2 This file is part of GNUnet.
3 (C) 2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
23 #include "gnunet_util_lib.h"
25 #include "gnunet_statistics_service.h"
28 #include "mesh_protocol.h"
30 #include "gnunet-service-mesh_channel.h"
31 #include "gnunet-service-mesh_local.h"
32 #include "gnunet-service-mesh_tunnel.h"
33 #include "gnunet-service-mesh_peer.h"
35 #define LOG(level, ...) GNUNET_log_from(level,"mesh-chn",__VA_ARGS__)
37 #define MESH_RETRANSMIT_TIME GNUNET_TIME_UNIT_SECONDS
38 #define MESH_RETRANSMIT_MARGIN 4
42 * All the states a connection can be in.
47 * Uninitialized status, should never appear in operation.
52 * Connection create message sent, waiting for ACK.
57 * Connection confirmed, ready to carry traffic.
64 * Info holder for channel messages in queues.
66 struct MeshChannelQueue
71 struct MeshTunnel3Queue *q;
74 * Message type (DATA/DATA_ACK)
79 * Message copy (for DATAs, to start retransmission timer)
81 struct MeshReliableMessage *copy;
84 * Reliability (for DATA_ACKs, to access rel->ack_q)
86 struct MeshChannelReliability *rel;
91 * Info needed to retry a message in case it gets lost.
93 struct MeshReliableMessage
96 * Double linked list, FIFO style
98 struct MeshReliableMessage *next;
99 struct MeshReliableMessage *prev;
102 * Type of message (payload, channel management).
107 * Tunnel Reliability queue this message is in.
109 struct MeshChannelReliability *rel;
112 * ID of the message (ACK needed to free)
119 struct MeshChannelQueue *q;
122 * When was this message issued (to calculate ACK delay)
124 struct GNUNET_TIME_Absolute timestamp;
126 /* struct GNUNET_MESH_Data with payload */
131 * Info about the traffic state for a client in a channel.
133 struct MeshChannelReliability
136 * Channel this is about.
138 struct MeshChannel *ch;
141 * DLL of messages sent and not yet ACK'd.
143 struct MeshReliableMessage *head_sent;
144 struct MeshReliableMessage *tail_sent;
147 * DLL of messages received out of order.
149 struct MeshReliableMessage *head_recv;
150 struct MeshReliableMessage *tail_recv;
158 * Next MID to use for outgoing traffic.
163 * Next MID expected for incoming traffic.
168 * Handle for queued unique data CREATE, DATA_ACK.
170 struct MeshChannelQueue *uniq;
173 * Can we send data to the client?
178 * Can the client send data to us?
183 * Task to resend/poll in case no ACK is received.
185 GNUNET_SCHEDULER_TaskIdentifier retry_task;
188 * Counter for exponential backoff.
190 struct GNUNET_TIME_Relative retry_timer;
193 * How long does it usually take to get an ACK.
195 struct GNUNET_TIME_Relative expected_delay;
200 * Struct containing all information regarding a channel to a remote client.
205 * Tunnel this channel is in.
207 struct MeshTunnel3 *t;
210 * Destination port of the channel.
215 * Global channel number ( < GNUNET_MESH_LOCAL_CHANNEL_ID_CLI)
217 MESH_ChannelNumber gid;
220 * Local tunnel number for root (owner) client.
221 * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_CLI or 0 )
223 MESH_ChannelNumber lid_root;
226 * Local tunnel number for local destination clients (incoming number)
227 * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV or 0).
229 MESH_ChannelNumber lid_dest;
234 enum MeshChannelState state;
237 * Is the tunnel bufferless (minimum latency)?
242 * Is the tunnel reliable?
247 * Last time the channel was used
249 struct GNUNET_TIME_Absolute timestamp;
252 * Client owner of the tunnel, if any
254 struct MeshClient *root;
257 * Client destination of the tunnel, if any.
259 struct MeshClient *dest;
262 * Flag to signal the destruction of the channel.
263 * If this is set GNUNET_YES the channel will be destroyed
264 * when the queue is empty.
269 * Total (reliable) messages pending ACK for this channel.
271 unsigned int pending_messages;
275 * Only present (non-NULL) at the owner of a tunnel.
277 struct MeshChannelReliability *root_rel;
281 * Only present (non-NULL) at the destination of a tunnel.
283 struct MeshChannelReliability *dest_rel;
288 /******************************************************************************/
289 /******************************* GLOBALS ***********************************/
290 /******************************************************************************/
293 * Global handle to the statistics service.
295 extern struct GNUNET_STATISTICS_Handle *stats;
298 * Local peer own ID (memory efficient handle).
300 extern GNUNET_PEER_Id myid;
303 /******************************************************************************/
304 /******************************** STATIC ***********************************/
305 /******************************************************************************/
308 * Destroy a reliable message after it has been acknowledged, either by
309 * direct mid ACK or bitfield. Updates the appropriate data structures and
310 * timers and frees all memory.
312 * @param copy Message that is no longer needed: remote peer got it.
313 * @param update_time Is the timing information relevant?
314 * If this message is ACK in a batch the timing information
315 * is skewed by the retransmission, count only for the
316 * retransmitted message.
319 rel_message_free (struct MeshReliableMessage *copy, int update_time);
322 * send a channel create message.
324 * @param ch Channel for which to send.
327 send_create (struct MeshChannel *ch);
332 * We have received a message out of order, or the client is not ready.
333 * Buffer it until we receive an ACK from the client or the missing
334 * message from the channel.
336 * @param msg Message to buffer (MUST be of type MESH_DATA).
337 * @param rel Reliability data to the corresponding direction.
340 add_buffered_data (const struct GNUNET_MESH_Data *msg,
341 struct MeshChannelReliability *rel)
343 struct MeshReliableMessage *copy;
344 struct MeshReliableMessage *prev;
348 size = ntohs (msg->header.size);
349 mid = ntohl (msg->mid);
351 LOG (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data %u\n", mid);
353 copy = GNUNET_malloc (sizeof (*copy) + size);
356 copy->type = GNUNET_MESSAGE_TYPE_MESH_DATA;
357 memcpy (©[1], msg, size);
361 // FIXME do something better than O(n), although n < 64...
362 // FIXME start from the end (most messages are the latest ones)
363 for (prev = rel->head_recv; NULL != prev; prev = prev->next)
365 LOG (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid);
366 if (GM_is_pid_bigger (prev->mid, mid))
368 LOG (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n");
369 GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv,
374 LOG (GNUNET_ERROR_TYPE_DEBUG, " insert at tail!\n");
375 GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy);
376 LOG (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n");
380 * Add a destination client to a channel, initializing all data structures
381 * in the channel and the client.
383 * @param ch Channel to which add the destination.
384 * @param c Client which to add to the channel.
387 add_destination (struct MeshChannel *ch, struct MeshClient *c)
389 if (NULL != ch->dest)
395 /* Assign local id as destination */
396 ch->lid_dest = GML_get_next_chid (c);
398 /* Store in client's hashmap */
399 GML_channel_add (c, ch->lid_dest, ch);
401 GNUNET_break (NULL == ch->dest_rel);
402 ch->dest_rel = GNUNET_new (struct MeshChannelReliability);
403 ch->dest_rel->ch = ch;
404 ch->dest_rel->expected_delay.rel_value_us = 0;
411 * Set options in a channel, extracted from a bit flag field.
413 * @param ch Channel to set options to.
414 * @param options Bit array in host byte order.
417 channel_set_options (struct MeshChannel *ch, uint32_t options)
419 ch->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
420 GNUNET_YES : GNUNET_NO;
421 ch->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
422 GNUNET_YES : GNUNET_NO;
427 * Get a bit flag field with the options of a channel.
429 * @param ch Channel to get options from.
431 * @return Bit array in host byte order.
434 channel_get_options (struct MeshChannel *ch)
440 options |= GNUNET_MESH_OPTION_NOBUFFER;
442 options |= GNUNET_MESH_OPTION_RELIABLE;
449 * Notify the destination client that a new incoming channel was created.
451 * @param ch Channel that was created.
454 send_client_create (struct MeshChannel *ch)
458 if (NULL == ch->dest)
462 opt |= GNUNET_YES == ch->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0;
463 opt |= GNUNET_YES == ch->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0;
464 GML_send_channel_create (ch->dest, ch->lid_dest, ch->port, opt,
465 GMT_get_destination (ch->t));
471 * Send data to a client.
473 * If the client is ready, send directly, otherwise buffer while listening
477 * @param msg Message.
478 * @param fwd Is this a fwd (root->dest) message?
481 send_client_data (struct MeshChannel *ch,
482 const struct GNUNET_MESH_Data *msg,
487 if (ch->dest_rel->client_ready)
488 GML_send_data (ch->dest, msg, ch->lid_dest);
490 add_buffered_data (msg, ch->dest_rel);
494 if (ch->root_rel->client_ready)
495 GML_send_data (ch->root, msg, ch->lid_root);
497 add_buffered_data (msg, ch->root_rel);
503 * Send a buffered message to the client, for in order delivery or
504 * as result of client ACK.
506 * @param ch Channel on which to empty the message buffer.
507 * @param c Client to send to.
508 * @param fwd Is this to send FWD data?.
511 send_client_buffered_data (struct MeshChannel *ch,
512 struct MeshClient *c,
515 struct MeshReliableMessage *copy;
516 struct MeshChannelReliability *rel;
518 LOG (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n");
519 rel = fwd ? ch->dest_rel : ch->root_rel;
520 if (GNUNET_NO == rel->client_ready)
522 LOG (GNUNET_ERROR_TYPE_DEBUG, "client not ready\n");
526 copy = rel->head_recv;
527 /* We never buffer channel management messages */
530 if (copy->mid == rel->mid_recv || GNUNET_NO == ch->reliable)
532 struct GNUNET_MESH_Data *msg = (struct GNUNET_MESH_Data *) ©[1];
534 LOG (GNUNET_ERROR_TYPE_DEBUG,
535 " have %u! now expecting %u\n",
536 copy->mid, rel->mid_recv + 1);
537 send_client_data (ch, msg, fwd);
540 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
541 LOG (GNUNET_ERROR_TYPE_DEBUG, " COPYFREE RECV %p\n", copy);
546 LOG (GNUNET_ERROR_TYPE_DEBUG,
547 " reliable && don't have %u, next is %u\n",
553 LOG (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n");
558 * Allow a client to send more data.
560 * In case the client was already allowed to send data, do nothing.
563 * @param fwd Is this a FWD ACK? (FWD ACKs are sent to root)
566 send_client_ack (struct MeshChannel *ch, int fwd)
568 struct MeshChannelReliability *rel = fwd ? ch->root_rel : ch->dest_rel;
570 LOG (GNUNET_ERROR_TYPE_DEBUG,
571 " sending %s ack to client on channel %s\n",
572 GM_f2s (fwd), GMCH_2s (ch));
580 if (GNUNET_YES == rel->client_allowed)
582 LOG (GNUNET_ERROR_TYPE_DEBUG, " already allowed\n");
585 rel->client_allowed = GNUNET_YES;
587 GML_send_ack (fwd ? ch->root : ch->dest, fwd ? ch->lid_root : ch->lid_dest);
592 * Notify the root that the destination rejected the channel.
594 * @param ch Rejected channel.
597 send_client_nack (struct MeshChannel *ch)
599 if (NULL == ch->root)
604 GML_send_nack (ch->root, ch->lid_root);
609 * We haven't received an ACK after a certain time: restransmit the message.
611 * @param cls Closure (MeshChannelReliability with the message to restransmit)
612 * @param tc TaskContext.
615 channel_retransmit_message (void *cls,
616 const struct GNUNET_SCHEDULER_TaskContext *tc)
618 struct MeshChannelReliability *rel = cls;
619 struct MeshReliableMessage *copy;
620 struct MeshChannel *ch;
621 struct GNUNET_MESH_Data *payload;
624 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
625 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
629 copy = rel->head_sent;
636 payload = (struct GNUNET_MESH_Data *) ©[1];
637 fwd = (rel == ch->root_rel);
639 /* Message not found in the queue that we are going to use. */
640 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->mid);
642 GMCH_send_prebuilt_message (&payload->header, ch, fwd, copy);
643 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
648 * We haven't received an Channel ACK after a certain time: resend the CREATE.
650 * @param cls Closure (MeshChannelReliability of the channel to recreate)
651 * @param tc TaskContext.
654 channel_recreate (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
656 struct MeshChannelReliability *rel = cls;
658 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
659 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
662 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! RE-CREATE\n");
663 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
665 if (rel == rel->ch->root_rel)
667 send_create (rel->ch);
678 * Message has been sent: start retransmission timer.
680 * @param cls Closure (queue structure).
682 * @param q Queue handler (no longer valid).
683 * @param type Type of message.
684 * @param size Size of the message.
687 ch_message_sent (void *cls,
688 struct MeshTunnel3 *t,
689 struct MeshTunnel3Queue *q,
690 uint16_t type, size_t size)
692 struct MeshChannelQueue *ch_q = cls;
693 struct MeshReliableMessage *copy = ch_q->copy;
694 struct MeshChannelReliability *rel;
698 case GNUNET_MESSAGE_TYPE_MESH_DATA:
699 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! SENT %u %s (c: %p, q: %p)\n",
700 copy->mid, GM_m2s (type), copy, copy->q);
701 GNUNET_assert (ch_q == copy->q);
702 copy->timestamp = GNUNET_TIME_absolute_get ();
704 if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
706 if (0 != rel->expected_delay.rel_value_us)
709 GNUNET_TIME_relative_multiply (rel->expected_delay,
710 MESH_RETRANSMIT_MARGIN);
714 rel->retry_timer = MESH_RETRANSMIT_TIME;
717 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
718 &channel_retransmit_message, rel);
724 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
725 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
727 GNUNET_assert (rel->uniq == ch_q);
730 if (MESH_CHANNEL_READY != rel->ch->state
731 && GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE == type)
733 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == rel->retry_task);
734 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
735 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
736 &channel_recreate, rel);
750 * send a channel create message.
752 * @param ch Channel for which to send.
755 send_create (struct MeshChannel *ch)
757 struct GNUNET_MESH_ChannelCreate msgcc;
759 msgcc.header.size = htons (sizeof (msgcc));
760 msgcc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE);
761 msgcc.chid = htonl (ch->gid);
762 msgcc.port = htonl (ch->port);
763 msgcc.opt = htonl (channel_get_options (ch));
765 GMCH_send_prebuilt_message (&msgcc.header, ch, GNUNET_YES, NULL);
770 * Notify a client that the channel is no longer valid.
772 * @param ch Channel that is destroyed.
773 * @param local_only Should we avoid sending it to other peers?
776 send_destroy (struct MeshChannel *ch, int local_only)
778 struct GNUNET_MESH_ChannelManage msg;
780 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
781 msg.header.size = htons (sizeof (msg));
782 msg.chid = htonl (ch->gid);
784 /* If root is not NULL, notify.
785 * If it's NULL, check lid_root. When a local destroy comes in, root
786 * is set to NULL but lid_root is left untouched. In this case, do nothing,
787 * the client is the one who reuqested the channel to be destroyed.
789 if (NULL != ch->root)
790 GML_send_channel_destroy (ch->root, ch->lid_root);
791 else if (0 == ch->lid_root && GNUNET_NO == local_only)
792 GMCH_send_prebuilt_message (&msg.header, ch, GNUNET_NO, NULL);
794 if (NULL != ch->dest)
795 GML_send_channel_destroy (ch->dest, ch->lid_dest);
796 else if (0 == ch->lid_dest && GNUNET_NO == local_only)
797 GMCH_send_prebuilt_message (&msg.header, ch, GNUNET_YES, NULL);
802 * Destroy all reliable messages queued for a channel,
803 * during a channel destruction.
804 * Frees the reliability structure itself.
806 * @param rel Reliability data for a channel.
809 channel_rel_free_all (struct MeshChannelReliability *rel)
811 struct MeshReliableMessage *copy;
812 struct MeshReliableMessage *next;
817 for (copy = rel->head_recv; NULL != copy; copy = next)
820 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
821 LOG (GNUNET_ERROR_TYPE_DEBUG, " COPYFREE BATCH RECV %p\n", copy);
824 for (copy = rel->head_sent; NULL != copy; copy = next)
827 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
828 LOG (GNUNET_ERROR_TYPE_DEBUG, " COPYFREE BATCH %p\n", copy);
831 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
833 GNUNET_SCHEDULER_cancel (rel->retry_task);
835 if (NULL != rel->uniq)
836 GMT_cancel (rel->uniq->q);
842 * Mark future messages as ACK'd.
844 * @param rel Reliability data.
845 * @param msg DataACK message with a bitfield of future ACK'd messages.
848 channel_rel_free_sent (struct MeshChannelReliability *rel,
849 const struct GNUNET_MESH_DataACK *msg)
851 struct MeshReliableMessage *copy;
852 struct MeshReliableMessage *next;
859 bitfield = msg->futures;
860 mid = ntohl (msg->mid);
861 LOG (GNUNET_ERROR_TYPE_DEBUG,
862 "!!! free_sent_reliable %u %llX\n",
864 LOG (GNUNET_ERROR_TYPE_DEBUG,
865 " rel %p, head %p\n",
866 rel, rel->head_sent);
867 for (i = 0, copy = rel->head_sent;
868 i < 64 && NULL != copy && 0 != bitfield;
871 LOG (GNUNET_ERROR_TYPE_DEBUG,
872 " trying bit %u (mid %u)\n",
875 if (0 == (bitfield & mask))
878 LOG (GNUNET_ERROR_TYPE_DEBUG, " set!\n");
879 /* Bit was set, clear the bit from the bitfield */
882 /* The i-th bit was set. Do we have that copy? */
883 /* Skip copies with mid < target */
884 target = mid + i + 1;
885 LOG (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target);
886 while (NULL != copy && GM_is_pid_bigger (target, copy->mid))
889 /* Did we run out of copies? (previously freed, it's ok) */
892 LOG (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n");
896 /* Did we overshoot the target? (previously freed, it's ok) */
897 if (GM_is_pid_bigger (copy->mid, target))
899 LOG (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid);
903 /* Now copy->mid == target, free it */
905 rel_message_free (copy, GNUNET_YES);
908 LOG (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n");
913 * Destroy a reliable message after it has been acknowledged, either by
914 * direct mid ACK or bitfield. Updates the appropriate data structures and
915 * timers and frees all memory.
917 * @param copy Message that is no longer needed: remote peer got it.
918 * @param update_time Is the timing information relevant?
919 * If this message is ACK in a batch the timing information
920 * is skewed by the retransmission, count only for the
921 * retransmitted message.
924 rel_message_free (struct MeshReliableMessage *copy, int update_time)
926 struct MeshChannelReliability *rel;
927 struct GNUNET_TIME_Relative time;
930 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! Freeing %u\n", copy->mid);
933 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
934 if (0 == rel->expected_delay.rel_value_us)
935 rel->expected_delay = time;
938 rel->expected_delay.rel_value_us *= 7;
939 rel->expected_delay.rel_value_us += time.rel_value_us;
940 rel->expected_delay.rel_value_us /= 8;
942 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! took %s\n",
943 GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO));
944 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
945 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
947 rel->retry_timer = rel->expected_delay;
951 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! batch free, ignoring timing\n");
953 rel->ch->pending_messages--;
954 if (GNUNET_NO != rel->ch->destroy && 0 == rel->ch->pending_messages)
956 struct MeshTunnel3 *t = rel->ch->t;
957 GMCH_destroy (rel->ch);
958 GMT_destroy_if_empty (t);
962 GMT_cancel (copy->q->q);
964 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
965 LOG (GNUNET_ERROR_TYPE_DEBUG, " COPYFREE %p\n", copy);
971 * Confirm we got a channel create.
973 * @param ch The channel to confirm.
974 * @param fwd Should we send a FWD ACK? (going dest->root)
977 channel_send_ack (struct MeshChannel *ch, int fwd)
979 struct GNUNET_MESH_ChannelManage msg;
981 msg.header.size = htons (sizeof (msg));
982 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK);
983 LOG (GNUNET_ERROR_TYPE_DEBUG,
984 " sending channel %s ack for channel %s\n",
985 GM_f2s (fwd), GMCH_2s (ch));
987 msg.chid = htonl (ch->gid);
988 GMCH_send_prebuilt_message (&msg.header, ch, !fwd, NULL);
993 * Notify that a channel create didn't succeed.
995 * @param ch The channel to reject.
998 channel_send_nack (struct MeshChannel *ch)
1000 struct GNUNET_MESH_ChannelManage msg;
1002 msg.header.size = htons (sizeof (msg));
1003 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK);
1004 LOG (GNUNET_ERROR_TYPE_DEBUG,
1005 " sending channel NACK for channel %s\n",
1008 msg.chid = htonl (ch->gid);
1009 GMCH_send_prebuilt_message (&msg.header, ch, GNUNET_NO, NULL);
1014 * Channel was ACK'd by remote peer, mark as ready and cancel retransmission.
1016 * @param ch Channel to mark as ready.
1017 * @param fwd Was the ACK message a FWD ACK? (dest->root, SYNACK)
1020 channel_confirm (struct MeshChannel *ch, int fwd)
1022 struct MeshChannelReliability *rel;
1024 LOG (GNUNET_ERROR_TYPE_DEBUG,
1025 " channel confirm %s %s:%X\n",
1026 GM_f2s (fwd), GMT_2s (ch->t), ch->gid);
1027 ch->state = MESH_CHANNEL_READY;
1029 rel = fwd ? ch->root_rel : ch->dest_rel;
1030 rel->client_ready = GNUNET_YES;
1031 rel->expected_delay = rel->retry_timer;
1032 send_client_ack (ch, fwd);
1034 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
1036 GNUNET_SCHEDULER_cancel (rel->retry_task);
1037 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
1039 else if (NULL != rel->uniq)
1041 GMT_cancel (rel->uniq->q);
1042 /* ch_sent_message will free and NULL uniq */
1046 /* We SHOULD have been trying to retransmit this! */
1050 /* In case of a FWD ACK (SYNACK) send a BCK ACK (ACK). */
1051 if (GNUNET_YES == fwd)
1052 channel_send_ack (ch, GNUNET_NO);
1057 * Save a copy to retransmit in case it gets lost.
1059 * Initializes all needed callbacks and timers.
1061 * @param ch Channel this message goes on.
1062 * @param msg Message to copy.
1063 * @param fwd Is this fwd traffic?
1065 static struct MeshReliableMessage *
1066 channel_save_copy (struct MeshChannel *ch,
1067 const struct GNUNET_MessageHeader *msg,
1070 struct MeshChannelReliability *rel;
1071 struct MeshReliableMessage *copy;
1076 rel = fwd ? ch->root_rel : ch->dest_rel;
1077 mid = rel->mid_send - 1;
1078 type = ntohs (msg->type);
1079 size = ntohs (msg->size);
1081 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! SAVE %u %s\n", mid, GM_m2s (type));
1082 copy = GNUNET_malloc (sizeof (struct MeshReliableMessage) + size);
1083 LOG (GNUNET_ERROR_TYPE_DEBUG, " at %p\n", copy);
1087 memcpy (©[1], msg, size);
1088 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
1089 ch->pending_messages++;
1096 * Create a new channel.
1098 * @param t Tunnel this channel is in.
1099 * @param owner Client that owns the channel, NULL for foreign channels.
1100 * @param lid_root Local ID for root client.
1102 * @return A new initialized channel. NULL on error.
1104 static struct MeshChannel *
1105 channel_new (struct MeshTunnel3 *t,
1106 struct MeshClient *owner,
1107 MESH_ChannelNumber lid_root)
1109 struct MeshChannel *ch;
1111 ch = GNUNET_new (struct MeshChannel);
1113 ch->lid_root = lid_root;
1116 GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
1120 ch->gid = GMT_get_next_chid (t);
1121 GML_channel_add (owner, lid_root, ch);
1123 GMT_add_channel (t, ch);
1130 * Test if the channel is loopback: both root and dest are on the local peer.
1132 * @param ch Channel to test.
1134 * @return #GNUNET_YES if channel is loopback, #NGUNET_NO otherwise.
1137 is_loopback (const struct MeshChannel *ch)
1140 return GMT_is_loopback (ch->t);
1142 return (NULL != ch->root && NULL != ch->dest);
1147 * Handle a loopback message: call the appropriate handler for the message type.
1149 * @param ch Channel this message is on.
1150 * @param msgh Message header.
1151 * @param fwd Is this FWD traffic?
1154 handle_loopback (struct MeshChannel *ch,
1155 const struct GNUNET_MessageHeader *msgh,
1160 type = ntohs (msgh->type);
1161 LOG (GNUNET_ERROR_TYPE_DEBUG,
1162 "Loopback %s %s message!\n",
1163 GM_f2s (fwd), GM_m2s (type));
1167 case GNUNET_MESSAGE_TYPE_MESH_DATA:
1168 /* Don't send hop ACK, wait for client to ACK */
1169 GMCH_handle_data (ch, (struct GNUNET_MESH_Data *) msgh, fwd);
1172 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
1173 GMCH_handle_data_ack (ch, (struct GNUNET_MESH_DataACK *) msgh, fwd);
1176 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1177 GMCH_handle_create (ch->t,
1178 (struct GNUNET_MESH_ChannelCreate *) msgh);
1181 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK:
1182 GMCH_handle_ack (ch,
1183 (struct GNUNET_MESH_ChannelManage *) msgh,
1187 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_NACK:
1188 GMCH_handle_nack (ch);
1191 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1192 GMCH_handle_destroy (ch,
1193 (struct GNUNET_MESH_ChannelManage *) msgh,
1198 GNUNET_break_op (0);
1199 LOG (GNUNET_ERROR_TYPE_DEBUG,
1200 "end-to-end message not known (%u)\n",
1201 ntohs (msgh->type));
1207 /******************************************************************************/
1208 /******************************** API ***********************************/
1209 /******************************************************************************/
1212 * Destroy a channel and free all resources.
1214 * @param ch Channel to destroy.
1217 GMCH_destroy (struct MeshChannel *ch)
1219 struct MeshClient *c;
1224 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying channel %s:%u\n",
1225 GMT_2s (ch->t), ch->gid);
1231 GML_channel_remove (c, ch->lid_root, ch);
1237 GML_channel_remove (c, ch->lid_dest, ch);
1240 channel_rel_free_all (ch->root_rel);
1241 channel_rel_free_all (ch->dest_rel);
1243 GMT_remove_channel (ch->t, ch);
1244 GNUNET_STATISTICS_update (stats, "# channels", -1, GNUNET_NO);
1253 * @param ch Channel.
1258 GMCH_get_id (const struct MeshChannel *ch)
1265 * Get the channel tunnel.
1267 * @param ch Channel to get the tunnel from.
1269 * @return tunnel of the channel.
1271 struct MeshTunnel3 *
1272 GMCH_get_tunnel (const struct MeshChannel *ch)
1279 * Get free buffer space towards the client on a specific channel.
1281 * @param ch Channel.
1282 * @param fwd Is query about FWD traffic?
1284 * @return Free buffer space [0 - 64]
1287 GMCH_get_buffer (struct MeshChannel *ch, int fwd)
1289 struct MeshChannelReliability *rel;
1291 rel = fwd ? ch->dest_rel : ch->root_rel;
1293 /* If rel is NULL it means that the end is not yet created,
1294 * most probably is a loopback channel at the point of sending
1295 * the ChannelCreate to itself.
1300 return (64 - rel->n_recv);
1305 * Get flow control status of end point: is client allow to send?
1307 * @param ch Channel.
1308 * @param fwd Is query about FWD traffic? (Request root status).
1310 * @return #GNUNET_YES if client is allowed to send us data.
1313 GMCH_get_allowed (struct MeshChannel *ch, int fwd)
1315 struct MeshChannelReliability *rel;
1317 rel = fwd ? ch->root_rel : ch->dest_rel;
1321 /* Probably shutting down: root/dest NULL'ed to mark disconnection */
1322 GNUNET_break (GNUNET_NO != ch->destroy);
1326 return rel->client_allowed;
1331 * Is the root client for this channel on this peer?
1333 * @param ch Channel.
1334 * @param fwd Is this for fwd traffic?
1336 * @return #GNUNET_YES in case it is.
1339 GMCH_is_origin (struct MeshChannel *ch, int fwd)
1341 struct MeshClient *c;
1343 c = fwd ? ch->root : ch->dest;
1349 * Is the destination client for this channel on this peer?
1351 * @param ch Channel.
1352 * @param fwd Is this for fwd traffic?
1354 * @return #GNUNET_YES in case it is.
1357 GMCH_is_terminal (struct MeshChannel *ch, int fwd)
1359 struct MeshClient *c;
1361 c = fwd ? ch->dest : ch->root;
1367 * Send an end-to-end ACK message for the most recent in-sequence payload.
1369 * If channel is not reliable, do nothing.
1371 * @param ch Channel this is about.
1372 * @param fwd Is for FWD traffic? (ACK dest->owner)
1375 GMCH_send_data_ack (struct MeshChannel *ch, int fwd)
1377 struct GNUNET_MESH_DataACK msg;
1378 struct MeshChannelReliability *rel;
1379 struct MeshReliableMessage *copy;
1384 if (GNUNET_NO == ch->reliable)
1388 rel = fwd ? ch->dest_rel : ch->root_rel;
1389 ack = rel->mid_recv - 1;
1390 LOG (GNUNET_ERROR_TYPE_DEBUG,
1391 " !! Send DATA_ACK for %u\n",
1394 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_DATA_ACK);
1395 msg.header.size = htons (sizeof (msg));
1396 msg.chid = htonl (ch->gid);
1398 for (copy = rel->head_recv; NULL != copy; copy = copy->next)
1400 if (copy->type != GNUNET_MESSAGE_TYPE_MESH_DATA)
1402 LOG (GNUNET_ERROR_TYPE_DEBUG,
1403 "!! Type %s, expected DATA\n",
1404 GM_m2s (copy->type));
1407 if (copy->mid == ack + 1)
1412 delta = copy->mid - (ack + 1);
1415 mask = 0x1LL << delta;
1416 msg.futures |= mask;
1417 LOG (GNUNET_ERROR_TYPE_DEBUG,
1418 " !! setting bit for %u (delta %u) (%llX) -> %llX\n",
1419 copy->mid, delta, mask, msg.futures);
1421 msg.mid = htonl (ack);
1422 LOG (GNUNET_ERROR_TYPE_DEBUG,
1423 "!!! ACK for %u, futures %llX\n",
1426 GMCH_send_prebuilt_message (&msg.header, ch, !fwd, NULL);
1427 LOG (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n");
1432 * Allow a client to send us more data, in case it was choked.
1434 * @param ch Channel.
1435 * @param fwd Is this about FWD traffic? (Root client).
1438 GMCH_allow_client (struct MeshChannel *ch, int fwd)
1440 struct MeshChannelReliability *rel;
1441 unsigned int buffer;
1443 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMCH allow\n");
1445 if (MESH_CHANNEL_READY != ch->state)
1447 LOG (GNUNET_ERROR_TYPE_DEBUG, " channel not ready yet!\n");
1451 if (GNUNET_YES == ch->reliable)
1453 rel = fwd ? ch->root_rel : ch->dest_rel;
1456 GNUNET_break (GNUNET_NO != ch->destroy);
1459 if (NULL != rel->head_sent && 64 <= rel->mid_send - rel->head_sent->mid)
1461 LOG (GNUNET_ERROR_TYPE_DEBUG, " too big MID gap! Wait for ACK.\n");
1466 if (is_loopback (ch))
1467 buffer = GMCH_get_buffer (ch, fwd);
1469 buffer = GMT_get_connections_buffer (ch->t);
1473 LOG (GNUNET_ERROR_TYPE_DEBUG, " no buffer space.\n");
1477 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space %u, allowing\n", buffer);
1478 send_client_ack (ch, fwd);
1485 * @param ch Channel.
1488 GMCH_debug (struct MeshChannel *ch)
1492 LOG (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CHANNEL ***\n");
1495 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %s:%X (%p)\n",
1496 GMT_2s (ch->t), ch->gid, ch);
1497 LOG (GNUNET_ERROR_TYPE_DEBUG, " root %p/%p\n",
1498 ch->root, ch->root_rel);
1499 if (NULL != ch->root)
1501 LOG (GNUNET_ERROR_TYPE_DEBUG, " cli %s\n", GML_2s (ch->root));
1502 LOG (GNUNET_ERROR_TYPE_DEBUG, " ready %s\n",
1503 ch->root_rel->client_ready ? "YES" : "NO");
1504 LOG (GNUNET_ERROR_TYPE_DEBUG, " id %X\n", ch->lid_root);
1506 LOG (GNUNET_ERROR_TYPE_DEBUG, " dest %p/%p\n",
1507 ch->dest, ch->dest_rel);
1508 if (NULL != ch->dest)
1510 LOG (GNUNET_ERROR_TYPE_DEBUG, " cli %s\n", GML_2s (ch->dest));
1511 LOG (GNUNET_ERROR_TYPE_DEBUG, " ready %s\n",
1512 ch->dest_rel->client_ready ? "YES" : "NO");
1513 LOG (GNUNET_ERROR_TYPE_DEBUG, " id %X\n", ch->lid_dest);
1519 * Handle an ACK given by a client.
1521 * Mark client as ready and send him any buffered data we could have for him.
1523 * @param ch Channel.
1524 * @param fwd Is this a "FWD ACK"? (FWD ACKs are sent by dest and go BCK)
1527 GMCH_handle_local_ack (struct MeshChannel *ch, int fwd)
1529 struct MeshChannelReliability *rel;
1530 struct MeshClient *c;
1532 rel = fwd ? ch->dest_rel : ch->root_rel;
1533 c = fwd ? ch->dest : ch->root;
1535 rel->client_ready = GNUNET_YES;
1536 send_client_buffered_data (ch, c, fwd);
1537 if (is_loopback (ch))
1539 unsigned int buffer;
1541 buffer = GMCH_get_buffer (ch, fwd);
1543 GMCH_allow_client (ch, fwd);
1547 GMT_send_connection_acks (ch->t);
1552 * Handle data given by a client.
1554 * Check whether the client is allowed to send in this tunnel, save if channel
1555 * is reliable and send an ACK to the client if there is still buffer space
1558 * @param ch Channel.
1559 * @param c Client which sent the data.
1560 * @param message Message.
1561 * @param fwd Is this a FWD data?
1563 * @return GNUNET_OK if everything goes well, GNUNET_SYSERR in case of en error.
1566 GMCH_handle_local_data (struct MeshChannel *ch,
1567 struct MeshClient *c,
1568 struct GNUNET_MessageHeader *message,
1571 struct MeshChannelReliability *rel;
1572 struct GNUNET_MESH_Data *payload;
1573 size_t size = ntohs (message->size);
1574 uint16_t p2p_size = sizeof(struct GNUNET_MESH_Data) + size;
1575 unsigned char cbuf[p2p_size];
1577 /* Is the client in the channel? */
1584 GNUNET_break_op (0);
1585 return GNUNET_SYSERR;
1588 rel = fwd ? ch->root_rel : ch->dest_rel;
1590 if (GNUNET_NO == rel->client_allowed)
1592 GNUNET_break_op (0);
1593 return GNUNET_SYSERR;
1596 rel->client_allowed = GNUNET_NO;
1598 /* Ok, everything is correct, send the message. */
1599 payload = (struct GNUNET_MESH_Data *) cbuf;
1600 payload->mid = htonl (rel->mid_send);
1602 memcpy (&payload[1], message, size);
1603 payload->header.size = htons (p2p_size);
1604 payload->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_DATA);
1605 payload->chid = htonl (ch->gid);
1606 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
1607 GMCH_send_prebuilt_message (&payload->header, ch, fwd, NULL);
1609 if (is_loopback (ch))
1611 if (GMCH_get_buffer (ch, fwd) > 0)
1612 send_client_ack (ch, fwd);
1617 if (GMT_get_connections_buffer (ch->t) > 0)
1619 send_client_ack (ch, fwd);
1627 * Handle a channel destroy requested by a client.
1629 * Destroy the channel and the tunnel in case this was the last channel.
1631 * @param ch Channel.
1632 * @param c Client that requested the destruction (to avoid notifying him).
1633 * @param is_root Is the request coming from root?
1636 GMCH_handle_local_destroy (struct MeshChannel *ch,
1637 struct MeshClient *c,
1640 struct MeshTunnel3 *t;
1642 ch->destroy = GNUNET_YES;
1643 /* Cleanup after the tunnel */
1644 if (GNUNET_NO == is_root && c == ch->dest)
1646 LOG (GNUNET_ERROR_TYPE_DEBUG, " Client %s is destination.\n", GML_2s (c));
1647 GML_client_delete_channel (c, ch, ch->lid_dest);
1650 if (GNUNET_YES == is_root && c == ch->root)
1652 LOG (GNUNET_ERROR_TYPE_DEBUG, " Client %s is owner.\n", GML_2s (c));
1653 GML_client_delete_channel (c, ch, ch->lid_root);
1658 send_destroy (ch, GNUNET_NO);
1659 if (0 == ch->pending_messages)
1662 GMT_destroy_if_empty (t);
1668 * Handle a channel create requested by a client.
1670 * Create the channel and the tunnel in case this was the first0 channel.
1672 * @param c Client that requested the creation (will be the root).
1673 * @param msg Create Channel message.
1675 * @return GNUNET_OK if everything went fine, GNUNET_SYSERR otherwise.
1678 GMCH_handle_local_create (struct MeshClient *c,
1679 struct GNUNET_MESH_ChannelMessage *msg)
1681 struct MeshChannel *ch;
1682 struct MeshTunnel3 *t;
1683 struct MeshPeer *peer;
1684 MESH_ChannelNumber chid;
1686 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n",
1687 GNUNET_i2s (&msg->peer), ntohl (msg->port));
1688 chid = ntohl (msg->channel_id);
1690 /* Sanity check for duplicate channel IDs */
1691 if (NULL != GML_channel_get (c, chid))
1694 return GNUNET_SYSERR;
1697 peer = GMP_get (&msg->peer);
1698 GMP_add_tunnel (peer);
1699 t = GMP_get_tunnel (peer);
1701 if (GMP_get_short_id (peer) == myid)
1703 GMT_change_cstate (t, MESH_TUNNEL3_READY);
1710 /* Create channel */
1711 ch = channel_new (t, c, chid);
1715 return GNUNET_SYSERR;
1717 ch->port = ntohl (msg->port);
1718 channel_set_options (ch, ntohl (msg->opt));
1720 /* In unreliable channels, we'll use the DLL to buffer BCK data */
1721 ch->root_rel = GNUNET_new (struct MeshChannelReliability);
1722 ch->root_rel->ch = ch;
1723 ch->root_rel->retry_timer = GNUNET_TIME_UNIT_SECONDS;
1724 ch->root_rel->expected_delay.rel_value_us = 0;
1726 LOG (GNUNET_ERROR_TYPE_DEBUG, "CREATED CHANNEL %s\n", GMCH_2s (ch));
1735 * Handler for mesh network payload traffic.
1737 * @param ch Channel for the message.
1738 * @param msg Unencryted data message.
1739 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1740 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1741 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1742 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1745 GMCH_handle_data (struct MeshChannel *ch,
1746 const struct GNUNET_MESH_Data *msg,
1749 struct MeshChannelReliability *rel;
1750 struct MeshClient *c;
1753 /* If this is a remote (non-loopback) channel, find 'fwd'. */
1754 if (GNUNET_SYSERR == fwd)
1756 if (is_loopback (ch))
1758 /* It is a loopback channel after all... */
1762 fwd = (NULL != ch->dest) ? GNUNET_YES : GNUNET_NO;
1765 /* Initialize FWD/BCK data */
1766 c = fwd ? ch->dest : ch->root;
1767 rel = fwd ? ch->dest_rel : ch->root_rel;
1775 GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
1777 mid = ntohl (msg->mid);
1778 LOG (GNUNET_ERROR_TYPE_DEBUG, "!! got mid %u\n", mid);
1780 if (GNUNET_NO == ch->reliable ||
1781 ( !GM_is_pid_bigger (rel->mid_recv, mid) &&
1782 GM_is_pid_bigger (rel->mid_recv + 64, mid) ) )
1784 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! RECV %u\n", mid);
1785 if (GNUNET_YES == ch->reliable)
1787 /* Is this the exact next expected messasge? */
1788 if (mid == rel->mid_recv)
1790 LOG (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
1792 send_client_data (ch, msg, fwd);
1796 LOG (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
1797 add_buffered_data (msg, rel);
1802 /* Tunnel is unreliable: send to clients directly */
1803 /* FIXME: accept Out Of Order traffic */
1804 rel->mid_recv = mid + 1;
1805 send_client_data (ch, msg, fwd);
1810 GNUNET_break_op (GM_is_pid_bigger (rel->mid_recv, mid));
1811 LOG (GNUNET_ERROR_TYPE_DEBUG,
1812 " !!! MID %u not expected (%u - %u), dropping!\n",
1813 mid, rel->mid_recv, rel->mid_recv + 63);
1816 GMCH_send_data_ack (ch, fwd);
1821 * Handler for mesh network traffic end-to-end ACKs.
1823 * @param ch Channel on which we got this message.
1824 * @param msg Data message.
1825 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1826 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1827 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1828 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1831 GMCH_handle_data_ack (struct MeshChannel *ch,
1832 const struct GNUNET_MESH_DataACK *msg,
1835 struct MeshChannelReliability *rel;
1836 struct MeshReliableMessage *copy;
1837 struct MeshReliableMessage *next;
1841 /* If this is a remote (non-loopback) channel, find 'fwd'. */
1842 if (GNUNET_SYSERR == fwd)
1844 if (is_loopback (ch))
1846 /* It is a loopback channel after all... */
1850 /* Inverted: if message came 'FWD' is a 'BCK ACK'. */
1851 fwd = (NULL != ch->dest) ? GNUNET_NO : GNUNET_YES;
1854 ack = ntohl (msg->mid);
1855 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! %s ACK %u\n",
1856 (GNUNET_YES == fwd) ? "FWD" : "BCK", ack);
1858 if (GNUNET_YES == fwd)
1868 GNUNET_break_op (0);
1872 /* Free ACK'd copies: no need to retransmit those anymore */
1873 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
1875 if (GM_is_pid_bigger (copy->mid, ack))
1877 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid);
1878 channel_rel_free_sent (rel, msg);
1882 LOG (GNUNET_ERROR_TYPE_DEBUG, " !! id %u\n", copy->mid);
1884 rel_message_free (copy, GNUNET_YES);
1887 /* ACK client if needed */
1888 GMCH_allow_client (ch, fwd);
1890 /* If some message was free'd, update the retransmission delay */
1891 if (GNUNET_YES == work)
1893 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
1895 GNUNET_SCHEDULER_cancel (rel->retry_task);
1896 if (NULL != rel->head_sent && NULL == rel->head_sent->q)
1898 struct GNUNET_TIME_Absolute new_target;
1899 struct GNUNET_TIME_Relative delay;
1901 delay = GNUNET_TIME_relative_multiply (rel->retry_timer,
1902 MESH_RETRANSMIT_MARGIN);
1903 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
1905 delay = GNUNET_TIME_absolute_get_remaining (new_target);
1907 GNUNET_SCHEDULER_add_delayed (delay,
1908 &channel_retransmit_message,
1911 else /* either no more traffic to ack or traffic has just been queued */
1913 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
1916 else /* work was done but no task was pending? shouldn't happen! */
1925 * Handler for channel create messages.
1927 * Does not have fwd parameter because it's always 'FWD': channel is incoming.
1929 * @param t Tunnel this channel will be in.
1930 * @param msg Channel crate message.
1932 struct MeshChannel *
1933 GMCH_handle_create (struct MeshTunnel3 *t,
1934 const struct GNUNET_MESH_ChannelCreate *msg)
1936 MESH_ChannelNumber chid;
1937 struct MeshChannel *ch;
1938 struct MeshClient *c;
1940 chid = ntohl (msg->chid);
1942 ch = GMT_get_channel (t, chid);
1945 /* Create channel */
1946 ch = channel_new (t, NULL, 0);
1949 channel_set_options (ch, ntohl (msg->opt));
1951 /* Find a destination client */
1952 ch->port = ntohl (msg->port);
1953 LOG (GNUNET_ERROR_TYPE_DEBUG, " port %u\n", ch->port);
1954 c = GML_client_get_by_port (ch->port);
1957 /* TODO send reject */
1958 LOG (GNUNET_ERROR_TYPE_DEBUG, " no client has port registered\n");
1959 if (is_loopback (ch))
1961 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback: destroy on handler\n");
1962 channel_send_nack (ch);
1966 LOG (GNUNET_ERROR_TYPE_DEBUG, " not loopback: destroy now\n");
1967 channel_send_nack (ch);
1974 LOG (GNUNET_ERROR_TYPE_DEBUG, " client %p has port registered\n", c);
1977 add_destination (ch, c);
1978 if (GNUNET_YES == ch->reliable)
1979 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
1981 LOG (GNUNET_ERROR_TYPE_DEBUG, "!!! Not Reliable\n");
1983 send_client_create (ch);
1984 channel_send_ack (ch, GNUNET_YES);
1991 * Handler for channel NACK messages.
1993 * NACK messages always go dest -> root, no need for 'fwd' or 'msg' parameter.
1995 * @param ch Channel.
1998 GMCH_handle_nack (struct MeshChannel *ch)
2000 send_client_nack (ch);
2006 * Handler for channel ack messages.
2008 * @param ch Channel.
2009 * @param msg Message.
2010 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2011 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2012 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2013 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2016 GMCH_handle_ack (struct MeshChannel *ch,
2017 const struct GNUNET_MESH_ChannelManage *msg,
2020 /* If this is a remote (non-loopback) channel, find 'fwd'. */
2021 if (GNUNET_SYSERR == fwd)
2023 if (is_loopback (ch))
2025 /* It is a loopback channel after all... */
2029 fwd = (NULL != ch->dest) ? GNUNET_YES : GNUNET_NO;
2032 channel_confirm (ch, !fwd);
2037 * Handler for channel destroy messages.
2039 * @param ch Channel to be destroyed of.
2040 * @param msg 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)
2047 GMCH_handle_destroy (struct MeshChannel *ch,
2048 const struct GNUNET_MESH_ChannelManage *msg,
2051 struct MeshTunnel3 *t;
2053 /* If this is a remote (non-loopback) channel, find 'fwd'. */
2054 if (GNUNET_SYSERR == fwd)
2056 if (is_loopback (ch))
2058 /* It is a loopback channel after all... */
2062 fwd = (NULL != ch->dest) ? GNUNET_YES : GNUNET_NO;
2066 if ( (fwd && NULL == ch->dest) || (!fwd && NULL == ch->root) )
2068 /* Not for us (don't destroy twice a half-open loopback channel) */
2073 send_destroy (ch, GNUNET_YES);
2075 GMT_destroy_if_empty (t);
2080 * Sends an already built message on a channel.
2082 * If the channel is on a loopback tunnel, notifies the appropriate destination
2085 * On a normal channel passes the message to the tunnel for encryption and
2086 * sending on a connection.
2088 * This function DOES NOT save the message for retransmission.
2090 * @param message Message to send. Function makes a copy of it.
2091 * @param ch Channel on which this message is transmitted.
2092 * @param fwd Is this a fwd message?
2093 * @param existing_copy This is a retransmission, don't save a copy.
2096 GMCH_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2097 struct MeshChannel *ch, int fwd,
2098 void *existing_copy)
2100 struct MeshChannelQueue *q;
2103 type = ntohs (message->type);
2104 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMCH Send %s %s on channel %s\n",
2105 GM_f2s (fwd), GM_m2s (type),
2108 if (GMT_is_loopback (ch->t))
2110 handle_loopback (ch, message, fwd);
2116 case GNUNET_MESSAGE_TYPE_MESH_DATA:
2118 if (GNUNET_YES == ch->reliable)
2120 q = GNUNET_new (struct MeshChannelQueue);
2122 if (NULL == existing_copy)
2123 q->copy = channel_save_copy (ch, message, fwd);
2126 q->copy = (struct MeshReliableMessage *) existing_copy;
2127 if (NULL != q->copy->q)
2129 /* Last retransmission was queued but not yet sent!
2130 * This retransmission was scheduled by a ch_message_sent which
2131 * followed a very fast RTT, so the tiny delay made the
2132 * retransmission function to execute before the previous
2133 * retransmitted message even had a chance to leave the peer.
2134 * Cancel this message and wait until the pending
2135 * retransmission leaves the peer and ch_message_sent starts
2136 * the timer for the next one.
2141 LOG (GNUNET_ERROR_TYPE_DEBUG,
2142 " using existing copy: %p {r:%p q:%p t:%u}\n",
2144 q->copy->rel, q->copy->q, q->copy->type);
2146 LOG (GNUNET_ERROR_TYPE_DEBUG, " new q: %p\n", q);
2148 q->q = GMT_send_prebuilt_message (message, ch->t, ch,
2149 fwd, NULL != existing_copy,
2150 &ch_message_sent, q);
2151 /* q itself is stored in copy */
2155 GNUNET_break (NULL == GMT_send_prebuilt_message (message, ch->t, ch,
2162 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
2163 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
2164 q = GNUNET_new (struct MeshChannelQueue);
2166 q->rel = fwd ? ch->root_rel : ch->dest_rel;
2167 if (NULL != q->rel->uniq)
2169 GMT_cancel (q->rel->uniq->q);
2170 /* ch_message_sent is called, freeing and NULLing uniq */
2172 q->q = GMT_send_prebuilt_message (message, ch->t, ch,
2174 &ch_message_sent, q);
2180 GNUNET_break (NULL == GMT_send_prebuilt_message (message, ch->t, ch,
2188 * Get the static string for identification of the channel.
2190 * @param ch Channel.
2192 * @return Static string with the channel IDs.
2195 GMCH_2s (const struct MeshChannel *ch)
2197 static char buf[64];
2200 return "(NULL Channel)";
2202 sprintf (buf, "%s:%u gid:%X (%X / %X)",
2203 GMT_2s (ch->t), ch->port, ch->gid, ch->lid_root, ch->lid_dest);