }
1150 return GNUNET_NO;
1151}
1152
1153
1154/**
1155 * Channel was ACK'd by remote peer, mark as ready and cancel retransmission.
1156 *
1157 * @param ch Channel to mark as ready.
1158 * @param fwd Was the ACK message a FWD ACK? (dest->root, SYNACK)
1159 */
1160static void
1161channel_confirm (struct CadetChannel *ch, int fwd)
1162{
1163 struct CadetChannelReliability *rel;
1164 enum CadetChannelState oldstate;
1165
1166 rel = fwd ? ch->root_rel : ch->dest_rel;
1167 if (NULL == rel)
1168 {
1169 GNUNET_break (GNUNET_NO != ch->destroy);
1170 return;
1171 }
1172 LOG (GNUNET_ERROR_TYPE_DEBUG, " channel confirm %s %s\n",
1173 GC_f2s (fwd), GCCH_2s (ch));
1174 oldstate = ch->state;
1175 ch->state = CADET_CHANNEL_READY;
1176
1177 if (CADET_CHANNEL_READY != oldstate || GNUNET_YES == is_loopback (ch))
1178 {
1179 rel->client_ready = GNUNET_YES;
1180 rel->expected_delay = rel->retry_timer;
1181 LOG (GNUNET_ERROR_TYPE_DEBUG, " confirm retry timer %s\n",
1182 GNUNET_STRINGS_relative_time_to_string (rel->retry_timer, GNUNET_NO));
1183 if (GCT_get_connections_buffer (ch->t) > 0 || GCT_is_loopback (ch->t))
1184 send_client_ack (ch, fwd);
1185
1186 if (NULL != rel->retry_task)
1187 {
1188 GNUNET_SCHEDULER_cancel (rel->retry_task);
1189 rel->retry_task = NULL;
1190 }
1191 else if (NULL != rel->uniq)
1192 {
1193 GCT_cancel (rel->uniq->tq);
1194 /* ch_message_sent will free and NULL uniq */
1195 }
1196 else if (GNUNET_NO == is_loopback (ch))
1197 {
1198 /* We SHOULD have been trying to retransmit this! */
1199 GNUNET_break (0);
1200 }
1201 }
1202
1203 /* In case of a FWD ACK (SYNACK) send a BCK ACK (ACK). */
1204 if (GNUNET_YES == fwd)
1205 send_ack (ch, GNUNET_NO);
1206}
1207
1208
1209/**
1210 * Save a copy to retransmit in case it gets lost.
1211 *
1212 * Initializes all needed callbacks and timers.
1213 *
1214 * @param ch Channel this message goes on.
1215 * @param msg Message to copy.
1216 * @param fwd Is this fwd traffic?
1217 */
1218static struct CadetReliableMessage *
1219channel_save_copy (struct CadetChannel *ch,
1220 const struct GNUNET_MessageHeader *msg,
1221 int fwd)
1222{
1223 struct CadetChannelReliability *rel;
1224 struct CadetReliableMessage *copy;
1225 uint32_t mid;
1226 uint16_t type;
1227 uint16_t size;
1228
1229 rel = fwd ? ch->root_rel : ch->dest_rel;
1230 mid = rel->mid_send - 1;
1231 type = ntohs (msg->type);
1232 size = ntohs (msg->size);
1233
1234 LOG (GNUNET_ERROR_TYPE_DEBUG, "save MID %u %s\n", mid, GC_m2s (type));
1235 copy = GNUNET_malloc (sizeof (struct CadetReliableMessage) + size);
1236 LOG (GNUNET_ERROR_TYPE_DEBUG, " at %p\n", copy);
1237 copy->mid = mid;
1238 copy->rel = rel;
1239 copy->type = type;
1240 GNUNET_memcpy (&copy[1], msg, size);
1241 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
1242 ch->pending_messages++;
1243
1244 return copy;
1245}
1246
1247
1248/**
1249 * Create a new channel.
1250 *
1251 * @param t Tunnel this channel is in.
1252 * @param owner Client that owns the channel, NULL for foreign channels.
1253 * @param lid_root Local ID for root client.
1254 *
1255 * @return A new initialized channel. NULL on error.
1256 */
1257static struct CadetChannel *
1258channel_new (struct CadetTunnel *t,
1259 struct CadetClient *owner,
1260 struct GNUNET_CADET_ClientChannelNumber lid_root)
1261{
1262 struct CadetChannel *ch;
1263
1264 ch = GNUNET_new (struct CadetChannel);
1265 ch->root = owner;
1266 ch->lid_root = lid_root;
1267 ch->t = t;
1268
1269 GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
1270
1271 if (NULL != owner)
1272 {
1273 ch->gid = GCT_get_next_ctn (t);
1274 GML_channel_add (owner, lid_root, ch);
1275 }
1276 GCT_add_channel (t, ch);
1277
1278 return ch;
1279}
1280
1281
1282/**
1283 * Handle a loopback message: call the appropriate handler for the message type.
1284 *
1285 * @param ch Channel this message is on.
1286 * @param msgh Message header.
1287 * @param fwd Is this FWD traffic?
1288 */
1289void
1290handle_loopback (struct CadetChannel *ch,
1291 const struct GNUNET_MessageHeader *msgh,
1292 int fwd)
1293{
1294 uint16_t type;
1295
1296 type = ntohs (msgh->type);
1297 LOG (GNUNET_ERROR_TYPE_DEBUG,
1298 "Loopback %s %s message!\n",
1299 GC_f2s (fwd), GC_m2s (type));
1300
1301 switch (type)
1302 {
1303 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA:
1304 /* Don't send hop ACK, wait for client to ACK */
1305 LOG (GNUNET_ERROR_TYPE_DEBUG, "SEND loopback %u (%u)\n",
1306 ntohl (((struct GNUNET_CADET_ChannelAppDataMessage *) msgh)->mid), ntohs (msgh->size));
1307 GCCH_handle_data (ch, (struct GNUNET_CADET_ChannelAppDataMessage *) msgh, fwd);
1308 break;
1309
1310 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK:
1311 GCCH_handle_data_ack (ch,
1312 (const struct GNUNET_CADET_ChannelDataAckMessage *) msgh, fwd);
1313 break;
1314
1315 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN:
1316 GCCH_handle_create (ch->t,
1317 (const struct GNUNET_CADET_ChannelOpenMessage *) msgh);
1318 break;
1319
1320 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK:
1321 GCCH_handle_ack (ch,
1322 (const struct GNUNET_CADET_ChannelManageMessage *) msgh,
1323 fwd);
1324 break;
1325
1326 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_NACK_DEPRECATED:
1327 GCCH_handle_nack (ch);
1328 break;
1329
1330 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1331 GCCH_handle_destroy (ch,
1332 (const struct GNUNET_CADET_ChannelManageMessage *) msgh,
1333 fwd);
1334 break;
1335
1336 default:
1337 GNUNET_break_op (0);
1338 LOG (GNUNET_ERROR_TYPE_DEBUG,
1339 "end-to-end message not known (%u)\n",
1340 ntohs (msgh->type));
1341 }
1342}
1343
1344
1345
1346/******************************************************************************/
1347/******************************** API ***********************************/
1348/******************************************************************************/
1349
1350/**
1351 * Destroy a channel and free all resources.
1352 *
1353 * @param ch Channel to destroy.
1354 */
1355void
1356GCCH_destroy (struct CadetChannel *ch)
1357{
1358 struct CadetClient *c;
1359 struct CadetTunnel *t;
1360
1361 if (NULL == ch)
1362 return;
1363 if (2 == ch->destroy)
1364 return; /* recursive call */
1365 ch->destroy = 2;
1366
1367 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying channel %s:%u\n",
1368 GCT_2s (ch->t), ch->gid);
1369 GCCH_debug (ch, GNUNET_ERROR_TYPE_DEBUG);
1370
1371 c = ch->root;
1372 if (NULL != c)
1373 {
1374 GML_channel_remove (c, ch->lid_root, ch);
1375 }
1376
1377 c = ch->dest;
1378 if (NULL != c)
1379 {
1380 GML_channel_remove (c, ch->lid_dest, ch);
1381 }
1382
1383 channel_rel_free_all (ch->root_rel);
1384 channel_rel_free_all (ch->dest_rel);
1385
1386 t = ch->t;
1387 GCT_remove_channel (t, ch);
1388 GNUNET_STATISTICS_update (stats, "# channels", -1, GNUNET_NO);
1389
1390 GNUNET_free (ch);
1391 GCT_destroy_if_empty (t);
1392}
1393
1394
1395/**
1396 * Get the channel's public ID.
1397 *
1398 * @param ch Channel.
1399 *
1400 * @return ID used to identify the channel with the remote peer.
1401 */
1402struct GNUNET_CADET_ChannelTunnelNumber
1403GCCH_get_id (const struct CadetChannel *ch)
1404{
1405 return ch->gid;
1406}
1407
1408
1409/**
1410 * Get the channel tunnel.
1411 *
1412 * @param ch Channel to get the tunnel from.
1413 *
1414 * @return tunnel of the channel.
1415 */
1416struct CadetTunnel *
1417GCCH_get_tunnel (const struct CadetChannel *ch)
1418{
1419 return ch->t;
1420}
1421
1422
1423/**
1424 * Get free buffer space towards the client on a specific channel.
1425 *
1426 * @param ch Channel.
1427 * @param fwd Is query about FWD traffic?
1428 *
1429 * @return Free buffer space [0 - 64]
1430 */
1431unsigned int
1432GCCH_get_buffer (struct CadetChannel *ch, int fwd)
1433{
1434 struct CadetChannelReliability *rel;
1435
1436 rel = fwd ? ch->dest_rel : ch->root_rel;
1437 LOG (GNUNET_ERROR_TYPE_DEBUG, " get buffer, channel %s\n", GCCH_2s (ch));
1438 GCCH_debug (ch, GNUNET_ERROR_TYPE_DEBUG);
1439 /* If rel is NULL it means that the end is not yet created,
1440 * most probably is a loopback channel at the point of sending
1441 * the ChannelCreate to itself.
1442 */
1443 if (NULL == rel)
1444 {
1445 LOG (GNUNET_ERROR_TYPE_DEBUG, " rel is NULL: max\n");
1446 return 64;
1447 }
1448
1449 LOG (GNUNET_ERROR_TYPE_DEBUG, " n_recv %d\n", rel->n_recv);
1450 return (64 - rel->n_recv);
1451}
1452
1453
1454/**
1455 * Get flow control status of end point: is client allow to send?
1456 *
1457 * @param ch Channel.
1458 * @param fwd Is query about FWD traffic? (Request root status).
1459 *
1460 * @return #GNUNET_YES if client is allowed to send us data.
1461 */
1462int
1463GCCH_get_allowed (struct CadetChannel *ch, int fwd)
1464{
1465 struct CadetChannelReliability *rel;
1466
1467 rel = fwd ? ch->root_rel : ch->dest_rel;
1468
1469 if (NULL == rel)
1470 {
1471 /* Probably shutting down: root/dest NULL'ed to mark disconnection */
1472 GNUNET_break (GNUNET_NO != ch->destroy);
1473 return 0;
1474 }
1475
1476 return rel->client_allowed;
1477}
1478
1479
1480/**
1481 * Is the root client for this channel on this peer?
1482 *
1483 * @param ch Channel.
1484 * @param fwd Is this for fwd traffic?
1485 *
1486 * @return #GNUNET_YES in case it is.
1487 */
1488int
1489GCCH_is_origin (struct CadetChannel *ch, int fwd)
1490{
1491 struct CadetClient *c;
1492
1493 c = fwd ? ch->root : ch->dest;
1494 return NULL != c;
1495}
1496
1497
1498/**
1499 * Is the destination client for this channel on this peer?
1500 *
1501 * @param ch Channel.
1502 * @param fwd Is this for fwd traffic?
1503 *
1504 * @return #GNUNET_YES in case it is.
1505 */
1506int
1507GCCH_is_terminal (struct CadetChannel *ch, int fwd)
1508{
1509 struct CadetClient *c;
1510
1511 c = fwd ? ch->dest : ch->root;
1512 return NULL != c;
1513}
1514
1515
1516/**
1517 * Send an end-to-end ACK message for the most recent in-sequence payload.
1518 *
1519 * If channel is not reliable, do nothing.
1520 *
1521 * @param ch Channel this is about.
1522 * @param fwd Is for FWD traffic? (ACK dest->owner)
1523 */
1524void
1525GCCH_send_data_ack (struct CadetChannel *ch, int fwd)
1526{
1527 struct GNUNET_CADET_ChannelDataAckMessage msg;
1528 struct CadetChannelReliability *rel;
1529 struct CadetReliableMessage *copy;
1530 unsigned int delta;
1531 uint64_t mask;
1532 uint32_t ack;
1533
1534 if (GNUNET_NO == ch->reliable)
1535 return;
1536
1537 rel = fwd ? ch->dest_rel : ch->root_rel;
1538 ack = rel->mid_recv - 1;
1539
1540 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK);
1541 msg.header.size = htons (sizeof (msg));
1542 msg.ctn = ch->gid;
1543 msg.mid = htonl (ack);
1544
1545 msg.futures = 0LL;
1546 for (copy = rel->head_recv; NULL != copy; copy = copy->next)
1547 {
1548 if (copy->type != GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA)
1549 {
1550 LOG (GNUNET_ERROR_TYPE_DEBUG, " Type %s, expected DATA\n",
1551 GC_m2s (copy->type));
1552 continue;
1553 }
1554 GNUNET_assert (GC_is_pid_bigger(copy->mid, ack));
1555 delta = copy->mid - (ack + 1);
1556 if (63 < delta)
1557 break;
1558 mask = 0x1LL << delta;
1559 msg.futures |= mask;
1560 LOG (GNUNET_ERROR_TYPE_DEBUG,
1561 " setting bit for %u (delta %u) (%lX) -> %lX\n",
1562 copy->mid, delta, mask, msg.futures);
1563 }
1564
1565 GCCH_send_prebuilt_message (&msg.header, ch, !fwd, NULL);
1566 LOG (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n");
1567}
1568
1569
1570/**
1571 * Allow a client to send us more data, in case it was choked.
1572 *
1573 * @param ch Channel.
1574 * @param fwd Is this about FWD traffic? (Root client).
1575 */
1576void
1577GCCH_allow_client (struct CadetChannel *ch, int fwd)
1578{
1579 struct CadetChannelReliability *rel;
1580 unsigned int buffer;
1581
1582 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMCH allow\n");
1583
1584 if (CADET_CHANNEL_READY != ch->state)
1585 {
1586 LOG (GNUNET_ERROR_TYPE_DEBUG, " channel not ready yet!\n");
1587 return;
1588 }
1589
1590 if (GNUNET_YES == ch->reliable)
1591 {
1592 rel = fwd ? ch->root_rel : ch->dest_rel;
1593 if (NULL == rel)
1594 {
1595 GNUNET_break (GNUNET_NO != ch->destroy);
1596 return;
1597 }
1598 if (NULL != rel->head_sent)
1599 {
1600 if (64 <= rel->mid_send - rel->head_sent->mid)
1601 {
1602 LOG (GNUNET_ERROR_TYPE_DEBUG, " too big MID gap! Wait for ACK.\n");
1603 return;
1604 }
1605 else
1606 {
1607 LOG (GNUNET_ERROR_TYPE_DEBUG, " gap ok: %u - %u\n",
1608 rel->head_sent->mid, rel->mid_send);
1609 struct CadetReliableMessage *aux;
1610 for (aux = rel->head_sent; NULL != aux; aux = aux->next)
1611 {
1612 LOG (GNUNET_ERROR_TYPE_DEBUG, " - sent mid %u\n", aux->mid);
1613 }
1614 }
1615 }
1616 else
1617 {
1618 LOG (GNUNET_ERROR_TYPE_DEBUG, " head sent is NULL\n");
1619 }
1620 }
1621
1622 if (is_loopback (ch))
1623 buffer = GCCH_get_buffer (ch, fwd);
1624 else
1625 buffer = GCT_get_connections_buffer (ch->t);
1626
1627 if (0 == buffer)
1628 {
1629 LOG (GNUNET_ERROR_TYPE_DEBUG, " no buffer space.\n");
1630 return;
1631 }
1632
1633 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space %u, allowing\n", buffer);
1634 send_client_ack (ch, fwd);
1635}
1636
1637
1638/**
1639 * Log channel info.
1640 *
1641 * @param ch Channel.
1642 * @param level Debug level to use.
1643 */
1644void
1645GCCH_debug (struct CadetChannel *ch, enum GNUNET_ErrorType level)
1646{
1647 int do_log;
1648
1649 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
1650 "cadet-chn",
1651 __FILE__, __FUNCTION__, __LINE__);
1652 if (0 == do_log)
1653 return;
1654
1655 if (NULL == ch)
1656 {
1657 LOG2 (level, "CHN *** DEBUG NULL CHANNEL ***\n");
1658 return;
1659 }
1660 LOG2 (level, "CHN Channel %s:%X (%p)\n", GCT_2s (ch->t), ch->gid, ch);
1661 LOG2 (level, "CHN root %p/%p\n", ch->root, ch->root_rel);
1662 if (NULL != ch->root)
1663 {
1664 LOG2 (level, "CHN cli %s\n", GML_2s (ch->root));
1665 LOG2 (level, "CHN ready %s\n", ch->root_rel->client_ready ? "YES" : "NO");
1666 LOG2 (level, "CHN id %X\n", ch->lid_root.channel_of_client);
1667 LOG2 (level, "CHN recv %d\n", ch->root_rel->n_recv);
1668 LOG2 (level, "CHN MID r: %d, s: %d\n",
1669 ch->root_rel->mid_recv, ch->root_rel->mid_send);
1670 }
1671 LOG2 (level, "CHN dest %p/%p\n",
1672 ch->dest, ch->dest_rel);
1673 if (NULL != ch->dest)
1674 {
1675 LOG2 (level, "CHN cli %s\n", GML_2s (ch->dest));
1676 LOG2 (level, "CHN ready %s\n", ch->dest_rel->client_ready ? "YES" : "NO");
1677 LOG2 (level, "CHN id %X\n", ch->lid_dest);
1678 LOG2 (level, "CHN recv %d\n", ch->dest_rel->n_recv);
1679 LOG2 (level, "CHN MID r: %d, s: %d\n",
1680 ch->dest_rel->mid_recv, ch->dest_rel->mid_send);
1681
1682 }
1683}
1684
1685
1686/**
1687 * Handle an ACK given by a client.
1688 *
1689 * Mark client as ready and send him any buffered data we could have for him.
1690 *
1691 * @param ch Channel.
1692 * @param fwd Is this a "FWD ACK"? (FWD ACKs are sent by dest and go BCK)
1693 */
1694void
1695GCCH_handle_local_ack (struct CadetChannel *ch, int fwd)
1696{
1697 struct CadetChannelReliability *rel;
1698 struct CadetClient *c;
1699
1700 rel = fwd ? ch->dest_rel : ch->root_rel;
1701 c = fwd ? ch->dest : ch->root;
1702
1703 rel->client_ready = GNUNET_YES;
1704 send_client_buffered_data (ch, c, fwd);
1705
1706 if (GNUNET_YES == ch->destroy && 0 == rel->n_recv)
1707 {
1708 send_destroy (ch, GNUNET_YES);
1709 GCCH_destroy (ch);
1710 return;
1711 }
1712 /* if loopback is marked for destruction, no need to ACK to the other peer,
1713 * it requested the destruction and is already gone, therefore, else if.
1714 */
1715 else if (is_loopback (ch))
1716 {
1717 unsigned int buffer;
1718
1719 buffer = GCCH_get_buffer (ch, fwd);
1720 if (0 < buffer)
1721 GCCH_allow_client (ch, fwd);
1722
1723 return;
1724 }
1725 GCT_send_connection_acks (ch->t);
1726}
1727
1728
1729/**
1730 * Handle data given by a client.
1731 *
1732 * Check whether the client is allowed to send in this tunnel, save if channel
1733 * is reliable and send an ACK to the client if there is still buffer space
1734 * in the tunnel.
1735 *
1736 * @param ch Channel.
1737 * @param c Client which sent the data.
1738 * @param fwd Is this a FWD data?
1739 * @param message Data message.
1740 * @param size Size of data.
1741 *
1742 * @return #GNUNET_OK if everything goes well, #GNUNET_SYSERR in case of en error.
1743 */
1744int
1745GCCH_handle_local_data (struct CadetChannel *ch,
1746 struct CadetClient *c,
1747 int fwd,
1748 const struct GNUNET_MessageHeader *message,
1749 size_t size)
1750{
1751 struct CadetChannelReliability *rel;
1752 struct GNUNET_CADET_ChannelAppDataMessage *payload;
1753 uint16_t p2p_size = sizeof(struct GNUNET_CADET_ChannelAppDataMessage) + size;
1754 unsigned char cbuf[p2p_size];
1755 unsigned char buffer;
1756
1757 /* Is the client in the channel? */
1758 if ( !( (fwd &&
1759 ch->root == c)
1760 ||
1761 (!fwd &&
1762 ch->dest == c) ) )
1763 {
1764 GNUNET_break_op (0);
1765 return GNUNET_SYSERR;
1766 }
1767
1768 rel = fwd ? ch->root_rel : ch->dest_rel;
1769
1770 if (GNUNET_NO == rel->client_allowed)
1771 {
1772 GNUNET_break_op (0);
1773 return GNUNET_SYSERR;
1774 }
1775
1776 rel->client_allowed = GNUNET_NO;
1777
1778 /* Ok, everything is correct, send the message. */
1779 payload = (struct GNUNET_CADET_ChannelAppDataMessage *) cbuf;
1780 payload->mid = htonl (rel->mid_send);
1781 rel->mid_send++;
1782 GNUNET_memcpy (&payload[1], message, size);
1783 payload->header.size = htons (p2p_size);
1784 payload->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA);
1785 payload->ctn = ch->gid;
1786 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
1787 GCCH_send_prebuilt_message (&payload->header, ch, fwd, NULL);
1788
1789 if (is_loopback (ch))
1790 buffer = GCCH_get_buffer (ch, fwd);
1791 else
1792 buffer = GCT_get_connections_buffer (ch->t);
1793
1794 if (0 < buffer)
1795 GCCH_allow_client (ch, fwd);
1796
1797 return GNUNET_OK;
1798}
1799
1800
1801/**
1802 * Handle a channel destroy requested by a client.
1803 *
1804 * TODO: add "reason" field
1805 *
1806 * Destroy the channel and the tunnel in case this was the last channel.
1807 *
1808 * @param ch Channel.
1809 * @param c Client that requested the destruction (to avoid notifying him).
1810 * @param is_root Is the request coming from root?
1811 */
1812void
1813GCCH_handle_local_destroy (struct CadetChannel *ch,
1814 struct CadetClient *c,
1815 int is_root)
1816{
1817 ch->destroy = GNUNET_YES;
1818 /* Cleanup after the tunnel */
1819 if (GNUNET_NO == is_root && c == ch->dest)
1820 {
1821 LOG (GNUNET_ERROR_TYPE_DEBUG, " Client %s is destination.\n", GML_2s (c));
1822 GML_client_delete_channel (c, ch, ch->lid_dest);
1823 ch->dest = NULL;
1824 }
1825 if (GNUNET_YES == is_root && c == ch->root)
1826 {
1827 LOG (GNUNET_ERROR_TYPE_DEBUG, " Client %s is owner.\n", GML_2s (c));
1828 GML_client_delete_channel (c, ch, ch->lid_root);
1829 ch->root = NULL;
1830 }
1831
1832 send_destroy (ch, GNUNET_NO);
1833 if (0 == ch->pending_messages)
1834 GCCH_destroy (ch);
1835}
1836
1837
1838/**
1839 * Handle a channel create requested by a client.
1840 *
1841 * Create the channel and the tunnel in case this was the first0 channel.
1842 *
1843 * @param c Client that requested the creation (will be the root).
1844 * @param msg Create Channel message.
1845 *
1846 * @return #GNUNET_OK if everything went fine, #GNUNET_SYSERR otherwise.
1847 */
1848int
1849GCCH_handle_local_create (struct CadetClient *c,
1850 struct GNUNET_CADET_LocalChannelCreateMessage *msg)
1851{
1852 struct CadetChannel *ch;
1853 struct CadetTunnel *t;
1854 struct CadetPeer *peer;
1855 struct GNUNET_CADET_ClientChannelNumber ccn;
1856
1857 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n",
1858 GNUNET_i2s (&msg->peer), GNUNET_h2s (&msg->port));
1859 ccn = msg->ccn;
1860
1861 /* Sanity check for duplicate channel IDs */
1862 if (NULL != GML_channel_get (c, ccn))
1863 {
1864 GNUNET_break (0);
1865 return GNUNET_SYSERR;
1866 }
1867
1868 peer = GCP_get (&msg->peer, GNUNET_YES);
1869 GCP_add_tunnel (peer);
1870 t = GCP_get_tunnel (peer);
1871
1872 if (GCP_get_short_id (peer) == myid)
1873 {
1874 GCT_change_cstate (t, CADET_TUNNEL_READY);
1875 }
1876 else
1877 {
1878 /* FIXME change to a tunnel API, eliminate ch <-> peer connection */
1879 GCP_connect (peer);
1880 }
1881
1882 /* Create channel */
1883 ch = channel_new (t, c, ccn);
1884 if (NULL == ch)
1885 {
1886 GNUNET_break (0);
1887 return GNUNET_SYSERR;
1888 }
1889 ch->port = msg->port;
1890 channel_set_options (ch, ntohl (msg->opt));
1891
1892 /* In unreliable channels, we'll use the DLL to buffer BCK data */
1893 ch->root_rel = GNUNET_new (struct CadetChannelReliability);
1894 ch->root_rel->ch = ch;
1895 ch->root_rel->retry_timer = CADET_RETRANSMIT_TIME;
1896 ch->root_rel->expected_delay.rel_value_us = 0;
1897
1898 LOG (GNUNET_ERROR_TYPE_DEBUG, "CREATED CHANNEL %s\n", GCCH_2s (ch));
1899
1900 send_create (ch);
1901
1902 return GNUNET_OK;
1903}
1904
1905
1906/**
1907 * Handler for cadet network payload traffic.
1908 *
1909 * @param ch Channel for the message.
1910 * @param msg Unencryted data message.
1911 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1912 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1913 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1914 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1915 */
1916void
1917GCCH_handle_data (struct CadetChannel *ch,
1918 const struct GNUNET_CADET_ChannelAppDataMessage *msg,
1919 int fwd)
1920{
1921 struct CadetChannelReliability *rel;
1922 struct CadetClient *c;
1923 struct GNUNET_MessageHeader *payload_msg;
1924 uint32_t mid;
1925 uint16_t payload_type;
1926 uint16_t payload_size;
1927
1928 /* If this is a remote (non-loopback) channel, find 'fwd'. */
1929 if (GNUNET_SYSERR == fwd)
1930 {
1931 if (is_loopback (ch))
1932 {
1933 /* It is a loopback channel after all... */
1934 GNUNET_break (0);
1935 return;
1936 }
1937 fwd = (NULL != ch->dest) ? GNUNET_YES : GNUNET_NO;
1938 }
1939
1940 /* Initialize FWD/BCK data */
1941 c = fwd ? ch->dest : ch->root;
1942 rel = fwd ? ch->dest_rel : ch->root_rel;
1943
1944 if (NULL == c)
1945 {
1946 GNUNET_break (GNUNET_NO != ch->destroy);
1947 return;
1948 }
1949
1950 if (CADET_CHANNEL_READY != ch->state)
1951 {
1952 if (GNUNET_NO == fwd)
1953 {
1954 /* If we are the root, this means the other peer has sent traffic before
1955 * receiving our ACK. Even if the SYNACK goes missing, no traffic should
1956 * be sent before the ACK.
1957 */
1958 GNUNET_break_op (0);
1959 return;
1960 }
1961 /* If we are the dest, this means that the SYNACK got to the root but
1962 * the ACK went missing. Treat this as an ACK.
1963 */
1964 channel_confirm (ch, GNUNET_NO);
1965 }
1966
1967 payload_msg = (struct GNUNET_MessageHeader *) &msg[1];
1968 payload_type = ntohs (payload_msg->type);
1969 payload_size = ntohs (payload_msg->size);
1970
1971 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
1972 GNUNET_STATISTICS_update (stats, "# bytes received", payload_size, GNUNET_NO);
1973
1974 mid = ntohl (msg->mid);
1975 LOG (GNUNET_ERROR_TYPE_INFO, "<== %s (%s %4u) on chan %s (%p) %s [%5u]\n",
1976 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA), GC_m2s (payload_type), mid,
1977 GCCH_2s (ch), ch, GC_f2s (fwd), ntohs (msg->header.size));
1978
1979 if ( (GNUNET_NO == ch->reliable) ||
1980 ( (! GC_is_pid_bigger (rel->mid_recv, mid)) &&
1981 GC_is_pid_bigger (rel->mid_recv + 64, mid) ) )
1982 {
1983 if (GNUNET_YES == ch->reliable)
1984 {
1985 /* Is this the exact next expected messasge? */
1986 if (mid == rel->mid_recv)
1987 {
1988 LOG (GNUNET_ERROR_TYPE_DEBUG,
1989 "as expected, sending to client\n");
1990 send_client_data (ch, msg, fwd);
1991 }
1992 else
1993 {
1994 LOG (GNUNET_ERROR_TYPE_DEBUG,
1995 "save for later\n");
1996 add_buffered_data (msg, rel);
1997 }
1998 }
1999 else
2000 {
2001 /* Tunnel is unreliable: send to clients directly */
2002 /* FIXME: accept Out Of Order traffic */
2003 rel->mid_recv = mid + 1;
2004 send_client_data (ch, msg, fwd);
2005 }
2006 }
2007 else
2008 {
2009 GNUNET_STATISTICS_update (stats, "# duplicate MID", 1, GNUNET_NO);
2010 if (GC_is_pid_bigger (rel->mid_recv, mid))
2011 {
2012 GNUNET_break_op (0);
2013 LOG (GNUNET_ERROR_TYPE_WARNING,
2014 "MID %u on channel %s not expected (window: %u - %u). Dropping!\n",
2015 mid, GCCH_2s (ch), rel->mid_recv, rel->mid_recv + 63);
2016 }
2017 else
2018 {
2019 LOG (GNUNET_ERROR_TYPE_INFO,
2020 "Duplicate MID %u, channel %s (expecting MID %u). Re-sending ACK!\n",
2021 mid, GCCH_2s (ch), rel->mid_recv);
2022 if (NULL != rel->uniq)
2023 {
2024 LOG (GNUNET_ERROR_TYPE_WARNING,
2025 "We are trying to send an ACK, but don't seem have the "
2026 "bandwidth. Have you set enough [ats] QUOTA in your config?\n");
2027 }
2028
2029 }
2030 }
2031
2032 GCCH_send_data_ack (ch, fwd);
2033}
2034
2035
2036/**
2037 * Handler for cadet network traffic end-to-end ACKs.
2038 *
2039 * @param ch Channel on which we got this message.
2040 * @param msg Data message.
2041 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2042 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2043 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2044 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2045 */
2046void
2047GCCH_handle_data_ack (struct CadetChannel *ch,
2048 const struct GNUNET_CADET_ChannelDataAckMessage *msg,
2049 int fwd)
2050{
2051 struct CadetChannelReliability *rel;
2052 struct CadetReliableMessage *copy;
2053 struct CadetReliableMessage *next;
2054 uint32_t ack;
2055 int work;
2056
2057 /* If this is a remote (non-loopback) channel, find 'fwd'. */
2058 if (GNUNET_SYSERR == fwd)
2059 {
2060 if (is_loopback (ch))
2061 {
2062 /* It is a loopback channel after all... */
2063 GNUNET_break (0);
2064 return;
2065 }
2066 /* Inverted: if message came 'FWD' is a 'BCK ACK'. */
2067 fwd = (NULL != ch->dest) ? GNUNET_NO : GNUNET_YES;
2068 }
2069
2070 ack = ntohl (msg->mid);
2071 LOG (GNUNET_ERROR_TYPE_INFO,
2072 "<== %s (0x%010lX %4u) on chan %s (%p) %s [%5u]\n",
2073 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK), msg->futures, ack,
2074 GCCH_2s (ch), ch, GC_f2s (fwd), ntohs (msg->header.size));
2075
2076 if (GNUNET_YES == fwd)
2077 rel = ch->root_rel;
2078 else
2079 rel = ch->dest_rel;
2080
2081 if (NULL == rel)
2082 {
2083 GNUNET_break (GNUNET_NO != ch->destroy);
2084 return;
2085 }
2086
2087 /* Free ACK'd copies: no need to retransmit those anymore FIXME refactor */
2088 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
2089 {
2090 if (GC_is_pid_bigger (copy->mid, ack))
2091 {
2092 LOG (GNUNET_ERROR_TYPE_DEBUG, " head %u, out!\n", copy->mid);
2093 if (0 < channel_rel_free_sent (rel, msg))
2094 work = GNUNET_YES;
2095 break;
2096 }
2097 work = GNUNET_YES;
2098 LOG (GNUNET_ERROR_TYPE_DEBUG, " id %u\n", copy->mid);
2099 next = copy->next;
2100 if (GNUNET_YES == rel_message_free (copy, GNUNET_YES))
2101 {
2102 LOG (GNUNET_ERROR_TYPE_DEBUG, " channel destoyed\n");
2103 return;
2104 }
2105 }
2106
2107 /* ACK client if needed and possible */
2108 GCCH_allow_client (ch, fwd);
2109
2110 /* If some message was free'd, update the retransmission delay */
2111 if (GNUNET_YES == work)
2112 {
2113 if (NULL != rel->retry_task)
2114 {
2115 GNUNET_SCHEDULER_cancel (rel->retry_task);
2116 rel->retry_task = NULL;
2117 if (NULL != rel->head_sent && NULL == rel->head_sent->chq)
2118 {
2119 struct GNUNET_TIME_Absolute new_target;
2120 struct GNUNET_TIME_Relative delay;
2121
2122 delay = GNUNET_TIME_relative_saturating_multiply (rel->retry_timer,
2123 CADET_RETRANSMIT_MARGIN);
2124 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
2125 delay);
2126 delay = GNUNET_TIME_absolute_get_remaining (new_target);
2127 rel->retry_task =
2128 GNUNET_SCHEDULER_add_delayed (delay,
2129 &channel_retransmit_message,
2130 rel);
2131 }
2132 }
2133 else
2134 {
2135 /* Work was done but no task was pending.
2136 * Task was cancelled by a retransmission that is sitting in the queue.
2137 */
2138 // FIXME add test to make sure this is the case, probably add return
2139 // value to GCCH_send_prebuilt_message
2140 }
2141 }
2142}
2143
2144
2145/**
2146 * Handler for channel create messages.
2147 *
2148 * Does not have fwd parameter because it's always 'FWD': channel is incoming.
2149 *
2150 * @param t Tunnel this channel will be in.
2151 * @param msg Channel crate message.
2152 */
2153struct CadetChannel *
2154GCCH_handle_create (struct CadetTunnel *t,
2155 const struct GNUNET_CADET_ChannelOpenMessage *msg)
2156{
2157 struct GNUNET_CADET_ClientChannelNumber ccn;
2158 struct GNUNET_CADET_ChannelTunnelNumber gid;
2159 struct CadetChannel *ch;
2160 struct CadetClient *c;
2161 int new_channel;
2162 const struct GNUNET_HashCode *port;
2163
2164 gid = msg->ctn;
2165 ch = GCT_get_channel (t, gid);
2166 if (NULL == ch)
2167 {
2168 /* Create channel */
2169 ccn.channel_of_client = htonl (0);
2170 ch = channel_new (t, NULL, ccn);
2171 ch->gid = gid;
2172 channel_set_options (ch, ntohl (msg->opt));
2173 new_channel = GNUNET_YES;
2174 }
2175 else
2176 {
2177 new_channel = GNUNET_NO;
2178 }
2179 port = &msg->port;
2180
2181 LOG (GNUNET_ERROR_TYPE_INFO,
2182 "<== %s ( 0x%08X %4u) on chan %s (%p) %s [%5u]\n",
2183 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN), ccn, port,
2184 GCCH_2s (ch), ch, GC_f2s (GNUNET_YES), ntohs (msg->header.size));
2185
2186 if (GNUNET_YES == new_channel || GCT_is_loopback (t))
2187 {
2188 /* Find a destination client */
2189 ch->port = *port;
2190 LOG (GNUNET_ERROR_TYPE_DEBUG, " port %s\n", GNUNET_h2s (port));
2191 c = GML_client_get_by_port (port);
2192 if (NULL == c)
2193 {
2194 LOG (GNUNET_ERROR_TYPE_DEBUG, " no client has port registered\n");
2195 if (is_loopback (ch))
2196 {
2197 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback: destroy on handler\n");
2198 send_nack (ch);
2199 }
2200 else
2201 {
2202 LOG (GNUNET_ERROR_TYPE_DEBUG, " not loopback: destroy now\n");
2203 send_nack (ch);
2204 GCCH_destroy (ch);
2205 }
2206 return NULL;
2207 }
2208 else
2209 {
2210 LOG (GNUNET_ERROR_TYPE_DEBUG, " client %p has port registered\n", c);
2211 }
2212
2213 add_destination (ch, c);
2214 if (GNUNET_YES == ch->reliable)
2215 LOG (GNUNET_ERROR_TYPE_DEBUG, "Reliable\n");
2216 else
2217 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not Reliable\n");
2218
2219 send_client_create (ch);
2220 ch->state = CADET_CHANNEL_SENT;
2221 }
2222 else
2223 {
2224 LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate create channel\n");
2225 if (NULL != ch->dest_rel->retry_task)
2226 {
2227 LOG (GNUNET_ERROR_TYPE_DEBUG, " clearing retry task\n");
2228 /* we were waiting to re-send our 'SYNACK', wait no more! */
2229 GNUNET_SCHEDULER_cancel (ch->dest_rel->retry_task);
2230 ch->dest_rel->retry_task = NULL;
2231 }
2232 else if (NULL != ch->dest_rel->uniq)
2233 {
2234 /* we are waiting to for our 'SYNACK' to leave the queue, all done! */
2235 return ch;
2236 }
2237 }
2238 send_ack (ch, GNUNET_YES);
2239
2240 return ch;
2241}
2242
2243
2244/**
2245 * Handler for channel NACK messages.
2246 *
2247 * NACK messages always go dest -> root, no need for 'fwd' or 'msg' parameter.
2248 *
2249 * @param ch Channel.
2250 */
2251void
2252GCCH_handle_nack (struct CadetChannel *ch)
2253{
2254 LOG (GNUNET_ERROR_TYPE_INFO,
2255 "<== %s ( 0x%08X %4u) on chan %s (%p) %s [%5u]\n",
2256 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_NACK_DEPRECATED), ch->gid, 0,
2257 GCCH_2s (ch), ch, "---", 0);
2258
2259 send_client_nack (ch);
2260 GCCH_destroy (ch);
2261}
2262
2263
2264/**
2265 * Handler for channel ack messages.
2266 *
2267 * @param ch Channel.
2268 * @param msg Message.
2269 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2270 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2271 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2272 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2273 */
2274void
2275GCCH_handle_ack (struct CadetChannel *ch,
2276 const struct GNUNET_CADET_ChannelManageMessage *msg,
2277 int fwd)
2278{
2279 LOG (GNUNET_ERROR_TYPE_INFO,
2280 "<== %s ( 0x%08X %4u) on chan %s (%p) %s [%5u]\n",
2281 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK), ch->gid, 0,
2282 GCCH_2s (ch), ch, GC_f2s (fwd), ntohs (msg->header.size));
2283
2284 /* If this is a remote (non-loopback) channel, find 'fwd'. */
2285 if (GNUNET_SYSERR == fwd)
2286 {
2287 if (is_loopback (ch))
2288 {
2289 /* It is a loopback channel after all... */
2290 GNUNET_break (0);
2291 return;
2292 }
2293 fwd = (NULL != ch->dest) ? GNUNET_YES : GNUNET_NO;
2294 }
2295
2296 channel_confirm (ch, !fwd);
2297}
2298
2299
2300/**
2301 * Handler for channel destroy messages.
2302 *
2303 * @param ch Channel to be destroyed of.
2304 * @param msg Message.
2305 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2306 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2307 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2308 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2309 */
2310void
2311GCCH_handle_destroy (struct CadetChannel *ch,
2312 const struct GNUNET_CADET_ChannelManageMessage *msg,
2313 int fwd)
2314{
2315 struct CadetChannelReliability *rel;
2316
2317 LOG (GNUNET_ERROR_TYPE_INFO,
2318 "<== %s ( 0x%08X %4u) on chan %s (%p) %s [%5u]\n",
2319 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY), ch->gid, 0,
2320 GCCH_2s (ch), ch, GC_f2s (fwd), ntohs (msg->header.size));
2321
2322 /* If this is a remote (non-loopback) channel, find 'fwd'. */
2323 if (GNUNET_SYSERR == fwd)
2324 {
2325 if (is_loopback (ch))
2326 {
2327 /* It is a loopback channel after all... */
2328 GNUNET_break (0);
2329 return;
2330 }
2331 fwd = (NULL != ch->dest) ? GNUNET_YES : GNUNET_NO;
2332 }
2333
2334 GCCH_debug (ch, GNUNET_ERROR_TYPE_DEBUG);
2335 if ( (fwd && NULL == ch->dest) || (!fwd && NULL == ch->root) )
2336 {
2337 /* Not for us (don't destroy twice a half-open loopback channel) */
2338 return;
2339 }
2340
2341 rel = fwd ? ch->dest_rel : ch->root_rel;
2342 if (0 == rel->n_recv)
2343 {
2344 send_destroy (ch, GNUNET_YES);
2345 GCCH_destroy (ch);
2346 }
2347 else
2348 {
2349 ch->destroy = GNUNET_YES;
2350 }
2351}
2352
2353
2354/**
2355 * Sends an already built message on a channel.
2356 *
2357 * If the channel is on a loopback tunnel, notifies the appropriate destination
2358 * client locally.
2359 *
2360 * On a normal channel passes the message to the tunnel for encryption and
2361 * sending on a connection.
2362 *
2363 * This function DOES NOT save the message for retransmission.
2364 *
2365 * @param message Message to send. Function makes a copy of it.
2366 * @param ch Channel on which this message is transmitted.
2367 * @param fwd Is this a fwd message?
2368 * @param existing_copy This is a retransmission, don't save a copy.
2369 */
2370void
2371GCCH_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2372 struct CadetChannel *ch, int fwd,
2373 void *existing_copy)
2374{
2375 struct CadetChannelQueue *chq;
2376 uint32_t data_id;
2377 uint16_t type;
2378 uint16_t size;
2379 char info[32];
2380
2381 type = ntohs (message->type);
2382 size = ntohs (message->size);
2383
2384 data_id = 0;
2385 switch (type)
2386 {
2387 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA:
2388 {
2389 struct GNUNET_CADET_ChannelAppDataMessage *data_msg;
2390 struct GNUNET_MessageHeader *payload_msg;
2391 uint16_t payload_type;
2392
2393 data_msg = (struct GNUNET_CADET_ChannelAppDataMessage *) message;
2394 data_id = ntohl (data_msg->mid);
2395 payload_msg = (struct GNUNET_MessageHeader *) &data_msg[1];
2396 payload_type = ntohs (payload_msg->type);
2397 strncpy (info, GC_m2s (payload_type), 31);
2398 info[31] = '\0';
2399 break;
2400 }
2401 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK:
2402 {
2403 struct GNUNET_CADET_ChannelDataAckMessage *ack_msg;
2404 ack_msg = (struct GNUNET_CADET_ChannelDataAckMessage *) message;
2405 data_id = ntohl (ack_msg->mid);
2406 SPRINTF (info, "0x%010lX",
2407 (unsigned long int) ack_msg->futures);
2408 break;
2409 }
2410 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN:
2411 {
2412 struct GNUNET_CADET_ChannelOpenMessage *cc_msg;
2413 cc_msg = (struct GNUNET_CADET_ChannelOpenMessage *) message;
2414 SPRINTF (info, " 0x%08X", ntohl (cc_msg->ctn.cn));
2415 break;
2416 }
2417 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK:
2418 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_NACK_DEPRECATED:
2419 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
2420 {
2421 struct GNUNET_CADET_ChannelManageMessage *m_msg;
2422 m_msg = (struct GNUNET_CADET_ChannelManageMessage *) message;
2423 SPRINTF (info, " 0x%08X", ntohl (m_msg->ctn.cn));
2424 break;
2425 }
2426 default:
2427 info[0] = '\0';
2428 }
2429 LOG (GNUNET_ERROR_TYPE_INFO,
2430 "==> %s (%12s %4u) on chan %s (%p) %s [%5u]\n",
2431 GC_m2s (type), info, data_id,
2432 GCCH_2s (ch), ch, GC_f2s (fwd), size);
2433
2434 if (GCT_is_loopback (ch->t))
2435 {
2436 handle_loopback (ch, message, fwd);
2437 return;
2438 }
2439
2440 switch (type)
2441 {
2442 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA:
2443 if (GNUNET_YES == ch->reliable)
2444 {
2445 chq = GNUNET_new (struct CadetChannelQueue);
2446 chq->type = type;
2447 if (NULL == existing_copy)
2448 chq->copy = channel_save_copy (ch, message, fwd);
2449 else
2450 {
2451 chq->copy = (struct CadetReliableMessage *) existing_copy;
2452 if (NULL != chq->copy->chq)
2453 {
2454 /* Last retransmission was queued but not yet sent!
2455 * This retransmission was scheduled by a ch_message_sent which
2456 * followed a very fast RTT, so the tiny delay made the
2457 * retransmission function to execute before the previous
2458 * retransmitted message even had a chance to leave the peer.
2459 * Cancel this message and wait until the pending
2460 * retransmission leaves the peer and ch_message_sent starts
2461 * the timer for the next one.
2462 */
2463 GNUNET_free (chq);
2464 LOG (GNUNET_ERROR_TYPE_DEBUG,
2465 " exisitng copy not yet transmitted!\n");
2466 return;
2467 }
2468 LOG (GNUNET_ERROR_TYPE_DEBUG,
2469 " using existing copy: %p {r:%p q:%p t:%u}\n",
2470 existing_copy,
2471 chq->copy->rel, chq->copy->chq, chq->copy->type);
2472 }
2473 LOG (GNUNET_ERROR_TYPE_DEBUG, " new chq: %p\n", chq);
2474 chq->copy->chq = chq;
2475 chq->tq = GCT_send_prebuilt_message (message, ch->t, NULL,
2476 GNUNET_YES,
2477 &ch_message_sent, chq);
2478 /* q itself is stored in copy */
2479 GNUNET_assert (NULL != chq->tq || GNUNET_NO != ch->destroy);
2480 }
2481 else
2482 {
2483 fire_and_forget (message, ch, GNUNET_NO);
2484 }
2485 break;
2486
2487
2488 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK:
2489 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN:
2490 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK:
2491 chq = GNUNET_new (struct CadetChannelQueue);
2492 chq->type = type;
2493 chq->rel = fwd ? ch->root_rel : ch->dest_rel;
2494 if (NULL != chq->rel->uniq)
2495 {
2496 if (NULL != chq->rel->uniq->tq)
2497 {
2498 GCT_cancel (chq->rel->uniq->tq);
2499 /* ch_message_sent is called, freeing and NULLing uniq */
2500 GNUNET_break (NULL == chq->rel->uniq);
2501 }
2502 else
2503 {
2504 GNUNET_break (0);
2505 GNUNET_free (chq->rel->uniq);
2506 }
2507 }
2508
2509 chq->rel->uniq = chq;
2510 chq->tq = GCT_send_prebuilt_message (message, ch->t, NULL, GNUNET_YES,
2511 &ch_message_sent, chq);
2512 if (NULL == chq->tq)
2513 {
2514 GNUNET_break (0);
2515 chq->rel->uniq = NULL;
2516 GCT_debug (ch->t, GNUNET_ERROR_TYPE_ERROR);
2517 GNUNET_free (chq);
2518 chq = NULL;
2519 return;
2520 }
2521 break;
2522
2523
2524 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
2525 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_NACK_DEPRECATED:
2526 fire_and_forget (message, ch, GNUNET_YES);
2527 break;
2528
2529
2530 default:
2531 GNUNET_break (0);
2532 LOG (GNUNET_ERROR_TYPE_WARNING, "type %s unknown!\n", GC_m2s (type));
2533 fire_and_forget (message, ch, GNUNET_YES);
2534 }
2535}
2536
2537
2538/**
2539 * Get the static string for identification of the channel.
2540 *
2541 * @param ch Channel.
2542 *
2543 * @return Static string with the channel IDs.
2544 */
2545const char *
2546GCCH_2s (const struct CadetChannel *ch)
2547{
2548 static char buf[64];
2549
2550 if (NULL == ch)
2551 return "(NULL Channel)";
2552
2553 SPRINTF (buf,
2554 "%s:%s gid:%X (%X / %X)",
2555 GCT_2s (ch->t),
2556 GNUNET_h2s (&ch->port),
2557 ntohl (ch->gid.cn),
2558 ntohl (ch->lid_root.channel_of_client),
2559 ntohl (ch->lid_dest.channel_of_client));
2560
2561 return buf;
2562}
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-23 18:48:31 +0000